/* * 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 <stdlib.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_EWSR 0x50 /* Enable 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; }; #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 = 0x4b, .nr_sectors = 2048, .name = "SST25VF064C", },{ .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) printk(BIOS_WARNING, "SF: Enabling Write failed\n"); return ret; } static int sst_enable_writing_status(struct spi_flash *flash) { int ret = spi_flash_cmd(flash->spi, CMD_SST_EWSR, NULL, 0); if (ret) printk(BIOS_WARNING, "SF: Enabling Write Status 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) printk(BIOS_WARNING, "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, }; #if CONFIG_DEBUG_SPI_FLASH printk(BIOS_SPEW, "BP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n", spi_w8r8(flash->spi, CMD_SST_RDSR), buf, cmd[0], offset); #endif 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 = 0; u8 cmd[4]; flash->spi->rw = SPI_WRITE_FLAG; /* 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) { #if CONFIG_DEBUG_SPI_FLASH printk(BIOS_SPEW, "WP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n", spi_w8r8(flash->spi, CMD_SST_RDSR), buf + actual, cmd[0], offset); #endif ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len, buf + actual, 2); if (ret) { printk(BIOS_WARNING, "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: #if CONFIG_DEBUG_SPI_FLASH printk(BIOS_SPEW, "SF: SST: program %s %zu bytes @ 0x%lx\n", ret ? "failure" : "success", len, (unsigned long)offset - actual); #endif return ret; } static int sst_unlock(struct spi_flash *flash) { int ret; u8 cmd, status; ret = sst_enable_writing_status(flash); if (ret) return ret; cmd = CMD_SST_WRSR; status = 0; ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &status, 1); if (ret) printk(BIOS_WARNING, "SF: Unable to set status byte\n"); printk(BIOS_INFO, "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)) { printk(BIOS_WARNING, "SF: Unsupported SST ID %02x\n", idcode[1]); return NULL; } stm = malloc(sizeof(*stm)); if (!stm) { printk(BIOS_WARNING, "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 = spi_flash_cmd_erase; stm->flash.status = spi_flash_cmd_status; stm->flash.read = spi_flash_cmd_read_fast; stm->flash.sector_size = SST_SECTOR_SIZE; stm->flash.size = stm->flash.sector_size * params->nr_sectors; stm->flash.erase_cmd = CMD_SST_SE; stm->flash.status_cmd = CMD_SST_RDSR; /* Flash powers up read-only, so clear BP# bits */ sst_unlock(&stm->flash); return &stm->flash; }