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67ce04bf VS |
1 | /* |
2 | * Copyright © 2004 Texas Instruments, Jian Zhang <jzhang@ti.com> | |
3 | * Copyright © 2004 Micron Technology Inc. | |
4 | * Copyright © 2004 David Brownell | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/platform_device.h> | |
12 | #include <linux/dma-mapping.h> | |
13 | #include <linux/delay.h> | |
a0e5cc58 | 14 | #include <linux/module.h> |
4e070376 | 15 | #include <linux/interrupt.h> |
c276aca4 | 16 | #include <linux/jiffies.h> |
17 | #include <linux/sched.h> | |
67ce04bf VS |
18 | #include <linux/mtd/mtd.h> |
19 | #include <linux/mtd/nand.h> | |
20 | #include <linux/mtd/partitions.h> | |
21 | #include <linux/io.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
67ce04bf | 23 | |
ce491cf8 TL |
24 | #include <plat/dma.h> |
25 | #include <plat/gpmc.h> | |
26 | #include <plat/nand.h> | |
67ce04bf | 27 | |
67ce04bf | 28 | #define DRIVER_NAME "omap2-nand" |
4e070376 | 29 | #define OMAP_NAND_TIMEOUT_MS 5000 |
67ce04bf | 30 | |
67ce04bf VS |
31 | #define NAND_Ecc_P1e (1 << 0) |
32 | #define NAND_Ecc_P2e (1 << 1) | |
33 | #define NAND_Ecc_P4e (1 << 2) | |
34 | #define NAND_Ecc_P8e (1 << 3) | |
35 | #define NAND_Ecc_P16e (1 << 4) | |
36 | #define NAND_Ecc_P32e (1 << 5) | |
37 | #define NAND_Ecc_P64e (1 << 6) | |
38 | #define NAND_Ecc_P128e (1 << 7) | |
39 | #define NAND_Ecc_P256e (1 << 8) | |
40 | #define NAND_Ecc_P512e (1 << 9) | |
41 | #define NAND_Ecc_P1024e (1 << 10) | |
42 | #define NAND_Ecc_P2048e (1 << 11) | |
43 | ||
44 | #define NAND_Ecc_P1o (1 << 16) | |
45 | #define NAND_Ecc_P2o (1 << 17) | |
46 | #define NAND_Ecc_P4o (1 << 18) | |
47 | #define NAND_Ecc_P8o (1 << 19) | |
48 | #define NAND_Ecc_P16o (1 << 20) | |
49 | #define NAND_Ecc_P32o (1 << 21) | |
50 | #define NAND_Ecc_P64o (1 << 22) | |
51 | #define NAND_Ecc_P128o (1 << 23) | |
52 | #define NAND_Ecc_P256o (1 << 24) | |
53 | #define NAND_Ecc_P512o (1 << 25) | |
54 | #define NAND_Ecc_P1024o (1 << 26) | |
55 | #define NAND_Ecc_P2048o (1 << 27) | |
56 | ||
57 | #define TF(value) (value ? 1 : 0) | |
58 | ||
59 | #define P2048e(a) (TF(a & NAND_Ecc_P2048e) << 0) | |
60 | #define P2048o(a) (TF(a & NAND_Ecc_P2048o) << 1) | |
61 | #define P1e(a) (TF(a & NAND_Ecc_P1e) << 2) | |
62 | #define P1o(a) (TF(a & NAND_Ecc_P1o) << 3) | |
63 | #define P2e(a) (TF(a & NAND_Ecc_P2e) << 4) | |
64 | #define P2o(a) (TF(a & NAND_Ecc_P2o) << 5) | |
65 | #define P4e(a) (TF(a & NAND_Ecc_P4e) << 6) | |
66 | #define P4o(a) (TF(a & NAND_Ecc_P4o) << 7) | |
67 | ||
68 | #define P8e(a) (TF(a & NAND_Ecc_P8e) << 0) | |
69 | #define P8o(a) (TF(a & NAND_Ecc_P8o) << 1) | |
70 | #define P16e(a) (TF(a & NAND_Ecc_P16e) << 2) | |
71 | #define P16o(a) (TF(a & NAND_Ecc_P16o) << 3) | |
72 | #define P32e(a) (TF(a & NAND_Ecc_P32e) << 4) | |
73 | #define P32o(a) (TF(a & NAND_Ecc_P32o) << 5) | |
74 | #define P64e(a) (TF(a & NAND_Ecc_P64e) << 6) | |
75 | #define P64o(a) (TF(a & NAND_Ecc_P64o) << 7) | |
76 | ||
77 | #define P128e(a) (TF(a & NAND_Ecc_P128e) << 0) | |
78 | #define P128o(a) (TF(a & NAND_Ecc_P128o) << 1) | |
79 | #define P256e(a) (TF(a & NAND_Ecc_P256e) << 2) | |
80 | #define P256o(a) (TF(a & NAND_Ecc_P256o) << 3) | |
81 | #define P512e(a) (TF(a & NAND_Ecc_P512e) << 4) | |
82 | #define P512o(a) (TF(a & NAND_Ecc_P512o) << 5) | |
83 | #define P1024e(a) (TF(a & NAND_Ecc_P1024e) << 6) | |
84 | #define P1024o(a) (TF(a & NAND_Ecc_P1024o) << 7) | |
85 | ||
86 | #define P8e_s(a) (TF(a & NAND_Ecc_P8e) << 0) | |
87 | #define P8o_s(a) (TF(a & NAND_Ecc_P8o) << 1) | |
88 | #define P16e_s(a) (TF(a & NAND_Ecc_P16e) << 2) | |
89 | #define P16o_s(a) (TF(a & NAND_Ecc_P16o) << 3) | |
90 | #define P1e_s(a) (TF(a & NAND_Ecc_P1e) << 4) | |
91 | #define P1o_s(a) (TF(a & NAND_Ecc_P1o) << 5) | |
92 | #define P2e_s(a) (TF(a & NAND_Ecc_P2e) << 6) | |
93 | #define P2o_s(a) (TF(a & NAND_Ecc_P2o) << 7) | |
94 | ||
95 | #define P4e_s(a) (TF(a & NAND_Ecc_P4e) << 0) | |
96 | #define P4o_s(a) (TF(a & NAND_Ecc_P4o) << 1) | |
97 | ||
f040d332 SG |
98 | /* oob info generated runtime depending on ecc algorithm and layout selected */ |
99 | static struct nand_ecclayout omap_oobinfo; | |
100 | /* Define some generic bad / good block scan pattern which are used | |
101 | * while scanning a device for factory marked good / bad blocks | |
102 | */ | |
103 | static uint8_t scan_ff_pattern[] = { 0xff }; | |
104 | static struct nand_bbt_descr bb_descrip_flashbased = { | |
105 | .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, | |
106 | .offs = 0, | |
107 | .len = 1, | |
108 | .pattern = scan_ff_pattern, | |
109 | }; | |
dfe32893 | 110 | |
59e9c5ae | 111 | |
67ce04bf VS |
112 | struct omap_nand_info { |
113 | struct nand_hw_control controller; | |
114 | struct omap_nand_platform_data *pdata; | |
115 | struct mtd_info mtd; | |
67ce04bf VS |
116 | struct nand_chip nand; |
117 | struct platform_device *pdev; | |
118 | ||
119 | int gpmc_cs; | |
120 | unsigned long phys_base; | |
dfe32893 | 121 | struct completion comp; |
122 | int dma_ch; | |
4e070376 SG |
123 | int gpmc_irq; |
124 | enum { | |
125 | OMAP_NAND_IO_READ = 0, /* read */ | |
126 | OMAP_NAND_IO_WRITE, /* write */ | |
127 | } iomode; | |
128 | u_char *buf; | |
129 | int buf_len; | |
67ce04bf VS |
130 | }; |
131 | ||
67ce04bf VS |
132 | /** |
133 | * omap_hwcontrol - hardware specific access to control-lines | |
134 | * @mtd: MTD device structure | |
135 | * @cmd: command to device | |
