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libata: fix oops when LPM is used with PMP
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mtd / nand / pxa3xx_nand.c
blobea2c288df3f6b31490f536202d737c323189c43c
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/kernel.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/platform_device.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/delay.h>
18 #include <linux/clk.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/mtd/nand.h>
21 #include <linux/mtd/partitions.h>
22 #include <linux/io.h>
23 #include <linux/irq.h>
24 #include <linux/slab.h>
25
26 #include <mach/dma.h>
27 #include <plat/pxa3xx_nand.h>
28
29 #define CHIP_DELAY_TIMEOUT (2 * HZ/10)
30
31 /* registers and bit definitions */
32 #define NDCR (0x00) /* Control register */
33 #define NDTR0CS0 (0x04) /* Timing Parameter 0 for CS0 */
34 #define NDTR1CS0 (0x0C) /* Timing Parameter 1 for CS0 */
35 #define NDSR (0x14) /* Status Register */
36 #define NDPCR (0x18) /* Page Count Register */
37 #define NDBDR0 (0x1C) /* Bad Block Register 0 */
38 #define NDBDR1 (0x20) /* Bad Block Register 1 */
39 #define NDDB (0x40) /* Data Buffer */
40 #define NDCB0 (0x48) /* Command Buffer0 */
41 #define NDCB1 (0x4C) /* Command Buffer1 */
42 #define NDCB2 (0x50) /* Command Buffer2 */
43
44 #define NDCR_SPARE_EN (0x1 << 31)
45 #define NDCR_ECC_EN (0x1 << 30)
46 #define NDCR_DMA_EN (0x1 << 29)
47 #define NDCR_ND_RUN (0x1 << 28)
48 #define NDCR_DWIDTH_C (0x1 << 27)
49 #define NDCR_DWIDTH_M (0x1 << 26)
50 #define NDCR_PAGE_SZ (0x1 << 24)
51 #define NDCR_NCSX (0x1 << 23)
52 #define NDCR_ND_MODE (0x3 << 21)
53 #define NDCR_NAND_MODE (0x0)
54 #define NDCR_CLR_PG_CNT (0x1 << 20)
55 #define NDCR_CLR_ECC (0x1 << 19)
56 #define NDCR_RD_ID_CNT_MASK (0x7 << 16)
57 #define NDCR_RD_ID_CNT(x) (((x) << 16) & NDCR_RD_ID_CNT_MASK)
58
59 #define NDCR_RA_START (0x1 << 15)
60 #define NDCR_PG_PER_BLK (0x1 << 14)
61 #define NDCR_ND_ARB_EN (0x1 << 12)
62
63 #define NDSR_MASK (0xfff)
64 #define NDSR_RDY (0x1 << 11)
65 #define NDSR_CS0_PAGED (0x1 << 10)
66 #define NDSR_CS1_PAGED (0x1 << 9)
67 #define NDSR_CS0_CMDD (0x1 << 8)
68 #define NDSR_CS1_CMDD (0x1 << 7)
69 #define NDSR_CS0_BBD (0x1 << 6)
70 #define NDSR_CS1_BBD (0x1 << 5)
71 #define NDSR_DBERR (0x1 << 4)
72 #define NDSR_SBERR (0x1 << 3)
73 #define NDSR_WRDREQ (0x1 << 2)
74 #define NDSR_RDDREQ (0x1 << 1)
75 #define NDSR_WRCMDREQ (0x1)
76
77 #define NDCB0_AUTO_RS (0x1 << 25)
78 #define NDCB0_CSEL (0x1 << 24)
79 #define NDCB0_CMD_TYPE_MASK (0x7 << 21)
80 #define NDCB0_CMD_TYPE(x) (((x) << 21) & NDCB0_CMD_TYPE_MASK)
81 #define NDCB0_NC (0x1 << 20)
82 #define NDCB0_DBC (0x1 << 19)
83 #define NDCB0_ADDR_CYC_MASK (0x7 << 16)
84 #define NDCB0_ADDR_CYC(x) (((x) << 16) & NDCB0_ADDR_CYC_MASK)
85 #define NDCB0_CMD2_MASK (0xff << 8)
86 #define NDCB0_CMD1_MASK (0xff)
87 #define NDCB0_ADDR_CYC_SHIFT (16)
88
89 /* macros for registers read/write */
90 #define nand_writel(info, off, val) \
91 __raw_writel((val), (info)->mmio_base + (off))
92
93 #define nand_readl(info, off) \
94 __raw_readl((info)->mmio_base + (off))
95
96 /* error code and state */
97 enum {
98 ERR_NONE = 0,
99 ERR_DMABUSERR = -1,
100 ERR_SENDCMD = -2,
101 ERR_DBERR = -3,
102 ERR_BBERR = -4,
103 ERR_SBERR = -5,
104 };
105
106 enum {
107 STATE_READY = 0,
108 STATE_CMD_HANDLE,
109 STATE_DMA_READING,
110 STATE_DMA_WRITING,
111 STATE_DMA_DONE,
112 STATE_PIO_READING,
113 STATE_PIO_WRITING,
114 };
115
116 struct pxa3xx_nand_info {
117 struct nand_chip nand_chip;
118
119 struct platform_device *pdev;
120 struct pxa3xx_nand_cmdset *cmdset;
121
122 struct clk *clk;
123 void __iomem *mmio_base;
124 unsigned long mmio_phys;
125
126 unsigned int buf_start;
127 unsigned int buf_count;
128
129 /* DMA information */
130 int drcmr_dat;
131 int drcmr_cmd;
132
133 unsigned char *data_buff;
134 unsigned char *oob_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 unsigned int page_size; /* page size of attached chip */
154 unsigned int data_size; /* data size in FIFO */
155 int retcode;
156 struct completion cmd_complete;
157
158 /* generated NDCBx register values */
159 uint32_t ndcb0;
160 uint32_t ndcb1;
161 uint32_t ndcb2;
162
163 /* timing calcuted from setting */
164 uint32_t ndtr0cs0;
165 uint32_t ndtr1cs0;
166
167 /* calculated from pxa3xx_nand_flash data */
168 size_t oob_size;
169 size_t read_id_bytes;
170
171 unsigned int col_addr_cycles;
172 unsigned int row_addr_cycles;
173 };
174
175 static int use_dma = 1;
176 module_param(use_dma, bool, 0444);
177 MODULE_PARM_DESC(use_dma, "enable DMA for data transfering to/from NAND HW");
178
179 /*
180 * Default NAND flash controller configuration setup by the
