2 * st_spi_fsm.c - ST Fast Sequence Mode (FSM) Serial Flash Controller
4 * Author: Angus Clark <angus.clark@st.com>
6 * Copyright (C) 2010-2014 STicroelectronics Limited
8 * JEDEC probe based on drivers/mtd/devices/m25p80.c
10 * This code is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/regmap.h>
18 #include <linux/platform_device.h>
19 #include <linux/mfd/syscon.h>
20 #include <linux/mtd/mtd.h>
21 #include <linux/sched.h>
22 #include <linux/delay.h>
26 #include "serial_flash_cmds.h"
29 * FSM SPI Controller Registers
31 #define SPI_CLOCKDIV 0x0010
32 #define SPI_MODESELECT 0x0018
33 #define SPI_CONFIGDATA 0x0020
34 #define SPI_STA_MODE_CHANGE 0x0028
35 #define SPI_FAST_SEQ_TRANSFER_SIZE 0x0100
36 #define SPI_FAST_SEQ_ADD1 0x0104
37 #define SPI_FAST_SEQ_ADD2 0x0108
38 #define SPI_FAST_SEQ_ADD_CFG 0x010c
39 #define SPI_FAST_SEQ_OPC1 0x0110
40 #define SPI_FAST_SEQ_OPC2 0x0114
41 #define SPI_FAST_SEQ_OPC3 0x0118
42 #define SPI_FAST_SEQ_OPC4 0x011c
43 #define SPI_FAST_SEQ_OPC5 0x0120
44 #define SPI_MODE_BITS 0x0124
45 #define SPI_DUMMY_BITS 0x0128
46 #define SPI_FAST_SEQ_FLASH_STA_DATA 0x012c
47 #define SPI_FAST_SEQ_1 0x0130
48 #define SPI_FAST_SEQ_2 0x0134
49 #define SPI_FAST_SEQ_3 0x0138
50 #define SPI_FAST_SEQ_4 0x013c
51 #define SPI_FAST_SEQ_CFG 0x0140
52 #define SPI_FAST_SEQ_STA 0x0144
53 #define SPI_QUAD_BOOT_SEQ_INIT_1 0x0148
54 #define SPI_QUAD_BOOT_SEQ_INIT_2 0x014c
55 #define SPI_QUAD_BOOT_READ_SEQ_1 0x0150
56 #define SPI_QUAD_BOOT_READ_SEQ_2 0x0154
57 #define SPI_PROGRAM_ERASE_TIME 0x0158
58 #define SPI_MULT_PAGE_REPEAT_SEQ_1 0x015c
59 #define SPI_MULT_PAGE_REPEAT_SEQ_2 0x0160
60 #define SPI_STATUS_WR_TIME_REG 0x0164
61 #define SPI_FAST_SEQ_DATA_REG 0x0300
64 * Register: SPI_MODESELECT
66 #define SPI_MODESELECT_CONTIG 0x01
67 #define SPI_MODESELECT_FASTREAD 0x02
68 #define SPI_MODESELECT_DUALIO 0x04
69 #define SPI_MODESELECT_FSM 0x08
70 #define SPI_MODESELECT_QUADBOOT 0x10
73 * Register: SPI_CONFIGDATA
75 #define SPI_CFG_DEVICE_ST 0x1
76 #define SPI_CFG_DEVICE_ATMEL 0x4
77 #define SPI_CFG_MIN_CS_HIGH(x) (((x) & 0xfff) << 4)
78 #define SPI_CFG_CS_SETUPHOLD(x) (((x) & 0xff) << 16)
79 #define SPI_CFG_DATA_HOLD(x) (((x) & 0xff) << 24)
81 #define SPI_CFG_DEFAULT_MIN_CS_HIGH SPI_CFG_MIN_CS_HIGH(0x0AA)
82 #define SPI_CFG_DEFAULT_CS_SETUPHOLD SPI_CFG_CS_SETUPHOLD(0xA0)
83 #define SPI_CFG_DEFAULT_DATA_HOLD SPI_CFG_DATA_HOLD(0x00)
86 * Register: SPI_FAST_SEQ_TRANSFER_SIZE
88 #define TRANSFER_SIZE(x) ((x) * 8)
91 * Register: SPI_FAST_SEQ_ADD_CFG
93 #define ADR_CFG_CYCLES_ADD1(x) ((x) << 0)
94 #define ADR_CFG_PADS_1_ADD1 (0x0 << 6)
95 #define ADR_CFG_PADS_2_ADD1 (0x1 << 6)
96 #define ADR_CFG_PADS_4_ADD1 (0x3 << 6)
97 #define ADR_CFG_CSDEASSERT_ADD1 (1 << 8)
98 #define ADR_CFG_CYCLES_ADD2(x) ((x) << (0+16))
99 #define ADR_CFG_PADS_1_ADD2 (0x0 << (6+16))
100 #define ADR_CFG_PADS_2_ADD2 (0x1 << (6+16))
101 #define ADR_CFG_PADS_4_ADD2 (0x3 << (6+16))
102 #define ADR_CFG_CSDEASSERT_ADD2 (1 << (8+16))
105 * Register: SPI_FAST_SEQ_n
107 #define SEQ_OPC_OPCODE(x) ((x) << 0)
108 #define SEQ_OPC_CYCLES(x) ((x) << 8)
109 #define SEQ_OPC_PADS_1 (0x0 << 14)
110 #define SEQ_OPC_PADS_2 (0x1 << 14)
111 #define SEQ_OPC_PADS_4 (0x3 << 14)
112 #define SEQ_OPC_CSDEASSERT (1 << 16)
115 * Register: SPI_FAST_SEQ_CFG
117 #define SEQ_CFG_STARTSEQ (1 << 0)
118 #define SEQ_CFG_SWRESET (1 << 5)
119 #define SEQ_CFG_CSDEASSERT (1 << 6)
120 #define SEQ_CFG_READNOTWRITE (1 << 7)
121 #define SEQ_CFG_ERASE (1 << 8)
122 #define SEQ_CFG_PADS_1 (0x0 << 16)
123 #define SEQ_CFG_PADS_2 (0x1 << 16)
124 #define SEQ_CFG_PADS_4 (0x3 << 16)
127 * Register: SPI_MODE_BITS
129 #define MODE_DATA(x) (x & 0xff)
130 #define MODE_CYCLES(x) ((x & 0x3f) << 16)
131 #define MODE_PADS_1 (0x0 << 22)
132 #define MODE_PADS_2 (0x1 << 22)
133 #define MODE_PADS_4 (0x3 << 22)
134 #define DUMMY_CSDEASSERT (1 << 24)
137 * Register: SPI_DUMMY_BITS
139 #define DUMMY_CYCLES(x) ((x & 0x3f) << 16)
140 #define DUMMY_PADS_1 (0x0 << 22)
141 #define DUMMY_PADS_2 (0x1 << 22)
142 #define DUMMY_PADS_4 (0x3 << 22)
143 #define DUMMY_CSDEASSERT (1 << 24)
146 * Register: SPI_FAST_SEQ_FLASH_STA_DATA
148 #define STA_DATA_BYTE1(x) ((x & 0xff) << 0)
149 #define STA_DATA_BYTE2(x) ((x & 0xff) << 8)
150 #define STA_PADS_1 (0x0 << 16)
151 #define STA_PADS_2 (0x1 << 16)
152 #define STA_PADS_4 (0x3 << 16)
153 #define STA_CSDEASSERT (0x1 << 20)
154 #define STA_RDNOTWR (0x1 << 21)
157 * FSM SPI Instruction Opcodes
159 #define STFSM_OPC_CMD 0x1
160 #define STFSM_OPC_ADD 0x2
161 #define STFSM_OPC_STA 0x3
162 #define STFSM_OPC_MODE 0x4
163 #define STFSM_OPC_DUMMY 0x5
164 #define STFSM_OPC_DATA 0x6
165 #define STFSM_OPC_WAIT 0x7
166 #define STFSM_OPC_JUMP 0x8
167 #define STFSM_OPC_GOTO 0x9
168 #define STFSM_OPC_STOP 0xF
171 * FSM SPI Instructions (== opcode + operand).
