summaryrefslogtreecommitdiffstats
path: root/drivers/macintosh/windfarm_smu_sensors.c
blob: defe9922ebd1b0ba287312c294d9de2fbfa122d5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
/*
 * Windfarm PowerMac thermal control. SMU based sensors
 *
 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
 *                    <benh@kernel.crashing.org>
 *
 * Released under the term of the GNU GPL v2.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/completion.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sections.h>
#include <asm/smu.h>

#include "windfarm.h"

#define VERSION "0.2"

#undef DEBUG

#ifdef DEBUG
#define DBG(args...)	printk(args)
#else
#define DBG(args...)	do { } while(0)
#endif

/*
 * Various SMU "partitions" calibration objects for which we
 * keep pointers here for use by bits & pieces of the driver
 */
static struct smu_sdbp_cpuvcp *cpuvcp;
static int  cpuvcp_version;
static struct smu_sdbp_cpudiode *cpudiode;
static struct smu_sdbp_slotspow *slotspow;
static u8 *debugswitches;

/*
 * SMU basic sensors objects
 */

static LIST_HEAD(smu_ads);

struct smu_ad_sensor {
	struct list_head	link;
	u32			reg;		/* index in SMU */
	struct wf_sensor	sens;
};
#define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens)

static void smu_ads_release(struct wf_sensor *sr)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);

	kfree(ads);
}

static int smu_read_adc(u8 id, s32 *value)
{
	struct smu_simple_cmd	cmd;
	DECLARE_COMPLETION(comp);
	int rc;

	rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1,
			      smu_done_complete, &comp, id);
	if (rc)
		return rc;
	wait_for_completion(&comp);
	if (cmd.cmd.status != 0)
		return cmd.cmd.status;
	if (cmd.cmd.reply_len != 2) {
		printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n",
		       id, cmd.cmd.reply_len);
		return -EIO;
	}
	*value = *((u16 *)cmd.buffer);
	return 0;
}

static int smu_cputemp_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	int rc;
	s32 val;
	s64 scaled;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s64)(((u64)val) * (u64)cpudiode->m_value);
	scaled >>= 3;
	scaled += ((s64)cpudiode->b_value) << 9;
	*value = (s32)(scaled << 1);

	return 0;
}

static int smu_cpuamp_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	s32 val, scaled;
	int rc;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read CPU current failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s32)(val * (u32)cpuvcp->curr_scale);
	scaled += (s32)cpuvcp->curr_offset;
	*value = scaled << 4;

	return 0;
}

static int smu_cpuvolt_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	s32 val, scaled;
	int rc;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s32)(val * (u32)cpuvcp->volt_scale);
	scaled += (s32)cpuvcp->volt_offset;
	*value = scaled << 4;

	return 0;
}

static int smu_slotspow_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	s32 val, scaled;
	int rc;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read slots power failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s32)(val * (u32)slotspow->pow_scale);
	scaled += (s32)slotspow->pow_offset;
	*value = scaled << 4;

	return 0;
}


static struct wf_sensor_ops smu_cputemp_ops = {
	.get_value	= smu_cputemp_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};
static struct wf_sensor_ops smu_cpuamp_ops = {
	.get_value	= smu_cpuamp_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};
static struct wf_sensor_ops smu_cpuvolt_ops = {
	.get_value	= smu_cpuvolt_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};
static struct wf_sensor_ops smu_slotspow_ops = {
	.get_value	= smu_slotspow_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};


static struct smu_ad_sensor *smu_ads_create(struct device_node *node)
{
	struct smu_ad_sensor *ads;
	const char *c, *l;
	const u32 *v;

	ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
	if (ads == NULL)
		return NULL;
	c = get_property(node, "device_type", NULL);
	l = get_property(node, "location", NULL);
	if (c == NULL || l == NULL)
		goto fail;

