1 /* $NetBSD: rk_cru_mux.c,v 1.2 2018/06/30 17:54:07 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2018 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: rk_cru_mux.c,v 1.2 2018/06/30 17:54:07 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/rockchip/rk_cru.h>
38
39 const char *
rk_cru_mux_get_parent(struct rk_cru_softc * sc,struct rk_cru_clk * clk)40 rk_cru_mux_get_parent(struct rk_cru_softc *sc,
41 struct rk_cru_clk *clk)
42 {
43 struct rk_cru_mux *mux = &clk->u.mux;
44 const bool mux_grf = (mux->flags & RK_MUX_GRF) != 0;
45 uint32_t val;
46
47 KASSERT(clk->type == RK_CRU_MUX);
48
49 if (mux_grf) {
50 if (!HAS_GRF(sc))
51 return NULL;
52 syscon_lock(sc->sc_grf);
53 val = syscon_read_4(sc->sc_grf, mux->reg);
54 syscon_unlock(sc->sc_grf);
55 } else {
56 val = CRU_READ(sc, mux->reg);
57 }
58 const u_int index = __SHIFTOUT(val, mux->mask);
59
60 return mux->parents[index];
61 }
62
63 int
rk_cru_mux_set_parent(struct rk_cru_softc * sc,struct rk_cru_clk * clk,const char * parent)64 rk_cru_mux_set_parent(struct rk_cru_softc *sc,
65 struct rk_cru_clk *clk, const char *parent)
66 {
67 struct rk_cru_mux *mux = &clk->u.mux;
68 const bool mux_grf = (mux->flags & RK_MUX_GRF) != 0;
69
70 KASSERT(clk->type == RK_CRU_MUX);
71
72 if (mux_grf && !HAS_GRF(sc))
73 return ENXIO;
74
75 for (u_int index = 0; index < mux->nparents; index++) {
76 if (strcmp(mux->parents[index], parent) == 0) {
77 const uint32_t write_mask = mux->mask << 16;
78 const uint32_t write_val = __SHIFTIN(index, mux->mask);
79
80 if (mux_grf) {
81 syscon_lock(sc->sc_grf);
82 syscon_write_4(sc->sc_grf, mux->reg, write_mask | write_val);
83 syscon_unlock(sc->sc_grf);
84 } else
85 CRU_WRITE(sc, mux->reg, write_mask | write_val);
86
87 return 0;
88 }
89 }
90
91 return EINVAL;
92 }
93