drivers/macintosh/windfarm_pm81.c

   1 /*
   2  * Windfarm PowerMac thermal control. iMac G5
   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  * The algorithm used is the PID control algorithm, used the same
  10  * way the published Darwin code does, using the same values that
  11  * are present in the Darwin 8.2 snapshot property lists (note however
  12  * that none of the code has been re-used, it's a complete re-implementation
  13  *
  14  * The various control loops found in Darwin config file are:
  15  *
  16  * PowerMac8,1 and PowerMac8,2
  17  * ===========================
  18  *
  19  * System Fans control loop. Different based on models. In addition to the
  20  * usual PID algorithm, the control loop gets 2 additional pairs of linear
  21  * scaling factors (scale/offsets) expressed as 4.12 fixed point values
  22  * signed offset, unsigned scale)
  23  *
  24  * The targets are modified such as:
  25  *  - the linked control (second control) gets the target value as-is
  26  *    (typically the drive fan)
  27  *  - the main control (first control) gets the target value scaled with
  28  *    the first pair of factors, and is then modified as below
  29  *  - the value of the target of the CPU Fan control loop is retrieved,
  30  *    scaled with the second pair of factors, and the max of that and
  31  *    the scaled target is applied to the main control.
  32  *
  33  * # model_id: 2
  34  *   controls       : system-fan, drive-bay-fan
  35  *   sensors        : hd-temp
  36  *   PID params     : G_d = 0x15400000
  37  *                    G_p = 0x00200000
  38  *                    G_r = 0x000002fd
  39  *                    History = 2 entries
  40  *                    Input target = 0x3a0000
  41  *                    Interval = 5s
  42  *   linear-factors : offset = 0xff38 scale  = 0x0ccd
  43  *                    offset = 0x0208 scale  = 0x07ae
  44  *
  45  * # model_id: 3
  46  *   controls       : system-fan, drive-bay-fan
  47  *   sensors        : hd-temp
  48  *   PID params     : G_d = 0x08e00000
  49  *                    G_p = 0x00566666
  50  *                    G_r = 0x0000072b
  51  *                    History = 2 entries
  52  *                    Input target = 0x350000
  53  *                    Interval = 5s
  54  *   linear-factors : offset = 0xff38 scale  = 0x0ccd
  55  *                    offset = 0x0000 scale  = 0x0000
  56  *
  57  * # model_id: 5
  58  *   controls       : system-fan
  59  *   sensors        : hd-temp
  60  *   PID params     : G_d = 0x15400000
  61  *                    G_p = 0x00233333
  62  *                    G_r = 0x000002fd
  63  *                    History = 2 entries
  64  *                    Input target = 0x3a0000
  65  *                    Interval = 5s
  66  *   linear-factors : offset = 0x0000 scale  = 0x1000
  67  *                    offset = 0x0091 scale  = 0x0bae
  68  *
  69  * CPU Fan control loop. The loop is identical for all models. it
  70  * has an additional pair of scaling factor. This is used to scale the
  71  * systems fan control loop target result (the one before it gets scaled
  72  * by the System Fans control loop itself). Then, the max value of the
  73  * calculated target value and system fan value is sent to the fans
  74  *
  75  *   controls       : cpu-fan
  76  *   sensors        : cpu-temp cpu-power
  77  *   PID params     : From SMU sdb partition
  78  *   linear-factors : offset = 0xfb50 scale  = 0x1000
  79  *
  80  * CPU Slew control loop. Not implemented. The cpufreq driver in linux is
  81  * completely separate for now, though we could find a way to link it, either
  82  * as a client reacting to overtemp notifications, or directling monitoring
  83  * the CPU temperature
  84  *
  85  * WARNING ! The CPU control loop requires the CPU tmax for the current
  86  * operating point. However, we currently are completely separated from
  87  * the cpufreq driver and thus do not know what the current operating
  88  * point is. Fortunately, we also do not have any hardware supporting anything
  89  * but operating point 0 at the moment, thus we just peek that value directly
  90  * from the SDB partition. If we ever end up with actually slewing the system
  91  * clock and thus changing operating points, we'll have to find a way to
  92  * communicate with the CPU freq driver;
  93  *
