linux/drivers/macintosh/windfarm_pm81.c
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   1/*
   2 * Windfarm PowerMac thermal control. iMac G5
   3 *
   4 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
   5 *                    <benh@kernel.crashing.org>
   6 *
   7 * Released under the term of the GNU GPL v2.
   8 *
   9 * The algorithm used is the PID control algorithm, used the same
  10 * way the published Darwin code does, using the same values that
  11 * are present in the Darwin 8.2 snapshot property lists (note however
  12 * that none of the code has been re-used, it's a complete re-implementation
  13 *
  14 * The various control loops found in Darwin config file are:
  15 *
  16 * PowerMac8,1 and PowerMac8,2
  17 * ===========================
  18 *
  19 * System Fans control loop. Different based on models. In addition to the
  20 * usual PID algorithm, the control loop gets 2 additional pairs of linear
  21 * scaling factors (scale/offsets) expressed as 4.12 fixed point values
  22 * signed offset, unsigned scale)
  23 *
  24 * The targets are modified such as:
  25 *  - the linked control (second control) gets the target value as-is
  26 *    (typically the drive fan)
  27 *  - the main control (first control) gets the target value scaled with
  28 *    the first pair of factors, and is then modified as below
  29 *  - the value of the target of the CPU Fan control loop is retrieved,
  30 *    scaled with the second pair of factors, and the max of that and
  31 *    the scaled target is applied to the main control.
  32 *
  33 * # model_id: 2
  34 *   controls       : system-fan, drive-bay-fan
  35 *   sensors        : hd-temp
  36 *   PID params     : G_d = 0x15400000
  37 *                    G_p = 0x00200000
  38 *                    G_r = 0x000002fd
  39 *                    History = 2 entries
  40 *                    Input target = 0x3a0000
  41 *                    Interval = 5s
  42 *   linear-factors : offset = 0xff38 scale  = 0x0ccd
  43 *                    offset = 0x0208 scale  = 0x07ae
  44 *
  45 * # model_id: 3
  46 *   controls       : system-fan, drive-bay-fan
  47 *   sensors        : hd-temp
  48 *   PID params     : G_d = 0x08e00000
  49 *                    G_p = 0x00566666
  50 *                    G_r = 0x0000072b
  51 *                    History = 2 entries
  52 *                    Input target = 0x350000
  53 *                    Interval = 5s
  54 *   linear-factors : offset = 0xff38 scale  = 0x0ccd
  55 *                    offset = 0x0000 scale  = 0x0000
  56 *
  57 * # model_id: 5
  58 *   controls       : system-fan
  59 *   sensors        : hd-temp
  60 *   PID params     : G_d = 0x15400000
  61 *                    G_p = 0x00233333
  62 *                    G_r = 0x000002fd
  63 *                    History = 2 entries
  64 *                    Input target = 0x3a0000
  65 *                    Interval = 5s
  66 *   linear-factors : offset = 0x0000 scale  = 0x1000
  67 *                    offset = 0x0091 scale  = 0x0bae
  68 *
  69 * CPU Fan control loop. The loop is identical for all models. it
  70 * has an additional pair of scaling factor. This is used to scale the
  71 * systems fan control loop target result (the one before it gets scaled
  72 * by the System Fans control loop itself). Then, the max value of the
  73 * calculated target value and system fan value is sent to the fans
  74 *
  75 *   controls       : cpu-fan
  76 *   sensors        : cpu-temp cpu-power
  77 *   PID params     : From SMU sdb partition
  78 *   linear-factors : offset = 0xfb50 scale  = 0x1000
  79 *
  80 * CPU Slew control loop. Not implemented. The cpufreq driver in linux is
  81 * completely separate for now, though we could find a way to link it, either
  82 * as a client reacting to overtemp notifications, or directling monitoring
  83 * the CPU temperature
  84 *
  85 * WARNING ! The CPU control loop requires the CPU tmax for the current
  86 * operating point. However, we currently are completely separated from
  87 * the cpufreq driver and thus do not know what the current operating
  88 * point is. Fortunately, we also do not have any hardware supporting anything
  89 * but operating point 0 at the moment, thus we just peek that value directly
