1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2009-2015 Freescale Semiconductor, Inc. and others
4 *
5 * Description: MPC5125, VF610, MCF54418 and Kinetis K70 Nand driver.
6 * Jason ported to M54418TWR and MVFA5 (VF610).
7 * Authors: Stefan Agner <stefan.agner@toradex.com>
8 * Bill Pringlemeir <bpringlemeir@nbsps.com>
9 * Shaohui Xie <b21989@freescale.com>
10 * Jason Jin <Jason.jin@freescale.com>
11 *
12 * Based on original driver mpc5121_nfc.c.
13 *
14 * Limitations:
15 * - Untested on MPC5125 and M54418.
16 * - DMA and pipelining not used.
17 * - 2K pages or less.
18 * - HW ECC: Only 2K page with 64+ OOB.
19 * - HW ECC: Only 24 and 32-bit error correction implemented.
20 */
21
22 #include <linux/module.h>
23 #include <linux/bitops.h>
24 #include <linux/clk.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/interrupt.h>
28 #include <linux/io.h>
29 #include <linux/mtd/mtd.h>
30 #include <linux/mtd/rawnand.h>
31 #include <linux/mtd/partitions.h>
32 #include <linux/of_device.h>
33 #include <linux/platform_device.h>
34 #include <linux/slab.h>
35 #include <linux/swab.h>
36
37 #define DRV_NAME "vf610_nfc"
38
39 /* Register Offsets */
40 #define NFC_FLASH_CMD1 0x3F00
41 #define NFC_FLASH_CMD2 0x3F04
42 #define NFC_COL_ADDR 0x3F08
43 #define NFC_ROW_ADDR 0x3F0c
44 #define NFC_ROW_ADDR_INC 0x3F14
45 #define NFC_FLASH_STATUS1 0x3F18
46 #define NFC_FLASH_STATUS2 0x3F1c
47 #define NFC_CACHE_SWAP 0x3F28
48 #define NFC_SECTOR_SIZE 0x3F2c
49 #define NFC_FLASH_CONFIG 0x3F30
50 #define NFC_IRQ_STATUS 0x3F38
51
52 /* Addresses for NFC MAIN RAM BUFFER areas */
53 #define NFC_MAIN_AREA(n) ((n) * 0x1000)
54
55 #define PAGE_2K 0x0800
56 #define OOB_64 0x0040
57 #define OOB_MAX 0x0100
58
59 /* NFC_CMD2[CODE] controller cycle bit masks */
60 #define COMMAND_CMD_BYTE1 BIT(14)
61 #define COMMAND_CAR_BYTE1 BIT(13)
62 #define COMMAND_CAR_BYTE2 BIT(12)
63 #define COMMAND_RAR_BYTE1 BIT(11)
64 #define COMMAND_RAR_BYTE2 BIT(10)
65 #define COMMAND_RAR_BYTE3 BIT(9)
66 #define COMMAND_NADDR_BYTES(x) GENMASK(13, 13 - (x) + 1)
67 #define COMMAND_WRITE_DATA BIT(8)
68 #define COMMAND_CMD_BYTE2 BIT(7)
69 #define COMMAND_RB_HANDSHAKE BIT(6)
70 #define COMMAND_READ_DATA BIT(5)
71 #define COMMAND_CMD_BYTE3 BIT(4)
72 #define COMMAND_READ_STATUS BIT(3)
73 #define COMMAND_READ_ID BIT(2)
74
75 /* NFC ECC mode define */
76 #define ECC_BYPASS 0
77 #define ECC_45_BYTE 6
78 #define ECC_60_BYTE 7
79
80 /*** Register Mask and bit definitions */
81
82 /* NFC_FLASH_CMD1 Field */
83 #define CMD_BYTE2_MASK 0xFF000000
84 #define CMD_BYTE2_SHIFT 24
85
86 /* NFC_FLASH_CM2 Field */
87 #define CMD_BYTE1_MASK 0xFF000000
88 #define CMD_BYTE1_SHIFT 24
89 #define CMD_CODE_MASK 0x00FFFF00
90 #define CMD_CODE_SHIFT 8
91 #define BUFNO_MASK 0x00000006
92 #define BUFNO_SHIFT 1
93 #define START_BIT BIT(0)
94
95 /* NFC_COL_ADDR Field */
96 #define COL_ADDR_MASK 0x0000FFFF
97 #define COL_ADDR_SHIFT 0
98 #define COL_ADDR(pos, val) (((val) & 0xFF) << (8 * (pos)))
99
100 /* NFC_ROW_ADDR Field */
101 #define ROW_ADDR_MASK 0x00FFFFFF
102 #define ROW_ADDR_SHIFT 0
103 #define ROW_ADDR(pos, val) (((val) & 0xFF) << (8 * (pos)))
104
105 #define ROW_ADDR_CHIP_SEL_RB_MASK 0xF0000000
106 #define ROW_ADDR_CHIP_SEL_RB_SHIFT 28
107 #define ROW_ADDR_CHIP_SEL_MASK 0x0F000000
108 #define ROW_ADDR_CHIP_SEL_SHIFT 24
109
110 /* NFC_FLASH_STATUS2 Field */
111 #define STATUS_BYTE1_MASK 0x000000FF
112
113 /* NFC_FLASH_CONFIG Field */
114 #define CONFIG_ECC_SRAM_ADDR_MASK 0x7FC00000
115 #define CONFIG_ECC_SRAM_ADDR_SHIFT 22
116 #define CONFIG_ECC_SRAM_REQ_BIT BIT(21)
117 #define CONFIG_DMA_REQ_BIT BIT(20)
118 #define CONFIG_ECC_MODE_MASK 0x000E0000
119 #define CONFIG_ECC_MODE_SHIFT 17
120 #define CONFIG_FAST_FLASH_BIT BIT(16)
121 #define CONFIG_16BIT BIT(7)
122 #define CONFIG_BOOT_MODE_BIT BIT(6)
123 #define CONFIG_ADDR_AUTO_INCR_BIT BIT(5)
124 #define CONFIG_BUFNO_AUTO_INCR_BIT BIT(4)
125 #define CONFIG_PAGE_CNT_MASK 0xF
126 #define CONFIG_PAGE_CNT_SHIFT 0
127
128 /* NFC_IRQ_STATUS Field */
129 #define IDLE_IRQ_BIT BIT(29)
130 #define IDLE_EN_BIT BIT(20)
131 #define CMD_DONE_CLEAR_BIT BIT(18)
132 #define IDLE_CLEAR_BIT BIT(17)
133
134 /*
135 * ECC status - seems to consume 8 bytes (double word). The documented
136 * status byte is located in the lowest byte of the second word (which is
137 * the 4th or 7th byte depending on endianness).
