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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/pci/fixup-rbtx4938.c
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/*

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 * Toshiba rbtx4938 pci routines

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 * Copyright (C) 2000-2001 Toshiba Corporation

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 *

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 * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the

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 * terms of the GNU General Public License version 2. This program is

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 * licensed "as is" without any warranty of any kind, whether express

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 * or implied.

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 *

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 * Support for TX4938 in 2.6 - Manish Lachwani ([email protected])

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 */

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#include <linux/types.h>

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#include <asm/txx9/pci.h>

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#include <asm/txx9/rbtx4938.h>

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int __init rbtx4938_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

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{

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	int irq = tx4938_pcic1_map_irq(dev, slot);

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	if (irq >= 0)

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		return irq;

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	irq = pin;

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	/* IRQ rotation */

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	irq--;	/* 0-3 */

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	if (slot == TX4927_PCIC_IDSEL_AD_TO_SLOT(23)) {

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		/* PCI CardSlot (IDSEL=A23) */

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		/* PCIA => PCIA (IDSEL=A23) */

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		irq = (irq + 0 + slot) % 4;

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	} else {

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		/* PCI Backplane */

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		if (txx9_pci_option & TXX9_PCI_OPT_PICMG)

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			irq = (irq + 33 - slot) % 4;

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		else

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			irq = (irq + 3 + slot) % 4;

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	}

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	irq++;	/* 1-4 */

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	switch (irq) {

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	case 1:

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		irq = RBTX4938_IRQ_IOC_PCIA;

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		break;

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	case 2:

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		irq = RBTX4938_IRQ_IOC_PCIB;

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		break;

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	case 3:

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		irq = RBTX4938_IRQ_IOC_PCIC;

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		break;

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	case 4:

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		irq = RBTX4938_IRQ_IOC_PCID;

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		break;

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	}

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	return irq;

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}

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