David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Atmel AT45xxx DataFlash MTD driver for lightweight SPI framework |
| 3 | * |
| 4 | * Largely derived from at91_dataflash.c: |
| 5 | * Copyright (C) 2003-2005 SAN People (Pty) Ltd |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/device.h> |
Matthias Kaehlcke | ec9ce52 | 2007-06-28 22:58:42 +0100 | [diff] [blame] | 17 | #include <linux/mutex.h> |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 18 | #include <linux/err.h> |
| 19 | |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 20 | #include <linux/spi/spi.h> |
| 21 | #include <linux/spi/flash.h> |
| 22 | |
| 23 | #include <linux/mtd/mtd.h> |
| 24 | #include <linux/mtd/partitions.h> |
| 25 | |
| 26 | |
| 27 | /* |
| 28 | * DataFlash is a kind of SPI flash. Most AT45 chips have two buffers in |
| 29 | * each chip, which may be used for double buffered I/O; but this driver |
| 30 | * doesn't (yet) use these for any kind of i/o overlap or prefetching. |
| 31 | * |
| 32 | * Sometimes DataFlash is packaged in MMC-format cards, although the |
| 33 | * MMC stack can't use SPI (yet), or distinguish between MMC and DataFlash |
| 34 | * protocols during enumeration. |
| 35 | */ |
| 36 | |
| 37 | #define CONFIG_DATAFLASH_WRITE_VERIFY |
| 38 | |
| 39 | /* reads can bypass the buffers */ |
| 40 | #define OP_READ_CONTINUOUS 0xE8 |
| 41 | #define OP_READ_PAGE 0xD2 |
| 42 | |
| 43 | /* group B requests can run even while status reports "busy" */ |
| 44 | #define OP_READ_STATUS 0xD7 /* group B */ |
| 45 | |
| 46 | /* move data between host and buffer */ |
| 47 | #define OP_READ_BUFFER1 0xD4 /* group B */ |
| 48 | #define OP_READ_BUFFER2 0xD6 /* group B */ |
| 49 | #define OP_WRITE_BUFFER1 0x84 /* group B */ |
| 50 | #define OP_WRITE_BUFFER2 0x87 /* group B */ |
| 51 | |
| 52 | /* erasing flash */ |
| 53 | #define OP_ERASE_PAGE 0x81 |
| 54 | #define OP_ERASE_BLOCK 0x50 |
| 55 | |
| 56 | /* move data between buffer and flash */ |
| 57 | #define OP_TRANSFER_BUF1 0x53 |
| 58 | #define OP_TRANSFER_BUF2 0x55 |
| 59 | #define OP_MREAD_BUFFER1 0xD4 |
| 60 | #define OP_MREAD_BUFFER2 0xD6 |
| 61 | #define OP_MWERASE_BUFFER1 0x83 |
| 62 | #define OP_MWERASE_BUFFER2 0x86 |
| 63 | #define OP_MWRITE_BUFFER1 0x88 /* sector must be pre-erased */ |
| 64 | #define OP_MWRITE_BUFFER2 0x89 /* sector must be pre-erased */ |
| 65 | |
| 66 | /* write to buffer, then write-erase to flash */ |
| 67 | #define OP_PROGRAM_VIA_BUF1 0x82 |
| 68 | #define OP_PROGRAM_VIA_BUF2 0x85 |
| 69 | |
| 70 | /* compare buffer to flash */ |
| 71 | #define OP_COMPARE_BUF1 0x60 |
| 72 | #define OP_COMPARE_BUF2 0x61 |
| 73 | |
| 74 | /* read flash to buffer, then write-erase to flash */ |
| 75 | #define OP_REWRITE_VIA_BUF1 0x58 |
| 76 | #define OP_REWRITE_VIA_BUF2 0x59 |
| 77 | |
| 78 | /* newer chips report JEDEC manufacturer and device IDs; chip |
| 79 | * serial number and OTP bits; and per-sector writeprotect. |
| 80 | */ |
| 81 | #define OP_READ_ID 0x9F |
| 82 | #define OP_READ_SECURITY 0x77 |
| 83 | #define OP_WRITE_SECURITY 0x9A /* OTP bits */ |
| 84 | |
| 85 | |
| 86 | struct dataflash { |
David Woodhouse | 271c5c5 | 2008-06-04 17:43:22 +0100 | [diff] [blame] | 87 | uint8_t command[4]; |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 88 | char name[24]; |
| 89 | |
| 90 | unsigned partitioned:1; |
| 91 | |
| 92 | unsigned short page_offset; /* offset in flash address */ |
| 93 | unsigned int page_size; /* of bytes per page */ |
| 94 | |
Matthias Kaehlcke | ec9ce52 | 2007-06-28 22:58:42 +0100 | [diff] [blame] | 95 | struct mutex lock; |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 96 | struct spi_device *spi; |
| 97 | |
| 98 | struct mtd_info mtd; |
| 99 | }; |
| 100 | |
| 101 | #ifdef CONFIG_MTD_PARTITIONS |
| 102 | #define mtd_has_partitions() (1) |
| 103 | #else |
| 104 | #define mtd_has_partitions() (0) |
| 105 | #endif |
| 106 | |
| 107 | /* ......................................................................... */ |
| 108 | |
| 109 | /* |
| 110 | * Return the status of the DataFlash device. |
| 111 | */ |
| 112 | static inline int dataflash_status(struct spi_device *spi) |
| 113 | { |
| 114 | /* NOTE: at45db321c over 25 MHz wants to write |
| 115 | * a dummy byte after the opcode... |
| 116 | */ |
