263 lines
7.1 KiB
C
263 lines
7.1 KiB
C
/*
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* pbias-regulator.c
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*
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* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
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* Author: Balaji T K <balajitk@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/mfd/syscon.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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struct pbias_reg_info {
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u32 enable;
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u32 enable_mask;
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u32 disable_val;
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u32 vmode;
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unsigned int enable_time;
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char *name;
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const unsigned int *pbias_volt_table;
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int n_voltages;
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};
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struct pbias_regulator_data {
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struct regulator_desc desc;
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void __iomem *pbias_addr;
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struct regulator_dev *dev;
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struct regmap *syscon;
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const struct pbias_reg_info *info;
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int voltage;
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};
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struct pbias_of_data {
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unsigned int offset;
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};
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static const unsigned int pbias_volt_table_3_0V[] = {
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1800000,
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3000000
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};
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static const unsigned int pbias_volt_table_3_3V[] = {
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1800000,
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3300000
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};
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static const struct regulator_ops pbias_regulator_voltage_ops = {
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.list_voltage = regulator_list_voltage_table,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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};
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static const struct pbias_reg_info pbias_mmc_omap2430 = {
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.enable = BIT(1),
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.enable_mask = BIT(1),
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.vmode = BIT(0),
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.disable_val = 0,
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.enable_time = 100,
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.pbias_volt_table = pbias_volt_table_3_0V,
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.n_voltages = 2,
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.name = "pbias_mmc_omap2430"
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};
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static const struct pbias_reg_info pbias_sim_omap3 = {
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.enable = BIT(9),
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.enable_mask = BIT(9),
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.vmode = BIT(8),
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.enable_time = 100,
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.pbias_volt_table = pbias_volt_table_3_0V,
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.n_voltages = 2,
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.name = "pbias_sim_omap3"
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};
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static const struct pbias_reg_info pbias_mmc_omap4 = {
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.enable = BIT(26) | BIT(22),
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.enable_mask = BIT(26) | BIT(25) | BIT(22),
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.disable_val = BIT(25),
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.vmode = BIT(21),
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.enable_time = 100,
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.pbias_volt_table = pbias_volt_table_3_0V,
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.n_voltages = 2,
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.name = "pbias_mmc_omap4"
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};
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static const struct pbias_reg_info pbias_mmc_omap5 = {
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.enable = BIT(27) | BIT(26),
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.enable_mask = BIT(27) | BIT(25) | BIT(26),
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.disable_val = BIT(25),
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.vmode = BIT(21),
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.enable_time = 100,
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.pbias_volt_table = pbias_volt_table_3_3V,
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.n_voltages = 2,
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.name = "pbias_mmc_omap5"
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};
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static struct of_regulator_match pbias_matches[] = {
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{ .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
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{ .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
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{ .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
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{ .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
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};
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#define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)
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/* Offset from SCM general area (and syscon) base */
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static const struct pbias_of_data pbias_of_data_omap2 = {
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.offset = 0x230,
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};
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static const struct pbias_of_data pbias_of_data_omap3 = {
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.offset = 0x2b0,
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};
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static const struct pbias_of_data pbias_of_data_omap4 = {
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.offset = 0x60,
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};
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static const struct pbias_of_data pbias_of_data_omap5 = {
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.offset = 0x60,
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};
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static const struct pbias_of_data pbias_of_data_dra7 = {
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.offset = 0xe00,
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};
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static const struct of_device_id pbias_of_match[] = {
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{ .compatible = "ti,pbias-omap", },
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{ .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
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{ .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
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{ .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
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{ .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
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{ .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
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{},
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};
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MODULE_DEVICE_TABLE(of, pbias_of_match);
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static int pbias_regulator_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct pbias_regulator_data *drvdata;
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struct resource *res;
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struct regulator_config cfg = { };
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struct regmap *syscon;
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const struct pbias_reg_info *info;
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int ret = 0;
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int count, idx, data_idx = 0;
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const struct of_device_id *match;
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const struct pbias_of_data *data;
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unsigned int offset;
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count = of_regulator_match(&pdev->dev, np, pbias_matches,
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PBIAS_NUM_REGS);
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if (count < 0)
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return count;
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drvdata = devm_kcalloc(&pdev->dev,
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count, sizeof(struct pbias_regulator_data),
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GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
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if (IS_ERR(syscon))
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return PTR_ERR(syscon);
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match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev);
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if (match && match->data) {
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data = match->data;
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offset = data->offset;
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} else {
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -EINVAL;
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offset = res->start;
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dev_WARN(&pdev->dev,
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"using legacy dt data for pbias offset\n");
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}
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cfg.regmap = syscon;
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cfg.dev = &pdev->dev;
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for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
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if (!pbias_matches[idx].init_data ||
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!pbias_matches[idx].of_node)
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continue;
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info = pbias_matches[idx].driver_data;
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if (!info)
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return -ENODEV;
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drvdata[data_idx].syscon = syscon;
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drvdata[data_idx].info = info;
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drvdata[data_idx].desc.name = info->name;
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drvdata[data_idx].desc.owner = THIS_MODULE;
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drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
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drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
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drvdata[data_idx].desc.volt_table = info->pbias_volt_table;
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drvdata[data_idx].desc.n_voltages = info->n_voltages;
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drvdata[data_idx].desc.enable_time = info->enable_time;
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drvdata[data_idx].desc.vsel_reg = offset;
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drvdata[data_idx].desc.vsel_mask = info->vmode;
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drvdata[data_idx].desc.enable_reg = offset;
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drvdata[data_idx].desc.enable_mask = info->enable_mask;
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drvdata[data_idx].desc.enable_val = info->enable;
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drvdata[data_idx].desc.disable_val = info->disable_val;
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cfg.init_data = pbias_matches[idx].init_data;
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cfg.driver_data = &drvdata[data_idx];
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cfg.of_node = pbias_matches[idx].of_node;
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drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
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&drvdata[data_idx].desc, &cfg);
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if (IS_ERR(drvdata[data_idx].dev)) {
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ret = PTR_ERR(drvdata[data_idx].dev);
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dev_err(&pdev->dev,
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"Failed to register regulator: %d\n", ret);
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goto err_regulator;
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}
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data_idx++;
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}
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platform_set_drvdata(pdev, drvdata);
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err_regulator:
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return ret;
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}
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static struct platform_driver pbias_regulator_driver = {
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.probe = pbias_regulator_probe,
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.driver = {
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.name = "pbias-regulator",
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.of_match_table = of_match_ptr(pbias_of_match),
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},
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};
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module_platform_driver(pbias_regulator_driver);
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MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
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MODULE_DESCRIPTION("pbias voltage regulator");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pbias-regulator");
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