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: stable/8/sys/mips/idt/obio.c 215938 2010-11-27 12:26:40Z jchandra $");
   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, u_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 
   80 obio_mask_irq(void *arg)
   81 {
   82         unsigned int irq = (unsigned int)arg;
   83         int ip_bit, mask, mask_register;
   84 
   85         /* mask IRQ */
   86         mask_register = ICU_IRQ_MASK_REG(irq);
   87         ip_bit = ICU_IP_BIT(irq);
   88 
   89         mask = ICU_REG_READ(mask_register);
   90         ICU_REG_WRITE(mask_register, mask | ip_bit);
   91 }
   92 
   93 static void 
   94 obio_unmask_irq(void *arg)
   95 {
   96         unsigned int irq = (unsigned int)arg;
   97         int ip_bit, mask, mask_register;
   98 
   99         /* unmask IRQ */
  100         mask_register = ICU_IRQ_MASK_REG(irq);
  101         ip_bit = ICU_IP_BIT(irq);
  102 
  103         mask = ICU_REG_READ(mask_register);
  104         ICU_REG_WRITE(mask_register, mask & ~ip_bit);
  105 }
  106 
  107 static int
  108 obio_probe(device_t dev)
  109 {
  110 
  111         return (0);
  112 }
  113 
  114 static int
  115 obio_attach(device_t dev)
  116 {
  117         struct obio_softc *sc = device_get_softc(dev);
  118         int rid, irq;
  119 
  120         sc->oba_mem_rman.rm_type = RMAN_ARRAY;
  121         sc->oba_mem_rman.rm_descr = "OBIO memeory";
  122         if (rman_init(&sc->oba_mem_rman) != 0 ||
  123             rman_manage_region(&sc->oba_mem_rman, OBIO_MEM_START,
  124                 OBIO_MEM_START + OBIO_MEM_SIZE) != 0)
  125                 panic("obio_attach: failed to set up I/O rman");
  126 
  127         sc->oba_irq_rman.rm_type = RMAN_ARRAY;
  128         sc->oba_irq_rman.rm_descr = "OBIO IRQ";
  129 
  130         if (rman_init(&sc->oba_irq_rman) != 0 ||
  131             rman_manage_region(&sc->oba_irq_rman, IRQ_BASE, IRQ_END) != 0)
  132                 panic("obio_attach: failed to set up IRQ rman");
  133 
  134         /* Hook up our interrupt handlers. We should handle IRQ0..IRQ4*/
  135         for(irq = 0; irq < 5; irq++) {
  136                 if ((sc->sc_irq[irq] = bus_alloc_resource(dev, SYS_RES_IRQ, 
  137                     &rid, irq, irq, 1, RF_SHAREABLE | RF_ACTIVE)) == NULL) {
  138                         device_printf(dev, "unable to allocate IRQ resource\n");
  139                         return (ENXIO);
  140                 }
  141 
  142                 if ((bus_setup_intr(dev, sc->sc_irq[irq], INTR_TYPE_MISC, 
  143                     obio_intr, NULL, sc, &sc->sc_ih[irq]))) {
  144                         device_printf(dev,
  145                             "WARNING: unable to register interrupt handler\n");
  146                         return (ENXIO);
  147                 }
  148         }
  149 
  150         bus_generic_probe(dev);
  151         bus_enumerate_hinted_children(dev);
  152         bus_generic_attach(dev);
  153 
  154         return (0);
  155 }
  156 
  157 static struct resource *
  158 obio_alloc_resource(device_t bus, device_t child, int type, int *rid,
  159     u_long start, u_long end, u_long count, u_int flags)
  160 {
  161         struct obio_softc               *sc = device_get_softc(bus);
  162         struct obio_ivar                *ivar = device_get_ivars(child);
  163         struct resource                 *rv;
  164         struct resource_list_entry      *rle;
  165         struct rman                     *rm;
  166         int                              isdefault, needactivate, passthrough;
  167 
  168         isdefault = (start == 0UL && end == ~0UL);
  169         needactivate = flags & RF_ACTIVE;
  170         passthrough = (device_get_parent(child) != bus);
  171         rle = NULL;
  172 
  173         if (passthrough)
  174                 return (BUS_ALLOC_RESOURCE(device_get_parent(bus), child, type,
  175                     rid, start, end, count, flags));
  176 
  177         /*
  178          * If this is an allocation of the "default" range for a given RID,
  179          * and we know what the resources for this device are (ie. they aren't
  180          * maintained by a child bus), then work out the start/end values.