138 * Calculate an offset to store the ECC status at the end of the buffer.
139 */
140 #define ECC_SRAM_ADDR (PAGE_2K + OOB_MAX - 8)
141
142 #define ECC_STATUS 0x4
143 #define ECC_STATUS_MASK 0x80
144 #define ECC_STATUS_ERR_COUNT 0x3F
145
146 enum vf610_nfc_variant {
147 NFC_VFC610 = 1,
148 };
149
150 struct vf610_nfc {
151 struct nand_controller base;
152 struct nand_chip chip;
153 struct device *dev;
154 void __iomem *regs;
155 struct completion cmd_done;
156 /* Status and ID are in alternate locations. */
157 enum vf610_nfc_variant variant;
158 struct clk *clk;
159 /*
160 * Indicate that user data is accessed (full page/oob). This is
161 * useful to indicate the driver whether to swap byte endianness.
162 * See comments in vf610_nfc_rd_from_sram/vf610_nfc_wr_to_sram.
163 */
164 bool data_access;
165 u32 ecc_mode;
166 };
167
chip_to_nfc(struct nand_chip * chip)168 static inline struct vf610_nfc *chip_to_nfc(struct nand_chip *chip)
169 {
170 return container_of(chip, struct vf610_nfc, chip);
171 }
172
vf610_nfc_read(struct vf610_nfc * nfc,uint reg)173 static inline u32 vf610_nfc_read(struct vf610_nfc *nfc, uint reg)
174 {
175 return readl(nfc->regs + reg);
176 }
177
vf610_nfc_write(struct vf610_nfc * nfc,uint reg,u32 val)178 static inline void vf610_nfc_write(struct vf610_nfc *nfc, uint reg, u32 val)
179 {
180 writel(val, nfc->regs + reg);
181 }
182
vf610_nfc_set(struct vf610_nfc * nfc,uint reg,u32 bits)183 static inline void vf610_nfc_set(struct vf610_nfc *nfc, uint reg, u32 bits)
184 {
185 vf610_nfc_write(nfc, reg, vf610_nfc_read(nfc, reg) | bits);
186 }
187
vf610_nfc_clear(struct vf610_nfc * nfc,uint reg,u32 bits)188 static inline void vf610_nfc_clear(struct vf610_nfc *nfc, uint reg, u32 bits)
189 {
190 vf610_nfc_write(nfc, reg, vf610_nfc_read(nfc, reg) & ~bits);
191 }
192
vf610_nfc_set_field(struct vf610_nfc * nfc,u32 reg,u32 mask,u32 shift,u32 val)193 static inline void vf610_nfc_set_field(struct vf610_nfc *nfc, u32 reg,
194 u32 mask, u32 shift, u32 val)
195 {
196 vf610_nfc_write(nfc, reg,
197 (vf610_nfc_read(nfc, reg) & (~mask)) | val << shift);
198 }
199
vf610_nfc_kernel_is_little_endian(void)200 static inline bool vf610_nfc_kernel_is_little_endian(void)
201 {
202 #ifdef __LITTLE_ENDIAN
203 return true;
204 #else
205 return false;
206 #endif
207 }
208
209 /*
210 * Read accessor for internal SRAM buffer
211 * @dst: destination address in regular memory
212 * @src: source address in SRAM buffer
213 * @len: bytes to copy
214 * @fix_endian: Fix endianness if required
215 *
216 * Use this accessor for the internal SRAM buffers. On the ARM
217 * Freescale Vybrid SoC it's known that the driver can treat
218 * the SRAM buffer as if it's memory. Other platform might need
219 * to treat the buffers differently.
220 *
221 * The controller stores bytes from the NAND chip internally in big
222 * endianness. On little endian platforms such as Vybrid this leads
223 * to reversed byte order.
224 * For performance reason (and earlier probably due to unawareness)
225 * the driver avoids correcting endianness where it has control over
226 * write and read side (e.g. page wise data access).
