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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> | |
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> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
ff4569c7 | 36 | |
ff4569c7 | 37 | #include <mach/nand.h> |
8060ef4d | 38 | #include <mach/aemif.h> |
ff4569c7 | 39 | |
ff4569c7 DB |
40 | /* |
41 | * This is a device driver for the NAND flash controller found on the | |
42 | * various DaVinci family chips. It handles up to four SoC chipselects, | |
43 | * and some flavors of secondary chipselect (e.g. based on A12) as used | |
44 | * with multichip packages. | |
45 | * | |
6a4123e5 | 46 | * The 1-bit ECC hardware is supported, as well as the newer 4-bit ECC |
ff4569c7 DB |
47 | * available on chips like the DM355 and OMAP-L137 and needed with the |
48 | * more error-prone MLC NAND chips. | |
49 | * | |
50 | * This driver assumes EM_WAIT connects all the NAND devices' RDY/nBUSY | |
51 | * outputs in a "wire-AND" configuration, with no per-chip signals. | |
52 | */ | |
53 | struct davinci_nand_info { | |
54 | struct mtd_info mtd; | |
55 | struct nand_chip chip; | |
6a4123e5 | 56 | struct nand_ecclayout ecclayout; |
ff4569c7 DB |
57 | |
58 | struct device *dev; | |
59 | struct clk *clk; | |
ff4569c7 | 60 | |
6a4123e5 DB |
61 | bool is_readmode; |
62 | ||
ff4569c7 DB |
63 | void __iomem *base; |
64 | void __iomem *vaddr; | |
65 | ||
66 | uint32_t ioaddr; | |
67 | uint32_t current_cs; | |
68 | ||
69 | uint32_t mask_chipsel; | |
70 | uint32_t mask_ale; | |
71 | uint32_t mask_cle; | |
72 | ||
73 | uint32_t core_chipsel; | |
a88dbc5b SN |
74 | |
75 | struct davinci_aemif_timing *timing; | |
ff4569c7 DB |
76 | }; |
77 | ||
78 | static DEFINE_SPINLOCK(davinci_nand_lock); | |
6a4123e5 | 79 | static bool ecc4_busy; |
ff4569c7 DB |
80 | |
81 | #define to_davinci_nand(m) container_of(m, struct davinci_nand_info, mtd) | |
82 | ||
83 | ||
84 | static inline unsigned int davinci_nand_readl(struct davinci_nand_info *info, | |
85 | int offset) | |
86 | { | |
87 | return __raw_readl(info->base + offset); | |
88 | } | |
89 | ||
90 | static inline void davinci_nand_writel(struct davinci_nand_info *info, | |
91 | int offset, unsigned long value) | |
92 | { | |
93 | __raw_writel(value, info->base + offset); | |
94 | } | |
95 | ||
96 | /*----------------------------------------------------------------------*/ | |
97 | ||
98 | /* | |
99 | * Access to hardware control lines: ALE, CLE, secondary chipselect. | |
100 | */ | |
101 | ||
102 | static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd, | |
103 | unsigned int ctrl) | |
104 | { | |
105 | struct davinci_nand_info *info = to_davinci_nand(mtd); | |
106 | uint32_t addr = info->current_cs; | |
107 | struct nand_chip *nand = mtd->priv; | |
108 | ||
109 | /* Did the control lines change? */ | |
110 | if (ctrl & NAND_CTRL_CHANGE) { | |
111 | if ((ctrl & NAND_CTRL_CLE) == NAND_CTRL_CLE) | |
112 | addr |= info->mask_cle; | |
113 | else if ((ctrl & NAND_CTRL_ALE) == NAND_CTRL_ALE) | |
114 | addr |= info->mask_ale; | |
115 | ||
116 | nand->IO_ADDR_W = (void __iomem __force *)addr; | |
117 | } | |
118 | ||
119 | if (cmd != NAND_CMD_NONE) | |
120 | iowrite8(cmd, nand->IO_ADDR_W); | |
121 | } | |
122 | ||
123 | static void nand_davinci_select_chip(struct mtd_info *mtd, int chip) | |
124 | { | |
125 | struct davinci_nand_info *info = to_davinci_nand(mtd); | |
126 | uint32_t addr = info->ioaddr; | |
127 | ||
128 | /* maybe kick in a second chipselect */ | |
129 | if (chip > 0) | |
130 | addr |= info->mask_chipsel; | |
131 | info->current_cs = addr; | |
132 | ||
133 | info->chip.IO_ADDR_W = (void __iomem __force *)addr; | |
134 | info->chip.IO_ADDR_R = info->chip.IO_ADDR_W; | |
135 | } | |
136 | ||
