292 lines
8.6 KiB
C
292 lines
8.6 KiB
C
/*
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* AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
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*
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* Copyright (C) 2012 Renesas Electronics Corporation
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* Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the version 2 of the GNU General Public License as
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* published by the Free Software Foundation
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/mfd/as3711.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/of_regulator.h>
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#include <linux/slab.h>
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struct as3711_regulator_info {
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struct regulator_desc desc;
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};
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struct as3711_regulator {
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struct as3711_regulator_info *reg_info;
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};
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/*
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* The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
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* STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
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* FAST: sdX_fast=1
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* NORMAL: low_noise=1
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* IDLE: low_noise=0
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*/
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static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
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{
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unsigned int fast_bit = rdev->desc->enable_mask,
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low_noise_bit = fast_bit << 4;
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u8 val;
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switch (mode) {
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case REGULATOR_MODE_FAST:
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val = fast_bit | low_noise_bit;
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break;
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case REGULATOR_MODE_NORMAL:
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val = low_noise_bit;
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break;
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case REGULATOR_MODE_IDLE:
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val = 0;
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break;
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default:
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return -EINVAL;
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}
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return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
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low_noise_bit | fast_bit, val);
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}
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static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
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{
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unsigned int fast_bit = rdev->desc->enable_mask,
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low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
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unsigned int val;
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int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
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if (ret < 0)
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return ret;
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if ((val & mask) == mask)
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return REGULATOR_MODE_FAST;
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if ((val & mask) == low_noise_bit)
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return REGULATOR_MODE_NORMAL;
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if (!(val & mask))
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return REGULATOR_MODE_IDLE;
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return -EINVAL;
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}
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static const struct regulator_ops as3711_sd_ops = {
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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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.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_range,
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.map_voltage = regulator_map_voltage_linear_range,
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.get_mode = as3711_get_mode_sd,
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.set_mode = as3711_set_mode_sd,
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};
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static const struct regulator_ops as3711_aldo_ops = {
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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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.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_range,
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.map_voltage = regulator_map_voltage_linear_range,
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};
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static const struct regulator_ops as3711_dldo_ops = {
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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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.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_range,
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.map_voltage = regulator_map_voltage_linear_range,
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};
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static const struct regulator_linear_range as3711_sd_ranges[] = {
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REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
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REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
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REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
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};
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static const struct regulator_linear_range as3711_aldo_ranges[] = {
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REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
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REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
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};
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static const struct regulator_linear_range as3711_dldo_ranges[] = {
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REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
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REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
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};
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#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx) \
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[AS3711_REGULATOR_ ## _id] = { \
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.desc = { \
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.name = "as3711-regulator-" # _id, \
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.id = AS3711_REGULATOR_ ## _id, \
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.n_voltages = (_vmask + 1), \
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.ops = &as3711_ ## _sfx ## _ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
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.vsel_mask = _vmask, \
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.enable_reg = AS3711_ ## _en_reg, \
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.enable_mask = BIT(_en_bit), \
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.linear_ranges = as3711_ ## _sfx ## _ranges, \
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.n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
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}, \
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}
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static struct as3711_regulator_info as3711_reg_info[] = {
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AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
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AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
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AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
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AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
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AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
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AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
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AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
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AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
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AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
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AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
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AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
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AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
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/* StepUp output voltage depends on supplying regulator */
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};
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#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
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static struct of_regulator_match
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as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
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[AS3711_REGULATOR_SD_1] = { .name = "sd1" },
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[AS3711_REGULATOR_SD_2] = { .name = "sd2" },
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[AS3711_REGULATOR_SD_3] = { .name = "sd3" },
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[AS3711_REGULATOR_SD_4] = { .name = "sd4" },
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[AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
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[AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
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[AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
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[AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
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[AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
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[AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
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[AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
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[AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
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};
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static int as3711_regulator_parse_dt(struct device *dev,
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struct device_node **of_node, const int count)
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{
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struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
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struct device_node *regulators =
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of_get_child_by_name(dev->parent->of_node, "regulators");
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struct of_regulator_match *match;
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int ret, i;
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if (!regulators) {
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dev_err(dev, "regulator node not found\n");
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return -ENODEV;
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}
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ret = of_regulator_match(dev->parent, regulators,
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as3711_regulator_matches, count);
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of_node_put(regulators);
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if (ret < 0) {
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dev_err(dev, "Error parsing regulator init data: %d\n", ret);
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return ret;
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}
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for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
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if (match->of_node) {
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pdata->init_data[i] = match->init_data;
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of_node[i] = match->of_node;
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}
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return 0;
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}
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static int as3711_regulator_probe(struct platform_device *pdev)
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{
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struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
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struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
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struct regulator_config config = {.dev = &pdev->dev,};
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struct as3711_regulator *reg = NULL;
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struct as3711_regulator *regs;
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struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
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struct regulator_dev *rdev;
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struct as3711_regulator_info *ri;
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int ret;
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int id;
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if (!pdata) {
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dev_err(&pdev->dev, "No platform data...\n");
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return -ENODEV;
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}
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if (pdev->dev.parent->of_node) {
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ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
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if (ret < 0) {
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dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
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return ret;
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}
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}
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regs = devm_kcalloc(&pdev->dev,
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AS3711_REGULATOR_NUM,
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sizeof(struct as3711_regulator),
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GFP_KERNEL);
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if (!regs)
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return -ENOMEM;
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for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
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reg = ®s[id];
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reg->reg_info = ri;
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config.init_data = pdata->init_data[id];
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config.driver_data = reg;
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config.regmap = as3711->regmap;
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config.of_node = of_node[id];
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rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
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if (IS_ERR(rdev)) {
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dev_err(&pdev->dev, "Failed to register regulator %s\n",
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ri->desc.name);
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return PTR_ERR(rdev);
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}
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}
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platform_set_drvdata(pdev, regs);
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return 0;
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}
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static struct platform_driver as3711_regulator_driver = {
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.driver = {
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.name = "as3711-regulator",
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},
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.probe = as3711_regulator_probe,
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};
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static int __init as3711_regulator_init(void)
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{
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return platform_driver_register(&as3711_regulator_driver);
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}
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subsys_initcall(as3711_regulator_init);
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static void __exit as3711_regulator_exit(void)
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{
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platform_driver_unregister(&as3711_regulator_driver);
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}
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module_exit(as3711_regulator_exit);
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MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
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MODULE_DESCRIPTION("AS3711 regulator driver");
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MODULE_ALIAS("platform:as3711-regulator");
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MODULE_LICENSE("GPL v2");
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