/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2013-2014 Ruslan Bukin * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Vybrid Family Input/Output Multiplexer Controller (IOMUXC) * Chapter 5, Vybrid Reference Manual, Rev. 5, 07/2013 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MUX_MODE_MASK 7 #define MUX_MODE_SHIFT 20 #define MUX_MODE_GPIO 0 #define MUX_MODE_VBUS_EN_OTG 2 #define IBE (1 << 0) /* Input Buffer Enable Field */ #define OBE (1 << 1) /* Output Buffer Enable Field. */ #define PUE (1 << 2) /* Pull / Keep Select Field. */ #define PKE (1 << 3) /* Pull / Keep Enable Field. */ #define HYS (1 << 9) /* Hysteresis Enable Field */ #define ODE (1 << 10) /* Open Drain Enable Field. */ #define SRE (1 << 11) /* Slew Rate Field. */ #define SPEED_SHIFT 12 #define SPEED_MASK 0x3 #define SPEED_LOW 0 /* 50 MHz */ #define SPEED_MEDIUM 0x1 /* 100 MHz */ #define SPEED_HIGH 0x3 /* 200 MHz */ #define PUS_SHIFT 4 /* Pull Up / Down Config Field Shift */ #define PUS_MASK 0x3 #define PUS_100_KOHM_PULL_DOWN 0 #define PUS_47_KOHM_PULL_UP 0x1 #define PUS_100_KOHM_PULL_UP 0x2 #define PUS_22_KOHM_PULL_UP 0x3 #define DSE_SHIFT 6 /* Drive Strength Field Shift */ #define DSE_MASK 0x7 #define DSE_DISABLED 0 /* Output driver disabled */ #define DSE_150_OHM 0x1 #define DSE_75_OHM 0x2 #define DSE_50_OHM 0x3 #define DSE_37_OHM 0x4 #define DSE_30_OHM 0x5 #define DSE_25_OHM 0x6 #define DSE_20_OHM 0x7 #define MAX_MUX_LEN 1024 struct iomuxc_softc { struct resource *tmr_res[1]; bus_space_tag_t bst; bus_space_handle_t bsh; device_t dev; }; static struct resource_spec iomuxc_spec[] = { { SYS_RES_MEMORY, 0, RF_ACTIVE }, { -1, 0 } }; static int iomuxc_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc")) return (ENXIO); device_set_desc(dev, "Vybrid Family IOMUXC Unit"); return (BUS_PROBE_DEFAULT); } static int pinmux_set(struct iomuxc_softc *sc) { phandle_t child, parent, root; pcell_t iomux_config[MAX_MUX_LEN]; int len; int values; int pin; int pin_cfg; int i; root = OF_finddevice("/"); len = 0; parent = root; /* Find 'iomux_config' prop in the nodes */ for (child = OF_child(parent); child != 0; child = OF_peer(child)) { /* Find a 'leaf'. Start the search from this node. */ while (OF_child(child)) { parent = child; child = OF_child(child); } if (!ofw_bus_node_status_okay(child)) continue; if ((len = OF_getproplen(child, "iomux_config")) > 0) { OF_getencprop(child, "iomux_config", iomux_config, len); values = len / (sizeof(uint32_t)); for (i = 0; i < values; i += 2) { pin = iomux_config[i]; pin_cfg = iomux_config[i+1]; #if 0 device_printf(sc->dev, "Set pin %d to 0x%08x\n", pin, pin_cfg); #endif WRITE4(sc, IOMUXC(pin), pin_cfg); } } if (OF_peer(child) == 0) { /* No more siblings. */ child = parent; parent = OF_parent(child); } } return (0); } static int iomuxc_attach(device_t dev) { struct iomuxc_softc *sc; sc = device_get_softc(dev); sc->dev = dev; if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) { device_printf(dev, "could not allocate resources\n"); return (ENXIO); } /* Memory interface */ sc->bst = rman_get_bustag(sc->tmr_res[0]); sc->bsh = rman_get_bushandle(sc->tmr_res[0]); pinmux_set(sc); return (0); } static device_method_t iomuxc_methods[] = { DEVMETHOD(device_probe, iomuxc_probe), DEVMETHOD(device_attach, iomuxc_attach), { 0, 0 } }; static driver_t iomuxc_driver = { "iomuxc", iomuxc_methods, sizeof(struct iomuxc_softc), }; DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, 0, 0);