Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * SH-Mobile Timer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2010  Magnus Damm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copyright (C) 2002 - 2009  Paul Mundt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/clocksource.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "common.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) void __init shmobile_init_delay(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	struct device_node *np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	u32 max_freq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	for_each_of_cpu_node(np) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 		u32 freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		if (!of_property_read_u32(np, "clock-frequency", &freq))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 			max_freq = max(max_freq, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	if (!max_freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	 * Calculate a worst-case loops-per-jiffy value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	 * based on maximum cpu core hz setting and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	 * __delay() implementation in arch/arm/lib/delay.S.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	 * This will result in a longer delay than expected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	 * when the cpu core runs on lower frequencies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	if (!preset_lpj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		preset_lpj = max_freq / HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }