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 <linux/pci.h>
37#include <linux/kernel.h>
38#include <linux/init.h>
39
40#include <asm/tx4927/tx4927.h>
41#include <asm/tx4927/tx4927_pci.h>
42
43#undef  DEBUG
44#ifdef  DEBUG
45#define DBG(x...)       printk(x)
46#else
47#define DBG(x...)
48#endif
49
50/* look up table for backplane pci irq for slots 17-20 by pin # */
51static unsigned char backplane_pci_irq[4][4] = {
52	/* PJ6 SLOT:  17, PIN: 1 */ {TX4927_IRQ_IOC_PCIA,
53				     /* PJ6 SLOT:  17, PIN: 2 */
54				     TX4927_IRQ_IOC_PCIB,
55				     /* PJ6 SLOT:  17, PIN: 3 */
56				     TX4927_IRQ_IOC_PCIC,
57				     /* PJ6 SLOT:  17, PIN: 4 */
58				     TX4927_IRQ_IOC_PCID},
59	/* SB  SLOT:  18, PIN: 1 */ {TX4927_IRQ_IOC_PCIB,
60				     /* SB  SLOT:  18, PIN: 2 */
61				     TX4927_IRQ_IOC_PCIC,
62				     /* SB  SLOT:  18, PIN: 3 */
63				     TX4927_IRQ_IOC_PCID,
64				     /* SB  SLOT:  18, PIN: 4 */
65				     TX4927_IRQ_IOC_PCIA},
66	/* PJ5 SLOT:  19, PIN: 1 */ {TX4927_IRQ_IOC_PCIC,
67				     /* PJ5 SLOT:  19, PIN: 2 */
68				     TX4927_IRQ_IOC_PCID,
69				     /* PJ5 SLOT:  19, PIN: 3 */
70				     TX4927_IRQ_IOC_PCIA,
71				     /* PJ5 SLOT:  19, PIN: 4 */
72				     TX4927_IRQ_IOC_PCIB},
73	/* PJ4 SLOT:  20, PIN: 1 */ {TX4927_IRQ_IOC_PCID,
74				     /* PJ4 SLOT:  20, PIN: 2 */
75				     TX4927_IRQ_IOC_PCIA,
76				     /* PJ4 SLOT:  20, PIN: 3 */
77				     TX4927_IRQ_IOC_PCIB,
78				     /* PJ4 SLOT:  20, PIN: 4 */
79				     TX4927_IRQ_IOC_PCIC}
80};
81
82int pci_get_irq(struct pci_dev *dev, int pin)
83{
84	unsigned char irq = pin;
85
86	DBG("pci_get_irq: pin is %d\n", pin);
87	/* IRQ rotation */
88	irq--;			/* 0-3 */
89	if (dev->bus->parent == NULL &&
90	    PCI_SLOT(dev->devfn) == TX4927_PCIC_IDSEL_AD_TO_SLOT(23)) {
91		printk("Onboard PCI_SLOT(dev->devfn) is %d\n",
92		       PCI_SLOT(dev->devfn));
93		/* IDSEL=A23 is tx4927 onboard pci slot */
94		irq = (irq + PCI_SLOT(dev->devfn)) % 4;
95		irq++;		/* 1-4 */
96		DBG("irq is now %d\n", irq);
97
98		switch (irq) {
99		case 1:
100			irq = TX4927_IRQ_IOC_PCIA;
101			break;
102		case 2:
103			irq = TX4927_IRQ_IOC_PCIB;
104			break;
105		case 3:
106			irq = TX4927_IRQ_IOC_PCIC;
107			break;
108		case 4:
109			irq = TX4927_IRQ_IOC_PCID;
110			break;
111		}
112	} else {
113		/* PCI Backplane */
114		DBG("PCI Backplane PCI_SLOT(dev->devfn) is %d\n",
115		    PCI_SLOT(dev->devfn));
116		irq = backplane_pci_irq[PCI_SLOT(dev->devfn) - 17][irq];
117	}
118	DBG("assigned irq %d\n", irq);
119	return irq;
120}
121
122int __init pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
123{
124	unsigned char irq;
125
126	printk("PCI Setup for pin %d \n", pin);
127
128	if (dev->device == 0x9130) /* IDE */
129		irq = 14;
130	else
131		irq = pci_get_irq(dev, pin);
132
133	return irq;
134}
135
136/* Do platform specific device initialization at pci_enable_device() time */
137int pcibios_plat_dev_init(struct pci_dev *dev)
138{
139	return 0;
140}
141