Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Windfarm PowerMac thermal control. SMU based sensors |
| 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 | |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/delay.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/wait.h> |
| 17 | #include <asm/prom.h> |
| 18 | #include <asm/machdep.h> |
| 19 | #include <asm/io.h> |
| 20 | #include <asm/system.h> |
| 21 | #include <asm/sections.h> |
| 22 | #include <asm/smu.h> |
| 23 | |
| 24 | #include "windfarm.h" |
| 25 | |
| 26 | #define VERSION "0.2" |
| 27 | |
| 28 | #undef DEBUG |
| 29 | |
| 30 | #ifdef DEBUG |
| 31 | #define DBG(args...) printk(args) |
| 32 | #else |
| 33 | #define DBG(args...) do { } while(0) |
| 34 | #endif |
| 35 | |
| 36 | /* |
| 37 | * Various SMU "partitions" calibration objects for which we |
| 38 | * keep pointers here for use by bits & pieces of the driver |
| 39 | */ |
| 40 | static struct smu_sdbp_cpuvcp *cpuvcp; |
| 41 | static int cpuvcp_version; |
| 42 | static struct smu_sdbp_cpudiode *cpudiode; |
| 43 | static struct smu_sdbp_slotspow *slotspow; |
| 44 | static u8 *debugswitches; |
| 45 | |
| 46 | /* |
| 47 | * SMU basic sensors objects |
| 48 | */ |
| 49 | |
| 50 | static LIST_HEAD(smu_ads); |
| 51 | |
| 52 | struct smu_ad_sensor { |
| 53 | struct list_head link; |
| 54 | u32 reg; /* index in SMU */ |
| 55 | struct wf_sensor sens; |
| 56 | }; |
| 57 | #define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens) |
| 58 | |
| 59 | static void smu_ads_release(struct wf_sensor *sr) |
| 60 | { |
| 61 | struct smu_ad_sensor *ads = to_smu_ads(sr); |
| 62 | |
| 63 | kfree(ads); |
| 64 | } |
| 65 | |
| 66 | static int smu_read_adc(u8 id, s32 *value) |
| 67 | { |
| 68 | struct smu_simple_cmd cmd; |
| 69 | DECLARE_COMPLETION(comp); |
| 70 | int rc; |
| 71 | |
| 72 | rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1, |
| 73 | smu_done_complete, &comp, id); |
| 74 | if (rc) |
| 75 | return rc; |
| 76 | wait_for_completion(&comp); |
| 77 | if (cmd.cmd.status != 0) |
| 78 | return cmd.cmd.status; |
| 79 | if (cmd.cmd.reply_len != 2) { |
| 80 | printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n", |
| 81 | id, cmd.cmd.reply_len); |
| 82 | return -EIO; |
| 83 | } |
| 84 | *value = *((u16 *)cmd.buffer); |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static int smu_cputemp_get(struct wf_sensor *sr, s32 *value) |
| 89 | { |
| 90 | struct smu_ad_sensor *ads = to_smu_ads(sr); |
| 91 | int rc; |
| 92 | s32 val; |
| 93 | s64 scaled; |
| 94 | |
| 95 | rc = smu_read_adc(ads->reg, &val); |
| 96 | if (rc) { |
| 97 | printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n", |
| 98 | rc); |
| 99 | return rc; |
| 100 | } |
| 101 | |
| 102 | /* Ok, we have to scale & adjust, taking units into account */ |
| 103 | scaled = (s64)(((u64)val) * (u64)cpudiode->m_value); |
| 104 | scaled >>= 3; |
| 105 | scaled += ((s64)cpudiode->b_value) << 9; |
| 106 | *value = (s32)(scaled << 1); |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static int smu_cpuamp_get(struct wf_sensor *sr, s32 *value) |
| 112 | { |
| 113 | struct smu_ad_sensor *ads = to_smu_ads(sr); |
| 114 | s32 val, scaled; |
| 115 | int rc; |
| 116 | |
| 117 | rc = smu_read_adc(ads->reg, &val); |
| 118 | if (rc) { |
| 119 | printk(KERN_ERR "windfarm: read CPU current failed, err %d\n", |
| 120 | rc); |
| 121 | return rc; |
| 122 | } |
| 123 | |
| 124 | /* Ok, we have to scale & adjust, taking units into account */ |
| 125 | scaled = (s32)(val * (u32)cpuvcp->curr_scale); |
| 126 | scaled += (s32)cpuvcp->curr_offset; |
| 127 | *value = scaled << 4; |
| 128 | |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static int smu_cpuvolt_get(struct wf_sensor *sr, s32 *value) |
| 133 | { |
| 134 | struct smu_ad_sensor *ads = to_smu_ads(sr); |
