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 | |