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      1 /* $NetBSD: sunxi_ccu_mux.c,v 1.1 2021/11/07 17:13:12 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2021 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: sunxi_ccu_mux.c,v 1.1 2021/11/07 17:13:12 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/sunxi/sunxi_ccu.h>
     38 
     39 int
     40 sunxi_ccu_mux_set_parent(struct sunxi_ccu_softc *sc,
     41     struct sunxi_ccu_clk *clk, const char *name)
     42 {
     43 	struct sunxi_ccu_mux *mux = &clk->u.mux;
     44 	uint32_t val;
     45 	u_int index;
     46 
     47 	KASSERT(clk->type == SUNXI_CCU_MUX);
     48 
     49 	if (mux->sel == 0)
     50 		return ENODEV;
     51 
     52 	for (index = 0; index < mux->nparents; index++) {
     53 		if (mux->parents[index] != NULL &&
     54 		    strcmp(mux->parents[index], name) == 0)
     55 			break;
     56 	}
     57 	if (index == mux->nparents)
     58 		return EINVAL;
     59 
     60 	val = CCU_READ(sc, mux->reg);
     61 	val &= ~mux->sel;
     62 	val |= __SHIFTIN(index, mux->sel);
     63 	CCU_WRITE(sc, mux->reg, val);
     64 
     65 	return 0;
     66 }
     67 
     68 const char *
     69 sunxi_ccu_mux_get_parent(struct sunxi_ccu_softc *sc,
     70     struct sunxi_ccu_clk *clk)
     71 {
     72 	struct sunxi_ccu_mux *mux = &clk->u.mux;
     73 	u_int index;
     74 	uint32_t val;
     75 
     76 	KASSERT(clk->type == SUNXI_CCU_MUX);
     77 
     78 	val = CCU_READ(sc, mux->reg);
     79 	index = __SHIFTOUT(val, mux->sel);
     80 
     81 	return mux->parents[index];
     82 }
     83