Commit | Line | Data |
---|---|---|
1965aae3 PA |
1 | #ifndef _ASM_X86_I8259_H |
2 | #define _ASM_X86_I8259_H | |
1da177e4 | 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 | ||
5619c280 | 27 | extern raw_spinlock_t i8259A_lock; |
1da177e4 | 28 | |
bc0a733f DR |
29 | /* the PIC may need a careful delay on some platforms, hence specific calls */ |
30 | static inline unsigned char inb_pic(unsigned int port) | |
31 | { | |
32 | unsigned char value = inb(port); | |
33 | ||
34 | /* | |
35 | * delay for some accesses to PIC on motherboard or in chipset | |
36 | * must be at least one microsecond, so be safe here: | |
37 | */ | |
38 | udelay(2); | |
39 | ||
40 | return value; | |
41 | } | |
42 | ||
43 | static inline void outb_pic(unsigned char value, unsigned int port) | |
44 | { | |
45 | outb(value, port); | |
46 | /* | |
47 | * delay for some accesses to PIC on motherboard or in chipset | |
48 | * must be at least one microsecond, so be safe here: | |
49 | */ | |
50 | udelay(2); | |
51 | } | |
466eed22 | 52 | |
40bd2174 PM |
53 | extern struct irq_chip i8259A_chip; |
54 | ||
ef354866 JP |
55 | struct legacy_pic { |
56 | int nr_legacy_irqs; | |
57 | struct irq_chip *chip; | |
58 | void (*mask_all)(void); | |
59 | void (*restore_mask)(void); | |
60 | void (*init)(int auto_eoi); | |
61 | int (*irq_pending)(unsigned int irq); | |
62 | void (*make_irq)(unsigned int irq); | |
63 | }; | |
64 | ||
65 | extern struct legacy_pic *legacy_pic; | |
66 | extern struct legacy_pic null_legacy_pic; | |
67 | ||
1965aae3 | 68 | #endif /* _ASM_X86_I8259_H */ |