1 /* 2 * Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org> 3 * and Markus Demleitner <msdemlei@cl.uni-heidelberg.de> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This driver adds basic cpufreq support for SMU & 970FX based G5 Macs, 10 * that is iMac G5 and latest single CPU desktop. 11 */ 12 13 #undef DEBUG 14 15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 16 17 #include <linux/module.h> 18 #include <linux/types.h> 19 #include <linux/errno.h> 20 #include <linux/kernel.h> 21 #include <linux/delay.h> 22 #include <linux/sched.h> 23 #include <linux/cpufreq.h> 24 #include <linux/init.h> 25 #include <linux/completion.h> 26 #include <linux/mutex.h> 27 #include <linux/of_device.h> 28 #include <asm/prom.h> 29 #include <asm/machdep.h> 30 #include <asm/irq.h> 31 #include <asm/sections.h> 32 #include <asm/cputable.h> 33 #include <asm/time.h> 34 #include <asm/smu.h> 35 #include <asm/pmac_pfunc.h> 36 37 #define DBG(fmt...) pr_debug(fmt) 38 39 /* see 970FX user manual */ 40 41 #define SCOM_PCR 0x0aa001 /* PCR scom addr */ 42 43 #define PCR_HILO_SELECT 0x80000000U /* 1 = PCR, 0 = PCRH */ 44 #define PCR_SPEED_FULL 0x00000000U /* 1:1 speed value */ 45 #define PCR_SPEED_HALF 0x00020000U /* 1:2 speed value */ 46 #define PCR_SPEED_QUARTER 0x00040000U /* 1:4 speed value */ 47 #define PCR_SPEED_MASK 0x000e0000U /* speed mask */ 48 #define PCR_SPEED_SHIFT 17 49 #define PCR_FREQ_REQ_VALID 0x00010000U /* freq request valid */ 50 #define PCR_VOLT_REQ_VALID 0x00008000U /* volt request valid */ 51 #define PCR_TARGET_TIME_MASK 0x00006000U /* target time */ 52 #define PCR_STATLAT_MASK 0x00001f00U /* STATLAT value */ 53 #define PCR_SNOOPLAT_MASK 0x000000f0U /* SNOOPLAT value */ 54 #define PCR_SNOOPACC_MASK 0x0000000fU /* SNOOPACC value */ 55 56 #define SCOM_PSR 0x408001 /* PSR scom addr */ 57 /* warning: PSR is a 64 bits register */ 58 #define PSR_CMD_RECEIVED 0x2000000000000000U /* command received */ 59 #define PSR_CMD_COMPLETED 0x1000000000000000U /* command completed */ 60 #define PSR_CUR_SPEED_MASK 0x0300000000000000U /* current speed */ 61 #define PSR_CUR_SPEED_SHIFT (56) 62 63 /* 64 * The G5 only supports two frequencies (Quarter speed is not supported) 65 */ 66 #define CPUFREQ_HIGH 0 67 #define CPUFREQ_LOW 1 68 69 static struct cpufreq_frequency_table g5_cpu_freqs[] = { 70 {0, CPUFREQ_HIGH, 0}, 71 {0, CPUFREQ_LOW, 0}, 72 {0, 0, CPUFREQ_TABLE_END}, 73 }; 74 75 /* Power mode data is an array of the 32 bits PCR values to use for 76 * the various frequencies, retrieved from the device-tree 77 */ 78 static int g5_pmode_cur; 79 80 static void (*g5_switch_volt)(int speed_mode); 81 static int (*g5_switch_freq)(int speed_mode); 82 static int (*g5_query_freq)(void); 83 84 static unsigned long transition_latency; 85 86 #ifdef CONFIG_PMAC_SMU 87 88 static const u32 *g5_pmode_data; 89 static int g5_pmode_max; 90 91 static struct smu_sdbp_fvt *g5_fvt_table; /* table of op. points */ 92 static int g5_fvt_count; /* number of op. points */ 93 static int g5_fvt_cur; /* current op. point */ 94 95 /* 96 * SMU based voltage switching for Neo2 platforms 97 */ 98 99 static void g5_smu_switch_volt(int speed_mode) 100 { 101 struct smu_simple_cmd cmd; 102 103 DECLARE_COMPLETION_ONSTACK(comp); 104 smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, smu_done_complete, 