1/*
2 *  arch/arm/include/asm/fiq.h
3 *
4 * Support for FIQ on ARM architectures.
5 * Written by Philip Blundell <philb@gnu.org>, 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
21struct 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
36extern int claim_fiq(struct fiq_handler *f);
37extern void release_fiq(struct fiq_handler *f);
38extern void set_fiq_handler(void *start, unsigned int length);
39extern void enable_fiq(int fiq);
40extern void disable_fiq(int fiq);
41
42/* helpers defined in fiqasm.S: */
43extern void __set_fiq_regs(unsigned long const *regs);
44extern void __get_fiq_regs(unsigned long *regs);
45
46static inline void set_fiq_regs(struct pt_regs const *regs)
47{
48	__set_fiq_regs(&regs->ARM_r8);
49}
50
51static inline void get_fiq_regs(struct pt_regs *regs)
52{
53	__get_fiq_regs(&regs->ARM_r8);
54}
55
56#endif
57