Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/mtd/nand.c |
| 3 | * |
| 4 | * Overview: |
| 5 | * This is the generic MTD driver for NAND flash devices. It should be |
| 6 | * capable of working with almost all NAND chips currently available. |
| 7 | * Basic support for AG-AND chips is provided. |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 8 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Additional technical information is available on |
| 10 | * http://www.linux-mtd.infradead.org/tech/nand.html |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 11 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) |
| 13 | * 2002 Thomas Gleixner (tglx@linutronix.de) |
| 14 | * |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 15 | * 02-08-2004 tglx: support for strange chips, which cannot auto increment |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * pages on read / read_oob |
| 17 | * |
| 18 | * 03-17-2004 tglx: Check ready before auto increment check. Simon Bayes |
| 19 | * pointed this out, as he marked an auto increment capable chip |
| 20 | * as NOAUTOINCR in the board driver. |
| 21 | * Make reads over block boundaries work too |
| 22 | * |
| 23 | * 04-14-2004 tglx: first working version for 2k page size chips |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 24 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | * 05-19-2004 tglx: Basic support for Renesas AG-AND chips |
| 26 | * |
| 27 | * 09-24-2004 tglx: add support for hardware controllers (e.g. ECC) shared |
| 28 | * among multiple independend devices. Suggestions and initial patch |
| 29 | * from Ben Dooks <ben-mtd@fluff.org> |
| 30 | * |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 31 | * 12-05-2004 dmarlin: add workaround for Renesas AG-AND chips "disturb" issue. |
| 32 | * Basically, any block not rewritten may lose data when surrounding blocks |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 33 | * are rewritten many times. JFFS2 ensures this doesn't happen for blocks |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 34 | * it uses, but the Bad Block Table(s) may not be rewritten. To ensure they |
| 35 | * do not lose data, force them to be rewritten when some of the surrounding |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 36 | * blocks are erased. Rather than tracking a specific nearby block (which |
| 37 | * could itself go bad), use a page address 'mask' to select several blocks |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 38 | * in the same area, and rewrite the BBT when any of them are erased. |
| 39 | * |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 40 | * 01-03-2005 dmarlin: added support for the device recovery command sequence for Renesas |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 41 | * AG-AND chips. If there was a sudden loss of power during an erase operation, |
| 42 | * a "device recovery" operation must be performed when power is restored |
| 43 | * to ensure correct operation. |
| 44 | * |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 45 | * 01-20-2005 dmarlin: added support for optional hardware specific callback routine to |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 46 | * perform extra error status checks on erase and write failures. This required |
| 47 | * adding a wrapper function for nand_read_ecc. |
| 48 | * |
Vitaly Wool | 962034f | 2005-09-15 14:58:53 +0100 | [diff] [blame] | 49 | * 08-20-2005 vwool: suspend/resume added |
| 50 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | * Credits: |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 52 | * David Woodhouse for adding multichip support |
| 53 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | * Aleph One Ltd. and Toby Churchill Ltd. for supporting the |
| 55 | * rework for 2K page size chips |
| 56 | * |
| 57 | * TODO: |
| 58 | * Enable cached programming for 2k page size chips |
| 59 | * Check, if mtd->ecctype should be set to MTD_ECC_HW |
| 60 | * if we have HW ecc support. |
| 61 | * The AG-AND chips have nice features for speed improvement, |
| 62 | * which are not supported yet. Read / program 4 pages in one go. |
| 63 | * |
Vitaly Wool | 962034f | 2005-09-15 14:58:53 +0100 | [diff] [blame] | 64 | * $Id: nand_base.c,v 1.150 2005/09/15 13:58:48 vwool Exp $ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | * |
| 66 | * This program is free software; you can redistribute it and/or modify |
| 67 | * it under the terms of the GNU General Public License version 2 as |
| 68 | * published by the Free Software Foundation. |
| 69 | * |
| 70 | */ |
| 71 | |
| 72 | #include <linux/delay.h> |
| 73 | #include <linux/errno.h> |
| 74 | #include <linux/sched.h> |
| 75 | #include <linux/slab.h> |
| 76 | #include <linux/types.h> |
| 77 | #include <linux/mtd/mtd.h> |
| 78 | #include <linux/mtd/nand.h> |
| 79 | #include <linux/mtd/nand_ecc.h> |
| 80 | #include <linux/mtd/compatmac.h> |
| 81 | #include <linux/interrupt.h> |
| 82 | #include <linux/bitops.h> |
| 83 | #include <asm/io.h> |
| 84 | |
| 85 | #ifdef CONFIG_MTD_PARTITIONS |
| 86 | #include <linux/mtd/partitions.h> |
| 87 | #endif |
| 88 | |
| 89 | /* Define default oob placement schemes for large and small page devices */ |
| 90 | static struct nand_oobinfo nand_oob_8 = { |
| 91 | .useecc = MTD_NANDECC_AUTOPLACE, |
| 92 | .eccbytes = 3, |
| 93 | .eccpos = {0, 1, 2}, |
| 94 | .oobfree = { {3, 2}, {6, 2} } |
| 95 | }; |
| 96 | |
| 97 | static struct nand_oobinfo nand_oob_16 = { |
| 98 | .useecc = MTD_NANDECC_AUTOPLACE, |
| 99 | .eccbytes = 6, |
| 100 | .eccpos = {0, 1, 2, 3, 6, 7}, |
| 101 | .oobfree = { {8, 8} } |
| 102 | }; |
| 103 | |
| 104 | static struct nand_oobinfo nand_oob_64 = { |
| 105 | .useecc = MTD_NANDECC_AUTOPLACE, |
| 106 | .eccbytes = 24, |
| 107 | .eccpos = { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 108 | 40, 41, 42, 43, 44, 45, 46, 47, |
| 109 | 48, 49, 50, 51, 52, 53, 54, 55, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | 56, 57, 58, 59, 60, 61, 62, 63}, |
| 111 | .oobfree = { {2, 38} } |
| 112 | }; |
| 113 | |
| 114 | /* This is used for padding purposes in nand_write_oob */ |
| 115 | static u_char ffchars[] = { |
| 116 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 117 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 118 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 119 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 120 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 121 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 122 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 123 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 124 | }; |
| 125 | |
| 126 | /* |
| 127 | * NAND low-level MTD interface functions |
| 128 | */ |
| 129 | static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len); |
| 130 | static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len); |
| 131 | static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len); |
| 132 | |
| 133 | static int nand_read (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf); |
| 134 | static int nand_read_ecc (struct mtd_info *mtd, loff_t from, size_t len, |
| 135 | size_t * retlen, u_char * buf, u_char * eccbuf, struct nand_oobinfo *oobsel); |
| 136 | static int nand_read_oob (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf); |
| 137 | static int nand_write (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char * buf); |
| 138 | static int nand_write_ecc (struct mtd_info *mtd, loff_t to, size_t len, |
| 139 | size_t * retlen, const u_char * buf, u_char * eccbuf, struct nand_oobinfo *oobsel); |
| 140 | static int nand_write_oob (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char *buf); |
| 141 | static int nand_writev (struct mtd_info *mtd, const struct kvec *vecs, |
| 142 | unsigned long count, loff_t to, size_t * retlen); |
| 143 | static int nand_writev_ecc (struct mtd_info *mtd, const struct kvec *vecs, |
| 144 | unsigned long count, loff_t to, size_t * retlen, u_char *eccbuf, struct nand_oobinfo *oobsel); |
| 145 | static int nand_erase (struct mtd_info *mtd, struct erase_info *instr); |
| 146 | static void nand_sync (struct mtd_info *mtd); |
| 147 | |
| 148 | /* Some internal functions */ |
| 149 | static int nand_write_page (struct mtd_info *mtd, struct nand_chip *this, int page, u_char *oob_buf, |
| 150 | struct nand_oobinfo *oobsel, int mode); |
| 151 | #ifdef CONFIG_MTD_NAND_VERIFY_WRITE |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 152 | static int nand_verify_pages (struct mtd_info *mtd, struct nand_chip *this, int page, int numpages, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | u_char *oob_buf, struct nand_oobinfo *oobsel, int chipnr, int oobmode); |
| 154 | #else |
| 155 | #define nand_verify_pages(...) (0) |
| 156 | #endif |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 157 | |
Vitaly Wool | 962034f | 2005-09-15 14:58:53 +0100 | [diff] [blame] | 158 | static int nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | /** |
| 161 | * nand_release_device - [GENERIC] release chip |
| 162 | * @mtd: MTD device structure |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 163 | * |
| 164 | * Deselect, release chip lock and wake up anyone waiting on the device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | */ |
| 166 | static void nand_release_device (struct mtd_info *mtd) |
| 167 | { |
| 168 | struct nand_chip *this = mtd->priv; |
| 169 | |
| 170 | /* De-select the NAND device */ |
| 171 | this->select_chip(mtd, -1); |
Thomas Gleixner | 0dfc624 | 2005-05-31 20:39:20 +0100 | [diff] [blame] | 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | if (this->controller) { |
Thomas Gleixner | 0dfc624 | 2005-05-31 20:39:20 +0100 | [diff] [blame] | 174 | /* Release the controller and the chip */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | spin_lock(&this->controller->lock); |
| 176 | this->controller->active = NULL; |
Thomas Gleixner | 0dfc624 | 2005-05-31 20:39:20 +0100 | [diff] [blame] | 177 | this->state = FL_READY; |
| 178 | wake_up(&this->controller->wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | spin_unlock(&this->controller->lock); |
Thomas Gleixner | 0dfc624 | 2005-05-31 20:39:20 +0100 | [diff] [blame] | 180 | } else { |
| 181 | /* Release the chip */ |
| 182 | spin_lock(&this->chip_lock); |
| 183 | this->state = FL_READY; |
| 184 | wake_up(&this->wq); |
| 185 | spin_unlock(&this->chip_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | /** |
| 190 | * nand_read_byte - [DEFAULT] read one byte from the chip |
| 191 | * @mtd: MTD device structure |
| 192 | * |
| 193 | * Default read function for 8bit buswith |
| 194 | */ |
| 195 | static u_char nand_read_byte(struct mtd_info *mtd) |
| 196 | { |
| 197 | struct nand_chip *this = mtd->priv; |
| 198 | return readb(this->IO_ADDR_R); |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * nand_write_byte - [DEFAULT] write one byte to the chip |
| 203 | * @mtd: MTD device structure |
| 204 | * @byte: pointer to data byte to write |
| 205 | * |
| 206 | * Default write function for 8it buswith |
| 207 | */ |
| 208 | static void nand_write_byte(struct mtd_info *mtd, u_char byte) |
| 209 | { |
| 210 | struct nand_chip *this = mtd->priv; |
| 211 | writeb(byte, this->IO_ADDR_W); |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * nand_read_byte16 - [DEFAULT] read one byte endianess aware from the chip |
| 216 | * @mtd: MTD device structure |
| 217 | * |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 218 | * Default read function for 16bit buswith with |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | * endianess conversion |
| 220 | */ |
| 221 | static u_char nand_read_byte16(struct mtd_info *mtd) |
| 222 | { |
| 223 | struct nand_chip *this = mtd->priv; |
| 224 | return (u_char) cpu_to_le16(readw(this->IO_ADDR_R)); |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * nand_write_byte16 - [DEFAULT] write one byte endianess aware to the chip |
| 229 | * @mtd: MTD device structure |
| 230 | * @byte: pointer to data byte to write |
| 231 | * |
| 232 | * Default write function for 16bit buswith with |
| 233 | * endianess conversion |
| 234 | */ |
| 235 | static void nand_write_byte16(struct mtd_info *mtd, u_char byte) |
| 236 | { |
| 237 | struct nand_chip *this = mtd->priv; |
| 238 | writew(le16_to_cpu((u16) byte), this->IO_ADDR_W); |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * nand_read_word - [DEFAULT] read one word from the chip |
| 243 | * @mtd: MTD device structure |
| 244 | * |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 245 | * Default read function for 16bit buswith without |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | * endianess conversion |
| 247 | */ |
| 248 | static u16 nand_read_word(struct mtd_info *mtd) |
| 249 | { |
| 250 | struct nand_chip *this = mtd->priv; |
| 251 | return readw(this->IO_ADDR_R); |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * nand_write_word - [DEFAULT] write one word to the chip |
| 256 | * @mtd: MTD device structure |
| 257 | * @word: data word to write |
| 258 | * |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 259 | * Default write function for 16bit buswith without |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | * endianess conversion |
| 261 | */ |
| 262 | static void nand_write_word(struct mtd_info *mtd, u16 word) |
| 263 | { |
| 264 | struct nand_chip *this = mtd->priv; |
| 265 | writew(word, this->IO_ADDR_W); |
| 266 | } |
| 267 | |
| 268 | /** |
| 269 | * nand_select_chip - [DEFAULT] control CE line |
| 270 | * @mtd: MTD device structure |
| 271 | * @chip: chipnumber to select, -1 for deselect |
| 272 | * |
| 273 | * Default select function for 1 chip devices. |
| 274 | */ |
| 275 | static void nand_select_chip(struct mtd_info *mtd, int chip) |
| 276 | { |
| 277 | struct nand_chip *this = mtd->priv; |
| 278 | switch(chip) { |
| 279 | case -1: |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 280 | this->hwcontrol(mtd, NAND_CTL_CLRNCE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | break; |
| 282 | case 0: |
| 283 | this->hwcontrol(mtd, NAND_CTL_SETNCE); |
| 284 | break; |
| 285 | |
| 286 | default: |
| 287 | BUG(); |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | /** |
| 292 | * nand_write_buf - [DEFAULT] write buffer to chip |
| 293 | * @mtd: MTD device structure |
| 294 | * @buf: data buffer |
| 295 | * @len: number of bytes to write |
| 296 | * |
| 297 | * Default write function for 8bit buswith |
| 298 | */ |
| 299 | static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) |
| 300 | { |
| 301 | int i; |
| 302 | struct nand_chip *this = mtd->priv; |
| 303 | |
| 304 | for (i=0; i<len; i++) |
| 305 | writeb(buf[i], this->IO_ADDR_W); |
| 306 | } |
| 307 | |
| 308 | /** |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 309 | * nand_read_buf - [DEFAULT] read chip data into buffer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | * @mtd: MTD device structure |
| 311 | * @buf: buffer to store date |
| 312 | * @len: number of bytes to read |
| 313 | * |
| 314 | * Default read function for 8bit buswith |
| 315 | */ |
| 316 | static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) |
| 317 | { |
| 318 | int i; |
| 319 | struct nand_chip *this = mtd->priv; |
| 320 | |
| 321 | for (i=0; i<len; i++) |
| 322 | buf[i] = readb(this->IO_ADDR_R); |
| 323 | } |
| 324 | |
| 325 | /** |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 326 | * nand_verify_buf - [DEFAULT] Verify chip data against buffer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | * @mtd: MTD device structure |
| 328 | * @buf: buffer containing the data to compare |
| 329 | * @len: number of bytes to compare |
| 330 | * |
| 331 | * Default verify function for 8bit buswith |
| 332 | */ |
| 333 | static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len) |
| 334 | { |
| 335 | int i; |
| 336 | struct nand_chip *this = mtd->priv; |
| 337 | |
| 338 | for (i=0; i<len; i++) |
