patch-2.1.40 linux/drivers/scsi/53c7xx.c
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- Lines: 6108
- Date:
Sun May 18 17:10:37 1997
- Orig file:
v2.1.39/linux/drivers/scsi/53c7xx.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.1.39/linux/drivers/scsi/53c7xx.c linux/drivers/scsi/53c7xx.c
@@ -0,0 +1,6107 @@
+/*
+ * 53c710 driver. Modified from Drew Eckhardts driver
+ * for 53c810 by Richard Hirst [richard@sleepie.demon.co.uk]
+ * Check out PERM_OPTIONS and EXPECTED_CLOCK, which may be defined in the
+ * relevant machine specific file (eg. mvme166.[ch], amiga7xx.[ch]).
+ * There are also currently some defines at the top of 53c7xx.scr.
+ * The chip type is #defined in script_asm.pl, as well as the Makefile.
+ * Host scsi ID expected to be 7 - see NCR53c7x0_init().
+ *
+ * I have removed the PCI code and some of the 53c8xx specific code -
+ * simply to make this file smaller and easier to manage.
+ *
+ * MVME166 issues:
+ * Problems trying to read any chip registers in NCR53c7x0_init(), as they
+ * may never have been set by 166Bug (eg. If kernel has come in over tftp).
+ */
+
+/*
+ * Adapted for Linux/m68k Amiga platforms for the A4000T/A4091 and
+ * WarpEngine SCSI controllers.
+ * By Alan Hourihane <alanh@fairlite.demon.co.uk>
+ * Thanks to Richard Hirst for making it possible with the MVME additions
+ */
+
+/*
+ * 53c710 rev 0 doesn't support add with carry. Rev 1 and 2 does. To
+ * overcome this problem you can define FORCE_DSA_ALIGNMENT, which ensures
+ * that the DSA address is always xxxxxx00. If disconnection is not allowed,
+ * then the script only ever tries to add small (< 256) positive offsets to
+ * DSA, so lack of carry isn't a problem. FORCE_DSA_ALIGNMENT can, of course,
+ * be defined for all chip revisions at a small cost in memory usage.
+ */
+
+#define FORCE_DSA_ALIGNMENT
+
+/*
+ * Selection timer does not always work on the 53c710, depending on the
+ * timing at the last disconnect, if this is a problem for you, try
+ * using validids as detailed below.
+ *
+ * Options for the NCR7xx driver
+ *
+ * nosync:0 - disables synchronous negotiation
+ * nodisconnect:0 - disables disconnection
+ * validids:0x?? - Bitmask field that disallows certain ID's.
+ * - e.g. 0x03 allows ID 0,1
+ * - 0x1F allows ID 0,1,2,3,4
+ */
+
+/*
+ * PERM_OPTIONS are driver options which will be enabled for all NCR boards
+ * in the system at driver initialization time.
+ *
+ * Don't THINK about touching these in PERM_OPTIONS :
+ * OPTION_MEMORY_MAPPED
+ * 680x0 doesn't have an IO map!
+ *
+ * OPTION_DEBUG_TEST1
+ * Test 1 does bus mastering and interrupt tests, which will help weed
+ * out brain damaged main boards.
+ *
+ * Other PERM_OPTIONS settings are listed below. Note the actual options
+ * required are set in the relevant file (mvme166.c, amiga7xx.c, etc):
+ *
+ * OPTION_NO_ASYNC
+ * Don't negotiate for asynchronous transfers on the first command
+ * when OPTION_ALWAYS_SYNCHRONOUS is set. Useful for dain bramaged
+ * devices which do something bad rather than sending a MESSAGE
+ * REJECT back to us like they should if they can't cope.
+ *
+ * OPTION_SYNCHRONOUS
+ * Enable support for synchronous transfers. Target negotiated
+ * synchronous transfers will be responded to. To initiate
+ * a synchronous transfer request, call
+ *
+ * request_synchronous (hostno, target)
+ *
+ * from within KGDB.
+ *
+ * OPTION_ALWAYS_SYNCHRONOUS
+ * Negotiate for synchronous transfers with every target after
+ * driver initialization or a SCSI bus reset. This is a bit dangerous,
+ * since there are some dain bramaged SCSI devices which will accept
+ * SDTR messages but keep talking asynchronously.
+ *
+ * OPTION_DISCONNECT
+ * Enable support for disconnect/reconnect. To change the
+ * default setting on a given host adapter, call
+ *
+ * request_disconnect (hostno, allow)
+ *
+ * where allow is non-zero to allow, 0 to disallow.
+ *
+ * If you really want to run 10MHz FAST SCSI-II transfers, you should
+ * know that the NCR driver currently ignores parity information. Most
+ * systems do 5MHz SCSI fine. I've seen a lot that have problems faster
+ * than 8MHz. To play it safe, we only request 5MHz transfers.
+ *
+ * If you'd rather get 10MHz transfers, edit sdtr_message and change
+ * the fourth byte from 50 to 25.
+ */
+
+#include <linux/config.h>
+
+/*
+ * Sponsored by
+ * iX Multiuser Multitasking Magazine
+ * Hannover, Germany
+ * hm@ix.de
+ *
+ * Copyright 1993, 1994, 1995 Drew Eckhardt
+ * Visionary Computing
+ * (Unix and Linux consulting and custom programming)
+ * drew@PoohSticks.ORG
+ * +1 (303) 786-7975
+ *
+ * TolerANT and SCSI SCRIPTS are registered trademarks of NCR Corporation.
+ *
+ * For more information, please consult
+ *
+ * NCR53C810
+ * SCSI I/O Processor
+ * Programmer's Guide
+ *
+ * NCR 53C810
+ * PCI-SCSI I/O Processor
+ * Data Manual
+ *
+ * NCR 53C810/53C820
+ * PCI-SCSI I/O Processor Design In Guide
+ *
+ * For literature on Symbios Logic Inc. formerly NCR, SCSI,
+ * and Communication products please call (800) 334-5454 or
+ * (719) 536-3300.
+ *
+ * PCI BIOS Specification Revision
+ * PCI Local Bus Specification
+ * PCI System Design Guide
+ *
+ * PCI Special Interest Group
+ * M/S HF3-15A
+ * 5200 N.E. Elam Young Parkway
+ * Hillsboro, Oregon 97124-6497
+ * +1 (503) 696-2000
+ * +1 (800) 433-5177
+ */
+
+/*
+ * Design issues :
+ * The cumulative latency needed to propagate a read/write request
+ * through the file system, buffer cache, driver stacks, SCSI host, and
+ * SCSI device is ultimately the limiting factor in throughput once we
+ * have a sufficiently fast host adapter.
+ *
+ * So, to maximize performance we want to keep the ratio of latency to data
+ * transfer time to a minimum by
+ * 1. Minimizing the total number of commands sent (typical command latency
+ * including drive and bus mastering host overhead is as high as 4.5ms)
+ * to transfer a given amount of data.
+ *
+ * This is accomplished by placing no arbitrary limit on the number
+ * of scatter/gather buffers supported, since we can transfer 1K
+ * per scatter/gather buffer without Eric's cluster patches,
+ * 4K with.
+ *
+ * 2. Minimizing the number of fatal interrupts serviced, since
+ * fatal interrupts halt the SCSI I/O processor. Basically,
+ * this means offloading the practical maximum amount of processing
+ * to the SCSI chip.
+ *
+ * On the NCR53c810/820/720, this is accomplished by using
+ * interrupt-on-the-fly signals when commands complete,
+ * and only handling fatal errors and SDTR / WDTR messages
+ * in the host code.
+ *
+ * On the NCR53c710, interrupts are generated as on the NCR53c8x0,
+ * only the lack of a interrupt-on-the-fly facility complicates
+ * things. Also, SCSI ID registers and commands are
+ * bit fielded rather than binary encoded.
+ *
+ * On the NCR53c700 and NCR53c700-66, operations that are done via
+ * indirect, table mode on the more advanced chips must be
+ * replaced by calls through a jump table which
+ * acts as a surrogate for the DSA. Unfortunately, this
+ * will mean that we must service an interrupt for each
+ * disconnect/reconnect.
+ *
+ * 3. Eliminating latency by pipelining operations at the different levels.
+ *
+ * This driver allows a configurable number of commands to be enqueued
+ * for each target/lun combination (experimentally, I have discovered
+ * that two seems to work best) and will ultimately allow for
+ * SCSI-II tagged queuing.
+ *
+ *
+ * Architecture :
+ * This driver is built around a Linux queue of commands waiting to
+ * be executed, and a shared Linux/NCR array of commands to start. Commands
+ * are transfered to the array by the run_process_issue_queue() function
+ * which is called whenever a command completes.
+ *
+ * As commands are completed, the interrupt routine is triggered,
+ * looks for commands in the linked list of completed commands with
+ * valid status, removes these commands from a list of running commands,
+ * calls the done routine, and flags their target/luns as not busy.
+ *
+ * Due to limitations in the intelligence of the NCR chips, certain
+ * concessions are made. In many cases, it is easier to dynamically
+ * generate/fix-up code rather than calculate on the NCR at run time.
+ * So, code is generated or fixed up for
+ *
+ * - Handling data transfers, using a variable number of MOVE instructions
+ * interspersed with CALL MSG_IN, WHEN MSGIN instructions.
+ *
+ * The DATAIN and DATAOUT routines are separate, so that an incorrect
+ * direction can be trapped, and space isn't wasted.
+ *
+ * It may turn out that we're better off using some sort
+ * of table indirect instruction in a loop with a variable
+ * sized table on the NCR53c710 and newer chips.
+ *
+ * - Checking for reselection (NCR53c710 and better)
+ *
+ * - Handling the details of SCSI context switches (NCR53c710 and better),
+ * such as reprogramming appropriate synchronous parameters,
+ * removing the dsa structure from the NCR's queue of outstanding
+ * commands, etc.
+ *
+ */
+
+#ifdef MODULE
+#include <linux/module.h>
+#endif
+
+#include <linux/config.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <linux/delay.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/bios32.h>
+#include <linux/pci.h>
+#include <linux/proc_fs.h>
+#include <linux/string.h>
+#include <linux/malloc.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/time.h>
+#include <linux/blk.h>
+
+#ifdef CONFIG_AMIGA
+#include <asm/pgtable.h>
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+#include <asm/irq.h>
+
+#define BIG_ENDIAN
+#define NO_IO_SPACE
+#endif
+
+#ifdef CONFIG_MVME166
+#include <asm/mvme166hw.h>
+
+#define BIG_ENDIAN
+#define NO_IO_SPACE
+#endif
+
+#include "scsi.h"
+#include "hosts.h"
+#include "53c7xx.h"
+#include "constants.h"
+#include "sd.h"
+#include <linux/stat.h>
+#include <linux/stddef.h>
+
+#ifdef NO_IO_SPACE
+/*
+ * The following make the definitions in 53c7xx.h (write8, etc) smaller,
+ * we don't have seperate i/o space anyway.
+ */
+#undef inb
+#undef outb
+#define inb(x) 1
+#define inw(x) 1
+#define inl(x) 1
+#define outb(x,y) 1
+#define outw(x,y) 1
+#define outl(x,y) 1
+#endif
+
+static int check_address (unsigned long addr, int size);
+static void dump_events (struct Scsi_Host *host, int count);
+static Scsi_Cmnd * return_outstanding_commands (struct Scsi_Host *host,
+ int free, int issue);
+static void hard_reset (struct Scsi_Host *host);
+static void ncr_scsi_reset (struct Scsi_Host *host);
+static void print_lots (struct Scsi_Host *host);
+static void set_synchronous (struct Scsi_Host *host, int target, int sxfer,
+ int scntl3, int now_connected);
+static int datapath_residual (struct Scsi_Host *host);
+static const char * sbcl_to_phase (int sbcl);
+static void print_progress (Scsi_Cmnd *cmd);
+static void print_queues (struct Scsi_Host *host);
+static void process_issue_queue (unsigned long flags);
+static int shutdown (struct Scsi_Host *host);
+static void abnormal_finished (struct NCR53c7x0_cmd *cmd, int result);
+static int disable (struct Scsi_Host *host);
+static int NCR53c7xx_run_tests (struct Scsi_Host *host);
+void NCR53c7x0_intr(int irq, void *dev_id, struct pt_regs * regs);
+static int ncr_halt (struct Scsi_Host *host);
+static void intr_phase_mismatch (struct Scsi_Host *host, struct NCR53c7x0_cmd
+ *cmd);
+static void intr_dma (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd);
+static void print_dsa (struct Scsi_Host *host, u32 *dsa,
+ const char *prefix);
+static int print_insn (struct Scsi_Host *host, const u32 *insn,
+ const char *prefix, int kernel);
+
+static void NCR53c7xx_dsa_fixup (struct NCR53c7x0_cmd *cmd);
+static void NCR53c7x0_init_fixup (struct Scsi_Host *host);
+static int NCR53c7x0_dstat_sir_intr (struct Scsi_Host *host, struct
+ NCR53c7x0_cmd *cmd);
+static void NCR53c7x0_soft_reset (struct Scsi_Host *host);
+
+/* Size of event list (per host adapter) */
+static int track_events = 0;
+static struct Scsi_Host *first_host = NULL; /* Head of list of NCR boards */
+static Scsi_Host_Template *the_template = NULL;
+
+/* NCR53c710 script handling code */
+
+#include "53c7xx_d.h"
+#ifdef A_int_debug_sync
+#define DEBUG_SYNC_INTR A_int_debug_sync
+#endif
+int NCR53c7xx_script_len = sizeof (SCRIPT);
+int NCR53c7xx_dsa_len = A_dsa_end + Ent_dsa_zero - Ent_dsa_code_template;
+#ifdef FORCE_DSA_ALIGNMENT
+int CmdPageStart = (0 - Ent_dsa_zero - sizeof(struct NCR53c7x0_cmd)) & 0xff;
+#endif
+int flushsize;
+
+static char *setup_strings[] =
+ {"","","","","","","",""};
+
+#define MAX_SETUP_STRINGS (sizeof(setup_strings) / sizeof(char *))
+#define SETUP_BUFFER_SIZE 200
+static char setup_buffer[SETUP_BUFFER_SIZE];
+static char setup_used[MAX_SETUP_STRINGS];
+
+void ncr53c7xx_setup (char *str, int *ints)
+{
+ int i;
+ char *p1, *p2;
+
+ p1 = setup_buffer;
+ *p1 = '\0';
+ if (str)
+ strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
+ setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
+ p1 = setup_buffer;
+ i = 0;
+ while (*p1 && (i < MAX_SETUP_STRINGS)) {
+ p2 = strchr(p1, ',');
+ if (p2) {
+ *p2 = '\0';
+ if (p1 != p2)
+ setup_strings[i] = p1;
+ p1 = p2 + 1;
+ i++;
+ }
+ else {
+ setup_strings[i] = p1;
+ break;
+ }
+ }
+ for (i=0; i<MAX_SETUP_STRINGS; i++)
+ setup_used[i] = 0;
+}
+
+
+/* check_setup_strings() returns index if key found, 0 if not
+ */
+
+static int check_setup_strings(char *key, int *flags, int *val, char *buf)
+{
+int x;
+char *cp;
+
+ for (x=0; x<MAX_SETUP_STRINGS; x++) {
+ if (setup_used[x])
+ continue;
+ if (!strncmp(setup_strings[x], key, strlen(key)))
+ break;
+ if (!strncmp(setup_strings[x], "next", strlen("next")))
+ return 0;
+ }
+ if (x == MAX_SETUP_STRINGS)
+ return 0;
+ setup_used[x] = 1;
+ cp = setup_strings[x] + strlen(key);
+ *val = -1;
+ if (*cp != ':')
+ return ++x;
+ cp++;
+ if ((*cp >= '0') && (*cp <= '9')) {
+ *val = simple_strtoul(cp,NULL,0);
+ }
+ return ++x;
+}
+
+
+
+/*
+ * KNOWN BUGS :
+ * - There is some sort of conflict when the PPP driver is compiled with
+ * support for 16 channels?
+ *
+ * - On systems which predate the 1.3.x initialization order change,
+ * the NCR driver will cause Cannot get free page messages to appear.
+ * These are harmless, but I don't know of an easy way to avoid them.
+ *
+ * - With OPTION_DISCONNECT, on two systems under unknown circumstances,
+ * we get a PHASE MISMATCH with DSA set to zero (suggests that we
+ * are occurring somewhere in the reselection code) where
+ * DSP=some value DCMD|DBC=same value.
+ *
+ * Closer inspection suggests that we may be trying to execute
+ * some portion of the DSA?
+ * scsi0 : handling residual transfer (+ 0 bytes from DMA FIFO)
+ * scsi0 : handling residual transfer (+ 0 bytes from DMA FIFO)
+ * scsi0 : no current command : unexpected phase MSGIN.
+ * DSP=0x1c46cc, DCMD|DBC=0x1c46ac, DSA=0x0
+ * DSPS=0x0, TEMP=0x1c3e70, DMODE=0x80
+ * scsi0 : DSP->
+ * 001c46cc : 0x001c46cc 0x00000000
+ * 001c46d4 : 0x001c5ea0 0x000011f8
+ *
+ * Changed the print code in the phase_mismatch handler so
+ * that we call print_lots to try to diagnose this.
+ *
+ */
+
+/*
+ * Possible future direction of architecture for max performance :
+ *
+ * We're using a single start array for the NCR chip. This is
+ * sub-optimal, because we cannot add a command which would conflict with
+ * an executing command to this start queue, and therefore must insert the
+ * next command for a given I/T/L combination after the first has completed;
+ * incurring our interrupt latency between SCSI commands.
+ *
+ * To allow further pipelining of the NCR and host CPU operation, we want
+ * to set things up so that immediately on termination of a command destined
+ * for a given LUN, we get that LUN busy again.
+ *
+ * To do this, we need to add a 32 bit pointer to which is jumped to
+ * on completion of a command. If no new command is available, this
+ * would point to the usual DSA issue queue select routine.
+ *
+ * If one were, it would point to a per-NCR53c7x0_cmd select routine
+ * which starts execution immediately, inserting the command at the head
+ * of the start queue if the NCR chip is selected or reselected.
+ *
+ * We would change so that we keep a list of outstanding commands
+ * for each unit, rather than a single running_list. We'd insert
+ * a new command into the right running list; if the NCR didn't
+ * have something running for that yet, we'd put it in the
+ * start queue as well. Some magic needs to happen to handle the
+ * race condition between the first command terminating before the
+ * new one is written.
+ *
+ * Potential for profiling :
+ * Call do_gettimeofday(struct timeval *tv) to get 800ns resolution.
+ */
+
+
+/*
+ * TODO :
+ * 1. To support WIDE transfers, not much needs to happen. We
+ * should do CHMOVE instructions instead of MOVEs when
+ * we have scatter/gather segments of uneven length. When
+ * we do this, we need to handle the case where we disconnect
+ * between segments.
+ *
+ * 2. Currently, when Icky things happen we do a FATAL(). Instead,
+ * we want to do an integrity check on the parts of the NCR hostdata
+ * structure which were initialized at boot time; FATAL() if that
+ * fails, and otherwise try to recover. Keep track of how many
+ * times this has happened within a single SCSI command; if it
+ * gets excessive, then FATAL().
+ *
+ * 3. Parity checking is currently disabled, and a few things should
+ * happen here now that we support synchronous SCSI transfers :
+ * 1. On soft-reset, we shoould set the EPC (Enable Parity Checking)
+ * and AAP (Assert SATN/ on parity error) bits in SCNTL0.
+ *
+ * 2. We should enable the parity interrupt in the SIEN0 register.
+ *
+ * 3. intr_phase_mismatch() needs to believe that message out is
+ * always an "acceptable" phase to have a mismatch in. If
+ * the old phase was MSG_IN, we should send a MESSAGE PARITY
+ * error. If the old phase was something else, we should send
+ * a INITIATOR_DETECTED_ERROR message. Note that this could
+ * cause a RESTORE POINTERS message; so we should handle that
+ * correctly first. Instead, we should probably do an
+ * initiator_abort.
+ *
+ * 4. MPEE bit of CTEST4 should be set so we get interrupted if
+ * we detect an error.
+ *
+ *
+ * 5. The initial code has been tested on the NCR53c810. I don't
+ * have access to NCR53c700, 700-66 (Forex boards), NCR53c710
+ * (NCR Pentium systems), NCR53c720, NCR53c820, or NCR53c825 boards to
+ * finish development on those platforms.
+ *
+ * NCR53c820/825/720 - need to add wide transfer support, including WDTR
+ * negotiation, programming of wide transfer capabilities
+ * on reselection and table indirect selection.
+ *
+ * NCR53c710 - need to add fatal interrupt or GEN code for
+ * command completion signaling. Need to modify all
+ * SDID, SCID, etc. registers, and table indirect select code
+ * since these use bit fielded (ie 1<<target) instead of
+ * binary encoded target ids. Need to accommodate
+ * different register mappings, probably scan through
+ * the SCRIPT code and change the non SFBR register operand
+ * of all MOVE instructions.
+ *
+ * It is rather worse than this actually, the 710 corrupts
+ * both TEMP and DSA when you do a MOVE MEMORY. This
+ * screws you up all over the place. MOVE MEMORY 4 with a
+ * destination of DSA seems to work OK, which helps some.
+ * Richard Hirst richard@sleepie.demon.co.uk
+ *
+ * NCR53c700/700-66 - need to add code to refix addresses on
+ * every nexus change, eliminate all table indirect code,
+ * very messy.
+ *
+ * 6. The NCR53c7x0 series is very popular on other platforms that
+ * could be running Linux - ie, some high performance AMIGA SCSI
+ * boards use it.
+ *
+ * So, I should include #ifdef'd code so that it is
+ * compatible with these systems.
+ *
+ * Specifically, the little Endian assumptions I made in my
+ * bit fields need to change, and if the NCR doesn't see memory
+ * the right way, we need to provide options to reverse words
+ * when the scripts are relocated.
+ *
+ * 7. Use vremap() to access memory mapped boards.
+ */
+
+/*
+ * Allow for simultaneous existence of multiple SCSI scripts so we
+ * can have a single driver binary for all of the family.
+ *
+ * - one for NCR53c700 and NCR53c700-66 chips (not yet supported)
+ * - one for rest (only the NCR53c810, 815, 820, and 825 are currently
+ * supported)
+ *
+ * So that we only need two SCSI scripts, we need to modify things so
+ * that we fixup register accesses in READ/WRITE instructions, and
+ * we'll also have to accommodate the bit vs. binary encoding of IDs
+ * with the 7xx chips.
+ */
+
+#define ROUNDUP(adr,type) \
+ ((void *) (((long) (adr) + sizeof(type) - 1) & ~(sizeof(type) - 1)))
+
+
+/*
+ * Function: issue_to_cmd
+ *
+ * Purpose: convert jump instruction in issue array to NCR53c7x0_cmd
+ * structure pointer.
+ *
+ * Inputs; issue - pointer to start of NOP or JUMP instruction
+ * in issue array.
+ *
+ * Returns: pointer to command on success; 0 if opcode is NOP.
+ */
+
+static inline struct NCR53c7x0_cmd *
+issue_to_cmd (struct Scsi_Host *host, struct NCR53c7x0_hostdata *hostdata,
+ u32 *issue)
+{
+ return (issue[0] != hostdata->NOP_insn) ?
+ /*
+ * If the IF TRUE bit is set, it's a JUMP instruction. The
+ * operand is a bus pointer to the dsa_begin routine for this DSA. The
+ * dsa field of the NCR53c7x0_cmd structure starts with the
+ * DSA code template. By converting to a virtual address,
+ * subtracting the code template size, and offset of the
+ * dsa field, we end up with a pointer to the start of the
+ * structure (alternatively, we could use the
+ * dsa_cmnd field, an anachronism from when we weren't
+ * sure what the relationship between the NCR structures
+ * and host structures were going to be.
+ */
+ (struct NCR53c7x0_cmd *) ((char *) bus_to_virt (issue[1]) -
+ (hostdata->E_dsa_code_begin - hostdata->E_dsa_code_template) -
+ offsetof(struct NCR53c7x0_cmd, dsa))
+ /* If the IF TRUE bit is not set, it's a NOP */
+ : NULL;
+}
+
+
+/*
+ * FIXME: we should junk these, in favor of synchronous_want and
+ * wide_want in the NCR53c7x0_hostdata structure.
+ */
+
+/* Template for "preferred" synchronous transfer parameters. */
+
+static const unsigned char sdtr_message[] = {
+#ifdef CONFIG_SCSI_NCR53C7xx_FAST
+ EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 25 /* *4ns */, 8 /* off */
+#else
+ EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 50 /* *4ns */, 8 /* off */
+#endif
+};
+
+/* Template to request asynchronous transfers */
+
+static const unsigned char async_message[] = {
+ EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 0, 0 /* asynchronous */
+};
+
+/* Template for "preferred" WIDE transfer parameters */
+
+static const unsigned char wdtr_message[] = {
+ EXTENDED_MESSAGE, 2 /* length */, EXTENDED_WDTR, 1 /* 2^1 bytes */
+};
+
+/*
+ * Function : struct Scsi_Host *find_host (int host)
+ *
+ * Purpose : KGDB support function which translates a host number
+ * to a host structure.
+ *
+ * Inputs : host - number of SCSI host
+ *
+ * Returns : NULL on failure, pointer to host structure on success.
+ */
+
+static struct Scsi_Host *
+find_host (int host) {
+ struct Scsi_Host *h;
+ for (h = first_host; h && h->host_no != host; h = h->next);
+ if (!h) {
+ printk (KERN_ALERT "scsi%d not found\n", host);
+ return NULL;
+ } else if (h->hostt != the_template) {
+ printk (KERN_ALERT "scsi%d is not a NCR board\n", host);
+ return NULL;
+ }
+ return h;
+}
+
+/*
+ * Function : request_synchronous (int host, int target)
+ *
+ * Purpose : KGDB interface which will allow us to negotiate for
+ * synchronous transfers. This ill be replaced with a more
+ * integrated function; perhaps a new entry in the scsi_host
+ * structure, accessible via an ioctl() or perhaps /proc/scsi.
+ *
+ * Inputs : host - number of SCSI host; target - number of target.
+ *
+ * Returns : 0 when negotiation has been setup for next SCSI command,
+ * -1 on failure.
+ */
+
+static int
+request_synchronous (int host, int target) {
+ struct Scsi_Host *h;
+ struct NCR53c7x0_hostdata *hostdata;
+ unsigned long flags;
+ if (target < 0) {
+ printk (KERN_ALERT "target %d is bogus\n", target);
+ return -1;
+ }
+ if (!(h = find_host (host)))
+ return -1;
+ else if (h->this_id == target) {
+ printk (KERN_ALERT "target %d is host ID\n", target);
+ return -1;
+ }
+ else if (target > h->max_id) {
+ printk (KERN_ALERT "target %d exceeds maximum of %d\n", target,
+ h->max_id);
+ return -1;
+ }
+ hostdata = (struct NCR53c7x0_hostdata *)h->hostdata;
+
+ save_flags(flags);
+ cli();
+ if (hostdata->initiate_sdtr & (1 << target)) {
+ restore_flags(flags);
+ printk (KERN_ALERT "target %d already doing SDTR\n", target);
+ return -1;
+ }
+ hostdata->initiate_sdtr |= (1 << target);
+ restore_flags(flags);
+ return 0;
+}
+
+/*
+ * Function : request_disconnect (int host, int on_or_off)
+ *
+ * Purpose : KGDB support function, tells us to allow or disallow
+ * disconnections.
+ *
+ * Inputs : host - number of SCSI host; on_or_off - non-zero to allow,
+ * zero to disallow.
+ *
+ * Returns : 0 on success, * -1 on failure.
+ */
+
+static int
+request_disconnect (int host, int on_or_off) {
+ struct Scsi_Host *h;
+ struct NCR53c7x0_hostdata *hostdata;
+ if (!(h = find_host (host)))
+ return -1;
+ hostdata = (struct NCR53c7x0_hostdata *) h->hostdata;
+ if (on_or_off)
+ hostdata->options |= OPTION_DISCONNECT;
+ else
+ hostdata->options &= ~OPTION_DISCONNECT;
+ return 0;
+}
+
+/*
+ * Function : static void NCR53c7x0_driver_init (struct Scsi_Host *host)
+ *
+ * Purpose : Initialize internal structures, as required on startup, or
+ * after a SCSI bus reset.
