sf: add driver for SST flashes
Signed-off-by: Mike Frysinger <vapier@gentoo.org> Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
This commit is contained in:
Mike Frysinger
parent
f773a1bbdb
commit
1c5874374e
@ -28,6 +28,7 @@ LIB := $(obj)libspi_flash.a
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COBJS-$(CONFIG_SPI_FLASH) += spi_flash.o
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COBJS-$(CONFIG_SPI_FLASH_ATMEL) += atmel.o
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COBJS-$(CONFIG_SPI_FLASH_SPANSION) += spansion.o
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COBJS-$(CONFIG_SPI_FLASH_SST) += sst.o
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COBJS-$(CONFIG_SPI_FLASH_STMICRO) += stmicro.o
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COBJS := $(COBJS-y)
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@ -138,6 +138,11 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
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case 0x20:
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flash = spi_flash_probe_stmicro(spi, idcode);
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break;
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#endif
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#ifdef CONFIG_SPI_FLASH_SST
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case 0xBF:
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flash = spi_flash_probe_sst(spi, idcode);
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break;
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#endif
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default:
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debug("SF: Unsupported manufacturer %02X\n", idcode[0]);
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@ -43,4 +43,5 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
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/* Manufacturer-specific probe functions */
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struct spi_flash *spi_flash_probe_spansion(struct spi_slave *spi, u8 *idcode);
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struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode);
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struct spi_flash *spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode);
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struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 *idcode);
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358
drivers/mtd/spi/sst.c
Normal file
358
drivers/mtd/spi/sst.c
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@ -0,0 +1,358 @@
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/*
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* Driver for SST serial flashes
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*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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* Copyright 2008, Network Appliance Inc.
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* Jason McMullan <mcmullan@netapp.com>
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* Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
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* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
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* Copyright (c) 2008-2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <malloc.h>
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#include <spi_flash.h>
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#include "spi_flash_internal.h"
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#define CMD_SST_WREN 0x06 /* Write Enable */
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#define CMD_SST_WRDI 0x04 /* Write Disable */
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#define CMD_SST_RDSR 0x05 /* Read Status Register */
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#define CMD_SST_WRSR 0x01 /* Write Status Register */
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#define CMD_SST_READ 0x03 /* Read Data Bytes */
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#define CMD_SST_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */
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#define CMD_SST_BP 0x02 /* Byte Program */
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#define CMD_SST_AAI_WP 0xAD /* Auto Address Increment Word Program */
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#define CMD_SST_SE 0x20 /* Sector Erase */
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#define SST_SR_WIP (1 << 0) /* Write-in-Progress */
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#define SST_SR_WEL (1 << 1) /* Write enable */
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#define SST_SR_BP0 (1 << 2) /* Block Protection 0 */
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#define SST_SR_BP1 (1 << 3) /* Block Protection 1 */
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#define SST_SR_BP2 (1 << 4) /* Block Protection 2 */
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#define SST_SR_AAI (1 << 6) /* Addressing mode */
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#define SST_SR_BPL (1 << 7) /* BP bits lock */
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struct sst_spi_flash_params {
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u8 idcode1;
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u16 nr_sectors;
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const char *name;
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};
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struct sst_spi_flash {
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struct spi_flash flash;
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const struct sst_spi_flash_params *params;
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};
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static inline struct sst_spi_flash *to_sst_spi_flash(struct spi_flash *flash)
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{
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return container_of(flash, struct sst_spi_flash, flash);
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}
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#define SST_SECTOR_SIZE (4 * 1024)
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static const struct sst_spi_flash_params sst_spi_flash_table[] = {
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{
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.idcode1 = 0x01,
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.nr_sectors = 128,
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.name = "SST25WF512",
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},{
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.idcode1 = 0x02,
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.nr_sectors = 256,
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.name = "SST25WF010",
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},{
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.idcode1 = 0x03,
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.nr_sectors = 512,
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.name = "SST25WF020",
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},{
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.idcode1 = 0x04,
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.nr_sectors = 1024,
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.name = "SST25WF040",
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},
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};
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static int
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sst_wait_ready(struct spi_flash *flash, unsigned long timeout)
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{
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struct spi_slave *spi = flash->spi;
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unsigned long timebase;
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int ret;
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u8 byte = CMD_SST_RDSR;
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ret = spi_xfer(spi, sizeof(byte) * 8, &byte, NULL, SPI_XFER_BEGIN);
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if (ret) {
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debug("SF: Failed to send command %02x: %d\n", byte, ret);
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return ret;
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}
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timebase = get_timer(0);
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do {
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ret = spi_xfer(spi, sizeof(byte) * 8, NULL, &byte, 0);
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if (ret)
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break;
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if ((byte & SST_SR_WIP) == 0)
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break;
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} while (get_timer(timebase) < timeout);
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spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
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if (!ret && (byte & SST_SR_WIP) != 0)
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ret = -1;
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if (ret)
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debug("SF: sst wait for ready timed out\n");
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return ret;
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}
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static int
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sst_enable_writing(struct spi_flash *flash)
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{
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int ret = spi_flash_cmd(flash->spi, CMD_SST_WREN, NULL, 0);
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if (ret)
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debug("SF: Enabling Write failed\n");
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return ret;
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}
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static int
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sst_disable_writing(struct spi_flash *flash)
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{
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int ret = spi_flash_cmd(flash->spi, CMD_SST_WRDI, NULL, 0);
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if (ret)
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debug("SF: Disabling Write failed\n");
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return ret;
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}
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static int
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sst_read_fast(struct spi_flash *flash, u32 offset, size_t len, void *buf)
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{
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u8 cmd[5] = {
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CMD_READ_ARRAY_FAST,
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offset >> 16,
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offset >> 8,
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offset,
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0x00,
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};
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return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
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}
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static int
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sst_byte_write(struct spi_flash *flash, u32 offset, const void *buf)
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{
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int ret;
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u8 cmd[4] = {
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CMD_SST_BP,
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offset >> 16,
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offset >> 8,
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offset,
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};
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debug("BP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
