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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> | |
763e7359 | 12 | #include <linux/dmaengine.h> |
67ce04bf VS |
13 | #include <linux/dma-mapping.h> |
14 | #include <linux/delay.h> | |
10f22ee3 | 15 | #include <linux/gpio/consumer.h> |
a0e5cc58 | 16 | #include <linux/module.h> |
4e070376 | 17 | #include <linux/interrupt.h> |
c276aca4 | 18 | #include <linux/jiffies.h> |
19 | #include <linux/sched.h> | |
67ce04bf VS |
20 | #include <linux/mtd/mtd.h> |
21 | #include <linux/mtd/nand.h> | |
22 | #include <linux/mtd/partitions.h> | |
763e7359 | 23 | #include <linux/omap-dma.h> |
67ce04bf | 24 | #include <linux/io.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
62116e51 PA |
26 | #include <linux/of.h> |
27 | #include <linux/of_device.h> | |
c9711ec5 | 28 | #include <linux/of_mtd.h> |
67ce04bf | 29 | |
32d42a85 | 30 | #include <linux/mtd/nand_bch.h> |
62116e51 | 31 | #include <linux/platform_data/elm.h> |
0e618ef0 | 32 | |
c509aefd | 33 | #include <linux/omap-gpmc.h> |
2203747c | 34 | #include <linux/platform_data/mtd-nand-omap2.h> |
67ce04bf | 35 | |
67ce04bf | 36 | #define DRIVER_NAME "omap2-nand" |
4e070376 | 37 | #define OMAP_NAND_TIMEOUT_MS 5000 |
67ce04bf | 38 | |
67ce04bf VS |
39 | #define NAND_Ecc_P1e (1 << 0) |
40 | #define NAND_Ecc_P2e (1 << 1) | |
41 | #define NAND_Ecc_P4e (1 << 2) | |
42 | #define NAND_Ecc_P8e (1 << 3) | |
43 | #define NAND_Ecc_P16e (1 << 4) | |
44 | #define NAND_Ecc_P32e (1 << 5) | |
45 | #define NAND_Ecc_P64e (1 << 6) | |
46 | #define NAND_Ecc_P128e (1 << 7) | |
47 | #define NAND_Ecc_P256e (1 << 8) | |
48 | #define NAND_Ecc_P512e (1 << 9) | |
49 | #define NAND_Ecc_P1024e (1 << 10) | |
50 | #define NAND_Ecc_P2048e (1 << 11) | |
51 | ||
52 | #define NAND_Ecc_P1o (1 << 16) | |
53 | #define NAND_Ecc_P2o (1 << 17) | |
54 | #define NAND_Ecc_P4o (1 << 18) | |
55 | #define NAND_Ecc_P8o (1 << 19) | |
56 | #define NAND_Ecc_P16o (1 << 20) | |
57 | #define NAND_Ecc_P32o (1 << 21) | |
58 | #define NAND_Ecc_P64o (1 << 22) | |
59 | #define NAND_Ecc_P128o (1 << 23) | |
60 | #define NAND_Ecc_P256o (1 << 24) | |
61 | #define NAND_Ecc_P512o (1 << 25) | |
62 | #define NAND_Ecc_P1024o (1 << 26) | |
63 | #define NAND_Ecc_P2048o (1 << 27) | |
64 | ||
65 | #define TF(value) (value ? 1 : 0) | |
66 | ||
67 | #define P2048e(a) (TF(a & NAND_Ecc_P2048e) << 0) | |
68 | #define P2048o(a) (TF(a & NAND_Ecc_P2048o) << 1) | |
69 | #define P1e(a) (TF(a & NAND_Ecc_P1e) << 2) | |
70 | #define P1o(a) (TF(a & NAND_Ecc_P1o) << 3) | |
71 | #define P2e(a) (TF(a & NAND_Ecc_P2e) << 4) | |
72 | #define P2o(a) (TF(a & NAND_Ecc_P2o) << 5) | |
73 | #define P4e(a) (TF(a & NAND_Ecc_P4e) << 6) | |
74 | #define P4o(a) (TF(a & NAND_Ecc_P4o) << 7) | |
75 | ||
76 | #define P8e(a) (TF(a & NAND_Ecc_P8e) << 0) | |
77 | #define P8o(a) (TF(a & NAND_Ecc_P8o) << 1) | |
78 | #define P16e(a) (TF(a & NAND_Ecc_P16e) << 2) | |
79 | #define P16o(a) (TF(a & NAND_Ecc_P16o) << 3) | |
80 | #define P32e(a) (TF(a & NAND_Ecc_P32e) << 4) | |
81 | #define P32o(a) (TF(a & NAND_Ecc_P32o) << 5) | |
82 | #define P64e(a) (TF(a & NAND_Ecc_P64e) << 6) | |
83 | #define P64o(a) (TF(a & NAND_Ecc_P64o) << 7) | |
84 | ||
85 | #define P128e(a) (TF(a & NAND_Ecc_P128e) << 0) | |
86 | #define P128o(a) (TF(a & NAND_Ecc_P128o) << 1) | |
87 | #define P256e(a) (TF(a & NAND_Ecc_P256e) << 2) | |
88 | #define P256o(a) (TF(a & NAND_Ecc_P256o) << 3) | |
89 | #define P512e(a) (TF(a & NAND_Ecc_P512e) << 4) | |
90 | #define P512o(a) (TF(a & NAND_Ecc_P512o) << 5) | |
91 | #define P1024e(a) (TF(a & NAND_Ecc_P1024e) << 6) | |
92 | #define P1024o(a) (TF(a & NAND_Ecc_P1024o) << 7) | |
93 | ||
94 | #define P8e_s(a) (TF(a & NAND_Ecc_P8e) << 0) | |
95 | #define P8o_s(a) (TF(a & NAND_Ecc_P8o) << 1) | |
96 | #define P16e_s(a) (TF(a & NAND_Ecc_P16e) << 2) | |
97 | #define P16o_s(a) (TF(a & NAND_Ecc_P16o) << 3) | |
98 | #define P1e_s(a) (TF(a & NAND_Ecc_P1e) << 4) | |
99 | #define P1o_s(a) (TF(a & NAND_Ecc_P1o) << 5) | |
100 | #define P2e_s(a) (TF(a & NAND_Ecc_P2e) << 6) | |
101 | #define P2o_s(a) (TF(a & NAND_Ecc_P2o) << 7) | |
102 | ||
103 | #define P4e_s(a) (TF(a & NAND_Ecc_P4e) << 0) | |
104 | #define P4o_s(a) (TF(a & NAND_Ecc_P4o) << 1) | |
105 | ||
65b97cf6 AM |
106 | #define PREFETCH_CONFIG1_CS_SHIFT 24 |
107 | #define ECC_CONFIG_CS_SHIFT 1 | |
108 | #define CS_MASK 0x7 | |
109 | #define ENABLE_PREFETCH (0x1 << 7) | |
110 | #define DMA_MPU_MODE_SHIFT 2 | |
2ef9f3dd | 111 | #define ECCSIZE0_SHIFT 12 |
65b97cf6 AM |
112 | #define ECCSIZE1_SHIFT 22 |
113 | #define ECC1RESULTSIZE 0x1 | |
114 | #define ECCCLEAR 0x100 | |
115 | #define ECC1 0x1 | |
47f88af4 AM |
116 | #define PREFETCH_FIFOTHRESHOLD_MAX 0x40 |
117 | #define PREFETCH_FIFOTHRESHOLD(val) ((val) << 8) | |
118 | #define PREFETCH_STATUS_COUNT(val) (val & 0x00003fff) | |
119 | #define PREFETCH_STATUS_FIFO_CNT(val) ((val >> 24) & 0x7F) | |
120 | #define STATUS_BUFF_EMPTY 0x00000001 | |
65b97cf6 | 121 | |
d5e7c864 LV |
122 | #define OMAP24XX_DMA_GPMC 4 |
123 | ||
62116e51 PA |
124 | #define SECTOR_BYTES 512 |
125 | /* 4 bit padding to make byte aligned, 56 = 52 + 4 */ | |
126 | #define BCH4_BIT_PAD 4 | |
62116e51 PA |
127 | |
128 | /* GPMC ecc engine settings for read */ | |
129 | #define BCH_WRAPMODE_1 1 /* BCH wrap mode 1 */ | |
130 | #define BCH8R_ECC_SIZE0 0x1a /* ecc_size0 = 26 */ | |
131 | #define BCH8R_ECC_SIZE1 0x2 /* ecc_size1 = 2 */ | |
132 | #define BCH4R_ECC_SIZE0 0xd /* ecc_size0 = 13 */ | |
133 | #define BCH4R_ECC_SIZE1 0x3 /* ecc_size1 = 3 */ | |
134 | ||
135 | /* GPMC ecc engine settings for write */ | |
136 | #define BCH_WRAPMODE_6 6 /* BCH wrap mode 6 */ | |
137 | #define BCH_ECC_SIZE0 0x0 /* ecc_size0 = 0, no oob protection */ | |
138 | #define BCH_ECC_SIZE1 0x20 /* ecc_size1 = 32 */ | |
139 | ||
b491da72 | 140 | #define BADBLOCK_MARKER_LENGTH 2 |
a919e511 | 141 | |
9748fff9 | 142 | static u_char bch16_vector[] = {0xf5, 0x24, 0x1c, 0xd0, 0x61, 0xb3, 0xf1, 0x55, |
143 | 0x2e, 0x2c, 0x86, 0xa3, 0xed, 0x36, 0x1b, 0x78, | |
144 | 0x48, 0x76, 0xa9, 0x3b, 0x97, 0xd1, 0x7a, 0x93, | |
145 | 0x07, 0x0e}; | |
62116e51 PA |
146 | static u_char bch8_vector[] = {0xf3, 0xdb, 0x14, 0x16, 0x8b, 0xd2, 0xbe, 0xcc, |
147 | 0xac, 0x6b, 0xff, 0x99, 0x7b}; | |
148 | static u_char bch4_vector[] = {0x00, 0x6b, 0x31, 0xdd, 0x41, 0xbc, 0x10}; | |
62116e51 | 149 | |
1dc338e8 RL |
150 | /* Shared among all NAND instances to synchronize access to the ECC Engine */ |
151 | static struct nand_hw_control omap_gpmc_controller = { | |
152 | .lock = __SPIN_LOCK_UNLOCKED(omap_gpmc_controller.lock), | |
153 | .wq = __WAIT_QUEUE_HEAD_INITIALIZER(omap_gpmc_controller.wq), | |
154 | }; | |
59e9c5ae | 155 | |
67ce04bf | 156 | struct omap_nand_info { |
67ce04bf VS |
157 | struct nand_chip nand; |
158 | struct platform_device *pdev; | |
159 | ||
160 | int gpmc_cs; | |
01b95fc6 RQ |
161 | bool dev_ready; |
162 | enum nand_io xfer_type; | |
163 | int devsize; | |
4e558072 | 164 | enum omap_ecc ecc_opt; |
01b95fc6 RQ |
165 | struct device_node *elm_of_node; |
166 | ||
167 | unsigned long phys_base; | |
dfe32893 | 168 | struct completion comp; |
763e7359 | 169 | struct dma_chan *dma; |
5c468455 AM |
170 | int gpmc_irq_fifo; |
171 | int gpmc_irq_count; | |
4e070376 SG |
172 | enum { |
173 | OMAP_NAND_IO_READ = 0, /* read */ | |
174 | OMAP_NAND_IO_WRITE, /* write */ | |
175 | } iomode; | |
176 | u_char *buf; | |
177 | int buf_len; | |
c509aefd | 178 | /* Interface to GPMC */ |
65b97cf6 | 179 | struct gpmc_nand_regs reg; |
c509aefd | 180 | struct gpmc_nand_ops *ops; |
c9711ec5 | 181 | bool flash_bbt; |
94cb4ee0 RL |
182 | /* generated at runtime depending on ECC algorithm and layout selected */ |
183 | struct nand_ecclayout oobinfo; | |
a919e511 | 184 | /* fields specific for BCHx_HW ECC scheme */ |
62116e51 | 185 | struct device *elm_dev; |
10f22ee3 RQ |
186 | /* NAND ready gpio */ |
187 | struct gpio_desc *ready_gpiod; | |
67ce04bf VS |
188 | }; |
189 | ||
4578ea9a BB |
190 | static inline struct omap_nand_info *mtd_to_omap(struct mtd_info *mtd) |
191 | { | |
432420c0 | 192 | return container_of(mtd_to_nand(mtd), struct omap_nand_info, nand); |
4578ea9a | 193 | } |
432420c0 | 194 | |
65b97cf6 AM |
195 | /** |
196 | * omap_prefetch_enable - configures and starts prefetch transfer | |
197 | * @cs: cs (chip select) number | |
198 | * @fifo_th: fifo threshold to be used for read/ write | |
199 | * @dma_mode: dma mode enable (1) or disable (0) | |
200 | * @u32_count: number of bytes to be transferred | |
201 | * @is_write: prefetch read(0) or write post(1) mode | |
202 | */ | |
203 | static int omap_prefetch_enable(int cs, int fifo_th, int dma_mode, | |
204 | unsigned int u32_count, int is_write, struct omap_nand_info *info) | |
205 | { | |
206 | u32 val; | |
207 | ||
208 | if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX) | |
209 | return -1; | |
210 | ||
211 | if (readl(info->reg.gpmc_prefetch_control)) | |
212 | return -EBUSY; | |
213 | ||
214 | /* Set the amount of bytes to be prefetched */ | |
215 | writel(u32_count, info->reg.gpmc_prefetch_config2); | |
216 | ||
217 | /* Set dma/mpu mode, the prefetch read / post write and | |
218 | * enable the engine. Set which cs is has requested for. | |
219 | */ | |
220 | val = ((cs << PREFETCH_CONFIG1_CS_SHIFT) | | |
221 | PREFETCH_FIFOTHRESHOLD(fifo_th) | ENABLE_PREFETCH | | |
222 | (dma_mode << DMA_MPU_MODE_SHIFT) | (0x1 & is_write)); | |
223 | writel(val, info->reg.gpmc_prefetch_config1); | |
224 | ||
225 | /* Start the prefetch engine */ | |
226 | writel(0x1, info->reg.gpmc_prefetch_control); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | /** | |
232 | * omap_prefetch_reset - disables and stops the prefetch engine | |
233 | */ | |
234 | static int omap_prefetch_reset(int cs, struct omap_nand_info *info) | |
235 | { | |
236 | u32 config1; | |
237 | ||
238 | /* check if the same module/cs is trying to reset */ | |
239 | config1 = readl(info->reg.gpmc_prefetch_config1); | |
240 | if (((config1 >> PREFETCH_CONFIG1_CS_SHIFT) & CS_MASK) != cs) | |
241 | return -EINVAL; | |
242 | ||
243 | /* Stop the PFPW engine */ | |
244 | writel(0x0, info->reg.gpmc_prefetch_control); | |
245 | ||
246 | /* Reset/disable the PFPW engine */ | |
247 | writel(0x0, info->reg.gpmc_prefetch_config1); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
67ce04bf VS |
252 | /** |
253 | * omap_hwcontrol - hardware specific access to control-lines | |
254 | * @mtd: MTD device structure | |
255 | * @cmd: command to device | |
256 | * @ctrl: | |
257 | * NAND_NCE: bit 0 -> don't care | |
258 | * NAND_CLE: bit 1 -> Command Latch | |
259 | * NAND_ALE: bit 2 -> Address Latch | |
260 | * | |
261 | * NOTE: boards may use different bits for these!! | |
262 | */ | |
263 | static void omap_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) | |
264 | { | |
4578ea9a | 265 | struct omap_nand_info *info = mtd_to_omap(mtd); |
67ce04bf | 266 | |
2c01946c SG |
267 | if (cmd != NAND_CMD_NONE) { |
268 | if (ctrl & NAND_CLE) | |
65b97cf6 | 269 | writeb(cmd, info->reg.gpmc_nand_command); |
2c01946c SG |
270 | |
