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-rw-r--r--drivers/rapidio/rio-access.c175
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/rapidio/rio-access.c b/drivers/rapidio/rio-access.c
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1/*
2 * RapidIO configuration space access support
3 *
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13#include <linux/rio.h>
14#include <linux/module.h>
15
16/*
17 * These interrupt-safe spinlocks protect all accesses to RIO
18 * configuration space and doorbell access.
19 */
20static spinlock_t rio_config_lock = SPIN_LOCK_UNLOCKED;
21static spinlock_t rio_doorbell_lock = SPIN_LOCK_UNLOCKED;
22
23/*
24 * Wrappers for all RIO configuration access functions. They just check
25 * alignment, do locking and call the low-level functions pointed to
26 * by rio_mport->ops.
27 */
28
29#define RIO_8_BAD 0
30#define RIO_16_BAD (offset & 1)
31#define RIO_32_BAD (offset & 3)
32
33/**
34 * RIO_LOP_READ - Generate rio_local_read_config_* functions
35 * @size: Size of configuration space read (8, 16, 32 bits)
36 * @type: C type of value argument
37 * @len: Length of configuration space read (1, 2, 4 bytes)
38 *
39 * Generates rio_local_read_config_* functions used to access
40 * configuration space registers on the local device.
41 */
42#define RIO_LOP_READ(size,type,len) \
43int __rio_local_read_config_##size \
44 (struct rio_mport *mport, u32 offset, type *value) \
45{ \
46 int res; \
47 unsigned long flags; \
48 u32 data = 0; \
49 if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
50 spin_lock_irqsave(&rio_config_lock, flags); \
51 res = mport->ops->lcread(mport->id, offset, len, &data); \
52 *value = (type)data; \
53 spin_unlock_irqrestore(&rio_config_lock, flags); \
54 return res; \
55}
56
57/**
58 * RIO_LOP_WRITE - Generate rio_local_write_config_* functions
59 * @size: Size of configuration space write (8, 16, 32 bits)
60 * @type: C type of value argument
61 * @len: Length of configuration space write (1, 2, 4 bytes)
62 *
63 * Generates rio_local_write_config_* functions used to access
64 * configuration space registers on the local device.
65 */
66#define RIO_LOP_WRITE(size,type,len) \
67int __rio_local_write_config_##size \
68 (struct rio_mport *mport, u32 offset, type value) \
69{ \
70 int res; \
71 unsigned long flags; \
72 if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
73 spin_lock_irqsave(&rio_config_lock, flags); \
74 res = mport->ops->lcwrite(mport->id, offset, len, value); \
75 spin_unlock_irqrestore(&rio_config_lock, flags); \
76 return res; \
77}
78
79RIO_LOP_READ(8, u8, 1)
80RIO_LOP_READ(16, u16, 2)
81RIO_LOP_READ(32, u32, 4)
82RIO_LOP_WRITE(8, u8, 1)
83RIO_LOP_WRITE(16, u16, 2)
84RIO_LOP_WRITE(32, u32, 4)
85
86EXPORT_SYMBOL_GPL(__rio_local_read_config_8);
87EXPORT_SYMBOL_GPL(__rio_local_read_config_16);
88EXPORT_SYMBOL_GPL(__rio_local_read_config_32);
89EXPORT_SYMBOL_GPL(__rio_local_write_config_8);
90EXPORT_SYMBOL_GPL(__rio_local_write_config_16);
91EXPORT_SYMBOL_GPL(__rio_local_write_config_32);
92
93/**
94 * RIO_OP_READ - Generate rio_mport_read_config_* functions
95 * @size: Size of configuration space read (8, 16, 32 bits)
96 * @type: C type of value argument
97 * @len: Length of configuration space read (1, 2, 4 bytes)
98 *
99 * Generates rio_mport_read_config_* functions used to access
100 * configuration space registers on the local device.
101 */
102#define RIO_OP_READ(size,type,len) \
103int rio_mport_read_config_##size \
104 (struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type *value) \
105{ \
106 int res; \
107 unsigned long flags; \
108 u32 data = 0; \
109 if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
110 spin_lock_irqsave(&rio_config_lock, flags); \
111 res = mport->ops->cread(mport->id, destid, hopcount, offset, len, &data); \
112 *value = (type)data; \
113 spin_unlock_irqrestore(&rio_config_lock, flags); \
114 return res; \
115}
116
117/**
118 * RIO_OP_WRITE - Generate rio_mport_write_config_* functions
119 * @size: Size of configuration space write (8, 16, 32 bits)
120 * @type: C type of value argument
121 * @len: Length of configuration space write (1, 2, 4 bytes)
122 *
123 * Generates rio_mport_write_config_* functions used to access
124 * configuration space registers on the local device.
125 */
126#define RIO_OP_WRITE(size,type,len) \
127int rio_mport_write_config_##size \
128 (struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type value) \
129{ \
130 int res; \
131 unsigned long flags; \
132 if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
133 spin_lock_irqsave(&rio_config_lock, flags); \
134 res = mport->ops->cwrite(mport->id, destid, hopcount, offset, len, value); \
135 spin_unlock_irqrestore(&rio_config_lock, flags); \
136 return res; \
137}
138
139RIO_OP_READ(8, u8, 1)
140RIO_OP_READ(16, u16, 2)
141RIO_OP_READ(32, u32, 4)
142RIO_OP_WRITE(8, u8, 1)
143RIO_OP_WRITE(16, u16, 2)
144RIO_OP_WRITE(32, u32, 4)
145
146EXPORT_SYMBOL_GPL(rio_mport_read_config_8);
147EXPORT_SYMBOL_GPL(rio_mport_read_config_16);
148EXPORT_SYMBOL_GPL(rio_mport_read_config_32);
149EXPORT_SYMBOL_GPL(rio_mport_write_config_8);
150EXPORT_SYMBOL_GPL(rio_mport_write_config_16);
151EXPORT_SYMBOL_GPL(rio_mport_write_config_32);
152
153/**
154 * rio_mport_send_doorbell - Send a doorbell message
155 *
156 * @mport: RIO master port
157 * @destid: RIO device destination ID
158 * @data: Doorbell message data
159 *
160 * Send a doorbell message to a RIO device. The doorbell message
161 * has a 16-bit info field provided by the data argument.
162 */
163int rio_mport_send_doorbell(struct rio_mport *mport, u16 destid, u16 data)
164{
165 int res;
166 unsigned long flags;
167
168 spin_lock_irqsave(&rio_doorbell_lock, flags);
169 res = mport->ops->dsend(mport->id, destid, data);
170 spin_unlock_irqrestore(&rio_doorbell_lock, flags);
171
172 return res;
173}
174
175EXPORT_SYMBOL_GPL(rio_mport_send_doorbell);
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