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-rw-r--r--drivers/regulator/bd9571mwv-regulator.c365
1 files changed, 365 insertions, 0 deletions
diff --git a/drivers/regulator/bd9571mwv-regulator.c b/drivers/regulator/bd9571mwv-regulator.c
new file mode 100644
index 000000000..713730757
--- /dev/null
+++ b/drivers/regulator/bd9571mwv-regulator.c
@@ -0,0 +1,365 @@
+/*
+ * ROHM BD9571MWV-M regulator driver
+ *
+ * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
+ *
+ * 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 "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether expressed or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License version 2 for more details.
+ *
+ * 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 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 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 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 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, &regulators[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");