2 * Windfarm PowerMac thermal control. SMU based sensors
4 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
5 * <benh@kernel.crashing.org>
7 * Released under the term of the GNU GPL v2.
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>
19 #include <asm/machdep.h>
21 #include <asm/system.h>
22 #include <asm/sections.h>
32 #define DBG(args...) printk(args)
34 #define DBG(args...) do { } while(0)
38 * Various SMU "partitions" calibration objects for which we
39 * keep pointers here for use by bits & pieces of the driver
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
;
48 * SMU basic sensors objects
51 static LIST_HEAD(smu_ads
);
53 struct smu_ad_sensor
{
54 struct list_head link
;
55 u32 reg
; /* index in SMU */
56 struct wf_sensor sens
;
58 #define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens)
60 static void smu_ads_release(struct wf_sensor
*sr
)
62 struct smu_ad_sensor
*ads
= to_smu_ads(sr
);
67 static int smu_read_adc(u8 id
, s32
*value
)
69 struct smu_simple_cmd cmd
;
70 DECLARE_COMPLETION(comp
);
73 rc
= smu_queue_simple(&cmd
, SMU_CMD_READ_ADC
, 1,
74 smu_done_complete
, &comp
, id
);
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
);
85 *value
= *((u16
*)cmd
.buffer
);
89 static int smu_cputemp_get(struct wf_sensor
*sr
, s32
*value
)
91 struct smu_ad_sensor
*ads
= to_smu_ads(sr
);
96 rc
= smu_read_adc(ads
->reg
, &val
);
98 printk(KERN_ERR
"windfarm: read CPU temp failed, err %d\n",
103 /* Ok, we have to scale & adjust, taking units into account */
104 scaled
= (s64
)(((u64
)val
) * (u64
)cpudiode
->m_value
);
106 scaled
+= ((s64
)cpudiode
->b_value
) << 9;
107 *value
= (s32
)(scaled
<< 1);
112 static int smu_cpuamp_get(struct wf_sensor
*sr
, s32
*value
)
114 struct smu_ad_sensor
*ads
= to_smu_ads(sr
);
118 rc
= smu_read_adc(ads
->reg
, &val
);
120 printk(KERN_ERR
"windfarm: read CPU current failed, err %d\n",
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;
133 static int smu_cpuvolt_get(struct wf_sensor
*sr
, s32
*value
)
135 struct smu_ad_sensor
*ads
= to_smu_ads(sr
);
139 rc
= smu_read_adc(ads
->reg
, &val
);
141 printk(KERN_ERR
"windfarm: read CPU voltage failed, err %d\n",
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;
154 static int smu_slotspow_get(struct wf_sensor
*sr
, s32
*value
)
156 struct smu_ad_sensor
*ads
= to_smu_ads(sr
);
160 rc
= smu_read_adc(ads
->reg
, &val
);
162 printk(KERN_ERR
"windfarm: read slots power failed, err %d\n",
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;
176 static struct wf_sensor_ops smu_cputemp_ops
= {
177 .get_value
= smu_cputemp_get
,
178 .release
= smu_ads_release
,
179 .owner
= THIS_MODULE
,
181 static struct wf_sensor_ops smu_cpuamp_ops
= {
182 .get_value
= smu_cpuamp_get
,
183 .release
= smu_ads_release
,
184 .owner
= THIS_MODULE
,
186 static struct wf_sensor_ops smu_cpuvolt_ops
= {
187 .get_value
= smu_cpuvolt_get
,
188 .release
= smu_ads_release
,
189 .owner
= THIS_MODULE
,
191 static struct wf_sensor_ops smu_slotspow_ops
= {
192 .get_value
= smu_slotspow_get
,
193 .release
= smu_ads_release
,
194 .owner
= THIS_MODULE
,
198 static struct smu_ad_sensor
*smu_ads_create(struct device_node
*node
)
200 struct smu_ad_sensor
*ads
;
204 ads
= kmalloc(sizeof(struct smu_ad_sensor
), GFP_KERNEL
);
207 c
= (char *)get_property(node
, "device_type", NULL
);
208 l
= (char *)get_property(node
, "location", NULL
);
209 if (c
== NULL
|| l
== NULL
)
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.
