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