power: regulator: Add support for NPCM8xx

Add support for setting nuvoton BMC NPCM845 voltage supply.

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>

diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index c519e066ef028503d2c10822148308a5a27b25e6..c02e6377d828a66059261af5e025e1e748fdc757 100644 (file)
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -128,6 +128,14 @@ config DM_REGULATOR_MAX77686
        features for REGULATOR MAX77686. The driver implements get/set api for:
        value, enable and mode.
 
+config DM_REGULATOR_NPCM8XX
+       bool "Enable Driver Model for NPCM8xx voltage supply"
+       depends on DM_REGULATOR && ARCH_NPCM8XX
+       help
+         Enable support for configuring voltage supply on NPCM8XX SoC. The
+         voltage supplies support two voltage levels and the driver implements
+         get/set api for setting the value.
+
 config DM_REGULATOR_FAN53555
        bool "Enable Driver Model for REGULATOR FAN53555"
        depends on DM_PMIC_FAN53555

diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index bc736068bca7feef4796831b6961ca0bb95160ee..68e4c0f9dd3ce5af580c08f96cfd0d8f05c3f1ac 100644 (file)
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_REGULATOR_ACT8846) += act8846.o
 obj-$(CONFIG_REGULATOR_AS3722) += as3722_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_DA9063) += da9063.o
 obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o
+obj-$(CONFIG_DM_REGULATOR_NPCM8XX) += npcm8xx_regulator.o
 obj-$(CONFIG_$(SPL_)DM_PMIC_PFUZE100) += pfuze100.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_BD71837) += bd71837.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_PCA9450) += pca9450.o

diff --git a/drivers/power/regulator/npcm8xx_regulator.c b/drivers/power/regulator/npcm8xx_regulator.c
new file mode 100644 (file)
index 0000000..fcd1058
--- /dev/null
+++ b/drivers/power/regulator/npcm8xx_regulator.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2022 Nuvoton Technology Corp.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <dm/device_compat.h>
+#include <power/regulator.h>
+
+#define REG_VSRCR      0xf08000e8      /* Voltage Supply Control Register */
+
+/* Supported voltage levels (uV) */
+static const u32 volts_type1[] = { 3300000, 1800000 };
+static const u32 volts_type2[] = { 1000000, 1800000 };
+#define VOLT_LEV0      0
+#define VOLT_LEV1      1
+
+struct volt_supply {
+       char *name;
+       const u32 *volts;
+       u32 reg_shift;  /* Register bit offset for setting voltage */
+};
+
+static const struct volt_supply npcm8xx_volt_supps[] = {
+       {"v1", volts_type1, 0},
+       {"v2", volts_type1, 1},
+       {"v3", volts_type1, 2},
+       {"v4", volts_type1, 3},
+       {"v5", volts_type1, 4},
+       {"v6", volts_type1, 5},
+       {"v7", volts_type1, 6},
+       {"v8", volts_type1, 7},
+       {"v9", volts_type1, 8},
+       {"v10", volts_type1, 9},
+       {"v11", volts_type2, 10},
+       {"v12", volts_type1, 11},
+       {"v13", volts_type1, 12},
+       {"v14", volts_type2, 13},
+       {"vsif", volts_type1, 14},
+       {"vr2", volts_type1, 30},
+};
+
+static const struct volt_supply *npcm8xx_volt_supply_get(const char *name)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(npcm8xx_volt_supps); i++) {
+               if (!strcmp(npcm8xx_volt_supps[i].name, name))
+                       return &npcm8xx_volt_supps[i];
+       }
+
+       return NULL;
+}
+
+static int npcm8xx_regulator_set_value(struct udevice *dev, int uV)
+{
+       struct dm_regulator_uclass_plat *uc_pdata;
+       const struct volt_supply *supp;
+       u32 val, level;
+
+       uc_pdata = dev_get_uclass_plat(dev);
+       if (!uc_pdata)
+               return -ENXIO;
+
+       dev_dbg(dev, "%s set_value: %d\n", uc_pdata->name, uV);
+       supp = npcm8xx_volt_supply_get(uc_pdata->name);
+       if (!supp)
+               return -ENOENT;
+
+       if (uV == supp->volts[VOLT_LEV0])
+               level = VOLT_LEV0;
+       else if (uV == supp->volts[VOLT_LEV1])
+               level = VOLT_LEV1;
+       else
+               return -EINVAL;
+
+       /* Set voltage level */
+       val = readl(REG_VSRCR);
+       val &= ~BIT(supp->reg_shift);
+       val |= level << supp->reg_shift;
+       writel(val, REG_VSRCR);
+
+       return 0;
+}
+
+static int npcm8xx_regulator_get_value(struct udevice *dev)
+{
+       struct dm_regulator_uclass_plat *uc_pdata;
+       const struct volt_supply *supp;
+       u32 val;
+
+       uc_pdata = dev_get_uclass_plat(dev);
+       if (!uc_pdata)
+               return -ENXIO;
+
+       supp = npcm8xx_volt_supply_get(uc_pdata->name);
+       if (!supp)
+               return -ENOENT;
+
+       val = readl(REG_VSRCR) & BIT(supp->reg_shift);
+
+       dev_dbg(dev, "%s get_value: %d\n", uc_pdata->name,
+               val ? supp->volts[VOLT_LEV1] : supp->volts[VOLT_LEV0]);
+
+       return val ? supp->volts[VOLT_LEV1] : supp->volts[VOLT_LEV0];
+}
+
+static int npcm8xx_regulator_set_enable(struct udevice *dev, bool enable)
+{
+       /* Always on */
+       return 0;
+}
+
+static const struct dm_regulator_ops npcm8xx_regulator_ops = {
+       .set_value      = npcm8xx_regulator_set_value,
+       .get_value      = npcm8xx_regulator_get_value,
+       .set_enable     = npcm8xx_regulator_set_enable,
+};
+
+static const struct udevice_id npcm8xx_regulator_ids[] = {
+       { .compatible = "regulator-npcm845" },
+       { },
+};
+
+U_BOOT_DRIVER(regulator_npcm8xx) = {
+       .name = "regulator_npcm845",
+       .id = UCLASS_REGULATOR,
+       .ops = &npcm8xx_regulator_ops,
+       .of_match = npcm8xx_regulator_ids,
+};