diff options
Diffstat (limited to 'drivers/regulator/lochnagar-regulator.c')
| -rw-r--r-- | drivers/regulator/lochnagar-regulator.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/drivers/regulator/lochnagar-regulator.c b/drivers/regulator/lochnagar-regulator.c new file mode 100644 index 000000000..cb71fa5f4 --- /dev/null +++ b/drivers/regulator/lochnagar-regulator.c @@ -0,0 +1,285 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Lochnagar regulator driver +// +// Copyright (c) 2017-2018 Cirrus Logic, Inc. and +// Cirrus Logic International Semiconductor Ltd. +// +// Author: Charles Keepax <ckeepax@opensource.cirrus.com> + +#include <linux/bitops.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/of_regulator.h> + +#include <linux/mfd/lochnagar.h> +#include <linux/mfd/lochnagar1_regs.h> +#include <linux/mfd/lochnagar2_regs.h> + +static const struct regulator_ops lochnagar_micvdd_ops = { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + + .list_voltage = regulator_list_voltage_linear_range, + .map_voltage = regulator_map_voltage_linear_range, + + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, +}; + +static const struct linear_range lochnagar_micvdd_ranges[] = { + REGULATOR_LINEAR_RANGE(1000000, 0, 0xC, 50000), + REGULATOR_LINEAR_RANGE(1700000, 0xD, 0x1F, 100000), +}; + +static int lochnagar_micbias_enable(struct regulator_dev *rdev) +{ + struct lochnagar *lochnagar = rdev_get_drvdata(rdev); + int ret; + + mutex_lock(&lochnagar->analogue_config_lock); + + ret = regulator_enable_regmap(rdev); + if (ret < 0) + goto err; + + ret = lochnagar_update_config(lochnagar); + +err: + mutex_unlock(&lochnagar->analogue_config_lock); + + return ret; +} + +static int lochnagar_micbias_disable(struct regulator_dev *rdev) +{ + struct lochnagar *lochnagar = rdev_get_drvdata(rdev); + int ret; + + mutex_lock(&lochnagar->analogue_config_lock); + + ret = regulator_disable_regmap(rdev); + if (ret < 0) + goto err; + + ret = lochnagar_update_config(lochnagar); + +err: + mutex_unlock(&lochnagar->analogue_config_lock); + + return ret; +} + +static const struct regulator_ops lochnagar_micbias_ops = { + .enable = lochnagar_micbias_enable, + .disable = lochnagar_micbias_disable, + .is_enabled = regulator_is_enabled_regmap, +}; + +static const struct regulator_ops lochnagar_vddcore_ops = { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + + .list_voltage = regulator_list_voltage_linear_range, + .map_voltage = regulator_map_voltage_linear_range, + + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, +}; + +static const struct linear_range lochnagar_vddcore_ranges[] = { + REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0), + REGULATOR_LINEAR_RANGE(600000, 0x8, 0x41, 12500), +}; + +enum lochnagar_regulators { + LOCHNAGAR_MICVDD, + LOCHNAGAR_MIC1VDD, + LOCHNAGAR_MIC2VDD, + LOCHNAGAR_VDDCORE, +}; + +static int lochnagar_micbias_of_parse(struct device_node *np, + const struct regulator_desc *desc, + struct regulator_config *config) +{ + struct lochnagar *lochnagar = config->driver_data; + int shift = (desc->id - LOCHNAGAR_MIC1VDD) * + LOCHNAGAR2_P2_MICBIAS_SRC_SHIFT; + int mask = LOCHNAGAR2_P1_MICBIAS_SRC_MASK << shift; + unsigned int val; + int ret; + + ret = of_property_read_u32(np, "cirrus,micbias-input", &val); + if (ret >= 0) { + mutex_lock(&lochnagar->analogue_config_lock); + ret = regmap_update_bits(lochnagar->regmap, + LOCHNAGAR2_ANALOGUE_PATH_CTRL2, + mask, val << shift); + mutex_unlock(&lochnagar->analogue_config_lock); + if (ret < 0) { + dev_err(lochnagar->dev, + "Failed to update micbias source: %d\n", ret); + return ret; + } + } + + return 0; +} + +static const struct regulator_desc lochnagar_regulators[] = { + [LOCHNAGAR_MICVDD] = { + .name = "MICVDD", + .supply_name = "SYSVDD", + .type = REGULATOR_VOLTAGE, + .n_voltages = 32, + .ops = &lochnagar_micvdd_ops, + + .id = LOCHNAGAR_MICVDD, + .of_match = of_match_ptr("MICVDD"), + + .enable_reg = LOCHNAGAR2_MICVDD_CTRL1, + .enable_mask = LOCHNAGAR2_MICVDD_REG_ENA_MASK, + .vsel_reg = LOCHNAGAR2_MICVDD_CTRL2, + .vsel_mask = LOCHNAGAR2_MICVDD_VSEL_MASK, + + .linear_ranges = lochnagar_micvdd_ranges, + .n_linear_ranges = ARRAY_SIZE(lochnagar_micvdd_ranges), + + .enable_time = 3000, + .ramp_delay = 1000, + + .owner = THIS_MODULE, + }, + [LOCHNAGAR_MIC1VDD] = { + .name = "MIC1VDD", + .supply_name = "MICBIAS1", + .type = REGULATOR_VOLTAGE, + .ops = &lochnagar_micbias_ops, + + .id = LOCHNAGAR_MIC1VDD, + .of_match = of_match_ptr("MIC1VDD"), + .of_parse_cb = lochnagar_micbias_of_parse, + + .enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2, + .enable_mask = LOCHNAGAR2_P1_INPUT_BIAS_ENA_MASK, + + .owner = THIS_MODULE, + }, + [LOCHNAGAR_MIC2VDD] = { + .name = "MIC2VDD", + .supply_name = "MICBIAS2", + .type = REGULATOR_VOLTAGE, + .ops = &lochnagar_micbias_ops, + + .id = LOCHNAGAR_MIC2VDD, + .of_match = of_match_ptr("MIC2VDD"), + .of_parse_cb = lochnagar_micbias_of_parse, + + .enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2, + .enable_mask = LOCHNAGAR2_P2_INPUT_BIAS_ENA_MASK, + + .owner = THIS_MODULE, + }, + [LOCHNAGAR_VDDCORE] = { + .name = "VDDCORE", + .supply_name = "SYSVDD", + .type = REGULATOR_VOLTAGE, + .n_voltages = 66, + .ops = &lochnagar_vddcore_ops, + + .id = LOCHNAGAR_VDDCORE, + .of_match = of_match_ptr("VDDCORE"), + + .enable_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL1, + .enable_mask = LOCHNAGAR2_VDDCORE_CDC_REG_ENA_MASK, + .vsel_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL2, + .vsel_mask = LOCHNAGAR2_VDDCORE_CDC_VSEL_MASK, + + .linear_ranges = lochnagar_vddcore_ranges, + .n_linear_ranges = ARRAY_SIZE(lochnagar_vddcore_ranges), + + .enable_time = 3000, + .ramp_delay = 1000, + .off_on_delay = 15000, + + .owner = THIS_MODULE, + }, +}; + +static const struct of_device_id lochnagar_of_match[] = { + { + .compatible = "cirrus,lochnagar2-micvdd", + .data = &lochnagar_regulators[LOCHNAGAR_MICVDD], + }, + { + .compatible = "cirrus,lochnagar2-mic1vdd", + .data = &lochnagar_regulators[LOCHNAGAR_MIC1VDD], + }, + { + .compatible = "cirrus,lochnagar2-mic2vdd", + .data = &lochnagar_regulators[LOCHNAGAR_MIC2VDD], + }, + { + .compatible = "cirrus,lochnagar2-vddcore", + .data = &lochnagar_regulators[LOCHNAGAR_VDDCORE], + }, + {} +}; +MODULE_DEVICE_TABLE(of, lochnagar_of_match); + +static int lochnagar_regulator_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct lochnagar *lochnagar = dev_get_drvdata(dev->parent); + struct regulator_config config = { }; + const struct of_device_id *of_id; + const struct regulator_desc *desc; + struct regulator_dev *rdev; + int ret; + + config.dev = dev; + config.regmap = lochnagar->regmap; + config.driver_data = lochnagar; + + of_id = of_match_device(lochnagar_of_match, dev); + if (!of_id) + return -EINVAL; + + desc = of_id->data; + + rdev = devm_regulator_register(dev, desc, &config); + if (IS_ERR(rdev)) { + ret = PTR_ERR(rdev); + dev_err(dev, "Failed to register %s regulator: %d\n", + desc->name, ret); + return ret; + } + + return 0; +} + +static struct platform_driver lochnagar_regulator_driver = { + .driver = { + .name = "lochnagar-regulator", + .of_match_table = of_match_ptr(lochnagar_of_match), + }, + + .probe = lochnagar_regulator_probe, +}; +module_platform_driver(lochnagar_regulator_driver); + +MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>"); +MODULE_DESCRIPTION("Regulator driver for Cirrus Logic Lochnagar Board"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:lochnagar-regulator"); |