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SPI Flash subsystem

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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 2008-05-16 11:10:33 +02:00 committed by Wolfgang Denk
parent 60445cb5c3
commit d25ce7d24c
6 changed files with 688 additions and 0 deletions
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2
Makefile
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@ -224,6 +224,7 @@ LIBS += drivers/mtd/libmtd.a
LIBS += drivers/mtd/nand/libnand.a
LIBS += drivers/mtd/nand_legacy/libnand_legacy.a
LIBS += drivers/mtd/onenand/libonenand.a
LIBS += drivers/mtd/spi/libspi_flash.a
LIBS += drivers/net/libnet.a
LIBS += drivers/net/sk98lin/libsk98lin.a
LIBS += drivers/pci/libpci.a
@ -390,6 +391,7 @@ TAG_SUBDIRS += drivers/mtd
TAG_SUBDIRS += drivers/mtd/nand
TAG_SUBDIRS += drivers/mtd/nand_legacy
TAG_SUBDIRS += drivers/mtd/onenand
TAG_SUBDIRS += drivers/mtd/spi
TAG_SUBDIRS += drivers/net
TAG_SUBDIRS += drivers/net/sk98lin
TAG_SUBDIRS += drivers/pci

47
drivers/mtd/spi/Makefile Normal file
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@ -0,0 +1,47 @@
#
# (C) Copyright 2006
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# 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 as
# published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
#
# 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
#
include $(TOPDIR)/config.mk
LIB := $(obj)libspi_flash.a
COBJS-$(CONFIG_SPI_FLASH) += spi_flash.o
COBJS-$(CONFIG_SPI_FLASH_ATMEL) += atmel.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))
all: $(LIB)
$(LIB): $(obj).depend $(OBJS)
$(AR) $(ARFLAGS) $@ $(OBJS)
#########################################################################
# defines $(obj).depend target
include $(SRCTREE)/rules.mk
sinclude $(obj).depend
#########################################################################

