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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[deliverable/linux.git] / drivers / mtd / nand / pxa3xx_nand.c
1 /*
2 * drivers/mtd/nand/pxa3xx_nand.c
3 *
4 * Copyright © 2005 Intel Corporation
5 * Copyright © 2006 Marvell International Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/module.h>
13 #include <linux/interrupt.h>
14 #include <linux/platform_device.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/delay.h>
17 #include <linux/clk.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/nand.h>
20 #include <linux/mtd/partitions.h>
21 #include <linux/io.h>
22 #include <linux/irq.h>
23
24 #include <mach/dma.h>
25 #include <mach/pxa3xx_nand.h>
26
27 #define CHIP_DELAY_TIMEOUT (2 * HZ/10)
28
29 /* registers and bit definitions */
30 #define NDCR (0x00) /* Control register */
31 #define NDTR0CS0 (0x04) /* Timing Parameter 0 for CS0 */
32 #define NDTR1CS0 (0x0C) /* Timing Parameter 1 for CS0 */
33 #define NDSR (0x14) /* Status Register */
34 #define NDPCR (0x18) /* Page Count Register */
35 #define NDBDR0 (0x1C) /* Bad Block Register 0 */
36 #define NDBDR1 (0x20) /* Bad Block Register 1 */
37 #define NDDB (0x40) /* Data Buffer */
38 #define NDCB0 (0x48) /* Command Buffer0 */
39 #define NDCB1 (0x4C) /* Command Buffer1 */
40 #define NDCB2 (0x50) /* Command Buffer2 */
41
42 #define NDCR_SPARE_EN (0x1 << 31)
43 #define NDCR_ECC_EN (0x1 << 30)
44 #define NDCR_DMA_EN (0x1 << 29)
45 #define NDCR_ND_RUN (0x1 << 28)
46 #define NDCR_DWIDTH_C (0x1 << 27)
47 #define NDCR_DWIDTH_M (0x1 << 26)
48 #define NDCR_PAGE_SZ (0x1 << 24)
49 #define NDCR_NCSX (0x1 << 23)
50 #define NDCR_ND_MODE (0x3 << 21)
51 #define NDCR_NAND_MODE (0x0)
52 #define NDCR_CLR_PG_CNT (0x1 << 20)
53 #define NDCR_CLR_ECC (0x1 << 19)
54 #define NDCR_RD_ID_CNT_MASK (0x7 << 16)
55 #define NDCR_RD_ID_CNT(x) (((x) << 16) & NDCR_RD_ID_CNT_MASK)
56
57 #define NDCR_RA_START (0x1 << 15)
58 #define NDCR_PG_PER_BLK (0x1 << 14)
59 #define NDCR_ND_ARB_EN (0x1 << 12)
60
61 #define NDSR_MASK (0xfff)
62 #define NDSR_RDY (0x1 << 11)
63 #define NDSR_CS0_PAGED (0x1 << 10)
64 #define NDSR_CS1_PAGED (0x1 << 9)
65 #define NDSR_CS0_CMDD (0x1 << 8)
66 #define NDSR_CS1_CMDD (0x1 << 7)
67 #define NDSR_CS0_BBD (0x1 << 6)
68 #define NDSR_CS1_BBD (0x1 << 5)
69 #define NDSR_DBERR (0x1 << 4)
70 #define NDSR_SBERR (0x1 << 3)
71 #define NDSR_WRDREQ (0x1 << 2)
72 #define NDSR_RDDREQ (0x1 << 1)
73 #define NDSR_WRCMDREQ (0x1)
74
75 #define NDCB0_AUTO_RS (0x1 << 25)
76 #define NDCB0_CSEL (0x1 << 24)
77 #define NDCB0_CMD_TYPE_MASK (0x7 << 21)
78 #define NDCB0_CMD_TYPE(x) (((x) << 21) & NDCB0_CMD_TYPE_MASK)
79 #define NDCB0_NC (0x1 << 20)
80 #define NDCB0_DBC (0x1 << 19)
81 #define NDCB0_ADDR_CYC_MASK (0x7 << 16)
82 #define NDCB0_ADDR_CYC(x) (((x) << 16) & NDCB0_ADDR_CYC_MASK)
83 #define NDCB0_CMD2_MASK (0xff << 8)
84 #define NDCB0_CMD1_MASK (0xff)
85 #define NDCB0_ADDR_CYC_SHIFT (16)
86
87 /* dma-able I/O address for the NAND data and commands */
88 #define NDCB0_DMA_ADDR (0x43100048)
89 #define NDDB_DMA_ADDR (0x43100040)
90
91 /* macros for registers read/write */
92 #define nand_writel(info, off, val) \
93 __raw_writel((val), (info)->mmio_base + (off))
94
95 #define nand_readl(info, off) \
96 __raw_readl((info)->mmio_base + (off))
97
98 /* error code and state */
99 enum {
100 ERR_NONE = 0,
101 ERR_DMABUSERR = -1,
102 ERR_SENDCMD = -2,
103 ERR_DBERR = -3,
104 ERR_BBERR = -4,
105 ERR_SBERR = -5,
106 };
107
108 enum {
109 STATE_READY = 0,
110 STATE_CMD_HANDLE,
111 STATE_DMA_READING,
112 STATE_DMA_WRITING,
113 STATE_DMA_DONE,
114 STATE_PIO_READING,
115 STATE_PIO_WRITING,
116 };
117
118 struct pxa3xx_nand_info {
119 struct nand_chip nand_chip;
120
121 struct platform_device *pdev;
122 const struct pxa3xx_nand_flash *flash_info;
123
124 struct clk *clk;
125 void __iomem *mmio_base;
126
127 unsigned int buf_start;
128 unsigned int buf_count;
129
130 /* DMA information */
131 int drcmr_dat;
132 int drcmr_cmd;
133
134 unsigned char *data_buff;
135 dma_addr_t data_buff_phys;
136 size_t data_buff_size;
137 int data_dma_ch;
138 struct pxa_dma_desc *data_desc;
139 dma_addr_t data_desc_addr;
140
141 uint32_t reg_ndcr;
142
143 /* saved column/page_addr during CMD_SEQIN */
144 int seqin_column;
145 int seqin_page_addr;
146
147 /* relate to the command */
148 unsigned int state;
149
150 int use_ecc; /* use HW ECC ? */
151 int use_dma; /* use DMA ? */
152
153 size_t data_size; /* data size in FIFO */
154 int retcode;
155 struct completion cmd_complete;
156
157 /* generated NDCBx register values */
158 uint32_t ndcb0;
159 uint32_t ndcb1;
160 uint32_t ndcb2;
161
162 /* calculated from pxa3xx_nand_flash data */
163 size_t oob_size;
164 size_t read_id_bytes;
165
166 unsigned int col_addr_cycles;
167 unsigned int row_addr_cycles;
168 };
169