105 &comp, 'V', 'S', 'L', 'E', 'W', 106 0xff, g5_fvt_cur+1, speed_mode); 107 wait_for_completion(&comp); 108 } 109 110 /* 111 * Platform function based voltage/vdnap switching for Neo2 112 */ 113 114 static struct pmf_function *pfunc_set_vdnap0; 115 static struct pmf_function *pfunc_vdnap0_complete; 116 117 static void g5_vdnap_switch_volt(int speed_mode) 118 { 119 struct pmf_args args; 120 u32 slew, done = 0; 121 unsigned long timeout; 122 123 slew = (speed_mode == CPUFREQ_LOW) ? 1 : 0; 124 args.count = 1; 125 args.u[0].p = &slew; 126 127 pmf_call_one(pfunc_set_vdnap0, &args); 128 129 /* It's an irq GPIO so we should be able to just block here, 130 * I'll do that later after I've properly tested the IRQ code for 131 * platform functions 132 */ 133 timeout = jiffies + HZ/10; 134 while(!time_after(jiffies, timeout)) { 135 args.count = 1; 136 args.u[0].p = &done; 137 pmf_call_one(pfunc_vdnap0_complete, &args); 138 if (done) 139 break; 140 usleep_range(1000, 1000); 141 } 142 if (done == 0) 143 pr_warn("Timeout in clock slewing !\n"); 144 } 145 146 147 /* 148 * SCOM based frequency switching for 970FX rev3 149 */ 150 static int g5_scom_switch_freq(int speed_mode) 151 { 152 unsigned long flags; 153 int to; 154 155 /* If frequency is going up, first ramp up the voltage */ 156 if (speed_mode < g5_pmode_cur) 157 g5_switch_volt(speed_mode); 158 159 local_irq_save(flags); 160 161 /* Clear PCR high */ 162 scom970_write(SCOM_PCR, 0); 163 /* Clear PCR low */ 164 scom970_write(SCOM_PCR, PCR_HILO_SELECT | 0); 165 /* Set PCR low */ 166 scom970_write(SCOM_PCR, PCR_HILO_SELECT | 167 g5_pmode_data[speed_mode]); 168 169 /* Wait for completion */ 170 for (to = 0; to < 10; to++) { 171 unsigned long psr = scom970_read(SCOM_PSR); 172 173 if ((psr & PSR_CMD_RECEIVED) == 0 && 174 (((psr >> PSR_CUR_SPEED_SHIFT) ^ 175 (g5_pmode_data[speed_mode] >> PCR_SPEED_SHIFT)) & 0x3) 176 == 0) 177 break; 178 if (psr & PSR_CMD_COMPLETED) 179 break; 180 udelay(100); 181 } 182 183 local_irq_restore(flags); 184 185 /* If frequency is going down, last ramp the voltage */ 186 if (speed_mode > g5_pmode_cur) 187 g5_switch_volt(speed_mode); 188 189 g5_pmode_cur = speed_mode; 190 ppc_proc_freq = g5_cpu_freqs[speed_mode].frequency * 1000ul; 191 192 return 0; 193 } 194 195 static int g5_scom_query_freq(void) 196 { 197 unsigned long psr = scom970_read(SCOM_PSR); 198 int i; 199 200 for (i = 0; i <= g5_pmode_max; i++) 201 if ((((psr >> PSR_CUR_SPEED_SHIFT) ^ 202 (g5_pmode_data[i] >> PCR_SPEED_SHIFT)) & 0x3) == 0) 203 break; 204 return i; 205 } 206 207 /* 208 * Fake voltage switching for platforms with missing support 209 */ 210 211 static void g5_dummy_switch_volt(int speed_mode) 212 { 213 } 214 215 #endif /* CONFIG_PMAC_SMU */ 216 217 /* 218 * Platform function based voltage switching for PowerMac7,2 & 7,3 219 */ 220 221 static struct pmf_function *pfunc_cpu0_volt_high; 222 static struct pmf_function *pfunc_cpu0_volt_low; 223 static struct pmf_function *pfunc_cpu1_volt_high; 224 static struct pmf_function *pfunc_cpu1_volt_low; 225 226 static void g5_pfunc_switch_volt(int speed_mode) 227 { 228 if (speed_mode == CPUFREQ_HIGH) { 229 if (pfunc_cpu0_volt_high) 230 pmf_call_one(pfunc_cpu0_volt_high, NULL); 231 if (pfunc_cpu1_volt_high) 