patch-2.3.99-pre1 linux/drivers/block/cmd640.c
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- Lines: 856
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.3.51/linux/drivers/block/cmd640.c
- Orig date:
Sat Feb 26 22:31:43 2000
diff -u --recursive --new-file v2.3.51/linux/drivers/block/cmd640.c linux/drivers/block/cmd640.c
@@ -1,855 +0,0 @@
-/*
- * linux/drivers/block/cmd640.c Version 1.02 Sep 01, 1996
- *
- * Copyright (C) 1995-1996 Linus Torvalds & authors (see below)
- */
-
-/*
- * Original authors: abramov@cecmow.enet.dec.com (Igor Abramov)
- * mlord@pobox.com (Mark Lord)
- *
- * See linux/MAINTAINERS for address of current maintainer.
- *
- * This file provides support for the advanced features and bugs
- * of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
- *
- * These chips are basically fucked by design, and getting this driver
- * to work on every motherboard design that uses this screwed chip seems
- * bloody well impossible. However, we're still trying.
- *
- * Version 0.97 worked for everybody.
- *
- * User feedback is essential. Many thanks to the beta test team:
- *
- * A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com,
- * bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz,
- * chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,
- * derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,
- * flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net,
- * j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,
- * kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,
- * peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com,
- * s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net,
- * steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com
- * liug@mama.indstate.edu, and others.
- *
- * Version 0.01 Initial version, hacked out of ide.c,
- * and #include'd rather than compiled separately.
- * This will get cleaned up in a subsequent release.
- *
- * Version 0.02 Fixes for vlb initialization code, enable prefetch
- * for versions 'B' and 'C' of chip by default,
- * some code cleanup.
- *
- * Version 0.03 Added reset of secondary interface,
- * and black list for devices which are not compatible
- * with prefetch mode. Separate function for setting
- * prefetch is added, possibly it will be called some
- * day from ioctl processing code.
- *
- * Version 0.04 Now configs/compiles separate from ide.c
- *
- * Version 0.05 Major rewrite of interface timing code.
- * Added new function cmd640_set_mode to set PIO mode
- * from ioctl call. New drives added to black list.
- *
- * Version 0.06 More code cleanup. Prefetch is enabled only for
- * detected hard drives, not included in prefetch
- * black list.
- *
- * Version 0.07 Changed to more conservative drive tuning policy.
- * Unknown drives, which report PIO < 4 are set to
- * (reported_PIO - 1) if it is supported, or to PIO0.
- * List of known drives extended by info provided by
- * CMD at their ftp site.
- *
- * Version 0.08 Added autotune/noautotune support.
- *
- * Version 0.09 Try to be smarter about 2nd port enabling.
- * Version 0.10 Be nice and don't reset 2nd port.
- * Version 0.11 Try to handle more wierd situations.
- *
- * Version 0.12 Lots of bug fixes from Laszlo Peter
- * irq unmasking disabled for reliability.
- * try to be even smarter about the second port.
- * tidy up source code formatting.
- * Version 0.13 permit irq unmasking again.
- * Version 0.90 massive code cleanup, some bugs fixed.
- * defaults all drives to PIO mode0, prefetch off.
- * autotune is OFF by default, with compile time flag.
- * prefetch can be turned OFF/ON using "hdparm -p8/-p9"
- * (requires hdparm-3.1 or newer)
- * Version 0.91 first release to linux-kernel list.
- * Version 0.92 move initial reg dump to separate callable function
- * change "readahead" to "prefetch" to avoid confusion
- * Version 0.95 respect original BIOS timings unless autotuning.
- * tons of code cleanup and rearrangement.
- * added CONFIG_BLK_DEV_CMD640_ENHANCED option
- * prevent use of unmask when prefetch is on
- * Version 0.96 prevent use of io_32bit when prefetch is off
- * Version 0.97 fix VLB secondary interface for sjd@slip.net
- * other minor tune-ups: 0.96 was very good.