136 | * @ctrl: | |
137 | * NAND_NCE: bit 0 -> don't care | |
138 | * NAND_CLE: bit 1 -> Command Latch | |
139 | * NAND_ALE: bit 2 -> Address Latch | |
140 | * | |
141 | * NOTE: boards may use different bits for these!! | |
142 | */ | |
143 | static void omap_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) | |
144 | { | |
145 | struct omap_nand_info *info = container_of(mtd, | |
146 | struct omap_nand_info, mtd); | |
67ce04bf | 147 | |
2c01946c SG |
148 | if (cmd != NAND_CMD_NONE) { |
149 | if (ctrl & NAND_CLE) | |
150 | gpmc_nand_write(info->gpmc_cs, GPMC_NAND_COMMAND, cmd); | |
151 | ||
152 | else if (ctrl & NAND_ALE) | |
153 | gpmc_nand_write(info->gpmc_cs, GPMC_NAND_ADDRESS, cmd); | |
154 | ||
155 | else /* NAND_NCE */ | |
156 | gpmc_nand_write(info->gpmc_cs, GPMC_NAND_DATA, cmd); | |
157 | } | |
67ce04bf VS |
158 | } |
159 | ||
59e9c5ae | 160 | /** |
161 | * omap_read_buf8 - read data from NAND controller into buffer | |
162 | * @mtd: MTD device structure | |
163 | * @buf: buffer to store date | |
164 | * @len: number of bytes to read | |
165 | */ | |
166 | static void omap_read_buf8(struct mtd_info *mtd, u_char *buf, int len) | |
167 | { | |
168 | struct nand_chip *nand = mtd->priv; | |
169 | ||
170 | ioread8_rep(nand->IO_ADDR_R, buf, len); | |
171 | } | |
172 | ||
173 | /** | |
174 | * omap_write_buf8 - write buffer to NAND controller | |
175 | * @mtd: MTD device structure | |
176 | * @buf: data buffer | |
177 | * @len: number of bytes to write | |
178 | */ | |
179 | static void omap_write_buf8(struct mtd_info *mtd, const u_char *buf, int len) | |
180 | { | |
181 | struct omap_nand_info *info = container_of(mtd, | |
182 | struct omap_nand_info, mtd); | |
183 | u_char *p = (u_char *)buf; | |
2c01946c | 184 | u32 status = 0; |
59e9c5ae | 185 | |
186 | while (len--) { | |
187 | iowrite8(*p++, info->nand.IO_ADDR_W); | |
2c01946c SG |
188 | /* wait until buffer is available for write */ |
189 | do { | |
190 | status = gpmc_read_status(GPMC_STATUS_BUFFER); | |
191 | } while (!status); | |
59e9c5ae | 192 | } |
193 | } | |
194 | ||
67ce04bf VS |
195 | /** |
196 | * omap_read_buf16 - read data from NAND controller into buffer | |
197 | * @mtd: MTD device structure | |
198 | * @buf: buffer to store date | |
199 | * @len: number of bytes to read | |
200 | */ | |
201 | static void omap_read_buf16(struct mtd_info *mtd, u_char *buf, int len) | |
202 | { | |
203 | struct nand_chip *nand = mtd->priv; | |
204 | ||
59e9c5ae | 205 | ioread16_rep(nand->IO_ADDR_R, buf, len / 2); |
67ce04bf VS |
206 | } |
207 | ||
208 | /** | |
209 | * omap_write_buf16 - write buffer to NAND controller | |
210 | * @mtd: MTD device structure | |
211 | * @buf: data buffer | |
212 | * @len: number of bytes to write | |
213 | */ | |
214 | static void omap_write_buf16(struct mtd_info *mtd, const u_char * buf, int len) | |
215 | { | |
216 | struct omap_nand_info *info = container_of(mtd, | |
217 | struct omap_nand_info, mtd); | |
218 | u16 *p = (u16 *) buf; | |
2c01946c | 219 | u32 status = 0; |
67ce04bf VS |
220 | /* FIXME try bursts of writesw() or DMA ... */ |
221 | len >>= 1; | |
222 | ||
223 | while (len--) { | |
59e9c5ae | 224 | iowrite16(*p++, info->nand.IO_ADDR_W); |
2c01946c SG |
225 | /* wait until buffer is available for write */ |
226 | do { | |
227 | status = gpmc_read_status(GPMC_STATUS_BUFFER); | |
228 | } while (!status); | |
67ce04bf VS |
229 | } |
230 | } | |
59e9c5ae | 231 | |
232 | /** | |
233 | * omap_read_buf_pref - read data from NAND controller into buffer | |
234 | * @mtd: MTD device structure | |
235 | * @buf: buffer to store date | |
236 | * @len: number of bytes to read | |
237 | */ | |
238 | static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len) | |
239 | { | |
240 | struct omap_nand_info *info = container_of(mtd, | |
241 | struct omap_nand_info, mtd); | |
2c01946c | 242 | uint32_t r_count = 0; |
59e9c5ae | 243 | int ret = 0; |
244 | u32 *p = (u32 *)buf; | |
245 | ||
246 | /* take care of subpage reads */ | |
c3341d0c VS |
247 | if (len % 4) { |
248 | if (info->nand.options & NAND_BUSWIDTH_16) | |
249 | omap_read_buf16(mtd, buf, len % 4); | |
250 | else | |
251 | omap_read_buf8(mtd, buf, len % 4); | |
252 | p = (u32 *) (buf + len % 4); | |
253 | len -= len % 4; | |
59e9c5ae | 254 | } |
59e9c5ae | 255 | |
256 | /* configure and start prefetch transfer */ | |
317379a9 SG |
257 | ret = gpmc_prefetch_enable(info->gpmc_cs, |
258 | PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x0); | |
59e9c5ae | 259 | if (ret) { |
260 | /* PFPW engine is busy, use cpu copy method */ | |
261 | if (info->nand.options & NAND_BUSWIDTH_16) | |
c5d8c0ca | 262 | omap_read_buf16(mtd, (u_char *)p, len); |
59e9c5ae | 263 | else |
c5d8c0ca | 264 | omap_read_buf8(mtd, (u_char *)p, len); |
59e9c5ae | 265 | } else { |
266 | do { | |
2c01946c SG |
267 | r_count = gpmc_read_status(GPMC_PREFETCH_FIFO_CNT); |
268 | r_count = r_count >> 2; | |
269 | ioread32_rep(info->nand.IO_ADDR_R, p, r_count); | |
59e9c5ae | 270 | p += r_count; |
271 | len -= r_count << 2; | |
272 | } while (len); | |
59e9c5ae | 273 | /* disable and stop the PFPW engine */ |
948d38e7 | 274 | gpmc_prefetch_reset(info->gpmc_cs); |
59e9c5ae | 275 | } |
276 | } | |
277 | ||
278 | /** | |
279 | * omap_write_buf_pref - write buffer to NAND controller | |
280 | * @mtd: MTD device structure | |
281 | * @buf: data buffer | |
282 | * @len: number of bytes to write | |
