Home | History | Annotate | Line # | Download | only in rockchip 
      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 (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: 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
     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 *
     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