358 lines
8.7 KiB
C
358 lines
8.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* ROHM BD9571MWV-M regulator driver
|
|
*
|
|
* Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
|
|
*
|
|
* Based on the TPS65086 driver
|
|
*
|
|
* NOTE: VD09 is missing
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regulator/driver.h>
|
|
|
|
#include <linux/mfd/bd9571mwv.h>
|
|
|
|
struct bd9571mwv_reg {
|
|
struct bd9571mwv *bd;
|
|
|
|
/* DDR Backup Power */
|
|
u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */
|
|
u8 bkup_mode_cnt_saved;
|
|
bool bkup_mode_enabled;
|
|
|
|
/* Power switch type */
|
|
bool rstbmode_level;
|
|
bool rstbmode_pulse;
|
|
};
|
|
|
|
enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };
|
|
|
|
#define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
|
|
{ \
|
|
.name = _name, \
|
|
.of_match = of_match_ptr(_of), \
|
|
.regulators_node = "regulators", \
|
|
.id = _id, \
|
|
.ops = &_ops, \
|
|
.n_voltages = _nv, \
|
|
.type = REGULATOR_VOLTAGE, \
|
|
.owner = THIS_MODULE, \
|
|
.vsel_reg = _vr, \
|
|
.vsel_mask = _vm, \
|
|
.min_uV = _min, \
|
|
.uV_step = _step, \
|
|
.linear_min_sel = _lmin, \
|
|
}
|
|
|
|
static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
|
|
{
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
return val & BD9571MWV_AVS_SET_MONI_MASK;
|
|
}
|
|
|
|
static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
|
|
unsigned int sel)
|
|
{
|
|
int ret;
|
|
|
|
ret = bd9571mwv_avs_get_moni_state(rdev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
|
|
rdev->desc->vsel_mask, sel);
|
|
}
|
|
|
|
static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
|
|
{
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = bd9571mwv_avs_get_moni_state(rdev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
val &= rdev->desc->vsel_mask;
|
|
val >>= ffs(rdev->desc->vsel_mask) - 1;
|
|
|
|
return val;
|
|
}
|
|
|
|
static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
|
|
unsigned int sel)
|
|
{
|
|
return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
|
|
rdev->desc->vsel_mask, sel);
|
|
}
|
|
|
|
/* Operations permitted on AVS voltage regulator */
|
|
static const struct regulator_ops avs_ops = {
|
|
.set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap,
|
|
.map_voltage = regulator_map_voltage_linear,
|
|
.get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap,
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
};
|
|
|
|
/* Operations permitted on voltage regulators */
|
|
static const struct regulator_ops reg_ops = {
|
|
.set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap,
|
|
.map_voltage = regulator_map_voltage_linear,
|
|
.get_voltage_sel = regulator_get_voltage_sel_regmap,
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
};
|
|
|
|
/* Operations permitted on voltage monitors */
|
|
static const struct regulator_ops vid_ops = {
|
|
.map_voltage = regulator_map_voltage_linear,
|
|
.get_voltage_sel = regulator_get_voltage_sel_regmap,
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
};
|
|
|
|
static const struct regulator_desc regulators[] = {
|
|
BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
|
|
0x6f, 600000, 10000, 0x3c),
|
|
BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
|
|
16, 1625000, 25000, 0),
|
|
BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
|
|
16, 2150000, 50000, 0),
|
|
BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
|
|
11, 2800000, 100000, 0),
|
|
BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
|
|
BD9571MWV_DVFS_MONIVDAC, 0x7f,
|
|
0x6f, 600000, 10000, 0x3c),
|
|
};
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int bd9571mwv_bkup_mode_read(struct bd9571mwv *bd, unsigned int *mode)
|
|
{
|
|
int ret;
|
|
|
|
ret = regmap_read(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
|
|
if (ret) {
|
|
dev_err(bd->dev, "failed to read backup mode (%d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode)
|
|
{
|
|
int ret;
|
|
|
|
ret = regmap_write(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
|
|
if (ret) {
|
|
dev_err(bd->dev, "failed to configure backup mode 0x%x (%d)\n",
|
|
mode, ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t backup_mode_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
|
|
}
|
|
|
|
static ssize_t backup_mode_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
|
|
unsigned int mode;
|
|
int ret;
