linux/drivers/macintosh/windfarm_pm121.c
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   1/*
   2 * Windfarm PowerMac thermal control. iMac G5 iSight
   3 *
   4 * (c) Copyright 2007 Étienne Bersac <bersace@gmail.com>
   5 *
   6 * Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin
   7 * Herrenschmidt, IBM Corp. <benh@kernel.crashing.org>
   8 *
   9 * Released under the term of the GNU GPL v2.
  10 *
  11 *
  12 *
  13 * PowerMac12,1
  14 * ============
  15 *
  16 *
  17 * The algorithm used is the PID control algorithm, used the same way
  18 * the published Darwin code does, using the same values that are
  19 * present in the Darwin 8.10 snapshot property lists (note however
  20 * that none of the code has been re-used, it's a complete
  21 * re-implementation
  22 *
  23 * There is two models using PowerMac12,1. Model 2 is iMac G5 iSight
  24 * 17" while Model 3 is iMac G5 20". They do have both the same
  25 * controls with a tiny difference. The control-ids of hard-drive-fan
  26 * and cpu-fan is swapped.
  27 *
  28 *
  29 * Target Correction :
  30 *
  31 * controls have a target correction calculated as :
  32 *
  33 * new_min = ((((average_power * slope) >> 16) + offset) >> 16) + min_value
  34 * new_value = max(new_value, max(new_min, 0))
  35 *
  36 * OD Fan control correction.
  37 *
  38 * # model_id: 2
  39 *   offset             : -19563152
  40 *   slope              :  1956315
  41 *
  42 * # model_id: 3
  43 *   offset             : -15650652
  44 *   slope              :  1565065
  45 *
  46 * HD Fan control correction.
  47 *
  48 * # model_id: 2
  49 *   offset             : -15650652
  50 *   slope              :  1565065
  51 *
  52 * # model_id: 3
  53 *   offset             : -19563152
  54 *   slope              :  1956315
  55 *
  56 * CPU Fan control correction.
  57 *
  58 * # model_id: 2
  59 *   offset             : -25431900
  60 *   slope              :  2543190
  61 *
  62 * # model_id: 3
  63 *   offset             : -15650652
  64 *   slope              :  1565065
  65 *
  66 *
  67 * Target rubber-banding :
  68 *
  69 * Some controls have a target correction which depends on another
  70 * control value. The correction is computed in the following way :
  71 *
  72 * new_min = ref_value * slope + offset
  73 *
  74 * ref_value is the value of the reference control. If new_min is
  75 * greater than 0, then we correct the target value using :
  76 *
  77 * new_target = max (new_target, new_min >> 16)
  78 *
  79 *
  80 * # model_id : 2
  81 *   control    : cpu-fan
  82 *   ref        : optical-drive-fan
  83 *   offset     : -15650652
  84 *   slope      : 1565065
  85 *
  86 * # model_id : 3
  87 *   control    : optical-drive-fan
  88 *   ref        : hard-drive-fan
  89 *   offset     : -32768000
  90 *   slope      : 65536
  91 *
  92 *
  93 * In order to have the moste efficient correction with those
  94 * dependencies, we must trigger HD loop before OD loop before CPU
  95 * loop.
  96 *
  97 *
  98 * The various control loops found in Darwin config file are:
  99 *
 100 * HD Fan control loop.
 101 *
 102 * # model_id: 2
 103 *   control        : hard-drive-fan
 104 *   sensor         : hard-drive-temp
 105 *   PID params     : G_d = 0x00000000
 106 *                    G_p = 0x002D70A3
 107 *                    G_r = 0x00019999
 108 *                    History = 2 entries
 109 *                    Input target = 0x370000
 110 *                    Interval = 5s
 111 *
 112 * # model_id: 3
 113 *   control        : hard-drive-fan
 114 *   sensor         : hard-drive-temp
 115 *   PID params     : G_d = 0x00000000
 116 *                    G_p = 0x002170A3
 117 *                    G_r = 0x00019999
 118 *                    History = 2 entries
 119 *                    Input target = 0x370000
 120 *                    Interval = 5s
 121 *
 122 * OD Fan control loop.
