Initial import

1 files changed, 685 insertions, 0 deletions

diff --git a/drivers/scsi/sun3_scsi.c b/drivers/scsi/sun3_scsi.c
new file mode 100644
index 000000000..22a42836d
--- /dev/null
+++ b/drivers/scsi/sun3_scsi.c
@@ -0,0 +1,685 @@
+/*
+ * 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
+ *
+ * TODO: modify this driver to support multiple Sun3 SCSI VME boards
+ *
+ * Adapted from mac_scsinew.c:
+ */
+/*
+ * Generic Macintosh NCR5380 driver
+ *
+ * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
+ *
+ * derived in part from:
+ */
+/*
+ * Generic Generic NCR5380 driver
+ *
+ * Copyright 1995, Russell King
+ */
+
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include <asm/dvma.h>
+
+#include <scsi/scsi_host.h>
+#include "sun3_scsi.h"
+
+/* Definitions for the core NCR5380 driver. */
+
+#define REAL_DMA
+/* #define SUPPORT_TAGS */
+/* minimum number of bytes to do dma on */
+#define DMA_MIN_SIZE                    129
+
+/* #define MAX_TAGS                     32 */
+
+#define NCR5380_implementation_fields   /* none */
+
+#define NCR5380_read(reg)               sun3scsi_read(reg)
+#define NCR5380_write(reg, value)       sun3scsi_write(reg, value)
+
+#define NCR5380_queue_command           sun3scsi_queue_command
+#define NCR5380_bus_reset               sun3scsi_bus_reset
+#define NCR5380_abort                   sun3scsi_abort
+#define NCR5380_show_info               sun3scsi_show_info
+#define NCR5380_info                    sun3scsi_info
+
+#define NCR5380_dma_read_setup(instance, data, count) \
+        sun3scsi_dma_setup(data, count, 0)
+#define NCR5380_dma_write_setup(instance, data, count) \
+        sun3scsi_dma_setup(data, count, 1)
+#define NCR5380_dma_residual(instance) \
+        sun3scsi_dma_residual(instance)
+#define NCR5380_dma_xfer_len(instance, cmd, phase) \
+        sun3scsi_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO))
+
+#define NCR5380_acquire_dma_irq(instance)    (1)
+#define NCR5380_release_dma_irq(instance)
+
+#include "NCR5380.h"
+
+
+extern int sun3_map_test(unsigned long, char *);
+
+static int setup_can_queue = -1;
+module_param(setup_can_queue, int, 0);
+static int setup_cmd_per_lun = -1;
+module_param(setup_cmd_per_lun, int, 0);
+static int setup_sg_tablesize = -1;
+module_param(setup_sg_tablesize, int, 0);
+#ifdef SUPPORT_TAGS
+static int setup_use_tagged_queuing = -1;
+module_param(setup_use_tagged_queuing, int, 0);
+#endif
+static int setup_hostid = -1;
+module_param(setup_hostid, int, 0);
+
+/* #define RESET_BOOT */
+
+#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
+
+static struct scsi_cmnd *sun3_dma_setup_done;
+static unsigned char *sun3_scsi_regp;
+static volatile struct sun3_dma_regs *dregs;
+static struct sun3_udc_regs *udc_regs;
+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;
+static struct Scsi_Host *default_instance;
+
+/*
+ * NCR 5380 register access functions
+ */
+
+static inline unsigned char sun3scsi_read(int reg)
+{
+	return in_8(sun3_scsi_regp + reg);
+}
+
+static inline void sun3scsi_write(int reg, int value)
+{
+	out_8(sun3_scsi_regp + reg, value);
+}
+
+#ifndef SUN3_SCSI_VME
+/* dma controller register access functions */
+
+static inline unsigned short sun3_udc_read(unsigned char reg)
+{
+	unsigned short ret;
+
+	dregs->udc_addr = UDC_CSR;
+	udelay(SUN3_DMA_DELAY);