170 static int use_dma = 1;
171 module_param(use_dma, bool, 0444);
172 MODULE_PARM_DESC(use_dma, "enable DMA for data transfering to/from NAND HW");
173
174 /*
175 * Default NAND flash controller configuration setup by the
176 * bootloader. This configuration is used only when pdata->keep_config is set
177 */
178 static struct pxa3xx_nand_timing default_timing;
179 static struct pxa3xx_nand_flash default_flash;
180
181 static struct pxa3xx_nand_cmdset smallpage_cmdset = {
182 .read1 = 0x0000,
183 .read2 = 0x0050,
184 .program = 0x1080,
185 .read_status = 0x0070,
186 .read_id = 0x0090,
187 .erase = 0xD060,
188 .reset = 0x00FF,
189 .lock = 0x002A,
190 .unlock = 0x2423,
191 .lock_status = 0x007A,
192 };
193
194 static struct pxa3xx_nand_cmdset largepage_cmdset = {
195 .read1 = 0x3000,
196 .read2 = 0x0050,
197 .program = 0x1080,
198 .read_status = 0x0070,
199 .read_id = 0x0090,
200 .erase = 0xD060,
201 .reset = 0x00FF,
202 .lock = 0x002A,
203 .unlock = 0x2423,
204 .lock_status = 0x007A,
205 };
206
207 #ifdef CONFIG_MTD_NAND_PXA3xx_BUILTIN
208 static struct pxa3xx_nand_timing samsung512MbX16_timing = {
209 .tCH = 10,
210 .tCS = 0,
211 .tWH = 20,
212 .tWP = 40,
213 .tRH = 30,
214 .tRP = 40,
215 .tR = 11123,
216 .tWHR = 110,
217 .tAR = 10,
218 };
219
220 static struct pxa3xx_nand_flash samsung512MbX16 = {
221 .timing = &samsung512MbX16_timing,
222 .cmdset = &smallpage_cmdset,
223 .page_per_block = 32,
224 .page_size = 512,
225 .flash_width = 16,
226 .dfc_width = 16,
227 .num_blocks = 4096,
228 .chip_id = 0x46ec,
229 };
230
231 static struct pxa3xx_nand_timing micron_timing = {
232 .tCH = 10,
233 .tCS = 25,
234 .tWH = 15,
235 .tWP = 25,
236 .tRH = 15,
237 .tRP = 25,
238 .tR = 25000,
239 .tWHR = 60,
240 .tAR = 10,
241 };
242
243 static struct pxa3xx_nand_flash micron1GbX8 = {
244 .timing = &micron_timing,
245 .cmdset = &largepage_cmdset,
246 .page_per_block = 64,
247 .page_size = 2048,
248 .flash_width = 8,
249 .dfc_width = 8,
250 .num_blocks = 1024,
251 .chip_id = 0xa12c,
252 };
253
254 static struct pxa3xx_nand_flash micron1GbX16 = {
255 .timing = &micron_timing,
256 .cmdset = &largepage_cmdset,
257 .page_per_block = 64,
258 .page_size = 2048,
259 .flash_width = 16,
260 .dfc_width = 16,
261 .num_blocks = 1024,
262 .chip_id = 0xb12c,
263 };
264
265 static struct pxa3xx_nand_timing stm2GbX16_timing = {
266 .tCH = 10,
267 .tCS = 35,
268 .tWH = 15,
269 .tWP = 25,
270 .tRH = 15,
271 .tRP = 25,
272 .tR = 25000,
273 .tWHR = 60,
274 .tAR = 10,
275 };
276
277 static struct pxa3xx_nand_flash stm2GbX16 = {
278 .timing = &stm2GbX16_timing,
279 .cmdset = &largepage_cmdset,
280 .page_per_block = 64,
281 .page_size = 2048,
282 .flash_width = 16,
283 .dfc_width = 16,
284 .num_blocks = 2048,
285 .chip_id = 0xba20,
286 };
287
288 static struct pxa3xx_nand_flash *builtin_flash_types[] = {
289 &samsung512MbX16,
290 &micron1GbX8,
291 &micron1GbX16,
292 &stm2GbX16,
293 };
294 #endif /* CONFIG_MTD_NAND_PXA3xx_BUILTIN */
295
296 #define NDTR0_tCH(c) (min((c), 7) << 19)
297 #define NDTR0_tCS(c) (min((c), 7) << 16)
298 #define NDTR0_tWH(c) (min((c), 7) << 11)
299 #define NDTR0_tWP(c) (min((c), 7) << 8)
300 #define NDTR0_tRH(c) (min((c), 7) << 3)
301 #define NDTR0_tRP(c) (min((c), 7) << 0)
302
303 #define NDTR1_tR(c) (min((c), 65535) << 16)
304 #define NDTR1_tWHR(c) (min((c), 15) << 4)
305 #define NDTR1_tAR(c) (min((c), 15) << 0)
306
307 #define tCH_NDTR0(r) (((r) >> 19) & 0x7)
308 #define tCS_NDTR0(r) (((r) >> 16) & 0x7)
309 #define tWH_NDTR0(r) (((r) >> 11) & 0x7)
310 #define tWP_NDTR0(r) (((r) >> 8) & 0x7)
311 #define tRH_NDTR0(r) (((r) >> 3) & 0x7)
312 #define tRP_NDTR0(r) (((r) >> 0) & 0x7)
313
314 #define tR_NDTR1(r) (((r) >> 16) & 0xffff)
315 #define tWHR_NDTR1(r) (((r) >> 4) & 0xf)
316 #define tAR_NDTR1(r) (((r) >> 0) & 0xf)
317
318 /* convert nano-seconds to nand flash controller clock cycles */
319 #define ns2cycle(ns, clk) (int)(((ns) * (clk / 1000000) / 1000) - 1)
320
321 /* convert nand flash controller clock cycles to nano-seconds */
322 #define cycle2ns(c, clk) ((((c) + 1) * 1000000 + clk / 500) / (clk / 1000))
323
324 static void pxa3xx_nand_set_timing(struct pxa3xx_nand_info *info,
325 const struct pxa3xx_nand_timing *t)
326 {
327 unsigned long nand_clk = clk_get_rate(info->clk);
328 uint32_t ndtr0, ndtr1;
329
330 ndtr0 = NDTR0_tCH(ns2cycle(t->tCH, nand_clk)) |
331 NDTR0_tCS(ns2cycle(t->tCS, nand_clk)) |
332 NDTR0_tWH(ns2cycle(t->tWH, nand_clk)) |
333 NDTR0_tWP(ns2cycle(t->tWP, nand_clk)) |
334 NDTR0_tRH(ns2cycle(t->tRH, nand_clk)) |
335 NDTR0_tRP(ns2cycle(t->tRP, nand_clk));
336
337 ndtr1 = NDTR1_tR(ns2cycle(t->tR, nand_clk)) |
338 NDTR1_tWHR(ns2cycle(t->tWHR, nand_clk)) |
339 NDTR1_tAR(ns2cycle(t->tAR, nand_clk));
340
341 nand_writel(info, NDTR0CS0, ndtr0);
342 nand_writel(info, NDTR1CS0, ndtr1);
343 }
344
