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ff4569c7 DB |
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> | |
ff4569c7 DB |
27 | #include <linux/module.h> |
28 | #include <linux/platform_device.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/clk.h> | |
31 | #include <linux/io.h> | |
32 | #include <linux/mtd/nand.h> | |
33 | #include <linux/mtd/partitions.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
cdeadd71 | 35 | #include <linux/of_device.h> |
c4f8cde8 | 36 | #include <linux/of.h> |
ff4569c7 | 37 | |
ec2a0833 AB |
38 | #include <linux/platform_data/mtd-davinci.h> |
39 | #include <linux/platform_data/mtd-davinci-aemif.h> | |
ff4569c7 | 40 | |
ff4569c7 DB |
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 | * | |
6a4123e5 | 47 | * The 1-bit ECC hardware is supported, as well as the newer 4-bit ECC |
ff4569c7 DB |
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 { | |
ff4569c7 DB |
55 | struct nand_chip chip; |
56 | ||
57 | struct device *dev; | |
58 | struct clk *clk; | |
ff4569c7 | 59 | |
6a4123e5 DB |
60 | bool is_readmode; |
61 | ||
ff4569c7 DB |
62 | void __iomem *base; |
63 | void __iomem *vaddr; | |
64 | ||
65 | uint32_t ioaddr; | |
66 | uint32_t current_cs; | |
67 | ||
68 | uint32_t mask_chipsel; | |
69 | uint32_t mask_ale; | |
70 | uint32_t mask_cle; | |
71 | ||
72 | uint32_t core_chipsel; | |
a88dbc5b SN |
73 | |
74 | struct davinci_aemif_timing *timing; | |
ff4569c7 DB |
75 | }; |
76 | ||
77 | static DEFINE_SPINLOCK(davinci_nand_lock); | |
6a4123e5 | 78 | static bool ecc4_busy; |
ff4569c7 | 79 | |
a5cfb4db BB |
80 | static inline struct davinci_nand_info *to_davinci_nand(struct mtd_info *mtd) |
81 | { | |
82 | return container_of(mtd_to_nand(mtd), struct davinci_nand_info, chip); | |
83 | } | |
ff4569c7 DB |
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; | |
4bd4ebcc | 108 | struct nand_chip *nand = mtd_to_nand(mtd); |
ff4569c7 DB |
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 | { | |
4bd4ebcc | 194 | struct nand_chip *chip = mtd_to_nand(mtd); |
ff4569c7 DB |
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 { | |
6e941192 | 208 | return -EBADMSG; |
ff4569c7 DB |
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 */ | |
6e941192 | 216 | return -EBADMSG; |
ff4569c7 DB |
217 | } |
218 | ||
219 | } | |
220 | return 0; | |
221 | } | |
222 | ||
223 | /*----------------------------------------------------------------------*/ | |
224 | ||
6a4123e5 DB |
225 | /* |
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 | ||
f6d7c1b5 KB |
243 | /* Reset ECC hardware */ |
244 | davinci_nand_readl(info, NAND_4BIT_ECC1_OFFSET); | |
245 | ||
6a4123e5 DB |
246 | spin_lock_irqsave(&davinci_nand_lock, flags); |
247 | ||
248 | /* Start 4-bit ECC calculation for read/write */ | |
249 | val = davinci_nand_readl(info, NANDFCR_OFFSET); | |
250 | val &= ~(0x03 << 4); | |
251 | val |= (info->core_chipsel << 4) | BIT(12); | |
252 | davinci_nand_writel(info, NANDFCR_OFFSET, val); | |
253 | ||
254 | info->is_readmode = (mode == NAND_ECC_READ); | |
255 | ||
256 | spin_unlock_irqrestore(&davinci_nand_lock, flags); | |
257 | } | |
258 | ||
259 | /* Read raw ECC code after writing to NAND. */ | |
260 | static void | |
261 | nand_davinci_readecc_4bit(struct davinci_nand_info *info, u32 code[4]) | |
262 | { | |
263 | const u32 mask = 0x03ff03ff; | |
264 | ||
