1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2005, Intec Automation Inc.
4 * Copyright (C) 2014, Freescale Semiconductor, Inc.
5 */
6
7#include <linux/bitfield.h>
8#include <linux/mtd/spi-nor.h>
9#include <linux/slab.h>
10#include <linux/sort.h>
11
12#include "core.h"
13
14#define SFDP_PARAM_HEADER_ID(p) (((p)->id_msb << 8) | (p)->id_lsb)
15#define SFDP_PARAM_HEADER_PTP(p) \
16 (((p)->parameter_table_pointer[2] << 16) | \
17 ((p)->parameter_table_pointer[1] << 8) | \
18 ((p)->parameter_table_pointer[0] << 0))
19#define SFDP_PARAM_HEADER_PARAM_LEN(p) ((p)->length * 4)
20
21#define SFDP_BFPT_ID 0xff00 /* Basic Flash Parameter Table */
22#define SFDP_SECTOR_MAP_ID 0xff81 /* Sector Map Table */
23#define SFDP_4BAIT_ID 0xff84 /* 4-byte Address Instruction Table */
24#define SFDP_PROFILE1_ID 0xff05 /* xSPI Profile 1.0 table. */
25#define SFDP_SCCR_MAP_ID 0xff87 /*
26 * Status, Control and Configuration
27 * Register Map.
28 */
29#define SFDP_SCCR_MAP_MC_ID 0xff88 /*
30 * Status, Control and Configuration
31 * Register Map Offsets for Multi-Chip
32 * SPI Memory Devices.
33 */
34
35#define SFDP_SIGNATURE 0x50444653U
36
37struct sfdp_header {
38 u32 signature; /* Ox50444653U <=> "SFDP" */
39 u8 minor;
40 u8 major;
41 u8 nph; /* 0-base number of parameter headers */
42 u8 unused;
43
44 /* Basic Flash Parameter Table. */
45 struct sfdp_parameter_header bfpt_header;
46};
47
48/* Fast Read settings. */
49struct sfdp_bfpt_read {
50 /* The Fast Read x-y-z hardware capability in params->hwcaps.mask. */
51 u32 hwcaps;
52
53 /*
54 * The <supported_bit> bit in <supported_dword> BFPT DWORD tells us
55 * whether the Fast Read x-y-z command is supported.
56 */
57 u32 supported_dword;
58 u32 supported_bit;
59
60 /*
61 * The half-word at offset <setting_shift> in <setting_dword> BFPT DWORD
62 * encodes the op code, the number of mode clocks and the number of wait
63 * states to be used by Fast Read x-y-z command.
64 */
65 u32 settings_dword;
66 u32 settings_shift;
67
68 /* The SPI protocol for this Fast Read x-y-z command. */
69 enum spi_nor_protocol proto;
70};
71
72struct sfdp_bfpt_erase {
73 /*
74 * The half-word at offset <shift> in DWORD <dword> encodes the
75 * op code and erase sector size to be used by Sector Erase commands.
76 */
77 u32 dword;
78 u32 shift;
79};
80
81#define SMPT_CMD_ADDRESS_LEN_MASK GENMASK(23, 22)
82#define SMPT_CMD_ADDRESS_LEN_0 (0x0UL << 22)
83#define SMPT_CMD_ADDRESS_LEN_3 (0x1UL << 22)
84#define SMPT_CMD_ADDRESS_LEN_4 (0x2UL << 22)
85#define SMPT_CMD_ADDRESS_LEN_USE_CURRENT (0x3UL << 22)
86
87#define SMPT_CMD_READ_DUMMY_MASK GENMASK(19, 16)
88#define SMPT_CMD_READ_DUMMY_SHIFT 16
89#define SMPT_CMD_READ_DUMMY(_cmd) \
90 (((_cmd) & SMPT_CMD_READ_DUMMY_MASK) >> SMPT_CMD_READ_DUMMY_SHIFT)
91#define SMPT_CMD_READ_DUMMY_IS_VARIABLE 0xfUL
92
93#define SMPT_CMD_READ_DATA_MASK GENMASK(31, 24)
94#define SMPT_CMD_READ_DATA_SHIFT 24
95#define SMPT_CMD_READ_DATA(_cmd) \
96 (((_cmd) & SMPT_CMD_READ_DATA_MASK) >> SMPT_CMD_READ_DATA_SHIFT)
97
98#define SMPT_CMD_OPCODE_MASK GENMASK(15, 8)
99#define SMPT_CMD_OPCODE_SHIFT 8
100#define SMPT_CMD_OPCODE(_cmd) \
101 (((_cmd) & SMPT_CMD_OPCODE_MASK) >> SMPT_CMD_OPCODE_SHIFT)
102
103#define SMPT_MAP_REGION_COUNT_MASK GENMASK(23, 16)
104#define SMPT_MAP_REGION_COUNT_SHIFT 16
105#define SMPT_MAP_REGION_COUNT(_header) \
106 ((((_header) & SMPT_MAP_REGION_COUNT_MASK) >> \
107 SMPT_MAP_REGION_COUNT_SHIFT) + 1)
108
109#define SMPT_MAP_ID_MASK GENMASK(15, 8)
110#define SMPT_MAP_ID_SHIFT 8
111#define SMPT_MAP_ID(_header) \
112 (((_header) & SMPT_MAP_ID_MASK) >> SMPT_MAP_ID_SHIFT)
113
114#define SMPT_MAP_REGION_SIZE_MASK GENMASK(31, 8)
115#define SMPT_MAP_REGION_SIZE_SHIFT 8
116#define SMPT_MAP_REGION_SIZE(_region) \
117 (((((_region) & SMPT_MAP_REGION_SIZE_MASK) >> \
118 SMPT_MAP_REGION_SIZE_SHIFT) + 1) * 256)
119
120#define SMPT_MAP_REGION_ERASE_TYPE_MASK GENMASK(3, 0)
121#define SMPT_MAP_REGION_ERASE_TYPE(_region) \
122 ((_region) & SMPT_MAP_REGION_ERASE_TYPE_MASK)
123
124#define SMPT_DESC_TYPE_MAP BIT(1)
125#define SMPT_DESC_END BIT(0)
126
127#define SFDP_4BAIT_DWORD_MAX 2
128
129struct sfdp_4bait {
130 /* The hardware capability. */
131 u32 hwcaps;
132
133 /*
134 * The <supported_bit> bit in DWORD1 of the 4BAIT tells us whether
135 * the associated 4-byte address op code is supported.
136 */
137 u32 supported_bit;
138};
139
140/**
141 * spi_nor_read_raw() - raw read of serial flash memory. read_opcode,
142 * addr_nbytes and read_dummy members of the struct spi_nor
143 * should be previously set.
144 * @nor: pointer to a 'struct spi_nor'
145 * @addr: offset in the serial flash memory
146 * @len: number of bytes to read
147 * @buf: buffer where the data is copied into (dma-safe memory)
148 *
149 * Return: 0 on success, -errno otherwise.
150 */
151static int spi_nor_read_raw(struct spi_nor *nor, u32 addr, size_t len, u8 *buf)
152{
153 ssize_t ret;
154
155 while (len) {
156 ret = spi_nor_read_data(nor, from: addr, len, buf);
157 if (ret < 0)
158 return ret;
159 if (!ret || ret > len)
160 return -EIO;
161
162 buf += ret;
163 addr += ret;
164 len -= ret;
165 }
166 return 0;
167}
168
169/**
170 * spi_nor_read_sfdp() - read Serial Flash Discoverable Parameters.
171 * @nor: pointer to a 'struct spi_nor'
172 * @addr: offset in the SFDP area to start reading data from
173 * @len: number of bytes to read
174 * @buf: buffer where the SFDP data are copied into (dma-safe memory)
175 *
176 * Whatever the actual numbers of bytes for address and dummy cycles are
177 * for (Fast) Read commands, the Read SFDP (5Ah) instruction is always
178 * followed by a 3-byte address and 8 dummy clock cycles.
179 *
180 * Return: 0 on success, -errno otherwise.
