267 lines
6.5 KiB
C
267 lines
6.5 KiB
C
/*
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* arizona-ldo1.c -- LDO1 supply for Arizona devices
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*
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* Copyright 2012 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/platform_device.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/gpio.h>
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#include <linux/slab.h>
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#include <linux/mfd/arizona/core.h>
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#include <linux/mfd/arizona/pdata.h>
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#include <linux/mfd/arizona/registers.h>
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struct arizona_ldo1 {
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struct regulator_dev *regulator;
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struct arizona *arizona;
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struct regulator_consumer_supply supply;
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struct regulator_init_data init_data;
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};
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static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
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unsigned int selector)
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{
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if (selector >= rdev->desc->n_voltages)
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return -EINVAL;
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if (selector == rdev->desc->n_voltages - 1)
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return 1800000;
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else
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return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
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}
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static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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int sel;
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sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
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if (sel >= rdev->desc->n_voltages)
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sel = rdev->desc->n_voltages - 1;
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return sel;
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}
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static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
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unsigned sel)
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{
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struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
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struct regmap *regmap = ldo->arizona->regmap;
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unsigned int val;
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int ret;
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if (sel == rdev->desc->n_voltages - 1)
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val = ARIZONA_LDO1_HI_PWR;
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else
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val = 0;
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ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
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ARIZONA_LDO1_HI_PWR, val);
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if (ret != 0)
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return ret;
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ret = regmap_update_bits(regmap, ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
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ARIZONA_SUBSYS_MAX_FREQ, val);
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if (ret != 0)
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return ret;
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if (val)
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return 0;
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val = sel << ARIZONA_LDO1_VSEL_SHIFT;
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return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
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ARIZONA_LDO1_VSEL_MASK, val);
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}
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static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
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struct regmap *regmap = ldo->arizona->regmap;
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unsigned int val;
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int ret;
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ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
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if (ret != 0)
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return ret;
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if (val & ARIZONA_LDO1_HI_PWR)
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return rdev->desc->n_voltages - 1;
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ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
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if (ret != 0)
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return ret;
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return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
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}
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static struct regulator_ops arizona_ldo1_hc_ops = {
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.list_voltage = arizona_ldo1_hc_list_voltage,
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.map_voltage = arizona_ldo1_hc_map_voltage,
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.get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
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.set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
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.get_bypass = regulator_get_bypass_regmap,
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.set_bypass = regulator_set_bypass_regmap,
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};
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static const struct regulator_desc arizona_ldo1_hc = {
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.name = "LDO1",
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.supply_name = "LDOVDD",
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.type = REGULATOR_VOLTAGE,
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.ops = &arizona_ldo1_hc_ops,
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.bypass_reg = ARIZONA_LDO1_CONTROL_1,
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.bypass_mask = ARIZONA_LDO1_BYPASS,
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.min_uV = 900000,
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.uV_step = 50000,
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.n_voltages = 8,
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.enable_time = 1500,
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.owner = THIS_MODULE,
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};
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static struct regulator_ops arizona_ldo1_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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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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.get_bypass = regulator_get_bypass_regmap,
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.set_bypass = regulator_set_bypass_regmap,
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};
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static const struct regulator_desc arizona_ldo1 = {
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.name = "LDO1",
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.supply_name = "LDOVDD",
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.type = REGULATOR_VOLTAGE,
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.ops = &arizona_ldo1_ops,
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.vsel_reg = ARIZONA_LDO1_CONTROL_1,
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.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
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.bypass_reg = ARIZONA_LDO1_CONTROL_1,
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.bypass_mask = ARIZONA_LDO1_BYPASS,
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.min_uV = 900000,
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.uV_step = 50000,
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.n_voltages = 7,
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.enable_time = 500,
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.owner = THIS_MODULE,
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};
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static const struct regulator_init_data arizona_ldo1_dvfs = {
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.constraints = {
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.min_uV = 1200000,
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.max_uV = 1800000,
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.valid_ops_mask = REGULATOR_CHANGE_STATUS |
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REGULATOR_CHANGE_VOLTAGE,
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},
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.num_consumer_supplies = 1,
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};
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static const struct regulator_init_data arizona_ldo1_default = {
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.constraints = {
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.valid_ops_mask = REGULATOR_CHANGE_STATUS,
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},
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.num_consumer_supplies = 1,
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};
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static int arizona_ldo1_probe(struct platform_device *pdev)
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{
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struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
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const struct regulator_desc *desc;
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struct regulator_config config = { };
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struct arizona_ldo1 *ldo1;
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int ret;
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ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
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if (ldo1 == NULL) {
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dev_err(&pdev->dev, "Unable to allocate private data\n");
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return -ENOMEM;
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}
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ldo1->arizona = arizona;
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/*
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* Since the chip usually supplies itself we provide some
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* default init_data for it. This will be overridden with
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* platform data if provided.
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*/
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switch (arizona->type) {
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case WM5102:
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desc = &arizona_ldo1_hc;
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ldo1->init_data = arizona_ldo1_dvfs;
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break;
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default:
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desc = &arizona_ldo1;
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ldo1->init_data = arizona_ldo1_default;
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break;
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}
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ldo1->init_data.consumer_supplies = &ldo1->supply;
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ldo1->supply.supply = "DCVDD";
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ldo1->supply.dev_name = dev_name(arizona->dev);
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config.dev = arizona->dev;
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config.driver_data = ldo1;
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config.regmap = arizona->regmap;
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config.ena_gpio = arizona->pdata.ldoena;
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if (arizona->pdata.ldo1)
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config.init_data = arizona->pdata.ldo1;
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else
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config.init_data = &ldo1->init_data;
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ldo1->regulator = regulator_register(desc, &config);
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if (IS_ERR(ldo1->regulator)) {
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ret = PTR_ERR(ldo1->regulator);
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dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
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ret);
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return ret;
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}
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platform_set_drvdata(pdev, ldo1);
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return 0;
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}
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static int arizona_ldo1_remove(struct platform_device *pdev)
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{
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struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
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regulator_unregister(ldo1->regulator);
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return 0;
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}
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static struct platform_driver arizona_ldo1_driver = {
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.probe = arizona_ldo1_probe,
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.remove = arizona_ldo1_remove,
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.driver = {
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.name = "arizona-ldo1",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(arizona_ldo1_driver);
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/* Module information */
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("Arizona LDO1 driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:arizona-ldo1");
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