 123 *
 124 * # model_id: 2
 125 *   control        : optical-drive-fan
 126 *   sensor         : optical-drive-temp
 127 *   PID params     : G_d = 0x00000000
 128 *                    G_p = 0x001FAE14
 129 *                    G_r = 0x00019999
 130 *                    History = 2 entries
 131 *                    Input target = 0x320000
 132 *                    Interval = 5s
 133 *
 134 * # model_id: 3
 135 *   control        : optical-drive-fan
 136 *   sensor         : optical-drive-temp
 137 *   PID params     : G_d = 0x00000000
 138 *                    G_p = 0x001FAE14
 139 *                    G_r = 0x00019999
 140 *                    History = 2 entries
 141 *                    Input target = 0x320000
 142 *                    Interval = 5s
 143 *
 144 * GPU Fan control loop.
 145 *
 146 * # model_id: 2
 147 *   control        : hard-drive-fan
 148 *   sensor         : gpu-temp
 149 *   PID params     : G_d = 0x00000000
 150 *                    G_p = 0x002A6666
 151 *                    G_r = 0x00019999
 152 *                    History = 2 entries
 153 *                    Input target = 0x5A0000
 154 *                    Interval = 5s
 155 *
 156 * # model_id: 3
 157 *   control        : cpu-fan
 158 *   sensor         : gpu-temp
 159 *   PID params     : G_d = 0x00000000
 160 *                    G_p = 0x0010CCCC
 161 *                    G_r = 0x00019999
 162 *                    History = 2 entries
 163 *                    Input target = 0x500000
 164 *                    Interval = 5s
 165 *
 166 * KODIAK (aka northbridge) Fan control loop.
 167 *
 168 * # model_id: 2
 169 *   control        : optical-drive-fan
 170 *   sensor         : north-bridge-temp
 171 *   PID params     : G_d = 0x00000000
 172 *                    G_p = 0x003BD70A
 173 *                    G_r = 0x00019999
 174 *                    History = 2 entries
 175 *                    Input target = 0x550000
 176 *                    Interval = 5s
 177 *
 178 * # model_id: 3
 179 *   control        : hard-drive-fan
 180 *   sensor         : north-bridge-temp
 181 *   PID params     : G_d = 0x00000000
 182 *                    G_p = 0x0030F5C2
 183 *                    G_r = 0x00019999
 184 *                    History = 2 entries
 185 *                    Input target = 0x550000
 186 *                    Interval = 5s
 187 *
 188 * CPU Fan control loop.
 189 *
 190 *   control        : cpu-fan
 191 *   sensors        : cpu-temp, cpu-power
 192 *   PID params     : from SDB partition
 193 *
 194 *
 195 * CPU Slew control loop.
 196 *
 197 *   control        : cpufreq-clamp
 198 *   sensor         : cpu-temp
 199 *
 200 */
 201
 202#undef  DEBUG
 203
 204#include <linux/types.h>
 205#include <linux/errno.h>
 206#include <linux/kernel.h>
 207#include <linux/delay.h>
 208#include <linux/slab.h>
 209#include <linux/init.h>
 210#include <linux/spinlock.h>
 211#include <linux/wait.h>
 212#include <linux/kmod.h>
 213#include <linux/device.h>
 214#include <linux/platform_device.h>
 215#include <asm/prom.h>
 216#include <asm/machdep.h>
 217#include <asm/io.h>
 218#include <asm/sections.h>
 219#include <asm/smu.h>
 220
 221#include "windfarm.h"
 222#include "windfarm_pid.h"
 223
 224#define VERSION "0.3"
 225
 226static int pm121_mach_model;    /* machine model id */
 227
 228/* Controls & sensors */
 229static struct wf_sensor *sensor_cpu_power;
 230static struct wf_sensor *sensor_cpu_temp;
 231static struct wf_sensor *sensor_cpu_voltage;
 232static struct wf_sensor *sensor_cpu_current;
 233static struct wf_sensor *sensor_gpu_temp;
 234static struct wf_sensor *sensor_north_bridge_temp;
 235static struct wf_sensor *sensor_hard_drive_temp;
 236static struct wf_sensor *sensor_optical_drive_temp;
