Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Common Flash Interface support: |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3 | * Generic utility functions not dependent on command set |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Copyright (C) 2002 Red Hat |
| 6 | * Copyright (C) 2003 STMicroelectronics Limited |
| 7 | * |
| 8 | * This code is covered by the GPL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <asm/io.h> |
| 15 | #include <asm/byteorder.h> |
| 16 | |
| 17 | #include <linux/errno.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/mtd/xip.h> |
| 22 | #include <linux/mtd/mtd.h> |
| 23 | #include <linux/mtd/map.h> |
| 24 | #include <linux/mtd/cfi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
Denys Vlasenko | 4612c71 | 2015-05-18 12:58:40 +0200 | [diff] [blame^] | 26 | void cfi_udelay(int us) |
| 27 | { |
| 28 | if (us >= 1000) { |
| 29 | msleep((us+999)/1000); |
| 30 | } else { |
| 31 | udelay(us); |
| 32 | cond_resched(); |
| 33 | } |
| 34 | } |
| 35 | EXPORT_SYMBOL(cfi_udelay); |
| 36 | |
| 37 | /* |
| 38 | * Returns the command address according to the given geometry. |
| 39 | */ |
| 40 | uint32_t cfi_build_cmd_addr(uint32_t cmd_ofs, |
| 41 | struct map_info *map, struct cfi_private *cfi) |
| 42 | { |
| 43 | unsigned bankwidth = map_bankwidth(map); |
| 44 | unsigned interleave = cfi_interleave(cfi); |
| 45 | unsigned type = cfi->device_type; |
| 46 | uint32_t addr; |
| 47 | |
| 48 | addr = (cmd_ofs * type) * interleave; |
| 49 | |
| 50 | /* Modify the unlock address if we are in compatibility mode. |
| 51 | * For 16bit devices on 8 bit busses |
| 52 | * and 32bit devices on 16 bit busses |
| 53 | * set the low bit of the alternating bit sequence of the address. |
| 54 | */ |
| 55 | if (((type * interleave) > bankwidth) && ((cmd_ofs & 0xff) == 0xaa)) |
| 56 | addr |= (type >> 1)*interleave; |
| 57 | |
| 58 | return addr; |
| 59 | } |
| 60 | EXPORT_SYMBOL(cfi_build_cmd_addr); |
| 61 | |
| 62 | /* |
| 63 | * Transforms the CFI command for the given geometry (bus width & interleave). |
| 64 | * It looks too long to be inline, but in the common case it should almost all |
| 65 | * get optimised away. |
| 66 | */ |
| 67 | map_word cfi_build_cmd(u_long cmd, struct map_info *map, struct cfi_private *cfi) |
| 68 | { |
| 69 | map_word val = { {0} }; |
| 70 | int wordwidth, words_per_bus, chip_mode, chips_per_word; |
| 71 | unsigned long onecmd; |
| 72 | int i; |
| 73 | |
| 74 | /* We do it this way to give the compiler a fighting chance |
| 75 | of optimising away all the crap for 'bankwidth' larger than |
| 76 | an unsigned long, in the common case where that support is |
| 77 | disabled */ |
| 78 | if (map_bankwidth_is_large(map)) { |
| 79 | wordwidth = sizeof(unsigned long); |
| 80 | words_per_bus = (map_bankwidth(map)) / wordwidth; // i.e. normally 1 |
| 81 | } else { |
| 82 | wordwidth = map_bankwidth(map); |
| 83 | words_per_bus = 1; |
| 84 | } |
| 85 | |
| 86 | chip_mode = map_bankwidth(map) / cfi_interleave(cfi); |
| 87 | chips_per_word = wordwidth * cfi_interleave(cfi) / map_bankwidth(map); |
| 88 | |
| 89 | /* First, determine what the bit-pattern should be for a single |
| 90 | device, according to chip mode and endianness... */ |
| 91 | switch (chip_mode) { |
| 92 | default: BUG(); |
| 93 | case 1: |
| 94 | onecmd = cmd; |
| 95 | break; |
| 96 | case 2: |
| 97 | onecmd = cpu_to_cfi16(map, cmd); |
| 98 | break; |
| 99 | case 4: |
| 100 | onecmd = cpu_to_cfi32(map, cmd); |
| 101 | break; |
| 102 | } |
| 103 | |
| 104 | /* Now replicate it across the size of an unsigned long, or |
