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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2005-11-07 00:08:17 -0500
committerPaul Mackerras <paulus@samba.org>2005-11-07 19:17:56 -0500
commit75722d3992f57375c0cc029dcceb2334a45ceff1 (patch)
treed3f63b3ea80790c2f29ea435781c1331f17d269e /drivers/macintosh/windfarm_smu_sensors.c
parent7d49697ef92bd2cf84ab53bd4cea82fefb197fb9 (diff)
[PATCH] ppc64: Thermal control for SMU based machines
This adds a new thermal control framework for PowerMac, along with the implementation for PowerMac8,1, PowerMac8,2 (iMac G5 rev 1 and 2), and PowerMac9,1 (latest single CPU desktop). In the future, I expect to move the older G5 thermal control to the new framework as well. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/macintosh/windfarm_smu_sensors.c')
-rw-r--r--drivers/macintosh/windfarm_smu_sensors.c479
1 files changed, 479 insertions, 0 deletions
diff --git a/drivers/macintosh/windfarm_smu_sensors.c b/drivers/macintosh/windfarm_smu_sensors.c
new file mode 100644
index 00000000000..b558cc209d4
--- /dev/null
+++ b/drivers/macintosh/windfarm_smu_sensors.c
@@ -0,0 +1,479 @@
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 <asm/prom.h>
18#include <asm/machdep.h>
19#include <asm/io.h>
20#include <asm/system.h>
21#include <asm/sections.h>
22#include <asm/smu.h>
23
24#include "windfarm.h"
25
26#define VERSION "0.2"
27
28#undef DEBUG
29
30#ifdef DEBUG
31#define DBG(args...) printk(args)
32#else
33#define DBG(args...) do { } while(0)
34#endif
35
36/*
37 * Various SMU "partitions" calibration objects for which we
38 * keep pointers here for use by bits & pieces of the driver
39 */
40static struct smu_sdbp_cpuvcp *cpuvcp;
41static int cpuvcp_version;
42static struct smu_sdbp_cpudiode *cpudiode;
43static struct smu_sdbp_slotspow *slotspow;
44static u8 *debugswitches;
45
46/*
47 * SMU basic sensors objects
48 */
49
50static LIST_HEAD(smu_ads);
51
52struct smu_ad_sensor {
53 struct list_head link;
54 u32 reg; /* index in SMU */
55 struct wf_sensor sens;
56};
57#define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens)
58
59static void smu_ads_release(struct wf_sensor *sr)
60{
61 struct smu_ad_sensor *ads = to_smu_ads(sr);
62
63 kfree(ads);
64}
65
66static int smu_read_adc(u8 id, s32 *value)
67{
68 struct smu_simple_cmd cmd;
69 DECLARE_COMPLETION(comp);
70 int rc;
71
72 rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1,
73 smu_done_complete, &comp, id);
74 if (rc)
75 return rc;
76 wait_for_completion(&comp);
77 if (cmd.cmd.status != 0)
78 return cmd.cmd.status;
79 if (cmd.cmd.reply_len != 2) {
80 printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n",
81 id, cmd.cmd.reply_len);
82 return -EIO;
83 }
84 *value = *((u16 *)cmd.buffer);
85 return 0;
86}
87
88static int smu_cputemp_get(struct wf_sensor *sr, s32 *value)
89{
90 struct smu_ad_sensor *ads = to_smu_ads(sr);
91 int rc;
92 s32 val;
93 s64 scaled;
94
95 rc = smu_read_adc(ads->reg, &val);
96 if (rc) {
97 printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n",
98 rc);
99 return rc;
100 }
101
102 /* Ok, we have to scale & adjust, taking units into account */
