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 */
43 static char irq_tab_rm200[8][5] = {
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 */
60 static char irq_tab_rm300d[8][5] = {
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
72 static char irq_tab_rm300e[5][5] = {
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
99 static char irq_tab_pcit[13][5] = {
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
116 static char irq_tab_pcit_cplus[13][5] = {
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
126 static inline int is_rm300_revd(void)
127 {
128 unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
129
130 return (csmsr & 0xa0) == 0x20;
131 }
132
133 int 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 fallthrough;
155 case SNI_BRD_PCI_DESKTOP:
156 return irq_tab_rm200[slot][pin];
157
158 case SNI_BRD_PCI_MTOWER_CPLUS:
159 return irq_tab_rm300e[slot][pin];
160 }
161
162 return 0;
163 }
164
165 /* Do platform specific device initialization at pci_enable_device() time */
166 int pcibios_plat_dev_init(struct pci_dev *dev)
167 {
168 return 0;
169 }
170
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