1 /*- 2 * Copyright (c) 2015 Oleksandr Tymoshenko <gonzo@freebsd.org> 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 AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, 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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 /* 31 * System Reset Control for iMX6 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <sys/bus.h> 39 #include <sys/rman.h> 40 41 #include <dev/ofw/ofw_bus.h> 42 #include <dev/ofw/ofw_bus_subr.h> 43 44 #include <machine/bus.h> 45 46 #include <arm/freescale/imx/imx6_src.h> 47 48 #define SRC_SCR 0 49 #define SW_IPU1_RST (1 << 3) 50 51 struct src_softc { 52 device_t dev; 53 struct resource *mem_res; 54 }; 55 56 static struct src_softc *src_sc; 57 58 static inline uint32_t 59 RD4(struct src_softc *sc, bus_size_t off) 60 { 61 62 return (bus_read_4(sc->mem_res, off)); 63 } 64 65 static inline void 66 WR4(struct src_softc *sc, bus_size_t off, uint32_t val) 67 { 68 69 bus_write_4(sc->mem_res, off, val); 70 } 71 72 int 73 src_reset_ipu(void) 74 { 75 uint32_t reg; 76 int timeout = 10000; 77 78 if (src_sc == NULL) 79 return (-1); 80 81 reg = RD4(src_sc, SRC_SCR); 82 reg |= SW_IPU1_RST; 83 WR4(src_sc, SRC_SCR, reg); 84 85 while (timeout-- > 0) { 86 reg = RD4(src_sc, SRC_SCR); 87 if (reg & SW_IPU1_RST) 88 DELAY(1); 89 else 90 break; 91 } 92 93 if (timeout < 0) 94 return (-1); 95 else 96 return (0); 97 } 98 99 static int 100 src_detach(device_t dev) 101 { 102 struct src_softc *sc; 103 104 sc = device_get_softc(dev); 105 106 if (sc->mem_res != NULL) 107 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res); 108 109 return (0); 110 } 111 112 static int 113 src_attach(device_t dev) 114 { 115 struct src_softc *sc; 116 int err, rid; 117 118 sc = device_get_softc(dev); 119 err = 0; 120 121 /* Allocate bus_space resources. */ 122 rid = 0; 123 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 124 RF_ACTIVE); 125 if (sc->mem_res == NULL) { 126 device_printf(dev, "Cannot allocate memory resources\n"); 127 err = ENXIO; 128 goto out; 129 } 130 131 src_sc = sc; 132 133 err = 0; 134 135 out: 136 137 if (err != 0) 138 src_detach(dev); 139 140 return (err); 141 } 142 143 static int 144 src_probe(device_t dev) 145 { 146 147 if ((ofw_bus_is_compatible(dev, "fsl,imx6q-src") == 0) && 148 (ofw_bus_is_compatible(dev, "fsl,imx6-src") == 0)) 149 return (ENXIO); 150 151 device_set_desc(dev, "Freescale i.MX6 System Reset Controller"); 152 153 return (BUS_PROBE_DEFAULT); 154 } 155 156 static device_method_t src_methods[] = { 157 /* Device interface */ 158 DEVMETHOD(device_probe, src_probe), 159 DEVMETHOD(device_attach, src_attach), 160 DEVMETHOD(device_detach, src_detach), 161 162 DEVMETHOD_END 163 }; 164 165 static driver_t src_driver = { 166 "src", 167 src_methods, 168 sizeof(struct src_softc) 169 }; 170 171 DRIVER_MODULE(src, simplebus, src_driver, 0, 0); 172