Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 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 |
Adrian Bunk | 943ffb5 | 2006-01-10 00:10:13 +0100 | [diff] [blame] | 29 | * - the value of the target of the CPU Fan control loop is retrieved, |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 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/system.h> |
| 111 | #include <asm/sections.h> |
| 112 | #include <asm/smu.h> |
| 113 | |
| 114 | #include "windfarm.h" |
| 115 | #include "windfarm_pid.h" |
| 116 | |
| 117 | #define VERSION "0.4" |
| 118 | |
| 119 | #undef DEBUG |
| 120 | |
| 121 | #ifdef DEBUG |
| 122 | #define DBG(args...) printk(args) |
| 123 | #else |
| 124 | #define DBG(args...) do { } while(0) |
| 125 | #endif |
| 126 | |
| 127 | /* define this to force CPU overtemp to 74 degree, useful for testing |
| 128 | * the overtemp code |
| 129 | */ |
| 130 | #undef HACKED_OVERTEMP |
| 131 | |
| 132 | static int wf_smu_mach_model; /* machine model id */ |
| 133 | |
| 134 | static struct device *wf_smu_dev; |
| 135 | |
| 136 | /* Controls & sensors */ |
| 137 | static struct wf_sensor *sensor_cpu_power; |
| 138 | static struct wf_sensor *sensor_cpu_temp; |
| 139 | static struct wf_sensor *sensor_hd_temp; |
| 140 | static struct wf_control *fan_cpu_main; |
| 141 | static struct wf_control *fan_hd; |
| 142 | static struct wf_control *fan_system; |
| 143 | static struct wf_control *cpufreq_clamp; |
| 144 | |
| 145 | /* Set to kick the control loop into life */ |
| 146 | static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started; |
| 147 | |
| 148 | /* Failure handling.. could be nicer */ |
| 149 | #define FAILURE_FAN 0x01 |
| 150 | #define FAILURE_SENSOR 0x02 |
| 151 | #define FAILURE_OVERTEMP 0x04 |
| 152 | |
| 153 | static unsigned int wf_smu_failure_state; |
| 154 | static int wf_smu_readjust, wf_smu_skipping; |
| 155 | |
| 156 | /* |
| 157 | * ****** System Fans Control Loop ****** |
| 158 | * |
| 159 | */ |
| 160 | |
| 161 | /* Parameters for the System Fans control loop. Parameters |
| 162 | * not in this table such as interval, history size, ... |
| 163 | * are common to all versions and thus hard coded for now. |
| 164 | */ |
| 165 | struct wf_smu_sys_fans_param { |
| 166 | int model_id; |
| 167 | s32 itarget; |
| 168 | s32 gd, gp, gr; |
| 169 | |
| 170 | s16 offset0; |
| 171 | u16 scale0; |
| 172 | s16 offset1; |
| 173 | u16 scale1; |
| 174 | }; |
| 175 | |
| 176 | #define WF_SMU_SYS_FANS_INTERVAL 5 |
| 177 | #define WF_SMU_SYS_FANS_HISTORY_SIZE 2 |
| 178 | |
| 179 | /* State data used by the system fans control loop |
| 180 | */ |
| 181 | struct wf_smu_sys_fans_state { |
| 182 | int ticks; |
| 183 | s32 sys_setpoint; |
| 184 | s32 hd_setpoint; |
| 185 | s16 offset0; |
| 186 | u16 scale0; |
| 187 | s16 offset1; |
| 188 | u16 scale1; |
| 189 | struct wf_pid_state pid; |
| 190 | }; |
| 191 | |
| 192 | /* |
| 193 | * Configs for SMU Sytem Fan control loop |
| 194 | */ |
| 195 | static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = { |
| 196 | /* Model ID 2 */ |
| 197 | { |
| 198 | .model_id = 2, |
| 199 | .itarget = 0x3a0000, |
| 200 | .gd = 0x15400000, |
| 201 | .gp = 0x00200000, |
| 202 | .gr = 0x000002fd, |
| 203 | .offset0 = 0xff38, |
| 204 | .scale0 = 0x0ccd, |
| 205 | .offset1 = 0x0208, |
| 206 | .scale1 = 0x07ae, |
| 207 | }, |
| 208 | /* Model ID 3 */ |
| 209 | { |
Michal Ostrowski | 326743e | 2005-12-08 16:56:17 +1100 | [diff] [blame] | 210 | .model_id = 3, |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 211 | .itarget = 0x350000, |
| 212 | .gd = 0x08e00000, |
| 213 | .gp = 0x00566666, |
| 214 | .gr = 0x0000072b, |
