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bb315f74 AG |
1 | /* |
2 | * Copyright 2004-2008 Freescale Semiconductor, Inc. | |
3 | * Copyright 2009 Semihalf. | |
4 | * | |
5 | * Approved as OSADL project by a majority of OSADL members and funded | |
6 | * by OSADL membership fees in 2009; for details see www.osadl.org. | |
7 | * | |
8 | * Based on original driver from Freescale Semiconductor | |
9 | * written by John Rigby <jrigby@freescale.com> on basis | |
10 | * of drivers/mtd/nand/mxc_nand.c. Reworked and extended | |
11 | * Piotr Ziecik <kosmo@semihalf.com>. | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or | |
14 | * modify it under the terms of the GNU General Public License | |
15 | * as published by the Free Software Foundation; either version 2 | |
16 | * of the License, or (at your option) any later version. | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | |
25 | * MA 02110-1301, USA. | |
26 | */ | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/clk.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/io.h> | |
34 | #include <linux/mtd/mtd.h> | |
35 | #include <linux/mtd/nand.h> | |
36 | #include <linux/mtd/partitions.h> | |
37 | #include <linux/of_device.h> | |
38 | #include <linux/of_platform.h> | |
39 | ||
40 | #include <asm/mpc5121.h> | |
41 | ||
42 | /* Addresses for NFC MAIN RAM BUFFER areas */ | |
43 | #define NFC_MAIN_AREA(n) ((n) * 0x200) | |
44 | ||
45 | /* Addresses for NFC SPARE BUFFER areas */ | |
46 | #define NFC_SPARE_BUFFERS 8 | |
47 | #define NFC_SPARE_LEN 0x40 | |
48 | #define NFC_SPARE_AREA(n) (0x1000 + ((n) * NFC_SPARE_LEN)) | |
49 | ||
50 | /* MPC5121 NFC registers */ | |
51 | #define NFC_BUF_ADDR 0x1E04 | |
52 | #define NFC_FLASH_ADDR 0x1E06 | |
53 | #define NFC_FLASH_CMD 0x1E08 | |
54 | #define NFC_CONFIG 0x1E0A | |
55 | #define NFC_ECC_STATUS1 0x1E0C | |
56 | #define NFC_ECC_STATUS2 0x1E0E | |
57 | #define NFC_SPAS 0x1E10 | |
58 | #define NFC_WRPROT 0x1E12 | |
59 | #define NFC_NF_WRPRST 0x1E18 | |
60 | #define NFC_CONFIG1 0x1E1A | |
61 | #define NFC_CONFIG2 0x1E1C | |
62 | #define NFC_UNLOCKSTART_BLK0 0x1E20 | |
63 | #define NFC_UNLOCKEND_BLK0 0x1E22 | |
64 | #define NFC_UNLOCKSTART_BLK1 0x1E24 | |
65 | #define NFC_UNLOCKEND_BLK1 0x1E26 | |
66 | #define NFC_UNLOCKSTART_BLK2 0x1E28 | |
67 | #define NFC_UNLOCKEND_BLK2 0x1E2A | |
68 | #define NFC_UNLOCKSTART_BLK3 0x1E2C | |
69 | #define NFC_UNLOCKEND_BLK3 0x1E2E | |
70 | ||
71 | /* Bit Definitions: NFC_BUF_ADDR */ | |
72 | #define NFC_RBA_MASK (7 << 0) | |
73 | #define NFC_ACTIVE_CS_SHIFT 5 | |
74 | #define NFC_ACTIVE_CS_MASK (3 << NFC_ACTIVE_CS_SHIFT) | |
75 | ||
76 | /* Bit Definitions: NFC_CONFIG */ | |
77 | #define NFC_BLS_UNLOCKED (1 << 1) | |
78 | ||
79 | /* Bit Definitions: NFC_CONFIG1 */ | |
80 | #define NFC_ECC_4BIT (1 << 0) | |
81 | #define NFC_FULL_PAGE_DMA (1 << 1) | |
82 | #define NFC_SPARE_ONLY (1 << 2) | |
83 | #define NFC_ECC_ENABLE (1 << 3) | |
84 | #define NFC_INT_MASK (1 << 4) | |
85 | #define NFC_BIG_ENDIAN (1 << 5) | |
86 | #define NFC_RESET (1 << 6) | |
87 | #define NFC_CE (1 << 7) | |
88 | #define NFC_ONE_CYCLE (1 << 8) | |
89 | #define NFC_PPB_32 (0 << 9) | |
90 | #define NFC_PPB_64 (1 << 9) | |
91 | #define NFC_PPB_128 (2 << 9) | |
92 | #define NFC_PPB_256 (3 << 9) | |
93 | #define NFC_PPB_MASK (3 << 9) | |
94 | #define NFC_FULL_PAGE_INT (1 << 11) | |
95 | ||
96 | /* Bit Definitions: NFC_CONFIG2 */ | |
97 | #define NFC_COMMAND (1 << 0) | |
98 | #define NFC_ADDRESS (1 << 1) | |
99 | #define NFC_INPUT (1 << 2) | |
100 | #define NFC_OUTPUT (1 << 3) | |
101 | #define NFC_ID (1 << 4) | |
102 | #define NFC_STATUS (1 << 5) | |
103 | #define NFC_CMD_FAIL (1 << 15) | |
