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(®s->ARM_r8); 49 } 50 51 static inline void get_fiq_regs(struct pt_regs *regs) 52 { 53 __get_fiq_regs(®s->ARM_r8); 54 } 55 56 #endif 57