103 scaled = (s64)(((u64)val) * (u64)cpudiode->m_value);
104 scaled >>= 3;
105 scaled += ((s64)cpudiode->b_value) << 9;
106 *value = (s32)(scaled << 1);
107
108 return 0;
109}
110
111static int smu_cpuamp_get(struct wf_sensor *sr, s32 *value)
112{
113 struct smu_ad_sensor *ads = to_smu_ads(sr);
114 s32 val, scaled;
115 int rc;
116
117 rc = smu_read_adc(ads->reg, &val);
118 if (rc) {
119 printk(KERN_ERR "windfarm: read CPU current failed, err %d\n",
120 rc);
121 return rc;
122 }
123
124 /* Ok, we have to scale & adjust, taking units into account */
125 scaled = (s32)(val * (u32)cpuvcp->curr_scale);
126 scaled += (s32)cpuvcp->curr_offset;
127 *value = scaled << 4;
128
129 return 0;
130}
131
132static int smu_cpuvolt_get(struct wf_sensor *sr, s32 *value)
133{
134 struct smu_ad_sensor *ads = to_smu_ads(sr);
135 s32 val, scaled;
136 int rc;
137
138 rc = smu_read_adc(ads->reg, &val);
139 if (rc) {
140 printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n",
141 rc);
142 return rc;
143 }
144
145 /* Ok, we have to scale & adjust, taking units into account */
146 scaled = (s32)(val * (u32)cpuvcp->volt_scale);
147 scaled += (s32)cpuvcp->volt_offset;
148 *value = scaled << 4;
149
150 return 0;
151}
152
153static int smu_slotspow_get(struct wf_sensor *sr, s32 *value)
154{
155 struct smu_ad_sensor *ads = to_smu_ads(sr);
156 s32 val, scaled;
157 int rc;
158
159 rc = smu_read_adc(ads->reg, &val);
160 if (rc) {
161 printk(KERN_ERR "windfarm: read slots power failed, err %d\n",
162 rc);
163 return rc;
164 }
165
166 /* Ok, we have to scale & adjust, taking units into account */
167 scaled = (s32)(val * (u32)slotspow->pow_scale);
168 scaled += (s32)slotspow->pow_offset;
169 *value = scaled << 4;
170
171 return 0;
172}
173
174
175static struct wf_sensor_ops smu_cputemp_ops = {
176 .get_value = smu_cputemp_get,
177 .release = smu_ads_release,
178 .owner = THIS_MODULE,
179};
180static struct wf_sensor_ops smu_cpuamp_ops = {
181 .get_value = smu_cpuamp_get,
182 .release = smu_ads_release,
183 .owner = THIS_MODULE,
184};
185static struct wf_sensor_ops smu_cpuvolt_ops = {
186 .get_value = smu_cpuvolt_get,
187 .release = smu_ads_release,
188 .owner = THIS_MODULE,
189};
190static struct wf_sensor_ops smu_slotspow_ops = {
191 .get_value = smu_slotspow_get,
192 .release = smu_ads_release,
193 .owner = THIS_MODULE,
194};
195
196
197static struct smu_ad_sensor *smu_ads_create(struct device_node *node)
198{
199 struct smu_ad_sensor *ads;
200 char *c, *l;
201 u32 *v;
202
203 ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
204 if (ads == NULL)
205 return NULL;
206 c = (char *)get_property(node, "device_type", NULL);
207 l = (char *)get_property(node, "location", NULL);
208 if (c == NULL || l == NULL)
209 goto fail;
210
211 /* We currently pick the sensors based on the OF name and location
212 * properties, while Darwin uses the sensor-id's.
213 * The problem with the IDs is that they are model specific while it
214 * looks like apple has been doing a reasonably good job at keeping
215 * the names and locations consistents so I'll stick with the names
216 * and locations for now.
