mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 13:41:51 +00:00
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/*
|
|
* linux/arch/arm/mach-clps711x/time.c
|
|
*
|
|
* Copyright (C) 2001 Deep Blue Solutions Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* 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 <linux/timex.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <mach/hardware.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/leds.h>
|
|
#include <asm/hardware/clps7111.h>
|
|
|
|
#include <asm/mach/time.h>
|
|
|
|
|
|
/*
|
|
* gettimeoffset() returns time since last timer tick, in usecs.
|
|
*
|
|
* 'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy.
|
|
* 'tick' is usecs per jiffy.
|
|
*/
|
|
static unsigned long clps711x_gettimeoffset(void)
|
|
{
|
|
unsigned long hwticks;
|
|
hwticks = LATCH - (clps_readl(TC2D) & 0xffff); /* since last underflow */
|
|
return (hwticks * (tick_nsec / 1000)) / LATCH;
|
|
}
|
|
|
|
/*
|
|
* IRQ handler for the timer
|
|
*/
|
|
static irqreturn_t
|
|
p720t_timer_interrupt(int irq, void *dev_id)
|
|
{
|
|
timer_tick();
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction clps711x_timer_irq = {
|
|
.name = "CLPS711x Timer Tick",
|
|
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
|
|
.handler = p720t_timer_interrupt,
|
|
};
|
|
|
|
static void __init clps711x_timer_init(void)
|
|
{
|
|
struct timespec tv;
|
|
unsigned int syscon;
|
|
|
|
syscon = clps_readl(SYSCON1);
|
|
syscon |= SYSCON1_TC2S | SYSCON1_TC2M;
|
|
clps_writel(syscon, SYSCON1);
|
|
|
|
clps_writel(LATCH-1, TC2D); /* 512kHz / 100Hz - 1 */
|
|
|
|
setup_irq(IRQ_TC2OI, &clps711x_timer_irq);
|
|
|
|
tv.tv_nsec = 0;
|
|
tv.tv_sec = clps_readl(RTCDR);
|
|
do_settimeofday(&tv);
|
|
}
|
|
|
|
struct sys_timer clps711x_timer = {
|
|
.init = clps711x_timer_init,
|
|
.offset = clps711x_gettimeoffset,
|
|
};
|