1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 29 #include <sys/bus.h> 30 #include <sys/kernel.h> 31 #include <sys/module.h> 32 #include <sys/mutex.h> 33 #include <sys/rman.h> 34 #include <machine/bus.h> 35 36 #include <dev/fdt/simplebus.h> 37 38 #include <dev/extres/clk/clk.h> 39 #include <dev/extres/clk/clk_fixed.h> 40 #include <dev/extres/syscon/syscon.h> 41 42 #include <dev/ofw/ofw_bus.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 45 #include "syscon_if.h" 46 47 #define BIT(x) (1 << (x)) 48 49 #define NB_GPIO1_PIN_LT_L 0x8 50 #define NB_GPIO1_MPP1_9 BIT(9) 51 52 struct a37x0_xtal_softc { 53 device_t dev; 54 struct clkdom *clkdom; 55 }; 56 57 static int a37x0_xtal_attach(device_t dev); 58 static int a37x0_xtal_detach(device_t dev); 59 static int a37x0_xtal_probe(device_t dev); 60 61 static device_method_t a37x0_xtal_methods [] = { 62 DEVMETHOD(device_probe, a37x0_xtal_probe), 63 DEVMETHOD(device_attach, a37x0_xtal_attach), 64 DEVMETHOD(device_detach, a37x0_xtal_detach), 65 DEVMETHOD_END 66 }; 67 68 static driver_t a37x0_xtal_driver = { 69 "a37x0-xtal", 70 a37x0_xtal_methods, 71 sizeof(struct a37x0_xtal_softc) 72 }; 73 74 EARLY_DRIVER_MODULE(a37x0_xtal, simplebus, a37x0_xtal_driver, 0, 0, 75 BUS_PASS_TIMER + BUS_PASS_ORDER_EARLY); 76 77 static int 78 a37x0_xtal_attach(device_t dev) 79 { 80 struct a37x0_xtal_softc *sc; 81 struct clk_fixed_def def; 82 struct syscon *syscon; 83 uint32_t reg; 84 int error; 85 86 sc = device_get_softc(dev); 87 88 def.clkdef.name = "armada-3700-xtal"; 89 def.clkdef.parent_names = NULL; 90 def.clkdef.parent_cnt = 0; 91 def.clkdef.id = 1; 92 def.mult = 0; 93 def.div = 0; 94 95 if (SYSCON_GET_HANDLE(dev, &syscon) != 0 || syscon == NULL){ 96 device_printf(dev, "Cannot get syscon driver handle\n"); 97 return (ENXIO); 98 } 99 100 reg = SYSCON_READ_4(syscon, NB_GPIO1_PIN_LT_L); 101 if (reg & NB_GPIO1_MPP1_9) 102 def.freq = 40000000; 103 else 104 def.freq = 25000000; 105 106 sc->clkdom = clkdom_create(dev); 107 error = clknode_fixed_register(sc->clkdom, &def); 108 if (error){ 109 device_printf(dev, "Cannot register clock node\n"); 110 return (ENXIO); 111 } 112 113 error = clkdom_finit(sc->clkdom); 114 if (error){ 115 device_printf(dev, "Cannot finalize clock domain initialization\n"); 116 return (ENXIO); 117 } 118 119 if (bootverbose) 120 clkdom_dump(sc->clkdom); 121 122 return (0); 123 } 124 125 static int 126 a37x0_xtal_probe(device_t dev) 127 { 128 129 if (!ofw_bus_status_okay(dev)) 130 return (ENXIO); 131 132 if (!ofw_bus_is_compatible(dev, "marvell,armada-3700-xtal-clock")) 133 return (ENXIO); 134 135 device_set_desc(dev, "Marvell Armada 3700 Oscillator"); 136 return (BUS_PROBE_DEFAULT); 137 } 138 139 static int 140 a37x0_xtal_detach(device_t dev) 141 { 142 143 return (EBUSY); 144 } 145