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243 lines
6.3 KiB
243 lines
6.3 KiB
/* |
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* pbias-regulator.c |
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* |
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* Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/ |
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* Author: Balaji T K <[email protected]> |
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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_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 resource *res; |
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struct regulator_config cfg = { }; |
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struct regulator_desc *desc; |
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struct regulator_dev *rdev; |
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struct regmap *syscon; |
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const struct pbias_reg_info *info; |
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int ret, count, idx; |
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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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desc = devm_kcalloc(&pdev->dev, count, sizeof(*desc), GFP_KERNEL); |
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if (!desc) |
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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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data = of_device_get_match_data(&pdev->dev); |
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if (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 && 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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desc->name = info->name; |
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desc->owner = THIS_MODULE; |
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desc->type = REGULATOR_VOLTAGE; |
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desc->ops = &pbias_regulator_voltage_ops; |
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desc->volt_table = info->pbias_volt_table; |
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desc->n_voltages = info->n_voltages; |
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desc->enable_time = info->enable_time; |
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desc->vsel_reg = offset; |
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desc->vsel_mask = info->vmode; |
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desc->enable_reg = offset; |
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desc->enable_mask = info->enable_mask; |
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desc->enable_val = info->enable; |
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desc->disable_val = info->disable_val; |
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cfg.init_data = pbias_matches[idx].init_data; |
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cfg.of_node = pbias_matches[idx].of_node; |
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rdev = devm_regulator_register(&pdev->dev, desc, &cfg); |
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if (IS_ERR(rdev)) { |
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ret = PTR_ERR(rdev); |
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dev_err(&pdev->dev, |
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"Failed to register regulator: %d\n", ret); |
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return ret; |
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} |
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desc++; |
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count--; |
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} |
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return 0; |
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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 <[email protected]>"); |
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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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