232 pmf_call_one(pfunc_cpu1_volt_high, NULL); 233 } else { 234 if (pfunc_cpu0_volt_low) 235 pmf_call_one(pfunc_cpu0_volt_low, NULL); 236 if (pfunc_cpu1_volt_low) 237 pmf_call_one(pfunc_cpu1_volt_low, NULL); 238 } 239 usleep_range(10000, 10000); /* should be faster , to fix */ 240 } 241 242 /* 243 * Platform function based frequency switching for PowerMac7,2 & 7,3 244 */ 245 246 static struct pmf_function *pfunc_cpu_setfreq_high; 247 static struct pmf_function *pfunc_cpu_setfreq_low; 248 static struct pmf_function *pfunc_cpu_getfreq; 249 static struct pmf_function *pfunc_slewing_done; 250 251 static int g5_pfunc_switch_freq(int speed_mode) 252 { 253 struct pmf_args args; 254 u32 done = 0; 255 unsigned long timeout; 256 int rc; 257 258 DBG("g5_pfunc_switch_freq(%d)\n", speed_mode); 259 260 /* If frequency is going up, first ramp up the voltage */ 261 if (speed_mode < g5_pmode_cur) 262 g5_switch_volt(speed_mode); 263 264 /* Do it */ 265 if (speed_mode == CPUFREQ_HIGH) 266 rc = pmf_call_one(pfunc_cpu_setfreq_high, NULL); 267 else 268 rc = pmf_call_one(pfunc_cpu_setfreq_low, NULL); 269 270 if (rc) 271 pr_warn("pfunc switch error %d\n", rc); 272 273 /* It's an irq GPIO so we should be able to just block here, 274 * I'll do that later after I've properly tested the IRQ code for 275 * platform functions 276 */ 277 timeout = jiffies + HZ/10; 278 while(!time_after(jiffies, timeout)) { 279 args.count = 1; 280 args.u[0].p = &done; 281 pmf_call_one(pfunc_slewing_done, &args); 282 if (done) 283 break; 284 usleep_range(500, 500); 285 } 286 if (done == 0) 287 pr_warn("Timeout in clock slewing !\n"); 288 289 /* If frequency is going down, last ramp the voltage */ 290 if (speed_mode > g5_pmode_cur) 291 g5_switch_volt(speed_mode); 292 293 g5_pmode_cur = speed_mode; 294 ppc_proc_freq = g5_cpu_freqs[speed_mode].frequency * 1000ul; 295 296 return 0; 297 } 298 299 static int g5_pfunc_query_freq(void) 300 { 301 struct pmf_args args; 302 u32 val = 0; 303 304 args.count = 1; 305 args.u[0].p = &val; 306 pmf_call_one(pfunc_cpu_getfreq, &args); 307 return val ? CPUFREQ_HIGH : CPUFREQ_LOW; 308 } 309 310 311 /* 312 * Common interface to the cpufreq core 313 */ 314 315 static int g5_cpufreq_target(struct cpufreq_policy *policy, unsigned int index) 316 { 317 return g5_switch_freq(index); 318 } 319 320 static unsigned int g5_cpufreq_get_speed(unsigned int cpu) 321 { 322 return g5_cpu_freqs[g5_pmode_cur].frequency; 323 } 324 325 static int g5_cpufreq_cpu_init(struct cpufreq_policy *policy) 326 { 327 return cpufreq_generic_init(policy, g5_cpu_freqs, transition_latency); 328 } 329 330 static struct cpufreq_driver g5_cpufreq_driver = { 331 .name = "powermac", 332 .flags = CPUFREQ_CONST_LOOPS, 333 .init = g5_cpufreq_cpu_init, 334 .verify = cpufreq_generic_frequency_table_verify, 335 .target_index = g5_cpufreq_target, 336 .get = g5_cpufreq_get_speed, 337 .attr = cpufreq_generic_attr, 338 }; 339 340 341 #ifdef CONFIG_PMAC_SMU 342 343 static int __init g5_neo2_cpufreq_init(struct device_node *cpunode) 344 { 345 unsigned int psize, ssize; 346 unsigned long max_freq; 347 char *freq_method, *volt_method; 348 const u32 *valp; 349 u32 pvr_hi; 350 int use_volts_vdnap = 0; 351 int use_volts_smu = 0; 352 int rc = -ENODEV; 353 354 /* Check supported platforms */ 355 if (of_machine_is_compatible("PowerMac8,1") || 356 of_machine_is_compatible("PowerMac8,2") || 357 of_machine_is_compatible("PowerMac9,1") || 358 of_machine_is_compatible("PowerMac12,1")) 359 use_volts_smu = 1; 360 else if (of_machine_is_compatible("PowerMac11,2")) 361 use_volts_vdnap = 1; 362 else 363 return -ENODEV; 364 365 /* Check 970FX for now */ 366 valp = of_get_property(cpunode, "cpu-version", NULL); 367 if (!valp) { 368 DBG("No cpu-version property !\n"); 369 goto bail_noprops; 370 } 371 pvr_hi = (*valp) >> 16; 372 if (pvr_hi != 0x3c && pvr_hi != 0x44) { 373 pr_err("Unsupported CPU version\n"); 374 goto bail_noprops; 375 } 376 377 /* Look for the powertune data in the device-tree */ 378 g5_pmode_data = of_get_property(cpunode, "power-mode-data",&psize); 379 if (!g5_pmode_data) { 380 DBG("No power-mode-data !\n"); 381 goto bail_noprops; 382 } 383 g5_pmode_max = psize / sizeof(u32) - 1; 384 385 if (use_volts_smu) { 386 const struct smu_sdbp_header *shdr; 387 388 /* Look for the FVT table */ 389 shdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); 390 if (!shdr) 391 goto bail_noprops; 392 g5_fvt_table = (struct smu_sdbp_fvt *)&shdr[1]; 393 ssize = (shdr->len * sizeof(u32)) - sizeof(*shdr); 394 g5_fvt_count = ssize / sizeof(*g5_fvt_table); 395 g5_fvt_cur = 0; 396 397 /* Sanity checking */ 398 if (g5_fvt_count < 1 || g5_pmode_max < 1) 399 goto bail_noprops; 400 401 g5_switch_volt = g5_smu_switch_volt; 402 volt_method = "SMU"; 403 } else if (use_volts_vdnap) { 404 struct device_node *root; 405 406 root = of_find_node_by_path("/"); 407 if (root == NULL) { 408 pr_err("Can't find root of device tree\n"); 409 goto bail_noprops; 410 } 411 pfunc_set_vdnap0 = pmf_find_function(root, "set-vdnap0"); 412 pfunc_vdnap0_complete = 413 pmf_find_function(root, "slewing-done"); 414 if (pfunc_set_vdnap0 == NULL || 415 pfunc_vdnap0_complete == NULL) { 416 pr_err("Can't find required platform function\n"); 417 goto bail_noprops; 418 } 419 420 g5_switch_volt = g5_vdnap_switch_volt; 421 volt_method = "GPIO"; 422 } else { 423 g5_switch_volt = g5_dummy_switch_volt; 424 volt_method = "none"; 425 } 426 427 /* 428 * From what I see, clock-frequency is always the maximal frequency. 429 * The current driver can not slew sysclk yet, so we really only deal 430 * with powertune steps for now. We also only implement full freq and 431 * half freq in this version. So far, I haven't yet seen a machine 432 * supporting anything else. 433 */ 434 valp = of_get_property(cpunode, "clock-frequency", NULL); 435 if (!valp) 436 return -ENODEV; 437 max_freq = (*valp)/1000; 438 g5_cpu_freqs[0].frequency = max_freq; 439 g5_cpu_freqs[1].frequency = max_freq/2; 440 441 /* Set callbacks */ 442 transition_latency = 12000; 443 g5_switch_freq = g5_scom_switch_freq; 444 g5_query_freq = g5_scom_query_freq; 445 freq_method = "SCOM"; 446 447 /* Force apply current frequency to make sure everything is in 448 * sync (voltage is right for example). Firmware may leave us with 449 * a strange setting ... 