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/cavium/ciu.c

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    1 /*-
    2  * Copyright (c) 2010 Juli Mallett <jmallett@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: stable/9/sys/mips/cavium/ciu.c 217214 2011-01-10 03:48:41Z jmallett $
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/9/sys/mips/cavium/ciu.c 217214 2011-01-10 03:48:41Z jmallett $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/interrupt.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/rman.h>
   39 #include <sys/malloc.h>
   40 #include <sys/smp.h>
   41 
   42 #include <machine/bus.h>
   43 #include <machine/intr_machdep.h>
   44 
   45 #include <contrib/octeon-sdk/cvmx.h>
   46 #include <contrib/octeon-sdk/cvmx-interrupt.h>
   47 
   48 /*
   49  * This bus sits between devices/buses and nexus and handles CIU interrupts
   50  * and passes everything else through.  It should really be a nexus subclass
   51  * or something, but for now this will be sufficient.
   52  */
   53 
   54 #define CIU_IRQ_HARD            (0)
   55 
   56 #define CIU_IRQ_EN0_BEGIN       CVMX_IRQ_WORKQ0
   57 #define CIU_IRQ_EN0_END         CVMX_IRQ_BOOTDMA
   58 #define CIU_IRQ_EN0_COUNT       ((CIU_IRQ_EN0_END - CIU_IRQ_EN0_BEGIN) + 1)
   59 
   60 #define CIU_IRQ_EN1_BEGIN       CVMX_IRQ_WDOG0
   61 #define CIU_IRQ_EN1_END         CVMX_IRQ_DFM
   62 #define CIU_IRQ_EN1_COUNT       ((CIU_IRQ_EN1_END - CIU_IRQ_EN1_BEGIN) + 1)
   63 
   64 struct ciu_softc {
   65         struct rman irq_rman;
   66         struct resource *ciu_irq;
   67 };
   68 
   69 static mips_intrcnt_t ciu_en0_intrcnt[CIU_IRQ_EN0_COUNT];
   70 static mips_intrcnt_t ciu_en1_intrcnt[CIU_IRQ_EN1_COUNT];
   71 
   72 static struct intr_event *ciu_en0_intr_events[CIU_IRQ_EN0_COUNT];
   73 static struct intr_event *ciu_en1_intr_events[CIU_IRQ_EN1_COUNT];
   74 
   75 static int              ciu_probe(device_t);
   76 static int              ciu_attach(device_t);
   77 static struct resource  *ciu_alloc_resource(device_t, device_t, int, int *,
   78                                             u_long, u_long, u_long, u_int);
   79 static int              ciu_setup_intr(device_t, device_t, struct resource *,
   80                                        int, driver_filter_t *, driver_intr_t *,
   81                                        void *, void **);
   82 static int              ciu_teardown_intr(device_t, device_t,
   83                                           struct resource *, void *);
   84 static int              ciu_bind_intr(device_t, device_t, struct resource *,
   85                                       int);
   86 static int              ciu_describe_intr(device_t, device_t,
   87                                           struct resource *, void *,
   88                                           const char *);
   89 static void             ciu_hinted_child(device_t, const char *, int);
   90 
   91 static void             ciu_en0_intr_mask(void *);
   92 static void             ciu_en0_intr_unmask(void *);
   93 #ifdef SMP
   94 static int              ciu_en0_intr_bind(void *, u_char);
   95 #endif
   96 
   97 static void             ciu_en1_intr_mask(void *);
   98 static void             ciu_en1_intr_unmask(void *);
   99 #ifdef SMP
  100 static int              ciu_en1_intr_bind(void *, u_char);
  101 #endif
  102 
  103 static int              ciu_intr(void *);
  104 
  105 static int
  106 ciu_probe(device_t dev)
  107 {
  108         if (device_get_unit(dev) != 0)
  109                 return (ENXIO);
  110 
  111         device_set_desc(dev, "Cavium Octeon Central Interrupt Unit");
  112         return (0);
  113 }
  114 
  115 static int
  116 ciu_attach(device_t dev)
  117 {
  118         char name[MAXCOMLEN + 1];
  119         struct ciu_softc *sc;
  120         unsigned i;
  121         int error;
  122         int rid;
  123 
  124         sc = device_get_softc(dev);
  125 
  126         rid = 0;
  127         sc->ciu_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, CIU_IRQ_HARD,
  128                                          CIU_IRQ_HARD, 1, RF_ACTIVE);
  129         if (sc->ciu_irq == NULL) {
  130                 device_printf(dev, "could not allocate irq%d\n", CIU_IRQ_HARD);
  131                 return (ENXIO);
  132         }
  133 
  134         error = bus_setup_intr(dev, sc->ciu_irq, INTR_TYPE_MISC, ciu_intr,
  135                                NULL, sc, NULL);
  136         if (error != 0) {
  137                 device_printf(dev, "bus_setup_intr failed: %d\n", error);
  138                 return (error);
  139         }
  140 
  141         sc->irq_rman.rm_type = RMAN_ARRAY;
  142         sc->irq_rman.rm_descr = "CIU IRQ";
  143         
  144         error = rman_init(&sc->irq_rman);
  145         if (error != 0)
  146                 return (error);
  147 
  148         /*
  149          * We have two contiguous IRQ regions, use a single rman.
