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/*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* 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.
*
*/
#include <common.h>
#include <init.h>
#include <clock.h>
#include <asm/hardware.h>
#include <mach/at91_pit.h>
#include <mach/at91_pmc.h>
#include <mach/at91_rstc.h>
#include <mach/io.h>
#include <io.h>
uint64_t at91sam9_clocksource_read(void)
{
return at91_sys_read(AT91_PIT_PIIR);
}
static struct clocksource cs = {
.read = at91sam9_clocksource_read,
.mask = CLOCKSOURCE_MASK(32),
.shift = 10,
};
static int clocksource_init (void)
{
/*
* Enable PITC Clock
* The clock is already enabled for system controller in boot
*/
at91_sys_write(AT91_PMC_PCER, 1 << AT91_ID_SYS);
/* Enable PITC */
at91_sys_write(AT91_PIT_MR, 0xfffff | AT91_PIT_PITEN);
cs.mult = clocksource_hz2mult(1000000 * 6, cs.shift);
init_clock(&cs);
return 0;
}
core_initcall(clocksource_init);
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