drivers/macintosh/windfarm_pm112.c

   1 /*
   2  * Windfarm PowerMac thermal control.
   3  * Control loops for machines with SMU and PPC970MP processors.
   4  *
   5  * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
   6  * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
   7  *
   8  * Use and redistribute under the terms of the GNU GPL v2.
   9  */
  10 #include <linux/types.h>
  11 #include <linux/errno.h>
  12 #include <linux/kernel.h>
  13 #include <linux/device.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/reboot.h>
  16 #include <linux/slab.h>
  17 #include <asm/prom.h>
  18 #include <asm/smu.h>
  19
  20 #include "windfarm.h"
  21 #include "windfarm_pid.h"
  22
  23 #define VERSION "0.2"
  24
  25 #define DEBUG
  26 #undef LOTSA_DEBUG
  27
  28 #ifdef DEBUG
  29 #define DBG(args...)    printk(args)
  30 #else
  31 #define DBG(args...)    do { } while(0)
  32 #endif
  33
  34 #ifdef LOTSA_DEBUG
  35 #define DBG_LOTS(args...)       printk(args)
  36 #else
  37 #define DBG_LOTS(args...)       do { } while(0)
  38 #endif
  39
  40 /* define this to force CPU overtemp to 60 degree, useful for testing
  41  * the overtemp code
  42  */
  43 #undef HACKED_OVERTEMP
  44
  45 /* We currently only handle 2 chips, 4 cores... */
  46 #define NR_CHIPS        2
  47 #define NR_CORES        4
  48 #define NR_CPU_FANS     3 * NR_CHIPS
  49
  50 /* Controls and sensors */
  51 static struct wf_sensor *sens_cpu_temp[NR_CORES];
  52 static struct wf_sensor *sens_cpu_power[NR_CORES];
  53 static struct wf_sensor *hd_temp;
  54 static struct wf_sensor *slots_power;
  55 static struct wf_sensor *u4_temp;
  56
  57 static struct wf_control *cpu_fans[NR_CPU_FANS];
  58 static char *cpu_fan_names[NR_CPU_FANS] = {
  59         "cpu-rear-fan-0",
  60         "cpu-rear-fan-1",
  61         "cpu-front-fan-0",
  62         "cpu-front-fan-1",
  63         "cpu-pump-0",
  64         "cpu-pump-1",
  65 };
  66 static struct wf_control *cpufreq_clamp;
  67
  68 /* Second pump isn't required (and isn't actually present) */
  69 #define CPU_FANS_REQD           (NR_CPU_FANS - 2)
  70 #define FIRST_PUMP              4
  71 #define LAST_PUMP               5
  72
  73 /* We keep a temperature history for average calculation of 180s */
  74 #define CPU_TEMP_HIST_SIZE      180
  75
  76 /* Scale factor for fan speed, *100 */
  77 static int cpu_fan_scale[NR_CPU_FANS] = {
  78         100,
  79         100,
  80         97,             /* inlet fans run at 97% of exhaust fan */
  81         97,
  82         100,            /* updated later */
  83         100,            /* updated later */
  84 };
  85
  86 static struct wf_control *backside_fan;
  87 static struct wf_control *slots_fan;
  88 static struct wf_control *drive_bay_fan;
  89
  90 /* PID loop state */
  91 static struct wf_cpu_pid_state cpu_pid[NR_CORES];
  92 static u32 cpu_thist[CPU_TEMP_HIST_SIZE];
  93 static int cpu_thist_pt;
  94 static s64 cpu_thist_total;
  95 static s32 cpu_all_tmax = 100 << 16;
  96 static int cpu_last_target;
  97 static struct wf_pid_state backside_pid;
  98 static int backside_tick;
  99 static struct wf_pid_state slots_pid;
 100 static int slots_started;
 101 static struct wf_pid_state drive_bay_pid;
 102 static int drive_bay_tick;
 103
 104 static int nr_cores;
 105 static int have_all_controls;
 106 static int have_all_sensors;
 107 static int started;
 108
 109 static int failure_state;
 110 #define FAILURE_SENSOR          1
 111 #define FAILURE_FAN             2
 112 #define FAILURE_PERM            4
 113 #define FAILURE_LOW_OVERTEMP    8
 114 #define FAILURE_HIGH_OVERTEMP   16
 115
 116 /* Overtemp values */
 117 #define LOW_OVER_AVERAGE        0
 118 #define LOW_OVER_IMMEDIATE      (10 << 16)
 119 #define LOW_OVER_CLEAR          ((-10) << 16)
 120 #define HIGH_OVER_IMMEDIATE     (14 << 16)
 121 #define HIGH_OVER_AVERAGE       (10 << 16)
 122 #define HIGH_OVER_IMMEDIATE     (14 << 16)
