nexus.c

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    1 /*-
    2  * Copyright 1998 Massachusetts Institute of Technology
    3  *
    4  * Permission to use, copy, modify, and distribute this software and
    5  * its documentation for any purpose and without fee is hereby
    6  * granted, provided that both the above copyright notice and this
    7  * permission notice appear in all copies, that both the above
    8  * copyright notice and this permission notice appear in all
    9  * supporting documentation, and that the name of M.I.T. not be used
   10  * in advertising or publicity pertaining to distribution of the
   11  * software without specific, written prior permission.  M.I.T. makes
   12  * no representations about the suitability of this software for any
   13  * purpose.  It is provided "as is" without express or implied
   14  * warranty.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  */
   30 
   31 /*
   32  * This code implements a `root nexus' for MIPS Architecture
   33  * machines.  The function of the root nexus is to serve as an
   34  * attachment point for both processors and buses, and to manage
   35  * resources which are common to all of them.  In particular,
   36  * this code implements the core resource managers for interrupt
   37  * requests and memory address space.
   38  */
   39 #include "opt_platform.h"
   40 
   41 #include <sys/cdefs.h>
   42 __FBSDID("$FreeBSD: releng/11.2/sys/mips/mips/nexus.c 308382 2016-11-06 18:40:12Z gonzo $");
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/bus.h>
   47 #include <sys/kernel.h>
   48 #include <sys/malloc.h>
   49 #include <sys/module.h>
   50 #include <sys/rman.h>
   51 #include <sys/interrupt.h>
   52 
   53 #include <vm/vm.h>
   54 #include <vm/pmap.h>
   55 
   56 #include <machine/bus.h>
   57 #include <machine/resource.h>
   58 #include <machine/vmparam.h>
   59 
   60 #ifdef INTRNG
   61 #include <machine/intr.h>
   62 #else
   63 #include <machine/intr_machdep.h>
   64 #endif
   65 
   66 #ifdef FDT
   67 #include <dev/ofw/ofw_bus_subr.h>
   68 #include <dev/ofw/openfirm.h>
   69 #include "ofw_bus_if.h"
   70 #endif
   71 
   72 #undef NEXUS_DEBUG
   73 #ifdef NEXUS_DEBUG
   74 #define dprintf printf
   75 #else 
   76 #define dprintf(x, arg...)
   77 #endif  /* NEXUS_DEBUG */
   78 
   79 #define NUM_MIPS_IRQS   6
   80 
   81 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
   82 
   83 struct nexus_device {
   84         struct resource_list    nx_resources;
   85 };
   86 
   87 #define DEVTONX(dev)    ((struct nexus_device *)device_get_ivars(dev))
   88 
   89 static struct rman irq_rman;
   90 static struct rman mem_rman;
   91 
   92 static struct resource *
   93                 nexus_alloc_resource(device_t, device_t, int, int *, rman_res_t,
   94                     rman_res_t, rman_res_t, u_int);
   95 static device_t nexus_add_child(device_t, u_int, const char *, int);
   96 static int      nexus_attach(device_t);
   97 static void     nexus_delete_resource(device_t, device_t, int, int);
   98 static struct resource_list *
   99                 nexus_get_reslist(device_t, device_t);
  100 static int      nexus_get_resource(device_t, device_t, int, int, rman_res_t *,
  101                     rman_res_t *);
  102 static int      nexus_print_child(device_t, device_t);
  103 static int      nexus_print_all_resources(device_t dev);
  104 static int      nexus_probe(device_t);
  105 static int      nexus_release_resource(device_t, device_t, int, int,
  106                     struct resource *);
  107 static int      nexus_set_resource(device_t, device_t, int, int, rman_res_t,
  108                     rman_res_t);
  109 static int      nexus_activate_resource(device_t, device_t, int, int,
  110                     struct resource *);
  111 static int      nexus_deactivate_resource(device_t, device_t, int, int,
  112                     struct resource *);
  113 static void     nexus_hinted_child(device_t, const char *, int);
  114 static int      nexus_setup_intr(device_t dev, device_t child,
  115                     struct resource *res, int flags, driver_filter_t *filt,
  116                     driver_intr_t *intr, void *arg, void **cookiep);
  117 static int      nexus_teardown_intr(device_t, device_t, struct resource *,
  118                     void *);
  119 #ifdef INTRNG
  120 #ifdef SMP
  121 static int      nexus_bind_intr(device_t, device_t, struct resource *, int);
  122 #endif
  123 #ifdef FDT
  124 static int      nexus_ofw_map_intr(device_t dev, device_t child,
  125                     phandle_t iparent, int icells, pcell_t *intr);
  126 #endif
  127 static int      nexus_describe_intr(device_t dev, device_t child,
  128                     struct resource *irq, void *cookie, const char *descr);
  129 static int      nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
