4 * Copyright (C) 2001 Todd Inglett, IBM Corporation
6 * PCI manipulation via device_nodes.
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.
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.
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
22 #include <linux/kernel.h>
23 #include <linux/pci.h>
24 #include <linux/string.h>
25 #include <linux/export.h>
26 #include <linux/init.h>
27 #include <linux/gfp.h>
31 #include <asm/pci-bridge.h>
32 #include <asm/ppc-pci.h>
33 #include <asm/firmware.h>
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.
39 void * __devinit
update_dn_pci_info(struct device_node
*dn
, void *data
)
41 struct pci_controller
*phb
= data
;
43 of_get_property(dn
, "ibm,pci-config-space-type", NULL
);
47 pdn
= zalloc_maybe_bootmem(sizeof(*pdn
), GFP_KERNEL
);
53 regs
= of_get_property(dn
, "reg", NULL
);
55 /* First register entry is addr (00BBSS00) */
56 pdn
->busno
= (regs
[0] >> 16) & 0xff;
57 pdn
->devfn
= (regs
[0] >> 8) & 0xff;
60 pdn
->pci_ext_config_space
= (type
&& *type
== 1);
65 * Traverse a device tree stopping each PCI device in the tree.
66 * This is done depth first. As each node is processed, a "pre"
67 * function is called and the children are processed recursively.
69 * The "pre" func returns a value. If non-zero is returned from
70 * the "pre" func, the traversal stops and this value is returned.
71 * This return value is useful when using traverse as a method of
74 * NOTE: we do not run the func for devices that do not appear to
75 * be PCI except for the start node which we assume (this is good
76 * because the start node is often a phb which may be missing PCI
78 * We use the class-code as an indicator. If we run into
79 * one of these nodes we also assume its siblings are non-pci for
82 void *traverse_pci_devices(struct device_node
*start
, traverse_func pre
,
85 struct device_node
*dn
, *nextdn
;
88 /* We started with a phb, iterate all childs */
89 for (dn
= start
->child
; dn
; dn
= nextdn
) {
94 classp
= of_get_property(dn
, "class-code", NULL
);
95 class = classp
? *classp
: 0;
97 if (pre
&& ((ret
= pre(dn
, data
)) != NULL
))
100 /* If we are a PCI bridge, go down */
101 if (dn
->child
&& ((class >> 8) == PCI_CLASS_BRIDGE_PCI
||
102 (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS
))
103 /* Depth first...do children */
105 else if (dn
->sibling
)
106 /* ok, try next sibling instead. */
107 nextdn
= dn
->sibling
;
109 /* Walk up to next valid sibling. */
114 } while (dn
->sibling
== NULL
);
115 nextdn
= dn
->sibling
;
122 * pci_devs_phb_init_dynamic - setup pci devices under this PHB
123 * phb: pci-to-host bridge (top-level bridge connecting to cpu)
125 * This routine is called both during boot, (before the memory
126 * subsystem is set up, before kmalloc is valid) and during the
127 * dynamic lpar operation of adding a PHB to a running system.
129 void __devinit
pci_devs_phb_init_dynamic(struct pci_controller
*phb
)
131 struct device_node
*dn
= phb
->dn
;
134 /* PHB nodes themselves must not match */
135 update_dn_pci_info(dn
, phb
);
138 pdn
->devfn
= pdn
->busno
= -1;
142 /* Update dn->phb ptrs for new phb and children devices */
143 traverse_pci_devices(dn
, update_dn_pci_info
, phb
);
147 * pci_devs_phb_init - Initialize phbs and pci devs under them.
149 * This routine walks over all phb's (pci-host bridges) on the
150 * system, and sets up assorted pci-related structures
151 * (including pci info in the device node structs) for each
152 * pci device found underneath. This routine runs once,
153 * early in the boot sequence.
155 void __init
pci_devs_phb_init(void)
157 struct pci_controller
*phb
, *tmp
;
159 /* This must be done first so the device nodes have valid pci info! */
160 list_for_each_entry_safe(phb
, tmp
, &hose_list
, list_node
)
161 pci_devs_phb_init_dynamic(phb
);