227 */
vf610_nfc_rd_from_sram(void * dst,const void __iomem * src,size_t len,bool fix_endian)228 static inline void vf610_nfc_rd_from_sram(void *dst, const void __iomem *src,
229 size_t len, bool fix_endian)
230 {
231 if (vf610_nfc_kernel_is_little_endian() && fix_endian) {
232 unsigned int i;
233
234 for (i = 0; i < len; i += 4) {
235 u32 val = swab32(__raw_readl(src + i));
236
237 memcpy(dst + i, &val, min(sizeof(val), len - i));
238 }
239 } else {
240 memcpy_fromio(dst, src, len);
241 }
242 }
243
244 /*
245 * Write accessor for internal SRAM buffer
246 * @dst: destination address in SRAM buffer
247 * @src: source address in regular memory
248 * @len: bytes to copy
249 * @fix_endian: Fix endianness if required
250 *
251 * Use this accessor for the internal SRAM buffers. On the ARM
252 * Freescale Vybrid SoC it's known that the driver can treat
253 * the SRAM buffer as if it's memory. Other platform might need
254 * to treat the buffers differently.
255 *
256 * The controller stores bytes from the NAND chip internally in big
257 * endianness. On little endian platforms such as Vybrid this leads
258 * to reversed byte order.
259 * For performance reason (and earlier probably due to unawareness)
260 * the driver avoids correcting endianness where it has control over
261 * write and read side (e.g. page wise data access).
262 */
vf610_nfc_wr_to_sram(void __iomem * dst,const void * src,size_t len,bool fix_endian)263 static inline void vf610_nfc_wr_to_sram(void __iomem *dst, const void *src,
264 size_t len, bool fix_endian)
265 {
266 if (vf610_nfc_kernel_is_little_endian() && fix_endian) {
267 unsigned int i;
268
269 for (i = 0; i < len; i += 4) {
270 u32 val;
271
272 memcpy(&val, src + i, min(sizeof(val), len - i));
273 __raw_writel(swab32(val), dst + i);
274 }
275 } else {
276 memcpy_toio(dst, src, len);
277 }
278 }
279
280 /* Clear flags for upcoming command */
vf610_nfc_clear_status(struct vf610_nfc * nfc)281 static inline void vf610_nfc_clear_status(struct vf610_nfc *nfc)
282 {
283 u32 tmp = vf610_nfc_read(nfc, NFC_IRQ_STATUS);
284
285 tmp |= CMD_DONE_CLEAR_BIT | IDLE_CLEAR_BIT;
286 vf610_nfc_write(nfc, NFC_IRQ_STATUS, tmp);
287 }
288
vf610_nfc_done(struct vf610_nfc * nfc)289 static void vf610_nfc_done(struct vf610_nfc *nfc)
290 {
291 unsigned long timeout = msecs_to_jiffies(100);
292
293 /*
294 * Barrier is needed after this write. This write need
295 * to be done before reading the next register the first
296 * time.
297 * vf610_nfc_set implicates such a barrier by using writel
298 * to write to the register.
299 */
300 vf610_nfc_set(nfc, NFC_IRQ_STATUS, IDLE_EN_BIT);
301 vf610_nfc_set(nfc, NFC_FLASH_CMD2, START_BIT);
302
303 if (!wait_for_completion_timeout(&nfc->cmd_done, timeout))
304 dev_warn(nfc->dev, "Timeout while waiting for BUSY.\n");
305
306 vf610_nfc_clear_status(nfc);
307 }
308
vf610_nfc_irq(int irq,void * data)309 static irqreturn_t vf610_nfc_irq(int irq, void *data)
310 {
311 struct vf610_nfc *nfc = data;
312
313 vf610_nfc_clear(nfc, NFC_IRQ_STATUS, IDLE_EN_BIT);
314 complete(&nfc->cmd_done);
315
316 return IRQ_HANDLED;
317 }
318
vf610_nfc_ecc_mode(struct vf610_nfc * nfc,int ecc_mode)319 static inline void vf610_nfc_ecc_mode(struct vf610_nfc *nfc, int ecc_mode)
320 {
321 vf610_nfc_set_field(nfc, NFC_FLASH_CONFIG,
322 CONFIG_ECC_MODE_MASK,
323 CONFIG_ECC_MODE_SHIFT, ecc_mode);
324 }
325
vf610_nfc_run(struct vf610_nfc * nfc,u32 col,u32 row,u32 cmd1,u32 cmd2,u32 trfr_sz)326 static inline void vf610_nfc_run(struct vf610_nfc *nfc, u32 col, u32 row,
327 u32 cmd1, u32 cmd2, u32 trfr_sz)
328 {
329 vf610_nfc_set_field(nfc, NFC_COL_ADDR, COL_ADDR_MASK,
330 COL_ADDR_SHIFT, col);
331
332 vf610_nfc_set_field(nfc, NFC_ROW_ADDR, ROW_ADDR_MASK,
333 ROW_ADDR_SHIFT, row);
334
335 vf610_nfc_write(nfc, NFC_SECTOR_SIZE, trfr_sz);
336 vf610_nfc_write(nfc, NFC_FLASH_CMD1, cmd1);
337 vf610_nfc_write(nfc, NFC_FLASH_CMD2, cmd2);
338
339 dev_dbg(nfc->dev,
340 "col 0x%04x, row 0x%08x, cmd1 0x%08x, cmd2 0x%08x, len %d\n",
341 col, row, cmd1, cmd2, trfr_sz);
342
343 vf610_nfc_done(nfc);
344 }
345
346 static inline const struct nand_op_instr *
vf610_get_next_instr(const struct nand_subop * subop,int * op_id)347 vf610_get_next_instr(const struct nand_subop *subop, int *op_id)
348 {
349 if (*op_id + 1 >= subop->ninstrs)
350 return NULL;
351
352 (*op_id)++;
353
354 return &subop->instrs[*op_id];
355 }
356
vf610_nfc_cmd(struct nand_chip * chip,const struct nand_subop * subop)357 static int vf610_nfc_cmd(struct nand_chip *chip,
358 const struct nand_subop *subop)
359 {
360 const struct nand_op_instr *instr;
361 struct vf610_nfc *nfc = chip_to_nfc(chip);
362 int op_id = -1, trfr_sz = 0, offset = 0;
363 u32 col = 0, row = 0, cmd1 = 0, cmd2 = 0, code = 0;
364 bool force8bit = false;
365
366 /*
367 * Some ops are optional, but the hardware requires the operations
368 * to be in this exact order.
