1 /*
2  *
3  * BRIEF MODULE DESCRIPTION
4  *      Board specific pci fixups for the Toshiba rbtx4927
5  *
6  * Copyright 2001 MontaVista Software Inc.
7  * Author: MontaVista Software, Inc.
8  *              ppopov@mvista.com or source@mvista.com
9  *
10  * Copyright (C) 2000-2001 Toshiba Corporation
11  *
12  * Copyright (C) 2004 MontaVista Software Inc.
13  * Author: Manish Lachwani (mlachwani@mvista.com)
14  *
15  *  This program is free software; you can redistribute  it and/or modify it
16  *  under  the terms of  the GNU General  Public License as published by the
17  *  Free Software Foundation;  either version 2 of the  License, or (at your
18  *  option) any later version.
19  *
20  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
21  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
22  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
23  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
24  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
26  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
27  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
28  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  *
31  *  You should have received a copy of the  GNU General Public License along
32  *  with this program; if not, write  to the Free Software Foundation, Inc.,
33  *  675 Mass Ave, Cambridge, MA 02139, USA.
34  */
35 #include <linux/types.h>
36 #include <asm/txx9/pci.h>
37 #include <asm/txx9/rbtx4927.h>
38 
rbtx4927_pci_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)39 int rbtx4927_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
40 {
41 	unsigned char irq = pin;
42 
43 	/* IRQ rotation */
44 	irq--;			/* 0-3 */
45 	if (slot == TX4927_PCIC_IDSEL_AD_TO_SLOT(23)) {
46 		/* PCI CardSlot (IDSEL=A23) */
47 		/* PCIA => PCIA */
48 		irq = (irq + 0 + slot) % 4;
49 	} else {
50 		/* PCI Backplane */
51 		if (txx9_pci_option & TXX9_PCI_OPT_PICMG)
52 			irq = (irq + 33 - slot) % 4;
53 		else
54 			irq = (irq + 3 + slot) % 4;
55 	}
56 	irq++;	/* 1-4 */
57 
58 	switch (irq) {
59 	case 1:
60 		irq = RBTX4927_IRQ_IOC_PCIA;
61 		break;
62 	case 2:
63 		irq = RBTX4927_IRQ_IOC_PCIB;
64 		break;
65 	case 3:
66 		irq = RBTX4927_IRQ_IOC_PCIC;
67 		break;
68 	case 4:
69 		irq = RBTX4927_IRQ_IOC_PCID;
70 		break;
71 	}
72 	return irq;
73 }
74