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