  181          */
  182         if (isdefault) {
  183                 rle = resource_list_find(&ivar->resources, type, *rid);
  184                 if (rle == NULL)
  185                         return (NULL);
  186                 if (rle->res != NULL) {
  187                         panic("%s: resource entry is busy", __func__);
  188                 }
  189                 start = rle->start;
  190                 end = rle->end;
  191                 count = rle->count;
  192         }
  193 
  194         switch (type) {
  195         case SYS_RES_IRQ:
  196                 rm = &sc->oba_irq_rman;
  197                 break;
  198         case SYS_RES_MEMORY:
  199                 rm = &sc->oba_mem_rman;
  200                 break;
  201         default:
  202                 printf("%s: unknown resource type %d\n", __func__, type);
  203                 return (0);
  204         }
  205 
  206         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  207         if (rv == 0) {
  208                 printf("%s: could not reserve resource\n", __func__);
  209                 return (0);
  210         }
  211 
  212         rman_set_rid(rv, *rid);
  213 
  214         if (needactivate) {
  215                 if (bus_activate_resource(child, type, *rid, rv)) {
  216                         printf("%s: could not activate resource\n", __func__);
  217                         rman_release_resource(rv);
  218                         return (0);
  219                 }
  220         }
  221 
  222         return (rv);
  223 }
  224 
  225 static int
  226 obio_activate_resource(device_t bus, device_t child, int type, int rid,
  227     struct resource *r)
  228 {
  229 
  230         /* XXX: should we mask/unmask IRQ here? */
  231         return (BUS_ACTIVATE_RESOURCE(device_get_parent(bus), child,
  232                 type, rid, r));
  233 }
  234 
  235 static int
  236 obio_deactivate_resource(device_t bus, device_t child, int type, int rid,
  237     struct resource *r)
  238 {
  239 
  240         /* XXX: should we mask/unmask IRQ here? */
  241         return (BUS_DEACTIVATE_RESOURCE(device_get_parent(bus), child,
  242                 type, rid, r));
  243 }
  244 
  245 static int
  246 obio_release_resource(device_t dev, device_t child, int type,
  247     int rid, struct resource *r)
  248 {
  249         struct resource_list *rl;
  250         struct resource_list_entry *rle;
  251 
  252         rl = obio_get_resource_list(dev, child);
  253         if (rl == NULL)
  254                 return (EINVAL);
  255         rle = resource_list_find(rl, type, rid);
  256         if (rle == NULL)
  257                 return (EINVAL);
  258         rman_release_resource(r);
  259         rle->res = NULL;
  260 
  261         return (0);
  262 }
  263 
  264 static int
  265 obio_setup_intr(device_t dev, device_t child, struct resource *ires,
  266                 int flags, driver_filter_t *filt, driver_intr_t *handler,
  267                 void *arg, void **cookiep)
  268 {
  269         struct obio_softc *sc = device_get_softc(dev);
  270         struct intr_event *event;
  271         int irq, ip_bit, error, mask, mask_register;
  272 
  273         irq = rman_get_start(ires);
  274 
  275         if (irq >= NIRQS)
  276                 panic("%s: bad irq %d", __func__, irq);
  277 
  278         event = sc->sc_eventstab[irq];
  279         if (event == NULL) {
  280                 error = intr_event_create(&event, (void *)irq, 0, irq, 
  281                     obio_mask_irq, obio_unmask_irq,
  282                     NULL, NULL,
  283                     "obio intr%d:", irq);
  284 
  285                 sc->sc_eventstab[irq] = event;
  286         }
  287 
  288         intr_event_add_handler(event, device_get_nameunit(child), filt,
  289             handler, arg, intr_priority(flags), flags, cookiep);
  290 
  291         /* unmask IRQ */
  292         mask_register = ICU_IRQ_MASK_REG(irq);
