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authorVitja Makarov <vitja.makarov@gmail.com>2008-02-29 12:24:23 +0800
committerBryan Wu <cooloney@kernel.org>2008-02-29 12:24:23 +0800
commit8b5f79f9d7ee4f4edb0212886771c977476eb811 (patch)
tree5c9928710ad8c2556b64cee56fea768ce5ac4ba7 /arch/blackfin/kernel/process.c
parent3dc5063786b273f1aee545844f6bd4e9651ebffe (diff)
downloadlinux-8b5f79f9d7ee4f4edb0212886771c977476eb811.tar.bz2
[Blackfin] arch: initial generic time and clock sources
This patch enables Hight-Res Timers and tickless kernel Signed-off-by: Vitja Makarov <vitja.makarov@gmail.com> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin/kernel/process.c')
-rw-r--r--arch/blackfin/kernel/process.c43
1 files changed, 28 insertions, 15 deletions
diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
index 6b8459c66163..6dedb2da8b67 100644
--- a/arch/blackfin/kernel/process.c
+++ b/arch/blackfin/kernel/process.c
@@ -32,6 +32,8 @@
#include <linux/unistd.h>
#include <linux/user.h>
#include <linux/uaccess.h>
+#include <linux/sched.h>
+#include <linux/tick.h>
#include <linux/fs.h>
#include <linux/err.h>
@@ -69,33 +71,44 @@ EXPORT_SYMBOL(pm_power_off);
* The idle loop on BFIN
*/
#ifdef CONFIG_IDLE_L1
-void default_idle(void)__attribute__((l1_text));
+static void default_idle(void)__attribute__((l1_text));
void cpu_idle(void)__attribute__((l1_text));
#endif
-void default_idle(void)
+/*
+ * This is our default idle handler. We need to disable
+ * interrupts here to ensure we don't miss a wakeup call.
+ */
+static void default_idle(void)
{
- while (!need_resched()) {
- local_irq_disable();
- if (likely(!need_resched()))
- idle_with_irq_disabled();
- local_irq_enable();
- }
-}
+ local_irq_disable();
+ if (!need_resched())
+ idle_with_irq_disabled();
-void (*idle)(void) = default_idle;
+ local_irq_enable();
+}
/*
- * The idle thread. There's no useful work to be
- * done, so just try to conserve power and have a
- * low exit latency (ie sit in a loop waiting for
- * somebody to say that they'd like to reschedule)
+ * The idle thread. We try to conserve power, while trying to keep
+ * overall latency low. The architecture specific idle is passed
+ * a value to indicate the level of "idleness" of the system.
*/
void cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
- idle();
+ void (*idle)(void) = pm_idle;
+
+#ifdef CONFIG_HOTPLUG_CPU
+ if (cpu_is_offline(smp_processor_id()))
+ cpu_die();
+#endif
+ if (!idle)
+ idle = default_idle;
+ tick_nohz_stop_sched_tick();
+ while (!need_resched())
+ idle();
+ tick_nohz_restart_sched_tick();
preempt_enable_no_resched();
schedule();
preempt_disable();