| 117 | return spi_w8r8(spi, OP_READ_STATUS); |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * Poll the DataFlash device until it is READY. |
| 122 | * This usually takes 5-20 msec or so; more for sector erase. |
| 123 | */ |
| 124 | static int dataflash_waitready(struct spi_device *spi) |
| 125 | { |
| 126 | int status; |
| 127 | |
| 128 | for (;;) { |
| 129 | status = dataflash_status(spi); |
| 130 | if (status < 0) { |
| 131 | DEBUG(MTD_DEBUG_LEVEL1, "%s: status %d?\n", |
| 132 | spi->dev.bus_id, status); |
| 133 | status = 0; |
| 134 | } |
| 135 | |
| 136 | if (status & (1 << 7)) /* RDY/nBSY */ |
| 137 | return status; |
| 138 | |
| 139 | msleep(3); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | /* ......................................................................... */ |
| 144 | |
| 145 | /* |
| 146 | * Erase pages of flash. |
| 147 | */ |
| 148 | static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr) |
| 149 | { |
| 150 | struct dataflash *priv = (struct dataflash *)mtd->priv; |
| 151 | struct spi_device *spi = priv->spi; |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 152 | struct spi_transfer x = { .tx_dma = 0, }; |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 153 | struct spi_message msg; |
| 154 | unsigned blocksize = priv->page_size << 3; |
David Woodhouse | 271c5c5 | 2008-06-04 17:43:22 +0100 | [diff] [blame] | 155 | uint8_t *command; |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 156 | |
| 157 | DEBUG(MTD_DEBUG_LEVEL2, "%s: erase addr=0x%x len 0x%x\n", |
| 158 | spi->dev.bus_id, |
| 159 | instr->addr, instr->len); |
| 160 | |
| 161 | /* Sanity checks */ |
| 162 | if ((instr->addr + instr->len) > mtd->size |
| 163 | || (instr->len % priv->page_size) != 0 |
| 164 | || (instr->addr % priv->page_size) != 0) |
| 165 | return -EINVAL; |
| 166 | |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 167 | spi_message_init(&msg); |
| 168 | |
| 169 | x.tx_buf = command = priv->command; |
| 170 | x.len = 4; |
| 171 | spi_message_add_tail(&x, &msg); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 172 | |
Matthias Kaehlcke | ec9ce52 | 2007-06-28 22:58:42 +0100 | [diff] [blame] | 173 | mutex_lock(&priv->lock); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 174 | while (instr->len > 0) { |
| 175 | unsigned int pageaddr; |
| 176 | int status; |
| 177 | int do_block; |
| 178 | |
| 179 | /* Calculate flash page address; use block erase (for speed) if |
| 180 | * we're at a block boundary and need to erase the whole block. |
| 181 | */ |
| 182 | pageaddr = instr->addr / priv->page_size; |
David Brownell | 3cb4f09 | 2006-03-13 21:20:40 -0800 | [diff] [blame] | 183 | do_block = (pageaddr & 0x7) == 0 && instr->len >= blocksize; |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 184 | pageaddr = pageaddr << priv->page_offset; |
| 185 | |
| 186 | command[0] = do_block ? OP_ERASE_BLOCK : OP_ERASE_PAGE; |
David Woodhouse | 271c5c5 | 2008-06-04 17:43:22 +0100 | [diff] [blame] | 187 | command[1] = (uint8_t)(pageaddr >> 16); |
| 188 | command[2] = (uint8_t)(pageaddr >> 8); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 189 | command[3] = 0; |
| 190 | |
| 191 | DEBUG(MTD_DEBUG_LEVEL3, "ERASE %s: (%x) %x %x %x [%i]\n", |
| 192 | do_block ? "block" : "page", |
| 193 | command[0], command[1], command[2], command[3], |
| 194 | pageaddr); |
| 195 | |
| 196 | status = spi_sync(spi, &msg); |
| 197 | (void) dataflash_waitready(spi); |
| 198 | |
| 199 | if (status < 0) { |
| 200 | printk(KERN_ERR "%s: erase %x, err %d\n", |
| 201 | spi->dev.bus_id, pageaddr, status); |
| 202 | /* REVISIT: can retry instr->retries times; or |
| 203 | * giveup and instr->fail_addr = instr->addr; |
| 204 | */ |
| 205 | continue; |
| 206 | } |
| 207 | |
| 208 | if (do_block) { |
| 209 | instr->addr += blocksize; |
| 210 | instr->len -= blocksize; |
| 211 | } else { |
| 212 | instr->addr += priv->page_size; |
| 213 | instr->len -= priv->page_size; |
| 214 | } |
| 215 | } |
Matthias Kaehlcke | ec9ce52 | 2007-06-28 22:58:42 +0100 | [diff] [blame] | 216 | mutex_unlock(&priv->lock); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 217 | |
| 218 | /* Inform MTD subsystem that erase is complete */ |
| 219 | instr->state = MTD_ERASE_DONE; |
| 220 | mtd_erase_callback(instr); |
