This adds a new SPI flash subsystem. Currently, only AT45 DataFlash in non-power-of-two mode is supported, but some preliminary support for other flash types is in place as well. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>master
parent
60445cb5c3
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d25ce7d24c
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#
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# (C) Copyright 2006
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# See file CREDITS for list of people who contributed to this
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# project.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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# MA 02111-1307 USA
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#
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include $(TOPDIR)/config.mk |
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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 := $(COBJS-y)
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SRCS := $(COBJS:.o=.c)
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OBJS := $(addprefix $(obj),$(COBJS))
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all: $(LIB) |
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$(LIB): $(obj).depend $(OBJS) |
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$(AR) $(ARFLAGS) $@ $(OBJS)
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#########################################################################
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# defines $(obj).depend target
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include $(SRCTREE)/rules.mk |
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sinclude $(obj).depend |
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#########################################################################
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@ -0,0 +1,362 @@ |
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/*
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* Atmel SPI DataFlash support |
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* |
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* Copyright (C) 2008 Atmel Corporation |
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*/ |
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#define DEBUG |
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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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/* AT45-specific commands */ |
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#define CMD_AT45_READ_STATUS 0xd7 |
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#define CMD_AT45_ERASE_PAGE 0x81 |
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#define CMD_AT45_LOAD_PROG_BUF1 0x82 |
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#define CMD_AT45_LOAD_BUF1 0x84 |
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#define CMD_AT45_LOAD_PROG_BUF2 0x85 |
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#define CMD_AT45_LOAD_BUF2 0x87 |
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#define CMD_AT45_PROG_BUF1 0x88 |
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#define CMD_AT45_PROG_BUF2 0x89 |
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/* AT45 status register bits */ |
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#define AT45_STATUS_P2_PAGE_SIZE (1 << 0) |
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#define AT45_STATUS_READY (1 << 7) |
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/* DataFlash family IDs, as obtained from the second idcode byte */ |
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#define DF_FAMILY_AT26F 0 |
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#define DF_FAMILY_AT45 1 |
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#define DF_FAMILY_AT26DF 2 /* AT25DF and AT26DF */ |
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struct atmel_spi_flash_params { |
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u8 idcode1; |
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/* Log2 of page size in power-of-two mode */ |
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u8 l2_page_size; |
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u8 pages_per_block; |
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u8 blocks_per_sector; |
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u8 nr_sectors; |
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const char *name; |
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}; |
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struct atmel_spi_flash { |
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const struct atmel_spi_flash_params *params; |
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struct spi_flash flash; |
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}; |
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static inline struct atmel_spi_flash * |
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to_atmel_spi_flash(struct spi_flash *flash) |
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{ |
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return container_of(flash, struct atmel_spi_flash, flash); |
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} |
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static const struct atmel_spi_flash_params atmel_spi_flash_table[] = { |
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{ |
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.idcode1 = 0x28, |
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.l2_page_size = 10, |
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.pages_per_block = 8, |
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.blocks_per_sector = 32, |
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.nr_sectors = 32, |
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.name = "AT45DB642D", |
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}, |
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}; |
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static int at45_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 cmd = CMD_AT45_READ_STATUS; |
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u8 status; |
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timebase = get_timer(0); |
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ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN); |
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if (ret) |
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return -1; |
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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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return -1; |
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if (status & AT45_STATUS_READY) |
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break; |
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} while (get_timer(timebase) < timeout); |
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/* Deactivate CS */ |
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spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END); |
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if (status & AT45_STATUS_READY) |
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return 0; |
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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 AT45 devices in |
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* non-power-of-two page size mode. |
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*/ |
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static void at45_build_address(struct atmel_spi_flash *asf, 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 = asf->params->l2_page_size; |
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page_size = (1 << page_shift) + (1 << (page_shift - 5)); |
