The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/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 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: src/sys/i386/i386/nexus.c,v 1.58.2.2 2004/11/07 22:35:36 njl Exp $");
   32 
   33 /*
   34  * This code implements a `root nexus' for Intel Architecture
   35  * machines.  The function of the root nexus is to serve as an
   36  * attachment point for both processors and buses, and to manage
   37  * resources which are common to all of them.  In particular,
   38  * this code implements the core resource managers for interrupt
   39  * requests, DMA requests (which rightfully should be a part of the
   40  * ISA code but it's easier to do it here for now), I/O port addresses,
   41  * and I/O memory address space.
   42  */
   43 
   44 #include "opt_isa.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/bus.h>
   49 #include <sys/kernel.h>
   50 #include <sys/malloc.h>
   51 #include <sys/module.h>
   52 #include <machine/bus.h>
   53 #include <machine/intr_machdep.h>
   54 #include <sys/rman.h>
   55 #include <sys/interrupt.h>
   56 
   57 #include <machine/vmparam.h>
   58 #include <vm/vm.h>
   59 #include <vm/pmap.h>
   60 #include <machine/pmap.h>
   61 
   62 #include <machine/resource.h>
   63 
   64 #ifdef DEV_ISA
   65 #include <isa/isavar.h>
   66 #ifdef PC98
   67 #include <pc98/pc98/pc98.h>
   68 #else
   69 #include <i386/isa/isa.h>
   70 #endif
   71 #endif
   72 #include <sys/rtprio.h>
   73 
   74 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
   75 struct nexus_device {
   76         struct resource_list    nx_resources;
   77 };
   78 
   79 #define DEVTONX(dev)    ((struct nexus_device *)device_get_ivars(dev))
   80 
   81 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
   82 
   83 static  int nexus_probe(device_t);
   84 static  int nexus_attach(device_t);
   85 static  int nexus_print_all_resources(device_t dev);
   86 static  int nexus_print_child(device_t, device_t);
   87 static device_t nexus_add_child(device_t bus, int order, const char *name,
   88                                 int unit);
   89 static  struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
   90                                               u_long, u_long, u_long, u_int);
   91 static  int nexus_config_intr(device_t, int, enum intr_trigger,
   92                               enum intr_polarity);
   93 static  int nexus_activate_resource(device_t, device_t, int, int,
   94                                     struct resource *);
   95 static  int nexus_deactivate_resource(device_t, device_t, int, int,
   96                                       struct resource *);
   97 static  int nexus_release_resource(device_t, device_t, int, int,
   98                                    struct resource *);
   99 static  int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
  100                              void (*)(void *), void *, void **);
  101 static  int nexus_teardown_intr(device_t, device_t, struct resource *,
  102                                 void *);
  103 static struct resource_list *nexus_get_reslist(device_t dev, device_t child);
  104 static  int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
  105 static  int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
  106 static void nexus_delete_resource(device_t, device_t, int, int);
  107 
  108 static device_method_t nexus_methods[] = {
  109         /* Device interface */
  110         DEVMETHOD(device_probe,         nexus_probe),
  111         DEVMETHOD(device_attach,        nexus_attach),
  112         DEVMETHOD(device_detach,        bus_generic_detach),
  113         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  114         DEVMETHOD(device_suspend,       bus_generic_suspend),
  115         DEVMETHOD(device_resume,        bus_generic_resume),
  116 
  117         /* Bus interface */
  118         DEVMETHOD(bus_print_child,      nexus_print_child),
  119         DEVMETHOD(bus_add_child,        nexus_add_child),
  120         DEVMETHOD(bus_alloc_resource,   nexus_alloc_resource),
  121         DEVMETHOD(bus_release_resource, nexus_release_resource),
  122         DEVMETHOD(bus_activate_resource, nexus_activate_resource),
  123         DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
  124         DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
  125         DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
  126         DEVMETHOD(bus_config_intr,      nexus_config_intr),
  127         DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
  128         DEVMETHOD(bus_set_resource,     nexus_set_resource),
  129         DEVMETHOD(bus_get_resource,     nexus_get_resource),
  130         DEVMETHOD(bus_delete_resource,  nexus_delete_resource),
  131 
  132         { 0, 0 }
  133 };
  134 
  135 static driver_t nexus_driver = {
  136         "nexus",
  137         nexus_methods,
  138         1,                      /* no softc */
  139 };
  140 static devclass_t nexus_devclass;
  141 
  142 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
  143 
  144 static int
  145 nexus_probe(device_t dev)
  146 {
  147         int irq, last;
  148 
  149         device_quiet(dev);      /* suppress attach message for neatness */
  150 
  151         /* 
  152          * XXX working notes:
  153          *
  154          * - IRQ resource creation should be moved to the PIC/APIC driver.
