imx6_usbphy.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
    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 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 /*
   33  * USBPHY driver for Freescale i.MX6 family of SoCs.
   34  */
   35 
   36 #include "opt_bus.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/kernel.h>
   41 #include <sys/module.h>
   42 #include <sys/bus.h>
   43 #include <sys/rman.h>
   44 
   45 #include <dev/ofw/ofw_bus.h>
   46 #include <dev/ofw/ofw_bus_subr.h>
   47 
   48 #include <machine/bus.h>
   49 
   50 #include <arm/freescale/imx/imx_ccmvar.h>
   51 #include <arm/freescale/imx/imx6_anatopreg.h>
   52 #include <arm/freescale/imx/imx6_anatopvar.h>
   53 
   54 /*
   55  * Hardware register defines.
   56  */
   57 #define PWD_REG                         0x0000
   58 #define CTRL_STATUS_REG                 0x0030
   59 #define CTRL_SET_REG                    0x0034
   60 #define CTRL_CLR_REG                    0x0038
   61 #define CTRL_TOGGLE_REG                 0x003c
   62 #define   CTRL_SFTRST                     (1U << 31)
   63 #define   CTRL_CLKGATE                    (1 << 30)
   64 #define   CTRL_ENUTMILEVEL3               (1 << 15)
   65 #define   CTRL_ENUTMILEVEL2               (1 << 14)
   66 
   67 struct usbphy_softc {
   68         device_t        dev;
   69         struct resource *mem_res;
   70         u_int           phy_num;
   71 };
   72 
   73 static struct ofw_compat_data compat_data[] = {
   74         {"fsl,imx6q-usbphy",    true},
   75         {"fsl,imx6ul-usbphy",   true},
   76         {NULL,                  false}
   77 };
   78 
   79 static int
   80 usbphy_detach(device_t dev)
   81 {
   82         struct usbphy_softc *sc;
   83 
   84         sc = device_get_softc(dev);
   85 
   86         if (sc->mem_res != NULL)
   87                 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
   88 
   89         return (0);
   90 }
   91 
   92 static int
   93 usbphy_attach(device_t dev)
   94 {
   95         struct usbphy_softc *sc;
   96         int err, regoff, rid;
   97 
   98         sc = device_get_softc(dev);
   99         err = 0;
  100 
  101         /* Allocate bus_space resources. */
  102         rid = 0;
  103         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  104             RF_ACTIVE);
  105         if (sc->mem_res == NULL) {
  106                 device_printf(dev, "Cannot allocate memory resources\n");
  107                 err = ENXIO;
  108                 goto out;
  109         }
  110 
  111         /*
  112          * XXX Totally lame way to get the unit number (but not quite as lame as
  113          * adding an ad-hoc property to the fdt data).  This works as long as
  114          * this driver is used for imx6 only.
  115          */
  116         const uint32_t PWD_PHY1_REG_PHYSADDR = 0x020c9000;
  117         if (BUS_SPACE_PHYSADDR(sc->mem_res, 0) == PWD_PHY1_REG_PHYSADDR) {
  118                 sc->phy_num = 0;
  119                 regoff = 0;
  120         } else {
  121                 sc->phy_num = 1;
  122                 regoff = 0x60;
  123         }
  124 
  125         /*
  126          * Based on a note in the u-boot source code, disable charger detection
  127          * to avoid degrading the differential signaling on the DP line.  Note
  128          * that this disables (by design) both charger detection and contact
  129          * detection, because of the screwball mix of active-high and active-low
  130          * bits in this register.
  131          */
  132         imx6_anatop_write_4(IMX6_ANALOG_USB1_CHRG_DETECT + regoff, 
  133             IMX6_ANALOG_USB_CHRG_DETECT_N_ENABLE | 
  134             IMX6_ANALOG_USB_CHRG_DETECT_N_CHK_CHRG);
  135 
  136         imx6_anatop_write_4(IMX6_ANALOG_USB1_CHRG_DETECT + regoff, 
  137             IMX6_ANALOG_USB_CHRG_DETECT_N_ENABLE | 
  138             IMX6_ANALOG_USB_CHRG_DETECT_N_CHK_CHRG);
  139 
  140         /* XXX Configure the overcurrent detection here. */
  141 
  142         /*
  143          * Turn on the phy clocks.
  144          */
  145         imx_ccm_usbphy_enable(dev);
  146 
  147         /*
  148          * Set the software reset bit, then clear both it and the clock gate bit
  149          * to bring the device out of reset with the clock running.
  150          */
  151         bus_write_4(sc->mem_res, CTRL_SET_REG, CTRL_SFTRST);
  152         bus_write_4(sc->mem_res, CTRL_CLR_REG, CTRL_SFTRST | CTRL_CLKGATE);
  153 
  154         /* Set UTMI+ level 2+3 bits to enable low and full speed devices. */
  155         bus_write_4(sc->mem_res, CTRL_SET_REG,
  156             CTRL_ENUTMILEVEL2 | CTRL_ENUTMILEVEL3);
  157 
  158         /* Power up: clear all bits in the powerdown register. */
  159         bus_write_4(sc->mem_res, PWD_REG, 0);
  160 
  161         err = 0;
  162 
  163 out:
  164 
  165         if (err != 0)
  166                 usbphy_detach(dev);
  167 
  168         return (err);
  169 }
  170 
  171 static int
  172 usbphy_probe(device_t dev)
  173 {
  174 
  175         if (!ofw_bus_status_okay(dev))
  176                 return (ENXIO);
  177 
  178         if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
  179                 return (ENXIO);
  180 
  181         device_set_desc(dev, "Freescale i.MX6 USB PHY");
  182 
  183         return (BUS_PROBE_DEFAULT);
  184 }
  185 
  186 static device_method_t usbphy_methods[] = {
  187         /* Device interface */
  188         DEVMETHOD(device_probe,  usbphy_probe),
  189         DEVMETHOD(device_attach, usbphy_attach),
  190         DEVMETHOD(device_detach, usbphy_detach),
  191 
  192         DEVMETHOD_END
  193 };
  194 
  195 static driver_t usbphy_driver = {
  196         "usbphy",
  197         usbphy_methods,
  198         sizeof(struct usbphy_softc)
  199 };
  200 
  201 /*
  202  * This driver needs to start before the ehci driver, but later than the usual
  203  * "special" drivers like clocks and cpu.  Ehci starts at DEFAULT so SUPPORTDEV
  204  * is where this driver fits most.
  205  */
  206 EARLY_DRIVER_MODULE(usbphy, simplebus, usbphy_driver, 0, 0,
  207     BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_MIDDLE);

Cache object: 205b5bc7a75bde3e90dbae9d6ddb42b6

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FreeBSD/Linux Kernel Cross Reference sys/arm/freescale/imx/imx6_usbphy.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/imx/imx6_usbphy.c