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 
33 static 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 
83 static 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 
92 static 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 
100 builtin_platform_driver(of_pci_phb_driver);
101 
102 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */
103