Commit | Line | Data |
---|---|---|
42cb1403 | 1 | /* |
1c7b874d | 2 | * Copyright © 2003 Rick Bronson |
42cb1403 AV |
3 | * |
4 | * Derived from drivers/mtd/nand/autcpu12.c | |
1c7b874d | 5 | * Copyright © 2001 Thomas Gleixner (gleixner@autronix.de) |
42cb1403 AV |
6 | * |
7 | * Derived from drivers/mtd/spia.c | |
1c7b874d | 8 | * Copyright © 2000 Steven J. Hill (sjhill@cotw.com) |
42cb1403 | 9 | * |
77f5492c RG |
10 | * |
11 | * Add Hardware ECC support for AT91SAM9260 / AT91SAM9263 | |
1c7b874d | 12 | * Richard Genoud (richard.genoud@gmail.com), Adeneo Copyright © 2007 |
77f5492c RG |
13 | * |
14 | * Derived from Das U-Boot source code | |
15 | * (u-boot-1.1.5/board/atmel/at91sam9263ek/nand.c) | |
1c7b874d | 16 | * © Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas |
77f5492c | 17 | * |
1c7b874d JW |
18 | * Add Programmable Multibit ECC support for various AT91 SoC |
19 | * © Copyright 2012 ATMEL, Hong Xu | |
77f5492c | 20 | * |
42cb1403 AV |
21 | * This program is free software; you can redistribute it and/or modify |
22 | * it under the terms of the GNU General Public License version 2 as | |
23 | * published by the Free Software Foundation. | |
24 | * | |
25 | */ | |
26 | ||
b7f080cf | 27 | #include <linux/dma-mapping.h> |
42cb1403 AV |
28 | #include <linux/slab.h> |
29 | #include <linux/module.h> | |
f4fa697c | 30 | #include <linux/moduleparam.h> |
42cb1403 | 31 | #include <linux/platform_device.h> |
d6a01661 JCPV |
32 | #include <linux/of.h> |
33 | #include <linux/of_device.h> | |
34 | #include <linux/of_gpio.h> | |
35 | #include <linux/of_mtd.h> | |
42cb1403 AV |
36 | #include <linux/mtd/mtd.h> |
37 | #include <linux/mtd/nand.h> | |
38 | #include <linux/mtd/partitions.h> | |
39 | ||
5c39c4c5 | 40 | #include <linux/dmaengine.h> |
90574d0a DW |
41 | #include <linux/gpio.h> |
42 | #include <linux/io.h> | |
bf4289cb | 43 | #include <linux/platform_data/atmel.h> |
251e783a | 44 | #include <linux/pinctrl/consumer.h> |
42cb1403 | 45 | |
a09e64fb | 46 | #include <mach/cpu.h> |
42cb1403 | 47 | |
cbc6c5e7 HX |
48 | static int use_dma = 1; |
49 | module_param(use_dma, int, 0); | |
50 | ||
f4fa697c SP |
51 | static int on_flash_bbt = 0; |
52 | module_param(on_flash_bbt, int, 0); | |
53 | ||
77f5492c RG |
54 | /* Register access macros */ |
55 | #define ecc_readl(add, reg) \ | |
3c3796cc | 56 | __raw_readl(add + ATMEL_ECC_##reg) |
77f5492c | 57 | #define ecc_writel(add, reg, value) \ |
3c3796cc | 58 | __raw_writel((value), add + ATMEL_ECC_##reg) |
77f5492c | 59 | |
d4f4c0aa | 60 | #include "atmel_nand_ecc.h" /* Hardware ECC registers */ |
77f5492c RG |
61 | |
62 | /* oob layout for large page size | |
63 | * bad block info is on bytes 0 and 1 | |
64 | * the bytes have to be consecutives to avoid | |
65 | * several NAND_CMD_RNDOUT during read | |
66 | */ | |
3c3796cc | 67 | static struct nand_ecclayout atmel_oobinfo_large = { |
77f5492c RG |
68 | .eccbytes = 4, |
69 | .eccpos = {60, 61, 62, 63}, | |
70 | .oobfree = { | |
71 | {2, 58} | |
72 | }, | |
73 | }; | |
74 | ||
75 | /* oob layout for small page size | |
76 | * bad block info is on bytes 4 and 5 | |
77 | * the bytes have to be consecutives to avoid | |
78 | * several NAND_CMD_RNDOUT during read | |
79 | */ | |
3c3796cc | 80 | static struct nand_ecclayout atmel_oobinfo_small = { |
77f5492c RG |
81 | .eccbytes = 4, |
82 | .eccpos = {0, 1, 2, 3}, | |
83 | .oobfree = { | |
84 | {6, 10} | |
85 | }, | |
86 | }; | |
87 | ||
3c3796cc | 88 | struct atmel_nand_host { |
42cb1403 AV |
89 | struct nand_chip nand_chip; |
90 | struct mtd_info mtd; | |
91 | void __iomem *io_base; | |
cbc6c5e7 | 92 | dma_addr_t io_phys; |
d6a01661 | 93 | struct atmel_nand_data board; |
77f5492c RG |
94 | struct device *dev; |
95 | void __iomem *ecc; | |
cbc6c5e7 HX |
96 | |
97 | struct completion comp; | |
98 | struct dma_chan *dma_chan; | |
a41b51a1 JW |
99 | |
100 | bool has_pmecc; | |
101 | u8 pmecc_corr_cap; | |
102 | u16 pmecc_sector_size; | |
103 | u32 pmecc_lookup_table_offset; | |
1c7b874d JW |
104 | |
105 | int pmecc_bytes_per_sector; | |
106 | int pmecc_sector_number; | |
107 | int pmecc_degree; /* Degree of remainders */ | |
108 | int pmecc_cw_len; /* Length of codeword */ | |
109 | ||
110 | void __iomem *pmerrloc_base; | |
111 | void __iomem *pmecc_rom_base; | |
112 | ||
113 | /* lookup table for alpha_to and index_of */ | |
114 | void __iomem *pmecc_alpha_to; | |
115 | void __iomem *pmecc_index_of; | |
116 | ||
117 | /* data for pmecc computation */ | |
118 | int16_t *pmecc_partial_syn; | |
119 | int16_t *pmecc_si; | |
120 | int16_t *pmecc_smu; /* Sigma table */ | |
121 | int16_t *pmecc_lmu; /* polynomal order */ | |
122 | int *pmecc_mu; | |
123 | int *pmecc_dmu; | |
124 | int *pmecc_delta; | |
42cb1403 AV |
125 | }; |
126 | ||
1c7b874d JW |
127 | static struct nand_ecclayout atmel_pmecc_oobinfo; |
128 | ||
cbc6c5e7 HX |
129 | static int cpu_has_dma(void) |
130 | { | |
131 | return cpu_is_at91sam9rl() || cpu_is_at91sam9g45(); | |
132 | } | |
133 | ||
8136508c AN |
134 | /* |
135 | * Enable NAND. | |
136 | */ | |
3c3796cc | 137 | static void atmel_nand_enable(struct atmel_nand_host *host) |
8136508c | 138 | { |
d6a01661 JCPV |
139 | if (gpio_is_valid(host->board.enable_pin)) |
140 | gpio_set_value(host->board.enable_pin, 0); | |
8136508c AN |
141 | } |
142 | ||
143 | /* | |
144 | * Disable NAND. | |
145 | */ | |
3c3796cc | 146 | static void atmel_nand_disable(struct atmel_nand_host *host) |
8136508c | 147 | { |
d6a01661 JCPV |
148 | if (gpio_is_valid(host->board.enable_pin)) |
149 | gpio_set_value(host->board.enable_pin, 1); | |
8136508c AN |
150 | } |
151 | ||
42cb1403 AV |
152 | /* |
153 | * Hardware specific access to control-lines | |
154 | */ | |
3c3796cc | 155 | static void atmel_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) |
42cb1403 AV |
156 | { |
157 | struct nand_chip *nand_chip = mtd->priv; | |
3c3796cc | 158 | struct atmel_nand_host *host = nand_chip->priv; |
42cb1403 | 159 | |
8136508c | 160 | if (ctrl & NAND_CTRL_CHANGE) { |
2314488e | 161 | if (ctrl & NAND_NCE) |
3c3796cc | 162 | atmel_nand_enable(host); |
2314488e | 163 | else |
3c3796cc | 164 | atmel_nand_disable(host); |
2314488e | 165 | } |
42cb1403 AV |
166 | if (cmd == NAND_CMD_NONE) |
167 | return; | |
168 | ||
169 | if (ctrl & NAND_CLE) | |
d6a01661 | 170 | writeb(cmd, host->io_base + (1 << host->board.cle)); |
42cb1403 | 171 | else |
d6a01661 | 172 | writeb(cmd, host->io_base + (1 << host->board.ale)); |
42cb1403 AV |
173 | } |
174 | ||
175 | /* | |
176 | * Read the Device Ready pin. | |
177 | */ | |
3c3796cc | 178 | static int atmel_nand_device_ready(struct mtd_info *mtd) |
42cb1403 AV |
179 | { |
180 | struct nand_chip *nand_chip = mtd->priv; | |
3c3796cc | 181 | struct atmel_nand_host *host = nand_chip->priv; |
42cb1403 | 182 | |
d6a01661 JCPV |
183 | return gpio_get_value(host->board.rdy_pin) ^ |
184 | !!host->board.rdy_pin_active_low; | |
42cb1403 AV |
185 | } |
186 | ||
50082319 AB |
187 | /* |
188 | * Minimal-overhead PIO for data access. | |
189 | */ | |
190 | static void atmel_read_buf8(struct mtd_info *mtd, u8 *buf, int len) | |
191 | { | |
192 | struct nand_chip *nand_chip = mtd->priv; | |
193 | ||
194 | __raw_readsb(nand_chip->IO_ADDR_R, buf, len); | |
195 | } | |
196 | ||
197 | static void atmel_read_buf16(struct mtd_info *mtd, u8 *buf, int len) | |
198 | { | |
199 | struct nand_chip *nand_chip = mtd->priv; | |
200 | ||
201 | __raw_readsw(nand_chip->IO_ADDR_R, buf, len / 2); | |
202 | } | |
203 | ||
204 | static void atmel_write_buf8(struct mtd_info *mtd, const u8 *buf, int len) | |
