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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 | */ |
20 | static DEFINE_SPINLOCK(rio_config_lock); |
21 | static DEFINE_SPINLOCK(rio_doorbell_lock); |
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, 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, 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, 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, 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, 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); |
176 |
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