Root/drivers/macintosh/windfarm_pm121.c

1/*
2 * Windfarm PowerMac thermal control. iMac G5 iSight
3 *
4 * (c) Copyright 2007 Étienne Bersac <bersace@gmail.com>
5 *
6 * Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin
7 * Herrenschmidt, IBM Corp. <benh@kernel.crashing.org>
8 *
9 * Released under the term of the GNU GPL v2.
10 *
11 *
12 *
13 * PowerMac12,1
14 * ============
15 *
16 *
17 * The algorithm used is the PID control algorithm, used the same way
18 * the published Darwin code does, using the same values that are
19 * present in the Darwin 8.10 snapshot property lists (note however
20 * that none of the code has been re-used, it's a complete
21 * re-implementation
22 *
23 * There is two models using PowerMac12,1. Model 2 is iMac G5 iSight
24 * 17" while Model 3 is iMac G5 20". They do have both the same
25 * controls with a tiny difference. The control-ids of hard-drive-fan
26 * and cpu-fan is swapped.
27 *
28 *
29 * Target Correction :
30 *
31 * controls have a target correction calculated as :
32 *
33 * new_min = ((((average_power * slope) >> 16) + offset) >> 16) + min_value
34 * new_value = max(new_value, max(new_min, 0))
35 *
36 * OD Fan control correction.
37 *
38 * # model_id: 2
39 * offset : -19563152
40 * slope : 1956315
41 *
42 * # model_id: 3
43 * offset : -15650652
44 * slope : 1565065
45 *
46 * HD Fan control correction.
47 *
48 * # model_id: 2
49 * offset : -15650652
50 * slope : 1565065
51 *
52 * # model_id: 3
53 * offset : -19563152
54 * slope : 1956315
55 *
56 * CPU Fan control correction.
57 *
58 * # model_id: 2
59 * offset : -25431900
60 * slope : 2543190
61 *
62 * # model_id: 3
63 * offset : -15650652
64 * slope : 1565065
65 *
66 *
67 * Target rubber-banding :
68 *
69 * Some controls have a target correction which depends on another
70 * control value. The correction is computed in the following way :
71 *
72 * new_min = ref_value * slope + offset
73 *
74 * ref_value is the value of the reference control. If new_min is
75 * greater than 0, then we correct the target value using :
76 *
77 * new_target = max (new_target, new_min >> 16)
78 *
79 *
80 * # model_id : 2
81 * control : cpu-fan
82 * ref : optical-drive-fan
83 * offset : -15650652
84 * slope : 1565065
85 *
86 * # model_id : 3
87 * control : optical-drive-fan
88 * ref : hard-drive-fan
89 * offset : -32768000
90 * slope : 65536
91 *
92 *
93 * In order to have the moste efficient correction with those
94 * dependencies, we must trigger HD loop before OD loop before CPU
95 * loop.
96 *
97 *
98 * The various control loops found in Darwin config file are:
99 *
100 * HD Fan control loop.
101 *
102 * # model_id: 2
103 * control : hard-drive-fan
104 * sensor : hard-drive-temp
105 * PID params : G_d = 0x00000000
106 * G_p = 0x002D70A3
107 * G_r = 0x00019999
108 * History = 2 entries
109 * Input target = 0x370000
110 * Interval = 5s
111 *
112 * # model_id: 3
113 * control : hard-drive-fan
114 * sensor : hard-drive-temp
115 * PID params : G_d = 0x00000000
116 * G_p = 0x002170A3
117 * G_r = 0x00019999
118 * History = 2 entries
119 * Input target = 0x370000
120 * Interval = 5s
121 *
122 * OD Fan control loop.
