[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / powerpc / sysdev / axonram.c

/*
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2006
 *
 * Author: Maxim Shchetynin <maxim@de.ibm.com>
 *
 * Axon DDR2 device driver.
 * It registers one block device per Axon's DDR2 memory bank found on a system.
 * Block devices are called axonram?, their major and minor numbers are
 * available in /proc/devices, /proc/partitions or in /sys/block/axonram?/dev.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>

#include <asm/page.h>
#include <asm/prom.h>

#define AXON_RAM_MODULE_NAME		"axonram"
#define AXON_RAM_DEVICE_NAME		"axonram"
#define AXON_RAM_MINORS_PER_DISK	16
#define AXON_RAM_BLOCK_SHIFT		PAGE_SHIFT
#define AXON_RAM_BLOCK_SIZE		1 << AXON_RAM_BLOCK_SHIFT
#define AXON_RAM_SECTOR_SHIFT		9
#define AXON_RAM_SECTOR_SIZE		1 << AXON_RAM_SECTOR_SHIFT
#define AXON_RAM_IRQ_FLAGS		IRQF_SHARED | IRQF_TRIGGER_RISING

static int azfs_major, azfs_minor;

struct axon_ram_bank {
	struct platform_device	*device;
	struct gendisk		*disk;
	unsigned int		irq_id;
	unsigned long		ph_addr;
	unsigned long		io_addr;
	unsigned long		size;
	unsigned long		ecc_counter;
};

static ssize_t
axon_ram_sysfs_ecc(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct platform_device *device = to_platform_device(dev);
	struct axon_ram_bank *bank = device->dev.platform_data;

	BUG_ON(!bank);

	return sprintf(buf, "%ld\n", bank->ecc_counter);
}

static DEVICE_ATTR(ecc, S_IRUGO, axon_ram_sysfs_ecc, NULL);

/**
 * axon_ram_irq_handler - interrupt handler for Axon RAM ECC
 * @irq: interrupt ID
 * @dev: pointer to of_device
 */
static irqreturn_t
axon_ram_irq_handler(int irq, void *dev)
{
	struct platform_device *device = dev;
	struct axon_ram_bank *bank = device->dev.platform_data;

	BUG_ON(!bank);

	dev_err(&device->dev, "Correctable memory error occured\n");
	bank->ecc_counter++;
	return IRQ_HANDLED;
}

/**
 * axon_ram_make_request - make_request() method for block device
 * @queue, @bio: see blk_queue_make_request()
 */
static int
axon_ram_make_request(struct request_queue *queue, struct bio *bio)
{
	struct axon_ram_bank *bank = bio->bi_bdev->bd_disk->private_data;
	unsigned long phys_mem, phys_end;
	void *user_mem;
	struct bio_vec *vec;
	unsigned int transfered;
	unsigned short idx;
	int rc = 0;

	phys_mem = bank->io_addr + (bio->bi_sector << AXON_RAM_SECTOR_SHIFT);
	phys_end = bank->io_addr + bank->size;
	transfered = 0;
	bio_for_each_segment(vec, bio, idx) {
		if (unlikely(phys_mem + vec->bv_len > phys_end)) {
			bio_io_error(bio);
			rc = -ERANGE;
			break;
		}

		user_mem = page_address(vec->bv_page) + vec->bv_offset;
		if (bio_data_dir(bio) == READ)
			memcpy(user_mem, (void *) phys_mem, vec->bv_len);
		else
			memcpy((void *) phys_mem, user_mem, vec->bv_len);

		phys_mem += vec->bv_len;
		transfered += vec->bv_len;
	}
	bio_endio(bio, 0);

	return rc;
}

/**
 * axon_ram_direct_access - direct_access() method for block device
 * @device, @sector, @data: see block_device_operations method
 */
static int
axon_ram_direct_access(struct block_device *device, sector_t sector,
		       void **kaddr, unsigned long *pfn)
{
	struct axon_ram_bank *bank = device->bd_disk->private_data;
	loff_t offset;

	offset = sector;
	if (device->bd_part != NULL)
		offset += device->bd_part->start_sect;
	offset <<= AXON_RAM_SECTOR_SHIFT;
	if (offset >= bank->size) {
		dev_err(&bank->device->dev, "Access outside of address space\n");
		return -ERANGE;
	}

