| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * linux/arch/arm/mach-footbridge/cats-pci.c |
| * |
| * PCI bios-type initialisation for PCI machines |
| * |
| * Bits taken from various places. |
| */ |
| #include <linux/kernel.h> |
| #include <linux/pci.h> |
| #include <linux/init.h> |
| |
| #include <asm/irq.h> |
| #include <asm/mach/pci.h> |
| #include <asm/mach-types.h> |
| |
| /* cats host-specific stuff */ |
| static int irqmap_cats[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 }; |
| |
| static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin) |
| { |
| return 0; |
| } |
| |
| static int __init cats_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
| { |
| if (dev->irq >= 255) |
| return -1; /* not a valid interrupt. */ |
| |
| if (dev->irq >= 128) |
| return dev->irq & 0x1f; |
| |
| if (dev->irq >= 1 && dev->irq <= 4) |
| return irqmap_cats[dev->irq - 1]; |
| |
| if (dev->irq != 0) |
| printk("PCI: device %02x:%02x has unknown irq line %x\n", |
| dev->bus->number, dev->devfn, dev->irq); |
| |
| return -1; |
| } |
| |
| /* |
| * why not the standard PCI swizzle? does this prevent 4-port tulip |
| * cards being used (ie, pci-pci bridge based cards)? |
| */ |
| static struct hw_pci cats_pci __initdata = { |
| .swizzle = cats_no_swizzle, |
| .map_irq = cats_map_irq, |
| .nr_controllers = 1, |
| .ops = &dc21285_ops, |
| .setup = dc21285_setup, |
| .preinit = dc21285_preinit, |
| .postinit = dc21285_postinit, |
| }; |
| |
| static int __init cats_pci_init(void) |
| { |
| if (machine_is_cats()) |
| pci_common_init(&cats_pci); |
| return 0; |
| } |
| |
| subsys_initcall(cats_pci_init); |