linux/drivers/macintosh/windfarm_pm121.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Windfarm PowerMac thermal control. iMac G5 iSight
   4 *
   5 * (c) Copyright 2007 Étienne Bersac <bersace@gmail.com>
   6 *
   7 * Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin
   8 * Herrenschmidt, IBM Corp. <benh@kernel.crashing.org>
   9 *
  10 * PowerMac12,1
  11 * ============
  12 *
  13 * The algorithm used is the PID control algorithm, used the same way
  14 * the published Darwin code does, using the same values that are
  15 * present in the Darwin 8.10 snapshot property lists (note however
  16 * that none of the code has been re-used, it's a complete
  17 * re-implementation
  18 *
  19 * There is two models using PowerMac12,1. Model 2 is iMac G5 iSight
  20 * 17" while Model 3 is iMac G5 20". They do have both the same
  21 * controls with a tiny difference. The control-ids of hard-drive-fan
  22 * and cpu-fan is swapped.
  23 *
  24 * Target Correction :
  25 *
  26 * controls have a target correction calculated as :
  27 *
  28 * new_min = ((((average_power * slope) >> 16) + offset) >> 16) + min_value
  29 * new_value = max(new_value, max(new_min, 0))
  30 *
  31 * OD Fan control correction.
  32 *
  33 * # model_id: 2
  34 *   offset             : -19563152
  35 *   slope              :  1956315
  36 *
  37 * # model_id: 3
  38 *   offset             : -15650652
  39 *   slope              :  1565065
  40 *
  41 * HD Fan control correction.
  42 *
  43 * # model_id: 2
  44 *   offset             : -15650652
  45 *   slope              :  1565065
  46 *
  47 * # model_id: 3
  48 *   offset             : -19563152
  49 *   slope              :  1956315
  50 *
  51 * CPU Fan control correction.
  52 *
  53 * # model_id: 2
  54 *   offset             : -25431900
  55 *   slope              :  2543190
  56 *
  57 * # model_id: 3
  58 *   offset             : -15650652
  59 *   slope              :  1565065
  60 *
  61 * Target rubber-banding :
  62 *
  63 * Some controls have a target correction which depends on another
  64 * control value. The correction is computed in the following way :
  65 *
  66 * new_min = ref_value * slope + offset
  67 *
  68 * ref_value is the value of the reference control. If new_min is
  69 * greater than 0, then we correct the target value using :
  70 *
  71 * new_target = max (new_target, new_min >> 16)
  72 *
  73 * # model_id : 2
  74 *   control    : cpu-fan
  75 *   ref        : optical-drive-fan
  76 *   offset     : -15650652
  77 *   slope      : 1565065
  78 *
  79 * # model_id : 3
  80 *   control    : optical-drive-fan
  81 *   ref        : hard-drive-fan
  82 *   offset     : -32768000
  83 *   slope      : 65536
  84 *
  85 * In order to have the moste efficient correction with those
  86 * dependencies, we must trigger HD loop before OD loop before CPU
  87 * loop.
  88 *
  89 * The various control loops found in Darwin config file are:
  90 *
  91 * HD Fan control loop.
  92 *
  93 * # model_id: 2
  94 *   control        : hard-drive-fan
  95 *   sensor         : hard-drive-temp
  96 *   PID params     : G_d = 0x00000000
  97 *                    G_p = 0x002D70A3
  98 *                    G_r = 0x00019999
  99 *                    History = 2 entries
 100 *                    Input target = 0x370000
 101 *                    Interval = 5s
 102 *
 103 * # model_id: 3
 104 *   control        : hard-drive-fan
 105 *   sensor         : hard-drive-temp
 106 *   PID params     : G_d = 0x00000000
 107 *                    G_p = 0x002170A3
 108 *                    G_r = 0x00019999
 109 *                    History = 2 entries
 110 *                    Input target = 0x370000
 111 *                    Interval = 5s
 112 *
 113 * OD Fan control loop.
 114 *
 115 * # model_id: 2
 116 *   control        : optical-drive-fan
 117 *   sensor         : optical-drive-temp
 118 *   PID params     : G_d = 0x00000000
 119 *                    G_p = 0x001FAE14
 120 *                    G_r = 0x00019999
 121 *                    History = 2 entries
 122 *                    Input target = 0x320000
 123 *                    Interval = 5s
 124 *
 125 * # model_id: 3
 126 *   control        : optical-drive-fan
 127 *   sensor         : optical-drive-temp
 128 *   PID params     : G_d = 0x00000000
 129 *                    G_p = 0x001FAE14
 130 *                    G_r = 0x00019999
 131 *                    History = 2 entries
 132 *                    Input target = 0x320000
 133 *                    Interval = 5s
 134 *
 135 * GPU Fan control loop.
