1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Ampere Computing SoC's SMPro Hardware Monitoring Driver
4 *
5 * Copyright (c) 2022, Ampere Computing LLC
6 */
7 #include <linux/bitfield.h>
8 #include <linux/bitops.h>
9 #include <linux/hwmon.h>
10 #include <linux/hwmon-sysfs.h>
11 #include <linux/kernel.h>
12 #include <linux/mod_devicetable.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/property.h>
16 #include <linux/regmap.h>
17
18 /* Logical Power Sensor Registers */
19 #define SOC_TEMP 0x10
20 #define SOC_VRD_TEMP 0x11
21 #define DIMM_VRD_TEMP 0x12
22 #define CORE_VRD_TEMP 0x13
23 #define CH0_DIMM_TEMP 0x14
24 #define CH1_DIMM_TEMP 0x15
25 #define CH2_DIMM_TEMP 0x16
26 #define CH3_DIMM_TEMP 0x17
27 #define CH4_DIMM_TEMP 0x18
28 #define CH5_DIMM_TEMP 0x19
29 #define CH6_DIMM_TEMP 0x1A
30 #define CH7_DIMM_TEMP 0x1B
31 #define RCA_VRD_TEMP 0x1C
32
33 #define CORE_VRD_PWR 0x20
34 #define SOC_PWR 0x21
35 #define DIMM_VRD1_PWR 0x22
36 #define DIMM_VRD2_PWR 0x23
37 #define CORE_VRD_PWR_MW 0x26
38 #define SOC_PWR_MW 0x27
39 #define DIMM_VRD1_PWR_MW 0x28
40 #define DIMM_VRD2_PWR_MW 0x29
41 #define RCA_VRD_PWR 0x2A
42 #define RCA_VRD_PWR_MW 0x2B
43
44 #define MEM_HOT_THRESHOLD 0x32
45 #define SOC_VR_HOT_THRESHOLD 0x33
46 #define CORE_VRD_VOLT 0x34
47 #define SOC_VRD_VOLT 0x35
48 #define DIMM_VRD1_VOLT 0x36
49 #define DIMM_VRD2_VOLT 0x37
50 #define RCA_VRD_VOLT 0x38
51
52 #define CORE_VRD_CURR 0x39
53 #define SOC_VRD_CURR 0x3A
54 #define DIMM_VRD1_CURR 0x3B
55 #define DIMM_VRD2_CURR 0x3C
56 #define RCA_VRD_CURR 0x3D
57
58 struct smpro_hwmon {
59 struct regmap *regmap;
60 };
61
62 struct smpro_sensor {
63 const u8 reg;
64 const u8 reg_ext;
65 const char *label;
66 };
67
68 static const struct smpro_sensor temperature[] = {
69 {
70 .reg = SOC_TEMP,
71 .label = "temp1 SoC"
72 },
73 {
74 .reg = SOC_VRD_TEMP,
75 .reg_ext = SOC_VR_HOT_THRESHOLD,
76 .label = "temp2 SoC VRD"
77 },
78 {
79 .reg = DIMM_VRD_TEMP,
80 .label = "temp3 DIMM VRD"
81 },
82 {
83 .reg = CORE_VRD_TEMP,
84 .label = "temp4 CORE VRD"
85 },
86 {
87 .reg = CH0_DIMM_TEMP,
88 .reg_ext = MEM_HOT_THRESHOLD,
89 .label = "temp5 CH0 DIMM"
90 },
91 {
92 .reg = CH1_DIMM_TEMP,
93 .reg_ext = MEM_HOT_THRESHOLD,
94 .label = "temp6 CH1 DIMM"
95 },
96 {
97 .reg = CH2_DIMM_TEMP,
98 .reg_ext = MEM_HOT_THRESHOLD,
99 .label = "temp7 CH2 DIMM"
100 },
101 {
102 .reg = CH3_DIMM_TEMP,
103 .reg_ext = MEM_HOT_THRESHOLD,
104 .label = "temp8 CH3 DIMM"
105 },
106 {
107 .reg = CH4_DIMM_TEMP,
108 .reg_ext = MEM_HOT_THRESHOLD,
109 .label = "temp9 CH4 DIMM"
110 },
111 {
112 .reg = CH5_DIMM_TEMP,
113 .reg_ext = MEM_HOT_THRESHOLD,
114 .label = "temp10 CH5 DIMM"
115 },
116 {
117 .reg = CH6_DIMM_TEMP,
118 .reg_ext = MEM_HOT_THRESHOLD,
119 .label = "temp11 CH6 DIMM"
120 },
121 {
122 .reg = CH7_DIMM_TEMP,
123 .reg_ext = MEM_HOT_THRESHOLD,
124 .label = "temp12 CH7 DIMM"
125 },
126 {
127 .reg = RCA_VRD_TEMP,