283 | */ | |
284 | static void omap_write_buf_pref(struct mtd_info *mtd, | |
285 | const u_char *buf, int len) | |
286 | { | |
287 | struct omap_nand_info *info = container_of(mtd, | |
288 | struct omap_nand_info, mtd); | |
4e070376 | 289 | uint32_t w_count = 0; |
59e9c5ae | 290 | int i = 0, ret = 0; |
c5d8c0ca | 291 | u16 *p = (u16 *)buf; |
4e070376 | 292 | unsigned long tim, limit; |
59e9c5ae | 293 | |
294 | /* take care of subpage writes */ | |
295 | if (len % 2 != 0) { | |
2c01946c | 296 | writeb(*buf, info->nand.IO_ADDR_W); |
59e9c5ae | 297 | p = (u16 *)(buf + 1); |
298 | len--; | |
299 | } | |
300 | ||
301 | /* configure and start prefetch transfer */ | |
317379a9 SG |
302 | ret = gpmc_prefetch_enable(info->gpmc_cs, |
303 | PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x1); | |
59e9c5ae | 304 | if (ret) { |
305 | /* PFPW engine is busy, use cpu copy method */ | |
306 | if (info->nand.options & NAND_BUSWIDTH_16) | |
c5d8c0ca | 307 | omap_write_buf16(mtd, (u_char *)p, len); |
59e9c5ae | 308 | else |
c5d8c0ca | 309 | omap_write_buf8(mtd, (u_char *)p, len); |
59e9c5ae | 310 | } else { |
2c01946c SG |
311 | while (len) { |
312 | w_count = gpmc_read_status(GPMC_PREFETCH_FIFO_CNT); | |
313 | w_count = w_count >> 1; | |
59e9c5ae | 314 | for (i = 0; (i < w_count) && len; i++, len -= 2) |
2c01946c | 315 | iowrite16(*p++, info->nand.IO_ADDR_W); |
59e9c5ae | 316 | } |
2c01946c | 317 | /* wait for data to flushed-out before reset the prefetch */ |
4e070376 SG |
318 | tim = 0; |
319 | limit = (loops_per_jiffy * | |
320 | msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS)); | |
321 | while (gpmc_read_status(GPMC_PREFETCH_COUNT) && (tim++ < limit)) | |
322 | cpu_relax(); | |
323 | ||
59e9c5ae | 324 | /* disable and stop the PFPW engine */ |
948d38e7 | 325 | gpmc_prefetch_reset(info->gpmc_cs); |
59e9c5ae | 326 | } |
327 | } | |
328 | ||
dfe32893 | 329 | /* |
330 | * omap_nand_dma_cb: callback on the completion of dma transfer | |
331 | * @lch: logical channel | |
332 | * @ch_satuts: channel status | |
333 | * @data: pointer to completion data structure | |
334 | */ | |
335 | static void omap_nand_dma_cb(int lch, u16 ch_status, void *data) | |
336 | { | |
337 | complete((struct completion *) data); | |
338 | } | |
339 | ||
340 | /* | |
341 | * omap_nand_dma_transfer: configer and start dma transfer | |
342 | * @mtd: MTD device structure | |
343 | * @addr: virtual address in RAM of source/destination | |
344 | * @len: number of data bytes to be transferred | |
345 | * @is_write: flag for read/write operation | |
346 | */ | |
347 | static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr, | |
348 | unsigned int len, int is_write) | |
349 | { | |
350 | struct omap_nand_info *info = container_of(mtd, | |
351 | struct omap_nand_info, mtd); | |
dfe32893 | 352 | enum dma_data_direction dir = is_write ? DMA_TO_DEVICE : |
353 | DMA_FROM_DEVICE; | |
354 | dma_addr_t dma_addr; | |
355 | int ret; | |
4e070376 | 356 | unsigned long tim, limit; |
dfe32893 | 357 | |
317379a9 SG |
358 | /* The fifo depth is 64 bytes max. |
359 | * But configure the FIFO-threahold to 32 to get a sync at each frame | |
360 | * and frame length is 32 bytes. | |
dfe32893 | 361 | */ |
362 | int buf_len = len >> 6; | |
363 | ||
364 | if (addr >= high_memory) { | |
365 | struct page *p1; | |
366 | ||
367 | if (((size_t)addr & PAGE_MASK) != | |
368 | ((size_t)(addr + len - 1) & PAGE_MASK)) | |
369 | goto out_copy; | |
370 | p1 = vmalloc_to_page(addr); | |
371 | if (!p1) | |
372 | goto out_copy; | |
373 | addr = page_address(p1) + ((size_t)addr & ~PAGE_MASK); | |
374 | } | |
375 | ||
376 | dma_addr = dma_map_single(&info->pdev->dev, addr, len, dir); | |
377 | if (dma_mapping_error(&info->pdev->dev, dma_addr)) { | |
378 | dev_err(&info->pdev->dev, | |
379 | "Couldn't DMA map a %d byte buffer\n", len); | |
380 | goto out_copy; | |
381 | } | |
382 | ||
383 | if (is_write) { | |
384 | omap_set_dma_dest_params(info->dma_ch, 0, OMAP_DMA_AMODE_CONSTANT, | |
385 | info->phys_base, 0, 0); | |
386 | omap_set_dma_src_params(info->dma_ch, 0, OMAP_DMA_AMODE_POST_INC, | |
387 | dma_addr, 0, 0); | |
388 | omap_set_dma_transfer_params(info->dma_ch, OMAP_DMA_DATA_TYPE_S32, | |
389 | 0x10, buf_len, OMAP_DMA_SYNC_FRAME, | |
390 | OMAP24XX_DMA_GPMC, OMAP_DMA_DST_SYNC); | |
391 | } else { | |
392 | omap_set_dma_src_params(info->dma_ch, 0, OMAP_DMA_AMODE_CONSTANT, | |
393 | info->phys_base, 0, 0); | |
394 | omap_set_dma_dest_params(info->dma_ch, 0, OMAP_DMA_AMODE_POST_INC, | |
395 | dma_addr, 0, 0); | |
396 | omap_set_dma_transfer_params(info->dma_ch, OMAP_DMA_DATA_TYPE_S32, | |
397 | 0x10, buf_len, OMAP_DMA_SYNC_FRAME, | |
398 | OMAP24XX_DMA_GPMC, OMAP_DMA_SRC_SYNC); | |
399 | } | |
400 | /* configure and start prefetch transfer */ | |
317379a9 SG |
401 | ret = gpmc_prefetch_enable(info->gpmc_cs, |
402 | PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write); | |
dfe32893 | 403 | if (ret) |
4e070376 | 404 | /* PFPW engine is busy, use cpu copy method */ |
dfe32893 | 405 | goto out_copy; |
406 | ||
407 | init_completion(&info->comp); | |
408 | ||
409 | omap_start_dma(info->dma_ch); | |
410 | ||
411 | /* setup and start DMA using dma_addr */ | |
412 | wait_for_completion(&info->comp); | |
4e070376 SG |
413 | tim = 0; |
414 | limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS)); | |
415 | while (gpmc_read_status(GPMC_PREFETCH_COUNT) && (tim++ < limit)) | |
