295 lines
7.7 KiB
C
295 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Device driver for regulators in Hisi IC
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//
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// Copyright (c) 2013 Linaro Ltd.
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// Copyright (c) 2011 HiSilicon Ltd.
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// Copyright (c) 2020-2021 Huawei Technologies Co., Ltd.
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//
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// Guodong Xu <guodong.xu@linaro.org>
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#include <linux/delay.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/spmi.h>
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struct hi6421_spmi_reg_priv {
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/* Serialize regulator enable logic */
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struct mutex enable_mutex;
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};
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struct hi6421_spmi_reg_info {
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struct regulator_desc desc;
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u8 eco_mode_mask;
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u32 eco_uA;
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};
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static const unsigned int range_1v5_to_2v0[] = {
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1500000, 1550000, 1600000, 1650000,
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1700000, 1725000, 1750000, 1775000,
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1800000, 1825000, 1850000, 1875000,
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1900000, 1925000, 1950000, 2000000
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};
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static const unsigned int range_1v725_to_1v9[] = {
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1725000, 1750000, 1775000, 1800000,
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1825000, 1850000, 1875000, 1900000
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};
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static const unsigned int range_1v75_to_3v3[] = {
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1750000, 1800000, 1825000, 2800000,
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2850000, 2950000, 3000000, 3300000
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};
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static const unsigned int range_1v8_to_3v0[] = {
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1800000, 1850000, 2400000, 2600000,
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2700000, 2850000, 2950000, 3000000
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};
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static const unsigned int range_2v5_to_3v3[] = {
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2500000, 2600000, 2700000, 2800000,
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3000000, 3100000, 3200000, 3300000
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};
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static const unsigned int range_2v6_to_3v3[] = {
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2600000, 2700000, 2800000, 2900000,
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3000000, 3100000, 3200000, 3300000
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};
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/**
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* HI6421V600_LDO() - specify a LDO power line
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* @_id: LDO id name string
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* @vtable: voltage table
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* @ereg: enable register
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* @emask: enable mask
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* @vreg: voltage select register
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* @odelay: off/on delay time in uS
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* @etime: enable time in uS
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* @ecomask: eco mode mask
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* @ecoamp: eco mode load uppler limit in uA
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*/
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#define HI6421V600_LDO(_id, vtable, ereg, emask, vreg, \
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odelay, etime, ecomask, ecoamp) \
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[hi6421v600_##_id] = { \
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.desc = { \
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.name = #_id, \
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.of_match = of_match_ptr(#_id), \
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.regulators_node = of_match_ptr("regulators"), \
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.ops = &hi6421_spmi_ldo_rops, \
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.type = REGULATOR_VOLTAGE, \
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.id = hi6421v600_##_id, \
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.owner = THIS_MODULE, \
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.volt_table = vtable, \
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.n_voltages = ARRAY_SIZE(vtable), \
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.vsel_mask = ARRAY_SIZE(vtable) - 1, \
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.vsel_reg = vreg, \
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.enable_reg = ereg, \
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.enable_mask = emask, \
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.enable_time = etime, \
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.ramp_delay = etime, \
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.off_on_delay = odelay, \
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}, \
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.eco_mode_mask = ecomask, \
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.eco_uA = ecoamp, \
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}
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static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
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{
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struct hi6421_spmi_reg_priv *priv = rdev_get_drvdata(rdev);
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int ret;
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/* cannot enable more than one regulator at one time */
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mutex_lock(&priv->enable_mutex);
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ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
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rdev->desc->enable_mask,
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rdev->desc->enable_mask);
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/* Avoid powering up multiple devices at the same time */
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usleep_range(rdev->desc->off_on_delay, rdev->desc->off_on_delay + 60);
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mutex_unlock(&priv->enable_mutex);
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return ret;
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}
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static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
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{
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struct hi6421_spmi_reg_info *sreg;
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unsigned int reg_val;
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sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
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regmap_read(rdev->regmap, rdev->desc->enable_reg, ®_val);
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if (reg_val & sreg->eco_mode_mask)
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return REGULATOR_MODE_IDLE;
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return REGULATOR_MODE_NORMAL;
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}
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static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
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unsigned int mode)
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{
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struct hi6421_spmi_reg_info *sreg;
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unsigned int val;
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sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
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switch (mode) {
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case REGULATOR_MODE_NORMAL:
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val = 0;
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break;
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case REGULATOR_MODE_IDLE:
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if (!sreg->eco_mode_mask)
