1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright 2004-2008 Freescale Semiconductor, Inc.
4 * Copyright 2009 Semihalf.
5 *
6 * Approved as OSADL project by a majority of OSADL members and funded
7 * by OSADL membership fees in 2009; for details see www.osadl.org.
8 *
9 * Based on original driver from Freescale Semiconductor
10 * written by John Rigby <jrigby@freescale.com> on basis of mxc_nand.c.
11 * Reworked and extended by Piotr Ziecik <kosmo@semihalf.com>.
12 */
13
14 #include <linux/module.h>
15 #include <linux/clk.h>
16 #include <linux/gfp.h>
17 #include <linux/delay.h>
18 #include <linux/err.h>
19 #include <linux/interrupt.h>
20 #include <linux/io.h>
21 #include <linux/mtd/mtd.h>
22 #include <linux/mtd/rawnand.h>
23 #include <linux/mtd/partitions.h>
24 #include <linux/of_address.h>
25 #include <linux/of_device.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_platform.h>
28
29 #include <asm/mpc5121.h>
30
31 /* Addresses for NFC MAIN RAM BUFFER areas */
32 #define NFC_MAIN_AREA(n) ((n) * 0x200)
33
34 /* Addresses for NFC SPARE BUFFER areas */
35 #define NFC_SPARE_BUFFERS 8
36 #define NFC_SPARE_LEN 0x40
37 #define NFC_SPARE_AREA(n) (0x1000 + ((n) * NFC_SPARE_LEN))
38
39 /* MPC5121 NFC registers */
40 #define NFC_BUF_ADDR 0x1E04
41 #define NFC_FLASH_ADDR 0x1E06
42 #define NFC_FLASH_CMD 0x1E08
43 #define NFC_CONFIG 0x1E0A
44 #define NFC_ECC_STATUS1 0x1E0C
45 #define NFC_ECC_STATUS2 0x1E0E
46 #define NFC_SPAS 0x1E10
47 #define NFC_WRPROT 0x1E12
48 #define NFC_NF_WRPRST 0x1E18
49 #define NFC_CONFIG1 0x1E1A
50 #define NFC_CONFIG2 0x1E1C
51 #define NFC_UNLOCKSTART_BLK0 0x1E20
52 #define NFC_UNLOCKEND_BLK0 0x1E22
53 #define NFC_UNLOCKSTART_BLK1 0x1E24
54 #define NFC_UNLOCKEND_BLK1 0x1E26
55 #define NFC_UNLOCKSTART_BLK2 0x1E28
56 #define NFC_UNLOCKEND_BLK2 0x1E2A
57 #define NFC_UNLOCKSTART_BLK3 0x1E2C
58 #define NFC_UNLOCKEND_BLK3 0x1E2E
59
60 /* Bit Definitions: NFC_BUF_ADDR */
61 #define NFC_RBA_MASK (7 << 0)
62 #define NFC_ACTIVE_CS_SHIFT 5
63 #define NFC_ACTIVE_CS_MASK (3 << NFC_ACTIVE_CS_SHIFT)
64
65 /* Bit Definitions: NFC_CONFIG */
66 #define NFC_BLS_UNLOCKED (1 << 1)
67
68 /* Bit Definitions: NFC_CONFIG1 */
69 #define NFC_ECC_4BIT (1 << 0)
70 #define NFC_FULL_PAGE_DMA (1 << 1)
71 #define NFC_SPARE_ONLY (1 << 2)
72 #define NFC_ECC_ENABLE (1 << 3)
73 #define NFC_INT_MASK (1 << 4)
74 #define NFC_BIG_ENDIAN (1 << 5)
75 #define NFC_RESET (1 << 6)
76 #define NFC_CE (1 << 7)
77 #define NFC_ONE_CYCLE (1 << 8)
78 #define NFC_PPB_32 (0 << 9)
79 #define NFC_PPB_64 (1 << 9)
80 #define NFC_PPB_128 (2 << 9)
81 #define NFC_PPB_256 (3 << 9)
82 #define NFC_PPB_MASK (3 << 9)
83 #define NFC_FULL_PAGE_INT (1 << 11)
84
85 /* Bit Definitions: NFC_CONFIG2 */
86 #define NFC_COMMAND (1 << 0)
87 #define NFC_ADDRESS (1 << 1)
88 #define NFC_INPUT (1 << 2)
89 #define NFC_OUTPUT (1 << 3)
90 #define NFC_ID (1 << 4)
91 #define NFC_STATUS (1 << 5)
92 #define NFC_CMD_FAIL (1 << 15)
93 #define NFC_INT (1 << 15)
94
95 /* Bit Definitions: NFC_WRPROT */
96 #define NFC_WPC_LOCK_TIGHT (1 << 0)