 136 *
 137 * # model_id: 2
 138 *   control        : hard-drive-fan
 139 *   sensor         : gpu-temp
 140 *   PID params     : G_d = 0x00000000
 141 *                    G_p = 0x002A6666
 142 *                    G_r = 0x00019999
 143 *                    History = 2 entries
 144 *                    Input target = 0x5A0000
 145 *                    Interval = 5s
 146 *
 147 * # model_id: 3
 148 *   control        : cpu-fan
 149 *   sensor         : gpu-temp
 150 *   PID params     : G_d = 0x00000000
 151 *                    G_p = 0x0010CCCC
 152 *                    G_r = 0x00019999
 153 *                    History = 2 entries
 154 *                    Input target = 0x500000
 155 *                    Interval = 5s
 156 *
 157 * KODIAK (aka northbridge) Fan control loop.
 158 *
 159 * # model_id: 2
 160 *   control        : optical-drive-fan
 161 *   sensor         : north-bridge-temp
 162 *   PID params     : G_d = 0x00000000
 163 *                    G_p = 0x003BD70A
 164 *                    G_r = 0x00019999
 165 *                    History = 2 entries
 166 *                    Input target = 0x550000
 167 *                    Interval = 5s
 168 *
 169 * # model_id: 3
 170 *   control        : hard-drive-fan
 171 *   sensor         : north-bridge-temp
 172 *   PID params     : G_d = 0x00000000
 173 *                    G_p = 0x0030F5C2
 174 *                    G_r = 0x00019999
 175 *                    History = 2 entries
 176 *                    Input target = 0x550000
 177 *                    Interval = 5s
 178 *
 179 * CPU Fan control loop.
 180 *
 181 *   control        : cpu-fan
 182 *   sensors        : cpu-temp, cpu-power
 183 *   PID params     : from SDB partition
 184 *
 185 * CPU Slew control loop.
 186 *
 187 *   control        : cpufreq-clamp
 188 *   sensor         : cpu-temp
 189 */
 190
 191#undef  DEBUG
 192
 193#include <linux/types.h>
 194#include <linux/errno.h>
 195#include <linux/kernel.h>
 196#include <linux/delay.h>
 197#include <linux/slab.h>
 198#include <linux/init.h>
 199#include <linux/spinlock.h>
 200#include <linux/wait.h>
 201#include <linux/kmod.h>
 202#include <linux/device.h>
 203#include <linux/platform_device.h>
 204#include <asm/prom.h>
 205#include <asm/machdep.h>
 206#include <asm/io.h>
 207#include <asm/sections.h>
 208#include <asm/smu.h>
 209
 210#include "windfarm.h"
 211#include "windfarm_pid.h"
 212
 213#define VERSION "0.3"
 214
 215static int pm121_mach_model;    /* machine model id */
 216
 217/* Controls & sensors */
 218static struct wf_sensor *sensor_cpu_power;
 219static struct wf_sensor *sensor_cpu_temp;
 220static struct wf_sensor *sensor_cpu_voltage;
 221static struct wf_sensor *sensor_cpu_current;
 222static struct wf_sensor *sensor_gpu_temp;
 223static struct wf_sensor *sensor_north_bridge_temp;
 224static struct wf_sensor *sensor_hard_drive_temp;
 225static struct wf_sensor *sensor_optical_drive_temp;
 226static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */
 227
 228enum {
 229        FAN_CPU,
 230        FAN_HD,
 231        FAN_OD,
 232        CPUFREQ,
 233        N_CONTROLS
 234};
 235static struct wf_control *controls[N_CONTROLS] = {};
 236
 237/* Set to kick the control loop into life */
 238static int pm121_all_controls_ok, pm121_all_sensors_ok;
 239static bool pm121_started;
 240
 241enum {
 242        FAILURE_FAN             = 1 << 0,
 243        FAILURE_SENSOR          = 1 << 1,
 244        FAILURE_OVERTEMP        = 1 << 2
 245};
 246
 247/* All sys loops. Note the HD before the OD loop in order to have it
 248   run before. */
 249enum {
 250        LOOP_GPU,               /* control = hd or cpu, but luckily,
 251                                   it doesn't matter */
 252        LOOP_HD,                /* control = hd */
 253        LOOP_KODIAK,            /* control = hd or od */
 254        LOOP_OD,                /* control = od */
 255        N_LOOPS
 256};
 257
 258static const char *loop_names[N_LOOPS] = {
 259        "GPU",
 260        "HD",
 261        "KODIAK",
 262        "OD",
 263};
 264
 265#define PM121_NUM_CONFIGS       2
 266
 267static unsigned int pm121_failure_state;
 268static int pm121_readjust, pm121_skipping;
 269static bool pm121_overtemp;
 270static s32 average_power;
 271
 272struct pm121_correction {
 273        int     offset;
 274        int     slope;
 275};
 276
 277static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = {
 278        /* FAN_OD */
 279        {
 280                /* MODEL 2 */
 281                { .offset       = -19563152,
 282                  .slope        =  1956315
 283                },
 284                /* MODEL 3 */
 285                { .offset       = -15650652,
 286                  .slope        =  1565065
 287                },
 288        },
 289        /* FAN_HD */
 290        {
