Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Flash memory access on SA11x0 based devices |
| 3 | * |
| 4 | * (C) 2000 Nicolas Pitre <nico@cam.org> |
| 5 | * |
| 6 | * $Id: sa1100-flash.c,v 1.47 2004/11/01 13:44:36 rmk Exp $ |
| 7 | */ |
| 8 | #include <linux/config.h> |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/ioport.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/errno.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/err.h> |
| 18 | |
| 19 | #include <linux/mtd/mtd.h> |
| 20 | #include <linux/mtd/map.h> |
| 21 | #include <linux/mtd/partitions.h> |
| 22 | #include <linux/mtd/concat.h> |
| 23 | |
Russell King | 674c045 | 2005-10-28 14:25:28 +0100 | [diff] [blame] | 24 | #include <asm/hardware.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <asm/io.h> |
| 26 | #include <asm/sizes.h> |
| 27 | #include <asm/mach/flash.h> |
| 28 | |
| 29 | #if 0 |
| 30 | /* |
| 31 | * This is here for documentation purposes only - until these people |
| 32 | * submit their machine types. It will be gone January 2005. |
| 33 | */ |
| 34 | static struct mtd_partition consus_partitions[] = { |
| 35 | { |
| 36 | .name = "Consus boot firmware", |
| 37 | .offset = 0, |
| 38 | .size = 0x00040000, |
| 39 | .mask_flags = MTD_WRITABLE, /* force read-only */ |
| 40 | }, { |
| 41 | .name = "Consus kernel", |
| 42 | .offset = 0x00040000, |
| 43 | .size = 0x00100000, |
| 44 | .mask_flags = 0, |
| 45 | }, { |
| 46 | .name = "Consus disk", |
| 47 | .offset = 0x00140000, |
| 48 | /* The rest (up to 16M) for jffs. We could put 0 and |
| 49 | make it find the size automatically, but right now |
| 50 | i have 32 megs. jffs will use all 32 megs if given |
| 51 | the chance, and this leads to horrible problems |
| 52 | when you try to re-flash the image because blob |
| 53 | won't erase the whole partition. */ |
| 54 | .size = 0x01000000 - 0x00140000, |
| 55 | .mask_flags = 0, |
| 56 | }, { |
| 57 | /* this disk is a secondary disk, which can be used as |
| 58 | needed, for simplicity, make it the size of the other |
| 59 | consus partition, although realistically it could be |
| 60 | the remainder of the disk (depending on the file |
| 61 | system used) */ |
| 62 | .name = "Consus disk2", |
| 63 | .offset = 0x01000000, |
| 64 | .size = 0x01000000 - 0x00140000, |
| 65 | .mask_flags = 0, |
| 66 | } |
| 67 | }; |
| 68 | |
| 69 | /* Frodo has 2 x 16M 28F128J3A flash chips in bank 0: */ |
| 70 | static struct mtd_partition frodo_partitions[] = |
| 71 | { |
| 72 | { |
| 73 | .name = "bootloader", |
| 74 | .size = 0x00040000, |
| 75 | .offset = 0x00000000, |
| 76 | .mask_flags = MTD_WRITEABLE |
| 77 | }, { |
| 78 | .name = "bootloader params", |
| 79 | .size = 0x00040000, |
| 80 | .offset = MTDPART_OFS_APPEND, |
| 81 | .mask_flags = MTD_WRITEABLE |
| 82 | }, { |
| 83 | .name = "kernel", |
| 84 | .size = 0x00100000, |
| 85 | .offset = MTDPART_OFS_APPEND, |
| 86 | .mask_flags = MTD_WRITEABLE |
| 87 | }, { |
| 88 | .name = "ramdisk", |
| 89 | .size = 0x00400000, |
| 90 | .offset = MTDPART_OFS_APPEND, |
| 91 | .mask_flags = MTD_WRITEABLE |
| 92 | }, { |
| 93 | .name = "file system", |
| 94 | .size = MTDPART_SIZ_FULL, |
| 95 | .offset = MTDPART_OFS_APPEND |
| 96 | } |
| 97 | }; |
| 98 | |
| 99 | static struct mtd_partition jornada56x_partitions[] = { |
| 100 | { |
| 101 | .name = "bootldr", |
| 102 | .size = 0x00040000, |
| 103 | .offset = 0, |
