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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Thomas Gleixner69f34c92005-11-07 11:15:40 +00008 * $Id: omap-toto-flash.c,v 1.5 2005/11/07 11:14:27 gleixner Exp $
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 */
10
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/errno.h>
15#include <linux/init.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080016#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
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
Thomas Gleixner69f34c92005-11-07 11:15:40 +000040
Linus Torvalds1da177e2005-04-16 15:20:36 -070041static 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,
Thomas Gleixner69f34c92005-11-07 11:15:40 +000056 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070057};
58
59static struct mtd_partition *parsed_parts;
60
61static struct mtd_info *flash_mtd;
Thomas Gleixner69f34c92005-11-07 11:15:40 +000062
63static int __init init_flash (void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
65
66 struct mtd_partition *parts;
67 int nb_parts = 0;
68 int parsed_nr_parts = 0;
69 const char *part_type;
Thomas Gleixner69f34c92005-11-07 11:15:40 +000070
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 /*
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;
Thomas Gleixner69f34c92005-11-07 11:15:40 +000091
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 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}
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000110
111int __init omap_toto_mtd_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112{
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
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000121static void __exit omap_toto_mtd_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
123 if (flash_mtd) {
124 del_mtd_partitions(flash_mtd);
125 map_destroy(flash_mtd);
Jesper Juhlfa671642005-11-07 01:01:27 -0800126 kfree(parsed_parts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 }
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");