181 * bootloader. This configuration is used only when pdata->keep_config is set
182 */
183 static struct pxa3xx_nand_cmdset default_cmdset = {
184 .read1 = 0x3000,
185 .read2 = 0x0050,
186 .program = 0x1080,
187 .read_status = 0x0070,
188 .read_id = 0x0090,
189 .erase = 0xD060,
190 .reset = 0x00FF,
191 .lock = 0x002A,
192 .unlock = 0x2423,
193 .lock_status = 0x007A,
194 };
195
196 static struct pxa3xx_nand_timing timing[] = {
197 { 40, 80, 60, 100, 80, 100, 90000, 400, 40, },
198 { 10, 0, 20, 40, 30, 40, 11123, 110, 10, },
199 { 10, 25, 15, 25, 15, 30, 25000, 60, 10, },
200 { 10, 35, 15, 25, 15, 25, 25000, 60, 10, },
201 };
202
203 static struct pxa3xx_nand_flash builtin_flash_types[] = {
204 { 0, 0, 2048, 8, 8, 0, &default_cmdset, &timing[0] },
205 { 0x46ec, 32, 512, 16, 16, 4096, &default_cmdset, &timing[1] },
206 { 0xdaec, 64, 2048, 8, 8, 2048, &default_cmdset, &timing[1] },
207 { 0xd7ec, 128, 4096, 8, 8, 8192, &default_cmdset, &timing[1] },
208 { 0xa12c, 64, 2048, 8, 8, 1024, &default_cmdset, &timing[2] },
209 { 0xb12c, 64, 2048, 16, 16, 1024, &default_cmdset, &timing[2] },
210 { 0xdc2c, 64, 2048, 8, 8, 4096, &default_cmdset, &timing[2] },
211 { 0xcc2c, 64, 2048, 16, 16, 4096, &default_cmdset, &timing[2] },
212 { 0xba20, 64, 2048, 16, 16, 2048, &default_cmdset, &timing[3] },
213 };
214
215 /* Define a default flash type setting serve as flash detecting only */
216 #define DEFAULT_FLASH_TYPE (&builtin_flash_types[0])
217
218 #define NDTR0_tCH(c) (min((c), 7) << 19)
219 #define NDTR0_tCS(c) (min((c), 7) << 16)
220 #define NDTR0_tWH(c) (min((c), 7) << 11)
221 #define NDTR0_tWP(c) (min((c), 7) << 8)
222 #define NDTR0_tRH(c) (min((c), 7) << 3)
223 #define NDTR0_tRP(c) (min((c), 7) << 0)
224
225 #define NDTR1_tR(c) (min((c), 65535) << 16)
226 #define NDTR1_tWHR(c) (min((c), 15) << 4)
227 #define NDTR1_tAR(c) (min((c), 15) << 0)
228
229 /* convert nano-seconds to nand flash controller clock cycles */
230 #define ns2cycle(ns, clk) (int)((ns) * (clk / 1000000) / 1000)
231
232 static void pxa3xx_nand_set_timing(struct pxa3xx_nand_info *info,
233 const struct pxa3xx_nand_timing *t)
234 {
235 unsigned long nand_clk = clk_get_rate(info->clk);
236 uint32_t ndtr0, ndtr1;
237
238 ndtr0 = NDTR0_tCH(ns2cycle(t->tCH, nand_clk)) |
239 NDTR0_tCS(ns2cycle(t->tCS, nand_clk)) |
240 NDTR0_tWH(ns2cycle(t->tWH, nand_clk)) |
241 NDTR0_tWP(ns2cycle(t->tWP, nand_clk)) |
242 NDTR0_tRH(ns2cycle(t->tRH, nand_clk)) |
243 NDTR0_tRP(ns2cycle(t->tRP, nand_clk));
244
245 ndtr1 = NDTR1_tR(ns2cycle(t->tR, nand_clk)) |
246 NDTR1_tWHR(ns2cycle(t->tWHR, nand_clk)) |
247 NDTR1_tAR(ns2cycle(t->tAR, nand_clk));
248
249 info->ndtr0cs0 = ndtr0;
250 info->ndtr1cs0 = ndtr1;
251 nand_writel(info, NDTR0CS0, ndtr0);
252 nand_writel(info, NDTR1CS0, ndtr1);
253 }
254
255 #define WAIT_EVENT_TIMEOUT 10
256
257 static int wait_for_event(struct pxa3xx_nand_info *info, uint32_t event)
258 {
259 int timeout = WAIT_EVENT_TIMEOUT;
260 uint32_t ndsr;
261
262 while (timeout--) {
263 ndsr = nand_readl(info, NDSR) & NDSR_MASK;
264 if (ndsr & event) {
265 nand_writel(info, NDSR, ndsr);
266 return 0;
267 }
268 udelay(10);
269 }
270
271 return -ETIMEDOUT;
272 }
273
274 static void pxa3xx_set_datasize(struct pxa3xx_nand_info *info)
275 {
276 int oob_enable = info->reg_ndcr & NDCR_SPARE_EN;
277
278 info->data_size = info->page_size;
279 if (!oob_enable) {
280 info->oob_size = 0;
281 return;
282 }
283
284 switch (info->page_size) {
285 case 2048:
286 info->oob_size = (info->use_ecc) ? 40 : 64;
287 break;
288 case 512:
289 info->oob_size = (info->use_ecc) ? 8 : 16;
290 break;
291 }
292 }
293
294 static int prepare_read_prog_cmd(struct pxa3xx_nand_info *info,
295 uint16_t cmd, int column, int page_addr)
296 {
297 const struct pxa3xx_nand_cmdset *cmdset = info->cmdset;
298 pxa3xx_set_datasize(info);
299
300 /* generate values for NDCBx registers */
301 info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
302 info->ndcb1 = 0;
303 info->ndcb2 = 0;
304 info->ndcb0 |= NDCB0_ADDR_CYC(info->row_addr_cycles + info->col_addr_cycles);
305
306 if (info->col_addr_cycles == 2) {
307 /* large block, 2 cycles for column address
308 * row address starts from 3rd cycle
309 */
310 info->ndcb1 |= page_addr << 16;
311 if (info->row_addr_cycles == 3)
312 info->ndcb2 = (page_addr >> 16) & 0xff;
313 } else
314 /* small block, 1 cycles for column address
315 * row address starts from 2nd cycle
316 */
317 info->ndcb1 = page_addr << 8;
318
319 if (cmd == cmdset->program)
320 info->ndcb0 |= NDCB0_CMD_TYPE(1) | NDCB0_AUTO_RS;
321
322 return 0;
323 }
324
325 static int prepare_erase_cmd(struct pxa3xx_nand_info *info,
326 uint16_t cmd, int page_addr)
327 {
328 info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