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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 dataflash_read_fast_p2(struct spi_flash *flash, |
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u32 offset, size_t len, void *buf) |
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{ |
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u8 cmd[5]; |
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cmd[0] = CMD_READ_ARRAY_FAST; |
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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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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 dataflash_read_fast_at45(struct spi_flash *flash, |
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u32 offset, size_t len, void *buf) |
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{ |
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struct atmel_spi_flash *asf = to_atmel_spi_flash(flash); |
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u8 cmd[5]; |
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cmd[0] = CMD_READ_ARRAY_FAST; |
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at45_build_address(asf, 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 dataflash_write_at45(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 atmel_spi_flash *asf = to_atmel_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 = asf->params->l2_page_size; |
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page_size = (1 << page_shift) + (1 << (page_shift - 5)); |
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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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/* Use the same address bits for both commands */ |
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cmd[0] = CMD_AT45_LOAD_BUF1; |
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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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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: Loading AT45 buffer failed\n"); |
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goto out; |
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} |
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cmd[0] = CMD_AT45_PROG_BUF1; |
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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: AT45 page programming failed\n"); |
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goto out; |
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} |
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ret = at45_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT); |
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if (ret < 0) { |
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debug("SF: AT45 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: AT45: 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 dataflash_erase_at45(struct spi_flash *flash, u32 offset, size_t len) |
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{ |
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struct atmel_spi_flash *asf = to_atmel_spi_flash(flash); |
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unsigned long page_addr; |
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unsigned long page_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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* TODO: This function currently uses page erase only. We can |
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* probably speed things up by using block and/or sector erase |
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* when possible. |
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*/ |
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page_shift = asf->params->l2_page_size; |
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page_size = (1 << page_shift) + (1 << (page_shift - 5)); |
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page_shift++; |
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page_addr = offset / page_size; |
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if (offset % page_size || len % page_size) { |
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debug("SF: Erase offset/length not multiple of page size\n"); |
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return -1; |
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} |
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cmd[0] = CMD_AT45_ERASE_PAGE; |
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cmd[3] = 0x00; |
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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 += page_size) { |
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cmd[1] = page_addr >> (16 - page_shift); |
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cmd[2] = page_addr << (page_shift - 8); |
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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: AT45 page erase failed\n"); |
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goto out; |
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} |
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ret = at45_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT); |
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if (ret < 0) { |
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debug("SF: AT45 page erase timed out\n"); |
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goto out; |
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} |
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page_addr++; |
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} |
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debug("SF: AT45: Successfully erased %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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struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode) |
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{ |
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const struct atmel_spi_flash_params *params; |
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unsigned long page_size; |
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unsigned int family; |
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struct atmel_spi_flash *asf; |
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unsigned int i; |
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int ret; |
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u8 status; |
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for (i = 0; i < ARRAY_SIZE(atmel_spi_flash_table); i++) { |
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params = &atmel_spi_flash_table[i]; |
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if (params->idcode1 == idcode[1]) |
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break; |
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} |
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if (i == ARRAY_SIZE(atmel_spi_flash_table)) { |
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debug("SF: Unsupported DataFlash ID %02x\n", |
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idcode[1]); |
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return NULL; |
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} |
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asf = malloc(sizeof(struct atmel_spi_flash)); |
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if (!asf) { |
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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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asf->params = params; |
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asf->flash.spi = spi; |
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asf->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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family = idcode[1] >> 5; |
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switch (family) { |