265 | code[0] = davinci_nand_readl(info, NAND_4BIT_ECC1_OFFSET) & mask; | |
266 | code[1] = davinci_nand_readl(info, NAND_4BIT_ECC2_OFFSET) & mask; | |
267 | code[2] = davinci_nand_readl(info, NAND_4BIT_ECC3_OFFSET) & mask; | |
268 | code[3] = davinci_nand_readl(info, NAND_4BIT_ECC4_OFFSET) & mask; | |
269 | } | |
270 | ||
271 | /* Terminate read ECC; or return ECC (as bytes) of data written to NAND. */ | |
272 | static int nand_davinci_calculate_4bit(struct mtd_info *mtd, | |
273 | const u_char *dat, u_char *ecc_code) | |
274 | { | |
275 | struct davinci_nand_info *info = to_davinci_nand(mtd); | |
276 | u32 raw_ecc[4], *p; | |
277 | unsigned i; | |
278 | ||
279 | /* After a read, terminate ECC calculation by a dummy read | |
280 | * of some 4-bit ECC register. ECC covers everything that | |
281 | * was read; correct() just uses the hardware state, so | |
282 | * ecc_code is not needed. | |
283 | */ | |
284 | if (info->is_readmode) { | |
285 | davinci_nand_readl(info, NAND_4BIT_ECC1_OFFSET); | |
286 | return 0; | |
287 | } | |
288 | ||
289 | /* Pack eight raw 10-bit ecc values into ten bytes, making | |
290 | * two passes which each convert four values (in upper and | |
291 | * lower halves of two 32-bit words) into five bytes. The | |
292 | * ROM boot loader uses this same packing scheme. | |
293 | */ | |
294 | nand_davinci_readecc_4bit(info, raw_ecc); | |
295 | for (i = 0, p = raw_ecc; i < 2; i++, p += 2) { | |
296 | *ecc_code++ = p[0] & 0xff; | |
297 | *ecc_code++ = ((p[0] >> 8) & 0x03) | ((p[0] >> 14) & 0xfc); | |
298 | *ecc_code++ = ((p[0] >> 22) & 0x0f) | ((p[1] << 4) & 0xf0); | |
299 | *ecc_code++ = ((p[1] >> 4) & 0x3f) | ((p[1] >> 10) & 0xc0); | |
300 | *ecc_code++ = (p[1] >> 18) & 0xff; | |
301 | } | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | /* Correct up to 4 bits in data we just read, using state left in the | |
307 | * hardware plus the ecc_code computed when it was first written. | |
308 | */ | |
309 | static int nand_davinci_correct_4bit(struct mtd_info *mtd, | |
310 | u_char *data, u_char *ecc_code, u_char *null) | |
311 | { | |
312 | int i; | |
313 | struct davinci_nand_info *info = to_davinci_nand(mtd); | |
314 | unsigned short ecc10[8]; | |
315 | unsigned short *ecc16; | |
316 | u32 syndrome[4]; | |
1c3275b6 | 317 | u32 ecc_state; |
6a4123e5 | 318 | unsigned num_errors, corrected; |
2bdb053a | 319 | unsigned long timeo; |
6a4123e5 | 320 | |
6a4123e5 DB |
321 | /* Unpack ten bytes into eight 10 bit values. We know we're |
322 | * little-endian, and use type punning for less shifting/masking. | |
323 | */ | |
324 | if (WARN_ON(0x01 & (unsigned) ecc_code)) | |
325 | return -EINVAL; | |
326 | ecc16 = (unsigned short *)ecc_code; | |
327 | ||
328 | ecc10[0] = (ecc16[0] >> 0) & 0x3ff; | |
329 | ecc10[1] = ((ecc16[0] >> 10) & 0x3f) | ((ecc16[1] << 6) & 0x3c0); | |
330 | ecc10[2] = (ecc16[1] >> 4) & 0x3ff; | |
331 | ecc10[3] = ((ecc16[1] >> 14) & 0x3) | ((ecc16[2] << 2) & 0x3fc); | |
332 | ecc10[4] = (ecc16[2] >> 8) | ((ecc16[3] << 8) & 0x300); | |
333 | ecc10[5] = (ecc16[3] >> 2) & 0x3ff; | |
334 | ecc10[6] = ((ecc16[3] >> 12) & 0xf) | ((ecc16[4] << 4) & 0x3f0); | |
335 | ecc10[7] = (ecc16[4] >> 6) & 0x3ff; | |
336 | ||
337 | /* Tell ECC controller about the expected ECC codes. */ | |
338 | for (i = 7; i >= 0; i--) | |
339 | davinci_nand_writel(info, NAND_4BIT_ECC_LOAD_OFFSET, ecc10[i]); | |
340 | ||
