1 /* 2 * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <stdint.h> 8 9 #include <drivers/arm/sp805.h> 10 #include <lib/mmio.h> 11 12 /* Inline register access functions */ 13 14 static inline void sp805_write_wdog_load(uintptr_t base, uint32_t value) 15 { 16 mmio_write_32(base + SP805_WDOG_LOAD_OFF, value); 17 } 18 19 static inline void sp805_write_wdog_ctrl(uintptr_t base, uint32_t value) 20 { 21 mmio_write_32(base + SP805_WDOG_CTR_OFF, value); 22 } 23 24 static inline void sp805_write_wdog_lock(uintptr_t base, uint32_t value) 25 { 26 mmio_write_32(base + SP805_WDOG_LOCK_OFF, value); 27 } 28 29 30 /* Public API implementation */ 31 32 void sp805_start(uintptr_t base, unsigned int ticks) 33 { 34 sp805_write_wdog_load(base, ticks); 35 sp805_write_wdog_ctrl(base, SP805_CTR_RESEN | SP805_CTR_INTEN); 36 /* Lock registers access */ 37 sp805_write_wdog_lock(base, 0U); 38 } 39 40 void sp805_stop(uintptr_t base) 41 { 42 sp805_write_wdog_lock(base, WDOG_UNLOCK_KEY); 43 sp805_write_wdog_ctrl(base, 0U); 44 } 45 46 void sp805_refresh(uintptr_t base, unsigned int ticks) 47 { 48 sp805_write_wdog_lock(base, WDOG_UNLOCK_KEY); 49 sp805_write_wdog_load(base, ticks); 50 sp805_write_wdog_lock(base, 0U); 51 } 52