/* * 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_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_device_id root_device_ids[] = { {"PNP0A03", 0}, {"", 0}, }; MODULE_DEVICE_TABLE(acpi, root_device_ids); static struct acpi_driver acpi_pci_root_driver = { .name = "pci_root", .class = ACPI_PCI_ROOT_CLASS, .ids = root_device_ids, .ops = { .add = acpi_pci_root_add, .remove = acpi_pci_root_remove, .start = acpi_pci_root_start, }, }; struct acpi_pci_root { struct list_head node; struct acpi_device * device; 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->device->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) break; pptr = &(*pptr)->next; } BUG_ON(!*pptr); *pptr = (*pptr)->next; 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->device->handle); } } EXPORT_SYMBOL(acpi_pci_unregister_driver); acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) { struct acpi_pci_root *tmp; list_for_each_entry(tmp, &acpi_pci_roots, node) { if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus)) return tmp->device->handle; } return NULL; } EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); static acpi_status get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) { int *busnr = data; struct acpi_resource_address64 address; if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) return AE_OK; acpi_resource_to_address64(resource, &address); if ((address.address_length > 0) && (address.resource_type == ACPI_BUS_NUMBER_RANGE)) *busnr = address.minimum; 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 void acpi_pci_bridge_scan(struct acpi_device *device) { int status; struct acpi_device *child = NULL; if (device->flags.bus_address) if (device->parent && device->parent->ops.bind) { status = device->parent->ops.bind(device); if (!status) { list_for_each_entry(child, &device->children, node) acpi_pci_bridge_scan(child); } } } 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; struct acpi_device *child; if (!device) return -EINVAL; root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); if (!root) return -ENOMEM; INIT_LIST_HEAD(&root->node); root->device = device; strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); acpi_driver_data(device) = root; device->ops.bind = acpi_pci_bind; /* * Segment * ------- * Obtained via _SEG, if exists, otherwise assumed to be zero (0). */ status = acpi_evaluate_integer(device->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_EXCEPTION((AE_INFO, status, "Evaluating _SEG")); result = -ENODEV; goto end; } /* * Bus * --- * Obtained via _BBN, if exists, otherwise assumed to be zero (0). */ status = acpi_evaluate_integer(device->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_EXCEPTION((AE_INFO, status, "Evaluating _BBN")); 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; printk(KERN_ERR PREFIX "Wrong _BBN value, reboot" " and use option 'pci=noacpi'\n"); status = try_get_root_bridge_busnr(device->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) { printk(KERN_ERR PREFIX "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(device->handle, METHOD_NAME__PRT, &handle); if (ACPI_SUCCESS(status)) result = acpi_pci_irq_add_prt(device->handle, root->id.segment, root->id.bus); /* * Scan and bind all _ADR-Based Devices */ list_for_each_entry(child, &device->children, node) acpi_pci_bridge_scan(child); end: if (result) { if (!list_empty(&root->node)) list_del(&root->node); kfree(root); } return result; } static int acpi_pci_root_start(struct acpi_device *device) { struct acpi_pci_root *root; list_for_each_entry(root, &acpi_pci_roots, node) { if (root->device == device) { pci_bus_add_devices(root->bus); return 0; } } return -ENODEV; } static int acpi_pci_root_remove(struct acpi_device *device, int type) { struct acpi_pci_root *root = NULL; if (!device || !acpi_driver_data(device)) return -EINVAL; root = acpi_driver_data(device); kfree(root); return 0; } static int __init acpi_pci_root_init(void) { if (acpi_pci_disabled) return 0; /* DEBUG: acpi_dbg_layer = ACPI_PCI_COMPONENT; acpi_dbg_level = 0xFFFFFFFF; */ if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) return -ENODEV; return 0; } subsys_initcall(acpi_pci_root_init);