| 104 | .mask_flags = MTD_WRITEABLE, |
| 105 | }, { |
| 106 | .name = "rootfs", |
| 107 | .size = MTDPART_SIZ_FULL, |
| 108 | .offset = MTDPART_OFS_APPEND, |
| 109 | } |
| 110 | }; |
| 111 | |
| 112 | static void jornada56x_set_vpp(int vpp) |
| 113 | { |
| 114 | if (vpp) |
| 115 | GPSR = GPIO_GPIO26; |
| 116 | else |
| 117 | GPCR = GPIO_GPIO26; |
| 118 | GPDR |= GPIO_GPIO26; |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Machine Phys Size set_vpp |
| 123 | * Consus : SA1100_CS0_PHYS SZ_32M |
| 124 | * Frodo : SA1100_CS0_PHYS SZ_32M |
| 125 | * Jornada56x: SA1100_CS0_PHYS SZ_32M jornada56x_set_vpp |
| 126 | */ |
| 127 | #endif |
| 128 | |
| 129 | struct sa_subdev_info { |
| 130 | char name[16]; |
| 131 | struct map_info map; |
| 132 | struct mtd_info *mtd; |
Russell King | 57725f0 | 2005-10-29 15:51:14 +0100 | [diff] [blame] | 133 | struct flash_platform_data *plat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | }; |
| 135 | |
| 136 | struct sa_info { |
| 137 | struct mtd_partition *parts; |
| 138 | struct mtd_info *mtd; |
| 139 | int num_subdev; |
Russell King | 822e5e7 | 2005-10-29 16:03:24 +0100 | [diff] [blame] | 140 | unsigned int nr_parts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | struct sa_subdev_info subdev[0]; |
| 142 | }; |
| 143 | |
| 144 | static void sa1100_set_vpp(struct map_info *map, int on) |
| 145 | { |
| 146 | struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map); |
Russell King | 57725f0 | 2005-10-29 15:51:14 +0100 | [diff] [blame] | 147 | subdev->plat->set_vpp(on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | static void sa1100_destroy_subdev(struct sa_subdev_info *subdev) |
| 151 | { |
| 152 | if (subdev->mtd) |
| 153 | map_destroy(subdev->mtd); |
| 154 | if (subdev->map.virt) |
| 155 | iounmap(subdev->map.virt); |
| 156 | release_mem_region(subdev->map.phys, subdev->map.size); |
| 157 | } |
| 158 | |
| 159 | static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res) |
| 160 | { |
| 161 | unsigned long phys; |
| 162 | unsigned int size; |
| 163 | int ret; |
| 164 | |
| 165 | phys = res->start; |
| 166 | size = res->end - phys + 1; |
| 167 | |
| 168 | /* |
| 169 | * Retrieve the bankwidth from the MSC registers. |
| 170 | * We currently only implement CS0 and CS1 here. |
| 171 | */ |
| 172 | switch (phys) { |
| 173 | default: |
| 174 | printk(KERN_WARNING "SA1100 flash: unknown base address " |
| 175 | "0x%08lx, assuming CS0\n", phys); |
| 176 | |
| 177 | case SA1100_CS0_PHYS: |
| 178 | subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4; |
| 179 | break; |
| 180 | |
| 181 | case SA1100_CS1_PHYS: |
| 182 | subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4; |
| 183 | break; |
| 184 | } |
| 185 | |
| 186 | if (!request_mem_region(phys, size, subdev->name)) { |
| 187 | ret = -EBUSY; |
| 188 | goto out; |
| 189 | } |
| 190 | |
Russell King | 57725f0 | 2005-10-29 15:51:14 +0100 | [diff] [blame] | 191 | if (subdev->plat->set_vpp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | subdev->map.set_vpp = sa1100_set_vpp; |
| 193 | |
| 194 | subdev->map.phys = phys; |
| 195 | subdev->map.size = size; |
| 196 | subdev->map.virt = ioremap(phys, size); |
| 197 | if (!subdev->map.virt) { |
| 198 | ret = -ENOMEM; |
| 199 | goto err; |
| 200 | } |
| 201 | |
| 202 | simple_map_init(&subdev->map); |
| 203 | |
| 204 | /* |