123 *
124 * # model_id: 2
125 * control : optical-drive-fan
126 * sensor : optical-drive-temp
127 * PID params : G_d = 0x00000000
128 * G_p = 0x001FAE14
129 * G_r = 0x00019999
130 * History = 2 entries
131 * Input target = 0x320000
132 * Interval = 5s
133 *
134 * # model_id: 3
135 * control : optical-drive-fan
136 * sensor : optical-drive-temp
137 * PID params : G_d = 0x00000000
138 * G_p = 0x001FAE14
139 * G_r = 0x00019999
140 * History = 2 entries
141 * Input target = 0x320000
142 * Interval = 5s
143 *
144 * GPU Fan control loop.
145 *
146 * # model_id: 2
147 * control : hard-drive-fan
148 * sensor : gpu-temp
149 * PID params : G_d = 0x00000000
150 * G_p = 0x002A6666
151 * G_r = 0x00019999
152 * History = 2 entries
153 * Input target = 0x5A0000
154 * Interval = 5s
155 *
156 * # model_id: 3
157 * control : cpu-fan
158 * sensor : gpu-temp
159 * PID params : G_d = 0x00000000
160 * G_p = 0x0010CCCC
161 * G_r = 0x00019999
162 * History = 2 entries
163 * Input target = 0x500000
164 * Interval = 5s
165 *
166 * KODIAK (aka northbridge) Fan control loop.
167 *
168 * # model_id: 2
169 * control : optical-drive-fan
170 * sensor : north-bridge-temp
171 * PID params : G_d = 0x00000000
172 * G_p = 0x003BD70A
173 * G_r = 0x00019999
174 * History = 2 entries
175 * Input target = 0x550000
176 * Interval = 5s
177 *
178 * # model_id: 3
179 * control : hard-drive-fan
180 * sensor : north-bridge-temp
181 * PID params : G_d = 0x00000000
182 * G_p = 0x0030F5C2
183 * G_r = 0x00019999
184 * History = 2 entries
185 * Input target = 0x550000
186 * Interval = 5s
187 *
188 * CPU Fan control loop.
189 *
190 * control : cpu-fan
191 * sensors : cpu-temp, cpu-power
192 * PID params : from SDB partition
193 *
194 *
195 * CPU Slew control loop.
196 *
197 * control : cpufreq-clamp
198 * sensor : cpu-temp
199 *
200 */
201
202#undef DEBUG
203
204#include <linux/types.h>
205#include <linux/errno.h>
206#include <linux/kernel.h>
207#include <linux/delay.h>
208#include <linux/slab.h>
209#include <linux/init.h>
210#include <linux/spinlock.h>
211#include <linux/wait.h>
212#include <linux/kmod.h>
213#include <linux/device.h>
214#include <linux/platform_device.h>
215#include <asm/prom.h>
216#include <asm/machdep.h>
217#include <asm/io.h>
218#include <asm/sections.h>
219#include <asm/smu.h>
220
221#include "windfarm.h"
222#include "windfarm_pid.h"
223
224#define VERSION "0.3"
225
226static int pm121_mach_model; /* machine model id */
227
228/* Controls & sensors */
229static struct wf_sensor *sensor_cpu_power;
230static struct wf_sensor *sensor_cpu_temp;
231static struct wf_sensor *sensor_cpu_voltage;
232static struct wf_sensor *sensor_cpu_current;
233static struct wf_sensor *sensor_gpu_temp;
234static struct wf_sensor *sensor_north_bridge_temp;
235static struct wf_sensor *sensor_hard_drive_temp;
236static struct wf_sensor *sensor_optical_drive_temp;
237static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */
238
239enum {
240    FAN_CPU,
241    FAN_HD,
242    FAN_OD,
243    CPUFREQ,
244    N_CONTROLS
245};
246static struct wf_control *controls[N_CONTROLS] = {};
247
248/* Set to kick the control loop into life */
249static int pm121_all_controls_ok, pm121_all_sensors_ok, pm121_started;
250
251enum {
252    FAILURE_FAN = 1 << 0,
253    FAILURE_SENSOR = 1 << 1,
254    FAILURE_OVERTEMP = 1 << 2
255};
256
257/* All sys loops. Note the HD before the OD loop in order to have it
258   run before. */
259enum {
260    LOOP_GPU, /* control = hd or cpu, but luckily,
261                   it doesn't matter */
262    LOOP_HD, /* control = hd */
263    LOOP_KODIAK, /* control = hd or od */
264    LOOP_OD, /* control = od */
265    N_LOOPS
266};
267
268static const char *loop_names[N_LOOPS] = {
269    "GPU",
270    "HD",
271    "KODIAK",
272    "OD",
273};
274
275#define PM121_NUM_CONFIGS 2
276