| 215 | .offset0 = 0xff38, |
| 216 | .scale0 = 0x0ccd, |
| 217 | .offset1 = 0x0000, |
| 218 | .scale1 = 0x0000, |
| 219 | }, |
| 220 | /* Model ID 5 */ |
| 221 | { |
Michal Ostrowski | 326743e | 2005-12-08 16:56:17 +1100 | [diff] [blame] | 222 | .model_id = 5, |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 223 | .itarget = 0x3a0000, |
| 224 | .gd = 0x15400000, |
| 225 | .gp = 0x00233333, |
| 226 | .gr = 0x000002fd, |
| 227 | .offset0 = 0x0000, |
| 228 | .scale0 = 0x1000, |
| 229 | .offset1 = 0x0091, |
| 230 | .scale1 = 0x0bae, |
| 231 | }, |
| 232 | }; |
| 233 | #define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params) |
| 234 | |
| 235 | static struct wf_smu_sys_fans_state *wf_smu_sys_fans; |
| 236 | |
| 237 | /* |
| 238 | * ****** CPU Fans Control Loop ****** |
| 239 | * |
| 240 | */ |
| 241 | |
| 242 | |
| 243 | #define WF_SMU_CPU_FANS_INTERVAL 1 |
| 244 | #define WF_SMU_CPU_FANS_MAX_HISTORY 16 |
| 245 | #define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000 |
| 246 | #define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50 |
| 247 | |
| 248 | /* State data used by the cpu fans control loop |
| 249 | */ |
| 250 | struct wf_smu_cpu_fans_state { |
| 251 | int ticks; |
| 252 | s32 cpu_setpoint; |
| 253 | s32 scale; |
| 254 | s32 offset; |
| 255 | struct wf_cpu_pid_state pid; |
| 256 | }; |
| 257 | |
| 258 | static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; |
| 259 | |
| 260 | |
| 261 | |
| 262 | /* |
| 263 | * ***** Implementation ***** |
| 264 | * |
| 265 | */ |
| 266 | |
| 267 | static void wf_smu_create_sys_fans(void) |
| 268 | { |
| 269 | struct wf_smu_sys_fans_param *param = NULL; |
| 270 | struct wf_pid_param pid_param; |
| 271 | int i; |
| 272 | |
| 273 | /* First, locate the params for this model */ |
| 274 | for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++) |
| 275 | if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) { |
| 276 | param = &wf_smu_sys_all_params[i]; |
| 277 | break; |
| 278 | } |
| 279 | |
| 280 | /* No params found, put fans to max */ |
| 281 | if (param == NULL) { |
| 282 | printk(KERN_WARNING "windfarm: System fan config not found " |
| 283 | "for this machine model, max fan speed\n"); |
| 284 | goto fail; |
| 285 | } |
| 286 | |
| 287 | /* Alloc & initialize state */ |
| 288 | wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state), |
| 289 | GFP_KERNEL); |
| 290 | if (wf_smu_sys_fans == NULL) { |
| 291 | printk(KERN_WARNING "windfarm: Memory allocation error" |
| 292 | " max fan speed\n"); |
| 293 | goto fail; |
| 294 | } |
| 295 | wf_smu_sys_fans->ticks = 1; |
| 296 | wf_smu_sys_fans->scale0 = param->scale0; |
| 297 | wf_smu_sys_fans->offset0 = param->offset0; |
| 298 | wf_smu_sys_fans->scale1 = param->scale1; |
| 299 | wf_smu_sys_fans->offset1 = param->offset1; |
| 300 | |
| 301 | /* Fill PID params */ |
| 302 | pid_param.gd = param->gd; |
| 303 | pid_param.gp = param->gp; |
| 304 | pid_param.gr = param->gr; |
| 305 | pid_param.interval = WF_SMU_SYS_FANS_INTERVAL; |
| 306 | pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE; |
| 307 | pid_param.itarget = param->itarget; |
| 308 | pid_param.min = fan_system->ops->get_min(fan_system); |
| 309 | pid_param.max = fan_system->ops->get_max(fan_system); |
| 310 | if (fan_hd) { |
| 311 | pid_param.min = |
| 312 | max(pid_param.min,fan_hd->ops->get_min(fan_hd)); |
| 313 | pid_param.max = |
| 314 | min(pid_param.max,fan_hd->ops->get_max(fan_hd)); |
| 315 | } |
| 316 | wf_pid_init(&wf_smu_sys_fans->pid, &pid_param); |
| 317 | |
| 318 | DBG("wf: System Fan control initialized.\n"); |
| 319 | DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", |
