blob: 222ecd1d2a402ac830685413511b805c77145d7b [file] [log] [blame]
/*
* Device driver for regulators in Hi6421 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/hi6421-pmic.h>
#include <linux/delay.h>
#include <linux/time.h>
struct hi6421_regulator_register_info {
u32 ctrl_reg;
u32 enable_mask;
u32 eco_mode_mask;
u32 vset_reg;
u32 vset_mask;
};
struct hi6421_regulator {
const char *name;
struct hi6421_regulator_register_info register_info;
struct timeval last_off_time;
u32 off_on_delay;
u32 eco_uA;
struct regulator_desc rdesc;
int (*dt_parse)(struct hi6421_regulator *, struct platform_device *);
};
static inline struct hi6421_pmic *rdev_to_pmic(struct regulator_dev *dev)
{
/* regulator_dev parent to->
* hi6421 regulator platform device_dev parent to->
* hi6421 pmic platform device_dev
*/
return dev_get_drvdata(rdev_get_dev(dev)->parent->parent);
}
/* helper function to ensure when it returns it is at least 'delay_us'
* microseconds after 'since'.
*/
static void ensured_time_after(struct timeval since, u32 delay_us)
{
struct timeval now;
u64 elapsed_ns64, delay_ns64;
u32 actual_us32;
delay_ns64 = delay_us * NSEC_PER_USEC;
do_gettimeofday(&now);
elapsed_ns64 = timeval_to_ns(&now) - timeval_to_ns(&since);
if (delay_ns64 > elapsed_ns64) {
actual_us32 = ((u32)(delay_ns64 - elapsed_ns64) /
NSEC_PER_USEC);
if (actual_us32 >= 1000) {
mdelay(actual_us32 / 1000);
udelay(actual_us32 % 1000);
} else if (actual_us32 > 0) {
udelay(actual_us32);
}
}
return;
}
static int hi6421_regulator_is_enabled(struct regulator_dev *dev)
{
u32 reg_val;
struct hi6421_regulator *sreg = rdev_get_drvdata(dev);
struct hi6421_pmic *pmic = rdev_to_pmic(dev);
reg_val = hi6421_pmic_read(pmic, sreg->register_info.ctrl_reg);
return ((reg_val & sreg->register_info.enable_mask) != 0);
}
static int hi6421_regulator_enable(struct regulator_dev *dev)
{
struct hi6421_regulator *sreg = rdev_get_drvdata(dev);
struct hi6421_pmic *pmic = rdev_to_pmic(dev);
/* keep a distance of off_on_delay from last time disabled */
ensured_time_after(sreg->last_off_time, sreg->off_on_delay);
/* cannot enable more than one regulator at one time */
mutex_lock(&pmic->enable_mutex);
ensured_time_after(pmic->last_enabled, HI6421_REGS_ENA_PROTECT_TIME);
/* set enable register */
hi6421_pmic_rmw(pmic, sreg->register_info.ctrl_reg,
sreg->register_info.enable_mask,
sreg->register_info.enable_mask);
do_gettimeofday(&pmic->last_enabled);
mutex_unlock(&pmic->enable_mutex);
return 0;
}
static int hi6421_regulator_disable(struct regulator_dev *dev)
{
struct hi6421_regulator *sreg = rdev_get_drvdata(dev);
struct hi6421_pmic *pmic = rdev_to_pmic(dev);
/* set enable register to 0 */
hi6421_pmic_rmw(pmic, sreg->register_info.ctrl_reg,
sreg->register_info.enable_mask, 0);
do_gettimeofday(&sreg->last_off_time);
return 0;
}
static int hi6421_regulator_get_voltage(struct regulator_dev *dev)
{
struct hi6421_regulator *sreg = rdev_get_drvdata(dev);
struct hi6421_pmic *pmic = rdev_to_pmic(dev);
u32 reg_val, selector;
/* get voltage selector */
reg_val = hi6421_pmic_read(pmic, sreg->register_info.vset_reg);
selector = (reg_val & sreg->register_info.vset_mask) >>
(ffs(sreg->register_info.vset_mask) - 1);
return sreg->rdesc.ops->list_voltage(dev, selector);
}
static int hi6421_regulator_ldo_set_voltage(struct regulator_dev *dev,
int min_uV, int max_uV, unsigned *selector)
