| /* |
| * Machine specific IO port address definition for generic. |
| * Written by Osamu Tomita <tomita@cinet.co.jp> |
| */ |
| #ifndef __ASM_I8253_H |
| #define __ASM_I8253_H |
| |
| /* i8253A PIT registers */ |
| #define PIT_MODE 0x43 |
| #define PIT_CH0 0x40 |
| #define PIT_CH2 0x42 |
| |
| /* i8259A PIC registers */ |
| #define PIC_MASTER_CMD 0x20 |
| #define PIC_MASTER_IMR 0x21 |
| #define PIC_MASTER_ISR PIC_MASTER_CMD |
| #define PIC_MASTER_POLL PIC_MASTER_ISR |
| #define PIC_MASTER_OCW3 PIC_MASTER_ISR |
| #define PIC_SLAVE_CMD 0xa0 |
| #define PIC_SLAVE_IMR 0xa1 |
| |
| /* i8259A PIC related value */ |
| #define PIC_CASCADE_IR 2 |
| #define MASTER_ICW4_DEFAULT 0x01 |
| #define SLAVE_ICW4_DEFAULT 0x01 |
| #define PIC_ICW4_AEOI 2 |
| |
| extern void setup_pit_timer(void); |
| |
| #endif /* __ASM_I8253_H */ |