369 * The op parser enforces the order and makes sure that there isn't
370 * a read and write element in a single operation.
371 */
372 instr = vf610_get_next_instr(subop, &op_id);
373 if (!instr)
374 return -EINVAL;
375
376 if (instr && instr->type == NAND_OP_CMD_INSTR) {
377 cmd2 |= instr->ctx.cmd.opcode << CMD_BYTE1_SHIFT;
378 code |= COMMAND_CMD_BYTE1;
379
380 instr = vf610_get_next_instr(subop, &op_id);
381 }
382
383 if (instr && instr->type == NAND_OP_ADDR_INSTR) {
384 int naddrs = nand_subop_get_num_addr_cyc(subop, op_id);
385 int i = nand_subop_get_addr_start_off(subop, op_id);
386
387 for (; i < naddrs; i++) {
388 u8 val = instr->ctx.addr.addrs[i];
389
390 if (i < 2)
391 col |= COL_ADDR(i, val);
392 else
393 row |= ROW_ADDR(i - 2, val);
394 }
395 code |= COMMAND_NADDR_BYTES(naddrs);
396
397 instr = vf610_get_next_instr(subop, &op_id);
398 }
399
400 if (instr && instr->type == NAND_OP_DATA_OUT_INSTR) {
401 trfr_sz = nand_subop_get_data_len(subop, op_id);
402 offset = nand_subop_get_data_start_off(subop, op_id);
403 force8bit = instr->ctx.data.force_8bit;
404
405 /*
406 * Don't fix endianness on page access for historical reasons.
407 * See comment in vf610_nfc_wr_to_sram
408 */
409 vf610_nfc_wr_to_sram(nfc->regs + NFC_MAIN_AREA(0) + offset,
410 instr->ctx.data.buf.out + offset,
411 trfr_sz, !nfc->data_access);
412 code |= COMMAND_WRITE_DATA;
413
414 instr = vf610_get_next_instr(subop, &op_id);
415 }
416
417 if (instr && instr->type == NAND_OP_CMD_INSTR) {
418 cmd1 |= instr->ctx.cmd.opcode << CMD_BYTE2_SHIFT;
419 code |= COMMAND_CMD_BYTE2;
420
421 instr = vf610_get_next_instr(subop, &op_id);
422 }
423
424 if (instr && instr->type == NAND_OP_WAITRDY_INSTR) {
425 code |= COMMAND_RB_HANDSHAKE;
426
427 instr = vf610_get_next_instr(subop, &op_id);
428 }
429
430 if (instr && instr->type == NAND_OP_DATA_IN_INSTR) {
431 trfr_sz = nand_subop_get_data_len(subop, op_id);
432 offset = nand_subop_get_data_start_off(subop, op_id);
433 force8bit = instr->ctx.data.force_8bit;
434
435 code |= COMMAND_READ_DATA;
436 }
437
438 if (force8bit && (chip->options & NAND_BUSWIDTH_16))
439 vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_16BIT);
440
441 cmd2 |= code << CMD_CODE_SHIFT;
442
443 vf610_nfc_run(nfc, col, row, cmd1, cmd2, trfr_sz);
444
445 if (instr && instr->type == NAND_OP_DATA_IN_INSTR) {
446 /*
447 * Don't fix endianness on page access for historical reasons.
