1 files changed, 642 insertions, 0 deletions

diff --git a/drivers/scsi/sun3_scsi.c b/drivers/scsi/sun3_scsi.c
new file mode 100644
index 000000000000..e3ea99f23d60
--- /dev/null
+++ b/drivers/scsi/sun3_scsi.c
@@ -0,0 +1,642 @@
+/*
+ * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl)
+ *
+ * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net)
+ *
+ * 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
+ *
+ * ALPHA RELEASE 1.
+ *
+ * For more information, please consult
+ *
+ * NCR 5380 Family
+ * SCSI Protocol Controller
+ * Databook
+ *
+ * NCR Microelectronics
+ * 1635 Aeroplaza Drive
+ * Colorado Springs, CO 80916
+ * 1+ (719) 578-3400
+ * 1+ (800) 334-5454
+ */
+
+
+/*
+ * This is from mac_scsi.h, but hey, maybe this is useful for Sun3 too! :)
+ *
+ * Options :
+ *
+ * PARITY - enable parity checking.  Not supported.
+ *
+ * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
+ *
+ * USLEEP - enable support for devices that don't disconnect.  Untested.
+ */
+
+/*
+ * $Log: sun3_NCR5380.c,v $
+ */
+
+#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/blkdev.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>
+
+/* dma on! */
+#define REAL_DMA
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "sun3_scsi.h"
+#include "NCR5380.h"
+
+static void NCR5380_print(struct Scsi_Host *instance);
+
+/* #define OLDDMA */
+
+#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( IRQ_SUN3_SCSI ); 
+
+
+static irqreturn_t 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_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);
+
+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 struct sun3_udc_regs *udc_regs = NULL;
+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;
+}
+
+/* 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);
+}
+
+/*
+ * 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.
+ *
+ */
+ 
+int sun3scsi_detect(Scsi_Host_Template * tpnt)
+{
+        unsigned long ioaddr;
+        static int called = 0;
+        struct Scsi_Host *instance;
+
+        /* check that this machine has an onboard 5380 */
+        switch(idprom->id_machtype) {
+        case SM_SUN3|SM_3_50:
+        case SM_SUN3|SM_3_60:
+                break;
+
+        default:
+                return 0;
+        }
+
+        if(called)
+                return 0;
+
+        tpnt->proc_name = "Sun3 5380 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 = (unsigned long)ioremap(IOBASE_SUN3_SCSI, PAGE_SIZE);
+        sun3_scsi_regp = (unsigned char *)ioaddr;
+
+        dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
+
+        if((udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs)))
+           == NULL) {
+             printk("SUN3 Scsi couldn't allocate DVMA memory!\n");
+             return 0;
+        }
+#ifdef OLDDMA
+        if((dmabuf = dvma_malloc_align(SUN3_DVMA_BUFSIZE, 0x10000)) == NULL) {
+             printk("SUN3 Scsi couldn't allocate DVMA memory!\n");
+             return 0;
+        }
+#endif
+#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_SUN3_SCSI;
+
+        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-5380", NULL)) {
+#ifndef REAL_DMA
+                printk("scsi%d: IRQ%d not free, interrupts disabled\n",
+                       instance->host_no, instance->irq);
+                instance->irq = SCSI_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 at port %lX irq", instance->host_no, instance->io_port);
+        if (instance->irq == SCSI_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;
+
+        called = 1;
+
+#ifdef RESET_BOOT
+        sun3_scsi_reset_boot(instance);
+#endif
+
+        return 1;
+}
+
+int sun3scsi_release (struct Scsi_Host *shpnt)
+{
+        if (shpnt->irq != SCSI_IRQ_NONE)
+                free_irq (shpnt->irq, NULL);
+
+        iounmap((void *)sun3_scsi_regp);
+
+        return 0;
+}
+
+#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
+
+const char * sun3scsi_info (struct Scsi_Host *spnt) {
+    return "";
+}
+
+// safe bits for the CSR
+#define CSR_GOOD 0x060f
+
+static irqreturn_t scsi_sun3_intr(int irq, void *dummy, struct pt_regs *fp)
+{
+        unsigned short csr = dregs->csr;