  90 * from the SDB partition. If we ever end up with actually slewing the system
  91 * clock and thus changing operating points, we'll have to find a way to
  92 * communicate with the CPU freq driver;
  93 *
  94 */
  95
  96#include <linux/types.h>
  97#include <linux/errno.h>
  98#include <linux/kernel.h>
  99#include <linux/delay.h>
 100#include <linux/slab.h>
 101#include <linux/init.h>
 102#include <linux/spinlock.h>
 103#include <linux/wait.h>
 104#include <linux/kmod.h>
 105#include <linux/device.h>
 106#include <linux/platform_device.h>
 107#include <asm/prom.h>
 108#include <asm/machdep.h>
 109#include <asm/io.h>
 110#include <asm/sections.h>
 111#include <asm/smu.h>
 112
 113#include "windfarm.h"
 114#include "windfarm_pid.h"
 115
 116#define VERSION "0.4"
 117
 118#undef DEBUG
 119
 120#ifdef DEBUG
 121#define DBG(args...)    printk(args)
 122#else
 123#define DBG(args...)    do { } while(0)
 124#endif
 125
 126/* define this to force CPU overtemp to 74 degree, useful for testing
 127 * the overtemp code
 128 */
 129#undef HACKED_OVERTEMP
 130
 131static int wf_smu_mach_model;   /* machine model id */
 132
 133/* Controls & sensors */
 134static struct wf_sensor *sensor_cpu_power;
 135static struct wf_sensor *sensor_cpu_temp;
 136static struct wf_sensor *sensor_hd_temp;
 137static struct wf_control *fan_cpu_main;
 138static struct wf_control *fan_hd;
 139static struct wf_control *fan_system;
 140static struct wf_control *cpufreq_clamp;
 141
 142/* Set to kick the control loop into life */
 143static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
 144
 145/* Failure handling.. could be nicer */
 146#define FAILURE_FAN             0x01
 147#define FAILURE_SENSOR          0x02
 148#define FAILURE_OVERTEMP        0x04
 149
 150static unsigned int wf_smu_failure_state;
 151static int wf_smu_readjust, wf_smu_skipping;
 152
 153/*
 154 * ****** System Fans Control Loop ******
 155 *
 156 */
 157
 158/* Parameters for the System Fans control loop. Parameters
 159 * not in this table such as interval, history size, ...
 160 * are common to all versions and thus hard coded for now.
 161 */
 162struct wf_smu_sys_fans_param {
 163        int     model_id;
 164        s32     itarget;
 165        s32     gd, gp, gr;
 166
 167        s16     offset0;
 168        u16     scale0;
 169        s16     offset1;
 170        u16     scale1;
 171};
 172
 173#define WF_SMU_SYS_FANS_INTERVAL        5
 174#define WF_SMU_SYS_FANS_HISTORY_SIZE    2
 175
 176/* State data used by the system fans control loop
 177 */
 178struct wf_smu_sys_fans_state {
 179        int                     ticks;
 180        s32                     sys_setpoint;
 181        s32                     hd_setpoint;
 182        s16                     offset0;
 183        u16                     scale0;
 184        s16                     offset1;
 185        u16                     scale1;
 186        struct wf_pid_state     pid;
 187};
 188
 189/*
 190 * Configs for SMU System Fan control loop
 191 */
 192static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = {
 193        /* Model ID 2 */
 194        {
 195                .model_id       = 2,
 196                .itarget        = 0x3a0000,
 197                .gd             = 0x15400000,
 198                .gp             = 0x00200000,
 199                .gr             = 0x000002fd,
 200                .offset0        = 0xff38,
 201                .scale0         = 0x0ccd,
 202                .offset1        = 0x0208,
 203                .scale1         = 0x07ae,
 204        },
 205        /* Model ID 3 */
 206        {
 207                .model_id       = 3,
 208                .itarget        = 0x350000,
 209                .gd             = 0x08e00000,
 210                .gp             = 0x00566666,
 211                .gr             = 0x0000072b,
 212                .offset0        = 0xff38,
 213                .scale0         = 0x0ccd,
 214                .offset1        = 0x0000,
 215                .scale1         = 0x0000,
 216        },
 217        /* Model ID 5 */
 218        {
 219                .model_id       = 5,
 220                .itarget        = 0x3a0000,
 221                .gd             = 0x15400000,
 222                .gp             = 0x00233333,
 223                .gr             = 0x000002fd,