345 #define WAIT_EVENT_TIMEOUT 10
346
347 static int wait_for_event(struct pxa3xx_nand_info *info, uint32_t event)
348 {
349 int timeout = WAIT_EVENT_TIMEOUT;
350 uint32_t ndsr;
351
352 while (timeout--) {
353 ndsr = nand_readl(info, NDSR) & NDSR_MASK;
354 if (ndsr & event) {
355 nand_writel(info, NDSR, ndsr);
356 return 0;
357 }
358 udelay(10);
359 }
360
361 return -ETIMEDOUT;
362 }
363
364 static int prepare_read_prog_cmd(struct pxa3xx_nand_info *info,
365 uint16_t cmd, int column, int page_addr)
366 {
367 const struct pxa3xx_nand_flash *f = info->flash_info;
368 const struct pxa3xx_nand_cmdset *cmdset = f->cmdset;
369
370 /* calculate data size */
371 switch (f->page_size) {
372 case 2048:
373 info->data_size = (info->use_ecc) ? 2088 : 2112;
374 break;
375 case 512:
376 info->data_size = (info->use_ecc) ? 520 : 528;
377 break;
378 default:
379 return -EINVAL;
380 }
381
382 /* generate values for NDCBx registers */
383 info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
384 info->ndcb1 = 0;
385 info->ndcb2 = 0;
386 info->ndcb0 |= NDCB0_ADDR_CYC(info->row_addr_cycles + info->col_addr_cycles);
387
388 if (info->col_addr_cycles == 2) {
389 /* large block, 2 cycles for column address
390 * row address starts from 3rd cycle
391 */
392 info->ndcb1 |= page_addr << 16;
393 if (info->row_addr_cycles == 3)
394 info->ndcb2 = (page_addr >> 16) & 0xff;
395 } else
396 /* small block, 1 cycles for column address
397 * row address starts from 2nd cycle
398 */
399 info->ndcb1 = page_addr << 8;
400
401 if (cmd == cmdset->program)
402 info->ndcb0 |= NDCB0_CMD_TYPE(1) | NDCB0_AUTO_RS;
403
404 return 0;
405 }
406
407 static int prepare_erase_cmd(struct pxa3xx_nand_info *info,
408 uint16_t cmd, int page_addr)
409 {
410 info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
411 info->ndcb0 |= NDCB0_CMD_TYPE(2) | NDCB0_AUTO_RS | NDCB0_ADDR_CYC(3);
412 info->ndcb1 = page_addr;
413 info->ndcb2 = 0;
414 return 0;
415 }
416
417 static int prepare_other_cmd(struct pxa3xx_nand_info *info, uint16_t cmd)
418 {
419 const struct pxa3xx_nand_cmdset *cmdset = info->flash_info->cmdset;
420
421 info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
422 info->ndcb1 = 0;
423 info->ndcb2 = 0;
424
425 if (cmd == cmdset->read_id) {
426 info->ndcb0 |= NDCB0_CMD_TYPE(3);
427 info->data_size = 8;
428 } else if (cmd == cmdset->read_status) {
429 info->ndcb0 |= NDCB0_CMD_TYPE(4);
430 info->data_size = 8;
431 } else if (cmd == cmdset->reset || cmd == cmdset->lock ||
432 cmd == cmdset->unlock) {
433 info->ndcb0 |= NDCB0_CMD_TYPE(5);
434 } else
435 return -EINVAL;
436
437 return 0;
438 }
439
440 static void enable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
441 {
442 uint32_t ndcr;
443
444 ndcr = nand_readl(info, NDCR);
445 nand_writel(info, NDCR, ndcr & ~int_mask);
446 }
447
448 static void disable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
449 {
450 uint32_t ndcr;
451
452 ndcr = nand_readl(info, NDCR);
453 nand_writel(info, NDCR, ndcr | int_mask);
454 }
455
456 /* NOTE: it is a must to set ND_RUN firstly, then write command buffer
457 * otherwise, it does not work
458 */
459 static int write_cmd(struct pxa3xx_nand_info *info)
460 {
461 uint32_t ndcr;
462
463 /* clear status bits and run */
464 nand_writel(info, NDSR, NDSR_MASK);
465
466 ndcr = info->reg_ndcr;
467
468 ndcr |= info->use_ecc ? NDCR_ECC_EN : 0;
469 ndcr |= info->use_dma ? NDCR_DMA_EN : 0;
470 ndcr |= NDCR_ND_RUN;
471
472 nand_writel(info, NDCR, ndcr);
473
474 if (wait_for_event(info, NDSR_WRCMDREQ)) {
475 printk(KERN_ERR "timed out writing command\n");
476 return -ETIMEDOUT;
477 }
478
479 nand_writel(info, NDCB0, info->ndcb0);
480 nand_writel(info, NDCB0, info->ndcb1);
481 nand_writel(info, NDCB0, info->ndcb2);
482 return 0;
483 }
484
485 static int handle_data_pio(struct pxa3xx_nand_info *info)
486 {
487 int ret, timeout = CHIP_DELAY_TIMEOUT;
488
489 switch (info->state) {
490 case STATE_PIO_WRITING:
491 __raw_writesl(info->mmio_base + NDDB, info->data_buff,
492 info->data_size << 2);
493
494 enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
495
496 ret = wait_for_completion_timeout(&info->cmd_complete, timeout);
497 if (!ret) {
498 printk(KERN_ERR "program command time out\n");
499 return -1;
500 }
501 break;
502 case STATE_PIO_READING:
503 __raw_readsl(info->mmio_base + NDDB, info->data_buff,
504 info->data_size << 2);
505 break;
506 default:
507 printk(KERN_ERR "%s: invalid state %d\n", __func__,
508 info->state);
509 return -EINVAL;
510 }
511
512 info->state = STATE_READY;
513 return 0;
514 }
515
516 static void start_data_dma(struct pxa3xx_nand_info *info, int dir_out)
517 {
518 struct pxa_dma_desc *desc = info->data_desc;
519 int dma_len = ALIGN(info->data_size, 32);
520
521 desc->ddadr = DDADR_STOP;
522 desc->dcmd = DCMD_ENDIRQEN | DCMD_WIDTH4 | DCMD_BURST32 | dma_len;