104 | #define NFC_INT (1 << 15) | |
105 | ||
106 | /* Bit Definitions: NFC_WRPROT */ | |
107 | #define NFC_WPC_LOCK_TIGHT (1 << 0) | |
108 | #define NFC_WPC_LOCK (1 << 1) | |
109 | #define NFC_WPC_UNLOCK (1 << 2) | |
110 | ||
111 | #define DRV_NAME "mpc5121_nfc" | |
112 | ||
113 | /* Timeouts */ | |
114 | #define NFC_RESET_TIMEOUT 1000 /* 1 ms */ | |
115 | #define NFC_TIMEOUT (HZ / 10) /* 1/10 s */ | |
116 | ||
117 | struct mpc5121_nfc_prv { | |
118 | struct mtd_info mtd; | |
119 | struct nand_chip chip; | |
120 | int irq; | |
121 | void __iomem *regs; | |
122 | struct clk *clk; | |
123 | wait_queue_head_t irq_waitq; | |
124 | uint column; | |
125 | int spareonly; | |
126 | void __iomem *csreg; | |
127 | struct device *dev; | |
128 | }; | |
129 | ||
130 | static void mpc5121_nfc_done(struct mtd_info *mtd); | |
131 | ||
132 | #ifdef CONFIG_MTD_PARTITIONS | |
133 | static const char *mpc5121_nfc_pprobes[] = { "cmdlinepart", NULL }; | |
134 | #endif | |
135 | ||
136 | /* Read NFC register */ | |
137 | static inline u16 nfc_read(struct mtd_info *mtd, uint reg) | |
138 | { | |
139 | struct nand_chip *chip = mtd->priv; | |
140 | struct mpc5121_nfc_prv *prv = chip->priv; | |
141 | ||
142 | return in_be16(prv->regs + reg); | |
143 | } | |
144 | ||
145 | /* Write NFC register */ | |
146 | static inline void nfc_write(struct mtd_info *mtd, uint reg, u16 val) | |
147 | { | |
148 | struct nand_chip *chip = mtd->priv; | |
149 | struct mpc5121_nfc_prv *prv = chip->priv; | |
150 | ||
151 | out_be16(prv->regs + reg, val); | |
152 | } | |
153 | ||
154 | /* Set bits in NFC register */ | |
155 | static inline void nfc_set(struct mtd_info *mtd, uint reg, u16 bits) | |
156 | { | |
157 | nfc_write(mtd, reg, nfc_read(mtd, reg) | bits); | |
158 | } | |
159 | ||
160 | /* Clear bits in NFC register */ | |
161 | static inline void nfc_clear(struct mtd_info *mtd, uint reg, u16 bits) | |
162 | { | |
163 | nfc_write(mtd, reg, nfc_read(mtd, reg) & ~bits); | |
164 | } | |
165 | ||
166 | /* Invoke address cycle */ | |
167 | static inline void mpc5121_nfc_send_addr(struct mtd_info *mtd, u16 addr) | |
168 | { | |
169 | nfc_write(mtd, NFC_FLASH_ADDR, addr); | |
170 | nfc_write(mtd, NFC_CONFIG2, NFC_ADDRESS); | |
171 | mpc5121_nfc_done(mtd); | |
172 | } | |
173 | ||
174 | /* Invoke command cycle */ | |
175 | static inline void mpc5121_nfc_send_cmd(struct mtd_info *mtd, u16 cmd) | |
176 | { | |
177 | nfc_write(mtd, NFC_FLASH_CMD, cmd); | |
178 | nfc_write(mtd, NFC_CONFIG2, NFC_COMMAND); | |
179 | mpc5121_nfc_done(mtd); | |
180 | } | |
181 | ||
182 | /* Send data from NFC buffers to NAND flash */ | |
183 | static inline void mpc5121_nfc_send_prog_page(struct mtd_info *mtd) | |
184 | { | |
185 | nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); | |
186 | nfc_write(mtd, NFC_CONFIG2, NFC_INPUT); | |
187 | mpc5121_nfc_done(mtd); | |
188 | } | |
189 | ||
190 | /* Receive data from NAND flash */ | |
191 | static inline void mpc5121_nfc_send_read_page(struct mtd_info *mtd) | |
192 | { | |
193 | nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); | |
194 | nfc_write(mtd, NFC_CONFIG2, NFC_OUTPUT); | |
195 | mpc5121_nfc_done(mtd); | |
196 | } | |
197 | ||
198 | /* Receive ID from NAND flash */ | |
199 | static inline void mpc5121_nfc_send_read_id(struct mtd_info *mtd) | |
200 | { | |
201 | nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); | |
202 | nfc_write(mtd, NFC_CONFIG2, NFC_ID); | |
203 | mpc5121_nfc_done(mtd); | |
204 | } | |
205 | ||
206 | /* Receive status from NAND flash */ | |
207 | static inline void mpc5121_nfc_send_read_status(struct mtd_info *mtd) | |
208 | { | |
209 | nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK); | |
