1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 35 #include <sys/systm.h> 36 #include <sys/bus.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/malloc.h> 40 #include <sys/rman.h> 41 #include <sys/timeet.h> 42 #include <sys/timetc.h> 43 #include <sys/watchdog.h> 44 45 #include <dev/fdt/fdt_common.h> 46 #include <dev/ofw/openfirm.h> 47 #include <dev/ofw/ofw_bus.h> 48 #include <dev/ofw/ofw_bus_subr.h> 49 50 #include <machine/bus.h> 51 #include <machine/cpu.h> 52 #include <machine/intr.h> 53 54 #include <arm/freescale/vybrid/vf_iomuxc.h> 55 #include <arm/freescale/vybrid/vf_common.h> 56 57 #define MUX_MODE_MASK 7 58 #define MUX_MODE_SHIFT 20 59 #define MUX_MODE_GPIO 0 60 #define MUX_MODE_VBUS_EN_OTG 2 61 62 #define IBE (1 << 0) /* Input Buffer Enable Field */ 63 #define OBE (1 << 1) /* Output Buffer Enable Field. */ 64 #define PUE (1 << 2) /* Pull / Keep Select Field. */ 65 #define PKE (1 << 3) /* Pull / Keep Enable Field. */ 66 #define HYS (1 << 9) /* Hysteresis Enable Field */ 67 #define ODE (1 << 10) /* Open Drain Enable Field. */ 68 #define SRE (1 << 11) /* Slew Rate Field. */ 69 70 #define SPEED_SHIFT 12 71 #define SPEED_MASK 0x3 72 #define SPEED_LOW 0 /* 50 MHz */ 73 #define SPEED_MEDIUM 0x1 /* 100 MHz */ 74 #define SPEED_HIGH 0x3 /* 200 MHz */ 75 76 #define PUS_SHIFT 4 /* Pull Up / Down Config Field Shift */ 77 #define PUS_MASK 0x3 78 #define PUS_100_KOHM_PULL_DOWN 0 79 #define PUS_47_KOHM_PULL_UP 0x1 80 #define PUS_100_KOHM_PULL_UP 0x2 81 #define PUS_22_KOHM_PULL_UP 0x3 82 83 #define DSE_SHIFT 6 /* Drive Strength Field Shift */ 84 #define DSE_MASK 0x7 85 #define DSE_DISABLED 0 /* Output driver disabled */ 86 #define DSE_150_OHM 0x1 87 #define DSE_75_OHM 0x2 88 #define DSE_50_OHM 0x3 89 #define DSE_37_OHM 0x4 90 #define DSE_30_OHM 0x5 91 #define DSE_25_OHM 0x6 92 #define DSE_20_OHM 0x7 93 94 #define MAX_MUX_LEN 1024 95 96 struct iomuxc_softc { 97 struct resource *tmr_res[1]; 98 bus_space_tag_t bst; 99 bus_space_handle_t bsh; 100 device_t dev; 101 }; 102 103 static struct resource_spec iomuxc_spec[] = { 104 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 105 { -1, 0 } 106 }; 107 108 static int 109 iomuxc_probe(device_t dev) 110 { 111 112 if (!ofw_bus_status_okay(dev)) 113 return (ENXIO); 114 115 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc")) 116 return (ENXIO); 117 118 device_set_desc(dev, "Vybrid Family IOMUXC Unit"); 119 return (BUS_PROBE_DEFAULT); 120 } 121 122 static int 123 pinmux_set(struct iomuxc_softc *sc) 124 { 125 phandle_t child, parent, root; 126 pcell_t iomux_config[MAX_MUX_LEN]; 127 int len; 128 int values; 129 int pin; 130 int pin_cfg; 131 int i; 132 133 root = OF_finddevice("/"); 134 len = 0; 135 parent = root; 136 137 /* Find 'iomux_config' prop in the nodes */ 138 for (child = OF_child(parent); child != 0; child = OF_peer(child)) { 139 /* Find a 'leaf'. Start the search from this node. */ 140 while (OF_child(child)) { 141 parent = child; 142 child = OF_child(child); 143 } 144 145 if (!ofw_bus_node_status_okay(child)) 146 continue; 147 148 if ((len = OF_getproplen(child, "iomux_config")) > 0) { 149 OF_getencprop(child, "iomux_config", iomux_config, len); 150 151 values = len / (sizeof(uint32_t)); 152 for (i = 0; i < values; i += 2) { 153 pin = iomux_config[i]; 154 pin_cfg = iomux_config[i+1]; 155 #if 0 156 device_printf(sc->dev, "Set pin %d to 0x%08x\n", 157 pin, pin_cfg); 158 #endif 159 WRITE4(sc, IOMUXC(pin), pin_cfg); 160 } 161 } 162 163 if (OF_peer(child) == 0) { 164 /* No more siblings. */ 165 child = parent; 166 parent = OF_parent(child); 167 } 168 } 169 170 return (0); 171 } 172 173 static int 174 iomuxc_attach(device_t dev) 175 { 176 struct iomuxc_softc *sc; 177 178 sc = device_get_softc(dev); 179 sc->dev = dev; 180 181 if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) { 182 device_printf(dev, "could not allocate resources\n"); 183 return (ENXIO); 184 } 185 186 /* Memory interface */ 187 sc->bst = rman_get_bustag(sc->tmr_res[0]); 188 sc->bsh = rman_get_bushandle(sc->tmr_res[0]); 189 190 pinmux_set(sc); 191 192 return (0); 193 } 194 195 static device_method_t iomuxc_methods[] = { 196 DEVMETHOD(device_probe, iomuxc_probe), 197 DEVMETHOD(device_attach, iomuxc_attach), 198 { 0, 0 } 199 }; 200 201 static driver_t iomuxc_driver = { 202 "iomuxc", 203 iomuxc_methods, 204 sizeof(struct iomuxc_softc), 205 }; 206 207 DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, 0, 0); 208