205 | { | |
206 | struct nand_chip *nand_chip = mtd->priv; | |
207 | ||
208 | __raw_writesb(nand_chip->IO_ADDR_W, buf, len); | |
209 | } | |
210 | ||
211 | static void atmel_write_buf16(struct mtd_info *mtd, const u8 *buf, int len) | |
212 | { | |
213 | struct nand_chip *nand_chip = mtd->priv; | |
214 | ||
215 | __raw_writesw(nand_chip->IO_ADDR_W, buf, len / 2); | |
216 | } | |
217 | ||
cbc6c5e7 HX |
218 | static void dma_complete_func(void *completion) |
219 | { | |
220 | complete(completion); | |
221 | } | |
222 | ||
223 | static int atmel_nand_dma_op(struct mtd_info *mtd, void *buf, int len, | |
224 | int is_read) | |
225 | { | |
226 | struct dma_device *dma_dev; | |
227 | enum dma_ctrl_flags flags; | |
228 | dma_addr_t dma_src_addr, dma_dst_addr, phys_addr; | |
229 | struct dma_async_tx_descriptor *tx = NULL; | |
230 | dma_cookie_t cookie; | |
231 | struct nand_chip *chip = mtd->priv; | |
232 | struct atmel_nand_host *host = chip->priv; | |
233 | void *p = buf; | |
234 | int err = -EIO; | |
235 | enum dma_data_direction dir = is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
236 | ||
80b4f81a HX |
237 | if (buf >= high_memory) |
238 | goto err_buf; | |
cbc6c5e7 HX |
239 | |
240 | dma_dev = host->dma_chan->device; | |
241 | ||
242 | flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP | | |
243 | DMA_COMPL_SKIP_DEST_UNMAP; | |
244 | ||
245 | phys_addr = dma_map_single(dma_dev->dev, p, len, dir); | |
246 | if (dma_mapping_error(dma_dev->dev, phys_addr)) { | |
247 | dev_err(host->dev, "Failed to dma_map_single\n"); | |
248 | goto err_buf; | |
249 | } | |
250 | ||
251 | if (is_read) { | |
252 | dma_src_addr = host->io_phys; | |
253 | dma_dst_addr = phys_addr; | |
254 | } else { | |
255 | dma_src_addr = phys_addr; | |
256 | dma_dst_addr = host->io_phys; | |
257 | } | |
258 | ||
259 | tx = dma_dev->device_prep_dma_memcpy(host->dma_chan, dma_dst_addr, | |
260 | dma_src_addr, len, flags); | |
261 | if (!tx) { | |
262 | dev_err(host->dev, "Failed to prepare DMA memcpy\n"); | |
263 | goto err_dma; | |
264 | } | |
265 | ||
266 | init_completion(&host->comp); | |
267 | tx->callback = dma_complete_func; | |
268 | tx->callback_param = &host->comp; | |
269 | ||
270 | cookie = tx->tx_submit(tx); | |
271 | if (dma_submit_error(cookie)) { | |
272 | dev_err(host->dev, "Failed to do DMA tx_submit\n"); | |
273 | goto err_dma; | |
274 | } | |
275 | ||
276 | dma_async_issue_pending(host->dma_chan); | |
277 | wait_for_completion(&host->comp); | |
278 | ||
279 | err = 0; | |
280 | ||
281 | err_dma: | |
282 | dma_unmap_single(dma_dev->dev, phys_addr, len, dir); | |
283 | err_buf: | |
284 | if (err != 0) | |
285 | dev_warn(host->dev, "Fall back to CPU I/O\n"); | |
286 | return err; | |
287 | } | |
288 | ||
289 | static void atmel_read_buf(struct mtd_info *mtd, u8 *buf, int len) | |
290 | { | |
291 | struct nand_chip *chip = mtd->priv; | |
50082319 | 292 | struct atmel_nand_host *host = chip->priv; |
cbc6c5e7 | 293 | |
9d51567e NF |
294 | if (use_dma && len > mtd->oobsize) |
295 | /* only use DMA for bigger than oob size: better performances */ | |
cbc6c5e7 HX |
296 | if (atmel_nand_dma_op(mtd, buf, len, 1) == 0) |
297 | return; | |
298 | ||
d6a01661 | 299 | if (host->board.bus_width_16) |
50082319 AB |
300 | atmel_read_buf16(mtd, buf, len); |
301 | else | |
302 | atmel_read_buf8(mtd, buf, len); | |
cbc6c5e7 HX |
303 | } |
304 | ||
305 | static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len) | |
306 | { | |
307 | struct nand_chip *chip = mtd->priv; | |
50082319 | 308 | struct atmel_nand_host *host = chip->priv; |
cbc6c5e7 | 309 | |
9d51567e NF |
310 | if (use_dma && len > mtd->oobsize) |
311 | /* only use DMA for bigger than oob size: better performances */ | |
cbc6c5e7 HX |
312 | if (atmel_nand_dma_op(mtd, (void *)buf, len, 0) == 0) |
313 | return; | |
314 | ||
d6a01661 | 315 | if (host->board.bus_width_16) |
50082319 AB |
316 | atmel_write_buf16(mtd, buf, len); |
317 | else | |
318 | atmel_write_buf8(mtd, buf, len); | |
cbc6c5e7 HX |
319 | } |
320 | ||
1c7b874d JW |
321 | /* |
322 | * Return number of ecc bytes per sector according to sector size and | |
323 | * correction capability | |
324 | * | |
325 | * Following table shows what at91 PMECC supported: | |
326 | * Correction Capability Sector_512_bytes Sector_1024_bytes | |
327 | * ===================== ================ ================= | |
328 | * 2-bits 4-bytes 4-bytes | |
329 | * 4-bits 7-bytes 7-bytes | |
330 | * 8-bits 13-bytes 14-bytes | |
331 | * 12-bits 20-bytes 21-bytes | |
332 | * 24-bits 39-bytes 42-bytes | |
333 | */ | |
06f25510 | 334 | static int pmecc_get_ecc_bytes(int cap, int sector_size) |
1c7b874d JW |
335 | { |
336 | int m = 12 + sector_size / 512; | |
337 | return (m * cap + 7) / 8; | |
338 | } | |
339 | ||
06f25510 | 340 | static void pmecc_config_ecc_layout(struct nand_ecclayout *layout, |
d8929942 | 341 | int oobsize, int ecc_len) |
1c7b874d JW |
342 | { |
343 | int i; | |
344 | ||
345 | layout->eccbytes = ecc_len; | |
346 | ||
347 | /* ECC will occupy the last ecc_len bytes continuously */ | |
348 | for (i = 0; i < ecc_len; i++) | |
349 | layout->eccpos[i] = oobsize - ecc_len + i; | |
350 | ||
351 | layout->oobfree[0].offset = 2; | |
352 | layout->oobfree[0].length = | |
353 | oobsize - ecc_len - layout->oobfree[0].offset; | |
354 | } | |
355 | ||
06f25510 | 356 | static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host) |
1c7b874d JW |
357 | { |
358 | int table_size; | |
359 | ||
360 | table_size = host->pmecc_sector_size == 512 ? | |
361 | PMECC_LOOKUP_TABLE_SIZE_512 : PMECC_LOOKUP_TABLE_SIZE_1024; | |
362 | ||
363 | return host->pmecc_rom_base + host->pmecc_lookup_table_offset + | |
364 | table_size * sizeof(int16_t); | |
365 | } | |
366 | ||
367 | static void pmecc_data_free(struct atmel_nand_host *host) | |
368 | { | |
369 | kfree(host->pmecc_partial_syn); | |
370 | kfree(host->pmecc_si); | |
371 | kfree(host->pmecc_lmu); | |
372 | kfree(host->pmecc_smu); | |
373 | kfree(host->pmecc_mu); | |
374 | kfree(host->pmecc_dmu); | |
375 | kfree(host->pmecc_delta); | |
376 | } | |
377 | ||
06f25510 | 378 | static int pmecc_data_alloc(struct atmel_nand_host *host) |
1c7b874d JW |
379 | { |
380 | const int cap = host->pmecc_corr_cap; | |
381 | ||
382 | host->pmecc_partial_syn = kzalloc((2 * cap + 1) * sizeof(int16_t), | |
383 | GFP_KERNEL); | |
384 | host->pmecc_si = kzalloc((2 * cap + 1) * sizeof(int16_t), GFP_KERNEL); | |
385 | host->pmecc_lmu = kzalloc((cap + 1) * sizeof(int16_t), GFP_KERNEL); | |
386 | host->pmecc_smu = kzalloc((cap + 2) * (2 * cap + 1) * sizeof(int16_t), | |
387 | GFP_KERNEL); | |
388 | host->pmecc_mu = kzalloc((cap + 1) * sizeof(int), GFP_KERNEL); | |
389 | host->pmecc_dmu = kzalloc((cap + 1) * sizeof(int), GFP_KERNEL); | |
390 | host->pmecc_delta = kzalloc((cap + 1) * sizeof(int), GFP_KERNEL); | |
391 | ||
392 | if (host->pmecc_partial_syn && | |
393 | host->pmecc_si && | |
394 | host->pmecc_lmu && | |
395 | host->pmecc_smu && | |
396 | host->pmecc_mu && | |
397 | host->pmecc_dmu && | |
398 | host->pmecc_delta) | |
399 | return 0; | |
400 | ||
401 | /* error happened */ | |
402 | pmecc_data_free(host); | |
403 | return -ENOMEM; | |
404 | } | |
405 | ||
406 | static void pmecc_gen_syndrome(struct mtd_info *mtd, int sector) | |
407 | { | |
408 | struct nand_chip *nand_chip = mtd->priv; | |
409 | struct atmel_nand_host *host = nand_chip->priv; | |
410 | int i; | |
411 | uint32_t value; | |
412 | ||
413 | /* Fill odd syndromes */ | |
414 | for (i = 0; i < host->pmecc_corr_cap; i++) { | |
