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