| 320 | FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max); |
| 321 | return; |
| 322 | |
| 323 | fail: |
| 324 | |
| 325 | if (fan_system) |
| 326 | wf_control_set_max(fan_system); |
| 327 | if (fan_hd) |
| 328 | wf_control_set_max(fan_hd); |
| 329 | } |
| 330 | |
| 331 | static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st) |
| 332 | { |
| 333 | s32 new_setpoint, temp, scaled, cputarget; |
| 334 | int rc; |
| 335 | |
| 336 | if (--st->ticks != 0) { |
| 337 | if (wf_smu_readjust) |
| 338 | goto readjust; |
| 339 | return; |
| 340 | } |
| 341 | st->ticks = WF_SMU_SYS_FANS_INTERVAL; |
| 342 | |
| 343 | rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp); |
| 344 | if (rc) { |
| 345 | printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", |
| 346 | rc); |
| 347 | wf_smu_failure_state |= FAILURE_SENSOR; |
| 348 | return; |
| 349 | } |
| 350 | |
| 351 | DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n", |
| 352 | FIX32TOPRINT(temp)); |
| 353 | |
| 354 | if (temp > (st->pid.param.itarget + 0x50000)) |
| 355 | wf_smu_failure_state |= FAILURE_OVERTEMP; |
| 356 | |
| 357 | new_setpoint = wf_pid_run(&st->pid, temp); |
| 358 | |
| 359 | DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); |
| 360 | |
| 361 | scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0; |
| 362 | |
| 363 | DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled); |
| 364 | |
| 365 | cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0; |
| 366 | cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1; |
| 367 | scaled = max(scaled, cputarget); |
| 368 | scaled = max(scaled, st->pid.param.min); |
| 369 | scaled = min(scaled, st->pid.param.max); |
| 370 | |
| 371 | DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled); |
| 372 | |
| 373 | if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint) |
| 374 | return; |
| 375 | st->sys_setpoint = scaled; |
| 376 | st->hd_setpoint = new_setpoint; |
| 377 | readjust: |
| 378 | if (fan_system && wf_smu_failure_state == 0) { |
| 379 | rc = fan_system->ops->set_value(fan_system, st->sys_setpoint); |
| 380 | if (rc) { |
| 381 | printk(KERN_WARNING "windfarm: Sys fan error %d\n", |
| 382 | rc); |
| 383 | wf_smu_failure_state |= FAILURE_FAN; |
| 384 | } |
| 385 | } |
| 386 | if (fan_hd && wf_smu_failure_state == 0) { |
| 387 | rc = fan_hd->ops->set_value(fan_hd, st->hd_setpoint); |
| 388 | if (rc) { |
| 389 | printk(KERN_WARNING "windfarm: HD fan error %d\n", |
| 390 | rc); |
| 391 | wf_smu_failure_state |= FAILURE_FAN; |
| 392 | } |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | static void wf_smu_create_cpu_fans(void) |
| 397 | { |
| 398 | struct wf_cpu_pid_param pid_param; |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 399 | const struct smu_sdbp_header *hdr; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 400 | struct smu_sdbp_cpupiddata *piddata; |
| 401 | struct smu_sdbp_fvt *fvt; |
| 402 | s32 tmax, tdelta, maxpow, powadj; |
| 403 | |
| 404 | /* First, locate the PID params in SMU SBD */ |
| 405 | hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); |
| 406 | if (hdr == 0) { |
| 407 | printk(KERN_WARNING "windfarm: CPU PID fan config not found " |
| 408 | "max fan speed\n"); |
| 409 | goto fail; |
| 410 | } |
| 411 | piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; |
| 412 | |
| 413 | /* Get the FVT params for operating point 0 (the only supported one |
| 414 | * for now) in order to get tmax |
| 415 | */ |
| 416 | hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); |
| 417 | if (hdr) { |
| 418 | fvt = (struct smu_sdbp_fvt *)&hdr[1]; |
