2 * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/proc_fs.h>
31 #include <linux/spinlock.h>
33 #include <linux/pci.h>
34 #include <linux/acpi.h>
35 #include <acpi/acpi_bus.h>
36 #include <acpi/acpi_drivers.h>
39 #define _COMPONENT ACPI_PCI_COMPONENT
40 ACPI_MODULE_NAME ("pci_root")
42 #define ACPI_PCI_ROOT_CLASS "pci_bridge"
43 #define ACPI_PCI_ROOT_HID "PNP0A03"
44 #define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver"
45 #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
47 extern struct pci_ops *pci_root_ops;
49 static int acpi_pci_root_add (struct acpi_device *device);
50 static int acpi_pci_root_remove (struct acpi_device *device, int type);
52 static struct acpi_driver acpi_pci_root_driver = {
53 .name = ACPI_PCI_ROOT_DRIVER_NAME,
54 .class = ACPI_PCI_ROOT_CLASS,
55 .ids = ACPI_PCI_ROOT_HID,
57 .add = acpi_pci_root_add,
58 .remove = acpi_pci_root_remove,
62 struct acpi_pci_root {
63 struct list_head node;
65 struct acpi_pci_id id;
71 struct list_head acpi_pci_roots;
75 acpi_pci_get_translations (
76 struct acpi_pci_id *id,
80 struct list_head *node = NULL;
81 struct acpi_pci_root *entry;
84 list_for_each(node, &acpi_pci_roots) {
85 entry = list_entry(node, struct acpi_pci_root, node);
86 if ((id->segment == entry->id.segment)
87 && (id->bus == entry->id.bus)) {
88 *mem_tra = entry->mem_tra;
89 *io_tra = entry->io_tra;
100 acpi_pci_root_bus_tra (
101 struct acpi_resource *resource,
104 struct acpi_resource_address16 *address16;
105 struct acpi_resource_address32 *address32;
106 struct acpi_resource_address64 *address64;
109 switch (resource->id) {
110 case ACPI_RSTYPE_END_TAG:
113 case ACPI_RSTYPE_ADDRESS16:
114 address16 = (struct acpi_resource_address16 *) &resource->data;
115 if (type == address16->resource_type) {
116 return address16->address_translation_offset;
120 case ACPI_RSTYPE_ADDRESS32:
121 address32 = (struct acpi_resource_address32 *) &resource->data;
122 if (type == address32->resource_type) {
123 return address32->address_translation_offset;
127 case ACPI_RSTYPE_ADDRESS64:
128 address64 = (struct acpi_resource_address64 *) &resource->data;
129 if (type == address64->resource_type) {
130 return address64->address_translation_offset;
134 resource = ACPI_PTR_ADD (struct acpi_resource,
135 resource, resource->length);
143 acpi_pci_evaluate_crs (
144 struct acpi_pci_root *root)
147 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
149 ACPI_FUNCTION_TRACE("acpi_pci_evaluate_crs");
151 status = acpi_get_current_resources (root->handle, &buffer);
152 if (ACPI_FAILURE(status))
153 return_VALUE(-ENODEV);
155 root->io_tra = acpi_pci_root_bus_tra ((struct acpi_resource *)
156 buffer.pointer, ACPI_IO_RANGE);
157 root->mem_tra = acpi_pci_root_bus_tra ((struct acpi_resource *)
158 buffer.pointer, ACPI_MEMORY_RANGE);
160 acpi_os_free(buffer.pointer);
167 struct acpi_device *device)
170 struct acpi_pci_root *root = NULL;
171 acpi_status status = AE_OK;
172 unsigned long value = 0;
173 acpi_handle handle = NULL;
175 ACPI_FUNCTION_TRACE("acpi_pci_root_add");
178 return_VALUE(-EINVAL);
180 root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
182 return_VALUE(-ENOMEM);
183 memset(root, 0, sizeof(struct acpi_pci_root));
185 root->handle = device->handle;
186 sprintf(acpi_device_name(device), "%s", ACPI_PCI_ROOT_DEVICE_NAME);
187 sprintf(acpi_device_class(device), "%s", ACPI_PCI_ROOT_CLASS);
188 acpi_driver_data(device) = root;
191 * TBD: Doesn't the bus driver automatically set this?
193 device->ops.bind = acpi_pci_bind;
198 * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
200 status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL,
204 root->id.segment = (u16) value;
205 printk("_SEG exists! Unsupported. Abort.\n");
209 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
210 "Assuming segment 0 (no _SEG)\n"));
211 root->id.segment = 0;
214 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SEG\n"));
222 * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
224 status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL,
228 root->id.bus = (u16) value;
231 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
235 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BBN\n"));
243 * Obtained from _ADR (which has already been evaluated for us).
245 root->id.device = device->pnp.bus_address >> 16;
246 root->id.function = device->pnp.bus_address & 0xFFFF;
249 * Evaluate _CRS to get root bridge resources
250 * TBD: Need PCI interface for enumeration/configuration of roots.
252 acpi_pci_evaluate_crs(root);
255 list_add_tail(&root->node, &acpi_pci_roots);
257 printk(KERN_INFO PREFIX "%s [%s] (%02x:%02x)\n",
258 acpi_device_name(device), acpi_device_bid(device),
259 root->id.segment, root->id.bus);
262 * Scan the Root Bridge
263 * --------------------
264 * Must do this prior to any attempt to bind the root device, as the
265 * PCI namespace does not get created until this call is made (and
266 * thus the root bridge's pci_dev does not exist).
268 root->bus = pcibios_scan_root(root->id.bus);
270 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
271 "Bus %02x:%02x not present in PCI namespace\n",
272 root->id.segment, root->id.bus));
278 * Attach ACPI-PCI Context
279 * -----------------------
280 * Thus binding the ACPI and PCI devices.
282 result = acpi_pci_bind_root(device, &root->id, root->bus);
289 * Evaluate and parse _PRT, if exists.
291 status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle);
292 if (ACPI_SUCCESS(status))
293 result = acpi_pci_irq_add_prt(root->handle, root->id.segment,
300 return_VALUE(result);
305 acpi_pci_root_remove (
306 struct acpi_device *device,
309 struct acpi_pci_root *root = NULL;
311 ACPI_FUNCTION_TRACE("acpi_pci_root_remove");
313 if (!device || !acpi_driver_data(device))
314 return_VALUE(-EINVAL);
316 root = (struct acpi_pci_root *) acpi_driver_data(device);
324 static int __init acpi_pci_root_init (void)
326 ACPI_FUNCTION_TRACE("acpi_pci_root_init");
332 acpi_dbg_layer = ACPI_PCI_COMPONENT;
333 acpi_dbg_level = 0xFFFFFFFF;
336 INIT_LIST_HEAD(&acpi_pci_roots);
338 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
339 return_VALUE(-ENODEV);
344 subsys_initcall(acpi_pci_root_init);