 237static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */
 238
 239enum {
 240        FAN_CPU,
 241        FAN_HD,
 242        FAN_OD,
 243        CPUFREQ,
 244        N_CONTROLS
 245};
 246static struct wf_control *controls[N_CONTROLS] = {};
 247
 248/* Set to kick the control loop into life */
 249static int pm121_all_controls_ok, pm121_all_sensors_ok, pm121_started;
 250
 251enum {
 252        FAILURE_FAN             = 1 << 0,
 253        FAILURE_SENSOR          = 1 << 1,
 254        FAILURE_OVERTEMP        = 1 << 2
 255};
 256
 257/* All sys loops. Note the HD before the OD loop in order to have it
 258   run before. */
 259enum {
 260        LOOP_GPU,               /* control = hd or cpu, but luckily,
 261                                   it doesn't matter */
 262        LOOP_HD,                /* control = hd */
 263        LOOP_KODIAK,            /* control = hd or od */
 264        LOOP_OD,                /* control = od */
 265        N_LOOPS
 266};
 267
 268static const char *loop_names[N_LOOPS] = {
 269        "GPU",
 270        "HD",
 271        "KODIAK",
 272        "OD",
 273};
 274
 275#define PM121_NUM_CONFIGS       2
 276
 277static unsigned int pm121_failure_state;
 278static int pm121_readjust, pm121_skipping;
 279static s32 average_power;
 280
 281struct pm121_correction {
 282        int     offset;
 283        int     slope;
 284};
 285
 286static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = {
 287        /* FAN_OD */
 288        {
 289                /* MODEL 2 */
 290                { .offset       = -19563152,
 291                  .slope        =  1956315
 292                },
 293                /* MODEL 3 */
 294                { .offset       = -15650652,
 295                  .slope        =  1565065
 296                },
 297        },
 298        /* FAN_HD */
 299        {
 300                /* MODEL 2 */
 301                { .offset       = -15650652,
 302                  .slope        =  1565065
 303                },
 304                /* MODEL 3 */
 305                { .offset       = -19563152,
 306                  .slope        =  1956315
 307                },
 308        },
 309        /* FAN_CPU */
 310        {
 311                /* MODEL 2 */
 312                { .offset       = -25431900,
 313                  .slope        =  2543190
 314                },
 315                /* MODEL 3 */
 316                { .offset       = -15650652,
 317                  .slope        =  1565065
 318                },
 319        },
 320        /* CPUFREQ has no correction (and is not implemented at all) */
 321};
 322
 323struct pm121_connection {
 324        unsigned int    control_id;
 325        unsigned int    ref_id;
 326        struct pm121_correction correction;
 327};
 328
 329static struct pm121_connection pm121_connections[] = {
 330        /* MODEL 2 */
 331        { .control_id   = FAN_CPU,
 332          .ref_id       = FAN_OD,
 333          { .offset     = -32768000,
 334            .slope      =  65536
 335          }
 336        },
 337        /* MODEL 3 */
 338        { .control_id   = FAN_OD,
 339          .ref_id       = FAN_HD,
 340          { .offset     = -32768000,
 341            .slope      =  65536
 342          }
 343        },
 344};
 345
 346/* pointer to the current model connection */
 347static struct pm121_connection *pm121_connection;
 348
 349/*
 350 * ****** System Fans Control Loop ******
 351 *
 352 */
 353
 354/* Since each loop handles only one control and we want to avoid
 355 * writing virtual control, we store the control correction with the
 356 * loop params. Some data are not set, there are common to all loop
 357 * and thus, hardcoded.
