drivers/mfd/rsmu_i2c.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * I2C driver for Renesas Synchronization Management Unit (SMU) devices.
   4  *
   5  * Copyright (C) 2021 Integrated Device Technology, Inc., a Renesas Company.
   6  */
   7
   8 #include <linux/i2c.h>
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mfd/core.h>
  12 #include <linux/mfd/rsmu.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/regmap.h>
  16 #include <linux/slab.h>
  17
  18 #include "rsmu.h"
  19
  20 /*
  21  * 16-bit register address: the lower 8 bits of the register address come
  22  * from the offset addr byte and the upper 8 bits come from the page register.
  23  */
  24 #define RSMU_CM_PAGE_ADDR               0xFD
  25 #define RSMU_CM_PAGE_WINDOW             256
  26
  27 /*
  28  * 15-bit register address: the lower 7 bits of the register address come
  29  * from the offset addr byte and the upper 8 bits come from the page register.
  30  */
  31 #define RSMU_SABRE_PAGE_ADDR            0x7F
  32 #define RSMU_SABRE_PAGE_WINDOW          128
  33
  34 static const struct regmap_range_cfg rsmu_cm_range_cfg[] = {
  35         {
  36                 .range_min = 0,
  37                 .range_max = 0xD000,
  38                 .selector_reg = RSMU_CM_PAGE_ADDR,
  39                 .selector_mask = 0xFF,
  40                 .selector_shift = 0,
  41                 .window_start = 0,
  42                 .window_len = RSMU_CM_PAGE_WINDOW,
  43         }
  44 };
  45
  46 static const struct regmap_range_cfg rsmu_sabre_range_cfg[] = {
  47         {
  48                 .range_min = 0,
  49                 .range_max = 0x400,
  50                 .selector_reg = RSMU_SABRE_PAGE_ADDR,
  51                 .selector_mask = 0xFF,
  52                 .selector_shift = 0,
  53                 .window_start = 0,
  54                 .window_len = RSMU_SABRE_PAGE_WINDOW,
  55         }
  56 };
  57
  58 static bool rsmu_cm_volatile_reg(struct device *dev, unsigned int reg)
  59 {
  60         switch (reg) {
  61         case RSMU_CM_PAGE_ADDR:
  62                 return false;
  63         default:
  64                 return true;
  65         }
  66 }
  67
  68 static bool rsmu_sabre_volatile_reg(struct device *dev, unsigned int reg)
  69 {
  70         switch (reg) {
  71         case RSMU_SABRE_PAGE_ADDR:
  72                 return false;
  73         default:
  74                 return true;
  75         }
  76 }
  77
  78 static const struct regmap_config rsmu_cm_regmap_config = {
  79         .reg_bits = 8,
  80         .val_bits = 8,
  81         .max_register = 0xD000,
  82         .ranges = rsmu_cm_range_cfg,
  83         .num_ranges = ARRAY_SIZE(rsmu_cm_range_cfg),
  84         .volatile_reg = rsmu_cm_volatile_reg,
  85         .cache_type = REGCACHE_RBTREE,
  86         .can_multi_write = true,
  87 };
  88
  89 static const struct regmap_config rsmu_sabre_regmap_config = {
  90         .reg_bits = 8,
  91         .val_bits = 8,
  92         .max_register = 0x400,
  93         .ranges = rsmu_sabre_range_cfg,
  94         .num_ranges = ARRAY_SIZE(rsmu_sabre_range_cfg),
  95         .volatile_reg = rsmu_sabre_volatile_reg,
  96         .cache_type = REGCACHE_RBTREE,
  97         .can_multi_write = true,
  98 };
  99
 100 static const struct regmap_config rsmu_sl_regmap_config = {
 101         .reg_bits = 16,
 102         .val_bits = 8,
