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 26 /* 27 * Allwinner module software reset registers 28 */ 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/bus.h> 33 #include <sys/rman.h> 34 #include <sys/kernel.h> 35 #include <sys/lock.h> 36 #include <sys/module.h> 37 #include <sys/mutex.h> 38 #include <machine/bus.h> 39 40 #include <dev/ofw/ofw_bus.h> 41 #include <dev/ofw/ofw_bus_subr.h> 42 43 #include <dev/hwreset/hwreset.h> 44 45 #include "hwreset_if.h" 46 47 #define RESET_OFFSET(index) ((index / 32) * 4) 48 #define RESET_SHIFT(index) (index % 32) 49 50 static struct ofw_compat_data compat_data[] = { 51 { "allwinner,sun6i-a31-ahb1-reset", 1 }, 52 { "allwinner,sun6i-a31-clock-reset", 1 }, 53 { NULL, 0 } 54 }; 55 56 struct aw_reset_softc { 57 struct resource *res; 58 struct mtx mtx; 59 }; 60 61 static struct resource_spec aw_reset_spec[] = { 62 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 63 { -1, 0 } 64 }; 65 66 #define RESET_READ(sc, reg) bus_read_4((sc)->res, (reg)) 67 #define RESET_WRITE(sc, reg, val) bus_write_4((sc)->res, (reg), (val)) 68 69 static int 70 aw_reset_assert(device_t dev, intptr_t id, bool reset) 71 { 72 struct aw_reset_softc *sc; 73 uint32_t reg_value; 74 75 sc = device_get_softc(dev); 76 77 mtx_lock(&sc->mtx); 78 reg_value = RESET_READ(sc, RESET_OFFSET(id)); 79 if (reset) 80 reg_value &= ~(1 << RESET_SHIFT(id)); 81 else 82 reg_value |= (1 << RESET_SHIFT(id)); 83 RESET_WRITE(sc, RESET_OFFSET(id), reg_value); 84 mtx_unlock(&sc->mtx); 85 86 return (0); 87 } 88 89 static int 90 aw_reset_is_asserted(device_t dev, intptr_t id, bool *reset) 91 { 92 struct aw_reset_softc *sc; 93 uint32_t reg_value; 94 95 sc = device_get_softc(dev); 96 97 mtx_lock(&sc->mtx); 98 reg_value = RESET_READ(sc, RESET_OFFSET(id)); 99 mtx_unlock(&sc->mtx); 100 101 *reset = (reg_value & (1 << RESET_SHIFT(id))) != 0 ? false : true; 102 103 return (0); 104 } 105 106 static int 107 aw_reset_probe(device_t dev) 108 { 109 if (!ofw_bus_status_okay(dev)) 110 return (ENXIO); 111 112 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 113 return (ENXIO); 114 115 device_set_desc(dev, "Allwinner Module Resets"); 116 return (BUS_PROBE_DEFAULT); 117 } 118 119 static int 120 aw_reset_attach(device_t dev) 121 { 122 struct aw_reset_softc *sc; 123 124 sc = device_get_softc(dev); 125 126 if (bus_alloc_resources(dev, aw_reset_spec, &sc->res) != 0) { 127 device_printf(dev, "cannot allocate resources for device\n"); 128 return (ENXIO); 129 } 130 131 mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF); 132 133 hwreset_register_ofw_provider(dev); 134 135 return (0); 136 } 137 138 static device_method_t aw_reset_methods[] = { 139 /* Device interface */ 140 DEVMETHOD(device_probe, aw_reset_probe), 141 DEVMETHOD(device_attach, aw_reset_attach), 142 143 /* Reset interface */ 144 DEVMETHOD(hwreset_assert, aw_reset_assert), 145 DEVMETHOD(hwreset_is_asserted, aw_reset_is_asserted), 146 147 DEVMETHOD_END 148 }; 149 150 static driver_t aw_reset_driver = { 151 "aw_reset", 152 aw_reset_methods, 153 sizeof(struct aw_reset_softc), 154 }; 155 156 EARLY_DRIVER_MODULE(aw_reset, simplebus, aw_reset_driver, 0, 0, 157 BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE); 158 MODULE_VERSION(aw_reset, 1); 159