 358 */
 359struct pm121_sys_param {
 360        /* purely informative since we use mach_model-2 as index */
 361        int                     model_id;
 362        struct wf_sensor        **sensor; /* use sensor_id instead ? */
 363        s32                     gp, itarget;
 364        unsigned int            control_id;
 365};
 366
 367static struct pm121_sys_param
 368pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = {
 369        /* GPU Fan control loop */
 370        {
 371                { .model_id     = 2,
 372                  .sensor       = &sensor_gpu_temp,
 373                  .gp           = 0x002A6666,
 374                  .itarget      = 0x5A0000,
 375                  .control_id   = FAN_HD,
 376                },
 377                { .model_id     = 3,
 378                  .sensor       = &sensor_gpu_temp,
 379                  .gp           = 0x0010CCCC,
 380                  .itarget      = 0x500000,
 381                  .control_id   = FAN_CPU,
 382                },
 383        },
 384        /* HD Fan control loop */
 385        {
 386                { .model_id     = 2,
 387                  .sensor       = &sensor_hard_drive_temp,
 388                  .gp           = 0x002D70A3,
 389                  .itarget      = 0x370000,
 390                  .control_id   = FAN_HD,
 391                },
 392                { .model_id     = 3,
 393                  .sensor       = &sensor_hard_drive_temp,
 394                  .gp           = 0x002170A3,
 395                  .itarget      = 0x370000,
 396                  .control_id   = FAN_HD,
 397                },
 398        },
 399        /* KODIAK Fan control loop */
 400        {
 401                { .model_id     = 2,
 402                  .sensor       = &sensor_north_bridge_temp,
 403                  .gp           = 0x003BD70A,
 404                  .itarget      = 0x550000,
 405                  .control_id   = FAN_OD,
 406                },
 407                { .model_id     = 3,
 408                  .sensor       = &sensor_north_bridge_temp,
 409                  .gp           = 0x0030F5C2,
 410                  .itarget      = 0x550000,
 411                  .control_id   = FAN_HD,
 412                },
 413        },
 414        /* OD Fan control loop */
 415        {
 416                { .model_id     = 2,
 417                  .sensor       = &sensor_optical_drive_temp,
 418                  .gp           = 0x001FAE14,
 419                  .itarget      = 0x320000,
 420                  .control_id   = FAN_OD,
 421                },
 422                { .model_id     = 3,
 423                  .sensor       = &sensor_optical_drive_temp,
 424                  .gp           = 0x001FAE14,
 425                  .itarget      = 0x320000,
 426                  .control_id   = FAN_OD,
 427                },
 428        },
 429};
 430
 431/* the hardcoded values */
 432#define PM121_SYS_GD            0x00000000
 433#define PM121_SYS_GR            0x00019999
 434#define PM121_SYS_HISTORY_SIZE  2
 435#define PM121_SYS_INTERVAL      5
 436
 437/* State data used by the system fans control loop
 438 */
 439struct pm121_sys_state {
 440        int                     ticks;
 441        s32                     setpoint;
 442        struct wf_pid_state     pid;
 443};
 444
 445struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {};
 446
 447/*
 448 * ****** CPU Fans Control Loop ******
 449 *
 450 */
 451
 452#define PM121_CPU_INTERVAL      1
 453
 454/* State data used by the cpu fans control loop
 455 */
 456struct pm121_cpu_state {
 457        int                     ticks;
 458        s32                     setpoint;
 459        struct wf_cpu_pid_state pid;
 460};
 461
 462static struct pm121_cpu_state *pm121_cpu_state;
 463
 464
 465
 466/*
 467 * ***** Implementation *****
 468 *
 469 */
 470
 471/* correction the value using the output-low-bound correction algo */
 472static s32 pm121_correct(s32 new_setpoint,
 473                         unsigned int control_id,
 474                         s32 min)
 475{
 476        s32 new_min;
 477        struct pm121_correction *correction;
 478        correction = &corrections[control_id][pm121_mach_model - 2];
 479
 480        new_min = (average_power * correction->slope) >> 16;
 481        new_min += correction->offset;
 482        new_min = (new_min >> 16) + min;
 483
 484        return max3(new_setpoint, new_min, 0);
 485}
 486
 487static s32 pm121_connect(unsigned int control_id, s32 setpoint)
 488{
 489        s32 new_min, value, new_setpoint;
 490
 491        if (pm121_connection->control_id == control_id) {
 492                controls[control_id]->ops->get_value(controls[control_id],
 493                                                     &value);
 494                new_min = value * pm121_connection->correction.slope;
 495                new_min += pm121_connection->correction.offset;
 496                if (new_min > 0) {
