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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010 Juli Mallett <jmallett@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/12/sys/mips/cavium/ciu.c 326259 2017-11-27 15:07:26Z pfg $
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: stable/12/sys/mips/cavium/ciu.c 326259 2017-11-27 15:07:26Z pfg $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 #include <sys/interrupt.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/rman.h>
   41 #include <sys/malloc.h>
   42 #include <sys/smp.h>
   43 
   44 #include <machine/bus.h>
   45 #include <machine/intr_machdep.h>
   46 
   47 #include <contrib/octeon-sdk/cvmx.h>
   48 #include <mips/cavium/octeon_irq.h>
   49 
   50 /*
   51  * This bus sits between devices/buses and nexus and handles CIU interrupts
   52  * and passes everything else through.  It should really be a nexus subclass
   53  * or something, but for now this will be sufficient.
   54  */
   55 
   56 #define CIU_IRQ_HARD            (0)
   57 
   58 #define CIU_IRQ_EN0_BEGIN       OCTEON_IRQ_WORKQ0
   59 #define CIU_IRQ_EN0_END         OCTEON_IRQ_BOOTDMA
   60 #define CIU_IRQ_EN0_COUNT       ((CIU_IRQ_EN0_END - CIU_IRQ_EN0_BEGIN) + 1)
   61 
   62 #define CIU_IRQ_EN1_BEGIN       OCTEON_IRQ_WDOG0
   63 #define CIU_IRQ_EN1_END         OCTEON_IRQ_DFM
   64 #define CIU_IRQ_EN1_COUNT       ((CIU_IRQ_EN1_END - CIU_IRQ_EN1_BEGIN) + 1)
   65 
   66 struct ciu_softc {
   67         struct rman irq_rman;
   68         struct resource *ciu_irq;
   69 };
   70 
   71 static mips_intrcnt_t ciu_en0_intrcnt[CIU_IRQ_EN0_COUNT];
   72 static mips_intrcnt_t ciu_en1_intrcnt[CIU_IRQ_EN1_COUNT];
   73 
   74 static struct intr_event *ciu_en0_intr_events[CIU_IRQ_EN0_COUNT];
   75 static struct intr_event *ciu_en1_intr_events[CIU_IRQ_EN1_COUNT];
   76 
   77 static int              ciu_probe(device_t);
   78 static int              ciu_attach(device_t);
   79 static struct resource  *ciu_alloc_resource(device_t, device_t, int, int *,
   80                                             rman_res_t, rman_res_t, rman_res_t,
   81                                             u_int);
   82 static int              ciu_setup_intr(device_t, device_t, struct resource *,
   83                                        int, driver_filter_t *, driver_intr_t *,
   84                                        void *, void **);
   85 static int              ciu_teardown_intr(device_t, device_t,
   86                                           struct resource *, void *);
   87 static int              ciu_bind_intr(device_t, device_t, struct resource *,
   88                                       int);
   89 static int              ciu_describe_intr(device_t, device_t,
   90                                           struct resource *, void *,
   91                                           const char *);
   92 static void             ciu_hinted_child(device_t, const char *, int);
   93 
   94 static void             ciu_en0_intr_mask(void *);
   95 static void             ciu_en0_intr_unmask(void *);
   96 #ifdef SMP
   97 static int              ciu_en0_intr_bind(void *, int);
   98 #endif
   99 
  100 static void             ciu_en1_intr_mask(void *);
  101 static void             ciu_en1_intr_unmask(void *);
  102 #ifdef SMP
  103 static int              ciu_en1_intr_bind(void *, int);
  104 #endif
  105 
  106 static int              ciu_intr(void *);
  107 
  108 static int
  109 ciu_probe(device_t dev)
  110 {
  111         if (device_get_unit(dev) != 0)
  112                 return (ENXIO);
  113 
  114         device_set_desc(dev, "Cavium Octeon Central Interrupt Unit");
  115         return (BUS_PROBE_NOWILDCARD);
  116 }
  117 
  118 static int
  119 ciu_attach(device_t dev)
  120 {
  121         char name[MAXCOMLEN + 1];
  122         struct ciu_softc *sc;
  123         unsigned i;
  124         int error;
  125         int rid;
  126 
  127         sc = device_get_softc(dev);
  128 
  129         rid = 0;
  130         sc->ciu_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, CIU_IRQ_HARD,
  131                                          CIU_IRQ_HARD, 1, RF_ACTIVE);
  132         if (sc->ciu_irq == NULL) {
  133                 device_printf(dev, "could not allocate irq%d\n", CIU_IRQ_HARD);
  134                 return (ENXIO);
  135         }
  136 
  137         error = bus_setup_intr(dev, sc->ciu_irq, INTR_TYPE_MISC, ciu_intr,
  138                                NULL, sc, NULL);
  139         if (error != 0) {
  140                 device_printf(dev, "bus_setup_intr failed: %d\n", error);
  141                 return (error);
  142         }
  143 
  144         sc->irq_rman.rm_type = RMAN_ARRAY;
  145         sc->irq_rman.rm_descr = "CIU IRQ";
  146         
  147         error = rman_init(&sc->irq_rman);
  148         if (error != 0)
  149                 return (error);
  150 
  151         /*
  152          * We have two contiguous IRQ regions, use a single rman.