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case DF_FAMILY_AT45: |
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/*
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* AT45 chips have configurable page size. The status |
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* register indicates which configuration is active. |
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*/ |
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ret = spi_flash_cmd(spi, CMD_AT45_READ_STATUS, &status, 1); |
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if (ret) |
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goto err; |
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debug("SF: AT45 status register: %02x\n", status); |
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if (!(status & AT45_STATUS_P2_PAGE_SIZE)) { |
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asf->flash.read = dataflash_read_fast_at45; |
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asf->flash.write = dataflash_write_at45; |
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asf->flash.erase = dataflash_erase_at45; |
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page_size += 1 << (params->l2_page_size - 5); |
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} else { |
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asf->flash.read = dataflash_read_fast_p2; |
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} |
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break; |
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case DF_FAMILY_AT26F: |
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case DF_FAMILY_AT26DF: |
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asf->flash.read = dataflash_read_fast_p2; |
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break; |
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default: |
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debug("SF: Unsupported DataFlash family %u\n", family); |
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goto err; |
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} |
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asf->flash.size = page_size * params->pages_per_block |
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* params->blocks_per_sector |
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* 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, page_size, asf->flash.size); |
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return &asf->flash; |
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err: |
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free(asf); |
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return NULL; |
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} |
@ -0,0 +1,162 @@ |
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/*
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* SPI flash interface |
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* |
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* Copyright (C) 2008 Atmel Corporation |
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*/ |
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#define DEBUG |
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#include <common.h> |
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#include <malloc.h> |
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#include <spi.h> |
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#include <spi_flash.h> |
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#include "spi_flash_internal.h" |
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int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len) |
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{ |
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unsigned long flags = SPI_XFER_BEGIN; |
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int ret; |
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if (len == 0) |
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flags |= SPI_XFER_END; |
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ret = spi_xfer(spi, 8, &cmd, NULL, flags); |
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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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if (len) { |
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ret = spi_xfer(spi, len * 8, NULL, response, SPI_XFER_END); |
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if (ret) |
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debug("SF: Failed to read response (%zu bytes): %d\n", |
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len, ret); |
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} |
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return ret; |
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} |
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int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd, |
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size_t cmd_len, void *data, size_t data_len) |
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{ |
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unsigned long flags = SPI_XFER_BEGIN; |
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int ret; |
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if (data_len == 0) |
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flags |= SPI_XFER_END; |
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ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags); |
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if (ret) { |
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debug("SF: Failed to send read command (%zu bytes): %d\n", |
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cmd_len, ret); |
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} else if (data_len != 0) { |
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ret = spi_xfer(spi, data_len * 8, NULL, data, SPI_XFER_END); |
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if (ret) |
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debug("SF: Failed to read %zu bytes of data: %d\n", |
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data_len, ret); |
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} |
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return ret; |
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} |
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int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len, |
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const void *data, size_t data_len) |
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{ |
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unsigned long flags = SPI_XFER_BEGIN; |
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int ret; |
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if (data_len == 0) |
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flags |= SPI_XFER_END; |
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ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags); |
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if (ret) { |
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debug("SF: Failed to send read command (%zu bytes): %d\n", |
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cmd_len, ret); |
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} else if (data_len != 0) { |
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ret = spi_xfer(spi, data_len * 8, data, NULL, SPI_XFER_END); |
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if (ret) |
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debug("SF: Failed to read %zu bytes of data: %d\n", |
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data_len, ret); |
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} |
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return ret; |
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} |