210 | nfc_write(mtd, NFC_CONFIG2, NFC_STATUS); | |
211 | mpc5121_nfc_done(mtd); | |
212 | } | |
213 | ||
214 | /* NFC interrupt handler */ | |
215 | static irqreturn_t mpc5121_nfc_irq(int irq, void *data) | |
216 | { | |
217 | struct mtd_info *mtd = data; | |
218 | struct nand_chip *chip = mtd->priv; | |
219 | struct mpc5121_nfc_prv *prv = chip->priv; | |
220 | ||
221 | nfc_set(mtd, NFC_CONFIG1, NFC_INT_MASK); | |
222 | wake_up(&prv->irq_waitq); | |
223 | ||
224 | return IRQ_HANDLED; | |
225 | } | |
226 | ||
227 | /* Wait for operation complete */ | |
228 | static void mpc5121_nfc_done(struct mtd_info *mtd) | |
229 | { | |
230 | struct nand_chip *chip = mtd->priv; | |
231 | struct mpc5121_nfc_prv *prv = chip->priv; | |
232 | int rv; | |
233 | ||
234 | if ((nfc_read(mtd, NFC_CONFIG2) & NFC_INT) == 0) { | |
235 | nfc_clear(mtd, NFC_CONFIG1, NFC_INT_MASK); | |
236 | rv = wait_event_timeout(prv->irq_waitq, | |
237 | (nfc_read(mtd, NFC_CONFIG2) & NFC_INT), NFC_TIMEOUT); | |
238 | ||
239 | if (!rv) | |
240 | dev_warn(prv->dev, | |
241 | "Timeout while waiting for interrupt.\n"); | |
242 | } | |
243 | ||
244 | nfc_clear(mtd, NFC_CONFIG2, NFC_INT); | |
245 | } | |
246 | ||
247 | /* Do address cycle(s) */ | |
248 | static void mpc5121_nfc_addr_cycle(struct mtd_info *mtd, int column, int page) | |
249 | { | |
250 | struct nand_chip *chip = mtd->priv; | |
251 | u32 pagemask = chip->pagemask; | |
252 | ||
253 | if (column != -1) { | |
254 | mpc5121_nfc_send_addr(mtd, column); | |
255 | if (mtd->writesize > 512) | |
256 | mpc5121_nfc_send_addr(mtd, column >> 8); | |
257 | } | |
258 | ||
259 | if (page != -1) { | |
260 | do { | |
261 | mpc5121_nfc_send_addr(mtd, page & 0xFF); | |
262 | page >>= 8; | |
263 | pagemask >>= 8; | |
264 | } while (pagemask); | |
265 | } | |
266 | } | |
267 | ||
268 | /* Control chip select signals */ | |
269 | static void mpc5121_nfc_select_chip(struct mtd_info *mtd, int chip) | |
270 | { | |
271 | if (chip < 0) { | |
272 | nfc_clear(mtd, NFC_CONFIG1, NFC_CE); | |
273 | return; | |
274 | } | |
275 | ||
276 | nfc_clear(mtd, NFC_BUF_ADDR, NFC_ACTIVE_CS_MASK); | |
277 | nfc_set(mtd, NFC_BUF_ADDR, (chip << NFC_ACTIVE_CS_SHIFT) & | |
278 | NFC_ACTIVE_CS_MASK); | |
279 | nfc_set(mtd, NFC_CONFIG1, NFC_CE); | |
280 | } | |
281 | ||
282 | /* Init external chip select logic on ADS5121 board */ | |
283 | static int ads5121_chipselect_init(struct mtd_info *mtd) | |
284 | { | |
285 | struct nand_chip *chip = mtd->priv; | |
286 | struct mpc5121_nfc_prv *prv = chip->priv; | |
287 | struct device_node *dn; | |
288 | ||
289 | dn = of_find_compatible_node(NULL, NULL, "fsl,mpc5121ads-cpld"); | |
290 | if (dn) { | |
291 | prv->csreg = of_iomap(dn, 0); | |
292 | of_node_put(dn); | |
293 | if (!prv->csreg) | |
294 | return -ENOMEM; | |
295 | ||
296 | /* CPLD Register 9 controls NAND /CE Lines */ | |
297 | prv->csreg += 9; | |
298 | return 0; | |
299 | } | |
300 | ||
301 | return -EINVAL; | |
302 | } | |
303 | ||
304 | /* Control chips select signal on ADS5121 board */ | |
305 | static void ads5121_select_chip(struct mtd_info *mtd, int chip) | |
306 | { | |
307 | struct nand_chip *nand = mtd->priv; | |
308 | struct mpc5121_nfc_prv *prv = nand->priv; | |
309 | u8 v; | |
310 | ||
311 | v = in_8(prv->csreg); | |
312 | v |= 0x0F; | |
313 | ||
314 | if (chip >= 0) { | |
315 | mpc5121_nfc_select_chip(mtd, 0); | |
316 | v &= ~(1 << chip); | |
317 | } else | |
318 | mpc5121_nfc_select_chip(mtd, -1); | |
319 | ||
320 | out_8(prv->csreg, v); | |
321 | } | |
322 | ||
323 | /* Read NAND Ready/Busy signal */ | |
324 | static int mpc5121_nfc_dev_ready(struct mtd_info *mtd) | |
325 | { | |
326 | /* | |
