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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* 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; version 2 of the License
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <console/console.h>
#include "ec.h"
#include "ec_commands.h"
#include <spi-generic.h>
#include <timer.h>
static const uint8_t EcFramingByte = 0xec;
static int crosec_spi_io(uint8_t *write_bytes, size_t write_size,
uint8_t *read_bytes, size_t read_size,
void *context)
{
struct spi_slave *slave = (struct spi_slave *)context;
spi_claim_bus(slave);
if (spi_xfer(slave, write_bytes, write_size, NULL, 0)) {
printk(BIOS_ERR, "%s: Failed to send request.\n", __func__);
spi_release_bus(slave);
return -1;
}
uint8_t byte;
struct mono_time start;
struct rela_time rt;
timer_monotonic_get(&start);
while (1) {
if (spi_xfer(slave, NULL, 0, &byte, sizeof(byte))) {
printk(BIOS_ERR, "%s: Failed to receive byte.\n",
__func__);
spi_release_bus(slave);
return -1;
}
if (byte == EcFramingByte)
break;
// Wait 1s for a framing byte.
rt = current_time_from(&start);
if (rela_time_in_microseconds(&rt) > 1000 * 1000) {
printk(BIOS_ERR,
"%s: Timeout waiting for framing byte.\n",
__func__);
spi_release_bus(slave);
return -1;
}
}
if (spi_xfer(slave, NULL, 0, read_bytes, read_size)) {
printk(BIOS_ERR, "%s: Failed to receive response.\n", __func__);
spi_release_bus(slave);
return -1;
}
spi_release_bus(slave);
return 0;
}
int google_chromeec_command(struct chromeec_command *cec_command)
{
static struct spi_slave *slave = NULL;
if (!slave)
slave = spi_setup_slave(CONFIG_EC_GOOGLE_CHROMEEC_SPI_BUS,
CONFIG_EC_GOOGLE_CHROMEEC_SPI_CHIP);
return crosec_command_proto(cec_command, crosec_spi_io, slave);
}
#ifndef __PRE_RAM__
u8 google_chromeec_get_event(void)
{
printk(BIOS_ERR, "%s: Not supported.\n", __func__);
return 0;
}
#endif
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