summaryrefslogtreecommitdiff
path: root/drivers/clocksource/i8253.c
diff options
context:
space:
mode:
authorRalf Baechle <ralf@linux-mips.org>2011-06-01 19:04:59 +0100
committerThomas Gleixner <tglx@linutronix.de>2011-06-09 15:01:38 +0200
commit15f304b664c0d0a3e76ed3a9ce3615a86908babe (patch)
tree5203cc0ce3981a7055003e04dc7d9aab56457e48 /drivers/clocksource/i8253.c
parentcb2455aa274b780802c593fecf115240a655d809 (diff)
i8253: Consolidate all kernel definitions of i8253_lock
Move them to drivers/clocksource/i8253.c and remove the implementations in arch/ [ tglx: Avoid the extra file in lib - folded arch patches in. The export will become conditional in a later step ] Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Link: http://lkml.kernel.org/r/20110601180610.221426078@duck.linux-mips.net Cc: Russell King <linux@arm.linux.org.uk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/clocksource/i8253.c')
-rw-r--r--drivers/clocksource/i8253.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/clocksource/i8253.c b/drivers/clocksource/i8253.c
index 33735ebd2dcc..e594f52eb88e 100644
--- a/drivers/clocksource/i8253.c
+++ b/drivers/clocksource/i8253.c
@@ -6,10 +6,20 @@
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/timex.h>
-
+#include <linux/module.h>
#include <linux/i8253.h>
/*
+ * Protects access to I/O ports
+ *
+ * 0040-0043 : timer0, i8253 / i8254
+ * 0061-0061 : NMI Control Register which contains two speaker control bits.
+ */
+DEFINE_RAW_SPINLOCK(i8253_lock);
+EXPORT_SYMBOL(i8253_lock);
+
+#ifdef CONFIG_CLKSRC_I8253
+/*
* Since the PIT overflows every tick, its not very useful
* to just read by itself. So use jiffies to emulate a free
* running counter:
@@ -86,3 +96,4 @@ int __init clocksource_i8253_init(void)
{
return clocksource_register_hz(&i8253_cs, PIT_TICK_RATE);
}
+#endif