// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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 <jongk@linux-m68k.org>
 */

#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 <jongk@linux-m68k.org>");
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 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_obj(struct NCR_700_Host_Parameters);
        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 void 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);
}

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