11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 51da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 101da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 111da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or (at 121da177e4SLinus Torvalds * your option) any later version. 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, but 151da177e4SLinus Torvalds * WITHOUT ANY WARRANTY; without even the implied warranty of 161da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 171da177e4SLinus Torvalds * General Public License for more details. 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License along 201da177e4SLinus Torvalds * with this program; if not, write to the Free Software Foundation, Inc., 211da177e4SLinus Torvalds * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 221da177e4SLinus Torvalds * 231da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 241da177e4SLinus Torvalds */ 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <linux/kernel.h> 271da177e4SLinus Torvalds #include <linux/module.h> 281da177e4SLinus Torvalds #include <linux/init.h> 291da177e4SLinus Torvalds #include <linux/types.h> 301da177e4SLinus Torvalds #include <linux/proc_fs.h> 311da177e4SLinus Torvalds #include <linux/spinlock.h> 321da177e4SLinus Torvalds #include <linux/pm.h> 331da177e4SLinus Torvalds #include <linux/pci.h> 341da177e4SLinus Torvalds #include <linux/acpi.h> 351da177e4SLinus Torvalds #include <acpi/acpi_bus.h> 361da177e4SLinus Torvalds #include <acpi/acpi_drivers.h> 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #define _COMPONENT ACPI_PCI_COMPONENT 401da177e4SLinus Torvalds ACPI_MODULE_NAME ("pci_root") 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds #define ACPI_PCI_ROOT_CLASS "pci_bridge" 431da177e4SLinus Torvalds #define ACPI_PCI_ROOT_HID "PNP0A03" 441da177e4SLinus Torvalds #define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver" 451da177e4SLinus Torvalds #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds static int acpi_pci_root_add (struct acpi_device *device); 481da177e4SLinus Torvalds static int acpi_pci_root_remove (struct acpi_device *device, int type); 49c431ada4SRajesh Shah static int acpi_pci_root_start (struct acpi_device *device); 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds static struct acpi_driver acpi_pci_root_driver = { 521da177e4SLinus Torvalds .name = ACPI_PCI_ROOT_DRIVER_NAME, 531da177e4SLinus Torvalds .class = ACPI_PCI_ROOT_CLASS, 541da177e4SLinus Torvalds .ids = ACPI_PCI_ROOT_HID, 551da177e4SLinus Torvalds .ops = { 561da177e4SLinus Torvalds .add = acpi_pci_root_add, 571da177e4SLinus Torvalds .remove = acpi_pci_root_remove, 58c431ada4SRajesh Shah .start = acpi_pci_root_start, 591da177e4SLinus Torvalds }, 601da177e4SLinus Torvalds }; 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds struct acpi_pci_root { 631da177e4SLinus Torvalds struct list_head node; 641da177e4SLinus Torvalds acpi_handle handle; 651da177e4SLinus Torvalds struct acpi_pci_id id; 661da177e4SLinus Torvalds struct pci_bus *bus; 671da177e4SLinus Torvalds }; 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds static LIST_HEAD(acpi_pci_roots); 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds static struct acpi_pci_driver *sub_driver; 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds int acpi_pci_register_driver(struct acpi_pci_driver *driver) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds int n = 0; 761da177e4SLinus Torvalds struct list_head *entry; 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds struct acpi_pci_driver **pptr = &sub_driver; 791da177e4SLinus Torvalds while (*pptr) 801da177e4SLinus Torvalds pptr = &(*pptr)->next; 811da177e4SLinus Torvalds *pptr = driver; 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds if (!driver->add) 841da177e4SLinus Torvalds return 0; 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds list_for_each(entry, &acpi_pci_roots) { 871da177e4SLinus Torvalds struct acpi_pci_root *root; 881da177e4SLinus Torvalds root = list_entry(entry, struct acpi_pci_root, node); 891da177e4SLinus Torvalds driver->add(root->handle); 901da177e4SLinus Torvalds n++; 911da177e4SLinus Torvalds } 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds return n; 941da177e4SLinus Torvalds } 951da177e4SLinus Torvalds EXPORT_SYMBOL(acpi_pci_register_driver); 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) 981da177e4SLinus Torvalds { 991da177e4SLinus Torvalds struct list_head *entry; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds struct acpi_pci_driver **pptr = &sub_driver; 1021da177e4SLinus Torvalds while (*pptr) { 1031da177e4SLinus Torvalds if (*pptr != driver) 1041da177e4SLinus Torvalds continue; 1051da177e4SLinus Torvalds *pptr = (*pptr)->next; 1061da177e4SLinus Torvalds break; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds if (!driver->remove) 1101da177e4SLinus Torvalds return; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds list_for_each(entry, &acpi_pci_roots) { 1131da177e4SLinus Torvalds struct acpi_pci_root *root; 1141da177e4SLinus Torvalds root = list_entry(entry, struct acpi_pci_root, node); 1151da177e4SLinus Torvalds driver->remove(root->handle); 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds EXPORT_SYMBOL(acpi_pci_unregister_driver); 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds static acpi_status 1211da177e4SLinus Torvalds get_root_bridge_busnr_callback (struct acpi_resource *resource, void *data) 1221da177e4SLinus Torvalds { 1231da177e4SLinus Torvalds int *busnr = (int *)data; 1241da177e4SLinus Torvalds struct acpi_resource_address64 address; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds if (resource->id != ACPI_RSTYPE_ADDRESS16 && 1271da177e4SLinus Torvalds resource->id != ACPI_RSTYPE_ADDRESS32 && 1281da177e4SLinus Torvalds resource->id != ACPI_RSTYPE_ADDRESS64) 1291da177e4SLinus Torvalds return AE_OK; 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds acpi_resource_to_address64(resource, &address); 1321da177e4SLinus Torvalds if ((address.address_length > 0) && 1331da177e4SLinus Torvalds (address.resource_type == ACPI_BUS_NUMBER_RANGE)) 1341da177e4SLinus Torvalds *busnr = address.min_address_range; 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds return AE_OK; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds static acpi_status 1401da177e4SLinus Torvalds try_get_root_bridge_busnr(acpi_handle handle, int *busnum) 1411da177e4SLinus Torvalds { 1421da177e4SLinus Torvalds acpi_status status; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds *busnum = -1; 1451da177e4SLinus Torvalds status = acpi_walk_resources(handle, METHOD_NAME__CRS, get_root_bridge_busnr_callback, busnum); 1461da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 1471da177e4SLinus Torvalds return status; 1481da177e4SLinus Torvalds /* Check if we really get a bus number from _CRS */ 1491da177e4SLinus Torvalds if (*busnum == -1) 1501da177e4SLinus Torvalds return AE_ERROR; 1511da177e4SLinus Torvalds return AE_OK; 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds static int 1551da177e4SLinus Torvalds acpi_pci_root_add ( 1561da177e4SLinus Torvalds struct acpi_device *device) 1571da177e4SLinus Torvalds { 1581da177e4SLinus Torvalds int result = 0; 1591da177e4SLinus Torvalds struct acpi_pci_root *root = NULL; 1601da177e4SLinus Torvalds struct acpi_pci_root *tmp; 1611da177e4SLinus Torvalds acpi_status status = AE_OK; 1621da177e4SLinus Torvalds unsigned long value = 0; 1631da177e4SLinus Torvalds acpi_handle handle = NULL; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds ACPI_FUNCTION_TRACE("acpi_pci_root_add"); 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds if (!device) 1681da177e4SLinus Torvalds return_VALUE(-EINVAL); 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); 1711da177e4SLinus Torvalds if (!root) 1721da177e4SLinus Torvalds return_VALUE(-ENOMEM); 1731da177e4SLinus Torvalds memset(root, 0, sizeof(struct acpi_pci_root)); 174c431ada4SRajesh Shah INIT_LIST_HEAD(&root->node); 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds root->handle = device->handle; 1771da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); 1781da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); 1791da177e4SLinus Torvalds acpi_driver_data(device) = root; 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds /* 1821da177e4SLinus Torvalds * TBD: Doesn't the bus driver automatically set this? 1831da177e4SLinus Torvalds */ 1841da177e4SLinus Torvalds device->ops.bind = acpi_pci_bind; 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds /* 1871da177e4SLinus Torvalds * Segment 1881da177e4SLinus Torvalds * ------- 1891da177e4SLinus Torvalds * Obtained via _SEG, if exists, otherwise assumed to be zero (0). 