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 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 <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);
+