- * Version 0.98 ignore PCI version when disabled by BIOS
- * Version 0.99 display setup/active/recovery clocks with PIO mode
- * Version 1.00 Mmm.. cannot depend on PCMD_ENA in all systems
- * Version 1.01 slow/fast devsel can be selected with "hdparm -p6/-p7"
- * ("fast" is necessary for 32bit I/O in some systems)
- * Version 1.02 fix bug that resulted in slow "setup times"
- * (patch courtesy of Zoltan Hidvegi)
- */
-
-#undef REALLY_SLOW_IO /* most systems can safely undef this */
-#define CMD640_PREFETCH_MASKS 1
-
-#include <linux/config.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/timer.h>
-#include <linux/mm.h>
-#include <linux/ioport.h>
-#include <linux/blkdev.h>
-#include <linux/hdreg.h>
-#include <linux/ide.h>
-
-#include <asm/io.h>
-
-#include "ide_modes.h"
-
-/*
- * This flag is set in ide.c by the parameter: ide0=cmd640_vlb
- */
-int cmd640_vlb = 0;
-
-/*
- * CMD640 specific registers definition.
- */
-
-#define VID 0x00
-#define DID 0x02
-#define PCMD 0x04
-#define PCMD_ENA 0x01
-#define PSTTS 0x06
-#define REVID 0x08
-#define PROGIF 0x09
-#define SUBCL 0x0a
-#define BASCL 0x0b
-#define BaseA0 0x10
-#define BaseA1 0x14
-#define BaseA2 0x18
-#define BaseA3 0x1c
-#define INTLINE 0x3c
-#define INPINE 0x3d
-
-#define CFR 0x50
-#define CFR_DEVREV 0x03
-#define CFR_IDE01INTR 0x04
-#define CFR_DEVID 0x18
-#define CFR_AT_VESA_078h 0x20
-#define CFR_DSA1 0x40
-#define CFR_DSA0 0x80
-
-#define CNTRL 0x51
-#define CNTRL_DIS_RA0 0x40
-#define CNTRL_DIS_RA1 0x80
-#define CNTRL_ENA_2ND 0x08
-
-#define CMDTIM 0x52
-#define ARTTIM0 0x53
-#define DRWTIM0 0x54
-#define ARTTIM1 0x55
-#define DRWTIM1 0x56
-#define ARTTIM23 0x57
-#define ARTTIM23_DIS_RA2 0x04
-#define ARTTIM23_DIS_RA3 0x08
-#define DRWTIM23 0x58
-#define BRST 0x59
-
-/*
- * Registers and masks for easy access by drive index:
- */
-static byte prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
-static byte prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};
-
-#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
-
-static byte arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
-static byte drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};
-
-/*
- * Current cmd640 timing values for each drive.
- * The defaults for each are the slowest possible timings.
- */
-static byte setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */
-static byte active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */
-static byte recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */
-
-#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
-
-/*
- * These are initialized to point at the devices we control
- */
-static ide_hwif_t *cmd_hwif0, *cmd_hwif1;
-static ide_drive_t *cmd_drives[4];
-
-/*
- * Interface to access cmd640x registers
- */
-static unsigned int cmd640_key;
-static void (*put_cmd640_reg)(unsigned short reg, byte val);
-static byte (*get_cmd640_reg)(unsigned short reg);
-
-/*
- * This is read from the CFR reg, and is used in several places.
- */
-static unsigned int cmd640_chip_version;
-
-/*
- * The CMD640x chip does not support DWORD config write cycles, but some
- * of the BIOSes use them to implement the config services.
- * Therefore, we must use direct IO instead.