  150          */
  151         error = rman_manage_region(&sc->irq_rman, CIU_IRQ_EN0_BEGIN,
  152                                    CIU_IRQ_EN1_END);
  153         if (error != 0)
  154                 return (error);
  155 
  156         for (i = 0; i < CIU_IRQ_EN0_COUNT; i++) {
  157                 snprintf(name, sizeof name, "int%d:", i + CIU_IRQ_EN0_BEGIN);
  158                 ciu_en0_intrcnt[i] = mips_intrcnt_create(name);
  159         }
  160 
  161         for (i = 0; i < CIU_IRQ_EN1_COUNT; i++) {
  162                 snprintf(name, sizeof name, "int%d:", i + CIU_IRQ_EN1_BEGIN);
  163                 ciu_en1_intrcnt[i] = mips_intrcnt_create(name);
  164         }
  165 
  166         bus_generic_probe(dev);
  167         bus_generic_attach(dev);
  168 
  169         return (0);
  170 }
  171 
  172 static struct resource *
  173 ciu_alloc_resource(device_t bus, device_t child, int type, int *rid,
  174                    u_long start, u_long end, u_long count, u_int flags)
  175 {
  176         struct resource *res;
  177         struct ciu_softc *sc;
  178         
  179         sc = device_get_softc(bus);
  180 
  181         switch (type) {
  182         case SYS_RES_IRQ:
  183                 break;
  184         default:
  185                 return (bus_alloc_resource(device_get_parent(bus), type, rid,
  186                                            start, end, count, flags));
  187         }
  188 
  189         /*
  190          * One interrupt at a time for now.
  191          */
  192         if (start != end)
  193                 return (NULL);
  194 
  195         res = rman_reserve_resource(&sc->irq_rman, start, end, count, flags,
  196                                     child);
  197         if (res != NULL)
  198                 return (res);
  199 
  200         return (NULL);
  201 }
  202 
  203 static int
  204 ciu_setup_intr(device_t bus, device_t child, struct resource *res, int flags,
  205                driver_filter_t *filter, driver_intr_t *intr, void *arg,
  206                void **cookiep)
  207 {
  208         struct intr_event *event, **eventp;
  209         void (*mask_func)(void *);
  210         void (*unmask_func)(void *);
  211         int (*bind_func)(void *, u_char);
  212         mips_intrcnt_t intrcnt;
  213         int error;
  214         int irq;
  215 
  216         irq = rman_get_start(res);
  217         if (irq <= CIU_IRQ_EN0_END) {
  218                 eventp = &ciu_en0_intr_events[irq - CIU_IRQ_EN0_BEGIN];
  219                 intrcnt = ciu_en0_intrcnt[irq - CIU_IRQ_EN0_BEGIN];
  220                 mask_func = ciu_en0_intr_mask;
  221                 unmask_func = ciu_en0_intr_unmask;
  222 #ifdef SMP
  223                 bind_func = ciu_en0_intr_bind;
  224 #endif
  225         } else {
  226                 eventp = &ciu_en1_intr_events[irq - CIU_IRQ_EN1_BEGIN];
  227                 intrcnt = ciu_en1_intrcnt[irq - CIU_IRQ_EN1_BEGIN];
  228                 mask_func = ciu_en1_intr_mask;
  229                 unmask_func = ciu_en1_intr_unmask;
  230 #ifdef SMP
  231                 bind_func = ciu_en1_intr_bind;
  232 #endif
  233         }
  234 #if !defined(SMP)
  235         bind_func = NULL;
  236 #endif
  237 
  238         if ((event = *eventp) == NULL) {
  239                 error = intr_event_create(eventp, (void *)(uintptr_t)irq, 0,
  240                     irq, mask_func, unmask_func, NULL, bind_func, "int%d", irq);
  241                 if (error != 0)
  242                         return (error);
  243 
  244                 event = *eventp;
  245 
  246                 unmask_func((void *)(uintptr_t)irq);
  247         }
  248 
  249         intr_event_add_handler(event, device_get_nameunit(child),
  250             filter, intr, arg, intr_priority(flags), flags, cookiep);
  251 
  252         mips_intrcnt_setname(intrcnt, event->ie_fullname);
  253 
  254         return (0);
  255 }
  256 
  257 static int