+ *
+ * Inputs : host - pointer to this host adapter's structure
+ */
+
+static void
+NCR53c7x0_driver_init (struct Scsi_Host *host) {
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ int i, j;
+ u32 *ncrcurrent;
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+
+ for (i = 0; i < 16; ++i) {
+ hostdata->request_sense[i] = 0;
+ for (j = 0; j < 8; ++j)
+ hostdata->busy[i][j] = 0;
+ set_synchronous (host, i, /* sxfer */ 0, hostdata->saved_scntl3, 0);
+ }
+ hostdata->issue_queue = NULL;
+ hostdata->running_list = hostdata->finished_queue =
+ hostdata->ncrcurrent = NULL;
+ for (i = 0, ncrcurrent = (u32 *) hostdata->schedule;
+ i < host->can_queue; ++i, ncrcurrent += 2) {
+ ncrcurrent[0] = hostdata->NOP_insn;
+ ncrcurrent[1] = 0xdeadbeef;
+ }
+ ncrcurrent[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24) | DBC_TCI_TRUE;
+ ncrcurrent[1] = (u32) virt_to_bus (hostdata->script) +
+ hostdata->E_wait_reselect;
+ hostdata->reconnect_dsa_head = 0;
+ hostdata->addr_reconnect_dsa_head = (u32)
+ virt_to_bus((void *) &(hostdata->reconnect_dsa_head));
+ hostdata->expecting_iid = 0;
+ hostdata->expecting_sto = 0;
+ if (hostdata->options & OPTION_ALWAYS_SYNCHRONOUS)
+ hostdata->initiate_sdtr = 0xffff;
+ else
+ hostdata->initiate_sdtr = 0;
+ hostdata->talked_to = 0;
+ hostdata->idle = 1;
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+}
+
+/*
+ * Function : static int clock_to_ccf_710 (int clock)
+ *
+ * Purpose : Return the clock conversion factor for a given SCSI clock.
+ *
+ * Inputs : clock - SCSI clock expressed in Hz.
+ *
+ * Returns : ccf on success, -1 on failure.
+ */
+
+static int
+clock_to_ccf_710 (int clock) {
+ if (clock <= 16666666)
+ return -1;
+ if (clock <= 25000000)
+ return 2; /* Divide by 1.0 */
+ else if (clock <= 37500000)
+ return 1; /* Divide by 1.5 */
+ else if (clock <= 50000000)
+ return 0; /* Divide by 2.0 */
+ else if (clock <= 66000000)
+ return 3; /* Divide by 3.0 */
+ else
+ return -1;
+}
+
+/*
+ * Function : static int NCR53c7x0_init (struct Scsi_Host *host)
+ *
+ * Purpose : initialize the internal structures for a given SCSI host
+ *
+ * Inputs : host - pointer to this host adapter's structure
+ *
+ * Preconditions : when this function is called, the chip_type
+ * field of the hostdata structure MUST have been set.
+ *
+ * Returns : 0 on success, -1 on failure.
+ */
+
+int
+NCR53c7x0_init (struct Scsi_Host *host) {
+ NCR53c7x0_local_declare();
+ int i, ccf;
+ unsigned char revision;
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ struct Scsi_Host *search;
+ /*
+ * There are some things which we need to know about in order to provide
+ * a semblance of support. Print 'em if they aren't what we expect,
+ * otherwise don't add to the noise.
+ *
+ * -1 means we don't know what to expect.
+ */
+ int val, flags;
+ char buf[32];
+ int expected_id = -1;
+ int expected_clock = -1;
+ int uninitialized = 0;
+#ifdef NO_IO_SPACE
+ int expected_mapping = OPTION_MEMORY_MAPPED;
+#else
+ int expected_mapping = OPTION_IO_MAPPED;
+#endif
+ for (i=0;i<7;i++)
+ hostdata->valid_ids[i] = 1; /* Default all ID's to scan */
+
+ /* Parse commandline flags */
+ if (check_setup_strings("nosync",&flags,&val,buf))
+ {
+ hostdata->options |= OPTION_NO_ASYNC;
+ hostdata->options &= ~(OPTION_SYNCHRONOUS | OPTION_ALWAYS_SYNCHRONOUS);
+ }
+
+ if (check_setup_strings("nodisconnect",&flags,&val,buf))
+ hostdata->options &= ~OPTION_DISCONNECT;
+
+ if (check_setup_strings("validids",&flags,&val,buf))
+ {
+ for (i=0;i<7;i++)
+ hostdata->valid_ids[i] = val & (1<<i);
+ }
+
+ if ((i = check_setup_strings("next",&flags,&val,buf)))
+ {
+ while (i)
+ setup_used[--i] = 1;
+ }
+
+
+ NCR53c7x0_local_setup(host);
+
+ switch (hostdata->chip) {
+ case 710:
+ hostdata->dstat_sir_intr = NCR53c7x0_dstat_sir_intr;
+ hostdata->init_save_regs = NULL;
+ hostdata->dsa_fixup = NCR53c7xx_dsa_fixup;
+ hostdata->init_fixup = NCR53c7x0_init_fixup;
+ hostdata->soft_reset = NCR53c7x0_soft_reset;
+ hostdata->run_tests = NCR53c7xx_run_tests;
+ expected_clock = hostdata->scsi_clock = 50000000;
+ expected_id = 7;
+ break;
+ default:
+ printk ("scsi%d : chip type of %d is not supported yet, detaching.\n",
+ host->host_no, hostdata->chip);
+ scsi_unregister (host);
+ return -1;
+ }
+
+ /* Assign constants accessed by NCR */
+ hostdata->NCR53c7xx_zero = 0;
+ hostdata->NCR53c7xx_msg_reject = MESSAGE_REJECT;
+ hostdata->NCR53c7xx_msg_abort = ABORT;
+ hostdata->NCR53c7xx_msg_nop = NOP;
+ hostdata->NOP_insn = (DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24;
+
+ if (expected_mapping == -1 ||
+ (hostdata->options & (OPTION_MEMORY_MAPPED)) !=
+ (expected_mapping & OPTION_MEMORY_MAPPED))
+ printk ("scsi%d : using %s mapped access\n", host->host_no,
+ (hostdata->options & OPTION_MEMORY_MAPPED) ? "memory" :
+ "io");
+
+ hostdata->dmode = (hostdata->chip == 700 || hostdata->chip == 70066) ?
+ DMODE_REG_00 : DMODE_REG_10;
+ hostdata->istat = ((hostdata->chip / 100) == 8) ?
+ ISTAT_REG_800 : ISTAT_REG_700;
+
+/* Only the ISTAT register is readable when the NCR is running, so make
+ sure it's halted. */
+ ncr_halt(host);
+
+/*
+ * XXX - the NCR53c700 uses bitfielded registers for SCID, SDID, etc,
+ * as does the 710 with one bit per SCSI ID. Conversely, the NCR
+ * uses a normal, 3 bit binary representation of these values.
+ *
+ * Get the rest of the NCR documentation, and FIND OUT where the change
+ * was.
+ */
+
+#if 0
+ /* May not be able to do this - chip my not have been set up yet */
+ tmp = hostdata->this_id_mask = NCR53c7x0_read8(SCID_REG);
+ for (host->this_id = 0; tmp != 1; tmp >>=1, ++host->this_id);
+#else
+ host->this_id = 7;
+#endif
+
+/*
+ * Note : we should never encounter a board setup for ID0. So,
+ * if we see ID0, assume that it was uninitialized and set it
+ * to the industry standard 7.
+ */
+ if (!host->this_id) {
+ printk("scsi%d : initiator ID was %d, changing to 7\n",
+ host->host_no, host->this_id);
+ host->this_id = 7;
+ hostdata->this_id_mask = 1 << 7;
+ uninitialized = 1;
+ };
+
+ if (expected_id == -1 || host->this_id != expected_id)
+ printk("scsi%d : using initiator ID %d\n", host->host_no,
+ host->this_id);
+
+ /*
+ * Save important registers to allow a soft reset.
+ */
+
+ /*
+ * CTEST7 controls cache snooping, burst mode, and support for
+ * external differential drivers. This isn't currently used - the
+ * default value may not be optimal anyway.
+ * Even worse, it may never have been set up since reset.
+ */
+ hostdata->saved_ctest7 = NCR53c7x0_read8(CTEST7_REG) & CTEST7_SAVE;
+ revision = (NCR53c7x0_read8(CTEST8_REG) & 0xF0) >> 4;
+ switch (revision) {
+ case 1:
+ revision = 0;
+ break;
+ case 2:
+ revision = 1;
+ break;
+ case 4:
+ revision = 2;
+ break;
+ case 8:
+ revision = 3;
+ break;
+ default:
+ revision = 255;
+ break;
+ }
+ printk("scsi%d: Revision 0x%x\n",host->host_no,revision);
+
+ /*
+ * On NCR53c700 series chips, DCNTL controls the SCSI clock divisor,
+ * on 800 series chips, it allows for a totem-pole IRQ driver.
+ * NOTE saved_dcntl currently overwritten in init function.
+ * The value read here may be garbage anyway, MVME166 board at least
+ * does not initialise chip if kernel arrived via tftp.
+ */
+
+ hostdata->saved_dcntl = NCR53c7x0_read8(DCNTL_REG);
+
+ /*
+ * DMODE controls DMA burst length, and on 700 series chips,
+ * 286 mode and bus width
+ * NOTE: On MVME166, chip may have been reset, so this could be a
+ * power-on/reset default value.
+ */
+ hostdata->saved_dmode = NCR53c7x0_read8(hostdata->dmode);
+
+ /*
+ * Now that burst length and enabled/disabled status is known,
+ * clue the user in on it.
+ */
+
+ ccf = clock_to_ccf_710 (expected_clock);
+
+ for (i = 0; i < 16; ++i)
+ hostdata->cmd_allocated[i] = 0;
+
+ if (hostdata->init_save_regs)
+ hostdata->init_save_regs (host);
+ if (hostdata->init_fixup)
+ hostdata->init_fixup (host);
+
+ if (!the_template) {
+ the_template = host->hostt;
+ first_host = host;
+ }
+
+ /*
+ * Linux SCSI drivers have always been plagued with initialization
+ * problems - some didn't work with the BIOS disabled since they expected
+ * initialization from it, some didn't work when the networking code
+ * was enabled and registers got scrambled, etc.
+ *
+ * To avoid problems like this, in the future, we will do a soft
+ * reset on the SCSI chip, taking it back to a sane state.
+ */
+
+ hostdata->soft_reset (host);
+
+#if 1
+ hostdata->debug_count_limit = -1;
+#else
+ hostdata->debug_count_limit = 1;
+#endif
+ hostdata->intrs = -1;
+ hostdata->resets = -1;
+ memcpy ((void *) hostdata->synchronous_want, (void *) sdtr_message,
+ sizeof (hostdata->synchronous_want));
+
+ NCR53c7x0_driver_init (host);
+
+ /*
+ * Set up an interrupt handler if we aren't already sharing an IRQ
+ * with another board.
+ */
+
+#ifdef CONFIG_MVME166
+ if (request_irq(IRQ_MVME166_SCSI, NCR53c7x0_intr, 0, "SCSI-script", NULL))
+ panic ("Couldn't get SCSI IRQ");
+#ifdef MVME166_INTFLY
+ else if (request_irq(IRQ_MVME166_FLY, NCR53c7x0_intr, 0, "SCSI-intfly", NULL))
+ panic ("Couldn't get INT_FLY IRQ");
+#endif
+#else
+ for (search = first_host; search && !(search->hostt == the_template &&
+ search->irq == host->irq && search != host); search=search->next);
+
+ if (!search) {
+#ifdef CONFIG_AMIGA
+ if (request_irq(IRQ_AMIGA_PORTS, NCR53c7x0_intr, 0, "53c7xx", NCR53c7x0_intr)) {
+#else
+ if (request_irq(host->irq, NCR53c7x0_intr, SA_INTERRUPT, "53c7xx", NULL)) {
+#endif
+ printk("scsi%d : IRQ%d not free, detaching\n"
+ " You have either a configuration problem, or a\n"
+ " broken BIOS. You may wish to manually assign\n"
+ " an interrupt to the NCR board rather than using\n"
+ " an automatic setting.\n",
+ host->host_no, host->irq);
+ scsi_unregister (host);
+ return -1;
+ }
+ } else {
+ printk("scsi%d : using interrupt handler previously installed for scsi%d\n",
+ host->host_no, search->host_no);
+ }
+#endif
+
+ if ((hostdata->run_tests && hostdata->run_tests(host) == -1) ||
+ (hostdata->options & OPTION_DEBUG_TESTS_ONLY)) {
+ /* XXX Should disable interrupts, etc. here */
+ scsi_unregister (host);
+ return -1;
+ } else {
+ if (host->io_port) {
+ host->n_io_port = 128;
+ request_region (host->io_port, host->n_io_port, "ncr53c7xx");
+ }
+ }
+
+ if (NCR53c7x0_read8 (SBCL_REG) & SBCL_BSY) {
+ printk ("scsi%d : bus wedge, doing SCSI reset\n", host->host_no);
+ hard_reset (host);
+ }
+ return 0;
+}
+
+/*
+ * Function : static int normal_init(Scsi_Host_Template *tpnt, int board,
+ * int chip, u32 base, int io_port, int irq, int dma, int pcivalid,
+ * unsigned char pci_bus, unsigned char pci_device_fn,
+ * long long options);
+ *
+ * Purpose : initializes a NCR53c7,8x0 based on base addresses,
+ * IRQ, and DMA channel.
+ *
+ * Useful where a new NCR chip is backwards compatible with
+ * a supported chip, but the DEVICE ID has changed so it
+ * doesn't show up when the autoprobe does a pcibios_find_device.
+ *
+ * Inputs : tpnt - Template for this SCSI adapter, board - board level
+ * product, chip - 710
+ *
+ * Returns : 0 on success, -1 on failure.
+ *
+ */
+
+int
+ncr53c7xx_init (Scsi_Host_Template *tpnt, int board, int chip,
+ u32 base, int io_port, int irq, int dma, long long options, int clock)
+{
+ struct Scsi_Host *instance;
+ struct NCR53c7x0_hostdata *hostdata;
+ char chip_str[80];
+ int script_len = 0, dsa_len = 0, size = 0, max_cmd_size = 0,
+ schedule_size = 0, ok = 0;
+ void *tmp;
+
+ switch (chip) {
+ case 710:
+ schedule_size = (tpnt->can_queue + 1) * 8 /* JUMP instruction size */;
+ script_len = NCR53c7xx_script_len;
+ dsa_len = NCR53c7xx_dsa_len;
+ options |= OPTION_INTFLY;
+ sprintf (chip_str, "NCR53c%d", chip);
+ break;
+ default:
+ printk("scsi-ncr53c7xx : unsupported SCSI chip %d\n", chip);
+ return -1;
+ }
+
+ printk("scsi-ncr53c7xx : %s at memory 0x%x, io 0x%x, irq %d",
+ chip_str, (unsigned) base, io_port, irq);
+ if (dma == DMA_NONE)
+ printk("\n");
+ else
+ printk(", dma %d\n", dma);
+
+ if (options & OPTION_DEBUG_PROBE_ONLY) {
+ printk ("scsi-ncr53c7xx : probe only enabled, aborting initialization\n");
+ return -1;
+ }
+
+ max_cmd_size = sizeof(struct NCR53c7x0_cmd) + dsa_len +
+ /* Size of dynamic part of command structure : */
+ 2 * /* Worst case : we don't know if we need DATA IN or DATA out */
+ ( 2 * /* Current instructions per scatter/gather segment */
+ tpnt->sg_tablesize +
+ 3 /* Current startup / termination required per phase */
+ ) *
+ 8 /* Each instruction is eight bytes */;
+
+ /* Allocate fixed part of hostdata, dynamic part to hold appropriate
+ SCSI SCRIPT(tm) plus a single, maximum-sized NCR53c7x0_cmd structure.
+
+ We need a NCR53c7x0_cmd structure for scan_scsis() when we are
+ not loaded as a module, and when we're loaded as a module, we
+ can't use a non-dynamically allocated structure because modules
+ are vmalloc()'d, which can allow structures to cross page
+ boundaries and breaks our physical/virtual address assumptions
+ for DMA.
+
+ So, we stick it past the end of our hostdata structure.
+
+ ASSUMPTION :
+ Regardless of how many simultaneous SCSI commands we allow,
+ the probe code only executes a _single_ instruction at a time,
+ so we only need one here, and don't need to allocate NCR53c7x0_cmd
+ structures for each target until we are no longer in scan_scsis
+ and kmalloc() has become functional (memory_init() happens
+ after all device driver initialization).
+ */
+
+ size = sizeof(struct NCR53c7x0_hostdata) + script_len +
+ /* Note that alignment will be guaranteed, since we put the command
+ allocated at probe time after the fixed-up SCSI script, which
+ consists of 32 bit words, aligned on a 32 bit boundary. But
+ on a 64bit machine we need 8 byte alignment for hostdata->free, so
+ we add in another 4 bytes to take care of potential misalignment
+ */
+ (sizeof(void *) - sizeof(u32)) + max_cmd_size + schedule_size;
+
+#ifdef FORCE_DSA_ALIGNMENT
+ /*
+ * 53c710 rev.0 doesn't have an add-with-carry instruction.
+ * Ensure we allocate enough memory to force DSA alignment.
+ */
+ size += 256;
+#endif
+ flushsize = size;
+ instance = scsi_register (tpnt, size);
+ if (!instance)
+ return -1;
+
+ /* FIXME : if we ever support an ISA NCR53c7xx based board, we
+ need to check if the chip is running in a 16 bit mode, and if so
+ unregister it if it is past the 16M (0x1000000) mark */
+
+ hostdata = (struct NCR53c7x0_hostdata *)
+ instance->hostdata;
+ hostdata->size = size;
+ hostdata->script_count = script_len / sizeof(u32);
+ hostdata = (struct NCR53c7x0_hostdata *) instance->hostdata;
+ hostdata->board = board;
+ hostdata->chip = chip;
+
+ /*
+ * Being memory mapped is more desirable, since
+ *
+ * - Memory accesses may be faster.
+ *
+ * - The destination and source address spaces are the same for
+ * all instructions, meaning we don't have to twiddle dmode or
+ * any other registers.
+ *
+ * So, we try for memory mapped, and if we don't get it,
+ * we go for port mapped, and that failing we tell the user
+ * it can't work.
+ */
+
+ if (base) {
+ instance->base = (unsigned char *) (unsigned long) base;
+ /* Check for forced I/O mapping */
+ if (!(options & OPTION_IO_MAPPED)) {
+ options |= OPTION_MEMORY_MAPPED;
+ ok = 1;
+ }
+ } else {
+ options &= ~OPTION_MEMORY_MAPPED;
+ }
+
+ if (io_port) {
+ instance->io_port = io_port;
+ options |= OPTION_IO_MAPPED;
+ ok = 1;
+ } else {
+ options &= ~OPTION_IO_MAPPED;
+ }
+
+ if (!ok) {
+ printk ("scsi%d : not initializing, no I/O or memory mapping known \n",
+ instance->host_no);
+ scsi_unregister (instance);
+ return -1;
+ }
+ instance->irq = irq;
+ instance->dma_channel = dma;
+
+ hostdata->options = options;
+ hostdata->dsa_len = dsa_len;
+ hostdata->max_cmd_size = max_cmd_size;
+ hostdata->num_cmds = 1;
+ /* Initialize single command */
+ tmp = (hostdata->script + hostdata->script_count);
+#ifdef FORCE_DSA_ALIGNMENT
+ {
+ void *t = ROUNDUP(tmp, void *);
+ if (((u32)t & 0xff) > CmdPageStart)
+ t = (void *)((u32)t + 255);
+ t = (void *)(((u32)t & ~0xff) + CmdPageStart);
+ hostdata->free = t;
+ printk ("scsi: Registered size increased by 256 to %d\n", size);
+ printk ("scsi: CmdPageStart = 0x%02x\n", CmdPageStart);
+ printk ("scsi: tmp = 0x%08x, hostdata->free set to 0x%08x\n",
+ (u32)tmp, (u32)t);
+ }
+#else
+ hostdata->free = ROUNDUP(tmp, void *);
+#endif
+ hostdata->free->real = tmp;
+ hostdata->free->size = max_cmd_size;
+ hostdata->free->free = NULL;
+ hostdata->free->next = NULL;
+ hostdata->extra_allocate = 0;
+
+ /* Allocate command start code space */
+ hostdata->schedule = (chip == 700 || chip == 70066) ?
+ NULL : (u32 *) ((char *)hostdata->free + max_cmd_size);
+
+/*
+ * For diagnostic purposes, we don't really care how fast things blaze.
+ * For profiling, we want to access the 800ns resolution system clock,
+ * using a 'C' call on the host processor.
+ *
+ * Therefore, there's no need for the NCR chip to directly manipulate
+ * this data, and we should put it wherever is most convenient for
+ * Linux.
+ */
+ if (track_events)
+ hostdata->events = (struct NCR53c7x0_event *) (track_events ?
+ vmalloc (sizeof (struct NCR53c7x0_event) * track_events) : NULL);
+ else
+ hostdata->events = NULL;
+
+ if (hostdata->events) {
+ memset ((void *) hostdata->events, 0, sizeof(struct NCR53c7x0_event) *
+ track_events);
+ hostdata->event_size = track_events;
+ hostdata->event_index = 0;
+ } else
+ hostdata->event_size = 0;
+
+ return NCR53c7x0_init(instance);
+}
+
+
+/*
+ * Function : static void NCR53c7x0_init_fixup (struct Scsi_Host *host)
+ *
+ * Purpose : copy and fixup the SCSI SCRIPTS(tm) code for this device.
+ *
+ * Inputs : host - pointer to this host adapter's structure
+ *
+ */
+
+static void
+NCR53c7x0_init_fixup (struct Scsi_Host *host) {
+ NCR53c7x0_local_declare();
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ unsigned char tmp;
+ int i, ncr_to_memory, memory_to_ncr;
+ u32 base;
+ NCR53c7x0_local_setup(host);
+
+
+ /* XXX - NOTE : this code MUST be made endian aware */
+ /* Copy code into buffer that was allocated at detection time. */
+ memcpy ((void *) hostdata->script, (void *) SCRIPT,
+ sizeof(SCRIPT));
+ /* Fixup labels */
+ for (i = 0; i < PATCHES; ++i)
+ hostdata->script[LABELPATCHES[i]] +=
+ virt_to_bus(hostdata->script);
+ /* Fixup addresses of constants that used to be EXTERNAL */
+
+ patch_abs_32 (hostdata->script, 0, NCR53c7xx_msg_abort,
+ virt_to_bus(&(hostdata->NCR53c7xx_msg_abort)));
+ patch_abs_32 (hostdata->script, 0, NCR53c7xx_msg_reject,
+ virt_to_bus(&(hostdata->NCR53c7xx_msg_reject)));
+ patch_abs_32 (hostdata->script, 0, NCR53c7xx_zero,
+ virt_to_bus(&(hostdata->NCR53c7xx_zero)));
+ patch_abs_32 (hostdata->script, 0, NCR53c7xx_sink,
+ virt_to_bus(&(hostdata->NCR53c7xx_sink)));
+ patch_abs_32 (hostdata->script, 0, NOP_insn,
+ virt_to_bus(&(hostdata->NOP_insn)));
+ patch_abs_32 (hostdata->script, 0, schedule,
+ virt_to_bus((void *) hostdata->schedule));
+
+ /* Fixup references to external variables: */
+ for (i = 0; i < EXTERNAL_PATCHES_LEN; ++i)
+ hostdata->script[EXTERNAL_PATCHES[i].offset] +=
+ virt_to_bus(EXTERNAL_PATCHES[i].address);
+
+ /*
+ * Fixup absolutes set at boot-time.
+ *
+ * All non-code absolute variables suffixed with "dsa_" and "int_"
+ * are constants, and need no fixup provided the assembler has done
+ * it for us (I don't know what the "real" NCR assembler does in
+ * this case, my assembler does the right magic).
+ */
+
+ patch_abs_rwri_data (hostdata->script, 0, dsa_save_data_pointer,
+ Ent_dsa_code_save_data_pointer - Ent_dsa_zero);
+ patch_abs_rwri_data (hostdata->script, 0, dsa_restore_pointers,
+ Ent_dsa_code_restore_pointers - Ent_dsa_zero);
+ patch_abs_rwri_data (hostdata->script, 0, dsa_check_reselect,
+ Ent_dsa_code_check_reselect - Ent_dsa_zero);
+
+ /*
+ * Just for the hell of it, preserve the settings of
+ * Burst Length and Enable Read Line bits from the DMODE
+ * register. Make sure SCRIPTS start automagically.
+ */
+
+#if defined(CONFIG_MVME166)
+ /* We know better what we want than 166Bug does! */
+ tmp = DMODE_10_BL_8 | DMODE_10_FC2;
+#else
+ tmp = NCR53c7x0_read8(DMODE_REG_10);
+ tmp &= (DMODE_BL_MASK | DMODE_10_FC2 | DMODE_10_FC1 | DMODE_710_PD |
+ DMODE_710_UO);
+#endif
+
+ if (!(hostdata->options & OPTION_MEMORY_MAPPED)) {
+ base = (u32) host->io_port;
+ memory_to_ncr = tmp|DMODE_800_DIOM;
+ ncr_to_memory = tmp|DMODE_800_SIOM;
+ } else {
+ base = virt_to_bus(host->base);
+ memory_to_ncr = ncr_to_memory = tmp;
+ }
+
+ /* SCRATCHB_REG_10 == SCRATCHA_REG_800, as it happens */
+ patch_abs_32 (hostdata->script, 0, addr_scratch, base + SCRATCHA_REG_800);
+ patch_abs_32 (hostdata->script, 0, addr_temp, base + TEMP_REG);
+ patch_abs_32 (hostdata->script, 0, addr_dsa, base + DSA_REG);
+
+ /*
+ * I needed some variables in the script to be accessible to
+ * both the NCR chip and the host processor. For these variables,
+ * I made the arbitrary decision to store them directly in the
+ * hostdata structure rather than in the RELATIVE area of the
+ * SCRIPTS.
+ */
+
+
+ patch_abs_rwri_data (hostdata->script, 0, dmode_memory_to_memory, tmp);
+ patch_abs_rwri_data (hostdata->script, 0, dmode_memory_to_ncr, memory_to_ncr);
+ patch_abs_rwri_data (hostdata->script, 0, dmode_ncr_to_memory, ncr_to_memory);
+
+ patch_abs_32 (hostdata->script, 0, msg_buf,
+ virt_to_bus((void *)&(hostdata->msg_buf)));
+ patch_abs_32 (hostdata->script, 0, reconnect_dsa_head,
+ virt_to_bus((void *)&(hostdata->reconnect_dsa_head)));
+ patch_abs_32 (hostdata->script, 0, addr_reconnect_dsa_head,
+ virt_to_bus((void *)&(hostdata->addr_reconnect_dsa_head)));
+ patch_abs_32 (hostdata->script, 0, reselected_identify,
+ virt_to_bus((void *)&(hostdata->reselected_identify)));
+/* reselected_tag is currently unused */
+#if 0
+ patch_abs_32 (hostdata->script, 0, reselected_tag,
+ virt_to_bus((void *)&(hostdata->reselected_tag)));
+#endif
+
+ patch_abs_32 (hostdata->script, 0, test_dest,
+ virt_to_bus((void*)&hostdata->test_dest));
+ patch_abs_32 (hostdata->script, 0, test_src,
+ virt_to_bus(&hostdata->test_source));
+ patch_abs_32 (hostdata->script, 0, saved_dsa,
+ virt_to_bus(&hostdata->saved2_dsa));
+ patch_abs_32 (hostdata->script, 0, emulfly,
+ virt_to_bus(&hostdata->emulated_intfly));
+
+ patch_abs_rwri_data (hostdata->script, 0, dsa_check_reselect,
+ (unsigned char)(Ent_dsa_code_check_reselect - Ent_dsa_zero));
+
+/* These are for event logging; the ncr_event enum contains the
+ actual interrupt numbers. */
+#ifdef A_int_EVENT_SELECT
+ patch_abs_32 (hostdata->script, 0, int_EVENT_SELECT, (u32) EVENT_SELECT);
+#endif
+#ifdef A_int_EVENT_DISCONNECT
+ patch_abs_32 (hostdata->script, 0, int_EVENT_DISCONNECT, (u32) EVENT_DISCONNECT);
+#endif
+#ifdef A_int_EVENT_RESELECT
+ patch_abs_32 (hostdata->script, 0, int_EVENT_RESELECT, (u32) EVENT_RESELECT);
+#endif
+#ifdef A_int_EVENT_COMPLETE
+ patch_abs_32 (hostdata->script, 0, int_EVENT_COMPLETE, (u32) EVENT_COMPLETE);
+#endif
+#ifdef A_int_EVENT_IDLE
+ patch_abs_32 (hostdata->script, 0, int_EVENT_IDLE, (u32) EVENT_IDLE);
+#endif
+#ifdef A_int_EVENT_SELECT_FAILED
+ patch_abs_32 (hostdata->script, 0, int_EVENT_SELECT_FAILED,
+ (u32) EVENT_SELECT_FAILED);
+#endif
+#ifdef A_int_EVENT_BEFORE_SELECT
+ patch_abs_32 (hostdata->script, 0, int_EVENT_BEFORE_SELECT,
+ (u32) EVENT_BEFORE_SELECT);
+#endif
+#ifdef A_int_EVENT_RESELECT_FAILED
+ patch_abs_32 (hostdata->script, 0, int_EVENT_RESELECT_FAILED,
+ (u32) EVENT_RESELECT_FAILED);
+#endif
+
+ /*
+ * Make sure the NCR and Linux code agree on the location of
+ * certain fields.
