xref: /netbsd-src/sys/arch/arm/rockchip/rk_cru_gate.c (revision 62d94959b408c2a3c62171bb182d06a053973ef9)
1 /* $NetBSD: rk_cru_gate.c,v 1.2 2018/06/17 14:48:15 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_gate.c,v 1.2 2018/06/17 14:48:15 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 int
rk_cru_gate_enable(struct rk_cru_softc * sc,struct rk_cru_clk * clk,int enable)40 rk_cru_gate_enable(struct rk_cru_softc *sc, struct rk_cru_clk *clk,
41     int enable)
42 {
43 	struct rk_cru_gate *gate = &clk->u.gate;
44 
45 	KASSERT(clk->type == RK_CRU_GATE);
46 
47 	const uint32_t write_mask = gate->mask << 16;
48 	const uint32_t write_val = enable ? 0 : gate->mask;
49 
50 	CRU_WRITE(sc, gate->reg, write_mask | write_val);
51 
52 	return 0;
53 }
54 
55 const char *
rk_cru_gate_get_parent(struct rk_cru_softc * sc,struct rk_cru_clk * clk)56 rk_cru_gate_get_parent(struct rk_cru_softc *sc,
57     struct rk_cru_clk *clk)
58 {
59 	struct rk_cru_gate *gate = &clk->u.gate;
60 
61 	KASSERT(clk->type == RK_CRU_GATE);
62 
63 	return gate->parent;
64 }
65