 291                /* MODEL 2 */
 292                { .offset       = -15650652,
 293                  .slope        =  1565065
 294                },
 295                /* MODEL 3 */
 296                { .offset       = -19563152,
 297                  .slope        =  1956315
 298                },
 299        },
 300        /* FAN_CPU */
 301        {
 302                /* MODEL 2 */
 303                { .offset       = -25431900,
 304                  .slope        =  2543190
 305                },
 306                /* MODEL 3 */
 307                { .offset       = -15650652,
 308                  .slope        =  1565065
 309                },
 310        },
 311        /* CPUFREQ has no correction (and is not implemented at all) */
 312};
 313
 314struct pm121_connection {
 315        unsigned int    control_id;
 316        unsigned int    ref_id;
 317        struct pm121_correction correction;
 318};
 319
 320static struct pm121_connection pm121_connections[] = {
 321        /* MODEL 2 */
 322        { .control_id   = FAN_CPU,
 323          .ref_id       = FAN_OD,
 324          { .offset     = -32768000,
 325            .slope      =  65536
 326          }
 327        },
 328        /* MODEL 3 */
 329        { .control_id   = FAN_OD,
 330          .ref_id       = FAN_HD,
 331          { .offset     = -32768000,
 332            .slope      =  65536
 333          }
 334        },
 335};
 336
 337/* pointer to the current model connection */
 338static struct pm121_connection *pm121_connection;
 339
 340/*
 341 * ****** System Fans Control Loop ******
 342 *
 343 */
 344
 345/* Since each loop handles only one control and we want to avoid
 346 * writing virtual control, we store the control correction with the
 347 * loop params. Some data are not set, there are common to all loop
 348 * and thus, hardcoded.
 349 */
 350struct pm121_sys_param {
 351        /* purely informative since we use mach_model-2 as index */
 352        int                     model_id;
 353        struct wf_sensor        **sensor; /* use sensor_id instead ? */
 354        s32                     gp, itarget;
 355        unsigned int            control_id;
 356};
 357
 358static struct pm121_sys_param
 359pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = {
 360        /* GPU Fan control loop */
 361        {
 362                { .model_id     = 2,
 363                  .sensor       = &sensor_gpu_temp,
 364                  .gp           = 0x002A6666,
 365                  .itarget      = 0x5A0000,
 366                  .control_id   = FAN_HD,
 367                },
 368                { .model_id     = 3,
 369                  .sensor       = &sensor_gpu_temp,
 370                  .gp           = 0x0010CCCC,
 371                  .itarget      = 0x500000,
 372                  .control_id   = FAN_CPU,
 373                },
 374        },
 375        /* HD Fan control loop */
 376        {
 377                { .model_id     = 2,
 378                  .sensor       = &sensor_hard_drive_temp,
 379                  .gp           = 0x002D70A3,
 380                  .itarget      = 0x370000,
 381                  .control_id   = FAN_HD,
 382                },
 383                { .model_id     = 3,
 384                  .sensor       = &sensor_hard_drive_temp,
 385                  .gp           = 0x002170A3,
 386                  .itarget      = 0x370000,
 387                  .control_id   = FAN_HD,
 388                },
 389        },
 390        /* KODIAK Fan control loop */
 391        {
 392                { .model_id     = 2,
 393                  .sensor       = &sensor_north_bridge_temp,
 394                  .gp           = 0x003BD70A,
 395                  .itarget      = 0x550000,
 396                  .control_id   = FAN_OD,
 397                },
 398                { .model_id     = 3,
 399                  .sensor       = &sensor_north_bridge_temp,
 400                  .gp           = 0x0030F5C2,
 401                  .itarget      = 0x550000,
 402                  .control_id   = FAN_HD,
 403                },
 404        },
 405        /* OD Fan control loop */
 406        {
 407                { .model_id     = 2,
 408                  .sensor       = &sensor_optical_drive_temp,
 409                  .gp           = 0x001FAE14,
 410                  .itarget      = 0x320000,
 411                  .control_id   = FAN_OD,
 412                },
 413                { .model_id     = 3,
 414                  .sensor       = &sensor_optical_drive_temp,
 415                  .gp           = 0x001FAE14,
 416                  .itarget      = 0x320000,
 417                  .control_id   = FAN_OD,
 418                },
 419        },
 420};
 421
 422/* the hardcoded values */
 423#define PM121_SYS_GD            0x00000000
