Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops |
| 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 | * PowerMac9,1 |
| 17 | * =========== |
| 18 | * |
| 19 | * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't |
| 20 | * try to play with other control loops fans). Drive bay is rather basic PID |
| 21 | * with one sensor and one fan. Slots area is a bit different as the Darwin |
| 22 | * driver is supposed to be capable of working in a special "AGP" mode which |
| 23 | * involves the presence of an AGP sensor and an AGP fan (possibly on the |
| 24 | * AGP card itself). I can't deal with that special mode as I don't have |
| 25 | * access to those additional sensor/fans for now (though ultimately, it would |
| 26 | * be possible to add sensor objects for them) so I'm only implementing the |
| 27 | * basic PCI slot control loop |
| 28 | */ |
| 29 | |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/errno.h> |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/init.h> |
| 36 | #include <linux/spinlock.h> |
| 37 | #include <linux/wait.h> |
| 38 | #include <linux/kmod.h> |
| 39 | #include <linux/device.h> |
| 40 | #include <linux/platform_device.h> |
| 41 | #include <asm/prom.h> |
| 42 | #include <asm/machdep.h> |
| 43 | #include <asm/io.h> |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 44 | #include <asm/sections.h> |
| 45 | #include <asm/smu.h> |
| 46 | |
| 47 | #include "windfarm.h" |
| 48 | #include "windfarm_pid.h" |
| 49 | |
| 50 | #define VERSION "0.4" |
| 51 | |
| 52 | #undef DEBUG |
| 53 | |
| 54 | #ifdef DEBUG |
| 55 | #define DBG(args...) printk(args) |
| 56 | #else |
| 57 | #define DBG(args...) do { } while(0) |
| 58 | #endif |
| 59 | |
| 60 | /* define this to force CPU overtemp to 74 degree, useful for testing |
| 61 | * the overtemp code |
| 62 | */ |
| 63 | #undef HACKED_OVERTEMP |
| 64 | |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 65 | /* Controls & sensors */ |
| 66 | static struct wf_sensor *sensor_cpu_power; |
| 67 | static struct wf_sensor *sensor_cpu_temp; |
| 68 | static struct wf_sensor *sensor_hd_temp; |
| 69 | static struct wf_sensor *sensor_slots_power; |
| 70 | static struct wf_control *fan_cpu_main; |
| 71 | static struct wf_control *fan_cpu_second; |
| 72 | static struct wf_control *fan_cpu_third; |
| 73 | static struct wf_control *fan_hd; |
| 74 | static struct wf_control *fan_slots; |
| 75 | static struct wf_control *cpufreq_clamp; |
| 76 | |
| 77 | /* Set to kick the control loop into life */ |
| 78 | static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started; |
| 79 | |
| 80 | /* Failure handling.. could be nicer */ |
| 81 | #define FAILURE_FAN 0x01 |
| 82 | #define FAILURE_SENSOR 0x02 |
| 83 | #define FAILURE_OVERTEMP 0x04 |
| 84 | |
| 85 | static unsigned int wf_smu_failure_state; |
| 86 | static int wf_smu_readjust, wf_smu_skipping; |
| 87 | |
| 88 | /* |
| 89 | * ****** CPU Fans Control Loop ****** |
| 90 | * |
| 91 | */ |
| 92 | |
| 93 | |
| 94 | #define WF_SMU_CPU_FANS_INTERVAL 1 |
| 95 | #define WF_SMU_CPU_FANS_MAX_HISTORY 16 |
| 96 | |
| 97 | /* State data used by the cpu fans control loop |
| 98 | */ |
| 99 | struct wf_smu_cpu_fans_state { |
| 100 | int ticks; |
| 101 | s32 cpu_setpoint; |
| 102 | struct wf_cpu_pid_state pid; |
| 103 | }; |
| 104 | |
| 105 | static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; |
| 106 | |
| 107 | |
| 108 | |
| 109 | /* |
| 110 | * ****** Drive Fan Control Loop ****** |
| 111 | * |
| 112 | */ |
| 113 | |
| 114 | struct wf_smu_drive_fans_state { |
