Skip to main content

Browse the archive

Revision 54866f032307063776b4eff7eadb131d47f9f9b4 authored by Linus Torvalds on 01 November 2007, 19:09:33 UTC, committed by Linus Torvalds on 01 November 2007, 19:09:33 UTC 
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
 
* 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6:
  [IRDA] IRNET: Fix build when TCGETS2 is defined.
  [NET]: docbook fixes for netif_ functions
  [NET]: Hide the net_ns kmem cache
  [NET]: Mark the setup_net as __net_init
  [NET]: Hide the dead code in the net_namespace.c
  [NET]: Relax the reference counting of init_net_ns
  [NETNS]: Make the init/exit hooks checks outside the loop
  [NET]: Forget the zero_it argument of sk_alloc()
  [NET]: Remove bogus zero_it argument from sk_alloc
  [NET]: Make the sk_clone() lighter
  [NET]: Move some core sock setup into sk_prot_alloc
  [NET]: Auto-zero the allocated sock object
  [NET]: Cleanup the allocation/freeing of the sock object
  [NET]: Move the get_net() from sock_copy()
  [NET]: Move the sock_copy() from the header
  [TCP]: Another TAGBITS -> SACKED_ACKED|LOST conversion
  [TCP]: Process DSACKs that reside within a SACK block
2 parent s b4d367f + 49259d3
Raw File
i8259.h 
/*
 *	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 */
back to top