Commit | Line | Data |
---|---|---|
ba01d6ec LPC |
1 | /* |
2 | * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> | |
3 | * JZ4740 SoC NAND controller driver | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the | |
7 | * Free Software Foundation; either version 2 of the License, or (at your | |
8 | * option) any later version. | |
9 | * | |
10 | * You should have received a copy of the GNU General Public License along | |
11 | * with this program; if not, write to the Free Software Foundation, Inc., | |
12 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/ioport.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/slab.h> | |
21 | ||
22 | #include <linux/mtd/mtd.h> | |
23 | #include <linux/mtd/nand.h> | |
24 | #include <linux/mtd/partitions.h> | |
25 | ||
26 | #include <linux/gpio.h> | |
27 | ||
96dd922c | 28 | #include <asm/mach-jz4740/gpio.h> |
ba01d6ec LPC |
29 | #include <asm/mach-jz4740/jz4740_nand.h> |
30 | ||
31 | #define JZ_REG_NAND_CTRL 0x50 | |
32 | #define JZ_REG_NAND_ECC_CTRL 0x100 | |
33 | #define JZ_REG_NAND_DATA 0x104 | |
34 | #define JZ_REG_NAND_PAR0 0x108 | |
35 | #define JZ_REG_NAND_PAR1 0x10C | |
36 | #define JZ_REG_NAND_PAR2 0x110 | |
37 | #define JZ_REG_NAND_IRQ_STAT 0x114 | |
38 | #define JZ_REG_NAND_IRQ_CTRL 0x118 | |
39 | #define JZ_REG_NAND_ERR(x) (0x11C + ((x) << 2)) | |
40 | ||
41 | #define JZ_NAND_ECC_CTRL_PAR_READY BIT(4) | |
42 | #define JZ_NAND_ECC_CTRL_ENCODING BIT(3) | |
43 | #define JZ_NAND_ECC_CTRL_RS BIT(2) | |
44 | #define JZ_NAND_ECC_CTRL_RESET BIT(1) | |
45 | #define JZ_NAND_ECC_CTRL_ENABLE BIT(0) | |
46 | ||
47 | #define JZ_NAND_STATUS_ERR_COUNT (BIT(31) | BIT(30) | BIT(29)) | |
48 | #define JZ_NAND_STATUS_PAD_FINISH BIT(4) | |
49 | #define JZ_NAND_STATUS_DEC_FINISH BIT(3) | |
50 | #define JZ_NAND_STATUS_ENC_FINISH BIT(2) | |
51 | #define JZ_NAND_STATUS_UNCOR_ERROR BIT(1) | |
52 | #define JZ_NAND_STATUS_ERROR BIT(0) | |
53 | ||
54 | #define JZ_NAND_CTRL_ENABLE_CHIP(x) BIT((x) << 1) | |
55 | #define JZ_NAND_CTRL_ASSERT_CHIP(x) BIT(((x) << 1) + 1) | |
1471d41a | 56 | #define JZ_NAND_CTRL_ASSERT_CHIP_MASK 0xaa |
ba01d6ec | 57 | |
ba01d6ec | 58 | #define JZ_NAND_MEM_CMD_OFFSET 0x08000 |
1471d41a | 59 | #define JZ_NAND_MEM_ADDR_OFFSET 0x10000 |
ba01d6ec LPC |
60 | |
61 | struct jz_nand { | |
ba01d6ec LPC |
62 | struct nand_chip chip; |
63 | void __iomem *base; | |
64 | struct resource *mem; | |
65 | ||
1471d41a MH |
66 | unsigned char banks[JZ_NAND_NUM_BANKS]; |
67 | void __iomem *bank_base[JZ_NAND_NUM_BANKS]; | |
68 | struct resource *bank_mem[JZ_NAND_NUM_BANKS]; | |
69 | ||
70 | int selected_bank; | |
ba01d6ec | 71 | |
cd145af9 | 72 | struct gpio_desc *busy_gpio; |
ba01d6ec LPC |
73 | bool is_reading; |
74 | }; | |
75 | ||
76 | static inline struct jz_nand *mtd_to_jz_nand(struct mtd_info *mtd) | |
77 | { | |
d25cc7ab | 78 | return container_of(mtd_to_nand(mtd), struct jz_nand, chip); |
ba01d6ec LPC |
