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1 | /* | |
2 | * linux/drivers/mtd/onenand/omap2.c | |
3 | * | |
4 | * OneNAND driver for OMAP2 / OMAP3 | |
5 | * | |
6 | * Copyright © 2005-2006 Nokia Corporation | |
7 | * | |
8 | * Author: Jarkko Lavinen <jarkko.lavinen@nokia.com> and Juha Yrjölä | |
9 | * IRQ and DMA support written by Timo Teras | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License version 2 as published by | |
13 | * the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
16 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
17 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
18 | * more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along with | |
21 | * this program; see the file COPYING. If not, write to the Free Software | |
22 | * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/device.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/mtd/mtd.h> | |
29 | #include <linux/mtd/onenand.h> | |
30 | #include <linux/mtd/partitions.h> | |
31 | #include <linux/platform_device.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/dma-mapping.h> | |
35 | #include <linux/io.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/regulator/consumer.h> | |
38 | ||
39 | #include <asm/mach/flash.h> | |
40 | #include <linux/platform_data/mtd-onenand-omap2.h> | |
41 | #include <asm/gpio.h> | |
42 | ||
43 | #include <linux/omap-dma.h> | |
44 | ||
45 | #define DRIVER_NAME "omap2-onenand" | |
46 | ||
47 | #define ONENAND_BUFRAM_SIZE (1024 * 5) | |
48 | ||
49 | struct omap2_onenand { | |
50 | struct platform_device *pdev; | |
51 | int gpmc_cs; | |
52 | unsigned long phys_base; | |
53 | unsigned int mem_size; | |
54 | int gpio_irq; | |
55 | struct mtd_info mtd; | |
56 | struct onenand_chip onenand; | |
57 | struct completion irq_done; | |
58 | struct completion dma_done; | |
59 | int dma_channel; | |
60 | int freq; | |
61 | int (*setup)(void __iomem *base, int *freq_ptr); | |
62 | struct regulator *regulator; | |
63 | u8 flags; | |
64 | }; | |
65 | ||
66 | static void omap2_onenand_dma_cb(int lch, u16 ch_status, void *data) | |
67 | { | |
68 | struct omap2_onenand *c = data; | |
69 | ||
70 | complete(&c->dma_done); | |
71 | } | |
72 | ||
73 | static irqreturn_t omap2_onenand_interrupt(int irq, void *dev_id) | |
74 | { | |
75 | struct omap2_onenand *c = dev_id; | |
76 | ||
77 | complete(&c->irq_done); | |
78 | ||
79 | return IRQ_HANDLED; | |
80 | } | |
81 | ||
82 | static inline unsigned short read_reg(struct omap2_onenand *c, int reg) | |
83 | { | |
84 | return readw(c->onenand.base + reg); | |
85 | } | |
86 | ||
87 | static inline void write_reg(struct omap2_onenand *c, unsigned short value, | |
88 | int reg) | |
89 | { | |
90 | writew(value, c->onenand.base + reg); | |
91 | } | |
92 | ||
93 | static void wait_err(char *msg, int state, unsigned int ctrl, unsigned int intr) | |
94 | { | |
95 | printk(KERN_ERR "onenand_wait: %s! state %d ctrl 0x%04x intr 0x%04x\n", | |
96 | msg, state, ctrl, intr); | |
97 | } | |
98 | ||
99 | static void wait_warn(char *msg, int state, unsigned int ctrl, | |
100 | unsigned int intr) | |
101 | { | |
102 | printk(KERN_WARNING "onenand_wait: %s! state %d ctrl 0x%04x " | |
103 | "intr 0x%04x\n", msg, state, ctrl, intr); | |
104 | } | |
105 | ||
106 | static int omap2_onenand_wait(struct mtd_info *mtd, int state) | |
107 | { | |
108 | struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd); | |
