diff options
Diffstat (limited to 'src/soc/mediatek/mt8183/rtc.c')
| -rw-r--r-- | src/soc/mediatek/mt8183/rtc.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/src/soc/mediatek/mt8183/rtc.c b/src/soc/mediatek/mt8183/rtc.c new file mode 100644 index 0000000000..64eedfb552 --- /dev/null +++ b/src/soc/mediatek/mt8183/rtc.c @@ -0,0 +1,250 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2018 MediaTek Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <soc/rtc_common.h> +#include <soc/rtc.h> +#include <soc/mt6358.h> +#include <soc/pmic_wrap.h> + +#define RTC_GPIO_USER_MASK ((1 << 13) - (1 << 8)) + +/* initialize rtc setting of using dcxo clock */ +static void rtc_enable_dcxo(void) +{ + u16 bbpu, con, osc32con, sec; + + pwrap_read(RTC_BBPU, &bbpu); + pwrap_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_RELOAD); + rtc_write_trigger(); + + mdelay(1); + if (!rtc_writeif_unlock()) /* Unlock for reload */ + printk(BIOS_INFO, + "[RTC] %s rtc_writeif_unlock() fail\n", __func__); + + pwrap_read(RTC_OSC32CON, &osc32con); + rtc_xosc_write((osc32con & ~RTC_EMBCK_SRC_SEL) + | RTC_XOSC32_ENB | RTC_REG_XOSC32_ENB); + pwrap_read(RTC_BBPU, &bbpu); + pwrap_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_RELOAD); + rtc_write_trigger(); + + pwrap_read(RTC_CON, &con); + pwrap_read(RTC_OSC32CON, &osc32con); + pwrap_read(RTC_AL_SEC, &sec); + printk(BIOS_INFO, "[RTC] %s con = 0x%x, osc32con = 0x%x, sec = 0x%x\n", + __func__, con, osc32con, sec); +} + +/* initialize rtc related gpio */ +static int rtc_gpio_init(void) +{ + u16 con; + + /* RTC_32K1V8 clock change from 128k div 4 source + * to RTC 32k source + */ + pwrap_write_field(PMIC_RG_TOP_CKSEL_CON0_SET, 0x1, 0x1, 3); + + /* Export 32K clock RTC_32K1V8_1 */ + pwrap_write_field(PMIC_RG_TOP_CKPDN_CON1_CLR, 0x1, 0x1, 1); + + /* Export 32K clock RTC_32K2V8 */ + pwrap_read(RTC_CON, &con); + con &= (RTC_CON_LPSTA_RAW | RTC_CON_LPRST | RTC_CON_EOSC32_LPEN); + con |= (RTC_CON_GPEN | RTC_CON_GOE); + con &= ~(RTC_CON_F32KOB); + pwrap_write(RTC_CON, con); + return rtc_write_trigger(); +} + +/* set xosc mode */ +void rtc_osc_init(void) +{ + /* enable 32K export */ + rtc_gpio_init(); +} + +/* low power detect setting */ +static int rtc_lpd_init(void) +{ + u16 con; + + con = pwrap_read(RTC_CON, &con) | RTC_CON_XOSC32_LPEN; + con &= ~RTC_CON_LPRST; + pwrap_write(RTC_CON, con); + if (!rtc_write_trigger()) + return 0; + + con |= RTC_CON_LPRST; + pwrap_write(RTC_CON, con); + if (!rtc_write_trigger()) + return 0; + + con &= ~RTC_CON_LPRST; + pwrap_write(RTC_CON, con); + if (!rtc_write_trigger()) + return 0; + + con = pwrap_read(RTC_CON, &con) | RTC_CON_EOSC32_LPEN; + con &= ~RTC_CON_LPRST; + pwrap_write(RTC_CON, con); + if (!rtc_write_trigger()) + return 0; + + con |= RTC_CON_LPRST; + pwrap_write(RTC_CON, con); + if (!rtc_write_trigger()) + return 0; + + con &= ~RTC_CON_LPRST; + pwrap_write(RTC_CON, con); + if (!rtc_write_trigger()) + return 