bcm590xx.c

  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/regmap.h>
 18#include <linux/slab.h>
 19
 20/* Under primary I2C address: */
 21#define BCM590XX_REG_PMUID		0x1e
 22
 23#define BCM590XX_REG_PMUREV		0x1f
 24#define BCM590XX_PMUREV_DIG_MASK	0xF
 25#define BCM590XX_PMUREV_DIG_SHIFT	0
 26#define BCM590XX_PMUREV_ANA_MASK	0xF0
 27#define BCM590XX_PMUREV_ANA_SHIFT	4
 28
 29static const struct mfd_cell bcm590xx_devs[] = {
 30	{
 31		.name = "bcm590xx-vregs",
 32	},
 33};
 34
 35static const struct regmap_config bcm590xx_regmap_config_pri = {
 36	.reg_bits	= 8,
 37	.val_bits	= 8,
 38	.max_register	= BCM590XX_MAX_REGISTER_PRI,
 39	.cache_type	= REGCACHE_MAPLE,
 40};
 41
 42static const struct regmap_config bcm590xx_regmap_config_sec = {
 43	.reg_bits	= 8,
 44	.val_bits	= 8,
 45	.max_register	= BCM590XX_MAX_REGISTER_SEC,
 46	.cache_type	= REGCACHE_MAPLE,
 47};
 48
 49/* Map PMU ID value to model name string */
 50static const char * const bcm590xx_names[] = {
 51	[BCM590XX_PMUID_BCM59054] = "BCM59054",
 52	[BCM590XX_PMUID_BCM59056] = "BCM59056",
 53};
 54
 55static int bcm590xx_parse_version(struct bcm590xx *bcm590xx)
 56{
 57	unsigned int id, rev;
 58	int ret;
 59
 60	/* Get PMU ID and verify that it matches compatible */
 61	ret = regmap_read(bcm590xx->regmap_pri, BCM590XX_REG_PMUID, &id);
 62	if (ret) {
 63		dev_err(bcm590xx->dev, "failed to read PMU ID: %d\n", ret);
 64		return ret;
 65	}
 66
 67	if (id != bcm590xx->pmu_id) {
 68		dev_err(bcm590xx->dev, "Incorrect ID for %s: expected %x, got %x.\n",
 69			bcm590xx_names[bcm590xx->pmu_id], bcm590xx->pmu_id, id);
 70		return -ENODEV;
 71	}
 72
 73	/* Get PMU revision and store it in the info struct */
 74	ret = regmap_read(bcm590xx->regmap_pri, BCM590XX_REG_PMUREV, &rev);
 75	if (ret) {
 76		dev_err(bcm590xx->dev, "failed to read PMU revision: %d\n", ret);
 77		return ret;
 78	}
 79
 80	bcm590xx->rev_digital = (rev & BCM590XX_PMUREV_DIG_MASK) >> BCM590XX_PMUREV_DIG_SHIFT;
 81
 82	bcm590xx->rev_analog = (rev & BCM590XX_PMUREV_ANA_MASK) >> BCM590XX_PMUREV_ANA_SHIFT;
 83
 84	dev_dbg(bcm590xx->dev, "PMU ID 0x%x (%s), revision: digital %d, analog %d",
 85		 id, bcm590xx_names[id], bcm590xx->rev_digital, bcm590xx->rev_analog);
 86
 87	return 0;
 88}
 89
 90static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri)
 91{
 92	struct bcm590xx *bcm590xx;
 93	int ret;
 94
 95	bcm590xx = devm_kzalloc(&i2c_pri->dev, sizeof(*bcm590xx), GFP_KERNEL);
 96	if (!bcm590xx)
 97		return -ENOMEM;
 98
 99	i2c_set_clientdata(i2c_pri, bcm590xx);
100	bcm590xx->dev = &i2c_pri->dev;
101	bcm590xx->i2c_pri = i2c_pri;
102
103	bcm590xx->pmu_id = (uintptr_t) of_device_get_match_data(bcm590xx->dev);
104
105	bcm590xx->regmap_pri = devm_regmap_init_i2c(i2c_pri,
106						 &bcm590xx_regmap_config_pri);
107	if (IS_ERR(bcm590xx->regmap_pri)) {
108		ret = PTR_ERR(bcm590xx->regmap_pri);
109		dev_err(&i2c_pri->dev, "primary regmap init failed: %d\n", ret);
110		return ret;
111	}
112
113	/* Secondary I2C slave address is the base address with A(2) asserted */
114	bcm590xx->i2c_sec = i2c_new_dummy_device(i2c_pri->adapter,
115					  i2c_pri->addr | BIT(2));
116	if (IS_ERR(bcm590xx->i2c_sec)) {
117		dev_err(&i2c_pri->dev, "failed to add secondary I2C device\n");
118		return PTR_ERR(bcm590xx->i2c_sec);
119	}
120	i2c_set_clientdata(bcm590xx->i2c_sec, bcm590xx);
121
122	bcm590xx->regmap_sec = devm_regmap_init_i2c(bcm590xx->i2c_sec,
123						&bcm590xx_regmap_config_sec);
124	if (IS_ERR(bcm590xx->regmap_sec)) {
125		ret = PTR_ERR(bcm590xx->regmap_sec);
126		dev_err(&bcm590xx->i2c_sec->dev,
127			"secondary regmap init failed: %d\n", ret);
128		goto err;
129	}
130
131	ret = bcm590xx_parse_version(bcm590xx);
132	if (ret)
133		goto err;
134
135	ret = devm_mfd_add_devices(&i2c_pri->dev, -1, bcm590xx_devs,
136				   ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL);
137	if (ret < 0) {
138		dev_err(&i2c_pri->dev, "failed to add sub-devices: %d\n", ret);
139		goto err;
140	}
141
142	return 0;
143
144err:
145	i2c_unregister_device(bcm590xx->i2c_sec);
146	return ret;
147}
148
149static const struct of_device_id bcm590xx_of_match[] = {
150	{
151		.compatible = "brcm,bcm59054",
152		.data = (void *)BCM590XX_PMUID_BCM59054,
153	},
154	{
155		.compatible = "brcm,bcm59056",
156		.data = (void *)BCM590XX_PMUID_BCM59056,
157	},
158	{ }
159};
160MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
161
162static const struct i2c_device_id bcm590xx_i2c_id[] = {
163	{ "bcm59054" },
164	{ "bcm59056" },
165	{ }
166};
167MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
168
169static struct i2c_driver bcm590xx_i2c_driver = {
170	.driver = {
171		   .name = "bcm590xx",
172		   .of_match_table = bcm590xx_of_match,
173	},
174	.probe = bcm590xx_i2c_probe,
175	.id_table = bcm590xx_i2c_id,
176};
177module_i2c_driver(bcm590xx_i2c_driver);
178
179MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
180MODULE_DESCRIPTION("BCM590xx multi-function driver");
181MODULE_LICENSE("GPL v2");