mb/google/cherry: Implement regulator interface

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: Iab58edd019ccf9130e96fae55f147ab20cd0f45b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55751
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/cherry/Makefile.inc

@@ -9,6 +9,7 @@ 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
 
@@ -16,4 +17,5 @@ ramstage-y += memlayout.ld
 ramstage-y += boardid.c
 ramstage-y += chromeos.c
 ramstage-y += mainboard.c
+ramstage-y += regulator.c
 ramstage-y += reset.c

src/mainboard/google/cherry/regulator.c

@@ -0,0 +1,141 @@
+/* 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/mt6691.h>
+#include <soc/regulator.h>
+
+#define MT6691_I2C_NUM	7
+
+static int get_mt6360_regulator_id(enum mtk_regulator regulator)
+{
+	switch (regulator) {
+	case MTK_REGULATOR_VDD2:
+		return MT6360_PMIC_BUCK1;
+	case MTK_REGULATOR_VDDQ:
+		return MT6360_PMIC_BUCK2;
+	default:
+		break;
+	}
+
+	return -1;
+}
+
+static int get_mt6359p_regulator_id(enum mtk_regulator regulator)
+{
+	return regulator == MTK_REGULATOR_VCORE ? MT6359P_GPU11 : -1;
+}
+
+static int get_mt6691_regulator_id(enum mtk_regulator regulator)
+{
+	return regulator == MTK_REGULATOR_VMDDR ? MT6691_I2C_NUM : -1;
+}
+
+static int check_regulator_control(enum mtk_regulator regulator)
+{
+	/*
+	 * MT6880 is not controlled by SW.
+	 * No need to control it.
+	 */
+	if (regulator == MTK_REGULATOR_VDD1) {
+		printk(BIOS_WARNING,
+		       "[%d] MT6880 is not controlled by SW.\n", regulator);
+		return -1;
+	}
+	return 0;
+}
+
+void mainboard_set_regulator_vol(enum mtk_regulator regulator,
+				 uint32_t voltage_uv)
+{
+	if (check_regulator_control(regulator) < 0)
+		return;
+
+	int id;
+
+	id = get_mt6360_regulator_id(regulator);
+	if (id >= 0) {
+		mt6360_pmic_set_voltage(id, voltage_uv);
+		return;
+	}
+
+	id = get_mt6359p_regulator_id(regulator);
+	if (id >= 0) {
+		mt6359p_buck_set_voltage(id, voltage_uv);
+		return;
+	}
+
+	id = get_mt6691_regulator_id(regulator);
+	if (id >= 0) {
+		mt6691_set_voltage(id, voltage_uv);
+		return;
+	}
+
+	printk(BIOS_ERR, "Invalid regulator ID: %d\n", regulator);
+}
+
+uint32_t mainboard_get_regulator_vol(enum mtk_regulator regulator)
+{
+	if (check_regulator_control(regulator) < 0)
+		return 0;
+
+	int id;
+
+	id = get_mt6360_regulator_id(regulator);
+	if (id >= 0)
+		return mt6360_pmic_get_voltage(id);
+
+	id = get_mt6359p_regulator_id(regulator);
+	if (id >= 0)
+		return mt6359p_buck_get_voltage(id);
+
+	id = get_mt6691_regulator_id(regulator);
+	if (id >= 0)
+		return mt6691_get_voltage(id);
+
+	printk(BIOS_ERR, "Invalid regulator ID: %d\n", regulator);
+
+	return 0;
+}
+
+int mainboard_enable_regulator(enum mtk_regulator regulator, uint8_t enable)
+{
+	if (check_regulator_control(regulator) < 0)
+		return 0;
+
+	/* Return 0 if the regulator is already enabled or disabled. */
+	if (mainboard_regulator_is_enabled(regulator) == enable)
+		return 0;
+
+	int id;
+
+	id = get_mt6360_regulator_id(regulator);
+	if (id >= 0) {
+		mt6360_pmic_enable(id, enable);
+		return 0;
+	}
+
+	printk(BIOS_ERR, "Invalid regulator ID: %d\n", regulator);
+
+	return -1;
+}
+
+uint8_t mainboard_regulator_is_enabled(enum mtk_regulator regulator)
+{
+	if (check_regulator_control(regulator) < 0)
+		return 0;
+
+	int id;
+
+	id = get_mt6360_regulator_id(regulator);
+	if (id >= 0)
+		return mt6360_pmic_is_enabled(id);
+
+	printk(BIOS_ERR,
+	       "Failed to query regulator ID: %d\n; assuming disabled",
+	       regulator);
+
+	return 0;
+}