 424#define PM121_SYS_GR            0x00019999
 425#define PM121_SYS_HISTORY_SIZE  2
 426#define PM121_SYS_INTERVAL      5
 427
 428/* State data used by the system fans control loop
 429 */
 430struct pm121_sys_state {
 431        int                     ticks;
 432        s32                     setpoint;
 433        struct wf_pid_state     pid;
 434};
 435
 436static struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {};
 437
 438/*
 439 * ****** CPU Fans Control Loop ******
 440 *
 441 */
 442
 443#define PM121_CPU_INTERVAL      1
 444
 445/* State data used by the cpu fans control loop
 446 */
 447struct pm121_cpu_state {
 448        int                     ticks;
 449        s32                     setpoint;
 450        struct wf_cpu_pid_state pid;
 451};
 452
 453static struct pm121_cpu_state *pm121_cpu_state;
 454
 455
 456
 457/*
 458 * ***** Implementation *****
 459 *
 460 */
 461
 462/* correction the value using the output-low-bound correction algo */
 463static s32 pm121_correct(s32 new_setpoint,
 464                         unsigned int control_id,
 465                         s32 min)
 466{
 467        s32 new_min;
 468        struct pm121_correction *correction;
 469        correction = &corrections[control_id][pm121_mach_model - 2];
 470
 471        new_min = (average_power * correction->slope) >> 16;
 472        new_min += correction->offset;
 473        new_min = (new_min >> 16) + min;
 474
 475        return max3(new_setpoint, new_min, 0);
 476}
 477
 478static s32 pm121_connect(unsigned int control_id, s32 setpoint)
 479{
 480        s32 new_min, value, new_setpoint;
 481
 482        if (pm121_connection->control_id == control_id) {
 483                controls[control_id]->ops->get_value(controls[control_id],
 484                                                     &value);
 485                new_min = value * pm121_connection->correction.slope;
 486                new_min += pm121_connection->correction.offset;
 487                if (new_min > 0) {
 488                        new_setpoint = max(setpoint, (new_min >> 16));
 489                        if (new_setpoint != setpoint) {
 490                                pr_debug("pm121: %s depending on %s, "
 491                                         "corrected from %d to %d RPM\n",
 492                                         controls[control_id]->name,
 493                                         controls[pm121_connection->ref_id]->name,
 494                                         (int) setpoint, (int) new_setpoint);
 495                        }
 496                } else
 497                        new_setpoint = setpoint;
 498        }
 499        /* no connection */
 500        else
 501                new_setpoint = setpoint;
 502
 503        return new_setpoint;
 504}
 505
 506/* FAN LOOPS */
 507static void pm121_create_sys_fans(int loop_id)
 508{
 509        struct pm121_sys_param *param = NULL;
 510        struct wf_pid_param pid_param;
 511        struct wf_control *control = NULL;
 512        int i;
 513
 514        /* First, locate the params for this model */
 515        for (i = 0; i < PM121_NUM_CONFIGS; i++) {
 516                if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) {
 517                        param = &(pm121_sys_all_params[loop_id][i]);
 518                        break;
 519                }
 520        }
 521
 522        /* No params found, put fans to max */
 523        if (param == NULL) {
 524                printk(KERN_WARNING "pm121: %s fan config not found "
 525                       " for this machine model\n",
 526                       loop_names[loop_id]);
 527                goto fail;
 528        }
 529
 530        control = controls[param->control_id];
 531
 532        /* Alloc & initialize state */
 533        pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state),
 534                                           GFP_KERNEL);
 535        if (pm121_sys_state[loop_id] == NULL) {
 536                printk(KERN_WARNING "pm121: Memory allocation error\n");
 537                goto fail;
 538        }
 539        pm121_sys_state[loop_id]->ticks = 1;
 540
 541        /* Fill PID params */
 542        pid_param.gd            = PM121_SYS_GD;
 543        pid_param.gp            = param->gp;
 544        pid_param.gr            = PM121_SYS_GR;
 545        pid_param.interval      = PM121_SYS_INTERVAL;
 546        pid_param.history_len   = PM121_SYS_HISTORY_SIZE;
 547        pid_param.itarget       = param->itarget;
 548        if(control)
 549        {
 550                pid_param.min           = control->ops->get_min(control);
 551                pid_param.max           = control->ops->get_max(control);
 552        } else {
 553                /*
 554                 * This is probably not the right!?
