1 /*- 2 * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* 30 * Allwinner module software reset registers 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/bus.h> 39 #include <sys/rman.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/module.h> 43 #include <sys/mutex.h> 44 #include <machine/bus.h> 45 46 #include <dev/ofw/ofw_bus.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include <dev/extres/hwreset/hwreset.h> 50 51 #include "hwreset_if.h" 52 53 #define RESET_OFFSET(index) ((index / 32) * 4) 54 #define RESET_SHIFT(index) (index % 32) 55 56 static struct ofw_compat_data compat_data[] = { 57 { "allwinner,sun6i-a31-ahb1-reset", 1 }, 58 { "allwinner,sun6i-a31-clock-reset", 1 }, 59 { NULL, 0 } 60 }; 61 62 struct aw_reset_softc { 63 struct resource *res; 64 struct mtx mtx; 65 }; 66 67 static struct resource_spec aw_reset_spec[] = { 68 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 69 { -1, 0 } 70 }; 71 72 #define RESET_READ(sc, reg) bus_read_4((sc)->res, (reg)) 73 #define RESET_WRITE(sc, reg, val) bus_write_4((sc)->res, (reg), (val)) 74 75 static int 76 aw_reset_assert(device_t dev, intptr_t id, bool reset) 77 { 78 struct aw_reset_softc *sc; 79 uint32_t reg_value; 80 81 sc = device_get_softc(dev); 82 83 mtx_lock(&sc->mtx); 84 reg_value = RESET_READ(sc, RESET_OFFSET(id)); 85 if (reset) 86 reg_value &= ~(1 << RESET_SHIFT(id)); 87 else 88 reg_value |= (1 << RESET_SHIFT(id)); 89 RESET_WRITE(sc, RESET_OFFSET(id), reg_value); 90 mtx_unlock(&sc->mtx); 91 92 return (0); 93 } 94 95 static int 96 aw_reset_is_asserted(device_t dev, intptr_t id, bool *reset) 97 { 98 struct aw_reset_softc *sc; 99 uint32_t reg_value; 100 101 sc = device_get_softc(dev); 102 103 mtx_lock(&sc->mtx); 104 reg_value = RESET_READ(sc, RESET_OFFSET(id)); 105 mtx_unlock(&sc->mtx); 106 107 *reset = (reg_value & (1 << RESET_SHIFT(id))) != 0 ? false : true; 108 109 return (0); 110 } 111 112 static int 113 aw_reset_probe(device_t dev) 114 { 115 if (!ofw_bus_status_okay(dev)) 116 return (ENXIO); 117 118 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 119 return (ENXIO); 120 121 device_set_desc(dev, "Allwinner Module Resets"); 122 return (BUS_PROBE_DEFAULT); 123 } 124 125 static int 126 aw_reset_attach(device_t dev) 127 { 128 struct aw_reset_softc *sc; 129 130 sc = device_get_softc(dev); 131 132 if (bus_alloc_resources(dev, aw_reset_spec, &sc->res) != 0) { 133 device_printf(dev, "cannot allocate resources for device\n"); 134 return (ENXIO); 135 } 136 137 mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF); 138 139 hwreset_register_ofw_provider(dev); 140 141 return (0); 142 } 143 144 static device_method_t aw_reset_methods[] = { 145 /* Device interface */ 146 DEVMETHOD(device_probe, aw_reset_probe), 147 DEVMETHOD(device_attach, aw_reset_attach), 148 149 /* Reset interface */ 150 DEVMETHOD(hwreset_assert, aw_reset_assert), 151 DEVMETHOD(hwreset_is_asserted, aw_reset_is_asserted), 152 153 DEVMETHOD_END 154 }; 155 156 static driver_t aw_reset_driver = { 157 "aw_reset", 158 aw_reset_methods, 159 sizeof(struct aw_reset_softc), 160 }; 161 162 static devclass_t aw_reset_devclass; 163 164 EARLY_DRIVER_MODULE(aw_reset, simplebus, aw_reset_driver, aw_reset_devclass, 165 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 166 MODULE_VERSION(aw_reset, 1); 167