173 #define STFSM_INSTR(cmd, op) ((cmd) | ((op) << 4))
175 #define STFSM_INST_CMD1 STFSM_INSTR(STFSM_OPC_CMD, 1)
176 #define STFSM_INST_CMD2 STFSM_INSTR(STFSM_OPC_CMD, 2)
177 #define STFSM_INST_CMD3 STFSM_INSTR(STFSM_OPC_CMD, 3)
178 #define STFSM_INST_CMD4 STFSM_INSTR(STFSM_OPC_CMD, 4)
179 #define STFSM_INST_CMD5 STFSM_INSTR(STFSM_OPC_CMD, 5)
180 #define STFSM_INST_ADD1 STFSM_INSTR(STFSM_OPC_ADD, 1)
181 #define STFSM_INST_ADD2 STFSM_INSTR(STFSM_OPC_ADD, 2)
183 #define STFSM_INST_DATA_WRITE STFSM_INSTR(STFSM_OPC_DATA, 1)
184 #define STFSM_INST_DATA_READ STFSM_INSTR(STFSM_OPC_DATA, 2)
186 #define STFSM_INST_STA_RD1 STFSM_INSTR(STFSM_OPC_STA, 0x1)
187 #define STFSM_INST_STA_WR1 STFSM_INSTR(STFSM_OPC_STA, 0x1)
188 #define STFSM_INST_STA_RD2 STFSM_INSTR(STFSM_OPC_STA, 0x2)
189 #define STFSM_INST_STA_WR1_2 STFSM_INSTR(STFSM_OPC_STA, 0x3)
191 #define STFSM_INST_MODE STFSM_INSTR(STFSM_OPC_MODE, 0)
192 #define STFSM_INST_DUMMY STFSM_INSTR(STFSM_OPC_DUMMY, 0)
193 #define STFSM_INST_WAIT STFSM_INSTR(STFSM_OPC_WAIT, 0)
194 #define STFSM_INST_STOP STFSM_INSTR(STFSM_OPC_STOP, 0)
196 #define STFSM_DEFAULT_EMI_FREQ 100000000UL /* 100 MHz */
197 #define STFSM_DEFAULT_WR_TIME (STFSM_DEFAULT_EMI_FREQ * (15/1000)) /* 15ms */
199 #define STFSM_FLASH_SAFE_FREQ 10000000UL /* 10 MHz */
201 #define STFSM_MAX_WAIT_SEQ_MS 1000 /* FSM execution time */
204 #define FLASH_CMD_WREN 0x06
205 #define FLASH_CMD_WRDI 0x04
206 #define FLASH_CMD_RDID 0x9f
207 #define FLASH_CMD_RDSR 0x05
208 #define FLASH_CMD_RDSR2 0x35
209 #define FLASH_CMD_WRSR 0x01
210 #define FLASH_CMD_SE_4K 0x20
211 #define FLASH_CMD_SE_32K 0x52
212 #define FLASH_CMD_SE 0xd8
213 #define FLASH_CMD_CHIPERASE 0xc7
214 #define FLASH_CMD_WRVCR 0x81
215 #define FLASH_CMD_RDVCR 0x85
217 #define FLASH_CMD_READ 0x03 /* READ */
218 #define FLASH_CMD_READ_FAST 0x0b /* FAST READ */
219 #define FLASH_CMD_READ_1_1_2 0x3b /* DUAL OUTPUT READ */
220 #define FLASH_CMD_READ_1_2_2 0xbb /* DUAL I/O READ */
221 #define FLASH_CMD_READ_1_1_4 0x6b /* QUAD OUTPUT READ */
222 #define FLASH_CMD_READ_1_4_4 0xeb /* QUAD I/O READ */
224 #define FLASH_CMD_WRITE 0x02 /* PAGE PROGRAM */
225 #define FLASH_CMD_WRITE_1_1_2 0xa2 /* DUAL INPUT PROGRAM */
226 #define FLASH_CMD_WRITE_1_2_2 0xd2 /* DUAL INPUT EXT PROGRAM */
227 #define FLASH_CMD_WRITE_1_1_4 0x32 /* QUAD INPUT PROGRAM */
228 #define FLASH_CMD_WRITE_1_4_4 0x12 /* QUAD INPUT EXT PROGRAM */
230 #define FLASH_CMD_EN4B_ADDR 0xb7 /* Enter 4-byte address mode */
231 #define FLASH_CMD_EX4B_ADDR 0xe9 /* Exit 4-byte address mode */
233 /* READ commands with 32-bit addressing (N25Q256 and S25FLxxxS) */
234 #define FLASH_CMD_READ4 0x13
235 #define FLASH_CMD_READ4_FAST 0x0c
236 #define FLASH_CMD_READ4_1_1_2 0x3c
237 #define FLASH_CMD_READ4_1_2_2 0xbc
238 #define FLASH_CMD_READ4_1_1_4 0x6c
239 #define FLASH_CMD_READ4_1_4_4 0xec
241 /* Status register */
242 #define FLASH_STATUS_BUSY 0x01
243 #define FLASH_STATUS_WEL 0x02
244 #define FLASH_STATUS_BP0 0x04
245 #define FLASH_STATUS_BP1 0x08
246 #define FLASH_STATUS_BP2 0x10
247 #define FLASH_STATUS_SRWP0 0x80
248 #define FLASH_STATUS_TIMEOUT 0xff
250 #define FLASH_PAGESIZE 256 /* In Bytes */
251 #define FLASH_PAGESIZE_32 (FLASH_PAGESIZE / 4) /* In uint32_t */
252 #define FLASH_MAX_BUSY_WAIT (300 * HZ) /* Maximum 'CHIPERASE' time */
255 * Flags to tweak operation of default read/write/erase routines
257 #define CFG_READ_TOGGLE_32BIT_ADDR 0x00000001
258 #define CFG_WRITE_TOGGLE_32BIT_ADDR 0x00000002
259 #define CFG_WRITE_EX_32BIT_ADDR_DELAY 0x00000004
260 #define CFG_ERASESEC_TOGGLE_32BIT_ADDR 0x00000008
261 #define CFG_S25FL_CHECK_ERROR_FLAGS 0x00000010
266 struct resource *region;
269 struct flash_info *info;
271 uint32_t configuration;
272 uint32_t fifo_dir_delay;
273 bool booted_from_spi;
289 } __packed __aligned(4);
291 /* Parameters to configure a READ or WRITE FSM sequence */
292 struct seq_rw_config {
293 uint32_t flags; /* flags to support config */
294 uint8_t cmd; /* FLASH command */
295 int write; /* Write Sequence */
296 uint8_t addr_pads; /* No. of addr pads (MODE & DUMMY) */
297 uint8_t data_pads; /* No. of data pads */
298 uint8_t mode_data; /* MODE data */
299 uint8_t mode_cycles; /* No. of MODE cycles */
300 uint8_t dummy_cycles; /* No. of DUMMY cycles */
303 /* SPI Flash Device Table */
307 * JEDEC id zero means "no ID" (most older chips); otherwise it has
308 * a high byte of zero plus three data bytes: the manufacturer id,
309 * then a two byte device id.
314 * The size listed here is what works with FLASH_CMD_SE, which isn't
315 * necessarily called a "sector" by the vendor.
317 unsigned sector_size;
321 * Note, where FAST_READ is supported, freq_max specifies the
322 * FAST_READ frequency, not the READ frequency.
