1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2024 Ruslan Bukin <br@bsdpad.com> 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 36 #include <machine/bus.h> 37 #include <machine/cpu.h> 38 39 #include <dev/syscon/syscon.h> 40 #include <dev/hwreset/hwreset.h> 41 42 #include <dev/ofw/ofw_bus.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 #include <dev/ofw/openfirm.h> 45 46 #include "syscon_if.h" 47 #include "hwreset_if.h" 48 49 struct eswin_rst_softc { 50 device_t dev; 51 struct mtx mtx; 52 struct syscon *syscon; 53 }; 54 55 #define RESET_BLOCK 0x400 56 #define RESET_ID_TO_REG(x) (RESET_BLOCK + (x) * 4) 57 58 #define ERST_LOCK(sc) mtx_lock(&(sc)->mtx) 59 #define ERST_UNLOCK(sc) mtx_unlock(&(sc)->mtx) 60 #define ERST_ASSERT_LOCKED(sc) mtx_assert(&(sc)->mtx, MA_OWNED); 61 #define ERST_ASSERT_UNLOCKED(sc) mtx_assert(&(sc)->mtx, MA_NOTOWNED); 62 63 #define ERST_READ(_sc, _reg) \ 64 SYSCON_READ_4(sc->syscon, (_reg)) 65 #define ERST_WRITE(_sc, _reg, _val) \ 66 SYSCON_WRITE_4(sc->syscon, (_reg), (_val)) 67 68 static struct ofw_compat_data compat_data[] = { 69 { "eswin,eic7700-reset", 1 }, 70 { NULL, 0 }, 71 }; 72 73 static int 74 eswin_rst_probe(device_t dev) 75 { 76 77 if (!ofw_bus_status_okay(dev)) 78 return (ENXIO); 79 80 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 81 return (ENXIO); 82 83 device_set_desc(dev, "Eswin Reset"); 84 85 return (BUS_PROBE_DEFAULT); 86 } 87 88 static int 89 eswin_rst_attach(device_t dev) 90 { 91 struct eswin_rst_softc *sc; 92 int error; 93 94 sc = device_get_softc(dev); 95 sc->dev = dev; 96 97 error = syscon_get_by_ofw_node(dev, OF_parent(ofw_bus_get_node(dev)), 98 &sc->syscon); 99 if (error != 0) { 100 device_printf(dev, "Couldn't get syscon handle of parent\n"); 101 return (error); 102 } 103 104 mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF); 105 106 hwreset_register_ofw_provider(dev); 107 108 return (0); 109 } 110 111 static int 112 eswin_rst_reset_assert(device_t dev, intptr_t id, bool reset) 113 { 114 struct eswin_rst_softc *sc; 115 uint32_t reg; 116 uint32_t base; 117 uint32_t bit; 118 119 sc = device_get_softc(dev); 120 121 base = RESET_ID_TO_REG(id >> 5); 122 bit = id & 0x1f; 123 124 ERST_LOCK(sc); 125 reg = ERST_READ(sc, base); 126 if (reset) 127 reg &= ~(1 << bit); 128 else 129 reg |= (1 << bit); 130 ERST_WRITE(sc, base, reg); 131 ERST_UNLOCK(sc); 132 133 return (0); 134 } 135 136 static int 137 eswin_rst_reset_is_asserted(device_t dev, intptr_t id, bool *reset) 138 { 139 struct eswin_rst_softc *sc; 140 uint32_t reg; 141 uint32_t base; 142 uint32_t bit; 143 144 sc = device_get_softc(dev); 145 146 base = RESET_ID_TO_REG(id >> 5); 147 bit = id & 0x1f; 148 149 ERST_LOCK(sc); 150 reg = ERST_READ(sc, base); 151 *reset = (reg & (1 << bit)) == 0; 152 ERST_UNLOCK(sc); 153 154 return (0); 155 } 156 157 static int 158 eswin_rst_map(device_t provider_dev, phandle_t xref, int ncells, 159 pcell_t *cells, intptr_t *id) 160 { 161 162 KASSERT(ncells == 2, ("wrong ncells")); 163 164 *id = cells[0] << 5; 165 *id |= ilog2(cells[1]); 166 167 return (0); 168 } 169 170 static device_method_t eswin_rst_methods[] = { 171 /* Device interface. */ 172 DEVMETHOD(device_probe, eswin_rst_probe), 173 DEVMETHOD(device_attach, eswin_rst_attach), 174 175 /* Reset interface. */ 176 DEVMETHOD(hwreset_assert, eswin_rst_reset_assert), 177 DEVMETHOD(hwreset_is_asserted, eswin_rst_reset_is_asserted), 178 DEVMETHOD(hwreset_map, eswin_rst_map), 179 180 DEVMETHOD_END 181 }; 182 183 static driver_t eswin_rst_driver = { 184 "eswin_rst", 185 eswin_rst_methods, 186 sizeof(struct eswin_rst_softc) 187 }; 188 189 EARLY_DRIVER_MODULE(eswin_rst, simplebus, eswin_rst_driver, 0, 0, 190 BUS_PASS_BUS + BUS_PASS_ORDER_LATE); 191