1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
30 #include <sys/conf.h>
31 #include <sys/bus.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
34
35 #include <machine/bus.h>
36
37 #include <dev/clk/clk.h>
38
39 #include <arm64/freescale/imx/clk/imx_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 imx_clk_mux_init(struct clknode *clk, device_t dev);
55 static int imx_clk_mux_set_mux(struct clknode *clk, int idx);
56
57 struct imx_clk_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 imx_clk_mux_methods[] = {
65 /* Device interface */
66 CLKNODEMETHOD(clknode_init, imx_clk_mux_init),
67 CLKNODEMETHOD(clknode_set_mux, imx_clk_mux_set_mux),
68 CLKNODEMETHOD_END
69 };
70 DEFINE_CLASS_1(imx_clk_mux, imx_clk_mux_class, imx_clk_mux_methods,
71 sizeof(struct imx_clk_mux_sc), clknode_class);
72
73 static int
imx_clk_mux_init(struct clknode * clk,device_t dev)74 imx_clk_mux_init(struct clknode *clk, device_t dev)
75 {
76 uint32_t reg;
77 struct imx_clk_mux_sc *sc;
78 int rv;
79
80 sc = clknode_get_softc(clk);
81
82 DEVICE_LOCK(clk);
83 rv = RD4(clk, sc->offset, ®);
84 DEVICE_UNLOCK(clk);
85 if (rv != 0) {
86 return (rv);
87 }
88 reg = (reg >> sc->shift) & sc->mask;
89 clknode_init_parent_idx(clk, reg);
90 return(0);
91 }
92
93 static int
imx_clk_mux_set_mux(struct clknode * clk,int idx)94 imx_clk_mux_set_mux(struct clknode *clk, int idx)
95 {
96 uint32_t reg;
97 struct imx_clk_mux_sc *sc;
98 int rv;
99
100 sc = clknode_get_softc(clk);
101
102 DEVICE_LOCK(clk);
103 rv = MD4(clk, sc->offset, sc->mask << sc->shift,
104 ((idx & sc->mask) << sc->shift));
105 if (rv != 0) {
106 DEVICE_UNLOCK(clk);
107 return (rv);
108 }
109 RD4(clk, sc->offset, ®);
110 DEVICE_UNLOCK(clk);
111
112 return(0);
113 }
114
115 int
imx_clk_mux_register(struct clkdom * clkdom,struct imx_clk_mux_def * clkdef)116 imx_clk_mux_register(struct clkdom *clkdom, struct imx_clk_mux_def *clkdef)
117 {
118 struct clknode *clk;
119 struct imx_clk_mux_sc *sc;
120
121 clk = clknode_create(clkdom, &imx_clk_mux_class, &clkdef->clkdef);
122 if (clk == NULL)
123 return (1);
124
125 sc = clknode_get_softc(clk);
126 sc->offset = clkdef->offset;
127 sc->shift = clkdef->shift;
128 sc->mask = (1 << clkdef->width) - 1;
129 sc->mux_flags = clkdef->mux_flags;
130
131 clknode_register(clkdom, clk);
132 return (0);
133 }
134