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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
61052652 VP |
2 | /* |
3 | * Hardware monitoring driver for Texas Instruments TPS53679 | |
4 | * | |
5 | * Copyright (c) 2017 Mellanox Technologies. All rights reserved. | |
6 | * Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com> | |
61052652 VP |
7 | */ |
8 | ||
53030bcc | 9 | #include <linux/bits.h> |
61052652 VP |
10 | #include <linux/err.h> |
11 | #include <linux/i2c.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
39f03438 | 15 | #include <linux/of.h> |
61052652 VP |
16 | #include "pmbus.h" |
17 | ||
63eb4587 | 18 | enum chips { |
cb3d37b5 | 19 | tps53647, tps53667, tps53676, tps53679, tps53681, tps53688 |
63eb4587 GR |
20 | }; |
21 | ||
6f944004 GR |
22 | #define TPS53647_PAGE_NUM 1 |
23 | ||
cb3d37b5 ER |
24 | #define TPS53676_USER_DATA_03 0xb3 |
25 | #define TPS53676_MAX_PHASES 7 | |
26 | ||
61052652 VP |
27 | #define TPS53679_PROT_VR12_5MV 0x01 /* VR12.0 mode, 5-mV DAC */ |
28 | #define TPS53679_PROT_VR12_5_10MV 0x02 /* VR12.5 mode, 10-mV DAC */ | |
29 | #define TPS53679_PROT_VR13_10MV 0x04 /* VR13.0 mode, 10-mV DAC */ | |
30 | #define TPS53679_PROT_IMVP8_5MV 0x05 /* IMVP8 mode, 5-mV DAC */ | |
31 | #define TPS53679_PROT_VR13_5MV 0x07 /* VR13.0 mode, 5-mV DAC */ | |
32 | #define TPS53679_PAGE_NUM 2 | |
33 | ||
53030bcc GR |
34 | #define TPS53681_DEVICE_ID 0x81 |
35 | ||
36 | #define TPS53681_PMBUS_REVISION 0x33 | |
37 | ||
38 | #define TPS53681_MFR_SPECIFIC_20 0xe4 /* Number of phases, per page */ | |
39 | ||
dd431939 SK |
40 | static const struct i2c_device_id tps53679_id[]; |
41 | ||
53030bcc GR |
42 | static int tps53679_identify_mode(struct i2c_client *client, |
43 | struct pmbus_driver_info *info) | |
61052652 VP |
44 | { |
45 | u8 vout_params; | |
b9fa0a3a | 46 | int i, ret; |
61052652 | 47 | |
6f944004 | 48 | for (i = 0; i < info->pages; i++) { |
b9fa0a3a VP |
49 | /* Read the register with VOUT scaling value.*/ |
50 | ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE); | |
51 | if (ret < 0) | |
52 | return ret; | |
61052652 | 53 | |
b9fa0a3a | 54 | vout_params = ret & GENMASK(4, 0); |
61052652 | 55 | |
b9fa0a3a VP |
56 | switch (vout_params) { |
57 | case TPS53679_PROT_VR13_10MV: | |
58 | case TPS53679_PROT_VR12_5_10MV: | |
59 | info->vrm_version[i] = vr13; | |
60 | break; | |
61 | case TPS53679_PROT_VR13_5MV: | |
62 | case TPS53679_PROT_VR12_5MV: | |
63 | case TPS53679_PROT_IMVP8_5MV: | |
64 | info->vrm_version[i] = vr12; | |
65 | break; | |
66 | default: | |
67 | return -EINVAL; | |
68 | } | |
61052652 VP |
69 | } |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
53030bcc GR |
74 | static int tps53679_identify_phases(struct i2c_client *client, |
75 | struct pmbus_driver_info *info) | |
76 | { | |
77 | int ret; | |
78 | ||
79 | /* On TPS53681, only channel A provides per-phase output current */ | |
80 | ret = pmbus_read_byte_data(client, 0, TPS53681_MFR_SPECIFIC_20); | |
81 | if (ret < 0) | |
82 | return ret; | |
83 | info->phases[0] = (ret & 0x07) + 1; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static int tps53679_identify_chip(struct i2c_client *client, | |
89 | u8 revision, u16 id) | |
90 | { | |
91 | u8 buf[I2C_SMBUS_BLOCK_MAX]; | |
92 | int ret; | |
93 | ||
94 | ret = pmbus_read_byte_data(client, 0, PMBUS_REVISION); | |
95 | if (ret < 0) | |
96 | return ret; | |
97 | if (ret != revision) { | |
98 | dev_err(&client->dev, "Unexpected PMBus revision 0x%x\n", ret); | |
99 | return -ENODEV; | |
100 | } | |
101 | ||
102 | ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf); | |
103 | if (ret < 0) | |
104 | return ret; | |
105 | if (ret != 1 || buf[0] != id) { | |
106 | dev_err(&client->dev, "Unexpected device ID 0x%x\n", buf[0]); | |
107 | return -ENODEV; | |
108 | } | |
109 | return 0; | |
110 | } | |
111 | ||
112 | /* | |
