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/dev/spibus/spibus.c

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    1 /*-
    2  * Copyright (c) 2006 M. Warner Losh
    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 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/11.1/sys/dev/spibus/spibus.c 315329 2017-03-15 21:01:03Z mizhka $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/malloc.h>
   34 #include <sys/module.h>
   35 #include <sys/kernel.h>
   36 #include <sys/queue.h>
   37 #include <sys/sysctl.h>
   38 #include <sys/types.h>
   39 
   40 #include <sys/bus.h>
   41 #include <machine/bus.h>
   42 #include <sys/rman.h>
   43 #include <machine/resource.h>
   44 
   45 #include <dev/spibus/spibusvar.h>
   46 #include <dev/spibus/spi.h>
   47 #include "spibus_if.h"
   48 
   49 static int
   50 spibus_probe(device_t dev)
   51 {
   52         device_set_desc(dev, "spibus bus");
   53         return (BUS_PROBE_GENERIC);
   54 }
   55 
   56 static int
   57 spibus_attach(device_t dev)
   58 {
   59         struct spibus_softc *sc = SPIBUS_SOFTC(dev);
   60 
   61         sc->dev = dev;
   62         bus_enumerate_hinted_children(dev);
   63         return (bus_generic_attach(dev));
   64 }
   65 
   66 /*
   67  * Since this is not a self-enumerating bus, and since we always add
   68  * children in attach, we have to always delete children here.
   69  */
   70 static int
   71 spibus_detach(device_t dev)
   72 {
   73         int err, ndevs, i;
   74         device_t *devlist;
   75 
   76         if ((err = bus_generic_detach(dev)) != 0)
   77                 return (err);
   78         if ((err = device_get_children(dev, &devlist, &ndevs)) != 0)
   79                 return (err);
   80         for (i = 0; i < ndevs; i++)
   81                 device_delete_child(dev, devlist[i]);
   82         free(devlist, M_TEMP);
   83 
   84         return (0);
   85 }
   86 
   87 static int
   88 spibus_suspend(device_t dev)
   89 {
   90         return (bus_generic_suspend(dev));
   91 }
   92 
   93 static
   94 int
   95 spibus_resume(device_t dev)
   96 {
   97         return (bus_generic_resume(dev));
   98 }
   99 
  100 static int
  101 spibus_print_child(device_t dev, device_t child)
  102 {
  103         struct spibus_ivar *devi = SPIBUS_IVAR(child);
  104         int retval = 0;
  105 
  106         retval += bus_print_child_header(dev, child);
  107         retval += printf(" at cs %d", devi->cs);
  108         retval += printf(" mode %d", devi->mode);
  109         retval += bus_print_child_footer(dev, child);
  110 
  111         return (retval);
  112 }
  113 
  114 static void
  115 spibus_probe_nomatch(device_t bus, device_t child)
  116 {
  117         struct spibus_ivar *devi = SPIBUS_IVAR(child);
  118 
  119         device_printf(bus, "<unknown card> at cs %d mode %d\n", devi->cs,
  120             devi->mode);
  121         return;
  122 }
  123 
  124 static int
  125 spibus_child_location_str(device_t bus, device_t child, char *buf,
  126     size_t buflen)
  127 {
  128         struct spibus_ivar *devi = SPIBUS_IVAR(child);
  129 
  130         snprintf(buf, buflen, "cs=%d", devi->cs);
  131         return (0);
  132 }
  133 
  134 static int
  135 spibus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
  136     size_t buflen)
  137 {
  138         *buf = '\0';
  139         return (0);
  140 }
  141 
  142 static int
  143 spibus_read_ivar(device_t bus, device_t child, int which, uintptr_t *result)
  144 {
  145         struct spibus_ivar *devi = SPIBUS_IVAR(child);
  146 
  147         switch (which) {
  148         default:
  149                 return (EINVAL);
  150         case SPIBUS_IVAR_CS:
  151                 *(uint32_t *)result = devi->cs;
  152                 break;
  153         case SPIBUS_IVAR_MODE:
  154                 *(uint32_t *)result = devi->mode;
  155                 break;
  156         case SPIBUS_IVAR_CLOCK:
  157                 *(uint32_t *)result = devi->clock;
  158                 break;
  159         }
  160         return (0);
  161 }
  162 
  163 static device_t
  164 spibus_add_child(device_t dev, u_int order, const char *name, int unit)
  165 {
  166         device_t child;
  167         struct spibus_ivar *devi;
  168 
  169         child = device_add_child_ordered(dev, order, name, unit);
  170         if (child == NULL) 
  171                 return (child);
  172         devi = malloc(sizeof(struct spibus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
  173         if (devi == NULL) {
  174                 device_delete_child(dev, child);
  175                 return (0);
  176         }
  177         device_set_ivars(child, devi);
  178         return (child);
  179 }
  180 
  181 static void
  182 spibus_hinted_child(device_t bus, const char *dname, int dunit)
  183 {
  184         device_t child;
  185         struct spibus_ivar *devi;
  186 
  187         child = BUS_ADD_CHILD(bus, 0, dname, dunit);
  188         devi = SPIBUS_IVAR(child);
  189         devi->mode = SPIBUS_MODE_NONE;
  190         resource_int_value(dname, dunit, "cs", &devi->cs);
  191         resource_int_value(dname, dunit, "mode", &devi->mode);
  192 }
  193 
  194 static int
  195 spibus_transfer_impl(device_t dev, device_t child, struct spi_command *cmd)
  196 {
  197         return (SPIBUS_TRANSFER(device_get_parent(dev), child, cmd));
  198 }
  199 
  200 static device_method_t spibus_methods[] = {
  201         /* Device interface */
  202         DEVMETHOD(device_probe,         spibus_probe),
  203         DEVMETHOD(device_attach,        spibus_attach),
  204         DEVMETHOD(device_detach,        spibus_detach),
  205         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  206         DEVMETHOD(device_suspend,       spibus_suspend),
  207         DEVMETHOD(device_resume,        spibus_resume),
  208 
  209         /* Bus interface */
  210         DEVMETHOD(bus_add_child,        spibus_add_child),
  211         DEVMETHOD(bus_print_child,      spibus_print_child),
  212         DEVMETHOD(bus_probe_nomatch,    spibus_probe_nomatch),
  213         DEVMETHOD(bus_read_ivar,        spibus_read_ivar),
  214         DEVMETHOD(bus_child_pnpinfo_str, spibus_child_pnpinfo_str),
  215         DEVMETHOD(bus_child_location_str, spibus_child_location_str),
  216         DEVMETHOD(bus_hinted_child,     spibus_hinted_child),
  217 
  218         /* spibus interface */
  219         DEVMETHOD(spibus_transfer,      spibus_transfer_impl),
  220 
  221         DEVMETHOD_END
  222 };
  223 
  224 driver_t spibus_driver = {
  225         "spibus",
  226         spibus_methods,
  227         sizeof(struct spibus_softc)
  228 };
  229 
  230 devclass_t      spibus_devclass;
  231 
  232 DRIVER_MODULE(spibus, spi, spibus_driver, spibus_devclass, 0, 0);
  233 MODULE_VERSION(spibus, 1);

Cache object: 1d19aea16815fcb424e0f04ae17fc2f9


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