327 | * NFC handles ready/busy signal internally. Therefore, this function | |
328 | * always returns status as ready. | |
329 | */ | |
330 | return 1; | |
331 | } | |
332 | ||
333 | /* Write command to NAND flash */ | |
334 | static void mpc5121_nfc_command(struct mtd_info *mtd, unsigned command, | |
335 | int column, int page) | |
336 | { | |
337 | struct nand_chip *chip = mtd->priv; | |
338 | struct mpc5121_nfc_prv *prv = chip->priv; | |
339 | ||
340 | prv->column = (column >= 0) ? column : 0; | |
341 | prv->spareonly = 0; | |
342 | ||
343 | switch (command) { | |
344 | case NAND_CMD_PAGEPROG: | |
345 | mpc5121_nfc_send_prog_page(mtd); | |
346 | break; | |
347 | /* | |
348 | * NFC does not support sub-page reads and writes, | |
349 | * so emulate them using full page transfers. | |
350 | */ | |
351 | case NAND_CMD_READ0: | |
352 | column = 0; | |
353 | break; | |
354 | ||
355 | case NAND_CMD_READ1: | |
356 | prv->column += 256; | |
357 | command = NAND_CMD_READ0; | |
358 | column = 0; | |
359 | break; | |
360 | ||
361 | case NAND_CMD_READOOB: | |
362 | prv->spareonly = 1; | |
363 | command = NAND_CMD_READ0; | |
364 | column = 0; | |
365 | break; | |
366 | ||
367 | case NAND_CMD_SEQIN: | |
368 | mpc5121_nfc_command(mtd, NAND_CMD_READ0, column, page); | |
369 | column = 0; | |
370 | break; | |
371 | ||
372 | case NAND_CMD_ERASE1: | |
373 | case NAND_CMD_ERASE2: | |
374 | case NAND_CMD_READID: | |
375 | case NAND_CMD_STATUS: | |
376 | break; | |
377 | ||
378 | default: | |
379 | return; | |
380 | } | |
381 | ||
382 | mpc5121_nfc_send_cmd(mtd, command); | |
383 | mpc5121_nfc_addr_cycle(mtd, column, page); | |
384 | ||
385 | switch (command) { | |
386 | case NAND_CMD_READ0: | |
387 | if (mtd->writesize > 512) | |
388 | mpc5121_nfc_send_cmd(mtd, NAND_CMD_READSTART); | |
389 | mpc5121_nfc_send_read_page(mtd); | |
390 | break; | |
391 | ||
392 | case NAND_CMD_READID: | |
393 | mpc5121_nfc_send_read_id(mtd); | |
394 | break; | |
395 | ||
396 | case NAND_CMD_STATUS: | |
397 | mpc5121_nfc_send_read_status(mtd); | |
398 | if (chip->options & NAND_BUSWIDTH_16) | |
399 | prv->column = 1; | |
400 | else | |
401 | prv->column = 0; | |
402 | break; | |
403 | } | |
404 | } | |
405 | ||
406 | /* Copy data from/to NFC spare buffers. */ | |
407 | static void mpc5121_nfc_copy_spare(struct mtd_info *mtd, uint offset, | |
408 | u8 *buffer, uint size, int wr) | |
409 | { | |
410 | struct nand_chip *nand = mtd->priv; | |
411 | struct mpc5121_nfc_prv *prv = nand->priv; | |
412 | uint o, s, sbsize, blksize; | |
413 | ||
414 | /* | |
415 | * NAND spare area is available through NFC spare buffers. | |
416 | * The NFC divides spare area into (page_size / 512) chunks. | |
417 | * Each chunk is placed into separate spare memory area, using | |
418 | * first (spare_size / num_of_chunks) bytes of the buffer. | |
419 | * | |
420 | * For NAND device in which the spare area is not divided fully | |
421 | * by the number of chunks, number of used bytes in each spare | |
422 | * buffer is rounded down to the nearest even number of bytes, | |
423 | * and all remaining bytes are added to the last used spare area. | |
424 | * | |
425 | * For more information read section 26.6.10 of MPC5121e | |
426 | * Microcontroller Reference Manual, Rev. 3. | |
427 | */ | |
428 | ||
429 | /* Calculate number of valid bytes in each spare buffer */ | |
430 | sbsize = (mtd->oobsize / (mtd->writesize / 512)) & ~1; | |
431 | ||
432 | while (size) { | |
433 | /* Calculate spare buffer number */ | |
434 | s = offset / sbsize; | |
435 | if (s > NFC_SPARE_BUFFERS - 1) | |
436 | s = NFC_SPARE_BUFFERS - 1; | |
437 | ||
438 | /* | |
439 | * Calculate offset to requested data block in selected spare | |
