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/*
* 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 <delay.h>
#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();
}
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