329 info->ndcb0 |= NDCB0_CMD_TYPE(2) | NDCB0_AUTO_RS | NDCB0_ADDR_CYC(3);
330 info->ndcb1 = page_addr;
331 info->ndcb2 = 0;
332 return 0;
333 }
334
335 static int prepare_other_cmd(struct pxa3xx_nand_info *info, uint16_t cmd)
336 {
337 const struct pxa3xx_nand_cmdset *cmdset = info->cmdset;
338
339 info->ndcb0 = cmd | ((cmd & 0xff00) ? NDCB0_DBC : 0);
340 info->ndcb1 = 0;
341 info->ndcb2 = 0;
342
343 info->oob_size = 0;
344 if (cmd == cmdset->read_id) {
345 info->ndcb0 |= NDCB0_CMD_TYPE(3);
346 info->data_size = 8;
347 } else if (cmd == cmdset->read_status) {
348 info->ndcb0 |= NDCB0_CMD_TYPE(4);
349 info->data_size = 8;
350 } else if (cmd == cmdset->reset || cmd == cmdset->lock ||
351 cmd == cmdset->unlock) {
352 info->ndcb0 |= NDCB0_CMD_TYPE(5);
353 } else
354 return -EINVAL;
355
356 return 0;
357 }
358
359 static void enable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
360 {
361 uint32_t ndcr;
362
363 ndcr = nand_readl(info, NDCR);
364 nand_writel(info, NDCR, ndcr & ~int_mask);
365 }
366
367 static void disable_int(struct pxa3xx_nand_info *info, uint32_t int_mask)
368 {
369 uint32_t ndcr;
370
371 ndcr = nand_readl(info, NDCR);
372 nand_writel(info, NDCR, ndcr | int_mask);
373 }
374
375 /* NOTE: it is a must to set ND_RUN firstly, then write command buffer
376 * otherwise, it does not work
377 */
378 static int write_cmd(struct pxa3xx_nand_info *info)
379 {
380 uint32_t ndcr;
381
382 /* clear status bits and run */
383 nand_writel(info, NDSR, NDSR_MASK);
384
385 ndcr = info->reg_ndcr;
386
387 ndcr |= info->use_ecc ? NDCR_ECC_EN : 0;
388 ndcr |= info->use_dma ? NDCR_DMA_EN : 0;
389 ndcr |= NDCR_ND_RUN;
390
391 nand_writel(info, NDCR, ndcr);
392
393 if (wait_for_event(info, NDSR_WRCMDREQ)) {
394 printk(KERN_ERR "timed out writing command\n");
395 return -ETIMEDOUT;
396 }
397
398 nand_writel(info, NDCB0, info->ndcb0);
399 nand_writel(info, NDCB0, info->ndcb1);
400 nand_writel(info, NDCB0, info->ndcb2);
401 return 0;
402 }
403
404 static int handle_data_pio(struct pxa3xx_nand_info *info)
405 {
406 int ret, timeout = CHIP_DELAY_TIMEOUT;
407
408 switch (info->state) {
409 case STATE_PIO_WRITING:
410 __raw_writesl(info->mmio_base + NDDB, info->data_buff,
411 DIV_ROUND_UP(info->data_size, 4));
412 if (info->oob_size > 0)
413 __raw_writesl(info->mmio_base + NDDB, info->oob_buff,
414 DIV_ROUND_UP(info->oob_size, 4));
415
416 enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
417
418 ret = wait_for_completion_timeout(&info->cmd_complete, timeout);
419 if (!ret) {
420 printk(KERN_ERR "program command time out\n");
421 return -1;
422 }
423 break;
424 case STATE_PIO_READING:
425 __raw_readsl(info->mmio_base + NDDB, info->data_buff,
426 DIV_ROUND_UP(info->data_size, 4));
427 if (info->oob_size > 0)
428 __raw_readsl(info->mmio_base + NDDB, info->oob_buff,
429 DIV_ROUND_UP(info->oob_size, 4));
430 break;
431 default:
432 printk(KERN_ERR "%s: invalid state %d\n", __func__,
433 info->state);
434 return -EINVAL;
435 }
436
437 info->state = STATE_READY;
438 return 0;
439 }
440
441 static void start_data_dma(struct pxa3xx_nand_info *info, int dir_out)
442 {
443 struct pxa_dma_desc *desc = info->data_desc;
444 int dma_len = ALIGN(info->data_size + info->oob_size, 32);
445
446 desc->ddadr = DDADR_STOP;
447 desc->dcmd = DCMD_ENDIRQEN | DCMD_WIDTH4 | DCMD_BURST32 | dma_len;
448
449 if (dir_out) {
450 desc->dsadr = info->data_buff_phys;
451 desc->dtadr = info->mmio_phys + NDDB;
452 desc->dcmd |= DCMD_INCSRCADDR | DCMD_FLOWTRG;
453 } else {
454 desc->dtadr = info->data_buff_phys;
455 desc->dsadr = info->mmio_phys + NDDB;
456 desc->dcmd |= DCMD_INCTRGADDR | DCMD_FLOWSRC;
457 }
458
459 DRCMR(info->drcmr_dat) = DRCMR_MAPVLD | info->data_dma_ch;
460 DDADR(info->data_dma_ch) = info->data_desc_addr;
461 DCSR(info->data_dma_ch) |= DCSR_RUN;
462 }
463
464 static void pxa3xx_nand_data_dma_irq(int channel, void *data)
465 {
466 struct pxa3xx_nand_info *info = data;
467 uint32_t dcsr;
468
469 dcsr = DCSR(channel);
470 DCSR(channel) = dcsr;
471
472 if (dcsr & DCSR_BUSERR) {
473 info->retcode = ERR_DMABUSERR;
474 complete(&info->cmd_complete);
475 }
476
477 if (info->state == STATE_DMA_WRITING) {
478 info->state = STATE_DMA_DONE;
479 enable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
480 } else {
481 info->state = STATE_READY;
482 complete(&info->cmd_complete);
483 }
484 }
485
486 static irqreturn_t pxa3xx_nand_irq(int irq, void *devid)
487 {
488 struct pxa3xx_nand_info *info = devid;
489 unsigned int status;
490
491 status = nand_readl(info, NDSR);
492
493 if (status & (NDSR_RDDREQ | NDSR_DBERR | NDSR_SBERR)) {
494 if (status & NDSR_DBERR)
495 info->retcode = ERR_DBERR;
