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 95