137 | /*----------------------------------------------------------------------*/ | |
138 | ||
139 | /* | |
140 | * 1-bit hardware ECC ... context maintained for each core chipselect | |
141 | */ | |
142 | ||
143 | static inline uint32_t nand_davinci_readecc_1bit(struct mtd_info *mtd) | |
144 | { | |
145 | struct davinci_nand_info *info = to_davinci_nand(mtd); | |
146 | ||
147 | return davinci_nand_readl(info, NANDF1ECC_OFFSET | |
148 | + 4 * info->core_chipsel); | |
149 | } | |
150 | ||
151 | static void nand_davinci_hwctl_1bit(struct mtd_info *mtd, int mode) | |
152 | { | |
153 | struct davinci_nand_info *info; | |
154 | uint32_t nandcfr; | |
155 | unsigned long flags; | |
156 | ||
157 | info = to_davinci_nand(mtd); | |
158 | ||
159 | /* Reset ECC hardware */ | |
160 | nand_davinci_readecc_1bit(mtd); | |
161 | ||
162 | spin_lock_irqsave(&davinci_nand_lock, flags); | |
163 | ||
164 | /* Restart ECC hardware */ | |
165 | nandcfr = davinci_nand_readl(info, NANDFCR_OFFSET); | |
166 | nandcfr |= BIT(8 + info->core_chipsel); | |
167 | davinci_nand_writel(info, NANDFCR_OFFSET, nandcfr); | |
168 | ||
169 | spin_unlock_irqrestore(&davinci_nand_lock, flags); | |
170 | } | |
171 | ||
172 | /* | |
173 | * Read hardware ECC value and pack into three bytes | |
174 | */ | |
175 | static int nand_davinci_calculate_1bit(struct mtd_info *mtd, | |
176 | const u_char *dat, u_char *ecc_code) | |
177 | { | |
178 | unsigned int ecc_val = nand_davinci_readecc_1bit(mtd); | |
179 | unsigned int ecc24 = (ecc_val & 0x0fff) | ((ecc_val & 0x0fff0000) >> 4); | |
180 | ||
181 | /* invert so that erased block ecc is correct */ | |
182 | ecc24 = ~ecc24; | |
183 | ecc_code[0] = (u_char)(ecc24); | |
184 | ecc_code[1] = (u_char)(ecc24 >> 8); | |
185 | ecc_code[2] = (u_char)(ecc24 >> 16); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static int nand_davinci_correct_1bit(struct mtd_info *mtd, u_char *dat, | |
191 | u_char *read_ecc, u_char *calc_ecc) | |
192 | { | |
193 | struct nand_chip *chip = mtd->priv; | |
194 | uint32_t eccNand = read_ecc[0] | (read_ecc[1] << 8) | | |
195 | (read_ecc[2] << 16); | |
196 | uint32_t eccCalc = calc_ecc[0] | (calc_ecc[1] << 8) | | |
197 | (calc_ecc[2] << 16); | |
198 | uint32_t diff = eccCalc ^ eccNand; | |
199 | ||
200 | if (diff) { | |
201 | if ((((diff >> 12) ^ diff) & 0xfff) == 0xfff) { | |
202 | /* Correctable error */ | |
203 | if ((diff >> (12 + 3)) < chip->ecc.size) { | |
204 | dat[diff >> (12 + 3)] ^= BIT((diff >> 12) & 7); | |
205 | return 1; | |
206 | } else { | |
207 | return -1; | |
208 | } | |
209 | } else if (!(diff & (diff - 1))) { | |
210 | /* Single bit ECC error in the ECC itself, | |
211 | * nothing to fix */ | |
212 | return 1; | |
213 | } else { | |
214 | /* Uncorrectable error */ | |
215 | return -1; | |
216 | } | |
217 | ||
218 | } | |
219 | return 0; | |
220 | } | |
221 | ||
222 | /*----------------------------------------------------------------------*/ | |
223 | ||
6a4123e5 DB |
224 | /* |
225 | * 4-bit hardware ECC ... context maintained over entire AEMIF | |
226 | * | |
227 | * This is a syndrome engine, but we avoid NAND_ECC_HW_SYNDROME | |
228 | * since that forces use of a problematic "infix OOB" layout. | |
229 | * Among other things, it trashes manufacturer bad block markers. | |
230 | * Also, and specific to this hardware, it ECC-protects the "prepad" | |
231 | * in the OOB ... while having ECC protection for parts of OOB would | |
232 | * seem useful, the current MTD stack sometimes wants to update the | |
233 | * OOB without recomputing ECC. | |
234 | */ | |
235 | ||
236 | static void nand_davinci_hwctl_4bit(struct mtd_info *mtd, int mode) | |
237 | { | |
238 | struct davinci_nand_info *info = to_davinci_nand(mtd); | |
239 | unsigned long flags; | |
240 | u32 val; | |
241 | ||
242 | spin_lock_irqsave(&davinci_nand_lock, flags); | |