325 int (*config)(struct stfsm *);
328 static int stfsm_n25q_config(struct stfsm *fsm);
330 static struct flash_info flash_types[] = {
332 * ST Microelectronics/Numonyx --
333 * (newer production versions may have feature updates
334 * (eg faster operating frequency)
336 #define M25P_FLAG (FLASH_FLAG_READ_WRITE | FLASH_FLAG_READ_FAST)
337 { "m25p40", 0x202013, 0, 64 * 1024, 8, M25P_FLAG, 25, NULL },
338 { "m25p80", 0x202014, 0, 64 * 1024, 16, M25P_FLAG, 25, NULL },
339 { "m25p16", 0x202015, 0, 64 * 1024, 32, M25P_FLAG, 25, NULL },
340 { "m25p32", 0x202016, 0, 64 * 1024, 64, M25P_FLAG, 50, NULL },
341 { "m25p64", 0x202017, 0, 64 * 1024, 128, M25P_FLAG, 50, NULL },
342 { "m25p128", 0x202018, 0, 256 * 1024, 64, M25P_FLAG, 50, NULL },
344 #define M25PX_FLAG (FLASH_FLAG_READ_WRITE | \
345 FLASH_FLAG_READ_FAST | \
346 FLASH_FLAG_READ_1_1_2 | \
347 FLASH_FLAG_WRITE_1_1_2)
348 { "m25px32", 0x207116, 0, 64 * 1024, 64, M25PX_FLAG, 75, NULL },
349 { "m25px64", 0x207117, 0, 64 * 1024, 128, M25PX_FLAG, 75, NULL },
351 #define MX25_FLAG (FLASH_FLAG_READ_WRITE | \
352 FLASH_FLAG_READ_FAST | \
353 FLASH_FLAG_READ_1_1_2 | \
354 FLASH_FLAG_READ_1_2_2 | \
355 FLASH_FLAG_READ_1_1_4 | \
356 FLASH_FLAG_READ_1_4_4 | \
359 { "mx25l25635e", 0xc22019, 0, 64*1024, 512,
360 (MX25_FLAG | FLASH_FLAG_32BIT_ADDR | FLASH_FLAG_RESET), 70, NULL }
362 #define N25Q_FLAG (FLASH_FLAG_READ_WRITE | \
363 FLASH_FLAG_READ_FAST | \
364 FLASH_FLAG_READ_1_1_2 | \
365 FLASH_FLAG_READ_1_2_2 | \
366 FLASH_FLAG_READ_1_1_4 | \
367 FLASH_FLAG_READ_1_4_4 | \
368 FLASH_FLAG_WRITE_1_1_2 | \
369 FLASH_FLAG_WRITE_1_2_2 | \
370 FLASH_FLAG_WRITE_1_1_4 | \
371 FLASH_FLAG_WRITE_1_4_4)
372 { "n25q128", 0x20ba18, 0, 64 * 1024, 256, N25Q_FLAG, 108,
374 { "n25q256", 0x20ba19, 0, 64 * 1024, 512,
375 N25Q_FLAG | FLASH_FLAG_32BIT_ADDR, 108, stfsm_n25q_config },
379 * - 256KiB and 64KiB sector variants (identified by ext. JEDEC)
381 #define S25FLXXXP_FLAG (FLASH_FLAG_READ_WRITE | \
382 FLASH_FLAG_READ_1_1_2 | \
383 FLASH_FLAG_READ_1_2_2 | \
384 FLASH_FLAG_READ_1_1_4 | \
385 FLASH_FLAG_READ_1_4_4 | \
386 FLASH_FLAG_WRITE_1_1_4 | \
387 FLASH_FLAG_READ_FAST)
388 { "s25fl129p0", 0x012018, 0x4d00, 256 * 1024, 64, S25FLXXXP_FLAG, 80,
390 { "s25fl129p1", 0x012018, 0x4d01, 64 * 1024, 256, S25FLXXXP_FLAG, 80,
395 * - 256KiB and 64KiB sector variants (identified by ext. JEDEC)
396 * - RESET# signal supported by die but not bristled out on all
397 * package types. The package type is a function of board design,
398 * so this information is captured in the board's flags.
399 * - Supports 'DYB' sector protection. Depending on variant, sectors
400 * may default to locked state on power-on.
402 #define S25FLXXXS_FLAG (S25FLXXXP_FLAG | \
404 FLASH_FLAG_DYB_LOCKING)
405 { "s25fl128s0", 0x012018, 0x0300, 256 * 1024, 64, S25FLXXXS_FLAG, 80,
407 { "s25fl128s1", 0x012018, 0x0301, 64 * 1024, 256, S25FLXXXS_FLAG, 80,
409 { "s25fl256s0", 0x010219, 0x4d00, 256 * 1024, 128,
410 S25FLXXXS_FLAG | FLASH_FLAG_32BIT_ADDR, 80, NULL },
411 { "s25fl256s1", 0x010219, 0x4d01, 64 * 1024, 512,
412 S25FLXXXS_FLAG | FLASH_FLAG_32BIT_ADDR, 80, NULL },
414 /* Winbond -- w25x "blocks" are 64K, "sectors" are 4KiB */
415 #define W25X_FLAG (FLASH_FLAG_READ_WRITE | \
416 FLASH_FLAG_READ_FAST | \
417 FLASH_FLAG_READ_1_1_2 | \
418 FLASH_FLAG_WRITE_1_1_2)
419 { "w25x40", 0xef3013, 0, 64 * 1024, 8, W25X_FLAG, 75, NULL },
420 { "w25x80", 0xef3014, 0, 64 * 1024, 16, W25X_FLAG, 75, NULL },
421 { "w25x16", 0xef3015, 0, 64 * 1024, 32, W25X_FLAG, 75, NULL },
422 { "w25x32", 0xef3016, 0, 64 * 1024, 64, W25X_FLAG, 75, NULL },
423 { "w25x64", 0xef3017, 0, 64 * 1024, 128, W25X_FLAG, 75, NULL },
425 /* Winbond -- w25q "blocks" are 64K, "sectors" are 4KiB */
426 #define W25Q_FLAG (FLASH_FLAG_READ_WRITE | \
427 FLASH_FLAG_READ_FAST | \
428 FLASH_FLAG_READ_1_1_2 | \
429 FLASH_FLAG_READ_1_2_2 | \
430 FLASH_FLAG_READ_1_1_4 | \
431 FLASH_FLAG_READ_1_4_4 | \
432 FLASH_FLAG_WRITE_1_1_4)
433 { "w25q80", 0xef4014, 0, 64 * 1024, 16, W25Q_FLAG, 80, NULL },
434 { "w25q16", 0xef4015, 0, 64 * 1024, 32, W25Q_FLAG, 80, NULL },
435 { "w25q32", 0xef4016, 0, 64 * 1024, 64, W25Q_FLAG, 80, NULL },
436 { "w25q64", 0xef4017, 0, 64 * 1024, 128, W25Q_FLAG, 80, NULL },
439 { NULL, 0x000000, 0, 0, 0, 0, 0, NULL },
443 * FSM message sequence configurations:
445 * All configs are presented in order of preference
448 /* Default READ configurations, in order of preference */
449 static struct seq_rw_config default_read_configs[] = {
450 {FLASH_FLAG_READ_1_4_4, FLASH_CMD_READ_1_4_4, 0, 4, 4, 0x00, 2, 4},
451 {FLASH_FLAG_READ_1_1_4, FLASH_CMD_READ_1_1_4, 0, 1, 4, 0x00, 4, 0},
452 {FLASH_FLAG_READ_1_2_2, FLASH_CMD_READ_1_2_2, 0, 2, 2, 0x00, 4, 0},
453 {FLASH_FLAG_READ_1_1_2, FLASH_CMD_READ_1_1_2, 0, 1, 2, 0x00, 0, 8},
454 {FLASH_FLAG_READ_FAST, FLASH_CMD_READ_FAST, 0, 1, 1, 0x00, 0, 8},
455 {FLASH_FLAG_READ_WRITE, FLASH_CMD_READ, 0, 1, 1, 0x00, 0, 0},
456 {0x00, 0, 0, 0, 0, 0x00, 0, 0},
459 /* Default WRITE configurations */
460 static struct seq_rw_config default_write_configs[] = {
461 {FLASH_FLAG_WRITE_1_4_4, FLASH_CMD_WRITE_1_4_4, 1, 4, 4, 0x00, 0, 0},
462 {FLASH_FLAG_WRITE_1_1_4, FLASH_CMD_WRITE_1_1_4, 1, 1, 4, 0x00, 0, 0},
463 {FLASH_FLAG_WRITE_1_2_2, FLASH_CMD_WRITE_1_2_2, 1, 2, 2, 0x00, 0, 0},
464 {FLASH_FLAG_WRITE_1_1_2, FLASH_CMD_WRITE_1_1_2, 1, 1, 2, 0x00, 0, 0},
465 {FLASH_FLAG_READ_WRITE, FLASH_CMD_WRITE, 1, 1, 1, 0x00, 0, 0},
466 {0x00, 0, 0, 0, 0, 0x00, 0, 0},
470 * [N25Qxxx] Configuration
472 #define N25Q_VCR_DUMMY_CYCLES(x) (((x) & 0xf) << 4)
473 #define N25Q_VCR_XIP_DISABLED ((uint8_t)0x1 << 3)
474 #define N25Q_VCR_WRAP_CONT 0x3
476 /* N25Q 3-byte Address READ configurations
477 * - 'FAST' variants configured for 8 dummy cycles.
