drivers/scsi/NCR_Q720.c - kernel/mindspeed - Git at Google

 /* -*- mode: c; c-basic-offset: 8 -*- */

 /* NCR Quad 720 MCA SCSI Driver
  *
  * Copyright (C) 2003 by James.Bottomley@HansenPartnership.com
  */

 #include <linux/blkdev.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mca.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <asm/io.h>

 #include "scsi.h"
 #include <scsi/scsi_host.h>

 #include "ncr53c8xx.h"

 #include "NCR_Q720.h"

 static struct ncr_chip q720_chip __initdata = {
 	.revision_id =	0x0f,
 	.burst_max =	3,
 	.offset_max =	8,
 	.nr_divisor =	4,
 	.features =	FE_WIDE | FE_DIFF | FE_VARCLK,
 };

 MODULE_AUTHOR("James Bottomley");
 MODULE_DESCRIPTION("NCR Quad 720 SCSI Driver");
 MODULE_LICENSE("GPL");

 #define NCR_Q720_VERSION		"0.9"

 /* We needs this helper because we have up to four hosts per struct device */
 struct NCR_Q720_private {
 	struct device		*dev;
 	void __iomem *		mem_base;
 	__u32			phys_mem_base;
 	__u32			mem_size;
 	__u8			irq;
 	__u8			siops;
 	__u8			irq_enable;
 	struct Scsi_Host	*hosts[4];
 };

 static struct scsi_host_template NCR_Q720_tpnt = {
 	.module			= THIS_MODULE,
 	.proc_name		= "NCR_Q720",
 };

 static irqreturn_t
 NCR_Q720_intr(int irq, void *data)
 {
 	struct NCR_Q720_private *p = (struct NCR_Q720_private *)data;
 	__u8 sir = (readb(p->mem_base + 0x0d) & 0xf0) >> 4;
 	__u8 siop;

 	sir |= ~p->irq_enable;

 	if(sir == 0xff)
 		return IRQ_NONE;


 	while((siop = ffz(sir)) < p->siops) {
 		sir |= 1<<siop;
 		ncr53c8xx_intr(irq, p->hosts[siop]);
 	}
 	return IRQ_HANDLED;
 }

 static int __init
 NCR_Q720_probe_one(struct NCR_Q720_private *p, int siop,
 		int irq, int slot, __u32 paddr, void __iomem *vaddr)
 {
 	struct ncr_device device;
 	__u8 scsi_id;
 	static int unit = 0;
 	__u8 scsr1 = readb(vaddr + NCR_Q720_SCSR_OFFSET + 1);
 	__u8 differential = readb(vaddr + NCR_Q720_SCSR_OFFSET) & 0x20;
 	__u8 version;
 	int error;

 	scsi_id = scsr1 >> 4;
 	/* enable burst length 16 (FIXME: should allow this) */
 	scsr1 |= 0x02;
 	/* force a siop reset */
 	scsr1 |= 0x04;
 	writeb(scsr1, vaddr + NCR_Q720_SCSR_OFFSET + 1);
 	udelay(10);
 	version = readb(vaddr + 0x18) >> 4;

 	memset(&device, 0, sizeof(struct ncr_device));
 		/* Initialise ncr_device structure with items required by ncr_attach. */
 	device.chip		= q720_chip;
 	device.chip.revision_id	= version;
 	device.host_id		= scsi_id;
 	device.dev		= p->dev;
 	device.slot.base	= paddr;
 	device.slot.base_c	= paddr;
 	device.slot.base_v	= vaddr;
 	device.slot.irq		= irq;
 	device.differential	= differential ? 2 : 0;
 	printk("Q720 probe unit %d (siop%d) at 0x%lx, diff = %d, vers = %d\n", unit, siop,
 	       (unsigned long)paddr, differential, version);

 	p->hosts[siop] = ncr_attach(&NCR_Q720_tpnt, unit++, &device);

 	if (!p->hosts[siop])
 		goto fail;

 	p->irq_enable |= (1<<siop);
 	scsr1 = readb(vaddr + NCR_Q720_SCSR_OFFSET + 1);
 	/* clear the disable interrupt bit */
 	scsr1 &= ~0x01;
 	writeb(scsr1, vaddr + NCR_Q720_SCSR_OFFSET + 1);

 	error = scsi_add_host(p->hosts[siop], p->dev);
 	if (error)
 		ncr53c8xx_release(p->hosts[siop]);
 	else
 		scsi_scan_host(p->hosts[siop]);
 	return error;