496 else if (status & NDSR_SBERR)
497 info->retcode = ERR_SBERR;
498
499 disable_int(info, NDSR_RDDREQ | NDSR_DBERR | NDSR_SBERR);
500
501 if (info->use_dma) {
502 info->state = STATE_DMA_READING;
503 start_data_dma(info, 0);
504 } else {
505 info->state = STATE_PIO_READING;
506 complete(&info->cmd_complete);
507 }
508 } else if (status & NDSR_WRDREQ) {
509 disable_int(info, NDSR_WRDREQ);
510 if (info->use_dma) {
511 info->state = STATE_DMA_WRITING;
512 start_data_dma(info, 1);
513 } else {
514 info->state = STATE_PIO_WRITING;
515 complete(&info->cmd_complete);
516 }
517 } else if (status & (NDSR_CS0_BBD | NDSR_CS0_CMDD)) {
518 if (status & NDSR_CS0_BBD)
519 info->retcode = ERR_BBERR;
520
521 disable_int(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
522 info->state = STATE_READY;
523 complete(&info->cmd_complete);
524 }
525 nand_writel(info, NDSR, status);
526 return IRQ_HANDLED;
527 }
528
529 static int pxa3xx_nand_do_cmd(struct pxa3xx_nand_info *info, uint32_t event)
530 {
531 uint32_t ndcr;
532 int ret, timeout = CHIP_DELAY_TIMEOUT;
533
534 if (write_cmd(info)) {
535 info->retcode = ERR_SENDCMD;
536 goto fail_stop;
537 }
538
539 info->state = STATE_CMD_HANDLE;
540
541 enable_int(info, event);
542
543 ret = wait_for_completion_timeout(&info->cmd_complete, timeout);
544 if (!ret) {
545 printk(KERN_ERR "command execution timed out\n");
546 info->retcode = ERR_SENDCMD;
547 goto fail_stop;
548 }
549
550 if (info->use_dma == 0 && info->data_size > 0)
551 if (handle_data_pio(info))
552 goto fail_stop;
553
554 return 0;
555
556 fail_stop:
557 ndcr = nand_readl(info, NDCR);
558 nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
559 udelay(10);
560 return -ETIMEDOUT;
561 }
562
563 static int pxa3xx_nand_dev_ready(struct mtd_info *mtd)
564 {
565 struct pxa3xx_nand_info *info = mtd->priv;
566 return (nand_readl(info, NDSR) & NDSR_RDY) ? 1 : 0;
567 }
568
569 static inline int is_buf_blank(uint8_t *buf, size_t len)
570 {
571 for (; len > 0; len--)
572 if (*buf++ != 0xff)
573 return 0;
574 return 1;
575 }
576
577 static void pxa3xx_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
578 int column, int page_addr)
579 {
580 struct pxa3xx_nand_info *info = mtd->priv;
581 const struct pxa3xx_nand_cmdset *cmdset = info->cmdset;
582 int ret;
583
584 info->use_dma = (use_dma) ? 1 : 0;
585 info->use_ecc = 0;
586 info->data_size = 0;
587 info->state = STATE_READY;
588
589 init_completion(&info->cmd_complete);
590
591 switch (command) {
592 case NAND_CMD_READOOB:
593 /* disable HW ECC to get all the OOB data */
594 info->buf_count = mtd->writesize + mtd->oobsize;
595 info->buf_start = mtd->writesize + column;
596 memset(info->data_buff, 0xFF, info->buf_count);
597
598 if (prepare_read_prog_cmd(info, cmdset->read1, column, page_addr))
599 break;
600
601 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ | NDSR_DBERR | NDSR_SBERR);
602
603 /* We only are OOB, so if the data has error, does not matter */
604 if (info->retcode == ERR_DBERR)
605 info->retcode = ERR_NONE;
606 break;
607
608 case NAND_CMD_READ0:
609 info->use_ecc = 1;
610 info->retcode = ERR_NONE;
611 info->buf_start = column;
612 info->buf_count = mtd->writesize + mtd->oobsize;
613 memset(info->data_buff, 0xFF, info->buf_count);
614
615 if (prepare_read_prog_cmd(info, cmdset->read1, column, page_addr))
616 break;
617
618 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ | NDSR_DBERR | NDSR_SBERR);
619
620 if (info->retcode == ERR_DBERR) {
621 /* for blank page (all 0xff), HW will calculate its ECC as
622 * 0, which is different from the ECC information within
623 * OOB, ignore such double bit errors
624 */
625 if (is_buf_blank(info->data_buff, mtd->writesize))
626 info->retcode = ERR_NONE;
627 }
628 break;
629 case NAND_CMD_SEQIN:
630 info->buf_start = column;
631 info->buf_count = mtd->writesize + mtd->oobsize;
632 memset(info->data_buff, 0xff, info->buf_count);
633
634 /* save column/page_addr for next CMD_PAGEPROG */
635 info->seqin_column = column;
636 info->seqin_page_addr = page_addr;
637 break;
638 case NAND_CMD_PAGEPROG:
639 info->use_ecc = (info->seqin_column >= mtd->writesize) ? 0 : 1;
640
641 if (prepare_read_prog_cmd(info, cmdset->program,
642 info->seqin_column, info->seqin_page_addr))
643 break;
644
645 pxa3xx_nand_do_cmd(info, NDSR_WRDREQ);
646 break;
647 case NAND_CMD_ERASE1:
648 if (prepare_erase_cmd(info, cmdset->erase, page_addr))
649 break;
650
651 pxa3xx_nand_do_cmd(info, NDSR_CS0_BBD | NDSR_CS0_CMDD);
652 break;
653 case NAND_CMD_ERASE2:
654 break;
655 case NAND_CMD_READID:
656 case NAND_CMD_STATUS:
657 info->use_dma = 0; /* force PIO read */
658 info->buf_start = 0;
659 info->buf_count = (command == NAND_CMD_READID) ?
