1 // SPDX-License-Identifier: GPL-2.0
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[] = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };
19
cats_no_swizzle(struct pci_dev * dev,u8 * pin)20 static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin)
21 {
22 return 0;
23 }
24
cats_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)25 static int cats_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
26 {
27 if (dev->irq >= 255)
28 return -1; /* not a valid interrupt. */
29
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 = {
48 .swizzle = cats_no_swizzle,
49 .map_irq = cats_map_irq,
50 .nr_controllers = 1,
51 .ops = &dc21285_ops,
52 .setup = dc21285_setup,
53 .preinit = dc21285_preinit,
54 .postinit = dc21285_postinit,
55 };
56
cats_pci_init(void)57 static int __init cats_pci_init(void)
58 {
59 if (machine_is_cats())
60 pci_common_init(&cats_pci);
61 return 0;
62 }
63
64 subsys_initcall(cats_pci_init);
65