416 | cpu_relax(); | |
dfe32893 | 417 | |
dfe32893 | 418 | /* disable and stop the PFPW engine */ |
f12f662f | 419 | gpmc_prefetch_reset(info->gpmc_cs); |
dfe32893 | 420 | |
421 | dma_unmap_single(&info->pdev->dev, dma_addr, len, dir); | |
422 | return 0; | |
423 | ||
424 | out_copy: | |
425 | if (info->nand.options & NAND_BUSWIDTH_16) | |
426 | is_write == 0 ? omap_read_buf16(mtd, (u_char *) addr, len) | |
427 | : omap_write_buf16(mtd, (u_char *) addr, len); | |
428 | else | |
429 | is_write == 0 ? omap_read_buf8(mtd, (u_char *) addr, len) | |
430 | : omap_write_buf8(mtd, (u_char *) addr, len); | |
431 | return 0; | |
432 | } | |
dfe32893 | 433 | |
434 | /** | |
435 | * omap_read_buf_dma_pref - read data from NAND controller into buffer | |
436 | * @mtd: MTD device structure | |
437 | * @buf: buffer to store date | |
438 | * @len: number of bytes to read | |
439 | */ | |
440 | static void omap_read_buf_dma_pref(struct mtd_info *mtd, u_char *buf, int len) | |
441 | { | |
442 | if (len <= mtd->oobsize) | |
443 | omap_read_buf_pref(mtd, buf, len); | |
444 | else | |
445 | /* start transfer in DMA mode */ | |
446 | omap_nand_dma_transfer(mtd, buf, len, 0x0); | |
447 | } | |
448 | ||
449 | /** | |
450 | * omap_write_buf_dma_pref - write buffer to NAND controller | |
451 | * @mtd: MTD device structure | |
452 | * @buf: data buffer | |
453 | * @len: number of bytes to write | |
454 | */ | |
455 | static void omap_write_buf_dma_pref(struct mtd_info *mtd, | |
456 | const u_char *buf, int len) | |
457 | { | |
458 | if (len <= mtd->oobsize) | |
459 | omap_write_buf_pref(mtd, buf, len); | |
460 | else | |
461 | /* start transfer in DMA mode */ | |
bdaefc41 | 462 | omap_nand_dma_transfer(mtd, (u_char *) buf, len, 0x1); |
dfe32893 | 463 | } |
464 | ||
4e070376 SG |
465 | /* |
466 | * omap_nand_irq - GMPC irq handler | |
467 | * @this_irq: gpmc irq number | |
468 | * @dev: omap_nand_info structure pointer is passed here | |
469 | */ | |
470 | static irqreturn_t omap_nand_irq(int this_irq, void *dev) | |
471 | { | |
472 | struct omap_nand_info *info = (struct omap_nand_info *) dev; | |
473 | u32 bytes; | |
474 | u32 irq_stat; | |
475 | ||
476 | irq_stat = gpmc_read_status(GPMC_GET_IRQ_STATUS); | |
477 | bytes = gpmc_read_status(GPMC_PREFETCH_FIFO_CNT); | |
478 | bytes = bytes & 0xFFFC; /* io in multiple of 4 bytes */ | |
479 | if (info->iomode == OMAP_NAND_IO_WRITE) { /* checks for write io */ | |
480 | if (irq_stat & 0x2) | |
481 | goto done; | |
482 | ||
483 | if (info->buf_len && (info->buf_len < bytes)) | |
484 | bytes = info->buf_len; | |
485 | else if (!info->buf_len) | |
486 | bytes = 0; | |
487 | iowrite32_rep(info->nand.IO_ADDR_W, | |
488 | (u32 *)info->buf, bytes >> 2); | |
489 | info->buf = info->buf + bytes; | |
490 | info->buf_len -= bytes; | |
491 | ||
492 | } else { | |
493 | ioread32_rep(info->nand.IO_ADDR_R, | |
494 | (u32 *)info->buf, bytes >> 2); | |
495 | info->buf = info->buf + bytes; | |
496 | ||
497 | if (irq_stat & 0x2) | |
498 | goto done; | |
499 | } | |
500 | gpmc_cs_configure(info->gpmc_cs, GPMC_SET_IRQ_STATUS, irq_stat); | |
501 | ||
502 | return IRQ_HANDLED; | |
503 | ||
504 | done: | |
505 | complete(&info->comp); | |
506 | /* disable irq */ | |
507 | gpmc_cs_configure(info->gpmc_cs, GPMC_ENABLE_IRQ, 0); | |
508 | ||
509 | /* clear status */ | |
510 | gpmc_cs_configure(info->gpmc_cs, GPMC_SET_IRQ_STATUS, irq_stat); | |
511 | ||
512 | return IRQ_HANDLED; | |
513 | } | |
514 | ||
515 | /* | |
516 | * omap_read_buf_irq_pref - read data from NAND controller into buffer | |
517 | * @mtd: MTD device structure | |
518 | * @buf: buffer to store date | |
519 | * @len: number of bytes to read | |
520 | */ | |
521 | static void omap_read_buf_irq_pref(struct mtd_info *mtd, u_char *buf, int len) | |
522 | { | |
523 | struct omap_nand_info *info = container_of(mtd, | |
524 | struct omap_nand_info, mtd); | |
525 | int ret = 0; | |
526 | ||
527 | if (len <= mtd->oobsize) { | |
528 | omap_read_buf_pref(mtd, buf, len); | |
529 | return; | |
530 | } | |
531 | ||
532 | info->iomode = OMAP_NAND_IO_READ; | |
533 | info->buf = buf; | |
534 | init_completion(&info->comp); | |
535 | ||
536 | /* configure and start prefetch transfer */ | |
317379a9 SG |
537 | ret = gpmc_prefetch_enable(info->gpmc_cs, |
538 | PREFETCH_FIFOTHRESHOLD_MAX/2, 0x0, len, 0x0); | |
4e070376 SG |
539 | if (ret) |
540 | /* PFPW engine is busy, use cpu copy method */ | |
541 | goto out_copy; | |
542 | ||
543 | info->buf_len = len; | |
544 | /* enable irq */ | |
545 | gpmc_cs_configure(info->gpmc_cs, GPMC_ENABLE_IRQ, | |
546 | (GPMC_IRQ_FIFOEVENTENABLE | GPMC_IRQ_COUNT_EVENT)); | |
547 | ||
548 | /* waiting for read to complete */ | |
549 | wait_for_completion(&info->comp); | |
550 | ||
551 | /* disable and stop the PFPW engine */ | |
552 | gpmc_prefetch_reset(info->gpmc_cs); | |
553 | return; | |
554 | ||
555 | out_copy: | |
556 | if (info->nand.options & NAND_BUSWIDTH_16) | |
557 | omap_read_buf16(mtd, buf, len); | |
558 | else | |
559 | omap_read_buf8(mtd, buf, len); | |
560 | } | |
561 | ||
562 | /* | |
563 | * omap_write_buf_irq_pref - write buffer to NAND controller | |
564 | * @mtd: MTD device structure | |
565 | * @buf: data buffer | |
566 | * @len: number of bytes to write | |
567 | */ | |
568 | static void omap_write_buf_irq_pref(struct mtd_info *mtd, | |
569 | const u_char *buf, int len) | |