181 */
182static int spi_nor_read_sfdp(struct spi_nor *nor, u32 addr,
183 size_t len, void *buf)
184{
185 u8 addr_nbytes, read_opcode, read_dummy;
186 int ret;
187
188 read_opcode = nor->read_opcode;
189 addr_nbytes = nor->addr_nbytes;
190 read_dummy = nor->read_dummy;
191
192 nor->read_opcode = SPINOR_OP_RDSFDP;
193 nor->addr_nbytes = 3;
194 nor->read_dummy = 8;
195
196 ret = spi_nor_read_raw(nor, addr, len, buf);
197
198 nor->read_opcode = read_opcode;
199 nor->addr_nbytes = addr_nbytes;
200 nor->read_dummy = read_dummy;
201
202 return ret;
203}
204
205/**
206 * spi_nor_read_sfdp_dma_unsafe() - read Serial Flash Discoverable Parameters.
207 * @nor: pointer to a 'struct spi_nor'
208 * @addr: offset in the SFDP area to start reading data from
209 * @len: number of bytes to read
210 * @buf: buffer where the SFDP data are copied into
211 *
212 * Wrap spi_nor_read_sfdp() using a kmalloc'ed bounce buffer as @buf is now not
213 * guaranteed to be dma-safe.
214 *
215 * Return: -ENOMEM if kmalloc() fails, the return code of spi_nor_read_sfdp()
216 * otherwise.
217 */
218static int spi_nor_read_sfdp_dma_unsafe(struct spi_nor *nor, u32 addr,
219 size_t len, void *buf)
220{
221 void *dma_safe_buf;
222 int ret;
223
224 dma_safe_buf = kmalloc(size: len, GFP_KERNEL);
225 if (!dma_safe_buf)
226 return -ENOMEM;
227
228 ret = spi_nor_read_sfdp(nor, addr, len, buf: dma_safe_buf);
229 memcpy(buf, dma_safe_buf, len);
230 kfree(objp: dma_safe_buf);
231
232 return ret;
233}
234
235static void
236spi_nor_set_read_settings_from_bfpt(struct spi_nor_read_command *read,
237 u16 half,
238 enum spi_nor_protocol proto)
239{
240 read->num_mode_clocks = (half >> 5) & 0x07;
241 read->num_wait_states = (half >> 0) & 0x1f;
242 read->opcode = (half >> 8) & 0xff;
243 read->proto = proto;
244}
245
246static const struct sfdp_bfpt_read sfdp_bfpt_reads[] = {
247 /* Fast Read 1-1-2 */
248 {
249 SNOR_HWCAPS_READ_1_1_2,
250 SFDP_DWORD(1), BIT(16), /* Supported bit */
251 SFDP_DWORD(4), 0, /* Settings */
252 SNOR_PROTO_1_1_2,
253 },
254
255 /* Fast Read 1-2-2 */
256 {
257 SNOR_HWCAPS_READ_1_2_2,
258 SFDP_DWORD(1), BIT(20), /* Supported bit */
259 SFDP_DWORD(4), 16, /* Settings */
260 SNOR_PROTO_1_2_2,
261 },
262
263 /* Fast Read 2-2-2 */
264 {
265 SNOR_HWCAPS_READ_2_2_2,
266 SFDP_DWORD(5), BIT(0), /* Supported bit */
267 SFDP_DWORD(6), 16, /* Settings */
268 SNOR_PROTO_2_2_2,
269 },
270
271 /* Fast Read 1-1-4 */
272 {
273 SNOR_HWCAPS_READ_1_1_4,
274 SFDP_DWORD(1), BIT(22), /* Supported bit */
275 SFDP_DWORD(3), 16, /* Settings */
276 SNOR_PROTO_1_1_4,
277 },
278
279 /* Fast Read 1-4-4 */
280 {
281 SNOR_HWCAPS_READ_1_4_4,
282 SFDP_DWORD(1), BIT(21), /* Supported bit */
283 SFDP_DWORD(3), 0, /* Settings */
284 SNOR_PROTO_1_4_4,
285 },
286
287 /* Fast Read 4-4-4 */
288 {
289 SNOR_HWCAPS_READ_4_4_4,
290 SFDP_DWORD(5), BIT(4), /* Supported bit */
291 SFDP_DWORD(7), 16, /* Settings */
292 SNOR_PROTO_4_4_4,
293 },
294};
295
296static const struct sfdp_bfpt_erase sfdp_bfpt_erases[] = {
297 /* Erase Type 1 in DWORD8 bits[15:0] */
298 {SFDP_DWORD(8), 0},
299
300 /* Erase Type 2 in DWORD8 bits[31:16] */
301 {SFDP_DWORD(8), 16},
302
303 /* Erase Type 3 in DWORD9 bits[15:0] */
304 {SFDP_DWORD(9), 0},
305
306 /* Erase Type 4 in DWORD9 bits[31:16] */
307 {SFDP_DWORD(9), 16},
308};
309
310/**
311 * spi_nor_set_erase_settings_from_bfpt() - set erase type settings from BFPT
312 * @erase: pointer to a structure that describes a SPI NOR erase type
313 * @size: the size of the sector/block erased by the erase type
314 * @opcode: the SPI command op code to erase the sector/block
315 * @i: erase type index as sorted in the Basic Flash Parameter Table
316 *
317 * The supported Erase Types will be sorted at init in ascending order, with
318 * the smallest Erase Type size being the first member in the erase_type array
319 * of the spi_nor_erase_map structure. Save the Erase Type index as sorted in
320 * the Basic Flash Parameter Table since it will be used later on to
321 * synchronize with the supported Erase Types defined in SFDP optional tables.
322 */
323static void
324spi_nor_set_erase_settings_from_bfpt(struct spi_nor_erase_type *erase,
325 u32 size, u8 opcode, u8 i)
326{
327 erase->idx = i;
328 spi_nor_set_erase_type(erase, size, opcode);
329}
330
331/**
332 * spi_nor_map_cmp_erase_type() - compare the map's erase types by size
333 * @l: member in the left half of the map's erase_type array
334 * @r: member in the right half of the map's erase_type array
335 *
336 * Comparison function used in the sort() call to sort in ascending order the
337 * map's erase types, the smallest erase type size being the first member in the
338 * sorted erase_type array.
339 *
340 * Return: the result of @l->size - @r->size
341 */
342static int spi_nor_map_cmp_erase_type(const void *l, const void *r)
343{
344 const struct spi_nor_erase_type *left = l, *right = r;
345
346 return left->size - right->size;
347}
348
349/**
350 * spi_nor_sort_erase_mask() - sort erase mask
351 * @map: the erase map of the SPI NOR
352 * @erase_mask: the erase type mask to be sorted
353 *
354 * Replicate the sort done for the map's erase types in BFPT: sort the erase
355 * mask in ascending order with the smallest erase type size starting from
356 * BIT(0) in the sorted erase mask.
357 *
358 * Return: sorted erase mask.
359 */
360static u8 spi_nor_sort_erase_mask(struct spi_nor_erase_map *map, u8 erase_mask)
361{
362 struct spi_nor_erase_type *erase_type = map->erase_type;
363 int i;
364 u8 sorted_erase_mask = 0;
365
366 if (!erase_mask)
367 return 0;
368
369 /* Replicate the sort done for the map's erase types. */
370 for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++)
371 if (erase_type[i].size && erase_mask & BIT(erase_type[i].idx))
372 sorted_erase_mask |= BIT(i);
373
374 return sorted_erase_mask;
375}
376
377/**
378 * spi_nor_regions_sort_erase_types() - sort erase types in each region
379 * @map: the erase map of the SPI NOR
380 *
381 * Function assumes that the erase types defined in the erase map are already
382 * sorted in ascending order, with the smallest erase type size being the first
383 * member in the erase_type array. It replicates the sort done for the map's
384 * erase types. Each region's erase bitmask will indicate which erase types are
385 * supported from the sorted erase types defined in the erase map.
386 * Sort the all region's erase type at init in order to speed up the process of
387 * finding the best erase command at runtime.
388 */
389static void spi_nor_regions_sort_erase_types(struct spi_nor_erase_map *map)
390{
391 struct spi_nor_erase_region *region = map->regions;
392 u8 sorted_erase_mask;
393 unsigned int i;
394
395 for (i = 0; i < map->n_regions; i++) {
396 sorted_erase_mask =
397 spi_nor_sort_erase_mask(map, erase_mask: region[i].erase_mask);
398
399 /* Overwrite erase mask. */
400 region[i].erase_mask = sorted_erase_mask;
401 }
402}
403
404/**
405 * spi_nor_parse_bfpt() - read and parse the Basic Flash Parameter Table.
406 * @nor: pointer to a 'struct spi_nor'
407 * @bfpt_header: pointer to the 'struct sfdp_parameter_header' describing
408 * the Basic Flash Parameter Table length and version
409 *
410 * The Basic Flash Parameter Table is the main and only mandatory table as
411 * defined by the SFDP (JESD216) specification.