  94  */
  95
  96 #include <linux/types.h>
  97 #include <linux/errno.h>
  98 #include <linux/kernel.h>
  99 #include <linux/delay.h>
 100 #include <linux/slab.h>
 101 #include <linux/init.h>
 102 #include <linux/spinlock.h>
 103 #include <linux/wait.h>
 104 #include <linux/kmod.h>
 105 #include <linux/device.h>
 106 #include <linux/platform_device.h>
 107 #include <asm/prom.h>
 108 #include <asm/machdep.h>
 109 #include <asm/io.h>
 110 #include <asm/sections.h>
 111 #include <asm/smu.h>
 112
 113 #include "windfarm.h"
 114 #include "windfarm_pid.h"
 115
 116 #define VERSION "0.4"
 117
 118 #undef DEBUG
 119
 120 #ifdef DEBUG
 121 #define DBG(args...)    printk(args)
 122 #else
 123 #define DBG(args...)    do { } while(0)
 124 #endif
 125
 126 /* define this to force CPU overtemp to 74 degree, useful for testing
 127  * the overtemp code
 128  */
 129 #undef HACKED_OVERTEMP
 130
 131 static int wf_smu_mach_model;   /* machine model id */
 132
 133 /* Controls & sensors */
 134 static struct wf_sensor *sensor_cpu_power;
 135 static struct wf_sensor *sensor_cpu_temp;
 136 static struct wf_sensor *sensor_hd_temp;
 137 static struct wf_control *fan_cpu_main;
 138 static struct wf_control *fan_hd;
 139 static struct wf_control *fan_system;
 140 static struct wf_control *cpufreq_clamp;
 141
 142 /* Set to kick the control loop into life */
 143 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok;
 144 static bool wf_smu_started;
 145
 146 /* Failure handling.. could be nicer */
 147 #define FAILURE_FAN             0x01
 148 #define FAILURE_SENSOR          0x02
 149 #define FAILURE_OVERTEMP        0x04
 150
 151 static unsigned int wf_smu_failure_state;
 152 static int wf_smu_readjust, wf_smu_skipping;
 153 static bool wf_smu_overtemp;
 154
 155 /*
 156  * ****** System Fans Control Loop ******
 157  *
 158  */
 159
 160 /* Parameters for the System Fans control loop. Parameters
 161  * not in this table such as interval, history size, ...
 162  * are common to all versions and thus hard coded for now.
 163  */
 164 struct wf_smu_sys_fans_param {
 165         int     model_id;
 166         s32     itarget;
 167         s32     gd, gp, gr;
 168
 169         s16     offset0;
 170         u16     scale0;
 171         s16     offset1;
 172         u16     scale1;
 173 };
 174
 175 #define WF_SMU_SYS_FANS_INTERVAL        5
 176 #define WF_SMU_SYS_FANS_HISTORY_SIZE    2
 177
 178 /* State data used by the system fans control loop
 179  */
 180 struct wf_smu_sys_fans_state {
 181         int                     ticks;
 182         s32                     sys_setpoint;
 183         s32                     hd_setpoint;
 184         s16                     offset0;
 185         u16                     scale0;
 186         s16                     offset1;
 187         u16                     scale1;
 188         struct wf_pid_state     pid;
 189 };
 190
 191 /*
 192  * Configs for SMU System Fan control loop
 193  */
 194 static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = {
 195         /* Model ID 2 */
 196         {
 197                 .model_id       = 2,
 198                 .itarget        = 0x3a0000,
 199                 .gd             = 0x15400000,
 200                 .gp             = 0x00200000,
 201                 .gr             = 0x000002fd,
 202                 .offset0        = 0xff38,
 203                 .scale0         = 0x0ccd,
 204                 .offset1        = 0x0208,
 205                 .scale1         = 0x07ae,
 206         },
 207         /* Model ID 3 */
 208         {
 209                 .model_id       = 3,
 210                 .itarget        = 0x350000,
 211                 .gd             = 0x08e00000,
 212                 .gp             = 0x00566666,
 213                 .gr             = 0x0000072b,
 214                 .offset0        = 0xff38,
 215                 .scale0         = 0x0ccd,
 216                 .offset1        = 0x0000,
 217                 .scale1         = 0x0000,
 218         },
 219         /* Model ID 5 */
 220         {
 221                 .model_id       = 5,
 222                 .itarget        = 0x3a0000,
 223                 .gd             = 0x15400000,
 224                 .gp             = 0x00233333,
 225                 .gr             = 0x000002fd,
 226                 .offset0        = 0x0000,
 227                 .scale0         = 0x1000,
