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