109 | struct onenand_chip *this = mtd->priv; | |
110 | unsigned int intr = 0; | |
111 | unsigned int ctrl, ctrl_mask; | |
112 | unsigned long timeout; | |
113 | u32 syscfg; | |
114 | ||
115 | if (state == FL_RESETING || state == FL_PREPARING_ERASE || | |
116 | state == FL_VERIFYING_ERASE) { | |
117 | int i = 21; | |
118 | unsigned int intr_flags = ONENAND_INT_MASTER; | |
119 | ||
120 | switch (state) { | |
121 | case FL_RESETING: | |
122 | intr_flags |= ONENAND_INT_RESET; | |
123 | break; | |
124 | case FL_PREPARING_ERASE: | |
125 | intr_flags |= ONENAND_INT_ERASE; | |
126 | break; | |
127 | case FL_VERIFYING_ERASE: | |
128 | i = 101; | |
129 | break; | |
130 | } | |
131 | ||
132 | while (--i) { | |
133 | udelay(1); | |
134 | intr = read_reg(c, ONENAND_REG_INTERRUPT); | |
135 | if (intr & ONENAND_INT_MASTER) | |
136 | break; | |
137 | } | |
138 | ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS); | |
139 | if (ctrl & ONENAND_CTRL_ERROR) { | |
140 | wait_err("controller error", state, ctrl, intr); | |
141 | return -EIO; | |
142 | } | |
143 | if ((intr & intr_flags) == intr_flags) | |
144 | return 0; | |
145 | /* Continue in wait for interrupt branch */ | |
146 | } | |
147 | ||
148 | if (state != FL_READING) { | |
149 | int result; | |
150 | ||
151 | /* Turn interrupts on */ | |
152 | syscfg = read_reg(c, ONENAND_REG_SYS_CFG1); | |
153 | if (!(syscfg & ONENAND_SYS_CFG1_IOBE)) { | |
154 | syscfg |= ONENAND_SYS_CFG1_IOBE; | |
155 | write_reg(c, syscfg, ONENAND_REG_SYS_CFG1); | |
156 | if (c->flags & ONENAND_IN_OMAP34XX) | |
157 | /* Add a delay to let GPIO settle */ | |
158 | syscfg = read_reg(c, ONENAND_REG_SYS_CFG1); | |
159 | } | |
160 | ||
161 | reinit_completion(&c->irq_done); | |
162 | if (c->gpio_irq) { | |
163 | result = gpio_get_value(c->gpio_irq); | |
164 | if (result == -1) { | |
165 | ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS); | |
166 | intr = read_reg(c, ONENAND_REG_INTERRUPT); | |
167 | wait_err("gpio error", state, ctrl, intr); | |
168 | return -EIO; | |
169 | } | |
170 | } else | |
171 | result = 0; | |
172 | if (result == 0) { | |
173 | int retry_cnt = 0; | |
174 | retry: | |
175 | result = wait_for_completion_timeout(&c->irq_done, | |
176 | msecs_to_jiffies(20)); | |
177 | if (result == 0) { | |
178 | /* Timeout after 20ms */ | |
179 | ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS); | |
180 | if (ctrl & ONENAND_CTRL_ONGO && | |
181 | !this->ongoing) { | |
182 | /* | |
183 | * The operation seems to be still going | |
184 | * so give it some more time. | |
185 | */ | |
186 | retry_cnt += 1; | |
187 | if (retry_cnt < 3) | |
188 | goto retry; | |
189 | intr = read_reg(c, | |
190 | ONENAND_REG_INTERRUPT); | |
191 | wait_err("timeout", state, ctrl, intr); | |
192 | return -EIO; | |
193 | } | |
194 | intr = read_reg(c, ONENAND_REG_INTERRUPT); | |
195 | if ((intr & ONENAND_INT_MASTER) == 0) | |
196 | wait_warn("timeout", state, ctrl, intr); | |
197 | } | |
198 | } | |
199 | } else { | |
200 | int retry_cnt = 0; | |
201 | ||
202 | /* Turn interrupts off */ | |
203 | syscfg = read_reg(c, ONENAND_REG_SYS_CFG1); | |
204 | syscfg &= ~ONENAND_SYS_CFG1_IOBE; | |
205 | write_reg(c, syscfg, ONENAND_REG_SYS_CFG1); | |
206 | ||
207 | timeout = jiffies + msecs_to_jiffies(20); | |
208 | while (1) { | |
209 | if (time_before(jiffies, timeout)) { | |
210 | intr = read_reg(c, ONENAND_REG_INTERRUPT); | |
