iobus.c

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

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