2 * Driver for SST serial flashes
4 * (C) Copyright 2000-2002
5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
6 * Copyright 2008, Network Appliance Inc.
7 * Jason McMullan <mcmullan@netapp.com>
8 * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
9 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
10 * Copyright (c) 2008-2009 Analog Devices Inc.
12 * Licensed under the GPL-2 or later.
17 #include <spi_flash.h>
19 #include "spi_flash_internal.h"
21 #define CMD_SST_WREN 0x06 /* Write Enable */
22 #define CMD_SST_WRDI 0x04 /* Write Disable */
23 #define CMD_SST_RDSR 0x05 /* Read Status Register */
24 #define CMD_SST_WRSR 0x01 /* Write Status Register */
25 #define CMD_SST_READ 0x03 /* Read Data Bytes */
26 #define CMD_SST_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */
27 #define CMD_SST_BP 0x02 /* Byte Program */
28 #define CMD_SST_AAI_WP 0xAD /* Auto Address Increment Word Program */
29 #define CMD_SST_SE 0x20 /* Sector Erase */
31 #define SST_SR_WIP (1 << 0) /* Write-in-Progress */
32 #define SST_SR_WEL (1 << 1) /* Write enable */
33 #define SST_SR_BP0 (1 << 2) /* Block Protection 0 */
34 #define SST_SR_BP1 (1 << 3) /* Block Protection 1 */
35 #define SST_SR_BP2 (1 << 4) /* Block Protection 2 */
36 #define SST_SR_AAI (1 << 6) /* Addressing mode */
37 #define SST_SR_BPL (1 << 7) /* BP bits lock */
39 struct sst_spi_flash_params {
45 struct sst_spi_flash {
46 struct spi_flash flash;
47 const struct sst_spi_flash_params *params;
50 static inline struct sst_spi_flash *to_sst_spi_flash(struct spi_flash *flash)
52 return container_of(flash, struct sst_spi_flash, flash);
55 #define SST_SECTOR_SIZE (4 * 1024)
56 static const struct sst_spi_flash_params sst_spi_flash_table[] = {
77 sst_wait_ready(struct spi_flash *flash, unsigned long timeout)
79 struct spi_slave *spi = flash->spi;
80 unsigned long timebase;
82 u8 byte = CMD_SST_RDSR;
84 ret = spi_xfer(spi, sizeof(byte) * 8, &byte, NULL, SPI_XFER_BEGIN);
86 debug("SF: Failed to send command %02x: %d\n", byte, ret);
90 timebase = get_timer(0);
92 ret = spi_xfer(spi, sizeof(byte) * 8, NULL, &byte, 0);
96 if ((byte & SST_SR_WIP) == 0)
99 } while (get_timer(timebase) < timeout);
101 spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
103 if (!ret && (byte & SST_SR_WIP) != 0)
107 debug("SF: sst wait for ready timed out\n");
112 sst_enable_writing(struct spi_flash *flash)
114 int ret = spi_flash_cmd(flash->spi, CMD_SST_WREN, NULL, 0);
116 debug("SF: Enabling Write failed\n");
121 sst_disable_writing(struct spi_flash *flash)
123 int ret = spi_flash_cmd(flash->spi, CMD_SST_WRDI, NULL, 0);
125 debug("SF: Disabling Write failed\n");
130 sst_read_fast(struct spi_flash *flash, u32 offset, size_t len, void *buf)
139 return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
143 sst_byte_write(struct spi_flash *flash, u32 offset, const void *buf)
153 debug("BP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
154 spi_w8r8(flash->spi, CMD_SST_RDSR), buf, cmd[0], offset);
156 ret = sst_enable_writing(flash);
160 ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), buf, 1);
164 return sst_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
168 sst_write(struct spi_flash *flash, u32 offset, size_t len, const void *buf)
170 size_t actual, cmd_len;
174 ret = spi_claim_bus(flash->spi);
176 debug("SF: Unable to claim SPI bus\n");
180 /* If the data is not word aligned, write out leading single byte */
183 ret = sst_byte_write(flash, offset, buf);
189 ret = sst_enable_writing(flash);
194 cmd[0] = CMD_SST_AAI_WP;
195 cmd[1] = offset >> 16;
196 cmd[2] = offset >> 8;
199 for (; actual < len - 1; actual += 2) {
200 debug("WP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
201 spi_w8r8(flash->spi, CMD_SST_RDSR), buf + actual, cmd[0],
204 ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len,
207 debug("SF: sst word program failed\n");
211 ret = sst_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
220 ret = sst_disable_writing(flash);
222 /* If there is a single trailing byte, write it out */
223 if (!ret && actual != len)
224 ret = sst_byte_write(flash, offset, buf + actual);
227 debug("SF: sst: program %s %zu bytes @ 0x%zx\n",
228 ret ? "failure" : "success", len, offset - actual);
230 spi_release_bus(flash->spi);
235 sst_erase(struct spi_flash *flash, u32 offset, size_t len)
237 unsigned long sector_size;
243 * This function currently uses sector erase only.
244 * Probably speed things up by using bulk erase
248 sector_size = SST_SECTOR_SIZE;
250 if (offset % sector_size) {
251 debug("SF: Erase offset not multiple of sector size\n");
255 ret = spi_claim_bus(flash->spi);
257 debug("SF: Unable to claim SPI bus\n");
267 while (offset < end) {
268 cmd[1] = offset >> 16;
269 cmd[2] = offset >> 8;
270 offset += sector_size;
272 debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
273 cmd[2], cmd[3], offset);
275 ret = sst_enable_writing(flash);
279 ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), NULL, 0);
281 debug("SF: sst page erase failed\n");
285 ret = sst_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
290 debug("SF: sst: Successfully erased %lu bytes @ 0x%x\n",
291 len * sector_size, start);
293 spi_release_bus(flash->spi);
298 sst_unlock(struct spi_flash *flash)
303 ret = sst_enable_writing(flash);
309 ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &status, 1);
311 debug("SF: Unable to set status byte\n");
313 debug("SF: sst: status = %x\n", spi_w8r8(flash->spi, CMD_SST_RDSR));
319 spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode)
321 const struct sst_spi_flash_params *params;
322 struct sst_spi_flash *stm;
325 for (i = 0; i < ARRAY_SIZE(sst_spi_flash_table); ++i) {
326 params = &sst_spi_flash_table[i];
327 if (params->idcode1 == idcode[2])
331 if (i == ARRAY_SIZE(sst_spi_flash_table)) {
332 debug("SF: Unsupported SST ID %02x\n", idcode[1]);
336 stm = malloc(sizeof(*stm));
338 debug("SF: Failed to allocate memory\n");
342 stm->params = params;
343 stm->flash.spi = spi;
344 stm->flash.name = params->name;
346 stm->flash.write = sst_write;
347 stm->flash.erase = sst_erase;
348 stm->flash.read = sst_read_fast;
349 stm->flash.size = SST_SECTOR_SIZE * params->nr_sectors;
351 debug("SF: Detected %s with page size %u, total %u bytes\n",
352 params->name, SST_SECTOR_SIZE, stm->flash.size);
354 /* Flash powers up read-only, so clear BP# bits */
355 sst_unlock(&stm->flash);