128 .label = "temp13 RCA VRD"
129 },
130 };
131
132 static const struct smpro_sensor voltage[] = {
133 {
134 .reg = CORE_VRD_VOLT,
135 .label = "vout0 CORE VRD"
136 },
137 {
138 .reg = SOC_VRD_VOLT,
139 .label = "vout1 SoC VRD"
140 },
141 {
142 .reg = DIMM_VRD1_VOLT,
143 .label = "vout2 DIMM VRD1"
144 },
145 {
146 .reg = DIMM_VRD2_VOLT,
147 .label = "vout3 DIMM VRD2"
148 },
149 {
150 .reg = RCA_VRD_VOLT,
151 .label = "vout4 RCA VRD"
152 },
153 };
154
155 static const struct smpro_sensor curr_sensor[] = {
156 {
157 .reg = CORE_VRD_CURR,
158 .label = "iout1 CORE VRD"
159 },
160 {
161 .reg = SOC_VRD_CURR,
162 .label = "iout2 SoC VRD"
163 },
164 {
165 .reg = DIMM_VRD1_CURR,
166 .label = "iout3 DIMM VRD1"
167 },
168 {
169 .reg = DIMM_VRD2_CURR,
170 .label = "iout4 DIMM VRD2"
171 },
172 {
173 .reg = RCA_VRD_CURR,
174 .label = "iout5 RCA VRD"
175 },
176 };
177
178 static const struct smpro_sensor power[] = {
179 {
180 .reg = CORE_VRD_PWR,
181 .reg_ext = CORE_VRD_PWR_MW,
182 .label = "power1 CORE VRD"
183 },
184 {
185 .reg = SOC_PWR,
186 .reg_ext = SOC_PWR_MW,
187 .label = "power2 SoC"
188 },
189 {
190 .reg = DIMM_VRD1_PWR,
191 .reg_ext = DIMM_VRD1_PWR_MW,
192 .label = "power3 DIMM VRD1"
193 },
194 {
195 .reg = DIMM_VRD2_PWR,
196 .reg_ext = DIMM_VRD2_PWR_MW,
197 .label = "power4 DIMM VRD2"
198 },
199 {
200 .reg = RCA_VRD_PWR,
201 .reg_ext = RCA_VRD_PWR_MW,
202 .label = "power5 RCA VRD"
203 },
204 };
205
smpro_read_temp(struct device * dev,u32 attr,int channel,long * val)206 static int smpro_read_temp(struct device *dev, u32 attr, int channel, long *val)
207 {
208 struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
209 unsigned int value;
210 int ret;
211
212 switch (attr) {
213 case hwmon_temp_input:
214 ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value);
215 if (ret)
216 return ret;
217 break;
218 case hwmon_temp_crit:
219 ret = regmap_read(hwmon->regmap, temperature[channel].reg_ext, &value);
220 if (ret)
221 return ret;
222 break;
223 default:
224 return -EOPNOTSUPP;
225 }
226
227 *val = sign_extend32(value, 8) * 1000;
228 return 0;
229 }
230
smpro_read_in(struct device * dev,u32 attr,int channel,long * val)231 static int smpro_read_in(struct device *dev, u32 attr, int channel, long *val)
232 {
233 struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
234 unsigned int value;
235 int ret;
236
237 switch (attr) {
238 case hwmon_in_input:
239 ret = regmap_read(hwmon->regmap, voltage[channel].reg, &value);
240 if (ret < 0)
241 return ret;
242 /* 15-bit value in 1mV */
243 *val = value & 0x7fff;
244 return 0;
245 default:
246 return -EOPNOTSUPP;
247 }
248 }
249
smpro_read_curr(struct device * dev,u32 attr,int channel,long * val)250 static int smpro_read_curr(struct device *dev, u32 attr, int channel, long *val)
251 {
252 struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
253 unsigned int value;
254 int ret;
255
256 switch (attr) {