  fail:
 	return -ENODEV;
 }

 /* Detect a Q720 card.  Note, because of the setup --- the chips are
  * essentially connectecd to the MCA bus independently, it is easier
  * to set them up as two separate host adapters, rather than one
  * adapter with two channels */
 static int __init
 NCR_Q720_probe(struct device *dev)
 {
 	struct NCR_Q720_private *p;
 	static int banner = 1;
 	struct mca_device *mca_dev = to_mca_device(dev);
 	int slot = mca_dev->slot;
 	int found = 0;
 	int irq, i, siops;
 	__u8 pos2, pos4, asr2, asr9, asr10;
 	__u16 io_base;
 	__u32 base_addr, mem_size;
 	void __iomem *mem_base;

 	p = kzalloc(sizeof(*p), GFP_KERNEL);
 	if (!p)
 		return -ENOMEM;

 	pos2 = mca_device_read_pos(mca_dev, 2);
 	/* enable device */
 	pos2 |=  NCR_Q720_POS2_BOARD_ENABLE | NCR_Q720_POS2_INTERRUPT_ENABLE;
 	mca_device_write_pos(mca_dev, 2, pos2);

 	io_base = (pos2 & NCR_Q720_POS2_IO_MASK) << NCR_Q720_POS2_IO_SHIFT;


 	if(banner) {
 		printk(KERN_NOTICE "NCR Q720: Driver Version " NCR_Q720_VERSION "\n"
 		       "NCR Q720:  Copyright (c) 2003 by James.Bottomley@HansenPartnership.com\n"
 		       "NCR Q720:\n");
 		banner = 0;
 	}
 	io_base = mca_device_transform_ioport(mca_dev, io_base);

 	/* OK, this is phase one of the bootstrap, we now know the
 	 * I/O space base address.  All the configuration registers
 	 * are mapped here (including pos) */

 	/* sanity check I/O mapping */
 	i = inb(io_base) | (inb(io_base+1)<<8);
 	if(i != NCR_Q720_MCA_ID) {
 		printk(KERN_ERR "NCR_Q720, adapter failed to I/O map registers correctly at 0x%x(0x%x)\n", io_base, i);
 		kfree(p);
 		return -ENODEV;
 	}

 	/* Phase II, find the ram base and memory map the board register */
 	pos4 = inb(io_base + 4);
 	/* enable streaming data */
 	pos4 |= 0x01;
 	outb(pos4, io_base + 4);
 	base_addr = (pos4 & 0x7e) << 20;
 	base_addr += (pos4 & 0x80) << 23;
 	asr10 = inb(io_base + 0x12);
 	base_addr += (asr10 & 0x80) << 24;
 	base_addr += (asr10 & 0x70) << 23;

 	/* OK, got the base addr, now we need to find the ram size,
 	 * enable and map it */
 	asr9 = inb(io_base + 0x11);
 	i = (asr9 & 0xc0) >> 6;
 	if(i == 0)
 		mem_size = 1024;
 	else
 		mem_size = 1 << (19 + i);

 	/* enable the sram mapping */
 	asr9 |= 0x20;

 	/* disable the rom mapping */
 	asr9 &= ~0x10;

 	outb(asr9, io_base + 0x11);

 	if(!request_mem_region(base_addr, mem_size, "NCR_Q720")) {
 		printk(KERN_ERR "NCR_Q720: Failed to claim memory region 0x%lx\n-0x%lx",
 		       (unsigned long)base_addr,
 		       (unsigned long)(base_addr + mem_size));
 		goto out_free;
 	}

 	if (dma_declare_coherent_memory(dev, base_addr, base_addr,
 					mem_size, DMA_MEMORY_MAP)
 	    != DMA_MEMORY_MAP) {
 		printk(KERN_ERR "NCR_Q720: DMA declare memory failed\n");
 		goto out_release_region;
 	}

 	/* The first 1k of the memory buffer is a memory map of the registers
 	 */
 	mem_base = dma_mark_declared_memory_occupied(dev, base_addr,
 							    1024);
 	if (IS_ERR(mem_base)) {
 		printk("NCR_Q720 failed to reserve memory mapped region\n");
 		goto out_release;
 	}

 	/* now also enable accesses in asr 2 */
 	asr2 = inb(io_base + 0x0a);

 	asr2 |= 0x01;

 	outb(asr2, io_base + 0x0a);