479 * Note, the number of dummy cycles used for 'FAST' READ operations is
480 * configurable and would normally be tuned according to the READ command and
481 * operating frequency. However, this applies universally to all 'FAST' READ
482 * commands, including those used by the SPIBoot controller, and remains in
483 * force until the device is power-cycled. Since the SPIBoot controller is
484 * hard-wired to use 8 dummy cycles, we must configure the device to also use 8
487 static struct seq_rw_config n25q_read3_configs[] = {
488 {FLASH_FLAG_READ_1_4_4, FLASH_CMD_READ_1_4_4, 0, 4, 4, 0x00, 0, 8},
489 {FLASH_FLAG_READ_1_1_4, FLASH_CMD_READ_1_1_4, 0, 1, 4, 0x00, 0, 8},
490 {FLASH_FLAG_READ_1_2_2, FLASH_CMD_READ_1_2_2, 0, 2, 2, 0x00, 0, 8},
491 {FLASH_FLAG_READ_1_1_2, FLASH_CMD_READ_1_1_2, 0, 1, 2, 0x00, 0, 8},
492 {FLASH_FLAG_READ_FAST, FLASH_CMD_READ_FAST, 0, 1, 1, 0x00, 0, 8},
493 {FLASH_FLAG_READ_WRITE, FLASH_CMD_READ, 0, 1, 1, 0x00, 0, 0},
494 {0x00, 0, 0, 0, 0, 0x00, 0, 0},
497 /* N25Q 4-byte Address READ configurations
498 * - use special 4-byte address READ commands (reduces overheads, and
499 * reduces risk of hitting watchdog reset issues).
500 * - 'FAST' variants configured for 8 dummy cycles (see note above.)
502 static struct seq_rw_config n25q_read4_configs[] = {
503 {FLASH_FLAG_READ_1_4_4, FLASH_CMD_READ4_1_4_4, 0, 4, 4, 0x00, 0, 8},
504 {FLASH_FLAG_READ_1_1_4, FLASH_CMD_READ4_1_1_4, 0, 1, 4, 0x00, 0, 8},
505 {FLASH_FLAG_READ_1_2_2, FLASH_CMD_READ4_1_2_2, 0, 2, 2, 0x00, 0, 8},
506 {FLASH_FLAG_READ_1_1_2, FLASH_CMD_READ4_1_1_2, 0, 1, 2, 0x00, 0, 8},
507 {FLASH_FLAG_READ_FAST, FLASH_CMD_READ4_FAST, 0, 1, 1, 0x00, 0, 8},
508 {FLASH_FLAG_READ_WRITE, FLASH_CMD_READ4, 0, 1, 1, 0x00, 0, 0},
509 {0x00, 0, 0, 0, 0, 0x00, 0, 0},
512 static struct stfsm_seq stfsm_seq_read; /* Dynamically populated */
513 static struct stfsm_seq stfsm_seq_write; /* Dynamically populated */
514 static struct stfsm_seq stfsm_seq_en_32bit_addr;/* Dynamically populated */
516 static struct stfsm_seq stfsm_seq_read_jedec = {
517 .data_size = TRANSFER_SIZE(8),
518 .seq_opc[0] = (SEQ_OPC_PADS_1 |
520 SEQ_OPC_OPCODE(FLASH_CMD_RDID)),
523 STFSM_INST_DATA_READ,
526 .seq_cfg = (SEQ_CFG_PADS_1 |
527 SEQ_CFG_READNOTWRITE |
532 static struct stfsm_seq stfsm_seq_read_status_fifo = {
533 .data_size = TRANSFER_SIZE(4),
534 .seq_opc[0] = (SEQ_OPC_PADS_1 |
536 SEQ_OPC_OPCODE(FLASH_CMD_RDSR)),
539 STFSM_INST_DATA_READ,
542 .seq_cfg = (SEQ_CFG_PADS_1 |
543 SEQ_CFG_READNOTWRITE |
548 static struct stfsm_seq stfsm_seq_erase_sector = {
549 /* 'addr_cfg' configured during initialisation */
551 (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
552 SEQ_OPC_OPCODE(FLASH_CMD_WREN) | SEQ_OPC_CSDEASSERT),
554 (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
555 SEQ_OPC_OPCODE(FLASH_CMD_SE)),
564 .seq_cfg = (SEQ_CFG_PADS_1 |
565 SEQ_CFG_READNOTWRITE |
570 static struct stfsm_seq stfsm_seq_erase_chip = {
572 (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
573 SEQ_OPC_OPCODE(FLASH_CMD_WREN) | SEQ_OPC_CSDEASSERT),
575 (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
576 SEQ_OPC_OPCODE(FLASH_CMD_CHIPERASE) | SEQ_OPC_CSDEASSERT),
584 .seq_cfg = (SEQ_CFG_PADS_1 |
586 SEQ_CFG_READNOTWRITE |
591 static struct stfsm_seq stfsm_seq_wrvcr = {
592 .seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
593 SEQ_OPC_OPCODE(FLASH_CMD_WREN) | SEQ_OPC_CSDEASSERT),
594 .seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
595 SEQ_OPC_OPCODE(FLASH_CMD_WRVCR)),
602 .seq_cfg = (SEQ_CFG_PADS_1 |
603 SEQ_CFG_READNOTWRITE |
608 static int stfsm_n25q_en_32bit_addr_seq(struct stfsm_seq *seq)
610 seq->seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
611 SEQ_OPC_OPCODE(FLASH_CMD_EN4B_ADDR));
612 seq->seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
613 SEQ_OPC_OPCODE(FLASH_CMD_WREN) |
616 seq->seq[0] = STFSM_INST_CMD2;
617 seq->seq[1] = STFSM_INST_CMD1;
618 seq->seq[2] = STFSM_INST_WAIT;
619 seq->seq[3] = STFSM_INST_STOP;
621 seq->seq_cfg = (SEQ_CFG_PADS_1 |
623 SEQ_CFG_READNOTWRITE |
630 static inline int stfsm_is_idle(struct stfsm *fsm)