| 339 | if (buf[i] != readb(this->IO_ADDR_R)) |
| 340 | return -EFAULT; |
| 341 | |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | /** |
| 346 | * nand_write_buf16 - [DEFAULT] write buffer to chip |
| 347 | * @mtd: MTD device structure |
| 348 | * @buf: data buffer |
| 349 | * @len: number of bytes to write |
| 350 | * |
| 351 | * Default write function for 16bit buswith |
| 352 | */ |
| 353 | static void nand_write_buf16(struct mtd_info *mtd, const u_char *buf, int len) |
| 354 | { |
| 355 | int i; |
| 356 | struct nand_chip *this = mtd->priv; |
| 357 | u16 *p = (u16 *) buf; |
| 358 | len >>= 1; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | for (i=0; i<len; i++) |
| 361 | writew(p[i], this->IO_ADDR_W); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | /** |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 366 | * nand_read_buf16 - [DEFAULT] read chip data into buffer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | * @mtd: MTD device structure |
| 368 | * @buf: buffer to store date |
| 369 | * @len: number of bytes to read |
| 370 | * |
| 371 | * Default read function for 16bit buswith |
| 372 | */ |
| 373 | static void nand_read_buf16(struct mtd_info *mtd, u_char *buf, int len) |
| 374 | { |
| 375 | int i; |
| 376 | struct nand_chip *this = mtd->priv; |
| 377 | u16 *p = (u16 *) buf; |
| 378 | len >>= 1; |
| 379 | |
| 380 | for (i=0; i<len; i++) |
| 381 | p[i] = readw(this->IO_ADDR_R); |
| 382 | } |
| 383 | |
| 384 | /** |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 385 | * nand_verify_buf16 - [DEFAULT] Verify chip data against buffer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | * @mtd: MTD device structure |
| 387 | * @buf: buffer containing the data to compare |
| 388 | * @len: number of bytes to compare |
| 389 | * |
| 390 | * Default verify function for 16bit buswith |
| 391 | */ |
| 392 | static int nand_verify_buf16(struct mtd_info *mtd, const u_char *buf, int len) |
| 393 | { |
| 394 | int i; |
| 395 | struct nand_chip *this = mtd->priv; |
| 396 | u16 *p = (u16 *) buf; |
| 397 | len >>= 1; |
| 398 | |
| 399 | for (i=0; i<len; i++) |
| 400 | if (p[i] != readw(this->IO_ADDR_R)) |
| 401 | return -EFAULT; |
| 402 | |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | /** |
| 407 | * nand_block_bad - [DEFAULT] Read bad block marker from the chip |
| 408 | * @mtd: MTD device structure |
| 409 | * @ofs: offset from device start |
| 410 | * @getchip: 0, if the chip is already selected |
| 411 | * |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 412 | * Check, if the block is bad. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | */ |
| 414 | static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip) |
| 415 | { |
| 416 | int page, chipnr, res = 0; |
| 417 | struct nand_chip *this = mtd->priv; |
| 418 | u16 bad; |
| 419 | |
| 420 | if (getchip) { |
| 421 | page = (int)(ofs >> this->page_shift); |
| 422 | chipnr = (int)(ofs >> this->chip_shift); |
| 423 | |
| 424 | /* Grab the lock and see if the device is available */ |
| 425 | nand_get_device (this, mtd, FL_READING); |
| 426 | |
| 427 | /* Select the NAND device */ |
| 428 | this->select_chip(mtd, chipnr); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 429 | } else |
| 430 | page = (int) ofs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
| 432 | if (this->options & NAND_BUSWIDTH_16) { |
| 433 | this->cmdfunc (mtd, NAND_CMD_READOOB, this->badblockpos & 0xFE, page & this->pagemask); |
| 434 | bad = cpu_to_le16(this->read_word(mtd)); |
| 435 | if (this->badblockpos & 0x1) |
Vitaly Wool | 49196f3 | 2005-11-02 16:54:46 +0000 | [diff] [blame] | 436 | bad >>= 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | if ((bad & 0xFF) != 0xff) |
| 438 | res = 1; |
| 439 | } else { |
| 440 | this->cmdfunc (mtd, NAND_CMD_READOOB, this->badblockpos, page & this->pagemask); |
| 441 | if (this->read_byte(mtd) != 0xff) |
| 442 | res = 1; |
| 443 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | if (getchip) { |
| 446 | /* Deselect and wake up anyone waiting on the device */ |
| 447 | nand_release_device(mtd); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 448 | } |
| 449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | return res; |
| 451 | } |
| 452 | |
| 453 | /** |
| 454 | * nand_default_block_markbad - [DEFAULT] mark a block bad |
| 455 | * @mtd: MTD device structure |
| 456 | * @ofs: offset from device start |
| 457 | * |
| 458 | * This is the default implementation, which can be overridden by |
| 459 | * a hardware specific driver. |
| 460 | */ |
| 461 | static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs) |
| 462 | { |
| 463 | struct nand_chip *this = mtd->priv; |
| 464 | u_char buf[2] = {0, 0}; |
| 465 | size_t retlen; |
| 466 | int block; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | /* Get block number */ |
| 469 | block = ((int) ofs) >> this->bbt_erase_shift; |
Artem B. Bityuckiy | 41ce921 | 2005-02-09 14:50:00 +0000 | [diff] [blame] | 470 | if (this->bbt) |
| 471 | this->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
| 473 | /* Do we have a flash based bad block table ? */ |
| 474 | if (this->options & NAND_USE_FLASH_BBT) |
| 475 | return nand_update_bbt (mtd, ofs); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | /* We write two bytes, so we dont have to mess with 16 bit access */ |
| 478 | ofs += mtd->oobsize + (this->badblockpos & ~0x01); |
| 479 | return nand_write_oob (mtd, ofs , 2, &retlen, buf); |
| 480 | } |
| 481 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 482 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | * nand_check_wp - [GENERIC] check if the chip is write protected |
| 484 | * @mtd: MTD device structure |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 485 | * Check, if the device is write protected |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | * |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 487 | * The function expects, that the device is already selected |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | */ |
| 489 | static int nand_check_wp (struct mtd_info *mtd) |
| 490 | { |
| 491 | struct nand_chip *this = mtd->priv; |
| 492 | /* Check the WP bit */ |
| 493 | this->cmdfunc (mtd, NAND_CMD_STATUS, -1, -1); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 494 | return (this->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | /** |
| 498 | * nand_block_checkbad - [GENERIC] Check if a block is marked bad |
| 499 | * @mtd: MTD device structure |
| 500 | * @ofs: offset from device start |
| 501 | * @getchip: 0, if the chip is already selected |
| 502 | * @allowbbt: 1, if its allowed to access the bbt area |
| 503 | * |
| 504 | * Check, if the block is bad. Either by reading the bad block table or |
| 505 | * calling of the scan function. |
| 506 | */ |
| 507 | static int nand_block_checkbad (struct mtd_info *mtd, loff_t ofs, int getchip, int allowbbt) |
| 508 | { |
| 509 | struct nand_chip *this = mtd->priv; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | if (!this->bbt) |
| 512 | return this->block_bad(mtd, ofs, getchip); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 513 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | /* Return info from the table */ |
| 515 | return nand_isbad_bbt (mtd, ofs, allowbbt); |
| 516 | } |
| 517 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 518 | /* |
Thomas Gleixner | 3b88775 | 2005-02-22 21:56:49 +0000 | [diff] [blame] | 519 | * Wait for the ready pin, after a command |
| 520 | * The timeout is catched later. |
| 521 | */ |
| 522 | static void nand_wait_ready(struct mtd_info *mtd) |
| 523 | { |
| 524 | struct nand_chip *this = mtd->priv; |
| 525 | unsigned long timeo = jiffies + 2; |
| 526 | |
| 527 | /* wait until command is processed or timeout occures */ |
| 528 | do { |
| 529 | if (this->dev_ready(mtd)) |
| 530 | return; |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 531 | touch_softlockup_watchdog(); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 532 | } while (time_before(jiffies, timeo)); |
Thomas Gleixner | 3b88775 | 2005-02-22 21:56:49 +0000 | [diff] [blame] | 533 | } |
| 534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | /** |
| 536 | * nand_command - [DEFAULT] Send command to NAND device |
| 537 | * @mtd: MTD device structure |
| 538 | * @command: the command to be sent |
| 539 | * @column: the column address for this command, -1 if none |
| 540 | * @page_addr: the page address for this command, -1 if none |
| 541 | * |
| 542 | * Send command to NAND device. This function is used for small page |
| 543 | * devices (256/512 Bytes per page) |
| 544 | */ |
| 545 | static void nand_command (struct mtd_info *mtd, unsigned command, int column, int page_addr) |
| 546 | { |
| 547 | register struct nand_chip *this = mtd->priv; |
| 548 | |
| 549 | /* Begin command latch cycle */ |
| 550 | this->hwcontrol(mtd, NAND_CTL_SETCLE); |
| 551 | /* |
| 552 | * Write out the command to the device. |
| 553 | */ |
| 554 | if (command == NAND_CMD_SEQIN) { |
| 555 | int readcmd; |
| 556 | |
| 557 | if (column >= mtd->oobblock) { |
| 558 | /* OOB area */ |
| 559 | column -= mtd->oobblock; |
| 560 | readcmd = NAND_CMD_READOOB; |
| 561 | } else if (column < 256) { |
| 562 | /* First 256 bytes --> READ0 */ |
| 563 | readcmd = NAND_CMD_READ0; |
| 564 | } else { |
| 565 | column -= 256; |
| 566 | readcmd = NAND_CMD_READ1; |
| 567 | } |
| 568 | this->write_byte(mtd, readcmd); |
| 569 | } |
| 570 | this->write_byte(mtd, command); |
| 571 | |
| 572 | /* Set ALE and clear CLE to start address cycle */ |
| 573 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); |
| 574 | |
| 575 | if (column != -1 || page_addr != -1) { |
| 576 | this->hwcontrol(mtd, NAND_CTL_SETALE); |
| 577 | |
| 578 | /* Serially input address */ |
| 579 | if (column != -1) { |
| 580 | /* Adjust columns for 16 bit buswidth */ |
| 581 | if (this->options & NAND_BUSWIDTH_16) |
| 582 | column >>= 1; |
| 583 | this->write_byte(mtd, column); |
| 584 | } |
| 585 | if (page_addr != -1) { |
| 586 | this->write_byte(mtd, (unsigned char) (page_addr & 0xff)); |
| 587 | this->write_byte(mtd, (unsigned char) ((page_addr >> 8) & 0xff)); |
| 588 | /* One more address cycle for devices > 32MiB */ |
| 589 | if (this->chipsize > (32 << 20)) |
| 590 | this->write_byte(mtd, (unsigned char) ((page_addr >> 16) & 0x0f)); |
| 591 | } |
| 592 | /* Latch in address */ |
| 593 | this->hwcontrol(mtd, NAND_CTL_CLRALE); |
| 594 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 595 | |
| 596 | /* |
| 597 | * program and erase have their own busy handlers |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | * status and sequential in needs no delay |
| 599 | */ |
| 600 | switch (command) { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | case NAND_CMD_PAGEPROG: |
| 603 | case NAND_CMD_ERASE1: |
| 604 | case NAND_CMD_ERASE2: |
| 605 | case NAND_CMD_SEQIN: |
| 606 | case NAND_CMD_STATUS: |
| 607 | return; |
| 608 | |
| 609 | case NAND_CMD_RESET: |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 610 | if (this->dev_ready) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | break; |
| 612 | udelay(this->chip_delay); |
| 613 | this->hwcontrol(mtd, NAND_CTL_SETCLE); |
| 614 | this->write_byte(mtd, NAND_CMD_STATUS); |
| 615 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); |
David A. Marlin | a4ab4c5 | 2005-01-23 18:30:53 +0000 | [diff] [blame] | 616 | while ( !(this->read_byte(mtd) & NAND_STATUS_READY)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | return; |
| 618 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 619 | /* This applies to read commands */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | default: |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 621 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | * If we don't have access to the busy pin, we apply the given |
| 623 | * command delay |
| 624 | */ |
| 625 | if (!this->dev_ready) { |
| 626 | udelay (this->chip_delay); |
| 627 | return; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 628 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | /* Apply this short delay always to ensure that we do wait tWB in |
| 631 | * any case on any machine. */ |
| 632 | ndelay (100); |
Thomas Gleixner | 3b88775 | 2005-02-22 21:56:49 +0000 | [diff] [blame] | 633 | |
| 634 | nand_wait_ready(mtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | /** |
| 638 | * nand_command_lp - [DEFAULT] Send command to NAND large page device |
| 639 | * @mtd: MTD device structure |
| 640 | * @command: the command to be sent |
| 641 | * @column: the column address for this command, -1 if none |
| 642 | * @page_addr: the page address for this command, -1 if none |
| 643 | * |
| 644 | * Send command to NAND device. This is the version for the new large page devices |
| 645 | * We dont have the seperate regions as we have in the small page devices. |
| 646 | * We must emulate NAND_CMD_READOOB to keep the code compatible. |
| 647 | * |
| 648 | */ |
| 649 | static void nand_command_lp (struct mtd_info *mtd, unsigned command, int column, int page_addr) |
| 650 | { |
| 651 | register struct nand_chip *this = mtd->priv; |
| 652 | |
| 653 | /* Emulate NAND_CMD_READOOB */ |
| 654 | if (command == NAND_CMD_READOOB) { |
| 655 | column += mtd->oobblock; |
| 656 | command = NAND_CMD_READ0; |
| 657 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 658 | |
| 659 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | /* Begin command latch cycle */ |
| 661 | this->hwcontrol(mtd, NAND_CTL_SETCLE); |
| 662 | /* Write out the command to the device. */ |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 663 | this->write_byte(mtd, (command & 0xff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | /* End command latch cycle */ |
| 665 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); |
| 666 | |
| 667 | if (column != -1 || page_addr != -1) { |
| 668 | this->hwcontrol(mtd, NAND_CTL_SETALE); |
| 669 | |
| 670 | /* Serially input address */ |
| 671 | if (column != -1) { |
| 672 | /* Adjust columns for 16 bit buswidth */ |
| 673 | if (this->options & NAND_BUSWIDTH_16) |
| 674 | column >>= 1; |
| 675 | this->write_byte(mtd, column & 0xff); |
| 676 | this->write_byte(mtd, column >> 8); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 677 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | if (page_addr != -1) { |
| 679 | this->write_byte(mtd, (unsigned char) (page_addr & 0xff)); |
| 680 | this->write_byte(mtd, (unsigned char) ((page_addr >> 8) & 0xff)); |
| 681 | /* One more address cycle for devices > 128MiB */ |
| 682 | if (this->chipsize > (128 << 20)) |
| 683 | this->write_byte(mtd, (unsigned char) ((page_addr >> 16) & 0xff)); |
| 684 | } |
| 685 | /* Latch in address */ |
| 686 | this->hwcontrol(mtd, NAND_CTL_CLRALE); |
| 687 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 688 | |
| 689 | /* |
| 690 | * program and erase have their own busy handlers |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 691 | * status, sequential in, and deplete1 need no delay |
| 692 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | switch (command) { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 694 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | case NAND_CMD_CACHEDPROG: |
| 696 | case NAND_CMD_PAGEPROG: |
| 697 | case NAND_CMD_ERASE1: |
| 698 | case NAND_CMD_ERASE2: |
| 699 | case NAND_CMD_SEQIN: |
| 700 | case NAND_CMD_STATUS: |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 701 | case NAND_CMD_DEPLETE1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | return; |
| 703 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 704 | /* |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 705 | * read error status commands require only a short delay |
| 706 | */ |
| 707 | case NAND_CMD_STATUS_ERROR: |
| 708 | case NAND_CMD_STATUS_ERROR0: |
| 709 | case NAND_CMD_STATUS_ERROR1: |
| 710 | case NAND_CMD_STATUS_ERROR2: |
