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: releng/6.2/sys/i386/i386/nexus.c 162558 2006-09-22 19:04:51Z jhb $");
   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/cbus/cbus.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;
  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         for (irq = 0; irq < NUM_IO_INTS; irq++)
  181                 if (intr_lookup_source(irq) != NULL)
  182                         if (rman_manage_region(&irq_rman, irq, irq) != 0)
  183                                 panic("nexus_probe irq_rman add");
  184 
  185         /*
  186          * ISA DMA on PCI systems is implemented in the ISA part of each
  187          * PCI->ISA bridge and the channels can be duplicated if there are
  188          * multiple bridges.  (eg: laptops with docking stations)
  189          */
  190         drq_rman.rm_start = 0;
  191 #ifdef PC98
  192         drq_rman.rm_end = 3;
  193 #else
  194         drq_rman.rm_end = 7;
  195 #endif
  196         drq_rman.rm_type = RMAN_ARRAY;
  197         drq_rman.rm_descr = "DMA request lines";
  198         /* XXX drq 0 not available on some machines */
  199         if (rman_init(&drq_rman)
  200             || rman_manage_region(&drq_rman,
  201                                   drq_rman.rm_start, drq_rman.rm_end))
  202                 panic("nexus_probe drq_rman");
  203 
  204         /*
  205          * However, IO ports and Memory truely are global at this level,
  206          * as are APIC interrupts (however many IO APICS there turn out
  207          * to be on large systems..)
  208          */
  209         port_rman.rm_start = 0;
  210         port_rman.rm_end = 0xffff;
  211         port_rman.rm_type = RMAN_ARRAY;
  212         port_rman.rm_descr = "I/O ports";
  213         if (rman_init(&port_rman)
  214             || rman_manage_region(&port_rman, 0, 0xffff))
  215                 panic("nexus_probe port_rman");
  216 
  217         mem_rman.rm_start = 0;
  218         mem_rman.rm_end = ~0u;
  219         mem_rman.rm_type = RMAN_ARRAY;
  220         mem_rman.rm_descr = "I/O memory addresses";
  221         if (rman_init(&mem_rman)
  222             || rman_manage_region(&mem_rman, 0, ~0))
  223                 panic("nexus_probe mem_rman");
  224 
  225         return 0;
  226 }
  227 
  228 static int
  229 nexus_attach(device_t dev)
  230 {
  231 
  232         bus_generic_probe(dev);
  233         bus_generic_attach(dev);
  234         return 0;
  235 }
  236 
  237 static int
  238 nexus_print_all_resources(device_t dev)
  239 {
  240         struct  nexus_device *ndev = DEVTONX(dev);
  241         struct resource_list *rl = &ndev->nx_resources;
  242         int retval = 0;
  243 
  244         if (STAILQ_FIRST(rl))
  245                 retval += printf(" at");
  246         
  247         retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
  248         retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
  249         retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
  250 
  251         return retval;
  252 }
  253 
  254 static int
  255 nexus_print_child(device_t bus, device_t child)
  256 {
  257         int retval = 0;
  258 
  259         retval += bus_print_child_header(bus, child);
  260         retval += nexus_print_all_resources(child);
  261         if (device_get_flags(child))
  262                 retval += printf(" flags %#x", device_get_flags(child));
  263         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  264 
  265         return (retval);
  266 }
  267 
  268 static device_t
  269 nexus_add_child(device_t bus, int order, const char *name, int unit)
  270 {
  271         device_t                child;
  272         struct nexus_device     *ndev;
  273 
  274         ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
  275         if (!ndev)
  276                 return(0);
  277         resource_list_init(&ndev->nx_resources);
  278 
  279         child = device_add_child_ordered(bus, order, name, unit); 
  280 
  281         /* should we free this in nexus_child_detached? */
  282         device_set_ivars(child, ndev);
  283 
  284         return(child);
  285 }
  286 
  287 /*
  288  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  289  * child of one of our descendants, not a direct child of nexus0.
  290  * (Exceptions include npx.)
  291  */
  292 static struct resource *
  293 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  294                      u_long start, u_long end, u_long count, u_int flags)
  295 {
  296         struct nexus_device *ndev = DEVTONX(child);
  297         struct  resource *rv;
  298         struct resource_list_entry *rle;
  299         struct  rman *rm;
  300         int needactivate = flags & RF_ACTIVE;
  301 #ifdef PC98
  302         bus_space_handle_t bh;
  303 #endif
  304 
  305         /*
  306          * If this is an allocation of the "default" range for a given RID, and
  307          * we know what the resources for this device are (ie. they aren't maintained
  308          * by a child bus), then work out the start/end values.
