The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/mainbus.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  *      from: src/sys/i386/i386/nexus.c,v 1.26.2.5 2000/11/16 09:30:57 nyan
   30  *      JNPR: mainbus.c,v 1.2.4.1 2007/08/16 13:02:11 girish
   31  */
   32 
   33 /*
   34  * This code implements a `root mainbus' for Intel Architecture
   35  * machines.  The function of the root mainbus 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 <sys/cdefs.h>
   45 __FBSDID("$FreeBSD: releng/8.0/sys/mips/mips/mainbus.c 194082 2009-06-12 22:49:35Z jmallett $");
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/bus.h>
   50 #include <sys/kernel.h>
   51 #include <sys/module.h>
   52 #include <machine/bus.h>
   53 #include <sys/rman.h>
   54 
   55 #include <machine/vmparam.h>
   56 #include <vm/vm.h>
   57 #include <sys/lock.h>
   58 #include <sys/mutex.h>
   59 #include <vm/pmap.h>
   60 #include <machine/pmap.h>
   61 #include <machine/resource.h>
   62 
   63 static struct rman irq_rman, port_rman, mem_rman;
   64 
   65 static  int mainbus_probe(device_t);
   66 static  int mainbus_attach(device_t);
   67 static  int mainbus_print_child(device_t, device_t);
   68 static  device_t mainbus_add_child(device_t bus, int order, const char *name,
   69             int unit);
   70 static  struct resource *mainbus_alloc_resource(device_t, device_t, int, int *,
   71             u_long, u_long, u_long, u_int);
   72 static  int mainbus_activate_resource(device_t, device_t, int, int,
   73             struct resource *);
   74 static  int mainbus_deactivate_resource(device_t, device_t, int, int,
   75             struct resource *);
   76 static  int mainbus_release_resource(device_t, device_t, int, int,
   77             struct resource *);
   78 static  int mainbus_setup_intr(device_t, device_t, struct resource *,
   79             int flags, driver_filter_t, void (*)(void *), void *, void **);
   80 static  int mainbus_teardown_intr(device_t, device_t, struct resource *,
   81             void *);
   82 
   83 static device_method_t mainbus_methods[] = {
   84         /* Device interface */
   85         DEVMETHOD(device_probe,         mainbus_probe),
   86         DEVMETHOD(device_attach,        mainbus_attach),
   87         DEVMETHOD(device_detach,        bus_generic_detach),
   88         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   89         DEVMETHOD(device_suspend,       bus_generic_suspend),
   90         DEVMETHOD(device_resume,        bus_generic_resume),
   91 
   92         /* Bus interface */
   93         DEVMETHOD(bus_print_child,      mainbus_print_child),
   94         DEVMETHOD(bus_add_child,        mainbus_add_child),
   95         DEVMETHOD(bus_read_ivar,        bus_generic_read_ivar),
   96         DEVMETHOD(bus_write_ivar,       bus_generic_write_ivar),
   97         DEVMETHOD(bus_alloc_resource,   mainbus_alloc_resource),
   98         DEVMETHOD(bus_release_resource, mainbus_release_resource),
   99         DEVMETHOD(bus_activate_resource, mainbus_activate_resource),
  100         DEVMETHOD(bus_deactivate_resource, mainbus_deactivate_resource),
  101         DEVMETHOD(bus_setup_intr,       mainbus_setup_intr),
  102         DEVMETHOD(bus_teardown_intr,    mainbus_teardown_intr),
  103 
  104         { 0, 0 }
  105 };
  106 
  107 static driver_t mainbus_driver = {
  108         "mainbus",
  109         mainbus_methods,
  110         1,                      /* no softc */
  111 };
  112 static devclass_t mainbus_devclass;
  113 
  114 DRIVER_MODULE(mainbus, root, mainbus_driver, mainbus_devclass, 0, 0);
  115 
  116 static int
  117 mainbus_probe(device_t dev)
  118 {
  119 
  120 #ifdef  DEBUG_BRINGUP
  121         device_verbose(dev);    /* print attach message */
  122 #else
  123         device_quiet(dev);      /* suppress attach message for neatness */
  124 #endif
  125 
  126         irq_rman.rm_start = 0;
  127         irq_rman.rm_type = RMAN_ARRAY;
  128         irq_rman.rm_descr = "Interrupt request lines";
  129         irq_rman.rm_end = 15;
  130         if (rman_init(&irq_rman) ||
  131             rman_manage_region(&irq_rman, irq_rman.rm_start, irq_rman.rm_end))
  132                 panic("mainbus_probe irq_rman");
  133 
  134         /*
  135          * IO ports and Memory truely are global at this level,
  136          * as are APIC interrupts (however many IO APICS there turn out
  137          * to be on large systems..)
  138          */
  139         port_rman.rm_start = 0;
  140         port_rman.rm_end = 0xffff;
  141         port_rman.rm_type = RMAN_ARRAY;
  142         port_rman.rm_descr = "I/O ports";
  143         if (rman_init(&port_rman) || rman_manage_region(&port_rman, 0, 0xffff))
  144                 panic("mainbus_probe port_rman");
  145 
  146         mem_rman.rm_start = 0;
  147         mem_rman.rm_end = ~0u;
  148         mem_rman.rm_type = RMAN_ARRAY;
  149         mem_rman.rm_descr = "I/O memory addresses";
  150         if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0))
  151                 panic("mainbus_probe mem_rman");
  152 
  153         return bus_generic_probe(dev);
  154 }
  155 
  156 static int
  157 mainbus_attach(device_t dev)
  158 {
  159         /*
  160          * First, deal with the children we know about already
  161          */
  162         bus_generic_attach(dev);
  163 
  164         return 0;
  165 }
  166 
  167 static int
  168 mainbus_print_child(device_t bus, device_t child)
  169 {
  170         int retval = 0;
  171 
  172         retval += bus_print_child_header(bus, child);
  173         retval += printf(" on motherboard\n");
  174 
  175         return (retval);
  176 }
  177 
  178 static device_t
  179 mainbus_add_child(device_t bus, int order, const char *name, int unit)
  180 {
  181         return device_add_child_ordered(bus, order, name, unit);
  182 }
  183 
  184 /*
  185  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  186  * child of one of our descendants, not a direct child of mainbus0.
