1 /* $NetBSD: sunxi_ccu_mux.c,v 1.1 2021/11/07 17:13:12 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2021 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: sunxi_ccu_mux.c,v 1.1 2021/11/07 17:13:12 jmcneill Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34
35 #include <dev/clk/clk_backend.h>
36
37 #include <arm/sunxi/sunxi_ccu.h>
38
39 int
sunxi_ccu_mux_set_parent(struct sunxi_ccu_softc * sc,struct sunxi_ccu_clk * clk,const char * name)40 sunxi_ccu_mux_set_parent(struct sunxi_ccu_softc *sc,
41 struct sunxi_ccu_clk *clk, const char *name)
42 {
43 struct sunxi_ccu_mux *mux = &clk->u.mux;
44 uint32_t val;
45 u_int index;
46
47 KASSERT(clk->type == SUNXI_CCU_MUX);
48
49 if (mux->sel == 0)
50 return ENODEV;
51
52 for (index = 0; index < mux->nparents; index++) {
53 if (mux->parents[index] != NULL &&
54 strcmp(mux->parents[index], name) == 0)
55 break;
56 }
57 if (index == mux->nparents)
58 return EINVAL;
59
60 val = CCU_READ(sc, mux->reg);
61 val &= ~mux->sel;
62 val |= __SHIFTIN(index, mux->sel);
63 CCU_WRITE(sc, mux->reg, val);
64
65 return 0;
66 }
67
68 const char *
sunxi_ccu_mux_get_parent(struct sunxi_ccu_softc * sc,struct sunxi_ccu_clk * clk)69 sunxi_ccu_mux_get_parent(struct sunxi_ccu_softc *sc,
70 struct sunxi_ccu_clk *clk)
71 {
72 struct sunxi_ccu_mux *mux = &clk->u.mux;
73 u_int index;
74 uint32_t val;
75
76 KASSERT(clk->type == SUNXI_CCU_MUX);
77
78 val = CCU_READ(sc, mux->reg);
79 index = __SHIFTOUT(val, mux->sel);
80
81 return mux->parents[index];
82 }
83