| 221 | |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * Read from the DataFlash device. |
| 227 | * from : Start offset in flash device |
| 228 | * len : Amount to read |
| 229 | * retlen : About of data actually read |
| 230 | * buf : Buffer containing the data |
| 231 | */ |
| 232 | static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len, |
| 233 | size_t *retlen, u_char *buf) |
| 234 | { |
| 235 | struct dataflash *priv = (struct dataflash *)mtd->priv; |
| 236 | struct spi_transfer x[2] = { { .tx_dma = 0, }, }; |
| 237 | struct spi_message msg; |
| 238 | unsigned int addr; |
David Woodhouse | 271c5c5 | 2008-06-04 17:43:22 +0100 | [diff] [blame] | 239 | uint8_t *command; |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 240 | int status; |
| 241 | |
| 242 | DEBUG(MTD_DEBUG_LEVEL2, "%s: read 0x%x..0x%x\n", |
| 243 | priv->spi->dev.bus_id, (unsigned)from, (unsigned)(from + len)); |
| 244 | |
| 245 | *retlen = 0; |
| 246 | |
| 247 | /* Sanity checks */ |
| 248 | if (!len) |
| 249 | return 0; |
| 250 | if (from + len > mtd->size) |
| 251 | return -EINVAL; |
| 252 | |
| 253 | /* Calculate flash page/byte address */ |
| 254 | addr = (((unsigned)from / priv->page_size) << priv->page_offset) |
| 255 | + ((unsigned)from % priv->page_size); |
| 256 | |
| 257 | command = priv->command; |
| 258 | |
| 259 | DEBUG(MTD_DEBUG_LEVEL3, "READ: (%x) %x %x %x\n", |
| 260 | command[0], command[1], command[2], command[3]); |
| 261 | |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 262 | spi_message_init(&msg); |
| 263 | |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 264 | x[0].tx_buf = command; |
| 265 | x[0].len = 8; |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 266 | spi_message_add_tail(&x[0], &msg); |
| 267 | |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 268 | x[1].rx_buf = buf; |
| 269 | x[1].len = len; |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 270 | spi_message_add_tail(&x[1], &msg); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 271 | |
Matthias Kaehlcke | ec9ce52 | 2007-06-28 22:58:42 +0100 | [diff] [blame] | 272 | mutex_lock(&priv->lock); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 273 | |
| 274 | /* Continuous read, max clock = f(car) which may be less than |
| 275 | * the peak rate available. Some chips support commands with |
| 276 | * fewer "don't care" bytes. Both buffers stay unchanged. |
| 277 | */ |
| 278 | command[0] = OP_READ_CONTINUOUS; |
David Woodhouse | 271c5c5 | 2008-06-04 17:43:22 +0100 | [diff] [blame] | 279 | command[1] = (uint8_t)(addr >> 16); |
| 280 | command[2] = (uint8_t)(addr >> 8); |
| 281 | command[3] = (uint8_t)(addr >> 0); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 282 | /* plus 4 "don't care" bytes */ |
| 283 | |
| 284 | status = spi_sync(priv->spi, &msg); |
Matthias Kaehlcke | ec9ce52 | 2007-06-28 22:58:42 +0100 | [diff] [blame] | 285 | mutex_unlock(&priv->lock); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 286 | |
| 287 | if (status >= 0) { |
| 288 | *retlen = msg.actual_length - 8; |
| 289 | status = 0; |
| 290 | } else |
| 291 | DEBUG(MTD_DEBUG_LEVEL1, "%s: read %x..%x --> %d\n", |
| 292 | priv->spi->dev.bus_id, |
| 293 | (unsigned)from, (unsigned)(from + len), |
| 294 | status); |
| 295 | return status; |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * Write to the DataFlash device. |
| 300 | * to : Start offset in flash device |
| 301 | * len : Amount to write |
| 302 | * retlen : Amount of data actually written |
| 303 | * buf : Buffer containing the data |
| 304 | */ |
| 305 | static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len, |
| 306 | size_t * retlen, const u_char * buf) |
| 307 | { |
| 308 | struct dataflash *priv = (struct dataflash *)mtd->priv; |
| 309 | struct spi_device *spi = priv->spi; |
| 310 | struct spi_transfer x[2] = { { .tx_dma = 0, }, }; |
| 311 | struct spi_message msg; |
| 312 | unsigned int pageaddr, addr, offset, writelen; |
| 313 | size_t remaining = len; |
| 314 | u_char *writebuf = (u_char *) buf; |
| 315 | int status = -EINVAL; |
David Woodhouse | 271c5c5 | 2008-06-04 17:43:22 +0100 | [diff] [blame] | 316 | uint8_t *command; |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 317 | |
| 318 | DEBUG(MTD_DEBUG_LEVEL2, "%s: write 0x%x..0x%x\n", |
