| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 }; |
| 19 | |
| 20 | static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin) |
| 21 | { |
| 22 | return 0; |
| 23 | } |
| 24 | |
| 25 | static int __init 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 | |
| 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); |