mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-10 02:59:42 +02:00
c4105c81c0
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7284 3c298f89-4303-0410-b956-a3cf2f4a3e73
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/**************************************************************************
|
|
*
|
|
* BRIEF MODULE DESCRIPTION
|
|
* timer routines for IDT EB434 boards
|
|
*
|
|
* Copyright 2004 IDT Inc. (rischelp@idt.com)
|
|
*
|
|
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
|
|
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* 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.,
|
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*
|
|
**************************************************************************
|
|
* May 2004 rkt, neb
|
|
*
|
|
* Initial Release
|
|
*
|
|
*
|
|
*
|
|
**************************************************************************
|
|
*/
|
|
|
|
#include <linux/autoconf.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/mc146818rtc.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/timex.h>
|
|
|
|
#include <linux/param.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/time.h>
|
|
#include <asm/hardirq.h>
|
|
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/debug.h>
|
|
#include <asm/time.h>
|
|
|
|
#include <asm/idt-boards/rc32434/rc32434.h>
|
|
|
|
static unsigned long r4k_offset; /* Amount to incr compare reg each time */
|
|
static unsigned long r4k_cur; /* What counter should be at next timer irq */
|
|
|
|
extern unsigned int idt_cpu_freq;
|
|
|
|
static unsigned long __init cal_r4koff(void)
|
|
{
|
|
mips_hpt_frequency = idt_cpu_freq * IDT_CLOCK_MULT / 2;
|
|
return (mips_hpt_frequency / HZ);
|
|
}
|
|
|
|
void __init aruba_time_init(void)
|
|
{
|
|
unsigned int est_freq, flags;
|
|
local_irq_save(flags);
|
|
|
|
printk("calculating r4koff... ");
|
|
r4k_offset = cal_r4koff();
|
|
printk("%08lx(%d)\n", r4k_offset, (int)r4k_offset);
|
|
|
|
est_freq = 2 * r4k_offset * HZ;
|
|
est_freq += 5000; /* round */
|
|
est_freq -= est_freq % 10000;
|
|
printk("CPU frequency %d.%02d MHz\n", est_freq / 1000000,
|
|
(est_freq % 1000000) * 100 / 1000000);
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
void __init plat_timer_setup(struct irqaction *irq)
|
|
{
|
|
/* we are using the cpu counter for timer interrupts */
|
|
setup_irq(MIPS_CPU_TIMER_IRQ, irq);
|
|
|
|
/* to generate the first timer interrupt */
|
|
r4k_cur = (read_c0_count() + r4k_offset);
|
|
write_c0_compare(r4k_cur);
|
|
|
|
}
|
|
|
|
asmlinkage void aruba_timer_interrupt(struct pt_regs *regs)
|
|
{
|
|
int irq = MIPS_CPU_TIMER_IRQ;
|
|
|
|
irq_enter();
|
|
kstat_this_cpu.irqs[irq]++;
|
|
|
|
timer_interrupt(irq, NULL);
|
|
irq_exit();
|
|
}
|