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  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 2010
    5  *      Ben Gray <ben.r.gray@gmail.com>.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by Ben Gray.
   19  * 4. The name of the company nor the name of the author may be used to
   20  *    endorse or promote products derived from this software without specific
   21  *    prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY BEN GRAY ``AS IS'' AND ANY EXPRESS OR
   24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   26  * IN NO EVENT SHALL BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   28  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   29  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   31  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   32  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 /**
   36  *      SCM - System Control Module
   37  *
   38  *      Hopefully in the end this module will contain a bunch of utility functions
   39  *      for configuring and querying the general system control registers, but for
   40  *      now it only does pin(pad) multiplexing.
   41  *
   42  *      This is different from the GPIO module in that it is used to configure the
   43  *      pins between modules not just GPIO input/output.
   44  *
   45  *      This file contains the generic top level driver, however it relies on chip
   46  *      specific settings and therefore expects an array of ti_scm_padconf structs
   47  *      call ti_padconf_devmap to be located somewhere in the kernel.
   48  *
   49  */
   50 #include <sys/cdefs.h>
   51 __FBSDID("$FreeBSD: head/sys/arm/ti/ti_scm.c 326258 2017-11-27 15:04:10Z pfg $");
   52 
   53 #include <sys/param.h>
   54 #include <sys/systm.h>
   55 #include <sys/kernel.h>
   56 #include <sys/module.h>
   57 #include <sys/bus.h>
   58 #include <sys/resource.h>
   59 #include <sys/rman.h>
   60 #include <sys/lock.h>
   61 #include <sys/mutex.h>
   62 
   63 #include <machine/bus.h>
   64 #include <machine/resource.h>
   65 
   66 #include <dev/ofw/openfirm.h>
   67 #include <dev/ofw/ofw_bus.h>
   68 #include <dev/ofw/ofw_bus_subr.h>
   69 #include <dev/fdt/fdt_pinctrl.h>
   70 
   71 #include "ti_scm.h"
   72 #include "ti_cpuid.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 
   93         if (!ti_soc_is_supported())
   94                 return (ENXIO);
   95 
   96         if (!ofw_bus_status_okay(dev))
   97                 return (ENXIO);
   98 
   99         if (!ofw_bus_is_compatible(dev, "syscon"))
  100                 return (ENXIO);
  101 
  102         if (ti_scm_sc) {
  103                 return (EEXIST);
  104         }
  105 
  106         device_set_desc(dev, "TI Control Module");
  107         return (BUS_PROBE_DEFAULT);
  108 }
  109 
  110 /**
  111  *      ti_scm_attach - attaches the timer to the simplebus
  112  *      @dev: new device
  113  *
  114  *      Reserves memory and interrupt resources, stores the softc structure
  115  *      globally and registers both the timecount and eventtimer objects.
  116  *
  117  *      RETURNS
  118  *      Zero on success or ENXIO if an error occuried.
  119  */
  120 static int
  121 ti_scm_attach(device_t dev)
  122 {
  123         struct ti_scm_softc *sc = device_get_softc(dev);
  124 
  125         sc->sc_dev = dev;
  126 
  127         if (bus_alloc_resources(dev, ti_scm_res_spec, sc->sc_res)) {
  128                 device_printf(dev, "could not allocate resources\n");
  129                 return (ENXIO);
  130         }
  131 
  132         /* Global timer interface */
  133         sc->sc_bst = rman_get_bustag(sc->sc_res[0]);
  134         sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]);
  135 
  136         ti_scm_sc = sc;
  137 
  138         /* Attach platform extensions, if any. */
  139         bus_generic_probe(dev);
  140 
  141         return (bus_generic_attach(dev));
  142 }
  143 
  144 int
  145 ti_scm_reg_read_4(uint32_t reg, uint32_t *val)
  146 {
  147         if (!ti_scm_sc)
  148                 return (ENXIO);
  149 
  150         *val = ti_scm_read_4(ti_scm_sc, reg);
  151         return (0);
  152 }
  153 
  154 int
  155 ti_scm_reg_write_4(uint32_t reg, uint32_t val)
  156 {
  157         if (!ti_scm_sc)
  158                 return (ENXIO);
  159 
  160         ti_scm_write_4(ti_scm_sc, reg, val);
  161         return (0);
  162 }
  163 
  164 
  165 static device_method_t ti_scm_methods[] = {
  166         DEVMETHOD(device_probe,         ti_scm_probe),
  167         DEVMETHOD(device_attach,        ti_scm_attach),
  168 
  169         { 0, 0 }
  170 };
  171 
  172 static driver_t ti_scm_driver = {
  173         "ti_scm",
  174         ti_scm_methods,
  175         sizeof(struct ti_scm_softc),
  176 };
  177 
  178 static devclass_t ti_scm_devclass;
  179 
  180 EARLY_DRIVER_MODULE(ti_scm, simplebus, ti_scm_driver, ti_scm_devclass, 0, 0,
  181     BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);

Cache object: ca0f7cbc516c80d776c378bd90e68472


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