632 return readl(fsm->base + SPI_FAST_SEQ_STA) & 0x10;
635 static inline uint32_t stfsm_fifo_available(struct stfsm *fsm)
637 return (readl(fsm->base + SPI_FAST_SEQ_STA) >> 5) & 0x7f;
640 static void stfsm_clear_fifo(struct stfsm *fsm)
645 avail = stfsm_fifo_available(fsm);
650 readl(fsm->base + SPI_FAST_SEQ_DATA_REG);
656 static inline void stfsm_load_seq(struct stfsm *fsm,
657 const struct stfsm_seq *seq)
659 void __iomem *dst = fsm->base + SPI_FAST_SEQ_TRANSFER_SIZE;
660 const uint32_t *src = (const uint32_t *)seq;
661 int words = sizeof(*seq) / sizeof(*src);
663 BUG_ON(!stfsm_is_idle(fsm));
672 static void stfsm_wait_seq(struct stfsm *fsm)
674 unsigned long deadline;
677 deadline = jiffies + msecs_to_jiffies(STFSM_MAX_WAIT_SEQ_MS);
680 if (time_after_eq(jiffies, deadline))
683 if (stfsm_is_idle(fsm))
689 dev_err(fsm->dev, "timeout on sequence completion\n");
692 static void stfsm_read_fifo(struct stfsm *fsm, uint32_t *buf,
695 uint32_t remaining = size >> 2;
699 dev_dbg(fsm->dev, "Reading %d bytes from FIFO\n", size);
701 BUG_ON((((uint32_t)buf) & 0x3) || (size & 0x3));
705 avail = stfsm_fifo_available(fsm);
710 words = min(avail, remaining);
713 readsl(fsm->base + SPI_FAST_SEQ_DATA_REG, buf, words);
718 static int stfsm_write_fifo(struct stfsm *fsm,
719 const uint32_t *buf, const uint32_t size)
721 uint32_t words = size >> 2;
723 dev_dbg(fsm->dev, "writing %d bytes to FIFO\n", size);
725 BUG_ON((((uint32_t)buf) & 0x3) || (size & 0x3));
727 writesl(fsm->base + SPI_FAST_SEQ_DATA_REG, buf, words);
732 static int stfsm_enter_32bit_addr(struct stfsm *fsm, int enter)
734 struct stfsm_seq *seq = &stfsm_seq_en_32bit_addr;
735 uint32_t cmd = enter ? FLASH_CMD_EN4B_ADDR : FLASH_CMD_EX4B_ADDR;
737 seq->seq_opc[0] = (SEQ_OPC_PADS_1 |
739 SEQ_OPC_OPCODE(cmd) |
742 stfsm_load_seq(fsm, seq);
749 static uint8_t stfsm_wait_busy(struct stfsm *fsm)
751 struct stfsm_seq *seq = &stfsm_seq_read_status_fifo;
752 unsigned long deadline;
757 seq->seq_opc[0] = (SEQ_OPC_PADS_1 |
759 SEQ_OPC_OPCODE(FLASH_CMD_RDSR));
761 /* Load read_status sequence */
762 stfsm_load_seq(fsm, seq);
765 * Repeat until busy bit is deasserted, or timeout, or error (S25FLxxxS)
767 deadline = jiffies + FLASH_MAX_BUSY_WAIT;
771 if (time_after_eq(jiffies, deadline))
776 stfsm_read_fifo(fsm, &status, 4);
778 if ((status & FLASH_STATUS_BUSY) == 0)
781 if ((fsm->configuration & CFG_S25FL_CHECK_ERROR_FLAGS) &&
782 ((status & S25FL_STATUS_P_ERR) ||
783 (status & S25FL_STATUS_E_ERR)))
784 return (uint8_t)(status & 0xff);
788 writel(seq->seq_cfg, fsm->base + SPI_FAST_SEQ_CFG);
791 dev_err(fsm->dev, "timeout on wait_busy\n");
793 return FLASH_STATUS_TIMEOUT;
796 static int stfsm_read_status(struct stfsm *fsm, uint8_t cmd,
799 struct stfsm_seq *seq = &stfsm_seq_read_status_fifo;
802 dev_dbg(fsm->dev, "reading STA[%s]\n",
803 (cmd == FLASH_CMD_RDSR) ? "1" : "2");
805 seq->seq_opc[0] = (SEQ_OPC_PADS_1 |
807 SEQ_OPC_OPCODE(cmd)),
809 stfsm_load_seq(fsm, seq);
811 stfsm_read_fifo(fsm, &tmp, 4);
813 *status = (uint8_t)(tmp >> 24);
820 static int stfsm_wrvcr(struct stfsm *fsm, uint8_t data)
822 struct stfsm_seq *seq = &stfsm_seq_wrvcr;
824 dev_dbg(fsm->dev, "writing VCR 0x%02x\n", data);
826 seq->status = (STA_DATA_BYTE1(data) | STA_PADS_1 | STA_CSDEASSERT);
828 stfsm_load_seq(fsm, seq);
836 * SoC reset on 'boot-from-spi' systems
838 * Certain modes of operation cause the Flash device to enter a particular state
839 * for a period of time (e.g. 'Erase Sector', 'Quad Enable', and 'Enter 32-bit
840 * Addr' commands). On boot-from-spi systems, it is important to consider what
841 * happens if a warm reset occurs during this period. The SPIBoot controller
842 * assumes that Flash device is in its default reset state, 24-bit address mode,
843 * and ready to accept commands. This can be achieved using some form of
844 * on-board logic/controller to force a device POR in response to a SoC-level
845 * reset or by making use of the device reset signal if available (limited
846 * number of devices only).
848 * Failure to take such precautions can cause problems following a warm reset.
