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/*
* PCI HotPlug Utility functions
*
* Copyright (c) 1995,2001 Compaq Computer Corporation
* Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (c) 2001 IBM Corp.
*
* All rights reserved.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to <greg@kroah.com>
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include "pci_hotplug.h"
#if !defined(CONFIG_HOTPLUG_PCI_MODULE)
#define MY_NAME "pci_hotplug"
#else
#define MY_NAME THIS_MODULE->name
#endif
#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: "__FUNCTION__": " fmt , MY_NAME , ## arg); } while (0)
#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
/* local variables */
static int debug;
static int build_dev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, struct pci_dev **pci_dev)
{
struct pci_dev *my_dev;
struct pci_bus *my_bus;
/* Some validity checks. */
if ((function > 7) ||
(slot > 31) ||
(pci_dev == NULL) ||
(ops == NULL))
return -ENODEV;
my_dev = kmalloc (sizeof (struct pci_dev), GFP_KERNEL);
if (!my_dev)
return -ENOMEM;
my_bus = kmalloc (sizeof (struct pci_bus), GFP_KERNEL);
if (!my_bus) {
kfree (my_dev);
return -ENOMEM;
}
memset(my_dev, 0, sizeof(struct pci_dev));
memset(my_bus, 0, sizeof(struct pci_bus));
my_bus->number = bus;
my_bus->ops = ops;
my_dev->devfn = PCI_DEVFN(slot, function);
my_dev->bus = my_bus;
*pci_dev = my_dev;
return 0;
}
/**
* pci_read_config_byte_nodev - read a byte from a pci device
* @ops: pointer to a &struct pci_ops that will be used to read from the pci device
* @bus: the bus of the pci device to read from
* @slot: the pci slot number of the pci device to read from
* @function: the function of the pci device to read from
* @where: the location on the pci address space to read from
* @value: pointer to where to place the data read
*
* Like pci_read_config_byte() but works for pci devices that do not have a
* pci_dev structure set up yet.
* Returns 0 on success.
*/
int pci_read_config_byte_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u8 *value)
{
struct pci_dev *dev = NULL;
int result;
dbg("%p, %d, %d, %d, %d, %p\n", ops, bus, slot, function, where, value);
dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
if (dev) {
dbg("using native pci_dev\n");
return pci_read_config_byte (dev, where, value);
}
result = build_dev (ops, bus, slot, function, &dev);
if (result)
return result;
result = pci_read_config_byte(dev, where, value);
kfree (dev->bus);
kfree (dev);
return result;
}
/**
* pci_read_config_word_nodev - read a word from a pci device
* @ops: pointer to a &struct pci_ops that will be used to read from the pci device
* @bus: the bus of the pci device to read from
* @slot: the pci slot number of the pci device to read from
* @function: the function of the pci device to read from
* @where: the location on the pci address space to read from
* @value: pointer to where to place the data read
*
* Like pci_read_config_word() but works for pci devices that do not have a
* pci_dev structure set up yet.
* Returns 0 on success.
*/
int pci_read_config_word_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u16 *value)
{
struct pci_dev *dev = NULL;
int result;
dbg("%p, %d, %d, %d, %d, %p\n", ops, bus, slot, function, where, value);
dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
if (dev) {
dbg("using native pci_dev\n");
return pci_read_config_word (dev, where, value);
}
result = build_dev (ops, bus, slot, function, &dev);
if (result)
return result;
result = pci_read_config_word(dev, where, value);
kfree (dev->bus);
kfree (dev);
return result;
}
/**
* pci_read_config_dword_nodev - read a dword from a pci device
* @ops: pointer to a &struct pci_ops that will be used to read from the pci
* device
* @bus: the bus of the pci device to read from
* @slot: the pci slot number of the pci device to read from
* @function: the function of the pci device to read from
* @where: the location on the pci address space to read from
* @value: pointer to where to place the data read
*
* Like pci_read_config_dword() but works for pci devices that do not have a
* pci_dev structure set up yet.
* Returns 0 on success.
*/
int pci_read_config_dword_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u32 *value)
{
struct pci_dev *dev = NULL;
int result;
dbg("%p, %d, %d, %d, %d, %p\n", ops, bus, slot, function, where, value);
dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
if (dev) {
dbg("using native pci_dev\n");
return pci_read_config_dword (dev, where, value);
}
result = build_dev (ops, bus, slot, function, &dev);
if (result)
return result;
result = pci_read_config_dword(dev, where, value);
kfree (dev->bus);
kfree (dev);
return result;
}
/**
* pci_write_config_byte_nodev - write a byte to a pci device
* @ops: pointer to a &struct pci_ops that will be used to write to the pci
* device
* @bus: the bus of the pci device to write to
* @slot: the pci slot number of the pci device to write to
* @function: the function of the pci device to write to
* @where: the location on the pci address space to write to
* @value: the value to write to the pci device
*
* Like pci_write_config_byte() but works for pci devices that do not have a
* pci_dev structure set up yet.
* Returns 0 on success.
*/
int pci_write_config_byte_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u8 value)
{
struct pci_dev *dev = NULL;
int result;
dbg("%p, %d, %d, %d, %d, %d\n", ops, bus, slot, function, where, value);
dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
if (dev) {
dbg("using native pci_dev\n");
return pci_write_config_byte (dev, where, value);
}
result = build_dev (ops, bus, slot, function, &dev);
if (result)
return result;
result = pci_write_config_byte(dev, where, value);
kfree (dev->bus);
kfree (dev);
return result;
}
/**
* pci_write_config_word_nodev - write a word to a pci device
* @ops: pointer to a &struct pci_ops that will be used to write to the pci
* device
* @bus: the bus of the pci device to write to
* @slot: the pci slot number of the pci device to write to
* @function: the function of the pci device to write to
* @where: the location on the pci address space to write to
* @value: the value to write to the pci device
*
* Like pci_write_config_word() but works for pci devices that do not have a
* pci_dev structure set up yet.
