1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2021 Semihalf. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/mutex.h> 36 #include <sys/rman.h> 37 #include <machine/bus.h> 38 39 #include <dev/fdt/simplebus.h> 40 41 #include <dev/extres/clk/clk.h> 42 #include <dev/extres/clk/clk_fixed.h> 43 #include <dev/extres/syscon/syscon.h> 44 45 #include <dev/ofw/ofw_bus.h> 46 #include <dev/ofw/ofw_bus_subr.h> 47 48 #include "syscon_if.h" 49 50 #define BIT(x) (1 << (x)) 51 52 #define NB_GPIO1_PIN_LT_L 0x8 53 #define NB_GPIO1_MPP1_9 BIT(9) 54 55 struct a37x0_xtal_softc { 56 device_t dev; 57 struct clkdom *clkdom; 58 }; 59 60 static int a37x0_xtal_attach(device_t dev); 61 static int a37x0_xtal_detach(device_t dev); 62 static int a37x0_xtal_probe(device_t dev); 63 64 static device_method_t a37x0_xtal_methods [] = { 65 DEVMETHOD(device_probe, a37x0_xtal_probe), 66 DEVMETHOD(device_attach, a37x0_xtal_attach), 67 DEVMETHOD(device_detach, a37x0_xtal_detach), 68 DEVMETHOD_END 69 }; 70 71 static driver_t a37x0_xtal_driver = { 72 "a37x0-xtal", 73 a37x0_xtal_methods, 74 sizeof(struct a37x0_xtal_softc) 75 }; 76 77 EARLY_DRIVER_MODULE(a37x0_xtal, simplebus, a37x0_xtal_driver, 0, 0, 78 BUS_PASS_TIMER + BUS_PASS_ORDER_EARLY); 79 80 static int 81 a37x0_xtal_attach(device_t dev) 82 { 83 struct a37x0_xtal_softc *sc; 84 struct clk_fixed_def def; 85 struct syscon *syscon; 86 uint32_t reg; 87 int error; 88 89 sc = device_get_softc(dev); 90 91 def.clkdef.name = "armada-3700-xtal"; 92 def.clkdef.parent_names = NULL; 93 def.clkdef.parent_cnt = 0; 94 def.clkdef.id = 1; 95 def.mult = 0; 96 def.div = 0; 97 98 if (SYSCON_GET_HANDLE(dev, &syscon) != 0 || syscon == NULL){ 99 device_printf(dev, "Cannot get syscon driver handle\n"); 100 return (ENXIO); 101 } 102 103 reg = SYSCON_READ_4(syscon, NB_GPIO1_PIN_LT_L); 104 if (reg & NB_GPIO1_MPP1_9) 105 def.freq = 40000000; 106 else 107 def.freq = 25000000; 108 109 sc->clkdom = clkdom_create(dev); 110 error = clknode_fixed_register(sc->clkdom, &def); 111 if (error){ 112 device_printf(dev, "Cannot register clock node\n"); 113 return (ENXIO); 114 } 115 116 error = clkdom_finit(sc->clkdom); 117 if (error){ 118 device_printf(dev, "Cannot finalize clock domain initialization\n"); 119 return (ENXIO); 120 } 121 122 if (bootverbose) 123 clkdom_dump(sc->clkdom); 124 125 return (0); 126 } 127 128 static int 129 a37x0_xtal_probe(device_t dev) 130 { 131 132 if (!ofw_bus_status_okay(dev)) 133 return (ENXIO); 134 135 if (!ofw_bus_is_compatible(dev, "marvell,armada-3700-xtal-clock")) 136 return (ENXIO); 137 138 device_set_desc(dev, "Marvell Armada 3700 Oscillator"); 139 return (BUS_PROBE_DEFAULT); 140 } 141 142 static int 143 a37x0_xtal_detach(device_t dev) 144 { 145 146 return (EBUSY); 147 } 148