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author | Juan Castillo <juan.castillo@arm.com> | 2014-07-08 17:20:41 +0100 |
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committer | Juan Castillo <juan.castillo@arm.com> | 2015-11-27 09:34:20 +0000 |
commit | 380419738304533366ebc9fd3462351215fd0c6f (patch) | |
tree | 9b52afe82c395da11f15614c7f370b26f886bf02 /include/drivers/arm/sp805.h | |
parent | 9784dbda1147458598f1d586d8242332ada19b44 (diff) | |
download | trusted-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.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/include/drivers/arm/sp805.h b/include/drivers/arm/sp805.h new file mode 100644 index 0000000000..6bd8158731 --- /dev/null +++ b/include/drivers/arm/sp805.h @@ -0,0 +1,58 @@ +/* + * 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__ */ |