+ */
+
+ hostdata->E_accept_message = Ent_accept_message;
+ hostdata->E_command_complete = Ent_command_complete;
+ hostdata->E_cmdout_cmdout = Ent_cmdout_cmdout;
+ hostdata->E_data_transfer = Ent_data_transfer;
+ hostdata->E_debug_break = Ent_debug_break;
+ hostdata->E_dsa_code_template = Ent_dsa_code_template;
+ hostdata->E_dsa_code_template_end = Ent_dsa_code_template_end;
+ hostdata->E_end_data_transfer = Ent_end_data_transfer;
+ hostdata->E_initiator_abort = Ent_initiator_abort;
+ hostdata->E_msg_in = Ent_msg_in;
+ hostdata->E_other_transfer = Ent_other_transfer;
+ hostdata->E_other_in = Ent_other_in;
+ hostdata->E_other_out = Ent_other_out;
+ hostdata->E_reject_message = Ent_reject_message;
+ hostdata->E_respond_message = Ent_respond_message;
+ hostdata->E_select = Ent_select;
+ hostdata->E_select_msgout = Ent_select_msgout;
+ hostdata->E_target_abort = Ent_target_abort;
+#ifdef Ent_test_0
+ hostdata->E_test_0 = Ent_test_0;
+#endif
+ hostdata->E_test_1 = Ent_test_1;
+ hostdata->E_test_2 = Ent_test_2;
+#ifdef Ent_test_3
+ hostdata->E_test_3 = Ent_test_3;
+#endif
+ hostdata->E_wait_reselect = Ent_wait_reselect;
+ hostdata->E_dsa_code_begin = Ent_dsa_code_begin;
+
+ hostdata->dsa_cmdout = A_dsa_cmdout;
+ hostdata->dsa_cmnd = A_dsa_cmnd;
+ hostdata->dsa_datain = A_dsa_datain;
+ hostdata->dsa_dataout = A_dsa_dataout;
+ hostdata->dsa_end = A_dsa_end;
+ hostdata->dsa_msgin = A_dsa_msgin;
+ hostdata->dsa_msgout = A_dsa_msgout;
+ hostdata->dsa_msgout_other = A_dsa_msgout_other;
+ hostdata->dsa_next = A_dsa_next;
+ hostdata->dsa_select = A_dsa_select;
+ hostdata->dsa_start = Ent_dsa_code_template - Ent_dsa_zero;
+ hostdata->dsa_status = A_dsa_status;
+ hostdata->dsa_jump_dest = Ent_dsa_code_fix_jump - Ent_dsa_zero +
+ 8 /* destination operand */;
+
+ /* sanity check */
+ if (A_dsa_fields_start != Ent_dsa_code_template_end -
+ Ent_dsa_zero)
+ printk("scsi%d : NCR dsa_fields start is %d not %d\n",
+ host->host_no, A_dsa_fields_start, Ent_dsa_code_template_end -
+ Ent_dsa_zero);
+
+ printk("scsi%d : NCR code relocated to 0x%lx (virt 0x%p)\n", host->host_no,
+ virt_to_bus(hostdata->script), hostdata->script);
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+}
+
+/*
+ * Function : static int NCR53c7xx_run_tests (struct Scsi_Host *host)
+ *
+ * Purpose : run various verification tests on the NCR chip,
+ * including interrupt generation, and proper bus mastering
+ * operation.
+ *
+ * Inputs : host - a properly initialized Scsi_Host structure
+ *
+ * Preconditions : the NCR chip must be in a halted state.
+ *
+ * Returns : 0 if all tests were successful, -1 on error.
+ *
+ */
+
+static int
+NCR53c7xx_run_tests (struct Scsi_Host *host) {
+ NCR53c7x0_local_declare();
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ unsigned long timeout;
+ u32 start;
+ int failed, i;
+ unsigned long flags;
+ NCR53c7x0_local_setup(host);
+
+ /* The NCR chip _must_ be idle to run the test scripts */
+
+ save_flags(flags);
+ cli();
+ if (!hostdata->idle) {
+ printk ("scsi%d : chip not idle, aborting tests\n", host->host_no);
+ restore_flags(flags);
+ return -1;
+ }
+
+ /*
+ * Check for functional interrupts, this could work as an
+ * autoprobe routine.
+ */
+
+ if ((hostdata->options & OPTION_DEBUG_TEST1) &&
+ hostdata->state != STATE_DISABLED) {
+ hostdata->idle = 0;
+ hostdata->test_running = 1;
+ hostdata->test_completed = -1;
+ hostdata->test_dest = 0;
+ hostdata->test_source = 0xdeadbeef;
+ start = virt_to_bus (hostdata->script) + hostdata->E_test_1;
+ hostdata->state = STATE_RUNNING;
+ printk ("scsi%d : test 1", host->host_no);
+ flush_cache_all();
+ cache_push(virt_to_bus(hostdata->script), flushsize);
+ cache_clear(virt_to_bus(hostdata->script), flushsize);
+ NCR53c7x0_write32 (DSP_REG, start);
+ if (hostdata->options & OPTION_DEBUG_TRACE)
+ NCR53c7x0_write8 (DCNTL_REG, hostdata->saved_dcntl | DCNTL_SSM |
+ DCNTL_STD);
+ printk (" started\n");
+ sti();
+
+ /*
+ * This is currently a .5 second timeout, since (in theory) no slow
+ * board will take that long. In practice, we've seen one
+ * pentium which occassionally fails with this, but works with
+ * 10 times as much?
+ */
+
+ timeout = jiffies + 5 * HZ / 10;
+ while ((hostdata->test_completed == -1) && jiffies < timeout)
+ barrier();
+
+ failed = 1;
+ if (hostdata->test_completed == -1)
+ printk ("scsi%d : driver test 1 timed out%s\n",host->host_no ,
+ (hostdata->test_dest == 0xdeadbeef) ?
+ " due to lost interrupt.\n"
+ " Please verify that the correct IRQ is being used for your board,\n"
+ : "");
+ else if (hostdata->test_completed != 1)
+ printk ("scsi%d : test 1 bad interrupt value (%d)\n",
+ host->host_no, hostdata->test_completed);
+ else
+ failed = (hostdata->test_dest != 0xdeadbeef);
+
+ if (hostdata->test_dest != 0xdeadbeef) {
+ printk ("scsi%d : driver test 1 read 0x%x instead of 0xdeadbeef indicating a\n"
+ " probable cache invalidation problem. Please configure caching\n"
+ " as write-through or disabled\n",
+ host->host_no, hostdata->test_dest);
+ }
+
+ if (failed) {
+ printk ("scsi%d : DSP = 0x%p (script at 0x%p, start at 0x%x)\n",
+ host->host_no, bus_to_virt(NCR53c7x0_read32(DSP_REG)),
+ hostdata->script, start);
+ printk ("scsi%d : DSPS = 0x%x\n", host->host_no,
+ NCR53c7x0_read32(DSPS_REG));
+ restore_flags(flags);
+ return -1;
+ }
+ hostdata->test_running = 0;
+ }
+
+ if ((hostdata->options & OPTION_DEBUG_TEST2) &&
+ hostdata->state != STATE_DISABLED) {
+ u32 dsa[48];
+ unsigned char identify = IDENTIFY(0, 0);
+ unsigned char cmd[6];
+ unsigned char data[36];
+ unsigned char status = 0xff;
+ unsigned char msg = 0xff;
+
+ cmd[0] = INQUIRY;
+ cmd[1] = cmd[2] = cmd[3] = cmd[5] = 0;
+ cmd[4] = sizeof(data);
+
+ dsa[2] = 1;
+ dsa[3] = virt_to_bus(&identify);
+ dsa[4] = 6;
+ dsa[5] = virt_to_bus(&cmd);
+ dsa[6] = sizeof(data);
+ dsa[7] = virt_to_bus(&data);
+ dsa[8] = 1;
+ dsa[9] = virt_to_bus(&status);
+ dsa[10] = 1;
+ dsa[11] = virt_to_bus(&msg);
+
+ for (i = 0; i < 6; ++i) {
+#ifdef VALID_IDS
+ if (!hostdata->valid_ids[i])
+ continue;
+#endif
+ cli();
+ if (!hostdata->idle) {
+ printk ("scsi%d : chip not idle, aborting tests\n", host->host_no);
+ restore_flags(flags);
+ return -1;
+ }
+
+ /* 710: bit mapped scsi ID, async */
+ dsa[0] = (1 << i) << 16;
+ hostdata->idle = 0;
+ hostdata->test_running = 2;
+ hostdata->test_completed = -1;
+ start = virt_to_bus(hostdata->script) + hostdata->E_test_2;
+ hostdata->state = STATE_RUNNING;
+ flush_cache_all();
+ cache_clear(virt_to_bus(hostdata->script), flushsize);
+ NCR53c7x0_write32 (DSA_REG, virt_to_bus(dsa));
+ NCR53c7x0_write32 (DSP_REG, start);
+ if (hostdata->options & OPTION_DEBUG_TRACE)
+ NCR53c7x0_write8 (DCNTL_REG, hostdata->saved_dcntl |
+ DCNTL_SSM | DCNTL_STD);
+ sti();
+
+ timeout = jiffies + 5 * HZ; /* arbitrary */
+ while ((hostdata->test_completed == -1) && jiffies < timeout)
+ barrier();
+
+ NCR53c7x0_write32 (DSA_REG, 0);
+
+ if (hostdata->test_completed == 2) {
+ data[35] = 0;
+ printk ("scsi%d : test 2 INQUIRY to target %d, lun 0 : %s\n",
+ host->host_no, i, data + 8);
+ printk ("scsi%d : status ", host->host_no);
+ print_status (status);
+ printk ("\nscsi%d : message ", host->host_no);
+ print_msg (&msg);
+ printk ("\n");
+ } else if (hostdata->test_completed == 3) {
+ printk("scsi%d : test 2 no connection with target %d\n",
+ host->host_no, i);
+ if (!hostdata->idle) {
+ printk("scsi%d : not idle\n", host->host_no);
+ restore_flags(flags);
+ return -1;
+ }
+ } else if (hostdata->test_completed == -1) {
+ printk ("scsi%d : test 2 timed out\n", host->host_no);
+ restore_flags(flags);
+ return -1;
+ }
+ hostdata->test_running = 0;
+ }
+ }
+
+ restore_flags(flags);
+ return 0;
+}
+
+/*
+ * Function : static void NCR53c7xx_dsa_fixup (struct NCR53c7x0_cmd *cmd)
+ *
+ * Purpose : copy the NCR53c8xx dsa structure into cmd's dsa buffer,
+ * performing all necessary relocation.
+ *
+ * Inputs : cmd, a NCR53c7x0_cmd structure with a dsa area large
+ * enough to hold the NCR53c8xx dsa.
+ */
+
+static void
+NCR53c7xx_dsa_fixup (struct NCR53c7x0_cmd *cmd) {
+ Scsi_Cmnd *c = cmd->cmd;
+ struct Scsi_Host *host = c->host;
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ int i;
+
+ memcpy (cmd->dsa, hostdata->script + (hostdata->E_dsa_code_template / 4),
+ hostdata->E_dsa_code_template_end - hostdata->E_dsa_code_template);
+
+ /*
+ * Note : within the NCR 'C' code, dsa points to the _start_
+ * of the DSA structure, and _not_ the offset of dsa_zero within
+ * that structure used to facilitate shorter signed offsets
+ * for the 8 bit ALU.
+ *
+ * The implications of this are that
+ *
+ * - 32 bit A_dsa_* absolute values require an additional
+ * dsa_zero added to their value to be correct, since they are
+ * relative to dsa_zero which is in essentially a separate
+ * space from the code symbols.
+ *
+ * - All other symbols require no special treatment.
+ */
+
+ patch_abs_tci_data (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
+ dsa_temp_lun, c->lun);
+ patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
+ dsa_temp_addr_next, virt_to_bus(&cmd->dsa_next_addr));
+ patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
+ dsa_temp_next, virt_to_bus(cmd->dsa) + Ent_dsa_zero -
+ Ent_dsa_code_template + A_dsa_next);
+ patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
+ dsa_temp_sync, virt_to_bus((void *)hostdata->sync[c->target].script));
+ patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
+ dsa_sscf_710, virt_to_bus((void *)&hostdata->sync[c->target].sscf_710));
+ patch_abs_tci_data (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
+ dsa_temp_target, 1 << c->target);
+ /* XXX - new pointer stuff */
+ patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
+ dsa_temp_addr_saved_pointer, virt_to_bus(&cmd->saved_data_pointer));
+ patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
+ dsa_temp_addr_saved_residual, virt_to_bus(&cmd->saved_residual));
+ patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
+ dsa_temp_addr_residual, virt_to_bus(&cmd->residual));
+
+ /* XXX - new start stuff */
+
+ patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
+ dsa_temp_addr_dsa_value, virt_to_bus(&cmd->dsa_addr));
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+}
+
+/*
+ * Function : run_process_issue_queue (void)
+ *
+ * Purpose : insure that the coroutine is running and will process our
+ * request. process_issue_queue_running is checked/set here (in an
+ * inline function) rather than in process_issue_queue itself to reduce
+ * the chances of stack overflow.
+ *
+ */
+
+static volatile int process_issue_queue_running = 0;
+
+static __inline__ void
+run_process_issue_queue(void) {
+ unsigned long flags;
+ save_flags (flags);
+ cli();
+ if (!process_issue_queue_running) {
+ process_issue_queue_running = 1;
+ process_issue_queue(flags);
+ /*
+ * process_issue_queue_running is cleared in process_issue_queue
+ * once it can't do more work, and process_issue_queue exits with
+ * interrupts disabled.
+ */
+ }
+ restore_flags (flags);
+}
+
+/*
+ * Function : static void abnormal_finished (struct NCR53c7x0_cmd *cmd, int
+ * result)
+ *
+ * Purpose : mark SCSI command as finished, OR'ing the host portion
+ * of the result word into the result field of the corresponding
+ * Scsi_Cmnd structure, and removing it from the internal queues.
+ *
+ * Inputs : cmd - command, result - entire result field
+ *
+ * Preconditions : the NCR chip should be in a halted state when
+ * abnormal_finished is run, since it modifies structures which
+ * the NCR expects to have exclusive access to.
+ */
+
+static void
+abnormal_finished (struct NCR53c7x0_cmd *cmd, int result) {
+ Scsi_Cmnd *c = cmd->cmd;
+ struct Scsi_Host *host = c->host;
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ unsigned long flags;
+ int left, found;
+ volatile struct NCR53c7x0_cmd * linux_search;
+ volatile struct NCR53c7x0_cmd * volatile *linux_prev;
+ volatile u32 *ncr_prev, *ncrcurrent, ncr_search;
+
+#if 0
+ printk ("scsi%d: abnormal finished\n", host->host_no);
+#endif
+
+ save_flags(flags);
+ cli();
+ found = 0;
+ /*
+ * Traverse the NCR issue array until we find a match or run out
+ * of instructions. Instructions in the NCR issue array are
+ * either JUMP or NOP instructions, which are 2 words in length.
+ */
+
+
+ for (found = 0, left = host->can_queue, ncrcurrent = hostdata->schedule;
+ left > 0; --left, ncrcurrent += 2)
+ {
+ if (issue_to_cmd (host, hostdata, (u32 *) ncrcurrent) == cmd)
+ {
+ ncrcurrent[0] = hostdata->NOP_insn;
+ ncrcurrent[1] = 0xdeadbeef;
+ ++found;
+ break;
+ }
+ }
+
+ /*
+ * Traverse the NCR reconnect list of DSA structures until we find
+ * a pointer to this dsa or have found too many command structures.
+ * We let prev point at the next field of the previous element or
+ * head of the list, so we don't do anything different for removing
+ * the head element.
+ */
+
+ for (left = host->can_queue,
+ ncr_search = hostdata->reconnect_dsa_head,
+ ncr_prev = &hostdata->reconnect_dsa_head;
+ left >= 0 && ncr_search &&
+ ((char*)bus_to_virt(ncr_search) + hostdata->dsa_start)
+ != (char *) cmd->dsa;
+ ncr_prev = (u32*) ((char*)bus_to_virt(ncr_search) +
+ hostdata->dsa_next), ncr_search = *ncr_prev, --left);
+
+ if (left < 0)
+ printk("scsi%d: loop detected in ncr reconncect list\n",
+ host->host_no);
+ else if (ncr_search)
+ if (found)
+ printk("scsi%d: scsi %ld in ncr issue array and reconnect lists\n",
+ host->host_no, c->pid);
+ else {
+ volatile u32 * next = (u32 *)
+ ((char *)bus_to_virt(ncr_search) + hostdata->dsa_next);
+ *ncr_prev = *next;
+/* If we're at the tail end of the issue queue, update that pointer too. */
+ found = 1;
+ }
+
+ /*
+ * Traverse the host running list until we find this command or discover
+ * we have too many elements, pointing linux_prev at the next field of the
+ * linux_previous element or head of the list, search at this element.
+ */
+
+ for (left = host->can_queue, linux_search = hostdata->running_list,
+ linux_prev = &hostdata->running_list;
+ left >= 0 && linux_search && linux_search != cmd;
+ linux_prev = &(linux_search->next),
+ linux_search = linux_search->next, --left);
+
+ if (left < 0)
+ printk ("scsi%d: loop detected in host running list for scsi pid %ld\n",
+ host->host_no, c->pid);
+ else if (linux_search) {
+ *linux_prev = linux_search->next;
+ --hostdata->busy[c->target][c->lun];
+ }
+
+ /* Return the NCR command structure to the free list */
+ cmd->next = hostdata->free;
+ hostdata->free = cmd;
+ c->host_scribble = NULL;
+
+ /* And return */
+ c->result = result;
+ c->scsi_done(c);
+
+ restore_flags(flags);
+ run_process_issue_queue();
+}
+
+/*
+ * Function : static void intr_break (struct Scsi_Host *host,
+ * struct NCR53c7x0_cmd *cmd)
+ *
+ * Purpose : Handler for breakpoint interrupts from a SCSI script
+ *
+ * Inputs : host - pointer to this host adapter's structure,
+ * cmd - pointer to the command (if any) dsa was pointing
+ * to.
+ *
+ */
+
+static void
+intr_break (struct Scsi_Host *host, struct
+ NCR53c7x0_cmd *cmd) {
+ NCR53c7x0_local_declare();
+ struct NCR53c7x0_break *bp;
+#if 0
+ Scsi_Cmnd *c = cmd ? cmd->cmd : NULL;
+#endif
+ u32 *dsp;
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ unsigned long flags;
+ NCR53c7x0_local_setup(host);
+
+ /*
+ * Find the break point corresponding to this address, and
+ * dump the appropriate debugging information to standard
+ * output.
+ */
+ save_flags(flags);
+ cli();
+ flush_cache_all();
+ cache_push(virt_to_bus(hostdata->script), flushsize);
+ dsp = (u32 *) bus_to_virt(NCR53c7x0_read32(DSP_REG));
+ for (bp = hostdata->breakpoints; bp && bp->address != dsp;
+ bp = bp->next);
+ if (!bp)
+ panic("scsi%d : break point interrupt from %p with no breakpoint!",
+ host->host_no, dsp);
+
+ /*
+ * Configure the NCR chip for manual start mode, so that we can
+ * point the DSP register at the instruction that follows the
+ * INT int_debug_break instruction.
+ */
+
+ NCR53c7x0_write8 (hostdata->dmode,
+ NCR53c7x0_read8(hostdata->dmode)|DMODE_MAN);
+
+ /*
+ * And update the DSP register, using the size of the old
+ * instruction in bytes.
+ */
+
+ restore_flags(flags);
+}
+/*
+ * Function : static void print_synchronous (const char *prefix,
+ * const unsigned char *msg)
+ *
+ * Purpose : print a pretty, user and machine parsable representation
+ * of a SDTR message, including the "real" parameters, data
+ * clock so we can tell transfer rate at a glance.
+ *
+ * Inputs ; prefix - text to prepend, msg - SDTR message (5 bytes)
+ */
+
+static void
+print_synchronous (const char *prefix, const unsigned char *msg) {
+ if (msg[4]) {
+ int Hz = 1000000000 / (msg[3] * 4);
+ int integer = Hz / 1000000;
+ int fraction = (Hz - (integer * 1000000)) / 10000;
+ printk ("%speriod %dns offset %d %d.%02dMHz %s SCSI%s\n",
+ prefix, (int) msg[3] * 4, (int) msg[4], integer, fraction,
+ (((msg[3] * 4) < 200) ? "FAST" : "synchronous"),
+ (((msg[3] * 4) < 200) ? "-II" : ""));
+ } else
+ printk ("%sasynchronous SCSI\n", prefix);
+}
+
+/*
+ * Function : static void set_synchronous (struct Scsi_Host *host,
+ * int target, int sxfer, int scntl3, int now_connected)
+ *
+ * Purpose : reprogram transfers between the selected SCSI initiator and
+ * target with the given register values; in the indirect
+ * select operand, reselection script, and chip registers.
+ *
+ * Inputs : host - NCR53c7,8xx SCSI host, target - number SCSI target id,
+ * sxfer and scntl3 - NCR registers. now_connected - if non-zero,
+ * we should reprogram the registers now too.
+ *
+ * NOTE: For 53c710, scntl3 is actually used for SCF bits from
+ * SBCL, as we don't have a SCNTL3.
+ */
+
+static void
+set_synchronous (struct Scsi_Host *host, int target, int sxfer, int scntl3,
+ int now_connected) {
+ NCR53c7x0_local_declare();
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ u32 *script;
+ NCR53c7x0_local_setup(host);
+
+ /* These are eight bit registers */
+ sxfer &= 0xff;
+ scntl3 &= 0xff;
+
+ hostdata->sync[target].sxfer_sanity = sxfer;
+ hostdata->sync[target].scntl3_sanity = scntl3;
+
+/*
+ * HARD CODED : synchronous script is EIGHT words long. This
+ * must agree with 53c7.8xx.h
+ */
+
+ if ((hostdata->chip != 700) && (hostdata->chip != 70066)) {
+ hostdata->sync[target].select_indirect = (1 << target) << 16 |
+ (sxfer << 8);
+ hostdata->sync[target].sscf_710 = scntl3;
+
+ script = (u32 *) hostdata->sync[target].script;
+
+ /* XXX - add NCR53c7x0 code to reprogram SCF bits if we want to */
+ script[0] = ((DCMD_TYPE_RWRI | DCMD_RWRI_OPC_MODIFY |
+ DCMD_RWRI_OP_MOVE) << 24) |
+ (SBCL_REG << 16) | (scntl3 << 8);
+ script[1] = 0;
+ script += 2;
+
+ script[0] = ((DCMD_TYPE_RWRI | DCMD_RWRI_OPC_MODIFY |
+ DCMD_RWRI_OP_MOVE) << 24) |
+ (SXFER_REG << 16) | (sxfer << 8);
+ script[1] = 0;
+ script += 2;
+
+#ifdef DEBUG_SYNC_INTR
+ if (hostdata->options & OPTION_DEBUG_DISCONNECT) {
+ script[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_INT) << 24) | DBC_TCI_TRUE;
+ script[1] = DEBUG_SYNC_INTR;
+ script += 2;
+ }
+#endif
+
+ script[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_RETURN) << 24) | DBC_TCI_TRUE;
+ script[1] = 0;
+ script += 2;
+ }
+
+ if (hostdata->options & OPTION_DEBUG_SYNCHRONOUS)
+ printk ("scsi%d : target %d sync parameters are sxfer=0x%x, scntl3=0x%x\n",
+ host->host_no, target, sxfer, scntl3);
+
+ if (now_connected) {
+ NCR53c7x0_write8(SBCL_REG, scntl3);
+ NCR53c7x0_write8(SXFER_REG, sxfer);
+ }
+}
+
+
+/*
+ * Function : static int asynchronous (struct Scsi_Host *host, int target)
+ *
+ * Purpose : reprogram between the selected SCSI Host adapter and target
+ * (assumed to be currently connected) for asynchronous transfers.
+ *
+ * Inputs : host - SCSI host structure, target - numeric target ID.
+ *
+ * Preconditions : the NCR chip should be in one of the halted states
+ */
+
+static void
+asynchronous (struct Scsi_Host *host, int target) {
+ NCR53c7x0_local_declare();
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ NCR53c7x0_local_setup(host);
+ set_synchronous (host, target, /* no offset */ 0, hostdata->saved_scntl3,
+ 1);
+ printk ("scsi%d : setting target %d to asynchronous SCSI\n",
+ host->host_no, target);
+}
+
+/*
+ * XXX - do we want to go out of our way (ie, add extra code to selection
+ * in the NCR53c710/NCR53c720 script) to reprogram the synchronous
+ * conversion bits, or can we be content in just setting the
+ * sxfer bits? I chose to do so [richard@sleepie.demon.co.uk]
+ */
+
+/* Table for NCR53c8xx synchronous values */
+
+/* This table is also correct for 710, allowing that scf=4 is equivalent
+ * of SSCF=0 (ie use DCNTL, divide by 3) for a 50.01-66.00MHz clock.
+ * For any other clock values, we cannot use entries with SCF values of
+ * 4. I guess that for a 66MHz clock, the slowest it will set is 2MHz,
+ * and for a 50MHz clock, the slowest will be 2.27Mhz. Should check
+ * that a device doesn't try and negotiate sync below these limits!
+ */
+
+static const struct {
+ int div; /* Total clock divisor * 10 */
+ unsigned char scf; /* */
+ unsigned char tp; /* 4 + tp = xferp divisor */
+} syncs[] = {
+/* div scf tp div scf tp div scf tp */
+ { 40, 1, 0}, { 50, 1, 1}, { 60, 1, 2},
+ { 70, 1, 3}, { 75, 2, 1}, { 80, 1, 4},
+ { 90, 1, 5}, { 100, 1, 6}, { 105, 2, 3},
+ { 110, 1, 7}, { 120, 2, 4}, { 135, 2, 5},
+ { 140, 3, 3}, { 150, 2, 6}, { 160, 3, 4},
+ { 165, 2, 7}, { 180, 3, 5}, { 200, 3, 6},
+ { 210, 4, 3}, { 220, 3, 7}, { 240, 4, 4},
+ { 270, 4, 5}, { 300, 4, 6}, { 330, 4, 7}
+};
+
+/*
+ * Function : static void synchronous (struct Scsi_Host *host, int target,
+ * char *msg)
+ *
+ * Purpose : reprogram transfers between the selected SCSI initiator and
+ * target for synchronous SCSI transfers such that the synchronous
+ * offset is less than that requested and period at least as long
+ * as that requested. Also modify *msg such that it contains
+ * an appropriate response.
+ *
+ * Inputs : host - NCR53c7,8xx SCSI host, target - number SCSI target id,
+ * msg - synchronous transfer request.
