1 /* 2 * Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org> 3 * Copyright (C) 2004 John Steele Scott <toojays@toojays.net> 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 * TODO: Need a big cleanup here. Basically, we need to have different 10 * cpufreq_driver structures for the different type of HW instead of the 11 * current mess. We also need to better deal with the detection of the 12 * type of machine. 13 * 14 */ 15 16 #include <linux/module.h> 17 #include <linux/types.h> 18 #include <linux/errno.h> 19 #include <linux/kernel.h> 20 #include <linux/delay.h> 21 #include <linux/sched.h> 22 #include <linux/adb.h> 23 #include <linux/pmu.h> 24 #include <linux/cpufreq.h> 25 #include <linux/init.h> 26 #include <linux/device.h> 27 #include <linux/hardirq.h> 28 #include <linux/of_device.h> 29 #include <asm/prom.h> 30 #include <asm/machdep.h> 31 #include <asm/irq.h> 32 #include <asm/pmac_feature.h> 33 #include <asm/mmu_context.h> 34 #include <asm/sections.h> 35 #include <asm/cputable.h> 36 #include <asm/time.h> 37 #include <asm/mpic.h> 38 #include <asm/keylargo.h> 39 #include <asm/switch_to.h> 40 41 /* WARNING !!! This will cause calibrate_delay() to be called, 42 * but this is an __init function ! So you MUST go edit 43 * init/main.c to make it non-init before enabling DEBUG_FREQ 44 */ 45 #undef DEBUG_FREQ 46 47 extern void low_choose_7447a_dfs(int dfs); 48 extern void low_choose_750fx_pll(int pll); 49 extern void low_sleep_handler(void); 50 51 /* 52 * Currently, PowerMac cpufreq supports only high & low frequencies 53 * that are set by the firmware 54 */ 55 static unsigned int low_freq; 56 static unsigned int hi_freq; 57 static unsigned int cur_freq; 58 static unsigned int sleep_freq; 59 static unsigned long transition_latency; 60 61 /* 62 * Different models uses different mechanisms to switch the frequency 63 */ 64 static int (*set_speed_proc)(int low_speed); 65 static unsigned int (*get_speed_proc)(void); 66 67 /* 68 * Some definitions used by the various speedprocs 69 */ 70 static u32 voltage_gpio; 71 static u32 frequency_gpio; 72 static u32 slew_done_gpio; 73 static int no_schedule; 74 static int has_cpu_l2lve; 75 static int is_pmu_based; 76 77 /* There are only two frequency states for each processor. Values 78 * are in kHz for the time being. 79 */ 80 #define CPUFREQ_HIGH 0 81 #define CPUFREQ_LOW 1 82 83 static struct cpufreq_frequency_table pmac_cpu_freqs[] = { 84 {CPUFREQ_HIGH, 0}, 85 {CPUFREQ_LOW, 0}, 86 {0, CPUFREQ_TABLE_END}, 87 }; 88 89 static struct freq_attr* pmac_cpu_freqs_attr[] = { 90 &cpufreq_freq_attr_scaling_available_freqs, 91 NULL, 92 }; 93 94 static inline void local_delay(unsigned long ms) 95 { 96 if (no_schedule) 97 mdelay(ms); 98 else 99 msleep(ms); 100 } 101 102 #ifdef DEBUG_FREQ 103 static inline void debug_calc_bogomips(void) 104 { 105 /* This will cause a recalc of bogomips and display the 106 * result. We backup/restore the value to avoid affecting the 107 * core cpufreq framework's own calculation. 