	*kaddr = (void *)(bank->ph_addr + offset);
	*pfn = virt_to_phys(kaddr) >> PAGE_SHIFT;

	return 0;
}

static const struct block_device_operations axon_ram_devops = {
	.owner		= THIS_MODULE,
	.direct_access	= axon_ram_direct_access
};

/**
 * axon_ram_probe - probe() method for platform driver
 * @device, @device_id: see of_platform_driver method
 */
static int axon_ram_probe(struct platform_device *device,
			  const struct of_device_id *device_id)
{
	static int axon_ram_bank_id = -1;
	struct axon_ram_bank *bank;
	struct resource resource;
	int rc = 0;

	axon_ram_bank_id++;

	dev_info(&device->dev, "Found memory controller on %s\n",
			device->dev.of_node->full_name);

	bank = kzalloc(sizeof(struct axon_ram_bank), GFP_KERNEL);
	if (bank == NULL) {
		dev_err(&device->dev, "Out of memory\n");
		rc = -ENOMEM;
		goto failed;
	}

	device->dev.platform_data = bank;

	bank->device = device;

	if (of_address_to_resource(device->dev.of_node, 0, &resource) != 0) {
		dev_err(&device->dev, "Cannot access device tree\n");
		rc = -EFAULT;
		goto failed;
	}

	bank->size = resource.end - resource.start + 1;

	if (bank->size == 0) {
		dev_err(&device->dev, "No DDR2 memory found for %s%d\n",
				AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
		rc = -ENODEV;
		goto failed;
	}

	dev_info(&device->dev, "Register DDR2 memory device %s%d with %luMB\n",
			AXON_RAM_DEVICE_NAME, axon_ram_bank_id, bank->size >> 20);

	bank->ph_addr = resource.start;
	bank->io_addr = (unsigned long) ioremap_flags(
			bank->ph_addr, bank->size, _PAGE_NO_CACHE);
	if (bank->io_addr == 0) {
		dev_err(&device->dev, "ioremap() failed\n");
		rc = -EFAULT;
		goto failed;
	}

	bank->disk = alloc_disk(AXON_RAM_MINORS_PER_DISK);
	if (bank->disk == NULL) {
		dev_err(&device->dev, "Cannot register disk\n");
		rc = -EFAULT;
		goto failed;
	}

	bank->disk->major = azfs_major;
	bank->disk->first_minor = azfs_minor;
	bank->disk->fops = &axon_ram_devops;
	bank->disk->private_data = bank;
	bank->disk->driverfs_dev = &device->dev;

	sprintf(bank->disk->disk_name, "%s%d",
			AXON_RAM_DEVICE_NAME, axon_ram_bank_id);

	bank->disk->queue = blk_alloc_queue(GFP_KERNEL);
	if (bank->disk->queue == NULL) {
		dev_err(&device->dev, "Cannot register disk queue\n");
		rc = -EFAULT;
		goto failed;
	}

	set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT);
	blk_queue_make_request(bank->disk->queue, axon_ram_make_request);
	blk_queue_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE);
	add_disk(bank->disk);

	bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0);
	if (bank->irq_id == NO_IRQ) {
		dev_err(&device->dev, "Cannot access ECC interrupt ID\n");
		rc = -EFAULT;
		goto failed;
	}

	rc = request_irq(bank->irq_id, axon_ram_irq_handler,
			AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device);
	if (rc != 0) {
		dev_err(&device->dev, "Cannot register ECC interrupt handler\n");
		bank->irq_id = NO_IRQ;
		rc = -EFAULT;
		goto failed;
	}

	rc = device_create_file(&device->dev, &dev_attr_ecc);
	if (rc != 0) {
		dev_err(&device->dev, "Cannot create sysfs file\n");
		rc = -EFAULT;
		goto failed;
	}

	azfs_minor += bank->disk->minors;

	return 0;

failed:
	if (bank != NULL) {
		if (bank->irq_id != NO_IRQ)
			free_irq(bank->irq_id, device);
		if (bank->disk != NULL) {
			if (bank->disk->major > 0)
				unregister_blkdev(bank->disk->major,
						bank->disk->disk_name);
			del_gendisk(bank->disk);
		}
		device->dev.platform_data = NULL;
		if (bank->io_addr != 0)
			iounmap((void __iomem *) bank->io_addr);
		kfree(bank);
	}

	return rc;
}

/**
 * axon_ram_remove - remove() method for platform driver
 * @device: see of_platform_driver method
 */
static int
axon_ram_remove(struct platform_device *device)
{
	struct axon_ram_bank *bank = device->dev.platform_data;

