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Diffstat (limited to 'drivers/regulator/act8945a-regulator.c')
-rw-r--r--drivers/regulator/act8945a-regulator.c361
1 files changed, 361 insertions, 0 deletions
diff --git a/drivers/regulator/act8945a-regulator.c b/drivers/regulator/act8945a-regulator.c
new file mode 100644
index 0000000000..24cbdd8338
--- /dev/null
+++ b/drivers/regulator/act8945a-regulator.c
@@ -0,0 +1,361 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Voltage regulation driver for active-semi ACT8945A PMIC
+ *
+ * Copyright (C) 2015 Atmel Corporation
+ *
+ * Author: Wenyou Yang <wenyou.yang@atmel.com>
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <dt-bindings/regulator/active-semi,8945a-regulator.h>
+
+/*
+ * ACT8945A Global Register Map.
+ */
+#define ACT8945A_SYS_MODE 0x00
+#define ACT8945A_SYS_CTRL 0x01
+#define ACT8945A_SYS_UNLK_REGS 0x0b
+#define ACT8945A_DCDC1_VSET1 0x20
+#define ACT8945A_DCDC1_VSET2 0x21
+#define ACT8945A_DCDC1_CTRL 0x22
+#define ACT8945A_DCDC1_SUS 0x24
+#define ACT8945A_DCDC2_VSET1 0x30
+#define ACT8945A_DCDC2_VSET2 0x31
+#define ACT8945A_DCDC2_CTRL 0x32
+#define ACT8945A_DCDC2_SUS 0x34
+#define ACT8945A_DCDC3_VSET1 0x40
+#define ACT8945A_DCDC3_VSET2 0x41
+#define ACT8945A_DCDC3_CTRL 0x42
+#define ACT8945A_DCDC3_SUS 0x44
+#define ACT8945A_LDO1_VSET 0x50
+#define ACT8945A_LDO1_CTRL 0x51
+#define ACT8945A_LDO1_SUS 0x52
+#define ACT8945A_LDO2_VSET 0x54
+#define ACT8945A_LDO2_CTRL 0x55
+#define ACT8945A_LDO2_SUS 0x56
+#define ACT8945A_LDO3_VSET 0x60
+#define ACT8945A_LDO3_CTRL 0x61
+#define ACT8945A_LDO3_SUS 0x62
+#define ACT8945A_LDO4_VSET 0x64
+#define ACT8945A_LDO4_CTRL 0x65
+#define ACT8945A_LDO4_SUS 0x66
+
+/*
+ * Field Definitions.
+ */
+#define ACT8945A_ENA 0x80 /* ON - [7] */
+#define ACT8945A_VSEL_MASK 0x3F /* VSET - [5:0] */
+
+/*
+ * ACT8945A Voltage Number
+ */
+#define ACT8945A_VOLTAGE_NUM 64
+
+enum {
+ ACT8945A_ID_DCDC1,
+ ACT8945A_ID_DCDC2,
+ ACT8945A_ID_DCDC3,
+ ACT8945A_ID_LDO1,
+ ACT8945A_ID_LDO2,
+ ACT8945A_ID_LDO3,
+ ACT8945A_ID_LDO4,
+ ACT8945A_ID_MAX,
+};
+
+struct act8945a_pmic {
+ struct regmap *regmap;
+ u32 op_mode[ACT8945A_ID_MAX];
+};
+
+static const struct linear_range act8945a_voltage_ranges[] = {
+ REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
+ REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
+ REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
+};
+
+static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable)
+{
+ struct regmap *regmap = rdev->regmap;
+ int id = rdev_get_id(rdev);
+ int reg, val;
+
+ switch (id) {
+ case ACT8945A_ID_DCDC1:
+ reg = ACT8945A_DCDC1_SUS;
+ val = 0xa8;
+ break;
+ case ACT8945A_ID_DCDC2:
+ reg = ACT8945A_DCDC2_SUS;
+ val = 0xa8;
+ break;
+ case ACT8945A_ID_DCDC3:
+ reg = ACT8945A_DCDC3_SUS;
+ val = 0xa8;
+ break;
+ case ACT8945A_ID_LDO1:
+ reg = ACT8945A_LDO1_SUS;
+ val = 0xe8;
+ break;
+ case ACT8945A_ID_LDO2:
+ reg = ACT8945A_LDO2_SUS;
+ val = 0xe8;
+ break;
+ case ACT8945A_ID_LDO3:
+ reg = ACT8945A_LDO3_SUS;
+ val = 0xe8;
+ break;
+ case ACT8945A_ID_LDO4:
+ reg = ACT8945A_LDO4_SUS;
+ val = 0xe8;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (enable)
+ val |= BIT(4);
+
+ /*
+ * Ask the PMIC to enable/disable this output when entering hibernate
+ * mode.
