1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 33 #include <sys/param.h> 34 #include <sys/conf.h> 35 #include <sys/bus.h> 36 #include <sys/kernel.h> 37 #include <sys/systm.h> 38 39 #include <machine/bus.h> 40 41 #include <dev/extres/clk/clk.h> 42 43 #include <arm64/freescale/imx/clk/imx_clk_mux.h> 44 45 #include "clkdev_if.h" 46 47 #define WR4(_clk, off, val) \ 48 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val) 49 #define RD4(_clk, off, val) \ 50 CLKDEV_READ_4(clknode_get_device(_clk), off, val) 51 #define MD4(_clk, off, clr, set ) \ 52 CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set) 53 #define DEVICE_LOCK(_clk) \ 54 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) 55 #define DEVICE_UNLOCK(_clk) \ 56 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) 57 58 static int imx_clk_mux_init(struct clknode *clk, device_t dev); 59 static int imx_clk_mux_set_mux(struct clknode *clk, int idx); 60 61 struct imx_clk_mux_sc { 62 uint32_t offset; 63 uint32_t shift; 64 uint32_t mask; 65 int mux_flags; 66 }; 67 68 static clknode_method_t imx_clk_mux_methods[] = { 69 /* Device interface */ 70 CLKNODEMETHOD(clknode_init, imx_clk_mux_init), 71 CLKNODEMETHOD(clknode_set_mux, imx_clk_mux_set_mux), 72 CLKNODEMETHOD_END 73 }; 74 DEFINE_CLASS_1(imx_clk_mux, imx_clk_mux_class, imx_clk_mux_methods, 75 sizeof(struct imx_clk_mux_sc), clknode_class); 76 77 78 static int 79 imx_clk_mux_init(struct clknode *clk, device_t dev) 80 { 81 uint32_t reg; 82 struct imx_clk_mux_sc *sc; 83 int rv; 84 85 sc = clknode_get_softc(clk); 86 87 DEVICE_LOCK(clk); 88 rv = RD4(clk, sc->offset, ®); 89 DEVICE_UNLOCK(clk); 90 if (rv != 0) { 91 return (rv); 92 } 93 reg = (reg >> sc->shift) & sc->mask; 94 clknode_init_parent_idx(clk, reg); 95 return(0); 96 } 97 98 static int 99 imx_clk_mux_set_mux(struct clknode *clk, int idx) 100 { 101 uint32_t reg; 102 struct imx_clk_mux_sc *sc; 103 int rv; 104 105 sc = clknode_get_softc(clk); 106 107 DEVICE_LOCK(clk); 108 rv = MD4(clk, sc->offset, sc->mask << sc->shift, 109 ((idx & sc->mask) << sc->shift)); 110 if (rv != 0) { 111 DEVICE_UNLOCK(clk); 112 return (rv); 113 } 114 RD4(clk, sc->offset, ®); 115 DEVICE_UNLOCK(clk); 116 117 return(0); 118 } 119 120 int 121 imx_clk_mux_register(struct clkdom *clkdom, struct imx_clk_mux_def *clkdef) 122 { 123 struct clknode *clk; 124 struct imx_clk_mux_sc *sc; 125 126 clk = clknode_create(clkdom, &imx_clk_mux_class, &clkdef->clkdef); 127 if (clk == NULL) 128 return (1); 129 130 sc = clknode_get_softc(clk); 131 sc->offset = clkdef->offset; 132 sc->shift = clkdef->shift; 133 sc->mask = (1 << clkdef->width) - 1; 134 sc->mux_flags = clkdef->mux_flags; 135 136 clknode_register(clkdom, clk); 137 return (0); 138 } 139