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[ARM] 4013/1: clocksource driver for netx 

Add a clocksource driver for netx systems

Signed-off-by: Luotao Fu <lfu@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
hifive-unleashed-5.1
Sascha Hauer 2006-12-12 09:23:45 +01:00 committed by Russell King
parent c80204e5d6
commit 1a815aed1e
1 changed files with 30 additions and 12 deletions
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42
arch/arm/mach-netx/time.c
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@ -19,21 +19,14 @@
#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>
/*
* Returns number of us since last clock interrupt. Note that interrupts
* will have been disabled by do_gettimeoffset()
*/
static unsigned long netx_gettimeoffset(void)
{
return readl(NETX_GPIO_COUNTER_CURRENT(0)) / 100;
}
/*
* IRQ handler for the timer
*/
@ -43,6 +36,7 @@ netx_timer_interrupt(int irq, void *dev_id)
write_seqlock(&xtime_lock);
timer_tick();
write_sequnlock(&xtime_lock);
/* acknowledge interrupt */
@ -51,13 +45,26 @@ netx_timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
static struct irqaction netx_timer_irq = {
.name = "NetX Timer Tick",
.flags = IRQF_DISABLED | IRQF_TIMER,
.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,
.is_continuous = 1,
};
/*
* Set up timer interrupt
*/
@ -80,9 +87,20 @@ static void __init netx_timer_init(void)
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,
.offset = netx_gettimeoffset,
.init = netx_timer_init,
};