570 | { | |
571 | struct omap_nand_info *info = container_of(mtd, | |
572 | struct omap_nand_info, mtd); | |
573 | int ret = 0; | |
574 | unsigned long tim, limit; | |
575 | ||
576 | if (len <= mtd->oobsize) { | |
577 | omap_write_buf_pref(mtd, buf, len); | |
578 | return; | |
579 | } | |
580 | ||
581 | info->iomode = OMAP_NAND_IO_WRITE; | |
582 | info->buf = (u_char *) buf; | |
583 | init_completion(&info->comp); | |
584 | ||
317379a9 SG |
585 | /* configure and start prefetch transfer : size=24 */ |
586 | ret = gpmc_prefetch_enable(info->gpmc_cs, | |
587 | (PREFETCH_FIFOTHRESHOLD_MAX * 3) / 8, 0x0, len, 0x1); | |
4e070376 SG |
588 | if (ret) |
589 | /* PFPW engine is busy, use cpu copy method */ | |
590 | goto out_copy; | |
591 | ||
592 | info->buf_len = len; | |
593 | /* enable irq */ | |
594 | gpmc_cs_configure(info->gpmc_cs, GPMC_ENABLE_IRQ, | |
595 | (GPMC_IRQ_FIFOEVENTENABLE | GPMC_IRQ_COUNT_EVENT)); | |
596 | ||
597 | /* waiting for write to complete */ | |
598 | wait_for_completion(&info->comp); | |
599 | /* wait for data to flushed-out before reset the prefetch */ | |
600 | tim = 0; | |
601 | limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS)); | |
602 | while (gpmc_read_status(GPMC_PREFETCH_COUNT) && (tim++ < limit)) | |
603 | cpu_relax(); | |
604 | ||
605 | /* disable and stop the PFPW engine */ | |
606 | gpmc_prefetch_reset(info->gpmc_cs); | |
607 | return; | |
608 | ||
609 | out_copy: | |
610 | if (info->nand.options & NAND_BUSWIDTH_16) | |
611 | omap_write_buf16(mtd, buf, len); | |
612 | else | |
613 | omap_write_buf8(mtd, buf, len); | |
614 | } | |
615 | ||
67ce04bf VS |
616 | /** |
617 | * omap_verify_buf - Verify chip data against buffer | |
618 | * @mtd: MTD device structure | |
619 | * @buf: buffer containing the data to compare | |
620 | * @len: number of bytes to compare | |
621 | */ | |
622 | static int omap_verify_buf(struct mtd_info *mtd, const u_char * buf, int len) | |
623 | { | |
624 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, | |
625 | mtd); | |
626 | u16 *p = (u16 *) buf; | |
627 | ||
628 | len >>= 1; | |
629 | while (len--) { | |
630 | if (*p++ != cpu_to_le16(readw(info->nand.IO_ADDR_R))) | |
631 | return -EFAULT; | |
632 | } | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
67ce04bf VS |
637 | /** |
638 | * gen_true_ecc - This function will generate true ECC value | |
639 | * @ecc_buf: buffer to store ecc code | |
640 | * | |
641 | * This generated true ECC value can be used when correcting | |
642 | * data read from NAND flash memory core | |
643 | */ | |
644 | static void gen_true_ecc(u8 *ecc_buf) | |
645 | { | |
646 | u32 tmp = ecc_buf[0] | (ecc_buf[1] << 16) | | |
647 | ((ecc_buf[2] & 0xF0) << 20) | ((ecc_buf[2] & 0x0F) << 8); | |
648 | ||
649 | ecc_buf[0] = ~(P64o(tmp) | P64e(tmp) | P32o(tmp) | P32e(tmp) | | |
650 | P16o(tmp) | P16e(tmp) | P8o(tmp) | P8e(tmp)); | |
651 | ecc_buf[1] = ~(P1024o(tmp) | P1024e(tmp) | P512o(tmp) | P512e(tmp) | | |
652 | P256o(tmp) | P256e(tmp) | P128o(tmp) | P128e(tmp)); | |
653 | ecc_buf[2] = ~(P4o(tmp) | P4e(tmp) | P2o(tmp) | P2e(tmp) | P1o(tmp) | | |
654 | P1e(tmp) | P2048o(tmp) | P2048e(tmp)); | |
655 | } | |
656 | ||
657 | /** | |
658 | * omap_compare_ecc - Detect (2 bits) and correct (1 bit) error in data | |
659 | * @ecc_data1: ecc code from nand spare area | |
660 | * @ecc_data2: ecc code from hardware register obtained from hardware ecc | |
661 | * @page_data: page data | |
662 | * | |
663 | * This function compares two ECC's and indicates if there is an error. | |
664 | * If the error can be corrected it will be corrected to the buffer. | |
74f1b724 JO |
665 | * If there is no error, %0 is returned. If there is an error but it |
666 | * was corrected, %1 is returned. Otherwise, %-1 is returned. | |
67ce04bf VS |
667 | */ |
668 | static int omap_compare_ecc(u8 *ecc_data1, /* read from NAND memory */ | |
669 | u8 *ecc_data2, /* read from register */ | |
670 | u8 *page_data) | |
671 | { | |
672 | uint i; | |
673 | u8 tmp0_bit[8], tmp1_bit[8], tmp2_bit[8]; | |
674 | u8 comp0_bit[8], comp1_bit[8], comp2_bit[8]; | |
675 | u8 ecc_bit[24]; | |
676 | u8 ecc_sum = 0; | |
677 | u8 find_bit = 0; | |
678 | uint find_byte = 0; | |
679 | int isEccFF; | |
680 | ||
681 | isEccFF = ((*(u32 *)ecc_data1 & 0xFFFFFF) == 0xFFFFFF); | |
682 | ||
683 | gen_true_ecc(ecc_data1); | |
684 | gen_true_ecc(ecc_data2); | |
685 | ||
686 | for (i = 0; i <= 2; i++) { | |
687 | *(ecc_data1 + i) = ~(*(ecc_data1 + i)); | |
688 | *(ecc_data2 + i) = ~(*(ecc_data2 + i)); | |
689 | } | |
690 | ||
691 | for (i = 0; i < 8; i++) { | |
692 | tmp0_bit[i] = *ecc_data1 % 2; | |
693 | *ecc_data1 = *ecc_data1 / 2; | |
694 | } | |
695 | ||
696 | for (i = 0; i < 8; i++) { | |
697 | tmp1_bit[i] = *(ecc_data1 + 1) % 2; | |
698 | *(ecc_data1 + 1) = *(ecc_data1 + 1) / 2; | |
699 | } | |
700 | ||
701 | for (i = 0; i < 8; i++) { | |
702 | tmp2_bit[i] = *(ecc_data1 + 2) % 2; | |
703 | *(ecc_data1 + 2) = *(ecc_data1 + 2) / 2; | |
704 | } | |
705 | ||
706 | for (i = 0; i < 8; i++) { | |
707 | comp0_bit[i] = *ecc_data2 % 2; | |
708 | *ecc_data2 = *ecc_data2 / 2; | |
709 | } | |
710 | ||
711 | for (i = 0; i < 8; i++) { | |
712 | comp1_bit[i] = *(ecc_data2 + 1) % 2; | |
713 | *(ecc_data2 + 1) = *(ecc_data2 + 1) / 2; | |
714 | } | |
715 | ||
716 | for (i = 0; i < 8; i++) { | |
717 | comp2_bit[i] = *(ecc_data2 + 2) % 2; | |
718 | *(ecc_data2 + 2) = *(ecc_data2 + 2) / 2; | |
