David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 1 | /* |
| 2 | * davinci_nand.c - NAND Flash Driver for DaVinci family chips |
| 3 | * |
| 4 | * Copyright © 2006 Texas Instruments. |
| 5 | * |
| 6 | * Port to 2.6.23 Copyright © 2008 by: |
| 7 | * Sander Huijsen <Shuijsen@optelecom-nkf.com> |
| 8 | * Troy Kisky <troy.kisky@boundarydevices.com> |
| 9 | * Dirk Behme <Dirk.Behme@gmail.com> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/platform_device.h> |
| 30 | #include <linux/err.h> |
| 31 | #include <linux/clk.h> |
| 32 | #include <linux/io.h> |
| 33 | #include <linux/mtd/nand.h> |
| 34 | #include <linux/mtd/partitions.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 35 | #include <linux/slab.h> |
Heiko Schocher | cdeadd7 | 2012-07-30 09:22:24 +0200 | [diff] [blame] | 36 | #include <linux/of_device.h> |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 37 | |
Arnd Bergmann | ec2a083 | 2012-08-24 15:11:34 +0200 | [diff] [blame] | 38 | #include <linux/platform_data/mtd-davinci.h> |
| 39 | #include <linux/platform_data/mtd-davinci-aemif.h> |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 40 | |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 41 | /* |
| 42 | * This is a device driver for the NAND flash controller found on the |
| 43 | * various DaVinci family chips. It handles up to four SoC chipselects, |
| 44 | * and some flavors of secondary chipselect (e.g. based on A12) as used |
| 45 | * with multichip packages. |
| 46 | * |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 47 | * The 1-bit ECC hardware is supported, as well as the newer 4-bit ECC |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 48 | * available on chips like the DM355 and OMAP-L137 and needed with the |
| 49 | * more error-prone MLC NAND chips. |
| 50 | * |
| 51 | * This driver assumes EM_WAIT connects all the NAND devices' RDY/nBUSY |
| 52 | * outputs in a "wire-AND" configuration, with no per-chip signals. |
| 53 | */ |
| 54 | struct davinci_nand_info { |
| 55 | struct mtd_info mtd; |
| 56 | struct nand_chip chip; |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 57 | struct nand_ecclayout ecclayout; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 58 | |
| 59 | struct device *dev; |
| 60 | struct clk *clk; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 61 | |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 62 | bool is_readmode; |
| 63 | |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 64 | void __iomem *base; |
| 65 | void __iomem *vaddr; |
| 66 | |
| 67 | uint32_t ioaddr; |
| 68 | uint32_t current_cs; |
| 69 | |
| 70 | uint32_t mask_chipsel; |
| 71 | uint32_t mask_ale; |
| 72 | uint32_t mask_cle; |
| 73 | |
| 74 | uint32_t core_chipsel; |
Sekhar Nori | a88dbc5 | 2010-08-09 15:46:36 +0530 | [diff] [blame] | 75 | |
| 76 | struct davinci_aemif_timing *timing; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 77 | }; |
| 78 | |
| 79 | static DEFINE_SPINLOCK(davinci_nand_lock); |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 80 | static bool ecc4_busy; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 81 | |
| 82 | #define to_davinci_nand(m) container_of(m, struct davinci_nand_info, mtd) |
| 83 | |
| 84 | |
| 85 | static inline unsigned int davinci_nand_readl(struct davinci_nand_info *info, |
| 86 | int offset) |
| 87 | { |
| 88 | return __raw_readl(info->base + offset); |
| 89 | } |
| 90 | |
| 91 | static inline void davinci_nand_writel(struct davinci_nand_info *info, |
| 92 | int offset, unsigned long value) |
| 93 | { |
| 94 | __raw_writel(value, info->base + offset); |
| 95 | } |
| 96 | |
| 97 | /*----------------------------------------------------------------------*/ |
| 98 | |
| 99 | /* |
| 100 | * Access to hardware control lines: ALE, CLE, secondary chipselect. |
| 101 | */ |
| 102 | |
| 103 | static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd, |
| 104 | unsigned int ctrl) |
| 105 | { |
| 106 | struct davinci_nand_info *info = to_davinci_nand(mtd); |
| 107 | uint32_t addr = info->current_cs; |
| 108 | struct nand_chip *nand = mtd->priv; |
| 109 | |
| 110 | /* Did the control lines change? */ |
| 111 | if (ctrl & NAND_CTRL_CHANGE) { |
| 112 | if ((ctrl & NAND_CTRL_CLE) == NAND_CTRL_CLE) |
| 113 | addr |= info->mask_cle; |
| 114 | else if ((ctrl & NAND_CTRL_ALE) == NAND_CTRL_ALE) |
| 115 | addr |= info->mask_ale; |
| 116 | |
| 117 | nand->IO_ADDR_W = (void __iomem __force *)addr; |
| 118 | } |
| 119 | |
| 120 | if (cmd != NAND_CMD_NONE) |
| 121 | iowrite8(cmd, nand->IO_ADDR_W); |
| 122 | } |
| 123 | |
| 124 | static void nand_davinci_select_chip(struct mtd_info *mtd, int chip) |
| 125 | { |
| 126 | struct davinci_nand_info *info = to_davinci_nand(mtd); |
| 127 | uint32_t addr = info->ioaddr; |
| 128 | |
| 129 | /* maybe kick in a second chipselect */ |
| 130 | if (chip > 0) |
| 131 | addr |= info->mask_chipsel; |
