summaryrefslogtreecommitdiffstats
path: root/include/asm-mips/i8259.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-mips/i8259.h')
-rw-r--r--include/asm-mips/i8259.h86
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 8572a2d..0000000
--- 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 */
OpenPOWER on IntegriCloud