| 115 | int ticks; |
| 116 | s32 setpoint; |
| 117 | struct wf_pid_state pid; |
| 118 | }; |
| 119 | |
| 120 | static struct wf_smu_drive_fans_state *wf_smu_drive_fans; |
| 121 | |
| 122 | /* |
| 123 | * ****** Slots Fan Control Loop ****** |
| 124 | * |
| 125 | */ |
| 126 | |
| 127 | struct wf_smu_slots_fans_state { |
| 128 | int ticks; |
| 129 | s32 setpoint; |
| 130 | struct wf_pid_state pid; |
| 131 | }; |
| 132 | |
| 133 | static struct wf_smu_slots_fans_state *wf_smu_slots_fans; |
| 134 | |
| 135 | /* |
| 136 | * ***** Implementation ***** |
| 137 | * |
| 138 | */ |
| 139 | |
| 140 | |
| 141 | static void wf_smu_create_cpu_fans(void) |
| 142 | { |
| 143 | struct wf_cpu_pid_param pid_param; |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 144 | const struct smu_sdbp_header *hdr; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 145 | struct smu_sdbp_cpupiddata *piddata; |
| 146 | struct smu_sdbp_fvt *fvt; |
| 147 | s32 tmax, tdelta, maxpow, powadj; |
| 148 | |
| 149 | /* First, locate the PID params in SMU SBD */ |
| 150 | hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); |
| 151 | if (hdr == 0) { |
| 152 | printk(KERN_WARNING "windfarm: CPU PID fan config not found " |
| 153 | "max fan speed\n"); |
| 154 | goto fail; |
| 155 | } |
| 156 | piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; |
| 157 | |
| 158 | /* Get the FVT params for operating point 0 (the only supported one |
| 159 | * for now) in order to get tmax |
| 160 | */ |
| 161 | hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); |
| 162 | if (hdr) { |
| 163 | fvt = (struct smu_sdbp_fvt *)&hdr[1]; |
| 164 | tmax = ((s32)fvt->maxtemp) << 16; |
| 165 | } else |
| 166 | tmax = 0x5e0000; /* 94 degree default */ |
| 167 | |
| 168 | /* Alloc & initialize state */ |
| 169 | wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), |
| 170 | GFP_KERNEL); |
| 171 | if (wf_smu_cpu_fans == NULL) |
| 172 | goto fail; |
| 173 | wf_smu_cpu_fans->ticks = 1; |
| 174 | |
| 175 | /* Fill PID params */ |
| 176 | pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; |
| 177 | pid_param.history_len = piddata->history_len; |
| 178 | if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { |
| 179 | printk(KERN_WARNING "windfarm: History size overflow on " |
| 180 | "CPU control loop (%d)\n", piddata->history_len); |
| 181 | pid_param.history_len = WF_CPU_PID_MAX_HISTORY; |
| 182 | } |
| 183 | pid_param.gd = piddata->gd; |
| 184 | pid_param.gp = piddata->gp; |
| 185 | pid_param.gr = piddata->gr / pid_param.history_len; |
| 186 | |
| 187 | tdelta = ((s32)piddata->target_temp_delta) << 16; |
| 188 | maxpow = ((s32)piddata->max_power) << 16; |
| 189 | powadj = ((s32)piddata->power_adj) << 16; |
| 190 | |
| 191 | pid_param.tmax = tmax; |
| 192 | pid_param.ttarget = tmax - tdelta; |
| 193 | pid_param.pmaxadj = maxpow - powadj; |
| 194 | |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 195 | pid_param.min = wf_control_get_min(fan_cpu_main); |
| 196 | pid_param.max = wf_control_get_max(fan_cpu_main); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 197 | |
| 198 | wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); |
| 199 | |
| 200 | DBG("wf: CPU Fan control initialized.\n"); |
| 201 | DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", |
| 202 | FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), |
| 203 | pid_param.min, pid_param.max); |
| 204 | |
| 205 | return; |
| 206 | |
| 207 | fail: |
| 208 | printk(KERN_WARNING "windfarm: CPU fan config not found\n" |
