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/param.h> 30 #include <sys/conf.h> 31 #include <sys/bus.h> 32 #include <sys/kernel.h> 33 #include <sys/systm.h> 34 35 #include <machine/bus.h> 36 37 #include <dev/clk/clk.h> 38 39 #include <arm64/freescale/imx/clk/imx_clk_mux.h> 40 41 #include "clkdev_if.h" 42 43 #define WR4(_clk, off, val) \ 44 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val) 45 #define RD4(_clk, off, val) \ 46 CLKDEV_READ_4(clknode_get_device(_clk), off, val) 47 #define MD4(_clk, off, clr, set ) \ 48 CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set) 49 #define DEVICE_LOCK(_clk) \ 50 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) 51 #define DEVICE_UNLOCK(_clk) \ 52 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) 53 54 static int imx_clk_mux_init(struct clknode *clk, device_t dev); 55 static int imx_clk_mux_set_mux(struct clknode *clk, int idx); 56 57 struct imx_clk_mux_sc { 58 uint32_t offset; 59 uint32_t shift; 60 uint32_t mask; 61 int mux_flags; 62 }; 63 64 static clknode_method_t imx_clk_mux_methods[] = { 65 /* Device interface */ 66 CLKNODEMETHOD(clknode_init, imx_clk_mux_init), 67 CLKNODEMETHOD(clknode_set_mux, imx_clk_mux_set_mux), 68 CLKNODEMETHOD_END 69 }; 70 DEFINE_CLASS_1(imx_clk_mux, imx_clk_mux_class, imx_clk_mux_methods, 71 sizeof(struct imx_clk_mux_sc), clknode_class); 72 73 static int 74 imx_clk_mux_init(struct clknode *clk, device_t dev) 75 { 76 uint32_t reg; 77 struct imx_clk_mux_sc *sc; 78 int rv; 79 80 sc = clknode_get_softc(clk); 81 82 DEVICE_LOCK(clk); 83 rv = RD4(clk, sc->offset, ®); 84 DEVICE_UNLOCK(clk); 85 if (rv != 0) { 86 return (rv); 87 } 88 reg = (reg >> sc->shift) & sc->mask; 89 clknode_init_parent_idx(clk, reg); 90 return(0); 91 } 92 93 static int 94 imx_clk_mux_set_mux(struct clknode *clk, int idx) 95 { 96 uint32_t reg; 97 struct imx_clk_mux_sc *sc; 98 int rv; 99 100 sc = clknode_get_softc(clk); 101 102 DEVICE_LOCK(clk); 103 rv = MD4(clk, sc->offset, sc->mask << sc->shift, 104 ((idx & sc->mask) << sc->shift)); 105 if (rv != 0) { 106 DEVICE_UNLOCK(clk); 107 return (rv); 108 } 109 RD4(clk, sc->offset, ®); 110 DEVICE_UNLOCK(clk); 111 112 return(0); 113 } 114 115 int 116 imx_clk_mux_register(struct clkdom *clkdom, struct imx_clk_mux_def *clkdef) 117 { 118 struct clknode *clk; 119 struct imx_clk_mux_sc *sc; 120 121 clk = clknode_create(clkdom, &imx_clk_mux_class, &clkdef->clkdef); 122 if (clk == NULL) 123 return (1); 124 125 sc = clknode_get_softc(clk); 126 sc->offset = clkdef->offset; 127 sc->shift = clkdef->shift; 128 sc->mask = (1 << clkdef->width) - 1; 129 sc->mux_flags = clkdef->mux_flags; 130 131 clknode_register(clkdom, clk); 132 return (0); 133 } 134