media: soc_camera: tegra: fix one building warning
[linux-2.6.git] / drivers / macintosh / windfarm_smu_sensors.c
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_ONSTACK(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         const char *c, *l;
202         const u32 *v;
203
204         ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
205         if (ads == NULL)
206                 return NULL;
207         c = of_get_property(node, "device_type", NULL);
208         l = of_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 = of_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, &amps);
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 ((of_machine_is_compatible("PowerMac8,1") ||
367              of_machine_is_compatible("PowerMac8,2") ||
368              of_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         const 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