440 | * buffer and its size. | |
441 | */ | |
442 | o = offset - (s * sbsize); | |
443 | blksize = min(sbsize - o, size); | |
444 | ||
445 | if (wr) | |
446 | memcpy_toio(prv->regs + NFC_SPARE_AREA(s) + o, | |
447 | buffer, blksize); | |
448 | else | |
449 | memcpy_fromio(buffer, | |
450 | prv->regs + NFC_SPARE_AREA(s) + o, blksize); | |
451 | ||
452 | buffer += blksize; | |
453 | offset += blksize; | |
454 | size -= blksize; | |
455 | }; | |
456 | } | |
457 | ||
458 | /* Copy data from/to NFC main and spare buffers */ | |
459 | static void mpc5121_nfc_buf_copy(struct mtd_info *mtd, u_char *buf, int len, | |
460 | int wr) | |
461 | { | |
462 | struct nand_chip *chip = mtd->priv; | |
463 | struct mpc5121_nfc_prv *prv = chip->priv; | |
464 | uint c = prv->column; | |
465 | uint l; | |
466 | ||
467 | /* Handle spare area access */ | |
468 | if (prv->spareonly || c >= mtd->writesize) { | |
469 | /* Calculate offset from beginning of spare area */ | |
470 | if (c >= mtd->writesize) | |
471 | c -= mtd->writesize; | |
472 | ||
473 | prv->column += len; | |
474 | mpc5121_nfc_copy_spare(mtd, c, buf, len, wr); | |
475 | return; | |
476 | } | |
477 | ||
478 | /* | |
479 | * Handle main area access - limit copy length to prevent | |
480 | * crossing main/spare boundary. | |
481 | */ | |
482 | l = min((uint)len, mtd->writesize - c); | |
483 | prv->column += l; | |
484 | ||
485 | if (wr) | |
486 | memcpy_toio(prv->regs + NFC_MAIN_AREA(0) + c, buf, l); | |
487 | else | |
488 | memcpy_fromio(buf, prv->regs + NFC_MAIN_AREA(0) + c, l); | |
489 | ||
490 | /* Handle crossing main/spare boundary */ | |
491 | if (l != len) { | |
492 | buf += l; | |
493 | len -= l; | |
494 | mpc5121_nfc_buf_copy(mtd, buf, len, wr); | |
495 | } | |
496 | } | |
497 | ||
498 | /* Read data from NFC buffers */ | |
499 | static void mpc5121_nfc_read_buf(struct mtd_info *mtd, u_char *buf, int len) | |
500 | { | |
501 | mpc5121_nfc_buf_copy(mtd, buf, len, 0); | |
502 | } | |
503 | ||
504 | /* Write data to NFC buffers */ | |
505 | static void mpc5121_nfc_write_buf(struct mtd_info *mtd, | |
506 | const u_char *buf, int len) | |
507 | { | |
508 | mpc5121_nfc_buf_copy(mtd, (u_char *)buf, len, 1); | |
509 | } | |
510 | ||
511 | /* Compare buffer with NAND flash */ | |
512 | static int mpc5121_nfc_verify_buf(struct mtd_info *mtd, | |
513 | const u_char *buf, int len) | |
514 | { | |
515 | u_char tmp[256]; | |
516 | uint bsize; | |
517 | ||
518 | while (len) { | |
519 | bsize = min(len, 256); | |
520 | mpc5121_nfc_read_buf(mtd, tmp, bsize); | |
521 | ||
522 | if (memcmp(buf, tmp, bsize)) | |
523 | return 1; | |
524 | ||
525 | buf += bsize; | |
526 | len -= bsize; | |
527 | } | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
532 | /* Read byte from NFC buffers */ | |
533 | static u8 mpc5121_nfc_read_byte(struct mtd_info *mtd) | |
534 | { | |
535 | u8 tmp; | |
536 | ||
537 | mpc5121_nfc_read_buf(mtd, &tmp, sizeof(tmp)); | |
538 | ||
539 | return tmp; | |
540 | } | |
541 | ||
542 | /* Read word from NFC buffers */ | |
543 | static u16 mpc5121_nfc_read_word(struct mtd_info *mtd) | |
544 | { | |
545 | u16 tmp; | |
546 | ||
547 | mpc5121_nfc_read_buf(mtd, (u_char *)&tmp, sizeof(tmp)); | |
548 | ||
549 | return tmp; | |
550 | } | |
551 | ||
552 | /* | |
553 | * Read NFC configuration from Reset Config Word | |
554 | * | |
555 | * NFC is configured during reset in basis of information stored | |
556 | * in Reset Config Word. There is no other way to set NAND block | |
557 | * size, spare size and bus width. | |
558 | */ | |
559 | static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd) | |
560 | { | |
561 | struct nand_chip *chip = mtd->priv; | |
