1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
4 *			 <benh@kernel.crashing.org>
5 *    and		 Arnd Bergmann, IBM Corp.
6 */
7
8#undef DEBUG
9
10#include <linux/string.h>
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/export.h>
14#include <linux/mod_devicetable.h>
15#include <linux/pci.h>
16#include <linux/platform_device.h>
17#include <linux/atomic.h>
18
19#include <asm/errno.h>
20#include <asm/topology.h>
21#include <asm/pci-bridge.h>
22#include <asm/ppc-pci.h>
23#include <asm/eeh.h>
24
25#ifdef CONFIG_PPC_OF_PLATFORM_PCI
26
27/* The probing of PCI controllers from of_platform is currently
28 * 64 bits only, mostly due to gratuitous differences between
29 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
30 * lacking some bits needed here.
31 */
32
33static int of_pci_phb_probe(struct platform_device *dev)
34{
35	struct pci_controller *phb;
36
37	/* Check if we can do that ... */
38	if (ppc_md.pci_setup_phb == NULL)
39		return -ENODEV;
40
41	pr_info("Setting up PCI bus %pOF\n", dev->dev.of_node);
42
43	/* Alloc and setup PHB data structure */
44	phb = pcibios_alloc_controller(dev->dev.of_node);
45	if (!phb)
46		return -ENODEV;
47
48	/* Setup parent in sysfs */
49	phb->parent = &dev->dev;
50
51	/* Setup the PHB using arch provided callback */
52	if (ppc_md.pci_setup_phb(phb)) {
53		pcibios_free_controller(phb);
54		return -ENODEV;
55	}
56
57	/* Process "ranges" property */
58	pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
59
60	/* Init pci_dn data structures */
61	pci_devs_phb_init_dynamic(phb);
62
63	/* Create EEH PE for the PHB */
64	eeh_phb_pe_create(phb);
65
66	/* Scan the bus */
67	pcibios_scan_phb(phb);
68	if (phb->bus == NULL)
69		return -ENXIO;
70
71	/* Claim resources. This might need some rework as well depending
72	 * whether we are doing probe-only or not, like assigning unassigned
73	 * resources etc...
74	 */
75	pcibios_claim_one_bus(phb->bus);
76
77	/* Add probed PCI devices to the device model */
78	pci_bus_add_devices(phb->bus);
79
80	return 0;
81}
82
83static const struct of_device_id of_pci_phb_ids[] = {
84	{ .type = "pci", },
85	{ .type = "pcix", },
86	{ .type = "pcie", },
87	{ .type = "pciex", },
88	{ .type = "ht", },
89	{}
90};
91
92static struct platform_driver of_pci_phb_driver = {
93	.probe = of_pci_phb_probe,
94	.driver = {
95		.name = "of-pci",
96		.of_match_table = of_pci_phb_ids,
97	},
98};
99
100builtin_platform_driver(of_pci_phb_driver);
101
102#endif /* CONFIG_PPC_OF_PLATFORM_PCI */
103