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/*
* (C) Copyright 2000, 2001
* Wolfgang Denk, DENX Software Engineering, wd@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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <clock.h>
#include <init.h>
#include <mach/clocks.h>
#include <asm/common.h>
/* ------------------------------------------------------------------------- */
static int init_timebase (void)
{
#if defined(CONFIG_5xx) || defined(CONFIG_8xx)
volatile immap_t *immap = (immap_t *) CFG_IMMR;
/* unlock */
immap->im_sitk.sitk_tbk = KAPWR_KEY;
#endif
/* reset */
asm ("li 3,0 ; mttbu 3 ; mttbl 3 ;");
#if defined(CONFIG_5xx) || defined(CONFIG_8xx)
/* enable */
immap->im_sit.sit_tbscr |= TBSCR_TBE;
#endif
return (0);
}
/* ------------------------------------------------------------------------- */
uint64_t ppc_clocksource_read(void)
{
return get_ticks();
}
static struct clocksource cs = {
.read = ppc_clocksource_read,
.mask = 0xffffffff,
.shift = 15,
};
static int clocksource_init (void)
{
init_timebase();
cs.mult = clocksource_hz2mult(get_timebase_clock(), cs.shift);
init_clock(&cs);
return 0;
}
core_initcall(clocksource_init);
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