1/*- 2 * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca> 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 ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 22 * 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 * $FreeBSD$ 27 */ 28 29/* 30 * Allwinner oscillator clock 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD$"); 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/bus.h> 39#include <sys/rman.h> 40#include <sys/kernel.h> 41#include <sys/module.h> 42 43#include <dev/ofw/ofw_bus.h> 44#include <dev/ofw/ofw_bus_subr.h> 45 46#include <dev/extres/clk/clk_fixed.h> 47 48static int 49aw_oscclk_probe(device_t dev) 50{ 51 if (!ofw_bus_status_okay(dev)) 52 return (ENXIO); 53 54 if (!ofw_bus_is_compatible(dev, "allwinner,sun4i-a10-osc-clk")) 55 return (ENXIO); 56 57 device_set_desc(dev, "Allwinner Oscillator Clock"); 58 return (BUS_PROBE_DEFAULT); 59} 60 61static int 62aw_oscclk_attach(device_t dev) 63{ 64 struct clk_fixed_def def; 65 struct clkdom *clkdom; 66 phandle_t node; 67 uint32_t freq; 68 int error; 69 70 node = ofw_bus_get_node(dev); 71 72 if (OF_getencprop(node, "clock-frequency", &freq, sizeof(freq)) <= 0) { 73 device_printf(dev, "missing clock-frequency property\n"); 74 error = ENXIO; 75 goto fail; 76 } 77 78 clkdom = clkdom_create(dev); 79 80 memset(&def, 0, sizeof(def)); 81 def.clkdef.id = 1; 82 def.freq = freq; 83 error = clk_parse_ofw_clk_name(dev, node, &def.clkdef.name); 84 if (error != 0) { 85 device_printf(dev, "cannot parse clock name\n"); 86 error = ENXIO; 87 goto fail; 88 } 89 90 error = clknode_fixed_register(clkdom, &def); 91 if (error != 0) { 92 device_printf(dev, "cannot register fixed clock\n"); 93 error = ENXIO; 94 goto fail; 95 } 96 97 if (clkdom_finit(clkdom) != 0) { 98 device_printf(dev, "cannot finalize clkdom initialization\n"); 99 error = ENXIO; 100 goto fail; 101 } 102 103 if (bootverbose) 104 clkdom_dump(clkdom); 105 106 OF_prop_free(__DECONST(char *, def.clkdef.name)); 107 108 return (0); 109 110fail: 111 OF_prop_free(__DECONST(char *, def.clkdef.name)); 112 return (error); 113} 114 115static device_method_t aw_oscclk_methods[] = { 116 /* Device interface */ 117 DEVMETHOD(device_probe, aw_oscclk_probe), 118 DEVMETHOD(device_attach, aw_oscclk_attach), 119 120 DEVMETHOD_END 121}; 122 123static driver_t aw_oscclk_driver = { 124 "aw_oscclk", 125 aw_oscclk_methods, 126 0, 127}; 128 129static devclass_t aw_oscclk_devclass; 130 131EARLY_DRIVER_MODULE(aw_oscclk, simplebus, aw_oscclk_driver, 132 aw_oscclk_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 133