211 | if (intr & ONENAND_INT_MASTER) | |
212 | break; | |
213 | } else { | |
214 | /* Timeout after 20ms */ | |
215 | ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS); | |
216 | if (ctrl & ONENAND_CTRL_ONGO) { | |
217 | /* | |
218 | * The operation seems to be still going | |
219 | * so give it some more time. | |
220 | */ | |
221 | retry_cnt += 1; | |
222 | if (retry_cnt < 3) { | |
223 | timeout = jiffies + | |
224 | msecs_to_jiffies(20); | |
225 | continue; | |
226 | } | |
227 | } | |
228 | break; | |
229 | } | |
230 | } | |
231 | } | |
232 | ||
233 | intr = read_reg(c, ONENAND_REG_INTERRUPT); | |
234 | ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS); | |
235 | ||
236 | if (intr & ONENAND_INT_READ) { | |
237 | int ecc = read_reg(c, ONENAND_REG_ECC_STATUS); | |
238 | ||
239 | if (ecc) { | |
240 | unsigned int addr1, addr8; | |
241 | ||
242 | addr1 = read_reg(c, ONENAND_REG_START_ADDRESS1); | |
243 | addr8 = read_reg(c, ONENAND_REG_START_ADDRESS8); | |
244 | if (ecc & ONENAND_ECC_2BIT_ALL) { | |
245 | printk(KERN_ERR "onenand_wait: ECC error = " | |
246 | "0x%04x, addr1 %#x, addr8 %#x\n", | |
247 | ecc, addr1, addr8); | |
248 | mtd->ecc_stats.failed++; | |
249 | return -EBADMSG; | |
250 | } else if (ecc & ONENAND_ECC_1BIT_ALL) { | |
251 | printk(KERN_NOTICE "onenand_wait: correctable " | |
252 | "ECC error = 0x%04x, addr1 %#x, " | |
253 | "addr8 %#x\n", ecc, addr1, addr8); | |
254 | mtd->ecc_stats.corrected++; | |
255 | } | |
256 | } | |
257 | } else if (state == FL_READING) { | |
258 | wait_err("timeout", state, ctrl, intr); | |
259 | return -EIO; | |
260 | } | |
261 | ||
262 | if (ctrl & ONENAND_CTRL_ERROR) { | |
263 | wait_err("controller error", state, ctrl, intr); | |
264 | if (ctrl & ONENAND_CTRL_LOCK) | |
265 | printk(KERN_ERR "onenand_wait: " | |
266 | "Device is write protected!!!\n"); | |
267 | return -EIO; | |
268 | } | |
269 | ||
270 | ctrl_mask = 0xFE9F; | |
271 | if (this->ongoing) | |
272 | ctrl_mask &= ~0x8000; | |
273 | ||
274 | if (ctrl & ctrl_mask) | |
275 | wait_warn("unexpected controller status", state, ctrl, intr); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static inline int omap2_onenand_bufferram_offset(struct mtd_info *mtd, int area) | |
281 | { | |
282 | struct onenand_chip *this = mtd->priv; | |
283 | ||
284 | if (ONENAND_CURRENT_BUFFERRAM(this)) { | |
285 | if (area == ONENAND_DATARAM) | |
286 | return this->writesize; | |
287 | if (area == ONENAND_SPARERAM) | |
288 | return mtd->oobsize; | |
289 | } | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
294 | #if defined(CONFIG_ARCH_OMAP3) || defined(MULTI_OMAP2) | |
295 | ||
296 | static int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area, | |
297 | unsigned char *buffer, int offset, | |
298 | size_t count) | |
299 | { | |
300 | struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd); | |
301 | struct onenand_chip *this = mtd->priv; | |
302 | dma_addr_t dma_src, dma_dst; | |
303 | int bram_offset; | |
304 | unsigned long timeout; | |
305 | void *buf = (void *)buffer; | |
306 | size_t xtra; | |
307 | volatile unsigned *done; | |
308 | ||
309 | bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset; | |
310 | if (bram_offset & 3 || (size_t)buf & 3 || count < 384) | |
311 | goto out_copy; | |
312 | ||
313 | /* panic_write() may be in an interrupt context */ | |
314 | if (in_interrupt() || oops_in_progress) | |