| 209 | "for this machine model, max fan speed\n"); |
| 210 | |
| 211 | if (cpufreq_clamp) |
| 212 | wf_control_set_max(cpufreq_clamp); |
| 213 | if (fan_cpu_main) |
| 214 | wf_control_set_max(fan_cpu_main); |
| 215 | } |
| 216 | |
| 217 | static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) |
| 218 | { |
| 219 | s32 new_setpoint, temp, power; |
| 220 | int rc; |
| 221 | |
| 222 | if (--st->ticks != 0) { |
| 223 | if (wf_smu_readjust) |
| 224 | goto readjust; |
| 225 | return; |
| 226 | } |
| 227 | st->ticks = WF_SMU_CPU_FANS_INTERVAL; |
| 228 | |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 229 | rc = wf_sensor_get(sensor_cpu_temp, &temp); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 230 | if (rc) { |
| 231 | printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", |
| 232 | rc); |
| 233 | wf_smu_failure_state |= FAILURE_SENSOR; |
| 234 | return; |
| 235 | } |
| 236 | |
Stephen Rothwell | ca7d593 | 2012-05-02 18:34:52 +0000 | [diff] [blame] | 237 | rc = wf_sensor_get(sensor_cpu_power, &power); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 238 | if (rc) { |
| 239 | printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", |
| 240 | rc); |
| 241 | wf_smu_failure_state |= FAILURE_SENSOR; |
| 242 | return; |
| 243 | } |
| 244 | |
| 245 | DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", |
| 246 | FIX32TOPRINT(temp), FIX32TOPRINT(power)); |
| 247 | |
| 248 | #ifdef HACKED_OVERTEMP |
| 249 | if (temp > 0x4a0000) |
| 250 | wf_smu_failure_state |= FAILURE_OVERTEMP; |
| 251 | #else |
| 252 | if (temp > st->pid.param.tmax) |
| 253 | wf_smu_failure_state |= FAILURE_OVERTEMP; |
| 254 | #endif |
| 255 | new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); |
| 256 | |
| 257 | DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); |
| 258 | |
| 259 | if (st->cpu_setpoint == new_setpoint) |
| 260 | return; |
| 261 | st->cpu_setpoint = new_setpoint; |
| 262 | readjust: |
| 263 | if (fan_cpu_main && wf_smu_failure_state == 0) { |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 264 | rc = wf_control_set(fan_cpu_main, st->cpu_setpoint); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 265 | if (rc) { |
| 266 | printk(KERN_WARNING "windfarm: CPU main fan" |
| 267 | " error %d\n", rc); |
| 268 | wf_smu_failure_state |= FAILURE_FAN; |
| 269 | } |
| 270 | } |
| 271 | if (fan_cpu_second && wf_smu_failure_state == 0) { |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 272 | rc = wf_control_set(fan_cpu_second, st->cpu_setpoint); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 273 | if (rc) { |
| 274 | printk(KERN_WARNING "windfarm: CPU second fan" |
| 275 | " error %d\n", rc); |
| 276 | wf_smu_failure_state |= FAILURE_FAN; |
| 277 | } |
| 278 | } |
| 279 | if (fan_cpu_third && wf_smu_failure_state == 0) { |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 280 | rc = wf_control_set(fan_cpu_third, st->cpu_setpoint); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 281 | if (rc) { |
| 282 | printk(KERN_WARNING "windfarm: CPU third fan" |
| 283 | " error %d\n", rc); |
| 284 | wf_smu_failure_state |= FAILURE_FAN; |
| 285 | } |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | static void wf_smu_create_drive_fans(void) |
| 290 | { |
| 291 | struct wf_pid_param param = { |
| 292 | .interval = 5, |
| 293 | .history_len = 2, |
| 294 | .gd = 0x01e00000, |
| 295 | .gp = 0x00500000, |
| 296 | .gr = 0x00000000, |
| 297 | .itarget = 0x00200000, |
| 298 | }; |
| 299 | |
| 300 | /* Alloc & initialize state */ |