+ */
+
+
+static void
+synchronous (struct Scsi_Host *host, int target, char *msg) {
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ int desire, divisor, i, limit;
+ unsigned char scntl3, sxfer;
+/* The diagnostic message fits on one line, even with max. width integers */
+ char buf[80];
+
+/* Desired transfer clock in Hz */
+ desire = 1000000000L / (msg[3] * 4);
+/* Scale the available SCSI clock by 10 so we get tenths */
+ divisor = (hostdata->scsi_clock * 10) / desire;
+
+/* NCR chips can handle at most an offset of 8 */
+ if (msg[4] > 8)
+ msg[4] = 8;
+
+ if (hostdata->options & OPTION_DEBUG_SDTR)
+ printk("scsi%d : optimal synchronous divisor of %d.%01d\n",
+ host->host_no, divisor / 10, divisor % 10);
+
+ limit = (sizeof(syncs) / sizeof(syncs[0]) -1);
+ for (i = 0; (i < limit) && (divisor > syncs[i].div); ++i);
+
+ if (hostdata->options & OPTION_DEBUG_SDTR)
+ printk("scsi%d : selected synchronous divisor of %d.%01d\n",
+ host->host_no, syncs[i].div / 10, syncs[i].div % 10);
+
+ msg[3] = ((1000000000L / hostdata->scsi_clock) * syncs[i].div / 10 / 4);
+
+ if (hostdata->options & OPTION_DEBUG_SDTR)
+ printk("scsi%d : selected synchronous period of %dns\n", host->host_no,
+ msg[3] * 4);
+
+ scntl3 = syncs[i].scf;
+ sxfer = (msg[4] << SXFER_MO_SHIFT) | (syncs[i].tp << 4);
+ if (hostdata->options & OPTION_DEBUG_SDTR)
+ printk ("scsi%d : sxfer=0x%x scntl3=0x%x\n",
+ host->host_no, (int) sxfer, (int) scntl3);
+ set_synchronous (host, target, sxfer, scntl3, 1);
+ sprintf (buf, "scsi%d : setting target %d to ", host->host_no, target);
+ print_synchronous (buf, msg);
+}
+
+/*
+ * Function : static int NCR53c7x0_dstat_sir_intr (struct Scsi_Host *host,
+ * struct NCR53c7x0_cmd *cmd)
+ *
+ * Purpose : Handler for INT generated instructions for the
+ * NCR53c810/820 SCSI SCRIPT
+ *
+ * Inputs : host - pointer to this host adapter's structure,
+ * cmd - pointer to the command (if any) dsa was pointing
+ * to.
+ *
+ */
+
+static int
+NCR53c7x0_dstat_sir_intr (struct Scsi_Host *host, struct
+ NCR53c7x0_cmd *cmd) {
+ NCR53c7x0_local_declare();
+ int print;
+ Scsi_Cmnd *c = cmd ? cmd->cmd : NULL;
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ u32 dsps,*dsp; /* Argument of the INT instruction */
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+
+ NCR53c7x0_local_setup(host);
+ dsps = NCR53c7x0_read32(DSPS_REG);
+ dsp = (u32 *) bus_to_virt(NCR53c7x0_read32(DSP_REG));
+
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk ("scsi%d : DSPS = 0x%x\n", host->host_no, dsps);
+
+ switch (dsps) {
+ case A_int_msg_1:
+ print = 1;
+ switch (hostdata->msg_buf[0]) {
+ /*
+ * Unless we've initiated synchronous negotiation, I don't
+ * think that this should happen.
+ */
+ case MESSAGE_REJECT:
+ hostdata->dsp = hostdata->script + hostdata->E_accept_message /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ if (cmd && (cmd->flags & CMD_FLAG_SDTR)) {
+ printk ("scsi%d : target %d rejected SDTR\n", host->host_no,
+ c->target);
+ cmd->flags &= ~CMD_FLAG_SDTR;
+ asynchronous (host, c->target);
+ print = 0;
+ }
+ break;
+ case INITIATE_RECOVERY:
+ printk ("scsi%d : extended contingent allegiance not supported yet, rejecting\n",
+ host->host_no);
+ /* Fall through to default */
+ hostdata->dsp = hostdata->script + hostdata->E_reject_message /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ break;
+ default:
+ printk ("scsi%d : unsupported message, rejecting\n",
+ host->host_no);
+ hostdata->dsp = hostdata->script + hostdata->E_reject_message /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ }
+ if (print) {
+ printk ("scsi%d : received message", host->host_no);
+ if (c)
+ printk (" from target %d lun %d ", c->target, c->lun);
+ print_msg ((unsigned char *) hostdata->msg_buf);
+ printk("\n");
+ }
+
+ return SPECIFIC_INT_NOTHING;
+
+
+ case A_int_msg_sdtr:
+/*
+ * At this point, hostdata->msg_buf contains
+ * 0 EXTENDED MESSAGE
+ * 1 length
+ * 2 SDTR
+ * 3 period * 4ns
+ * 4 offset
+ */
+
+ if (cmd) {
+ char buf[80];
+ sprintf (buf, "scsi%d : target %d %s ", host->host_no, c->target,
+ (cmd->flags & CMD_FLAG_SDTR) ? "accepting" : "requesting");
+ print_synchronous (buf, (unsigned char *) hostdata->msg_buf);
+
+ /*
+ * Initiator initiated, won't happen unless synchronous
+ * transfers are enabled. If we get a SDTR message in
+ * response to our SDTR, we should program our parameters
+ * such that
+ * offset <= requested offset
+ * period >= requested period
+ */
+ if (cmd->flags & CMD_FLAG_SDTR) {
+ cmd->flags &= ~CMD_FLAG_SDTR;
+ if (hostdata->msg_buf[4])
+ synchronous (host, c->target, (unsigned char *)
+ hostdata->msg_buf);
+ else
+ asynchronous (host, c->target);
+ hostdata->dsp = hostdata->script + hostdata->E_accept_message /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ return SPECIFIC_INT_NOTHING;
+ } else {
+ if (hostdata->options & OPTION_SYNCHRONOUS) {
+ cmd->flags |= CMD_FLAG_DID_SDTR;
+ synchronous (host, c->target, (unsigned char *)
+ hostdata->msg_buf);
+ } else {
+ hostdata->msg_buf[4] = 0; /* 0 offset = async */
+ asynchronous (host, c->target);
+ }
+ patch_dsa_32 (cmd->dsa, dsa_msgout_other, 0, 5);
+ patch_dsa_32 (cmd->dsa, dsa_msgout_other, 1, (u32)
+ virt_to_bus ((void *)&hostdata->msg_buf));
+ hostdata->dsp = hostdata->script +
+ hostdata->E_respond_message / sizeof(u32);
+ hostdata->dsp_changed = 1;
+ }
+ return SPECIFIC_INT_NOTHING;
+ }
+ /* Fall through to abort if we couldn't find a cmd, and
+ therefore a dsa structure to twiddle */
+ case A_int_msg_wdtr:
+ hostdata->dsp = hostdata->script + hostdata->E_reject_message /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ return SPECIFIC_INT_NOTHING;
+ case A_int_err_unexpected_phase:
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk ("scsi%d : unexpected phase\n", host->host_no);
+ return SPECIFIC_INT_ABORT;
+ case A_int_err_selected:
+ if ((hostdata->chip / 100) == 8)
+ printk ("scsi%d : selected by target %d\n", host->host_no,
+ (int) NCR53c7x0_read8(SDID_REG_800) &7);
+ else
+ printk ("scsi%d : selected by target LCRC=0x%02x\n", host->host_no,
+ (int) NCR53c7x0_read8(LCRC_REG_10));
+ hostdata->dsp = hostdata->script + hostdata->E_target_abort /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ return SPECIFIC_INT_NOTHING;
+ case A_int_err_unexpected_reselect:
+ if ((hostdata->chip / 100) == 8)
+ printk ("scsi%d : unexpected reselect by target %d lun %d\n",
+ host->host_no, (int) NCR53c7x0_read8(SDID_REG_800) & 7,
+ hostdata->reselected_identify & 7);
+ else
+ printk ("scsi%d : unexpected reselect LCRC=0x%02x\n", host->host_no,
+ (int) NCR53c7x0_read8(LCRC_REG_10));
+ hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ return SPECIFIC_INT_NOTHING;
+/*
+ * Since contingent allegiance conditions are cleared by the next
+ * command issued to a target, we must issue a REQUEST SENSE
+ * command after receiving a CHECK CONDITION status, before
+ * another command is issued.
+ *
+ * Since this NCR53c7x0_cmd will be freed after use, we don't
+ * care if we step on the various fields, so modify a few things.
+ */
+ case A_int_err_check_condition:
+#if 0
+ if (hostdata->options & OPTION_DEBUG_INTR)
+#endif
+ printk ("scsi%d : CHECK CONDITION\n", host->host_no);
+ if (!c) {
+ printk("scsi%d : CHECK CONDITION with no SCSI command\n",
+ host->host_no);
+ return SPECIFIC_INT_PANIC;
+ }
+
+ /*
+ * FIXME : this uses the normal one-byte selection message.
+ * We may want to renegotiate for synchronous & WIDE transfers
+ * since these could be the crux of our problem.
+ *
+ hostdata->NOP_insn* FIXME : once SCSI-II tagged queuing is implemented, we'll
+ * have to set this up so that the rest of the DSA
+ * agrees with this being an untagged queue'd command.
+ */
+
+ patch_dsa_32 (cmd->dsa, dsa_msgout, 0, 1);
+
+ /*
+ * Modify the table indirect for COMMAND OUT phase, since
+ * Request Sense is a six byte command.
+ */
+
+ patch_dsa_32 (cmd->dsa, dsa_cmdout, 0, 6);
+
+ c->cmnd[0] = REQUEST_SENSE;
+ c->cmnd[1] &= 0xe0; /* Zero all but LUN */
+ c->cmnd[2] = 0;
+ c->cmnd[3] = 0;
+ c->cmnd[4] = sizeof(c->sense_buffer);
+ c->cmnd[5] = 0;
+
+ /*
+ * Disable dataout phase, and program datain to transfer to the
+ * sense buffer, and add a jump to other_transfer after the
+ * command so overflow/underrun conditions are detected.
+ */
+
+ patch_dsa_32 (cmd->dsa, dsa_dataout, 0,
+ virt_to_bus(hostdata->script) + hostdata->E_other_transfer);
+ patch_dsa_32 (cmd->dsa, dsa_datain, 0,
+ virt_to_bus(cmd->data_transfer_start));
+ cmd->data_transfer_start[0] = (((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I |
+ DCMD_BMI_IO)) << 24) | sizeof(c->sense_buffer);
+ cmd->data_transfer_start[1] = (u32) virt_to_bus(c->sense_buffer);
+
+ cmd->data_transfer_start[2] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP)
+ << 24) | DBC_TCI_TRUE;
+ cmd->data_transfer_start[3] = (u32) virt_to_bus(hostdata->script) +
+ hostdata->E_other_transfer;
+
+ /*
+ * Currently, this command is flagged as completed, ie
+ * it has valid status and message data. Reflag it as
+ * incomplete. Q - need to do something so that original
+ * status, etc are used.
+ */
+
+ cmd->cmd->result = 0xffff;
+
+ /*
+ * Restart command as a REQUEST SENSE.
+ */
+ hostdata->dsp = (u32 *) hostdata->script + hostdata->E_select /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ return SPECIFIC_INT_NOTHING;
+ case A_int_debug_break:
+ return SPECIFIC_INT_BREAK;
+ case A_int_norm_aborted:
+ hostdata->dsp = (u32 *) hostdata->schedule;
+ hostdata->dsp_changed = 1;
+ if (cmd)
+ abnormal_finished (cmd, DID_ERROR << 16);
+ return SPECIFIC_INT_NOTHING;
+ case A_int_norm_emulateintfly:
+ /* I'm not sure this is the right ! thing to do, but it works
+ * with the A4000T when copyback is disabled, and also the
+ * WarpEngine with copyback enabled, so it looks as though
+ * it does work to some extent.
+ *
+ * RGH: I don't really like it - You get an interrupt which
+ * calls NCR53c7x0_intr(), which calls this function (via
+ * intr_dma()), which calls NCR53c7x0_intr().....
+ * Anyway lets see how it goes for now.
+ */
+ hostdata->emulated_intfly = 1;
+ NCR53c7x0_intr(host->irq, NULL, NULL);
+ return SPECIFIC_INT_NOTHING;
+ case A_int_test_1:
+ case A_int_test_2:
+ hostdata->idle = 1;
+ hostdata->test_completed = (dsps - A_int_test_1) / 0x00010000 + 1;
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk("scsi%d : test%d complete\n", host->host_no,
+ hostdata->test_completed);
+ return SPECIFIC_INT_NOTHING;
+#ifdef A_int_debug_reselected_ok
+ case A_int_debug_reselected_ok:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
+ OPTION_DEBUG_DISCONNECT)) {
+ /*
+ * Note - this dsa is not based on location relative to
+ * the command structure, but to location relative to the
+ * DSA register
+ */
+ u32 *dsa;
+ dsa = (u32 *) bus_to_virt (NCR53c7x0_read32(DSA_REG));
+
+ printk("scsi%d : reselected_ok (DSA = 0x%x (virt 0x%p)\n",
+ host->host_no, NCR53c7x0_read32(DSA_REG), dsa);
+ printk("scsi%d : resume address is 0x%x (virt 0x%p)\n",
+ host->host_no, cmd->saved_data_pointer,
+ bus_to_virt(cmd->saved_data_pointer));
+ print_insn (host, hostdata->script + Ent_reselected_ok /
+ sizeof(u32), "", 1);
+ if ((hostdata->chip / 100) == 8)
+ printk ("scsi%d : sxfer=0x%x, scntl3=0x%x\n",
+ host->host_no, NCR53c7x0_read8(SXFER_REG),
+ NCR53c7x0_read8(SCNTL3_REG_800));
+ else
+ printk ("scsi%d : sxfer=0x%x, cannot read SBCL\n",
+ host->host_no, NCR53c7x0_read8(SXFER_REG));
+ if (c) {
+ print_insn (host, (u32 *)
+ hostdata->sync[c->target].script, "", 1);
+ print_insn (host, (u32 *)
+ hostdata->sync[c->target].script + 2, "", 1);
+ }
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_reselect_check
+ case A_int_debug_reselect_check:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
+ u32 *dsa;
+#if 0
+ u32 *code;
+#endif
+ /*
+ * Note - this dsa is not based on location relative to
+ * the command structure, but to location relative to the
+ * DSA register
+ */
+ dsa = bus_to_virt (NCR53c7x0_read32(DSA_REG));
+ printk("scsi%d : reselected_check_next (DSA = 0x%lx (virt 0x%p))\n",
+ host->host_no, virt_to_bus(dsa), dsa);
+ if (dsa) {
+ printk("scsi%d : resume address is 0x%x (virt 0x%p)\n",
+ host->host_no, cmd->saved_data_pointer,
+ bus_to_virt (cmd->saved_data_pointer));
+#if 0
+ printk("scsi%d : template code :\n", host->host_no);
+ for (code = dsa + (Ent_dsa_code_check_reselect - Ent_dsa_zero)
+ / sizeof(u32); code < (dsa + Ent_dsa_zero / sizeof(u32));
+ code += print_insn (host, code, "", 1));
+#endif
+ }
+ print_insn (host, hostdata->script + Ent_reselected_ok /
+ sizeof(u32), "", 1);
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_dsa_schedule
+ case A_int_debug_dsa_schedule:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
+ u32 *dsa;
+ /*
+ * Note - this dsa is not based on location relative to
+ * the command structure, but to location relative to the
+ * DSA register
+ */
+ dsa = (u32 *) bus_to_virt (NCR53c7x0_read32(DSA_REG));
+ printk("scsi%d : dsa_schedule (old DSA = 0x%lx (virt 0x%p))\n",
+ host->host_no, virt_to_bus(dsa), dsa);
+ if (dsa)
+ printk("scsi%d : resume address is 0x%x (virt 0x%p)\n"
+ " (temp was 0x%x (virt 0x%p))\n",
+ host->host_no, cmd->saved_data_pointer,
+ bus_to_virt (cmd->saved_data_pointer),
+ NCR53c7x0_read32 (TEMP_REG),
+ bus_to_virt (NCR53c7x0_read32(TEMP_REG)));
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_scheduled
+ case A_int_debug_scheduled:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
+ printk("scsi%d : new I/O 0x%x (virt 0x%p) scheduled\n",
+ host->host_no, NCR53c7x0_read32(DSA_REG),
+ bus_to_virt(NCR53c7x0_read32(DSA_REG)));
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_idle
+ case A_int_debug_idle:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
+ printk("scsi%d : idle\n", host->host_no);
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_cmd
+ case A_int_debug_cmd:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
+ printk("scsi%d : command sent\n");
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_dsa_loaded
+ case A_int_debug_dsa_loaded:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
+ printk("scsi%d : DSA loaded with 0x%x (virt 0x%p)\n", host->host_no,
+ NCR53c7x0_read32(DSA_REG),
+ bus_to_virt(NCR53c7x0_read32(DSA_REG)));
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_reselected
+ case A_int_debug_reselected:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
+ OPTION_DEBUG_DISCONNECT)) {
+ if ((hostdata->chip / 100) == 8)
+ printk("scsi%d : reselected by target %d lun %d\n",
+ host->host_no, (int) NCR53c7x0_read8(SDID_REG_800) & ~0x80,
+ (int) hostdata->reselected_identify & 7);
+ else
+ printk("scsi%d : reselected by LCRC=0x%02x lun %d\n",
+ host->host_no, (int) NCR53c7x0_read8(LCRC_REG_10),
+ (int) hostdata->reselected_identify & 7);
+ print_queues(host);
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_disconnect_msg
+ case A_int_debug_disconnect_msg:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
+ if (c)
+ printk("scsi%d : target %d lun %d disconnecting\n",
+ host->host_no, c->target, c->lun);
+ else
+ printk("scsi%d : unknown target disconnecting\n",
+ host->host_no);
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_disconnected
+ case A_int_debug_disconnected:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
+ OPTION_DEBUG_DISCONNECT)) {
+ printk ("scsi%d : disconnected, new queues are\n",
+ host->host_no);
+ print_queues(host);
+#if 0
+ /* Not valid on ncr53c710! */
+ printk ("scsi%d : sxfer=0x%x, scntl3=0x%x\n",
+ host->host_no, NCR53c7x0_read8(SXFER_REG),
+ NCR53c7x0_read8(SCNTL3_REG_800));
+#endif
+ if (c) {
+ print_insn (host, (u32 *)
+ hostdata->sync[c->target].script, "", 1);
+ print_insn (host, (u32 *)
+ hostdata->sync[c->target].script + 2, "", 1);
+ }
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_panic
+ case A_int_debug_panic:
+ printk("scsi%d : int_debug_panic received\n", host->host_no);
+ print_lots (host);
+ return SPECIFIC_INT_PANIC;
+#endif
+#ifdef A_int_debug_saved
+ case A_int_debug_saved:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
+ OPTION_DEBUG_DISCONNECT)) {
+ printk ("scsi%d : saved data pointer 0x%x (virt 0x%p)\n",
+ host->host_no, cmd->saved_data_pointer,
+ bus_to_virt (cmd->saved_data_pointer));
+ print_progress (c);
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_restored
+ case A_int_debug_restored:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
+ OPTION_DEBUG_DISCONNECT)) {
+ if (cmd) {
+ int size;
+ printk ("scsi%d : restored data pointer 0x%x (virt 0x%p)\n",
+ host->host_no, cmd->saved_data_pointer, bus_to_virt (
+ cmd->saved_data_pointer));
+ size = print_insn (host, (u32 *)
+ bus_to_virt(cmd->saved_data_pointer), "", 1);
+ size = print_insn (host, (u32 *)
+ bus_to_virt(cmd->saved_data_pointer) + size, "", 1);
+ print_progress (c);
+ }
+#if 0
+ printk ("scsi%d : datapath residual %d\n",
+ host->host_no, datapath_residual (host)) ;
+#endif
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_sync
+ case A_int_debug_sync:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
+ OPTION_DEBUG_DISCONNECT|OPTION_DEBUG_SDTR)) {
+ unsigned char sxfer = NCR53c7x0_read8 (SXFER_REG), scntl3;
+ if ((hostdata->chip / 100) == 8) {
+ scntl3 = NCR53c7x0_read8 (SCNTL3_REG_800);
+ if (c) {
+ if (sxfer != hostdata->sync[c->target].sxfer_sanity ||
+ scntl3 != hostdata->sync[c->target].scntl3_sanity) {
+ printk ("scsi%d : sync sanity check failed sxfer=0x%x, scntl3=0x%x",
+ host->host_no, sxfer, scntl3);
+ NCR53c7x0_write8 (SXFER_REG, sxfer);
+ NCR53c7x0_write8 (SCNTL3_REG_800, scntl3);
+ }
+ } else
+ printk ("scsi%d : unknown command sxfer=0x%x, scntl3=0x%x\n",
+ host->host_no, (int) sxfer, (int) scntl3);
+ } else {
+ if (c) {
+ if (sxfer != hostdata->sync[c->target].sxfer_sanity) {
+ printk ("scsi%d : sync sanity check failed sxfer=0x%x",
+ host->host_no, sxfer);
+ NCR53c7x0_write8 (SXFER_REG, sxfer);
+ NCR53c7x0_write8 (SBCL_REG,
+ hostdata->sync[c->target].sscf_710);
+ }
+ } else
+ printk ("scsi%d : unknown command sxfer=0x%x\n",
+ host->host_no, (int) sxfer);
+ }
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_datain
+ case A_int_debug_datain:
+ if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
+ OPTION_DEBUG_DISCONNECT|OPTION_DEBUG_SDTR)) {
+ int size;
+ if ((hostdata->chip / 100) == 8)
+ printk ("scsi%d : In do_datain (%s) sxfer=0x%x, scntl3=0x%x\n"
+ " datapath residual=%d\n",
+ host->host_no, sbcl_to_phase (NCR53c7x0_read8 (SBCL_REG)),
+ (int) NCR53c7x0_read8(SXFER_REG),
+ (int) NCR53c7x0_read8(SCNTL3_REG_800),
+ datapath_residual (host)) ;
+ else
+ printk ("scsi%d : In do_datain (%s) sxfer=0x%x\n"
+ " datapath residual=%d\n",
+ host->host_no, sbcl_to_phase (NCR53c7x0_read8 (SBCL_REG)),
+ (int) NCR53c7x0_read8(SXFER_REG),
+ datapath_residual (host)) ;
+ print_insn (host, dsp, "", 1);
+ size = print_insn (host, (u32 *) bus_to_virt(dsp[1]), "", 1);
+ print_insn (host, (u32 *) bus_to_virt(dsp[1]) + size, "", 1);
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+#ifdef A_int_debug_check_dsa
+ case A_int_debug_check_dsa:
+ if (NCR53c7x0_read8 (SCNTL1_REG) & SCNTL1_CON) {
+ int sdid;
+ int tmp;
+ char *where;
+ if (hostdata->chip / 100 == 8)
+ sdid = NCR53c7x0_read8 (SDID_REG_800) & 15;
+ else {
+ tmp = NCR53c7x0_read8 (SDID_REG_700);
+ if (!tmp)
+ panic ("SDID_REG_700 = 0");
+ tmp >>= 1;
+ sdid = 0;
+ while (tmp) {
+ tmp >>= 1;
+ sdid++;
+ }
+ }
+ where = dsp - NCR53c7x0_insn_size(NCR53c7x0_read8
+ (DCMD_REG)) == hostdata->script +
+ Ent_select_check_dsa / sizeof(u32) ?
+ "selection" : "reselection";
+ if (c && sdid != c->target) {
+ printk ("scsi%d : SDID target %d != DSA target %d at %s\n",
+ host->host_no, sdid, c->target, where);
+ print_lots(host);
+ dump_events (host, 20);
+ return SPECIFIC_INT_PANIC;
+ }
+ }
+ return SPECIFIC_INT_RESTART;
+#endif
+ default:
+ if ((dsps & 0xff000000) == 0x03000000) {
+ printk ("scsi%d : misc debug interrupt 0x%x\n",
+ host->host_no, dsps);
+ return SPECIFIC_INT_RESTART;
+ } else if ((dsps & 0xff000000) == 0x05000000) {
+ if (hostdata->events) {
+ struct NCR53c7x0_event *event;
+ ++hostdata->event_index;
+ if (hostdata->event_index >= hostdata->event_size)
+ hostdata->event_index = 0;
+ event = (struct NCR53c7x0_event *) hostdata->events +
+ hostdata->event_index;
+ event->event = (enum ncr_event) dsps;
+ event->dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
+ if (NCR53c7x0_read8 (SCNTL1_REG) & SCNTL1_CON) {
+ if (hostdata->chip / 100 == 8)
+ event->target = NCR53c7x0_read8(SSID_REG_800);
+ else {
+ unsigned char tmp, sdid;
+ tmp = NCR53c7x0_read8 (SDID_REG_700);
+ if (!tmp)
+ panic ("SDID_REG_700 = 0");
+ tmp >>= 1;
+ sdid = 0;
+ while (tmp) {
+ tmp >>= 1;
+ sdid++;
+ }
+ event->target = sdid;
+ }
+ }
+ else
+ event->target = 255;
+
+ if (event->event == EVENT_RESELECT)
+ event->lun = hostdata->reselected_identify & 0xf;
+ else if (c)
+ event->lun = c->lun;
+ else
+ event->lun = 255;
+ do_gettimeofday(&(event->time));
+ if (c) {
+ event->pid = c->pid;
+ memcpy ((void *) event->cmnd, (void *) c->cmnd,
+ sizeof (event->cmnd));
+ } else {
+ event->pid = -1;
+ }
+ }
+ return SPECIFIC_INT_RESTART;
+ }
+
+ printk ("scsi%d : unknown user interrupt 0x%x\n",
+ host->host_no, (unsigned) dsps);
+ return SPECIFIC_INT_PANIC;
+ }
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+}
+
+/*
+ * XXX - the stock NCR assembler won't output the scriptu.h file,
+ * which undefine's all #define'd CPP symbols from the script.h
+ * file, which will create problems if you use multiple scripts
+ * with the same symbol names.
+ *
+ * If you insist on using NCR's assembler, you could generate
+ * scriptu.h from script.h using something like
+ *
+ * grep #define script.h | \
+ * sed 's/#define[ ][ ]*\([_a-zA-Z][_a-zA-Z0-9]*\).*$/#undefine \1/' \
+ * > scriptu.h
+ */
+
+#include "53c7xx_u.h"
+
+/* XXX - add alternate script handling code here */
+
+
+/*
+ * Function : static void NCR537xx_soft_reset (struct Scsi_Host *host)
+ *
+ * Purpose : perform a soft reset of the NCR53c7xx chip
+ *
+ * Inputs : host - pointer to this host adapter's structure
+ *
+ * Preconditions : NCR53c7x0_init must have been called for this
+ * host.
+ *
+ */
+
+static void
+NCR53c7x0_soft_reset (struct Scsi_Host *host) {
+ NCR53c7x0_local_declare();
+ unsigned long flags;
+#ifdef CONFIG_MVME166
+ volatile unsigned long v;
+#endif
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ NCR53c7x0_local_setup(host);
+
+ save_flags(flags);
+ cli();
+
+ /* Disable scsi chip and s/w level 7 ints */
+
+#ifdef CONFIG_MVME166
+ v = *(volatile unsigned long *)0xfff4006c;
+ v &= ~0x8000;
+ *(volatile unsigned long *)0xfff4006c = v;
+ v = *(volatile unsigned long *)0xfff4202c;
+ v &= ~0x10;
+ *(volatile unsigned long *)0xfff4202c = v;
+#else
+ /* Anything specific for your hardware? */
+#endif
+
+ /*
+ * Do a soft reset of the chip so that everything is
+ * reinitialized to the power-on state.
+ *
+ * Basically follow the procedure outlined in the NCR53c700
+ * data manual under Chapter Six, How to Use, Steps Necessary to
+ * Start SCRIPTS, with the exception of actually starting the
+ * script and setting up the synchronous transfer gunk.
+ */
+
+ /* Should we reset the scsi bus here??????????????????? */
+
+ NCR53c7x0_write8(ISTAT_REG_700, ISTAT_10_SRST);
+ NCR53c7x0_write8(ISTAT_REG_700, 0);
+
+ /*
+ * saved_dcntl is set up in NCR53c7x0_init() before it is overwritten
+ * here. We should have some better way of working out the CF bit
+ * setting..
+ */
+
+ hostdata->saved_dcntl = DCNTL_10_EA|DCNTL_10_COM;
+ if (hostdata->scsi_clock > 50000000)
+ hostdata->saved_dcntl |= DCNTL_700_CF_3;
+ else
+ if (hostdata->scsi_clock > 37500000)
+ hostdata->saved_dcntl |= DCNTL_700_CF_2;
+#if 0
+ else
+ /* Any clocks less than 37.5MHz? */
+#endif
+
+ if (hostdata->options & OPTION_DEBUG_TRACE)
+ NCR53c7x0_write8(DCNTL_REG, hostdata->saved_dcntl | DCNTL_SSM);
+ else
+ NCR53c7x0_write8(DCNTL_REG, hostdata->saved_dcntl);
+#if 0
+ /* Following disables snooping - run with caches disabled at first */
+ NCR53c7x0_write8(CTEST7_REG, CTEST7_10_TT1|CTEST7_STD);
+#else
+ /* Setup CTEST7 for SC1=0, SC0=1 - sink/source data without invalidating
+ * cache lines. */
+ NCR53c7x0_write8(CTEST7_REG, CTEST7_10_TT1|CTEST7_STD|CTEST7_10_SC0);
+#endif
+ /* Actually burst of eight, according to my 53c710 databook */
+ NCR53c7x0_write8(hostdata->dmode, DMODE_10_BL_8 | DMODE_10_FC2);
+ NCR53c7x0_write8(SCID_REG, 1 << host->this_id);
+ NCR53c7x0_write8(SBCL_REG, 0);
+ NCR53c7x0_write8(SCNTL1_REG, SCNTL1_ESR_700);
+ NCR53c7x0_write8(SCNTL0_REG, ((hostdata->options & OPTION_PARITY) ?
