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