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9#include <linux/types.h>
10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/delay.h>
13#include <linux/slab.h>
14#include <linux/init.h>
15#include <linux/wait.h>
16#include <linux/completion.h>
17#include <asm/prom.h>
18#include <asm/machdep.h>
19#include <asm/io.h>
20#include <asm/sections.h>
21#include <asm/smu.h>
22
23#include "windfarm.h"
24
25#define VERSION "0.2"
26
27#undef DEBUG
28
29#ifdef DEBUG
30#define DBG(args...) printk(args)
31#else
32#define DBG(args...) do { } while(0)
33#endif
34
35
36
37
38
39static struct smu_sdbp_cpuvcp *cpuvcp;
40static int cpuvcp_version;
41static struct smu_sdbp_cpudiode *cpudiode;
42static struct smu_sdbp_slotspow *slotspow;
43static u8 *debugswitches;
44
45
46
47
48
49static LIST_HEAD(smu_ads);
50
51struct smu_ad_sensor {
52 struct list_head link;
53 u32 reg;
54 struct wf_sensor sens;
55};
56#define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens)
57
58static void smu_ads_release(struct wf_sensor *sr)
59{
60 struct smu_ad_sensor *ads = to_smu_ads(sr);
61
62 kfree(ads);
63}
64
65static int smu_read_adc(u8 id, s32 *value)
66{
67 struct smu_simple_cmd cmd;
68 DECLARE_COMPLETION_ONSTACK(comp);
69 int rc;
70
71 rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1,
72 smu_done_complete, &comp, id);
73 if (rc)
74 return rc;
75 wait_for_completion(&comp);
76 if (cmd.cmd.status != 0)
77 return cmd.cmd.status;
78 if (cmd.cmd.reply_len != 2) {
79 printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n",
80 id, cmd.cmd.reply_len);
81 return -EIO;
82 }
83 *value = *((u16 *)cmd.buffer);
84 return 0;
85}
86
87static int smu_cputemp_get(struct wf_sensor *sr, s32 *value)
88{
89 struct smu_ad_sensor *ads = to_smu_ads(sr);
90 int rc;
91 s32 val;
92 s64 scaled;
93
94 rc = smu_read_adc(ads->reg, &val);
95 if (rc) {
96 printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n",
97 rc);
98 return rc;
99 }
100
101
102 scaled = (s64)(((u64)val) * (u64)cpudiode->m_value);
103 scaled >>= 3;
104 scaled += ((s64)cpudiode->b_value) << 9;
105 *value = (s32)(scaled << 1);
106
107 return 0;
108}
109
110static int smu_cpuamp_get(struct wf_sensor *sr, s32 *value)
111{
112 struct smu_ad_sensor *ads = to_smu_ads(sr);
113 s32 val, scaled;
114 int rc;
115
116 rc = smu_read_adc(ads->reg, &val);
117 if (rc) {
118 printk(KERN_ERR "windfarm: read CPU current failed, err %d\n",
119 rc);
120 return rc;
121 }
122
123
124 scaled = (s32)(val * (u32)cpuvcp->curr_scale);
125 scaled += (s32)cpuvcp->curr_offset;
126 *value = scaled << 4;
127
128 return 0;
129}
130
131static int smu_cpuvolt_get(struct wf_sensor *sr, s32 *value)
132{
133 struct smu_ad_sensor *ads = to_smu_ads(sr);
134 s32 val, scaled;
135 int rc;
136
137 rc = smu_read_adc(ads->reg, &val);
138 if (rc) {
139 printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n",
140 rc);
141 return rc;
142 }
143
144
145 scaled = (s32)(val * (u32)cpuvcp->volt_scale);
146 scaled += (s32)cpuvcp->volt_offset;
147 *value = scaled << 4;
148
149 return 0;
150}
151
152static int smu_slotspow_get(struct wf_sensor *sr, s32 *value)
153{
154 struct smu_ad_sensor *ads = to_smu_ads(sr);
155 s32 val, scaled;
156 int rc;
157
158 rc = smu_read_adc(ads->reg, &val);
159 if (rc) {
160 printk(KERN_ERR "windfarm: read slots power failed, err %d\n",
161 rc);
162 return rc;
163 }
164
165