243 | ||
244 | /* Start 4-bit ECC calculation for read/write */ | |
245 | val = davinci_nand_readl(info, NANDFCR_OFFSET); | |
246 | val &= ~(0x03 << 4); | |
247 | val |= (info->core_chipsel << 4) | BIT(12); | |
248 | davinci_nand_writel(info, NANDFCR_OFFSET, val); | |
249 | ||
250 | info->is_readmode = (mode == NAND_ECC_READ); | |
251 | ||
252 | spin_unlock_irqrestore(&davinci_nand_lock, flags); | |
253 | } | |
254 | ||
255 | /* Read raw ECC code after writing to NAND. */ | |
256 | static void | |
257 | nand_davinci_readecc_4bit(struct davinci_nand_info *info, u32 code[4]) | |
258 | { | |
259 | const u32 mask = 0x03ff03ff; | |
260 | ||
261 | code[0] = davinci_nand_readl(info, NAND_4BIT_ECC1_OFFSET) & mask; | |
262 | code[1] = davinci_nand_readl(info, NAND_4BIT_ECC2_OFFSET) & mask; | |
263 | code[2] = davinci_nand_readl(info, NAND_4BIT_ECC3_OFFSET) & mask; | |
264 | code[3] = davinci_nand_readl(info, NAND_4BIT_ECC4_OFFSET) & mask; | |
265 | } | |
266 | ||
267 | /* Terminate read ECC; or return ECC (as bytes) of data written to NAND. */ | |
268 | static int nand_davinci_calculate_4bit(struct mtd_info *mtd, | |
269 | const u_char *dat, u_char *ecc_code) | |
270 | { | |
271 | struct davinci_nand_info *info = to_davinci_nand(mtd); | |
272 | u32 raw_ecc[4], *p; | |
273 | unsigned i; | |
274 | ||
275 | /* After a read, terminate ECC calculation by a dummy read | |
276 | * of some 4-bit ECC register. ECC covers everything that | |
277 | * was read; correct() just uses the hardware state, so | |
278 | * ecc_code is not needed. | |
279 | */ | |
280 | if (info->is_readmode) { | |
281 | davinci_nand_readl(info, NAND_4BIT_ECC1_OFFSET); | |
282 | return 0; | |
283 | } | |
284 | ||
285 | /* Pack eight raw 10-bit ecc values into ten bytes, making | |
286 | * two passes which each convert four values (in upper and | |
287 | * lower halves of two 32-bit words) into five bytes. The | |
288 | * ROM boot loader uses this same packing scheme. | |
289 | */ | |
290 | nand_davinci_readecc_4bit(info, raw_ecc); | |
291 | for (i = 0, p = raw_ecc; i < 2; i++, p += 2) { | |
292 | *ecc_code++ = p[0] & 0xff; | |
293 | *ecc_code++ = ((p[0] >> 8) & 0x03) | ((p[0] >> 14) & 0xfc); | |
294 | *ecc_code++ = ((p[0] >> 22) & 0x0f) | ((p[1] << 4) & 0xf0); | |
295 | *ecc_code++ = ((p[1] >> 4) & 0x3f) | ((p[1] >> 10) & 0xc0); | |
296 | *ecc_code++ = (p[1] >> 18) & 0xff; | |
297 | } | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | /* Correct up to 4 bits in data we just read, using state left in the | |
303 | * hardware plus the ecc_code computed when it was first written. | |
304 | */ | |
305 | static int nand_davinci_correct_4bit(struct mtd_info *mtd, | |
306 | u_char *data, u_char *ecc_code, u_char *null) | |
307 | { | |
308 | int i; | |
309 | struct davinci_nand_info *info = to_davinci_nand(mtd); | |
310 | unsigned short ecc10[8]; | |
311 | unsigned short *ecc16; | |
312 | u32 syndrome[4]; | |
1c3275b6 | 313 | u32 ecc_state; |
6a4123e5 | 314 | unsigned num_errors, corrected; |
2bdb053a | 315 | unsigned long timeo; |
6a4123e5 DB |
316 | |
317 | /* All bytes 0xff? It's an erased page; ignore its ECC. */ | |
318 | for (i = 0; i < 10; i++) { | |
319 | if (ecc_code[i] != 0xff) | |
320 | goto compare; | |
321 | } | |
322 | return 0; | |
323 | ||
324 | compare: | |
325 | /* Unpack ten bytes into eight 10 bit values. We know we're | |
326 | * little-endian, and use type punning for less shifting/masking. | |
327 | */ | |
328 | if (WARN_ON(0x01 & (unsigned) ecc_code)) | |
329 | return -EINVAL; | |
330 | ecc16 = (unsigned short *)ecc_code; | |
331 | ||
332 | ecc10[0] = (ecc16[0] >> 0) & 0x3ff; | |
333 | ecc10[1] = ((ecc16[0] >> 10) & 0x3f) | ((ecc16[1] << 6) & 0x3c0); | |
334 | ecc10[2] = (ecc16[1] >> 4) & 0x3ff; | |
