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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 * 32-bit register address: the lower 8 bits of the register address come
22 * from the offset addr byte and the upper 24 bits come from the page register.
23 */
24#define RSMU_CM_PAGE_ADDR 0xFC
25#define RSMU_CM_PAGE_MASK 0xFFFFFF00
26#define RSMU_CM_ADDRESS_MASK 0x000000FF
27
28/*
29 * 15-bit register address: the lower 7 bits of the register address come
30 * from the offset addr byte and the upper 8 bits come from the page register.
31 */
32#define RSMU_SABRE_PAGE_ADDR 0x7F
33#define RSMU_SABRE_PAGE_WINDOW 128
34
35static const struct regmap_range_cfg rsmu_sabre_range_cfg[] = {
36 {
37 .range_min = 0,
38 .range_max = 0x400,
39 .selector_reg = RSMU_SABRE_PAGE_ADDR,
40 .selector_mask = 0xFF,
41 .selector_shift = 0,
42 .window_start = 0,
43 .window_len = RSMU_SABRE_PAGE_WINDOW,
44 }
45};
46
47static bool rsmu_sabre_volatile_reg(struct device *dev, unsigned int reg)
48{
49 switch (reg) {
50 case RSMU_SABRE_PAGE_ADDR:
51 return false;
52 default:
53 return true;
54 }
55}
56
57static int rsmu_read_device(struct rsmu_ddata *rsmu, u8 reg, u8 *buf, u16 bytes)
58{
59 struct i2c_client *client = to_i2c_client(rsmu->dev);
60 struct i2c_msg msg[2];
61 int cnt;
62
63 msg[0].addr = client->addr;
64 msg[0].flags = 0;
65 msg[0].len = 1;
66 msg[0].buf = ®
67
68 msg[1].addr = client->addr;
69 msg[1].flags = I2C_M_RD;
70 msg[1].len = bytes;
71 msg[1].buf = buf;
72
73 cnt = i2c_transfer(client->adapter, msg, 2);
74
75 if (cnt < 0) {
76 dev_err(rsmu->dev, "i2c_transfer failed at addr: %04x!", reg);
77 return cnt;
78 } else if (cnt != 2) {
79 dev_err(rsmu->dev,
80 "i2c_transfer sent only %d of 2 messages", cnt);
81 return -EIO;
82 }
83
84 return 0;
85}
86
87static int rsmu_write_device(struct rsmu_ddata *rsmu, u8 reg, u8 *buf, u16 bytes)
88{
89 struct i2c_client *client = to_i2c_client(rsmu->dev);
90 u8 msg[RSMU_MAX_WRITE_COUNT + 1]; /* 1 Byte added for the device register */
91 int cnt;
92
93 if (bytes > RSMU_MAX_WRITE_COUNT)
94 return -EINVAL;
95
96 msg[0] = reg;
97 memcpy(&msg[1], buf, bytes);
98
99 cnt = i2c_master_send(client, msg, bytes + 1);
100
101 if (cnt < 0) {
102 dev_err(&client->dev,
103 "i2c_master_send failed at addr: %04x!", reg);
104 return cnt;
105 }
106
107 return 0;
108}
109
110static int rsmu_write_page_register(struct rsmu_ddata *rsmu, u32 reg)
111{
112 u32 page = reg & RSMU_CM_PAGE_MASK;
113 u8 buf[4];
114 int err;
115
116 /* Do not modify offset register for none-scsr registers */
117 if (reg < RSMU_CM_SCSR_BASE)
118 return 0;
119
120 /* Simply return if we are on the same page */
121 if (rsmu->page == page)
122 return 0;
123
124 buf[0] = 0x0;
125 buf[1] = (u8)((page >> 8) & 0xFF);
126 buf[2] = (u8)((page >> 16) & 0xFF);
127 buf[3] = (u8)((page >> 24) & 0xFF);
128
129 err = rsmu_write_device(rsmu, RSMU_CM_PAGE_ADDR, buf, sizeof(buf));
130 if (err)
131 dev_err(rsmu->dev, "Failed to set page offset 0x%x\n", page);
132 else
133 /* Remember the last page */
134 rsmu->page = page;
135
136 return err;
137}
138
139static int rsmu_reg_read(void *context, unsigned int reg, unsigned int *val)
140{
141 struct rsmu_ddata *rsmu = i2c_get_clientdata((struct i2c_client *)context);
142 u8 addr = (u8)(reg & RSMU_CM_ADDRESS_MASK);
143 int err;
144
145 err = rsmu_write_page_register(rsmu, reg);
146 if (err)
147 return err;
148
149 err = rsmu_read_device(rsmu, addr, (u8 *)val, 1);
150 if (err)
151 dev_err(rsmu->dev, "Failed to read offset address 0x%x\n", addr);
152
153 return err;
154}
155
156static int rsmu_reg_write(void *context, unsigned int reg, unsigned int val)
157{
158 struct rsmu_ddata *rsmu = i2c_get_clientdata((struct i2c_client *)context);
159 u8 addr = (u8)(reg & RSMU_CM_ADDRESS_MASK);
160 u8 data = (u8)val;
161 int err;
162
163 err = rsmu_write_page_register(rsmu, reg);
164 if (err)
165 return err;
166
167 err = rsmu_write_device(rsmu, addr, &data, 1);
168 if (err)
169 dev_err(rsmu->dev,
170 "Failed to write offset address 0x%x\n", addr);
171
172 return err;
173}
174
175static const struct regmap_config rsmu_cm_regmap_config = {
176 .reg_bits = 32,
177 .val_bits = 8,
178 .max_register = 0x20120000,
179 .reg_read = rsmu_reg_read,
180 .reg_write = rsmu_reg_write,
181 .cache_type = REGCACHE_NONE,
182};
183
184static const struct regmap_config rsmu_sabre_regmap_config = {
185 .reg_bits = 8,
186 .val_bits = 8,
187 .max_register = 0x400,
188 .ranges = rsmu_sabre_range_cfg,
189 .num_ranges = ARRAY_SIZE(rsmu_sabre_range_cfg),
