[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 occurred\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: see platform_driver method
 */
static int axon_ram_probe(struct platform_device *device)
{
	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 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 platform_driver_register(&axon_ram_driver);
}

/**
 * axon_ram_exit
 */
static void __exit
axon_ram_exit(void)
{
	platform_driver_unregister(&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
25985edc	98	dev_err(&device->dev, "Correctable memory error occurred\n");
fedcd2c5 MS	99	bank->ecc_counter++;
fedcd2c5 MS	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
00006124	175	* @device: see platform_driver method
dbdf04c4	176	*/
00006124	177	static int axon_ram_probe(struct platform_device *device)
dbdf04c4 MS	178	{
	179	static int axon_ram_bank_id = -1;
	180	struct axon_ram_bank *bank;
	181	struct resource resource;
	182	int rc = 0;
	183
	184	axon_ram_bank_id++;
	185
	186	dev_info(&device->dev, "Found memory controller on %s\n",
61c7a080	187	device->dev.of_node->full_name);
dbdf04c4 MS	188
	189	bank = kzalloc(sizeof(struct axon_ram_bank), GFP_KERNEL);
	190	if (bank == NULL) {
	191	dev_err(&device->dev, "Out of memory\n");
	192	rc = -ENOMEM;
	193	goto failed;
	194	}
	195
	196	device->dev.platform_data = bank;
	197
	198	bank->device = device;
	199
61c7a080	200	if (of_address_to_resource(device->dev.of_node, 0, &resource) != 0) {
dbdf04c4 MS	201	dev_err(&device->dev, "Cannot access device tree\n");
	202	rc = -EFAULT;
	203	goto failed;
	204	}
	205
	206	bank->size = resource.end - resource.start + 1;
	207
	208	if (bank->size == 0) {
	209	dev_err(&device->dev, "No DDR2 memory found for %s%d\n",
	210	AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
	211	rc = -ENODEV;
	212	goto failed;
	213	}
	214
	215	dev_info(&device->dev, "Register DDR2 memory device %s%d with %luMB\n",
	216	AXON_RAM_DEVICE_NAME, axon_ram_bank_id, bank->size >> 20);
	217
	218	bank->ph_addr = resource.start;
	219	bank->io_addr = (unsigned long) ioremap_flags(
	220	bank->ph_addr, bank->size, _PAGE_NO_CACHE);
	221	if (bank->io_addr == 0) {
	222	dev_err(&device->dev, "ioremap() failed\n");
	223	rc = -EFAULT;
	224	goto failed;
	225	}
	226
	227	bank->disk = alloc_disk(AXON_RAM_MINORS_PER_DISK);
	228	if (bank->disk == NULL) {
	229	dev_err(&device->dev, "Cannot register disk\n");
	230	rc = -EFAULT;
	231	goto failed;
	232	}
	233
9a23409b MS	234	bank->disk->major = azfs_major;
9a23409b MS	235	bank->disk->first_minor = azfs_minor;
dbdf04c4 MS	236	bank->disk->fops = &axon_ram_devops;
	237	bank->disk->private_data = bank;
	238	bank->disk->driverfs_dev = &device->dev;
	239
	240	sprintf(bank->disk->disk_name, "%s%d",
	241	AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
dbdf04c4 MS	242
	243	bank->disk->queue = blk_alloc_queue(GFP_KERNEL);
	244	if (bank->disk->queue == NULL) {
	245	dev_err(&device->dev, "Cannot register disk queue\n");
	246	rc = -EFAULT;
	247	goto failed;
	248	}
	249
	250	set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT);
	251	blk_queue_make_request(bank->disk->queue, axon_ram_make_request);
e1defc4f	252	blk_queue_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE);
dbdf04c4 MS	253	add_disk(bank->disk);
