[mirror_ubuntu-artful-kernel.git] / drivers / mtd / maps / ixp4xx.c

/*
 * $Id: ixp4xx.c,v 1.8 2005/09/08 10:32:20 dvrabel Exp $
 *
 * drivers/mtd/maps/ixp4xx.c
 *
 * MTD Map file for IXP4XX based systems. Please do not make per-board
 * changes in here. If your board needs special setup, do it in your
 * platform level code in arch/arm/mach-ixp4xx/board-setup.c
 *
 * Original Author: Intel Corporation
 * Maintainer: Deepak Saxena <dsaxena@mvista.com>
 *
 * Copyright (C) 2002 Intel Corporation
 * Copyright (C) 2003-2004 MontaVista Software, Inc.
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/platform_device.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#include <asm/io.h>
#include <asm/mach/flash.h>

#include <linux/reboot.h>

#ifndef __ARMEB__
#define	BYTE0(h)	((h) & 0xFF)
#define	BYTE1(h)	(((h) >> 8) & 0xFF)
#else
#define	BYTE0(h)	(((h) >> 8) & 0xFF)
#define	BYTE1(h)	((h) & 0xFF)
#endif

static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
{
	map_word val;
	val.x[0] = *(__u16 *) (map->map_priv_1 + ofs);
	return val;
}

/*
 * The IXP4xx expansion bus only allows 16-bit wide acceses
 * when attached to a 16-bit wide device (such as the 28F128J3A),
 * so we can't just memcpy_fromio().
 */
static void ixp4xx_copy_from(struct map_info *map, void *to,
			     unsigned long from, ssize_t len)
{
	int i;
	u8 *dest = (u8 *) to;
	u16 *src = (u16 *) (map->map_priv_1 + from);
	u16 data;

	for (i = 0; i < (len / 2); i++) {
		data = src[i];
		dest[i * 2] = BYTE0(data);
		dest[i * 2 + 1] = BYTE1(data);
	}

	if (len & 1)
		dest[len - 1] = BYTE0(src[i]);
}

/* 
 * Unaligned writes are ignored, causing the 8-bit
 * probe to fail and proceed to the 16-bit probe (which succeeds).
 */
static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
{
	if (!(adr & 1))
	       *(__u16 *) (map->map_priv_1 + adr) = d.x[0];
}

/* 
 * Fast write16 function without the probing check above
 */
static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
{
       *(__u16 *) (map->map_priv_1 + adr) = d.x[0];
}

struct ixp4xx_flash_info {
	struct mtd_info *mtd;
	struct map_info map;
	struct mtd_partition *partitions;
	struct resource *res;
};

static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };

static int ixp4xx_flash_remove(struct device *_dev)
{
	struct platform_device *dev = to_platform_device(_dev);
	struct flash_platform_data *plat = dev->dev.platform_data;
	struct ixp4xx_flash_info *info = dev_get_drvdata(&dev->dev);
	map_word d;

	dev_set_drvdata(&dev->dev, NULL);

	if(!info)
		return 0;

	if (info->mtd) {
		del_mtd_partitions(info->mtd);
		map_destroy(info->mtd);
	}
	if (info->map.map_priv_1)
		iounmap((void *) info->map.map_priv_1);

	if (info->partitions)
		kfree(info->partitions);

	if (info->res) {
		release_resource(info->res);
		kfree(info->res);
	}

	if (plat->exit)
		plat->exit();

	return 0;
}

static int ixp4xx_flash_probe(struct device *_dev)
{
	struct platform_device *dev = to_platform_device(_dev);
	struct flash_platform_data *plat = dev->dev.platform_data;
	struct ixp4xx_flash_info *info;
	int err = -1;

	if (!plat)
		return -ENODEV;

	if (plat->init) {
		err = plat->init();
		if (err)
			return err;
	}

	info = kmalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
	if(!info) {
		err = -ENOMEM;
		goto Error;
	}	
	memzero(info, sizeof(struct ixp4xx_flash_info));

	dev_set_drvdata(&dev->dev, info);

	/*
	 * Tell the MTD layer we're not 1:1 mapped so that it does
	 * not attempt to do a direct access on us.
	 */
	info->map.phys = NO_XIP;
	info->map.size = dev->resource->end - dev->resource->start + 1;

	/*
	 * We only support 16-bit accesses for now. If and when
	 * any board use 8-bit access, we'll fixup the driver to
	 * handle that.
	 */
	info->map.bankwidth = 2;
	info->map.name = dev->dev.bus_id;
	info->map.read = ixp4xx_read16,
	info->map.write = ixp4xx_probe_write16,
	info->map.copy_from = ixp4xx_copy_from,

	info->res = request_mem_region(dev->resource->start, 
			dev->resource->end - dev->resource->start + 1, 
			"IXP4XXFlash");
	if (!info->res) {
		printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n");
		err = -ENOMEM;
		goto Error;
	}

	info->map.map_priv_1 = ioremap(dev->resource->start,
			    dev->resource->end - dev->resource->start + 1);
	if (!info->map.map_priv_1) {
		printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
		err = -EIO;
		goto Error;
	}

	info->mtd = do_map_probe(plat->map_name, &info->map);
	if (!info->mtd) {
		printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
		err = -ENXIO;
		goto Error;
	}
	info->mtd->owner = THIS_MODULE;
	
