The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/vybrid/vf_tcon.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
    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 /*
   30  * Vybrid Family Timing Controller (TCON)
   31  * Chapter 58, Vybrid Reference Manual, Rev. 5, 07/2013
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: head/sys/arm/freescale/vybrid/vf_tcon.c 326258 2017-11-27 15:04:10Z pfg $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/bus.h>
   40 #include <sys/kernel.h>
   41 #include <sys/module.h>
   42 #include <sys/malloc.h>
   43 #include <sys/rman.h>
   44 #include <sys/timeet.h>
   45 #include <sys/timetc.h>
   46 #include <sys/watchdog.h>
   47 
   48 #include <dev/ofw/openfirm.h>
   49 #include <dev/ofw/ofw_bus.h>
   50 #include <dev/ofw/ofw_bus_subr.h>
   51 
   52 #include <machine/bus.h>
   53 #include <machine/cpu.h>
   54 #include <machine/intr.h>
   55 
   56 #include <arm/freescale/vybrid/vf_common.h>
   57 
   58 #define TCON0_CTRL1     0x00
   59 #define TCON_BYPASS     (1 << 29)
   60 
   61 struct tcon_softc {
   62         struct resource         *res[1];
   63         bus_space_tag_t         bst;
   64         bus_space_handle_t      bsh;
   65 };
   66 
   67 struct tcon_softc *tcon_sc;
   68 
   69 static struct resource_spec tcon_spec[] = {
   70         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
   71         { -1, 0 }
   72 };
   73 
   74 uint32_t
   75 tcon_bypass(void)
   76 {
   77         struct tcon_softc *sc;
   78 
   79         if (tcon_sc == NULL)
   80                 return (1);
   81 
   82         sc = tcon_sc;
   83 
   84         WRITE4(tcon_sc, TCON0_CTRL1, TCON_BYPASS);
   85 
   86         return (0);
   87 }
   88 
   89 static int
   90 tcon_probe(device_t dev)
   91 {
   92 
   93         if (!ofw_bus_status_okay(dev))
   94                 return (ENXIO);
   95 
   96         if (!ofw_bus_is_compatible(dev, "fsl,mvf600-tcon"))
   97                 return (ENXIO);
   98 
   99         device_set_desc(dev, "Vybrid Family Timing Controller (TCON)");
  100         return (BUS_PROBE_DEFAULT);
  101 }
  102 
  103 static int
  104 tcon_attach(device_t dev)
  105 {
  106         struct tcon_softc *sc;
  107 
  108         sc = device_get_softc(dev);
  109 
  110         if (bus_alloc_resources(dev, tcon_spec, sc->res)) {
  111                 device_printf(dev, "could not allocate resources\n");
  112                 return (ENXIO);
  113         }
  114 
  115         /* Memory interface */
  116         sc->bst = rman_get_bustag(sc->res[0]);
  117         sc->bsh = rman_get_bushandle(sc->res[0]);
  118 
  119         tcon_sc = sc;
  120 
  121         return (0);
  122 }
  123 
  124 static device_method_t tcon_methods[] = {
  125         DEVMETHOD(device_probe,         tcon_probe),
  126         DEVMETHOD(device_attach,        tcon_attach),
  127         { 0, 0 }
  128 };
  129 
  130 static driver_t tcon_driver = {
  131         "tcon",
  132         tcon_methods,
  133         sizeof(struct tcon_softc),
  134 };
  135 
  136 static devclass_t tcon_devclass;
  137 
  138 DRIVER_MODULE(tcon, simplebus, tcon_driver, tcon_devclass, 0, 0);

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