| 105 | just to the bus width as appropriate */ |
| 106 | switch (chips_per_word) { |
| 107 | default: BUG(); |
| 108 | #if BITS_PER_LONG >= 64 |
| 109 | case 8: |
| 110 | onecmd |= (onecmd << (chip_mode * 32)); |
| 111 | #endif |
| 112 | case 4: |
| 113 | onecmd |= (onecmd << (chip_mode * 16)); |
| 114 | case 2: |
| 115 | onecmd |= (onecmd << (chip_mode * 8)); |
| 116 | case 1: |
| 117 | ; |
| 118 | } |
| 119 | |
| 120 | /* And finally, for the multi-word case, replicate it |
| 121 | in all words in the structure */ |
| 122 | for (i=0; i < words_per_bus; i++) { |
| 123 | val.x[i] = onecmd; |
| 124 | } |
| 125 | |
| 126 | return val; |
| 127 | } |
| 128 | EXPORT_SYMBOL(cfi_build_cmd); |
| 129 | |
| 130 | unsigned long cfi_merge_status(map_word val, struct map_info *map, |
| 131 | struct cfi_private *cfi) |
| 132 | { |
| 133 | int wordwidth, words_per_bus, chip_mode, chips_per_word; |
| 134 | unsigned long onestat, res = 0; |
| 135 | int i; |
| 136 | |
| 137 | /* We do it this way to give the compiler a fighting chance |
| 138 | of optimising away all the crap for 'bankwidth' larger than |
| 139 | an unsigned long, in the common case where that support is |
| 140 | disabled */ |
| 141 | if (map_bankwidth_is_large(map)) { |
| 142 | wordwidth = sizeof(unsigned long); |
| 143 | words_per_bus = (map_bankwidth(map)) / wordwidth; // i.e. normally 1 |
| 144 | } else { |
| 145 | wordwidth = map_bankwidth(map); |
| 146 | words_per_bus = 1; |
| 147 | } |
| 148 | |
| 149 | chip_mode = map_bankwidth(map) / cfi_interleave(cfi); |
| 150 | chips_per_word = wordwidth * cfi_interleave(cfi) / map_bankwidth(map); |
| 151 | |
| 152 | onestat = val.x[0]; |
| 153 | /* Or all status words together */ |
| 154 | for (i=1; i < words_per_bus; i++) { |
| 155 | onestat |= val.x[i]; |
| 156 | } |
| 157 | |
| 158 | res = onestat; |
| 159 | switch(chips_per_word) { |
| 160 | default: BUG(); |
| 161 | #if BITS_PER_LONG >= 64 |
| 162 | case 8: |
| 163 | res |= (onestat >> (chip_mode * 32)); |
| 164 | #endif |
| 165 | case 4: |
| 166 | res |= (onestat >> (chip_mode * 16)); |
| 167 | case 2: |
| 168 | res |= (onestat >> (chip_mode * 8)); |
| 169 | case 1: |
| 170 | ; |
| 171 | } |
| 172 | |
| 173 | /* Last, determine what the bit-pattern should be for a single |
| 174 | device, according to chip mode and endianness... */ |
| 175 | switch (chip_mode) { |
| 176 | case 1: |
| 177 | break; |
| 178 | case 2: |
| 179 | res = cfi16_to_cpu(map, res); |
| 180 | break; |
| 181 | case 4: |
| 182 | res = cfi32_to_cpu(map, res); |
| 183 | break; |
| 184 | default: BUG(); |
| 185 | } |
| 186 | return res; |
| 187 | } |
| 188 | EXPORT_SYMBOL(cfi_merge_status); |
| 189 | |
| 190 | /* |
| 191 | * Sends a CFI command to a bank of flash for the given geometry. |
| 192 | * |
| 193 | * Returns the offset in flash where the command was written. |
| 194 | * If prev_val is non-null, it will be set to the value at the command address, |
| 195 | * before the command was written. |
| 196 | */ |
| 197 | uint32_t cfi_send_gen_cmd(u_char cmd, uint32_t cmd_addr, uint32_t base, |
| 198 | struct map_info *map, struct cfi_private *cfi, |
| 199 | int type, map_word *prev_val) |
| 200 | { |
| 201 | map_word val; |
| 202 | uint32_t addr = base + cfi_build_cmd_addr(cmd_addr, map, cfi); |
| 203 | val = cfi_build_cmd(cmd, map, cfi); |
| 204 | |
| 205 | if (prev_val) |
| 206 | *prev_val = map_read(map, addr); |
| 207 | |
| 208 | map_write(map, val, addr); |
| 209 | |
| 210 | return addr - base; |
| 211 | } |
| 212 | EXPORT_SYMBOL(cfi_send_gen_cmd); |
| 213 | |
David Woodhouse | c314dfd | 2008-08-07 11:55:07 +0100 | [diff] [blame] | 214 | int __xipram cfi_qry_present(struct map_info *map, __u32 base, |