79 | } |
80 | ||
1471d41a MH |
81 | static void jz_nand_select_chip(struct mtd_info *mtd, int chipnr) |
82 | { | |
83 | struct jz_nand *nand = mtd_to_jz_nand(mtd); | |
4bd4ebcc | 84 | struct nand_chip *chip = mtd_to_nand(mtd); |
1471d41a MH |
85 | uint32_t ctrl; |
86 | int banknr; | |
87 | ||
88 | ctrl = readl(nand->base + JZ_REG_NAND_CTRL); | |
89 | ctrl &= ~JZ_NAND_CTRL_ASSERT_CHIP_MASK; | |
90 | ||
91 | if (chipnr == -1) { | |
92 | banknr = -1; | |
93 | } else { | |
94 | banknr = nand->banks[chipnr] - 1; | |
95 | chip->IO_ADDR_R = nand->bank_base[banknr]; | |
96 | chip->IO_ADDR_W = nand->bank_base[banknr]; | |
97 | } | |
98 | writel(ctrl, nand->base + JZ_REG_NAND_CTRL); | |
99 | ||
100 | nand->selected_bank = banknr; | |
101 | } | |
102 | ||
ba01d6ec LPC |
103 | static void jz_nand_cmd_ctrl(struct mtd_info *mtd, int dat, unsigned int ctrl) |
104 | { | |
105 | struct jz_nand *nand = mtd_to_jz_nand(mtd); | |
4bd4ebcc | 106 | struct nand_chip *chip = mtd_to_nand(mtd); |
ba01d6ec | 107 | uint32_t reg; |
1471d41a MH |
108 | void __iomem *bank_base = nand->bank_base[nand->selected_bank]; |
109 | ||
110 | BUG_ON(nand->selected_bank < 0); | |
ba01d6ec LPC |
111 | |
112 | if (ctrl & NAND_CTRL_CHANGE) { | |
113 | BUG_ON((ctrl & NAND_ALE) && (ctrl & NAND_CLE)); | |
114 | if (ctrl & NAND_ALE) | |
1471d41a | 115 | bank_base += JZ_NAND_MEM_ADDR_OFFSET; |
ba01d6ec | 116 | else if (ctrl & NAND_CLE) |
1471d41a MH |
117 | bank_base += JZ_NAND_MEM_CMD_OFFSET; |
118 | chip->IO_ADDR_W = bank_base; | |
ba01d6ec LPC |
119 | |
120 | reg = readl(nand->base + JZ_REG_NAND_CTRL); | |
121 | if (ctrl & NAND_NCE) | |
1471d41a | 122 | reg |= JZ_NAND_CTRL_ASSERT_CHIP(nand->selected_bank); |
ba01d6ec | 123 | else |
1471d41a | 124 | reg &= ~JZ_NAND_CTRL_ASSERT_CHIP(nand->selected_bank); |
ba01d6ec LPC |
125 | writel(reg, nand->base + JZ_REG_NAND_CTRL); |
126 | } | |
127 | if (dat != NAND_CMD_NONE) | |
128 | writeb(dat, chip->IO_ADDR_W); | |
129 | } | |
130 | ||
131 | static int jz_nand_dev_ready(struct mtd_info *mtd) | |
132 | { | |
133 | struct jz_nand *nand = mtd_to_jz_nand(mtd); | |
cd145af9 | 134 | return gpiod_get_value_cansleep(nand->busy_gpio); |
ba01d6ec LPC |
135 | } |
136 | ||
137 | static void jz_nand_hwctl(struct mtd_info *mtd, int mode) | |
138 | { | |
139 | struct jz_nand *nand = mtd_to_jz_nand(mtd); | |
140 | uint32_t reg; | |
141 | ||
142 | writel(0, nand->base + JZ_REG_NAND_IRQ_STAT); | |
143 | reg = readl(nand->base + JZ_REG_NAND_ECC_CTRL); | |
144 | ||
145 | reg |= JZ_NAND_ECC_CTRL_RESET; | |
146 | reg |= JZ_NAND_ECC_CTRL_ENABLE; | |
147 | reg |= JZ_NAND_ECC_CTRL_RS; | |
148 | ||
149 | switch (mode) { | |
150 | case NAND_ECC_READ: | |
151 | reg &= ~JZ_NAND_ECC_CTRL_ENCODING; | |
152 | nand->is_reading = true; | |
153 | break; | |
154 | case NAND_ECC_WRITE: | |
155 | reg |= JZ_NAND_ECC_CTRL_ENCODING; | |
156 | nand->is_reading = false; | |
157 | break; | |
