[mirror_ubuntu-artful-kernel.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/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 <linux/pfn_t.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 blk_qc_t
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;
	struct bvec_iter iter;

	phys_mem = bank->io_addr + (bio->bi_iter.bi_sector <<
				    AXON_RAM_SECTOR_SHIFT);
	phys_end = bank->io_addr + bank->size;
	transfered = 0;
	bio_for_each_segment(vec, bio, iter) {
		if (unlikely(phys_mem + vec.bv_len > phys_end)) {
			bio_io_error(bio);
			return BLK_QC_T_NONE;
		}

		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);
	return BLK_QC_T_NONE;
}

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

	*kaddr = (void *) bank->io_addr + offset;
	*pfn = phys_to_pfn_t(bank->ph_addr + offset, PFN_DEV);
	return bank->size - offset;
}

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_size(&resource);

	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_prot(
			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;

	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);
	device_add_disk(&device->dev, bank->disk);

	bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0);
	if (!bank->irq_id) {
		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 = 0;
		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)
			free_irq(bank->irq_id, device);
		if (bank->disk != NULL) {
			if (bank->disk->major > 0)
				unregister_blkdev(bank->disk->major,
						bank->disk->disk_name);
			if (bank->disk->flags & GENHD_FL_UP)
				del_gendisk(bank->disk);
			put_disk(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);
	put_disk(bank->disk);
	iounmap((void __iomem *) bank->io_addr);
	kfree(bank);

	return 0;
}

static const struct of_device_id axon_ram_device_id[] = {
	{
		.type	= "dma-memory"
	},
	{}
};
MODULE_DEVICE_TABLE(of, axon_ram_device_id);