257 case hwmon_curr_input:
258 ret = regmap_read(hwmon->regmap, curr_sensor[channel].reg, &value);
259 if (ret < 0)
260 return ret;
261 /* Scale reported by the hardware is 1mA */
262 *val = value & 0x7fff;
263 return 0;
264 default:
265 return -EOPNOTSUPP;
266 }
267 }
268
smpro_read_power(struct device * dev,u32 attr,int channel,long * val_pwr)269 static int smpro_read_power(struct device *dev, u32 attr, int channel, long *val_pwr)
270 {
271 struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
272 unsigned int val = 0, val_mw = 0;
273 int ret;
274
275 switch (attr) {
276 case hwmon_power_input:
277 ret = regmap_read(hwmon->regmap, power[channel].reg, &val);
278 if (ret)
279 return ret;
280
281 ret = regmap_read(hwmon->regmap, power[channel].reg_ext, &val_mw);
282 if (ret)
283 return ret;
284 /* 10-bit value */
285 *val_pwr = (val & 0x3ff) * 1000000 + (val_mw & 0x3ff) * 1000;
286 return 0;
287
288 default:
289 return -EOPNOTSUPP;
290 }
291 }
292
smpro_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * val)293 static int smpro_read(struct device *dev, enum hwmon_sensor_types type,
294 u32 attr, int channel, long *val)
295 {
296 switch (type) {
297 case hwmon_temp:
298 return smpro_read_temp(dev, attr, channel, val);
299 case hwmon_in:
300 return smpro_read_in(dev, attr, channel, val);
301 case hwmon_power:
302 return smpro_read_power(dev, attr, channel, val);
303 case hwmon_curr:
304 return smpro_read_curr(dev, attr, channel, val);
305 default:
306 return -EOPNOTSUPP;
307 }
308 }
309
smpro_read_string(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,const char ** str)310 static int smpro_read_string(struct device *dev, enum hwmon_sensor_types type,
311 u32 attr, int channel, const char **str)
312 {
313 switch (type) {
314 case hwmon_temp:
315 switch (attr) {
316 case hwmon_temp_label:
317 *str = temperature[channel].label;
318 return 0;
319 default:
320 break;
321 }
322 break;
323
324 case hwmon_in:
325 switch (attr) {
326 case hwmon_in_label:
327 *str = voltage[channel].label;
328 return 0;
329 default:
330 break;
331 }
332 break;
333
334 case hwmon_curr:
335 switch (attr) {
336 case hwmon_curr_label:
337 *str = curr_sensor[channel].label;
338 return 0;
339 default:
340 break;
341 }
342 break;
343
344 case hwmon_power:
345 switch (attr) {
346 case hwmon_power_label:
347 *str = power[channel].label;
348 return 0;
349 default:
350 break;
351 }
352 break;
353 default:
354 break;
355 }
356
357 return -EOPNOTSUPP;
358 }
359
smpro_is_visible(const void * data,enum hwmon_sensor_types type,u32 attr,int channel)360 static umode_t smpro_is_visible(const void *data, enum hwmon_sensor_types type,
361 u32 attr, int channel)
362 {
363 const struct smpro_hwmon *hwmon = data;
364 unsigned int value;
365 int ret;
366
367 switch (type) {
368 case hwmon_temp:
369 switch (attr) {
370 case hwmon_temp_input:
371 case hwmon_temp_label:
372 case hwmon_temp_crit:
