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linux-next/drivers/regulator/tps65218-regulator.c
Tero Kristo b9a0d35941 regulator: tps65218: Enable suspend configuration 
TPS65218 has a pre-defined power-up / power-down sequence which in
a typical application does not need to be changed. However, it is possible
to define custom sequences under I2C control. The power-up sequence is
defined by strobes and delay times. Each output rail is assigned to a
strobe to determine the order in which the rails are enabled.

Every regulator has sequence registers and every regulator has a default
strobe value and gets disabled when a particular power down sequence
occurs.

To keep a regulator on during suspend we write value 0 to strobe so
that the regulator is out of all sequencers and is not impacted by any
power down sequence. Hence saving the default strobe value during probe
so that when we want to regulator to be enabled during suspend we write 0
to strobe and when we want it to get disabled during suspend we write
the default saved strobe value.
This allows platform data to specify which power rails should be on or off
during RTC only suspend. This is necessary to keep DDR state while in RTC
only suspend.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-06-27 17:56:43 +01:00

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/*
* tps65218-regulator.c
*
* Regulator driver for TPS65218 PMIC
*
* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether expressed or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License version 2 for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/tps65218.h>
enum tps65218_regulators { DCDC1, DCDC2, DCDC3, DCDC4,
DCDC5, DCDC6, LDO1, LS3 };
#define TPS65218_REGULATOR(_name, _id, _type, _ops, _n, _vr, _vm, _er, _em, \
_cr, _cm, _lr, _nlr, _delay, _fuv, _sr, _sm) \
{ \
.name = _name, \
.id = _id, \
.ops = &_ops, \
.n_voltages = _n, \
.type = _type, \
.owner = THIS_MODULE, \
.vsel_reg = _vr, \
.vsel_mask = _vm, \
.csel_reg = _cr, \
.csel_mask = _cm, \
.enable_reg = _er, \
.enable_mask = _em, \
.volt_table = NULL, \
.linear_ranges = _lr, \
.n_linear_ranges = _nlr, \
.ramp_delay = _delay, \
.fixed_uV = _fuv, \
.bypass_reg = _sr, \
.bypass_mask = _sm, \
} \
#define TPS65218_INFO(_id, _nm, _min, _max) \
[_id] = { \
.id = _id, \
.name = _nm, \
.min_uV = _min, \
.max_uV = _max, \
}
static const struct regulator_linear_range dcdc1_dcdc2_ranges[] = {
REGULATOR_LINEAR_RANGE(850000, 0x0, 0x32, 10000),
REGULATOR_LINEAR_RANGE(1375000, 0x33, 0x3f, 25000),
};
static const struct regulator_linear_range ldo1_dcdc3_ranges[] = {
REGULATOR_LINEAR_RANGE(900000, 0x0, 0x1a, 25000),
REGULATOR_LINEAR_RANGE(1600000, 0x1b, 0x3f, 50000),
};
static const struct regulator_linear_range dcdc4_ranges[] = {
REGULATOR_LINEAR_RANGE(1175000, 0x0, 0xf, 25000),
REGULATOR_LINEAR_RANGE(1600000, 0x10, 0x34, 50000),
};
static struct tps_info tps65218_pmic_regs[] = {
TPS65218_INFO(DCDC1, "DCDC1", 850000, 1675000),
TPS65218_INFO(DCDC2, "DCDC2", 850000, 1675000),
TPS65218_INFO(DCDC3, "DCDC3", 900000, 3400000),
TPS65218_INFO(DCDC4, "DCDC4", 1175000, 3400000),
TPS65218_INFO(DCDC5, "DCDC5", 1000000, 1000000),
