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83 lines
1.9 KiB
83 lines
1.9 KiB
/* 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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#include <asm/io.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 bool has_legacy_pic(void) |
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{ |
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return legacy_pic != &null_legacy_pic; |
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} |
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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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