| 132 | info->current_cs = addr; |
| 133 | |
| 134 | info->chip.IO_ADDR_W = (void __iomem __force *)addr; |
| 135 | info->chip.IO_ADDR_R = info->chip.IO_ADDR_W; |
| 136 | } |
| 137 | |
| 138 | /*----------------------------------------------------------------------*/ |
| 139 | |
| 140 | /* |
| 141 | * 1-bit hardware ECC ... context maintained for each core chipselect |
| 142 | */ |
| 143 | |
| 144 | static inline uint32_t nand_davinci_readecc_1bit(struct mtd_info *mtd) |
| 145 | { |
| 146 | struct davinci_nand_info *info = to_davinci_nand(mtd); |
| 147 | |
| 148 | return davinci_nand_readl(info, NANDF1ECC_OFFSET |
| 149 | + 4 * info->core_chipsel); |
| 150 | } |
| 151 | |
| 152 | static void nand_davinci_hwctl_1bit(struct mtd_info *mtd, int mode) |
| 153 | { |
| 154 | struct davinci_nand_info *info; |
| 155 | uint32_t nandcfr; |
| 156 | unsigned long flags; |
| 157 | |
| 158 | info = to_davinci_nand(mtd); |
| 159 | |
| 160 | /* Reset ECC hardware */ |
| 161 | nand_davinci_readecc_1bit(mtd); |
| 162 | |
| 163 | spin_lock_irqsave(&davinci_nand_lock, flags); |
| 164 | |
| 165 | /* Restart ECC hardware */ |
| 166 | nandcfr = davinci_nand_readl(info, NANDFCR_OFFSET); |
| 167 | nandcfr |= BIT(8 + info->core_chipsel); |
| 168 | davinci_nand_writel(info, NANDFCR_OFFSET, nandcfr); |
| 169 | |
| 170 | spin_unlock_irqrestore(&davinci_nand_lock, flags); |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * Read hardware ECC value and pack into three bytes |
| 175 | */ |
| 176 | static int nand_davinci_calculate_1bit(struct mtd_info *mtd, |
| 177 | const u_char *dat, u_char *ecc_code) |
| 178 | { |
| 179 | unsigned int ecc_val = nand_davinci_readecc_1bit(mtd); |
| 180 | unsigned int ecc24 = (ecc_val & 0x0fff) | ((ecc_val & 0x0fff0000) >> 4); |
| 181 | |
| 182 | /* invert so that erased block ecc is correct */ |
| 183 | ecc24 = ~ecc24; |
| 184 | ecc_code[0] = (u_char)(ecc24); |
| 185 | ecc_code[1] = (u_char)(ecc24 >> 8); |
| 186 | ecc_code[2] = (u_char)(ecc24 >> 16); |
| 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | static int nand_davinci_correct_1bit(struct mtd_info *mtd, u_char *dat, |
| 192 | u_char *read_ecc, u_char *calc_ecc) |
| 193 | { |
| 194 | struct nand_chip *chip = mtd->priv; |
| 195 | uint32_t eccNand = read_ecc[0] | (read_ecc[1] << 8) | |
| 196 | (read_ecc[2] << 16); |
| 197 | uint32_t eccCalc = calc_ecc[0] | (calc_ecc[1] << 8) | |
| 198 | (calc_ecc[2] << 16); |
| 199 | uint32_t diff = eccCalc ^ eccNand; |
| 200 | |
| 201 | if (diff) { |
| 202 | if ((((diff >> 12) ^ diff) & 0xfff) == 0xfff) { |
| 203 | /* Correctable error */ |
| 204 | if ((diff >> (12 + 3)) < chip->ecc.size) { |
| 205 | dat[diff >> (12 + 3)] ^= BIT((diff >> 12) & 7); |
| 206 | return 1; |
| 207 | } else { |
| 208 | return -1; |
| 209 | } |
| 210 | } else if (!(diff & (diff - 1))) { |
| 211 | /* Single bit ECC error in the ECC itself, |
| 212 | * nothing to fix */ |
| 213 | return 1; |
| 214 | } else { |
| 215 | /* Uncorrectable error */ |
| 216 | return -1; |
| 217 | } |
| 218 | |
| 219 | } |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | /*----------------------------------------------------------------------*/ |
| 224 | |
| 225 | /* |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 226 | * 4-bit hardware ECC ... context maintained over entire AEMIF |
| 227 | * |
| 228 | * This is a syndrome engine, but we avoid NAND_ECC_HW_SYNDROME |
| 229 | * since that forces use of a problematic "infix OOB" layout. |
| 230 | * Among other things, it trashes manufacturer bad block markers. |
| 231 | * Also, and specific to this hardware, it ECC-protects the "prepad" |
| 232 | * in the OOB ... while having ECC protection for parts of OOB would |
| 233 | * seem useful, the current MTD stack sometimes wants to update the |
| 234 | * OOB without recomputing ECC. |
| 235 | */ |
| 236 | |
| 237 | static void nand_davinci_hwctl_4bit(struct mtd_info *mtd, int mode) |
| 238 | { |
| 239 | struct davinci_nand_info *info = to_davinci_nand(mtd); |
| 240 | unsigned long flags; |
| 241 | u32 val; |
| 242 | |
| 243 | spin_lock_irqsave(&davinci_nand_lock, flags); |
| 244 | |
| 245 | /* Start 4-bit ECC calculation for read/write */ |
| 246 | val = davinci_nand_readl(info, NANDFCR_OFFSET); |
| 247 | val &= ~(0x03 << 4); |
| 248 | val |= (info->core_chipsel << 4) | BIT(12); |
| 249 | davinci_nand_writel(info, NANDFCR_OFFSET, val); |
| 250 | |
| 251 | info->is_readmode = (mode == NAND_ECC_READ); |
| 252 | |
| 253 | spin_unlock_irqrestore(&davinci_nand_lock, flags); |
| 254 | } |
| 255 | |
| 256 | /* Read raw ECC code after writing to NAND. */ |
| 257 | static void |
| 258 | nand_davinci_readecc_4bit(struct davinci_nand_info *info, u32 code[4]) |
| 259 | { |
| 260 | const u32 mask = 0x03ff03ff; |
| 261 | |
| 262 | code[0] = davinci_nand_readl(info, NAND_4BIT_ECC1_OFFSET) & mask; |
| 263 | code[1] = davinci_nand_readl(info, NAND_4BIT_ECC2_OFFSET) & mask; |
