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https://github.com/AsahiLinux/u-boot
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sf: new driver for Winbond W25X16/32/64 devices
Signed-off-by: Jason McMullan <jason.mcmullan@gmail.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Jason McMullan
Wolfgang Denk
parent
cada315100
commit
d394a77950
4 changed files with 339 additions and 0 deletions
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@ -31,6 +31,7 @@ COBJS-$(CONFIG_SPI_FLASH_MACRONIX) += macronix.o
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COBJS-$(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-$(CONFIG_SPI_FLASH_WINBOND) += winbond.o
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COBJS-$(CONFIG_SPI_M95XXX) += eeprom_m95xxx.o
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COBJS := $(COBJS-y)
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@ -140,6 +140,11 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
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flash = spi_flash_probe_macronix(spi, idcode);
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break;
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#endif
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#ifdef CONFIG_SPI_FLASH_WINBOND
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case 0xef:
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flash = spi_flash_probe_winbond(spi, idcode);
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break;
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#endif
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#ifdef CONFIG_SPI_FLASH_STMICRO
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case 0x20:
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flash = spi_flash_probe_stmicro(spi, idcode);
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@ -49,3 +49,4 @@ struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode);
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struct spi_flash *spi_flash_probe_macronix(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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struct spi_flash *spi_flash_probe_winbond(struct spi_slave *spi, u8 *idcode);
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332
drivers/mtd/spi/winbond.c
Normal file
332
drivers/mtd/spi/winbond.c
Normal file
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@ -0,0 +1,332 @@
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/*
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* Copyright 2008, Network Appliance Inc.
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* Author: Jason McMullan <mcmullan <at> netapp.com>
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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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/* M25Pxx-specific commands */
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#define CMD_W25_WREN 0x06 /* Write Enable */
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#define CMD_W25_WRDI 0x04 /* Write Disable */
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#define CMD_W25_RDSR 0x05 /* Read Status Register */
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#define CMD_W25_WRSR 0x01 /* Write Status Register */
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#define CMD_W25_READ 0x03 /* Read Data Bytes */
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#define CMD_W25_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */
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#define CMD_W25_PP 0x02 /* Page Program */
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#define CMD_W25_SE 0x20 /* Sector (4K) Erase */
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#define CMD_W25_BE 0xd8 /* Block (64K) Erase */
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#define CMD_W25_CE 0xc7 /* Chip Erase */
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#define CMD_W25_DP 0xb9 /* Deep Power-down */
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#define CMD_W25_RES 0xab /* Release from DP, and Read Signature */
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#define WINBOND_ID_W25X16 0x3015
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#define WINBOND_ID_W25X32 0x3016
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#define WINBOND_ID_W25X64 0x3017
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#define WINBOND_SR_WIP (1 << 0) /* Write-in-Progress */
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struct winbond_spi_flash_params {
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uint16_t id;
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/* Log2 of page size in power-of-two mode */
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uint8_t l2_page_size;
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uint16_t pages_per_sector;
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uint16_t sectors_per_block;
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uint8_t nr_blocks;
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const char *name;
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};
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/* spi_flash needs to be first so upper layers can free() it */
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struct winbond_spi_flash {
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struct spi_flash flash;
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const struct winbond_spi_flash_params *params;
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};
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static inline struct winbond_spi_flash *
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to_winbond_spi_flash(struct spi_flash *flash)
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{
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return container_of(flash, struct winbond_spi_flash, flash);
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}
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static const struct winbond_spi_flash_params winbond_spi_flash_table[] = {
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{
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.id = WINBOND_ID_W25X16,
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.l2_page_size = 8,
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.pages_per_sector = 16,
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.sectors_per_block = 16,
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.nr_blocks = 32,
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.name = "W25X16",
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},
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{
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.id = WINBOND_ID_W25X32,
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.l2_page_size = 8,
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.pages_per_sector = 16,
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.sectors_per_block = 16,
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.nr_blocks = 64,
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.name = "W25X32",
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},
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{
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.id = WINBOND_ID_W25X64,
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.l2_page_size = 8,
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.pages_per_sector = 16,
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.sectors_per_block = 16,
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.nr_blocks = 128,
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.name = "W25X64",
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},
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};
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static int winbond_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 status;
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u8 cmd[4] = { CMD_W25_RDSR, 0xff, 0xff, 0xff };
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ret = spi_xfer(spi, 32, &cmd[0], NULL, SPI_XFER_BEGIN);
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if (ret) {
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debug("SF: Failed to send command %02x: %d\n", cmd, 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, 8, NULL, &status, 0);
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if (ret) {
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debug("SF: Failed to get status for cmd %02x: %d\n", cmd, ret);
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return -1;
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}
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if ((status & WINBOND_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 ((status & WINBOND_SR_WIP) == 0)
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return 0;
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debug("SF: Timed out on command %02x: %d\n", cmd, ret);
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/* Timed out */
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return -1;
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}
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/*
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* Assemble the address part of a command for Winbond devices in
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* non-power-of-two page size mode.
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*/
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static void winbond_build_address(struct winbond_spi_flash *stm, u8 *cmd, u32 offset)
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{
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unsigned long page_addr;
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unsigned long byte_addr;
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unsigned long page_size;
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unsigned int page_shift;
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/*
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* The "extra" space per page is the power-of-two page size
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* divided by 32.