+	ret = dregs->udc_data;
+	udelay(SUN3_DMA_DELAY);
+	
+	return ret;
+}
+
+static inline void sun3_udc_write(unsigned short val, unsigned char reg)
+{
+	dregs->udc_addr = reg;
+	udelay(SUN3_DMA_DELAY);
+	dregs->udc_data = val;
+	udelay(SUN3_DMA_DELAY);
+}
+#endif
+
+#ifdef RESET_BOOT
+static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
+{
+	unsigned long end;
+	
+	/*
+	 * 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
+
+// safe bits for the CSR
+#define CSR_GOOD 0x060f
+
+static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
+{
+	unsigned short csr = dregs->csr;
+	int handled = 0;
+
+#ifdef SUN3_SCSI_VME
+	dregs->csr &= ~CSR_DMA_ENABLE;
+#endif
+
+	if(csr & ~CSR_GOOD) {
+		if(csr & CSR_DMA_BUSERR) {
+			printk("scsi%d: bus error in dma\n", default_instance->host_no);
+		}
+
+		if(csr & CSR_DMA_CONFLICT) {
+			printk("scsi%d: dma conflict\n", default_instance->host_no);
+		}
+		handled = 1;
+	}
+
+	if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
+		NCR5380_intr(irq, dummy);
+		handled = 1;
+	}
+
+	return IRQ_RETVAL(handled);
+}
+
+/*
+ * 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;
+
+	if (default_instance) {
+			local_irq_save(flags);
+			NCR5380_print_status(default_instance);
+			local_irq_restore(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);
+
+#ifdef SUN3_SCSI_VME
+	addr = (void *)dvma_map_vme((unsigned long) data, count);
+#else
+	addr = (void *)dvma_map((unsigned long) data, count);
+#endif
+		
+	sun3_dma_orig_addr = addr;
+	sun3_dma_orig_count = count;
+
+#ifndef SUN3_SCSI_VME
+	dregs->fifo_count = 0;
+	sun3_udc_write(UDC_RESET, UDC_CSR);
+	
+	/* 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;
+	
+#ifdef SUN3_SCSI_VME
+	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;
+#else
+	/* byte count for fifo */
+	dregs->fifo_count = count;
+
+	sun3_udc_write(UDC_RESET, UDC_CSR);
+	
+	/* reset fifo */
+	dregs->csr &= ~CSR_FIFO;
+	dregs->csr |= CSR_FIFO;
+	
+	if(dregs->fifo_count != count) { 
+		printk("scsi%d: fifo_mismatch %04x not %04x\n",
+		       default_instance->host_no, dregs->fifo_count,
+		       (unsigned int) count);
+		NCR5380_dprint(NDEBUG_DMA, default_instance);
+	}
+
+	/* setup udc */
+	udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8);
+	udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff);
+	udc_regs->count = count/2; /* count in words */
+	udc_regs->mode_hi = UDC_MODE_HIWORD;
+	if(write_flag) {
+		if(count & 1)
+			udc_regs->count++;
+		udc_regs->mode_lo = UDC_MODE_LSEND;
+		udc_regs->rsel = UDC_RSEL_SEND;
+	} else {
+		udc_regs->mode_lo = UDC_MODE_LRECV;
+		udc_regs->rsel = UDC_RSEL_RECV;
+	}
+	
+	/* announce location of regs block */
+	sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8),
+		       UDC_CHN_HI); 
+
+	sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO);
+
+	/* set dma master on */
+	sun3_udc_write(0xd, UDC_MODE);
+
+	/* interrupt enable */
+	sun3_udc_write(UDC_INT_ENABLE, UDC_CSR);
+#endif
+	
+       	return count;
+
+}
+
+#ifndef SUN3_SCSI_VME
+static inline unsigned long sun3scsi_dma_count(struct Scsi_Host *instance)
+{
+	unsigned short resid;
+
+	dregs->udc_addr = 0x32; 
+	udelay(SUN3_DMA_DELAY);
+	resid = dregs->udc_data;
+	udelay(SUN3_DMA_DELAY);
+	resid *= 2;
+
+	return (unsigned long) resid;
+}
+#endif
+
+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,