| 264 | code[2] = davinci_nand_readl(info, NAND_4BIT_ECC3_OFFSET) & mask; |
| 265 | code[3] = davinci_nand_readl(info, NAND_4BIT_ECC4_OFFSET) & mask; |
| 266 | } |
| 267 | |
| 268 | /* Terminate read ECC; or return ECC (as bytes) of data written to NAND. */ |
| 269 | static int nand_davinci_calculate_4bit(struct mtd_info *mtd, |
| 270 | const u_char *dat, u_char *ecc_code) |
| 271 | { |
| 272 | struct davinci_nand_info *info = to_davinci_nand(mtd); |
| 273 | u32 raw_ecc[4], *p; |
| 274 | unsigned i; |
| 275 | |
| 276 | /* After a read, terminate ECC calculation by a dummy read |
| 277 | * of some 4-bit ECC register. ECC covers everything that |
| 278 | * was read; correct() just uses the hardware state, so |
| 279 | * ecc_code is not needed. |
| 280 | */ |
| 281 | if (info->is_readmode) { |
| 282 | davinci_nand_readl(info, NAND_4BIT_ECC1_OFFSET); |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | /* Pack eight raw 10-bit ecc values into ten bytes, making |
| 287 | * two passes which each convert four values (in upper and |
| 288 | * lower halves of two 32-bit words) into five bytes. The |
| 289 | * ROM boot loader uses this same packing scheme. |
| 290 | */ |
| 291 | nand_davinci_readecc_4bit(info, raw_ecc); |
| 292 | for (i = 0, p = raw_ecc; i < 2; i++, p += 2) { |
| 293 | *ecc_code++ = p[0] & 0xff; |
| 294 | *ecc_code++ = ((p[0] >> 8) & 0x03) | ((p[0] >> 14) & 0xfc); |
| 295 | *ecc_code++ = ((p[0] >> 22) & 0x0f) | ((p[1] << 4) & 0xf0); |
| 296 | *ecc_code++ = ((p[1] >> 4) & 0x3f) | ((p[1] >> 10) & 0xc0); |
| 297 | *ecc_code++ = (p[1] >> 18) & 0xff; |
| 298 | } |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | /* Correct up to 4 bits in data we just read, using state left in the |
| 304 | * hardware plus the ecc_code computed when it was first written. |
| 305 | */ |
| 306 | static int nand_davinci_correct_4bit(struct mtd_info *mtd, |
| 307 | u_char *data, u_char *ecc_code, u_char *null) |
| 308 | { |
| 309 | int i; |
| 310 | struct davinci_nand_info *info = to_davinci_nand(mtd); |
| 311 | unsigned short ecc10[8]; |
| 312 | unsigned short *ecc16; |
| 313 | u32 syndrome[4]; |
Sudhakar Rajashekhara | 1c3275b | 2010-07-20 15:24:01 -0700 | [diff] [blame] | 314 | u32 ecc_state; |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 315 | unsigned num_errors, corrected; |
Wolfram Sang | 2bdb053 | 2010-09-03 12:35:37 +0200 | [diff] [blame] | 316 | unsigned long timeo; |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 317 | |
| 318 | /* All bytes 0xff? It's an erased page; ignore its ECC. */ |
| 319 | for (i = 0; i < 10; i++) { |
| 320 | if (ecc_code[i] != 0xff) |
| 321 | goto compare; |
| 322 | } |
| 323 | return 0; |
| 324 | |
| 325 | compare: |
| 326 | /* Unpack ten bytes into eight 10 bit values. We know we're |
| 327 | * little-endian, and use type punning for less shifting/masking. |
| 328 | */ |
| 329 | if (WARN_ON(0x01 & (unsigned) ecc_code)) |
| 330 | return -EINVAL; |
| 331 | ecc16 = (unsigned short *)ecc_code; |
| 332 | |
| 333 | ecc10[0] = (ecc16[0] >> 0) & 0x3ff; |
| 334 | ecc10[1] = ((ecc16[0] >> 10) & 0x3f) | ((ecc16[1] << 6) & 0x3c0); |
| 335 | ecc10[2] = (ecc16[1] >> 4) & 0x3ff; |
| 336 | ecc10[3] = ((ecc16[1] >> 14) & 0x3) | ((ecc16[2] << 2) & 0x3fc); |
| 337 | ecc10[4] = (ecc16[2] >> 8) | ((ecc16[3] << 8) & 0x300); |
| 338 | ecc10[5] = (ecc16[3] >> 2) & 0x3ff; |
| 339 | ecc10[6] = ((ecc16[3] >> 12) & 0xf) | ((ecc16[4] << 4) & 0x3f0); |
| 340 | ecc10[7] = (ecc16[4] >> 6) & 0x3ff; |
| 341 | |
| 342 | /* Tell ECC controller about the expected ECC codes. */ |
| 343 | for (i = 7; i >= 0; i--) |
| 344 | davinci_nand_writel(info, NAND_4BIT_ECC_LOAD_OFFSET, ecc10[i]); |
| 345 | |
| 346 | /* Allow time for syndrome calculation ... then read it. |
| 347 | * A syndrome of all zeroes 0 means no detected errors. |
| 348 | */ |
| 349 | davinci_nand_readl(info, NANDFSR_OFFSET); |
| 350 | nand_davinci_readecc_4bit(info, syndrome); |
| 351 | if (!(syndrome[0] | syndrome[1] | syndrome[2] | syndrome[3])) |
| 352 | return 0; |
| 353 | |
Sneha Narnakaje | f12a947 | 2009-09-18 12:51:48 -0700 | [diff] [blame] | 354 | /* |
| 355 | * Clear any previous address calculation by doing a dummy read of an |
| 356 | * error address register. |
| 357 | */ |
| 358 | davinci_nand_readl(info, NAND_ERR_ADD1_OFFSET); |
| 359 | |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 360 | /* Start address calculation, and wait for it to complete. |
| 361 | * We _could_ start reading more data while this is working, |
| 362 | * to speed up the overall page read. |
| 363 | */ |
| 364 | davinci_nand_writel(info, NANDFCR_OFFSET, |
| 365 | davinci_nand_readl(info, NANDFCR_OFFSET) | BIT(13)); |
Sudhakar Rajashekhara | 1c3275b | 2010-07-20 15:24:01 -0700 | [diff] [blame] | 366 | |
| 367 | /* |
| 368 | * ECC_STATE field reads 0x3 (Error correction complete) immediately |
