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Linux/arch/powerpc/kernel/pci_dn.c

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  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/export.h>
 26 #include <linux/init.h>
 27 #include <linux/gfp.h>
 28 
 29 #include <asm/io.h>
 30 #include <asm/prom.h>
 31 #include <asm/pci-bridge.h>
 32 #include <asm/ppc-pci.h>
 33 #include <asm/firmware.h>
 34 
 35 struct pci_dn *pci_get_pdn(struct pci_dev *pdev)
 36 {
 37         struct device_node *dn = pci_device_to_OF_node(pdev);
 38         if (!dn)
 39                 return NULL;
 40         return PCI_DN(dn);
 41 }
 42 
 43 /*
 44  * Traverse_func that inits the PCI fields of the device node.
 45  * NOTE: this *must* be done before read/write config to the device.
 46  */
 47 void *update_dn_pci_info(struct device_node *dn, void *data)
 48 {
 49         struct pci_controller *phb = data;
 50         const __be32 *type = of_get_property(dn, "ibm,pci-config-space-type", NULL);
 51         const __be32 *regs;
 52         struct pci_dn *pdn;
 53 
 54         pdn = zalloc_maybe_bootmem(sizeof(*pdn), GFP_KERNEL);
 55         if (pdn == NULL)
 56                 return NULL;
 57         dn->data = pdn;
 58         pdn->node = dn;
 59         pdn->phb = phb;
 60 #ifdef CONFIG_PPC_POWERNV
 61         pdn->pe_number = IODA_INVALID_PE;
 62 #endif
 63         regs = of_get_property(dn, "reg", NULL);
 64         if (regs) {
 65                 u32 addr = of_read_number(regs, 1);
 66 
 67                 /* First register entry is addr (00BBSS00)  */
 68                 pdn->busno = (addr >> 16) & 0xff;
 69                 pdn->devfn = (addr >> 8) & 0xff;
 70         }
 71 
 72         pdn->pci_ext_config_space = (type && of_read_number(type, 1) == 1);
 73         return NULL;
 74 }
 75 
 76 /*
 77  * Traverse a device tree stopping each PCI device in the tree.
 78  * This is done depth first.  As each node is processed, a "pre"
 79  * function is called and the children are processed recursively.
 80  *
 81  * The "pre" func returns a value.  If non-zero is returned from
 82  * the "pre" func, the traversal stops and this value is returned.
 83  * This return value is useful when using traverse as a method of
 84  * finding a device.
 85  *
 86  * NOTE: we do not run the func for devices that do not appear to
 87  * be PCI except for the start node which we assume (this is good
 88  * because the start node is often a phb which may be missing PCI
 89  * properties).
 90  * We use the class-code as an indicator. If we run into
 91  * one of these nodes we also assume its siblings are non-pci for
 92  * performance.
 93  */
 94 void *traverse_pci_devices(struct device_node *start, traverse_func pre,
 95                 void *data)
 96 {
 97         struct device_node *dn, *nextdn;
 98         void *ret;
 99 
100         /* We started with a phb, iterate all childs */
101         for (dn = start->child; dn; dn = nextdn) {
102                 const __be32 *classp;
103                 u32 class = 0;
104 
105                 nextdn = NULL;
106                 classp = of_get_property(dn, "class-code", NULL);
107                 if (classp)
108                         class = of_read_number(classp, 1);
109 
110                 if (pre && ((ret = pre(dn, data)) != NULL))
111                         return ret;
112 
113                 /* If we are a PCI bridge, go down */
114                 if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI ||
115                                   (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
116                         /* Depth first...do children */
117                         nextdn = dn->child;
118                 else if (dn->sibling)
119                         /* ok, try next sibling instead. */
120                         nextdn = dn->sibling;
121                 if (!nextdn) {
122                         /* Walk up to next valid sibling. */
123                         do {
124                                 dn = dn->parent;
125                                 if (dn == start)
126                                         return NULL;
127                         } while (dn->sibling == NULL);
128                         nextdn = dn->sibling;
129                 }
130         }
131         return NULL;
132 }
133 
134 /** 
135  * pci_devs_phb_init_dynamic - setup pci devices under this PHB
136  * phb: pci-to-host bridge (top-level bridge connecting to cpu)
137  *
138  * This routine is called both during boot, (before the memory
139  * subsystem is set up, before kmalloc is valid) and during the 
140  * dynamic lpar operation of adding a PHB to a running system.
141  */
142 void pci_devs_phb_init_dynamic(struct pci_controller *phb)
143 {
144         struct device_node *dn = phb->dn;
145         struct pci_dn *pdn;
146 
147         /* PHB nodes themselves must not match */
148         update_dn_pci_info(dn, phb);
149         pdn = dn->data;
150         if (pdn)
151                 pdn->devfn = pdn->busno = -1;
152 
153         /* Update dn->phb ptrs for new phb and children devices */
154         traverse_pci_devices(dn, update_dn_pci_info, phb);
155 }
156 
157 /** 
158  * pci_devs_phb_init - Initialize phbs and pci devs under them.
159  * 
160  * This routine walks over all phb's (pci-host bridges) on the
161  * system, and sets up assorted pci-related structures 
162  * (including pci info in the device node structs) for each
163  * pci device found underneath.  This routine runs once,
164  * early in the boot sequence.
165  */
166 void __init pci_devs_phb_init(void)
167 {
168         struct pci_controller *phb, *tmp;
169 
170         /* This must be done first so the device nodes have valid pci info! */
171         list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
172                 pci_devs_phb_init_dynamic(phb);
173 }
174 

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