	/* We currently pick the sensors based on the OF name and location
	 * properties, while Darwin uses the sensor-id's.
	 * The problem with the IDs is that they are model specific while it
	 * looks like apple has been doing a reasonably good job at keeping
	 * the names and locations consistents so I'll stick with the names
	 * and locations for now.
	 */
	if (!strcmp(c, "temp-sensor") &&
	    !strcmp(l, "CPU T-Diode")) {
		ads->sens.ops = &smu_cputemp_ops;
		ads->sens.name = "cpu-temp";
		if (cpudiode == NULL) {
			DBG("wf: cpudiode partition (%02x) not found\n",
			    SMU_SDB_CPUDIODE_ID);
			goto fail;
		}
	} else if (!strcmp(c, "current-sensor") &&
		   !strcmp(l, "CPU Current")) {
		ads->sens.ops = &smu_cpuamp_ops;
		ads->sens.name = "cpu-current";
		if (cpuvcp == NULL) {
			DBG("wf: cpuvcp partition (%02x) not found\n",
			    SMU_SDB_CPUVCP_ID);
			goto fail;
		}
	} else if (!strcmp(c, "voltage-sensor") &&
		   !strcmp(l, "CPU Voltage")) {
		ads->sens.ops = &smu_cpuvolt_ops;
		ads->sens.name = "cpu-voltage";
		if (cpuvcp == NULL) {
			DBG("wf: cpuvcp partition (%02x) not found\n",
			    SMU_SDB_CPUVCP_ID);
			goto fail;
		}
	} else if (!strcmp(c, "power-sensor") &&
		   !strcmp(l, "Slots Power")) {
		ads->sens.ops = &smu_slotspow_ops;
		ads->sens.name = "slots-power";
		if (slotspow == NULL) {
			DBG("wf: slotspow partition (%02x) not found\n",
			    SMU_SDB_SLOTSPOW_ID);
			goto fail;
		}
	} else
		goto fail;

	v = get_property(node, "reg", NULL);
	if (v == NULL)
		goto fail;
	ads->reg = *v;

	if (wf_register_sensor(&ads->sens))
		goto fail;
	return ads;
 fail:
	kfree(ads);
	return NULL;
}

/*
 * SMU Power combo sensor object
 */

struct smu_cpu_power_sensor {
	struct list_head	link;
	struct wf_sensor	*volts;
	struct wf_sensor	*amps;
	int			fake_volts : 1;
	int			quadratic : 1;
	struct wf_sensor	sens;
};
#define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)

static struct smu_cpu_power_sensor *smu_cpu_power;

static void smu_cpu_power_release(struct wf_sensor *sr)
{
	struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);

	if (pow->volts)
		wf_put_sensor(pow->volts);
	if (pow->amps)
		wf_put_sensor(pow->amps);
	kfree(pow);
}

static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
	s32 volts, amps, power;
	u64 tmps, tmpa, tmpb;
	int rc;

	rc = pow->amps->ops->get_value(pow->amps, &amps);
	if (rc)
		return rc;

	if (pow->fake_volts) {
		*value = amps * 12 - 0x30000;
		return 0;
	}

	rc = pow->volts->ops->get_value(pow->volts, &volts);
	if (rc)
		return rc;

	power = (s32)((((u64)volts) * ((u64)amps)) >> 16);
	if (!pow->quadratic) {
		*value = power;
		return 0;
	}
	tmps = (((u64)power) * ((u64)power)) >> 16;
	tmpa = ((u64)cpuvcp->power_quads[0]) * tmps;
	tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power);
	*value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12);

	return 0;
}

static struct wf_sensor_ops smu_cpu_power_ops = {
	.get_value	= smu_cpu_power_get,
	.release	= smu_cpu_power_release,
	.owner		= THIS_MODULE,
};


static struct smu_cpu_power_sensor *
smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps)
{
	struct smu_cpu_power_sensor *pow;

	pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL);
	if (pow == NULL)
		return NULL;
	pow->sens.ops = &smu_cpu_power_ops;
	pow->sens.name = "cpu-power";

	wf_get_sensor(volts);
	pow->volts = volts;
	wf_get_sensor(amps);
	pow->amps = amps;

