The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/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: stable/12/sys/mips/mips/nexus.c 326043 2017-11-21 01:54:48Z landonf $");
   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 #ifdef INTRNG
   80 #define NUM_MIPS_IRQS   NIRQ    /* Any INTRNG-mapped IRQ */
   81 #else
   82 #define NUM_MIPS_IRQS   6       /* HW IRQs only */
   83 #endif
   84 
   85 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
   86 
   87 struct nexus_device {
   88         struct resource_list    nx_resources;
   89 };
   90 
   91 #define DEVTONX(dev)    ((struct nexus_device *)device_get_ivars(dev))
   92 
   93 static struct rman irq_rman;
   94 static struct rman mem_rman;
   95 
   96 static struct resource *
   97                 nexus_alloc_resource(device_t, device_t, int, int *, rman_res_t,
   98                     rman_res_t, rman_res_t, u_int);
   99 static device_t nexus_add_child(device_t, u_int, const char *, int);
  100 static int      nexus_attach(device_t);
  101 static void     nexus_delete_resource(device_t, device_t, int, int);
  102 static struct resource_list *
  103                 nexus_get_reslist(device_t, device_t);
  104 static int      nexus_get_resource(device_t, device_t, int, int, rman_res_t *,
  105                     rman_res_t *);
  106 static int      nexus_print_child(device_t, device_t);
  107 static int      nexus_print_all_resources(device_t dev);
  108 static int      nexus_probe(device_t);
  109 static int      nexus_release_resource(device_t, device_t, int, int,
  110                     struct resource *);
  111 static int      nexus_set_resource(device_t, device_t, int, int, rman_res_t,
  112                     rman_res_t);
  113 static int      nexus_activate_resource(device_t, device_t, int, int,
  114                     struct resource *);
  115 static int      nexus_deactivate_resource(device_t, device_t, int, int,
  116                     struct resource *);
  117 static void     nexus_hinted_child(device_t, const char *, int);
  118 static int      nexus_setup_intr(device_t dev, device_t child,
  119                     struct resource *res, int flags, driver_filter_t *filt,
  120                     driver_intr_t *intr, void *arg, void **cookiep);
  121 static int      nexus_teardown_intr(device_t, device_t, struct resource *,
  122                     void *);
  123 #ifdef INTRNG
  124 #ifdef SMP
  125 static int      nexus_bind_intr(device_t, device_t, struct resource *, int);
  126 #endif
  127 #ifdef FDT
  128 static int      nexus_ofw_map_intr(device_t dev, device_t child,
  129                     phandle_t iparent, int icells, pcell_t *intr);
  130 #endif
  131 static int      nexus_describe_intr(device_t dev, device_t child,
  132                     struct resource *irq, void *cookie, const char *descr);
  133 static int      nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
  134                     enum intr_polarity pol);
  135 #endif
  136 
  137 static device_method_t nexus_methods[] = {
  138         /* Device interface */
  139         DEVMETHOD(device_probe,         nexus_probe),
  140         DEVMETHOD(device_attach,        nexus_attach),
  141 
  142         /* Bus interface */
  143         DEVMETHOD(bus_add_child,        nexus_add_child),
  144         DEVMETHOD(bus_alloc_resource,   nexus_alloc_resource),
  145         DEVMETHOD(bus_delete_resource,  nexus_delete_resource),
  146         DEVMETHOD(bus_get_resource,     nexus_get_resource),
  147         DEVMETHOD(bus_get_resource_list,        nexus_get_reslist),
  148         DEVMETHOD(bus_print_child,      nexus_print_child),
  149         DEVMETHOD(bus_release_resource, nexus_release_resource),
  150         DEVMETHOD(bus_set_resource,     nexus_set_resource),
  151         DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
  152         DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
  153         DEVMETHOD(bus_activate_resource,nexus_activate_resource),
  154         DEVMETHOD(bus_deactivate_resource,      nexus_deactivate_resource),
  155         DEVMETHOD(bus_hinted_child,     nexus_hinted_child),
  156 #ifdef INTRNG
  157         DEVMETHOD(bus_config_intr,      nexus_config_intr),
  158         DEVMETHOD(bus_describe_intr,    nexus_describe_intr),
  159 #ifdef SMP
  160         DEVMETHOD(bus_bind_intr,        nexus_bind_intr),
  161 #endif
  162 #ifdef FDT
  163         DEVMETHOD(ofw_bus_map_intr,     nexus_ofw_map_intr),
  164 #endif
  165 #endif
  166 
  167         { 0, 0 }
  168 };
  169 
  170 static driver_t nexus_driver = {
  171         "nexus",
  172         nexus_methods,
