1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2025 Bojan Novković <bnovkov@FreeBSD.org 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/systm.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/lock.h> 33 #include <sys/module.h> 34 #include <sys/mutex.h> 35 #include <sys/rman.h> 36 37 #include <machine/bus.h> 38 #include <machine/cpu.h> 39 #include <machine/bus.h> 40 #include <machine/resource.h> 41 42 #include <dev/hwreset/hwreset.h> 43 #include <dev/syscon/syscon.h> 44 #include <dev/ofw/ofw_bus.h> 45 #include <dev/ofw/ofw_bus_subr.h> 46 #include <dev/ofw/openfirm.h> 47 48 #include "syscon_if.h" 49 #include "hwreset_if.h" 50 51 struct cvitek_reset_softc { 52 device_t dev; 53 struct mtx mtx; 54 struct syscon *syscon; 55 }; 56 57 static int 58 cvitek_reset_probe(device_t dev) 59 { 60 61 if (!ofw_bus_status_okay(dev)) 62 return (ENXIO); 63 64 if (ofw_bus_is_compatible(dev, "cvitek,reset")) { 65 device_set_desc(dev, "CVITEK reset controller"); 66 return (BUS_PROBE_DEFAULT); 67 } 68 69 return (ENXIO); 70 } 71 72 static int 73 cvitek_reset_attach(device_t dev) 74 { 75 struct cvitek_reset_softc *sc; 76 int error; 77 78 sc = device_get_softc(dev); 79 sc->dev = dev; 80 81 error = syscon_get_by_ofw_property(dev, ofw_bus_get_node(dev), 82 "syscon", &sc->syscon); 83 if (error != 0) { 84 device_printf(dev, "Couldn't get syscon handle\n"); 85 return (error); 86 } 87 mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF); 88 89 hwreset_register_ofw_provider(dev); 90 91 return (0); 92 } 93 94 static int 95 cvitek_reset_assert(device_t dev, intptr_t id, bool reset) 96 { 97 struct cvitek_reset_softc *sc; 98 uint32_t offset, val; 99 uint32_t bit; 100 101 sc = device_get_softc(dev); 102 bit = id % 32; 103 offset = id / 32; 104 105 mtx_lock(&sc->mtx); 106 val = SYSCON_READ_4(sc->syscon, offset); 107 if (reset) 108 val &= ~(1 << bit); 109 else 110 val |= (1 << bit); 111 SYSCON_WRITE_4(sc->syscon, offset, val); 112 mtx_unlock(&sc->mtx); 113 114 return (0); 115 } 116 117 static device_method_t cvitek_reset_methods[] = { 118 DEVMETHOD(device_probe, cvitek_reset_probe), 119 DEVMETHOD(device_attach, cvitek_reset_attach), 120 121 DEVMETHOD(hwreset_assert, cvitek_reset_assert), 122 123 DEVMETHOD_END 124 }; 125 126 static driver_t cvitek_reset_driver = { 127 "cvitek_reset", 128 cvitek_reset_methods, 129 sizeof(struct cvitek_reset_softc) 130 }; 131 132 DRIVER_MODULE(cvitek_reset, simplebus, cvitek_reset_driver, 0, 0); 133