108 */ 109 unsigned long save_lpj = loops_per_jiffy; 110 calibrate_delay(); 111 loops_per_jiffy = save_lpj; 112 } 113 #endif /* DEBUG_FREQ */ 114 115 /* Switch CPU speed under 750FX CPU control 116 */ 117 static int cpu_750fx_cpu_speed(int low_speed) 118 { 119 u32 hid2; 120 121 if (low_speed == 0) { 122 /* ramping up, set voltage first */ 123 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05); 124 /* Make sure we sleep for at least 1ms */ 125 local_delay(10); 126 127 /* tweak L2 for high voltage */ 128 if (has_cpu_l2lve) { 129 hid2 = mfspr(SPRN_HID2); 130 hid2 &= ~0x2000; 131 mtspr(SPRN_HID2, hid2); 132 } 133 } 134 #ifdef CONFIG_6xx 135 low_choose_750fx_pll(low_speed); 136 #endif 137 if (low_speed == 1) { 138 /* tweak L2 for low voltage */ 139 if (has_cpu_l2lve) { 140 hid2 = mfspr(SPRN_HID2); 141 hid2 |= 0x2000; 142 mtspr(SPRN_HID2, hid2); 143 } 144 145 /* ramping down, set voltage last */ 146 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04); 147 local_delay(10); 148 } 149 150 return 0; 151 } 152 153 static unsigned int cpu_750fx_get_cpu_speed(void) 154 { 155 if (mfspr(SPRN_HID1) & HID1_PS) 156 return low_freq; 157 else 158 return hi_freq; 159 } 160 161 /* Switch CPU speed using DFS */ 162 static int dfs_set_cpu_speed(int low_speed) 163 { 164 if (low_speed == 0) { 165 /* ramping up, set voltage first */ 166 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05); 167 /* Make sure we sleep for at least 1ms */ 168 local_delay(1); 169 } 170 171 /* set frequency */ 172 #ifdef CONFIG_6xx 173 low_choose_7447a_dfs(low_speed); 174 #endif 175 udelay(100); 176 177 if (low_speed == 1) { 178 /* ramping down, set voltage last */ 179 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04); 180 local_delay(1); 181 } 182 183 return 0; 184 } 185 186 static unsigned int dfs_get_cpu_speed(void) 187 { 188 if (mfspr(SPRN_HID1) & HID1_DFS) 189 return low_freq; 190 else 191 return hi_freq; 192 } 193 194 195 /* Switch CPU speed using slewing GPIOs 196 */ 197 static int gpios_set_cpu_speed(int low_speed) 198 { 199 int gpio, timeout = 0; 200 201 /* If ramping up, set voltage first */ 202 if (low_speed == 0) { 203 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05); 204 /* Delay is way too big but it's ok, we schedule */ 205 local_delay(10); 206 } 207 208 /* Set frequency */ 209 gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0); 210 if (low_speed == ((gpio & 0x01) == 0)) 211 goto skip; 212 213 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio, 214 low_speed ? 0x04 : 0x05); 215 udelay(200); 216 do { 217 if (++timeout > 100) 218 break; 219 local_delay(1); 220 gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, slew_done_gpio, 0); 221 } while((gpio & 0x02) == 0); 222 skip: 223 /* If ramping down, set voltage last */ 224 if (low_speed == 1) { 225 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04); 226 /* Delay is way too big but it's ok, we schedule */ 227 local_delay(10); 228 } 229 230 #ifdef DEBUG_FREQ 231 debug_calc_bogomips(); 232 #endif 233 234 return 0; 235 } 236 237 /* Switch CPU speed under PMU control 238 */ 239 static int pmu_set_cpu_speed(int low_speed) 240 { 241 struct adb_request req; 242 unsigned long save_l2cr; 243 unsigned long save_l3cr; 244 unsigned int pic_prio; 245 unsigned long flags; 246 247 preempt_disable(); 248 249 #ifdef DEBUG_FREQ 250 printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1)); 251 #endif 252 pmu_suspend(); 253 254 /* Disable all interrupt sources on openpic */ 255 pic_prio = mpic_cpu_get_priority(); 256 mpic_cpu_set_priority(0xf); 257 258 /* Make sure the decrementer won't interrupt us */ 259 asm volatile("mtdec %0" : : "r" (0x7fffffff)); 260 /* Make sure any pending DEC interrupt occurring while we did 261 * the above didn't re-enable the DEC */ 262 mb(); 263 asm volatile("mtdec %0" : : "r" (0x7fffffff)); 264 265 /* We can