1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright 2016 Michal Meloun <mmel@FreeBSD.org> 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 AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, 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 #include <sys/param.h> 31 #include <sys/conf.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/systm.h> 35 36 #include <machine/bus.h> 37 38 #include <dev/extres/clk/clk.h> 39 40 #include <arm64/freescale/imx/clk/imx_clk_mux.h> 41 42 #include "clkdev_if.h" 43 44 #define WR4(_clk, off, val) \ 45 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val) 46 #define RD4(_clk, off, val) \ 47 CLKDEV_READ_4(clknode_get_device(_clk), off, val) 48 #define MD4(_clk, off, clr, set ) \ 49 CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set) 50 #define DEVICE_LOCK(_clk) \ 51 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) 52 #define DEVICE_UNLOCK(_clk) \ 53 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) 54 55 static int imx_clk_mux_init(struct clknode *clk, device_t dev); 56 static int imx_clk_mux_set_mux(struct clknode *clk, int idx); 57 58 struct imx_clk_mux_sc { 59 uint32_t offset; 60 uint32_t shift; 61 uint32_t mask; 62 int mux_flags; 63 }; 64 65 static clknode_method_t imx_clk_mux_methods[] = { 66 /* Device interface */ 67 CLKNODEMETHOD(clknode_init, imx_clk_mux_init), 68 CLKNODEMETHOD(clknode_set_mux, imx_clk_mux_set_mux), 69 CLKNODEMETHOD_END 70 }; 71 DEFINE_CLASS_1(imx_clk_mux, imx_clk_mux_class, imx_clk_mux_methods, 72 sizeof(struct imx_clk_mux_sc), clknode_class); 73 74 static int 75 imx_clk_mux_init(struct clknode *clk, device_t dev) 76 { 77 uint32_t reg; 78 struct imx_clk_mux_sc *sc; 79 int rv; 80 81 sc = clknode_get_softc(clk); 82 83 DEVICE_LOCK(clk); 84 rv = RD4(clk, sc->offset, ®); 85 DEVICE_UNLOCK(clk); 86 if (rv != 0) { 87 return (rv); 88 } 89 reg = (reg >> sc->shift) & sc->mask; 90 clknode_init_parent_idx(clk, reg); 91 return(0); 92 } 93 94 static int 95 imx_clk_mux_set_mux(struct clknode *clk, int idx) 96 { 97 uint32_t reg; 98 struct imx_clk_mux_sc *sc; 99 int rv; 100 101 sc = clknode_get_softc(clk); 102 103 DEVICE_LOCK(clk); 104 rv = MD4(clk, sc->offset, sc->mask << sc->shift, 105 ((idx & sc->mask) << sc->shift)); 106 if (rv != 0) { 107 DEVICE_UNLOCK(clk); 108 return (rv); 109 } 110 RD4(clk, sc->offset, ®); 111 DEVICE_UNLOCK(clk); 112 113 return(0); 114 } 115 116 int 117 imx_clk_mux_register(struct clkdom *clkdom, struct imx_clk_mux_def *clkdef) 118 { 119 struct clknode *clk; 120 struct imx_clk_mux_sc *sc; 121 122 clk = clknode_create(clkdom, &imx_clk_mux_class, &clkdef->clkdef); 123 if (clk == NULL) 124 return (1); 125 126 sc = clknode_get_softc(clk); 127 sc->offset = clkdef->offset; 128 sc->shift = clkdef->shift; 129 sc->mask = (1 << clkdef->width) - 1; 130 sc->mux_flags = clkdef->mux_flags; 131 132 clknode_register(clkdom, clk); 133 return (0); 134 } 135