660 info->read_id_bytes : 1;
661
662 if (prepare_other_cmd(info, (command == NAND_CMD_READID) ?
663 cmdset->read_id : cmdset->read_status))
664 break;
665
666 pxa3xx_nand_do_cmd(info, NDSR_RDDREQ);
667 break;
668 case NAND_CMD_RESET:
669 if (prepare_other_cmd(info, cmdset->reset))
670 break;
671
672 ret = pxa3xx_nand_do_cmd(info, NDSR_CS0_CMDD);
673 if (ret == 0) {
674 int timeout = 2;
675 uint32_t ndcr;
676
677 while (timeout--) {
678 if (nand_readl(info, NDSR) & NDSR_RDY)
679 break;
680 msleep(10);
681 }
682
683 ndcr = nand_readl(info, NDCR);
684 nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
685 }
686 break;
687 default:
688 printk(KERN_ERR "non-supported command.\n");
689 break;
690 }
691
692 if (info->retcode == ERR_DBERR) {
693 printk(KERN_ERR "double bit error @ page %08x\n", page_addr);
694 info->retcode = ERR_NONE;
695 }
696 }
697
698 static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd)
699 {
700 struct pxa3xx_nand_info *info = mtd->priv;
701 char retval = 0xFF;
702
703 if (info->buf_start < info->buf_count)
704 /* Has just send a new command? */
705 retval = info->data_buff[info->buf_start++];
706
707 return retval;
708 }
709
710 static u16 pxa3xx_nand_read_word(struct mtd_info *mtd)
711 {
712 struct pxa3xx_nand_info *info = mtd->priv;
713 u16 retval = 0xFFFF;
714
715 if (!(info->buf_start & 0x01) && info->buf_start < info->buf_count) {
716 retval = *((u16 *)(info->data_buff+info->buf_start));
717 info->buf_start += 2;
718 }
719 return retval;
720 }
721
722 static void pxa3xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
723 {
724 struct pxa3xx_nand_info *info = mtd->priv;
725 int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
726
727 memcpy(buf, info->data_buff + info->buf_start, real_len);
728 info->buf_start += real_len;
729 }
730
731 static void pxa3xx_nand_write_buf(struct mtd_info *mtd,
732 const uint8_t *buf, int len)
733 {
734 struct pxa3xx_nand_info *info = mtd->priv;
735 int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
736
737 memcpy(info->data_buff + info->buf_start, buf, real_len);
738 info->buf_start += real_len;
739 }
740
741 static int pxa3xx_nand_verify_buf(struct mtd_info *mtd,
742 const uint8_t *buf, int len)
743 {
744 return 0;
745 }
746
747 static void pxa3xx_nand_select_chip(struct mtd_info *mtd, int chip)
748 {
749 return;
750 }
751
752 static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
753 {
754 struct pxa3xx_nand_info *info = mtd->priv;
755
756 /* pxa3xx_nand_send_command has waited for command complete */
757 if (this->state == FL_WRITING || this->state == FL_ERASING) {
758 if (info->retcode == ERR_NONE)
759 return 0;
760 else {
761 /*
762 * any error make it return 0x01 which will tell
763 * the caller the erase and write fail
764 */
765 return 0x01;
766 }
767 }
768
769 return 0;
770 }
771
772 static void pxa3xx_nand_ecc_hwctl(struct mtd_info *mtd, int mode)
773 {
774 return;
775 }
776
777 static int pxa3xx_nand_ecc_calculate(struct mtd_info *mtd,
778 const uint8_t *dat, uint8_t *ecc_code)
779 {
780 return 0;
781 }
782
783 static int pxa3xx_nand_ecc_correct(struct mtd_info *mtd,
784 uint8_t *dat, uint8_t *read_ecc, uint8_t *calc_ecc)
785 {
786 struct pxa3xx_nand_info *info = mtd->priv;
787 /*
788 * Any error include ERR_SEND_CMD, ERR_DBERR, ERR_BUSERR, we
789 * consider it as a ecc error which will tell the caller the
790 * read fail We have distinguish all the errors, but the
791 * nand_read_ecc only check this function return value
792 *
793 * Corrected (single-bit) errors must also be noted.