now disable MSR_EE */ 266 local_irq_save(flags); 267 268 /* Giveup the FPU & vec */ 269 enable_kernel_fp(); 270 271 #ifdef CONFIG_ALTIVEC 272 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 273 enable_kernel_altivec(); 274 #endif /* CONFIG_ALTIVEC */ 275 276 /* Save & disable L2 and L3 caches */ 277 save_l3cr = _get_L3CR(); /* (returns -1 if not available) */ 278 save_l2cr = _get_L2CR(); /* (returns -1 if not available) */ 279 280 /* Send the new speed command. My assumption is that this command 281 * will cause PLL_CFG[0..3] to be changed next time CPU goes to sleep 282 */ 283 pmu_request(&req, NULL, 6, PMU_CPU_SPEED, 'W', 'O', 'O', 'F', low_speed); 284 while (!req.complete) 285 pmu_poll(); 286 287 /* Prepare the northbridge for the speed transition */ 288 pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,1); 289 290 /* Call low level code to backup CPU state and recover from 291 * hardware reset 292 */ 293 low_sleep_handler(); 294 295 /* Restore the northbridge */ 296 pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,0); 297 298 /* Restore L2 cache */ 299 if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0) 300 _set_L2CR(save_l2cr); 301 /* Restore L3 cache */ 302 if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0) 303 _set_L3CR(save_l3cr); 304 305 /* Restore userland MMU context */ 306 switch_mmu_context(NULL, current->active_mm); 307 308 #ifdef DEBUG_FREQ 309 printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1)); 310 #endif 311 312 /* Restore low level PMU operations */ 313 pmu_unlock(); 314 315 /* 316 * Restore decrementer; we'll take a decrementer interrupt 317 * as soon as interrupts are re-enabled and the generic 318 * clockevents code will reprogram it with the right value. 319 */ 320 set_dec(1); 321 322 /* Restore interrupts */ 323 mpic_cpu_set_priority(pic_prio); 324 325 /* Let interrupts flow again ... */ 326 local_irq_restore(flags); 327 328 #ifdef DEBUG_FREQ 329 debug_calc_bogomips(); 330 #endif 331 332 pmu_resume(); 333 334 preempt_enable(); 335 336 return 0; 337 } 338 339 static int do_set_cpu_speed(struct cpufreq_policy *policy, int speed_mode, 340 int notify) 341 { 342 struct cpufreq_freqs freqs; 343 unsigned long l3cr; 344 static unsigned long prev_l3cr; 345 346 freqs.old = cur_freq; 347 freqs.new = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq; 348 349 if (freqs.old == freqs.new) 350 return 0; 351 352 if (notify) 353 cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); 354 if (speed_mode == CPUFREQ_LOW && 355 cpu_has_feature(CPU_FTR_L3CR)) { 356 l3cr = _get_L3CR(); 357 if (l3cr & L3CR_L3E) { 358 prev_l3cr = l3cr; 359 _set_L3CR(0); 360 } 361 } 362 set_speed_proc(speed_mode == CPUFREQ_LOW); 363 if (speed_mode == CPUFREQ_HIGH && 364 cpu_has_feature(CPU_FTR_L3CR)) { 365 l3cr = _get_L3CR(); 366 if ((prev_l3cr & L3CR_L3E) && l3cr != prev_l3cr) 367 _set_L3CR(prev_l3cr); 368 } 369 if (notify) 370 cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); 371 cur_freq = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq; 372 373 return 0; 374 } 375 376 static unsigned int pmac_cpufreq_get_speed(unsigned int cpu) 377 { 378 return cur_freq; 379 } 380 381 static int pmac_cpufreq_verify(struct cpufreq_policy *policy) 382 { 383 return cpufreq_frequency_table_verify(policy, pmac_cpu_freqs); 384 } 385 386 static int pmac_cpufreq_target( struct cpufreq_policy *policy, 387 unsigned int target_freq, 388 unsigned