  155          * - DRQ resource creation should be moved to the DMAC driver.
  156          * - The above should be sorted to probe earlier than any child busses.
  157          *
  158          * - Leave I/O and memory creation here, as child probes may need them.
  159          *   (especially eg. ACPI)
  160          */
  161 
  162         /*
  163          * IRQ's are on the mainboard on old systems, but on the ISA part
  164          * of PCI->ISA bridges.  There would be multiple sets of IRQs on
  165          * multi-ISA-bus systems.  PCI interrupts are routed to the ISA
  166          * component, so in a way, PCI can be a partial child of an ISA bus(!).
  167          * APIC interrupts are global though.
  168          */
  169         irq_rman.rm_start = 0;
  170         irq_rman.rm_type = RMAN_ARRAY;
  171         irq_rman.rm_descr = "Interrupt request lines";
  172         irq_rman.rm_end = NUM_IO_INTS - 1;
  173         if (rman_init(&irq_rman))
  174                 panic("nexus_probe irq_rman");
  175 
  176         /*
  177          * We search for regions of existing IRQs and add those to the IRQ
  178          * resource manager.
  179          */
  180         last = -1;
  181         for (irq = 0; irq < NUM_IO_INTS; irq++)
  182                 if (intr_lookup_source(irq) != NULL) {
  183                         if (last == -1)
  184                                 last = irq;
  185                 } else if (last != -1) {
  186                         if (rman_manage_region(&irq_rman, last, irq - 1) != 0)
  187                                 panic("nexus_probe irq_rman add");
  188                         last = -1;
  189                 }
  190         if (last != -1 && rman_manage_region(&irq_rman, last, irq - 1) != 0)
  191                 panic("nexus_probe irq_rman add");
  192 
  193         /*
  194          * ISA DMA on PCI systems is implemented in the ISA part of each
  195          * PCI->ISA bridge and the channels can be duplicated if there are
  196          * multiple bridges.  (eg: laptops with docking stations)
  197          */
  198         drq_rman.rm_start = 0;
  199 #ifdef PC98
  200         drq_rman.rm_end = 3;
  201 #else
  202         drq_rman.rm_end = 7;
  203 #endif
  204         drq_rman.rm_type = RMAN_ARRAY;
  205         drq_rman.rm_descr = "DMA request lines";
  206         /* XXX drq 0 not available on some machines */
  207         if (rman_init(&drq_rman)
  208             || rman_manage_region(&drq_rman,
  209                                   drq_rman.rm_start, drq_rman.rm_end))
  210                 panic("nexus_probe drq_rman");
  211 
  212         /*
  213          * However, IO ports and Memory truely are global at this level,
  214          * as are APIC interrupts (however many IO APICS there turn out
  215          * to be on large systems..)