 224                .offset0        = 0x0000,
 225                .scale0         = 0x1000,
 226                .offset1        = 0x0091,
 227                .scale1         = 0x0bae,
 228        },
 229};
 230#define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params)
 231
 232static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
 233
 234/*
 235 * ****** CPU Fans Control Loop ******
 236 *
 237 */
 238
 239
 240#define WF_SMU_CPU_FANS_INTERVAL        1
 241#define WF_SMU_CPU_FANS_MAX_HISTORY     16
 242#define WF_SMU_CPU_FANS_SIBLING_SCALE   0x00001000
 243#define WF_SMU_CPU_FANS_SIBLING_OFFSET  0xfffffb50
 244
 245/* State data used by the cpu fans control loop
 246 */
 247struct wf_smu_cpu_fans_state {
 248        int                     ticks;
 249        s32                     cpu_setpoint;
 250        s32                     scale;
 251        s32                     offset;
 252        struct wf_cpu_pid_state pid;
 253};
 254
 255static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
 256
 257
 258
 259/*
 260 * ***** Implementation *****
 261 *
 262 */
 263
 264static void wf_smu_create_sys_fans(void)
 265{
 266        struct wf_smu_sys_fans_param *param = NULL;
 267        struct wf_pid_param pid_param;
 268        int i;
 269
 270        /* First, locate the params for this model */
 271        for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++)
 272                if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) {
 273                        param = &wf_smu_sys_all_params[i];
 274                        break;
 275                }
 276
 277        /* No params found, put fans to max */
 278        if (param == NULL) {
 279                printk(KERN_WARNING "windfarm: System fan config not found "
 280                       "for this machine model, max fan speed\n");
 281                goto fail;
 282        }
 283
 284        /* Alloc & initialize state */
 285        wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state),
 286                                  GFP_KERNEL);
 287        if (wf_smu_sys_fans == NULL) {
 288                printk(KERN_WARNING "windfarm: Memory allocation error"
 289                       " max fan speed\n");
 290                goto fail;
 291        }
 292        wf_smu_sys_fans->ticks = 1;
 293        wf_smu_sys_fans->scale0 = param->scale0;
 294        wf_smu_sys_fans->offset0 = param->offset0;
 295        wf_smu_sys_fans->scale1 = param->scale1;
 296        wf_smu_sys_fans->offset1 = param->offset1;
 297
 298        /* Fill PID params */
 299        pid_param.gd = param->gd;
 300        pid_param.gp = param->gp;
 301        pid_param.gr = param->gr;
 302        pid_param.interval = WF_SMU_SYS_FANS_INTERVAL;
 303        pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE;
 304        pid_param.itarget = param->itarget;
 305        pid_param.min = wf_control_get_min(fan_system);
 306        pid_param.max = wf_control_get_max(fan_system);
 307        if (fan_hd) {
 308                pid_param.min =
 309                        max(pid_param.min, wf_control_get_min(fan_hd));
 310                pid_param.max =
 311                        min(pid_param.max, wf_control_get_max(fan_hd));
 312        }
 313        wf_pid_init(&wf_smu_sys_fans->pid, &pid_param);
 314
 315        DBG("wf: System Fan control initialized.\n");
 316        DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 317            FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max);
 318        return;
 319
 320 fail:
 321
 322        if (fan_system)
 323                wf_control_set_max(fan_system);
 324        if (fan_hd)
 325                wf_control_set_max(fan_hd);
 326}
 327
 328static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
 329{
 330        s32 new_setpoint, temp, scaled, cputarget;
 331        int rc;
 332
 333        if (--st->ticks != 0) {
 334                if (wf_smu_readjust)
 335                        goto readjust;
 336                return;
 337        }
 338        st->ticks = WF_SMU_SYS_FANS_INTERVAL;
 339
 340        rc = wf_sensor_get(sensor_hd_temp, &temp);
 341        if (rc) {
 342                printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
 343                       rc);
 344                wf_smu_failure_state |= FAILURE_SENSOR;