+						  struct scsi_cmnd *cmd,
+						  int write_flag)
+{
+	if (cmd->request->cmd_type == REQ_TYPE_FS)
+ 		return wanted;
+	else
+		return 0;
+}
+
+static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data)
+{
+#ifdef SUN3_SCSI_VME
+	unsigned short csr;
+
+	csr = dregs->csr;
+
+	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;
+ */
+#else
+    sun3_udc_write(UDC_CHN_START, UDC_CSR);
+#endif
+    
+    return 0;
+}
+
+/* clean up after our dma is done */
+static int sun3scsi_dma_finish(int write_flag)
+{
+	unsigned short __maybe_unused count;
+	unsigned short fifo;
+	int ret = 0;
+	
+	sun3_dma_active = 0;
+
+#ifdef SUN3_SCSI_VME
+	dregs->csr &= ~CSR_DMA_ENABLE;
+
+	fifo = dregs->fifo_count;
+	if (write_flag) {
+		if ((fifo > 0) && (fifo < sun3_dma_orig_count))
+			fifo++;
+	}
+
+	last_residual = fifo;
+	/* empty bytes from the fifo which didn't make it */
+	if ((!write_flag) && (dregs->csr & CSR_LEFT)) {
+		unsigned char *vaddr;
+
+		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;
+		}
+	}
+#else
+	// check to empty the fifo on a read
+	if(!write_flag) {
+		int tmo = 20000; /* .2 sec */
+		
+		while(1) {
+			if(dregs->csr & CSR_FIFO_EMPTY)
+				break;
+
+			if(--tmo <= 0) {
+				printk("sun3scsi: fifo failed to empty!\n");
+				return 1;
+			}
+			udelay(10);
+		}
+	}
+
+	count = sun3scsi_dma_count(default_instance);
+
+	fifo = dregs->fifo_count;
+	last_residual = fifo;
+
+	/* empty bytes from the fifo which didn't make it */
+	if((!write_flag) && (count - fifo) == 2) {
+		unsigned short data;
+		unsigned char *vaddr;
+
+		data = dregs->fifo_data;
+		vaddr = (unsigned char *)dvma_btov(sun3_dma_orig_addr);
+		
+		vaddr += (sun3_dma_orig_count - fifo);
+
+		vaddr[-2] = (data & 0xff00) >> 8;
+		vaddr[-1] = (data & 0xff);
+	}
+#endif
+
+	dvma_unmap(sun3_dma_orig_addr);
+	sun3_dma_orig_addr = NULL;
+
+#ifdef SUN3_SCSI_VME
+	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; */
+#else
+	sun3_udc_write(UDC_RESET, UDC_CSR);
+	dregs->fifo_count = 0;
+	dregs->csr &= ~CSR_SEND;
+
+	/* reset fifo */
+	dregs->csr &= ~CSR_FIFO;
+	dregs->csr |= CSR_FIFO;
+#endif
+	
+	sun3_dma_setup_done = NULL;
+
+	return ret;
+
+}
+	
+#include "atari_NCR5380.c"
+
+#ifdef SUN3_SCSI_VME
+#define SUN3_SCSI_NAME          "Sun3 NCR5380 VME SCSI"
+#define DRV_MODULE_NAME         "sun3_scsi_vme"
+#else
+#define SUN3_SCSI_NAME          "Sun3 NCR5380 SCSI"
+#define DRV_MODULE_NAME         "sun3_scsi"
+#endif
+
+#define PFX                     DRV_MODULE_NAME ": "
+
+static struct scsi_host_template sun3_scsi_template = {
+	.module			= THIS_MODULE,
+	.proc_name		= DRV_MODULE_NAME,
+	.show_info		= sun3scsi_show_info,
+	.name			= SUN3_SCSI_NAME,
+	.info			= sun3scsi_info,
+	.queuecommand		= sun3scsi_queue_command,
+	.eh_abort_handler      	= sun3scsi_abort,
+	.eh_bus_reset_handler  	= sun3scsi_bus_reset,
+	.can_queue		= 16,
+	.this_id		= 7,
+	.sg_tablesize		= SG_NONE,
+	.cmd_per_lun		= 2,
+	.use_clustering		= DISABLE_CLUSTERING
+};
+
+static int __init sun3_scsi_probe(struct platform_device *pdev)
+{
+	struct Scsi_Host *instance;
+	int error;
+	struct resource *irq, *mem;
+	unsigned char *ioaddr;
+	int host_flags = 0;
+#ifdef SUN3_SCSI_VME
+	int i;
+#endif
+
+	if (setup_can_queue > 0)
+		sun3_scsi_template.can_queue = setup_can_queue;
+	if (setup_cmd_per_lun > 0)
