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/*
* Driver for SST serial flashes
*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
* Copyright 2008, Network Appliance Inc.
* Jason McMullan <mcmullan@netapp.com>
* Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
* Copyright (c) 2008-2009 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <malloc.h>
#include <spi_flash.h>
#include "spi_flash_internal.h"
#define CMD_SST_WREN 0x06 /* Write Enable */
#define CMD_SST_WRDI 0x04 /* Write Disable */
#define CMD_SST_RDSR 0x05 /* Read Status Register */
#define CMD_SST_WRSR 0x01 /* Write Status Register */
#define CMD_SST_READ 0x03 /* Read Data Bytes */
#define CMD_SST_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */
#define CMD_SST_BP 0x02 /* Byte Program */
#define CMD_SST_AAI_WP 0xAD /* Auto Address Increment Word Program */
#define CMD_SST_SE 0x20 /* Sector Erase */
#define SST_SR_WIP (1 << 0) /* Write-in-Progress */
#define SST_SR_WEL (1 << 1) /* Write enable */
#define SST_SR_BP0 (1 << 2) /* Block Protection 0 */
#define SST_SR_BP1 (1 << 3) /* Block Protection 1 */
#define SST_SR_BP2 (1 << 4) /* Block Protection 2 */
#define SST_SR_AAI (1 << 6) /* Addressing mode */
#define SST_SR_BPL (1 << 7) /* BP bits lock */
struct sst_spi_flash_params {
u8 idcode1;
u16 nr_sectors;
const char *name;
};
struct sst_spi_flash {
struct spi_flash flash;
const struct sst_spi_flash_params *params;
};
static inline struct sst_spi_flash *to_sst_spi_flash(struct spi_flash *flash)
{
return container_of(flash, struct sst_spi_flash, flash);
}
#define SST_SECTOR_SIZE (4 * 1024)
static const struct sst_spi_flash_params sst_spi_flash_table[] = {
{
.idcode1 = 0x8d,
.nr_sectors = 128,
.name = "SST25VF040B",
},{
.idcode1 = 0x8e,
.nr_sectors = 256,
.name = "SST25VF080B",
},{
.idcode1 = 0x41,
.nr_sectors = 512,
.name = "SST25VF016B",
},{
.idcode1 = 0x4a,
.nr_sectors = 1024,
.name = "SST25VF032B",
},{
.idcode1 = 0x01,
.nr_sectors = 16,
.name = "SST25WF512",
},{
.idcode1 = 0x02,
.nr_sectors = 32,
.name = "SST25WF010",
},{
.idcode1 = 0x03,
.nr_sectors = 64,
.name = "SST25WF020",
},{
.idcode1 = 0x04,
.nr_sectors = 128,
.name = "SST25WF040",
},
};
static int
sst_enable_writing(struct spi_flash *flash)
{
int ret = spi_flash_cmd(flash->spi, CMD_SST_WREN, NULL, 0);
if (ret)
debug("SF: Enabling Write failed\n");
return ret;
}
static int
sst_disable_writing(struct spi_flash *flash)
{
int ret = spi_flash_cmd(flash->spi, CMD_SST_WRDI, NULL, 0);
if (ret)
debug("SF: Disabling Write failed\n");
return ret;
}
static int
sst_read_fast(struct spi_flash *flash, u32 offset, size_t len, void *buf)
{
u8 cmd[5] = {
CMD_READ_ARRAY_FAST,
offset >> 16,
offset >> 8,
offset,
0x00,
};
return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
}
static int
sst_byte_write(struct spi_flash *flash, u32 offset, const void *buf)
{
int ret;
u8 cmd[4] = {
CMD_SST_BP,
offset >> 16,
offset >> 8,
offset,
};
debug("BP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
spi_w8r8(flash->spi, CMD_SST_RDSR), buf, cmd[0], offset);
ret = sst_enable_writing(flash);
if (ret)
return ret;
ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), buf, 1);
if (ret)
return ret;
return spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
}
static int
sst_write(struct spi_flash *flash, u32 offset, size_t len, const void *buf)
{
size_t actual, cmd_len;
int ret;
u8 cmd[4];
ret = spi_claim_bus(flash->spi);
if (ret) {
debug("SF: Unable to claim SPI bus\n");
return ret;
}
/* If the data is not word aligned, write out leading single byte */
actual = offset % 2;
if (actual) {
ret = sst_byte_write(flash, offset, buf);
if (ret)
goto done;
}
offset += actual;
ret = sst_enable_writing(flash);
if (ret)
goto done;
cmd_len = 4;
cmd[0] = CMD_SST_AAI_WP;
cmd[1] = offset >> 16;
cmd[2] = offset >> 8;
cmd[3] = offset;
for (; actual < len - 1; actual += 2) {
debug("WP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
spi_w8r8(flash->spi, CMD_SST_RDSR), buf + actual, cmd[0],
offset);
ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len,
buf + actual, 2);
if (ret) {
debug("SF: sst word program failed\n");
break;
}
ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
if (ret)
break;
cmd_len = 1;
offset += 2;
}
if (!ret)
ret = sst_disable_writing(flash);
/* If there is a single trailing byte, write it out */
if (!ret && actual != len)
ret = sst_byte_write(flash, offset, buf + actual);
done:
debug("SF: sst: program %s %zu bytes @ 0x%zx\n",
ret ? "failure" : "success", len, offset - actual);
spi_release_bus(flash->spi);
return ret;
}
int sst_erase(struct spi_flash *flash, u32 offset, size_t len)
{
return spi_flash_cmd_erase(flash, CMD_SST_SE, SST_SECTOR_SIZE,
offset, len);
}
static int
sst_unlock(struct spi_flash *flash)
{
int ret;
u8 cmd, status;
ret = sst_enable_writing(flash);
if (ret)
return ret;
cmd = CMD_SST_WRSR;
status = 0;
ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &status, 1);
if (ret)
debug("SF: Unable to set status byte\n");
debug("SF: sst: status = %x\n", spi_w8r8(flash->spi, CMD_SST_RDSR));
return ret;
}
struct spi_flash *
spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode)
{
const struct sst_spi_flash_params *params;
struct sst_spi_flash *stm;
size_t i;
for (i = 0; i < ARRAY_SIZE(sst_spi_flash_table); ++i) {
params = &sst_spi_flash_table[i];
if (params->idcode1 == idcode[2])
break;
}
if (i == ARRAY_SIZE(sst_spi_flash_table)) {
debug("SF: Unsupported SST ID %02x\n", idcode[1]);
return NULL;
}
stm = malloc(sizeof(*stm));
if (!stm) {
debug("SF: Failed to allocate memory\n");
return NULL;
}
stm->params = params;
stm->flash.spi = spi;
stm->flash.name = params->name;
stm->flash.write = sst_write;
stm->flash.erase = sst_erase;
stm->flash.read = sst_read_fast;
stm->flash.size = SST_SECTOR_SIZE * params->nr_sectors;
printf("SF: Detected %s with page size %u, total ",
params->name, SST_SECTOR_SIZE);
print_size(stm->flash.size, "\n");
/* Flash powers up read-only, so clear BP# bits */
sst_unlock(&stm->flash);
return &stm->flash;
}
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