1 /*- 2 * Copyright 2016 Michal Meloun <mmel@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/conf.h> 29 #include <sys/bus.h> 30 #include <sys/kernel.h> 31 #include <sys/systm.h> 32 33 #include <machine/bus.h> 34 35 #include <dev/clk/clk_mux.h> 36 37 #include "clkdev_if.h" 38 39 #define WR4(_clk, off, val) \ 40 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val) 41 #define RD4(_clk, off, val) \ 42 CLKDEV_READ_4(clknode_get_device(_clk), off, val) 43 #define MD4(_clk, off, clr, set ) \ 44 CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set) 45 #define DEVICE_LOCK(_clk) \ 46 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) 47 #define DEVICE_UNLOCK(_clk) \ 48 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) 49 50 static int clknode_mux_init(struct clknode *clk, device_t dev); 51 static int clknode_mux_set_mux(struct clknode *clk, int idx); 52 53 struct clknode_mux_sc { 54 uint32_t offset; 55 uint32_t shift; 56 uint32_t mask; 57 int mux_flags; 58 }; 59 60 static clknode_method_t clknode_mux_methods[] = { 61 /* Device interface */ 62 CLKNODEMETHOD(clknode_init, clknode_mux_init), 63 CLKNODEMETHOD(clknode_set_mux, clknode_mux_set_mux), 64 CLKNODEMETHOD_END 65 }; 66 DEFINE_CLASS_1(clknode_mux, clknode_mux_class, clknode_mux_methods, 67 sizeof(struct clknode_mux_sc), clknode_class); 68 69 70 static int 71 clknode_mux_init(struct clknode *clk, device_t dev) 72 { 73 uint32_t reg; 74 struct clknode_mux_sc *sc; 75 int rv; 76 77 sc = clknode_get_softc(clk); 78 79 DEVICE_LOCK(clk); 80 rv = RD4(clk, sc->offset, ®); 81 DEVICE_UNLOCK(clk); 82 if (rv != 0) { 83 return (rv); 84 } 85 reg = (reg >> sc->shift) & sc->mask; 86 clknode_init_parent_idx(clk, reg); 87 return(0); 88 } 89 90 static int 91 clknode_mux_set_mux(struct clknode *clk, int idx) 92 { 93 uint32_t reg; 94 struct clknode_mux_sc *sc; 95 int rv; 96 97 sc = clknode_get_softc(clk); 98 99 DEVICE_LOCK(clk); 100 rv = MD4(clk, sc->offset, sc->mask << sc->shift, 101 (idx & sc->mask) << sc->shift); 102 if (rv != 0) { 103 DEVICE_UNLOCK(clk); 104 return (rv); 105 } 106 RD4(clk, sc->offset, ®); 107 DEVICE_UNLOCK(clk); 108 109 return(0); 110 } 111 112 int 113 clknode_mux_register(struct clkdom *clkdom, struct clk_mux_def *clkdef) 114 { 115 struct clknode *clk; 116 struct clknode_mux_sc *sc; 117 118 clk = clknode_create(clkdom, &clknode_mux_class, &clkdef->clkdef); 119 if (clk == NULL) 120 return (1); 121 122 sc = clknode_get_softc(clk); 123 sc->offset = clkdef->offset; 124 sc->shift = clkdef->shift; 125 sc->mask = (1 << clkdef->width) - 1; 126 sc->mux_flags = clkdef->mux_flags; 127 128 clknode_register(clkdom, clk); 129 return (0); 130 } 131