| 711 | case NAND_CMD_STATUS_ERROR3: |
| 712 | udelay(this->chip_delay); |
| 713 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
| 715 | case NAND_CMD_RESET: |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 716 | if (this->dev_ready) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | break; |
| 718 | udelay(this->chip_delay); |
| 719 | this->hwcontrol(mtd, NAND_CTL_SETCLE); |
| 720 | this->write_byte(mtd, NAND_CMD_STATUS); |
| 721 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); |
David A. Marlin | a4ab4c5 | 2005-01-23 18:30:53 +0000 | [diff] [blame] | 722 | while ( !(this->read_byte(mtd) & NAND_STATUS_READY)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | return; |
| 724 | |
| 725 | case NAND_CMD_READ0: |
| 726 | /* Begin command latch cycle */ |
| 727 | this->hwcontrol(mtd, NAND_CTL_SETCLE); |
| 728 | /* Write out the start read command */ |
| 729 | this->write_byte(mtd, NAND_CMD_READSTART); |
| 730 | /* End command latch cycle */ |
| 731 | this->hwcontrol(mtd, NAND_CTL_CLRCLE); |
| 732 | /* Fall through into ready check */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 733 | |
| 734 | /* This applies to read commands */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | default: |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 736 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | * If we don't have access to the busy pin, we apply the given |
| 738 | * command delay |
| 739 | */ |
| 740 | if (!this->dev_ready) { |
| 741 | udelay (this->chip_delay); |
| 742 | return; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 743 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | } |
Thomas Gleixner | 3b88775 | 2005-02-22 21:56:49 +0000 | [diff] [blame] | 745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | /* Apply this short delay always to ensure that we do wait tWB in |
| 747 | * any case on any machine. */ |
| 748 | ndelay (100); |
Thomas Gleixner | 3b88775 | 2005-02-22 21:56:49 +0000 | [diff] [blame] | 749 | |
| 750 | nand_wait_ready(mtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | } |
| 752 | |
| 753 | /** |
| 754 | * nand_get_device - [GENERIC] Get chip for selected access |
| 755 | * @this: the nand chip descriptor |
| 756 | * @mtd: MTD device structure |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 757 | * @new_state: the state which is requested |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | * |
| 759 | * Get the device and lock it for exclusive access |
| 760 | */ |
Vitaly Wool | 962034f | 2005-09-15 14:58:53 +0100 | [diff] [blame] | 761 | static int nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | { |
Thomas Gleixner | 0dfc624 | 2005-05-31 20:39:20 +0100 | [diff] [blame] | 763 | struct nand_chip *active; |
| 764 | spinlock_t *lock; |
| 765 | wait_queue_head_t *wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | DECLARE_WAITQUEUE (wait, current); |
| 767 | |
Thomas Gleixner | 0dfc624 | 2005-05-31 20:39:20 +0100 | [diff] [blame] | 768 | lock = (this->controller) ? &this->controller->lock : &this->chip_lock; |
| 769 | wq = (this->controller) ? &this->controller->wq : &this->wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | retry: |
Thomas Gleixner | 0dfc624 | 2005-05-31 20:39:20 +0100 | [diff] [blame] | 771 | active = this; |
| 772 | spin_lock(lock); |
| 773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | /* Hardware controller shared among independend devices */ |
| 775 | if (this->controller) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | if (this->controller->active) |
| 777 | active = this->controller->active; |
| 778 | else |
| 779 | this->controller->active = this; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | } |
Thomas Gleixner | 0dfc624 | 2005-05-31 20:39:20 +0100 | [diff] [blame] | 781 | if (active == this && this->state == FL_READY) { |
| 782 | this->state = new_state; |
| 783 | spin_unlock(lock); |
Vitaly Wool | 962034f | 2005-09-15 14:58:53 +0100 | [diff] [blame] | 784 | return 0; |
| 785 | } |
| 786 | if (new_state == FL_PM_SUSPENDED) { |
| 787 | spin_unlock(lock); |
| 788 | return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN; |
Thomas Gleixner | 0dfc624 | 2005-05-31 20:39:20 +0100 | [diff] [blame] | 789 | } |
| 790 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 791 | add_wait_queue(wq, &wait); |
| 792 | spin_unlock(lock); |
| 793 | schedule(); |
| 794 | remove_wait_queue(wq, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | goto retry; |
| 796 | } |
| 797 | |
| 798 | /** |
| 799 | * nand_wait - [DEFAULT] wait until the command is done |
| 800 | * @mtd: MTD device structure |
| 801 | * @this: NAND chip structure |
| 802 | * @state: state to select the max. timeout value |
| 803 | * |
| 804 | * Wait for command done. This applies to erase and program only |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 805 | * Erase can take up to 400ms and program up to 20ms according to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | * general NAND and SmartMedia specs |
| 807 | * |
| 808 | */ |
| 809 | static int nand_wait(struct mtd_info *mtd, struct nand_chip *this, int state) |
| 810 | { |
| 811 | |
| 812 | unsigned long timeo = jiffies; |
| 813 | int status; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 814 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | if (state == FL_ERASING) |
| 816 | timeo += (HZ * 400) / 1000; |
| 817 | else |
| 818 | timeo += (HZ * 20) / 1000; |
| 819 | |
| 820 | /* Apply this short delay always to ensure that we do wait tWB in |
| 821 | * any case on any machine. */ |
| 822 | ndelay (100); |
| 823 | |
| 824 | if ((state == FL_ERASING) && (this->options & NAND_IS_AND)) |
| 825 | this->cmdfunc (mtd, NAND_CMD_STATUS_MULTI, -1, -1); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 826 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | this->cmdfunc (mtd, NAND_CMD_STATUS, -1, -1); |
| 828 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 829 | while (time_before(jiffies, timeo)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | /* Check, if we were interrupted */ |
| 831 | if (this->state != state) |
| 832 | return 0; |
| 833 | |
| 834 | if (this->dev_ready) { |
| 835 | if (this->dev_ready(mtd)) |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 836 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | } else { |
| 838 | if (this->read_byte(mtd) & NAND_STATUS_READY) |
| 839 | break; |
| 840 | } |
Thomas Gleixner | 20a6c21 | 2005-03-01 09:32:48 +0000 | [diff] [blame] | 841 | cond_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | } |
| 843 | status = (int) this->read_byte(mtd); |
| 844 | return status; |
| 845 | } |
| 846 | |
| 847 | /** |
| 848 | * nand_write_page - [GENERIC] write one page |
| 849 | * @mtd: MTD device structure |
| 850 | * @this: NAND chip structure |
| 851 | * @page: startpage inside the chip, must be called with (page & this->pagemask) |
| 852 | * @oob_buf: out of band data buffer |
| 853 | * @oobsel: out of band selecttion structre |
| 854 | * @cached: 1 = enable cached programming if supported by chip |
| 855 | * |
| 856 | * Nand_page_program function is used for write and writev ! |
| 857 | * This function will always program a full page of data |
| 858 | * If you call it with a non page aligned buffer, you're lost :) |
| 859 | * |
| 860 | * Cached programming is not supported yet. |
| 861 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 862 | static int nand_write_page (struct mtd_info *mtd, struct nand_chip *this, int page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | u_char *oob_buf, struct nand_oobinfo *oobsel, int cached) |
| 864 | { |
| 865 | int i, status; |
Jarkko Lavinen | 0a18cde | 2005-04-11 15:16:11 +0100 | [diff] [blame] | 866 | u_char ecc_code[32]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | int eccmode = oobsel->useecc ? this->eccmode : NAND_ECC_NONE; |
| 868 | int *oob_config = oobsel->eccpos; |
| 869 | int datidx = 0, eccidx = 0, eccsteps = this->eccsteps; |
| 870 | int eccbytes = 0; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | /* FIXME: Enable cached programming */ |
| 873 | cached = 0; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 874 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | /* Send command to begin auto page programming */ |
| 876 | this->cmdfunc (mtd, NAND_CMD_SEQIN, 0x00, page); |
| 877 | |
| 878 | /* Write out complete page of data, take care of eccmode */ |
| 879 | switch (eccmode) { |
| 880 | /* No ecc, write all */ |
| 881 | case NAND_ECC_NONE: |
| 882 | printk (KERN_WARNING "Writing data without ECC to NAND-FLASH is not recommended\n"); |
| 883 | this->write_buf(mtd, this->data_poi, mtd->oobblock); |
| 884 | break; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | /* Software ecc 3/256, write all */ |
| 887 | case NAND_ECC_SOFT: |
| 888 | for (; eccsteps; eccsteps--) { |
| 889 | this->calculate_ecc(mtd, &this->data_poi[datidx], ecc_code); |
| 890 | for (i = 0; i < 3; i++, eccidx++) |
| 891 | oob_buf[oob_config[eccidx]] = ecc_code[i]; |
| 892 | datidx += this->eccsize; |
| 893 | } |
| 894 | this->write_buf(mtd, this->data_poi, mtd->oobblock); |
| 895 | break; |
| 896 | default: |
| 897 | eccbytes = this->eccbytes; |
| 898 | for (; eccsteps; eccsteps--) { |
| 899 | /* enable hardware ecc logic for write */ |
| 900 | this->enable_hwecc(mtd, NAND_ECC_WRITE); |
| 901 | this->write_buf(mtd, &this->data_poi[datidx], this->eccsize); |
| 902 | this->calculate_ecc(mtd, &this->data_poi[datidx], ecc_code); |
| 903 | for (i = 0; i < eccbytes; i++, eccidx++) |
| 904 | oob_buf[oob_config[eccidx]] = ecc_code[i]; |
| 905 | /* If the hardware ecc provides syndromes then |
| 906 | * the ecc code must be written immidiately after |
| 907 | * the data bytes (words) */ |
| 908 | if (this->options & NAND_HWECC_SYNDROME) |
| 909 | this->write_buf(mtd, ecc_code, eccbytes); |
| 910 | datidx += this->eccsize; |
| 911 | } |
| 912 | break; |
| 913 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 914 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | /* Write out OOB data */ |
| 916 | if (this->options & NAND_HWECC_SYNDROME) |
| 917 | this->write_buf(mtd, &oob_buf[oobsel->eccbytes], mtd->oobsize - oobsel->eccbytes); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 918 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | this->write_buf(mtd, oob_buf, mtd->oobsize); |
| 920 | |
| 921 | /* Send command to actually program the data */ |
| 922 | this->cmdfunc (mtd, cached ? NAND_CMD_CACHEDPROG : NAND_CMD_PAGEPROG, -1, -1); |
| 923 | |
| 924 | if (!cached) { |
| 925 | /* call wait ready function */ |
| 926 | status = this->waitfunc (mtd, this, FL_WRITING); |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 927 | |
| 928 | /* See if operation failed and additional status checks are available */ |
| 929 | if ((status & NAND_STATUS_FAIL) && (this->errstat)) { |
| 930 | status = this->errstat(mtd, this, FL_WRITING, status, page); |
| 931 | } |
| 932 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | /* See if device thinks it succeeded */ |
David A. Marlin | a4ab4c5 | 2005-01-23 18:30:53 +0000 | [diff] [blame] | 934 | if (status & NAND_STATUS_FAIL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | DEBUG (MTD_DEBUG_LEVEL0, "%s: " "Failed write, page 0x%08x, ", __FUNCTION__, page); |
| 936 | return -EIO; |
| 937 | } |
| 938 | } else { |
| 939 | /* FIXME: Implement cached programming ! */ |
| 940 | /* wait until cache is ready*/ |
| 941 | // status = this->waitfunc (mtd, this, FL_CACHEDRPG); |
| 942 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 943 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
| 945 | |
| 946 | #ifdef CONFIG_MTD_NAND_VERIFY_WRITE |
| 947 | /** |
| 948 | * nand_verify_pages - [GENERIC] verify the chip contents after a write |
| 949 | * @mtd: MTD device structure |
| 950 | * @this: NAND chip structure |
| 951 | * @page: startpage inside the chip, must be called with (page & this->pagemask) |
| 952 | * @numpages: number of pages to verify |
| 953 | * @oob_buf: out of band data buffer |
| 954 | * @oobsel: out of band selecttion structre |
| 955 | * @chipnr: number of the current chip |
| 956 | * @oobmode: 1 = full buffer verify, 0 = ecc only |
| 957 | * |
| 958 | * The NAND device assumes that it is always writing to a cleanly erased page. |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 959 | * Hence, it performs its internal write verification only on bits that |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | * transitioned from 1 to 0. The device does NOT verify the whole page on a |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 961 | * byte by byte basis. It is possible that the page was not completely erased |
| 962 | * or the page is becoming unusable due to wear. The read with ECC would catch |
| 963 | * the error later when the ECC page check fails, but we would rather catch |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | * it early in the page write stage. Better to write no data than invalid data. |
| 965 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 966 | static int nand_verify_pages (struct mtd_info *mtd, struct nand_chip *this, int page, int numpages, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | u_char *oob_buf, struct nand_oobinfo *oobsel, int chipnr, int oobmode) |
| 968 | { |
| 969 | int i, j, datidx = 0, oobofs = 0, res = -EIO; |
| 970 | int eccsteps = this->eccsteps; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 971 | int hweccbytes; |
Jarkko Lavinen | 0a18cde | 2005-04-11 15:16:11 +0100 | [diff] [blame] | 972 | u_char oobdata[64]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
| 974 | hweccbytes = (this->options & NAND_HWECC_SYNDROME) ? (oobsel->eccbytes / eccsteps) : 0; |
| 975 | |
| 976 | /* Send command to read back the first page */ |
| 977 | this->cmdfunc (mtd, NAND_CMD_READ0, 0, page); |
| 978 | |
| 979 | for(;;) { |
| 980 | for (j = 0; j < eccsteps; j++) { |
| 981 | /* Loop through and verify the data */ |
| 982 | if (this->verify_buf(mtd, &this->data_poi[datidx], mtd->eccsize)) { |
| 983 | DEBUG (MTD_DEBUG_LEVEL0, "%s: " "Failed write verify, page 0x%08x ", __FUNCTION__, page); |
| 984 | goto out; |
| 985 | } |
| 986 | datidx += mtd->eccsize; |
| 987 | /* Have we a hw generator layout ? */ |
| 988 | if (!hweccbytes) |
| 989 | continue; |
| 990 | if (this->verify_buf(mtd, &this->oob_buf[oobofs], hweccbytes)) { |
| 991 | DEBUG (MTD_DEBUG_LEVEL0, "%s: " "Failed write verify, page 0x%08x ", __FUNCTION__, page); |
| 992 | goto out; |
| 993 | } |
| 994 | oobofs += hweccbytes; |
| 995 | } |
| 996 | |
| 997 | /* check, if we must compare all data or if we just have to |
| 998 | * compare the ecc bytes |
| 999 | */ |
| 1000 | if (oobmode) { |
| 1001 | if (this->verify_buf(mtd, &oob_buf[oobofs], mtd->oobsize - hweccbytes * eccsteps)) { |
| 1002 | DEBUG (MTD_DEBUG_LEVEL0, "%s: " "Failed write verify, page 0x%08x ", __FUNCTION__, page); |
| 1003 | goto out; |
| 1004 | } |
| 1005 | } else { |
| 1006 | /* Read always, else autoincrement fails */ |
| 1007 | this->read_buf(mtd, oobdata, mtd->oobsize - hweccbytes * eccsteps); |
| 1008 | |
| 1009 | if (oobsel->useecc != MTD_NANDECC_OFF && !hweccbytes) { |
| 1010 | int ecccnt = oobsel->eccbytes; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1011 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | for (i = 0; i < ecccnt; i++) { |
| 1013 | int idx = oobsel->eccpos[i]; |
| 1014 | if (oobdata[idx] != oob_buf[oobofs + idx] ) { |
| 1015 | DEBUG (MTD_DEBUG_LEVEL0, |
| 1016 | "%s: Failed ECC write " |
| 1017 | "verify, page 0x%08x, " "%6i bytes were succesful\n", __FUNCTION__, page, i); |
| 1018 | goto out; |
| 1019 | } |
| 1020 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1021 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | } |
| 1023 | oobofs += mtd->oobsize - hweccbytes * eccsteps; |
| 1024 | page++; |
| 1025 | numpages--; |