 123
 124
 125 /* Implementation... */
 126 static int create_cpu_loop(int cpu)
 127 {
 128         int chip = cpu / 2;
 129         int core = cpu & 1;
 130         struct smu_sdbp_header *hdr;
 131         struct smu_sdbp_cpupiddata *piddata;
 132         struct wf_cpu_pid_param pid;
 133         struct wf_control *main_fan = cpu_fans[0];
 134         s32 tmax;
 135         int fmin;
 136
 137         /* Get FVT params to get Tmax; if not found, assume default */
 138         hdr = smu_sat_get_sdb_partition(chip, 0xC4 + core, NULL);
 139         if (hdr) {
 140                 struct smu_sdbp_fvt *fvt = (struct smu_sdbp_fvt *)&hdr[1];
 141                 tmax = fvt->maxtemp << 16;
 142         } else
 143                 tmax = 95 << 16;        /* default to 95 degrees C */
 144
 145         /* We keep a global tmax for overtemp calculations */
 146         if (tmax < cpu_all_tmax)
 147                 cpu_all_tmax = tmax;
 148
 149         kfree(hdr);
 150
 151         /* Get PID params from the appropriate SAT */
 152         hdr = smu_sat_get_sdb_partition(chip, 0xC8 + core, NULL);
 153         if (hdr == NULL) {
 154                 printk(KERN_WARNING"windfarm: can't get CPU PID fan config\n");
 155                 return -EINVAL;
 156         }
 157         piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
 158
 159         /*
 160          * Darwin has a minimum fan speed of 1000 rpm for the 4-way and
 161          * 515 for the 2-way.  That appears to be overkill, so for now,
 162          * impose a minimum of 750 or 515.
 163          */
 164         fmin = (nr_cores > 2) ? 750 : 515;
 165
 166         /* Initialize PID loop */
 167         pid.interval = 1;       /* seconds */
 168         pid.history_len = piddata->history_len;
 169         pid.gd = piddata->gd;
 170         pid.gp = piddata->gp;
 171         pid.gr = piddata->gr / piddata->history_len;
 172         pid.pmaxadj = (piddata->max_power << 16) - (piddata->power_adj << 8);
 173         pid.ttarget = tmax - (piddata->target_temp_delta << 16);
 174         pid.tmax = tmax;
 175         pid.min = main_fan->ops->get_min(main_fan);
 176         pid.max = main_fan->ops->get_max(main_fan);
 177         if (pid.min < fmin)
 178                 pid.min = fmin;
 179
 180         wf_cpu_pid_init(&cpu_pid[cpu], &pid);
 181
 182         kfree(hdr);
 183
 184         return 0;
 185 }
 186
 187 static void cpu_max_all_fans(void)
 188 {
 189         int i;
 190
 191         /* We max all CPU fans in case of a sensor error. We also do the
 192          * cpufreq clamping now, even if it's supposedly done later by the
 193          * generic code anyway, we do it earlier here to react faster
 194          */
 195         if (cpufreq_clamp)
 196                 wf_control_set_max(cpufreq_clamp);
 197         for (i = 0; i < NR_CPU_FANS; ++i)
 198                 if (cpu_fans[i])
 199                         wf_control_set_max(cpu_fans[i]);
 200 }
 201
 202 static int cpu_check_overtemp(s32 temp)
 203 {
 204         int new_state = 0;
 205         s32 t_avg, t_old;
 206
 207         /* First check for immediate overtemps */
 208         if (temp >= (cpu_all_tmax + LOW_OVER_IMMEDIATE)) {
 209                 new_state |= FAILURE_LOW_OVERTEMP;
 210                 if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
 211                         printk(KERN_ERR "windfarm: Overtemp due to immediate CPU"
 212                                " temperature !\n");
 213         }
 214         if (temp >= (cpu_all_tmax + HIGH_OVER_IMMEDIATE)) {
 215                 new_state |= FAILURE_HIGH_OVERTEMP;
 216                 if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
 217                         printk(KERN_ERR "windfarm: Critical overtemp due to"
 218                                " immediate CPU temperature !\n");
 219         }
 220
