generic_ehci_fdt.c

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    1 /*-
    2  * Copyright (c) 2012 Ganbold Tsagaankhuu <ganbold@freebsd.org>
    3  * Copyright (c) 2016 The FreeBSD Foundation
    4  * All rights reserved.
    5  *
    6  * This software was developed by Andrew Turner under
    7  * sponsorship from the FreeBSD Foundation.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include "opt_bus.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/bus.h>
   39 #include <sys/condvar.h>
   40 #include <sys/kernel.h>
   41 #include <sys/module.h>
   42 
   43 #include <dev/usb/usb.h>
   44 #include <dev/usb/usbdi.h>
   45 
   46 #include <dev/usb/usb_core.h>
   47 #include <dev/usb/usb_busdma.h>
   48 #include <dev/usb/usb_process.h>
   49 
   50 #include <dev/usb/usb_controller.h>
   51 #include <dev/usb/usb_bus.h>
   52 #include <dev/usb/controller/ehci.h>
   53 
   54 #include <dev/fdt/fdt_common.h>
   55 #include <dev/ofw/openfirm.h>
   56 #include <dev/ofw/ofw_bus.h>
   57 #include <dev/ofw/ofw_bus_subr.h>
   58 
   59 #include <dev/extres/clk/clk.h>
   60 #include <dev/extres/hwreset/hwreset.h>
   61 #include <dev/extres/phy/phy.h>
   62 #include <dev/extres/phy/phy_usb.h>
   63 
   64 #include "generic_ehci.h"
   65 
   66 struct clk_list {
   67         TAILQ_ENTRY(clk_list)   next;
   68         clk_t                   clk;
   69 };
   70 
   71 struct hwrst_list {
   72         TAILQ_ENTRY(hwrst_list) next;
   73         hwreset_t               rst;
   74 };
   75 
   76 struct phy_list {
   77         TAILQ_ENTRY(phy_list)   next;
   78         phy_t                   phy;
   79 };
   80 
   81 struct generic_ehci_fdt_softc {
   82         ehci_softc_t    ehci_sc;
   83 
   84         TAILQ_HEAD(, clk_list)  clk_list;
   85         TAILQ_HEAD(, hwrst_list)        rst_list;
   86         TAILQ_HEAD(, phy_list)          phy_list;
   87 };
   88 
   89 static device_probe_t generic_ehci_fdt_probe;
   90 static device_attach_t generic_ehci_fdt_attach;
   91 static device_detach_t generic_ehci_fdt_detach;
   92 
   93 static int
   94 generic_ehci_fdt_probe(device_t self)
   95 {
   96 
   97         if (!ofw_bus_status_okay(self))
   98                 return (ENXIO);
   99 
  100         if (!ofw_bus_is_compatible(self, "generic-ehci"))
  101                 return (ENXIO);
  102 
  103         device_set_desc(self, "Generic EHCI Controller");
  104         return (BUS_PROBE_DEFAULT);
  105 }
  106 
  107 static int
  108 generic_ehci_fdt_attach(device_t dev)
  109 {
  110         int err;
  111         struct generic_ehci_fdt_softc *sc;
  112         struct clk_list *clkp;
  113         clk_t clk;
  114         struct hwrst_list *rstp;
  115         hwreset_t rst;
  116         struct phy_list *phyp;
  117         phy_t phy;
  118         int off;
  119 
  120         sc = device_get_softc(dev);
  121 
  122         TAILQ_INIT(&sc->clk_list);
  123         /* Enable clock */
  124         for (off = 0; clk_get_by_ofw_index(dev, 0, off, &clk) == 0; off++) {
  125                 err = clk_enable(clk);
  126                 if (err != 0) {
  127                         device_printf(dev, "Could not enable clock %s\n",
  128                             clk_get_name(clk));
  129                         goto error;
  130                 }
  131                 clkp = malloc(sizeof(*clkp), M_DEVBUF, M_WAITOK | M_ZERO);
  132                 clkp->clk = clk;
  133                 TAILQ_INSERT_TAIL(&sc->clk_list, clkp, next);
  134         }
  135 
  136         /* De-assert reset */
  137         TAILQ_INIT(&sc->rst_list);
  138         for (off = 0; hwreset_get_by_ofw_idx(dev, 0, off, &rst) == 0; off++) {
  139                 err = hwreset_deassert(rst);
  140                 if (err != 0) {
  141                         device_printf(dev, "Could not de-assert reset\n");
  142                         goto error;
  143                 }
  144                 rstp = malloc(sizeof(*rstp), M_DEVBUF, M_WAITOK | M_ZERO);
