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/*
* arch/arm/mach-netx/time.c
*
* Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* 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/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/clocksource.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/mach/time.h>
#include <asm/arch/netx-regs.h>
/*
* IRQ handler for the timer
*/
static irqreturn_t
netx_timer_interrupt(int irq, void *dev_id)
{
write_seqlock(&xtime_lock);
timer_tick();
write_sequnlock(&xtime_lock);
/* acknowledge interrupt */
writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
return IRQ_HANDLED;
}
static struct irqaction netx_timer_irq = {
.name = "NetX Timer Tick",
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
.handler = netx_timer_interrupt,
};
cycle_t netx_get_cycles(void)
{
return readl(NETX_GPIO_COUNTER_CURRENT(1));
}
static struct clocksource clocksource_netx = {
.name = "netx_timer",
.rating = 200,
.read = netx_get_cycles,
.mask = CLOCKSOURCE_MASK(32),
.shift = 20,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
/*
* Set up timer interrupt
*/
static void __init netx_timer_init(void)
{
/* disable timer initially */
writel(0, NETX_GPIO_COUNTER_CTRL(0));
/* Reset the timer value to zero */
writel(0, NETX_GPIO_COUNTER_CURRENT(0));
writel(LATCH, NETX_GPIO_COUNTER_MAX(0));
/* acknowledge interrupt */
writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
/* Enable the interrupt in the specific timer register and start timer */
writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE);
writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN,
NETX_GPIO_COUNTER_CTRL(0));
setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq);
/* Setup timer one for clocksource */
writel(0, NETX_GPIO_COUNTER_CTRL(1));
writel(0, NETX_GPIO_COUNTER_CURRENT(1));
writel(0xFFFFFFFF, NETX_GPIO_COUNTER_MAX(1));
writel(NETX_GPIO_COUNTER_CTRL_RUN,
NETX_GPIO_COUNTER_CTRL(1));
clocksource_netx.mult =
clocksource_hz2mult(CLOCK_TICK_RATE, clocksource_netx.shift);
clocksource_register(&clocksource_netx);
}
struct sys_timer netx_timer = {
.init = netx_timer_init,
};
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