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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mach-integrator/pci-integrator.c | |
3 | * | |
4 | * Copyright (C) 1999 ARM Limited | |
5 | * Copyright (C) 2000 Deep Blue Solutions Ltd | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * | |
22 | * PCI functions for Integrator | |
23 | */ | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/pci.h> | |
1da177e4 LT |
26 | #include <linux/interrupt.h> |
27 | #include <linux/init.h> | |
28 | ||
29 | #include <asm/irq.h> | |
30 | #include <asm/system.h> | |
31 | #include <asm/mach/pci.h> | |
32 | #include <asm/mach-types.h> | |
33 | ||
34 | /* | |
35 | * A small note about bridges and interrupts. The DECchip 21050 (and | |
36 | * later) adheres to the PCI-PCI bridge specification. This says that | |
37 | * the interrupts on the other side of a bridge are swizzled in the | |
38 | * following manner: | |
39 | * | |
40 | * Dev Interrupt Interrupt | |
41 | * Pin on Pin on | |
42 | * Device Connector | |
43 | * | |
44 | * 4 A A | |
45 | * B B | |
46 | * C C | |
47 | * D D | |
48 | * | |
49 | * 5 A B | |
50 | * B C | |
51 | * C D | |
52 | * D A | |
53 | * | |
54 | * 6 A C | |
55 | * B D | |
56 | * C A | |
57 | * D B | |
58 | * | |
59 | * 7 A D | |
60 | * B A | |
61 | * C B | |
62 | * D C | |
63 | * | |
64 | * Where A = pin 1, B = pin 2 and so on and pin=0 = default = A. | |
65 | * Thus, each swizzle is ((pin-1) + (device#-4)) % 4 | |
1da177e4 | 66 | */ |
1da177e4 LT |
67 | |
68 | /* | |
69 | * This routine handles multiple bridges. | |
70 | */ | |
71 | static u8 __init integrator_swizzle(struct pci_dev *dev, u8 *pinp) | |
72 | { | |
73 | int pin = *pinp; | |
74 | ||
75 | if (pin == 0) | |
76 | pin = 1; | |
77 | ||
1da177e4 | 78 | while (dev->bus->self) { |
f14d766a | 79 | pin = pci_swizzle_interrupt_pin(dev, pin); |
1da177e4 LT |
80 | /* |
81 | * move up the chain of bridges, swizzling as we go. | |
82 | */ | |
83 | dev = dev->bus->self; | |
84 | } | |
f14d766a | 85 | *pinp = pin; |
1da177e4 LT |
86 | |
87 | return PCI_SLOT(dev->devfn); | |
88 | } | |
89 | ||
90 | static int irq_tab[4] __initdata = { | |
91 | IRQ_AP_PCIINT0, IRQ_AP_PCIINT1, IRQ_AP_PCIINT2, IRQ_AP_PCIINT3 | |
92 | }; | |
93 | ||
94 | /* | |
95 | * map the specified device/slot/pin to an IRQ. This works out such | |
96 | * that slot 9 pin 1 is INT0, pin 2 is INT1, and slot 10 pin 1 is INT1. | |
97 | */ | |
d5341942 | 98 | static int __init integrator_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
1da177e4 LT |
99 | { |
100 | int intnr = ((slot - 9) + (pin - 1)) & 3; | |
101 | ||
102 | return irq_tab[intnr]; | |
103 | } | |
104 | ||
105 | extern void pci_v3_init(void *); | |
106 | ||
107 | static struct hw_pci integrator_pci __initdata = { | |
108 | .swizzle = integrator_swizzle, | |
109 | .map_irq = integrator_map_irq, | |
110 | .setup = pci_v3_setup, | |
111 | .nr_controllers = 1, | |
112 | .scan = pci_v3_scan_bus, | |
113 | .preinit = pci_v3_preinit, | |
114 | .postinit = pci_v3_postinit, | |
115 | }; | |
116 | ||
117 | static int __init integrator_pci_init(void) | |
118 | { | |
119 | if (machine_is_integrator()) | |
120 | pci_common_init(&integrator_pci); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | subsys_initcall(integrator_pci_init); |