523
524 if (dir_out) {
525 desc->dsadr = info->data_buff_phys;
526 desc->dtadr = NDDB_DMA_ADDR;
527 desc->dcmd |= DCMD_INCSRCADDR | DCMD_FLOWTRG;
528 } else {
529 desc->dtadr = info->data_buff_phys;
530 desc->dsadr = NDDB_DMA_ADDR;
531 desc->dcmd |= DCMD_INCTRGADDR | DCMD_FLOWSRC;
532 }
533
534 DRCMR(info->drcmr_dat) = DRCMR_MAPVLD | info->data_dma_ch;
535 DDADR(info->data_dma_ch) = info->data_desc_addr;
536 DCSR(info->data_dma_ch) |= DCSR_RUN;
537 }
538
539 static void pxa3xx_nand_data_dma_irq(int channel, void *data)
540 {
541 struct pxa3xx_nand_info *info = data;
542 uint32_t dcsr;
543
544 dcsr = DCSR(channel);
545 DCSR(channel) = dcsr;
546
547 if (dcsr & DCSR_BUSERR) {
548 info->retcode = ERR_DMABUSERR;
549 complete(&info->cmd_complete);
550 }
551
552 if (info->state == STATE_DMA_WRITING) {
553 info->state = STATE_DMA_DONE;
554 enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
555 } else {
556 info->state = STATE_READY;
557 complete(&info->cmd_complete);
558 }
559 }
560
561 static irqreturn_t pxa3xx_nand_irq(int irq, void *devid)
562 {
563 struct pxa3xx_nand_info *info = devid;
564 unsigned int status;
565
566 status = nand_readl(info, NDSR);
567
568 if (status & (NDSR_RDDREQ | NDSR_DBERR | NDSR_SBERR)) {
569 if (status & NDSR_DBERR)
570 info->retcode = ERR_DBERR;
571 else if (status & NDSR_SBERR)
572 info->retcode = ERR_SBERR;
573
574 disable_int(info, NDSR_RDDREQ | NDSR_DBERR | NDSR_SBERR);
575
576 if (info->use_dma) {
577 info->state = STATE_DMA_READING;
578 start_data_dma(info, 0);
579 } else {
580 info->state = STATE_PIO_READING;
581 complete(&info->cmd_complete);
582 }
583 } else if (status & NDSR_WRDREQ) {
584 disable_int(info, NDSR_WRDREQ);
585 if (info->use_dma) {
586 info->state = STATE_DMA_WRITING;
587 start_data_dma(info, 1);
588 } else {
589 info->state = STATE_PIO_WRITING;
590 complete(&info->cmd_complete);
591 }
592 } else if (status & (NDSR_CS0_BBD | NDSR_CS0_CMDD)) {
593 if (status & NDSR_CS0_BBD)
594 info->retcode = ERR_BBERR;
595
596 disable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
597 info->state = STATE_READY;
598 complete(&info->cmd_complete);
599 }
600 nand_writel(info, NDSR, status);
601 return IRQ_HANDLED;
602 }
603
604 static int pxa3xx_nand_do_cmd(struct pxa3xx_nand_info *info, uint32_t event)
605 {
606 uint32_t ndcr;
607 int ret, timeout = CHIP_DELAY_TIMEOUT;
608
609 if (write_cmd(info)) {
610 info->retcode = ERR_SENDCMD;
611 goto fail_stop;
612 }
613
614 info->state = STATE_CMD_HANDLE;
615
616 enable_int(info, event);
617
618 ret = wait_for_completion_timeout(&info->cmd_complete, timeout);
619 if (!ret) {
620 printk(KERN_ERR "command execution timed out\n");
621 info->retcode = ERR_SENDCMD;
622 goto fail_stop;
623 }
624
625 if (info->use_dma == 0 && info->data_size > 0)
626 if (handle_data_pio(info))
627 goto fail_stop;
628
629 return 0;
630
631 fail_stop:
632 ndcr = nand_readl(info, NDCR);
633 nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
634 udelay(10);
635 return -ETIMEDOUT;
636 }
637
638 static int pxa3xx_nand_dev_ready(struct mtd_info *mtd)
639 {
640 struct pxa3xx_nand_info *info = mtd->priv;
641 return (nand_readl(info, NDSR) & NDSR_RDY) ? 1 : 0;
642 }
643
644 static inline int is_buf_blank(uint8_t *buf, size_t len)
645 {
646 for (; len > 0; len--)
647 if (*buf++ != 0xff)
648 return 0;
649 return 1;
650 }
651
652 static void pxa3xx_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
653 int column, int page_addr)
654 {
655 struct pxa3xx_nand_info *info = mtd->priv;
656 const struct pxa3xx_nand_flash *flash_info = info->flash_info;
657 const struct pxa3xx_nand_cmdset *cmdset = flash_info->cmdset;
658 int ret;
659
660 info->use_dma = (use_dma) ? 1 : 0;
661 info->use_ecc = 0;
662 info->data_size = 0;
663 info->state = STATE_READY;
664
665 init_completion(&info->cmd_complete);
666
667 switch (command) {
668 case NAND_CMD_READOOB:
669 /* disable HW ECC to get all the OOB data */
670 info->buf_count = mtd->writesize + mtd->oobsize;
671 info->buf_start = mtd->writesize + column;
672
673 if (prepare_read_prog_cmd(info, cmdset->read1, column, page_addr))
674 break;
675
676 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ | NDSR_DBERR | NDSR_SBERR);
677
678 /* We only are OOB, so if the data has error, does not matter */
679 if (info->retcode == ERR_DBERR)
680 info->retcode = ERR_NONE;
681 break;
682
683 case NAND_CMD_READ0:
684 info->use_ecc = 1;
685 info->retcode = ERR_NONE;
686 info->buf_start = column;
687 info->buf_count = mtd->writesize + mtd->oobsize;
688 memset(info->data_buff, 0xFF, info->buf_count);
689
690 if (prepare_read_prog_cmd(info, cmdset->read1, column, page_addr))
691 break;
692
693 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ | NDSR_DBERR | NDSR_SBERR);
694
695 if (info->retcode == ERR_DBERR) {
