Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __ASM_I8259_H__ |
| 2 | #define __ASM_I8259_H__ |
| 3 | |
David P. Reed | bc0a733 | 2008-02-18 13:58:34 -0500 | [diff] [blame] | 4 | #include <linux/delay.h> |
| 5 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | extern unsigned int cached_irq_mask; |
| 7 | |
Joe Perches | ace4fdb | 2008-03-23 01:02:19 -0700 | [diff] [blame] | 8 | #define __byte(x, y) (((unsigned char *)&(y))[x]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #define cached_master_mask (__byte(0, cached_irq_mask)) |
| 10 | #define cached_slave_mask (__byte(1, cached_irq_mask)) |
| 11 | |
Thomas Gleixner | f20ebee | 2008-01-30 13:30:29 +0100 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David P. Reed | bc0a733 | 2008-02-18 13:58:34 -0500 | [diff] [blame] | 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 | } |
Alan Cox | 466eed2 | 2008-01-30 13:33:14 +0100 | [diff] [blame] | 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #endif /* __ASM_I8259_H__ */ |