From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/acpi/pci_root.c | 347 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 347 insertions(+) create mode 100644 drivers/acpi/pci_root.c (limited to 'drivers/acpi/pci_root.c') diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c new file mode 100644 index 00000000000..7e6b8e3b2ed --- /dev/null +++ b/drivers/acpi/pci_root.c @@ -0,0 +1,347 @@ +/* + * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) + * + * Copyright (C) 2001, 2002 Andy Grover + * Copyright (C) 2001, 2002 Paul Diefenbaugh + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#define _COMPONENT ACPI_PCI_COMPONENT +ACPI_MODULE_NAME ("pci_root") + +#define ACPI_PCI_ROOT_CLASS "pci_bridge" +#define ACPI_PCI_ROOT_HID "PNP0A03" +#define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver" +#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 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; + 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->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) + continue; + *pptr = (*pptr)->next; + break; + } + + 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->handle); + } +} +EXPORT_SYMBOL(acpi_pci_unregister_driver); + +static acpi_status +get_root_bridge_busnr_callback (struct acpi_resource *resource, void *data) +{ + int *busnr = (int *)data; + struct acpi_resource_address64 address; + + if (resource->id != ACPI_RSTYPE_ADDRESS16 && + resource->id != ACPI_RSTYPE_ADDRESS32 && + resource->id != ACPI_RSTYPE_ADDRESS64) + return AE_OK; + + acpi_resource_to_address64(resource, &address); + if ((address.address_length > 0) && + (address.resource_type == ACPI_BUS_NUMBER_RANGE)) + *busnr = address.min_address_range; + + 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 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; + + 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; + strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); + strcpy(acpi_device_class(device), 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; + 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; + } + + /* 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; + + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Wrong _BBN value, please reboot and using option 'pci=noacpi'\n")); + + status = try_get_root_bridge_busnr(root->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) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "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(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); +} + + +static int __init acpi_pci_root_init (void) +{ + ACPI_FUNCTION_TRACE("acpi_pci_root_init"); + + if (acpi_pci_disabled) + return_VALUE(0); + + /* DEBUG: + acpi_dbg_layer = ACPI_PCI_COMPONENT; + acpi_dbg_level = 0xFFFFFFFF; + */ + + if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) + return_VALUE(-ENODEV); + + return_VALUE(0); +} + +subsys_initcall(acpi_pci_root_init); + -- cgit v1.2.3