341 | /* Allow time for syndrome calculation ... then read it. | |
342 | * A syndrome of all zeroes 0 means no detected errors. | |
343 | */ | |
344 | davinci_nand_readl(info, NANDFSR_OFFSET); | |
345 | nand_davinci_readecc_4bit(info, syndrome); | |
346 | if (!(syndrome[0] | syndrome[1] | syndrome[2] | syndrome[3])) | |
347 | return 0; | |
348 | ||
f12a9473 SN |
349 | /* |
350 | * Clear any previous address calculation by doing a dummy read of an | |
351 | * error address register. | |
352 | */ | |
353 | davinci_nand_readl(info, NAND_ERR_ADD1_OFFSET); | |
354 | ||
6a4123e5 DB |
355 | /* Start address calculation, and wait for it to complete. |
356 | * We _could_ start reading more data while this is working, | |
357 | * to speed up the overall page read. | |
358 | */ | |
359 | davinci_nand_writel(info, NANDFCR_OFFSET, | |
360 | davinci_nand_readl(info, NANDFCR_OFFSET) | BIT(13)); | |
1c3275b6 SR |
361 | |
362 | /* | |
363 | * ECC_STATE field reads 0x3 (Error correction complete) immediately | |
364 | * after setting the 4BITECC_ADD_CALC_START bit. So if you immediately | |
365 | * begin trying to poll for the state, you may fall right out of your | |
366 | * loop without any of the correction calculations having taken place. | |
eea116ed WS |
367 | * The recommendation from the hardware team is to initially delay as |
368 | * long as ECC_STATE reads less than 4. After that, ECC HW has entered | |
369 | * correction state. | |
1c3275b6 | 370 | */ |
2bdb053a | 371 | timeo = jiffies + usecs_to_jiffies(100); |
1c3275b6 SR |
372 | do { |
373 | ecc_state = (davinci_nand_readl(info, | |
374 | NANDFSR_OFFSET) >> 8) & 0x0f; | |
375 | cpu_relax(); | |
376 | } while ((ecc_state < 4) && time_before(jiffies, timeo)); | |
377 | ||
6a4123e5 DB |
378 | for (;;) { |
379 | u32 fsr = davinci_nand_readl(info, NANDFSR_OFFSET); | |
380 | ||
381 | switch ((fsr >> 8) & 0x0f) { | |
382 | case 0: /* no error, should not happen */ | |
f12a9473 | 383 | davinci_nand_readl(info, NAND_ERR_ERRVAL1_OFFSET); |
6a4123e5 DB |
384 | return 0; |
385 | case 1: /* five or more errors detected */ | |
f12a9473 | 386 | davinci_nand_readl(info, NAND_ERR_ERRVAL1_OFFSET); |
6e941192 | 387 | return -EBADMSG; |
6a4123e5 DB |
388 | case 2: /* error addresses computed */ |
389 | case 3: | |
390 | num_errors = 1 + ((fsr >> 16) & 0x03); | |
391 | goto correct; | |
392 | default: /* still working on it */ | |
393 | cpu_relax(); | |
394 | continue; | |
395 | } | |
396 | } | |
397 | ||
398 | correct: | |
399 | /* correct each error */ | |
400 | for (i = 0, corrected = 0; i < num_errors; i++) { | |
401 | int error_address, error_value; | |
402 | ||
403 | if (i > 1) { | |
404 | error_address = davinci_nand_readl(info, | |
405 | NAND_ERR_ADD2_OFFSET); | |
406 | error_value = davinci_nand_readl(info, | |
407 | NAND_ERR_ERRVAL2_OFFSET); | |
408 | } else { | |
409 | error_address = davinci_nand_readl(info, | |
410 | NAND_ERR_ADD1_OFFSET); | |
411 | error_value = davinci_nand_readl(info, | |
412 | NAND_ERR_ERRVAL1_OFFSET); | |
413 | } | |
414 | ||
415 | if (i & 1) { | |
416 | error_address >>= 16; | |
417 | error_value >>= 16; | |
418 | } | |
419 | error_address &= 0x3ff; | |
420 | error_address = (512 + 7) - error_address; | |
421 | ||
422 | if (error_address < 512) { | |
423 | data[error_address] ^= error_value; | |
424 | corrected++; | |
425 | } | |
426 | } | |
427 | ||
428 | return corrected; | |
429 | } | |
