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/*
* Device driver for regulators in Hisi IC
*
* Copyright (c) 2013 Linaro Ltd.
* Copyright (c) 2011 Hisilicon.
*
* Guodong Xu <guodong.xu@linaro.org>
*
* 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 in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/mfd/hi6421-spmi-pmic.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of.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/seq_file.h>
#include <linux/slab.h>
#include <linux/spmi.h>
#include <linux/time.h>
#include <linux/uaccess.h>
#define rdev_dbg(rdev, fmt, arg...) \
pr_debug("%s: %s: " fmt, (rdev)->desc->name, __func__, ##arg)
struct hi6421v600_regulator {
struct regulator_desc rdesc;
struct hi6421_spmi_pmic *pmic;
u32 eco_mode_mask, eco_uA;
};
static DEFINE_MUTEX(enable_mutex);
/*
* helper function to ensure when it returns it is at least 'delay_us'
* microseconds after 'since'.
*/
static int hi6421_spmi_regulator_is_enabled(struct regulator_dev *rdev)
{
struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
struct hi6421_spmi_pmic *pmic = sreg->pmic;
u32 reg_val;
reg_val = hi6421_spmi_pmic_read(pmic, rdev->desc->enable_reg);
rdev_dbg(rdev,
"enable_reg=0x%x, val= 0x%x, enable_state=%d\n",
rdev->desc->enable_reg,
reg_val, (reg_val & rdev->desc->enable_mask));
return ((reg_val & rdev->desc->enable_mask) != 0);
}
static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
{
struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
struct hi6421_spmi_pmic *pmic = sreg->pmic;
/* cannot enable more than one regulator at one time */
mutex_lock(&enable_mutex);
usleep_range(HISI_REGS_ENA_PROTECT_TIME,
HISI_REGS_ENA_PROTECT_TIME + 1000);
/* set enable register */
rdev_dbg(rdev,
"off_on_delay=%d us, enable_reg=0x%x, enable_mask=0x%x\n",
rdev->desc->off_on_delay, rdev->desc->enable_reg,
rdev->desc->enable_mask);
hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
rdev->desc->enable_mask,
rdev->desc->enable_mask);
mutex_unlock(&enable_mutex);
return 0;
}
static int hi6421_spmi_regulator_disable(struct regulator_dev *rdev)
{
struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
struct hi6421_spmi_pmic *pmic = sreg->pmic;
/* set enable register to 0 */
rdev_dbg(rdev, "enable_reg=0x%x, enable_mask=0x%x\n",
rdev->desc->enable_reg, rdev->desc->enable_mask);
hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
rdev->desc->enable_mask, 0);
return 0;
}
static int hi6421_spmi_regulator_get_voltage_sel(struct regulator_dev *rdev)
{
struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
struct hi6421_spmi_pmic *pmic = sreg->pmic;
u32 reg_val, selector;
/* get voltage selector */
reg_val = hi6421_spmi_pmic_read(pmic, rdev->desc->vsel_reg);
selector = (reg_val & rdev->desc->vsel_mask) >> (ffs(rdev->desc->vsel_mask) - 1);
rdev_dbg(rdev,
"vsel_reg=0x%x, value=0x%x, entry=0x%x, voltage=%d mV\n",
rdev->desc->vsel_reg, reg_val, selector,
rdev->desc->ops->list_voltage(rdev, selector) / 1000);
return selector;
}
static int hi6421_spmi_regulator_set_voltage_sel(struct regulator_dev *rdev,
unsigned int selector)
{
struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
struct hi6421_spmi_pmic *pmic = sreg->pmic;
u32 reg_val;
if (unlikely(selector >= rdev->desc->n_voltages))
return -EINVAL;
reg_val = selector << (ffs(rdev->desc->vsel_mask) - 1);
/* set voltage selector */
rdev_dbg(rdev,
"vsel_reg=0x%x, mask=0x%x, value=0x%x, voltage=%d mV\n",
rdev->desc->vsel_reg, rdev->desc->vsel_mask, reg_val,
rdev->desc->ops->list_voltage(rdev, selector) / 1000);
