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Linux/arch/arm/mach-footbridge/cats-pci.c

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  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);
 65 

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