277static unsigned int pm121_failure_state;
278static int pm121_readjust, pm121_skipping;
279static s32 average_power;
280
281struct pm121_correction {
282    int offset;
283    int slope;
284};
285
286static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = {
287    /* FAN_OD */
288    {
289        /* MODEL 2 */
290        { .offset = -19563152,
291          .slope = 1956315
292        },
293        /* MODEL 3 */
294        { .offset = -15650652,
295          .slope = 1565065
296        },
297    },
298    /* FAN_HD */
299    {
300        /* MODEL 2 */
301        { .offset = -15650652,
302          .slope = 1565065
303        },
304        /* MODEL 3 */
305        { .offset = -19563152,
306          .slope = 1956315
307        },
308    },
309    /* FAN_CPU */
310    {
311        /* MODEL 2 */
312        { .offset = -25431900,
313          .slope = 2543190
314        },
315        /* MODEL 3 */
316        { .offset = -15650652,
317          .slope = 1565065
318        },
319    },
320    /* CPUFREQ has no correction (and is not implemented at all) */
321};
322
323struct pm121_connection {
324    unsigned int control_id;
325    unsigned int ref_id;
326    struct pm121_correction correction;
327};
328
329static struct pm121_connection pm121_connections[] = {
330    /* MODEL 2 */
331    { .control_id = FAN_CPU,
332      .ref_id = FAN_OD,
333      { .offset = -32768000,
334        .slope = 65536
335      }
336    },
337    /* MODEL 3 */
338    { .control_id = FAN_OD,
339      .ref_id = FAN_HD,
340      { .offset = -32768000,
341        .slope = 65536
342      }
343    },
344};
345
346/* pointer to the current model connection */
347static struct pm121_connection *pm121_connection;
348
349/*
350 * ****** System Fans Control Loop ******
351 *
352 */
353
354/* Since each loop handles only one control and we want to avoid
355 * writing virtual control, we store the control correction with the
356 * loop params. Some data are not set, there are common to all loop
357 * and thus, hardcoded.
358 */
359struct pm121_sys_param {
360    /* purely informative since we use mach_model-2 as index */
361    int model_id;
362    struct wf_sensor **sensor; /* use sensor_id instead ? */
363    s32 gp, itarget;
364    unsigned int control_id;
365};
366
367static struct pm121_sys_param
368pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = {
369    /* GPU Fan control loop */
370    {
371        { .model_id = 2,
372          .sensor = &sensor_gpu_temp,
373          .gp = 0x002A6666,
374          .itarget = 0x5A0000,
375          .control_id = FAN_HD,
376        },
377        { .model_id = 3,
378          .sensor = &sensor_gpu_temp,
379          .gp = 0x0010CCCC,
380          .itarget = 0x500000,
381          .control_id = FAN_CPU,
382        },
383    },
384    /* HD Fan control loop */
385    {
386        { .model_id = 2,
387          .sensor = &sensor_hard_drive_temp,
388          .gp = 0x002D70A3,
389          .itarget = 0x370000,
390          .control_id = FAN_HD,
391        },
392        { .model_id = 3,
393          .sensor = &sensor_hard_drive_temp,
394          .gp = 0x002170A3,
395          .itarget = 0x370000,
396          .control_id = FAN_HD,
397        },
398    },
399    /* KODIAK Fan control loop */
400    {
401        { .model_id = 2,
402          .sensor = &sensor_north_bridge_temp,
403          .gp = 0x003BD70A,
404          .itarget = 0x550000,
405          .control_id = FAN_OD,
406        },
407        { .model_id = 3,
408          .sensor = &sensor_north_bridge_temp,
409          .gp = 0x0030F5C2,
410          .itarget = 0x550000,
411          .control_id = FAN_HD,
412        },
413    },
414    /* OD Fan control loop */
415    {
416        { .model_id = 2,
417          .sensor = &sensor_optical_drive_temp,
418          .gp = 0x001FAE14,
419          .itarget = 0x320000,