 497                        new_setpoint = max(setpoint, (new_min >> 16));
 498                        if (new_setpoint != setpoint) {
 499                                pr_debug("pm121: %s depending on %s, "
 500                                         "corrected from %d to %d RPM\n",
 501                                         controls[control_id]->name,
 502                                         controls[pm121_connection->ref_id]->name,
 503                                         (int) setpoint, (int) new_setpoint);
 504                        }
 505                } else
 506                        new_setpoint = setpoint;
 507        }
 508        /* no connection */
 509        else
 510                new_setpoint = setpoint;
 511
 512        return new_setpoint;
 513}
 514
 515/* FAN LOOPS */
 516static void pm121_create_sys_fans(int loop_id)
 517{
 518        struct pm121_sys_param *param = NULL;
 519        struct wf_pid_param pid_param;
 520        struct wf_control *control = NULL;
 521        int i;
 522
 523        /* First, locate the params for this model */
 524        for (i = 0; i < PM121_NUM_CONFIGS; i++) {
 525                if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) {
 526                        param = &(pm121_sys_all_params[loop_id][i]);
 527                        break;
 528                }
 529        }
 530
 531        /* No params found, put fans to max */
 532        if (param == NULL) {
 533                printk(KERN_WARNING "pm121: %s fan config not found "
 534                       " for this machine model\n",
 535                       loop_names[loop_id]);
 536                goto fail;
 537        }
 538
 539        control = controls[param->control_id];
 540
 541        /* Alloc & initialize state */
 542        pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state),
 543                                           GFP_KERNEL);
 544        if (pm121_sys_state[loop_id] == NULL) {
 545                printk(KERN_WARNING "pm121: Memory allocation error\n");
 546                goto fail;
 547        }
 548        pm121_sys_state[loop_id]->ticks = 1;
 549
 550        /* Fill PID params */
 551        pid_param.gd            = PM121_SYS_GD;
 552        pid_param.gp            = param->gp;
 553        pid_param.gr            = PM121_SYS_GR;
 554        pid_param.interval      = PM121_SYS_INTERVAL;
 555        pid_param.history_len   = PM121_SYS_HISTORY_SIZE;
 556        pid_param.itarget       = param->itarget;
 557        pid_param.min           = control->ops->get_min(control);
 558        pid_param.max           = control->ops->get_max(control);
 559
 560        wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param);
 561
 562        pr_debug("pm121: %s Fan control loop initialized.\n"
 563                 "       itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 564                 loop_names[loop_id], FIX32TOPRINT(pid_param.itarget),
 565                 pid_param.min, pid_param.max);
 566        return;
 567
 568 fail:
 569        /* note that this is not optimal since another loop may still
 570           control the same control */
 571        printk(KERN_WARNING "pm121: failed to set up %s loop "
 572               "setting \"%s\" to max speed.\n",
 573               loop_names[loop_id], control->name);
 574
 575        if (control)
 576                wf_control_set_max(control);
 577}
 578
 579static void pm121_sys_fans_tick(int loop_id)
 580{
 581        struct pm121_sys_param *param;
 582        struct pm121_sys_state *st;
 583        struct wf_sensor *sensor;
 584        struct wf_control *control;
 585        s32 temp, new_setpoint;
 586        int rc;
 587
 588        param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]);
 589        st = pm121_sys_state[loop_id];
 590        sensor = *(param->sensor);
 591        control = controls[param->control_id];
 592
 593        if (--st->ticks != 0) {
 594                if (pm121_readjust)
 595                        goto readjust;
 596                return;
 597        }
 598        st->ticks = PM121_SYS_INTERVAL;
 599
 600        rc = sensor->ops->get_value(sensor, &temp);
 601        if (rc) {
 602                printk(KERN_WARNING "windfarm: %s sensor error %d\n",
 603                       sensor->name, rc);
 604                pm121_failure_state |= FAILURE_SENSOR;
 605                return;
 606        }
 607
 608        pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n",
 609                 loop_names[loop_id], sensor->name,
 610                 FIX32TOPRINT(temp));
 611
 612        new_setpoint = wf_pid_run(&st->pid, temp);
 613
 614        /* correction */
 615        new_setpoint = pm121_correct(new_setpoint,
 616                                     param->control_id,
 617                                     st->pid.param.min);
 618        /* linked corretion */
 619        new_setpoint = pm121_connect(param->control_id, new_setpoint);
 620
 621        if (new_setpoint == st->setpoint)