| 419 | tmax = ((s32)fvt->maxtemp) << 16; |
| 420 | } else |
| 421 | tmax = 0x5e0000; /* 94 degree default */ |
| 422 | |
| 423 | /* Alloc & initialize state */ |
| 424 | wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), |
| 425 | GFP_KERNEL); |
| 426 | if (wf_smu_cpu_fans == NULL) |
| 427 | goto fail; |
| 428 | wf_smu_cpu_fans->ticks = 1; |
| 429 | |
| 430 | wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE; |
| 431 | wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET; |
| 432 | |
| 433 | /* Fill PID params */ |
| 434 | pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; |
| 435 | pid_param.history_len = piddata->history_len; |
| 436 | if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { |
| 437 | printk(KERN_WARNING "windfarm: History size overflow on " |
| 438 | "CPU control loop (%d)\n", piddata->history_len); |
| 439 | pid_param.history_len = WF_CPU_PID_MAX_HISTORY; |
| 440 | } |
| 441 | pid_param.gd = piddata->gd; |
| 442 | pid_param.gp = piddata->gp; |
| 443 | pid_param.gr = piddata->gr / pid_param.history_len; |
| 444 | |
| 445 | tdelta = ((s32)piddata->target_temp_delta) << 16; |
| 446 | maxpow = ((s32)piddata->max_power) << 16; |
| 447 | powadj = ((s32)piddata->power_adj) << 16; |
| 448 | |
| 449 | pid_param.tmax = tmax; |
| 450 | pid_param.ttarget = tmax - tdelta; |
| 451 | pid_param.pmaxadj = maxpow - powadj; |
| 452 | |
| 453 | pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main); |
| 454 | pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main); |
| 455 | |
| 456 | wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); |
| 457 | |
| 458 | DBG("wf: CPU Fan control initialized.\n"); |
| 459 | DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", |
| 460 | FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), |
| 461 | pid_param.min, pid_param.max); |
| 462 | |
| 463 | return; |
| 464 | |
| 465 | fail: |
| 466 | printk(KERN_WARNING "windfarm: CPU fan config not found\n" |
| 467 | "for this machine model, max fan speed\n"); |
| 468 | |
| 469 | if (cpufreq_clamp) |
| 470 | wf_control_set_max(cpufreq_clamp); |
| 471 | if (fan_cpu_main) |
| 472 | wf_control_set_max(fan_cpu_main); |
| 473 | } |
| 474 | |
| 475 | static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) |
| 476 | { |
| 477 | s32 new_setpoint, temp, power, systarget; |
| 478 | int rc; |
| 479 | |
| 480 | if (--st->ticks != 0) { |
| 481 | if (wf_smu_readjust) |
| 482 | goto readjust; |
| 483 | return; |
| 484 | } |
| 485 | st->ticks = WF_SMU_CPU_FANS_INTERVAL; |
| 486 | |
| 487 | rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); |
| 488 | if (rc) { |
| 489 | printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", |
| 490 | rc); |
| 491 | wf_smu_failure_state |= FAILURE_SENSOR; |
| 492 | return; |
| 493 | } |
| 494 | |
| 495 | rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); |
| 496 | if (rc) { |
| 497 | printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", |
| 498 | rc); |
| 499 | wf_smu_failure_state |= FAILURE_SENSOR; |
| 500 | return; |
| 501 | } |
| 502 | |
| 503 | DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", |
| 504 | FIX32TOPRINT(temp), FIX32TOPRINT(power)); |
| 505 | |
| 506 | #ifdef HACKED_OVERTEMP |
| 507 | if (temp > 0x4a0000) |
| 508 | wf_smu_failure_state |= FAILURE_OVERTEMP; |
| 509 | #else |
| 510 | if (temp > st->pid.param.tmax) |
| 511 | wf_smu_failure_state |= FAILURE_OVERTEMP; |
| 512 | #endif |
| 513 | new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); |
| 514 | |
| 515 | DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); |
| 516 | |
| 517 | systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0; |