315 | goto out_copy; | |
316 | ||
317 | if (buf >= high_memory) { | |
318 | struct page *p1; | |
319 | ||
320 | if (((size_t)buf & PAGE_MASK) != | |
321 | ((size_t)(buf + count - 1) & PAGE_MASK)) | |
322 | goto out_copy; | |
323 | p1 = vmalloc_to_page(buf); | |
324 | if (!p1) | |
325 | goto out_copy; | |
326 | buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK); | |
327 | } | |
328 | ||
329 | xtra = count & 3; | |
330 | if (xtra) { | |
331 | count -= xtra; | |
332 | memcpy(buf + count, this->base + bram_offset + count, xtra); | |
333 | } | |
334 | ||
335 | dma_src = c->phys_base + bram_offset; | |
336 | dma_dst = dma_map_single(&c->pdev->dev, buf, count, DMA_FROM_DEVICE); | |
337 | if (dma_mapping_error(&c->pdev->dev, dma_dst)) { | |
338 | dev_err(&c->pdev->dev, | |
339 | "Couldn't DMA map a %d byte buffer\n", | |
340 | count); | |
341 | goto out_copy; | |
342 | } | |
343 | ||
344 | omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32, | |
345 | count >> 2, 1, 0, 0, 0); | |
346 | omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC, | |
347 | dma_src, 0, 0); | |
348 | omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC, | |
349 | dma_dst, 0, 0); | |
350 | ||
351 | reinit_completion(&c->dma_done); | |
352 | omap_start_dma(c->dma_channel); | |
353 | ||
354 | timeout = jiffies + msecs_to_jiffies(20); | |
355 | done = &c->dma_done.done; | |
356 | while (time_before(jiffies, timeout)) | |
357 | if (*done) | |
358 | break; | |
359 | ||
360 | dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE); | |
361 | ||
362 | if (!*done) { | |
363 | dev_err(&c->pdev->dev, "timeout waiting for DMA\n"); | |
364 | goto out_copy; | |
365 | } | |
366 | ||
367 | return 0; | |
368 | ||
369 | out_copy: | |
370 | memcpy(buf, this->base + bram_offset, count); | |
371 | return 0; | |
372 | } | |
373 | ||
374 | static int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area, | |
375 | const unsigned char *buffer, | |
376 | int offset, size_t count) | |
377 | { | |
378 | struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd); | |
379 | struct onenand_chip *this = mtd->priv; | |
380 | dma_addr_t dma_src, dma_dst; | |
381 | int bram_offset; | |
382 | unsigned long timeout; | |
383 | void *buf = (void *)buffer; | |
384 | volatile unsigned *done; | |
385 | ||
386 | bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset; | |
387 | if (bram_offset & 3 || (size_t)buf & 3 || count < 384) | |
388 | goto out_copy; | |
389 | ||
390 | /* panic_write() may be in an interrupt context */ | |
391 | if (in_interrupt() || oops_in_progress) | |
392 | goto out_copy; | |
393 | ||
394 | if (buf >= high_memory) { | |
395 | struct page *p1; | |
396 | ||
397 | if (((size_t)buf & PAGE_MASK) != | |
398 | ((size_t)(buf + count - 1) & PAGE_MASK)) | |
399 | goto out_copy; | |
400 | p1 = vmalloc_to_page(buf); | |
401 | if (!p1) | |
402 | goto out_copy; | |
403 | buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK); | |
404 | } | |
405 | ||
406 | dma_src = dma_map_single(&c->pdev->dev, buf, count, DMA_TO_DEVICE); | |
407 | dma_dst = c->phys_base + bram_offset; | |
408 | if (dma_mapping_error(&c->pdev->dev, dma_src)) { | |
409 | dev_err(&c->pdev->dev, | |
410 | "Couldn't DMA map a %d byte buffer\n", | |
411 | count); | |
412 | return -1; | |
413 | } | |
414 | ||
415 | omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32, | |