 221         /* We calculate a history of max temperatures and use that for the
 222          * overtemp management
 223          */
 224         t_old = cpu_thist[cpu_thist_pt];
 225         cpu_thist[cpu_thist_pt] = temp;
 226         cpu_thist_pt = (cpu_thist_pt + 1) % CPU_TEMP_HIST_SIZE;
 227         cpu_thist_total -= t_old;
 228         cpu_thist_total += temp;
 229         t_avg = cpu_thist_total / CPU_TEMP_HIST_SIZE;
 230
 231         DBG_LOTS("t_avg = %d.%03d (out: %d.%03d, in: %d.%03d)\n",
 232                  FIX32TOPRINT(t_avg), FIX32TOPRINT(t_old), FIX32TOPRINT(temp));
 233
 234         /* Now check for average overtemps */
 235         if (t_avg >= (cpu_all_tmax + LOW_OVER_AVERAGE)) {
 236                 new_state |= FAILURE_LOW_OVERTEMP;
 237                 if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
 238                         printk(KERN_ERR "windfarm: Overtemp due to average CPU"
 239                                " temperature !\n");
 240         }
 241         if (t_avg >= (cpu_all_tmax + HIGH_OVER_AVERAGE)) {
 242                 new_state |= FAILURE_HIGH_OVERTEMP;
 243                 if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
 244                         printk(KERN_ERR "windfarm: Critical overtemp due to"
 245                                " average CPU temperature !\n");
 246         }
 247
 248         /* Now handle overtemp conditions. We don't currently use the windfarm
 249          * overtemp handling core as it's not fully suited to the needs of those
 250          * new machine. This will be fixed later.
 251          */
 252         if (new_state) {
 253                 /* High overtemp -> immediate shutdown */
 254                 if (new_state & FAILURE_HIGH_OVERTEMP)
 255                         machine_power_off();
 256                 if ((failure_state & new_state) != new_state)
 257                         cpu_max_all_fans();
 258                 failure_state |= new_state;
 259         } else if ((failure_state & FAILURE_LOW_OVERTEMP) &&
 260                    (temp < (cpu_all_tmax + LOW_OVER_CLEAR))) {
 261                 printk(KERN_ERR "windfarm: Overtemp condition cleared !\n");
 262                 failure_state &= ~FAILURE_LOW_OVERTEMP;
 263         }
 264
 265         return failure_state & (FAILURE_LOW_OVERTEMP | FAILURE_HIGH_OVERTEMP);
 266 }
 267
 268 static void cpu_fans_tick(void)
 269 {
 270         int err, cpu;
 271         s32 greatest_delta = 0;
 272         s32 temp, power, t_max = 0;
 273         int i, t, target = 0;
 274         struct wf_sensor *sr;
 275         struct wf_control *ct;
 276         struct wf_cpu_pid_state *sp;
 277
 278         DBG_LOTS(KERN_DEBUG);
 279         for (cpu = 0; cpu < nr_cores; ++cpu) {
 280                 /* Get CPU core temperature */
 281                 sr = sens_cpu_temp[cpu];
 282                 err = sr->ops->get_value(sr, &temp);
 283                 if (err) {
 284                         DBG("\n");
 285                         printk(KERN_WARNING "windfarm: CPU %d temperature "
 286                                "sensor error %d\n", cpu, err);
 287                         failure_state |= FAILURE_SENSOR;
 288                         cpu_max_all_fans();
 289                         return;
 290                 }
 291
 292                 /* Keep track of highest temp */
 293                 t_max = max(t_max, temp);
 294
 295                 /* Get CPU power */
 296                 sr = sens_cpu_power[cpu];
 297                 err = sr->ops->get_value(sr, &power);
 298                 if (err) {
 299                         DBG("\n");
 300                         printk(KERN_WARNING "windfarm: CPU %d power "
 301                                "sensor error %d\n", cpu, err);
 302                         failure_state |= FAILURE_SENSOR;
 303                         cpu_max_all_fans();
 304                         return;
 305                 }
 306
