/*
* pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/pci.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define _COMPONENT ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_bind")
struct acpi_pci_data {
struct acpi_pci_id id;
struct pci_bus *bus;
struct pci_dev *dev;
};
static void acpi_pci_data_handler(acpi_handle handle, u32 function,
void *context)
{
/* TBD: Anything we need to do here? */
return;
}
/**
* acpi_get_pci_id
* ------------------
* This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
* to resolve PCI information for ACPI-PCI devices defined in the namespace.
* This typically occurs when resolving PCI operation region information.
*/
acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_device *device = NULL;
struct acpi_pci_data *data = NULL;
if (!id)
return AE_BAD_PARAMETER;
result = acpi_bus_get_device(handle, &device);
if (result) {
printk(KERN_ERR PREFIX
"Invalid ACPI Bus context for device %s\n",
acpi_device_bid(device));
return AE_NOT_EXIST;
}
status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
if (ACPI_FAILURE(status) || !data) {
ACPI_EXCEPTION((AE_INFO, status,
"Invalid ACPI-PCI context for device %s",
acpi_device_bid(device)));
return status;
}
*id = data->id;
/*
id->segment = data->id.segment;
id->bus = data->id.bus;
id->device = data->id.device;
id->function = data->id.function;
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Device %s has PCI address %02x:%02x:%02x.%02x\n",
acpi_device_bid(device), id->segment, id->bus,
id->device, id->function));
return AE_OK;
}
EXPORT_SYMBOL(acpi_get_pci_id);
int acpi_pci_bind(struct acpi_device *device)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_pci_data *data = NULL;
struct acpi_pci_data *pdata = NULL;
char *pathname = NULL;
struct acpi_buffer buffer = { 0, NULL };
acpi_handle handle = NULL;
struct pci_dev *dev;
struct pci_bus *bus;
if (!device || !device->parent)
return -EINVAL;
pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
if (!pathname)
return -ENOMEM;
buffer.length = ACPI_PATHNAME_MAX;
buffer.pointer = pathname;
data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
if (!data) {
kfree(pathname);
return -ENOMEM;
}
acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
pathname));
/*
* Segment & Bus
* -------------
* These are obtained via the parent device's ACPI-PCI context.
*/
status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
(void **)&pdata);
if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
ACPI_EXCEPTION((AE_INFO, status,
"Invalid ACPI-PCI context for parent device %s",
acpi_device_bid(device->parent)));
result = -ENODEV;
goto end;
}
data->id.segment = pdata->id.segment;
data->id.bus = pdata->bus->number;
/*
* Device & Function
* -----------------
* These are simply obtained from the device's _ADR method. Note
* that a value of zero is valid.
*/
data->id.device = device->pnp.bus_address >> 16;
data->id.function = device->pnp.bus_address & 0xFFFF;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
data->id.segment, data->id.bus, data->id.device,
data->id.function));
/*
* TBD: Support slot devices (e.g. function=0xFFFF).
*/
/*
* Locate PCI Device
* -----------------
* Locate matching device in PCI namespace. If it doesn't exist
* this typically means that the device isn't currently inserted
* (e.g. docking station, port replicator, etc.).
* We cannot simply search the global pci device list, since
* PCI devices are added to the global pci list when the root
* bridge start ops are run, which may not have happened yet.
*/
bus = pci_find_bus(data->id.segment, data->id.bus);
if (bus) {
list_for_each_entry(dev, &bus->devices, bus_list) {
if (dev->devfn == PCI_DEVFN(data->id.device,
data->id.function)) {
data->dev = dev;
break;
}
}
}
if (!data->dev) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
data->id.segment, data->id.bus,
data->id.device, data->id.function));
result = -ENODEV;
goto end;
}
if (!data->dev->bus) {
printk(KERN_ERR PREFIX
"Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
data->id.segment, data->id.bus,
data->id.device, data->id.function);
result = -ENODEV;
goto end;
}
/*
* PCI Bridge?
* -----------
* If so, set the 'bus' field and install the 'bind' function to
* facilitate callbacks for all of its children.
*/
if (data->dev->subordinate) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Device %02x:%02x:%02x.%02x is a PCI bridge\n",
data->id.segment, data->id.bus,
data->id.device, data->id.function));
data->bus = data->dev->subordinate;
device->ops.bind = acpi_pci_bind;
device->ops.unbind = acpi_pci_unbind;
}
/*
* Attach ACPI-PCI Context
* -----------------------
* Thus binding the ACPI and PCI devices.
*/
status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Unable to attach ACPI-PCI context to device %s",
acpi_device_bid(device)));
result = -ENODEV;
goto end;
}
/*
* PCI Routing Table
* -----------------
* Evaluate and parse _PRT, if exists. This code is independent of
* PCI bridges (above) to allow parsing of _PRT objects within the
* scope of non-bridge devices. Note that _PRTs within the scope of
* a PCI bridge assume the bridge's subordinate bus number.
*
* TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
*/
status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
if (ACPI_SUCCESS(status)) {
if (data->bus) /* PCI-PCI bridge */
acpi_pci_irq_add_prt(device->handle, data->id.segment,
data->bus->number);
else /* non-bridge PCI device */
acpi_pci_irq_add_prt(device->handle, data->id.segment,
data->id.bus);
}
end:
kfree(pathname);
if (result)
kfree(data);
return result;
}
int acpi_pci_unbind(struct acpi_device *device)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_pci_data *data = NULL;
char *pathname = NULL;
struct acpi_buffer buffer = { 0, NULL };
if (!device || !device->parent)
return -EINVAL;
pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
if (!pathname)
return -ENOMEM;
buffer.length = ACPI_PATHNAME_MAX;
buffer.pointer = pathname;
acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
pathname));
kfree(pathname);
status =
acpi_get_data(device->handle, acpi_pci_data_handler,
(void **)&data);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Unable to get data from device %s",
acpi_device_bid(device)));
result = -ENODEV;
goto end;
}
status = acpi_detach_data(device->handle, acpi_pci_data_handler);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Unable to detach data from device %s",
acpi_device_bid(device)));
result = -ENODEV;
goto end;
}
if (data->dev->subordinate) {
acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
}
kfree(data);
end:
return result;
}
int
acpi_pci_bind_root(struct acpi_device *device,
struct acpi_pci_id *id, struct pci_bus *bus)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_pci_data *data = NULL;
char *pathname = NULL;
struct acpi_buffer buffer = { 0, NULL };
pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
if (!pathname)
return -ENOMEM;
buffer.length = ACPI_PATHNAME_MAX;
buffer.pointer = pathname;
if (!device || !id || !bus) {
kfree(pathname);
return -EINVAL;
}
data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
if (!data) {
kfree(pathname);
return -ENOMEM;
}
data->id = *id;
data->bus = bus;
device->ops.bind = acpi_pci_bind;
device->ops.unbind = acpi_pci_unbind;
acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
"%02x:%02x\n", pathname, id->segment, id->bus));
status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Unable to attach ACPI-PCI context to device %s",
pathname));
result = -ENODEV;
goto end;
}
end:
kfree(pathname);
if (result != 0)
kfree(data);
return result;
}