416 | count >> 2, 1, 0, 0, 0); | |
417 | omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC, | |
418 | dma_src, 0, 0); | |
419 | omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC, | |
420 | dma_dst, 0, 0); | |
421 | ||
422 | reinit_completion(&c->dma_done); | |
423 | omap_start_dma(c->dma_channel); | |
424 | ||
425 | timeout = jiffies + msecs_to_jiffies(20); | |
426 | done = &c->dma_done.done; | |
427 | while (time_before(jiffies, timeout)) | |
428 | if (*done) | |
429 | break; | |
430 | ||
431 | dma_unmap_single(&c->pdev->dev, dma_src, count, DMA_TO_DEVICE); | |
432 | ||
433 | if (!*done) { | |
434 | dev_err(&c->pdev->dev, "timeout waiting for DMA\n"); | |
435 | goto out_copy; | |
436 | } | |
437 | ||
438 | return 0; | |
439 | ||
440 | out_copy: | |
441 | memcpy(this->base + bram_offset, buf, count); | |
442 | return 0; | |
443 | } | |
444 | ||
445 | #else | |
446 | ||
447 | static int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area, | |
448 | unsigned char *buffer, int offset, | |
449 | size_t count) | |
450 | { | |
451 | return -ENOSYS; | |
452 | } | |
453 | ||
454 | static int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area, | |
455 | const unsigned char *buffer, | |
456 | int offset, size_t count) | |
457 | { | |
458 | return -ENOSYS; | |
459 | } | |
460 | ||
461 | #endif | |
462 | ||
463 | #if defined(CONFIG_ARCH_OMAP2) || defined(MULTI_OMAP2) | |
464 | ||
465 | static int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area, | |
466 | unsigned char *buffer, int offset, | |
467 | size_t count) | |
468 | { | |
469 | struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd); | |
470 | struct onenand_chip *this = mtd->priv; | |
471 | dma_addr_t dma_src, dma_dst; | |
472 | int bram_offset; | |
473 | ||
474 | bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset; | |
475 | /* DMA is not used. Revisit PM requirements before enabling it. */ | |
476 | if (1 || (c->dma_channel < 0) || | |
477 | ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) || | |
478 | (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) { | |
479 | memcpy(buffer, (__force void *)(this->base + bram_offset), | |
480 | count); | |
481 | return 0; | |
482 | } | |
483 | ||
484 | dma_src = c->phys_base + bram_offset; | |
485 | dma_dst = dma_map_single(&c->pdev->dev, buffer, count, | |
486 | DMA_FROM_DEVICE); | |
487 | if (dma_mapping_error(&c->pdev->dev, dma_dst)) { | |
488 | dev_err(&c->pdev->dev, | |
489 | "Couldn't DMA map a %d byte buffer\n", | |
490 | count); | |
491 | return -1; | |
492 | } | |
493 | ||
494 | omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32, | |
495 | count / 4, 1, 0, 0, 0); | |
496 | omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC, | |
497 | dma_src, 0, 0); | |
498 | omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC, | |
499 | dma_dst, 0, 0); | |
500 | ||
501 | reinit_completion(&c->dma_done); | |
502 | omap_start_dma(c->dma_channel); | |
503 | wait_for_completion(&c->dma_done); | |
504 | ||
505 | dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE); | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | static int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area, | |
511 | const unsigned char *buffer, | |
512 | int offset, size_t count) | |
513 | { | |
514 | struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd); | |
515 | struct onenand_chip *this = mtd->priv; | |