 555                 * Perhaps goto fail  if control == NULL  above?
 556                 */
 557                pid_param.min           = 0;
 558                pid_param.max           = 0;
 559        }
 560
 561        wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param);
 562
 563        pr_debug("pm121: %s Fan control loop initialized.\n"
 564                 "       itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 565                 loop_names[loop_id], FIX32TOPRINT(pid_param.itarget),
 566                 pid_param.min, pid_param.max);
 567        return;
 568
 569 fail:
 570        /* note that this is not optimal since another loop may still
 571           control the same control */
 572        printk(KERN_WARNING "pm121: failed to set up %s loop "
 573               "setting \"%s\" to max speed.\n",
 574               loop_names[loop_id], control ? control->name : "uninitialized value");
 575
 576        if (control)
 577                wf_control_set_max(control);
 578}
 579
 580static void pm121_sys_fans_tick(int loop_id)
 581{
 582        struct pm121_sys_param *param;
 583        struct pm121_sys_state *st;
 584        struct wf_sensor *sensor;
 585        struct wf_control *control;
 586        s32 temp, new_setpoint;
 587        int rc;
 588
 589        param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]);
 590        st = pm121_sys_state[loop_id];
 591        sensor = *(param->sensor);
 592        control = controls[param->control_id];
 593
 594        if (--st->ticks != 0) {
 595                if (pm121_readjust)
 596                        goto readjust;
 597                return;
 598        }
 599        st->ticks = PM121_SYS_INTERVAL;
 600
 601        rc = sensor->ops->get_value(sensor, &temp);
 602        if (rc) {
 603                printk(KERN_WARNING "windfarm: %s sensor error %d\n",
 604                       sensor->name, rc);
 605                pm121_failure_state |= FAILURE_SENSOR;
 606                return;
 607        }
 608
 609        pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n",
 610                 loop_names[loop_id], sensor->name,
 611                 FIX32TOPRINT(temp));
 612
 613        new_setpoint = wf_pid_run(&st->pid, temp);
 614
 615        /* correction */
 616        new_setpoint = pm121_correct(new_setpoint,
 617                                     param->control_id,
 618                                     st->pid.param.min);
 619        /* linked corretion */
 620        new_setpoint = pm121_connect(param->control_id, new_setpoint);
 621
 622        if (new_setpoint == st->setpoint)
 623                return;
 624        st->setpoint = new_setpoint;
 625        pr_debug("pm121: %s corrected setpoint: %d RPM\n",
 626                 control->name, (int)new_setpoint);
 627 readjust:
 628        if (control && pm121_failure_state == 0) {
 629                rc = control->ops->set_value(control, st->setpoint);
 630                if (rc) {
 631                        printk(KERN_WARNING "windfarm: %s fan error %d\n",
 632                               control->name, rc);
 633                        pm121_failure_state |= FAILURE_FAN;
 634                }
 635        }
 636}
 637
 638
 639/* CPU LOOP */
 640static void pm121_create_cpu_fans(void)
 641{
 642        struct wf_cpu_pid_param pid_param;
 643        const struct smu_sdbp_header *hdr;
 644        struct smu_sdbp_cpupiddata *piddata;
 645        struct smu_sdbp_fvt *fvt;
 646        struct wf_control *fan_cpu;
 647        s32 tmax, tdelta, maxpow, powadj;
 648
 649        fan_cpu = controls[FAN_CPU];
 650
 651        /* First, locate the PID params in SMU SBD */
 652        hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
 653        if (hdr == 0) {
 654                printk(KERN_WARNING "pm121: CPU PID fan config not found.\n");
 655                goto fail;
 656        }
 657        piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
 658
 659        /* Get the FVT params for operating point 0 (the only supported one
 660         * for now) in order to get tmax
 661         */
 662        hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
 663        if (hdr) {
 664                fvt = (struct smu_sdbp_fvt *)&hdr[1];
 665                tmax = ((s32)fvt->maxtemp) << 16;
 666        } else
 667                tmax = 0x5e0000; /* 94 degree default */
 668
 669        /* Alloc & initialize state */
