summaryrefslogtreecommitdiff
path: root/include/asm-sh/cpu-sh2/watchdog.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-sh/cpu-sh2/watchdog.h')
-rw-r--r--include/asm-sh/cpu-sh2/watchdog.h69
1 files changed, 69 insertions, 0 deletions
diff --git a/include/asm-sh/cpu-sh2/watchdog.h b/include/asm-sh/cpu-sh2/watchdog.h
new file mode 100644
index 000000000000..393161c9c6d0
--- /dev/null
+++ b/include/asm-sh/cpu-sh2/watchdog.h
@@ -0,0 +1,69 @@
+/*
+ * include/asm-sh/cpu-sh2/watchdog.h
+ *
+ * Copyright (C) 2002, 2003 Paul Mundt
+ *
+ * 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.
+ */
+#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 ctrl_inb(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..
+ */
+ ctrl_outw((WTCNT_HIGH << 8) | (__u16)val, RSTCSR);
+}
+
+#endif /* __ASM_CPU_SH2_WATCHDOG_H */
+