[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mtd / maps / pxa2xx-flash.c

/*
 * Map driver for Intel XScale PXA2xx platforms.
 *
 * Author:	Nicolas Pitre
 * Copyright:	(C) 2001 MontaVista Software Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/init.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 <mach/hardware.h>

#include <asm/mach/flash.h>

#define CACHELINESIZE	32

static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
				      ssize_t len)
{
	unsigned long start = (unsigned long)map->cached + from;
	unsigned long end = start + len;

	start &= ~(CACHELINESIZE - 1);
	while (start < end) {
		/* invalidate D cache line */
		asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
		start += CACHELINESIZE;
	}
}

struct pxa2xx_flash_info {
	struct mtd_partition	*parts;
	int			nr_parts;
	struct mtd_info		*mtd;
	struct map_info		map;
};


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


static int __devinit pxa2xx_flash_probe(struct platform_device *pdev)
{
	struct flash_platform_data *flash = pdev->dev.platform_data;
	struct pxa2xx_flash_info *info;
	struct mtd_partition *parts;
	struct resource *res;
	int ret = 0;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

	info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->map.name = (char *) flash->name;
	info->map.bankwidth = flash->width;
	info->map.phys = res->start;
	info->map.size = res->end - res->start + 1;
	info->parts = flash->parts;
	info->nr_parts = flash->nr_parts;

	info->map.virt = ioremap(info->map.phys, info->map.size);
	if (!info->map.virt) {
		printk(KERN_WARNING "Failed to ioremap %s\n",
		       info->map.name);
		return -ENOMEM;
	}
	info->map.cached =
		ioremap_cached(info->map.phys, info->map.size);
	if (!info->map.cached)
		printk(KERN_WARNING "Failed to ioremap cached %s\n",
		       info->map.name);
	info->map.inval_cache = pxa2xx_map_inval_cache;
	simple_map_init(&info->map);

	printk(KERN_NOTICE
	       "Probing %s at physical address 0x%08lx"
	       " (%d-bit bankwidth)\n",
	       info->map.name, (unsigned long)info->map.phys,
	       info->map.bankwidth * 8);

	info->mtd = do_map_probe(flash->map_name, &info->map);

	if (!info->mtd) {
		iounmap((void *)info->map.virt);
		if (info->map.cached)
			iounmap(info->map.cached);
		return -EIO;
	}
	info->mtd->owner = THIS_MODULE;

#ifdef CONFIG_MTD_PARTITIONS
	ret = parse_mtd_partitions(info->mtd, probes, &parts, 0);

	if (ret > 0) {
		info->nr_parts = ret;
		info->parts = parts;
	}
#endif

	if (info->nr_parts) {
		add_mtd_partitions(info->mtd, info->parts,
				   info->nr_parts);
	} else {
		printk("Registering %s as whole device\n",
		       info->map.name);
		add_mtd_device(info->mtd);
	}

	platform_set_drvdata(pdev, info);
	return 0;
}

static int __devexit pxa2xx_flash_remove(struct platform_device *dev)
{
	struct pxa2xx_flash_info *info = platform_get_drvdata(dev);

	platform_set_drvdata(dev, NULL);

#ifdef CONFIG_MTD_PARTITIONS
	if (info->nr_parts)
		del_mtd_partitions(info->mtd);
	else
#endif
		del_mtd_device(info->mtd);

	map_destroy(info->mtd);
	iounmap(info->map.virt);
	if (info->map.cached)
		iounmap(info->map.cached);
	kfree(info->parts);
	kfree(info);
	return 0;
}

#ifdef CONFIG_PM
static void pxa2xx_flash_shutdown(struct platform_device *dev)
{
	struct pxa2xx_flash_info *info = platform_get_drvdata(dev);

	if (info && info->mtd->suspend(info->mtd) == 0)
		info->mtd->resume(info->mtd);
}
#else
#define pxa2xx_flash_shutdown NULL
#endif

static struct platform_driver pxa2xx_flash_driver = {
	.driver = {
		.name		= "pxa2xx-flash",
		.owner		= THIS_MODULE,
	},
	.probe		= pxa2xx_flash_probe,
	.remove		= __devexit_p(pxa2xx_flash_remove),
	.shutdown	= pxa2xx_flash_shutdown,
};

static int __init init_pxa2xx_flash(void)
{
	return platform_driver_register(&pxa2xx_flash_driver);
}

static void __exit cleanup_pxa2xx_flash(void)
{
	platform_driver_unregister(&pxa2xx_flash_driver);
}

