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/of.h>
17 #include <linux/of_device.h>
18 #include <linux/of_platform.h>
19 #include <linux/atomic.h>
20 
21 #include <asm/errno.h>
22 #include <asm/topology.h>
23 #include <asm/pci-bridge.h>
24 #include <asm/ppc-pci.h>
25 #include <asm/eeh.h>
26 
27 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
28 
29 /* The probing of PCI controllers from of_platform is currently
30  * 64 bits only, mostly due to gratuitous differences between
31  * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
32  * lacking some bits needed here.
33  */
34 
35 static int of_pci_phb_probe(struct platform_device *dev)
36 {
37 	struct pci_controller *phb;
38 
39 	/* Check if we can do that ... */
40 	if (ppc_md.pci_setup_phb == NULL)
41 		return -ENODEV;
42 
43 	pr_info("Setting up PCI bus %pOF\n", dev->dev.of_node);
44 
45 	/* Alloc and setup PHB data structure */
46 	phb = pcibios_alloc_controller(dev->dev.of_node);
47 	if (!phb)
48 		return -ENODEV;
49 
50 	/* Setup parent in sysfs */
51 	phb->parent = &dev->dev;
52 
53 	/* Setup the PHB using arch provided callback */
54 	if (ppc_md.pci_setup_phb(phb)) {
55 		pcibios_free_controller(phb);
56 		return -ENODEV;
57 	}
58 
59 	/* Process "ranges" property */
60 	pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
61 
62 	/* Init pci_dn data structures */
63 	pci_devs_phb_init_dynamic(phb);
64 
65 	/* Create EEH PE for the PHB */
66 	eeh_phb_pe_create(phb);
67 
68 	/* Scan the bus */
69 	pcibios_scan_phb(phb);
70 	if (phb->bus == NULL)
71 		return -ENXIO;
72 
73 	/* Claim resources. This might need some rework as well depending
74 	 * whether we are doing probe-only or not, like assigning unassigned
75 	 * resources etc...
76 	 */
77 	pcibios_claim_one_bus(phb->bus);
78 
79 	/* Add probed PCI devices to the device model */
80 	pci_bus_add_devices(phb->bus);
81 
82 	return 0;
83 }
84 
85 static const struct of_device_id of_pci_phb_ids[] = {
86 	{ .type = "pci", },
87 	{ .type = "pcix", },
88 	{ .type = "pcie", },
89 	{ .type = "pciex", },
90 	{ .type = "ht", },
91 	{}
92 };
93 
94 static struct platform_driver of_pci_phb_driver = {
95 	.probe = of_pci_phb_probe,
96 	.driver = {
97 		.name = "of-pci",
98 		.of_match_table = of_pci_phb_ids,
99 	},
100 };
101 
102 builtin_platform_driver(of_pci_phb_driver);
103 
104 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */
105