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/* Copyright 2014 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.
*/
/* System module for Chrome EC : hardware specific implementation */
#include "common.h"
#include "console.h"
#include "ec_commands.h"
#include "registers.h"
#include "system.h"
#include "task.h"
#include "cpu.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_SYSTEM, outstr)
#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args)
const char *system_get_chip_vendor(void)
{
return "nrf";
}
const char *system_get_chip_name(void)
{
return "nrf51822";
}
const char *system_get_chip_revision(void)
{
return "";
}
void system_hibernate(uint32_t seconds, uint32_t microseconds)
{
/* Flush console before hibernating */
cflush();
if (board_hibernate)
board_hibernate();
/* chip specific standby mode */
CPRINTS("TODO: implement %s()", __func__);
}
static void check_reset_cause(void)
{
uint32_t flags = 0;
uint32_t raw_cause = NRF51_POWER_RESETREAS;
if (raw_cause & NRF51_POWER_RESETREAS_RESETPIN)
flags |= EC_RESET_FLAG_RESET_PIN;
if (raw_cause & NRF51_POWER_RESETREAS_DOG)
flags |= EC_RESET_FLAG_WATCHDOG;
/* Note that the programmer uses a soft reset in debug mode. */
if (raw_cause & NRF51_POWER_RESETREAS_SREQ)
flags |= EC_RESET_FLAG_SOFT;
if (raw_cause & (NRF51_POWER_RESETREAS_OFF |
NRF51_POWER_RESETREAS_LPCOMP))
flags |= EC_RESET_FLAG_WAKE_PIN;
if (raw_cause & (NRF51_POWER_RESETREAS_LOCKUP |
NRF51_POWER_RESETREAS_DIF))
flags |= EC_RESET_FLAG_OTHER;
system_set_reset_flags(flags);
/* clear it by writing 1's */
NRF51_POWER_RESETREAS = raw_cause;
}
static void system_watchdog_reset(void)
{
if (NRF51_WDT_TIMEOUT != 0) {
/* Hard reset the WDT */
NRF51_WDT_POWER = 0;
NRF51_WDT_POWER = 1;
}
/* NRF51_WDT_CONFIG_HALT_RUN breaks this */
NRF51_WDT_CONFIG = NRF51_WDT_CONFIG_SLEEP_RUN;
NRF51_WDT_RREN = NRF51_WDT_RREN_BIT(0);
NRF51_WDT_CRV = 3; /* @32KHz */
NRF51_WDT_START = 1;
}
void system_reset(int flags)
{
/* Disable interrupts to avoid task swaps during reboot */
interrupt_disable();
if (flags & SYSTEM_RESET_HARD)
/* Ask the watchdog to trigger a hard reboot */
system_watchdog_reset();
else {
/* Use SYSRESETREQ to trigger a soft reboot */
CPU_NVIC_APINT = 0x05fa0004;
}
/* Spin and wait for reboot; should never return */
while (1)
;
}
int system_get_bbram(enum system_bbram_idx idx, uint8_t *value)
{
CPRINTS("TODO: implement %s()", __func__);
return EC_ERROR_UNIMPLEMENTED;
}
int system_set_bbram(enum system_bbram_idx idx, uint8_t value)
{
CPRINTS("TODO: implement %s()", __func__);
return EC_ERROR_UNIMPLEMENTED;
}
void system_pre_init(void)
{
check_reset_cause();
}
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