summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwlwifi/iwl-bus.h
blob: 940d5038b39c2d93966f64dbcbf17efe25bc8bd6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
/******************************************************************************
 *
 * 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 - 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.
 *
 * 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 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/
#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_string: prints the hw_id in the provided buffer
 * @get_hw_id: get hw_id in u32
 * @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_string)(struct iwl_bus *bus, char buf[], int buf_len);
	u32 (*get_hw_id)(struct iwl_bus *bus);
	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_string(struct iwl_bus *bus, char buf[],
		int buf_len)
{
	bus->ops->get_hw_id_string(bus, buf, buf_len);
}

static inline u32 bus_get_hw_id(struct iwl_bus *bus)
{
	return bus->ops->get_hw_id(bus);
}

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__ */
OpenPOWER on IntegriCloud