696 /* for blank page (all 0xff), HW will calculate its ECC as
697 * 0, which is different from the ECC information within
698 * OOB, ignore such double bit errors
699 */
700 if (is_buf_blank(info->data_buff, mtd->writesize))
701 info->retcode = ERR_NONE;
702 }
703 break;
704 case NAND_CMD_SEQIN:
705 info->buf_start = column;
706 info->buf_count = mtd->writesize + mtd->oobsize;
707 memset(info->data_buff, 0xff, info->buf_count);
708
709 /* save column/page_addr for next CMD_PAGEPROG */
710 info->seqin_column = column;
711 info->seqin_page_addr = page_addr;
712 break;
713 case NAND_CMD_PAGEPROG:
714 info->use_ecc = (info->seqin_column >= mtd->writesize) ? 0 : 1;
715
716 if (prepare_read_prog_cmd(info, cmdset->program,
717 info->seqin_column, info->seqin_page_addr))
718 break;
719
720 pxa3xx_nand_do_cmd(info, NDSR_WRDREQ);
721 break;
722 case NAND_CMD_ERASE1:
723 if (prepare_erase_cmd(info, cmdset->erase, page_addr))
724 break;
725
726 pxa3xx_nand_do_cmd(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
727 break;
728 case NAND_CMD_ERASE2:
729 break;
730 case NAND_CMD_READID:
731 case NAND_CMD_STATUS:
732 info->use_dma = 0; /* force PIO read */
733 info->buf_start = 0;
734 info->buf_count = (command == NAND_CMD_READID) ?
735 info->read_id_bytes : 1;
736
737 if (prepare_other_cmd(info, (command == NAND_CMD_READID) ?
738 cmdset->read_id : cmdset->read_status))
739 break;
740
741 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ);
742 break;
743 case NAND_CMD_RESET:
744 if (prepare_other_cmd(info, cmdset->reset))
745 break;
746
747 ret = pxa3xx_nand_do_cmd(info, NDSR_CS0_CMDD);
748 if (ret == 0) {
749 int timeout = 2;
750 uint32_t ndcr;
751
752 while (timeout--) {
753 if (nand_readl(info, NDSR) & NDSR_RDY)
754 break;
755 msleep(10);
756 }
757
758 ndcr = nand_readl(info, NDCR);
759 nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
760 }
761 break;
762 default:
763 printk(KERN_ERR "non-supported command.\n");
764 break;
765 }
766
767 if (info->retcode == ERR_DBERR) {
768 printk(KERN_ERR "double bit error @ page %08x\n", page_addr);
769 info->retcode = ERR_NONE;
770 }
771 }
772
773 static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd)
774 {
775 struct pxa3xx_nand_info *info = mtd->priv;
776 char retval = 0xFF;
777
778 if (info->buf_start < info->buf_count)
779 /* Has just send a new command? */
780 retval = info->data_buff[info->buf_start++];
781
782 return retval;
783 }
784
785 static u16 pxa3xx_nand_read_word(struct mtd_info *mtd)
786 {
787 struct pxa3xx_nand_info *info = mtd->priv;
788 u16 retval = 0xFFFF;
789
790 if (!(info->buf_start & 0x01) && info->buf_start < info->buf_count) {
791 retval = *((u16 *)(info->data_buff+info->buf_start));
792 info->buf_start += 2;
793 }
794 return retval;
795 }
796
797 static void pxa3xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
798 {
799 struct pxa3xx_nand_info *info = mtd->priv;
800 int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
801
802 memcpy(buf, info->data_buff + info->buf_start, real_len);
803 info->buf_start += real_len;
804 }
805
806 static void pxa3xx_nand_write_buf(struct mtd_info *mtd,
807 const uint8_t *buf, int len)
808 {
809 struct pxa3xx_nand_info *info = mtd->priv;
810 int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
811
812 memcpy(info->data_buff + info->buf_start, buf, real_len);
813 info->buf_start += real_len;
814 }
815
816 static int pxa3xx_nand_verify_buf(struct mtd_info *mtd,
817 const uint8_t *buf, int len)
818 {
819 return 0;
820 }
821
822 static void pxa3xx_nand_select_chip(struct mtd_info *mtd, int chip)
823 {
824 return;
825 }
826
827 static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
828 {
829 struct pxa3xx_nand_info *info = mtd->priv;
830
831 /* pxa3xx_nand_send_command has waited for command complete */
832 if (this->state == FL_WRITING || this->state == FL_ERASING) {
833 if (info->retcode == ERR_NONE)
834 return 0;
835 else {
836 /*
837 * any error make it return 0x01 which will tell
838 * the caller the erase and write fail
839 */
840 return 0x01;
841 }
842 }
843
844 return 0;
845 }
846
847 static void pxa3xx_nand_ecc_hwctl(struct mtd_info *mtd, int mode)
848 {
849 return;
850 }
851
852 static int pxa3xx_nand_ecc_calculate(struct mtd_info *mtd,
853 const uint8_t *dat, uint8_t *ecc_code)
854 {
855 return 0;
856 }
857
858 static int pxa3xx_nand_ecc_correct(struct mtd_info *mtd,
859 uint8_t *dat, uint8_t *read_ecc, uint8_t *calc_ecc)
860 {
861 struct pxa3xx_nand_info *info = mtd->priv;
862 /*
863 * Any error include ERR_SEND_CMD, ERR_DBERR, ERR_BUSERR, we
864 * consider it as a ecc error which will tell the caller the
865 * read fail We have distinguish all the errors, but the
866 * nand_read_ecc only check this function return value
867 *
868 * Corrected (single-bit) errors must also be noted.
