The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/mips/idt/obio.c

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    1 /*-
    2  * Copyright (c) 2007, Oleksandr Tymoshenko <gonzo@freebsd.org>
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  * 3. All advertising materials mentioning features or use of this software
   13  *    must display the following acknowledgement:
   14  *      This product includes software developed for the NetBSD Project by
   15  *      Wasabi Systems, Inc.
   16  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
   17  *    or promote products derived from this software without specific prior
   18  *    written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
   24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/8.0/sys/mips/idt/obio.c 183173 2008-09-19 04:10:09Z imp $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/bus.h>
   39 #include <sys/interrupt.h>
   40 #include <sys/kernel.h>
   41 #include <sys/module.h>
   42 #include <sys/rman.h>
   43 #include <sys/malloc.h>
   44 
   45 #include <machine/bus.h>
   46 
   47 #include <mips/idt/idtreg.h>
   48 #include <mips/idt/obiovar.h>
   49 
   50 #define ICU_REG_READ(o) \
   51     *((volatile uint32_t *)MIPS_PHYS_TO_KSEG1(IDT_BASE_ICU + (o)))
   52 #define ICU_REG_WRITE(o,v) (ICU_REG_READ(o)) = (v)
   53 
   54 #define GPIO_REG_READ(o) \
   55     *((volatile uint32_t *)MIPS_PHYS_TO_KSEG1(IDT_BASE_GPIO + (o)))
   56 #define GPIO_REG_WRITE(o,v) (GPIO_REG_READ(o)) = (v)
   57 
   58 static int      obio_activate_resource(device_t, device_t, int, int,
   59                     struct resource *);
   60 static device_t obio_add_child(device_t, int, const char *, int);
   61 static struct resource *
   62                 obio_alloc_resource(device_t, device_t, int, int *, u_long,
   63                     u_long, u_long, u_int);
   64 static int      obio_attach(device_t);
   65 static int      obio_deactivate_resource(device_t, device_t, int, int,
   66                     struct resource *);
   67 static struct resource_list *
   68                 obio_get_resource_list(device_t, device_t);
   69 static void     obio_hinted_child(device_t, const char *, int);
   70 static int      obio_intr(void *);
   71 static int      obio_probe(device_t);
   72 static int      obio_release_resource(device_t, device_t, int, int,
   73                     struct resource *);
   74 static int      obio_setup_intr(device_t, device_t, struct resource *, int,
   75                     driver_filter_t *, driver_intr_t *, void *, void **);
   76 static int      obio_teardown_intr(device_t, device_t, struct resource *,
   77                     void *);
   78 
   79 static void obio_mask_irq(unsigned int irq)
   80 {
   81         int ip_bit, mask, mask_register;
   82 
   83         /* mask IRQ */
   84         mask_register = ICU_IRQ_MASK_REG(irq);
   85         ip_bit = ICU_IP_BIT(irq);
   86 
   87         mask = ICU_REG_READ(mask_register);
   88         ICU_REG_WRITE(mask_register, mask | ip_bit);
   89 }
   90 
   91 static void obio_unmask_irq(unsigned int irq)
   92 {
   93         int ip_bit, mask, mask_register;
   94 
   95         /* unmask IRQ */
   96         mask_register = ICU_IRQ_MASK_REG(irq);
   97         ip_bit = ICU_IP_BIT(irq);
   98 
   99         mask = ICU_REG_READ(mask_register);
  100         ICU_REG_WRITE(mask_register, mask & ~ip_bit);
  101 }
  102 
  103 static int
  104 obio_probe(device_t dev)
  105 {
  106 
  107         return (0);
  108 }
  109 
  110 static int
  111 obio_attach(device_t dev)
  112 {
  113         struct obio_softc *sc = device_get_softc(dev);
  114         int rid, irq;
  115 
  116         sc->oba_mem_rman.rm_type = RMAN_ARRAY;
  117         sc->oba_mem_rman.rm_descr = "OBIO memeory";
  118         if (rman_init(&sc->oba_mem_rman) != 0 ||
  119             rman_manage_region(&sc->oba_mem_rman, OBIO_MEM_START,
  120                 OBIO_MEM_START + OBIO_MEM_SIZE) != 0)
  121                 panic("obio_attach: failed to set up I/O rman");
  122 
  123         sc->oba_irq_rman.rm_type = RMAN_ARRAY;
  124         sc->oba_irq_rman.rm_descr = "OBIO IRQ";
  125 
  126         if (rman_init(&sc->oba_irq_rman) != 0 ||
  127             rman_manage_region(&sc->oba_irq_rman, IRQ_BASE, IRQ_END) != 0)
  128                 panic("obio_attach: failed to set up IRQ rman");
  129 
  130         /* Hook up our interrupt handlers. We should handle IRQ0..IRQ4*/
  131         for(irq = 0; irq < 5; irq++) {
  132                 if ((sc->sc_irq[irq] = bus_alloc_resource(dev, SYS_RES_IRQ, 
  133                     &rid, irq, irq, 1, RF_SHAREABLE | RF_ACTIVE)) == NULL) {
  134                         device_printf(dev, "unable to allocate IRQ resource\n");
  135                         return (ENXIO);
  136                 }
  137 