849 * For some operations (e.g. ERASE), there is little that can be done. For
850 * other modes of operation (e.g. 32-bit addressing), options are often
851 * available that can help minimise the window in which a reset could cause a
855 static bool stfsm_can_handle_soc_reset(struct stfsm *fsm)
857 /* Reset signal is available on the board and supported by the device */
858 if (fsm->reset_signal && fsm->info->flags & FLASH_FLAG_RESET)
861 /* Board-level logic forces a power-on-reset */
865 /* Reset is not properly handled and may result in failure to reboot */
869 /* Configure 'addr_cfg' according to addressing mode */
870 static void stfsm_prepare_erasesec_seq(struct stfsm *fsm,
871 struct stfsm_seq *seq)
873 int addr1_cycles = fsm->info->flags & FLASH_FLAG_32BIT_ADDR ? 16 : 8;
875 seq->addr_cfg = (ADR_CFG_CYCLES_ADD1(addr1_cycles) |
876 ADR_CFG_PADS_1_ADD1 |
877 ADR_CFG_CYCLES_ADD2(16) |
878 ADR_CFG_PADS_1_ADD2 |
879 ADR_CFG_CSDEASSERT_ADD2);
882 /* Search for preferred configuration based on available flags */
883 static struct seq_rw_config *
884 stfsm_search_seq_rw_configs(struct stfsm *fsm,
885 struct seq_rw_config cfgs[])
887 struct seq_rw_config *config;
888 int flags = fsm->info->flags;
890 for (config = cfgs; config->cmd != 0; config++)
891 if ((config->flags & flags) == config->flags)
897 /* Prepare a READ/WRITE sequence according to configuration parameters */
898 static void stfsm_prepare_rw_seq(struct stfsm *fsm,
899 struct stfsm_seq *seq,
900 struct seq_rw_config *cfg)
902 int addr1_cycles, addr2_cycles;
905 memset(seq, 0, sizeof(*seq));
907 /* Add READ/WRITE OPC */
908 seq->seq_opc[i++] = (SEQ_OPC_PADS_1 |
910 SEQ_OPC_OPCODE(cfg->cmd));
912 /* Add WREN OPC for a WRITE sequence */
914 seq->seq_opc[i++] = (SEQ_OPC_PADS_1 |
916 SEQ_OPC_OPCODE(FLASH_CMD_WREN) |
919 /* Address configuration (24 or 32-bit addresses) */
920 addr1_cycles = (fsm->info->flags & FLASH_FLAG_32BIT_ADDR) ? 16 : 8;
921 addr1_cycles /= cfg->addr_pads;
922 addr2_cycles = 16 / cfg->addr_pads;
923 seq->addr_cfg = ((addr1_cycles & 0x3f) << 0 | /* ADD1 cycles */
924 (cfg->addr_pads - 1) << 6 | /* ADD1 pads */
925 (addr2_cycles & 0x3f) << 16 | /* ADD2 cycles */
926 ((cfg->addr_pads - 1) << 22)); /* ADD2 pads */
928 /* Data/Sequence configuration */
929 seq->seq_cfg = ((cfg->data_pads - 1) << 16 |
933 seq->seq_cfg |= SEQ_CFG_READNOTWRITE;
935 /* Mode configuration (no. of pads taken from addr cfg) */
936 seq->mode = ((cfg->mode_data & 0xff) << 0 | /* data */
937 (cfg->mode_cycles & 0x3f) << 16 | /* cycles */
938 (cfg->addr_pads - 1) << 22); /* pads */
940 /* Dummy configuration (no. of pads taken from addr cfg) */
941 seq->dummy = ((cfg->dummy_cycles & 0x3f) << 16 | /* cycles */
942 (cfg->addr_pads - 1) << 22); /* pads */
945 /* Instruction sequence */
948 seq->seq[i++] = STFSM_INST_CMD2;
950 seq->seq[i++] = STFSM_INST_CMD1;
952 seq->seq[i++] = STFSM_INST_ADD1;
953 seq->seq[i++] = STFSM_INST_ADD2;
955 if (cfg->mode_cycles)
956 seq->seq[i++] = STFSM_INST_MODE;
958 if (cfg->dummy_cycles)
959 seq->seq[i++] = STFSM_INST_DUMMY;
962 cfg->write ? STFSM_INST_DATA_WRITE : STFSM_INST_DATA_READ;
963 seq->seq[i++] = STFSM_INST_STOP;
966 static int stfsm_search_prepare_rw_seq(struct stfsm *fsm,
967 struct stfsm_seq *seq,
968 struct seq_rw_config *cfgs)
970 struct seq_rw_config *config;
972 config = stfsm_search_seq_rw_configs(fsm, cfgs);
974 dev_err(fsm->dev, "failed to find suitable config\n");
978 stfsm_prepare_rw_seq(fsm, seq, config);
983 /* Prepare a READ/WRITE/ERASE 'default' sequences */
984 static int stfsm_prepare_rwe_seqs_default(struct stfsm *fsm)
986 uint32_t flags = fsm->info->flags;
989 /* Configure 'READ' sequence */
990 ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read,
991 default_read_configs);
994 "failed to prep READ sequence with flags [0x%08x]\n",
999 /* Configure 'WRITE' sequence */
1000 ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_write,
1001 default_write_configs);
1004 "failed to prep WRITE sequence with flags [0x%08x]\n",
1009 /* Configure 'ERASE_SECTOR' sequence */
1010 stfsm_prepare_erasesec_seq(fsm, &stfsm_seq_erase_sector);
1015 static int stfsm_n25q_config(struct stfsm *fsm)
1017 uint32_t flags = fsm->info->flags;
1022 /* Configure 'READ' sequence */
1023 if (flags & FLASH_FLAG_32BIT_ADDR)
1024 ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read,
1025 n25q_read4_configs);
1027 ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read,
1028 n25q_read3_configs);
1031 "failed to prepare READ sequence with flags [0x%08x]\n",
1036 /* Configure 'WRITE' sequence (default configs) */
1037 ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_write,
1038 default_write_configs);
1041 "preparing WRITE sequence using flags [0x%08x] failed\n",
1046 /* * Configure 'ERASE_SECTOR' sequence */
1047 stfsm_prepare_erasesec_seq(fsm, &stfsm_seq_erase_sector);
1049 /* Configure 32-bit address support */
1050 if (flags & FLASH_FLAG_32BIT_ADDR) {
1051 stfsm_n25q_en_32bit_addr_seq(&stfsm_seq_en_32bit_addr);
1053 soc_reset = stfsm_can_handle_soc_reset(fsm);
1054 if (soc_reset || !fsm->booted_from_spi) {
1056 * If we can handle SoC resets, we enable 32-bit
1057 * address mode pervasively
1059 stfsm_enter_32bit_addr(fsm, 1);
1062 * If not, enable/disable for WRITE and ERASE
1063 * operations (READ uses special commands)
1065 fsm->configuration = (CFG_WRITE_TOGGLE_32BIT_ADDR |
1066 CFG_ERASESEC_TOGGLE_32BIT_ADDR);
1071 * Configure device to use 8 dummy cycles
1073 vcr = (N25Q_VCR_DUMMY_CYCLES(8) | N25Q_VCR_XIP_DISABLED |
1074 N25Q_VCR_WRAP_CONT);
1075 stfsm_wrvcr(fsm, vcr);
1080 static int stfsm_read(struct stfsm *fsm, uint8_t *buf, uint32_t size,
1083 struct stfsm_seq *seq = &stfsm_seq_read;
1090 uint32_t page_buf[FLASH_PAGESIZE_32];
1093 dev_dbg(fsm->dev, "reading %d bytes from 0x%08x\n", size, offset);
1095 /* Enter 32-bit address mode, if required */
1096 if (fsm->configuration & CFG_READ_TOGGLE_32BIT_ADDR)
1097 stfsm_enter_32bit_addr(fsm, 1);
1099 /* Must read in multiples of 32 cycles (or 32*pads/8 Bytes) */
1100 data_pads = ((seq->seq_cfg >> 16) & 0x3) + 1;
1101 read_mask = (data_pads << 2) - 1;
1103 /* Handle non-aligned buf */
1104 p = ((uint32_t)buf & 0x3) ? (uint8_t *)page_buf : buf;
1106 /* Handle non-aligned size */
1107 size_ub = (size + read_mask) & ~read_mask;
1108 size_lb = size & ~read_mask;
1109 size_mop = size & read_mask;
1111 seq->data_size = TRANSFER_SIZE(size_ub);
1112 seq->addr1 = (offset >> 16) & 0xffff;
1113 seq->addr2 = offset & 0xffff;
1115 stfsm_load_seq(fsm, seq);
1118 stfsm_read_fifo(fsm, (uint32_t *)p, size_lb);
1121 stfsm_read_fifo(fsm, tmp, read_mask + 1);
1122 memcpy(p + size_lb, &tmp, size_mop);
1125 /* Handle non-aligned buf */
1126 if ((uint32_t)buf & 0x3)
1127 memcpy(buf, page_buf, size);
1129 /* Wait for sequence to finish */
1130 stfsm_wait_seq(fsm);
1132 stfsm_clear_fifo(fsm);
1134 /* Exit 32-bit address mode, if required */
1135 if (fsm->configuration & CFG_READ_TOGGLE_32BIT_ADDR)
1136 stfsm_enter_32bit_addr(fsm, 0);
1141 static int stfsm_write(struct stfsm *fsm, const uint8_t *const buf,
1142 const uint32_t size, const uint32_t offset)
1144 struct stfsm_seq *seq = &stfsm_seq_write;
1146 uint32_t write_mask;
1151 uint32_t page_buf[FLASH_PAGESIZE_32];
1152 uint8_t *t = (uint8_t *)&tmp;
1157 dev_dbg(fsm->dev, "writing %d bytes to 0x%08x\n", size, offset);
1159 /* Enter 32-bit address mode, if required */
1160 if (fsm->configuration & CFG_WRITE_TOGGLE_32BIT_ADDR)
1161 stfsm_enter_32bit_addr(fsm, 1);
1163 /* Must write in multiples of 32 cycles (or 32*pads/8 bytes) */
1164 data_pads = ((seq->seq_cfg >> 16) & 0x3) + 1;
1165 write_mask = (data_pads << 2) - 1;
1167 /* Handle non-aligned buf */
1168 if ((uint32_t)buf & 0x3) {
1169 memcpy(page_buf, buf, size);
1170 p = (uint8_t *)page_buf;
1175 /* Handle non-aligned size */
1176 size_ub = (size + write_mask) & ~write_mask;
1177 size_lb = size & ~write_mask;
1178 size_mop = size & write_mask;
1180 seq->data_size = TRANSFER_SIZE(size_ub);
1181 seq->addr1 = (offset >> 16) & 0xffff;
1182 seq->addr2 = offset & 0xffff;
1184 /* Need to set FIFO to write mode, before writing data to FIFO (see
1187 writel(0x00040000, fsm->base + SPI_FAST_SEQ_CFG);
1190 * Before writing data to the FIFO, apply a small delay to allow a
1191 * potential change of FIFO direction to complete.