* Returns 0 on success.
*/
int pci_write_config_word_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u16 value)
{
struct pci_dev *dev = NULL;
int result;
dbg("%p, %d, %d, %d, %d, %d\n", ops, bus, slot, function, where, value);
dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
if (dev) {
dbg("using native pci_dev\n");
return pci_write_config_word (dev, where, value);
}
result = build_dev (ops, bus, slot, function, &dev);
if (result)
return result;
result = pci_write_config_word(dev, where, value);
kfree (dev->bus);
kfree (dev);
return result;
}
/**
* pci_write_config_dword_nodev - write a dword to a pci device
* @ops: pointer to a &struct pci_ops that will be used to write to the pci
* device
* @bus: the bus of the pci device to write to
* @slot: the pci slot number of the pci device to write to
* @function: the function of the pci device to write to
* @where: the location on the pci address space to write to
* @value: the value to write to the pci device
*
* Like pci_write_config_dword() but works for pci devices that do not have a
* pci_dev structure set up yet.
* Returns 0 on success.
*/
int pci_write_config_dword_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u32 value)
{
struct pci_dev *dev = NULL;
int result;
dbg("%p, %d, %d, %d, %d, %d\n", ops, bus, slot, function, where, value);
dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
if (dev) {
dbg("using native pci_dev\n");
return pci_write_config_dword (dev, where, value);
}
result = build_dev (ops, bus, slot, function, &dev);
if (result)
return result;
result = pci_write_config_dword(dev, where, value);
kfree (dev->bus);
kfree (dev);
return result;
}
/*
* This is code that scans the pci buses.
* Every bus and every function is presented to a custom
* function that can act upon it.
*/
static int pci_visit_bus (struct pci_visit * fn, struct pci_bus_wrapped *wrapped_bus, struct pci_dev_wrapped *wrapped_parent)
{
struct list_head *ln;
struct pci_dev *dev;
struct pci_dev_wrapped wrapped_dev;
int result = 0;
dbg("scanning bus %02x\n", wrapped_bus->bus->number);
if (fn->pre_visit_pci_bus) {
result = fn->pre_visit_pci_bus(wrapped_bus, wrapped_parent);
if (result)
return result;
}
ln = wrapped_bus->bus->devices.next;
while (ln != &wrapped_bus->bus->devices) {
dev = pci_dev_b(ln);
ln = ln->next;
memset(&wrapped_dev, 0, sizeof(struct pci_dev_wrapped));
wrapped_dev.dev = dev;
result = pci_visit_dev(fn, &wrapped_dev, wrapped_bus);
if (result)
return result;
}
if (fn->post_visit_pci_bus)
result = fn->post_visit_pci_bus(wrapped_bus, wrapped_parent);
return result;
}
static int pci_visit_bridge (struct pci_visit * fn, struct pci_dev_wrapped *wrapped_dev, struct pci_bus_wrapped *wrapped_parent)
{
struct pci_bus *bus = wrapped_dev->dev->subordinate;
struct pci_bus_wrapped wrapped_bus;
int result;
memset(&wrapped_bus, 0, sizeof(struct pci_bus_wrapped));
wrapped_bus.bus = bus;
dbg("scanning bridge %02x, %02x\n", wrapped_dev->dev->devfn >> 3,
wrapped_dev->dev->devfn & 0x7);
if (fn->visit_pci_dev) {
result = fn->visit_pci_dev(wrapped_dev, wrapped_parent);
if (result)
return result;
}
result = pci_visit_bus(fn, &wrapped_bus, wrapped_dev);
return result;
}
int pci_visit_dev (struct pci_visit *fn, struct pci_dev_wrapped *wrapped_dev, struct pci_bus_wrapped *wrapped_parent)
{
struct pci_dev* dev = wrapped_dev ? wrapped_dev->dev : NULL;
int result = 0;
if (!dev)
return 0;
if (fn->pre_visit_pci_dev) {
result = fn->pre_visit_pci_dev(wrapped_dev, wrapped_parent);
if (result)
return result;
}
switch (dev->class >> 8) {
case PCI_CLASS_BRIDGE_PCI:
result = pci_visit_bridge(fn, wrapped_dev,
wrapped_parent);
if (result)
return result;
break;
default:
dbg("scanning device %02x, %02x\n",
PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
if (fn->visit_pci_dev) {
result = fn->visit_pci_dev (wrapped_dev,
wrapped_parent);
if (result)
return result;
}
}
if (fn->post_visit_pci_dev)
result = fn->post_visit_pci_dev(wrapped_dev, wrapped_parent);
return result;
}
EXPORT_SYMBOL(pci_visit_dev);
EXPORT_SYMBOL(pci_read_config_byte_nodev);
EXPORT_SYMBOL(pci_read_config_word_nodev);
EXPORT_SYMBOL(pci_read_config_dword_nodev);
EXPORT_SYMBOL(pci_write_config_byte_nodev);
EXPORT_SYMBOL(pci_write_config_word_nodev);
EXPORT_SYMBOL(pci_write_config_dword_nodev);
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