448 * See comment in vf610_nfc_rd_from_sram
449 */
450 vf610_nfc_rd_from_sram(instr->ctx.data.buf.in + offset,
451 nfc->regs + NFC_MAIN_AREA(0) + offset,
452 trfr_sz, !nfc->data_access);
453 }
454
455 if (force8bit && (chip->options & NAND_BUSWIDTH_16))
456 vf610_nfc_set(nfc, NFC_FLASH_CONFIG, CONFIG_16BIT);
457
458 return 0;
459 }
460
461 static const struct nand_op_parser vf610_nfc_op_parser = NAND_OP_PARSER(
462 NAND_OP_PARSER_PATTERN(vf610_nfc_cmd,
463 NAND_OP_PARSER_PAT_CMD_ELEM(true),
464 NAND_OP_PARSER_PAT_ADDR_ELEM(true, 5),
465 NAND_OP_PARSER_PAT_DATA_OUT_ELEM(true, PAGE_2K + OOB_MAX),
466 NAND_OP_PARSER_PAT_CMD_ELEM(true),
467 NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)),
468 NAND_OP_PARSER_PATTERN(vf610_nfc_cmd,
469 NAND_OP_PARSER_PAT_CMD_ELEM(true),
470 NAND_OP_PARSER_PAT_ADDR_ELEM(true, 5),
471 NAND_OP_PARSER_PAT_CMD_ELEM(true),
472 NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
473 NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, PAGE_2K + OOB_MAX)),
474 );
475
476 /*
477 * This function supports Vybrid only (MPC5125 would have full RB and four CS)
478 */
vf610_nfc_select_target(struct nand_chip * chip,unsigned int cs)479 static void vf610_nfc_select_target(struct nand_chip *chip, unsigned int cs)
480 {
481 struct vf610_nfc *nfc = chip_to_nfc(chip);
482 u32 tmp;
483
484 /* Vybrid only (MPC5125 would have full RB and four CS) */
485 if (nfc->variant != NFC_VFC610)
486 return;
487
488 tmp = vf610_nfc_read(nfc, NFC_ROW_ADDR);
489 tmp &= ~(ROW_ADDR_CHIP_SEL_RB_MASK | ROW_ADDR_CHIP_SEL_MASK);
490 tmp |= 1 << ROW_ADDR_CHIP_SEL_RB_SHIFT;
491 tmp |= BIT(cs) << ROW_ADDR_CHIP_SEL_SHIFT;
492
493 vf610_nfc_write(nfc, NFC_ROW_ADDR, tmp);
494 }
495
vf610_nfc_exec_op(struct nand_chip * chip,const struct nand_operation * op,bool check_only)496 static int vf610_nfc_exec_op(struct nand_chip *chip,
497 const struct nand_operation *op,
498 bool check_only)
499 {
500 if (!check_only)
501 vf610_nfc_select_target(chip, op->cs);
502
503 return nand_op_parser_exec_op(chip, &vf610_nfc_op_parser, op,
504 check_only);
505 }
506
vf610_nfc_correct_data(struct nand_chip * chip,uint8_t * dat,uint8_t * oob,int page)507 static inline int vf610_nfc_correct_data(struct nand_chip *chip, uint8_t *dat,
508 uint8_t *oob, int page)
509 {
510 struct vf610_nfc *nfc = chip_to_nfc(chip);
511 struct mtd_info *mtd = nand_to_mtd(chip);
512 u32 ecc_status_off = NFC_MAIN_AREA(0) + ECC_SRAM_ADDR + ECC_STATUS;
513 u8 ecc_status;
514 u8 ecc_count;
515 int flips_threshold = nfc->chip.ecc.strength / 2;
516
517 ecc_status = vf610_nfc_read(nfc, ecc_status_off) & 0xff;
518 ecc_count = ecc_status & ECC_STATUS_ERR_COUNT;
519
520 if (!(ecc_status & ECC_STATUS_MASK))
521 return ecc_count;
522
523 nfc->data_access = true;
524 nand_read_oob_op(&nfc->chip, page, 0, oob, mtd->oobsize);
525 nfc->data_access = false;
526
527 /*
528 * On an erased page, bit count (including OOB) should be zero or
529 * at least less then half of the ECC strength.
530 */
531 return nand_check_erased_ecc_chunk(dat, nfc->chip.ecc.size, oob,
532 mtd->oobsize, NULL, 0,
533 flips_threshold);
534 }
535
vf610_nfc_fill_row(struct nand_chip * chip,int page,u32 * code,u32 * row)536 static void vf610_nfc_fill_row(struct nand_chip *chip, int page, u32 *code,
537 u32 *row)
538 {
539 *row = ROW_ADDR(0, page & 0xff) | ROW_ADDR(1, page >> 8);
540 *code |= COMMAND_RAR_BYTE1 | COMMAND_RAR_BYTE2;
541
542 if (chip->options & NAND_ROW_ADDR_3) {
543 *row |= ROW_ADDR(2, page >> 16);
544 *code |= COMMAND_RAR_BYTE3;
545 }
546 }
547
vf610_nfc_read_page(struct nand_chip * chip,uint8_t * buf,int oob_required,int page)548 static int vf610_nfc_read_page(struct nand_chip *chip, uint8_t *buf,
549 int oob_required, int page)
550 {
551 struct vf610_nfc *nfc = chip_to_nfc(chip);
552 struct mtd_info *mtd = nand_to_mtd(chip);
553 int trfr_sz = mtd->writesize + mtd->oobsize;
554 u32 row = 0, cmd1 = 0, cmd2 = 0, code = 0;
555 int stat;
556
557 vf610_nfc_select_target(chip, chip->cur_cs);
558
559 cmd2 |= NAND_CMD_READ0 << CMD_BYTE1_SHIFT;
560 code |= COMMAND_CMD_BYTE1 | COMMAND_CAR_BYTE1 | COMMAND_CAR_BYTE2;
561
562 vf610_nfc_fill_row(chip, page, &code, &row);
563
564 cmd1 |= NAND_CMD_READSTART << CMD_BYTE2_SHIFT;
565 code |= COMMAND_CMD_BYTE2 | COMMAND_RB_HANDSHAKE | COMMAND_READ_DATA;
566
567 cmd2 |= code << CMD_CODE_SHIFT;
568
569 vf610_nfc_ecc_mode(nfc, nfc->ecc_mode);
570 vf610_nfc_run(nfc, 0, row, cmd1, cmd2, trfr_sz);
571 vf610_nfc_ecc_mode(nfc, ECC_BYPASS);
572
573 /*
574 * Don't fix endianness on page access for historical reasons.