 670        pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state),
 671                                  GFP_KERNEL);
 672        if (pm121_cpu_state == NULL)
 673                goto fail;
 674        pm121_cpu_state->ticks = 1;
 675
 676        /* Fill PID params */
 677        pid_param.interval = PM121_CPU_INTERVAL;
 678        pid_param.history_len = piddata->history_len;
 679        if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
 680                printk(KERN_WARNING "pm121: History size overflow on "
 681                       "CPU control loop (%d)\n", piddata->history_len);
 682                pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
 683        }
 684        pid_param.gd = piddata->gd;
 685        pid_param.gp = piddata->gp;
 686        pid_param.gr = piddata->gr / pid_param.history_len;
 687
 688        tdelta = ((s32)piddata->target_temp_delta) << 16;
 689        maxpow = ((s32)piddata->max_power) << 16;
 690        powadj = ((s32)piddata->power_adj) << 16;
 691
 692        pid_param.tmax = tmax;
 693        pid_param.ttarget = tmax - tdelta;
 694        pid_param.pmaxadj = maxpow - powadj;
 695
 696        pid_param.min = fan_cpu->ops->get_min(fan_cpu);
 697        pid_param.max = fan_cpu->ops->get_max(fan_cpu);
 698
 699        wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param);
 700
 701        pr_debug("pm121: CPU Fan control initialized.\n");
 702        pr_debug("       ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n",
 703                 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
 704                 pid_param.min, pid_param.max);
 705
 706        return;
 707
 708 fail:
 709        printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n");
 710
 711        if (controls[CPUFREQ])
 712                wf_control_set_max(controls[CPUFREQ]);
 713        if (fan_cpu)
 714                wf_control_set_max(fan_cpu);
 715}
 716
 717
 718static void pm121_cpu_fans_tick(struct pm121_cpu_state *st)
 719{
 720        s32 new_setpoint, temp, power;
 721        struct wf_control *fan_cpu = NULL;
 722        int rc;
 723
 724        if (--st->ticks != 0) {
 725                if (pm121_readjust)
 726                        goto readjust;
 727                return;
 728        }
 729        st->ticks = PM121_CPU_INTERVAL;
 730
 731        fan_cpu = controls[FAN_CPU];
 732
 733        rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
 734        if (rc) {
 735                printk(KERN_WARNING "pm121: CPU temp sensor error %d\n",
 736                       rc);
 737                pm121_failure_state |= FAILURE_SENSOR;
 738                return;
 739        }
 740
 741        rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
 742        if (rc) {
 743                printk(KERN_WARNING "pm121: CPU power sensor error %d\n",
 744                       rc);
 745                pm121_failure_state |= FAILURE_SENSOR;
 746                return;
 747        }
 748
 749        pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n",
 750                 FIX32TOPRINT(temp), FIX32TOPRINT(power));
 751
 752        if (temp > st->pid.param.tmax)
 753                pm121_failure_state |= FAILURE_OVERTEMP;
 754
 755        new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
 756
 757        /* correction */
 758        new_setpoint = pm121_correct(new_setpoint,
 759                                     FAN_CPU,
 760                                     st->pid.param.min);
 761
 762        /* connected correction */
 763        new_setpoint = pm121_connect(FAN_CPU, new_setpoint);
 764
 765        if (st->setpoint == new_setpoint)
 766                return;
 767        st->setpoint = new_setpoint;
 768        pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint);
 769
 770 readjust:
 771        if (fan_cpu && pm121_failure_state == 0) {
 772                rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint);
 773                if (rc) {
 774                        printk(KERN_WARNING "pm121: %s fan error %d\n",
 775                               fan_cpu->name, rc);
 776                        pm121_failure_state |= FAILURE_FAN;
 777                }
 778        }
 779}
 780
 781/*
 782 * ****** Common ******
 783 *
 784 */
 785
 786static void pm121_tick(void)
 787{
 788        unsigned int last_failure = pm121_failure_state;
 789        unsigned int new_failure;
