4 * Copyright (C) 2010 Magnus Damm
5 * Copyright (C) 2002 - 2009 Paul Mundt
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; version 2 of the License.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 #include <linux/platform_device.h>
17 #include <linux/clocksource.h>
18 #include <linux/delay.h>
19 #include <linux/of_address.h>
23 void __init shmobile_init_delay(void)
25 struct device_node *np, *cpus;
28 cpus = of_find_node_by_path("/cpus");
32 for_each_child_of_node(cpus, np) {
35 if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER) &&
36 (of_device_is_compatible(np, "arm,cortex-a7") ||
37 of_device_is_compatible(np, "arm,cortex-a15"))) {
43 if (!of_property_read_u32(np, "clock-frequency", &freq))
44 max_freq = max(max_freq, freq);
53 * Calculate a worst-case loops-per-jiffy value
54 * based on maximum cpu core hz setting and the
55 * __delay() implementation in arch/arm/lib/delay.S.
57 * This will result in a longer delay than expected
58 * when the cpu core runs on lower frequencies.
62 preset_lpj = max_freq / HZ;