 	/* get the number of SIOPs (this should be 2 or 4) */
 	siops = ((asr2 & 0xe0) >> 5) + 1;

 	/* sanity check mapping (again) */
 	i = readw(mem_base);
 	if(i != NCR_Q720_MCA_ID) {
 		printk(KERN_ERR "NCR_Q720, adapter failed to memory map registers correctly at 0x%lx(0x%x)\n", (unsigned long)base_addr, i);
 		goto out_release;
 	}

 	irq = readb(mem_base + 5) & 0x0f;


 	/* now do the bus related transforms */
 	irq = mca_device_transform_irq(mca_dev, irq);

 	printk(KERN_NOTICE "NCR Q720: found in slot %d  irq = %d  mem base = 0x%lx siops = %d\n", slot, irq, (unsigned long)base_addr, siops);
 	printk(KERN_NOTICE "NCR Q720: On board ram %dk\n", mem_size/1024);

 	p->dev = dev;
 	p->mem_base = mem_base;
 	p->phys_mem_base = base_addr;
 	p->mem_size = mem_size;
 	p->irq = irq;
 	p->siops = siops;

 	if (request_irq(irq, NCR_Q720_intr, IRQF_SHARED, "NCR_Q720", p)) {
 		printk(KERN_ERR "NCR_Q720: request irq %d failed\n", irq);
 		goto out_release;
 	}
 	/* disable all the siop interrupts */
 	for(i = 0; i < siops; i++) {
 		void __iomem *reg_scsr1 = mem_base + NCR_Q720_CHIP_REGISTER_OFFSET
 			+ i*NCR_Q720_SIOP_SHIFT + NCR_Q720_SCSR_OFFSET + 1;
 		__u8 scsr1 = readb(reg_scsr1);
 		scsr1 |= 0x01;
 		writeb(scsr1, reg_scsr1);
 	}

 	/* plumb in all 720 chips */
 	for (i = 0; i < siops; i++) {
 		void __iomem *siop_v_base = mem_base + NCR_Q720_CHIP_REGISTER_OFFSET
 			+ i*NCR_Q720_SIOP_SHIFT;
 		__u32 siop_p_base = base_addr + NCR_Q720_CHIP_REGISTER_OFFSET
 			+ i*NCR_Q720_SIOP_SHIFT;
 		__u16 port = io_base + NCR_Q720_CHIP_REGISTER_OFFSET
 			+ i*NCR_Q720_SIOP_SHIFT;
 		int err;

 		outb(0xff, port + 0x40);
 		outb(0x07, port + 0x41);
 		if ((err = NCR_Q720_probe_one(p, i, irq, slot,
 					      siop_p_base, siop_v_base)) != 0)
 			printk("Q720: SIOP%d: probe failed, error = %d\n",
 			       i, err);
 		else
 			found++;
 	}

 	if (!found) {
 		kfree(p);
 		return -ENODEV;
 	}

 	mca_device_set_claim(mca_dev, 1);
 	mca_device_set_name(mca_dev, "NCR_Q720");
 	dev_set_drvdata(dev, p);

 	return 0;

  out_release:
 	dma_release_declared_memory(dev);
  out_release_region:
 	release_mem_region(base_addr, mem_size);
  out_free:
 	kfree(p);

 	return -ENODEV;
 }

 static void __exit
 NCR_Q720_remove_one(struct Scsi_Host *host)
 {
 	scsi_remove_host(host);
 	ncr53c8xx_release(host);
 }

 static int __exit
 NCR_Q720_remove(struct device *dev)
 {
 	struct NCR_Q720_private *p = dev_get_drvdata(dev);
 	int i;

 	for (i = 0; i < p->siops; i++)
 		if(p->hosts[i])
 			NCR_Q720_remove_one(p->hosts[i]);

 	dma_release_declared_memory(dev);
 	release_mem_region(p->phys_mem_base, p->mem_size);
 	free_irq(p->irq, p);
 	kfree(p);
 	return 0;
 }

 static short NCR_Q720_id_table[] = { NCR_Q720_MCA_ID, 0 };

 static struct mca_driver NCR_Q720_driver = {
 	.id_table = NCR_Q720_id_table,
 	.driver = {
 		.name		= "NCR_Q720",
 		.bus		= &mca_bus_type,
 		.probe		= NCR_Q720_probe,
 		.remove		= NCR_Q720_remove,
 	},
 };

 static int __init
 NCR_Q720_init(void)
 {
 	int ret = ncr53c8xx_init();
 	if (!ret)
 		ret = mca_register_driver(&NCR_Q720_driver);
 	if (ret)
 		ncr53c8xx_exit();
 	return ret;
 }

 static void __exit
 NCR_Q720_exit(void)
 {
 	mca_unregister_driver(&NCR_Q720_driver);
 	ncr53c8xx_exit();
 }

 module_init(NCR_Q720_init);
 module_exit(NCR_Q720_exit);
	/* -- mode: c; c-basic-offset: 8 -- */