| 1026 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1027 | /* Apply delay or wait for ready/busy pin |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | * Do this before the AUTOINCR check, so no problems |
| 1029 | * arise if a chip which does auto increment |
| 1030 | * is marked as NOAUTOINCR by the board driver. |
| 1031 | * Do this also before returning, so the chip is |
| 1032 | * ready for the next command. |
| 1033 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1034 | if (!this->dev_ready) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | udelay (this->chip_delay); |
| 1036 | else |
Thomas Gleixner | 3b88775 | 2005-02-22 21:56:49 +0000 | [diff] [blame] | 1037 | nand_wait_ready(mtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
| 1039 | /* All done, return happy */ |
| 1040 | if (!numpages) |
| 1041 | return 0; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1042 | |
| 1043 | |
| 1044 | /* Check, if the chip supports auto page increment */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | if (!NAND_CANAUTOINCR(this)) |
| 1046 | this->cmdfunc (mtd, NAND_CMD_READ0, 0x00, page); |
| 1047 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1048 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | * Terminate the read command. We come here in case of an error |
| 1050 | * So we must issue a reset command. |
| 1051 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1052 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | this->cmdfunc (mtd, NAND_CMD_RESET, -1, -1); |
| 1054 | return res; |
| 1055 | } |
| 1056 | #endif |
| 1057 | |
| 1058 | /** |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 1059 | * nand_read - [MTD Interface] MTD compability function for nand_do_read_ecc |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | * @mtd: MTD device structure |
| 1061 | * @from: offset to read from |
| 1062 | * @len: number of bytes to read |
| 1063 | * @retlen: pointer to variable to store the number of read bytes |
| 1064 | * @buf: the databuffer to put data |
| 1065 | * |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 1066 | * This function simply calls nand_do_read_ecc with oob buffer and oobsel = NULL |
| 1067 | * and flags = 0xff |
| 1068 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | static int nand_read (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf) |
| 1070 | { |
Thomas Gleixner | 22c60f5 | 2005-04-04 19:56:32 +0100 | [diff] [blame] | 1071 | return nand_do_read_ecc (mtd, from, len, retlen, buf, NULL, &mtd->oobinfo, 0xff); |
| 1072 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | |
| 1074 | |
| 1075 | /** |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 1076 | * nand_read_ecc - [MTD Interface] MTD compability function for nand_do_read_ecc |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | * @mtd: MTD device structure |
| 1078 | * @from: offset to read from |
| 1079 | * @len: number of bytes to read |
| 1080 | * @retlen: pointer to variable to store the number of read bytes |
| 1081 | * @buf: the databuffer to put data |
| 1082 | * @oob_buf: filesystem supplied oob data buffer |
| 1083 | * @oobsel: oob selection structure |
| 1084 | * |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 1085 | * This function simply calls nand_do_read_ecc with flags = 0xff |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | */ |
| 1087 | static int nand_read_ecc (struct mtd_info *mtd, loff_t from, size_t len, |
| 1088 | size_t * retlen, u_char * buf, u_char * oob_buf, struct nand_oobinfo *oobsel) |
| 1089 | { |
Thomas Gleixner | 22c60f5 | 2005-04-04 19:56:32 +0100 | [diff] [blame] | 1090 | /* use userspace supplied oobinfo, if zero */ |
| 1091 | if (oobsel == NULL) |
| 1092 | oobsel = &mtd->oobinfo; |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 1093 | return nand_do_read_ecc(mtd, from, len, retlen, buf, oob_buf, oobsel, 0xff); |
| 1094 | } |
| 1095 | |
| 1096 | |
| 1097 | /** |
| 1098 | * nand_do_read_ecc - [MTD Interface] Read data with ECC |
| 1099 | * @mtd: MTD device structure |
| 1100 | * @from: offset to read from |
| 1101 | * @len: number of bytes to read |
| 1102 | * @retlen: pointer to variable to store the number of read bytes |
| 1103 | * @buf: the databuffer to put data |
Dan Brown | bb75ba4 | 2005-04-04 19:02:26 +0100 | [diff] [blame] | 1104 | * @oob_buf: filesystem supplied oob data buffer (can be NULL) |
Thomas Gleixner | 22c60f5 | 2005-04-04 19:56:32 +0100 | [diff] [blame] | 1105 | * @oobsel: oob selection structure |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 1106 | * @flags: flag to indicate if nand_get_device/nand_release_device should be preformed |
| 1107 | * and how many corrected error bits are acceptable: |
| 1108 | * bits 0..7 - number of tolerable errors |
| 1109 | * bit 8 - 0 == do not get/release chip, 1 == get/release chip |
| 1110 | * |
| 1111 | * NAND read with ECC |
| 1112 | */ |
| 1113 | int nand_do_read_ecc (struct mtd_info *mtd, loff_t from, size_t len, |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1114 | size_t * retlen, u_char * buf, u_char * oob_buf, |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 1115 | struct nand_oobinfo *oobsel, int flags) |
| 1116 | { |
Thomas Gleixner | 22c60f5 | 2005-04-04 19:56:32 +0100 | [diff] [blame] | 1117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | int i, j, col, realpage, page, end, ecc, chipnr, sndcmd = 1; |
| 1119 | int read = 0, oob = 0, ecc_status = 0, ecc_failed = 0; |
| 1120 | struct nand_chip *this = mtd->priv; |
| 1121 | u_char *data_poi, *oob_data = oob_buf; |
Jarkko Lavinen | 0a18cde | 2005-04-11 15:16:11 +0100 | [diff] [blame] | 1122 | u_char ecc_calc[32]; |
| 1123 | u_char ecc_code[32]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | int eccmode, eccsteps; |
| 1125 | int *oob_config, datidx; |
| 1126 | int blockcheck = (1 << (this->phys_erase_shift - this->page_shift)) - 1; |
| 1127 | int eccbytes; |
| 1128 | int compareecc = 1; |
| 1129 | int oobreadlen; |
| 1130 | |
| 1131 | |
| 1132 | DEBUG (MTD_DEBUG_LEVEL3, "nand_read_ecc: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len); |
| 1133 | |
| 1134 | /* Do not allow reads past end of device */ |
| 1135 | if ((from + len) > mtd->size) { |
| 1136 | DEBUG (MTD_DEBUG_LEVEL0, "nand_read_ecc: Attempt read beyond end of device\n"); |
| 1137 | *retlen = 0; |
| 1138 | return -EINVAL; |
| 1139 | } |
| 1140 | |
| 1141 | /* Grab the lock and see if the device is available */ |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 1142 | if (flags & NAND_GET_DEVICE) |
| 1143 | nand_get_device (this, mtd, FL_READING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | /* Autoplace of oob data ? Use the default placement scheme */ |
| 1146 | if (oobsel->useecc == MTD_NANDECC_AUTOPLACE) |
| 1147 | oobsel = this->autooob; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | eccmode = oobsel->useecc ? this->eccmode : NAND_ECC_NONE; |
| 1150 | oob_config = oobsel->eccpos; |
| 1151 | |
| 1152 | /* Select the NAND device */ |
| 1153 | chipnr = (int)(from >> this->chip_shift); |
| 1154 | this->select_chip(mtd, chipnr); |
| 1155 | |
| 1156 | /* First we calculate the starting page */ |
| 1157 | realpage = (int) (from >> this->page_shift); |
| 1158 | page = realpage & this->pagemask; |
| 1159 | |
| 1160 | /* Get raw starting column */ |
| 1161 | col = from & (mtd->oobblock - 1); |
| 1162 | |
| 1163 | end = mtd->oobblock; |
| 1164 | ecc = this->eccsize; |
| 1165 | eccbytes = this->eccbytes; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | if ((eccmode == NAND_ECC_NONE) || (this->options & NAND_HWECC_SYNDROME)) |
| 1168 | compareecc = 0; |
| 1169 | |
| 1170 | oobreadlen = mtd->oobsize; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1171 | if (this->options & NAND_HWECC_SYNDROME) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | oobreadlen -= oobsel->eccbytes; |
| 1173 | |
| 1174 | /* Loop until all data read */ |
| 1175 | while (read < len) { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | int aligned = (!col && (len - read) >= end); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1178 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | * If the read is not page aligned, we have to read into data buffer |
| 1180 | * due to ecc, else we read into return buffer direct |
| 1181 | */ |
| 1182 | if (aligned) |
| 1183 | data_poi = &buf[read]; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1184 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | data_poi = this->data_buf; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1186 | |
| 1187 | /* Check, if we have this page in the buffer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | * |
| 1189 | * FIXME: Make it work when we must provide oob data too, |
| 1190 | * check the usage of data_buf oob field |
| 1191 | */ |
| 1192 | if (realpage == this->pagebuf && !oob_buf) { |
| 1193 | /* aligned read ? */ |
| 1194 | if (aligned) |
| 1195 | memcpy (data_poi, this->data_buf, end); |
| 1196 | goto readdata; |
| 1197 | } |
| 1198 | |
| 1199 | /* Check, if we must send the read command */ |
| 1200 | if (sndcmd) { |
| 1201 | this->cmdfunc (mtd, NAND_CMD_READ0, 0x00, page); |
| 1202 | sndcmd = 0; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1203 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | |
| 1205 | /* get oob area, if we have no oob buffer from fs-driver */ |
Thomas Gleixner | 90e260c | 2005-05-19 17:10:26 +0100 | [diff] [blame] | 1206 | if (!oob_buf || oobsel->useecc == MTD_NANDECC_AUTOPLACE || |
| 1207 | oobsel->useecc == MTD_NANDECC_AUTOPL_USR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | oob_data = &this->data_buf[end]; |
| 1209 | |
| 1210 | eccsteps = this->eccsteps; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1211 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | switch (eccmode) { |
| 1213 | case NAND_ECC_NONE: { /* No ECC, Read in a page */ |
| 1214 | static unsigned long lastwhinge = 0; |
| 1215 | if ((lastwhinge / HZ) != (jiffies / HZ)) { |
| 1216 | printk (KERN_WARNING "Reading data from NAND FLASH without ECC is not recommended\n"); |
| 1217 | lastwhinge = jiffies; |
| 1218 | } |
| 1219 | this->read_buf(mtd, data_poi, end); |
| 1220 | break; |
| 1221 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1222 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | case NAND_ECC_SOFT: /* Software ECC 3/256: Read in a page + oob data */ |
| 1224 | this->read_buf(mtd, data_poi, end); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1225 | for (i = 0, datidx = 0; eccsteps; eccsteps--, i+=3, datidx += ecc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | this->calculate_ecc(mtd, &data_poi[datidx], &ecc_calc[i]); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1227 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | |
| 1229 | default: |
| 1230 | for (i = 0, datidx = 0; eccsteps; eccsteps--, i+=eccbytes, datidx += ecc) { |
| 1231 | this->enable_hwecc(mtd, NAND_ECC_READ); |
| 1232 | this->read_buf(mtd, &data_poi[datidx], ecc); |
| 1233 | |
| 1234 | /* HW ecc with syndrome calculation must read the |
| 1235 | * syndrome from flash immidiately after the data */ |
| 1236 | if (!compareecc) { |
| 1237 | /* Some hw ecc generators need to know when the |
| 1238 | * syndrome is read from flash */ |
| 1239 | this->enable_hwecc(mtd, NAND_ECC_READSYN); |
| 1240 | this->read_buf(mtd, &oob_data[i], eccbytes); |
| 1241 | /* We calc error correction directly, it checks the hw |
| 1242 | * generator for an error, reads back the syndrome and |
| 1243 | * does the error correction on the fly */ |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 1244 | ecc_status = this->correct_data(mtd, &data_poi[datidx], &oob_data[i], &ecc_code[i]); |
| 1245 | if ((ecc_status == -1) || (ecc_status > (flags && 0xff))) { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1246 | DEBUG (MTD_DEBUG_LEVEL0, "nand_read_ecc: " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | "Failed ECC read, page 0x%08x on chip %d\n", page, chipnr); |
| 1248 | ecc_failed++; |
| 1249 | } |
| 1250 | } else { |
| 1251 | this->calculate_ecc(mtd, &data_poi[datidx], &ecc_calc[i]); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1252 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1254 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | } |
| 1256 | |
| 1257 | /* read oobdata */ |
| 1258 | this->read_buf(mtd, &oob_data[mtd->oobsize - oobreadlen], oobreadlen); |
| 1259 | |
| 1260 | /* Skip ECC check, if not requested (ECC_NONE or HW_ECC with syndromes) */ |
| 1261 | if (!compareecc) |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1262 | goto readoob; |
| 1263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | /* Pick the ECC bytes out of the oob data */ |
| 1265 | for (j = 0; j < oobsel->eccbytes; j++) |
| 1266 | ecc_code[j] = oob_data[oob_config[j]]; |
| 1267 | |
| 1268 | /* correct data, if neccecary */ |
| 1269 | for (i = 0, j = 0, datidx = 0; i < this->eccsteps; i++, datidx += ecc) { |
| 1270 | ecc_status = this->correct_data(mtd, &data_poi[datidx], &ecc_code[j], &ecc_calc[j]); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | /* Get next chunk of ecc bytes */ |
| 1273 | j += eccbytes; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1274 | |
| 1275 | /* Check, if we have a fs supplied oob-buffer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | * This is the legacy mode. Used by YAFFS1 |
| 1277 | * Should go away some day |
| 1278 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1279 | if (oob_buf && oobsel->useecc == MTD_NANDECC_PLACE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | int *p = (int *)(&oob_data[mtd->oobsize]); |
| 1281 | p[i] = ecc_status; |
| 1282 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1283 | |
| 1284 | if ((ecc_status == -1) || (ecc_status > (flags && 0xff))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | DEBUG (MTD_DEBUG_LEVEL0, "nand_read_ecc: " "Failed ECC read, page 0x%08x\n", page); |
| 1286 | ecc_failed++; |
| 1287 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1288 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | |
| 1290 | readoob: |
| 1291 | /* check, if we have a fs supplied oob-buffer */ |
| 1292 | if (oob_buf) { |
| 1293 | /* without autoplace. Legacy mode used by YAFFS1 */ |
| 1294 | switch(oobsel->useecc) { |
| 1295 | case MTD_NANDECC_AUTOPLACE: |
Thomas Gleixner | 90e260c | 2005-05-19 17:10:26 +0100 | [diff] [blame] | 1296 | case MTD_NANDECC_AUTOPL_USR: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | /* Walk through the autoplace chunks */ |
Dan Brown | 82e1d19 | 2005-04-06 21:13:09 +0100 | [diff] [blame] | 1298 | for (i = 0; oobsel->oobfree[i][1]; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | int from = oobsel->oobfree[i][0]; |
| 1300 | int num = oobsel->oobfree[i][1]; |
| 1301 | memcpy(&oob_buf[oob], &oob_data[from], num); |
Dan Brown | 82e1d19 | 2005-04-06 21:13:09 +0100 | [diff] [blame] | 1302 | oob += num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | break; |
| 1305 | case MTD_NANDECC_PLACE: |
| 1306 | /* YAFFS1 legacy mode */ |
| 1307 | oob_data += this->eccsteps * sizeof (int); |
| 1308 | default: |
| 1309 | oob_data += mtd->oobsize; |
| 1310 | } |
| 1311 | } |
| 1312 | readdata: |
| 1313 | /* Partial page read, transfer data into fs buffer */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1314 | if (!aligned) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | for (j = col; j < end && read < len; j++) |
| 1316 | buf[read++] = data_poi[j]; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1317 | this->pagebuf = realpage; |
| 1318 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | read += mtd->oobblock; |
| 1320 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1321 | /* Apply delay or wait for ready/busy pin |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | * Do this before the AUTOINCR check, so no problems |
| 1323 | * arise if a chip which does auto increment |
| 1324 | * is marked as NOAUTOINCR by the board driver. |