 790        s32 total_power;
 791        int i;
 792
 793        if (!pm121_started) {
 794                pr_debug("pm121: creating control loops !\n");
 795                for (i = 0; i < N_LOOPS; i++)
 796                        pm121_create_sys_fans(i);
 797
 798                pm121_create_cpu_fans();
 799                pm121_started = true;
 800        }
 801
 802        /* skipping ticks */
 803        if (pm121_skipping && --pm121_skipping)
 804                return;
 805
 806        /* compute average power */
 807        total_power = 0;
 808        for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++)
 809                total_power += pm121_cpu_state->pid.powers[i];
 810
 811        average_power = total_power / pm121_cpu_state->pid.param.history_len;
 812
 813
 814        pm121_failure_state = 0;
 815        for (i = 0 ; i < N_LOOPS; i++) {
 816                if (pm121_sys_state[i])
 817                        pm121_sys_fans_tick(i);
 818        }
 819
 820        if (pm121_cpu_state)
 821                pm121_cpu_fans_tick(pm121_cpu_state);
 822
 823        pm121_readjust = 0;
 824        new_failure = pm121_failure_state & ~last_failure;
 825
 826        /* If entering failure mode, clamp cpufreq and ramp all
 827         * fans to full speed.
 828         */
 829        if (pm121_failure_state && !last_failure) {
 830                for (i = 0; i < N_CONTROLS; i++) {
 831                        if (controls[i])
 832                                wf_control_set_max(controls[i]);
 833                }
 834        }
 835
 836        /* If leaving failure mode, unclamp cpufreq and readjust
 837         * all fans on next iteration
 838         */
 839        if (!pm121_failure_state && last_failure) {
 840                if (controls[CPUFREQ])
 841                        wf_control_set_min(controls[CPUFREQ]);
 842                pm121_readjust = 1;
 843        }
 844
 845        /* Overtemp condition detected, notify and start skipping a couple
 846         * ticks to let the temperature go down
 847         */
 848        if (new_failure & FAILURE_OVERTEMP) {
 849                wf_set_overtemp();
 850                pm121_skipping = 2;
 851                pm121_overtemp = true;
 852        }
 853
 854        /* We only clear the overtemp condition if overtemp is cleared
 855         * _and_ no other failure is present. Since a sensor error will
 856         * clear the overtemp condition (can't measure temperature) at
 857         * the control loop levels, but we don't want to keep it clear
 858         * here in this case
 859         */
 860        if (!pm121_failure_state && pm121_overtemp) {
 861                wf_clear_overtemp();
 862                pm121_overtemp = false;
 863        }
 864}
 865
 866
 867static struct wf_control* pm121_register_control(struct wf_control *ct,
 868                                                 const char *match,
 869                                                 unsigned int id)
 870{
 871        if (controls[id] == NULL && !strcmp(ct->name, match)) {
 872                if (wf_get_control(ct) == 0)
 873                        controls[id] = ct;
 874        }
 875        return controls[id];
 876}
 877
 878static void pm121_new_control(struct wf_control *ct)
 879{
 880        int all = 1;
 881
 882        if (pm121_all_controls_ok)
 883                return;
 884
 885        all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all;
 886        all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all;
 887        all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all;
 888        all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all;
 889
 890        if (all)
 891                pm121_all_controls_ok = 1;
 892}
 893
 894
 895
 896
 897static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor,
 898                                               const char *match,
 899                                               struct wf_sensor **var)
 900{
 901        if (*var == NULL && !strcmp(sensor->name, match)) {
 902                if (wf_get_sensor(sensor) == 0)
 903                        *var = sensor;
 904        }
 905        return *var;
 906}
 907
 908static void pm121_new_sensor(struct wf_sensor *sr)
 909{
 910        int all = 1;
 911
 912        if (pm121_all_sensors_ok)
 913                return;
 914
 915        all = pm121_register_sensor(sr, "cpu-temp",