562 | struct mpc5121_nfc_prv *prv = chip->priv; | |
563 | struct mpc512x_reset_module *rm; | |
564 | struct device_node *rmnode; | |
565 | uint rcw_pagesize = 0; | |
566 | uint rcw_sparesize = 0; | |
567 | uint rcw_width; | |
568 | uint rcwh; | |
569 | uint romloc, ps; | |
570 | ||
571 | rmnode = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-reset"); | |
572 | if (!rmnode) { | |
573 | dev_err(prv->dev, "Missing 'fsl,mpc5121-reset' " | |
574 | "node in device tree!\n"); | |
575 | return -ENODEV; | |
576 | } | |
577 | ||
578 | rm = of_iomap(rmnode, 0); | |
579 | if (!rm) { | |
580 | dev_err(prv->dev, "Error mapping reset module node!\n"); | |
581 | return -EBUSY; | |
582 | } | |
583 | ||
584 | rcwh = in_be32(&rm->rcwhr); | |
585 | ||
586 | /* Bit 6: NFC bus width */ | |
587 | rcw_width = ((rcwh >> 6) & 0x1) ? 2 : 1; | |
588 | ||
589 | /* Bit 7: NFC Page/Spare size */ | |
590 | ps = (rcwh >> 7) & 0x1; | |
591 | ||
592 | /* Bits [22:21]: ROM Location */ | |
593 | romloc = (rcwh >> 21) & 0x3; | |
594 | ||
595 | /* Decode RCW bits */ | |
596 | switch ((ps << 2) | romloc) { | |
597 | case 0x00: | |
598 | case 0x01: | |
599 | rcw_pagesize = 512; | |
600 | rcw_sparesize = 16; | |
601 | break; | |
602 | case 0x02: | |
603 | case 0x03: | |
604 | rcw_pagesize = 4096; | |
605 | rcw_sparesize = 128; | |
606 | break; | |
607 | case 0x04: | |
608 | case 0x05: | |
609 | rcw_pagesize = 2048; | |
610 | rcw_sparesize = 64; | |
611 | break; | |
612 | case 0x06: | |
613 | case 0x07: | |
614 | rcw_pagesize = 4096; | |
615 | rcw_sparesize = 218; | |
616 | break; | |
617 | } | |
618 | ||
619 | mtd->writesize = rcw_pagesize; | |
620 | mtd->oobsize = rcw_sparesize; | |
621 | if (rcw_width == 2) | |
622 | chip->options |= NAND_BUSWIDTH_16; | |
623 | ||
624 | dev_notice(prv->dev, "Configured for " | |
625 | "%u-bit NAND, page size %u " | |
626 | "with %u spare.\n", | |
627 | rcw_width * 8, rcw_pagesize, | |
628 | rcw_sparesize); | |
629 | iounmap(rm); | |
630 | of_node_put(rmnode); | |
631 | return 0; | |
632 | } | |
633 | ||
634 | /* Free driver resources */ | |
635 | static void mpc5121_nfc_free(struct device *dev, struct mtd_info *mtd) | |
636 | { | |
637 | struct nand_chip *chip = mtd->priv; | |
638 | struct mpc5121_nfc_prv *prv = chip->priv; | |
639 | ||
640 | if (prv->clk) { | |
641 | clk_disable(prv->clk); | |
642 | clk_put(prv->clk); | |
643 | } | |
644 | ||
645 | if (prv->csreg) | |
646 | iounmap(prv->csreg); | |
647 | } | |
648 | ||
649 | static int __devinit mpc5121_nfc_probe(struct of_device *op, | |
650 | const struct of_device_id *match) | |
651 | { | |
652 | struct device_node *rootnode, *dn = op->node; | |
653 | struct device *dev = &op->dev; | |
654 | struct mpc5121_nfc_prv *prv; | |
655 | struct resource res; | |
656 | struct mtd_info *mtd; | |
657 | #ifdef CONFIG_MTD_PARTITIONS | |
658 | struct mtd_partition *parts; | |
659 | #endif | |
660 | struct nand_chip *chip; | |
661 | unsigned long regs_paddr, regs_size; | |
662 | const uint *chips_no; | |
663 | int resettime = 0; | |
664 | int retval = 0; | |
665 | int rev, len; | |
666 | ||
667 | /* | |
668 | * Check SoC revision. This driver supports only NFC | |
669 | * in MPC5121 revision 2. | |
670 | */ | |
671 | rev = (mfspr(SPRN_SVR) >> 4) & 0xF; | |
672 | if (rev != 2) { | |
673 | dev_err(dev, "SoC revision %u is not supported!\n", rev); | |
674 | return -ENXIO; | |
675 | } | |
676 | ||
677 | prv = devm_kzalloc(dev, sizeof(*prv), GFP_KERNEL); | |
678 | if (!prv) { | |
679 | dev_err(dev, "Memory exhausted!\n"); | |
680 | return -ENOMEM; | |
681 | } | |
682 | ||
683 | mtd = &prv->mtd; | |
684 | chip = &prv->chip; | |
685 | ||
686 | mtd->priv = chip; | |
687 | chip->priv = prv; | |