1193 if (fsm->fifo_dir_delay == 0)
1194 readl(fsm->base + SPI_FAST_SEQ_CFG);
1196 udelay(fsm->fifo_dir_delay);
1199 /* Write data to FIFO, before starting sequence (see GNBvd79593) */
1201 stfsm_write_fifo(fsm, (uint32_t *)p, size_lb);
1205 /* Handle non-aligned size */
1207 memset(t, 0xff, write_mask + 1); /* fill with 0xff's */
1208 for (i = 0; i < size_mop; i++)
1211 stfsm_write_fifo(fsm, tmp, write_mask + 1);
1214 /* Start sequence */
1215 stfsm_load_seq(fsm, seq);
1217 /* Wait for sequence to finish */
1218 stfsm_wait_seq(fsm);
1220 /* Wait for completion */
1221 ret = stfsm_wait_busy(fsm);
1223 /* Exit 32-bit address mode, if required */
1224 if (fsm->configuration & CFG_WRITE_TOGGLE_32BIT_ADDR) {
1225 stfsm_enter_32bit_addr(fsm, 0);
1226 if (fsm->configuration & CFG_WRITE_EX_32BIT_ADDR_DELAY)
1234 * Read an address range from the flash chip. The address range
1235 * may be any size provided it is within the physical boundaries.
1237 static int stfsm_mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
1238 size_t *retlen, u_char *buf)
1240 struct stfsm *fsm = dev_get_drvdata(mtd->dev.parent);
1243 dev_dbg(fsm->dev, "%s from 0x%08x, len %zd\n",
1244 __func__, (u32)from, len);
1246 mutex_lock(&fsm->lock);
1249 bytes = min_t(size_t, len, FLASH_PAGESIZE);
1251 stfsm_read(fsm, buf, bytes, from);
1260 mutex_unlock(&fsm->lock);
1265 static int stfsm_erase_sector(struct stfsm *fsm, const uint32_t offset)
1267 struct stfsm_seq *seq = &stfsm_seq_erase_sector;
1270 dev_dbg(fsm->dev, "erasing sector at 0x%08x\n", offset);
1272 /* Enter 32-bit address mode, if required */
1273 if (fsm->configuration & CFG_ERASESEC_TOGGLE_32BIT_ADDR)
1274 stfsm_enter_32bit_addr(fsm, 1);
1276 seq->addr1 = (offset >> 16) & 0xffff;
1277 seq->addr2 = offset & 0xffff;
1279 stfsm_load_seq(fsm, seq);
1281 stfsm_wait_seq(fsm);
1283 /* Wait for completion */
1284 ret = stfsm_wait_busy(fsm);
1286 /* Exit 32-bit address mode, if required */
1287 if (fsm->configuration & CFG_ERASESEC_TOGGLE_32BIT_ADDR)
1288 stfsm_enter_32bit_addr(fsm, 0);
1293 static int stfsm_erase_chip(struct stfsm *fsm)
1295 const struct stfsm_seq *seq = &stfsm_seq_erase_chip;
1297 dev_dbg(fsm->dev, "erasing chip\n");
1299 stfsm_load_seq(fsm, seq);
1301 stfsm_wait_seq(fsm);
1303 return stfsm_wait_busy(fsm);
1307 * Write an address range to the flash chip. Data must be written in
1308 * FLASH_PAGESIZE chunks. The address range may be any size provided
1309 * it is within the physical boundaries.
1311 static int stfsm_mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
1312 size_t *retlen, const u_char *buf)
1314 struct stfsm *fsm = dev_get_drvdata(mtd->dev.parent);
1318 uint8_t *b = (uint8_t *)buf;
1321 dev_dbg(fsm->dev, "%s to 0x%08x, len %zd\n", __func__, (u32)to, len);
1328 if (to + len > mtd->size)
1331 /* Offset within page */
1332 page_offs = to % FLASH_PAGESIZE;
1334 mutex_lock(&fsm->lock);
1337 /* Write up to page boundary */
1338 bytes = min(FLASH_PAGESIZE - page_offs, len);
1340 ret = stfsm_write(fsm, b, bytes, to);
1348 /* We are now page-aligned */
1356 mutex_unlock(&fsm->lock);
1362 * Erase an address range on the flash chip. The address range may extend
1363 * one or more erase sectors. Return an error is there is a problem erasing.
1365 static int stfsm_mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
1367 struct stfsm *fsm = dev_get_drvdata(mtd->dev.parent);
1371 dev_dbg(fsm->dev, "%s at 0x%llx, len %lld\n", __func__,
1372 (long long)instr->addr, (long long)instr->len);
1377 mutex_lock(&fsm->lock);
1379 /* Whole-chip erase? */
1380 if (len == mtd->size) {
1381 ret = stfsm_erase_chip(fsm);
1386 ret = stfsm_erase_sector(fsm, addr);
1390 addr += mtd->erasesize;
1391 len -= mtd->erasesize;
1395 mutex_unlock(&fsm->lock);
1397 instr->state = MTD_ERASE_DONE;
1398 mtd_erase_callback(instr);
1403 instr->state = MTD_ERASE_FAILED;
1404 mutex_unlock(&fsm->lock);
1409 static void stfsm_read_jedec(struct stfsm *fsm, uint8_t *const jedec)
1411 const struct stfsm_seq *seq = &stfsm_seq_read_jedec;
1414 stfsm_load_seq(fsm, seq);
1416 stfsm_read_fifo(fsm, tmp, 8);
1418 memcpy(jedec, tmp, 5);
1420 stfsm_wait_seq(fsm);
1423 static struct flash_info *stfsm_jedec_probe(struct stfsm *fsm)
1425 struct flash_info *info;
1430 stfsm_read_jedec(fsm, id);
1432 jedec = id[0] << 16 | id[1] << 8 | id[2];
1434 * JEDEC also defines an optional "extended device information"
1435 * string for after vendor-specific data, after the three bytes
1436 * we use here. Supporting some chips might require using it.
