iobus.c

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    1 /*-
    2  * Copyright 2002 by Peter Grehan. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  * 3. The name of the author may not be used to endorse or promote products
   13  *    derived from this software without specific prior written permission.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   20  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   22  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   23  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/10.1/sys/powerpc/psim/iobus.c 266160 2014-05-15 17:30:16Z ian $
   28  */
   29 
   30 /*
   31  *  PSIM 'iobus' local bus. Should be set up in the device tree like:
   32  *
   33  *     /iobus@0x80000000/name psim-iobus
   34  *
   35  *  Code borrowed from various nexus.c and uninorth.c :-)
   36  */
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/kernel.h>
   41 #include <sys/malloc.h>
   42 #include <sys/module.h>
   43 #include <sys/bus.h>
   44 #include <machine/bus.h>
   45 #include <sys/rman.h>
   46 
   47 #include <dev/ofw/ofw_bus.h>
   48 #include <dev/ofw/openfirm.h>
   49 
   50 #include <machine/vmparam.h>
   51 #include <vm/vm.h>
   52 #include <vm/pmap.h>
   53 #include <machine/pmap.h>
   54 
   55 #include <machine/resource.h>
   56 
   57 #include <powerpc/psim/iobusvar.h>
   58 
   59 struct iobus_softc {
   60         phandle_t     sc_node;
   61         vm_offset_t   sc_addr;
   62         vm_offset_t   sc_size;
   63         struct        rman sc_mem_rman;
   64 };
   65 
   66 static MALLOC_DEFINE(M_IOBUS, "iobus", "iobus device information");
   67 
   68 static int  iobus_probe(device_t);
   69 static int  iobus_attach(device_t);
   70 static int  iobus_print_child(device_t dev, device_t child);
   71 static void iobus_probe_nomatch(device_t, device_t);
   72 static int  iobus_read_ivar(device_t, device_t, int, uintptr_t *);
   73 static int  iobus_write_ivar(device_t, device_t, int, uintptr_t);
   74 static struct   resource *iobus_alloc_resource(device_t, device_t, int, int *,
   75                                                u_long, u_long, u_long, u_int);
   76 static int  iobus_activate_resource(device_t, device_t, int, int,
   77                                     struct resource *);
   78 static int  iobus_deactivate_resource(device_t, device_t, int, int,
   79                                       struct resource *);
   80 static int  iobus_release_resource(device_t, device_t, int, int,
   81                                    struct resource *);
   82 
   83 /*
   84  * Bus interface definition
   85  */
   86 static device_method_t iobus_methods[] = {
   87         /* Device interface */
   88         DEVMETHOD(device_probe,         iobus_probe),
   89         DEVMETHOD(device_attach,        iobus_attach),
   90         DEVMETHOD(device_detach,        bus_generic_detach),
   91         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   92         DEVMETHOD(device_suspend,       bus_generic_suspend),
   93         DEVMETHOD(device_resume,        bus_generic_resume),
   94 
   95         /* Bus interface */
   96         DEVMETHOD(bus_print_child,      iobus_print_child),
   97         DEVMETHOD(bus_probe_nomatch,    iobus_probe_nomatch),
   98         DEVMETHOD(bus_read_ivar,        iobus_read_ivar),
   99         DEVMETHOD(bus_write_ivar,       iobus_write_ivar),
  100         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  101         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  102 
  103         DEVMETHOD(bus_alloc_resource,   iobus_alloc_resource),
  104         DEVMETHOD(bus_release_resource, iobus_release_resource),
  105         DEVMETHOD(bus_activate_resource, iobus_activate_resource),
  106         DEVMETHOD(bus_deactivate_resource, iobus_deactivate_resource),
  107 
  108         { 0, 0 }
  109 };
  110 
  111 static driver_t iobus_driver = {
  112         "iobus",
  113         iobus_methods,
  114         sizeof(struct iobus_softc)
  115 };
  116 
  117 devclass_t iobus_devclass;
  118 
  119 DRIVER_MODULE(iobus, ofwbus, iobus_driver, iobus_devclass, 0, 0);
  120 
  121 static int
  122 iobus_probe(device_t dev)
  123 {
  124         const char *type = ofw_bus_get_name(dev);
  125 
  126         if (strcmp(type, "psim-iobus") != 0)
  127                 return (ENXIO);
  128 
  129         device_set_desc(dev, "PSIM local bus");
  130         return (0);     
  131 }
  132 
  133 /*
  134  * Add interrupt/addr range to the dev's resource list if present
  135  */
  136 static void
  137 iobus_add_intr(phandle_t devnode, struct iobus_devinfo *dinfo)
  138 {
  139         u_int intr = -1;
  140 
  141         if (OF_getprop(devnode, "interrupt", &intr, sizeof(intr)) != -1) {
  142                 resource_list_add(&dinfo->id_resources, 
