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 */ 27void 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 */ 35resource_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 */ 46int 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 */ 57int 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 */ 67int 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 73int 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 */ 81struct 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 87