420          .control_id = FAN_OD,
421        },
422        { .model_id = 3,
423          .sensor = &sensor_optical_drive_temp,
424          .gp = 0x001FAE14,
425          .itarget = 0x320000,
426          .control_id = FAN_OD,
427        },
428    },
429};
430
431/* the hardcoded values */
432#define PM121_SYS_GD 0x00000000
433#define PM121_SYS_GR 0x00019999
434#define PM121_SYS_HISTORY_SIZE 2
435#define PM121_SYS_INTERVAL 5
436
437/* State data used by the system fans control loop
438 */
439struct pm121_sys_state {
440    int ticks;
441    s32 setpoint;
442    struct wf_pid_state pid;
443};
444
445struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {};
446
447/*
448 * ****** CPU Fans Control Loop ******
449 *
450 */
451
452#define PM121_CPU_INTERVAL 1
453
454/* State data used by the cpu fans control loop
455 */
456struct pm121_cpu_state {
457    int ticks;
458    s32 setpoint;
459    struct wf_cpu_pid_state pid;
460};
461
462static struct pm121_cpu_state *pm121_cpu_state;
463
464
465
466/*
467 * ***** Implementation *****
468 *
469 */
470
471/* correction the value using the output-low-bound correction algo */
472static s32 pm121_correct(s32 new_setpoint,
473             unsigned int control_id,
474             s32 min)
475{
476    s32 new_min;
477    struct pm121_correction *correction;
478    correction = &corrections[control_id][pm121_mach_model - 2];
479
480    new_min = (average_power * correction->slope) >> 16;
481    new_min += correction->offset;
482    new_min = (new_min >> 16) + min;
483
484    return max3(new_setpoint, new_min, 0);
485}
486
487static s32 pm121_connect(unsigned int control_id, s32 setpoint)
488{
489    s32 new_min, value, new_setpoint;
490
491    if (pm121_connection->control_id == control_id) {
492        controls[control_id]->ops->get_value(controls[control_id],
493                             &value);
494        new_min = value * pm121_connection->correction.slope;
495        new_min += pm121_connection->correction.offset;
496        if (new_min > 0) {
497            new_setpoint = max(setpoint, (new_min >> 16));
498            if (new_setpoint != setpoint) {
499                pr_debug("pm121: %s depending on %s, "
500                     "corrected from %d to %d RPM\n",
501                     controls[control_id]->name,
502                     controls[pm121_connection->ref_id]->name,
503                     (int) setpoint, (int) new_setpoint);
504            }
505        } else
506            new_setpoint = setpoint;
507    }
508    /* no connection */
509    else
510        new_setpoint = setpoint;
511
512    return new_setpoint;
513}
514
515/* FAN LOOPS */
516static void pm121_create_sys_fans(int loop_id)
517{
518    struct pm121_sys_param *param = NULL;
519    struct wf_pid_param pid_param;
520    struct wf_control *control = NULL;
521    int i;
522
523    /* First, locate the params for this model */
524    for (i = 0; i < PM121_NUM_CONFIGS; i++) {
525        if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) {
526            param = &(pm121_sys_all_params[loop_id][i]);
527            break;
528        }
529    }
530
531    /* No params found, put fans to max */
532    if (param == NULL) {
533        printk(KERN_WARNING "pm121: %s fan config not found "
534               " for this machine model\n",
535               loop_names[loop_id]);
536        goto fail;
537    }
538
539    control = controls[param->control_id];
540
541    /* Alloc & initialize state */
542    pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state),
543                       GFP_KERNEL);
544    if (pm121_sys_state[loop_id] == NULL) {
545        printk(KERN_WARNING "pm121: Memory allocation error\n");
546        goto fail;
547    }
548    pm121_sys_state[loop_id]->ticks = 1;
549
550    /* Fill PID params */
