1 /*-
2 * Copyright 2016 Michal Meloun <mmel@FreeBSD.org>
3 * All rights reserved.
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: stable/12/sys/dev/extres/clk/clk_mux.c 296905 2016-03-15 15:28:24Z mmel $");
29
30
31 #include <sys/param.h>
32 #include <sys/conf.h>
33 #include <sys/bus.h>
34 #include <sys/kernel.h>
35 #include <sys/systm.h>
36
37 #include <machine/bus.h>
38
39 #include <dev/extres/clk/clk_mux.h>
40
41 #include "clkdev_if.h"
42
43 #define WR4(_clk, off, val) \
44 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val)
45 #define RD4(_clk, off, val) \
46 CLKDEV_READ_4(clknode_get_device(_clk), off, val)
47 #define MD4(_clk, off, clr, set ) \
48 CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set)
49 #define DEVICE_LOCK(_clk) \
50 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
51 #define DEVICE_UNLOCK(_clk) \
52 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
53
54 static int clknode_mux_init(struct clknode *clk, device_t dev);
55 static int clknode_mux_set_mux(struct clknode *clk, int idx);
56
57 struct clknode_mux_sc {
58 uint32_t offset;
59 uint32_t shift;
60 uint32_t mask;
61 int mux_flags;
62 };
63
64 static clknode_method_t clknode_mux_methods[] = {
65 /* Device interface */
66 CLKNODEMETHOD(clknode_init, clknode_mux_init),
67 CLKNODEMETHOD(clknode_set_mux, clknode_mux_set_mux),
68 CLKNODEMETHOD_END
69 };
70 DEFINE_CLASS_1(clknode_mux, clknode_mux_class, clknode_mux_methods,
71 sizeof(struct clknode_mux_sc), clknode_class);
72
73
74 static int
clknode_mux_init(struct clknode * clk,device_t dev)75 clknode_mux_init(struct clknode *clk, device_t dev)
76 {
77 uint32_t reg;
78 struct clknode_mux_sc *sc;
79 int rv;
80
81 sc = clknode_get_softc(clk);
82
83 DEVICE_LOCK(clk);
84 rv = RD4(clk, sc->offset, ®);
85 DEVICE_UNLOCK(clk);
86 if (rv != 0) {
87 return (rv);
88 }
89 reg = (reg >> sc->shift) & sc->mask;
90 clknode_init_parent_idx(clk, reg);
91 return(0);
92 }
93
94 static int
clknode_mux_set_mux(struct clknode * clk,int idx)95 clknode_mux_set_mux(struct clknode *clk, int idx)
96 {
97 uint32_t reg;
98 struct clknode_mux_sc *sc;
99 int rv;
100
101 sc = clknode_get_softc(clk);
102
103 DEVICE_LOCK(clk);
104 rv = MD4(clk, sc->offset, sc->mask << sc->shift,
105 (idx & sc->mask) << sc->shift);
106 if (rv != 0) {
107 DEVICE_UNLOCK(clk);
108 return (rv);
109 }
110 RD4(clk, sc->offset, ®);
111 DEVICE_UNLOCK(clk);
112
113 return(0);
114 }
115
116 int
clknode_mux_register(struct clkdom * clkdom,struct clk_mux_def * clkdef)117 clknode_mux_register(struct clkdom *clkdom, struct clk_mux_def *clkdef)
118 {
119 struct clknode *clk;
120 struct clknode_mux_sc *sc;
121
122 clk = clknode_create(clkdom, &clknode_mux_class, &clkdef->clkdef);
123 if (clk == NULL)
124 return (1);
125
126 sc = clknode_get_softc(clk);
127 sc->offset = clkdef->offset;
128 sc->shift = clkdef->shift;
129 sc->mask = (1 << clkdef->width) - 1;
130 sc->mux_flags = clkdef->mux_flags;
131
132 clknode_register(clkdom, clk);
133 return (0);
134 }
135