286 lines
7.2 KiB
C
286 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Lochnagar regulator driver
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//
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// Copyright (c) 2017-2018 Cirrus Logic, Inc. and
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// Cirrus Logic International Semiconductor Ltd.
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//
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// Author: Charles Keepax <ckeepax@opensource.cirrus.com>
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_device.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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#include <linux/regulator/of_regulator.h>
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#include <linux/mfd/lochnagar.h>
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#include <linux/mfd/lochnagar1_regs.h>
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#include <linux/mfd/lochnagar2_regs.h>
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static const struct regulator_ops lochnagar_micvdd_ops = {
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.list_voltage = regulator_list_voltage_linear_range,
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.map_voltage = regulator_map_voltage_linear_range,
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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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};
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static const struct linear_range lochnagar_micvdd_ranges[] = {
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REGULATOR_LINEAR_RANGE(1000000, 0, 0xC, 50000),
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REGULATOR_LINEAR_RANGE(1700000, 0xD, 0x1F, 100000),
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};
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static int lochnagar_micbias_enable(struct regulator_dev *rdev)
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{
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struct lochnagar *lochnagar = rdev_get_drvdata(rdev);
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int ret;
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mutex_lock(&lochnagar->analogue_config_lock);
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ret = regulator_enable_regmap(rdev);
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if (ret < 0)
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goto err;
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ret = lochnagar_update_config(lochnagar);
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err:
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mutex_unlock(&lochnagar->analogue_config_lock);
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return ret;
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}
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static int lochnagar_micbias_disable(struct regulator_dev *rdev)
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{
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struct lochnagar *lochnagar = rdev_get_drvdata(rdev);
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int ret;
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mutex_lock(&lochnagar->analogue_config_lock);
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ret = regulator_disable_regmap(rdev);
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if (ret < 0)
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goto err;
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ret = lochnagar_update_config(lochnagar);
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err:
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mutex_unlock(&lochnagar->analogue_config_lock);
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return ret;
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}
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static const struct regulator_ops lochnagar_micbias_ops = {
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.enable = lochnagar_micbias_enable,
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.disable = lochnagar_micbias_disable,
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.is_enabled = regulator_is_enabled_regmap,
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};
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static const struct regulator_ops lochnagar_vddcore_ops = {
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.list_voltage = regulator_list_voltage_linear_range,
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.map_voltage = regulator_map_voltage_linear_range,
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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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};
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static const struct linear_range lochnagar_vddcore_ranges[] = {
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REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0),
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REGULATOR_LINEAR_RANGE(600000, 0x8, 0x41, 12500),
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};
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enum lochnagar_regulators {
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LOCHNAGAR_MICVDD,
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LOCHNAGAR_MIC1VDD,
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LOCHNAGAR_MIC2VDD,
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LOCHNAGAR_VDDCORE,
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};
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static int lochnagar_micbias_of_parse(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 lochnagar *lochnagar = config->driver_data;
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int shift = (desc->id - LOCHNAGAR_MIC1VDD) *
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LOCHNAGAR2_P2_MICBIAS_SRC_SHIFT;
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int mask = LOCHNAGAR2_P1_MICBIAS_SRC_MASK << shift;
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unsigned int val;
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int ret;
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ret = of_property_read_u32(np, "cirrus,micbias-input", &val);
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if (ret >= 0) {
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mutex_lock(&lochnagar->analogue_config_lock);
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ret = regmap_update_bits(lochnagar->regmap,
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LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
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mask, val << shift);
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mutex_unlock(&lochnagar->analogue_config_lock);
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if (ret < 0) {
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dev_err(lochnagar->dev,
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"Failed to update micbias source: %d\n", ret);
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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 const struct regulator_desc lochnagar_regulators[] = {
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[LOCHNAGAR_MICVDD] = {
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.name = "MICVDD",
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.supply_name = "SYSVDD",
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.type = REGULATOR_VOLTAGE,
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.n_voltages = 32,
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.ops = &lochnagar_micvdd_ops,
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.id = LOCHNAGAR_MICVDD,
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.of_match = of_match_ptr("MICVDD"),
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.enable_reg = LOCHNAGAR2_MICVDD_CTRL1,
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.enable_mask = LOCHNAGAR2_MICVDD_REG_ENA_MASK,
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.vsel_reg = LOCHNAGAR2_MICVDD_CTRL2,
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.vsel_mask = LOCHNAGAR2_MICVDD_VSEL_MASK,
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.linear_ranges = lochnagar_micvdd_ranges,