	BUG_ON(!bank || !bank->disk);

	device_remove_file(&device->dev, &dev_attr_ecc);
	free_irq(bank->irq_id, device);
	del_gendisk(bank->disk);
	iounmap((void __iomem *) bank->io_addr);
	kfree(bank);

	return 0;
}

static struct of_device_id axon_ram_device_id[] = {
	{
		.type	= "dma-memory"
	},
	{}
};

static struct of_platform_driver axon_ram_driver = {
	.probe		= axon_ram_probe,
	.remove		= axon_ram_remove,
	.driver = {
		.name = AXON_RAM_MODULE_NAME,
		.owner = THIS_MODULE,
		.of_match_table = axon_ram_device_id,
	},
};

/**
 * axon_ram_init
 */
static int __init
axon_ram_init(void)
{
	azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
	if (azfs_major < 0) {
		printk(KERN_ERR "%s cannot become block device major number\n",
				AXON_RAM_MODULE_NAME);
		return -EFAULT;
	}
	azfs_minor = 0;

	return of_register_platform_driver(&axon_ram_driver);
}

/**
 * axon_ram_exit
 */
static void __exit
axon_ram_exit(void)
{
	of_unregister_platform_driver(&axon_ram_driver);
	unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
}

module_init(axon_ram_init);
module_exit(axon_ram_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Maxim Shchetynin <maxim@de.ibm.com>");
MODULE_DESCRIPTION("Axon DDR2 RAM device driver for IBM Cell BE");
Commit	Line	Data
dbdf04c4 MS	1	/*
	2	* (C) Copyright IBM Deutschland Entwicklung GmbH 2006
	3	*
	4	* Author: Maxim Shchetynin <maxim@de.ibm.com>
	5	*
	6	* Axon DDR2 device driver.
	7	* It registers one block device per Axon's DDR2 memory bank found on a system.
	8	* Block devices are called axonram?, their major and minor numbers are
	9	* available in /proc/devices, /proc/partitions or in /sys/block/axonram?/dev.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2, or (at your option)
	14	* any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25
	26	#include <linux/bio.h>
	27	#include <linux/blkdev.h>
	28	#include <linux/buffer_head.h>
	29	#include <linux/device.h>
	30	#include <linux/errno.h>
	31	#include <linux/fs.h>
	32	#include <linux/genhd.h>
	33	#include <linux/interrupt.h>
	34	#include <linux/io.h>
	35	#include <linux/ioport.h>
	36	#include <linux/irq.h>
	37	#include <linux/irqreturn.h>
	38	#include <linux/kernel.h>
	39	#include <linux/mm.h>
	40	#include <linux/mod_devicetable.h>
	41	#include <linux/module.h>
	42	#include <linux/slab.h>
	43	#include <linux/string.h>
	44	#include <linux/types.h>
eb8f2763 JL	45	#include <linux/of_device.h>
	46	#include <linux/of_platform.h>
	47
dbdf04c4 MS	48	#include <asm/page.h>
	49	#include <asm/prom.h>
	50
	51	#define AXON_RAM_MODULE_NAME "axonram"
	52	#define AXON_RAM_DEVICE_NAME "axonram"
	53	#define AXON_RAM_MINORS_PER_DISK 16
	54	#define AXON_RAM_BLOCK_SHIFT PAGE_SHIFT
	55	#define AXON_RAM_BLOCK_SIZE 1 << AXON_RAM_BLOCK_SHIFT
	56	#define AXON_RAM_SECTOR_SHIFT 9
	57	#define AXON_RAM_SECTOR_SIZE 1 << AXON_RAM_SECTOR_SHIFT
	58	#define AXON_RAM_IRQ_FLAGS IRQF_SHARED \| IRQF_TRIGGER_RISING
	59
9a23409b MS	60	static int azfs_major, azfs_minor;
9a23409b MS	61
dbdf04c4	62	struct axon_ram_bank {
a454dc50	63	struct platform_device *device;
dbdf04c4	64	struct gendisk *disk;
