1 /*
2 * Windfarm PowerMac thermal control. SMU based sensors
3 *
4 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
5 * <benh@kernel.crashing.org>
6 *
7 * Released under the term of the GNU GPL v2.
8 */
9
10 #include <linux/types.h>
11 #include <linux/errno.h>
12 #include <linux/kernel.h>
13 #include <linux/delay.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/wait.h>
17 #include <linux/completion.h>
18 #include <asm/prom.h>
19 #include <asm/machdep.h>
20 #include <asm/io.h>
21 #include <asm/system.h>
22 #include <asm/sections.h>
23 #include <asm/smu.h>
24
25 #include "windfarm.h"
26
27 #define VERSION "0.2"
28
29 #undef DEBUG
30
31 #ifdef DEBUG
32 #define DBG(args...) printk(args)
33 #else
34 #define DBG(args...) do { } while(0)
35 #endif
36
37 /*
38 * Various SMU "partitions" calibration objects for which we
39 * keep pointers here for use by bits & pieces of the driver
40 */
41 static struct smu_sdbp_cpuvcp *cpuvcp;
42 static int cpuvcp_version;
43 static struct smu_sdbp_cpudiode *cpudiode;
44 static struct smu_sdbp_slotspow *slotspow;
45 static u8 *debugswitches;
46
47 /*
48 * SMU basic sensors objects
49 */
50
51 static LIST_HEAD(smu_ads);
52
53 struct smu_ad_sensor {
54 struct list_head link;
55 u32 reg; /* index in SMU */
56 struct wf_sensor sens;
57 };
58 #define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens)
59
60 static void smu_ads_release(struct wf_sensor *sr)
61 {
62 struct smu_ad_sensor *ads = to_smu_ads(sr);
63
64 kfree(ads);
65 }
66
67 static int smu_read_adc(u8 id, s32 *value)
68 {
69 struct smu_simple_cmd cmd;
70 DECLARE_COMPLETION(comp);
71 int rc;
72
73 rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1,
74 smu_done_complete, &comp, id);
75 if (rc)
76 return rc;
77 wait_for_completion(&comp);
78 if (cmd.cmd.status != 0)
79 return cmd.cmd.status;
80 if (cmd.cmd.reply_len != 2) {
81 printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n",
82 id, cmd.cmd.reply_len);
83 return -EIO;
84 }
85 *value = *((u16 *)cmd.buffer);
86 return 0;
87 }
88
89 static int smu_cputemp_get(struct wf_sensor *sr, s32 *value)
90 {
91 struct smu_ad_sensor *ads = to_smu_ads(sr);
92 int rc;
93 s32 val;
94 s64 scaled;
95
96 rc = smu_read_adc(ads->reg, &val);
97 if (rc) {
98 printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n",
99 rc);
100 return rc;
101 }
102
103 /* Ok, we have to scale & adjust, taking units into account */
104 scaled = (s64)(((u64)val) * (u64)cpudiode->m_value);
105 scaled >>= 3;
106 scaled += ((s64)cpudiode->b_value) << 9;
107 *value = (s32)(scaled << 1);
108
109 return 0;
110 }
111
112 static int smu_cpuamp_get(struct wf_sensor *sr, s32 *value)
113 {
114 struct smu_ad_sensor *ads = to_smu_ads(sr);
115 s32 val, scaled;
116 int rc;
117
118 rc = smu_read_adc(ads->reg, &val);
119 if (rc) {
120 printk(KERN_ERR "windfarm: read CPU current failed, err %d\n",
121 rc);
122 return rc;
123 }
124
125 /* Ok, we have to scale & adjust, taking units into account */
126 scaled = (s32)(val * (u32)cpuvcp->curr_scale);
127 scaled += (s32)cpuvcp->curr_offset;
128 *value = scaled << 4;
129
130 return 0;
131 }
132
133 static int smu_cpuvolt_get(struct wf_sensor *sr, s32 *value)
134 {
135 struct smu_ad_sensor *ads = to_smu_ads(sr);
136 s32 val, scaled;
137 int rc;
138
139 rc = smu_read_adc(ads->reg, &val);
140 if (rc) {
141 printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n",
142 rc);
143 return rc;
144 }
145
146 /* Ok, we have to scale & adjust, taking units into account */
147 scaled = (s32)(val * (u32)cpuvcp->volt_scale);
148 scaled += (s32)cpuvcp->volt_offset;
149 *value = scaled << 4;
150
151 return 0;
152 }
153
154 static int smu_slotspow_get(struct wf_sensor *sr, s32 *value)
155 {
156 struct smu_ad_sensor *ads = to_smu_ads(sr);
157 s32 val, scaled;
158 int rc;
159
160 rc = smu_read_adc(ads->reg, &val);
161 if (rc) {
162 printk(KERN_ERR "windfarm: read slots power failed, err %d\n",
163 rc);
164 return rc;
165 }
166
167 /* Ok, we have to scale & adjust, taking units into account */
168 scaled = (s32)(val * (u32)slotspow->pow_scale);
169 scaled += (s32)slotspow->pow_offset;
170 *value = scaled << 4;
171
172 return 0;
173 }
174
175
176 static struct wf_sensor_ops smu_cputemp_ops = {
177 .get_value = smu_cputemp_get,
178 .release = smu_ads_release,
179 .owner = THIS_MODULE,
180 };
181 static struct wf_sensor_ops smu_cpuamp_ops = {
182 .get_value = smu_cpuamp_get,
183 .release = smu_ads_release,
184 .owner = THIS_MODULE,
185 };
186 static struct wf_sensor_ops smu_cpuvolt_ops = {
187 .get_value = smu_cpuvolt_get,
188 .release = smu_ads_release,
189 .owner = THIS_MODULE,
190 };
191 static struct wf_sensor_ops smu_slotspow_ops = {
192 .get_value = smu_slotspow_get,
193 .release = smu_ads_release,
194 .owner = THIS_MODULE,
195 };
196
197
198 static struct smu_ad_sensor *smu_ads_create(struct device_node *node)
199 {
200 struct smu_ad_sensor *ads;
201 char *c, *l;
202 u32 *v;
203
204 ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
205 if (ads == NULL)
206 return NULL;
207 c = (char *)get_property(node, "device_type", NULL);
208 l = (char *)get_property(node, "location", NULL);
209 if (c == NULL || l == NULL)
210 goto fail;
211
212 /* We currently pick the sensors based on the OF name and location
213 * properties, while Darwin uses the sensor-id's.