| 319 | spi->dev.bus_id, (unsigned)to, (unsigned)(to + len)); |
| 320 | |
| 321 | *retlen = 0; |
| 322 | |
| 323 | /* Sanity checks */ |
| 324 | if (!len) |
| 325 | return 0; |
| 326 | if ((to + len) > mtd->size) |
| 327 | return -EINVAL; |
| 328 | |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 329 | spi_message_init(&msg); |
| 330 | |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 331 | x[0].tx_buf = command = priv->command; |
| 332 | x[0].len = 4; |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 333 | spi_message_add_tail(&x[0], &msg); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 334 | |
| 335 | pageaddr = ((unsigned)to / priv->page_size); |
| 336 | offset = ((unsigned)to % priv->page_size); |
| 337 | if (offset + len > priv->page_size) |
| 338 | writelen = priv->page_size - offset; |
| 339 | else |
| 340 | writelen = len; |
| 341 | |
Matthias Kaehlcke | ec9ce52 | 2007-06-28 22:58:42 +0100 | [diff] [blame] | 342 | mutex_lock(&priv->lock); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 343 | while (remaining > 0) { |
| 344 | DEBUG(MTD_DEBUG_LEVEL3, "write @ %i:%i len=%i\n", |
| 345 | pageaddr, offset, writelen); |
| 346 | |
| 347 | /* REVISIT: |
| 348 | * (a) each page in a sector must be rewritten at least |
| 349 | * once every 10K sibling erase/program operations. |
| 350 | * (b) for pages that are already erased, we could |
| 351 | * use WRITE+MWRITE not PROGRAM for ~30% speedup. |
| 352 | * (c) WRITE to buffer could be done while waiting for |
| 353 | * a previous MWRITE/MWERASE to complete ... |
| 354 | * (d) error handling here seems to be mostly missing. |
| 355 | * |
| 356 | * Two persistent bits per page, plus a per-sector counter, |
| 357 | * could support (a) and (b) ... we might consider using |
| 358 | * the second half of sector zero, which is just one block, |
| 359 | * to track that state. (On AT91, that sector should also |
| 360 | * support boot-from-DataFlash.) |
| 361 | */ |
| 362 | |
| 363 | addr = pageaddr << priv->page_offset; |
| 364 | |
| 365 | /* (1) Maybe transfer partial page to Buffer1 */ |
| 366 | if (writelen != priv->page_size) { |
| 367 | command[0] = OP_TRANSFER_BUF1; |
| 368 | command[1] = (addr & 0x00FF0000) >> 16; |
| 369 | command[2] = (addr & 0x0000FF00) >> 8; |
| 370 | command[3] = 0; |
| 371 | |
| 372 | DEBUG(MTD_DEBUG_LEVEL3, "TRANSFER: (%x) %x %x %x\n", |
| 373 | command[0], command[1], command[2], command[3]); |
| 374 | |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 375 | status = spi_sync(spi, &msg); |
| 376 | if (status < 0) |
| 377 | DEBUG(MTD_DEBUG_LEVEL1, "%s: xfer %u -> %d \n", |
| 378 | spi->dev.bus_id, addr, status); |
| 379 | |
| 380 | (void) dataflash_waitready(priv->spi); |
| 381 | } |
| 382 | |
| 383 | /* (2) Program full page via Buffer1 */ |
| 384 | addr += offset; |
| 385 | command[0] = OP_PROGRAM_VIA_BUF1; |
| 386 | command[1] = (addr & 0x00FF0000) >> 16; |
| 387 | command[2] = (addr & 0x0000FF00) >> 8; |
| 388 | command[3] = (addr & 0x000000FF); |
| 389 | |
| 390 | DEBUG(MTD_DEBUG_LEVEL3, "PROGRAM: (%x) %x %x %x\n", |
| 391 | command[0], command[1], command[2], command[3]); |
| 392 | |
| 393 | x[1].tx_buf = writebuf; |
| 394 | x[1].len = writelen; |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 395 | spi_message_add_tail(x + 1, &msg); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 396 | status = spi_sync(spi, &msg); |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 397 | spi_transfer_del(x + 1); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 398 | if (status < 0) |
| 399 | DEBUG(MTD_DEBUG_LEVEL1, "%s: pgm %u/%u -> %d \n", |
| 400 | spi->dev.bus_id, addr, writelen, status); |
| 401 | |
| 402 | (void) dataflash_waitready(priv->spi); |
| 403 | |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 404 | |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 405 | #ifdef CONFIG_DATAFLASH_WRITE_VERIFY |
| 406 | |
| 407 | /* (3) Compare to Buffer1 */ |
| 408 | addr = pageaddr << priv->page_offset; |
| 409 | command[0] = OP_COMPARE_BUF1; |
| 410 | command[1] = (addr & 0x00FF0000) >> 16; |
| 411 | command[2] = (addr & 0x0000FF00) >> 8; |
| 412 | command[3] = 0; |
| 413 | |
| 414 | DEBUG(MTD_DEBUG_LEVEL3, "COMPARE: (%x) %x %x %x\n", |