+ SCNTL0_EPC : 0) | SCNTL0_EPG_700 | SCNTL0_ARB1 | SCNTL0_ARB2);
+
+ /*
+ * Enable all interrupts, except parity which we only want when
+ * the user requests it.
+ */
+
+ NCR53c7x0_write8(DIEN_REG, DIEN_700_BF |
+ DIEN_ABRT | DIEN_SSI | DIEN_SIR | DIEN_700_OPC);
+
+ NCR53c7x0_write8(SIEN_REG_700, ((hostdata->options & OPTION_PARITY) ?
+ SIEN_PAR : 0) | SIEN_700_STO | SIEN_RST | SIEN_UDC |
+ SIEN_SGE | SIEN_MA);
+
+#ifdef CONFIG_MVME166
+ /* Enable scsi chip and s/w level 7 ints */
+
+ v = *(volatile unsigned long *)0xfff40080;
+ v = (v & ~(0xf << 28)) | (4 << 28);
+ *(volatile unsigned long *)0xfff40080 = v;
+ v = *(volatile unsigned long *)0xfff4006c;
+ v |= 0x8000;
+ *(volatile unsigned long *)0xfff4006c = v;
+ v = *(volatile unsigned long *)0xfff4202c;
+ v = (v & ~0xff) | 0x10 | 4;
+ *(volatile unsigned long *)0xfff4202c = v;
+#else
+ /* Anything needed for your hardware */
+#endif
+ restore_flags(flags);
+}
+
+
+/*
+ * Function static struct NCR53c7x0_cmd *allocate_cmd (Scsi_Cmnd *cmd)
+ *
+ * Purpose : Return the first free NCR53c7x0_cmd structure (which are
+ * reused in a LIFO manner to minimize cache thrashing).
+ *
+ * Side effects : If we haven't yet scheduled allocation of NCR53c7x0_cmd
+ * structures for this device, do so. Attempt to complete all scheduled
+ * allocations using kmalloc(), putting NCR53c7x0_cmd structures on
+ * the free list. Teach programmers not to drink and hack.
+ *
+ * Inputs : cmd - SCSI command
+ *
+ * Returns : NCR53c7x0_cmd structure allocated on behalf of cmd;
+ * NULL on failure.
+ */
+
+static struct NCR53c7x0_cmd *
+allocate_cmd (Scsi_Cmnd *cmd) {
+ struct Scsi_Host *host = cmd->host;
+ struct NCR53c7x0_hostdata *hostdata =
+ (struct NCR53c7x0_hostdata *) host->hostdata;
+ void *real; /* Real address */
+ int size; /* Size of *tmp */
+ struct NCR53c7x0_cmd *tmp;
+ unsigned long flags;
+
+ if (hostdata->options & OPTION_DEBUG_ALLOCATION)
+ printk ("scsi%d : num_cmds = %d, can_queue = %d\n"
+ " target = %d, lun = %d, %s\n",
+ host->host_no, hostdata->num_cmds, host->can_queue,
+ cmd->target, cmd->lun, (hostdata->cmd_allocated[cmd->target] &
+ (1 << cmd->lun)) ? "already allocated" : "not allocated");
+
+/*
+ * If we have not yet reserved commands for this I_T_L nexus, and
+ * the device exists (as indicated by permanent Scsi_Cmnd structures
+ * being allocated under 1.3.x, or being outside of scan_scsis in
+ * 1.2.x), do so now.
+ */
+ if (!(hostdata->cmd_allocated[cmd->target] & (1 << cmd->lun)) &&
+ cmd->device && cmd->device->has_cmdblocks) {
+ if ((hostdata->extra_allocate + hostdata->num_cmds) < host->can_queue)
+ hostdata->extra_allocate += host->cmd_per_lun;
+ hostdata->cmd_allocated[cmd->target] |= (1 << cmd->lun);
+ }
+
+ for (; hostdata->extra_allocate > 0 ; --hostdata->extra_allocate,
+ ++hostdata->num_cmds) {
+ /* historically, kmalloc has returned unaligned addresses; pad so we
+ have enough room to ROUNDUP */
+ size = hostdata->max_cmd_size + sizeof (void *);
+#ifdef FORCE_DSA_ALIGNMENT
+ /*
+ * 53c710 rev.0 doesn't have an add-with-carry instruction.
+ * Ensure we allocate enough memory to force alignment.
+ */
+ size += 256;
+#endif
+/* FIXME: for ISA bus '7xx chips, we need to or GFP_DMA in here */
+ real = kmalloc (size, GFP_ATOMIC);
+ if (!real) {
+ if (hostdata->options & OPTION_DEBUG_ALLOCATION)
+ printk ("scsi%d : kmalloc(%d) failed\n",
+ host->host_no, size);
+ break;
+ }
+ tmp = ROUNDUP(real, void *);
+#ifdef FORCE_DSA_ALIGNMENT
+ {
+ if (((u32)tmp & 0xff) > CmdPageStart)
+ tmp = (struct NCR53c7x0_cmd *)((u32)tmp + 255);
+ tmp = (struct NCR53c7x0_cmd *)(((u32)tmp & ~0xff) + CmdPageStart);
+#ifdef DEBUG
+ printk ("scsi: size = %d, real = 0x%08x, tmp set to 0x%08x\n",
+ size, (u32)real, (u32)tmp);
+#endif
+ }
+#endif
+ tmp->real = real;
+ tmp->size = size;
+ tmp->free = ((void (*)(void *, int)) kfree);
+ save_flags (flags);
+ cli();
+ tmp->next = hostdata->free;
+ hostdata->free = tmp;
+ restore_flags (flags);
+ }
+ save_flags(flags);
+ cli();
+ tmp = (struct NCR53c7x0_cmd *) hostdata->free;
+ if (tmp) {
+ hostdata->free = tmp->next;
+ }
+ restore_flags(flags);
+ if (!tmp)
+ printk ("scsi%d : can't allocate command for target %d lun %d\n",
+ host->host_no, cmd->target, cmd->lun);
+ return tmp;
+}
+
+/*
+ * Function static struct NCR53c7x0_cmd *create_cmd (Scsi_Cmnd *cmd)
+ *
+ *
+ * Purpose : allocate a NCR53c7x0_cmd structure, initialize it based on the
+ * Scsi_Cmnd structure passed in cmd, including dsa and Linux field
+ * initialization, and dsa code relocation.
+ *
+ * Inputs : cmd - SCSI command
+ *
+ * Returns : NCR53c7x0_cmd structure corresponding to cmd,
+ * NULL on failure.
+ */
+static struct NCR53c7x0_cmd *
+create_cmd (Scsi_Cmnd *cmd) {
+ NCR53c7x0_local_declare();
+ struct Scsi_Host *host = cmd->host;
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ struct NCR53c7x0_cmd *tmp; /* NCR53c7x0_cmd structure for this command */
+ int datain, /* Number of instructions per phase */
+ dataout;
+ int data_transfer_instructions, /* Count of dynamic instructions */
+ i; /* Counter */
+ u32 *cmd_datain, /* Address of datain/dataout code */
+ *cmd_dataout; /* Incremented as we assemble */
+#ifdef notyet
+ unsigned char *msgptr; /* Current byte in select message */
+ int msglen; /* Length of whole select message */
+#endif
+ unsigned long flags;
+ u32 exp_select_indirect; /* Used in sanity check */
+ NCR53c7x0_local_setup(cmd->host);
+
+ if (!(tmp = allocate_cmd (cmd)))
+ return NULL;
+
+
+ /*
+ * Decide whether we need to generate commands for DATA IN,
+ * DATA OUT, neither, or both based on the SCSI command
+ */
+
+ switch (cmd->cmnd[0]) {
+ /* These commands do DATA IN */
+ case INQUIRY:
+ case MODE_SENSE:
+ case READ_6:
+ case READ_10:
+ case READ_CAPACITY:
+ case REQUEST_SENSE:
+ datain = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
+ dataout = 0;
+ break;
+ /* These commands do DATA OUT */
+ case MODE_SELECT:
+ case WRITE_6:
+ case WRITE_10:
+ case START_STOP: /* also SCAN, which may do DATA OUT */
+#if 0
+ printk("scsi%d : command is ", host->host_no);
+ print_command(cmd->cmnd);
+#endif
+#if 0
+ printk ("scsi%d : %d scatter/gather segments\n", host->host_no,
+ cmd->use_sg);
+#endif
+ datain = 0;
+ dataout = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
+#if 0
+ hostdata->options |= OPTION_DEBUG_INTR;
+#endif
+ break;
+ /*
+ * These commands do no data transfer, we should force an
+ * interrupt if a data phase is attempted on them.
+ */
+ case TEST_UNIT_READY:
+ datain = dataout = 0;
+ break;
+ /*
+ * We don't know about these commands, so generate code to handle
+ * both DATA IN and DATA OUT phases.
+ */
+ default:
+ datain = dataout = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
+ }
+
+ /*
+ * New code : so that active pointers work correctly regardless
+ * of where the saved data pointer is at, we want to immediately
+ * enter the dynamic code after selection, and on a non-data
+ * phase perform a CALL to the non-data phase handler, with
+ * returns back to this address.
+ *
+ * If a phase mismatch is encountered in the middle of a
+ * Block MOVE instruction, we want to _leave_ that instruction
+ * unchanged as the current case is, modify a temporary buffer,
+ * and point the active pointer (TEMP) at that.
+ *
+ * Furthermore, we want to implement a saved data pointer,
+ * set by the SAVE_DATA_POINTERs message.
+ *
+ * So, the data transfer segments will change to
+ * CALL data_transfer, WHEN NOT data phase
+ * MOVE x, x, WHEN data phase
+ * ( repeat )
+ * JUMP other_transfer
+ */
+
+ data_transfer_instructions = datain + dataout;
+
+ /*
+ * When we perform a request sense, we overwrite various things,
+ * including the data transfer code. Make sure we have enough
+ * space to do that.
+ */
+
+ if (data_transfer_instructions < 2)
+ data_transfer_instructions = 2;
+
+
+ /*
+ * The saved data pointer is set up so that a RESTORE POINTERS message
+ * will start the data transfer over at the begining.
+ */
+
+ tmp->saved_data_pointer = virt_to_bus (hostdata->script) +
+ hostdata->E_data_transfer;
+
+ /*
+ * Initialize Linux specific fields.
+ */
+
+ tmp->cmd = cmd;
+ tmp->next = NULL;
+ tmp->flags = 0;
+ tmp->dsa_next_addr = virt_to_bus(tmp->dsa) + hostdata->dsa_next -
+ hostdata->dsa_start;
+ tmp->dsa_addr = virt_to_bus(tmp->dsa) - hostdata->dsa_start;
+
+ /*
+ * Calculate addresses of dynamic code to fill in DSA
+ */
+
+ tmp->data_transfer_start = tmp->dsa + (hostdata->dsa_end -
+ hostdata->dsa_start) / sizeof(u32);
+ tmp->data_transfer_end = tmp->data_transfer_start +
+ 2 * data_transfer_instructions;
+
+ cmd_datain = datain ? tmp->data_transfer_start : NULL;
+ cmd_dataout = dataout ? (datain ? cmd_datain + 2 * datain : tmp->
+ data_transfer_start) : NULL;
+
+ /*
+ * Fill in the NCR53c7x0_cmd structure as follows
+ * dsa, with fixed up DSA code
+ * datain code
+ * dataout code
+ */
+
+ /* Copy template code into dsa and perform all necessary fixups */
+ if (hostdata->dsa_fixup)
+ hostdata->dsa_fixup(tmp);
+
+ patch_dsa_32(tmp->dsa, dsa_next, 0, 0);
+ patch_dsa_32(tmp->dsa, dsa_cmnd, 0, virt_to_bus(cmd));
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+
+ if (hostdata->options & OPTION_DEBUG_SYNCHRONOUS) {
+
+ exp_select_indirect = ((1 << cmd->target) << 16) |
+ (hostdata->sync[cmd->target].sxfer_sanity << 8);
+
+ if (hostdata->sync[cmd->target].select_indirect !=
+ exp_select_indirect) {
+ printk ("scsi%d : sanity check failed select_indirect=0x%x\n",
+ host->host_no, hostdata->sync[cmd->target].select_indirect);
+ FATAL(host);
+
+ }
+ }
+
+ patch_dsa_32(tmp->dsa, dsa_select, 0,
+ hostdata->sync[cmd->target].select_indirect);
+
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+
+ /*
+ * Right now, we'll do the WIDE and SYNCHRONOUS negotiations on
+ * different commands; although it should be trivial to do them
+ * both at the same time.
+ */
+ if (hostdata->initiate_wdtr & (1 << cmd->target)) {
+ memcpy ((void *) (tmp->select + 1), (void *) wdtr_message,
+ sizeof(wdtr_message));
+ patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1 + sizeof(wdtr_message));
+ save_flags(flags);
+ cli();
+ hostdata->initiate_wdtr &= ~(1 << cmd->target);
+ restore_flags(flags);
+ } else if (hostdata->initiate_sdtr & (1 << cmd->target)) {
+ memcpy ((void *) (tmp->select + 1), (void *) sdtr_message,
+ sizeof(sdtr_message));
+ patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1 + sizeof(sdtr_message));
+ tmp->flags |= CMD_FLAG_SDTR;
+ save_flags(flags);
+ cli();
+ hostdata->initiate_sdtr &= ~(1 << cmd->target);
+ restore_flags(flags);
+
+ }
+#if 1
+ else if (!(hostdata->talked_to & (1 << cmd->target)) &&
+ !(hostdata->options & OPTION_NO_ASYNC)) {
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+
+ memcpy ((void *) (tmp->select + 1), (void *) async_message,
+ sizeof(async_message));
+ patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1 + sizeof(async_message));
+ tmp->flags |= CMD_FLAG_SDTR;
+ }
+#endif
+ else
+ patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1);
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+
+ hostdata->talked_to |= (1 << cmd->target);
+ tmp->select[0] = (hostdata->options & OPTION_DISCONNECT) ?
+ IDENTIFY (1, cmd->lun) : IDENTIFY (0, cmd->lun);
+ patch_dsa_32(tmp->dsa, dsa_msgout, 1, virt_to_bus(tmp->select));
+ patch_dsa_32(tmp->dsa, dsa_cmdout, 0, cmd->cmd_len);
+ patch_dsa_32(tmp->dsa, dsa_cmdout, 1, virt_to_bus(cmd->cmnd));
+ patch_dsa_32(tmp->dsa, dsa_dataout, 0, cmd_dataout ?
+ virt_to_bus (cmd_dataout)
+ : virt_to_bus (hostdata->script) + hostdata->E_other_transfer);
+ patch_dsa_32(tmp->dsa, dsa_datain, 0, cmd_datain ?
+ virt_to_bus (cmd_datain)
+ : virt_to_bus (hostdata->script) + hostdata->E_other_transfer);
+ /*
+ * XXX - need to make endian aware, should use separate variables
+ * for both status and message bytes.
+ */
+ patch_dsa_32(tmp->dsa, dsa_msgin, 0, 1);
+/*
+ * FIXME : these only works for little endian. We probably want to
+ * provide message and status fields in the NCR53c7x0_cmd
+ * structure, and assign them to cmd->result when we're done.
+ */
+#ifdef BIG_ENDIAN
+ patch_dsa_32(tmp->dsa, dsa_msgin, 1, virt_to_bus(&cmd->result) + 2);
+ patch_dsa_32(tmp->dsa, dsa_status, 0, 1);
+ patch_dsa_32(tmp->dsa, dsa_status, 1, virt_to_bus(&cmd->result) + 3);
+#else
+ patch_dsa_32(tmp->dsa, dsa_msgin, 1, virt_to_bus(&cmd->result) + 1);
+ patch_dsa_32(tmp->dsa, dsa_status, 0, 1);
+ patch_dsa_32(tmp->dsa, dsa_status, 1, virt_to_bus(&cmd->result));
+#endif
+ patch_dsa_32(tmp->dsa, dsa_msgout_other, 0, 1);
+ patch_dsa_32(tmp->dsa, dsa_msgout_other, 1,
+ virt_to_bus(&(hostdata->NCR53c7xx_msg_nop)));
+
+ /*
+ * Generate code for zero or more of the DATA IN, DATA OUT phases
+ * in the format
+ *
+ * CALL data_transfer, WHEN NOT phase
+ * MOVE first buffer length, first buffer address, WHEN phase
+ * ...
+ * MOVE last buffer length, last buffer address, WHEN phase
+ * JUMP other_transfer
+ */
+
+/*
+ * See if we're getting to data transfer by generating an unconditional
+ * interrupt.
+ */
+#if 0
+ if (datain) {
+ cmd_datain[0] = 0x98080000;
+ cmd_datain[1] = 0x03ffd00d;
+ cmd_datain += 2;
+ }
+#endif
+
+/*
+ * XXX - I'm undecided whether all of this nonsense is faster
+ * in the long run, or whether I should just go and implement a loop
+ * on the NCR chip using table indirect mode?
+ *
+ * In any case, this is how it _must_ be done for 53c700/700-66 chips,
+ * so this stays even when we come up with something better.
+ *
+ * When we're limited to 1 simultaneous command, no overlapping processing,
+ * we're seeing 630K/sec, with 7% CPU usage on a slow Syquest 45M
+ * drive.
+ *
+ * Not bad, not good. We'll see.
+ */
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+
+
+ for (i = 0; cmd->use_sg ? (i < cmd->use_sg) : !i; cmd_datain += 4,
+ cmd_dataout += 4, ++i) {
+ u32 buf = cmd->use_sg ?
+ virt_to_bus(((struct scatterlist *)cmd->buffer)[i].address) :
+ virt_to_bus(cmd->request_buffer);
+ u32 count = cmd->use_sg ?
+ ((struct scatterlist *)cmd->buffer)[i].length :
+ cmd->request_bufflen;
+
+ if (datain) {
+ /* CALL other_in, WHEN NOT DATA_IN */
+ cmd_datain[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL |
+ DCMD_TCI_IO) << 24) |
+ DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE;
+ cmd_datain[1] = virt_to_bus (hostdata->script) +
+ hostdata->E_other_in;
+ /* MOVE count, buf, WHEN DATA_IN */
+ cmd_datain[2] = ((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I | DCMD_BMI_IO)
+ << 24) | count;
+ cmd_datain[3] = buf;
+#if 0
+ print_insn (host, cmd_datain, "dynamic ", 1);
+ print_insn (host, cmd_datain + 2, "dynamic ", 1);
+#endif
+ }
+ if (dataout) {
+ /* CALL other_out, WHEN NOT DATA_OUT */
+ cmd_dataout[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL) << 24) |
+ DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE;
+ cmd_dataout[1] = virt_to_bus(hostdata->script) +
+ hostdata->E_other_out;
+ /* MOVE count, buf, WHEN DATA+OUT */
+ cmd_dataout[2] = ((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I) << 24)
+ | count;
+ cmd_dataout[3] = buf;
+#if 0
+ print_insn (host, cmd_dataout, "dynamic ", 1);
+ print_insn (host, cmd_dataout + 2, "dynamic ", 1);
+#endif
+ }
+ }
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+
+
+ /*
+ * Install JUMP instructions after the data transfer routines to return
+ * control to the do_other_transfer routines.
+ */
+
+
+ if (datain) {
+ cmd_datain[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP) << 24) |
+ DBC_TCI_TRUE;
+ cmd_datain[1] = virt_to_bus(hostdata->script) +
+ hostdata->E_other_transfer;
+#if 0
+ print_insn (host, cmd_datain, "dynamic jump ", 1);
+#endif
+ cmd_datain += 2;
+ }
+#if 0
+ if (datain) {
+ cmd_datain[0] = 0x98080000;
+ cmd_datain[1] = 0x03ffdeed;
+ cmd_datain += 2;
+ }
+#endif
+ if (dataout) {
+ cmd_dataout[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP) << 24) |
+ DBC_TCI_TRUE;
+ cmd_dataout[1] = virt_to_bus(hostdata->script) +
+ hostdata->E_other_transfer;
+#if 0
+ print_insn (host, cmd_dataout, "dynamic jump ", 1);
+#endif
+ cmd_dataout += 2;
+ }
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+
+ return tmp;
+}
+
+/*
+ * Function : int NCR53c7xx_queue_command (Scsi_Cmnd *cmd,
+ * void (*done)(Scsi_Cmnd *))
+ *
+ * Purpose : enqueues a SCSI command
+ *
+ * Inputs : cmd - SCSI command, done - function called on completion, with
+ * a pointer to the command descriptor.
+ *
+ * Returns : 0
+ *
+ * Side effects :
+ * cmd is added to the per instance driver issue_queue, with major
+ * twiddling done to the host specific fields of cmd. If the
+ * process_issue_queue coroutine isn't running, it is restarted.
+ *
+ * NOTE : we use the host_scribble field of the Scsi_Cmnd structure to
+ * hold our own data, and pervert the ptr field of the SCp field
+ * to create a linked list.
+ */
+
+int
+NCR53c7xx_queue_command (Scsi_Cmnd *cmd, void (* done)(Scsi_Cmnd *)) {
+ struct Scsi_Host *host = cmd->host;
+ struct NCR53c7x0_hostdata *hostdata =
+ (struct NCR53c7x0_hostdata *) host->hostdata;
+ unsigned long flags;
+ Scsi_Cmnd *tmp;
+
+ cmd->scsi_done = done;
+ cmd->host_scribble = NULL;
+ cmd->SCp.ptr = NULL;
+ cmd->SCp.buffer = NULL;
+
+#ifdef VALID_IDS
+ /* Ignore commands on invalid IDs */
+ if (!hostdata->valid_ids[cmd->target]) {
+ printk("scsi%d : ignoring target %d lun %d\n", host->host_no,
+ cmd->target, cmd->lun);
+ cmd->result = (DID_BAD_TARGET << 16);
+ done(cmd);
+ return 0;
+ }
+#endif
+
+ save_flags(flags);
+ cli();
+ if ((hostdata->options & (OPTION_DEBUG_INIT_ONLY|OPTION_DEBUG_PROBE_ONLY))
+ || ((hostdata->options & OPTION_DEBUG_TARGET_LIMIT) &&
+ !(hostdata->debug_lun_limit[cmd->target] & (1 << cmd->lun)))
+#ifdef LINUX_1_2
+ || cmd->target > 7
+#else
+ || cmd->target > host->max_id
+#endif
+ || cmd->target == host->this_id
+ || hostdata->state == STATE_DISABLED) {
+ printk("scsi%d : disabled or bad target %d lun %d\n", host->host_no,
+ cmd->target, cmd->lun);
+ cmd->result = (DID_BAD_TARGET << 16);
+ done(cmd);
+ restore_flags (flags);
+ return 0;
+ }
+
+ if ((hostdata->options & OPTION_DEBUG_NCOMMANDS_LIMIT) &&
+ (hostdata->debug_count_limit == 0)) {
+ printk("scsi%d : maximum commands exceeded\n", host->host_no);
+ cmd->result = (DID_BAD_TARGET << 16);
+ done(cmd);
+ restore_flags (flags);
+ return 0;
+ }
+
+ if (hostdata->options & OPTION_DEBUG_READ_ONLY) {
+ switch (cmd->cmnd[0]) {
+ case WRITE_6:
+ case WRITE_10:
+ printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n",
+ host->host_no);
+ cmd->result = (DID_BAD_TARGET << 16);
+ done(cmd);
+ restore_flags (flags);
+ return 0;
+ }
+ }
+
+ if ((hostdata->options & OPTION_DEBUG_TARGET_LIMIT) &&
+ hostdata->debug_count_limit != -1)
+ --hostdata->debug_count_limit;
+
+ cmd->result = 0xffff; /* The NCR will overwrite message
+ and status with valid data */
+ cmd->host_scribble = (unsigned char *) tmp = create_cmd (cmd);
+
+ /*
+ * REQUEST SENSE commands are inserted at the head of the queue
+ * so that we do not clear the contingent allegiance condition
+ * they may be looking at.
+ */
+
+ if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
+ cmd->SCp.ptr = (unsigned char *) hostdata->issue_queue;
+ hostdata->issue_queue = cmd;
+ } else {
+ for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->SCp.ptr;
+ tmp = (Scsi_Cmnd *) tmp->SCp.ptr);
+ tmp->SCp.ptr = (unsigned char *) cmd;
+ }
+ restore_flags (flags);
+ run_process_issue_queue();
+ return 0;
+}
+
+/*
+ * Function : void to_schedule_list (struct Scsi_Host *host,
+ * struct NCR53c7x0_hostdata * hostdata, Scsi_Cmnd *cmd)
+ *
+ * Purpose : takes a SCSI command which was just removed from the
+ * issue queue, and deals with it by inserting it in the first
+ * free slot in the schedule list or by terminating it immediately.
+ *
+ * Inputs :
+ * host - SCSI host adapter; hostdata - hostdata structure for
+ * this adapter; cmd - a pointer to the command; should have
+ * the host_scribble field initialized to point to a valid
+ *
+ * Side effects :
+ * cmd is added to the per instance schedule list, with minor
+ * twiddling done to the host specific fields of cmd.
+ *
+ */
+
+static __inline__ void
+to_schedule_list (struct Scsi_Host *host, struct NCR53c7x0_hostdata *hostdata,
+ struct NCR53c7x0_cmd *cmd) {
+ NCR53c7x0_local_declare();
+ Scsi_Cmnd *tmp = cmd->cmd;
+ unsigned long flags;
+ /* dsa start is negative, so subtraction is used */
+ volatile u32 *ncrcurrent;
+
+ int i;
+ NCR53c7x0_local_setup(host);
+#if 0
+ printk("scsi%d : new dsa is 0x%lx (virt 0x%p)\n", host->host_no,
+ virt_to_bus(hostdata->dsa), hostdata->dsa);
+#endif
+
+ save_flags(flags);
+ cli();
+
+ /*
+ * Work around race condition : if an interrupt fired and we
+ * got disabled forget about this command.
+ */
+
+ if (hostdata->state == STATE_DISABLED) {
+ printk("scsi%d : driver disabled\n", host->host_no);
+ tmp->result = (DID_BAD_TARGET << 16);
+ cmd->next = (struct NCR53c7x0_cmd *) hostdata->free;
+ hostdata->free = cmd;
+ tmp->scsi_done(tmp);
+ restore_flags (flags);
+ return;
+ }
+
+ for (i = host->can_queue, ncrcurrent = hostdata->schedule;
+ i > 0 && ncrcurrent[0] != hostdata->NOP_insn;
+ --i, ncrcurrent += 2 /* JUMP instructions are two words */);
+
+
+flush_cache_all();
+cache_push(virt_to_bus(hostdata->script), flushsize);
+cache_clear(virt_to_bus(hostdata->script), flushsize);
+
+ if (i > 0) {
+ ++hostdata->busy[tmp->target][tmp->lun];
+ cmd->next = hostdata->running_list;
+ hostdata->running_list = cmd;
+
+ /* Restore this instruction to a NOP once the command starts */
+ cmd->dsa [(hostdata->dsa_jump_dest - hostdata->dsa_start) /
+ sizeof(u32)] = (u32) virt_to_bus ((void *)ncrcurrent);
+ /* Replace the current jump operand. */
+ ncrcurrent[1] =
+ virt_to_bus ((void *) cmd->dsa) + hostdata->E_dsa_code_begin -
+ hostdata->E_dsa_code_template;
+ /* Replace the NOP instruction with a JUMP */
+ ncrcurrent[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24) |
+ DBC_TCI_TRUE;
+ } else {
+ printk ("scsi%d: no free slot\n", host->host_no);
+ disable(host);
+ tmp->result = (DID_ERROR << 16);
+ cmd->next = (struct NCR53c7x0_cmd *) hostdata->free;
+ hostdata->free = cmd;
+ tmp->scsi_done(tmp);
+ restore_flags (flags);
+ return;
+ }
+
+ cache_push(virt_to_bus(cmd->dsa), hostdata->dsa_len);
+ cache_push(virt_to_bus(ncrcurrent), sizeof(ncrcurrent));
+
+ /*
+ * If the NCR chip is in an idle state, start it running the scheduler
+ * immediately. Otherwise, signal the chip to jump to schedule as
+ * soon as it is idle.
