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