361 lines
8.5 KiB
C
361 lines
8.5 KiB
C
/*
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* Link physical devices with ACPI devices support
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*
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* Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (c) 2005 Intel Corp.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/rwsem.h>
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#include <linux/acpi.h>
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#define ACPI_GLUE_DEBUG 0
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#if ACPI_GLUE_DEBUG
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#define DBG(x...) printk(PREFIX x)
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#else
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#define DBG(x...)
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#endif
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static LIST_HEAD(bus_type_list);
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static DECLARE_RWSEM(bus_type_sem);
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int register_acpi_bus_type(struct acpi_bus_type *type)
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{
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if (acpi_disabled)
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return -ENODEV;
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if (type && type->bus && type->find_device) {
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down_write(&bus_type_sem);
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list_add_tail(&type->list, &bus_type_list);
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up_write(&bus_type_sem);
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printk(KERN_INFO PREFIX "bus type %s registered\n",
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type->bus->name);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL(register_acpi_bus_type);
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int unregister_acpi_bus_type(struct acpi_bus_type *type)
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{
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if (acpi_disabled)
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return 0;
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if (type) {
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down_write(&bus_type_sem);
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list_del_init(&type->list);
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up_write(&bus_type_sem);
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printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
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type->bus->name);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL(unregister_acpi_bus_type);
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static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
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{
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struct acpi_bus_type *tmp, *ret = NULL;
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down_read(&bus_type_sem);
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list_for_each_entry(tmp, &bus_type_list, list) {
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if (tmp->bus == type) {
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ret = tmp;
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break;
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}
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}
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up_read(&bus_type_sem);
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return ret;
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}
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static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
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{
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struct acpi_bus_type *tmp;
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int ret = -ENODEV;
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down_read(&bus_type_sem);
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list_for_each_entry(tmp, &bus_type_list, list) {
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if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
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ret = 0;
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break;
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}
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}
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up_read(&bus_type_sem);
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return ret;
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}
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/* Get PCI root bridge's handle from its segment and bus number */
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struct acpi_find_pci_root {
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unsigned int seg;
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unsigned int bus;
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acpi_handle handle;
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};
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static acpi_status
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do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
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{
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unsigned long *busnr = (unsigned long *)data;
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struct acpi_resource_address64 address;
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if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
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resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
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resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
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return AE_OK;
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acpi_resource_to_address64(resource, &address);
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if ((address.address_length > 0) &&
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(address.resource_type == ACPI_BUS_NUMBER_RANGE))
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*busnr = address.minimum;
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return AE_OK;
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}
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static int get_root_bridge_busnr(acpi_handle handle)
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{
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acpi_status status;
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unsigned long bus, bbn;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
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status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
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&bbn);
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if (status == AE_NOT_FOUND) {
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/* Assume bus = 0 */
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printk(KERN_INFO PREFIX
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"Assume root bridge [%s] bus is 0\n",
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(char *)buffer.pointer);
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status = AE_OK;
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bbn = 0;
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}
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if (ACPI_FAILURE(status)) {
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bbn = -ENODEV;
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goto exit;
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}
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if (bbn > 0)
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goto exit;
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/* _BBN in some systems return 0 for all root bridges */
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bus = -1;
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status = acpi_walk_resources(handle, METHOD_NAME__CRS,
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do_root_bridge_busnr_callback, &bus);
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/* If _CRS failed, we just use _BBN */
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if (ACPI_FAILURE(status) || (bus == -1))
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goto exit;
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/* We select _CRS */
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if (bbn != bus) {
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printk(KERN_INFO PREFIX
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"_BBN and _CRS returns different value for %s. Select _CRS\n",
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(char *)buffer.pointer);
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bbn = bus;
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}
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exit:
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acpi_os_free(buffer.pointer);
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return (int)bbn;
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}
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static acpi_status
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find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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struct acpi_find_pci_root *find = (struct acpi_find_pci_root *)context;
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unsigned long seg, bus;
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acpi_status status;
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int tmp;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
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status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg);
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if (status == AE_NOT_FOUND) {
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/* Assume seg = 0 */
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status = AE_OK;
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seg = 0;
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}
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if (ACPI_FAILURE(status)) {
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status = AE_CTRL_DEPTH;
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goto exit;
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}
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tmp = get_root_bridge_busnr(handle);
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if (tmp < 0) {
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printk(KERN_ERR PREFIX
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"Find root bridge failed for %s\n",
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(char *)buffer.pointer);
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status = AE_CTRL_DEPTH;
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goto exit;
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}
