diff options
Diffstat (limited to 'drivers/acpi/pci_root.c')
| -rw-r--r-- | drivers/acpi/pci_root.c | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c new file mode 100644 index 0000000..642554b --- /dev/null +++ b/drivers/acpi/pci_root.c @@ -0,0 +1,388 @@ +/* + * 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 __devinit 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 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); + device->driver_data = 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; + + if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) + return -ENODEV; + + return 0; +} + +subsys_initcall(acpi_pci_root_init); |