158 | default: | |
159 | break; | |
160 | } | |
161 | ||
162 | writel(reg, nand->base + JZ_REG_NAND_ECC_CTRL); | |
163 | } | |
164 | ||
165 | static int jz_nand_calculate_ecc_rs(struct mtd_info *mtd, const uint8_t *dat, | |
166 | uint8_t *ecc_code) | |
167 | { | |
168 | struct jz_nand *nand = mtd_to_jz_nand(mtd); | |
169 | uint32_t reg, status; | |
170 | int i; | |
171 | unsigned int timeout = 1000; | |
172 | static uint8_t empty_block_ecc[] = {0xcd, 0x9d, 0x90, 0x58, 0xf4, | |
173 | 0x8b, 0xff, 0xb7, 0x6f}; | |
174 | ||
175 | if (nand->is_reading) | |
176 | return 0; | |
177 | ||
178 | do { | |
179 | status = readl(nand->base + JZ_REG_NAND_IRQ_STAT); | |
180 | } while (!(status & JZ_NAND_STATUS_ENC_FINISH) && --timeout); | |
181 | ||
182 | if (timeout == 0) | |
183 | return -1; | |
184 | ||
185 | reg = readl(nand->base + JZ_REG_NAND_ECC_CTRL); | |
186 | reg &= ~JZ_NAND_ECC_CTRL_ENABLE; | |
187 | writel(reg, nand->base + JZ_REG_NAND_ECC_CTRL); | |
188 | ||
189 | for (i = 0; i < 9; ++i) | |
190 | ecc_code[i] = readb(nand->base + JZ_REG_NAND_PAR0 + i); | |
191 | ||
192 | /* If the written data is completly 0xff, we also want to write 0xff as | |
193 | * ecc, otherwise we will get in trouble when doing subpage writes. */ | |
194 | if (memcmp(ecc_code, empty_block_ecc, 9) == 0) | |
195 | memset(ecc_code, 0xff, 9); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static void jz_nand_correct_data(uint8_t *dat, int index, int mask) | |
201 | { | |
202 | int offset = index & 0x7; | |
203 | uint16_t data; | |
204 | ||
205 | index += (index >> 3); | |
206 | ||
207 | data = dat[index]; | |
208 | data |= dat[index+1] << 8; | |
209 | ||
210 | mask ^= (data >> offset) & 0x1ff; | |
211 | data &= ~(0x1ff << offset); | |
212 | data |= (mask << offset); | |
213 | ||
214 | dat[index] = data & 0xff; | |
215 | dat[index+1] = (data >> 8) & 0xff; | |
216 | } | |
217 | ||
218 | static int jz_nand_correct_ecc_rs(struct mtd_info *mtd, uint8_t *dat, | |
219 | uint8_t *read_ecc, uint8_t *calc_ecc) | |
220 | { | |
221 | struct jz_nand *nand = mtd_to_jz_nand(mtd); | |
222 | int i, error_count, index; | |
223 | uint32_t reg, status, error; | |
ba01d6ec LPC |
224 | unsigned int timeout = 1000; |
225 | ||
ba01d6ec LPC |
226 | for (i = 0; i < 9; ++i) |
227 | writeb(read_ecc[i], nand->base + JZ_REG_NAND_PAR0 + i); | |
228 | ||
229 | reg = readl(nand->base + JZ_REG_NAND_ECC_CTRL); | |
230 | reg |= JZ_NAND_ECC_CTRL_PAR_READY; | |
231 | writel(reg, nand->base + JZ_REG_NAND_ECC_CTRL); | |
232 | ||
233 | do { | |
234 | status = readl(nand->base + JZ_REG_NAND_IRQ_STAT); | |
235 | } while (!(status & JZ_NAND_STATUS_DEC_FINISH) && --timeout); | |
236 | ||
237 | if (timeout == 0) | |
6e941192 | 238 | return -ETIMEDOUT; |
ba01d6ec LPC |
239 | |
240 | reg = readl(nand->base + JZ_REG_NAND_ECC_CTRL); | |
241 | reg &= ~JZ_NAND_ECC_CTRL_ENABLE; | |
242 | writel(reg, nand->base + JZ_REG_NAND_ECC_CTRL); | |