| 415 | command[0], command[1], command[2], command[3]); |
| 416 | |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 417 | status = spi_sync(spi, &msg); |
| 418 | if (status < 0) |
| 419 | DEBUG(MTD_DEBUG_LEVEL1, "%s: compare %u -> %d \n", |
| 420 | spi->dev.bus_id, addr, status); |
| 421 | |
| 422 | status = dataflash_waitready(priv->spi); |
| 423 | |
| 424 | /* Check result of the compare operation */ |
Andrew Victor | cccb45d | 2007-11-19 15:37:23 +0200 | [diff] [blame] | 425 | if (status & (1 << 6)) { |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 426 | printk(KERN_ERR "%s: compare page %u, err %d\n", |
| 427 | spi->dev.bus_id, pageaddr, status); |
| 428 | remaining = 0; |
| 429 | status = -EIO; |
| 430 | break; |
| 431 | } else |
| 432 | status = 0; |
| 433 | |
| 434 | #endif /* CONFIG_DATAFLASH_WRITE_VERIFY */ |
| 435 | |
| 436 | remaining = remaining - writelen; |
| 437 | pageaddr++; |
| 438 | offset = 0; |
| 439 | writebuf += writelen; |
| 440 | *retlen += writelen; |
| 441 | |
| 442 | if (remaining > priv->page_size) |
| 443 | writelen = priv->page_size; |
| 444 | else |
| 445 | writelen = remaining; |
| 446 | } |
Matthias Kaehlcke | ec9ce52 | 2007-06-28 22:58:42 +0100 | [diff] [blame] | 447 | mutex_unlock(&priv->lock); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 448 | |
| 449 | return status; |
| 450 | } |
| 451 | |
| 452 | /* ......................................................................... */ |
| 453 | |
| 454 | /* |
| 455 | * Register DataFlash device with MTD subsystem. |
| 456 | */ |
| 457 | static int __devinit |
| 458 | add_dataflash(struct spi_device *spi, char *name, |
| 459 | int nr_pages, int pagesize, int pageoffset) |
| 460 | { |
| 461 | struct dataflash *priv; |
| 462 | struct mtd_info *device; |
| 463 | struct flash_platform_data *pdata = spi->dev.platform_data; |
| 464 | |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 465 | priv = kzalloc(sizeof *priv, GFP_KERNEL); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 466 | if (!priv) |
| 467 | return -ENOMEM; |
| 468 | |
Matthias Kaehlcke | ec9ce52 | 2007-06-28 22:58:42 +0100 | [diff] [blame] | 469 | mutex_init(&priv->lock); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 470 | priv->spi = spi; |
| 471 | priv->page_size = pagesize; |
| 472 | priv->page_offset = pageoffset; |
| 473 | |
| 474 | /* name must be usable with cmdlinepart */ |
| 475 | sprintf(priv->name, "spi%d.%d-%s", |
| 476 | spi->master->bus_num, spi->chip_select, |
| 477 | name); |
| 478 | |
| 479 | device = &priv->mtd; |
| 480 | device->name = (pdata && pdata->name) ? pdata->name : priv->name; |
| 481 | device->size = nr_pages * pagesize; |
| 482 | device->erasesize = pagesize; |
Artem B. Bityutskiy | 17ffc7b | 2006-06-22 18:15:48 +0400 | [diff] [blame] | 483 | device->writesize = pagesize; |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 484 | device->owner = THIS_MODULE; |
| 485 | device->type = MTD_DATAFLASH; |
Haavard Skinnemoen | 6c33caf | 2006-11-29 14:26:07 +0100 | [diff] [blame] | 486 | device->flags = MTD_WRITEABLE; |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 487 | device->erase = dataflash_erase; |
| 488 | device->read = dataflash_read; |
| 489 | device->write = dataflash_write; |
| 490 | device->priv = priv; |
| 491 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 492 | dev_info(&spi->dev, "%s (%d KBytes) pagesize %d bytes\n", |
| 493 | name, DIV_ROUND_UP(device->size, 1024), pagesize); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 494 | dev_set_drvdata(&spi->dev, priv); |
| 495 | |
| 496 | if (mtd_has_partitions()) { |
| 497 | struct mtd_partition *parts; |
| 498 | int nr_parts = 0; |
| 499 | |
| 500 | #ifdef CONFIG_MTD_CMDLINE_PARTS |
| 501 | static const char *part_probes[] = { "cmdlinepart", NULL, }; |
| 502 | |
| 503 | nr_parts = parse_mtd_partitions(device, part_probes, &parts, 0); |
| 504 | #endif |
| 505 | |
| 506 | if (nr_parts <= 0 && pdata && pdata->parts) { |
| 507 | parts = pdata->parts; |
| 508 | nr_parts = pdata->nr_parts; |
| 509 | } |
| 510 | |
| 511 | if (nr_parts > 0) { |
| 512 | priv->partitioned = 1; |
| 513 | return add_mtd_partitions(device, parts, nr_parts); |
| 514 | } |