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 } else if (!strcmp(c
, "current-sensor") &&
224 !strcmp(l
, "CPU Current")) {
225 ads
->sens
.ops
= &smu_cpuamp_ops
;
226 ads
->sens
.name
= "cpu-current";
227 } else if (!strcmp(c
, "voltage-sensor") &&
228 !strcmp(l
, "CPU Voltage")) {
229 ads
->sens
.ops
= &smu_cpuvolt_ops
;
230 ads
->sens
.name
= "cpu-voltage";
231 } else if (!strcmp(c
, "power-sensor") &&
232 !strcmp(l
, "Slots Power")) {
233 ads
->sens
.ops
= &smu_slotspow_ops
;
234 ads
->sens
.name
= "slots-power";
235 if (slotspow
== NULL
) {
236 DBG("wf: slotspow partition (%02x) not found\n",
237 SMU_SDB_SLOTSPOW_ID
);
243 v
= (u32
*)get_property(node
, "reg", NULL
);
248 if (wf_register_sensor(&ads
->sens
))
257 * SMU Power combo sensor object
260 struct smu_cpu_power_sensor
{
261 struct list_head link
;
262 struct wf_sensor
*volts
;
263 struct wf_sensor
*amps
;
266 struct wf_sensor sens
;
268 #define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)
270 static struct smu_cpu_power_sensor
*smu_cpu_power
;
272 static void smu_cpu_power_release(struct wf_sensor
*sr
)
274 struct smu_cpu_power_sensor
*pow
= to_smu_cpu_power(sr
);
277 wf_put_sensor(pow
->volts
);
279 wf_put_sensor(pow
->amps
);
283 static int smu_cpu_power_get(struct wf_sensor
*sr
, s32
*value
)
285 struct smu_cpu_power_sensor
*pow
= to_smu_cpu_power(sr
);
286 s32 volts
, amps
, power
;
287 u64 tmps
, tmpa
, tmpb
;
290 rc
= pow
->amps
->ops
->get_value(pow
->amps
, &s
);
294 if (pow
->fake_volts
) {
295 *value
= amps
* 12 - 0x30000;
299 rc
= pow
->volts
->ops
->get_value(pow
->volts
, &volts
);
303 power
= (s32
)((((u64
)volts
) * ((u64
)amps
)) >> 16);
304 if (!pow
->quadratic
) {
308 tmps
= (((u64
)power
) * ((u64
)power
)) >> 16;
309 tmpa
= ((u64
)cpuvcp
->power_quads
[0]) * tmps
;
310 tmpb
= ((u64
)cpuvcp
->power_quads
[1]) * ((u64
)power
);
311 *value
= (tmpa
>> 28) + (tmpb
>> 28) + (cpuvcp
->power_quads
[2] >> 12);
316 static struct wf_sensor_ops smu_cpu_power_ops
= {
317 .get_value
= smu_cpu_power_get
,
318 .release
= smu_cpu_power_release
,
319 .owner
= THIS_MODULE
,
323 static struct smu_cpu_power_sensor
*
324 smu_cpu_power_create(struct wf_sensor
*volts
, struct wf_sensor
*amps
)
326 struct smu_cpu_power_sensor
*pow
;
328 pow
= kmalloc(sizeof(struct smu_cpu_power_sensor
), GFP_KERNEL
);
331 pow
->sens
.ops
= &smu_cpu_power_ops
;
332 pow
->sens
.name
= "cpu-power";
334 wf_get_sensor(volts
);
339 /* Some early machines need a faked voltage */
340 if (debugswitches
&& ((*debugswitches
) & 0x80)) {
341 printk(KERN_INFO
"windfarm: CPU Power sensor using faked"
347 /* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now,
348 * I yet have to figure out what's up with 8,2 and will have to
349 * adjust for later, unless we can 100% trust the SDB partition...
351 if ((machine_is_compatible("PowerMac8,1") ||
352 machine_is_compatible("PowerMac8,2") ||
353 machine_is_compatible("PowerMac9,1")) &&
354 cpuvcp_version
>= 2) {
356 DBG("windfarm: CPU Power using quadratic transform\n");
360 if (wf_register_sensor(&pow
->sens
))
368 static int smu_fetch_param_partitions(void)
370 struct smu_sdbp_header
*hdr
;
372 /* Get CPU voltage/current/power calibration data */
373 hdr
= smu_get_sdb_partition(SMU_SDB_CPUVCP_ID
, NULL
);
375 DBG("wf: cpuvcp partition (%02x) not found\n",
379 cpuvcp
= (struct smu_sdbp_cpuvcp
*)&hdr
[1];
380 /* Keep version around */
381 cpuvcp_version
= hdr
->version
;
383 /* Get CPU diode calibration data */
384 hdr
= smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID
, NULL
);
386 DBG("wf: cpudiode partition (%02x) not found\n",
387 SMU_SDB_CPUDIODE_ID
);
390 cpudiode
= (struct smu_sdbp_cpudiode
*)&hdr
[1];
392 /* Get slots power calibration data if any */
393 hdr
= smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID
, NULL
);
395 slotspow
= (struct smu_sdbp_slotspow
*)&hdr
[1];
397 /* Get debug switches if any */
398 hdr
= smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID
, NULL
);
400 debugswitches
= (u8
*)&hdr
[1];
405 static int __init
smu_sensors_init(void)
407 struct device_node
*smu
, *sensors
, *s
;
408 struct smu_ad_sensor
*volt_sensor
= NULL
, *curr_sensor
= NULL
;
414 /* Get parameters partitions */
415 rc
= smu_fetch_param_partitions();
419 smu
= of_find_node_by_type(NULL
, "smu");
423 /* Look for sensors subdir */
425 (sensors
= of_get_next_child(smu
, sensors
)) != NULL
;)
426 if (!strcmp(sensors
->name
, "sensors"))
431 /* Create basic sensors */
433 sensors
&& (s
= of_get_next_child(sensors
, s
)) != NULL
;) {
434 struct smu_ad_sensor
*ads
;
436 ads
= smu_ads_create(s
);
439 list_add(&ads
->link
, &smu_ads
);
440 /* keep track of cpu voltage & current */
441 if (!strcmp(ads
->sens
.name
, "cpu-voltage"))
443 else if (!strcmp(ads
->sens
.name
, "cpu-current"))
447 of_node_put(sensors
);
449 /* Create CPU power sensor if possible */
450 if (volt_sensor
&& curr_sensor
)
451 smu_cpu_power
= smu_cpu_power_create(&volt_sensor
->sens
,
457 static void __exit
smu_sensors_exit(void)
459 struct smu_ad_sensor
*ads
;
461 /* dispose of power sensor */
463 wf_unregister_sensor(&smu_cpu_power
->sens
);
465 /* dispose of basic sensors */
466 while (!list_empty(&smu_ads
)) {
467 ads
= list_entry(smu_ads
.next
, struct smu_ad_sensor
, link
);
468 list_del(&ads
->link
);
469 wf_unregister_sensor(&ads
->sens
);
474 module_init(smu_sensors_init
);
475 module_exit(smu_sensors_exit
);
477 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
478 MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control");
479 MODULE_LICENSE("GPL");