415 | value = pmecc_readl_rem_relaxed(host->ecc, sector, i / 2); | |
416 | if (i & 1) | |
417 | value >>= 16; | |
418 | value &= 0xffff; | |
419 | host->pmecc_partial_syn[(2 * i) + 1] = (int16_t)value; | |
420 | } | |
421 | } | |
422 | ||
423 | static void pmecc_substitute(struct mtd_info *mtd) | |
424 | { | |
425 | struct nand_chip *nand_chip = mtd->priv; | |
426 | struct atmel_nand_host *host = nand_chip->priv; | |
427 | int16_t __iomem *alpha_to = host->pmecc_alpha_to; | |
428 | int16_t __iomem *index_of = host->pmecc_index_of; | |
429 | int16_t *partial_syn = host->pmecc_partial_syn; | |
430 | const int cap = host->pmecc_corr_cap; | |
431 | int16_t *si; | |
432 | int i, j; | |
433 | ||
434 | /* si[] is a table that holds the current syndrome value, | |
435 | * an element of that table belongs to the field | |
436 | */ | |
437 | si = host->pmecc_si; | |
438 | ||
439 | memset(&si[1], 0, sizeof(int16_t) * (2 * cap - 1)); | |
440 | ||
441 | /* Computation 2t syndromes based on S(x) */ | |
442 | /* Odd syndromes */ | |
443 | for (i = 1; i < 2 * cap; i += 2) { | |
444 | for (j = 0; j < host->pmecc_degree; j++) { | |
445 | if (partial_syn[i] & ((unsigned short)0x1 << j)) | |
446 | si[i] = readw_relaxed(alpha_to + i * j) ^ si[i]; | |
447 | } | |
448 | } | |
449 | /* Even syndrome = (Odd syndrome) ** 2 */ | |
450 | for (i = 2, j = 1; j <= cap; i = ++j << 1) { | |
451 | if (si[j] == 0) { | |
452 | si[i] = 0; | |
453 | } else { | |
454 | int16_t tmp; | |
455 | ||
456 | tmp = readw_relaxed(index_of + si[j]); | |
457 | tmp = (tmp * 2) % host->pmecc_cw_len; | |
458 | si[i] = readw_relaxed(alpha_to + tmp); | |
459 | } | |
460 | } | |
461 | ||
462 | return; | |
463 | } | |
464 | ||
465 | static void pmecc_get_sigma(struct mtd_info *mtd) | |
466 | { | |
467 | struct nand_chip *nand_chip = mtd->priv; | |
468 | struct atmel_nand_host *host = nand_chip->priv; | |
469 | ||
470 | int16_t *lmu = host->pmecc_lmu; | |
471 | int16_t *si = host->pmecc_si; | |
472 | int *mu = host->pmecc_mu; | |
473 | int *dmu = host->pmecc_dmu; /* Discrepancy */ | |
474 | int *delta = host->pmecc_delta; /* Delta order */ | |
475 | int cw_len = host->pmecc_cw_len; | |
476 | const int16_t cap = host->pmecc_corr_cap; | |
477 | const int num = 2 * cap + 1; | |
478 | int16_t __iomem *index_of = host->pmecc_index_of; | |
479 | int16_t __iomem *alpha_to = host->pmecc_alpha_to; | |
480 | int i, j, k; | |
481 | uint32_t dmu_0_count, tmp; | |
482 | int16_t *smu = host->pmecc_smu; | |
483 | ||
484 | /* index of largest delta */ | |
485 | int ro; | |
486 | int largest; | |
487 | int diff; | |
488 | ||
489 | dmu_0_count = 0; | |
490 | ||
491 | /* First Row */ | |
492 | ||
493 | /* Mu */ | |
494 | mu[0] = -1; | |
495 | ||
496 | memset(smu, 0, sizeof(int16_t) * num); | |
497 | smu[0] = 1; | |
498 | ||
499 | /* discrepancy set to 1 */ | |
500 | dmu[0] = 1; | |
501 | /* polynom order set to 0 */ | |
502 | lmu[0] = 0; | |
503 | delta[0] = (mu[0] * 2 - lmu[0]) >> 1; | |
504 | ||
505 | /* Second Row */ | |
506 | ||
507 | /* Mu */ | |
508 | mu[1] = 0; | |
509 | /* Sigma(x) set to 1 */ | |
510 | memset(&smu[num], 0, sizeof(int16_t) * num); | |
511 | smu[num] = 1; | |
512 | ||
513 | /* discrepancy set to S1 */ | |
514 | dmu[1] = si[1]; | |
515 | ||
516 | /* polynom order set to 0 */ | |
517 | lmu[1] = 0; | |
518 | ||
519 | delta[1] = (mu[1] * 2 - lmu[1]) >> 1; | |
520 | ||
521 | /* Init the Sigma(x) last row */ | |
522 | memset(&smu[(cap + 1) * num], 0, sizeof(int16_t) * num); | |
523 | ||
524 | for (i = 1; i <= cap; i++) { | |
525 | mu[i + 1] = i << 1; | |
526 | /* Begin Computing Sigma (Mu+1) and L(mu) */ | |
527 | /* check if discrepancy is set to 0 */ | |
528 | if (dmu[i] == 0) { | |
529 | dmu_0_count++; | |
530 | ||
531 | tmp = ((cap - (lmu[i] >> 1) - 1) / 2); | |
532 | if ((cap - (lmu[i] >> 1) - 1) & 0x1) | |
533 | tmp += 2; | |
534 | else | |
535 | tmp += 1; | |
536 | ||
537 | if (dmu_0_count == tmp) { | |
538 | for (j = 0; j <= (lmu[i] >> 1) + 1; j++) | |
539 | smu[(cap + 1) * num + j] = | |
540 | smu[i * num + j]; | |
541 | ||
542 | lmu[cap + 1] = lmu[i]; | |
543 | return; | |
544 | } | |
545 | ||
546 | /* copy polynom */ | |
547 | for (j = 0; j <= lmu[i] >> 1; j++) | |
548 | smu[(i + 1) * num + j] = smu[i * num + j]; | |
549 | ||
550 | /* copy previous polynom order to the next */ | |
551 | lmu[i + 1] = lmu[i]; | |
552 | } else { | |
553 | ro = 0; | |
554 | largest = -1; | |
555 | /* find largest delta with dmu != 0 */ | |
556 | for (j = 0; j < i; j++) { | |
557 | if ((dmu[j]) && (delta[j] > largest)) { | |
558 | largest = delta[j]; | |
559 | ro = j; | |
560 | } | |
561 | } | |
562 | ||
563 | /* compute difference */ | |
564 | diff = (mu[i] - mu[ro]); | |
565 | ||
566 | /* Compute degree of the new smu polynomial */ | |
567 | if ((lmu[i] >> 1) > ((lmu[ro] >> 1) + diff)) | |
568 | lmu[i + 1] = lmu[i]; | |
569 | else | |
570 | lmu[i + 1] = ((lmu[ro] >> 1) + diff) * 2; | |
571 | ||
572 | /* Init smu[i+1] with 0 */ | |
573 | for (k = 0; k < num; k++) | |
574 | smu[(i + 1) * num + k] = 0; | |
575 | ||
576 | /* Compute smu[i+1] */ | |
577 | for (k = 0; k <= lmu[ro] >> 1; k++) { | |
578 | int16_t a, b, c; | |
579 | ||
580 | if (!(smu[ro * num + k] && dmu[i])) | |
581 | continue; | |
582 | a = readw_relaxed(index_of + dmu[i]); | |
583 | b = readw_relaxed(index_of + dmu[ro]); | |
584 | c = readw_relaxed(index_of + smu[ro * num + k]); | |
585 | tmp = a + (cw_len - b) + c; | |
586 | a = readw_relaxed(alpha_to + tmp % cw_len); | |
587 | smu[(i + 1) * num + (k + diff)] = a; | |
588 | } | |
589 | ||
590 | for (k = 0; k <= lmu[i] >> 1; k++) | |
591 | smu[(i + 1) * num + k] ^= smu[i * num + k]; | |
592 | } | |
593 | ||
594 | /* End Computing Sigma (Mu+1) and L(mu) */ | |
595 | /* In either case compute delta */ | |
596 | delta[i + 1] = (mu[i + 1] * 2 - lmu[i + 1]) >> 1; | |
597 | ||
598 | /* Do not compute discrepancy for the last iteration */ | |
599 | if (i >= cap) | |
600 | continue; | |
601 | ||
602 | for (k = 0; k <= (lmu[i + 1] >> 1); k++) { | |
603 | tmp = 2 * (i - 1); | |
604 | if (k == 0) { | |
605 | dmu[i + 1] = si[tmp + 3]; | |
606 | } else if (smu[(i + 1) * num + k] && si[tmp + 3 - k]) { | |
607 | int16_t a, b, c; | |
608 | a = readw_relaxed(index_of + | |
609 | smu[(i + 1) * num + k]); | |
610 | b = si[2 * (i - 1) + 3 - k]; | |
611 | c = readw_relaxed(index_of + b); | |
612 | tmp = a + c; | |
613 | tmp %= cw_len; | |
614 | dmu[i + 1] = readw_relaxed(alpha_to + tmp) ^ | |
615 | dmu[i + 1]; | |
616 | } | |
617 | } | |
618 | } | |
619 | ||
620 | return; | |
621 | } | |
622 | ||
623 | static int pmecc_err_location(struct mtd_info *mtd) | |
624 | { | |
625 | struct nand_chip *nand_chip = mtd->priv; | |
626 | struct atmel_nand_host *host = nand_chip->priv; | |
627 | unsigned long end_time; | |
628 | const int cap = host->pmecc_corr_cap; | |
629 | const int num = 2 * cap + 1; | |
630 | int sector_size = host->pmecc_sector_size; | |
631 | int err_nbr = 0; /* number of error */ | |
632 | int roots_nbr; /* number of roots */ | |
633 | int i; | |
634 | uint32_t val; | |
635 | int16_t *smu = host->pmecc_smu; | |
636 | ||
637 | pmerrloc_writel(host->pmerrloc_base, ELDIS, PMERRLOC_DISABLE); | |
638 | ||
639 | for (i = 0; i <= host->pmecc_lmu[cap + 1] >> 1; i++) { | |
640 | pmerrloc_writel_sigma_relaxed(host->pmerrloc_base, i, | |
641 | smu[(cap + 1) * num + i]); | |
642 | err_nbr++; | |
643 | } | |
644 | ||
645 | val = (err_nbr - 1) << 16; | |
646 | if (sector_size == 1024) | |
647 | val |= 1; | |
648 | ||
649 | pmerrloc_writel(host->pmerrloc_base, ELCFG, val); | |
650 | pmerrloc_writel(host->pmerrloc_base, ELEN, | |
651 | sector_size * 8 + host->pmecc_degree * cap); | |
652 | ||
653 | end_time = jiffies + msecs_to_jiffies(PMECC_MAX_TIMEOUT_MS); | |
654 | while (!(pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR) | |
655 | & PMERRLOC_CALC_DONE)) { | |
656 | if (unlikely(time_after(jiffies, end_time))) { | |
657 | dev_err(host->dev, "PMECC: Timeout to calculate error location.\n"); | |
658 | return -1; | |
659 | } | |
660 | cpu_relax(); | |
661 | } | |
662 | ||
663 | roots_nbr = (pmerrloc_readl_relaxed(host->pmerrloc_base, ELISR) | |
664 | & PMERRLOC_ERR_NUM_MASK) >> 8; | |
665 | /* Number of roots == degree of smu hence <= cap */ | |
666 | if (roots_nbr == host->pmecc_lmu[cap + 1] >> 1) | |
667 | return err_nbr - 1; | |
668 | ||
669 | /* Number of roots does not match the degree of smu | |
670 | * unable to correct error */ | |
671 | return -1; | |
672 | } | |
673 | ||
674 | static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc, | |
675 | int sector_num, int extra_bytes, int err_nbr) | |
676 | { | |
677 | struct nand_chip *nand_chip = mtd->priv; | |
678 | struct atmel_nand_host *host = nand_chip->priv; | |
679 | int i = 0; | |
680 | int byte_pos, bit_pos, sector_size, pos; | |
681 | uint32_t tmp; | |
682 | uint8_t err_byte; | |
683 | ||
684 | sector_size = host->pmecc_sector_size; | |
685 | ||
686 | while (err_nbr) { | |
687 | tmp = pmerrloc_readl_el_relaxed(host->pmerrloc_base, i) - 1; | |
688 | byte_pos = tmp / 8; | |
689 | bit_pos = tmp % 8; | |
690 | ||
691 | if (byte_pos >= (sector_size + extra_bytes)) | |
692 | BUG(); /* should never happen */ | |
693 | ||
694 | if (byte_pos < sector_size) { | |
695 | err_byte = *(buf + byte_pos); | |
696 | *(buf + byte_pos) ^= (1 << bit_pos); | |
697 | ||
698 | pos = sector_num * host->pmecc_sector_size + byte_pos; | |
699 | dev_info(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n", | |
700 | pos, bit_pos, err_byte, *(buf + byte_pos)); | |
701 | } else { | |
702 | /* Bit flip in OOB area */ | |
703 | tmp = sector_num * host->pmecc_bytes_per_sector | |
704 | + (byte_pos - sector_size); | |
705 | err_byte = ecc[tmp]; | |
706 | ecc[tmp] ^= (1 << bit_pos); | |
707 | ||
708 | pos = tmp + nand_chip->ecc.layout->eccpos[0]; | |
709 | dev_info(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n", | |
710 | pos, bit_pos, err_byte, ecc[tmp]); | |
711 | } | |
712 | ||
713 | i++; | |
714 | err_nbr--; | |
715 | } | |
716 | ||
717 | return; | |
718 | } | |
719 | ||
720 | static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf, | |
721 | u8 *ecc) | |
722 | { | |
723 | struct nand_chip *nand_chip = mtd->priv; | |
724 | struct atmel_nand_host *host = nand_chip->priv; | |
725 | int i, err_nbr, eccbytes; | |
726 | uint8_t *buf_pos; | |
c0c70d9e | 727 | int total_err = 0; |
1c7b874d JW |
728 | |
729 | eccbytes = nand_chip->ecc.bytes; | |
730 | for (i = 0; i < eccbytes; i++) | |
731 | if (ecc[i] != 0xff) | |
732 | goto normal_check; | |
733 | /* Erased page, return OK */ | |
734 | return 0; | |
735 | ||
736 | normal_check: | |
737 | for (i = 0; i < host->pmecc_sector_number; i++) { | |
738 | err_nbr = 0; | |
739 | if (pmecc_stat & 0x1) { | |
740 | buf_pos = buf + i * host->pmecc_sector_size; | |
741 | ||
742 | pmecc_gen_syndrome(mtd, i); | |
743 | pmecc_substitute(mtd); | |
744 | pmecc_get_sigma(mtd); | |
745 | ||
746 | err_nbr = pmecc_err_location(mtd); | |
747 | if (err_nbr == -1) { | |
748 | dev_err(host->dev, "PMECC: Too many errors\n"); | |
749 | mtd->ecc_stats.failed++; | |
750 | return -EIO; | |
751 | } else { | |
752 | pmecc_correct_data(mtd, buf_pos, ecc, i, | |
753 | host->pmecc_bytes_per_sector, err_nbr); | |
754 | mtd->ecc_stats.corrected += err_nbr; | |
c0c70d9e | 755 | total_err += err_nbr; |
1c7b874d JW |
756 | } |
757 | } | |
758 | pmecc_stat >>= 1; | |
759 | } | |
760 | ||
c0c70d9e | 761 | return total_err; |
1c7b874d JW |
762 | } |
763 | ||
764 | static int atmel_nand_pmecc_read_page(struct mtd_info *mtd, | |
765 | struct nand_chip *chip, uint8_t *buf, int oob_required, int page) | |
766 | { | |
767 | struct atmel_nand_host *host = chip->priv; | |
768 | int eccsize = chip->ecc.size; | |
769 | uint8_t *oob = chip->oob_poi; | |
770 | uint32_t *eccpos = chip->ecc.layout->eccpos; | |
771 | uint32_t stat; | |
772 | unsigned long end_time; | |
c0c70d9e | 773 | int bitflips = 0; |
1c7b874d JW |
774 | |
775 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST); | |
776 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE); | |
777 | pmecc_writel(host->ecc, CFG, (pmecc_readl_relaxed(host->ecc, CFG) | |
778 | & ~PMECC_CFG_WRITE_OP) | PMECC_CFG_AUTO_ENABLE); | |
779 | ||
780 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE); | |
781 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DATA); | |
782 | ||
783 | chip->read_buf(mtd, buf, eccsize); | |
784 | chip->read_buf(mtd, oob, mtd->oobsize); | |
785 | ||
786 | end_time = jiffies + msecs_to_jiffies(PMECC_MAX_TIMEOUT_MS); | |
787 | while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) { | |
788 | if (unlikely(time_after(jiffies, end_time))) { | |
789 | dev_err(host->dev, "PMECC: Timeout to get error status.\n"); | |
790 | return -EIO; | |
791 | } | |
792 | cpu_relax(); | |
793 | } | |
794 | ||
795 | stat = pmecc_readl_relaxed(host->ecc, ISR); | |
c0c70d9e JW |
796 | if (stat != 0) { |
797 | bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]); | |
798 | if (bitflips < 0) | |
799 | /* uncorrectable errors */ | |
800 | return 0; | |
801 | } | |
1c7b874d | 802 | |
c0c70d9e | 803 | return bitflips; |
1c7b874d JW |
804 | } |
805 | ||
806 | static int atmel_nand_pmecc_write_page(struct mtd_info *mtd, | |
807 | struct nand_chip *chip, const uint8_t *buf, int oob_required) | |
808 | { | |
809 | struct atmel_nand_host *host = chip->priv; | |
810 | uint32_t *eccpos = chip->ecc.layout->eccpos; | |
811 | int i, j; | |
812 | unsigned long end_time; | |
813 | ||
814 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST); | |
815 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE); | |
816 | ||
817 | pmecc_writel(host->ecc, CFG, (pmecc_readl_relaxed(host->ecc, CFG) | | |
818 | PMECC_CFG_WRITE_OP) & ~PMECC_CFG_AUTO_ENABLE); | |
819 | ||
820 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE); | |
821 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DATA); | |
822 | ||
823 | chip->write_buf(mtd, (u8 *)buf, mtd->writesize); | |
824 | ||
825 | end_time = jiffies + msecs_to_jiffies(PMECC_MAX_TIMEOUT_MS); | |
826 | while ((pmecc_readl_relaxed(host->ecc, SR) & PMECC_SR_BUSY)) { | |
827 | if (unlikely(time_after(jiffies, end_time))) { | |
828 | dev_err(host->dev, "PMECC: Timeout to get ECC value.\n"); | |
829 | return -EIO; | |
830 | } | |
831 | cpu_relax(); | |
832 | } | |
833 | ||
834 | for (i = 0; i < host->pmecc_sector_number; i++) { | |
835 | for (j = 0; j < host->pmecc_bytes_per_sector; j++) { | |
836 | int pos; | |
837 | ||
838 | pos = i * host->pmecc_bytes_per_sector + j; | |
839 | chip->oob_poi[eccpos[pos]] = | |
840 | pmecc_readb_ecc_relaxed(host->ecc, i, j); | |
841 | } | |
842 | } | |
843 | chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); | |
844 | ||
845 | return 0; | |
846 | } | |
847 | ||
848 | static void atmel_pmecc_core_init(struct mtd_info *mtd) | |
849 | { | |
850 | struct nand_chip *nand_chip = mtd->priv; | |
851 | struct atmel_nand_host *host = nand_chip->priv; | |
852 | uint32_t val = 0; | |
853 | struct nand_ecclayout *ecc_layout; | |
854 | ||
855 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST); | |
856 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE); | |