166 scaled = (s32)(val * (u32)slotspow->pow_scale);
167 scaled += (s32)slotspow->pow_offset;
168 *value = scaled << 4;
169
170 return 0;
171}
172
173
174static const struct wf_sensor_ops smu_cputemp_ops = {
175 .get_value = smu_cputemp_get,
176 .release = smu_ads_release,
177 .owner = THIS_MODULE,
178};
179static const struct wf_sensor_ops smu_cpuamp_ops = {
180 .get_value = smu_cpuamp_get,
181 .release = smu_ads_release,
182 .owner = THIS_MODULE,
183};
184static const struct wf_sensor_ops smu_cpuvolt_ops = {
185 .get_value = smu_cpuvolt_get,
186 .release = smu_ads_release,
187 .owner = THIS_MODULE,
188};
189static const struct wf_sensor_ops smu_slotspow_ops = {
190 .get_value = smu_slotspow_get,
191 .release = smu_ads_release,
192 .owner = THIS_MODULE,
193};
194
195
196static struct smu_ad_sensor *smu_ads_create(struct device_node *node)
197{
198 struct smu_ad_sensor *ads;
199 const char *l;
200 const u32 *v;
201
202 ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
203 if (ads == NULL)
204 return NULL;
205 l = of_get_property(node, "location", NULL);
206 if (l == NULL)
207 goto fail;
208
209
210
211
212
213
214
215
216 if (of_node_is_type(node, "temp-sensor") &&
217 !strcmp(l, "CPU T-Diode")) {
218 ads->sens.ops = &smu_cputemp_ops;
219 ads->sens.name = "cpu-temp";
220 if (cpudiode == NULL) {
221 DBG("wf: cpudiode partition (%02x) not found\n",
222 SMU_SDB_CPUDIODE_ID);
223 goto fail;
224 }
225 } else if (of_node_is_type(node, "current-sensor") &&
226 !strcmp(l, "CPU Current")) {
227 ads->sens.ops = &smu_cpuamp_ops;
228 ads->sens.name = "cpu-current";
229 if (cpuvcp == NULL) {
230 DBG("wf: cpuvcp partition (%02x) not found\n",
231 SMU_SDB_CPUVCP_ID);
232 goto fail;
233 }
234 } else if (of_node_is_type(node, "voltage-sensor") &&
235 !strcmp(l, "CPU Voltage")) {
236 ads->sens.ops = &smu_cpuvolt_ops;
237 ads->sens.name = "cpu-voltage";
238 if (cpuvcp == NULL) {
239 DBG("wf: cpuvcp partition (%02x) not found\n",
240 SMU_SDB_CPUVCP_ID);
241 goto fail;
242 }
243 } else if (of_node_is_type(node, "power-sensor") &&
244 !strcmp(l, "Slots Power")) {
245 ads->sens.ops = &smu_slotspow_ops;
246 ads->sens.name = "slots-power";
247 if (slotspow == NULL) {
248 DBG("wf: slotspow partition (%02x) not found\n",
249 SMU_SDB_SLOTSPOW_ID);
250 goto fail;
251 }
252 } else
253 goto fail;
254
255 v = of_get_property(node, "reg", NULL);
256 if (v == NULL)
257 goto fail;
258 ads->reg = *v;
259
260 if (wf_register_sensor(&ads->sens))
261 goto fail;
262 return ads;
263 fail:
264 kfree(ads);
265 return NULL;
266}
267
268
269
270
271
272struct smu_cpu_power_sensor {
273 struct list_head link;
274 struct wf_sensor *volts;
275 struct wf_sensor *amps;
276 int fake_volts : 1;
277 int quadratic : 1;
278 struct wf_sensor sens;
279};
280#define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)
281
282static struct smu_cpu_power_sensor *smu_cpu_power;
283
284static void smu_cpu_power_release(struct wf_sensor *sr)
285{
286 struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
287
288 if (pow->volts)
289 wf_put_sensor(pow->volts);
290 if (pow->amps)
291 wf_put_sensor(pow->amps);
292 kfree(pow);
293}
294
295static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value)
296{
297 struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
298 s32 volts, amps, power;
299 u64 tmps, tmpa, tmpb;
300 int rc;
301