| 135 | s32 val, scaled; |
| 136 | int rc; |
| 137 | |
| 138 | rc = smu_read_adc(ads->reg, &val); |
| 139 | if (rc) { |
| 140 | printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n", |
| 141 | rc); |
| 142 | return rc; |
| 143 | } |
| 144 | |
| 145 | /* Ok, we have to scale & adjust, taking units into account */ |
| 146 | scaled = (s32)(val * (u32)cpuvcp->volt_scale); |
| 147 | scaled += (s32)cpuvcp->volt_offset; |
| 148 | *value = scaled << 4; |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static int smu_slotspow_get(struct wf_sensor *sr, s32 *value) |
| 154 | { |
| 155 | struct smu_ad_sensor *ads = to_smu_ads(sr); |
| 156 | s32 val, scaled; |
| 157 | int rc; |
| 158 | |
| 159 | rc = smu_read_adc(ads->reg, &val); |
| 160 | if (rc) { |
| 161 | printk(KERN_ERR "windfarm: read slots power failed, err %d\n", |
| 162 | rc); |
| 163 | return rc; |
| 164 | } |
| 165 | |
| 166 | /* Ok, we have to scale & adjust, taking units into account */ |
| 167 | scaled = (s32)(val * (u32)slotspow->pow_scale); |
| 168 | scaled += (s32)slotspow->pow_offset; |
| 169 | *value = scaled << 4; |
| 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | |
| 175 | static struct wf_sensor_ops smu_cputemp_ops = { |
| 176 | .get_value = smu_cputemp_get, |
| 177 | .release = smu_ads_release, |
| 178 | .owner = THIS_MODULE, |
| 179 | }; |
| 180 | static struct wf_sensor_ops smu_cpuamp_ops = { |
| 181 | .get_value = smu_cpuamp_get, |
| 182 | .release = smu_ads_release, |
| 183 | .owner = THIS_MODULE, |
| 184 | }; |
| 185 | static struct wf_sensor_ops smu_cpuvolt_ops = { |
| 186 | .get_value = smu_cpuvolt_get, |
| 187 | .release = smu_ads_release, |
| 188 | .owner = THIS_MODULE, |
| 189 | }; |
| 190 | static struct wf_sensor_ops smu_slotspow_ops = { |
| 191 | .get_value = smu_slotspow_get, |
| 192 | .release = smu_ads_release, |
| 193 | .owner = THIS_MODULE, |
| 194 | }; |
| 195 | |
| 196 | |
| 197 | static struct smu_ad_sensor *smu_ads_create(struct device_node *node) |
| 198 | { |
| 199 | struct smu_ad_sensor *ads; |
| 200 | char *c, *l; |
| 201 | u32 *v; |
| 202 | |
| 203 | ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL); |
| 204 | if (ads == NULL) |
| 205 | return NULL; |
| 206 | c = (char *)get_property(node, "device_type", NULL); |
| 207 | l = (char *)get_property(node, "location", NULL); |
| 208 | if (c == NULL || l == NULL) |
| 209 | goto fail; |
| 210 | |
| 211 | /* We currently pick the sensors based on the OF name and location |
| 212 | * properties, while Darwin uses the sensor-id's. |
| 213 | * The problem with the IDs is that they are model specific while it |
| 214 | * looks like apple has been doing a reasonably good job at keeping |
| 215 | * the names and locations consistents so I'll stick with the names |
| 216 | * and locations for now. |
| 217 | */ |
| 218 | if (!strcmp(c, "temp-sensor") && |
| 219 | !strcmp(l, "CPU T-Diode")) { |
| 220 | ads->sens.ops = &smu_cputemp_ops; |
| 221 | ads->sens.name = "cpu-temp"; |
| 222 | } else if (!strcmp(c, "current-sensor") && |
| 223 | !strcmp(l, "CPU Current")) { |
| 224 | ads->sens.ops = &smu_cpuamp_ops; |
| 225 | ads->sens.name = "cpu-current"; |
| 226 | } else if (!strcmp(c, "voltage-sensor") && |
| 227 | !strcmp(l, "CPU Voltage")) { |
| 228 | ads->sens.ops = &smu_cpuvolt_ops; |
| 229 | ads->sens.name = "cpu-voltage"; |
| 230 | } else if (!strcmp(c, "power-sensor") && |
| 231 | !strcmp(l, "Slots Power")) { |
| 232 | ads->sens.ops = &smu_slotspow_ops; |
| 233 | ads->sens.name = "slots-power"; |
| 234 | if (slotspow == NULL) { |
| 235 | DBG("wf: slotspow partition (%02x) not found\n", |
| 236 | SMU_SDB_SLOTSPOW_ID); |
| 237 | goto fail; |
| 238 | } |
| 239 | } else |
| 240 | goto fail; |
| 241 | |
| 242 | v = (u32 *)get_property(node, "reg", NULL); |
| 243 | if (v == NULL) |
| 244 | goto fail; |
