1 /*-
2 * Copyright (c) 2006 M. Warner Losh <imp@FreeBSD.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD$
26 */
27
28 #define SPIBUS_IVAR(d) (struct spibus_ivar *) device_get_ivars(d)
29 #define SPIBUS_SOFTC(d) (struct spibus_softc *) device_get_softc(d)
30
31 struct spibus_softc
32 {
33 device_t dev;
34 };
35
36 #define SPIBUS_MODE_NONE 0
37 #define SPIBUS_MODE_CPHA 1
38 #define SPIBUS_MODE_CPOL 2
39 #define SPIBUS_MODE_CPOL_CPHA 3
40
41 struct spibus_ivar
42 {
43 uint32_t cs;
44 uint32_t mode;
45 uint32_t clock;
46 struct resource_list rl;
47 };
48
49 #define SPIBUS_CS_HIGH (1U << 31)
50
51 enum {
52 SPIBUS_IVAR_CS, /* chip select that we're on */
53 SPIBUS_IVAR_MODE, /* SPI mode (0-3) */
54 SPIBUS_IVAR_CLOCK, /* maximum clock freq for device */
55 };
56
57 #define SPIBUS_ACCESSOR(A, B, T) \
58 static inline int \
59 spibus_get_ ## A(device_t dev, T *t) \
60 { \
61 return BUS_READ_IVAR(device_get_parent(dev), dev, \
62 SPIBUS_IVAR_ ## B, (uintptr_t *) t); \
63 } \
64 static inline int \
65 spibus_set_ ## A(device_t dev, T t) \
66 { \
67 return BUS_WRITE_IVAR(device_get_parent(dev), dev, \
68 SPIBUS_IVAR_ ## B, (uintptr_t) t); \
69 }
70
71 SPIBUS_ACCESSOR(cs, CS, uint32_t)
72 SPIBUS_ACCESSOR(mode, MODE, uint32_t)
73 SPIBUS_ACCESSOR(clock, CLOCK, uint32_t)
74
75 extern driver_t spibus_driver;
76 extern devclass_t spibus_devclass;
77 extern driver_t ofw_spibus_driver;
78 extern devclass_t ofw_spibus_devclass;
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