| 369 | * after setting the 4BITECC_ADD_CALC_START bit. So if you immediately |
| 370 | * begin trying to poll for the state, you may fall right out of your |
| 371 | * loop without any of the correction calculations having taken place. |
Wolfram Sang | eea116e | 2010-08-25 14:18:20 +0200 | [diff] [blame] | 372 | * The recommendation from the hardware team is to initially delay as |
| 373 | * long as ECC_STATE reads less than 4. After that, ECC HW has entered |
| 374 | * correction state. |
Sudhakar Rajashekhara | 1c3275b | 2010-07-20 15:24:01 -0700 | [diff] [blame] | 375 | */ |
Wolfram Sang | 2bdb053 | 2010-09-03 12:35:37 +0200 | [diff] [blame] | 376 | timeo = jiffies + usecs_to_jiffies(100); |
Sudhakar Rajashekhara | 1c3275b | 2010-07-20 15:24:01 -0700 | [diff] [blame] | 377 | do { |
| 378 | ecc_state = (davinci_nand_readl(info, |
| 379 | NANDFSR_OFFSET) >> 8) & 0x0f; |
| 380 | cpu_relax(); |
| 381 | } while ((ecc_state < 4) && time_before(jiffies, timeo)); |
| 382 | |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 383 | for (;;) { |
| 384 | u32 fsr = davinci_nand_readl(info, NANDFSR_OFFSET); |
| 385 | |
| 386 | switch ((fsr >> 8) & 0x0f) { |
| 387 | case 0: /* no error, should not happen */ |
Sneha Narnakaje | f12a947 | 2009-09-18 12:51:48 -0700 | [diff] [blame] | 388 | davinci_nand_readl(info, NAND_ERR_ERRVAL1_OFFSET); |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 389 | return 0; |
| 390 | case 1: /* five or more errors detected */ |
Sneha Narnakaje | f12a947 | 2009-09-18 12:51:48 -0700 | [diff] [blame] | 391 | davinci_nand_readl(info, NAND_ERR_ERRVAL1_OFFSET); |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 392 | return -EIO; |
| 393 | case 2: /* error addresses computed */ |
| 394 | case 3: |
| 395 | num_errors = 1 + ((fsr >> 16) & 0x03); |
| 396 | goto correct; |
| 397 | default: /* still working on it */ |
| 398 | cpu_relax(); |
| 399 | continue; |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | correct: |
| 404 | /* correct each error */ |
| 405 | for (i = 0, corrected = 0; i < num_errors; i++) { |
| 406 | int error_address, error_value; |
| 407 | |
| 408 | if (i > 1) { |
| 409 | error_address = davinci_nand_readl(info, |
| 410 | NAND_ERR_ADD2_OFFSET); |
| 411 | error_value = davinci_nand_readl(info, |
| 412 | NAND_ERR_ERRVAL2_OFFSET); |
| 413 | } else { |
| 414 | error_address = davinci_nand_readl(info, |
| 415 | NAND_ERR_ADD1_OFFSET); |
| 416 | error_value = davinci_nand_readl(info, |
| 417 | NAND_ERR_ERRVAL1_OFFSET); |
| 418 | } |
| 419 | |
| 420 | if (i & 1) { |
| 421 | error_address >>= 16; |
| 422 | error_value >>= 16; |
| 423 | } |
| 424 | error_address &= 0x3ff; |
| 425 | error_address = (512 + 7) - error_address; |
| 426 | |
| 427 | if (error_address < 512) { |
| 428 | data[error_address] ^= error_value; |
| 429 | corrected++; |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | return corrected; |
| 434 | } |
| 435 | |
| 436 | /*----------------------------------------------------------------------*/ |
| 437 | |
| 438 | /* |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 439 | * NOTE: NAND boot requires ALE == EM_A[1], CLE == EM_A[2], so that's |
| 440 | * how these chips are normally wired. This translates to both 8 and 16 |
| 441 | * bit busses using ALE == BIT(3) in byte addresses, and CLE == BIT(4). |
| 442 | * |
| 443 | * For now we assume that configuration, or any other one which ignores |
| 444 | * the two LSBs for NAND access ... so we can issue 32-bit reads/writes |
| 445 | * and have that transparently morphed into multiple NAND operations. |
| 446 | */ |
| 447 | static void nand_davinci_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) |
| 448 | { |
| 449 | struct nand_chip *chip = mtd->priv; |
| 450 | |
| 451 | if ((0x03 & ((unsigned)buf)) == 0 && (0x03 & len) == 0) |
| 452 | ioread32_rep(chip->IO_ADDR_R, buf, len >> 2); |
| 453 | else if ((0x01 & ((unsigned)buf)) == 0 && (0x01 & len) == 0) |
| 454 | ioread16_rep(chip->IO_ADDR_R, buf, len >> 1); |
| 455 | else |
| 456 | ioread8_rep(chip->IO_ADDR_R, buf, len); |
| 457 | } |
| 458 | |
| 459 | static void nand_davinci_write_buf(struct mtd_info *mtd, |
| 460 | const uint8_t *buf, int len) |
| 461 | { |
| 462 | struct nand_chip *chip = mtd->priv; |
| 463 | |
| 464 | if ((0x03 & ((unsigned)buf)) == 0 && (0x03 & len) == 0) |
| 465 | iowrite32_rep(chip->IO_ADDR_R, buf, len >> 2); |
| 466 | else if ((0x01 & ((unsigned)buf)) == 0 && (0x01 & len) == 0) |
| 467 | iowrite16_rep(chip->IO_ADDR_R, buf, len >> 1); |
| 468 | else |
| 469 | iowrite8_rep(chip->IO_ADDR_R, buf, len); |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * Check hardware register for wait status. Returns 1 if device is ready, |
| 474 | * 0 if it is still busy. |
| 475 | */ |
| 476 | static int nand_davinci_dev_ready(struct mtd_info *mtd) |
| 477 | { |
| 478 | struct davinci_nand_info *info = to_davinci_nand(mtd); |
