drivers/macintosh/windfarm_pm81.c

   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
 131 static int wf_smu_mach_model;   /* machine model id */
 132
 133 /* Controls & sensors */
 134 static struct wf_sensor *sensor_cpu_power;
 135 static struct wf_sensor *sensor_cpu_temp;
 136 static struct wf_sensor *sensor_hd_temp;
 137 static struct wf_control *fan_cpu_main;
 138 static struct wf_control *fan_hd;
 139 static struct wf_control *fan_system;
 140 static struct wf_control *cpufreq_clamp;
 141
 142 /* Set to kick the control loop into life */
 143 static 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
 150 static unsigned int wf_smu_failure_state;
 151 static 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  */
 162 struct 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  */
 178 struct 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  */
 192 static 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
 232 static 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  */
 247 struct 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
 255 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
 256
 257
 258
 259 /*
 260  * ***** Implementation *****
 261  *
 262  */
 263
 264 static 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
 328 static 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
 393 static 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
 472 static 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
 542 static 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
 608 static 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
 647 static 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
 672 static 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
 695 static struct notifier_block wf_smu_events = {
 696         .notifier_call  = wf_smu_notify,
 697 };
 698
 699 static 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
 716 static int wf_smu_probe(struct platform_device *ddev)
 717 {
 718         wf_register_client(&wf_smu_events);
 719
 720         return 0;
 721 }
 722
 723 static 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
 764 static 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
 774 static 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
 796 static void __exit wf_smu_exit(void)
 797 {
 798
 799         platform_driver_unregister(&wf_smu_driver);
 800 }
 801
 802
 803 module_init(wf_smu_init);
 804 module_exit(wf_smu_exit);
 805
 806 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 807 MODULE_DESCRIPTION("Thermal control logic for iMac G5");
 808 MODULE_LICENSE("GPL");
 809 MODULE_ALIAS("platform:windfarm");