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
 226 static int pm121_mach_model;    /* machine model id */
 227
 228 /* Controls & sensors */
 229 static struct wf_sensor *sensor_cpu_power;
 230 static struct wf_sensor *sensor_cpu_temp;
 231 static struct wf_sensor *sensor_cpu_voltage;
 232 static struct wf_sensor *sensor_cpu_current;
 233 static struct wf_sensor *sensor_gpu_temp;
 234 static struct wf_sensor *sensor_north_bridge_temp;
 235 static struct wf_sensor *sensor_hard_drive_temp;
 236 static struct wf_sensor *sensor_optical_drive_temp;
 237 static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */
 238
 239 enum {
 240         FAN_CPU,
 241         FAN_HD,
 242         FAN_OD,
 243         CPUFREQ,
 244         N_CONTROLS
 245 };
 246 static struct wf_control *controls[N_CONTROLS] = {};
 247
 248 /* Set to kick the control loop into life */
 249 static int pm121_all_controls_ok, pm121_all_sensors_ok, pm121_started;
 250
 251 enum {
 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. */
 259 enum {
 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
 268 static const char *loop_names[N_LOOPS] = {
 269         "GPU",
 270         "HD",
 271         "KODIAK",
 272         "OD",
 273 };
 274
 275 #define PM121_NUM_CONFIGS       2
 276
 277 static unsigned int pm121_failure_state;
 278 static int pm121_readjust, pm121_skipping;
 279 static s32 average_power;
 280
 281 struct pm121_correction {
 282         int     offset;
 283         int     slope;
 284 };
 285
 286 static 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
 323 struct pm121_connection {
 324         unsigned int    control_id;
 325         unsigned int    ref_id;
 326         struct pm121_correction correction;
 327 };
 328
 329 static 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 */
 347 static 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  */
 359 struct 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
 367 static struct pm121_sys_param
 368 pm121_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  */
 439 struct pm121_sys_state {
 440         int                     ticks;
 441         s32                     setpoint;
 442         struct wf_pid_state     pid;
 443 };
 444
 445 struct 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  */
 456 struct pm121_cpu_state {
 457         int                     ticks;
 458         s32                     setpoint;
 459         struct wf_cpu_pid_state pid;
 460 };
 461
 462 static 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 */
 472 static 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
 487 static 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 */
 516 static 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
 579 static 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 */
 639 static 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
 717 static 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
 785 static 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
 863 static 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
 874 static 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
 893 static 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
 904 static 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
 936 static 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
 959 static struct notifier_block pm121_events = {
 960         .notifier_call  = pm121_notify,
 961 };
 962
 963 static 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
 983 static int pm121_probe(struct platform_device *ddev)
 984 {
 985         wf_register_client(&pm121_events);
 986
 987         return 0;
 988 }
 989
 990 static int __devexit pm121_remove(struct platform_device *ddev)
 991 {
 992         wf_unregister_client(&pm121_events);
 993         return 0;
 994 }
 995
 996 static 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
1006 static 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
1026 static void __exit pm121_exit(void)
1027 {
1028
1029         platform_driver_unregister(&pm121_driver);
1030 }
1031
1032
1033 module_init(pm121_init);
1034 module_exit(pm121_exit);
1035
1036 MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>");
1037 MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");
1038 MODULE_LICENSE("GPL");
1039