| 205 | * Now let's probe for the actual flash. Do it here since |
| 206 | * specific machine settings might have been set above. |
| 207 | */ |
Russell King | 57725f0 | 2005-10-29 15:51:14 +0100 | [diff] [blame] | 208 | subdev->mtd = do_map_probe(subdev->plat->map_name, &subdev->map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | if (subdev->mtd == NULL) { |
| 210 | ret = -ENXIO; |
| 211 | goto err; |
| 212 | } |
| 213 | subdev->mtd->owner = THIS_MODULE; |
| 214 | |
| 215 | printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %dMiB, " |
| 216 | "%d-bit\n", phys, subdev->mtd->size >> 20, |
| 217 | subdev->map.bankwidth * 8); |
| 218 | |
| 219 | return 0; |
| 220 | |
| 221 | err: |
| 222 | sa1100_destroy_subdev(subdev); |
| 223 | out: |
| 224 | return ret; |
| 225 | } |
| 226 | |
Russell King | 0d2ef7d | 2005-10-29 15:57:20 +0100 | [diff] [blame] | 227 | static void sa1100_destroy(struct sa_info *info, struct flash_platform_data *plat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | { |
| 229 | int i; |
| 230 | |
| 231 | if (info->mtd) { |
Russell King | 822e5e7 | 2005-10-29 16:03:24 +0100 | [diff] [blame] | 232 | if (info->nr_parts == 0) |
| 233 | del_mtd_device(info->mtd); |
| 234 | #ifdef CONFIG_MTD_PARTITIONS |
| 235 | else |
| 236 | del_mtd_partitions(info->mtd); |
| 237 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | #ifdef CONFIG_MTD_CONCAT |
| 239 | if (info->mtd != info->subdev[0].mtd) |
| 240 | mtd_concat_destroy(info->mtd); |
| 241 | #endif |
| 242 | } |
| 243 | |
| 244 | if (info->parts) |
| 245 | kfree(info->parts); |
| 246 | |
| 247 | for (i = info->num_subdev - 1; i >= 0; i--) |
| 248 | sa1100_destroy_subdev(&info->subdev[i]); |
| 249 | kfree(info); |
Russell King | 0d2ef7d | 2005-10-29 15:57:20 +0100 | [diff] [blame] | 250 | |
| 251 | if (plat->exit) |
| 252 | plat->exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | static struct sa_info *__init |
Russell King | 57725f0 | 2005-10-29 15:51:14 +0100 | [diff] [blame] | 256 | sa1100_setup_mtd(struct platform_device *pdev, struct flash_platform_data *plat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | { |
| 258 | struct sa_info *info; |
| 259 | int nr, size, i, ret = 0; |
| 260 | |
| 261 | /* |
| 262 | * Count number of devices. |
| 263 | */ |
| 264 | for (nr = 0; ; nr++) |
| 265 | if (!platform_get_resource(pdev, IORESOURCE_MEM, nr)) |
| 266 | break; |
| 267 | |
| 268 | if (nr == 0) { |
| 269 | ret = -ENODEV; |
| 270 | goto out; |
| 271 | } |
| 272 | |
| 273 | size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr; |
| 274 | |
| 275 | /* |
| 276 | * Allocate the map_info structs in one go. |
| 277 | */ |
| 278 | info = kmalloc(size, GFP_KERNEL); |
| 279 | if (!info) { |
| 280 | ret = -ENOMEM; |
| 281 | goto out; |
| 282 | } |
| 283 | |
| 284 | memset(info, 0, size); |
| 285 | |
Russell King | 0d2ef7d | 2005-10-29 15:57:20 +0100 | [diff] [blame] | 286 | if (plat->init) { |
| 287 | ret = plat->init(); |
| 288 | if (ret) |
| 289 | goto err; |
| 290 | } |
| 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | /* |
| 293 | * Claim and then map the memory regions. |
| 294 | */ |
| 295 | for (i = 0; i < nr; i++) { |
| 296 | struct sa_subdev_info *subdev = &info->subdev[i]; |
| 297 | struct resource *res; |
| 298 | |
| 299 | res = platform_get_resource(pdev, IORESOURCE_MEM, i); |
| 300 | if (!res) |
| 301 | break; |
| 302 | |
| 303 | subdev->map.name = subdev->name; |
