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>
16 #include "spi_flash_internal.h"
18 static void spi_flash_addr(u32 addr, u8 *cmd)
20 /* cmd[0] is actual command */
26 static int spi_flash_read_write(struct spi_slave *spi,
27 const u8 *cmd, size_t cmd_len,
28 const u8 *data_out, u8 *data_in,
31 unsigned long flags = SPI_XFER_BEGIN;
35 flags |= SPI_XFER_END;
37 ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
39 debug("SF: Failed to send command (%zu bytes): %d\n",
41 } else if (data_len != 0) {
42 ret = spi_xfer(spi, data_len * 8, data_out, data_in, SPI_XFER_END);
44 debug("SF: Failed to transfer %zu bytes of data: %d\n",
51 int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
53 return spi_flash_cmd_read(spi, &cmd, 1, response, len);
56 int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
57 size_t cmd_len, void *data, size_t data_len)
59 return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len);
62 int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
63 const void *data, size_t data_len)
65 return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len);
68 int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
69 size_t cmd_len, void *data, size_t data_len)
71 struct spi_slave *spi = flash->spi;
75 ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len);
81 int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
82 size_t len, void *data)
86 cmd[0] = CMD_READ_ARRAY_FAST;
87 spi_flash_addr(offset, cmd);
90 return spi_flash_read_common(flash, cmd, sizeof(cmd), data, len);
93 int spi_flash_cmd_poll_bit(struct spi_flash *flash, unsigned long timeout,
96 struct spi_slave *spi = flash->spi;
97 unsigned long timebase;
101 ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN);
103 debug("SF: Failed to send command %02x: %d\n", cmd, ret);
107 timebase = get_timer(0);
111 ret = spi_xfer(spi, 8, NULL, &status, 0);
115 if ((status & poll_bit) == 0)
118 } while (get_timer(timebase) < timeout);
120 spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
122 if ((status & poll_bit) == 0)
126 debug("SF: time out!\n");
130 int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
132 return spi_flash_cmd_poll_bit(flash, timeout,
133 CMD_READ_STATUS, STATUS_WIP);
136 int spi_flash_cmd_erase(struct spi_flash *flash, u8 erase_cmd,
137 u32 offset, size_t len)
139 u32 start, end, erase_size;
143 erase_size = flash->sector_size;
144 if (offset % erase_size || len % erase_size) {
145 debug("SF: Erase offset/length not multiple of erase size\n");
149 ret = spi_claim_bus(flash->spi);
151 debug("SF: Unable to claim SPI bus\n");
159 while (offset < end) {
160 spi_flash_addr(offset, cmd);
161 offset += erase_size;
163 debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
164 cmd[2], cmd[3], offset);
166 ret = spi_flash_cmd_write_enable(flash);
170 ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), NULL, 0);
174 ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
179 debug("SF: Successfully erased %lu bytes @ %#x\n",
180 len * erase_size, start);
183 spi_release_bus(flash->spi);
188 * The following table holds all device probe functions
190 * shift: number of continuation bytes before the ID
191 * idcode: the expected IDCODE or 0xff for non JEDEC devices
192 * probe: the function to call
194 * Non JEDEC devices should be ordered in the table such that
195 * the probe functions with best detection algorithms come first.
197 * Several matching entries are permitted, they will be tried
198 * in sequence until a probe function returns non NULL.
200 * IDCODE_CONT_LEN may be redefined if a device needs to declare a
201 * larger "shift" value. IDCODE_PART_LEN generally shouldn't be
202 * changed. This is the max number of bytes probe functions may
203 * examine when looking up part-specific identification info.
205 * Probe functions will be given the idcode buffer starting at their
206 * manu id byte (the "idcode" in the table below). In other words,
207 * all of the continuation bytes will be skipped (the "shift" below).
209 #define IDCODE_CONT_LEN 0
210 #define IDCODE_PART_LEN 5
211 static const struct {
214 struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode);
216 /* Keep it sorted by define name */
217 #ifdef CONFIG_SPI_FLASH_ATMEL
218 { 0, 0x1f, spi_flash_probe_atmel, },
220 #ifdef CONFIG_SPI_FLASH_EON
221 { 0, 0x1c, spi_flash_probe_eon, },
223 #ifdef CONFIG_SPI_FLASH_MACRONIX
224 { 0, 0xc2, spi_flash_probe_macronix, },
226 #ifdef CONFIG_SPI_FLASH_SPANSION
227 { 0, 0x01, spi_flash_probe_spansion, },
229 #ifdef CONFIG_SPI_FLASH_SST
230 { 0, 0xbf, spi_flash_probe_sst, },
232 #ifdef CONFIG_SPI_FLASH_STMICRO
233 { 0, 0x20, spi_flash_probe_stmicro, },
235 #ifdef CONFIG_SPI_FLASH_WINBOND
236 { 0, 0xef, spi_flash_probe_winbond, },
238 #ifdef CONFIG_SPI_FRAM_RAMTRON
239 { 6, 0xc2, spi_fram_probe_ramtron, },
240 # undef IDCODE_CONT_LEN
241 # define IDCODE_CONT_LEN 6
243 /* Keep it sorted by best detection */
244 #ifdef CONFIG_SPI_FLASH_STMICRO
245 { 0, 0xff, spi_flash_probe_stmicro, },
247 #ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
248 { 0, 0xff, spi_fram_probe_ramtron, },
251 #define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN)
253 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
254 unsigned int max_hz, unsigned int spi_mode)
256 struct spi_slave *spi;
257 struct spi_flash *flash = NULL;
259 u8 idcode[IDCODE_LEN], *idp;
261 spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
263 printf("SF: Failed to set up slave\n");
267 ret = spi_claim_bus(spi);
269 debug("SF: Failed to claim SPI bus: %d\n", ret);
273 /* Read the ID codes */
274 ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode));
279 printf("SF: Got idcodes\n");
280 print_buffer(0, idcode, 1, sizeof(idcode), 0);
283 /* count the number of continuation bytes */
284 for (shift = 0, idp = idcode;
285 shift < IDCODE_CONT_LEN && *idp == 0x7f;
289 /* search the table for matches in shift and id */
290 for (i = 0; i < ARRAY_SIZE(flashes); ++i)
291 if (flashes[i].shift == shift && flashes[i].idcode == *idp) {
292 /* we have a match, call probe */
293 flash = flashes[i].probe(spi, idp);
299 printf("SF: Unsupported manufacturer %02x\n", *idp);
300 goto err_manufacturer_probe;
303 printf("SF: Detected %s with page size ", flash->name);
304 print_size(flash->sector_size, ", total ");
305 print_size(flash->size, "\n");
307 spi_release_bus(spi);
311 err_manufacturer_probe:
313 spi_release_bus(spi);
319 void spi_flash_free(struct spi_flash *flash)
321 spi_free_slave(flash->spi);