[ACPI] Bind PCI devices with ACPI devices
Implement the framework for binding physical devices
with ACPI devices. A physical bus like PCI bus
should create a 'acpi_bus_type', with:
.find_device:
For device which has parent such as normal PCI devices.
.find_bridge:
It's for special devices, such as PCI root bridge
or IDE controller. Such devices generally haven't a
parent or ->bus. We use the special method
to get an ACPI handle.
Uses new field in struct device: firmware_data
http://bugzilla.kernel.org/show_bug.cgi?id=4277
Signed-off-by: David Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
new file mode 100644
index 0000000..b6d2045
--- /dev/null
+++ b/drivers/acpi/glue.c
@@ -0,0 +1,362 @@
+/*
+ * Link physical devices with ACPI devices support
+ *
+ * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
+ * Copyright (c) 2005 Intel Corp.
+ *
+ * This file is released under the GPLv2.
+ */
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/rwsem.h>
+#include <linux/acpi.h>
+
+#define ACPI_GLUE_DEBUG 0
+#if ACPI_GLUE_DEBUG
+#define DBG(x...) printk(PREFIX x)
+#else
+#define DBG(x...)
+#endif
+static LIST_HEAD(bus_type_list);
+static DECLARE_RWSEM(bus_type_sem);
+
+int register_acpi_bus_type(struct acpi_bus_type *type)
+{
+ if (acpi_disabled)
+ return -ENODEV;
+ if (type && type->bus && type->find_device) {
+ down_write(&bus_type_sem);
+ list_add_tail(&type->list, &bus_type_list);
+ up_write(&bus_type_sem);
+ DBG("ACPI bus type %s registered\n", type->bus->name);
+ return 0;
+ }
+ return -ENODEV;
+}
+
+EXPORT_SYMBOL(register_acpi_bus_type);
+
+int unregister_acpi_bus_type(struct acpi_bus_type *type)
+{
+ if (acpi_disabled)
+ return 0;
+ if (type) {
+ down_write(&bus_type_sem);
+ list_del_init(&type->list);
+ up_write(&bus_type_sem);
+ DBG("ACPI bus type %s unregistered\n", type->bus->name);
+ return 0;
+ }
+ return -ENODEV;
+}
+
+EXPORT_SYMBOL(unregister_acpi_bus_type);
+
+static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
+{
+ struct acpi_bus_type *tmp, *ret = NULL;
+
+ down_read(&bus_type_sem);
+ list_for_each_entry(tmp, &bus_type_list, list) {
+ if (tmp->bus == type) {
+ ret = tmp;
+ break;
+ }
+ }
+ up_read(&bus_type_sem);
+ return ret;
+}
+
+static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
+{
+ struct acpi_bus_type *tmp;
+ int ret = -ENODEV;
+
+ down_read(&bus_type_sem);
+ list_for_each_entry(tmp, &bus_type_list, list) {
+ if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
+ ret = 0;
+ break;
+ }
+ }
+ up_read(&bus_type_sem);
+ return ret;
+}
+
+/* Get PCI root bridge's handle from its segment and bus number */
+struct acpi_find_pci_root {
+ unsigned int seg;
+ unsigned int bus;
+ acpi_handle handle;
+};
+
+static acpi_status
+do_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 int get_root_bridge_busnr(acpi_handle handle)
+{
+ acpi_status status;
+ int bus, bbn;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+
+ acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+
+ status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
+ (unsigned long *)&bbn);
+ if (status == AE_NOT_FOUND) {
+ /* Assume bus = 0 */
+ printk(KERN_INFO PREFIX
+ "Assume root bridge [%s] bus is 0\n",
+ (char *)buffer.pointer);
+ status = AE_OK;
+ bbn = 0;
+ }
+ if (ACPI_FAILURE(status)) {
+ bbn = -ENODEV;
+ goto exit;
+ }
+ if (bbn > 0)
+ goto exit;
+
+ /* _BBN in some systems return 0 for all root bridges */
+ bus = -1;
+ status = acpi_walk_resources(handle, METHOD_NAME__CRS,
+ do_root_bridge_busnr_callback, &bus);
+ /* If _CRS failed, we just use _BBN */
+ if (ACPI_FAILURE(status) || (bus == -1))
+ goto exit;
+ /* We select _CRS */
+ if (bbn != bus) {
+ printk(KERN_INFO PREFIX
+ "_BBN and _CRS returns different value for %s. Select _CRS\n",
+ (char *)buffer.pointer);
+ bbn = bus;
+ }
+ exit:
+ acpi_os_free(buffer.pointer);
+ return bbn;
+}
+
+static acpi_status
+find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+ struct acpi_find_pci_root *find = (struct acpi_find_pci_root *)context;
+ unsigned long seg, bus;
+ acpi_status status;
+ int tmp;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+
+ acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+
+ status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg);
+ if (status == AE_NOT_FOUND) {
+ /* Assume seg = 0 */
+ printk(KERN_INFO PREFIX
+ "Assume root bridge [%s] segment is 0\n",
+ (char *)buffer.pointer);
+ status = AE_OK;
+ seg = 0;
+ }