 345                return;
 346        }
 347
 348        DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
 349            FIX32TOPRINT(temp));
 350
 351        if (temp > (st->pid.param.itarget + 0x50000))
 352                wf_smu_failure_state |= FAILURE_OVERTEMP;
 353
 354        new_setpoint = wf_pid_run(&st->pid, temp);
 355
 356        DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
 357
 358        scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
 359
 360        DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
 361
 362        cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
 363        cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
 364        scaled = max(scaled, cputarget);
 365        scaled = max(scaled, st->pid.param.min);
 366        scaled = min(scaled, st->pid.param.max);
 367
 368        DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);
 369
 370        if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
 371                return;
 372        st->sys_setpoint = scaled;
 373        st->hd_setpoint = new_setpoint;
 374 readjust:
 375        if (fan_system && wf_smu_failure_state == 0) {
 376                rc = wf_control_set(fan_system, st->sys_setpoint);
 377                if (rc) {
 378                        printk(KERN_WARNING "windfarm: Sys fan error %d\n",
 379                               rc);
 380                        wf_smu_failure_state |= FAILURE_FAN;
 381                }
 382        }
 383        if (fan_hd && wf_smu_failure_state == 0) {
 384                rc = wf_control_set(fan_hd, st->hd_setpoint);
 385                if (rc) {
 386                        printk(KERN_WARNING "windfarm: HD fan error %d\n",
 387                               rc);
 388                        wf_smu_failure_state |= FAILURE_FAN;
 389                }
 390        }
 391}
 392
 393static void wf_smu_create_cpu_fans(void)
 394{
 395        struct wf_cpu_pid_param pid_param;
 396        const struct smu_sdbp_header *hdr;
 397        struct smu_sdbp_cpupiddata *piddata;
 398        struct smu_sdbp_fvt *fvt;
 399        s32 tmax, tdelta, maxpow, powadj;
 400
 401        /* First, locate the PID params in SMU SBD */
 402        hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
 403        if (hdr == 0) {
 404                printk(KERN_WARNING "windfarm: CPU PID fan config not found "
 405                       "max fan speed\n");
 406                goto fail;
 407        }
 408        piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
 409
 410        /* Get the FVT params for operating point 0 (the only supported one
 411         * for now) in order to get tmax
 412         */
 413        hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
 414        if (hdr) {
 415                fvt = (struct smu_sdbp_fvt *)&hdr[1];
 416                tmax = ((s32)fvt->maxtemp) << 16;
 417        } else
 418                tmax = 0x5e0000; /* 94 degree default */
 419
 420        /* Alloc & initialize state */
 421        wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
 422                                  GFP_KERNEL);
 423        if (wf_smu_cpu_fans == NULL)
 424                goto fail;
 425        wf_smu_cpu_fans->ticks = 1;
 426
 427        wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
 428        wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
 429
 430        /* Fill PID params */
 431        pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
 432        pid_param.history_len = piddata->history_len;
 433        if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
 434                printk(KERN_WARNING "windfarm: History size overflow on "
 435                       "CPU control loop (%d)\n", piddata->history_len);
 436                pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
 437        }
 438        pid_param.gd = piddata->gd;
 439        pid_param.gp = piddata->gp;
 440        pid_param.gr = piddata->gr / pid_param.history_len;
 441
 442        tdelta = ((s32)piddata->target_temp_delta) << 16;
 443        maxpow = ((s32)piddata->max_power) << 16;
 444        powadj = ((s32)piddata->power_adj) << 16;
 445
 446        pid_param.tmax = tmax;
 447        pid_param.ttarget = tmax - tdelta;
 448        pid_param.pmaxadj = maxpow - powadj;