97 #define NFC_WPC_LOCK (1 << 1)
98 #define NFC_WPC_UNLOCK (1 << 2)
99
100 #define DRV_NAME "mpc5121_nfc"
101
102 /* Timeouts */
103 #define NFC_RESET_TIMEOUT 1000 /* 1 ms */
104 #define NFC_TIMEOUT (HZ / 10) /* 1/10 s */
105
106 struct mpc5121_nfc_prv {
107 struct nand_controller controller;
108 struct nand_chip chip;
109 int irq;
110 void __iomem *regs;
111 struct clk *clk;
112 wait_queue_head_t irq_waitq;
113 uint column;
114 int spareonly;
115 void __iomem *csreg;
116 struct device *dev;
117 };
118
119 static void mpc5121_nfc_done(struct mtd_info *mtd);
120
121 /* Read NFC register */
nfc_read(struct mtd_info * mtd,uint reg)122 static inline u16 nfc_read(struct mtd_info *mtd, uint reg)
123 {
124 struct nand_chip *chip = mtd_to_nand(mtd);
125 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip);
126
127 return in_be16(prv->regs + reg);
128 }
129
130 /* Write NFC register */
nfc_write(struct mtd_info * mtd,uint reg,u16 val)131 static inline void nfc_write(struct mtd_info *mtd, uint reg, u16 val)
132 {
133 struct nand_chip *chip = mtd_to_nand(mtd);
134 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip);
135
136 out_be16(prv->regs + reg, val);
137 }
138
139 /* Set bits in NFC register */
nfc_set(struct mtd_info * mtd,uint reg,u16 bits)140 static inline void nfc_set(struct mtd_info *mtd, uint reg, u16 bits)
141 {
142 nfc_write(mtd, reg, nfc_read(mtd, reg) | bits);
143 }
144
145 /* Clear bits in NFC register */
nfc_clear(struct mtd_info * mtd,uint reg,u16 bits)146 static inline void nfc_clear(struct mtd_info *mtd, uint reg, u16 bits)
147 {
148 nfc_write(mtd, reg, nfc_read(mtd, reg) & ~bits);
149 }
150
151 /* Invoke address cycle */
mpc5121_nfc_send_addr(struct mtd_info * mtd,u16 addr)152 static inline void mpc5121_nfc_send_addr(struct mtd_info *mtd, u16 addr)
153 {
154 nfc_write(mtd, NFC_FLASH_ADDR, addr);
155 nfc_write(mtd, NFC_CONFIG2, NFC_ADDRESS);
156 mpc5121_nfc_done(mtd);
157 }
158
159 /* Invoke command cycle */
mpc5121_nfc_send_cmd(struct mtd_info * mtd,u16 cmd)160 static inline void mpc5121_nfc_send_cmd(struct mtd_info *mtd, u16 cmd)
161 {
162 nfc_write(mtd, NFC_FLASH_CMD, cmd);
163 nfc_write(mtd, NFC_CONFIG2, NFC_COMMAND);
164 mpc5121_nfc_done(mtd);
165 }
166
167 /* Send data from NFC buffers to NAND flash */
mpc5121_nfc_send_prog_page(struct mtd_info * mtd)168 static inline void mpc5121_nfc_send_prog_page(struct mtd_info *mtd)
169 {
170 nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK);
171 nfc_write(mtd, NFC_CONFIG2, NFC_INPUT);
172 mpc5121_nfc_done(mtd);
173 }
174
175 /* Receive data from NAND flash */
mpc5121_nfc_send_read_page(struct mtd_info * mtd)176 static inline void mpc5121_nfc_send_read_page(struct mtd_info *mtd)
177 {
178 nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK);
179 nfc_write(mtd, NFC_CONFIG2, NFC_OUTPUT);
180 mpc5121_nfc_done(mtd);
181 }
182
183 /* Receive ID from NAND flash */
mpc5121_nfc_send_read_id(struct mtd_info * mtd)184 static inline void mpc5121_nfc_send_read_id(struct mtd_info *mtd)
185 {
186 nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK);
