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
41 int
imx_ccm_extclk_enable(struct imx_ccm_softc * sc,struct imx_ccm_clk * clk,int enable)42 imx_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
55 u_int
imx_ccm_extclk_get_rate(struct imx_ccm_softc * sc,struct imx_ccm_clk * clk)56 imx_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
69 int
imx_ccm_extclk_set_rate(struct imx_ccm_softc * sc,struct imx_ccm_clk * clk,u_int rate)70 imx_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
83 const char *
imx_ccm_extclk_get_parent(struct imx_ccm_softc * sc,struct imx_ccm_clk * clk)84 imx_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