271 | else if (ctrl & NAND_ALE) | |
65b97cf6 | 272 | writeb(cmd, info->reg.gpmc_nand_address); |
2c01946c SG |
273 | |
274 | else /* NAND_NCE */ | |
65b97cf6 | 275 | writeb(cmd, info->reg.gpmc_nand_data); |
2c01946c | 276 | } |
67ce04bf VS |
277 | } |
278 | ||
59e9c5ae | 279 | /** |
280 | * omap_read_buf8 - read data from NAND controller into buffer | |
281 | * @mtd: MTD device structure | |
282 | * @buf: buffer to store date | |
283 | * @len: number of bytes to read | |
284 | */ | |
285 | static void omap_read_buf8(struct mtd_info *mtd, u_char *buf, int len) | |
286 | { | |
4bd4ebcc | 287 | struct nand_chip *nand = mtd_to_nand(mtd); |
59e9c5ae | 288 | |
289 | ioread8_rep(nand->IO_ADDR_R, buf, len); | |
290 | } | |
291 | ||
292 | /** | |
293 | * omap_write_buf8 - write buffer to NAND controller | |
294 | * @mtd: MTD device structure | |
295 | * @buf: data buffer | |
296 | * @len: number of bytes to write | |
297 | */ | |
298 | static void omap_write_buf8(struct mtd_info *mtd, const u_char *buf, int len) | |
299 | { | |
4578ea9a | 300 | struct omap_nand_info *info = mtd_to_omap(mtd); |
59e9c5ae | 301 | u_char *p = (u_char *)buf; |
d6e55216 | 302 | bool status; |
59e9c5ae | 303 | |
304 | while (len--) { | |
305 | iowrite8(*p++, info->nand.IO_ADDR_W); | |
2c01946c SG |
306 | /* wait until buffer is available for write */ |
307 | do { | |
d6e55216 | 308 | status = info->ops->nand_writebuffer_empty(); |
2c01946c | 309 | } while (!status); |
59e9c5ae | 310 | } |
311 | } | |
312 | ||
67ce04bf VS |
313 | /** |
314 | * omap_read_buf16 - read data from NAND controller into buffer | |
315 | * @mtd: MTD device structure | |
316 | * @buf: buffer to store date | |
317 | * @len: number of bytes to read | |
318 | */ | |
319 | static void omap_read_buf16(struct mtd_info *mtd, u_char *buf, int len) | |
320 | { | |
4bd4ebcc | 321 | struct nand_chip *nand = mtd_to_nand(mtd); |
67ce04bf | 322 | |
59e9c5ae | 323 | ioread16_rep(nand->IO_ADDR_R, buf, len / 2); |
67ce04bf VS |
324 | } |
325 | ||
326 | /** | |
327 | * omap_write_buf16 - write buffer to NAND controller | |
328 | * @mtd: MTD device structure | |
329 | * @buf: data buffer | |
330 | * @len: number of bytes to write | |
331 | */ | |
332 | static void omap_write_buf16(struct mtd_info *mtd, const u_char * buf, int len) | |
333 | { | |
4578ea9a | 334 | struct omap_nand_info *info = mtd_to_omap(mtd); |
67ce04bf | 335 | u16 *p = (u16 *) buf; |
d6e55216 | 336 | bool status; |
67ce04bf VS |
337 | /* FIXME try bursts of writesw() or DMA ... */ |
338 | len >>= 1; | |
339 | ||
340 | while (len--) { | |
59e9c5ae | 341 | iowrite16(*p++, info->nand.IO_ADDR_W); |
2c01946c SG |
342 | /* wait until buffer is available for write */ |
343 | do { | |
d6e55216 | 344 | status = info->ops->nand_writebuffer_empty(); |
2c01946c | 345 | } while (!status); |
67ce04bf VS |
346 | } |
347 | } | |
59e9c5ae | 348 | |
349 | /** | |
350 | * omap_read_buf_pref - read data from NAND controller into buffer | |
351 | * @mtd: MTD device structure | |
352 | * @buf: buffer to store date | |
353 | * @len: number of bytes to read | |
354 | */ | |
355 | static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len) | |
356 | { | |
4578ea9a | 357 | struct omap_nand_info *info = mtd_to_omap(mtd); |
2c01946c | 358 | uint32_t r_count = 0; |
59e9c5ae | 359 | int ret = 0; |
360 | u32 *p = (u32 *)buf; | |
361 | ||
362 | /* take care of subpage reads */ | |
c3341d0c VS |
363 | if (len % 4) { |
364 | if (info->nand.options & NAND_BUSWIDTH_16) | |
365 | omap_read_buf16(mtd, buf, len % 4); | |
366 | else | |
367 | omap_read_buf8(mtd, buf, len % 4); | |
368 | p = (u32 *) (buf + len % 4); | |
369 | len -= len % 4; | |
59e9c5ae | 370 | } |
59e9c5ae | 371 | |
372 | /* configure and start prefetch transfer */ | |
65b97cf6 AM |
373 | ret = omap_prefetch_enable(info->gpmc_cs, |
374 | PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x0, info); | |
59e9c5ae | 375 | if (ret) { |
376 | /* PFPW engine is busy, use cpu copy method */ | |
377 | if (info->nand.options & NAND_BUSWIDTH_16) | |
c5d8c0ca | 378 | omap_read_buf16(mtd, (u_char *)p, len); |
59e9c5ae | 379 | else |
c5d8c0ca | 380 | omap_read_buf8(mtd, (u_char *)p, len); |
59e9c5ae | 381 | } else { |
382 | do { | |
65b97cf6 | 383 | r_count = readl(info->reg.gpmc_prefetch_status); |
47f88af4 | 384 | r_count = PREFETCH_STATUS_FIFO_CNT(r_count); |
2c01946c SG |
385 | r_count = r_count >> 2; |
386 | ioread32_rep(info->nand.IO_ADDR_R, p, r_count); | |
59e9c5ae | 387 | p += r_count; |
388 | len -= r_count << 2; | |
389 | } while (len); | |
59e9c5ae | 390 | /* disable and stop the PFPW engine */ |
65b97cf6 | 391 | omap_prefetch_reset(info->gpmc_cs, info); |
59e9c5ae | 392 | } |
393 | } | |
394 | ||
395 | /** | |
396 | * omap_write_buf_pref - write buffer to NAND controller | |
397 | * @mtd: MTD device structure | |
398 | * @buf: data buffer | |
399 | * @len: number of bytes to write | |
400 | */ | |
401 | static void omap_write_buf_pref(struct mtd_info *mtd, | |
402 | const u_char *buf, int len) | |
403 | { | |
4578ea9a | 404 | struct omap_nand_info *info = mtd_to_omap(mtd); |
4e070376 | 405 | uint32_t w_count = 0; |
59e9c5ae | 406 | int i = 0, ret = 0; |
c5d8c0ca | 407 | u16 *p = (u16 *)buf; |
4e070376 | 408 | unsigned long tim, limit; |
65b97cf6 | 409 | u32 val; |
59e9c5ae | 410 | |
411 | /* take care of subpage writes */ | |
412 | if (len % 2 != 0) { | |
2c01946c | 413 | writeb(*buf, info->nand.IO_ADDR_W); |
59e9c5ae | 414 | p = (u16 *)(buf + 1); |
415 | len--; | |
416 | } | |
417 | ||
418 | /* configure and start prefetch transfer */ | |
65b97cf6 AM |
419 | ret = omap_prefetch_enable(info->gpmc_cs, |
420 | PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x1, info); | |
59e9c5ae | 421 | if (ret) { |
422 | /* PFPW engine is busy, use cpu copy method */ | |
423 | if (info->nand.options & NAND_BUSWIDTH_16) | |
c5d8c0ca | 424 | omap_write_buf16(mtd, (u_char *)p, len); |
59e9c5ae | 425 | else |
c5d8c0ca | 426 | omap_write_buf8(mtd, (u_char *)p, len); |
59e9c5ae | 427 | } else { |
2c01946c | 428 | while (len) { |
65b97cf6 | 429 | w_count = readl(info->reg.gpmc_prefetch_status); |
47f88af4 | 430 | w_count = PREFETCH_STATUS_FIFO_CNT(w_count); |
2c01946c | 431 | w_count = w_count >> 1; |
59e9c5ae | 432 | for (i = 0; (i < w_count) && len; i++, len -= 2) |
2c01946c | 433 | iowrite16(*p++, info->nand.IO_ADDR_W); |
59e9c5ae | 434 | } |
2c01946c | 435 | /* wait for data to flushed-out before reset the prefetch */ |
4e070376 SG |
436 | tim = 0; |
437 | limit = (loops_per_jiffy * | |
438 | msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS)); | |
65b97cf6 | 439 | do { |
4e070376 | 440 | cpu_relax(); |
65b97cf6 | 441 | val = readl(info->reg.gpmc_prefetch_status); |
47f88af4 | 442 | val = PREFETCH_STATUS_COUNT(val); |
65b97cf6 | 443 | } while (val && (tim++ < limit)); |
4e070376 | 444 | |
59e9c5ae | 445 | /* disable and stop the PFPW engine */ |
65b97cf6 | 446 | omap_prefetch_reset(info->gpmc_cs, info); |
59e9c5ae | 447 | } |
448 | } | |
449 | ||
dfe32893 | 450 | /* |
2df41d05 | 451 | * omap_nand_dma_callback: callback on the completion of dma transfer |
dfe32893 | 452 | * @data: pointer to completion data structure |
453 | */ | |
763e7359 RK |
454 | static void omap_nand_dma_callback(void *data) |
455 | { | |
456 | complete((struct completion *) data); | |
457 | } | |
dfe32893 | 458 | |
459 | /* | |
4cacbe22 | 460 | * omap_nand_dma_transfer: configure and start dma transfer |
dfe32893 | 461 | * @mtd: MTD device structure |
462 | * @addr: virtual address in RAM of source/destination | |
463 | * @len: number of data bytes to be transferred | |
464 | * @is_write: flag for read/write operation | |
465 | */ | |
466 | static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr, | |
467 | unsigned int len, int is_write) | |
468 | { | |
4578ea9a | 469 | struct omap_nand_info *info = mtd_to_omap(mtd); |
2df41d05 | 470 | struct dma_async_tx_descriptor *tx; |
dfe32893 | 471 | enum dma_data_direction dir = is_write ? DMA_TO_DEVICE : |
472 | DMA_FROM_DEVICE; | |
2df41d05 | 473 | struct scatterlist sg; |
4e070376 | 474 | unsigned long tim, limit; |
2df41d05 RK |
475 | unsigned n; |
476 | int ret; | |
65b97cf6 | 477 | u32 val; |
dfe32893 | 478 | |
479 | if (addr >= high_memory) { | |
480 | struct page *p1; | |
481 | ||
482 | if (((size_t)addr & PAGE_MASK) != | |
483 | ((size_t)(addr + len - 1) & PAGE_MASK)) | |
484 | goto out_copy; | |
485 | p1 = vmalloc_to_page(addr); | |
486 | if (!p1) | |
487 | goto out_copy; | |
488 | addr = page_address(p1) + ((size_t)addr & ~PAGE_MASK); | |
489 | } | |
490 | ||
2df41d05 RK |
491 | sg_init_one(&sg, addr, len); |
492 | n = dma_map_sg(info->dma->device->dev, &sg, 1, dir); | |
493 | if (n == 0) { | |
dfe32893 | 494 | dev_err(&info->pdev->dev, |
495 | "Couldn't DMA map a %d byte buffer\n", len); | |
496 | goto out_copy; | |
497 | } | |
498 | ||
2df41d05 RK |
499 | tx = dmaengine_prep_slave_sg(info->dma, &sg, n, |
500 | is_write ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, | |
501 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
502 | if (!tx) | |
503 | goto out_copy_unmap; | |
504 | ||
505 | tx->callback = omap_nand_dma_callback; | |
506 | tx->callback_param = &info->comp; | |
507 | dmaengine_submit(tx); | |
508 | ||
65b97cf6 AM |
509 | /* configure and start prefetch transfer */ |
510 | ret = omap_prefetch_enable(info->gpmc_cs, | |
511 | PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write, info); | |
dfe32893 | 512 | if (ret) |
4e070376 | 513 | /* PFPW engine is busy, use cpu copy method */ |
d7efe228 | 514 | goto out_copy_unmap; |
dfe32893 | 515 | |
516 | init_completion(&info->comp); | |
2df41d05 | 517 | dma_async_issue_pending(info->dma); |
dfe32893 | 518 | |
519 | /* setup and start DMA using dma_addr */ | |
520 | wait_for_completion(&info->comp); | |
4e070376 SG |
521 | tim = 0; |
522 | limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS)); | |
65b97cf6 AM |
523 | |
524 | do { | |
4e070376 | 525 | cpu_relax(); |
65b97cf6 | 526 | val = readl(info->reg.gpmc_prefetch_status); |
47f88af4 | 527 | val = PREFETCH_STATUS_COUNT(val); |
65b97cf6 | 528 | } while (val && (tim++ < limit)); |
dfe32893 | 529 | |
dfe32893 | 530 | /* disable and stop the PFPW engine */ |
65b97cf6 | 531 | omap_prefetch_reset(info->gpmc_cs, info); |
dfe32893 | 532 | |
2df41d05 | 533 | dma_unmap_sg(info->dma->device->dev, &sg, 1, dir); |
dfe32893 | 534 | return 0; |
535 | ||
d7efe228 | 536 | out_copy_unmap: |
2df41d05 | 537 | dma_unmap_sg(info->dma->device->dev, &sg, 1, dir); |
dfe32893 | 538 | out_copy: |
539 | if (info->nand.options & NAND_BUSWIDTH_16) | |
540 | is_write == 0 ? omap_read_buf16(mtd, (u_char *) addr, len) | |
541 | : omap_write_buf16(mtd, (u_char *) addr, len); | |
542 | else | |
543 | is_write == 0 ? omap_read_buf8(mtd, (u_char *) addr, len) | |
544 | : omap_write_buf8(mtd, (u_char *) addr, len); | |
545 | return 0; | |
546 | } | |
dfe32893 | 547 | |
548 | /** | |
549 | * omap_read_buf_dma_pref - read data from NAND controller into buffer | |
