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394b701c MP |
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 | */ | |
20 | static spinlock_t rio_config_lock = SPIN_LOCK_UNLOCKED; | |
21 | static 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) \ | |
43 | int __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) \ | |
67 | int __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 | ||
79 | RIO_LOP_READ(8, u8, 1) | |
80 | RIO_LOP_READ(16, u16, 2) | |
81 | RIO_LOP_READ(32, u32, 4) | |
82 | RIO_LOP_WRITE(8, u8, 1) | |
83 | RIO_LOP_WRITE(16, u16, 2) | |
84 | RIO_LOP_WRITE(32, u32, 4) | |
85 | ||
86 | EXPORT_SYMBOL_GPL(__rio_local_read_config_8); | |
87 | EXPORT_SYMBOL_GPL(__rio_local_read_config_16); | |
88 | EXPORT_SYMBOL_GPL(__rio_local_read_config_32); | |
89 | EXPORT_SYMBOL_GPL(__rio_local_write_config_8); | |
90 | EXPORT_SYMBOL_GPL(__rio_local_write_config_16); | |
91 | EXPORT_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) \ | |
103 | int 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) \ | |
127 | int 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 | ||
139 | RIO_OP_READ(8, u8, 1) | |
140 | RIO_OP_READ(16, u16, 2) | |
141 | RIO_OP_READ(32, u32, 4) | |
142 | RIO_OP_WRITE(8, u8, 1) | |
143 | RIO_OP_WRITE(16, u16, 2) | |
144 | RIO_OP_WRITE(32, u32, 4) | |
145 | ||
146 | EXPORT_SYMBOL_GPL(rio_mport_read_config_8); | |
147 | EXPORT_SYMBOL_GPL(rio_mport_read_config_16); | |
148 | EXPORT_SYMBOL_GPL(rio_mport_read_config_32); | |
149 | EXPORT_SYMBOL_GPL(rio_mport_write_config_8); | |
150 | EXPORT_SYMBOL_GPL(rio_mport_write_config_16); | |
151 | EXPORT_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 | */ | |
163 | int 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 | ||
175 | EXPORT_SYMBOL_GPL(rio_mport_send_doorbell); |