719 | } | |
720 | ||
721 | for (i = 0; i < 6; i++) | |
722 | ecc_bit[i] = tmp2_bit[i + 2] ^ comp2_bit[i + 2]; | |
723 | ||
724 | for (i = 0; i < 8; i++) | |
725 | ecc_bit[i + 6] = tmp0_bit[i] ^ comp0_bit[i]; | |
726 | ||
727 | for (i = 0; i < 8; i++) | |
728 | ecc_bit[i + 14] = tmp1_bit[i] ^ comp1_bit[i]; | |
729 | ||
730 | ecc_bit[22] = tmp2_bit[0] ^ comp2_bit[0]; | |
731 | ecc_bit[23] = tmp2_bit[1] ^ comp2_bit[1]; | |
732 | ||
733 | for (i = 0; i < 24; i++) | |
734 | ecc_sum += ecc_bit[i]; | |
735 | ||
736 | switch (ecc_sum) { | |
737 | case 0: | |
738 | /* Not reached because this function is not called if | |
739 | * ECC values are equal | |
740 | */ | |
741 | return 0; | |
742 | ||
743 | case 1: | |
744 | /* Uncorrectable error */ | |
289c0522 | 745 | pr_debug("ECC UNCORRECTED_ERROR 1\n"); |
67ce04bf VS |
746 | return -1; |
747 | ||
748 | case 11: | |
749 | /* UN-Correctable error */ | |
289c0522 | 750 | pr_debug("ECC UNCORRECTED_ERROR B\n"); |
67ce04bf VS |
751 | return -1; |
752 | ||
753 | case 12: | |
754 | /* Correctable error */ | |
755 | find_byte = (ecc_bit[23] << 8) + | |
756 | (ecc_bit[21] << 7) + | |
757 | (ecc_bit[19] << 6) + | |
758 | (ecc_bit[17] << 5) + | |
759 | (ecc_bit[15] << 4) + | |
760 | (ecc_bit[13] << 3) + | |
761 | (ecc_bit[11] << 2) + | |
762 | (ecc_bit[9] << 1) + | |
763 | ecc_bit[7]; | |
764 | ||
765 | find_bit = (ecc_bit[5] << 2) + (ecc_bit[3] << 1) + ecc_bit[1]; | |
766 | ||
0a32a102 BN |
767 | pr_debug("Correcting single bit ECC error at offset: " |
768 | "%d, bit: %d\n", find_byte, find_bit); | |
67ce04bf VS |
769 | |
770 | page_data[find_byte] ^= (1 << find_bit); | |
771 | ||
74f1b724 | 772 | return 1; |
67ce04bf VS |
773 | default: |
774 | if (isEccFF) { | |
775 | if (ecc_data2[0] == 0 && | |
776 | ecc_data2[1] == 0 && | |
777 | ecc_data2[2] == 0) | |
778 | return 0; | |
779 | } | |
289c0522 | 780 | pr_debug("UNCORRECTED_ERROR default\n"); |
67ce04bf VS |
781 | return -1; |
782 | } | |
783 | } | |
784 | ||
785 | /** | |
786 | * omap_correct_data - Compares the ECC read with HW generated ECC | |
787 | * @mtd: MTD device structure | |
788 | * @dat: page data | |
789 | * @read_ecc: ecc read from nand flash | |
790 | * @calc_ecc: ecc read from HW ECC registers | |
791 | * | |
792 | * Compares the ecc read from nand spare area with ECC registers values | |
74f1b724 JO |
793 | * and if ECC's mismatched, it will call 'omap_compare_ecc' for error |
794 | * detection and correction. If there are no errors, %0 is returned. If | |
795 | * there were errors and all of the errors were corrected, the number of | |
796 | * corrected errors is returned. If uncorrectable errors exist, %-1 is | |
797 | * returned. | |
67ce04bf VS |
798 | */ |
799 | static int omap_correct_data(struct mtd_info *mtd, u_char *dat, | |
800 | u_char *read_ecc, u_char *calc_ecc) | |
801 | { | |
802 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, | |
803 | mtd); | |
804 | int blockCnt = 0, i = 0, ret = 0; | |
74f1b724 | 805 | int stat = 0; |
67ce04bf VS |
806 | |
807 | /* Ex NAND_ECC_HW12_2048 */ | |
808 | if ((info->nand.ecc.mode == NAND_ECC_HW) && | |
809 | (info->nand.ecc.size == 2048)) | |
810 | blockCnt = 4; | |
811 | else | |
812 | blockCnt = 1; | |
813 | ||
814 | for (i = 0; i < blockCnt; i++) { | |
815 | if (memcmp(read_ecc, calc_ecc, 3) != 0) { | |
816 | ret = omap_compare_ecc(read_ecc, calc_ecc, dat); | |
817 | if (ret < 0) | |
818 | return ret; | |
74f1b724 JO |
819 | /* keep track of the number of corrected errors */ |
820 | stat += ret; | |
67ce04bf VS |
821 | } |
822 | read_ecc += 3; | |
823 | calc_ecc += 3; | |
824 | dat += 512; | |
825 | } | |
74f1b724 | 826 | return stat; |
67ce04bf VS |
827 | } |
828 | ||
829 | /** | |
830 | * omap_calcuate_ecc - Generate non-inverted ECC bytes. | |
831 | * @mtd: MTD device structure | |
832 | * @dat: The pointer to data on which ecc is computed | |
833 | * @ecc_code: The ecc_code buffer | |
834 | * | |
835 | * Using noninverted ECC can be considered ugly since writing a blank | |
836 | * page ie. padding will clear the ECC bytes. This is no problem as long | |
837 | * nobody is trying to write data on the seemingly unused page. Reading | |
838 | * an erased page will produce an ECC mismatch between generated and read | |
839 | * ECC bytes that has to be dealt with separately. | |
840 | */ | |
841 | static int omap_calculate_ecc(struct mtd_info *mtd, const u_char *dat, | |
842 | u_char *ecc_code) | |
843 | { | |
844 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, | |
845 | mtd); | |
2c01946c | 846 | return gpmc_calculate_ecc(info->gpmc_cs, dat, ecc_code); |
67ce04bf VS |
847 | } |
848 | ||
849 | /** | |
850 | * omap_enable_hwecc - This function enables the hardware ecc functionality | |
851 | * @mtd: MTD device structure | |
852 | * @mode: Read/Write mode | |
853 | */ | |
854 | static void omap_enable_hwecc(struct mtd_info *mtd, int mode) | |
855 | { | |
856 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, | |
857 | mtd); | |
858 | struct nand_chip *chip = mtd->priv; | |
859 | unsigned int dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0; | |
67ce04bf | 860 | |
2c01946c | 861 | gpmc_enable_hwecc(info->gpmc_cs, mode, dev_width, info->nand.ecc.size); |
67ce04bf | 862 | } |
2c01946c | 863 | |
67ce04bf VS |
864 | /** |
865 | * omap_wait - wait until the command is done | |
866 | * @mtd: MTD device structure | |