{
struct hi6421_regulator *sreg = rdev_get_drvdata(dev);
struct hi6421_pmic *pmic = rdev_to_pmic(dev);
u32 vsel;
int ret = 0;
for (vsel = 0; vsel < sreg->rdesc.n_voltages; vsel++) {
int uV = sreg->rdesc.volt_table[vsel];
/* Break at the first in-range value */
if (min_uV <= uV && uV <= max_uV)
break;
}
/* unlikely to happen. sanity test done by regulator core */
if (unlikely(vsel == sreg->rdesc.n_voltages))
return -EINVAL;
*selector = vsel;
/* set voltage selector */
hi6421_pmic_rmw(pmic, sreg->register_info.vset_reg,
sreg->register_info.vset_mask,
vsel << (ffs(sreg->register_info.vset_mask) - 1));
return ret;
}
static int hi6421_regulator_buck012_set_voltage(struct regulator_dev *dev,
int min_uV, int max_uV, unsigned *selector)
{
struct hi6421_regulator *sreg = rdev_get_drvdata(dev);
struct hi6421_pmic *pmic = rdev_to_pmic(dev);
u32 vsel;
int ret = 0;
vsel = DIV_ROUND_UP((max_uV - sreg->rdesc.min_uV),
sreg->rdesc.uV_step);
*selector = vsel;
/* set voltage selector */
hi6421_pmic_rmw(pmic, sreg->register_info.vset_reg,
sreg->register_info.vset_mask,
vsel << (ffs(sreg->register_info.vset_mask) - 1));
return ret;
}
static unsigned int hi6421_regulator_get_mode(struct regulator_dev *dev)
{
struct hi6421_regulator *sreg = rdev_get_drvdata(dev);
struct hi6421_pmic *pmic = rdev_to_pmic(dev);
u32 reg_val;
reg_val = hi6421_pmic_read(pmic, sreg->register_info.ctrl_reg);
if (reg_val & sreg->register_info.eco_mode_mask)
return REGULATOR_MODE_IDLE;
else
return REGULATOR_MODE_NORMAL;
}
static int hi6421_regulator_set_mode(struct regulator_dev *dev,
unsigned int mode)
{
struct hi6421_regulator *sreg = rdev_get_drvdata(dev);
struct hi6421_pmic *pmic = rdev_to_pmic(dev);
u32 eco_mode;
switch (mode) {
case REGULATOR_MODE_NORMAL:
eco_mode = HI6421_ECO_MODE_DISABLE;
break;
case REGULATOR_MODE_IDLE:
eco_mode = HI6421_ECO_MODE_ENABLE;
break;
default:
return -EINVAL;
}
/* set mode */
hi6421_pmic_rmw(pmic, sreg->register_info.ctrl_reg,
sreg->register_info.eco_mode_mask,
eco_mode << (ffs(sreg->register_info.eco_mode_mask) - 1));
return 0;
}
unsigned int hi6421_regulator_get_optimum_mode(struct regulator_dev *dev,
int input_uV, int output_uV, int load_uA)
{
struct hi6421_regulator *sreg = rdev_get_drvdata(dev);
if ((load_uA == 0) || (load_uA > sreg->eco_uA))
return REGULATOR_MODE_NORMAL;
else
return REGULATOR_MODE_IDLE;
}
static int hi6421_dt_parse_common(struct hi6421_regulator *sreg,
struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct regulator_desc *rdesc = &sreg->rdesc;
unsigned int register_info[3];
int ret = 0;
/* parse .register_info.ctrl_reg */
ret = of_property_read_u32_array(np, "hisilicon,hi6421-ctrl",
register_info, 3);
if (ret) {
dev_err(dev, "no hisilicon,hi6421-ctrl property set\n");
goto dt_parse_common_end;
}
sreg->register_info.ctrl_reg = register_info[0];
sreg->register_info.enable_mask = register_info[1];
sreg->register_info.eco_mode_mask = register_info[2];
/* parse .register_info.vset_reg */
ret = of_property_read_u32_array(np, "hisilicon,hi6421-vset",
register_info, 2);
if (ret) {
dev_err(dev, "no hisilicon,hi6421-vset property set\n");
goto dt_parse_common_end;
}
sreg->register_info.vset_reg = register_info[0];
sreg->register_info.vset_mask = register_info[1];
/* parse .off-on-delay */
ret = of_property_read_u32(np, "hisilicon,hi6421-off-on-delay-us",
&sreg->off_on_delay);
