Linux Kernel  3.7.1
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fiq.h
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1 /*
2  * arch/arm/include/asm/fiq.h
3  *
4  * Support for FIQ on ARM architectures.
5  * Written by Philip Blundell <[email protected]>, 1998
6  * Re-written by Russell King
7  *
8  * NOTE: The FIQ mode registers are not magically preserved across
9  * suspend/resume.
10  *
11  * Drivers which require these registers to be preserved across power
12  * management operations must implement appropriate suspend/resume handlers to
13  * save and restore them.
14  */
15 
16 #ifndef __ASM_FIQ_H
17 #define __ASM_FIQ_H
18 
19 #include <asm/ptrace.h>
20 
21 struct fiq_handler {
22  struct fiq_handler *next;
23  /* Name
24  */
25  const char *name;
26  /* Called to ask driver to relinquish/
27  * reacquire FIQ
28  * return zero to accept, or -<errno>
29  */
30  int (*fiq_op)(void *, int relinquish);
31  /* data for the relinquish/reacquire functions
32  */
33  void *dev_id;
34 };
35 
36 extern int claim_fiq(struct fiq_handler *f);
37 extern void release_fiq(struct fiq_handler *f);
38 extern void set_fiq_handler(void *start, unsigned int length);
39 extern void enable_fiq(int fiq);
40 extern void disable_fiq(int fiq);
41 
42 /* helpers defined in fiqasm.S: */
43 extern void __set_fiq_regs(unsigned long const *regs);
44 extern void __get_fiq_regs(unsigned long *regs);
45 
46 static inline void set_fiq_regs(struct pt_regs const *regs)
47 {
48  __set_fiq_regs(&regs->ARM_r8);
49 }
50 
51 static inline void get_fiq_regs(struct pt_regs *regs)
52 {
53  __get_fiq_regs(&regs->ARM_r8);
54 }
55 
56 #endif