fedcd2c5	65	unsigned int irq_id;
dbdf04c4 MS	66	unsigned long ph_addr;
	67	unsigned long io_addr;
	68	unsigned long size;
	69	unsigned long ecc_counter;
	70	};
	71
	72	static ssize_t
	73	axon_ram_sysfs_ecc(struct device dev, struct device_attribute attr, char *buf)
	74	{
a454dc50	75	struct platform_device *device = to_platform_device(dev);
dbdf04c4 MS	76	struct axon_ram_bank *bank = device->dev.platform_data;
	77
	78	BUG_ON(!bank);
	79
	80	return sprintf(buf, "%ld\n", bank->ecc_counter);
	81	}
	82
	83	static DEVICE_ATTR(ecc, S_IRUGO, axon_ram_sysfs_ecc, NULL);
	84
	85	/**
	86	* axon_ram_irq_handler - interrupt handler for Axon RAM ECC
	87	* @irq: interrupt ID
	88	* @dev: pointer to of_device
	89	*/
	90	static irqreturn_t
	91	axon_ram_irq_handler(int irq, void *dev)
	92	{
a454dc50	93	struct platform_device *device = dev;
dbdf04c4 MS	94	struct axon_ram_bank *bank = device->dev.platform_data;
	95
	96	BUG_ON(!bank);
	97
fedcd2c5 MS	98	dev_err(&device->dev, "Correctable memory error occured\n");
	99	bank->ecc_counter++;
	100	return IRQ_HANDLED;
dbdf04c4 MS	101	}
	102
	103	/**
	104	* axon_ram_make_request - make_request() method for block device
	105	* @queue, @bio: see blk_queue_make_request()
	106	*/
	107	static int
	108	axon_ram_make_request(struct request_queue queue, struct bio bio)
	109	{
	110	struct axon_ram_bank *bank = bio->bi_bdev->bd_disk->private_data;
	111	unsigned long phys_mem, phys_end;
	112	void *user_mem;
	113	struct bio_vec *vec;
	114	unsigned int transfered;
	115	unsigned short idx;
	116	int rc = 0;
	117
	118	phys_mem = bank->io_addr + (bio->bi_sector << AXON_RAM_SECTOR_SHIFT);
	119	phys_end = bank->io_addr + bank->size;
	120	transfered = 0;
	121	bio_for_each_segment(vec, bio, idx) {
	122	if (unlikely(phys_mem + vec->bv_len > phys_end)) {
d81fec0f	123	bio_io_error(bio);
dbdf04c4 MS	124	rc = -ERANGE;
	125	break;
	126	}
	127
	128	user_mem = page_address(vec->bv_page) + vec->bv_offset;
	129	if (bio_data_dir(bio) == READ)
	130	memcpy(user_mem, (void *) phys_mem, vec->bv_len);
	131	else
	132	memcpy((void *) phys_mem, user_mem, vec->bv_len);
	133
	134	phys_mem += vec->bv_len;
	135	transfered += vec->bv_len;
	136	}
d81fec0f	137	bio_endio(bio, 0);
dbdf04c4 MS	138
	139	return rc;
	140	}
	141
	142	/**
	143	* axon_ram_direct_access - direct_access() method for block device
	144	* @device, @sector, @data: see block_device_operations method
	145	*/
	146	static int
	147	axon_ram_direct_access(struct block_device *device, sector_t sector,
30afcb4b	148	void *kaddr, unsigned long pfn)
dbdf04c4 MS	149	{
	150	struct axon_ram_bank *bank = device->bd_disk->private_data;
	151	loff_t offset;
	152
8204cba7 MS	153	offset = sector;
	154	if (device->bd_part != NULL)
	155	offset += device->bd_part->start_sect;
	156	offset <<= AXON_RAM_SECTOR_SHIFT;
dbdf04c4 MS	157	if (offset >= bank->size) {
	158	dev_err(&bank->device->dev, "Access outside of address space\n");
	159	return -ERANGE;
	160	}
	161
30afcb4b JH	162	kaddr = (void )(bank->ph_addr + offset);
30afcb4b JH	163	*pfn = virt_to_phys(kaddr) >> PAGE_SHIFT;
dbdf04c4 MS	164
