arch/x86/include/asm/i8259.h

   1 #ifndef _ASM_X86_I8259_H
   2 #define _ASM_X86_I8259_H
   3
   4 #include <linux/delay.h>
   5
   6 extern unsigned int cached_irq_mask;
   7
   8 #define __byte(x, y)            (((unsigned char *)&(y))[x])
   9 #define cached_master_mask      (__byte(0, cached_irq_mask))
  10 #define cached_slave_mask       (__byte(1, cached_irq_mask))
  11
  12 /* i8259A PIC registers */
  13 #define PIC_MASTER_CMD          0x20
  14 #define PIC_MASTER_IMR          0x21
  15 #define PIC_MASTER_ISR          PIC_MASTER_CMD
  16 #define PIC_MASTER_POLL         PIC_MASTER_ISR
  17 #define PIC_MASTER_OCW3         PIC_MASTER_ISR
  18 #define PIC_SLAVE_CMD           0xa0
  19 #define PIC_SLAVE_IMR           0xa1
  20
  21 /* i8259A PIC related value */
  22 #define PIC_CASCADE_IR          2
  23 #define MASTER_ICW4_DEFAULT     0x01
  24 #define SLAVE_ICW4_DEFAULT      0x01
  25 #define PIC_ICW4_AEOI           2
  26
  27 extern spinlock_t i8259A_lock;
  28
  29 extern void init_8259A(int auto_eoi);
  30 extern void enable_8259A_irq(unsigned int irq);
  31 extern void disable_8259A_irq(unsigned int irq);
  32 extern unsigned int startup_8259A_irq(unsigned int irq);
  33
  34 /* the PIC may need a careful delay on some platforms, hence specific calls */
  35 static inline unsigned char inb_pic(unsigned int port)
  36 {
  37         unsigned char value = inb(port);
  38
  39         /*
  40          * delay for some accesses to PIC on motherboard or in chipset
  41          * must be at least one microsecond, so be safe here:
  42          */
  43         udelay(2);
  44
  45         return value;
  46 }
  47
  48 static inline void outb_pic(unsigned char value, unsigned int port)
  49 {
  50         outb(value, port);
  51         /*
  52          * delay for some accesses to PIC on motherboard or in chipset
  53          * must be at least one microsecond, so be safe here:
  54          */
  55         udelay(2);
  56 }
  57
  58 extern struct irq_chip i8259A_chip;
  59
  60 extern void mask_8259A(void);
  61 extern void unmask_8259A(void);
  62
  63 #endif /* _ASM_X86_I8259_H */