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a1867f85 ML |
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 | ||
601e6d48 | 109 | static int rsmu_i2c_probe(struct i2c_client *client) |
a1867f85 | 110 | { |
601e6d48 | 111 | const struct i2c_device_id *id = i2c_client_get_device_id(client); |
a1867f85 ML |
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 | ||
ed5c2f5f | 149 | static void rsmu_i2c_remove(struct i2c_client *client) |
a1867f85 ML |
150 | { |
151 | struct rsmu_ddata *rsmu = i2c_get_clientdata(client); | |
152 | ||
153 | rsmu_core_exit(rsmu); | |
a1867f85 ML |
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 | }, | |
601e6d48 | 183 | .probe_new = rsmu_i2c_probe, |
a1867f85 ML |
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"); |