 622                return;
 623        st->setpoint = new_setpoint;
 624        pr_debug("pm121: %s corrected setpoint: %d RPM\n",
 625                 control->name, (int)new_setpoint);
 626 readjust:
 627        if (control && pm121_failure_state == 0) {
 628                rc = control->ops->set_value(control, st->setpoint);
 629                if (rc) {
 630                        printk(KERN_WARNING "windfarm: %s fan error %d\n",
 631                               control->name, rc);
 632                        pm121_failure_state |= FAILURE_FAN;
 633                }
 634        }
 635}
 636
 637
 638/* CPU LOOP */
 639static void pm121_create_cpu_fans(void)
 640{
 641        struct wf_cpu_pid_param pid_param;
 642        const struct smu_sdbp_header *hdr;
 643        struct smu_sdbp_cpupiddata *piddata;
 644        struct smu_sdbp_fvt *fvt;
 645        struct wf_control *fan_cpu;
 646        s32 tmax, tdelta, maxpow, powadj;
 647
 648        fan_cpu = controls[FAN_CPU];
 649
 650        /* First, locate the PID params in SMU SBD */
 651        hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
 652        if (hdr == 0) {
 653                printk(KERN_WARNING "pm121: CPU PID fan config not found.\n");
 654                goto fail;
 655        }
 656        piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
 657
 658        /* Get the FVT params for operating point 0 (the only supported one
 659         * for now) in order to get tmax
 660         */
 661        hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
 662        if (hdr) {
 663                fvt = (struct smu_sdbp_fvt *)&hdr[1];
 664                tmax = ((s32)fvt->maxtemp) << 16;
 665        } else
 666                tmax = 0x5e0000; /* 94 degree default */
 667
 668        /* Alloc & initialize state */
 669        pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state),
 670                                  GFP_KERNEL);
 671        if (pm121_cpu_state == NULL)
 672                goto fail;
 673        pm121_cpu_state->ticks = 1;
 674
 675        /* Fill PID params */
 676        pid_param.interval = PM121_CPU_INTERVAL;
 677        pid_param.history_len = piddata->history_len;
 678        if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
 679                printk(KERN_WARNING "pm121: History size overflow on "
 680                       "CPU control loop (%d)\n", piddata->history_len);
 681                pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
 682        }
 683        pid_param.gd = piddata->gd;
 684        pid_param.gp = piddata->gp;
 685        pid_param.gr = piddata->gr / pid_param.history_len;
 686
 687        tdelta = ((s32)piddata->target_temp_delta) << 16;
 688        maxpow = ((s32)piddata->max_power) << 16;
 689        powadj = ((s32)piddata->power_adj) << 16;
 690
 691        pid_param.tmax = tmax;
 692        pid_param.ttarget = tmax - tdelta;
 693        pid_param.pmaxadj = maxpow - powadj;
 694
 695        pid_param.min = fan_cpu->ops->get_min(fan_cpu);
 696        pid_param.max = fan_cpu->ops->get_max(fan_cpu);
 697
 698        wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param);
 699
 700        pr_debug("pm121: CPU Fan control initialized.\n");
 701        pr_debug("       ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n",
 702                 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
 703                 pid_param.min, pid_param.max);
 704
 705        return;
 706
 707 fail:
 708        printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n");
 709
 710        if (controls[CPUFREQ])
 711                wf_control_set_max(controls[CPUFREQ]);
 712        if (fan_cpu)
 713                wf_control_set_max(fan_cpu);
 714}
 715
 716
 717static void pm121_cpu_fans_tick(struct pm121_cpu_state *st)
 718{
 719        s32 new_setpoint, temp, power;
 720        struct wf_control *fan_cpu = NULL;
 721        int rc;
 722
 723        if (--st->ticks != 0) {
 724                if (pm121_readjust)
 725                        goto readjust;
 726                return;
 727        }
 728        st->ticks = PM121_CPU_INTERVAL;
 729
 730        fan_cpu = controls[FAN_CPU];
 731
 732        rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
 733        if (rc) {
 734                printk(KERN_WARNING "pm121: CPU temp sensor error %d\n",
 735                       rc);
 736                pm121_failure_state |= FAILURE_SENSOR;
 737                return;
 738        }
 739
 740        rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
 741        if (rc) {
 742                printk(KERN_WARNING "pm121: CPU power sensor error %d\n",
 743                       rc);
 744                pm121_failure_state |= FAILURE_SENSOR;
 745                return;
 746        }
 747
 748        pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n",
 749                 FIX32TOPRINT(temp), FIX32TOPRINT(power));
 750
 751        if (temp > st->pid.param.tmax)
