include/watchdog.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * (C) Copyright 2001
   4  * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
   5  */
   6
   7 /*
   8  * Watchdog functions and macros.
   9  */
  10 #ifndef _WATCHDOG_H_
  11 #define _WATCHDOG_H_
  12
  13 #if !defined(__ASSEMBLY__)
  14 #include <cyclic.h>
  15
  16 /*
  17  * Reset the watchdog timer, always returns 0
  18  *
  19  * This function is here since it is shared between board_f() and board_r(),
  20  * and the legacy arch/<arch>/board.c code.
  21  */
  22 int init_func_watchdog_reset(void);
  23 #endif
  24
  25 #if defined(CONFIG_WATCHDOG) || defined(CONFIG_HW_WATCHDOG)
  26 #define INIT_FUNC_WATCHDOG_INIT init_func_watchdog_init,
  27 #define INIT_FUNC_WATCHDOG_RESET        init_func_watchdog_reset,
  28 #else
  29 #define INIT_FUNC_WATCHDOG_INIT
  30 #define INIT_FUNC_WATCHDOG_RESET
  31 #endif
  32
  33 #if defined(CONFIG_HW_WATCHDOG) && defined(CONFIG_WATCHDOG)
  34 #  error "Configuration error: CONFIG_HW_WATCHDOG and CONFIG_WATCHDOG can't be used together."
  35 #endif
  36
  37 /*
  38  * Hardware watchdog
  39  */
  40 #ifdef CONFIG_HW_WATCHDOG
  41         #if defined(__ASSEMBLY__)
  42                 #define WATCHDOG_RESET bl hw_watchdog_reset
  43         #else
  44                 extern void hw_watchdog_reset(void);
  45
  46                 #define WATCHDOG_RESET hw_watchdog_reset
  47         #endif /* __ASSEMBLY__ */
  48 #else
  49         /*
  50          * Maybe a software watchdog?
  51          */
  52         #if defined(CONFIG_WATCHDOG)
  53                 #if defined(__ASSEMBLY__)
  54                         /* Don't require the watchdog to be enabled in SPL */
  55                         #if defined(CONFIG_SPL_BUILD) &&                \
  56                                 !defined(CONFIG_SPL_WATCHDOG)
  57                                 #define WATCHDOG_RESET /*XXX DO_NOT_DEL_THIS_COMMENT*/
  58                         #else
  59                                 #define WATCHDOG_RESET bl watchdog_reset
  60                         #endif
  61                 #else
  62                         /* Don't require the watchdog to be enabled in SPL */
  63                         #if defined(CONFIG_SPL_BUILD) &&                \
  64                                 !defined(CONFIG_SPL_WATCHDOG)
  65                                 #define WATCHDOG_RESET() { \
  66                                         cyclic_run(); \
  67                                 }
  68                         #else
  69                                 extern void watchdog_reset(void);
  70
  71                                 #define WATCHDOG_RESET() { \
  72                                         watchdog_reset(); \
  73                                         cyclic_run(); \
  74                                 }
  75                         #endif
  76                 #endif
  77         #else
  78                 /*
  79                  * No hardware or software watchdog.
  80                  */
  81                 #if defined(__ASSEMBLY__)
  82                         #define WATCHDOG_RESET /*XXX DO_NOT_DEL_THIS_COMMENT*/
  83                 #else
  84                         #define WATCHDOG_RESET() { \
  85                                 cyclic_run(); \
  86                         }
  87                 #endif /* __ASSEMBLY__ */
  88         #endif /* CONFIG_WATCHDOG && !__ASSEMBLY__ */
  89 #endif /* CONFIG_HW_WATCHDOG */
  90
  91 #if !defined(__ASSEMBLY__)
  92 /* Currently only needed for fs/cramfs/uncompress.c */
  93 static inline void watchdog_reset_func(void)
  94 {
  95         WATCHDOG_RESET();
  96 }
  97 #endif
  98
  99 /*
 100  * Prototypes from $(CPU)/cpu.c.
 101  */
 102
 103 #if (defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)) && !defined(__ASSEMBLY__)
 104         void hw_watchdog_init(void);
 105 #endif
 106
 107 #if defined(CONFIG_MPC85xx) && !defined(__ASSEMBLY__)
 108         void init_85xx_watchdog(void);
 109 #endif
 110 #endif /* _WATCHDOG_H_ */