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;
 250 static bool pm121_started;
 251
 252 enum {
 253         FAILURE_FAN             = 1 << 0,
 254         FAILURE_SENSOR          = 1 << 1,
 255         FAILURE_OVERTEMP        = 1 << 2
 256 };
 257
 258 /* All sys loops. Note the HD before the OD loop in order to have it
 259    run before. */
 260 enum {
 261         LOOP_GPU,               /* control = hd or cpu, but luckily,
 262                                    it doesn't matter */
 263         LOOP_HD,                /* control = hd */
 264         LOOP_KODIAK,            /* control = hd or od */
 265         LOOP_OD,                /* control = od */
 266         N_LOOPS
 267 };
 268
 269 static const char *loop_names[N_LOOPS] = {
 270         "GPU",
 271         "HD",
 272         "KODIAK",
 273         "OD",
 274 };
 275
 276 #define PM121_NUM_CONFIGS       2
 277
 278 static unsigned int pm121_failure_state;
 279 static int pm121_readjust, pm121_skipping;
 280 static bool pm121_overtemp;
 281 static s32 average_power;
 282
 283 struct pm121_correction {
 284         int     offset;
 285         int     slope;
 286 };
 287
 288 static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = {
 289         /* FAN_OD */
 290         {
 291                 /* MODEL 2 */
 292                 { .offset       = -19563152,
 293                   .slope        =  1956315
 294                 },
 295                 /* MODEL 3 */
 296                 { .offset       = -15650652,
 297                   .slope        =  1565065
 298                 },
 299         },
 300         /* FAN_HD */
 301         {
 302                 /* MODEL 2 */
 303                 { .offset       = -15650652,
 304                   .slope        =  1565065
 305                 },
 306                 /* MODEL 3 */
 307                 { .offset       = -19563152,
 308                   .slope        =  1956315
 309                 },
 310         },
 311         /* FAN_CPU */
 312         {
 313                 /* MODEL 2 */
 314                 { .offset       = -25431900,
 315                   .slope        =  2543190
 316                 },
 317                 /* MODEL 3 */
 318                 { .offset       = -15650652,
 319                   .slope        =  1565065
 320                 },
 321         },
 322         /* CPUFREQ has no correction (and is not implemented at all) */
 323 };
 324
 325 struct pm121_connection {
 326         unsigned int    control_id;
 327         unsigned int    ref_id;
 328         struct pm121_correction correction;
 329 };
 330
 331 static struct pm121_connection pm121_connections[] = {
 332         /* MODEL 2 */
 333         { .control_id   = FAN_CPU,
 334           .ref_id       = FAN_OD,
 335           { .offset     = -32768000,
 336             .slope      =  65536
 337           }
 338         },
 339         /* MODEL 3 */
 340         { .control_id   = FAN_OD,
 341           .ref_id       = FAN_HD,
 342           { .offset     = -32768000,
 343             .slope      =  65536
 344           }
 345         },
 346 };
 347
 348 /* pointer to the current model connection */
 349 static struct pm121_connection *pm121_connection;
 350
 351 /*
 352  * ****** System Fans Control Loop ******
 353  *
 354  */
 355
 356 /* Since each loop handles only one control and we want to avoid
 357  * writing virtual control, we store the control correction with the
 358  * loop params. Some data are not set, there are common to all loop
 359  * and thus, hardcoded.