  293         ip_bit = ICU_IP_BIT(irq);
  294 
  295         mask = ICU_REG_READ(mask_register);
  296         ICU_REG_WRITE(mask_register, mask & ~ip_bit);
  297 
  298         return (0);
  299 }
  300 
  301 static int
  302 obio_teardown_intr(device_t dev, device_t child, struct resource *ires,
  303     void *cookie)
  304 {
  305         struct obio_softc *sc = device_get_softc(dev);
  306         int irq, result;
  307         uint32_t mask_register, mask, ip_bit;
  308 
  309         irq = rman_get_start(ires);
  310         if (irq >= NIRQS)
  311                 panic("%s: bad irq %d", __func__, irq);
  312 
  313         if (sc->sc_eventstab[irq] == NULL)
  314                 panic("Trying to teardown unoccupied IRQ");
  315 
  316         /* mask IRQ */
  317         mask_register = ICU_IRQ_MASK_REG(irq);
  318         ip_bit = ICU_IP_BIT(irq);
  319 
  320         mask = ICU_REG_READ(mask_register);
  321         ICU_REG_WRITE(mask_register, mask | ip_bit);
  322 
  323         result = intr_event_remove_handler(cookie);
  324         if (!result)
  325                 sc->sc_eventstab[irq] = NULL;
  326 
  327         return (result);
  328 }
  329 
  330 static int
  331 obio_intr(void *arg)
  332 {
  333         struct obio_softc *sc = arg;
  334         struct intr_event *event;
  335         uint32_t irqstat, ipend, imask, xpend;
  336         int irq, thread, group, i;
  337 
  338         irqstat = 0;
  339         irq = 0;
  340         for (group = 2; group <= 6; group++) {
  341                 ipend = ICU_REG_READ(ICU_GROUP_IPEND_REG(group));
  342                 imask = ICU_REG_READ(ICU_GROUP_MASK_REG(group));
  343                 xpend = ipend;
  344                 ipend &= ~imask;
  345 
  346                 while ((i = fls(xpend)) != 0) {
  347                         xpend &= ~(1 << (i - 1));
  348                         irq = IP_IRQ(group, i - 1);
  349                 }
  350         
  351                 while ((i = fls(ipend)) != 0) {
  352                         ipend &= ~(1 << (i - 1));
  353                         irq = IP_IRQ(group, i - 1);
  354                         event = sc->sc_eventstab[irq];
  355                         thread = 0;
  356                         if (!event || TAILQ_EMPTY(&event->ie_handlers)) {
  357                                 /* TODO: Log stray IRQs */
  358                                 continue;
  359                         }
  360 
  361                         /* TODO: frame instead of NULL? */
  362                         intr_event_handle(event, NULL);
  363                         /* XXX: Log stray IRQs */
  364                 }
  365         }
  366 #if 0
  367         ipend = ICU_REG_READ(ICU_IPEND2);
  368         printf("ipend2 = %08x!\n", ipend);
  369 
  370         ipend = ICU_REG_READ(ICU_IPEND3);
  371         printf("ipend3 = %08x!\n", ipend);
  372 
  373         ipend = ICU_REG_READ(ICU_IPEND4);
  374         printf("ipend4 = %08x!\n", ipend);
  375         ipend = ICU_REG_READ(ICU_IPEND5);
  376         printf("ipend5 = %08x!\n", ipend);
  377 
  378         ipend = ICU_REG_READ(ICU_IPEND6);
  379         printf("ipend6 = %08x!\n", ipend);
  380 #endif
  381         while (irqstat != 0) {
  382                 if ((irqstat & 1) == 1) {
  383                 }
  384 
  385                 irq++;
  386                 irqstat >>= 1;
  387         }
  388 
  389         return (FILTER_HANDLED);
  390 }
  391 
  392 static void
  393 obio_hinted_child(device_t bus, const char *dname, int dunit)
  394 {
  395         device_t                child;
  396         long                    maddr;
  397         int                     msize;
  398         int                     irq;
  399         int                     result;
  400 
  401         child = BUS_ADD_CHILD(bus, 0, dname, dunit);
  402 
  403         /*
  404          * Set hard-wired resources for hinted child using
  405          * specific RIDs.
