/* * 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_bus.h" #include "acpi_drivers.h" #define _COMPONENT ACPI_PCI_COMPONENT ACPI_MODULE_NAME ("pci_root") extern struct pci_ops *pci_root_ops; #define PREFIX "ACPI: " static int acpi_pci_root_add (struct acpi_device *device); static int acpi_pci_root_remove (struct acpi_device *device, int type); 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, }, }; struct acpi_pci_root { struct list_head node; acpi_handle handle; acpi_pci_id id; struct pci_bus *bus; u64 mem_tra; u64 io_tra; }; struct list_head acpi_pci_roots; void acpi_pci_get_translations ( acpi_pci_id *id, u64 *mem_tra, u64 *io_tra) { struct list_head *node = NULL; struct acpi_pci_root *entry; /* TBD: Locking */ list_for_each(node, &acpi_pci_roots) { entry = list_entry(node, struct acpi_pci_root, node); if ((id->segment == entry->id.segment) && (id->bus == entry->id.bus)) { *mem_tra = entry->mem_tra; *io_tra = entry->io_tra; return; } } *mem_tra = 0; *io_tra = 0; } static u64 acpi_pci_root_bus_tra ( acpi_resource *resource, int type) { acpi_resource_address16 *address16; acpi_resource_address32 *address32; acpi_resource_address64 *address64; while (1) { switch (resource->id) { case ACPI_RSTYPE_END_TAG: return 0; case ACPI_RSTYPE_ADDRESS16: address16 = (acpi_resource_address16 *) &resource->data; if (type == address16->resource_type) { return address16->address_translation_offset; } break; case ACPI_RSTYPE_ADDRESS32: address32 = (acpi_resource_address32 *) &resource->data; if (type == address32->resource_type) { return address32->address_translation_offset; } break; case ACPI_RSTYPE_ADDRESS64: address64 = (acpi_resource_address64 *) &resource->data; if (type == address64->resource_type) { return address64->address_translation_offset; } break; } resource = ACPI_PTR_ADD (acpi_resource, resource, resource->length); } return 0; } static int acpi_pci_evaluate_crs ( struct acpi_pci_root *root) { acpi_status status; acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; ACPI_FUNCTION_TRACE("acpi_pci_evaluate_crs"); status = acpi_get_current_resources (root->handle, &buffer); if (ACPI_FAILURE(status)) return_VALUE(-ENODEV); root->io_tra = acpi_pci_root_bus_tra ((acpi_resource *) buffer.pointer, ACPI_IO_RANGE); root->mem_tra = acpi_pci_root_bus_tra ((acpi_resource *) buffer.pointer, ACPI_MEMORY_RANGE); acpi_os_free(buffer.pointer); return_VALUE(0); } static int acpi_pci_root_add ( struct acpi_device *device) { int result = 0; struct acpi_pci_root *root = NULL; 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)); root->handle = device->handle; sprintf(acpi_device_name(device), "%s", ACPI_PCI_ROOT_DEVICE_NAME); sprintf(acpi_device_class(device), "%s", 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; printk("_SEG exists! Unsupported. Abort.\n"); BUG(); 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; } /* * 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; /* * Evaluate _CRS to get root bridge resources * TBD: Need PCI interface for enumeration/configuration of roots. */ acpi_pci_evaluate_crs(root); /* TBD: Locking */ list_add_tail(&root->node, &acpi_pci_roots); printk(KERN_INFO PREFIX "%s [%s] (%02x:%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 = pcibios_scan_root(root->id.bus); if (!root->bus) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Bus %02x:%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) kfree(root); return_VALUE(result); } 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); } int __init acpi_pci_root_init (void) { ACPI_FUNCTION_TRACE("acpi_pci_root_init"); /* DEBUG: acpi_dbg_layer = ACPI_PCI_COMPONENT; acpi_dbg_level = 0xFFFFFFFF; */ INIT_LIST_HEAD(&acpi_pci_roots); if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) return_VALUE(-ENODEV); return_VALUE(0); } void __exit acpi_pci_root_exit (void) { ACPI_FUNCTION_TRACE("acpi_pci_root_exit"); acpi_bus_unregister_driver(&acpi_pci_root_driver); return_VOID; }