Add support for setting NPCM845 voltage supply
regulator-force-microvolt is npcm proprietary property to set the voltage level.
Signed-off-by: Jim Liu JJLIU0@nuvoton.com --- drivers/power/regulator/Kconfig | 8 ++ drivers/power/regulator/Makefile | 1 + drivers/power/regulator/npcm8xx_regulator.c | 133 ++++++++++++++++++++ 3 files changed, 142 insertions(+) create mode 100644 drivers/power/regulator/npcm8xx_regulator.c
diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig index c519e066ef..e5f06874de 100644 --- 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 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 bc736068bc..68e4c0f9dd 100644 --- 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 index 0000000000..7903287132 --- /dev/null +++ b/drivers/power/regulator/npcm8xx_regulator.c @@ -0,0 +1,133 @@ +// 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]); + if (val) + return supp->volts[VOLT_LEV1]; + else + return 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, +};