187 nfc_write(mtd, NFC_CONFIG2, NFC_ID);
188 mpc5121_nfc_done(mtd);
189 }
190
191 /* Receive status from NAND flash */
mpc5121_nfc_send_read_status(struct mtd_info * mtd)192 static inline void mpc5121_nfc_send_read_status(struct mtd_info *mtd)
193 {
194 nfc_clear(mtd, NFC_BUF_ADDR, NFC_RBA_MASK);
195 nfc_write(mtd, NFC_CONFIG2, NFC_STATUS);
196 mpc5121_nfc_done(mtd);
197 }
198
199 /* NFC interrupt handler */
mpc5121_nfc_irq(int irq,void * data)200 static irqreturn_t mpc5121_nfc_irq(int irq, void *data)
201 {
202 struct mtd_info *mtd = data;
203 struct nand_chip *chip = mtd_to_nand(mtd);
204 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip);
205
206 nfc_set(mtd, NFC_CONFIG1, NFC_INT_MASK);
207 wake_up(&prv->irq_waitq);
208
209 return IRQ_HANDLED;
210 }
211
212 /* Wait for operation complete */
mpc5121_nfc_done(struct mtd_info * mtd)213 static void mpc5121_nfc_done(struct mtd_info *mtd)
214 {
215 struct nand_chip *chip = mtd_to_nand(mtd);
216 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip);
217 int rv;
218
219 if ((nfc_read(mtd, NFC_CONFIG2) & NFC_INT) == 0) {
220 nfc_clear(mtd, NFC_CONFIG1, NFC_INT_MASK);
221 rv = wait_event_timeout(prv->irq_waitq,
222 (nfc_read(mtd, NFC_CONFIG2) & NFC_INT), NFC_TIMEOUT);
223
224 if (!rv)
225 dev_warn(prv->dev,
226 "Timeout while waiting for interrupt.\n");
227 }
228
229 nfc_clear(mtd, NFC_CONFIG2, NFC_INT);
230 }
231
232 /* Do address cycle(s) */
mpc5121_nfc_addr_cycle(struct mtd_info * mtd,int column,int page)233 static void mpc5121_nfc_addr_cycle(struct mtd_info *mtd, int column, int page)
234 {
235 struct nand_chip *chip = mtd_to_nand(mtd);
236 u32 pagemask = chip->pagemask;
237
238 if (column != -1) {
239 mpc5121_nfc_send_addr(mtd, column);
240 if (mtd->writesize > 512)
241 mpc5121_nfc_send_addr(mtd, column >> 8);
242 }
243
244 if (page != -1) {
245 do {
246 mpc5121_nfc_send_addr(mtd, page & 0xFF);
247 page >>= 8;
248 pagemask >>= 8;
249 } while (pagemask);
250 }
251 }
252
253 /* Control chip select signals */
mpc5121_nfc_select_chip(struct nand_chip * nand,int chip)254 static void mpc5121_nfc_select_chip(struct nand_chip *nand, int chip)
255 {
256 struct mtd_info *mtd = nand_to_mtd(nand);
257
258 if (chip < 0) {
259 nfc_clear(mtd, NFC_CONFIG1, NFC_CE);
260 return;
261 }
262
263 nfc_clear(mtd, NFC_BUF_ADDR, NFC_ACTIVE_CS_MASK);
264 nfc_set(mtd, NFC_BUF_ADDR, (chip << NFC_ACTIVE_CS_SHIFT) &
265 NFC_ACTIVE_CS_MASK);
266 nfc_set(mtd, NFC_CONFIG1, NFC_CE);
267 }
268
269 /* Init external chip select logic on ADS5121 board */
ads5121_chipselect_init(struct mtd_info * mtd)270 static int ads5121_chipselect_init(struct mtd_info *mtd)
271 {
272 struct nand_chip *chip = mtd_to_nand(mtd);
273 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip);
274 struct device_node *dn;
275
276 dn = of_find_compatible_node(NULL, NULL, "fsl,mpc5121ads-cpld");
277 if (dn) {
278 prv->csreg = of_iomap(dn, 0);
279 of_node_put(dn);
280 if (!prv->csreg)
281 return -ENOMEM;
282
283 /* CPLD Register 9 controls NAND /CE Lines */