1901da177e4SLinus Torvalds */ 1911da177e4SLinus Torvalds status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL, 1921da177e4SLinus Torvalds &value); 1931da177e4SLinus Torvalds switch (status) { 1941da177e4SLinus Torvalds case AE_OK: 1951da177e4SLinus Torvalds root->id.segment = (u16) value; 1961da177e4SLinus Torvalds break; 1971da177e4SLinus Torvalds case AE_NOT_FOUND: 1981da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1991da177e4SLinus Torvalds "Assuming segment 0 (no _SEG)\n")); 2001da177e4SLinus Torvalds root->id.segment = 0; 2011da177e4SLinus Torvalds break; 2021da177e4SLinus Torvalds default: 2031da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SEG\n")); 2041da177e4SLinus Torvalds result = -ENODEV; 2051da177e4SLinus Torvalds goto end; 2061da177e4SLinus Torvalds } 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds /* 2091da177e4SLinus Torvalds * Bus 2101da177e4SLinus Torvalds * --- 2111da177e4SLinus Torvalds * Obtained via _BBN, if exists, otherwise assumed to be zero (0). 2121da177e4SLinus Torvalds */ 2131da177e4SLinus Torvalds status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL, 2141da177e4SLinus Torvalds &value); 2151da177e4SLinus Torvalds switch (status) { 2161da177e4SLinus Torvalds case AE_OK: 2171da177e4SLinus Torvalds root->id.bus = (u16) value; 2181da177e4SLinus Torvalds break; 2191da177e4SLinus Torvalds case AE_NOT_FOUND: 2201da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n")); 2211da177e4SLinus Torvalds root->id.bus = 0; 2221da177e4SLinus Torvalds break; 2231da177e4SLinus Torvalds default: 2241da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BBN\n")); 2251da177e4SLinus Torvalds result = -ENODEV; 2261da177e4SLinus Torvalds goto end; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds /* Some systems have wrong _BBN */ 2301da177e4SLinus Torvalds list_for_each_entry(tmp, &acpi_pci_roots, node) { 2311da177e4SLinus Torvalds if ((tmp->id.segment == root->id.segment) 2321da177e4SLinus Torvalds && (tmp->id.bus == root->id.bus)) { 2331da177e4SLinus Torvalds int bus = 0; 2341da177e4SLinus Torvalds acpi_status status; 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 2371da177e4SLinus Torvalds "Wrong _BBN value, please reboot and using option 'pci=noacpi'\n")); 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds status = try_get_root_bridge_busnr(root->handle, &bus); 2401da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 2411da177e4SLinus Torvalds break; 2421da177e4SLinus Torvalds if (bus != root->id.bus) { 2431da177e4SLinus Torvalds printk(KERN_INFO PREFIX "PCI _CRS %d overrides _BBN 0\n", bus); 2441da177e4SLinus Torvalds root->id.bus = bus; 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds break; 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds } 2491da177e4SLinus Torvalds /* 2501da177e4SLinus Torvalds * Device & Function 2511da177e4SLinus Torvalds * ----------------- 2521da177e4SLinus Torvalds * Obtained from _ADR (which has already been evaluated for us). 2531da177e4SLinus Torvalds */ 2541da177e4SLinus Torvalds root->id.device = device->pnp.bus_address >> 16; 2551da177e4SLinus Torvalds root->id.function = device->pnp.bus_address & 0xFFFF; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds /* 2581da177e4SLinus Torvalds * TBD: Need PCI interface for enumeration/configuration of roots. 2591da177e4SLinus Torvalds */ 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds /* TBD: Locking */ 2621da177e4SLinus Torvalds list_add_tail(&root->node, &acpi_pci_roots); 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n", 2651da177e4SLinus Torvalds acpi_device_name(device), acpi_device_bid(device), 2661da177e4SLinus Torvalds root->id.segment, root->id.bus); 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds /* 2691da177e4SLinus Torvalds * Scan the Root Bridge 2701da177e4SLinus Torvalds * -------------------- 2711da177e4SLinus Torvalds * Must do this prior to any attempt to bind the root device, as the 2721da177e4SLinus Torvalds * PCI namespace does not get created until this call is made (and 2731da177e4SLinus Torvalds * thus the root bridge's pci_dev does not exist). 