+		sun3_scsi_template.cmd_per_lun = setup_cmd_per_lun;
+	if (setup_sg_tablesize >= 0)
+		sun3_scsi_template.sg_tablesize = setup_sg_tablesize;
+	if (setup_hostid >= 0)
+		sun3_scsi_template.this_id = setup_hostid & 7;
+
+#ifdef SUN3_SCSI_VME
+	ioaddr = NULL;
+	for (i = 0; i < 2; i++) {
+		unsigned char x;
+
+		irq = platform_get_resource(pdev, IORESOURCE_IRQ, i);
+		mem = platform_get_resource(pdev, IORESOURCE_MEM, i);
+		if (!irq || !mem)
+			break;
+
+		ioaddr = sun3_ioremap(mem->start, resource_size(mem),
+		                      SUN3_PAGE_TYPE_VME16);
+		dregs = (struct sun3_dma_regs *)(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(ioaddr);
+		ioaddr = NULL;
+	}
+	if (!ioaddr)
+		return -ENODEV;
+#else
+	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!irq || !mem)
+		return -ENODEV;
+
+	ioaddr = ioremap(mem->start, resource_size(mem));
+	dregs = (struct sun3_dma_regs *)(ioaddr + 8);
+
+	udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs));
+	if (!udc_regs) {
+		pr_err(PFX "couldn't allocate DVMA memory!\n");
+		iounmap(ioaddr);
+		return -ENOMEM;
+	}
+#endif
+
+	sun3_scsi_regp = ioaddr;
+
+	instance = scsi_host_alloc(&sun3_scsi_template,
+	                           sizeof(struct NCR5380_hostdata));
+	if (!instance) {
+		error = -ENOMEM;
+		goto fail_alloc;
+	}
+	default_instance = instance;
+
+	instance->io_port = (unsigned long)ioaddr;
+	instance->irq = irq->start;
+
+#ifdef SUPPORT_TAGS
+	host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0;
+#endif
+
+	NCR5380_init(instance, host_flags);
+
+	error = request_irq(instance->irq, scsi_sun3_intr, 0,
+	                    "NCR5380", instance);
+	if (error) {
+#ifdef REAL_DMA
+		pr_err(PFX "scsi%d: IRQ %d not free, bailing out\n",
+		       instance->host_no, instance->irq);
+		goto fail_irq;
+#else
+		pr_warn(PFX "scsi%d: IRQ %d not free, interrupts disabled\n",
+		        instance->host_no, instance->irq);
+		instance->irq = NO_IRQ;
+#endif
+	}
+
+	dregs->csr = 0;
+	udelay(SUN3_DMA_DELAY);
+	dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
+	udelay(SUN3_DMA_DELAY);
+	dregs->fifo_count = 0;
+#ifdef SUN3_SCSI_VME
+	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);
+#endif
+
+#ifdef RESET_BOOT
+	sun3_scsi_reset_boot(instance);
+#endif
+
+	error = scsi_add_host(instance, NULL);
+	if (error)
+		goto fail_host;
+
+	platform_set_drvdata(pdev, instance);
+
+	scsi_scan_host(instance);
+	return 0;
+
+fail_host:
+	if (instance->irq != NO_IRQ)
+		free_irq(instance->irq, instance);
+fail_irq:
+	NCR5380_exit(instance);
+	scsi_host_put(instance);
+fail_alloc:
+	if (udc_regs)
+		dvma_free(udc_regs);
+	iounmap(sun3_scsi_regp);
+	return error;
+}
+
+static int __exit sun3_scsi_remove(struct platform_device *pdev)
+{
+	struct Scsi_Host *instance = platform_get_drvdata(pdev);
+
+	scsi_remove_host(instance);
+	if (instance->irq != NO_IRQ)
+		free_irq(instance->irq, instance);
+	NCR5380_exit(instance);
+	scsi_host_put(instance);
+	if (udc_regs)
+		dvma_free(udc_regs);
+	iounmap(sun3_scsi_regp);
+	return 0;
+}
+
+static struct platform_driver sun3_scsi_driver = {
+	.remove = __exit_p(sun3_scsi_remove),
+	.driver = {
+		.name	= DRV_MODULE_NAME,
+	},
+};
+
+module_platform_driver_probe(sun3_scsi_driver, sun3_scsi_probe);
+
+MODULE_ALIAS("platform:" DRV_MODULE_NAME);
+MODULE_LICENSE("GPL");