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!bdreg->rstbmode_level)
|
|
return count;
|
|
|
|
/*
|
|
* Configure DDR Backup Mode, to change the role of the accessory power
|
|
* switch from a power switch to a wake-up switch, or vice versa
|
|
*/
|
|
ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
|
|
if (bdreg->bkup_mode_enabled)
|
|
mode |= bdreg->bkup_mode_cnt_keepon;
|
|
|
|
ret = bd9571mwv_bkup_mode_write(bdreg->bd, mode);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(backup_mode);
|
|
|
|
static int bd9571mwv_suspend(struct device *dev)
|
|
{
|
|
struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
|
|
unsigned int mode;
|
|
int ret;
|
|
|
|
if (!bdreg->bkup_mode_enabled)
|
|
return 0;
|
|
|
|
/* Save DDR Backup Mode */
|
|
ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
|
|
if (ret)
|
|
return ret;
|
|
|
|
bdreg->bkup_mode_cnt_saved = mode;
|
|
|
|
if (!bdreg->rstbmode_pulse)
|
|
return 0;
|
|
|
|
/* Enable DDR Backup Mode */
|
|
mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
|
|
mode |= bdreg->bkup_mode_cnt_keepon;
|
|
|
|
if (mode != bdreg->bkup_mode_cnt_saved)
|
|
return bd9571mwv_bkup_mode_write(bdreg->bd, mode);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bd9571mwv_resume(struct device *dev)
|
|
{
|
|
struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
|
|
|
|
if (!bdreg->bkup_mode_enabled)
|
|
return 0;
|
|
|
|
/* Restore DDR Backup Mode */
|
|
return bd9571mwv_bkup_mode_write(bdreg->bd, bdreg->bkup_mode_cnt_saved);
|
|
}
|
|
|
|
static const struct dev_pm_ops bd9571mwv_pm = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
|
|
};
|
|
|
|
static int bd9571mwv_regulator_remove(struct platform_device *pdev)
|
|
{
|
|
device_remove_file(&pdev->dev, &dev_attr_backup_mode);
|
|
return 0;
|
|
}
|
|
#define DEV_PM_OPS &bd9571mwv_pm
|
|
#else
|
|
#define DEV_PM_OPS NULL
|
|
#define bd9571mwv_regulator_remove NULL
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static int bd9571mwv_regulator_probe(struct platform_device *pdev)
|
|
{
|
|
struct bd9571mwv *bd = dev_get_drvdata(pdev->dev.parent);
|
|
struct regulator_config config = { };
|
|
struct bd9571mwv_reg *bdreg;
|
|
struct regulator_dev *rdev;
|
|
unsigned int val;
|
|
int i;
|
|
|
|
bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
|
|
if (!bdreg)
|
|
return -ENOMEM;
|
|
|
|
bdreg->bd = bd;
|
|
|
|
platform_set_drvdata(pdev, bdreg);
|
|
|
|
config.dev = &pdev->dev;
|
|
config.dev->of_node = bd->dev->of_node;
|
|
config.driver_data = bd;
|
|
config.regmap = bd->regmap;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(regulators); i++) {
|
|
rdev = devm_regulator_register(&pdev->dev, ®ulators[i],
|
|
&config);
|
|
if (IS_ERR(rdev)) {
|
|
dev_err(bd->dev, "failed to register %s regulator\n",
|
|
pdev->name);
|
|
return PTR_ERR(rdev);
|
|
}
|
|
}
|
|
|
|
val = 0;
|
|
of_property_read_u32(bd->dev->of_node, "rohm,ddr-backup-power", &val);
|
|
if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
|
|
dev_err(bd->dev, "invalid %s mode %u\n",
|
|
"rohm,ddr-backup-power", val);
|
|
return -EINVAL;
|
|
}
|
|
bdreg->bkup_mode_cnt_keepon = val;
|
|
|
|
bdreg->rstbmode_level = of_property_read_bool(bd->dev->of_node,
|
|
"rohm,rstbmode-level");
|
|
bdreg->rstbmode_pulse = of_property_read_bool(bd->dev->of_node,
|
|
"rohm,rstbmode-pulse");
|
|
if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
|
|
dev_err(bd->dev, "only one rohm,rstbmode-* may be specified");
|
|
return -EINVAL;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
if (bdreg->bkup_mode_cnt_keepon) {
|
|
int ret;
|
|
|
|
/*
|
|
* Backup mode is enabled by default in pulse mode, but needs
|
|
* explicit user setup in level mode.
|
|
*/
|
|
bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;
|
|
|
|
ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
|
|
{ "bd9571mwv-regulator", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);
|
|
|
|
static struct platform_driver bd9571mwv_regulator_driver = {
|
|
.driver = {
|
|
.name = "bd9571mwv-regulator",
|
|
.pm = DEV_PM_OPS,
|
|
},
|
|
.probe = bd9571mwv_regulator_probe,
|
|
.remove = bd9571mwv_regulator_remove,
|
|
.id_table = bd9571mwv_regulator_id_table,
|
|
};
|
|
module_platform_driver(bd9571mwv_regulator_driver);
|
|
|
|
MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
|
|
MODULE_DESCRIPTION("BD9571MWV Regulator driver");
|
|
MODULE_LICENSE("GPL v2");
|