  173         1                       /* no softc */
  174 };
  175 static devclass_t nexus_devclass;
  176 
  177 static int
  178 nexus_probe(device_t dev)
  179 {
  180 
  181         device_set_desc(dev, "MIPS32 root nexus");
  182 
  183         irq_rman.rm_start = 0;
  184         irq_rman.rm_end = NUM_MIPS_IRQS - 1;
  185         irq_rman.rm_type = RMAN_ARRAY;
  186         irq_rman.rm_descr = "Hardware IRQs";
  187         if (rman_init(&irq_rman) != 0 ||
  188             rman_manage_region(&irq_rman, 0, NUM_MIPS_IRQS - 1) != 0) {
  189                 panic("%s: irq_rman", __func__);
  190         }
  191 
  192         mem_rman.rm_start = 0;
  193         mem_rman.rm_end = BUS_SPACE_MAXADDR;
  194         mem_rman.rm_type = RMAN_ARRAY;
  195         mem_rman.rm_descr = "Memory addresses";
  196         if (rman_init(&mem_rman) != 0 ||
  197             rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR) != 0) {
  198                 panic("%s: mem_rman", __func__);
  199         }
  200 
  201         return (0);
  202 }
  203 
  204 static int
  205 nexus_attach(device_t dev)
  206 {
  207 #if defined(INTRNG) && !defined(FDT)
  208         int error;
  209 
  210         if ((error = mips_pic_map_fixed_intrs()))
  211                 return (error);
  212 #endif
  213 
  214         bus_generic_probe(dev);
  215         bus_enumerate_hinted_children(dev);
  216         bus_generic_attach(dev);
  217 
  218         return (0);
  219 }
  220 
  221 static int
  222 nexus_print_child(device_t bus, device_t child)
  223 {
  224         int retval = 0;
  225 
  226         retval += bus_print_child_header(bus, child);
  227         retval += nexus_print_all_resources(child);
  228         if (device_get_flags(child))
  229                 retval += printf(" flags %#x", device_get_flags(child));
  230         retval += printf(" on %s\n", device_get_nameunit(bus));
  231 
  232         return (retval);
  233 }
  234 
  235 static int
  236 nexus_print_all_resources(device_t dev)
  237 {
  238         struct nexus_device *ndev = DEVTONX(dev);
  239         struct resource_list *rl = &ndev->nx_resources;
  240         int retval = 0;
  241 
  242         if (STAILQ_FIRST(rl))
  243                 retval += printf(" at");
  244 
  245         retval += resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#jx");
  246         retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd");
  247 
  248         return (retval);
  249 }
  250 
  251 static device_t
  252 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
  253 {
  254         device_t        child;
  255         struct nexus_device *ndev;
  256 
  257         ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
  258         if (!ndev)
  259                 return (0);
  260         resource_list_init(&ndev->nx_resources);
  261 
  262         child = device_add_child_ordered(bus, order, name, unit);
  263         if (child == NULL) {
  264                 device_printf(bus, "failed to add child: %s%d\n", name, unit);
  265                 return (0);
  266         }
  267 
  268         /* should we free this in nexus_child_detached? */
  269         device_set_ivars(child, ndev);
  270 
  271         return (child);
  272 }
  273 
  274 /*
  275  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  276  * child of one of our descendants, not a direct child of nexus0.
  277  * (Exceptions include footbridge.)
  278  */
  279 static struct resource *
  280 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  281         rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
  282 {
  283         struct nexus_device             *ndev = DEVTONX(child);
  284         struct resource                 *rv;
  285         struct resource_list_entry      *rle;
  286         struct rman                     *rm;
  287         int                              isdefault, needactivate, passthrough;
  288 
  289         dprintf("%s: entry (%p, %p, %d, %p, %p, %p, %jd, %d)\n",
  290             __func__, bus, child, type, rid, (void *)(intptr_t)start,
  291             (void *)(intptr_t)end, count, flags);
  292         dprintf("%s: requested rid is %d\n", __func__, *rid);
  293 
  294         isdefault = (RMAN_IS_DEFAULT_RANGE(start, end) && count == 1);
  295         needactivate = flags & RF_ACTIVE;
  296         passthrough = (device_get_parent(child) != bus);
  297         rle = NULL;
  298 
  299         /*
  300          * If this is an allocation of the "default" range for a given RID,
  301          * and we know what the resources for this device are (ie. they aren't
  302          * maintained by a child bus), then work out the start/end values.