  406          */
  407         resource_long_value(dname, dunit, "maddr", &maddr);
  408         resource_int_value(dname, dunit, "msize", &msize);
  409 
  410 
  411         result = bus_set_resource(child, SYS_RES_MEMORY, 0,
  412             maddr, msize);
  413         if (result != 0)
  414                 device_printf(bus, "warning: bus_set_resource() failed\n");
  415 
  416         if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
  417                 result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
  418                 if (result != 0)
  419                         device_printf(bus,
  420                             "warning: bus_set_resource() failed\n");
  421         }
  422 }
  423 
  424 static device_t
  425 obio_add_child(device_t bus, u_int order, const char *name, int unit)
  426 {
  427         device_t                child;
  428         struct obio_ivar        *ivar;
  429 
  430         ivar = malloc(sizeof(struct obio_ivar), M_DEVBUF, M_WAITOK | M_ZERO);
  431         if (ivar == NULL) {
  432                 printf("Failed to allocate ivar\n");
  433                 return (0);
  434         }
  435         resource_list_init(&ivar->resources);
  436 
  437         child = device_add_child_ordered(bus, order, name, unit);
  438         if (child == NULL) {
  439                 printf("Can't add child %s%d ordered\n", name, unit);
  440                 return (0);
  441         }
  442 
  443         device_set_ivars(child, ivar);
  444 
  445         return (child);
  446 }
  447 
  448 /*
  449  * Helper routine for bus_generic_rl_get_resource/bus_generic_rl_set_resource
  450  * Provides pointer to resource_list for these routines
  451  */
  452 static struct resource_list *
  453 obio_get_resource_list(device_t dev, device_t child)
  454 {
  455         struct obio_ivar *ivar;
  456 
  457         ivar = device_get_ivars(child);
  458         return (&(ivar->resources));
  459 }
  460 
  461 static device_method_t obio_methods[] = {
  462         DEVMETHOD(bus_activate_resource,        obio_activate_resource),
  463         DEVMETHOD(bus_add_child,                obio_add_child),
  464         DEVMETHOD(bus_alloc_resource,           obio_alloc_resource),
  465         DEVMETHOD(bus_deactivate_resource,      obio_deactivate_resource),
  466         DEVMETHOD(bus_get_resource_list,        obio_get_resource_list),
  467         DEVMETHOD(bus_hinted_child,             obio_hinted_child),
  468         DEVMETHOD(bus_release_resource,         obio_release_resource),
  469         DEVMETHOD(bus_setup_intr,               obio_setup_intr),
  470         DEVMETHOD(bus_teardown_intr,            obio_teardown_intr),
  471         DEVMETHOD(device_attach,                obio_attach),
  472         DEVMETHOD(device_probe,                 obio_probe),
  473         DEVMETHOD(bus_get_resource,             bus_generic_rl_get_resource),
  474         DEVMETHOD(bus_set_resource,             bus_generic_rl_set_resource),
  475 
  476         {0, 0},
  477 };
  478 
  479 static driver_t obio_driver = {
  480         "obio",
  481         obio_methods,
  482         sizeof(struct obio_softc),
  483 };
  484 static devclass_t obio_devclass;
  485 
  486 DRIVER_MODULE(obio, nexus, obio_driver, obio_devclass, 0, 0);

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