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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> | |
66b15db6 | 25 | #include <linux/export.h> |
1da177e4 | 26 | #include <linux/init.h> |
5a0e3ad6 | 27 | #include <linux/gfp.h> |
1da177e4 LT |
28 | |
29 | #include <asm/io.h> | |
30 | #include <asm/prom.h> | |
31 | #include <asm/pci-bridge.h> | |
d387899f | 32 | #include <asm/ppc-pci.h> |
095eed4f | 33 | #include <asm/firmware.h> |
1da177e4 LT |
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 | */ | |
2eb4afb6 | 39 | void * __devinit update_dn_pci_info(struct device_node *dn, void *data) |
1da177e4 LT |
40 | { |
41 | struct pci_controller *phb = data; | |
e2eb6392 SR |
42 | const int *type = |
43 | of_get_property(dn, "ibm,pci-config-space-type", NULL); | |
a7f67bdf | 44 | const u32 *regs; |
1635317f PM |
45 | struct pci_dn *pdn; |
46 | ||
a56555e5 | 47 | pdn = zalloc_maybe_bootmem(sizeof(*pdn), GFP_KERNEL); |
1635317f PM |
48 | if (pdn == NULL) |
49 | return NULL; | |
1635317f PM |
50 | dn->data = pdn; |
51 | pdn->node = dn; | |
52 | pdn->phb = phb; | |
184cd4a3 BH |
53 | #ifdef CONFIG_PPC_POWERNV |
54 | pdn->pe_number = IODA_INVALID_PE; | |
55 | #endif | |
e2eb6392 | 56 | regs = of_get_property(dn, "reg", NULL); |
1da177e4 LT |
57 | if (regs) { |
58 | /* First register entry is addr (00BBSS00) */ | |
1635317f PM |
59 | pdn->busno = (regs[0] >> 16) & 0xff; |
60 | pdn->devfn = (regs[0] >> 8) & 0xff; | |
1da177e4 LT |
61 | } |
62 | ||
1635317f | 63 | pdn->pci_ext_config_space = (type && *type == 1); |
1da177e4 LT |
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) { | |
a7f67bdf JK |
93 | const u32 *classp; |
94 | u32 class; | |
1da177e4 LT |
95 | |
96 | nextdn = NULL; | |
e2eb6392 | 97 | classp = of_get_property(dn, "class-code", NULL); |
1da177e4 LT |
98 | class = classp ? *classp : 0; |
99 | ||
100 | if (pre && ((ret = pre(dn, data)) != NULL)) | |
101 | return ret; | |
102 | ||
103 | /* If we are a PCI bridge, go down */ | |
104 | if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI || | |
105 | (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS)) | |
106 | /* Depth first...do children */ | |
107 | nextdn = dn->child; | |
108 | else if (dn->sibling) | |
109 | /* ok, try next sibling instead. */ | |
110 | nextdn = dn->sibling; | |
111 | if (!nextdn) { | |
112 | /* Walk up to next valid sibling. */ | |
113 | do { | |
114 | dn = dn->parent; | |
115 | if (dn == start) | |
116 | return NULL; | |
117 | } while (dn->sibling == NULL); | |
118 | nextdn = dn->sibling; | |
119 | } | |
120 | } | |
121 | return NULL; | |
122 | } | |
123 | ||
18126f35 LV |
124 | /** |
125 | * pci_devs_phb_init_dynamic - setup pci devices under this PHB | |
126 | * phb: pci-to-host bridge (top-level bridge connecting to cpu) | |
127 | * | |
128 | * This routine is called both during boot, (before the memory | |
129 | * subsystem is set up, before kmalloc is valid) and during the | |
130 | * dynamic lpar operation of adding a PHB to a running system. | |
131 | */ | |
1da177e4 LT |
132 | void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb) |
133 | { | |
44ef3390 | 134 | struct device_node *dn = phb->dn; |
1635317f | 135 | struct pci_dn *pdn; |
1da177e4 LT |
136 | |
137 | /* PHB nodes themselves must not match */ | |
1635317f PM |
138 | update_dn_pci_info(dn, phb); |
139 | pdn = dn->data; | |
140 | if (pdn) { | |
141 | pdn->devfn = pdn->busno = -1; | |
142 | pdn->phb = phb; | |
143 | } | |
1da177e4 LT |
144 | |
145 | /* Update dn->phb ptrs for new phb and children devices */ | |
146 | traverse_pci_devices(dn, update_dn_pci_info, phb); | |
147 | } | |
148 | ||
18126f35 LV |
149 | /** |
150 | * pci_devs_phb_init - Initialize phbs and pci devs under them. | |
151 | * | |
152 | * This routine walks over all phb's (pci-host bridges) on the | |
153 | * system, and sets up assorted pci-related structures | |
154 | * (including pci info in the device node structs) for each | |
155 | * pci device found underneath. This routine runs once, | |
156 | * early in the boot sequence. | |
1da177e4 LT |
157 | */ |
158 | void __init pci_devs_phb_init(void) | |
159 | { | |
160 | struct pci_controller *phb, *tmp; | |
161 | ||
162 | /* This must be done first so the device nodes have valid pci info! */ | |
163 | list_for_each_entry_safe(phb, tmp, &hose_list, list_node) | |
164 | pci_devs_phb_init_dynamic(phb); | |
1da177e4 | 165 | } |