  216          */
  217         port_rman.rm_start = 0;
  218         port_rman.rm_end = 0xffff;
  219         port_rman.rm_type = RMAN_ARRAY;
  220         port_rman.rm_descr = "I/O ports";
  221         if (rman_init(&port_rman)
  222             || rman_manage_region(&port_rman, 0, 0xffff))
  223                 panic("nexus_probe port_rman");
  224 
  225         mem_rman.rm_start = 0;
  226         mem_rman.rm_end = ~0u;
  227         mem_rman.rm_type = RMAN_ARRAY;
  228         mem_rman.rm_descr = "I/O memory addresses";
  229         if (rman_init(&mem_rman)
  230             || rman_manage_region(&mem_rman, 0, ~0))
  231                 panic("nexus_probe mem_rman");
  232 
  233         return 0;
  234 }
  235 
  236 static int
  237 nexus_attach(device_t dev)
  238 {
  239 
  240         bus_generic_probe(dev);
  241         bus_generic_attach(dev);
  242         return 0;
  243 }
  244 
  245 static int
  246 nexus_print_all_resources(device_t dev)
  247 {
  248         struct  nexus_device *ndev = DEVTONX(dev);
  249         struct resource_list *rl = &ndev->nx_resources;
  250         int retval = 0;
  251 
  252         if (SLIST_FIRST(rl))
  253                 retval += printf(" at");
  254         
  255         retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
  256         retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
  257         retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
  258 
  259         return retval;
  260 }
  261 
  262 static int
  263 nexus_print_child(device_t bus, device_t child)
  264 {
  265         int retval = 0;
  266 
  267         retval += bus_print_child_header(bus, child);
  268         retval += nexus_print_all_resources(child);
  269         if (device_get_flags(child))
  270                 retval += printf(" flags %#x", device_get_flags(child));
  271         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  272 
  273         return (retval);
  274 }
  275 
  276 static device_t
  277 nexus_add_child(device_t bus, int order, const char *name, int unit)
  278 {
  279         device_t                child;
  280         struct nexus_device     *ndev;
  281 
  282         ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
  283         if (!ndev)
  284                 return(0);
  285         resource_list_init(&ndev->nx_resources);
  286 
  287         child = device_add_child_ordered(bus, order, name, unit); 
  288 
  289         /* should we free this in nexus_child_detached? */
  290         device_set_ivars(child, ndev);
  291 
  292         return(child);
  293 }
  294 
  295 /*
  296  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  297  * child of one of our descendants, not a direct child of nexus0.
  298  * (Exceptions include npx.)
  299  */
  300 static struct resource *
  301 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  302                      u_long start, u_long end, u_long count, u_int flags)
  303 {
  304         struct nexus_device *ndev = DEVTONX(child);
  305         struct  resource *rv;
  306         struct resource_list_entry *rle;
  307         struct  rman *rm;
  308         int needactivate = flags & RF_ACTIVE;
  309 #ifdef PC98
  310         bus_space_handle_t bh;
  311 #endif
  312 
  313         /*
  314          * If this is an allocation of the "default" range for a given RID, and
  315          * we know what the resources for this device are (ie. they aren't maintained
  316          * by a child bus), then work out the start/end values.