412 * It provides us with the total size (memory density) of the data array and
413 * the number of address bytes for Fast Read, Page Program and Sector Erase
414 * commands.
415 * For Fast READ commands, it also gives the number of mode clock cycles and
416 * wait states (regrouped in the number of dummy clock cycles) for each
417 * supported instruction op code.
418 * For Page Program, the page size is now available since JESD216 rev A, however
419 * the supported instruction op codes are still not provided.
420 * For Sector Erase commands, this table stores the supported instruction op
421 * codes and the associated sector sizes.
422 * Finally, the Quad Enable Requirements (QER) are also available since JESD216
423 * rev A. The QER bits encode the manufacturer dependent procedure to be
424 * executed to set the Quad Enable (QE) bit in some internal register of the
425 * Quad SPI memory. Indeed the QE bit, when it exists, must be set before
426 * sending any Quad SPI command to the memory. Actually, setting the QE bit
427 * tells the memory to reassign its WP# and HOLD#/RESET# pins to functions IO2
428 * and IO3 hence enabling 4 (Quad) I/O lines.
429 *
430 * Return: 0 on success, -errno otherwise.
431 */
432static int spi_nor_parse_bfpt(struct spi_nor *nor,
433 const struct sfdp_parameter_header *bfpt_header)
434{
435 struct spi_nor_flash_parameter *params = nor->params;
436 struct spi_nor_erase_map *map = &params->erase_map;
437 struct spi_nor_erase_type *erase_type = map->erase_type;
438 struct sfdp_bfpt bfpt;
439 size_t len;
440 int i, cmd, err;
441 u32 addr, val;
442 u32 dword;
443 u16 half;
444 u8 erase_mask;
445 u8 wait_states, mode_clocks, opcode;
446
447 /* JESD216 Basic Flash Parameter Table length is at least 9 DWORDs. */
448 if (bfpt_header->length < BFPT_DWORD_MAX_JESD216)
449 return -EINVAL;
450
451 /* Read the Basic Flash Parameter Table. */
452 len = min_t(size_t, sizeof(bfpt),
453 bfpt_header->length * sizeof(u32));
454 addr = SFDP_PARAM_HEADER_PTP(bfpt_header);
455 memset(&bfpt, 0, sizeof(bfpt));
456 err = spi_nor_read_sfdp_dma_unsafe(nor, addr, len, buf: &bfpt);
457 if (err < 0)
458 return err;
459
460 /* Fix endianness of the BFPT DWORDs. */
461 le32_to_cpu_array(buf: bfpt.dwords, BFPT_DWORD_MAX);
462
463 /* Number of address bytes. */
464 switch (bfpt.dwords[SFDP_DWORD(1)] & BFPT_DWORD1_ADDRESS_BYTES_MASK) {
465 case BFPT_DWORD1_ADDRESS_BYTES_3_ONLY:
466 case BFPT_DWORD1_ADDRESS_BYTES_3_OR_4:
467 params->addr_nbytes = 3;
468 params->addr_mode_nbytes = 3;
469 break;
470
471 case BFPT_DWORD1_ADDRESS_BYTES_4_ONLY:
472 params->addr_nbytes = 4;
473 params->addr_mode_nbytes = 4;
474 break;
475
476 default:
477 break;
478 }
479
480 /* Flash Memory Density (in bits). */
481 val = bfpt.dwords[SFDP_DWORD(2)];
482 if (val & BIT(31)) {
483 val &= ~BIT(31);
484
485 /*
486 * Prevent overflows on params->size. Anyway, a NOR of 2^64
487 * bits is unlikely to exist so this error probably means
488 * the BFPT we are reading is corrupted/wrong.
489 */
490 if (val > 63)
491 return -EINVAL;
492
493 params->size = 1ULL << val;
494 } else {
495 params->size = val + 1;
496 }
497 params->size >>= 3; /* Convert to bytes. */
498
499 /* Fast Read settings. */
500 for (i = 0; i < ARRAY_SIZE(sfdp_bfpt_reads); i++) {
501 const struct sfdp_bfpt_read *rd = &sfdp_bfpt_reads[i];
502 struct spi_nor_read_command *read;
503
504 if (!(bfpt.dwords[rd->supported_dword] & rd->supported_bit)) {
505 params->hwcaps.mask &= ~rd->hwcaps;
506 continue;
507 }
508
509 params->hwcaps.mask |= rd->hwcaps;
510 cmd = spi_nor_hwcaps_read2cmd(hwcaps: rd->hwcaps);
511 read = &params->reads[cmd];
512 half = bfpt.dwords[rd->settings_dword] >> rd->settings_shift;
513 spi_nor_set_read_settings_from_bfpt(read, half, proto: rd->proto);
514 }
515
516 /*
517 * Sector Erase settings. Reinitialize the uniform erase map using the
518 * Erase Types defined in the bfpt table.
519 */
520 erase_mask = 0;
521 memset(&params->erase_map, 0, sizeof(params->erase_map));
522 for (i = 0; i < ARRAY_SIZE(sfdp_bfpt_erases); i++) {
523 const struct sfdp_bfpt_erase *er = &sfdp_bfpt_erases[i];
524 u32 erasesize;
525 u8 opcode;
526
527 half = bfpt.dwords[er->dword] >> er->shift;
528 erasesize = half & 0xff;
529
530 /* erasesize == 0 means this Erase Type is not supported. */
531 if (!erasesize)
532 continue;
533
534 erasesize = 1U << erasesize;
535 opcode = (half >> 8) & 0xff;
536 erase_mask |= BIT(i);
537 spi_nor_set_erase_settings_from_bfpt(erase: &erase_type[i], size: erasesize,
538 opcode, i);
539 }
540 spi_nor_init_uniform_erase_map(map, erase_mask, flash_size: params->size);
541 /*
542 * Sort all the map's Erase Types in ascending order with the smallest
543 * erase size being the first member in the erase_type array.
544 */
545 sort(base: erase_type, SNOR_ERASE_TYPE_MAX, size: sizeof(erase_type[0]),
546 cmp_func: spi_nor_map_cmp_erase_type, NULL);
547 /*
548 * Sort the erase types in the uniform region in order to update the
549 * uniform_erase_type bitmask. The bitmask will be used later on when
550 * selecting the uniform erase.
551 */
552 spi_nor_regions_sort_erase_types(map);
553
554 /* Stop here if not JESD216 rev A or later. */
555 if (bfpt_header->length == BFPT_DWORD_MAX_JESD216)
556 return spi_nor_post_bfpt_fixups(nor, bfpt_header, bfpt: &bfpt);
557
558 /* Page size: this field specifies 'N' so the page size = 2^N bytes. */
559 val = bfpt.dwords[SFDP_DWORD(11)];
560 val &= BFPT_DWORD11_PAGE_SIZE_MASK;
561 val >>= BFPT_DWORD11_PAGE_SIZE_SHIFT;
562 params->page_size = 1U << val;
563
564 /* Quad Enable Requirements. */
565 switch (bfpt.dwords[SFDP_DWORD(15)] & BFPT_DWORD15_QER_MASK) {
566 case BFPT_DWORD15_QER_NONE:
567 params->quad_enable = NULL;
568 break;
569
570 case BFPT_DWORD15_QER_SR2_BIT1_BUGGY:
571 /*
572 * Writing only one byte to the Status Register has the
573 * side-effect of clearing Status Register 2.
574 */
575 case BFPT_DWORD15_QER_SR2_BIT1_NO_RD:
576 /*
577 * Read Configuration Register (35h) instruction is not
578 * supported.
579 */
580 nor->flags |= SNOR_F_HAS_16BIT_SR | SNOR_F_NO_READ_CR;
581 params->quad_enable = spi_nor_sr2_bit1_quad_enable;
582 break;
583
584 case BFPT_DWORD15_QER_SR1_BIT6:
585 nor->flags &= ~SNOR_F_HAS_16BIT_SR;
586 params->quad_enable = spi_nor_sr1_bit6_quad_enable;
587 break;
588
589 case BFPT_DWORD15_QER_SR2_BIT7:
590 nor->flags &= ~SNOR_F_HAS_16BIT_SR;
591 params->quad_enable = spi_nor_sr2_bit7_quad_enable;
592 break;
593
594 case BFPT_DWORD15_QER_SR2_BIT1:
595 /*
596 * JESD216 rev B or later does not specify if writing only one
597 * byte to the Status Register clears or not the Status
598 * Register 2, so let's be cautious and keep the default
599 * assumption of a 16-bit Write Status (01h) command.
