38 lines
802 B
C
38 lines
802 B
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
*
|
||
|
|
* Copyright (C) 2014 ARM Limited
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/clocksource.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/of_address.h>
|
||
|
|
#include <linux/sched_clock.h>
|
||
|
|
|
||
|
|
#define SYS_24MHZ 0x05c
|
||
|
|
|
||
|
|
static void __iomem *versatile_sys_24mhz;
|
||
|
|
|
||
|
|
static u64 notrace versatile_sys_24mhz_read(void)
|
||
|
|
{
|
||
|
|
return readl(versatile_sys_24mhz);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init versatile_sched_clock_init(struct device_node *node)
|
||
|
|
{
|
||
|
|
void __iomem *base = of_iomap(node, 0);
|
||
|
|
|
||
|
|
if (!base)
|
||
|
|
return -ENXIO;
|
||
|
|
|
||
|
|
versatile_sys_24mhz = base + SYS_24MHZ;
|
||
|
|
|
||
|
|
sched_clock_register(versatile_sys_24mhz_read, 32, 24000000);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
TIMER_OF_DECLARE(vexpress, "arm,vexpress-sysreg",
|
||
|
|
versatile_sched_clock_init);
|
||
|
|
TIMER_OF_DECLARE(versatile, "arm,versatile-sysreg",
|
||
|
|
versatile_sched_clock_init);
|