- */
-
-/* PCI method 1 access */
-
-static void put_cmd640_reg_pci1 (unsigned short reg, byte val)
-{
- unsigned long flags;
-
- save_flags(flags);
- cli();
- outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
- outb_p(val, (reg & 3) | 0xcfc);
- restore_flags(flags);
-}
-
-static byte get_cmd640_reg_pci1 (unsigned short reg)
-{
- byte b;
- unsigned long flags;
-
- save_flags(flags);
- cli();
- outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
- b = inb_p((reg & 3) | 0xcfc);
- restore_flags(flags);
- return b;
-}
-
-/* PCI method 2 access (from CMD datasheet) */
-
-static void put_cmd640_reg_pci2 (unsigned short reg, byte val)
-{
- unsigned long flags;
-
- save_flags(flags);
- cli();
- outb_p(0x10, 0xcf8);
- outb_p(val, cmd640_key + reg);
- outb_p(0, 0xcf8);
- restore_flags(flags);
-}
-
-static byte get_cmd640_reg_pci2 (unsigned short reg)
-{
- byte b;
- unsigned long flags;
-
- save_flags(flags);
- cli();
- outb_p(0x10, 0xcf8);
- b = inb_p(cmd640_key + reg);
- outb_p(0, 0xcf8);
- restore_flags(flags);
- return b;
-}
-
-/* VLB access */
-
-static void put_cmd640_reg_vlb (unsigned short reg, byte val)
-{
- unsigned long flags;
-
- save_flags(flags);
- cli();
- outb_p(reg, cmd640_key);
- outb_p(val, cmd640_key + 4);
- restore_flags(flags);
-}
-
-static byte get_cmd640_reg_vlb (unsigned short reg)
-{
- byte b;
- unsigned long flags;
-
- save_flags(flags);
- cli();
- outb_p(reg, cmd640_key);
- b = inb_p(cmd640_key + 4);
- restore_flags(flags);
- return b;
-}
-
-static int __init match_pci_cmd640_device (void)
-{
- const byte ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
- unsigned int i;
- for (i = 0; i < 4; i++) {
- if (get_cmd640_reg(i) != ven_dev[i])
- return 0;
- }
-#ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
- if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
- printk("ide: cmd640 on PCI disabled by BIOS\n");
- return 0;
- }
-#endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
- return 1; /* success */
-}
-
-/*
- * Probe for CMD640x -- pci method 1
- */
-static int __init probe_for_cmd640_pci1 (void)
-{
- get_cmd640_reg = get_cmd640_reg_pci1;
- put_cmd640_reg = put_cmd640_reg_pci1;
- for (cmd640_key = 0x80000000; cmd640_key <= 0x8000f800; cmd640_key += 0x800) {
- if (match_pci_cmd640_device())
- return 1; /* success */
- }
- return 0;
-}
-
-/*
- * Probe for CMD640x -- pci method 2
- */
-static int __init probe_for_cmd640_pci2 (void)
-{
- get_cmd640_reg = get_cmd640_reg_pci2;
- put_cmd640_reg = put_cmd640_reg_pci2;
- for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
- if (match_pci_cmd640_device())
- return 1; /* success */
- }
- return 0;
-}
-
-/*
- * Probe for CMD640x -- vlb
- */
-static int __init probe_for_cmd640_vlb (void)
-{
- byte b;
-
- get_cmd640_reg = get_cmd640_reg_vlb;
- put_cmd640_reg = put_cmd640_reg_vlb;
- cmd640_key = 0x178;
- b = get_cmd640_reg(CFR);
- if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
- cmd640_key = 0x78;
- b = get_cmd640_reg(CFR);
- if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
- return 0;
- }
- return 1; /* success */
-}
-
-/*
- * Returns 1 if an IDE interface/drive exists at 0x170,
- * Returns 0 otherwise.
