1 files changed, 107 insertions, 0 deletions
diff --git a/arch/sh/include/asm/watchdog.h b/arch/sh/include/asm/watchdog.h
new file mode 100644
index 000000000000..f024fed00a72
--- /dev/null
+++ b/arch/sh/include/asm/watchdog.h
@@ -0,0 +1,107 @@
+/*
+ * include/asm-sh/watchdog.h
+ *
+ * Copyright (C) 2002, 2003 Paul Mundt
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+#ifndef __ASM_SH_WATCHDOG_H
+#define __ASM_SH_WATCHDOG_H
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <cpu/watchdog.h>
+#include <asm/io.h>
+
+/* 
+ * See cpu-sh2/watchdog.h for explanation of this stupidity..
+ */
+#ifndef WTCNT_R
+#  define WTCNT_R	WTCNT
+#endif
+
+#ifndef WTCSR_R
+#  define WTCSR_R	WTCSR
+#endif
+
+#define WTCNT_HIGH	0x5a
+#define WTCSR_HIGH	0xa5
+
+#define WTCSR_CKS2	0x04
+#define WTCSR_CKS1	0x02
+#define WTCSR_CKS0	0x01
+
+/*
+ * CKS0-2 supports a number of clock division ratios. At the time the watchdog
+ * is enabled, it defaults to a 41 usec overflow period .. we overload this to
+ * something a little more reasonable, and really can't deal with anything
+ * lower than WTCSR_CKS_1024, else we drop back into the usec range.
+ *
+ * Clock Division Ratio         Overflow Period
+ * --------------------------------------------
+ *     1/32 (initial value)       41 usecs
+ *     1/64                       82 usecs
+ *     1/128                     164 usecs
+ *     1/256                     328 usecs
+ *     1/512                     656 usecs
+ *     1/1024                   1.31 msecs
+ *     1/2048                   2.62 msecs
+ *     1/4096                   5.25 msecs
+ */
+#define WTCSR_CKS_32	0x00
+#define WTCSR_CKS_64	0x01
+#define WTCSR_CKS_128	0x02
+#define WTCSR_CKS_256	0x03
+#define WTCSR_CKS_512	0x04
+#define WTCSR_CKS_1024	0x05
+#define WTCSR_CKS_2048	0x06
+#define WTCSR_CKS_4096	0x07
+
+/**
+ * 	sh_wdt_read_cnt - Read from Counter
+ * 	Reads back the WTCNT value.
+ */
+static inline __u8 sh_wdt_read_cnt(void)
+{
+	return ctrl_inb(WTCNT_R);
+}
+
+/**
+ *	sh_wdt_write_cnt - Write to Counter
+ *	@val: Value to write
+ *
+ *	Writes the given value @val to the lower byte of the timer counter.
+ *	The upper byte is set manually on each write.
+ */
+static inline void sh_wdt_write_cnt(__u8 val)
+{
+	ctrl_outw((WTCNT_HIGH << 8) | (__u16)val, WTCNT);
+}
+
+/**
+ * 	sh_wdt_read_csr - Read from Control/Status Register
+ *
+ *	Reads back the WTCSR value.
+ */
+static inline __u8 sh_wdt_read_csr(void)
+{
+	return ctrl_inb(WTCSR_R);
+}
+
+/**
+ * 	sh_wdt_write_csr - Write to Control/Status Register
+ * 	@val: Value to write
+ *
+ * 	Writes the given value @val to the lower byte of the control/status
+ * 	register. The upper byte is set manually on each write.
+ */
+static inline void sh_wdt_write_csr(__u8 val)
+{
+	ctrl_outw((WTCSR_HIGH << 8) | (__u16)val, WTCSR);
+}
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_SH_WATCHDOG_H */