 228                 .offset1        = 0x0091,
 229                 .scale1         = 0x0bae,
 230         },
 231 };
 232 #define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params)
 233
 234 static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
 235
 236 /*
 237  * ****** CPU Fans Control Loop ******
 238  *
 239  */
 240
 241
 242 #define WF_SMU_CPU_FANS_INTERVAL        1
 243 #define WF_SMU_CPU_FANS_MAX_HISTORY     16
 244 #define WF_SMU_CPU_FANS_SIBLING_SCALE   0x00001000
 245 #define WF_SMU_CPU_FANS_SIBLING_OFFSET  0xfffffb50
 246
 247 /* State data used by the cpu fans control loop
 248  */
 249 struct wf_smu_cpu_fans_state {
 250         int                     ticks;
 251         s32                     cpu_setpoint;
 252         s32                     scale;
 253         s32                     offset;
 254         struct wf_cpu_pid_state pid;
 255 };
 256
 257 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
 258
 259
 260
 261 /*
 262  * ***** Implementation *****
 263  *
 264  */
 265
 266 static void wf_smu_create_sys_fans(void)
 267 {
 268         struct wf_smu_sys_fans_param *param = NULL;
 269         struct wf_pid_param pid_param;
 270         int i;
 271
 272         /* First, locate the params for this model */
 273         for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++)
 274                 if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) {
 275                         param = &wf_smu_sys_all_params[i];
 276                         break;
 277                 }
 278
 279         /* No params found, put fans to max */
 280         if (param == NULL) {
 281                 printk(KERN_WARNING "windfarm: System fan config not found "
 282                        "for this machine model, max fan speed\n");
 283                 goto fail;
 284         }
 285
 286         /* Alloc & initialize state */
 287         wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state),
 288                                   GFP_KERNEL);
 289         if (wf_smu_sys_fans == NULL) {
 290                 printk(KERN_WARNING "windfarm: Memory allocation error"
 291                        " max fan speed\n");
 292                 goto fail;
 293         }
 294         wf_smu_sys_fans->ticks = 1;
 295         wf_smu_sys_fans->scale0 = param->scale0;
 296         wf_smu_sys_fans->offset0 = param->offset0;
 297         wf_smu_sys_fans->scale1 = param->scale1;
 298         wf_smu_sys_fans->offset1 = param->offset1;
 299
 300         /* Fill PID params */
 301         pid_param.gd = param->gd;
 302         pid_param.gp = param->gp;
 303         pid_param.gr = param->gr;
 304         pid_param.interval = WF_SMU_SYS_FANS_INTERVAL;
 305         pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE;
 306         pid_param.itarget = param->itarget;
 307         pid_param.min = wf_control_get_min(fan_system);
 308         pid_param.max = wf_control_get_max(fan_system);
 309         if (fan_hd) {
 310                 pid_param.min =
 311                         max(pid_param.min, wf_control_get_min(fan_hd));
 312                 pid_param.max =
 313                         min(pid_param.max, wf_control_get_max(fan_hd));
 314         }
 315         wf_pid_init(&wf_smu_sys_fans->pid, &pid_param);
 316
 317         DBG("wf: System Fan control initialized.\n");
 318         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 319             FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max);
 320         return;
 321
 322  fail:
 323
 324         if (fan_system)
 325                 wf_control_set_max(fan_system);
 326         if (fan_hd)
 327                 wf_control_set_max(fan_hd);
 328 }
 329
 330 static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
 331 {
 332         s32 new_setpoint, temp, scaled, cputarget;
 333         int rc;
 334
 335         if (--st->ticks != 0) {
 336                 if (wf_smu_readjust)
 337                         goto readjust;
 338                 return;
 339         }
 340         st->ticks = WF_SMU_SYS_FANS_INTERVAL;
 341
 342         rc = wf_sensor_get(sensor_hd_temp, &temp);
 343         if (rc) {
 344                 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
 345                        rc);
 346                 wf_smu_failure_state |= FAILURE_SENSOR;
 347                 return;
 348         }
 349