	/* Use the fast version */
	info->map.write = ixp4xx_write16,

	err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
	if (err > 0) {
		err = add_mtd_partitions(info->mtd, info->partitions, err);
		if(err)
			printk(KERN_ERR "Could not parse partitions\n");
	}

	if (err)
		goto Error;

	return 0;

Error:
	ixp4xx_flash_remove(_dev);
	return err;
}

static struct device_driver ixp4xx_flash_driver = {
	.name		= "IXP4XX-Flash",
	.bus		= &platform_bus_type,
	.probe		= ixp4xx_flash_probe,
	.remove		= ixp4xx_flash_remove,
};

static int __init ixp4xx_flash_init(void)
{
	return driver_register(&ixp4xx_flash_driver);
}

static void __exit ixp4xx_flash_exit(void)
{
	driver_unregister(&ixp4xx_flash_driver);
}


module_init(ixp4xx_flash_init);
module_exit(ixp4xx_flash_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems");
MODULE_AUTHOR("Deepak Saxena");
Commit	Line	Data
1da177e4	1	/*
e4c212ef	2	* $Id: ixp4xx.c,v 1.8 2005/09/08 10:32:20 dvrabel Exp $
1da177e4 LT	3	*
	4	* drivers/mtd/maps/ixp4xx.c
	5	*
	6	* MTD Map file for IXP4XX based systems. Please do not make per-board
	7	* changes in here. If your board needs special setup, do it in your
	8	* platform level code in arch/arm/mach-ixp4xx/board-setup.c
	9	*
	10	* Original Author: Intel Corporation
	11	* Maintainer: Deepak Saxena <dsaxena@mvista.com>
	12	*
	13	* Copyright (C) 2002 Intel Corporation
	14	* Copyright (C) 2003-2004 MontaVista Software, Inc.
	15	*
	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/types.h>
	20	#include <linux/init.h>
	21	#include <linux/kernel.h>
	22	#include <linux/string.h>
4e57b681 TS	23	#include <linux/slab.h>
	24	#include <linux/ioport.h>
	25	#include <linux/device.h>
4fd5f826	26	#include <linux/platform_device.h>
4e57b681	27
1da177e4 LT	28	#include <linux/mtd/mtd.h>
	29	#include <linux/mtd/map.h>
	30	#include <linux/mtd/partitions.h>
4e57b681	31
1da177e4	32	#include <asm/io.h>
1da177e4 LT	33	#include <asm/mach/flash.h>
	34
	35	#include <linux/reboot.h>
	36
	37	#ifndef __ARMEB__
	38	#define BYTE0(h) ((h) & 0xFF)
	39	#define BYTE1(h) (((h) >> 8) & 0xFF)
	40	#else
	41	#define BYTE0(h) (((h) >> 8) & 0xFF)
	42	#define BYTE1(h) ((h) & 0xFF)
	43	#endif
	44
	45	static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
	46	{
	47	map_word val;
	48	val.x[0] = (__u16 ) (map->map_priv_1 + ofs);
	49	return val;
	50	}
	51
	52	/*
	53	* The IXP4xx expansion bus only allows 16-bit wide acceses
	54	* when attached to a 16-bit wide device (such as the 28F128J3A),
	55	* so we can't just memcpy_fromio().
	56	*/
	57	static void ixp4xx_copy_from(struct map_info map, void to,
	58	unsigned long from, ssize_t len)
	59	{
	60	int i;
	61	u8 dest = (u8 ) to;
	62	u16 src = (u16 ) (map->map_priv_1 + from);
	63	u16 data;
	64
	65	for (i = 0; i < (len / 2); i++) {
	66	data = src[i];
	67	dest[i * 2] = BYTE0(data);
	68	dest[i * 2 + 1] = BYTE1(data);
	69	}
	70
	71	if (len & 1)
	72	dest[len - 1] = BYTE0(src[i]);
	73	}
	74
	75	/*
	76	* Unaligned writes are ignored, causing the 8-bit
	77	* probe to fail and proceed to the 16-bit probe (which succeeds).
	78	*/
	79	static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
	80	{
	81	if (!(adr & 1))
	82	(__u16 ) (map->map_priv_1 + adr) = d.x[0];
	83	}
	84
	85	/*
	86	* Fast write16 function without the probing check above
	87	*/
	88	static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
	89	{
	90	(__u16 ) (map->map_priv_1 + adr) = d.x[0];
	91	}
	92
	93	struct ixp4xx_flash_info {
	94	struct mtd_info *mtd;
	95	struct map_info map;
	96	struct mtd_partition *partitions;
97	struct resource *res;
98	};
99
100	static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
101
102	static int ixp4xx_flash_remove(struct device *_dev)
103	{
104	struct platform_device *dev = to_platform_device(_dev);
