diff options
Diffstat (limited to 'drivers/regulator/bd9571mwv-regulator.c')
| -rw-r--r-- | drivers/regulator/bd9571mwv-regulator.c | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/drivers/regulator/bd9571mwv-regulator.c b/drivers/regulator/bd9571mwv-regulator.c new file mode 100644 index 0000000000..d469481d84 --- /dev/null +++ b/drivers/regulator/bd9571mwv-regulator.c @@ -0,0 +1,367 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ROHM BD9571MWV-M and BD9574MWF-M regulator driver + * + * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com> + * + * 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 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 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 = 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"); |