| 1325 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1326 | if (!this->dev_ready) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | udelay (this->chip_delay); |
| 1328 | else |
Thomas Gleixner | 3b88775 | 2005-02-22 21:56:49 +0000 | [diff] [blame] | 1329 | nand_wait_ready(mtd); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | if (read == len) |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1332 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | |
| 1334 | /* For subsequent reads align to page boundary. */ |
| 1335 | col = 0; |
| 1336 | /* Increment page address */ |
| 1337 | realpage++; |
| 1338 | |
| 1339 | page = realpage & this->pagemask; |
| 1340 | /* Check, if we cross a chip boundary */ |
| 1341 | if (!page) { |
| 1342 | chipnr++; |
| 1343 | this->select_chip(mtd, -1); |
| 1344 | this->select_chip(mtd, chipnr); |
| 1345 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1346 | /* Check, if the chip supports auto page increment |
| 1347 | * or if we have hit a block boundary. |
| 1348 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | if (!NAND_CANAUTOINCR(this) || !(page & blockcheck)) |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1350 | sndcmd = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | } |
| 1352 | |
| 1353 | /* Deselect and wake up anyone waiting on the device */ |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 1354 | if (flags & NAND_GET_DEVICE) |
| 1355 | nand_release_device(mtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | |
| 1357 | /* |
| 1358 | * Return success, if no ECC failures, else -EBADMSG |
| 1359 | * fs driver will take care of that, because |
| 1360 | * retlen == desired len and result == -EBADMSG |
| 1361 | */ |
| 1362 | *retlen = read; |
| 1363 | return ecc_failed ? -EBADMSG : 0; |
| 1364 | } |
| 1365 | |
| 1366 | /** |
| 1367 | * nand_read_oob - [MTD Interface] NAND read out-of-band |
| 1368 | * @mtd: MTD device structure |
| 1369 | * @from: offset to read from |
| 1370 | * @len: number of bytes to read |
| 1371 | * @retlen: pointer to variable to store the number of read bytes |
| 1372 | * @buf: the databuffer to put data |
| 1373 | * |
| 1374 | * NAND read out-of-band data from the spare area |
| 1375 | */ |
| 1376 | static int nand_read_oob (struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf) |
| 1377 | { |
| 1378 | int i, col, page, chipnr; |
| 1379 | struct nand_chip *this = mtd->priv; |
| 1380 | int blockcheck = (1 << (this->phys_erase_shift - this->page_shift)) - 1; |
| 1381 | |
| 1382 | DEBUG (MTD_DEBUG_LEVEL3, "nand_read_oob: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len); |
| 1383 | |
| 1384 | /* Shift to get page */ |
| 1385 | page = (int)(from >> this->page_shift); |
| 1386 | chipnr = (int)(from >> this->chip_shift); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | /* Mask to get column */ |
| 1389 | col = from & (mtd->oobsize - 1); |
| 1390 | |
| 1391 | /* Initialize return length value */ |
| 1392 | *retlen = 0; |
| 1393 | |
| 1394 | /* Do not allow reads past end of device */ |
| 1395 | if ((from + len) > mtd->size) { |
| 1396 | DEBUG (MTD_DEBUG_LEVEL0, "nand_read_oob: Attempt read beyond end of device\n"); |
| 1397 | *retlen = 0; |
| 1398 | return -EINVAL; |
| 1399 | } |
| 1400 | |
| 1401 | /* Grab the lock and see if the device is available */ |
| 1402 | nand_get_device (this, mtd , FL_READING); |
| 1403 | |
| 1404 | /* Select the NAND device */ |
| 1405 | this->select_chip(mtd, chipnr); |
| 1406 | |
| 1407 | /* Send the read command */ |
| 1408 | this->cmdfunc (mtd, NAND_CMD_READOOB, col, page & this->pagemask); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1409 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | * Read the data, if we read more than one page |
| 1411 | * oob data, let the device transfer the data ! |
| 1412 | */ |
| 1413 | i = 0; |
| 1414 | while (i < len) { |
| 1415 | int thislen = mtd->oobsize - col; |
| 1416 | thislen = min_t(int, thislen, len); |
| 1417 | this->read_buf(mtd, &buf[i], thislen); |
| 1418 | i += thislen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | |
| 1420 | /* Read more ? */ |
| 1421 | if (i < len) { |
| 1422 | page++; |
| 1423 | col = 0; |
| 1424 | |
| 1425 | /* Check, if we cross a chip boundary */ |
| 1426 | if (!(page & this->pagemask)) { |
| 1427 | chipnr++; |
| 1428 | this->select_chip(mtd, -1); |
| 1429 | this->select_chip(mtd, chipnr); |
| 1430 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1431 | |
| 1432 | /* Apply delay or wait for ready/busy pin |
Thomas Gleixner | 19870da | 2005-07-15 14:53:51 +0100 | [diff] [blame] | 1433 | * Do this before the AUTOINCR check, so no problems |
| 1434 | * arise if a chip which does auto increment |
| 1435 | * is marked as NOAUTOINCR by the board driver. |
| 1436 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1437 | if (!this->dev_ready) |
Thomas Gleixner | 19870da | 2005-07-15 14:53:51 +0100 | [diff] [blame] | 1438 | udelay (this->chip_delay); |
| 1439 | else |
| 1440 | nand_wait_ready(mtd); |
| 1441 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1442 | /* Check, if the chip supports auto page increment |
| 1443 | * or if we have hit a block boundary. |
| 1444 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | if (!NAND_CANAUTOINCR(this) || !(page & blockcheck)) { |
| 1446 | /* For subsequent page reads set offset to 0 */ |
| 1447 | this->cmdfunc (mtd, NAND_CMD_READOOB, 0x0, page & this->pagemask); |
| 1448 | } |
| 1449 | } |
| 1450 | } |
| 1451 | |
| 1452 | /* Deselect and wake up anyone waiting on the device */ |
| 1453 | nand_release_device(mtd); |
| 1454 | |
| 1455 | /* Return happy */ |
| 1456 | *retlen = len; |
| 1457 | return 0; |
| 1458 | } |
| 1459 | |
| 1460 | /** |
| 1461 | * nand_read_raw - [GENERIC] Read raw data including oob into buffer |
| 1462 | * @mtd: MTD device structure |
| 1463 | * @buf: temporary buffer |
| 1464 | * @from: offset to read from |
| 1465 | * @len: number of bytes to read |
| 1466 | * @ooblen: number of oob data bytes to read |
| 1467 | * |
| 1468 | * Read raw data including oob into buffer |
| 1469 | */ |
| 1470 | int nand_read_raw (struct mtd_info *mtd, uint8_t *buf, loff_t from, size_t len, size_t ooblen) |
| 1471 | { |
| 1472 | struct nand_chip *this = mtd->priv; |
| 1473 | int page = (int) (from >> this->page_shift); |
| 1474 | int chip = (int) (from >> this->chip_shift); |
| 1475 | int sndcmd = 1; |
| 1476 | int cnt = 0; |
| 1477 | int pagesize = mtd->oobblock + mtd->oobsize; |
| 1478 | int blockcheck = (1 << (this->phys_erase_shift - this->page_shift)) - 1; |
| 1479 | |
| 1480 | /* Do not allow reads past end of device */ |
| 1481 | if ((from + len) > mtd->size) { |
| 1482 | DEBUG (MTD_DEBUG_LEVEL0, "nand_read_raw: Attempt read beyond end of device\n"); |
| 1483 | return -EINVAL; |
| 1484 | } |
| 1485 | |
| 1486 | /* Grab the lock and see if the device is available */ |
| 1487 | nand_get_device (this, mtd , FL_READING); |
| 1488 | |
| 1489 | this->select_chip (mtd, chip); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1490 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | /* Add requested oob length */ |
| 1492 | len += ooblen; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1493 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | while (len) { |
| 1495 | if (sndcmd) |
| 1496 | this->cmdfunc (mtd, NAND_CMD_READ0, 0, page & this->pagemask); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1497 | sndcmd = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | |
| 1499 | this->read_buf (mtd, &buf[cnt], pagesize); |
| 1500 | |
| 1501 | len -= pagesize; |
| 1502 | cnt += pagesize; |
| 1503 | page++; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1504 | |
| 1505 | if (!this->dev_ready) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | udelay (this->chip_delay); |
| 1507 | else |
Thomas Gleixner | 3b88775 | 2005-02-22 21:56:49 +0000 | [diff] [blame] | 1508 | nand_wait_ready(mtd); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1509 | |
| 1510 | /* Check, if the chip supports auto page increment */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | if (!NAND_CANAUTOINCR(this) || !(page & blockcheck)) |
| 1512 | sndcmd = 1; |
| 1513 | } |
| 1514 | |
| 1515 | /* Deselect and wake up anyone waiting on the device */ |
| 1516 | nand_release_device(mtd); |
| 1517 | return 0; |
| 1518 | } |
| 1519 | |
| 1520 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1521 | /** |
| 1522 | * nand_prepare_oobbuf - [GENERIC] Prepare the out of band buffer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | * @mtd: MTD device structure |
| 1524 | * @fsbuf: buffer given by fs driver |
| 1525 | * @oobsel: out of band selection structre |
| 1526 | * @autoplace: 1 = place given buffer into the oob bytes |
| 1527 | * @numpages: number of pages to prepare |
| 1528 | * |
| 1529 | * Return: |
| 1530 | * 1. Filesystem buffer available and autoplacement is off, |
| 1531 | * return filesystem buffer |
| 1532 | * 2. No filesystem buffer or autoplace is off, return internal |
| 1533 | * buffer |
| 1534 | * 3. Filesystem buffer is given and autoplace selected |
| 1535 | * put data from fs buffer into internal buffer and |
| 1536 | * retrun internal buffer |
| 1537 | * |
| 1538 | * Note: The internal buffer is filled with 0xff. This must |
| 1539 | * be done only once, when no autoplacement happens |
| 1540 | * Autoplacement sets the buffer dirty flag, which |
| 1541 | * forces the 0xff fill before using the buffer again. |
| 1542 | * |
| 1543 | */ |
| 1544 | static u_char * nand_prepare_oobbuf (struct mtd_info *mtd, u_char *fsbuf, struct nand_oobinfo *oobsel, |
| 1545 | int autoplace, int numpages) |
| 1546 | { |
| 1547 | struct nand_chip *this = mtd->priv; |
| 1548 | int i, len, ofs; |
| 1549 | |
| 1550 | /* Zero copy fs supplied buffer */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1551 | if (fsbuf && !autoplace) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | return fsbuf; |
| 1553 | |
| 1554 | /* Check, if the buffer must be filled with ff again */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1555 | if (this->oobdirty) { |
| 1556 | memset (this->oob_buf, 0xff, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | mtd->oobsize << (this->phys_erase_shift - this->page_shift)); |
| 1558 | this->oobdirty = 0; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1559 | } |
| 1560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | /* If we have no autoplacement or no fs buffer use the internal one */ |
| 1562 | if (!autoplace || !fsbuf) |
| 1563 | return this->oob_buf; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | /* Walk through the pages and place the data */ |
| 1566 | this->oobdirty = 1; |
| 1567 | ofs = 0; |
| 1568 | while (numpages--) { |
| 1569 | for (i = 0, len = 0; len < mtd->oobavail; i++) { |
| 1570 | int to = ofs + oobsel->oobfree[i][0]; |
| 1571 | int num = oobsel->oobfree[i][1]; |
| 1572 | memcpy (&this->oob_buf[to], fsbuf, num); |
| 1573 | len += num; |
| 1574 | fsbuf += num; |
| 1575 | } |
| 1576 | ofs += mtd->oobavail; |
| 1577 | } |
| 1578 | return this->oob_buf; |
| 1579 | } |
| 1580 | |
| 1581 | #define NOTALIGNED(x) (x & (mtd->oobblock-1)) != 0 |
| 1582 | |
| 1583 | /** |
| 1584 | * nand_write - [MTD Interface] compability function for nand_write_ecc |
| 1585 | * @mtd: MTD device structure |
| 1586 | * @to: offset to write to |
| 1587 | * @len: number of bytes to write |
| 1588 | * @retlen: pointer to variable to store the number of written bytes |
| 1589 | * @buf: the data to write |
| 1590 | * |
| 1591 | * This function simply calls nand_write_ecc with oob buffer and oobsel = NULL |
| 1592 | * |
| 1593 | */ |
| 1594 | static int nand_write (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char * buf) |
| 1595 | { |
| 1596 | return (nand_write_ecc (mtd, to, len, retlen, buf, NULL, NULL)); |
| 1597 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | /** |
| 1600 | * nand_write_ecc - [MTD Interface] NAND write with ECC |
| 1601 | * @mtd: MTD device structure |
| 1602 | * @to: offset to write to |
| 1603 | * @len: number of bytes to write |
| 1604 | * @retlen: pointer to variable to store the number of written bytes |
| 1605 | * @buf: the data to write |
| 1606 | * @eccbuf: filesystem supplied oob data buffer |
| 1607 | * @oobsel: oob selection structure |
| 1608 | * |
| 1609 | * NAND write with ECC |
| 1610 | */ |
| 1611 | static int nand_write_ecc (struct mtd_info *mtd, loff_t to, size_t len, |
| 1612 | size_t * retlen, const u_char * buf, u_char * eccbuf, struct nand_oobinfo *oobsel) |
| 1613 | { |
| 1614 | int startpage, page, ret = -EIO, oob = 0, written = 0, chipnr; |
| 1615 | int autoplace = 0, numpages, totalpages; |
| 1616 | struct nand_chip *this = mtd->priv; |
| 1617 | u_char *oobbuf, *bufstart; |
| 1618 | int ppblock = (1 << (this->phys_erase_shift - this->page_shift)); |
| 1619 | |
| 1620 | DEBUG (MTD_DEBUG_LEVEL3, "nand_write_ecc: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len); |
| 1621 | |
| 1622 | /* Initialize retlen, in case of early exit */ |
| 1623 | *retlen = 0; |
| 1624 | |
| 1625 | /* Do not allow write past end of device */ |
| 1626 | if ((to + len) > mtd->size) { |
| 1627 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: Attempt to write past end of page\n"); |
| 1628 | return -EINVAL; |
| 1629 | } |
| 1630 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1631 | /* reject writes, which are not page aligned */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | if (NOTALIGNED (to) || NOTALIGNED(len)) { |
| 1633 | printk (KERN_NOTICE "nand_write_ecc: Attempt to write not page aligned data\n"); |
| 1634 | return -EINVAL; |
| 1635 | } |
| 1636 | |
| 1637 | /* Grab the lock and see if the device is available */ |
| 1638 | nand_get_device (this, mtd, FL_WRITING); |
| 1639 | |
| 1640 | /* Calculate chipnr */ |
| 1641 | chipnr = (int)(to >> this->chip_shift); |
| 1642 | /* Select the NAND device */ |
| 1643 | this->select_chip(mtd, chipnr); |
| 1644 | |
| 1645 | /* Check, if it is write protected */ |
| 1646 | if (nand_check_wp(mtd)) |
| 1647 | goto out; |
| 1648 | |
| 1649 | /* if oobsel is NULL, use chip defaults */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1650 | if (oobsel == NULL) |
| 1651 | oobsel = &mtd->oobinfo; |
| 1652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | /* Autoplace of oob data ? Use the default placement scheme */ |
| 1654 | if (oobsel->useecc == MTD_NANDECC_AUTOPLACE) { |
| 1655 | oobsel = this->autooob; |
| 1656 | autoplace = 1; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1657 | } |
Thomas Gleixner | 90e260c | 2005-05-19 17:10:26 +0100 | [diff] [blame] | 1658 | if (oobsel->useecc == MTD_NANDECC_AUTOPL_USR) |
| 1659 | autoplace = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | |
| 1661 | /* Setup variables and oob buffer */ |
| 1662 | totalpages = len >> this->page_shift; |
| 1663 | page = (int) (to >> this->page_shift); |
| 1664 | /* Invalidate the page cache, if we write to the cached page */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1665 | if (page <= this->pagebuf && this->pagebuf < (page + totalpages)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | this->pagebuf = -1; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1667 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | /* Set it relative to chip */ |
| 1669 | page &= this->pagemask; |
| 1670 | startpage = page; |
| 1671 | /* Calc number of pages we can write in one go */ |
| 1672 | numpages = min (ppblock - (startpage & (ppblock - 1)), totalpages); |
| 1673 | oobbuf = nand_prepare_oobbuf (mtd, eccbuf, oobsel, autoplace, numpages); |
| 1674 | bufstart = (u_char *)buf; |
| 1675 | |
| 1676 | /* Loop until all data is written */ |
| 1677 | while (written < len) { |
| 1678 | |
| 1679 | this->data_poi = (u_char*) &buf[written]; |
| 1680 | /* Write one page. If this is the last page to write |
| 1681 | * or the last page in this block, then use the |
| 1682 | * real pageprogram command, else select cached programming |