214 * The problem with the IDs is that they are model specific while it
215 * looks like apple has been doing a reasonably good job at keeping
216 * the names and locations consistents so I'll stick with the names
217 * and locations for now.
218 */
219 if (!strcmp(c, "temp-sensor") &&
220 !strcmp(l, "CPU T-Diode")) {
221 ads->sens.ops = &smu_cputemp_ops;
222 ads->sens.name = "cpu-temp";
223 if (cpudiode == NULL) {
224 DBG("wf: cpudiode partition (%02x) not found\n",
225 SMU_SDB_CPUDIODE_ID);
226 goto fail;
227 }
228 } else if (!strcmp(c, "current-sensor") &&
229 !strcmp(l, "CPU Current")) {
230 ads->sens.ops = &smu_cpuamp_ops;
231 ads->sens.name = "cpu-current";
232 if (cpuvcp == NULL) {
233 DBG("wf: cpuvcp partition (%02x) not found\n",
234 SMU_SDB_CPUVCP_ID);
235 goto fail;
236 }
237 } else if (!strcmp(c, "voltage-sensor") &&
238 !strcmp(l, "CPU Voltage")) {
239 ads->sens.ops = &smu_cpuvolt_ops;
240 ads->sens.name = "cpu-voltage";
241 if (cpuvcp == NULL) {
242 DBG("wf: cpuvcp partition (%02x) not found\n",
243 SMU_SDB_CPUVCP_ID);
244 goto fail;
245 }
246 } else if (!strcmp(c, "power-sensor") &&
247 !strcmp(l, "Slots Power")) {
248 ads->sens.ops = &smu_slotspow_ops;
249 ads->sens.name = "slots-power";
250 if (slotspow == NULL) {
251 DBG("wf: slotspow partition (%02x) not found\n",
252 SMU_SDB_SLOTSPOW_ID);
253 goto fail;
254 }
255 } else
256 goto fail;
257
258 v = (u32 *)get_property(node, "reg", NULL);
259 if (v == NULL)
260 goto fail;
261 ads->reg = *v;
262
263 if (wf_register_sensor(&ads->sens))
264 goto fail;
265 return ads;
266 fail:
267 kfree(ads);
268 return NULL;
269 }
270
271 /*
272 * SMU Power combo sensor object
273 */
274
275 struct smu_cpu_power_sensor {
276 struct list_head link;
277 struct wf_sensor *volts;
278 struct wf_sensor *amps;
279 int fake_volts : 1;
280 int quadratic : 1;
281 struct wf_sensor sens;
282 };
283 #define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)
284
285 static struct smu_cpu_power_sensor *smu_cpu_power;
286
287 static void smu_cpu_power_release(struct wf_sensor *sr)
288 {
289 struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
290
291 if (pow->volts)
292 wf_put_sensor(pow->volts);
293 if (pow->amps)
294 wf_put_sensor(pow->amps);
295 kfree(pow);
296 }
297
298 static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value)
299 {
300 struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
301 s32 volts, amps, power;
302 u64 tmps, tmpa, tmpb;
303 int rc;
304
305 rc = pow->amps->ops->get_value(pow->amps, &s);
306 if (rc)
307 return rc;
308
309 if (pow->fake_volts) {
310 *value = amps * 12 - 0x30000;
311 return 0;
312 }
313
314 rc = pow->volts->ops->get_value(pow->volts, &volts);
315 if (rc)
316 return rc;
317
318 power = (s32)((((u64)volts) * ((u64)amps)) >> 16);
319 if (!pow->quadratic) {
320 *value = power;
321 return 0;
322 }
323 tmps = (((u64)power) * ((u64)power)) >> 16;
324 tmpa = ((u64)cpuvcp->power_quads[0]) * tmps;
325 tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power);
326 *value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12);
327
328 return 0;
329 }
330
331 static struct wf_sensor_ops smu_cpu_power_ops = {
332 .get_value = smu_cpu_power_get,
333 .release = smu_cpu_power_release,
334 .owner = THIS_MODULE,
335 };
336
337
338 static struct smu_cpu_power_sensor *
339 smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps)
340 {
341 struct smu_cpu_power_sensor *pow;
342
343 pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL);
344 if (pow == NULL)
345 return NULL;
346 pow->sens.ops = &smu_cpu_power_ops;
347 pow->sens.name = "cpu-power";
348
349 wf_get_sensor(volts);
350 pow->volts = volts;
351 wf_get_sensor(amps);
352 pow->amps = amps;
353
354 /* Some early machines need a faked voltage */
355 if (debugswitches && ((*debugswitches) & 0x80)) {
356 printk(KERN_INFO "windfarm: CPU Power sensor using faked"
357 " voltage !\n");
358 pow->fake_volts = 1;
359 } else
360 pow->fake_volts = 0;
361
362 /* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now,
363 * I yet have to figure out what's up with 8,2 and will have to
364 * adjust for later, unless we can 100% trust the SDB partition...
