[linux-2.6-block.git] / drivers / clocksource / versatile.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 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;
}
CLOCKSOURCE_OF_DECLARE(vexpress, "arm,vexpress-sysreg",
		       versatile_sched_clock_init);
CLOCKSOURCE_OF_DECLARE(versatile, "arm,versatile-sysreg",
		       versatile_sched_clock_init);
Commit	Line	Data
220e2a8d PM	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License version 2 as
	4	* published by the Free Software Foundation.
	5	*
	6	* This program is distributed in the hope that it will be useful,
	7	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	8	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	9	* GNU General Public License for more details.
	10	*
	11	* Copyright (C) 2014 ARM Limited
	12	*/
	13
	14	#include <linux/clocksource.h>
	15	#include <linux/io.h>
	16	#include <linux/of_address.h>
	17	#include <linux/sched_clock.h>
	18
	19	#define SYS_24MHZ 0x05c
	20
	21	static void __iomem *versatile_sys_24mhz;
	22
1605abff	23	static u64 notrace versatile_sys_24mhz_read(void)
220e2a8d PM	24	{
	25	return readl(versatile_sys_24mhz);
	26	}
	27
86de9628	28	static int __init versatile_sched_clock_init(struct device_node *node)
220e2a8d PM	29	{
	30	void __iomem *base = of_iomap(node, 0);
	31
	32	if (!base)
86de9628	33	return -ENXIO;
220e2a8d PM	34
	35	versatile_sys_24mhz = base + SYS_24MHZ;
	36
1605abff	37	sched_clock_register(versatile_sys_24mhz_read, 32, 24000000);
86de9628 DL	38
86de9628 DL	39	return 0;
220e2a8d	40	}
177cf6e5	41	CLOCKSOURCE_OF_DECLARE(vexpress, "arm,vexpress-sysreg",
f2fa0299	42	versatile_sched_clock_init);
177cf6e5	43	CLOCKSOURCE_OF_DECLARE(versatile, "arm,versatile-sysreg",
1605abff	44	versatile_sched_clock_init);