5c263f43ef
ARM Cortex-A5/M4 SoC (M4 core is not used in this work). Support includes device drivers for: - NAND Flash Controller (NFC) - USB Enhanced Host Controller Interface (EHCI) - General-Purpose Input/Output (GPIO) - Universal Asynchronous Receiver/Transmitter (UART) Also supported: - Generic Interrupt Controller (GIC) - MPCore timer - ffec ethernet driver Reviewed by: ray Approved by: cognet (mentor)
172 lines
4.6 KiB
C
172 lines
4.6 KiB
C
/*-
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* Copyright (c) 2013 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/fdt.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 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 PUS_MASK (3 << 4) /* Pull Up / Down Config Field. */
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#define DSE_MASK (7 << 6) /* Drive Strength Field. */
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#define HYS (1 << 9) /* Hysteresis Enable Field */
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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_RMII 1
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#define MUX_MODE_RMII_CLKIN 2
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#define MUX_MODE_VBUS_EN_OTG 2
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#define PUS_22_KOHM_PULL_UP (3 << 4)
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#define DSE_25_OHM (6 << 6)
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#define NET0_PAD_START 45
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#define NET1_PAD_START 54
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#define NET_PAD_N 9
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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_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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configure_pad(struct iomuxc_softc *sc, int pad, int mux_mode)
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{
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int reg;
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reg = READ4(sc, pad);
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reg &= ~(MUX_MODE_MASK << MUX_MODE_SHIFT);
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reg |= (mux_mode << MUX_MODE_SHIFT);
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WRITE4(sc, pad, reg);
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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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int reg;
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int i;
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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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/* USB */
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configure_pad(sc, IOMUXC_PTA17, MUX_MODE_VBUS_EN_OTG);
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reg = (PKE | PUE | PUS_22_KOHM_PULL_UP | DSE_25_OHM | OBE);
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WRITE4(sc, IOMUXC_PTA7, reg);
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/* NET */
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configure_pad(sc, IOMUXC_PTA6, MUX_MODE_RMII_CLKIN);
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/* NET0 */
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for (i = NET0_PAD_START; i <= (NET0_PAD_START + NET_PAD_N); i++) {
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configure_pad(sc, IOMUXC(i), MUX_MODE_RMII);
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}
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/* NET1 */
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for (i = NET1_PAD_START; i <= (NET1_PAD_START + NET_PAD_N); i++) {
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configure_pad(sc, IOMUXC(i), MUX_MODE_RMII);
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}
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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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