| 215 | struct cfi_private *cfi) |
Alexey Korolev | 2e489e0 | 2008-08-05 16:39:42 +0100 | [diff] [blame] | 216 | { |
| 217 | int osf = cfi->interleave * cfi->device_type; /* scale factor */ |
| 218 | map_word val[3]; |
| 219 | map_word qry[3]; |
| 220 | |
| 221 | qry[0] = cfi_build_cmd('Q', map, cfi); |
| 222 | qry[1] = cfi_build_cmd('R', map, cfi); |
| 223 | qry[2] = cfi_build_cmd('Y', map, cfi); |
| 224 | |
| 225 | val[0] = map_read(map, base + osf*0x10); |
| 226 | val[1] = map_read(map, base + osf*0x11); |
| 227 | val[2] = map_read(map, base + osf*0x12); |
| 228 | |
| 229 | if (!map_word_equal(map, qry[0], val[0])) |
| 230 | return 0; |
| 231 | |
| 232 | if (!map_word_equal(map, qry[1], val[1])) |
| 233 | return 0; |
| 234 | |
| 235 | if (!map_word_equal(map, qry[2], val[2])) |
| 236 | return 0; |
| 237 | |
| 238 | return 1; /* "QRY" found */ |
| 239 | } |
David Woodhouse | c314dfd | 2008-08-07 11:55:07 +0100 | [diff] [blame] | 240 | EXPORT_SYMBOL_GPL(cfi_qry_present); |
Alexey Korolev | 2e489e0 | 2008-08-05 16:39:42 +0100 | [diff] [blame] | 241 | |
David Woodhouse | c314dfd | 2008-08-07 11:55:07 +0100 | [diff] [blame] | 242 | int __xipram cfi_qry_mode_on(uint32_t base, struct map_info *map, |
| 243 | struct cfi_private *cfi) |
Alexey Korolev | 2e489e0 | 2008-08-05 16:39:42 +0100 | [diff] [blame] | 244 | { |
| 245 | cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); |
| 246 | cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL); |
David Woodhouse | c314dfd | 2008-08-07 11:55:07 +0100 | [diff] [blame] | 247 | if (cfi_qry_present(map, base, cfi)) |
Alexey Korolev | 2e489e0 | 2008-08-05 16:39:42 +0100 | [diff] [blame] | 248 | return 1; |
| 249 | /* QRY not found probably we deal with some odd CFI chips */ |
| 250 | /* Some revisions of some old Intel chips? */ |
| 251 | cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); |
| 252 | cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL); |
| 253 | cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL); |
David Woodhouse | c314dfd | 2008-08-07 11:55:07 +0100 | [diff] [blame] | 254 | if (cfi_qry_present(map, base, cfi)) |
Alexey Korolev | 2e489e0 | 2008-08-05 16:39:42 +0100 | [diff] [blame] | 255 | return 1; |
| 256 | /* ST M29DW chips */ |
| 257 | cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); |
| 258 | cfi_send_gen_cmd(0x98, 0x555, base, map, cfi, cfi->device_type, NULL); |
David Woodhouse | c314dfd | 2008-08-07 11:55:07 +0100 | [diff] [blame] | 259 | if (cfi_qry_present(map, base, cfi)) |
Alexey Korolev | 2e489e0 | 2008-08-05 16:39:42 +0100 | [diff] [blame] | 260 | return 1; |
Guillaume LECERF | 4a58948 | 2009-11-23 02:10:49 +0100 | [diff] [blame] | 261 | /* some old SST chips, e.g. 39VF160x/39VF320x */ |
| 262 | cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); |
| 263 | cfi_send_gen_cmd(0xAA, 0x5555, base, map, cfi, cfi->device_type, NULL); |
| 264 | cfi_send_gen_cmd(0x55, 0x2AAA, base, map, cfi, cfi->device_type, NULL); |
| 265 | cfi_send_gen_cmd(0x98, 0x5555, base, map, cfi, cfi->device_type, NULL); |
| 266 | if (cfi_qry_present(map, base, cfi)) |
| 267 | return 1; |
Guillaume LECERF | fc61015 | 2010-10-26 10:26:26 +0100 | [diff] [blame] | 268 | /* SST 39VF640xB */ |
| 269 | cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); |
| 270 | cfi_send_gen_cmd(0xAA, 0x555, base, map, cfi, cfi->device_type, NULL); |
| 271 | cfi_send_gen_cmd(0x55, 0x2AA, base, map, cfi, cfi->device_type, NULL); |
| 272 | cfi_send_gen_cmd(0x98, 0x555, base, map, cfi, cfi->device_type, NULL); |
