1 // SPDX-License-Identifier: GPL-2.0-only
3  *  Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
42  * init/main.c to make it non-init before enabling DEBUG_FREQ
101 	 * core cpufreq framework's own calculation.  in debug_calc_bogomips()
198 		/* Delay is way too big but it's ok, we schedule */  in gpios_set_cpu_speed()
220 		/* Delay is way too big but it's ok, we schedule */  in gpios_set_cpu_speed()
255 	 * the above didn't re-enable the DEC */  in pmu_set_cpu_speed()
271 	save_l3cr = _get_L3CR();	/* (returns -1 if not available) */  in pmu_set_cpu_speed()
272 	save_l2cr = _get_L2CR();	/* (returns -1 if not available) */  in pmu_set_cpu_speed()
299 	/* Restore userland MMU context */  in pmu_set_cpu_speed()
300 	switch_mmu_context(NULL, current->active_mm, NULL);  in pmu_set_cpu_speed()
311 	 * as soon as interrupts are re-enabled and the generic  in pmu_set_cpu_speed()
390 	 * GPIO space, and the device-tree doesn't help.  in read_gpio()
399 	/* Ok, this could be made a bit smarter, but let's be robust for now. We  in pmac_cpufreq_suspend()
450 								"voltage-gpio");  in pmac_cpufreq_init_MacRISC3()
452 								"frequency-gpio");  in pmac_cpufreq_init_MacRISC3()
454 								     "slewing-done");  in pmac_cpufreq_init_MacRISC3()
458 	 * Check to see if it's GPIO driven or PMU only  in pmac_cpufreq_init_MacRISC3()
483 		freqs = of_get_property(cpunode, "bus-frequencies", &lenp);  in pmac_cpufreq_init_MacRISC3()
486 			pr_err("bus-frequencies incorrect or missing\n");  in pmac_cpufreq_init_MacRISC3()
489 		ratio = of_get_property(cpunode, "processor-to-bus-ratio*2",  in pmac_cpufreq_init_MacRISC3()
492 			pr_err("processor-to-bus-ratio*2 missing\n");  in pmac_cpufreq_init_MacRISC3()
500 		/* Grrrr.. It _seems_ that the device-tree is lying on the low bus  in pmac_cpufreq_init_MacRISC3()
502 		 * it appears to be approx. 101Mhz on all. Let's hack around here...  in pmac_cpufreq_init_MacRISC3()
523 	 * device-tree  in pmac_cpufreq_init_MacRISC3()
525 	value = of_get_property(cpunode, "min-clock-frequency", NULL);  in pmac_cpufreq_init_MacRISC3()
529 	/* The PowerBook G4 12" (PowerBook6,1) has an error in the device-tree  in pmac_cpufreq_init_MacRISC3()
534 	value = of_get_property(cpunode, "max-clock-frequency", NULL);  in pmac_cpufreq_init_MacRISC3()
548 	if (!of_property_read_bool(cpunode, "dynamic-power-step"))  in pmac_cpufreq_init_7447A()
551 	volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");  in pmac_cpufreq_init_7447A()
556 		pr_err("missing cpu-vcore-select gpio\n");  in pmac_cpufreq_init_7447A()
578 	if (!of_property_read_bool(cpunode, "dynamic-power-step"))  in pmac_cpufreq_init_750FX()
582 	value = of_get_property(cpunode, "reduced-clock-frequency", NULL);  in pmac_cpufreq_init_750FX()
587 	volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");  in pmac_cpufreq_init_750FX()
604  *  - Titanium PowerBook 1Ghz (PMU based, 667Mhz & 1Ghz)
605  *  - Titanium PowerBook 800 (PMU based, 667Mhz & 800Mhz)
606  *  - Titanium PowerBook 400 (PMU based, 300Mhz & 400Mhz)
607  *  - Titanium PowerBook 500 (PMU based, 300Mhz & 500Mhz)
608  *  - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz)
609  *  - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage)
610  *  - Recent MacRISC3 laptops
611  *  - All new machines with 7447A CPUs
627 	value = of_get_property(cpunode, "clock-frequency", NULL);  in pmac_cpufreq_setup()
634 	    of_property_read_bool(cpunode, "dynamic-power-step") &&  in pmac_cpufreq_setup()
646 	/* Else check for iBook2 500/600 */  in pmac_cpufreq_setup()
660 	/* Else check for TiPb 400 & 500 */  in pmac_cpufreq_setup()
662 		/* We only know about the 400 MHz and the 500Mhz model  in pmac_cpufreq_setup()
678 		return -ENODEV;  in pmac_cpufreq_setup()