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/*
* SPI flash interface
*
* Copyright (C) 2008 Atmel Corporation
* Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
*
* Licensed under the GPL-2 or later.
*/
#include <cpu/x86/smm.h>
#include <delay.h>
#include <stdlib.h>
#include <string.h>
#include <spi-generic.h>
#include <spi_flash.h>
#include "spi_flash_internal.h"
#include <timer.h>
static void spi_flash_addr(u32 addr, u8 *cmd)
{
/* cmd[0] is actual command */
cmd[1] = addr >> 16;
cmd[2] = addr >> 8;
cmd[3] = addr >> 0;
}
/*
* If atomic sequencing is used, the cycle type is known to the SPI
* controller so that it can perform consecutive transfers and arbitrate
* automatically. Otherwise the SPI controller transfers whatever the
* user requests immediately, without regard to sequence. Atomic
* sequencing is commonly used on x86 platforms.
*
* SPI flash commands are simple two-step sequences. The command byte is
* always written first and may be followed by an address. Then data is
* either read or written. For atomic sequencing we'll pass everything into
* spi_xfer() at once and let the controller handle the details. Otherwise
* we will write all output bytes first and then read if necessary.
*
* FIXME: This really should be abstracted better, but that will
* require overhauling the entire SPI infrastructure.
*/
static int do_spi_flash_cmd(struct spi_slave *spi, const void *dout,
unsigned int bytes_out, void *din, unsigned int bytes_in)
{
int ret = 1;
#if CONFIG_SPI_ATOMIC_SEQUENCING == 1
if (spi_xfer(spi, dout, bytes_out, din, bytes_in) < 0)
goto done;
#else
if (dout && bytes_out) {
if (spi_xfer(spi, dout, bytes_out, NULL, 0) < 0)
goto done;
}
if (din && bytes_in) {
if (spi_xfer(spi, NULL, 0, din, bytes_in) < 0)
goto done;
}
#endif
ret = 0;
done:
return ret;
}
int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
{
int ret = do_spi_flash_cmd(spi, &cmd, sizeof(cmd), response, len);
if (ret)
printk(BIOS_WARNING, "SF: Failed to send command %02x: %d\n", cmd, 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)
{
int ret = do_spi_flash_cmd(spi, cmd, cmd_len, data, data_len);
if (ret) {
printk(BIOS_WARNING, "SF: Failed to send read command (%zu bytes): %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)
{
int ret;
u8 buff[cmd_len + data_len];
memcpy(buff, cmd, cmd_len);
memcpy(buff + cmd_len, data, data_len);
ret = do_spi_flash_cmd(spi, buff, cmd_len + data_len, NULL, 0);
if (ret) {
printk(BIOS_WARNING, "SF: Failed to send write command (%zu bytes): %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->rw = SPI_READ_FLAG;
spi_claim_bus(spi);
ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len);
spi_release_bus(spi);
return ret;
}
int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
size_t len, void *data)
{
struct spi_slave *spi = flash->spi;
u8 cmd[5];
cmd[0] = CMD_READ_ARRAY_FAST;
spi_flash_addr(offset, cmd);
cmd[4] = 0x00;
return spi_flash_cmd_read(spi, cmd, sizeof(cmd), data, len);
}
int spi_flash_cmd_read_slow(struct spi_flash *flash, u32 offset,
size_t len, void *data)
{
struct spi_slave *spi = flash->spi;
u8 cmd[4];
cmd[0] = CMD_READ_ARRAY_SLOW;
spi_flash_addr(offset, cmd);
return spi_flash_cmd_read(spi, cmd, sizeof(cmd), data, len);
}
int spi_flash_cmd_poll_bit(struct spi_flash *flash, unsigned long timeout,
u8 cmd, u8 poll_bit)
{
struct spi_slave *spi = flash->spi;
int ret;
u8 status;
struct mono_time current, end;
timer_monotonic_get(¤t);
end = current;
mono_time_add_msecs(&end, timeout);
do {
ret = spi_flash_cmd_read(spi, &cmd, 1, &status, 1);
if (ret)
return -1;
if ((status & poll_bit) == 0)
return 0;
timer_monotonic_get(¤t);
} while (!mono_time_after(¤t, &end));
printk(BIOS_DEBUG, "SF: timeout at %ld msec\n",timeout);
return -1;
}
int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
{
return spi_flash_cmd_poll_bit(flash, timeout,
CMD_READ_STATUS, STATUS_WIP);
}
int spi_flash_cmd_erase(struct spi_flash *flash, u8 erase_cmd,
u32 offset, size_t len)
{
u32 start, end, erase_size;
int ret;
u8 cmd[4];
erase_size = flash->sector_size;
if (offset % erase_size || len % erase_size) {
printk(BIOS_WARNING, "SF: Erase offset/length not multiple of erase size\n");
return -1;
}
flash->spi->rw = SPI_WRITE_FLAG;
ret = spi_claim_bus(flash->spi);
if (ret) {
printk(BIOS_WARNING, "SF: Unable to claim SPI bus\n");
return ret;
}
cmd[0] = erase_cmd;
start = offset;
end = start + len;
while (offset < end) {
spi_flash_addr(offset, cmd);
offset += erase_size;
#if CONFIG_DEBUG_SPI_FLASH
printk(BIOS_SPEW, "SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
cmd[2], cmd[3], offset);
#endif
ret = spi_flash_cmd(flash->spi, CMD_WRITE_ENABLE, NULL, 0);
if (ret)
goto out;
ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), NULL, 0);
if (ret)
goto out;
ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
if (ret)
goto out;
}
printk(BIOS_DEBUG, "SF: Successfully erased %zu bytes @ %#x\n", len, start);
out:
spi_release_bus(flash->spi);
return ret;
}
/*
* The following table holds all device probe functions
*
* shift: number of continuation bytes before the ID
* idcode: the expected IDCODE or 0xff for non JEDEC devices
* probe: the function to call
*
* Non JEDEC devices should be ordered in the table such that
* the probe functions with best detection algorithms come first.
