[deliverable/linux.git] / drivers / mtd / maps / sbc8240.c

/*
 * Handle mapping of the flash memory access routines on the SBC8240 board.
 *
 * Carolyn Smith, Tektronix, Inc.
 *
 * This code is GPLed
 */

/*
 * The SBC8240 has 2 flash banks.
 * Bank 0 is a 512 KiB AMD AM29F040B; 8 x 64 KiB sectors.
 * It contains the U-Boot code (7 sectors) and the environment (1 sector).
 * Bank 1 is 4 x 1 MiB AMD AM29LV800BT; 15 x 64 KiB sectors, 1 x 32 KiB sector,
 * 2 x 8 KiB sectors, 1 x 16 KiB sectors.
 * Both parts are JEDEC compatible.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>

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

#ifdef CONFIG_MTD_PARTITIONS
#include <linux/mtd/partitions.h>
#endif

#define	DEBUG

#ifdef	DEBUG
# define debugk(fmt,args...)	printk(fmt ,##args)
#else
# define debugk(fmt,args...)
#endif


#define WINDOW_ADDR0	0xFFF00000		/* 512 KiB */
#define WINDOW_SIZE0	0x00080000
#define BUSWIDTH0	1

#define WINDOW_ADDR1	0xFF000000		/* 4 MiB */
#define WINDOW_SIZE1	0x00400000
#define BUSWIDTH1	8

#define MSG_PREFIX "sbc8240:"	/* prefix for our printk()'s */
#define MTDID	   "sbc8240-%d"	/* for mtdparts= partitioning */


static struct map_info sbc8240_map[2] = {
	{
		.name           = "sbc8240 Flash Bank #0",
		.size           = WINDOW_SIZE0,
		.bankwidth       = BUSWIDTH0,
	},
	{
		.name           = "sbc8240 Flash Bank #1",
		.size           = WINDOW_SIZE1,
		.bankwidth       = BUSWIDTH1,
	}
};

#define NUM_FLASH_BANKS	ARRAY_SIZE(sbc8240_map)

/*
 * The following defines the partition layout of SBC8240 boards.
 *
 * See include/linux/mtd/partitions.h for definition of the
 * mtd_partition structure.
 *
 * The *_max_flash_size is the maximum possible mapped flash size
 * which is not necessarily the actual flash size. It must correspond
 * to the value specified in the mapping definition defined by the
 * "struct map_desc *_io_desc" for the corresponding machine.
 */

#ifdef CONFIG_MTD_PARTITIONS

static struct mtd_partition sbc8240_uboot_partitions [] = {
	/* Bank 0 */
	{
		.name =	"U-boot",			/* U-Boot Firmware	*/
		.offset =	0,
		.size =	0x00070000,			/*  7 x 64 KiB sectors 	*/
		.mask_flags = MTD_WRITEABLE,		/*  force read-only	*/
	},
	{
		.name =	"environment",			/* U-Boot environment	*/
		.offset =	0x00070000,
		.size =	0x00010000,			/*  1 x 64 KiB sector	*/
	},
};

static struct mtd_partition sbc8240_fs_partitions [] = {
	{
		.name =	"jffs",				/* JFFS  filesystem	*/
		.offset =	0,
		.size =	0x003C0000,			/*  4 * 15 * 64KiB	*/
	},
	{
		.name =	"tmp32",
		.offset =	0x003C0000,
		.size =	0x00020000,			/*  4 * 32KiB		*/
	},
	{
		.name =	"tmp8a",
		.offset =	0x003E0000,
		.size =	0x00008000,			/*  4 * 8KiB		*/
	},
	{
		.name =	"tmp8b",
		.offset =	0x003E8000,
		.size =	0x00008000,			/*  4 * 8KiB		*/
	},
	{
		.name =	"tmp16",
		.offset =	0x003F0000,
		.size =	0x00010000,			/*  4 * 16KiB		*/
	}
};

/* trivial struct to describe partition information */
struct mtd_part_def
{
	int nums;
	unsigned char *type;
	struct mtd_partition* mtd_part;
};

static struct mtd_info *sbc8240_mtd[NUM_FLASH_BANKS];
static struct mtd_part_def sbc8240_part_banks[NUM_FLASH_BANKS];