+        int handled = 0;
+
+        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, fp);
+                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;
+        NCR5380_local_declare();
+
+        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)
+{
+#ifdef OLDDMA
+        if(write_flag) 
+                memcpy(dmabuf, data, count);
+        else {
+                sun3_dma_orig_addr = data;
+                sun3_dma_orig_count = count;
+        }
+#else
+        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((unsigned long) data, count);
+                
+        sun3_dma_orig_addr = addr;
+        sun3_dma_orig_count = count;
+#endif
+        dregs->fifo_count = 0;
+        sun3_udc_write(UDC_RESET, UDC_CSR);
+        
+        /* reset fifo */
+        dregs->csr &= ~CSR_FIFO;
+        dregs->csr |= CSR_FIFO;
+        
+        /* set direction */
+        if(write_flag)
+                dregs->csr |= CSR_SEND;
+        else
+                dregs->csr &= ~CSR_SEND;
+        
+        /* 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_print(default_instance);
+        }
+
+        /* setup udc */
+#ifdef OLDDMA
+        udc_regs->addr_hi = ((dvma_vtob(dmabuf) & 0xff0000) >> 8);
+        udc_regs->addr_lo = (dvma_vtob(dmabuf) & 0xffff);
+#else
+        udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8);
+        udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff);
+#endif
+        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);
+        
+        return count;
+
+}
+
+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;
+}
+
+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->flags & REQ_CMD)
+                return wanted;
+        else
+                return 0;
+}
+
+static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data)
+{
+
+    sun3_udc_write(UDC_CHN_START, UDC_CSR);
+    
+    return 0;
+}
+
+/* clean up after our dma is done */
+static int sun3scsi_dma_finish(int write_flag)
+{
+        unsigned short count;
+        unsigned short fifo;
+        int ret = 0;
+        
+        sun3_dma_active = 0;
+#if 1
+        // 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);
+                }
+        }
+                
+#endif
+
+        count = sun3scsi_dma_count(default_instance);
+#ifdef OLDDMA
+
+        /* if we've finished a read, copy out the data we read */
+        if(sun3_dma_orig_addr) {
+                /* check for residual bytes after dma end */
+                if(count && (NCR5380_read(BUS_AND_STATUS_REG) &
+                             (BASR_PHASE_MATCH | BASR_ACK))) {
+                        printk("scsi%d: sun3_scsi_finish: read overrun baby... ", default_instance->host_no);
+                        printk("basr now %02x\n", NCR5380_read(BUS_AND_STATUS_REG));
+                        ret = count;
+                }
+                
+                /* copy in what we dma'd no matter what */
+                memcpy(sun3_dma_orig_addr, dmabuf, sun3_dma_orig_count);
+                sun3_dma_orig_addr = NULL;
+
+        }
+#else
+
+        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);
+        }
+
+        dvma_unmap(sun3_dma_orig_addr);
+        sun3_dma_orig_addr = NULL;
+#endif
+        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;
+        
+        sun3_dma_setup_done = NULL;
+
+        return ret;
+
+}
+        
+#include "sun3_NCR5380.c"
+
+static Scsi_Host_Template driver_template = {
+        .name                   = SUN3_SCSI_NAME,
+        .detect                 = sun3scsi_detect,
+        .release                = sun3scsi_release,
+        .info                   = sun3scsi_info,
+        .queuecommand           = sun3scsi_queue_command,
+        .eh_abort_handler       = sun3scsi_abort,
+        .eh_bus_reset_handler   = sun3scsi_bus_reset,
+        .can_queue              = CAN_QUEUE,
+        .this_id                = 7,
+        .sg_tablesize           = SG_TABLESIZE,
+        .cmd_per_lun            = CMD_PER_LUN,
+        .use_clustering         = DISABLE_CLUSTERING
+};
+
+
+#include "scsi_module.c"
+
+MODULE_LICENSE("GPL");