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394 lines
9.4 KiB
394 lines
9.4 KiB
/*
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* pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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 (at
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* 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/spinlock.h>
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#include <linux/pm.h>
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define _COMPONENT ACPI_PCI_COMPONENT
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ACPI_MODULE_NAME("pci_root");
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#define ACPI_PCI_ROOT_CLASS "pci_bridge"
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#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
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static int acpi_pci_root_add(struct acpi_device *device);
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static int acpi_pci_root_remove(struct acpi_device *device, int type);
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static int acpi_pci_root_start(struct acpi_device *device);
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static struct acpi_device_id root_device_ids[] = {
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{"PNP0A03", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, root_device_ids);
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static struct acpi_driver acpi_pci_root_driver = {
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.name = "pci_root",
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.class = ACPI_PCI_ROOT_CLASS,
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.ids = root_device_ids,
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.ops = {
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.add = acpi_pci_root_add,
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.remove = acpi_pci_root_remove,
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.start = acpi_pci_root_start,
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},
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};
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struct acpi_pci_root {
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struct list_head node;
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struct acpi_device * device;
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struct acpi_pci_id id;
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struct pci_bus *bus;
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};
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static LIST_HEAD(acpi_pci_roots);
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static struct acpi_pci_driver *sub_driver;
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int acpi_pci_register_driver(struct acpi_pci_driver *driver)
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{
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int n = 0;
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struct list_head *entry;
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struct acpi_pci_driver **pptr = &sub_driver;
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while (*pptr)
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pptr = &(*pptr)->next;
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*pptr = driver;
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if (!driver->add)
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return 0;
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list_for_each(entry, &acpi_pci_roots) {
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struct acpi_pci_root *root;
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root = list_entry(entry, struct acpi_pci_root, node);
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driver->add(root->device->handle);
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n++;
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}
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return n;
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}
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EXPORT_SYMBOL(acpi_pci_register_driver);
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void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
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{
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struct list_head *entry;
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struct acpi_pci_driver **pptr = &sub_driver;
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while (*pptr) {
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if (*pptr == driver)
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break;
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pptr = &(*pptr)->next;
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}
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BUG_ON(!*pptr);
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*pptr = (*pptr)->next;
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if (!driver->remove)
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return;
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list_for_each(entry, &acpi_pci_roots) {
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struct acpi_pci_root *root;
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root = list_entry(entry, struct acpi_pci_root, node);
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driver->remove(root->device->handle);
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}
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}
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EXPORT_SYMBOL(acpi_pci_unregister_driver);
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acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
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{
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struct acpi_pci_root *tmp;
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list_for_each_entry(tmp, &acpi_pci_roots, node) {
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if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
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return tmp->device->handle;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
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static acpi_status
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get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
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{
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int *busnr = data;
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struct acpi_resource_address64 address;
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if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
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resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
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resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
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return AE_OK;
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acpi_resource_to_address64(resource, &address);
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if ((address.address_length > 0) &&
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(address.resource_type == ACPI_BUS_NUMBER_RANGE))
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*busnr = address.minimum;
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return AE_OK;
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}
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static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
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{
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acpi_status status;
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*busnum = -1;
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status =
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acpi_walk_resources(handle, METHOD_NAME__CRS,
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get_root_bridge_busnr_callback, busnum);
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if (ACPI_FAILURE(status))
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return status;
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/* Check if we really get a bus number from _CRS */
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if (*busnum == -1)
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return AE_ERROR;
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return AE_OK;
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}
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static void acpi_pci_bridge_scan(struct acpi_device *device)
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{
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int status;
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struct acpi_device *child = NULL;
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if (device->flags.bus_address)
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if (device->parent && device->parent->ops.bind) {
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status = device->parent->ops.bind(device);
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if (!status) {
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list_for_each_entry(child, &device->children, node)
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acpi_pci_bridge_scan(child);
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}
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}
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}
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static int acpi_pci_root_add(struct acpi_device *device)
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{
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int result = 0;
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struct acpi_pci_root *root = NULL;
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struct acpi_pci_root *tmp;
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acpi_status status = AE_OK;
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unsigned long value = 0;
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acpi_handle handle = NULL;
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struct acpi_device *child;
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if (!device)
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return -EINVAL;
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root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
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if (!root)
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return -ENOMEM;
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INIT_LIST_HEAD(&root->node);
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root->device = device;
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strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
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acpi_driver_data(device) = root;
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device->ops.bind = acpi_pci_bind;
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/*
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* Segment
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* -------
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* Obtained via _SEG, if exists, otherwise assumed to be zero (0).