335 | ecc10[3] = ((ecc16[1] >> 14) & 0x3) | ((ecc16[2] << 2) & 0x3fc); | |
336 | ecc10[4] = (ecc16[2] >> 8) | ((ecc16[3] << 8) & 0x300); | |
337 | ecc10[5] = (ecc16[3] >> 2) & 0x3ff; | |
338 | ecc10[6] = ((ecc16[3] >> 12) & 0xf) | ((ecc16[4] << 4) & 0x3f0); | |
339 | ecc10[7] = (ecc16[4] >> 6) & 0x3ff; | |
340 | ||
341 | /* Tell ECC controller about the expected ECC codes. */ | |
342 | for (i = 7; i >= 0; i--) | |
343 | davinci_nand_writel(info, NAND_4BIT_ECC_LOAD_OFFSET, ecc10[i]); | |
344 | ||
345 | /* Allow time for syndrome calculation ... then read it. | |
346 | * A syndrome of all zeroes 0 means no detected errors. | |
347 | */ | |
348 | davinci_nand_readl(info, NANDFSR_OFFSET); | |
349 | nand_davinci_readecc_4bit(info, syndrome); | |
350 | if (!(syndrome[0] | syndrome[1] | syndrome[2] | syndrome[3])) | |
351 | return 0; | |
352 | ||
f12a9473 SN |
353 | /* |
354 | * Clear any previous address calculation by doing a dummy read of an | |
355 | * error address register. | |
356 | */ | |
357 | davinci_nand_readl(info, NAND_ERR_ADD1_OFFSET); | |
358 | ||
6a4123e5 DB |
359 | /* Start address calculation, and wait for it to complete. |
360 | * We _could_ start reading more data while this is working, | |
361 | * to speed up the overall page read. | |
362 | */ | |
363 | davinci_nand_writel(info, NANDFCR_OFFSET, | |
364 | davinci_nand_readl(info, NANDFCR_OFFSET) | BIT(13)); | |
1c3275b6 SR |
365 | |
366 | /* | |
367 | * ECC_STATE field reads 0x3 (Error correction complete) immediately | |
368 | * after setting the 4BITECC_ADD_CALC_START bit. So if you immediately | |
369 | * begin trying to poll for the state, you may fall right out of your | |
370 | * loop without any of the correction calculations having taken place. | |
eea116ed WS |
371 | * The recommendation from the hardware team is to initially delay as |
372 | * long as ECC_STATE reads less than 4. After that, ECC HW has entered | |
373 | * correction state. | |
1c3275b6 | 374 | */ |
2bdb053a | 375 | timeo = jiffies + usecs_to_jiffies(100); |
1c3275b6 SR |
376 | do { |
377 | ecc_state = (davinci_nand_readl(info, | |
378 | NANDFSR_OFFSET) >> 8) & 0x0f; | |
379 | cpu_relax(); | |
380 | } while ((ecc_state < 4) && time_before(jiffies, timeo)); | |
381 | ||
6a4123e5 DB |
382 | for (;;) { |
383 | u32 fsr = davinci_nand_readl(info, NANDFSR_OFFSET); | |
384 | ||
385 | switch ((fsr >> 8) & 0x0f) { | |
386 | case 0: /* no error, should not happen */ | |
f12a9473 | 387 | davinci_nand_readl(info, NAND_ERR_ERRVAL1_OFFSET); |
6a4123e5 DB |
388 | return 0; |
389 | case 1: /* five or more errors detected */ | |
f12a9473 | 390 | davinci_nand_readl(info, NAND_ERR_ERRVAL1_OFFSET); |
6a4123e5 DB |
391 | return -EIO; |
392 | case 2: /* error addresses computed */ | |
393 | case 3: | |
394 | num_errors = 1 + ((fsr >> 16) & 0x03); | |
395 | goto correct; | |
396 | default: /* still working on it */ | |
397 | cpu_relax(); | |
398 | continue; | |
399 | } | |
400 | } | |
401 | ||
402 | correct: | |
403 | /* correct each error */ | |
404 | for (i = 0, corrected = 0; i < num_errors; i++) { | |
405 | int error_address, error_value; | |
406 | ||
407 | if (i > 1) { | |
408 | error_address = davinci_nand_readl(info, | |
409 | NAND_ERR_ADD2_OFFSET); | |
410 | error_value = davinci_nand_readl(info, | |
411 | NAND_ERR_ERRVAL2_OFFSET); | |
412 | } else { | |
413 | error_address = davinci_nand_readl(info, | |
414 | NAND_ERR_ADD1_OFFSET); | |
415 | error_value = davinci_nand_readl(info, | |
416 | NAND_ERR_ERRVAL1_OFFSET); | |
417 | } | |
418 | ||
419 | if (i & 1) { | |
420 | error_address >>= 16; | |
421 | error_value >>= 16; | |
422 | } | |
423 | error_address &= 0x3ff; | |
424 | error_address = (512 + 7) - error_address; | |
425 | ||
426 | if (error_address < 512) { | |
427 | data[error_address] ^= error_value; | |