 350         DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
 351             FIX32TOPRINT(temp));
 352
 353         if (temp > (st->pid.param.itarget + 0x50000))
 354                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 355
 356         new_setpoint = wf_pid_run(&st->pid, temp);
 357
 358         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
 359
 360         scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
 361
 362         DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
 363
 364         cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
 365         cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
 366         scaled = max(scaled, cputarget);
 367         scaled = max(scaled, st->pid.param.min);
 368         scaled = min(scaled, st->pid.param.max);
 369
 370         DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);
 371
 372         if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
 373                 return;
 374         st->sys_setpoint = scaled;
 375         st->hd_setpoint = new_setpoint;
 376  readjust:
 377         if (fan_system && wf_smu_failure_state == 0) {
 378                 rc = wf_control_set(fan_system, st->sys_setpoint);
 379                 if (rc) {
 380                         printk(KERN_WARNING "windfarm: Sys fan error %d\n",
 381                                rc);
 382                         wf_smu_failure_state |= FAILURE_FAN;
 383                 }
 384         }
 385         if (fan_hd && wf_smu_failure_state == 0) {
 386                 rc = wf_control_set(fan_hd, st->hd_setpoint);
 387                 if (rc) {
 388                         printk(KERN_WARNING "windfarm: HD fan error %d\n",
 389                                rc);
 390                         wf_smu_failure_state |= FAILURE_FAN;
 391                 }
 392         }
 393 }
 394
 395 static void wf_smu_create_cpu_fans(void)
 396 {
 397         struct wf_cpu_pid_param pid_param;
 398         const struct smu_sdbp_header *hdr;
 399         struct smu_sdbp_cpupiddata *piddata;
 400         struct smu_sdbp_fvt *fvt;
 401         s32 tmax, tdelta, maxpow, powadj;
 402
 403         /* First, locate the PID params in SMU SBD */
 404         hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
 405         if (hdr == 0) {
 406                 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
 407                        "max fan speed\n");
 408                 goto fail;
 409         }
 410         piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
 411
 412         /* Get the FVT params for operating point 0 (the only supported one
 413          * for now) in order to get tmax
 414          */
 415         hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
 416         if (hdr) {
 417                 fvt = (struct smu_sdbp_fvt *)&hdr[1];
 418                 tmax = ((s32)fvt->maxtemp) << 16;
 419         } else
 420                 tmax = 0x5e0000; /* 94 degree default */
 421
 422         /* Alloc & initialize state */
 423         wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
 424                                   GFP_KERNEL);
 425         if (wf_smu_cpu_fans == NULL)
 426                 goto fail;
 427         wf_smu_cpu_fans->ticks = 1;
 428
 429         wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
 430         wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
 431
 432         /* Fill PID params */
 433         pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
 434         pid_param.history_len = piddata->history_len;
 435         if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
 436                 printk(KERN_WARNING "windfarm: History size overflow on "
 437                        "CPU control loop (%d)\n", piddata->history_len);
 438                 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
 439         }
 440         pid_param.gd = piddata->gd;
 441         pid_param.gp = piddata->gp;
 442         pid_param.gr = piddata->gr / pid_param.history_len;
 443
 444         tdelta = ((s32)piddata->target_temp_delta) << 16;
 445         maxpow = ((s32)piddata->max_power) << 16;
 446         powadj = ((s32)piddata->power_adj) << 16;
 447
 448         pid_param.tmax = tmax;
 449         pid_param.ttarget = tmax - tdelta;
 450         pid_param.pmaxadj = maxpow - powadj;
 451
