LXR linux/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
  20static struct Scsi_Host *mvme147_host = NULL;
  21
  22static 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
  31static 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
  59static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
  60                      int status)
  61{
  62    m147_pcc->dma_cntrl = 0;
  63}
  64
  65int 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    HDATA(mvme147_host)->no_sync = 0xff;
  86    HDATA(mvme147_host)->fast = 0;
  87    HDATA(mvme147_host)->dma_mode = CTRL_DMA;
  88    wd33c93_init(mvme147_host, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
  89
  90    if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, "MVME147 SCSI PORT", mvme147_intr))
  91            goto err_unregister;
  92    if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, "MVME147 SCSI DMA", mvme147_intr))
  93            goto err_free_irq;
  94#if 0   /* Disabled; causes problems booting */
  95    m147_pcc->scsi_interrupt = 0x10;    /* Assert SCSI bus reset */
  96    udelay(100);
  97    m147_pcc->scsi_interrupt = 0x00;    /* Negate SCSI bus reset */
  98    udelay(2000);
  99    m147_pcc->scsi_interrupt = 0x40;    /* Clear bus reset interrupt */
 100#endif
 101    m147_pcc->scsi_interrupt = 0x09;    /* Enable interrupt */
 102
 103    m147_pcc->dma_cntrl = 0x00;         /* ensure DMA is stopped */
 104    m147_pcc->dma_intr = 0x89;          /* Ack and enable ints */
 105
 106    return 1;
 107
 108 err_free_irq:
 109    free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 110 err_unregister:
 111    wd33c93_release();
 112    scsi_unregister(mvme147_host);
 113 err_out:
 114    return 0;
 115}
 116
 117static int mvme147_bus_reset(struct scsi_cmnd *cmd)
 118{
 119        /* FIXME perform bus-specific reset */
 120
 121        /* FIXME 2: kill this function, and let midlayer fallback to 
 122           the same result, calling wd33c93_host_reset() */
 123
 124        spin_lock_irq(cmd->device->host->host_lock);
 125        wd33c93_host_reset(cmd);
 126        spin_unlock_irq(cmd->device->host->host_lock);
 127
 128        return SUCCESS;
 129}
 130
 131#define HOSTS_C
 132
 133#include "mvme147.h"
 134
 135static struct scsi_host_template driver_template = {
 136        .proc_name              = "MVME147",
 137        .name                   = "MVME147 built-in SCSI",
 138        .detect                 = mvme147_detect,
 139        .release                = mvme147_release,
 140        .queuecommand           = wd33c93_queuecommand,
 141        .eh_abort_handler       = wd33c93_abort,
 142        .eh_bus_reset_handler   = mvme147_bus_reset,
 143        .eh_host_reset_handler  = wd33c93_host_reset,
 144        .can_queue              = CAN_QUEUE,
 145        .this_id                = 7,
 146        .sg_tablesize           = SG_ALL,
 147        .cmd_per_lun            = CMD_PER_LUN,
 148        .use_clustering         = ENABLE_CLUSTERING
 149};
 150
 151
 152#include "scsi_module.c"
 153
 154int mvme147_release(struct Scsi_Host *instance)
 155{
 156#ifdef MODULE
 157    /* XXX Make sure DMA is stopped! */
 158    wd33c93_release();
 159    free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 160    free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
 161#endif
 162    return 1;
 163}
 164