203 lines
5.9 KiB
C
203 lines
5.9 KiB
C
/*
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* pci_dn.c
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*
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* Copyright (C) 2001 Todd Inglett, IBM Corporation
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*
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* PCI manipulation via device_nodes.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/pci-bridge.h>
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#include <asm/ppc-pci.h>
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#include <asm/firmware.h>
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/*
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* Traverse_func that inits the PCI fields of the device node.
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* NOTE: this *must* be done before read/write config to the device.
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*/
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void * __devinit update_dn_pci_info(struct device_node *dn, void *data)
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{
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struct pci_controller *phb = data;
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const int *type =
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of_get_property(dn, "ibm,pci-config-space-type", NULL);
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const u32 *regs;
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struct pci_dn *pdn;
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pdn = alloc_maybe_bootmem(sizeof(*pdn), GFP_KERNEL);
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if (pdn == NULL)
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return NULL;
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memset(pdn, 0, sizeof(*pdn));
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dn->data = pdn;
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pdn->node = dn;
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pdn->phb = phb;
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regs = of_get_property(dn, "reg", NULL);
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if (regs) {
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/* First register entry is addr (00BBSS00) */
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pdn->busno = (regs[0] >> 16) & 0xff;
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pdn->devfn = (regs[0] >> 8) & 0xff;
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}
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pdn->pci_ext_config_space = (type && *type == 1);
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return NULL;
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}
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/*
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* Traverse a device tree stopping each PCI device in the tree.
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* This is done depth first. As each node is processed, a "pre"
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* function is called and the children are processed recursively.
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*
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* The "pre" func returns a value. If non-zero is returned from
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* the "pre" func, the traversal stops and this value is returned.
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* This return value is useful when using traverse as a method of
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* finding a device.
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*
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* NOTE: we do not run the func for devices that do not appear to
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* be PCI except for the start node which we assume (this is good
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* because the start node is often a phb which may be missing PCI
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* properties).
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* We use the class-code as an indicator. If we run into
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* one of these nodes we also assume its siblings are non-pci for
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* performance.
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*/
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void *traverse_pci_devices(struct device_node *start, traverse_func pre,
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void *data)
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{
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struct device_node *dn, *nextdn;
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void *ret;
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/* We started with a phb, iterate all childs */
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for (dn = start->child; dn; dn = nextdn) {
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const u32 *classp;
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u32 class;
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nextdn = NULL;
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classp = of_get_property(dn, "class-code", NULL);
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class = classp ? *classp : 0;
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if (pre && ((ret = pre(dn, data)) != NULL))
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return ret;
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/* If we are a PCI bridge, go down */
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if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI ||
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(class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
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/* Depth first...do children */
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nextdn = dn->child;
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else if (dn->sibling)
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/* ok, try next sibling instead. */
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nextdn = dn->sibling;
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if (!nextdn) {
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/* Walk up to next valid sibling. */
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do {
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dn = dn->parent;
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if (dn == start)
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return NULL;
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} while (dn->sibling == NULL);
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nextdn = dn->sibling;
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}
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}
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return NULL;
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}
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/**
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* pci_devs_phb_init_dynamic - setup pci devices under this PHB
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* phb: pci-to-host bridge (top-level bridge connecting to cpu)
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*
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* This routine is called both during boot, (before the memory
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* subsystem is set up, before kmalloc is valid) and during the
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* dynamic lpar operation of adding a PHB to a running system.
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*/
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void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb)
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{
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struct device_node *dn = phb->dn;
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struct pci_dn *pdn;
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/* PHB nodes themselves must not match */
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update_dn_pci_info(dn, phb);
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pdn = dn->data;
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if (pdn) {
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pdn->devfn = pdn->busno = -1;
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pdn->phb = phb;
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}
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/* Update dn->phb ptrs for new phb and children devices */
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traverse_pci_devices(dn, update_dn_pci_info, phb);
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}
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/*
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* Traversal func that looks for a <busno,devfcn> value.
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* If found, the pci_dn is returned (thus terminating the traversal).
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*/
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static void *is_devfn_node(struct device_node *dn, void *data)
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{
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int busno = ((unsigned long)data >> 8) & 0xff;
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int devfn = ((unsigned long)data) & 0xff;
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struct pci_dn *pci = dn->data;
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if (pci && (devfn == pci->devfn) && (busno == pci->busno))
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return dn;
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return NULL;
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}
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/*
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* This is the "slow" path for looking up a device_node from a
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* pci_dev. It will hunt for the device under its parent's
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* phb and then update sysdata for a future fastpath.
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*
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* It may also do fixups on the actual device since this happens
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* on the first read/write.
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*
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* Note that it also must deal with devices that don't exist.
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* In this case it may probe for real hardware ("just in case")
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* and add a device_node to the device tree if necessary.
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*
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*/
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struct device_node *fetch_dev_dn(struct pci_dev *dev)
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{
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struct device_node *orig_dn = dev->sysdata;
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struct device_node *dn;
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unsigned long searchval = (dev->bus->number << 8) | dev->devfn;
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dn = traverse_pci_devices(orig_dn, is_devfn_node, (void *)searchval);
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if (dn)
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dev->sysdata = dn;
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return dn;
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}
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EXPORT_SYMBOL(fetch_dev_dn);
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/**
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* pci_devs_phb_init - Initialize phbs and pci devs under them.
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*
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* This routine walks over all phb's (pci-host bridges) on the
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* system, and sets up assorted pci-related structures
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* (including pci info in the device node structs) for each
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* pci device found underneath. This routine runs once,
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* early in the boot sequence.
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*/
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void __init pci_devs_phb_init(void)
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{
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struct pci_controller *phb, *tmp;
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/* This must be done first so the device nodes have valid pci info! */
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list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
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pci_devs_phb_init_dynamic(phb);
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}
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