4 * Copyright (C) 2008 Atmel Corporation
5 * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
7 * Licensed under the GPL-2 or later.
13 #include <spi_flash.h>
15 #include "spi_flash_internal.h"
17 static void spi_flash_addr(u32 addr, u8 *cmd)
19 /* cmd[0] is actual command */
25 static int spi_flash_read_write(struct spi_slave *spi,
26 const u8 *cmd, size_t cmd_len,
27 const u8 *data_out, u8 *data_in,
30 unsigned long flags = SPI_XFER_BEGIN;
34 flags |= SPI_XFER_END;
36 ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
38 debug("SF: Failed to send command (%zu bytes): %d\n",
40 } else if (data_len != 0) {
41 ret = spi_xfer(spi, data_len * 8, data_out, data_in, SPI_XFER_END);
43 debug("SF: Failed to transfer %zu bytes of data: %d\n",
50 int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
52 return spi_flash_cmd_read(spi, &cmd, 1, response, len);
55 int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
56 size_t cmd_len, void *data, size_t data_len)
58 return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len);
61 int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
62 const void *data, size_t data_len)
64 return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len);
67 int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
68 size_t cmd_len, void *data, size_t data_len)
70 struct spi_slave *spi = flash->spi;
74 ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len);
80 int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
81 size_t len, void *data)
85 cmd[0] = CMD_READ_ARRAY_FAST;
86 spi_flash_addr(offset, cmd);
89 return spi_flash_read_common(flash, cmd, sizeof(cmd), data, len);
92 int spi_flash_cmd_poll_bit(struct spi_flash *flash, unsigned long timeout,
95 struct spi_slave *spi = flash->spi;
96 unsigned long timebase;
100 ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN);
102 debug("SF: Failed to send command %02x: %d\n", cmd, ret);
106 timebase = get_timer(0);
108 ret = spi_xfer(spi, 8, NULL, &status, 0);
112 if ((status & poll_bit) == 0)
115 } while (get_timer(timebase) < timeout);
117 spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
119 if ((status & poll_bit) == 0)
123 debug("SF: time out!\n");
127 int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
129 return spi_flash_cmd_poll_bit(flash, timeout,
130 CMD_READ_STATUS, STATUS_WIP);
133 int spi_flash_cmd_erase(struct spi_flash *flash, u8 erase_cmd,
134 u32 offset, size_t len)
136 u32 start, end, erase_size;
140 erase_size = flash->sector_size;
141 if (offset % erase_size || len % erase_size) {
142 debug("SF: Erase offset/length not multiple of erase size\n");
146 ret = spi_claim_bus(flash->spi);
148 debug("SF: Unable to claim SPI bus\n");
156 while (offset < end) {
157 spi_flash_addr(offset, cmd);
158 offset += erase_size;
160 debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
161 cmd[2], cmd[3], offset);
163 ret = spi_flash_cmd(flash->spi, CMD_WRITE_ENABLE, NULL, 0);
167 ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), NULL, 0);
171 ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
176 debug("SF: Successfully erased %lu bytes @ %#x\n",
177 len * erase_size, start);
180 spi_release_bus(flash->spi);
185 * The following table holds all device probe functions
187 * shift: number of continuation bytes before the ID
188 * idcode: the expected IDCODE or 0xff for non JEDEC devices
189 * probe: the function to call
191 * Non JEDEC devices should be ordered in the table such that
192 * the probe functions with best detection algorithms come first.
194 * Several matching entries are permitted, they will be tried
195 * in sequence until a probe function returns non NULL.
197 * IDCODE_CONT_LEN may be redefined if a device needs to declare a
198 * larger "shift" value. IDCODE_PART_LEN generally shouldn't be
199 * changed. This is the max number of bytes probe functions may
200 * examine when looking up part-specific identification info.
202 * Probe functions will be given the idcode buffer starting at their
203 * manu id byte (the "idcode" in the table below). In other words,
204 * all of the continuation bytes will be skipped (the "shift" below).
206 #define IDCODE_CONT_LEN 0
207 #define IDCODE_PART_LEN 5
208 static const struct {
211 struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode);
213 /* Keep it sorted by define name */
214 #ifdef CONFIG_SPI_FLASH_ATMEL
215 { 0, 0x1f, spi_flash_probe_atmel, },
217 #ifdef CONFIG_SPI_FLASH_EON
218 { 0, 0x1c, spi_flash_probe_eon, },
220 #ifdef CONFIG_SPI_FLASH_MACRONIX
221 { 0, 0xc2, spi_flash_probe_macronix, },
223 #ifdef CONFIG_SPI_FLASH_SPANSION
224 { 0, 0x01, spi_flash_probe_spansion, },
226 #ifdef CONFIG_SPI_FLASH_SST
227 { 0, 0xbf, spi_flash_probe_sst, },
229 #ifdef CONFIG_SPI_FLASH_STMICRO
230 { 0, 0x20, spi_flash_probe_stmicro, },
232 #ifdef CONFIG_SPI_FLASH_WINBOND
233 { 0, 0xef, spi_flash_probe_winbond, },
235 #ifdef CONFIG_SPI_FRAM_RAMTRON
236 { 6, 0xc2, spi_fram_probe_ramtron, },
237 # undef IDCODE_CONT_LEN
238 # define IDCODE_CONT_LEN 6
240 /* Keep it sorted by best detection */
241 #ifdef CONFIG_SPI_FLASH_STMICRO
242 { 0, 0xff, spi_flash_probe_stmicro, },
244 #ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
245 { 0, 0xff, spi_fram_probe_ramtron, },
248 #define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN)
250 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
251 unsigned int max_hz, unsigned int spi_mode)
253 struct spi_slave *spi;
254 struct spi_flash *flash = NULL;
256 u8 idcode[IDCODE_LEN], *idp;
258 spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
260 printf("SF: Failed to set up slave\n");
264 ret = spi_claim_bus(spi);
266 debug("SF: Failed to claim SPI bus: %d\n", ret);
270 /* Read the ID codes */
271 ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode));
276 printf("SF: Got idcodes\n");
277 print_buffer(0, idcode, 1, sizeof(idcode), 0);
280 /* count the number of continuation bytes */
281 for (shift = 0, idp = idcode;
282 shift < IDCODE_CONT_LEN && *idp == 0x7f;
286 /* search the table for matches in shift and id */
287 for (i = 0; i < ARRAY_SIZE(flashes); ++i)
288 if (flashes[i].shift == shift && flashes[i].idcode == *idp) {
289 /* we have a match, call probe */
290 flash = flashes[i].probe(spi, idp);
296 printf("SF: Unsupported manufacturer %02x\n", *idp);
297 goto err_manufacturer_probe;
300 printf("SF: Detected %s with page size ", flash->name);
301 print_size(flash->sector_size, ", total ");
302 print_size(flash->size, "\n");
304 spi_release_bus(spi);
308 err_manufacturer_probe:
310 spi_release_bus(spi);
316 void spi_flash_free(struct spi_flash *flash)
318 spi_free_slave(flash->spi);