550 | * @mtd: MTD device structure | |
551 | * @buf: buffer to store date | |
552 | * @len: number of bytes to read | |
553 | */ | |
554 | static void omap_read_buf_dma_pref(struct mtd_info *mtd, u_char *buf, int len) | |
555 | { | |
556 | if (len <= mtd->oobsize) | |
557 | omap_read_buf_pref(mtd, buf, len); | |
558 | else | |
559 | /* start transfer in DMA mode */ | |
560 | omap_nand_dma_transfer(mtd, buf, len, 0x0); | |
561 | } | |
562 | ||
563 | /** | |
564 | * omap_write_buf_dma_pref - write buffer to NAND controller | |
565 | * @mtd: MTD device structure | |
566 | * @buf: data buffer | |
567 | * @len: number of bytes to write | |
568 | */ | |
569 | static void omap_write_buf_dma_pref(struct mtd_info *mtd, | |
570 | const u_char *buf, int len) | |
571 | { | |
572 | if (len <= mtd->oobsize) | |
573 | omap_write_buf_pref(mtd, buf, len); | |
574 | else | |
575 | /* start transfer in DMA mode */ | |
bdaefc41 | 576 | omap_nand_dma_transfer(mtd, (u_char *) buf, len, 0x1); |
dfe32893 | 577 | } |
578 | ||
4e070376 | 579 | /* |
4cacbe22 | 580 | * omap_nand_irq - GPMC irq handler |
4e070376 SG |
581 | * @this_irq: gpmc irq number |
582 | * @dev: omap_nand_info structure pointer is passed here | |
583 | */ | |
584 | static irqreturn_t omap_nand_irq(int this_irq, void *dev) | |
585 | { | |
586 | struct omap_nand_info *info = (struct omap_nand_info *) dev; | |
587 | u32 bytes; | |
4e070376 | 588 | |
65b97cf6 | 589 | bytes = readl(info->reg.gpmc_prefetch_status); |
47f88af4 | 590 | bytes = PREFETCH_STATUS_FIFO_CNT(bytes); |
4e070376 SG |
591 | bytes = bytes & 0xFFFC; /* io in multiple of 4 bytes */ |
592 | if (info->iomode == OMAP_NAND_IO_WRITE) { /* checks for write io */ | |
5c468455 | 593 | if (this_irq == info->gpmc_irq_count) |
4e070376 SG |
594 | goto done; |
595 | ||
596 | if (info->buf_len && (info->buf_len < bytes)) | |
597 | bytes = info->buf_len; | |
598 | else if (!info->buf_len) | |
599 | bytes = 0; | |
600 | iowrite32_rep(info->nand.IO_ADDR_W, | |
601 | (u32 *)info->buf, bytes >> 2); | |
602 | info->buf = info->buf + bytes; | |
603 | info->buf_len -= bytes; | |
604 | ||
605 | } else { | |
606 | ioread32_rep(info->nand.IO_ADDR_R, | |
607 | (u32 *)info->buf, bytes >> 2); | |
608 | info->buf = info->buf + bytes; | |
609 | ||
5c468455 | 610 | if (this_irq == info->gpmc_irq_count) |
4e070376 SG |
611 | goto done; |
612 | } | |
4e070376 SG |
613 | |
614 | return IRQ_HANDLED; | |
615 | ||
616 | done: | |
617 | complete(&info->comp); | |
4e070376 | 618 | |
5c468455 AM |
619 | disable_irq_nosync(info->gpmc_irq_fifo); |
620 | disable_irq_nosync(info->gpmc_irq_count); | |
4e070376 SG |
621 | |
622 | return IRQ_HANDLED; | |
623 | } | |
624 | ||
625 | /* | |
626 | * omap_read_buf_irq_pref - read data from NAND controller into buffer | |
627 | * @mtd: MTD device structure | |
628 | * @buf: buffer to store date | |
629 | * @len: number of bytes to read | |
630 | */ | |
631 | static void omap_read_buf_irq_pref(struct mtd_info *mtd, u_char *buf, int len) | |
632 | { | |
4578ea9a | 633 | struct omap_nand_info *info = mtd_to_omap(mtd); |
4e070376 SG |
634 | int ret = 0; |
635 | ||
636 | if (len <= mtd->oobsize) { | |
637 | omap_read_buf_pref(mtd, buf, len); | |
638 | return; | |
639 | } | |
640 | ||
641 | info->iomode = OMAP_NAND_IO_READ; | |
642 | info->buf = buf; | |
643 | init_completion(&info->comp); | |
644 | ||
645 | /* configure and start prefetch transfer */ | |
65b97cf6 AM |
646 | ret = omap_prefetch_enable(info->gpmc_cs, |
647 | PREFETCH_FIFOTHRESHOLD_MAX/2, 0x0, len, 0x0, info); | |
4e070376 SG |
648 | if (ret) |
649 | /* PFPW engine is busy, use cpu copy method */ | |
650 | goto out_copy; | |
651 | ||
652 | info->buf_len = len; | |
5c468455 AM |
653 | |
654 | enable_irq(info->gpmc_irq_count); | |
655 | enable_irq(info->gpmc_irq_fifo); | |
4e070376 SG |
656 | |
657 | /* waiting for read to complete */ | |
658 | wait_for_completion(&info->comp); | |
659 | ||
660 | /* disable and stop the PFPW engine */ | |
65b97cf6 | 661 | omap_prefetch_reset(info->gpmc_cs, info); |
4e070376 SG |
662 | return; |
663 | ||
664 | out_copy: | |
665 | if (info->nand.options & NAND_BUSWIDTH_16) | |
666 | omap_read_buf16(mtd, buf, len); | |
667 | else | |
668 | omap_read_buf8(mtd, buf, len); | |
669 | } | |
670 | ||
671 | /* | |
672 | * omap_write_buf_irq_pref - write buffer to NAND controller | |
673 | * @mtd: MTD device structure | |
674 | * @buf: data buffer | |
675 | * @len: number of bytes to write | |
676 | */ | |
677 | static void omap_write_buf_irq_pref(struct mtd_info *mtd, | |
678 | const u_char *buf, int len) | |
679 | { | |
4578ea9a | 680 | struct omap_nand_info *info = mtd_to_omap(mtd); |
4e070376 SG |
681 | int ret = 0; |
682 | unsigned long tim, limit; | |
65b97cf6 | 683 | u32 val; |
4e070376 SG |
684 | |
685 | if (len <= mtd->oobsize) { | |
686 | omap_write_buf_pref(mtd, buf, len); | |
687 | return; | |
688 | } | |
689 | ||
690 | info->iomode = OMAP_NAND_IO_WRITE; | |
691 | info->buf = (u_char *) buf; | |
692 | init_completion(&info->comp); | |
693 | ||
317379a9 | 694 | /* configure and start prefetch transfer : size=24 */ |
65b97cf6 AM |
695 | ret = omap_prefetch_enable(info->gpmc_cs, |
696 | (PREFETCH_FIFOTHRESHOLD_MAX * 3) / 8, 0x0, len, 0x1, info); | |
4e070376 SG |
697 | if (ret) |
698 | /* PFPW engine is busy, use cpu copy method */ | |
699 | goto out_copy; | |
700 | ||
701 | info->buf_len = len; | |
5c468455 AM |
702 | |
703 | enable_irq(info->gpmc_irq_count); | |
704 | enable_irq(info->gpmc_irq_fifo); | |
4e070376 SG |
705 | |
706 | /* waiting for write to complete */ | |
707 | wait_for_completion(&info->comp); | |
5c468455 | 708 | |
4e070376 SG |
709 | /* wait for data to flushed-out before reset the prefetch */ |
710 | tim = 0; | |
711 | limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS)); | |
65b97cf6 AM |
712 | do { |
713 | val = readl(info->reg.gpmc_prefetch_status); | |
47f88af4 | 714 | val = PREFETCH_STATUS_COUNT(val); |
4e070376 | 715 | cpu_relax(); |
65b97cf6 | 716 | } while (val && (tim++ < limit)); |
4e070376 SG |
717 | |
718 | /* disable and stop the PFPW engine */ | |
65b97cf6 | 719 | omap_prefetch_reset(info->gpmc_cs, info); |
4e070376 SG |
720 | return; |
721 | ||
722 | out_copy: | |
723 | if (info->nand.options & NAND_BUSWIDTH_16) | |
724 | omap_write_buf16(mtd, buf, len); | |
725 | else | |
726 | omap_write_buf8(mtd, buf, len); | |
727 | } | |
728 | ||
67ce04bf VS |
729 | /** |
730 | * gen_true_ecc - This function will generate true ECC value | |
731 | * @ecc_buf: buffer to store ecc code | |
732 | * | |
733 | * This generated true ECC value can be used when correcting | |
734 | * data read from NAND flash memory core | |
735 | */ | |
736 | static void gen_true_ecc(u8 *ecc_buf) | |
737 | { | |
738 | u32 tmp = ecc_buf[0] | (ecc_buf[1] << 16) | | |
739 | ((ecc_buf[2] & 0xF0) << 20) | ((ecc_buf[2] & 0x0F) << 8); | |
740 | ||
741 | ecc_buf[0] = ~(P64o(tmp) | P64e(tmp) | P32o(tmp) | P32e(tmp) | | |
742 | P16o(tmp) | P16e(tmp) | P8o(tmp) | P8e(tmp)); | |
743 | ecc_buf[1] = ~(P1024o(tmp) | P1024e(tmp) | P512o(tmp) | P512e(tmp) | | |
744 | P256o(tmp) | P256e(tmp) | P128o(tmp) | P128e(tmp)); | |
745 | ecc_buf[2] = ~(P4o(tmp) | P4e(tmp) | P2o(tmp) | P2e(tmp) | P1o(tmp) | | |
746 | P1e(tmp) | P2048o(tmp) | P2048e(tmp)); | |
747 | } | |
748 | ||
749 | /** | |
750 | * omap_compare_ecc - Detect (2 bits) and correct (1 bit) error in data | |
751 | * @ecc_data1: ecc code from nand spare area | |
752 | * @ecc_data2: ecc code from hardware register obtained from hardware ecc | |
753 | * @page_data: page data | |
754 | * | |
755 | * This function compares two ECC's and indicates if there is an error. | |
756 | * If the error can be corrected it will be corrected to the buffer. | |
74f1b724 JO |
757 | * If there is no error, %0 is returned. If there is an error but it |
758 | * was corrected, %1 is returned. Otherwise, %-1 is returned. | |
67ce04bf VS |
759 | */ |
760 | static int omap_compare_ecc(u8 *ecc_data1, /* read from NAND memory */ | |
761 | u8 *ecc_data2, /* read from register */ | |
762 | u8 *page_data) | |
763 | { | |
764 | uint i; | |
765 | u8 tmp0_bit[8], tmp1_bit[8], tmp2_bit[8]; | |
766 | u8 comp0_bit[8], comp1_bit[8], comp2_bit[8]; | |
767 | u8 ecc_bit[24]; | |
768 | u8 ecc_sum = 0; | |
769 | u8 find_bit = 0; | |
770 | uint find_byte = 0; | |
771 | int isEccFF; | |
772 | ||
773 | isEccFF = ((*(u32 *)ecc_data1 & 0xFFFFFF) == 0xFFFFFF); | |
774 | ||
775 | gen_true_ecc(ecc_data1); | |
776 | gen_true_ecc(ecc_data2); | |
777 | ||
778 | for (i = 0; i <= 2; i++) { | |
779 | *(ecc_data1 + i) = ~(*(ecc_data1 + i)); | |
780 | *(ecc_data2 + i) = ~(*(ecc_data2 + i)); | |
781 | } | |
782 | ||
783 | for (i = 0; i < 8; i++) { | |
784 | tmp0_bit[i] = *ecc_data1 % 2; | |
785 | *ecc_data1 = *ecc_data1 / 2; | |
786 | } | |
787 | ||
788 | for (i = 0; i < 8; i++) { | |
789 | tmp1_bit[i] = *(ecc_data1 + 1) % 2; | |
790 | *(ecc_data1 + 1) = *(ecc_data1 + 1) / 2; | |
791 | } | |
792 | ||
793 | for (i = 0; i < 8; i++) { | |
794 | tmp2_bit[i] = *(ecc_data1 + 2) % 2; | |
795 | *(ecc_data1 + 2) = *(ecc_data1 + 2) / 2; | |
796 | } | |
797 | ||
798 | for (i = 0; i < 8; i++) { | |
799 | comp0_bit[i] = *ecc_data2 % 2; | |
800 | *ecc_data2 = *ecc_data2 / 2; | |
801 | } | |
802 | ||
803 | for (i = 0; i < 8; i++) { | |
804 | comp1_bit[i] = *(ecc_data2 + 1) % 2; | |
805 | *(ecc_data2 + 1) = *(ecc_data2 + 1) / 2; | |
806 | } | |
807 | ||
808 | for (i = 0; i < 8; i++) { | |
809 | comp2_bit[i] = *(ecc_data2 + 2) % 2; | |
810 | *(ecc_data2 + 2) = *(ecc_data2 + 2) / 2; | |
811 | } | |
812 | ||
813 | for (i = 0; i < 6; i++) | |
814 | ecc_bit[i] = tmp2_bit[i + 2] ^ comp2_bit[i + 2]; | |
815 | ||
816 | for (i = 0; i < 8; i++) | |
817 | ecc_bit[i + 6] = tmp0_bit[i] ^ comp0_bit[i]; | |
818 | ||
819 | for (i = 0; i < 8; i++) | |
820 | ecc_bit[i + 14] = tmp1_bit[i] ^ comp1_bit[i]; | |
821 | ||
822 | ecc_bit[22] = tmp2_bit[0] ^ comp2_bit[0]; | |
823 | ecc_bit[23] = tmp2_bit[1] ^ comp2_bit[1]; | |
824 | ||
825 | for (i = 0; i < 24; i++) | |
826 | ecc_sum += ecc_bit[i]; | |
827 | ||
828 | switch (ecc_sum) { | |
829 | case 0: | |
830 | /* Not reached because this function is not called if | |
831 | * ECC values are equal | |
832 | */ | |
833 | return 0; | |
834 | ||
835 | case 1: | |
836 | /* Uncorrectable error */ | |
289c0522 | 837 | pr_debug("ECC UNCORRECTED_ERROR 1\n"); |
6e941192 | 838 | return -EBADMSG; |
67ce04bf VS |
839 | |
840 | case 11: | |
841 | /* UN-Correctable error */ | |
289c0522 | 842 | pr_debug("ECC UNCORRECTED_ERROR B\n"); |
6e941192 | 843 | return -EBADMSG; |
67ce04bf VS |
844 | |
845 | case 12: | |
846 | /* Correctable error */ | |
847 | find_byte = (ecc_bit[23] << 8) + | |
848 | (ecc_bit[21] << 7) + | |
849 | (ecc_bit[19] << 6) + | |
850 | (ecc_bit[17] << 5) + | |
851 | (ecc_bit[15] << 4) + | |
852 | (ecc_bit[13] << 3) + | |
853 | (ecc_bit[11] << 2) + | |
854 | (ecc_bit[9] << 1) + | |
855 | ecc_bit[7]; | |
856 | ||
857 | find_bit = (ecc_bit[5] << 2) + (ecc_bit[3] << 1) + ecc_bit[1]; | |
858 | ||
0a32a102 BN |
859 | pr_debug("Correcting single bit ECC error at offset: " |