867 | * @chip: NAND Chip structure | |
868 | * | |
869 | * Wait function is called during Program and erase operations and | |
870 | * the way it is called from MTD layer, we should wait till the NAND | |
871 | * chip is ready after the programming/erase operation has completed. | |
872 | * | |
873 | * Erase can take up to 400ms and program up to 20ms according to | |
874 | * general NAND and SmartMedia specs | |
875 | */ | |
876 | static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip) | |
877 | { | |
878 | struct nand_chip *this = mtd->priv; | |
879 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, | |
880 | mtd); | |
881 | unsigned long timeo = jiffies; | |
c276aca4 | 882 | int status = NAND_STATUS_FAIL, state = this->state; |
67ce04bf VS |
883 | |
884 | if (state == FL_ERASING) | |
885 | timeo += (HZ * 400) / 1000; | |
886 | else | |
887 | timeo += (HZ * 20) / 1000; | |
888 | ||
2c01946c SG |
889 | gpmc_nand_write(info->gpmc_cs, |
890 | GPMC_NAND_COMMAND, (NAND_CMD_STATUS & 0xFF)); | |
67ce04bf | 891 | while (time_before(jiffies, timeo)) { |
2c01946c | 892 | status = gpmc_nand_read(info->gpmc_cs, GPMC_NAND_DATA); |
c276aca4 | 893 | if (status & NAND_STATUS_READY) |
67ce04bf | 894 | break; |
c276aca4 | 895 | cond_resched(); |
67ce04bf VS |
896 | } |
897 | return status; | |
898 | } | |
899 | ||
900 | /** | |
901 | * omap_dev_ready - calls the platform specific dev_ready function | |
902 | * @mtd: MTD device structure | |
903 | */ | |
904 | static int omap_dev_ready(struct mtd_info *mtd) | |
905 | { | |
2c01946c | 906 | unsigned int val = 0; |
67ce04bf VS |
907 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
908 | mtd); | |
67ce04bf | 909 | |
2c01946c | 910 | val = gpmc_read_status(GPMC_GET_IRQ_STATUS); |
67ce04bf VS |
911 | if ((val & 0x100) == 0x100) { |
912 | /* Clear IRQ Interrupt */ | |
913 | val |= 0x100; | |
914 | val &= ~(0x0); | |
2c01946c | 915 | gpmc_cs_configure(info->gpmc_cs, GPMC_SET_IRQ_STATUS, val); |
67ce04bf VS |
916 | } else { |
917 | unsigned int cnt = 0; | |
918 | while (cnt++ < 0x1FF) { | |
919 | if ((val & 0x100) == 0x100) | |
920 | return 0; | |
2c01946c | 921 | val = gpmc_read_status(GPMC_GET_IRQ_STATUS); |
67ce04bf VS |
922 | } |
923 | } | |
924 | ||
925 | return 1; | |
926 | } | |
927 | ||
928 | static int __devinit omap_nand_probe(struct platform_device *pdev) | |
929 | { | |
930 | struct omap_nand_info *info; | |
931 | struct omap_nand_platform_data *pdata; | |
932 | int err; | |
f040d332 | 933 | int i, offset; |
67ce04bf VS |
934 | |
935 | pdata = pdev->dev.platform_data; | |
936 | if (pdata == NULL) { | |
937 | dev_err(&pdev->dev, "platform data missing\n"); | |
938 | return -ENODEV; | |
939 | } | |
940 | ||
941 | info = kzalloc(sizeof(struct omap_nand_info), GFP_KERNEL); | |
942 | if (!info) | |
943 | return -ENOMEM; | |
944 | ||
945 | platform_set_drvdata(pdev, info); | |
946 | ||
947 | spin_lock_init(&info->controller.lock); | |
948 | init_waitqueue_head(&info->controller.wq); | |
949 | ||
950 | info->pdev = pdev; | |
951 | ||
952 | info->gpmc_cs = pdata->cs; | |
2f70a1e9 | 953 | info->phys_base = pdata->phys_base; |
67ce04bf VS |
954 | |
955 | info->mtd.priv = &info->nand; | |
956 | info->mtd.name = dev_name(&pdev->dev); | |
957 | info->mtd.owner = THIS_MODULE; | |
958 | ||
d5ce2b65 | 959 | info->nand.options = pdata->devsize; |
2f70a1e9 | 960 | info->nand.options |= NAND_SKIP_BBTSCAN; |
67ce04bf VS |
961 | |
962 | /* NAND write protect off */ | |
2c01946c | 963 | gpmc_cs_configure(info->gpmc_cs, GPMC_CONFIG_WP, 0); |
67ce04bf VS |
964 | |
965 | if (!request_mem_region(info->phys_base, NAND_IO_SIZE, | |
966 | pdev->dev.driver->name)) { | |
967 | err = -EBUSY; | |
2f70a1e9 | 968 | goto out_free_info; |
67ce04bf VS |
969 | } |
970 | ||
971 | info->nand.IO_ADDR_R = ioremap(info->phys_base, NAND_IO_SIZE); | |
972 | if (!info->nand.IO_ADDR_R) { | |
973 | err = -ENOMEM; | |
974 | goto out_release_mem_region; | |
975 | } | |
59e9c5ae | 976 | |
67ce04bf VS |
977 | info->nand.controller = &info->controller; |
978 | ||
979 | info->nand.IO_ADDR_W = info->nand.IO_ADDR_R; | |
980 | info->nand.cmd_ctrl = omap_hwcontrol; | |
981 | ||
67ce04bf VS |
982 | /* |
983 | * If RDY/BSY line is connected to OMAP then use the omap ready | |
984 | * funcrtion and the generic nand_wait function which reads the status | |
985 | * register after monitoring the RDY/BSY line.Otherwise use a standard | |
986 | * chip delay which is slightly more than tR (AC Timing) of the NAND | |
987 | * device and read status register until you get a failure or success | |
988 | */ | |
989 | if (pdata->dev_ready) { | |
990 | info->nand.dev_ready = omap_dev_ready; | |
991 | info->nand.chip_delay = 0; | |
992 | } else { | |
993 | info->nand.waitfunc = omap_wait; | |
994 | info->nand.chip_delay = 50; | |
995 | } | |
996 | ||
1b0b323c SG |
997 | switch (pdata->xfer_type) { |
998 | case NAND_OMAP_PREFETCH_POLLED: | |
59e9c5ae | 999 | info->nand.read_buf = omap_read_buf_pref; |
1000 | info->nand.write_buf = omap_write_buf_pref; | |
1b0b323c SG |
1001 | break; |
1002 | ||
1003 | case NAND_OMAP_POLLED: | |
59e9c5ae | 1004 | if (info->nand.options & NAND_BUSWIDTH_16) { |
1005 | info->nand.read_buf = omap_read_buf16; | |
1006 | info->nand.write_buf = omap_write_buf16; | |
1007 | } else { | |
1008 | info->nand.read_buf = omap_read_buf8; | |
1009 | info->nand.write_buf = omap_write_buf8; | |
1010 | } | |
1b0b323c SG |
