mb/google/asurada: Implement board-specific regulator controls

Currently, five regulator controls are implemented for DRAM
calibration and DVFS feature.

The regulators for VCORE and VM18 are controlled by MT6359.
The reguatlors for VDD1, VDD2 and VMDDR are controlled by MT6360
via EC.

BUG=b:147789962
BRANCH=none
TEST=verified with DRAM driver

Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Change-Id: Id06a8196ca4badc51b06759afb07b5664278d13b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46406
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/mainboard/google/asurada/Makefile.inc

@@ -11,6 +11,7 @@ verstage-y += reset.c
 romstage-y += memlayout.ld
 romstage-y += boardid.c
 romstage-y += chromeos.c
+romstage-y += regulator.c
 romstage-y += romstage.c
 romstage-y += sdram_configs.c
 

src/mainboard/google/asurada/regulator.c

@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <ec/google/chromeec/ec.h>
+#include <soc/mt6359p.h>
+#include <soc/mt6360.h>
+#include <soc/regulator.h>
+
+static int get_mt6360_regulator_id(enum mtk_regulator regulator)
+{
+	switch (regulator) {
+	case MTK_REGULATOR_VDD2:
+		return MT6360_BUCK1;
+	case MTK_REGULATOR_VDDQ:
+		return MT6360_LDO7;
+	case MTK_REGULATOR_VMDDR:
+		return MT6360_LDO6;
+	default:
+		break;
+	}
+
+	return -1;
+}
+
+static int get_mt6359p_regulator_id(enum mtk_regulator regulator)
+{
+	switch (regulator) {
+	case MTK_REGULATOR_VCORE:
+		return MT6359P_GPU11;
+	default:
+		break;
+	}
+
+	return -1;
+}
+
+void mainboard_set_regulator_vol(enum mtk_regulator regulator,
+				 uint32_t voltage_uv)
+{
+	/*
+	 * Handle the regulator that does not have a regulator ID
+	 * in its underlying implementation.
+	 */
+	if (regulator == MTK_REGULATOR_VDD1) {
+		mt6359p_set_vm18_voltage(voltage_uv);
+		return;
+	}
+
+	int id;
+
+	id = get_mt6360_regulator_id(regulator);
+	if (id >= 0) {
+		uint32_t voltage_mv = voltage_uv / 1000;
+		google_chromeec_regulator_set_voltage(id, voltage_mv, voltage_mv);
+		return;
+	}
+
+	id = get_mt6359p_regulator_id(regulator);
+	if (id >= 0) {
+		mt6359p_buck_set_voltage(id, voltage_uv);
+		return;
+	}
+
+	printk(BIOS_WARNING, "Invalid regulator ID: %d\n", regulator);
+}
+
+uint32_t mainboard_get_regulator_vol(enum mtk_regulator regulator)
+{
+	/*
+	 * Handle the regulator that does not have a regulator ID
+	 * in its underlying implementation.
+	 */
+	if (regulator == MTK_REGULATOR_VDD1)
+		return mt6359p_get_vm18_voltage();
+
+	int id;
+
+	id = get_mt6360_regulator_id(regulator);
+	if (id >= 0) {
+		uint32_t voltage_mv = 0;
+		google_chromeec_regulator_get_voltage(id, &voltage_mv);
+		return voltage_mv * 1000;
+	}
+
+	id = get_mt6359p_regulator_id(regulator);
+	if (id >= 0)
+		return mt6359p_buck_get_voltage(id);
+
+	printk(BIOS_WARNING, "Invalid regulator ID: %d\n", regulator);
+
+	return 0;
+}

src/soc/mediatek/common/include/soc/regulator.h

@@ -10,6 +10,7 @@ enum mtk_regulator {
 	MTK_REGULATOR_VDD2,
 	MTK_REGULATOR_VDDQ,
 	MTK_REGULATOR_VMDDR,
+	MTK_REGULATOR_VCORE,
 };
 
 void mainboard_set_regulator_vol(enum mtk_regulator regulator,

src/soc/mediatek/mt8192/include/soc/mt6360.h

@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __SOC_MEDIATEK_MT6360_H__
+#define __SOC_MEDIATEK_MT6360_H__
+
+enum mt6360_regulator_id {
+	MT6360_LDO3 = 0,
+	MT6360_LDO5,
+	MT6360_LDO6,
+	MT6360_LDO7,
+	MT6360_BUCK1,
+	MT6360_BUCK2,
+	MT6360_REGULATOR_COUNT,
+};
+
+#endif /* __SOC_MEDIATEK_MT6360_H__ */