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_dmamux.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 Direct Memory Access Multiplexer (DMAMUX)
   31  * Chapter 22, Vybrid Reference Manual, Rev. 5, 07/2013
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: head/sys/arm/freescale/vybrid/vf_dmamux.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 #include <arm/freescale/vybrid/vf_dmamux.h>
   58 
   59 #define DMAMUX_CHCFG(n)         (0x1 * n)       /* Channels 0-15 Cfg Reg */
   60 #define CHCFG_ENBL              (1 << 7)        /* Channel Enable */
   61 #define CHCFG_TRIG              (1 << 6)        /* Channel Trigger Enable */
   62 #define CHCFG_SOURCE_MASK       0x3f            /* Channel Source (Slot) */
   63 #define CHCFG_SOURCE_SHIFT      0
   64 
   65 struct dmamux_softc {
   66         struct resource         *res[4];
   67         bus_space_tag_t         bst[4];
   68         bus_space_handle_t      bsh[4];
   69 };
   70 
   71 struct dmamux_softc *dmamux_sc;
   72 
   73 static struct resource_spec dmamux_spec[] = {
   74         { SYS_RES_MEMORY,       0,      RF_ACTIVE }, /* DMAMUX0 */
   75         { SYS_RES_MEMORY,       1,      RF_ACTIVE }, /* DMAMUX1 */
   76         { SYS_RES_MEMORY,       2,      RF_ACTIVE }, /* DMAMUX2 */
   77         { SYS_RES_MEMORY,       3,      RF_ACTIVE }, /* DMAMUX3 */
   78         { -1, 0 }
   79 };
   80 
   81 static int
   82 dmamux_probe(device_t dev)
   83 {
   84 
   85         if (!ofw_bus_status_okay(dev))
   86                 return (ENXIO);
   87 
   88         if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux"))
   89                 return (ENXIO);
   90 
   91         device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer");
   92         return (BUS_PROBE_DEFAULT);
   93 }
   94 
   95 int
   96 dmamux_configure(int mux, int source, int channel, int enable)
   97 {
   98         struct dmamux_softc *sc;
   99         int reg;
  100 
  101         sc = dmamux_sc;
  102 
  103         MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0);
  104 
  105         reg = 0;
  106         if (enable)
  107                 reg |= (CHCFG_ENBL);
  108 
  109         reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT);
  110         reg |= (source << CHCFG_SOURCE_SHIFT);
  111 
  112         MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg);
  113 
  114         return (0);
  115 }
  116 
  117 static int
  118 dmamux_attach(device_t dev)
  119 {
  120         struct dmamux_softc *sc;
  121         int i;
  122 
  123         sc = device_get_softc(dev);
  124 
  125         if (bus_alloc_resources(dev, dmamux_spec, sc->res)) {
  126                 device_printf(dev, "could not allocate resources\n");
  127                 return (ENXIO);
  128         }
  129 
  130         /* Memory interface */
  131         for (i = 0; i < 4; i++) {
  132                 sc->bst[i] = rman_get_bustag(sc->res[i]);
  133                 sc->bsh[i] = rman_get_bushandle(sc->res[i]);
  134         }
  135 
  136         dmamux_sc = sc;
  137 
  138         return (0);
  139 }
  140 
  141 static device_method_t dmamux_methods[] = {
  142         DEVMETHOD(device_probe,         dmamux_probe),
  143         DEVMETHOD(device_attach,        dmamux_attach),
  144         { 0, 0 }
  145 };
  146 
  147 static driver_t dmamux_driver = {
  148         "dmamux",
  149         dmamux_methods,
  150         sizeof(struct dmamux_softc),
  151 };
  152 
  153 static devclass_t dmamux_devclass;
  154 
  155 DRIVER_MODULE(dmamux, simplebus, dmamux_driver, dmamux_devclass, 0, 0);

Cache object: 901cf3505f2eebc5ab2ca69a68f78d9c


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