688 | prv->dev = dev; | |
689 | ||
690 | /* Read NFC configuration from Reset Config Word */ | |
691 | retval = mpc5121_nfc_read_hw_config(mtd); | |
692 | if (retval) { | |
693 | dev_err(dev, "Unable to read NFC config!\n"); | |
694 | return retval; | |
695 | } | |
696 | ||
697 | prv->irq = irq_of_parse_and_map(dn, 0); | |
698 | if (prv->irq == NO_IRQ) { | |
699 | dev_err(dev, "Error mapping IRQ!\n"); | |
700 | return -EINVAL; | |
701 | } | |
702 | ||
703 | retval = of_address_to_resource(dn, 0, &res); | |
704 | if (retval) { | |
705 | dev_err(dev, "Error parsing memory region!\n"); | |
706 | return retval; | |
707 | } | |
708 | ||
709 | chips_no = of_get_property(dn, "chips", &len); | |
710 | if (!chips_no || len != sizeof(*chips_no)) { | |
711 | dev_err(dev, "Invalid/missing 'chips' property!\n"); | |
712 | return -EINVAL; | |
713 | } | |
714 | ||
715 | regs_paddr = res.start; | |
716 | regs_size = res.end - res.start + 1; | |
717 | ||
718 | if (!devm_request_mem_region(dev, regs_paddr, regs_size, DRV_NAME)) { | |
719 | dev_err(dev, "Error requesting memory region!\n"); | |
720 | return -EBUSY; | |
721 | } | |
722 | ||
723 | prv->regs = devm_ioremap(dev, regs_paddr, regs_size); | |
724 | if (!prv->regs) { | |
725 | dev_err(dev, "Error mapping memory region!\n"); | |
726 | return -ENOMEM; | |
727 | } | |
728 | ||
729 | mtd->name = "MPC5121 NAND"; | |
730 | chip->dev_ready = mpc5121_nfc_dev_ready; | |
731 | chip->cmdfunc = mpc5121_nfc_command; | |
732 | chip->read_byte = mpc5121_nfc_read_byte; | |
733 | chip->read_word = mpc5121_nfc_read_word; | |
734 | chip->read_buf = mpc5121_nfc_read_buf; | |
735 | chip->write_buf = mpc5121_nfc_write_buf; | |
736 | chip->verify_buf = mpc5121_nfc_verify_buf; | |
737 | chip->select_chip = mpc5121_nfc_select_chip; | |
738 | chip->options = NAND_NO_AUTOINCR | NAND_USE_FLASH_BBT; | |
739 | chip->ecc.mode = NAND_ECC_SOFT; | |
740 | ||
741 | /* Support external chip-select logic on ADS5121 board */ | |
742 | rootnode = of_find_node_by_path("/"); | |
743 | if (of_device_is_compatible(rootnode, "fsl,mpc5121ads")) { | |
744 | retval = ads5121_chipselect_init(mtd); | |
745 | if (retval) { | |
746 | dev_err(dev, "Chipselect init error!\n"); | |
747 | of_node_put(rootnode); | |
748 | return retval; | |
749 | } | |
750 | ||
751 | chip->select_chip = ads5121_select_chip; | |
752 | } | |
753 | of_node_put(rootnode); | |
754 | ||
755 | /* Enable NFC clock */ | |
756 | prv->clk = clk_get(dev, "nfc_clk"); | |
757 | if (!prv->clk) { | |
758 | dev_err(dev, "Unable to acquire NFC clock!\n"); | |
759 | retval = -ENODEV; | |
760 | goto error; | |
761 | } | |
762 | ||
763 | clk_enable(prv->clk); | |
764 | ||
765 | /* Reset NAND Flash controller */ | |
766 | nfc_set(mtd, NFC_CONFIG1, NFC_RESET); | |
767 | while (nfc_read(mtd, NFC_CONFIG1) & NFC_RESET) { | |
768 | if (resettime++ >= NFC_RESET_TIMEOUT) { | |
769 | dev_err(dev, "Timeout while resetting NFC!\n"); | |
770 | retval = -EINVAL; | |
771 | goto error; | |
772 | } | |
773 | ||
774 | udelay(1); | |
775 | } | |
776 | ||
777 | /* Enable write to NFC memory */ | |
778 | nfc_write(mtd, NFC_CONFIG, NFC_BLS_UNLOCKED); | |
779 | ||
780 | /* Enable write to all NAND pages */ | |
781 | nfc_write(mtd, NFC_UNLOCKSTART_BLK0, 0x0000); | |
782 | nfc_write(mtd, NFC_UNLOCKEND_BLK0, 0xFFFF); | |
783 | nfc_write(mtd, NFC_WRPROT, NFC_WPC_UNLOCK); | |
784 | ||
785 | /* | |
786 | * Setup NFC: | |
787 | * - Big Endian transfers, | |
788 | * - Interrupt after full page read/write. | |
789 | */ | |
790 | nfc_write(mtd, NFC_CONFIG1, NFC_BIG_ENDIAN | NFC_INT_MASK | | |
791 | NFC_FULL_PAGE_INT); | |
792 | ||
793 | /* Set spare area size */ | |
794 | nfc_write(mtd, NFC_SPAS, mtd->oobsize >> 1); | |
