1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2013-2014 Ruslan Bukin <br@bsdpad.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * Vybrid Family Input/Output Multiplexer Controller (IOMUXC) 31 * Chapter 5, Vybrid Reference Manual, Rev. 5, 07/2013 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/bus.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <sys/malloc.h> 43 #include <sys/rman.h> 44 #include <sys/timeet.h> 45 #include <sys/timetc.h> 46 #include <sys/watchdog.h> 47 48 #include <dev/fdt/fdt_common.h> 49 #include <dev/ofw/openfirm.h> 50 #include <dev/ofw/ofw_bus.h> 51 #include <dev/ofw/ofw_bus_subr.h> 52 53 #include <machine/bus.h> 54 #include <machine/cpu.h> 55 #include <machine/intr.h> 56 57 #include <arm/freescale/vybrid/vf_iomuxc.h> 58 #include <arm/freescale/vybrid/vf_common.h> 59 60 #define MUX_MODE_MASK 7 61 #define MUX_MODE_SHIFT 20 62 #define MUX_MODE_GPIO 0 63 #define MUX_MODE_VBUS_EN_OTG 2 64 65 #define IBE (1 << 0) /* Input Buffer Enable Field */ 66 #define OBE (1 << 1) /* Output Buffer Enable Field. */ 67 #define PUE (1 << 2) /* Pull / Keep Select Field. */ 68 #define PKE (1 << 3) /* Pull / Keep Enable Field. */ 69 #define HYS (1 << 9) /* Hysteresis Enable Field */ 70 #define ODE (1 << 10) /* Open Drain Enable Field. */ 71 #define SRE (1 << 11) /* Slew Rate Field. */ 72 73 #define SPEED_SHIFT 12 74 #define SPEED_MASK 0x3 75 #define SPEED_LOW 0 /* 50 MHz */ 76 #define SPEED_MEDIUM 0x1 /* 100 MHz */ 77 #define SPEED_HIGH 0x3 /* 200 MHz */ 78 79 #define PUS_SHIFT 4 /* Pull Up / Down Config Field Shift */ 80 #define PUS_MASK 0x3 81 #define PUS_100_KOHM_PULL_DOWN 0 82 #define PUS_47_KOHM_PULL_UP 0x1 83 #define PUS_100_KOHM_PULL_UP 0x2 84 #define PUS_22_KOHM_PULL_UP 0x3 85 86 #define DSE_SHIFT 6 /* Drive Strength Field Shift */ 87 #define DSE_MASK 0x7 88 #define DSE_DISABLED 0 /* Output driver disabled */ 89 #define DSE_150_OHM 0x1 90 #define DSE_75_OHM 0x2 91 #define DSE_50_OHM 0x3 92 #define DSE_37_OHM 0x4 93 #define DSE_30_OHM 0x5 94 #define DSE_25_OHM 0x6 95 #define DSE_20_OHM 0x7 96 97 #define MAX_MUX_LEN 1024 98 99 struct iomuxc_softc { 100 struct resource *tmr_res[1]; 101 bus_space_tag_t bst; 102 bus_space_handle_t bsh; 103 device_t dev; 104 }; 105 106 static struct resource_spec iomuxc_spec[] = { 107 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 108 { -1, 0 } 109 }; 110 111 static int 112 iomuxc_probe(device_t dev) 113 { 114 115 if (!ofw_bus_status_okay(dev)) 116 return (ENXIO); 117 118 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc")) 119 return (ENXIO); 120 121 device_set_desc(dev, "Vybrid Family IOMUXC Unit"); 122 return (BUS_PROBE_DEFAULT); 123 } 124 125 static int 126 pinmux_set(struct iomuxc_softc *sc) 127 { 128 phandle_t child, parent, root; 129 pcell_t iomux_config[MAX_MUX_LEN]; 130 int len; 131 int values; 132 int pin; 133 int pin_cfg; 134 int i; 135 136 root = OF_finddevice("/"); 137 len = 0; 138 parent = root; 139 140 /* Find 'iomux_config' prop in the nodes */ 141 for (child = OF_child(parent); child != 0; child = OF_peer(child)) { 142 143 /* Find a 'leaf'. Start the search from this node. */ 144 while (OF_child(child)) { 145 parent = child; 146 child = OF_child(child); 147 } 148 149 if (!fdt_is_enabled(child)) 150 continue; 151 152 if ((len = OF_getproplen(child, "iomux_config")) > 0) { 153 OF_getencprop(child, "iomux_config", iomux_config, len); 154 155 values = len / (sizeof(uint32_t)); 156 for (i = 0; i < values; i += 2) { 157 pin = iomux_config[i]; 158 pin_cfg = iomux_config[i+1]; 159 #if 0 160 device_printf(sc->dev, "Set pin %d to 0x%08x\n", 161 pin, pin_cfg); 162 #endif 163 WRITE4(sc, IOMUXC(pin), pin_cfg); 164 } 165 } 166 167 if (OF_peer(child) == 0) { 168 /* No more siblings. */ 169 child = parent; 170 parent = OF_parent(child); 171 } 172 } 173 174 return (0); 175 } 176 177 static int 178 iomuxc_attach(device_t dev) 179 { 180 struct iomuxc_softc *sc; 181 182 sc = device_get_softc(dev); 183 sc->dev = dev; 184 185 if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) { 186 device_printf(dev, "could not allocate resources\n"); 187 return (ENXIO); 188 } 189 190 /* Memory interface */ 191 sc->bst = rman_get_bustag(sc->tmr_res[0]); 192 sc->bsh = rman_get_bushandle(sc->tmr_res[0]); 193 194 pinmux_set(sc); 195 196 return (0); 197 } 198 199 static device_method_t iomuxc_methods[] = { 200 DEVMETHOD(device_probe, iomuxc_probe), 201 DEVMETHOD(device_attach, iomuxc_attach), 202 { 0, 0 } 203 }; 204 205 static driver_t iomuxc_driver = { 206 "iomuxc", 207 iomuxc_methods, 208 sizeof(struct iomuxc_softc), 209 }; 210 211 static devclass_t iomuxc_devclass; 212 213 DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, iomuxc_devclass, 0, 0); 214