+ */
+ return regmap_write(regmap, reg, val);
+}
+
+static int act8945a_set_suspend_enable(struct regulator_dev *rdev)
+{
+ return act8945a_set_suspend_state(rdev, true);
+}
+
+static int act8945a_set_suspend_disable(struct regulator_dev *rdev)
+{
+ return act8945a_set_suspend_state(rdev, false);
+}
+
+static unsigned int act8945a_of_map_mode(unsigned int mode)
+{
+ switch (mode) {
+ case ACT8945A_REGULATOR_MODE_FIXED:
+ case ACT8945A_REGULATOR_MODE_NORMAL:
+ return REGULATOR_MODE_NORMAL;
+ case ACT8945A_REGULATOR_MODE_LOWPOWER:
+ return REGULATOR_MODE_STANDBY;
+ default:
+ return REGULATOR_MODE_INVALID;
+ }
+}
+
+static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
+ struct regmap *regmap = rdev->regmap;
+ int id = rdev_get_id(rdev);
+ int reg, ret, val = 0;
+
+ switch (id) {
+ case ACT8945A_ID_DCDC1:
+ reg = ACT8945A_DCDC1_CTRL;
+ break;
+ case ACT8945A_ID_DCDC2:
+ reg = ACT8945A_DCDC2_CTRL;
+ break;
+ case ACT8945A_ID_DCDC3:
+ reg = ACT8945A_DCDC3_CTRL;
+ break;
+ case ACT8945A_ID_LDO1:
+ reg = ACT8945A_LDO1_CTRL;
+ break;
+ case ACT8945A_ID_LDO2:
+ reg = ACT8945A_LDO2_CTRL;
+ break;
+ case ACT8945A_ID_LDO3:
+ reg = ACT8945A_LDO3_CTRL;
+ break;
+ case ACT8945A_ID_LDO4:
+ reg = ACT8945A_LDO4_CTRL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (mode) {
+ case REGULATOR_MODE_STANDBY:
+ if (id > ACT8945A_ID_DCDC3)
+ val = BIT(5);
+ break;
+ case REGULATOR_MODE_NORMAL:
+ if (id <= ACT8945A_ID_DCDC3)
+ val = BIT(5);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = regmap_update_bits(regmap, reg, BIT(5), val);
+ if (ret)
+ return ret;
+
+ act8945a->op_mode[id] = mode;
+
+ return 0;
+}
+
+static unsigned int act8945a_get_mode(struct regulator_dev *rdev)
+{
+ struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
+ int id = rdev_get_id(rdev);
+
+ if (id < ACT8945A_ID_DCDC1 || id >= ACT8945A_ID_MAX)
+ return -EINVAL;
+
+ return act8945a->op_mode[id];
+}
+
+static const struct regulator_ops act8945a_ops = {
+ .list_voltage = regulator_list_voltage_linear_range,
+ .map_voltage = regulator_map_voltage_linear_range,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .set_mode = act8945a_set_mode,
+ .get_mode = act8945a_get_mode,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_suspend_enable = act8945a_set_suspend_enable,
+ .set_suspend_disable = act8945a_set_suspend_disable,
+};
+
+#define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply) \
+ [_family##_ID_##_id] = { \
+ .name = _name, \
+ .supply_name = _supply, \
+ .of_match = of_match_ptr("REG_"#_id), \
+ .of_map_mode = act8945a_of_map_mode, \
+ .regulators_node = of_match_ptr("regulators"), \
+ .id = _family##_ID_##_id, \
+ .type = REGULATOR_VOLTAGE, \
+ .ops = &act8945a_ops, \
+ .n_voltages = ACT8945A_VOLTAGE_NUM, \
+ .linear_ranges = act8945a_voltage_ranges, \
+ .n_linear_ranges = ARRAY_SIZE(act8945a_voltage_ranges), \
+ .vsel_reg = _family##_##_id##_##_vsel_reg, \
+ .vsel_mask = ACT8945A_VSEL_MASK, \
+ .enable_reg = _family##_##_id##_CTRL, \
+ .enable_mask = ACT8945A_ENA, \
+ .owner = THIS_MODULE, \
+ }
+
+static const struct regulator_desc act8945a_regulators[] = {
+ ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"),
+ ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"),
+ ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"),
+ ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
+ ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
+ ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
+ ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
+};
+
+static const struct regulator_desc act8945a_alt_regulators[] = {
+ ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"),
+ ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"),
+ ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"),
+ ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
+ ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
+ ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
+ ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
+};
+
+static int act8945a_pmic_probe(struct platform_device *pdev)
+{
+ struct regulator_config config = { };
+ const struct regulator_desc *regulators;
+ struct act8945a_pmic *act8945a;
+ struct regulator_dev *rdev;
+ int i, num_regulators;
+ bool voltage_select;
+
+ act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL);
+ if (!act8945a)
+ return -ENOMEM;
+
+ act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!act8945a->regmap) {
+ dev_err(&pdev->dev,
+ "could not retrieve regmap from parent device\n");
+ return -EINVAL;
+ }
+
+ voltage_select = of_property_read_bool(pdev->dev.parent->of_node,
+ "active-semi,vsel-high");
+
+ if (voltage_select) {
+ regulators = act8945a_alt_regulators;
+ num_regulators = ARRAY_SIZE(act8945a_alt_regulators);
+ } else {
+ regulators = act8945a_regulators;
+ num_regulators = ARRAY_SIZE(act8945a_regulators);
+ }
+
+ config.dev = &pdev->dev;
+ config.dev->of_node = pdev->dev.parent->of_node;
+ config.driver_data = act8945a;
+ for (i = 0; i < num_regulators; i++) {
+ rdev = devm_regulator_register(&pdev->dev, &regulators[i],
+ &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev,
+ "failed to register %s regulator\n",
+ regulators[i].name);
+ return PTR_ERR(rdev);
+ }
+ }
+
+ platform_set_drvdata(pdev, act8945a);
+
+ /* Unlock expert registers. */
+ return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef);
+}
+
+static int __maybe_unused act8945a_suspend(struct device *pdev)
+{
+ struct act8945a_pmic *act8945a = dev_get_drvdata(pdev);
+
+ /*
+ * Ask the PMIC to enter the suspend mode on the next PWRHLD
+ * transition.
+ */
+ return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42);
+}
+
+static SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);
+
+static void act8945a_pmic_shutdown(struct platform_device *pdev)
+{
+ struct act8945a_pmic *act8945a = platform_get_drvdata(pdev);
+
+ /*
+ * Ask the PMIC to shutdown everything on the next PWRHLD transition.
+ */
+ regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x0);
+}
+
+static struct platform_driver act8945a_pmic_driver = {
+ .driver = {
+ .name = "act8945a-regulator",
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .pm = &act8945a_pm,
+ },
+ .probe = act8945a_pmic_probe,
+ .shutdown = act8945a_pmic_shutdown,
+};
+module_platform_driver(act8945a_pmic_driver);
+
+MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver");
+MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
+MODULE_LICENSE("GPL");