1 files changed, 66 insertions, 0 deletions
diff --git a/arch/sh/include/cpu-sh2/cpu/watchdog.h b/arch/sh/include/cpu-sh2/cpu/watchdog.h
new file mode 100644
index 000000000..141fe296d
--- /dev/null
+++ b/arch/sh/include/cpu-sh2/cpu/watchdog.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * include/asm-sh/cpu-sh2/watchdog.h
+ *
+ * Copyright (C) 2002, 2003 Paul Mundt
+ */
+#ifndef __ASM_CPU_SH2_WATCHDOG_H
+#define __ASM_CPU_SH2_WATCHDOG_H
+
+/*
+ * More SH-2 brilliance .. its not good enough that we can't read
+ * and write the same sizes to WTCNT, now we have to read and write
+ * with different sizes at different addresses for WTCNT _and_ RSTCSR.
+ *
+ * At least on the bright side no one has managed to screw over WTCSR
+ * in this fashion .. yet.
+ */
+/* Register definitions */
+#define WTCNT		0xfffffe80
+#define WTCSR		0xfffffe80
+#define RSTCSR		0xfffffe82
+
+#define WTCNT_R		(WTCNT + 1)
+#define RSTCSR_R	(RSTCSR + 1)
+
+/* Bit definitions */
+#define WTCSR_IOVF	0x80
+#define WTCSR_WT	0x40
+#define WTCSR_TME	0x20
+#define WTCSR_RSTS	0x00
+
+#define RSTCSR_RSTS	0x20
+
+/**
+ * 	sh_wdt_read_rstcsr - Read from Reset Control/Status Register
+ *
+ *	Reads back the RSTCSR value.
+ */
+static inline __u8 sh_wdt_read_rstcsr(void)
+{
+	/*
+	 * Same read/write brain-damage as for WTCNT here..
+	 */
+	return __raw_readb(RSTCSR_R);
+}
+
+/**
+ * 	sh_wdt_write_csr - Write to Reset 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_rstcsr(__u8 val)
+{
+	/*
+	 * Note: Due to the brain-damaged nature of this register,
+	 * we can't presently touch the WOVF bit, since the upper byte
+	 * has to be swapped for this. So just leave it alone..
+	 */
+	__raw_writeb((WTCNT_HIGH << 8) | (__u16)val, RSTCSR);
+}
+
+#endif /* __ASM_CPU_SH2_WATCHDOG_H */
+