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1da177e4 LT |
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 | ||
3a1d8217 RB |
17 | #include <irq.h> |
18 | ||
1da177e4 | 19 | /* |
c066a32a | 20 | * PCIMT Shortcuts ... |
1da177e4 LT |
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 | |
42a3b4f2 | 37 | * Device 7: Slot 4 |
1da177e4 LT |
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] __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 | */ | |
60 | static 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 | ||
c066a32a TB |
72 | static 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 | ||
99 | static 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 | ||
1da177e4 LT |
116 | static inline int is_rm300_revd(void) |
117 | { | |
118 | unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR; | |
119 | ||
120 | return (csmsr & 0xa0) == 0x20; | |
121 | } | |
122 | ||
123 | int __init pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin) | |
124 | { | |
c066a32a TB |
125 | switch (sni_brd_type) { |
126 | case SNI_BRD_PCI_TOWER: | |
127 | case SNI_BRD_PCI_TOWER_CPLUS: | |
128 | return irq_tab_pcit[slot][pin]; | |
129 | ||
130 | case SNI_BRD_PCI_MTOWER: | |
131 | if (is_rm300_revd()) | |
132 | return irq_tab_rm300d[slot][pin]; | |
133 | /* fall through */ | |
1da177e4 | 134 | |
c066a32a TB |
135 | case SNI_BRD_PCI_DESKTOP: |
136 | return irq_tab_rm200[slot][pin]; | |
137 | ||
138 | case SNI_BRD_PCI_MTOWER_CPLUS: | |
139 | return irq_tab_rm300e[slot][pin]; | |
140 | } | |
141 | ||
142 | return 0; | |
1da177e4 LT |
143 | } |
144 | ||
145 | /* Do platform specific device initialization at pci_enable_device() time */ | |
146 | int pcibios_plat_dev_init(struct pci_dev *dev) | |
147 | { | |
148 | return 0; | |
149 | } |