1 /*- 2 * Copyright (c) 2021 Adrian Chadd <adrian@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 AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, 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/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/lock.h> 33 #include <sys/mutex.h> 34 #include <sys/rman.h> 35 #include <machine/bus.h> 36 37 #include <dev/extres/clk/clk.h> 38 #include <dev/extres/clk/clk_div.h> 39 #include <dev/extres/clk/clk_fixed.h> 40 #include <dev/extres/clk/clk_mux.h> 41 42 #include "qcom_clk_ro_div.h" 43 44 #include "clkdev_if.h" 45 46 #if 0 47 #define DPRINTF(dev, msg...) device_printf(dev, "cpufreq_dt: " msg); 48 #else 49 #define DPRINTF(dev, msg...) 50 #endif 51 52 /* 53 * This is a read-only divisor table node. 54 * It represents some divisor that is setup by the boot environment 55 * and we don't have any need for the driver to go and fiddle with. 56 * 57 * It likely should just live in the extres/clk code. 58 */ 59 60 struct qcom_clk_ro_div_sc { 61 struct clknode *clknode; 62 uint32_t offset; 63 uint32_t shift; 64 uint32_t width; 65 struct qcom_clk_ro_div_tbl *div_tbl; 66 }; 67 68 static int 69 qcom_clk_ro_div_recalc(struct clknode *clk, uint64_t *freq) 70 { 71 struct qcom_clk_ro_div_sc *sc; 72 uint32_t reg, idx, div = 1; 73 int i; 74 75 sc = clknode_get_softc(clk); 76 77 if (freq == NULL || *freq == 0) { 78 printf("%s: called; NULL or 0 frequency\n", __func__); 79 return (ENXIO); 80 } 81 82 CLKDEV_DEVICE_LOCK(clknode_get_device(sc->clknode)); 83 CLKDEV_READ_4(clknode_get_device(sc->clknode), sc->offset, ®); 84 CLKDEV_DEVICE_UNLOCK(clknode_get_device(sc->clknode)); 85 86 idx = (reg >> sc->shift) & ((1U << sc->width) - 1); 87 88 for (i = 0; (sc->div_tbl[i].div != 0); i++) { 89 if (idx == sc->div_tbl[i].val) { 90 div = sc->div_tbl[i].div; 91 break; 92 } 93 } 94 95 DPRINTF(clknode_get_device(sc->clknode), 96 "%s: freq=%llu, idx=%u, div=%u, out_freq=%llu\n", 97 __func__, 98 *freq, 99 idx, 100 div, 101 *freq / div); 102 103 *freq = *freq / div; 104 return (0); 105 } 106 107 static int 108 qcom_clk_ro_div_init(struct clknode *clk, device_t dev) 109 { 110 111 /* 112 * There's only a single parent here for this divisor, 113 * so just set it to 0; the caller doesn't need to supply it. 114 */ 115 clknode_init_parent_idx(clk, 0); 116 117 return (0); 118 } 119 120 static clknode_method_t qcom_clk_ro_div_methods[] = { 121 /* Device interface */ 122 CLKNODEMETHOD(clknode_init, qcom_clk_ro_div_init), 123 CLKNODEMETHOD(clknode_recalc_freq, qcom_clk_ro_div_recalc), 124 CLKNODEMETHOD_END 125 }; 126 127 DEFINE_CLASS_1(qcom_clk_fepll, qcom_clk_ro_div_class, 128 qcom_clk_ro_div_methods, sizeof(struct qcom_clk_ro_div_sc), 129 clknode_class); 130 131 int 132 qcom_clk_ro_div_register(struct clkdom *clkdom, 133 struct qcom_clk_ro_div_def *clkdef) 134 { 135 struct clknode *clk; 136 struct qcom_clk_ro_div_sc *sc; 137 138 clk = clknode_create(clkdom, &qcom_clk_ro_div_class, 139 &clkdef->clkdef); 140 if (clk == NULL) 141 return (1); 142 143 sc = clknode_get_softc(clk); 144 sc->clknode = clk; 145 sc->offset = clkdef->offset; 146 sc->shift = clkdef->shift; 147 sc->width = clkdef->width; 148 sc->div_tbl = clkdef->div_tbl; 149 150 clknode_register(clkdom, clk); 151 152 return (0); 153 } 154