600 */
601 nor->flags |= SNOR_F_HAS_16BIT_SR;
602
603 params->quad_enable = spi_nor_sr2_bit1_quad_enable;
604 break;
605
606 default:
607 dev_dbg(nor->dev, "BFPT QER reserved value used\n");
608 break;
609 }
610
611 dword = bfpt.dwords[SFDP_DWORD(16)] & BFPT_DWORD16_4B_ADDR_MODE_MASK;
612 if (SFDP_MASK_CHECK(dword, BFPT_DWORD16_4B_ADDR_MODE_BRWR))
613 params->set_4byte_addr_mode = spi_nor_set_4byte_addr_mode_brwr;
614 else if (SFDP_MASK_CHECK(dword, BFPT_DWORD16_4B_ADDR_MODE_WREN_EN4B_EX4B))
615 params->set_4byte_addr_mode = spi_nor_set_4byte_addr_mode_wren_en4b_ex4b;
616 else if (SFDP_MASK_CHECK(dword, BFPT_DWORD16_4B_ADDR_MODE_EN4B_EX4B))
617 params->set_4byte_addr_mode = spi_nor_set_4byte_addr_mode_en4b_ex4b;
618 else
619 dev_dbg(nor->dev, "BFPT: 4-Byte Address Mode method is not recognized or not implemented\n");
620
621 /* Soft Reset support. */
622 if (bfpt.dwords[SFDP_DWORD(16)] & BFPT_DWORD16_SWRST_EN_RST)
623 nor->flags |= SNOR_F_SOFT_RESET;
624
625 /* Stop here if not JESD216 rev C or later. */
626 if (bfpt_header->length == BFPT_DWORD_MAX_JESD216B)
627 return spi_nor_post_bfpt_fixups(nor, bfpt_header, bfpt: &bfpt);
628
629 /* Parse 1-1-8 read instruction */
630 opcode = FIELD_GET(BFPT_DWORD17_RD_1_1_8_CMD, bfpt.dwords[SFDP_DWORD(17)]);
631 if (opcode) {
632 mode_clocks = FIELD_GET(BFPT_DWORD17_RD_1_1_8_MODE_CLOCKS,
633 bfpt.dwords[SFDP_DWORD(17)]);
634 wait_states = FIELD_GET(BFPT_DWORD17_RD_1_1_8_WAIT_STATES,
635 bfpt.dwords[SFDP_DWORD(17)]);
636 params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_8;
637 spi_nor_set_read_settings(read: &params->reads[SNOR_CMD_READ_1_1_8],
638 num_mode_clocks: mode_clocks, num_wait_states: wait_states, opcode,
639 proto: SNOR_PROTO_1_1_8);
640 }
641
642 /* Parse 1-8-8 read instruction */
643 opcode = FIELD_GET(BFPT_DWORD17_RD_1_8_8_CMD, bfpt.dwords[SFDP_DWORD(17)]);
644 if (opcode) {
645 mode_clocks = FIELD_GET(BFPT_DWORD17_RD_1_8_8_MODE_CLOCKS,
646 bfpt.dwords[SFDP_DWORD(17)]);
647 wait_states = FIELD_GET(BFPT_DWORD17_RD_1_8_8_WAIT_STATES,
648 bfpt.dwords[SFDP_DWORD(17)]);
649 params->hwcaps.mask |= SNOR_HWCAPS_READ_1_8_8;
650 spi_nor_set_read_settings(read: &params->reads[SNOR_CMD_READ_1_8_8],
651 num_mode_clocks: mode_clocks, num_wait_states: wait_states, opcode,
652 proto: SNOR_PROTO_1_8_8);
653 }
654
655 /* 8D-8D-8D command extension. */
656 switch (bfpt.dwords[SFDP_DWORD(18)] & BFPT_DWORD18_CMD_EXT_MASK) {
657 case BFPT_DWORD18_CMD_EXT_REP:
658 nor->cmd_ext_type = SPI_NOR_EXT_REPEAT;
659 break;
660
661 case BFPT_DWORD18_CMD_EXT_INV:
662 nor->cmd_ext_type = SPI_NOR_EXT_INVERT;
663 break;
664
665 case BFPT_DWORD18_CMD_EXT_RES:
666 dev_dbg(nor->dev, "Reserved command extension used\n");
667 break;
668
669 case BFPT_DWORD18_CMD_EXT_16B:
670 dev_dbg(nor->dev, "16-bit opcodes not supported\n");
671 return -EOPNOTSUPP;
672 }
673
674 return spi_nor_post_bfpt_fixups(nor, bfpt_header, bfpt: &bfpt);
675}
676
677/**
678 * spi_nor_smpt_addr_nbytes() - return the number of address bytes used in the
679 * configuration detection command.
680 * @nor: pointer to a 'struct spi_nor'
681 * @settings: configuration detection command descriptor, dword1
682 */
683static u8 spi_nor_smpt_addr_nbytes(const struct spi_nor *nor, const u32 settings)
684{
685 switch (settings & SMPT_CMD_ADDRESS_LEN_MASK) {
686 case SMPT_CMD_ADDRESS_LEN_0:
687 return 0;
688 case SMPT_CMD_ADDRESS_LEN_3:
689 return 3;
690 case SMPT_CMD_ADDRESS_LEN_4:
691 return 4;
692 case SMPT_CMD_ADDRESS_LEN_USE_CURRENT:
693 default:
694 return nor->params->addr_mode_nbytes;
695 }
696}
697
698/**
699 * spi_nor_smpt_read_dummy() - return the configuration detection command read
700 * latency, in clock cycles.
701 * @nor: pointer to a 'struct spi_nor'
702 * @settings: configuration detection command descriptor, dword1
703 *
704 * Return: the number of dummy cycles for an SMPT read
705 */
706static u8 spi_nor_smpt_read_dummy(const struct spi_nor *nor, const u32 settings)
707{
708 u8 read_dummy = SMPT_CMD_READ_DUMMY(settings);
709
710 if (read_dummy == SMPT_CMD_READ_DUMMY_IS_VARIABLE)
711 return nor->read_dummy;
712 return read_dummy;
713}
714
715/**
716 * spi_nor_get_map_in_use() - get the configuration map in use
717 * @nor: pointer to a 'struct spi_nor'
718 * @smpt: pointer to the sector map parameter table
719 * @smpt_len: sector map parameter table length
720 *
721 * Return: pointer to the map in use, ERR_PTR(-errno) otherwise.
722 */
723static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt,
724 u8 smpt_len)
725{
726 const u32 *ret;
727 u8 *buf;
728 u32 addr;
729 int err;
730 u8 i;
731 u8 addr_nbytes, read_opcode, read_dummy;
732 u8 read_data_mask, map_id;
733
734 /* Use a kmalloc'ed bounce buffer to guarantee it is DMA-able. */
735 buf = kmalloc(size: sizeof(*buf), GFP_KERNEL);
736 if (!buf)
737 return ERR_PTR(error: -ENOMEM);
738
739 addr_nbytes = nor->addr_nbytes;
740 read_dummy = nor->read_dummy;
741 read_opcode = nor->read_opcode;
742
743 map_id = 0;
744 /* Determine if there are any optional Detection Command Descriptors */
745 for (i = 0; i < smpt_len; i += 2) {
746 if (smpt[i] & SMPT_DESC_TYPE_MAP)
747 break;
748
749 read_data_mask = SMPT_CMD_READ_DATA(smpt[i]);
750 nor->addr_nbytes = spi_nor_smpt_addr_nbytes(nor, settings: smpt[i]);
751 nor->read_dummy = spi_nor_smpt_read_dummy(nor, settings: smpt[i]);
752 nor->read_opcode = SMPT_CMD_OPCODE(smpt[i]);
753 addr = smpt[i + 1];
754
755 err = spi_nor_read_raw(nor, addr, len: 1, buf);
756 if (err) {
757 ret = ERR_PTR(error: err);
758 goto out;
759 }
760
761 /*
762 * Build an index value that is used to select the Sector Map
763 * Configuration that is currently in use.
764 */
765 map_id = map_id << 1 | !!(*buf & read_data_mask);
766 }
767
768 /*
769 * If command descriptors are provided, they always precede map
770 * descriptors in the table. There is no need to start the iteration
771 * over smpt array all over again.