857 | ||
858 | switch (host->pmecc_corr_cap) { | |
859 | case 2: | |
860 | val = PMECC_CFG_BCH_ERR2; | |
861 | break; | |
862 | case 4: | |
863 | val = PMECC_CFG_BCH_ERR4; | |
864 | break; | |
865 | case 8: | |
866 | val = PMECC_CFG_BCH_ERR8; | |
867 | break; | |
868 | case 12: | |
869 | val = PMECC_CFG_BCH_ERR12; | |
870 | break; | |
871 | case 24: | |
872 | val = PMECC_CFG_BCH_ERR24; | |
873 | break; | |
874 | } | |
875 | ||
876 | if (host->pmecc_sector_size == 512) | |
877 | val |= PMECC_CFG_SECTOR512; | |
878 | else if (host->pmecc_sector_size == 1024) | |
879 | val |= PMECC_CFG_SECTOR1024; | |
880 | ||
881 | switch (host->pmecc_sector_number) { | |
882 | case 1: | |
883 | val |= PMECC_CFG_PAGE_1SECTOR; | |
884 | break; | |
885 | case 2: | |
886 | val |= PMECC_CFG_PAGE_2SECTORS; | |
887 | break; | |
888 | case 4: | |
889 | val |= PMECC_CFG_PAGE_4SECTORS; | |
890 | break; | |
891 | case 8: | |
892 | val |= PMECC_CFG_PAGE_8SECTORS; | |
893 | break; | |
894 | } | |
895 | ||
896 | val |= (PMECC_CFG_READ_OP | PMECC_CFG_SPARE_DISABLE | |
897 | | PMECC_CFG_AUTO_DISABLE); | |
898 | pmecc_writel(host->ecc, CFG, val); | |
899 | ||
900 | ecc_layout = nand_chip->ecc.layout; | |
901 | pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1); | |
902 | pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]); | |
903 | pmecc_writel(host->ecc, EADDR, | |
904 | ecc_layout->eccpos[ecc_layout->eccbytes - 1]); | |
905 | /* See datasheet about PMECC Clock Control Register */ | |
906 | pmecc_writel(host->ecc, CLK, 2); | |
907 | pmecc_writel(host->ecc, IDR, 0xff); | |
908 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_ENABLE); | |
909 | } | |
910 | ||
911 | static int __init atmel_pmecc_nand_init_params(struct platform_device *pdev, | |
912 | struct atmel_nand_host *host) | |
913 | { | |
914 | struct mtd_info *mtd = &host->mtd; | |
915 | struct nand_chip *nand_chip = &host->nand_chip; | |
916 | struct resource *regs, *regs_pmerr, *regs_rom; | |
917 | int cap, sector_size, err_no; | |
918 | ||
919 | cap = host->pmecc_corr_cap; | |
920 | sector_size = host->pmecc_sector_size; | |
921 | dev_info(host->dev, "Initialize PMECC params, cap: %d, sector: %d\n", | |
922 | cap, sector_size); | |
923 | ||
924 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
925 | if (!regs) { | |
926 | dev_warn(host->dev, | |
927 | "Can't get I/O resource regs for PMECC controller, rolling back on software ECC\n"); | |
928 | nand_chip->ecc.mode = NAND_ECC_SOFT; | |
929 | return 0; | |
930 | } | |
931 | ||
932 | host->ecc = ioremap(regs->start, resource_size(regs)); | |
933 | if (host->ecc == NULL) { | |
934 | dev_err(host->dev, "ioremap failed\n"); | |
935 | err_no = -EIO; | |
936 | goto err_pmecc_ioremap; | |
937 | } | |
938 | ||
939 | regs_pmerr = platform_get_resource(pdev, IORESOURCE_MEM, 2); | |
940 | regs_rom = platform_get_resource(pdev, IORESOURCE_MEM, 3); | |
941 | if (regs_pmerr && regs_rom) { | |
942 | host->pmerrloc_base = ioremap(regs_pmerr->start, | |
943 | resource_size(regs_pmerr)); | |
944 | host->pmecc_rom_base = ioremap(regs_rom->start, | |
945 | resource_size(regs_rom)); | |
946 | } | |
947 | ||
948 | if (!host->pmerrloc_base || !host->pmecc_rom_base) { | |
949 | dev_err(host->dev, | |
950 | "Can not get I/O resource for PMECC ERRLOC controller or ROM!\n"); | |
951 | err_no = -EIO; | |
952 | goto err_pmloc_ioremap; | |
953 | } | |
954 | ||
955 | /* ECC is calculated for the whole page (1 step) */ | |
956 | nand_chip->ecc.size = mtd->writesize; | |
957 | ||
958 | /* set ECC page size and oob layout */ | |
959 | switch (mtd->writesize) { | |
960 | case 2048: | |
961 | host->pmecc_degree = PMECC_GF_DIMENSION_13; | |
962 | host->pmecc_cw_len = (1 << host->pmecc_degree) - 1; | |
963 | host->pmecc_sector_number = mtd->writesize / sector_size; | |
964 | host->pmecc_bytes_per_sector = pmecc_get_ecc_bytes( | |
965 | cap, sector_size); | |
966 | host->pmecc_alpha_to = pmecc_get_alpha_to(host); | |
967 | host->pmecc_index_of = host->pmecc_rom_base + | |
968 | host->pmecc_lookup_table_offset; | |
969 | ||
970 | nand_chip->ecc.steps = 1; | |
971 | nand_chip->ecc.strength = cap; | |
972 | nand_chip->ecc.bytes = host->pmecc_bytes_per_sector * | |
973 | host->pmecc_sector_number; | |
974 | if (nand_chip->ecc.bytes > mtd->oobsize - 2) { | |
975 | dev_err(host->dev, "No room for ECC bytes\n"); | |
976 | err_no = -EINVAL; | |
977 | goto err_no_ecc_room; | |
978 | } | |
979 | pmecc_config_ecc_layout(&atmel_pmecc_oobinfo, | |
980 | mtd->oobsize, | |
981 | nand_chip->ecc.bytes); | |
982 | nand_chip->ecc.layout = &atmel_pmecc_oobinfo; | |
983 | break; | |
984 | case 512: | |
985 | case 1024: | |
986 | case 4096: | |
987 | /* TODO */ | |
988 | dev_warn(host->dev, | |
989 | "Unsupported page size for PMECC, use Software ECC\n"); | |
990 | default: | |
991 | /* page size not handled by HW ECC */ | |
992 | /* switching back to soft ECC */ | |
993 | nand_chip->ecc.mode = NAND_ECC_SOFT; | |
994 | return 0; | |
995 | } | |
996 | ||
997 | /* Allocate data for PMECC computation */ | |
998 | err_no = pmecc_data_alloc(host); | |
999 | if (err_no) { | |
1000 | dev_err(host->dev, | |
1001 | "Cannot allocate memory for PMECC computation!\n"); | |
1002 | goto err_pmecc_data_alloc; | |
1003 | } | |
1004 | ||
1005 | nand_chip->ecc.read_page = atmel_nand_pmecc_read_page; | |
1006 | nand_chip->ecc.write_page = atmel_nand_pmecc_write_page; | |
1007 | ||
1008 | atmel_pmecc_core_init(mtd); | |
1009 | ||
1010 | return 0; | |
1011 | ||
1012 | err_pmecc_data_alloc: | |
1013 | err_no_ecc_room: | |
1014 | err_pmloc_ioremap: | |
1015 | iounmap(host->ecc); | |
1016 | if (host->pmerrloc_base) | |
1017 | iounmap(host->pmerrloc_base); | |
1018 | if (host->pmecc_rom_base) | |
1019 | iounmap(host->pmecc_rom_base); | |
1020 | err_pmecc_ioremap: | |
1021 | return err_no; | |
1022 | } | |
1023 | ||
77f5492c RG |
1024 | /* |
1025 | * Calculate HW ECC | |
1026 | * | |
1027 | * function called after a write | |
1028 | * | |
1029 | * mtd: MTD block structure | |
1030 | * dat: raw data (unused) | |
1031 | * ecc_code: buffer for ECC | |
1032 | */ | |
3c3796cc | 1033 | static int atmel_nand_calculate(struct mtd_info *mtd, |
77f5492c RG |
1034 | const u_char *dat, unsigned char *ecc_code) |
1035 | { | |
1036 | struct nand_chip *nand_chip = mtd->priv; | |
3c3796cc | 1037 | struct atmel_nand_host *host = nand_chip->priv; |
77f5492c RG |
1038 | unsigned int ecc_value; |
1039 | ||
1040 | /* get the first 2 ECC bytes */ | |
d43fa149 | 1041 | ecc_value = ecc_readl(host->ecc, PR); |
77f5492c | 1042 | |
3fc23898 RG |
1043 | ecc_code[0] = ecc_value & 0xFF; |
1044 | ecc_code[1] = (ecc_value >> 8) & 0xFF; | |
77f5492c RG |
1045 | |
1046 | /* get the last 2 ECC bytes */ | |
3c3796cc | 1047 | ecc_value = ecc_readl(host->ecc, NPR) & ATMEL_ECC_NPARITY; |
77f5492c | 1048 | |
3fc23898 RG |
1049 | ecc_code[2] = ecc_value & 0xFF; |
1050 | ecc_code[3] = (ecc_value >> 8) & 0xFF; | |
77f5492c RG |
1051 | |
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * HW ECC read page function | |
1057 | * | |
1058 | * mtd: mtd info structure | |
1059 | * chip: nand chip info structure | |
1060 | * buf: buffer to store read data | |
1fbb938d | 1061 | * oob_required: caller expects OOB data read to chip->oob_poi |
77f5492c | 1062 | */ |
1fbb938d BN |
1063 | static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip, |
1064 | uint8_t *buf, int oob_required, int page) | |
77f5492c RG |
1065 | { |
1066 | int eccsize = chip->ecc.size; | |
1067 | int eccbytes = chip->ecc.bytes; | |