| 301 | wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state), |
| 302 | GFP_KERNEL); |
| 303 | if (wf_smu_drive_fans == NULL) { |
| 304 | printk(KERN_WARNING "windfarm: Memory allocation error" |
| 305 | " max fan speed\n"); |
| 306 | goto fail; |
| 307 | } |
| 308 | wf_smu_drive_fans->ticks = 1; |
| 309 | |
| 310 | /* Fill PID params */ |
| 311 | param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN); |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 312 | param.min = wf_control_get_min(fan_hd); |
| 313 | param.max = wf_control_get_max(fan_hd); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 314 | wf_pid_init(&wf_smu_drive_fans->pid, ¶m); |
| 315 | |
| 316 | DBG("wf: Drive Fan control initialized.\n"); |
| 317 | DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", |
| 318 | FIX32TOPRINT(param.itarget), param.min, param.max); |
| 319 | return; |
| 320 | |
| 321 | fail: |
| 322 | if (fan_hd) |
| 323 | wf_control_set_max(fan_hd); |
| 324 | } |
| 325 | |
| 326 | static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st) |
| 327 | { |
| 328 | s32 new_setpoint, temp; |
| 329 | int rc; |
| 330 | |
| 331 | if (--st->ticks != 0) { |
| 332 | if (wf_smu_readjust) |
| 333 | goto readjust; |
| 334 | return; |
| 335 | } |
| 336 | st->ticks = st->pid.param.interval; |
| 337 | |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 338 | rc = wf_sensor_get(sensor_hd_temp, &temp); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 339 | if (rc) { |
| 340 | printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", |
| 341 | rc); |
| 342 | wf_smu_failure_state |= FAILURE_SENSOR; |
| 343 | return; |
| 344 | } |
| 345 | |
| 346 | DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n", |
| 347 | FIX32TOPRINT(temp)); |
| 348 | |
| 349 | if (temp > (st->pid.param.itarget + 0x50000)) |
| 350 | wf_smu_failure_state |= FAILURE_OVERTEMP; |
| 351 | |
| 352 | new_setpoint = wf_pid_run(&st->pid, temp); |
| 353 | |
| 354 | DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); |
| 355 | |
| 356 | if (st->setpoint == new_setpoint) |
| 357 | return; |
| 358 | st->setpoint = new_setpoint; |
| 359 | readjust: |
| 360 | if (fan_hd && wf_smu_failure_state == 0) { |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 361 | rc = wf_control_set(fan_hd, st->setpoint); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 362 | if (rc) { |
| 363 | printk(KERN_WARNING "windfarm: HD fan error %d\n", |
| 364 | rc); |
| 365 | wf_smu_failure_state |= FAILURE_FAN; |
| 366 | } |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | static void wf_smu_create_slots_fans(void) |
| 371 | { |
| 372 | struct wf_pid_param param = { |
| 373 | .interval = 1, |
| 374 | .history_len = 8, |
| 375 | .gd = 0x00000000, |
| 376 | .gp = 0x00000000, |
| 377 | .gr = 0x00020000, |
| 378 | .itarget = 0x00000000 |
| 379 | }; |
| 380 | |
| 381 | /* Alloc & initialize state */ |
| 382 | wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state), |
| 383 | GFP_KERNEL); |
| 384 | if (wf_smu_slots_fans == NULL) { |
| 385 | printk(KERN_WARNING "windfarm: Memory allocation error" |
| 386 | " max fan speed\n"); |
| 387 | goto fail; |
| 388 | } |
| 389 | wf_smu_slots_fans->ticks = 1; |
| 390 | |
| 391 | /* Fill PID params */ |
| 392 | param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN); |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 393 | param.min = wf_control_get_min(fan_slots); |
| 394 | param.max = wf_control_get_max(fan_slots); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 395 | wf_pid_init(&wf_smu_slots_fans->pid, ¶m); |