516 | dma_addr_t dma_src, dma_dst; | |
517 | int bram_offset; | |
518 | ||
519 | bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset; | |
520 | /* DMA is not used. Revisit PM requirements before enabling it. */ | |
521 | if (1 || (c->dma_channel < 0) || | |
522 | ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) || | |
523 | (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) { | |
524 | memcpy((__force void *)(this->base + bram_offset), buffer, | |
525 | count); | |
526 | return 0; | |
527 | } | |
528 | ||
529 | dma_src = dma_map_single(&c->pdev->dev, (void *) buffer, count, | |
530 | DMA_TO_DEVICE); | |
531 | dma_dst = c->phys_base + bram_offset; | |
532 | if (dma_mapping_error(&c->pdev->dev, dma_src)) { | |
533 | dev_err(&c->pdev->dev, | |
534 | "Couldn't DMA map a %d byte buffer\n", | |
535 | count); | |
536 | return -1; | |
537 | } | |
538 | ||
539 | omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S16, | |
540 | count / 2, 1, 0, 0, 0); | |
541 | omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC, | |
542 | dma_src, 0, 0); | |
543 | omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC, | |
544 | dma_dst, 0, 0); | |
545 | ||
546 | reinit_completion(&c->dma_done); | |
547 | omap_start_dma(c->dma_channel); | |
548 | wait_for_completion(&c->dma_done); | |
549 | ||
550 | dma_unmap_single(&c->pdev->dev, dma_src, count, DMA_TO_DEVICE); | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | #else | |
556 | ||
557 | static int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area, | |
558 | unsigned char *buffer, int offset, | |
559 | size_t count) | |
560 | { | |
561 | return -ENOSYS; | |
562 | } | |
563 | ||
564 | static int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area, | |
565 | const unsigned char *buffer, | |
566 | int offset, size_t count) | |
567 | { | |
568 | return -ENOSYS; | |
569 | } | |
570 | ||
571 | #endif | |
572 | ||
573 | static struct platform_driver omap2_onenand_driver; | |
574 | ||
575 | static void omap2_onenand_shutdown(struct platform_device *pdev) | |
576 | { | |
577 | struct omap2_onenand *c = dev_get_drvdata(&pdev->dev); | |
578 | ||
579 | /* With certain content in the buffer RAM, the OMAP boot ROM code | |
580 | * can recognize the flash chip incorrectly. Zero it out before | |
581 | * soft reset. | |
582 | */ | |
583 | memset((__force void *)c->onenand.base, 0, ONENAND_BUFRAM_SIZE); | |
584 | } | |
585 | ||
586 | static int omap2_onenand_enable(struct mtd_info *mtd) | |
587 | { | |
588 | int ret; | |
589 | struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd); | |
590 | ||
591 | ret = regulator_enable(c->regulator); | |
592 | if (ret != 0) | |
593 | dev_err(&c->pdev->dev, "can't enable regulator\n"); | |
594 | ||
595 | return ret; | |
596 | } | |
597 | ||
598 | static int omap2_onenand_disable(struct mtd_info *mtd) | |
599 | { | |
600 | int ret; | |
601 | struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd); | |
602 | ||
603 | ret = regulator_disable(c->regulator); | |
604 | if (ret != 0) | |
605 | dev_err(&c->pdev->dev, "can't disable regulator\n"); | |
606 | ||
607 | return ret; | |
608 | } | |
609 | ||
610 | static int omap2_onenand_probe(struct platform_device *pdev) | |
611 | { | |
612 | struct omap_onenand_platform_data *pdata; | |
613 | struct omap2_onenand *c; | |
614 | struct onenand_chip *this; | |
615 | int r; | |
616 | struct resource *res; | |