428 | corrected++; | |
429 | } | |
430 | } | |
431 | ||
432 | return corrected; | |
433 | } | |
434 | ||
435 | /*----------------------------------------------------------------------*/ | |
436 | ||
ff4569c7 DB |
437 | /* |
438 | * NOTE: NAND boot requires ALE == EM_A[1], CLE == EM_A[2], so that's | |
439 | * how these chips are normally wired. This translates to both 8 and 16 | |
440 | * bit busses using ALE == BIT(3) in byte addresses, and CLE == BIT(4). | |
441 | * | |
442 | * For now we assume that configuration, or any other one which ignores | |
443 | * the two LSBs for NAND access ... so we can issue 32-bit reads/writes | |
444 | * and have that transparently morphed into multiple NAND operations. | |
445 | */ | |
446 | static void nand_davinci_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) | |
447 | { | |
448 | struct nand_chip *chip = mtd->priv; | |
449 | ||
450 | if ((0x03 & ((unsigned)buf)) == 0 && (0x03 & len) == 0) | |
451 | ioread32_rep(chip->IO_ADDR_R, buf, len >> 2); | |
452 | else if ((0x01 & ((unsigned)buf)) == 0 && (0x01 & len) == 0) | |
453 | ioread16_rep(chip->IO_ADDR_R, buf, len >> 1); | |
454 | else | |
455 | ioread8_rep(chip->IO_ADDR_R, buf, len); | |
456 | } | |
457 | ||
458 | static void nand_davinci_write_buf(struct mtd_info *mtd, | |
459 | const uint8_t *buf, int len) | |
460 | { | |
461 | struct nand_chip *chip = mtd->priv; | |
462 | ||
463 | if ((0x03 & ((unsigned)buf)) == 0 && (0x03 & len) == 0) | |
464 | iowrite32_rep(chip->IO_ADDR_R, buf, len >> 2); | |
465 | else if ((0x01 & ((unsigned)buf)) == 0 && (0x01 & len) == 0) | |
466 | iowrite16_rep(chip->IO_ADDR_R, buf, len >> 1); | |
467 | else | |
468 | iowrite8_rep(chip->IO_ADDR_R, buf, len); | |
469 | } | |
470 | ||
471 | /* | |
472 | * Check hardware register for wait status. Returns 1 if device is ready, | |
473 | * 0 if it is still busy. | |
474 | */ | |
475 | static int nand_davinci_dev_ready(struct mtd_info *mtd) | |
476 | { | |
477 | struct davinci_nand_info *info = to_davinci_nand(mtd); | |
478 | ||
479 | return davinci_nand_readl(info, NANDFSR_OFFSET) & BIT(0); | |
480 | } | |
481 | ||
ff4569c7 DB |
482 | /*----------------------------------------------------------------------*/ |
483 | ||
6a4123e5 DB |
484 | /* An ECC layout for using 4-bit ECC with small-page flash, storing |
485 | * ten ECC bytes plus the manufacturer's bad block marker byte, and | |
486 | * and not overlapping the default BBT markers. | |
487 | */ | |
488 | static struct nand_ecclayout hwecc4_small __initconst = { | |
489 | .eccbytes = 10, | |
490 | .eccpos = { 0, 1, 2, 3, 4, | |
491 | /* offset 5 holds the badblock marker */ | |
492 | 6, 7, | |
493 | 13, 14, 15, }, | |
494 | .oobfree = { | |
495 | {.offset = 8, .length = 5, }, | |
496 | {.offset = 16, }, | |
497 | }, | |
498 | }; | |
499 | ||
f12a9473 SN |
500 | /* An ECC layout for using 4-bit ECC with large-page (2048bytes) flash, |
501 | * storing ten ECC bytes plus the manufacturer's bad block marker byte, | |
502 | * and not overlapping the default BBT markers. | |
503 | */ | |
504 | static struct nand_ecclayout hwecc4_2048 __initconst = { | |
505 | .eccbytes = 40, | |
506 | .eccpos = { | |
507 | /* at the end of spare sector */ | |
508 | 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, | |
509 | 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, | |
510 | 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, | |
511 | 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, | |
512 | }, | |
513 | .oobfree = { | |
514 | /* 2 bytes at offset 0 hold manufacturer badblock markers */ | |
515 | {.offset = 2, .length = 22, }, | |
516 | /* 5 bytes at offset 8 hold BBT markers */ | |
517 | /* 8 bytes at offset 16 hold JFFS2 clean markers */ | |
518 | }, | |
519 | }; | |
6a4123e5 | 520 | |
