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