  138                 if ((bus_setup_intr(dev, sc->sc_irq[irq], INTR_TYPE_MISC, 
  139                     obio_intr, NULL, sc, &sc->sc_ih[irq]))) {
  140                         device_printf(dev,
  141                             "WARNING: unable to register interrupt handler\n");
  142                         return (ENXIO);
  143                 }
  144         }
  145 
  146         bus_generic_probe(dev);
  147         bus_enumerate_hinted_children(dev);
  148         bus_generic_attach(dev);
  149 
  150         return (0);
  151 }
  152 
  153 static struct resource *
  154 obio_alloc_resource(device_t bus, device_t child, int type, int *rid,
  155     u_long start, u_long end, u_long count, u_int flags)
  156 {
  157         struct obio_softc               *sc = device_get_softc(bus);
  158         struct obio_ivar                *ivar = device_get_ivars(child);
  159         struct resource                 *rv;
  160         struct resource_list_entry      *rle;
  161         struct rman                     *rm;
  162         int                              isdefault, needactivate, passthrough;
  163 
  164         isdefault = (start == 0UL && end == ~0UL);
  165         needactivate = flags & RF_ACTIVE;
  166         passthrough = (device_get_parent(child) != bus);
  167         rle = NULL;
  168 
  169         if (passthrough)
  170                 return (BUS_ALLOC_RESOURCE(device_get_parent(bus), child, type,
  171                     rid, start, end, count, flags));
  172 
  173         /*
  174          * If this is an allocation of the "default" range for a given RID,
  175          * and we know what the resources for this device are (ie. they aren't
  176          * maintained by a child bus), then work out the start/end values.
  177          */
  178         if (isdefault) {
  179                 rle = resource_list_find(&ivar->resources, type, *rid);
  180                 if (rle == NULL)
  181                         return (NULL);
  182                 if (rle->res != NULL) {
  183                         panic("%s: resource entry is busy", __func__);
  184                 }
  185                 start = rle->start;
  186                 end = rle->end;
  187                 count = rle->count;
  188         }
  189 
  190         switch (type) {
  191         case SYS_RES_IRQ:
  192                 rm = &sc->oba_irq_rman;
  193                 break;
  194         case SYS_RES_MEMORY:
  195                 rm = &sc->oba_mem_rman;
  196                 break;
  197         default:
  198                 printf("%s: unknown resource type %d\n", __func__, type);
  199                 return (0);
  200         }
  201 
  202         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  203         if (rv == 0) {
  204                 printf("%s: could not reserve resource\n", __func__);
  205                 return (0);
  206         }
  207 
  208         rman_set_rid(rv, *rid);
  209 
  210         if (needactivate) {
  211                 if (bus_activate_resource(child, type, *rid, rv)) {
  212                         printf("%s: could not activate resource\n", __func__);
  213                         rman_release_resource(rv);
  214                         return (0);
  215                 }
  216         }
  217 
  218         return (rv);
  219 }
  220 
  221 static int
  222 obio_activate_resource(device_t bus, device_t child, int type, int rid,
  223     struct resource *r)
  224 {
  225 
  226         /* XXX: should we mask/unmask IRQ here? */
  227         return (BUS_ACTIVATE_RESOURCE(device_get_parent(bus), child,
  228                 type, rid, r));
  229 }
  230 
  231 static int
  232 obio_deactivate_resource(device_t bus, device_t child, int type, int rid,
  233     struct resource *r)
  234 {
  235 
  236         /* XXX: should we mask/unmask IRQ here? */
  237         return (BUS_DEACTIVATE_RESOURCE(device_get_parent(bus), child,
  238                 type, rid, r));
  239 }
  240 
  241 static int
  242 obio_release_resource(device_t dev, device_t child, int type,
  243     int rid, struct resource *r)
  244 {
  245         struct resource_list *rl;
  246         struct resource_list_entry *rle;
  247 
  248         rl = obio_get_resource_list(dev, child);
  249         if (rl == NULL)
  250                 return (EINVAL);
  251         rle = resource_list_find(rl, type, rid);
  252         if (rle == NULL)
  253                 return (EINVAL);
  254         rman_release_resource(r);
  255         rle->res = NULL;
  256 
  257         return (0);
  258 }
  259 
  260 static int
  261 obio_setup_intr(device_t dev, device_t child, struct resource *ires,
  262                 int flags, driver_filter_t *filt, driver_intr_t *handler,
  263                 void *arg, void **cookiep)
  264 {
  265         struct obio_softc *sc = device_get_softc(dev);
