| /****************************************************************************** |
| * |
| * This file is provided under a dual BSD/GPLv2 license. When using or |
| * redistributing this file, you may do so under either license. |
| * |
| * GPL LICENSE SUMMARY |
| * |
| * Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of version 2 of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110, |
| * USA |
| * |
| * The full GNU General Public License is included in this distribution |
| * in the file called LICENSE.GPL. |
| * |
| * Contact Information: |
| * Intel Linux Wireless <ilw@linux.intel.com> |
| * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
| * |
| * BSD LICENSE |
| * |
| * Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved. |
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| * from this software without specific prior written permission. |
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| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| *****************************************************************************/ |
| #ifndef __iwl_bus_h__ |
| #define __iwl_bus_h__ |
| |
| #include <linux/types.h> |
| #include <linux/spinlock.h> |
| |
| /** |
| * DOC: Bus layer - role and goal |
| * |
| * iwl-bus.h defines the API to the bus layer of the iwlwifi driver. |
| * The bus layer is responsible for doing very basic bus operations that are |
| * listed in the iwl_bus_ops structure. |
| * The bus layer registers to the bus driver, advertises the supported HW and |
| * gets notifications about enumeration, suspend, resume. |
| * For the moment, the bus layer is not a linux kernel module as itself, and |
| * the module_init function of the driver must call the bus specific |
| * registration functions. These functions are listed at the end of this file. |
| * For the moment, there is only one implementation of this interface: PCI-e. |
| * This implementation is iwl-pci.c |
| */ |
| |
| /** |
| * DOC: encapsulation and type safety |
| * |
| * The iwl_bus describes the data that is shared amongst all the bus layer |
| * implementations. This data is visible to other layers. Data in the bus |
| * specific area is not visible outside the bus specific implementation. |
| * iwl_bus holds a pointer to iwl_shared which holds pointer to all the other |
| * layers of the driver (iwl_priv, iwl_trans). In fact, this is the way to go |
| * when the transport layer needs to call a function of another layer. |
| * |
| * In order to achieve encapsulation, iwl_priv cannot be dereferenced from the |
| * bus layer. Type safety is still kept since functions that gets iwl_priv gets |
| * a typed pointer (as opposed to void *). |
| */ |
| |
| /** |
| * DOC: probe flow |
| * |
| * The module_init calls the bus specific registration function. The |
| * registration to the bus layer will trigger an enumeration of the bus which |
| * will call the bus specific probe function. |
| * The first thing this function must do is to allocate the memory needed by |
| * iwl_bus + the bus_specific data. |
| * Once the bus specific probe function has configured the hardware, it |
| * chooses the appropriate transport layer and calls iwl_probe that will run |
| * the bus independent probe flow. |
| * |
| * Note: The bus specific code must set the following data in iwl_bus before it |
| * calls iwl_probe: |
| * * bus->dev |
| * * bus->irq |
| * * bus->ops |
| */ |
| |
| struct iwl_shared; |
| struct iwl_bus; |
| |
| /** |
| * struct iwl_bus_ops - bus specific operations |
| * @get_hw_id: get hw_id in u32 |
| */ |
| struct iwl_bus_ops { |
| u32 (*get_hw_id)(struct iwl_bus *bus); |
| }; |
| |
| /** |
| * struct iwl_bus - bus common data |
| * |
| * This data is common to all bus layer implementations. |
| * |
| * @ops - pointer to iwl_bus_ops |
| * @shrd - pointer to iwl_shared which holds shared data from the upper layer |
| * NB: for the time being this needs to be set by the upper layer since |
| * it allocates the shared data |
| */ |
| struct iwl_bus { |
| const struct iwl_bus_ops *ops; |
| struct iwl_shared *shrd; |
| |
| /* pointer to bus specific struct */ |
| /*Ensure that this pointer will always be aligned to sizeof pointer */ |
| char bus_specific[0] __attribute__((__aligned__(sizeof(void *)))); |
| }; |
| |
| static inline u32 bus_get_hw_id(struct iwl_bus *bus) |
| { |
| return bus->ops->get_hw_id(bus); |
| } |
| |
| /***************************************************** |
| * Bus layer registration functions |
| ******************************************************/ |
| int __must_check iwl_pci_register_driver(void); |
| void iwl_pci_unregister_driver(void); |
| |
| #endif /* __iwl_bus_h__ */ |