243 | ||
244 | if (status & JZ_NAND_STATUS_ERROR) { | |
245 | if (status & JZ_NAND_STATUS_UNCOR_ERROR) | |
6e941192 | 246 | return -EBADMSG; |
ba01d6ec LPC |
247 | |
248 | error_count = (status & JZ_NAND_STATUS_ERR_COUNT) >> 29; | |
249 | ||
250 | for (i = 0; i < error_count; ++i) { | |
251 | error = readl(nand->base + JZ_REG_NAND_ERR(i)); | |
252 | index = ((error >> 16) & 0x1ff) - 1; | |
253 | if (index >= 0 && index < 512) | |
254 | jz_nand_correct_data(dat, index, error & 0x1ff); | |
255 | } | |
256 | ||
257 | return error_count; | |
258 | } | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
ba01d6ec | 263 | static int jz_nand_ioremap_resource(struct platform_device *pdev, |
1471d41a | 264 | const char *name, struct resource **res, void *__iomem *base) |
ba01d6ec LPC |
265 | { |
266 | int ret; | |
267 | ||
268 | *res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name); | |
269 | if (!*res) { | |
270 | dev_err(&pdev->dev, "Failed to get platform %s memory\n", name); | |
271 | ret = -ENXIO; | |
272 | goto err; | |
273 | } | |
274 | ||
275 | *res = request_mem_region((*res)->start, resource_size(*res), | |
276 | pdev->name); | |
277 | if (!*res) { | |
278 | dev_err(&pdev->dev, "Failed to request %s memory region\n", name); | |
279 | ret = -EBUSY; | |
280 | goto err; | |
281 | } | |
282 | ||
283 | *base = ioremap((*res)->start, resource_size(*res)); | |
284 | if (!*base) { | |
285 | dev_err(&pdev->dev, "Failed to ioremap %s memory region\n", name); | |
286 | ret = -EBUSY; | |
287 | goto err_release_mem; | |
288 | } | |
289 | ||
290 | return 0; | |
291 | ||
292 | err_release_mem: | |
293 | release_mem_region((*res)->start, resource_size(*res)); | |
294 | err: | |
295 | *res = NULL; | |
296 | *base = NULL; | |
297 | return ret; | |
298 | } | |
299 | ||
7bf350b7 AB |
300 | static inline void jz_nand_iounmap_resource(struct resource *res, |
301 | void __iomem *base) | |
1471d41a MH |
302 | { |
303 | iounmap(base); | |
304 | release_mem_region(res->start, resource_size(res)); | |
305 | } | |
306 | ||
7bf350b7 AB |
307 | static int jz_nand_detect_bank(struct platform_device *pdev, |
308 | struct jz_nand *nand, unsigned char bank, | |
309 | size_t chipnr, uint8_t *nand_maf_id, | |
d8929942 GKH |
310 | uint8_t *nand_dev_id) |
311 | { | |
1471d41a MH |
312 | int ret; |
313 | int gpio; | |
314 | char gpio_name[9]; | |
315 | char res_name[6]; | |
316 | uint32_t ctrl; | |
1471d41a | 317 | struct nand_chip *chip = &nand->chip; |
d25cc7ab | 318 | struct mtd_info *mtd = nand_to_mtd(chip); |
1471d41a MH |
319 | |
320 | /* Request GPIO port. */ | |
321 | gpio = JZ_GPIO_MEM_CS0 + bank - 1; | |
322 | sprintf(gpio_name, "NAND CS%d", bank); | |
323 | ret = gpio_request(gpio, gpio_name); | |
324 | if (ret) { | |
325 | dev_warn(&pdev->dev, | |
326 | "Failed to request %s gpio %d: %d\n", | |
327 | gpio_name, gpio, ret); | |
328 | goto notfound_gpio; | |