430 | ||
431 | /*----------------------------------------------------------------------*/ | |
432 | ||
ff4569c7 DB |
433 | /* |
434 | * NOTE: NAND boot requires ALE == EM_A[1], CLE == EM_A[2], so that's | |
435 | * how these chips are normally wired. This translates to both 8 and 16 | |
436 | * bit busses using ALE == BIT(3) in byte addresses, and CLE == BIT(4). | |
437 | * | |
438 | * For now we assume that configuration, or any other one which ignores | |
439 | * the two LSBs for NAND access ... so we can issue 32-bit reads/writes | |
440 | * and have that transparently morphed into multiple NAND operations. | |
441 | */ | |
442 | static void nand_davinci_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) | |
443 | { | |
4bd4ebcc | 444 | struct nand_chip *chip = mtd_to_nand(mtd); |
ff4569c7 DB |
445 | |
446 | if ((0x03 & ((unsigned)buf)) == 0 && (0x03 & len) == 0) | |
447 | ioread32_rep(chip->IO_ADDR_R, buf, len >> 2); | |
448 | else if ((0x01 & ((unsigned)buf)) == 0 && (0x01 & len) == 0) | |
449 | ioread16_rep(chip->IO_ADDR_R, buf, len >> 1); | |
450 | else | |
451 | ioread8_rep(chip->IO_ADDR_R, buf, len); | |
452 | } | |
453 | ||
454 | static void nand_davinci_write_buf(struct mtd_info *mtd, | |
455 | const uint8_t *buf, int len) | |
456 | { | |
4bd4ebcc | 457 | struct nand_chip *chip = mtd_to_nand(mtd); |
ff4569c7 DB |
458 | |
459 | if ((0x03 & ((unsigned)buf)) == 0 && (0x03 & len) == 0) | |
460 | iowrite32_rep(chip->IO_ADDR_R, buf, len >> 2); | |
461 | else if ((0x01 & ((unsigned)buf)) == 0 && (0x01 & len) == 0) | |
462 | iowrite16_rep(chip->IO_ADDR_R, buf, len >> 1); | |
463 | else | |
464 | iowrite8_rep(chip->IO_ADDR_R, buf, len); | |
465 | } | |
466 | ||
467 | /* | |
468 | * Check hardware register for wait status. Returns 1 if device is ready, | |
469 | * 0 if it is still busy. | |
470 | */ | |
471 | static int nand_davinci_dev_ready(struct mtd_info *mtd) | |
472 | { | |
473 | struct davinci_nand_info *info = to_davinci_nand(mtd); | |
474 | ||
475 | return davinci_nand_readl(info, NANDFSR_OFFSET) & BIT(0); | |
476 | } | |
477 | ||
ff4569c7 DB |
478 | /*----------------------------------------------------------------------*/ |
479 | ||
6a4123e5 DB |
480 | /* An ECC layout for using 4-bit ECC with small-page flash, storing |
481 | * ten ECC bytes plus the manufacturer's bad block marker byte, and | |
482 | * and not overlapping the default BBT markers. | |
483 | */ | |
e4aacaa1 BB |
484 | static int hwecc4_ooblayout_small_ecc(struct mtd_info *mtd, int section, |
485 | struct mtd_oob_region *oobregion) | |
486 | { | |
487 | if (section > 2) | |
488 | return -ERANGE; | |
489 | ||
490 | if (!section) { | |
491 | oobregion->offset = 0; | |
492 | oobregion->length = 5; | |
493 | } else if (section == 1) { | |
494 | oobregion->offset = 6; | |
495 | oobregion->length = 2; | |
496 | } else { | |
497 | oobregion->offset = 13; | |
498 | oobregion->length = 3; | |
499 | } | |
6a4123e5 | 500 | |
e4aacaa1 BB |
501 | return 0; |
502 | } | |
6a4123e5 | 503 | |
e4aacaa1 BB |
504 | static int hwecc4_ooblayout_small_free(struct mtd_info *mtd, int section, |
505 | struct mtd_oob_region *oobregion) | |
506 | { | |
507 | if (section > 1) | |
508 | return -ERANGE; | |
509 | ||
510 | if (!section) { | |
511 | oobregion->offset = 8; | |
512 | oobregion->length = 5; | |
513 | } else { | |
514 | oobregion->offset = 16; | |