| 273 | if (cfi_qry_present(map, base, cfi)) |
| 274 | return 1; |
Alexey Korolev | 2e489e0 | 2008-08-05 16:39:42 +0100 | [diff] [blame] | 275 | /* QRY not found */ |
| 276 | return 0; |
| 277 | } |
David Woodhouse | c314dfd | 2008-08-07 11:55:07 +0100 | [diff] [blame] | 278 | EXPORT_SYMBOL_GPL(cfi_qry_mode_on); |
| 279 | |
| 280 | void __xipram cfi_qry_mode_off(uint32_t base, struct map_info *map, |
| 281 | struct cfi_private *cfi) |
Alexey Korolev | 2e489e0 | 2008-08-05 16:39:42 +0100 | [diff] [blame] | 282 | { |
| 283 | cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); |
| 284 | cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL); |
Massimo Cirillo | 23af51e | 2009-09-03 16:34:39 +0200 | [diff] [blame] | 285 | /* M29W128G flashes require an additional reset command |
| 286 | when exit qry mode */ |
| 287 | if ((cfi->mfr == CFI_MFR_ST) && (cfi->id == 0x227E || cfi->id == 0x7E)) |
| 288 | cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); |
Alexey Korolev | 2e489e0 | 2008-08-05 16:39:42 +0100 | [diff] [blame] | 289 | } |
David Woodhouse | c314dfd | 2008-08-07 11:55:07 +0100 | [diff] [blame] | 290 | EXPORT_SYMBOL_GPL(cfi_qry_mode_off); |
Alexey Korolev | 2e489e0 | 2008-08-05 16:39:42 +0100 | [diff] [blame] | 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | struct cfi_extquery * |
| 293 | __xipram cfi_read_pri(struct map_info *map, __u16 adr, __u16 size, const char* name) |
| 294 | { |
| 295 | struct cfi_private *cfi = map->fldrv_priv; |
| 296 | __u32 base = 0; // cfi->chips[0].start; |
| 297 | int ofs_factor = cfi->interleave * cfi->device_type; |
| 298 | int i; |
| 299 | struct cfi_extquery *extp = NULL; |
| 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | if (!adr) |
| 302 | goto out; |
| 303 | |
Guillaume LECERF | 087444d | 2010-04-24 17:58:32 +0200 | [diff] [blame] | 304 | printk(KERN_INFO "%s Extended Query Table at 0x%4.4X\n", name, adr); |
| 305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | extp = kmalloc(size, GFP_KERNEL); |
Jingoo Han | 5c8b1fb | 2014-02-06 15:19:35 +0900 | [diff] [blame] | 307 | if (!extp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
| 310 | #ifdef CONFIG_MTD_XIP |
| 311 | local_irq_disable(); |
| 312 | #endif |
| 313 | |
| 314 | /* Switch it into Query Mode */ |
David Woodhouse | c314dfd | 2008-08-07 11:55:07 +0100 | [diff] [blame] | 315 | cfi_qry_mode_on(base, map, cfi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | /* Read in the Extended Query Table */ |
| 317 | for (i=0; i<size; i++) { |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 318 | ((unsigned char *)extp)[i] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | cfi_read_query(map, base+((adr+i)*ofs_factor)); |
| 320 | } |
| 321 | |
| 322 | /* Make sure it returns to read mode */ |
David Woodhouse | c314dfd | 2008-08-07 11:55:07 +0100 | [diff] [blame] | 323 | cfi_qry_mode_off(base, map, cfi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
| 325 | #ifdef CONFIG_MTD_XIP |
| 326 | (void) map_read(map, base); |
Paulius Zaleckas | ca5c23c | 2008-02-27 01:42:39 +0200 | [diff] [blame] | 327 | xip_iprefetch(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | local_irq_enable(); |
| 329 | #endif |
| 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | out: return extp; |
| 332 | } |
| 333 | |
| 334 | EXPORT_SYMBOL(cfi_read_pri); |
| 335 | |
| 336 | void cfi_fixup(struct mtd_info *mtd, struct cfi_fixup *fixups) |
| 337 | { |
| 338 | struct map_info *map = mtd->priv; |
| 339 | struct cfi_private *cfi = map->fldrv_priv; |
| 340 | struct cfi_fixup *f; |
| 341 | |
| 342 | for (f=fixups; f->fixup; f++) { |