module_init(init_pxa2xx_flash);
module_exit(cleanup_pxa2xx_flash);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
Commit	Line	Data
e644f7d6 TP	1	/*
	2	* Map driver for Intel XScale PXA2xx platforms.
	3	*
	4	* Author: Nicolas Pitre
	5	* Copyright: (C) 2001 MontaVista Software Inc.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/types.h>
5a0e3ad6	14	#include <linux/slab.h>
e644f7d6 TP	15	#include <linux/kernel.h>
	16	#include <linux/init.h>
	17	#include <linux/platform_device.h>
e644f7d6 TP	18	#include <linux/mtd/mtd.h>
	19	#include <linux/mtd/map.h>
	20	#include <linux/mtd/partitions.h>
	21
	22	#include <asm/io.h>
a09e64fb	23	#include <mach/hardware.h>
e644f7d6 TP	24
	25	#include <asm/mach/flash.h>
	26
ccaf5f05 NP	27	#define CACHELINESIZE 32
ccaf5f05 NP	28
e644f7d6 TP	29	static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
	30	ssize_t len)
	31	{
ccaf5f05 NP	32	unsigned long start = (unsigned long)map->cached + from;
	33	unsigned long end = start + len;
	34
	35	start &= ~(CACHELINESIZE - 1);
	36	while (start < end) {
	37	/* invalidate D cache line */
	38	asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
	39	start += CACHELINESIZE;
	40	}
e644f7d6 TP	41	}
	42
	43	struct pxa2xx_flash_info {
	44	struct mtd_partition *parts;
	45	int nr_parts;
	46	struct mtd_info *mtd;
	47	struct map_info map;
	48	};
	49
	50
	51	static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
	52
	53
f9d1bf75	54	static int __devinit pxa2xx_flash_probe(struct platform_device *pdev)
e644f7d6	55	{
e644f7d6 TP	56	struct flash_platform_data *flash = pdev->dev.platform_data;
	57	struct pxa2xx_flash_info *info;
	58	struct mtd_partition *parts;
	59	struct resource *res;
	60	int ret = 0;
	61
	62	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	63	if (!res)
	64	return -ENODEV;
	65
2bfefa4c	66	info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
e644f7d6 TP	67	if (!info)
	68	return -ENOMEM;
	69
e644f7d6 TP	70	info->map.name = (char *) flash->name;
	71	info->map.bankwidth = flash->width;
	72	info->map.phys = res->start;
	73	info->map.size = res->end - res->start + 1;
	74	info->parts = flash->parts;
	75	info->nr_parts = flash->nr_parts;
	76
	77	info->map.virt = ioremap(info->map.phys, info->map.size);
	78	if (!info->map.virt) {
	79	printk(KERN_WARNING "Failed to ioremap %s\n",
	80	info->map.name);
	81	return -ENOMEM;
	82	}
	83	info->map.cached =
	84	ioremap_cached(info->map.phys, info->map.size);
	85	if (!info->map.cached)
	86	printk(KERN_WARNING "Failed to ioremap cached %s\n",
	87	info->map.name);
	88	info->map.inval_cache = pxa2xx_map_inval_cache;
	89	simple_map_init(&info->map);
	90
	91	printk(KERN_NOTICE
	92	"Probing %s at physical address 0x%08lx"
	93	" (%d-bit bankwidth)\n",
	94	info->map.name, (unsigned long)info->map.phys,
	95	info->map.bankwidth * 8);
	96
	97	info->mtd = do_map_probe(flash->map_name, &info->map);
	98
	99	if (!info->mtd) {
	100	iounmap((void *)info->map.virt);
	101	if (info->map.cached)
	102	iounmap(info->map.cached);
	103	return -EIO;
	104	}
	105	info->mtd->owner = THIS_MODULE;
	106
	107	#ifdef CONFIG_MTD_PARTITIONS
	108	ret = parse_mtd_partitions(info->mtd, probes, &parts, 0);
	109
	110	if (ret > 0) {
	111	info->nr_parts = ret;
	112	info->parts = parts;
	113	}
	114	#endif
	115
	116	if (info->nr_parts) {
	117	add_mtd_partitions(info->mtd, info->parts,
	118	info->nr_parts);
	119	} else {
	120	printk("Registering %s as whole device\n",
	121	info->map.name);
	122	add_mtd_device(info->mtd);
	123	}
	124
7a192ec3	125	platform_set_drvdata(pdev, info);
e644f7d6 TP	126	return 0;
	127	}
	128
67a52bb9	129	static int __devexit pxa2xx_flash_remove(struct platform_device *dev)
e644f7d6	130	{
7a192ec3	131	struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
e644f7d6	132
7a192ec3	133	platform_set_drvdata(dev, NULL);
e644f7d6 TP	134
	135	#ifdef CONFIG_MTD_PARTITIONS
	136	if (info->nr_parts)
	137	del_mtd_partitions(info->mtd);
	138	else
	139	#endif
	140	del_mtd_device(info->mtd);
	141
	142	map_destroy(info->mtd);
	143	iounmap(info->map.virt);
	144	if (info->map.cached)
	145	iounmap(info->map.cached);
	146	kfree(info->parts);
	147	kfree(info);
	148	return 0;
	149	}
	150
	151	#ifdef CONFIG_PM
7a192ec3	152	static void pxa2xx_flash_shutdown(struct platform_device *dev)
e644f7d6	153	{
7a192ec3	154	struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
e644f7d6 TP	155
	156	if (info && info->mtd->suspend(info->mtd) == 0)
	157	info->mtd->resume(info->mtd);
	158	}
	159	#else
e644f7d6 TP	160	#define pxa2xx_flash_shutdown NULL
	161	#endif
	162
7a192ec3 ML	163	static struct platform_driver pxa2xx_flash_driver = {
	164	.driver = {
	165	.name = "pxa2xx-flash",
	166	.owner = THIS_MODULE,
	167	},
e644f7d6	168	.probe = pxa2xx_flash_probe,
7a192ec3	169	.remove = __devexit_p(pxa2xx_flash_remove),
e644f7d6 TP	170	.shutdown = pxa2xx_flash_shutdown,
	171	};
	172
	173	static int __init init_pxa2xx_flash(void)
	174	{
7a192ec3	175	return platform_driver_register(&pxa2xx_flash_driver);
e644f7d6 TP	176	}
	177
	178	static void __exit cleanup_pxa2xx_flash(void)
	179	{
7a192ec3	180	platform_driver_unregister(&pxa2xx_flash_driver);
e644f7d6 TP	181	}
	182
	183	module_init(init_pxa2xx_flash);
	184	module_exit(cleanup_pxa2xx_flash);
	185
	186	MODULE_LICENSE("GPL");
2f82af08	187	MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
e644f7d6	188	MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");