515 | oobregion->length = mtd->oobsize - 16; | |
516 | } | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | static const struct mtd_ooblayout_ops hwecc4_small_ooblayout_ops = { | |
522 | .ecc = hwecc4_ooblayout_small_ecc, | |
523 | .free = hwecc4_ooblayout_small_free, | |
a11244c0 SP |
524 | }; |
525 | ||
cdeadd71 HS |
526 | #if defined(CONFIG_OF) |
527 | static const struct of_device_id davinci_nand_of_match[] = { | |
528 | {.compatible = "ti,davinci-nand", }, | |
28c015a9 | 529 | {.compatible = "ti,keystone-nand", }, |
cdeadd71 | 530 | {}, |
13daa22f | 531 | }; |
cdeadd71 HS |
532 | MODULE_DEVICE_TABLE(of, davinci_nand_of_match); |
533 | ||
534 | static struct davinci_nand_pdata | |
535 | *nand_davinci_get_pdata(struct platform_device *pdev) | |
536 | { | |
453810b7 | 537 | if (!dev_get_platdata(&pdev->dev) && pdev->dev.of_node) { |
cdeadd71 HS |
538 | struct davinci_nand_pdata *pdata; |
539 | const char *mode; | |
540 | u32 prop; | |
cdeadd71 HS |
541 | |
542 | pdata = devm_kzalloc(&pdev->dev, | |
543 | sizeof(struct davinci_nand_pdata), | |
544 | GFP_KERNEL); | |
545 | pdev->dev.platform_data = pdata; | |
546 | if (!pdata) | |
f735a4d0 | 547 | return ERR_PTR(-ENOMEM); |
cdeadd71 HS |
548 | if (!of_property_read_u32(pdev->dev.of_node, |
549 | "ti,davinci-chipselect", &prop)) | |
550 | pdev->id = prop; | |
05103825 IK |
551 | else |
552 | return ERR_PTR(-EINVAL); | |
553 | ||
cdeadd71 HS |
554 | if (!of_property_read_u32(pdev->dev.of_node, |
555 | "ti,davinci-mask-ale", &prop)) | |
556 | pdata->mask_ale = prop; | |
557 | if (!of_property_read_u32(pdev->dev.of_node, | |
558 | "ti,davinci-mask-cle", &prop)) | |
559 | pdata->mask_cle = prop; | |
560 | if (!of_property_read_u32(pdev->dev.of_node, | |
561 | "ti,davinci-mask-chipsel", &prop)) | |
562 | pdata->mask_chipsel = prop; | |
563 | if (!of_property_read_string(pdev->dev.of_node, | |
564 | "ti,davinci-ecc-mode", &mode)) { | |
565 | if (!strncmp("none", mode, 4)) | |
566 | pdata->ecc_mode = NAND_ECC_NONE; | |
567 | if (!strncmp("soft", mode, 4)) | |
568 | pdata->ecc_mode = NAND_ECC_SOFT; | |
569 | if (!strncmp("hw", mode, 2)) | |
570 | pdata->ecc_mode = NAND_ECC_HW; | |
571 | } | |
572 | if (!of_property_read_u32(pdev->dev.of_node, | |
573 | "ti,davinci-ecc-bits", &prop)) | |
574 | pdata->ecc_bits = prop; | |
75be1ea2 | 575 | |
363b5db2 BB |
576 | if (!of_property_read_u32(pdev->dev.of_node, |
577 | "ti,davinci-nand-buswidth", &prop) && prop == 16) | |
578 | pdata->options |= NAND_BUSWIDTH_16; | |
579 | ||
75be1ea2 | 580 | if (of_property_read_bool(pdev->dev.of_node, |
75be1ea2 | 581 | "ti,davinci-nand-use-bbt")) |
cdeadd71 | 582 | pdata->bbt_options = NAND_BBT_USE_FLASH; |
28c015a9 MK |
583 | |
584 | if (of_device_is_compatible(pdev->dev.of_node, | |
585 | "ti,keystone-nand")) { | |
586 | pdata->options |= NAND_NO_SUBPAGE_WRITE; | |
587 | } | |
cdeadd71 HS |
588 | } |
589 | ||
453810b7 | 590 | return dev_get_platdata(&pdev->dev); |
cdeadd71 HS |
591 | } |
592 | #else | |
cdeadd71 HS |
593 | static struct davinci_nand_pdata |
594 | *nand_davinci_get_pdata(struct platform_device *pdev) | |
595 | { | |
453810b7 | 596 | return dev_get_platdata(&pdev->dev); |
cdeadd71 HS |
597 | } |
598 | #endif | |
599 | ||
eaaa4a9a | 600 | static int nand_davinci_probe(struct platform_device *pdev) |
ff4569c7 | 601 | { |
cdeadd71 | 602 | struct davinci_nand_pdata *pdata; |
ff4569c7 DB |
