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("$FreeBSD$");
   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   intr_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         { 0, 0 }
  167 };
  168 
  169 static driver_t nexus_driver = {
  170         "nexus",
  171         nexus_methods,
  172         1                       /* no softc */
  173 };
  174 static devclass_t nexus_devclass;
  175 
  176 static int
  177 nexus_probe(device_t dev)
  178 {
  179 
  180         device_set_desc(dev, "MIPS32 root nexus");
  181 
  182         irq_rman.rm_start = 0;
  183         irq_rman.rm_end = NUM_MIPS_IRQS - 1;
  184         irq_rman.rm_type = RMAN_ARRAY;
  185         irq_rman.rm_descr = "Hardware IRQs";
  186         if (rman_init(&irq_rman) != 0 ||
  187             rman_manage_region(&irq_rman, 0, NUM_MIPS_IRQS - 1) != 0) {
  188                 panic("%s: irq_rman", __func__);
  189         }
  190 
  191         mem_rman.rm_start = 0;
  192         mem_rman.rm_end = BUS_SPACE_MAXADDR;
  193         mem_rman.rm_type = RMAN_ARRAY;
  194         mem_rman.rm_descr = "Memory addresses";
  195         if (rman_init(&mem_rman) != 0 ||
  196             rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR) != 0) {
  197                 panic("%s: mem_rman", __func__);
  198         }
  199 
  200         return (0);
  201 }
  202 
  203 static int
  204 nexus_attach(device_t dev)
  205 {
  206 #if defined(INTRNG) && !defined(FDT)
  207         int error;
  208 
  209         if ((error = mips_pic_map_fixed_intrs()))
  210                 return (error);
  211 #endif
  212 
  213         bus_generic_probe(dev);
  214         bus_enumerate_hinted_children(dev);
  215         bus_generic_attach(dev);
  216 
  217         return (0);
  218 }
  219 
  220 static int
  221 nexus_print_child(device_t bus, device_t child)
  222 {
  223         int retval = 0;
  224 
  225         retval += bus_print_child_header(bus, child);
  226         retval += nexus_print_all_resources(child);
  227         if (device_get_flags(child))
  228                 retval += printf(" flags %#x", device_get_flags(child));
  229         retval += printf(" on %s\n", device_get_nameunit(bus));
  230 
  231         return (retval);
  232 }
  233 
  234 static int
  235 nexus_print_all_resources(device_t dev)
  236 {
  237         struct nexus_device *ndev = DEVTONX(dev);
  238         struct resource_list *rl = &ndev->nx_resources;
  239         int retval = 0;
  240 
  241         if (STAILQ_FIRST(rl))
  242                 retval += printf(" at");
  243 
  244         retval += resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#jx");
  245         retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd");
  246 
  247         return (retval);
  248 }
  249 
  250 static device_t
  251 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
  252 {
  253         device_t        child;
  254         struct nexus_device *ndev;
  255 
  256         ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
  257         if (!ndev)
  258                 return (0);
  259         resource_list_init(&ndev->nx_resources);
  260 
  261         child = device_add_child_ordered(bus, order, name, unit);
  262         if (child == NULL) {
  263                 device_printf(bus, "failed to add child: %s%d\n", name, unit);
  264                 return (0);
  265         }
  266 
  267         /* should we free this in nexus_child_detached? */
  268         device_set_ivars(child, ndev);
  269 
  270         return (child);
  271 }
  272 
  273 /*
  274  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  275  * child of one of our descendants, not a direct child of nexus0.
  276  * (Exceptions include footbridge.)
  277  */
  278 static struct resource *
  279 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  280         rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
  281 {
  282         struct nexus_device             *ndev = DEVTONX(child);
  283         struct resource                 *rv;
  284         struct resource_list_entry      *rle;
  285         struct rman                     *rm;
  286         int                              isdefault, needactivate, passthrough;
  287 
  288         dprintf("%s: entry (%p, %p, %d, %p, %p, %p, %jd, %d)\n",
  289             __func__, bus, child, type, rid, (void *)(intptr_t)start,
  290             (void *)(intptr_t)end, count, flags);
  291         dprintf("%s: requested rid is %d\n", __func__, *rid);
  292 
  293         isdefault = (RMAN_IS_DEFAULT_RANGE(start, end) && count == 1);
  294         needactivate = flags & RF_ACTIVE;
  295         passthrough = (device_get_parent(child) != bus);
  296         rle = NULL;
  297 
  298         /*
  299          * If this is an allocation of the "default" range for a given RID,
  300          * and we know what the resources for this device are (ie. they aren't
  301          * maintained by a child bus), then work out the start/end values.