329 | } | |
330 | ||
331 | /* Request I/O resource. */ | |
332 | sprintf(res_name, "bank%d", bank); | |
333 | ret = jz_nand_ioremap_resource(pdev, res_name, | |
334 | &nand->bank_mem[bank - 1], | |
335 | &nand->bank_base[bank - 1]); | |
336 | if (ret) | |
337 | goto notfound_resource; | |
338 | ||
339 | /* Enable chip in bank. */ | |
340 | jz_gpio_set_function(gpio, JZ_GPIO_FUNC_MEM_CS0); | |
341 | ctrl = readl(nand->base + JZ_REG_NAND_CTRL); | |
342 | ctrl |= JZ_NAND_CTRL_ENABLE_CHIP(bank - 1); | |
343 | writel(ctrl, nand->base + JZ_REG_NAND_CTRL); | |
344 | ||
345 | if (chipnr == 0) { | |
346 | /* Detect first chip. */ | |
347 | ret = nand_scan_ident(mtd, 1, NULL); | |
348 | if (ret) | |
349 | goto notfound_id; | |
350 | ||
351 | /* Retrieve the IDs from the first chip. */ | |
352 | chip->select_chip(mtd, 0); | |
353 | chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); | |
354 | chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1); | |
355 | *nand_maf_id = chip->read_byte(mtd); | |
356 | *nand_dev_id = chip->read_byte(mtd); | |
357 | } else { | |
358 | /* Detect additional chip. */ | |
359 | chip->select_chip(mtd, chipnr); | |
360 | chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); | |
361 | chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1); | |
362 | if (*nand_maf_id != chip->read_byte(mtd) | |
363 | || *nand_dev_id != chip->read_byte(mtd)) { | |
364 | ret = -ENODEV; | |
365 | goto notfound_id; | |
366 | } | |
367 | ||
368 | /* Update size of the MTD. */ | |
369 | chip->numchips++; | |
370 | mtd->size += chip->chipsize; | |
371 | } | |
372 | ||
373 | dev_info(&pdev->dev, "Found chip %i on bank %i\n", chipnr, bank); | |
374 | return 0; | |
375 | ||
376 | notfound_id: | |
377 | dev_info(&pdev->dev, "No chip found on bank %i\n", bank); | |
378 | ctrl &= ~(JZ_NAND_CTRL_ENABLE_CHIP(bank - 1)); | |
379 | writel(ctrl, nand->base + JZ_REG_NAND_CTRL); | |
380 | jz_gpio_set_function(gpio, JZ_GPIO_FUNC_NONE); | |
381 | jz_nand_iounmap_resource(nand->bank_mem[bank - 1], | |
382 | nand->bank_base[bank - 1]); | |
383 | notfound_resource: | |
384 | gpio_free(gpio); | |
385 | notfound_gpio: | |
386 | return ret; | |
387 | } | |
388 | ||
06f25510 | 389 | static int jz_nand_probe(struct platform_device *pdev) |
ba01d6ec LPC |
390 | { |
391 | int ret; | |
392 | struct jz_nand *nand; | |
393 | struct nand_chip *chip; | |
394 | struct mtd_info *mtd; | |
453810b7 | 395 | struct jz_nand_platform_data *pdata = dev_get_platdata(&pdev->dev); |
1471d41a MH |
396 | size_t chipnr, bank_idx; |
397 | uint8_t nand_maf_id = 0, nand_dev_id = 0; | |
ba01d6ec LPC |
398 | |
399 | nand = kzalloc(sizeof(*nand), GFP_KERNEL); | |
51b37b8a | 400 | if (!nand) |
ba01d6ec | 401 | return -ENOMEM; |
ba01d6ec LPC |
402 | |
403 | ret = jz_nand_ioremap_resource(pdev, "mmio", &nand->mem, &nand->base); | |
404 | if (ret) | |
405 | goto err_free; | |
ba01d6ec | 406 | |
