#include <linux/jiffies.h>
#include <linux/percpu.h>
#include <linux/clockchips.h>
+#include <linux/irq.h>
+#include <linux/io.h>
-#include <asm/mach/time.h>
#include <asm/hardware/arm_twd.h>
#include <asm/hardware/gic.h>
-#include <asm/hardware.h>
-#include <asm/io.h>
+#include <mach/hardware.h>
#include <asm/irq.h>
-#define TWD_BASE(cpu) (__io_address(REALVIEW_TWD_BASE) + \
- ((cpu) * REALVIEW_TWD_SIZE))
-
static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);
/*
#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.
*
*/
int local_timer_ack(void)
{
- void __iomem *base = TWD_BASE(smp_processor_id());
-
- if (__raw_readl(base + TWD_TIMER_INTSTAT)) {
- __raw_writel(1, base + TWD_TIMER_INTSTAT);
+ if (__raw_readl(twd_base + TWD_TIMER_INTSTAT)) {
+ __raw_writel(1, twd_base + TWD_TIMER_INTSTAT);
return 1;
}
return 0;
}
-void __cpuinit local_timer_setup(unsigned int cpu)
+static void __cpuinit twd_calibrate_rate(void)
{
- void __iomem *base = TWD_BASE(cpu);
- unsigned int load, offset;
+ unsigned long load, count;
u64 waitjiffies;
- unsigned int count;
/*
* If this is the first time round, we need to work out how fast
waitjiffies += 5;
/* enable, no interrupt or reload */
- __raw_writel(0x1, base + TWD_TIMER_CONTROL);
+ __raw_writel(0x1, twd_base + TWD_TIMER_CONTROL);
/* maximum value */
- __raw_writel(0xFFFFFFFFU, base + TWD_TIMER_COUNTER);
+ __raw_writel(0xFFFFFFFFU, twd_base + TWD_TIMER_COUNTER);
while (get_jiffies_64() < waitjiffies)
udelay(10);
- count = __raw_readl(base + TWD_TIMER_COUNTER);
+ count = __raw_readl(twd_base + TWD_TIMER_COUNTER);
mpcore_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);
load = mpcore_timer_rate / HZ;
- __raw_writel(load, base + TWD_TIMER_LOAD);
- __raw_writel(0x7, base + TWD_TIMER_CONTROL);
-
- /*
- * Now maneuver our local tick into the right part of the jiffy.
- * Start by working out where within the tick our local timer
- * interrupt should go.
- */
- offset = ((mpcore_timer_rate / HZ) / (NR_CPUS + 1)) * (cpu + 1);
-
- /*
- * gettimeoffset() will return a number of us since the last tick.
- * Convert this number of us to a local timer tick count.
- * Be careful of integer overflow whilst keeping maximum precision.
- *
- * with HZ=100 and 1MHz (fpga) ~ 1GHz processor:
- * load = 1 ~ 10,000
- * mpcore_timer_rate/10000 = 100 ~ 100,000
- *
- * so the multiply value will be less than 10^9 always.
- */
- load = (system_timer->offset() * (mpcore_timer_rate / 10000)) / 100;
-
- /* Add on our offset to get the load value */
- load = (load + offset) % (mpcore_timer_rate / HZ);
+ __raw_writel(load, twd_base + TWD_TIMER_LOAD);
+}
- __raw_writel(load, base + TWD_TIMER_COUNTER);
+/*
+ * 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 */
- __raw_writel(1 << IRQ_LOCALTIMER,
- __io_address(REALVIEW_GIC_DIST_BASE) + GIC_DIST_ENABLE_SET);
+ 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(unsigned int cpu)
+void __cpuexit local_timer_stop(void)
{
- __raw_writel(0, TWD_BASE(cpu) + TWD_TIMER_CONTROL);
+ __raw_writel(0, twd_base + TWD_TIMER_CONTROL);
}
#else /* CONFIG_LOCAL_TIMERS */
{
}
-void __cpuinit local_timer_setup(unsigned int cpu)
+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_DUMMY;
- clk->rating = 200;
+ 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(cpu);
+ clk->cpumask = cpumask_of(cpu);
clockevents_register_device(clk);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff