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rk_cru_mux.c revision 1.1 
      1 /* $NetBSD: rk_cru_mux.c,v 1.1 2018/06/16 00:19:04 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_mux.c,v 1.1 2018/06/16 00:19:04 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 const char *
     40 rk_cru_mux_get_parent(struct rk_cru_softc *sc,
     41     struct rk_cru_clk *clk)
     42 {
     43 	struct rk_cru_mux *mux = &clk->u.mux;
     44 	const bool mux_grf = (mux->flags & RK_MUX_GRF) != 0;
     45 
     46 	KASSERT(clk->type == RK_CRU_MUX);
     47 
     48 	if (mux_grf && !HAS_GRF(sc))
     49 		return NULL;
     50 
     51 	const uint32_t val = mux_grf ? GRF_READ(sc, mux->reg) : CRU_READ(sc, mux->reg);
     52 	const u_int index = __SHIFTOUT(val, mux->mask);
     53 
     54 	return mux->parents[index];
     55 }
     56 
     57 int
     58 rk_cru_mux_set_parent(struct rk_cru_softc *sc,
     59     struct rk_cru_clk *clk, const char *parent)
     60 {
     61 	struct rk_cru_mux *mux = &clk->u.mux;
     62 	const bool mux_grf = (mux->flags & RK_MUX_GRF) != 0;
     63 
     64 	KASSERT(clk->type == RK_CRU_MUX);
     65 
     66 	if (mux_grf && !HAS_GRF(sc))
     67 		return ENXIO;
     68 
     69 	for (u_int index = 0; index < mux->nparents; index++) {
     70 		if (strcmp(mux->parents[index], parent) == 0) {
     71 			const uint32_t write_mask = mux->mask << 16;
     72 			const uint32_t write_val = __SHIFTIN(index, mux->mask);
     73 
     74 			if (mux_grf)
     75 				GRF_WRITE(sc, mux->reg, write_mask | write_val);
     76 			else
     77 				CRU_WRITE(sc, mux->reg, write_mask | write_val);
     78 
     79 			return 0;
     80 		}
     81 	}
     82 
     83 	return EINVAL;
     84 }
     85