284 prv->csreg += 9;
285 return 0;
286 }
287
288 return -EINVAL;
289 }
290
291 /* Control chips select signal on ADS5121 board */
ads5121_select_chip(struct nand_chip * nand,int chip)292 static void ads5121_select_chip(struct nand_chip *nand, int chip)
293 {
294 struct mpc5121_nfc_prv *prv = nand_get_controller_data(nand);
295 u8 v;
296
297 v = in_8(prv->csreg);
298 v |= 0x0F;
299
300 if (chip >= 0) {
301 mpc5121_nfc_select_chip(nand, 0);
302 v &= ~(1 << chip);
303 } else
304 mpc5121_nfc_select_chip(nand, -1);
305
306 out_8(prv->csreg, v);
307 }
308
309 /* Read NAND Ready/Busy signal */
mpc5121_nfc_dev_ready(struct nand_chip * nand)310 static int mpc5121_nfc_dev_ready(struct nand_chip *nand)
311 {
312 /*
313 * NFC handles ready/busy signal internally. Therefore, this function
314 * always returns status as ready.
315 */
316 return 1;
317 }
318
319 /* Write command to NAND flash */
mpc5121_nfc_command(struct nand_chip * chip,unsigned command,int column,int page)320 static void mpc5121_nfc_command(struct nand_chip *chip, unsigned command,
321 int column, int page)
322 {
323 struct mtd_info *mtd = nand_to_mtd(chip);
324 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip);
325
326 prv->column = (column >= 0) ? column : 0;
327 prv->spareonly = 0;
328
329 switch (command) {
330 case NAND_CMD_PAGEPROG:
331 mpc5121_nfc_send_prog_page(mtd);
332 break;
333 /*
334 * NFC does not support sub-page reads and writes,
335 * so emulate them using full page transfers.
336 */
337 case NAND_CMD_READ0:
338 column = 0;
339 break;
340
341 case NAND_CMD_READ1:
342 prv->column += 256;
343 command = NAND_CMD_READ0;
344 column = 0;
345 break;
346
347 case NAND_CMD_READOOB:
348 prv->spareonly = 1;
349 command = NAND_CMD_READ0;
350 column = 0;
351 break;
352
353 case NAND_CMD_SEQIN:
354 mpc5121_nfc_command(chip, NAND_CMD_READ0, column, page);
355 column = 0;
356 break;
357
358 case NAND_CMD_ERASE1:
359 case NAND_CMD_ERASE2:
360 case NAND_CMD_READID:
361 case NAND_CMD_STATUS:
362 break;
363
364 default:
365 return;
366 }
367
368 mpc5121_nfc_send_cmd(mtd, command);
369 mpc5121_nfc_addr_cycle(mtd, column, page);
370
371 switch (command) {
372 case NAND_CMD_READ0:
373 if (mtd->writesize > 512)
374 mpc5121_nfc_send_cmd(mtd, NAND_CMD_READSTART);
375 mpc5121_nfc_send_read_page(mtd);
376 break;
377
378 case NAND_CMD_READID:
379 mpc5121_nfc_send_read_id(mtd);
380 break;
381
382 case NAND_CMD_STATUS:
383 mpc5121_nfc_send_read_status(mtd);
384 if (chip->options & NAND_BUSWIDTH_16)
385 prv->column = 1;
386 else
387 prv->column = 0;
388 break;
389 }
390 }
391
392 /* Copy data from/to NFC spare buffers. */
mpc5121_nfc_copy_spare(struct mtd_info * mtd,uint offset,u8 * buffer,uint size,int wr)393 static void mpc5121_nfc_copy_spare(struct mtd_info *mtd, uint offset,
394 u8 *buffer, uint size, int wr)
395 {
396 struct nand_chip *nand = mtd_to_nand(mtd);
397 struct mpc5121_nfc_prv *prv = nand_get_controller_data(nand);
398 uint o, s, sbsize, blksize;
399
400 /*
401 * NAND spare area is available through NFC spare buffers.