hi6421_spmi_pmic_rmw(pmic, rdev->desc->vsel_reg,
rdev->desc->vsel_mask, reg_val);
return 0;
}
static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
{
struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
struct hi6421_spmi_pmic *pmic = sreg->pmic;
unsigned int mode;
u32 reg_val;
reg_val = hi6421_spmi_pmic_read(pmic, rdev->desc->enable_reg);
if (reg_val & sreg->eco_mode_mask)
mode = REGULATOR_MODE_IDLE;
else
mode = REGULATOR_MODE_NORMAL;
rdev_dbg(rdev,
"enable_reg=0x%x, eco_mode_mask=0x%x, reg_val=0x%x, %s mode\n",
rdev->desc->enable_reg, sreg->eco_mode_mask, reg_val,
mode == REGULATOR_MODE_IDLE ? "idle" : "normal");
return mode;
}
static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
struct hi6421_spmi_pmic *pmic = sreg->pmic;
u32 val;
switch (mode) {
case REGULATOR_MODE_NORMAL:
val = 0;
break;
case REGULATOR_MODE_IDLE:
val = sreg->eco_mode_mask << (ffs(sreg->eco_mode_mask) - 1);
break;
default:
return -EINVAL;
}
/* set mode */
rdev_dbg(rdev, "enable_reg=0x%x, eco_mode_mask=0x%x, value=0x%x\n",
rdev->desc->enable_reg, sreg->eco_mode_mask, val);
hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
sreg->eco_mode_mask, val);
return 0;
}
static unsigned int
hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
int input_uV, int output_uV,
int load_uA)
{
struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
if (load_uA || ((unsigned int)load_uA > sreg->eco_uA))
return REGULATOR_MODE_NORMAL;
return REGULATOR_MODE_IDLE;
}
static int hi6421_spmi_dt_parse(struct platform_device *pdev,
struct hi6421v600_regulator *sreg,
struct regulator_desc *rdesc)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
unsigned int *v_table;
int ret;
ret = of_property_read_u32(np, "reg", &rdesc->enable_reg);
if (ret) {
dev_err(dev, "missing reg property\n");
return ret;
}
ret = of_property_read_u32(np, "vsel-reg", &rdesc->vsel_reg);
if (ret) {
dev_err(dev, "missing vsel-reg property\n");
return ret;
}
ret = of_property_read_u32(np, "enable-mask", &rdesc->enable_mask);
if (ret) {
dev_err(dev, "missing enable-mask property\n");
return ret;
}
/*
* Not all regulators work on idle mode
*/
ret = of_property_read_u32(np, "idle-mode-mask", &sreg->eco_mode_mask);
if (ret) {
dev_dbg(dev, "LDO doesn't support economy mode.\n");
sreg->eco_mode_mask = 0;
sreg->eco_uA = 0;
} else {
ret = of_property_read_u32(np, "eco-microamp", &sreg->eco_uA);
if (ret) {
dev_err(dev, "missing eco-microamp property\n");
return ret;
}
}
/* parse .off-on-delay */
ret = of_property_read_u32(np, "off-on-delay-us",
&rdesc->off_on_delay);
if (ret) {
dev_err(dev, "missing off-on-delay-us property\n");
return ret;
}
/* parse .enable_time */
ret = of_property_read_u32(np, "startup-delay-us",
&rdesc->enable_time);
if (ret) {
dev_err(dev, "missing startup-delay-us property\n");
return ret;
}
/* FIXME: are there a better value for this? */
rdesc->ramp_delay = rdesc->enable_time;
/* parse volt_table */
rdesc->n_voltages = of_property_count_u32_elems(np, "voltage-table");
v_table = devm_kzalloc(dev, sizeof(unsigned int) * rdesc->n_voltages,
GFP_KERNEL);
if (unlikely(!v_table))
return -ENOMEM;
rdesc->volt_table = v_table;
ret = of_property_read_u32_array(np, "voltage-table",
v_table, rdesc->n_voltages);
if (ret) {
dev_err(dev, "missing voltage-table property\n");
return ret;
}
/*
* Instead of explicitly requiring a mask for the voltage selector,
* as they all start from bit zero (at least on the known LDOs),
* just use the number of voltages at the voltage table, getting the
* minimal mask that would pick everything.
