1 /*- 2 * Copyright (c) 2017 Emmanuel Vadot <manu@freebsd.org> 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 18 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 20 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 21 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/param.h> 27 #include <sys/systm.h> 28 #include <sys/bus.h> 29 30 #include <dev/clk/clk.h> 31 32 #include <dev/clk/allwinner/aw_clk.h> 33 #include <dev/clk/allwinner/aw_clk_prediv_mux.h> 34 35 #include "clkdev_if.h" 36 37 /* 38 * clknode for clocks matching the formula : 39 * 40 * clk = clkin / prediv / div 41 * 42 * and where prediv is conditional 43 * 44 */ 45 46 struct aw_clk_prediv_mux_sc { 47 uint32_t offset; 48 49 uint32_t mux_shift; 50 uint32_t mux_mask; 51 52 struct aw_clk_factor div; 53 struct aw_clk_factor prediv; 54 55 uint32_t flags; 56 }; 57 58 #define WRITE4(_clk, off, val) \ 59 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val) 60 #define READ4(_clk, off, val) \ 61 CLKDEV_READ_4(clknode_get_device(_clk), off, val) 62 #define MODIFY4(_clk, off, clr, set ) \ 63 CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set) 64 #define DEVICE_LOCK(_clk) \ 65 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) 66 #define DEVICE_UNLOCK(_clk) \ 67 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) 68 69 static int 70 aw_clk_prediv_mux_init(struct clknode *clk, device_t dev) 71 { 72 struct aw_clk_prediv_mux_sc *sc; 73 uint32_t val; 74 75 sc = clknode_get_softc(clk); 76 77 DEVICE_LOCK(clk); 78 READ4(clk, sc->offset, &val); 79 DEVICE_UNLOCK(clk); 80 81 /* Init the current parent */ 82 val = (val & sc->mux_mask) >> sc->mux_shift; 83 clknode_init_parent_idx(clk, val); 84 85 return (0); 86 } 87 88 static int 89 aw_clk_prediv_mux_set_mux(struct clknode *clk, int index) 90 { 91 struct aw_clk_prediv_mux_sc *sc; 92 uint32_t val; 93 94 sc = clknode_get_softc(clk); 95 96 DEVICE_LOCK(clk); 97 READ4(clk, sc->offset, &val); 98 val &= ~sc->mux_mask; 99 val |= index << sc->mux_shift; 100 WRITE4(clk, sc->offset, val); 101 DEVICE_UNLOCK(clk); 102 103 return (0); 104 } 105 106 static int 107 aw_clk_prediv_mux_recalc(struct clknode *clk, uint64_t *freq) 108 { 109 struct aw_clk_prediv_mux_sc *sc; 110 uint32_t val, div, prediv; 111 112 sc = clknode_get_softc(clk); 113 114 DEVICE_LOCK(clk); 115 READ4(clk, sc->offset, &val); 116 DEVICE_UNLOCK(clk); 117 118 div = aw_clk_get_factor(val, &sc->div); 119 prediv = aw_clk_get_factor(val, &sc->prediv); 120 121 *freq = *freq / prediv / div; 122 return (0); 123 } 124 125 static clknode_method_t aw_prediv_mux_clknode_methods[] = { 126 /* Device interface */ 127 CLKNODEMETHOD(clknode_init, aw_clk_prediv_mux_init), 128 CLKNODEMETHOD(clknode_set_mux, aw_clk_prediv_mux_set_mux), 129 CLKNODEMETHOD(clknode_recalc_freq, aw_clk_prediv_mux_recalc), 130 CLKNODEMETHOD_END 131 }; 132 133 DEFINE_CLASS_1(aw_prediv_mux_clknode, aw_prediv_mux_clknode_class, 134 aw_prediv_mux_clknode_methods, sizeof(struct aw_clk_prediv_mux_sc), 135 clknode_class); 136 137 int 138 aw_clk_prediv_mux_register(struct clkdom *clkdom, struct aw_clk_prediv_mux_def *clkdef) 139 { 140 struct clknode *clk; 141 struct aw_clk_prediv_mux_sc *sc; 142 143 clk = clknode_create(clkdom, &aw_prediv_mux_clknode_class, &clkdef->clkdef); 144 if (clk == NULL) 145 return (1); 146 147 sc = clknode_get_softc(clk); 148 149 sc->offset = clkdef->offset; 150 151 sc->mux_shift = clkdef->mux_shift; 152 sc->mux_mask = ((1 << clkdef->mux_width) - 1) << sc->mux_shift; 153 154 sc->div.shift = clkdef->div.shift; 155 sc->div.mask = ((1 << clkdef->div.width) - 1) << sc->div.shift; 156 sc->div.value = clkdef->div.value; 157 sc->div.cond_shift = clkdef->div.cond_shift; 158 sc->div.cond_mask = ((1 << clkdef->div.cond_width) - 1) << sc->div.shift; 159 sc->div.cond_value = clkdef->div.cond_value; 160 sc->div.flags = clkdef->div.flags; 161 162 sc->prediv.shift = clkdef->prediv.shift; 163 sc->prediv.mask = ((1 << clkdef->prediv.width) - 1) << sc->prediv.shift; 164 sc->prediv.value = clkdef->prediv.value; 165 sc->prediv.cond_shift = clkdef->prediv.cond_shift; 166 if (clkdef->prediv.cond_width != 0) 167 sc->prediv.cond_mask = ((1 << clkdef->prediv.cond_width) - 1) << sc->prediv.shift; 168 else 169 sc->prediv.cond_mask = clkdef->prediv.cond_mask; 170 sc->prediv.cond_value = clkdef->prediv.cond_value; 171 sc->prediv.flags = clkdef->prediv.flags; 172 173 sc->flags = clkdef->flags; 174 175 clknode_register(clkdom, clk); 176 177 return (0); 178 } 179