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 */
rio_mport_send_doorbell(struct rio_mport * mport,u16 destid,u16 data)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