 360  */
 361 struct pm121_sys_param {
 362         /* purely informative since we use mach_model-2 as index */
 363         int                     model_id;
 364         struct wf_sensor        **sensor; /* use sensor_id instead ? */
 365         s32                     gp, itarget;
 366         unsigned int            control_id;
 367 };
 368
 369 static struct pm121_sys_param
 370 pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = {
 371         /* GPU Fan control loop */
 372         {
 373                 { .model_id     = 2,
 374                   .sensor       = &sensor_gpu_temp,
 375                   .gp           = 0x002A6666,
 376                   .itarget      = 0x5A0000,
 377                   .control_id   = FAN_HD,
 378                 },
 379                 { .model_id     = 3,
 380                   .sensor       = &sensor_gpu_temp,
 381                   .gp           = 0x0010CCCC,
 382                   .itarget      = 0x500000,
 383                   .control_id   = FAN_CPU,
 384                 },
 385         },
 386         /* HD Fan control loop */
 387         {
 388                 { .model_id     = 2,
 389                   .sensor       = &sensor_hard_drive_temp,
 390                   .gp           = 0x002D70A3,
 391                   .itarget      = 0x370000,
 392                   .control_id   = FAN_HD,
 393                 },
 394                 { .model_id     = 3,
 395                   .sensor       = &sensor_hard_drive_temp,
 396                   .gp           = 0x002170A3,
 397                   .itarget      = 0x370000,
 398                   .control_id   = FAN_HD,
 399                 },
 400         },
 401         /* KODIAK Fan control loop */
 402         {
 403                 { .model_id     = 2,
 404                   .sensor       = &sensor_north_bridge_temp,
 405                   .gp           = 0x003BD70A,
 406                   .itarget      = 0x550000,
 407                   .control_id   = FAN_OD,
 408                 },
 409                 { .model_id     = 3,
 410                   .sensor       = &sensor_north_bridge_temp,
 411                   .gp           = 0x0030F5C2,
 412                   .itarget      = 0x550000,
 413                   .control_id   = FAN_HD,
 414                 },
 415         },
 416         /* OD Fan control loop */
 417         {
 418                 { .model_id     = 2,
 419                   .sensor       = &sensor_optical_drive_temp,
 420                   .gp           = 0x001FAE14,
 421                   .itarget      = 0x320000,
 422                   .control_id   = FAN_OD,
 423                 },
 424                 { .model_id     = 3,
 425                   .sensor       = &sensor_optical_drive_temp,
 426                   .gp           = 0x001FAE14,
 427                   .itarget      = 0x320000,
 428                   .control_id   = FAN_OD,
 429                 },
 430         },
 431 };
 432
 433 /* the hardcoded values */
 434 #define PM121_SYS_GD            0x00000000
 435 #define PM121_SYS_GR            0x00019999
 436 #define PM121_SYS_HISTORY_SIZE  2
 437 #define PM121_SYS_INTERVAL      5
 438
 439 /* State data used by the system fans control loop
 440  */
 441 struct pm121_sys_state {
 442         int                     ticks;
 443         s32                     setpoint;
 444         struct wf_pid_state     pid;
 445 };
 446
 447 struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {};
 448
 449 /*
 450  * ****** CPU Fans Control Loop ******
 451  *
 452  */
 453
 454 #define PM121_CPU_INTERVAL      1
 455
 456 /* State data used by the cpu fans control loop
 457  */
 458 struct pm121_cpu_state {
 459         int                     ticks;
 460         s32                     setpoint;
 461         struct wf_cpu_pid_state pid;
 462 };
 463
 464 static struct pm121_cpu_state *pm121_cpu_state;
 465
 466
 467
 468 /*
 469  * ***** Implementation *****
 470  *
 471  */
 472
 473 /* correction the value using the output-low-bound correction algo */
 474 static s32 pm121_correct(s32 new_setpoint,
 475                          unsigned int control_id,
 476                          s32 min)
 477 {
 478         s32 new_min;
 479         struct pm121_correction *correction;
 480         correction = &corrections[control_id][pm121_mach_model - 2];
 481
 482         new_min = (average_power * correction->slope) >> 16;
 483         new_min += correction->offset;
 484         new_min = (new_min >> 16) + min;
 485
 486         return max3(new_setpoint, new_min, 0);
 487 }
 488
 489 static s32 pm121_connect(unsigned int control_id, s32 setpoint)
 490 {
 491         s32 new_min, value, new_setpoint;
 492
 493         if (pm121_connection->control_id == control_id) {
 494                 controls[control_id]->ops->get_value(controls[control_id],
 495                                                      &value);
 496                 new_min = value * pm121_connection->correction.slope;
 497                 new_min += pm121_connection->correction.offset;
 498                 if (new_min > 0) {
 499                         new_setpoint = max(setpoint, (new_min >> 16));
 500                         if (new_setpoint != setpoint) {
