54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/*
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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 (mlachwani@mvista.com)
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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 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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