402 * The NFC divides spare area into (page_size / 512) chunks.
403 * Each chunk is placed into separate spare memory area, using
404 * first (spare_size / num_of_chunks) bytes of the buffer.
405 *
406 * For NAND device in which the spare area is not divided fully
407 * by the number of chunks, number of used bytes in each spare
408 * buffer is rounded down to the nearest even number of bytes,
409 * and all remaining bytes are added to the last used spare area.
410 *
411 * For more information read section 26.6.10 of MPC5121e
412 * Microcontroller Reference Manual, Rev. 3.
413 */
414
415 /* Calculate number of valid bytes in each spare buffer */
416 sbsize = (mtd->oobsize / (mtd->writesize / 512)) & ~1;
417
418 while (size) {
419 /* Calculate spare buffer number */
420 s = offset / sbsize;
421 if (s > NFC_SPARE_BUFFERS - 1)
422 s = NFC_SPARE_BUFFERS - 1;
423
424 /*
425 * Calculate offset to requested data block in selected spare
426 * buffer and its size.
427 */
428 o = offset - (s * sbsize);
429 blksize = min(sbsize - o, size);
430
431 if (wr)
432 memcpy_toio(prv->regs + NFC_SPARE_AREA(s) + o,
433 buffer, blksize);
434 else
435 memcpy_fromio(buffer,
436 prv->regs + NFC_SPARE_AREA(s) + o, blksize);
437
438 buffer += blksize;
439 offset += blksize;
440 size -= blksize;
441 }
442 }
443
444 /* Copy data from/to NFC main and spare buffers */
mpc5121_nfc_buf_copy(struct mtd_info * mtd,u_char * buf,int len,int wr)445 static void mpc5121_nfc_buf_copy(struct mtd_info *mtd, u_char *buf, int len,
446 int wr)
447 {
448 struct nand_chip *chip = mtd_to_nand(mtd);
449 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip);
450 uint c = prv->column;
451 uint l;
452
453 /* Handle spare area access */
454 if (prv->spareonly || c >= mtd->writesize) {
455 /* Calculate offset from beginning of spare area */
456 if (c >= mtd->writesize)
457 c -= mtd->writesize;
458
459 prv->column += len;
460 mpc5121_nfc_copy_spare(mtd, c, buf, len, wr);
461 return;
462 }
463
464 /*
465 * Handle main area access - limit copy length to prevent
466 * crossing main/spare boundary.
467 */
468 l = min((uint)len, mtd->writesize - c);
469 prv->column += l;
470
471 if (wr)
472 memcpy_toio(prv->regs + NFC_MAIN_AREA(0) + c, buf, l);
473 else
474 memcpy_fromio(buf, prv->regs + NFC_MAIN_AREA(0) + c, l);
475
476 /* Handle crossing main/spare boundary */
477 if (l != len) {
478 buf += l;
479 len -= l;
480 mpc5121_nfc_buf_copy(mtd, buf, len, wr);
481 }
482 }
483
484 /* Read data from NFC buffers */
mpc5121_nfc_read_buf(struct nand_chip * chip,u_char * buf,int len)485 static void mpc5121_nfc_read_buf(struct nand_chip *chip, u_char *buf, int len)
486 {
487 mpc5121_nfc_buf_copy(nand_to_mtd(chip), buf, len, 0);
488 }
489
490 /* Write data to NFC buffers */
mpc5121_nfc_write_buf(struct nand_chip * chip,const u_char * buf,int len)491 static void mpc5121_nfc_write_buf(struct nand_chip *chip, const u_char *buf,
492 int len)
493 {
494 mpc5121_nfc_buf_copy(nand_to_mtd(chip), (u_char *)buf, len, 1);
495 }
496
497 /* Read byte from NFC buffers */
mpc5121_nfc_read_byte(struct nand_chip * chip)498 static u8 mpc5121_nfc_read_byte(struct nand_chip *chip)
499 {
500 u8 tmp;
501
502 mpc5121_nfc_read_buf(chip, &tmp, sizeof(tmp));
503
504 return tmp;
505 }
506
507 /*
508 * Read NFC configuration from Reset Config Word
509 *
510 * NFC is configured during reset in basis of information stored
511 * in Reset Config Word. There is no other way to set NAND block
512 * size, spare size and bus width.