217 */
218 if (!strcmp(c, "temp-sensor") &&
219 !strcmp(l, "CPU T-Diode")) {
220 ads->sens.ops = &smu_cputemp_ops;
221 ads->sens.name = "cpu-temp";
222 } else if (!strcmp(c, "current-sensor") &&
223 !strcmp(l, "CPU Current")) {
224 ads->sens.ops = &smu_cpuamp_ops;
225 ads->sens.name = "cpu-current";
226 } else if (!strcmp(c, "voltage-sensor") &&
227 !strcmp(l, "CPU Voltage")) {
228 ads->sens.ops = &smu_cpuvolt_ops;
229 ads->sens.name = "cpu-voltage";
230 } else if (!strcmp(c, "power-sensor") &&
231 !strcmp(l, "Slots Power")) {
232 ads->sens.ops = &smu_slotspow_ops;
233 ads->sens.name = "slots-power";
234 if (slotspow == NULL) {
235 DBG("wf: slotspow partition (%02x) not found\n",
236 SMU_SDB_SLOTSPOW_ID);
237 goto fail;
238 }
239 } else
240 goto fail;
241
242 v = (u32 *)get_property(node, "reg", NULL);
243 if (v == NULL)
244 goto fail;
245 ads->reg = *v;
246
247 if (wf_register_sensor(&ads->sens))
248 goto fail;
249 return ads;
250 fail:
251 kfree(ads);
252 return NULL;
253}
254
255/*
256 * SMU Power combo sensor object
257 */
258
259struct smu_cpu_power_sensor {
260 struct list_head link;
261 struct wf_sensor *volts;
262 struct wf_sensor *amps;
263 int fake_volts : 1;
264 int quadratic : 1;
265 struct wf_sensor sens;
266};
267#define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)
268
269static struct smu_cpu_power_sensor *smu_cpu_power;
270
271static void smu_cpu_power_release(struct wf_sensor *sr)
272{
273 struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
274
275 if (pow->volts)
276 wf_put_sensor(pow->volts);
277 if (pow->amps)
278 wf_put_sensor(pow->amps);
279 kfree(pow);
280}
281
282static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value)
283{
284 struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
285 s32 volts, amps, power;
286 u64 tmps, tmpa, tmpb;
287 int rc;
288
289 rc = pow->amps->ops->get_value(pow->amps, &amps);
290 if (rc)
291 return rc;
292
293 if (pow->fake_volts) {
294 *value = amps * 12 - 0x30000;
295 return 0;
296 }
297
298 rc = pow->volts->ops->get_value(pow->volts, &volts);
299 if (rc)
300 return rc;
301
302 power = (s32)((((u64)volts) * ((u64)amps)) >> 16);
303 if (!pow->quadratic) {
304 *value = power;
305 return 0;
306 }
307 tmps = (((u64)power) * ((u64)power)) >> 16;
308 tmpa = ((u64)cpuvcp->power_quads[0]) * tmps;
309 tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power);
310 *value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12);
311
312 return 0;
313}
314
315static struct wf_sensor_ops smu_cpu_power_ops = {
316 .get_value = smu_cpu_power_get,
317 .release = smu_cpu_power_release,
318 .owner = THIS_MODULE,
319};
320
321
322static struct smu_cpu_power_sensor *
323smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps)
324{
325 struct smu_cpu_power_sensor *pow;
326
327 pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL);
328 if (pow == NULL)
329 return NULL;
330 pow->sens.ops = &smu_cpu_power_ops;
331 pow->sens.name = "cpu-power";
332
333 wf_get_sensor(volts);
334 pow->volts = volts;
335 wf_get_sensor(amps);
336 pow->amps = amps;
337
338 /* Some early machines need a faked voltage */
339 if (debugswitches && ((*debugswitches) & 0x80)) {
340 printk(KERN_INFO "windfarm: CPU Power sensor using faked"
341 " voltage !\n");
342 pow->fake_volts = 1;
343 } else
344 pow->fake_volts = 0;
345
346 /* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now,
347 * I yet have to figure out what's up with 8,2 and will have to
348 * adjust for later, unless we can 100% trust the SDB partition...
