drivers/arm/sp805/sp805.c

   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 <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, uint32_t 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, uint32_t 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, uint32_t 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 int 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, 0U);
  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, 0U);
  43 }
  44
  45 void sp805_refresh(uintptr_t base, unsigned int ticks)
  46 {
  47         sp805_write_wdog_lock(base, WDOG_UNLOCK_KEY);
  48         sp805_write_wdog_load(base, ticks);
  49         sp805_write_wdog_lock(base, 0U);
  50 }