 916                                    &sensor_cpu_temp) && all;
 917        all = pm121_register_sensor(sr, "cpu-current",
 918                                    &sensor_cpu_current) && all;
 919        all = pm121_register_sensor(sr, "cpu-voltage",
 920                                    &sensor_cpu_voltage) && all;
 921        all = pm121_register_sensor(sr, "cpu-power",
 922                                    &sensor_cpu_power) && all;
 923        all = pm121_register_sensor(sr, "hard-drive-temp",
 924                                    &sensor_hard_drive_temp) && all;
 925        all = pm121_register_sensor(sr, "optical-drive-temp",
 926                                    &sensor_optical_drive_temp) && all;
 927        all = pm121_register_sensor(sr, "incoming-air-temp",
 928                                    &sensor_incoming_air_temp) && all;
 929        all = pm121_register_sensor(sr, "north-bridge-temp",
 930                                    &sensor_north_bridge_temp) && all;
 931        all = pm121_register_sensor(sr, "gpu-temp",
 932                                    &sensor_gpu_temp) && all;
 933
 934        if (all)
 935                pm121_all_sensors_ok = 1;
 936}
 937
 938
 939
 940static int pm121_notify(struct notifier_block *self,
 941                        unsigned long event, void *data)
 942{
 943        switch (event) {
 944        case WF_EVENT_NEW_CONTROL:
 945                pr_debug("pm121: new control %s detected\n",
 946                         ((struct wf_control *)data)->name);
 947                pm121_new_control(data);
 948                break;
 949        case WF_EVENT_NEW_SENSOR:
 950                pr_debug("pm121: new sensor %s detected\n",
 951                         ((struct wf_sensor *)data)->name);
 952                pm121_new_sensor(data);
 953                break;
 954        case WF_EVENT_TICK:
 955                if (pm121_all_controls_ok && pm121_all_sensors_ok)
 956                        pm121_tick();
 957                break;
 958        }
 959
 960        return 0;
 961}
 962
 963static struct notifier_block pm121_events = {
 964        .notifier_call  = pm121_notify,
 965};
 966
 967static int pm121_init_pm(void)
 968{
 969        const struct smu_sdbp_header *hdr;
 970
 971        hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
 972        if (hdr != 0) {
 973                struct smu_sdbp_sensortree *st =
 974                        (struct smu_sdbp_sensortree *)&hdr[1];
 975                pm121_mach_model = st->model_id;
 976        }
 977
 978        pm121_connection = &pm121_connections[pm121_mach_model - 2];
 979
 980        printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n",
 981               pm121_mach_model);
 982
 983        return 0;
 984}
 985
 986
 987static int pm121_probe(struct platform_device *ddev)
 988{
 989        wf_register_client(&pm121_events);
 990
 991        return 0;
 992}
 993
 994static int pm121_remove(struct platform_device *ddev)
 995{
 996        wf_unregister_client(&pm121_events);
 997        return 0;
 998}
 999
1000static struct platform_driver pm121_driver = {
1001        .probe = pm121_probe,
1002        .remove = pm121_remove,
1003        .driver = {
1004                .name = "windfarm",
1005                .bus = &platform_bus_type,
1006        },
1007};
1008
1009
1010static int __init pm121_init(void)
1011{
1012        int rc = -ENODEV;
1013
1014        if (of_machine_is_compatible("PowerMac12,1"))
1015                rc = pm121_init_pm();
1016
1017        if (rc == 0) {
1018                request_module("windfarm_smu_controls");
1019                request_module("windfarm_smu_sensors");
1020                request_module("windfarm_smu_sat");
1021                request_module("windfarm_lm75_sensor");
1022                request_module("windfarm_max6690_sensor");
1023                request_module("windfarm_cpufreq_clamp");
1024                platform_driver_register(&pm121_driver);
1025        }
1026
1027        return rc;
1028}
1029
1030static void __exit pm121_exit(void)
1031{
1032
1033        platform_driver_unregister(&pm121_driver);
1034}
1035
1036
1037module_init(pm121_init);
1038module_exit(pm121_exit);
1039
1040MODULE_AUTHOR("tienne Bersac <bersace@gmail.com>");
1041MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");
1042MODULE_LICENSE("GPL");
1043
1044
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