113 | * Common identification function for chips with multi-phase support. | |
114 | * Since those chips have special configuration registers, we want to have | |
115 | * some level of reassurance that we are really talking with the chip | |
116 | * being probed. Check PMBus revision and chip ID. | |
117 | */ | |
118 | static int tps53679_identify_multiphase(struct i2c_client *client, | |
119 | struct pmbus_driver_info *info, | |
120 | int pmbus_rev, int device_id) | |
121 | { | |
122 | int ret; | |
123 | ||
124 | ret = tps53679_identify_chip(client, pmbus_rev, device_id); | |
125 | if (ret < 0) | |
126 | return ret; | |
127 | ||
128 | ret = tps53679_identify_mode(client, info); | |
129 | if (ret < 0) | |
130 | return ret; | |
131 | ||
132 | return tps53679_identify_phases(client, info); | |
133 | } | |
134 | ||
135 | static int tps53679_identify(struct i2c_client *client, | |
136 | struct pmbus_driver_info *info) | |
137 | { | |
138 | return tps53679_identify_mode(client, info); | |
139 | } | |
140 | ||
141 | static int tps53681_identify(struct i2c_client *client, | |
142 | struct pmbus_driver_info *info) | |
143 | { | |
144 | return tps53679_identify_multiphase(client, info, | |
145 | TPS53681_PMBUS_REVISION, | |
146 | TPS53681_DEVICE_ID); | |
147 | } | |
148 | ||
cb3d37b5 ER |
149 | static int tps53676_identify(struct i2c_client *client, |
150 | struct pmbus_driver_info *info) | |
151 | { | |
152 | u8 buf[I2C_SMBUS_BLOCK_MAX]; | |
153 | int phases_a = 0, phases_b = 0; | |
154 | int i, ret; | |
155 | ||
156 | ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf); | |
157 | if (ret < 0) | |
158 | return ret; | |
159 | if (strncmp("TI\x53\x67\x60", buf, 5)) { | |
160 | dev_err(&client->dev, "Unexpected device ID: %s\n", buf); | |
161 | return -ENODEV; | |
162 | } | |
163 | ||
164 | ret = i2c_smbus_read_block_data(client, TPS53676_USER_DATA_03, buf); | |
165 | if (ret < 0) | |
166 | return ret; | |
167 | if (ret != 24) | |
168 | return -EIO; | |
169 | for (i = 0; i < 2 * TPS53676_MAX_PHASES; i += 2) { | |
170 | if (buf[i + 1] & 0x80) { | |
171 | if (buf[i] & 0x08) | |
172 | phases_b++; | |
173 | else | |
174 | phases_a++; | |
175 | } | |
176 | } | |
177 | ||
178 | info->format[PSC_VOLTAGE_OUT] = linear; | |
179 | info->pages = 1; | |
180 | info->phases[0] = phases_a; | |
181 | if (phases_b > 0) { | |
182 | info->pages = 2; | |
183 | info->phases[1] = phases_b; | |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
53030bcc GR |
188 | static int tps53681_read_word_data(struct i2c_client *client, int page, |
189 | int phase, int reg) | |
190 | { | |
191 | /* | |
192 | * For reading the total output current (READ_IOUT) for all phases, | |
193 | * the chip datasheet is a bit vague. It says "PHASE must be set to | |
194 | * FFh to access all phases simultaneously. PHASE may also be set to | |
195 | * 80h readack (!) the total phase current". | |
196 | * Experiments show that the command does _not_ report the total | |
197 | * current for all phases if the phase is set to 0xff. Instead, it | |
198 | * appears to report the current of one of the phases. Override phase | |
199 | * parameter with 0x80 when reading the total output current on page 0. | |
200 | */ | |
201 | if (reg == PMBUS_READ_IOUT && page == 0 && phase == 0xff) | |
202 | return pmbus_read_word_data(client, page, 0x80, reg); | |
203 | return -ENODATA; | |
204 | } | |
205 | ||
61052652 | 206 | static struct pmbus_driver_info tps53679_info = { |
61052652 VP |
207 | .format[PSC_VOLTAGE_IN] = linear, |
208 | .format[PSC_VOLTAGE_OUT] = vid, | |
209 | .format[PSC_TEMPERATURE] = linear, | |
210 | .format[PSC_CURRENT_OUT] = linear, | |
211 | .format[PSC_POWER] = linear, | |
39c749ac GR |
212 | .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | |
213 | PMBUS_HAVE_STATUS_INPUT | | |
63eb4587 | 214 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
61052652 VP |