 752                pm121_failure_state |= FAILURE_OVERTEMP;
 753
 754        new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
 755
 756        /* correction */
 757        new_setpoint = pm121_correct(new_setpoint,
 758                                     FAN_CPU,
 759                                     st->pid.param.min);
 760
 761        /* connected correction */
 762        new_setpoint = pm121_connect(FAN_CPU, new_setpoint);
 763
 764        if (st->setpoint == new_setpoint)
 765                return;
 766        st->setpoint = new_setpoint;
 767        pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint);
 768
 769 readjust:
 770        if (fan_cpu && pm121_failure_state == 0) {
 771                rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint);
 772                if (rc) {
 773                        printk(KERN_WARNING "pm121: %s fan error %d\n",
 774                               fan_cpu->name, rc);
 775                        pm121_failure_state |= FAILURE_FAN;
 776                }
 777        }
 778}
 779
 780/*
 781 * ****** Common ******
 782 *
 783 */
 784
 785static void pm121_tick(void)
 786{
 787        unsigned int last_failure = pm121_failure_state;
 788        unsigned int new_failure;
 789        s32 total_power;
 790        int i;
 791
 792        if (!pm121_started) {
 793                pr_debug("pm121: creating control loops !\n");
 794                for (i = 0; i < N_LOOPS; i++)
 795                        pm121_create_sys_fans(i);
 796
 797                pm121_create_cpu_fans();
 798                pm121_started = 1;
 799        }
 800
 801        /* skipping ticks */
 802        if (pm121_skipping && --pm121_skipping)
 803                return;
 804
 805        /* compute average power */
 806        total_power = 0;
 807        for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++)
 808                total_power += pm121_cpu_state->pid.powers[i];
 809
 810        average_power = total_power / pm121_cpu_state->pid.param.history_len;
 811
 812
 813        pm121_failure_state = 0;
 814        for (i = 0 ; i < N_LOOPS; i++) {
 815                if (pm121_sys_state[i])
 816                        pm121_sys_fans_tick(i);
 817        }
 818
 819        if (pm121_cpu_state)
 820                pm121_cpu_fans_tick(pm121_cpu_state);
 821
 822        pm121_readjust = 0;
 823        new_failure = pm121_failure_state & ~last_failure;
 824
 825        /* If entering failure mode, clamp cpufreq and ramp all
 826         * fans to full speed.
 827         */
 828        if (pm121_failure_state && !last_failure) {
 829                for (i = 0; i < N_CONTROLS; i++) {
 830                        if (controls[i])
 831                                wf_control_set_max(controls[i]);
 832                }
 833        }
 834
 835        /* If leaving failure mode, unclamp cpufreq and readjust
 836         * all fans on next iteration
 837         */
 838        if (!pm121_failure_state && last_failure) {
 839                if (controls[CPUFREQ])
 840                        wf_control_set_min(controls[CPUFREQ]);
 841                pm121_readjust = 1;
 842        }
 843
 844        /* Overtemp condition detected, notify and start skipping a couple
 845         * ticks to let the temperature go down
 846         */
 847        if (new_failure & FAILURE_OVERTEMP) {
 848                wf_set_overtemp();
 849                pm121_skipping = 2;
 850        }
 851
 852        /* We only clear the overtemp condition if overtemp is cleared
 853         * _and_ no other failure is present. Since a sensor error will
 854         * clear the overtemp condition (can't measure temperature) at
 855         * the control loop levels, but we don't want to keep it clear
 856         * here in this case
 857         */
 858        if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
 859                wf_clear_overtemp();
 860}
 861
 862
 863static struct wf_control* pm121_register_control(struct wf_control *ct,
 864                                                 const char *match,
 865                                                 unsigned int id)
 866{
 867        if (controls[id] == NULL && !strcmp(ct->name, match)) {
 868                if (wf_get_control(ct) == 0)
 869                        controls[id] = ct;
 870        }
 871        return controls[id];
 872}
 873
 874static void pm121_new_control(struct wf_control *ct)
 875{
 876        int all = 1;
 877
 878        if (pm121_all_controls_ok)
 879                return;
 880
 881        all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all;
 882        all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all;
 883        all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all;
 884        all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all;
 885
 886        if (all)
 887                pm121_all_controls_ok = 1;
 888}
 889
 890
 891
 892
 893static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor,
