diff options
Diffstat (limited to 'drivers/regulator/mt6370-regulator.c')
| -rw-r--r-- | drivers/regulator/mt6370-regulator.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/drivers/regulator/mt6370-regulator.c b/drivers/regulator/mt6370-regulator.c new file mode 100644 index 0000000000..27cb32b726 --- /dev/null +++ b/drivers/regulator/mt6370-regulator.c @@ -0,0 +1,391 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <linux/bits.h> +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> + +enum { + MT6370_IDX_DSVBOOST = 0, + MT6370_IDX_DSVPOS, + MT6370_IDX_DSVNEG, + MT6370_IDX_VIBLDO, + MT6370_MAX_IDX +}; + +#define MT6370_REG_LDO_CFG 0x180 +#define MT6370_REG_LDO_VOUT 0x181 +#define MT6370_REG_DB_CTRL1 0x1B0 +#define MT6370_REG_DB_CTRL2 0x1B1 +#define MT6370_REG_DB_VBST 0x1B2 +#define MT6370_REG_DB_VPOS 0x1B3 +#define MT6370_REG_DB_VNEG 0x1B4 +#define MT6370_REG_LDO_STAT 0x1DC +#define MT6370_REG_DB_STAT 0x1DF + +#define MT6370_LDOOMS_MASK BIT(7) +#define MT6370_LDOEN_MASK BIT(7) +#define MT6370_LDOVOUT_MASK GENMASK(3, 0) +#define MT6370_DBPERD_MASK (BIT(7) | BIT(4)) +#define MT6370_DBEXTEN_MASK BIT(0) +#define MT6370_DBVPOSEN_MASK BIT(6) +#define MT6370_DBVPOSDISG_MASK BIT(5) +#define MT6370_DBVNEGEN_MASK BIT(3) +#define MT6370_DBVNEGDISG_MASK BIT(2) +#define MT6370_DBALLON_MASK (MT6370_DBVPOSEN_MASK | MT6370_DBVNEGEN_MASK) +#define MT6370_DBSLEW_MASK GENMASK(7, 6) +#define MT6370_DBVOUT_MASK GENMASK(5, 0) +#define MT6370_LDOOC_EVT_MASK BIT(7) +#define MT6370_POSSCP_EVT_MASK BIT(7) +#define MT6370_NEGSCP_EVT_MASK BIT(6) +#define MT6370_BSTOCP_EVT_MASK BIT(5) +#define MT6370_POSOCP_EVT_MASK BIT(4) +#define MT6370_NEGOCP_EVT_MASK BIT(3) + +#define MT6370_LDO_MINUV 1600000 +#define MT6370_LDO_STPUV 200000 +#define MT6370_LDO_N_VOLT 13 +#define MT6370_DBVBOOST_MINUV 4000000 +#define MT6370_DBVBOOST_STPUV 50000 +#define MT6370_DBVBOOST_N_VOLT 45 +#define MT6370_DBVOUT_MINUV 4000000 +#define MT6370_DBVOUT_STPUV 50000 +#define MT6370_DBVOUT_N_VOLT 41 + +struct mt6370_priv { + struct device *dev; + struct regmap *regmap; + struct regulator_dev *rdev[MT6370_MAX_IDX]; + bool use_external_ctrl; +}; + +static const unsigned int mt6370_vpos_ramp_tbl[] = { 8540, 5840, 4830, 3000 }; +static const unsigned int mt6370_vneg_ramp_tbl[] = { 10090, 6310, 5050, 3150 }; + +static int mt6370_get_error_flags(struct regulator_dev *rdev, + unsigned int *flags) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int stat_reg, stat, rpt_flags = 0; + int rid = rdev_get_id(rdev), ret; + + if (rid == MT6370_IDX_VIBLDO) + stat_reg = MT6370_REG_LDO_STAT; + else + stat_reg = MT6370_REG_DB_STAT; + + ret = regmap_read(regmap, stat_reg, &stat); + if (ret) + return ret; + + switch (rid) { + case MT6370_IDX_DSVBOOST: + if (stat & MT6370_BSTOCP_EVT_MASK) + rpt_flags |= REGULATOR_ERROR_OVER_CURRENT; + break; + case MT6370_IDX_DSVPOS: + if (stat & MT6370_POSSCP_EVT_MASK) + rpt_flags |= REGULATOR_ERROR_UNDER_VOLTAGE; + + if (stat & MT6370_POSOCP_EVT_MASK) + rpt_flags |= REGULATOR_ERROR_OVER_CURRENT; + break; + case MT6370_IDX_DSVNEG: + if (stat & MT6370_NEGSCP_EVT_MASK) + rpt_flags |= REGULATOR_ERROR_UNDER_VOLTAGE; + + if (stat & MT6370_NEGOCP_EVT_MASK) + rpt_flags |= REGULATOR_ERROR_OVER_CURRENT; + break; + default: + if (stat & MT6370_LDOOC_EVT_MASK) + rpt_flags |= REGULATOR_ERROR_OVER_CURRENT; + break; + } + + *flags = rpt_flags; + return 0; +} + +static const struct regulator_ops mt6370_dbvboost_ops = { + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .list_voltage = regulator_list_voltage_linear, + .get_bypass = regulator_get_bypass_regmap, + .set_bypass = regulator_set_bypass_regmap, + .get_error_flags = mt6370_get_error_flags, +}; + +static const struct