	/* NCR Quad 720 MCA SCSI Driver
	*
	* Copyright (C) 2003 by James.Bottomley@HansenPartnership.com
	*/

	#include <linux/blkdev.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mca.h>
	#include <linux/slab.h>
	#include <linux/types.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <asm/io.h>

	#include "scsi.h"
	#include <scsi/scsi_host.h>

	#include "ncr53c8xx.h"

	#include "NCR_Q720.h"

	static struct ncr_chip q720_chip __initdata = {
	.revision_id = 0x0f,
	.burst_max = 3,
	.offset_max = 8,
	.nr_divisor = 4,
	.features = FE_WIDE \| FE_DIFF \| FE_VARCLK,
	};

	MODULE_AUTHOR("James Bottomley");
	MODULE_DESCRIPTION("NCR Quad 720 SCSI Driver");
	MODULE_LICENSE("GPL");

	#define NCR_Q720_VERSION "0.9"

	/* We needs this helper because we have up to four hosts per struct device */
	struct NCR_Q720_private {
	struct device *dev;
	void __iomem * mem_base;
	__u32 phys_mem_base;
	__u32 mem_size;
	__u8 irq;
	__u8 siops;
	__u8 irq_enable;
	struct Scsi_Host *hosts[4];
	};

	static struct scsi_host_template NCR_Q720_tpnt = {
	.module = THIS_MODULE,
	.proc_name = "NCR_Q720",
	};

	static irqreturn_t
	NCR_Q720_intr(int irq, void *data)
	{
	struct NCR_Q720_private p = (struct NCR_Q720_private )data;
	__u8 sir = (readb(p->mem_base + 0x0d) & 0xf0) >> 4;
	__u8 siop;

	sir \|= ~p->irq_enable;

	if(sir == 0xff)
	return IRQ_NONE;


	while((siop = ffz(sir)) < p->siops) {
	sir \|= 1<<siop;
	ncr53c8xx_intr(irq, p->hosts[siop]);
	}
	return IRQ_HANDLED;
	}

	static int __init
	NCR_Q720_probe_one(struct NCR_Q720_private *p, int siop,
	int irq, int slot, __u32 paddr, void __iomem *vaddr)
	{
	struct ncr_device device;
	__u8 scsi_id;
	static int unit = 0;
	__u8 scsr1 = readb(vaddr + NCR_Q720_SCSR_OFFSET + 1);
	__u8 differential = readb(vaddr + NCR_Q720_SCSR_OFFSET) & 0x20;
	__u8 version;
	int error;

	scsi_id = scsr1 >> 4;
	/* enable burst length 16 (FIXME: should allow this) */
	scsr1 \|= 0x02;
	/* force a siop reset */
	scsr1 \|= 0x04;
	writeb(scsr1, vaddr + NCR_Q720_SCSR_OFFSET + 1);
	udelay(10);
	version = readb(vaddr + 0x18) >> 4;

	memset(&device, 0, sizeof(struct ncr_device));
	/* Initialise ncr_device structure with items required by ncr_attach. */
	device.chip = q720_chip;
	device.chip.revision_id = version;
	device.host_id = scsi_id;
	device.dev = p->dev;
	device.slot.base = paddr;
	device.slot.base_c = paddr;
	device.slot.base_v = vaddr;
	device.slot.irq = irq;
	device.differential = differential ? 2 : 0;
	printk("Q720 probe unit %d (siop%d) at 0x%lx, diff = %d, vers = %d\n", unit, siop,
	(unsigned long)paddr, differential, version);

	p->hosts[siop] = ncr_attach(&NCR_Q720_tpnt, unit++, &device);

	if (!p->hosts[siop])
	goto fail;

	p->irq_enable \|= (1<<siop);
	scsr1 = readb(vaddr + NCR_Q720_SCSR_OFFSET + 1);
	/* clear the disable interrupt bit */
	scsr1 &= ~0x01;
	writeb(scsr1, vaddr + NCR_Q720_SCSR_OFFSET + 1);