 307                 /* Run PID */
 308                 sp = &cpu_pid[cpu];
 309                 t = wf_cpu_pid_run(sp, power, temp);
 310
 311                 if (cpu == 0 || sp->last_delta > greatest_delta) {
 312                         greatest_delta = sp->last_delta;
 313                         target = t;
 314                 }
 315                 DBG_LOTS("[%d] P=%d.%.3d T=%d.%.3d ",
 316                     cpu, FIX32TOPRINT(power), FIX32TOPRINT(temp));
 317         }
 318         DBG_LOTS("fans = %d, t_max = %d.%03d\n", target, FIX32TOPRINT(t_max));
 319
 320         /* Darwin limits decrease to 20 per iteration */
 321         if (target < (cpu_last_target - 20))
 322                 target = cpu_last_target - 20;
 323         cpu_last_target = target;
 324         for (cpu = 0; cpu < nr_cores; ++cpu)
 325                 cpu_pid[cpu].target = target;
 326
 327         /* Handle possible overtemps */
 328         if (cpu_check_overtemp(t_max))
 329                 return;
 330
 331         /* Set fans */
 332         for (i = 0; i < NR_CPU_FANS; ++i) {
 333                 ct = cpu_fans[i];
 334                 if (ct == NULL)
 335                         continue;
 336                 err = ct->ops->set_value(ct, target * cpu_fan_scale[i] / 100);
 337                 if (err) {
 338                         printk(KERN_WARNING "windfarm: fan %s reports "
 339                                "error %d\n", ct->name, err);
 340                         failure_state |= FAILURE_FAN;
 341                         break;
 342                 }
 343         }
 344 }
 345
 346 /* Backside/U4 fan */
 347 static struct wf_pid_param backside_param = {
 348         .interval       = 5,
 349         .history_len    = 2,
 350         .gd             = 48 << 20,
 351         .gp             = 5 << 20,
 352         .gr             = 0,
 353         .itarget        = 64 << 16,
 354         .additive       = 1,
 355 };
 356
 357 static void backside_fan_tick(void)
 358 {
 359         s32 temp;
 360         int speed;
 361         int err;
 362
 363         if (!backside_fan || !u4_temp)
 364                 return;
 365         if (!backside_tick) {
 366                 /* first time; initialize things */
 367                 printk(KERN_INFO "windfarm: Backside control loop started.\n");
 368                 backside_param.min = backside_fan->ops->get_min(backside_fan);
 369                 backside_param.max = backside_fan->ops->get_max(backside_fan);
 370                 wf_pid_init(&backside_pid, &backside_param);
 371                 backside_tick = 1;
 372         }
 373         if (--backside_tick > 0)
 374                 return;
 375         backside_tick = backside_pid.param.interval;
 376
 377         err = u4_temp->ops->get_value(u4_temp, &temp);
 378         if (err) {
 379                 printk(KERN_WARNING "windfarm: U4 temp sensor error %d\n",
 380                        err);
 381                 failure_state |= FAILURE_SENSOR;
 382                 wf_control_set_max(backside_fan);
 383                 return;
 384         }
 385         speed = wf_pid_run(&backside_pid, temp);
 386         DBG_LOTS("backside PID temp=%d.%.3d speed=%d\n",
 387                  FIX32TOPRINT(temp), speed);
 388
 389         err = backside_fan->ops->set_value(backside_fan, speed);
 390         if (err) {
 391                 printk(KERN_WARNING "windfarm: backside fan error %d\n", err);
 392                 failure_state |= FAILURE_FAN;
 393         }
 394 }
 395
 396 /* Drive bay fan */
 397 static struct wf_pid_param drive_bay_prm = {
 398         .interval       = 5,
 399         .history_len    = 2,
 400         .gd             = 30 << 20,
 401         .gp             = 5 << 20,
 402         .gr             = 0,
 403         .itarget        = 40 << 16,
 404         .additive       = 1,
 405 };
 406
 407 static void drive_bay_fan_tick(void)
 408 {