 452         pid_param.min = wf_control_get_min(fan_cpu_main);
 453         pid_param.max = wf_control_get_max(fan_cpu_main);
 454
 455         wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
 456
 457         DBG("wf: CPU Fan control initialized.\n");
 458         DBG("    ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
 459             FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
 460             pid_param.min, pid_param.max);
 461
 462         return;
 463
 464  fail:
 465         printk(KERN_WARNING "windfarm: CPU fan config not found\n"
 466                "for this machine model, max fan speed\n");
 467
 468         if (cpufreq_clamp)
 469                 wf_control_set_max(cpufreq_clamp);
 470         if (fan_cpu_main)
 471                 wf_control_set_max(fan_cpu_main);
 472 }
 473
 474 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
 475 {
 476         s32 new_setpoint, temp, power, systarget;
 477         int rc;
 478
 479         if (--st->ticks != 0) {
 480                 if (wf_smu_readjust)
 481                         goto readjust;
 482                 return;
 483         }
 484         st->ticks = WF_SMU_CPU_FANS_INTERVAL;
 485
 486         rc = wf_sensor_get(sensor_cpu_temp, &temp);
 487         if (rc) {
 488                 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
 489                        rc);
 490                 wf_smu_failure_state |= FAILURE_SENSOR;
 491                 return;
 492         }
 493
 494         rc = wf_sensor_get(sensor_cpu_power, &power);
 495         if (rc) {
 496                 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
 497                        rc);
 498                 wf_smu_failure_state |= FAILURE_SENSOR;
 499                 return;
 500         }
 501
 502         DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
 503             FIX32TOPRINT(temp), FIX32TOPRINT(power));
 504
 505 #ifdef HACKED_OVERTEMP
 506         if (temp > 0x4a0000)
 507                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 508 #else
 509         if (temp > st->pid.param.tmax)
 510                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 511 #endif
 512         new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
 513
 514         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
 515
 516         systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
 517         systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
 518                 + st->offset;
 519         new_setpoint = max(new_setpoint, systarget);
 520         new_setpoint = max(new_setpoint, st->pid.param.min);
 521         new_setpoint = min(new_setpoint, st->pid.param.max);
 522
 523         DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint);
 524
 525         if (st->cpu_setpoint == new_setpoint)
 526                 return;
 527         st->cpu_setpoint = new_setpoint;
 528  readjust:
 529         if (fan_cpu_main && wf_smu_failure_state == 0) {
 530                 rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
 531                 if (rc) {
 532                         printk(KERN_WARNING "windfarm: CPU main fan"
 533                                " error %d\n", rc);
 534                         wf_smu_failure_state |= FAILURE_FAN;
 535                 }
 536         }
 537 }
 538
 539 /*
 540  * ****** Setup / Init / Misc ... ******
 541  *
 542  */
 543
 544 static void wf_smu_tick(void)
 545 {
 546         unsigned int last_failure = wf_smu_failure_state;
 547         unsigned int new_failure;
 548
 549         if (!wf_smu_started) {
 550                 DBG("wf: creating control loops !\n");
 551                 wf_smu_create_sys_fans();
 552                 wf_smu_create_cpu_fans();
 553                 wf_smu_started = true;
 554         }
 555
 556         /* Skipping ticks */
 557         if (wf_smu_skipping && --wf_smu_skipping)
 558                 return;
 559
 560         wf_smu_failure_state = 0;
 561         if (wf_smu_sys_fans)
 562                 wf_smu_sys_fans_tick(wf_smu_sys_fans);
 563         if (wf_smu_cpu_fans)
 564                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
 565
 566         wf_smu_readjust = 0;
 567         new_failure = wf_smu_failure_state & ~last_failure;
 568
 569         /* If entering failure mode, clamp cpufreq and ramp all
 570          * fans to full speed.