513 */
mpc5121_nfc_read_hw_config(struct mtd_info * mtd)514 static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd)
515 {
516 struct nand_chip *chip = mtd_to_nand(mtd);
517 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip);
518 struct mpc512x_reset_module *rm;
519 struct device_node *rmnode;
520 uint rcw_pagesize = 0;
521 uint rcw_sparesize = 0;
522 uint rcw_width;
523 uint rcwh;
524 uint romloc, ps;
525 int ret = 0;
526
527 rmnode = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-reset");
528 if (!rmnode) {
529 dev_err(prv->dev, "Missing 'fsl,mpc5121-reset' "
530 "node in device tree!\n");
531 return -ENODEV;
532 }
533
534 rm = of_iomap(rmnode, 0);
535 if (!rm) {
536 dev_err(prv->dev, "Error mapping reset module node!\n");
537 ret = -EBUSY;
538 goto out;
539 }
540
541 rcwh = in_be32(&rm->rcwhr);
542
543 /* Bit 6: NFC bus width */
544 rcw_width = ((rcwh >> 6) & 0x1) ? 2 : 1;
545
546 /* Bit 7: NFC Page/Spare size */
547 ps = (rcwh >> 7) & 0x1;
548
549 /* Bits [22:21]: ROM Location */
550 romloc = (rcwh >> 21) & 0x3;
551
552 /* Decode RCW bits */
553 switch ((ps << 2) | romloc) {
554 case 0x00:
555 case 0x01:
556 rcw_pagesize = 512;
557 rcw_sparesize = 16;
558 break;
559 case 0x02:
560 case 0x03:
561 rcw_pagesize = 4096;
562 rcw_sparesize = 128;
563 break;
564 case 0x04:
565 case 0x05:
566 rcw_pagesize = 2048;
567 rcw_sparesize = 64;
568 break;
569 case 0x06:
570 case 0x07:
571 rcw_pagesize = 4096;
572 rcw_sparesize = 218;
573 break;
574 }
575
576 mtd->writesize = rcw_pagesize;
577 mtd->oobsize = rcw_sparesize;
578 if (rcw_width == 2)
579 chip->options |= NAND_BUSWIDTH_16;
580
581 dev_notice(prv->dev, "Configured for "
582 "%u-bit NAND, page size %u "
583 "with %u spare.\n",
584 rcw_width * 8, rcw_pagesize,
585 rcw_sparesize);
586 iounmap(rm);
587 out:
588 of_node_put(rmnode);
589 return ret;
590 }
591
592 /* Free driver resources */
mpc5121_nfc_free(struct device * dev,struct mtd_info * mtd)593 static void mpc5121_nfc_free(struct device *dev, struct mtd_info *mtd)
594 {
595 struct nand_chip *chip = mtd_to_nand(mtd);
596 struct mpc5121_nfc_prv *prv = nand_get_controller_data(chip);
597
598 clk_disable_unprepare(prv->clk);
599
600 if (prv->csreg)
601 iounmap(prv->csreg);
602 }
603
mpc5121_nfc_attach_chip(struct nand_chip * chip)604 static int mpc5121_nfc_attach_chip(struct nand_chip *chip)
605 {
606 if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT &&
607 chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
608 chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
609
610 return 0;
611 }
612
613 static const struct nand_controller_ops mpc5121_nfc_ops = {
614 .attach_chip = mpc5121_nfc_attach_chip,
615 };
616
mpc5121_nfc_probe(struct platform_device * op)617 static int mpc5121_nfc_probe(struct platform_device *op)
618 {
619 struct device_node *dn = op->dev.of_node;
620 struct clk *clk;
621 struct device *dev = &op->dev;
622 struct mpc5121_nfc_prv *prv;
623 struct resource res;
624 struct mtd_info *mtd;
625 struct nand_chip *chip;
626 unsigned long regs_paddr, regs_size;
627 const __be32 *chips_no;
628 int resettime = 0;
629 int retval = 0;
630 int rev, len;
631
632 /*
633 * Check SoC revision. This driver supports only NFC
634 * in MPC5121 revision 2 and MPC5123 revision 3.
