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: stable/8/sys/mips/mips/mainbus.c 223500 2011-06-24 13:41:46Z jhb $");
   46 
   47 #include "opt_cputype.h"
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/bus.h>
   52 #include <sys/kernel.h>
   53 #include <sys/module.h>
   54 #include <machine/bus.h>
   55 #include <sys/rman.h>
   56 
   57 #include <machine/vmparam.h>
   58 #include <vm/vm.h>
   59 #include <sys/lock.h>
   60 #include <sys/mutex.h>
   61 #include <vm/pmap.h>
   62 #include <machine/pmap.h>
   63 #include <machine/resource.h>
   64 
   65 static struct rman irq_rman, port_rman, mem_rman;
   66 
   67 static  int mainbus_probe(device_t);
   68 static  int mainbus_attach(device_t);
   69 static  int mainbus_print_child(device_t, device_t);
   70 static  device_t mainbus_add_child(device_t bus, u_int order, const char *name,
   71             int unit);
   72 static  struct resource *mainbus_alloc_resource(device_t, device_t, int, int *,
   73             u_long, u_long, u_long, u_int);
   74 static  int mainbus_activate_resource(device_t, device_t, int, int,
   75             struct resource *);
   76 static  int mainbus_deactivate_resource(device_t, device_t, int, int,
   77             struct resource *);
   78 static  int mainbus_release_resource(device_t, device_t, int, int,
   79             struct resource *);
   80 static  int mainbus_setup_intr(device_t, device_t, struct resource *,
   81             int flags, driver_filter_t, void (*)(void *), void *, void **);
   82 static  int mainbus_teardown_intr(device_t, device_t, struct resource *,
   83             void *);
   84 
   85 static device_method_t mainbus_methods[] = {
   86         /* Device interface */
   87         DEVMETHOD(device_probe,         mainbus_probe),
   88         DEVMETHOD(device_attach,        mainbus_attach),
   89         DEVMETHOD(device_detach,        bus_generic_detach),
   90         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   91         DEVMETHOD(device_suspend,       bus_generic_suspend),
   92         DEVMETHOD(device_resume,        bus_generic_resume),
   93 
   94         /* Bus interface */
   95         DEVMETHOD(bus_print_child,      mainbus_print_child),
   96         DEVMETHOD(bus_add_child,        mainbus_add_child),
   97         DEVMETHOD(bus_read_ivar,        bus_generic_read_ivar),
   98         DEVMETHOD(bus_write_ivar,       bus_generic_write_ivar),
   99         DEVMETHOD(bus_alloc_resource,   mainbus_alloc_resource),
  100         DEVMETHOD(bus_release_resource, mainbus_release_resource),
  101         DEVMETHOD(bus_activate_resource, mainbus_activate_resource),
  102         DEVMETHOD(bus_deactivate_resource, mainbus_deactivate_resource),
  103         DEVMETHOD(bus_setup_intr,       mainbus_setup_intr),
  104         DEVMETHOD(bus_teardown_intr,    mainbus_teardown_intr),
  105 
  106         { 0, 0 }
  107 };
  108 
  109 static driver_t mainbus_driver = {
  110         "mainbus",
  111         mainbus_methods,
  112         1,                      /* no softc */
  113 };
  114 static devclass_t mainbus_devclass;
  115 
  116 DRIVER_MODULE(mainbus, root, mainbus_driver, mainbus_devclass, 0, 0);
  117 
  118 static int
  119 mainbus_probe(device_t dev)
  120 {
  121 
  122 #ifdef  DEBUG_BRINGUP
  123         device_verbose(dev);    /* print attach message */
  124 #else
  125         device_quiet(dev);      /* suppress attach message for neatness */
  126 #endif
  127 
  128         irq_rman.rm_start = 0;
  129         irq_rman.rm_type = RMAN_ARRAY;
  130         irq_rman.rm_descr = "Interrupt request lines";
  131         irq_rman.rm_end = 15;
  132         if (rman_init(&irq_rman) ||
  133             rman_manage_region(&irq_rman, irq_rman.rm_start, irq_rman.rm_end))
  134                 panic("mainbus_probe irq_rman");
  135 
  136         /*
  137          * IO ports and Memory truely are global at this level,
  138          * as are APIC interrupts (however many IO APICS there turn out
  139          * to be on large systems..)
  140          */
  141         port_rman.rm_start = 0;
  142         port_rman.rm_end = 0xffff;
  143         port_rman.rm_type = RMAN_ARRAY;
  144         port_rman.rm_descr = "I/O ports";
  145         if (rman_init(&port_rman) || rman_manage_region(&port_rman, 0, 0xffff))
  146                 panic("mainbus_probe port_rman");
  147 
  148         mem_rman.rm_start = 0;
  149         mem_rman.rm_end = ~0ul;
  150         mem_rman.rm_type = RMAN_ARRAY;
  151         mem_rman.rm_descr = "I/O memory addresses";
  152         if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0))
  153                 panic("mainbus_probe mem_rman");
  154 
  155         return bus_generic_probe(dev);
  156 }
  157 
  158 static int
  159 mainbus_attach(device_t dev)
  160 {
  161         /*
  162          * First, deal with the children we know about already
  163          */
  164         bus_generic_attach(dev);
  165 
  166         return 0;
  167 }
  168 
  169 static int
  170 mainbus_print_child(device_t bus, device_t child)
  171 {
  172         int retval = 0;
  173 
  174         retval += bus_print_child_header(bus, child);
  175         retval += printf(" on motherboard\n");
  176 
  177         return (retval);
  178 }
  179 
  180 static device_t
  181 mainbus_add_child(device_t bus, u_int order, const char *name, int unit)
  182 {
  183         return device_add_child_ordered(bus, order, name, unit);
  184 }
  185 
  186 /*
  187  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  188  * child of one of our descendants, not a direct child of mainbus0.