- */
-static int __init secondary_port_responding (void)
-{
- unsigned long flags;
-
- save_flags(flags);
- cli();
-
- outb_p(0x0a, 0x170 + IDE_SELECT_OFFSET); /* select drive0 */
- udelay(100);
- if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x0a) {
- outb_p(0x1a, 0x170 + IDE_SELECT_OFFSET); /* select drive1 */
- udelay(100);
- if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x1a) {
- restore_flags(flags);
- return 0; /* nothing responded */
- }
- }
- restore_flags(flags);
- return 1; /* success */
-}
-
-#ifdef CMD640_DUMP_REGS
-/*
- * Dump out all cmd640 registers. May be called from ide.c
- */
-void cmd640_dump_regs (void)
-{
- unsigned int reg = cmd640_vlb ? 0x50 : 0x00;
-
- /* Dump current state of chip registers */
- printk("ide: cmd640 internal register dump:");
- for (; reg <= 0x59; reg++) {
- if (!(reg & 0x0f))
- printk("\n%04x:", reg);
- printk(" %02x", get_cmd640_reg(reg));
- }
- printk("\n");
-}
-#endif
-
-/*
- * Check whether prefetch is on for a drive,
- * and initialize the unmask flags for safe operation.
- */
-static void __init check_prefetch (unsigned int index)
-{
- ide_drive_t *drive = cmd_drives[index];
- byte b = get_cmd640_reg(prefetch_regs[index]);
-
- if (b & prefetch_masks[index]) { /* is prefetch off? */
- drive->no_unmask = 0;
- drive->no_io_32bit = 1;
- drive->io_32bit = 0;
- } else {
-#if CMD640_PREFETCH_MASKS
- drive->no_unmask = 1;
- drive->unmask = 0;
-#endif
- drive->no_io_32bit = 0;
- }
-}
-
-/*
- * Figure out which devices we control
- */
-static void __init setup_device_ptrs (void)
-{
- unsigned int i;
-
- cmd_hwif0 = &ide_hwifs[0]; /* default, if not found below */
- cmd_hwif1 = &ide_hwifs[1]; /* default, if not found below */
- for (i = 0; i < MAX_HWIFS; i++) {
- ide_hwif_t *hwif = &ide_hwifs[i];
- if (hwif->chipset == ide_unknown || hwif->chipset == ide_generic) {
- if (hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0)
- cmd_hwif0 = hwif;
- else if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
- cmd_hwif1 = hwif;
- }
- }
- cmd_drives[0] = &cmd_hwif0->drives[0];
- cmd_drives[1] = &cmd_hwif0->drives[1];
- cmd_drives[2] = &cmd_hwif1->drives[0];
- cmd_drives[3] = &cmd_hwif1->drives[1];
-}
-
-#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
-
-/*
- * Sets prefetch mode for a drive.
- */
-static void set_prefetch_mode (unsigned int index, int mode)
-{
- ide_drive_t *drive = cmd_drives[index];
- int reg = prefetch_regs[index];
- byte b;
- unsigned long flags;
-
- save_flags(flags);
- cli();
- b = get_cmd640_reg(reg);
- if (mode) { /* want prefetch on? */
-#if CMD640_PREFETCH_MASKS
- drive->no_unmask = 1;
- drive->unmask = 0;
-#endif
- drive->no_io_32bit = 0;
- b &= ~prefetch_masks[index]; /* enable prefetch */
- } else {
- drive->no_unmask = 0;
- drive->no_io_32bit = 1;
- drive->io_32bit = 0;
- b |= prefetch_masks[index]; /* disable prefetch */
- }
- put_cmd640_reg(reg, b);
- restore_flags(flags);
-}
-
-/*
- * Dump out current drive clocks settings
- */
-static void display_clocks (unsigned int index)
-{
- byte active_count, recovery_count;
-
- active_count = active_counts[index];
- if (active_count == 1)
- ++active_count;
- recovery_count = recovery_counts[index];
- if (active_count > 3 && recovery_count == 1)
- ++recovery_count;
- if (cmd640_chip_version > 1)
- recovery_count += 1; /* cmd640b uses (count + 1)*/
- printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
-}
-
-/*
- * Pack active and recovery counts into single byte representation
- * used by controller
- */
-inline static byte pack_nibbles (byte upper, byte lower)
-{
- return ((upper & 0x0f) << 4) | (lower & 0x0f);
-}
-
-/*
- * This routine retrieves the initial drive timings from the chipset.