1068 | uint32_t *eccpos = chip->ecc.layout->eccpos; | |
1069 | uint8_t *p = buf; | |
1070 | uint8_t *oob = chip->oob_poi; | |
1071 | uint8_t *ecc_pos; | |
1072 | int stat; | |
3f91e94f | 1073 | unsigned int max_bitflips = 0; |
77f5492c | 1074 | |
d6248fdd HS |
1075 | /* |
1076 | * Errata: ALE is incorrectly wired up to the ECC controller | |
1077 | * on the AP7000, so it will include the address cycles in the | |
1078 | * ECC calculation. | |
1079 | * | |
1080 | * Workaround: Reset the parity registers before reading the | |
1081 | * actual data. | |
1082 | */ | |
1083 | if (cpu_is_at32ap7000()) { | |
1084 | struct atmel_nand_host *host = chip->priv; | |
1085 | ecc_writel(host->ecc, CR, ATMEL_ECC_RST); | |
1086 | } | |
1087 | ||
77f5492c RG |
1088 | /* read the page */ |
1089 | chip->read_buf(mtd, p, eccsize); | |
1090 | ||
1091 | /* move to ECC position if needed */ | |
1092 | if (eccpos[0] != 0) { | |
1093 | /* This only works on large pages | |
1094 | * because the ECC controller waits for | |
1095 | * NAND_CMD_RNDOUTSTART after the | |
1096 | * NAND_CMD_RNDOUT. | |
1097 | * anyway, for small pages, the eccpos[0] == 0 | |
1098 | */ | |
1099 | chip->cmdfunc(mtd, NAND_CMD_RNDOUT, | |
1100 | mtd->writesize + eccpos[0], -1); | |
1101 | } | |
1102 | ||
1103 | /* the ECC controller needs to read the ECC just after the data */ | |
1104 | ecc_pos = oob + eccpos[0]; | |
1105 | chip->read_buf(mtd, ecc_pos, eccbytes); | |
1106 | ||
1107 | /* check if there's an error */ | |
1108 | stat = chip->ecc.correct(mtd, p, oob, NULL); | |
1109 | ||
3f91e94f | 1110 | if (stat < 0) { |
77f5492c | 1111 | mtd->ecc_stats.failed++; |
3f91e94f | 1112 | } else { |
77f5492c | 1113 | mtd->ecc_stats.corrected += stat; |
3f91e94f MD |
1114 | max_bitflips = max_t(unsigned int, max_bitflips, stat); |
1115 | } | |
77f5492c RG |
1116 | |
1117 | /* get back to oob start (end of page) */ | |
1118 | chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1); | |
1119 | ||
1120 | /* read the oob */ | |
1121 | chip->read_buf(mtd, oob, mtd->oobsize); | |
1122 | ||
3f91e94f | 1123 | return max_bitflips; |
77f5492c RG |
1124 | } |
1125 | ||
1126 | /* | |
1127 | * HW ECC Correction | |
1128 | * | |
1129 | * function called after a read | |
1130 | * | |
1131 | * mtd: MTD block structure | |
1132 | * dat: raw data read from the chip | |
1133 | * read_ecc: ECC from the chip (unused) | |
1134 | * isnull: unused | |
1135 | * | |
1136 | * Detect and correct a 1 bit error for a page | |
1137 | */ | |
3c3796cc | 1138 | static int atmel_nand_correct(struct mtd_info *mtd, u_char *dat, |
77f5492c RG |
1139 | u_char *read_ecc, u_char *isnull) |
1140 | { | |
1141 | struct nand_chip *nand_chip = mtd->priv; | |
3c3796cc | 1142 | struct atmel_nand_host *host = nand_chip->priv; |
77f5492c RG |
1143 | unsigned int ecc_status; |
1144 | unsigned int ecc_word, ecc_bit; | |
1145 | ||
1146 | /* get the status from the Status Register */ | |
1147 | ecc_status = ecc_readl(host->ecc, SR); | |
1148 | ||
1149 | /* if there's no error */ | |
3c3796cc | 1150 | if (likely(!(ecc_status & ATMEL_ECC_RECERR))) |
77f5492c RG |
1151 | return 0; |
1152 | ||
1153 | /* get error bit offset (4 bits) */ | |
3c3796cc | 1154 | ecc_bit = ecc_readl(host->ecc, PR) & ATMEL_ECC_BITADDR; |
77f5492c | 1155 | /* get word address (12 bits) */ |
3c3796cc | 1156 | ecc_word = ecc_readl(host->ecc, PR) & ATMEL_ECC_WORDADDR; |
77f5492c RG |
1157 | ecc_word >>= 4; |
1158 | ||
1159 | /* if there are multiple errors */ | |
3c3796cc | 1160 | if (ecc_status & ATMEL_ECC_MULERR) { |
77f5492c RG |
1161 | /* check if it is a freshly erased block |
1162 | * (filled with 0xff) */ | |
3c3796cc HS |
1163 | if ((ecc_bit == ATMEL_ECC_BITADDR) |
1164 | && (ecc_word == (ATMEL_ECC_WORDADDR >> 4))) { | |
77f5492c RG |
1165 | /* the block has just been erased, return OK */ |
1166 | return 0; | |
1167 | } | |
1168 | /* it doesn't seems to be a freshly | |
1169 | * erased block. | |
1170 | * We can't correct so many errors */ | |
3c3796cc | 1171 | dev_dbg(host->dev, "atmel_nand : multiple errors detected." |
77f5492c RG |
1172 | " Unable to correct.\n"); |
1173 | return -EIO; | |
1174 | } | |
1175 | ||
1176 | /* if there's a single bit error : we can correct it */ | |
3c3796cc | 1177 | if (ecc_status & ATMEL_ECC_ECCERR) { |
77f5492c RG |
1178 | /* there's nothing much to do here. |
1179 | * the bit error is on the ECC itself. | |
1180 | */ | |
3c3796cc | 1181 | dev_dbg(host->dev, "atmel_nand : one bit error on ECC code." |
77f5492c RG |
1182 | " Nothing to correct\n"); |
1183 | return 0; | |
1184 | } | |
1185 | ||
3c3796cc | 1186 | dev_dbg(host->dev, "atmel_nand : one bit error on data." |
77f5492c RG |
1187 | " (word offset in the page :" |
1188 | " 0x%x bit offset : 0x%x)\n", | |
1189 | ecc_word, ecc_bit); | |
1190 | /* correct the error */ | |
1191 | if (nand_chip->options & NAND_BUSWIDTH_16) { | |
1192 | /* 16 bits words */ | |
1193 | ((unsigned short *) dat)[ecc_word] ^= (1 << ecc_bit); | |
1194 | } else { | |
1195 | /* 8 bits words */ | |
1196 | dat[ecc_word] ^= (1 << ecc_bit); | |
1197 | } | |
3c3796cc | 1198 | dev_dbg(host->dev, "atmel_nand : error corrected\n"); |
77f5492c RG |
1199 | return 1; |
1200 | } | |
1201 | ||
1202 | /* | |
d6248fdd | 1203 | * Enable HW ECC : unused on most chips |
77f5492c | 1204 | */ |
d6248fdd HS |
1205 | static void atmel_nand_hwctl(struct mtd_info *mtd, int mode) |
1206 | { | |
1207 | if (cpu_is_at32ap7000()) { | |
1208 | struct nand_chip *nand_chip = mtd->priv; | |
1209 | struct atmel_nand_host *host = nand_chip->priv; | |
1210 | ecc_writel(host->ecc, CR, ATMEL_ECC_RST); | |
1211 | } | |
1212 | } | |
77f5492c | 1213 | |
d6a01661 | 1214 | #if defined(CONFIG_OF) |
06f25510 | 1215 | static int atmel_of_init_port(struct atmel_nand_host *host, |
d8929942 | 1216 | struct device_node *np) |
d6a01661 | 1217 | { |
a41b51a1 JW |
1218 | u32 val, table_offset; |
1219 | u32 offset[2]; | |
d6a01661 JCPV |
1220 | int ecc_mode; |
1221 | struct atmel_nand_data *board = &host->board; | |
1222 | enum of_gpio_flags flags; | |
1223 | ||
1224 | if (of_property_read_u32(np, "atmel,nand-addr-offset", &val) == 0) { | |
1225 | if (val >= 32) { | |
1226 | dev_err(host->dev, "invalid addr-offset %u\n", val); | |
1227 | return -EINVAL; | |
1228 | } | |
1229 | board->ale = val; | |
1230 | } | |
1231 | ||
1232 | if (of_property_read_u32(np, "atmel,nand-cmd-offset", &val) == 0) { | |
1233 | if (val >= 32) { | |
1234 | dev_err(host->dev, "invalid cmd-offset %u\n", val); | |
1235 | return -EINVAL; | |
1236 | } | |
1237 | board->cle = val; | |
1238 | } | |
1239 | ||
1240 | ecc_mode = of_get_nand_ecc_mode(np); | |
1241 | ||
1242 | board->ecc_mode = ecc_mode < 0 ? NAND_ECC_SOFT : ecc_mode; | |
1243 | ||
1244 | board->on_flash_bbt = of_get_nand_on_flash_bbt(np); | |
1245 | ||
1246 | if (of_get_nand_bus_width(np) == 16) | |
1247 | board->bus_width_16 = 1; | |
1248 | ||
1249 | board->rdy_pin = of_get_gpio_flags(np, 0, &flags); | |
1250 | board->rdy_pin_active_low = (flags == OF_GPIO_ACTIVE_LOW); | |
1251 | ||
1252 | board->enable_pin = of_get_gpio(np, 1); | |
1253 | board->det_pin = of_get_gpio(np, 2); | |
1254 | ||
a41b51a1 JW |
1255 | host->has_pmecc = of_property_read_bool(np, "atmel,has-pmecc"); |
1256 | ||
1257 | if (!(board->ecc_mode == NAND_ECC_HW) || !host->has_pmecc) | |
1258 | return 0; /* Not using PMECC */ | |
1259 | ||
1260 | /* use PMECC, get correction capability, sector size and lookup | |
1261 | * table offset. | |
1262 | */ | |
1263 | if (of_property_read_u32(np, "atmel,pmecc-cap", &val) != 0) { | |