1011 | break; |
1012 | ||
1013 | case NAND_OMAP_PREFETCH_DMA: | |
1014 | err = omap_request_dma(OMAP24XX_DMA_GPMC, "NAND", | |
1015 | omap_nand_dma_cb, &info->comp, &info->dma_ch); | |
1016 | if (err < 0) { | |
1017 | info->dma_ch = -1; | |
1018 | dev_err(&pdev->dev, "DMA request failed!\n"); | |
1019 | goto out_release_mem_region; | |
1020 | } else { | |
1021 | omap_set_dma_dest_burst_mode(info->dma_ch, | |
1022 | OMAP_DMA_DATA_BURST_16); | |
1023 | omap_set_dma_src_burst_mode(info->dma_ch, | |
1024 | OMAP_DMA_DATA_BURST_16); | |
1025 | ||
1026 | info->nand.read_buf = omap_read_buf_dma_pref; | |
1027 | info->nand.write_buf = omap_write_buf_dma_pref; | |
1028 | } | |
1029 | break; | |
1030 | ||
4e070376 SG |
1031 | case NAND_OMAP_PREFETCH_IRQ: |
1032 | err = request_irq(pdata->gpmc_irq, | |
1033 | omap_nand_irq, IRQF_SHARED, "gpmc-nand", info); | |
1034 | if (err) { | |
1035 | dev_err(&pdev->dev, "requesting irq(%d) error:%d", | |
1036 | pdata->gpmc_irq, err); | |
1037 | goto out_release_mem_region; | |
1038 | } else { | |
1039 | info->gpmc_irq = pdata->gpmc_irq; | |
1040 | info->nand.read_buf = omap_read_buf_irq_pref; | |
1041 | info->nand.write_buf = omap_write_buf_irq_pref; | |
1042 | } | |
1043 | break; | |
1044 | ||
1b0b323c SG |
1045 | default: |
1046 | dev_err(&pdev->dev, | |
1047 | "xfer_type(%d) not supported!\n", pdata->xfer_type); | |
1048 | err = -EINVAL; | |
1049 | goto out_release_mem_region; | |
59e9c5ae | 1050 | } |
59e9c5ae | 1051 | |
59e9c5ae | 1052 | info->nand.verify_buf = omap_verify_buf; |
67ce04bf | 1053 | |
f3d73f36 SG |
1054 | /* selsect the ecc type */ |
1055 | if (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_DEFAULT) | |
1056 | info->nand.ecc.mode = NAND_ECC_SOFT; | |
f040d332 SG |
1057 | else if ((pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW) || |
1058 | (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW_ROMCODE)) { | |
f3d73f36 SG |
1059 | info->nand.ecc.bytes = 3; |
1060 | info->nand.ecc.size = 512; | |
1061 | info->nand.ecc.calculate = omap_calculate_ecc; | |
1062 | info->nand.ecc.hwctl = omap_enable_hwecc; | |
1063 | info->nand.ecc.correct = omap_correct_data; | |
1064 | info->nand.ecc.mode = NAND_ECC_HW; | |
1065 | } | |
67ce04bf VS |
1066 | |
1067 | /* DIP switches on some boards change between 8 and 16 bit | |
1068 | * bus widths for flash. Try the other width if the first try fails. | |
1069 | */ | |
a80f1c1f | 1070 | if (nand_scan_ident(&info->mtd, 1, NULL)) { |
67ce04bf | 1071 | info->nand.options ^= NAND_BUSWIDTH_16; |
a80f1c1f | 1072 | if (nand_scan_ident(&info->mtd, 1, NULL)) { |
67ce04bf VS |
1073 | err = -ENXIO; |
1074 | goto out_release_mem_region; | |
1075 | } | |
1076 | } | |
1077 | ||
f040d332 SG |
1078 | /* rom code layout */ |
1079 | if (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW_ROMCODE) { | |
1080 | ||
1081 | if (info->nand.options & NAND_BUSWIDTH_16) | |
1082 | offset = 2; | |
1083 | else { | |
1084 | offset = 1; | |
1085 | info->nand.badblock_pattern = &bb_descrip_flashbased; | |
1086 | } | |
1087 | omap_oobinfo.eccbytes = 3 * (info->mtd.oobsize/16); | |
1088 | for (i = 0; i < omap_oobinfo.eccbytes; i++) | |
1089 | omap_oobinfo.eccpos[i] = i+offset; | |
1090 | ||
1091 | omap_oobinfo.oobfree->offset = offset + omap_oobinfo.eccbytes; | |
1092 | omap_oobinfo.oobfree->length = info->mtd.oobsize - | |
1093 | (offset + omap_oobinfo.eccbytes); | |
1094 | ||
1095 | info->nand.ecc.layout = &omap_oobinfo; | |
1096 | } | |
1b0b323c | 1097 | |
a80f1c1f JW |
1098 | /* second phase scan */ |
1099 | if (nand_scan_tail(&info->mtd)) { | |
1100 | err = -ENXIO; | |
1101 | goto out_release_mem_region; | |
1102 | } | |
1103 | ||
69c85f1f DES |
1104 | mtd_device_parse_register(&info->mtd, NULL, 0, |
1105 | pdata->parts, pdata->nr_parts); | |
67ce04bf VS |
1106 | |
1107 | platform_set_drvdata(pdev, &info->mtd); | |
1108 | ||
1109 | return 0; | |
1110 | ||
1111 | out_release_mem_region: | |
1112 | release_mem_region(info->phys_base, NAND_IO_SIZE); | |
67ce04bf VS |
1113 | out_free_info: |
1114 | kfree(info); | |
1115 | ||
1116 | return err; | |
1117 | } | |
1118 | ||
1119 | static int omap_nand_remove(struct platform_device *pdev) | |
1120 | { | |
1121 | struct mtd_info *mtd = platform_get_drvdata(pdev); | |
f35b6eda VS |
1122 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
1123 | mtd); | |
67ce04bf VS |
1124 | |
1125 | platform_set_drvdata(pdev, NULL); | |
1b0b323c | 1126 | if (info->dma_ch != -1) |
dfe32893 | 1127 | omap_free_dma(info->dma_ch); |
1128 | ||
4e070376 SG |
1129 | if (info->gpmc_irq) |
1130 | free_irq(info->gpmc_irq, info); | |
1131 | ||
67ce04bf VS |
1132 | /* Release NAND device, its internal structures and partitions */ |
1133 | nand_release(&info->mtd); | |
2c01946c | 1134 | iounmap(info->nand.IO_ADDR_R); |
67ce04bf VS |
1135 | kfree(&info->mtd); |
1136 | return 0; | |
1137 | } | |
1138 | ||
1139 | static struct platform_driver omap_nand_driver = { | |
1140 | .probe = omap_nand_probe, | |
1141 | .remove = omap_nand_remove, | |
1142 | .driver = { | |
1143 | .name = DRIVER_NAME, | |
1144 | .owner = THIS_MODULE, | |
1145 | }, | |
1146 | }; | |
1147 | ||
f99640de | 1148 | module_platform_driver(omap_nand_driver); |
67ce04bf | 1149 | |
c804c733 | 1150 | MODULE_ALIAS("platform:" DRIVER_NAME); |
67ce04bf VS |
1151 | MODULE_LICENSE("GPL"); |
1152 | MODULE_DESCRIPTION("Glue layer for NAND flash on TI OMAP boards"); |