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/cdefs.h> 29 #include <sys/param.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/module.h> 33 #include <sys/mutex.h> 34 #include <sys/rman.h> 35 #include <machine/bus.h> 36 37 #include <dev/fdt/simplebus.h> 38 39 #include <dev/extres/clk/clk.h> 40 #include <dev/extres/clk/clk_fixed.h> 41 #include <dev/extres/syscon/syscon.h> 42 43 #include <dev/ofw/ofw_bus.h> 44 #include <dev/ofw/ofw_bus_subr.h> 45 46 #include "syscon_if.h" 47 48 #define BIT(x) (1 << (x)) 49 50 #define NB_GPIO1_PIN_LT_L 0x8 51 #define NB_GPIO1_MPP1_9 BIT(9) 52 53 struct a37x0_xtal_softc { 54 device_t dev; 55 struct clkdom *clkdom; 56 }; 57 58 static int a37x0_xtal_attach(device_t dev); 59 static int a37x0_xtal_detach(device_t dev); 60 static int a37x0_xtal_probe(device_t dev); 61 62 static device_method_t a37x0_xtal_methods [] = { 63 DEVMETHOD(device_probe, a37x0_xtal_probe), 64 DEVMETHOD(device_attach, a37x0_xtal_attach), 65 DEVMETHOD(device_detach, a37x0_xtal_detach), 66 DEVMETHOD_END 67 }; 68 69 static driver_t a37x0_xtal_driver = { 70 "a37x0-xtal", 71 a37x0_xtal_methods, 72 sizeof(struct a37x0_xtal_softc) 73 }; 74 75 EARLY_DRIVER_MODULE(a37x0_xtal, simplebus, a37x0_xtal_driver, 0, 0, 76 BUS_PASS_TIMER + BUS_PASS_ORDER_EARLY); 77 78 static int 79 a37x0_xtal_attach(device_t dev) 80 { 81 struct a37x0_xtal_softc *sc; 82 struct clk_fixed_def def; 83 struct syscon *syscon; 84 uint32_t reg; 85 int error; 86 87 sc = device_get_softc(dev); 88 89 def.clkdef.name = "armada-3700-xtal"; 90 def.clkdef.parent_names = NULL; 91 def.clkdef.parent_cnt = 0; 92 def.clkdef.id = 1; 93 def.mult = 0; 94 def.div = 0; 95 96 if (SYSCON_GET_HANDLE(dev, &syscon) != 0 || syscon == NULL){ 97 device_printf(dev, "Cannot get syscon driver handle\n"); 98 return (ENXIO); 99 } 100 101 reg = SYSCON_READ_4(syscon, NB_GPIO1_PIN_LT_L); 102 if (reg & NB_GPIO1_MPP1_9) 103 def.freq = 40000000; 104 else 105 def.freq = 25000000; 106 107 sc->clkdom = clkdom_create(dev); 108 error = clknode_fixed_register(sc->clkdom, &def); 109 if (error){ 110 device_printf(dev, "Cannot register clock node\n"); 111 return (ENXIO); 112 } 113 114 error = clkdom_finit(sc->clkdom); 115 if (error){ 116 device_printf(dev, "Cannot finalize clock domain initialization\n"); 117 return (ENXIO); 118 } 119 120 if (bootverbose) 121 clkdom_dump(sc->clkdom); 122 123 return (0); 124 } 125 126 static int 127 a37x0_xtal_probe(device_t dev) 128 { 129 130 if (!ofw_bus_status_okay(dev)) 131 return (ENXIO); 132 133 if (!ofw_bus_is_compatible(dev, "marvell,armada-3700-xtal-clock")) 134 return (ENXIO); 135 136 device_set_desc(dev, "Marvell Armada 3700 Oscillator"); 137 return (BUS_PROBE_DEFAULT); 138 } 139 140 static int 141 a37x0_xtal_detach(device_t dev) 142 { 143 144 return (EBUSY); 145 } 146