  303          */
  304         if (!passthrough && isdefault) {
  305                 rle = resource_list_find(&ndev->nx_resources, type, *rid);
  306                 if (rle == NULL)
  307                         return (NULL);
  308                 if (rle->res != NULL) {
  309                         panic("%s: resource entry is busy", __func__);
  310                 }
  311                 start = rle->start;
  312                 end = rle->end;
  313                 count = rle->count;
  314         }
  315 
  316         switch (type) {
  317         case SYS_RES_IRQ:
  318                 rm = &irq_rman;
  319                 break;
  320         case SYS_RES_MEMORY:
  321                 rm = &mem_rman;
  322                 break;
  323         default:
  324                 printf("%s: unknown resource type %d\n", __func__, type);
  325                 return (0);
  326         }
  327 
  328         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  329         if (rv == NULL) {
  330                 printf("%s: could not reserve resource for %s\n", __func__,
  331                     device_get_nameunit(child));
  332                 return (0);
  333         }
  334 
  335         rman_set_rid(rv, *rid);
  336 
  337         if (needactivate) {
  338                 if (bus_activate_resource(child, type, *rid, rv)) {
  339                         printf("%s: could not activate resource\n", __func__);
  340                         rman_release_resource(rv);
  341                         return (0);
  342                 }
  343         }
  344 
  345         return (rv);
  346 }
  347 
  348 static struct resource_list *
  349 nexus_get_reslist(device_t dev, device_t child)
  350 {
  351         struct nexus_device *ndev = DEVTONX(child);
  352 
  353         return (&ndev->nx_resources);
  354 }
  355 
  356 static int
  357 nexus_set_resource(device_t dev, device_t child, int type, int rid,
  358     rman_res_t start, rman_res_t count)
  359 {
  360         struct nexus_device             *ndev = DEVTONX(child);
  361         struct resource_list            *rl = &ndev->nx_resources;
  362         struct resource_list_entry      *rle;
  363 
  364         dprintf("%s: entry (%p, %p, %d, %d, %p, %jd)\n",
  365             __func__, dev, child, type, rid, (void *)(intptr_t)start, count);
  366 
  367         rle = resource_list_add(rl, type, rid, start, start + count - 1,
  368             count);
  369         if (rle == NULL)
  370                 return (ENXIO);
  371 
  372         return (0);
  373 }
  374 
  375 static int
  376 nexus_get_resource(device_t dev, device_t child, int type, int rid,
  377     rman_res_t *startp, rman_res_t *countp)
  378 {
  379         struct nexus_device             *ndev = DEVTONX(child);
  380         struct resource_list            *rl = &ndev->nx_resources;
  381         struct resource_list_entry      *rle;
  382 
  383         rle = resource_list_find(rl, type, rid);
  384         if (!rle)
  385                 return(ENOENT);
  386         if (startp)
  387                 *startp = rle->start;
  388         if (countp)
  389                 *countp = rle->count;
  390         return (0);
  391 }
  392 
  393 static void
  394 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
  395 {
  396         struct nexus_device     *ndev = DEVTONX(child);
  397         struct resource_list    *rl = &ndev->nx_resources;
  398 
  399         dprintf("%s: entry\n", __func__);
  400 
  401         resource_list_delete(rl, type, rid);
  402 }
  403 
  404 static int
  405 nexus_release_resource(device_t bus, device_t child, int type, int rid,
  406                        struct resource *r)
  407 {
  408         dprintf("%s: entry\n", __func__);
  409 
  410         if (rman_get_flags(r) & RF_ACTIVE) {
  411                 int error = bus_deactivate_resource(child, type, rid, r);
  412                 if (error)
  413                         return error;
  414         }
  415 
  416         return (rman_release_resource(r));
  417 }
  418 
  419 static int
  420 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
  421     struct resource *r)
  422 {
  423         void *vaddr;
  424         vm_paddr_t paddr;
  425         vm_size_t psize;
  426         int err;
  427 
  428         /*
  429          * If this is a memory resource, use pmap_mapdev to map it.
