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kernel/linux-imx6_3.14.28/arch/mips/pci/fixup-rbtx4927.c 2.32 KB
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  /*
   *
   * BRIEF MODULE DESCRIPTION
   *      Board specific pci fixups for the Toshiba rbtx4927
   *
   * Copyright 2001 MontaVista Software Inc.
   * Author: MontaVista Software, Inc.
   *              ppopov@mvista.com or source@mvista.com
   *
   * Copyright (C) 2000-2001 Toshiba Corporation
   *
   * Copyright (C) 2004 MontaVista Software Inc.
   * Author: Manish Lachwani (mlachwani@mvista.com)
   *
   *  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.
   *
   *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
   *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
   *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
   *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
   *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
   *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
   *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
   *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   *  You should have received a copy of the  GNU General Public License along
   *  with this program; if not, write  to the Free Software Foundation, Inc.,
   *  675 Mass Ave, Cambridge, MA 02139, USA.
   */
  #include <linux/types.h>
  #include <asm/txx9/pci.h>
  #include <asm/txx9/rbtx4927.h>
  
  int __init rbtx4927_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  {
  	unsigned char irq = pin;
  
  	/* IRQ rotation */
  	irq--;			/* 0-3 */
  	if (slot == TX4927_PCIC_IDSEL_AD_TO_SLOT(23)) {
  		/* PCI CardSlot (IDSEL=A23) */
  		/* PCIA => PCIA */
  		irq = (irq + 0 + slot) % 4;
  	} else {
  		/* PCI Backplane */
  		if (txx9_pci_option & TXX9_PCI_OPT_PICMG)
  			irq = (irq + 33 - slot) % 4;
  		else
  			irq = (irq + 3 + slot) % 4;
  	}
  	irq++;	/* 1-4 */
  
  	switch (irq) {
  	case 1:
  		irq = RBTX4927_IRQ_IOC_PCIA;
  		break;
  	case 2:
  		irq = RBTX4927_IRQ_IOC_PCIB;
  		break;
  	case 3:
  		irq = RBTX4927_IRQ_IOC_PCIC;
  		break;
  	case 4:
  		irq = RBTX4927_IRQ_IOC_PCID;
  		break;
  	}
  	return irq;
  }