[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>

3 files changed, 365 insertions, 3 deletions

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 24eb397e17b8..ad67e8f61e6c 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -36,7 +36,7 @@ processor-objs	+= processor_perflib.o
 endif
 
 obj-$(CONFIG_ACPI_BUS)          += sleep/
-obj-$(CONFIG_ACPI_BUS)          += bus.o
+obj-$(CONFIG_ACPI_BUS)          += bus.o glue.o
 obj-$(CONFIG_ACPI_AC)           += ac.o
 obj-$(CONFIG_ACPI_BATTERY)      += battery.o
 obj-$(CONFIG_ACPI_BUTTON)       += button.o
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
new file mode 100644
index 000000000000..b6d2045caf3e
--- /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);
diff --git a/drivers/acpi/ibm_acpi.c b/drivers/acpi/ibm_acpi.c
index 6c8291c3e774..ad85e10001f4 100644
--- a/drivers/acpi/ibm_acpi.c
+++ b/drivers/acpi/ibm_acpi.c
@@ -1025,7 +1025,7 @@ static int setup_notify(struct ibm_struct *ibm)
         return 0;
 }
 
-static int device_add(struct acpi_device *device)
+static int ibmacpi_device_add(struct acpi_device *device)
 {
         return 0;
 }
@@ -1043,7 +1043,7 @@ static int register_driver(struct ibm_struct *ibm)
         memset(ibm->driver, 0, sizeof(struct acpi_driver));
         sprintf(ibm->driver->name, "%s/%s", IBM_NAME, ibm->name);
         ibm->driver->ids = ibm->hid;
-        ibm->driver->ops.add = &device_add;
+        ibm->driver->ops.add = &ibmacpi_device_add;
 
         ret = acpi_bus_register_driver(ibm->driver);
         if (ret < 0) {