dbdf04c4 MS	254
61c7a080	255	bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0);
fedcd2c5	256	if (bank->irq_id == NO_IRQ) {
dbdf04c4 MS	257	dev_err(&device->dev, "Cannot access ECC interrupt ID\n");
	258	rc = -EFAULT;
	259	goto failed;
	260	}
	261
fedcd2c5	262	rc = request_irq(bank->irq_id, axon_ram_irq_handler,
dbdf04c4 MS	263	AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device);
	264	if (rc != 0) {
	265	dev_err(&device->dev, "Cannot register ECC interrupt handler\n");
fedcd2c5	266	bank->irq_id = NO_IRQ;
dbdf04c4 MS	267	rc = -EFAULT;
	268	goto failed;
	269	}
	270
	271	rc = device_create_file(&device->dev, &dev_attr_ecc);
	272	if (rc != 0) {
	273	dev_err(&device->dev, "Cannot create sysfs file\n");
	274	rc = -EFAULT;
	275	goto failed;
	276	}
	277
9a23409b MS	278	azfs_minor += bank->disk->minors;
9a23409b MS	279
dbdf04c4 MS	280	return 0;
	281
	282	failed:
	283	if (bank != NULL) {
fedcd2c5 MS	284	if (bank->irq_id != NO_IRQ)
fedcd2c5 MS	285	free_irq(bank->irq_id, device);
dbdf04c4	286	if (bank->disk != NULL) {
dbdf04c4 MS	287	if (bank->disk->major > 0)
	288	unregister_blkdev(bank->disk->major,
	289	bank->disk->disk_name);
	290	del_gendisk(bank->disk);
	291	}
	292	device->dev.platform_data = NULL;
	293	if (bank->io_addr != 0)
	294	iounmap((void __iomem *) bank->io_addr);
	295	kfree(bank);
	296	}
	297
	298	return rc;
	299	}
	300
	301	/**
	302	* axon_ram_remove - remove() method for platform driver
	303	* @device: see of_platform_driver method
	304	*/
	305	static int
a454dc50	306	axon_ram_remove(struct platform_device *device)
dbdf04c4 MS	307	{
	308	struct axon_ram_bank *bank = device->dev.platform_data;
	309
	310	BUG_ON(!bank \|\| !bank->disk);
	311
	312	device_remove_file(&device->dev, &dev_attr_ecc);
fedcd2c5	313	free_irq(bank->irq_id, device);
dbdf04c4 MS	314	del_gendisk(bank->disk);
	315	iounmap((void __iomem *) bank->io_addr);
	316	kfree(bank);
	317
	318	return 0;
	319	}
	320
	321	static struct of_device_id axon_ram_device_id[] = {
	322	{
	323	.type = "dma-memory"
	324	},
	325	{}
	326	};
	327
00006124	328	static struct platform_driver axon_ram_driver = {
dbdf04c4	329	.probe = axon_ram_probe,
84dd4676	330	.remove = axon_ram_remove,
4018294b GL	331	.driver = {
	332	.name = AXON_RAM_MODULE_NAME,
	333	.owner = THIS_MODULE,
	334	.of_match_table = axon_ram_device_id,
84dd4676	335	},
dbdf04c4 MS	336	};
	337
	338	/**
	339	* axon_ram_init
	340	*/
	341	static int __init
	342	axon_ram_init(void)
	343	{
9a23409b MS	344	azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
	345	if (azfs_major < 0) {
	346	printk(KERN_ERR "%s cannot become block device major number\n",
	347	AXON_RAM_MODULE_NAME);
	348	return -EFAULT;
	349	}
	350	azfs_minor = 0;
	351
00006124	352	return platform_driver_register(&axon_ram_driver);
dbdf04c4 MS	353	}
	354
	355	/**
	356	* axon_ram_exit
	357	*/
	358	static void __exit
	359	axon_ram_exit(void)
	360	{
00006124	361	platform_driver_unregister(&axon_ram_driver);
9a23409b	362	unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
dbdf04c4 MS	363	}
	364
	365	module_init(axon_ram_init);
	366	module_exit(axon_ram_exit);
	367
	368	MODULE_LICENSE("GPL");
	369	MODULE_AUTHOR("Maxim Shchetynin <maxim@de.ibm.com>");
	370	MODULE_DESCRIPTION("Axon DDR2 RAM device driver for IBM Cell BE");