450 */ 451 g5_switch_volt(CPUFREQ_HIGH); 452 msleep(10); 453 g5_pmode_cur = -1; 454 g5_switch_freq(g5_query_freq()); 455 456 pr_info("Registering G5 CPU frequency driver\n"); 457 pr_info("Frequency method: %s, Voltage method: %s\n", 458 freq_method, volt_method); 459 pr_info("Low: %d Mhz, High: %d Mhz, Cur: %d MHz\n", 460 g5_cpu_freqs[1].frequency/1000, 461 g5_cpu_freqs[0].frequency/1000, 462 g5_cpu_freqs[g5_pmode_cur].frequency/1000); 463 464 rc = cpufreq_register_driver(&g5_cpufreq_driver); 465 466 /* We keep the CPU node on hold... hopefully, Apple G5 don't have 467 * hotplug CPU with a dynamic device-tree ... 468 */ 469 return rc; 470 471 bail_noprops: 472 of_node_put(cpunode); 473 474 return rc; 475 } 476 477 #endif /* CONFIG_PMAC_SMU */ 478 479 480 static int __init g5_pm72_cpufreq_init(struct device_node *cpunode) 481 { 482 struct device_node *cpuid = NULL, *hwclock = NULL; 483 const u8 *eeprom = NULL; 484 const u32 *valp; 485 u64 max_freq, min_freq, ih, il; 486 int has_volt = 1, rc = 0; 487 488 DBG("cpufreq: Initializing for PowerMac7,2, PowerMac7,3 and" 489 " RackMac3,1...\n"); 490 491 /* Lookup the cpuid eeprom node */ 492 cpuid = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/cpuid@a0"); 493 if (cpuid != NULL) 494 eeprom = of_get_property(cpuid, "cpuid", NULL); 495 if (eeprom == NULL) { 496 pr_err("Can't find cpuid EEPROM !\n"); 497 rc = -ENODEV; 498 goto bail; 499 } 500 501 /* Lookup the i2c hwclock */ 502 for_each_node_by_name(hwclock, "i2c-hwclock") { 503 const char *loc = of_get_property(hwclock, 504 "hwctrl-location", NULL); 505 if (loc == NULL) 506 continue; 507 if (strcmp(loc, "CPU CLOCK")) 508 continue; 509 if (!of_get_property(hwclock, "platform-get-frequency", NULL)) 510 continue; 511 break; 512 } 513 if (hwclock == NULL) { 514 pr_err("Can't find i2c clock chip !\n"); 515 rc = -ENODEV; 516 goto bail; 517 } 518 519 DBG("cpufreq: i2c clock chip found: %s\n", hwclock->full_name); 520 521 /* Now get all the platform functions */ 522 pfunc_cpu_getfreq = 523 pmf_find_function(hwclock, "get-frequency"); 524 pfunc_cpu_setfreq_high = 525 pmf_find_function(hwclock, "set-frequency-high"); 526 pfunc_cpu_setfreq_low = 527 pmf_find_function(hwclock, "set-frequency-low"); 528 pfunc_slewing_done = 529 pmf_find_function(hwclock, "slewing-done"); 530 pfunc_cpu0_volt_high = 531 pmf_find_function(hwclock, "set-voltage-high-0"); 532 pfunc_cpu0_volt_low = 533 pmf_find_function(hwclock, "set-voltage-low-0"); 534 pfunc_cpu1_volt_high = 535 pmf_find_function(hwclock, "set-voltage-high-1"); 536 pfunc_cpu1_volt_low = 537 pmf_find_function(hwclock, "set-voltage-low-1"); 538 539 /* Check we have minimum requirements */ 540 if (pfunc_cpu_getfreq == NULL || pfunc_cpu_setfreq_high == NULL || 541 pfunc_cpu_setfreq_low == NULL || pfunc_slewing_done == NULL) { 542 pr_err("Can't find platform functions !\n"); 543 rc = -ENODEV; 544 goto bail; 545 } 546 547 /* Check that we have complete sets */ 548 if (pfunc_cpu0_volt_high == NULL || pfunc_cpu0_volt_low == NULL) { 549 pmf_put_function(pfunc_cpu0_volt_high); 550 pmf_put_function(pfunc_cpu0_volt_low); 551 pfunc_cpu0_volt_high = pfunc_cpu0_volt_low = NULL; 552 has_volt = 0; 553 } 554 if (!has_volt || 555 pfunc_cpu1_volt_high == NULL || pfunc_cpu1_volt_low == NULL) { 556 pmf_put_function(pfunc_cpu1_volt_high); 557 pmf_put_function(pfunc_cpu1_volt_low); 558 pfunc_cpu1_volt_high = pfunc_cpu1_volt_low = NULL; 559 } 560 561 /* Note: The device tree also contains a "platform-set-values" 562 * function for which I haven't quite figured out the usage. It 563 * might have to be called on init and/or wakeup, I'm not too sure 564 * but things seem to work fine without it so far ... 