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bus = tmp;
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if (seg == find->seg && bus == find->bus)
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find->handle = handle;
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status = AE_OK;
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exit:
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acpi_os_free(buffer.pointer);
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return status;
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}
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acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
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{
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struct acpi_find_pci_root find = { seg, bus, NULL };
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acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
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return find.handle;
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}
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EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
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/* Get device's handler per its address under its parent */
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struct acpi_find_child {
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acpi_handle handle;
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acpi_integer address;
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};
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static acpi_status
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do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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acpi_status status;
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struct acpi_device_info *info;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_find_child *find = (struct acpi_find_child *)context;
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status = acpi_get_object_info(handle, &buffer);
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if (ACPI_SUCCESS(status)) {
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info = buffer.pointer;
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if (info->address == find->address)
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find->handle = handle;
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acpi_os_free(buffer.pointer);
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}
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return AE_OK;
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}
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acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
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{
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struct acpi_find_child find = { NULL, address };
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if (!parent)
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return NULL;
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acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
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1, do_acpi_find_child, &find, NULL);
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return find.handle;
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}
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EXPORT_SYMBOL(acpi_get_child);
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/* Link ACPI devices with physical devices */
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static void acpi_glue_data_handler(acpi_handle handle,
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u32 function, void *context)
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{
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/* we provide an empty handler */
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}
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/* Note: a success call will increase reference count by one */
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struct device *acpi_get_physical_device(acpi_handle handle)
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{
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acpi_status status;
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struct device *dev;
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status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
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if (ACPI_SUCCESS(status))
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return get_device(dev);
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return NULL;
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}
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EXPORT_SYMBOL(acpi_get_physical_device);
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static int acpi_bind_one(struct device *dev, acpi_handle handle)
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{
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acpi_status status;
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if (dev->firmware_data) {
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printk(KERN_WARNING PREFIX
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"Drivers changed 'firmware_data' for %s\n", dev->bus_id);
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return -EINVAL;
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}
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get_device(dev);
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status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
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if (ACPI_FAILURE(status)) {
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put_device(dev);
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return -EINVAL;
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}
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dev->firmware_data = handle;
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return 0;
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}
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static int acpi_unbind_one(struct device *dev)
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{
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if (!dev->firmware_data)
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return 0;
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if (dev == acpi_get_physical_device(dev->firmware_data)) {
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/* acpi_get_physical_device increase refcnt by one */
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put_device(dev);
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acpi_detach_data(dev->firmware_data, acpi_glue_data_handler);
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dev->firmware_data = NULL;
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/* acpi_bind_one increase refcnt by one */
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put_device(dev);
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} else {
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printk(KERN_ERR PREFIX
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"Oops, 'firmware_data' corrupt for %s\n", dev->bus_id);
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}
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return 0;
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}
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static int acpi_platform_notify(struct device *dev)
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{
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struct acpi_bus_type *type;
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acpi_handle handle;
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int ret = -EINVAL;
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if (!dev->bus || !dev->parent) {
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/* bridge devices genernally haven't bus or parent */
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ret = acpi_find_bridge_device(dev, &handle);
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goto end;
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}
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type = acpi_get_bus_type(dev->bus);
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if (!type) {
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DBG("No ACPI bus support for %s\n", dev->bus_id);
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ret = -EINVAL;
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goto end;
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}
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if ((ret = type->find_device(dev, &handle)) != 0)
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DBG("Can't get handler for %s\n", dev->bus_id);
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end:
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if (!ret)
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acpi_bind_one(dev, handle);
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#if ACPI_GLUE_DEBUG
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if (!ret) {
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(dev->firmware_data, ACPI_FULL_PATHNAME, &buffer);
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DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
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acpi_os_free(buffer.pointer);
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} else
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DBG("Device %s -> No ACPI support\n", dev->bus_id);
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#endif
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return ret;
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}
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static int acpi_platform_notify_remove(struct device *dev)
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{
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acpi_unbind_one(dev);
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return 0;
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}
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static int __init init_acpi_device_notify(void)
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{
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if (acpi_disabled)
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return 0;
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if (platform_notify || platform_notify_remove) {
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printk(KERN_ERR PREFIX "Can't use platform_notify\n");
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return 0;
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}
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platform_notify = acpi_platform_notify;
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platform_notify_remove = acpi_platform_notify_remove;
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return 0;
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}
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arch_initcall(init_acpi_device_notify);
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