| 245 | ads->reg = *v; |
| 246 | |
| 247 | if (wf_register_sensor(&ads->sens)) |
| 248 | goto fail; |
| 249 | return ads; |
| 250 | fail: |
| 251 | kfree(ads); |
| 252 | return NULL; |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * SMU Power combo sensor object |
| 257 | */ |
| 258 | |
| 259 | struct smu_cpu_power_sensor { |
| 260 | struct list_head link; |
| 261 | struct wf_sensor *volts; |
| 262 | struct wf_sensor *amps; |
| 263 | int fake_volts : 1; |
| 264 | int quadratic : 1; |
| 265 | struct wf_sensor sens; |
| 266 | }; |
| 267 | #define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens) |
| 268 | |
| 269 | static struct smu_cpu_power_sensor *smu_cpu_power; |
| 270 | |
| 271 | static void smu_cpu_power_release(struct wf_sensor *sr) |
| 272 | { |
| 273 | struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr); |
| 274 | |
| 275 | if (pow->volts) |
| 276 | wf_put_sensor(pow->volts); |
| 277 | if (pow->amps) |
| 278 | wf_put_sensor(pow->amps); |
| 279 | kfree(pow); |
| 280 | } |
| 281 | |
| 282 | static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value) |
| 283 | { |
| 284 | struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr); |
| 285 | s32 volts, amps, power; |
| 286 | u64 tmps, tmpa, tmpb; |
| 287 | int rc; |
| 288 | |
| 289 | rc = pow->amps->ops->get_value(pow->amps, &s); |
| 290 | if (rc) |
| 291 | return rc; |
| 292 | |
| 293 | if (pow->fake_volts) { |
| 294 | *value = amps * 12 - 0x30000; |
| 295 | return 0; |
| 296 | } |
| 297 | |
| 298 | rc = pow->volts->ops->get_value(pow->volts, &volts); |
| 299 | if (rc) |
| 300 | return rc; |
| 301 | |
| 302 | power = (s32)((((u64)volts) * ((u64)amps)) >> 16); |
| 303 | if (!pow->quadratic) { |
| 304 | *value = power; |
| 305 | return 0; |
| 306 | } |
| 307 | tmps = (((u64)power) * ((u64)power)) >> 16; |
| 308 | tmpa = ((u64)cpuvcp->power_quads[0]) * tmps; |
| 309 | tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power); |
| 310 | *value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12); |
| 311 | |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | static struct wf_sensor_ops smu_cpu_power_ops = { |
| 316 | .get_value = smu_cpu_power_get, |
| 317 | .release = smu_cpu_power_release, |
| 318 | .owner = THIS_MODULE, |
| 319 | }; |
| 320 | |
| 321 | |
| 322 | static struct smu_cpu_power_sensor * |
| 323 | smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps) |
| 324 | { |
| 325 | struct smu_cpu_power_sensor *pow; |
| 326 | |
| 327 | pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL); |
| 328 | if (pow == NULL) |
| 329 | return NULL; |
| 330 | pow->sens.ops = &smu_cpu_power_ops; |
| 331 | pow->sens.name = "cpu-power"; |
| 332 | |
| 333 | wf_get_sensor(volts); |
| 334 | pow->volts = volts; |
| 335 | wf_get_sensor(amps); |
| 336 | pow->amps = amps; |
| 337 | |
| 338 | /* Some early machines need a faked voltage */ |
| 339 | if (debugswitches && ((*debugswitches) & 0x80)) { |
| 340 | printk(KERN_INFO "windfarm: CPU Power sensor using faked" |
| 341 | " voltage !\n"); |
| 342 | pow->fake_volts = 1; |
| 343 | } else |
| 344 | pow->fake_volts = 0; |
| 345 | |
| 346 | /* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now, |
| 347 | * I yet have to figure out what's up with 8,2 and will have to |
| 348 | * adjust for later, unless we can 100% trust the SDB partition... |
| 349 | */ |
| 350 | if ((machine_is_compatible("PowerMac8,1") || |
| 351 | machine_is_compatible("PowerMac8,2") || |
| 352 | machine_is_compatible("PowerMac9,1")) && |
| 353 | cpuvcp_version >= 2) { |
| 354 | pow->quadratic = 1; |
| 355 | DBG("windfarm: CPU Power using quadratic transform\n"); |
| 356 | } else |
| 357 | pow->quadratic = 0; |
| 358 | |
| 359 | if (wf_register_sensor(&pow->sens)) |
| 360 | goto fail; |
| 361 | return pow; |
| 362 | fail: |
| 363 | kfree(pow); |
