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 MUX_MODE_MASK 7 60 #define MUX_MODE_SHIFT 20 61 #define MUX_MODE_GPIO 0 62 #define MUX_MODE_VBUS_EN_OTG 2 63 64 #define IBE (1 << 0) /* Input Buffer Enable Field */ 65 #define OBE (1 << 1) /* Output Buffer Enable Field. */ 66 #define PUE (1 << 2) /* Pull / Keep Select Field. */ 67 #define PKE (1 << 3) /* Pull / Keep Enable Field. */ 68 #define HYS (1 << 9) /* Hysteresis Enable Field */ 69 #define ODE (1 << 10) /* Open Drain Enable Field. */ 70 #define SRE (1 << 11) /* Slew Rate Field. */ 71 72 #define SPEED_SHIFT 12 73 #define SPEED_MASK 0x3 74 #define SPEED_LOW 0 /* 50 MHz */ 75 #define SPEED_MEDIUM 0x1 /* 100 MHz */ 76 #define SPEED_HIGH 0x3 /* 200 MHz */ 77 78 #define PUS_SHIFT 4 /* Pull Up / Down Config Field Shift */ 79 #define PUS_MASK 0x3 80 #define PUS_100_KOHM_PULL_DOWN 0 81 #define PUS_47_KOHM_PULL_UP 0x1 82 #define PUS_100_KOHM_PULL_UP 0x2 83 #define PUS_22_KOHM_PULL_UP 0x3 84 85 #define DSE_SHIFT 6 /* Drive Strength Field Shift */ 86 #define DSE_MASK 0x7 87 #define DSE_DISABLED 0 /* Output driver disabled */ 88 #define DSE_150_OHM 0x1 89 #define DSE_75_OHM 0x2 90 #define DSE_50_OHM 0x3 91 #define DSE_37_OHM 0x4 92 #define DSE_30_OHM 0x5 93 #define DSE_25_OHM 0x6 94 #define DSE_20_OHM 0x7 95 96 #define MAX_MUX_LEN 1024 97 98 struct iomuxc_softc { 99 struct resource *tmr_res[1]; 100 bus_space_tag_t bst; 101 bus_space_handle_t bsh; 102 device_t dev; 103 }; 104 105 static struct resource_spec iomuxc_spec[] = { 106 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 107 { -1, 0 } 108 }; 109 110 static int 111 iomuxc_probe(device_t dev) 112 { 113 114 if (!ofw_bus_status_okay(dev)) 115 return (ENXIO); 116 117 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc")) 118 return (ENXIO); 119 120 device_set_desc(dev, "Vybrid Family IOMUXC Unit"); 121 return (BUS_PROBE_DEFAULT); 122 } 123 124 static int 125 pinmux_set(struct iomuxc_softc *sc) 126 { 127 phandle_t child, parent, root; 128 pcell_t iomux_config[MAX_MUX_LEN]; 129 int len; 130 int values; 131 int pin; 132 int pin_cfg; 133 int i; 134 135 root = OF_finddevice("/"); 136 len = 0; 137 parent = root; 138 139 /* Find 'iomux_config' prop in the nodes */ 140 for (child = OF_child(parent); child != 0; child = OF_peer(child)) { 141 142 /* Find a 'leaf'. Start the search from this node. */ 143 while (OF_child(child)) { 144 parent = child; 145 child = OF_child(child); 146 } 147 148 if (!fdt_is_enabled(child)) 149 continue; 150 151 if ((len = OF_getproplen(child, "iomux_config")) > 0) { 152 OF_getprop(child, "iomux_config", &iomux_config, len); 153 154 values = len / (sizeof(uint32_t)); 155 for (i = 0; i < values; i += 2) { 156 pin = fdt32_to_cpu(iomux_config[i]); 157 pin_cfg = fdt32_to_cpu(iomux_config[i+1]); 158 #if 0 159 device_printf(sc->dev, "Set pin %d to 0x%08x\n", 160 pin, pin_cfg); 161 #endif 162 WRITE4(sc, IOMUXC(pin), pin_cfg); 163 } 164 } 165 166 if (OF_peer(child) == 0) { 167 /* No more siblings. */ 168 child = parent; 169 parent = OF_parent(child); 170 } 171 } 172 173 return (0); 174 } 175 176 static int 177 iomuxc_attach(device_t dev) 178 { 179 struct iomuxc_softc *sc; 180 181 sc = device_get_softc(dev); 182 sc->dev = dev; 183 184 if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) { 185 device_printf(dev, "could not allocate resources\n"); 186 return (ENXIO); 187 } 188 189 /* Memory interface */ 190 sc->bst = rman_get_bustag(sc->tmr_res[0]); 191 sc->bsh = rman_get_bushandle(sc->tmr_res[0]); 192 193 pinmux_set(sc); 194 195 return (0); 196 } 197 198 static device_method_t iomuxc_methods[] = { 199 DEVMETHOD(device_probe, iomuxc_probe), 200 DEVMETHOD(device_attach, iomuxc_attach), 201 { 0, 0 } 202 }; 203 204 static driver_t iomuxc_driver = { 205 "iomuxc", 206 iomuxc_methods, 207 sizeof(struct iomuxc_softc), 208 }; 209 210 static devclass_t iomuxc_devclass; 211 212 DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, iomuxc_devclass, 0, 0); 213