*
* Several matching entries are permitted, they will be tried
* in sequence until a probe function returns non NULL.
*
* IDCODE_CONT_LEN may be redefined if a device needs to declare a
* larger "shift" value. IDCODE_PART_LEN generally shouldn't be
* changed. This is the max number of bytes probe functions may
* examine when looking up part-specific identification info.
*
* Probe functions will be given the idcode buffer starting at their
* manu id byte (the "idcode" in the table below). In other words,
* all of the continuation bytes will be skipped (the "shift" below).
*/
#define IDCODE_CONT_LEN 0
#define IDCODE_PART_LEN 5
static struct {
const u8 shift;
const u8 idcode;
struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode);
} flashes[] = {
/* Keep it sorted by define name */
#if CONFIG_SPI_FLASH_AMIC
{ 0, 0x37, spi_flash_probe_amic, },
#endif
#if CONFIG_SPI_FLASH_ATMEL
{ 0, 0x1f, spi_flash_probe_atmel, },
#endif
#if CONFIG_SPI_FLASH_EON
{ 0, 0x1c, spi_flash_probe_eon, },
#endif
#if CONFIG_SPI_FLASH_GIGADEVICE
{ 0, 0xc8, spi_flash_probe_gigadevice, },
#endif
#if CONFIG_SPI_FLASH_MACRONIX
{ 0, 0xc2, spi_flash_probe_macronix, },
#endif
#if CONFIG_SPI_FLASH_SPANSION
{ 0, 0x01, spi_flash_probe_spansion, },
#endif
#if CONFIG_SPI_FLASH_SST
{ 0, 0xbf, spi_flash_probe_sst, },
#endif
#if CONFIG_SPI_FLASH_STMICRO
{ 0, 0x20, spi_flash_probe_stmicro, },
#endif
#if CONFIG_SPI_FLASH_WINBOND
{ 0, 0xef, spi_flash_probe_winbond, },
#endif
/* Keep it sorted by best detection */
#if CONFIG_SPI_FLASH_STMICRO
{ 0, 0xff, spi_flash_probe_stmicro, },
#endif
#if CONFIG_SPI_FLASH_ADESTO
{ 0, 0x1f, spi_flash_probe_adesto, },
#endif
};
#define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN)
struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs)
{
struct spi_slave *spi;
struct spi_flash *flash = NULL;
int ret, i, shift;
u8 idcode[IDCODE_LEN], *idp;
spi = spi_setup_slave(bus, cs);
if (!spi) {
printk(BIOS_WARNING, "SF: Failed to set up slave\n");
return NULL;
}
spi->rw = SPI_READ_FLAG;
ret = spi_claim_bus(spi);
if (ret) {
printk(BIOS_WARNING, "SF: Failed to claim SPI bus: %d\n", ret);
goto err_claim_bus;
}
if (spi->force_programmer_specific && spi->programmer_specific_probe) {
flash = spi->programmer_specific_probe (spi);
if (!flash)
goto err_read_id;
goto flash_detected;
}
/* Read the ID codes */
ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode));
if (ret)
goto err_read_id;
#if CONFIG_DEBUG_SPI_FLASH
printk(BIOS_SPEW, "SF: Got idcode: ");
for (i = 0; i < sizeof(idcode); i++)
printk(BIOS_SPEW, "%02x ", idcode[i]);
printk(BIOS_SPEW, "\n");
#endif
/* count the number of continuation bytes */
for (shift = 0, idp = idcode;
shift < IDCODE_CONT_LEN && *idp == 0x7f;
++shift, ++idp)
continue;
/* search the table for matches in shift and id */
for (i = 0; i < ARRAY_SIZE(flashes); ++i)
if (flashes[i].shift == shift && flashes[i].idcode == *idp) {
#if CONFIG_SMM_TSEG && defined(__SMM__)
/* Need to relocate this function */
tseg_relocate((void **)&flashes[i].probe);
#endif
/* we have a match, call probe */
flash = flashes[i].probe(spi, idp);
if (flash)
break;
}
if (!flash && spi->programmer_specific_probe) {
#if CONFIG_SMM_TSEG && defined(__SMM__)
/* Need to relocate this function */
tseg_relocate((void **)&spi->programmer_specific_probe);
#endif
flash = spi->programmer_specific_probe (spi);
}
if (!flash) {
printk(BIOS_WARNING, "SF: Unsupported manufacturer %02x\n", *idp);
goto err_manufacturer_probe;
}
flash_detected:
#if CONFIG_SMM_TSEG && defined(__SMM__)
/* Ensure flash handlers are valid for TSEG */
tseg_relocate((void **)&flash->read);
tseg_relocate((void **)&flash->write);
tseg_relocate((void **)&flash->erase);
tseg_relocate((void **)&flash->name);
#endif
printk(BIOS_INFO, "SF: Detected %s with page size %x, total %x\n",
flash->name, flash->sector_size, flash->size);
spi_release_bus(spi);
return flash;
err_manufacturer_probe:
err_read_id:
spi_release_bus(spi);
err_claim_bus:
return NULL;
}
|