105	struct flash_platform_data *plat = dev->dev.platform_data;
106	struct ixp4xx_flash_info *info = dev_get_drvdata(&dev->dev);
107	map_word d;
108
109	dev_set_drvdata(&dev->dev, NULL);
110
111	if(!info)
112	return 0;
113
1da177e4 LT	114	if (info->mtd) {
	115	del_mtd_partitions(info->mtd);
	116	map_destroy(info->mtd);
	117	}
	118	if (info->map.map_priv_1)
	119	iounmap((void *) info->map.map_priv_1);
	120
	121	if (info->partitions)
	122	kfree(info->partitions);
	123
	124	if (info->res) {
	125	release_resource(info->res);
	126	kfree(info->res);
	127	}
	128
	129	if (plat->exit)
	130	plat->exit();
	131
1da177e4 LT	132	return 0;
	133	}
	134
	135	static int ixp4xx_flash_probe(struct device *_dev)
	136	{
	137	struct platform_device *dev = to_platform_device(_dev);
	138	struct flash_platform_data *plat = dev->dev.platform_data;
	139	struct ixp4xx_flash_info *info;
	140	int err = -1;
	141
	142	if (!plat)
	143	return -ENODEV;
	144
	145	if (plat->init) {
	146	err = plat->init();
	147	if (err)
	148	return err;
	149	}
	150
	151	info = kmalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
	152	if(!info) {
	153	err = -ENOMEM;
	154	goto Error;
	155	}
	156	memzero(info, sizeof(struct ixp4xx_flash_info));
	157
	158	dev_set_drvdata(&dev->dev, info);
	159
1da177e4 LT	160	/*
	161	* Tell the MTD layer we're not 1:1 mapped so that it does
	162	* not attempt to do a direct access on us.
	163	*/
	164	info->map.phys = NO_XIP;
	165	info->map.size = dev->resource->end - dev->resource->start + 1;
	166
	167	/*
	168	* We only support 16-bit accesses for now. If and when
	169	* any board use 8-bit access, we'll fixup the driver to
	170	* handle that.
	171	*/
	172	info->map.bankwidth = 2;
	173	info->map.name = dev->dev.bus_id;
	174	info->map.read = ixp4xx_read16,
	175	info->map.write = ixp4xx_probe_write16,
	176	info->map.copy_from = ixp4xx_copy_from,
	177
	178	info->res = request_mem_region(dev->resource->start,
	179	dev->resource->end - dev->resource->start + 1,
	180	"IXP4XXFlash");
	181	if (!info->res) {
	182	printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n");
	183	err = -ENOMEM;
	184	goto Error;
	185	}
	186
	187	info->map.map_priv_1 = ioremap(dev->resource->start,
	188	dev->resource->end - dev->resource->start + 1);
	189	if (!info->map.map_priv_1) {
	190	printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
	191	err = -EIO;
	192	goto Error;
	193	}
	194
	195	info->mtd = do_map_probe(plat->map_name, &info->map);
	196	if (!info->mtd) {
	197	printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
	198	err = -ENXIO;
	199	goto Error;
	200	}
	201	info->mtd->owner = THIS_MODULE;
	202
	203	/* Use the fast version */
	204	info->map.write = ixp4xx_write16,
	205
	206	err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
	207	if (err > 0) {
	208	err = add_mtd_partitions(info->mtd, info->partitions, err);
	209	if(err)
	210	printk(KERN_ERR "Could not parse partitions\n");
	211	}
	212
	213	if (err)
	214	goto Error;
	215
	216	return 0;
	217
	218	Error:
	219	ixp4xx_flash_remove(_dev);
	220	return err;
	221	}
	222
	223	static struct device_driver ixp4xx_flash_driver = {
224	.name = "IXP4XX-Flash",
225	.bus = &platform_bus_type,
226	.probe = ixp4xx_flash_probe,
227	.remove = ixp4xx_flash_remove,
228	};
229
230	static int __init ixp4xx_flash_init(void)
231	{
232	return driver_register(&ixp4xx_flash_driver);
233	}
234
235	static void __exit ixp4xx_flash_exit(void)
236	{
237	driver_unregister(&ixp4xx_flash_driver);
238	}
239
240
241	module_init(ixp4xx_flash_init);
242	module_exit(ixp4xx_flash_exit);
243
244	MODULE_LICENSE("GPL");
82810a90	245	MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems");
1da177e4 LT	246	MODULE_AUTHOR("Deepak Saxena");
1da177e4 LT	247