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/param.h> 27 #include <sys/systm.h> 28 #include <sys/bus.h> 29 #include <sys/lock.h> 30 #include <sys/mutex.h> 31 #include <sys/rman.h> 32 #include <machine/bus.h> 33 34 #include <dev/extres/clk/clk.h> 35 #include <dev/extres/clk/clk_div.h> 36 #include <dev/extres/clk/clk_fixed.h> 37 #include <dev/extres/clk/clk_mux.h> 38 39 #include "qcom_clk_fdiv.h" 40 41 #include "clkdev_if.h" 42 43 /* 44 * This is a fixed divisor node. It represents some divisor 45 * that is setup by the boot environment and we don't have 46 * any need for the driver to go and fiddle with. 47 * 48 * It likely should just live in the extres/clk code. 49 */ 50 51 struct qcom_clk_fdiv_sc { 52 struct clknode *clknode; 53 uint32_t divisor; 54 }; 55 56 static int 57 qcom_clk_fdiv_recalc(struct clknode *clk, uint64_t *freq) 58 { 59 struct qcom_clk_fdiv_sc *sc; 60 61 sc = clknode_get_softc(clk); 62 63 if (freq == NULL || *freq == 0) { 64 printf("%s: called; NULL or 0 frequency\n", __func__); 65 return (ENXIO); 66 } 67 68 *freq = *freq / sc->divisor; 69 return (0); 70 } 71 72 static int 73 qcom_clk_fdiv_init(struct clknode *clk, device_t dev) 74 { 75 /* 76 * There's only a single parent here for an fixed divisor, 77 * so just set it to 0; the caller doesn't need to supply it. 78 */ 79 clknode_init_parent_idx(clk, 0); 80 81 return(0); 82 } 83 84 static clknode_method_t qcom_clk_fdiv_methods[] = { 85 /* Device interface */ 86 CLKNODEMETHOD(clknode_init, qcom_clk_fdiv_init), 87 CLKNODEMETHOD(clknode_recalc_freq, qcom_clk_fdiv_recalc), 88 CLKNODEMETHOD_END 89 }; 90 91 DEFINE_CLASS_1(qcom_clk_fepll, qcom_clk_fdiv_class, qcom_clk_fdiv_methods, 92 sizeof(struct qcom_clk_fdiv_sc), clknode_class); 93 94 int 95 qcom_clk_fdiv_register(struct clkdom *clkdom, struct qcom_clk_fdiv_def *clkdef) 96 { 97 struct clknode *clk; 98 struct qcom_clk_fdiv_sc *sc; 99 100 clk = clknode_create(clkdom, &qcom_clk_fdiv_class, &clkdef->clkdef); 101 if (clk == NULL) 102 return (1); 103 104 sc = clknode_get_softc(clk); 105 sc->clknode = clk; 106 107 sc->divisor = clkdef->divisor; 108 109 clknode_register(clkdom, clk); 110 111 return (0); 112 } 113