 501                                 pr_debug("pm121: %s depending on %s, "
 502                                          "corrected from %d to %d RPM\n",
 503                                          controls[control_id]->name,
 504                                          controls[pm121_connection->ref_id]->name,
 505                                          (int) setpoint, (int) new_setpoint);
 506                         }
 507                 } else
 508                         new_setpoint = setpoint;
 509         }
 510         /* no connection */
 511         else
 512                 new_setpoint = setpoint;
 513
 514         return new_setpoint;
 515 }
 516
 517 /* FAN LOOPS */
 518 static void pm121_create_sys_fans(int loop_id)
 519 {
 520         struct pm121_sys_param *param = NULL;
 521         struct wf_pid_param pid_param;
 522         struct wf_control *control = NULL;
 523         int i;
 524
 525         /* First, locate the params for this model */
 526         for (i = 0; i < PM121_NUM_CONFIGS; i++) {
 527                 if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) {
 528                         param = &(pm121_sys_all_params[loop_id][i]);
 529                         break;
 530                 }
 531         }
 532
 533         /* No params found, put fans to max */
 534         if (param == NULL) {
 535                 printk(KERN_WARNING "pm121: %s fan config not found "
 536                        " for this machine model\n",
 537                        loop_names[loop_id]);
 538                 goto fail;
 539         }
 540
 541         control = controls[param->control_id];
 542
 543         /* Alloc & initialize state */
 544         pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state),
 545                                            GFP_KERNEL);
 546         if (pm121_sys_state[loop_id] == NULL) {
 547                 printk(KERN_WARNING "pm121: Memory allocation error\n");
 548                 goto fail;
 549         }
 550         pm121_sys_state[loop_id]->ticks = 1;
 551
 552         /* Fill PID params */
 553         pid_param.gd            = PM121_SYS_GD;
 554         pid_param.gp            = param->gp;
 555         pid_param.gr            = PM121_SYS_GR;
 556         pid_param.interval      = PM121_SYS_INTERVAL;
 557         pid_param.history_len   = PM121_SYS_HISTORY_SIZE;
 558         pid_param.itarget       = param->itarget;
 559         if(control)
 560         {
 561                 pid_param.min           = control->ops->get_min(control);
 562                 pid_param.max           = control->ops->get_max(control);
 563         } else {
 564                 /*
 565                  * This is probably not the right!?
 566                  * Perhaps goto fail  if control == NULL  above?
 567                  */
 568                 pid_param.min           = 0;
 569                 pid_param.max           = 0;
 570         }
 571
 572         wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param);
 573
 574         pr_debug("pm121: %s Fan control loop initialized.\n"
 575                  "       itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 576                  loop_names[loop_id], FIX32TOPRINT(pid_param.itarget),
 577                  pid_param.min, pid_param.max);
 578         return;
 579
 580  fail:
 581         /* note that this is not optimal since another loop may still
 582            control the same control */
 583         printk(KERN_WARNING "pm121: failed to set up %s loop "
 584                "setting \"%s\" to max speed.\n",
 585                loop_names[loop_id], control ? control->name : "uninitialized value");
 586
 587         if (control)
 588                 wf_control_set_max(control);
 589 }
 590
 591 static void pm121_sys_fans_tick(int loop_id)
 592 {
 593         struct pm121_sys_param *param;
 594         struct pm121_sys_state *st;
 595         struct wf_sensor *sensor;
 596         struct wf_control *control;
 597         s32 temp, new_setpoint;
 598         int rc;
 599
 600         param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]);
 601         st = pm121_sys_state[loop_id];
 602         sensor = *(param->sensor);
 603         control = controls[param->control_id];
 604
 605         if (--st->ticks != 0) {
 606                 if (pm121_readjust)
 607                         goto readjust;
 608                 return;
 609         }
 610         st->ticks = PM121_SYS_INTERVAL;
 611
 612         rc = sensor->ops->get_value(sensor, &temp);
 613         if (rc) {
 614                 printk(KERN_WARNING "windfarm: %s sensor error %d\n",
 615                        sensor->name, rc);
 616                 pm121_failure_state |= FAILURE_SENSOR;
 617                 return;
 618         }
 619
 620         pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n",
 621                  loop_names[loop_id], sensor->name,
 622                  FIX32TOPRINT(temp));
 623
 624         new_setpoint = wf_pid_run(&st->pid, temp);
 625
 626         /* correction */
 627         new_setpoint = pm121_correct(new_setpoint,
 628                                      param->control_id,