TPS65218_INFO(DCDC6, "DCDC6", 1800000, 1800000),
TPS65218_INFO(LDO1, "LDO1", 900000, 3400000),
TPS65218_INFO(LS3, "LS3", -1, -1),
};
#define TPS65218_OF_MATCH(comp, label) \
{ \
.compatible = comp, \
.data = &label, \
}
static const struct of_device_id tps65218_of_match[] = {
TPS65218_OF_MATCH("ti,tps65218-dcdc1", tps65218_pmic_regs[DCDC1]),
TPS65218_OF_MATCH("ti,tps65218-dcdc2", tps65218_pmic_regs[DCDC2]),
TPS65218_OF_MATCH("ti,tps65218-dcdc3", tps65218_pmic_regs[DCDC3]),
TPS65218_OF_MATCH("ti,tps65218-dcdc4", tps65218_pmic_regs[DCDC4]),
TPS65218_OF_MATCH("ti,tps65218-dcdc5", tps65218_pmic_regs[DCDC5]),
TPS65218_OF_MATCH("ti,tps65218-dcdc6", tps65218_pmic_regs[DCDC6]),
TPS65218_OF_MATCH("ti,tps65218-ldo1", tps65218_pmic_regs[LDO1]),
TPS65218_OF_MATCH("ti,tps65218-ls3", tps65218_pmic_regs[LS3]),
{ }
};
MODULE_DEVICE_TABLE(of, tps65218_of_match);
static int tps65218_pmic_set_voltage_sel(struct regulator_dev *dev,
unsigned selector)
{
int ret;
struct tps65218 *tps = rdev_get_drvdata(dev);
unsigned int rid = rdev_get_id(dev);
/* Set the voltage based on vsel value and write protect level is 2 */
ret = tps65218_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
selector, TPS65218_PROTECT_L1);
/* Set GO bit for DCDC1/2 to initiate voltage transistion */
switch (rid) {
case TPS65218_DCDC_1:
case TPS65218_DCDC_2:
ret = tps65218_set_bits(tps, TPS65218_REG_CONTRL_SLEW_RATE,
TPS65218_SLEW_RATE_GO,
TPS65218_SLEW_RATE_GO,
TPS65218_PROTECT_L1);
break;
}
return ret;
}
static int tps65218_pmic_enable(struct regulator_dev *dev)
{
struct tps65218 *tps = rdev_get_drvdata(dev);
int rid = rdev_get_id(dev);
if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
return -EINVAL;
/* Enable the regulator and password protection is level 1 */
return tps65218_set_bits(tps, dev->desc->enable_reg,
dev->desc->enable_mask, dev->desc->enable_mask,
TPS65218_PROTECT_L1);
}
static int tps65218_pmic_disable(struct regulator_dev *dev)
{
struct tps65218 *tps = rdev_get_drvdata(dev);
int rid = rdev_get_id(dev);
if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
return -EINVAL;
/* Disable the regulator and password protection is level 1 */
return tps65218_clear_bits(tps, dev->desc->enable_reg,
dev->desc->enable_mask, TPS65218_PROTECT_L1);
}
static int tps65218_pmic_set_suspend_enable(struct regulator_dev *dev)
{
struct tps65218 *tps = rdev_get_drvdata(dev);
unsigned int rid = rdev_get_id(dev);
if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
return -EINVAL;
return tps65218_clear_bits(tps, dev->desc->bypass_reg,
dev->desc->bypass_mask,
TPS65218_PROTECT_L1);
}
static int tps65218_pmic_set_suspend_disable(struct regulator_dev *dev)
{
struct tps65218 *tps = rdev_get_drvdata(dev);
unsigned int rid = rdev_get_id(dev);
if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
return -EINVAL;
if (!tps->info[rid]->strobe)
return -EINVAL;
return tps65218_set_bits(tps, dev->desc->bypass_reg,
dev->desc->bypass_mask,
tps->info[rid]->strobe,
TPS65218_PROTECT_L1);
}
/* Operations permitted on DCDC1, DCDC2 */
static struct regulator_ops tps65218_dcdc12_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = tps65218_pmic_enable,
