cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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stw481x-vmmc.c (2770B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Regulator driver for STw4810/STw4811 VMMC regulator.
      4 *
      5 * Copyright (C) 2013 ST-Ericsson SA
      6 * Written on behalf of Linaro for ST-Ericsson
      7 *
      8 * Author: Linus Walleij <linus.walleij@linaro.org>
      9 */
     10
     11#include <linux/err.h>
     12#include <linux/init.h>
     13#include <linux/mfd/stw481x.h>
     14#include <linux/module.h>
     15#include <linux/platform_device.h>
     16#include <linux/regulator/driver.h>
     17#include <linux/regulator/of_regulator.h>
     18
     19static const unsigned int stw481x_vmmc_voltages[] = {
     20	1800000,
     21	1800000,
     22	2850000,
     23	3000000,
     24	1850000,
     25	2600000,
     26	2700000,
     27	3300000,
     28};
     29
     30static const struct regulator_ops stw481x_vmmc_ops = {
     31	.list_voltage = regulator_list_voltage_table,
     32	.enable      = regulator_enable_regmap,
     33	.disable     = regulator_disable_regmap,
     34	.is_enabled  = regulator_is_enabled_regmap,
     35	.get_voltage_sel = regulator_get_voltage_sel_regmap,
     36	.set_voltage_sel = regulator_set_voltage_sel_regmap,
     37};
     38
     39static const struct regulator_desc vmmc_regulator = {
     40	.name = "VMMC",
     41	.id   = 0,
     42	.ops  = &stw481x_vmmc_ops,
     43	.type = REGULATOR_VOLTAGE,
     44	.owner = THIS_MODULE,
     45	.n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),
     46	.volt_table = stw481x_vmmc_voltages,
     47	.enable_time = 200, /* FIXME: look this up */
     48	.enable_reg = STW_CONF1,
     49	.enable_mask = STW_CONF1_PDN_VMMC | STW_CONF1_MMC_LS_STATUS,
     50	.enable_val = STW_CONF1_PDN_VMMC,
     51	.vsel_reg = STW_CONF1,
     52	.vsel_mask = STW_CONF1_VMMC_MASK,
     53};
     54
     55static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
     56{
     57	struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
     58	struct regulator_config config = { };
     59	struct regulator_dev *rdev;
     60	int ret;
     61
     62	/* First disable the external VMMC if it's active */
     63	ret = regmap_update_bits(stw481x->map, STW_CONF2,
     64				 STW_CONF2_VMMC_EXT, 0);
     65	if (ret) {
     66		dev_err(&pdev->dev, "could not disable external VMMC\n");
     67		return ret;
     68	}
     69
     70	/* Register VMMC regulator */
     71	config.dev = &pdev->dev;
     72	config.driver_data = stw481x;
     73	config.regmap = stw481x->map;
     74	config.of_node = pdev->dev.of_node;
     75	config.init_data = of_get_regulator_init_data(&pdev->dev,
     76						      pdev->dev.of_node,
     77						      &vmmc_regulator);
     78
     79	rdev = devm_regulator_register(&pdev->dev, &vmmc_regulator, &config);
     80	if (IS_ERR(rdev)) {
     81		dev_err(&pdev->dev,
     82			"error initializing STw481x VMMC regulator\n");
     83		return PTR_ERR(rdev);
     84	}
     85
     86	dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
     87	return 0;
     88}
     89
     90static const struct of_device_id stw481x_vmmc_match[] = {
     91	{ .compatible = "st,stw481x-vmmc", },
     92	{},
     93};
     94
     95static struct platform_driver stw481x_vmmc_regulator_driver = {
     96	.driver = {
     97		.name  = "stw481x-vmmc-regulator",
     98		.of_match_table = stw481x_vmmc_match,
     99	},
    100	.probe = stw481x_vmmc_regulator_probe,
    101};
    102
    103module_platform_driver(stw481x_vmmc_regulator_driver);