/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
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*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2007 - 2011 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.
*
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* General Public License for more details.
*
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* 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 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
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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_pm_support: must returns true if the bus can go to sleep
* @apm_config: will be called during the config of the APM
* @get_hw_id: prints the hw_id in the provided buffer
* @write8: write a byte to register at offset ofs
* @write32: write a dword to register at offset ofs
* @wread32: read a dword at register at offset ofs
*/
struct iwl_bus_ops {
bool (*get_pm_support)(struct iwl_bus *bus);
void (*apm_config)(struct iwl_bus *bus);
void (*get_hw_id)(struct iwl_bus *bus, char buf[], int buf_len);
void (*write8)(struct iwl_bus *bus, u32 ofs, u8 val);
void (*write32)(struct iwl_bus *bus, u32 ofs, u32 val);
u32 (*read32)(struct iwl_bus *bus, u32 ofs);
};
/**
* struct iwl_bus - bus common data
*
* This data is common to all bus layer implementations.
*
* @dev - pointer to struct device * that represents the device
* @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
* @irq - the irq number for the device
* @reg_lock - protect hw register access
*/
struct iwl_bus {
struct device *dev;
const struct iwl_bus_ops *ops;
struct iwl_shared *shrd;
unsigned int irq;
spinlock_t reg_lock;
/* 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 bool bus_get_pm_support(struct iwl_bus *bus)
{
return bus->ops->get_pm_support(bus);
}
static inline void bus_apm_config(struct iwl_bus *bus)
{
bus->ops->apm_config(bus);
}
static inline void bus_get_hw_id(struct iwl_bus *bus, char buf[], int buf_len)
{
bus->ops->get_hw_id(bus, buf, buf_len);
}
static inline void bus_write8(struct iwl_bus *bus, u32 ofs, u8 val)
{
bus->ops->write8(bus, ofs, val);
}
static inline void bus_write32(struct iwl_bus *bus, u32 ofs, u32 val)
{
bus->ops->write32(bus, ofs, val);
}
static inline u32 bus_read32(struct iwl_bus *bus, u32 ofs)
{
return bus->ops->read32(bus, ofs);
}
/*****************************************************
* Bus layer registration functions
******************************************************/
int __must_check iwl_pci_register_driver(void);
void iwl_pci_unregister_driver(void);
#endif /* __iwl_bus_h__ */