860 | "%d, bit: %d\n", find_byte, find_bit); | |
67ce04bf VS |
861 | |
862 | page_data[find_byte] ^= (1 << find_bit); | |
863 | ||
74f1b724 | 864 | return 1; |
67ce04bf VS |
865 | default: |
866 | if (isEccFF) { | |
867 | if (ecc_data2[0] == 0 && | |
868 | ecc_data2[1] == 0 && | |
869 | ecc_data2[2] == 0) | |
870 | return 0; | |
871 | } | |
289c0522 | 872 | pr_debug("UNCORRECTED_ERROR default\n"); |
6e941192 | 873 | return -EBADMSG; |
67ce04bf VS |
874 | } |
875 | } | |
876 | ||
877 | /** | |
878 | * omap_correct_data - Compares the ECC read with HW generated ECC | |
879 | * @mtd: MTD device structure | |
880 | * @dat: page data | |
881 | * @read_ecc: ecc read from nand flash | |
882 | * @calc_ecc: ecc read from HW ECC registers | |
883 | * | |
884 | * Compares the ecc read from nand spare area with ECC registers values | |
74f1b724 JO |
885 | * and if ECC's mismatched, it will call 'omap_compare_ecc' for error |
886 | * detection and correction. If there are no errors, %0 is returned. If | |
887 | * there were errors and all of the errors were corrected, the number of | |
888 | * corrected errors is returned. If uncorrectable errors exist, %-1 is | |
889 | * returned. | |
67ce04bf VS |
890 | */ |
891 | static int omap_correct_data(struct mtd_info *mtd, u_char *dat, | |
892 | u_char *read_ecc, u_char *calc_ecc) | |
893 | { | |
4578ea9a | 894 | struct omap_nand_info *info = mtd_to_omap(mtd); |
67ce04bf | 895 | int blockCnt = 0, i = 0, ret = 0; |
74f1b724 | 896 | int stat = 0; |
67ce04bf VS |
897 | |
898 | /* Ex NAND_ECC_HW12_2048 */ | |
899 | if ((info->nand.ecc.mode == NAND_ECC_HW) && | |
900 | (info->nand.ecc.size == 2048)) | |
901 | blockCnt = 4; | |
902 | else | |
903 | blockCnt = 1; | |
904 | ||
905 | for (i = 0; i < blockCnt; i++) { | |
906 | if (memcmp(read_ecc, calc_ecc, 3) != 0) { | |
907 | ret = omap_compare_ecc(read_ecc, calc_ecc, dat); | |
908 | if (ret < 0) | |
909 | return ret; | |
74f1b724 JO |
910 | /* keep track of the number of corrected errors */ |
911 | stat += ret; | |
67ce04bf VS |
912 | } |
913 | read_ecc += 3; | |
914 | calc_ecc += 3; | |
915 | dat += 512; | |
916 | } | |
74f1b724 | 917 | return stat; |
67ce04bf VS |
918 | } |
919 | ||
920 | /** | |
921 | * omap_calcuate_ecc - Generate non-inverted ECC bytes. | |
922 | * @mtd: MTD device structure | |
923 | * @dat: The pointer to data on which ecc is computed | |
924 | * @ecc_code: The ecc_code buffer | |
925 | * | |
926 | * Using noninverted ECC can be considered ugly since writing a blank | |
927 | * page ie. padding will clear the ECC bytes. This is no problem as long | |
928 | * nobody is trying to write data on the seemingly unused page. Reading | |
929 | * an erased page will produce an ECC mismatch between generated and read | |
930 | * ECC bytes that has to be dealt with separately. | |
931 | */ | |
932 | static int omap_calculate_ecc(struct mtd_info *mtd, const u_char *dat, | |
933 | u_char *ecc_code) | |
934 | { | |
4578ea9a | 935 | struct omap_nand_info *info = mtd_to_omap(mtd); |
65b97cf6 AM |
936 | u32 val; |
937 | ||
938 | val = readl(info->reg.gpmc_ecc_config); | |
40ddbf50 | 939 | if (((val >> ECC_CONFIG_CS_SHIFT) & CS_MASK) != info->gpmc_cs) |
65b97cf6 AM |
940 | return -EINVAL; |
941 | ||
942 | /* read ecc result */ | |
943 | val = readl(info->reg.gpmc_ecc1_result); | |
944 | *ecc_code++ = val; /* P128e, ..., P1e */ | |
945 | *ecc_code++ = val >> 16; /* P128o, ..., P1o */ | |
946 | /* P2048o, P1024o, P512o, P256o, P2048e, P1024e, P512e, P256e */ | |
947 | *ecc_code++ = ((val >> 8) & 0x0f) | ((val >> 20) & 0xf0); | |
948 | ||
949 | return 0; | |
67ce04bf VS |
950 | } |
951 | ||
952 | /** | |
953 | * omap_enable_hwecc - This function enables the hardware ecc functionality | |
954 | * @mtd: MTD device structure | |
955 | * @mode: Read/Write mode | |
956 | */ | |
957 | static void omap_enable_hwecc(struct mtd_info *mtd, int mode) | |
958 | { | |
4578ea9a | 959 | struct omap_nand_info *info = mtd_to_omap(mtd); |
4bd4ebcc | 960 | struct nand_chip *chip = mtd_to_nand(mtd); |
67ce04bf | 961 | unsigned int dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0; |
65b97cf6 AM |
962 | u32 val; |
963 | ||
964 | /* clear ecc and enable bits */ | |
965 | val = ECCCLEAR | ECC1; | |
966 | writel(val, info->reg.gpmc_ecc_control); | |
67ce04bf | 967 | |
65b97cf6 AM |
968 | /* program ecc and result sizes */ |
969 | val = ((((info->nand.ecc.size >> 1) - 1) << ECCSIZE1_SHIFT) | | |
970 | ECC1RESULTSIZE); | |
971 | writel(val, info->reg.gpmc_ecc_size_config); | |
972 | ||
973 | switch (mode) { | |
974 | case NAND_ECC_READ: | |
975 | case NAND_ECC_WRITE: | |
976 | writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control); | |
977 | break; | |
978 | case NAND_ECC_READSYN: | |
979 | writel(ECCCLEAR, info->reg.gpmc_ecc_control); | |
980 | break; | |
981 | default: | |
982 | dev_info(&info->pdev->dev, | |
983 | "error: unrecognized Mode[%d]!\n", mode); | |
984 | break; | |
985 | } | |
67ce04bf | 986 | |
65b97cf6 AM |
987 | /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */ |
988 | val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1); | |
989 | writel(val, info->reg.gpmc_ecc_config); | |
67ce04bf | 990 | } |
2c01946c | 991 | |
67ce04bf VS |
992 | /** |
993 | * omap_wait - wait until the command is done | |
994 | * @mtd: MTD device structure | |
995 | * @chip: NAND Chip structure | |
996 | * | |
997 | * Wait function is called during Program and erase operations and | |
998 | * the way it is called from MTD layer, we should wait till the NAND | |
999 | * chip is ready after the programming/erase operation has completed. | |
1000 | * | |
1001 | * Erase can take up to 400ms and program up to 20ms according to | |
1002 | * general NAND and SmartMedia specs | |
1003 | */ | |
1004 | static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip) | |
1005 | { | |
4bd4ebcc | 1006 | struct nand_chip *this = mtd_to_nand(mtd); |
4578ea9a | 1007 | struct omap_nand_info *info = mtd_to_omap(mtd); |
67ce04bf | 1008 | unsigned long timeo = jiffies; |
a9c465f0 | 1009 | int status, state = this->state; |
67ce04bf VS |
1010 | |
1011 | if (state == FL_ERASING) | |
4ff6772b | 1012 | timeo += msecs_to_jiffies(400); |
67ce04bf | 1013 | else |
4ff6772b | 1014 | timeo += msecs_to_jiffies(20); |
67ce04bf | 1015 | |
65b97cf6 | 1016 | writeb(NAND_CMD_STATUS & 0xFF, info->reg.gpmc_nand_command); |
67ce04bf | 1017 | while (time_before(jiffies, timeo)) { |
65b97cf6 | 1018 | status = readb(info->reg.gpmc_nand_data); |
c276aca4 | 1019 | if (status & NAND_STATUS_READY) |
67ce04bf | 1020 | break; |
c276aca4 | 1021 | cond_resched(); |
67ce04bf | 1022 | } |
a9c465f0 | 1023 | |
4ea1e4ba | 1024 | status = readb(info->reg.gpmc_nand_data); |
67ce04bf VS |
1025 | return status; |
1026 | } | |
1027 | ||
1028 | /** | |
10f22ee3 | 1029 | * omap_dev_ready - checks the NAND Ready GPIO line |
67ce04bf | 1030 | * @mtd: MTD device structure |
10f22ee3 RQ |
1031 | * |
1032 | * Returns true if ready and false if busy. | |
67ce04bf VS |
1033 | */ |
1034 | static int omap_dev_ready(struct mtd_info *mtd) | |
1035 | { | |
4578ea9a | 1036 | struct omap_nand_info *info = mtd_to_omap(mtd); |
67ce04bf | 1037 | |
10f22ee3 | 1038 | return gpiod_get_value(info->ready_gpiod); |
67ce04bf VS |
1039 | } |
1040 | ||
0e618ef0 | 1041 | /** |
7c977c3e | 1042 | * omap_enable_hwecc_bch - Program GPMC to perform BCH ECC calculation |
0e618ef0 ID |
1043 | * @mtd: MTD device structure |
1044 | * @mode: Read/Write mode | |
62116e51 | 1045 | * |
0760e818 NMG |
1046 | * When using BCH with SW correction (i.e. no ELM), sector size is set |
1047 | * to 512 bytes and we use BCH_WRAPMODE_6 wrapping mode | |
1048 | * for both reading and writing with: | |
62116e51 PA |
1049 | * eccsize0 = 0 (no additional protected byte in spare area) |
1050 | * eccsize1 = 32 (skip 32 nibbles = 16 bytes per sector in spare area) | |
0e618ef0 | 1051 | */ |
7c977c3e | 1052 | static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode) |
0e618ef0 | 1053 | { |
16e69322 | 1054 | unsigned int bch_type; |
2ef9f3dd | 1055 | unsigned int dev_width, nsectors; |
4578ea9a | 1056 | struct omap_nand_info *info = mtd_to_omap(mtd); |
c5957a32 | 1057 | enum omap_ecc ecc_opt = info->ecc_opt; |
4bd4ebcc | 1058 | struct nand_chip *chip = mtd_to_nand(mtd); |
62116e51 PA |
1059 | u32 val, wr_mode; |
1060 | unsigned int ecc_size1, ecc_size0; | |
1061 | ||
c5957a32 PG |
1062 | /* GPMC configurations for calculating ECC */ |
1063 | switch (ecc_opt) { | |
1064 | case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW: | |
16e69322 PG |
1065 | bch_type = 0; |
1066 | nsectors = 1; | |
0760e818 NMG |
1067 | wr_mode = BCH_WRAPMODE_6; |
1068 | ecc_size0 = BCH_ECC_SIZE0; | |
1069 | ecc_size1 = BCH_ECC_SIZE1; | |
c5957a32 PG |
1070 | break; |
1071 | case OMAP_ECC_BCH4_CODE_HW: | |
16e69322 PG |
1072 | bch_type = 0; |
1073 | nsectors = chip->ecc.steps; | |
c5957a32 PG |
1074 | if (mode == NAND_ECC_READ) { |
1075 | wr_mode = BCH_WRAPMODE_1; | |
1076 | ecc_size0 = BCH4R_ECC_SIZE0; | |
1077 | ecc_size1 = BCH4R_ECC_SIZE1; | |
1078 | } else { | |
1079 | wr_mode = BCH_WRAPMODE_6; | |
1080 | ecc_size0 = BCH_ECC_SIZE0; | |
1081 | ecc_size1 = BCH_ECC_SIZE1; | |
1082 | } | |
1083 | break; | |
1084 | case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW: | |
16e69322 PG |
1085 | bch_type = 1; |
1086 | nsectors = 1; | |
0760e818 NMG |
1087 | wr_mode = BCH_WRAPMODE_6; |
1088 | ecc_size0 = BCH_ECC_SIZE0; | |
1089 | ecc_size1 = BCH_ECC_SIZE1; | |
c5957a32 PG |
1090 | break; |
1091 | case OMAP_ECC_BCH8_CODE_HW: | |
16e69322 PG |
1092 | bch_type = 1; |
1093 | nsectors = chip->ecc.steps; | |
c5957a32 PG |
1094 | if (mode == NAND_ECC_READ) { |
1095 | wr_mode = BCH_WRAPMODE_1; | |
1096 | ecc_size0 = BCH8R_ECC_SIZE0; | |
1097 | ecc_size1 = BCH8R_ECC_SIZE1; | |
1098 | } else { | |
1099 | wr_mode = BCH_WRAPMODE_6; | |
1100 | ecc_size0 = BCH_ECC_SIZE0; | |
1101 | ecc_size1 = BCH_ECC_SIZE1; | |
1102 | } | |
1103 | break; | |
9748fff9 | 1104 | case OMAP_ECC_BCH16_CODE_HW: |
1105 | bch_type = 0x2; | |
1106 | nsectors = chip->ecc.steps; | |
1107 | if (mode == NAND_ECC_READ) { | |
1108 | wr_mode = 0x01; | |
1109 | ecc_size0 = 52; /* ECC bits in nibbles per sector */ | |
1110 | ecc_size1 = 0; /* non-ECC bits in nibbles per sector */ | |
1111 | } else { | |
1112 | wr_mode = 0x01; | |
1113 | ecc_size0 = 0; /* extra bits in nibbles per sector */ | |
1114 | ecc_size1 = 52; /* OOB bits in nibbles per sector */ | |
1115 | } | |
1116 | break; | |
c5957a32 PG |
1117 | default: |
1118 | return; | |
1119 | } | |
2ef9f3dd AM |
1120 | |
1121 | writel(ECC1, info->reg.gpmc_ecc_control); | |
1122 | ||
62116e51 PA |
1123 | /* Configure ecc size for BCH */ |
1124 | val = (ecc_size1 << ECCSIZE1_SHIFT) | (ecc_size0 << ECCSIZE0_SHIFT); | |
2ef9f3dd AM |
1125 | writel(val, info->reg.gpmc_ecc_size_config); |
1126 | ||
62116e51 PA |
1127 | dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0; |
1128 | ||
2ef9f3dd AM |
1129 | /* BCH configuration */ |
1130 | val = ((1 << 16) | /* enable BCH */ | |
