[linux.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.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);

	of_node_clear_flag(node, OF_POPULATED);

	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>
7a3768c2	9	#include <linux/of.h>
220e2a8d PM	10	#include <linux/of_address.h>
	11	#include <linux/sched_clock.h>
	12
	13	#define SYS_24MHZ 0x05c
	14
	15	static void __iomem *versatile_sys_24mhz;
	16
1605abff	17	static u64 notrace versatile_sys_24mhz_read(void)
220e2a8d PM	18	{
	19	return readl(versatile_sys_24mhz);
	20	}
	21
86de9628	22	static int __init versatile_sched_clock_init(struct device_node *node)
220e2a8d PM	23	{
	24	void __iomem *base = of_iomap(node, 0);
	25
7a3768c2 SK	26	of_node_clear_flag(node, OF_POPULATED);
7a3768c2 SK	27
220e2a8d	28	if (!base)
86de9628	29	return -ENXIO;
220e2a8d PM	30
	31	versatile_sys_24mhz = base + SYS_24MHZ;
	32
1605abff	33	sched_clock_register(versatile_sys_24mhz_read, 32, 24000000);
86de9628 DL	34
86de9628 DL	35	return 0;
220e2a8d	36	}
17273395	37	TIMER_OF_DECLARE(vexpress, "arm,vexpress-sysreg",
f2fa0299	38	versatile_sched_clock_init);
17273395	39	TIMER_OF_DECLARE(versatile, "arm,versatile-sysreg",
1605abff	40	versatile_sched_clock_init);