869 */
870 if (info->retcode == ERR_SBERR)
871 return 1;
872 else if (info->retcode != ERR_NONE)
873 return -1;
874
875 return 0;
876 }
877
878 static int __readid(struct pxa3xx_nand_info *info, uint32_t *id)
879 {
880 const struct pxa3xx_nand_flash *f = info->flash_info;
881 const struct pxa3xx_nand_cmdset *cmdset = f->cmdset;
882 uint32_t ndcr;
883 uint8_t id_buff[8];
884
885 if (prepare_other_cmd(info, cmdset->read_id)) {
886 printk(KERN_ERR "failed to prepare command\n");
887 return -EINVAL;
888 }
889
890 /* Send command */
891 if (write_cmd(info))
892 goto fail_timeout;
893
894 /* Wait for CMDDM(command done successfully) */
895 if (wait_for_event(info, NDSR_RDDREQ))
896 goto fail_timeout;
897
898 __raw_readsl(info->mmio_base + NDDB, id_buff, 2);
899 *id = id_buff[0] | (id_buff[1] << 8);
900 return 0;
901
902 fail_timeout:
903 ndcr = nand_readl(info, NDCR);
904 nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
905 udelay(10);
906 return -ETIMEDOUT;
907 }
908
909 static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info,
910 const struct pxa3xx_nand_flash *f)
911 {
912 struct platform_device *pdev = info->pdev;
913 struct pxa3xx_nand_platform_data *pdata = pdev->dev.platform_data;
914 uint32_t ndcr = 0x00000FFF; /* disable all interrupts */
915
916 if (f->page_size != 2048 && f->page_size != 512)
917 return -EINVAL;
918
919 if (f->flash_width != 16 && f->flash_width != 8)
920 return -EINVAL;
921
922 /* calculate flash information */
923 info->oob_size = (f->page_size == 2048) ? 64 : 16;
924 info->read_id_bytes = (f->page_size == 2048) ? 4 : 2;
925
926 /* calculate addressing information */
927 info->col_addr_cycles = (f->page_size == 2048) ? 2 : 1;
928
929 if (f->num_blocks * f->page_per_block > 65536)
930 info->row_addr_cycles = 3;
931 else
932 info->row_addr_cycles = 2;
933
934 ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0;
935 ndcr |= (info->col_addr_cycles == 2) ? NDCR_RA_START : 0;
936 ndcr |= (f->page_per_block == 64) ? NDCR_PG_PER_BLK : 0;
937 ndcr |= (f->page_size == 2048) ? NDCR_PAGE_SZ : 0;
938 ndcr |= (f->flash_width == 16) ? NDCR_DWIDTH_M : 0;
939 ndcr |= (f->dfc_width == 16) ? NDCR_DWIDTH_C : 0;
940
941 ndcr |= NDCR_RD_ID_CNT(info->read_id_bytes);
942 ndcr |= NDCR_SPARE_EN; /* enable spare by default */
943
944 info->reg_ndcr = ndcr;
945
946 pxa3xx_nand_set_timing(info, f->timing);
947 info->flash_info = f;
948 return 0;
949 }
950
951 static void pxa3xx_nand_detect_timing(struct pxa3xx_nand_info *info,
952 struct pxa3xx_nand_timing *t)
953 {
954 unsigned long nand_clk = clk_get_rate(info->clk);
955 uint32_t ndtr0 = nand_readl(info, NDTR0CS0);
956 uint32_t ndtr1 = nand_readl(info, NDTR1CS0);
957
958 t->tCH = cycle2ns(tCH_NDTR0(ndtr0), nand_clk);
959 t->tCS = cycle2ns(tCS_NDTR0(ndtr0), nand_clk);
960 t->tWH = cycle2ns(tWH_NDTR0(ndtr0), nand_clk);
961 t->tWP = cycle2ns(tWP_NDTR0(ndtr0), nand_clk);
962 t->tRH = cycle2ns(tRH_NDTR0(ndtr0), nand_clk);
963 t->tRP = cycle2ns(tRP_NDTR0(ndtr0), nand_clk);
964
965 t->tR = cycle2ns(tR_NDTR1(ndtr1), nand_clk);
966 t->tWHR = cycle2ns(tWHR_NDTR1(ndtr1), nand_clk);
967 t->tAR = cycle2ns(tAR_NDTR1(ndtr1), nand_clk);
968 }
969
970 static int pxa3xx_nand_detect_config(struct pxa3xx_nand_info *info)
971 {
972 uint32_t ndcr = nand_readl(info, NDCR);
973 struct nand_flash_dev *type = NULL;
974 uint32_t id = -1;
975 int i;
976
977 default_flash.page_per_block = ndcr & NDCR_PG_PER_BLK ? 64 : 32;
978 default_flash.page_size = ndcr & NDCR_PAGE_SZ ? 2048 : 512;
979 default_flash.flash_width = ndcr & NDCR_DWIDTH_M ? 16 : 8;
980 default_flash.dfc_width = ndcr & NDCR_DWIDTH_C ? 16 : 8;
981
982 if (default_flash.page_size == 2048)
983 default_flash.cmdset = &largepage_cmdset;
984 else
985 default_flash.cmdset = &smallpage_cmdset;
986
987 /* set info fields needed to __readid */
988 info->flash_info = &default_flash;
989 info->read_id_bytes = (default_flash.page_size == 2048) ? 4 : 2;
990 info->reg_ndcr = ndcr;
991
992 if (__readid(info, &id))
993 return -ENODEV;
994
995 /* Lookup the flash id */
996 id = (id >> 8) & 0xff; /* device id is byte 2 */
997 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
998 if (id == nand_flash_ids[i].id) {
999 type = &nand_flash_ids[i];
1000 break;
1001 }
1002 }
1003
1004 if (!type)
1005 return -ENODEV;
1006
1007 /* fill the missing flash information */
1008 i = __ffs(default_flash.page_per_block * default_flash.page_size);
1009 default_flash.num_blocks = type->chipsize << (20 - i);
1010
1011 info->oob_size = (default_flash.page_size == 2048) ? 64 : 16;
1012
1013 /* calculate addressing information */
1014 info->col_addr_cycles = (default_flash.page_size == 2048) ? 2 : 1;
1015
1016 if (default_flash.num_blocks * default_flash.page_per_block > 65536)
1017 info->row_addr_cycles = 3;
1018 else
1019 info->row_addr_cycles = 2;
1020
1021 pxa3xx_nand_detect_timing(info, &default_timing);
1022 default_flash.timing = &default_timing;
1023
1024 return 0;
