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 87