575 * See comment in vf610_nfc_rd_from_sram
576 */
577 vf610_nfc_rd_from_sram(buf, nfc->regs + NFC_MAIN_AREA(0),
578 mtd->writesize, false);
579 if (oob_required)
580 vf610_nfc_rd_from_sram(chip->oob_poi,
581 nfc->regs + NFC_MAIN_AREA(0) +
582 mtd->writesize,
583 mtd->oobsize, false);
584
585 stat = vf610_nfc_correct_data(chip, buf, chip->oob_poi, page);
586
587 if (stat < 0) {
588 mtd->ecc_stats.failed++;
589 return 0;
590 } else {
591 mtd->ecc_stats.corrected += stat;
592 return stat;
593 }
594 }
595
vf610_nfc_write_page(struct nand_chip * chip,const uint8_t * buf,int oob_required,int page)596 static int vf610_nfc_write_page(struct nand_chip *chip, const uint8_t *buf,
597 int oob_required, int page)
598 {
599 struct vf610_nfc *nfc = chip_to_nfc(chip);
600 struct mtd_info *mtd = nand_to_mtd(chip);
601 int trfr_sz = mtd->writesize + mtd->oobsize;
602 u32 row = 0, cmd1 = 0, cmd2 = 0, code = 0;
603 u8 status;
604 int ret;
605
606 vf610_nfc_select_target(chip, chip->cur_cs);
607
608 cmd2 |= NAND_CMD_SEQIN << CMD_BYTE1_SHIFT;
609 code |= COMMAND_CMD_BYTE1 | COMMAND_CAR_BYTE1 | COMMAND_CAR_BYTE2;
610
611 vf610_nfc_fill_row(chip, page, &code, &row);
612
613 cmd1 |= NAND_CMD_PAGEPROG << CMD_BYTE2_SHIFT;
614 code |= COMMAND_CMD_BYTE2 | COMMAND_WRITE_DATA;
615
616 /*
617 * Don't fix endianness on page access for historical reasons.
618 * See comment in vf610_nfc_wr_to_sram
619 */
620 vf610_nfc_wr_to_sram(nfc->regs + NFC_MAIN_AREA(0), buf,
621 mtd->writesize, false);
622
623 code |= COMMAND_RB_HANDSHAKE;
624 cmd2 |= code << CMD_CODE_SHIFT;
625
626 vf610_nfc_ecc_mode(nfc, nfc->ecc_mode);
627 vf610_nfc_run(nfc, 0, row, cmd1, cmd2, trfr_sz);
628 vf610_nfc_ecc_mode(nfc, ECC_BYPASS);
629
630 ret = nand_status_op(chip, &status);
631 if (ret)
632 return ret;
633
634 if (status & NAND_STATUS_FAIL)
635 return -EIO;
636
637 return 0;
638 }
639
vf610_nfc_read_page_raw(struct nand_chip * chip,u8 * buf,int oob_required,int page)640 static int vf610_nfc_read_page_raw(struct nand_chip *chip, u8 *buf,
641 int oob_required, int page)
642 {
643 struct vf610_nfc *nfc = chip_to_nfc(chip);
644 int ret;
645
646 nfc->data_access = true;
647 ret = nand_read_page_raw(chip, buf, oob_required, page);
648 nfc->data_access = false;
649
650 return ret;
651 }
652
vf610_nfc_write_page_raw(struct nand_chip * chip,const u8 * buf,int oob_required,int page)653 static int vf610_nfc_write_page_raw(struct nand_chip *chip, const u8 *buf,
654 int oob_required, int page)
655 {
656 struct vf610_nfc *nfc = chip_to_nfc(chip);
657 struct mtd_info *mtd = nand_to_mtd(chip);
658 int ret;
659
660 nfc->data_access = true;
661 ret = nand_prog_page_begin_op(chip, page, 0, buf, mtd->writesize);
662 if (!ret && oob_required)
663 ret = nand_write_data_op(chip, chip->oob_poi, mtd->oobsize,
664 false);
665 nfc->data_access = false;
666
667 if (ret)
668 return ret;
669
670 return nand_prog_page_end_op(chip);
671 }
672
vf610_nfc_read_oob(struct nand_chip * chip,int page)673 static int vf610_nfc_read_oob(struct nand_chip *chip, int page)
674 {
675 struct vf610_nfc *nfc = chip_to_nfc(chip);
676 int ret;
677
678 nfc->data_access = true;
679 ret = nand_read_oob_std(chip, page);
680 nfc->data_access = false;
681
682 return ret;
683 }
684
vf610_nfc_write_oob(struct nand_chip * chip,int page)685 static int vf610_nfc_write_oob(struct nand_chip *chip, int page)
686 {
687 struct mtd_info *mtd = nand_to_mtd(chip);
688 struct vf610_nfc *nfc = chip_to_nfc(chip);
689 int ret;
690
691 nfc->data_access = true;
692 ret = nand_prog_page_begin_op(chip, page, mtd->writesize,
693 chip->oob_poi, mtd->oobsize);
694 nfc->data_access = false;
695
696 if (ret)
697 return ret;
698
699 return nand_prog_page_end_op(chip);
700 }
701
