[linux-2.6-block.git] / drivers / clocksource / timer-versatile.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);
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
220e2a8d	2	/*
220e2a8d PM	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
	14	static void __iomem *versatile_sys_24mhz;
	15
1605abff	16	static u64 notrace versatile_sys_24mhz_read(void)
220e2a8d PM	17	{
	18	return readl(versatile_sys_24mhz);
	19	}
	20
86de9628	21	static int __init versatile_sched_clock_init(struct device_node *node)
220e2a8d PM	22	{
	23	void __iomem *base = of_iomap(node, 0);
	24
	25	if (!base)
86de9628	26	return -ENXIO;
220e2a8d PM	27
	28	versatile_sys_24mhz = base + SYS_24MHZ;
	29
1605abff	30	sched_clock_register(versatile_sys_24mhz_read, 32, 24000000);
86de9628 DL	31
86de9628 DL	32	return 0;
220e2a8d	33	}
17273395	34	TIMER_OF_DECLARE(vexpress, "arm,vexpress-sysreg",
f2fa0299	35	versatile_sched_clock_init);
17273395	36	TIMER_OF_DECLARE(versatile, "arm,versatile-sysreg",
1605abff	37	versatile_sched_clock_init);