if (ret) {
dev_err(dev, "no hisilicon,hi6421-off-on-delay-us property set\n");
goto dt_parse_common_end;
}
/* parse .enable_time */
ret = of_property_read_u32(np, "hisilicon,hi6421-enable-time-us",
&rdesc->enable_time);
if (ret) {
dev_err(dev, "no hisilicon,hi6421-enable-time-us property set\n");
goto dt_parse_common_end;
}
/* parse .eco_uA */
ret = of_property_read_u32(np, "hisilicon,hi6421-eco-microamp",
&sreg->eco_uA);
if (ret) {
sreg->eco_uA = 0;
ret = 0;
}
dt_parse_common_end:
return ret;
}
static int hi6421_dt_parse_ldo(struct hi6421_regulator *sreg,
struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct regulator_desc *rdesc = &sreg->rdesc;
unsigned int *v_table;
int ret = 0;
/* parse .n_voltages, and .volt_table */
ret = of_property_read_u32(np, "hisilicon,hi6421-n-voltages",
&rdesc->n_voltages);
if (ret) {
dev_err(dev, "no hisilicon,hi6421-n-voltages property set\n");
goto dt_parse_ldo_end;
}
/* alloc space for .volt_table */
v_table = devm_kzalloc(dev, sizeof(unsigned int) * rdesc->n_voltages,
GFP_KERNEL);
if (unlikely(!v_table)) {
ret = -ENOMEM;
dev_err(dev, "no memory for .volt_table\n");
goto dt_parse_ldo_end;
}
ret = of_property_read_u32_array(np, "hisilicon,hi6421-vset-table",
v_table, rdesc->n_voltages);
if (ret) {
dev_err(dev, "no hisilicon,hi6421-vset-table property set\n");
goto dt_parse_ldo_end;
}
rdesc->volt_table = v_table;
/* parse hi6421 regulator's dt common part */
ret = hi6421_dt_parse_common(sreg, pdev);
if (ret) {
dev_err(dev, "failure in hi6421_dt_parse_common\n");
goto dt_parse_ldo_end;
}
dt_parse_ldo_end:
return ret;
}
static int hi6421_dt_parse_buck012(struct hi6421_regulator *sreg,
struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct regulator_desc *rdesc = &sreg->rdesc;
int ret = 0;
/* parse .n_voltages, and .uV_step */
ret = of_property_read_u32(np, "hisilicon,hi6421-n-voltages",
&rdesc->n_voltages);
if (ret) {
dev_err(dev, "no hisilicon,hi6421-n-voltages property set\n");
goto dt_parse_buck012_end;
}
ret = of_property_read_u32(np, "hisilicon,hi6421-uv-step",
&rdesc->uV_step);
if (ret) {
dev_err(dev, "no hisilicon,hi6421-uv-step property set\n");
goto dt_parse_buck012_end;
}
/* parse hi6421 regulator's dt common part */
ret = hi6421_dt_parse_common(sreg, pdev);
if (ret) {
dev_err(dev, "failure in hi6421_dt_parse_common\n");
goto dt_parse_buck012_end;
}
dt_parse_buck012_end:
return ret;
}
static struct regulator_ops hi6421_ldo_rops = {
.is_enabled = hi6421_regulator_is_enabled,
.enable = hi6421_regulator_enable,
.disable = hi6421_regulator_disable,
.list_voltage = regulator_list_voltage_table,
.get_voltage = hi6421_regulator_get_voltage,
.set_voltage = hi6421_regulator_ldo_set_voltage,
.get_mode = hi6421_regulator_get_mode,
.set_mode = hi6421_regulator_set_mode,
.get_optimum_mode = hi6421_regulator_get_optimum_mode,
};
static struct regulator_ops hi6421_buck012_rops = {
.is_enabled = hi6421_regulator_is_enabled,
.enable = hi6421_regulator_enable,
.disable = hi6421_regulator_disable,
.list_voltage = regulator_list_voltage_linear,
.get_voltage = hi6421_regulator_get_voltage,
.set_voltage = hi6421_regulator_buck012_set_voltage,
.get_mode = hi6421_regulator_get_mode,
.set_mode = hi6421_regulator_set_mode,
.get_optimum_mode = hi6421_regulator_get_optimum_mode,
};
static struct regulator_ops hi6421_buck345_rops = {
.is_enabled = hi6421_regulator_is_enabled,