772 *
773 * Find the matching configuration map.
774 */
775 ret = ERR_PTR(error: -EINVAL);
776 while (i < smpt_len) {
777 if (SMPT_MAP_ID(smpt[i]) == map_id) {
778 ret = smpt + i;
779 break;
780 }
781
782 /*
783 * If there are no more configuration map descriptors and no
784 * configuration ID matched the configuration identifier, the
785 * sector address map is unknown.
786 */
787 if (smpt[i] & SMPT_DESC_END)
788 break;
789
790 /* increment the table index to the next map */
791 i += SMPT_MAP_REGION_COUNT(smpt[i]) + 1;
792 }
793
794 /* fall through */
795out:
796 kfree(objp: buf);
797 nor->addr_nbytes = addr_nbytes;
798 nor->read_dummy = read_dummy;
799 nor->read_opcode = read_opcode;
800 return ret;
801}
802
803/**
804 * spi_nor_region_check_overlay() - set overlay bit when the region is overlaid
805 * @region: pointer to a structure that describes a SPI NOR erase region
806 * @erase: pointer to a structure that describes a SPI NOR erase type
807 * @erase_type: erase type bitmask
808 */
809static void
810spi_nor_region_check_overlay(struct spi_nor_erase_region *region,
811 const struct spi_nor_erase_type *erase,
812 const u8 erase_type)
813{
814 int i;
815
816 for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
817 if (!(erase[i].size && erase_type & BIT(erase[i].idx)))
818 continue;
819 if (region->size & erase[i].size_mask) {
820 region->overlaid = true;
821 return;
822 }
823 }
824}
825
826/**
827 * spi_nor_init_non_uniform_erase_map() - initialize the non-uniform erase map
828 * @nor: pointer to a 'struct spi_nor'
829 * @smpt: pointer to the sector map parameter table
830 *
831 * Return: 0 on success, -errno otherwise.
832 */
833static int spi_nor_init_non_uniform_erase_map(struct spi_nor *nor,
834 const u32 *smpt)
835{
836 struct spi_nor_erase_map *map = &nor->params->erase_map;
837 struct spi_nor_erase_type *erase = map->erase_type;
838 struct spi_nor_erase_region *region;
839 u64 offset;
840 u32 region_count;
841 int i, j;
842 u8 uniform_erase_type, save_uniform_erase_type;
843 u8 erase_type, regions_erase_type;
844
845 region_count = SMPT_MAP_REGION_COUNT(*smpt);
846 /*
847 * The regions will be freed when the driver detaches from the
848 * device.
849 */
850 region = devm_kcalloc(dev: nor->dev, n: region_count, size: sizeof(*region),
851 GFP_KERNEL);
852 if (!region)
853 return -ENOMEM;
854 map->regions = region;
855 map->n_regions = region_count;
856
857 uniform_erase_type = 0xff;
858 regions_erase_type = 0;
859 offset = 0;
860 /* Populate regions. */
861 for (i = 0; i < region_count; i++) {
862 j = i + 1; /* index for the region dword */
863 region[i].offset = offset;
864 region[i].size = SMPT_MAP_REGION_SIZE(smpt[j]);
865 erase_type = SMPT_MAP_REGION_ERASE_TYPE(smpt[j]);
866 region[i].erase_mask = erase_type;
867
868 spi_nor_region_check_overlay(region: &region[i], erase, erase_type);
869
870 /*
871 * Save the erase types that are supported in all regions and
872 * can erase the entire flash memory.
873 */
874 uniform_erase_type &= erase_type;
875
876 /*
877 * regions_erase_type mask will indicate all the erase types
878 * supported in this configuration map.
879 */
880 regions_erase_type |= erase_type;
881
882 offset = region[i].offset + region[i].size;
883 }
884
885 save_uniform_erase_type = map->uniform_region.erase_mask;
886 map->uniform_region.erase_mask =
887 spi_nor_sort_erase_mask(map,
888 erase_mask: uniform_erase_type);
889
890 if (!regions_erase_type) {
891 /*
892 * Roll back to the previous uniform_erase_type mask, SMPT is
893 * broken.
894 */
895 map->uniform_region.erase_mask = save_uniform_erase_type;
896 return -EINVAL;
897 }
898
899 /*
900 * BFPT advertises all the erase types supported by all the possible
901 * map configurations. Mask out the erase types that are not supported
902 * by the current map configuration.
903 */
904 for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++)
905 if (!(regions_erase_type & BIT(erase[i].idx)))
906 spi_nor_mask_erase_type(erase: &erase[i]);
907
908 return 0;
909}
910
911/**
912 * spi_nor_parse_smpt() - parse Sector Map Parameter Table
913 * @nor: pointer to a 'struct spi_nor'
914 * @smpt_header: sector map parameter table header
915 *
916 * This table is optional, but when available, we parse it to identify the
917 * location and size of sectors within the main data array of the flash memory
918 * device and to identify which Erase Types are supported by each sector.
919 *
920 * Return: 0 on success, -errno otherwise.
921 */
922static int spi_nor_parse_smpt(struct spi_nor *nor,
923 const struct sfdp_parameter_header *smpt_header)
924{
925 const u32 *sector_map;
926 u32 *smpt;
927 size_t len;
928 u32 addr;
929 int ret;
930
931 /* Read the Sector Map Parameter Table. */
932 len = smpt_header->length * sizeof(*smpt);
933 smpt = kmalloc(size: len, GFP_KERNEL);
934 if (!smpt)
935 return -ENOMEM;
936
937 addr = SFDP_PARAM_HEADER_PTP(smpt_header);
938 ret = spi_nor_read_sfdp(nor, addr, len, buf: smpt);
939 if (ret)
940 goto out;
941
942 /* Fix endianness of the SMPT DWORDs. */
943 le32_to_cpu_array(buf: smpt, words: smpt_header->length);
944
945 sector_map = spi_nor_get_map_in_use(nor, smpt, smpt_len: smpt_header->length);
946 if (IS_ERR(ptr: sector_map)) {
947 ret = PTR_ERR(ptr: sector_map);
948 goto out;
949 }
950
951 ret = spi_nor_init_non_uniform_erase_map(nor, smpt: sector_map);
952 if (ret)
953 goto out;
954
955 spi_nor_regions_sort_erase_types(map: &nor->params->erase_map);
956 /* fall through */
957out:
958 kfree(objp: smpt);
959 return ret;
960}
961
962/**
963 * spi_nor_parse_4bait() - parse the 4-Byte Address Instruction Table
964 * @nor: pointer to a 'struct spi_nor'.
965 * @param_header: pointer to the 'struct sfdp_parameter_header' describing
966 * the 4-Byte Address Instruction Table length and version.
967 *
968 * Return: 0 on success, -errno otherwise.
969 */
970static int spi_nor_parse_4bait(struct spi_nor *nor,
971 const struct sfdp_parameter_header *param_header)
972{
973 static const struct sfdp_4bait reads[] = {
974 { SNOR_HWCAPS_READ, BIT(0) },
975 { SNOR_HWCAPS_READ_FAST, BIT(1) },
976 { SNOR_HWCAPS_READ_1_1_2, BIT(2) },
977 { SNOR_HWCAPS_READ_1_2_2, BIT(3) },
978 { SNOR_HWCAPS_READ_1_1_4, BIT(4) },
979 { SNOR_HWCAPS_READ_1_4_4, BIT(5) },
980 { SNOR_HWCAPS_READ_1_1_1_DTR, BIT(13) },
981 { SNOR_HWCAPS_READ_1_2_2_DTR, BIT(14) },
982 { SNOR_HWCAPS_READ_1_4_4_DTR, BIT(15) },
983 { SNOR_HWCAPS_READ_1_1_8, BIT(20) },
984 { SNOR_HWCAPS_READ_1_8_8, BIT(21) },
985 };
986 static const struct sfdp_4bait programs[] = {
987 { SNOR_HWCAPS_PP, BIT(6) },
988 { SNOR_HWCAPS_PP_1_1_4, BIT(7) },
989 { SNOR_HWCAPS_PP_1_4_4, BIT(8) },
990 };
991 static const struct sfdp_4bait erases[SNOR_ERASE_TYPE_MAX] = {
992 { 0u /* not used */, BIT(9) },
993 { 0u /* not used */, BIT(10) },
994 { 0u /* not used */, BIT(11) },
995 { 0u /* not used */, BIT(12) },
996 };
997 struct spi_nor_flash_parameter *params = nor->params;
998 struct spi_nor_pp_command *params_pp = params->page_programs;
999 struct spi_nor_erase_map *map = &params->erase_map;
1000 struct spi_nor_erase_type *erase_type = map->erase_type;
1001 u32 *dwords;
1002 size_t len;
1003 u32 addr, discard_hwcaps, read_hwcaps, pp_hwcaps, erase_mask;
1004 int i, ret;
1005
1006 if (param_header->major != SFDP_JESD216_MAJOR ||
1007 param_header->length < SFDP_4BAIT_DWORD_MAX)
1008 return -EINVAL;
1009
1010 /* Read the 4-byte Address Instruction Table. */
1011 len = sizeof(*dwords) * SFDP_4BAIT_DWORD_MAX;
1012
1013 /* Use a kmalloc'ed bounce buffer to guarantee it is DMA-able. */
1014 dwords = kmalloc(size: len, GFP_KERNEL);
1015 if (!dwords)
1016 return -ENOMEM;
1017
1018 addr = SFDP_PARAM_HEADER_PTP(param_header);
1019 ret = spi_nor_read_sfdp(nor, addr, len, buf: dwords);
1020 if (ret)
1021 goto out;
1022
1023 /* Fix endianness of the 4BAIT DWORDs. */
1024 le32_to_cpu_array(buf: dwords, SFDP_4BAIT_DWORD_MAX);
1025
1026 /*
1027 * Compute the subset of (Fast) Read commands for which the 4-byte
1028 * version is supported.