| 1683 | * if supported by the chip. |
| 1684 | */ |
| 1685 | ret = nand_write_page (mtd, this, page, &oobbuf[oob], oobsel, (--numpages > 0)); |
| 1686 | if (ret) { |
| 1687 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: write_page failed %d\n", ret); |
| 1688 | goto out; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1689 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | /* Next oob page */ |
| 1691 | oob += mtd->oobsize; |
| 1692 | /* Update written bytes count */ |
| 1693 | written += mtd->oobblock; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1694 | if (written == len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | goto cmp; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1696 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | /* Increment page address */ |
| 1698 | page++; |
| 1699 | |
| 1700 | /* Have we hit a block boundary ? Then we have to verify and |
| 1701 | * if verify is ok, we have to setup the oob buffer for |
| 1702 | * the next pages. |
| 1703 | */ |
| 1704 | if (!(page & (ppblock - 1))){ |
| 1705 | int ofs; |
| 1706 | this->data_poi = bufstart; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1707 | ret = nand_verify_pages (mtd, this, startpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | page - startpage, |
| 1709 | oobbuf, oobsel, chipnr, (eccbuf != NULL)); |
| 1710 | if (ret) { |
| 1711 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: verify_pages failed %d\n", ret); |
| 1712 | goto out; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1713 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | *retlen = written; |
| 1715 | |
| 1716 | ofs = autoplace ? mtd->oobavail : mtd->oobsize; |
| 1717 | if (eccbuf) |
| 1718 | eccbuf += (page - startpage) * ofs; |
| 1719 | totalpages -= page - startpage; |
| 1720 | numpages = min (totalpages, ppblock); |
| 1721 | page &= this->pagemask; |
| 1722 | startpage = page; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1723 | oobbuf = nand_prepare_oobbuf (mtd, eccbuf, oobsel, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | autoplace, numpages); |
Todd Poynor | 868801e | 2005-11-05 03:21:15 +0000 | [diff] [blame] | 1725 | oob = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | /* Check, if we cross a chip boundary */ |
| 1727 | if (!page) { |
| 1728 | chipnr++; |
| 1729 | this->select_chip(mtd, -1); |
| 1730 | this->select_chip(mtd, chipnr); |
| 1731 | } |
| 1732 | } |
| 1733 | } |
| 1734 | /* Verify the remaining pages */ |
| 1735 | cmp: |
| 1736 | this->data_poi = bufstart; |
| 1737 | ret = nand_verify_pages (mtd, this, startpage, totalpages, |
| 1738 | oobbuf, oobsel, chipnr, (eccbuf != NULL)); |
| 1739 | if (!ret) |
| 1740 | *retlen = written; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1741 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_ecc: verify_pages failed %d\n", ret); |
| 1743 | |
| 1744 | out: |
| 1745 | /* Deselect and wake up anyone waiting on the device */ |
| 1746 | nand_release_device(mtd); |
| 1747 | |
| 1748 | return ret; |
| 1749 | } |
| 1750 | |
| 1751 | |
| 1752 | /** |
| 1753 | * nand_write_oob - [MTD Interface] NAND write out-of-band |
| 1754 | * @mtd: MTD device structure |
| 1755 | * @to: offset to write to |
| 1756 | * @len: number of bytes to write |
| 1757 | * @retlen: pointer to variable to store the number of written bytes |
| 1758 | * @buf: the data to write |
| 1759 | * |
| 1760 | * NAND write out-of-band |
| 1761 | */ |
| 1762 | static int nand_write_oob (struct mtd_info *mtd, loff_t to, size_t len, size_t * retlen, const u_char * buf) |
| 1763 | { |
| 1764 | int column, page, status, ret = -EIO, chipnr; |
| 1765 | struct nand_chip *this = mtd->priv; |
| 1766 | |
| 1767 | DEBUG (MTD_DEBUG_LEVEL3, "nand_write_oob: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len); |
| 1768 | |
| 1769 | /* Shift to get page */ |
| 1770 | page = (int) (to >> this->page_shift); |
| 1771 | chipnr = (int) (to >> this->chip_shift); |
| 1772 | |
| 1773 | /* Mask to get column */ |
| 1774 | column = to & (mtd->oobsize - 1); |
| 1775 | |
| 1776 | /* Initialize return length value */ |
| 1777 | *retlen = 0; |
| 1778 | |
| 1779 | /* Do not allow write past end of page */ |
| 1780 | if ((column + len) > mtd->oobsize) { |
| 1781 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_oob: Attempt to write past end of page\n"); |
| 1782 | return -EINVAL; |
| 1783 | } |
| 1784 | |
| 1785 | /* Grab the lock and see if the device is available */ |
| 1786 | nand_get_device (this, mtd, FL_WRITING); |
| 1787 | |
| 1788 | /* Select the NAND device */ |
| 1789 | this->select_chip(mtd, chipnr); |
| 1790 | |
| 1791 | /* Reset the chip. Some chips (like the Toshiba TC5832DC found |
| 1792 | in one of my DiskOnChip 2000 test units) will clear the whole |
| 1793 | data page too if we don't do this. I have no clue why, but |
| 1794 | I seem to have 'fixed' it in the doc2000 driver in |
| 1795 | August 1999. dwmw2. */ |
| 1796 | this->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); |
| 1797 | |
| 1798 | /* Check, if it is write protected */ |
| 1799 | if (nand_check_wp(mtd)) |
| 1800 | goto out; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1801 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | /* Invalidate the page cache, if we write to the cached page */ |
| 1803 | if (page == this->pagebuf) |
| 1804 | this->pagebuf = -1; |
| 1805 | |
| 1806 | if (NAND_MUST_PAD(this)) { |
| 1807 | /* Write out desired data */ |
| 1808 | this->cmdfunc (mtd, NAND_CMD_SEQIN, mtd->oobblock, page & this->pagemask); |
| 1809 | /* prepad 0xff for partial programming */ |
| 1810 | this->write_buf(mtd, ffchars, column); |
| 1811 | /* write data */ |
| 1812 | this->write_buf(mtd, buf, len); |
| 1813 | /* postpad 0xff for partial programming */ |
| 1814 | this->write_buf(mtd, ffchars, mtd->oobsize - (len+column)); |
| 1815 | } else { |
| 1816 | /* Write out desired data */ |
| 1817 | this->cmdfunc (mtd, NAND_CMD_SEQIN, mtd->oobblock + column, page & this->pagemask); |
| 1818 | /* write data */ |
| 1819 | this->write_buf(mtd, buf, len); |
| 1820 | } |
| 1821 | /* Send command to program the OOB data */ |
| 1822 | this->cmdfunc (mtd, NAND_CMD_PAGEPROG, -1, -1); |
| 1823 | |
| 1824 | status = this->waitfunc (mtd, this, FL_WRITING); |
| 1825 | |
| 1826 | /* See if device thinks it succeeded */ |
David A. Marlin | a4ab4c5 | 2005-01-23 18:30:53 +0000 | [diff] [blame] | 1827 | if (status & NAND_STATUS_FAIL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1828 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_oob: " "Failed write, page 0x%08x\n", page); |
| 1829 | ret = -EIO; |
| 1830 | goto out; |
| 1831 | } |
| 1832 | /* Return happy */ |
| 1833 | *retlen = len; |
| 1834 | |
| 1835 | #ifdef CONFIG_MTD_NAND_VERIFY_WRITE |
| 1836 | /* Send command to read back the data */ |
| 1837 | this->cmdfunc (mtd, NAND_CMD_READOOB, column, page & this->pagemask); |
| 1838 | |
| 1839 | if (this->verify_buf(mtd, buf, len)) { |
| 1840 | DEBUG (MTD_DEBUG_LEVEL0, "nand_write_oob: " "Failed write verify, page 0x%08x\n", page); |
| 1841 | ret = -EIO; |
| 1842 | goto out; |
| 1843 | } |
| 1844 | #endif |
| 1845 | ret = 0; |
| 1846 | out: |
| 1847 | /* Deselect and wake up anyone waiting on the device */ |
| 1848 | nand_release_device(mtd); |
| 1849 | |
| 1850 | return ret; |
| 1851 | } |
| 1852 | |
| 1853 | |
| 1854 | /** |
| 1855 | * nand_writev - [MTD Interface] compabilty function for nand_writev_ecc |
| 1856 | * @mtd: MTD device structure |
| 1857 | * @vecs: the iovectors to write |
| 1858 | * @count: number of vectors |
| 1859 | * @to: offset to write to |
| 1860 | * @retlen: pointer to variable to store the number of written bytes |
| 1861 | * |
| 1862 | * NAND write with kvec. This just calls the ecc function |
| 1863 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1864 | static int nand_writev (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | loff_t to, size_t * retlen) |
| 1866 | { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1867 | return (nand_writev_ecc (mtd, vecs, count, to, retlen, NULL, NULL)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | } |
| 1869 | |
| 1870 | /** |
| 1871 | * nand_writev_ecc - [MTD Interface] write with iovec with ecc |
| 1872 | * @mtd: MTD device structure |
| 1873 | * @vecs: the iovectors to write |
| 1874 | * @count: number of vectors |
| 1875 | * @to: offset to write to |
| 1876 | * @retlen: pointer to variable to store the number of written bytes |
| 1877 | * @eccbuf: filesystem supplied oob data buffer |
| 1878 | * @oobsel: oob selection structure |
| 1879 | * |
| 1880 | * NAND write with iovec with ecc |
| 1881 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1882 | static int nand_writev_ecc (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | loff_t to, size_t * retlen, u_char *eccbuf, struct nand_oobinfo *oobsel) |
| 1884 | { |
| 1885 | int i, page, len, total_len, ret = -EIO, written = 0, chipnr; |
| 1886 | int oob, numpages, autoplace = 0, startpage; |
| 1887 | struct nand_chip *this = mtd->priv; |
| 1888 | int ppblock = (1 << (this->phys_erase_shift - this->page_shift)); |
| 1889 | u_char *oobbuf, *bufstart; |
| 1890 | |
| 1891 | /* Preset written len for early exit */ |
| 1892 | *retlen = 0; |
| 1893 | |
| 1894 | /* Calculate total length of data */ |
| 1895 | total_len = 0; |
| 1896 | for (i = 0; i < count; i++) |
| 1897 | total_len += (int) vecs[i].iov_len; |
| 1898 | |
| 1899 | DEBUG (MTD_DEBUG_LEVEL3, |
| 1900 | "nand_writev: to = 0x%08x, len = %i, count = %ld\n", (unsigned int) to, (unsigned int) total_len, count); |
| 1901 | |
| 1902 | /* Do not allow write past end of page */ |
| 1903 | if ((to + total_len) > mtd->size) { |
| 1904 | DEBUG (MTD_DEBUG_LEVEL0, "nand_writev: Attempted write past end of device\n"); |
| 1905 | return -EINVAL; |
| 1906 | } |
| 1907 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1908 | /* reject writes, which are not page aligned */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | if (NOTALIGNED (to) || NOTALIGNED(total_len)) { |
| 1910 | printk (KERN_NOTICE "nand_write_ecc: Attempt to write not page aligned data\n"); |
| 1911 | return -EINVAL; |
| 1912 | } |
| 1913 | |
| 1914 | /* Grab the lock and see if the device is available */ |
| 1915 | nand_get_device (this, mtd, FL_WRITING); |
| 1916 | |
| 1917 | /* Get the current chip-nr */ |
| 1918 | chipnr = (int) (to >> this->chip_shift); |
| 1919 | /* Select the NAND device */ |
| 1920 | this->select_chip(mtd, chipnr); |
| 1921 | |
| 1922 | /* Check, if it is write protected */ |
| 1923 | if (nand_check_wp(mtd)) |
| 1924 | goto out; |
| 1925 | |
| 1926 | /* if oobsel is NULL, use chip defaults */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1927 | if (oobsel == NULL) |
| 1928 | oobsel = &mtd->oobinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | |
| 1930 | /* Autoplace of oob data ? Use the default placement scheme */ |
| 1931 | if (oobsel->useecc == MTD_NANDECC_AUTOPLACE) { |
| 1932 | oobsel = this->autooob; |
| 1933 | autoplace = 1; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1934 | } |
Thomas Gleixner | 90e260c | 2005-05-19 17:10:26 +0100 | [diff] [blame] | 1935 | if (oobsel->useecc == MTD_NANDECC_AUTOPL_USR) |
| 1936 | autoplace = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | |
| 1938 | /* Setup start page */ |
| 1939 | page = (int) (to >> this->page_shift); |
| 1940 | /* Invalidate the page cache, if we write to the cached page */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1941 | if (page <= this->pagebuf && this->pagebuf < ((to + total_len) >> this->page_shift)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | this->pagebuf = -1; |
| 1943 | |
| 1944 | startpage = page & this->pagemask; |
| 1945 | |
| 1946 | /* Loop until all kvec' data has been written */ |
| 1947 | len = 0; |
| 1948 | while (count) { |
| 1949 | /* If the given tuple is >= pagesize then |
| 1950 | * write it out from the iov |
| 1951 | */ |
| 1952 | if ((vecs->iov_len - len) >= mtd->oobblock) { |
| 1953 | /* Calc number of pages we can write |
| 1954 | * out of this iov in one go */ |
| 1955 | numpages = (vecs->iov_len - len) >> this->page_shift; |
| 1956 | /* Do not cross block boundaries */ |
| 1957 | numpages = min (ppblock - (startpage & (ppblock - 1)), numpages); |
| 1958 | oobbuf = nand_prepare_oobbuf (mtd, NULL, oobsel, autoplace, numpages); |
| 1959 | bufstart = (u_char *)vecs->iov_base; |
| 1960 | bufstart += len; |
| 1961 | this->data_poi = bufstart; |
| 1962 | oob = 0; |
| 1963 | for (i = 1; i <= numpages; i++) { |
| 1964 | /* Write one page. If this is the last page to write |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1965 | * then use the real pageprogram command, else select |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | * cached programming if supported by the chip. |
| 1967 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1968 | ret = nand_write_page (mtd, this, page & this->pagemask, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | &oobbuf[oob], oobsel, i != numpages); |
| 1970 | if (ret) |
| 1971 | goto out; |
| 1972 | this->data_poi += mtd->oobblock; |
| 1973 | len += mtd->oobblock; |
| 1974 | oob += mtd->oobsize; |
| 1975 | page++; |
| 1976 | } |
| 1977 | /* Check, if we have to switch to the next tuple */ |
| 1978 | if (len >= (int) vecs->iov_len) { |
| 1979 | vecs++; |
| 1980 | len = 0; |
| 1981 | count--; |
| 1982 | } |
| 1983 | } else { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1984 | /* We must use the internal buffer, read data out of each |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | * tuple until we have a full page to write |
| 1986 | */ |
| 1987 | int cnt = 0; |
| 1988 | while (cnt < mtd->oobblock) { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1989 | if (vecs->iov_base != NULL && vecs->iov_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | this->data_buf[cnt++] = ((u_char *) vecs->iov_base)[len++]; |
| 1991 | /* Check, if we have to switch to the next tuple */ |
| 1992 | if (len >= (int) vecs->iov_len) { |
| 1993 | vecs++; |
| 1994 | len = 0; |
| 1995 | count--; |
| 1996 | } |
| 1997 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 1998 | this->pagebuf = page; |
| 1999 | this->data_poi = this->data_buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | bufstart = this->data_poi; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2001 | numpages = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | oobbuf = nand_prepare_oobbuf (mtd, NULL, oobsel, autoplace, numpages); |
| 2003 | ret = nand_write_page (mtd, this, page & this->pagemask, |
| 2004 | oobbuf, oobsel, 0); |
| 2005 | if (ret) |
| 2006 | goto out; |
| 2007 | page++; |
| 2008 | } |
| 2009 | |
| 2010 | this->data_poi = bufstart; |
| 2011 | ret = nand_verify_pages (mtd, this, startpage, numpages, oobbuf, oobsel, chipnr, 0); |
| 2012 | if (ret) |
| 2013 | goto out; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2014 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | written += mtd->oobblock * numpages; |
| 2016 | /* All done ? */ |
| 2017 | if (!count) |
| 2018 | break; |
| 2019 | |
| 2020 | startpage = page & this->pagemask; |
| 2021 | /* Check, if we cross a chip boundary */ |
| 2022 | if (!startpage) { |
| 2023 | chipnr++; |
| 2024 | this->select_chip(mtd, -1); |
| 2025 | this->select_chip(mtd, chipnr); |
| 2026 | } |
| 2027 | } |
| 2028 | ret = 0; |
| 2029 | out: |
| 2030 | /* Deselect and wake up anyone waiting on the device */ |
| 2031 | nand_release_device(mtd); |
| 2032 | |
| 2033 | *retlen = written; |
| 2034 | return ret; |
| 2035 | } |
| 2036 | |
| 2037 | /** |
| 2038 | * single_erease_cmd - [GENERIC] NAND standard block erase command function |
| 2039 | * @mtd: MTD device structure |
| 2040 | * @page: the page address of the block which will be erased |
| 2041 | * |
| 2042 | * Standard erase command for NAND chips |
| 2043 | */ |
| 2044 | static void single_erase_cmd (struct mtd_info *mtd, int page) |
