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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Main routine for Chrome EC
*/
#include "board_config.h"
#include "clock.h"
#include "common.h"
#include "console.h"
#include "cpu.h"
#include "eeprom.h"
#include "eoption.h"
#include "flash.h"
#include "gpio.h"
#include "hooks.h"
#include "jtag.h"
#include "keyboard_scan.h"
#include "system.h"
#include "task.h"
#include "timer.h"
#include "uart.h"
#include "watchdog.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_SYSTEM, outstr)
#define CPRINTF(format, args...) cprintf(CC_SYSTEM, format, ## args)
int main(void)
{
/*
* Pre-initialization (pre-verified boot) stage. Initialization at
* this level should do as little as possible, because verified boot
* may need to jump to another image, which will repeat this
* initialization. In particular, modules should NOT enable
* interrupts.
*/
#ifdef CONFIG_BOARD_PRE_INIT
board_config_pre_init();
#endif
/* Configure the pin multiplexers and GPIOs */
jtag_pre_init();
gpio_pre_init();
#ifdef CONFIG_BOARD_POST_GPIO_INIT
board_config_post_gpio_init();
#endif
/*
* Initialize interrupts, but don't enable any of them. Note that
* task scheduling is not enabled until task_start() below.
*/
task_pre_init();
/*
* Initialize the system module. This enables the hibernate clock
* source we need to calibrate the internal oscillator.
*/
system_pre_init();
system_common_pre_init();
#ifdef CONFIG_FLASH
/*
* Initialize flash and apply write protect if necessary. Requires
* the reset flags calculated by system initialization.
*/
flash_pre_init();
#endif
/* Set the CPU clocks / PLLs. System is now running at full speed. */
clock_init();
/*
* Initialize timer. Everything after this can be benchmarked.
* get_time() and udelay() may now be used. usleep() requires task
* scheduling, so cannot be used yet. Note that interrupts declared
* via DECLARE_IRQ() call timer routines when profiling is enabled, so
* timer init() must be before uart_init().
*/
timer_init();
/* Main initialization stage. Modules may enable interrupts here. */
cpu_init();
/* Initialize UART. Console output functions may now be used. */
uart_init();
if (system_jumped_to_this_image()) {
CPRINTF("[%T UART initialized after sysjump]\n");
} else {
CPUTS("\n\n--- UART initialized after reboot ---\n");
CPUTS("[Reset cause: ");
system_print_reset_flags();
CPUTS("]\n");
}
CPRINTF("[Image: %s, %s]\n",
system_get_image_copy_string(), system_get_build_info());
#ifdef CONFIG_WATCHDOG
/*
* Intialize watchdog timer. All lengthy operations between now and
* task_start() must periodically call watchdog_reload() to avoid
* triggering a watchdog reboot. (This pretty much applies only to
* verified boot, because all *other* lengthy operations should be done
* by tasks.)
*/
watchdog_init();
#endif
/*
* Verified boot needs to read the initial keyboard state and EEPROM
* contents. EEPROM must be up first, so keyboard_scan can toggle
* debugging settings via keys held at boot.
*/
#ifdef CONFIG_EEPROM
eeprom_init();
#endif
#ifdef CONFIG_EOPTION
eoption_init();
#endif
#ifdef HAS_TASK_KEYSCAN
keyboard_scan_init();
#endif
/* Initialize the hook library. This calls HOOK_INIT hooks. */
hook_init();
/*
* Print the init time. Not completely accurate because it can't take
* into account the time before timer_init(), but it'll at least catch
* the majority of the time.
*/
CPRINTF("[%T Inits done]\n");
/* Launch task scheduling (never returns) */
return task_start();
}
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