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[] = {
60 .name = "SST25VF040B",
64 .name = "SST25VF080B",
68 .name = "SST25VF016B",
72 .name = "SST25VF032B",
76 .name = "SST25VF064C",
97 sst_enable_writing(struct spi_flash *flash)
99 int ret = spi_flash_cmd(flash->spi, CMD_SST_WREN, NULL, 0);
101 debug("SF: Enabling Write failed\n");
106 sst_disable_writing(struct spi_flash *flash)
108 int ret = spi_flash_cmd(flash->spi, CMD_SST_WRDI, NULL, 0);
110 debug("SF: Disabling Write failed\n");
115 sst_byte_write(struct spi_flash *flash, u32 offset, const void *buf)
125 debug("BP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
126 spi_w8r8(flash->spi, CMD_SST_RDSR), buf, cmd[0], offset);
128 ret = sst_enable_writing(flash);
132 ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), buf, 1);
136 return spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
140 sst_write(struct spi_flash *flash, u32 offset, size_t len, const void *buf)
142 size_t actual, cmd_len;
146 ret = spi_claim_bus(flash->spi);
148 debug("SF: Unable to claim SPI bus\n");
152 /* If the data is not word aligned, write out leading single byte */
155 ret = sst_byte_write(flash, offset, buf);
161 ret = sst_enable_writing(flash);
166 cmd[0] = CMD_SST_AAI_WP;
167 cmd[1] = offset >> 16;
168 cmd[2] = offset >> 8;
171 for (; actual < len - 1; actual += 2) {
172 debug("WP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
173 spi_w8r8(flash->spi, CMD_SST_RDSR), buf + actual, cmd[0],
176 ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len,
179 debug("SF: sst word program failed\n");
183 ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
192 ret = sst_disable_writing(flash);
194 /* If there is a single trailing byte, write it out */
195 if (!ret && actual != len)
196 ret = sst_byte_write(flash, offset, buf + actual);
199 debug("SF: sst: program %s %zu bytes @ 0x%zx\n",
200 ret ? "failure" : "success", len, offset - actual);
202 spi_release_bus(flash->spi);
206 static int sst_erase(struct spi_flash *flash, u32 offset, size_t len)
208 return spi_flash_cmd_erase(flash, CMD_SST_SE, offset, len);
212 sst_unlock(struct spi_flash *flash)
217 ret = sst_enable_writing(flash);
223 ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &status, 1);
225 debug("SF: Unable to set status byte\n");
227 debug("SF: sst: status = %x\n", spi_w8r8(flash->spi, CMD_SST_RDSR));
233 spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode)
235 const struct sst_spi_flash_params *params;
236 struct sst_spi_flash *stm;
239 for (i = 0; i < ARRAY_SIZE(sst_spi_flash_table); ++i) {
240 params = &sst_spi_flash_table[i];
241 if (params->idcode1 == idcode[2])
245 if (i == ARRAY_SIZE(sst_spi_flash_table)) {
246 debug("SF: Unsupported SST ID %02x\n", idcode[1]);
250 stm = malloc(sizeof(*stm));
252 debug("SF: Failed to allocate memory\n");
256 stm->params = params;
257 stm->flash.spi = spi;
258 stm->flash.name = params->name;
260 stm->flash.write = sst_write;
261 stm->flash.erase = sst_erase;
262 stm->flash.read = spi_flash_cmd_read_fast;
263 stm->flash.sector_size = SST_SECTOR_SIZE;
264 stm->flash.size = stm->flash.sector_size * params->nr_sectors;
266 /* Flash powers up read-only, so clear BP# bits */
267 sst_unlock(&stm->flash);