  317          */
  318         if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
  319                 if (ndev == NULL)
  320                         return(NULL);
  321                 rle = resource_list_find(&ndev->nx_resources, type, *rid);
  322                 if (rle == NULL)
  323                         return(NULL);
  324                 start = rle->start;
  325                 end = rle->end;
  326                 count = rle->count;
  327         }
  328 
  329         flags &= ~RF_ACTIVE;
  330 
  331         switch (type) {
  332         case SYS_RES_IRQ:
  333                 rm = &irq_rman;
  334                 break;
  335 
  336         case SYS_RES_DRQ:
  337                 rm = &drq_rman;
  338                 break;
  339 
  340         case SYS_RES_IOPORT:
  341                 rm = &port_rman;
  342                 break;
  343 
  344         case SYS_RES_MEMORY:
  345                 rm = &mem_rman;
  346                 break;
  347 
  348         default:
  349                 return 0;
  350         }
  351 
  352         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  353         if (rv == 0)
  354                 return 0;
  355 
  356         if (type == SYS_RES_MEMORY) {
  357                 rman_set_bustag(rv, I386_BUS_SPACE_MEM);
  358         } else if (type == SYS_RES_IOPORT) {
  359                 rman_set_bustag(rv, I386_BUS_SPACE_IO);
  360 #ifndef PC98
  361                 rman_set_bushandle(rv, rman_get_start(rv));
  362 #endif
  363         }
  364 
  365 #ifdef PC98
  366         if ((type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) &&
  367             i386_bus_space_handle_alloc(rman_get_bustag(rv),
  368               rman_get_start(rv), count, &bh) != 0) {
  369                 rman_release_resource(rv);
  370                 return 0;
  371         }
  372         rman_set_bushandle(rv, bh);
  373 #endif
  374 
  375         if (needactivate) {
  376                 if (bus_activate_resource(child, type, *rid, rv)) {
  377 #ifdef PC98
  378                         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  379                                 bh = rman_get_bushandle(rv);
  380                                 i386_bus_space_handle_free(rman_get_bustag(rv),
  381                                     bh, bh->bsh_sz);
  382                         }
  383 #endif
  384                         rman_release_resource(rv);
  385                         return 0;
  386                 }
  387         }
  388         
  389         return rv;
  390 }
  391 
  392 static int
  393 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
  394                         struct resource *r)
  395 {
  396 #ifdef PC98
  397         bus_space_handle_t bh;
  398 #endif
  399         /*
  400          * If this is a memory resource, map it into the kernel.
  401          */
  402         if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) {
  403                 caddr_t vaddr = 0;
  404 
  405                 if (rman_get_end(r) < 1024 * 1024) {
  406                         /*
  407                          * The first 1Mb is mapped at KERNBASE.
  408                          */
  409                         vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
  410                 } else {
  411                         u_int32_t paddr;
  412                         u_int32_t psize;
  413                         u_int32_t poffs;
  414 
  415                         paddr = rman_get_start(r);
  416                         psize = rman_get_size(r);
  417 
  418                         poffs = paddr - trunc_page(paddr);
  419                         vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
  420                 }
  421                 rman_set_virtual(r, vaddr);
  422 #ifdef PC98
  423                 /* PC-98: the type of bus_space_handle_t is the structure. */
  424                 bh = rman_get_bushandle(r);
  425                 bh->bsh_base = (bus_addr_t) vaddr;
  426 #else
  427                 /* IBM-PC: the type of bus_space_handle_t is u_int */
  428                 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
  429 #endif
  430         }
  431         return (rman_activate_resource(r));
  432 }
  433 
  434 static int
  435 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  436                           struct resource *r)
  437 {
  438         /*
  439          * If this is a memory resource, unmap it.
  440          */
  441         if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) &&
  442             (rman_get_end(r) >= 1024 * 1024)) {
  443                 u_int32_t psize;
  444 
  445                 psize = rman_get_size(r);
  446                 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
  447         }
  448                 
  449         return (rman_deactivate_resource(r));
  450 }
  451 
  452 static int
  453 nexus_release_resource(device_t bus, device_t child, int type, int rid,
  454                        struct resource *r)
  455 {
  456         if (rman_get_flags(r) & RF_ACTIVE) {
  457                 int error = bus_deactivate_resource(child, type, rid, r);
  458                 if (error)
  459                         return error;
  460         }
  461 #ifdef PC98
  462         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  463                 bus_space_handle_t bh;
  464 
  465                 bh = rman_get_bushandle(r);
  466                 i386_bus_space_handle_free(rman_get_bustag(r), bh, bh->bsh_sz);
  467         }
  468 #endif
  469         return (rman_release_resource(r));
  470 }
  471 
  472 /*
  473  * Currently this uses the really grody interface from kern/kern_intr.c
  474  * (which really doesn't belong in kern/anything.c).  Eventually, all of
  475  * the code in kern_intr.c and machdep_intr.c should get moved here, since
  476  * this is going to be the official interface.