  130                     enum intr_polarity pol);
  131 #endif
  132 
  133 static device_method_t nexus_methods[] = {
  134         /* Device interface */
  135         DEVMETHOD(device_probe,         nexus_probe),
  136         DEVMETHOD(device_attach,        nexus_attach),
  137 
  138         /* Bus interface */
  139         DEVMETHOD(bus_add_child,        nexus_add_child),
  140         DEVMETHOD(bus_alloc_resource,   nexus_alloc_resource),
  141         DEVMETHOD(bus_delete_resource,  nexus_delete_resource),
  142         DEVMETHOD(bus_get_resource,     nexus_get_resource),
  143         DEVMETHOD(bus_get_resource_list,        nexus_get_reslist),
  144         DEVMETHOD(bus_print_child,      nexus_print_child),
  145         DEVMETHOD(bus_release_resource, nexus_release_resource),
  146         DEVMETHOD(bus_set_resource,     nexus_set_resource),
  147         DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
  148         DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
  149         DEVMETHOD(bus_activate_resource,nexus_activate_resource),
  150         DEVMETHOD(bus_deactivate_resource,      nexus_deactivate_resource),
  151         DEVMETHOD(bus_hinted_child,     nexus_hinted_child),
  152 #ifdef INTRNG
  153         DEVMETHOD(bus_config_intr,      nexus_config_intr),
  154         DEVMETHOD(bus_describe_intr,    nexus_describe_intr),
  155 #ifdef SMP
  156         DEVMETHOD(bus_bind_intr,        nexus_bind_intr),
  157 #endif
  158 #ifdef FDT
  159         DEVMETHOD(ofw_bus_map_intr,     nexus_ofw_map_intr),
  160 #endif
  161 #endif
  162 
  163         { 0, 0 }
  164 };
  165 
  166 static driver_t nexus_driver = {
  167         "nexus",
  168         nexus_methods,
  169         1                       /* no softc */
  170 };
  171 static devclass_t nexus_devclass;
  172 
  173 static int
  174 nexus_probe(device_t dev)
  175 {
  176 
  177         device_set_desc(dev, "MIPS32 root nexus");
  178 
  179         irq_rman.rm_start = 0;
  180         irq_rman.rm_end = NUM_MIPS_IRQS - 1;
  181         irq_rman.rm_type = RMAN_ARRAY;
  182         irq_rman.rm_descr = "Hardware IRQs";
  183         if (rman_init(&irq_rman) != 0 ||
  184             rman_manage_region(&irq_rman, 0, NUM_MIPS_IRQS - 1) != 0) {
  185                 panic("%s: irq_rman", __func__);
  186         }
  187 
  188         mem_rman.rm_start = 0;
  189         mem_rman.rm_end = BUS_SPACE_MAXADDR;
  190         mem_rman.rm_type = RMAN_ARRAY;
  191         mem_rman.rm_descr = "Memory addresses";
  192         if (rman_init(&mem_rman) != 0 ||
  193             rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR) != 0) {
  194                 panic("%s: mem_rman", __func__);
  195         }
  196 
  197         return (0);
  198 }
  199 
  200 static int
  201 nexus_attach(device_t dev)
  202 {
  203 
  204         bus_generic_probe(dev);
  205         bus_enumerate_hinted_children(dev);
  206         bus_generic_attach(dev);
  207 
  208         return (0);
  209 }
  210 
  211 static int
  212 nexus_print_child(device_t bus, device_t child)
  213 {
  214         int retval = 0;
  215 
  216         retval += bus_print_child_header(bus, child);
  217         retval += nexus_print_all_resources(child);
  218         if (device_get_flags(child))
  219                 retval += printf(" flags %#x", device_get_flags(child));
  220         retval += printf(" on %s\n", device_get_nameunit(bus));
  221 
  222         return (retval);
  223 }
  224 
  225 static int
  226 nexus_print_all_resources(device_t dev)
  227 {
  228         struct nexus_device *ndev = DEVTONX(dev);
  229         struct resource_list *rl = &ndev->nx_resources;
  230         int retval = 0;
  231 
  232         if (STAILQ_FIRST(rl))
  233                 retval += printf(" at");
  234 
  235         retval += resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#jx");
  236         retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd");
  237 
  238         return (retval);
  239 }
  240 
  241 static device_t
  242 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
  243 {
  244         device_t        child;
  245         struct nexus_device *ndev;
  246 
  247         ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
  248         if (!ndev)
  249                 return (0);
  250         resource_list_init(&ndev->nx_resources);
  251 
  252         child = device_add_child_ordered(bus, order, name, unit);
  253         if (child == NULL) {
  254                 device_printf(bus, "failed to add child: %s%d\n", name, unit);
  255                 return (0);
  256         }
  257 
  258         /* should we free this in nexus_child_detached? */
  259         device_set_ivars(child, ndev);
  260 
  261         return (child);
  262 }
  263 
  264 /*
  265  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  266  * child of one of our descendants, not a direct child of nexus0.