| 479 | |
| 480 | return davinci_nand_readl(info, NANDFSR_OFFSET) & BIT(0); |
| 481 | } |
| 482 | |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 483 | /*----------------------------------------------------------------------*/ |
| 484 | |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 485 | /* An ECC layout for using 4-bit ECC with small-page flash, storing |
| 486 | * ten ECC bytes plus the manufacturer's bad block marker byte, and |
| 487 | * and not overlapping the default BBT markers. |
| 488 | */ |
| 489 | static struct nand_ecclayout hwecc4_small __initconst = { |
| 490 | .eccbytes = 10, |
| 491 | .eccpos = { 0, 1, 2, 3, 4, |
| 492 | /* offset 5 holds the badblock marker */ |
| 493 | 6, 7, |
| 494 | 13, 14, 15, }, |
| 495 | .oobfree = { |
| 496 | {.offset = 8, .length = 5, }, |
| 497 | {.offset = 16, }, |
| 498 | }, |
| 499 | }; |
| 500 | |
Sneha Narnakaje | f12a947 | 2009-09-18 12:51:48 -0700 | [diff] [blame] | 501 | /* An ECC layout for using 4-bit ECC with large-page (2048bytes) flash, |
| 502 | * storing ten ECC bytes plus the manufacturer's bad block marker byte, |
| 503 | * and not overlapping the default BBT markers. |
| 504 | */ |
| 505 | static struct nand_ecclayout hwecc4_2048 __initconst = { |
| 506 | .eccbytes = 40, |
| 507 | .eccpos = { |
| 508 | /* at the end of spare sector */ |
| 509 | 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, |
| 510 | 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, |
| 511 | 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, |
| 512 | 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, |
| 513 | }, |
| 514 | .oobfree = { |
| 515 | /* 2 bytes at offset 0 hold manufacturer badblock markers */ |
| 516 | {.offset = 2, .length = 22, }, |
| 517 | /* 5 bytes at offset 8 hold BBT markers */ |
| 518 | /* 8 bytes at offset 16 hold JFFS2 clean markers */ |
| 519 | }, |
| 520 | }; |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 521 | |
Heiko Schocher | cdeadd7 | 2012-07-30 09:22:24 +0200 | [diff] [blame] | 522 | #if defined(CONFIG_OF) |
| 523 | static const struct of_device_id davinci_nand_of_match[] = { |
| 524 | {.compatible = "ti,davinci-nand", }, |
| 525 | {}, |
| 526 | } |
| 527 | MODULE_DEVICE_TABLE(of, davinci_nand_of_match); |
| 528 | |
| 529 | static struct davinci_nand_pdata |
| 530 | *nand_davinci_get_pdata(struct platform_device *pdev) |
| 531 | { |
| 532 | if (!pdev->dev.platform_data && pdev->dev.of_node) { |
| 533 | struct davinci_nand_pdata *pdata; |
| 534 | const char *mode; |
| 535 | u32 prop; |
| 536 | int len; |
| 537 | |
| 538 | pdata = devm_kzalloc(&pdev->dev, |
| 539 | sizeof(struct davinci_nand_pdata), |
| 540 | GFP_KERNEL); |
| 541 | pdev->dev.platform_data = pdata; |
| 542 | if (!pdata) |
| 543 | return NULL; |
| 544 | if (!of_property_read_u32(pdev->dev.of_node, |
| 545 | "ti,davinci-chipselect", &prop)) |
| 546 | pdev->id = prop; |
| 547 | if (!of_property_read_u32(pdev->dev.of_node, |
| 548 | "ti,davinci-mask-ale", &prop)) |
| 549 | pdata->mask_ale = prop; |
| 550 | if (!of_property_read_u32(pdev->dev.of_node, |
| 551 | "ti,davinci-mask-cle", &prop)) |
| 552 | pdata->mask_cle = prop; |
| 553 | if (!of_property_read_u32(pdev->dev.of_node, |
| 554 | "ti,davinci-mask-chipsel", &prop)) |
| 555 | pdata->mask_chipsel = prop; |
| 556 | if (!of_property_read_string(pdev->dev.of_node, |
| 557 | "ti,davinci-ecc-mode", &mode)) { |
| 558 | if (!strncmp("none", mode, 4)) |
| 559 | pdata->ecc_mode = NAND_ECC_NONE; |
| 560 | if (!strncmp("soft", mode, 4)) |
| 561 | pdata->ecc_mode = NAND_ECC_SOFT; |
| 562 | if (!strncmp("hw", mode, 2)) |
| 563 | pdata->ecc_mode = NAND_ECC_HW; |
| 564 | } |
| 565 | if (!of_property_read_u32(pdev->dev.of_node, |
| 566 | "ti,davinci-ecc-bits", &prop)) |
| 567 | pdata->ecc_bits = prop; |
| 568 | if (!of_property_read_u32(pdev->dev.of_node, |
| 569 | "ti,davinci-nand-buswidth", &prop)) |
| 570 | if (prop == 16) |
| 571 | pdata->options |= NAND_BUSWIDTH_16; |
| 572 | if (of_find_property(pdev->dev.of_node, |
| 573 | "ti,davinci-nand-use-bbt", &len)) |
| 574 | pdata->bbt_options = NAND_BBT_USE_FLASH; |
| 575 | } |
| 576 | |
| 577 | return pdev->dev.platform_data; |
| 578 | } |
| 579 | #else |
| 580 | #define davinci_nand_of_match NULL |
| 581 | static struct davinci_nand_pdata |
| 582 | *nand_davinci_get_pdata(struct platform_device *pdev) |
| 583 | { |
| 584 | return pdev->dev.platform_data; |
| 585 | } |
| 586 | #endif |
| 587 | |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 588 | static int __init nand_davinci_probe(struct platform_device *pdev) |
| 589 | { |
Heiko Schocher | cdeadd7 | 2012-07-30 09:22:24 +0200 | [diff] [blame] | 590 | struct davinci_nand_pdata *pdata; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 591 | struct davinci_nand_info *info; |
| 592 | struct resource *res1; |
| 593 | struct resource *res2; |
| 594 | void __iomem *vaddr; |