 629                                      st->pid.param.min);
 630         /* linked corretion */
 631         new_setpoint = pm121_connect(param->control_id, new_setpoint);
 632
 633         if (new_setpoint == st->setpoint)
 634                 return;
 635         st->setpoint = new_setpoint;
 636         pr_debug("pm121: %s corrected setpoint: %d RPM\n",
 637                  control->name, (int)new_setpoint);
 638  readjust:
 639         if (control && pm121_failure_state == 0) {
 640                 rc = control->ops->set_value(control, st->setpoint);
 641                 if (rc) {
 642                         printk(KERN_WARNING "windfarm: %s fan error %d\n",
 643                                control->name, rc);
 644                         pm121_failure_state |= FAILURE_FAN;
 645                 }
 646         }
 647 }
 648
 649
 650 /* CPU LOOP */
 651 static void pm121_create_cpu_fans(void)
 652 {
 653         struct wf_cpu_pid_param pid_param;
 654         const struct smu_sdbp_header *hdr;
 655         struct smu_sdbp_cpupiddata *piddata;
 656         struct smu_sdbp_fvt *fvt;
 657         struct wf_control *fan_cpu;
 658         s32 tmax, tdelta, maxpow, powadj;
 659
 660         fan_cpu = controls[FAN_CPU];
 661
 662         /* First, locate the PID params in SMU SBD */
 663         hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
 664         if (hdr == 0) {
 665                 printk(KERN_WARNING "pm121: CPU PID fan config not found.\n");
 666                 goto fail;
 667         }
 668         piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
 669
 670         /* Get the FVT params for operating point 0 (the only supported one
 671          * for now) in order to get tmax
 672          */
 673         hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
 674         if (hdr) {
 675                 fvt = (struct smu_sdbp_fvt *)&hdr[1];
 676                 tmax = ((s32)fvt->maxtemp) << 16;
 677         } else
 678                 tmax = 0x5e0000; /* 94 degree default */
 679
 680         /* Alloc & initialize state */
 681         pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state),
 682                                   GFP_KERNEL);
 683         if (pm121_cpu_state == NULL)
 684                 goto fail;
 685         pm121_cpu_state->ticks = 1;
 686
 687         /* Fill PID params */
 688         pid_param.interval = PM121_CPU_INTERVAL;
 689         pid_param.history_len = piddata->history_len;
 690         if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
 691                 printk(KERN_WARNING "pm121: History size overflow on "
 692                        "CPU control loop (%d)\n", piddata->history_len);
 693                 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
 694         }
 695         pid_param.gd = piddata->gd;
 696         pid_param.gp = piddata->gp;
 697         pid_param.gr = piddata->gr / pid_param.history_len;
 698
 699         tdelta = ((s32)piddata->target_temp_delta) << 16;
 700         maxpow = ((s32)piddata->max_power) << 16;
 701         powadj = ((s32)piddata->power_adj) << 16;
 702
 703         pid_param.tmax = tmax;
 704         pid_param.ttarget = tmax - tdelta;
 705         pid_param.pmaxadj = maxpow - powadj;
 706
 707         pid_param.min = fan_cpu->ops->get_min(fan_cpu);
 708         pid_param.max = fan_cpu->ops->get_max(fan_cpu);
 709
 710         wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param);
 711
 712         pr_debug("pm121: CPU Fan control initialized.\n");
 713         pr_debug("       ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n",
 714                  FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
 715                  pid_param.min, pid_param.max);
 716
 717         return;
 718
 719  fail:
 720         printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n");
 721
 722         if (controls[CPUFREQ])
 723                 wf_control_set_max(controls[CPUFREQ]);
 724         if (fan_cpu)
 725                 wf_control_set_max(fan_cpu);
 726 }
 727
 728
 729 static void pm121_cpu_fans_tick(struct pm121_cpu_state *st)
 730 {
 731         s32 new_setpoint, temp, power;
 732         struct wf_control *fan_cpu = NULL;
 733         int rc;
 734
 735         if (--st->ticks != 0) {
 736                 if (pm121_readjust)
 737                         goto readjust;
 738                 return;
 739         }
 740         st->ticks = PM121_CPU_INTERVAL;
 741
 742         fan_cpu = controls[FAN_CPU];
 743
 744         rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
 745         if (rc) {
 746                 printk(KERN_WARNING "pm121: CPU temp sensor error %d\n",
 747                        rc);
 748                 pm121_failure_state |= FAILURE_SENSOR;
 749                 return;
 750         }
 751
 752         rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
 753         if (rc) {
 754                 printk(KERN_WARNING "pm121: CPU power sensor error %d\n",
 755                        rc);
 756                 pm121_failure_state |= FAILURE_SENSOR;
 757                 return;
 758         }
 759
 760         pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n",
