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/version.h>
   6 #include <linux/interrupt.h>
   7
   8 #include <asm/page.h>
   9 #include <asm/pgtable.h>
  10 #include <asm/mvme147hw.h>
  11 #include <asm/irq.h>
  12
  13 #include "scsi.h"
  14 #include <scsi/scsi_host.h>
  15 #include "wd33c93.h"
  16 #include "mvme147.h"
  17
  18 #include<linux/stat.h>
  19
  20 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
  21
  22 static struct Scsi_Host *mvme147_host = NULL;
  23
  24 static irqreturn_t mvme147_intr (int irq, void *dummy, struct pt_regs *fp)
  25 {
  26     if (irq == MVME147_IRQ_SCSI_PORT)
  27         wd33c93_intr (mvme147_host);
  28     else
  29         m147_pcc->dma_intr = 0x89;      /* Ack and enable ints */
  30     return IRQ_HANDLED;
  31 }
  32
  33 static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
  34 {
  35     unsigned char flags = 0x01;
  36     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  37
  38     /* setup dma direction */
  39     if (!dir_in)
  40         flags |= 0x04;
  41
  42     /* remember direction */
  43     HDATA(mvme147_host)->dma_dir = dir_in;
  44
  45     if (dir_in)
  46         /* invalidate any cache */
  47         cache_clear (addr, cmd->SCp.this_residual);
  48     else
  49         /* push any dirty cache */
  50         cache_push (addr, cmd->SCp.this_residual);
  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, Scsi_Cmnd *SCpnt,
  62                       int status)
  63 {
  64     m147_pcc->dma_cntrl = 0;
  65 }
  66
  67 int mvme147_detect(Scsi_Host_Template *tpnt)
  68 {
  69     static unsigned char called = 0;
  70     wd33c93_regs regs;
  71
  72     if (!MACH_IS_MVME147 || called)
  73         return 0;
  74     called++;
  75
  76     tpnt->proc_name = "MVME147";
  77     tpnt->proc_info = &wd33c93_proc_info;
  78
  79     mvme147_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
  80     if (!mvme147_host)
  81             goto err_out;
  82
  83     mvme147_host->base = 0xfffe4000;
  84     mvme147_host->irq = MVME147_IRQ_SCSI_PORT;
  85     regs.SASR = (volatile unsigned char *)0xfffe4000;
  86     regs.SCMD = (volatile unsigned char *)0xfffe4001;
  87     wd33c93_init(mvme147_host, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
  88
  89     if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, "MVME147 SCSI PORT", mvme147_intr))
  90             goto err_unregister;
  91     if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, "MVME147 SCSI DMA", mvme147_intr))
  92             goto err_free_irq;
  93 #if 0   /* Disabled; causes problems booting */
  94     m147_pcc->scsi_interrupt = 0x10;    /* Assert SCSI bus reset */
  95     udelay(100);
  96     m147_pcc->scsi_interrupt = 0x00;    /* Negate SCSI bus reset */
  97     udelay(2000);
  98     m147_pcc->scsi_interrupt = 0x40;    /* Clear bus reset interrupt */
  99 #endif
 100     m147_pcc->scsi_interrupt = 0x09;    /* Enable interrupt */
 101
 102     m147_pcc->dma_cntrl = 0x00;         /* ensure DMA is stopped */
 103     m147_pcc->dma_intr = 0x89;          /* Ack and enable ints */
 104
 105     return 1;
 106
 107  err_free_irq:
 108     free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 109  err_unregister:
 110     wd33c93_release();
 111     scsi_unregister(mvme147_host);
 112  err_out:
 113     return 0;
 114 }
 115
 116 static int mvme147_bus_reset(Scsi_Cmnd *cmd)
 117 {
 118         /* FIXME perform bus-specific reset */
 119
 120         /* FIXME 2: kill this function, and let midlayer fallback to
 121            the same result, calling wd33c93_host_reset() */
 122
 123         spin_lock_irq(cmd->device->host->host_lock);
 124         wd33c93_host_reset(cmd);
 125         spin_unlock_irq(cmd->device->host->host_lock);
 126
 127         return SUCCESS;
 128 }
 129
 130 #define HOSTS_C
 131
 132 #include "mvme147.h"
 133
 134 static Scsi_Host_Template driver_template = {
 135         .proc_name              = "MVME147",
 136         .name                   = "MVME147 built-in SCSI",
 137         .detect                 = mvme147_detect,
 138         .release                = mvme147_release,
 139         .queuecommand           = wd33c93_queuecommand,
 140         .eh_abort_handler       = wd33c93_abort,
 141         .eh_bus_reset_handler   = mvme147_bus_reset,
 142         .eh_host_reset_handler  = wd33c93_host_reset,
 143         .can_queue              = CAN_QUEUE,
 144         .this_id                = 7,
 145         .sg_tablesize           = SG_ALL,
 146         .cmd_per_lun            = CMD_PER_LUN,
 147         .use_clustering         = ENABLE_CLUSTERING
 148 };
 149
 150
 151 #include "scsi_module.c"
 152
 153 int mvme147_release(struct Scsi_Host *instance)
 154 {
 155 #ifdef MODULE
 156     /* XXX Make sure DMA is stopped! */
 157     wd33c93_release();
 158     free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 159     free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
 160 #endif
 161     return 1;
 162 }