551    pid_param.gd = PM121_SYS_GD;
552    pid_param.gp = param->gp;
553    pid_param.gr = PM121_SYS_GR;
554    pid_param.interval = PM121_SYS_INTERVAL;
555    pid_param.history_len = PM121_SYS_HISTORY_SIZE;
556    pid_param.itarget = param->itarget;
557    pid_param.min = control->ops->get_min(control);
558    pid_param.max = control->ops->get_max(control);
559
560    wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param);
561
562    pr_debug("pm121: %s Fan control loop initialized.\n"
563         " itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
564         loop_names[loop_id], FIX32TOPRINT(pid_param.itarget),
565         pid_param.min, pid_param.max);
566    return;
567
568 fail:
569    /* note that this is not optimal since another loop may still
570       control the same control */
571    printk(KERN_WARNING "pm121: failed to set up %s loop "
572           "setting \"%s\" to max speed.\n",
573           loop_names[loop_id], control->name);
574
575    if (control)
576        wf_control_set_max(control);
577}
578
579static void pm121_sys_fans_tick(int loop_id)
580{
581    struct pm121_sys_param *param;
582    struct pm121_sys_state *st;
583    struct wf_sensor *sensor;
584    struct wf_control *control;
585    s32 temp, new_setpoint;
586    int rc;
587
588    param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]);
589    st = pm121_sys_state[loop_id];
590    sensor = *(param->sensor);
591    control = controls[param->control_id];
592
593    if (--st->ticks != 0) {
594        if (pm121_readjust)
595            goto readjust;
596        return;
597    }
598    st->ticks = PM121_SYS_INTERVAL;
599
600    rc = sensor->ops->get_value(sensor, &temp);
601    if (rc) {
602        printk(KERN_WARNING "windfarm: %s sensor error %d\n",
603               sensor->name, rc);
604        pm121_failure_state |= FAILURE_SENSOR;
605        return;
606    }
607
608    pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n",
609         loop_names[loop_id], sensor->name,
610         FIX32TOPRINT(temp));
611
612    new_setpoint = wf_pid_run(&st->pid, temp);
613
614    /* correction */
615    new_setpoint = pm121_correct(new_setpoint,
616                     param->control_id,
617                     st->pid.param.min);
618    /* linked corretion */
619    new_setpoint = pm121_connect(param->control_id, new_setpoint);
620
621    if (new_setpoint == st->setpoint)
622        return;
623    st->setpoint = new_setpoint;
624    pr_debug("pm121: %s corrected setpoint: %d RPM\n",
625         control->name, (int)new_setpoint);
626 readjust:
627    if (control && pm121_failure_state == 0) {
628        rc = control->ops->set_value(control, st->setpoint);
629        if (rc) {
630            printk(KERN_WARNING "windfarm: %s fan error %d\n",
631                   control->name, rc);
632            pm121_failure_state |= FAILURE_FAN;
633        }
634    }
635}
636
637
638/* CPU LOOP */
639static void pm121_create_cpu_fans(void)
640{
641    struct wf_cpu_pid_param pid_param;
642    const struct smu_sdbp_header *hdr;
643    struct smu_sdbp_cpupiddata *piddata;
644    struct smu_sdbp_fvt *fvt;
645    struct wf_control *fan_cpu;
646    s32 tmax, tdelta, maxpow, powadj;
647
648    fan_cpu = controls[FAN_CPU];
649
650    /* First, locate the PID params in SMU SBD */
651    hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
652    if (hdr == 0) {
653        printk(KERN_WARNING "pm121: CPU PID fan config not found.\n");
654        goto fail;
655    }
656    piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
657
658    /* Get the FVT params for operating point 0 (the only supported one
659     * for now) in order to get tmax
660     */
661    hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
662    if (hdr) {
663        fvt = (struct smu_sdbp_fvt *)&hdr[1];