190 .volatile_reg = rsmu_sabre_volatile_reg,
191 .cache_type = REGCACHE_RBTREE,
192 .can_multi_write = true,
193};
194
195static const struct regmap_config rsmu_sl_regmap_config = {
196 .reg_bits = 16,
197 .val_bits = 8,
198 .reg_format_endian = REGMAP_ENDIAN_BIG,
199 .max_register = 0x340,
200 .cache_type = REGCACHE_NONE,
201 .can_multi_write = true,
202};
203
204static int rsmu_i2c_probe(struct i2c_client *client)
205{
206 const struct i2c_device_id *id = i2c_client_get_device_id(client);
207 const struct regmap_config *cfg;
208 struct rsmu_ddata *rsmu;
209 int ret;
210
211 rsmu = devm_kzalloc(&client->dev, sizeof(*rsmu), GFP_KERNEL);
212 if (!rsmu)
213 return -ENOMEM;
214
215 i2c_set_clientdata(client, rsmu);
216
217 rsmu->dev = &client->dev;
218 rsmu->type = (enum rsmu_type)id->driver_data;
219
220 switch (rsmu->type) {
221 case RSMU_CM:
222 cfg = &rsmu_cm_regmap_config;
223 break;
224 case RSMU_SABRE:
225 cfg = &rsmu_sabre_regmap_config;
226 break;
227 case RSMU_SL:
228 cfg = &rsmu_sl_regmap_config;
229 break;
230 default:
231 dev_err(rsmu->dev, "Unsupported RSMU device type: %d\n", rsmu->type);
232 return -ENODEV;
233 }
234
235 if (rsmu->type == RSMU_CM)
236 rsmu->regmap = devm_regmap_init(&client->dev, NULL, client, cfg);
237 else
238 rsmu->regmap = devm_regmap_init_i2c(client, cfg);
239 if (IS_ERR(rsmu->regmap)) {
240 ret = PTR_ERR(rsmu->regmap);
241 dev_err(rsmu->dev, "Failed to allocate register map: %d\n", ret);
242 return ret;
243 }
244
245 return rsmu_core_init(rsmu);
246}
247
248static void rsmu_i2c_remove(struct i2c_client *client)
249{
250 struct rsmu_ddata *rsmu = i2c_get_clientdata(client);
251
252 rsmu_core_exit(rsmu);
253}
254
255static const struct i2c_device_id rsmu_i2c_id[] = {
256 { "8a34000", RSMU_CM },
257 { "8a34001", RSMU_CM },
258 { "82p33810", RSMU_SABRE },
259 { "82p33811", RSMU_SABRE },
260 { "8v19n850", RSMU_SL },
261 { "8v19n851", RSMU_SL },
262 {}
263};
264MODULE_DEVICE_TABLE(i2c, rsmu_i2c_id);
265
266static const struct of_device_id rsmu_i2c_of_match[] = {
267 { .compatible = "idt,8a34000", .data = (void *)RSMU_CM },
268 { .compatible = "idt,8a34001", .data = (void *)RSMU_CM },
269 { .compatible = "idt,82p33810", .data = (void *)RSMU_SABRE },
270 { .compatible = "idt,82p33811", .data = (void *)RSMU_SABRE },
271 { .compatible = "idt,8v19n850", .data = (void *)RSMU_SL },
272 { .compatible = "idt,8v19n851", .data = (void *)RSMU_SL },
273 {}
274};
275MODULE_DEVICE_TABLE(of, rsmu_i2c_of_match);
276
277static struct i2c_driver rsmu_i2c_driver = {
278 .driver = {
279 .name = "rsmu-i2c",
280 .of_match_table = rsmu_i2c_of_match,
281 },
282 .probe = rsmu_i2c_probe,
283 .remove = rsmu_i2c_remove,
284 .id_table = rsmu_i2c_id,
285};
286
287static int __init rsmu_i2c_init(void)
288{
289 return i2c_add_driver(&rsmu_i2c_driver);
290}
291subsys_initcall(rsmu_i2c_init);
292
293static void __exit rsmu_i2c_exit(void)
294{
295 i2c_del_driver(&rsmu_i2c_driver);
296}
297module_exit(rsmu_i2c_exit);
298
299MODULE_DESCRIPTION("Renesas SMU I2C driver");
300MODULE_LICENSE("GPL");
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
34static 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
46static 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
58static 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
68static 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
78static 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
89static 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
100static 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
109static int rsmu_i2c_probe(struct i2c_client *client)
110{
111 const struct i2c_device_id *id = i2c_client_get_device_id(client);
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
149static 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
156static 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};
165MODULE_DEVICE_TABLE(i2c, rsmu_i2c_id);
166
167static 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};
176MODULE_DEVICE_TABLE(of, rsmu_i2c_of_match);
177
178static 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_new = rsmu_i2c_probe,
184 .remove = rsmu_i2c_remove,
185 .id_table = rsmu_i2c_id,
186};
187
188static int __init rsmu_i2c_init(void)
189{
190 return i2c_add_driver(&rsmu_i2c_driver);
191}
192subsys_initcall(rsmu_i2c_init);
193
194static void __exit rsmu_i2c_exit(void)
195{
196 i2c_del_driver(&rsmu_i2c_driver);
197}
198module_exit(rsmu_i2c_exit);
199
200MODULE_DESCRIPTION("Renesas SMU I2C driver");
201MODULE_LICENSE("GPL");