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 1.5 2005/11/07 11:14:27 gleixner 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
34 static 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
41 static 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
59 static struct mtd_partition *parsed_parts;
60
61 static struct mtd_info *flash_mtd;
62
63 static 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
111 int __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
121 static 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
130 module_init(omap_toto_mtd_init);
131 module_exit(omap_toto_mtd_cleanup);
132
133 MODULE_AUTHOR("Jian Zhang");
134 MODULE_DESCRIPTION("OMAP Toto board map driver");
135 MODULE_LICENSE("GPL");
136
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