LXR linux/arch/arm/include/asm/fiq.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *  arch/arm/include/asm/fiq.h
   4 *
   5 * Support for FIQ on ARM architectures.
   6 * Written by Philip Blundell <philb@gnu.org>, 1998
   7 * Re-written by Russell King
   8 *
   9 * NOTE: The FIQ mode registers are not magically preserved across
  10 * suspend/resume.
  11 *
  12 * Drivers which require these registers to be preserved across power
  13 * management operations must implement appropriate suspend/resume handlers to
  14 * save and restore them.
  15 */
  16
  17#ifndef __ASM_FIQ_H
  18#define __ASM_FIQ_H
  19
  20#include <asm/ptrace.h>
  21
  22struct fiq_handler {
  23        struct fiq_handler *next;
  24        /* Name
  25         */
  26        const char *name;
  27        /* Called to ask driver to relinquish/
  28         * reacquire FIQ
  29         * return zero to accept, or -<errno>
  30         */
  31        int (*fiq_op)(void *, int relinquish);
  32        /* data for the relinquish/reacquire functions
  33         */
  34        void *dev_id;
  35};
  36
  37extern int claim_fiq(struct fiq_handler *f);
  38extern void release_fiq(struct fiq_handler *f);
  39extern void set_fiq_handler(void *start, unsigned int length);
  40extern void enable_fiq(int fiq);
  41extern void disable_fiq(int fiq);
  42
  43/* helpers defined in fiqasm.S: */
  44extern void __set_fiq_regs(unsigned long const *regs);
  45extern void __get_fiq_regs(unsigned long *regs);
  46
  47static inline void set_fiq_regs(struct pt_regs const *regs)
  48{
  49        __set_fiq_regs(&regs->ARM_r8);
  50}
  51
  52static inline void get_fiq_regs(struct pt_regs *regs)
  53{
  54        __get_fiq_regs(&regs->ARM_r8);
  55}
  56
  57#endif
  58