1/*
2 * NOR Flash memory access on TI Toto board
3 *
4 * jzhang@ti.com (C) 2003 Texas Instruments.
5 *
6 *  (C) 2002 MontVista Software, Inc.
7 *
8 * $Id: omap-toto-flash.c,v 1.1.1.1 2007/08/03 18:52:44 Exp $
9 */
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17
18#include <linux/mtd/mtd.h>
19#include <linux/mtd/map.h>
20#include <linux/mtd/partitions.h>
21
22#include <asm/hardware.h>
23#include <asm/io.h>
24
25
26#ifndef CONFIG_ARCH_OMAP
27#error This is for OMAP architecture only
28#endif
29
30//these lines need be moved to a hardware header file
31#define OMAP_TOTO_FLASH_BASE 0xd8000000
32#define OMAP_TOTO_FLASH_SIZE 0x80000
33
34static struct map_info omap_toto_map_flash = {
35	.name =		"OMAP Toto flash",
36	.bankwidth =	2,
37	.virt =		(void __iomem *)OMAP_TOTO_FLASH_BASE,
38};
39
40
41static struct mtd_partition toto_flash_partitions[] = {
42	{
43		.name =		"BootLoader",
44		.size =		0x00040000,     /* hopefully u-boot will stay 128k + 128*/
45		.offset =	0,
46		.mask_flags =	MTD_WRITEABLE,  /* force read-only */
47	}, {
48		.name =		"ReservedSpace",
49		.size =		0x00030000,
50		.offset =	MTDPART_OFS_APPEND,
51		//mask_flags:	MTD_WRITEABLE,  /* force read-only */
52	}, {
53		.name =		"EnvArea",      /* bottom 64KiB for env vars */
54		.size =		MTDPART_SIZ_FULL,
55		.offset =	MTDPART_OFS_APPEND,
56	}
57};
58
59static struct mtd_partition *parsed_parts;
60
61static struct mtd_info *flash_mtd;
62
63static int __init init_flash (void)
64{
65
66	struct mtd_partition *parts;
67	int nb_parts = 0;
68	int parsed_nr_parts = 0;
69	const char *part_type;
70
71	/*
72	 * Static partition definition selection
73	 */
74	part_type = "static";
75
76 	parts = toto_flash_partitions;
77	nb_parts = ARRAY_SIZE(toto_flash_partitions);
78	omap_toto_map_flash.size = OMAP_TOTO_FLASH_SIZE;
79	omap_toto_map_flash.phys = virt_to_phys(OMAP_TOTO_FLASH_BASE);
80
81	simple_map_init(&omap_toto_map_flash);
82	/*
83	 * Now let's probe for the actual flash.  Do it here since
84	 * specific machine settings might have been set above.
85	 */
86	printk(KERN_NOTICE "OMAP toto flash: probing %d-bit flash bus\n",
87		omap_toto_map_flash.bankwidth*8);
88	flash_mtd = do_map_probe("jedec_probe", &omap_toto_map_flash);
89	if (!flash_mtd)
90		return -ENXIO;
91
92 	if (parsed_nr_parts > 0) {
93		parts = parsed_parts;
94		nb_parts = parsed_nr_parts;
95	}
96
97	if (nb_parts == 0) {
98		printk(KERN_NOTICE "OMAP toto flash: no partition info available,"
99			"registering whole flash at once\n");
100		if (add_mtd_device(flash_mtd)){
101            return -ENXIO;
102        }
103	} else {
104		printk(KERN_NOTICE "Using %s partition definition\n",
105			part_type);
106		return add_mtd_partitions(flash_mtd, parts, nb_parts);
107	}
108	return 0;
109}
110
111int __init omap_toto_mtd_init(void)
112{
113	int status;
114
115 	if (status = init_flash()) {
116		printk(KERN_ERR "OMAP Toto Flash: unable to init map for toto flash\n");
117	}
118    return status;
119}
120
121static void  __exit omap_toto_mtd_cleanup(void)
122{
123	if (flash_mtd) {
124		del_mtd_partitions(flash_mtd);
125		map_destroy(flash_mtd);
126		kfree(parsed_parts);
127	}
128}
129
130module_init(omap_toto_mtd_init);
131module_exit(omap_toto_mtd_cleanup);
132
133MODULE_AUTHOR("Jian Zhang");
134MODULE_DESCRIPTION("OMAP Toto board map driver");
135MODULE_LICENSE("GPL");
136