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/*
* 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);
}
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