 103         .reg_format_endian = REGMAP_ENDIAN_BIG,
 104         .max_register = 0x339,
 105         .cache_type = REGCACHE_NONE,
 106         .can_multi_write = true,
 107 };
 108
 109 static int rsmu_i2c_probe(struct i2c_client *client,
 110                           const struct i2c_device_id *id)
 111 {
 112         const struct regmap_config *cfg;
 113         struct rsmu_ddata *rsmu;
 114         int ret;
 115
 116         rsmu = devm_kzalloc(&client->dev, sizeof(*rsmu), GFP_KERNEL);
 117         if (!rsmu)
 118                 return -ENOMEM;
 119
 120         i2c_set_clientdata(client, rsmu);
 121
 122         rsmu->dev = &client->dev;
 123         rsmu->type = (enum rsmu_type)id->driver_data;
 124
 125         switch (rsmu->type) {
 126         case RSMU_CM:
 127                 cfg = &rsmu_cm_regmap_config;
 128                 break;
 129         case RSMU_SABRE:
 130                 cfg = &rsmu_sabre_regmap_config;
 131                 break;
 132         case RSMU_SL:
 133                 cfg = &rsmu_sl_regmap_config;
 134                 break;
 135         default:
 136                 dev_err(rsmu->dev, "Unsupported RSMU device type: %d\n", rsmu->type);
 137                 return -ENODEV;
 138         }
 139         rsmu->regmap = devm_regmap_init_i2c(client, cfg);
 140         if (IS_ERR(rsmu->regmap)) {
 141                 ret = PTR_ERR(rsmu->regmap);
 142                 dev_err(rsmu->dev, "Failed to allocate register map: %d\n", ret);
 143                 return ret;
 144         }
 145
 146         return rsmu_core_init(rsmu);
 147 }
 148
 149 static void rsmu_i2c_remove(struct i2c_client *client)
 150 {
 151         struct rsmu_ddata *rsmu = i2c_get_clientdata(client);
 152
 153         rsmu_core_exit(rsmu);
 154 }
 155
 156 static const struct i2c_device_id rsmu_i2c_id[] = {
 157         { "8a34000",  RSMU_CM },
 158         { "8a34001",  RSMU_CM },
 159         { "82p33810", RSMU_SABRE },
 160         { "82p33811", RSMU_SABRE },
 161         { "8v19n850", RSMU_SL },
 162         { "8v19n851", RSMU_SL },
 163         {}
 164 };
 165 MODULE_DEVICE_TABLE(i2c, rsmu_i2c_id);
 166
 167 static const struct of_device_id rsmu_i2c_of_match[] = {
 168         { .compatible = "idt,8a34000",  .data = (void *)RSMU_CM },
 169         { .compatible = "idt,8a34001",  .data = (void *)RSMU_CM },
 170         { .compatible = "idt,82p33810", .data = (void *)RSMU_SABRE },
 171         { .compatible = "idt,82p33811", .data = (void *)RSMU_SABRE },
 172         { .compatible = "idt,8v19n850", .data = (void *)RSMU_SL },
 173         { .compatible = "idt,8v19n851", .data = (void *)RSMU_SL },
 174         {}
 175 };
 176 MODULE_DEVICE_TABLE(of, rsmu_i2c_of_match);
 177
 178 static struct i2c_driver rsmu_i2c_driver = {
 179         .driver = {
 180                 .name = "rsmu-i2c",
 181                 .of_match_table = of_match_ptr(rsmu_i2c_of_match),
 182         },
 183         .probe = rsmu_i2c_probe,
 184         .remove = rsmu_i2c_remove,
 185         .id_table = rsmu_i2c_id,
 186 };
 187
 188 static int __init rsmu_i2c_init(void)
 189 {
 190         return i2c_add_driver(&rsmu_i2c_driver);
 191 }
 192 subsys_initcall(rsmu_i2c_init);
 193
 194 static void __exit rsmu_i2c_exit(void)
 195 {
 196         i2c_del_driver(&rsmu_i2c_driver);
 197 }
 198 module_exit(rsmu_i2c_exit);
 199
 200 MODULE_DESCRIPTION("Renesas SMU I2C driver");
 201 MODULE_LICENSE("GPL");