summaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/pseries/pci_dlpar.c
blob: 31481dc485de85f404f5adf07d558bc644f32742 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
/*
 * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
 * for RPA-compliant PPC64 platform.
 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
 * Copyright (C) 2005 International Business Machines
 *
 * Updates, 2005, John Rose <johnrose@austin.ibm.com>
 * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/pci.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
#include <asm/firmware.h>
#include <asm/eeh.h>

static struct pci_bus *
find_bus_among_children(struct pci_bus *bus,
                        struct device_node *dn)
{
	struct pci_bus *child = NULL;
	struct list_head *tmp;
	struct device_node *busdn;

	busdn = pci_bus_to_OF_node(bus);
	if (busdn == dn)
		return bus;

	list_for_each(tmp, &bus->children) {
		child = find_bus_among_children(pci_bus_b(tmp), dn);
		if (child)
			break;
	};
	return child;
}

struct pci_bus *
pcibios_find_pci_bus(struct device_node *dn)
{
	struct pci_dn *pdn = dn->data;

	if (!pdn  || !pdn->phb || !pdn->phb->bus)
		return NULL;

	return find_bus_among_children(pdn->phb->bus, dn);
}
EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);

/**
 * pcibios_remove_pci_devices - remove all devices under this bus
 *
 * Remove all of the PCI devices under this bus both from the
 * linux pci device tree, and from the powerpc EEH address cache.
 */
void
pcibios_remove_pci_devices(struct pci_bus *bus)
{
	struct pci_dev *dev, *tmp;

	list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
		eeh_remove_bus_device(dev);
		pci_remove_bus_device(dev);
	}
}
EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);

/* Must be called before pci_bus_add_devices */
void
pcibios_fixup_new_pci_devices(struct pci_bus *bus)
{
	struct pci_dev *dev;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		/* Skip already-added devices */
		if (!dev->is_added) {
			int i;

			/* Fill device archdata and setup iommu table */
			pcibios_setup_new_device(dev);

			pci_read_irq_line(dev);
			for (i = 0; i < PCI_NUM_RESOURCES; i++) {
				struct resource *r = &dev->resource[i];

				if (r->parent || !r->start || !r->flags)
					continue;
				pci_claim_resource(dev, i);
			}
		}
	}
}
EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices);

static int
pcibios_pci_config_bridge(struct pci_dev *dev)
{
	u8 sec_busno;
	struct pci_bus *child_bus;

	/* Get busno of downstream bus */
	pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);

	/* Add to children of PCI bridge dev->bus */
	child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
	if (!child_bus) {
		printk (KERN_ERR "%s: could not add second bus\n", __func__);
		return -EIO;
	}
	sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);

	pci_scan_child_bus(child_bus);

	/* Fixup new pci devices */
	pcibios_fixup_new_pci_devices(child_bus);

	/* Make the discovered devices available */
	pci_bus_add_devices(child_bus);

	eeh_add_device_tree_late(child_bus);
	return 0;
}

/**
 * pcibios_add_pci_devices - adds new pci devices to bus
 *
 * This routine will find and fixup new pci devices under
 * the indicated bus. This routine presumes that there
 * might already be some devices under this bridge, so
 * it carefully tries to add only new devices.  (And that
 * is how this routine differs from other, similar pcibios
 * routines.)
 */
void
pcibios_add_pci_devices(struct pci_bus * bus)
{
	int slotno, num, mode;
	struct pci_dev *dev;
	struct device_node *dn = pci_bus_to_OF_node(bus);

	eeh_add_device_tree_early(dn);

	mode = PCI_PROBE_NORMAL;
	if (ppc_md.pci_probe_mode)
		mode = ppc_md.pci_probe_mode(bus);

	if (mode == PCI_PROBE_DEVTREE) {
		/* use ofdt-based probe */
		of_scan_bus(dn, bus);
		if (!list_empty(&bus->devices)) {
			pcibios_fixup_new_pci_devices(bus);
			pci_bus_add_devices(bus);
			eeh_add_device_tree_late(bus);
		}
	} else if (mode == PCI_PROBE_NORMAL) {
		/* use legacy probe */
		slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
		num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
		if (num) {
			pcibios_fixup_new_pci_devices(bus);
			pci_bus_add_devices(bus);
			eeh_add_device_tree_late(bus);
		}

		list_for_each_entry(dev, &bus->devices, bus_list)
			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
				pcibios_pci_config_bridge(dev);
	}
}
EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);

struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
{
	struct pci_controller *phb;
	int primary;
	struct pci_bus *b;

	primary = list_empty(&hose_list);
	phb = pcibios_alloc_controller(dn);
	if (!phb)
		return NULL;
	rtas_setup_phb(phb);
	pci_process_bridge_OF_ranges(phb, dn, 0);

	pci_devs_phb_init_dynamic(phb);

	if (dn->child)
		eeh_add_device_tree_early(dn);

	scan_phb(phb);
	pcibios_allocate_bus_resources(phb->bus);
	pcibios_fixup_new_pci_devices(phb->bus);
	pci_bus_add_devices(phb->bus);
	eeh_add_device_tree_late(phb->bus);

	return phb;
}
EXPORT_SYMBOL_GPL(init_phb_dynamic);