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1da177e4 LT |
1 | #ifndef __ASM_I8259_H__ |
2 | #define __ASM_I8259_H__ | |
3 | ||
bc0a733f DR |
4 | #include <linux/delay.h> |
5 | ||
1da177e4 LT |
6 | extern unsigned int cached_irq_mask; |
7 | ||
ace4fdbb | 8 | #define __byte(x, y) (((unsigned char *)&(y))[x]) |
1da177e4 LT |
9 | #define cached_master_mask (__byte(0, cached_irq_mask)) |
10 | #define cached_slave_mask (__byte(1, cached_irq_mask)) | |
11 | ||
f20ebee4 TG |
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 | ||
1da177e4 LT |
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 | ||
bc0a733f DR |
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 | } | |
466eed22 | 57 | |
40bd2174 PM |
58 | extern struct irq_chip i8259A_chip; |
59 | ||
1da177e4 | 60 | #endif /* __ASM_I8259_H__ */ |