302 rc = pow->amps->ops->get_value(pow->amps, &s);
303 if (rc)
304 return rc;
305
306 if (pow->fake_volts) {
307 *value = amps * 12 - 0x30000;
308 return 0;
309 }
310
311 rc = pow->volts->ops->get_value(pow->volts, &volts);
312 if (rc)
313 return rc;
314
315 power = (s32)((((u64)volts) * ((u64)amps)) >> 16);
316 if (!pow->quadratic) {
317 *value = power;
318 return 0;
319 }
320 tmps = (((u64)power) * ((u64)power)) >> 16;
321 tmpa = ((u64)cpuvcp->power_quads[0]) * tmps;
322 tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power);
323 *value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12);
324
325 return 0;
326}
327
328static const struct wf_sensor_ops smu_cpu_power_ops = {
329 .get_value = smu_cpu_power_get,
330 .release = smu_cpu_power_release,
331 .owner = THIS_MODULE,
332};
333
334
335static struct smu_cpu_power_sensor *
336smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps)
337{
338 struct smu_cpu_power_sensor *pow;
339
340 pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL);
341 if (pow == NULL)
342 return NULL;
343 pow->sens.ops = &smu_cpu_power_ops;
344 pow->sens.name = "cpu-power";
345
346 wf_get_sensor(volts);
347 pow->volts = volts;
348 wf_get_sensor(amps);
349 pow->amps = amps;
350
351
352 if (debugswitches && ((*debugswitches) & 0x80)) {
353 printk(KERN_INFO "windfarm: CPU Power sensor using faked"
354 " voltage !\n");
355 pow->fake_volts = 1;
356 } else
357 pow->fake_volts = 0;
358
359
360
361
362
363 if ((of_machine_is_compatible("PowerMac8,1") ||
364 of_machine_is_compatible("PowerMac8,2") ||
365 of_machine_is_compatible("PowerMac9,1")) &&
366 cpuvcp_version >= 2) {
367 pow->quadratic = 1;
368 DBG("windfarm: CPU Power using quadratic transform\n");
369 } else
370 pow->quadratic = 0;
371
372 if (wf_register_sensor(&pow->sens))
373 goto fail;
374 return pow;
375 fail:
376 kfree(pow);
377 return NULL;
378}
379
380static void smu_fetch_param_partitions(void)
381{
382 const struct smu_sdbp_header *hdr;
383
384
385 hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
386 if (hdr != NULL) {
387 cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1];
388
389 cpuvcp_version = hdr->version;
390 }
391
392
393 hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL);
394 if (hdr != NULL)
395 cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1];
396
397
398 hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL);
399 if (hdr != NULL)
400 slotspow = (struct smu_sdbp_slotspow *)&hdr[1];
401
402
403 hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL);
404 if (hdr != NULL)
405 debugswitches = (u8 *)&hdr[1];
406}
407
408static int __init smu_sensors_init(void)
409{
410 struct device_node *smu, *sensors, *s;
411 struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL;
412
413 if (!smu_present())
414 return -ENODEV;
415
416
417 smu_fetch_param_partitions();
418
419 smu = of_find_node_by_type(NULL, "smu");
420 if (smu == NULL)
421 return -ENODEV;
422
423
424 for_each_child_of_node(smu, sensors)
425 if (of_node_name_eq(sensors, "sensors"))
426 break;
427
428 of_node_put(smu);
429
430
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
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
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
461 if (smu_cpu_power)
462 wf_unregister_sensor(&smu_cpu_power->sens);
463
464
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
480
