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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/pci/fixup-rbtx4927.c
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/*

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 *

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 * BRIEF MODULE DESCRIPTION

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 *      Board specific pci fixups for the Toshiba rbtx4927

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 *

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 * Copyright 2001 MontaVista Software Inc.

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 * Author: MontaVista Software, Inc.

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 *              [email protected] or [email protected]

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 *

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 * Copyright (C) 2000-2001 Toshiba Corporation

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 *

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 * Copyright (C) 2004 MontaVista Software Inc.

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 * Author: Manish Lachwani ([email protected])

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 *

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 *  This program is free software; you can redistribute  it and/or modify it

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 *  under  the terms of  the GNU General  Public License as published by the

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 *  Free Software Foundation;  either version 2 of the  License, or (at your

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 *  option) any later version.

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 *

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 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED

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 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF

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 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN

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 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,

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 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

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 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF

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 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON

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 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT

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 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

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 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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 *

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 *  You should have received a copy of the  GNU General Public License along

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 *  with this program; if not, write  to the Free Software Foundation, Inc.,

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 *  675 Mass Ave, Cambridge, MA 02139, USA.

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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/rbtx4927.h>

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int __init rbtx4927_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

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{

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	unsigned char 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 */

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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 = RBTX4927_IRQ_IOC_PCIA;

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		break;

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	case 2:

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		irq = RBTX4927_IRQ_IOC_PCIB;

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		break;

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	case 3:

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		irq = RBTX4927_IRQ_IOC_PCIC;

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		break;

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	case 4:

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		irq = RBTX4927_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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