702 static const struct of_device_id vf610_nfc_dt_ids[] = {
703 { .compatible = "fsl,vf610-nfc", .data = (void *)NFC_VFC610 },
704 { /* sentinel */ }
705 };
706 MODULE_DEVICE_TABLE(of, vf610_nfc_dt_ids);
707
vf610_nfc_preinit_controller(struct vf610_nfc * nfc)708 static void vf610_nfc_preinit_controller(struct vf610_nfc *nfc)
709 {
710 vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_16BIT);
711 vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_ADDR_AUTO_INCR_BIT);
712 vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_BUFNO_AUTO_INCR_BIT);
713 vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_BOOT_MODE_BIT);
714 vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_DMA_REQ_BIT);
715 vf610_nfc_set(nfc, NFC_FLASH_CONFIG, CONFIG_FAST_FLASH_BIT);
716 vf610_nfc_ecc_mode(nfc, ECC_BYPASS);
717
718 /* Disable virtual pages, only one elementary transfer unit */
719 vf610_nfc_set_field(nfc, NFC_FLASH_CONFIG, CONFIG_PAGE_CNT_MASK,
720 CONFIG_PAGE_CNT_SHIFT, 1);
721 }
722
vf610_nfc_init_controller(struct vf610_nfc * nfc)723 static void vf610_nfc_init_controller(struct vf610_nfc *nfc)
724 {
725 if (nfc->chip.options & NAND_BUSWIDTH_16)
726 vf610_nfc_set(nfc, NFC_FLASH_CONFIG, CONFIG_16BIT);
727 else
728 vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_16BIT);
729
730 if (nfc->chip.ecc.engine_type == NAND_ECC_ENGINE_TYPE_ON_HOST) {
731 /* Set ECC status offset in SRAM */
732 vf610_nfc_set_field(nfc, NFC_FLASH_CONFIG,
733 CONFIG_ECC_SRAM_ADDR_MASK,
734 CONFIG_ECC_SRAM_ADDR_SHIFT,
735 ECC_SRAM_ADDR >> 3);
736
737 /* Enable ECC status in SRAM */
738 vf610_nfc_set(nfc, NFC_FLASH_CONFIG, CONFIG_ECC_SRAM_REQ_BIT);
739 }
740 }
741
vf610_nfc_attach_chip(struct nand_chip * chip)742 static int vf610_nfc_attach_chip(struct nand_chip *chip)
743 {
744 struct mtd_info *mtd = nand_to_mtd(chip);
745 struct vf610_nfc *nfc = chip_to_nfc(chip);
746
747 vf610_nfc_init_controller(nfc);
748
749 /* Bad block options. */
750 if (chip->bbt_options & NAND_BBT_USE_FLASH)
751 chip->bbt_options |= NAND_BBT_NO_OOB;
752
753 /* Single buffer only, max 256 OOB minus ECC status */
754 if (mtd->writesize + mtd->oobsize > PAGE_2K + OOB_MAX - 8) {
755 dev_err(nfc->dev, "Unsupported flash page size\n");
756 return -ENXIO;
757 }
758
759 if (chip->ecc.engine_type != NAND_ECC_ENGINE_TYPE_ON_HOST)
760 return 0;
761
762 if (mtd->writesize != PAGE_2K && mtd->oobsize < 64) {
763 dev_err(nfc->dev, "Unsupported flash with hwecc\n");
764 return -ENXIO;
765 }
766
767 if (chip->ecc.size != mtd->writesize) {
768 dev_err(nfc->dev, "Step size needs to be page size\n");
769 return -ENXIO;
770 }
771
772 /* Only 64 byte ECC layouts known */
773 if (mtd->oobsize > 64)
774 mtd->oobsize = 64;
775
776 /* Use default large page ECC layout defined in NAND core */
777 mtd_set_ooblayout(mtd, nand_get_large_page_ooblayout());
778 if (chip->ecc.strength == 32) {
779 nfc->ecc_mode = ECC_60_BYTE;
780 chip->ecc.bytes = 60;
781 } else if (chip->ecc.strength == 24) {
782 nfc->ecc_mode = ECC_45_BYTE;
783 chip->ecc.bytes = 45;
784 } else {
785 dev_err(nfc->dev, "Unsupported ECC strength\n");
786 return -ENXIO;
787 }
788
789 chip->ecc.read_page = vf610_nfc_read_page;
790 chip->ecc.write_page = vf610_nfc_write_page;
791 chip->ecc.read_page_raw = vf610_nfc_read_page_raw;
792 chip->ecc.write_page_raw = vf610_nfc_write_page_raw;
793 chip->ecc.read_oob = vf610_nfc_read_oob;
794 chip->ecc.write_oob = vf610_nfc_write_oob;
795
796 chip->ecc.size = PAGE_2K;
797
798 return 0;
799 }
800
801 static const struct nand_controller_ops vf610_nfc_controller_ops = {
802 .attach_chip = vf610_nfc_attach_chip,
803 .exec_op = vf610_nfc_exec_op,
804
805 };
806
vf610_nfc_probe(struct platform_device * pdev)807 static int vf610_nfc_probe(struct platform_device *pdev)