| 343 | if (((f->mfr == CFI_MFR_ANY) || (f->mfr == cfi->mfr)) && |
| 344 | ((f->id == CFI_ID_ANY) || (f->id == cfi->id))) { |
Guillaume LECERF | cc31822 | 2010-11-17 12:35:50 +0100 | [diff] [blame] | 345 | f->fixup(mtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | EXPORT_SYMBOL(cfi_fixup); |
| 351 | |
| 352 | int cfi_varsize_frob(struct mtd_info *mtd, varsize_frob_t frob, |
| 353 | loff_t ofs, size_t len, void *thunk) |
| 354 | { |
| 355 | struct map_info *map = mtd->priv; |
| 356 | struct cfi_private *cfi = map->fldrv_priv; |
| 357 | unsigned long adr; |
| 358 | int chipnum, ret = 0; |
| 359 | int i, first; |
| 360 | struct mtd_erase_region_info *regions = mtd->eraseregions; |
| 361 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | /* Check that both start and end of the requested erase are |
| 363 | * aligned with the erasesize at the appropriate addresses. |
| 364 | */ |
| 365 | |
| 366 | i = 0; |
| 367 | |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 368 | /* Skip all erase regions which are ended before the start of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | the requested erase. Actually, to save on the calculations, |
| 370 | we skip to the first erase region which starts after the |
| 371 | start of the requested erase, and then go back one. |
| 372 | */ |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | while (i < mtd->numeraseregions && ofs >= regions[i].offset) |
| 375 | i++; |
| 376 | i--; |
| 377 | |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 378 | /* OK, now i is pointing at the erase region in which this |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | erase request starts. Check the start of the requested |
| 380 | erase range is aligned with the erase size which is in |
| 381 | effect here. |
| 382 | */ |
| 383 | |
| 384 | if (ofs & (regions[i].erasesize-1)) |
| 385 | return -EINVAL; |
| 386 | |
| 387 | /* Remember the erase region we start on */ |
| 388 | first = i; |
| 389 | |
| 390 | /* Next, check that the end of the requested erase is aligned |
| 391 | * with the erase region at that address. |
| 392 | */ |
| 393 | |
| 394 | while (i<mtd->numeraseregions && (ofs + len) >= regions[i].offset) |
| 395 | i++; |
| 396 | |
| 397 | /* As before, drop back one to point at the region in which |
| 398 | the address actually falls |
| 399 | */ |
| 400 | i--; |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | if ((ofs + len) & (regions[i].erasesize-1)) |
| 403 | return -EINVAL; |
| 404 | |
| 405 | chipnum = ofs >> cfi->chipshift; |
| 406 | adr = ofs - (chipnum << cfi->chipshift); |
| 407 | |
| 408 | i=first; |
| 409 | |
| 410 | while(len) { |
| 411 | int size = regions[i].erasesize; |
| 412 | |
| 413 | ret = (*frob)(map, &cfi->chips[chipnum], adr, size, thunk); |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 414 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | if (ret) |
| 416 | return ret; |
| 417 | |
| 418 | adr += size; |
| 419 | ofs += size; |
| 420 | len -= size; |
| 421 | |
| 422 | if (ofs == regions[i].offset + size * regions[i].numblocks) |
| 423 | i++; |
| 424 | |
| 425 | if (adr >> cfi->chipshift) { |
| 426 | adr = 0; |
| 427 | chipnum++; |
Thomas Gleixner | 1f948b4 | 2005-11-07 11:15:37 +0000 | [diff] [blame] | 428 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | if (chipnum >= cfi->numchips) |
Dan Carpenter | 555b8d1 | 2014-05-14 17:19:00 +0300 | [diff] [blame] | 430 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | } |
| 432 | } |
| 433 | |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | EXPORT_SYMBOL(cfi_varsize_frob); |
| 438 | |
| 439 | MODULE_LICENSE("GPL"); |