1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * linux/arch/arm/mach-footbridge/cats-pci.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * PCI bios-type initialisation for PCI machines
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Bits taken from various places.
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/pci.h>
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <asm/irq.h>
14*4882a593Smuzhiyun #include <asm/mach/pci.h>
15*4882a593Smuzhiyun #include <asm/mach-types.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun /* cats host-specific stuff */
18*4882a593Smuzhiyun static int irqmap_cats[] = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };
19*4882a593Smuzhiyun
cats_no_swizzle(struct pci_dev * dev,u8 * pin)20*4882a593Smuzhiyun static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun return 0;
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
cats_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)25*4882a593Smuzhiyun static int cats_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun if (dev->irq >= 255)
28*4882a593Smuzhiyun return -1; /* not a valid interrupt. */
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun if (dev->irq >= 128)
31*4882a593Smuzhiyun return dev->irq & 0x1f;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun if (dev->irq >= 1 && dev->irq <= 4)
34*4882a593Smuzhiyun return irqmap_cats[dev->irq - 1];
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun if (dev->irq != 0)
37*4882a593Smuzhiyun printk("PCI: device %02x:%02x has unknown irq line %x\n",
38*4882a593Smuzhiyun dev->bus->number, dev->devfn, dev->irq);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun return -1;
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun /*
44*4882a593Smuzhiyun * why not the standard PCI swizzle? does this prevent 4-port tulip
45*4882a593Smuzhiyun * cards being used (ie, pci-pci bridge based cards)?
46*4882a593Smuzhiyun */
47*4882a593Smuzhiyun static struct hw_pci cats_pci __initdata = {
48*4882a593Smuzhiyun .swizzle = cats_no_swizzle,
49*4882a593Smuzhiyun .map_irq = cats_map_irq,
50*4882a593Smuzhiyun .nr_controllers = 1,
51*4882a593Smuzhiyun .ops = &dc21285_ops,
52*4882a593Smuzhiyun .setup = dc21285_setup,
53*4882a593Smuzhiyun .preinit = dc21285_preinit,
54*4882a593Smuzhiyun .postinit = dc21285_postinit,
55*4882a593Smuzhiyun };
56*4882a593Smuzhiyun
cats_pci_init(void)57*4882a593Smuzhiyun static int __init cats_pci_init(void)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun if (machine_is_cats())
60*4882a593Smuzhiyun pci_common_init(&cats_pci);
61*4882a593Smuzhiyun return 0;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun subsys_initcall(cats_pci_init);
65