Russell King | 14e66f7 | 2005-10-29 16:08:31 +0100 | [diff] [blame] | 304 | sprintf(subdev->name, "%s-%d", plat->name, i); |
Russell King | 57725f0 | 2005-10-29 15:51:14 +0100 | [diff] [blame] | 305 | subdev->plat = plat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
| 307 | ret = sa1100_probe_subdev(subdev, res); |
| 308 | if (ret) |
| 309 | break; |
| 310 | } |
| 311 | |
| 312 | info->num_subdev = i; |
| 313 | |
| 314 | /* |
| 315 | * ENXIO is special. It means we didn't find a chip when we probed. |
| 316 | */ |
| 317 | if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0)) |
| 318 | goto err; |
| 319 | |
| 320 | /* |
| 321 | * If we found one device, don't bother with concat support. If |
| 322 | * we found multiple devices, use concat if we have it available, |
| 323 | * otherwise fail. Either way, it'll be called "sa1100". |
| 324 | */ |
| 325 | if (info->num_subdev == 1) { |
Russell King | 14e66f7 | 2005-10-29 16:08:31 +0100 | [diff] [blame] | 326 | strcpy(info->subdev[0].name, plat->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | info->mtd = info->subdev[0].mtd; |
| 328 | ret = 0; |
| 329 | } else if (info->num_subdev > 1) { |
| 330 | #ifdef CONFIG_MTD_CONCAT |
| 331 | struct mtd_info *cdev[nr]; |
| 332 | /* |
| 333 | * We detected multiple devices. Concatenate them together. |
| 334 | */ |
| 335 | for (i = 0; i < info->num_subdev; i++) |
| 336 | cdev[i] = info->subdev[i].mtd; |
| 337 | |
| 338 | info->mtd = mtd_concat_create(cdev, info->num_subdev, |
Russell King | 14e66f7 | 2005-10-29 16:08:31 +0100 | [diff] [blame] | 339 | plat->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | if (info->mtd == NULL) |
| 341 | ret = -ENXIO; |
| 342 | #else |
| 343 | printk(KERN_ERR "SA1100 flash: multiple devices " |
| 344 | "found but MTD concat support disabled.\n"); |
| 345 | ret = -ENXIO; |
| 346 | #endif |
| 347 | } |
| 348 | |
| 349 | if (ret == 0) |
| 350 | return info; |
| 351 | |
| 352 | err: |
Russell King | 0d2ef7d | 2005-10-29 15:57:20 +0100 | [diff] [blame] | 353 | sa1100_destroy(info, plat); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | out: |
| 355 | return ERR_PTR(ret); |
| 356 | } |
| 357 | |
| 358 | static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL }; |
| 359 | |
| 360 | static int __init sa1100_mtd_probe(struct device *dev) |
| 361 | { |
| 362 | struct platform_device *pdev = to_platform_device(dev); |
Russell King | 57725f0 | 2005-10-29 15:51:14 +0100 | [diff] [blame] | 363 | struct flash_platform_data *plat = pdev->dev.platform_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | struct mtd_partition *parts; |
| 365 | const char *part_type = NULL; |
| 366 | struct sa_info *info; |
| 367 | int err, nr_parts = 0; |
| 368 | |
Russell King | 57725f0 | 2005-10-29 15:51:14 +0100 | [diff] [blame] | 369 | if (!plat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | return -ENODEV; |
| 371 | |
Russell King | 57725f0 | 2005-10-29 15:51:14 +0100 | [diff] [blame] | 372 | info = sa1100_setup_mtd(pdev, plat); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | if (IS_ERR(info)) { |
| 374 | err = PTR_ERR(info); |
| 375 | goto out; |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | * Partition selection stuff. |
| 380 | */ |
| 381 | #ifdef CONFIG_MTD_PARTITIONS |
| 382 | nr_parts = parse_mtd_partitions(info->mtd, part_probes, &parts, 0); |
