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linux/drivers/acpi/pci_root.c

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/*
* pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
*
* 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_root")
#define ACPI_PCI_ROOT_CLASS "pci_bridge"
#define ACPI_PCI_ROOT_HID "PNP0A03"
#define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver"
#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
static int acpi_pci_root_add(struct acpi_device *device);
static int acpi_pci_root_remove(struct acpi_device *device, int type);
static int acpi_pci_root_start(struct acpi_device *device);
static struct acpi_driver acpi_pci_root_driver = {
.name = ACPI_PCI_ROOT_DRIVER_NAME,
.class = ACPI_PCI_ROOT_CLASS,
.ids = ACPI_PCI_ROOT_HID,
.ops = {
.add = acpi_pci_root_add,
.remove = acpi_pci_root_remove,
.start = acpi_pci_root_start,
},
};
struct acpi_pci_root {
struct list_head node;
acpi_handle handle;
struct acpi_pci_id id;
struct pci_bus *bus;
};
static LIST_HEAD(acpi_pci_roots);
static struct acpi_pci_driver *sub_driver;
int acpi_pci_register_driver(struct acpi_pci_driver *driver)
{
int n = 0;
struct list_head *entry;
struct acpi_pci_driver **pptr = &sub_driver;
while (*pptr)
pptr = &(*pptr)->next;
*pptr = driver;
if (!driver->add)
return 0;
list_for_each(entry, &acpi_pci_roots) {
struct acpi_pci_root *root;
root = list_entry(entry, struct acpi_pci_root, node);
driver->add(root->handle);
n++;
}
return n;
}
EXPORT_SYMBOL(acpi_pci_register_driver);
void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
{
struct list_head *entry;
struct acpi_pci_driver **pptr = &sub_driver;
while (*pptr) {
if (*pptr != driver)
continue;
*pptr = (*pptr)->next;
break;
}
if (!driver->remove)
return;
list_for_each(entry, &acpi_pci_roots) {
struct acpi_pci_root *root;
root = list_entry(entry, struct acpi_pci_root, node);
driver->remove(root->handle);
}
}
EXPORT_SYMBOL(acpi_pci_unregister_driver);
static acpi_status
get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
{
int *busnr = (int *)data;
struct acpi_resource_address64 address;
if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
resource->id != ACPI_RSTYPE_ADDRESS32 &&
resource->id != ACPI_RSTYPE_ADDRESS64)
return AE_OK;
acpi_resource_to_address64(resource, &address);
if ((address.address_length > 0) &&
(address.resource_type == ACPI_BUS_NUMBER_RANGE))
*busnr = address.min_address_range;
return AE_OK;
}
static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
{
acpi_status status;
*busnum = -1;
status =
acpi_walk_resources(handle, METHOD_NAME__CRS,
get_root_bridge_busnr_callback, busnum);
if (ACPI_FAILURE(status))
return status;
/* Check if we really get a bus number from _CRS */
if (*busnum == -1)
return AE_ERROR;
return AE_OK;
}
static int acpi_pci_root_add(struct acpi_device *device)
{
int result = 0;
struct acpi_pci_root *root = NULL;
struct acpi_pci_root *tmp;
acpi_status status = AE_OK;
unsigned long value = 0;
acpi_handle handle = NULL;
ACPI_FUNCTION_TRACE("acpi_pci_root_add");
if (!device)
return_VALUE(-EINVAL);
root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
if (!root)
return_VALUE(-ENOMEM);
memset(root, 0, sizeof(struct acpi_pci_root));
INIT_LIST_HEAD(&root->node);
root->handle = device->handle;
strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
acpi_driver_data(device) = root;
/*
* TBD: Doesn't the bus driver automatically set this?
*/
device->ops.bind = acpi_pci_bind;
/*
* Segment
* -------
* Obtained via _SEG, if exists, otherwise assumed to be zero (0).