565 */ 566 567 /* Get max frequency from device-tree */ 568 valp = of_get_property(cpunode, "clock-frequency", NULL); 569 if (!valp) { 570 pr_err("Can't find CPU frequency !\n"); 571 rc = -ENODEV; 572 goto bail; 573 } 574 575 max_freq = (*valp)/1000; 576 577 /* Now calculate reduced frequency by using the cpuid input freq 578 * ratio. This requires 64 bits math unless we are willing to lose 579 * some precision 580 */ 581 ih = *((u32 *)(eeprom + 0x10)); 582 il = *((u32 *)(eeprom + 0x20)); 583 584 /* Check for machines with no useful settings */ 585 if (il == ih) { 586 pr_warn("No low frequency mode available on this model !\n"); 587 rc = -ENODEV; 588 goto bail; 589 } 590 591 min_freq = 0; 592 if (ih != 0 && il != 0) 593 min_freq = (max_freq * il) / ih; 594 595 /* Sanity check */ 596 if (min_freq >= max_freq || min_freq < 1000) { 597 pr_err("Can't calculate low frequency !\n"); 598 rc = -ENXIO; 599 goto bail; 600 } 601 g5_cpu_freqs[0].frequency = max_freq; 602 g5_cpu_freqs[1].frequency = min_freq; 603 604 /* Based on a measurement on Xserve G5, rounded up. */ 605 transition_latency = 10 * NSEC_PER_MSEC; 606 607 /* Set callbacks */ 608 g5_switch_volt = g5_pfunc_switch_volt; 609 g5_switch_freq = g5_pfunc_switch_freq; 610 g5_query_freq = g5_pfunc_query_freq; 611 612 /* Force apply current frequency to make sure everything is in 613 * sync (voltage is right for example). Firmware may leave us with 614 * a strange setting ... 615 */ 616 g5_switch_volt(CPUFREQ_HIGH); 617 msleep(10); 618 g5_pmode_cur = -1; 619 g5_switch_freq(g5_query_freq()); 620 621 pr_info("Registering G5 CPU frequency driver\n"); 622 pr_info("Frequency method: i2c/pfunc, Voltage method: %s\n", 623 has_volt ? "i2c/pfunc" : "none"); 624 pr_info("Low: %d Mhz, High: %d Mhz, Cur: %d MHz\n", 625 g5_cpu_freqs[1].frequency/1000, 626 g5_cpu_freqs[0].frequency/1000, 627 g5_cpu_freqs[g5_pmode_cur].frequency/1000); 628 629 rc = cpufreq_register_driver(&g5_cpufreq_driver); 630 bail: 631 if (rc != 0) { 632 pmf_put_function(pfunc_cpu_getfreq); 633 pmf_put_function(pfunc_cpu_setfreq_high); 634 pmf_put_function(pfunc_cpu_setfreq_low); 635 pmf_put_function(pfunc_slewing_done); 636 pmf_put_function(pfunc_cpu0_volt_high); 637 pmf_put_function(pfunc_cpu0_volt_low); 638 pmf_put_function(pfunc_cpu1_volt_high); 639 pmf_put_function(pfunc_cpu1_volt_low); 640 } 641 of_node_put(hwclock); 642 of_node_put(cpuid); 643 of_node_put(cpunode); 644 645 return rc; 646 } 647 648 static int __init g5_cpufreq_init(void) 649 { 650 struct device_node *cpunode; 651 int rc = 0; 652 653 /* Get first CPU node */ 654 cpunode = of_cpu_device_node_get(0); 655 if (cpunode == NULL) { 656 pr_err("Can't find any CPU node\n"); 657 return -ENODEV; 658 } 659 660 if (of_machine_is_compatible("PowerMac7,2") || 661 of_machine_is_compatible("PowerMac7,3") || 662 of_machine_is_compatible("RackMac3,1")) 663 rc = g5_pm72_cpufreq_init(cpunode); 664 #ifdef CONFIG_PMAC_SMU 665 else 666 rc = g5_neo2_cpufreq_init(cpunode); 667 #endif /* CONFIG_PMAC_SMU */ 668 669 return rc; 670 } 671 672 module_init(g5_cpufreq_init); 673 674 675 MODULE_LICENSE("GPL"); 676