cd145af9 LPC |
407 | nand->busy_gpio = devm_gpiod_get_optional(&pdev->dev, "busy", GPIOD_IN); |
408 | if (IS_ERR(nand->busy_gpio)) { | |
409 | ret = PTR_ERR(nand->busy_gpio); | |
410 | dev_err(&pdev->dev, "Failed to request busy gpio %d\n", | |
411 | ret); | |
412 | goto err_iounmap_mmio; | |
ba01d6ec LPC |
413 | } |
414 | ||
ba01d6ec | 415 | chip = &nand->chip; |
d25cc7ab | 416 | mtd = nand_to_mtd(chip); |
249eab69 | 417 | mtd->dev.parent = &pdev->dev; |
ba01d6ec LPC |
418 | mtd->name = "jz4740-nand"; |
419 | ||
420 | chip->ecc.hwctl = jz_nand_hwctl; | |
421 | chip->ecc.calculate = jz_nand_calculate_ecc_rs; | |
422 | chip->ecc.correct = jz_nand_correct_ecc_rs; | |
423 | chip->ecc.mode = NAND_ECC_HW_OOB_FIRST; | |
424 | chip->ecc.size = 512; | |
425 | chip->ecc.bytes = 9; | |
44df4d11 | 426 | chip->ecc.strength = 4; |
48bf35de | 427 | chip->ecc.options = NAND_ECC_GENERIC_ERASED_CHECK; |
ba01d6ec | 428 | |
ba01d6ec LPC |
429 | chip->chip_delay = 50; |
430 | chip->cmd_ctrl = jz_nand_cmd_ctrl; | |
1471d41a | 431 | chip->select_chip = jz_nand_select_chip; |
ba01d6ec | 432 | |
cd145af9 | 433 | if (nand->busy_gpio) |
ba01d6ec LPC |
434 | chip->dev_ready = jz_nand_dev_ready; |
435 | ||
ba01d6ec LPC |
436 | platform_set_drvdata(pdev, nand); |
437 | ||
1471d41a MH |
438 | /* We are going to autodetect NAND chips in the banks specified in the |
439 | * platform data. Although nand_scan_ident() can detect multiple chips, | |
440 | * it requires those chips to be numbered consecuitively, which is not | |
441 | * always the case for external memory banks. And a fixed chip-to-bank | |
442 | * mapping is not practical either, since for example Dingoo units | |
443 | * produced at different times have NAND chips in different banks. | |
444 | */ | |
445 | chipnr = 0; | |
446 | for (bank_idx = 0; bank_idx < JZ_NAND_NUM_BANKS; bank_idx++) { | |
447 | unsigned char bank; | |
448 | ||
449 | /* If there is no platform data, look for NAND in bank 1, | |
450 | * which is the most likely bank since it is the only one | |
451 | * that can be booted from. | |
452 | */ | |
453 | bank = pdata ? pdata->banks[bank_idx] : bank_idx ^ 1; | |
454 | if (bank == 0) | |
455 | break; | |
456 | if (bank > JZ_NAND_NUM_BANKS) { | |
457 | dev_warn(&pdev->dev, | |
458 | "Skipping non-existing bank: %d\n", bank); | |
459 | continue; | |
460 | } | |
461 | /* The detection routine will directly or indirectly call | |
462 | * jz_nand_select_chip(), so nand->banks has to contain the | |
463 | * bank we're checking. | |
464 | */ | |
465 | nand->banks[chipnr] = bank; | |
466 | if (jz_nand_detect_bank(pdev, nand, bank, chipnr, | |
467 | &nand_maf_id, &nand_dev_id) == 0) | |
468 | chipnr++; | |
469 | else | |
470 | nand->banks[chipnr] = 0; | |
471 | } | |
472 | if (chipnr == 0) { | |
473 | dev_err(&pdev->dev, "No NAND chips found\n"); | |
cd145af9 | 474 | goto err_iounmap_mmio; |
ba01d6ec LPC |