16e69322 | 1131 | (bch_type << 12) | /* BCH4/BCH8/BCH16 */ |
62116e51 | 1132 | (wr_mode << 8) | /* wrap mode */ |
2ef9f3dd AM |
1133 | (dev_width << 7) | /* bus width */ |
1134 | (((nsectors-1) & 0x7) << 4) | /* number of sectors */ | |
1135 | (info->gpmc_cs << 1) | /* ECC CS */ | |
1136 | (0x1)); /* enable ECC */ | |
1137 | ||
1138 | writel(val, info->reg.gpmc_ecc_config); | |
1139 | ||
62116e51 | 1140 | /* Clear ecc and enable bits */ |
2ef9f3dd | 1141 | writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control); |
0e618ef0 | 1142 | } |
7c977c3e | 1143 | |
2c9f2365 | 1144 | static u8 bch4_polynomial[] = {0x28, 0x13, 0xcc, 0x39, 0x96, 0xac, 0x7f}; |
7bcd1dca PG |
1145 | static u8 bch8_polynomial[] = {0xef, 0x51, 0x2e, 0x09, 0xed, 0x93, 0x9a, 0xc2, |
1146 | 0x97, 0x79, 0xe5, 0x24, 0xb5}; | |
0e618ef0 | 1147 | |
62116e51 | 1148 | /** |
a4c7ca00 | 1149 | * omap_calculate_ecc_bch - Generate bytes of ECC bytes |
62116e51 PA |
1150 | * @mtd: MTD device structure |
1151 | * @dat: The pointer to data on which ecc is computed | |
1152 | * @ecc_code: The ecc_code buffer | |
1153 | * | |
1154 | * Support calculating of BCH4/8 ecc vectors for the page | |
1155 | */ | |
a4c7ca00 | 1156 | static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd, |
f5dc06fb | 1157 | const u_char *dat, u_char *ecc_calc) |
62116e51 | 1158 | { |
4578ea9a | 1159 | struct omap_nand_info *info = mtd_to_omap(mtd); |
f5dc06fb PG |
1160 | int eccbytes = info->nand.ecc.bytes; |
1161 | struct gpmc_nand_regs *gpmc_regs = &info->reg; | |
1162 | u8 *ecc_code; | |
62116e51 | 1163 | unsigned long nsectors, bch_val1, bch_val2, bch_val3, bch_val4; |
9748fff9 | 1164 | u32 val; |
2913aae5 | 1165 | int i, j; |
62116e51 PA |
1166 | |
1167 | nsectors = ((readl(info->reg.gpmc_ecc_config) >> 4) & 0x7) + 1; | |
62116e51 | 1168 | for (i = 0; i < nsectors; i++) { |
f5dc06fb PG |
1169 | ecc_code = ecc_calc; |
1170 | switch (info->ecc_opt) { | |
7bcd1dca | 1171 | case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW: |
f5dc06fb PG |
1172 | case OMAP_ECC_BCH8_CODE_HW: |
1173 | bch_val1 = readl(gpmc_regs->gpmc_bch_result0[i]); | |
1174 | bch_val2 = readl(gpmc_regs->gpmc_bch_result1[i]); | |
1175 | bch_val3 = readl(gpmc_regs->gpmc_bch_result2[i]); | |
1176 | bch_val4 = readl(gpmc_regs->gpmc_bch_result3[i]); | |
62116e51 PA |
1177 | *ecc_code++ = (bch_val4 & 0xFF); |
1178 | *ecc_code++ = ((bch_val3 >> 24) & 0xFF); | |
1179 | *ecc_code++ = ((bch_val3 >> 16) & 0xFF); | |
1180 | *ecc_code++ = ((bch_val3 >> 8) & 0xFF); | |
1181 | *ecc_code++ = (bch_val3 & 0xFF); | |
1182 | *ecc_code++ = ((bch_val2 >> 24) & 0xFF); | |
1183 | *ecc_code++ = ((bch_val2 >> 16) & 0xFF); | |
1184 | *ecc_code++ = ((bch_val2 >> 8) & 0xFF); | |
1185 | *ecc_code++ = (bch_val2 & 0xFF); | |
1186 | *ecc_code++ = ((bch_val1 >> 24) & 0xFF); | |
1187 | *ecc_code++ = ((bch_val1 >> 16) & 0xFF); | |
1188 | *ecc_code++ = ((bch_val1 >> 8) & 0xFF); | |
1189 | *ecc_code++ = (bch_val1 & 0xFF); | |
f5dc06fb | 1190 | break; |
2c9f2365 | 1191 | case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW: |
f5dc06fb PG |
1192 | case OMAP_ECC_BCH4_CODE_HW: |
1193 | bch_val1 = readl(gpmc_regs->gpmc_bch_result0[i]); | |
1194 | bch_val2 = readl(gpmc_regs->gpmc_bch_result1[i]); | |
62116e51 PA |
1195 | *ecc_code++ = ((bch_val2 >> 12) & 0xFF); |
1196 | *ecc_code++ = ((bch_val2 >> 4) & 0xFF); | |
1197 | *ecc_code++ = ((bch_val2 & 0xF) << 4) | | |
1198 | ((bch_val1 >> 28) & 0xF); | |
1199 | *ecc_code++ = ((bch_val1 >> 20) & 0xFF); | |
1200 | *ecc_code++ = ((bch_val1 >> 12) & 0xFF); | |
1201 | *ecc_code++ = ((bch_val1 >> 4) & 0xFF); | |
1202 | *ecc_code++ = ((bch_val1 & 0xF) << 4); | |
f5dc06fb | 1203 | break; |
9748fff9 | 1204 | case OMAP_ECC_BCH16_CODE_HW: |
1205 | val = readl(gpmc_regs->gpmc_bch_result6[i]); | |
1206 | ecc_code[0] = ((val >> 8) & 0xFF); | |
1207 | ecc_code[1] = ((val >> 0) & 0xFF); | |
1208 | val = readl(gpmc_regs->gpmc_bch_result5[i]); | |
1209 | ecc_code[2] = ((val >> 24) & 0xFF); | |
1210 | ecc_code[3] = ((val >> 16) & 0xFF); | |
1211 | ecc_code[4] = ((val >> 8) & 0xFF); | |
1212 | ecc_code[5] = ((val >> 0) & 0xFF); | |
1213 | val = readl(gpmc_regs->gpmc_bch_result4[i]); | |
1214 | ecc_code[6] = ((val >> 24) & 0xFF); | |
1215 | ecc_code[7] = ((val >> 16) & 0xFF); | |
1216 | ecc_code[8] = ((val >> 8) & 0xFF); | |
1217 | ecc_code[9] = ((val >> 0) & 0xFF); | |
1218 | val = readl(gpmc_regs->gpmc_bch_result3[i]); | |
1219 | ecc_code[10] = ((val >> 24) & 0xFF); | |
1220 | ecc_code[11] = ((val >> 16) & 0xFF); | |
1221 | ecc_code[12] = ((val >> 8) & 0xFF); | |
1222 | ecc_code[13] = ((val >> 0) & 0xFF); | |
1223 | val = readl(gpmc_regs->gpmc_bch_result2[i]); | |
1224 | ecc_code[14] = ((val >> 24) & 0xFF); | |
1225 | ecc_code[15] = ((val >> 16) & 0xFF); | |
1226 | ecc_code[16] = ((val >> 8) & 0xFF); | |
1227 | ecc_code[17] = ((val >> 0) & 0xFF); | |
1228 | val = readl(gpmc_regs->gpmc_bch_result1[i]); | |
1229 | ecc_code[18] = ((val >> 24) & 0xFF); | |
1230 | ecc_code[19] = ((val >> 16) & 0xFF); | |
1231 | ecc_code[20] = ((val >> 8) & 0xFF); | |
1232 | ecc_code[21] = ((val >> 0) & 0xFF); | |
1233 | val = readl(gpmc_regs->gpmc_bch_result0[i]); | |
1234 | ecc_code[22] = ((val >> 24) & 0xFF); | |
1235 | ecc_code[23] = ((val >> 16) & 0xFF); | |
1236 | ecc_code[24] = ((val >> 8) & 0xFF); | |
1237 | ecc_code[25] = ((val >> 0) & 0xFF); | |
1238 | break; | |
f5dc06fb PG |
1239 | default: |
1240 | return -EINVAL; | |
62116e51 | 1241 | } |
f5dc06fb PG |
1242 | |
1243 | /* ECC scheme specific syndrome customizations */ | |
1244 | switch (info->ecc_opt) { | |
2c9f2365 PG |
1245 | case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW: |
1246 | /* Add constant polynomial to remainder, so that | |
1247 | * ECC of blank pages results in 0x0 on reading back */ | |
2913aae5 TJ |
1248 | for (j = 0; j < eccbytes; j++) |
1249 | ecc_calc[j] ^= bch4_polynomial[j]; | |
2c9f2365 | 1250 | break; |
f5dc06fb PG |
1251 | case OMAP_ECC_BCH4_CODE_HW: |
1252 | /* Set 8th ECC byte as 0x0 for ROM compatibility */ | |
1253 | ecc_calc[eccbytes - 1] = 0x0; | |
1254 | break; | |
7bcd1dca PG |
1255 | case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW: |
1256 | /* Add constant polynomial to remainder, so that | |
1257 | * ECC of blank pages results in 0x0 on reading back */ | |
2913aae5 TJ |
1258 | for (j = 0; j < eccbytes; j++) |
1259 | ecc_calc[j] ^= bch8_polynomial[j]; | |
7bcd1dca | 1260 | break; |
f5dc06fb PG |
1261 | case OMAP_ECC_BCH8_CODE_HW: |
1262 | /* Set 14th ECC byte as 0x0 for ROM compatibility */ | |
1263 | ecc_calc[eccbytes - 1] = 0x0; | |
1264 | break; | |
9748fff9 | 1265 | case OMAP_ECC_BCH16_CODE_HW: |
1266 | break; | |
f5dc06fb PG |
1267 | default: |
1268 | return -EINVAL; | |
1269 | } | |
1270 | ||
1271 | ecc_calc += eccbytes; | |
62116e51 PA |
1272 | } |
1273 | ||
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | /** | |
1278 | * erased_sector_bitflips - count bit flips | |
1279 | * @data: data sector buffer | |
1280 | * @oob: oob buffer | |
1281 | * @info: omap_nand_info | |
1282 | * | |
1283 | * Check the bit flips in erased page falls below correctable level. | |
1284 | * If falls below, report the page as erased with correctable bit | |
1285 | * flip, else report as uncorrectable page. | |
1286 | */ | |
1287 | static int erased_sector_bitflips(u_char *data, u_char *oob, | |
1288 | struct omap_nand_info *info) | |
1289 | { | |
1290 | int flip_bits = 0, i; | |
1291 | ||
1292 | for (i = 0; i < info->nand.ecc.size; i++) { | |
1293 | flip_bits += hweight8(~data[i]); | |
1294 | if (flip_bits > info->nand.ecc.strength) | |
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | for (i = 0; i < info->nand.ecc.bytes - 1; i++) { | |
1299 | flip_bits += hweight8(~oob[i]); | |
1300 | if (flip_bits > info->nand.ecc.strength) | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * Bit flips falls in correctable level. | |
1306 | * Fill data area with 0xFF | |
1307 | */ | |
1308 | if (flip_bits) { | |
1309 | memset(data, 0xFF, info->nand.ecc.size); | |
1310 | memset(oob, 0xFF, info->nand.ecc.bytes); | |
1311 | } | |
1312 | ||
1313 | return flip_bits; | |
1314 | } | |
1315 | ||
1316 | /** | |
1317 | * omap_elm_correct_data - corrects page data area in case error reported | |
1318 | * @mtd: MTD device structure | |
1319 | * @data: page data | |
1320 | * @read_ecc: ecc read from nand flash | |
1321 | * @calc_ecc: ecc read from HW ECC registers | |
1322 | * | |
1323 | * Calculated ecc vector reported as zero in case of non-error pages. | |
78f43c53 PG |
1324 | * In case of non-zero ecc vector, first filter out erased-pages, and |
1325 | * then process data via ELM to detect bit-flips. | |
62116e51 PA |
1326 | */ |
1327 | static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data, | |
1328 | u_char *read_ecc, u_char *calc_ecc) | |
1329 | { | |
4578ea9a | 1330 | struct omap_nand_info *info = mtd_to_omap(mtd); |
de0a4d69 | 1331 | struct nand_ecc_ctrl *ecc = &info->nand.ecc; |
62116e51 PA |
1332 | int eccsteps = info->nand.ecc.steps; |
1333 | int i , j, stat = 0; | |
de0a4d69 | 1334 | int eccflag, actual_eccbytes; |
62116e51 PA |
1335 | struct elm_errorvec err_vec[ERROR_VECTOR_MAX]; |
1336 | u_char *ecc_vec = calc_ecc; | |
1337 | u_char *spare_ecc = read_ecc; | |
1338 | u_char *erased_ecc_vec; | |
78f43c53 PG |
1339 | u_char *buf; |
1340 | int bitflip_count; | |
62116e51 | 1341 | bool is_error_reported = false; |
b08e1f63 | 1342 | u32 bit_pos, byte_pos, error_max, pos; |
13fbe064 | 1343 | int err; |
62116e51 | 1344 | |
de0a4d69 PG |
1345 | switch (info->ecc_opt) { |
1346 | case OMAP_ECC_BCH4_CODE_HW: | |
1347 | /* omit 7th ECC byte reserved for ROM code compatibility */ | |
1348 | actual_eccbytes = ecc->bytes - 1; | |
78f43c53 | 1349 | erased_ecc_vec = bch4_vector; |
de0a4d69 PG |
1350 | break; |
1351 | case OMAP_ECC_BCH8_CODE_HW: | |
1352 | /* omit 14th ECC byte reserved for ROM code compatibility */ | |
1353 | actual_eccbytes = ecc->bytes - 1; | |
78f43c53 | 1354 | erased_ecc_vec = bch8_vector; |
de0a4d69 | 1355 | break; |
9748fff9 | 1356 | case OMAP_ECC_BCH16_CODE_HW: |
1357 | actual_eccbytes = ecc->bytes; | |
1358 | erased_ecc_vec = bch16_vector; | |
1359 | break; | |
de0a4d69 | 1360 | default: |
d2f08c75 | 1361 | dev_err(&info->pdev->dev, "invalid driver configuration\n"); |
de0a4d69 PG |
1362 | return -EINVAL; |
1363 | } | |
1364 | ||
62116e51 PA |
1365 | /* Initialize elm error vector to zero */ |
1366 | memset(err_vec, 0, sizeof(err_vec)); | |
1367 | ||
62116e51 PA |
1368 | for (i = 0; i < eccsteps ; i++) { |
1369 | eccflag = 0; /* initialize eccflag */ | |
1370 | ||
1371 | /* | |
1372 | * Check any error reported, | |
1373 | * In case of error, non zero ecc reported. | |
1374 | */ | |
de0a4d69 | 1375 | for (j = 0; j < actual_eccbytes; j++) { |
62116e51 PA |
1376 | if (calc_ecc[j] != 0) { |
1377 | eccflag = 1; /* non zero ecc, error present */ | |
1378 | break; | |
1379 | } | |
1380 | } | |
1381 | ||
1382 | if (eccflag == 1) { | |
78f43c53 PG |
1383 | if (memcmp(calc_ecc, erased_ecc_vec, |
1384 | actual_eccbytes) == 0) { | |
