1 /*- 2 * Copyright (c) 2013-2014 Ruslan Bukin <br@bsdpad.com> 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 /* 28 * Vybrid Family Input/Output Multiplexer Controller (IOMUXC) 29 * Chapter 5, Vybrid Reference Manual, Rev. 5, 07/2013 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/kernel.h> 39 #include <sys/module.h> 40 #include <sys/malloc.h> 41 #include <sys/rman.h> 42 #include <sys/timeet.h> 43 #include <sys/timetc.h> 44 #include <sys/watchdog.h> 45 46 #include <dev/fdt/fdt_common.h> 47 #include <dev/ofw/openfirm.h> 48 #include <dev/ofw/ofw_bus.h> 49 #include <dev/ofw/ofw_bus_subr.h> 50 51 #include <machine/bus.h> 52 #include <machine/fdt.h> 53 #include <machine/cpu.h> 54 #include <machine/intr.h> 55 56 #include <arm/freescale/vybrid/vf_iomuxc.h> 57 #include <arm/freescale/vybrid/vf_common.h> 58 59 #define IBE (1 << 0) /* Input Buffer Enable Field */ 60 #define OBE (1 << 1) /* Output Buffer Enable Field. */ 61 #define PUE (1 << 2) /* Pull / Keep Select Field. */ 62 #define PKE (1 << 3) /* Pull / Keep Enable Field. */ 63 #define PUS_MASK (3 << 4) /* Pull Up / Down Config Field. */ 64 #define DSE_MASK (7 << 6) /* Drive Strength Field. */ 65 #define HYS (1 << 9) /* Hysteresis Enable Field */ 66 67 #define MUX_MODE_MASK 7 68 #define MUX_MODE_SHIFT 20 69 #define MUX_MODE_GPIO 0 70 #define MUX_MODE_VBUS_EN_OTG 2 71 72 #define PUS_22_KOHM_PULL_UP (3 << 4) 73 #define DSE_25_OHM (6 << 6) 74 75 #define MAX_MUX_LEN 1024 76 77 struct iomuxc_softc { 78 struct resource *tmr_res[1]; 79 bus_space_tag_t bst; 80 bus_space_handle_t bsh; 81 device_t dev; 82 }; 83 84 static struct resource_spec iomuxc_spec[] = { 85 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 86 { -1, 0 } 87 }; 88 89 static int 90 iomuxc_probe(device_t dev) 91 { 92 93 if (!ofw_bus_status_okay(dev)) 94 return (ENXIO); 95 96 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc")) 97 return (ENXIO); 98 99 device_set_desc(dev, "Vybrid Family IOMUXC Unit"); 100 return (BUS_PROBE_DEFAULT); 101 } 102 103 static int 104 configure_pad(struct iomuxc_softc *sc, int pad, int mux_mode) 105 { 106 int reg; 107 108 reg = READ4(sc, pad); 109 reg &= ~(MUX_MODE_MASK << MUX_MODE_SHIFT); 110 reg |= (mux_mode << MUX_MODE_SHIFT); 111 WRITE4(sc, pad, reg); 112 113 return (0); 114 } 115 116 static int 117 pinmux_set(struct iomuxc_softc *sc) 118 { 119 phandle_t child, parent, root; 120 pcell_t iomux_config[MAX_MUX_LEN]; 121 int len; 122 int values; 123 int pin; 124 int mux_mode; 125 int i; 126 127 root = OF_finddevice("/"); 128 len = 0; 129 parent = root; 130 131 /* Find 'iomux_config' prop in the nodes */ 132 for (child = OF_child(parent); child != 0; child = OF_peer(child)) { 133 134 /* Find a 'leaf'. Start the search from this node. */ 135 while (OF_child(child)) { 136 parent = child; 137 child = OF_child(child); 138 } 139 140 if (!fdt_is_enabled(child)) 141 continue; 142 143 if ((len = OF_getproplen(child, "iomux_config")) > 0) { 144 OF_getprop(child, "iomux_config", &iomux_config, len); 145 146 values = len / (sizeof(uint32_t)); 147 for (i = 0; i < values; i += 2) { 148 pin = fdt32_to_cpu(iomux_config[i]); 149 mux_mode = fdt32_to_cpu(iomux_config[i+1]); 150 #if 0 151 device_printf(sc->dev, "Set pin %d to ALT%d\n", 152 pin, mux_mode); 153 #endif 154 configure_pad(sc, IOMUXC(pin), mux_mode); 155 } 156 } 157 158 if (OF_peer(child) == 0) { 159 /* No more siblings. */ 160 child = parent; 161 parent = OF_parent(child); 162 } 163 } 164 165 return (0); 166 } 167 168 static int 169 iomuxc_attach(device_t dev) 170 { 171 struct iomuxc_softc *sc; 172 int reg; 173 174 sc = device_get_softc(dev); 175 sc->dev = dev; 176 177 if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) { 178 device_printf(dev, "could not allocate resources\n"); 179 return (ENXIO); 180 } 181 182 /* Memory interface */ 183 sc->bst = rman_get_bustag(sc->tmr_res[0]); 184 sc->bsh = rman_get_bushandle(sc->tmr_res[0]); 185 186 /* USB */ 187 configure_pad(sc, IOMUXC_PTA17, MUX_MODE_VBUS_EN_OTG); 188 reg = (PKE | PUE | PUS_22_KOHM_PULL_UP | DSE_25_OHM | OBE); 189 WRITE4(sc, IOMUXC_PTA7, reg); 190 191 pinmux_set(sc); 192 193 return (0); 194 } 195 196 static device_method_t iomuxc_methods[] = { 197 DEVMETHOD(device_probe, iomuxc_probe), 198 DEVMETHOD(device_attach, iomuxc_attach), 199 { 0, 0 } 200 }; 201 202 static driver_t iomuxc_driver = { 203 "iomuxc", 204 iomuxc_methods, 205 sizeof(struct iomuxc_softc), 206 }; 207 208 static devclass_t iomuxc_devclass; 209 210 DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, iomuxc_devclass, 0, 0); 211