xref: /openbmc/linux/drivers/hwmon/smpro-hwmon.c (revision 27e45f2e) 
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 
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 
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 
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 
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 
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 
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 
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 *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 
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