1438 ext_jedec = id[3] << 8 | id[4];
1440 dev_dbg(fsm->dev, "JEDEC = 0x%08x [%02x %02x %02x %02x %02x]\n",
1441 jedec, id[0], id[1], id[2], id[3], id[4]);
1443 for (info = flash_types; info->name; info++) {
1444 if (info->jedec_id == jedec) {
1445 if (info->ext_id && info->ext_id != ext_jedec)
1450 dev_err(fsm->dev, "Unrecognized JEDEC id %06x\n", jedec);
1455 static int stfsm_set_mode(struct stfsm *fsm, uint32_t mode)
1457 int ret, timeout = 10;
1459 /* Wait for controller to accept mode change */
1461 ret = readl(fsm->base + SPI_STA_MODE_CHANGE);
1470 writel(mode, fsm->base + SPI_MODESELECT);
1475 static void stfsm_set_freq(struct stfsm *fsm, uint32_t spi_freq)
1480 /* TODO: Make this dynamic */
1481 emi_freq = STFSM_DEFAULT_EMI_FREQ;
1484 * Calculate clk_div - values between 2 and 128
1485 * Multiple of 2, rounded up
1487 clk_div = 2 * DIV_ROUND_UP(emi_freq, 2 * spi_freq);
1490 else if (clk_div > 128)
1494 * Determine a suitable delay for the IP to complete a change of
1495 * direction of the FIFO. The required delay is related to the clock
1496 * divider used. The following heuristics are based on empirical tests,
1497 * using a 100MHz EMI clock.
1500 fsm->fifo_dir_delay = 0;
1501 else if (clk_div <= 10)
1502 fsm->fifo_dir_delay = 1;
1504 fsm->fifo_dir_delay = DIV_ROUND_UP(clk_div, 10);
1506 dev_dbg(fsm->dev, "emi_clk = %uHZ, spi_freq = %uHZ, clk_div = %u\n",
1507 emi_freq, spi_freq, clk_div);
1509 writel(clk_div, fsm->base + SPI_CLOCKDIV);
1512 static int stfsm_init(struct stfsm *fsm)
1516 /* Perform a soft reset of the FSM controller */
1517 writel(SEQ_CFG_SWRESET, fsm->base + SPI_FAST_SEQ_CFG);
1519 writel(0, fsm->base + SPI_FAST_SEQ_CFG);
1521 /* Set clock to 'safe' frequency initially */
1522 stfsm_set_freq(fsm, STFSM_FLASH_SAFE_FREQ);
1525 ret = stfsm_set_mode(fsm, SPI_MODESELECT_FSM);
1529 /* Set timing parameters */
1530 writel(SPI_CFG_DEVICE_ST |
1531 SPI_CFG_DEFAULT_MIN_CS_HIGH |
1532 SPI_CFG_DEFAULT_CS_SETUPHOLD |
1533 SPI_CFG_DEFAULT_DATA_HOLD,
1534 fsm->base + SPI_CONFIGDATA);
1535 writel(STFSM_DEFAULT_WR_TIME, fsm->base + SPI_STATUS_WR_TIME_REG);
1537 /* Clear FIFO, just in case */
1538 stfsm_clear_fifo(fsm);
1543 static void stfsm_fetch_platform_configs(struct platform_device *pdev)
1545 struct stfsm *fsm = platform_get_drvdata(pdev);
1546 struct device_node *np = pdev->dev.of_node;
1547 struct regmap *regmap;
1548 uint32_t boot_device_reg;
1549 uint32_t boot_device_spi;
1550 uint32_t boot_device; /* Value we read from *boot_device_reg */
1553 /* Booting from SPI NOR Flash is the default */
1554 fsm->booted_from_spi = true;
1556 regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
1558 goto boot_device_fail;
1560 fsm->reset_signal = of_property_read_bool(np, "st,reset-signal");
1562 fsm->reset_por = of_property_read_bool(np, "st,reset-por");
1564 /* Where in the syscon the boot device information lives */
1565 ret = of_property_read_u32(np, "st,boot-device-reg", &boot_device_reg);
1567 goto boot_device_fail;
1569 /* Boot device value when booted from SPI NOR */
1570 ret = of_property_read_u32(np, "st,boot-device-spi", &boot_device_spi);
1572 goto boot_device_fail;
1574 ret = regmap_read(regmap, boot_device_reg, &boot_device);
1576 goto boot_device_fail;
1578 if (boot_device != boot_device_spi)
1579 fsm->booted_from_spi = false;
1584 dev_warn(&pdev->dev,
1585 "failed to fetch boot device, assuming boot from SPI\n");
1588 static int stfsm_probe(struct platform_device *pdev)
1590 struct device_node *np = pdev->dev.of_node;
1591 struct flash_info *info;
1592 struct resource *res;
1597 dev_err(&pdev->dev, "No DT found\n");
1601 fsm = devm_kzalloc(&pdev->dev, sizeof(*fsm), GFP_KERNEL);
1605 fsm->dev = &pdev->dev;
1607 platform_set_drvdata(pdev, fsm);
1609 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1611 dev_err(&pdev->dev, "Resource not found\n");
1615 fsm->base = devm_ioremap_resource(&pdev->dev, res);
1616 if (IS_ERR(fsm->base)) {
1618 "Failed to reserve memory region %pR\n", res);
1619 return PTR_ERR(fsm->base);
1622 mutex_init(&fsm->lock);
1624 ret = stfsm_init(fsm);
1626 dev_err(&pdev->dev, "Failed to initialise FSM Controller\n");
1630 stfsm_fetch_platform_configs(pdev);
1632 /* Detect SPI FLASH device */
1633 info = stfsm_jedec_probe(fsm);
1638 /* Use device size to determine address width */
1639 if (info->sector_size * info->n_sectors > 0x1000000)
1640 info->flags |= FLASH_FLAG_32BIT_ADDR;
1643 * Configure READ/WRITE/ERASE sequences according to platform and
1647 ret = info->config(fsm);
1651 ret = stfsm_prepare_rwe_seqs_default(fsm);
1656 fsm->mtd.dev.parent = &pdev->dev;
1657 fsm->mtd.type = MTD_NORFLASH;
1658 fsm->mtd.writesize = 4;
1659 fsm->mtd.writebufsize = fsm->mtd.writesize;
1660 fsm->mtd.flags = MTD_CAP_NORFLASH;
1661 fsm->mtd.size = info->sector_size * info->n_sectors;
1662 fsm->mtd.erasesize = info->sector_size;
1664 fsm->mtd._read = stfsm_mtd_read;
1665 fsm->mtd._write = stfsm_mtd_write;
1666 fsm->mtd._erase = stfsm_mtd_erase;
1668 dev_info(&pdev->dev,
1669 "Found serial flash device: %s\n"
1670 " size = %llx (%lldMiB) erasesize = 0x%08x (%uKiB)\n",
1672 (long long)fsm->mtd.size, (long long)(fsm->mtd.size >> 20),
1673 fsm->mtd.erasesize, (fsm->mtd.erasesize >> 10));
1675 return mtd_device_parse_register(&fsm->mtd, NULL, NULL, NULL, 0);
1678 static int stfsm_remove(struct platform_device *pdev)
1680 struct stfsm *fsm = platform_get_drvdata(pdev);
1683 err = mtd_device_unregister(&fsm->mtd);
1690 static struct of_device_id stfsm_match[] = {
1691 { .compatible = "st,spi-fsm", },
1694 MODULE_DEVICE_TABLE(of, stfsm_match);
1696 static struct platform_driver stfsm_driver = {
1697 .probe = stfsm_probe,
1698 .remove = stfsm_remove,
1700 .name = "st-spi-fsm",
1701 .owner = THIS_MODULE,
1702 .of_match_table = stfsm_match,
1705 module_platform_driver(stfsm_driver);
1707 MODULE_AUTHOR("Angus Clark <angus.clark@st.com>");
1708 MODULE_DESCRIPTION("ST SPI FSM driver");
1709 MODULE_LICENSE("GPL");