362
drivers/mtd/spi/atmel.c Normal file
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@ -0,0 +1,362 @@
/*
* Atmel SPI DataFlash support
*
* Copyright (C) 2008 Atmel Corporation
*/
#define DEBUG
#include <common.h>
#include <malloc.h>
#include <spi_flash.h>
#include "spi_flash_internal.h"
/* AT45-specific commands */
#define CMD_AT45_READ_STATUS 0xd7
#define CMD_AT45_ERASE_PAGE 0x81
#define CMD_AT45_LOAD_PROG_BUF1 0x82
#define CMD_AT45_LOAD_BUF1 0x84
#define CMD_AT45_LOAD_PROG_BUF2 0x85
#define CMD_AT45_LOAD_BUF2 0x87
#define CMD_AT45_PROG_BUF1 0x88
#define CMD_AT45_PROG_BUF2 0x89
/* AT45 status register bits */
#define AT45_STATUS_P2_PAGE_SIZE (1 << 0)
#define AT45_STATUS_READY (1 << 7)
/* DataFlash family IDs, as obtained from the second idcode byte */
#define DF_FAMILY_AT26F 0
#define DF_FAMILY_AT45 1
#define DF_FAMILY_AT26DF 2 /* AT25DF and AT26DF */
struct atmel_spi_flash_params {
u8 idcode1;
/* Log2 of page size in power-of-two mode */
u8 l2_page_size;
u8 pages_per_block;
u8 blocks_per_sector;
u8 nr_sectors;
const char *name;
};
struct atmel_spi_flash {
const struct atmel_spi_flash_params *params;
struct spi_flash flash;
};
static inline struct atmel_spi_flash *
to_atmel_spi_flash(struct spi_flash *flash)
{
return container_of(flash, struct atmel_spi_flash, flash);
}
static const struct atmel_spi_flash_params atmel_spi_flash_table[] = {
{
.idcode1 = 0x28,
.l2_page_size = 10,
.pages_per_block = 8,
.blocks_per_sector = 32,
.nr_sectors = 32,
.name = "AT45DB642D",
},
};
static int at45_wait_ready(struct spi_flash *flash, unsigned long timeout)
{
struct spi_slave *spi = flash->spi;
unsigned long timebase;
int ret;
u8 cmd = CMD_AT45_READ_STATUS;
u8 status;
timebase = get_timer(0);
ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN);
if (ret)
return -1;
do {
ret = spi_xfer(spi, 8, NULL, &status, 0);
if (ret)
return -1;
if (status & AT45_STATUS_READY)
break;
} while (get_timer(timebase) < timeout);
/* Deactivate CS */
spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
if (status & AT45_STATUS_READY)
return 0;
/* Timed out */
return -1;
}
/*
* Assemble the address part of a command for AT45 devices in
* non-power-of-two page size mode.
*/
static void at45_build_address(struct atmel_spi_flash *asf, u8 *cmd, u32 offset)
{
unsigned long page_addr;
unsigned long byte_addr;
unsigned long page_size;
unsigned int page_shift;
/*
* The "extra" space per page is the power-of-two page size
* divided by 32.
*/
page_shift = asf->params->l2_page_size;
page_size = (1 << page_shift) + (1 << (page_shift - 5));
page_shift++;
page_addr = offset / page_size;
byte_addr = offset % page_size;
cmd[0] = page_addr >> (16 - page_shift);
cmd[1] = page_addr << (page_shift - 8) | (byte_addr >> 8);
cmd[2] = byte_addr;
}
static int dataflash_read_fast_p2(struct spi_flash *flash,
u32 offset, size_t len, void *buf)
{
u8 cmd[5];
cmd[0] = CMD_READ_ARRAY_FAST;
cmd[1] = offset >> 16;
cmd[2] = offset >> 8;
cmd[3] = offset;
cmd[4] = 0x00;
return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
}
static int dataflash_read_fast_at45(struct spi_flash *flash,
u32 offset, size_t len, void *buf)
{
struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
u8 cmd[5];
cmd[0] = CMD_READ_ARRAY_FAST;
at45_build_address(asf, cmd + 1, offset);
cmd[4] = 0x00;
return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
}
static int dataflash_write_at45(struct spi_flash *flash,
u32 offset, size_t len, const void *buf)
{
struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
unsigned long page_addr;
unsigned long byte_addr;
unsigned long page_size;
unsigned int page_shift;
size_t chunk_len;
size_t actual;
int ret;
u8 cmd[4];
page_shift = asf->params->l2_page_size;
page_size = (1 << page_shift) + (1 << (page_shift - 5));
page_shift++;
page_addr = offset / page_size;
byte_addr = offset % page_size;
ret = spi_claim_bus(flash->spi);
if (ret) {
debug("SF: Unable to claim SPI bus\n");
return ret;
}
for (actual = 0; actual < len; actual += chunk_len) {
chunk_len = min(len - actual, page_size - byte_addr);
/* Use the same address bits for both commands */
cmd[0] = CMD_AT45_LOAD_BUF1;
cmd[1] = page_addr >> (16 - page_shift);
cmd[2] = page_addr << (page_shift - 8) | (byte_addr >> 8);
cmd[3] = byte_addr;
ret = spi_flash_cmd_write(flash->spi, cmd, 4,
buf + actual, chunk_len);
if (ret < 0) {
debug("SF: Loading AT45 buffer failed\n");
goto out;
}
cmd[0] = CMD_AT45_PROG_BUF1;
ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
if (ret < 0) {
debug("SF: AT45 page programming failed\n");
goto out;
}
ret = at45_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
if (ret < 0) {
debug("SF: AT45 page programming timed out\n");
