drivers/scsi/mvme147.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/blkdev.h>
   4 #include <linux/interrupt.h>
   5
   6 #include <asm/page.h>
   7 #include <asm/pgtable.h>
   8 #include <asm/mvme147hw.h>
   9 #include <asm/irq.h>
  10
  11 #include "scsi.h"
  12 #include <scsi/scsi_host.h>
  13 #include "wd33c93.h"
  14 #include "mvme147.h"
  15
  16 #include <linux/stat.h>
  17
  18
  19 static irqreturn_t mvme147_intr(int irq, void *data)
  20 {
  21         struct Scsi_Host *instance = data;
  22
  23         if (irq == MVME147_IRQ_SCSI_PORT)
  24                 wd33c93_intr(instance);
  25         else
  26                 m147_pcc->dma_intr = 0x89;      /* Ack and enable ints */
  27         return IRQ_HANDLED;
  28 }
  29
  30 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  31 {
  32         struct Scsi_Host *instance = cmd->device->host;
  33         struct WD33C93_hostdata *hdata = shost_priv(instance);
  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->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
  52         /* start DMA */
  53         m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24);
  54         m147_pcc->dma_dadr = addr;
  55         m147_pcc->dma_cntrl = flags;
  56
  57         /* return success */
  58         return 0;
  59 }
  60
  61 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
  62                      int status)
  63 {
  64         m147_pcc->dma_cntrl = 0;
  65 }
  66
  67 int mvme147_detect(struct scsi_host_template *tpnt)
  68 {
  69         static unsigned char called = 0;
  70         struct Scsi_Host *instance;
  71         wd33c93_regs regs;
  72         struct WD33C93_hostdata *hdata;
  73
  74         if (!MACH_IS_MVME147 || called)
  75                 return 0;
  76         called++;
  77
  78         tpnt->proc_name = "MVME147";
  79         tpnt->show_info = wd33c93_show_info,
  80         tpnt->write_info = wd33c93_write_info,
  81
  82         instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
  83         if (!instance)
  84                 goto err_out;
  85
  86         instance->base = 0xfffe4000;
  87         instance->irq = MVME147_IRQ_SCSI_PORT;
  88         regs.SASR = (volatile unsigned char *)0xfffe4000;
  89         regs.SCMD = (volatile unsigned char *)0xfffe4001;
  90         hdata = shost_priv(instance);
  91         hdata->no_sync = 0xff;
  92         hdata->fast = 0;
  93         hdata->dma_mode = CTRL_DMA;
  94         wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
  95
  96         if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
  97                         "MVME147 SCSI PORT", instance))
  98                 goto err_unregister;
  99         if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
 100                         "MVME147 SCSI DMA", instance))
 101                 goto err_free_irq;
 102 #if 0   /* Disabled; causes problems booting */
 103         m147_pcc->scsi_interrupt = 0x10;        /* Assert SCSI bus reset */
 104         udelay(100);
 105         m147_pcc->scsi_interrupt = 0x00;        /* Negate SCSI bus reset */
 106         udelay(2000);
 107         m147_pcc->scsi_interrupt = 0x40;        /* Clear bus reset interrupt */
 108 #endif
 109         m147_pcc->scsi_interrupt = 0x09;        /* Enable interrupt */
 110
 111         m147_pcc->dma_cntrl = 0x00;     /* ensure DMA is stopped */
 112         m147_pcc->dma_intr = 0x89;      /* Ack and enable ints */
 113
 114         return 1;
 115
 116 err_free_irq:
 117         free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 118 err_unregister:
 119         scsi_unregister(instance);
 120 err_out:
 121         return 0;
 122 }
 123
 124 static int mvme147_bus_reset(struct scsi_cmnd *cmd)
 125 {
 126         /* FIXME perform bus-specific reset */
 127
 128         /* FIXME 2: kill this function, and let midlayer fallback to
 129            the same result, calling wd33c93_host_reset() */
 130
 131         spin_lock_irq(cmd->device->host->host_lock);
 132         wd33c93_host_reset(cmd);
 133         spin_unlock_irq(cmd->device->host->host_lock);
 134
 135         return SUCCESS;
 136 }
 137
 138
 139 static struct scsi_host_template driver_template = {
 140         .proc_name              = "MVME147",
 141         .name                   = "MVME147 built-in SCSI",
 142         .detect                 = mvme147_detect,
 143         .release                = mvme147_release,
 144         .queuecommand           = wd33c93_queuecommand,
 145         .eh_abort_handler       = wd33c93_abort,
 146         .eh_bus_reset_handler   = mvme147_bus_reset,
 147         .eh_host_reset_handler  = wd33c93_host_reset,
 148         .can_queue              = CAN_QUEUE,
 149         .this_id                = 7,
 150         .sg_tablesize           = SG_ALL,
 151         .cmd_per_lun            = CMD_PER_LUN,
 152         .use_clustering         = ENABLE_CLUSTERING
 153 };
 154
 155
 156 #include "scsi_module.c"
 157
 158 int mvme147_release(struct Scsi_Host *instance)
 159 {
 160 #ifdef MODULE
 161         /* XXX Make sure DMA is stopped! */
 162         free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 163         free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
 164 #endif
 165         return 1;
 166 }