int relation) 389 { 390 unsigned int newstate = 0; 391 int rc; 392 393 if (cpufreq_frequency_table_target(policy, pmac_cpu_freqs, 394 target_freq, relation, &newstate)) 395 return -EINVAL; 396 397 rc = do_set_cpu_speed(policy, newstate, 1); 398 399 ppc_proc_freq = cur_freq * 1000ul; 400 return rc; 401 } 402 403 static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy) 404 { 405 if (policy->cpu != 0) 406 return -ENODEV; 407 408 policy->cpuinfo.transition_latency = transition_latency; 409 policy->cur = cur_freq; 410 411 cpufreq_frequency_table_get_attr(pmac_cpu_freqs, policy->cpu); 412 return cpufreq_frequency_table_cpuinfo(policy, pmac_cpu_freqs); 413 } 414 415 static u32 read_gpio(struct device_node *np) 416 { 417 const u32 *reg = of_get_property(np, "reg", NULL); 418 u32 offset; 419 420 if (reg == NULL) 421 return 0; 422 /* That works for all keylargos but shall be fixed properly 423 * some day... The problem is that it seems we can't rely 424 * on the "reg" property of the GPIO nodes, they are either 425 * relative to the base of KeyLargo or to the base of the 426 * GPIO space, and the device-tree doesn't help. 427 */ 428 offset = *reg; 429 if (offset < KEYLARGO_GPIO_LEVELS0) 430 offset += KEYLARGO_GPIO_LEVELS0; 431 return offset; 432 } 433 434 static int pmac_cpufreq_suspend(struct cpufreq_policy *policy) 435 { 436 /* Ok, this could be made a bit smarter, but let's be robust for now. We 437 * always force a speed change to high speed before sleep, to make sure 438 * we have appropriate voltage and/or bus speed for the wakeup process, 439 * and to make sure our loops_per_jiffies are "good enough", that is will 440 * not cause too short delays if we sleep in low speed and wake in high 441 * speed.. 442 */ 443 no_schedule = 1; 444 sleep_freq = cur_freq; 445 if (cur_freq == low_freq && !is_pmu_based) 446 do_set_cpu_speed(policy, CPUFREQ_HIGH, 0); 447 return 0; 448 } 449 450 static int pmac_cpufreq_resume(struct cpufreq_policy *policy) 451 { 452 /* If we resume, first check if we have a get() function */ 453 if (get_speed_proc) 454 cur_freq = get_speed_proc(); 455 else 456 cur_freq = 0; 457 458 /* We don't, hrm... we don't really know our speed here, best 459 * is that we force a switch to whatever it was, which is 460 * probably high speed due to our suspend() routine 461 */ 462 do_set_cpu_speed(policy, sleep_freq == low_freq ? 463 CPUFREQ_LOW : CPUFREQ_HIGH, 0); 464 465 ppc_proc_freq = cur_freq * 1000ul; 466 467 no_schedule = 0; 468 return 0; 469 } 470 471 static struct cpufreq_driver pmac_cpufreq_driver = { 472 .verify = pmac_cpufreq_verify, 473 .target = pmac_cpufreq_target, 474 .get = pmac_cpufreq_get_speed, 475 .init = pmac_cpufreq_cpu_init, 476 .suspend = pmac_cpufreq_suspend, 477 .resume = pmac_cpufreq_resume, 478 .flags = CPUFREQ_PM_NO_WARN, 479 .attr = pmac_cpu_freqs_attr, 480 .name = "powermac", 481 }; 482 483 484 static int pmac_cpufreq_init_MacRISC3(struct device_node *cpunode) 485 { 486 struct device_node *volt_gpio_np = of_find_node_by_name(NULL, 487 "voltage-gpio"); 488 struct device_node *freq_gpio_np = of_find_node_by_name(NULL, 489 "frequency-gpio"); 490 struct device_node *slew_done_gpio_np = of_find_node_by_name(NULL, 491 "slewing-done"); 492 const u32 *value; 493 494 /* 495 * Check to see if it's GPIO driven or PMU only 496 * 497 * The way we extract the GPIO address is slightly hackish, but it 498 * works well enough for now. We need to