  477  */
  478 static int
  479 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
  480                  int flags, void (*ihand)(void *), void *arg, void **cookiep)
  481 {
  482         int             error;
  483 
  484         /* somebody tried to setup an irq that failed to allocate! */
  485         if (irq == NULL)
  486                 panic("nexus_setup_intr: NULL irq resource!");
  487 
  488         *cookiep = 0;
  489         if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
  490                 flags |= INTR_EXCL;
  491 
  492         /*
  493          * We depend here on rman_activate_resource() being idempotent.
  494          */
  495         error = rman_activate_resource(irq);
  496         if (error)
  497                 return (error);
  498 
  499         error = intr_add_handler(device_get_nameunit(child),
  500             rman_get_start(irq), ihand, arg, flags, cookiep);
  501 
  502         return (error);
  503 }
  504 
  505 static int
  506 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  507 {
  508         return (intr_remove_handler(ih));
  509 }
  510 
  511 static int
  512 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
  513     enum intr_polarity pol)
  514 {
  515         return (intr_config_intr(irq, trig, pol));
  516 }
  517 
  518 static struct resource_list *
  519 nexus_get_reslist(device_t dev, device_t child)
  520 {
  521         struct nexus_device *ndev = DEVTONX(child);
  522 
  523         return (&ndev->nx_resources);
  524 }
  525 
  526 static int
  527 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
  528 {
  529         struct nexus_device     *ndev = DEVTONX(child);
  530         struct resource_list    *rl = &ndev->nx_resources;
  531 
  532         /* XXX this should return a success/failure indicator */
  533         resource_list_add(rl, type, rid, start, start + count - 1, count);
  534         return(0);
  535 }
  536 
  537 static int
  538 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
  539 {
  540         struct nexus_device     *ndev = DEVTONX(child);
  541         struct resource_list    *rl = &ndev->nx_resources;
  542         struct resource_list_entry *rle;
  543 
  544         rle = resource_list_find(rl, type, rid);
  545         if (!rle)
  546                 return(ENOENT);
  547         if (startp)
  548                 *startp = rle->start;
  549         if (countp)
  550                 *countp = rle->count;
  551         return(0);
  552 }
  553 
  554 static void
  555 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
  556 {
  557         struct nexus_device     *ndev = DEVTONX(child);
  558         struct resource_list    *rl = &ndev->nx_resources;
  559 
  560         resource_list_delete(rl, type, rid);
  561 }
  562 
  563 #ifdef DEV_ISA
  564 /*
  565  * Placeholder which claims PnP 'devices' which describe system 
  566  * resources.
  567  */
  568 static struct isa_pnp_id sysresource_ids[] = {
  569         { 0x010cd041 /* PNP0c01 */, "System Memory" },
  570         { 0x020cd041 /* PNP0c02 */, "System Resource" },
  571         { 0 }
  572 };
  573 
  574 static int
  575 sysresource_probe(device_t dev)
  576 {
  577         int     result;
  578         
  579         if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
  580                 device_quiet(dev);
  581         }
  582         return(result);
  583 }
  584 
  585 static int
  586 sysresource_attach(device_t dev)
  587 {
  588         return(0);
  589 }
  590 
  591 static device_method_t sysresource_methods[] = {
  592         /* Device interface */
  593         DEVMETHOD(device_probe,         sysresource_probe),
  594         DEVMETHOD(device_attach,        sysresource_attach),
  595         DEVMETHOD(device_detach,        bus_generic_detach),
  596         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  597         DEVMETHOD(device_suspend,       bus_generic_suspend),
  598         DEVMETHOD(device_resume,        bus_generic_resume),
  599         { 0, 0 }
  600 };
  601 
  602 static driver_t sysresource_driver = {
  603         "sysresource",
  604         sysresource_methods,
  605         1,              /* no softc */
  606 };
  607 
  608 static devclass_t sysresource_devclass;
  609 
  610 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);
  611 #endif /* DEV_ISA */

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