xref: /openbmc/u-boot/include/watchdog.h (revision e8f80a5a)
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 /*
15  * Reset the watchdog timer, always returns 0
16  *
17  * This function is here since it is shared between board_f() and board_r(),
18  * and the legacy arch/<arch>/board.c code.
19  */
20 int init_func_watchdog_reset(void);
21 #endif
22 
23 #if defined(CONFIG_WATCHDOG) || defined(CONFIG_HW_WATCHDOG)
24 #define INIT_FUNC_WATCHDOG_INIT	init_func_watchdog_init,
25 #define INIT_FUNC_WATCHDOG_RESET	init_func_watchdog_reset,
26 #else
27 #define INIT_FUNC_WATCHDOG_INIT
28 #define INIT_FUNC_WATCHDOG_RESET
29 #endif
30 
31 #if defined(CONFIG_HW_WATCHDOG) && defined(CONFIG_WATCHDOG)
32 #  error "Configuration error: CONFIG_HW_WATCHDOG and CONFIG_WATCHDOG can't be used together."
33 #endif
34 
35 /*
36  * Hardware watchdog
37  */
38 #ifdef CONFIG_HW_WATCHDOG
39 	#if defined(__ASSEMBLY__)
40 		#define WATCHDOG_RESET bl hw_watchdog_reset
41 	#else
42 		extern void hw_watchdog_reset(void);
43 
44 		#define WATCHDOG_RESET hw_watchdog_reset
45 	#endif /* __ASSEMBLY__ */
46 #else
47 	/*
48 	 * Maybe a software watchdog?
49 	 */
50 	#if defined(CONFIG_WATCHDOG)
51 		#if defined(__ASSEMBLY__)
52 			#define WATCHDOG_RESET bl watchdog_reset
53 		#else
54 			extern void watchdog_reset(void);
55 
56 			#define WATCHDOG_RESET watchdog_reset
57 		#endif
58 	#else
59 		/*
60 		 * No hardware or software watchdog.
61 		 */
62 		#if defined(__ASSEMBLY__)
63 			#define WATCHDOG_RESET /*XXX DO_NOT_DEL_THIS_COMMENT*/
64 		#else
65 			#define WATCHDOG_RESET() {}
66 		#endif /* __ASSEMBLY__ */
67 	#endif /* CONFIG_WATCHDOG && !__ASSEMBLY__ */
68 #endif /* CONFIG_HW_WATCHDOG */
69 
70 /*
71  * Prototypes from $(CPU)/cpu.c.
72  */
73 
74 #if defined(CONFIG_HW_WATCHDOG) && !defined(__ASSEMBLY__)
75 	void hw_watchdog_init(void);
76 #endif
77 
78 #if defined(CONFIG_MPC85xx) && !defined(__ASSEMBLY__)
79 	void init_85xx_watchdog(void);
80 #endif
81 #endif /* _WATCHDOG_H_ */
82