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authorJuan Castillo <juan.castillo@arm.com>2014-07-08 17:20:41 +0100
committerJuan Castillo <juan.castillo@arm.com>2015-11-27 09:34:20 +0000
commit380419738304533366ebc9fd3462351215fd0c6f (patch)
tree9b52afe82c395da11f15614c7f370b26f886bf02 /include/drivers/arm/sp805.h
parent9784dbda1147458598f1d586d8242332ada19b44 (diff)
downloadtrusted-firmware-a-380419738304533366ebc9fd3462351215fd0c6f.tar.gz
Add a simple ARM SP805 watchdog driver
Based on SP805 Programmer's model (ARM DDI 0270B). This driver provides three public APIs: void sp805_start(uintptr_t base, unsigned long ticks); void sp805_stop(uintptr_t base); void sp805_refresh(uintptr_t base, unsigned long ticks); Upon start, the watchdog starts counting down from the number of ticks specified. When the count reaches 0 an interrupt is triggered. The watchdog restarts counting down from the number of ticks specified. If the count reaches 0 again, the system is reset. A mechanism to handle the interrupt has not been implemented. Instead, the API to refresh the watchdog should be used instead to prevent a system reset. Change-Id: I799d53f8d1213b10b341a4a67fde6486e89a3dab
Diffstat (limited to 'include/drivers/arm/sp805.h')
-rw-r--r--include/drivers/arm/sp805.h58
1 files changed, 58 insertions, 0 deletions
diff --git a/include/drivers/arm/sp805.h b/include/drivers/arm/sp805.h
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+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __SP805_H__
+#define __SP805_H__
+
+/* SP805 register offset */
+#define SP805_WDOG_LOAD_OFF 0x000
+#define SP805_WDOG_CTR_OFF 0x008
+#define SP805_WDOG_LOCK_OFF 0xc00
+
+/* Magic word to unlock the wd registers */
+#define WDOG_UNLOCK_KEY 0x1ACCE551
+
+/* Register field definitions */
+#define SP805_CTR_RESEN (1 << 1)
+#define SP805_CTR_INTEN (1 << 0)
+
+#ifndef __ASSEMBLY__
+
+#include <stdint.h>
+
+/* Public high level API */
+
+void sp805_start(uintptr_t base, unsigned long ticks);
+void sp805_stop(uintptr_t base);
+void sp805_refresh(uintptr_t base, unsigned long ticks);
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __SP805_H__ */