David Brownell | 7111763 | 2006-01-08 13:34:29 -0800 | [diff] [blame] | 515 | } else if (pdata && pdata->nr_parts) |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 516 | dev_warn(&spi->dev, "ignoring %d default partitions on %s\n", |
| 517 | pdata->nr_parts, device->name); |
| 518 | |
| 519 | return add_mtd_device(device) == 1 ? -ENODEV : 0; |
| 520 | } |
| 521 | |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 522 | struct flash_info { |
| 523 | char *name; |
| 524 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 525 | /* JEDEC id has a high byte of zero plus three data bytes: |
| 526 | * the manufacturer id, then a two byte device id. |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 527 | */ |
David Woodhouse | 271c5c5 | 2008-06-04 17:43:22 +0100 | [diff] [blame] | 528 | uint32_t jedec_id; |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 529 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 530 | /* The size listed here is what works with OP_ERASE_PAGE. */ |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 531 | unsigned nr_pages; |
David Woodhouse | 271c5c5 | 2008-06-04 17:43:22 +0100 | [diff] [blame] | 532 | uint16_t pagesize; |
| 533 | uint16_t pageoffset; |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 534 | |
David Woodhouse | 271c5c5 | 2008-06-04 17:43:22 +0100 | [diff] [blame] | 535 | uint16_t flags; |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 536 | #define SUP_POW2PS 0x0002 /* supports 2^N byte pages */ |
| 537 | #define IS_POW2PS 0x0001 /* uses 2^N byte pages */ |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 538 | }; |
| 539 | |
| 540 | static struct flash_info __devinitdata dataflash_data [] = { |
| 541 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 542 | /* |
| 543 | * NOTE: chips with SUP_POW2PS (rev D and up) need two entries, |
| 544 | * one with IS_POW2PS and the other without. The entry with the |
| 545 | * non-2^N byte page size can't name exact chip revisions without |
| 546 | * losing backwards compatibility for cmdlinepart. |
| 547 | * |
| 548 | * These newer chips also support 128-byte security registers (with |
| 549 | * 64 bytes one-time-programmable) and software write-protection. |
| 550 | */ |
| 551 | { "AT45DB011B", 0x1f2200, 512, 264, 9, SUP_POW2PS}, |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 552 | { "at45db011d", 0x1f2200, 512, 256, 8, SUP_POW2PS | IS_POW2PS}, |
| 553 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 554 | { "AT45DB021B", 0x1f2300, 1024, 264, 9, SUP_POW2PS}, |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 555 | { "at45db021d", 0x1f2300, 1024, 256, 8, SUP_POW2PS | IS_POW2PS}, |
| 556 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 557 | { "AT45DB041x", 0x1f2400, 2048, 264, 9, SUP_POW2PS}, |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 558 | { "at45db041d", 0x1f2400, 2048, 256, 8, SUP_POW2PS | IS_POW2PS}, |
| 559 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 560 | { "AT45DB081B", 0x1f2500, 4096, 264, 9, SUP_POW2PS}, |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 561 | { "at45db081d", 0x1f2500, 4096, 256, 8, SUP_POW2PS | IS_POW2PS}, |
| 562 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 563 | { "AT45DB161x", 0x1f2600, 4096, 528, 10, SUP_POW2PS}, |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 564 | { "at45db161d", 0x1f2600, 4096, 512, 9, SUP_POW2PS | IS_POW2PS}, |
| 565 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 566 | { "AT45DB321x", 0x1f2700, 8192, 528, 10, 0}, /* rev C */ |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 567 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 568 | { "AT45DB321x", 0x1f2701, 8192, 528, 10, SUP_POW2PS}, |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 569 | { "at45db321d", 0x1f2701, 8192, 512, 9, SUP_POW2PS | IS_POW2PS}, |
| 570 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 571 | { "AT45DB642x", 0x1f2800, 8192, 1056, 11, SUP_POW2PS}, |
| 572 | { "at45db642d", 0x1f2800, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS}, |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 573 | }; |
| 574 | |
| 575 | static struct flash_info *__devinit jedec_probe(struct spi_device *spi) |
| 576 | { |
| 577 | int tmp; |
David Woodhouse | 271c5c5 | 2008-06-04 17:43:22 +0100 | [diff] [blame] | 578 | uint8_t code = OP_READ_ID; |