abstract the whole GPIO 499 * stuff sooner or later anyway 500 */ 501 502 if (volt_gpio_np) 503 voltage_gpio = read_gpio(volt_gpio_np); 504 if (freq_gpio_np) 505 frequency_gpio = read_gpio(freq_gpio_np); 506 if (slew_done_gpio_np) 507 slew_done_gpio = read_gpio(slew_done_gpio_np); 508 509 /* If we use the frequency GPIOs, calculate the min/max speeds based 510 * on the bus frequencies 511 */ 512 if (frequency_gpio && slew_done_gpio) { 513 int lenp, rc; 514 const u32 *freqs, *ratio; 515 516 freqs = of_get_property(cpunode, "bus-frequencies", &lenp); 517 lenp /= sizeof(u32); 518 if (freqs == NULL || lenp != 2) { 519 printk(KERN_ERR "cpufreq: bus-frequencies incorrect or missing\n"); 520 return 1; 521 } 522 ratio = of_get_property(cpunode, "processor-to-bus-ratio*2", 523 NULL); 524 if (ratio == NULL) { 525 printk(KERN_ERR "cpufreq: processor-to-bus-ratio*2 missing\n"); 526 return 1; 527 } 528 529 /* Get the min/max bus frequencies */ 530 low_freq = min(freqs[0], freqs[1]); 531 hi_freq = max(freqs[0], freqs[1]); 532 533 /* Grrrr.. It _seems_ that the device-tree is lying on the low bus 534 * frequency, it claims it to be around 84Mhz on some models while 535 * it appears to be approx. 101Mhz on all. Let's hack around here... 536 * fortunately, we don't need to be too precise 537 */ 538 if (low_freq < 98000000) 539 low_freq = 101000000; 540 541 /* Convert those to CPU core clocks */ 542 low_freq = (low_freq * (*ratio)) / 2000; 543 hi_freq = (hi_freq * (*ratio)) / 2000; 544 545 /* Now we get the frequencies, we read the GPIO to see what is out current 546 * speed 547 */ 548 rc = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0); 549 cur_freq = (rc & 0x01) ? hi_freq : low_freq; 550 551 set_speed_proc = gpios_set_cpu_speed; 552 return 1; 553 } 554 555 /* If we use the PMU, look for the min & max frequencies in the 556 * device-tree 557 */ 558 value = of_get_property(cpunode, "min-clock-frequency", NULL); 559 if (!value) 560 return 1; 561 low_freq = (*value) / 1000; 562 /* The PowerBook G4 12" (PowerBook6,1) has an error in the device-tree 563 * here */ 564 if (low_freq < 100000) 565 low_freq *= 10; 566 567 value = of_get_property(cpunode, "max-clock-frequency", NULL); 568 if (!value) 569 return 1; 570 hi_freq = (*value) / 1000; 571 set_speed_proc = pmu_set_cpu_speed; 572 is_pmu_based = 1; 573 574 return 0; 575 } 576 577 static int pmac_cpufreq_init_7447A(struct device_node *cpunode) 578 { 579 struct device_node *volt_gpio_np; 580 581 if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL) 582 return 1; 583 584 volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select"); 585 if (volt_gpio_np) 586 voltage_gpio = read_gpio(volt_gpio_np); 587 if (!voltage_gpio){ 588 printk(KERN_ERR "cpufreq: missing cpu-vcore-select gpio\n"); 589 return 1; 590 } 591 592 /* OF only reports the high frequency */ 593 hi_freq = cur_freq; 594 low_freq = cur_freq/2; 595 596 /* Read actual frequency from CPU */ 597 cur_freq = dfs_get_cpu_speed(); 598 set_speed_proc = dfs_set_cpu_speed; 599 get_speed_proc = dfs_get_cpu_speed; 600 601 return 0; 602 } 603 604 static int pmac_cpufreq_init_750FX(struct device_node *cpunode) 605 { 606 struct device_node *volt_gpio_np; 607 u32 pvr; 608 const u32 *value; 609 610 if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL) 611 return 1; 612 613 hi_freq = cur_freq; 614 value = of_get_property(cpunode, "reduced-clock-frequency", NULL); 615 if (!value) 616 return 1; 617 low_freq = (*value) / 1000; 618 619 volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select"); 620 if (volt_gpio_np) 621 voltage_gpio = read_gpio(volt_gpio_np); 622 623 pvr = mfspr(SPRN_PVR); 624 has_cpu_l2lve = !