  309          */
  310         if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
  311                 if (ndev == NULL)
  312                         return(NULL);
  313                 rle = resource_list_find(&ndev->nx_resources, type, *rid);
  314                 if (rle == NULL)
  315                         return(NULL);
  316                 start = rle->start;
  317                 end = rle->end;
  318                 count = rle->count;
  319         }
  320 
  321         flags &= ~RF_ACTIVE;
  322 
  323         switch (type) {
  324         case SYS_RES_IRQ:
  325                 rm = &irq_rman;
  326                 break;
  327 
  328         case SYS_RES_DRQ:
  329                 rm = &drq_rman;
  330                 break;
  331 
  332         case SYS_RES_IOPORT:
  333                 rm = &port_rman;
  334                 break;
  335 
  336         case SYS_RES_MEMORY:
  337                 rm = &mem_rman;
  338                 break;
  339 
  340         default:
  341                 return 0;
  342         }
  343 
  344         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  345         if (rv == 0)
  346                 return 0;
  347 
  348         if (type == SYS_RES_MEMORY) {
  349                 rman_set_bustag(rv, I386_BUS_SPACE_MEM);
  350         } else if (type == SYS_RES_IOPORT) {
  351                 rman_set_bustag(rv, I386_BUS_SPACE_IO);
  352 #ifndef PC98
  353                 rman_set_bushandle(rv, rman_get_start(rv));
  354 #endif
  355         }
  356 
  357 #ifdef PC98
  358         if ((type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) &&
  359             i386_bus_space_handle_alloc(rman_get_bustag(rv),
  360               rman_get_start(rv), count, &bh) != 0) {
  361                 rman_release_resource(rv);
  362                 return 0;
  363         }
  364         rman_set_bushandle(rv, bh);
  365 #endif
  366 
  367         if (needactivate) {
  368                 if (bus_activate_resource(child, type, *rid, rv)) {
  369 #ifdef PC98
  370                         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  371                                 bh = rman_get_bushandle(rv);
  372                                 i386_bus_space_handle_free(rman_get_bustag(rv),
  373                                     bh, bh->bsh_sz);
  374                         }
  375 #endif
  376                         rman_release_resource(rv);
  377                         return 0;
  378                 }
  379         }
  380         
  381         return rv;
  382 }
  383 
  384 static int
  385 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
  386                         struct resource *r)
  387 {
  388 #ifdef PC98
  389         bus_space_handle_t bh;
  390 #endif
  391         /*
  392          * If this is a memory resource, map it into the kernel.
  393          */
  394         if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) {
  395                 caddr_t vaddr = 0;
  396 
  397                 if (rman_get_end(r) < 1024 * 1024) {
  398                         /*
  399                          * The first 1Mb is mapped at KERNBASE.
  400                          */
  401                         vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
  402                 } else {
  403                         u_int32_t paddr;
  404                         u_int32_t psize;
  405                         u_int32_t poffs;
  406 
  407                         paddr = rman_get_start(r);
  408                         psize = rman_get_size(r);
  409 
  410                         poffs = paddr - trunc_page(paddr);
  411                         vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
  412                 }
  413                 rman_set_virtual(r, vaddr);
  414 #ifdef PC98
  415                 /* PC-98: the type of bus_space_handle_t is the structure. */
  416                 bh = rman_get_bushandle(r);
  417                 bh->bsh_base = (bus_addr_t) vaddr;
  418 #else
  419                 /* IBM-PC: the type of bus_space_handle_t is u_int */
  420                 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
  421 #endif
  422         }
  423         return (rman_activate_resource(r));
  424 }
  425 
  426 static int
  427 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  428                           struct resource *r)
  429 {
  430         /*
  431          * If this is a memory resource, unmap it.
  432          */
  433         if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) &&
  434             (rman_get_end(r) >= 1024 * 1024)) {
  435                 u_int32_t psize;
  436 
  437                 psize = rman_get_size(r);
  438                 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
  439         }
  440                 
  441         return (rman_deactivate_resource(r));
  442 }
  443 
  444 static int
  445 nexus_release_resource(device_t bus, device_t child, int type, int rid,
  446                        struct resource *r)
  447 {
  448         if (rman_get_flags(r) & RF_ACTIVE) {
  449                 int error = bus_deactivate_resource(child, type, rid, r);
  450                 if (error)
  451                         return error;
  452         }
  453 #ifdef PC98
  454         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  455                 bus_space_handle_t bh;
  456 
  457                 bh = rman_get_bushandle(r);
  458                 i386_bus_space_handle_free(rman_get_bustag(r), bh, bh->bsh_sz);
  459         }
  460 #endif
  461         return (rman_release_resource(r));
  462 }
  463 
  464 /*
  465  * Currently this uses the really grody interface from kern/kern_intr.c
  466  * (which really doesn't belong in kern/anything.c).  Eventually, all of
  467  * the code in kern_intr.c and machdep_intr.c should get moved here, since
  468  * this is going to be the official interface.
