blob: 76ad9a753453be7dbfa733df2dadf68034422a85 [file] [log] [blame]
/*
* This file is part of the flashprog 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.
*/
#include <stdbool.h>
#include "flash.h"
#include "chipdrivers.h"
#include "programmer.h"
#include "spi_command.h"
#include "spi.h"
static int spi_enter_exit_4ba(struct flashctx *const flash, const bool enter)
{
const unsigned char cmd = enter ? JEDEC_ENTER_4_BYTE_ADDR_MODE : JEDEC_EXIT_4_BYTE_ADDR_MODE;
int ret = 1;
if (flash->chip->feature_bits & FEATURE_4BA_ENTER)
ret = spi_send_command(flash, sizeof(cmd), 0, &cmd, NULL);
else if (flash->chip->feature_bits & FEATURE_4BA_ENTER_WREN)
ret = spi_simple_write_cmd(flash, cmd, 0);
else if (flash->chip->feature_bits & FEATURE_4BA_ENTER_EAR7)
ret = spi_set_extended_address(flash, enter ? 0x80 : 0x00);
if (!ret)
flash->in_4ba_mode = enter;
return ret;
}
static int spi_enter_4ba(struct flashctx *const flash)
{
return spi_enter_exit_4ba(flash, true);
}
static int spi_exit_4ba(struct flashctx *flash)
{
return spi_enter_exit_4ba(flash, false);
}
static int spi_prepare_4ba(struct flashctx *const flash)
{
flash->address_high_byte = -1;
flash->in_4ba_mode = false;
/* Be careful about 4BA chips and broken masters */
if (flash->chip->total_size > 16 * 1024 && spi_master_no_4ba_modes(flash)) {
/* If we can't use native instructions, bail out */
if ((flash->chip->feature_bits & FEATURE_4BA_NATIVE) != FEATURE_4BA_NATIVE
|| !spi_master_4ba(flash)) {
msg_cerr("Programmer doesn't support this chip. Aborting.\n");
return 1;
}
}
/* Enable/disable 4-byte addressing mode if flash chip supports it */
if (flash->chip->feature_bits & (FEATURE_4BA_ENTER | FEATURE_4BA_ENTER_WREN | FEATURE_4BA_ENTER_EAR7)) {
int ret;
if (spi_master_4ba(flash))
ret = spi_enter_4ba(flash);
else
ret = spi_exit_4ba(flash);
if (ret) {
msg_cerr("Failed to set correct 4BA mode! Aborting.\n");
return 1;
}
}
return 0;
}
int spi_prepare_io(struct flashctx *const flash, const enum preparation_steps prep)
{
if (prep != PREPARE_FULL)
return 0;
int ret = spi_prepare_4ba(flash);
if (ret)
return ret;
return 0;
}
void spi_finish_io(struct flashctx *const flash)
{
}