1/*
2 * Toshiba rbtx4938 pci routines
3 * Copyright (C) 2000-2001 Toshiba Corporation
4 *
5 * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
6 * terms of the GNU General Public License version 2. This program is
7 * licensed "as is" without any warranty of any kind, whether express
8 * or implied.
9 *
10 * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
11 */
12#include <linux/types.h>
13#include <asm/txx9/pci.h>
14#include <asm/txx9/rbtx4938.h>
15
16int __init rbtx4938_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
17{
18	int irq = tx4938_pcic1_map_irq(dev, slot);
19
20	if (irq >= 0)
21		return irq;
22	irq = pin;
23	/* IRQ rotation */
24	irq--;	/* 0-3 */
25	if (slot == TX4927_PCIC_IDSEL_AD_TO_SLOT(23)) {
26		/* PCI CardSlot (IDSEL=A23) */
27		/* PCIA => PCIA (IDSEL=A23) */
28		irq = (irq + 0 + slot) % 4;
29	} else {
30		/* PCI Backplane */
31		if (txx9_pci_option & TXX9_PCI_OPT_PICMG)
32			irq = (irq + 33 - slot) % 4;
33		else
34			irq = (irq + 3 + slot) % 4;
35	}
36	irq++;	/* 1-4 */
37
38	switch (irq) {
39	case 1:
40		irq = RBTX4938_IRQ_IOC_PCIA;
41		break;
42	case 2:
43		irq = RBTX4938_IRQ_IOC_PCIB;
44		break;
45	case 3:
46		irq = RBTX4938_IRQ_IOC_PCIC;
47		break;
48	case 4:
49		irq = RBTX4938_IRQ_IOC_PCID;
50		break;
51	}
52	return irq;
53}
54