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
15 void __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 }