| 396 | |
| 397 | DBG("wf: Slots Fan control initialized.\n"); |
| 398 | DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", |
| 399 | FIX32TOPRINT(param.itarget), param.min, param.max); |
| 400 | return; |
| 401 | |
| 402 | fail: |
| 403 | if (fan_slots) |
| 404 | wf_control_set_max(fan_slots); |
| 405 | } |
| 406 | |
| 407 | static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st) |
| 408 | { |
| 409 | s32 new_setpoint, power; |
| 410 | int rc; |
| 411 | |
| 412 | if (--st->ticks != 0) { |
| 413 | if (wf_smu_readjust) |
| 414 | goto readjust; |
| 415 | return; |
| 416 | } |
| 417 | st->ticks = st->pid.param.interval; |
| 418 | |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 419 | rc = wf_sensor_get(sensor_slots_power, &power); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 420 | if (rc) { |
| 421 | printk(KERN_WARNING "windfarm: Slots power sensor error %d\n", |
| 422 | rc); |
| 423 | wf_smu_failure_state |= FAILURE_SENSOR; |
| 424 | return; |
| 425 | } |
| 426 | |
| 427 | DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n", |
| 428 | FIX32TOPRINT(power)); |
| 429 | |
| 430 | #if 0 /* Check what makes a good overtemp condition */ |
| 431 | if (power > (st->pid.param.itarget + 0x50000)) |
| 432 | wf_smu_failure_state |= FAILURE_OVERTEMP; |
| 433 | #endif |
| 434 | |
| 435 | new_setpoint = wf_pid_run(&st->pid, power); |
| 436 | |
| 437 | DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); |
| 438 | |
| 439 | if (st->setpoint == new_setpoint) |
| 440 | return; |
| 441 | st->setpoint = new_setpoint; |
| 442 | readjust: |
| 443 | if (fan_slots && wf_smu_failure_state == 0) { |
Benjamin Herrenschmidt | 33e6820 | 2012-04-18 22:16:51 +0000 | [diff] [blame] | 444 | rc = wf_control_set(fan_slots, st->setpoint); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 445 | if (rc) { |
| 446 | printk(KERN_WARNING "windfarm: Slots fan error %d\n", |
| 447 | rc); |
| 448 | wf_smu_failure_state |= FAILURE_FAN; |
| 449 | } |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | |
| 454 | /* |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 455 | * ****** Setup / Init / Misc ... ****** |
| 456 | * |
| 457 | */ |
| 458 | |
| 459 | static void wf_smu_tick(void) |
| 460 | { |
| 461 | unsigned int last_failure = wf_smu_failure_state; |
| 462 | unsigned int new_failure; |
| 463 | |
| 464 | if (!wf_smu_started) { |
| 465 | DBG("wf: creating control loops !\n"); |
| 466 | wf_smu_create_drive_fans(); |
| 467 | wf_smu_create_slots_fans(); |
| 468 | wf_smu_create_cpu_fans(); |
| 469 | wf_smu_started = 1; |
| 470 | } |
| 471 | |
| 472 | /* Skipping ticks */ |
| 473 | if (wf_smu_skipping && --wf_smu_skipping) |
| 474 | return; |
| 475 | |
| 476 | wf_smu_failure_state = 0; |
| 477 | if (wf_smu_drive_fans) |
| 478 | wf_smu_drive_fans_tick(wf_smu_drive_fans); |
| 479 | if (wf_smu_slots_fans) |
| 480 | wf_smu_slots_fans_tick(wf_smu_slots_fans); |
| 481 | if (wf_smu_cpu_fans) |
| 482 | wf_smu_cpu_fans_tick(wf_smu_cpu_fans); |
| 483 | |
| 484 | wf_smu_readjust = 0; |
| 485 | new_failure = wf_smu_failure_state & ~last_failure; |
| 486 | |
| 487 | /* If entering failure mode, clamp cpufreq and ramp all |
| 488 | * fans to full speed. |
| 489 | */ |
| 490 | if (wf_smu_failure_state && !last_failure) { |
| 491 | if (cpufreq_clamp) |
| 492 | wf_control_set_max(cpufreq_clamp); |
| 493 | if (fan_cpu_main) |
| 494 | wf_control_set_max(fan_cpu_main); |
| 495 | if (fan_cpu_second) |
| 496 | wf_control_set_max(fan_cpu_second); |
| 497 | if (fan_cpu_third) |
| 498 | wf_control_set_max(fan_cpu_third); |
| 499 | if (fan_hd) |
| 500 | wf_control_set_max(fan_hd); |
| 501 | if (fan_slots) |
| 502 | wf_control_set_max(fan_slots); |
| 503 | } |
| 504 | |
| 505 | /* If leaving failure mode, unclamp cpufreq and readjust |
| 506 | * all fans on next iteration |
| 507 | */ |
| 508 | if (!wf_smu_failure_state && last_failure) { |
| 509 | if (cpufreq_clamp) |
| 510 | wf_control_set_min(cpufreq_clamp); |
| 511 | wf_smu_readjust = 1; |
| 512 | } |
| 513 | |
| 514 | /* Overtemp condition detected, notify and start skipping a couple |
| 515 | * ticks to let the temperature go down |
| 516 | */ |
| 517 | if (new_failure & FAILURE_OVERTEMP) { |
| 518 | wf_set_overtemp(); |
| 519 | wf_smu_skipping = 2; |
| 520 | } |
| 521 | |
| 522 | /* We only clear the overtemp condition if overtemp is cleared |
| 523 | * _and_ no other failure is present. Since a sensor error will |
| 524 | * clear the overtemp condition (can't measure temperature) at |
| 525 | * the control loop levels, but we don't want to keep it clear |
| 526 | * here in this case |
| 527 | */ |
| 528 | if (new_failure == 0 && last_failure & FAILURE_OVERTEMP) |
| 529 | wf_clear_overtemp(); |
| 530 | } |
| 531 | |
| 532 | |
| 533 | static void wf_smu_new_control(struct wf_control *ct) |
| 534 | { |
| 535 | if (wf_smu_all_controls_ok) |
| 536 | return; |
| 537 | |
| 538 | if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 539 | if (wf_get_control(ct) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 540 | fan_cpu_main = ct; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 541 | } |
| 542 | |
| 543 | if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) { |
| 544 | if (wf_get_control(ct) == 0) |
| 545 | fan_cpu_second = ct; |
| 546 | } |
| 547 | |
| 548 | if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) { |
| 549 | if (wf_get_control(ct) == 0) |
| 550 | fan_cpu_third = ct; |
| 551 | } |
| 552 | |
| 553 | if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { |
| 554 | if (wf_get_control(ct) == 0) |
| 555 | cpufreq_clamp = ct; |
| 556 | } |
| 557 | |
| 558 | if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 559 | if (wf_get_control(ct) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 560 | fan_hd = ct; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 561 | } |
| 562 | |
| 563 | if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 564 | if (wf_get_control(ct) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 565 | fan_slots = ct; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 566 | } |
| 567 | |
| 568 | if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd && |
| 569 | fan_slots && cpufreq_clamp) |
| 570 | wf_smu_all_controls_ok = 1; |
| 571 | } |
| 572 | |
| 573 | static void wf_smu_new_sensor(struct wf_sensor *sr) |
| 574 | { |
| 575 | if (wf_smu_all_sensors_ok) |
| 576 | return; |
| 577 | |
| 578 | if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 579 | if (wf_get_sensor(sr) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 580 | sensor_cpu_power = sr; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 581 | } |
| 582 | |
| 583 | if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 584 | if (wf_get_sensor(sr) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 585 | sensor_cpu_temp = sr; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 589 | if (wf_get_sensor(sr) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 590 | sensor_hd_temp = sr; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 591 | } |
| 592 | |
