| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2015 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/mt6391.h> |
| #include <soc/pmic_wrap.h> |
| |
| #define RTC_GPIO_USER_MASK ((1 << 13) - (1 << 8)) |
| |
| |
| /* initialize rtc related gpio */ |
| static int rtc_gpio_init(void) |
| { |
| u16 con; |
| |
| mt6391_gpio_set_pull(3, MT6391_GPIO_PULL_DISABLE, |
| MT6391_GPIO_PULL_DOWN); /* RTC_32K1V8 */ |
| |
| /* Export 32K clock RTC_32K2V8 */ |
| rtc_read(RTC_CON, &con); |
| con &= (RTC_CON_LPSTA_RAW | RTC_CON_LPRST | RTC_CON_LPEN); |
| con |= (RTC_CON_GPEN | RTC_CON_GOE); |
| con &= ~(RTC_CON_F32KOB); |
| rtc_write(RTC_CON, con); |
| return rtc_write_trigger(); |
| } |
| |
| /* set xosc mode */ |
| void rtc_osc_init(void) |
| { |
| u16 con; |
| |
| /* enable 32K export */ |
| rtc_gpio_init(); |
| |
| rtc_write(PMIC_RG_TOP_CKTST2, 0x0); |
| rtc_read(RTC_OSC32CON, &con); |
| if ((con & 0x1f) != 0x0) /* check XOSCCALI */ |
| rtc_xosc_write(0x3); |
| } |
| |
| /* low power detect setting */ |
| static int rtc_lpd_init(void) |
| { |
| pwrap_write_field(RTC_CON, RTC_CON_LPEN, RTC_CON_LPRST, 0); |
| if (!rtc_write_trigger()) |
| return 0; |
| |
| pwrap_write_field(RTC_CON, RTC_CON_LPRST, 0, 0); |
| if (!rtc_write_trigger()) |
| return 0; |
| |
| pwrap_write_field(RTC_CON, 0, RTC_CON_LPRST, 0); |
| if (!rtc_write_trigger()) |
| return 0; |
| |
| return 1; |
| } |
| |
| /* rtc init check */ |
| int rtc_init(u8 recover) |
| { |
| int ret; |
| |
| rtc_info("recovery: %d\n", recover); |
| |
| if (!rtc_writeif_unlock()) { |
| ret = -RTC_STATUS_WRITEIF_UNLOCK_FAIL; |
| goto err; |
| } |
| |
| if (!rtc_gpio_init()) { |
| ret = -RTC_STATUS_GPIO_INIT_FAIL; |
| goto err; |
| } |
| |
| /* Use SW to detect 32K mode instead of HW */ |
| if (recover) |
| pwrap_write_field(PMIC_RG_CHRSTATUS, 0x4, 0x1, 9); |
| |
| if (!rtc_xosc_write(0x3)) { |
| ret = -RTC_STATUS_OSC_SETTING_FAIL; |
| goto err; |
| } |
| |
| if (recover) |
| mdelay(1000); |
| |
| /* write powerkeys */ |
| rtc_write(RTC_POWERKEY1, RTC_POWERKEY1_KEY); |
| rtc_write(RTC_POWERKEY2, RTC_POWERKEY2_KEY); |
| if (!rtc_write_trigger()) { |
| ret = -RTC_STATUS_POWERKEY_INIT_FAIL; |
| goto err; |
| } |
| |
| if (recover) |
| pwrap_write_field(PMIC_RG_CHRSTATUS, 0, 0x4, 9); |
| |
| if (!rtc_xosc_write(0)) { |
| ret = -RTC_STATUS_OSC_SETTING_FAIL; |
| goto err; |
| } |
| |
| if (!rtc_reg_init()) { |
| ret = -RTC_STATUS_REG_INIT_FAIL; |
| goto err; |
| } |
| |
| if (!rtc_lpd_init()) { |
| ret = -RTC_STATUS_LPD_INIT_FAIL; |
| goto err; |
| } |
| |
| return RTC_STATUS_OK; |
| err: |
| rtc_info("init fail: ret=%d\n", ret); |
| return ret; |
| } |
| |
| /* enable rtc bbpu */ |
| static void rtc_bbpu_power_on(void) |
| { |
| u16 bbpu; |
| int ret; |
| |
| /* pull PWRBB high */ |
| bbpu = RTC_BBPU_KEY | RTC_BBPU_AUTO | RTC_BBPU_BBPU | RTC_BBPU_PWREN; |
| rtc_write(RTC_BBPU, bbpu); |
| ret = rtc_write_trigger(); |
| rtc_info("rtc_write_trigger=%d\n", ret); |
| |
| /* enable DCXO to transform external 32KHz clock to 26MHz clock |
| directly sent to SoC */ |
| pwrap_write_field(PMIC_RG_DCXO_FORCE_MODE1, BIT(11), 0, 0); |
| pwrap_write_field(PMIC_RG_DCXO_POR2_CON3, |
| BIT(8) | BIT(9) | BIT(10) | BIT(11), 0, 0); |
| pwrap_write_field(PMIC_RG_DCXO_CON2, |
| BIT(1) | BIT(3) | BIT(5) | BIT(6), 0, 0); |
| |
| rtc_read(RTC_BBPU, &bbpu); |
| rtc_info("done BBPU=%#x\n", bbpu); |
| |
| /* detect hw clock done,close RG_RTC_75K_PDN for low power setting. */ |
| pwrap_write_field(PMIC_RG_TOP_CKPDN2, 0x1, 0, 14); |
| } |
| |
| /* the rtc boot flow entry */ |
| void rtc_boot(void) |
| { |
| rtc_write(PMIC_RG_TOP_CKPDN, 0); |
| rtc_write(PMIC_RG_TOP_CKPDN2, 0); |
| |
| rtc_boot_common(); |
| rtc_bbpu_power_on(); |
| } |