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author | Al Viro <viro@zeniv.linux.org.uk> | 2008-08-17 21:05:42 -0400 |
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committer | H. Peter Anvin <hpa@zytor.com> | 2008-10-22 22:55:20 -0700 |
commit | bb8985586b7a906e116db835c64773b7a7d51663 (patch) | |
tree | de93ae58e88cc563d95cc124a73f3930594c6100 /arch/x86/include/asm/i8259.h | |
parent | 8ede0bdb63305d3353efd97e9af6210afb05734e (diff) | |
download | linux-stable-bb8985586b7a906e116db835c64773b7a7d51663.tar.gz linux-stable-bb8985586b7a906e116db835c64773b7a7d51663.tar.bz2 linux-stable-bb8985586b7a906e116db835c64773b7a7d51663.zip |
x86, um: ... and asm-x86 move
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/include/asm/i8259.h')
-rw-r--r-- | arch/x86/include/asm/i8259.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/x86/include/asm/i8259.h b/arch/x86/include/asm/i8259.h new file mode 100644 index 000000000000..23c1b3baaecd --- /dev/null +++ b/arch/x86/include/asm/i8259.h @@ -0,0 +1,63 @@ +#ifndef ASM_X86__I8259_H +#define ASM_X86__I8259_H + +#include <linux/delay.h> + +extern unsigned int cached_irq_mask; + +#define __byte(x, y) (((unsigned char *)&(y))[x]) +#define cached_master_mask (__byte(0, cached_irq_mask)) +#define cached_slave_mask (__byte(1, cached_irq_mask)) + +/* 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 spinlock_t i8259A_lock; + +extern void init_8259A(int auto_eoi); +extern void enable_8259A_irq(unsigned int irq); +extern void disable_8259A_irq(unsigned int irq); +extern unsigned int startup_8259A_irq(unsigned int irq); + +/* the PIC may need a careful delay on some platforms, hence specific calls */ +static inline unsigned char inb_pic(unsigned int port) +{ + unsigned char value = inb(port); + + /* + * delay for some accesses to PIC on motherboard or in chipset + * must be at least one microsecond, so be safe here: + */ + udelay(2); + + return value; +} + +static inline void outb_pic(unsigned char value, unsigned int port) +{ + outb(value, port); + /* + * delay for some accesses to PIC on motherboard or in chipset + * must be at least one microsecond, so be safe here: + */ + udelay(2); +} + +extern struct irq_chip i8259A_chip; + +extern void mask_8259A(void); +extern void unmask_8259A(void); + +#endif /* ASM_X86__I8259_H */ |