  469  */
  470 static int
  471 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
  472                  int flags, void (*ihand)(void *), void *arg, void **cookiep)
  473 {
  474         int             error;
  475 
  476         /* somebody tried to setup an irq that failed to allocate! */
  477         if (irq == NULL)
  478                 panic("nexus_setup_intr: NULL irq resource!");
  479 
  480         *cookiep = 0;
  481         if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
  482                 flags |= INTR_EXCL;
  483 
  484         /*
  485          * We depend here on rman_activate_resource() being idempotent.
  486          */
  487         error = rman_activate_resource(irq);
  488         if (error)
  489                 return (error);
  490 
  491         error = intr_add_handler(device_get_nameunit(child),
  492             rman_get_start(irq), ihand, arg, flags, cookiep);
  493 
  494         return (error);
  495 }
  496 
  497 static int
  498 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  499 {
  500         return (intr_remove_handler(ih));
  501 }
  502 
  503 static int
  504 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
  505     enum intr_polarity pol)
  506 {
  507         return (intr_config_intr(irq, trig, pol));
  508 }
  509 
  510 static struct resource_list *
  511 nexus_get_reslist(device_t dev, device_t child)
  512 {
  513         struct nexus_device *ndev = DEVTONX(child);
  514 
  515         return (&ndev->nx_resources);
  516 }
  517 
  518 static int
  519 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
  520 {
  521         struct nexus_device     *ndev = DEVTONX(child);
  522         struct resource_list    *rl = &ndev->nx_resources;
  523 
  524         /* XXX this should return a success/failure indicator */
  525         resource_list_add(rl, type, rid, start, start + count - 1, count);
  526         return(0);
  527 }
  528 
  529 static int
  530 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
  531 {
  532         struct nexus_device     *ndev = DEVTONX(child);
  533         struct resource_list    *rl = &ndev->nx_resources;
  534         struct resource_list_entry *rle;
  535 
  536         rle = resource_list_find(rl, type, rid);
  537         if (!rle)
  538                 return(ENOENT);
  539         if (startp)
  540                 *startp = rle->start;
  541         if (countp)
  542                 *countp = rle->count;
  543         return(0);
  544 }
  545 
  546 static void
  547 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
  548 {
  549         struct nexus_device     *ndev = DEVTONX(child);
  550         struct resource_list    *rl = &ndev->nx_resources;
  551 
  552         resource_list_delete(rl, type, rid);
  553 }
  554 
  555 #ifdef DEV_ISA
  556 /*
  557  * Placeholder which claims PnP 'devices' which describe system 
  558  * resources.
  559  */
  560 static struct isa_pnp_id sysresource_ids[] = {
  561         { 0x010cd041 /* PNP0c01 */, "System Memory" },
  562         { 0x020cd041 /* PNP0c02 */, "System Resource" },
  563         { 0 }
  564 };
  565 
  566 static int
  567 sysresource_probe(device_t dev)
  568 {
  569         int     result;
  570         
  571         if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
  572                 device_quiet(dev);
  573         }
  574         return(result);
  575 }
  576 
  577 static int
  578 sysresource_attach(device_t dev)
  579 {
  580         return(0);
  581 }
  582 
  583 static device_method_t sysresource_methods[] = {
  584         /* Device interface */
  585         DEVMETHOD(device_probe,         sysresource_probe),
  586         DEVMETHOD(device_attach,        sysresource_attach),
  587         DEVMETHOD(device_detach,        bus_generic_detach),
  588         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  589         DEVMETHOD(device_suspend,       bus_generic_suspend),
  590         DEVMETHOD(device_resume,        bus_generic_resume),
  591         { 0, 0 }
  592 };
  593 
  594 static driver_t sysresource_driver = {
  595         "sysresource",
  596         sysresource_methods,
  597         1,              /* no softc */
  598 };
  599 
  600 static devclass_t sysresource_devclass;
  601 
  602 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);
  603 #endif /* DEV_ISA */

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