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
51struct qcom_clk_fdiv_sc {
52	struct clknode	*clknode;
53	uint32_t divisor;
54};
55
56static int
57qcom_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
72static int
73qcom_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
84static 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
91DEFINE_CLASS_1(qcom_clk_fepll, qcom_clk_fdiv_class, qcom_clk_fdiv_methods,
92   sizeof(struct qcom_clk_fdiv_sc), clknode_class);
93
94int
95qcom_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