1029 */
1030 discard_hwcaps = 0;
1031 read_hwcaps = 0;
1032 for (i = 0; i < ARRAY_SIZE(reads); i++) {
1033 const struct sfdp_4bait *read = &reads[i];
1034
1035 discard_hwcaps |= read->hwcaps;
1036 if ((params->hwcaps.mask & read->hwcaps) &&
1037 (dwords[SFDP_DWORD(1)] & read->supported_bit))
1038 read_hwcaps |= read->hwcaps;
1039 }
1040
1041 /*
1042 * Compute the subset of Page Program commands for which the 4-byte
1043 * version is supported.
1044 */
1045 pp_hwcaps = 0;
1046 for (i = 0; i < ARRAY_SIZE(programs); i++) {
1047 const struct sfdp_4bait *program = &programs[i];
1048
1049 /*
1050 * The 4 Byte Address Instruction (Optional) Table is the only
1051 * SFDP table that indicates support for Page Program Commands.
1052 * Bypass the params->hwcaps.mask and consider 4BAIT the biggest
1053 * authority for specifying Page Program support.
1054 */
1055 discard_hwcaps |= program->hwcaps;
1056 if (dwords[SFDP_DWORD(1)] & program->supported_bit)
1057 pp_hwcaps |= program->hwcaps;
1058 }
1059
1060 /*
1061 * Compute the subset of Sector Erase commands for which the 4-byte
1062 * version is supported.
1063 */
1064 erase_mask = 0;
1065 for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
1066 const struct sfdp_4bait *erase = &erases[i];
1067
1068 if (dwords[SFDP_DWORD(1)] & erase->supported_bit)
1069 erase_mask |= BIT(i);
1070 }
1071
1072 /* Replicate the sort done for the map's erase types in BFPT. */
1073 erase_mask = spi_nor_sort_erase_mask(map, erase_mask);
1074
1075 /*
1076 * We need at least one 4-byte op code per read, program and erase
1077 * operation; the .read(), .write() and .erase() hooks share the
1078 * nor->addr_nbytes value.
1079 */
1080 if (!read_hwcaps || !pp_hwcaps || !erase_mask)
1081 goto out;
1082
1083 /*
1084 * Discard all operations from the 4-byte instruction set which are
1085 * not supported by this memory.
1086 */
1087 params->hwcaps.mask &= ~discard_hwcaps;
1088 params->hwcaps.mask |= (read_hwcaps | pp_hwcaps);
1089
1090 /* Use the 4-byte address instruction set. */
1091 for (i = 0; i < SNOR_CMD_READ_MAX; i++) {
1092 struct spi_nor_read_command *read_cmd = &params->reads[i];
1093
1094 read_cmd->opcode = spi_nor_convert_3to4_read(opcode: read_cmd->opcode);
1095 }
1096
1097 /* 4BAIT is the only SFDP table that indicates page program support. */
1098 if (pp_hwcaps & SNOR_HWCAPS_PP) {
1099 spi_nor_set_pp_settings(pp: &params_pp[SNOR_CMD_PP],
1100 SPINOR_OP_PP_4B, proto: SNOR_PROTO_1_1_1);
1101 /*
1102 * Since xSPI Page Program opcode is backward compatible with
1103 * Legacy SPI, use Legacy SPI opcode there as well.
1104 */
1105 spi_nor_set_pp_settings(pp: &params_pp[SNOR_CMD_PP_8_8_8_DTR],
1106 SPINOR_OP_PP_4B, proto: SNOR_PROTO_8_8_8_DTR);
1107 }
1108 if (pp_hwcaps & SNOR_HWCAPS_PP_1_1_4)
1109 spi_nor_set_pp_settings(pp: &params_pp[SNOR_CMD_PP_1_1_4],
1110 SPINOR_OP_PP_1_1_4_4B,
1111 proto: SNOR_PROTO_1_1_4);
1112 if (pp_hwcaps & SNOR_HWCAPS_PP_1_4_4)
1113 spi_nor_set_pp_settings(pp: &params_pp[SNOR_CMD_PP_1_4_4],
1114 SPINOR_OP_PP_1_4_4_4B,
1115 proto: SNOR_PROTO_1_4_4);
1116
1117 for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
1118 if (erase_mask & BIT(i))
1119 erase_type[i].opcode = (dwords[SFDP_DWORD(2)] >>
1120 erase_type[i].idx * 8) & 0xFF;
1121 else
1122 spi_nor_mask_erase_type(erase: &erase_type[i]);
1123 }
1124
1125 /*
1126 * We set SNOR_F_HAS_4BAIT in order to skip spi_nor_set_4byte_opcodes()
1127 * later because we already did the conversion to 4byte opcodes. Also,
1128 * this latest function implements a legacy quirk for the erase size of
1129 * Spansion memory. However this quirk is no longer needed with new
1130 * SFDP compliant memories.
1131 */
1132 params->addr_nbytes = 4;
1133 nor->flags |= SNOR_F_4B_OPCODES | SNOR_F_HAS_4BAIT;
1134
1135 /* fall through */
1136out:
1137 kfree(objp: dwords);
1138 return ret;
1139}
1140
1141#define PROFILE1_DWORD1_RDSR_ADDR_BYTES BIT(29)
1142#define PROFILE1_DWORD1_RDSR_DUMMY BIT(28)
1143#define PROFILE1_DWORD1_RD_FAST_CMD GENMASK(15, 8)
1144#define PROFILE1_DWORD4_DUMMY_200MHZ GENMASK(11, 7)
1145#define PROFILE1_DWORD5_DUMMY_166MHZ GENMASK(31, 27)
1146#define PROFILE1_DWORD5_DUMMY_133MHZ GENMASK(21, 17)
1147#define PROFILE1_DWORD5_DUMMY_100MHZ GENMASK(11, 7)
1148
1149/**
1150 * spi_nor_parse_profile1() - parse the xSPI Profile 1.0 table
1151 * @nor: pointer to a 'struct spi_nor'
1152 * @profile1_header: pointer to the 'struct sfdp_parameter_header' describing
1153 * the Profile 1.0 Table length and version.
1154 *
1155 * Return: 0 on success, -errno otherwise.
