a4000t.c

linux 内核源代码

/*
 * Detection routine for the NCR53c710 based Amiga SCSI Controllers for Linux.
 *		Amiga Technologies A4000T SCSI controller.
 *
 * Written 1997 by Alan Hourihane <[e-mail]>
 * plus modifications of the 53c7xx.c driver to support the Amiga.
 *
 * Rewritten to use 53c700.c by Kars de Jong <[e-mail]>
 */

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

#include "53c700.h"

MODULE_AUTHOR("Alan Hourihane <[e-mail]> / Kars de Jong <[e-mail]>");
MODULE_DESCRIPTION("Amiga A4000T NCR53C710 driver");
MODULE_LICENSE("GPL");


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

static struct platform_device *a4000t_scsi_device;

#define A4000T_SCSI_ADDR 0xdd0040

static int __devinit a4000t_probe(struct device *dev)
{
	struct Scsi_Host *host;
	struct NCR_700_Host_Parameters *hostdata;

	if (!(MACH_IS_AMIGA && AMIGAHW_PRESENT(A4000_SCSI)))
		goto out;

	if (!request_mem_region(A4000T_SCSI_ADDR, 0x1000,
				"A4000T builtin SCSI"))
		goto out;

	hostdata = kzalloc(sizeof(struct NCR_700_Host_Parameters), GFP_KERNEL);
	if (!hostdata) {
		printk(KERN_ERR "a4000t-scsi: Failed to allocate host data\n");
		goto out_release;
	}

	/* Fill in the required pieces of hostdata */
	hostdata->base = (void __iomem *)ZTWO_VADDR(A4000T_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, dev);
	if (!host) {
		printk(KERN_ERR "a4000t-scsi: No host detected; "
				"board configuration problem?\n");
		goto out_free;
	}

	host->this_id = 7;
	host->base = A4000T_SCSI_ADDR;
	host->irq = IRQ_AMIGA_PORTS;

	if (request_irq(host->irq, NCR_700_intr, IRQF_SHARED, "a4000t-scsi",
			host)) {
		printk(KERN_ERR "a4000t-scsi: request_irq failed\n");
		goto out_put_host;
	}

	dev_set_drvdata(dev, host);
	scsi_scan_host(host);

	return 0;

 out_put_host:
	scsi_host_put(host);
 out_free:
	kfree(hostdata);
 out_release:
	release_mem_region(A4000T_SCSI_ADDR, 0x1000);
 out:
	return -ENODEV;
}

static __devexit int a4000t_device_remove(struct device *dev)
{
	struct Scsi_Host *host = dev_get_drvdata(dev);
	struct NCR_700_Host_Parameters *hostdata = shost_priv(host);

	scsi_remove_host(host);

	NCR_700_release(host);
	kfree(hostdata);
	free_irq(host->irq, host);
	release_mem_region(A4000T_SCSI_ADDR, 0x1000);

	return 0;
}

static struct device_driver a4000t_scsi_driver = {
	.name	= "a4000t-scsi",
	.bus	= &platform_bus_type,
	.probe	= a4000t_probe,
	.remove	= __devexit_p(a4000t_device_remove),
};

static int __init a4000t_scsi_init(void)
{
	int err;

	err = driver_register(&a4000t_scsi_driver);
	if (err)
		return err;

	a4000t_scsi_device = platform_device_register_simple("a4000t-scsi",
			-1, NULL, 0);
	if (IS_ERR(a4000t_scsi_device)) {
		driver_unregister(&a4000t_scsi_driver);
		return PTR_ERR(a4000t_scsi_device);
	}

	return err;
}

static void __exit a4000t_scsi_exit(void)
{
	platform_device_unregister(a4000t_scsi_device);
	driver_unregister(&a4000t_scsi_driver);
}

module_init(a4000t_scsi_init);
module_exit(a4000t_scsi_exit);