arch/arm/include/asm/fiq.h

   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
  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