	165	return 0;
	166	}
	167
83d5cde4	168	static const struct block_device_operations axon_ram_devops = {
dbdf04c4 MS	169	.owner = THIS_MODULE,
	170	.direct_access = axon_ram_direct_access
	171	};
	172
	173	/**
	174	* axon_ram_probe - probe() method for platform driver
	175	* @device, @device_id: see of_platform_driver method
	176	*/
a454dc50 GL	177	static int axon_ram_probe(struct platform_device *device,
a454dc50 GL	178	const struct of_device_id *device_id)
dbdf04c4 MS	179	{
	180	static int axon_ram_bank_id = -1;
	181	struct axon_ram_bank *bank;
	182	struct resource resource;
	183	int rc = 0;
	184
	185	axon_ram_bank_id++;
	186
	187	dev_info(&device->dev, "Found memory controller on %s\n",
61c7a080	188	device->dev.of_node->full_name);
dbdf04c4 MS	189
	190	bank = kzalloc(sizeof(struct axon_ram_bank), GFP_KERNEL);
	191	if (bank == NULL) {
	192	dev_err(&device->dev, "Out of memory\n");
	193	rc = -ENOMEM;
	194	goto failed;
	195	}
	196
	197	device->dev.platform_data = bank;
	198
	199	bank->device = device;
	200
61c7a080	201	if (of_address_to_resource(device->dev.of_node, 0, &resource) != 0) {
dbdf04c4 MS	202	dev_err(&device->dev, "Cannot access device tree\n");
	203	rc = -EFAULT;
	204	goto failed;
	205	}
	206
	207	bank->size = resource.end - resource.start + 1;
	208
	209	if (bank->size == 0) {
	210	dev_err(&device->dev, "No DDR2 memory found for %s%d\n",
	211	AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
	212	rc = -ENODEV;
	213	goto failed;
	214	}
	215
	216	dev_info(&device->dev, "Register DDR2 memory device %s%d with %luMB\n",
	217	AXON_RAM_DEVICE_NAME, axon_ram_bank_id, bank->size >> 20);
	218
	219	bank->ph_addr = resource.start;
	220	bank->io_addr = (unsigned long) ioremap_flags(
	221	bank->ph_addr, bank->size, _PAGE_NO_CACHE);
	222	if (bank->io_addr == 0) {
	223	dev_err(&device->dev, "ioremap() failed\n");
	224	rc = -EFAULT;
	225	goto failed;
	226	}
	227
	228	bank->disk = alloc_disk(AXON_RAM_MINORS_PER_DISK);
	229	if (bank->disk == NULL) {
	230	dev_err(&device->dev, "Cannot register disk\n");
	231	rc = -EFAULT;
	232	goto failed;
	233	}
	234
9a23409b MS	235	bank->disk->major = azfs_major;
9a23409b MS	236	bank->disk->first_minor = azfs_minor;
dbdf04c4 MS	237	bank->disk->fops = &axon_ram_devops;
	238	bank->disk->private_data = bank;
	239	bank->disk->driverfs_dev = &device->dev;
	240
	241	sprintf(bank->disk->disk_name, "%s%d",
	242	AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
dbdf04c4 MS	243
	244	bank->disk->queue = blk_alloc_queue(GFP_KERNEL);
	245	if (bank->disk->queue == NULL) {
	246	dev_err(&device->dev, "Cannot register disk queue\n");
	247	rc = -EFAULT;
	248	goto failed;
	249	}
	250
	251	set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT);
	252	blk_queue_make_request(bank->disk->queue, axon_ram_make_request);
e1defc4f	253	blk_queue_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE);
dbdf04c4 MS	254	add_disk(bank->disk);
dbdf04c4 MS	255
61c7a080	256	bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0);
fedcd2c5	257	if (bank->irq_id == NO_IRQ) {
dbdf04c4 MS	258	dev_err(&device->dev, "Cannot access ECC interrupt ID\n");