.disable = tps65218_pmic_disable,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = tps65218_pmic_set_voltage_sel,
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_suspend_enable = tps65218_pmic_set_suspend_enable,
.set_suspend_disable = tps65218_pmic_set_suspend_disable,
};
/* Operations permitted on DCDC3, DCDC4 and LDO1 */
static struct regulator_ops tps65218_ldo1_dcdc34_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = tps65218_pmic_enable,
.disable = tps65218_pmic_disable,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = tps65218_pmic_set_voltage_sel,
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.set_suspend_enable = tps65218_pmic_set_suspend_enable,
.set_suspend_disable = tps65218_pmic_set_suspend_disable,
};
static const int ls3_currents[] = { 100, 200, 500, 1000 };
static int tps65218_pmic_set_input_current_lim(struct regulator_dev *dev,
int lim_uA)
{
unsigned int index = 0;
unsigned int num_currents = ARRAY_SIZE(ls3_currents);
struct tps65218 *tps = rdev_get_drvdata(dev);
while (index < num_currents && ls3_currents[index] != lim_uA)
index++;
if (index == num_currents)
return -EINVAL;
return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
index << 2, TPS65218_PROTECT_L1);
}
static int tps65218_pmic_set_current_limit(struct regulator_dev *dev,
int min_uA, int max_uA)
{
int index = 0;
unsigned int num_currents = ARRAY_SIZE(ls3_currents);
struct tps65218 *tps = rdev_get_drvdata(dev);
while (index < num_currents && ls3_currents[index] < max_uA)
index++;
index--;
if (index < 0 || ls3_currents[index] < min_uA)
return -EINVAL;
return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
index << 2, TPS65218_PROTECT_L1);
}
static int tps65218_pmic_get_current_limit(struct regulator_dev *dev)
{
int retval;
unsigned int index;
struct tps65218 *tps = rdev_get_drvdata(dev);
retval = tps65218_reg_read(tps, dev->desc->csel_reg, &index);
if (retval < 0)
return retval;
index = (index & dev->desc->csel_mask) >> 2;
return ls3_currents[index];
}
static struct regulator_ops tps65218_ls3_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = tps65218_pmic_enable,
.disable = tps65218_pmic_disable,
.set_input_current_limit = tps65218_pmic_set_input_current_lim,
.set_current_limit = tps65218_pmic_set_current_limit,
.get_current_limit = tps65218_pmic_get_current_limit,
};
/* Operations permitted on DCDC5, DCDC6 */
static struct regulator_ops tps65218_dcdc56_pmic_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = tps65218_pmic_enable,
.disable = tps65218_pmic_disable,
.set_suspend_enable = tps65218_pmic_set_suspend_enable,
.set_suspend_disable = tps65218_pmic_set_suspend_disable,
};
static const struct regulator_desc regulators[] = {
TPS65218_REGULATOR("DCDC1", TPS65218_DCDC_1, REGULATOR_VOLTAGE,
tps65218_dcdc12_ops, 64, TPS65218_REG_CONTROL_DCDC1,
TPS65218_CONTROL_DCDC1_MASK, TPS65218_REG_ENABLE1,
TPS65218_ENABLE1_DC1_EN, 0, 0, dcdc1_dcdc2_ranges,
2, 4000, 0, TPS65218_REG_SEQ3,
TPS65218_SEQ3_DC1_SEQ_MASK),
TPS65218_REGULATOR("DCDC2", TPS65218_DCDC_2, REGULATOR_VOLTAGE,
tps65218_dcdc12_ops, 64, TPS65218_REG_CONTROL_DCDC2,
TPS65218_CONTROL_DCDC2_MASK, TPS65218_REG_ENABLE1,
TPS65218_ENABLE1_DC2_EN, 0, 0, dcdc1_dcdc2_ranges,
