1/* $NetBSD: imx_ccm_extclk.c,v 1.1 2020/12/23 14:42:38 skrll Exp $ */
2
3/*-
4 * Copyright (c) 2020 Jared McNeill <jmcneill@invisible.ca>
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 ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * 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__KERNEL_RCSID(0, "$NetBSD: imx_ccm_extclk.c,v 1.1 2020/12/23 14:42:38 skrll Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34
35#include <dev/clk/clk_backend.h>
36
37#include <arm/nxp/imx_ccm.h>
38
39#include <dev/fdt/fdtvar.h>
40
41int
42imx_ccm_extclk_enable(struct imx_ccm_softc *sc, struct imx_ccm_clk *clk,
43    int enable)
44{
45	struct clk *extclk;
46
47	KASSERT(clk->type == IMX_CCM_EXTCLK);
48
49	if ((extclk = fdtbus_clock_byname(clk->u.extclk)) == NULL)
50		return ENXIO;
51
52	return clk_enable(extclk);
53}
54
55u_int
56imx_ccm_extclk_get_rate(struct imx_ccm_softc *sc,
57    struct imx_ccm_clk *clk)
58{
59	struct clk *extclk;
60
61	KASSERT(clk->type == IMX_CCM_EXTCLK);
62
63	if ((extclk = fdtbus_clock_byname(clk->u.extclk)) == NULL)
64		return 0;
65
66	return clk_get_rate(extclk);
67}
68
69int
70imx_ccm_extclk_set_rate(struct imx_ccm_softc *sc,
71    struct imx_ccm_clk *clk, u_int rate)
72{
73	struct clk *extclk;
74
75	KASSERT(clk->type == IMX_CCM_EXTCLK);
76
77	if ((extclk = fdtbus_clock_byname(clk->u.extclk)) == NULL)
78		return ENXIO;
79
80	return clk_set_rate(extclk, rate);
81}
82
83const char *
84imx_ccm_extclk_get_parent(struct imx_ccm_softc *sc,
85    struct imx_ccm_clk *clk)
86{
87	struct clk *extclk, *clkp;
88
89	KASSERT(clk->type == IMX_CCM_EXTCLK);
90
91	if ((extclk = fdtbus_clock_byname(clk->u.extclk)) == NULL)
92		return NULL;
93
94	clkp = clk_get_parent(extclk);
95	if (clkp == NULL)
96		return NULL;
97
98	return clkp->name;
99}
100