  143                                   SYS_RES_IRQ, 0, intr, intr, 1);
  144         }
  145         dinfo->id_interrupt = intr;
  146 }
  147 
  148 
  149 static void
  150 iobus_add_reg(phandle_t devnode, struct iobus_devinfo *dinfo,
  151               vm_offset_t iobus_off)
  152 {
  153         u_int size;
  154         int i;
  155 
  156         size = OF_getprop(devnode, "reg", dinfo->id_reg,sizeof(dinfo->id_reg));
  157 
  158         if (size != -1) {
  159                 dinfo->id_nregs = size / (sizeof(dinfo->id_reg[0]));
  160 
  161                 for (i = 0; i < dinfo->id_nregs; i+= 3) {
  162                         /*
  163                          * Scale the absolute addresses back to iobus
  164                          * relative offsets. This is to better simulate
  165                          * macio
  166                          */
  167                         dinfo->id_reg[i+1] -= iobus_off;
  168 
  169                         resource_list_add(&dinfo->id_resources,
  170                                           SYS_RES_MEMORY, 0,
  171                                           dinfo->id_reg[i+1], 
  172                                           dinfo->id_reg[i+1] + 
  173                                               dinfo->id_reg[i+2],
  174                                           dinfo->id_reg[i+2]);
  175                 }
  176         }
  177 }
  178 
  179 
  180 static int
  181 iobus_attach(device_t dev)
  182 {
  183         struct iobus_softc *sc;
  184         struct iobus_devinfo *dinfo;
  185         phandle_t  root;
  186         phandle_t  child;
  187         device_t   cdev;
  188         char *name;
  189         u_int reg[2];
  190         int size;
  191 
  192         sc = device_get_softc(dev);
  193         sc->sc_node = ofw_bus_get_node(dev);
  194 
  195         /*
  196          * Find the base addr/size of the iobus, and initialize the
  197          * resource manager
  198          */
  199         size = OF_getprop(sc->sc_node, "reg", reg, sizeof(reg));
  200         if (size == sizeof(reg)) {
  201                 sc->sc_addr = reg[0];
  202                 sc->sc_size = reg[1];
  203         } else {
  204                 return (ENXIO);
  205         }
  206 
  207         sc->sc_mem_rman.rm_type = RMAN_ARRAY;
  208         sc->sc_mem_rman.rm_descr = "IOBus Device Memory";
  209         if (rman_init(&sc->sc_mem_rman) != 0) {
  210                 device_printf(dev,
  211                     "failed to init mem range resources\n");
  212                 return (ENXIO);
  213         }
  214         rman_manage_region(&sc->sc_mem_rman, 0, sc->sc_size);
  215 
  216         /*
  217          * Iterate through the sub-devices
  218          */
  219         root = sc->sc_node;
  220 
  221         for (child = OF_child(root); child != 0; child = OF_peer(child)) {
  222                 OF_getprop_alloc(child, "name", 1, (void **)&name);
  223 
  224                 cdev = device_add_child(dev, NULL, -1);
  225                 if (cdev != NULL) {
  226                         dinfo = malloc(sizeof(*dinfo), M_IOBUS, M_WAITOK);
  227                         memset(dinfo, 0, sizeof(*dinfo));
  228                         resource_list_init(&dinfo->id_resources);
  229                         dinfo->id_node = child;
  230                         dinfo->id_name = name;
  231                         iobus_add_intr(child, dinfo);
  232                         iobus_add_reg(child, dinfo, sc->sc_addr);
  233                         device_set_ivars(cdev, dinfo);
  234                 } else {
  235                         free(name, M_OFWPROP);
  236                 }
  237         }
  238 
  239         return (bus_generic_attach(dev));
  240 }
  241 
  242 
  243 static int
  244 iobus_print_child(device_t dev, device_t child)
  245 {
  246         struct iobus_devinfo *dinfo;
  247         struct resource_list *rl;
  248         int retval = 0;
  249         
  250         dinfo = device_get_ivars(child);
  251         rl = &dinfo->id_resources;
  252 
  253         retval += bus_print_child_header(dev, child);
  254         
  255         retval += printf(" offset 0x%x", dinfo->id_reg[1]);
  256         retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
  257         
  258         retval += bus_print_child_footer(dev, child);
  259 
  260         return (retval);        
  261 }
  262 
  263 
  264 static void
  265 iobus_probe_nomatch(device_t dev, device_t child)
  266 {
  267 }
  268 
  269 
  270 static int
  271 iobus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  272 {
  273         struct iobus_devinfo *dinfo;
  274 
  275         if ((dinfo = device_get_ivars(child)) == 0)
  276                 return (ENOENT);
  277 
