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_src.c

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    1 /*-
    2  * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 /*
   28  * Vybrid Family System Reset Controller (SRC)
   29  * Chapter 18, Vybrid Reference Manual, Rev. 5, 07/2013
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/11.2/sys/arm/freescale/vybrid/vf_src.c 331722 2018-03-29 02:50:57Z eadler $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/malloc.h>
   41 #include <sys/rman.h>
   42 #include <sys/timeet.h>
   43 #include <sys/timetc.h>
   44 #include <sys/watchdog.h>
   45 
   46 #include <dev/fdt/fdt_common.h>
   47 #include <dev/ofw/openfirm.h>
   48 #include <dev/ofw/ofw_bus.h>
   49 #include <dev/ofw/ofw_bus_subr.h>
   50 
   51 #include <machine/bus.h>
   52 #include <machine/cpu.h>
   53 #include <machine/intr.h>
   54 
   55 #include <arm/freescale/vybrid/vf_src.h>
   56 #include <arm/freescale/vybrid/vf_common.h>
   57 
   58 #define SRC_SCR         0x00    /* SRC Control Register */
   59 #define SRC_SBMR1       0x04    /* SRC Boot Mode Register 1 */
   60 #define SRC_SRSR        0x08    /* SRC Status Register */
   61 #define SRC_SECR        0x0C    /* SRC_SECR */
   62 #define SRC_SICR        0x14    /* SRC Reset Interrupt Configuration Register */
   63 #define SRC_SIMR        0x18    /* SRC Interrupt Masking Register */
   64 #define SRC_SBMR2       0x1C    /* SRC Boot Mode Register 2 */
   65 #define SRC_GPR0        0x20    /* General Purpose Register */
   66 #define SRC_GPR1        0x24    /* General Purpose Register */
   67 #define SRC_GPR2        0x28    /* General Purpose Register */
   68 #define SRC_GPR3        0x2C    /* General Purpose Register */
   69 #define SRC_GPR4        0x30    /* General Purpose Register */
   70 #define SRC_MISC0       0x4C    /* MISC0 */
   71 #define SRC_MISC1       0x50    /* MISC1 */
   72 #define SRC_MISC2       0x54    /* MISC2 */
   73 #define SRC_MISC3       0x58    /* MISC3 */
   74 
   75 struct src_softc {
   76         struct resource         *res[1];
   77         bus_space_tag_t         bst;
   78         bus_space_handle_t      bsh;
   79 };
   80 
   81 struct src_softc *src_sc;
   82 
   83 static struct resource_spec src_spec[] = {
   84         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
   85         { -1, 0 }
   86 };
   87 
   88 int
   89 src_swreset(void)
   90 {
   91 
   92         if (src_sc == NULL)
   93                 return (1);
   94 
   95         WRITE4(src_sc, SRC_SCR, SW_RST);
   96 
   97         return (0);
   98 }
   99 
  100 static int
  101 src_probe(device_t dev)
  102 {
  103 
  104         if (!ofw_bus_status_okay(dev))
  105                 return (ENXIO);
  106 
  107         if (!ofw_bus_is_compatible(dev, "fsl,mvf600-src"))
  108                 return (ENXIO);
  109 
  110         device_set_desc(dev, "Vybrid Family System Reset Controller");
  111         return (BUS_PROBE_DEFAULT);
  112 }
  113 
  114 static int
  115 src_attach(device_t dev)
  116 {
  117         struct src_softc *sc;
  118 
  119         sc = device_get_softc(dev);
  120 
  121         if (bus_alloc_resources(dev, src_spec, sc->res)) {
  122                 device_printf(dev, "could not allocate resources\n");
  123                 return (ENXIO);
  124         }
  125 
  126         /* Memory interface */
  127         sc->bst = rman_get_bustag(sc->res[0]);
  128         sc->bsh = rman_get_bushandle(sc->res[0]);
  129 
  130         src_sc = sc;
  131 
  132         return (0);
  133 }
  134 
  135 static device_method_t src_methods[] = {
  136         DEVMETHOD(device_probe,         src_probe),
  137         DEVMETHOD(device_attach,        src_attach),
  138         { 0, 0 }
  139 };
  140 
  141 static driver_t src_driver = {
  142         "src",
  143         src_methods,
  144         sizeof(struct src_softc),
  145 };
  146 
  147 static devclass_t src_devclass;
  148 
  149 DRIVER_MODULE(src, simplebus, src_driver, src_devclass, 0, 0);

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