62116e51 | 1385 | /* |
78f43c53 PG |
1386 | * calc_ecc[] matches pattern for ECC(all 0xff) |
1387 | * so this is definitely an erased-page | |
62116e51 | 1388 | */ |
62116e51 | 1389 | } else { |
78f43c53 PG |
1390 | buf = &data[info->nand.ecc.size * i]; |
1391 | /* | |
1392 | * count number of 0-bits in read_buf. | |
1393 | * This check can be removed once a similar | |
1394 | * check is introduced in generic NAND driver | |
1395 | */ | |
1396 | bitflip_count = erased_sector_bitflips( | |
1397 | buf, read_ecc, info); | |
1398 | if (bitflip_count) { | |
1399 | /* | |
1400 | * number of 0-bits within ECC limits | |
1401 | * So this may be an erased-page | |
1402 | */ | |
1403 | stat += bitflip_count; | |
1404 | } else { | |
1405 | /* | |
1406 | * Too many 0-bits. It may be a | |
1407 | * - programmed-page, OR | |
1408 | * - erased-page with many bit-flips | |
1409 | * So this page requires check by ELM | |
1410 | */ | |
1411 | err_vec[i].error_reported = true; | |
1412 | is_error_reported = true; | |
62116e51 PA |
1413 | } |
1414 | } | |
1415 | } | |
1416 | ||
1417 | /* Update the ecc vector */ | |
de0a4d69 PG |
1418 | calc_ecc += ecc->bytes; |
1419 | read_ecc += ecc->bytes; | |
62116e51 PA |
1420 | } |
1421 | ||
1422 | /* Check if any error reported */ | |
1423 | if (!is_error_reported) | |
f306e8c3 | 1424 | return stat; |
62116e51 PA |
1425 | |
1426 | /* Decode BCH error using ELM module */ | |
1427 | elm_decode_bch_error_page(info->elm_dev, ecc_vec, err_vec); | |
1428 | ||
13fbe064 | 1429 | err = 0; |
62116e51 | 1430 | for (i = 0; i < eccsteps; i++) { |
13fbe064 | 1431 | if (err_vec[i].error_uncorrectable) { |
d2f08c75 EG |
1432 | dev_err(&info->pdev->dev, |
1433 | "uncorrectable bit-flips found\n"); | |
13fbe064 PG |
1434 | err = -EBADMSG; |
1435 | } else if (err_vec[i].error_reported) { | |
62116e51 | 1436 | for (j = 0; j < err_vec[i].error_count; j++) { |
b08e1f63 PG |
1437 | switch (info->ecc_opt) { |
1438 | case OMAP_ECC_BCH4_CODE_HW: | |
1439 | /* Add 4 bits to take care of padding */ | |
62116e51 PA |
1440 | pos = err_vec[i].error_loc[j] + |
1441 | BCH4_BIT_PAD; | |
b08e1f63 PG |
1442 | break; |
1443 | case OMAP_ECC_BCH8_CODE_HW: | |
9748fff9 | 1444 | case OMAP_ECC_BCH16_CODE_HW: |
b08e1f63 PG |
1445 | pos = err_vec[i].error_loc[j]; |
1446 | break; | |
1447 | default: | |
1448 | return -EINVAL; | |
1449 | } | |
1450 | error_max = (ecc->size + actual_eccbytes) * 8; | |
62116e51 PA |
1451 | /* Calculate bit position of error */ |
1452 | bit_pos = pos % 8; | |
1453 | ||
1454 | /* Calculate byte position of error */ | |
1455 | byte_pos = (error_max - pos - 1) / 8; | |
1456 | ||
1457 | if (pos < error_max) { | |
13fbe064 PG |
1458 | if (byte_pos < 512) { |
1459 | pr_debug("bitflip@dat[%d]=%x\n", | |
1460 | byte_pos, data[byte_pos]); | |
62116e51 | 1461 | data[byte_pos] ^= 1 << bit_pos; |
13fbe064 PG |
1462 | } else { |
1463 | pr_debug("bitflip@oob[%d]=%x\n", | |
1464 | (byte_pos - 512), | |
1465 | spare_ecc[byte_pos - 512]); | |
62116e51 PA |
1466 | spare_ecc[byte_pos - 512] ^= |
1467 | 1 << bit_pos; | |
13fbe064 PG |
1468 | } |
1469 | } else { | |
d2f08c75 EG |
1470 | dev_err(&info->pdev->dev, |
1471 | "invalid bit-flip @ %d:%d\n", | |
1472 | byte_pos, bit_pos); | |
13fbe064 | 1473 | err = -EBADMSG; |
62116e51 | 1474 | } |
62116e51 PA |
1475 | } |
1476 | } | |
1477 | ||
1478 | /* Update number of correctable errors */ | |
1479 | stat += err_vec[i].error_count; | |
1480 | ||
1481 | /* Update page data with sector size */ | |
b08e1f63 | 1482 | data += ecc->size; |
de0a4d69 | 1483 | spare_ecc += ecc->bytes; |
62116e51 PA |
1484 | } |
1485 | ||
13fbe064 | 1486 | return (err) ? err : stat; |
62116e51 PA |
1487 | } |
1488 | ||
62116e51 PA |
1489 | /** |
1490 | * omap_write_page_bch - BCH ecc based write page function for entire page | |
1491 | * @mtd: mtd info structure | |
1492 | * @chip: nand chip info structure | |
1493 | * @buf: data buffer | |
1494 | * @oob_required: must write chip->oob_poi to OOB | |
45aaeff9 | 1495 | * @page: page |
62116e51 PA |
1496 | * |
1497 | * Custom write page method evolved to support multi sector writing in one shot | |
1498 | */ | |
1499 | static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip, | |
45aaeff9 | 1500 | const uint8_t *buf, int oob_required, int page) |
62116e51 PA |
1501 | { |
1502 | int i; | |
1503 | uint8_t *ecc_calc = chip->buffers->ecccalc; | |
1504 | uint32_t *eccpos = chip->ecc.layout->eccpos; | |
1505 | ||
1506 | /* Enable GPMC ecc engine */ | |
1507 | chip->ecc.hwctl(mtd, NAND_ECC_WRITE); | |
1508 | ||
1509 | /* Write data */ | |
1510 | chip->write_buf(mtd, buf, mtd->writesize); | |
1511 | ||
1512 | /* Update ecc vector from GPMC result registers */ | |
1513 | chip->ecc.calculate(mtd, buf, &ecc_calc[0]); | |
1514 | ||
1515 | for (i = 0; i < chip->ecc.total; i++) | |
1516 | chip->oob_poi[eccpos[i]] = ecc_calc[i]; | |
1517 | ||
1518 | /* Write ecc vector to OOB area */ | |
1519 | chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); | |
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | /** | |
1524 | * omap_read_page_bch - BCH ecc based page read function for entire page | |
1525 | * @mtd: mtd info structure | |
1526 | * @chip: nand chip info structure | |
1527 | * @buf: buffer to store read data | |
1528 | * @oob_required: caller requires OOB data read to chip->oob_poi | |
1529 | * @page: page number to read | |
1530 | * | |
1531 | * For BCH ecc scheme, GPMC used for syndrome calculation and ELM module | |
1532 | * used for error correction. | |
1533 | * Custom method evolved to support ELM error correction & multi sector | |
1534 | * reading. On reading page data area is read along with OOB data with | |
1535 | * ecc engine enabled. ecc vector updated after read of OOB data. | |
1536 | * For non error pages ecc vector reported as zero. | |
1537 | */ | |
1538 | static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip, | |
1539 | uint8_t *buf, int oob_required, int page) | |
1540 | { | |
1541 | uint8_t *ecc_calc = chip->buffers->ecccalc; | |
1542 | uint8_t *ecc_code = chip->buffers->ecccode; | |
1543 | uint32_t *eccpos = chip->ecc.layout->eccpos; | |
1544 | uint8_t *oob = &chip->oob_poi[eccpos[0]]; | |
1545 | uint32_t oob_pos = mtd->writesize + chip->ecc.layout->eccpos[0]; | |
1546 | int stat; | |
1547 | unsigned int max_bitflips = 0; | |
1548 | ||
1549 | /* Enable GPMC ecc engine */ | |
1550 | chip->ecc.hwctl(mtd, NAND_ECC_READ); | |
1551 | ||
1552 | /* Read data */ | |
1553 | chip->read_buf(mtd, buf, mtd->writesize); | |
1554 | ||
1555 | /* Read oob bytes */ | |
1556 | chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, -1); | |
1557 | chip->read_buf(mtd, oob, chip->ecc.total); | |
1558 | ||
1559 | /* Calculate ecc bytes */ | |
1560 | chip->ecc.calculate(mtd, buf, ecc_calc); | |
1561 | ||
1562 | memcpy(ecc_code, &chip->oob_poi[eccpos[0]], chip->ecc.total); | |
1563 | ||
1564 | stat = chip->ecc.correct(mtd, buf, ecc_code, ecc_calc); | |
1565 | ||
1566 | if (stat < 0) { | |
1567 | mtd->ecc_stats.failed++; | |
1568 | } else { | |
1569 | mtd->ecc_stats.corrected += stat; | |
1570 | max_bitflips = max_t(unsigned int, max_bitflips, stat); | |
1571 | } | |
1572 | ||
1573 | return max_bitflips; | |
1574 | } | |
1575 | ||
0e618ef0 | 1576 | /** |
a919e511 PG |
1577 | * is_elm_present - checks for presence of ELM module by scanning DT nodes |
1578 | * @omap_nand_info: NAND device structure containing platform data | |
0e618ef0 | 1579 | */ |
93af53b8 EG |
1580 | static bool is_elm_present(struct omap_nand_info *info, |
1581 | struct device_node *elm_node) | |
0e618ef0 | 1582 | { |
a919e511 | 1583 | struct platform_device *pdev; |
93af53b8 | 1584 | |
a919e511 PG |
1585 | /* check whether elm-id is passed via DT */ |
1586 | if (!elm_node) { | |
d2f08c75 | 1587 | dev_err(&info->pdev->dev, "ELM devicetree node not found\n"); |
93af53b8 | 1588 | return false; |
a919e511 PG |
1589 | } |
1590 | pdev = of_find_device_by_node(elm_node); | |
1591 | /* check whether ELM device is registered */ | |
1592 | if (!pdev) { | |
d2f08c75 | 1593 | dev_err(&info->pdev->dev, "ELM device not found\n"); |
93af53b8 | 1594 | return false; |
0e618ef0 | 1595 | } |
a919e511 PG |
1596 | /* ELM module available, now configure it */ |
1597 | info->elm_dev = &pdev->dev; | |
93af53b8 EG |
1598 | return true; |
1599 | } | |
3f4eb14b | 1600 | |
93af53b8 EG |
1601 | static bool omap2_nand_ecc_check(struct omap_nand_info *info, |
1602 | struct omap_nand_platform_data *pdata) | |
1603 | { | |
1604 | bool ecc_needs_bch, ecc_needs_omap_bch, ecc_needs_elm; | |
1605 | ||
1606 | switch (info->ecc_opt) { | |
1607 | case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW: | |
1608 | case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW: | |
1609 | ecc_needs_omap_bch = false; | |
1610 | ecc_needs_bch = true; | |
1611 | ecc_needs_elm = false; | |
1612 | break; | |
1613 | case OMAP_ECC_BCH4_CODE_HW: | |
1614 | case OMAP_ECC_BCH8_CODE_HW: | |
1615 | case OMAP_ECC_BCH16_CODE_HW: | |
1616 | ecc_needs_omap_bch = true; | |
1617 | ecc_needs_bch = false; | |
1618 | ecc_needs_elm = true; | |
1619 | break; | |
1620 | default: | |
1621 | ecc_needs_omap_bch = false; | |
1622 | ecc_needs_bch = false; | |
1623 | ecc_needs_elm = false; | |
1624 | break; | |
1625 | } | |
1626 | ||
1627 | if (ecc_needs_bch && !IS_ENABLED(CONFIG_MTD_NAND_ECC_BCH)) { | |
1628 | dev_err(&info->pdev->dev, | |
1629 | "CONFIG_MTD_NAND_ECC_BCH not enabled\n"); | |
1630 | return false; | |
1631 | } | |
1632 | if (ecc_needs_omap_bch && !IS_ENABLED(CONFIG_MTD_NAND_OMAP_BCH)) { | |
1633 | dev_err(&info->pdev->dev, | |
1634 | "CONFIG_MTD_NAND_OMAP_BCH not enabled\n"); | |
1635 | return false; | |
1636 | } | |
01b95fc6 | 1637 | if (ecc_needs_elm && !is_elm_present(info, info->elm_of_node)) { |
93af53b8 EG |
1638 | dev_err(&info->pdev->dev, "ELM not available\n"); |
1639 | return false; | |
1640 | } | |
1641 | ||
1642 | return true; | |
0e618ef0 ID |
1643 | } |
1644 | ||
c9711ec5 RQ |
1645 | static const char * const nand_xfer_types[] = { |
1646 | [NAND_OMAP_PREFETCH_POLLED] = "prefetch-polled", | |
1647 | [NAND_OMAP_POLLED] = "polled", | |
1648 | [NAND_OMAP_PREFETCH_DMA] = "prefetch-dma", | |
1649 | [NAND_OMAP_PREFETCH_IRQ] = "prefetch-irq", | |
1650 | }; | |
1651 | ||
1652 | static int omap_get_dt_info(struct device *dev, struct omap_nand_info *info) | |
1653 | { | |
1654 | struct device_node *child = dev->of_node; | |
1655 | int i; | |
1656 | const char *s; | |
1657 | u32 cs; | |
1658 | ||
1659 | if (of_property_read_u32(child, "reg", &cs) < 0) { | |
1660 | dev_err(dev, "reg not found in DT\n"); | |
1661 | return -EINVAL; | |
1662 | } | |
1663 | ||
1664 | info->gpmc_cs = cs; | |
1665 | ||
1666 | /* detect availability of ELM module. Won't be present pre-OMAP4 */ | |
1667 | info->elm_of_node = of_parse_phandle(child, "ti,elm-id", 0); | |
1668 | if (!info->elm_of_node) | |
1669 | dev_dbg(dev, "ti,elm-id not in DT\n"); | |
1670 | ||
1671 | /* select ecc-scheme for NAND */ | |
1672 | if (of_property_read_string(child, "ti,nand-ecc-opt", &s)) { | |