+ */
+
+ if (hostdata->idle) {
+ hostdata->idle = 0;
+ hostdata->state = STATE_RUNNING;
+ NCR53c7x0_write32 (DSP_REG, virt_to_bus ((void *)hostdata->schedule));
+ if (hostdata->options & OPTION_DEBUG_TRACE)
+ NCR53c7x0_write8 (DCNTL_REG, hostdata->saved_dcntl |
+ DCNTL_SSM | DCNTL_STD);
+ } else {
+ NCR53c7x0_write8(hostdata->istat, ISTAT_10_SIGP);
+ }
+
+ restore_flags(flags);
+}
+
+/*
+ * Function : busyp (struct Scsi_Host *host, struct NCR53c7x0_hostdata
+ * *hostdata, Scsi_Cmnd *cmd)
+ *
+ * Purpose : decide if we can pass the given SCSI command on to the
+ * device in question or not.
+ *
+ * Returns : non-zero when we're busy, 0 when we aren't.
+ */
+
+static __inline__ int
+busyp (struct Scsi_Host *host, struct NCR53c7x0_hostdata *hostdata,
+ Scsi_Cmnd *cmd) {
+ /* FIXME : in the future, this needs to accommodate SCSI-II tagged
+ queuing, and we may be able to play with fairness here a bit.
+ */
+ return hostdata->busy[cmd->target][cmd->lun];
+}
+
+/*
+ * Function : process_issue_queue (void)
+ *
+ * Purpose : transfer commands from the issue queue to NCR start queue
+ * of each NCR53c7/8xx in the system, avoiding kernel stack
+ * overflows when the scsi_done() function is invoked recursively.
+ *
+ * NOTE : process_issue_queue exits with interrupts *disabled*, so the
+ * caller must reenable them if it desires.
+ *
+ * NOTE : process_issue_queue should be called from both
+ * NCR53c7x0_queue_command() and from the interrupt handler
+ * after command completion in case NCR53c7x0_queue_command()
+ * isn't invoked again but we've freed up resources that are
+ * needed.
+ */
+
+static void
+process_issue_queue (unsigned long flags) {
+ Scsi_Cmnd *tmp, *prev;
+ struct Scsi_Host *host;
+ struct NCR53c7x0_hostdata *hostdata;
+ int done;
+
+ /*
+ * We run (with interrupts disabled) until we're sure that none of
+ * the host adapters have anything that can be done, at which point
+ * we set process_issue_queue_running to 0 and exit.
+ *
+ * Interrupts are enabled before doing various other internal
+ * instructions, after we've decided that we need to run through
+ * the loop again.
+ *
+ */
+
+ do {
+ cli(); /* Freeze request queues */
+ done = 1;
+ for (host = first_host; host && host->hostt == the_template;
+ host = host->next) {
+ hostdata = (struct NCR53c7x0_hostdata *) host->hostdata;
+ cli();
+ if (hostdata->issue_queue) {
+ if (hostdata->state == STATE_DISABLED) {
+ tmp = (Scsi_Cmnd *) hostdata->issue_queue;
+ hostdata->issue_queue = (Scsi_Cmnd *) tmp->SCp.ptr;
+ tmp->result = (DID_BAD_TARGET << 16);
+ if (tmp->host_scribble) {
+ ((struct NCR53c7x0_cmd *)tmp->host_scribble)->next =
+ hostdata->free;
+ hostdata->free =
+ (struct NCR53c7x0_cmd *)tmp->host_scribble;
+ tmp->host_scribble = NULL;
+ }
+ tmp->scsi_done (tmp);
+ done = 0;
+ } else
+ for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
+ prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *)
+ tmp->SCp.ptr)
+ if (!tmp->host_scribble ||
+ !busyp (host, hostdata, tmp)) {
+ if (prev)
+ prev->SCp.ptr = tmp->SCp.ptr;
+ else
+ hostdata->issue_queue = (Scsi_Cmnd *)
+ tmp->SCp.ptr;
+ tmp->SCp.ptr = NULL;
+ if (tmp->host_scribble) {
+ if (hostdata->options & OPTION_DEBUG_QUEUES)
+ printk ("scsi%d : moving command for target %d lun %d to start list\n",
+ host->host_no, tmp->target, tmp->lun);
+
+
+ to_schedule_list (host, hostdata,
+ (struct NCR53c7x0_cmd *)
+ tmp->host_scribble);
+ } else {
+ if (((tmp->result & 0xff) == 0xff) ||
+ ((tmp->result & 0xff00) == 0xff00)) {
+ printk ("scsi%d : danger Will Robinson!\n",
+ host->host_no);
+ tmp->result = DID_ERROR << 16;
+ disable (host);
+ }
+ tmp->scsi_done(tmp);
+ }
+ done = 0;
+ } /* if target/lun is not busy */
+ } /* if hostdata->issue_queue */
+ if (!done)
+ restore_flags (flags);
+ } /* for host */
+ } while (!done);
+ process_issue_queue_running = 0;
+}
+
+/*
+ * Function : static void intr_scsi (struct Scsi_Host *host,
+ * struct NCR53c7x0_cmd *cmd)
+ *
+ * Purpose : handle all SCSI interrupts, indicated by the setting
+ * of the SIP bit in the ISTAT register.
+ *
+ * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
+ * may be NULL.
+ */
+
+static void
+intr_scsi (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
+ NCR53c7x0_local_declare();
+ struct NCR53c7x0_hostdata *hostdata =
+ (struct NCR53c7x0_hostdata *) host->hostdata;
+ unsigned char sstat0_sist0, sist1, /* Registers */
+ fatal; /* Did a fatal interrupt
+ occur ? */
+
+ NCR53c7x0_local_setup(host);
+
+ fatal = 0;
+
+ sstat0_sist0 = NCR53c7x0_read8(SSTAT0_REG);
+ sist1 = 0;
+
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk ("scsi%d : SIST0 0x%0x, SIST1 0x%0x\n", host->host_no,
+ sstat0_sist0, sist1);
+
+ /* 250ms selection timeout */
+ if (sstat0_sist0 & SSTAT0_700_STO) {
+ fatal = 1;
+ if (hostdata->options & OPTION_DEBUG_INTR) {
+ printk ("scsi%d : Selection Timeout\n", host->host_no);
+ if (cmd) {
+ printk("scsi%d : target %d, lun %d, command ",
+ host->host_no, cmd->cmd->target, cmd->cmd->lun);
+ print_command (cmd->cmd->cmnd);
+ printk("scsi%d : dsp = 0x%x (virt 0x%p)\n", host->host_no,
+ NCR53c7x0_read32(DSP_REG),
+ bus_to_virt(NCR53c7x0_read32(DSP_REG)));
+ } else {
+ printk("scsi%d : no command\n", host->host_no);
+ }
+ }
+/*
+ * XXX - question : how do we want to handle the Illegal Instruction
+ * interrupt, which may occur before or after the Selection Timeout
+ * interrupt?
+ */
+
+ if (1) {
+ hostdata->idle = 1;
+ hostdata->expecting_sto = 0;
+
+ if (hostdata->test_running) {
+ hostdata->test_running = 0;
+ hostdata->test_completed = 3;
+ } else if (cmd) {
+ abnormal_finished(cmd, DID_BAD_TARGET << 16);
+ }
+#if 0
+ hostdata->intrs = 0;
+#endif
+ }
+ }
+
+/*
+ * FIXME : in theory, we can also get a UDC when a STO occurs.
+ */
+ if (sstat0_sist0 & SSTAT0_UDC) {
+ fatal = 1;
+ if (cmd) {
+ printk("scsi%d : target %d lun %d unexpected disconnect\n",
+ host->host_no, cmd->cmd->target, cmd->cmd->lun);
+ print_lots (host);
+ abnormal_finished(cmd, DID_ERROR << 16);
+ } else
+ printk("scsi%d : unexpected disconnect (no command)\n",
+ host->host_no);
+
+ hostdata->dsp = (u32 *) hostdata->schedule;
+ hostdata->dsp_changed = 1;
+ }
+
+ /* SCSI PARITY error */
+ if (sstat0_sist0 & SSTAT0_PAR) {
+ fatal = 1;
+ if (cmd && cmd->cmd) {
+ printk("scsi%d : target %d lun %d parity error.\n",
+ host->host_no, cmd->cmd->target, cmd->cmd->lun);
+ abnormal_finished (cmd, DID_PARITY << 16);
+ } else
+ printk("scsi%d : parity error\n", host->host_no);
+ /* Should send message out, parity error */
+
+ /* XXX - Reduce synchronous transfer rate! */
+ hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ /* SCSI GROSS error */
+ }
+
+ if (sstat0_sist0 & SSTAT0_SGE) {
+ fatal = 1;
+ printk("scsi%d : gross error, saved2_dsa = 0x%x\n", host->host_no,
+ (unsigned int)hostdata->saved2_dsa);
+ print_lots (host);
+
+ /*
+ * A SCSI gross error may occur when we have
+ *
+ * - A synchronous offset which causes the SCSI FIFO to be overwritten.
+ *
+ * - A REQ which causes the maximum synchronous offset programmed in
+ * the SXFER register to be exceeded.
+ *
+ * - A phase change with an outstanding synchronous offset.
+ *
+ * - Residual data in the synchronous data FIFO, with a transfer
+ * other than a synchronous receive is started.$#
+ */
+
+
+ /* XXX Should deduce synchronous transfer rate! */
+ hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ /* Phase mismatch */
+ }
+
+ if (sstat0_sist0 & SSTAT0_MA) {
+ fatal = 1;
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk ("scsi%d : SSTAT0_MA\n", host->host_no);
+ intr_phase_mismatch (host, cmd);
+ }
+
+#if 0
+ if (sstat0_sist0 & SIST0_800_RSL)
+ printk ("scsi%d : Oh no Mr. Bill!\n", host->host_no);
+#endif
+
+/*
+ * If a fatal SCSI interrupt occurs, we must insure that the DMA and
+ * SCSI FIFOs were flushed.
+ */
+
+ if (fatal) {
+ if (!hostdata->dstat_valid) {
+ hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
+ hostdata->dstat_valid = 1;
+ }
+
+ if (!(hostdata->dstat & DSTAT_DFE)) {
+ printk ("scsi%d : DMA FIFO not empty\n", host->host_no);
+ /*
+ * Really need to check this code for 710 RGH.
+ * Havn't seen any problems, but maybe we should FLUSH before
+ * clearing sometimes.
+ */
+ NCR53c7x0_write8 (CTEST8_REG, CTEST8_10_CLF);
+ while (NCR53c7x0_read8 (CTEST8_REG) & CTEST8_10_CLF)
+ ;
+ hostdata->dstat |= DSTAT_DFE;
+ }
+ }
+}
+
+#ifdef CYCLIC_TRACE
+
+/*
+ * The following implements a cyclic log of instructions executed, if you turn
+ * TRACE on. It will also print the log for you. Very useful when debugging
+ * 53c710 support, possibly not really needed any more.
+ */
+
+u32 insn_log[4096];
+u32 insn_log_index = 0;
+
+void log1 (u32 i)
+{
+ insn_log[insn_log_index++] = i;
+ if (insn_log_index == 4096)
+ insn_log_index = 0;
+}
+
+void log_insn (u32 *ip)
+{
+ log1 ((u32)ip);
+ log1 (*ip);
+ log1 (*(ip+1));
+ if (((*ip >> 24) & DCMD_TYPE_MASK) == DCMD_TYPE_MMI)
+ log1 (*(ip+2));
+}
+
+void dump_log(void)
+{
+ int cnt = 0;
+ int i = insn_log_index;
+ int size;
+ struct Scsi_Host *host = first_host;
+
+ while (cnt < 4096) {
+ printk ("%08x (+%6x): ", insn_log[i], (insn_log[i] - (u32)&(((struct NCR53c7x0_hostdata *)host->hostdata)->script))/4);
+ if (++i == 4096)
+ i = 0;
+ cnt++;
+ if (((insn_log[i] >> 24) & DCMD_TYPE_MASK) == DCMD_TYPE_MMI)
+ size = 3;
+ else
+ size = 2;
+ while (size--) {
+ printk ("%08x ", insn_log[i]);
+ if (++i == 4096)
+ i = 0;
+ cnt++;
+ }
+ printk ("\n");
+ }
+}
+#endif
+
+/*
+ * Function : static void NCR53c7x0_intr (int irq, void *dev_id, struct pt_regs * regs)
+ *
+ * Purpose : handle NCR53c7x0 interrupts for all NCR devices sharing
+ * the same IRQ line.
+ *
+ * Inputs : Since we're using the SA_INTERRUPT interrupt handler
+ * semantics, irq indicates the interrupt which invoked
+ * this handler.
+ *
+ * On the 710 we simualte an INTFLY with a script interrupt, and the
+ * script interrupt handler will call back to this function.
+ */
+
+void
+NCR53c7x0_intr (int irq, void *dev_id, struct pt_regs * regs) {
+ NCR53c7x0_local_declare();
+ struct Scsi_Host *host; /* Host we are looking at */
+ unsigned char istat; /* Values of interrupt regs */
+ struct NCR53c7x0_hostdata *hostdata; /* host->hostdata */
+ struct NCR53c7x0_cmd *cmd, /* command which halted */
+ **cmd_prev_ptr;
+ u32 *dsa; /* DSA */
+ int done = 1; /* Indicates when handler
+ should terminate */
+ int interrupted = 0; /* This HA generated
+ an interrupt */
+ int have_intfly; /* Don't print warning
+ messages when we stack
+ INTFLYs */
+ unsigned long flags;
+
+#ifdef NCR_DEBUG
+ char buf[80]; /* Debugging sprintf buffer */
+ size_t buflen; /* Length of same */
+#endif
+
+#if defined(CONFIG_AMIGA)
+ custom.intena = IF_PORTS;
+#endif
+
+ do {
+ done = 1;
+ for (host = first_host; host; host = host->next)
+ if (host->hostt == the_template
+#if defined(MVME166_INTFLY)
+ /* We have two different interrupts pointing
+ * at this routine, so remove this check */
+#else
+ && host->irq == irq
+#endif
+ ) {
+ NCR53c7x0_local_setup(host);
+
+ hostdata = (struct NCR53c7x0_hostdata *) host->hostdata;
+ hostdata->dsp_changed = 0;
+ interrupted = 0;
+ have_intfly = 0;
+
+ do {
+ hostdata->dstat_valid = 0;
+ interrupted = 0;
+ /*
+ * Only read istat once, since reading it again will unstack
+ * interrupts?
+ */
+ istat = NCR53c7x0_read8(hostdata->istat);
+
+ if ((hostdata->options & OPTION_INTFLY) &&
+#ifdef MVME166_INTFLY
+ /* the bit is set which indicates an on-the-fly int */
+ (*(volatile unsigned long *)0xfff40068 & 0x8000))
+#else
+ (hostdata->emulated_intfly != 0))
+#endif
+ {
+ char search_found = 0; /* Got at least one ? */
+ done = 0;
+ interrupted = 1;
+
+#ifdef MVME166_INTFLY
+ /* clear the INTFLY bit */
+ *(volatile unsigned long *)0xfff40074 = 0x8000;
+#endif
+
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk ("scsi%d : INTFLY\n", host->host_no);
+
+ /*
+ * Traverse our list of running commands, and look
+ * for those with valid (non-0xff ff) status and message
+ * bytes encoded in the result which signify command
+ * completion.
+ */
+
+
+ save_flags(flags);
+ cli();
+restart:
+ for (cmd_prev_ptr = (struct NCR53c7x0_cmd **)
+ &(hostdata->running_list), cmd =
+ (struct NCR53c7x0_cmd *) hostdata->running_list; cmd ;
+ cmd_prev_ptr = (struct NCR53c7x0_cmd **) &(cmd->next),
+ cmd = (struct NCR53c7x0_cmd *) cmd->next) {
+ Scsi_Cmnd *tmp;
+
+ if (!cmd) {
+ printk("scsi%d : very weird.\n", host->host_no);
+ break;
+ }
+
+ if (!(tmp = cmd->cmd)) {
+ printk("scsi%d : weird. NCR53c7x0_cmd has no Scsi_Cmnd\n",
+ host->host_no);
+ continue;
+ }
+#if 0
+ printk ("scsi%d : looking at result of 0x%x\n",
+ host->host_no, cmd->cmd->result);
+#endif
+
+ if (((tmp->result & 0xff) == 0xff) ||
+ ((tmp->result & 0xff00) == 0xff00))
+ continue;
+
+ search_found = 1;
+
+ /* Important - remove from list _before_ done is called */
+ if (cmd_prev_ptr)
+ *cmd_prev_ptr = (struct NCR53c7x0_cmd *) cmd->next;
+
+ --hostdata->busy[tmp->target][tmp->lun];
+ cmd->next = hostdata->free;
+ hostdata->free = cmd;
+
+ tmp->host_scribble = NULL;
+
+ if (hostdata->options & OPTION_DEBUG_INTR) {
+ printk ("scsi%d : command complete : pid %lu, id %d,lun %d result 0x%x ",
+ host->host_no, tmp->pid, tmp->target, tmp->lun, tmp->result);
+ print_command (tmp->cmnd);
+ }
+
+#if 0
+ hostdata->options &= ~OPTION_DEBUG_INTR;
+#endif
+ tmp->scsi_done(tmp);
+ goto restart;
+
+ }
+ restore_flags(flags);
+
+ if (!search_found && !have_intfly) {
+ printk ("scsi%d : WARNING : INTFLY with no completed commands.\n",
+ host->host_no);
+ } else if (!have_intfly) {
+ have_intfly = 1;
+ run_process_issue_queue();
+ }
+ }
+
+ if (hostdata->emulated_intfly)
+ {
+ hostdata->emulated_intfly = 0;
+ return;
+ }
+
+ if (istat & (ISTAT_SIP|ISTAT_DIP)) {
+ done = 0;
+ interrupted = 1;
+ hostdata->state = STATE_HALTED;
+
+ if (NCR53c7x0_read8 (SSTAT2_REG) & SSTAT2_FF_MASK)
+ printk ("scsi%d : SCSI FIFO not empty\n",
+ host->host_no);
+
+ /*
+ * NCR53c700 and NCR53c700-66 change the current SCSI
+ * process, hostdata->ncrcurrent, in the Linux driver so
+ * cmd = hostdata->ncrcurrent.
+ *
+ * With other chips, we must look through the commands
+ * executing and find the command structure which
+ * corresponds to the DSA register.
+ */
+
+ if (hostdata->options & OPTION_700) {
+ cmd = (struct NCR53c7x0_cmd *) hostdata->ncrcurrent;
+ } else {
+ dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
+ for (cmd = (struct NCR53c7x0_cmd *)
+ hostdata->running_list; cmd &&
+ (dsa + (hostdata->dsa_start / sizeof(u32))) !=
+ cmd->dsa;
+ cmd = (struct NCR53c7x0_cmd *)(cmd->next));
+ }
+ if (hostdata->options & OPTION_DEBUG_INTR) {
+ if (cmd) {
+ printk("scsi%d : interrupt for pid %lu, id %d, lun %d ",
+ host->host_no, cmd->cmd->pid, (int) cmd->cmd->target,
+ (int) cmd->cmd->lun);
+ print_command (cmd->cmd->cmnd);
+ } else {
+ printk("scsi%d : no active command\n", host->host_no);
+ }
+ }
+
+ if (istat & ISTAT_SIP) {
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk ("scsi%d : ISTAT_SIP\n", host->host_no);
+ intr_scsi (host, cmd);
+ }
+
+ if (istat & ISTAT_DIP) {
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk ("scsi%d : ISTAT_DIP\n", host->host_no);
+ intr_dma (host, cmd);
+ }
+
+ if (!hostdata->dstat_valid) {
+ hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
+ hostdata->dstat_valid = 1;
+ }
+
+ if (!(hostdata->dstat & DSTAT_DFE)) {
+ printk ("scsi%d : DMA FIFO not empty\n", host->host_no);
+ /* Really need to check this out for 710 RGH */
+ NCR53c7x0_write8 (CTEST8_REG, CTEST8_10_CLF);
+ while (NCR53c7x0_read8 (CTEST8_REG) & CTEST8_10_CLF);
+ hostdata->dstat |= DSTAT_DFE;
+ }
+ }
+ } while (interrupted);
+
+
+
+ if (hostdata->intrs != -1)
+ hostdata->intrs++;
+#if 0
+ if (hostdata->intrs > 40) {
+ printk("scsi%d : too many interrupts, halting", host->host_no);
+ disable(host);
+ }
+#endif
+
+ if (!hostdata->idle && hostdata->state == STATE_HALTED) {
+ if (!hostdata->dsp_changed) {
+ hostdata->dsp = (u32 *)
+ bus_to_virt(NCR53c7x0_read32(DSP_REG));
+ }
+
+#if 0
+ printk("scsi%d : new dsp is 0x%lx (virt 0x%p)\n",
+ host->host_no, virt_to_bus(hostdata->dsp), hostdata->dsp);
+#endif
+
+ hostdata->state = STATE_RUNNING;
+ NCR53c7x0_write32 (DSP_REG, virt_to_bus(hostdata->dsp));
+ if (hostdata->options & OPTION_DEBUG_TRACE) {
+#ifdef CYCLIC_TRACE
+ log_insn (hostdata->dsp);
+#else
+ print_insn (host, hostdata->dsp, "t ", 1);
+#endif
+ NCR53c7x0_write8 (DCNTL_REG, hostdata->saved_dcntl |
+ DCNTL_SSM | DCNTL_STD);
+ }
+ }
+ }
+ } while (!done);
+#ifdef CONFIG_AMIGA
+ custom.intena = IF_SETCLR | IF_PORTS;
+#endif
+}
+
+
+/*
+ * Function : static int abort_connected (struct Scsi_Host *host)
+ *
+ * Purpose : Assuming that the NCR SCSI processor is currently
+ * halted, break the currently established nexus. Clean
+ * up of the NCR53c7x0_cmd and Scsi_Cmnd structures should
+ * be done on receipt of the abort interrupt.
+ *
+ * Inputs : host - SCSI host
+ *
+ */
+
+static int
+abort_connected (struct Scsi_Host *host) {
+#ifdef NEW_ABORT
+ NCR53c7x0_local_declare();
+#endif
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+/* FIXME : this probably should change for production kernels; at the
+ least, counter should move to a per-host structure. */
+ static int counter = 5;
+#ifdef NEW_ABORT
+ int sstat, phase, offset;
+ u32 *script;
+ NCR53c7x0_local_setup(host);
+#endif
+
+ if (--counter <= 0) {
+ disable(host);
+ return 0;
+ }
+
+ printk ("scsi%d : DANGER : abort_connected() called \n",
+ host->host_no);
+
+#ifdef NEW_ABORT
+
+/*
+ * New strategy : Rather than using a generic abort routine,
+ * we'll specifically try to source or sink the appropriate
+ * amount of data for the phase we're currently in (taking into
+ * account the current synchronous offset)
+ */
+
+ sstat = (NCR53c8x0_read8 (SSTAT2_REG);
+ offset = OFFSET (sstat & SSTAT2_FF_MASK) >> SSTAT2_FF_SHIFT;
+ phase = sstat & SSTAT2_PHASE_MASK;
+
+/*
+ * SET ATN
+ * MOVE source_or_sink, WHEN CURRENT PHASE
+ * < repeat for each outstanding byte >
+ * JUMP send_abort_message
+ */
+
+ script = hostdata->abort_script = kmalloc (
+ 8 /* instruction size */ * (
+ 1 /* set ATN */ +
+ (!offset ? 1 : offset) /* One transfer per outstanding byte */ +
+ 1 /* send abort message */),
+ GFP_ATOMIC);
+
+
+#else /* def NEW_ABORT */
+ hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
+ sizeof(u32);
+#endif /* def NEW_ABORT */
+ hostdata->dsp_changed = 1;
+
+/* XXX - need to flag the command as aborted after the abort_connected
+ code runs
+ */
+ return 0;
+}
+
+/*
+ * Function : static int datapath_residual (Scsi_Host *host)
+ *
+ * Purpose : return residual data count of what's in the chip.
+ *
+ * Inputs : host - SCSI host
+ */
+
+static int
+datapath_residual (struct Scsi_Host *host) {
+ NCR53c7x0_local_declare();
+ int count, synchronous, sstat;
+ unsigned int ddir;
+
+ NCR53c7x0_local_setup(host);
+ /* COMPAT : the 700 and 700-66 need to use DFIFO_00_BO_MASK */
+ count = ((NCR53c7x0_read8 (DFIFO_REG) & DFIFO_10_BO_MASK) -
+ (NCR53c7x0_read32 (DBC_REG) & DFIFO_10_BO_MASK)) & DFIFO_10_BO_MASK;
+ synchronous = NCR53c7x0_read8 (SXFER_REG) & SXFER_MO_MASK;
+ /* COMPAT : DDIR is elsewhere on non-'8xx chips. */
+ ddir = NCR53c7x0_read8 (CTEST0_REG_700) & CTEST0_700_DDIR;
+
+ if (ddir) {
+ /* Receive */
+ if (synchronous)
+ count += (NCR53c7x0_read8 (SSTAT2_REG) & SSTAT2_FF_MASK) >> SSTAT2_FF_SHIFT;
+ else
+ if (NCR53c7x0_read8 (SSTAT1_REG) & SSTAT1_ILF)
+ ++count;
+ } else {
+ /* Send */
+ sstat = NCR53c7x0_read8 (SSTAT1_REG);
+ if (sstat & SSTAT1_OLF)
+ ++count;
+ if (synchronous && (sstat & SSTAT1_ORF))
+ ++count;
+ }
+ return count;
+}
+
+/*
+ * Function : static const char * sbcl_to_phase (int sbcl)_
+ *
+ * Purpose : Convert SBCL register to user-parsable phase representation
+ *
+ * Inputs : sbcl - value of sbcl register
+ */
+
+
+static const char *
+sbcl_to_phase (int sbcl) {
+ switch (sbcl & SBCL_PHASE_MASK) {
+ case SBCL_PHASE_DATAIN:
+ return "DATAIN";
+ case SBCL_PHASE_DATAOUT:
+ return "DATAOUT";
+ case SBCL_PHASE_MSGIN:
+ return "MSGIN";
+ case SBCL_PHASE_MSGOUT:
+ return "MSGOUT";
+ case SBCL_PHASE_CMDOUT:
+ return "CMDOUT";
+ case SBCL_PHASE_STATIN:
+ return "STATUSIN";
+ default:
+ return "unknown";
+ }
+}
+
+/*
+ * Function : static const char * sstat2_to_phase (int sstat)_
+ *
+ * Purpose : Convert SSTAT2 register to user-parsable phase representation
+ *
+ * Inputs : sstat - value of sstat register
+ */
+
+
+static const char *
+sstat2_to_phase (int sstat) {
+ switch (sstat & SSTAT2_PHASE_MASK) {
+ case SSTAT2_PHASE_DATAIN:
+ return "DATAIN";
+ case SSTAT2_PHASE_DATAOUT:
+ return "DATAOUT";
+ case SSTAT2_PHASE_MSGIN:
+ return "MSGIN";
+ case SSTAT2_PHASE_MSGOUT:
+ return "MSGOUT";
+ case SSTAT2_PHASE_CMDOUT:
+ return "CMDOUT";
+ case SSTAT2_PHASE_STATIN:
+ return "STATUSIN";
+ default:
+ return "unknown";
+ }
+}
+
+/*
+ * Function : static void intr_phase_mismatch (struct Scsi_Host *host,
+ * struct NCR53c7x0_cmd *cmd)
+ *
+ * Purpose : Handle phase mismatch interrupts
+ *
+ * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
+ * may be NULL.
+ *
+ * Side effects : The abort_connected() routine is called or the NCR chip
+ * is restarted, jumping to the command_complete entry point, or
+ * patching the address and transfer count of the current instruction
+ * and calling the msg_in entry point as appropriate.
+ */
+
+static void
+intr_phase_mismatch (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
+ NCR53c7x0_local_declare();
+ u32 dbc_dcmd, *dsp, *dsp_next;
+ unsigned char dcmd, sbcl;
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ int residual;
+ enum {ACTION_ABORT, ACTION_ABORT_PRINT, ACTION_CONTINUE} action =
+ ACTION_ABORT_PRINT;
+ const char *where = NULL;
+
+ NCR53c7x0_local_setup(host);
+
+ /*
+ * Corrective action is based on where in the SCSI SCRIPT(tm) the error
+ * occurred, as well as which SCSI phase we are currently in.
+ */
+ dsp_next = bus_to_virt(NCR53c7x0_read32(DSP_REG));
+
+ /*
+ * Fetch the current instruction, and remove the operands for easier
+ * interpretation.