	259	rc = -EFAULT;
	260	goto failed;
	261	}
	262
fedcd2c5	263	rc = request_irq(bank->irq_id, axon_ram_irq_handler,
dbdf04c4 MS	264	AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device);
	265	if (rc != 0) {
	266	dev_err(&device->dev, "Cannot register ECC interrupt handler\n");
fedcd2c5	267	bank->irq_id = NO_IRQ;
dbdf04c4 MS	268	rc = -EFAULT;
	269	goto failed;
	270	}
	271
	272	rc = device_create_file(&device->dev, &dev_attr_ecc);
	273	if (rc != 0) {
	274	dev_err(&device->dev, "Cannot create sysfs file\n");
	275	rc = -EFAULT;
	276	goto failed;
	277	}
	278
9a23409b MS	279	azfs_minor += bank->disk->minors;
9a23409b MS	280
dbdf04c4 MS	281	return 0;
	282
	283	failed:
	284	if (bank != NULL) {
fedcd2c5 MS	285	if (bank->irq_id != NO_IRQ)
fedcd2c5 MS	286	free_irq(bank->irq_id, device);
dbdf04c4	287	if (bank->disk != NULL) {
dbdf04c4 MS	288	if (bank->disk->major > 0)
	289	unregister_blkdev(bank->disk->major,
	290	bank->disk->disk_name);
	291	del_gendisk(bank->disk);
	292	}
	293	device->dev.platform_data = NULL;
	294	if (bank->io_addr != 0)
	295	iounmap((void __iomem *) bank->io_addr);
	296	kfree(bank);
	297	}
	298
	299	return rc;
	300	}
	301
	302	/**
	303	* axon_ram_remove - remove() method for platform driver
	304	* @device: see of_platform_driver method
	305	*/
	306	static int
a454dc50	307	axon_ram_remove(struct platform_device *device)
dbdf04c4 MS	308	{
	309	struct axon_ram_bank *bank = device->dev.platform_data;
	310
	311	BUG_ON(!bank \|\| !bank->disk);
	312
	313	device_remove_file(&device->dev, &dev_attr_ecc);
fedcd2c5	314	free_irq(bank->irq_id, device);
dbdf04c4 MS	315	del_gendisk(bank->disk);
	316	iounmap((void __iomem *) bank->io_addr);
	317	kfree(bank);
	318
	319	return 0;
	320	}
	321
	322	static struct of_device_id axon_ram_device_id[] = {
	323	{
	324	.type = "dma-memory"
	325	},
	326	{}
	327	};
	328
	329	static struct of_platform_driver axon_ram_driver = {
dbdf04c4	330	.probe = axon_ram_probe,
84dd4676	331	.remove = axon_ram_remove,
4018294b GL	332	.driver = {
	333	.name = AXON_RAM_MODULE_NAME,
	334	.owner = THIS_MODULE,
	335	.of_match_table = axon_ram_device_id,
84dd4676	336	},
dbdf04c4 MS	337	};
	338
	339	/**
	340	* axon_ram_init
	341	*/
	342	static int __init
	343	axon_ram_init(void)
	344	{
9a23409b MS	345	azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
	346	if (azfs_major < 0) {
	347	printk(KERN_ERR "%s cannot become block device major number\n",
	348	AXON_RAM_MODULE_NAME);
	349	return -EFAULT;
	350	}
	351	azfs_minor = 0;
	352
dbdf04c4 MS	353	return of_register_platform_driver(&axon_ram_driver);
	354	}
	355
	356	/**
	357	* axon_ram_exit
	358	*/
	359	static void __exit
	360	axon_ram_exit(void)
	361	{
	362	of_unregister_platform_driver(&axon_ram_driver);
9a23409b	363	unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
dbdf04c4 MS	364	}
	365
	366	module_init(axon_ram_init);
	367	module_exit(axon_ram_exit);
	368
	369	MODULE_LICENSE("GPL");
	370	MODULE_AUTHOR("Maxim Shchetynin <maxim@de.ibm.com>");
	371	MODULE_DESCRIPTION("Axon DDR2 RAM device driver for IBM Cell BE");