SPI Flash subsystem
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>
This commit is contained in:
Haavard Skinnemoen
Wolfgang Denk
parent
60445cb5c3
commit
d25ce7d24c
2
Makefile
2
Makefile
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@ -224,6 +224,7 @@ LIBS += drivers/mtd/libmtd.a
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LIBS += drivers/mtd/nand/libnand.a
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LIBS += drivers/mtd/nand_legacy/libnand_legacy.a
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LIBS += drivers/mtd/onenand/libonenand.a
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LIBS += drivers/mtd/spi/libspi_flash.a
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LIBS += drivers/net/libnet.a
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LIBS += drivers/net/sk98lin/libsk98lin.a
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LIBS += drivers/pci/libpci.a
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@ -390,6 +391,7 @@ TAG_SUBDIRS += drivers/mtd
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TAG_SUBDIRS += drivers/mtd/nand
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TAG_SUBDIRS += drivers/mtd/nand_legacy
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TAG_SUBDIRS += drivers/mtd/onenand
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TAG_SUBDIRS += drivers/mtd/spi
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TAG_SUBDIRS += drivers/net
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TAG_SUBDIRS += drivers/net/sk98lin
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TAG_SUBDIRS += drivers/pci
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@ -0,0 +1,47 @@
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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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|
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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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|
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err:
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free(asf);
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return NULL;
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}
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|
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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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|
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#include "spi_flash_internal.h"
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|
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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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|
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if (len == 0)
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flags |= SPI_XFER_END;
|
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|
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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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|
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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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unsigned long flags = SPI_XFER_BEGIN;
|
||||
int ret;
|
||||
|
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if (data_len == 0)
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flags |= SPI_XFER_END;
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||||
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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);
|
||||
if (ret)
|
||||
debug("SF: Failed to read %zu bytes of data: %d\n",
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||||
data_len, ret);
|
||||
}
|
||||
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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,
|
||||
const void *data, size_t data_len)
|
||||
{
|
||||
unsigned long flags = SPI_XFER_BEGIN;
|
||||
int ret;
|
||||
|
||||
if (data_len == 0)
|
||||
flags |= SPI_XFER_END;
|
||||
|
||||
ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
|
||||
if (ret) {
|
||||
debug("SF: Failed to send read command (%zu bytes): %d\n",
|
||||
cmd_len, ret);
|
||||
} else if (data_len != 0) {
|
||||
ret = spi_xfer(spi, data_len * 8, data, NULL, SPI_XFER_END);
|
||||
if (ret)
|
||||
debug("SF: Failed to read %zu bytes of data: %d\n",
|
||||
data_len, ret);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
|
||||
size_t cmd_len, void *data, size_t data_len)
|
||||
{
|
||||
struct spi_slave *spi = flash->spi;
|
||||
int ret;
|
||||
|
||||
spi_claim_bus(spi);
|
||||
ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len);
|
||||
spi_release_bus(spi);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
|
||||
unsigned int max_hz, unsigned int spi_mode)
|
||||
{
|
||||
struct spi_slave *spi;
|
||||
struct spi_flash *flash;
|
||||
int ret;
|
||||
u8 idcode[3];
|
||||
|
||||
spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
|
||||
if (!spi) {
|
||||
debug("SF: Failed to set up slave\n");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
ret = spi_claim_bus(spi);
|
||||
if (ret) {
|
||||
debug("SF: Failed to claim SPI bus: %d\n", ret);
|
||||
goto err_claim_bus;
|
||||
}
|
||||
|
||||
/* Read the ID codes */
|
||||
ret = spi_flash_cmd(spi, CMD_READ_ID, &idcode, sizeof(idcode));
|
||||
if (ret)
|
||||
goto err_read_id;
|
||||
|
||||
debug("SF: Got idcode %02x %02x %02x\n", idcode[0],
|
||||
idcode[1], idcode[2]);
|
||||
|
||||
switch (idcode[0]) {
|
||||
#ifdef CONFIG_SPI_FLASH_SPANSION
|
||||
case 0x01:
|
||||
flash = spi_flash_probe_spansion(spi, idcode);
|
||||
break;
|
||||
#endif
|
||||
#ifdef CONFIG_SPI_FLASH_ATMEL
|
||||
case 0x1F:
|
||||
flash = spi_flash_probe_atmel(spi, idcode);
|
||||
break;
|
||||
#endif
|
||||
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