2741da177e4SLinus Torvalds */ 2751da177e4SLinus Torvalds root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus); 2761da177e4SLinus Torvalds if (!root->bus) { 2771da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 2781da177e4SLinus Torvalds "Bus %04x:%02x not present in PCI namespace\n", 2791da177e4SLinus Torvalds root->id.segment, root->id.bus)); 2801da177e4SLinus Torvalds result = -ENODEV; 2811da177e4SLinus Torvalds goto end; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds /* 2851da177e4SLinus Torvalds * Attach ACPI-PCI Context 2861da177e4SLinus Torvalds * ----------------------- 2871da177e4SLinus Torvalds * Thus binding the ACPI and PCI devices. 2881da177e4SLinus Torvalds */ 2891da177e4SLinus Torvalds result = acpi_pci_bind_root(device, &root->id, root->bus); 2901da177e4SLinus Torvalds if (result) 2911da177e4SLinus Torvalds goto end; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds /* 2941da177e4SLinus Torvalds * PCI Routing Table 2951da177e4SLinus Torvalds * ----------------- 2961da177e4SLinus Torvalds * Evaluate and parse _PRT, if exists. 2971da177e4SLinus Torvalds */ 2981da177e4SLinus Torvalds status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle); 2991da177e4SLinus Torvalds if (ACPI_SUCCESS(status)) 3001da177e4SLinus Torvalds result = acpi_pci_irq_add_prt(root->handle, root->id.segment, 3011da177e4SLinus Torvalds root->id.bus); 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds end: 304c431ada4SRajesh Shah if (result) { 305c431ada4SRajesh Shah if (!list_empty(&root->node)) 306c431ada4SRajesh Shah list_del(&root->node); 3071da177e4SLinus Torvalds kfree(root); 308c431ada4SRajesh Shah } 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds return_VALUE(result); 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 313c431ada4SRajesh Shah static int 314c431ada4SRajesh Shah acpi_pci_root_start ( 315c431ada4SRajesh Shah struct acpi_device *device) 316c431ada4SRajesh Shah { 317c431ada4SRajesh Shah struct acpi_pci_root *root; 318c431ada4SRajesh Shah 319c431ada4SRajesh Shah ACPI_FUNCTION_TRACE("acpi_pci_root_start"); 320c431ada4SRajesh Shah 321c431ada4SRajesh Shah list_for_each_entry(root, &acpi_pci_roots, node) { 322c431ada4SRajesh Shah if (root->handle == device->handle) { 323c431ada4SRajesh Shah pci_bus_add_devices(root->bus); 324c431ada4SRajesh Shah return_VALUE(0); 325c431ada4SRajesh Shah } 326c431ada4SRajesh Shah } 327c431ada4SRajesh Shah return_VALUE(-ENODEV); 328c431ada4SRajesh Shah } 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds static int 3311da177e4SLinus Torvalds acpi_pci_root_remove ( 3321da177e4SLinus Torvalds struct acpi_device *device, 3331da177e4SLinus Torvalds int type) 3341da177e4SLinus Torvalds { 3351da177e4SLinus Torvalds struct acpi_pci_root *root = NULL; 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds ACPI_FUNCTION_TRACE("acpi_pci_root_remove"); 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds if (!device || !acpi_driver_data(device)) 3401da177e4SLinus Torvalds return_VALUE(-EINVAL); 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds root = (struct acpi_pci_root *) acpi_driver_data(device); 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds kfree(root); 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds return_VALUE(0); 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds static int __init acpi_pci_root_init (void) 3511da177e4SLinus Torvalds { 3521da177e4SLinus Torvalds ACPI_FUNCTION_TRACE("acpi_pci_root_init"); 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds if (acpi_pci_disabled) 3551da177e4SLinus Torvalds return_VALUE(0); 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds /* DEBUG: 3581da177e4SLinus Torvalds acpi_dbg_layer = ACPI_PCI_COMPONENT; 3591da177e4SLinus Torvalds acpi_dbg_level = 0xFFFFFFFF; 3601da177e4SLinus Torvalds */ 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) 3631da177e4SLinus Torvalds return_VALUE(-ENODEV); 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds return_VALUE(0); 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds subsys_initcall(acpi_pci_root_init); 3691da177e4SLinus Torvalds 370