- */
-static void __init retrieve_drive_counts (unsigned int index)
-{
- byte b;
-
- /*
- * Get the internal setup timing, and convert to clock count
- */
- b = get_cmd640_reg(arttim_regs[index]) & ~0x3f;
- switch (b) {
- case 0x00: b = 4; break;
- case 0x80: b = 3; break;
- case 0x40: b = 2; break;
- default: b = 5; break;
- }
- setup_counts[index] = b;
-
- /*
- * Get the active/recovery counts
- */
- b = get_cmd640_reg(drwtim_regs[index]);
- active_counts[index] = (b >> 4) ? (b >> 4) : 0x10;
- recovery_counts[index] = (b & 0x0f) ? (b & 0x0f) : 0x10;
-}
-
-
-/*
- * This routine writes the prepared setup/active/recovery counts
- * for a drive into the cmd640 chipset registers to active them.
- */
-static void program_drive_counts (unsigned int index)
-{
- unsigned long flags;
- byte setup_count = setup_counts[index];
- byte active_count = active_counts[index];
- byte recovery_count = recovery_counts[index];
-
- /*
- * Set up address setup count and drive read/write timing registers.
- * Primary interface has individual count/timing registers for
- * each drive. Secondary interface has one common set of registers,
- * so we merge the timings, using the slowest value for each timing.
- */
- if (index > 1) {
- unsigned int mate;
- if (cmd_drives[mate = index ^ 1]->present) {
- if (setup_count < setup_counts[mate])
- setup_count = setup_counts[mate];
- if (active_count < active_counts[mate])
- active_count = active_counts[mate];
- if (recovery_count < recovery_counts[mate])
- recovery_count = recovery_counts[mate];
- }
- }
-
- /*
- * Convert setup_count to internal chipset representation
- */
- switch (setup_count) {
- case 4: setup_count = 0x00; break;
- case 3: setup_count = 0x80; break;
- case 1:
- case 2: setup_count = 0x40; break;
- default: setup_count = 0xc0; /* case 5 */
- }
-
- /*
- * Now that everything is ready, program the new timings
- */
- save_flags (flags);
- cli();
- /*
- * Program the address_setup clocks into ARTTIM reg,
- * and then the active/recovery counts into the DRWTIM reg
- * (this converts counts of 16 into counts of zero -- okay).
- */
- setup_count |= get_cmd640_reg(arttim_regs[index]) & 0x3f;
- put_cmd640_reg(arttim_regs[index], setup_count);
- put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
- restore_flags(flags);
-}
-
-/*
- * Set a specific pio_mode for a drive
- */
-static void cmd640_set_mode (unsigned int index, byte pio_mode, unsigned int cycle_time)
-{
- int setup_time, active_time, recovery_time, clock_time;
- byte setup_count, active_count, recovery_count, recovery_count2, cycle_count;
- int bus_speed = ide_system_bus_speed();
-
- if (pio_mode > 5)
- pio_mode = 5;
- setup_time = ide_pio_timings[pio_mode].setup_time;
- active_time = ide_pio_timings[pio_mode].active_time;
- recovery_time = cycle_time - (setup_time + active_time);
- clock_time = 1000 / bus_speed;
- cycle_count = (cycle_time + clock_time - 1) / clock_time;
-
- setup_count = (setup_time + clock_time - 1) / clock_time;
-
- active_count = (active_time + clock_time - 1) / clock_time;
- if (active_count < 2)
- active_count = 2; /* minimum allowed by cmd640 */
-
- recovery_count = (recovery_time + clock_time - 1) / clock_time;
- recovery_count2 = cycle_count - (setup_count + active_count);
- if (recovery_count2 > recovery_count)
- recovery_count = recovery_count2;
- if (recovery_count < 2)
- recovery_count = 2; /* minimum allowed by cmd640 */
- if (recovery_count > 17) {
- active_count += recovery_count - 17;
- recovery_count = 17;
- }
- if (active_count > 16)
- active_count = 16; /* maximum allowed by cmd640 */
- if (cmd640_chip_version > 1)
- recovery_count -= 1; /* cmd640b uses (count + 1)*/
- if (recovery_count > 16)
- recovery_count = 16; /* maximum allowed by cmd640 */
-
- setup_counts[index] = setup_count;
- active_counts[index] = active_count;
- recovery_counts[index] = recovery_count;
-
- /*
- * In a perfect world, we might set the drive pio mode here
- * (using WIN_SETFEATURE) before continuing.
