1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * SNI specific PCI support for RM200/RM300.
7 *
8 * Copyright (C) 1997 - 2000, 2003, 04 Ralf Baechle (ralf@linux-mips.org)
9 */
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/pci.h>
13
14#include <asm/mipsregs.h>
15#include <asm/sni.h>
16
17#include <irq.h>
18
19/*
20 * PCIMT Shortcuts ...
21 */
22#define SCSI	PCIMT_IRQ_SCSI
23#define ETH	PCIMT_IRQ_ETHERNET
24#define INTA	PCIMT_IRQ_INTA
25#define INTB	PCIMT_IRQ_INTB
26#define INTC	PCIMT_IRQ_INTC
27#define INTD	PCIMT_IRQ_INTD
28
29/*
30 * Device 0: PCI EISA Bridge	(directly routed)
31 * Device 1: NCR53c810 SCSI	(directly routed)
32 * Device 2: PCnet32 Ethernet	(directly routed)
33 * Device 3: VGA		(routed to INTB)
34 * Device 4: Unused
35 * Device 5: Slot 2
36 * Device 6: Slot 3
37 * Device 7: Slot 4
38 *
39 * Documentation says the VGA is device 5 and device 3 is unused but that
40 * seem to be a documentation error.  At least on my RM200C the Cirrus
41 * Logic CL-GD5434 VGA is device 3.
42 */
43static char irq_tab_rm200[8][5] __initdata = {
44	/*	 INTA  INTB  INTC  INTD */
45	{     0,    0,	  0,	0,    0 },	/* EISA bridge */
46	{  SCSI, SCSI, SCSI, SCSI, SCSI },	/* SCSI */
47	{   ETH,  ETH,	ETH,  ETH,  ETH },	/* Ethernet */
48	{  INTB, INTB, INTB, INTB, INTB },	/* VGA */
49	{     0,    0,	  0,	0,    0 },	/* Unused */
50	{     0, INTB, INTC, INTD, INTA },	/* Slot 2 */
51	{     0, INTC, INTD, INTA, INTB },	/* Slot 3 */
52	{     0, INTD, INTA, INTB, INTC },	/* Slot 4 */
53};
54
55/*
56 * In Revision D of the RM300 Device 2 has become a normal purpose Slot 1
57 *
58 * The VGA card is optional for RM300 systems.
59 */
60static char irq_tab_rm300d[8][5] __initdata = {
61	/*	 INTA  INTB  INTC  INTD */
62	{     0,    0,	  0,	0,    0 },	/* EISA bridge */
63	{  SCSI, SCSI, SCSI, SCSI, SCSI },	/* SCSI */
64	{     0, INTC, INTD, INTA, INTB },	/* Slot 1 */
65	{  INTB, INTB, INTB, INTB, INTB },	/* VGA */
66	{     0,    0,	  0,	0,    0 },	/* Unused */
67	{     0, INTB, INTC, INTD, INTA },	/* Slot 2 */
68	{     0, INTC, INTD, INTA, INTB },	/* Slot 3 */
69	{     0, INTD, INTA, INTB, INTC },	/* Slot 4 */
70};
71
72static char irq_tab_rm300e[5][5] __initdata = {
73	/*	 INTA  INTB  INTC  INTD */
74	{     0,    0,	  0,	0,    0 },	/* HOST bridge */
75	{  SCSI, SCSI, SCSI, SCSI, SCSI },	/* SCSI */
76	{     0, INTC, INTD, INTA, INTB },	/* Bridge/i960 */
77	{     0, INTD, INTA, INTB, INTC },	/* Slot 1 */
78	{     0, INTA, INTB, INTC, INTD },	/* Slot 2 */
79};
80#undef SCSI
81#undef ETH
82#undef INTA
83#undef INTB
84#undef INTC
85#undef INTD
86
87
88/*
89 * PCIT Shortcuts ...
90 */
91#define SCSI0	PCIT_IRQ_SCSI0
92#define SCSI1	PCIT_IRQ_SCSI1
93#define ETH	PCIT_IRQ_ETHERNET
94#define INTA	PCIT_IRQ_INTA
95#define INTB	PCIT_IRQ_INTB
96#define INTC	PCIT_IRQ_INTC
97#define INTD	PCIT_IRQ_INTD
98
99static char irq_tab_pcit[13][5] __initdata = {
100	/*	 INTA  INTB  INTC  INTD */
101	{     0,     0,	    0,	   0,	  0 },	/* HOST bridge */
102	{ SCSI0, SCSI0, SCSI0, SCSI0, SCSI0 },	/* SCSI */
103	{ SCSI1, SCSI1, SCSI1, SCSI1, SCSI1 },	/* SCSI */
104	{   ETH,   ETH,	  ETH,	 ETH,	ETH },	/* Ethernet */
105	{     0,  INTA,	 INTB,	INTC,  INTD },	/* PCI-PCI bridge */
106	{     0,     0,	    0,	   0,	  0 },	/* Unused */
107	{     0,     0,	    0,	   0,	  0 },	/* Unused */
108	{     0,     0,	    0,	   0,	  0 },	/* Unused */
109	{     0,  INTA,	 INTB,	INTC,  INTD },	/* Slot 1 */
110	{     0,  INTB,	 INTC,	INTD,  INTA },	/* Slot 2 */
111	{     0,  INTC,	 INTD,	INTA,  INTB },	/* Slot 3 */
112	{     0,  INTD,	 INTA,	INTB,  INTC },	/* Slot 4 */
113	{     0,  INTA,	 INTB,	INTC,  INTD },	/* Slot 5 */
114};
115
116static char irq_tab_pcit_cplus[13][5] __initdata = {
117	/*	 INTA  INTB  INTC  INTD */
118	{     0,     0,	    0,	   0,	  0 },	/* HOST bridge */
119	{     0,  INTB,	 INTC,	INTD,  INTA },	/* PCI Slot 9 */
120	{     0,     0,	    0,	   0,	  0 },	/* PCI-EISA */
121	{     0,     0,	    0,	   0,	  0 },	/* Unused */
122	{     0,  INTA,	 INTB,	INTC,  INTD },	/* PCI-PCI bridge */
123	{     0,  INTB,	 INTC,	INTD,  INTA },	/* fixup */
124};
125
126static inline int is_rm300_revd(void)
127{
128	unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
129
130	return (csmsr & 0xa0) == 0x20;
131}
132
133int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
134{
135	switch (sni_brd_type) {
136	case SNI_BRD_PCI_TOWER_CPLUS:
137		if (slot == 4) {
138			/*
139			 * SNI messed up interrupt wiring for onboard
140			 * PCI bus 1; we need to fix this up here
141			 */
142			while (dev && dev->bus->number != 1)
143				dev = dev->bus->self;
144			if (dev && dev->devfn >= PCI_DEVFN(4, 0))
145				slot = 5;
146		}
147		return irq_tab_pcit_cplus[slot][pin];
148	case SNI_BRD_PCI_TOWER:
149		return irq_tab_pcit[slot][pin];
150
151	case SNI_BRD_PCI_MTOWER:
152		if (is_rm300_revd())
153			return irq_tab_rm300d[slot][pin];
154		/* fall through */
155
156	case SNI_BRD_PCI_DESKTOP:
157		return irq_tab_rm200[slot][pin];
158
159	case SNI_BRD_PCI_MTOWER_CPLUS:
160		return irq_tab_rm300e[slot][pin];
161	}
162
163	return 0;
164}
165
166/* Do platform specific device initialization at pci_enable_device() time */
167int pcibios_plat_dev_init(struct pci_dev *dev)
168{
169	return 0;
170}
171