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*/
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status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
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&value);
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switch (status) {
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case AE_OK:
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root->id.segment = (u16) value;
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break;
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case AE_NOT_FOUND:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Assuming segment 0 (no _SEG)\n"));
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root->id.segment = 0;
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break;
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default:
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
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result = -ENODEV;
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goto end;
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}
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/*
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* Bus
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* ---
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* Obtained via _BBN, if exists, otherwise assumed to be zero (0).
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*/
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status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
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&value);
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switch (status) {
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case AE_OK:
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root->id.bus = (u16) value;
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break;
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case AE_NOT_FOUND:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
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root->id.bus = 0;
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break;
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default:
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
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result = -ENODEV;
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goto end;
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}
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/* Some systems have wrong _BBN */
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list_for_each_entry(tmp, &acpi_pci_roots, node) {
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if ((tmp->id.segment == root->id.segment)
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&& (tmp->id.bus == root->id.bus)) {
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int bus = 0;
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acpi_status status;
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printk(KERN_ERR PREFIX
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"Wrong _BBN value, reboot"
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" and use option 'pci=noacpi'\n");
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status = try_get_root_bridge_busnr(device->handle, &bus);
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if (ACPI_FAILURE(status))
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break;
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if (bus != root->id.bus) {
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printk(KERN_INFO PREFIX
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"PCI _CRS %d overrides _BBN 0\n", bus);
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root->id.bus = bus;
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}
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break;
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}
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}
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/*
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* Device & Function
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* -----------------
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* Obtained from _ADR (which has already been evaluated for us).
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*/
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root->id.device = device->pnp.bus_address >> 16;
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root->id.function = device->pnp.bus_address & 0xFFFF;
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/*
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* TBD: Need PCI interface for enumeration/configuration of roots.
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*/
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/* TBD: Locking */
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list_add_tail(&root->node, &acpi_pci_roots);
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printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
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acpi_device_name(device), acpi_device_bid(device),
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root->id.segment, root->id.bus);
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/*
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* Scan the Root Bridge
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* --------------------
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* Must do this prior to any attempt to bind the root device, as the
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* PCI namespace does not get created until this call is made (and
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* thus the root bridge's pci_dev does not exist).
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*/
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root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
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if (!root->bus) {
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printk(KERN_ERR PREFIX
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"Bus %04x:%02x not present in PCI namespace\n",
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root->id.segment, root->id.bus);
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result = -ENODEV;
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goto end;
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}
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/*
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* Attach ACPI-PCI Context
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* -----------------------
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* Thus binding the ACPI and PCI devices.
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*/
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result = acpi_pci_bind_root(device, &root->id, root->bus);
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if (result)
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goto end;
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/*
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* PCI Routing Table
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* -----------------
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* Evaluate and parse _PRT, if exists.
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*/
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status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
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if (ACPI_SUCCESS(status))
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result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
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root->id.bus);
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/*
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* Scan and bind all _ADR-Based Devices
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*/
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list_for_each_entry(child, &device->children, node)
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acpi_pci_bridge_scan(child);
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end:
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if (result) {
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if (!list_empty(&root->node))
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list_del(&root->node);
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kfree(root);
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}
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return result;
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}
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static int acpi_pci_root_start(struct acpi_device *device)
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{
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struct acpi_pci_root *root;
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list_for_each_entry(root, &acpi_pci_roots, node) {
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if (root->device == device) {
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pci_bus_add_devices(root->bus);
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return 0;
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}
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}
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return -ENODEV;
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}
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static int acpi_pci_root_remove(struct acpi_device *device, int type)
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{
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struct acpi_pci_root *root = NULL;
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if (!device || !acpi_driver_data(device))
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return -EINVAL;
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root = acpi_driver_data(device);
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kfree(root);
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return 0;
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}
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static int __init acpi_pci_root_init(void)
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{
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if (acpi_pci_disabled)
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return 0;
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/* DEBUG:
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acpi_dbg_layer = ACPI_PCI_COMPONENT;
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acpi_dbg_level = 0xFFFFFFFF;
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*/
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if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
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return -ENODEV;
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return 0;
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}
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subsys_initcall(acpi_pci_root_init);
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