2008-06-04 07:31:15 +00:00
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/*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <init.h>
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#include <clock.h>
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#include <asm/hardware.h>
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2009-10-22 12:21:25 +00:00
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#include <mach/at91_pit.h>
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#include <mach/at91_pmc.h>
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#include <mach/at91_rstc.h>
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#include <mach/io.h>
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2011-09-22 17:02:57 +00:00
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#include <io.h>
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2008-06-04 07:31:15 +00:00
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uint64_t at91sam9_clocksource_read(void)
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{
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2009-10-03 23:20:22 +00:00
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return at91_sys_read(AT91_PIT_PIIR);
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2008-06-04 07:31:15 +00:00
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}
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static struct clocksource cs = {
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.read = at91sam9_clocksource_read,
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2010-11-29 14:14:04 +00:00
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.mask = CLOCKSOURCE_MASK(32),
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2008-06-04 07:31:15 +00:00
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.shift = 10,
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};
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static int clocksource_init (void)
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{
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/*
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* Enable PITC Clock
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* The clock is already enabled for system controller in boot
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*/
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2009-10-03 23:20:22 +00:00
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at91_sys_write(AT91_PMC_PCER, 1 << AT91_ID_SYS);
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2008-06-04 07:31:15 +00:00
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/* Enable PITC */
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2009-10-03 23:20:22 +00:00
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at91_sys_write(AT91_PIT_MR, 0xfffff | AT91_PIT_PITEN);
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2008-06-04 07:31:15 +00:00
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cs.mult = clocksource_hz2mult(1000000 * 6, cs.shift);
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init_clock(&cs);
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return 0;
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}
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core_initcall(clocksource_init);
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