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.n_linear_ranges = ARRAY_SIZE(lochnagar_micvdd_ranges),
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.enable_time = 3000,
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.ramp_delay = 1000,
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.owner = THIS_MODULE,
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},
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[LOCHNAGAR_MIC1VDD] = {
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.name = "MIC1VDD",
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.supply_name = "MICBIAS1",
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.type = REGULATOR_VOLTAGE,
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.ops = &lochnagar_micbias_ops,
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.id = LOCHNAGAR_MIC1VDD,
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.of_match = of_match_ptr("MIC1VDD"),
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.of_parse_cb = lochnagar_micbias_of_parse,
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.enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
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.enable_mask = LOCHNAGAR2_P1_INPUT_BIAS_ENA_MASK,
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.owner = THIS_MODULE,
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},
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[LOCHNAGAR_MIC2VDD] = {
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.name = "MIC2VDD",
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.supply_name = "MICBIAS2",
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.type = REGULATOR_VOLTAGE,
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.ops = &lochnagar_micbias_ops,
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.id = LOCHNAGAR_MIC2VDD,
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.of_match = of_match_ptr("MIC2VDD"),
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.of_parse_cb = lochnagar_micbias_of_parse,
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.enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
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.enable_mask = LOCHNAGAR2_P2_INPUT_BIAS_ENA_MASK,
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.owner = THIS_MODULE,
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},
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[LOCHNAGAR_VDDCORE] = {
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.name = "VDDCORE",
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.supply_name = "SYSVDD",
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.type = REGULATOR_VOLTAGE,
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.n_voltages = 66,
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.ops = &lochnagar_vddcore_ops,
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.id = LOCHNAGAR_VDDCORE,
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.of_match = of_match_ptr("VDDCORE"),
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.enable_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL1,
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.enable_mask = LOCHNAGAR2_VDDCORE_CDC_REG_ENA_MASK,
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.vsel_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL2,
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.vsel_mask = LOCHNAGAR2_VDDCORE_CDC_VSEL_MASK,
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.linear_ranges = lochnagar_vddcore_ranges,
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.n_linear_ranges = ARRAY_SIZE(lochnagar_vddcore_ranges),
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.enable_time = 3000,
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.ramp_delay = 1000,
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.off_on_delay = 15000,
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.owner = THIS_MODULE,
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},
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};
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static const struct of_device_id lochnagar_of_match[] = {
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{
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.compatible = "cirrus,lochnagar2-micvdd",
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.data = &lochnagar_regulators[LOCHNAGAR_MICVDD],
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},
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{
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.compatible = "cirrus,lochnagar2-mic1vdd",
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.data = &lochnagar_regulators[LOCHNAGAR_MIC1VDD],
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},
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{
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.compatible = "cirrus,lochnagar2-mic2vdd",
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.data = &lochnagar_regulators[LOCHNAGAR_MIC2VDD],
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},
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{
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.compatible = "cirrus,lochnagar2-vddcore",
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.data = &lochnagar_regulators[LOCHNAGAR_VDDCORE],
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},
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{}
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};
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MODULE_DEVICE_TABLE(of, lochnagar_of_match);
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static int lochnagar_regulator_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct lochnagar *lochnagar = dev_get_drvdata(dev->parent);
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struct regulator_config config = { };
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const struct of_device_id *of_id;
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const struct regulator_desc *desc;
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struct regulator_dev *rdev;
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int ret;
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config.dev = dev;
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config.regmap = lochnagar->regmap;
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config.driver_data = lochnagar;
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of_id = of_match_device(lochnagar_of_match, dev);
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if (!of_id)
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return -EINVAL;
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desc = of_id->data;
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rdev = devm_regulator_register(dev, desc, &config);
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if (IS_ERR(rdev)) {
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ret = PTR_ERR(rdev);
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dev_err(dev, "Failed to register %s regulator: %d\n",
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desc->name, ret);
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return ret;
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}
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return 0;
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}
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static struct platform_driver lochnagar_regulator_driver = {
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.driver = {
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.name = "lochnagar-regulator",
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.of_match_table = of_match_ptr(lochnagar_of_match),
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},
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.probe = lochnagar_regulator_probe,
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};
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module_platform_driver(lochnagar_regulator_driver);
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MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
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MODULE_DESCRIPTION("Regulator driver for Cirrus Logic Lochnagar Board");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:lochnagar-regulator");
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