Add a clockevent driver for netx systems
Signed-off-by: Luotao Fu <[email protected]>
Signed-off-by: Sascha Hauer <[email protected]>
---
arch/arm/mach-netx/time.c | 80 ++++++++++++++++++++++++++++++++++++----------
1 file changed, 64 insertions(+), 16 deletions(-)
Index: arch/arm/mach-netx/time.c
===================================================================
--- a/arch/arm/mach-netx/time.c.orig
+++ b/arch/arm/mach-netx/time.c
@@ -21,27 +21,65 @@
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/clocksource.h>
+#include <linux/clockchips.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/mach/time.h>
#include <asm/arch/netx-regs.h>
+static void netx_set_next_event(unsigned long evt,
+ struct clock_event_device *unused)
+{
+ writel(0 - evt, NETX_GPIO_COUNTER_CURRENT(0));
+}
+
+static void netx_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+ u32 tmode = NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN;
+
+ /* disable timer */
+ writel( 0, NETX_GPIO_COUNTER_CTRL(0));
+
+ switch(mode) {
+ case CLOCK_EVT_PERIODIC:
+ /* Set timer period */
+ writel(LATCH, NETX_GPIO_COUNTER_MAX(0));
+ tmode |= NETX_GPIO_COUNTER_CTRL_RST_EN;
+ break;
+
+ case CLOCK_EVT_ONESHOT:
+ writel(0, NETX_GPIO_COUNTER_MAX(0));
+ break;
+
+ case CLOCK_EVT_SHUTDOWN:
+ return;
+ }
+
+ writel(tmode, NETX_GPIO_COUNTER_CTRL(0));
+}
+
+static struct clock_event_device clockevent_netx = {
+ .name = "netx_timer1",
+ .capabilities = CLOCK_CAP_NEXTEVT | CLOCK_CAP_TICK |
+ CLOCK_CAP_UPDATE | CLOCK_CAP_PROFILE,
+ .shift = 32,
+ .set_mode = netx_set_mode,
+ .set_next_event = netx_set_next_event,
+};
+
/*
* 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);
+ clockevent_netx.event_handler();
+
return IRQ_HANDLED;
}
@@ -57,12 +95,12 @@ cycle_t netx_get_cycles(void)
}
static struct clocksource clocksource_netx = {
- .name = "netx_timer",
+ .name = "netx_timer",
.rating = 200,
.read = netx_get_cycles,
.mask = CLOCKSOURCE_MASK(32),
- .shift = 20,
- .is_continuous = 1,
+ .shift = 20,
+ .is_continuous = 1,
};
/*
@@ -81,24 +119,34 @@ static void __init netx_timer_init(void)
/* acknowledge interrupt */
writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
- /* Enable the interrupt in the specific timer register and start timer */
+ /* 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));
+ 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(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));
+ 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);
+
+ clockevent_netx.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC,
+ clockevent_netx.shift);
+ clockevent_netx.max_delta_ns =
+ clockevent_delta2ns(0xfffffffe, &clockevent_netx);
+ clockevent_netx.min_delta_ns =
+ clockevent_delta2ns(0xf, &clockevent_netx);
+ register_local_clockevent(&clockevent_netx);
}
struct sys_timer netx_timer = {
--
Dipl.-Ing. Sascha Hauer | http://www.pengutronix.de
Pengutronix - Linux Solutions for Science and Industry
Handelsregister: Amtsgericht Hildesheim, HRA 2686
Hannoversche Str. 2, 31134 Hildesheim, Germany
Phone: +49-5121-206917-0 | Fax: +49-5121-206917-9
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