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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 00:20:36 +0200
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 00:20:36 +0200
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/acpi/pci_root.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'drivers/acpi/pci_root.c')
-rw-r--r--drivers/acpi/pci_root.c347
1 files changed, 347 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
new file mode 100644
index 000000000000..7e6b8e3b2ed4
--- /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 <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_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);
+