| 579 | uint8_t id[3]; |
| 580 | uint32_t jedec; |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 581 | struct flash_info *info; |
| 582 | int status; |
| 583 | |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 584 | /* JEDEC also defines an optional "extended device information" |
| 585 | * string for after vendor-specific data, after the three bytes |
| 586 | * we use here. Supporting some chips might require using it. |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 587 | * |
| 588 | * If the vendor ID isn't Atmel's (0x1f), assume this call failed. |
| 589 | * That's not an error; only rev C and newer chips handle it, and |
| 590 | * only Atmel sells these chips. |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 591 | */ |
| 592 | tmp = spi_write_then_read(spi, &code, 1, id, 3); |
| 593 | if (tmp < 0) { |
| 594 | DEBUG(MTD_DEBUG_LEVEL0, "%s: error %d reading JEDEC ID\n", |
| 595 | spi->dev.bus_id, tmp); |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 596 | return ERR_PTR(tmp); |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 597 | } |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 598 | if (id[0] != 0x1f) |
| 599 | return NULL; |
| 600 | |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 601 | jedec = id[0]; |
| 602 | jedec = jedec << 8; |
| 603 | jedec |= id[1]; |
| 604 | jedec = jedec << 8; |
| 605 | jedec |= id[2]; |
| 606 | |
| 607 | for (tmp = 0, info = dataflash_data; |
| 608 | tmp < ARRAY_SIZE(dataflash_data); |
| 609 | tmp++, info++) { |
| 610 | if (info->jedec_id == jedec) { |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 611 | DEBUG(MTD_DEBUG_LEVEL1, "%s: OTP, sector protect%s\n", |
| 612 | dev_name(&spi->dev), |
| 613 | (info->flags & SUP_POW2PS) |
| 614 | ? ", binary pagesize" : "" |
| 615 | ); |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 616 | if (info->flags & SUP_POW2PS) { |
| 617 | status = dataflash_status(spi); |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 618 | if (status < 0) { |
| 619 | DEBUG(MTD_DEBUG_LEVEL1, |
| 620 | "%s: status error %d\n", |
| 621 | dev_name(&spi->dev), status); |
| 622 | return ERR_PTR(status); |
| 623 | } |
| 624 | if (status & 0x1) { |
| 625 | if (info->flags & IS_POW2PS) |
| 626 | return info; |
| 627 | } else { |
| 628 | if (!(info->flags & IS_POW2PS)) |
| 629 | return info; |
| 630 | } |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 631 | } |
| 632 | } |
| 633 | } |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 634 | |
| 635 | /* |
| 636 | * Treat other chips as errors ... we won't know the right page |
| 637 | * size (it might be binary) even when we can tell which density |
| 638 | * class is involved (legacy chip id scheme). |
| 639 | */ |
| 640 | dev_warn(&spi->dev, "JEDEC id %06x not handled\n", jedec); |
| 641 | return ERR_PTR(-ENODEV); |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 642 | } |
| 643 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 644 | /* |
| 645 | * Detect and initialize DataFlash device, using JEDEC IDs on newer chips |
| 646 | * or else the ID code embedded in the status bits: |
| 647 | * |
| 648 | * Device Density ID code #Pages PageSize Offset |
| 649 | * AT45DB011B 1Mbit (128K) xx0011xx (0x0c) 512 264 9 |
| 650 | * AT45DB021B 2Mbit (256K) xx0101xx (0x14) 1024 264 9 |
| 651 | * AT45DB041B 4Mbit (512K) xx0111xx (0x1c) 2048 264 9 |
| 652 | * AT45DB081B 8Mbit (1M) xx1001xx (0x24) 4096 264 9 |
| 653 | * AT45DB0161B 16Mbit (2M) xx1011xx (0x2c) 4096 528 10 |
| 654 | * AT45DB0321B 32Mbit (4M) xx1101xx (0x34) 8192 528 10 |
| 655 | * AT45DB0642 64Mbit (8M) xx111xxx (0x3c) 8192 1056 11 |
| 656 | * AT45DB1282 128Mbit (16M) xx0100xx (0x10) 16384 1056 11 |
| 657 | */ |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 658 | static int __devinit dataflash_probe(struct spi_device *spi) |
| 659 | { |
| 660 | int status; |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 661 | struct flash_info *info; |
| 662 | |
| 663 | /* |
| 664 | * Try to detect dataflash by JEDEC ID. |
| 665 | * If it succeeds we know we have either a C or D part. |
| 666 | * D will support power of 2 pagesize option. |
| 667 | */ |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 668 | info = jedec_probe(spi); |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 669 | if (IS_ERR(info)) |
