78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_I8259_H
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#define _ASM_X86_I8259_H
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#include <linux/delay.h>
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extern unsigned int cached_irq_mask;
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#define __byte(x, y) (((unsigned char *)&(y))[x])
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#define cached_master_mask (__byte(0, cached_irq_mask))
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#define cached_slave_mask (__byte(1, cached_irq_mask))
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/* i8259A PIC registers */
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#define PIC_MASTER_CMD 0x20
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#define PIC_MASTER_IMR 0x21
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#define PIC_MASTER_ISR PIC_MASTER_CMD
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#define PIC_MASTER_POLL PIC_MASTER_ISR
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#define PIC_MASTER_OCW3 PIC_MASTER_ISR
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#define PIC_SLAVE_CMD 0xa0
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#define PIC_SLAVE_IMR 0xa1
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/* i8259A PIC related value */
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#define PIC_CASCADE_IR 2
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#define MASTER_ICW4_DEFAULT 0x01
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#define SLAVE_ICW4_DEFAULT 0x01
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#define PIC_ICW4_AEOI 2
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extern raw_spinlock_t i8259A_lock;
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/* the PIC may need a careful delay on some platforms, hence specific calls */
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static inline unsigned char inb_pic(unsigned int port)
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{
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unsigned char value = inb(port);
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/*
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* delay for some accesses to PIC on motherboard or in chipset
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* must be at least one microsecond, so be safe here:
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*/
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udelay(2);
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return value;
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}
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static inline void outb_pic(unsigned char value, unsigned int port)
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{
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outb(value, port);
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/*
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* delay for some accesses to PIC on motherboard or in chipset
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* must be at least one microsecond, so be safe here:
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*/
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udelay(2);
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}
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extern struct irq_chip i8259A_chip;
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struct legacy_pic {
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int nr_legacy_irqs;
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struct irq_chip *chip;
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void (*mask)(unsigned int irq);
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void (*unmask)(unsigned int irq);
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void (*mask_all)(void);
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void (*restore_mask)(void);
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void (*init)(int auto_eoi);
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int (*probe)(void);
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int (*irq_pending)(unsigned int irq);
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void (*make_irq)(unsigned int irq);
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};
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extern struct legacy_pic *legacy_pic;
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extern struct legacy_pic null_legacy_pic;
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static inline int nr_legacy_irqs(void)
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{
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return legacy_pic->nr_legacy_irqs;
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}
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#endif /* _ASM_X86_I8259_H */
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