*/
status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL,
&value);
switch (status) {
case AE_OK:
root->id.segment = (u16) value;
break;
case AE_NOT_FOUND:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Assuming segment 0 (no _SEG)\n"));
root->id.segment = 0;
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SEG\n"));
result = -ENODEV;
goto end;
}
/*
* Bus
* ---
* Obtained via _BBN, if exists, otherwise assumed to be zero (0).
*/
status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL,
&value);
switch (status) {
case AE_OK:
root->id.bus = (u16) value;
break;
case AE_NOT_FOUND:
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
root->id.bus = 0;
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BBN\n"));
result = -ENODEV;
goto end;
}
/* Some systems have wrong _BBN */
list_for_each_entry(tmp, &acpi_pci_roots, node) {
if ((tmp->id.segment == root->id.segment)
&& (tmp->id.bus == root->id.bus)) {
int bus = 0;
acpi_status status;
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Wrong _BBN value, please reboot and using option 'pci=noacpi'\n"));
status = try_get_root_bridge_busnr(root->handle, &bus);
if (ACPI_FAILURE(status))
break;
if (bus != root->id.bus) {
printk(KERN_INFO PREFIX
"PCI _CRS %d overrides _BBN 0\n", bus);
root->id.bus = bus;
}
break;
}
}
/*
* Device & Function
* -----------------
* Obtained from _ADR (which has already been evaluated for us).
*/
root->id.device = device->pnp.bus_address >> 16;
root->id.function = device->pnp.bus_address & 0xFFFF;
/*
* TBD: Need PCI interface for enumeration/configuration of roots.
*/
/* TBD: Locking */
list_add_tail(&root->node, &acpi_pci_roots);
printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
acpi_device_name(device), acpi_device_bid(device),
root->id.segment, root->id.bus);
/*
* Scan the Root Bridge
* --------------------
* Must do this prior to any attempt to bind the root device, as the
* PCI namespace does not get created until this call is made (and
* thus the root bridge's pci_dev does not exist).
*/
root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
if (!root->bus) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Bus %04x:%02x not present in PCI namespace\n",
root->id.segment, root->id.bus));
result = -ENODEV;
goto end;
}
/*
* Attach ACPI-PCI Context
* -----------------------
* Thus binding the ACPI and PCI devices.
*/
result = acpi_pci_bind_root(device, &root->id, root->bus);
if (result)
goto end;
/*
* PCI Routing Table
* -----------------
* Evaluate and parse _PRT, if exists.
*/
status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle);
if (ACPI_SUCCESS(status))
result = acpi_pci_irq_add_prt(root->handle, root->id.segment,
root->id.bus);
end:
if (result) {
if (!list_empty(&root->node))
list_del(&root->node);
kfree(root);
}
return_VALUE(result);
}
static int acpi_pci_root_start(struct acpi_device *device)
{
struct acpi_pci_root *root;
ACPI_FUNCTION_TRACE("acpi_pci_root_start");
list_for_each_entry(root, &acpi_pci_roots, node) {
if (root->handle == device->handle) {
pci_bus_add_devices(root->bus);
return_VALUE(0);
}
}
return_VALUE(-ENODEV);
}
static int acpi_pci_root_remove(struct acpi_device *device, int type)
{
struct acpi_pci_root *root = NULL;
ACPI_FUNCTION_TRACE("acpi_pci_root_remove");
if (!device || !acpi_driver_data(device))
return_VALUE(-EINVAL);
root = (struct acpi_pci_root *)acpi_driver_data(device);
kfree(root);
return_VALUE(0);
}
static int __init acpi_pci_root_init(void)
{
ACPI_FUNCTION_TRACE("acpi_pci_root_init");
if (acpi_pci_disabled)
return_VALUE(0);
/* DEBUG:
acpi_dbg_layer = ACPI_PCI_COMPONENT;
acpi_dbg_level = 0xFFFFFFFF;
*/
if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
return_VALUE(-ENODEV);
return_VALUE(0);
}
subsys_initcall(acpi_pci_root_init);
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