1673 | dev_err(dev, "ti,nand-ecc-opt not found\n"); | |
1674 | return -EINVAL; | |
1675 | } | |
1676 | ||
1677 | if (!strcmp(s, "sw")) { | |
1678 | info->ecc_opt = OMAP_ECC_HAM1_CODE_SW; | |
1679 | } else if (!strcmp(s, "ham1") || | |
1680 | !strcmp(s, "hw") || !strcmp(s, "hw-romcode")) { | |
1681 | info->ecc_opt = OMAP_ECC_HAM1_CODE_HW; | |
1682 | } else if (!strcmp(s, "bch4")) { | |
1683 | if (info->elm_of_node) | |
1684 | info->ecc_opt = OMAP_ECC_BCH4_CODE_HW; | |
1685 | else | |
1686 | info->ecc_opt = OMAP_ECC_BCH4_CODE_HW_DETECTION_SW; | |
1687 | } else if (!strcmp(s, "bch8")) { | |
1688 | if (info->elm_of_node) | |
1689 | info->ecc_opt = OMAP_ECC_BCH8_CODE_HW; | |
1690 | else | |
1691 | info->ecc_opt = OMAP_ECC_BCH8_CODE_HW_DETECTION_SW; | |
1692 | } else if (!strcmp(s, "bch16")) { | |
1693 | info->ecc_opt = OMAP_ECC_BCH16_CODE_HW; | |
1694 | } else { | |
1695 | dev_err(dev, "unrecognized value for ti,nand-ecc-opt\n"); | |
1696 | return -EINVAL; | |
1697 | } | |
1698 | ||
1699 | /* select data transfer mode */ | |
1700 | if (!of_property_read_string(child, "ti,nand-xfer-type", &s)) { | |
1701 | for (i = 0; i < ARRAY_SIZE(nand_xfer_types); i++) { | |
1702 | if (!strcasecmp(s, nand_xfer_types[i])) { | |
1703 | info->xfer_type = i; | |
1704 | goto next; | |
1705 | } | |
1706 | } | |
1707 | ||
1708 | dev_err(dev, "unrecognized value for ti,nand-xfer-type\n"); | |
1709 | return -EINVAL; | |
1710 | } | |
1711 | ||
1712 | next: | |
1713 | of_get_nand_on_flash_bbt(child); | |
1714 | ||
1715 | if (of_get_nand_bus_width(child) == 16) | |
1716 | info->devsize = NAND_BUSWIDTH_16; | |
1717 | ||
1718 | return 0; | |
1719 | } | |
1720 | ||
06f25510 | 1721 | static int omap_nand_probe(struct platform_device *pdev) |
67ce04bf VS |
1722 | { |
1723 | struct omap_nand_info *info; | |
c9711ec5 | 1724 | struct omap_nand_platform_data *pdata = NULL; |
633deb58 PG |
1725 | struct mtd_info *mtd; |
1726 | struct nand_chip *nand_chip; | |
b491da72 | 1727 | struct nand_ecclayout *ecclayout; |
67ce04bf | 1728 | int err; |
b491da72 | 1729 | int i; |
633deb58 PG |
1730 | dma_cap_mask_t mask; |
1731 | unsigned sig; | |
eae39cb4 | 1732 | unsigned oob_index; |
9c4c2f8b | 1733 | struct resource *res; |
c9711ec5 | 1734 | struct device *dev = &pdev->dev; |
67ce04bf | 1735 | |
70ba6d71 PG |
1736 | info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info), |
1737 | GFP_KERNEL); | |
67ce04bf VS |
1738 | if (!info) |
1739 | return -ENOMEM; | |
1740 | ||
c9711ec5 | 1741 | info->pdev = pdev; |
67ce04bf | 1742 | |
c9711ec5 RQ |
1743 | if (dev->of_node) { |
1744 | if (omap_get_dt_info(dev, info)) | |
1745 | return -EINVAL; | |
1746 | } else { | |
1747 | pdata = dev_get_platdata(&pdev->dev); | |
1748 | if (!pdata) { | |
1749 | dev_err(&pdev->dev, "platform data missing\n"); | |
1750 | return -EINVAL; | |
1751 | } | |
1752 | ||
1753 | info->gpmc_cs = pdata->cs; | |
1754 | info->reg = pdata->reg; | |
1755 | info->ecc_opt = pdata->ecc_opt; | |
10f22ee3 RQ |
1756 | if (pdata->dev_ready) |
1757 | dev_info(&pdev->dev, "pdata->dev_ready is deprecated\n"); | |
1758 | ||
c9711ec5 RQ |
1759 | info->xfer_type = pdata->xfer_type; |
1760 | info->devsize = pdata->devsize; | |
1761 | info->elm_of_node = pdata->elm_of_node; | |
1762 | info->flash_bbt = pdata->flash_bbt; | |
1763 | } | |
1764 | ||
1765 | platform_set_drvdata(pdev, info); | |
c509aefd RQ |
1766 | info->ops = gpmc_omap_get_nand_ops(&info->reg, info->gpmc_cs); |
1767 | if (!info->ops) { | |
1768 | dev_err(&pdev->dev, "Failed to get GPMC->NAND interface\n"); | |
1769 | return -ENODEV; | |
1770 | } | |
01b95fc6 | 1771 | |
432420c0 BB |
1772 | nand_chip = &info->nand; |
1773 | mtd = nand_to_mtd(nand_chip); | |
853f1c58 | 1774 | mtd->dev.parent = &pdev->dev; |
32d42a85 | 1775 | nand_chip->ecc.priv = NULL; |
c9711ec5 | 1776 | nand_set_flash_node(nand_chip, dev->of_node); |
67ce04bf | 1777 | |
9c4c2f8b | 1778 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
00d09891 JH |
1779 | nand_chip->IO_ADDR_R = devm_ioremap_resource(&pdev->dev, res); |
1780 | if (IS_ERR(nand_chip->IO_ADDR_R)) | |
1781 | return PTR_ERR(nand_chip->IO_ADDR_R); | |
67ce04bf | 1782 | |
9c4c2f8b | 1783 | info->phys_base = res->start; |
59e9c5ae | 1784 | |
1dc338e8 | 1785 | nand_chip->controller = &omap_gpmc_controller; |
67ce04bf | 1786 | |
633deb58 PG |
1787 | nand_chip->IO_ADDR_W = nand_chip->IO_ADDR_R; |
1788 | nand_chip->cmd_ctrl = omap_hwcontrol; | |
67ce04bf | 1789 | |
10f22ee3 RQ |
1790 | info->ready_gpiod = devm_gpiod_get_optional(&pdev->dev, "rb", |
1791 | GPIOD_IN); | |
1792 | if (IS_ERR(info->ready_gpiod)) { | |
1793 | dev_err(dev, "failed to get ready gpio\n"); | |
1794 | return PTR_ERR(info->ready_gpiod); | |
1795 | } | |
1796 | ||
67ce04bf VS |
1797 | /* |
1798 | * If RDY/BSY line is connected to OMAP then use the omap ready | |
4cacbe22 PM |
1799 | * function and the generic nand_wait function which reads the status |
1800 | * register after monitoring the RDY/BSY line. Otherwise use a standard | |
67ce04bf VS |
1801 | * chip delay which is slightly more than tR (AC Timing) of the NAND |
1802 | * device and read status register until you get a failure or success | |
1803 | */ | |
10f22ee3 | 1804 | if (info->ready_gpiod) { |
633deb58 PG |
1805 | nand_chip->dev_ready = omap_dev_ready; |
1806 | nand_chip->chip_delay = 0; | |
67ce04bf | 1807 | } else { |
633deb58 PG |
1808 | nand_chip->waitfunc = omap_wait; |
1809 | nand_chip->chip_delay = 50; | |
67ce04bf VS |
1810 | } |
1811 | ||
c9711ec5 | 1812 | if (info->flash_bbt) |
fef775ca EG |
1813 | nand_chip->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB; |
1814 | else | |
1815 | nand_chip->options |= NAND_SKIP_BBTSCAN; | |
1816 | ||
f18befb5 | 1817 | /* scan NAND device connected to chip controller */ |
01b95fc6 | 1818 | nand_chip->options |= info->devsize & NAND_BUSWIDTH_16; |
f18befb5 | 1819 | if (nand_scan_ident(mtd, 1, NULL)) { |
01b95fc6 RQ |
1820 | dev_err(&info->pdev->dev, |
1821 | "scan failed, may be bus-width mismatch\n"); | |
f18befb5 | 1822 | err = -ENXIO; |
70ba6d71 | 1823 | goto return_error; |
f18befb5 PG |
1824 | } |
1825 | ||
1826 | /* re-populate low-level callbacks based on xfer modes */ | |
01b95fc6 | 1827 | switch (info->xfer_type) { |
1b0b323c | 1828 | case NAND_OMAP_PREFETCH_POLLED: |
633deb58 PG |
1829 | nand_chip->read_buf = omap_read_buf_pref; |
1830 | nand_chip->write_buf = omap_write_buf_pref; | |
1b0b323c SG |
1831 | break; |
1832 | ||
1833 | case NAND_OMAP_POLLED: | |
cf0e4d2b | 1834 | /* Use nand_base defaults for {read,write}_buf */ |
1b0b323c SG |
1835 | break; |
1836 | ||
1837 | case NAND_OMAP_PREFETCH_DMA: | |
763e7359 RK |
1838 | dma_cap_zero(mask); |
1839 | dma_cap_set(DMA_SLAVE, mask); | |
1840 | sig = OMAP24XX_DMA_GPMC; | |
1841 | info->dma = dma_request_channel(mask, omap_dma_filter_fn, &sig); | |
1842 | if (!info->dma) { | |
2df41d05 RK |
1843 | dev_err(&pdev->dev, "DMA engine request failed\n"); |
1844 | err = -ENXIO; | |
70ba6d71 | 1845 | goto return_error; |
763e7359 RK |
1846 | } else { |
1847 | struct dma_slave_config cfg; | |
763e7359 RK |
1848 | |
1849 | memset(&cfg, 0, sizeof(cfg)); | |
1850 | cfg.src_addr = info->phys_base; | |
1851 | cfg.dst_addr = info->phys_base; | |
1852 | cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
1853 | cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
1854 | cfg.src_maxburst = 16; | |
1855 | cfg.dst_maxburst = 16; | |
d680e2c1 AB |
1856 | err = dmaengine_slave_config(info->dma, &cfg); |
1857 | if (err) { | |
763e7359 | 1858 | dev_err(&pdev->dev, "DMA engine slave config failed: %d\n", |
d680e2c1 | 1859 | err); |
70ba6d71 | 1860 | goto return_error; |
763e7359 | 1861 | } |
633deb58 PG |
1862 | nand_chip->read_buf = omap_read_buf_dma_pref; |
1863 | nand_chip->write_buf = omap_write_buf_dma_pref; | |
1b0b323c SG |
1864 | } |
1865 | break; | |
1866 | ||
4e070376 | 1867 | case NAND_OMAP_PREFETCH_IRQ: |
5c468455 AM |
1868 | info->gpmc_irq_fifo = platform_get_irq(pdev, 0); |
1869 | if (info->gpmc_irq_fifo <= 0) { | |
1870 | dev_err(&pdev->dev, "error getting fifo irq\n"); | |
1871 | err = -ENODEV; | |
70ba6d71 | 1872 | goto return_error; |
5c468455 | 1873 | } |
70ba6d71 PG |
1874 | err = devm_request_irq(&pdev->dev, info->gpmc_irq_fifo, |
1875 | omap_nand_irq, IRQF_SHARED, | |
1876 | "gpmc-nand-fifo", info); | |
4e070376 SG |
1877 | if (err) { |
1878 | dev_err(&pdev->dev, "requesting irq(%d) error:%d", | |
5c468455 AM |
1879 | info->gpmc_irq_fifo, err); |
1880 | info->gpmc_irq_fifo = 0; | |
70ba6d71 | 1881 | goto return_error; |
5c468455 AM |
1882 | } |
1883 | ||
1884 | info->gpmc_irq_count = platform_get_irq(pdev, 1); | |
1885 | if (info->gpmc_irq_count <= 0) { | |
1886 | dev_err(&pdev->dev, "error getting count irq\n"); | |
1887 | err = -ENODEV; | |
70ba6d71 | 1888 | goto return_error; |
5c468455 | 1889 | } |
70ba6d71 PG |
1890 | err = devm_request_irq(&pdev->dev, info->gpmc_irq_count, |
1891 | omap_nand_irq, IRQF_SHARED, | |
1892 | "gpmc-nand-count", info); | |
5c468455 AM |
1893 | if (err) { |
1894 | dev_err(&pdev->dev, "requesting irq(%d) error:%d", | |
1895 | info->gpmc_irq_count, err); | |
1896 | info->gpmc_irq_count = 0; | |
70ba6d71 | 1897 | goto return_error; |
4e070376 | 1898 | } |
5c468455 | 1899 | |
633deb58 PG |
1900 | nand_chip->read_buf = omap_read_buf_irq_pref; |
1901 | nand_chip->write_buf = omap_write_buf_irq_pref; | |
5c468455 | 1902 | |
4e070376 SG |
1903 | break; |
1904 | ||
1b0b323c SG |
1905 | default: |
1906 | dev_err(&pdev->dev, | |
01b95fc6 | 1907 | "xfer_type(%d) not supported!\n", info->xfer_type); |
1b0b323c | 1908 | err = -EINVAL; |
70ba6d71 | 1909 | goto return_error; |
59e9c5ae | 1910 | } |
59e9c5ae | 1911 | |
93af53b8 EG |
1912 | if (!omap2_nand_ecc_check(info, pdata)) { |
1913 | err = -EINVAL; | |
1914 | goto return_error; | |
1915 | } | |
1916 | ||
a8c65d50 BB |
1917 | /* |
1918 | * Bail out earlier to let NAND_ECC_SOFT code create its own | |
1919 | * ecclayout instead of using ours. | |
1920 | */ | |
1921 | if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) { | |
1922 | nand_chip->ecc.mode = NAND_ECC_SOFT; | |
1923 | goto scan_tail; | |
1924 | } | |
1925 | ||
a919e511 | 1926 | /* populate MTD interface based on ECC scheme */ |
94cb4ee0 | 1927 | ecclayout = &info->oobinfo; |
a8c65d50 | 1928 | nand_chip->ecc.layout = ecclayout; |
4e558072 | 1929 | switch (info->ecc_opt) { |
a919e511 PG |
1930 | case OMAP_ECC_HAM1_CODE_HW: |
1931 | pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n"); | |
1932 | nand_chip->ecc.mode = NAND_ECC_HW; | |
633deb58 PG |
1933 | nand_chip->ecc.bytes = 3; |
1934 | nand_chip->ecc.size = 512; | |
1935 | nand_chip->ecc.strength = 1; | |
1936 | nand_chip->ecc.calculate = omap_calculate_ecc; | |
1937 | nand_chip->ecc.hwctl = omap_enable_hwecc; | |
1938 | nand_chip->ecc.correct = omap_correct_data; | |
b491da72 PG |
1939 | /* define ECC layout */ |
1940 | ecclayout->eccbytes = nand_chip->ecc.bytes * | |
1941 | (mtd->writesize / | |
1942 | nand_chip->ecc.size); | |
1943 | if (nand_chip->options & NAND_BUSWIDTH_16) | |