794 */
795 if (info->retcode == ERR_SBERR)
796 return 1;
797 else if (info->retcode != ERR_NONE)
798 return -1;
799
800 return 0;
801 }
802
803 static int __readid(struct pxa3xx_nand_info *info, uint32_t *id)
804 {
805 const struct pxa3xx_nand_cmdset *cmdset = info->cmdset;
806 uint32_t ndcr;
807 uint8_t id_buff[8];
808
809 if (prepare_other_cmd(info, cmdset->read_id)) {
810 printk(KERN_ERR "failed to prepare command\n");
811 return -EINVAL;
812 }
813
814 /* Send command */
815 if (write_cmd(info))
816 goto fail_timeout;
817
818 /* Wait for CMDDM(command done successfully) */
819 if (wait_for_event(info, NDSR_RDDREQ))
820 goto fail_timeout;
821
822 __raw_readsl(info->mmio_base + NDDB, id_buff, 2);
823 *id = id_buff[0] | (id_buff[1] << 8);
824 return 0;
825
826 fail_timeout:
827 ndcr = nand_readl(info, NDCR);
828 nand_writel(info, NDCR, ndcr & ~NDCR_ND_RUN);
829 udelay(10);
830 return -ETIMEDOUT;
831 }
832
833 static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info,
834 const struct pxa3xx_nand_flash *f)
835 {
836 struct platform_device *pdev = info->pdev;
837 struct pxa3xx_nand_platform_data *pdata = pdev->dev.platform_data;
838 uint32_t ndcr = 0x00000FFF; /* disable all interrupts */
839
840 if (f->page_size != 2048 && f->page_size != 512)
841 return -EINVAL;
842
843 if (f->flash_width != 16 && f->flash_width != 8)
844 return -EINVAL;
845
846 /* calculate flash information */
847 info->cmdset = f->cmdset;
848 info->page_size = f->page_size;
849 info->oob_buff = info->data_buff + f->page_size;
850 info->read_id_bytes = (f->page_size == 2048) ? 4 : 2;
851
852 /* calculate addressing information */
853 info->col_addr_cycles = (f->page_size == 2048) ? 2 : 1;
854
855 if (f->num_blocks * f->page_per_block > 65536)
856 info->row_addr_cycles = 3;
857 else
858 info->row_addr_cycles = 2;
859
860 ndcr |= (pdata->enable_arbiter) ? NDCR_ND_ARB_EN : 0;
861 ndcr |= (info->col_addr_cycles == 2) ? NDCR_RA_START : 0;
862 ndcr |= (f->page_per_block == 64) ? NDCR_PG_PER_BLK : 0;
863 ndcr |= (f->page_size == 2048) ? NDCR_PAGE_SZ : 0;
864 ndcr |= (f->flash_width == 16) ? NDCR_DWIDTH_M : 0;
865 ndcr |= (f->dfc_width == 16) ? NDCR_DWIDTH_C : 0;
866
867 ndcr |= NDCR_RD_ID_CNT(info->read_id_bytes);
868 ndcr |= NDCR_SPARE_EN; /* enable spare by default */
869
870 info->reg_ndcr = ndcr;
871
872 pxa3xx_nand_set_timing(info, f->timing);
873 return 0;
874 }
875
876 static int pxa3xx_nand_detect_config(struct pxa3xx_nand_info *info)
877 {
878 uint32_t ndcr = nand_readl(info, NDCR);
879 struct nand_flash_dev *type = NULL;
880 uint32_t id = -1, page_per_block, num_blocks;
881 int i;
882
883 page_per_block = ndcr & NDCR_PG_PER_BLK ? 64 : 32;
884 info->page_size = ndcr & NDCR_PAGE_SZ ? 2048 : 512;
885 /* set info fields needed to __readid */
886 info->read_id_bytes = (info->page_size == 2048) ? 4 : 2;
887 info->reg_ndcr = ndcr;
888 info->cmdset = &default_cmdset;
889
890 if (__readid(info, &id))
891 return -ENODEV;
892
893 /* Lookup the flash id */
894 id = (id >> 8) & 0xff; /* device id is byte 2 */
895 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
896 if (id == nand_flash_ids[i].id) {
897 type = &nand_flash_ids[i];
898 break;
899 }
900 }
901
902 if (!type)
903 return -ENODEV;
904
905 /* fill the missing flash information */
906 i = __ffs(page_per_block * info->page_size);
907 num_blocks = type->chipsize << (20 - i);
908
909 /* calculate addressing information */
910 info->col_addr_cycles = (info->page_size == 2048) ? 2 : 1;
911
912 if (num_blocks * page_per_block > 65536)
913 info->row_addr_cycles = 3;
914 else
915 info->row_addr_cycles = 2;
916
917 info->ndtr0cs0 = nand_readl(info, NDTR0CS0);
918 info->ndtr1cs0 = nand_readl(info, NDTR1CS0);
919
920 return 0;
921 }
922
923 static int pxa3xx_nand_detect_flash(struct pxa3xx_nand_info *info,
924 const struct pxa3xx_nand_platform_data *pdata)
925 {
926 const struct pxa3xx_nand_flash *f;
927 uint32_t id = -1;
928 int i;
929
930 if (pdata->keep_config)
931 if (pxa3xx_nand_detect_config(info) == 0)
932 return 0;
933
934 /* we use default timing to detect id */
935 f = DEFAULT_FLASH_TYPE;
936 pxa3xx_nand_config_flash(info, f);
937 if (__readid(info, &id))
938 goto fail_detect;
939
940 for (i=0; i<ARRAY_SIZE(builtin_flash_types) + pdata->num_flash - 1; i++) {
941 /* we first choose the flash definition from platfrom */
942 if (i < pdata->num_flash)
943 f = pdata->flash + i;
944 else
945 f = &builtin_flash_types[i - pdata->num_flash + 1];
946 if (f->chip_id == id) {
947 dev_info(&info->pdev->dev, "detect chip id: 0x%x\n", id);
948 pxa3xx_nand_config_flash(info, f);
949 return 0;
950 }
951 }
952
953 dev_warn(&info->pdev->dev,
954 "failed to detect configured nand flash; found %04x instead of\n",
