a2091.c

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#include <linux/types.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/zorro.h>
#include <linux/module.h>

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>

#include "scsi.h"
#include "wd33c93.h"
#include "a2091.h"


struct a2091_hostdata {
    struct WD33C93_hostdata wh;
    struct a2091_scsiregs *regs;
};

static irqreturn_t a2091_intr(int irq, void *data)
{
    struct Scsi_Host *instance = data;
    struct a2091_hostdata *hdata = shost_priv(instance);
    unsigned int status = hdata->regs->ISTR;
    unsigned long flags;

    if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
        return IRQ_NONE;

    spin_lock_irqsave(instance->host_lock, flags);
    wd33c93_intr(instance);
    spin_unlock_irqrestore(instance->host_lock, flags);
    return IRQ_HANDLED;
}

static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
{
    struct Scsi_Host *instance = cmd->device->host;
    struct a2091_hostdata *hdata = shost_priv(instance);
    struct WD33C93_hostdata *wh = &hdata->wh;
    struct a2091_scsiregs *regs = hdata->regs;
    unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
    unsigned long addr = virt_to_bus(cmd->SCp.ptr);

    /* don't allow DMA if the physical address is bad */
    if (addr & A2091_XFER_MASK) {
        wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
        wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
                        GFP_KERNEL);

        /* can't allocate memory; use PIO */
        if (!wh->dma_bounce_buffer) {
            wh->dma_bounce_len = 0;
            return 1;
        }

        /* get the physical address of the bounce buffer */
        addr = virt_to_bus(wh->dma_bounce_buffer);

        /* the bounce buffer may not be in the first 16M of physmem */
        if (addr & A2091_XFER_MASK) {
            /* we could use chipmem... maybe later */
            kfree(wh->dma_bounce_buffer);
            wh->dma_bounce_buffer = NULL;
            wh->dma_bounce_len = 0;
            return 1;
        }

        if (!dir_in) {
            /* copy to bounce buffer for a write */
            memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
                   cmd->SCp.this_residual);
        }
    }

    /* setup dma direction */
    if (!dir_in)
        cntr |= CNTR_DDIR;

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

    regs->CNTR = cntr;

    /* setup DMA *physical* address */
    regs->ACR = addr;

    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 */
    regs->ST_DMA = 1;

    /* return success */
    return 0;
}

static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
             int status)
{
    struct a2091_hostdata *hdata = shost_priv(instance);
    struct WD33C93_hostdata *wh = &hdata->wh;
    struct a2091_scsiregs *regs = hdata->regs;

    /* disable SCSI interrupts */
    unsigned short cntr = CNTR_PDMD;

    if (!wh->dma_dir)
        cntr |= CNTR_DDIR;

    /* disable SCSI interrupts */
    regs->CNTR = cntr;

    /* flush if we were reading */
    if (wh->dma_dir) {
        regs->FLUSH = 1;
        while (!(regs->ISTR & ISTR_FE_FLG))
            ;
    }

    /* clear a possible interrupt */
    regs->CINT = 1;

    /* stop DMA */
    regs->SP_DMA = 1;

    /* restore the CONTROL bits (minus the direction flag) */
    regs->CNTR = CNTR_PDMD | CNTR_INTEN;

    /* copy from a bounce buffer, if necessary */
    if (status && wh->dma_bounce_buffer) {
        if (wh->dma_dir)
            memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
                   SCpnt->SCp.this_residual);
        kfree(wh->dma_bounce_buffer);
        wh->dma_bounce_buffer = NULL;
        wh->dma_bounce_len = 0;
    }
}

static int a2091_bus_reset(struct scsi_cmnd *cmd)
{
    struct Scsi_Host *instance = cmd->device->host;

    /* FIXME perform bus-specific reset */

    /* FIXME 2: kill this function, and let midlayer fall back
       to the same action, calling wd33c93_host_reset() */

    spin_lock_irq(instance->host_lock);
    wd33c93_host_reset(cmd);
    spin_unlock_irq(instance->host_lock);

    return SUCCESS;
}

static struct scsi_host_template a2091_scsi_template = {
    .module         = THIS_MODULE,
    .name           = "Commodore A2091/A590 SCSI",
    .proc_info      = wd33c93_proc_info,
    .proc_name      = "A2901",
    .queuecommand       = wd33c93_queuecommand,
    .eh_abort_handler   = wd33c93_abort,
    .eh_bus_reset_handler   = a2091_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     = DISABLE_CLUSTERING
};

static int __devinit a2091_probe(struct zorro_dev *z,
                 const struct zorro_device_id *ent)
{
    struct Scsi_Host *instance;
    int error;
    struct a2091_scsiregs *regs;
    wd33c93_regs wdregs;
    struct a2091_hostdata *hdata;

    if (!request_mem_region(z->resource.start, 256, "wd33c93"))
        return -EBUSY;

    instance = scsi_host_alloc(&a2091_scsi_template,
                   sizeof(struct a2091_hostdata));
    if (!instance) {
        error = -ENOMEM;
        goto fail_alloc;
    }

    instance->irq = IRQ_AMIGA_PORTS;
    instance->unique_id = z->slotaddr;

    regs = (struct a2091_scsiregs *)ZTWO_VADDR(z->resource.start);
    regs->DAWR = DAWR_A2091;

    wdregs.SASR = &regs->SASR;
    wdregs.SCMD = &regs->SCMD;

    hdata = shost_priv(instance);
    hdata->wh.no_sync = 0xff;
    hdata->wh.fast = 0;
    hdata->wh.dma_mode = CTRL_DMA;
    hdata->regs = regs;

    wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
    error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
                "A2091 SCSI", instance);
    if (error)
        goto fail_irq;

    regs->CNTR = CNTR_PDMD | CNTR_INTEN;

    error = scsi_add_host(instance, NULL);
    if (error)
        goto fail_host;

    zorro_set_drvdata(z, instance);

    scsi_scan_host(instance);
    return 0;

fail_host:
    free_irq(IRQ_AMIGA_PORTS, instance);
fail_irq:
    scsi_host_put(instance);
fail_alloc:
    release_mem_region(z->resource.start, 256);
    return error;
}

static void __devexit a2091_remove(struct zorro_dev *z)
{
    struct Scsi_Host *instance = zorro_get_drvdata(z);
    struct a2091_hostdata *hdata = shost_priv(instance);

    hdata->regs->CNTR = 0;
    scsi_remove_host(instance);
    free_irq(IRQ_AMIGA_PORTS, instance);
    scsi_host_put(instance);
    release_mem_region(z->resource.start, 256);
}

static struct zorro_device_id a2091_zorro_tbl[] __devinitdata = {
    { ZORRO_PROD_CBM_A590_A2091_1 },
    { ZORRO_PROD_CBM_A590_A2091_2 },
    { 0 }
};
MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);

static struct zorro_driver a2091_driver = {
    .name       = "a2091",
    .id_table   = a2091_zorro_tbl,
    .probe      = a2091_probe,
    .remove     = __devexit_p(a2091_remove),
};

static int __init a2091_init(void)
{
    return zorro_register_driver(&a2091_driver);
}
module_init(a2091_init);

static void __exit a2091_exit(void)
{
    zorro_unregister_driver(&a2091_driver);
}
module_exit(a2091_exit);

MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
MODULE_LICENSE("GPL");