| 518 | systarget = ((((s64)systarget) * (s64)st->scale) >> 12) |
| 519 | + st->offset; |
| 520 | new_setpoint = max(new_setpoint, systarget); |
| 521 | new_setpoint = max(new_setpoint, st->pid.param.min); |
| 522 | new_setpoint = min(new_setpoint, st->pid.param.max); |
| 523 | |
| 524 | DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint); |
| 525 | |
| 526 | if (st->cpu_setpoint == new_setpoint) |
| 527 | return; |
| 528 | st->cpu_setpoint = new_setpoint; |
| 529 | readjust: |
| 530 | if (fan_cpu_main && wf_smu_failure_state == 0) { |
| 531 | rc = fan_cpu_main->ops->set_value(fan_cpu_main, |
| 532 | st->cpu_setpoint); |
| 533 | if (rc) { |
| 534 | printk(KERN_WARNING "windfarm: CPU main fan" |
| 535 | " error %d\n", rc); |
| 536 | wf_smu_failure_state |= FAILURE_FAN; |
| 537 | } |
| 538 | } |
| 539 | } |
| 540 | |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 541 | /* |
| 542 | * ****** Setup / Init / Misc ... ****** |
| 543 | * |
| 544 | */ |
| 545 | |
| 546 | static void wf_smu_tick(void) |
| 547 | { |
| 548 | unsigned int last_failure = wf_smu_failure_state; |
| 549 | unsigned int new_failure; |
| 550 | |
| 551 | if (!wf_smu_started) { |
| 552 | DBG("wf: creating control loops !\n"); |
| 553 | wf_smu_create_sys_fans(); |
| 554 | wf_smu_create_cpu_fans(); |
| 555 | wf_smu_started = 1; |
| 556 | } |
| 557 | |
| 558 | /* Skipping ticks */ |
| 559 | if (wf_smu_skipping && --wf_smu_skipping) |
| 560 | return; |
| 561 | |
| 562 | wf_smu_failure_state = 0; |
| 563 | if (wf_smu_sys_fans) |
| 564 | wf_smu_sys_fans_tick(wf_smu_sys_fans); |
| 565 | if (wf_smu_cpu_fans) |
| 566 | wf_smu_cpu_fans_tick(wf_smu_cpu_fans); |
| 567 | |
| 568 | wf_smu_readjust = 0; |
| 569 | new_failure = wf_smu_failure_state & ~last_failure; |
| 570 | |
| 571 | /* If entering failure mode, clamp cpufreq and ramp all |
| 572 | * fans to full speed. |
| 573 | */ |
| 574 | if (wf_smu_failure_state && !last_failure) { |
| 575 | if (cpufreq_clamp) |
| 576 | wf_control_set_max(cpufreq_clamp); |
| 577 | if (fan_system) |
| 578 | wf_control_set_max(fan_system); |
| 579 | if (fan_cpu_main) |
| 580 | wf_control_set_max(fan_cpu_main); |
| 581 | if (fan_hd) |
| 582 | wf_control_set_max(fan_hd); |
| 583 | } |
| 584 | |
| 585 | /* If leaving failure mode, unclamp cpufreq and readjust |
| 586 | * all fans on next iteration |
| 587 | */ |
| 588 | if (!wf_smu_failure_state && last_failure) { |
| 589 | if (cpufreq_clamp) |
| 590 | wf_control_set_min(cpufreq_clamp); |
| 591 | wf_smu_readjust = 1; |
| 592 | } |
| 593 | |
| 594 | /* Overtemp condition detected, notify and start skipping a couple |
| 595 | * ticks to let the temperature go down |
| 596 | */ |
| 597 | if (new_failure & FAILURE_OVERTEMP) { |
| 598 | wf_set_overtemp(); |
| 599 | wf_smu_skipping = 2; |
| 600 | } |
| 601 | |
| 602 | /* We only clear the overtemp condition if overtemp is cleared |
| 603 | * _and_ no other failure is present. Since a sensor error will |
| 604 | * clear the overtemp condition (can't measure temperature) at |
| 605 | * the control loop levels, but we don't want to keep it clear |
| 606 | * here in this case |
| 607 | */ |
| 608 | if (new_failure == 0 && last_failure & FAILURE_OVERTEMP) |
| 609 | wf_clear_overtemp(); |
| 610 | } |
| 611 | |
| 612 | static void wf_smu_new_control(struct wf_control *ct) |
| 613 | { |
| 614 | if (wf_smu_all_controls_ok) |
| 615 | return; |
| 616 | |
| 617 | if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 618 | if (wf_get_control(ct) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 619 | fan_cpu_main = ct; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 620 | } |