| 364 | return NULL; |
| 365 | } |
| 366 | |
| 367 | static int smu_fetch_param_partitions(void) |
| 368 | { |
| 369 | struct smu_sdbp_header *hdr; |
| 370 | |
| 371 | /* Get CPU voltage/current/power calibration data */ |
| 372 | hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL); |
| 373 | if (hdr == NULL) { |
| 374 | DBG("wf: cpuvcp partition (%02x) not found\n", |
| 375 | SMU_SDB_CPUVCP_ID); |
| 376 | return -ENODEV; |
| 377 | } |
| 378 | cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1]; |
| 379 | /* Keep version around */ |
| 380 | cpuvcp_version = hdr->version; |
| 381 | |
| 382 | /* Get CPU diode calibration data */ |
| 383 | hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL); |
| 384 | if (hdr == NULL) { |
| 385 | DBG("wf: cpudiode partition (%02x) not found\n", |
| 386 | SMU_SDB_CPUDIODE_ID); |
| 387 | return -ENODEV; |
| 388 | } |
| 389 | cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1]; |
| 390 | |
| 391 | /* Get slots power calibration data if any */ |
| 392 | hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL); |
| 393 | if (hdr != NULL) |
| 394 | slotspow = (struct smu_sdbp_slotspow *)&hdr[1]; |
| 395 | |
| 396 | /* Get debug switches if any */ |
| 397 | hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL); |
| 398 | if (hdr != NULL) |
| 399 | debugswitches = (u8 *)&hdr[1]; |
| 400 | |
| 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | static int __init smu_sensors_init(void) |
| 405 | { |
| 406 | struct device_node *smu, *sensors, *s; |
| 407 | struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL; |
| 408 | int rc; |
| 409 | |
| 410 | if (!smu_present()) |
| 411 | return -ENODEV; |
| 412 | |
| 413 | /* Get parameters partitions */ |
| 414 | rc = smu_fetch_param_partitions(); |
| 415 | if (rc) |
| 416 | return rc; |
| 417 | |
| 418 | smu = of_find_node_by_type(NULL, "smu"); |
| 419 | if (smu == NULL) |
| 420 | return -ENODEV; |
| 421 | |
| 422 | /* Look for sensors subdir */ |
| 423 | for (sensors = NULL; |
| 424 | (sensors = of_get_next_child(smu, sensors)) != NULL;) |
| 425 | if (!strcmp(sensors->name, "sensors")) |
| 426 | break; |
| 427 | |
| 428 | of_node_put(smu); |
| 429 | |
| 430 | /* Create basic sensors */ |
| 431 | for (s = NULL; |
| 432 | sensors && (s = of_get_next_child(sensors, s)) != NULL;) { |
| 433 | struct smu_ad_sensor *ads; |
| 434 | |
| 435 | ads = smu_ads_create(s); |
| 436 | if (ads == NULL) |
| 437 | continue; |
| 438 | list_add(&ads->link, &smu_ads); |
| 439 | /* keep track of cpu voltage & current */ |
| 440 | if (!strcmp(ads->sens.name, "cpu-voltage")) |
| 441 | volt_sensor = ads; |
| 442 | else if (!strcmp(ads->sens.name, "cpu-current")) |
| 443 | curr_sensor = ads; |
| 444 | } |
| 445 | |
| 446 | of_node_put(sensors); |
| 447 | |
| 448 | /* Create CPU power sensor if possible */ |
| 449 | if (volt_sensor && curr_sensor) |
| 450 | smu_cpu_power = smu_cpu_power_create(&volt_sensor->sens, |
| 451 | &curr_sensor->sens); |
| 452 | |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | static void __exit smu_sensors_exit(void) |
| 457 | { |
| 458 | struct smu_ad_sensor *ads; |
| 459 | |
| 460 | /* dispose of power sensor */ |
| 461 | if (smu_cpu_power) |
| 462 | wf_unregister_sensor(&smu_cpu_power->sens); |
| 463 | |
| 464 | /* dispose of basic sensors */ |
| 465 | while (!list_empty(&smu_ads)) { |
| 466 | ads = list_entry(smu_ads.next, struct smu_ad_sensor, link); |
| 467 | list_del(&ads->link); |
| 468 | wf_unregister_sensor(&ads->sens); |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | |
| 473 | module_init(smu_sensors_init); |
| 474 | module_exit(smu_sensors_exit); |
| 475 | |
| 476 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); |
| 477 | MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control"); |
| 478 | MODULE_LICENSE("GPL"); |
| 479 | |