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Diffstat (limited to 'include/asm-mips/i8259.h')
| -rw-r--r-- | include/asm-mips/i8259.h | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/include/asm-mips/i8259.h b/include/asm-mips/i8259.h deleted file mode 100644 index 8572a2d90484..000000000000 --- a/include/asm-mips/i8259.h +++ /dev/null @@ -1,86 +0,0 @@ -/* - * include/asm-mips/i8259.h - * - * i8259A interrupt definitions. - * - * Copyright (C) 2003 Maciej W. Rozycki - * Copyright (C) 2003 Ralf Baechle <ralf@linux-mips.org> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ -#ifndef _ASM_I8259_H -#define _ASM_I8259_H - -#include <linux/compiler.h> -#include <linux/spinlock.h> - -#include <asm/io.h> -#include <irq.h> - -/* 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 int i8259A_irq_pending(unsigned int irq); -extern void make_8259A_irq(unsigned int irq); - -extern void init_i8259_irqs(void); - -/* - * Do the traditional i8259 interrupt polling thing. This is for the few - * cases where no better interrupt acknowledge method is available and we - * absolutely must touch the i8259. - */ -static inline int i8259_irq(void) -{ - int irq; - - spin_lock(&i8259A_lock); - - /* Perform an interrupt acknowledge cycle on controller 1. */ - outb(0x0C, PIC_MASTER_CMD); /* prepare for poll */ - irq = inb(PIC_MASTER_CMD) & 7; - if (irq == PIC_CASCADE_IR) { - /* - * Interrupt is cascaded so perform interrupt - * acknowledge on controller 2. - */ - outb(0x0C, PIC_SLAVE_CMD); /* prepare for poll */ - irq = (inb(PIC_SLAVE_CMD) & 7) + 8; - } - - if (unlikely(irq == 7)) { - /* - * This may be a spurious interrupt. - * - * Read the interrupt status register (ISR). If the most - * significant bit is not set then there is no valid - * interrupt. - */ - outb(0x0B, PIC_MASTER_ISR); /* ISR register */ - if(~inb(PIC_MASTER_ISR) & 0x80) - irq = -1; - } - - spin_unlock(&i8259A_lock); - - return likely(irq >= 0) ? irq + I8259A_IRQ_BASE : irq; -} - -#endif /* _ASM_I8259_H */ |