static struct platform_driver axon_ram_driver = {
	.probe		= axon_ram_probe,
	.remove		= axon_ram_remove,
	.driver = {
		.name = AXON_RAM_MODULE_NAME,
		.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>
dbdf04c4 MS	28	#include <linux/device.h>
	29	#include <linux/errno.h>
	30	#include <linux/fs.h>
	31	#include <linux/genhd.h>
	32	#include <linux/interrupt.h>
	33	#include <linux/io.h>
	34	#include <linux/ioport.h>
	35	#include <linux/irq.h>
	36	#include <linux/irqreturn.h>
	37	#include <linux/kernel.h>
	38	#include <linux/mm.h>
	39	#include <linux/mod_devicetable.h>
	40	#include <linux/module.h>
	41	#include <linux/slab.h>
	42	#include <linux/string.h>
	43	#include <linux/types.h>
eb8f2763 JL	44	#include <linux/of_device.h>
eb8f2763 JL	45	#include <linux/of_platform.h>
34c0fd54	46	#include <linux/pfn_t.h>
eb8f2763	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	*/
dece1635	107	static blk_qc_t
dbdf04c4 MS	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;
7988613b	113	struct bio_vec vec;
dbdf04c4	114	unsigned int transfered;
7988613b	115	struct bvec_iter iter;
dbdf04c4	116
4f024f37 KO	117	phys_mem = bank->io_addr + (bio->bi_iter.bi_sector <<
4f024f37 KO	118	AXON_RAM_SECTOR_SHIFT);
dbdf04c4 MS	119	phys_end = bank->io_addr + bank->size;
dbdf04c4 MS	120	transfered = 0;
7988613b KO	121	bio_for_each_segment(vec, bio, iter) {
7988613b KO	122	if (unlikely(phys_mem + vec.bv_len > phys_end)) {
d81fec0f	123	bio_io_error(bio);
dece1635	124	return BLK_QC_T_NONE;
dbdf04c4 MS	125	}
dbdf04c4 MS	126
7988613b	127	user_mem = page_address(vec.bv_page) + vec.bv_offset;
dbdf04c4	128	if (bio_data_dir(bio) == READ)
7988613b	129	memcpy(user_mem, (void *) phys_mem, vec.bv_len);
dbdf04c4	130	else
7988613b	131	memcpy((void *) phys_mem, user_mem, vec.bv_len);
dbdf04c4	132
7988613b KO	133	phys_mem += vec.bv_len;
7988613b KO	134	transfered += vec.bv_len;
dbdf04c4	135	}
4246a0b6	136	bio_endio(bio);
dece1635	137	return BLK_QC_T_NONE;
dbdf04c4 MS	138	}
	139
	140	/**
	141	* axon_ram_direct_access - direct_access() method for block device
	142	* @device, @sector, @data: see block_device_operations method
	143	*/
dd22f551	144	static long
dbdf04c4	145	axon_ram_direct_access(struct block_device *device, sector_t sector,
7a9eb206	146	void *kaddr, pfn_t pfn, long size)
dbdf04c4 MS	147	{
dbdf04c4 MS	148	struct axon_ram_bank *bank = device->bd_disk->private_data;
dd22f551	149	loff_t offset = (loff_t)sector << AXON_RAM_SECTOR_SHIFT;
dbdf04c4	150
7a9eb206	151	kaddr = (void ) bank->io_addr + offset;
34c0fd54	152	*pfn = phys_to_pfn_t(bank->ph_addr + offset, PFN_DEV);
dd22f551	153	return bank->size - offset;
dbdf04c4 MS	154	}
dbdf04c4 MS	155
83d5cde4	156	static const struct block_device_operations axon_ram_devops = {
dbdf04c4 MS	157	.owner = THIS_MODULE,
	158	.direct_access = axon_ram_direct_access
	159	};
	160
	161	/**
	162	* axon_ram_probe - probe() method for platform driver
00006124	163	* @device: see platform_driver method
dbdf04c4	164	*/
00006124	165	static int axon_ram_probe(struct platform_device *device)
dbdf04c4 MS	166	{
	167	static int axon_ram_bank_id = -1;
	168	struct axon_ram_bank *bank;
	169	struct resource resource;
	170	int rc = 0;
	171
	172	axon_ram_bank_id++;
	173
	174	dev_info(&device->dev, "Found memory controller on %s\n",
61c7a080	175	device->dev.of_node->full_name);
dbdf04c4 MS	176
	177	bank = kzalloc(sizeof(struct axon_ram_bank), GFP_KERNEL);
	178	if (bank == NULL) {
	179	dev_err(&device->dev, "Out of memory\n");
	180	rc = -ENOMEM;
	181	goto failed;
	182	}
	183
	184	device->dev.platform_data = bank;
	185
	186	bank->device = device;
	187
61c7a080	188	if (of_address_to_resource(device->dev.of_node, 0, &resource) != 0) {
dbdf04c4 MS	189	dev_err(&device->dev, "Cannot access device tree\n");
	190	rc = -EFAULT;
	191	goto failed;
	192	}
	193
28f65c11	194	bank->size = resource_size(&resource);
dbdf04c4 MS	195
	196	if (bank->size == 0) {
	197	dev_err(&device->dev, "No DDR2 memory found for %s%d\n",
	198	AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
	199	rc = -ENODEV;
	200	goto failed;
	201	}
	202
	203	dev_info(&device->dev, "Register DDR2 memory device %s%d with %luMB\n",
	204	AXON_RAM_DEVICE_NAME, axon_ram_bank_id, bank->size >> 20);
	205
	206	bank->ph_addr = resource.start;
40f1ce7f	207	bank->io_addr = (unsigned long) ioremap_prot(
dbdf04c4 MS	208	bank->ph_addr, bank->size, _PAGE_NO_CACHE);
	209	if (bank->io_addr == 0) {
	210	dev_err(&device->dev, "ioremap() failed\n");
	211	rc = -EFAULT;
