Commit 4e10d12a authored by David Shaohua Li's avatar David Shaohua Li Committed by Len Brown
Browse files

[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: default avatarDavid Shaohua Li <shaohua.li@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent fb9802fa

drivers/acpi/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

drivers/acpi/glue.c

0 → 100644
+362 −0
Original line number Diff line number Diff line 
/*

 * 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);

drivers/acpi/ibm_acpi.c

+2 −2
Original line number Diff line number Diff line
@@ -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) {

include/acpi/acpi_bus.h

+21 −0
Original line number Diff line number Diff line
@@ -336,6 +336,27 @@ int acpi_match_ids (struct acpi_device *device, char *ids); 
int acpi_create_dir(struct acpi_device *);

void acpi_remove_dir(struct acpi_device *);





/*

 * Bind physical devices with ACPI devices

 */

#include <linux/device.h>

struct acpi_bus_type {

	struct list_head	list;

	struct bus_type		*bus;

	/* For general devices under the bus*/

	int (*find_device)(struct device *, acpi_handle*);

	/* For bridges, such as PCI root bridge, IDE controller */

	int (*find_bridge)(struct device *, acpi_handle *);

};

int register_acpi_bus_type(struct acpi_bus_type *);

int unregister_acpi_bus_type(struct acpi_bus_type *);

struct device *acpi_get_physical_device(acpi_handle);

/* helper */

acpi_handle acpi_get_child(acpi_handle, acpi_integer);

acpi_handle acpi_get_pci_rootbridge_handle(unsigned int, unsigned int);

#define DEVICE_ACPI_HANDLE(dev) ((acpi_handle)((dev)->firmware_data))



#endif /*CONFIG_ACPI_BUS*/



#endif /*__ACPI_BUS_H__*/

include/linux/device.h

+4 −2
Original line number Diff line number Diff line
@@ -269,8 +269,10 @@ struct device { 
	struct device_driver *driver;	/* which driver has allocated this

					   device */

	void		*driver_data;	/* data private to the driver */

	void		*platform_data;	/* Platform specific data (e.g. ACPI,

					   BIOS data relevant to device) */

	void		*platform_data;	/* Platform specific data, device

					   core doesn't touch it */

	void		*firmware_data; /* Firmware specific data (e.g. ACPI,

					   BIOS data),reserved for device core*/

	struct dev_pm_info	power;



	u64		*dma_mask;	/* dma mask (if dma'able device) */

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