arch/arm64/kernel/pci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Code borrowed from powerpc/kernel/pci-common.c
   4  *
   5  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
   6  * Copyright (C) 2014 ARM Ltd.
   7  */
   8
   9 #include <linux/pci.h>
  10
  11 /*
  12  * raw_pci_read/write - Platform-specific PCI config space access.
  13  */
  14 int raw_pci_read(unsigned int domain, unsigned int bus,
  15                   unsigned int devfn, int reg, int len, u32 *val)
  16 {
  17         struct pci_bus *b = pci_find_bus(domain, bus);
  18
  19         if (!b)
  20                 return PCIBIOS_DEVICE_NOT_FOUND;
  21         return b->ops->read(b, devfn, reg, len, val);
  22 }
  23
  24 int raw_pci_write(unsigned int domain, unsigned int bus,
  25                 unsigned int devfn, int reg, int len, u32 val)
  26 {
  27         struct pci_bus *b = pci_find_bus(domain, bus);
  28
  29         if (!b)
  30                 return PCIBIOS_DEVICE_NOT_FOUND;
  31         return b->ops->write(b, devfn, reg, len, val);
  32 }
  33
  34 #ifdef CONFIG_NUMA
  35
  36 int pcibus_to_node(struct pci_bus *bus)
  37 {
  38         return dev_to_node(&bus->dev);
  39 }
  40 EXPORT_SYMBOL(pcibus_to_node);
  41
  42 #endif