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/module.h> 42 #include <machine/bus.h> 43 44 #include <dev/ofw/ofw_bus.h> 45 #include <dev/ofw/ofw_bus_subr.h> 46 47 #include <dev/extres/hwreset/hwreset.h> 48 49 #include "hwreset_if.h" 50 51 #define RESET_OFFSET(index) ((index / 32) * 4) 52 #define RESET_SHIFT(index) (index % 32) 53 54 static struct ofw_compat_data compat_data[] = { 55 { "allwinner,sun6i-a31-ahb1-reset", 1 }, 56 { "allwinner,sun6i-a31-clock-reset", 1 }, 57 { NULL, 0 } 58 }; 59 60 struct aw_reset_softc { 61 struct resource *res; 62 struct mtx mtx; 63 }; 64 65 static struct resource_spec aw_reset_spec[] = { 66 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 67 { -1, 0 } 68 }; 69 70 #define RESET_READ(sc, reg) bus_read_4((sc)->res, (reg)) 71 #define RESET_WRITE(sc, reg, val) bus_write_4((sc)->res, (reg), (val)) 72 73 static int 74 aw_reset_assert(device_t dev, intptr_t id, bool reset) 75 { 76 struct aw_reset_softc *sc; 77 uint32_t reg_value; 78 79 sc = device_get_softc(dev); 80 81 mtx_lock(&sc->mtx); 82 reg_value = RESET_READ(sc, RESET_OFFSET(id)); 83 if (reset) 84 reg_value &= ~(1 << RESET_SHIFT(id)); 85 else 86 reg_value |= (1 << RESET_SHIFT(id)); 87 RESET_WRITE(sc, RESET_OFFSET(id), reg_value); 88 mtx_unlock(&sc->mtx); 89 90 return (0); 91 } 92 93 static int 94 aw_reset_is_asserted(device_t dev, intptr_t id, bool *reset) 95 { 96 struct aw_reset_softc *sc; 97 uint32_t reg_value; 98 99 sc = device_get_softc(dev); 100 101 mtx_lock(&sc->mtx); 102 reg_value = RESET_READ(sc, RESET_OFFSET(id)); 103 mtx_unlock(&sc->mtx); 104 105 *reset = (reg_value & (1 << RESET_SHIFT(id))) != 0 ? false : true; 106 107 return (0); 108 } 109 110 static int 111 aw_reset_probe(device_t dev) 112 { 113 if (!ofw_bus_status_okay(dev)) 114 return (ENXIO); 115 116 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 117 return (ENXIO); 118 119 device_set_desc(dev, "Allwinner Module Resets"); 120 return (BUS_PROBE_DEFAULT); 121 } 122 123 static int 124 aw_reset_attach(device_t dev) 125 { 126 struct aw_reset_softc *sc; 127 128 sc = device_get_softc(dev); 129 130 if (bus_alloc_resources(dev, aw_reset_spec, &sc->res) != 0) { 131 device_printf(dev, "cannot allocate resources for device\n"); 132 return (ENXIO); 133 } 134 135 mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF); 136 137 hwreset_register_ofw_provider(dev); 138 139 return (0); 140 } 141 142 static device_method_t aw_reset_methods[] = { 143 /* Device interface */ 144 DEVMETHOD(device_probe, aw_reset_probe), 145 DEVMETHOD(device_attach, aw_reset_attach), 146 147 /* Reset interface */ 148 DEVMETHOD(hwreset_assert, aw_reset_assert), 149 DEVMETHOD(hwreset_is_asserted, aw_reset_is_asserted), 150 151 DEVMETHOD_END 152 }; 153 154 static driver_t aw_reset_driver = { 155 "aw_reset", 156 aw_reset_methods, 157 sizeof(struct aw_reset_softc), 158 }; 159 160 static devclass_t aw_reset_devclass; 161 162 EARLY_DRIVER_MODULE(aw_reset, simplebus, aw_reset_driver, aw_reset_devclass, 163 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 164 MODULE_VERSION(aw_reset, 1); 165