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