 409         s32 temp;
 410         int speed;
 411         int err;
 412
 413         if (!drive_bay_fan || !hd_temp)
 414                 return;
 415         if (!drive_bay_tick) {
 416                 /* first time; initialize things */
 417                 printk(KERN_INFO "windfarm: Drive bay control loop started.\n");
 418                 drive_bay_prm.min = drive_bay_fan->ops->get_min(drive_bay_fan);
 419                 drive_bay_prm.max = drive_bay_fan->ops->get_max(drive_bay_fan);
 420                 wf_pid_init(&drive_bay_pid, &drive_bay_prm);
 421                 drive_bay_tick = 1;
 422         }
 423         if (--drive_bay_tick > 0)
 424                 return;
 425         drive_bay_tick = drive_bay_pid.param.interval;
 426
 427         err = hd_temp->ops->get_value(hd_temp, &temp);
 428         if (err) {
 429                 printk(KERN_WARNING "windfarm: drive bay temp sensor "
 430                        "error %d\n", err);
 431                 failure_state |= FAILURE_SENSOR;
 432                 wf_control_set_max(drive_bay_fan);
 433                 return;
 434         }
 435         speed = wf_pid_run(&drive_bay_pid, temp);
 436         DBG_LOTS("drive_bay PID temp=%d.%.3d speed=%d\n",
 437                  FIX32TOPRINT(temp), speed);
 438
 439         err = drive_bay_fan->ops->set_value(drive_bay_fan, speed);
 440         if (err) {
 441                 printk(KERN_WARNING "windfarm: drive bay fan error %d\n", err);
 442                 failure_state |= FAILURE_FAN;
 443         }
 444 }
 445
 446 /* PCI slots area fan */
 447 /* This makes the fan speed proportional to the power consumed */
 448 static struct wf_pid_param slots_param = {
 449         .interval       = 1,
 450         .history_len    = 2,
 451         .gd             = 0,
 452         .gp             = 0,
 453         .gr             = 0x1277952,
 454         .itarget        = 0,
 455         .min            = 1560,
 456         .max            = 3510,
 457 };
 458
 459 static void slots_fan_tick(void)
 460 {
 461         s32 power;
 462         int speed;
 463         int err;
 464
 465         if (!slots_fan || !slots_power)
 466                 return;
 467         if (!slots_started) {
 468                 /* first time; initialize things */
 469                 printk(KERN_INFO "windfarm: Slots control loop started.\n");
 470                 wf_pid_init(&slots_pid, &slots_param);
 471                 slots_started = 1;
 472         }
 473
 474         err = slots_power->ops->get_value(slots_power, &power);
 475         if (err) {
 476                 printk(KERN_WARNING "windfarm: slots power sensor error %d\n",
 477                        err);
 478                 failure_state |= FAILURE_SENSOR;
 479                 wf_control_set_max(slots_fan);
 480                 return;
 481         }
 482         speed = wf_pid_run(&slots_pid, power);
 483         DBG_LOTS("slots PID power=%d.%.3d speed=%d\n",
 484                  FIX32TOPRINT(power), speed);
 485
 486         err = slots_fan->ops->set_value(slots_fan, speed);
 487         if (err) {
 488                 printk(KERN_WARNING "windfarm: slots fan error %d\n", err);
 489                 failure_state |= FAILURE_FAN;
 490         }
 491 }
 492
 493 static void set_fail_state(void)
 494 {
 495         int i;
 496
 497         if (cpufreq_clamp)
 498                 wf_control_set_max(cpufreq_clamp);
 499         for (i = 0; i < NR_CPU_FANS; ++i)
 500                 if (cpu_fans[i])
 501                         wf_control_set_max(cpu_fans[i]);
 502         if (backside_fan)
 503                 wf_control_set_max(backside_fan);
 504         if (slots_fan)
 505                 wf_control_set_max(slots_fan);
 506         if (drive_bay_fan)
 507                 wf_control_set_max(drive_bay_fan);
 508 }
 509
 510 static void pm112_tick(void)
 511 {
 512         int i, last_failure;
 513
 514         if (!started) {
