mvme16x_scsi.c

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/*
 * Detection routine for the NCR53c710 based MVME16x SCSI Controllers for Linux.
 *
 * Based on work by Alan Hourihane
 *
 * Rewritten to use 53c700.c by Kars de Jong <[email protected]>
 */

#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <asm/mvme16xhw.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_spi.h>

#include "53c700.h"

MODULE_AUTHOR("Kars de Jong <[email protected]>");
MODULE_DESCRIPTION("MVME16x NCR53C710 driver");
MODULE_LICENSE("GPL");

static struct scsi_host_template mvme16x_scsi_driver_template = {
    .name           = "MVME16x NCR53c710 SCSI",
    .proc_name      = "MVME16x",
    .this_id        = 7,
    .module         = THIS_MODULE,
};

static struct platform_device *mvme16x_scsi_device;

static __devinit int
mvme16x_probe(struct platform_device *dev)
{
    struct Scsi_Host * host = NULL;
    struct NCR_700_Host_Parameters *hostdata;

    if (!MACH_IS_MVME16x)
        goto out;

    if (mvme16x_config & MVME16x_CONFIG_NO_SCSICHIP) {
        printk(KERN_INFO "mvme16x-scsi: detection disabled, "
                 "SCSI chip not present\n");
        goto out;
    }

    hostdata = kzalloc(sizeof(struct NCR_700_Host_Parameters), GFP_KERNEL);
    if (hostdata == NULL) {
        printk(KERN_ERR "mvme16x-scsi: "
                "Failed to allocate host data\n");
        goto out;
    }

    /* Fill in the required pieces of hostdata */
    hostdata->base = (void __iomem *)0xfff47000UL;
    hostdata->clock = 50;   /* XXX - depends on the CPU clock! */
    hostdata->chip710 = 1;
    hostdata->dmode_extra = DMODE_FC2;
    hostdata->dcntl_extra = EA_710;
    hostdata->ctest7_extra = CTEST7_TT1;

    /* and register the chip */
    host = NCR_700_detect(&mvme16x_scsi_driver_template, hostdata,
                  &dev->dev);
    if (!host) {
        printk(KERN_ERR "mvme16x-scsi: No host detected; "
                "board configuration problem?\n");
        goto out_free;
    }
    host->this_id = 7;
    host->base = 0xfff47000UL;
    host->irq = MVME16x_IRQ_SCSI;
    if (request_irq(host->irq, NCR_700_intr, 0, "mvme16x-scsi", host)) {
        printk(KERN_ERR "mvme16x-scsi: request_irq failed\n");
        goto out_put_host;
    }

    /* Enable scsi chip ints */
    {
        volatile unsigned long v;

        /* Enable scsi interrupts at level 4 in PCCchip2 */
        v = in_be32(0xfff4202c);
        v = (v & ~0xff) | 0x10 | 4;
        out_be32(0xfff4202c, v);
    }

    platform_set_drvdata(dev, host);
    scsi_scan_host(host);

    return 0;

 out_put_host:
    scsi_host_put(host);
 out_free:
    kfree(hostdata);
 out:
    return -ENODEV;
}

static __devexit int
mvme16x_device_remove(struct platform_device *dev)
{
    struct Scsi_Host *host = platform_get_drvdata(dev);
    struct NCR_700_Host_Parameters *hostdata = shost_priv(host);

    /* Disable scsi chip ints */
    {
        volatile unsigned long v;

        v = in_be32(0xfff4202c);
        v &= ~0x10;
        out_be32(0xfff4202c, v);
    }
    scsi_remove_host(host);
    NCR_700_release(host);
    kfree(hostdata);
    free_irq(host->irq, host);

    return 0;
}

static struct platform_driver mvme16x_scsi_driver = {
    .driver = {
        .name           = "mvme16x-scsi",
        .owner          = THIS_MODULE,
    },
    .probe          = mvme16x_probe,
    .remove         = __devexit_p(mvme16x_device_remove),
};

static int __init mvme16x_scsi_init(void)
{
    int err;

    err = platform_driver_register(&mvme16x_scsi_driver);
    if (err)
        return err;

    mvme16x_scsi_device = platform_device_register_simple("mvme16x-scsi",
                                  -1, NULL, 0);
    if (IS_ERR(mvme16x_scsi_device)) {
        platform_driver_unregister(&mvme16x_scsi_driver);
        return PTR_ERR(mvme16x_scsi_device);
    }

    return 0;
}

static void __exit mvme16x_scsi_exit(void)
{
    platform_device_unregister(mvme16x_scsi_device);
    platform_driver_unregister(&mvme16x_scsi_driver);
}

module_init(mvme16x_scsi_init);
module_exit(mvme16x_scsi_exit);