.enable = hi6421_regulator_enable,
.disable = hi6421_regulator_disable,
.list_voltage = regulator_list_voltage_table,
.get_voltage = hi6421_regulator_get_voltage,
.set_voltage = hi6421_regulator_ldo_set_voltage,
.get_mode = hi6421_regulator_get_mode,
.set_mode = hi6421_regulator_set_mode,
.get_optimum_mode = hi6421_regulator_get_optimum_mode,
};
static const struct hi6421_regulator hi6421_regulator_ldo = {
.rdesc = {
.ops = &hi6421_ldo_rops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.dt_parse = hi6421_dt_parse_ldo,
};
static const struct hi6421_regulator hi6421_regulator_buck012 = {
.rdesc = {
.ops = &hi6421_buck012_rops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.dt_parse = hi6421_dt_parse_buck012,
};
static const struct hi6421_regulator hi6421_regulator_buck345 = {
.rdesc = {
.ops = &hi6421_buck345_rops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.dt_parse = hi6421_dt_parse_ldo,
};
static struct of_device_id of_hi6421_regulator_match_tbl[] = {
{
.compatible = "hisilicon,hi6421-ldo",
.data = &hi6421_regulator_ldo,
},
{
.compatible = "hisilicon,hi6421-buck012",
.data = &hi6421_regulator_buck012,
},
{
.compatible = "hisilicon,hi6421-buck345",
.data = &hi6421_regulator_buck345,
},
{ /* end */ }
};
static int hi6421_regulator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct regulator_desc *rdesc;
struct regulator_dev *rdev;
struct hi6421_regulator *sreg = NULL;
struct regulator_init_data *initdata;
struct regulation_constraints *c;
struct regulator_config config = { };
const struct of_device_id *match;
const struct hi6421_regulator *template = NULL;
int ret = 0;
/* to check which type of regulator this is */
match = of_match_device(of_hi6421_regulator_match_tbl, &pdev->dev);
if (match)
template = match->data;
else
return -EINVAL;
initdata = of_get_regulator_init_data(dev, np);
/* hi6421 regulator supports two modes */
c = &initdata->constraints;
c->valid_modes_mask = REGULATOR_MODE_NORMAL | REGULATOR_MODE_IDLE;
c->valid_ops_mask |= (REGULATOR_CHANGE_MODE | REGULATOR_CHANGE_DRMS);
c->input_uV = c->min_uV;
sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
if (sreg == NULL)
return -ENOMEM;
memcpy(sreg, template, sizeof(*sreg));
sreg->name = initdata->constraints.name;
rdesc = &sreg->rdesc;
rdesc->name = sreg->name;
rdesc->min_uV = initdata->constraints.min_uV;
if (of_get_property(np, "ldo-supply", NULL)) {
rdesc->supply_name = "ldo";
}
/* to parse device tree data for regulator specific */
ret = sreg->dt_parse(sreg, pdev);
if (ret) {
dev_err(dev, "device tree parameter parse error!\n");
goto hi6421_probe_end;
}
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);
ret = PTR_ERR(rdev);
goto hi6421_probe_end;
}
platform_set_drvdata(pdev, rdev);
hi6421_probe_end:
return ret;
}
static int hi6421_regulator_remove(struct platform_device *pdev)
{
struct regulator_dev *rdev = platform_get_drvdata(pdev);
regulator_unregister(rdev);
return 0;
}
static struct platform_driver hi6421_regulator_driver = {
.driver = {
.name = "hi6421_regulator",
.owner = THIS_MODULE,
.of_match_table = of_hi6421_regulator_match_tbl,
},
.probe = hi6421_regulator_probe,
.remove = hi6421_regulator_remove,
};
module_platform_driver(hi6421_regulator_driver);
MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
MODULE_DESCRIPTION("Hi6421 regulator driver");
MODULE_LICENSE("GPL v2");