  267  * (Exceptions include footbridge.)
  268  */
  269 static struct resource *
  270 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  271         rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
  272 {
  273         struct nexus_device             *ndev = DEVTONX(child);
  274         struct resource                 *rv;
  275         struct resource_list_entry      *rle;
  276         struct rman                     *rm;
  277         int                              isdefault, needactivate, passthrough;
  278 
  279         dprintf("%s: entry (%p, %p, %d, %p, %p, %p, %jd, %d)\n",
  280             __func__, bus, child, type, rid, (void *)(intptr_t)start,
  281             (void *)(intptr_t)end, count, flags);
  282         dprintf("%s: requested rid is %d\n", __func__, *rid);
  283 
  284         isdefault = (RMAN_IS_DEFAULT_RANGE(start, end) && count == 1);
  285         needactivate = flags & RF_ACTIVE;
  286         passthrough = (device_get_parent(child) != bus);
  287         rle = NULL;
  288 
  289         /*
  290          * If this is an allocation of the "default" range for a given RID,
  291          * and we know what the resources for this device are (ie. they aren't
  292          * maintained by a child bus), then work out the start/end values.
  293          */
  294         if (isdefault) {
  295                 rle = resource_list_find(&ndev->nx_resources, type, *rid);
  296                 if (rle == NULL)
  297                         return (NULL);
  298                 if (rle->res != NULL) {
  299                         panic("%s: resource entry is busy", __func__);
  300                 }
  301                 start = rle->start;
  302                 end = rle->end;
  303                 count = rle->count;
  304         }
  305 
  306         switch (type) {
  307         case SYS_RES_IRQ:
  308                 rm = &irq_rman;
  309                 break;
  310         case SYS_RES_MEMORY:
  311                 rm = &mem_rman;
  312                 break;
  313         default:
  314                 printf("%s: unknown resource type %d\n", __func__, type);
  315                 return (0);
  316         }
  317 
  318         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  319         if (rv == NULL) {
  320                 printf("%s: could not reserve resource for %s\n", __func__,
  321                     device_get_nameunit(child));
  322                 return (0);
  323         }
  324 
  325         rman_set_rid(rv, *rid);
  326 
  327         if (needactivate) {
  328                 if (bus_activate_resource(child, type, *rid, rv)) {
  329                         printf("%s: could not activate resource\n", __func__);
  330                         rman_release_resource(rv);
  331                         return (0);
  332                 }
  333         }
  334 
  335         return (rv);
  336 }
  337 
  338 static struct resource_list *
  339 nexus_get_reslist(device_t dev, device_t child)
  340 {
  341         struct nexus_device *ndev = DEVTONX(child);
  342 
  343         return (&ndev->nx_resources);
  344 }
  345 
  346 static int
  347 nexus_set_resource(device_t dev, device_t child, int type, int rid,
  348     rman_res_t start, rman_res_t count)
  349 {
  350         struct nexus_device             *ndev = DEVTONX(child);
  351         struct resource_list            *rl = &ndev->nx_resources;
  352         struct resource_list_entry      *rle;
  353 
  354         dprintf("%s: entry (%p, %p, %d, %d, %p, %jd)\n",
  355             __func__, dev, child, type, rid, (void *)(intptr_t)start, count);
  356 
  357         rle = resource_list_add(rl, type, rid, start, start + count - 1,
  358             count);
  359         if (rle == NULL)
  360                 return (ENXIO);
  361 
  362         return (0);
  363 }
  364 
  365 static int
  366 nexus_get_resource(device_t dev, device_t child, int type, int rid,
  367     rman_res_t *startp, rman_res_t *countp)
  368 {
  369         struct nexus_device             *ndev = DEVTONX(child);
  370         struct resource_list            *rl = &ndev->nx_resources;
  371         struct resource_list_entry      *rle;
  372 
  373         rle = resource_list_find(rl, type, rid);
  374         if (!rle)
  375                 return(ENOENT);
  376         if (startp)
  377                 *startp = rle->start;
  378         if (countp)
  379                 *countp = rle->count;
  380         return (0);
  381 }
  382 
  383 static void
  384 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
  385 {
  386         struct nexus_device     *ndev = DEVTONX(child);
  387         struct resource_list    *rl = &ndev->nx_resources;
  388 
  389         dprintf("%s: entry\n", __func__);
  390 
  391         resource_list_delete(rl, type, rid);
  392 }
  393 
  394 static int
  395 nexus_release_resource(device_t bus, device_t child, int type, int rid,
  396                        struct resource *r)
  397 {
  398         dprintf("%s: entry\n", __func__);
  399 
  400         if (rman_get_flags(r) & RF_ACTIVE) {
  401                 int error = bus_deactivate_resource(child, type, rid, r);
  402                 if (error)
  403                         return error;
  404         }
  405 
  406         return (rman_release_resource(r));
  407 }
  408 
  409 static int
  410 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
  411     struct resource *r)
  412 {
  413         void *vaddr;
  414         vm_paddr_t paddr;
  415         vm_size_t psize;
  416         int err;
  417 
  418         /*
  419          * If this is a memory resource, use pmap_mapdev to map it.
  420          */
  421         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  422                 paddr = rman_get_start(r);
  423                 psize = rman_get_size(r);
  424                 rman_set_bustag(r, mips_bus_space_generic);
  425                 err = bus_space_map(rman_get_bustag(r), paddr, psize, 0,
  426                     (bus_space_handle_t *)&vaddr);
  427                 if (err != 0) {
  428                         rman_deactivate_resource(r);
  429                         return (err);
  430                 }
  431                 rman_set_virtual(r, vaddr);
  432                 rman_set_bushandle(r, (bus_space_handle_t)(uintptr_t)vaddr);
  433         } else if (type == SYS_RES_IRQ) {
  434 #ifdef INTRNG
  435 #ifdef FDT
  436                 err = intr_activate_irq(child, r);
  437                 if (err != 0) {
  438                         rman_deactivate_resource(r);
  439                         return (err);
  440                 }
  441 #else
  442                 /*
  443                  * INTRNG without FDT needs to have the interrupt properly
  444                  * mapped first. cpu_create_intr_map() will do that and
  445                  * call intr_activate_irq() at the end.
