--- /dev/null
+/*
+ * pbias-regulator.c
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
+ * Author: Balaji T K <balajitk@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+struct pbias_reg_info {
+ u32 enable;
+ u32 enable_mask;
+ u32 vmode;
+ unsigned int enable_time;
+ char *name;
+};
+
+struct pbias_regulator_data {
+ struct regulator_desc desc;
+ void __iomem *pbias_addr;
+ unsigned int pbias_reg;
+ struct regulator_dev *dev;
+ struct regmap *syscon;
+ const struct pbias_reg_info *info;
+ int voltage;
+};
+
+static int pbias_regulator_set_voltage(struct regulator_dev *dev,
+ int min_uV, int max_uV, unsigned *selector)
+{
+ struct pbias_regulator_data *data = rdev_get_drvdata(dev);
+ const struct pbias_reg_info *info = data->info;
+ int ret, vmode;
+
+ if (min_uV <= 1800000)
+ vmode = 0;
+ else if (min_uV > 1800000)
+ vmode = info->vmode;
+
+ ret = regmap_update_bits(data->syscon, data->pbias_reg,
+ info->vmode, vmode);
+
+ return ret;
+}
+
+static int pbias_regulator_get_voltage(struct regulator_dev *rdev)
+{
+ struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
+ const struct pbias_reg_info *info = data->info;
+ int value, voltage;
+
+ regmap_read(data->syscon, data->pbias_reg, &value);
+ value &= info->vmode;
+
+ voltage = value ? 3000000 : 1800000;
+
+ return voltage;
+}
+
+static int pbias_regulator_enable(struct regulator_dev *rdev)
+{
+ struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
+ const struct pbias_reg_info *info = data->info;
+ int ret;
+
+ ret = regmap_update_bits(data->syscon, data->pbias_reg,
+ info->enable_mask, info->enable);
+
+ return ret;
+}
+
+static int pbias_regulator_disable(struct regulator_dev *rdev)
+{
+ struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
+ const struct pbias_reg_info *info = data->info;
+ int ret;
+
+ ret = regmap_update_bits(data->syscon, data->pbias_reg,
+ info->enable_mask, 0);
+ return ret;
+}
+
+static int pbias_regulator_is_enable(struct regulator_dev *rdev)
+{
+ struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
+ const struct pbias_reg_info *info = data->info;
+ int value;
+
+ regmap_read(data->syscon, data->pbias_reg, &value);
+
+ return (value & info->enable_mask) == info->enable_mask;
+}
+
+static struct regulator_ops pbias_regulator_voltage_ops = {
+ .set_voltage = pbias_regulator_set_voltage,
+ .get_voltage = pbias_regulator_get_voltage,
+ .enable = pbias_regulator_enable,
+ .disable = pbias_regulator_disable,
+ .is_enabled = pbias_regulator_is_enable,
+};
+
+static const struct pbias_reg_info pbias_mmc_omap2430 = {
+ .enable = BIT(1),
+ .enable_mask = BIT(1),
+ .vmode = BIT(0),
+ .enable_time = 100,
+ .name = "pbias_mmc_omap2430"
+};
+
+static const struct pbias_reg_info pbias_sim_omap3 = {
+ .enable = BIT(9),
+ .enable_mask = BIT(9),
+ .vmode = BIT(8),
+ .enable_time = 100,
+ .name = "pbias_sim_omap3"
+};
+
+static const struct pbias_reg_info pbias_mmc_omap4 = {
+ .enable = BIT(26) | BIT(22),
+ .enable_mask = BIT(26) | BIT(25) | BIT(22),
+ .vmode = BIT(21),
+ .enable_time = 100,
+ .name = "pbias_mmc_omap4"
+};
+
+static const struct pbias_reg_info pbias_mmc_omap5 = {
+ .enable = BIT(27) | BIT(26),
+ .enable_mask = BIT(27) | BIT(25) | BIT(26),
+ .vmode = BIT(21),
+ .enable_time = 100,
+ .name = "pbias_mmc_omap5"
+};
+
+static struct of_regulator_match pbias_matches[] = {
+ { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
+ { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
+ { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
+ { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
+};
+#define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)
+
+static const struct of_device_id pbias_of_match[] = {
+ { .compatible = "ti,pbias-omap", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, pbias_of_match);
+
+static int pbias_regulator_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct pbias_regulator_data *drvdata;
+ struct resource *res;
+ struct regulator_config cfg = { };
+ struct regmap *syscon;
+ const struct pbias_reg_info *info;
+ int ret = 0;
+ int count, idx, data_idx = 0;
+
+ count = of_regulator_match(&pdev->dev, np, pbias_matches,
+ PBIAS_NUM_REGS);
+ if (count < 0)
+ return count;
+
+ drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
+ * count, GFP_KERNEL);
+ if (drvdata == NULL) {
+ dev_err(&pdev->dev, "Failed to allocate device data\n");
+ return -ENOMEM;
+ }
+
+ syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
+ if (IS_ERR(syscon))
+ return PTR_ERR(syscon);
+
+ cfg.dev = &pdev->dev;
+
+ for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
+ if (!pbias_matches[idx].init_data ||
+ !pbias_matches[idx].of_node)
+ continue;
+
+ info = pbias_matches[idx].driver_data;
+ if (!info)
+ return -ENODEV;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+
+ drvdata[data_idx].pbias_reg = res->start;
+ drvdata[data_idx].syscon = syscon;
+ drvdata[data_idx].info = info;
+ drvdata[data_idx].desc.name = info->name;
+ drvdata[data_idx].desc.owner = THIS_MODULE;
+ drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
+ drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
+ drvdata[data_idx].desc.n_voltages = 2;
+ drvdata[data_idx].desc.enable_time = info->enable_time;
+
+ cfg.init_data = pbias_matches[idx].init_data;
+ cfg.driver_data = &drvdata[data_idx];
+ cfg.of_node = pbias_matches[idx].of_node;
+
+ drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
+ &drvdata[data_idx].desc, &cfg);
+ if (IS_ERR(drvdata[data_idx].dev)) {
+ ret = PTR_ERR(drvdata[data_idx].dev);
+ dev_err(&pdev->dev,
+ "Failed to register regulator: %d\n", ret);
+ goto err_regulator;
+ }
+ data_idx++;
+ }
+
+ platform_set_drvdata(pdev, drvdata);
+
+err_regulator:
+ return ret;
+}
+
+static struct platform_driver pbias_regulator_driver = {
+ .probe = pbias_regulator_probe,
+ .driver = {
+ .name = "pbias-regulator",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pbias_of_match),
+ },
+};
+
+module_platform_driver(pbias_regulator_driver);
+
+MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
+MODULE_DESCRIPTION("pbias voltage regulator");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pbias-regulator");
projects / cascardo / linux.git / blobdiff