2, 4000, 0, TPS65218_REG_SEQ3,
TPS65218_SEQ3_DC2_SEQ_MASK),
TPS65218_REGULATOR("DCDC3", TPS65218_DCDC_3, REGULATOR_VOLTAGE,
tps65218_ldo1_dcdc34_ops, 64,
TPS65218_REG_CONTROL_DCDC3,
TPS65218_CONTROL_DCDC3_MASK, TPS65218_REG_ENABLE1,
TPS65218_ENABLE1_DC3_EN, 0, 0, ldo1_dcdc3_ranges, 2,
0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC3_SEQ_MASK),
TPS65218_REGULATOR("DCDC4", TPS65218_DCDC_4, REGULATOR_VOLTAGE,
tps65218_ldo1_dcdc34_ops, 53,
TPS65218_REG_CONTROL_DCDC4,
TPS65218_CONTROL_DCDC4_MASK, TPS65218_REG_ENABLE1,
TPS65218_ENABLE1_DC4_EN, 0, 0, dcdc4_ranges, 2,
0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC4_SEQ_MASK),
TPS65218_REGULATOR("DCDC5", TPS65218_DCDC_5, REGULATOR_VOLTAGE,
tps65218_dcdc56_pmic_ops, 1, -1, -1,
TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC5_EN, 0, 0,
NULL, 0, 0, 1000000, TPS65218_REG_SEQ5,
TPS65218_SEQ5_DC5_SEQ_MASK),
TPS65218_REGULATOR("DCDC6", TPS65218_DCDC_6, REGULATOR_VOLTAGE,
tps65218_dcdc56_pmic_ops, 1, -1, -1,
TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC6_EN, 0, 0,
NULL, 0, 0, 1800000, TPS65218_REG_SEQ5,
TPS65218_SEQ5_DC6_SEQ_MASK),
TPS65218_REGULATOR("LDO1", TPS65218_LDO_1, REGULATOR_VOLTAGE,
tps65218_ldo1_dcdc34_ops, 64,
TPS65218_REG_CONTROL_LDO1,
TPS65218_CONTROL_LDO1_MASK, TPS65218_REG_ENABLE2,
TPS65218_ENABLE2_LDO1_EN, 0, 0, ldo1_dcdc3_ranges,
2, 0, 0, TPS65218_REG_SEQ6,
TPS65218_SEQ6_LDO1_SEQ_MASK),
TPS65218_REGULATOR("LS3", TPS65218_LS_3, REGULATOR_CURRENT,
tps65218_ls3_ops, 0, 0, 0, TPS65218_REG_ENABLE2,
TPS65218_ENABLE2_LS3_EN, TPS65218_REG_CONFIG2,
TPS65218_CONFIG2_LS3ILIM_MASK, NULL, 0, 0, 0, 0, 0),
};
static int tps65218_regulator_probe(struct platform_device *pdev)
{
struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
struct regulator_init_data *init_data;
const struct tps_info *template;
struct regulator_dev *rdev;
const struct of_device_id *match;
struct regulator_config config = { };
int id, ret;
unsigned int val;
match = of_match_device(tps65218_of_match, &pdev->dev);
if (!match)
return -ENODEV;
template = match->data;
id = template->id;
init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
&regulators[id]);
platform_set_drvdata(pdev, tps);
tps->info[id] = &tps65218_pmic_regs[id];
config.dev = &pdev->dev;
config.init_data = init_data;
config.driver_data = tps;
config.regmap = tps->regmap;
config.of_node = pdev->dev.of_node;
rdev = devm_regulator_register(&pdev->dev, &regulators[id], &config);
if (IS_ERR(rdev)) {
dev_err(tps->dev, "failed to register %s regulator\n",
pdev->name);
return PTR_ERR(rdev);
}
ret = tps65218_reg_read(tps, regulators[id].bypass_reg, &val);
if (ret)
return ret;
tps->info[id]->strobe = val & regulators[id].bypass_mask;
return 0;
}
static struct platform_driver tps65218_regulator_driver = {
.driver = {
.name = "tps65218-pmic",
.of_match_table = tps65218_of_match,
},
.probe = tps65218_regulator_probe,
};
module_platform_driver(tps65218_regulator_driver);
MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
MODULE_DESCRIPTION("TPS65218 voltage regulator driver");
MODULE_ALIAS("platform:tps65218-pmic");
MODULE_LICENSE("GPL v2");
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