 449
 450        pid_param.min = wf_control_get_min(fan_cpu_main);
 451        pid_param.max = wf_control_get_max(fan_cpu_main);
 452
 453        wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
 454
 455        DBG("wf: CPU Fan control initialized.\n");
 456        DBG("    ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
 457            FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
 458            pid_param.min, pid_param.max);
 459
 460        return;
 461
 462 fail:
 463        printk(KERN_WARNING "windfarm: CPU fan config not found\n"
 464               "for this machine model, max fan speed\n");
 465
 466        if (cpufreq_clamp)
 467                wf_control_set_max(cpufreq_clamp);
 468        if (fan_cpu_main)
 469                wf_control_set_max(fan_cpu_main);
 470}
 471
 472static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
 473{
 474        s32 new_setpoint, temp, power, systarget;
 475        int rc;
 476
 477        if (--st->ticks != 0) {
 478                if (wf_smu_readjust)
 479                        goto readjust;
 480                return;
 481        }
 482        st->ticks = WF_SMU_CPU_FANS_INTERVAL;
 483
 484        rc = wf_sensor_get(sensor_cpu_temp, &temp);
 485        if (rc) {
 486                printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
 487                       rc);
 488                wf_smu_failure_state |= FAILURE_SENSOR;
 489                return;
 490        }
 491
 492        rc = wf_sensor_get(sensor_cpu_power, &power);
 493        if (rc) {
 494                printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
 495                       rc);
 496                wf_smu_failure_state |= FAILURE_SENSOR;
 497                return;
 498        }
 499
 500        DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
 501            FIX32TOPRINT(temp), FIX32TOPRINT(power));
 502
 503#ifdef HACKED_OVERTEMP
 504        if (temp > 0x4a0000)
 505                wf_smu_failure_state |= FAILURE_OVERTEMP;
 506#else
 507        if (temp > st->pid.param.tmax)
 508                wf_smu_failure_state |= FAILURE_OVERTEMP;
 509#endif
 510        new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
 511
 512        DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
 513
 514        systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
 515        systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
 516                + st->offset;
 517        new_setpoint = max(new_setpoint, systarget);
 518        new_setpoint = max(new_setpoint, st->pid.param.min);
 519        new_setpoint = min(new_setpoint, st->pid.param.max);
 520
 521        DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint);
 522
 523        if (st->cpu_setpoint == new_setpoint)
 524                return;
 525        st->cpu_setpoint = new_setpoint;
 526 readjust:
 527        if (fan_cpu_main && wf_smu_failure_state == 0) {
 528                rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
 529                if (rc) {
 530                        printk(KERN_WARNING "windfarm: CPU main fan"
 531                               " error %d\n", rc);
 532                        wf_smu_failure_state |= FAILURE_FAN;
 533                }
 534        }
 535}
 536
 537/*
 538 * ****** Setup / Init / Misc ... ******
 539 *
 540 */
 541
 542static void wf_smu_tick(void)
 543{
 544        unsigned int last_failure = wf_smu_failure_state;
 545        unsigned int new_failure;
 546
 547        if (!wf_smu_started) {
 548                DBG("wf: creating control loops !\n");
 549                wf_smu_create_sys_fans();
 550                wf_smu_create_cpu_fans();
 551                wf_smu_started = 1;
 552        }
 553
 554        /* Skipping ticks */
 555        if (wf_smu_skipping && --wf_smu_skipping)
 556                return;
 557
 558        wf_smu_failure_state = 0;
 559        if (wf_smu_sys_fans)
 560                wf_smu_sys_fans_tick(wf_smu_sys_fans);
 561        if (wf_smu_cpu_fans)
 562                wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
 563
 564        wf_smu_readjust = 0;
 565        new_failure = wf_smu_failure_state & ~last_failure;
 566
 567        /* If entering failure mode, clamp cpufreq and ramp all
 568         * fans to full speed.