 894                                               const char *match,
 895                                               struct wf_sensor **var)
 896{
 897        if (*var == NULL && !strcmp(sensor->name, match)) {
 898                if (wf_get_sensor(sensor) == 0)
 899                        *var = sensor;
 900        }
 901        return *var;
 902}
 903
 904static void pm121_new_sensor(struct wf_sensor *sr)
 905{
 906        int all = 1;
 907
 908        if (pm121_all_sensors_ok)
 909                return;
 910
 911        all = pm121_register_sensor(sr, "cpu-temp",
 912                                    &sensor_cpu_temp) && all;
 913        all = pm121_register_sensor(sr, "cpu-current",
 914                                    &sensor_cpu_current) && all;
 915        all = pm121_register_sensor(sr, "cpu-voltage",
 916                                    &sensor_cpu_voltage) && all;
 917        all = pm121_register_sensor(sr, "cpu-power",
 918                                    &sensor_cpu_power) && all;
 919        all = pm121_register_sensor(sr, "hard-drive-temp",
 920                                    &sensor_hard_drive_temp) && all;
 921        all = pm121_register_sensor(sr, "optical-drive-temp",
 922                                    &sensor_optical_drive_temp) && all;
 923        all = pm121_register_sensor(sr, "incoming-air-temp",
 924                                    &sensor_incoming_air_temp) && all;
 925        all = pm121_register_sensor(sr, "north-bridge-temp",
 926                                    &sensor_north_bridge_temp) && all;
 927        all = pm121_register_sensor(sr, "gpu-temp",
 928                                    &sensor_gpu_temp) && all;
 929
 930        if (all)
 931                pm121_all_sensors_ok = 1;
 932}
 933
 934
 935
 936static int pm121_notify(struct notifier_block *self,
 937                        unsigned long event, void *data)
 938{
 939        switch (event) {
 940        case WF_EVENT_NEW_CONTROL:
 941                pr_debug("pm121: new control %s detected\n",
 942                         ((struct wf_control *)data)->name);
 943                pm121_new_control(data);
 944                break;
 945        case WF_EVENT_NEW_SENSOR:
 946                pr_debug("pm121: new sensor %s detected\n",
 947                         ((struct wf_sensor *)data)->name);
 948                pm121_new_sensor(data);
 949                break;
 950        case WF_EVENT_TICK:
 951                if (pm121_all_controls_ok && pm121_all_sensors_ok)
 952                        pm121_tick();
 953                break;
 954        }
 955
 956        return 0;
 957}
 958
 959static struct notifier_block pm121_events = {
 960        .notifier_call  = pm121_notify,
 961};
 962
 963static int pm121_init_pm(void)
 964{
 965        const struct smu_sdbp_header *hdr;
 966
 967        hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
 968        if (hdr != 0) {
 969                struct smu_sdbp_sensortree *st =
 970                        (struct smu_sdbp_sensortree *)&hdr[1];
 971                pm121_mach_model = st->model_id;
 972        }
 973
 974        pm121_connection = &pm121_connections[pm121_mach_model - 2];
 975
 976        printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n",
 977               pm121_mach_model);
 978
 979        return 0;
 980}
 981
 982
 983static int pm121_probe(struct platform_device *ddev)
 984{
 985        wf_register_client(&pm121_events);
 986
 987        return 0;
 988}
 989
 990static int pm121_remove(struct platform_device *ddev)
 991{
 992        wf_unregister_client(&pm121_events);
 993        return 0;
 994}
 995
 996static struct platform_driver pm121_driver = {
 997        .probe = pm121_probe,
 998        .remove = pm121_remove,
 999        .driver = {
1000                .name = "windfarm",
1001                .bus = &platform_bus_type,
1002        },
1003};
1004
1005
1006static int __init pm121_init(void)
1007{
1008        int rc = -ENODEV;
1009
1010        if (of_machine_is_compatible("PowerMac12,1"))
1011                rc = pm121_init_pm();
1012
1013        if (rc == 0) {
1014                request_module("windfarm_smu_controls");
1015                request_module("windfarm_smu_sensors");
1016                request_module("windfarm_smu_sat");
1017                request_module("windfarm_lm75_sensor");
1018                request_module("windfarm_max6690_sensor");
1019                request_module("windfarm_cpufreq_clamp");
1020                platform_driver_register(&pm121_driver);
1021        }
1022
1023        return rc;
1024}
1025
1026static void __exit pm121_exit(void)
1027{
1028
1029        platform_driver_unregister(&pm121_driver);
1030}
1031
1032
1033module_init(pm121_init);
1034module_exit(pm121_exit);
1035
1036MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>");
1037MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");
1038MODULE_LICENSE("GPL");
1039
1040
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