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1da177e4 LT |
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 | ||
27 | #include <asm/io.h> | |
28 | #include <asm/prom.h> | |
29 | #include <asm/pci-bridge.h> | |
30 | #include <asm/pSeries_reconfig.h> | |
31 | ||
32 | #include "pci.h" | |
33 | ||
34 | /* | |
35 | * Traverse_func that inits the PCI fields of the device node. | |
36 | * NOTE: this *must* be done before read/write config to the device. | |
37 | */ | |
38 | static void * __devinit update_dn_pci_info(struct device_node *dn, void *data) | |
39 | { | |
40 | struct pci_controller *phb = data; | |
41 | int *type = (int *)get_property(dn, "ibm,pci-config-space-type", NULL); | |
42 | u32 *regs; | |
43 | ||
44 | dn->phb = phb; | |
45 | regs = (u32 *)get_property(dn, "reg", NULL); | |
46 | if (regs) { | |
47 | /* First register entry is addr (00BBSS00) */ | |
48 | dn->busno = (regs[0] >> 16) & 0xff; | |
49 | dn->devfn = (regs[0] >> 8) & 0xff; | |
50 | } | |
51 | ||
52 | dn->pci_ext_config_space = (type && *type == 1); | |
53 | return NULL; | |
54 | } | |
55 | ||
56 | /* | |
57 | * Traverse a device tree stopping each PCI device in the tree. | |
58 | * This is done depth first. As each node is processed, a "pre" | |
59 | * function is called and the children are processed recursively. | |
60 | * | |
61 | * The "pre" func returns a value. If non-zero is returned from | |
62 | * the "pre" func, the traversal stops and this value is returned. | |
63 | * This return value is useful when using traverse as a method of | |
64 | * finding a device. | |
65 | * | |
66 | * NOTE: we do not run the func for devices that do not appear to | |
67 | * be PCI except for the start node which we assume (this is good | |
68 | * because the start node is often a phb which may be missing PCI | |
69 | * properties). | |
70 | * We use the class-code as an indicator. If we run into | |
71 | * one of these nodes we also assume its siblings are non-pci for | |
72 | * performance. | |
73 | */ | |
74 | void *traverse_pci_devices(struct device_node *start, traverse_func pre, | |
75 | void *data) | |
76 | { | |
77 | struct device_node *dn, *nextdn; | |
78 | void *ret; | |
79 | ||
80 | /* We started with a phb, iterate all childs */ | |
81 | for (dn = start->child; dn; dn = nextdn) { | |
82 | u32 *classp, class; | |
83 | ||
84 | nextdn = NULL; | |
85 | classp = (u32 *)get_property(dn, "class-code", NULL); | |
86 | class = classp ? *classp : 0; | |
87 | ||
88 | if (pre && ((ret = pre(dn, data)) != NULL)) | |
89 | return ret; | |
90 | ||
91 | /* If we are a PCI bridge, go down */ | |
92 | if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI || | |
93 | (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS)) | |
94 | /* Depth first...do children */ | |
95 | nextdn = dn->child; | |
96 | else if (dn->sibling) | |
97 | /* ok, try next sibling instead. */ | |
98 | nextdn = dn->sibling; | |
99 | if (!nextdn) { | |
100 | /* Walk up to next valid sibling. */ | |
101 | do { | |
102 | dn = dn->parent; | |
103 | if (dn == start) | |
104 | return NULL; | |
105 | } while (dn->sibling == NULL); | |
106 | nextdn = dn->sibling; | |
107 | } | |
108 | } | |
109 | return NULL; | |
110 | } | |
111 | ||
112 | void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb) | |
113 | { | |
114 | struct device_node * dn = (struct device_node *) phb->arch_data; | |
115 | ||
116 | /* PHB nodes themselves must not match */ | |
117 | dn->devfn = dn->busno = -1; | |
118 | dn->phb = phb; | |
119 | ||
120 | /* Update dn->phb ptrs for new phb and children devices */ | |
121 | traverse_pci_devices(dn, update_dn_pci_info, phb); | |
122 | } | |
123 | ||
124 | /* | |
125 | * Traversal func that looks for a <busno,devfcn> value. | |
126 | * If found, the device_node is returned (thus terminating the traversal). | |
127 | */ | |
128 | static void *is_devfn_node(struct device_node *dn, void *data) | |
129 | { | |
130 | int busno = ((unsigned long)data >> 8) & 0xff; | |
131 | int devfn = ((unsigned long)data) & 0xff; | |
132 | ||
133 | return ((devfn == dn->devfn) && (busno == dn->busno)) ? dn : NULL; | |
134 | } | |
135 | ||
136 | /* | |
137 | * This is the "slow" path for looking up a device_node from a | |
138 | * pci_dev. It will hunt for the device under its parent's | |
139 | * phb and then update sysdata for a future fastpath. | |
140 | * | |
141 | * It may also do fixups on the actual device since this happens | |
142 | * on the first read/write. | |
143 | * | |
144 | * Note that it also must deal with devices that don't exist. | |
145 | * In this case it may probe for real hardware ("just in case") | |
146 | * and add a device_node to the device tree if necessary. | |
147 | * | |
148 | */ | |
149 | struct device_node *fetch_dev_dn(struct pci_dev *dev) | |
150 | { | |
151 | struct device_node *orig_dn = dev->sysdata; | |
152 | struct pci_controller *phb = orig_dn->phb; /* assume same phb as orig_dn */ | |
153 | struct device_node *phb_dn; | |
154 | struct device_node *dn; | |
155 | unsigned long searchval = (dev->bus->number << 8) | dev->devfn; | |
156 | ||
157 | phb_dn = phb->arch_data; | |
158 | dn = traverse_pci_devices(phb_dn, is_devfn_node, (void *)searchval); | |
159 | if (dn) | |
160 | dev->sysdata = dn; | |
161 | return dn; | |
162 | } | |
163 | EXPORT_SYMBOL(fetch_dev_dn); | |
164 | ||
165 | static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node) | |
166 | { | |
167 | struct device_node *np = node; | |
168 | int err = NOTIFY_OK; | |
169 | ||
170 | switch (action) { | |
171 | case PSERIES_RECONFIG_ADD: | |
172 | update_dn_pci_info(np, np->parent->phb); | |
173 | break; | |
174 | default: | |
175 | err = NOTIFY_DONE; | |
176 | break; | |
177 | } | |
178 | return err; | |
179 | } | |
180 | ||
181 | static struct notifier_block pci_dn_reconfig_nb = { | |
182 | .notifier_call = pci_dn_reconfig_notifier, | |
183 | }; | |
184 | ||
185 | /* | |
186 | * Actually initialize the phbs. | |
187 | * The buswalk on this phb has not happened yet. | |
188 | */ | |
189 | void __init pci_devs_phb_init(void) | |
190 | { | |
191 | struct pci_controller *phb, *tmp; | |
192 | ||
193 | /* This must be done first so the device nodes have valid pci info! */ | |
194 | list_for_each_entry_safe(phb, tmp, &hose_list, list_node) | |
195 | pci_devs_phb_init_dynamic(phb); | |
196 | ||
197 | pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb); | |
198 | } |