664        tmax = ((s32)fvt->maxtemp) << 16;
665    } else
666        tmax = 0x5e0000; /* 94 degree default */
667
668    /* Alloc & initialize state */
669    pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state),
670                  GFP_KERNEL);
671    if (pm121_cpu_state == NULL)
672        goto fail;
673    pm121_cpu_state->ticks = 1;
674
675    /* Fill PID params */
676    pid_param.interval = PM121_CPU_INTERVAL;
677    pid_param.history_len = piddata->history_len;
678    if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
679        printk(KERN_WARNING "pm121: History size overflow on "
680               "CPU control loop (%d)\n", piddata->history_len);
681        pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
682    }
683    pid_param.gd = piddata->gd;
684    pid_param.gp = piddata->gp;
685    pid_param.gr = piddata->gr / pid_param.history_len;
686
687    tdelta = ((s32)piddata->target_temp_delta) << 16;
688    maxpow = ((s32)piddata->max_power) << 16;
689    powadj = ((s32)piddata->power_adj) << 16;
690
691    pid_param.tmax = tmax;
692    pid_param.ttarget = tmax - tdelta;
693    pid_param.pmaxadj = maxpow - powadj;
694
695    pid_param.min = fan_cpu->ops->get_min(fan_cpu);
696    pid_param.max = fan_cpu->ops->get_max(fan_cpu);
697
698    wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param);
699
700    pr_debug("pm121: CPU Fan control initialized.\n");
701    pr_debug(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n",
702         FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
703         pid_param.min, pid_param.max);
704
705    return;
706
707 fail:
708    printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n");
709
710    if (controls[CPUFREQ])
711        wf_control_set_max(controls[CPUFREQ]);
712    if (fan_cpu)
713        wf_control_set_max(fan_cpu);
714}
715
716
717static void pm121_cpu_fans_tick(struct pm121_cpu_state *st)
718{
719    s32 new_setpoint, temp, power;
720    struct wf_control *fan_cpu = NULL;
721    int rc;
722
723    if (--st->ticks != 0) {
724        if (pm121_readjust)
725            goto readjust;
726        return;
727    }
728    st->ticks = PM121_CPU_INTERVAL;
729
730    fan_cpu = controls[FAN_CPU];
731
732    rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
733    if (rc) {
734        printk(KERN_WARNING "pm121: CPU temp sensor error %d\n",
735               rc);
736        pm121_failure_state |= FAILURE_SENSOR;
737        return;
738    }
739
740    rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
741    if (rc) {
742        printk(KERN_WARNING "pm121: CPU power sensor error %d\n",
743               rc);
744        pm121_failure_state |= FAILURE_SENSOR;
745        return;
746    }
747
748    pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n",
749         FIX32TOPRINT(temp), FIX32TOPRINT(power));
750
751    if (temp > st->pid.param.tmax)
752        pm121_failure_state |= FAILURE_OVERTEMP;
753
754    new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
755
756    /* correction */
757    new_setpoint = pm121_correct(new_setpoint,
758                     FAN_CPU,
759                     st->pid.param.min);
760
761    /* connected correction */
762    new_setpoint = pm121_connect(FAN_CPU, new_setpoint);
763
764    if (st->setpoint == new_setpoint)
765        return;
766    st->setpoint = new_setpoint;
767    pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint);
768
769 readjust:
770    if (fan_cpu && pm121_failure_state == 0) {
771        rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint);
772        if (rc) {
773            printk(KERN_WARNING "pm121: %s fan error %d\n",
774                   fan_cpu->name, rc);
775            pm121_failure_state |= FAILURE_FAN;
776        }
777    }
778}
779
780/*
781 * ****** Common ******
782 *
783 */
