1 /*-
2 * Copyright (c) 2021 Adrian Chadd <adrian@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
26 #include <sys/param.h>
27 #include <sys/systm.h>
28 #include <sys/bus.h>
29 #include <sys/lock.h>
30 #include <sys/mutex.h>
31 #include <sys/rman.h>
32 #include <machine/bus.h>
33
34 #include <dev/clk/clk.h>
35 #include <dev/clk/clk_div.h>
36 #include <dev/clk/clk_fixed.h>
37 #include <dev/clk/clk_mux.h>
38
39 #include "qcom_clk_fdiv.h"
40
41 #include "clkdev_if.h"
42
43 /*
44 * This is a fixed divisor node. It represents some divisor
45 * that is setup by the boot environment and we don't have
46 * any need for the driver to go and fiddle with.
47 *
48 * It likely should just live in the extres/clk code.
49 */
50
51 struct qcom_clk_fdiv_sc {
52 struct clknode *clknode;
53 uint32_t divisor;
54 };
55
56 static int
qcom_clk_fdiv_recalc(struct clknode * clk,uint64_t * freq)57 qcom_clk_fdiv_recalc(struct clknode *clk, uint64_t *freq)
58 {
59 struct qcom_clk_fdiv_sc *sc;
60
61 sc = clknode_get_softc(clk);
62
63 if (freq == NULL || *freq == 0) {
64 printf("%s: called; NULL or 0 frequency\n", __func__);
65 return (ENXIO);
66 }
67
68 *freq = *freq / sc->divisor;
69 return (0);
70 }
71
72 static int
qcom_clk_fdiv_init(struct clknode * clk,device_t dev)73 qcom_clk_fdiv_init(struct clknode *clk, device_t dev)
74 {
75 /*
76 * There's only a single parent here for an fixed divisor,
77 * so just set it to 0; the caller doesn't need to supply it.
78 */
79 clknode_init_parent_idx(clk, 0);
80
81 return(0);
82 }
83
84 static clknode_method_t qcom_clk_fdiv_methods[] = {
85 /* Device interface */
86 CLKNODEMETHOD(clknode_init, qcom_clk_fdiv_init),
87 CLKNODEMETHOD(clknode_recalc_freq, qcom_clk_fdiv_recalc),
88 CLKNODEMETHOD_END
89 };
90
91 DEFINE_CLASS_1(qcom_clk_fepll, qcom_clk_fdiv_class, qcom_clk_fdiv_methods,
92 sizeof(struct qcom_clk_fdiv_sc), clknode_class);
93
94 int
qcom_clk_fdiv_register(struct clkdom * clkdom,struct qcom_clk_fdiv_def * clkdef)95 qcom_clk_fdiv_register(struct clkdom *clkdom, struct qcom_clk_fdiv_def *clkdef)
96 {
97 struct clknode *clk;
98 struct qcom_clk_fdiv_sc *sc;
99
100 clk = clknode_create(clkdom, &qcom_clk_fdiv_class, &clkdef->clkdef);
101 if (clk == NULL)
102 return (1);
103
104 sc = clknode_get_softc(clk);
105 sc->clknode = clk;
106
107 sc->divisor = clkdef->divisor;
108
109 clknode_register(clkdom, clk);
110
111 return (0);
112 }
113