1025 }
1026
1027 static int pxa3xx_nand_detect_flash(struct pxa3xx_nand_info *info,
1028 const struct pxa3xx_nand_platform_data *pdata)
1029 {
1030 const struct pxa3xx_nand_flash *f;
1031 uint32_t id = -1;
1032 int i;
1033
1034 if (pdata->keep_config)
1035 if (pxa3xx_nand_detect_config(info) == 0)
1036 return 0;
1037
1038 for (i = 0; i<pdata->num_flash; ++i) {
1039 f = pdata->flash + i;
1040
1041 if (pxa3xx_nand_config_flash(info, f))
1042 continue;
1043
1044 if (__readid(info, &id))
1045 continue;
1046
1047 if (id == f->chip_id)
1048 return 0;
1049 }
1050
1051 #ifdef CONFIG_MTD_NAND_PXA3xx_BUILTIN
1052 for (i = 0; i < ARRAY_SIZE(builtin_flash_types); i++) {
1053
1054 f = builtin_flash_types[i];
1055
1056 if (pxa3xx_nand_config_flash(info, f))
1057 continue;
1058
1059 if (__readid(info, &id))
1060 continue;
1061
1062 if (id == f->chip_id)
1063 return 0;
1064 }
1065 #endif
1066
1067 dev_warn(&info->pdev->dev,
1068 "failed to detect configured nand flash; found %04x instead of\n",
1069 id);
1070 return -ENODEV;
1071 }
1072
1073 /* the maximum possible buffer size for large page with OOB data
1074 * is: 2048 + 64 = 2112 bytes, allocate a page here for both the
1075 * data buffer and the DMA descriptor
1076 */
1077 #define MAX_BUFF_SIZE PAGE_SIZE
1078
1079 static int pxa3xx_nand_init_buff(struct pxa3xx_nand_info *info)
1080 {
1081 struct platform_device *pdev = info->pdev;
1082 int data_desc_offset = MAX_BUFF_SIZE - sizeof(struct pxa_dma_desc);
1083
1084 if (use_dma == 0) {
1085 info->data_buff = kmalloc(MAX_BUFF_SIZE, GFP_KERNEL);
1086 if (info->data_buff == NULL)
1087 return -ENOMEM;
1088 return 0;
1089 }
1090
1091 info->data_buff = dma_alloc_coherent(&pdev->dev, MAX_BUFF_SIZE,
1092 &info->data_buff_phys, GFP_KERNEL);
1093 if (info->data_buff == NULL) {
1094 dev_err(&pdev->dev, "failed to allocate dma buffer\n");
1095 return -ENOMEM;
1096 }
1097
1098 info->data_buff_size = MAX_BUFF_SIZE;
1099 info->data_desc = (void *)info->data_buff + data_desc_offset;
1100 info->data_desc_addr = info->data_buff_phys + data_desc_offset;
1101
1102 info->data_dma_ch = pxa_request_dma("nand-data", DMA_PRIO_LOW,
1103 pxa3xx_nand_data_dma_irq, info);
1104 if (info->data_dma_ch < 0) {
1105 dev_err(&pdev->dev, "failed to request data dma\n");
1106 dma_free_coherent(&pdev->dev, info->data_buff_size,
1107 info->data_buff, info->data_buff_phys);
1108 return info->data_dma_ch;
1109 }
1110
1111 return 0;
1112 }
1113
1114 static struct nand_ecclayout hw_smallpage_ecclayout = {
1115 .eccbytes = 6,
1116 .eccpos = {8, 9, 10, 11, 12, 13 },
1117 .oobfree = { {2, 6} }
1118 };
1119
1120 static struct nand_ecclayout hw_largepage_ecclayout = {
1121 .eccbytes = 24,
1122 .eccpos = {
1123 40, 41, 42, 43, 44, 45, 46, 47,
1124 48, 49, 50, 51, 52, 53, 54, 55,
1125 56, 57, 58, 59, 60, 61, 62, 63},
1126 .oobfree = { {2, 38} }
1127 };
1128
1129 static void pxa3xx_nand_init_mtd(struct mtd_info *mtd,
1130 struct pxa3xx_nand_info *info)
1131 {
1132 const struct pxa3xx_nand_flash *f = info->flash_info;
1133 struct nand_chip *this = &info->nand_chip;
1134
1135 this->options = (f->flash_width == 16) ? NAND_BUSWIDTH_16: 0;
1136
1137 this->waitfunc = pxa3xx_nand_waitfunc;
1138 this->select_chip = pxa3xx_nand_select_chip;
1139 this->dev_ready = pxa3xx_nand_dev_ready;
1140 this->cmdfunc = pxa3xx_nand_cmdfunc;
1141 this->read_word = pxa3xx_nand_read_word;
1142 this->read_byte = pxa3xx_nand_read_byte;
1143 this->read_buf = pxa3xx_nand_read_buf;
1144 this->write_buf = pxa3xx_nand_write_buf;
1145 this->verify_buf = pxa3xx_nand_verify_buf;
1146
1147 this->ecc.mode = NAND_ECC_HW;
1148 this->ecc.hwctl = pxa3xx_nand_ecc_hwctl;
1149 this->ecc.calculate = pxa3xx_nand_ecc_calculate;
1150 this->ecc.correct = pxa3xx_nand_ecc_correct;
1151 this->ecc.size = f->page_size;
1152
1153 if (f->page_size == 2048)
1154 this->ecc.layout = &hw_largepage_ecclayout;
1155 else
1156 this->ecc.layout = &hw_smallpage_ecclayout;
1157
1158 this->chip_delay = 25;
1159 }
1160
1161 static int pxa3xx_nand_probe(struct platform_device *pdev)
1162 {
1163 struct pxa3xx_nand_platform_data *pdata;
1164 struct pxa3xx_nand_info *info;
1165 struct nand_chip *this;
1166 struct mtd_info *mtd;
1167 struct resource *r;
1168 int ret = 0, irq;
1169
1170 pdata = pdev->dev.platform_data;
1171
1172 if (!pdata) {
1173 dev_err(&pdev->dev, "no platform data defined\n");
1174 return -ENODEV;
1175 }
1176
1177 mtd = kzalloc(sizeof(struct mtd_info) + sizeof(struct pxa3xx_nand_info),
1178 GFP_KERNEL);
1179 if (!mtd) {
1180 dev_err(&pdev->dev, "failed to allocate memory\n");
1181 return -ENOMEM;
1182 }
1183
1184 info = (struct pxa3xx_nand_info *)(&mtd[1]);
1185 info->pdev = pdev;
1186
1187 this = &info->nand_chip;
1188 mtd->priv = info;
1189 mtd->owner = THIS_MODULE;
1190
1191 info->clk = clk_get(&pdev->dev, NULL);
1192 if (IS_ERR(info->clk)) {
1193 dev_err(&pdev->dev, "failed to get nand clock\n");
1194 ret = PTR_ERR(info->clk);