784
785static void pm121_tick(void)
786{
787    unsigned int last_failure = pm121_failure_state;
788    unsigned int new_failure;
789    s32 total_power;
790    int i;
791
792    if (!pm121_started) {
793        pr_debug("pm121: creating control loops !\n");
794        for (i = 0; i < N_LOOPS; i++)
795            pm121_create_sys_fans(i);
796
797        pm121_create_cpu_fans();
798        pm121_started = 1;
799    }
800
801    /* skipping ticks */
802    if (pm121_skipping && --pm121_skipping)
803        return;
804
805    /* compute average power */
806    total_power = 0;
807    for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++)
808        total_power += pm121_cpu_state->pid.powers[i];
809
810    average_power = total_power / pm121_cpu_state->pid.param.history_len;
811
812
813    pm121_failure_state = 0;
814    for (i = 0 ; i < N_LOOPS; i++) {
815        if (pm121_sys_state[i])
816            pm121_sys_fans_tick(i);
817    }
818
819    if (pm121_cpu_state)
820        pm121_cpu_fans_tick(pm121_cpu_state);
821
822    pm121_readjust = 0;
823    new_failure = pm121_failure_state & ~last_failure;
824
825    /* If entering failure mode, clamp cpufreq and ramp all
826     * fans to full speed.
827     */
828    if (pm121_failure_state && !last_failure) {
829        for (i = 0; i < N_CONTROLS; i++) {
830            if (controls[i])
831                wf_control_set_max(controls[i]);
832        }
833    }
834
835    /* If leaving failure mode, unclamp cpufreq and readjust
836     * all fans on next iteration
837     */
838    if (!pm121_failure_state && last_failure) {
839        if (controls[CPUFREQ])
840            wf_control_set_min(controls[CPUFREQ]);
841        pm121_readjust = 1;
842    }
843
844    /* Overtemp condition detected, notify and start skipping a couple
845     * ticks to let the temperature go down
846     */
847    if (new_failure & FAILURE_OVERTEMP) {
848        wf_set_overtemp();
849        pm121_skipping = 2;
850    }
851
852    /* We only clear the overtemp condition if overtemp is cleared
853     * _and_ no other failure is present. Since a sensor error will
854     * clear the overtemp condition (can't measure temperature) at
855     * the control loop levels, but we don't want to keep it clear
856     * here in this case
857     */
858    if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
859        wf_clear_overtemp();
860}
861
862
863static struct wf_control* pm121_register_control(struct wf_control *ct,
864                         const char *match,
865                         unsigned int id)
866{
867    if (controls[id] == NULL && !strcmp(ct->name, match)) {
868        if (wf_get_control(ct) == 0)
869            controls[id] = ct;
870    }
871    return controls[id];
872}
873
874static void pm121_new_control(struct wf_control *ct)
875{
876    int all = 1;
877
878    if (pm121_all_controls_ok)
879        return;
880
881    all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all;
882    all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all;
883    all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all;
884    all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all;
885
886    if (all)
887        pm121_all_controls_ok = 1;
888}
889
890
891
892
893static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor,
894                           const char *match,
895                           struct wf_sensor **var)
896{
897    if (*var == NULL && !strcmp(sensor->name, match)) {
898        if (wf_get_sensor(sensor) == 0)
899            *var = sensor;
900    }
901    return *var;
902}
903
904static void pm121_new_sensor(struct wf_sensor *sr)
905{
906    int all = 1;
907
908    if (pm121_all_sensors_ok)
909        return;
910
911    all = pm121_register_sensor(sr, "cpu-temp",
912                    &sensor_cpu_temp) && all;