ff4569c7 DB |
521 | static int __init nand_davinci_probe(struct platform_device *pdev) |
522 | { | |
523 | struct davinci_nand_pdata *pdata = pdev->dev.platform_data; | |
524 | struct davinci_nand_info *info; | |
525 | struct resource *res1; | |
526 | struct resource *res2; | |
527 | void __iomem *vaddr; | |
528 | void __iomem *base; | |
529 | int ret; | |
530 | uint32_t val; | |
531 | nand_ecc_modes_t ecc_mode; | |
532 | ||
533a0149 DB |
533 | /* insist on board-specific configuration */ |
534 | if (!pdata) | |
535 | return -ENODEV; | |
536 | ||
ff4569c7 DB |
537 | /* which external chipselect will we be managing? */ |
538 | if (pdev->id < 0 || pdev->id > 3) | |
539 | return -ENODEV; | |
540 | ||
541 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
542 | if (!info) { | |
543 | dev_err(&pdev->dev, "unable to allocate memory\n"); | |
544 | ret = -ENOMEM; | |
545 | goto err_nomem; | |
546 | } | |
547 | ||
548 | platform_set_drvdata(pdev, info); | |
549 | ||
550 | res1 = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
551 | res2 = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
552 | if (!res1 || !res2) { | |
553 | dev_err(&pdev->dev, "resource missing\n"); | |
554 | ret = -EINVAL; | |
555 | goto err_nomem; | |
556 | } | |
557 | ||
d8bc5555 HS |
558 | vaddr = ioremap(res1->start, resource_size(res1)); |
559 | base = ioremap(res2->start, resource_size(res2)); | |
ff4569c7 DB |
560 | if (!vaddr || !base) { |
561 | dev_err(&pdev->dev, "ioremap failed\n"); | |
562 | ret = -EINVAL; | |
563 | goto err_ioremap; | |
564 | } | |
565 | ||
566 | info->dev = &pdev->dev; | |
567 | info->base = base; | |
568 | info->vaddr = vaddr; | |
569 | ||
570 | info->mtd.priv = &info->chip; | |
571 | info->mtd.name = dev_name(&pdev->dev); | |
572 | info->mtd.owner = THIS_MODULE; | |
573 | ||
87f39f04 DB |
574 | info->mtd.dev.parent = &pdev->dev; |
575 | ||
ff4569c7 DB |
576 | info->chip.IO_ADDR_R = vaddr; |
577 | info->chip.IO_ADDR_W = vaddr; | |
578 | info->chip.chip_delay = 0; | |
579 | info->chip.select_chip = nand_davinci_select_chip; | |
580 | ||
bb9ebd4e | 581 | /* options such as NAND_BBT_USE_FLASH */ |
a40f7341 BN |
582 | info->chip.bbt_options = pdata->bbt_options; |
583 | /* options such as 16-bit widths */ | |
533a0149 | 584 | info->chip.options = pdata->options; |
f611a79f MG |
585 | info->chip.bbt_td = pdata->bbt_td; |
586 | info->chip.bbt_md = pdata->bbt_md; | |
a88dbc5b | 587 | info->timing = pdata->timing; |
ff4569c7 DB |
588 | |
589 | info->ioaddr = (uint32_t __force) vaddr; | |
590 | ||
591 | info->current_cs = info->ioaddr; | |
592 | info->core_chipsel = pdev->id; | |
593 | info->mask_chipsel = pdata->mask_chipsel; | |
594 | ||
595 | /* use nandboot-capable ALE/CLE masks by default */ | |
5cd0be8e | 596 | info->mask_ale = pdata->mask_ale ? : MASK_ALE; |
533a0149 | 597 | info->mask_cle = pdata->mask_cle ? : MASK_CLE; |
ff4569c7 DB |
598 | |
599 | /* Set address of hardware control function */ | |
600 | info->chip.cmd_ctrl = nand_davinci_hwcontrol; | |
601 | info->chip.dev_ready = nand_davinci_dev_ready; | |
602 | ||
603 | /* Speed up buffer I/O */ | |
604 | info->chip.read_buf = nand_davinci_read_buf; | |
605 | info->chip.write_buf = nand_davinci_write_buf; | |
606 | ||
533a0149 DB |
607 | /* Use board-specific ECC config */ |
608 | ecc_mode = pdata->ecc_mode; | |
ff4569c7 | 609 | |
6a4123e5 | 610 | ret = -EINVAL; |
ff4569c7 DB |
611 | switch (ecc_mode) { |
612 | case NAND_ECC_NONE: | |
613 | case NAND_ECC_SOFT: | |
6a4123e5 | 614 | pdata->ecc_bits = 0; |
ff4569c7 DB |
615 | break; |
616 | case NAND_ECC_HW: | |
6a4123e5 DB |
617 | if (pdata->ecc_bits == 4) { |
618 | /* No sanity checks: CPUs must support this, | |
619 | * and the chips may not use NAND_BUSWIDTH_16. | |
620 | */ | |
621 | ||