regulator_ops mt6370_dbvout_ops = { + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .list_voltage = regulator_list_voltage_linear, + .is_enabled = regulator_is_enabled_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .set_active_discharge = regulator_set_active_discharge_regmap, + .set_ramp_delay = regulator_set_ramp_delay_regmap, + .get_error_flags = mt6370_get_error_flags, +}; + +static const struct regulator_ops mt6370_ldo_ops = { + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .list_voltage = regulator_list_voltage_linear, + .is_enabled = regulator_is_enabled_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .set_active_discharge = regulator_set_active_discharge_regmap, + .get_error_flags = mt6370_get_error_flags, +}; + +static int mt6370_of_parse_cb(struct device_node *np, + const struct regulator_desc *desc, + struct regulator_config *config) +{ + struct mt6370_priv *priv = config->driver_data; + struct gpio_desc *enable_gpio; + int ret; + + enable_gpio = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0, + GPIOD_OUT_HIGH | + GPIOD_FLAGS_BIT_NONEXCLUSIVE, + desc->name); + if (IS_ERR(enable_gpio)) { + config->ena_gpiod = NULL; + return 0; + } + + /* + * RG control by default + * Only if all are using external pin, change all by external control + */ + if (priv->use_external_ctrl) { + ret = regmap_update_bits(priv->regmap, MT6370_REG_DB_CTRL1, + MT6370_DBEXTEN_MASK, + MT6370_DBEXTEN_MASK); + if (ret) + return ret; + } + + config->ena_gpiod = enable_gpio; + priv->use_external_ctrl = true; + return 0; +} + +static const struct regulator_desc mt6370_regulator_descs[] = { + { + .name = "mt6370-dsv-vbst", + .of_match = of_match_ptr("dsvbst"), + .regulators_node = of_match_ptr("regulators"), + .id = MT6370_IDX_DSVBOOST, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .ops = &mt6370_dbvboost_ops, + .min_uV = MT6370_DBVBOOST_MINUV, + .uV_step = MT6370_DBVBOOST_STPUV, + .n_voltages = MT6370_DBVBOOST_N_VOLT, + .vsel_reg = MT6370_REG_DB_VBST, + .vsel_mask = MT6370_DBVOUT_MASK, + .bypass_reg = MT6370_REG_DB_CTRL1, + .bypass_mask = MT6370_DBPERD_MASK, + .bypass_val_on = MT6370_DBPERD_MASK, + }, + { + .name = "mt6370-dsv-vpos", + .of_match = of_match_ptr("dsvpos"), + .regulators_node = of_match_ptr("regulators"), + .id = MT6370_IDX_DSVPOS, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .of_parse_cb = mt6370_of_parse_cb, + .ops = &mt6370_dbvout_ops, + .min_uV = MT6370_DBVOUT_MINUV, + .uV_step = MT6370_DBVOUT_STPUV, + .n_voltages = MT6370_DBVOUT_N_VOLT, + .vsel_reg = MT6370_REG_DB_VPOS, + .vsel_mask = MT6370_DBVOUT_MASK, + .enable_reg = MT6370_REG_DB_CTRL2, + .enable_mask = MT6370_DBVPOSEN_MASK, + .ramp_reg = MT6370_REG_DB_VPOS, + .ramp_mask = MT6370_DBSLEW_MASK, + .ramp_delay_table = mt6370_vpos_ramp_tbl, + .n_ramp_values = ARRAY_SIZE(mt6370_vpos_ramp_tbl), + .active_discharge_reg = MT6370_REG_DB_CTRL2, + .active_discharge_mask = MT6370_DBVPOSDISG_MASK, + .active_discharge_on = MT6370_DBVPOSDISG_MASK, + }, + { + .name = "mt6370-dsv-vneg", + .of_match = of_match_ptr("dsvneg"), + .regulators_node = of_match_ptr("regulators"), + .id = MT6370_IDX_DSVNEG, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .of_parse_cb = mt6370_of_parse_cb, + .ops = &mt6370_dbvout_ops, + .min_uV = MT6370_DBVOUT_MINUV, + .uV_step = MT6370_DBVOUT_STPUV, + .n_voltages = MT6370_DBVOUT_N_VOLT, + .vsel_reg = MT6370_REG_DB_VNEG, + .vsel_mask = MT6370_DBVOUT_MASK, + .enable_reg = MT6370_REG_DB_CTRL2, + .enable_mask = MT6370_DBVNEGEN_MASK, + .ramp_reg = MT6370_REG_DB_VNEG, + .ramp_mask = MT6370_DBSLEW_MASK, + .ramp_delay_table = mt6370_vneg_ramp_tbl, + .n_ramp_values = ARRAY_SIZE(mt6370_vneg_ramp_tbl), + .active_discharge_reg = MT6370_REG_DB_CTRL2, + .active_discharge_mask = MT6370_DBVNEGDISG_MASK, + .active_discharge_on = MT6370_DBVNEGDISG_MASK, + }, + { + .name = "mt6370-vib-ldo", + .of_match = of_match_ptr("vibldo"), + .regulators_node = of_match_ptr("regulators"), + .id = MT6370_IDX_VIBLDO, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .ops = &mt6370_ldo_ops, + .min_uV = MT6370_LDO_MINUV, + .uV_step = MT6370_LDO_STPUV, + .n_voltages = MT6370_LDO_N_VOLT, + .vsel_reg = MT6370_REG_LDO_VOUT, + .vsel_mask = MT6370_LDOVOUT_MASK, + .enable_reg = MT6370_REG_LDO_VOUT, + .enable_mask = MT6370_LDOEN_MASK, + .active_discharge_reg = MT6370_REG_LDO_CFG, + .active_discharge_mask = MT6370_LDOOMS_MASK, + .active_discharge_on = MT6370_LDOOMS_MASK, + } +}; + +static irqreturn_t mt6370_scp_handler(int irq, void *data) +{ + struct regulator_dev *rdev = data; + + regulator_notifier_call_chain(rdev, REGULATOR_EVENT_UNDER_VOLTAGE, + NULL); + return IRQ_HANDLED; +} + +static irqreturn_t mt6370_ocp_handler(int irq, void *data) +{ + struct regulator_dev *rdev = data; + + regulator_notifier_call_chain(rdev, REGULATOR_EVENT_OVER_CURRENT, NULL); + return IRQ_HANDLED; +} + +static int mt6370_regulator_irq_register(struct mt6370_priv *priv) +{ + struct platform_device *pdev = to_platform_device(priv->dev); + static const struct { + const char *name; + int rid; + irq_handler_t handler; + } mt6370_irqs[] = { + { "db_vpos_scp", MT6370_IDX_DSVPOS, mt6370_scp_handler }, + { "db_vneg_scp", MT6370_IDX_DSVNEG, mt6370_scp_handler }, + { "db_vbst_ocp", MT6370_IDX_DSVBOOST, mt6370_ocp_handler }, + { "db_vpos_ocp", MT6370_IDX_DSVPOS, mt6370_ocp_handler }, + { "db_vneg_ocp", MT6370_IDX_DSVNEG, mt6370_ocp_handler }, + { "ldo_oc", MT6370_IDX_VIBLDO, mt6370_ocp_handler } + }; + struct regulator_dev *rdev; + int i, irq, ret; + + for (i = 0; i < ARRAY_SIZE(mt6370_irqs); i++) { + irq = platform_get_irq_byname(pdev, mt6370_irqs[i].name); + + rdev = priv->rdev[mt6370_irqs[i].rid]; + + ret = devm_request_threaded_irq(priv->dev, irq, NULL, + mt6370_irqs[i].handler, 0, + mt6370_irqs[i].name, rdev); + if (ret) { + dev_err(priv->dev, + "Failed to register (%d) interrupt\n", i); + return ret; + } + } + + return 0; +} + +static int mt6370_regualtor_register(struct mt6370_priv *priv) +{ + struct regulator_dev *rdev; + struct regulator_config cfg = {}; + struct device *parent = priv->dev->parent; + int i; + + cfg.dev = parent; + cfg.driver_data = priv; + + for (i = 0; i < MT6370_MAX_IDX; i++) { + rdev = devm_regulator_register(priv->dev, + mt6370_regulator_descs + i, + &cfg); + if (IS_ERR(rdev)) { + dev_err(priv->dev, + "Failed to register (%d) regulator\n", i); + return PTR_ERR(rdev); + } + + priv->rdev[i] = rdev; + } + + return 0; +} + +static int mt6370_regulator_probe(struct platform_device *pdev) +{ + struct mt6370_priv *priv; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = &pdev->dev; + + priv->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!priv->regmap) { + dev_err(&pdev->dev, "Failed to init regmap\n"); + return -ENODEV; + } + + ret = mt6370_regualtor_register(priv); + if (ret) + return ret; + + return mt6370_regulator_irq_register(priv); +} + +static const struct platform_device_id mt6370_devid_table[] = { + { "mt6370-regulator", 0}, + {} +}; +MODULE_DEVICE_TABLE(platform, mt6370_devid_table); + +static struct platform_driver mt6370_regulator_driver = { + .driver = { + .name = "mt6370-regulator", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .id_table = mt6370_devid_table, + .probe = mt6370_regulator_probe, +}; +module_platform_driver(mt6370_regulator_driver); + +MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); +MODULE_DESCRIPTION("Mediatek MT6370 Regulator Driver"); +MODULE_LICENSE("GPL v2"); |