goto out;
}
page_addr++;
byte_addr = 0;
}
debug("SF: AT45: Successfully programmed %u bytes @ 0x%x\n",
len, offset);
ret = 0;
out:
spi_release_bus(flash->spi);
return ret;
}
int dataflash_erase_at45(struct spi_flash *flash, u32 offset, size_t len)
{
struct atmel_spi_flash *asf = to_atmel_spi_flash(flash);
unsigned long page_addr;
unsigned long page_size;
unsigned int page_shift;
size_t actual;
int ret;
u8 cmd[4];
/*
* TODO: This function currently uses page erase only. We can
* probably speed things up by using block and/or sector erase
* when possible.
*/
page_shift = asf->params->l2_page_size;
page_size = (1 << page_shift) + (1 << (page_shift - 5));
page_shift++;
page_addr = offset / page_size;
if (offset % page_size || len % page_size) {
debug("SF: Erase offset/length not multiple of page size\n");
return -1;
}
cmd[0] = CMD_AT45_ERASE_PAGE;
cmd[3] = 0x00;
ret = spi_claim_bus(flash->spi);
if (ret) {
debug("SF: Unable to claim SPI bus\n");
return ret;
}
for (actual = 0; actual < len; actual += page_size) {
cmd[1] = page_addr >> (16 - page_shift);
cmd[2] = page_addr << (page_shift - 8);
ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
if (ret < 0) {
debug("SF: AT45 page erase failed\n");
goto out;
}
ret = at45_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
if (ret < 0) {
debug("SF: AT45 page erase timed out\n");
goto out;
}
page_addr++;
}
debug("SF: AT45: Successfully erased %u bytes @ 0x%x\n",
len, offset);
ret = 0;
out:
spi_release_bus(flash->spi);
return ret;
}
struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode)
{
const struct atmel_spi_flash_params *params;
unsigned long page_size;
unsigned int family;
struct atmel_spi_flash *asf;
unsigned int i;
int ret;
u8 status;
for (i = 0; i < ARRAY_SIZE(atmel_spi_flash_table); i++) {
params = &atmel_spi_flash_table[i];
if (params->idcode1 == idcode[1])
break;
}
if (i == ARRAY_SIZE(atmel_spi_flash_table)) {
debug("SF: Unsupported DataFlash ID %02x\n",
idcode[1]);
return NULL;
}
asf = malloc(sizeof(struct atmel_spi_flash));
if (!asf) {
debug("SF: Failed to allocate memory\n");
return NULL;
}
asf->params = params;
asf->flash.spi = spi;
asf->flash.name = params->name;
/* Assuming power-of-two page size initially. */
page_size = 1 << params->l2_page_size;
family = idcode[1] >> 5;
switch (family) {
case DF_FAMILY_AT45:
/*
* AT45 chips have configurable page size. The status
* register indicates which configuration is active.
*/
ret = spi_flash_cmd(spi, CMD_AT45_READ_STATUS, &status, 1);
if (ret)
goto err;
debug("SF: AT45 status register: %02x\n", status);
if (!(status & AT45_STATUS_P2_PAGE_SIZE)) {
asf->flash.read = dataflash_read_fast_at45;
asf->flash.write = dataflash_write_at45;
asf->flash.erase = dataflash_erase_at45;
page_size += 1 << (params->l2_page_size - 5);
} else {
asf->flash.read = dataflash_read_fast_p2;
}
break;
case DF_FAMILY_AT26F:
case DF_FAMILY_AT26DF:
asf->flash.read = dataflash_read_fast_p2;
break;
default:
debug("SF: Unsupported DataFlash family %u\n", family);
goto err;
}
asf->flash.size = page_size * params->pages_per_block
* params->blocks_per_sector
* params->nr_sectors;
debug("SF: Detected %s with page size %u, total %u bytes\n",
params->name, page_size, asf->flash.size);
return &asf->flash;
err:
free(asf);
return NULL;
}

162
drivers/mtd/spi/spi_flash.c Normal file
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@ -0,0 +1,162 @@
/*
* SPI flash interface
*
* Copyright (C) 2008 Atmel Corporation
*/
#define DEBUG
#include <common.h>
#include <malloc.h>
#include <spi.h>
#include <spi_flash.h>
#include "spi_flash_internal.h"
int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
{
unsigned long flags = SPI_XFER_BEGIN;
int ret;
if (len == 0)
flags |= SPI_XFER_END;
ret = spi_xfer(spi, 8, &cmd, NULL, flags);
if (ret) {
debug("SF: Failed to send command %02x: %d\n", cmd, ret);
return ret;
}
if (len) {
ret = spi_xfer(spi, len * 8, NULL, response, SPI_XFER_END);
if (ret)
debug("SF: Failed to read response (%zu bytes): %d\n",
len, ret);
}
return ret;
}
int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
size_t cmd_len, 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, NULL, data, SPI_XFER_END);
if (ret)
debug("SF: Failed to read %zu bytes of data: %d\n",
data_len, ret);
}
return ret;
}
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);
}

45
drivers/mtd/spi/spi_flash_internal.h Normal file
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@ -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);

70
include/spi_flash.h Normal file
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@ -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_ */