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Diffstat (limited to 'kernel/arch/arm/include/asm/fiq.h')
| -rw-r--r-- | kernel/arch/arm/include/asm/fiq.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/kernel/arch/arm/include/asm/fiq.h b/kernel/arch/arm/include/asm/fiq.h new file mode 100644 index 000000000..d493d0b74 --- /dev/null +++ b/kernel/arch/arm/include/asm/fiq.h @@ -0,0 +1,56 @@ +/* + * arch/arm/include/asm/fiq.h + * + * Support for FIQ on ARM architectures. + * Written by Philip Blundell <philb@gnu.org>, 1998 + * Re-written by Russell King + * + * NOTE: The FIQ mode registers are not magically preserved across + * suspend/resume. + * + * Drivers which require these registers to be preserved across power + * management operations must implement appropriate suspend/resume handlers to + * save and restore them. + */ + +#ifndef __ASM_FIQ_H +#define __ASM_FIQ_H + +#include <asm/ptrace.h> + +struct fiq_handler { + struct fiq_handler *next; + /* Name + */ + const char *name; + /* Called to ask driver to relinquish/ + * reacquire FIQ + * return zero to accept, or -<errno> + */ + int (*fiq_op)(void *, int relinquish); + /* data for the relinquish/reacquire functions + */ + void *dev_id; +}; + +extern int claim_fiq(struct fiq_handler *f); +extern void release_fiq(struct fiq_handler *f); +extern void set_fiq_handler(void *start, unsigned int length); +extern void enable_fiq(int fiq); +extern void disable_fiq(int fiq); + +/* helpers defined in fiqasm.S: */ +extern void __set_fiq_regs(unsigned long const *regs); +extern void __get_fiq_regs(unsigned long *regs); + +static inline void set_fiq_regs(struct pt_regs const *regs) +{ + __set_fiq_regs(®s->ARM_r8); +} + +static inline void get_fiq_regs(struct pt_regs *regs) +{ + __get_fiq_regs(®s->ARM_r8); +} + +#endif |