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