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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hi6421-pmic-core.c (3197B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Device driver for Hi6421 PMIC
      4 *
      5 * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
      6 *              http://www.hisilicon.com
      7 * Copyright (c) <2013-2017> Linaro Ltd.
      8 *              https://www.linaro.org
      9 *
     10 * Author: Guodong Xu <guodong.xu@linaro.org>
     11 */
     12
     13#include <linux/device.h>
     14#include <linux/err.h>
     15#include <linux/mfd/core.h>
     16#include <linux/mfd/hi6421-pmic.h>
     17#include <linux/module.h>
     18#include <linux/of_device.h>
     19#include <linux/platform_device.h>
     20#include <linux/regmap.h>
     21
     22static const struct mfd_cell hi6421_devs[] = {
     23	{ .name = "hi6421-regulator", },
     24};
     25
     26static const struct mfd_cell hi6421v530_devs[] = {
     27	{ .name = "hi6421v530-regulator", },
     28};
     29
     30static const struct regmap_config hi6421_regmap_config = {
     31	.reg_bits = 32,
     32	.reg_stride = 4,
     33	.val_bits = 8,
     34	.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
     35};
     36
     37static const struct of_device_id of_hi6421_pmic_match[] = {
     38	{
     39		.compatible = "hisilicon,hi6421-pmic",
     40		.data = (void *)HI6421
     41	},
     42	{
     43		.compatible = "hisilicon,hi6421v530-pmic",
     44		.data = (void *)HI6421_V530
     45	},
     46	{ },
     47};
     48MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
     49
     50static int hi6421_pmic_probe(struct platform_device *pdev)
     51{
     52	struct hi6421_pmic *pmic;
     53	struct resource *res;
     54	const struct of_device_id *id;
     55	const struct mfd_cell *subdevs;
     56	enum hi6421_type type;
     57	void __iomem *base;
     58	int n_subdevs, ret;
     59
     60	id = of_match_device(of_hi6421_pmic_match, &pdev->dev);
     61	if (!id)
     62		return -EINVAL;
     63	type = (enum hi6421_type)id->data;
     64
     65	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
     66	if (!pmic)
     67		return -ENOMEM;
     68
     69	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     70	base = devm_ioremap_resource(&pdev->dev, res);
     71	if (IS_ERR(base))
     72		return PTR_ERR(base);
     73
     74	pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
     75						 &hi6421_regmap_config);
     76	if (IS_ERR(pmic->regmap)) {
     77		dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n",
     78						PTR_ERR(pmic->regmap));
     79		return PTR_ERR(pmic->regmap);
     80	}
     81
     82	platform_set_drvdata(pdev, pmic);
     83
     84	switch (type) {
     85	case HI6421:
     86		/* set over-current protection debounce 8ms */
     87		regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
     88				(HI6421_OCP_DEB_SEL_MASK
     89				 | HI6421_OCP_EN_DEBOUNCE_MASK
     90				 | HI6421_OCP_AUTO_STOP_MASK),
     91				(HI6421_OCP_DEB_SEL_8MS
     92				 | HI6421_OCP_EN_DEBOUNCE_ENABLE));
     93
     94		subdevs = hi6421_devs;
     95		n_subdevs = ARRAY_SIZE(hi6421_devs);
     96		break;
     97	case HI6421_V530:
     98		subdevs = hi6421v530_devs;
     99		n_subdevs = ARRAY_SIZE(hi6421v530_devs);
    100		break;
    101	default:
    102		dev_err(&pdev->dev, "Unknown device type %d\n",
    103						(unsigned int)type);
    104		return -EINVAL;
    105	}
    106
    107	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
    108				   subdevs, n_subdevs, NULL, 0, NULL);
    109	if (ret) {
    110		dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret);
    111		return ret;
    112	}
    113
    114	return 0;
    115}
    116
    117static struct platform_driver hi6421_pmic_driver = {
    118	.driver = {
    119		.name = "hi6421_pmic",
    120		.of_match_table = of_hi6421_pmic_match,
    121	},
    122	.probe	= hi6421_pmic_probe,
    123};
    124module_platform_driver(hi6421_pmic_driver);
    125
    126MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
    127MODULE_DESCRIPTION("Hi6421 PMIC driver");
    128MODULE_LICENSE("GPL v2");