  189  * (Exceptions include npx.)
  190  */
  191 static struct resource *
  192 mainbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  193     u_long start, u_long end, u_long count, u_int flags)
  194 {
  195         struct  resource *rv;
  196         struct  rman *rm;
  197         int needactivate = flags & RF_ACTIVE;
  198 
  199         flags &= ~RF_ACTIVE;
  200 
  201         switch (type) {
  202         case SYS_RES_IRQ:
  203                 rm = &irq_rman;
  204                 break;
  205 
  206         case SYS_RES_DRQ:
  207                 return 0;
  208 
  209         case SYS_RES_IOPORT:
  210                 rm = &port_rman;
  211                 break;
  212 
  213         case SYS_RES_MEMORY:
  214                 rm = &mem_rman;
  215                 break;
  216 
  217         default:
  218                 return 0;
  219         }
  220 
  221         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  222 
  223         if (rv == 0) {
  224                 printf("mainbus_alloc_resource: no resource is available\n");
  225                 return 0;
  226         }
  227 
  228         if (type == SYS_RES_MEMORY) {
  229                 rman_set_bustag(rv, MIPS_BUS_SPACE_MEM);
  230 
  231         } else if (type == SYS_RES_IOPORT) {
  232                 rman_set_bustag(rv, MIPS_BUS_SPACE_IO);
  233                 /* IBM-PC: the type of bus_space_handle_t is u_int */
  234                 rman_set_bushandle(rv, rman_get_start(rv));
  235         }
  236 
  237         if (needactivate) {
  238                 if (bus_activate_resource(child, type, *rid, rv)) {
  239                         rman_release_resource(rv);
  240                         return 0;
  241                 }
  242         }
  243 
  244         return rv;
  245 }
  246 
  247 static int
  248 mainbus_activate_resource(device_t bus, device_t child, int type, int rid,
  249                         struct resource *r)
  250 {
  251         /*
  252          * If this is a memory resource, map it into the kernel.
  253          */
  254 #ifdef CPU_CNMIPS
  255          uint64_t temp;
  256 #endif  
  257         if (rman_get_bustag(r) == MIPS_BUS_SPACE_MEM) {
  258                 caddr_t vaddr = 0;
  259                 {
  260                         u_int32_t paddr, psize, poffs;
  261 
  262                         paddr = rman_get_start(r);
  263                         psize = rman_get_size(r);
  264 
  265                         poffs = paddr - trunc_page(paddr);
  266                         vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs)
  267                             + poffs;
  268                 }
  269                 rman_set_virtual(r, vaddr);
  270 #ifdef CPU_CNMIPS
  271                 temp = 0x0000000000000000;
  272                 temp |= (uint32_t)vaddr;
  273                 rman_set_bushandle(r, (bus_space_handle_t) temp);
  274 #else           
  275                 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
  276 #endif          
  277         }
  278         return (rman_activate_resource(r));
  279 }
  280 
  281 static int
  282 mainbus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  283     struct resource *r)
  284 {
  285         /*
  286          * If this is a memory resource, unmap it.
  287          */
  288         if ((rman_get_bustag(r) == MIPS_BUS_SPACE_MEM) && (rman_get_end(r) >=
  289             1024 * 1024)) {
  290                 u_int32_t psize;
  291 
  292                 psize = rman_get_size(r);
  293                 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
  294         }
  295 
  296         return (rman_deactivate_resource(r));
  297 }
  298 
  299 static int
  300 mainbus_release_resource(device_t bus, device_t child, int type, int rid,
  301                        struct resource *r)
  302 {
  303         if (rman_get_flags(r) & RF_ACTIVE) {
  304                 int error = bus_deactivate_resource(child, type, rid, r);
  305                 if (error)
  306                         return error;
  307         }
  308         return (rman_release_resource(r));
  309 }
  310 
  311 /*
  312  * Currently this uses the really grody interface from kern/kern_intr.c
  313  * (which really doesn't belong in kern/anything.c).  Eventually, all of
  314  * the code in kern_intr.c and machdep_intr.c should get moved here, since
  315  * this is going to be the official interface.
  316  *
  317  *  Set up handler for external interrupt events.
  318  *  Use CR_INT_<n> to select the proper interrupt
  319  *  condition to dispatch on.
  320  */
  321 static int
  322 mainbus_setup_intr(device_t bus, device_t child, struct resource *irq,
  323     int flags, driver_filter_t filter, void (*ihand)(void *), void *arg,
  324     void **cookiep)
  325 {
  326         panic("can never mainbus_setup_intr");
  327 }
  328 
  329 static int
  330 mainbus_teardown_intr(device_t dev, device_t child, struct resource *r,
  331     void *ih)
  332 {
  333         panic("can never mainbus_teardown_intr");
  334 }

Cache object: e406db418a57921c90ba53a1981d0983


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