1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * RapidIO configuration space access support
4 *
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
7 */
8
9 #include <linux/rio.h>
10 #include <linux/module.h>
11
12 /*
13 * Wrappers for all RIO configuration access functions. They just check
14 * alignment and call the low-level functions pointed to by rio_mport->ops.
15 */
16
17 #define RIO_8_BAD 0
18 #define RIO_16_BAD (offset & 1)
19 #define RIO_32_BAD (offset & 3)
20
21 /**
22 * RIO_LOP_READ - Generate rio_local_read_config_* functions
23 * @size: Size of configuration space read (8, 16, 32 bits)
24 * @type: C type of value argument
25 * @len: Length of configuration space read (1, 2, 4 bytes)
26 *
27 * Generates rio_local_read_config_* functions used to access
28 * configuration space registers on the local device.
29 */
30 #define RIO_LOP_READ(size,type,len) \
31 int __rio_local_read_config_##size \
32 (struct rio_mport *mport, u32 offset, type *value) \
33 { \
34 int res; \
35 u32 data = 0; \
36 if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
37 res = mport->ops->lcread(mport, mport->id, offset, len, &data); \
38 *value = (type)data; \
39 return res; \
40 }
41
42 /**
43 * RIO_LOP_WRITE - Generate rio_local_write_config_* functions
44 * @size: Size of configuration space write (8, 16, 32 bits)
45 * @type: C type of value argument
46 * @len: Length of configuration space write (1, 2, 4 bytes)
47 *
48 * Generates rio_local_write_config_* functions used to access
49 * configuration space registers on the local device.
50 */
51 #define RIO_LOP_WRITE(size,type,len) \
52 int __rio_local_write_config_##size \
53 (struct rio_mport *mport, u32 offset, type value) \
54 { \
55 if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
56 return mport->ops->lcwrite(mport, mport->id, offset, len, value);\
57 }
58
59 RIO_LOP_READ(8, u8, 1)
60 RIO_LOP_READ(16, u16, 2)
61 RIO_LOP_READ(32, u32, 4)
62 RIO_LOP_WRITE(8, u8, 1)
63 RIO_LOP_WRITE(16, u16, 2)
64 RIO_LOP_WRITE(32, u32, 4)
65
66 EXPORT_SYMBOL_GPL(__rio_local_read_config_8);
67 EXPORT_SYMBOL_GPL(__rio_local_read_config_16);
68 EXPORT_SYMBOL_GPL(__rio_local_read_config_32);
69 EXPORT_SYMBOL_GPL(__rio_local_write_config_8);
70 EXPORT_SYMBOL_GPL(__rio_local_write_config_16);
71 EXPORT_SYMBOL_GPL(__rio_local_write_config_32);
72
73 /**
74 * RIO_OP_READ - Generate rio_mport_read_config_* functions
75 * @size: Size of configuration space read (8, 16, 32 bits)
76 * @type: C type of value argument
77 * @len: Length of configuration space read (1, 2, 4 bytes)
78 *
79 * Generates rio_mport_read_config_* functions used to access
80 * configuration space registers on the local device.
81 */
82 #define RIO_OP_READ(size,type,len) \
83 int rio_mport_read_config_##size \
84 (struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type *value) \
85 { \
86 int res; \
87 u32 data = 0; \
88 if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
89 res = mport->ops->cread(mport, mport->id, destid, hopcount, offset, len, &data); \
90 *value = (type)data; \
91 return res; \
92 }
93
94 /**
95 * RIO_OP_WRITE - Generate rio_mport_write_config_* functions
96 * @size: Size of configuration space write (8, 16, 32 bits)
97 * @type: C type of value argument
98 * @len: Length of configuration space write (1, 2, 4 bytes)
99 *
100 * Generates rio_mport_write_config_* functions used to access
101 * configuration space registers on the local device.
102 */
103 #define RIO_OP_WRITE(size,type,len) \
104 int rio_mport_write_config_##size \
105 (struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type value) \
106 { \
107 if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
108 return mport->ops->cwrite(mport, mport->id, destid, hopcount, \
109 offset, len, value); \
110 }
111
112 RIO_OP_READ(8, u8, 1)
113 RIO_OP_READ(16, u16, 2)
114 RIO_OP_READ(32, u32, 4)
115 RIO_OP_WRITE(8, u8, 1)
116 RIO_OP_WRITE(16, u16, 2)
117 RIO_OP_WRITE(32, u32, 4)
118
119 EXPORT_SYMBOL_GPL(rio_mport_read_config_8);
120 EXPORT_SYMBOL_GPL(rio_mport_read_config_16);
121 EXPORT_SYMBOL_GPL(rio_mport_read_config_32);
122 EXPORT_SYMBOL_GPL(rio_mport_write_config_8);
123 EXPORT_SYMBOL_GPL(rio_mport_write_config_16);
124 EXPORT_SYMBOL_GPL(rio_mport_write_config_32);
125
126 /**
127 * rio_mport_send_doorbell - Send a doorbell message
128 *
129 * @mport: RIO master port
130 * @destid: RIO device destination ID
131 * @data: Doorbell message data
132 *
133 * Send a doorbell message to a RIO device. The doorbell message
134 * has a 16-bit info field provided by the data argument.
135 */
136 int rio_mport_send_doorbell(struct rio_mport *mport, u16 destid, u16 data)
137 {
138 return mport->ops->dsend(mport, mport->id, destid, data);
139 }
140
141 EXPORT_SYMBOL_GPL(rio_mport_send_doorbell);