  302          */
  303         if (!passthrough && isdefault) {
  304                 rle = resource_list_find(&ndev->nx_resources, type, *rid);
  305                 if (rle == NULL)
  306                         return (NULL);
  307                 if (rle->res != NULL) {
  308                         panic("%s: resource entry is busy", __func__);
  309                 }
  310                 start = rle->start;
  311                 end = rle->end;
  312                 count = rle->count;
  313         }
  314 
  315         switch (type) {
  316         case SYS_RES_IRQ:
  317                 rm = &irq_rman;
  318                 break;
  319         case SYS_RES_MEMORY:
  320                 rm = &mem_rman;
  321                 break;
  322         default:
  323                 printf("%s: unknown resource type %d\n", __func__, type);
  324                 return (0);
  325         }
  326 
  327         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  328         if (rv == NULL) {
  329                 printf("%s: could not reserve resource for %s\n", __func__,
  330                     device_get_nameunit(child));
  331                 return (0);
  332         }
  333 
  334         rman_set_rid(rv, *rid);
  335 
  336         if (needactivate) {
  337                 if (bus_activate_resource(child, type, *rid, rv)) {
  338                         printf("%s: could not activate resource\n", __func__);
  339                         rman_release_resource(rv);
  340                         return (0);
  341                 }
  342         }
  343 
  344         return (rv);
  345 }
  346 
  347 static struct resource_list *
  348 nexus_get_reslist(device_t dev, device_t child)
  349 {
  350         struct nexus_device *ndev = DEVTONX(child);
  351 
  352         return (&ndev->nx_resources);
  353 }
  354 
  355 static int
  356 nexus_set_resource(device_t dev, device_t child, int type, int rid,
  357     rman_res_t start, rman_res_t count)
  358 {
  359         struct nexus_device             *ndev = DEVTONX(child);
  360         struct resource_list            *rl = &ndev->nx_resources;
  361         struct resource_list_entry      *rle;
  362 
  363         dprintf("%s: entry (%p, %p, %d, %d, %p, %jd)\n",
  364             __func__, dev, child, type, rid, (void *)(intptr_t)start, count);
  365 
  366         rle = resource_list_add(rl, type, rid, start, start + count - 1,
  367             count);
  368         if (rle == NULL)
  369                 return (ENXIO);
  370 
  371         return (0);
  372 }
  373 
  374 static int
  375 nexus_get_resource(device_t dev, device_t child, int type, int rid,
  376     rman_res_t *startp, rman_res_t *countp)
  377 {
  378         struct nexus_device             *ndev = DEVTONX(child);
  379         struct resource_list            *rl = &ndev->nx_resources;
  380         struct resource_list_entry      *rle;
  381 
  382         rle = resource_list_find(rl, type, rid);
  383         if (!rle)
  384                 return(ENOENT);
  385         if (startp)
  386                 *startp = rle->start;
  387         if (countp)
  388                 *countp = rle->count;
  389         return (0);
  390 }
  391 
  392 static void
  393 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
  394 {
  395         struct nexus_device     *ndev = DEVTONX(child);
  396         struct resource_list    *rl = &ndev->nx_resources;
  397 
  398         dprintf("%s: entry\n", __func__);
  399 
  400         resource_list_delete(rl, type, rid);
  401 }
  402 
  403 static int
  404 nexus_release_resource(device_t bus, device_t child, int type, int rid,
  405                        struct resource *r)
  406 {
  407         dprintf("%s: entry\n", __func__);
  408 
  409         if (rman_get_flags(r) & RF_ACTIVE) {
  410                 int error = bus_deactivate_resource(child, type, rid, r);
  411                 if (error)
  412                         return error;
  413         }
  414 
  415         return (rman_release_resource(r));
  416 }
  417 
  418 static int
  419 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
  420     struct resource *r)
  421 {
  422         void *vaddr;
  423         vm_paddr_t paddr;
  424         vm_size_t psize;
  425         int err;
  426 
  427         /*
  428          * If this is a memory resource, use pmap_mapdev to map it.