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int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd, |
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size_t cmd_len, void *data, size_t data_len) |
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{ |
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struct spi_slave *spi = flash->spi; |
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int ret; |
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spi_claim_bus(spi); |
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ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len); |
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spi_release_bus(spi); |
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return ret; |
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} |
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struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, |
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unsigned int max_hz, unsigned int spi_mode) |
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{ |
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struct spi_slave *spi; |
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struct spi_flash *flash; |
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int ret; |
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u8 idcode[3]; |
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spi = spi_setup_slave(bus, cs, max_hz, spi_mode); |
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if (!spi) { |
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debug("SF: Failed to set up slave\n"); |
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return NULL; |
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} |
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ret = spi_claim_bus(spi); |
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if (ret) { |
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debug("SF: Failed to claim SPI bus: %d\n", ret); |
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goto err_claim_bus; |
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} |
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/* Read the ID codes */ |
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ret = spi_flash_cmd(spi, CMD_READ_ID, &idcode, sizeof(idcode)); |
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if (ret) |
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goto err_read_id; |
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debug("SF: Got idcode %02x %02x %02x\n", idcode[0], |
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idcode[1], idcode[2]); |
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switch (idcode[0]) { |
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#ifdef CONFIG_SPI_FLASH_SPANSION |
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case 0x01: |
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flash = spi_flash_probe_spansion(spi, idcode); |
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break; |
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#endif |
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#ifdef CONFIG_SPI_FLASH_ATMEL |
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case 0x1F: |
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flash = spi_flash_probe_atmel(spi, idcode); |
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break; |
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#endif |
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default: |
||||
debug("SF: Unsupported manufacturer %02X\n", idcode[0]); |
||||
flash = NULL; |
||||
break; |
||||
} |
||||
|
||||
if (!flash) |
||||
goto err_manufacturer_probe; |
||||
|
||||
spi_release_bus(spi); |
||||
|
||||
return flash; |
||||
|
||||
err_manufacturer_probe: |
||||
err_read_id: |
||||
spi_release_bus(spi); |
||||
err_claim_bus: |
||||
spi_free_slave(spi); |
||||
return NULL; |
||||
} |
||||
|
||||
void spi_flash_free(struct spi_flash *flash) |
||||
{ |
||||
spi_free_slave(flash->spi); |
||||
free(flash); |
||||
} |
@ -0,0 +1,45 @@ |
||||
/*
|
||||
* SPI flash internal definitions |
||||
* |
||||
* Copyright (C) 2008 Atmel Corporation |
||||
*/ |
||||
|
||||
/* Common parameters */ |
||||
#define SPI_FLASH_PROG_TIMEOUT ((10 * CFG_HZ) / 1000) |
||||
#define SPI_FLASH_PAGE_ERASE_TIMEOUT ((50 * CFG_HZ) / 1000) |
||||
#define SPI_FLASH_SECTOR_ERASE_TIMEOUT (10 * CFG_HZ) |
||||
|
||||
/* Common commands */ |
||||
#define CMD_READ_ID 0x9f |
||||
|
||||
#define CMD_READ_ARRAY_SLOW 0x03 |
||||
#define CMD_READ_ARRAY_FAST 0x0b |
||||
#define CMD_READ_ARRAY_LEGACY 0xe8 |
||||
|
||||
/* Send a single-byte command to the device and read the response */ |
||||
int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len); |
||||
|
||||
/*
|
||||
* Send a multi-byte command to the device and read the response. Used |
||||
* for flash array reads, etc. |
||||
*/ |
||||
int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd, |
||||
size_t cmd_len, void *data, size_t data_len); |
||||
|
||||
/*
|
||||
* Send a multi-byte command to the device followed by (optional) |
||||
* data. Used for programming the flash array, etc. |
||||
*/ |
||||
int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len, |
||||
const void *data, size_t data_len); |
||||
|
||||
/*
|
||||
* Same as spi_flash_cmd_read() except it also claims/releases the SPI |
||||
* bus. Used as common part of the ->read() operation. |
||||
*/ |
||||
int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd, |
||||
size_t cmd_len, void *data, size_t data_len); |
||||
|
||||
/* Manufacturer-specific probe functions */ |
||||
struct spi_flash *spi_flash_probe_spansion(struct spi_slave *spi, u8 *idcode); |
||||
struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode); |
@ -0,0 +1,70 @@ |
||||
/*
|
||||
* Interface to SPI flash |
||||
* |
||||
* Copyright (C) 2008 Atmel Corporation |
||||
* |
||||
* See file CREDITS for list of people who contributed to this |
||||
* project. |
||||
* |
||||
* This program is free software; you can redistribute it and/or |
||||
* modify it under the terms of the GNU General Public License |
||||
* version 2 as published by the Free Software Foundation. |
||||
* |
||||
* This program is distributed in the hope that it will be useful, |
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||||
* GNU General Public License for more details. |
||||
* |
||||
* You should have received a copy of the GNU General Public License |
||||
* along with this program; if not, write to the Free Software |
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
||||
* MA 02111-1307 USA |
||||
*/ |
||||
#ifndef _SPI_FLASH_H_ |
||||
#define _SPI_FLASH_H_ |
||||
|
||||
#include <spi.h> |
||||
|
||||
struct spi_flash_region { |
||||
unsigned int count; |
||||
unsigned int size; |
||||
}; |
||||
|
||||
struct spi_flash { |
||||
struct spi_slave *spi; |
||||
|
||||
const char *name; |
||||
|
||||
u32 size; |
||||
|
||||
int (*read)(struct spi_flash *flash, u32 offset, |
||||
size_t len, void *buf); |
||||
int (*write)(struct spi_flash *flash, u32 offset, |
||||
size_t len, const void *buf); |
||||
int (*erase)(struct spi_flash *flash, u32 offset, |
||||
size_t len); |
||||
}; |
||||
|
||||
struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, |
||||
unsigned int max_hz, unsigned int spi_mode); |
||||
void spi_flash_free(struct spi_flash *flash); |
||||
|
||||
static inline int spi_flash_read(struct spi_flash *flash, u32 offset, |
||||
size_t len, void *buf) |
||||
{ |
||||
return flash->read(flash, offset, len, buf); |
||||
} |
||||
|
||||
static inline int spi_flash_write(struct spi_flash *flash, u32 offset, |
||||
size_t len, const void *buf) |
||||
{ |
||||
return flash->write(flash, offset, len, buf); |
||||
} |
||||
|
||||
static inline int spi_flash_erase(struct spi_flash *flash, u32 offset, |
||||
size_t len) |
||||
{ |
||||
return flash->erase(flash, offset, len); |
||||
} |
||||
|
||||
#endif /* _SPI_FLASH_H_ */ |
Loading…
Reference in new issue