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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 | ||
17 | /* | |
18 | * Shortcuts ... | |
19 | */ | |
20 | #define SCSI PCIMT_IRQ_SCSI | |
21 | #define ETH PCIMT_IRQ_ETHERNET | |
22 | #define INTA PCIMT_IRQ_INTA | |
23 | #define INTB PCIMT_IRQ_INTB | |
24 | #define INTC PCIMT_IRQ_INTC | |
25 | #define INTD PCIMT_IRQ_INTD | |
26 | ||
27 | /* | |
28 | * Device 0: PCI EISA Bridge (directly routed) | |
29 | * Device 1: NCR53c810 SCSI (directly routed) | |
30 | * Device 2: PCnet32 Ethernet (directly routed) | |
31 | * Device 3: VGA (routed to INTB) | |
32 | * Device 4: Unused | |
33 | * Device 5: Slot 2 | |
34 | * Device 6: Slot 3 | |
35 | * Device 7: Slot 4 | |
36 | * | |
37 | * Documentation says the VGA is device 5 and device 3 is unused but that | |
38 | * seem to be a documentation error. At least on my RM200C the Cirrus | |
39 | * Logic CL-GD5434 VGA is device 3. | |
40 | */ | |
41 | static char irq_tab_rm200[8][5] __initdata = { | |
42 | /* INTA INTB INTC INTD */ | |
43 | { 0, 0, 0, 0, 0 }, /* EISA bridge */ | |
44 | { SCSI, SCSI, SCSI, SCSI, SCSI }, /* SCSI */ | |
45 | { ETH, ETH, ETH, ETH, ETH }, /* Ethernet */ | |
46 | { INTB, INTB, INTB, INTB, INTB }, /* VGA */ | |
47 | { 0, 0, 0, 0, 0 }, /* Unused */ | |
48 | { 0, INTB, INTC, INTD, INTA }, /* Slot 2 */ | |
49 | { 0, INTC, INTD, INTA, INTB }, /* Slot 3 */ | |
50 | { 0, INTD, INTA, INTB, INTC }, /* Slot 4 */ | |
51 | }; | |
52 | ||
53 | /* | |
54 | * In Revision D of the RM300 Device 2 has become a normal purpose Slot 1 | |
55 | * | |
56 | * The VGA card is optional for RM300 systems. | |
57 | */ | |
58 | static char irq_tab_rm300d[8][5] __initdata = { | |
59 | /* INTA INTB INTC INTD */ | |
60 | { 0, 0, 0, 0, 0 }, /* EISA bridge */ | |
61 | { SCSI, SCSI, SCSI, SCSI, SCSI }, /* SCSI */ | |
62 | { 0, INTC, INTD, INTA, INTB }, /* Slot 1 */ | |
63 | { INTB, INTB, INTB, INTB, INTB }, /* VGA */ | |
64 | { 0, 0, 0, 0, 0 }, /* Unused */ | |
65 | { 0, INTB, INTC, INTD, INTA }, /* Slot 2 */ | |
66 | { 0, INTC, INTD, INTA, INTB }, /* Slot 3 */ | |
67 | { 0, INTD, INTA, INTB, INTC }, /* Slot 4 */ | |
68 | }; | |
69 | ||
70 | static inline int is_rm300_revd(void) | |
71 | { | |
72 | unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR; | |
73 | ||
74 | return (csmsr & 0xa0) == 0x20; | |
75 | } | |
76 | ||
77 | int __init pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin) | |
78 | { | |
79 | if (is_rm300_revd()) | |
80 | return irq_tab_rm300d[slot][pin]; | |
81 | ||
82 | return irq_tab_rm200[slot][pin]; | |
83 | } | |
84 | ||
85 | /* Do platform specific device initialization at pci_enable_device() time */ | |
86 | int pcibios_plat_dev_init(struct pci_dev *dev) | |
87 | { | |
88 | return 0; | |
89 | } |