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path: root/plat/mediatek/mt8183/drivers/rtc/rtc.c
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Diffstat (limited to 'plat/mediatek/mt8183/drivers/rtc/rtc.c')
-rw-r--r--plat/mediatek/mt8183/drivers/rtc/rtc.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/plat/mediatek/mt8183/drivers/rtc/rtc.c b/plat/mediatek/mt8183/drivers/rtc/rtc.c
new file mode 100644
index 000000000..a821c1bc8
--- /dev/null
+++ b/plat/mediatek/mt8183/drivers/rtc/rtc.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2019, 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));
+ }
+}