patch-2.4.21 linux-2.4.21/drivers/scsi/sun3_scsi_vme.c

• Lines: 569
• Date: 2003-06-13 07:51:36.000000000 -0700
• Orig file: linux-2.4.20/drivers/scsi/sun3_scsi_vme.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.20/drivers/scsi/sun3_scsi_vme.c linux-2.4.21/drivers/scsi/sun3_scsi_vme.c
@@ -0,0 +1,568 @@
+/*
+ * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl)
+ *
+ * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net)
+ *
+ * VME support added by Sam Creasey
+ *
+ * Adapted from sun3_scsi.c -- see there for other headers
+ *
+ * TODO: modify this driver to support multiple Sun3 SCSI VME boards
+ *
+ */
+
+#define AUTOSENSE
+
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/blk.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+
+#include <asm/sun3ints.h>
+#include <asm/dvma.h>
+#include <asm/idprom.h>
+#include <asm/machines.h>
+
+#define SUN3_SCSI_VME
+
+#undef SUN3_SCSI_DEBUG
+
+/* dma on! */
+#define REAL_DMA
+
+#include "scsi.h"
+#include "hosts.h"
+#include "sun3_scsi.h"
+#include "NCR5380.h"
+#include "constants.h"
+
+extern int sun3_map_test(unsigned long, char *);
+
+#define USE_WRAPPER
+/*#define RESET_BOOT */
+#define DRIVER_SETUP
+
+#define NDEBUG 0
+
+/*
+ * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
+ */
+#ifdef BUG
+#undef RESET_BOOT
+#undef DRIVER_SETUP
+#endif
+
+/* #define SUPPORT_TAGS */
+
+//#define	ENABLE_IRQ()	enable_irq( SUN3_VEC_VMESCSI0 ); 
+#define ENABLE_IRQ()
+
+
+static void scsi_sun3_intr(int irq, void *dummy, struct pt_regs *fp);
+static inline unsigned char sun3scsi_read(int reg);
+static inline void sun3scsi_write(int reg, int value);
+
+static int setup_can_queue = -1;
+MODULE_PARM(setup_can_queue, "i");
+static int setup_cmd_per_lun = -1;
+MODULE_PARM(setup_cmd_per_lun, "i");
+static int setup_sg_tablesize = -1;
+MODULE_PARM(setup_sg_tablesize, "i");
+#ifdef SUPPORT_TAGS
+static int setup_use_tagged_queuing = -1;
+MODULE_PARM(setup_use_tagged_queuing, "i");
+#endif
+static int setup_hostid = -1;
+MODULE_PARM(setup_hostid, "i");
+
+static Scsi_Cmnd *sun3_dma_setup_done = NULL;
+
+#define	AFTER_RESET_DELAY	(HZ/2)
+
+/* ms to wait after hitting dma regs */
+#define SUN3_DMA_DELAY 10
+
+/* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
+#define SUN3_DVMA_BUFSIZE 0xe000
+
+/* minimum number of bytes to do dma on */
+#define SUN3_DMA_MINSIZE 128
+
+static volatile unsigned char *sun3_scsi_regp;
+static volatile struct sun3_dma_regs *dregs;
+#ifdef OLDDMA
+static unsigned char *dmabuf = NULL; /* dma memory buffer */
+#endif
+static unsigned char *sun3_dma_orig_addr = NULL;
+static unsigned long sun3_dma_orig_count = 0;
+static int sun3_dma_active = 0;
+static unsigned long last_residual = 0;
+
+/*
+ * NCR 5380 register access functions
+ */
+
+static inline unsigned char sun3scsi_read(int reg)
+{
+	return( sun3_scsi_regp[reg] );
+}
+
+static inline void sun3scsi_write(int reg, int value)
+{
+	sun3_scsi_regp[reg] = value;
+}
+
+/*
+ * XXX: status debug
+ */
+static struct Scsi_Host *default_instance;
+
+/*
+ * Function : int sun3scsi_detect(Scsi_Host_Template * tpnt)
+ *
+ * Purpose : initializes mac NCR5380 driver based on the
+ *	command line / compile time port and irq definitions.