  266         struct intr_event *event;
  267         int irq, ip_bit, error, mask, mask_register;
  268 
  269         irq = rman_get_start(ires);
  270 
  271         if (irq >= NIRQS)
  272                 panic("%s: bad irq %d", __func__, irq);
  273 
  274         event = sc->sc_eventstab[irq];
  275         if (event == NULL) {
  276                 error = intr_event_create(&event, (void *)irq, 0, irq, 
  277                     (mask_fn)obio_mask_irq, (mask_fn)obio_unmask_irq,
  278                     NULL, NULL,
  279                     "obio intr%d:", irq);
  280 
  281                 sc->sc_eventstab[irq] = event;
  282         }
  283 
  284         intr_event_add_handler(event, device_get_nameunit(child), filt,
  285             handler, arg, intr_priority(flags), flags, cookiep);
  286 
  287         /* unmask IRQ */
  288         mask_register = ICU_IRQ_MASK_REG(irq);
  289         ip_bit = ICU_IP_BIT(irq);
  290 
  291         mask = ICU_REG_READ(mask_register);
  292         ICU_REG_WRITE(mask_register, mask & ~ip_bit);
  293 
  294         return (0);
  295 }
  296 
  297 static int
  298 obio_teardown_intr(device_t dev, device_t child, struct resource *ires,
  299     void *cookie)
  300 {
  301         struct obio_softc *sc = device_get_softc(dev);
  302         int irq, result;
  303         uint32_t mask_register, mask, ip_bit;
  304 
  305         irq = rman_get_start(ires);
  306         if (irq >= NIRQS)
  307                 panic("%s: bad irq %d", __func__, irq);
  308 
  309         if (sc->sc_eventstab[irq] == NULL)
  310                 panic("Trying to teardown unoccupied IRQ");
  311 
  312         /* mask IRQ */
  313         mask_register = ICU_IRQ_MASK_REG(irq);
  314         ip_bit = ICU_IP_BIT(irq);
  315 
  316         mask = ICU_REG_READ(mask_register);
  317         ICU_REG_WRITE(mask_register, mask | ip_bit);
  318 
  319         result = intr_event_remove_handler(cookie);
  320         if (!result)
  321                 sc->sc_eventstab[irq] = NULL;
  322 
  323         return (result);
  324 }
  325 
  326 static int
  327 obio_intr(void *arg)
  328 {
  329         struct obio_softc *sc = arg;
  330         struct intr_event *event;
  331         uint32_t irqstat, ipend, imask, xpend;
  332         int irq, thread, group, i;
  333 
  334         irqstat = 0;
  335         irq = 0;
  336         for (group = 2; group <= 6; group++) {
  337                 ipend = ICU_REG_READ(ICU_GROUP_IPEND_REG(group));
  338                 imask = ICU_REG_READ(ICU_GROUP_MASK_REG(group));
  339                 xpend = ipend;
  340                 ipend &= ~imask;
  341 
  342                 while ((i = fls(xpend)) != 0) {
  343                         xpend &= ~(1 << (i - 1));
  344                         irq = IP_IRQ(group, i - 1);
  345                 }
  346         
  347                 while ((i = fls(ipend)) != 0) {
  348                         ipend &= ~(1 << (i - 1));
  349                         irq = IP_IRQ(group, i - 1);
  350                         event = sc->sc_eventstab[irq];
  351                         thread = 0;
  352                         if (!event || TAILQ_EMPTY(&event->ie_handlers)) {
  353                                 /* TODO: Log stray IRQs */
  354                                 continue;
  355                         }
  356 
  357                         /* TODO: frame instead of NULL? */
  358                         intr_event_handle(event, NULL);
  359                         /* XXX: Log stray IRQs */
  360                 }
  361         }
  362 #if 0
  363         ipend = ICU_REG_READ(ICU_IPEND2);
  364         printf("ipend2 = %08x!\n", ipend);
  365 
  366         ipend = ICU_REG_READ(ICU_IPEND3);
  367         printf("ipend3 = %08x!\n", ipend);
  368 
  369         ipend = ICU_REG_READ(ICU_IPEND4);
  370         printf("ipend4 = %08x!\n", ipend);
  371         ipend = ICU_REG_READ(ICU_IPEND5);
  372         printf("ipend5 = %08x!\n", ipend);
  373 
  374         ipend = ICU_REG_READ(ICU_IPEND6);
  375         printf("ipend6 = %08x!\n", ipend);
  376 #endif
  377         while (irqstat != 0) {
  378                 if ((irqstat & 1) == 1) {
  379                 }
  380 
  381                 irq++;
  382                 irqstat >>= 1;
  383         }
  384 
  385         return (FILTER_HANDLED);
  386 }
  387 
  388 static void
  389 obio_hinted_child(device_t bus, const char *dname, int dunit)
  390 {
  391         device_t                child;
  392         long                    maddr;
  393         int                     msize;
  394         int                     irq;
  395         int                     result;
  396 
  397         child = BUS_ADD_CHILD(bus, 0, dname, dunit);
  398 
  399         /*
  400          * Set hard-wired resources for hinted child using
  401          * specific RIDs.
  402          */
  403         resource_long_value(dname, dunit, "maddr", &maddr);
  404         resource_int_value(dname, dunit, "msize", &msize);
  405 
  406 
  407         result = bus_set_resource(child, SYS_RES_MEMORY, 0,
  408             maddr, msize);
  409         if (result != 0)
  410                 device_printf(bus, "warning: bus_set_resource() failed\n");
  411 
  412         if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
  413                 result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
  414                 if (result != 0)
  415                         device_printf(bus,
  416                             "warning: bus_set_resource() failed\n");
  417         }
  418 }
  419 
  420 static device_t
  421 obio_add_child(device_t bus, int order, const char *name, int unit)
  422 {
  423         device_t                child;
  424         struct obio_ivar        *ivar;
  425 
  426         ivar = malloc(sizeof(struct obio_ivar), M_DEVBUF, M_WAITOK | M_ZERO);
  427         if (ivar == NULL) {
  428                 printf("Failed to allocate ivar\n");
  429                 return (0);
  430         }
  431         resource_list_init(&ivar->resources);
  432 
  433         child = device_add_child_ordered(bus, order, name, unit);
  434         if (child == NULL) {
  435                 printf("Can't add child %s%d ordered\n", name, unit);
  436                 return (0);
  437         }
  438 
  439         device_set_ivars(child, ivar);
  440 
  441         return (child);
  442 }
  443 
  444 /*
  445  * Helper routine for bus_generic_rl_get_resource/bus_generic_rl_set_resource
  446  * Provides pointer to resource_list for these routines
  447  */
  448 static struct resource_list *
  449 obio_get_resource_list(device_t dev, device_t child)
  450 {
  451         struct obio_ivar *ivar;
  452 
  453         ivar = device_get_ivars(child);
  454         return (&(ivar->resources));
  455 }
  456 
  457 static device_method_t obio_methods[] = {
  458         DEVMETHOD(bus_activate_resource,        obio_activate_resource),
  459         DEVMETHOD(bus_add_child,                obio_add_child),
  460         DEVMETHOD(bus_alloc_resource,           obio_alloc_resource),
  461         DEVMETHOD(bus_deactivate_resource,      obio_deactivate_resource),
  462         DEVMETHOD(bus_get_resource_list,        obio_get_resource_list),
  463         DEVMETHOD(bus_hinted_child,             obio_hinted_child),
  464         DEVMETHOD(bus_release_resource,         obio_release_resource),
  465         DEVMETHOD(bus_setup_intr,               obio_setup_intr),
  466         DEVMETHOD(bus_teardown_intr,            obio_teardown_intr),
  467         DEVMETHOD(device_attach,                obio_attach),
  468         DEVMETHOD(device_probe,                 obio_probe),
  469         DEVMETHOD(bus_get_resource,             bus_generic_rl_get_resource),
  470         DEVMETHOD(bus_set_resource,             bus_generic_rl_set_resource),
  471 
  472         {0, 0},
  473 };
  474 
  475 static driver_t obio_driver = {
  476         "obio",
  477         obio_methods,
  478         sizeof(struct obio_softc),
  479 };
  480 static devclass_t obio_devclass;
  481 
  482 DRIVER_MODULE(obio, nexus, obio_driver, obio_devclass, 0, 0);

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