| 595 | void __iomem *base; |
| 596 | int ret; |
| 597 | uint32_t val; |
| 598 | nand_ecc_modes_t ecc_mode; |
| 599 | |
Heiko Schocher | cdeadd7 | 2012-07-30 09:22:24 +0200 | [diff] [blame] | 600 | pdata = nand_davinci_get_pdata(pdev); |
David Brownell | 533a014 | 2009-04-21 19:51:31 -0700 | [diff] [blame] | 601 | /* insist on board-specific configuration */ |
| 602 | if (!pdata) |
| 603 | return -ENODEV; |
| 604 | |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 605 | /* which external chipselect will we be managing? */ |
| 606 | if (pdev->id < 0 || pdev->id > 3) |
| 607 | return -ENODEV; |
| 608 | |
| 609 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
| 610 | if (!info) { |
| 611 | dev_err(&pdev->dev, "unable to allocate memory\n"); |
| 612 | ret = -ENOMEM; |
| 613 | goto err_nomem; |
| 614 | } |
| 615 | |
| 616 | platform_set_drvdata(pdev, info); |
| 617 | |
| 618 | res1 = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 619 | res2 = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 620 | if (!res1 || !res2) { |
| 621 | dev_err(&pdev->dev, "resource missing\n"); |
| 622 | ret = -EINVAL; |
| 623 | goto err_nomem; |
| 624 | } |
| 625 | |
H Hartley Sweeten | d8bc555 | 2009-12-14 16:13:13 -0500 | [diff] [blame] | 626 | vaddr = ioremap(res1->start, resource_size(res1)); |
| 627 | base = ioremap(res2->start, resource_size(res2)); |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 628 | if (!vaddr || !base) { |
| 629 | dev_err(&pdev->dev, "ioremap failed\n"); |
| 630 | ret = -EINVAL; |
| 631 | goto err_ioremap; |
| 632 | } |
| 633 | |
| 634 | info->dev = &pdev->dev; |
| 635 | info->base = base; |
| 636 | info->vaddr = vaddr; |
| 637 | |
| 638 | info->mtd.priv = &info->chip; |
| 639 | info->mtd.name = dev_name(&pdev->dev); |
| 640 | info->mtd.owner = THIS_MODULE; |
| 641 | |
David Brownell | 87f39f0 | 2009-03-26 00:42:50 -0700 | [diff] [blame] | 642 | info->mtd.dev.parent = &pdev->dev; |
| 643 | |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 644 | info->chip.IO_ADDR_R = vaddr; |
| 645 | info->chip.IO_ADDR_W = vaddr; |
| 646 | info->chip.chip_delay = 0; |
| 647 | info->chip.select_chip = nand_davinci_select_chip; |
| 648 | |
Brian Norris | bb9ebd4 | 2011-05-31 16:31:23 -0700 | [diff] [blame] | 649 | /* options such as NAND_BBT_USE_FLASH */ |
Brian Norris | a40f734 | 2011-05-31 16:31:22 -0700 | [diff] [blame] | 650 | info->chip.bbt_options = pdata->bbt_options; |
| 651 | /* options such as 16-bit widths */ |
David Brownell | 533a014 | 2009-04-21 19:51:31 -0700 | [diff] [blame] | 652 | info->chip.options = pdata->options; |
Mark A. Greer | f611a79 | 2009-10-12 16:16:37 -0700 | [diff] [blame] | 653 | info->chip.bbt_td = pdata->bbt_td; |
| 654 | info->chip.bbt_md = pdata->bbt_md; |
Sekhar Nori | a88dbc5 | 2010-08-09 15:46:36 +0530 | [diff] [blame] | 655 | info->timing = pdata->timing; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 656 | |
| 657 | info->ioaddr = (uint32_t __force) vaddr; |
| 658 | |
| 659 | info->current_cs = info->ioaddr; |
| 660 | info->core_chipsel = pdev->id; |
| 661 | info->mask_chipsel = pdata->mask_chipsel; |
| 662 | |
| 663 | /* use nandboot-capable ALE/CLE masks by default */ |
Hemant Pedanekar | 5cd0be8 | 2009-10-01 19:55:06 +0530 | [diff] [blame] | 664 | info->mask_ale = pdata->mask_ale ? : MASK_ALE; |
David Brownell | 533a014 | 2009-04-21 19:51:31 -0700 | [diff] [blame] | 665 | info->mask_cle = pdata->mask_cle ? : MASK_CLE; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 666 | |
| 667 | /* Set address of hardware control function */ |
| 668 | info->chip.cmd_ctrl = nand_davinci_hwcontrol; |
| 669 | info->chip.dev_ready = nand_davinci_dev_ready; |
| 670 | |
| 671 | /* Speed up buffer I/O */ |
| 672 | info->chip.read_buf = nand_davinci_read_buf; |
| 673 | info->chip.write_buf = nand_davinci_write_buf; |
| 674 | |
David Brownell | 533a014 | 2009-04-21 19:51:31 -0700 | [diff] [blame] | 675 | /* Use board-specific ECC config */ |
| 676 | ecc_mode = pdata->ecc_mode; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 677 | |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 678 | ret = -EINVAL; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 679 | switch (ecc_mode) { |
| 680 | case NAND_ECC_NONE: |
| 681 | case NAND_ECC_SOFT: |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 682 | pdata->ecc_bits = 0; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 683 | break; |
| 684 | case NAND_ECC_HW: |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 685 | if (pdata->ecc_bits == 4) { |
| 686 | /* No sanity checks: CPUs must support this, |
| 687 | * and the chips may not use NAND_BUSWIDTH_16. |
| 688 | */ |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 689 | |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 690 | /* No sharing 4-bit hardware between chipselects yet */ |
| 691 | spin_lock_irq(&davinci_nand_lock); |