+ *
+ * Inputs : tpnt - template for this SCSI adapter.
+ *
+ * Returns : 1 if a host adapter was found, 0 if not.
+ *
+ */
+ 
+static int sun3scsi_detect(Scsi_Host_Template * tpnt)
+{
+	unsigned long ioaddr, irq;
+	static int called = 0;
+	struct Scsi_Host *instance;
+	int i;
+	unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI, 
+				   IOBASE_SUN3_VMESCSI + 0x4000,
+				   0 };
+	unsigned long vecs[3] = { SUN3_VEC_VMESCSI0,
+				  SUN3_VEC_VMESCSI1,
+				  0 };
+	/* check that this machine has an onboard 5380 */
+	switch(idprom->id_machtype) {
+	case SM_SUN3|SM_3_160:
+	case SM_SUN3|SM_3_260:
+		break;
+
+	default:
+		return 0;
+	}
+
+	if(called)
+		return 0;
+
+	tpnt->proc_name = "Sun3 5380 VME SCSI";
+
+	/* setup variables */
+	tpnt->can_queue =
+		(setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
+	tpnt->cmd_per_lun =
+		(setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
+	tpnt->sg_tablesize = 
+		(setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
+	
+	if (setup_hostid >= 0)
+		tpnt->this_id = setup_hostid;
+	else {
+		/* use 7 as default */
+		tpnt->this_id = 7;
+	}
+	
+	ioaddr = 0;
+	for(i = 0; addrs[i] != 0; i++) {
+		unsigned char x;
+		
+		ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE,
+						     SUN3_PAGE_TYPE_VME16);
+		irq = vecs[i];
+		sun3_scsi_regp = (unsigned char *)ioaddr;
+		
+		dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
+		
+		if(sun3_map_test((unsigned long)dregs, &x)) {
+			unsigned short oldcsr;
+
+			oldcsr = dregs->csr;
+			dregs->csr = 0;
+			udelay(SUN3_DMA_DELAY);
+			if(dregs->csr == 0x1400)
+				break;
+			
+			dregs->csr = oldcsr;
+		}
+
+		iounmap((void *)ioaddr);
+		ioaddr = 0;
+	}
+
+	if(!ioaddr)
+		return 0;
+	
+#ifdef SUPPORT_TAGS
+	if (setup_use_tagged_queuing < 0)
+		setup_use_tagged_queuing = USE_TAGGED_QUEUING;
+#endif
+
+	instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
+	if(instance == NULL)
+		return 0;
+		
+	default_instance = instance;
+
+        instance->io_port = (unsigned long) ioaddr;
+	instance->irq = irq;
+
+	NCR5380_init(instance, 0);
+
+	instance->n_io_port = 32;
+
+        ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
+
+	if (request_irq(instance->irq, scsi_sun3_intr,
+			     0, "Sun3SCSI-5380VME", NULL)) {
+#ifndef REAL_DMA
+		printk("scsi%d: IRQ%d not free, interrupts disabled\n",
+		       instance->host_no, instance->irq);
+		instance->irq = IRQ_NONE;
+#else
+		printk("scsi%d: IRQ%d not free, bailing out\n",
+		       instance->host_no, instance->irq);
+		return 0;
+#endif
+	}
+
+	printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port);
+	if (instance->irq == IRQ_NONE)
+		printk ("s disabled");
+	else
+		printk (" %d", instance->irq);
+	printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
+	       instance->can_queue, instance->cmd_per_lun,
+	       SUN3SCSI_PUBLIC_RELEASE);
+	printk("\nscsi%d:", instance->host_no);
+	NCR5380_print_options(instance);
+	printk("\n");
+
+	dregs->csr = 0;
+	udelay(SUN3_DMA_DELAY);
+	dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
+	udelay(SUN3_DMA_DELAY);
+	dregs->fifo_count = 0;
+	dregs->fifo_count_hi = 0;
+	dregs->dma_addr_hi = 0;
+	dregs->dma_addr_lo = 0;
+	dregs->dma_count_hi = 0;
+	dregs->dma_count_lo = 0;
+
+	dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
+
+	called = 1;
+
+#ifdef RESET_BOOT
+	sun3_scsi_reset_boot(instance);
+#endif
+
+	return 1;
+}
+
+#ifdef MODULE
+int sun3scsi_release (struct Scsi_Host *shpnt)
+{
+	if (shpnt->irq != IRQ_NONE)
+		free_irq (shpnt->irq, NULL);
+
+	iounmap(sun3_scsi_regp);
+
+	return 0;
+}
+#endif
+
+#ifdef RESET_BOOT
+/*
+ * Our 'bus reset on boot' function
+ */
+
+static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
+{
+	unsigned long end;
+
+	NCR5380_local_declare();
+	NCR5380_setup(instance);
+	
+	/*
+	 * Do a SCSI reset to clean up the bus during initialization. No
+	 * messing with the queues, interrupts, or locks necessary here.