 569         */
 570        if (wf_smu_failure_state && !last_failure) {
 571                if (cpufreq_clamp)
 572                        wf_control_set_max(cpufreq_clamp);
 573                if (fan_system)
 574                        wf_control_set_max(fan_system);
 575                if (fan_cpu_main)
 576                        wf_control_set_max(fan_cpu_main);
 577                if (fan_hd)
 578                        wf_control_set_max(fan_hd);
 579        }
 580
 581        /* If leaving failure mode, unclamp cpufreq and readjust
 582         * all fans on next iteration
 583         */
 584        if (!wf_smu_failure_state && last_failure) {
 585                if (cpufreq_clamp)
 586                        wf_control_set_min(cpufreq_clamp);
 587                wf_smu_readjust = 1;
 588        }
 589
 590        /* Overtemp condition detected, notify and start skipping a couple
 591         * ticks to let the temperature go down
 592         */
 593        if (new_failure & FAILURE_OVERTEMP) {
 594                wf_set_overtemp();
 595                wf_smu_skipping = 2;
 596        }
 597
 598        /* We only clear the overtemp condition if overtemp is cleared
 599         * _and_ no other failure is present. Since a sensor error will
 600         * clear the overtemp condition (can't measure temperature) at
 601         * the control loop levels, but we don't want to keep it clear
 602         * here in this case
 603         */
 604        if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
 605                wf_clear_overtemp();
 606}
 607
 608static void wf_smu_new_control(struct wf_control *ct)
 609{
 610        if (wf_smu_all_controls_ok)
 611                return;
 612
 613        if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
 614                if (wf_get_control(ct) == 0)
 615                        fan_cpu_main = ct;
 616        }
 617
 618        if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
 619                if (wf_get_control(ct) == 0)
 620                        fan_system = ct;
 621        }
 622
 623        if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
 624                if (wf_get_control(ct) == 0)
 625                        cpufreq_clamp = ct;
 626        }
 627
 628        /* Darwin property list says the HD fan is only for model ID
 629         * 0, 1, 2 and 3
 630         */
 631
 632        if (wf_smu_mach_model > 3) {
 633                if (fan_system && fan_cpu_main && cpufreq_clamp)
 634                        wf_smu_all_controls_ok = 1;
 635                return;
 636        }
 637
 638        if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
 639                if (wf_get_control(ct) == 0)
 640                        fan_hd = ct;
 641        }
 642
 643        if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
 644                wf_smu_all_controls_ok = 1;
 645}
 646
 647static void wf_smu_new_sensor(struct wf_sensor *sr)
 648{
 649        if (wf_smu_all_sensors_ok)
 650                return;
 651
 652        if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
 653                if (wf_get_sensor(sr) == 0)
 654                        sensor_cpu_power = sr;
 655        }
 656
 657        if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
 658                if (wf_get_sensor(sr) == 0)
 659                        sensor_cpu_temp = sr;
 660        }
 661
 662        if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
 663                if (wf_get_sensor(sr) == 0)
 664                        sensor_hd_temp = sr;
 665        }
 666
 667        if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
 668                wf_smu_all_sensors_ok = 1;
 669}
 670
 671
 672static int wf_smu_notify(struct notifier_block *self,
 673                               unsigned long event, void *data)
 674{
 675        switch(event) {
 676        case WF_EVENT_NEW_CONTROL:
 677                DBG("wf: new control %s detected\n",
 678                    ((struct wf_control *)data)->name);
 679                wf_smu_new_control(data);
 680                wf_smu_readjust = 1;
 681                break;