1156 */
1157static int spi_nor_parse_profile1(struct spi_nor *nor,
1158 const struct sfdp_parameter_header *profile1_header)
1159{
1160 u32 *dwords, addr;
1161 size_t len;
1162 int ret;
1163 u8 dummy, opcode;
1164
1165 len = profile1_header->length * sizeof(*dwords);
1166 dwords = kmalloc(size: len, GFP_KERNEL);
1167 if (!dwords)
1168 return -ENOMEM;
1169
1170 addr = SFDP_PARAM_HEADER_PTP(profile1_header);
1171 ret = spi_nor_read_sfdp(nor, addr, len, buf: dwords);
1172 if (ret)
1173 goto out;
1174
1175 le32_to_cpu_array(buf: dwords, words: profile1_header->length);
1176
1177 /* Get 8D-8D-8D fast read opcode and dummy cycles. */
1178 opcode = FIELD_GET(PROFILE1_DWORD1_RD_FAST_CMD, dwords[SFDP_DWORD(1)]);
1179
1180 /* Set the Read Status Register dummy cycles and dummy address bytes. */
1181 if (dwords[SFDP_DWORD(1)] & PROFILE1_DWORD1_RDSR_DUMMY)
1182 nor->params->rdsr_dummy = 8;
1183 else
1184 nor->params->rdsr_dummy = 4;
1185
1186 if (dwords[SFDP_DWORD(1)] & PROFILE1_DWORD1_RDSR_ADDR_BYTES)
1187 nor->params->rdsr_addr_nbytes = 4;
1188 else
1189 nor->params->rdsr_addr_nbytes = 0;
1190
1191 /*
1192 * We don't know what speed the controller is running at. Find the
1193 * dummy cycles for the fastest frequency the flash can run at to be
1194 * sure we are never short of dummy cycles. A value of 0 means the
1195 * frequency is not supported.
1196 *
1197 * Default to PROFILE1_DUMMY_DEFAULT if we don't find anything, and let
1198 * flashes set the correct value if needed in their fixup hooks.
1199 */
1200 dummy = FIELD_GET(PROFILE1_DWORD4_DUMMY_200MHZ, dwords[SFDP_DWORD(4)]);
1201 if (!dummy)
1202 dummy = FIELD_GET(PROFILE1_DWORD5_DUMMY_166MHZ,
1203 dwords[SFDP_DWORD(5)]);
1204 if (!dummy)
1205 dummy = FIELD_GET(PROFILE1_DWORD5_DUMMY_133MHZ,
1206 dwords[SFDP_DWORD(5)]);
1207 if (!dummy)
1208 dummy = FIELD_GET(PROFILE1_DWORD5_DUMMY_100MHZ,
1209 dwords[SFDP_DWORD(5)]);
1210 if (!dummy)
1211 dev_dbg(nor->dev,
1212 "Can't find dummy cycles from Profile 1.0 table\n");
1213
1214 /* Round up to an even value to avoid tripping controllers up. */
1215 dummy = round_up(dummy, 2);
1216
1217 /* Update the fast read settings. */
1218 nor->params->hwcaps.mask |= SNOR_HWCAPS_READ_8_8_8_DTR;
1219 spi_nor_set_read_settings(read: &nor->params->reads[SNOR_CMD_READ_8_8_8_DTR],
1220 num_mode_clocks: 0, num_wait_states: dummy, opcode,
1221 proto: SNOR_PROTO_8_8_8_DTR);
1222
1223 /*
1224 * Page Program is "Required Command" in the xSPI Profile 1.0. Update
1225 * the params->hwcaps.mask here.
1226 */
1227 nor->params->hwcaps.mask |= SNOR_HWCAPS_PP_8_8_8_DTR;
1228
1229out:
1230 kfree(objp: dwords);
1231 return ret;
1232}
1233
1234#define SCCR_DWORD22_OCTAL_DTR_EN_VOLATILE BIT(31)
1235
1236/**
1237 * spi_nor_parse_sccr() - Parse the Status, Control and Configuration Register
1238 * Map.
1239 * @nor: pointer to a 'struct spi_nor'
1240 * @sccr_header: pointer to the 'struct sfdp_parameter_header' describing
1241 * the SCCR Map table length and version.
1242 *
1243 * Return: 0 on success, -errno otherwise.
1244 */
1245static int spi_nor_parse_sccr(struct spi_nor *nor,
1246 const struct sfdp_parameter_header *sccr_header)
1247{
1248 struct spi_nor_flash_parameter *params = nor->params;
1249 u32 *dwords, addr;
1250 size_t len;
1251 int ret;
1252
1253 len = sccr_header->length * sizeof(*dwords);
1254 dwords = kmalloc(size: len, GFP_KERNEL);
1255 if (!dwords)
1256 return -ENOMEM;
1257
1258 addr = SFDP_PARAM_HEADER_PTP(sccr_header);
1259 ret = spi_nor_read_sfdp(nor, addr, len, buf: dwords);
1260 if (ret)
1261 goto out;
1262
1263 le32_to_cpu_array(buf: dwords, words: sccr_header->length);
1264
1265 /* Address offset for volatile registers (die 0) */
1266 if (!params->vreg_offset) {
1267 params->vreg_offset = devm_kmalloc(dev: nor->dev, size: sizeof(*dwords),
1268 GFP_KERNEL);
1269 if (!params->vreg_offset) {
1270 ret = -ENOMEM;
1271 goto out;
1272 }
1273 }
1274 params->vreg_offset[0] = dwords[SFDP_DWORD(1)];
1275 params->n_dice = 1;
1276
1277 if (FIELD_GET(SCCR_DWORD22_OCTAL_DTR_EN_VOLATILE,
1278 dwords[SFDP_DWORD(22)]))
1279 nor->flags |= SNOR_F_IO_MODE_EN_VOLATILE;
1280
1281out:
1282 kfree(objp: dwords);
1283 return ret;
1284}
1285
1286/**
1287 * spi_nor_parse_sccr_mc() - Parse the Status, Control and Configuration
1288 * Register Map Offsets for Multi-Chip SPI Memory
1289 * Devices.
1290 * @nor: pointer to a 'struct spi_nor'
1291 * @sccr_mc_header: pointer to the 'struct sfdp_parameter_header' describing
1292 * the SCCR Map offsets table length and version.
1293 *
1294 * Return: 0 on success, -errno otherwise.
1295 */
1296static int spi_nor_parse_sccr_mc(struct spi_nor *nor,
1297 const struct sfdp_parameter_header *sccr_mc_header)
1298{
1299 struct spi_nor_flash_parameter *params = nor->params;
1300 u32 *dwords, addr;
1301 u8 i, n_dice;
1302 size_t len;
1303 int ret;
1304
1305 len = sccr_mc_header->length * sizeof(*dwords);
1306 dwords = kmalloc(size: len, GFP_KERNEL);
1307 if (!dwords)
1308 return -ENOMEM;
1309
1310 addr = SFDP_PARAM_HEADER_PTP(sccr_mc_header);
1311 ret = spi_nor_read_sfdp(nor, addr, len, buf: dwords);
1312 if (ret)
1313 goto out;
1314
1315 le32_to_cpu_array(buf: dwords, words: sccr_mc_header->length);
1316
1317 /*
1318 * Pair of DOWRDs (volatile and non-volatile register offsets) per
1319 * additional die. Hence, length = 2 * (number of additional dice).
1320 */
1321 n_dice = 1 + sccr_mc_header->length / 2;
1322
1323 /* Address offset for volatile registers of additional dice */
1324 params->vreg_offset =
1325 devm_krealloc(dev: nor->dev, ptr: params->vreg_offset,
1326 size: n_dice * sizeof(*dwords),
1327 GFP_KERNEL);
1328 if (!params->vreg_offset) {
1329 ret = -ENOMEM;
1330 goto out;
1331 }
1332
1333 for (i = 1; i < n_dice; i++)
1334 params->vreg_offset[i] = dwords[SFDP_DWORD(i) * 2];
1335
1336 params->n_dice = n_dice;
1337
1338out:
1339 kfree(objp: dwords);
1340 return ret;
1341}
1342
1343/**
1344 * spi_nor_post_sfdp_fixups() - Updates the flash's parameters and settings
1345 * after SFDP has been parsed. Called only for flashes that define JESD216 SFDP
1346 * tables.
1347 * @nor: pointer to a 'struct spi_nor'
1348 *
1349 * Used to tweak various flash parameters when information provided by the SFDP
1350 * tables are wrong.
1351 */
1352static int spi_nor_post_sfdp_fixups(struct spi_nor *nor)
1353{
1354 int ret;
1355
1356 if (nor->manufacturer && nor->manufacturer->fixups &&
1357 nor->manufacturer->fixups->post_sfdp) {
1358 ret = nor->manufacturer->fixups->post_sfdp(nor);
1359 if (ret)
1360 return ret;
1361 }
1362
1363 if (nor->info->fixups && nor->info->fixups->post_sfdp)
1364 return nor->info->fixups->post_sfdp(nor);
1365
1366 return 0;
1367}
1368
1369/**
1370 * spi_nor_check_sfdp_signature() - check for a valid SFDP signature
1371 * @nor: pointer to a 'struct spi_nor'
1372 *
1373 * Used to detect if the flash supports the RDSFDP command as well as the
1374 * presence of a valid SFDP table.