349 */
350 if ((machine_is_compatible("PowerMac8,1") ||
351 machine_is_compatible("PowerMac8,2") ||
352 machine_is_compatible("PowerMac9,1")) &&
353 cpuvcp_version >= 2) {
354 pow->quadratic = 1;
355 DBG("windfarm: CPU Power using quadratic transform\n");
356 } else
357 pow->quadratic = 0;
358
359 if (wf_register_sensor(&pow->sens))
360 goto fail;
361 return pow;
362 fail:
363 kfree(pow);
364 return NULL;
365}
366
367static int smu_fetch_param_partitions(void)
368{
369 struct smu_sdbp_header *hdr;
370
371 /* Get CPU voltage/current/power calibration data */
372 hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
373 if (hdr == NULL) {
374 DBG("wf: cpuvcp partition (%02x) not found\n",
375 SMU_SDB_CPUVCP_ID);
376 return -ENODEV;
377 }
378 cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1];
379 /* Keep version around */
380 cpuvcp_version = hdr->version;
381
382 /* Get CPU diode calibration data */
383 hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL);
384 if (hdr == NULL) {
385 DBG("wf: cpudiode partition (%02x) not found\n",
386 SMU_SDB_CPUDIODE_ID);
387 return -ENODEV;
388 }
389 cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1];
390
391 /* Get slots power calibration data if any */
392 hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL);
393 if (hdr != NULL)
394 slotspow = (struct smu_sdbp_slotspow *)&hdr[1];
395
396 /* Get debug switches if any */
397 hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL);
398 if (hdr != NULL)
399 debugswitches = (u8 *)&hdr[1];
400
401 return 0;
402}
403
404static int __init smu_sensors_init(void)
405{
406 struct device_node *smu, *sensors, *s;
407 struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL;
408 int rc;
409
410 if (!smu_present())
411 return -ENODEV;
412
413 /* Get parameters partitions */
414 rc = smu_fetch_param_partitions();
415 if (rc)
416 return rc;
417
418 smu = of_find_node_by_type(NULL, "smu");
419 if (smu == NULL)
420 return -ENODEV;
421
422 /* Look for sensors subdir */
423 for (sensors = NULL;
424 (sensors = of_get_next_child(smu, sensors)) != NULL;)
425 if (!strcmp(sensors->name, "sensors"))
426 break;
427
428 of_node_put(smu);
429
430 /* Create basic sensors */
431 for (s = NULL;
432 sensors && (s = of_get_next_child(sensors, s)) != NULL;) {
433 struct smu_ad_sensor *ads;
434
435 ads = smu_ads_create(s);
436 if (ads == NULL)
437 continue;
438 list_add(&ads->link, &smu_ads);
439 /* keep track of cpu voltage & current */
440 if (!strcmp(ads->sens.name, "cpu-voltage"))
441 volt_sensor = ads;
442 else if (!strcmp(ads->sens.name, "cpu-current"))
443 curr_sensor = ads;
444 }
445
446 of_node_put(sensors);
447
448 /* Create CPU power sensor if possible */
449 if (volt_sensor && curr_sensor)
450 smu_cpu_power = smu_cpu_power_create(&volt_sensor->sens,
451 &curr_sensor->sens);
452
453 return 0;
454}
455
456static void __exit smu_sensors_exit(void)
457{
458 struct smu_ad_sensor *ads;
459
460 /* dispose of power sensor */
461 if (smu_cpu_power)
462 wf_unregister_sensor(&smu_cpu_power->sens);
463
464 /* dispose of basic sensors */
465 while (!list_empty(&smu_ads)) {
466 ads = list_entry(smu_ads.next, struct smu_ad_sensor, link);
467 list_del(&ads->link);
468 wf_unregister_sensor(&ads->sens);
469 }
470}
471
472
473module_init(smu_sensors_init);
474module_exit(smu_sensors_exit);
475
476MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
477MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control");
478MODULE_LICENSE("GPL");
479