// SPDX-License-Identifier: GPL-2.0-only
/*
 * Detection routine for the NCR53c710 based Amiga SCSI Controllers for Linux.
 *              Amiga Technologies A4000T SCSI controller.
 *
 * Written 1997 by Alan Hourihane <alanh@fairlite.demon.co.uk>
 * plus modifications of the 53c7xx.c driver to support the Amiga.
 *
 * Rewritten to use 53c700.c by Kars de Jong <jongk@linux-m68k.org>
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_spi.h>

#include "53c700.h"


static struct scsi_host_template a4000t_scsi_driver_template = {
        .name           = "A4000T builtin SCSI",
        .proc_name      = "A4000t",
        .this_id        = 7,
        .module         = THIS_MODULE,
};


#define A4000T_SCSI_OFFSET      0x40

static int __init amiga_a4000t_scsi_probe(struct platform_device *pdev)
{
        struct resource *res;
        phys_addr_t scsi_addr;
        struct NCR_700_Host_Parameters *hostdata;
        struct Scsi_Host *host;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res)
                return -ENODEV;

        if (!request_mem_region(res->start, resource_size(res),
                                "A4000T builtin SCSI"))
                return -EBUSY;

        hostdata = kzalloc_obj(struct NCR_700_Host_Parameters);
        if (!hostdata) {
                dev_err(&pdev->dev, "Failed to allocate host data\n");
                goto out_release;
        }

        scsi_addr = res->start + A4000T_SCSI_OFFSET;

        /* Fill in the required pieces of hostdata */
        hostdata->base = ZTWO_VADDR(scsi_addr);
        hostdata->clock = 50;
        hostdata->chip710 = 1;
        hostdata->dmode_extra = DMODE_FC2;
        hostdata->dcntl_extra = EA_710;

        /* and register the chip */
        host = NCR_700_detect(&a4000t_scsi_driver_template, hostdata,
                              &pdev->dev);
        if (!host) {
                dev_err(&pdev->dev,
                        "No host detected; board configuration problem?\n");
                goto out_free;
        }

        host->this_id = 7;
        host->base = scsi_addr;
        host->irq = IRQ_AMIGA_PORTS;

        if (request_irq(host->irq, NCR_700_intr, IRQF_SHARED, "a4000t-scsi",
                        host)) {
                dev_err(&pdev->dev, "request_irq failed\n");
                goto out_put_host;
        }

        platform_set_drvdata(pdev, host);
        scsi_scan_host(host);
        return 0;

 out_put_host:
        scsi_host_put(host);
 out_free:
        kfree(hostdata);
 out_release:
        release_mem_region(res->start, resource_size(res));
        return -ENODEV;
}

static void __exit amiga_a4000t_scsi_remove(struct platform_device *pdev)
{
        struct Scsi_Host *host = platform_get_drvdata(pdev);
        struct NCR_700_Host_Parameters *hostdata = shost_priv(host);
        struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

        scsi_remove_host(host);
        NCR_700_release(host);
        kfree(hostdata);
        free_irq(host->irq, host);
        release_mem_region(res->start, resource_size(res));
}

/*
 * amiga_a4000t_scsi_remove() lives in .exit.text. For drivers registered via
 * module_platform_driver_probe() this is ok because they cannot get unbound at
 * runtime. So mark the driver struct with __refdata to prevent modpost
 * triggering a section mismatch warning.
 */
static struct platform_driver amiga_a4000t_scsi_driver __refdata = {
        .remove = __exit_p(amiga_a4000t_scsi_remove),
        .driver = {
                .name = "amiga-a4000t-scsi",
        },
};

module_platform_driver_probe(amiga_a4000t_scsi_driver, amiga_a4000t_scsi_probe);

MODULE_AUTHOR("Alan Hourihane <alanh@fairlite.demon.co.uk> / "
              "Kars de Jong <jongk@linux-m68k.org>");
MODULE_DESCRIPTION("Amiga A4000T NCR53C710 driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:amiga-a4000t-scsi");