955 id);
956 fail_detect:
957 return -ENODEV;
958 }
959
960 /* the maximum possible buffer size for large page with OOB data
961 * is: 2048 + 64 = 2112 bytes, allocate a page here for both the
962 * data buffer and the DMA descriptor
963 */
964 #define MAX_BUFF_SIZE PAGE_SIZE
965
966 static int pxa3xx_nand_init_buff(struct pxa3xx_nand_info *info)
967 {
968 struct platform_device *pdev = info->pdev;
969 int data_desc_offset = MAX_BUFF_SIZE - sizeof(struct pxa_dma_desc);
970
971 if (use_dma == 0) {
972 info->data_buff = kmalloc(MAX_BUFF_SIZE, GFP_KERNEL);
973 if (info->data_buff == NULL)
974 return -ENOMEM;
975 return 0;
976 }
977
978 info->data_buff = dma_alloc_coherent(&pdev->dev, MAX_BUFF_SIZE,
979 &info->data_buff_phys, GFP_KERNEL);
980 if (info->data_buff == NULL) {
981 dev_err(&pdev->dev, "failed to allocate dma buffer\n");
982 return -ENOMEM;
983 }
984
985 info->data_buff_size = MAX_BUFF_SIZE;
986 info->data_desc = (void *)info->data_buff + data_desc_offset;
987 info->data_desc_addr = info->data_buff_phys + data_desc_offset;
988
989 info->data_dma_ch = pxa_request_dma("nand-data", DMA_PRIO_LOW,
990 pxa3xx_nand_data_dma_irq, info);
991 if (info->data_dma_ch < 0) {
992 dev_err(&pdev->dev, "failed to request data dma\n");
993 dma_free_coherent(&pdev->dev, info->data_buff_size,
994 info->data_buff, info->data_buff_phys);
995 return info->data_dma_ch;
996 }
997
998 return 0;
999 }
1000
1001 static struct nand_ecclayout hw_smallpage_ecclayout = {
1002 .eccbytes = 6,
1003 .eccpos = {8, 9, 10, 11, 12, 13 },
1004 .oobfree = { {2, 6} }
1005 };
1006
1007 static struct nand_ecclayout hw_largepage_ecclayout = {
1008 .eccbytes = 24,
1009 .eccpos = {
1010 40, 41, 42, 43, 44, 45, 46, 47,
1011 48, 49, 50, 51, 52, 53, 54, 55,
1012 56, 57, 58, 59, 60, 61, 62, 63},
1013 .oobfree = { {2, 38} }
1014 };
1015
1016 static void pxa3xx_nand_init_mtd(struct mtd_info *mtd,
1017 struct pxa3xx_nand_info *info)
1018 {
1019 struct nand_chip *this = &info->nand_chip;
1020
1021 this->options = (info->reg_ndcr & NDCR_DWIDTH_C) ? NAND_BUSWIDTH_16: 0;
1022
1023 this->waitfunc = pxa3xx_nand_waitfunc;
1024 this->select_chip = pxa3xx_nand_select_chip;
1025 this->dev_ready = pxa3xx_nand_dev_ready;
1026 this->cmdfunc = pxa3xx_nand_cmdfunc;
1027 this->read_word = pxa3xx_nand_read_word;
1028 this->read_byte = pxa3xx_nand_read_byte;
1029 this->read_buf = pxa3xx_nand_read_buf;
1030 this->write_buf = pxa3xx_nand_write_buf;
1031 this->verify_buf = pxa3xx_nand_verify_buf;
1032
1033 this->ecc.mode = NAND_ECC_HW;
1034 this->ecc.hwctl = pxa3xx_nand_ecc_hwctl;
1035 this->ecc.calculate = pxa3xx_nand_ecc_calculate;
1036 this->ecc.correct = pxa3xx_nand_ecc_correct;
1037 this->ecc.size = info->page_size;
1038
1039 if (info->page_size == 2048)
1040 this->ecc.layout = &hw_largepage_ecclayout;
1041 else
1042 this->ecc.layout = &hw_smallpage_ecclayout;
1043
1044 this->chip_delay = 25;
1045 }
1046
1047 static int pxa3xx_nand_probe(struct platform_device *pdev)
1048 {
1049 struct pxa3xx_nand_platform_data *pdata;
1050 struct pxa3xx_nand_info *info;
1051 struct nand_chip *this;
1052 struct mtd_info *mtd;
1053 struct resource *r;
1054 int ret = 0, irq;
1055
1056 pdata = pdev->dev.platform_data;
1057
1058 if (!pdata) {
1059 dev_err(&pdev->dev, "no platform data defined\n");
1060 return -ENODEV;
1061 }
1062
1063 mtd = kzalloc(sizeof(struct mtd_info) + sizeof(struct pxa3xx_nand_info),
1064 GFP_KERNEL);
1065 if (!mtd) {
1066 dev_err(&pdev->dev, "failed to allocate memory\n");
1067 return -ENOMEM;
1068 }
1069
1070 info = (struct pxa3xx_nand_info *)(&mtd[1]);
1071 info->pdev = pdev;
1072
1073 this = &info->nand_chip;
1074 mtd->priv = info;
1075 mtd->owner = THIS_MODULE;
1076
1077 info->clk = clk_get(&pdev->dev, NULL);
1078 if (IS_ERR(info->clk)) {
1079 dev_err(&pdev->dev, "failed to get nand clock\n");
1080 ret = PTR_ERR(info->clk);
1081 goto fail_free_mtd;
1082 }
1083 clk_enable(info->clk);
1084
1085 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1086 if (r == NULL) {
1087 dev_err(&pdev->dev, "no resource defined for data DMA\n");
1088 ret = -ENXIO;
1089 goto fail_put_clk;
1090 }
1091 info->drcmr_dat = r->start;
1092
1093 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1094 if (r == NULL) {
1095 dev_err(&pdev->dev, "no resource defined for command DMA\n");
1096 ret = -ENXIO;
1097 goto fail_put_clk;
1098 }
1099 info->drcmr_cmd = r->start;
1100
1101 irq = platform_get_irq(pdev, 0);
1102 if (irq < 0) {
1103 dev_err(&pdev->dev, "no IRQ resource defined\n");
1104 ret = -ENXIO;
1105 goto fail_put_clk;
1106 }
1107
1108 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1109 if (r == NULL) {
1110 dev_err(&pdev->dev, "no IO memory resource defined\n");
1111 ret = -ENODEV;