622 | /* No sharing 4-bit hardware between chipselects yet */ | |
623 | spin_lock_irq(&davinci_nand_lock); | |
624 | if (ecc4_busy) | |
625 | ret = -EBUSY; | |
626 | else | |
627 | ecc4_busy = true; | |
628 | spin_unlock_irq(&davinci_nand_lock); | |
629 | ||
630 | if (ret == -EBUSY) | |
631 | goto err_ecc; | |
632 | ||
633 | info->chip.ecc.calculate = nand_davinci_calculate_4bit; | |
634 | info->chip.ecc.correct = nand_davinci_correct_4bit; | |
635 | info->chip.ecc.hwctl = nand_davinci_hwctl_4bit; | |
636 | info->chip.ecc.bytes = 10; | |
637 | } else { | |
638 | info->chip.ecc.calculate = nand_davinci_calculate_1bit; | |
639 | info->chip.ecc.correct = nand_davinci_correct_1bit; | |
640 | info->chip.ecc.hwctl = nand_davinci_hwctl_1bit; | |
641 | info->chip.ecc.bytes = 3; | |
642 | } | |
ff4569c7 | 643 | info->chip.ecc.size = 512; |
6a918bad | 644 | info->chip.ecc.strength = pdata->ecc_bits; |
ff4569c7 | 645 | break; |
ff4569c7 DB |
646 | default: |
647 | ret = -EINVAL; | |
648 | goto err_ecc; | |
649 | } | |
650 | info->chip.ecc.mode = ecc_mode; | |
651 | ||
cd24f8c1 | 652 | info->clk = clk_get(&pdev->dev, "aemif"); |
ff4569c7 DB |
653 | if (IS_ERR(info->clk)) { |
654 | ret = PTR_ERR(info->clk); | |
cd24f8c1 | 655 | dev_dbg(&pdev->dev, "unable to get AEMIF clock, err %d\n", ret); |
ff4569c7 DB |
656 | goto err_clk; |
657 | } | |
658 | ||
659 | ret = clk_enable(info->clk); | |
660 | if (ret < 0) { | |
cd24f8c1 KH |
661 | dev_dbg(&pdev->dev, "unable to enable AEMIF clock, err %d\n", |
662 | ret); | |
ff4569c7 DB |
663 | goto err_clk_enable; |
664 | } | |
665 | ||
a88dbc5b SN |
666 | /* |
667 | * Setup Async configuration register in case we did not boot from | |
668 | * NAND and so bootloader did not bother to set it up. | |
ff4569c7 | 669 | */ |
a88dbc5b SN |
670 | val = davinci_nand_readl(info, A1CR_OFFSET + info->core_chipsel * 4); |
671 | ||
672 | /* Extended Wait is not valid and Select Strobe mode is not used */ | |
673 | val &= ~(ACR_ASIZE_MASK | ACR_EW_MASK | ACR_SS_MASK); | |
674 | if (info->chip.options & NAND_BUSWIDTH_16) | |
675 | val |= 0x1; | |
676 | ||
677 | davinci_nand_writel(info, A1CR_OFFSET + info->core_chipsel * 4, val); | |
678 | ||
47882d78 HS |
679 | ret = 0; |
680 | if (info->timing) | |
681 | ret = davinci_aemif_setup_timing(info->timing, info->base, | |
a88dbc5b SN |
682 | info->core_chipsel); |
683 | if (ret < 0) { | |
684 | dev_dbg(&pdev->dev, "NAND timing values setup fail\n"); | |
685 | goto err_timing; | |
686 | } | |
ff4569c7 DB |
687 | |
688 | spin_lock_irq(&davinci_nand_lock); | |
689 | ||
690 | /* put CSxNAND into NAND mode */ | |
691 | val = davinci_nand_readl(info, NANDFCR_OFFSET); | |
692 | val |= BIT(info->core_chipsel); | |
693 | davinci_nand_writel(info, NANDFCR_OFFSET, val); | |
694 | ||
695 | spin_unlock_irq(&davinci_nand_lock); | |
696 | ||
697 | /* Scan to find existence of the device(s) */ | |
5e81e88a | 698 | ret = nand_scan_ident(&info->mtd, pdata->mask_chipsel ? 2 : 1, NULL); |
ff4569c7 DB |
699 | if (ret < 0) { |
700 | dev_dbg(&pdev->dev, "no NAND chip(s) found\n"); | |
701 | goto err_scan; | |
702 | } | |
703 | ||
6a4123e5 DB |
704 | /* Update ECC layout if needed ... for 1-bit HW ECC, the default |
705 | * is OK, but it allocates 6 bytes when only 3 are needed (for | |
706 | * each 512 bytes). For the 4-bit HW ECC, that default is not | |
707 | * usable: 10 bytes are needed, not 6. | |
708 | */ | |
709 | if (pdata->ecc_bits == 4) { | |
710 | int chunks = info->mtd.writesize / 512; | |
711 | ||
712 | if (!chunks || info->mtd.oobsize < 16) { | |
713 | dev_dbg(&pdev->dev, "too small\n"); | |
714 | ret = -EINVAL; | |
715 | goto err_scan; | |
716 | } | |
717 | ||
718 | /* For small page chips, preserve the manufacturer's | |
719 | * badblock marking data ... and make sure a flash BBT | |