+ */
+ dbc_dcmd = NCR53c7x0_read32(DBC_REG);
+ dcmd = (dbc_dcmd & 0xff000000) >> 24;
+ /*
+ * Like other processors, the NCR adjusts the instruction pointer before
+ * instruction decode. Set the DSP address back to what it should
+ * be for this instruction based on its size (2 or 3 32 bit words).
+ */
+ dsp = dsp_next - NCR53c7x0_insn_size(dcmd);
+
+
+ /*
+ * Read new SCSI phase from the SBCL lines. Since all of our code uses
+ * a WHEN conditional instead of an IF conditional, we don't need to
+ * wait for a new REQ.
+ */
+ sbcl = NCR53c7x0_read8(SBCL_REG) & SBCL_PHASE_MASK;
+
+ if (!cmd) {
+ action = ACTION_ABORT_PRINT;
+ where = "no current command";
+ /*
+ * The way my SCSI SCRIPTS(tm) are architected, recoverable phase
+ * mismatches should only occur where we're doing a multi-byte
+ * BMI instruction. Specifically, this means
+ *
+ * - select messages (a SCSI-I target may ignore additional messages
+ * after the IDENTIFY; any target may reject a SDTR or WDTR)
+ *
+ * - command out (targets may send a message to signal an error
+ * condition, or go into STATUSIN after they've decided
+ * they don't like the command.
+ *
+ * - reply_message (targets may reject a multi-byte message in the
+ * middle)
+ *
+ * - data transfer routines (command completion with buffer space
+ * left, disconnect message, or error message)
+ */
+ } else if (((dsp >= cmd->data_transfer_start &&
+ dsp < cmd->data_transfer_end)) || dsp == (cmd->residual + 2)) {
+ if ((dcmd & (DCMD_TYPE_MASK|DCMD_BMI_OP_MASK|DCMD_BMI_INDIRECT|
+ DCMD_BMI_MSG|DCMD_BMI_CD)) == (DCMD_TYPE_BMI|
+ DCMD_BMI_OP_MOVE_I)) {
+ residual = datapath_residual (host);
+ if (hostdata->options & OPTION_DEBUG_DISCONNECT)
+ printk ("scsi%d : handling residual transfer (+ %d bytes from DMA FIFO)\n",
+ host->host_no, residual);
+
+ /*
+ * The first instruction is a CALL to the alternate handler for
+ * this data transfer phase, so we can do calls to
+ * munge_msg_restart as we would if control were passed
+ * from normal dynamic code.
+ */
+ if (dsp != cmd->residual + 2) {
+ cmd->residual[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL |
+ ((dcmd & DCMD_BMI_IO) ? DCMD_TCI_IO : 0)) << 24) |
+ DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE;
+ cmd->residual[1] = virt_to_bus(hostdata->script)
+ + ((dcmd & DCMD_BMI_IO)
+ ? hostdata->E_other_in : hostdata->E_other_out);
+ }
+
+ /*
+ * The second instruction is the a data transfer block
+ * move instruction, reflecting the pointer and count at the
+ * time of the phase mismatch.
+ */
+ cmd->residual[2] = dbc_dcmd + residual;
+ cmd->residual[3] = NCR53c7x0_read32(DNAD_REG) - residual;
+
+ /*
+ * The third and final instruction is a jump to the instruction
+ * which follows the instruction which had to be 'split'
+ */
+ if (dsp != cmd->residual + 2) {
+ cmd->residual[4] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP)
+ << 24) | DBC_TCI_TRUE;
+ cmd->residual[5] = virt_to_bus(dsp_next);
+ }
+
+ /*
+ * For the sake of simplicity, transfer control to the
+ * conditional CALL at the start of the residual buffer.
+ */
+ hostdata->dsp = cmd->residual;
+ hostdata->dsp_changed = 1;
+ action = ACTION_CONTINUE;
+ } else {
+ where = "non-BMI dynamic DSA code";
+ action = ACTION_ABORT_PRINT;
+ }
+ } else if (dsp == (hostdata->script + hostdata->E_select_msgout / 4)) {
+ /* Release ATN */
+ NCR53c7x0_write8 (SOCL_REG, 0);
+ switch (sbcl) {
+ /*
+ * Some devices (SQ555 come to mind) grab the IDENTIFY message
+ * sent on selection, and decide to go into COMMAND OUT phase
+ * rather than accepting the rest of the messages or rejecting
+ * them. Handle these devices gracefully.
+ */
+ case SBCL_PHASE_CMDOUT:
+ hostdata->dsp = dsp + 2 /* two _words_ */;
+ hostdata->dsp_changed = 1;
+ printk ("scsi%d : target %d ignored SDTR and went into COMMAND OUT\n",
+ host->host_no, cmd->cmd->target);
+ cmd->flags &= ~CMD_FLAG_SDTR;
+ action = ACTION_CONTINUE;
+ break;
+ case SBCL_PHASE_MSGIN:
+ hostdata->dsp = hostdata->script + hostdata->E_msg_in /
+ sizeof(u32);
+ hostdata->dsp_changed = 1;
+ action = ACTION_CONTINUE;
+ break;
+ default:
+ where="select message out";
+ action = ACTION_ABORT_PRINT;
+ }
+ /*
+ * Some SCSI devices will interpret a command as they read the bytes
+ * off the SCSI bus, and may decide that the command is Bogus before
+ * they've read the entire command off the bus.
+ */
+ } else if (dsp == hostdata->script + hostdata->E_cmdout_cmdout / sizeof
+ (u32)) {
+ hostdata->dsp = hostdata->script + hostdata->E_data_transfer /
+ sizeof (u32);
+ hostdata->dsp_changed = 1;
+ action = ACTION_CONTINUE;
+ /* FIXME : we need to handle message reject, etc. within msg_respond. */
+#ifdef notyet
+ } else if (dsp == hostdata->script + hostdata->E_reply_message) {
+ switch (sbcl) {
+ /* Any other phase mismatches abort the currently executing command. */
+#endif
+ } else {
+ where = "unknown location";
+ action = ACTION_ABORT_PRINT;
+ }
+
+ /* Flush DMA FIFO */
+ if (!hostdata->dstat_valid) {
+ hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
+ hostdata->dstat_valid = 1;
+ }
+ if (!(hostdata->dstat & DSTAT_DFE)) {
+ /* Really need to check this out for 710 RGH */
+ NCR53c7x0_write8 (CTEST8_REG, CTEST8_10_CLF);
+ while (NCR53c7x0_read8 (CTEST8_REG) & CTEST8_10_CLF);
+ hostdata->dstat |= DSTAT_DFE;
+ }
+
+ switch (action) {
+ case ACTION_ABORT_PRINT:
+ printk("scsi%d : %s : unexpected phase %s.\n",
+ host->host_no, where ? where : "unknown location",
+ sbcl_to_phase(sbcl));
+ print_lots (host);
+ /* Fall through to ACTION_ABORT */
+ case ACTION_ABORT:
+ abort_connected (host);
+ break;
+ case ACTION_CONTINUE:
+ break;
+ }
+
+#if 0
+ if (hostdata->dsp_changed) {
+ printk("scsi%d: new dsp 0x%p\n", host->host_no, hostdata->dsp);
+ print_insn (host, hostdata->dsp, "", 1);
+ }
+#endif
+
+ cache_push(virt_to_bus(hostdata->script), flushsize);
+}
+
+/*
+ * Function : static void intr_bf (struct Scsi_Host *host,
+ * struct NCR53c7x0_cmd *cmd)
+ *
+ * Purpose : handle BUS FAULT interrupts
+ *
+ * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
+ * may be NULL.
+ */
+
+static void
+intr_bf (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
+ NCR53c7x0_local_declare();
+ u32 *dsp,
+ *next_dsp, /* Current dsp */
+ *dsa,
+ dbc_dcmd; /* DCMD (high eight bits) + DBC */
+ char *reason = NULL;
+ /* Default behavior is for a silent error, with a retry until we've
+ exhausted retries. */
+ enum {MAYBE, ALWAYS, NEVER} retry = MAYBE;
+ int report = 0;
+ NCR53c7x0_local_setup(host);
+
+ dbc_dcmd = NCR53c7x0_read32 (DBC_REG);
+ next_dsp = bus_to_virt (NCR53c7x0_read32(DSP_REG));
+ dsp = next_dsp - NCR53c7x0_insn_size ((dbc_dcmd >> 24) & 0xff);
+/* FIXME - check chip type */
+ dsa = bus_to_virt (NCR53c7x0_read32(DSA_REG));
+
+ /*
+ * Bus faults can be caused by either a Bad Address or
+ * Target Abort. We should check the Received Target Abort
+ * bit of the PCI status register and Master Abort Bit.
+ *
+ * - Master Abort bit indicates that no device claimed
+ * the address with DEVSEL within five clocks
+ *
+ * - Target Abort bit indicates that a target claimed it,
+ * but changed its mind once it saw the byte enables.
+ *
+ */
+
+ /* 53c710, not PCI system */
+ report = 1;
+ reason = "Unknown";
+
+#ifndef notyet
+ report = 1;
+#endif
+ if (report && reason)
+ {
+ printk(KERN_ALERT "scsi%d : BUS FAULT reason = %s\n",
+ host->host_no, reason ? reason : "unknown");
+ print_lots (host);
+ }
+
+#ifndef notyet
+ retry = NEVER;
+#endif
+
+ /*
+ * TODO : we should attempt to recover from any spurious bus
+ * faults. After X retries, we should figure that things are
+ * sufficiently wedged, and call NCR53c7xx_reset.
+ *
+ * This code should only get executed once we've decided that we
+ * cannot retry.
+ */
+
+ if (retry == NEVER) {
+ printk(KERN_ALERT " mail drew@PoohSticks.ORG\n");
+ FATAL (host);
+ }
+}
+
+/*
+ * Function : static void intr_dma (struct Scsi_Host *host,
+ * struct NCR53c7x0_cmd *cmd)
+ *
+ * Purpose : handle all DMA interrupts, indicated by the setting
+ * of the DIP bit in the ISTAT register.
+ *
+ * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
+ * may be NULL.
+ */
+
+static void
+intr_dma (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
+ NCR53c7x0_local_declare();
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ unsigned char dstat; /* DSTAT */
+ u32 *dsp,
+ *next_dsp, /* Current dsp */
+ *dsa,
+ dbc_dcmd; /* DCMD (high eight bits) + DBC */
+ int tmp;
+ unsigned long flags;
+ NCR53c7x0_local_setup(host);
+
+ if (!hostdata->dstat_valid) {
+ hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
+ hostdata->dstat_valid = 1;
+ }
+
+ dstat = hostdata->dstat;
+
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk("scsi%d : DSTAT=0x%x\n", host->host_no, (int) dstat);
+
+ dbc_dcmd = NCR53c7x0_read32 (DBC_REG);
+ next_dsp = bus_to_virt(NCR53c7x0_read32(DSP_REG));
+ dsp = next_dsp - NCR53c7x0_insn_size ((dbc_dcmd >> 24) & 0xff);
+/* XXX - check chip type */
+ dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
+
+ /*
+ * DSTAT_ABRT is the aborted interrupt. This is set whenever the
+ * SCSI chip is aborted.
+ *
+ * With NCR53c700 and NCR53c700-66 style chips, we should only
+ * get this when the chip is currently running the accept
+ * reselect/select code and we have set the abort bit in the
+ * ISTAT register.
+ *
+ */
+
+ if (dstat & DSTAT_ABRT) {
+#if 0
+ /* XXX - add code here to deal with normal abort */
+ if ((hostdata->options & OPTION_700) && (hostdata->state ==
+ STATE_ABORTING)) {
+ } else
+#endif
+ {
+ printk(KERN_ALERT "scsi%d : unexpected abort interrupt at\n"
+ " ", host->host_no);
+ print_insn (host, dsp, KERN_ALERT "s ", 1);
+ FATAL (host);
+ }
+ }
+
+ /*
+ * DSTAT_SSI is the single step interrupt. Should be generated
+ * whenever we have single stepped or are tracing.
+ */
+
+ if (dstat & DSTAT_SSI) {
+ if (hostdata->options & OPTION_DEBUG_TRACE) {
+ /* Don't print instr. until we write DSP at end of intr function */
+ } else if (hostdata->options & OPTION_DEBUG_SINGLE) {
+ print_insn (host, dsp, "s ", 0);
+ save_flags(flags);
+ cli();
+/* XXX - should we do this, or can we get away with writing dsp? */
+
+ NCR53c7x0_write8 (DCNTL_REG, (NCR53c7x0_read8(DCNTL_REG) &
+ ~DCNTL_SSM) | DCNTL_STD);
+ restore_flags(flags);
+ } else {
+ printk(KERN_ALERT "scsi%d : unexpected single step interrupt at\n"
+ " ", host->host_no);
+ print_insn (host, dsp, KERN_ALERT "", 1);
+ printk(KERN_ALERT " mail drew@PoohSticks.ORG\n");
+ FATAL (host);
+ }
+ }
+
+ /*
+ * DSTAT_IID / DSTAT_OPC (same bit, same meaning, only the name
+ * is different) is generated whenever an illegal instruction is
+ * encountered.
+ *
+ * XXX - we may want to emulate INTFLY here, so we can use
+ * the same SCSI SCRIPT (tm) for NCR53c710 through NCR53c810
+ * chips.
+ */
+
+ if (dstat & DSTAT_OPC) {
+ /*
+ * Ascertain if this IID interrupts occurred before or after a STO
+ * interrupt. Since the interrupt handling code now leaves
+ * DSP unmodified until _after_ all stacked interrupts have been
+ * processed, reading the DSP returns the original DSP register.
+ * This means that if dsp lies between the select code, and
+ * message out following the selection code (where the IID interrupt
+ * would have to have occurred by due to the implicit wait for REQ),
+ * we have an IID interrupt resulting from a STO condition and
+ * can ignore it.
+ */
+
+ if (((dsp >= (hostdata->script + hostdata->E_select / sizeof(u32))) &&
+ (dsp <= (hostdata->script + hostdata->E_select_msgout /
+ sizeof(u32) + 8))) || (hostdata->test_running == 2)) {
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk ("scsi%d : ignoring DSTAT_IID for SSTAT_STO\n",
+ host->host_no);
+ if (hostdata->expecting_iid) {
+ hostdata->expecting_iid = 0;
+ hostdata->idle = 1;
+ if (hostdata->test_running == 2) {
+ hostdata->test_running = 0;
+ hostdata->test_completed = 3;
+ } else if (cmd)
+ abnormal_finished (cmd, DID_BAD_TARGET << 16);
+ } else {
+ hostdata->expecting_sto = 1;
+ }
+ /*
+ * We can't guarantee we'll be able to execute the WAIT DISCONNECT
+ * instruction within the 3.4us of bus free and arbitration delay
+ * that a target can RESELECT in and assert REQ after we've dropped
+ * ACK. If this happens, we'll get an illegal instruction interrupt.
+ * Doing away with the WAIT DISCONNECT instructions broke everything,
+ * so instead I'll settle for moving one WAIT DISCONNECT a few
+ * instructions closer to the CLEAR ACK before it to minimize the
+ * chances of this happening, and handle it if it occurs anyway.
+ *
+ * Simply continue with what we were doing, and control should
+ * be transfered to the schedule routine which will ultimately
+ * pass control onto the reselection or selection (not yet)
+ * code.
+ */
+ } else if (dbc_dcmd == 0x48000000 && (NCR53c7x0_read8 (SBCL_REG) &
+ SBCL_REQ)) {
+ if (!(hostdata->options & OPTION_NO_PRINT_RACE))
+ {
+ printk("scsi%d: REQ before WAIT DISCONNECT IID\n",
+ host->host_no);
+ hostdata->options |= OPTION_NO_PRINT_RACE;
+ }
+ } else {
+ printk(KERN_ALERT "scsi%d : illegal instruction\n", host->host_no);
+ print_lots (host);
+ printk(KERN_ALERT " mail Richard@sleepie.demon.co.uk with ALL\n"
+ " boot messages and diagnostic output\n");
+ FATAL (host);
+ }
+ }
+
+ /*
+ * DSTAT_BF are bus fault errors. DSTAT_800_BF is valid for 710 also.
+ */
+
+ if (dstat & DSTAT_800_BF) {
+ intr_bf (host, cmd);
+ }
+
+
+ /*
+ * DSTAT_SIR interrupts are generated by the execution of
+ * the INT instruction. Since the exact values available
+ * are determined entirely by the SCSI script running,
+ * and are local to a particular script, a unique handler
+ * is called for each script.
+ */
+
+ if (dstat & DSTAT_SIR) {
+ if (hostdata->options & OPTION_DEBUG_INTR)
+ printk ("scsi%d : DSTAT_SIR\n", host->host_no);
+ switch ((tmp = hostdata->dstat_sir_intr (host, cmd))) {
+ case SPECIFIC_INT_NOTHING:
+ case SPECIFIC_INT_RESTART:
+ break;
+ case SPECIFIC_INT_ABORT:
+ abort_connected(host);
+ break;
+ case SPECIFIC_INT_PANIC:
+ printk(KERN_ALERT "scsi%d : failure at ", host->host_no);
+ print_insn (host, dsp, KERN_ALERT "", 1);
+ printk(KERN_ALERT " dstat_sir_intr() returned SPECIFIC_INT_PANIC\n");
+ FATAL (host);
+ break;
+ case SPECIFIC_INT_BREAK:
+ intr_break (host, cmd);
+ break;
+ default:
+ printk(KERN_ALERT "scsi%d : failure at ", host->host_no);
+ print_insn (host, dsp, KERN_ALERT "", 1);
+ printk(KERN_ALERT" dstat_sir_intr() returned unknown value %d\n",
+ tmp);
+ FATAL (host);
+ }
+ }
+}
+
+/*
+ * Function : static int print_insn (struct Scsi_Host *host,
+ * u32 *insn, int kernel)
+ *
+ * Purpose : print numeric representation of the instruction pointed
+ * to by insn to the debugging or kernel message buffer
+ * as appropriate.
+ *
+ * If desired, a user level program can interpret this
+ * information.
+ *
+ * Inputs : host, insn - host, pointer to instruction, prefix -
+ * string to prepend, kernel - use printk instead of debugging buffer.
+ *
+ * Returns : size, in u32s, of instruction printed.
+ */
+
+/*
+ * FIXME: should change kernel parameter so that it takes an ENUM
+ * specifying severity - either KERN_ALERT or KERN_PANIC so
+ * all panic messages are output with the same severity.
+ */
+
+static int
+print_insn (struct Scsi_Host *host, const u32 *insn,
+ const char *prefix, int kernel) {
+ char buf[160], /* Temporary buffer and pointer. ICKY
+ arbitrary length. */
+
+
+ *tmp;
+ unsigned char dcmd; /* dcmd register for *insn */
+ int size;
+
+ /*
+ * Check to see if the instruction pointer is not bogus before
+ * indirecting through it; avoiding red-zone at start of
+ * memory.
+ *
+ * FIXME: icky magic needs to happen here on non-intel boxes which
+ * don't have kernel memory mapped in like this. Might be reasonable
+ * to use vverify()?
+ */
+
+ if (MAP_NR(insn) < 1 || MAP_NR(insn + 8) > MAP_NR(high_memory) ||
+ ((((dcmd = (insn[0] >> 24) & 0xff) & DCMD_TYPE_MMI) == DCMD_TYPE_MMI) &&
+ MAP_NR(insn + 12) > MAP_NR(high_memory))) {
+ size = 0;
+ sprintf (buf, "%s%p: address out of range\n",
+ prefix, insn);
+ } else {
+/*
+ * FIXME : (void *) cast in virt_to_bus should be unnecessary, because
+ * it should take const void * as argument.
+ */
+#ifndef CONFIG_MVME166
+ sprintf(buf, "%s0x%lx (virt 0x%p) : 0x%08x 0x%08x (virt 0x%p)",
+ (prefix ? prefix : ""), virt_to_bus((void *) insn), insn,
+ insn[0], insn[1], bus_to_virt (insn[1]));
+#else
+ /* Remove virtual addresses to reduce output, as they are the same */
+ sprintf(buf, "%s0x%x (+%x) : 0x%08x 0x%08x",
+ (prefix ? prefix : ""), (u32)insn, ((u32)insn -
+ (u32)&(((struct NCR53c7x0_hostdata *)host->hostdata)->script))/4,
+ insn[0], insn[1]);
+#endif
+ tmp = buf + strlen(buf);
+ if ((dcmd & DCMD_TYPE_MASK) == DCMD_TYPE_MMI) {
+#ifndef CONFIG_MVME166
+ sprintf (tmp, " 0x%08x (virt 0x%p)\n", insn[2],
+ bus_to_virt(insn[2]));
+#else
+ /* Remove virtual addr to reduce output, as it is the same */
+ sprintf (tmp, " 0x%08x\n", insn[2]);
+#endif
+ size = 3;
+ } else {
+ sprintf (tmp, "\n");
+ size = 2;
+ }
+ }
+
+ if (kernel)
+ printk ("%s", buf);
+#ifdef NCR_DEBUG
+ else {
+ size_t len = strlen(buf);
+ debugger_kernel_write(host, buf, len);
+ }
+#endif
+ return size;
+}
+
+/*
+ * Function : int NCR53c7xx_abort (Scsi_Cmnd *cmd)
+ *
+ * Purpose : Abort an errant SCSI command, doing all necessary
+ * cleanup of the issue_queue, running_list, shared Linux/NCR
+ * dsa issue and reconnect queues.
+ *
+ * Inputs : cmd - command to abort, code - entire result field
+ *
+ * Returns : 0 on success, -1 on failure.
+ */
+
+int
+NCR53c7xx_abort (Scsi_Cmnd *cmd) {
+ NCR53c7x0_local_declare();
+ struct Scsi_Host *host = cmd->host;
+ struct NCR53c7x0_hostdata *hostdata = host ? (struct NCR53c7x0_hostdata *)
+ host->hostdata : NULL;
+ unsigned long flags;
+ struct NCR53c7x0_cmd *curr, **prev;
+ Scsi_Cmnd *me, **last;
+#if 0
+ static long cache_pid = -1;
+#endif
+
+
+ if (!host) {
+ printk ("Bogus SCSI command pid %ld; no host structure\n",
+ cmd->pid);
+ return SCSI_ABORT_ERROR;
+ } else if (!hostdata) {
+ printk ("Bogus SCSI host %d; no hostdata\n", host->host_no);
+ return SCSI_ABORT_ERROR;
+ }
+ NCR53c7x0_local_setup(host);
+
+/*
+ * CHECK : I don't think that reading ISTAT will unstack any interrupts,
+ * since we need to write the INTF bit to clear it, and SCSI/DMA
+ * interrupts don't clear until we read SSTAT/SIST and DSTAT registers.
+ *
+ * See that this is the case. Appears to be correct on the 710, at least.
+ *
+ * I suspect that several of our failures may be coming from a new fatal
+ * interrupt (possibly due to a phase mismatch) happening after we've left
+ * the interrupt handler, but before the PIC has had the interrupt condition
+ * cleared.
+ */
+
+ if (NCR53c7x0_read8(hostdata->istat) & (ISTAT_DIP|ISTAT_SIP)) {
+ printk ("scsi%d : dropped interrupt for command %ld\n", host->host_no,
+ cmd->pid);
+ NCR53c7x0_intr (host->irq, NULL, NULL);
+ return SCSI_ABORT_BUSY;
+ }
+
+ save_flags(flags);
+ cli();
+#if 0
+ if (cache_pid == cmd->pid)
+ panic ("scsi%d : bloody fetus %d\n", host->host_no, cmd->pid);
+ else
+ cache_pid = cmd->pid;
+#endif
+
+
+/*
+ * The command could be hiding in the issue_queue. This would be very
+ * nice, as commands can't be moved from the high level driver's issue queue
+ * into the shared queue until an interrupt routine is serviced, and this
+ * moving is atomic.
+ *
+ * If this is the case, we don't have to worry about anything - we simply
+ * pull the command out of the old queue, and call it aborted.
+ */
+
+ for (me = (Scsi_Cmnd *) hostdata->issue_queue,
+ last = (Scsi_Cmnd **) &(hostdata->issue_queue);
+ me && me != cmd; last = (Scsi_Cmnd **)&(me->SCp.ptr),
+ me = (Scsi_Cmnd *)me->SCp.ptr);
+
+ if (me) {
+ *last = (Scsi_Cmnd *) me->SCp.ptr;
+ if (me->host_scribble) {
+ ((struct NCR53c7x0_cmd *)me->host_scribble)->next = hostdata->free;
+ hostdata->free = (struct NCR53c7x0_cmd *) me->host_scribble;
+ me->host_scribble = NULL;
+ }
+ cmd->result = DID_ABORT << 16;
+ cmd->scsi_done(cmd);
+ printk ("scsi%d : found command %ld in Linux issue queue\n",
+ host->host_no, me->pid);
+ restore_flags(flags);
+ run_process_issue_queue();
+ return SCSI_ABORT_SUCCESS;
+ }
+
+/*
+ * That failing, the command could be in our list of already executing
+ * commands. If this is the case, drastic measures are called for.
+ */
+
+ for (curr = (struct NCR53c7x0_cmd *) hostdata->running_list,
+ prev = (struct NCR53c7x0_cmd **) &(hostdata->running_list);
+ curr && curr->cmd != cmd; prev = (struct NCR53c7x0_cmd **)
+ &(curr->next), curr = (struct NCR53c7x0_cmd *) curr->next);
+
+ if (curr) {
+ if ((cmd->result & 0xff) != 0xff && (cmd->result & 0xff00) != 0xff00) {
+ if (prev)
+ *prev = (struct NCR53c7x0_cmd *) curr->next;
+ curr->next = (struct NCR53c7x0_cmd *) hostdata->free;
+ cmd->host_scribble = NULL;
+ hostdata->free = curr;
+ cmd->scsi_done(cmd);
+ printk ("scsi%d : found finished command %ld in running list\n",
+ host->host_no, cmd->pid);
+ restore_flags(flags);
+ return SCSI_ABORT_NOT_RUNNING;
+ } else {
+ printk ("scsi%d : DANGER : command running, can not abort.\n",
+ cmd->host->host_no);
+ restore_flags(flags);
+ return SCSI_ABORT_BUSY;
+ }
+ }
+
+/*
+ * And if we couldn't find it in any of our queues, it must have been
+ * a dropped interrupt.
+ */
+
+ curr = (struct NCR53c7x0_cmd *) cmd->host_scribble;
+ if (curr) {
+ curr->next = hostdata->free;
+ hostdata->free = curr;
+ cmd->host_scribble = NULL;
+ }
+
+ if (((cmd->result & 0xff00) == 0xff00) ||
+ ((cmd->result & 0xff) == 0xff)) {
+ printk ("scsi%d : did this command ever run?\n", host->host_no);
+ cmd->result = DID_ABORT << 16;
+ } else {
+ printk ("scsi%d : probably lost INTFLY, normal completion\n",
+ host->host_no);
+/*
+ * FIXME : We need to add an additional flag which indicates if a
+ * command was ever counted as BUSY, so if we end up here we can
+ * decrement the busy count if and only if it is necessary.
+ */
+ --hostdata->busy[cmd->target][cmd->lun];
+ }
+ restore_flags(flags);
+ cmd->scsi_done(cmd);
+
+/*
+ * We need to run process_issue_queue since termination of this command
+ * may allow another queued command to execute first?
+ */
+ return SCSI_ABORT_NOT_RUNNING;
+}
+
+/*
+ * Function : int NCR53c7xx_reset (Scsi_Cmnd *cmd)
+ *
+ * Purpose : perform a hard reset of the SCSI bus and NCR
+ * chip.
+ *
+ * Inputs : cmd - command which caused the SCSI RESET
+ *
+ * Returns : 0 on success.
+ */
+
+int
+NCR53c7xx_reset (Scsi_Cmnd *cmd, unsigned int reset_flags) {
+ NCR53c7x0_local_declare();
+ unsigned long flags;
+ int found = 0;
+ struct NCR53c7x0_cmd * c;
+ Scsi_Cmnd *tmp;
+ /*
+ * When we call scsi_done(), it's going to wake up anything sleeping on the
+ * resources which were in use by the aborted commands, and we'll start to
+ * get new commands.
+ *
+ * We can't let this happen until after we've re-initialized the driver
+ * structures, and can't reinitialize those structures until after we've
+ * dealt with their contents.
+ *
+ * So, we need to find all of the commands which were running, stick
+ * them on a linked list of completed commands (we'll use the host_scribble
+ * pointer), do our reinitialization, and then call the done function for
+ * each command.
