1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*
* linux/arch/arm/mach-integrator/pci-integrator.c
*
* Copyright (C) 1999 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* PCI functions for Integrator
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ptrace.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/mach/pci.h>
#include <asm/mach-types.h>
/*
* A small note about bridges and interrupts. The DECchip 21050 (and
* later) adheres to the PCI-PCI bridge specification. This says that
* the interrupts on the other side of a bridge are swizzled in the
* following manner:
*
* Dev Interrupt Interrupt
* Pin on Pin on
* Device Connector
*
* 4 A A
* B B
* C C
* D D
*
* 5 A B
* B C
* C D
* D A
*
* 6 A C
* B D
* C A
* D B
*
* 7 A D
* B A
* C B
* D C
*
* Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
* Thus, each swizzle is ((pin-1) + (device#-4)) % 4
*
* The following code swizzles for exactly one bridge.
*/
static inline int bridge_swizzle(int pin, unsigned int slot)
{
return (pin + slot) & 3;
}
/*
* This routine handles multiple bridges.
*/
static u8 __init integrator_swizzle(struct pci_dev *dev, u8 *pinp)
{
int pin = *pinp;
if (pin == 0)
pin = 1;
pin -= 1;
while (dev->bus->self) {
pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
/*
* move up the chain of bridges, swizzling as we go.
*/
dev = dev->bus->self;
}
*pinp = pin + 1;
return PCI_SLOT(dev->devfn);
}
static int irq_tab[4] __initdata = {
IRQ_AP_PCIINT0, IRQ_AP_PCIINT1, IRQ_AP_PCIINT2, IRQ_AP_PCIINT3
};
/*
* map the specified device/slot/pin to an IRQ. This works out such
* that slot 9 pin 1 is INT0, pin 2 is INT1, and slot 10 pin 1 is INT1.
*/
static int __init integrator_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
int intnr = ((slot - 9) + (pin - 1)) & 3;
return irq_tab[intnr];
}
extern void pci_v3_init(void *);
static struct hw_pci integrator_pci __initdata = {
.swizzle = integrator_swizzle,
.map_irq = integrator_map_irq,
.setup = pci_v3_setup,
.nr_controllers = 1,
.scan = pci_v3_scan_bus,
.preinit = pci_v3_preinit,
.postinit = pci_v3_postinit,
};
static int __init integrator_pci_init(void)
{
if (machine_is_integrator())
pci_common_init(&integrator_pci);
return 0;
}
subsys_initcall(integrator_pci_init);
|
