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authorPaul Mackerras <paulus@samba.org>2005-11-14 01:30:17 -0500
committerPaul Mackerras <paulus@samba.org>2005-11-14 01:30:17 -0500
commit7568cb4ef6c507164b65b01f972a3bd026898ae1 (patch)
treeba608f4c84d8765d5a1491c345f6dc265b5ec4ea /arch/powerpc/kernel/pci_dn.c
parentc55377ee73f6efeb373ae06f6e918d87660b4852 (diff)
powerpc: Move most remaining ppc64 files over to arch/powerpc
Also deletes files in arch/ppc64 that are no longer used now that we don't compile with ARCH=ppc64 any more. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/pci_dn.c')
-rw-r--r--arch/powerpc/kernel/pci_dn.c230
1 files changed, 230 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
new file mode 100644
index 000000000000..12c4c9e9bbc7
--- /dev/null
+++ b/arch/powerpc/kernel/pci_dn.c
@@ -0,0 +1,230 @@
1/*
2 * pci_dn.c
3 *
4 * Copyright (C) 2001 Todd Inglett, IBM Corporation
5 *
6 * PCI manipulation via device_nodes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22#include <linux/kernel.h>
23#include <linux/pci.h>
24#include <linux/string.h>
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <linux/bootmem.h>
28
29#include <asm/io.h>
30#include <asm/prom.h>
31#include <asm/pci-bridge.h>
32#include <asm/pSeries_reconfig.h>
33#include <asm/ppc-pci.h>
34
35/*
36 * Traverse_func that inits the PCI fields of the device node.
37 * NOTE: this *must* be done before read/write config to the device.
38 */
39static void * __devinit update_dn_pci_info(struct device_node *dn, void *data)
40{
41 struct pci_controller *phb = data;
42 int *type = (int *)get_property(dn, "ibm,pci-config-space-type", NULL);
43 u32 *regs;
44 struct pci_dn *pdn;
45
46 if (mem_init_done)
47 pdn = kmalloc(sizeof(*pdn), GFP_KERNEL);
48 else
49 pdn = alloc_bootmem(sizeof(*pdn));
50 if (pdn == NULL)
51 return NULL;
52 memset(pdn, 0, sizeof(*pdn));
53 dn->data = pdn;
54 pdn->node = dn;
55 pdn->phb = phb;
56 regs = (u32 *)get_property(dn, "reg", NULL);
57 if (regs) {
58 /* First register entry is addr (00BBSS00) */
59 pdn->busno = (regs[0] >> 16) & 0xff;
60 pdn->devfn = (regs[0] >> 8) & 0xff;
61 }
62
63 pdn->pci_ext_config_space = (type && *type == 1);
64 return NULL;
65}
66
67/*
68 * Traverse a device tree stopping each PCI device in the tree.
69 * This is done depth first. As each node is processed, a "pre"
70 * function is called and the children are processed recursively.
71 *
72 * The "pre" func returns a value. If non-zero is returned from
73 * the "pre" func, the traversal stops and this value is returned.
74 * This return value is useful when using traverse as a method of
75 * finding a device.
76 *
77 * NOTE: we do not run the func for devices that do not appear to
78 * be PCI except for the start node which we assume (this is good
79 * because the start node is often a phb which may be missing PCI
80 * properties).
81 * We use the class-code as an indicator. If we run into
82 * one of these nodes we also assume its siblings are non-pci for
83 * performance.