| 383 | if (nr_parts > 0) { |
| 384 | info->parts = parts; |
| 385 | part_type = "dynamic"; |
| 386 | } else |
| 387 | #endif |
| 388 | { |
Russell King | 57725f0 | 2005-10-29 15:51:14 +0100 | [diff] [blame] | 389 | parts = plat->parts; |
| 390 | nr_parts = plat->nr_parts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | part_type = "static"; |
| 392 | } |
| 393 | |
| 394 | if (nr_parts == 0) { |
| 395 | printk(KERN_NOTICE "SA1100 flash: no partition info " |
| 396 | "available, registering whole flash\n"); |
| 397 | add_mtd_device(info->mtd); |
| 398 | } else { |
| 399 | printk(KERN_NOTICE "SA1100 flash: using %s partition " |
| 400 | "definition\n", part_type); |
| 401 | add_mtd_partitions(info->mtd, parts, nr_parts); |
| 402 | } |
| 403 | |
Russell King | 822e5e7 | 2005-10-29 16:03:24 +0100 | [diff] [blame] | 404 | info->nr_parts = nr_parts; |
| 405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | dev_set_drvdata(dev, info); |
| 407 | err = 0; |
| 408 | |
| 409 | out: |
| 410 | return err; |
| 411 | } |
| 412 | |
| 413 | static int __exit sa1100_mtd_remove(struct device *dev) |
| 414 | { |
| 415 | struct sa_info *info = dev_get_drvdata(dev); |
Russell King | 0d2ef7d | 2005-10-29 15:57:20 +0100 | [diff] [blame] | 416 | struct flash_platform_data *plat = dev->platform_data; |
| 417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | dev_set_drvdata(dev, NULL); |
Russell King | 0d2ef7d | 2005-10-29 15:57:20 +0100 | [diff] [blame] | 419 | sa1100_destroy(info, plat); |
| 420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | #ifdef CONFIG_PM |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 425 | static int sa1100_mtd_suspend(struct device *dev, pm_message_t state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | { |
| 427 | struct sa_info *info = dev_get_drvdata(dev); |
| 428 | int ret = 0; |
| 429 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 430 | if (info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | ret = info->mtd->suspend(info->mtd); |
| 432 | |
| 433 | return ret; |
| 434 | } |
| 435 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 436 | static int sa1100_mtd_resume(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | { |
| 438 | struct sa_info *info = dev_get_drvdata(dev); |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 439 | if (info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | info->mtd->resume(info->mtd); |
| 441 | return 0; |
| 442 | } |
| 443 | #else |
| 444 | #define sa1100_mtd_suspend NULL |
| 445 | #define sa1100_mtd_resume NULL |
| 446 | #endif |
| 447 | |
| 448 | static struct device_driver sa1100_mtd_driver = { |
| 449 | .name = "flash", |
| 450 | .bus = &platform_bus_type, |
| 451 | .probe = sa1100_mtd_probe, |
| 452 | .remove = __exit_p(sa1100_mtd_remove), |
| 453 | .suspend = sa1100_mtd_suspend, |
| 454 | .resume = sa1100_mtd_resume, |
| 455 | }; |
| 456 | |
| 457 | static int __init sa1100_mtd_init(void) |
| 458 | { |
| 459 | return driver_register(&sa1100_mtd_driver); |
| 460 | } |
| 461 | |
| 462 | static void __exit sa1100_mtd_exit(void) |
| 463 | { |
| 464 | driver_unregister(&sa1100_mtd_driver); |
| 465 | } |
| 466 | |
| 467 | module_init(sa1100_mtd_init); |
| 468 | module_exit(sa1100_mtd_exit); |
| 469 | |
| 470 | MODULE_AUTHOR("Nicolas Pitre"); |
| 471 | MODULE_DESCRIPTION("SA1100 CFI map driver"); |
| 472 | MODULE_LICENSE("GPL"); |