| 621 | |
| 622 | if (fan_system == NULL && !strcmp(ct->name, "system-fan")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 623 | if (wf_get_control(ct) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 624 | fan_system = ct; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { |
| 628 | if (wf_get_control(ct) == 0) |
| 629 | cpufreq_clamp = ct; |
| 630 | } |
| 631 | |
| 632 | /* Darwin property list says the HD fan is only for model ID |
| 633 | * 0, 1, 2 and 3 |
| 634 | */ |
| 635 | |
| 636 | if (wf_smu_mach_model > 3) { |
| 637 | if (fan_system && fan_cpu_main && cpufreq_clamp) |
| 638 | wf_smu_all_controls_ok = 1; |
| 639 | return; |
| 640 | } |
| 641 | |
| 642 | if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 643 | if (wf_get_control(ct) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 644 | fan_hd = ct; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 645 | } |
| 646 | |
| 647 | if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp) |
| 648 | wf_smu_all_controls_ok = 1; |
| 649 | } |
| 650 | |
| 651 | static void wf_smu_new_sensor(struct wf_sensor *sr) |
| 652 | { |
| 653 | if (wf_smu_all_sensors_ok) |
| 654 | return; |
| 655 | |
| 656 | if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 657 | if (wf_get_sensor(sr) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 658 | sensor_cpu_power = sr; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 659 | } |
| 660 | |
| 661 | if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 662 | if (wf_get_sensor(sr) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 663 | sensor_cpu_temp = sr; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 664 | } |
| 665 | |
| 666 | if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 667 | if (wf_get_sensor(sr) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 668 | sensor_hd_temp = sr; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 669 | } |
| 670 | |
| 671 | if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp) |
| 672 | wf_smu_all_sensors_ok = 1; |
| 673 | } |
| 674 | |
| 675 | |
| 676 | static int wf_smu_notify(struct notifier_block *self, |
| 677 | unsigned long event, void *data) |
| 678 | { |
| 679 | switch(event) { |
| 680 | case WF_EVENT_NEW_CONTROL: |
| 681 | DBG("wf: new control %s detected\n", |
| 682 | ((struct wf_control *)data)->name); |
| 683 | wf_smu_new_control(data); |
| 684 | wf_smu_readjust = 1; |
| 685 | break; |
| 686 | case WF_EVENT_NEW_SENSOR: |
| 687 | DBG("wf: new sensor %s detected\n", |
| 688 | ((struct wf_sensor *)data)->name); |
| 689 | wf_smu_new_sensor(data); |
| 690 | break; |
| 691 | case WF_EVENT_TICK: |
| 692 | if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) |
| 693 | wf_smu_tick(); |
| 694 | } |
| 695 | |
| 696 | return 0; |
| 697 | } |
| 698 | |
| 699 | static struct notifier_block wf_smu_events = { |
| 700 | .notifier_call = wf_smu_notify, |
| 701 | }; |
| 702 | |
| 703 | static int wf_init_pm(void) |
| 704 | { |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 705 | const struct smu_sdbp_header *hdr; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 706 | |
| 707 | hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); |
| 708 | if (hdr != 0) { |
| 709 | struct smu_sdbp_sensortree *st = |
| 710 | (struct smu_sdbp_sensortree *)&hdr[1]; |
| 711 | wf_smu_mach_model = st->model_id; |
| 712 | } |
| 713 | |
| 714 | printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n", |
| 715 | wf_smu_mach_model); |
| 716 | |
| 717 | return 0; |
| 718 | } |
| 719 | |
| 720 | static int wf_smu_probe(struct device *ddev) |
| 721 | { |
| 722 | wf_smu_dev = ddev; |
