// SPDX-License-Identifier: GPL-2.0
/*
* ROHM BD9571MWV-M and BD9574MWF-M regulator driver
*
* Copyright (C) 2017 Marek Vasut <[email protected]>
*
* Based on the TPS65086 driver
*
* NOTE: VD09 is missing
*/
#include <linux/mfd/rohm-generic.h>
#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 regmap *regmap;
/* 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_reg *bdreg,
unsigned int *mode)
{
int ret;
ret = regmap_read(bdreg->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
if (ret) {
dev_err(regmap_get_device(bdreg->regmap),
"failed to read backup mode (%d)\n", ret);
return ret;
}
return 0;
}
static int bd9571mwv_bkup_mode_write(struct bd9571mwv_reg *bdreg,
unsigned int mode)
{
int ret;
ret = regmap_write(bdreg->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
if (ret) {
dev_err(regmap_get_device(bdreg->regmap),
"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 sysfs_emit(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, &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, 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, &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, 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, bdreg->bkup_mode_cnt_saved);
}
static const struct dev_pm_ops bd9571mwv_pm = {
SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
};
static void bd9571mwv_regulator_remove(struct platform_device *pdev)
{
device_remove_file(&pdev->dev, &dev_attr_backup_mode);
}
#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 regulator_config config = { };
struct bd9571mwv_reg *bdreg;
struct regulator_dev *rdev;
unsigned int val;
int i;
enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
if (!bdreg)
return -ENOMEM;
bdreg->regmap = dev_get_regmap(pdev->dev.parent, NULL);
platform_set_drvdata(pdev, bdreg);
config.dev = &pdev->dev;
config.dev->of_node = pdev->dev.parent->of_node;
config.driver_data = bdreg;
config.regmap = bdreg->regmap;
for (i = 0; i < ARRAY_SIZE(regulators); i++) {
/* BD9574MWF supports DVFS only */
if (chip == ROHM_CHIP_TYPE_BD9574 && regulators[i].id != DVFS)
continue;
rdev = devm_regulator_register(&pdev->dev, ®ulators[i],
&config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register %s regulator\n",
regulators[i].name);
return PTR_ERR(rdev);
}
}
val = 0;
of_property_read_u32(config.dev->of_node, "rohm,ddr-backup-power", &val);
if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
dev_err(&pdev->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(config.dev->of_node,
"rohm,rstbmode-level");
bdreg->rstbmode_pulse = of_property_read_bool(config.dev->of_node,
"rohm,rstbmode-pulse");
if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
dev_err(&pdev->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", ROHM_CHIP_TYPE_BD9571 },
{ "bd9574mwf-regulator", ROHM_CHIP_TYPE_BD9574 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);
static struct platform_driver bd9571mwv_regulator_driver = {
.driver = {
.name = "bd9571mwv-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.pm = DEV_PM_OPS,
},
.probe = bd9571mwv_regulator_probe,
.remove_new = bd9571mwv_regulator_remove,
.id_table = bd9571mwv_regulator_id_table,
};
module_platform_driver(bd9571mwv_regulator_driver);
MODULE_AUTHOR("Marek Vasut <[email protected]>");
MODULE_DESCRIPTION("BD9571MWV Regulator driver");
MODULE_LICENSE("GPL v2");
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