drivers/scsi/mvme147.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/blk.h>
   4 #include <linux/sched.h>
   5 #include <linux/version.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 "hosts.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 void 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 }
  30
  31 static int dma_setup (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, Scsi_Cmnd *SCpnt,
  60                       int status)
  61 {
  62     m147_pcc->dma_cntrl = 0;
  63 }
  64
  65 int mvme147_detect(Scsi_Host_Template *tpnt)
  66 {
  67     static unsigned char called = 0;
  68
  69     if (!MACH_IS_MVME147 || called)
  70         return 0;
  71     called++;
  72
  73     tpnt->proc_name = "MVME147";
  74     tpnt->proc_info = &wd33c93_proc_info;
  75
  76     mvme147_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
  77     mvme147_host->base = 0xfffe4000;
  78     mvme147_host->irq = MVME147_IRQ_SCSI_PORT;
  79     wd33c93_init(mvme147_host, (wd33c93_regs *)0xfffe4000,
  80                  dma_setup, dma_stop, WD33C93_FS_8_10);
  81
  82     request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, "MVME147 SCSI PORT", mvme147_intr);
  83     request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, "MVME147 SCSI DMA", mvme147_intr);
  84 #if 0   /* Disabled; causes problems booting */
  85     m147_pcc->scsi_interrupt = 0x10;    /* Assert SCSI bus reset */
  86     udelay(100);
  87     m147_pcc->scsi_interrupt = 0x00;    /* Negate SCSI bus reset */
  88     udelay(2000);
  89     m147_pcc->scsi_interrupt = 0x40;    /* Clear bus reset interrupt */
  90 #endif
  91     m147_pcc->scsi_interrupt = 0x09;    /* Enable interrupt */
  92
  93     m147_pcc->dma_cntrl = 0x00;         /* ensure DMA is stopped */
  94     m147_pcc->dma_intr = 0x89;          /* Ack and enable ints */
  95
  96     return 1;
  97 }
  98
  99 #define HOSTS_C
 100
 101 #include "mvme147.h"
 102
 103 static Scsi_Host_Template driver_template = MVME147_SCSI;
 104
 105 #include "scsi_module.c"
 106
 107 int mvme147_release(struct Scsi_Host *instance)
 108 {
 109 #ifdef MODULE
 110     /* XXX Make sure DMA is stopped! */
 111     wd33c93_release();
 112     free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 113     free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
 114 #endif
 115     return 1;
 116 }