  145                 rstp->rst = rst;
  146                 TAILQ_INSERT_TAIL(&sc->rst_list, rstp, next);
  147         }
  148 
  149         /* Enable USB PHY */
  150         TAILQ_INIT(&sc->phy_list);
  151         for (off = 0; phy_get_by_ofw_idx(dev, 0, off, &phy) == 0; off++) {
  152                 err = phy_usb_set_mode(phy, PHY_USB_MODE_HOST);
  153                 if (err != 0) {
  154                         device_printf(dev, "Could not set phy to host mode\n");
  155                         goto error;
  156                 }
  157                 err = phy_enable(phy);
  158                 if (err != 0) {
  159                         device_printf(dev, "Could not enable phy\n");
  160                         goto error;
  161                 }
  162                 phyp = malloc(sizeof(*phyp), M_DEVBUF, M_WAITOK | M_ZERO);
  163                 phyp->phy = phy;
  164                 TAILQ_INSERT_TAIL(&sc->phy_list, phyp, next);
  165         }
  166 
  167         err = generic_ehci_attach(dev);
  168         if (err != 0)
  169                 goto error;
  170 
  171         return (0);
  172 
  173 error:
  174         generic_ehci_fdt_detach(dev);
  175         return (err);
  176 }
  177 
  178 static int
  179 generic_ehci_fdt_detach(device_t dev)
  180 {
  181         struct generic_ehci_fdt_softc *sc;
  182         struct clk_list *clk, *clk_tmp;
  183         struct hwrst_list *rst, *rst_tmp;
  184         struct phy_list *phy, *phy_tmp;
  185         int err;
  186 
  187         err = generic_ehci_detach(dev);
  188         if (err != 0)
  189                 return (err);
  190 
  191         sc = device_get_softc(dev);
  192 
  193         /* Disable clock */
  194         TAILQ_FOREACH_SAFE(clk, &sc->clk_list, next, clk_tmp) {
  195                 err = clk_disable(clk->clk);
  196                 if (err != 0)
  197                         device_printf(dev, "Could not disable clock %s\n",
  198                             clk_get_name(clk->clk));
  199                 err = clk_release(clk->clk);
  200                 if (err != 0)
  201                         device_printf(dev, "Could not release clock %s\n",
  202                             clk_get_name(clk->clk));
  203                 TAILQ_REMOVE(&sc->clk_list, clk, next);
  204                 free(clk, M_DEVBUF);
  205         }
  206 
  207         /* Assert reset */
  208         TAILQ_FOREACH_SAFE(rst, &sc->rst_list, next, rst_tmp) {
  209                 hwreset_assert(rst->rst);
  210                 hwreset_release(rst->rst);
  211                 TAILQ_REMOVE(&sc->rst_list, rst, next);
  212                 free(rst, M_DEVBUF);
  213         }
  214 
  215         /* Disable phys */
  216         TAILQ_FOREACH_SAFE(phy, &sc->phy_list, next, phy_tmp) {
  217                 err = phy_disable(phy->phy);
  218                 if (err != 0)
  219                         device_printf(dev, "Could not disable phy\n");
  220                 phy_release(phy->phy);
  221                 TAILQ_REMOVE(&sc->phy_list, phy, next);
  222                 free(phy, M_DEVBUF);
  223         }
  224 
  225         return (0);
  226 }
  227 
  228 static device_method_t ehci_fdt_methods[] = {
  229         /* Device interface */
  230         DEVMETHOD(device_probe,         generic_ehci_fdt_probe),
  231         DEVMETHOD(device_attach,        generic_ehci_fdt_attach),
  232         DEVMETHOD(device_detach,        generic_ehci_fdt_detach),
  233 
  234         DEVMETHOD_END
  235 };
  236 
  237 DEFINE_CLASS_1(ehci, ehci_fdt_driver, ehci_fdt_methods,
  238     sizeof(ehci_softc_t), generic_ehci_driver);
  239 
  240 DRIVER_MODULE(generic_ehci, simplebus, ehci_fdt_driver, 0, 0);
  241 MODULE_DEPEND(generic_ehci, usb, 1, 1, 1);

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FreeBSD/Linux Kernel Cross Reference sys/dev/usb/controller/generic_ehci_fdt.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/controller/generic_ehci_fdt.c