84 */
85void *traverse_pci_devices(struct device_node *start, traverse_func pre,
86 void *data)
87{
88 struct device_node *dn, *nextdn;
89 void *ret;
90
91 /* We started with a phb, iterate all childs */
92 for (dn = start->child; dn; dn = nextdn) {
93 u32 *classp, class;
94
95 nextdn = NULL;
96 classp = (u32 *)get_property(dn, "class-code", NULL);
97 class = classp ? *classp : 0;
98
99 if (pre && ((ret = pre(dn, data)) != NULL))
100 return ret;
101
102 /* If we are a PCI bridge, go down */
103 if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI ||
104 (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
105 /* Depth first...do children */
106 nextdn = dn->child;
107 else if (dn->sibling)
108 /* ok, try next sibling instead. */
109 nextdn = dn->sibling;
110 if (!nextdn) {
111 /* Walk up to next valid sibling. */
112 do {
113 dn = dn->parent;
114 if (dn == start)
115 return NULL;
116 } while (dn->sibling == NULL);
117 nextdn = dn->sibling;
118 }
119 }
120 return NULL;
121}
122
123/**
124 * pci_devs_phb_init_dynamic - setup pci devices under this PHB
125 * phb: pci-to-host bridge (top-level bridge connecting to cpu)
126 *
127 * This routine is called both during boot, (before the memory
128 * subsystem is set up, before kmalloc is valid) and during the
129 * dynamic lpar operation of adding a PHB to a running system.
130 */
131void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb)
132{
133 struct device_node * dn = (struct device_node *) phb->arch_data;
134 struct pci_dn *pdn;
135
136 /* PHB nodes themselves must not match */
137 update_dn_pci_info(dn, phb);
138 pdn = dn->data;
139 if (pdn) {
140 pdn->devfn = pdn->busno = -1;
141 pdn->phb = phb;
142 }
143
144 /* Update dn->phb ptrs for new phb and children devices */
145 traverse_pci_devices(dn, update_dn_pci_info, phb);
146}
147
148/*
149 * Traversal func that looks for a <busno,devfcn> value.
150 * If found, the pci_dn is returned (thus terminating the traversal).
151 */
152static void *is_devfn_node(struct device_node *dn, void *data)
153{
154 int busno = ((unsigned long)data >> 8) & 0xff;
155 int devfn = ((unsigned long)data) & 0xff;
156 struct pci_dn *pci = dn->data;
157
158 if (pci && (devfn == pci->devfn) && (busno == pci->busno))
159 return dn;
160 return NULL;
161}
162
163/*
164 * This is the "slow" path for looking up a device_node from a
165 * pci_dev. It will hunt for the device under its parent's
166 * phb and then update sysdata for a future fastpath.
167 *
168 * It may also do fixups on the actual device since this happens
169 * on the first read/write.
170 *
171 * Note that it also must deal with devices that don't exist.
172 * In this case it may probe for real hardware ("just in case")
173 * and add a device_node to the device tree if necessary.
174 *
175 */
176struct device_node *fetch_dev_dn(struct pci_dev *dev)
177{
178 struct device_node *orig_dn = dev->sysdata;
179 struct device_node *dn;
180 unsigned long searchval = (dev->bus->number << 8) | dev->devfn;
181
182 dn = traverse_pci_devices(orig_dn, is_devfn_node, (void *)searchval);
183 if (dn)
184 dev->sysdata = dn;
185 return dn;
186}
187EXPORT_SYMBOL(fetch_dev_dn);
188
189static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
190{
191 struct device_node *np = node;
192 struct pci_dn *pci = NULL;
193 int err = NOTIFY_OK;
194
195 switch (action) {
196 case PSERIES_RECONFIG_ADD:
197 pci = np->parent->data;
198 if (pci)
199 update_dn_pci_info(np, pci->phb);
200 break;
201 default:
202 err = NOTIFY_DONE;
203 break;
204 }
205 return err;
206}
207
208static struct notifier_block pci_dn_reconfig_nb = {
209 .notifier_call = pci_dn_reconfig_notifier,
210};
211
212/**
213 * pci_devs_phb_init - Initialize phbs and pci devs under them.
214 *
215 * This routine walks over all phb's (pci-host bridges) on the
216 * system, and sets up assorted pci-related structures
217 * (including pci info in the device node structs) for each
218 * pci device found underneath. This routine runs once,
219 * early in the boot sequence.
220 */
221void __init pci_devs_phb_init(void)
222{
223 struct pci_controller *phb, *tmp;
224
225 /* This must be done first so the device nodes have valid pci info! */
226 list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
227 pci_devs_phb_init_dynamic(phb);
228
229 pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);
230}