  429          */
  430         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  431                 paddr = rman_get_start(r);
  432                 psize = rman_get_size(r);
  433                 rman_set_bustag(r, mips_bus_space_generic);
  434                 err = bus_space_map(rman_get_bustag(r), paddr, psize, 0,
  435                     (bus_space_handle_t *)&vaddr);
  436                 if (err != 0) {
  437                         rman_deactivate_resource(r);
  438                         return (err);
  439                 }
  440                 rman_set_virtual(r, vaddr);
  441                 rman_set_bushandle(r, (bus_space_handle_t)(uintptr_t)vaddr);
  442         } else if (type == SYS_RES_IRQ) {
  443 #ifdef INTRNG
  444                 err = mips_pic_activate_intr(child, r);
  445                 if (err != 0) {
  446                         rman_deactivate_resource(r);
  447                         return (err);
  448                 }
  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                 mips_pic_deactivate_intr(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         return (intr_setup_irq(child, res, filt, intr, arg, flags, cookiep));
  484 #else
  485         int irq;
  486         register_t s;
  487 
  488         s = intr_disable();
  489         irq = rman_get_start(res);
  490         if (irq >= NUM_MIPS_IRQS) {
  491                 intr_restore(s);
  492                 return (0);
  493         }
  494 
  495         cpu_establish_hardintr(device_get_nameunit(child), filt, intr, arg,
  496             irq, flags, cookiep);
  497         intr_restore(s);
  498 
  499         return (0);
  500 #endif
  501 }
  502 
  503 static int
  504 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  505 {
  506 
  507 #ifdef INTRNG
  508         return (intr_teardown_irq(child, r, ih));
  509 #else
  510         printf("Unimplemented %s at %s:%d\n", __func__, __FILE__, __LINE__);
  511         return (0);
  512 #endif
  513 }
  514 
  515 #ifdef INTRNG
  516 static int
  517 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
  518     enum intr_polarity pol)
  519 {
  520 
  521         device_printf(dev, "bus_config_intr is obsolete and not supported!\n");
  522         return (EOPNOTSUPP);
  523 }
  524 
  525 static int
  526 nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
  527     void *cookie, const char *descr)
  528 {
  529 
  530         return (intr_describe_irq(child, irq, cookie, descr));
  531 }
  532 
  533 #ifdef SMP
  534 static int
  535 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
  536 {
  537 
  538         return (intr_bind_irq(child, irq, cpu));
  539 }
  540 #endif
  541 
  542 #ifdef FDT
  543 static int
  544 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
  545     pcell_t *intr)
  546 {
  547         u_int irq;
  548         struct intr_map_data_fdt *fdt_data;
  549         size_t len;
  550 
  551         len = sizeof(*fdt_data) + icells * sizeof(pcell_t);
  552         fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data(
  553             INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO);
  554         fdt_data->iparent = iparent;
  555         fdt_data->ncells = icells;
  556         memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t));
  557         irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data);
  558         return (irq);
  559 }
  560 #endif
  561 #endif /* INTRNG */
  562 
  563 static void
  564 nexus_hinted_child(device_t bus, const char *dname, int dunit)
  565 {
  566         device_t child;
  567         long    maddr;
  568         int     msize;
  569         int     order;
  570         int     result;
  571         int     irq;
  572         int     mem_hints_count;
  573 
  574         if ((resource_int_value(dname, dunit, "order", &order)) != 0)
  575                 order = 1000;
  576         child = BUS_ADD_CHILD(bus, order, dname, dunit);
  577         if (child == NULL)
  578                 return;
  579 
  580         /*
  581          * Set hard-wired resources for hinted child using
  582          * specific RIDs.
  583          */
  584         mem_hints_count = 0;
  585         if (resource_long_value(dname, dunit, "maddr", &maddr) == 0)
  586                 mem_hints_count++;
  587         if (resource_int_value(dname, dunit, "msize", &msize) == 0)
  588                 mem_hints_count++;
  589 
  590         /* check if all info for mem resource has been provided */
  591         if ((mem_hints_count > 0) && (mem_hints_count < 2)) {
  592                 printf("Either maddr or msize hint is missing for %s%d\n",
  593                     dname, dunit);
  594         } 
  595         else if (mem_hints_count) {
  596                 dprintf("%s: discovered hinted child %s at maddr %p(%d)\n",
  597                     __func__, device_get_nameunit(child),
  598                     (void *)(intptr_t)maddr, msize);
  599 
  600                 result = bus_set_resource(child, SYS_RES_MEMORY, 0,
  601                     (u_long) maddr, msize);
  602                 if (result != 0) {
  603                         device_printf(bus, 
  604                             "warning: bus_set_resource() failed\n");
  605                 }
  606         }
  607 
  608         if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
  609                 result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
  610                 if (result != 0)
  611                         device_printf(bus,
  612                             "warning: bus_set_resource() failed\n");
  613         }
  614 }
  615 
  616 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
  617     BUS_PASS_BUS + BUS_PASS_ORDER_EARLY);

Cache object: aee8352bdb5ae1ed31a278345be9e76c


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