1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright 2016 Michal Meloun <mmel@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/conf.h>
34 #include <sys/bus.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37
38 #include <machine/bus.h>
39
40 #include <dev/extres/clk/clk.h>
41
42 #include <arm64/freescale/imx/clk/imx_clk_mux.h>
43
44 #include "clkdev_if.h"
45
46 #define WR4(_clk, off, val) \
47 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val)
48 #define RD4(_clk, off, val) \
49 CLKDEV_READ_4(clknode_get_device(_clk), off, val)
50 #define MD4(_clk, off, clr, set ) \
51 CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set)
52 #define DEVICE_LOCK(_clk) \
53 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
54 #define DEVICE_UNLOCK(_clk) \
55 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
56
57 static int imx_clk_mux_init(struct clknode *clk, device_t dev);
58 static int imx_clk_mux_set_mux(struct clknode *clk, int idx);
59
60 struct imx_clk_mux_sc {
61 uint32_t offset;
62 uint32_t shift;
63 uint32_t mask;
64 int mux_flags;
65 };
66
67 static clknode_method_t imx_clk_mux_methods[] = {
68 /* Device interface */
69 CLKNODEMETHOD(clknode_init, imx_clk_mux_init),
70 CLKNODEMETHOD(clknode_set_mux, imx_clk_mux_set_mux),
71 CLKNODEMETHOD_END
72 };
73 DEFINE_CLASS_1(imx_clk_mux, imx_clk_mux_class, imx_clk_mux_methods,
74 sizeof(struct imx_clk_mux_sc), clknode_class);
75
76 static int
77 imx_clk_mux_init(struct clknode *clk, device_t dev)
78 {
79 uint32_t reg;
80 struct imx_clk_mux_sc *sc;
81 int rv;
82
83 sc = clknode_get_softc(clk);
84
85 DEVICE_LOCK(clk);
86 rv = RD4(clk, sc->offset, ®);
87 DEVICE_UNLOCK(clk);
88 if (rv != 0) {
89 return (rv);
90 }
91 reg = (reg >> sc->shift) & sc->mask;
92 clknode_init_parent_idx(clk, reg);
93 return(0);
94 }
95
96 static int
97 imx_clk_mux_set_mux(struct clknode *clk, int idx)
98 {
99 uint32_t reg;
100 struct imx_clk_mux_sc *sc;
101 int rv;
102
103 sc = clknode_get_softc(clk);
104
105 DEVICE_LOCK(clk);
106 rv = MD4(clk, sc->offset, sc->mask << sc->shift,
107 ((idx & sc->mask) << sc->shift));
108 if (rv != 0) {
109 DEVICE_UNLOCK(clk);
110 return (rv);
111 }
112 RD4(clk, sc->offset, ®);
113 DEVICE_UNLOCK(clk);
114
115 return(0);
116 }
117
118 int
119 imx_clk_mux_register(struct clkdom *clkdom, struct imx_clk_mux_def *clkdef)
120 {
121 struct clknode *clk;
122 struct imx_clk_mux_sc *sc;
123
124 clk = clknode_create(clkdom, &imx_clk_mux_class, &clkdef->clkdef);
125 if (clk == NULL)
126 return (1);
127
128 sc = clknode_get_softc(clk);
129 sc->offset = clkdef->offset;
130 sc->shift = clkdef->shift;
131 sc->mask = (1 << clkdef->width) - 1;
132 sc->mux_flags = clkdef->mux_flags;
133
134 clknode_register(clkdom, clk);
135 return (0);
136 }
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