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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/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
38
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
48
49
50static LIST_HEAD(smu_ads);
51
52struct smu_ad_sensor {
53 struct list_head link;
54 u32 reg;
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_ONSTACK(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
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
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
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
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 const char *c, *l;
201 const u32 *v;
202
203 ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
204 if (ads == NULL)
205 return NULL;
206 c = of_get_property(node, "device_type", NULL);
207 l = of_get_property(node, "location", NULL);
208 if (c == NULL || l == NULL)
209 goto fail;
210
211
212
213
214
215
216
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 if (cpudiode == NULL) {
223 DBG("wf: cpudiode partition (%02x) not found\n",
224 SMU_SDB_CPUDIODE_ID);
225 goto fail;
226 }
227 } else if (!strcmp(c, "current-sensor") &&
228 !strcmp(l, "CPU Current")) {
229 ads->sens.ops = &smu_cpuamp_ops;
230 ads->sens.name = "cpu-current";
231 if (cpuvcp == NULL) {
232 DBG("wf: cpuvcp partition (%02x) not found\n",
233 SMU_SDB_CPUVCP_ID);
234 goto fail;
235 }
236 } else if (!strcmp(c, "voltage-sensor") &&
237 !strcmp(l, "CPU Voltage")) {
238 ads->sens.ops = &smu_cpuvolt_ops;
239 ads->sens.name = "cpu-voltage";
240 if (cpuvcp == NULL) {
241 DBG("wf: cpuvcp partition (%02x) not found\n",
242 SMU_SDB_CPUVCP_ID);
243 goto fail;
244 }
245 } else if (!strcmp(c, "power-sensor") &&
246 !strcmp(l, "Slots Power")) {
247 ads->sens.ops = &smu_slotspow_ops;
248 ads->sens.name = "slots-power";
249 if (slotspow == NULL) {
250 DBG("wf: slotspow partition (%02x) not found\n",
251 SMU_SDB_SLOTSPOW_ID);
252 goto fail;
253 }
254 } else
255 goto fail;
256
257 v = of_get_property(node, "reg", NULL);
258 if (v == NULL)
259 goto fail;
260 ads->reg = *v;
261
262 if (wf_register_sensor(&ads->sens))
263 goto fail;
264 return ads;
265 fail:
266 kfree(ads);
267 return NULL;
268}
269
270
271
272
273
274struct smu_cpu_power_sensor {
275 struct list_head link;
276 struct wf_sensor *volts;
277 struct wf_sensor *amps;
278 int fake_volts : 1;
279 int quadratic : 1;
280 struct wf_sensor sens;
281};
282#define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)
283
284static struct smu_cpu_power_sensor *smu_cpu_power;
285
286static void smu_cpu_power_release(struct wf_sensor *sr)
287{
288 struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
289
290 if (pow->volts)
291 wf_put_sensor(pow->volts);
292 if (pow->amps)
293 wf_put_sensor(pow->amps);
294 kfree(pow);
295}
296
297static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value)
298{
299 struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
300 s32 volts, amps, power;
301 u64 tmps, tmpa, tmpb;
302 int rc;
303
304 rc = pow->amps->ops->get_value(pow->amps, &s);
305 if (rc)
306 return rc;
307
308 if (pow->fake_volts) {
309 *value = amps * 12 - 0x30000;
310 return 0;
311 }
312
313 rc = pow->volts->ops->get_value(pow->volts, &volts);
314 if (rc)
315 return rc;
316
317 power = (s32)((((u64)volts) * ((u64)amps)) >> 16);
318 if (!pow->quadratic) {
319 *value = power;
320 return 0;
321 }
322 tmps = (((u64)power) * ((u64)power)) >> 16;
323 tmpa = ((u64)cpuvcp->power_quads[0]) * tmps;
324 tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power);
325 *value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12);
326