+	 */
+
+	printk( "Sun3 SCSI: resetting the SCSI bus..." );
+
+	/* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
+//       	sun3_disable_irq( IRQ_SUN3_SCSI );
+
+	/* get in phase */
+	NCR5380_write( TARGET_COMMAND_REG,
+		      PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
+
+	/* assert RST */
+	NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
+
+	/* The min. reset hold time is 25us, so 40us should be enough */
+	udelay( 50 );
+
+	/* reset RST and interrupt */
+	NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
+	NCR5380_read( RESET_PARITY_INTERRUPT_REG );
+
+	for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
+		barrier();
+
+	/* switch on SCSI IRQ again */
+//       	sun3_enable_irq( IRQ_SUN3_SCSI );
+
+	printk( " done\n" );
+}
+#endif
+
+static const char * sun3scsi_info (struct Scsi_Host *spnt) {
+    return "";
+}
+
+// safe bits for the CSR
+#define CSR_GOOD 0x060f
+
+static void scsi_sun3_intr(int irq, void *dummy, struct pt_regs *fp)
+{
+	unsigned short csr = dregs->csr;
+
+	dregs->csr &= ~CSR_DMA_ENABLE;
+
+
+#ifdef SUN3_SCSI_DEBUG
+	printk("scsi_intr csr %x\n", csr);
+#endif
+
+	if(csr & ~CSR_GOOD) {
+		if(csr & CSR_DMA_BUSERR) {
+			printk("scsi%d: bus error in dma\n", default_instance->host_no);
+#ifdef SUN3_SCSI_DEBUG
+			printk("scsi: residual %x count %x addr %p dmaaddr %x\n", 
+			       dregs->fifo_count,
+			       dregs->dma_count_lo | (dregs->dma_count_hi << 16),
+			       sun3_dma_orig_addr,
+			       dregs->dma_addr_lo | (dregs->dma_addr_hi << 16));
+#endif
+		}
+
+		if(csr & CSR_DMA_CONFLICT) {
+			printk("scsi%d: dma conflict\n", default_instance->host_no);
+		}
+	}
+
+	if(csr & (CSR_SDB_INT | CSR_DMA_INT))
+		NCR5380_intr(irq, dummy, fp);
+}
+
+/*
+ * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk; 
+ * reentering NCR5380_print_status seems to have ugly side effects
+ */
+
+/* this doesn't seem to get used at all -- sam */
+#if 0
+void sun3_sun3_debug (void)
+{
+	unsigned long flags;
+	NCR5380_local_declare();
+
+	if (default_instance) {
+			save_flags(flags);
+			cli();
+			NCR5380_print_status(default_instance);
+			restore_flags(flags);
+	}
+}
+#endif
+
+
+/* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
+static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
+{
+	void *addr;
+
+	if(sun3_dma_orig_addr != NULL)
+		dvma_unmap(sun3_dma_orig_addr);
+
+//	addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
+	addr = (void *)dvma_map_vme((unsigned long) data, count);
+		
+	sun3_dma_orig_addr = addr;
+	sun3_dma_orig_count = count;
+	
+#ifdef SUN3_SCSI_DEBUG
+	printk("scsi: dma_setup addr %p count %x\n", addr, count);
+#endif
+
+//	dregs->fifo_count = 0;
+#if 0	
+	/* reset fifo */
+	dregs->csr &= ~CSR_FIFO;
+	dregs->csr |= CSR_FIFO;
+#endif	
+	/* set direction */
+	if(write_flag)
+		dregs->csr |= CSR_SEND;
+	else
+		dregs->csr &= ~CSR_SEND;
+	
+	/* reset fifo */
