#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/clocksource.h>
+#include <linux/clockchips.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/mach/time.h>
#include <mach/netx-regs.h>
+#define TIMER_CLOCKEVENT 0
+#define TIMER_CLOCKSOURCE 1
+
+static void netx_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *clk)
+{
+ u32 tmode;
+
+ /* disable timer */
+ writel(0, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKEVENT));
+
+ switch (mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ writel(LATCH, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKEVENT));
+ tmode = NETX_GPIO_COUNTER_CTRL_RST_EN |
+ NETX_GPIO_COUNTER_CTRL_IRQ_EN |
+ NETX_GPIO_COUNTER_CTRL_RUN;
+ break;
+
+ case CLOCK_EVT_MODE_ONESHOT:
+ writel(0, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKEVENT));
+ tmode = NETX_GPIO_COUNTER_CTRL_IRQ_EN |
+ NETX_GPIO_COUNTER_CTRL_RUN;
+ break;
+
+ default:
+ WARN(1, "%s: unhandled mode %d\n", __func__, mode);
+ /* fall through */
+
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_RESUME:
+ tmode = 0;
+ break;
+ }
+
+ writel(tmode, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKEVENT));
+}
+
+static int netx_set_next_event(unsigned long evt,
+ struct clock_event_device *clk)
+{
+ writel(0 - evt, NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKEVENT));
+ return 0;
+}
+
+static struct clock_event_device netx_clockevent = {
+ .name = "netx-timer" __stringify(TIMER_CLOCKEVENT),
+ .shift = 32,
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .set_next_event = netx_set_next_event,
+ .set_mode = netx_set_mode,
+};
+
/*
* IRQ handler for the timer
*/
static irqreturn_t
netx_timer_interrupt(int irq, void *dev_id)
{
- timer_tick();
+ struct clock_event_device *evt = &netx_clockevent;
/* acknowledge interrupt */
writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
+ evt->event_handler(evt);
+
return IRQ_HANDLED;
}
static struct irqaction netx_timer_irq = {
- .name = "NetX Timer Tick",
- .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
- .handler = netx_timer_interrupt,
+ .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));
+ return readl(NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKSOURCE));
}
static struct clocksource clocksource_netx = {
- .name = "netx_timer",
+ .name = "netx_timer",
.rating = 200,
.read = netx_get_cycles,
.mask = CLOCKSOURCE_MASK(32),
- .shift = 20,
+ .shift = 20,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
/* 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(TIMER_CLOCKSOURCE));
+ writel(0, NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKSOURCE));
+ writel(0xffffffff, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKSOURCE));
- writel(NETX_GPIO_COUNTER_CTRL_RUN,
- NETX_GPIO_COUNTER_CTRL(1));
+ writel(NETX_GPIO_COUNTER_CTRL_RUN,
+ NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKSOURCE));
clocksource_netx.mult =
clocksource_hz2mult(CLOCK_TICK_RATE, clocksource_netx.shift);
clocksource_register(&clocksource_netx);
+
+ netx_clockevent.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC,
+ netx_clockevent.shift);
+ netx_clockevent.max_delta_ns =
+ clockevent_delta2ns(0xfffffffe, &netx_clockevent);
+ /* with max_delta_ns >= delta2ns(0x800) the system currently runs fine.
+ * Adding some safety ... */
+ netx_clockevent.min_delta_ns =
+ clockevent_delta2ns(0xa00, &netx_clockevent);
+ netx_clockevent.cpumask = cpumask_of_cpu(0);
+ clockevents_register_device(&netx_clockevent);
}
struct sys_timer netx_timer = {
projects / linux-2.6-omap-h63xx.git / commitdiff