drivers/scsi/mvme147.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/blkdev.h>
   4 #include <linux/sched.h>
   5 #include <linux/interrupt.h>
   6
   7 #include <asm/page.h>
   8 #include <asm/pgtable.h>
   9 #include <asm/mvme147hw.h>
  10 #include <asm/irq.h>
  11
  12 #include "scsi.h"
  13 #include <scsi/scsi_host.h>
  14 #include "wd33c93.h"
  15 #include "mvme147.h"
  16
  17 #include<linux/stat.h>
  18
  19 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
  20
  21 static struct Scsi_Host *mvme147_host = NULL;
  22
  23 static irqreturn_t mvme147_intr (int irq, void *dummy, struct pt_regs *fp)
  24 {
  25     if (irq == MVME147_IRQ_SCSI_PORT)
  26         wd33c93_intr (mvme147_host);
  27     else
  28         m147_pcc->dma_intr = 0x89;      /* Ack and enable ints */
  29     return IRQ_HANDLED;
  30 }
  31
  32 static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
  33 {
  34     unsigned char flags = 0x01;
  35     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  36
  37     /* setup dma direction */
  38     if (!dir_in)
  39         flags |= 0x04;
  40
  41     /* remember direction */
  42     HDATA(mvme147_host)->dma_dir = dir_in;
  43
  44     if (dir_in)
  45         /* invalidate any cache */
  46         cache_clear (addr, cmd->SCp.this_residual);
  47     else
  48         /* push any dirty cache */
  49         cache_push (addr, cmd->SCp.this_residual);
  50
  51     /* start DMA */
  52     m147_pcc->dma_bcr   = cmd->SCp.this_residual | (1<<24);
  53     m147_pcc->dma_dadr  = addr;
  54     m147_pcc->dma_cntrl = flags;
  55
  56     /* return success */
  57     return 0;
  58 }
  59
  60 static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
  61                       int status)
  62 {
  63     m147_pcc->dma_cntrl = 0;
  64 }
  65
  66 int mvme147_detect(struct scsi_host_template *tpnt)
  67 {
  68     static unsigned char called = 0;
  69     wd33c93_regs regs;
  70
  71     if (!MACH_IS_MVME147 || called)
  72         return 0;
  73     called++;
  74
  75     tpnt->proc_name = "MVME147";
  76     tpnt->proc_info = &wd33c93_proc_info;
  77
  78     mvme147_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
  79     if (!mvme147_host)
  80             goto err_out;
  81
  82     mvme147_host->base = 0xfffe4000;
  83     mvme147_host->irq = MVME147_IRQ_SCSI_PORT;
  84     regs.SASR = (volatile unsigned char *)0xfffe4000;
  85     regs.SCMD = (volatile unsigned char *)0xfffe4001;
  86     wd33c93_init(mvme147_host, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
  87
  88     if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, "MVME147 SCSI PORT", mvme147_intr))
  89             goto err_unregister;
  90     if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, "MVME147 SCSI DMA", mvme147_intr))
  91             goto err_free_irq;
  92 #if 0   /* Disabled; causes problems booting */
  93     m147_pcc->scsi_interrupt = 0x10;    /* Assert SCSI bus reset */
  94     udelay(100);
  95     m147_pcc->scsi_interrupt = 0x00;    /* Negate SCSI bus reset */
  96     udelay(2000);
  97     m147_pcc->scsi_interrupt = 0x40;    /* Clear bus reset interrupt */
  98 #endif
  99     m147_pcc->scsi_interrupt = 0x09;    /* Enable interrupt */
 100
 101     m147_pcc->dma_cntrl = 0x00;         /* ensure DMA is stopped */
 102     m147_pcc->dma_intr = 0x89;          /* Ack and enable ints */
 103
 104     return 1;
 105
 106  err_free_irq:
 107     free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 108  err_unregister:
 109     wd33c93_release();
 110     scsi_unregister(mvme147_host);
 111  err_out:
 112     return 0;
 113 }
 114
 115 static int mvme147_bus_reset(Scsi_Cmnd *cmd)
 116 {
 117         /* FIXME perform bus-specific reset */
 118
 119         /* FIXME 2: kill this function, and let midlayer fallback to
 120            the same result, calling wd33c93_host_reset() */
 121
 122         spin_lock_irq(cmd->device->host->host_lock);
 123         wd33c93_host_reset(cmd);
 124         spin_unlock_irq(cmd->device->host->host_lock);
 125
 126         return SUCCESS;
 127 }
 128
 129 #define HOSTS_C
 130
 131 #include "mvme147.h"
 132
 133 static struct scsi_host_template driver_template = {
 134         .proc_name              = "MVME147",
 135         .name                   = "MVME147 built-in SCSI",
 136         .detect                 = mvme147_detect,
 137         .release                = mvme147_release,
 138         .queuecommand           = wd33c93_queuecommand,
 139         .eh_abort_handler       = wd33c93_abort,
 140         .eh_bus_reset_handler   = mvme147_bus_reset,
 141         .eh_host_reset_handler  = wd33c93_host_reset,
 142         .can_queue              = CAN_QUEUE,
 143         .this_id                = 7,
 144         .sg_tablesize           = SG_ALL,
 145         .cmd_per_lun            = CMD_PER_LUN,
 146         .use_clustering         = ENABLE_CLUSTERING
 147 };
 148
 149
 150 #include "scsi_module.c"
 151
 152 int mvme147_release(struct Scsi_Host *instance)
 153 {
 154 #ifdef MODULE
 155     /* XXX Make sure DMA is stopped! */
 156     wd33c93_release();
 157     free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 158     free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
 159 #endif
 160     return 1;
 161 }