/* SPDX-License-Identifier: GPL-2.0-only */ #include <soc/rtc_common.h> #include <soc/rtc.h> #include <timer.h> /* ensure rtc write success */ static bool 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 false; } } while (bbpu & RTC_BBPU_CBUSY); return true; } bool rtc_write_trigger(void) { rtc_write(RTC_WRTGR, 1); return rtc_busy_wait(); } /* unlock rtc write interface */ bool rtc_writeif_unlock(void) { rtc_write(RTC_PROT, RTC_PROT_UNLOCK1); if (!rtc_write_trigger()) return false; rtc_write(RTC_PROT, RTC_PROT_UNLOCK2); if (!rtc_write_trigger()) return false; return true; } /* 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 */ bool rtc_xosc_write(u16 val) { u16 bbpu; rtc_write(RTC_OSC32CON, RTC_OSC32CON_UNLOCK1); if (!rtc_busy_wait()) return false; rtc_write(RTC_OSC32CON, RTC_OSC32CON_UNLOCK2); if (!rtc_busy_wait()) return false; rtc_write(RTC_OSC32CON, val); if (!rtc_busy_wait()) return false; rtc_read(RTC_BBPU, &bbpu); bbpu |= RTC_BBPU_KEY | RTC_BBPU_RELOAD; rtc_write(RTC_BBPU, bbpu); return rtc_write_trigger(); } /* enable lpd subroutine */ bool rtc_lpen(u16 con) { con &= ~RTC_CON_LPRST; rtc_write(RTC_CON, con); if (!rtc_write_trigger()) return false; con |= RTC_CON_LPRST; rtc_write(RTC_CON, con); if (!rtc_write_trigger()) return false; con &= ~RTC_CON_LPRST; rtc_write(RTC_CON, con); if (!rtc_write_trigger()) return false; return true; } /* initialize rtc related registers */ bool 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 false; 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(); } /* write powerkeys to enable rtc functions */ bool rtc_powerkey_init(void) { rtc_write(RTC_POWERKEY1, RTC_POWERKEY1_KEY); rtc_write(RTC_POWERKEY2, RTC_POWERKEY2_KEY); 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: rtc_read(RTC_BBPU, &bbpu); rtc_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_RELOAD); rtc_write_trigger(); rtc_osc_init(); rtc_info("RTC_STATE_REBOOT\n"); break; case RTC_STATE_RECOVER: rtc_init(1); rtc_info("RTC_STATE_RECOVER\n"); break; case RTC_STATE_INIT: default: if (rtc_init(0)) rtc_init(1); rtc_info("RTC_STATE_INIT\n"); 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); }