Signed-off-by: Mike Frysinger <vapier@gentoo.org> Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>master
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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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