365 */
366 if ((machine_is_compatible("PowerMac8,1") ||
367 machine_is_compatible("PowerMac8,2") ||
368 machine_is_compatible("PowerMac9,1")) &&
369 cpuvcp_version >= 2) {
370 pow->quadratic = 1;
371 DBG("windfarm: CPU Power using quadratic transform\n");
372 } else
373 pow->quadratic = 0;
374
375 if (wf_register_sensor(&pow->sens))
376 goto fail;
377 return pow;
378 fail:
379 kfree(pow);
380 return NULL;
381 }
382
383 static void smu_fetch_param_partitions(void)
384 {
385 struct smu_sdbp_header *hdr;
386
387 /* Get CPU voltage/current/power calibration data */
388 hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
389 if (hdr != NULL) {
390 cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1];
391 /* Keep version around */
392 cpuvcp_version = hdr->version;
393 }
394
395 /* Get CPU diode calibration data */
396 hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL);
397 if (hdr != NULL)
398 cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1];
399
400 /* Get slots power calibration data if any */
401 hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL);
402 if (hdr != NULL)
403 slotspow = (struct smu_sdbp_slotspow *)&hdr[1];
404
405 /* Get debug switches if any */
406 hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL);
407 if (hdr != NULL)
408 debugswitches = (u8 *)&hdr[1];
409 }
410
411 static int __init smu_sensors_init(void)
412 {
413 struct device_node *smu, *sensors, *s;
414 struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL;
415
416 if (!smu_present())
417 return -ENODEV;
418
419 /* Get parameters partitions */
420 smu_fetch_param_partitions();
421
422 smu = of_find_node_by_type(NULL, "smu");
423 if (smu == NULL)
424 return -ENODEV;
425
426 /* Look for sensors subdir */
427 for (sensors = NULL;
428 (sensors = of_get_next_child(smu, sensors)) != NULL;)
429 if (!strcmp(sensors->name, "sensors"))
430 break;
431
432 of_node_put(smu);
433
434 /* Create basic sensors */
435 for (s = NULL;
436 sensors && (s = of_get_next_child(sensors, s)) != NULL;) {
437 struct smu_ad_sensor *ads;
438
439 ads = smu_ads_create(s);
440 if (ads == NULL)
441 continue;
442 list_add(&ads->link, &smu_ads);
443 /* keep track of cpu voltage & current */
444 if (!strcmp(ads->sens.name, "cpu-voltage"))
445 volt_sensor = ads;
446 else if (!strcmp(ads->sens.name, "cpu-current"))
447 curr_sensor = ads;
448 }
449
450 of_node_put(sensors);
451
452 /* Create CPU power sensor if possible */
453 if (volt_sensor && curr_sensor)
454 smu_cpu_power = smu_cpu_power_create(&volt_sensor->sens,
455 &curr_sensor->sens);
456
457 return 0;
458 }
459
460 static void __exit smu_sensors_exit(void)
461 {
462 struct smu_ad_sensor *ads;
463
464 /* dispose of power sensor */
465 if (smu_cpu_power)
466 wf_unregister_sensor(&smu_cpu_power->sens);
467
468 /* dispose of basic sensors */
469 while (!list_empty(&smu_ads)) {
470 ads = list_entry(smu_ads.next, struct smu_ad_sensor, link);
471 list_del(&ads->link);
472 wf_unregister_sensor(&ads->sens);
473 }
474 }
475
476
477 module_init(smu_sensors_init);
478 module_exit(smu_sensors_exit);
479
480 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
481 MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control");
482 MODULE_LICENSE("GPL");
483
484
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