  430          */
  431         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  432                 paddr = rman_get_start(r);
  433                 psize = rman_get_size(r);
  434                 rman_set_bustag(r, mips_bus_space_generic);
  435                 err = bus_space_map(rman_get_bustag(r), paddr, psize, 0,
  436                     (bus_space_handle_t *)&vaddr);
  437                 if (err != 0) {
  438                         rman_deactivate_resource(r);
  439                         return (err);
  440                 }
  441                 rman_set_virtual(r, vaddr);
  442                 rman_set_bushandle(r, (bus_space_handle_t)(uintptr_t)vaddr);
  443         } else if (type == SYS_RES_IRQ) {
  444 #ifdef INTRNG
  445                 err = mips_pic_activate_intr(child, r);
  446                 if (err != 0) {
  447                         rman_deactivate_resource(r);
  448                         return (err);
  449                 }
  450 #endif
  451         }
  452 
  453         return (rman_activate_resource(r));
  454 }
  455 
  456 static int
  457 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  458                           struct resource *r)
  459 {
  460         bus_space_handle_t vaddr;
  461         bus_size_t psize;
  462 
  463         vaddr = rman_get_bushandle(r);
  464 
  465         if (type == SYS_RES_MEMORY && vaddr != 0) {
  466                 psize = (bus_size_t)rman_get_size(r);
  467                 bus_space_unmap(rman_get_bustag(r), vaddr, psize);
  468                 rman_set_virtual(r, NULL);
  469                 rman_set_bushandle(r, 0);
  470         } else if (type == SYS_RES_IRQ) {
  471 #ifdef INTRNG
  472                 mips_pic_deactivate_intr(child, r);
  473 #endif
  474         }
  475 
  476         return (rman_deactivate_resource(r));
  477 }
  478 
  479 static int
  480 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
  481     driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
  482 {
  483 #ifdef INTRNG
  484         return (intr_setup_irq(child, res, filt, intr, arg, flags, cookiep));
  485 #else
  486         int irq;
  487         register_t s;
  488 
  489         s = intr_disable();
  490         irq = rman_get_start(res);
  491         if (irq >= NUM_MIPS_IRQS) {
  492                 intr_restore(s);
  493                 return (0);
  494         }
  495 
  496         cpu_establish_hardintr(device_get_nameunit(child), filt, intr, arg,
  497             irq, flags, cookiep);
  498         intr_restore(s);
  499 
  500         return (0);
  501 #endif
  502 }
  503 
  504 static int
  505 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  506 {
  507 
  508 #ifdef INTRNG
  509         return (intr_teardown_irq(child, r, ih));
  510 #else
  511         printf("Unimplemented %s at %s:%d\n", __func__, __FILE__, __LINE__);
  512         return (0);
  513 #endif
  514 }
  515 
  516 #ifdef INTRNG
  517 static int
  518 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
  519     enum intr_polarity pol)
  520 {
  521 
  522         device_printf(dev, "bus_config_intr is obsolete and not supported!\n");
  523         return (EOPNOTSUPP);
  524 }
  525 
  526 static int
  527 nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
  528     void *cookie, const char *descr)
  529 {
  530 
  531         return (intr_describe_irq(child, irq, cookie, descr));
  532 }
  533 
  534 #ifdef SMP
  535 static int
  536 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
  537 {
  538 
  539         return (intr_bind_irq(child, irq, cpu));
  540 }
  541 #endif
  542 
  543 #ifdef FDT
  544 static int
  545 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
  546     pcell_t *intr)
  547 {
  548         u_int irq;
  549         struct intr_map_data_fdt *fdt_data;
  550         size_t len;
  551 
  552         len = sizeof(*fdt_data) + icells * sizeof(pcell_t);
  553         fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data(
  554             INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO);
  555         fdt_data->iparent = iparent;
  556         fdt_data->ncells = icells;
  557         memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t));
  558         irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data);
  559         return (irq);
  560 }
  561 #endif
  562 #endif /* INTRNG */
  563 
  564 static void
  565 nexus_hinted_child(device_t bus, const char *dname, int dunit)
  566 {
  567         device_t child;
  568         long    maddr;
  569         int     msize;
  570         int     order;
  571         int     result;
  572         int     irq;
  573         int     mem_hints_count;
  574 
  575         if ((resource_int_value(dname, dunit, "order", &order)) != 0)
  576                 order = 1000;
  577         child = BUS_ADD_CHILD(bus, order, dname, dunit);
  578         if (child == NULL)
  579                 return;
  580 
  581         /*
  582          * Set hard-wired resources for hinted child using
  583          * specific RIDs.
  584          */
  585         mem_hints_count = 0;
  586         if (resource_long_value(dname, dunit, "maddr", &maddr) == 0)
  587                 mem_hints_count++;
  588         if (resource_int_value(dname, dunit, "msize", &msize) == 0)
  589                 mem_hints_count++;
  590 
  591         /* check if all info for mem resource has been provided */
  592         if ((mem_hints_count > 0) && (mem_hints_count < 2)) {
  593                 printf("Either maddr or msize hint is missing for %s%d\n",
  594                     dname, dunit);
  595         } 
  596         else if (mem_hints_count) {
  597                 dprintf("%s: discovered hinted child %s at maddr %p(%d)\n",
  598                     __func__, device_get_nameunit(child),
  599                     (void *)(intptr_t)maddr, msize);
  600 
  601                 result = bus_set_resource(child, SYS_RES_MEMORY, 0,
  602                     (u_long) maddr, msize);
  603                 if (result != 0) {
  604                         device_printf(bus, 
  605                             "warning: bus_set_resource() failed\n");
  606                 }
  607         }
  608 
  609         if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
  610                 result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
  611                 if (result != 0)
  612                         device_printf(bus,
  613                             "warning: bus_set_resource() failed\n");
  614         }
  615 }
  616 
  617 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
  618     BUS_PASS_BUS + BUS_PASS_ORDER_EARLY);

Cache object: 2cfa6d35915af1a44e20f6fe433d1183


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