  187  * (Exceptions include npx.)
  188  */
  189 static struct resource *
  190 mainbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  191     u_long start, u_long end, u_long count, u_int flags)
  192 {
  193         struct  resource *rv;
  194         struct  rman *rm;
  195         int needactivate = flags & RF_ACTIVE;
  196 
  197         flags &= ~RF_ACTIVE;
  198 
  199         switch (type) {
  200         case SYS_RES_IRQ:
  201                 rm = &irq_rman;
  202                 break;
  203 
  204         case SYS_RES_DRQ:
  205                 return 0;
  206 
  207         case SYS_RES_IOPORT:
  208                 rm = &port_rman;
  209                 break;
  210 
  211         case SYS_RES_MEMORY:
  212                 rm = &mem_rman;
  213                 break;
  214 
  215         default:
  216                 return 0;
  217         }
  218 
  219         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  220 
  221         if (rv == 0) {
  222                 printf("mainbus_alloc_resource: no resource is available\n");
  223                 return 0;
  224         }
  225 
  226         if (type == SYS_RES_MEMORY) {
  227                 rman_set_bustag(rv, MIPS_BUS_SPACE_MEM);
  228 
  229         } else if (type == SYS_RES_IOPORT) {
  230                 rman_set_bustag(rv, MIPS_BUS_SPACE_IO);
  231                 /* IBM-PC: the type of bus_space_handle_t is u_int */
  232                 rman_set_bushandle(rv, rman_get_start(rv));
  233         }
  234 
  235         if (needactivate) {
  236                 if (bus_activate_resource(child, type, *rid, rv)) {
  237                         rman_release_resource(rv);
  238                         return 0;
  239                 }
  240         }
  241 
  242         return rv;
  243 }
  244 
  245 static int
  246 mainbus_activate_resource(device_t bus, device_t child, int type, int rid,
  247                         struct resource *r)
  248 {
  249         /*
  250          * If this is a memory resource, map it into the kernel.
  251          */
  252 #ifdef TARGET_OCTEON
  253          uint64_t temp;
  254 #endif  
  255         if (rman_get_bustag(r) == MIPS_BUS_SPACE_MEM) {
  256                 caddr_t vaddr = 0;
  257                 {
  258                         u_int32_t paddr, psize, poffs;
  259 
  260                         paddr = rman_get_start(r);
  261                         psize = rman_get_size(r);
  262 
  263                         poffs = paddr - trunc_page(paddr);
  264                         vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs)
  265                             + poffs;
  266                 }
  267                 rman_set_virtual(r, vaddr);
  268                 /* IBM-PC: the type of bus_space_handle_t is u_int */
  269 #ifdef TARGET_OCTEON
  270                 temp = 0x0000000000000000;
  271                 temp |= (uint32_t)vaddr;
  272                 rman_set_bushandle(r, (bus_space_handle_t) temp);
  273 #else           
  274                 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
  275 #endif          
  276         }
  277         return (rman_activate_resource(r));
  278 }
  279 
  280 static int
  281 mainbus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  282     struct resource *r)
  283 {
  284         /*
  285          * If this is a memory resource, unmap it.
  286          */
  287         if ((rman_get_bustag(r) == MIPS_BUS_SPACE_MEM) && (rman_get_end(r) >=
  288             1024 * 1024)) {
  289                 u_int32_t psize;
  290 
  291                 psize = rman_get_size(r);
  292                 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
  293         }
  294 
  295         return (rman_deactivate_resource(r));
  296 }
  297 
  298 static int
  299 mainbus_release_resource(device_t bus, device_t child, int type, int rid,
  300                        struct resource *r)
  301 {
  302         if (rman_get_flags(r) & RF_ACTIVE) {
  303                 int error = bus_deactivate_resource(child, type, rid, r);
  304                 if (error)
  305                         return error;
  306         }
  307         return (rman_release_resource(r));
  308 }
  309 
  310 /*
  311  * Currently this uses the really grody interface from kern/kern_intr.c
  312  * (which really doesn't belong in kern/anything.c).  Eventually, all of
  313  * the code in kern_intr.c and machdep_intr.c should get moved here, since
  314  * this is going to be the official interface.
  315  *
  316  *  Set up handler for external interrupt events.
  317  *  Use CR_INT_<n> to select the proper interrupt
  318  *  condition to dispatch on.
  319  */
  320 static int
  321 mainbus_setup_intr(device_t bus, device_t child, struct resource *irq,
  322     int flags, driver_filter_t filter, void (*ihand)(void *), void *arg,
  323     void **cookiep)
  324 {
  325         panic("can never mainbus_setup_intr");
  326 }
  327 
  328 static int
  329 mainbus_teardown_intr(device_t dev, device_t child, struct resource *r,
  330     void *ih)
  331 {
  332         panic("can never mainbus_teardown_intr");
  333 }

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