603 | struct davinci_nand_info *info; |
604 | struct resource *res1; | |
605 | struct resource *res2; | |
606 | void __iomem *vaddr; | |
607 | void __iomem *base; | |
608 | int ret; | |
609 | uint32_t val; | |
a5cfb4db | 610 | struct mtd_info *mtd; |
ff4569c7 | 611 | |
cdeadd71 | 612 | pdata = nand_davinci_get_pdata(pdev); |
f735a4d0 IK |
613 | if (IS_ERR(pdata)) |
614 | return PTR_ERR(pdata); | |
615 | ||
533a0149 DB |
616 | /* insist on board-specific configuration */ |
617 | if (!pdata) | |
618 | return -ENODEV; | |
619 | ||
ff4569c7 DB |
620 | /* which external chipselect will we be managing? */ |
621 | if (pdev->id < 0 || pdev->id > 3) | |
622 | return -ENODEV; | |
623 | ||
ef4e0c21 | 624 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); |
00669231 | 625 | if (!info) |
30a3970c | 626 | return -ENOMEM; |
ff4569c7 DB |
627 | |
628 | platform_set_drvdata(pdev, info); | |
629 | ||
630 | res1 = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
631 | res2 = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
632 | if (!res1 || !res2) { | |
633 | dev_err(&pdev->dev, "resource missing\n"); | |
30a3970c | 634 | return -EINVAL; |
ff4569c7 DB |
635 | } |
636 | ||
59bff7fb | 637 | vaddr = devm_ioremap_resource(&pdev->dev, res1); |
30a3970c IK |
638 | if (IS_ERR(vaddr)) |
639 | return PTR_ERR(vaddr); | |
640 | ||
0966a416 IK |
641 | /* |
642 | * This registers range is used to setup NAND settings. In case with | |
643 | * TI AEMIF driver, the same memory address range is requested already | |
644 | * by AEMIF, so we cannot request it twice, just ioremap. | |
645 | * The AEMIF and NAND drivers not use the same registers in this range. | |
646 | */ | |
647 | base = devm_ioremap(&pdev->dev, res2->start, resource_size(res2)); | |
648 | if (!base) { | |
649 | dev_err(&pdev->dev, "ioremap failed for resource %pR\n", res2); | |
650 | return -EADDRNOTAVAIL; | |
651 | } | |
ff4569c7 DB |
652 | |
653 | info->dev = &pdev->dev; | |
654 | info->base = base; | |
655 | info->vaddr = vaddr; | |
656 | ||
a5cfb4db | 657 | mtd = nand_to_mtd(&info->chip); |
a5cfb4db | 658 | mtd->dev.parent = &pdev->dev; |
a61ae81a | 659 | nand_set_flash_node(&info->chip, pdev->dev.of_node); |
87f39f04 | 660 | |
ff4569c7 DB |
661 | info->chip.IO_ADDR_R = vaddr; |
662 | info->chip.IO_ADDR_W = vaddr; | |
663 | info->chip.chip_delay = 0; | |
664 | info->chip.select_chip = nand_davinci_select_chip; | |
665 | ||
bb9ebd4e | 666 | /* options such as NAND_BBT_USE_FLASH */ |
a40f7341 BN |
667 | info->chip.bbt_options = pdata->bbt_options; |
668 | /* options such as 16-bit widths */ | |
533a0149 | 669 | info->chip.options = pdata->options; |
f611a79f MG |
670 | info->chip.bbt_td = pdata->bbt_td; |
671 | info->chip.bbt_md = pdata->bbt_md; | |
a88dbc5b | 672 | info->timing = pdata->timing; |
ff4569c7 DB |
673 | |
674 | info->ioaddr = (uint32_t __force) vaddr; | |
675 | ||
676 | info->current_cs = info->ioaddr; | |
677 | info->core_chipsel = pdev->id; | |
678 | info->mask_chipsel = pdata->mask_chipsel; | |
679 | ||
680 | /* use nandboot-capable ALE/CLE masks by default */ | |
5cd0be8e | 681 | info->mask_ale = pdata->mask_ale ? : MASK_ALE; |
533a0149 | 682 | info->mask_cle = pdata->mask_cle ? : MASK_CLE; |
ff4569c7 DB |
683 | |
684 | /* Set address of hardware control function */ | |
685 | info->chip.cmd_ctrl = nand_davinci_hwcontrol; | |
686 | info->chip.dev_ready = nand_davinci_dev_ready; | |