  446                  */
  447                 cpu_create_intr_map(rman_get_start(r));
  448 #endif
  449 #endif
  450         }
  451 
  452         return (rman_activate_resource(r));
  453 }
  454 
  455 static int
  456 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  457                           struct resource *r)
  458 {
  459         bus_space_handle_t vaddr;
  460         bus_size_t psize;
  461 
  462         vaddr = rman_get_bushandle(r);
  463 
  464         if (type == SYS_RES_MEMORY && vaddr != 0) {
  465                 psize = (bus_size_t)rman_get_size(r);
  466                 bus_space_unmap(rman_get_bustag(r), vaddr, psize);
  467                 rman_set_virtual(r, NULL);
  468                 rman_set_bushandle(r, 0);
  469         } else if (type == SYS_RES_IRQ) {
  470 #ifdef INTRNG
  471                 intr_deactivate_irq(child, r);
  472 #endif
  473         }
  474 
  475         return (rman_deactivate_resource(r));
  476 }
  477 
  478 static int
  479 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
  480     driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
  481 {
  482 #ifdef INTRNG
  483         struct resource *r = res;
  484 
  485 #ifndef FDT
  486         r = cpu_get_irq_resource(rman_get_start(r));
  487 #endif
  488         return (intr_setup_irq(child, r, filt, intr, arg, flags, cookiep));
  489 #else
  490         int irq;
  491         register_t s;
  492 
  493         s = intr_disable();
  494         irq = rman_get_start(res);
  495         if (irq >= NUM_MIPS_IRQS) {
  496                 intr_restore(s);
  497                 return (0);
  498         }
  499 
  500         cpu_establish_hardintr(device_get_nameunit(child), filt, intr, arg,
  501             irq, flags, cookiep);
  502         intr_restore(s);
  503 
  504         return (0);
  505 #endif
  506 }
  507 
  508 static int
  509 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  510 {
  511 
  512 #ifdef INTRNG
  513         return (intr_teardown_irq(child, r, ih));
  514 #else
  515         printf("Unimplemented %s at %s:%d\n", __func__, __FILE__, __LINE__);
  516         return (0);
  517 #endif
  518 }
  519 
  520 #ifdef INTRNG
  521 static int
  522 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
  523     enum intr_polarity pol)
  524 {
  525 
  526         device_printf(dev, "bus_config_intr is obsolete and not supported!\n");
  527         return (EOPNOTSUPP);
  528 }
  529 
  530 static int
  531 nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
  532     void *cookie, const char *descr)
  533 {
  534 
  535         return (intr_describe_irq(child, irq, cookie, descr));
  536 }
  537 
  538 #ifdef SMP
  539 static int
  540 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
  541 {
  542 
  543         return (intr_bind_irq(child, irq, cpu));
  544 }
  545 #endif
  546 
  547 #ifdef FDT
  548 static int
  549 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
  550     pcell_t *intr)
  551 {
  552         u_int irq;
  553         struct intr_map_data_fdt *fdt_data;
  554         size_t len;
  555 
  556         len = sizeof(*fdt_data) + icells * sizeof(pcell_t);
  557         fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data(
  558             INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO);
  559         fdt_data->iparent = iparent;
  560         fdt_data->ncells = icells;
  561         memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t));
  562         irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data);
  563         return (irq);
  564 }
  565 #endif
  566 #endif /* INTRNG */
  567 
  568 static void
  569 nexus_hinted_child(device_t bus, const char *dname, int dunit)
  570 {
  571         device_t child;
  572         long    maddr;
  573         int     msize;
  574         int     order;
  575         int     result;
  576         int     irq;
  577         int     mem_hints_count;
  578 
  579         if ((resource_int_value(dname, dunit, "order", &order)) != 0)
  580                 order = 1000;
  581         child = BUS_ADD_CHILD(bus, order, dname, dunit);
  582         if (child == NULL)
  583                 return;
  584 
  585         /*
  586          * Set hard-wired resources for hinted child using
  587          * specific RIDs.
  588          */
  589         mem_hints_count = 0;
  590         if (resource_long_value(dname, dunit, "maddr", &maddr) == 0)
  591                 mem_hints_count++;
  592         if (resource_int_value(dname, dunit, "msize", &msize) == 0)
  593                 mem_hints_count++;
  594 
  595         /* check if all info for mem resource has been provided */
  596         if ((mem_hints_count > 0) && (mem_hints_count < 2)) {
  597                 printf("Either maddr or msize hint is missing for %s%d\n",
  598                     dname, dunit);
  599         } 
  600         else if (mem_hints_count) {
  601                 dprintf("%s: discovered hinted child %s at maddr %p(%d)\n",
  602                     __func__, device_get_nameunit(child),
  603                     (void *)(intptr_t)maddr, msize);
  604 
  605                 result = bus_set_resource(child, SYS_RES_MEMORY, 0,
  606                     (u_long) maddr, msize);
  607                 if (result != 0) {
  608                         device_printf(bus, 
  609                             "warning: bus_set_resource() failed\n");
  610                 }
  611         }
  612 
  613         if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
  614                 result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
  615                 if (result != 0)
  616                         device_printf(bus,
  617                             "warning: bus_set_resource() failed\n");
  618         }
  619 }
  620 
  621 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
  622     BUS_PASS_BUS + BUS_PASS_ORDER_EARLY);
Cache object: 53a332e52c500db705c78d6a9d1ab0e0
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FreeBSD/Linux Kernel Cross Reference sys/mips/mips/nexus.c

FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/nexus.c