 571          */
 572         if (wf_smu_failure_state && !last_failure) {
 573                 if (cpufreq_clamp)
 574                         wf_control_set_max(cpufreq_clamp);
 575                 if (fan_system)
 576                         wf_control_set_max(fan_system);
 577                 if (fan_cpu_main)
 578                         wf_control_set_max(fan_cpu_main);
 579                 if (fan_hd)
 580                         wf_control_set_max(fan_hd);
 581         }
 582
 583         /* If leaving failure mode, unclamp cpufreq and readjust
 584          * all fans on next iteration
 585          */
 586         if (!wf_smu_failure_state && last_failure) {
 587                 if (cpufreq_clamp)
 588                         wf_control_set_min(cpufreq_clamp);
 589                 wf_smu_readjust = 1;
 590         }
 591
 592         /* Overtemp condition detected, notify and start skipping a couple
 593          * ticks to let the temperature go down
 594          */
 595         if (new_failure & FAILURE_OVERTEMP) {
 596                 wf_set_overtemp();
 597                 wf_smu_skipping = 2;
 598                 wf_smu_overtemp = true;
 599         }
 600
 601         /* We only clear the overtemp condition if overtemp is cleared
 602          * _and_ no other failure is present. Since a sensor error will
 603          * clear the overtemp condition (can't measure temperature) at
 604          * the control loop levels, but we don't want to keep it clear
 605          * here in this case
 606          */
 607         if (!wf_smu_failure_state && wf_smu_overtemp) {
 608                 wf_clear_overtemp();
 609                 wf_smu_overtemp = false;
 610         }
 611 }
 612
 613 static void wf_smu_new_control(struct wf_control *ct)
 614 {
 615         if (wf_smu_all_controls_ok)
 616                 return;
 617
 618         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
 619                 if (wf_get_control(ct) == 0)
 620                         fan_cpu_main = ct;
 621         }
 622
 623         if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
 624                 if (wf_get_control(ct) == 0)
 625                         fan_system = ct;
 626         }
 627
 628         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
 629                 if (wf_get_control(ct) == 0)
 630                         cpufreq_clamp = ct;
 631         }
 632
 633         /* Darwin property list says the HD fan is only for model ID
 634          * 0, 1, 2 and 3
 635          */
 636
 637         if (wf_smu_mach_model > 3) {
 638                 if (fan_system && fan_cpu_main && cpufreq_clamp)
 639                         wf_smu_all_controls_ok = 1;
 640                 return;
 641         }
 642
 643         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
 644                 if (wf_get_control(ct) == 0)
 645                         fan_hd = ct;
 646         }
 647
 648         if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
 649                 wf_smu_all_controls_ok = 1;
 650 }
 651
 652 static void wf_smu_new_sensor(struct wf_sensor *sr)
 653 {
 654         if (wf_smu_all_sensors_ok)
 655                 return;
 656
 657         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
 658                 if (wf_get_sensor(sr) == 0)
 659                         sensor_cpu_power = sr;
 660         }
 661
 662         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
 663                 if (wf_get_sensor(sr) == 0)
 664                         sensor_cpu_temp = sr;
 665         }
 666
 667         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
 668                 if (wf_get_sensor(sr) == 0)
 669                         sensor_hd_temp = sr;
 670         }
 671
 672         if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
 673                 wf_smu_all_sensors_ok = 1;
 674 }
 675
 676
 677 static int wf_smu_notify(struct notifier_block *self,
 678                                unsigned long event, void *data)
 679 {
 680         switch(event) {
 681         case WF_EVENT_NEW_CONTROL:
 682                 DBG("wf: new control %s detected\n",
 683                     ((struct wf_control *)data)->name);
 684                 wf_smu_new_control(data);