 682        case WF_EVENT_NEW_SENSOR:
 683                DBG("wf: new sensor %s detected\n",
 684                    ((struct wf_sensor *)data)->name);
 685                wf_smu_new_sensor(data);
 686                break;
 687        case WF_EVENT_TICK:
 688                if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
 689                        wf_smu_tick();
 690        }
 691
 692        return 0;
 693}
 694
 695static struct notifier_block wf_smu_events = {
 696        .notifier_call  = wf_smu_notify,
 697};
 698
 699static int wf_init_pm(void)
 700{
 701        const struct smu_sdbp_header *hdr;
 702
 703        hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
 704        if (hdr != 0) {
 705                struct smu_sdbp_sensortree *st =
 706                        (struct smu_sdbp_sensortree *)&hdr[1];
 707                wf_smu_mach_model = st->model_id;
 708        }
 709
 710        printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
 711               wf_smu_mach_model);
 712
 713        return 0;
 714}
 715
 716static int wf_smu_probe(struct platform_device *ddev)
 717{
 718        wf_register_client(&wf_smu_events);
 719
 720        return 0;
 721}
 722
 723static int __devexit wf_smu_remove(struct platform_device *ddev)
 724{
 725        wf_unregister_client(&wf_smu_events);
 726
 727        /* XXX We don't have yet a guarantee that our callback isn't
 728         * in progress when returning from wf_unregister_client, so
 729         * we add an arbitrary delay. I'll have to fix that in the core
 730         */
 731        msleep(1000);
 732
 733        /* Release all sensors */
 734        /* One more crappy race: I don't think we have any guarantee here
 735         * that the attribute callback won't race with the sensor beeing
 736         * disposed of, and I'm not 100% certain what best way to deal
 737         * with that except by adding locks all over... I'll do that
 738         * eventually but heh, who ever rmmod this module anyway ?
 739         */
 740        if (sensor_cpu_power)
 741                wf_put_sensor(sensor_cpu_power);
 742        if (sensor_cpu_temp)
 743                wf_put_sensor(sensor_cpu_temp);
 744        if (sensor_hd_temp)
 745                wf_put_sensor(sensor_hd_temp);
 746
 747        /* Release all controls */
 748        if (fan_cpu_main)
 749                wf_put_control(fan_cpu_main);
 750        if (fan_hd)
 751                wf_put_control(fan_hd);
 752        if (fan_system)
 753                wf_put_control(fan_system);
 754        if (cpufreq_clamp)
 755                wf_put_control(cpufreq_clamp);
 756
 757        /* Destroy control loops state structures */
 758        kfree(wf_smu_sys_fans);
 759        kfree(wf_smu_cpu_fans);
 760
 761        return 0;
 762}
 763
 764static struct platform_driver wf_smu_driver = {
 765        .probe = wf_smu_probe,
 766        .remove = __devexit_p(wf_smu_remove),
 767        .driver = {
 768                .name = "windfarm",
 769                .owner  = THIS_MODULE,
 770        },
 771};
 772
 773
 774static int __init wf_smu_init(void)
 775{
 776        int rc = -ENODEV;
 777
 778        if (of_machine_is_compatible("PowerMac8,1") ||
 779            of_machine_is_compatible("PowerMac8,2"))
 780                rc = wf_init_pm();
 781
 782        if (rc == 0) {
 783#ifdef MODULE
 784                request_module("windfarm_smu_controls");
 785                request_module("windfarm_smu_sensors");
 786                request_module("windfarm_lm75_sensor");
 787                request_module("windfarm_cpufreq_clamp");
 788
 789#endif /* MODULE */
 790                platform_driver_register(&wf_smu_driver);
 791        }
 792
 793        return rc;
 794}
 795
 796static void __exit wf_smu_exit(void)
 797{
 798
 799        platform_driver_unregister(&wf_smu_driver);
 800}
 801
 802
 803module_init(wf_smu_init);
 804module_exit(wf_smu_exit);
 805
 806MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 807MODULE_DESCRIPTION("Thermal control logic for iMac G5");
 808MODULE_LICENSE("GPL");
 809MODULE_ALIAS("platform:windfarm");
 810
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