1375 *
1376 * Return: 0 on success, -errno otherwise.
1377 */
1378int spi_nor_check_sfdp_signature(struct spi_nor *nor)
1379{
1380 u32 signature;
1381 int err;
1382
1383 /* Get the SFDP header. */
1384 err = spi_nor_read_sfdp_dma_unsafe(nor, addr: 0, len: sizeof(signature),
1385 buf: &signature);
1386 if (err < 0)
1387 return err;
1388
1389 /* Check the SFDP signature. */
1390 if (le32_to_cpu(signature) != SFDP_SIGNATURE)
1391 return -EINVAL;
1392
1393 return 0;
1394}
1395
1396/**
1397 * spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
1398 * @nor: pointer to a 'struct spi_nor'
1399 *
1400 * The Serial Flash Discoverable Parameters are described by the JEDEC JESD216
1401 * specification. This is a standard which tends to supported by almost all
1402 * (Q)SPI memory manufacturers. Those hard-coded tables allow us to learn at
1403 * runtime the main parameters needed to perform basic SPI flash operations such
1404 * as Fast Read, Page Program or Sector Erase commands.
1405 *
1406 * Return: 0 on success, -errno otherwise.
1407 */
1408int spi_nor_parse_sfdp(struct spi_nor *nor)
1409{
1410 const struct sfdp_parameter_header *param_header, *bfpt_header;
1411 struct sfdp_parameter_header *param_headers = NULL;
1412 struct sfdp_header header;
1413 struct device *dev = nor->dev;
1414 struct sfdp *sfdp;
1415 size_t sfdp_size;
1416 size_t psize;
1417 int i, err;
1418
1419 /* Get the SFDP header. */
1420 err = spi_nor_read_sfdp_dma_unsafe(nor, addr: 0, len: sizeof(header), buf: &header);
1421 if (err < 0)
1422 return err;
1423
1424 /* Check the SFDP header version. */
1425 if (le32_to_cpu(header.signature) != SFDP_SIGNATURE ||
1426 header.major != SFDP_JESD216_MAJOR)
1427 return -EINVAL;
1428
1429 /*
1430 * Verify that the first and only mandatory parameter header is a
1431 * Basic Flash Parameter Table header as specified in JESD216.
1432 */
1433 bfpt_header = &header.bfpt_header;
1434 if (SFDP_PARAM_HEADER_ID(bfpt_header) != SFDP_BFPT_ID ||
1435 bfpt_header->major != SFDP_JESD216_MAJOR)
1436 return -EINVAL;
1437
1438 sfdp_size = SFDP_PARAM_HEADER_PTP(bfpt_header) +
1439 SFDP_PARAM_HEADER_PARAM_LEN(bfpt_header);
1440
1441 /*
1442 * Allocate memory then read all parameter headers with a single
1443 * Read SFDP command. These parameter headers will actually be parsed
1444 * twice: a first time to get the latest revision of the basic flash
1445 * parameter table, then a second time to handle the supported optional
1446 * tables.
1447 * Hence we read the parameter headers once for all to reduce the
1448 * processing time. Also we use kmalloc() instead of devm_kmalloc()
1449 * because we don't need to keep these parameter headers: the allocated
1450 * memory is always released with kfree() before exiting this function.
1451 */
1452 if (header.nph) {
1453 psize = header.nph * sizeof(*param_headers);
1454
1455 param_headers = kmalloc(size: psize, GFP_KERNEL);
1456 if (!param_headers)
1457 return -ENOMEM;
1458
1459 err = spi_nor_read_sfdp(nor, addr: sizeof(header),
1460 len: psize, buf: param_headers);
1461 if (err < 0) {
1462 dev_dbg(dev, "failed to read SFDP parameter headers\n");
1463 goto exit;
1464 }
1465 }
1466
1467 /*
1468 * Cache the complete SFDP data. It is not (easily) possible to fetch
1469 * SFDP after probe time and we need it for the sysfs access.
1470 */
1471 for (i = 0; i < header.nph; i++) {
1472 param_header = &param_headers[i];
1473 sfdp_size = max_t(size_t, sfdp_size,
1474 SFDP_PARAM_HEADER_PTP(param_header) +
1475 SFDP_PARAM_HEADER_PARAM_LEN(param_header));
1476 }
1477
1478 /*
1479 * Limit the total size to a reasonable value to avoid allocating too
1480 * much memory just of because the flash returned some insane values.
1481 */
1482 if (sfdp_size > PAGE_SIZE) {
1483 dev_dbg(dev, "SFDP data (%zu) too big, truncating\n",
1484 sfdp_size);
1485 sfdp_size = PAGE_SIZE;
1486 }
1487
1488 sfdp = devm_kzalloc(dev, size: sizeof(*sfdp), GFP_KERNEL);
1489 if (!sfdp) {
1490 err = -ENOMEM;
1491 goto exit;
1492 }
1493
1494 /*
1495 * The SFDP is organized in chunks of DWORDs. Thus, in theory, the
1496 * sfdp_size should be a multiple of DWORDs. But in case a flash
1497 * is not spec compliant, make sure that we have enough space to store
1498 * the complete SFDP data.
1499 */
1500 sfdp->num_dwords = DIV_ROUND_UP(sfdp_size, sizeof(*sfdp->dwords));
1501 sfdp->dwords = devm_kcalloc(dev, n: sfdp->num_dwords,
1502 size: sizeof(*sfdp->dwords), GFP_KERNEL);
1503 if (!sfdp->dwords) {
1504 err = -ENOMEM;
1505 devm_kfree(dev, p: sfdp);
1506 goto exit;
1507 }
1508
1509 err = spi_nor_read_sfdp(nor, addr: 0, len: sfdp_size, buf: sfdp->dwords);
1510 if (err < 0) {
1511 dev_dbg(dev, "failed to read SFDP data\n");
1512 devm_kfree(dev, p: sfdp->dwords);
1513 devm_kfree(dev, p: sfdp);
1514 goto exit;
1515 }
1516
1517 nor->sfdp = sfdp;
1518
1519 /*
1520 * Check other parameter headers to get the latest revision of
1521 * the basic flash parameter table.
1522 */
1523 for (i = 0; i < header.nph; i++) {
1524 param_header = &param_headers[i];
1525
1526 if (SFDP_PARAM_HEADER_ID(param_header) == SFDP_BFPT_ID &&
1527 param_header->major == SFDP_JESD216_MAJOR &&
1528 (param_header->minor > bfpt_header->minor ||
1529 (param_header->minor == bfpt_header->minor &&
1530 param_header->length > bfpt_header->length)))
1531 bfpt_header = param_header;
1532 }
1533
1534 err = spi_nor_parse_bfpt(nor, bfpt_header);
1535 if (err)
1536 goto exit;
1537
1538 /* Parse optional parameter tables. */
1539 for (i = 0; i < header.nph; i++) {
1540 param_header = &param_headers[i];
1541
1542 switch (SFDP_PARAM_HEADER_ID(param_header)) {
1543 case SFDP_SECTOR_MAP_ID:
1544 err = spi_nor_parse_smpt(nor, smpt_header: param_header);
1545 break;
1546
1547 case SFDP_4BAIT_ID:
1548 err = spi_nor_parse_4bait(nor, param_header);
1549 break;
1550
1551 case SFDP_PROFILE1_ID:
1552 err = spi_nor_parse_profile1(nor, profile1_header: param_header);
1553 break;
1554
1555 case SFDP_SCCR_MAP_ID:
1556 err = spi_nor_parse_sccr(nor, sccr_header: param_header);
1557 break;
1558
1559 case SFDP_SCCR_MAP_MC_ID:
1560 err = spi_nor_parse_sccr_mc(nor, sccr_mc_header: param_header);
1561 break;
1562
1563 default:
1564 break;
1565 }
1566
1567 if (err) {
1568 dev_warn(dev, "Failed to parse optional parameter table: %04x\n",
1569 SFDP_PARAM_HEADER_ID(param_header));
1570 /*
1571 * Let's not drop all information we extracted so far
1572 * if optional table parsers fail. In case of failing,
1573 * each optional parser is responsible to roll back to
1574 * the previously known spi_nor data.
1575 */
1576 err = 0;
1577 }
1578 }
1579
1580 err = spi_nor_post_sfdp_fixups(nor);
1581exit:
1582 kfree(objp: param_headers);
1583 return err;
1584}
1585

source code of linux/drivers/mtd/spi-nor/sfdp.c