720 | * table marker fits in the free bytes. | |
721 | */ | |
722 | if (chunks == 1) { | |
723 | info->ecclayout = hwecc4_small; | |
724 | info->ecclayout.oobfree[1].length = | |
725 | info->mtd.oobsize - 16; | |
726 | goto syndrome_done; | |
727 | } | |
f12a9473 SN |
728 | if (chunks == 4) { |
729 | info->ecclayout = hwecc4_2048; | |
730 | info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST; | |
731 | goto syndrome_done; | |
732 | } | |
6a4123e5 | 733 | |
f12a9473 SN |
734 | /* 4KiB page chips are not yet supported. The eccpos from |
735 | * nand_ecclayout cannot hold 80 bytes and change to eccpos[] | |
736 | * breaks userspace ioctl interface with mtd-utils. Once we | |
737 | * resolve this issue, NAND_ECC_HW_OOB_FIRST mode can be used | |
738 | * for the 4KiB page chips. | |
cc26c3cd BN |
739 | * |
740 | * TODO: Note that nand_ecclayout has now been expanded and can | |
741 | * hold plenty of OOB entries. | |
6a4123e5 DB |
742 | */ |
743 | dev_warn(&pdev->dev, "no 4-bit ECC support yet " | |
f12a9473 | 744 | "for 4KiB-page NAND\n"); |
6a4123e5 DB |
745 | ret = -EIO; |
746 | goto err_scan; | |
747 | ||
748 | syndrome_done: | |
749 | info->chip.ecc.layout = &info->ecclayout; | |
750 | } | |
751 | ||
752 | ret = nand_scan_tail(&info->mtd); | |
753 | if (ret < 0) | |
754 | goto err_scan; | |
755 | ||
42d7fbe2 AB |
756 | ret = mtd_device_parse_register(&info->mtd, NULL, NULL, pdata->parts, |
757 | pdata->nr_parts); | |
ff4569c7 DB |
758 | |
759 | if (ret < 0) | |
760 | goto err_scan; | |
761 | ||
762 | val = davinci_nand_readl(info, NRCSR_OFFSET); | |
763 | dev_info(&pdev->dev, "controller rev. %d.%d\n", | |
764 | (val >> 8) & 0xff, val & 0xff); | |
765 | ||
766 | return 0; | |
767 | ||
768 | err_scan: | |
a88dbc5b | 769 | err_timing: |
ff4569c7 DB |
770 | clk_disable(info->clk); |
771 | ||
772 | err_clk_enable: | |
773 | clk_put(info->clk); | |
774 | ||
6a4123e5 DB |
775 | spin_lock_irq(&davinci_nand_lock); |
776 | if (ecc_mode == NAND_ECC_HW_SYNDROME) | |
777 | ecc4_busy = false; | |
778 | spin_unlock_irq(&davinci_nand_lock); | |
779 | ||
ff4569c7 DB |
780 | err_ecc: |
781 | err_clk: | |
782 | err_ioremap: | |
783 | if (base) | |
784 | iounmap(base); | |
785 | if (vaddr) | |
786 | iounmap(vaddr); | |
787 | ||
788 | err_nomem: | |
789 | kfree(info); | |
790 | return ret; | |
791 | } | |
792 | ||
793 | static int __exit nand_davinci_remove(struct platform_device *pdev) | |
794 | { | |
795 | struct davinci_nand_info *info = platform_get_drvdata(pdev); | |
ff4569c7 | 796 | |
6a4123e5 DB |
797 | spin_lock_irq(&davinci_nand_lock); |
798 | if (info->chip.ecc.mode == NAND_ECC_HW_SYNDROME) | |
799 | ecc4_busy = false; | |
800 | spin_unlock_irq(&davinci_nand_lock); | |
801 | ||
ff4569c7 DB |
802 | iounmap(info->base); |
803 | iounmap(info->vaddr); | |
804 | ||
805 | nand_release(&info->mtd); | |
806 | ||
807 | clk_disable(info->clk); | |
808 | clk_put(info->clk); | |
809 | ||
810 | kfree(info); | |
811 | ||
812 | return 0; | |
813 | } | |
814 | ||
815 | static struct platform_driver nand_davinci_driver = { | |
816 | .remove = __exit_p(nand_davinci_remove), | |
817 | .driver = { | |
818 | .name = "davinci_nand", | |
819 | }, | |
820 | }; | |
821 | MODULE_ALIAS("platform:davinci_nand"); | |
822 | ||
823 | static int __init nand_davinci_init(void) | |
824 | { | |
825 | return platform_driver_probe(&nand_davinci_driver, nand_davinci_probe); | |
826 | } | |
827 | module_init(nand_davinci_init); | |
828 | ||
829 | static void __exit nand_davinci_exit(void) | |
830 | { | |
831 | platform_driver_unregister(&nand_davinci_driver); | |
832 | } | |
833 | module_exit(nand_davinci_exit); | |
834 | ||
835 | MODULE_LICENSE("GPL"); | |
836 | MODULE_AUTHOR("Texas Instruments"); | |
837 | MODULE_DESCRIPTION("Davinci NAND flash driver"); | |
838 |