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*/
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page_shift = stm->params->l2_page_size;
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page_size = (1 << page_shift);
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page_addr = offset / page_size;
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byte_addr = offset % page_size;
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cmd[0] = page_addr >> (16 - page_shift);
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cmd[1] = page_addr << (page_shift - 8) | (byte_addr >> 8);
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cmd[2] = byte_addr;
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}
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static int winbond_read_fast(struct spi_flash *flash,
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u32 offset, size_t len, void *buf)
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{
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struct winbond_spi_flash *stm = to_winbond_spi_flash(flash);
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u8 cmd[5];
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cmd[0] = CMD_READ_ARRAY_FAST;
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winbond_build_address(stm, cmd + 1, offset);
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cmd[4] = 0x00;
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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 winbond_write(struct spi_flash *flash,
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u32 offset, size_t len, const void *buf)
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{
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struct winbond_spi_flash *stm = to_winbond_spi_flash(flash);
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unsigned long page_addr;
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unsigned long byte_addr;
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unsigned long page_size;
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unsigned int page_shift;
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size_t chunk_len;
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size_t actual;
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int ret;
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u8 cmd[4];
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page_shift = stm->params->l2_page_size;
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page_size = (1 << page_shift);
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page_addr = offset / page_size;
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byte_addr = offset % page_size;
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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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for (actual = 0; actual < len; actual += chunk_len) {
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chunk_len = min(len - actual, page_size - byte_addr);
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cmd[0] = CMD_W25_PP;
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cmd[1] = page_addr >> (16 - page_shift);
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cmd[2] = page_addr << (page_shift - 8) | (byte_addr >> 8);
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cmd[3] = byte_addr;
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debug("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %d\n",
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buf + actual,
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cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
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ret = spi_flash_cmd(flash->spi, CMD_W25_WREN, NULL, 0);
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if (ret < 0) {
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debug("SF: Enabling Write failed\n");
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goto out;
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}
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ret = spi_flash_cmd_write(flash->spi, cmd, 4,
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buf + actual, chunk_len);
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if (ret < 0) {
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debug("SF: Winbond Page Program failed\n");
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goto out;
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}
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ret = winbond_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
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if (ret < 0) {
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debug("SF: Winbond page programming timed out\n");
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goto out;
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}
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page_addr++;
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byte_addr = 0;
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}
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debug("SF: Winbond: Successfully programmed %u bytes @ 0x%x\n",
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len, offset);
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ret = 0;
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out:
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spi_release_bus(flash->spi);
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return ret;
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}
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int winbond_erase(struct spi_flash *flash, u32 offset, size_t len)
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{
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struct winbond_spi_flash *stm = to_winbond_spi_flash(flash);
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unsigned long sector_size;
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unsigned int page_shift;
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size_t actual;
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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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page_shift = stm->params->l2_page_size;
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sector_size = (1 << page_shift) * stm->params->pages_per_sector;
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if (offset % sector_size || len % sector_size) {
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debug("SF: Erase offset/length not multiple of sector size\n");
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return -1;
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}
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len /= sector_size;
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cmd[0] = CMD_W25_SE;
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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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for (actual = 0; actual < len; actual++) {
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winbond_build_address(stm, &cmd[1], offset + actual * sector_size);
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printf("Erase: %02x %02x %02x %02x\n",
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cmd[0], cmd[1], cmd[2], cmd[3]);
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ret = spi_flash_cmd(flash->spi, CMD_W25_WREN, NULL, 0);
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if (ret < 0) {
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debug("SF: Enabling Write failed\n");
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goto out;
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}
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ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
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if (ret < 0) {
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debug("SF: Winbond sector erase failed\n");
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goto out;
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}
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ret = winbond_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
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if (ret < 0) {
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debug("SF: Winbond sector erase timed out\n");
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goto out;
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}
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}
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debug("SF: Winbond: Successfully erased %u bytes @ 0x%x\n",
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len * sector_size, offset);
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ret = 0;
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out:
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spi_release_bus(flash->spi);
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return ret;
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}
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struct spi_flash *spi_flash_probe_winbond(struct spi_slave *spi, u8 *idcode)
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{
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const struct winbond_spi_flash_params *params;
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unsigned long page_size;
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struct winbond_spi_flash *stm;
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(winbond_spi_flash_table); i++) {
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params = &winbond_spi_flash_table[i];
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if (params->id == ((idcode[1] << 8) | idcode[2]))
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break;
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}
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if (i == ARRAY_SIZE(winbond_spi_flash_table)) {
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debug("SF: Unsupported Winbond ID %02x%02x\n",
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idcode[1], idcode[2]);
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return NULL;
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}
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stm = malloc(sizeof(struct winbond_spi_flash));
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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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/* Assuming power-of-two page size initially. */
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page_size = 1 << params->l2_page_size;
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stm->flash.write = winbond_write;
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stm->flash.erase = winbond_erase;
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stm->flash.read = winbond_read_fast;
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stm->flash.size = page_size * params->pages_per_sector
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* params->sectors_per_block
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* params->nr_blocks;
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debug("SF: Detected %s with page size %u, total %u bytes\n",
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params->name, page_size, stm->flash.size);
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return &stm->flash;
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}
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