  258 ciu_teardown_intr(device_t bus, device_t child, struct resource *res,
  259                   void *cookie)
  260 {
  261         int error;
  262 
  263         error = intr_event_remove_handler(cookie);
  264         if (error != 0)
  265                 return (error);
  266 
  267         return (0);
  268 }
  269 
  270 #ifdef SMP
  271 static int
  272 ciu_bind_intr(device_t bus, device_t child, struct resource *res, int cpu)
  273 {
  274         struct intr_event *event;
  275         int irq;
  276         
  277         irq = rman_get_start(res);
  278         if (irq <= CIU_IRQ_EN0_END)
  279                 event = ciu_en0_intr_events[irq - CIU_IRQ_EN0_BEGIN];
  280         else
  281                 event = ciu_en1_intr_events[irq - CIU_IRQ_EN1_BEGIN];
  282 
  283         return (intr_event_bind(event, cpu));
  284 }
  285 #endif
  286 
  287 static int
  288 ciu_describe_intr(device_t bus, device_t child, struct resource *res,
  289                   void *cookie, const char *descr)
  290 {
  291         struct intr_event *event;
  292         mips_intrcnt_t intrcnt;
  293         int error;
  294         int irq;
  295         
  296         irq = rman_get_start(res);
  297         if (irq <= CIU_IRQ_EN0_END) {
  298                 event = ciu_en0_intr_events[irq - CIU_IRQ_EN0_BEGIN];
  299                 intrcnt = ciu_en0_intrcnt[irq - CIU_IRQ_EN0_BEGIN];
  300         } else {
  301                 event = ciu_en1_intr_events[irq - CIU_IRQ_EN1_BEGIN];
  302                 intrcnt = ciu_en1_intrcnt[irq - CIU_IRQ_EN1_BEGIN];
  303         }
  304 
  305         error = intr_event_describe_handler(event, cookie, descr);
  306         if (error != 0)
  307                 return (error);
  308 
  309         mips_intrcnt_setname(intrcnt, event->ie_fullname);
  310 
  311         return (0);
  312 }
  313 
  314 static void
  315 ciu_hinted_child(device_t bus, const char *dname, int dunit)
  316 {
  317         BUS_ADD_CHILD(bus, 0, dname, dunit);
  318 }
  319 
  320 static void
  321 ciu_en0_intr_mask(void *arg)
  322 {
  323         uint64_t mask;
  324         int irq;
  325 
  326         irq = (uintptr_t)arg;
  327         mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2));
  328         mask &= ~(1ull << (irq - CIU_IRQ_EN0_BEGIN));
  329         cvmx_write_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2), mask);
  330 }
  331 
  332 static void
  333 ciu_en0_intr_unmask(void *arg)
  334 {
  335         uint64_t mask;
  336         int irq;
  337 
  338         irq = (uintptr_t)arg;
  339         mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2));
  340         mask |= 1ull << (irq - CIU_IRQ_EN0_BEGIN);
  341         cvmx_write_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2), mask);
  342 }
  343 
  344 #ifdef SMP
  345 static int
  346 ciu_en0_intr_bind(void *arg, u_char target)
  347 {
  348         uint64_t mask;
  349         int core;
  350         int irq;
  351 
  352         irq = (uintptr_t)arg;
  353         CPU_FOREACH(core) {
  354                 mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(core*2));
  355                 if (core == target)
  356                         mask |= 1ull << (irq - CIU_IRQ_EN0_BEGIN);
  357                 else
  358                         mask &= ~(1ull << (irq - CIU_IRQ_EN0_BEGIN));
  359                 cvmx_write_csr(CVMX_CIU_INTX_EN0(core*2), mask);
  360         }
  361 
  362         return (0);
  363 }
  364 #endif
  365 
  366 static void
  367 ciu_en1_intr_mask(void *arg)
  368 {
  369         uint64_t mask;
  370         int irq;
  371 
  372         irq = (uintptr_t)arg;
  373         mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2));
  374         mask &= ~(1ull << (irq - CIU_IRQ_EN1_BEGIN));
  375         cvmx_write_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2), mask);
  376 }
  377 
  378 static void
  379 ciu_en1_intr_unmask(void *arg)
  380 {
  381         uint64_t mask;
