210 lines
5.6 KiB
C
210 lines
5.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* USBPHY driver for Freescale i.MX6 family of SoCs.
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*/
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#include "opt_bus.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/rman.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 <arm/freescale/imx/imx_ccmvar.h>
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#include <arm/freescale/imx/imx6_anatopreg.h>
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#include <arm/freescale/imx/imx6_anatopvar.h>
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/*
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* Hardware register defines.
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*/
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#define PWD_REG 0x0000
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#define CTRL_STATUS_REG 0x0030
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#define CTRL_SET_REG 0x0034
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#define CTRL_CLR_REG 0x0038
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#define CTRL_TOGGLE_REG 0x003c
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#define CTRL_SFTRST (1U << 31)
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#define CTRL_CLKGATE (1 << 30)
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#define CTRL_ENUTMILEVEL3 (1 << 15)
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#define CTRL_ENUTMILEVEL2 (1 << 14)
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struct usbphy_softc {
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device_t dev;
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struct resource *mem_res;
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u_int phy_num;
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};
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static struct ofw_compat_data compat_data[] = {
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{"fsl,imx6q-usbphy", true},
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{"fsl,imx6ul-usbphy", true},
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{NULL, false}
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};
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static int
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usbphy_detach(device_t dev)
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{
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struct usbphy_softc *sc;
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sc = device_get_softc(dev);
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if (sc->mem_res != NULL)
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bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
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return (0);
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}
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static int
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usbphy_attach(device_t dev)
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{
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struct usbphy_softc *sc;
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int err, regoff, rid;
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sc = device_get_softc(dev);
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err = 0;
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/* Allocate bus_space resources. */
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rid = 0;
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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RF_ACTIVE);
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if (sc->mem_res == NULL) {
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device_printf(dev, "Cannot allocate memory resources\n");
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err = ENXIO;
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goto out;
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}
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/*
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* XXX Totally lame way to get the unit number (but not quite as lame as
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* adding an ad-hoc property to the fdt data). This works as long as
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* this driver is used for imx6 only.
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*/
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const uint32_t PWD_PHY1_REG_PHYSADDR = 0x020c9000;
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if (BUS_SPACE_PHYSADDR(sc->mem_res, 0) == PWD_PHY1_REG_PHYSADDR) {
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sc->phy_num = 0;
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regoff = 0;
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} else {
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sc->phy_num = 1;
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regoff = 0x60;
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}
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/*
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* Based on a note in the u-boot source code, disable charger detection
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* to avoid degrading the differential signaling on the DP line. Note
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* that this disables (by design) both charger detection and contact
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* detection, because of the screwball mix of active-high and active-low
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* bits in this register.
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*/
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imx6_anatop_write_4(IMX6_ANALOG_USB1_CHRG_DETECT + regoff,
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IMX6_ANALOG_USB_CHRG_DETECT_N_ENABLE |
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IMX6_ANALOG_USB_CHRG_DETECT_N_CHK_CHRG);
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imx6_anatop_write_4(IMX6_ANALOG_USB1_CHRG_DETECT + regoff,
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IMX6_ANALOG_USB_CHRG_DETECT_N_ENABLE |
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IMX6_ANALOG_USB_CHRG_DETECT_N_CHK_CHRG);
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/* XXX Configure the overcurrent detection here. */
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/*
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* Turn on the phy clocks.
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*/
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imx_ccm_usbphy_enable(dev);
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/*
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* Set the software reset bit, then clear both it and the clock gate bit
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* to bring the device out of reset with the clock running.
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*/
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bus_write_4(sc->mem_res, CTRL_SET_REG, CTRL_SFTRST);
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bus_write_4(sc->mem_res, CTRL_CLR_REG, CTRL_SFTRST | CTRL_CLKGATE);
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/* Set UTMI+ level 2+3 bits to enable low and full speed devices. */
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bus_write_4(sc->mem_res, CTRL_SET_REG,
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CTRL_ENUTMILEVEL2 | CTRL_ENUTMILEVEL3);
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/* Power up: clear all bits in the powerdown register. */
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bus_write_4(sc->mem_res, PWD_REG, 0);
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err = 0;
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out:
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if (err != 0)
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usbphy_detach(dev);
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return (err);
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}
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static int
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usbphy_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_search_compatible(dev, compat_data)->ocd_data)
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return (ENXIO);
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device_set_desc(dev, "Freescale i.MX6 USB PHY");
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return (BUS_PROBE_DEFAULT);
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}
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static device_method_t usbphy_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, usbphy_probe),
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DEVMETHOD(device_attach, usbphy_attach),
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DEVMETHOD(device_detach, usbphy_detach),
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DEVMETHOD_END
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};
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static driver_t usbphy_driver = {
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"usbphy",
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usbphy_methods,
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sizeof(struct usbphy_softc)
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};
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static devclass_t usbphy_devclass;
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/*
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* This driver needs to start before the ehci driver, but later than the usual
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* "special" drivers like clocks and cpu. Ehci starts at DEFAULT so SUPPORTDEV
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* is where this driver fits most.
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*/
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EARLY_DRIVER_MODULE(usbphy, simplebus, usbphy_driver, usbphy_devclass, 0, 0,
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BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_MIDDLE);
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