215 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
216 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | | |
217 | PMBUS_HAVE_POUT, | |
39c749ac | 218 | .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
61052652 VP |
219 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
220 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | | |
221 | PMBUS_HAVE_POUT, | |
53030bcc GR |
222 | .pfunc[0] = PMBUS_HAVE_IOUT, |
223 | .pfunc[1] = PMBUS_HAVE_IOUT, | |
224 | .pfunc[2] = PMBUS_HAVE_IOUT, | |
225 | .pfunc[3] = PMBUS_HAVE_IOUT, | |
226 | .pfunc[4] = PMBUS_HAVE_IOUT, | |
227 | .pfunc[5] = PMBUS_HAVE_IOUT, | |
cb3d37b5 | 228 | .pfunc[6] = PMBUS_HAVE_IOUT, |
61052652 VP |
229 | }; |
230 | ||
dd431939 | 231 | static int tps53679_probe(struct i2c_client *client) |
61052652 | 232 | { |
63eb4587 | 233 | struct device *dev = &client->dev; |
ff066653 | 234 | struct pmbus_driver_info *info; |
63eb4587 GR |
235 | enum chips chip_id; |
236 | ||
237 | if (dev->of_node) | |
30572c7b | 238 | chip_id = (uintptr_t)of_device_get_match_data(dev); |
63eb4587 | 239 | else |
dd431939 | 240 | chip_id = i2c_match_id(tps53679_id, client)->driver_data; |
ff066653 | 241 | |
63eb4587 | 242 | info = devm_kmemdup(dev, &tps53679_info, sizeof(*info), GFP_KERNEL); |
ff066653 VP |
243 | if (!info) |
244 | return -ENOMEM; | |
245 | ||
63eb4587 | 246 | switch (chip_id) { |
6f944004 GR |
247 | case tps53647: |
248 | case tps53667: | |
249 | info->pages = TPS53647_PAGE_NUM; | |
250 | info->identify = tps53679_identify; | |
251 | break; | |
cb3d37b5 ER |
252 | case tps53676: |
253 | info->identify = tps53676_identify; | |
254 | break; | |
63eb4587 GR |
255 | case tps53679: |
256 | case tps53688: | |
257 | info->pages = TPS53679_PAGE_NUM; | |
258 | info->identify = tps53679_identify; | |
259 | break; | |
53030bcc GR |
260 | case tps53681: |
261 | info->pages = TPS53679_PAGE_NUM; | |
262 | info->phases[0] = 6; | |
263 | info->identify = tps53681_identify; | |
264 | info->read_word_data = tps53681_read_word_data; | |
265 | break; | |
63eb4587 GR |
266 | default: |
267 | return -ENODEV; | |
268 | } | |
269 | ||
dd431939 | 270 | return pmbus_do_probe(client, info); |
61052652 VP |
271 | } |
272 | ||
273 | static const struct i2c_device_id tps53679_id[] = { | |
cb3d37b5 | 274 | {"bmr474", tps53676}, |
6f944004 GR |
275 | {"tps53647", tps53647}, |
276 | {"tps53667", tps53667}, | |
cb3d37b5 | 277 | {"tps53676", tps53676}, |
63eb4587 | 278 | {"tps53679", tps53679}, |
53030bcc | 279 | {"tps53681", tps53681}, |
63eb4587 | 280 | {"tps53688", tps53688}, |
61052652 VP |
281 | {} |
282 | }; | |
283 | ||
284 | MODULE_DEVICE_TABLE(i2c, tps53679_id); | |
285 | ||
e91cb17b | 286 | static const struct of_device_id __maybe_unused tps53679_of_match[] = { |
6f944004 GR |
287 | {.compatible = "ti,tps53647", .data = (void *)tps53647}, |
288 | {.compatible = "ti,tps53667", .data = (void *)tps53667}, | |
cb3d37b5 | 289 | {.compatible = "ti,tps53676", .data = (void *)tps53676}, |
63eb4587 | 290 | {.compatible = "ti,tps53679", .data = (void *)tps53679}, |
53030bcc | 291 | {.compatible = "ti,tps53681", .data = (void *)tps53681}, |
63eb4587 | 292 | {.compatible = "ti,tps53688", .data = (void *)tps53688}, |
61052652 VP |
293 | {} |
294 | }; | |
295 | MODULE_DEVICE_TABLE(of, tps53679_of_match); | |
296 | ||
297 | static struct i2c_driver tps53679_driver = { | |
298 | .driver = { | |
299 | .name = "tps53679", | |
300 | .of_match_table = of_match_ptr(tps53679_of_match), | |
301 | }, | |
1975d167 | 302 | .probe = tps53679_probe, |
61052652 VP |
303 | .id_table = tps53679_id, |
304 | }; | |
305 | ||
306 | module_i2c_driver(tps53679_driver); | |
307 | ||
308 | MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>"); | |
309 | MODULE_DESCRIPTION("PMBus driver for Texas Instruments TPS53679"); | |
310 | MODULE_LICENSE("GPL"); | |
b94ca77e | 311 | MODULE_IMPORT_NS(PMBUS); |