 685                 wf_smu_readjust = 1;
 686                 break;
 687         case WF_EVENT_NEW_SENSOR:
 688                 DBG("wf: new sensor %s detected\n",
 689                     ((struct wf_sensor *)data)->name);
 690                 wf_smu_new_sensor(data);
 691                 break;
 692         case WF_EVENT_TICK:
 693                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
 694                         wf_smu_tick();
 695         }
 696
 697         return 0;
 698 }
 699
 700 static struct notifier_block wf_smu_events = {
 701         .notifier_call  = wf_smu_notify,
 702 };
 703
 704 static int wf_init_pm(void)
 705 {
 706         const struct smu_sdbp_header *hdr;
 707
 708         hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
 709         if (hdr != 0) {
 710                 struct smu_sdbp_sensortree *st =
 711                         (struct smu_sdbp_sensortree *)&hdr[1];
 712                 wf_smu_mach_model = st->model_id;
 713         }
 714
 715         printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
 716                wf_smu_mach_model);
 717
 718         return 0;
 719 }
 720
 721 static int wf_smu_probe(struct platform_device *ddev)
 722 {
 723         wf_register_client(&wf_smu_events);
 724
 725         return 0;
 726 }
 727
 728 static int wf_smu_remove(struct platform_device *ddev)
 729 {
 730         wf_unregister_client(&wf_smu_events);
 731
 732         /* XXX We don't have yet a guarantee that our callback isn't
 733          * in progress when returning from wf_unregister_client, so
 734          * we add an arbitrary delay. I'll have to fix that in the core
 735          */
 736         msleep(1000);
 737
 738         /* Release all sensors */
 739         /* One more crappy race: I don't think we have any guarantee here
 740          * that the attribute callback won't race with the sensor beeing
 741          * disposed of, and I'm not 100% certain what best way to deal
 742          * with that except by adding locks all over... I'll do that
 743          * eventually but heh, who ever rmmod this module anyway ?
 744          */
 745         if (sensor_cpu_power)
 746                 wf_put_sensor(sensor_cpu_power);
 747         if (sensor_cpu_temp)
 748                 wf_put_sensor(sensor_cpu_temp);
 749         if (sensor_hd_temp)
 750                 wf_put_sensor(sensor_hd_temp);
 751
 752         /* Release all controls */
 753         if (fan_cpu_main)
 754                 wf_put_control(fan_cpu_main);
 755         if (fan_hd)
 756                 wf_put_control(fan_hd);
 757         if (fan_system)
 758                 wf_put_control(fan_system);
 759         if (cpufreq_clamp)
 760                 wf_put_control(cpufreq_clamp);
 761
 762         /* Destroy control loops state structures */
 763         kfree(wf_smu_sys_fans);
 764         kfree(wf_smu_cpu_fans);
 765
 766         return 0;
 767 }
 768
 769 static struct platform_driver wf_smu_driver = {
 770         .probe = wf_smu_probe,
 771         .remove = wf_smu_remove,
 772         .driver = {
 773                 .name = "windfarm",
 774         },
 775 };
 776
 777
 778 static int __init wf_smu_init(void)
 779 {
 780         int rc = -ENODEV;
 781
 782         if (of_machine_is_compatible("PowerMac8,1") ||
 783             of_machine_is_compatible("PowerMac8,2"))
 784                 rc = wf_init_pm();
 785
 786         if (rc == 0) {
 787 #ifdef MODULE
 788                 request_module("windfarm_smu_controls");
 789                 request_module("windfarm_smu_sensors");
 790                 request_module("windfarm_lm75_sensor");
 791                 request_module("windfarm_cpufreq_clamp");
 792
 793 #endif /* MODULE */
 794                 platform_driver_register(&wf_smu_driver);
 795         }
 796
 797         return rc;
 798 }
 799
 800 static void __exit wf_smu_exit(void)
 801 {
 802
 803         platform_driver_unregister(&wf_smu_driver);
 804 }
 805
 806
 807 module_init(wf_smu_init);
 808 module_exit(wf_smu_exit);
 809
 810 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 811 MODULE_DESCRIPTION("Thermal control logic for iMac G5");
 812 MODULE_LICENSE("GPL");
 813 MODULE_ALIAS("platform:windfarm");