summaryrefslogtreecommitdiffstats
path: root/kernel/include/linux/i8253.h
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/include/linux/i8253.h')
-rw-r--r--kernel/include/linux/i8253.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/kernel/include/linux/i8253.h b/kernel/include/linux/i8253.h
new file mode 100644
index 000000000..e6bb36a97
--- /dev/null
+++ b/kernel/include/linux/i8253.h
@@ -0,0 +1,29 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Machine specific IO port address definition for generic.
+ * Written by Osamu Tomita <tomita@cinet.co.jp>
+ */
+#ifndef __LINUX_I8253_H
+#define __LINUX_I8253_H
+
+#include <linux/param.h>
+#include <linux/spinlock.h>
+#include <linux/timex.h>
+
+/* i8253A PIT registers */
+#define PIT_MODE 0x43
+#define PIT_CH0 0x40
+#define PIT_CH2 0x42
+
+#define PIT_LATCH ((PIT_TICK_RATE + HZ/2) / HZ)
+
+extern raw_spinlock_t i8253_lock;
+extern struct clock_event_device i8253_clockevent;
+extern void clockevent_i8253_init(bool oneshot);
+
+extern void setup_pit_timer(void);
+
+#endif /* __LINUX_I8253_H */