drivers/scsi/a4000t.c

// 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(sizeof(struct NCR_700_Host_Parameters),
			   GFP_KERNEL);
	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_new = __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");