| 2045 | { |
| 2046 | struct nand_chip *this = mtd->priv; |
| 2047 | /* Send commands to erase a block */ |
| 2048 | this->cmdfunc (mtd, NAND_CMD_ERASE1, -1, page); |
| 2049 | this->cmdfunc (mtd, NAND_CMD_ERASE2, -1, -1); |
| 2050 | } |
| 2051 | |
| 2052 | /** |
| 2053 | * multi_erease_cmd - [GENERIC] AND specific block erase command function |
| 2054 | * @mtd: MTD device structure |
| 2055 | * @page: the page address of the block which will be erased |
| 2056 | * |
| 2057 | * AND multi block erase command function |
| 2058 | * Erase 4 consecutive blocks |
| 2059 | */ |
| 2060 | static void multi_erase_cmd (struct mtd_info *mtd, int page) |
| 2061 | { |
| 2062 | struct nand_chip *this = mtd->priv; |
| 2063 | /* Send commands to erase a block */ |
| 2064 | this->cmdfunc (mtd, NAND_CMD_ERASE1, -1, page++); |
| 2065 | this->cmdfunc (mtd, NAND_CMD_ERASE1, -1, page++); |
| 2066 | this->cmdfunc (mtd, NAND_CMD_ERASE1, -1, page++); |
| 2067 | this->cmdfunc (mtd, NAND_CMD_ERASE1, -1, page); |
| 2068 | this->cmdfunc (mtd, NAND_CMD_ERASE2, -1, -1); |
| 2069 | } |
| 2070 | |
| 2071 | /** |
| 2072 | * nand_erase - [MTD Interface] erase block(s) |
| 2073 | * @mtd: MTD device structure |
| 2074 | * @instr: erase instruction |
| 2075 | * |
| 2076 | * Erase one ore more blocks |
| 2077 | */ |
| 2078 | static int nand_erase (struct mtd_info *mtd, struct erase_info *instr) |
| 2079 | { |
| 2080 | return nand_erase_nand (mtd, instr, 0); |
| 2081 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2082 | |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 2083 | #define BBT_PAGE_MASK 0xffffff3f |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | /** |
| 2085 | * nand_erase_intern - [NAND Interface] erase block(s) |
| 2086 | * @mtd: MTD device structure |
| 2087 | * @instr: erase instruction |
| 2088 | * @allowbbt: allow erasing the bbt area |
| 2089 | * |
| 2090 | * Erase one ore more blocks |
| 2091 | */ |
| 2092 | int nand_erase_nand (struct mtd_info *mtd, struct erase_info *instr, int allowbbt) |
| 2093 | { |
| 2094 | int page, len, status, pages_per_block, ret, chipnr; |
| 2095 | struct nand_chip *this = mtd->priv; |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 2096 | int rewrite_bbt[NAND_MAX_CHIPS]={0}; /* flags to indicate the page, if bbt needs to be rewritten. */ |
| 2097 | unsigned int bbt_masked_page; /* bbt mask to compare to page being erased. */ |
| 2098 | /* It is used to see if the current page is in the same */ |
| 2099 | /* 256 block group and the same bank as the bbt. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | |
| 2101 | DEBUG (MTD_DEBUG_LEVEL3, |
| 2102 | "nand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len); |
| 2103 | |
| 2104 | /* Start address must align on block boundary */ |
| 2105 | if (instr->addr & ((1 << this->phys_erase_shift) - 1)) { |
| 2106 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase: Unaligned address\n"); |
| 2107 | return -EINVAL; |
| 2108 | } |
| 2109 | |
| 2110 | /* Length must align on block boundary */ |
| 2111 | if (instr->len & ((1 << this->phys_erase_shift) - 1)) { |
| 2112 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase: Length not block aligned\n"); |
| 2113 | return -EINVAL; |
| 2114 | } |
| 2115 | |
| 2116 | /* Do not allow erase past end of device */ |
| 2117 | if ((instr->len + instr->addr) > mtd->size) { |
| 2118 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase: Erase past end of device\n"); |
| 2119 | return -EINVAL; |
| 2120 | } |
| 2121 | |
| 2122 | instr->fail_addr = 0xffffffff; |
| 2123 | |
| 2124 | /* Grab the lock and see if the device is available */ |
| 2125 | nand_get_device (this, mtd, FL_ERASING); |
| 2126 | |
| 2127 | /* Shift to get first page */ |
| 2128 | page = (int) (instr->addr >> this->page_shift); |
| 2129 | chipnr = (int) (instr->addr >> this->chip_shift); |
| 2130 | |
| 2131 | /* Calculate pages in each block */ |
| 2132 | pages_per_block = 1 << (this->phys_erase_shift - this->page_shift); |
| 2133 | |
| 2134 | /* Select the NAND device */ |
| 2135 | this->select_chip(mtd, chipnr); |
| 2136 | |
| 2137 | /* Check the WP bit */ |
| 2138 | /* Check, if it is write protected */ |
| 2139 | if (nand_check_wp(mtd)) { |
| 2140 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase: Device is write protected!!!\n"); |
| 2141 | instr->state = MTD_ERASE_FAILED; |
| 2142 | goto erase_exit; |
| 2143 | } |
| 2144 | |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 2145 | /* if BBT requires refresh, set the BBT page mask to see if the BBT should be rewritten */ |
| 2146 | if (this->options & BBT_AUTO_REFRESH) { |
| 2147 | bbt_masked_page = this->bbt_td->pages[chipnr] & BBT_PAGE_MASK; |
| 2148 | } else { |
| 2149 | bbt_masked_page = 0xffffffff; /* should not match anything */ |
| 2150 | } |
| 2151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | /* Loop through the pages */ |
| 2153 | len = instr->len; |
| 2154 | |
| 2155 | instr->state = MTD_ERASING; |
| 2156 | |
| 2157 | while (len) { |
| 2158 | /* Check if we have a bad block, we do not erase bad blocks ! */ |
| 2159 | if (nand_block_checkbad(mtd, ((loff_t) page) << this->page_shift, 0, allowbbt)) { |
| 2160 | printk (KERN_WARNING "nand_erase: attempt to erase a bad block at page 0x%08x\n", page); |
| 2161 | instr->state = MTD_ERASE_FAILED; |
| 2162 | goto erase_exit; |
| 2163 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2164 | |
| 2165 | /* Invalidate the page cache, if we erase the block which contains |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | the current cached page */ |
| 2167 | if (page <= this->pagebuf && this->pagebuf < (page + pages_per_block)) |
| 2168 | this->pagebuf = -1; |
| 2169 | |
| 2170 | this->erase_cmd (mtd, page & this->pagemask); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | status = this->waitfunc (mtd, this, FL_ERASING); |
| 2173 | |
David A. Marlin | 068e3c0 | 2005-01-24 03:07:46 +0000 | [diff] [blame] | 2174 | /* See if operation failed and additional status checks are available */ |
| 2175 | if ((status & NAND_STATUS_FAIL) && (this->errstat)) { |
| 2176 | status = this->errstat(mtd, this, FL_ERASING, status, page); |
| 2177 | } |
| 2178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | /* See if block erase succeeded */ |
David A. Marlin | a4ab4c5 | 2005-01-23 18:30:53 +0000 | [diff] [blame] | 2180 | if (status & NAND_STATUS_FAIL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase: " "Failed erase, page 0x%08x\n", page); |
| 2182 | instr->state = MTD_ERASE_FAILED; |
| 2183 | instr->fail_addr = (page << this->page_shift); |
| 2184 | goto erase_exit; |
| 2185 | } |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 2186 | |
| 2187 | /* if BBT requires refresh, set the BBT rewrite flag to the page being erased */ |
| 2188 | if (this->options & BBT_AUTO_REFRESH) { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2189 | if (((page & BBT_PAGE_MASK) == bbt_masked_page) && |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 2190 | (page != this->bbt_td->pages[chipnr])) { |
| 2191 | rewrite_bbt[chipnr] = (page << this->page_shift); |
| 2192 | } |
| 2193 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | /* Increment page address and decrement length */ |
| 2196 | len -= (1 << this->phys_erase_shift); |
| 2197 | page += pages_per_block; |
| 2198 | |
| 2199 | /* Check, if we cross a chip boundary */ |
| 2200 | if (len && !(page & this->pagemask)) { |
| 2201 | chipnr++; |
| 2202 | this->select_chip(mtd, -1); |
| 2203 | this->select_chip(mtd, chipnr); |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 2204 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2205 | /* if BBT requires refresh and BBT-PERCHIP, |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 2206 | * set the BBT page mask to see if this BBT should be rewritten */ |
| 2207 | if ((this->options & BBT_AUTO_REFRESH) && (this->bbt_td->options & NAND_BBT_PERCHIP)) { |
| 2208 | bbt_masked_page = this->bbt_td->pages[chipnr] & BBT_PAGE_MASK; |
| 2209 | } |
| 2210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | } |
| 2212 | } |
| 2213 | instr->state = MTD_ERASE_DONE; |
| 2214 | |
| 2215 | erase_exit: |
| 2216 | |
| 2217 | ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO; |
| 2218 | /* Do call back function */ |
| 2219 | if (!ret) |
| 2220 | mtd_erase_callback(instr); |
| 2221 | |
| 2222 | /* Deselect and wake up anyone waiting on the device */ |
| 2223 | nand_release_device(mtd); |
| 2224 | |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 2225 | /* if BBT requires refresh and erase was successful, rewrite any selected bad block tables */ |
| 2226 | if ((this->options & BBT_AUTO_REFRESH) && (!ret)) { |
| 2227 | for (chipnr = 0; chipnr < this->numchips; chipnr++) { |
| 2228 | if (rewrite_bbt[chipnr]) { |
| 2229 | /* update the BBT for chip */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2230 | DEBUG (MTD_DEBUG_LEVEL0, "nand_erase_nand: nand_update_bbt (%d:0x%0x 0x%0x)\n", |
David A. Marlin | 30f464b | 2005-01-17 18:35:25 +0000 | [diff] [blame] | 2231 | chipnr, rewrite_bbt[chipnr], this->bbt_td->pages[chipnr]); |
| 2232 | nand_update_bbt (mtd, rewrite_bbt[chipnr]); |
| 2233 | } |
| 2234 | } |
| 2235 | } |
| 2236 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | /* Return more or less happy */ |
| 2238 | return ret; |
| 2239 | } |
| 2240 | |
| 2241 | /** |
| 2242 | * nand_sync - [MTD Interface] sync |
| 2243 | * @mtd: MTD device structure |
| 2244 | * |
| 2245 | * Sync is actually a wait for chip ready function |
| 2246 | */ |
| 2247 | static void nand_sync (struct mtd_info *mtd) |
| 2248 | { |
| 2249 | struct nand_chip *this = mtd->priv; |
| 2250 | |
| 2251 | DEBUG (MTD_DEBUG_LEVEL3, "nand_sync: called\n"); |
| 2252 | |
| 2253 | /* Grab the lock and see if the device is available */ |
| 2254 | nand_get_device (this, mtd, FL_SYNCING); |
| 2255 | /* Release it and go back */ |
| 2256 | nand_release_device (mtd); |
| 2257 | } |
| 2258 | |
| 2259 | |
| 2260 | /** |
| 2261 | * nand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad |
| 2262 | * @mtd: MTD device structure |
| 2263 | * @ofs: offset relative to mtd start |
| 2264 | */ |
| 2265 | static int nand_block_isbad (struct mtd_info *mtd, loff_t ofs) |
| 2266 | { |
| 2267 | /* Check for invalid offset */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2268 | if (ofs > mtd->size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | return -EINVAL; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | return nand_block_checkbad (mtd, ofs, 1, 0); |
| 2272 | } |
| 2273 | |
| 2274 | /** |
| 2275 | * nand_block_markbad - [MTD Interface] Mark the block at the given offset as bad |
| 2276 | * @mtd: MTD device structure |
| 2277 | * @ofs: offset relative to mtd start |
| 2278 | */ |
| 2279 | static int nand_block_markbad (struct mtd_info *mtd, loff_t ofs) |
| 2280 | { |
| 2281 | struct nand_chip *this = mtd->priv; |
| 2282 | int ret; |
| 2283 | |
| 2284 | if ((ret = nand_block_isbad(mtd, ofs))) { |
| 2285 | /* If it was bad already, return success and do nothing. */ |
| 2286 | if (ret > 0) |
| 2287 | return 0; |
| 2288 | return ret; |
| 2289 | } |
| 2290 | |
| 2291 | return this->block_markbad(mtd, ofs); |
| 2292 | } |
| 2293 | |
| 2294 | /** |
Vitaly Wool | 962034f | 2005-09-15 14:58:53 +0100 | [diff] [blame] | 2295 | * nand_suspend - [MTD Interface] Suspend the NAND flash |
| 2296 | * @mtd: MTD device structure |
| 2297 | */ |
| 2298 | static int nand_suspend(struct mtd_info *mtd) |
| 2299 | { |
| 2300 | struct nand_chip *this = mtd->priv; |
| 2301 | |
| 2302 | return nand_get_device (this, mtd, FL_PM_SUSPENDED); |
| 2303 | } |
| 2304 | |
| 2305 | /** |
| 2306 | * nand_resume - [MTD Interface] Resume the NAND flash |
| 2307 | * @mtd: MTD device structure |
| 2308 | */ |
| 2309 | static void nand_resume(struct mtd_info *mtd) |
| 2310 | { |
| 2311 | struct nand_chip *this = mtd->priv; |
| 2312 | |
| 2313 | if (this->state == FL_PM_SUSPENDED) |
| 2314 | nand_release_device(mtd); |
| 2315 | else |
| 2316 | printk(KERN_ERR "resume() called for the chip which is not " |
| 2317 | "in suspended state\n"); |
| 2318 | |
| 2319 | } |
| 2320 | |
| 2321 | |
| 2322 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | * nand_scan - [NAND Interface] Scan for the NAND device |
| 2324 | * @mtd: MTD device structure |
| 2325 | * @maxchips: Number of chips to scan for |
| 2326 | * |
| 2327 | * This fills out all the not initialized function pointers |
| 2328 | * with the defaults. |
| 2329 | * The flash ID is read and the mtd/chip structures are |
| 2330 | * filled with the appropriate values. Buffers are allocated if |
| 2331 | * they are not provided by the board driver |
| 2332 | * |
| 2333 | */ |
| 2334 | int nand_scan (struct mtd_info *mtd, int maxchips) |
| 2335 | { |
Ben Dooks | 3b946e3 | 2005-03-14 18:30:48 +0000 | [diff] [blame] | 2336 | int i, nand_maf_id, nand_dev_id, busw, maf_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | struct nand_chip *this = mtd->priv; |
| 2338 | |
| 2339 | /* Get buswidth to select the correct functions*/ |
| 2340 | busw = this->options & NAND_BUSWIDTH_16; |
| 2341 | |
| 2342 | /* check for proper chip_delay setup, set 20us if not */ |
| 2343 | if (!this->chip_delay) |
| 2344 | this->chip_delay = 20; |
| 2345 | |
| 2346 | /* check, if a user supplied command function given */ |
| 2347 | if (this->cmdfunc == NULL) |
| 2348 | this->cmdfunc = nand_command; |
| 2349 | |
| 2350 | /* check, if a user supplied wait function given */ |
| 2351 | if (this->waitfunc == NULL) |
| 2352 | this->waitfunc = nand_wait; |
| 2353 | |
| 2354 | if (!this->select_chip) |
| 2355 | this->select_chip = nand_select_chip; |
| 2356 | if (!this->write_byte) |
| 2357 | this->write_byte = busw ? nand_write_byte16 : nand_write_byte; |
| 2358 | if (!this->read_byte) |
| 2359 | this->read_byte = busw ? nand_read_byte16 : nand_read_byte; |
| 2360 | if (!this->write_word) |
| 2361 | this->write_word = nand_write_word; |
| 2362 | if (!this->read_word) |
| 2363 | this->read_word = nand_read_word; |
| 2364 | if (!this->block_bad) |
| 2365 | this->block_bad = nand_block_bad; |
| 2366 | if (!this->block_markbad) |
| 2367 | this->block_markbad = nand_default_block_markbad; |
| 2368 | if (!this->write_buf) |
| 2369 | this->write_buf = busw ? nand_write_buf16 : nand_write_buf; |
| 2370 | if (!this->read_buf) |
| 2371 | this->read_buf = busw ? nand_read_buf16 : nand_read_buf; |
| 2372 | if (!this->verify_buf) |
| 2373 | this->verify_buf = busw ? nand_verify_buf16 : nand_verify_buf; |
| 2374 | if (!this->scan_bbt) |
| 2375 | this->scan_bbt = nand_default_bbt; |
| 2376 | |
| 2377 | /* Select the device */ |
| 2378 | this->select_chip(mtd, 0); |
| 2379 | |
| 2380 | /* Send the command for reading device ID */ |
| 2381 | this->cmdfunc (mtd, NAND_CMD_READID, 0x00, -1); |
| 2382 | |
| 2383 | /* Read manufacturer and device IDs */ |
| 2384 | nand_maf_id = this->read_byte(mtd); |
| 2385 | nand_dev_id = this->read_byte(mtd); |
| 2386 | |
| 2387 | /* Print and store flash device information */ |
| 2388 | for (i = 0; nand_flash_ids[i].name != NULL; i++) { |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2389 | |
| 2390 | if (nand_dev_id != nand_flash_ids[i].id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | continue; |
| 2392 | |
| 2393 | if (!mtd->name) mtd->name = nand_flash_ids[i].name; |
| 2394 | this->chipsize = nand_flash_ids[i].chipsize << 20; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2396 | /* New devices have all the information in additional id bytes */ |
| 2397 | if (!nand_flash_ids[i].pagesize) { |
| 2398 | int extid; |
| 2399 | /* The 3rd id byte contains non relevant data ATM */ |
| 2400 | extid = this->read_byte(mtd); |
| 2401 | /* The 4th id byte is the important one */ |
| 2402 | extid = this->read_byte(mtd); |
| 2403 | /* Calc pagesize */ |
| 2404 | mtd->oobblock = 1024 << (extid & 0x3); |
| 2405 | extid >>= 2; |
| 2406 | /* Calc oobsize */ |