	/* Some early machines need a faked voltage */
	if (debugswitches && ((*debugswitches) & 0x80)) {
		printk(KERN_INFO "windfarm: CPU Power sensor using faked"
		       " voltage !\n");
		pow->fake_volts = 1;
	} else
		pow->fake_volts = 0;

	/* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now,
	 * I yet have to figure out what's up with 8,2 and will have to
	 * adjust for later, unless we can 100% trust the SDB partition...
	 */
	if ((machine_is_compatible("PowerMac8,1") ||
	     machine_is_compatible("PowerMac8,2") ||
	     machine_is_compatible("PowerMac9,1")) &&
	    cpuvcp_version >= 2) {
		pow->quadratic = 1;
		DBG("windfarm: CPU Power using quadratic transform\n");
	} else
		pow->quadratic = 0;

	if (wf_register_sensor(&pow->sens))
		goto fail;
	return pow;
 fail:
	kfree(pow);
	return NULL;
}

static void smu_fetch_param_partitions(void)
{
	const struct smu_sdbp_header *hdr;

	/* Get CPU voltage/current/power calibration data */
	hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
	if (hdr != NULL) {
		cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1];
		/* Keep version around */
		cpuvcp_version = hdr->version;
	}

	/* Get CPU diode calibration data */
	hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL);
	if (hdr != NULL)
		cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1];

	/* Get slots power calibration data if any */
	hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL);
	if (hdr != NULL)
		slotspow = (struct smu_sdbp_slotspow *)&hdr[1];

	/* Get debug switches if any */
	hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL);
	if (hdr != NULL)
		debugswitches = (u8 *)&hdr[1];
}

static int __init smu_sensors_init(void)
{
	struct device_node *smu, *sensors, *s;
	struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL;

	if (!smu_present())
		return -ENODEV;

	/* Get parameters partitions */
	smu_fetch_param_partitions();

	smu = of_find_node_by_type(NULL, "smu");
	if (smu == NULL)
		return -ENODEV;

	/* Look for sensors subdir */
	for (sensors = NULL;
	     (sensors = of_get_next_child(smu, sensors)) != NULL;)
		if (!strcmp(sensors->name, "sensors"))
			break;

	of_node_put(smu);

	/* Create basic sensors */
	for (s = NULL;
	     sensors && (s = of_get_next_child(sensors, s)) != NULL;) {
		struct smu_ad_sensor *ads;

		ads = smu_ads_create(s);
		if (ads == NULL)
			continue;
		list_add(&ads->link, &smu_ads);
		/* keep track of cpu voltage & current */
		if (!strcmp(ads->sens.name, "cpu-voltage"))
			volt_sensor = ads;
		else if (!strcmp(ads->sens.name, "cpu-current"))
			curr_sensor = ads;
	}

	of_node_put(sensors);

	/* Create CPU power sensor if possible */
	if (volt_sensor && curr_sensor)
		smu_cpu_power = smu_cpu_power_create(&volt_sensor->sens,
						     &curr_sensor->sens);

	return 0;
}

static void __exit smu_sensors_exit(void)
{
	struct smu_ad_sensor *ads;

	/* dispose of power sensor */
	if (smu_cpu_power)
		wf_unregister_sensor(&smu_cpu_power->sens);

	/* dispose of basic sensors */
	while (!list_empty(&smu_ads)) {
		ads = list_entry(smu_ads.next, struct smu_ad_sensor, link);
		list_del(&ads->link);
		wf_unregister_sensor(&ads->sens);
	}
}


module_init(smu_sensors_init);
module_exit(smu_sensors_exit);

MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control");
MODULE_LICENSE("GPL");

OpenPOWER on IntegriCloud