327 return 0;
328}
329
330static struct wf_sensor_ops smu_cpu_power_ops = {
331 .get_value = smu_cpu_power_get,
332 .release = smu_cpu_power_release,
333 .owner = THIS_MODULE,
334};
335
336
337static struct smu_cpu_power_sensor *
338smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps)
339{
340 struct smu_cpu_power_sensor *pow;
341
342 pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL);
343 if (pow == NULL)
344 return NULL;
345 pow->sens.ops = &smu_cpu_power_ops;
346 pow->sens.name = "cpu-power";
347
348 wf_get_sensor(volts);
349 pow->volts = volts;
350 wf_get_sensor(amps);
351 pow->amps = amps;
352
353
354 if (debugswitches && ((*debugswitches) & 0x80)) {
355 printk(KERN_INFO "windfarm: CPU Power sensor using faked"
356 " voltage !\n");
357 pow->fake_volts = 1;
358 } else
359 pow->fake_volts = 0;
360
361
362
363
364
365 if ((of_machine_is_compatible("PowerMac8,1") ||
366 of_machine_is_compatible("PowerMac8,2") ||
367 of_machine_is_compatible("PowerMac9,1")) &&
368 cpuvcp_version >= 2) {
369 pow->quadratic = 1;
370 DBG("windfarm: CPU Power using quadratic transform\n");
371 } else
372 pow->quadratic = 0;
373
374 if (wf_register_sensor(&pow->sens))
375 goto fail;
376 return pow;
377 fail:
378 kfree(pow);
379 return NULL;
380}
381
382static void smu_fetch_param_partitions(void)
383{
384 const struct smu_sdbp_header *hdr;
385
386
387 hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
388 if (hdr != NULL) {
389 cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1];
390
391 cpuvcp_version = hdr->version;
392 }
393
394
395 hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL);
396 if (hdr != NULL)
397 cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1];
398
399
400 hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL);
401 if (hdr != NULL)
402 slotspow = (struct smu_sdbp_slotspow *)&hdr[1];
403
404
405 hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL);
406 if (hdr != NULL)
407 debugswitches = (u8 *)&hdr[1];
408}
409
410static int __init smu_sensors_init(void)
411{
412 struct device_node *smu, *sensors, *s;
413 struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL;
414
415 if (!smu_present())
416 return -ENODEV;
417
418
419 smu_fetch_param_partitions();
420
421 smu = of_find_node_by_type(NULL, "smu");
422 if (smu == NULL)
423 return -ENODEV;
424
425
426 for (sensors = NULL;
427 (sensors = of_get_next_child(smu, sensors)) != NULL;)
428 if (!strcmp(sensors->name, "sensors"))
429 break;
430
431 of_node_put(smu);
432
433
434 for (s = NULL;
435 sensors && (s = of_get_next_child(sensors, s)) != NULL;) {
436 struct smu_ad_sensor *ads;
437
438 ads = smu_ads_create(s);
439 if (ads == NULL)
440 continue;
441 list_add(&ads->link, &smu_ads);
442
443 if (!strcmp(ads->sens.name, "cpu-voltage"))
444 volt_sensor = ads;
445 else if (!strcmp(ads->sens.name, "cpu-current"))
446 curr_sensor = ads;
447 }
448
449 of_node_put(sensors);
450
451
452 if (volt_sensor && curr_sensor)
453 smu_cpu_power = smu_cpu_power_create(&volt_sensor->sens,
454 &curr_sensor->sens);
455
456 return 0;
457}
458
459static void __exit smu_sensors_exit(void)
460{
461 struct smu_ad_sensor *ads;
462
463
464 if (smu_cpu_power)
465 wf_unregister_sensor(&smu_cpu_power->sens);
466
467
468 while (!list_empty(&smu_ads)) {
469 ads = list_entry(smu_ads.next, struct smu_ad_sensor, link);
470 list_del(&ads->link);
471 wf_unregister_sensor(&ads->sens);
472 }
473}
474
475
476module_init(smu_sensors_init);
477module_exit(smu_sensors_exit);
478
479MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
480MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control");
481MODULE_LICENSE("GPL");
482
483