((pvr & 0xf00) == 0x100); 625 626 set_speed_proc = cpu_750fx_cpu_speed; 627 get_speed_proc = cpu_750fx_get_cpu_speed; 628 cur_freq = cpu_750fx_get_cpu_speed(); 629 630 return 0; 631 } 632 633 /* Currently, we support the following machines: 634 * 635 * - Titanium PowerBook 1Ghz (PMU based, 667Mhz & 1Ghz) 636 * - Titanium PowerBook 800 (PMU based, 667Mhz & 800Mhz) 637 * - Titanium PowerBook 400 (PMU based, 300Mhz & 400Mhz) 638 * - Titanium PowerBook 500 (PMU based, 300Mhz & 500Mhz) 639 * - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz) 640 * - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage) 641 * - Recent MacRISC3 laptops 642 * - All new machines with 7447A CPUs 643 */ 644 static int __init pmac_cpufreq_setup(void) 645 { 646 struct device_node *cpunode; 647 const u32 *value; 648 649 if (strstr(cmd_line, "nocpufreq")) 650 return 0; 651 652 /* Get first CPU node */ 653 cpunode = of_cpu_device_node_get(0); 654 if (!cpunode) 655 goto out; 656 657 /* Get current cpu clock freq */ 658 value = of_get_property(cpunode, "clock-frequency", NULL); 659 if (!value) 660 goto out; 661 cur_freq = (*value) / 1000; 662 transition_latency = CPUFREQ_ETERNAL; 663 664 /* Check for 7447A based MacRISC3 */ 665 if (of_machine_is_compatible("MacRISC3") && 666 of_get_property(cpunode, "dynamic-power-step", NULL) && 667 PVR_VER(mfspr(SPRN_PVR)) == 0x8003) { 668 pmac_cpufreq_init_7447A(cpunode); 669 transition_latency = 8000000; 670 /* Check for other MacRISC3 machines */ 671 } else if (of_machine_is_compatible("PowerBook3,4") || 672 of_machine_is_compatible("PowerBook3,5") || 673 of_machine_is_compatible("MacRISC3")) { 674 pmac_cpufreq_init_MacRISC3(cpunode); 675 /* Else check for iBook2 500/600 */ 676 } else if (of_machine_is_compatible("PowerBook4,1")) { 677 hi_freq = cur_freq; 678 low_freq = 400000; 679 set_speed_proc = pmu_set_cpu_speed; 680 is_pmu_based = 1; 681 } 682 /* Else check for TiPb 550 */ 683 else if (of_machine_is_compatible("PowerBook3,3") && cur_freq == 550000) { 684 hi_freq = cur_freq; 685 low_freq = 500000; 686 set_speed_proc = pmu_set_cpu_speed; 687 is_pmu_based = 1; 688 } 689 /* Else check for TiPb 400 & 500 */ 690 else if (of_machine_is_compatible("PowerBook3,2")) { 691 /* We only know about the 400 MHz and the 500Mhz model 692 * they both have 300 MHz as low frequency 693 */ 694 if (cur_freq < 350000 || cur_freq > 550000) 695 goto out; 696 hi_freq = cur_freq; 697 low_freq = 300000; 698 set_speed_proc = pmu_set_cpu_speed; 699 is_pmu_based = 1; 700 } 701 /* Else check for 750FX */ 702 else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000) 703 pmac_cpufreq_init_750FX(cpunode); 704 out: 705 of_node_put(cpunode); 706 if (set_speed_proc == NULL) 707 return -ENODEV; 708 709 pmac_cpu_freqs[CPUFREQ_LOW].frequency = low_freq; 710 pmac_cpu_freqs[CPUFREQ_HIGH].frequency = hi_freq; 711 ppc_proc_freq = cur_freq * 1000ul; 712 713 printk(KERN_INFO "Registering PowerMac CPU frequency driver\n"); 714 printk(KERN_INFO "Low: %d Mhz, High: %d Mhz, Boot: %d Mhz\n", 715 low_freq/1000, hi_freq/1000, cur_freq/1000); 716 717 return cpufreq_register_driver(&pmac_cpufreq_driver); 718 } 719 720 module_init(pmac_cpufreq_setup); 721 722