+ */
+ Scsi_Cmnd *nuke_list = NULL;
+ struct Scsi_Host *host = cmd->host;
+ struct NCR53c7x0_hostdata *hostdata =
+ (struct NCR53c7x0_hostdata *) host->hostdata;
+
+ NCR53c7x0_local_setup(host);
+ save_flags(flags);
+ cli();
+ ncr_halt (host);
+ print_lots (host);
+ dump_events (host, 30);
+ ncr_scsi_reset (host);
+ for (tmp = nuke_list = return_outstanding_commands (host, 1 /* free */,
+ 0 /* issue */ ); tmp; tmp = (Scsi_Cmnd *) tmp->SCp.buffer)
+ if (tmp == cmd) {
+ found = 1;
+ break;
+ }
+
+ /*
+ * If we didn't find the command which caused this reset in our running
+ * list, then we've lost it. See that it terminates normally anyway.
+ */
+ if (!found) {
+ c = (struct NCR53c7x0_cmd *) cmd->host_scribble;
+ if (c) {
+ cmd->host_scribble = NULL;
+ c->next = hostdata->free;
+ hostdata->free = c;
+ } else
+ printk ("scsi%d: lost command %ld\n", host->host_no, cmd->pid);
+ cmd->SCp.buffer = (struct scatterlist *) nuke_list;
+ nuke_list = cmd;
+ }
+
+ NCR53c7x0_driver_init (host);
+ hostdata->soft_reset (host);
+ if (hostdata->resets == 0)
+ disable(host);
+ else if (hostdata->resets != -1)
+ --hostdata->resets;
+ sti();
+ for (; nuke_list; nuke_list = tmp) {
+ tmp = (Scsi_Cmnd *) nuke_list->SCp.buffer;
+ nuke_list->result = DID_RESET << 16;
+ nuke_list->scsi_done (nuke_list);
+ }
+ restore_flags(flags);
+ return SCSI_RESET_SUCCESS;
+}
+
+/*
+ * The NCR SDMS bios follows Annex A of the SCSI-CAM draft, and
+ * therefore shares the scsicam_bios_param function.
+ */
+
+/*
+ * Function : int insn_to_offset (Scsi_Cmnd *cmd, u32 *insn)
+ *
+ * Purpose : convert instructions stored at NCR pointer into data
+ * pointer offset.
+ *
+ * Inputs : cmd - SCSI command; insn - pointer to instruction. Either current
+ * DSP, or saved data pointer.
+ *
+ * Returns : offset on success, -1 on failure.
+ */
+
+
+static int
+insn_to_offset (Scsi_Cmnd *cmd, u32 *insn) {
+ struct NCR53c7x0_hostdata *hostdata =
+ (struct NCR53c7x0_hostdata *) cmd->host->hostdata;
+ struct NCR53c7x0_cmd *ncmd =
+ (struct NCR53c7x0_cmd *) cmd->host_scribble;
+ int offset = 0, buffers;
+ struct scatterlist *segment;
+ char *ptr;
+ int found = 0;
+
+/*
+ * With the current code implementation, if the insn is inside dynamically
+ * generated code, the data pointer will be the instruction preceding
+ * the next transfer segment.
+ */
+
+ if (!check_address ((unsigned long) ncmd, sizeof (struct NCR53c7x0_cmd)) &&
+ ((insn >= ncmd->data_transfer_start &&
+ insn < ncmd->data_transfer_end) ||
+ (insn >= ncmd->residual &&
+ insn < (ncmd->residual +
+ sizeof(ncmd->residual))))) {
+ ptr = bus_to_virt(insn[3]);
+
+ if ((buffers = cmd->use_sg)) {
+ for (offset = 0,
+ segment = (struct scatterlist *) cmd->buffer;
+ buffers && !((found = ((ptr >= segment->address) &&
+ (ptr < (segment->address + segment->length)))));
+ --buffers, offset += segment->length, ++segment)
+#if 0
+ printk("scsi%d: comparing 0x%p to 0x%p\n",
+ cmd->host->host_no, saved, segment->address);
+#else
+ ;
+#endif
+ offset += ptr - segment->address;
+ } else {
+ found = 1;
+ offset = ptr - (char *) (cmd->request_buffer);
+ }
+ } else if ((insn >= hostdata->script +
+ hostdata->E_data_transfer / sizeof(u32)) &&
+ (insn <= hostdata->script +
+ hostdata->E_end_data_transfer / sizeof(u32))) {
+ found = 1;
+ offset = 0;
+ }
+ return found ? offset : -1;
+}
+
+
+
+/*
+ * Function : void print_progress (Scsi_Cmnd *cmd)
+ *
+ * Purpose : print the current location of the saved data pointer
+ *
+ * Inputs : cmd - command we are interested in
+ *
+ */
+
+static void
+print_progress (Scsi_Cmnd *cmd) {
+ NCR53c7x0_local_declare();
+ struct NCR53c7x0_cmd *ncmd =
+ (struct NCR53c7x0_cmd *) cmd->host_scribble;
+ int offset, i;
+ char *where;
+ u32 *ptr;
+ NCR53c7x0_local_setup (cmd->host);
+ for (i = 0; i < 2; ++i) {
+ if (check_address ((unsigned long) ncmd,
+ sizeof (struct NCR53c7x0_cmd)) == -1)
+ continue;
+ if (!i) {
+ where = "saved";
+ ptr = bus_to_virt(ncmd->saved_data_pointer);
+ } else {
+ where = "active";
+ ptr = bus_to_virt (NCR53c7x0_read32 (DSP_REG) -
+ NCR53c7x0_insn_size (NCR53c7x0_read8 (DCMD_REG)) *
+ sizeof(u32));
+ }
+ offset = insn_to_offset (cmd, ptr);
+
+ if (offset != -1)
+ printk ("scsi%d : %s data pointer at offset %d\n",
+ cmd->host->host_no, where, offset);
+ else {
+ int size;
+ printk ("scsi%d : can't determine %s data pointer offset\n",
+ cmd->host->host_no, where);
+ if (ncmd) {
+ size = print_insn (cmd->host,
+ bus_to_virt(ncmd->saved_data_pointer), "", 1);
+ print_insn (cmd->host,
+ bus_to_virt(ncmd->saved_data_pointer) + size * sizeof(u32),
+ "", 1);
+ }
+ }
+ }
+}
+
+
+static void
+print_dsa (struct Scsi_Host *host, u32 *dsa, const char *prefix) {
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ int i, len;
+ char *ptr;
+ Scsi_Cmnd *cmd;
+
+ if (check_address ((unsigned long) dsa, hostdata->dsa_end -
+ hostdata->dsa_start) == -1) {
+ printk("scsi%d : bad dsa virt 0x%p\n", host->host_no, dsa);
+ return;
+ }
+ printk("%sscsi%d : dsa at phys 0x%lx (virt 0x%p)\n"
+ " + %d : dsa_msgout length = %u, data = 0x%x (virt 0x%p)\n" ,
+ prefix ? prefix : "",
+ host->host_no, virt_to_bus (dsa), dsa, hostdata->dsa_msgout,
+ dsa[hostdata->dsa_msgout / sizeof(u32)],
+ dsa[hostdata->dsa_msgout / sizeof(u32) + 1],
+ bus_to_virt (dsa[hostdata->dsa_msgout / sizeof(u32) + 1]));
+
+ /*
+ * Only print messages if they're sane in length so we don't
+ * blow the kernel printk buffer on something which won't buy us
+ * anything.
+ */
+
+ if (dsa[hostdata->dsa_msgout / sizeof(u32)] <
+ sizeof (hostdata->free->select))
+ for (i = dsa[hostdata->dsa_msgout / sizeof(u32)],
+ ptr = bus_to_virt (dsa[hostdata->dsa_msgout / sizeof(u32) + 1]);
+ i > 0 && !check_address ((unsigned long) ptr, 1);
+ ptr += len, i -= len) {
+ printk(" ");
+ len = print_msg (ptr);
+ printk("\n");
+ if (!len)
+ break;
+ }
+
+ printk(" + %d : select_indirect = 0x%x\n",
+ hostdata->dsa_select, dsa[hostdata->dsa_select / sizeof(u32)]);
+ cmd = (Scsi_Cmnd *) bus_to_virt(dsa[hostdata->dsa_cmnd / sizeof(u32)]);
+ printk(" + %d : dsa_cmnd = 0x%x ", hostdata->dsa_cmnd,
+ (u32) virt_to_bus(cmd));
+ if (cmd) {
+ printk(" result = 0x%x, target = %d, lun = %d, cmd = ",
+ cmd->result, cmd->target, cmd->lun);
+ print_command(cmd->cmnd);
+ } else
+ printk("\n");
+ printk(" + %d : dsa_next = 0x%x\n", hostdata->dsa_next,
+ dsa[hostdata->dsa_next / sizeof(u32)]);
+ if (cmd) {
+ printk("scsi%d target %d : sxfer_sanity = 0x%x, scntl3_sanity = 0x%x\n"
+ " script : ",
+ host->host_no, cmd->target,
+ hostdata->sync[cmd->target].sxfer_sanity,
+ hostdata->sync[cmd->target].scntl3_sanity);
+ for (i = 0; i < (sizeof(hostdata->sync[cmd->target].script) / 4); ++i)
+ printk ("0x%x ", hostdata->sync[cmd->target].script[i]);
+ printk ("\n");
+ print_progress (cmd);
+ }
+}
+/*
+ * Function : void print_queues (Scsi_Host *host)
+ *
+ * Purpose : print the contents of the NCR issue and reconnect queues
+ *
+ * Inputs : host - SCSI host we are interested in
+ *
+ */
+
+static void
+print_queues (struct Scsi_Host *host) {
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ u32 *dsa, *next_dsa;
+ volatile u32 *ncrcurrent;
+ int left;
+ Scsi_Cmnd *cmd, *next_cmd;
+ unsigned long flags;
+
+ printk ("scsi%d : issue queue\n", host->host_no);
+
+ for (left = host->can_queue, cmd = (Scsi_Cmnd *) hostdata->issue_queue;
+ left >= 0 && cmd;
+ cmd = next_cmd) {
+ next_cmd = (Scsi_Cmnd *) cmd->SCp.ptr;
+ save_flags(flags);
+ cli();
+ if (cmd->host_scribble) {
+ if (check_address ((unsigned long) (cmd->host_scribble),
+ sizeof (cmd->host_scribble)) == -1)
+ printk ("scsi%d: scsi pid %ld bad pointer to NCR53c7x0_cmd\n",
+ host->host_no, cmd->pid);
+ /* print_dsa does sanity check on address, no need to check */
+ else
+ print_dsa (host, ((struct NCR53c7x0_cmd *) cmd->host_scribble)
+ -> dsa, "");
+ } else
+ printk ("scsi%d : scsi pid %ld for target %d lun %d has no NCR53c7x0_cmd\n",
+ host->host_no, cmd->pid, cmd->target, cmd->lun);
+ restore_flags(flags);
+ }
+
+ if (left <= 0) {
+ printk ("scsi%d : loop detected in issue queue\n",
+ host->host_no);
+ }
+
+ /*
+ * Traverse the NCR reconnect and start DSA structures, printing out
+ * each element until we hit the end or detect a loop. Currently,
+ * the reconnect structure is a linked list; and the start structure
+ * is an array. Eventually, the reconnect structure will become a
+ * list as well, since this simplifies the code.
+ */
+
+ printk ("scsi%d : schedule dsa array :\n", host->host_no);
+ for (left = host->can_queue, ncrcurrent = hostdata->schedule;
+ left > 0; ncrcurrent += 2, --left)
+ if (ncrcurrent[0] != hostdata->NOP_insn)
+/* FIXME : convert pointer to dsa_begin to pointer to dsa. */
+ print_dsa (host, bus_to_virt (ncrcurrent[1] -
+ (hostdata->E_dsa_code_begin -
+ hostdata->E_dsa_code_template)), "");
+ printk ("scsi%d : end schedule dsa array\n", host->host_no);
+
+ printk ("scsi%d : reconnect_dsa_head :\n", host->host_no);
+
+ for (left = host->can_queue,
+ dsa = bus_to_virt (hostdata->reconnect_dsa_head);
+ left >= 0 && dsa;
+ dsa = next_dsa) {
+ save_flags (flags);
+ cli();
+ if (check_address ((unsigned long) dsa, sizeof(dsa)) == -1) {
+ printk ("scsi%d: bad DSA pointer 0x%p", host->host_no,
+ dsa);
+ next_dsa = NULL;
+ }
+ else
+ {
+ next_dsa = bus_to_virt(dsa[hostdata->dsa_next / sizeof(u32)]);
+ print_dsa (host, dsa, "");
+ }
+ restore_flags(flags);
+ }
+ printk ("scsi%d : end reconnect_dsa_head\n", host->host_no);
+ if (left < 0)
+ printk("scsi%d: possible loop in ncr reconnect list\n",
+ host->host_no);
+}
+
+static void
+print_lots (struct Scsi_Host *host) {
+ NCR53c7x0_local_declare();
+ struct NCR53c7x0_hostdata *hostdata =
+ (struct NCR53c7x0_hostdata *) host->hostdata;
+ u32 *dsp_next, *dsp, *dsa, dbc_dcmd;
+ unsigned char dcmd, sbcl;
+ int i, size;
+ NCR53c7x0_local_setup(host);
+
+ if ((dsp_next = bus_to_virt(NCR53c7x0_read32 (DSP_REG)))) {
+ dbc_dcmd = NCR53c7x0_read32(DBC_REG);
+ dcmd = (dbc_dcmd & 0xff000000) >> 24;
+ dsp = dsp_next - NCR53c7x0_insn_size(dcmd);
+ dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
+ sbcl = NCR53c7x0_read8 (SBCL_REG);
+
+ /*
+ * For the 53c710, the following will report value 0 for SCNTL3
+ * and STEST0 - we dont have these registers.
+ */
+ printk ("scsi%d : DCMD|DBC=0x%x, DNAD=0x%x (virt 0x%p)\n"
+ " DSA=0x%lx (virt 0x%p)\n"
+ " DSPS=0x%x, TEMP=0x%x (virt 0x%p), DMODE=0x%x\n"
+ " SXFER=0x%x, SCNTL3=0x%x\n"
+ " %s%s%sphase=%s, %d bytes in SCSI FIFO\n"
+ " STEST0=0x%x\n",
+ host->host_no, dbc_dcmd, NCR53c7x0_read32(DNAD_REG),
+ bus_to_virt(NCR53c7x0_read32(DNAD_REG)),
+ virt_to_bus(dsa), dsa,
+ NCR53c7x0_read32(DSPS_REG), NCR53c7x0_read32(TEMP_REG),
+ bus_to_virt (NCR53c7x0_read32(TEMP_REG)),
+ (int) NCR53c7x0_read8(hostdata->dmode),
+ (int) NCR53c7x0_read8(SXFER_REG),
+ ((hostdata->chip / 100) == 8) ?
+ (int) NCR53c7x0_read8(SCNTL3_REG_800) : 0,
+ (sbcl & SBCL_BSY) ? "BSY " : "",
+ (sbcl & SBCL_SEL) ? "SEL " : "",
+ (sbcl & SBCL_REQ) ? "REQ " : "",
+ sstat2_to_phase(NCR53c7x0_read8 (((hostdata->chip / 100) == 8) ?
+ SSTAT1_REG : SSTAT2_REG)),
+ (NCR53c7x0_read8 ((hostdata->chip / 100) == 8 ?
+ SSTAT1_REG : SSTAT2_REG) & SSTAT2_FF_MASK) >> SSTAT2_FF_SHIFT,
+ ((hostdata->chip / 100) == 8) ?
+ NCR53c7x0_read8 (STEST0_REG_800) : 0);
+ printk ("scsi%d : DSP 0x%lx (virt 0x%p) ->\n", host->host_no,
+ virt_to_bus(dsp), dsp);
+ for (i = 6; i > 0; --i, dsp += size)
+ size = print_insn (host, dsp, "", 1);
+ if (NCR53c7x0_read8 (SCNTL1_REG) & SCNTL1_CON) {
+ if ((hostdata->chip / 100) == 8)
+ printk ("scsi%d : connected (SDID=0x%x, SSID=0x%x)\n",
+ host->host_no, NCR53c7x0_read8 (SDID_REG_800),
+ NCR53c7x0_read8 (SSID_REG_800));
+ else
+ printk ("scsi%d : connected (SDID=0x%x)\n",
+ host->host_no, NCR53c7x0_read8 (SDID_REG_700));
+ print_dsa (host, dsa, "");
+ }
+
+#if 1
+ print_queues (host);
+#endif
+ }
+}
+
+/*
+ * Function : static int shutdown (struct Scsi_Host *host)
+ *
+ * Purpose : does a clean (we hope) shutdown of the NCR SCSI
+ * chip. Use prior to dumping core, unloading the NCR driver,
+ *
+ * Returns : 0 on success
+ */
+static int
+shutdown (struct Scsi_Host *host) {
+ NCR53c7x0_local_declare();
+ unsigned long flags;
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ NCR53c7x0_local_setup(host);
+ save_flags (flags);
+ cli();
+/* Get in a state where we can reset the SCSI bus */
+ ncr_halt (host);
+ ncr_scsi_reset (host);
+ hostdata->soft_reset(host);
+
+ disable (host);
+ restore_flags (flags);
+ return 0;
+}
+
+/*
+ * Function : void ncr_scsi_reset (struct Scsi_Host *host)
+ *
+ * Purpose : reset the SCSI bus.
+ */
+
+static void
+ncr_scsi_reset (struct Scsi_Host *host) {
+ NCR53c7x0_local_declare();
+ unsigned long flags;
+ NCR53c7x0_local_setup(host);
+ save_flags (flags);
+ cli();
+ NCR53c7x0_write8(SCNTL1_REG, SCNTL1_RST);
+ udelay(25); /* Minimum amount of time to assert RST */
+ NCR53c7x0_write8(SCNTL1_REG, 0);
+ restore_flags (flags);
+}
+
+/*
+ * Function : void hard_reset (struct Scsi_Host *host)
+ *
+ */
+
+static void
+hard_reset (struct Scsi_Host *host) {
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ unsigned long flags;
+ save_flags (flags);
+ cli();
+ ncr_scsi_reset(host);
+ NCR53c7x0_driver_init (host);
+ if (hostdata->soft_reset)
+ hostdata->soft_reset (host);
+ restore_flags(flags);
+}
+
+
+/*
+ * Function : Scsi_Cmnd *return_outstanding_commands (struct Scsi_Host *host,
+ * int free, int issue)
+ *
+ * Purpose : return a linked list (using the SCp.buffer field as next,
+ * so we don't perturb hostdata. We don't use a field of the
+ * NCR53c7x0_cmd structure since we may not have allocated one
+ * for the command causing the reset.) of Scsi_Cmnd structures that
+ * had propogated below the Linux issue queue level. If free is set,
+ * free the NCR53c7x0_cmd structures which are associated with
+ * the Scsi_Cmnd structures, and clean up any internal
+ * NCR lists that the commands were on. If issue is set,
+ * also return commands in the issue queue.
+ *
+ * Returns : linked list of commands
+ *
+ * NOTE : the caller should insure that the NCR chip is halted
+ * if the free flag is set.
+ */
+
+static Scsi_Cmnd *
+return_outstanding_commands (struct Scsi_Host *host, int free, int issue) {
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ struct NCR53c7x0_cmd *c;
+ int i;
+ u32 *ncrcurrent;
+ Scsi_Cmnd *list = NULL, *tmp;
+ for (c = (struct NCR53c7x0_cmd *) hostdata->running_list; c;
+ c = (struct NCR53c7x0_cmd *) c->next) {
+ if (c->cmd->SCp.buffer) {
+ printk ("scsi%d : loop detected in running list!\n", host->host_no);
+ break;
+ } else {
+ printk ("The sti() implicit in a printk() prevents hangs\n");
+ break;
+ }
+
+ c->cmd->SCp.buffer = (struct scatterlist *) list;
+ list = c->cmd;
+ if (free) {
+ c->next = hostdata->free;
+ hostdata->free = c;
+ }
+ }
+
+ if (free) {
+ for (i = 0, ncrcurrent = (u32 *) hostdata->schedule;
+ i < host->can_queue; ++i, ncrcurrent += 2) {
+ ncrcurrent[0] = hostdata->NOP_insn;
+ ncrcurrent[1] = 0xdeadbeef;
+ }
+ hostdata->ncrcurrent = NULL;
+ }
+
+ if (issue) {
+ for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; tmp = tmp->next) {
+ if (tmp->SCp.buffer) {
+ printk ("scsi%d : loop detected in issue queue!\n",
+ host->host_no);
+ break;
+ }
+ tmp->SCp.buffer = (struct scatterlist *) list;
+ list = tmp;
+ }
+ if (free)
+ hostdata->issue_queue = NULL;
+
+ }
+ return list;
+}
+
+/*
+ * Function : static int disable (struct Scsi_Host *host)
+ *
+ * Purpose : disables the given NCR host, causing all commands
+ * to return a driver error. Call this so we can unload the
+ * module during development and try again. Eventually,
+ * we should be able to find clean workarounds for these
+ * problems.
+ *
+ * Inputs : host - hostadapter to twiddle
+ *
+ * Returns : 0 on success.
+ */
+
+static int
+disable (struct Scsi_Host *host) {
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ unsigned long flags;
+ Scsi_Cmnd *nuke_list, *tmp;
+ save_flags(flags);
+ cli();
+ if (hostdata->state != STATE_HALTED)
+ ncr_halt (host);
+ nuke_list = return_outstanding_commands (host, 1 /* free */, 1 /* issue */);
+ hard_reset (host);
+ hostdata->state = STATE_DISABLED;
+ restore_flags(flags);
+ printk ("scsi%d : nuking commands\n", host->host_no);
+ for (; nuke_list; nuke_list = tmp) {
+ tmp = (Scsi_Cmnd *) nuke_list->SCp.buffer;
+ nuke_list->result = DID_ERROR << 16;
+ nuke_list->scsi_done(nuke_list);
+ }
+ printk ("scsi%d : done. \n", host->host_no);
+ printk (KERN_ALERT "scsi%d : disabled. Unload and reload\n",
+ host->host_no);
+ return 0;
+}
+
+/*
+ * Function : static int ncr_halt (struct Scsi_Host *host)
+ *
+ * Purpose : halts the SCSI SCRIPTS(tm) processor on the NCR chip
+ *
+ * Inputs : host - SCSI chip to halt
+ *
+ * Returns : 0 on success
+ */
+
+static int
+ncr_halt (struct Scsi_Host *host) {
+ NCR53c7x0_local_declare();
+ unsigned long flags;
+ unsigned char istat, tmp;
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ int stage;
+ NCR53c7x0_local_setup(host);
+
+ save_flags(flags);
+ cli();
+ /* Stage 0 : eat all interrupts
+ Stage 1 : set ABORT
+ Stage 2 : eat all but abort interrupts
+ Stage 3 : eat all interrupts
+ */
+ for (stage = 0;;) {
+ if (stage == 1) {
+ NCR53c7x0_write8(hostdata->istat, ISTAT_ABRT);
+ ++stage;
+ }
+ istat = NCR53c7x0_read8 (hostdata->istat);
+ if (istat & ISTAT_SIP) {
+ tmp = NCR53c7x0_read8(SSTAT0_REG);
+ } else if (istat & ISTAT_DIP) {
+ tmp = NCR53c7x0_read8(DSTAT_REG);
+ if (stage == 2) {
+ if (tmp & DSTAT_ABRT) {
+ NCR53c7x0_write8(hostdata->istat, 0);
+ ++stage;
+ } else {
+ printk(KERN_ALERT "scsi%d : could not halt NCR chip\n",
+ host->host_no);
+ disable (host);
+ }
+ }
+ }
+ if (!(istat & (ISTAT_SIP|ISTAT_DIP)))
+ if (stage == 0)
+ ++stage;
+ else if (stage == 3)
+ break;
+ }
+ hostdata->state = STATE_HALTED;
+ restore_flags(flags);
+#if 0
+ print_lots (host);
+#endif
+ return 0;
+}
+
+/*
+ * Function: event_name (int event)
+ *
+ * Purpose: map event enum into user-readable strings.
+ */
+
+static const char *
+event_name (int event) {
+ switch (event) {
+ case EVENT_NONE: return "none";
+ case EVENT_ISSUE_QUEUE: return "to issue queue";
+ case EVENT_START_QUEUE: return "to start queue";
+ case EVENT_SELECT: return "selected";
+ case EVENT_DISCONNECT: return "disconnected";
+ case EVENT_RESELECT: return "reselected";
+ case EVENT_COMPLETE: return "completed";
+ case EVENT_IDLE: return "idle";
+ case EVENT_SELECT_FAILED: return "select failed";
+ case EVENT_BEFORE_SELECT: return "before select";
+ case EVENT_RESELECT_FAILED: return "reselect failed";
+ default: return "unknown";
+ }
+}
+
+/*
+ * Function : void dump_events (struct Scsi_Host *host, count)
+ *
+ * Purpose : print last count events which have occurred.
+ */
+static void
+dump_events (struct Scsi_Host *host, int count) {
+ struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
+ host->hostdata;
+ struct NCR53c7x0_event event;
+ int i;
+ unsigned long flags;
+ if (hostdata->events) {
+ if (count > hostdata->event_size)
+ count = hostdata->event_size;
+ for (i = hostdata->event_index; count > 0;
+ i = (i ? i - 1 : hostdata->event_size -1), --count) {
+ save_flags(flags);
+/*
+ * By copying the event we're currently examining with interrupts
+ * disabled, we can do multiple printk(), etc. operations and
+ * still be guaranteed that they're happening on the same
+ * event structure.
+ */
+ cli();
+#if 0
+ event = hostdata->events[i];
+#else
+ memcpy ((void *) &event, (void *) &(hostdata->events[i]),
+ sizeof(event));
+#endif
+
+ restore_flags(flags);
+ printk ("scsi%d : %s event %d at %ld secs %ld usecs target %d lun %d\n",
+ host->host_no, event_name (event.event), count,
+ (long) event.time.tv_sec, (long) event.time.tv_usec,
+ event.target, event.lun);
+ if (event.dsa)
+ printk (" event for dsa 0x%lx (virt 0x%p)\n",
+ virt_to_bus(event.dsa), event.dsa);
+ if (event.pid != -1) {
+ printk (" event for pid %ld ", event.pid);
+ print_command (event.cmnd);
+ }
+ }
+ }
+}
+
+/*
+ * Function: check_address
+ *
+ * Purpose: Check to see if a possibly corrupt pointer will fault the
+ * kernel.
+ *
+ * Inputs: addr - address; size - size of area
+ *
+ * Returns: 0 if area is OK, -1 on error.
+ *
+ * NOTES: should be implemented in terms of vverify on kernels
+ * that have it.
+ */
+
+static int
+check_address (unsigned long addr, int size) {
+ return (MAP_NR(addr) < 1 || MAP_NR(addr + size) > MAP_NR(high_memory) ?
+ -1 : 0);
+}
+
+#ifdef MODULE
+int
+NCR53c7x0_release(struct Scsi_Host *host) {
+ struct NCR53c7x0_hostdata *hostdata =
+ (struct NCR53c7x0_hostdata *) host->hostdata;
+ struct NCR53c7x0_cmd *cmd, *tmp;
+ shutdown (host);
+ if (host->irq != IRQ_NONE)
+ {
+ int irq_count;
+ struct Scsi_Host *tmp;
+ for (irq_count = 0, tmp = first_host; tmp; tmp = tmp->next)
+ if (tmp->hostt == the_template && tmp->irq == host->irq)
+ ++irq_count;
+ if (irq_count == 1)
+ free_irq(host->irq, NULL);
+ }
+ if (host->dma_channel != DMA_NONE)
+ free_dma(host->dma_channel);
+ if (host->io_port)
+ release_region(host->io_port, host->n_io_port);
+
+ for (cmd = (struct NCR53c7x0_cmd *) hostdata->free; cmd; cmd = tmp,
+ --hostdata->num_cmds) {
+ tmp = (struct NCR53c7x0_cmd *) cmd->next;
+ /*
+ * If we're going to loop, try to stop it to get a more accurate
+ * count of the leaked commands.
+ */
+ cmd->next = NULL;
+ if (cmd->free)
+ cmd->free ((void *) cmd->real, cmd->size);
+ }
+ if (hostdata->num_cmds)
+ printk ("scsi%d : leaked %d NCR53c7x0_cmd structures\n",
+ host->host_no, hostdata->num_cmds);
+ if (hostdata->events)
+ vfree ((void *)hostdata->events);
+ return 1;
+}
+Scsi_Host_Template driver_template = NCR53c7xx;
+#include "scsi_module.c"
+#endif /* def MODULE */
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