110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/**************************************************************************
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*
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* BRIEF MODULE DESCRIPTION
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* timer routines for IDT EB434 boards
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*
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* Copyright 2004 IDT Inc. (rischelp@idt.com)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*
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**************************************************************************
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* May 2004 rkt, neb
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*
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* Initial Release
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*
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*
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*
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**************************************************************************
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*/
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#include <linux/autoconf.h>
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#include <linux/init.h>
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#include <linux/kernel_stat.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/mc146818rtc.h>
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#include <linux/irq.h>
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#include <linux/timex.h>
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#include <linux/param.h>
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#include <asm/mipsregs.h>
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#include <asm/ptrace.h>
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#include <asm/time.h>
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#include <asm/hardirq.h>
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#include <asm/mipsregs.h>
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#include <asm/ptrace.h>
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#include <asm/debug.h>
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#include <asm/time.h>
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#include <asm/idt-boards/rc32434/rc32434.h>
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static unsigned long r4k_offset; /* Amount to incr compare reg each time */
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static unsigned long r4k_cur; /* What counter should be at next timer irq */
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extern unsigned int idt_cpu_freq;
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static unsigned long __init cal_r4koff(void)
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{
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mips_hpt_frequency = idt_cpu_freq * IDT_CLOCK_MULT / 2;
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return (mips_hpt_frequency / HZ);
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}
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void __init aruba_time_init(void)
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{
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unsigned int est_freq, flags;
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local_irq_save(flags);
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printk("calculating r4koff... ");
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r4k_offset = cal_r4koff();
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printk("%08lx(%d)\n", r4k_offset, (int)r4k_offset);
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est_freq = 2 * r4k_offset * HZ;
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est_freq += 5000; /* round */
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est_freq -= est_freq % 10000;
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printk("CPU frequency %d.%02d MHz\n", est_freq / 1000000,
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(est_freq % 1000000) * 100 / 1000000);
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local_irq_restore(flags);
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}
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void __init plat_timer_setup(struct irqaction *irq)
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{
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/* we are using the cpu counter for timer interrupts */
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setup_irq(MIPS_CPU_TIMER_IRQ, irq);
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/* to generate the first timer interrupt */
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r4k_cur = (read_c0_count() + r4k_offset);
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write_c0_compare(r4k_cur);
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}
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asmlinkage void aruba_timer_interrupt(struct pt_regs *regs)
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{
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int irq = MIPS_CPU_TIMER_IRQ;
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irq_enter();
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kstat_this_cpu.irqs[irq]++;
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timer_interrupt(irq, NULL);
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irq_exit();
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}
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