1112 goto fail_put_clk;
1113 }
1114
1115 r = request_mem_region(r->start, resource_size(r), pdev->name);
1116 if (r == NULL) {
1117 dev_err(&pdev->dev, "failed to request memory resource\n");
1118 ret = -EBUSY;
1119 goto fail_put_clk;
1120 }
1121
1122 info->mmio_base = ioremap(r->start, resource_size(r));
1123 if (info->mmio_base == NULL) {
1124 dev_err(&pdev->dev, "ioremap() failed\n");
1125 ret = -ENODEV;
1126 goto fail_free_res;
1127 }
1128 info->mmio_phys = r->start;
1129
1130 ret = pxa3xx_nand_init_buff(info);
1131 if (ret)
1132 goto fail_free_io;
1133
1134 /* initialize all interrupts to be disabled */
1135 disable_int(info, NDSR_MASK);
1136
1137 ret = request_irq(irq, pxa3xx_nand_irq, IRQF_DISABLED,
1138 pdev->name, info);
1139 if (ret < 0) {
1140 dev_err(&pdev->dev, "failed to request IRQ\n");
1141 goto fail_free_buf;
1142 }
1143
1144 ret = pxa3xx_nand_detect_flash(info, pdata);
1145 if (ret) {
1146 dev_err(&pdev->dev, "failed to detect flash\n");
1147 ret = -ENODEV;
1148 goto fail_free_irq;
1149 }
1150
1151 pxa3xx_nand_init_mtd(mtd, info);
1152
1153 platform_set_drvdata(pdev, mtd);
1154
1155 if (nand_scan(mtd, 1)) {
1156 dev_err(&pdev->dev, "failed to scan nand\n");
1157 ret = -ENXIO;
1158 goto fail_free_irq;
1159 }
1160
1161 #ifdef CONFIG_MTD_PARTITIONS
1162 if (mtd_has_cmdlinepart()) {
1163 static const char *probes[] = { "cmdlinepart", NULL };
1164 struct mtd_partition *parts;
1165 int nr_parts;
1166
1167 nr_parts = parse_mtd_partitions(mtd, probes, &parts, 0);
1168
1169 if (nr_parts)
1170 return add_mtd_partitions(mtd, parts, nr_parts);
1171 }
1172
1173 return add_mtd_partitions(mtd, pdata->parts, pdata->nr_parts);
1174 #else
1175 return 0;
1176 #endif
1177
1178 fail_free_irq:
1179 free_irq(irq, info);
1180 fail_free_buf:
1181 if (use_dma) {
1182 pxa_free_dma(info->data_dma_ch);
1183 dma_free_coherent(&pdev->dev, info->data_buff_size,
1184 info->data_buff, info->data_buff_phys);
1185 } else
1186 kfree(info->data_buff);
1187 fail_free_io:
1188 iounmap(info->mmio_base);
1189 fail_free_res:
1190 release_mem_region(r->start, resource_size(r));
1191 fail_put_clk:
1192 clk_disable(info->clk);
1193 clk_put(info->clk);
1194 fail_free_mtd:
1195 kfree(mtd);
1196 return ret;
1197 }
1198
1199 static int pxa3xx_nand_remove(struct platform_device *pdev)
1200 {
1201 struct mtd_info *mtd = platform_get_drvdata(pdev);
1202 struct pxa3xx_nand_info *info = mtd->priv;
1203 struct resource *r;
1204 int irq;
1205
1206 platform_set_drvdata(pdev, NULL);
1207
1208 del_mtd_device(mtd);
1209 #ifdef CONFIG_MTD_PARTITIONS
1210 del_mtd_partitions(mtd);
1211 #endif
1212 irq = platform_get_irq(pdev, 0);
1213 if (irq >= 0)
1214 free_irq(irq, info);
1215 if (use_dma) {
1216 pxa_free_dma(info->data_dma_ch);
1217 dma_free_writecombine(&pdev->dev, info->data_buff_size,
1218 info->data_buff, info->data_buff_phys);
1219 } else
1220 kfree(info->data_buff);
1221
1222 iounmap(info->mmio_base);
1223 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1224 release_mem_region(r->start, resource_size(r));
1225
1226 clk_disable(info->clk);
1227 clk_put(info->clk);
1228
1229 kfree(mtd);
1230 return 0;
1231 }
1232
1233 #ifdef CONFIG_PM
1234 static int pxa3xx_nand_suspend(struct platform_device *pdev, pm_message_t state)
1235 {
1236 struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
1237 struct pxa3xx_nand_info *info = mtd->priv;
1238
1239 if (info->state != STATE_READY) {
1240 dev_err(&pdev->dev, "driver busy, state = %d\n", info->state);
1241 return -EAGAIN;
1242 }
1243
1244 return 0;
1245 }
1246
1247 static int pxa3xx_nand_resume(struct platform_device *pdev)
1248 {
1249 struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
1250 struct pxa3xx_nand_info *info = mtd->priv;
1251
1252 nand_writel(info, NDTR0CS0, info->ndtr0cs0);
1253 nand_writel(info, NDTR1CS0, info->ndtr1cs0);
1254 clk_enable(info->clk);
1255
1256 return 0;
1257 }
1258 #else
1259 #define pxa3xx_nand_suspend NULL
1260 #define pxa3xx_nand_resume NULL
1261 #endif
1262
1263 static struct platform_driver pxa3xx_nand_driver = {
1264 .driver = {
1265 .name = "pxa3xx-nand",
1266 },
1267 .probe = pxa3xx_nand_probe,
1268 .remove = pxa3xx_nand_remove,
1269 .suspend = pxa3xx_nand_suspend,
1270 .resume = pxa3xx_nand_resume,
1271 };
1272
1273 static int __init pxa3xx_nand_init(void)
1274 {
1275 return platform_driver_register(&pxa3xx_nand_driver);
1276 }
1277 module_init(pxa3xx_nand_init);
1278
1279 static void __exit pxa3xx_nand_exit(void)
1280 {
1281 platform_driver_unregister(&pxa3xx_nand_driver);
1282 }
1283 module_exit(pxa3xx_nand_exit);
1284
1285 MODULE_LICENSE("GPL");
1286 MODULE_DESCRIPTION("PXA3xx NAND controller driver");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree