Merge branch 'kvm-ppc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus...
[platform/kernel/linux-exynos.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/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  */
40 static struct smu_sdbp_cpuvcp *cpuvcp;
41 static int  cpuvcp_version;
42 static struct smu_sdbp_cpudiode *cpudiode;
43 static struct smu_sdbp_slotspow *slotspow;
44 static u8 *debugswitches;
45
46 /*
47  * SMU basic sensors objects
48  */
49
50 static LIST_HEAD(smu_ads);
51
52 struct 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
59 static 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
66 static 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
88 static 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
111 static 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
132 static 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
153 static 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
175 static const struct wf_sensor_ops smu_cputemp_ops = {
176         .get_value      = smu_cputemp_get,
177         .release        = smu_ads_release,
178         .owner          = THIS_MODULE,
179 };
180 static const struct wf_sensor_ops smu_cpuamp_ops = {
181         .get_value      = smu_cpuamp_get,
182         .release        = smu_ads_release,
183         .owner          = THIS_MODULE,
184 };
185 static const struct wf_sensor_ops smu_cpuvolt_ops = {
186         .get_value      = smu_cpuvolt_get,
187         .release        = smu_ads_release,
188         .owner          = THIS_MODULE,
189 };
190 static const 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
197 static 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         /* 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                 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  * SMU Power combo sensor object
272  */
273
274 struct 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
284 static struct smu_cpu_power_sensor *smu_cpu_power;
285
286 static 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
297 static 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, &amps);
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
330 static const 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
337 static struct smu_cpu_power_sensor *
338 smu_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         /* Some early machines need a faked voltage */
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         /* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now,
362          * I yet have to figure out what's up with 8,2 and will have to
363          * adjust for later, unless we can 100% trust the SDB partition...
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
382 static void smu_fetch_param_partitions(void)
383 {
384         const struct smu_sdbp_header *hdr;
385
386         /* Get CPU voltage/current/power calibration data */
387         hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
388         if (hdr != NULL) {
389                 cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1];
390                 /* Keep version around */
391                 cpuvcp_version = hdr->version;
392         }
393
394         /* Get CPU diode calibration data */
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         /* Get slots power calibration data if any */
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         /* Get debug switches if any */
405         hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL);
406         if (hdr != NULL)
407                 debugswitches = (u8 *)&hdr[1];
408 }
409
410 static 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         /* Get parameters partitions */
419         smu_fetch_param_partitions();
420
421         smu = of_find_node_by_type(NULL, "smu");
422         if (smu == NULL)
423                 return -ENODEV;
424
425         /* Look for sensors subdir */
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         /* Create basic sensors */
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                 /* keep track of cpu voltage & current */
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         /* Create CPU power sensor if possible */
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
459 static void __exit smu_sensors_exit(void)
460 {
461         struct smu_ad_sensor *ads;
462
463         /* dispose of power sensor */
464         if (smu_cpu_power)
465                 wf_unregister_sensor(&smu_cpu_power->sens);
466
467         /* dispose of basic sensors */
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
476 module_init(smu_sensors_init);
477 module_exit(smu_sensors_exit);
478
479 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
480 MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control");
481 MODULE_LICENSE("GPL");
482