/* * 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)) { 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; }