1 // SPDX-License-Identifier: GPL-2.0-only
3  *  Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
41  * init/main.c to make it non-init before enabling DEBUG_FREQ
108 /* Switch CPU speed under 750FX CPU control
168 	udelay(100);  in dfs_set_cpu_speed()
210 		if (++timeout > 100)  in gpios_set_cpu_speed()
254 	 * the above didn't re-enable the DEC */  in pmu_set_cpu_speed()
270 	save_l3cr = _get_L3CR();	/* (returns -1 if not available) */  in pmu_set_cpu_speed()
271 	save_l2cr = _get_L2CR();	/* (returns -1 if not available) */  in pmu_set_cpu_speed()
299 	switch_mmu_context(NULL, current->active_mm, NULL);  in pmu_set_cpu_speed()
310 	 * as soon as interrupts are re-enabled and the generic  in pmu_set_cpu_speed()
389 	 * relative to the base of KeyLargo or to the base of the  in read_gpio()
390 	 * GPIO space, and the device-tree doesn't help.  in read_gpio()
451 								"voltage-gpio");  in pmac_cpufreq_init_MacRISC3()
453 								"frequency-gpio");  in pmac_cpufreq_init_MacRISC3()
455 								     "slewing-done");  in pmac_cpufreq_init_MacRISC3()
480 		freqs = of_get_property(cpunode, "bus-frequencies", &lenp);  in pmac_cpufreq_init_MacRISC3()
483 			pr_err("bus-frequencies incorrect or missing\n");  in pmac_cpufreq_init_MacRISC3()
486 		ratio = of_get_property(cpunode, "processor-to-bus-ratio*2",  in pmac_cpufreq_init_MacRISC3()
489 			pr_err("processor-to-bus-ratio*2 missing\n");  in pmac_cpufreq_init_MacRISC3()
497 		/* Grrrr.. It _seems_ that the device-tree is lying on the low bus  in pmac_cpufreq_init_MacRISC3()
520 	 * device-tree  in pmac_cpufreq_init_MacRISC3()
522 	value = of_get_property(cpunode, "min-clock-frequency", NULL);  in pmac_cpufreq_init_MacRISC3()
526 	/* The PowerBook G4 12" (PowerBook6,1) has an error in the device-tree  in pmac_cpufreq_init_MacRISC3()
531 	value = of_get_property(cpunode, "max-clock-frequency", NULL);  in pmac_cpufreq_init_MacRISC3()
545 	if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)  in pmac_cpufreq_init_7447A()
548 	volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");  in pmac_cpufreq_init_7447A()
553 		pr_err("missing cpu-vcore-select gpio\n");  in pmac_cpufreq_init_7447A()
575 	if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)  in pmac_cpufreq_init_750FX()
579 	value = of_get_property(cpunode, "reduced-clock-frequency", NULL);  in pmac_cpufreq_init_750FX()
584 	volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");  in pmac_cpufreq_init_750FX()
601  *  - Titanium PowerBook 1Ghz (PMU based, 667Mhz & 1Ghz)
602  *  - Titanium PowerBook 800 (PMU based, 667Mhz & 800Mhz)
603  *  - Titanium PowerBook 400 (PMU based, 300Mhz & 400Mhz)
604  *  - Titanium PowerBook 500 (PMU based, 300Mhz & 500Mhz)
605  *  - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz)
606  *  - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage)
607  *  - Recent MacRISC3 laptops
608  *  - All new machines with 7447A CPUs
624 	value = of_get_property(cpunode, "clock-frequency", NULL);  in pmac_cpufreq_setup()
631 	    of_get_property(cpunode, "dynamic-power-step", NULL) &&  in pmac_cpufreq_setup()
669 	/* Else check for 750FX */  in pmac_cpufreq_setup()
675 		return -ENODEV;  in pmac_cpufreq_setup()