	212	goto failed;
	213	}
	214
	215	bank->disk = alloc_disk(AXON_RAM_MINORS_PER_DISK);
	216	if (bank->disk == NULL) {
	217	dev_err(&device->dev, "Cannot register disk\n");
	218	rc = -EFAULT;
	219	goto failed;
	220	}
	221
9a23409b MS	222	bank->disk->major = azfs_major;
9a23409b MS	223	bank->disk->first_minor = azfs_minor;
dbdf04c4 MS	224	bank->disk->fops = &axon_ram_devops;
dbdf04c4 MS	225	bank->disk->private_data = bank;
dbdf04c4 MS	226
	227	sprintf(bank->disk->disk_name, "%s%d",
	228	AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
dbdf04c4 MS	229
	230	bank->disk->queue = blk_alloc_queue(GFP_KERNEL);
	231	if (bank->disk->queue == NULL) {
	232	dev_err(&device->dev, "Cannot register disk queue\n");
	233	rc = -EFAULT;
	234	goto failed;
	235	}
	236
	237	set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT);
	238	blk_queue_make_request(bank->disk->queue, axon_ram_make_request);
e1defc4f	239	blk_queue_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE);
0d52c756	240	device_add_disk(&device->dev, bank->disk);
dbdf04c4	241
61c7a080	242	bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0);
ef24ba70	243	if (!bank->irq_id) {
dbdf04c4 MS	244	dev_err(&device->dev, "Cannot access ECC interrupt ID\n");
	245	rc = -EFAULT;
	246	goto failed;
	247	}
	248
fedcd2c5	249	rc = request_irq(bank->irq_id, axon_ram_irq_handler,
dbdf04c4 MS	250	AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device);
	251	if (rc != 0) {
	252	dev_err(&device->dev, "Cannot register ECC interrupt handler\n");
ef24ba70	253	bank->irq_id = 0;
dbdf04c4 MS	254	rc = -EFAULT;
	255	goto failed;
	256	}
	257
	258	rc = device_create_file(&device->dev, &dev_attr_ecc);
	259	if (rc != 0) {
	260	dev_err(&device->dev, "Cannot create sysfs file\n");
	261	rc = -EFAULT;
	262	goto failed;
	263	}
	264
9a23409b MS	265	azfs_minor += bank->disk->minors;
9a23409b MS	266
dbdf04c4 MS	267	return 0;
	268
	269	failed:
	270	if (bank != NULL) {
ef24ba70	271	if (bank->irq_id)
fedcd2c5	272	free_irq(bank->irq_id, device);
dbdf04c4	273	if (bank->disk != NULL) {
dbdf04c4 MS	274	if (bank->disk->major > 0)
	275	unregister_blkdev(bank->disk->major,
	276	bank->disk->disk_name);
672a2c87 JK	277	if (bank->disk->flags & GENHD_FL_UP)
	278	del_gendisk(bank->disk);
	279	put_disk(bank->disk);
dbdf04c4 MS	280	}
	281	device->dev.platform_data = NULL;
	282	if (bank->io_addr != 0)
	283	iounmap((void __iomem *) bank->io_addr);
	284	kfree(bank);
	285	}
	286
	287	return rc;
	288	}
	289
	290	/**
	291	* axon_ram_remove - remove() method for platform driver
	292	* @device: see of_platform_driver method
	293	*/
	294	static int
a454dc50	295	axon_ram_remove(struct platform_device *device)
dbdf04c4 MS	296	{
	297	struct axon_ram_bank *bank = device->dev.platform_data;
	298
	299	BUG_ON(!bank \|\| !bank->disk);
	300
	301	device_remove_file(&device->dev, &dev_attr_ecc);
fedcd2c5	302	free_irq(bank->irq_id, device);
dbdf04c4	303	del_gendisk(bank->disk);
672a2c87	304	put_disk(bank->disk);
dbdf04c4 MS	305	iounmap((void __iomem *) bank->io_addr);
	306	kfree(bank);
	307
	308	return 0;
	309	}
	310
ce6d73c9	311	static const struct of_device_id axon_ram_device_id[] = {
dbdf04c4 MS	312	{
	313	.type = "dma-memory"
	314	},
	315	{}
	316	};
b4f81445	317	MODULE_DEVICE_TABLE(of, axon_ram_device_id);
dbdf04c4	318
00006124	319	static struct platform_driver axon_ram_driver = {
dbdf04c4	320	.probe = axon_ram_probe,
84dd4676	321	.remove = axon_ram_remove,
4018294b GL	322	.driver = {
4018294b GL	323	.name = AXON_RAM_MODULE_NAME,
4018294b	324	.of_match_table = axon_ram_device_id,
84dd4676	325	},
dbdf04c4 MS	326	};
	327
	328	/**
	329	* axon_ram_init
	330	*/
	331	static int __init
	332	axon_ram_init(void)
	333	{
9a23409b MS	334	azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
	335	if (azfs_major < 0) {
	336	printk(KERN_ERR "%s cannot become block device major number\n",
	337	AXON_RAM_MODULE_NAME);
	338	return -EFAULT;
	339	}
	340	azfs_minor = 0;
	341
00006124	342	return platform_driver_register(&axon_ram_driver);
dbdf04c4 MS	343	}
	344
	345	/**
	346	* axon_ram_exit
	347	*/
	348	static void __exit
	349	axon_ram_exit(void)
	350	{
00006124	351	platform_driver_unregister(&axon_ram_driver);
9a23409b	352	unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
dbdf04c4 MS	353	}
	354
	355	module_init(axon_ram_init);
	356	module_exit(axon_ram_exit);
	357
	358	MODULE_LICENSE("GPL");
	359	MODULE_AUTHOR("Maxim Shchetynin <maxim@de.ibm.com>");
	360	MODULE_DESCRIPTION("Axon DDR2 RAM device driver for IBM Cell BE");