1 // SPDX-License-Identifier: GPL-2.0-only
3  *  Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
4  *  and                       Markus Demleitner <msdemlei@cl.uni-heidelberg.de>
18 #include <linux/delay.h>
73  * the various frequencies, retrieved from the device-tree
117 	u32 slew, done = 0;  in g5_vdnap_switch_volt()  local
120 	slew = (speed_mode == CPUFREQ_LOW) ? 1 : 0;  in g5_vdnap_switch_volt()
122 	args.u[0].p = &slew;  in g5_vdnap_switch_volt()
349 	int rc = -ENODEV;  in g5_neo2_cpufreq_init()
360 		return -ENODEV;  in g5_neo2_cpufreq_init()
363 	valp = of_get_property(cpunode, "cpu-version", NULL);  in g5_neo2_cpufreq_init()
365 		DBG("No cpu-version property !\n");  in g5_neo2_cpufreq_init()
374 	/* Look for the powertune data in the device-tree */  in g5_neo2_cpufreq_init()
375 	g5_pmode_data = of_get_property(cpunode, "power-mode-data",&psize);  in g5_neo2_cpufreq_init()
377 		DBG("No power-mode-data !\n");  in g5_neo2_cpufreq_init()
380 	g5_pmode_max = psize / sizeof(u32) - 1;  in g5_neo2_cpufreq_init()
390 		ssize = (shdr->len * sizeof(u32)) - sizeof(*shdr);  in g5_neo2_cpufreq_init()
408 		pfunc_set_vdnap0 = pmf_find_function(root, "set-vdnap0");  in g5_neo2_cpufreq_init()
410 			pmf_find_function(root, "slewing-done");  in g5_neo2_cpufreq_init()
426 	 * From what I see, clock-frequency is always the maximal frequency.  in g5_neo2_cpufreq_init()
427 	 * The current driver can not slew sysclk yet, so we really only deal  in g5_neo2_cpufreq_init()
432 	valp = of_get_property(cpunode, "clock-frequency", NULL);  in g5_neo2_cpufreq_init()
434 		return -ENODEV;  in g5_neo2_cpufreq_init()
446 	 * sync (voltage is right for example). Firmware may leave us with  in g5_neo2_cpufreq_init()
451 	g5_pmode_cur = -1;  in g5_neo2_cpufreq_init()
465 	 * hotplug CPU with a dynamic device-tree ...  in g5_neo2_cpufreq_init()
495 		rc = -ENODEV;  in g5_pm72_cpufreq_init()
500 	for_each_node_by_name(hwclock, "i2c-hwclock") {  in g5_pm72_cpufreq_init()
502 				"hwctrl-location", NULL);  in g5_pm72_cpufreq_init()
507 		if (!of_property_present(hwclock, "platform-get-frequency"))  in g5_pm72_cpufreq_init()
513 		rc = -ENODEV;  in g5_pm72_cpufreq_init()
521 		pmf_find_function(hwclock, "get-frequency");  in g5_pm72_cpufreq_init()
523 		pmf_find_function(hwclock, "set-frequency-high");  in g5_pm72_cpufreq_init()
525 		pmf_find_function(hwclock, "set-frequency-low");  in g5_pm72_cpufreq_init()
527 		pmf_find_function(hwclock, "slewing-done");  in g5_pm72_cpufreq_init()
529 		pmf_find_function(hwclock, "set-voltage-high-0");  in g5_pm72_cpufreq_init()
531 		pmf_find_function(hwclock, "set-voltage-low-0");  in g5_pm72_cpufreq_init()
533 		pmf_find_function(hwclock, "set-voltage-high-1");  in g5_pm72_cpufreq_init()
535 		pmf_find_function(hwclock, "set-voltage-low-1");  in g5_pm72_cpufreq_init()
541 		rc = -ENODEV;  in g5_pm72_cpufreq_init()
559 	/* Note: The device tree also contains a "platform-set-values"  in g5_pm72_cpufreq_init()
565 	/* Get max frequency from device-tree */  in g5_pm72_cpufreq_init()
566 	valp = of_get_property(cpunode, "clock-frequency", NULL);  in g5_pm72_cpufreq_init()
569 		rc = -ENODEV;  in g5_pm72_cpufreq_init()
585 		rc = -ENODEV;  in g5_pm72_cpufreq_init()
596 		rc = -ENXIO;  in g5_pm72_cpufreq_init()
611 	 * sync (voltage is right for example). Firmware may leave us with  in g5_pm72_cpufreq_init()
616 	g5_pmode_cur = -1;  in g5_pm72_cpufreq_init()
655 		return -ENODEV;  in g5_cpufreq_init()