0; + + return 1; +} + +static bool rtc_hw_init(void) +{ + u16 bbpu; + + pwrap_read(RTC_BBPU, &bbpu); + pwrap_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_INIT); + rtc_write_trigger(); + + udelay(500); + + pwrap_read(RTC_BBPU, &bbpu); + pwrap_write(RTC_BBPU, bbpu | RTC_BBPU_KEY | RTC_BBPU_RELOAD); + rtc_write_trigger(); + + pwrap_read(RTC_BBPU, &bbpu); + if (bbpu & RTC_BBPU_INIT) { + printk(BIOS_INFO, "[RTC] %s:%d timeout\n", __func__, __LINE__); + return false; + } + + return true; +} + +/* rtc init check */ +int rtc_init(u8 recover) +{ + printk(BIOS_INFO, "[RTC] %s recovery: %d\n", __func__, recover); + + if (!rtc_writeif_unlock()) + return 0; + + if (!rtc_gpio_init()) + return 0; + + /* using dcxo 32K clock */ + rtc_enable_dcxo(); + + if (recover) + mdelay(20); + + /* write powerkeys */ + pwrap_write(RTC_POWERKEY1, RTC_POWERKEY1_KEY); + pwrap_write(RTC_POWERKEY2, RTC_POWERKEY2_KEY); + if (!rtc_write_trigger()) + return 0; + + if (!rtc_reg_init()) + return 0; + if (!rtc_lpd_init()) + return 0; + if (!rtc_hw_init()) + return 0; + + return 1; +} + +/* enable rtc bbpu */ +void rtc_bbpu_power_on(void) +{ + u16 bbpu; + int ret; + + /* pull powerhold high, control by pmic */ + pmic_set_power_hold(true); + + /* pull PWRBB high */ + bbpu = RTC_BBPU_KEY | RTC_BBPU_AUTO | RTC_BBPU_RELOAD | RTC_BBPU_PWREN; + pwrap_write(RTC_BBPU, bbpu); + ret = rtc_write_trigger(); + printk(BIOS_INFO, "[RTC] %s rtc_write_trigger=%d\n", __func__, ret); + + pwrap_read(RTC_BBPU, &bbpu); + printk(BIOS_INFO, "[RTC] %s done BBPU=%#x\n", __func__, bbpu); +} + +void poweroff(void) +{ + u16 bbpu; + + if (!rtc_writeif_unlock()) + printk(BIOS_INFO, + "[RTC] %s rtc_writeif_unlock() fail\n", __func__); + /* pull PWRBB low */ + bbpu = RTC_BBPU_KEY | RTC_BBPU_RELOAD | RTC_BBPU_PWREN; + pwrap_write(RTC_BBPU, bbpu); + + pmic_set_power_hold(false); + halt(); +} + +static void dcxo_init(void) +{ + /* Buffer setting */ + pwrap_write(PMIC_RG_DCXO_CW15, 0xA2AA); + pwrap_write(PMIC_RG_DCXO_CW13, 0x98E9); + pwrap_write(PMIC_RG_DCXO_CW16, 0x9855); + + /* 26M enable control */ + /* Enable clock buffer XO_SOC, XO_CEL */ + pwrap_write(PMIC_RG_DCXO_CW00, 0x4805); + pwrap_write(PMIC_RG_DCXO_CW11, 0x8000); + + /* Load thermal coefficient */ + pwrap_write(PMIC_RG_TOP_TMA_KEY, 0x9CA7); + pwrap_write(PMIC_RG_DCXO_CW21, 0x12A7); + pwrap_write(PMIC_RG_DCXO_ELR0, 0xD004); + pwrap_write(PMIC_RG_TOP_TMA_KEY, 0x0000); + + /* Adjust OSC FPM setting */ + pwrap_write(PMIC_RG_DCXO_CW07, 0x8FFE); + + /* Re-Calibrate OSC current */ + pwrap_write(PMIC_RG_DCXO_CW09, 0x008F); + udelay(100); + pwrap_write(PMIC_RG_DCXO_CW09, 0x408F); + mdelay(5); +} + +/* the rtc boot flow entry */ +void rtc_boot(void) +{ + /* dcxo clock init settings */ + dcxo_init(); + + /* dcxo 32k init settings */ + pwrap_write_field(PMIC_RG_DCXO_CW02, 0xF, 0xF, 0); + pwrap_write_field(PMIC_RG_SCK_TOP_CON0, 0x1, 0x1, 0); + + rtc_boot_common(); + rtc_bbpu_power_on(); +} |