 515                 started = 1;
 516                 printk(KERN_INFO "windfarm: CPUs control loops started.\n");
 517                 for (i = 0; i < nr_cores; ++i) {
 518                         if (create_cpu_loop(i) < 0) {
 519                                 failure_state = FAILURE_PERM;
 520                                 set_fail_state();
 521                                 break;
 522                         }
 523                 }
 524                 DBG_LOTS("cpu_all_tmax=%d.%03d\n", FIX32TOPRINT(cpu_all_tmax));
 525
 526 #ifdef HACKED_OVERTEMP
 527                 cpu_all_tmax = 60 << 16;
 528 #endif
 529         }
 530
 531         /* Permanent failure, bail out */
 532         if (failure_state & FAILURE_PERM)
 533                 return;
 534         /* Clear all failure bits except low overtemp which will be eventually
 535          * cleared by the control loop itself
 536          */
 537         last_failure = failure_state;
 538         failure_state &= FAILURE_LOW_OVERTEMP;
 539         cpu_fans_tick();
 540         backside_fan_tick();
 541         slots_fan_tick();
 542         drive_bay_fan_tick();
 543
 544         DBG_LOTS("last_failure: 0x%x, failure_state: %x\n",
 545                  last_failure, failure_state);
 546
 547         /* Check for failures. Any failure causes cpufreq clamping */
 548         if (failure_state && last_failure == 0 && cpufreq_clamp)
 549                 wf_control_set_max(cpufreq_clamp);
 550         if (failure_state == 0 && last_failure && cpufreq_clamp)
 551                 wf_control_set_min(cpufreq_clamp);
 552
 553         /* That's it for now, we might want to deal with other failures
 554          * differently in the future though
 555          */
 556 }
 557
 558 static void pm112_new_control(struct wf_control *ct)
 559 {
 560         int i, max_exhaust;
 561
 562         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
 563                 if (wf_get_control(ct) == 0)
 564                         cpufreq_clamp = ct;
 565         }
 566
 567         for (i = 0; i < NR_CPU_FANS; ++i) {
 568                 if (!strcmp(ct->name, cpu_fan_names[i])) {
 569                         if (cpu_fans[i] == NULL && wf_get_control(ct) == 0)
 570                                 cpu_fans[i] = ct;
 571                         break;
 572                 }
 573         }
 574         if (i >= NR_CPU_FANS) {
 575                 /* not a CPU fan, try the others */
 576                 if (!strcmp(ct->name, "backside-fan")) {
 577                         if (backside_fan == NULL && wf_get_control(ct) == 0)
 578                                 backside_fan = ct;
 579                 } else if (!strcmp(ct->name, "slots-fan")) {
 580                         if (slots_fan == NULL && wf_get_control(ct) == 0)
 581                                 slots_fan = ct;
 582                 } else if (!strcmp(ct->name, "drive-bay-fan")) {
 583                         if (drive_bay_fan == NULL && wf_get_control(ct) == 0)
 584                                 drive_bay_fan = ct;
 585                 }
 586                 return;
 587         }
 588
 589         for (i = 0; i < CPU_FANS_REQD; ++i)
 590                 if (cpu_fans[i] == NULL)
 591                         return;
 592
 593         /* work out pump scaling factors */
 594         max_exhaust = cpu_fans[0]->ops->get_max(cpu_fans[0]);
 595         for (i = FIRST_PUMP; i <= LAST_PUMP; ++i)
 596                 if ((ct = cpu_fans[i]) != NULL)
 597                         cpu_fan_scale[i] =
 598                                 ct->ops->get_max(ct) * 100 / max_exhaust;
 599
 600         have_all_controls = 1;
 601 }
 602
 603 static void pm112_new_sensor(struct wf_sensor *sr)
 604 {
 605         unsigned int i;
 606
 607         if (!strncmp(sr->name, "cpu-temp-", 9)) {
 608                 i = sr->name[9] - '0';
 609                 if (sr->name[10] == 0 && i < NR_CORES &&
