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/* Copyright 2020 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* LCT (Long Countdown Timer) module for Chrome EC */
#include "console.h"
#include "hooks.h"
#include "lct_chip.h"
#include "registers.h"
#include "rtc.h"
#include "task.h"
#include "timer.h"
#include "util.h"
#define LCT_CLK_ENABLE_DELAY_USEC 150
#define CPRINTF(format, args...) cprintf(CC_CLOCK, format, ##args)
#define CPRINTS(format, args...) cprints(CC_CLOCK, format, ##args)
void npcx_lct_sel_power_src(enum NPCX_LCT_PWR_SRC pwr_src)
{
if (IS_BIT_SET(NPCX_LCTCONT, NPCX_LCTCONT_EN)) {
CPRINTS("Don't set power source when LCT is enabled");
return;
}
if (pwr_src == NPCX_LCT_PWR_SRC_VSBY)
SET_BIT(NPCX_LCTCONT, NPCX_LCTCONT_VSBY_PWR);
else
CLEAR_BIT(NPCX_LCTCONT, NPCX_LCTCONT_VSBY_PWR);
}
void npcx_lct_enable_clk(uint8_t enable)
{
if (IS_BIT_SET(NPCX_LCTCONT, NPCX_LCTCONT_EN)) {
CPRINTS("Don't set/unset clock when LCT is enabled");
return;
}
if (enable) {
SET_BIT(NPCX_LCTCONT, NPCX_LCTCONT_CLK_EN);
/*
* This bit must be set to 1 at least tLCTCKEN (150 us)
* before the LCT is enabled.
*/
udelay(LCT_CLK_ENABLE_DELAY_USEC);
} else {
CLEAR_BIT(NPCX_LCTCONT, NPCX_LCTCONT_CLK_EN);
}
}
void npcx_lct_enable(uint8_t enable)
{
enable = !!enable;
SET_FIELD(NPCX_LCTCONT, NPCX_LCTCONT_EN_FIELD, enable);
/* Wait until the bit value equals to what is set */
while (IS_BIT_SET(NPCX_LCTCONT, NPCX_LCTCONT_EN) != enable)
;
}
void npcx_lct_config(int seconds, int psl_ena, int int_ena)
{
if (IS_BIT_SET(NPCX_LCTCONT, NPCX_LCTCONT_EN)) {
CPRINTS("Don't config LCT when LCT is enabled");
return;
}
/* LCT can count max to (16 weeks - 1 second) */
if (seconds > NPCX_LCT_MAX) {
CPRINTS("LCT time is out of range");
return;
}
/* Clear pending LCT event first */
NPCX_LCTSTAT = BIT(NPCX_LCTSTAT_EVST);
NPCX_LCTWEEK = seconds / SECS_PER_WEEK;
seconds %= SECS_PER_WEEK;
NPCX_LCTDAY = seconds / SECS_PER_DAY;
seconds %= SECS_PER_DAY;
NPCX_LCTHOUR = seconds / SECS_PER_HOUR;
seconds %= SECS_PER_HOUR;
NPCX_LCTMINUTE = seconds / SECS_PER_MINUTE;
NPCX_LCTSECOND = seconds % SECS_PER_MINUTE;
if (psl_ena) {
if (IS_BIT_SET(NPCX_LCTCONT, NPCX_LCTCONT_VSBY_PWR))
SET_BIT(NPCX_LCTCONT, NPCX_LCTCONT_PSL_EN);
else
CPRINTS("LCT must source VSBY to support PSL wakeup");
}
if (int_ena)
SET_BIT(NPCX_LCTCONT, NPCX_LCTCONT_EVEN);
}
uint32_t npcx_lct_get_time(void)
{
uint32_t second;
uint8_t week, day, hour, minute;
do {
week = NPCX_LCTWEEK;
day = NPCX_LCTDAY;
hour = NPCX_LCTHOUR;
minute = NPCX_LCTMINUTE;
second = NPCX_LCTSECOND;
} while (week != NPCX_LCTWEEK || day != NPCX_LCTDAY ||
hour != NPCX_LCTHOUR || minute != NPCX_LCTMINUTE ||
second != NPCX_LCTSECOND);
second += minute * SECS_PER_MINUTE + hour * SECS_PER_HOUR +
day * SECS_PER_DAY + week * SECS_PER_WEEK;
return second;
}
void npcx_lct_clear_event(void)
{
NPCX_LCTSTAT = BIT(NPCX_LCTSTAT_EVST);
}
int npcx_lct_is_event_set(void)
{
return IS_BIT_SET(NPCX_LCTSTAT, NPCX_LCTSTAT_EVST);
}
static void npcx_lct_init(void)
{
/* Disable LCT */
npcx_lct_enable(0);
/* Clear control and status registers */
NPCX_LCTCONT = 0x0;
npcx_lct_clear_event();
/* Clear all timer registers */
NPCX_LCTSECOND = 0x0;
NPCX_LCTMINUTE = 0x0;
NPCX_LCTHOUR = 0x0;
NPCX_LCTDAY = 0x0;
NPCX_LCTWEEK = 0x0;
}
DECLARE_HOOK(HOOK_INIT, npcx_lct_init, HOOK_PRIO_DEFAULT);
#ifdef CONFIG_CMD_RTC_ALARM
static int command_lctalarm(int argc, const char **argv)
{
char *e;
int seconds;
seconds = strtoi(argv[1], &e, 0);
if (*e)
return EC_ERROR_PARAM2;
npcx_lct_enable(0);
npcx_lct_sel_power_src(NPCX_LCT_PWR_SRC_VSBY);
npcx_lct_enable_clk(1);
/* Enable LCT event interrupt and MIWU */
npcx_lct_config(seconds, 0, 1);
task_disable_irq(NPCX_IRQ_LCT_WKINTF_2);
/* Enable wake-up input sources & clear pending bit */
NPCX_WKPCL(MIWU_TABLE_2, LCT_WUI_GROUP) |= LCT_WUI_MASK;
NPCX_WKINEN(MIWU_TABLE_2, LCT_WUI_GROUP) |= LCT_WUI_MASK;
NPCX_WKEN(MIWU_TABLE_2, LCT_WUI_GROUP) |= LCT_WUI_MASK;
task_enable_irq(NPCX_IRQ_LCT_WKINTF_2);
npcx_lct_enable(1);
return 0;
}
DECLARE_CONSOLE_COMMAND(lctalarm, command_lctalarm, "", "");
#endif
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