1 files changed, 133 insertions, 0 deletions
diff --git a/plat/mediatek/mt8186/drivers/rtc/rtc.c b/plat/mediatek/mt8186/drivers/rtc/rtc.c
new file mode 100644
index 0000000..4fcf58e
--- /dev/null
+++ b/plat/mediatek/mt8186/drivers/rtc/rtc.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2021, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include <rtc.h>
+
+static void RTC_Config_Interface(uint32_t addr, uint16_t data,
+			    uint16_t MASK, uint16_t SHIFT)
+{
+	uint16_t pmic_reg = 0;
+
+	pmic_reg = RTC_Read(addr);
+
+	pmic_reg &= ~(MASK << SHIFT);
+	pmic_reg |= (data << SHIFT);
+
+	RTC_Write(addr, pmic_reg);
+}
+
+static void rtc_disable_2sec_reboot(void)
+{
+	uint16_t reboot;
+
+	reboot = (RTC_Read(RTC_AL_SEC) & ~RTC_BBPU_2SEC_EN) &
+		 ~RTC_BBPU_AUTO_PDN_SEL;
+	RTC_Write(RTC_AL_SEC, reboot);
+	RTC_Write_Trigger();
+}
+
+static void rtc_xosc_write(uint16_t val, bool reload)
+{
+	uint16_t bbpu;
+
+	RTC_Write(RTC_OSC32CON, RTC_OSC32CON_UNLOCK1);
+	rtc_busy_wait();
+	RTC_Write(RTC_OSC32CON, RTC_OSC32CON_UNLOCK2);
+	rtc_busy_wait();
+
+	RTC_Write(RTC_OSC32CON, val);
+	rtc_busy_wait();
+
+	if (reload) {
+		bbpu = RTC_Read(RTC_BBPU) | RTC_BBPU_KEY | RTC_BBPU_RELOAD;
+		RTC_Write(RTC_BBPU, bbpu);
+		RTC_Write_Trigger();
+	}
+}
+
+static void rtc_enable_k_eosc(void)
+{
+	uint16_t osc32;
+	uint16_t rtc_eosc_cali_td = 8; /* eosc cali period time */
+
+	/* Truning on eosc cali mode clock */
+	RTC_Config_Interface(PMIC_RG_TOP_CON, 1,
+			PMIC_RG_SRCLKEN_IN0_HW_MODE_MASK,
+			PMIC_RG_SRCLKEN_IN0_HW_MODE_SHIFT);
+	RTC_Config_Interface(PMIC_RG_TOP_CON, 1,
+			PMIC_RG_SRCLKEN_IN1_HW_MODE_MASK,
+			PMIC_RG_SRCLKEN_IN1_HW_MODE_SHIFT);
+	RTC_Config_Interface(PMIC_RG_SCK_TOP_CKPDN_CON0, 0,
+			PMIC_RG_RTC_EOSC32_CK_PDN_MASK,
+			PMIC_RG_RTC_EOSC32_CK_PDN_SHIFT);
+
+	switch (rtc_eosc_cali_td) {
+	case 1:
+		RTC_Config_Interface(PMIC_RG_EOSC_CALI_CON0, 0x3,
+			PMIC_RG_EOSC_CALI_TD_MASK, PMIC_RG_EOSC_CALI_TD_SHIFT);
+		break;
+	case 2:
+		RTC_Config_Interface(PMIC_RG_EOSC_CALI_CON0, 0x4,
+			PMIC_RG_EOSC_CALI_TD_MASK, PMIC_RG_EOSC_CALI_TD_SHIFT);
+		break;
+	case 4:
+		RTC_Config_Interface(PMIC_RG_EOSC_CALI_CON0, 0x5,
+			PMIC_RG_EOSC_CALI_TD_MASK, PMIC_RG_EOSC_CALI_TD_SHIFT);
+		break;
+	case 16:
+		RTC_Config_Interface(PMIC_RG_EOSC_CALI_CON0, 0x7,
+			PMIC_RG_EOSC_CALI_TD_MASK, PMIC_RG_EOSC_CALI_TD_SHIFT);
+		break;
+	default:
+		RTC_Config_Interface(PMIC_RG_EOSC_CALI_CON0, 0x6,
+			PMIC_RG_EOSC_CALI_TD_MASK, PMIC_RG_EOSC_CALI_TD_SHIFT);
+		break;
+	}
+	/* Switch the DCXO from 32k-less mode to RTC mode,
+	 * otherwise, EOSC cali will fail
+	 */
+	/* RTC mode will have only OFF mode and FPM */
+	RTC_Config_Interface(PMIC_RG_DCXO_CW02, 0, PMIC_RG_XO_EN32K_MAN_MASK,
+		PMIC_RG_XO_EN32K_MAN_SHIFT);
+	RTC_Write(RTC_BBPU,
+		  RTC_Read(RTC_BBPU) | RTC_BBPU_KEY | RTC_BBPU_RELOAD);
+	RTC_Write_Trigger();
+	/* Enable K EOSC mode for normal power off and then plug out battery */
+	RTC_Write(RTC_AL_YEA, ((RTC_Read(RTC_AL_YEA) | RTC_K_EOSC_RSV_0)
+				& (~RTC_K_EOSC_RSV_1)) | RTC_K_EOSC_RSV_2);
+	RTC_Write_Trigger();
+
+	osc32 = RTC_Read(RTC_OSC32CON);
+	rtc_xosc_write(osc32 | RTC_EMBCK_SRC_SEL, true);
+	INFO("[RTC] RTC_enable_k_eosc\n");
+}
+
+void rtc_power_off_sequence(void)
+{
+	uint16_t bbpu;
+
+	rtc_disable_2sec_reboot();
+	rtc_enable_k_eosc();
+
+	/* clear alarm */
+	bbpu = RTC_BBPU_KEY | RTC_BBPU_CLR | RTC_BBPU_PWREN;
+	if (Writeif_unlock()) {
+		RTC_Write(RTC_BBPU, bbpu);
+
+		RTC_Write(RTC_AL_MASK, RTC_AL_MASK_DOW);
+		RTC_Write_Trigger();
+		mdelay(1);
+
+		bbpu = RTC_Read(RTC_BBPU) | RTC_BBPU_KEY | RTC_BBPU_RELOAD;
+		RTC_Write(RTC_BBPU, bbpu);
+		RTC_Write_Trigger();
+		INFO("[RTC] BBPU=0x%x, IRQ_EN=0x%x, AL_MSK=0x%x, AL_SEC=0x%x\n",
+		     RTC_Read(RTC_BBPU), RTC_Read(RTC_IRQ_EN),
+		     RTC_Read(RTC_AL_MASK), RTC_Read(RTC_AL_SEC));
+	}
+}