| 723 | |
| 724 | wf_register_client(&wf_smu_events); |
| 725 | |
| 726 | return 0; |
| 727 | } |
| 728 | |
| 729 | static int wf_smu_remove(struct device *ddev) |
| 730 | { |
| 731 | wf_unregister_client(&wf_smu_events); |
| 732 | |
| 733 | /* XXX We don't have yet a guarantee that our callback isn't |
| 734 | * in progress when returning from wf_unregister_client, so |
| 735 | * we add an arbitrary delay. I'll have to fix that in the core |
| 736 | */ |
| 737 | msleep(1000); |
| 738 | |
| 739 | /* Release all sensors */ |
| 740 | /* One more crappy race: I don't think we have any guarantee here |
| 741 | * that the attribute callback won't race with the sensor beeing |
| 742 | * disposed of, and I'm not 100% certain what best way to deal |
| 743 | * with that except by adding locks all over... I'll do that |
| 744 | * eventually but heh, who ever rmmod this module anyway ? |
| 745 | */ |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 746 | if (sensor_cpu_power) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 747 | wf_put_sensor(sensor_cpu_power); |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 748 | if (sensor_cpu_temp) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 749 | wf_put_sensor(sensor_cpu_temp); |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 750 | if (sensor_hd_temp) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 751 | wf_put_sensor(sensor_hd_temp); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 752 | |
| 753 | /* Release all controls */ |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 754 | if (fan_cpu_main) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 755 | wf_put_control(fan_cpu_main); |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 756 | if (fan_hd) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 757 | wf_put_control(fan_hd); |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 758 | if (fan_system) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 759 | wf_put_control(fan_system); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 760 | if (cpufreq_clamp) |
| 761 | wf_put_control(cpufreq_clamp); |
| 762 | |
| 763 | /* Destroy control loops state structures */ |
| 764 | if (wf_smu_sys_fans) |
| 765 | kfree(wf_smu_sys_fans); |
| 766 | if (wf_smu_cpu_fans) |
| 767 | kfree(wf_smu_cpu_fans); |
| 768 | |
| 769 | wf_smu_dev = NULL; |
| 770 | |
| 771 | return 0; |
| 772 | } |
| 773 | |
| 774 | static struct device_driver wf_smu_driver = { |
| 775 | .name = "windfarm", |
| 776 | .bus = &platform_bus_type, |
| 777 | .probe = wf_smu_probe, |
| 778 | .remove = wf_smu_remove, |
| 779 | }; |
| 780 | |
| 781 | |
| 782 | static int __init wf_smu_init(void) |
| 783 | { |
| 784 | int rc = -ENODEV; |
| 785 | |
| 786 | if (machine_is_compatible("PowerMac8,1") || |
| 787 | machine_is_compatible("PowerMac8,2")) |
| 788 | rc = wf_init_pm(); |
| 789 | |
| 790 | if (rc == 0) { |
| 791 | #ifdef MODULE |
| 792 | request_module("windfarm_smu_controls"); |
| 793 | request_module("windfarm_smu_sensors"); |
| 794 | request_module("windfarm_lm75_sensor"); |
| 795 | |
| 796 | #endif /* MODULE */ |
| 797 | driver_register(&wf_smu_driver); |
| 798 | } |
| 799 | |
| 800 | return rc; |
| 801 | } |
| 802 | |
| 803 | static void __exit wf_smu_exit(void) |
| 804 | { |
| 805 | |
| 806 | driver_unregister(&wf_smu_driver); |
| 807 | } |
| 808 | |
| 809 | |
| 810 | module_init(wf_smu_init); |
| 811 | module_exit(wf_smu_exit); |
| 812 | |
| 813 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); |
| 814 | MODULE_DESCRIPTION("Thermal control logic for iMac G5"); |
| 815 | MODULE_LICENSE("GPL"); |
| 816 | |