617 | struct mtd_part_parser_data ppdata = {}; | |
618 | ||
619 | pdata = dev_get_platdata(&pdev->dev); | |
620 | if (pdata == NULL) { | |
621 | dev_err(&pdev->dev, "platform data missing\n"); | |
622 | return -ENODEV; | |
623 | } | |
624 | ||
625 | c = kzalloc(sizeof(struct omap2_onenand), GFP_KERNEL); | |
626 | if (!c) | |
627 | return -ENOMEM; | |
628 | ||
629 | init_completion(&c->irq_done); | |
630 | init_completion(&c->dma_done); | |
631 | c->flags = pdata->flags; | |
632 | c->gpmc_cs = pdata->cs; | |
633 | c->gpio_irq = pdata->gpio_irq; | |
634 | c->dma_channel = pdata->dma_channel; | |
635 | if (c->dma_channel < 0) { | |
636 | /* if -1, don't use DMA */ | |
637 | c->gpio_irq = 0; | |
638 | } | |
639 | ||
640 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
641 | if (res == NULL) { | |
642 | r = -EINVAL; | |
643 | dev_err(&pdev->dev, "error getting memory resource\n"); | |
644 | goto err_kfree; | |
645 | } | |
646 | ||
647 | c->phys_base = res->start; | |
648 | c->mem_size = resource_size(res); | |
649 | ||
650 | if (request_mem_region(c->phys_base, c->mem_size, | |
651 | pdev->dev.driver->name) == NULL) { | |
652 | dev_err(&pdev->dev, "Cannot reserve memory region at 0x%08lx, size: 0x%x\n", | |
653 | c->phys_base, c->mem_size); | |
654 | r = -EBUSY; | |
655 | goto err_kfree; | |
656 | } | |
657 | c->onenand.base = ioremap(c->phys_base, c->mem_size); | |
658 | if (c->onenand.base == NULL) { | |
659 | r = -ENOMEM; | |
660 | goto err_release_mem_region; | |
661 | } | |
662 | ||
663 | if (pdata->onenand_setup != NULL) { | |
664 | r = pdata->onenand_setup(c->onenand.base, &c->freq); | |
665 | if (r < 0) { | |
666 | dev_err(&pdev->dev, "Onenand platform setup failed: " | |
667 | "%d\n", r); | |
668 | goto err_iounmap; | |
669 | } | |
670 | c->setup = pdata->onenand_setup; | |
671 | } | |
672 | ||
673 | if (c->gpio_irq) { | |
674 | if ((r = gpio_request(c->gpio_irq, "OneNAND irq")) < 0) { | |
675 | dev_err(&pdev->dev, "Failed to request GPIO%d for " | |
676 | "OneNAND\n", c->gpio_irq); | |
677 | goto err_iounmap; | |
678 | } | |
679 | gpio_direction_input(c->gpio_irq); | |
680 | ||
681 | if ((r = request_irq(gpio_to_irq(c->gpio_irq), | |
682 | omap2_onenand_interrupt, IRQF_TRIGGER_RISING, | |
683 | pdev->dev.driver->name, c)) < 0) | |
684 | goto err_release_gpio; | |
685 | } | |
686 | ||
687 | if (c->dma_channel >= 0) { | |
688 | r = omap_request_dma(0, pdev->dev.driver->name, | |
689 | omap2_onenand_dma_cb, (void *) c, | |
690 | &c->dma_channel); | |
691 | if (r == 0) { | |
692 | omap_set_dma_write_mode(c->dma_channel, | |
693 | OMAP_DMA_WRITE_NON_POSTED); | |
694 | omap_set_dma_src_data_pack(c->dma_channel, 1); | |
695 | omap_set_dma_src_burst_mode(c->dma_channel, | |
696 | OMAP_DMA_DATA_BURST_8); | |
697 | omap_set_dma_dest_data_pack(c->dma_channel, 1); | |
698 | omap_set_dma_dest_burst_mode(c->dma_channel, | |
699 | OMAP_DMA_DATA_BURST_8); | |
700 | } else { | |
701 | dev_info(&pdev->dev, | |
702 | "failed to allocate DMA for OneNAND, " | |
703 | "using PIO instead\n"); | |
704 | c->dma_channel = -1; | |
705 | } | |
706 | } | |
707 | ||
708 | dev_info(&pdev->dev, "initializing on CS%d, phys base 0x%08lx, virtual " | |
709 | "base %p, freq %d MHz\n", c->gpmc_cs, c->phys_base, | |
710 | c->onenand.base, c->freq); | |
711 | ||
712 | c->pdev = pdev; | |
713 | c->mtd.name = dev_name(&pdev->dev); | |
