Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Copyright (C) 2014 ARM Limited
5 */
6
7#include <linux/clocksource.h>
8#include <linux/io.h>
9#include <linux/of_address.h>
10#include <linux/sched_clock.h>
11
12#define SYS_24MHZ 0x05c
13
14static void __iomem *versatile_sys_24mhz;
15
16static u64 notrace versatile_sys_24mhz_read(void)
17{
18 return readl(versatile_sys_24mhz);
19}
20
21static int __init versatile_sched_clock_init(struct device_node *node)
22{
23 void __iomem *base = of_iomap(node, 0);
24
25 if (!base)
26 return -ENXIO;
27
28 versatile_sys_24mhz = base + SYS_24MHZ;
29
30 sched_clock_register(versatile_sys_24mhz_read, 32, 24000000);
31
32 return 0;
33}
34TIMER_OF_DECLARE(vexpress, "arm,vexpress-sysreg",
35 versatile_sched_clock_init);
36TIMER_OF_DECLARE(versatile, "arm,versatile-sysreg",
37 versatile_sched_clock_init);