 761                  FIX32TOPRINT(temp), FIX32TOPRINT(power));
 762
 763         if (temp > st->pid.param.tmax)
 764                 pm121_failure_state |= FAILURE_OVERTEMP;
 765
 766         new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
 767
 768         /* correction */
 769         new_setpoint = pm121_correct(new_setpoint,
 770                                      FAN_CPU,
 771                                      st->pid.param.min);
 772
 773         /* connected correction */
 774         new_setpoint = pm121_connect(FAN_CPU, new_setpoint);
 775
 776         if (st->setpoint == new_setpoint)
 777                 return;
 778         st->setpoint = new_setpoint;
 779         pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint);
 780
 781  readjust:
 782         if (fan_cpu && pm121_failure_state == 0) {
 783                 rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint);
 784                 if (rc) {
 785                         printk(KERN_WARNING "pm121: %s fan error %d\n",
 786                                fan_cpu->name, rc);
 787                         pm121_failure_state |= FAILURE_FAN;
 788                 }
 789         }
 790 }
 791
 792 /*
 793  * ****** Common ******
 794  *
 795  */
 796
 797 static void pm121_tick(void)
 798 {
 799         unsigned int last_failure = pm121_failure_state;
 800         unsigned int new_failure;
 801         s32 total_power;
 802         int i;
 803
 804         if (!pm121_started) {
 805                 pr_debug("pm121: creating control loops !\n");
 806                 for (i = 0; i < N_LOOPS; i++)
 807                         pm121_create_sys_fans(i);
 808
 809                 pm121_create_cpu_fans();
 810                 pm121_started = true;
 811         }
 812
 813         /* skipping ticks */
 814         if (pm121_skipping && --pm121_skipping)
 815                 return;
 816
 817         /* compute average power */
 818         total_power = 0;
 819         for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++)
 820                 total_power += pm121_cpu_state->pid.powers[i];
 821
 822         average_power = total_power / pm121_cpu_state->pid.param.history_len;
 823
 824
 825         pm121_failure_state = 0;
 826         for (i = 0 ; i < N_LOOPS; i++) {
 827                 if (pm121_sys_state[i])
 828                         pm121_sys_fans_tick(i);
 829         }
 830
 831         if (pm121_cpu_state)
 832                 pm121_cpu_fans_tick(pm121_cpu_state);
 833
 834         pm121_readjust = 0;
 835         new_failure = pm121_failure_state & ~last_failure;
 836
 837         /* If entering failure mode, clamp cpufreq and ramp all
 838          * fans to full speed.
 839          */
 840         if (pm121_failure_state && !last_failure) {
 841                 for (i = 0; i < N_CONTROLS; i++) {
 842                         if (controls[i])
 843                                 wf_control_set_max(controls[i]);
 844                 }
 845         }
 846
 847         /* If leaving failure mode, unclamp cpufreq and readjust
 848          * all fans on next iteration
 849          */
 850         if (!pm121_failure_state && last_failure) {
 851                 if (controls[CPUFREQ])
 852                         wf_control_set_min(controls[CPUFREQ]);
 853                 pm121_readjust = 1;
 854         }
 855
 856         /* Overtemp condition detected, notify and start skipping a couple
 857          * ticks to let the temperature go down
 858          */
 859         if (new_failure & FAILURE_OVERTEMP) {
 860                 wf_set_overtemp();
 861                 pm121_skipping = 2;
 862                 pm121_overtemp = true;
 863         }
 864
 865         /* We only clear the overtemp condition if overtemp is cleared
 866          * _and_ no other failure is present. Since a sensor error will
 867          * clear the overtemp condition (can't measure temperature) at
 868          * the control loop levels, but we don't want to keep it clear
 869          * here in this case
 870          */
 871         if (!pm121_failure_state && pm121_overtemp) {
 872                 wf_clear_overtemp();
 873                 pm121_overtemp = false;
 874         }
 875 }
 876
 877
 878 static struct wf_control* pm121_register_control(struct wf_control *ct,
 879                                                  const char *match,
 880                                                  unsigned int id)
 881 {
 882         if (controls[id] == NULL && !strcmp(ct->name, match)) {
 883                 if (wf_get_control(ct) == 0)
 884                         controls[id] = ct;
 885         }
 886         return controls[id];
 887 }
 888
 889 static void pm121_new_control(struct wf_control *ct)
 890 {
 891         int all = 1;
 892
 893         if (pm121_all_controls_ok)
 894                 return;
 895
 896         all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all;
 897         all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all;
 898         all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all;
 899         all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all;
 900
 901         if (all)
