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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> | |
1635317f PM |
26 | #include <linux/slab.h> |
27 | #include <linux/bootmem.h> | |
1da177e4 LT |
28 | |
29 | #include <asm/io.h> | |
30 | #include <asm/prom.h> | |
31 | #include <asm/pci-bridge.h> | |
32 | #include <asm/pSeries_reconfig.h> | |
d387899f | 33 | #include <asm/ppc-pci.h> |
095eed4f | 34 | #include <asm/firmware.h> |
1da177e4 LT |
35 | |
36 | /* | |
37 | * Traverse_func that inits the PCI fields of the device node. | |
38 | * NOTE: this *must* be done before read/write config to the device. | |
39 | */ | |
40 | static void * __devinit update_dn_pci_info(struct device_node *dn, void *data) | |
41 | { | |
42 | struct pci_controller *phb = data; | |
43 | int *type = (int *)get_property(dn, "ibm,pci-config-space-type", NULL); | |
44 | u32 *regs; | |
1635317f PM |
45 | struct pci_dn *pdn; |
46 | ||
18126f35 | 47 | if (mem_init_done) |
1635317f PM |
48 | pdn = kmalloc(sizeof(*pdn), GFP_KERNEL); |
49 | else | |
50 | pdn = alloc_bootmem(sizeof(*pdn)); | |
51 | if (pdn == NULL) | |
52 | return NULL; | |
53 | memset(pdn, 0, sizeof(*pdn)); | |
54 | dn->data = pdn; | |
55 | pdn->node = dn; | |
56 | pdn->phb = phb; | |
1da177e4 LT |
57 | regs = (u32 *)get_property(dn, "reg", NULL); |
58 | if (regs) { | |
59 | /* First register entry is addr (00BBSS00) */ | |
1635317f PM |
60 | pdn->busno = (regs[0] >> 16) & 0xff; |
61 | pdn->devfn = (regs[0] >> 8) & 0xff; | |
1da177e4 | 62 | } |
095eed4f SR |
63 | if (firmware_has_feature(FW_FEATURE_ISERIES)) { |
64 | u32 *busp = (u32 *)get_property(dn, "linux,subbus", NULL); | |
65 | if (busp) | |
66 | pdn->bussubno = *busp; | |
67 | } | |
1da177e4 | 68 | |
1635317f | 69 | pdn->pci_ext_config_space = (type && *type == 1); |
1da177e4 LT |
70 | return NULL; |
71 | } | |
72 | ||
73 | /* | |
74 | * Traverse a device tree stopping each PCI device in the tree. | |
75 | * This is done depth first. As each node is processed, a "pre" | |
76 | * function is called and the children are processed recursively. | |
77 | * | |
78 | * The "pre" func returns a value. If non-zero is returned from | |
79 | * the "pre" func, the traversal stops and this value is returned. | |
80 | * This return value is useful when using traverse as a method of | |
81 | * finding a device. | |
82 | * | |
83 | * NOTE: we do not run the func for devices that do not appear to | |
84 | * be PCI except for the start node which we assume (this is good | |
85 | * because the start node is often a phb which may be missing PCI | |
86 | * properties). | |
87 | * We use the class-code as an indicator. If we run into | |
88 | * one of these nodes we also assume its siblings are non-pci for | |
89 | * performance. | |
90 | */ | |
91 | void *traverse_pci_devices(struct device_node *start, traverse_func pre, | |
92 | void *data) | |
93 | { | |
94 | struct device_node *dn, *nextdn; | |
95 | void *ret; | |
96 | ||
97 | /* We started with a phb, iterate all childs */ | |
98 | for (dn = start->child; dn; dn = nextdn) { | |
99 | u32 *classp, class; | |
100 | ||
101 | nextdn = NULL; | |
102 | classp = (u32 *)get_property(dn, "class-code", NULL); | |
103 | class = classp ? *classp : 0; | |
104 | ||
105 | if (pre && ((ret = pre(dn, data)) != NULL)) | |
106 | return ret; | |
107 | ||
108 | /* If we are a PCI bridge, go down */ | |
109 | if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI || | |
110 | (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS)) | |
111 | /* Depth first...do children */ | |
112 | nextdn = dn->child; | |
113 | else if (dn->sibling) | |
114 | /* ok, try next sibling instead. */ | |
115 | nextdn = dn->sibling; | |
116 | if (!nextdn) { | |
117 | /* Walk up to next valid sibling. */ | |
118 | do { | |
119 | dn = dn->parent; | |
120 | if (dn == start) | |
121 | return NULL; | |
122 | } while (dn->sibling == NULL); | |
123 | nextdn = dn->sibling; | |
124 | } | |
125 | } | |
126 | return NULL; | |
127 | } | |
128 | ||
18126f35 LV |
129 | /** |
130 | * pci_devs_phb_init_dynamic - setup pci devices under this PHB | |