| 692 | if (ecc4_busy) |
| 693 | ret = -EBUSY; |
| 694 | else |
| 695 | ecc4_busy = true; |
| 696 | spin_unlock_irq(&davinci_nand_lock); |
| 697 | |
| 698 | if (ret == -EBUSY) |
| 699 | goto err_ecc; |
| 700 | |
| 701 | info->chip.ecc.calculate = nand_davinci_calculate_4bit; |
| 702 | info->chip.ecc.correct = nand_davinci_correct_4bit; |
| 703 | info->chip.ecc.hwctl = nand_davinci_hwctl_4bit; |
| 704 | info->chip.ecc.bytes = 10; |
| 705 | } else { |
| 706 | info->chip.ecc.calculate = nand_davinci_calculate_1bit; |
| 707 | info->chip.ecc.correct = nand_davinci_correct_1bit; |
| 708 | info->chip.ecc.hwctl = nand_davinci_hwctl_1bit; |
| 709 | info->chip.ecc.bytes = 3; |
| 710 | } |
| 711 | info->chip.ecc.size = 512; |
Mike Dunn | 6a918ba | 2012-03-11 14:21:11 -0700 | [diff] [blame] | 712 | info->chip.ecc.strength = pdata->ecc_bits; |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 713 | break; |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 714 | default: |
| 715 | ret = -EINVAL; |
| 716 | goto err_ecc; |
| 717 | } |
| 718 | info->chip.ecc.mode = ecc_mode; |
| 719 | |
Kevin Hilman | cd24f8c | 2009-06-05 18:48:08 +0100 | [diff] [blame] | 720 | info->clk = clk_get(&pdev->dev, "aemif"); |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 721 | if (IS_ERR(info->clk)) { |
| 722 | ret = PTR_ERR(info->clk); |
Kevin Hilman | cd24f8c | 2009-06-05 18:48:08 +0100 | [diff] [blame] | 723 | dev_dbg(&pdev->dev, "unable to get AEMIF clock, err %d\n", ret); |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 724 | goto err_clk; |
| 725 | } |
| 726 | |
m-karicheri2@ti.com | ea73fe7 | 2012-09-12 21:06:19 +0000 | [diff] [blame] | 727 | ret = clk_prepare_enable(info->clk); |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 728 | if (ret < 0) { |
Kevin Hilman | cd24f8c | 2009-06-05 18:48:08 +0100 | [diff] [blame] | 729 | dev_dbg(&pdev->dev, "unable to enable AEMIF clock, err %d\n", |
| 730 | ret); |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 731 | goto err_clk_enable; |
| 732 | } |
| 733 | |
Sekhar Nori | a88dbc5 | 2010-08-09 15:46:36 +0530 | [diff] [blame] | 734 | /* |
| 735 | * Setup Async configuration register in case we did not boot from |
| 736 | * NAND and so bootloader did not bother to set it up. |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 737 | */ |
Sekhar Nori | a88dbc5 | 2010-08-09 15:46:36 +0530 | [diff] [blame] | 738 | val = davinci_nand_readl(info, A1CR_OFFSET + info->core_chipsel * 4); |
| 739 | |
| 740 | /* Extended Wait is not valid and Select Strobe mode is not used */ |
| 741 | val &= ~(ACR_ASIZE_MASK | ACR_EW_MASK | ACR_SS_MASK); |
| 742 | if (info->chip.options & NAND_BUSWIDTH_16) |
| 743 | val |= 0x1; |
| 744 | |
| 745 | davinci_nand_writel(info, A1CR_OFFSET + info->core_chipsel * 4, val); |
| 746 | |
Heiko Schocher | 47882d7 | 2011-12-04 10:37:36 +0100 | [diff] [blame] | 747 | ret = 0; |
| 748 | if (info->timing) |
| 749 | ret = davinci_aemif_setup_timing(info->timing, info->base, |
Sekhar Nori | a88dbc5 | 2010-08-09 15:46:36 +0530 | [diff] [blame] | 750 | info->core_chipsel); |
| 751 | if (ret < 0) { |
| 752 | dev_dbg(&pdev->dev, "NAND timing values setup fail\n"); |
| 753 | goto err_timing; |
| 754 | } |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 755 | |
| 756 | spin_lock_irq(&davinci_nand_lock); |
| 757 | |
| 758 | /* put CSxNAND into NAND mode */ |
| 759 | val = davinci_nand_readl(info, NANDFCR_OFFSET); |
| 760 | val |= BIT(info->core_chipsel); |
| 761 | davinci_nand_writel(info, NANDFCR_OFFSET, val); |
| 762 | |
| 763 | spin_unlock_irq(&davinci_nand_lock); |
| 764 | |
| 765 | /* Scan to find existence of the device(s) */ |
David Woodhouse | 5e81e88 | 2010-02-26 18:32:56 +0000 | [diff] [blame] | 766 | ret = nand_scan_ident(&info->mtd, pdata->mask_chipsel ? 2 : 1, NULL); |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 767 | if (ret < 0) { |
| 768 | dev_dbg(&pdev->dev, "no NAND chip(s) found\n"); |
| 769 | goto err_scan; |
| 770 | } |
| 771 | |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 772 | /* Update ECC layout if needed ... for 1-bit HW ECC, the default |
| 773 | * is OK, but it allocates 6 bytes when only 3 are needed (for |
| 774 | * each 512 bytes). For the 4-bit HW ECC, that default is not |
| 775 | * usable: 10 bytes are needed, not 6. |
| 776 | */ |
| 777 | if (pdata->ecc_bits == 4) { |
| 778 | int chunks = info->mtd.writesize / 512; |
| 779 | |
| 780 | if (!chunks || info->mtd.oobsize < 16) { |
| 781 | dev_dbg(&pdev->dev, "too small\n"); |
| 782 | ret = -EINVAL; |
| 783 | goto err_scan; |
| 784 | } |
| 785 | |
| 786 | /* For small page chips, preserve the manufacturer's |
| 787 | * badblock marking data ... and make sure a flash BBT |
| 788 | * table marker fits in the free bytes. |
| 789 | */ |
| 790 | if (chunks == 1) { |
| 791 | info->ecclayout = hwecc4_small; |
| 792 | info->ecclayout.oobfree[1].length = |
