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path: root/drivers/regulator/pbias-regulator.c
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Diffstat (limited to 'drivers/regulator/pbias-regulator.c')
-rw-r--r--drivers/regulator/pbias-regulator.c243
1 files changed, 243 insertions, 0 deletions
diff --git a/drivers/regulator/pbias-regulator.c b/drivers/regulator/pbias-regulator.c
new file mode 100644
index 000000000..4eccf12f3
--- /dev/null
+++ b/drivers/regulator/pbias-regulator.c
@@ -0,0 +1,243 @@
+/*
+ * pbias-regulator.c
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - https://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 disable_val;
+ u32 vmode;
+ unsigned int enable_time;
+ char *name;
+ const unsigned int *pbias_volt_table;
+ int n_voltages;
+};
+
+struct pbias_of_data {
+ unsigned int offset;
+};
+
+static const unsigned int pbias_volt_table_3_0V[] = {
+ 1800000,
+ 3000000
+};
+
+static const unsigned int pbias_volt_table_3_3V[] = {
+ 1800000,
+ 3300000
+};
+
+static const struct regulator_ops pbias_regulator_voltage_ops = {
+ .list_voltage = regulator_list_voltage_table,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+static const struct pbias_reg_info pbias_mmc_omap2430 = {
+ .enable = BIT(1),
+ .enable_mask = BIT(1),
+ .vmode = BIT(0),
+ .disable_val = 0,
+ .enable_time = 100,
+ .pbias_volt_table = pbias_volt_table_3_0V,
+ .n_voltages = 2,
+ .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,
+ .pbias_volt_table = pbias_volt_table_3_0V,
+ .n_voltages = 2,
+ .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),
+ .disable_val = BIT(25),
+ .vmode = BIT(21),
+ .enable_time = 100,
+ .pbias_volt_table = pbias_volt_table_3_0V,
+ .n_voltages = 2,
+ .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),
+ .disable_val = BIT(25),
+ .vmode = BIT(21),
+ .enable_time = 100,
+ .pbias_volt_table = pbias_volt_table_3_3V,
+ .n_voltages = 2,
+ .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)
+
+/* Offset from SCM general area (and syscon) base */
+
+static const struct pbias_of_data pbias_of_data_omap2 = {
+ .offset = 0x230,
+};
+
+static const struct pbias_of_data pbias_of_data_omap3 = {
+ .offset = 0x2b0,
+};
+
+static const struct pbias_of_data pbias_of_data_omap4 = {
+ .offset = 0x60,
+};
+
+static const struct pbias_of_data pbias_of_data_omap5 = {
+ .offset = 0x60,
+};
+
+static const struct pbias_of_data pbias_of_data_dra7 = {
+ .offset = 0xe00,
+};
+
+static const struct of_device_id pbias_of_match[] = {
+ { .compatible = "ti,pbias-omap", },
+ { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
+ { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
+ { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
+ { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
+ { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
+ {},
+};
+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 resource *res;
+ struct regulator_config cfg = { };
+ struct regulator_desc *desc;
+ struct regulator_dev *rdev;
+ struct regmap *syscon;
+ const struct pbias_reg_info *info;
+ int ret, count, idx;
+ const struct pbias_of_data *data;
+ unsigned int offset;
+
+ count = of_regulator_match(&pdev->dev, np, pbias_matches,
+ PBIAS_NUM_REGS);
+ if (count < 0)
+ return count;
+
+ desc = devm_kcalloc(&pdev->dev, count, sizeof(*desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+
+ syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
+ if (IS_ERR(syscon))
+ return PTR_ERR(syscon);
+
+ data = of_device_get_match_data(&pdev->dev);
+ if (data) {
+ offset = data->offset;
+ } else {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+
+ offset = res->start;
+ dev_WARN(&pdev->dev,
+ "using legacy dt data for pbias offset\n");
+ }
+
+ cfg.regmap = syscon;
+ cfg.dev = &pdev->dev;
+
+ for (idx = 0; idx < PBIAS_NUM_REGS && count; idx++) {
+ if (!pbias_matches[idx].init_data ||
+ !pbias_matches[idx].of_node)
+ continue;
+
+ info = pbias_matches[idx].driver_data;
+ if (!info)
+ return -ENODEV;
+
+ desc->name = info->name;
+ desc->owner = THIS_MODULE;
+ desc->type = REGULATOR_VOLTAGE;
+ desc->ops = &pbias_regulator_voltage_ops;
+ desc->volt_table = info->pbias_volt_table;
+ desc->n_voltages = info->n_voltages;
+ desc->enable_time = info->enable_time;
+ desc->vsel_reg = offset;
+ desc->vsel_mask = info->vmode;
+ desc->enable_reg = offset;
+ desc->enable_mask = info->enable_mask;
+ desc->enable_val = info->enable;
+ desc->disable_val = info->disable_val;
+
+ cfg.init_data = pbias_matches[idx].init_data;
+ cfg.of_node = pbias_matches[idx].of_node;
+
+ rdev = devm_regulator_register(&pdev->dev, desc, &cfg);
+ if (IS_ERR(rdev)) {
+ ret = PTR_ERR(rdev);
+ dev_err(&pdev->dev,
+ "Failed to register regulator: %d\n", ret);
+ return ret;
+ }
+ desc++;
+ count--;
+ }
+
+ return 0;
+}
+
+static struct platform_driver pbias_regulator_driver = {
+ .probe = pbias_regulator_probe,
+ .driver = {
+ .name = "pbias-regulator",
+ .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");