808 {
809 struct vf610_nfc *nfc;
810 struct mtd_info *mtd;
811 struct nand_chip *chip;
812 struct device_node *child;
813 const struct of_device_id *of_id;
814 int err;
815 int irq;
816
817 nfc = devm_kzalloc(&pdev->dev, sizeof(*nfc), GFP_KERNEL);
818 if (!nfc)
819 return -ENOMEM;
820
821 nfc->dev = &pdev->dev;
822 chip = &nfc->chip;
823 mtd = nand_to_mtd(chip);
824
825 mtd->owner = THIS_MODULE;
826 mtd->dev.parent = nfc->dev;
827 mtd->name = DRV_NAME;
828
829 irq = platform_get_irq(pdev, 0);
830 if (irq < 0)
831 return irq;
832
833 nfc->regs = devm_platform_ioremap_resource(pdev, 0);
834 if (IS_ERR(nfc->regs))
835 return PTR_ERR(nfc->regs);
836
837 nfc->clk = devm_clk_get_enabled(&pdev->dev, NULL);
838 if (IS_ERR(nfc->clk)) {
839 dev_err(nfc->dev, "Unable to get and enable clock!\n");
840 return PTR_ERR(nfc->clk);
841 }
842
843 of_id = of_match_device(vf610_nfc_dt_ids, &pdev->dev);
844 if (!of_id)
845 return -ENODEV;
846
847 nfc->variant = (uintptr_t)of_id->data;
848
849 for_each_available_child_of_node(nfc->dev->of_node, child) {
850 if (of_device_is_compatible(child, "fsl,vf610-nfc-nandcs")) {
851
852 if (nand_get_flash_node(chip)) {
853 dev_err(nfc->dev,
854 "Only one NAND chip supported!\n");
855 of_node_put(child);
856 return -EINVAL;
857 }
858
859 nand_set_flash_node(chip, child);
860 }
861 }
862
863 if (!nand_get_flash_node(chip)) {
864 dev_err(nfc->dev, "NAND chip sub-node missing!\n");
865 return -ENODEV;
866 }
867
868 chip->options |= NAND_NO_SUBPAGE_WRITE;
869
870 init_completion(&nfc->cmd_done);
871
872 err = devm_request_irq(nfc->dev, irq, vf610_nfc_irq, 0, DRV_NAME, nfc);
873 if (err) {
874 dev_err(nfc->dev, "Error requesting IRQ!\n");
875 return err;
876 }
877
878 vf610_nfc_preinit_controller(nfc);
879
880 nand_controller_init(&nfc->base);
881 nfc->base.ops = &vf610_nfc_controller_ops;
882 chip->controller = &nfc->base;
883
884 /* Scan the NAND chip */
885 err = nand_scan(chip, 1);
886 if (err)
887 return err;
888
889 platform_set_drvdata(pdev, nfc);
890
891 /* Register device in MTD */
892 err = mtd_device_register(mtd, NULL, 0);
893 if (err)
894 goto err_cleanup_nand;
895 return 0;
896
897 err_cleanup_nand:
898 nand_cleanup(chip);
899 return err;
900 }
901
vf610_nfc_remove(struct platform_device * pdev)902 static void vf610_nfc_remove(struct platform_device *pdev)
903 {
904 struct vf610_nfc *nfc = platform_get_drvdata(pdev);
905 struct nand_chip *chip = &nfc->chip;
906 int ret;
907
908 ret = mtd_device_unregister(nand_to_mtd(chip));
909 WARN_ON(ret);
910 nand_cleanup(chip);
911 }
912
913 #ifdef CONFIG_PM_SLEEP
vf610_nfc_suspend(struct device * dev)914 static int vf610_nfc_suspend(struct device *dev)
915 {
916 struct vf610_nfc *nfc = dev_get_drvdata(dev);
917
918 clk_disable_unprepare(nfc->clk);
919 return 0;
920 }
921
vf610_nfc_resume(struct device * dev)922 static int vf610_nfc_resume(struct device *dev)
923 {
924 struct vf610_nfc *nfc = dev_get_drvdata(dev);
925 int err;
926
927 err = clk_prepare_enable(nfc->clk);
928 if (err)
929 return err;
930
931 vf610_nfc_preinit_controller(nfc);
932 vf610_nfc_init_controller(nfc);
933 return 0;
934 }
935 #endif
936
937 static SIMPLE_DEV_PM_OPS(vf610_nfc_pm_ops, vf610_nfc_suspend, vf610_nfc_resume);
938
939 static struct platform_driver vf610_nfc_driver = {
940 .driver = {
941 .name = DRV_NAME,
942 .of_match_table = vf610_nfc_dt_ids,
943 .pm = &vf610_nfc_pm_ops,
944 },
945 .probe = vf610_nfc_probe,
946 .remove_new = vf610_nfc_remove,
947 };
948
949 module_platform_driver(vf610_nfc_driver);
950
951 MODULE_AUTHOR("Stefan Agner <stefan.agner@toradex.com>");
952 MODULE_DESCRIPTION("Freescale VF610/MPC5125 NFC MTD NAND driver");
953 MODULE_LICENSE("GPL");
954