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/ti/ti_scm.c

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    1 /*
    2  * Copyright (c) 2010
    3  *      Ben Gray <ben.r.gray@gmail.com>.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. All advertising materials mentioning features or use of this software
   15  *    must display the following acknowledgement:
   16  *      This product includes software developed by Ben Gray.
   17  * 4. The name of the company nor the name of the author may be used to
   18  *    endorse or promote products derived from this software without specific
   19  *    prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY BEN GRAY ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   27  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   28  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   29  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   30  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 /**
   34  *      SCM - System Control Module
   35  *
   36  *      Hopefully in the end this module will contain a bunch of utility functions
   37  *      for configuring and querying the general system control registers, but for
   38  *      now it only does pin(pad) multiplexing.
   39  *
   40  *      This is different from the GPIO module in that it is used to configure the
   41  *      pins between modules not just GPIO input/output.
   42  *
   43  *      This file contains the generic top level driver, however it relies on chip
   44  *      specific settings and therefore expects an array of ti_scm_padconf structs
   45  *      call ti_padconf_devmap to be located somewhere in the kernel.
   46  *
   47  */
   48 #include <sys/cdefs.h>
   49 __FBSDID("$FreeBSD: head/sys/arm/ti/ti_scm.c 299069 2016-05-04 15:48:59Z pfg $");
   50 
   51 #include <sys/param.h>
   52 #include <sys/systm.h>
   53 #include <sys/kernel.h>
   54 #include <sys/module.h>
   55 #include <sys/bus.h>
   56 #include <sys/resource.h>
   57 #include <sys/rman.h>
   58 #include <sys/lock.h>
   59 #include <sys/mutex.h>
   60 
   61 #include <machine/bus.h>
   62 #include <machine/cpu.h>
   63 #include <machine/cpufunc.h>
   64 #include <machine/resource.h>
   65 
   66 #include <dev/fdt/fdt_common.h>
   67 #include <dev/fdt/fdt_pinctrl.h>
   68 #include <dev/ofw/openfirm.h>
   69 #include <dev/ofw/ofw_bus.h>
   70 #include <dev/ofw/ofw_bus_subr.h>
   71 
   72 #include "ti_scm.h"
   73 
   74 static struct resource_spec ti_scm_res_spec[] = {
   75         { SYS_RES_MEMORY,       0,      RF_ACTIVE },    /* Control memory window */
   76         { -1, 0 }
   77 };
   78 
   79 static struct ti_scm_softc *ti_scm_sc;
   80 
   81 #define ti_scm_read_4(sc, reg)          \
   82     bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
   83 #define ti_scm_write_4(sc, reg, val)            \
   84     bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
   85 
   86 /*
   87  * Device part of OMAP SCM driver
   88  */
   89 static int
   90 ti_scm_probe(device_t dev)
   91 {
   92         if (!ofw_bus_status_okay(dev))
   93                 return (ENXIO);
   94 
   95         if (!ofw_bus_is_compatible(dev, "syscon"))
   96                 return (ENXIO);
   97 
   98         if (ti_scm_sc) {
   99                 return (EEXIST);
  100         }
  101 
  102         device_set_desc(dev, "TI Control Module");
  103         return (BUS_PROBE_DEFAULT);
  104 }
  105 
  106 /**
  107  *      ti_scm_attach - attaches the timer to the simplebus
  108  *      @dev: new device
  109  *
  110  *      Reserves memory and interrupt resources, stores the softc structure
  111  *      globally and registers both the timecount and eventtimer objects.
  112  *
  113  *      RETURNS
  114  *      Zero on success or ENXIO if an error occuried.
  115  */
  116 static int
  117 ti_scm_attach(device_t dev)
  118 {
  119         struct ti_scm_softc *sc = device_get_softc(dev);
  120 
  121         sc->sc_dev = dev;
  122 
  123         if (bus_alloc_resources(dev, ti_scm_res_spec, sc->sc_res)) {
  124                 device_printf(dev, "could not allocate resources\n");
  125                 return (ENXIO);
  126         }
  127 
  128         /* Global timer interface */
  129         sc->sc_bst = rman_get_bustag(sc->sc_res[0]);
  130         sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]);
  131 
  132         ti_scm_sc = sc;
  133 
  134         return (0);
  135 }
  136 
  137 int
  138 ti_scm_reg_read_4(uint32_t reg, uint32_t *val)
  139 {
  140         if (!ti_scm_sc)
  141                 return (ENXIO);
  142 
  143         *val = ti_scm_read_4(ti_scm_sc, reg);
  144         return (0);
  145 }
  146 
  147 int
  148 ti_scm_reg_write_4(uint32_t reg, uint32_t val)
  149 {
  150         if (!ti_scm_sc)
  151                 return (ENXIO);
  152 
  153         ti_scm_write_4(ti_scm_sc, reg, val);
  154         return (0);
  155 }
  156 
  157 
  158 static device_method_t ti_scm_methods[] = {
  159         DEVMETHOD(device_probe,         ti_scm_probe),
  160         DEVMETHOD(device_attach,        ti_scm_attach),
  161 
  162         { 0, 0 }
  163 };
  164 
  165 static driver_t ti_scm_driver = {
  166         "ti_scm",
  167         ti_scm_methods,
  168         sizeof(struct ti_scm_softc),
  169 };
  170 
  171 static devclass_t ti_scm_devclass;
  172 
  173 EARLY_DRIVER_MODULE(ti_scm, simplebus, ti_scm_driver, ti_scm_devclass, 0, 0,
  174     BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);

Cache object: ca0f7cbc516c80d776c378bd90e68472


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