| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <soc/rtc_common.h> |
| #include <soc/rtc.h> |
| #include <soc/pmic_wrap.h> |
| #include <timer.h> |
| |
| /* ensure rtc write success */ |
| int rtc_busy_wait(void) |
| { |
| struct stopwatch sw; |
| u16 bbpu; |
| |
| stopwatch_init_usecs_expire(&sw, RTC_CBUSY_TIMEOUT_US); |
| |
| do { |
| rtc_read(RTC_BBPU, &bbpu); |
| /* Time > 1sec, time out and set recovery mode enable.*/ |
| if (stopwatch_expired(&sw)) { |
| rtc_info("BBPU CBUSY time out !!\n"); |
| return 0; |
| } |
| } while (bbpu & RTC_BBPU_CBUSY); |
| |
| return 1; |
| } |
| |
| int rtc_write_trigger(void) |
| { |
| rtc_write(RTC_WRTGR, 1); |
| return rtc_busy_wait(); |
| } |
| |
| /* unlock rtc write interface */ |
| int rtc_writeif_unlock(void) |
| { |
| rtc_write(RTC_PROT, RTC_PROT_UNLOCK1); |
| if (!rtc_write_trigger()) |
| return 0; |
| rtc_write(RTC_PROT, RTC_PROT_UNLOCK2); |
| if (!rtc_write_trigger()) |
| return 0; |
| |
| return 1; |
| } |
| |
| /* set rtc time */ |
| int rtc_set(const struct rtc_time *time) |
| { |
| return -1; |
| } |
| |
| /* get rtc time */ |
| int rtc_get(struct rtc_time *time) |
| { |
| u16 value; |
| |
| rtc_read(RTC_TC_SEC, &value); |
| time->sec = value; |
| rtc_read(RTC_TC_MIN, &value); |
| time->min = value; |
| rtc_read(RTC_TC_HOU, &value); |
| time->hour = value; |
| rtc_read(RTC_TC_DOM, &value); |
| time->mday = value; |
| rtc_read(RTC_TC_MTH, &value); |
| time->mon = value; |
| rtc_read(RTC_TC_YEA, &value); |
| time->year = (value + RTC_MIN_YEAR_OFFSET) % 100; |
| |
| return 0; |
| } |
| |
| /* set rtc xosc setting */ |
| int rtc_xosc_write(u16 val) |
| { |
| u16 bbpu; |
| |
| rtc_write(RTC_OSC32CON, RTC_OSC32CON_UNLOCK1); |
| if (!rtc_busy_wait()) |
| return 0; |
| rtc_write(RTC_OSC32CON, RTC_OSC32CON_UNLOCK2); |
| if (!rtc_busy_wait()) |
| return 0; |
| |
| rtc_write(RTC_OSC32CON, val); |
| if (!rtc_busy_wait()) |
| return 0; |
| |
| rtc_read(RTC_BBPU, &bbpu); |
| bbpu |= RTC_BBPU_KEY | RTC_BBPU_RELOAD; |
| rtc_write(RTC_BBPU, bbpu); |
| |
| return rtc_write_trigger(); |
| } |
| |
| /* initialize rtc related registers */ |
| int rtc_reg_init(void) |
| { |
| u16 irqsta; |
| |
| rtc_write(RTC_IRQ_EN, 0); |
| rtc_write(RTC_CII_EN, 0); |
| rtc_write(RTC_AL_MASK, 0); |
| rtc_write(RTC_AL_YEA, 1970 - RTC_MIN_YEAR); |
| rtc_write(RTC_AL_MTH, 1); |
| rtc_write(RTC_AL_DOM, 1); |
| rtc_write(RTC_AL_DOW, 4); |
| rtc_write(RTC_AL_HOU, 0); |
| rtc_write(RTC_AL_MIN, 0); |
| rtc_write(RTC_AL_SEC, 0); |
| |
| rtc_write(RTC_DIFF, 0); |
| rtc_write(RTC_CALI, 0); |
| if (!rtc_write_trigger()) |
| return 0; |
| |
| rtc_read(RTC_IRQ_STA, &irqsta); /* read clear */ |
| |
| /* init time counters after resetting RTC_DIFF and RTC_CALI */ |
| rtc_write(RTC_TC_YEA, RTC_DEFAULT_YEA - RTC_MIN_YEAR); |
| rtc_write(RTC_TC_MTH, RTC_DEFAULT_MTH); |
| rtc_write(RTC_TC_DOM, RTC_DEFAULT_DOM); |
| rtc_write(RTC_TC_DOW, RTC_DEFAULT_DOW); |
| rtc_write(RTC_TC_HOU, 0); |
| rtc_write(RTC_TC_MIN, 0); |
| rtc_write(RTC_TC_SEC, 0); |
| |
| return rtc_write_trigger(); |
| } |
| |
| static u8 rtc_check_state(void) |
| { |
| u16 con; |
| u16 pwrky1; |
| u16 pwrky2; |
| |
| rtc_read(RTC_CON, &con); |
| rtc_read(RTC_POWERKEY1, &pwrky1); |
| rtc_read(RTC_POWERKEY2, &pwrky2); |
| |
| rtc_info("con=%x, pwrkey1=%x, pwrkey2=%x\n", con, pwrky1, pwrky2); |
| |
| if (con & RTC_CON_LPSTA_RAW) |
| return RTC_STATE_INIT; |
| |
| if (!rtc_busy_wait()) |
| return RTC_STATE_RECOVER; |
| |
| if (!rtc_writeif_unlock()) |
| return RTC_STATE_RECOVER; |
| |
| if (pwrky1 != RTC_POWERKEY1_KEY || pwrky2 != RTC_POWERKEY2_KEY) |
| return RTC_STATE_INIT; |
| else |
| return RTC_STATE_REBOOT; |
| } |
| |
| void rtc_boot_common(void) |
| { |
| u16 bbpu; |
| u16 con; |
| u16 irqsta; |
| |
| switch (rtc_check_state()) { |
| case RTC_STATE_REBOOT: |
| pwrap_write_field(RTC_BBPU, RTC_BBPU_KEY | RTC_BBPU_RELOAD, |
| 0xFFFF, 0); |
| rtc_write_trigger(); |
| rtc_osc_init(); |
| break; |
| case RTC_STATE_RECOVER: |
| rtc_init(1); |
| break; |
| case RTC_STATE_INIT: |
| default: |
| if (rtc_init(0)) |
| rtc_init(1); |
| break; |
| } |
| |
| rtc_read(RTC_IRQ_STA, &irqsta); /* Read clear */ |
| rtc_read(RTC_BBPU, &bbpu); |
| rtc_read(RTC_CON, &con); |
| |
| rtc_info("irqsta=%x, bbpu=%x, con=%x\n", irqsta, bbpu, con); |
| } |