1// SPDX-License-Identifier: GPL-2.0
2/*
3 * SH-Mobile Timer
4 *
5 * Copyright (C) 2010  Magnus Damm
6 * Copyright (C) 2002 - 2009  Paul Mundt
7 */
8#include <linux/platform_device.h>
9#include <linux/clocksource.h>
10#include <linux/delay.h>
11#include <linux/of_address.h>
12
13#include "common.h"
14
15void __init shmobile_init_delay(void)
16{
17	struct device_node *np;
18	u32 max_freq = 0;
19
20	for_each_of_cpu_node(np) {
21		u32 freq;
22
23		if (!of_property_read_u32(np, "clock-frequency", &freq))
24			max_freq = max(max_freq, freq);
25	}
26
27	if (!max_freq)
28		return;
29
30	/*
31	 * Calculate a worst-case loops-per-jiffy value
32	 * based on maximum cpu core hz setting and the
33	 * __delay() implementation in arch/arm/lib/delay.S.
34	 *
35	 * This will result in a longer delay than expected
36	 * when the cpu core runs on lower frequencies.
37	 */
38
39	if (!preset_lpj)
40		preset_lpj = max_freq / HZ;
41}
42