soc/mediatek/mt8186: Add support for regulator VPROC12/VSRAM_PROC12

To raise little CPU frequency, add support for VPROC12 and VSRAM_PROC12 of MT6366.

TEST=build pass
BUG=b:202871018

Signed-off-by: James Lo <james.lo@mediatek.corp-partner.google.com>
Change-Id: I718fdf36d34969a6e21ddc8c1ec6f525e0e20904
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59566
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/soc/mediatek/mt8186/include/soc/mt6366.h

@@ -28,6 +28,9 @@ enum {
 	PMIC_TOP_TMA_KEY		= 0x03a8,
 	PMIC_PWRHOLD			= 0x0a08,
 	PMIC_CPSDSA4			= 0x0a2e,
+	PMIC_VPROC12_OP_EN		= 0x1410,
+	PMIC_VPROC12_DBG0		= 0x141e,
+	PMIC_VPROC12_VOSEL		= 0x1426,
 	PMIC_VCORE_OP_EN		= 0x1490,
 	PMIC_VCORE_DBG0			= 0x149e,
 	PMIC_VCORE_VOSEL		= 0x14aa,
@@ -37,6 +40,9 @@ enum {
 	PMIC_VDRAM1_VOSEL		= 0x1626,
 	PMIC_SMPS_ANA_CON0		= 0x1808,
 	PMIC_VDDQ_OP_EN			= 0x1b16,
+	PMIC_VSRAM_PROC12_OP_EN		= 0x1b90,
+	PMIC_VSRAM_PROC12_DBG0		= 0x1ba2,
+	PMIC_VSRAM_PROC12_VOSEL		= 0x1bf0,
 	PMIC_LDO_VMC_CON0		= 0x1cc4,
 	PMIC_LDO_VMC_OP_EN		= 0x1cc6,
 	PMIC_LDO_VMCH_CON0		= 0x1cd8,
@@ -53,6 +59,8 @@ enum mt6366_regulator_id {
 	MT6366_VDDQ,
 	MT6366_VMCH,
 	MT6366_VMC,
+	MT6366_VPROC12,
+	MT6366_VSRAM_PROC12,
 	MT6366_REGULATOR_NUM,
 };
 

src/soc/mediatek/mt8186/mt6366.c

@@ -493,6 +493,50 @@ static void pmic_set_vcore_vol(u32 vcore_uv)
 	udelay(1);
 }
 
+static u32 pmic_get_vproc12_vol(void)
+{
+	u16 vol_reg;
+
+	vol_reg = pwrap_read_field(PMIC_VPROC12_DBG0, 0x7F, 0);
+	return 500000 + vol_reg * 6250;
+}
+
+static void pmic_set_vproc12_vol(u32 v_uv)
+{
+	u16 vol_reg;
+
+	assert(v_uv >= 500000);
+	assert(v_uv <= 1293750);
+
+	vol_reg = (v_uv - 500000) / 6250;
+
+	pwrap_write_field(PMIC_VPROC12_OP_EN, 1, 0x7F, 0);
+	pwrap_write_field(PMIC_VPROC12_VOSEL, vol_reg, 0x7F, 0);
+	udelay(1);
+}
+
+static u32 pmic_get_vsram_proc12_vol(void)
+{
+	u16 vol_reg;
+
+	vol_reg = pwrap_read_field(PMIC_VSRAM_PROC12_DBG0, 0x7F, 0);
+	return 500000 + vol_reg * 6250;
+}
+
+static void pmic_set_vsram_proc12_vol(u32 v_uv)
+{
+	u16 vol_reg;
+
+	assert(v_uv >= 500000);
+	assert(v_uv <= 1293750);
+
+	vol_reg = (v_uv - 500000) / 6250;
+
+	pwrap_write_field(PMIC_VSRAM_PROC12_OP_EN, 1, 0x7F, 0);
+	pwrap_write_field(PMIC_VSRAM_PROC12_VOSEL, vol_reg, 0x7F, 0);
+	udelay(1);
+}
+
 static u32 pmic_get_vdram1_vol(void)
 {
 	u32 vol_reg;
@@ -779,6 +823,12 @@ void mt6366_set_voltage(enum mt6366_regulator_id id, u32 voltage_uv)
 	case MT6366_VMC:
 		pmic_set_vmc_vol(voltage_uv);
 		break;
+	case MT6366_VPROC12:
+		pmic_set_vproc12_vol(voltage_uv);
+		break;
+	case MT6366_VSRAM_PROC12:
+		pmic_set_vsram_proc12_vol(voltage_uv);
+		break;
 	default:
 		printk(BIOS_ERR, "%s: PMIC %d is not supported\n", __func__, id);
 		break;
@@ -798,6 +848,10 @@ u32 mt6366_get_voltage(enum mt6366_regulator_id id)
 		return pmic_get_vmch_vol();
 	case MT6366_VMC:
 		return pmic_get_vmc_vol();
+	case MT6366_VPROC12:
+		return pmic_get_vproc12_vol();
+	case MT6366_VSRAM_PROC12:
+		return pmic_get_vsram_proc12_vol();
 	default:
 		printk(BIOS_ERR, "%s: PMIC %d is not supported\n", __func__, id);
 		break;