diff options
Diffstat (limited to 'cpu/ixp/timer.c')
| -rw-r--r-- | cpu/ixp/timer.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/cpu/ixp/timer.c b/cpu/ixp/timer.c new file mode 100644 index 0000000..baa7e72 --- /dev/null +++ b/cpu/ixp/timer.c @@ -0,0 +1,74 @@ +/* vi: set ts=8 sw=8 noet: */ +/* + * (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> + * + * 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 <asm/arch/ixp425.h> + +void ixp425_udelay(unsigned long usec) +{ + /* + * This function has a max usec, but since it is called from udelay + * we should not have to worry... be happy + */ + unsigned long usecs = CFG_HZ/1000000L & ~IXP425_OST_RELOAD_MASK; + + *IXP425_OSST = IXP425_OSST_TIMER_1_PEND; + usecs |= IXP425_OST_ONE_SHOT | IXP425_OST_ENABLE; + *IXP425_OSRT1 = usecs; + while (!(*IXP425_OSST & IXP425_OSST_TIMER_1_PEND)); +} + +void udelay (unsigned long usec) +{ + while (usec--) ixp425_udelay(1); +} + +static ulong reload_constant = 0xfffffff0; + +void reset_timer_masked (void) +{ + ulong reload = reload_constant | IXP425_OST_ONE_SHOT | IXP425_OST_ENABLE; + + *IXP425_OSST = IXP425_OSST_TIMER_1_PEND; + *IXP425_OSRT1 = reload; +} + +ulong get_timer_masked (void) +{ + /* + * Note that it is possible for this to wrap! + * In this case we return max. + */ + ulong current = *IXP425_OST1; + if (*IXP425_OSST & IXP425_OSST_TIMER_1_PEND) + { + return reload_constant; + } + return (reload_constant - current); +} |