475 | } |
476 | ||
477 | if (pdata && pdata->ident_callback) { | |
50533187 | 478 | pdata->ident_callback(pdev, mtd, &pdata->partitions, |
ba01d6ec LPC |
479 | &pdata->num_partitions); |
480 | } | |
481 | ||
482 | ret = nand_scan_tail(mtd); | |
483 | if (ret) { | |
1471d41a MH |
484 | dev_err(&pdev->dev, "Failed to scan NAND\n"); |
485 | goto err_unclaim_banks; | |
ba01d6ec LPC |
486 | } |
487 | ||
42d7fbe2 AB |
488 | ret = mtd_device_parse_register(mtd, NULL, NULL, |
489 | pdata ? pdata->partitions : NULL, | |
490 | pdata ? pdata->num_partitions : 0); | |
ba01d6ec LPC |
491 | |
492 | if (ret) { | |
493 | dev_err(&pdev->dev, "Failed to add mtd device\n"); | |
494 | goto err_nand_release; | |
495 | } | |
496 | ||
497 | dev_info(&pdev->dev, "Successfully registered JZ4740 NAND driver\n"); | |
498 | ||
499 | return 0; | |
500 | ||
501 | err_nand_release: | |
1471d41a MH |
502 | nand_release(mtd); |
503 | err_unclaim_banks: | |
504 | while (chipnr--) { | |
505 | unsigned char bank = nand->banks[chipnr]; | |
506 | gpio_free(JZ_GPIO_MEM_CS0 + bank - 1); | |
507 | jz_nand_iounmap_resource(nand->bank_mem[bank - 1], | |
508 | nand->bank_base[bank - 1]); | |
509 | } | |
510 | writel(0, nand->base + JZ_REG_NAND_CTRL); | |
ba01d6ec | 511 | err_iounmap_mmio: |
1471d41a | 512 | jz_nand_iounmap_resource(nand->mem, nand->base); |
ba01d6ec LPC |
513 | err_free: |
514 | kfree(nand); | |
515 | return ret; | |
516 | } | |
517 | ||
810b7e06 | 518 | static int jz_nand_remove(struct platform_device *pdev) |
ba01d6ec LPC |
519 | { |
520 | struct jz_nand *nand = platform_get_drvdata(pdev); | |
1471d41a | 521 | size_t i; |
ba01d6ec | 522 | |
d25cc7ab | 523 | nand_release(nand_to_mtd(&nand->chip)); |
ba01d6ec LPC |
524 | |
525 | /* Deassert and disable all chips */ | |
526 | writel(0, nand->base + JZ_REG_NAND_CTRL); | |
527 | ||
1471d41a MH |
528 | for (i = 0; i < JZ_NAND_NUM_BANKS; ++i) { |
529 | unsigned char bank = nand->banks[i]; | |
530 | if (bank != 0) { | |
531 | jz_nand_iounmap_resource(nand->bank_mem[bank - 1], | |
532 | nand->bank_base[bank - 1]); | |
533 | gpio_free(JZ_GPIO_MEM_CS0 + bank - 1); | |
534 | } | |
535 | } | |
1471d41a MH |
536 | |
537 | jz_nand_iounmap_resource(nand->mem, nand->base); | |
ba01d6ec | 538 | |
ba01d6ec LPC |
539 | kfree(nand); |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
a338adaf | 544 | static struct platform_driver jz_nand_driver = { |
ba01d6ec | 545 | .probe = jz_nand_probe, |
5153b88c | 546 | .remove = jz_nand_remove, |
ba01d6ec LPC |
547 | .driver = { |
548 | .name = "jz4740-nand", | |
ba01d6ec LPC |
549 | }, |
550 | }; | |
551 | ||
f99640de | 552 | module_platform_driver(jz_nand_driver); |
ba01d6ec LPC |
553 | |
554 | MODULE_LICENSE("GPL"); | |
555 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
556 | MODULE_DESCRIPTION("NAND controller driver for JZ4740 SoC"); | |
557 | MODULE_ALIAS("platform:jz4740-nand"); |