diff options
Diffstat (limited to 'target/linux/aruba-2.6/files/arch/mips/aruba/time.c')
| -rw-r--r-- | target/linux/aruba-2.6/files/arch/mips/aruba/time.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/target/linux/aruba-2.6/files/arch/mips/aruba/time.c b/target/linux/aruba-2.6/files/arch/mips/aruba/time.c new file mode 100644 index 0000000000..3c63816316 --- /dev/null +++ b/target/linux/aruba-2.6/files/arch/mips/aruba/time.c @@ -0,0 +1,110 @@ +/************************************************************************** + * + * 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(); +} |