#endif	/* CONFIG_MTD_PARTITIONS */


static int __init init_sbc8240_mtd (void)
{
	static struct _cjs {
		u_long addr;
		u_long size;
	} pt[NUM_FLASH_BANKS] = {
		{
			.addr = WINDOW_ADDR0,
			.size = WINDOW_SIZE0
		},
		{
			.addr = WINDOW_ADDR1,
			.size = WINDOW_SIZE1
		},
	};

	int devicesfound = 0;
	int i,j;

	for (i = 0; i < NUM_FLASH_BANKS; i++) {
		printk (KERN_NOTICE MSG_PREFIX
			"Probing 0x%08lx at 0x%08lx\n", pt[i].size, pt[i].addr);

		sbc8240_map[i].map_priv_1 =
			(unsigned long) ioremap (pt[i].addr, pt[i].size);
		if (!sbc8240_map[i].map_priv_1) {
			printk (MSG_PREFIX "failed to ioremap\n");
			for (j = 0; j < i; j++) {
				iounmap((void *) sbc8240_map[j].map_priv_1);
				sbc8240_map[j].map_priv_1 = 0;
			}
			return -EIO;
		}
		simple_map_init(&sbc8240_mtd[i]);

		sbc8240_mtd[i] = do_map_probe("jedec_probe", &sbc8240_map[i]);

		if (sbc8240_mtd[i]) {
			sbc8240_mtd[i]->module = THIS_MODULE;
			devicesfound++;
		} else {
			if (sbc8240_map[i].map_priv_1) {
				iounmap((void *) sbc8240_map[i].map_priv_1);
				sbc8240_map[i].map_priv_1 = 0;
			}
		}
	}

	if (!devicesfound) {
		printk(KERN_NOTICE MSG_PREFIX
		       "No suppported flash chips found!\n");
		return -ENXIO;
	}

#ifdef CONFIG_MTD_PARTITIONS
	sbc8240_part_banks[0].mtd_part   = sbc8240_uboot_partitions;
	sbc8240_part_banks[0].type       = "static image";
	sbc8240_part_banks[0].nums       = ARRAY_SIZE(sbc8240_uboot_partitions);
	sbc8240_part_banks[1].mtd_part   = sbc8240_fs_partitions;
	sbc8240_part_banks[1].type       = "static file system";
	sbc8240_part_banks[1].nums       = ARRAY_SIZE(sbc8240_fs_partitions);

	for (i = 0; i < NUM_FLASH_BANKS; i++) {

		if (!sbc8240_mtd[i]) continue;
		if (sbc8240_part_banks[i].nums == 0) {
			printk (KERN_NOTICE MSG_PREFIX
				"No partition info available, registering whole device\n");
			add_mtd_device(sbc8240_mtd[i]);
		} else {
			printk (KERN_NOTICE MSG_PREFIX
				"Using %s partition definition\n", sbc8240_part_banks[i].mtd_part->name);
			add_mtd_partitions (sbc8240_mtd[i],
					    sbc8240_part_banks[i].mtd_part,
					    sbc8240_part_banks[i].nums);
		}
	}
#else
	printk(KERN_NOTICE MSG_PREFIX
	       "Registering %d flash banks at once\n", devicesfound);

	for (i = 0; i < devicesfound; i++) {
		add_mtd_device(sbc8240_mtd[i]);
	}
#endif	/* CONFIG_MTD_PARTITIONS */

	return devicesfound == 0 ? -ENXIO : 0;
}

static void __exit cleanup_sbc8240_mtd (void)
{
	int i;

	for (i = 0; i < NUM_FLASH_BANKS; i++) {
		if (sbc8240_mtd[i]) {
			del_mtd_device (sbc8240_mtd[i]);
			map_destroy (sbc8240_mtd[i]);
		}
		if (sbc8240_map[i].map_priv_1) {
			iounmap ((void *) sbc8240_map[i].map_priv_1);
			sbc8240_map[i].map_priv_1 = 0;
		}
	}
}

module_init (init_sbc8240_mtd);
module_exit (cleanup_sbc8240_mtd);