  382         int irq;
  383 
  384         irq = (uintptr_t)arg;
  385         mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2));
  386         mask |= 1ull << (irq - CIU_IRQ_EN1_BEGIN);
  387         cvmx_write_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2), mask);
  388 }
  389 
  390 #ifdef SMP
  391 static int
  392 ciu_en1_intr_bind(void *arg, u_char target)
  393 {
  394         uint64_t mask;
  395         int core;
  396         int irq;
  397 
  398         irq = (uintptr_t)arg;
  399         CPU_FOREACH(core) {
  400                 mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(core*2));
  401                 if (core == target)
  402                         mask |= 1ull << (irq - CIU_IRQ_EN1_BEGIN);
  403                 else
  404                         mask &= ~(1ull << (irq - CIU_IRQ_EN1_BEGIN));
  405                 cvmx_write_csr(CVMX_CIU_INTX_EN1(core*2), mask);
  406         }
  407 
  408         return (0);
  409 }
  410 #endif
  411 
  412 static int
  413 ciu_intr(void *arg)
  414 {
  415         struct ciu_softc *sc;
  416         uint64_t en0_sum, en1_sum;
  417         uint64_t en0_mask, en1_mask;
  418         int irq_index;
  419         int error;
  420 
  421         sc = arg;
  422         (void)sc;
  423 
  424         en0_sum = cvmx_read_csr(CVMX_CIU_INTX_SUM0(cvmx_get_core_num()*2));
  425         en1_sum = cvmx_read_csr(CVMX_CIU_INT_SUM1);
  426 
  427         en0_mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2));
  428         en1_mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2));
  429 
  430         en0_sum &= en0_mask;
  431         en1_sum &= en1_mask;
  432 
  433         if (en0_sum == 0 && en1_sum == 0)
  434                 return (FILTER_STRAY);
  435 
  436         irq_index = 0;
  437         for (irq_index = 0; en0_sum != 0; irq_index++, en0_sum >>= 1) {
  438                 if ((en0_sum & 1) == 0)
  439                         continue;
  440 
  441                 mips_intrcnt_inc(ciu_en0_intrcnt[irq_index]);
  442 
  443                 error = intr_event_handle(ciu_en0_intr_events[irq_index], NULL);
  444                 if (error != 0)
  445                         printf("%s: stray en0 irq%d\n", __func__, irq_index);
  446         }
  447 
  448         irq_index = 0;
  449         for (irq_index = 0; en1_sum != 0; irq_index++, en1_sum >>= 1) {
  450                 if ((en1_sum & 1) == 0)
  451                         continue;
  452 
  453                 mips_intrcnt_inc(ciu_en1_intrcnt[irq_index]);
  454 
  455                 error = intr_event_handle(ciu_en1_intr_events[irq_index], NULL);
  456                 if (error != 0)
  457                         printf("%s: stray en1 irq%d\n", __func__, irq_index);
  458         }
  459 
  460         return (FILTER_HANDLED);
  461 }
  462 
  463 static device_method_t ciu_methods[] = {
  464         DEVMETHOD(device_probe,         ciu_probe),
  465         DEVMETHOD(device_attach,        ciu_attach),
  466 
  467         DEVMETHOD(bus_alloc_resource,   ciu_alloc_resource),
  468         DEVMETHOD(bus_activate_resource,bus_generic_activate_resource),
  469         DEVMETHOD(bus_setup_intr,       ciu_setup_intr),
  470         DEVMETHOD(bus_teardown_intr,    ciu_teardown_intr),
  471 #ifdef SMP
  472         DEVMETHOD(bus_bind_intr,        ciu_bind_intr),
  473 #endif
  474         DEVMETHOD(bus_describe_intr,    ciu_describe_intr),
  475 
  476         DEVMETHOD(bus_add_child,        bus_generic_add_child),
  477         DEVMETHOD(bus_hinted_child,     ciu_hinted_child),
  478 
  479         { 0, 0 }
  480 };
  481 
  482 static driver_t ciu_driver = {
  483         "ciu",
  484         ciu_methods,
  485         sizeof(struct ciu_softc),
  486 };
  487 static devclass_t ciu_devclass;
  488 DRIVER_MODULE(ciu, nexus, ciu_driver, ciu_devclass, 0, 0);

Cache object: 52f71bbeb78c9d6c8a85c43e9693bc33


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