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@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