+//	dregs->csr &= ~CSR_FIFO;
+//	dregs->csr |= CSR_FIFO;
+
+	dregs->csr |= CSR_PACK_ENABLE;
+
+	dregs->dma_addr_hi = ((unsigned long)addr >> 16);
+	dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
+	
+	dregs->dma_count_hi = 0;
+	dregs->dma_count_lo = 0;
+	dregs->fifo_count_hi = 0;
+	dregs->fifo_count = 0;
+		
+#ifdef SUN3_SCSI_DEBUG
+	printk("scsi: dma_setup done csr %x\n", dregs->csr);
+#endif
+       	return count;
+
+}
+
+static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
+{
+	return last_residual;
+}
+
+static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted, Scsi_Cmnd *cmd,
+				    int write_flag)
+{
+	if((cmd->request.cmd == 0) || (cmd->request.cmd == 1))
+ 		return wanted;
+	else
+		return 0;
+}
+
+static int sun3scsi_dma_start(unsigned long count, char *data)
+{
+	
+	unsigned short csr;
+
+	csr = dregs->csr;
+#ifdef SUN3_SCSI_DEBUG
+	printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count);
+#endif
+	
+	dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
+	dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
+
+	dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
+	dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
+
+//	if(!(csr & CSR_DMA_ENABLE))
+//		dregs->csr |= CSR_DMA_ENABLE;
+
+	return 0;
+}
+
+/* clean up after our dma is done */
+static int sun3scsi_dma_finish(int write_flag)
+{
+	unsigned short fifo;
+	int ret = 0;
+	
+	sun3_dma_active = 0;
+
+	dregs->csr &= ~CSR_DMA_ENABLE;
+	
+	fifo = dregs->fifo_count;
+	if(write_flag) {
+		if((fifo > 0) && (fifo < sun3_dma_orig_count))
+			fifo++;
+	}
+
+	last_residual = fifo;
+#ifdef SUN3_SCSI_DEBUG
+	printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count);
+#endif
+	/* empty bytes from the fifo which didn't make it */
+	if((!write_flag) && (dregs->csr & CSR_LEFT)) {
+		unsigned char *vaddr;
+
+#ifdef SUN3_SCSI_DEBUG
+		printk("scsi: got left over bytes\n");
+#endif
+
+		vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
+		
+		vaddr += (sun3_dma_orig_count - fifo);
+		vaddr--;
+		
+		switch(dregs->csr & CSR_LEFT) {
+		case CSR_LEFT_3:
+			*vaddr = (dregs->bpack_lo & 0xff00) >> 8;
+			vaddr--;
+			
+		case CSR_LEFT_2:
+			*vaddr = (dregs->bpack_hi & 0x00ff);
+			vaddr--;
+			
+		case CSR_LEFT_1:
+			*vaddr = (dregs->bpack_hi & 0xff00) >> 8;
+			break;
+		}
+		
+		
+	}
+
+	dvma_unmap(sun3_dma_orig_addr);
+	sun3_dma_orig_addr = NULL;
+
+	dregs->dma_addr_hi = 0;
+	dregs->dma_addr_lo = 0;
+	dregs->dma_count_hi = 0;
+	dregs->dma_count_lo = 0;
+
+	dregs->fifo_count = 0;
+	dregs->fifo_count_hi = 0;
+
+	dregs->csr &= ~CSR_SEND;
+	
+//	dregs->csr |= CSR_DMA_ENABLE;
+	
+#if 0
+	/* reset fifo */
+	dregs->csr &= ~CSR_FIFO;
+	dregs->csr |= CSR_FIFO;
+#endif	
+	sun3_dma_setup_done = NULL;
+
+	return ret;
+
+}
+
+#include "sun3_NCR5380.c"
+
+static Scsi_Host_Template driver_template = SUN3_NCR5380;
+
+#include "scsi_module.c"
+