diff options
author | Paul Mackerras <paulus@samba.org> | 2005-11-14 01:30:17 -0500 |
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committer | Paul Mackerras <paulus@samba.org> | 2005-11-14 01:30:17 -0500 |
commit | 7568cb4ef6c507164b65b01f972a3bd026898ae1 (patch) | |
tree | ba608f4c84d8765d5a1491c345f6dc265b5ec4ea /arch/powerpc/kernel/pci_dn.c | |
parent | c55377ee73f6efeb373ae06f6e918d87660b4852 (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.c | 230 |
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 | */ | ||
39 | static 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 | */ | ||
85 | void *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 | */ | ||
131 | void __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 | */ | ||
152 | static 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 | */ | ||
176 | struct 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 | } | ||
187 | EXPORT_SYMBOL(fetch_dev_dn); | ||
188 | |||
189 | static 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 | |||
208 | static 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 | */ | ||
221 | void __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 | } | ||