687 | ||
688 | /* Speed up buffer I/O */ | |
689 | info->chip.read_buf = nand_davinci_read_buf; | |
690 | info->chip.write_buf = nand_davinci_write_buf; | |
691 | ||
533a0149 | 692 | /* Use board-specific ECC config */ |
363b5db2 | 693 | info->chip.ecc.mode = pdata->ecc_mode; |
ff4569c7 | 694 | |
6a4123e5 | 695 | ret = -EINVAL; |
363b5db2 BB |
696 | |
697 | info->clk = devm_clk_get(&pdev->dev, "aemif"); | |
698 | if (IS_ERR(info->clk)) { | |
699 | ret = PTR_ERR(info->clk); | |
700 | dev_dbg(&pdev->dev, "unable to get AEMIF clock, err %d\n", ret); | |
701 | return ret; | |
702 | } | |
703 | ||
704 | ret = clk_prepare_enable(info->clk); | |
705 | if (ret < 0) { | |
706 | dev_dbg(&pdev->dev, "unable to enable AEMIF clock, err %d\n", | |
707 | ret); | |
708 | goto err_clk_enable; | |
709 | } | |
710 | ||
711 | spin_lock_irq(&davinci_nand_lock); | |
712 | ||
713 | /* put CSxNAND into NAND mode */ | |
714 | val = davinci_nand_readl(info, NANDFCR_OFFSET); | |
715 | val |= BIT(info->core_chipsel); | |
716 | davinci_nand_writel(info, NANDFCR_OFFSET, val); | |
717 | ||
718 | spin_unlock_irq(&davinci_nand_lock); | |
719 | ||
720 | /* Scan to find existence of the device(s) */ | |
721 | ret = nand_scan_ident(mtd, pdata->mask_chipsel ? 2 : 1, NULL); | |
722 | if (ret < 0) { | |
723 | dev_dbg(&pdev->dev, "no NAND chip(s) found\n"); | |
724 | goto err; | |
725 | } | |
726 | ||
727 | switch (info->chip.ecc.mode) { | |
ff4569c7 | 728 | case NAND_ECC_NONE: |
867f9873 RM |
729 | pdata->ecc_bits = 0; |
730 | break; | |
ff4569c7 | 731 | case NAND_ECC_SOFT: |
6a4123e5 | 732 | pdata->ecc_bits = 0; |
867f9873 RM |
733 | /* |
734 | * This driver expects Hamming based ECC when ecc_mode is set | |
735 | * to NAND_ECC_SOFT. Force ecc.algo to NAND_ECC_HAMMING to | |
736 | * avoid adding an extra ->ecc_algo field to | |
737 | * davinci_nand_pdata. | |
738 | */ | |
739 | info->chip.ecc.algo = NAND_ECC_HAMMING; | |
ff4569c7 DB |
740 | break; |
741 | case NAND_ECC_HW: | |
6a4123e5 DB |
742 | if (pdata->ecc_bits == 4) { |
743 | /* No sanity checks: CPUs must support this, | |
744 | * and the chips may not use NAND_BUSWIDTH_16. | |
745 | */ | |
746 | ||
747 | /* No sharing 4-bit hardware between chipselects yet */ | |
748 | spin_lock_irq(&davinci_nand_lock); | |
749 | if (ecc4_busy) | |
750 | ret = -EBUSY; | |
751 | else | |
752 | ecc4_busy = true; | |
753 | spin_unlock_irq(&davinci_nand_lock); | |
754 | ||
755 | if (ret == -EBUSY) | |
30a3970c | 756 | return ret; |
6a4123e5 DB |
757 | |
758 | info->chip.ecc.calculate = nand_davinci_calculate_4bit; | |
759 | info->chip.ecc.correct = nand_davinci_correct_4bit; | |
760 | info->chip.ecc.hwctl = nand_davinci_hwctl_4bit; | |
761 | info->chip.ecc.bytes = 10; | |
bc29c95d | 762 | info->chip.ecc.options = NAND_ECC_GENERIC_ERASED_CHECK; |
6a4123e5 DB |
763 | } else { |
764 | info->chip.ecc.calculate = nand_davinci_calculate_1bit; | |
765 | info->chip.ecc.correct = nand_davinci_correct_1bit; | |
766 | info->chip.ecc.hwctl = nand_davinci_hwctl_1bit; | |
767 | info->chip.ecc.bytes = 3; | |
768 | } | |
ff4569c7 | 769 | info->chip.ecc.size = 512; |
6a918bad | 770 | info->chip.ecc.strength = pdata->ecc_bits; |
ff4569c7 | 771 | break; |
ff4569c7 | 772 | default: |
30a3970c | 773 | return -EINVAL; |
ff4569c7 | 774 | } |
ff4569c7 | 775 | |
6a4123e5 DB |
776 | /* Update ECC layout if needed ... for 1-bit HW ECC, the default |