+ if (ACPI_FAILURE(status)) {
+ status = AE_CTRL_DEPTH;
+ goto exit;
+ }
+
+ tmp = get_root_bridge_busnr(handle);
+ if (tmp < 0) {
+ printk(KERN_ERR PREFIX
+ "Find root bridge failed for %s\n",
+ (char *)buffer.pointer);
+ status = AE_CTRL_DEPTH;
+ goto exit;
+ }
+ bus = tmp;
+
+ if (seg == find->seg && bus == find->bus)
+ find->handle = handle;
+ status = AE_OK;
+ exit:
+ acpi_os_free(buffer.pointer);
+ return status;
+}
+
+acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
+{
+ struct acpi_find_pci_root find = { seg, bus, NULL };
+
+ acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
+ return find.handle;
+}
+
+/* Get device's handler per its address under its parent */
+struct acpi_find_child {
+ acpi_handle handle;
+ acpi_integer address;
+};
+
+static acpi_status
+do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+ acpi_status status;
+ struct acpi_device_info *info;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct acpi_find_child *find = (struct acpi_find_child *)context;
+
+ status = acpi_get_object_info(handle, &buffer);
+ if (ACPI_SUCCESS(status)) {
+ info = buffer.pointer;
+ if (info->address == find->address)
+ find->handle = handle;
+ acpi_os_free(buffer.pointer);
+ }
+ return AE_OK;
+}
+
+acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
+{
+ struct acpi_find_child find = { NULL, address };
+
+ if (!parent)
+ return NULL;
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
+ 1, do_acpi_find_child, &find, NULL);
+ return find.handle;
+}
+
+EXPORT_SYMBOL(acpi_get_child);
+
+/* Link ACPI devices with physical devices */
+static void acpi_glue_data_handler(acpi_handle handle,
+ u32 function, void *context)
+{
+ /* we provide an empty handler */
+}
+
+/* Note: a success call will increase reference count by one */
+struct device *acpi_get_physical_device(acpi_handle handle)
+{
+ acpi_status status;
+ struct device *dev;
+
+ status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
+ if (ACPI_SUCCESS(status))
+ return get_device(dev);
+ return NULL;
+}
+
+EXPORT_SYMBOL(acpi_get_physical_device);
+
+static int acpi_bind_one(struct device *dev, acpi_handle handle)
+{
+ acpi_status status;
+
+ if (dev->firmware_data) {
+ printk(KERN_WARNING PREFIX
+ "Drivers changed 'firmware_data' for %s\n", dev->bus_id);
+ return -EINVAL;
+ }
+ get_device(dev);
+ status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
+ if (ACPI_FAILURE(status)) {
+ put_device(dev);
+ return -EINVAL;
+ }
+ dev->firmware_data = handle;
+
+ return 0;
+}
+
+static int acpi_unbind_one(struct device *dev)
+{
+ if (!dev->firmware_data)
+ return 0;
+ if (dev == acpi_get_physical_device(dev->firmware_data)) {
+ /* acpi_get_physical_device increase refcnt by one */
+ put_device(dev);
+ acpi_detach_data(dev->firmware_data, acpi_glue_data_handler);
+ dev->firmware_data = NULL;
+ /* acpi_bind_one increase refcnt by one */
+ put_device(dev);
+ } else {
+ printk(KERN_ERR PREFIX
+ "Oops, 'firmware_data' corrupt for %s\n", dev->bus_id);
+ }
+ return 0;
+}
+
+static int acpi_platform_notify(struct device *dev)
+{
+ struct acpi_bus_type *type;
+ acpi_handle handle;
+ int ret = -EINVAL;
+
+ if (!dev->bus || !dev->parent) {
+ /* bridge devices genernally haven't bus or parent */
+ ret = acpi_find_bridge_device(dev, &handle);
+ goto end;
+ }
+ type = acpi_get_bus_type(dev->bus);
+ if (!type) {
+ printk(KERN_INFO PREFIX "No ACPI bus support for %s\n",
+ dev->bus_id);
+ ret = -EINVAL;
+ goto end;
+ }
+ if ((ret = type->find_device(dev, &handle)) != 0)
+ printk(KERN_INFO PREFIX "Can't get handler for %s\n",
+ dev->bus_id);
+ end:
+ if (!ret)
+ acpi_bind_one(dev, handle);
+
+#if ACPI_GLUE_DEBUG
+ if (!ret) {
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+
+ acpi_get_name(dev->firmware_data, ACPI_FULL_PATHNAME, &buffer);
+ DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
+ acpi_os_free(buffer.pointer);
+ } else
+ DBG("Device %s -> No ACPI support\n", dev->bus_id);
+#endif
+
+ return ret;
+}
+
+static int acpi_platform_notify_remove(struct device *dev)
+{
+ acpi_unbind_one(dev);
+ return 0;
+}
+
+static int __init init_acpi_device_notify(void)
+{
+ if (acpi_disabled)
+ return 0;
+ if (platform_notify || platform_notify_remove) {
+ printk(KERN_ERR PREFIX "Can't use platform_notify\n");
+ return 0;
+ }
+ platform_notify = acpi_platform_notify;
+ platform_notify_remove = acpi_platform_notify_remove;
+ return 0;
+}
+
+arch_initcall(init_acpi_device_notify);