MODULE_LICENSE ("GPL");
MODULE_AUTHOR ("Carolyn Smith <carolyn.smith@tektronix.com>");
MODULE_DESCRIPTION ("MTD map driver for SBC8240 boards");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Handle mapping of the flash memory access routines on the SBC8240 board.
	3	*
	4	* Carolyn Smith, Tektronix, Inc.
	5	*
	6	* This code is GPLed
1da177e4 LT	7	*/
	8
	9	/*
	10	* The SBC8240 has 2 flash banks.
	11	* Bank 0 is a 512 KiB AMD AM29F040B; 8 x 64 KiB sectors.
	12	* It contains the U-Boot code (7 sectors) and the environment (1 sector).
	13	* Bank 1 is 4 x 1 MiB AMD AM29LV800BT; 15 x 64 KiB sectors, 1 x 32 KiB sector,
	14	* 2 x 8 KiB sectors, 1 x 16 KiB sectors.
	15	* Both parts are JEDEC compatible.
	16	*/
	17
1da177e4 LT	18	#include <linux/module.h>
	19	#include <linux/types.h>
	20	#include <linux/kernel.h>
	21	#include <asm/io.h>
	22
	23	#include <linux/mtd/mtd.h>
	24	#include <linux/mtd/map.h>
	25	#include <linux/mtd/cfi.h>
	26
	27	#ifdef CONFIG_MTD_PARTITIONS
	28	#include <linux/mtd/partitions.h>
	29	#endif
	30
	31	#define DEBUG
	32
	33	#ifdef DEBUG
	34	# define debugk(fmt,args...) printk(fmt ,##args)
	35	#else
	36	# define debugk(fmt,args...)
	37	#endif
	38
	39
	40	#define WINDOW_ADDR0 0xFFF00000 /* 512 KiB */
	41	#define WINDOW_SIZE0 0x00080000
	42	#define BUSWIDTH0 1
	43
	44	#define WINDOW_ADDR1 0xFF000000 /* 4 MiB */
	45	#define WINDOW_SIZE1 0x00400000
	46	#define BUSWIDTH1 8
	47
	48	#define MSG_PREFIX "sbc8240:" /* prefix for our printk()'s */
	49	#define MTDID "sbc8240-%d" /* for mtdparts= partitioning */
	50
	51
	52	static struct map_info sbc8240_map[2] = {
	53	{
	54	.name = "sbc8240 Flash Bank #0",
	55	.size = WINDOW_SIZE0,
	56	.bankwidth = BUSWIDTH0,
	57	},
	58	{
	59	.name = "sbc8240 Flash Bank #1",
	60	.size = WINDOW_SIZE1,
	61	.bankwidth = BUSWIDTH1,
	62	}
	63	};
	64
87d10f3c	65	#define NUM_FLASH_BANKS ARRAY_SIZE(sbc8240_map)
1da177e4 LT	66
	67	/*
	68	* The following defines the partition layout of SBC8240 boards.
	69	*
	70	* See include/linux/mtd/partitions.h for definition of the
	71	* mtd_partition structure.
	72	*
	73	* The *_max_flash_size is the maximum possible mapped flash size
	74	* which is not necessarily the actual flash size. It must correspond
	75	* to the value specified in the mapping definition defined by the
	76	* "struct map_desc *_io_desc" for the corresponding machine.
	77	*/
	78
	79	#ifdef CONFIG_MTD_PARTITIONS
	80
	81	static struct mtd_partition sbc8240_uboot_partitions [] = {
	82	/* Bank 0 */
	83	{
	84	.name = "U-boot", /* U-Boot Firmware */
	85	.offset = 0,
	86	.size = 0x00070000, /* 7 x 64 KiB sectors */
	87	.mask_flags = MTD_WRITEABLE, /* force read-only */
	88	},
	89	{
	90	.name = "environment", /* U-Boot environment */
	91	.offset = 0x00070000,
	92	.size = 0x00010000, /* 1 x 64 KiB sector */
	93	},
	94	};
	95
	96	static struct mtd_partition sbc8240_fs_partitions [] = {
	97	{
	98	.name = "jffs", /* JFFS filesystem */
	99	.offset = 0,
	100	.size = 0x003C0000, /* 4 * 15 * 64KiB */
	101	},
	102	{
	103	.name = "tmp32",
	104	.offset = 0x003C0000,
	105	.size = 0x00020000, /* 4 * 32KiB */
	106	},
	107	{
	108	.name = "tmp8a",
	109	.offset = 0x003E0000,
	110	.size = 0x00008000, /* 4 * 8KiB */
	111	},
	112	{
	113	.name = "tmp8b",
	114	.offset = 0x003E8000,
	115	.size = 0x00008000, /* 4 * 8KiB */
	116	},
	117	{
	118	.name = "tmp16",
	119	.offset = 0x003F0000,
	120	.size = 0x00010000, /* 4 * 16KiB */
	121	}
	122	};
	123
1da177e4 LT	124	/* trivial struct to describe partition information */
	125	struct mtd_part_def
	126	{
	127	int nums;
	128	unsigned char *type;