 610                     sens_cpu_temp[i] == NULL && wf_get_sensor(sr) == 0)
 611                         sens_cpu_temp[i] = sr;
 612
 613         } else if (!strncmp(sr->name, "cpu-power-", 10)) {
 614                 i = sr->name[10] - '0';
 615                 if (sr->name[11] == 0 && i < NR_CORES &&
 616                     sens_cpu_power[i] == NULL && wf_get_sensor(sr) == 0)
 617                         sens_cpu_power[i] = sr;
 618         } else if (!strcmp(sr->name, "hd-temp")) {
 619                 if (hd_temp == NULL && wf_get_sensor(sr) == 0)
 620                         hd_temp = sr;
 621         } else if (!strcmp(sr->name, "slots-power")) {
 622                 if (slots_power == NULL && wf_get_sensor(sr) == 0)
 623                         slots_power = sr;
 624         } else if (!strcmp(sr->name, "backside-temp")) {
 625                 if (u4_temp == NULL && wf_get_sensor(sr) == 0)
 626                         u4_temp = sr;
 627         } else
 628                 return;
 629
 630         /* check if we have all the sensors we need */
 631         for (i = 0; i < nr_cores; ++i)
 632                 if (sens_cpu_temp[i] == NULL || sens_cpu_power[i] == NULL)
 633                         return;
 634
 635         have_all_sensors = 1;
 636 }
 637
 638 static int pm112_wf_notify(struct notifier_block *self,
 639                            unsigned long event, void *data)
 640 {
 641         switch (event) {
 642         case WF_EVENT_NEW_SENSOR:
 643                 pm112_new_sensor(data);
 644                 break;
 645         case WF_EVENT_NEW_CONTROL:
 646                 pm112_new_control(data);
 647                 break;
 648         case WF_EVENT_TICK:
 649                 if (have_all_controls && have_all_sensors)
 650                         pm112_tick();
 651         }
 652         return 0;
 653 }
 654
 655 static struct notifier_block pm112_events = {
 656         .notifier_call = pm112_wf_notify,
 657 };
 658
 659 static int wf_pm112_probe(struct platform_device *dev)
 660 {
 661         wf_register_client(&pm112_events);
 662         return 0;
 663 }
 664
 665 static int wf_pm112_remove(struct platform_device *dev)
 666 {
 667         wf_unregister_client(&pm112_events);
 668         /* should release all sensors and controls */
 669         return 0;
 670 }
 671
 672 static struct platform_driver wf_pm112_driver = {
 673         .probe = wf_pm112_probe,
 674         .remove = wf_pm112_remove,
 675         .driver = {
 676                 .name = "windfarm",
 677                 .owner  = THIS_MODULE,
 678         },
 679 };
 680
 681 static int __init wf_pm112_init(void)
 682 {
 683         struct device_node *cpu;
 684
 685         if (!of_machine_is_compatible("PowerMac11,2"))
 686                 return -ENODEV;
 687
 688         /* Count the number of CPU cores */
 689         nr_cores = 0;
 690         for_each_node_by_type(cpu, "cpu")
 691                 ++nr_cores;
 692
 693         printk(KERN_INFO "windfarm: initializing for dual-core desktop G5\n");
 694
 695 #ifdef MODULE
 696         request_module("windfarm_smu_controls");
 697         request_module("windfarm_smu_sensors");
 698         request_module("windfarm_smu_sat");
 699         request_module("windfarm_lm75_sensor");
 700         request_module("windfarm_max6690_sensor");
 701         request_module("windfarm_cpufreq_clamp");
 702
 703 #endif /* MODULE */
 704
 705         platform_driver_register(&wf_pm112_driver);
 706         return 0;
 707 }
 708
 709 static void __exit wf_pm112_exit(void)
 710 {
 711         platform_driver_unregister(&wf_pm112_driver);
 712 }
 713
 714 module_init(wf_pm112_init);
 715 module_exit(wf_pm112_exit);
 716
 717 MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
 718 MODULE_DESCRIPTION("Thermal control for PowerMac11,2");
 719 MODULE_LICENSE("GPL");
 720 MODULE_ALIAS("platform:windfarm");