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
rsmu_cm_volatile_reg(struct device * dev,unsigned int reg)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
rsmu_sabre_volatile_reg(struct device * dev,unsigned int reg)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
rsmu_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)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
rsmu_i2c_remove(struct i2c_client * client)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
rsmu_i2c_init(void)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
rsmu_i2c_exit(void)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");
202