Thomas Gleixner | d409466 | 2005-08-11 18:13:46 +0100 | [diff] [blame] | 2407 | mtd->oobsize = (8 << (extid & 0x01)) * (mtd->oobblock >> 9); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2408 | extid >>= 2; |
| 2409 | /* Calc blocksize. Blocksize is multiples of 64KiB */ |
| 2410 | mtd->erasesize = (64 * 1024) << (extid & 0x03); |
| 2411 | extid >>= 2; |
| 2412 | /* Get buswidth information */ |
| 2413 | busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2414 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | } else { |
| 2416 | /* Old devices have this data hardcoded in the |
| 2417 | * device id table */ |
| 2418 | mtd->erasesize = nand_flash_ids[i].erasesize; |
| 2419 | mtd->oobblock = nand_flash_ids[i].pagesize; |
| 2420 | mtd->oobsize = mtd->oobblock / 32; |
| 2421 | busw = nand_flash_ids[i].options & NAND_BUSWIDTH_16; |
| 2422 | } |
| 2423 | |
Kyungmin Park | 0ea4a75 | 2005-02-16 09:39:39 +0000 | [diff] [blame] | 2424 | /* Try to identify manufacturer */ |
| 2425 | for (maf_id = 0; nand_manuf_ids[maf_id].id != 0x0; maf_id++) { |
| 2426 | if (nand_manuf_ids[maf_id].id == nand_maf_id) |
| 2427 | break; |
| 2428 | } |
| 2429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | /* Check, if buswidth is correct. Hardware drivers should set |
| 2431 | * this correct ! */ |
| 2432 | if (busw != (this->options & NAND_BUSWIDTH_16)) { |
| 2433 | printk (KERN_INFO "NAND device: Manufacturer ID:" |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2434 | " 0x%02x, Chip ID: 0x%02x (%s %s)\n", nand_maf_id, nand_dev_id, |
Kyungmin Park | 0ea4a75 | 2005-02-16 09:39:39 +0000 | [diff] [blame] | 2435 | nand_manuf_ids[maf_id].name , mtd->name); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2436 | printk (KERN_WARNING |
| 2437 | "NAND bus width %d instead %d bit\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2438 | (this->options & NAND_BUSWIDTH_16) ? 16 : 8, |
| 2439 | busw ? 16 : 8); |
| 2440 | this->select_chip(mtd, -1); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2441 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2443 | |
| 2444 | /* Calculate the address shift from the page size */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | this->page_shift = ffs(mtd->oobblock) - 1; |
| 2446 | this->bbt_erase_shift = this->phys_erase_shift = ffs(mtd->erasesize) - 1; |
| 2447 | this->chip_shift = ffs(this->chipsize) - 1; |
| 2448 | |
| 2449 | /* Set the bad block position */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2450 | this->badblockpos = mtd->oobblock > 512 ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | NAND_LARGE_BADBLOCK_POS : NAND_SMALL_BADBLOCK_POS; |
| 2452 | |
| 2453 | /* Get chip options, preserve non chip based options */ |
| 2454 | this->options &= ~NAND_CHIPOPTIONS_MSK; |
| 2455 | this->options |= nand_flash_ids[i].options & NAND_CHIPOPTIONS_MSK; |
| 2456 | /* Set this as a default. Board drivers can override it, if neccecary */ |
| 2457 | this->options |= NAND_NO_AUTOINCR; |
| 2458 | /* Check if this is a not a samsung device. Do not clear the options |
| 2459 | * for chips which are not having an extended id. |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2460 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | if (nand_maf_id != NAND_MFR_SAMSUNG && !nand_flash_ids[i].pagesize) |
| 2462 | this->options &= ~NAND_SAMSUNG_LP_OPTIONS; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2463 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | /* Check for AND chips with 4 page planes */ |
| 2465 | if (this->options & NAND_4PAGE_ARRAY) |
| 2466 | this->erase_cmd = multi_erase_cmd; |
| 2467 | else |
| 2468 | this->erase_cmd = single_erase_cmd; |
| 2469 | |
| 2470 | /* Do not replace user supplied command function ! */ |
| 2471 | if (mtd->oobblock > 512 && this->cmdfunc == nand_command) |
| 2472 | this->cmdfunc = nand_command_lp; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2473 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2474 | printk (KERN_INFO "NAND device: Manufacturer ID:" |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2475 | " 0x%02x, Chip ID: 0x%02x (%s %s)\n", nand_maf_id, nand_dev_id, |
Kyungmin Park | 0ea4a75 | 2005-02-16 09:39:39 +0000 | [diff] [blame] | 2476 | nand_manuf_ids[maf_id].name , nand_flash_ids[i].name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | break; |
| 2478 | } |
| 2479 | |
| 2480 | if (!nand_flash_ids[i].name) { |
| 2481 | printk (KERN_WARNING "No NAND device found!!!\n"); |
| 2482 | this->select_chip(mtd, -1); |
| 2483 | return 1; |
| 2484 | } |
| 2485 | |
| 2486 | for (i=1; i < maxchips; i++) { |
| 2487 | this->select_chip(mtd, i); |
| 2488 | |
| 2489 | /* Send the command for reading device ID */ |
| 2490 | this->cmdfunc (mtd, NAND_CMD_READID, 0x00, -1); |
| 2491 | |
| 2492 | /* Read manufacturer and device IDs */ |
| 2493 | if (nand_maf_id != this->read_byte(mtd) || |
| 2494 | nand_dev_id != this->read_byte(mtd)) |
| 2495 | break; |
| 2496 | } |
| 2497 | if (i > 1) |
| 2498 | printk(KERN_INFO "%d NAND chips detected\n", i); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2500 | /* Allocate buffers, if neccecary */ |
| 2501 | if (!this->oob_buf) { |
| 2502 | size_t len; |
| 2503 | len = mtd->oobsize << (this->phys_erase_shift - this->page_shift); |
| 2504 | this->oob_buf = kmalloc (len, GFP_KERNEL); |
| 2505 | if (!this->oob_buf) { |
| 2506 | printk (KERN_ERR "nand_scan(): Cannot allocate oob_buf\n"); |
| 2507 | return -ENOMEM; |
| 2508 | } |
| 2509 | this->options |= NAND_OOBBUF_ALLOC; |
| 2510 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2512 | if (!this->data_buf) { |
| 2513 | size_t len; |
| 2514 | len = mtd->oobblock + mtd->oobsize; |
| 2515 | this->data_buf = kmalloc (len, GFP_KERNEL); |
| 2516 | if (!this->data_buf) { |
| 2517 | if (this->options & NAND_OOBBUF_ALLOC) |
| 2518 | kfree (this->oob_buf); |
| 2519 | printk (KERN_ERR "nand_scan(): Cannot allocate data_buf\n"); |
| 2520 | return -ENOMEM; |
| 2521 | } |
| 2522 | this->options |= NAND_DATABUF_ALLOC; |
| 2523 | } |
| 2524 | |
| 2525 | /* Store the number of chips and calc total size for mtd */ |
| 2526 | this->numchips = i; |
| 2527 | mtd->size = i * this->chipsize; |
| 2528 | /* Convert chipsize to number of pages per chip -1. */ |
| 2529 | this->pagemask = (this->chipsize >> this->page_shift) - 1; |
| 2530 | /* Preset the internal oob buffer */ |
| 2531 | memset(this->oob_buf, 0xff, mtd->oobsize << (this->phys_erase_shift - this->page_shift)); |
| 2532 | |
| 2533 | /* If no default placement scheme is given, select an |
| 2534 | * appropriate one */ |
| 2535 | if (!this->autooob) { |
| 2536 | /* Select the appropriate default oob placement scheme for |
| 2537 | * placement agnostic filesystems */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2538 | switch (mtd->oobsize) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2539 | case 8: |
| 2540 | this->autooob = &nand_oob_8; |
| 2541 | break; |
| 2542 | case 16: |
| 2543 | this->autooob = &nand_oob_16; |
| 2544 | break; |
| 2545 | case 64: |
| 2546 | this->autooob = &nand_oob_64; |
| 2547 | break; |
| 2548 | default: |
| 2549 | printk (KERN_WARNING "No oob scheme defined for oobsize %d\n", |
| 2550 | mtd->oobsize); |
| 2551 | BUG(); |
| 2552 | } |
| 2553 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2555 | /* The number of bytes available for the filesystem to place fs dependend |
| 2556 | * oob data */ |
Thomas Gleixner | 998cf64 | 2005-04-01 08:21:48 +0100 | [diff] [blame] | 2557 | mtd->oobavail = 0; |
| 2558 | for (i = 0; this->autooob->oobfree[i][1]; i++) |
| 2559 | mtd->oobavail += this->autooob->oobfree[i][1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2560 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2561 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2562 | * check ECC mode, default to software |
| 2563 | * if 3byte/512byte hardware ECC is selected and we have 256 byte pagesize |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2564 | * fallback to software ECC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2565 | */ |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2566 | this->eccsize = 256; /* set default eccsize */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2567 | this->eccbytes = 3; |
| 2568 | |
| 2569 | switch (this->eccmode) { |
| 2570 | case NAND_ECC_HW12_2048: |
| 2571 | if (mtd->oobblock < 2048) { |
| 2572 | printk(KERN_WARNING "2048 byte HW ECC not possible on %d byte page size, fallback to SW ECC\n", |
| 2573 | mtd->oobblock); |
| 2574 | this->eccmode = NAND_ECC_SOFT; |
| 2575 | this->calculate_ecc = nand_calculate_ecc; |
| 2576 | this->correct_data = nand_correct_data; |
| 2577 | } else |
| 2578 | this->eccsize = 2048; |
| 2579 | break; |
| 2580 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2581 | case NAND_ECC_HW3_512: |
| 2582 | case NAND_ECC_HW6_512: |
| 2583 | case NAND_ECC_HW8_512: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2584 | if (mtd->oobblock == 256) { |
| 2585 | printk (KERN_WARNING "512 byte HW ECC not possible on 256 Byte pagesize, fallback to SW ECC \n"); |
| 2586 | this->eccmode = NAND_ECC_SOFT; |
| 2587 | this->calculate_ecc = nand_calculate_ecc; |
| 2588 | this->correct_data = nand_correct_data; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2589 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2590 | this->eccsize = 512; /* set eccsize to 512 */ |
| 2591 | break; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2593 | case NAND_ECC_HW3_256: |
| 2594 | break; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2595 | |
| 2596 | case NAND_ECC_NONE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2597 | printk (KERN_WARNING "NAND_ECC_NONE selected by board driver. This is not recommended !!\n"); |
| 2598 | this->eccmode = NAND_ECC_NONE; |
| 2599 | break; |
| 2600 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2601 | case NAND_ECC_SOFT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2602 | this->calculate_ecc = nand_calculate_ecc; |
| 2603 | this->correct_data = nand_correct_data; |
| 2604 | break; |
| 2605 | |
| 2606 | default: |
| 2607 | printk (KERN_WARNING "Invalid NAND_ECC_MODE %d\n", this->eccmode); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2608 | BUG(); |
| 2609 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2610 | |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2611 | /* Check hardware ecc function availability and adjust number of ecc bytes per |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2612 | * calculation step |
| 2613 | */ |
| 2614 | switch (this->eccmode) { |
| 2615 | case NAND_ECC_HW12_2048: |
| 2616 | this->eccbytes += 4; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2617 | case NAND_ECC_HW8_512: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2618 | this->eccbytes += 2; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2619 | case NAND_ECC_HW6_512: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2620 | this->eccbytes += 3; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2621 | case NAND_ECC_HW3_512: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2622 | case NAND_ECC_HW3_256: |
| 2623 | if (this->calculate_ecc && this->correct_data && this->enable_hwecc) |
| 2624 | break; |
| 2625 | printk (KERN_WARNING "No ECC functions supplied, Hardware ECC not possible\n"); |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2626 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2627 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2629 | mtd->eccsize = this->eccsize; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2630 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2631 | /* Set the number of read / write steps for one page to ensure ECC generation */ |
| 2632 | switch (this->eccmode) { |
| 2633 | case NAND_ECC_HW12_2048: |
| 2634 | this->eccsteps = mtd->oobblock / 2048; |
| 2635 | break; |
| 2636 | case NAND_ECC_HW3_512: |
| 2637 | case NAND_ECC_HW6_512: |
| 2638 | case NAND_ECC_HW8_512: |
| 2639 | this->eccsteps = mtd->oobblock / 512; |
| 2640 | break; |
| 2641 | case NAND_ECC_HW3_256: |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2642 | case NAND_ECC_SOFT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | this->eccsteps = mtd->oobblock / 256; |
| 2644 | break; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2645 | |
| 2646 | case NAND_ECC_NONE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2647 | this->eccsteps = 1; |
| 2648 | break; |
| 2649 | } |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2651 | /* Initialize state, waitqueue and spinlock */ |
| 2652 | this->state = FL_READY; |
| 2653 | init_waitqueue_head (&this->wq); |
| 2654 | spin_lock_init (&this->chip_lock); |
| 2655 | |
| 2656 | /* De-select the device */ |
| 2657 | this->select_chip(mtd, -1); |
| 2658 | |
| 2659 | /* Invalidate the pagebuffer reference */ |
| 2660 | this->pagebuf = -1; |
| 2661 | |
| 2662 | /* Fill in remaining MTD driver data */ |
| 2663 | mtd->type = MTD_NANDFLASH; |
| 2664 | mtd->flags = MTD_CAP_NANDFLASH | MTD_ECC; |
| 2665 | mtd->ecctype = MTD_ECC_SW; |
| 2666 | mtd->erase = nand_erase; |
| 2667 | mtd->point = NULL; |
| 2668 | mtd->unpoint = NULL; |
| 2669 | mtd->read = nand_read; |
| 2670 | mtd->write = nand_write; |
| 2671 | mtd->read_ecc = nand_read_ecc; |
| 2672 | mtd->write_ecc = nand_write_ecc; |
| 2673 | mtd->read_oob = nand_read_oob; |
| 2674 | mtd->write_oob = nand_write_oob; |
| 2675 | mtd->readv = NULL; |
| 2676 | mtd->writev = nand_writev; |
| 2677 | mtd->writev_ecc = nand_writev_ecc; |
| 2678 | mtd->sync = nand_sync; |
| 2679 | mtd->lock = NULL; |
| 2680 | mtd->unlock = NULL; |
Vitaly Wool | 962034f | 2005-09-15 14:58:53 +0100 | [diff] [blame] | 2681 | mtd->suspend = nand_suspend; |
| 2682 | mtd->resume = nand_resume; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2683 | mtd->block_isbad = nand_block_isbad; |
| 2684 | mtd->block_markbad = nand_block_markbad; |
| 2685 | |
| 2686 | /* and make the autooob the default one */ |
| 2687 | memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo)); |
| 2688 | |
| 2689 | mtd->owner = THIS_MODULE; |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2690 | |
Thomas Gleixner | 0040bf3 | 2005-02-09 12:20:00 +0000 | [diff] [blame] | 2691 | /* Check, if we should skip the bad block table scan */ |
| 2692 | if (this->options & NAND_SKIP_BBTSCAN) |
| 2693 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2694 | |
| 2695 | /* Build bad block table */ |
| 2696 | return this->scan_bbt (mtd); |
| 2697 | } |
| 2698 | |
| 2699 | /** |
Thomas Gleixner | 61b03bd | 2005-11-07 11:15:49 +0000 | [diff] [blame^] | 2700 | * nand_release - [NAND Interface] Free resources held by the NAND device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2701 | * @mtd: MTD device structure |
| 2702 | */ |
| 2703 | void nand_release (struct mtd_info *mtd) |
| 2704 | { |
| 2705 | struct nand_chip *this = mtd->priv; |
| 2706 | |
| 2707 | #ifdef CONFIG_MTD_PARTITIONS |
| 2708 | /* Deregister partitions */ |
| 2709 | del_mtd_partitions (mtd); |
| 2710 | #endif |
| 2711 | /* Deregister the device */ |
| 2712 | del_mtd_device (mtd); |
| 2713 | |
| 2714 | /* Free bad block table memory, if allocated */ |
| 2715 | if (this->bbt) |
| 2716 | kfree (this->bbt); |
| 2717 | /* Buffer allocated by nand_scan ? */ |
| 2718 | if (this->options & NAND_OOBBUF_ALLOC) |
| 2719 | kfree (this->oob_buf); |
| 2720 | /* Buffer allocated by nand_scan ? */ |
| 2721 | if (this->options & NAND_DATABUF_ALLOC) |
| 2722 | kfree (this->data_buf); |
| 2723 | } |
| 2724 | |
Thomas Gleixner | d7e78d4 | 2005-06-17 16:02:09 +0100 | [diff] [blame] | 2725 | EXPORT_SYMBOL_GPL (nand_scan); |
| 2726 | EXPORT_SYMBOL_GPL (nand_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2727 | |
| 2728 | MODULE_LICENSE ("GPL"); |
| 2729 | MODULE_AUTHOR ("Steven J. Hill <sjhill@realitydiluted.com>, Thomas Gleixner <tglx@linutronix.de>"); |
| 2730 | MODULE_DESCRIPTION ("Generic NAND flash driver code"); |