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spi_w8r8(flash->spi, CMD_SST_RDSR), buf, cmd[0], offset);
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ret = sst_enable_writing(flash);
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if (ret)
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return ret;
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ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), buf, 1);
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if (ret)
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return ret;
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return sst_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
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}
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static int
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sst_write(struct spi_flash *flash, u32 offset, size_t len, const void *buf)
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{
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size_t actual, cmd_len;
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int ret;
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u8 cmd[4];
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ret = spi_claim_bus(flash->spi);
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if (ret) {
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debug("SF: Unable to claim SPI bus\n");
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return ret;
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}
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/* If the data is not word aligned, write out leading single byte */
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actual = offset % 2;
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if (actual) {
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ret = sst_byte_write(flash, offset, buf);
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if (ret)
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goto done;
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}
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offset += actual;
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ret = sst_enable_writing(flash);
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if (ret)
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goto done;
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cmd_len = 4;
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cmd[0] = CMD_SST_AAI_WP;
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cmd[1] = offset >> 16;
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cmd[2] = offset >> 8;
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cmd[3] = offset;
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for (; actual < len - 1; actual += 2) {
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debug("WP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
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spi_w8r8(flash->spi, CMD_SST_RDSR), buf + actual, cmd[0],
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offset);
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ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len,
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buf + actual, 2);
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if (ret) {
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debug("SF: sst word program failed\n");
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break;
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}
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ret = sst_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
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if (ret)
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break;
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cmd_len = 1;
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offset += 2;
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}
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if (!ret)
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ret = sst_disable_writing(flash);
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/* If there is a single trailing byte, write it out */
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if (!ret && actual != len)
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ret = sst_byte_write(flash, offset, buf + actual);
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done:
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debug("SF: sst: program %s %zu bytes @ 0x%zx\n",
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ret ? "failure" : "success", len, offset - actual);
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spi_release_bus(flash->spi);
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return ret;
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}
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int
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sst_erase(struct spi_flash *flash, u32 offset, size_t len)
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{
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unsigned long sector_size;
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u32 start, end;
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int ret;
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u8 cmd[4];
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/*
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* This function currently uses sector erase only.
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* Probably speed things up by using bulk erase
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* when possible.
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*/
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sector_size = SST_SECTOR_SIZE;
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if (offset % sector_size) {
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debug("SF: Erase offset not multiple of sector size\n");
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return -1;
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}
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ret = spi_claim_bus(flash->spi);
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if (ret) {
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debug("SF: Unable to claim SPI bus\n");
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return ret;
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}
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cmd[0] = CMD_SST_SE;
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cmd[3] = 0;
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start = offset;
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end = start + len;
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ret = 0;
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while (offset < end) {
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cmd[1] = offset >> 16;
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cmd[2] = offset >> 8;
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offset += sector_size;
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debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
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cmd[2], cmd[3], offset);
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ret = sst_enable_writing(flash);
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if (ret)
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break;
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ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), NULL, 0);
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if (ret) {
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debug("SF: sst page erase failed\n");
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break;
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}
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ret = sst_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
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if (ret)
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break;
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}
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debug("SF: sst: Successfully erased %lu bytes @ 0x%x\n",
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len * sector_size, start);
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spi_release_bus(flash->spi);
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return ret;
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}
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static int
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sst_unlock(struct spi_flash *flash)
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{
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int ret;
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u8 cmd, status;
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ret = sst_enable_writing(flash);
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if (ret)
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return ret;
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cmd = CMD_SST_WRSR;
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status = 0;
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ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &status, 1);
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if (ret)
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debug("SF: Unable to set status byte\n");
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debug("SF: sst: status = %x\n", spi_w8r8(flash->spi, CMD_SST_RDSR));
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return ret;
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}
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struct spi_flash *
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spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode)
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{
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const struct sst_spi_flash_params *params;
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struct sst_spi_flash *stm;
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size_t i;
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for (i = 0; i < ARRAY_SIZE(sst_spi_flash_table); ++i) {
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params = &sst_spi_flash_table[i];
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if (params->idcode1 == idcode[2])
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break;
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}
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if (i == ARRAY_SIZE(sst_spi_flash_table)) {
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debug("SF: Unsupported SST ID %02x\n", idcode[1]);
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return NULL;
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}
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stm = malloc(sizeof(*stm));
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if (!stm) {
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debug("SF: Failed to allocate memory\n");
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return NULL;
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}
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stm->params = params;
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stm->flash.spi = spi;
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stm->flash.name = params->name;
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stm->flash.write = sst_write;
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stm->flash.erase = sst_erase;
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stm->flash.read = sst_read_fast;
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stm->flash.size = SST_SECTOR_SIZE * params->nr_sectors;
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debug("SF: Detected %s with page size %u, total %u bytes\n",
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params->name, SST_SECTOR_SIZE, stm->flash.size);
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/* Flash powers up read-only, so clear BP# bits */
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sst_unlock(&stm->flash);
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return &stm->flash;
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}
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