mvme147.c

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#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/mvme147hw.h>
#include <asm/irq.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "wd33c93.h"
#include "mvme147.h"

#include <linux/stat.h>


static irqreturn_t mvme147_intr(int irq, void *data)
{
    struct Scsi_Host *instance = data;

    if (irq == MVME147_IRQ_SCSI_PORT)
        wd33c93_intr(instance);
    else
        m147_pcc->dma_intr = 0x89;  /* Ack and enable ints */
    return IRQ_HANDLED;
}

static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
{
    struct Scsi_Host *instance = cmd->device->host;
    struct WD33C93_hostdata *hdata = shost_priv(instance);
    unsigned char flags = 0x01;
    unsigned long addr = virt_to_bus(cmd->SCp.ptr);

    /* setup dma direction */
    if (!dir_in)
        flags |= 0x04;

    /* remember direction */
    hdata->dma_dir = dir_in;

    if (dir_in) {
        /* invalidate any cache */
        cache_clear(addr, cmd->SCp.this_residual);
    } else {
        /* push any dirty cache */
        cache_push(addr, cmd->SCp.this_residual);
    }

    /* start DMA */
    m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24);
    m147_pcc->dma_dadr = addr;
    m147_pcc->dma_cntrl = flags;

    /* return success */
    return 0;
}

static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
             int status)
{
    m147_pcc->dma_cntrl = 0;
}

int mvme147_detect(struct scsi_host_template *tpnt)
{
    static unsigned char called = 0;
    struct Scsi_Host *instance;
    wd33c93_regs regs;
    struct WD33C93_hostdata *hdata;

    if (!MACH_IS_MVME147 || called)
        return 0;
    called++;

    tpnt->proc_name = "MVME147";
    tpnt->proc_info = &wd33c93_proc_info;

    instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
    if (!instance)
        goto err_out;

    instance->base = 0xfffe4000;
    instance->irq = MVME147_IRQ_SCSI_PORT;
    regs.SASR = (volatile unsigned char *)0xfffe4000;
    regs.SCMD = (volatile unsigned char *)0xfffe4001;
    hdata = shost_priv(instance);
    hdata->no_sync = 0xff;
    hdata->fast = 0;
    hdata->dma_mode = CTRL_DMA;
    wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);

    if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
            "MVME147 SCSI PORT", instance))
        goto err_unregister;
    if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
            "MVME147 SCSI DMA", instance))
        goto err_free_irq;
#if 0   /* Disabled; causes problems booting */
    m147_pcc->scsi_interrupt = 0x10;    /* Assert SCSI bus reset */
    udelay(100);
    m147_pcc->scsi_interrupt = 0x00;    /* Negate SCSI bus reset */
    udelay(2000);
    m147_pcc->scsi_interrupt = 0x40;    /* Clear bus reset interrupt */
#endif
    m147_pcc->scsi_interrupt = 0x09;    /* Enable interrupt */

    m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */
    m147_pcc->dma_intr = 0x89;  /* Ack and enable ints */

    return 1;

err_free_irq:
    free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
err_unregister:
    scsi_unregister(instance);
err_out:
    return 0;
}

static int mvme147_bus_reset(struct scsi_cmnd *cmd)
{
    /* FIXME perform bus-specific reset */

    /* FIXME 2: kill this function, and let midlayer fallback to
       the same result, calling wd33c93_host_reset() */

    spin_lock_irq(cmd->device->host->host_lock);
    wd33c93_host_reset(cmd);
    spin_unlock_irq(cmd->device->host->host_lock);

    return SUCCESS;
}


static struct scsi_host_template driver_template = {
    .proc_name      = "MVME147",
    .name           = "MVME147 built-in SCSI",
    .detect         = mvme147_detect,
    .release        = mvme147_release,
    .queuecommand       = wd33c93_queuecommand,
    .eh_abort_handler   = wd33c93_abort,
    .eh_bus_reset_handler   = mvme147_bus_reset,
    .eh_host_reset_handler  = wd33c93_host_reset,
    .can_queue      = CAN_QUEUE,
    .this_id        = 7,
    .sg_tablesize       = SG_ALL,
    .cmd_per_lun        = CMD_PER_LUN,
    .use_clustering     = ENABLE_CLUSTERING
};


#include "scsi_module.c"

int mvme147_release(struct Scsi_Host *instance)
{
#ifdef MODULE
    /* XXX Make sure DMA is stopped! */
    free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
    free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
#endif
    return 1;
}