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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bcm590xx.c (3047B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Broadcom BCM590xx PMU
      4 *
      5 * Copyright 2014 Linaro Limited
      6 * Author: Matt Porter <mporter@linaro.org>
      7 */
      8
      9#include <linux/err.h>
     10#include <linux/i2c.h>
     11#include <linux/init.h>
     12#include <linux/mfd/bcm590xx.h>
     13#include <linux/mfd/core.h>
     14#include <linux/module.h>
     15#include <linux/moduleparam.h>
     16#include <linux/of.h>
     17#include <linux/of_device.h>
     18#include <linux/regmap.h>
     19#include <linux/slab.h>
     20
     21static const struct mfd_cell bcm590xx_devs[] = {
     22	{
     23		.name = "bcm590xx-vregs",
     24	},
     25};
     26
     27static const struct regmap_config bcm590xx_regmap_config_pri = {
     28	.reg_bits	= 8,
     29	.val_bits	= 8,
     30	.max_register	= BCM590XX_MAX_REGISTER_PRI,
     31	.cache_type	= REGCACHE_RBTREE,
     32};
     33
     34static const struct regmap_config bcm590xx_regmap_config_sec = {
     35	.reg_bits	= 8,
     36	.val_bits	= 8,
     37	.max_register	= BCM590XX_MAX_REGISTER_SEC,
     38	.cache_type	= REGCACHE_RBTREE,
     39};
     40
     41static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri,
     42			      const struct i2c_device_id *id)
     43{
     44	struct bcm590xx *bcm590xx;
     45	int ret;
     46
     47	bcm590xx = devm_kzalloc(&i2c_pri->dev, sizeof(*bcm590xx), GFP_KERNEL);
     48	if (!bcm590xx)
     49		return -ENOMEM;
     50
     51	i2c_set_clientdata(i2c_pri, bcm590xx);
     52	bcm590xx->dev = &i2c_pri->dev;
     53	bcm590xx->i2c_pri = i2c_pri;
     54
     55	bcm590xx->regmap_pri = devm_regmap_init_i2c(i2c_pri,
     56						 &bcm590xx_regmap_config_pri);
     57	if (IS_ERR(bcm590xx->regmap_pri)) {
     58		ret = PTR_ERR(bcm590xx->regmap_pri);
     59		dev_err(&i2c_pri->dev, "primary regmap init failed: %d\n", ret);
     60		return ret;
     61	}
     62
     63	/* Secondary I2C slave address is the base address with A(2) asserted */
     64	bcm590xx->i2c_sec = i2c_new_dummy_device(i2c_pri->adapter,
     65					  i2c_pri->addr | BIT(2));
     66	if (IS_ERR(bcm590xx->i2c_sec)) {
     67		dev_err(&i2c_pri->dev, "failed to add secondary I2C device\n");
     68		return PTR_ERR(bcm590xx->i2c_sec);
     69	}
     70	i2c_set_clientdata(bcm590xx->i2c_sec, bcm590xx);
     71
     72	bcm590xx->regmap_sec = devm_regmap_init_i2c(bcm590xx->i2c_sec,
     73						&bcm590xx_regmap_config_sec);
     74	if (IS_ERR(bcm590xx->regmap_sec)) {
     75		ret = PTR_ERR(bcm590xx->regmap_sec);
     76		dev_err(&bcm590xx->i2c_sec->dev,
     77			"secondary regmap init failed: %d\n", ret);
     78		goto err;
     79	}
     80
     81	ret = devm_mfd_add_devices(&i2c_pri->dev, -1, bcm590xx_devs,
     82				   ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL);
     83	if (ret < 0) {
     84		dev_err(&i2c_pri->dev, "failed to add sub-devices: %d\n", ret);
     85		goto err;
     86	}
     87
     88	return 0;
     89
     90err:
     91	i2c_unregister_device(bcm590xx->i2c_sec);
     92	return ret;
     93}
     94
     95static const struct of_device_id bcm590xx_of_match[] = {
     96	{ .compatible = "brcm,bcm59056" },
     97	{ }
     98};
     99MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
    100
    101static const struct i2c_device_id bcm590xx_i2c_id[] = {
    102	{ "bcm59056" },
    103	{ }
    104};
    105MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
    106
    107static struct i2c_driver bcm590xx_i2c_driver = {
    108	.driver = {
    109		   .name = "bcm590xx",
    110		   .of_match_table = bcm590xx_of_match,
    111	},
    112	.probe = bcm590xx_i2c_probe,
    113	.id_table = bcm590xx_i2c_id,
    114};
    115module_i2c_driver(bcm590xx_i2c_driver);
    116
    117MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
    118MODULE_DESCRIPTION("BCM590xx multi-function driver");
    119MODULE_LICENSE("GPL v2");