- *
- * But we do not, because:
- * 1) this is the wrong place to do it (proper is do_special() in ide.c)
- * 2) in practice this is rarely, if ever, necessary
- */
- program_drive_counts (index);
-}
-
-/*
- * Drive PIO mode selection:
- */
-static void cmd640_tune_drive (ide_drive_t *drive, byte mode_wanted)
-{
- byte b;
- ide_pio_data_t d;
- unsigned int index = 0;
-
- while (drive != cmd_drives[index]) {
- if (++index > 3) {
- printk("%s: bad news in cmd640_tune_drive\n", drive->name);
- return;
- }
- }
- switch (mode_wanted) {
- case 6: /* set fast-devsel off */
- case 7: /* set fast-devsel on */
- mode_wanted &= 1;
- b = get_cmd640_reg(CNTRL) & ~0x27;
- if (mode_wanted)
- b |= 0x27;
- put_cmd640_reg(CNTRL, b);
- printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, mode_wanted ? "en" : "dis");
- return;
-
- case 8: /* set prefetch off */
- case 9: /* set prefetch on */
- mode_wanted &= 1;
- set_prefetch_mode(index, mode_wanted);
- printk("%s: %sabled cmd640 prefetch\n", drive->name, mode_wanted ? "en" : "dis");
- return;
- }
-
- (void) ide_get_best_pio_mode (drive, mode_wanted, 5, &d);
- cmd640_set_mode (index, d.pio_mode, d.cycle_time);
-
- printk ("%s: selected cmd640 PIO mode%d (%dns)%s",
- drive->name,
- d.pio_mode,
- d.cycle_time,
- d.overridden ? " (overriding vendor mode)" : "");
- display_clocks(index);
- return;
-}
-
-#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
-
-/*
- * Probe for a cmd640 chipset, and initialize it if found. Called from ide.c
- */
-int __init ide_probe_for_cmd640x (void)
-{
-#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
- int second_port_toggled = 0;
-#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
- int second_port_cmd640 = 0;
- const char *bus_type, *port2;
- unsigned int index;
- byte b, cfr;
-
- if (cmd640_vlb && probe_for_cmd640_vlb()) {
- bus_type = "VLB";
- } else {
- cmd640_vlb = 0;
- if (probe_for_cmd640_pci1())
- bus_type = "PCI (type1)";
- else if (probe_for_cmd640_pci2())
- bus_type = "PCI (type2)";
- else
- return 0;
- }
- /*
- * Undocumented magic (there is no 0x5b reg in specs)
- */
- put_cmd640_reg(0x5b, 0xbd);
- if (get_cmd640_reg(0x5b) != 0xbd) {
- printk("ide: cmd640 init failed: wrong value in reg 0x5b\n");
- return 0;
- }
- put_cmd640_reg(0x5b, 0);
-
-#ifdef CMD640_DUMP_REGS
- CMD640_DUMP_REGS;
-#endif
-
- /*
- * Documented magic begins here
- */
- cfr = get_cmd640_reg(CFR);
- cmd640_chip_version = cfr & CFR_DEVREV;
- if (cmd640_chip_version == 0) {
- printk ("ide: bad cmd640 revision: %d\n", cmd640_chip_version);
- return 0;
- }
-
- /*
- * Initialize data for primary port
- */
- setup_device_ptrs ();
- printk("%s: buggy cmd640%c interface on %s, config=0x%02x\n",
- cmd_hwif0->name, 'a' + cmd640_chip_version - 1, bus_type, cfr);
- cmd_hwif0->chipset = ide_cmd640;
-#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
- cmd_hwif0->tuneproc = &cmd640_tune_drive;
-#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
-
- /*
- * Ensure compatibility by always using the slowest timings
- * for access to the drive's command register block,
- * and reset the prefetch burstsize to default (512 bytes).