| 593 | if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) { |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 594 | if (wf_get_sensor(sr) == 0) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 595 | sensor_slots_power = sr; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 596 | } |
| 597 | |
| 598 | if (sensor_cpu_power && sensor_cpu_temp && |
| 599 | sensor_hd_temp && sensor_slots_power) |
| 600 | wf_smu_all_sensors_ok = 1; |
| 601 | } |
| 602 | |
| 603 | |
| 604 | static int wf_smu_notify(struct notifier_block *self, |
| 605 | unsigned long event, void *data) |
| 606 | { |
| 607 | switch(event) { |
| 608 | case WF_EVENT_NEW_CONTROL: |
| 609 | DBG("wf: new control %s detected\n", |
| 610 | ((struct wf_control *)data)->name); |
| 611 | wf_smu_new_control(data); |
| 612 | wf_smu_readjust = 1; |
| 613 | break; |
| 614 | case WF_EVENT_NEW_SENSOR: |
| 615 | DBG("wf: new sensor %s detected\n", |
| 616 | ((struct wf_sensor *)data)->name); |
| 617 | wf_smu_new_sensor(data); |
| 618 | break; |
| 619 | case WF_EVENT_TICK: |
| 620 | if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) |
| 621 | wf_smu_tick(); |
| 622 | } |
| 623 | |
| 624 | return 0; |
| 625 | } |
| 626 | |
| 627 | static struct notifier_block wf_smu_events = { |
| 628 | .notifier_call = wf_smu_notify, |
| 629 | }; |
| 630 | |
| 631 | static int wf_init_pm(void) |
| 632 | { |
| 633 | printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n"); |
| 634 | |
| 635 | return 0; |
| 636 | } |
| 637 | |
Benjamin Herrenschmidt | 1027061 | 2006-10-10 11:47:31 +1000 | [diff] [blame] | 638 | static int wf_smu_probe(struct platform_device *ddev) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 639 | { |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 640 | wf_register_client(&wf_smu_events); |
| 641 | |
| 642 | return 0; |
| 643 | } |
| 644 | |
Benjamin Herrenschmidt | 1027061 | 2006-10-10 11:47:31 +1000 | [diff] [blame] | 645 | static int __devexit wf_smu_remove(struct platform_device *ddev) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 646 | { |
| 647 | wf_unregister_client(&wf_smu_events); |
| 648 | |
| 649 | /* XXX We don't have yet a guarantee that our callback isn't |
| 650 | * in progress when returning from wf_unregister_client, so |
| 651 | * we add an arbitrary delay. I'll have to fix that in the core |
| 652 | */ |
| 653 | msleep(1000); |
| 654 | |
| 655 | /* Release all sensors */ |
| 656 | /* One more crappy race: I don't think we have any guarantee here |
| 657 | * that the attribute callback won't race with the sensor beeing |
| 658 | * disposed of, and I'm not 100% certain what best way to deal |
| 659 | * with that except by adding locks all over... I'll do that |
| 660 | * eventually but heh, who ever rmmod this module anyway ? |
| 661 | */ |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 662 | if (sensor_cpu_power) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 663 | wf_put_sensor(sensor_cpu_power); |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 664 | if (sensor_cpu_temp) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 665 | wf_put_sensor(sensor_cpu_temp); |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 666 | if (sensor_hd_temp) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 667 | wf_put_sensor(sensor_hd_temp); |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 668 | if (sensor_slots_power) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 669 | wf_put_sensor(sensor_slots_power); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 670 | |