| 670 | return PTR_ERR(info); |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 671 | if (info != NULL) |
| 672 | return add_dataflash(spi, info->name, info->nr_pages, |
| 673 | info->pagesize, info->pageoffset); |
| 674 | |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 675 | /* |
| 676 | * Older chips support only legacy commands, identifing |
| 677 | * capacity using bits in the status byte. |
| 678 | */ |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 679 | status = dataflash_status(spi); |
| 680 | if (status <= 0 || status == 0xff) { |
| 681 | DEBUG(MTD_DEBUG_LEVEL1, "%s: status error %d\n", |
| 682 | spi->dev.bus_id, status); |
David Brownell | de4fa9926 | 2006-12-29 16:48:47 -0800 | [diff] [blame] | 683 | if (status == 0 || status == 0xff) |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 684 | status = -ENODEV; |
| 685 | return status; |
| 686 | } |
| 687 | |
| 688 | /* if there's a device there, assume it's dataflash. |
| 689 | * board setup should have set spi->max_speed_max to |
| 690 | * match f(car) for continuous reads, mode 0 or 3. |
| 691 | */ |
| 692 | switch (status & 0x3c) { |
| 693 | case 0x0c: /* 0 0 1 1 x x */ |
| 694 | status = add_dataflash(spi, "AT45DB011B", 512, 264, 9); |
| 695 | break; |
| 696 | case 0x14: /* 0 1 0 1 x x */ |
Michael Hennerich | e9d4222 | 2008-06-03 12:26:05 +0800 | [diff] [blame] | 697 | status = add_dataflash(spi, "AT45DB021B", 1024, 264, 9); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 698 | break; |
| 699 | case 0x1c: /* 0 1 1 1 x x */ |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 700 | status = add_dataflash(spi, "AT45DB041x", 2048, 264, 9); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 701 | break; |
| 702 | case 0x24: /* 1 0 0 1 x x */ |
| 703 | status = add_dataflash(spi, "AT45DB081B", 4096, 264, 9); |
| 704 | break; |
| 705 | case 0x2c: /* 1 0 1 1 x x */ |
akpm@linux-foundation.org | 771999b | 2008-07-29 22:22:40 -0700 | [diff] [blame^] | 706 | status = add_dataflash(spi, "AT45DB161x", 4096, 528, 10); |
David Brownell | 1d6432f | 2006-01-08 13:34:22 -0800 | [diff] [blame] | 707 | break; |
| 708 | case 0x34: /* 1 1 0 1 x x */ |
| 709 | status = add_dataflash(spi, "AT45DB321x", 8192, 528, 10); |
| 710 | break; |
| 711 | case 0x38: /* 1 1 1 x x x */ |
| 712 | case 0x3c: |
| 713 | status = add_dataflash(spi, "AT45DB642x", 8192, 1056, 11); |
| 714 | break; |
| 715 | /* obsolete AT45DB1282 not (yet?) supported */ |
| 716 | default: |
| 717 | DEBUG(MTD_DEBUG_LEVEL1, "%s: unsupported device (%x)\n", |
| 718 | spi->dev.bus_id, status & 0x3c); |
| 719 | status = -ENODEV; |
| 720 | } |
| 721 | |
| 722 | if (status < 0) |
| 723 | DEBUG(MTD_DEBUG_LEVEL1, "%s: add_dataflash --> %d\n", |
| 724 | spi->dev.bus_id, status); |
| 725 | |
| 726 | return status; |
| 727 | } |
| 728 | |
| 729 | static int __devexit dataflash_remove(struct spi_device *spi) |
| 730 | { |
| 731 | struct dataflash *flash = dev_get_drvdata(&spi->dev); |
| 732 | int status; |
| 733 | |
| 734 | DEBUG(MTD_DEBUG_LEVEL1, "%s: remove\n", spi->dev.bus_id); |
| 735 | |
| 736 | if (mtd_has_partitions() && flash->partitioned) |
| 737 | status = del_mtd_partitions(&flash->mtd); |
| 738 | else |
| 739 | status = del_mtd_device(&flash->mtd); |
| 740 | if (status == 0) |
| 741 | kfree(flash); |
| 742 | return status; |
| 743 | } |
| 744 | |
| 745 | static struct spi_driver dataflash_driver = { |
| 746 | .driver = { |
| 747 | .name = "mtd_dataflash", |
| 748 | .bus = &spi_bus_type, |
| 749 | .owner = THIS_MODULE, |
| 750 | }, |
| 751 | |
| 752 | .probe = dataflash_probe, |
| 753 | .remove = __devexit_p(dataflash_remove), |
| 754 | |
| 755 | /* FIXME: investigate suspend and resume... */ |
| 756 | }; |
| 757 | |
| 758 | static int __init dataflash_init(void) |
| 759 | { |
| 760 | return spi_register_driver(&dataflash_driver); |
| 761 | } |
| 762 | module_init(dataflash_init); |
| 763 | |
| 764 | static void __exit dataflash_exit(void) |
| 765 | { |
| 766 | spi_unregister_driver(&dataflash_driver); |
| 767 | } |
| 768 | module_exit(dataflash_exit); |
| 769 | |
| 770 | |
| 771 | MODULE_LICENSE("GPL"); |
| 772 | MODULE_AUTHOR("Andrew Victor, David Brownell"); |
| 773 | MODULE_DESCRIPTION("MTD DataFlash driver"); |