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 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/conf.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/systm.h> 37 38 #include <machine/bus.h> 39 40 #include <dev/extres/clk/clk.h> 41 42 #include <arm64/freescale/imx/clk/imx_clk_mux.h> 43 44 #include "clkdev_if.h" 45 46 #define WR4(_clk, off, val) \ 47 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val) 48 #define RD4(_clk, off, val) \ 49 CLKDEV_READ_4(clknode_get_device(_clk), off, val) 50 #define MD4(_clk, off, clr, set ) \ 51 CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set) 52 #define DEVICE_LOCK(_clk) \ 53 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) 54 #define DEVICE_UNLOCK(_clk) \ 55 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) 56 57 static int imx_clk_mux_init(struct clknode *clk, device_t dev); 58 static int imx_clk_mux_set_mux(struct clknode *clk, int idx); 59 60 struct imx_clk_mux_sc { 61 uint32_t offset; 62 uint32_t shift; 63 uint32_t mask; 64 int mux_flags; 65 }; 66 67 static clknode_method_t imx_clk_mux_methods[] = { 68 /* Device interface */ 69 CLKNODEMETHOD(clknode_init, imx_clk_mux_init), 70 CLKNODEMETHOD(clknode_set_mux, imx_clk_mux_set_mux), 71 CLKNODEMETHOD_END 72 }; 73 DEFINE_CLASS_1(imx_clk_mux, imx_clk_mux_class, imx_clk_mux_methods, 74 sizeof(struct imx_clk_mux_sc), clknode_class); 75 76 static int 77 imx_clk_mux_init(struct clknode *clk, device_t dev) 78 { 79 uint32_t reg; 80 struct imx_clk_mux_sc *sc; 81 int rv; 82 83 sc = clknode_get_softc(clk); 84 85 DEVICE_LOCK(clk); 86 rv = RD4(clk, sc->offset, ®); 87 DEVICE_UNLOCK(clk); 88 if (rv != 0) { 89 return (rv); 90 } 91 reg = (reg >> sc->shift) & sc->mask; 92 clknode_init_parent_idx(clk, reg); 93 return(0); 94 } 95 96 static int 97 imx_clk_mux_set_mux(struct clknode *clk, int idx) 98 { 99 uint32_t reg; 100 struct imx_clk_mux_sc *sc; 101 int rv; 102 103 sc = clknode_get_softc(clk); 104 105 DEVICE_LOCK(clk); 106 rv = MD4(clk, sc->offset, sc->mask << sc->shift, 107 ((idx & sc->mask) << sc->shift)); 108 if (rv != 0) { 109 DEVICE_UNLOCK(clk); 110 return (rv); 111 } 112 RD4(clk, sc->offset, ®); 113 DEVICE_UNLOCK(clk); 114 115 return(0); 116 } 117 118 int 119 imx_clk_mux_register(struct clkdom *clkdom, struct imx_clk_mux_def *clkdef) 120 { 121 struct clknode *clk; 122 struct imx_clk_mux_sc *sc; 123 124 clk = clknode_create(clkdom, &imx_clk_mux_class, &clkdef->clkdef); 125 if (clk == NULL) 126 return (1); 127 128 sc = clknode_get_softc(clk); 129 sc->offset = clkdef->offset; 130 sc->shift = clkdef->shift; 131 sc->mask = (1 << clkdef->width) - 1; 132 sc->mux_flags = clkdef->mux_flags; 133 134 clknode_register(clkdom, clk); 135 return (0); 136 } 137