777 | * is OK, but it allocates 6 bytes when only 3 are needed (for | |
778 | * each 512 bytes). For the 4-bit HW ECC, that default is not | |
779 | * usable: 10 bytes are needed, not 6. | |
780 | */ | |
781 | if (pdata->ecc_bits == 4) { | |
a5cfb4db | 782 | int chunks = mtd->writesize / 512; |
6a4123e5 | 783 | |
a5cfb4db | 784 | if (!chunks || mtd->oobsize < 16) { |
6a4123e5 DB |
785 | dev_dbg(&pdev->dev, "too small\n"); |
786 | ret = -EINVAL; | |
30a3970c | 787 | goto err; |
6a4123e5 DB |
788 | } |
789 | ||
790 | /* For small page chips, preserve the manufacturer's | |
791 | * badblock marking data ... and make sure a flash BBT | |
792 | * table marker fits in the free bytes. | |
793 | */ | |
794 | if (chunks == 1) { | |
e4aacaa1 BB |
795 | mtd_set_ooblayout(mtd, &hwecc4_small_ooblayout_ops); |
796 | } else if (chunks == 4 || chunks == 8) { | |
797 | mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops); | |
a11244c0 | 798 | info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST; |
e4aacaa1 BB |
799 | } else { |
800 | ret = -EIO; | |
801 | goto err; | |
a11244c0 | 802 | } |
6a4123e5 DB |
803 | } |
804 | ||
a5cfb4db | 805 | ret = nand_scan_tail(mtd); |
6a4123e5 | 806 | if (ret < 0) |
30a3970c | 807 | goto err; |
6a4123e5 | 808 | |
192afdbf | 809 | if (pdata->parts) |
a5cfb4db | 810 | ret = mtd_device_parse_register(mtd, NULL, NULL, |
192afdbf | 811 | pdata->parts, pdata->nr_parts); |
a61ae81a | 812 | else |
a5cfb4db | 813 | ret = mtd_device_register(mtd, NULL, 0); |
ff4569c7 | 814 | if (ret < 0) |
30a3970c | 815 | goto err; |
ff4569c7 DB |
816 | |
817 | val = davinci_nand_readl(info, NRCSR_OFFSET); | |
818 | dev_info(&pdev->dev, "controller rev. %d.%d\n", | |
819 | (val >> 8) & 0xff, val & 0xff); | |
820 | ||
821 | return 0; | |
822 | ||
30a3970c | 823 | err: |
ea73fe7f | 824 | clk_disable_unprepare(info->clk); |
ff4569c7 DB |
825 | |
826 | err_clk_enable: | |
6a4123e5 | 827 | spin_lock_irq(&davinci_nand_lock); |
363b5db2 | 828 | if (info->chip.ecc.mode == NAND_ECC_HW_SYNDROME) |
6a4123e5 DB |
829 | ecc4_busy = false; |
830 | spin_unlock_irq(&davinci_nand_lock); | |
ff4569c7 DB |
831 | return ret; |
832 | } | |
833 | ||
eaaa4a9a | 834 | static int nand_davinci_remove(struct platform_device *pdev) |
ff4569c7 DB |
835 | { |
836 | struct davinci_nand_info *info = platform_get_drvdata(pdev); | |
ff4569c7 | 837 | |
6a4123e5 DB |
838 | spin_lock_irq(&davinci_nand_lock); |
839 | if (info->chip.ecc.mode == NAND_ECC_HW_SYNDROME) | |
840 | ecc4_busy = false; | |
841 | spin_unlock_irq(&davinci_nand_lock); | |
842 | ||
a5cfb4db | 843 | nand_release(nand_to_mtd(&info->chip)); |
ff4569c7 | 844 | |
ea73fe7f | 845 | clk_disable_unprepare(info->clk); |
ff4569c7 DB |
846 | |
847 | return 0; | |
848 | } | |
849 | ||
850 | static struct platform_driver nand_davinci_driver = { | |
eaaa4a9a IK |
851 | .probe = nand_davinci_probe, |
852 | .remove = nand_davinci_remove, | |
ff4569c7 DB |
853 | .driver = { |
854 | .name = "davinci_nand", | |
c4f8cde8 | 855 | .of_match_table = of_match_ptr(davinci_nand_of_match), |
ff4569c7 DB |
856 | }, |
857 | }; | |
858 | MODULE_ALIAS("platform:davinci_nand"); | |
859 | ||
eaaa4a9a | 860 | module_platform_driver(nand_davinci_driver); |
ff4569c7 DB |
861 | |
862 | MODULE_LICENSE("GPL"); | |
863 | MODULE_AUTHOR("Texas Instruments"); | |
864 | MODULE_DESCRIPTION("Davinci NAND flash driver"); | |
865 |