	error = scsi_add_host(p->hosts[siop], p->dev);
	if (error)
	ncr53c8xx_release(p->hosts[siop]);
	else
	scsi_scan_host(p->hosts[siop]);
	return error;

	fail:
	return -ENODEV;
	}

	/* Detect a Q720 card. Note, because of the setup --- the chips are
	* essentially connectecd to the MCA bus independently, it is easier
	* to set them up as two separate host adapters, rather than one
	* adapter with two channels */
	static int __init
	NCR_Q720_probe(struct device *dev)
	{
	struct NCR_Q720_private *p;
	static int banner = 1;
	struct mca_device *mca_dev = to_mca_device(dev);
	int slot = mca_dev->slot;
	int found = 0;
	int irq, i, siops;
	__u8 pos2, pos4, asr2, asr9, asr10;
	__u16 io_base;
	__u32 base_addr, mem_size;
	void __iomem *mem_base;

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
	return -ENOMEM;

	pos2 = mca_device_read_pos(mca_dev, 2);
	/* enable device */
	pos2 \|= NCR_Q720_POS2_BOARD_ENABLE \| NCR_Q720_POS2_INTERRUPT_ENABLE;
	mca_device_write_pos(mca_dev, 2, pos2);

	io_base = (pos2 & NCR_Q720_POS2_IO_MASK) << NCR_Q720_POS2_IO_SHIFT;


	if(banner) {
	printk(KERN_NOTICE "NCR Q720: Driver Version " NCR_Q720_VERSION "\n"
	"NCR Q720: Copyright (c) 2003 by James.Bottomley@HansenPartnership.com\n"
	"NCR Q720:\n");
	banner = 0;
	}
	io_base = mca_device_transform_ioport(mca_dev, io_base);

	/* OK, this is phase one of the bootstrap, we now know the
	* I/O space base address. All the configuration registers
	* are mapped here (including pos) */

	/* sanity check I/O mapping */
	i = inb(io_base) \| (inb(io_base+1)<<8);
	if(i != NCR_Q720_MCA_ID) {
	printk(KERN_ERR "NCR_Q720, adapter failed to I/O map registers correctly at 0x%x(0x%x)\n", io_base, i);
	kfree(p);
	return -ENODEV;
	}

	/* Phase II, find the ram base and memory map the board register */
	pos4 = inb(io_base + 4);
	/* enable streaming data */
	pos4 \|= 0x01;
	outb(pos4, io_base + 4);
	base_addr = (pos4 & 0x7e) << 20;
	base_addr += (pos4 & 0x80) << 23;
	asr10 = inb(io_base + 0x12);
	base_addr += (asr10 & 0x80) << 24;
	base_addr += (asr10 & 0x70) << 23;

	/* OK, got the base addr, now we need to find the ram size,
	* enable and map it */
	asr9 = inb(io_base + 0x11);
	i = (asr9 & 0xc0) >> 6;
	if(i == 0)
	mem_size = 1024;
	else
	mem_size = 1 << (19 + i);

	/* enable the sram mapping */
	asr9 \|= 0x20;

	/* disable the rom mapping */
	asr9 &= ~0x10;

	outb(asr9, io_base + 0x11);

	if(!request_mem_region(base_addr, mem_size, "NCR_Q720")) {
	printk(KERN_ERR "NCR_Q720: Failed to claim memory region 0x%lx\n-0x%lx",
	(unsigned long)base_addr,
	(unsigned long)(base_addr + mem_size));
	goto out_free;
	}

	if (dma_declare_coherent_memory(dev, base_addr, base_addr,
	mem_size, DMA_MEMORY_MAP)
	!= DMA_MEMORY_MAP) {
	printk(KERN_ERR "NCR_Q720: DMA declare memory failed\n");
	goto out_release_region;
	}

	/* The first 1k of the memory buffer is a memory map of the registers
	*/
	mem_base = dma_mark_declared_memory_occupied(dev, base_addr,
	1024);
	if (IS_ERR(mem_base)) {
	printk("NCR_Q720 failed to reserve memory mapped region\n");
	goto out_release;
	}

	/* now also enable accesses in asr 2 */
	asr2 = inb(io_base + 0x0a);

	asr2 \|= 0x01;

	outb(asr2, io_base + 0x0a);

	/* get the number of SIOPs (this should be 2 or 4) */
	siops = ((asr2 & 0xe0) >> 5) + 1;