1264 | dev_err(host->dev, "Cannot decide PMECC Capability\n"); | |
1265 | return -EINVAL; | |
1266 | } else if ((val != 2) && (val != 4) && (val != 8) && (val != 12) && | |
1267 | (val != 24)) { | |
1268 | dev_err(host->dev, | |
1269 | "Unsupported PMECC correction capability: %d; should be 2, 4, 8, 12 or 24\n", | |
1270 | val); | |
1271 | return -EINVAL; | |
1272 | } | |
1273 | host->pmecc_corr_cap = (u8)val; | |
1274 | ||
1275 | if (of_property_read_u32(np, "atmel,pmecc-sector-size", &val) != 0) { | |
1276 | dev_err(host->dev, "Cannot decide PMECC Sector Size\n"); | |
1277 | return -EINVAL; | |
1278 | } else if ((val != 512) && (val != 1024)) { | |
1279 | dev_err(host->dev, | |
1280 | "Unsupported PMECC sector size: %d; should be 512 or 1024 bytes\n", | |
1281 | val); | |
1282 | return -EINVAL; | |
1283 | } | |
1284 | host->pmecc_sector_size = (u16)val; | |
1285 | ||
1286 | if (of_property_read_u32_array(np, "atmel,pmecc-lookup-table-offset", | |
1287 | offset, 2) != 0) { | |
1288 | dev_err(host->dev, "Cannot get PMECC lookup table offset\n"); | |
1289 | return -EINVAL; | |
1290 | } | |
1291 | table_offset = host->pmecc_sector_size == 512 ? offset[0] : offset[1]; | |
1292 | ||
1293 | if (!table_offset) { | |
1294 | dev_err(host->dev, "Invalid PMECC lookup table offset\n"); | |
1295 | return -EINVAL; | |
1296 | } | |
1297 | host->pmecc_lookup_table_offset = table_offset; | |
1298 | ||
d6a01661 JCPV |
1299 | return 0; |
1300 | } | |
1301 | #else | |
06f25510 | 1302 | static int atmel_of_init_port(struct atmel_nand_host *host, |
d8929942 | 1303 | struct device_node *np) |
d6a01661 JCPV |
1304 | { |
1305 | return -EINVAL; | |
1306 | } | |
1307 | #endif | |
1308 | ||
3dfe41a4 JW |
1309 | static int __init atmel_hw_nand_init_params(struct platform_device *pdev, |
1310 | struct atmel_nand_host *host) | |
1311 | { | |
1312 | struct mtd_info *mtd = &host->mtd; | |
1313 | struct nand_chip *nand_chip = &host->nand_chip; | |
1314 | struct resource *regs; | |
1315 | ||
1316 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
1317 | if (!regs) { | |
1318 | dev_err(host->dev, | |
1319 | "Can't get I/O resource regs, use software ECC\n"); | |
1320 | nand_chip->ecc.mode = NAND_ECC_SOFT; | |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | host->ecc = ioremap(regs->start, resource_size(regs)); | |
1325 | if (host->ecc == NULL) { | |
1326 | dev_err(host->dev, "ioremap failed\n"); | |
1327 | return -EIO; | |
1328 | } | |
1329 | ||
1330 | /* ECC is calculated for the whole page (1 step) */ | |
1331 | nand_chip->ecc.size = mtd->writesize; | |
1332 | ||
1333 | /* set ECC page size and oob layout */ | |
1334 | switch (mtd->writesize) { | |
1335 | case 512: | |
1336 | nand_chip->ecc.layout = &atmel_oobinfo_small; | |
1337 | ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528); | |
1338 | break; | |
1339 | case 1024: | |
1340 | nand_chip->ecc.layout = &atmel_oobinfo_large; | |
1341 | ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056); | |
1342 | break; | |
1343 | case 2048: | |
1344 | nand_chip->ecc.layout = &atmel_oobinfo_large; | |
1345 | ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112); | |
1346 | break; | |
1347 | case 4096: | |
1348 | nand_chip->ecc.layout = &atmel_oobinfo_large; | |
1349 | ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224); | |
1350 | break; | |
1351 | default: | |
1352 | /* page size not handled by HW ECC */ | |
1353 | /* switching back to soft ECC */ | |
1354 | nand_chip->ecc.mode = NAND_ECC_SOFT; | |
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | /* set up for HW ECC */ | |
1359 | nand_chip->ecc.calculate = atmel_nand_calculate; | |
1360 | nand_chip->ecc.correct = atmel_nand_correct; | |
1361 | nand_chip->ecc.hwctl = atmel_nand_hwctl; | |
1362 | nand_chip->ecc.read_page = atmel_nand_read_page; | |
1363 | nand_chip->ecc.bytes = 4; | |
1364 | nand_chip->ecc.strength = 1; | |
1365 | ||
1366 | return 0; | |
1367 | } | |
1368 | ||
42cb1403 AV |
1369 | /* |
1370 | * Probe for the NAND device. | |
1371 | */ | |
3c3796cc | 1372 | static int __init atmel_nand_probe(struct platform_device *pdev) |
42cb1403 | 1373 | { |
3c3796cc | 1374 | struct atmel_nand_host *host; |
42cb1403 AV |
1375 | struct mtd_info *mtd; |
1376 | struct nand_chip *nand_chip; | |
77f5492c | 1377 | struct resource *mem; |
d6a01661 | 1378 | struct mtd_part_parser_data ppdata = {}; |
42cb1403 | 1379 | int res; |
251e783a | 1380 | struct pinctrl *pinctrl; |
42cb1403 | 1381 | |
cc0c72e1 HS |
1382 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
1383 | if (!mem) { | |
1384 | printk(KERN_ERR "atmel_nand: can't get I/O resource mem\n"); | |
1385 | return -ENXIO; | |
1386 | } | |
1387 | ||
42cb1403 | 1388 | /* Allocate memory for the device structure (and zero it) */ |
3c3796cc | 1389 | host = kzalloc(sizeof(struct atmel_nand_host), GFP_KERNEL); |
42cb1403 | 1390 | if (!host) { |
3c3796cc | 1391 | printk(KERN_ERR "atmel_nand: failed to allocate device structure.\n"); |
42cb1403 AV |
1392 | return -ENOMEM; |
1393 | } | |
1394 | ||
cbc6c5e7 HX |
1395 | host->io_phys = (dma_addr_t)mem->start; |
1396 | ||
28f65c11 | 1397 | host->io_base = ioremap(mem->start, resource_size(mem)); |
42cb1403 | 1398 | if (host->io_base == NULL) { |
3c3796cc | 1399 | printk(KERN_ERR "atmel_nand: ioremap failed\n"); |
cc0c72e1 HS |
1400 | res = -EIO; |
1401 | goto err_nand_ioremap; | |
42cb1403 AV |
1402 | } |
1403 | ||
1404 | mtd = &host->mtd; | |
1405 | nand_chip = &host->nand_chip; | |
77f5492c | 1406 | host->dev = &pdev->dev; |
d6a01661 JCPV |
1407 | if (pdev->dev.of_node) { |
1408 | res = atmel_of_init_port(host, pdev->dev.of_node); | |
1409 | if (res) | |
28446acb | 1410 | goto err_ecc_ioremap; |
d6a01661 JCPV |
1411 | } else { |
1412 | memcpy(&host->board, pdev->dev.platform_data, | |
1413 | sizeof(struct atmel_nand_data)); | |
1414 | } | |
42cb1403 AV |
1415 | |
1416 | nand_chip->priv = host; /* link the private data structures */ | |
1417 | mtd->priv = nand_chip; | |
1418 | mtd->owner = THIS_MODULE; | |
1419 | ||
1420 | /* Set address of NAND IO lines */ | |
1421 | nand_chip->IO_ADDR_R = host->io_base; | |
1422 | nand_chip->IO_ADDR_W = host->io_base; | |
3c3796cc | 1423 | nand_chip->cmd_ctrl = atmel_nand_cmd_ctrl; |
a4265f8d | 1424 | |
251e783a JCPV |
1425 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
1426 | if (IS_ERR(pinctrl)) { | |
1427 | dev_err(host->dev, "Failed to request pinctrl\n"); | |
1428 | res = PTR_ERR(pinctrl); | |
1429 | goto err_ecc_ioremap; | |
1430 | } | |
1431 | ||
28446acb JCPV |
1432 | if (gpio_is_valid(host->board.rdy_pin)) { |
1433 | res = gpio_request(host->board.rdy_pin, "nand_rdy"); | |
1434 | if (res < 0) { | |
1435 | dev_err(&pdev->dev, | |
1436 | "can't request rdy gpio %d\n", | |
1437 | host->board.rdy_pin); | |
1438 | goto err_ecc_ioremap; | |
1439 | } | |
1440 | ||
1441 | res = gpio_direction_input(host->board.rdy_pin); | |
1442 | if (res < 0) { | |
1443 | dev_err(&pdev->dev, | |
1444 | "can't request input direction rdy gpio %d\n", | |
1445 | host->board.rdy_pin); | |
1446 | goto err_ecc_ioremap; | |
1447 | } | |
1448 | ||
3c3796cc | 1449 | nand_chip->dev_ready = atmel_nand_device_ready; |
28446acb JCPV |
1450 | } |
1451 | ||
1452 | if (gpio_is_valid(host->board.enable_pin)) { | |
1453 | res = gpio_request(host->board.enable_pin, "nand_enable"); | |
1454 | if (res < 0) { | |
1455 | dev_err(&pdev->dev, | |
1456 | "can't request enable gpio %d\n", | |
1457 | host->board.enable_pin); | |
1458 | goto err_ecc_ioremap; | |
1459 | } | |
1460 | ||
1461 | res = gpio_direction_output(host->board.enable_pin, 1); | |