*/
rdesc->vsel_mask = (1 << (fls(rdesc->n_voltages) - 1)) - 1;
dev_dbg(dev, "voltage selector settings: reg: 0x%x, mask: 0x%x\n",
rdesc->vsel_reg, rdesc->vsel_mask);
return 0;
}
static const struct regulator_ops hi6421_spmi_ldo_rops = {
.is_enabled = hi6421_spmi_regulator_is_enabled,
.enable = hi6421_spmi_regulator_enable,
.disable = hi6421_spmi_regulator_disable,
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_iterate,
.get_voltage_sel = hi6421_spmi_regulator_get_voltage_sel,
.set_voltage_sel = hi6421_spmi_regulator_set_voltage_sel,
.get_mode = hi6421_spmi_regulator_get_mode,
.set_mode = hi6421_spmi_regulator_set_mode,
.get_optimum_mode = hi6421_spmi_regulator_get_optimum_mode,
};
static int hi6421_spmi_regulator_probe_ldo(struct platform_device *pdev,
struct device_node *np,
struct hi6421_spmi_pmic *pmic)
{
struct regulation_constraints *constraint;
struct regulator_init_data *initdata;
struct regulator_config config = { };
struct hi6421v600_regulator *sreg;
struct device *dev = &pdev->dev;
struct regulator_desc *rdesc;
struct regulator_dev *rdev;
const char *supplyname;
int ret;
initdata = of_get_regulator_init_data(dev, np, NULL);
if (!initdata) {
dev_err(dev, "failed to get regulator data\n");
return -EINVAL;
}
sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
if (!sreg)
return -ENOMEM;
sreg->pmic = pmic;
rdesc = &sreg->rdesc;
rdesc->name = initdata->constraints.name;
rdesc->ops = &hi6421_spmi_ldo_rops;
rdesc->type = REGULATOR_VOLTAGE;
rdesc->min_uV = initdata->constraints.min_uV;
supplyname = of_get_property(np, "supply_name", NULL);
if (supplyname)
initdata->supply_regulator = supplyname;
/* parse device tree data for regulator specific */
ret = hi6421_spmi_dt_parse(pdev, sreg, rdesc);
if (ret)
return ret;
/* hisi regulator supports two modes */
constraint = &initdata->constraints;
constraint->valid_modes_mask = REGULATOR_MODE_NORMAL;
if (sreg->eco_mode_mask) {
constraint->valid_modes_mask |= REGULATOR_MODE_IDLE;
constraint->valid_ops_mask |= REGULATOR_CHANGE_MODE;
}
config.dev = &pdev->dev;
config.init_data = initdata;
config.driver_data = sreg;
config.of_node = pdev->dev.of_node;
/* register regulator */
rdev = regulator_register(rdesc, &config);
if (IS_ERR(rdev)) {
dev_err(dev, "failed to register %s\n",
rdesc->name);
return PTR_ERR(rdev);
}
rdev_dbg(rdev, "valid_modes_mask: 0x%x, valid_ops_mask: 0x%x\n",
constraint->valid_modes_mask, constraint->valid_ops_mask);
dev_set_drvdata(dev, rdev);
return 0;
}
static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
{
struct device *pmic_dev = pdev->dev.parent;
struct device_node *np = pmic_dev->of_node;
struct device_node *regulators, *child;
struct platform_device *new_pdev;
struct hi6421_spmi_pmic *pmic;
int ret;
/*
* This driver is meant to be called by hi6421-spmi-core,
* which should first set drvdata. If this doesn't happen, hit
* a warn on and return.
*/
pmic = dev_get_drvdata(pmic_dev);
if (WARN_ON(!pmic))
return -ENODEV;
regulators = of_get_child_by_name(np, "regulators");
if (!regulators) {
dev_err(&pdev->dev, "regulator node not found\n");
return -ENODEV;
}
/*
* Parse all LDO regulator nodes
*/
for_each_child_of_node(regulators, child) {
dev_dbg(&pdev->dev, "adding child %pOF\n", child);
new_pdev = platform_device_alloc(child->name, -1);
new_pdev->dev.parent = pmic_dev;
new_pdev->dev.of_node = of_node_get(child);
ret = platform_device_add(new_pdev);
if (ret < 0) {
platform_device_put(new_pdev);
continue;
}
ret = hi6421_spmi_regulator_probe_ldo(new_pdev, child, pmic);
if (ret < 0)
platform_device_put(new_pdev);
}
of_node_put(regulators);
return 0;
}
static int hi6421_spmi_regulator_remove(struct platform_device *pdev)
{
struct regulator_dev *rdev = dev_get_drvdata(&pdev->dev);
struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
regulator_unregister(rdev);
if (rdev->desc->volt_table)
devm_kfree(&pdev->dev, (unsigned int *)rdev->desc->volt_table);
kfree(sreg);
return 0;
}
static const struct platform_device_id hi6421v600_regulator_table[] = {
{ .name = "hi6421v600-regulator" },
{},
};
MODULE_DEVICE_TABLE(platform, hi6421v600_regulator_table);
static struct platform_driver hi6421v600_regulator_driver = {
.id_table = hi6421v600_regulator_table,
.driver = {
.name = "hi6421v600-regulator",
},
.probe = hi6421_spmi_regulator_probe,
.remove = hi6421_spmi_regulator_remove,
};
module_platform_driver(hi6421v600_regulator_driver);
MODULE_DESCRIPTION("Hi6421v600 regulator driver");
MODULE_LICENSE("GPL v2");
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