635 */
636 rev = (mfspr(SPRN_SVR) >> 4) & 0xF;
637 if ((rev != 2) && (rev != 3)) {
638 dev_err(dev, "SoC revision %u is not supported!\n", rev);
639 return -ENXIO;
640 }
641
642 prv = devm_kzalloc(dev, sizeof(*prv), GFP_KERNEL);
643 if (!prv)
644 return -ENOMEM;
645
646 chip = &prv->chip;
647 mtd = nand_to_mtd(chip);
648
649 nand_controller_init(&prv->controller);
650 prv->controller.ops = &mpc5121_nfc_ops;
651 chip->controller = &prv->controller;
652
653 mtd->dev.parent = dev;
654 nand_set_controller_data(chip, prv);
655 nand_set_flash_node(chip, dn);
656 prv->dev = dev;
657
658 /* Read NFC configuration from Reset Config Word */
659 retval = mpc5121_nfc_read_hw_config(mtd);
660 if (retval) {
661 dev_err(dev, "Unable to read NFC config!\n");
662 return retval;
663 }
664
665 prv->irq = irq_of_parse_and_map(dn, 0);
666 if (prv->irq == NO_IRQ) {
667 dev_err(dev, "Error mapping IRQ!\n");
668 return -EINVAL;
669 }
670
671 retval = of_address_to_resource(dn, 0, &res);
672 if (retval) {
673 dev_err(dev, "Error parsing memory region!\n");
674 return retval;
675 }
676
677 chips_no = of_get_property(dn, "chips", &len);
678 if (!chips_no || len != sizeof(*chips_no)) {
679 dev_err(dev, "Invalid/missing 'chips' property!\n");
680 return -EINVAL;
681 }
682
683 regs_paddr = res.start;
684 regs_size = resource_size(&res);
685
686 if (!devm_request_mem_region(dev, regs_paddr, regs_size, DRV_NAME)) {
687 dev_err(dev, "Error requesting memory region!\n");
688 return -EBUSY;
689 }
690
691 prv->regs = devm_ioremap(dev, regs_paddr, regs_size);
692 if (!prv->regs) {
693 dev_err(dev, "Error mapping memory region!\n");
694 return -ENOMEM;
695 }
696
697 mtd->name = "MPC5121 NAND";
698 chip->legacy.dev_ready = mpc5121_nfc_dev_ready;
699 chip->legacy.cmdfunc = mpc5121_nfc_command;
700 chip->legacy.read_byte = mpc5121_nfc_read_byte;
701 chip->legacy.read_buf = mpc5121_nfc_read_buf;
702 chip->legacy.write_buf = mpc5121_nfc_write_buf;
703 chip->legacy.select_chip = mpc5121_nfc_select_chip;
704 chip->legacy.set_features = nand_get_set_features_notsupp;
705 chip->legacy.get_features = nand_get_set_features_notsupp;
706 chip->bbt_options = NAND_BBT_USE_FLASH;
707
708 /* Support external chip-select logic on ADS5121 board */
709 if (of_machine_is_compatible("fsl,mpc5121ads")) {
710 retval = ads5121_chipselect_init(mtd);
711 if (retval) {
712 dev_err(dev, "Chipselect init error!\n");
713 return retval;
714 }
715
716 chip->legacy.select_chip = ads5121_select_chip;
717 }
718
719 /* Enable NFC clock */
720 clk = devm_clk_get(dev, "ipg");
721 if (IS_ERR(clk)) {
722 dev_err(dev, "Unable to acquire NFC clock!\n");
723 retval = PTR_ERR(clk);
724 goto error;
725 }
726 retval = clk_prepare_enable(clk);
727 if (retval) {
728 dev_err(dev, "Unable to enable NFC clock!\n");
729 goto error;
730 }
731 prv->clk = clk;
732
733 /* Reset NAND Flash controller */
734 nfc_set(mtd, NFC_CONFIG1, NFC_RESET);
735 while (nfc_read(mtd, NFC_CONFIG1) & NFC_RESET) {
736 if (resettime++ >= NFC_RESET_TIMEOUT) {
737 dev_err(dev, "Timeout while resetting NFC!\n");
738 retval = -EINVAL;
739 goto error;
740 }
741
742 udelay(1);
743 }
744
745 /* Enable write to NFC memory */
746 nfc_write(mtd, NFC_CONFIG, NFC_BLS_UNLOCKED);
747
748 /* Enable write to all NAND pages */
749 nfc_write(mtd, NFC_UNLOCKSTART_BLK0, 0x0000);
750 nfc_write(mtd, NFC_UNLOCKEND_BLK0, 0xFFFF);
751 nfc_write(mtd, NFC_WRPROT, NFC_WPC_UNLOCK);
752
753 /*
754 * Setup NFC:
755 * - Big Endian transfers,
756 * - Interrupt after full page read/write.