1462 | if (res < 0) { | |
1463 | dev_err(&pdev->dev, | |
1464 | "can't request output direction enable gpio %d\n", | |
1465 | host->board.enable_pin); | |
1466 | goto err_ecc_ioremap; | |
1467 | } | |
1468 | } | |
a4265f8d | 1469 | |
d6a01661 | 1470 | nand_chip->ecc.mode = host->board.ecc_mode; |
42cb1403 AV |
1471 | nand_chip->chip_delay = 20; /* 20us command delay time */ |
1472 | ||
d6a01661 | 1473 | if (host->board.bus_width_16) /* 16-bit bus width */ |
dd11b8cd | 1474 | nand_chip->options |= NAND_BUSWIDTH_16; |
cbc6c5e7 HX |
1475 | |
1476 | nand_chip->read_buf = atmel_read_buf; | |
1477 | nand_chip->write_buf = atmel_write_buf; | |
dd11b8cd | 1478 | |
42cb1403 | 1479 | platform_set_drvdata(pdev, host); |
3c3796cc | 1480 | atmel_nand_enable(host); |
42cb1403 | 1481 | |
d6a01661 | 1482 | if (gpio_is_valid(host->board.det_pin)) { |
28446acb JCPV |
1483 | res = gpio_request(host->board.det_pin, "nand_det"); |
1484 | if (res < 0) { | |
1485 | dev_err(&pdev->dev, | |
1486 | "can't request det gpio %d\n", | |
1487 | host->board.det_pin); | |
1488 | goto err_no_card; | |
1489 | } | |
1490 | ||
1491 | res = gpio_direction_input(host->board.det_pin); | |
1492 | if (res < 0) { | |
1493 | dev_err(&pdev->dev, | |
1494 | "can't request input direction det gpio %d\n", | |
1495 | host->board.det_pin); | |
1496 | goto err_no_card; | |
1497 | } | |
1498 | ||
d6a01661 | 1499 | if (gpio_get_value(host->board.det_pin)) { |
f4fa697c | 1500 | printk(KERN_INFO "No SmartMedia card inserted.\n"); |
895fb494 | 1501 | res = -ENXIO; |
cc0c72e1 | 1502 | goto err_no_card; |
42cb1403 AV |
1503 | } |
1504 | } | |
1505 | ||
d6a01661 | 1506 | if (host->board.on_flash_bbt || on_flash_bbt) { |
f4fa697c | 1507 | printk(KERN_INFO "atmel_nand: Use On Flash BBT\n"); |
bb9ebd4e | 1508 | nand_chip->bbt_options |= NAND_BBT_USE_FLASH; |
f4fa697c SP |
1509 | } |
1510 | ||
cb457a4d HX |
1511 | if (!cpu_has_dma()) |
1512 | use_dma = 0; | |
1513 | ||
1514 | if (use_dma) { | |
cbc6c5e7 HX |
1515 | dma_cap_mask_t mask; |
1516 | ||
1517 | dma_cap_zero(mask); | |
1518 | dma_cap_set(DMA_MEMCPY, mask); | |
201ab536 | 1519 | host->dma_chan = dma_request_channel(mask, NULL, NULL); |
cbc6c5e7 HX |
1520 | if (!host->dma_chan) { |
1521 | dev_err(host->dev, "Failed to request DMA channel\n"); | |
1522 | use_dma = 0; | |
1523 | } | |
1524 | } | |
1525 | if (use_dma) | |
042bc9c0 NF |
1526 | dev_info(host->dev, "Using %s for DMA transfers.\n", |
1527 | dma_chan_name(host->dma_chan)); | |
cbc6c5e7 HX |
1528 | else |
1529 | dev_info(host->dev, "No DMA support for NAND access.\n"); | |
1530 | ||
77f5492c | 1531 | /* first scan to find the device and get the page size */ |
5e81e88a | 1532 | if (nand_scan_ident(mtd, 1, NULL)) { |
77f5492c | 1533 | res = -ENXIO; |
cc0c72e1 | 1534 | goto err_scan_ident; |
77f5492c RG |
1535 | } |
1536 | ||
3fc23898 | 1537 | if (nand_chip->ecc.mode == NAND_ECC_HW) { |
1c7b874d JW |
1538 | if (host->has_pmecc) |
1539 | res = atmel_pmecc_nand_init_params(pdev, host); | |
1540 | else | |
1541 | res = atmel_hw_nand_init_params(pdev, host); | |
1542 | ||
3dfe41a4 JW |
1543 | if (res != 0) |
1544 | goto err_hw_ecc; | |
77f5492c RG |
1545 | } |
1546 | ||
1547 | /* second phase scan */ | |
1548 | if (nand_scan_tail(mtd)) { | |
42cb1403 | 1549 | res = -ENXIO; |
cc0c72e1 | 1550 | goto err_scan_tail; |
42cb1403 AV |
1551 | } |
1552 | ||
3c3796cc | 1553 | mtd->name = "atmel_nand"; |
d6a01661 JCPV |
1554 | ppdata.of_node = pdev->dev.of_node; |
1555 | res = mtd_device_parse_register(mtd, NULL, &ppdata, | |
1556 | host->board.parts, host->board.num_parts); | |
42cb1403 AV |
1557 | if (!res) |
1558 | return res; | |
1559 | ||
cc0c72e1 | 1560 | err_scan_tail: |
1c7b874d JW |
1561 | if (host->has_pmecc && host->nand_chip.ecc.mode == NAND_ECC_HW) { |
1562 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE); | |
1563 | pmecc_data_free(host); | |
1564 | } | |
3dfe41a4 JW |
1565 | if (host->ecc) |
1566 | iounmap(host->ecc); | |
1c7b874d JW |
1567 | if (host->pmerrloc_base) |
1568 | iounmap(host->pmerrloc_base); | |
1569 | if (host->pmecc_rom_base) | |
1570 | iounmap(host->pmecc_rom_base); | |
3dfe41a4 | 1571 | err_hw_ecc: |
cc0c72e1 HS |
1572 | err_scan_ident: |
1573 | err_no_card: | |
3c3796cc | 1574 | atmel_nand_disable(host); |
42cb1403 | 1575 | platform_set_drvdata(pdev, NULL); |
cbc6c5e7 HX |
1576 | if (host->dma_chan) |
1577 | dma_release_channel(host->dma_chan); | |
28446acb | 1578 | err_ecc_ioremap: |
42cb1403 | 1579 | iounmap(host->io_base); |
cc0c72e1 | 1580 | err_nand_ioremap: |
42cb1403 AV |
1581 | kfree(host); |
1582 | return res; | |
1583 | } | |
1584 | ||
1585 | /* | |
1586 | * Remove a NAND device. | |
1587 | */ | |
23a346ca | 1588 | static int __exit atmel_nand_remove(struct platform_device *pdev) |
42cb1403 | 1589 | { |
3c3796cc | 1590 | struct atmel_nand_host *host = platform_get_drvdata(pdev); |
42cb1403 AV |
1591 | struct mtd_info *mtd = &host->mtd; |
1592 | ||
1593 | nand_release(mtd); | |
1594 | ||
3c3796cc | 1595 | atmel_nand_disable(host); |
42cb1403 | 1596 | |
1c7b874d JW |
1597 | if (host->has_pmecc && host->nand_chip.ecc.mode == NAND_ECC_HW) { |
1598 | pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE); | |
1599 | pmerrloc_writel(host->pmerrloc_base, ELDIS, | |
1600 | PMERRLOC_DISABLE); | |
1601 | pmecc_data_free(host); | |
1602 | } | |
1603 | ||
28446acb JCPV |
1604 | if (gpio_is_valid(host->board.det_pin)) |
1605 | gpio_free(host->board.det_pin); | |
1606 | ||
1607 | if (gpio_is_valid(host->board.enable_pin)) | |
1608 | gpio_free(host->board.enable_pin); | |
1609 | ||
1610 | if (gpio_is_valid(host->board.rdy_pin)) | |
1611 | gpio_free(host->board.rdy_pin); | |
1612 | ||
cc0c72e1 HS |
1613 | if (host->ecc) |
1614 | iounmap(host->ecc); | |
1c7b874d JW |
1615 | if (host->pmecc_rom_base) |
1616 | iounmap(host->pmecc_rom_base); | |
1617 | if (host->pmerrloc_base) | |
1618 | iounmap(host->pmerrloc_base); | |
cbc6c5e7 HX |
1619 | |
1620 | if (host->dma_chan) | |
1621 | dma_release_channel(host->dma_chan); | |
1622 | ||
42cb1403 AV |
1623 | iounmap(host->io_base); |
1624 | kfree(host); | |
1625 | ||
1626 | return 0; | |
1627 | } | |
1628 | ||
d6a01661 JCPV |
1629 | #if defined(CONFIG_OF) |
1630 | static const struct of_device_id atmel_nand_dt_ids[] = { | |
1631 | { .compatible = "atmel,at91rm9200-nand" }, | |
1632 | { /* sentinel */ } | |
1633 | }; | |
1634 | ||
1635 | MODULE_DEVICE_TABLE(of, atmel_nand_dt_ids); | |
1636 | #endif | |
1637 | ||
3c3796cc | 1638 | static struct platform_driver atmel_nand_driver = { |
23a346ca | 1639 | .remove = __exit_p(atmel_nand_remove), |
42cb1403 | 1640 | .driver = { |
3c3796cc | 1641 | .name = "atmel_nand", |
42cb1403 | 1642 | .owner = THIS_MODULE, |
d6a01661 | 1643 | .of_match_table = of_match_ptr(atmel_nand_dt_ids), |
42cb1403 AV |
1644 | }, |
1645 | }; | |
1646 | ||
3c3796cc | 1647 | static int __init atmel_nand_init(void) |
42cb1403 | 1648 | { |
23a346ca | 1649 | return platform_driver_probe(&atmel_nand_driver, atmel_nand_probe); |
42cb1403 AV |
1650 | } |
1651 | ||
1652 | ||
3c3796cc | 1653 | static void __exit atmel_nand_exit(void) |
42cb1403 | 1654 | { |
3c3796cc | 1655 | platform_driver_unregister(&atmel_nand_driver); |
42cb1403 AV |
1656 | } |
1657 | ||
1658 | ||
3c3796cc HS |
1659 | module_init(atmel_nand_init); |
1660 | module_exit(atmel_nand_exit); | |
42cb1403 AV |
1661 | |
1662 | MODULE_LICENSE("GPL"); | |
1663 | MODULE_AUTHOR("Rick Bronson"); | |
d4f4c0aa | 1664 | MODULE_DESCRIPTION("NAND/SmartMedia driver for AT91 / AVR32"); |
3c3796cc | 1665 | MODULE_ALIAS("platform:atmel_nand"); |