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return -EINVAL;
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val = sreg->eco_mode_mask;
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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, rdev->desc->enable_reg,
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sreg->eco_mode_mask, val);
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}
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static unsigned int
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hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
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int input_uV, int output_uV,
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int load_uA)
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{
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struct hi6421_spmi_reg_info *sreg;
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sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
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if (!sreg->eco_uA || ((unsigned int)load_uA > sreg->eco_uA))
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return REGULATOR_MODE_NORMAL;
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return REGULATOR_MODE_IDLE;
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}
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static const struct regulator_ops hi6421_spmi_ldo_rops = {
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.is_enabled = regulator_is_enabled_regmap,
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.enable = hi6421_spmi_regulator_enable,
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.disable = regulator_disable_regmap,
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.list_voltage = regulator_list_voltage_table,
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.map_voltage = regulator_map_voltage_ascend,
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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_mode = hi6421_spmi_regulator_get_mode,
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.set_mode = hi6421_spmi_regulator_set_mode,
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.get_optimum_mode = hi6421_spmi_regulator_get_optimum_mode,
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};
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/* HI6421v600 regulators with known registers */
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enum hi6421_spmi_regulator_id {
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hi6421v600_ldo3,
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hi6421v600_ldo4,
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hi6421v600_ldo9,
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hi6421v600_ldo15,
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hi6421v600_ldo16,
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hi6421v600_ldo17,
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hi6421v600_ldo33,
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hi6421v600_ldo34,
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};
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static struct hi6421_spmi_reg_info regulator_info[] = {
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HI6421V600_LDO(ldo3, range_1v5_to_2v0,
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0x16, 0x01, 0x51,
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20000, 120,
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0, 0),
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HI6421V600_LDO(ldo4, range_1v725_to_1v9,
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0x17, 0x01, 0x52,
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20000, 120,
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0x10, 10000),
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HI6421V600_LDO(ldo9, range_1v75_to_3v3,
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0x1c, 0x01, 0x57,
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20000, 360,
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0x10, 10000),
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HI6421V600_LDO(ldo15, range_1v8_to_3v0,
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0x21, 0x01, 0x5c,
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20000, 360,
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0x10, 10000),
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HI6421V600_LDO(ldo16, range_1v8_to_3v0,
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0x22, 0x01, 0x5d,
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20000, 360,
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0x10, 10000),
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HI6421V600_LDO(ldo17, range_2v5_to_3v3,
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0x23, 0x01, 0x5e,
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20000, 120,
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0x10, 10000),
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HI6421V600_LDO(ldo33, range_2v5_to_3v3,
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0x32, 0x01, 0x6d,
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20000, 120,
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0, 0),
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HI6421V600_LDO(ldo34, range_2v6_to_3v3,
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0x33, 0x01, 0x6e,
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20000, 120,
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0, 0),
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};
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static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
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{
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struct device *pmic_dev = pdev->dev.parent;
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struct regulator_config config = { };
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struct hi6421_spmi_reg_priv *priv;
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struct hi6421_spmi_reg_info *info;
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struct device *dev = &pdev->dev;
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struct regmap *regmap;
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struct regulator_dev *rdev;
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int i;
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/*
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* This driver is meant to be called by hi6421-spmi-core,
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* which should first set drvdata. If this doesn't happen, hit
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* a warn on and return.
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*/
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regmap = dev_get_drvdata(pmic_dev);
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if (WARN_ON(!regmap))
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return -ENODEV;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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mutex_init(&priv->enable_mutex);
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for (i = 0; i < ARRAY_SIZE(regulator_info); i++) {
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info = ®ulator_info[i];
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config.dev = pdev->dev.parent;
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config.driver_data = priv;
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config.regmap = regmap;
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rdev = devm_regulator_register(dev, &info->desc, &config);
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if (IS_ERR(rdev)) {
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dev_err(dev, "failed to register %s\n",
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info->desc.name);
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return PTR_ERR(rdev);
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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 platform_device_id hi6421_spmi_regulator_table[] = {
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{ .name = "hi6421v600-regulator" },
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{},
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};
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MODULE_DEVICE_TABLE(platform, hi6421_spmi_regulator_table);
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static struct platform_driver hi6421_spmi_regulator_driver = {
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.id_table = hi6421_spmi_regulator_table,
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.driver = {
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.name = "hi6421v600-regulator",
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},
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.probe = hi6421_spmi_regulator_probe,
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};
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module_platform_driver(hi6421_spmi_regulator_driver);
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MODULE_DESCRIPTION("Hi6421v600 SPMI regulator driver");
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MODULE_LICENSE("GPL v2");
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