757 */
758 nfc_write(mtd, NFC_CONFIG1, NFC_BIG_ENDIAN | NFC_INT_MASK |
759 NFC_FULL_PAGE_INT);
760
761 /* Set spare area size */
762 nfc_write(mtd, NFC_SPAS, mtd->oobsize >> 1);
763
764 init_waitqueue_head(&prv->irq_waitq);
765 retval = devm_request_irq(dev, prv->irq, &mpc5121_nfc_irq, 0, DRV_NAME,
766 mtd);
767 if (retval) {
768 dev_err(dev, "Error requesting IRQ!\n");
769 goto error;
770 }
771
772 /*
773 * This driver assumes that the default ECC engine should be TYPE_SOFT.
774 * Set ->engine_type before registering the NAND devices in order to
775 * provide a driver specific default value.
776 */
777 chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
778
779 /* Detect NAND chips */
780 retval = nand_scan(chip, be32_to_cpup(chips_no));
781 if (retval) {
782 dev_err(dev, "NAND Flash not found !\n");
783 goto error;
784 }
785
786 /* Set erase block size */
787 switch (mtd->erasesize / mtd->writesize) {
788 case 32:
789 nfc_set(mtd, NFC_CONFIG1, NFC_PPB_32);
790 break;
791
792 case 64:
793 nfc_set(mtd, NFC_CONFIG1, NFC_PPB_64);
794 break;
795
796 case 128:
797 nfc_set(mtd, NFC_CONFIG1, NFC_PPB_128);
798 break;
799
800 case 256:
801 nfc_set(mtd, NFC_CONFIG1, NFC_PPB_256);
802 break;
803
804 default:
805 dev_err(dev, "Unsupported NAND flash!\n");
806 retval = -ENXIO;
807 goto error;
808 }
809
810 dev_set_drvdata(dev, mtd);
811
812 /* Register device in MTD */
813 retval = mtd_device_register(mtd, NULL, 0);
814 if (retval) {
815 dev_err(dev, "Error adding MTD device!\n");
816 goto error;
817 }
818
819 return 0;
820 error:
821 mpc5121_nfc_free(dev, mtd);
822 return retval;
823 }
824
mpc5121_nfc_remove(struct platform_device * op)825 static int mpc5121_nfc_remove(struct platform_device *op)
826 {
827 struct device *dev = &op->dev;
828 struct mtd_info *mtd = dev_get_drvdata(dev);
829 int ret;
830
831 ret = mtd_device_unregister(mtd);
832 WARN_ON(ret);
833 nand_cleanup(mtd_to_nand(mtd));
834 mpc5121_nfc_free(dev, mtd);
835
836 return 0;
837 }
838
839 static const struct of_device_id mpc5121_nfc_match[] = {
840 { .compatible = "fsl,mpc5121-nfc", },
841 {},
842 };
843 MODULE_DEVICE_TABLE(of, mpc5121_nfc_match);
844
845 static struct platform_driver mpc5121_nfc_driver = {
846 .probe = mpc5121_nfc_probe,
847 .remove = mpc5121_nfc_remove,
848 .driver = {
849 .name = DRV_NAME,
850 .of_match_table = mpc5121_nfc_match,
851 },
852 };
853
854 module_platform_driver(mpc5121_nfc_driver);
855
856 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
857 MODULE_DESCRIPTION("MPC5121 NAND MTD driver");
858 MODULE_LICENSE("GPL");
859