- *
- * Maybe we need a way to NOT do these on *some* systems?
- */
- put_cmd640_reg(CMDTIM, 0);
- put_cmd640_reg(BRST, 0x40);
-
- /*
- * Try to enable the secondary interface, if not already enabled
- */
- if (cmd_hwif1->noprobe) {
- port2 = "not probed";
- } else {
- b = get_cmd640_reg(CNTRL);
- if (secondary_port_responding()) {
- if ((b & CNTRL_ENA_2ND)) {
- second_port_cmd640 = 1;
- port2 = "okay";
- } else if (cmd640_vlb) {
- second_port_cmd640 = 1;
- port2 = "alive";
- } else
- port2 = "not cmd640";
- } else {
- put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */
- if (secondary_port_responding()) {
- second_port_cmd640 = 1;
-#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
- second_port_toggled = 1;
-#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
- port2 = "enabled";
- } else {
- put_cmd640_reg(CNTRL, b); /* restore original setting */
- port2 = "not responding";
- }
- }
- }
-
- /*
- * Initialize data for secondary cmd640 port, if enabled
- */
- if (second_port_cmd640) {
- cmd_hwif0->serialized = 1;
- cmd_hwif1->serialized = 1;
- cmd_hwif1->chipset = ide_cmd640;
- cmd_hwif0->mate = cmd_hwif1;
- cmd_hwif1->mate = cmd_hwif0;
- cmd_hwif1->channel = 1;
-#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
- cmd_hwif1->tuneproc = &cmd640_tune_drive;
-#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
- }
- printk("%s: %sserialized, secondary interface %s\n", cmd_hwif1->name,
- cmd_hwif0->serialized ? "" : "not ", port2);
-
- /*
- * Establish initial timings/prefetch for all drives.
- * Do not unnecessarily disturb any prior BIOS setup of these.
- */
- for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) {
- ide_drive_t *drive = cmd_drives[index];
-#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
- if (drive->autotune || ((index > 1) && second_port_toggled)) {
- /*
- * Reset timing to the slowest speed and turn off prefetch.
- * This way, the drive identify code has a better chance.
- */
- setup_counts [index] = 4; /* max possible */
- active_counts [index] = 16; /* max possible */
- recovery_counts [index] = 16; /* max possible */
- program_drive_counts (index);
- set_prefetch_mode (index, 0);
- printk("cmd640: drive%d timings/prefetch cleared\n", index);
- } else {
- /*
- * Record timings/prefetch without changing them.
- * This preserves any prior BIOS setup.
- */
- retrieve_drive_counts (index);
- check_prefetch (index);
- printk("cmd640: drive%d timings/prefetch(%s) preserved",
- index, drive->no_io_32bit ? "off" : "on");
- display_clocks(index);
- }
-#else
- /*
- * Set the drive unmask flags to match the prefetch setting
- */
- check_prefetch (index);
- printk("cmd640: drive%d timings/prefetch(%s) preserved\n",
- index, drive->no_io_32bit ? "off" : "on");
-#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
- }
-
-#ifdef CMD640_DUMP_REGS
- CMD640_DUMP_REGS;
-#endif
- return 1;
-}
-
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TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)