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 */
pcibios_fixup_bus(struct pci_bus * bus)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 */
pcibios_align_resource(void * data,const struct resource * res,resource_size_t size,resource_size_t align)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 */
pcibios_enable_device(struct pci_dev * dev,int mask)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 */
pcibios_add_device(struct pci_dev * dev)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 */
raw_pci_read(unsigned int domain,unsigned int bus,unsigned int devfn,int reg,int len,u32 * val)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
raw_pci_write(unsigned int domain,unsigned int bus,unsigned int devfn,int reg,int len,u32 val)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 */
pci_acpi_scan_root(struct acpi_pci_root * root)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