* published by the Free Software Foundation.
*/
#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/device.h>
#include <linux/smp.h>
-#include <linux/jiffies.h>
-#include <linux/percpu.h>
#include <linux/clockchips.h>
-#include <linux/irq.h>
-#include <linux/io.h>
-#include <asm/hardware/arm_twd.h>
-#include <asm/hardware/gic.h>
-#include <mach/hardware.h>
#include <asm/irq.h>
-
-static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);
-
-/*
- * Used on SMP for either the local timer or IPI_TIMER
- */
-void local_timer_interrupt(void)
-{
- struct clock_event_device *clk = &__get_cpu_var(local_clockevent);
-
- clk->event_handler(clk);
-}
-
-#ifdef CONFIG_LOCAL_TIMERS
-
-/* set up by the platform code */
-void __iomem *twd_base;
-
-static unsigned long mpcore_timer_rate;
-
-static void local_timer_set_mode(enum clock_event_mode mode,
- struct clock_event_device *clk)
-{
- unsigned long ctrl;
-
- switch(mode) {
- case CLOCK_EVT_MODE_PERIODIC:
- /* timer load already set up */
- ctrl = TWD_TIMER_CONTROL_ENABLE | TWD_TIMER_CONTROL_IT_ENABLE
- | TWD_TIMER_CONTROL_PERIODIC;
- break;
- case CLOCK_EVT_MODE_ONESHOT:
- /* period set, and timer enabled in 'next_event' hook */
- ctrl = TWD_TIMER_CONTROL_IT_ENABLE | TWD_TIMER_CONTROL_ONESHOT;
- break;
- case CLOCK_EVT_MODE_UNUSED:
- case CLOCK_EVT_MODE_SHUTDOWN:
- default:
- ctrl = 0;
- }
-
- __raw_writel(ctrl, twd_base + TWD_TIMER_CONTROL);
-}
-
-static int local_timer_set_next_event(unsigned long evt,
- struct clock_event_device *unused)
-{
- unsigned long ctrl = __raw_readl(twd_base + TWD_TIMER_CONTROL);
-
- __raw_writel(evt, twd_base + TWD_TIMER_COUNTER);
- __raw_writel(ctrl | TWD_TIMER_CONTROL_ENABLE, twd_base + TWD_TIMER_CONTROL);
-
- return 0;
-}
-
-/*
- * local_timer_ack: checks for a local timer interrupt.
- *
- * If a local timer interrupt has occurred, acknowledge and return 1.
- * Otherwise, return 0.
- */
-int local_timer_ack(void)
-{
- if (__raw_readl(twd_base + TWD_TIMER_INTSTAT)) {
- __raw_writel(1, twd_base + TWD_TIMER_INTSTAT);
- return 1;
- }
-
- return 0;
-}
-
-static void __cpuinit twd_calibrate_rate(void)
-{
- unsigned long load, count;
- u64 waitjiffies;
-
- /*
- * If this is the first time round, we need to work out how fast
- * the timer ticks
- */
- if (mpcore_timer_rate == 0) {
- printk("Calibrating local timer... ");
-
- /* Wait for a tick to start */
- waitjiffies = get_jiffies_64() + 1;
-
- while (get_jiffies_64() < waitjiffies)
- udelay(10);
-
- /* OK, now the tick has started, let's get the timer going */
- waitjiffies += 5;
-
- /* enable, no interrupt or reload */
- __raw_writel(0x1, twd_base + TWD_TIMER_CONTROL);
-
- /* maximum value */
- __raw_writel(0xFFFFFFFFU, twd_base + TWD_TIMER_COUNTER);
-
- while (get_jiffies_64() < waitjiffies)
- udelay(10);
-
- count = __raw_readl(twd_base + TWD_TIMER_COUNTER);
-
- mpcore_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);
-
- printk("%lu.%02luMHz.\n", mpcore_timer_rate / 1000000,
- (mpcore_timer_rate / 100000) % 100);
- }
-
- load = mpcore_timer_rate / HZ;
-
- __raw_writel(load, twd_base + TWD_TIMER_LOAD);
-}
+#include <asm/smp_twd.h>
+#include <asm/localtimer.h>
/*
* Setup the local clock events for a CPU.
*/
-void __cpuinit local_timer_setup(void)
-{
- unsigned int cpu = smp_processor_id();
- struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
- unsigned long flags;
-
- twd_calibrate_rate();
-
- clk->name = "local_timer";
- clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
- clk->rating = 350;
- clk->set_mode = local_timer_set_mode;
- clk->set_next_event = local_timer_set_next_event;
- clk->irq = IRQ_LOCALTIMER;
- clk->cpumask = cpumask_of(cpu);
- clk->shift = 20;
- clk->mult = div_sc(mpcore_timer_rate, NSEC_PER_SEC, clk->shift);
- clk->max_delta_ns = clockevent_delta2ns(0xffffffff, clk);
- clk->min_delta_ns = clockevent_delta2ns(0xf, clk);
-
- /* Make sure our local interrupt controller has this enabled */
- local_irq_save(flags);
- get_irq_chip(IRQ_LOCALTIMER)->unmask(IRQ_LOCALTIMER);
- local_irq_restore(flags);
-
- clockevents_register_device(clk);
-}
-
-/*
- * take a local timer down
- */
-void __cpuexit local_timer_stop(void)
+void __cpuinit local_timer_setup(struct clock_event_device *evt)
{
- __raw_writel(0, twd_base + TWD_TIMER_CONTROL);
+ evt->irq = IRQ_LOCALTIMER;
+ twd_timer_setup(evt);
}
-
-#else /* CONFIG_LOCAL_TIMERS */
-
-static void dummy_timer_set_mode(enum clock_event_mode mode,
- struct clock_event_device *clk)
-{
-}
-
-void __cpuinit local_timer_setup(void)
-{
- unsigned int cpu = smp_processor_id();
- struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
-
- clk->name = "dummy_timer";
- clk->features = CLOCK_EVT_FEAT_ONESHOT |
- CLOCK_EVT_FEAT_PERIODIC |
- CLOCK_EVT_FEAT_DUMMY;
- clk->rating = 400;
- clk->mult = 1;
- clk->set_mode = dummy_timer_set_mode;
- clk->broadcast = smp_timer_broadcast;
- clk->cpumask = cpumask_of(cpu);
-
- clockevents_register_device(clk);
-}
-
-#endif /* !CONFIG_LOCAL_TIMERS */
git.openpandora.org / pandora-kernel.git / blobdiff