eae39cb4 | 1944 | oob_index = BADBLOCK_MARKER_LENGTH; |
b491da72 | 1945 | else |
eae39cb4 PG |
1946 | oob_index = 1; |
1947 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) | |
1948 | ecclayout->eccpos[i] = oob_index; | |
aa6092f9 PG |
1949 | /* no reserved-marker in ecclayout for this ecc-scheme */ |
1950 | ecclayout->oobfree->offset = | |
1951 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; | |
a919e511 PG |
1952 | break; |
1953 | ||
1954 | case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW: | |
a919e511 PG |
1955 | pr_info("nand: using OMAP_ECC_BCH4_CODE_HW_DETECTION_SW\n"); |
1956 | nand_chip->ecc.mode = NAND_ECC_HW; | |
1957 | nand_chip->ecc.size = 512; | |
1958 | nand_chip->ecc.bytes = 7; | |
1959 | nand_chip->ecc.strength = 4; | |
7c977c3e | 1960 | nand_chip->ecc.hwctl = omap_enable_hwecc_bch; |
32d42a85 | 1961 | nand_chip->ecc.correct = nand_bch_correct_data; |
2c9f2365 | 1962 | nand_chip->ecc.calculate = omap_calculate_ecc_bch; |
b491da72 PG |
1963 | /* define ECC layout */ |
1964 | ecclayout->eccbytes = nand_chip->ecc.bytes * | |
1965 | (mtd->writesize / | |
1966 | nand_chip->ecc.size); | |
eae39cb4 PG |
1967 | oob_index = BADBLOCK_MARKER_LENGTH; |
1968 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) { | |
1969 | ecclayout->eccpos[i] = oob_index; | |
1970 | if (((i + 1) % nand_chip->ecc.bytes) == 0) | |
1971 | oob_index++; | |
1972 | } | |
aa6092f9 PG |
1973 | /* include reserved-marker in ecclayout->oobfree calculation */ |
1974 | ecclayout->oobfree->offset = 1 + | |
1975 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; | |
a919e511 | 1976 | /* software bch library is used for locating errors */ |
a8c65d50 | 1977 | nand_chip->ecc.priv = nand_bch_init(mtd); |
32d42a85 | 1978 | if (!nand_chip->ecc.priv) { |
d2f08c75 | 1979 | dev_err(&info->pdev->dev, "unable to use BCH library\n"); |
0e618ef0 | 1980 | err = -EINVAL; |
d2f08c75 | 1981 | goto return_error; |
a919e511 PG |
1982 | } |
1983 | break; | |
a919e511 PG |
1984 | |
1985 | case OMAP_ECC_BCH4_CODE_HW: | |
a919e511 PG |
1986 | pr_info("nand: using OMAP_ECC_BCH4_CODE_HW ECC scheme\n"); |
1987 | nand_chip->ecc.mode = NAND_ECC_HW; | |
1988 | nand_chip->ecc.size = 512; | |
1989 | /* 14th bit is kept reserved for ROM-code compatibility */ | |
1990 | nand_chip->ecc.bytes = 7 + 1; | |
1991 | nand_chip->ecc.strength = 4; | |
7c977c3e | 1992 | nand_chip->ecc.hwctl = omap_enable_hwecc_bch; |
a919e511 | 1993 | nand_chip->ecc.correct = omap_elm_correct_data; |
a4c7ca00 | 1994 | nand_chip->ecc.calculate = omap_calculate_ecc_bch; |
a919e511 PG |
1995 | nand_chip->ecc.read_page = omap_read_page_bch; |
1996 | nand_chip->ecc.write_page = omap_write_page_bch; | |
b491da72 PG |
1997 | /* define ECC layout */ |
1998 | ecclayout->eccbytes = nand_chip->ecc.bytes * | |
1999 | (mtd->writesize / | |
2000 | nand_chip->ecc.size); | |
eae39cb4 PG |
2001 | oob_index = BADBLOCK_MARKER_LENGTH; |
2002 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) | |
2003 | ecclayout->eccpos[i] = oob_index; | |
aa6092f9 PG |
2004 | /* reserved marker already included in ecclayout->eccbytes */ |
2005 | ecclayout->oobfree->offset = | |
2006 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; | |
93af53b8 EG |
2007 | |
2008 | err = elm_config(info->elm_dev, BCH4_ECC, | |
432420c0 | 2009 | mtd->writesize / nand_chip->ecc.size, |
93af53b8 EG |
2010 | nand_chip->ecc.size, nand_chip->ecc.bytes); |
2011 | if (err < 0) | |
70ba6d71 | 2012 | goto return_error; |
a919e511 | 2013 | break; |
a919e511 PG |
2014 | |
2015 | case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW: | |
a919e511 PG |
2016 | pr_info("nand: using OMAP_ECC_BCH8_CODE_HW_DETECTION_SW\n"); |
2017 | nand_chip->ecc.mode = NAND_ECC_HW; | |
2018 | nand_chip->ecc.size = 512; | |
2019 | nand_chip->ecc.bytes = 13; | |
2020 | nand_chip->ecc.strength = 8; | |
7c977c3e | 2021 | nand_chip->ecc.hwctl = omap_enable_hwecc_bch; |
32d42a85 | 2022 | nand_chip->ecc.correct = nand_bch_correct_data; |
7bcd1dca | 2023 | nand_chip->ecc.calculate = omap_calculate_ecc_bch; |
b491da72 PG |
2024 | /* define ECC layout */ |
2025 | ecclayout->eccbytes = nand_chip->ecc.bytes * | |
2026 | (mtd->writesize / | |
2027 | nand_chip->ecc.size); | |
eae39cb4 PG |
2028 | oob_index = BADBLOCK_MARKER_LENGTH; |
2029 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) { | |
2030 | ecclayout->eccpos[i] = oob_index; | |
2031 | if (((i + 1) % nand_chip->ecc.bytes) == 0) | |
2032 | oob_index++; | |
2033 | } | |
aa6092f9 PG |
2034 | /* include reserved-marker in ecclayout->oobfree calculation */ |
2035 | ecclayout->oobfree->offset = 1 + | |
2036 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; | |
a919e511 | 2037 | /* software bch library is used for locating errors */ |
a8c65d50 | 2038 | nand_chip->ecc.priv = nand_bch_init(mtd); |
32d42a85 | 2039 | if (!nand_chip->ecc.priv) { |
d2f08c75 | 2040 | dev_err(&info->pdev->dev, "unable to use BCH library\n"); |
a919e511 | 2041 | err = -EINVAL; |
70ba6d71 | 2042 | goto return_error; |
a919e511 PG |
2043 | } |
2044 | break; | |
a919e511 PG |
2045 | |
2046 | case OMAP_ECC_BCH8_CODE_HW: | |
a919e511 PG |
2047 | pr_info("nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme\n"); |
2048 | nand_chip->ecc.mode = NAND_ECC_HW; | |
2049 | nand_chip->ecc.size = 512; | |
2050 | /* 14th bit is kept reserved for ROM-code compatibility */ | |
2051 | nand_chip->ecc.bytes = 13 + 1; | |
2052 | nand_chip->ecc.strength = 8; | |
7c977c3e | 2053 | nand_chip->ecc.hwctl = omap_enable_hwecc_bch; |
a919e511 | 2054 | nand_chip->ecc.correct = omap_elm_correct_data; |
a4c7ca00 | 2055 | nand_chip->ecc.calculate = omap_calculate_ecc_bch; |
a919e511 PG |
2056 | nand_chip->ecc.read_page = omap_read_page_bch; |
2057 | nand_chip->ecc.write_page = omap_write_page_bch; | |
93af53b8 EG |
2058 | |
2059 | err = elm_config(info->elm_dev, BCH8_ECC, | |
432420c0 | 2060 | mtd->writesize / nand_chip->ecc.size, |
93af53b8 EG |
2061 | nand_chip->ecc.size, nand_chip->ecc.bytes); |
2062 | if (err < 0) | |
70ba6d71 | 2063 | goto return_error; |
93af53b8 | 2064 | |
b491da72 PG |
2065 | /* define ECC layout */ |
2066 | ecclayout->eccbytes = nand_chip->ecc.bytes * | |
2067 | (mtd->writesize / | |
2068 | nand_chip->ecc.size); | |
eae39cb4 PG |
2069 | oob_index = BADBLOCK_MARKER_LENGTH; |
2070 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) | |
2071 | ecclayout->eccpos[i] = oob_index; | |
aa6092f9 PG |
2072 | /* reserved marker already included in ecclayout->eccbytes */ |
2073 | ecclayout->oobfree->offset = | |
2074 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; | |
a919e511 | 2075 | break; |
a919e511 | 2076 | |
9748fff9 | 2077 | case OMAP_ECC_BCH16_CODE_HW: |
9748fff9 | 2078 | pr_info("using OMAP_ECC_BCH16_CODE_HW ECC scheme\n"); |
2079 | nand_chip->ecc.mode = NAND_ECC_HW; | |
2080 | nand_chip->ecc.size = 512; | |
2081 | nand_chip->ecc.bytes = 26; | |
2082 | nand_chip->ecc.strength = 16; | |
2083 | nand_chip->ecc.hwctl = omap_enable_hwecc_bch; | |
2084 | nand_chip->ecc.correct = omap_elm_correct_data; | |
2085 | nand_chip->ecc.calculate = omap_calculate_ecc_bch; | |
2086 | nand_chip->ecc.read_page = omap_read_page_bch; | |
2087 | nand_chip->ecc.write_page = omap_write_page_bch; | |
93af53b8 EG |
2088 | |
2089 | err = elm_config(info->elm_dev, BCH16_ECC, | |
432420c0 | 2090 | mtd->writesize / nand_chip->ecc.size, |
93af53b8 EG |
2091 | nand_chip->ecc.size, nand_chip->ecc.bytes); |
2092 | if (err < 0) | |
9748fff9 | 2093 | goto return_error; |
93af53b8 | 2094 | |
9748fff9 | 2095 | /* define ECC layout */ |
2096 | ecclayout->eccbytes = nand_chip->ecc.bytes * | |
2097 | (mtd->writesize / | |
2098 | nand_chip->ecc.size); | |
2099 | oob_index = BADBLOCK_MARKER_LENGTH; | |
2100 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) | |
2101 | ecclayout->eccpos[i] = oob_index; | |
2102 | /* reserved marker already included in ecclayout->eccbytes */ | |
2103 | ecclayout->oobfree->offset = | |
2104 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; | |
2105 | break; | |
a919e511 | 2106 | default: |
d2f08c75 | 2107 | dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n"); |
a919e511 | 2108 | err = -EINVAL; |
70ba6d71 | 2109 | goto return_error; |
f3d73f36 | 2110 | } |
67ce04bf | 2111 | |
bb38eefb PG |
2112 | /* all OOB bytes from oobfree->offset till end off OOB are free */ |
2113 | ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset; | |
b491da72 PG |
2114 | /* check if NAND device's OOB is enough to store ECC signatures */ |
2115 | if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) { | |
d2f08c75 EG |
2116 | dev_err(&info->pdev->dev, |
2117 | "not enough OOB bytes required = %d, available=%d\n", | |
2118 | ecclayout->eccbytes, mtd->oobsize); | |
b491da72 | 2119 | err = -EINVAL; |
70ba6d71 | 2120 | goto return_error; |
f040d332 | 2121 | } |
1b0b323c | 2122 | |
7d5929c1 | 2123 | scan_tail: |
a80f1c1f | 2124 | /* second phase scan */ |
633deb58 | 2125 | if (nand_scan_tail(mtd)) { |
a80f1c1f | 2126 | err = -ENXIO; |
70ba6d71 | 2127 | goto return_error; |
a80f1c1f JW |
2128 | } |
2129 | ||
c9711ec5 RQ |
2130 | if (dev->of_node) |
2131 | mtd_device_register(mtd, NULL, 0); | |
2132 | else | |
2133 | mtd_device_register(mtd, pdata->parts, pdata->nr_parts); | |
67ce04bf | 2134 | |
633deb58 | 2135 | platform_set_drvdata(pdev, mtd); |
67ce04bf VS |
2136 | |
2137 | return 0; | |
2138 | ||
70ba6d71 | 2139 | return_error: |
763e7359 RK |
2140 | if (info->dma) |
2141 | dma_release_channel(info->dma); | |
32d42a85 PG |
2142 | if (nand_chip->ecc.priv) { |
2143 | nand_bch_free(nand_chip->ecc.priv); | |
2144 | nand_chip->ecc.priv = NULL; | |
2145 | } | |
67ce04bf VS |
2146 | return err; |
2147 | } | |
2148 | ||
2149 | static int omap_nand_remove(struct platform_device *pdev) | |
2150 | { | |
2151 | struct mtd_info *mtd = platform_get_drvdata(pdev); | |
4bd4ebcc | 2152 | struct nand_chip *nand_chip = mtd_to_nand(mtd); |
4578ea9a | 2153 | struct omap_nand_info *info = mtd_to_omap(mtd); |
32d42a85 PG |
2154 | if (nand_chip->ecc.priv) { |
2155 | nand_bch_free(nand_chip->ecc.priv); | |
2156 | nand_chip->ecc.priv = NULL; | |
2157 | } | |
763e7359 RK |
2158 | if (info->dma) |
2159 | dma_release_channel(info->dma); | |
633deb58 | 2160 | nand_release(mtd); |
67ce04bf VS |
2161 | return 0; |
2162 | } | |
2163 | ||
c9711ec5 RQ |
2164 | static const struct of_device_id omap_nand_ids[] = { |
2165 | { .compatible = "ti,omap2-nand", }, | |
2166 | {}, | |
2167 | }; | |
2168 | ||
67ce04bf VS |
2169 | static struct platform_driver omap_nand_driver = { |
2170 | .probe = omap_nand_probe, | |
2171 | .remove = omap_nand_remove, | |
2172 | .driver = { | |
2173 | .name = DRIVER_NAME, | |
c9711ec5 | 2174 | .of_match_table = of_match_ptr(omap_nand_ids), |
67ce04bf VS |
2175 | }, |
2176 | }; | |
2177 | ||
f99640de | 2178 | module_platform_driver(omap_nand_driver); |
67ce04bf | 2179 | |
c804c733 | 2180 | MODULE_ALIAS("platform:" DRIVER_NAME); |
67ce04bf VS |
2181 | MODULE_LICENSE("GPL"); |
2182 | MODULE_DESCRIPTION("Glue layer for NAND flash on TI OMAP boards"); |