913    all = pm121_register_sensor(sr, "cpu-current",
914                    &sensor_cpu_current) && all;
915    all = pm121_register_sensor(sr, "cpu-voltage",
916                    &sensor_cpu_voltage) && all;
917    all = pm121_register_sensor(sr, "cpu-power",
918                    &sensor_cpu_power) && all;
919    all = pm121_register_sensor(sr, "hard-drive-temp",
920                    &sensor_hard_drive_temp) && all;
921    all = pm121_register_sensor(sr, "optical-drive-temp",
922                    &sensor_optical_drive_temp) && all;
923    all = pm121_register_sensor(sr, "incoming-air-temp",
924                    &sensor_incoming_air_temp) && all;
925    all = pm121_register_sensor(sr, "north-bridge-temp",
926                    &sensor_north_bridge_temp) && all;
927    all = pm121_register_sensor(sr, "gpu-temp",
928                    &sensor_gpu_temp) && all;
929
930    if (all)
931        pm121_all_sensors_ok = 1;
932}
933
934
935
936static int pm121_notify(struct notifier_block *self,
937            unsigned long event, void *data)
938{
939    switch (event) {
940    case WF_EVENT_NEW_CONTROL:
941        pr_debug("pm121: new control %s detected\n",
942             ((struct wf_control *)data)->name);
943        pm121_new_control(data);
944        break;
945    case WF_EVENT_NEW_SENSOR:
946        pr_debug("pm121: new sensor %s detected\n",
947             ((struct wf_sensor *)data)->name);
948        pm121_new_sensor(data);
949        break;
950    case WF_EVENT_TICK:
951        if (pm121_all_controls_ok && pm121_all_sensors_ok)
952            pm121_tick();
953        break;
954    }
955
956    return 0;
957}
958
959static struct notifier_block pm121_events = {
960    .notifier_call = pm121_notify,
961};
962
963static int pm121_init_pm(void)
964{
965    const struct smu_sdbp_header *hdr;
966
967    hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
968    if (hdr != 0) {
969        struct smu_sdbp_sensortree *st =
970            (struct smu_sdbp_sensortree *)&hdr[1];
971        pm121_mach_model = st->model_id;
972    }
973
974    pm121_connection = &pm121_connections[pm121_mach_model - 2];
975
976    printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n",
977           pm121_mach_model);
978
979    return 0;
980}
981
982
983static int pm121_probe(struct platform_device *ddev)
984{
985    wf_register_client(&pm121_events);
986
987    return 0;
988}
989
990static int __devexit pm121_remove(struct platform_device *ddev)
991{
992    wf_unregister_client(&pm121_events);
993    return 0;
994}
995
996static struct platform_driver pm121_driver = {
997    .probe = pm121_probe,
998    .remove = __devexit_p(pm121_remove),
999    .driver = {
1000        .name = "windfarm",
1001        .bus = &platform_bus_type,
1002    },
1003};
1004
1005
1006static int __init pm121_init(void)
1007{
1008    int rc = -ENODEV;
1009
1010    if (of_machine_is_compatible("PowerMac12,1"))
1011        rc = pm121_init_pm();
1012
1013    if (rc == 0) {
1014        request_module("windfarm_smu_controls");
1015        request_module("windfarm_smu_sensors");
1016        request_module("windfarm_smu_sat");
1017        request_module("windfarm_lm75_sensor");
1018        request_module("windfarm_max6690_sensor");
1019        request_module("windfarm_cpufreq_clamp");
1020        platform_driver_register(&pm121_driver);
1021    }
1022
1023    return rc;
1024}
1025
1026static void __exit pm121_exit(void)
1027{
1028
1029    platform_driver_unregister(&pm121_driver);
1030}
1031
1032
1033module_init(pm121_init);
1034module_exit(pm121_exit);
1035
1036MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>");
1037MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");
1038MODULE_LICENSE("GPL");
1039
1040

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