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@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