	129	struct mtd_partition* mtd_part;
	130	};
	131
	132	static struct mtd_info *sbc8240_mtd[NUM_FLASH_BANKS];
	133	static struct mtd_part_def sbc8240_part_banks[NUM_FLASH_BANKS];
	134
	135
	136	#endif /* CONFIG_MTD_PARTITIONS */
	137
	138
9ee49fa5	139	static int __init init_sbc8240_mtd (void)
1da177e4 LT	140	{
	141	static struct _cjs {
	142	u_long addr;
	143	u_long size;
	144	} pt[NUM_FLASH_BANKS] = {
	145	{
	146	.addr = WINDOW_ADDR0,
	147	.size = WINDOW_SIZE0
	148	},
	149	{
	150	.addr = WINDOW_ADDR1,
	151	.size = WINDOW_SIZE1
	152	},
	153	};
	154
	155	int devicesfound = 0;
25f0c659	156	int i,j;
1da177e4 LT	157
	158	for (i = 0; i < NUM_FLASH_BANKS; i++) {
	159	printk (KERN_NOTICE MSG_PREFIX
	160	"Probing 0x%08lx at 0x%08lx\n", pt[i].size, pt[i].addr);
	161
	162	sbc8240_map[i].map_priv_1 =
	163	(unsigned long) ioremap (pt[i].addr, pt[i].size);
	164	if (!sbc8240_map[i].map_priv_1) {
	165	printk (MSG_PREFIX "failed to ioremap\n");
25f0c659 AL	166	for (j = 0; j < i; j++) {
	167	iounmap((void *) sbc8240_map[j].map_priv_1);
	168	sbc8240_map[j].map_priv_1 = 0;
	169	}
1da177e4 LT	170	return -EIO;
	171	}
	172	simple_map_init(&sbc8240_mtd[i]);
	173
	174	sbc8240_mtd[i] = do_map_probe("jedec_probe", &sbc8240_map[i]);
	175
	176	if (sbc8240_mtd[i]) {
	177	sbc8240_mtd[i]->module = THIS_MODULE;
	178	devicesfound++;
25f0c659 AL	179	} else {
	180	if (sbc8240_map[i].map_priv_1) {
	181	iounmap((void *) sbc8240_map[i].map_priv_1);
	182	sbc8240_map[i].map_priv_1 = 0;
	183	}
1da177e4 LT	184	}
	185	}
	186
	187	if (!devicesfound) {
	188	printk(KERN_NOTICE MSG_PREFIX
	189	"No suppported flash chips found!\n");
	190	return -ENXIO;
	191	}
	192
	193	#ifdef CONFIG_MTD_PARTITIONS
	194	sbc8240_part_banks[0].mtd_part = sbc8240_uboot_partitions;
	195	sbc8240_part_banks[0].type = "static image";
87d10f3c	196	sbc8240_part_banks[0].nums = ARRAY_SIZE(sbc8240_uboot_partitions);
1da177e4 LT	197	sbc8240_part_banks[1].mtd_part = sbc8240_fs_partitions;
1da177e4 LT	198	sbc8240_part_banks[1].type = "static file system";
87d10f3c	199	sbc8240_part_banks[1].nums = ARRAY_SIZE(sbc8240_fs_partitions);
1da177e4 LT	200
	201	for (i = 0; i < NUM_FLASH_BANKS; i++) {
	202
	203	if (!sbc8240_mtd[i]) continue;
	204	if (sbc8240_part_banks[i].nums == 0) {
	205	printk (KERN_NOTICE MSG_PREFIX
	206	"No partition info available, registering whole device\n");
	207	add_mtd_device(sbc8240_mtd[i]);
	208	} else {
	209	printk (KERN_NOTICE MSG_PREFIX
	210	"Using %s partition definition\n", sbc8240_part_banks[i].mtd_part->name);
69f34c98	211	add_mtd_partitions (sbc8240_mtd[i],
1da177e4 LT	212	sbc8240_part_banks[i].mtd_part,
	213	sbc8240_part_banks[i].nums);
	214	}
	215	}
	216	#else
	217	printk(KERN_NOTICE MSG_PREFIX
	218	"Registering %d flash banks at once\n", devicesfound);
	219
	220	for (i = 0; i < devicesfound; i++) {
	221	add_mtd_device(sbc8240_mtd[i]);
	222	}
	223	#endif /* CONFIG_MTD_PARTITIONS */
	224
	225	return devicesfound == 0 ? -ENXIO : 0;
	226	}
	227
	228	static void __exit cleanup_sbc8240_mtd (void)
	229	{
	230	int i;
	231
	232	for (i = 0; i < NUM_FLASH_BANKS; i++) {
	233	if (sbc8240_mtd[i]) {
	234	del_mtd_device (sbc8240_mtd[i]);
	235	map_destroy (sbc8240_mtd[i]);
	236	}
	237	if (sbc8240_map[i].map_priv_1) {
	238	iounmap ((void *) sbc8240_map[i].map_priv_1);
	239	sbc8240_map[i].map_priv_1 = 0;
	240	}
	241	}
	242	}
	243
	244	module_init (init_sbc8240_mtd);
	245	module_exit (cleanup_sbc8240_mtd);
	246
	247	MODULE_LICENSE ("GPL");
	248	MODULE_AUTHOR ("Carolyn Smith <carolyn.smith@tektronix.com>");
	249	MODULE_DESCRIPTION ("MTD map driver for SBC8240 boards");
	250