131 | * phb: pci-to-host bridge (top-level bridge connecting to cpu) | |
132 | * | |
133 | * This routine is called both during boot, (before the memory | |
134 | * subsystem is set up, before kmalloc is valid) and during the | |
135 | * dynamic lpar operation of adding a PHB to a running system. | |
136 | */ | |
1da177e4 LT |
137 | void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb) |
138 | { | |
139 | struct device_node * dn = (struct device_node *) phb->arch_data; | |
1635317f | 140 | struct pci_dn *pdn; |
1da177e4 LT |
141 | |
142 | /* PHB nodes themselves must not match */ | |
1635317f PM |
143 | update_dn_pci_info(dn, phb); |
144 | pdn = dn->data; | |
145 | if (pdn) { | |
146 | pdn->devfn = pdn->busno = -1; | |
147 | pdn->phb = phb; | |
148 | } | |
1da177e4 LT |
149 | |
150 | /* Update dn->phb ptrs for new phb and children devices */ | |
151 | traverse_pci_devices(dn, update_dn_pci_info, phb); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Traversal func that looks for a <busno,devfcn> value. | |
1635317f | 156 | * If found, the pci_dn is returned (thus terminating the traversal). |
1da177e4 LT |
157 | */ |
158 | static void *is_devfn_node(struct device_node *dn, void *data) | |
159 | { | |
160 | int busno = ((unsigned long)data >> 8) & 0xff; | |
161 | int devfn = ((unsigned long)data) & 0xff; | |
1635317f | 162 | struct pci_dn *pci = dn->data; |
1da177e4 | 163 | |
1635317f PM |
164 | if (pci && (devfn == pci->devfn) && (busno == pci->busno)) |
165 | return dn; | |
166 | return NULL; | |
1da177e4 LT |
167 | } |
168 | ||
169 | /* | |
170 | * This is the "slow" path for looking up a device_node from a | |
171 | * pci_dev. It will hunt for the device under its parent's | |
172 | * phb and then update sysdata for a future fastpath. | |
173 | * | |
174 | * It may also do fixups on the actual device since this happens | |
175 | * on the first read/write. | |
176 | * | |
177 | * Note that it also must deal with devices that don't exist. | |
178 | * In this case it may probe for real hardware ("just in case") | |
179 | * and add a device_node to the device tree if necessary. | |
180 | * | |
181 | */ | |
182 | struct device_node *fetch_dev_dn(struct pci_dev *dev) | |
183 | { | |
184 | struct device_node *orig_dn = dev->sysdata; | |
1da177e4 LT |
185 | struct device_node *dn; |
186 | unsigned long searchval = (dev->bus->number << 8) | dev->devfn; | |
187 | ||
1635317f | 188 | dn = traverse_pci_devices(orig_dn, is_devfn_node, (void *)searchval); |
1da177e4 LT |
189 | if (dn) |
190 | dev->sysdata = dn; | |
191 | return dn; | |
192 | } | |
193 | EXPORT_SYMBOL(fetch_dev_dn); | |
194 | ||
195 | static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node) | |
196 | { | |
197 | struct device_node *np = node; | |
8902e87f | 198 | struct pci_dn *pci = NULL; |
1da177e4 LT |
199 | int err = NOTIFY_OK; |
200 | ||
201 | switch (action) { | |
202 | case PSERIES_RECONFIG_ADD: | |
1635317f | 203 | pci = np->parent->data; |
8902e87f JR |
204 | if (pci) |
205 | update_dn_pci_info(np, pci->phb); | |
1da177e4 LT |
206 | break; |
207 | default: | |
208 | err = NOTIFY_DONE; | |
209 | break; | |
210 | } | |
211 | return err; | |
212 | } | |
213 | ||
214 | static struct notifier_block pci_dn_reconfig_nb = { | |
215 | .notifier_call = pci_dn_reconfig_notifier, | |
216 | }; | |
217 | ||
18126f35 LV |
218 | /** |
219 | * pci_devs_phb_init - Initialize phbs and pci devs under them. | |
220 | * | |
221 | * This routine walks over all phb's (pci-host bridges) on the | |
222 | * system, and sets up assorted pci-related structures | |
223 | * (including pci info in the device node structs) for each | |
224 | * pci device found underneath. This routine runs once, | |
225 | * early in the boot sequence. | |
1da177e4 LT |
226 | */ |
227 | void __init pci_devs_phb_init(void) | |
228 | { | |
229 | struct pci_controller *phb, *tmp; | |
230 | ||
231 | /* This must be done first so the device nodes have valid pci info! */ | |
232 | list_for_each_entry_safe(phb, tmp, &hose_list, list_node) | |
233 | pci_devs_phb_init_dynamic(phb); | |
234 | ||
235 | pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb); | |
236 | } |