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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/arch/arm/mach-footbridge/cats-pci.c | |
4 | * | |
5 | * PCI bios-type initialisation for PCI machines | |
6 | * | |
7 | * Bits taken from various places. | |
8 | */ | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/pci.h> | |
11 | #include <linux/init.h> | |
12 | ||
13 | #include <asm/irq.h> | |
14 | #include <asm/mach/pci.h> | |
15 | #include <asm/mach-types.h> | |
16 | ||
17 | /* cats host-specific stuff */ | |
18 | static int irqmap_cats[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 }; | |
19 | ||
66e9279a RK |
20 | static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin) |
21 | { | |
22 | return 0; | |
23 | } | |
24 | ||
d5341942 | 25 | static int __init cats_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
1da177e4 | 26 | { |
e38d523f BD |
27 | if (dev->irq >= 255) |
28 | return -1; /* not a valid interrupt. */ | |
29 | ||
1da177e4 LT |
30 | if (dev->irq >= 128) |
31 | return dev->irq & 0x1f; | |
32 | ||
33 | if (dev->irq >= 1 && dev->irq <= 4) | |
34 | return irqmap_cats[dev->irq - 1]; | |
35 | ||
36 | if (dev->irq != 0) | |
37 | printk("PCI: device %02x:%02x has unknown irq line %x\n", | |
38 | dev->bus->number, dev->devfn, dev->irq); | |
39 | ||
40 | return -1; | |
41 | } | |
42 | ||
43 | /* | |
44 | * why not the standard PCI swizzle? does this prevent 4-port tulip | |
45 | * cards being used (ie, pci-pci bridge based cards)? | |
46 | */ | |
47 | static struct hw_pci cats_pci __initdata = { | |
66e9279a | 48 | .swizzle = cats_no_swizzle, |
1da177e4 LT |
49 | .map_irq = cats_map_irq, |
50 | .nr_controllers = 1, | |
c23bfc38 | 51 | .ops = &dc21285_ops, |
1da177e4 | 52 | .setup = dc21285_setup, |
1da177e4 LT |
53 | .preinit = dc21285_preinit, |
54 | .postinit = dc21285_postinit, | |
55 | }; | |
56 | ||
cdea4606 | 57 | static int __init cats_pci_init(void) |
1da177e4 LT |
58 | { |
59 | if (machine_is_cats()) | |
60 | pci_common_init(&cats_pci); | |
61 | return 0; | |
62 | } | |
63 | ||
64 | subsys_initcall(cats_pci_init); |