Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 1.3 2004/09/16 23:27:13 gleixner Exp $ |
| 9 | */ |
| 10 | |
| 11 | #include <linux/config.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/kernel.h> |
| 15 | |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/init.h> |
| 18 | |
| 19 | #include <linux/mtd/mtd.h> |
| 20 | #include <linux/mtd/map.h> |
| 21 | #include <linux/mtd/partitions.h> |
| 22 | |
| 23 | #include <asm/hardware.h> |
| 24 | #include <asm/io.h> |
| 25 | |
| 26 | |
| 27 | #ifndef CONFIG_ARCH_OMAP |
| 28 | #error This is for OMAP architecture only |
| 29 | #endif |
| 30 | |
| 31 | //these lines need be moved to a hardware header file |
| 32 | #define OMAP_TOTO_FLASH_BASE 0xd8000000 |
| 33 | #define OMAP_TOTO_FLASH_SIZE 0x80000 |
| 34 | |
| 35 | static struct map_info omap_toto_map_flash = { |
| 36 | .name = "OMAP Toto flash", |
| 37 | .bankwidth = 2, |
| 38 | .virt = (void __iomem *)OMAP_TOTO_FLASH_BASE, |
| 39 | }; |
| 40 | |
| 41 | |
| 42 | static struct mtd_partition toto_flash_partitions[] = { |
| 43 | { |
| 44 | .name = "BootLoader", |
| 45 | .size = 0x00040000, /* hopefully u-boot will stay 128k + 128*/ |
| 46 | .offset = 0, |
| 47 | .mask_flags = MTD_WRITEABLE, /* force read-only */ |
| 48 | }, { |
| 49 | .name = "ReservedSpace", |
| 50 | .size = 0x00030000, |
| 51 | .offset = MTDPART_OFS_APPEND, |
| 52 | //mask_flags: MTD_WRITEABLE, /* force read-only */ |
| 53 | }, { |
| 54 | .name = "EnvArea", /* bottom 64KiB for env vars */ |
| 55 | .size = MTDPART_SIZ_FULL, |
| 56 | .offset = MTDPART_OFS_APPEND, |
| 57 | } |
| 58 | }; |
| 59 | |
| 60 | static struct mtd_partition *parsed_parts; |
| 61 | |
| 62 | static struct mtd_info *flash_mtd; |
| 63 | |
| 64 | static int __init init_flash (void) |
| 65 | { |
| 66 | |
| 67 | struct mtd_partition *parts; |
| 68 | int nb_parts = 0; |
| 69 | int parsed_nr_parts = 0; |
| 70 | const char *part_type; |
| 71 | |
| 72 | /* |
| 73 | * Static partition definition selection |
| 74 | */ |
| 75 | part_type = "static"; |
| 76 | |
| 77 | parts = toto_flash_partitions; |
| 78 | nb_parts = ARRAY_SIZE(toto_flash_partitions); |
| 79 | omap_toto_map_flash.size = OMAP_TOTO_FLASH_SIZE; |
| 80 | omap_toto_map_flash.phys = virt_to_phys(OMAP_TOTO_FLASH_BASE); |
| 81 | |
| 82 | simple_map_init(&omap_toto_map_flash); |
| 83 | /* |
| 84 | * Now let's probe for the actual flash. Do it here since |
| 85 | * specific machine settings might have been set above. |
| 86 | */ |
| 87 | printk(KERN_NOTICE "OMAP toto flash: probing %d-bit flash bus\n", |
| 88 | omap_toto_map_flash.bankwidth*8); |
| 89 | flash_mtd = do_map_probe("jedec_probe", &omap_toto_map_flash); |
| 90 | if (!flash_mtd) |
| 91 | return -ENXIO; |
| 92 | |
| 93 | if (parsed_nr_parts > 0) { |
| 94 | parts = parsed_parts; |
| 95 | nb_parts = parsed_nr_parts; |
| 96 | } |
| 97 | |
| 98 | if (nb_parts == 0) { |
| 99 | printk(KERN_NOTICE "OMAP toto flash: no partition info available," |
| 100 | "registering whole flash at once\n"); |
| 101 | if (add_mtd_device(flash_mtd)){ |
| 102 | return -ENXIO; |
| 103 | } |
| 104 | } else { |
| 105 | printk(KERN_NOTICE "Using %s partition definition\n", |
| 106 | part_type); |
| 107 | return add_mtd_partitions(flash_mtd, parts, nb_parts); |
| 108 | } |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | int __init omap_toto_mtd_init(void) |
| 113 | { |
| 114 | int status; |
| 115 | |
| 116 | if (status = init_flash()) { |
| 117 | printk(KERN_ERR "OMAP Toto Flash: unable to init map for toto flash\n"); |
| 118 | } |
| 119 | return status; |
| 120 | } |
| 121 | |
| 122 | static void __exit omap_toto_mtd_cleanup(void) |
| 123 | { |
| 124 | if (flash_mtd) { |
| 125 | del_mtd_partitions(flash_mtd); |
| 126 | map_destroy(flash_mtd); |
| 127 | if (parsed_parts) |
| 128 | kfree(parsed_parts); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | module_init(omap_toto_mtd_init); |
| 133 | module_exit(omap_toto_mtd_cleanup); |
| 134 | |
| 135 | MODULE_AUTHOR("Jian Zhang"); |
| 136 | MODULE_DESCRIPTION("OMAP Toto board map driver"); |
| 137 | MODULE_LICENSE("GPL"); |