714 | c->mtd.priv = &c->onenand; | |
715 | c->mtd.owner = THIS_MODULE; | |
716 | ||
717 | c->mtd.dev.parent = &pdev->dev; | |
718 | ||
719 | this = &c->onenand; | |
720 | if (c->dma_channel >= 0) { | |
721 | this->wait = omap2_onenand_wait; | |
722 | if (c->flags & ONENAND_IN_OMAP34XX) { | |
723 | this->read_bufferram = omap3_onenand_read_bufferram; | |
724 | this->write_bufferram = omap3_onenand_write_bufferram; | |
725 | } else { | |
726 | this->read_bufferram = omap2_onenand_read_bufferram; | |
727 | this->write_bufferram = omap2_onenand_write_bufferram; | |
728 | } | |
729 | } | |
730 | ||
731 | if (pdata->regulator_can_sleep) { | |
732 | c->regulator = regulator_get(&pdev->dev, "vonenand"); | |
733 | if (IS_ERR(c->regulator)) { | |
734 | dev_err(&pdev->dev, "Failed to get regulator\n"); | |
735 | r = PTR_ERR(c->regulator); | |
736 | goto err_release_dma; | |
737 | } | |
738 | c->onenand.enable = omap2_onenand_enable; | |
739 | c->onenand.disable = omap2_onenand_disable; | |
740 | } | |
741 | ||
742 | if (pdata->skip_initial_unlocking) | |
743 | this->options |= ONENAND_SKIP_INITIAL_UNLOCKING; | |
744 | ||
745 | if ((r = onenand_scan(&c->mtd, 1)) < 0) | |
746 | goto err_release_regulator; | |
747 | ||
748 | ppdata.of_node = pdata->of_node; | |
749 | r = mtd_device_parse_register(&c->mtd, NULL, &ppdata, | |
750 | pdata ? pdata->parts : NULL, | |
751 | pdata ? pdata->nr_parts : 0); | |
752 | if (r) | |
753 | goto err_release_onenand; | |
754 | ||
755 | platform_set_drvdata(pdev, c); | |
756 | ||
757 | return 0; | |
758 | ||
759 | err_release_onenand: | |
760 | onenand_release(&c->mtd); | |
761 | err_release_regulator: | |
762 | regulator_put(c->regulator); | |
763 | err_release_dma: | |
764 | if (c->dma_channel != -1) | |
765 | omap_free_dma(c->dma_channel); | |
766 | if (c->gpio_irq) | |
767 | free_irq(gpio_to_irq(c->gpio_irq), c); | |
768 | err_release_gpio: | |
769 | if (c->gpio_irq) | |
770 | gpio_free(c->gpio_irq); | |
771 | err_iounmap: | |
772 | iounmap(c->onenand.base); | |
773 | err_release_mem_region: | |
774 | release_mem_region(c->phys_base, c->mem_size); | |
775 | err_kfree: | |
776 | kfree(c); | |
777 | ||
778 | return r; | |
779 | } | |
780 | ||
781 | static int omap2_onenand_remove(struct platform_device *pdev) | |
782 | { | |
783 | struct omap2_onenand *c = dev_get_drvdata(&pdev->dev); | |
784 | ||
785 | onenand_release(&c->mtd); | |
786 | regulator_put(c->regulator); | |
787 | if (c->dma_channel != -1) | |
788 | omap_free_dma(c->dma_channel); | |
789 | omap2_onenand_shutdown(pdev); | |
790 | if (c->gpio_irq) { | |
791 | free_irq(gpio_to_irq(c->gpio_irq), c); | |
792 | gpio_free(c->gpio_irq); | |
793 | } | |
794 | iounmap(c->onenand.base); | |
795 | release_mem_region(c->phys_base, c->mem_size); | |
796 | kfree(c); | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
801 | static struct platform_driver omap2_onenand_driver = { | |
802 | .probe = omap2_onenand_probe, | |
803 | .remove = omap2_onenand_remove, | |
804 | .shutdown = omap2_onenand_shutdown, | |
805 | .driver = { | |
806 | .name = DRIVER_NAME, | |
807 | }, | |
808 | }; | |
809 | ||
810 | module_platform_driver(omap2_onenand_driver); | |
811 | ||
812 | MODULE_ALIAS("platform:" DRIVER_NAME); | |
813 | MODULE_LICENSE("GPL"); | |
814 | MODULE_AUTHOR("Jarkko Lavinen <jarkko.lavinen@nokia.com>"); | |
815 | MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP2 / OMAP3"); |