  278         switch (which) {
  279         case IOBUS_IVAR_NODE:
  280                 *result = dinfo->id_node;
  281                 break;
  282         case IOBUS_IVAR_NAME:
  283                 *result = (uintptr_t)dinfo->id_name;
  284                 break;
  285         case IOBUS_IVAR_NREGS:
  286                 *result = dinfo->id_nregs;
  287                 break;
  288         case IOBUS_IVAR_REGS:
  289                 *result = (uintptr_t)dinfo->id_reg;
  290                 break;
  291         default:
  292                 return (ENOENT);
  293         }
  294 
  295         return (0);
  296 }
  297 
  298 
  299 static int
  300 iobus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  301 {
  302         return (EINVAL);
  303 }
  304 
  305 
  306 static struct resource *
  307 iobus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  308                      u_long start, u_long end, u_long count, u_int flags)
  309 {
  310         struct iobus_softc *sc;
  311         int  needactivate;
  312         struct  resource *rv;
  313         struct  rman *rm;
  314 
  315         sc = device_get_softc(bus);
  316 
  317         needactivate = flags & RF_ACTIVE;
  318         flags &= ~RF_ACTIVE;
  319 
  320         switch (type) {
  321         case SYS_RES_MEMORY:
  322         case SYS_RES_IOPORT:
  323                 rm = &sc->sc_mem_rman;
  324                 break;
  325         case SYS_RES_IRQ:
  326                 return (bus_alloc_resource(bus, type, rid, start, end, count,
  327                     flags));
  328         default:
  329                 device_printf(bus, "unknown resource request from %s\n",
  330                     device_get_nameunit(child));
  331                 return (NULL);
  332         }
  333 
  334         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  335         if (rv == NULL) {
  336                 device_printf(bus, "failed to reserve resource for %s\n",
  337                               device_get_nameunit(child));
  338                 return (NULL);
  339         }
  340 
  341         rman_set_rid(rv, *rid);
  342 
  343         if (needactivate) {
  344                 if (bus_activate_resource(child, type, *rid, rv) != 0) {
  345                         device_printf(bus,
  346                                       "failed to activate resource for %s\n",
  347                                       device_get_nameunit(child));
  348                         rman_release_resource(rv);
  349                         return (NULL);
  350                 }
  351         }
  352 
  353         return (rv);    
  354 }
  355 
  356 
  357 static int
  358 iobus_release_resource(device_t bus, device_t child, int type, int rid,
  359                        struct resource *res)
  360 {
  361         if (rman_get_flags(res) & RF_ACTIVE) {
  362                 int error = bus_deactivate_resource(child, type, rid, res);
  363                 if (error)
  364                         return error;
  365         }
  366 
  367         return (rman_release_resource(res));
  368 }
  369 
  370 
  371 static int
  372 iobus_activate_resource(device_t bus, device_t child, int type, int rid,
  373                            struct resource *res)
  374 {
  375         struct iobus_softc *sc;
  376         void    *p;
  377 
  378         sc = device_get_softc(bus);
  379 
  380         if (type == SYS_RES_IRQ)
  381                 return (bus_activate_resource(bus, type, rid, res));
  382 
  383         if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
  384                 p = pmap_mapdev((vm_offset_t)rman_get_start(res) + sc->sc_addr,
  385                                 (vm_size_t)rman_get_size(res));
  386                 if (p == NULL)
  387                         return (ENOMEM);
  388                 rman_set_virtual(res, p);
  389                 rman_set_bustag(res, &bs_le_tag);
  390                 rman_set_bushandle(res, (u_long)p);
  391         }
  392 
  393         return (rman_activate_resource(res));
  394 }
  395 
  396 
  397 static int
  398 iobus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  399                           struct resource *res)
  400 {
  401         /*
  402          * If this is a memory resource, unmap it.
  403          */
  404         if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
  405                 u_int32_t psize;
  406 
  407                 psize = rman_get_size(res);
  408                 pmap_unmapdev((vm_offset_t)rman_get_virtual(res), psize);
  409         }
  410 
  411         return (rman_deactivate_resource(res));
  412 }
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FreeBSD/Linux Kernel Cross Reference sys/powerpc/psim/iobus.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/psim/iobus.c
