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      1 /* $NetBSD: meson_clk_gate.c,v 1.2 2019/02/25 19:30:17 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017-2019 Jared McNeill <jmcneill (at) 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: meson_clk_gate.c,v 1.2 2019/02/25 19:30:17 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/amlogic/meson_clk.h>
     38 
     39 int
     40 meson_clk_gate_enable(struct meson_clk_softc *sc, struct meson_clk_clk *clk,
     41     int enable)
     42 {
     43 	struct meson_clk_gate *gate = &clk->u.gate;
     44 	uint32_t val;
     45 	int set;
     46 
     47 	KASSERT(clk->type == MESON_CLK_GATE);
     48 
     49 	set = (gate->flags & MESON_CLK_GATE_SET_TO_DISABLE) ? !enable : enable;
     50 
     51 	CLK_LOCK(sc);
     52 
     53 	val = CLK_READ(sc, gate->reg);
     54 	if (set)
     55 		val |= gate->mask;
     56 	else
     57 		val &= ~gate->mask;
     58 	CLK_WRITE(sc, gate->reg, val);
     59 
     60 	CLK_UNLOCK(sc);
     61 
     62 	return 0;
     63 }
     64 
     65 const char *
     66 meson_clk_gate_get_parent(struct meson_clk_softc *sc, struct meson_clk_clk *clk)
     67 {
     68 	struct meson_clk_gate *gate = &clk->u.gate;
     69 
     70 	KASSERT(clk->type == MESON_CLK_GATE);
     71 
     72 	return gate->parent;
     73 }
     74