diff --git a/drivers/arm/sp805/sp805.c b/drivers/arm/sp805/sp805.c new file mode 100644 index 0000000..4886e01 --- /dev/null +++ b/drivers/arm/sp805/sp805.c @@ -0,0 +1,74 @@ +/* + * 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. + */ + +#include +#include +#include + +/* Inline register access functions */ + +static inline void sp805_write_wdog_load(uintptr_t base, unsigned long value) +{ + mmio_write_32(base + SP805_WDOG_LOAD_OFF, value); +} + +static inline void sp805_write_wdog_ctrl(uintptr_t base, unsigned long value) +{ + mmio_write_32(base + SP805_WDOG_CTR_OFF, value); +} + +static inline void sp805_write_wdog_lock(uintptr_t base, unsigned long value) +{ + mmio_write_32(base + SP805_WDOG_LOCK_OFF, value); +} + + +/* Public API implementation */ + +void sp805_start(uintptr_t base, unsigned long ticks) +{ + sp805_write_wdog_load(base, ticks); + sp805_write_wdog_ctrl(base, SP805_CTR_RESEN | SP805_CTR_INTEN); + /* Lock registers access */ + sp805_write_wdog_lock(base, 0); +} + +void sp805_stop(uintptr_t base) +{ + sp805_write_wdog_lock(base, WDOG_UNLOCK_KEY); + sp805_write_wdog_ctrl(base, 0); +} + +void sp805_refresh(uintptr_t base, unsigned long ticks) +{ + sp805_write_wdog_lock(base, WDOG_UNLOCK_KEY); + sp805_write_wdog_load(base, ticks); + sp805_write_wdog_lock(base, 0); +} diff --git a/include/drivers/arm/sp805.h b/include/drivers/arm/sp805.h new file mode 100644 index 0000000..6bd8158 --- /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 + +/* 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__ */