	/* sanity check mapping (again) */
	i = readw(mem_base);
	if(i != NCR_Q720_MCA_ID) {
	printk(KERN_ERR "NCR_Q720, adapter failed to memory map registers correctly at 0x%lx(0x%x)\n", (unsigned long)base_addr, i);
	goto out_release;
	}

	irq = readb(mem_base + 5) & 0x0f;


	/* now do the bus related transforms */
	irq = mca_device_transform_irq(mca_dev, irq);

	printk(KERN_NOTICE "NCR Q720: found in slot %d irq = %d mem base = 0x%lx siops = %d\n", slot, irq, (unsigned long)base_addr, siops);
	printk(KERN_NOTICE "NCR Q720: On board ram %dk\n", mem_size/1024);

	p->dev = dev;
	p->mem_base = mem_base;
	p->phys_mem_base = base_addr;
	p->mem_size = mem_size;
	p->irq = irq;
	p->siops = siops;

	if (request_irq(irq, NCR_Q720_intr, IRQF_SHARED, "NCR_Q720", p)) {
	printk(KERN_ERR "NCR_Q720: request irq %d failed\n", irq);
	goto out_release;
	}
	/* disable all the siop interrupts */
	for(i = 0; i < siops; i++) {
	void __iomem *reg_scsr1 = mem_base + NCR_Q720_CHIP_REGISTER_OFFSET
	+ i*NCR_Q720_SIOP_SHIFT + NCR_Q720_SCSR_OFFSET + 1;
	__u8 scsr1 = readb(reg_scsr1);
	scsr1 \|= 0x01;
	writeb(scsr1, reg_scsr1);
	}

	/* plumb in all 720 chips */
	for (i = 0; i < siops; i++) {
	void __iomem *siop_v_base = mem_base + NCR_Q720_CHIP_REGISTER_OFFSET
	+ i*NCR_Q720_SIOP_SHIFT;
	__u32 siop_p_base = base_addr + NCR_Q720_CHIP_REGISTER_OFFSET
	+ i*NCR_Q720_SIOP_SHIFT;
	__u16 port = io_base + NCR_Q720_CHIP_REGISTER_OFFSET
	+ i*NCR_Q720_SIOP_SHIFT;
	int err;

	outb(0xff, port + 0x40);
	outb(0x07, port + 0x41);
	if ((err = NCR_Q720_probe_one(p, i, irq, slot,
	siop_p_base, siop_v_base)) != 0)
	printk("Q720: SIOP%d: probe failed, error = %d\n",
	i, err);
	else
	found++;
	}

	if (!found) {
	kfree(p);
	return -ENODEV;
	}

	mca_device_set_claim(mca_dev, 1);
	mca_device_set_name(mca_dev, "NCR_Q720");
	dev_set_drvdata(dev, p);

	return 0;

	out_release:
	dma_release_declared_memory(dev);
	out_release_region:
	release_mem_region(base_addr, mem_size);
	out_free:
	kfree(p);

	return -ENODEV;
	}

	static void __exit
	NCR_Q720_remove_one(struct Scsi_Host *host)
	{
	scsi_remove_host(host);
	ncr53c8xx_release(host);
	}

	static int __exit
	NCR_Q720_remove(struct device *dev)
	{
	struct NCR_Q720_private *p = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < p->siops; i++)
	if(p->hosts[i])
	NCR_Q720_remove_one(p->hosts[i]);

	dma_release_declared_memory(dev);
	release_mem_region(p->phys_mem_base, p->mem_size);
	free_irq(p->irq, p);
	kfree(p);
	return 0;
	}

	static short NCR_Q720_id_table[] = { NCR_Q720_MCA_ID, 0 };

	static struct mca_driver NCR_Q720_driver = {
	.id_table = NCR_Q720_id_table,
	.driver = {
	.name = "NCR_Q720",
	.bus = &mca_bus_type,
	.probe = NCR_Q720_probe,
	.remove = NCR_Q720_remove,
	},
	};

	static int __init
	NCR_Q720_init(void)
	{
	int ret = ncr53c8xx_init();
	if (!ret)
	ret = mca_register_driver(&NCR_Q720_driver);
	if (ret)
	ncr53c8xx_exit();
	return ret;
	}

	static void __exit
	NCR_Q720_exit(void)
	{
	mca_unregister_driver(&NCR_Q720_driver);
	ncr53c8xx_exit();
	}

	module_init(NCR_Q720_init);
	module_exit(NCR_Q720_exit);