795 | ||
796 | init_waitqueue_head(&prv->irq_waitq); | |
797 | retval = devm_request_irq(dev, prv->irq, &mpc5121_nfc_irq, 0, DRV_NAME, | |
798 | mtd); | |
799 | if (retval) { | |
800 | dev_err(dev, "Error requesting IRQ!\n"); | |
801 | goto error; | |
802 | } | |
803 | ||
804 | /* Detect NAND chips */ | |
805 | if (nand_scan(mtd, *chips_no)) { | |
806 | dev_err(dev, "NAND Flash not found !\n"); | |
807 | devm_free_irq(dev, prv->irq, mtd); | |
808 | retval = -ENXIO; | |
809 | goto error; | |
810 | } | |
811 | ||
812 | /* Set erase block size */ | |
813 | switch (mtd->erasesize / mtd->writesize) { | |
814 | case 32: | |
815 | nfc_set(mtd, NFC_CONFIG1, NFC_PPB_32); | |
816 | break; | |
817 | ||
818 | case 64: | |
819 | nfc_set(mtd, NFC_CONFIG1, NFC_PPB_64); | |
820 | break; | |
821 | ||
822 | case 128: | |
823 | nfc_set(mtd, NFC_CONFIG1, NFC_PPB_128); | |
824 | break; | |
825 | ||
826 | case 256: | |
827 | nfc_set(mtd, NFC_CONFIG1, NFC_PPB_256); | |
828 | break; | |
829 | ||
830 | default: | |
831 | dev_err(dev, "Unsupported NAND flash!\n"); | |
832 | devm_free_irq(dev, prv->irq, mtd); | |
833 | retval = -ENXIO; | |
834 | goto error; | |
835 | } | |
836 | ||
837 | dev_set_drvdata(dev, mtd); | |
838 | ||
839 | /* Register device in MTD */ | |
840 | #ifdef CONFIG_MTD_PARTITIONS | |
841 | retval = parse_mtd_partitions(mtd, mpc5121_nfc_pprobes, &parts, 0); | |
842 | #ifdef CONFIG_MTD_OF_PARTS | |
843 | if (retval == 0) | |
844 | retval = of_mtd_parse_partitions(dev, dn, &parts); | |
845 | #endif | |
846 | if (retval < 0) { | |
847 | dev_err(dev, "Error parsing MTD partitions!\n"); | |
848 | devm_free_irq(dev, prv->irq, mtd); | |
849 | retval = -EINVAL; | |
850 | goto error; | |
851 | } | |
852 | ||
853 | if (retval > 0) | |
854 | retval = add_mtd_partitions(mtd, parts, retval); | |
855 | else | |
856 | #endif | |
857 | retval = add_mtd_device(mtd); | |
858 | ||
859 | if (retval) { | |
860 | dev_err(dev, "Error adding MTD device!\n"); | |
861 | devm_free_irq(dev, prv->irq, mtd); | |
862 | goto error; | |
863 | } | |
864 | ||
865 | return 0; | |
866 | error: | |
867 | mpc5121_nfc_free(dev, mtd); | |
868 | return retval; | |
869 | } | |
870 | ||
871 | static int __devexit mpc5121_nfc_remove(struct of_device *op) | |
872 | { | |
873 | struct device *dev = &op->dev; | |
874 | struct mtd_info *mtd = dev_get_drvdata(dev); | |
875 | struct nand_chip *chip = mtd->priv; | |
876 | struct mpc5121_nfc_prv *prv = chip->priv; | |
877 | ||
878 | nand_release(mtd); | |
879 | devm_free_irq(dev, prv->irq, mtd); | |
880 | mpc5121_nfc_free(dev, mtd); | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
885 | static struct of_device_id mpc5121_nfc_match[] __devinitdata = { | |
886 | { .compatible = "fsl,mpc5121-nfc", }, | |
887 | {}, | |
888 | }; | |
889 | ||
890 | static struct of_platform_driver mpc5121_nfc_driver = { | |
891 | .match_table = mpc5121_nfc_match, | |
892 | .probe = mpc5121_nfc_probe, | |
893 | .remove = __devexit_p(mpc5121_nfc_remove), | |
894 | .driver = { | |
895 | .name = DRV_NAME, | |
896 | .owner = THIS_MODULE, | |
897 | }, | |
898 | }; | |
899 | ||
900 | static int __init mpc5121_nfc_init(void) | |
901 | { | |
902 | return of_register_platform_driver(&mpc5121_nfc_driver); | |
903 | } | |
904 | ||
905 | module_init(mpc5121_nfc_init); | |
906 | ||
907 | static void __exit mpc5121_nfc_cleanup(void) | |
908 | { | |
909 | of_unregister_platform_driver(&mpc5121_nfc_driver); | |
910 | } | |
911 | ||
912 | module_exit(mpc5121_nfc_cleanup); | |
913 | ||
914 | MODULE_AUTHOR("Freescale Semiconductor, Inc."); | |
915 | MODULE_DESCRIPTION("MPC5121 NAND MTD driver"); | |
916 | MODULE_LICENSE("GPL"); |