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// SPDX-License-Identifier: GPL-2.0+
/*
* I2C driver for Renesas Synchronization Management Unit (SMU) devices.
*
* Copyright (C) 2021 Integrated Device Technology, Inc., a Renesas Company.
*/
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rsmu.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include "rsmu.h"
/*
* 16-bit register address: the lower 8 bits of the register address come
* from the offset addr byte and the upper 8 bits come from the page register.
*/
#define RSMU_CM_PAGE_ADDR 0xFD
#define RSMU_CM_PAGE_WINDOW 256
/*
* 15-bit register address: the lower 7 bits of the register address come
* from the offset addr byte and the upper 8 bits come from the page register.
*/
#define RSMU_SABRE_PAGE_ADDR 0x7F
#define RSMU_SABRE_PAGE_WINDOW 128
static const struct regmap_range_cfg rsmu_cm_range_cfg[] = {
{
.range_min = 0,
.range_max = 0xD000,
.selector_reg = RSMU_CM_PAGE_ADDR,
.selector_mask = 0xFF,
.selector_shift = 0,
.window_start = 0,
.window_len = RSMU_CM_PAGE_WINDOW,
}
};
static const struct regmap_range_cfg rsmu_sabre_range_cfg[] = {
{
.range_min = 0,
.range_max = 0x400,
.selector_reg = RSMU_SABRE_PAGE_ADDR,
.selector_mask = 0xFF,
.selector_shift = 0,
.window_start = 0,
.window_len = RSMU_SABRE_PAGE_WINDOW,
}
};
static bool rsmu_cm_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case RSMU_CM_PAGE_ADDR:
return false;
default:
return true;
}
}
static bool rsmu_sabre_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case RSMU_SABRE_PAGE_ADDR:
return false;
default:
return true;
}
}
static const struct regmap_config rsmu_cm_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0xD000,
.ranges = rsmu_cm_range_cfg,
.num_ranges = ARRAY_SIZE(rsmu_cm_range_cfg),
.volatile_reg = rsmu_cm_volatile_reg,
.cache_type = REGCACHE_RBTREE,
.can_multi_write = true,
};
static const struct regmap_config rsmu_sabre_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x400,
.ranges = rsmu_sabre_range_cfg,
.num_ranges = ARRAY_SIZE(rsmu_sabre_range_cfg),
.volatile_reg = rsmu_sabre_volatile_reg,
.cache_type = REGCACHE_RBTREE,
.can_multi_write = true,
};
static const struct regmap_config rsmu_sl_regmap_config = {
.reg_bits = 16,
.val_bits = 8,
.reg_format_endian = REGMAP_ENDIAN_BIG,
.max_register = 0x339,
.cache_type = REGCACHE_NONE,
.can_multi_write = true,
};
static int rsmu_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
const struct regmap_config *cfg;
struct rsmu_ddata *rsmu;
int ret;
rsmu = devm_kzalloc(&client->dev, sizeof(*rsmu), GFP_KERNEL);
if (!rsmu)
return -ENOMEM;
i2c_set_clientdata(client, rsmu);
rsmu->dev = &client->dev;
rsmu->type = (enum rsmu_type)id->driver_data;
switch (rsmu->type) {
case RSMU_CM:
cfg = &rsmu_cm_regmap_config;
break;
case RSMU_SABRE:
cfg = &rsmu_sabre_regmap_config;
break;
case RSMU_SL:
cfg = &rsmu_sl_regmap_config;
break;
default:
dev_err(rsmu->dev, "Unsupported RSMU device type: %d\n", rsmu->type);
return -ENODEV;
}
rsmu->regmap = devm_regmap_init_i2c(client, cfg);
if (IS_ERR(rsmu->regmap)) {
ret = PTR_ERR(rsmu->regmap);
dev_err(rsmu->dev, "Failed to allocate register map: %d\n", ret);
return ret;
}
return rsmu_core_init(rsmu);
}
static void rsmu_i2c_remove(struct i2c_client *client)
{
struct rsmu_ddata *rsmu = i2c_get_clientdata(client);
rsmu_core_exit(rsmu);
}
static const struct i2c_device_id rsmu_i2c_id[] = {
{ "8a34000", RSMU_CM },
{ "8a34001", RSMU_CM },
{ "82p33810", RSMU_SABRE },
{ "82p33811", RSMU_SABRE },
{ "8v19n850", RSMU_SL },
{ "8v19n851", RSMU_SL },
{}
};
MODULE_DEVICE_TABLE(i2c, rsmu_i2c_id);
static const struct of_device_id rsmu_i2c_of_match[] = {
{ .compatible = "idt,8a34000", .data = (void *)RSMU_CM },
{ .compatible = "idt,8a34001", .data = (void *)RSMU_CM },
{ .compatible = "idt,82p33810", .data = (void *)RSMU_SABRE },
{ .compatible = "idt,82p33811", .data = (void *)RSMU_SABRE },
{ .compatible = "idt,8v19n850", .data = (void *)RSMU_SL },
{ .compatible = "idt,8v19n851", .data = (void *)RSMU_SL },
{}
};
MODULE_DEVICE_TABLE(of, rsmu_i2c_of_match);
static struct i2c_driver rsmu_i2c_driver = {
.driver = {
.name = "rsmu-i2c",
.of_match_table = of_match_ptr(rsmu_i2c_of_match),
},
.probe = rsmu_i2c_probe,
.remove = rsmu_i2c_remove,
.id_table = rsmu_i2c_id,
};
static int __init rsmu_i2c_init(void)
{
return i2c_add_driver(&rsmu_i2c_driver);
}
subsys_initcall(rsmu_i2c_init);
static void __exit rsmu_i2c_exit(void)
{
i2c_del_driver(&rsmu_i2c_driver);
}
module_exit(rsmu_i2c_exit);
MODULE_DESCRIPTION("Renesas SMU I2C driver");
MODULE_LICENSE("GPL");
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