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DEFINITIONS
This source file includes following definitions.
- config_lrandom
- lrandom_random
- lrandom_randmax
- lrandom_read
1 /*
2 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
3 * The President and Fellows of Harvard College.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /*
31 * Driver for LAMEbus random generator card
32 */
33 #include <types.h>
34 #include <lib.h>
35 #include <uio.h>
36 #include <platform/bus.h>
37 #include <lamebus/lrandom.h>
38 #include "autoconf.h"
39
40 /* Registers (offsets within slot) */
41 #define LR_REG_RAND 0 /* random register */
42
43 /* Constants */
44 #define LR_RANDMAX 0xffffffff
45
46 int
47 config_lrandom(struct lrandom_softc *lr, int lrandomno)
48 {
49 (void)lrandomno;
50 (void)lr;
51 return 0;
52 }
53
54 uint32_t
55 lrandom_random(void *devdata)
56 {
57 struct lrandom_softc *lr = devdata;
58 return bus_read_register(lr->lr_bus, lr->lr_buspos, LR_REG_RAND);
59 }
60
61 uint32_t
62 lrandom_randmax(void *devdata)
63 {
64 (void)devdata;
65 return LR_RANDMAX;
66 }
67
68 int
69 lrandom_read(void *devdata, struct uio *uio)
70 {
71 struct lrandom_softc *lr = devdata;
72 uint32_t val;
73 int result;
74
75 while (uio->uio_resid > 0) {
76 val = bus_read_register(lr->lr_bus, lr->lr_buspos,
77 LR_REG_RAND);
78 result = uiomove(&val, sizeof(val), uio);
79 if (result) {
80 return result;
81 }
82 }
83
84 return 0;
85 }