| 793 | info->mtd.oobsize - 16; |
| 794 | goto syndrome_done; |
| 795 | } |
Sneha Narnakaje | f12a947 | 2009-09-18 12:51:48 -0700 | [diff] [blame] | 796 | if (chunks == 4) { |
| 797 | info->ecclayout = hwecc4_2048; |
| 798 | info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST; |
| 799 | goto syndrome_done; |
| 800 | } |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 801 | |
Sneha Narnakaje | f12a947 | 2009-09-18 12:51:48 -0700 | [diff] [blame] | 802 | /* 4KiB page chips are not yet supported. The eccpos from |
| 803 | * nand_ecclayout cannot hold 80 bytes and change to eccpos[] |
| 804 | * breaks userspace ioctl interface with mtd-utils. Once we |
| 805 | * resolve this issue, NAND_ECC_HW_OOB_FIRST mode can be used |
| 806 | * for the 4KiB page chips. |
Brian Norris | cc26c3c | 2010-08-24 18:12:00 -0700 | [diff] [blame] | 807 | * |
| 808 | * TODO: Note that nand_ecclayout has now been expanded and can |
| 809 | * hold plenty of OOB entries. |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 810 | */ |
| 811 | dev_warn(&pdev->dev, "no 4-bit ECC support yet " |
Sneha Narnakaje | f12a947 | 2009-09-18 12:51:48 -0700 | [diff] [blame] | 812 | "for 4KiB-page NAND\n"); |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 813 | ret = -EIO; |
| 814 | goto err_scan; |
| 815 | |
| 816 | syndrome_done: |
| 817 | info->chip.ecc.layout = &info->ecclayout; |
| 818 | } |
| 819 | |
| 820 | ret = nand_scan_tail(&info->mtd); |
| 821 | if (ret < 0) |
| 822 | goto err_scan; |
| 823 | |
Artem Bityutskiy | 42d7fbe | 2012-03-09 19:24:26 +0200 | [diff] [blame] | 824 | ret = mtd_device_parse_register(&info->mtd, NULL, NULL, pdata->parts, |
| 825 | pdata->nr_parts); |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 826 | |
| 827 | if (ret < 0) |
| 828 | goto err_scan; |
| 829 | |
| 830 | val = davinci_nand_readl(info, NRCSR_OFFSET); |
| 831 | dev_info(&pdev->dev, "controller rev. %d.%d\n", |
| 832 | (val >> 8) & 0xff, val & 0xff); |
| 833 | |
| 834 | return 0; |
| 835 | |
| 836 | err_scan: |
Sekhar Nori | a88dbc5 | 2010-08-09 15:46:36 +0530 | [diff] [blame] | 837 | err_timing: |
m-karicheri2@ti.com | ea73fe7 | 2012-09-12 21:06:19 +0000 | [diff] [blame] | 838 | clk_disable_unprepare(info->clk); |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 839 | |
| 840 | err_clk_enable: |
| 841 | clk_put(info->clk); |
| 842 | |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 843 | spin_lock_irq(&davinci_nand_lock); |
| 844 | if (ecc_mode == NAND_ECC_HW_SYNDROME) |
| 845 | ecc4_busy = false; |
| 846 | spin_unlock_irq(&davinci_nand_lock); |
| 847 | |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 848 | err_ecc: |
| 849 | err_clk: |
| 850 | err_ioremap: |
| 851 | if (base) |
| 852 | iounmap(base); |
| 853 | if (vaddr) |
| 854 | iounmap(vaddr); |
| 855 | |
| 856 | err_nomem: |
| 857 | kfree(info); |
| 858 | return ret; |
| 859 | } |
| 860 | |
| 861 | static int __exit nand_davinci_remove(struct platform_device *pdev) |
| 862 | { |
| 863 | struct davinci_nand_info *info = platform_get_drvdata(pdev); |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 864 | |
David Brownell | 6a4123e | 2009-04-21 19:58:13 -0700 | [diff] [blame] | 865 | spin_lock_irq(&davinci_nand_lock); |
| 866 | if (info->chip.ecc.mode == NAND_ECC_HW_SYNDROME) |
| 867 | ecc4_busy = false; |
| 868 | spin_unlock_irq(&davinci_nand_lock); |
| 869 | |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 870 | iounmap(info->base); |
| 871 | iounmap(info->vaddr); |
| 872 | |
| 873 | nand_release(&info->mtd); |
| 874 | |
m-karicheri2@ti.com | ea73fe7 | 2012-09-12 21:06:19 +0000 | [diff] [blame] | 875 | clk_disable_unprepare(info->clk); |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 876 | clk_put(info->clk); |
| 877 | |
| 878 | kfree(info); |
| 879 | |
| 880 | return 0; |
| 881 | } |
| 882 | |
| 883 | static struct platform_driver nand_davinci_driver = { |
| 884 | .remove = __exit_p(nand_davinci_remove), |
| 885 | .driver = { |
| 886 | .name = "davinci_nand", |
Heiko Schocher | cdeadd7 | 2012-07-30 09:22:24 +0200 | [diff] [blame] | 887 | .owner = THIS_MODULE, |
| 888 | .of_match_table = davinci_nand_of_match, |
David Brownell | ff4569c | 2009-03-04 12:01:37 -0800 | [diff] [blame] | 889 | }, |
| 890 | }; |
| 891 | MODULE_ALIAS("platform:davinci_nand"); |
| 892 | |
| 893 | static int __init nand_davinci_init(void) |
| 894 | { |
| 895 | return platform_driver_probe(&nand_davinci_driver, nand_davinci_probe); |
| 896 | } |
| 897 | module_init(nand_davinci_init); |
| 898 | |
| 899 | static void __exit nand_davinci_exit(void) |
| 900 | { |
| 901 | platform_driver_unregister(&nand_davinci_driver); |
| 902 | } |
| 903 | module_exit(nand_davinci_exit); |
| 904 | |
| 905 | MODULE_LICENSE("GPL"); |
| 906 | MODULE_AUTHOR("Texas Instruments"); |
| 907 | MODULE_DESCRIPTION("Davinci NAND flash driver"); |
| 908 | |