u-boot/drivers/mtd/spi/sst.c
Mike Frysinger 8875bdb341 sf: sst: support newer standardized flashes
Newer SST flashes have dropped the Auto Address Increment (AAI) word
programming (WP) modes in favor of the standard page programming mode
that most flashes now support.  So add a flags field to the different
flashes to support both modes with new and old styles.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-07-26 16:32:59 +02:00

288 lines
6.5 KiB
C

/*
* 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 */
#define SST_FEAT_WP (1 << 0) /* Supports AAI word program */
#define SST_FEAT_MBP (1 << 1) /* Supports multibyte program */
struct sst_spi_flash_params {
u8 idcode1;
u8 flags;
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)
#define SST_PAGE_SIZE 256
static const struct sst_spi_flash_params sst_spi_flash_table[] = {
{
.idcode1 = 0x8d,
.flags = SST_FEAT_WP,
.nr_sectors = 128,
.name = "SST25VF040B",
},{
.idcode1 = 0x8e,
.flags = SST_FEAT_WP,
.nr_sectors = 256,
.name = "SST25VF080B",
},{
.idcode1 = 0x41,
.flags = SST_FEAT_WP,
.nr_sectors = 512,
.name = "SST25VF016B",
},{
.idcode1 = 0x4a,
.flags = SST_FEAT_WP,
.nr_sectors = 1024,
.name = "SST25VF032B",
},{
.idcode1 = 0x4b,
.flags = SST_FEAT_MBP,
.nr_sectors = 2048,
.name = "SST25VF064C",
},{
.idcode1 = 0x01,
.flags = SST_FEAT_WP,
.nr_sectors = 16,
.name = "SST25WF512",
},{
.idcode1 = 0x02,
.flags = SST_FEAT_WP,
.nr_sectors = 32,
.name = "SST25WF010",
},{
.idcode1 = 0x03,
.flags = SST_FEAT_WP,
.nr_sectors = 64,
.name = "SST25WF020",
},{
.idcode1 = 0x04,
.flags = SST_FEAT_WP,
.nr_sectors = 128,
.name = "SST25WF040",
},
};
static int
sst_enable_writing(struct spi_flash *flash)
{
int ret = spi_flash_cmd_write_enable(flash);
if (ret)
debug("SF: Enabling Write failed\n");
return ret;
}
static int
sst_disable_writing(struct spi_flash *flash)
{
int ret = spi_flash_cmd_write_disable(flash);
if (ret)
debug("SF: Disabling Write failed\n");
return ret;
}
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_wp(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;
}
static int sst_erase(struct spi_flash *flash, u32 offset, size_t len)
{
return spi_flash_cmd_erase(flash, CMD_SST_SE, 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;
if (stm->params->flags & SST_FEAT_WP)
stm->flash.write = sst_write_wp;
else
stm->flash.write = spi_flash_cmd_write_multi;
stm->flash.erase = sst_erase;
stm->flash.read = spi_flash_cmd_read_fast;
stm->flash.page_size = SST_PAGE_SIZE;
stm->flash.sector_size = SST_SECTOR_SIZE;
stm->flash.size = stm->flash.sector_size * params->nr_sectors;
/* Flash powers up read-only, so clear BP# bits */
sst_unlock(&stm->flash);
return &stm->flash;
}