1 /* 2 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <mmio.h> 32 #include <sp805.h> 33 #include <stdint.h> 34 35 /* Inline register access functions */ 36 37 static inline void sp805_write_wdog_load(uintptr_t base, unsigned long value) 38 { 39 mmio_write_32(base + SP805_WDOG_LOAD_OFF, value); 40 } 41 42 static inline void sp805_write_wdog_ctrl(uintptr_t base, unsigned long value) 43 { 44 mmio_write_32(base + SP805_WDOG_CTR_OFF, value); 45 } 46 47 static inline void sp805_write_wdog_lock(uintptr_t base, unsigned long value) 48 { 49 mmio_write_32(base + SP805_WDOG_LOCK_OFF, value); 50 } 51 52 53 /* Public API implementation */ 54 55 void sp805_start(uintptr_t base, unsigned long ticks) 56 { 57 sp805_write_wdog_load(base, ticks); 58 sp805_write_wdog_ctrl(base, SP805_CTR_RESEN | SP805_CTR_INTEN); 59 /* Lock registers access */ 60 sp805_write_wdog_lock(base, 0); 61 } 62 63 void sp805_stop(uintptr_t base) 64 { 65 sp805_write_wdog_lock(base, WDOG_UNLOCK_KEY); 66 sp805_write_wdog_ctrl(base, 0); 67 } 68 69 void sp805_refresh(uintptr_t base, unsigned long ticks) 70 { 71 sp805_write_wdog_lock(base, WDOG_UNLOCK_KEY); 72 sp805_write_wdog_load(base, ticks); 73 sp805_write_wdog_lock(base, 0); 74 } 75