373 ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value);
374 if (ret || value == 0xFFFF)
375 return 0;
376 break;
377 default:
378 break;
379 }
380 break;
381 default:
382 break;
383 }
384
385 return 0444;
386 }
387
388 static const struct hwmon_channel_info * const smpro_info[] = {
389 HWMON_CHANNEL_INFO(temp,
390 HWMON_T_INPUT | HWMON_T_LABEL,
391 HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
392 HWMON_T_INPUT | HWMON_T_LABEL,
393 HWMON_T_INPUT | HWMON_T_LABEL,
394 HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
395 HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
396 HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
397 HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
398 HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
399 HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
400 HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
401 HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
402 HWMON_T_INPUT | HWMON_T_LABEL),
403 HWMON_CHANNEL_INFO(in,
404 HWMON_I_INPUT | HWMON_I_LABEL,
405 HWMON_I_INPUT | HWMON_I_LABEL,
406 HWMON_I_INPUT | HWMON_I_LABEL,
407 HWMON_I_INPUT | HWMON_I_LABEL,
408 HWMON_I_INPUT | HWMON_I_LABEL),
409 HWMON_CHANNEL_INFO(power,
410 HWMON_P_INPUT | HWMON_P_LABEL,
411 HWMON_P_INPUT | HWMON_P_LABEL,
412 HWMON_P_INPUT | HWMON_P_LABEL,
413 HWMON_P_INPUT | HWMON_P_LABEL,
414 HWMON_P_INPUT | HWMON_P_LABEL),
415 HWMON_CHANNEL_INFO(curr,
416 HWMON_C_INPUT | HWMON_C_LABEL,
417 HWMON_C_INPUT | HWMON_C_LABEL,
418 HWMON_C_INPUT | HWMON_C_LABEL,
419 HWMON_C_INPUT | HWMON_C_LABEL,
420 HWMON_C_INPUT | HWMON_C_LABEL),
421 NULL
422 };
423
424 static const struct hwmon_ops smpro_hwmon_ops = {
425 .is_visible = smpro_is_visible,
426 .read = smpro_read,
427 .read_string = smpro_read_string,
428 };
429
430 static const struct hwmon_chip_info smpro_chip_info = {
431 .ops = &smpro_hwmon_ops,
432 .info = smpro_info,
433 };
434
smpro_hwmon_probe(struct platform_device * pdev)435 static int smpro_hwmon_probe(struct platform_device *pdev)
436 {
437 struct smpro_hwmon *hwmon;
438 struct device *hwmon_dev;
439
440 hwmon = devm_kzalloc(&pdev->dev, sizeof(struct smpro_hwmon), GFP_KERNEL);
441 if (!hwmon)
442 return -ENOMEM;
443
444 hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
445 if (!hwmon->regmap)
446 return -ENODEV;
447
448 hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "smpro_hwmon",
449 hwmon, &smpro_chip_info, NULL);
450
451 return PTR_ERR_OR_ZERO(hwmon_dev);
452 }
453
454 static struct platform_driver smpro_hwmon_driver = {
455 .probe = smpro_hwmon_probe,
456 .driver = {
457 .name = "smpro-hwmon",
458 },
459 };
460
461 module_platform_driver(smpro_hwmon_driver);
462
463 MODULE_AUTHOR("Thu Nguyen <thu@os.amperecomputing.com>");
464 MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");
465 MODULE_DESCRIPTION("Ampere Altra SMPro hwmon driver");
466 MODULE_LICENSE("GPL");
467