1195 goto fail_free_mtd;
1196 }
1197 clk_enable(info->clk);
1198
1199 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1200 if (r == NULL) {
1201 dev_err(&pdev->dev, "no resource defined for data DMA\n");
1202 ret = -ENXIO;
1203 goto fail_put_clk;
1204 }
1205 info->drcmr_dat = r->start;
1206
1207 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1208 if (r == NULL) {
1209 dev_err(&pdev->dev, "no resource defined for command DMA\n");
1210 ret = -ENXIO;
1211 goto fail_put_clk;
1212 }
1213 info->drcmr_cmd = r->start;
1214
1215 irq = platform_get_irq(pdev, 0);
1216 if (irq < 0) {
1217 dev_err(&pdev->dev, "no IRQ resource defined\n");
1218 ret = -ENXIO;
1219 goto fail_put_clk;
1220 }
1221
1222 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1223 if (r == NULL) {
1224 dev_err(&pdev->dev, "no IO memory resource defined\n");
1225 ret = -ENODEV;
1226 goto fail_put_clk;
1227 }
1228
1229 r = request_mem_region(r->start, resource_size(r), pdev->name);
1230 if (r == NULL) {
1231 dev_err(&pdev->dev, "failed to request memory resource\n");
1232 ret = -EBUSY;
1233 goto fail_put_clk;
1234 }
1235
1236 info->mmio_base = ioremap(r->start, resource_size(r));
1237 if (info->mmio_base == NULL) {
1238 dev_err(&pdev->dev, "ioremap() failed\n");
1239 ret = -ENODEV;
1240 goto fail_free_res;
1241 }
1242
1243 ret = pxa3xx_nand_init_buff(info);
1244 if (ret)
1245 goto fail_free_io;
1246
1247 ret = request_irq(IRQ_NAND, pxa3xx_nand_irq, IRQF_DISABLED,
1248 pdev->name, info);
1249 if (ret < 0) {
1250 dev_err(&pdev->dev, "failed to request IRQ\n");
1251 goto fail_free_buf;
1252 }
1253
1254 ret = pxa3xx_nand_detect_flash(info, pdata);
1255 if (ret) {
1256 dev_err(&pdev->dev, "failed to detect flash\n");
1257 ret = -ENODEV;
1258 goto fail_free_irq;
1259 }
1260
1261 pxa3xx_nand_init_mtd(mtd, info);
1262
1263 platform_set_drvdata(pdev, mtd);
1264
1265 if (nand_scan(mtd, 1)) {
1266 dev_err(&pdev->dev, "failed to scan nand\n");
1267 ret = -ENXIO;
1268 goto fail_free_irq;
1269 }
1270
1271 return add_mtd_partitions(mtd, pdata->parts, pdata->nr_parts);
1272
1273 fail_free_irq:
1274 free_irq(IRQ_NAND, info);
1275 fail_free_buf:
1276 if (use_dma) {
1277 pxa_free_dma(info->data_dma_ch);
1278 dma_free_coherent(&pdev->dev, info->data_buff_size,
1279 info->data_buff, info->data_buff_phys);
1280 } else
1281 kfree(info->data_buff);
1282 fail_free_io:
1283 iounmap(info->mmio_base);
1284 fail_free_res:
1285 release_mem_region(r->start, resource_size(r));
1286 fail_put_clk:
1287 clk_disable(info->clk);
1288 clk_put(info->clk);
1289 fail_free_mtd:
1290 kfree(mtd);
1291 return ret;
1292 }
1293
1294 static int pxa3xx_nand_remove(struct platform_device *pdev)
1295 {
1296 struct mtd_info *mtd = platform_get_drvdata(pdev);
1297 struct pxa3xx_nand_info *info = mtd->priv;
1298 struct resource *r;
1299
1300 platform_set_drvdata(pdev, NULL);
1301
1302 del_mtd_device(mtd);
1303 del_mtd_partitions(mtd);
1304 free_irq(IRQ_NAND, info);
1305 if (use_dma) {
1306 pxa_free_dma(info->data_dma_ch);
1307 dma_free_writecombine(&pdev->dev, info->data_buff_size,
1308 info->data_buff, info->data_buff_phys);
1309 } else
1310 kfree(info->data_buff);
1311
1312 iounmap(info->mmio_base);
1313 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1314 release_mem_region(r->start, resource_size(r));
1315
1316 clk_disable(info->clk);
1317 clk_put(info->clk);
1318
1319 kfree(mtd);
1320 return 0;
1321 }
1322
1323 #ifdef CONFIG_PM
1324 static int pxa3xx_nand_suspend(struct platform_device *pdev, pm_message_t state)
1325 {
1326 struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
1327 struct pxa3xx_nand_info *info = mtd->priv;
1328
1329 if (info->state != STATE_READY) {
1330 dev_err(&pdev->dev, "driver busy, state = %d\n", info->state);
1331 return -EAGAIN;
1332 }
1333
1334 return 0;
1335 }
1336
1337 static int pxa3xx_nand_resume(struct platform_device *pdev)
1338 {
1339 struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
1340 struct pxa3xx_nand_info *info = mtd->priv;
1341
1342 clk_enable(info->clk);
1343
1344 return pxa3xx_nand_config_flash(info, info->flash_info);
1345 }
1346 #else
1347 #define pxa3xx_nand_suspend NULL
1348 #define pxa3xx_nand_resume NULL
1349 #endif
1350
1351 static struct platform_driver pxa3xx_nand_driver = {
1352 .driver = {
1353 .name = "pxa3xx-nand",
1354 },
1355 .probe = pxa3xx_nand_probe,
1356 .remove = pxa3xx_nand_remove,
1357 .suspend = pxa3xx_nand_suspend,
1358 .resume = pxa3xx_nand_resume,
1359 };
1360
1361 static int __init pxa3xx_nand_init(void)
1362 {
1363 return platform_driver_register(&pxa3xx_nand_driver);
1364 }
1365 module_init(pxa3xx_nand_init);
1366
1367 static void __exit pxa3xx_nand_exit(void)
1368 {
1369 platform_driver_unregister(&pxa3xx_nand_driver);
1370 }
1371 module_exit(pxa3xx_nand_exit);
1372
1373 MODULE_LICENSE("GPL");
1374 MODULE_DESCRIPTION("PXA3xx NAND controller driver");
Linux kernel - Deliverables
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