 902                 pm121_all_controls_ok = 1;
 903 }
 904
 905
 906
 907
 908 static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor,
 909                                                const char *match,
 910                                                struct wf_sensor **var)
 911 {
 912         if (*var == NULL && !strcmp(sensor->name, match)) {
 913                 if (wf_get_sensor(sensor) == 0)
 914                         *var = sensor;
 915         }
 916         return *var;
 917 }
 918
 919 static void pm121_new_sensor(struct wf_sensor *sr)
 920 {
 921         int all = 1;
 922
 923         if (pm121_all_sensors_ok)
 924                 return;
 925
 926         all = pm121_register_sensor(sr, "cpu-temp",
 927                                     &sensor_cpu_temp) && all;
 928         all = pm121_register_sensor(sr, "cpu-current",
 929                                     &sensor_cpu_current) && all;
 930         all = pm121_register_sensor(sr, "cpu-voltage",
 931                                     &sensor_cpu_voltage) && all;
 932         all = pm121_register_sensor(sr, "cpu-power",
 933                                     &sensor_cpu_power) && all;
 934         all = pm121_register_sensor(sr, "hard-drive-temp",
 935                                     &sensor_hard_drive_temp) && all;
 936         all = pm121_register_sensor(sr, "optical-drive-temp",
 937                                     &sensor_optical_drive_temp) && all;
 938         all = pm121_register_sensor(sr, "incoming-air-temp",
 939                                     &sensor_incoming_air_temp) && all;
 940         all = pm121_register_sensor(sr, "north-bridge-temp",
 941                                     &sensor_north_bridge_temp) && all;
 942         all = pm121_register_sensor(sr, "gpu-temp",
 943                                     &sensor_gpu_temp) && all;
 944
 945         if (all)
 946                 pm121_all_sensors_ok = 1;
 947 }
 948
 949
 950
 951 static int pm121_notify(struct notifier_block *self,
 952                         unsigned long event, void *data)
 953 {
 954         switch (event) {
 955         case WF_EVENT_NEW_CONTROL:
 956                 pr_debug("pm121: new control %s detected\n",
 957                          ((struct wf_control *)data)->name);
 958                 pm121_new_control(data);
 959                 break;
 960         case WF_EVENT_NEW_SENSOR:
 961                 pr_debug("pm121: new sensor %s detected\n",
 962                          ((struct wf_sensor *)data)->name);
 963                 pm121_new_sensor(data);
 964                 break;
 965         case WF_EVENT_TICK:
 966                 if (pm121_all_controls_ok && pm121_all_sensors_ok)
 967                         pm121_tick();
 968                 break;
 969         }
 970
 971         return 0;
 972 }
 973
 974 static struct notifier_block pm121_events = {
 975         .notifier_call  = pm121_notify,
 976 };
 977
 978 static int pm121_init_pm(void)
 979 {
 980         const struct smu_sdbp_header *hdr;
 981
 982         hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
 983         if (hdr != 0) {
 984                 struct smu_sdbp_sensortree *st =
 985                         (struct smu_sdbp_sensortree *)&hdr[1];
 986                 pm121_mach_model = st->model_id;
 987         }
 988
 989         pm121_connection = &pm121_connections[pm121_mach_model - 2];
 990
 991         printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n",
 992                pm121_mach_model);
 993
 994         return 0;
 995 }
 996
 997
 998 static int pm121_probe(struct platform_device *ddev)
 999 {
1000         wf_register_client(&pm121_events);
1001
1002         return 0;
1003 }
1004
1005 static int pm121_remove(struct platform_device *ddev)
1006 {
1007         wf_unregister_client(&pm121_events);
1008         return 0;
1009 }
1010
1011 static struct platform_driver pm121_driver = {
1012         .probe = pm121_probe,
1013         .remove = pm121_remove,
1014         .driver = {
1015                 .name = "windfarm",
1016                 .bus = &platform_bus_type,
1017         },
1018 };
1019
1020
1021 static int __init pm121_init(void)
1022 {
1023         int rc = -ENODEV;
1024
1025         if (of_machine_is_compatible("PowerMac12,1"))
1026                 rc = pm121_init_pm();
1027
1028         if (rc == 0) {
1029                 request_module("windfarm_smu_controls");
1030                 request_module("windfarm_smu_sensors");
1031                 request_module("windfarm_smu_sat");
1032                 request_module("windfarm_lm75_sensor");
1033                 request_module("windfarm_max6690_sensor");
1034                 request_module("windfarm_cpufreq_clamp");
1035                 platform_driver_register(&pm121_driver);
1036         }
1037
1038         return rc;
1039 }
1040
1041 static void __exit pm121_exit(void)
1042 {
1043
1044         platform_driver_unregister(&pm121_driver);
1045 }
1046
1047
1048 module_init(pm121_init);
1049 module_exit(pm121_exit);
1050
1051 MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>");
1052 MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");
1053 MODULE_LICENSE("GPL");
1054