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 #include <asm/pci-bridge.h>
  23
  24 /*
  25  * Called after each bus is probed, but before its children are examined
  26  */
  27 void pcibios_fixup_bus(struct pci_bus *bus)
  28 {
  29         /* nothing to do, expected to be removed in the future */
  30 }
  31
  32 /*
  33  * We don't have to worry about legacy ISA devices, so nothing to do here
  34  */
  35 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
  36                                 resource_size_t size, resource_size_t align)
  37 {
  38         return res->start;
  39 }
  40
  41 /**
  42  * pcibios_enable_device - Enable I/O and memory.
  43  * @dev: PCI device to be enabled
  44  * @mask: bitmask of BARs to enable
  45  */
  46 int pcibios_enable_device(struct pci_dev *dev, int mask)
  47 {
  48         if (pci_has_flag(PCI_PROBE_ONLY))
  49                 return 0;
  50
  51         return pci_enable_resources(dev, mask);
  52 }
  53
  54 /*
  55  * Try to assign the IRQ number from DT when adding a new device
  56  */
  57 int pcibios_add_device(struct pci_dev *dev)
  58 {
  59         dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
  60
  61         return 0;
  62 }
  63
  64 /*
  65  * raw_pci_read/write - Platform-specific PCI config space access.
  66  */
  67 int raw_pci_read(unsigned int domain, unsigned int bus,
  68                   unsigned int devfn, int reg, int len, u32 *val)
  69 {
  70         return -ENXIO;
  71 }
  72
  73 int raw_pci_write(unsigned int domain, unsigned int bus,
  74                 unsigned int devfn, int reg, int len, u32 val)
  75 {
  76         return -ENXIO;
  77 }
  78
  79 #ifdef CONFIG_ACPI
  80 /* Root bridge scanning */
  81 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
  82 {
  83         /* TODO: Should be revisited when implementing PCI on ACPI */
  84         return NULL;
  85 }
  86 #endif