arch/arm64/kernel/pci.c

   1 /*
   2  * Code borrowed from powerpc/kernel/pci-common.c
   3  *
   4  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
   5  * Copyright (C) 2014 ARM Ltd.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  */
  12
  13 #include <linux/acpi.h>
  14 #include <linux/init.h>
  15 #include <linux/io.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/of_pci.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/slab.h>
  21
  22 /*
  23  * Called after each bus is probed, but before its children are examined
  24  */
  25 void pcibios_fixup_bus(struct pci_bus *bus)
  26 {
  27         /* nothing to do, expected to be removed in the future */
  28 }
  29
  30 /*
  31  * We don't have to worry about legacy ISA devices, so nothing to do here
  32  */
  33 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
  34                                 resource_size_t size, resource_size_t align)
  35 {
  36         return res->start;
  37 }
  38
  39 /**
  40  * pcibios_enable_device - Enable I/O and memory.
  41  * @dev: PCI device to be enabled
  42  * @mask: bitmask of BARs to enable
  43  */
  44 int pcibios_enable_device(struct pci_dev *dev, int mask)
  45 {
  46         if (pci_has_flag(PCI_PROBE_ONLY))
  47                 return 0;
  48
  49         return pci_enable_resources(dev, mask);
  50 }
  51
  52 /*
  53  * Try to assign the IRQ number from DT when adding a new device
  54  */
  55 int pcibios_add_device(struct pci_dev *dev)
  56 {
  57         dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
  58
  59         return 0;
  60 }
  61
  62 /*
  63  * raw_pci_read/write - Platform-specific PCI config space access.
  64  */
  65 int raw_pci_read(unsigned int domain, unsigned int bus,
  66                   unsigned int devfn, int reg, int len, u32 *val)
  67 {
  68         return -ENXIO;
  69 }
  70
  71 int raw_pci_write(unsigned int domain, unsigned int bus,
  72                 unsigned int devfn, int reg, int len, u32 val)
  73 {
  74         return -ENXIO;
  75 }
  76
  77 #ifdef CONFIG_NUMA
  78
  79 int pcibus_to_node(struct pci_bus *bus)
  80 {
  81         return dev_to_node(&bus->dev);
  82 }
  83 EXPORT_SYMBOL(pcibus_to_node);
  84
  85 #endif
  86
  87 #ifdef CONFIG_ACPI
  88 /* Root bridge scanning */
  89 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
  90 {
  91         /* TODO: Should be revisited when implementing PCI on ACPI */
  92         return NULL;
  93 }
  94 #endif