| 671 | /* Release all controls */ |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 672 | if (fan_cpu_main) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 673 | wf_put_control(fan_cpu_main); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 674 | if (fan_cpu_second) |
| 675 | wf_put_control(fan_cpu_second); |
| 676 | if (fan_cpu_third) |
| 677 | wf_put_control(fan_cpu_third); |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 678 | if (fan_hd) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 679 | wf_put_control(fan_hd); |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 680 | if (fan_slots) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 681 | wf_put_control(fan_slots); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 682 | if (cpufreq_clamp) |
| 683 | wf_put_control(cpufreq_clamp); |
| 684 | |
| 685 | /* Destroy control loops state structures */ |
Julia Lawall | ab30f78 | 2010-03-28 23:39:22 +0000 | [diff] [blame] | 686 | kfree(wf_smu_slots_fans); |
| 687 | kfree(wf_smu_drive_fans); |
| 688 | kfree(wf_smu_cpu_fans); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 689 | |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 690 | return 0; |
| 691 | } |
| 692 | |
Benjamin Herrenschmidt | 1027061 | 2006-10-10 11:47:31 +1000 | [diff] [blame] | 693 | static struct platform_driver wf_smu_driver = { |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 694 | .probe = wf_smu_probe, |
Benjamin Herrenschmidt | 1027061 | 2006-10-10 11:47:31 +1000 | [diff] [blame] | 695 | .remove = __devexit_p(wf_smu_remove), |
| 696 | .driver = { |
| 697 | .name = "windfarm", |
Kay Sievers | 23386fe | 2008-04-18 13:33:53 -0700 | [diff] [blame] | 698 | .owner = THIS_MODULE, |
Benjamin Herrenschmidt | 1027061 | 2006-10-10 11:47:31 +1000 | [diff] [blame] | 699 | }, |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 700 | }; |
| 701 | |
| 702 | |
| 703 | static int __init wf_smu_init(void) |
| 704 | { |
| 705 | int rc = -ENODEV; |
| 706 | |
Grant Likely | 71a157e | 2010-02-01 21:34:14 -0700 | [diff] [blame] | 707 | if (of_machine_is_compatible("PowerMac9,1")) |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 708 | rc = wf_init_pm(); |
| 709 | |
| 710 | if (rc == 0) { |
| 711 | #ifdef MODULE |
| 712 | request_module("windfarm_smu_controls"); |
| 713 | request_module("windfarm_smu_sensors"); |
| 714 | request_module("windfarm_lm75_sensor"); |
Benjamin Herrenschmidt | d31e817 | 2006-11-16 14:00:57 +1100 | [diff] [blame] | 715 | request_module("windfarm_cpufreq_clamp"); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 716 | |
| 717 | #endif /* MODULE */ |
Benjamin Herrenschmidt | 1027061 | 2006-10-10 11:47:31 +1000 | [diff] [blame] | 718 | platform_driver_register(&wf_smu_driver); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 719 | } |
| 720 | |
| 721 | return rc; |
| 722 | } |
| 723 | |
| 724 | static void __exit wf_smu_exit(void) |
| 725 | { |
| 726 | |
Benjamin Herrenschmidt | 1027061 | 2006-10-10 11:47:31 +1000 | [diff] [blame] | 727 | platform_driver_unregister(&wf_smu_driver); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 728 | } |
| 729 | |
| 730 | |
| 731 | module_init(wf_smu_init); |
| 732 | module_exit(wf_smu_exit); |
| 733 | |
| 734 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); |
| 735 | MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1"); |
| 736 | MODULE_LICENSE("GPL"); |
| 737 | |
Kay Sievers | 23386fe | 2008-04-18 13:33:53 -0700 | [diff] [blame] | 738 | MODULE_ALIAS("platform:windfarm"); |