  153          */
  154         error = rman_manage_region(&sc->irq_rman, CIU_IRQ_EN0_BEGIN,
  155                                    CIU_IRQ_EN1_END);
  156         if (error != 0)
  157                 return (error);
  158 
  159         for (i = 0; i < CIU_IRQ_EN0_COUNT; i++) {
  160                 snprintf(name, sizeof name, "int%d:", i + CIU_IRQ_EN0_BEGIN);
  161                 ciu_en0_intrcnt[i] = mips_intrcnt_create(name);
  162         }
  163 
  164         for (i = 0; i < CIU_IRQ_EN1_COUNT; i++) {
  165                 snprintf(name, sizeof name, "int%d:", i + CIU_IRQ_EN1_BEGIN);
  166                 ciu_en1_intrcnt[i] = mips_intrcnt_create(name);
  167         }
  168 
  169         bus_generic_probe(dev);
  170         bus_generic_attach(dev);
  171 
  172         return (0);
  173 }
  174 
  175 static struct resource *
  176 ciu_alloc_resource(device_t bus, device_t child, int type, int *rid,
  177                    rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
  178 {
  179         struct resource *res;
  180         struct ciu_softc *sc;
  181         
  182         sc = device_get_softc(bus);
  183 
  184         switch (type) {
  185         case SYS_RES_IRQ:
  186                 break;
  187         default:
  188                 return (bus_alloc_resource(device_get_parent(bus), type, rid,
  189                                            start, end, count, flags));
  190         }
  191 
  192         /*
  193          * One interrupt at a time for now.
  194          */
  195         if (start != end)
  196                 return (NULL);
  197 
  198         res = rman_reserve_resource(&sc->irq_rman, start, end, count, flags,
  199                                     child);
  200         if (res != NULL)
  201                 return (res);
  202 
  203         return (NULL);
  204 }
  205 
  206 static int
  207 ciu_setup_intr(device_t bus, device_t child, struct resource *res, int flags,
  208                driver_filter_t *filter, driver_intr_t *intr, void *arg,
  209                void **cookiep)
  210 {
  211         struct intr_event *event, **eventp;
  212         void (*mask_func)(void *);
  213         void (*unmask_func)(void *);
  214         int (*bind_func)(void *, int);
  215         mips_intrcnt_t intrcnt;
  216         int error;
  217         int irq;
  218 
  219         irq = rman_get_start(res);
  220         if (irq <= CIU_IRQ_EN0_END) {
  221                 eventp = &ciu_en0_intr_events[irq - CIU_IRQ_EN0_BEGIN];
  222                 intrcnt = ciu_en0_intrcnt[irq - CIU_IRQ_EN0_BEGIN];
  223                 mask_func = ciu_en0_intr_mask;
  224                 unmask_func = ciu_en0_intr_unmask;
  225 #ifdef SMP
  226                 bind_func = ciu_en0_intr_bind;
  227 #endif
  228         } else {
  229                 eventp = &ciu_en1_intr_events[irq - CIU_IRQ_EN1_BEGIN];
  230                 intrcnt = ciu_en1_intrcnt[irq - CIU_IRQ_EN1_BEGIN];
  231                 mask_func = ciu_en1_intr_mask;
  232                 unmask_func = ciu_en1_intr_unmask;
  233 #ifdef SMP
  234                 bind_func = ciu_en1_intr_bind;
  235 #endif
  236         }
  237 #if !defined(SMP)
  238         bind_func = NULL;
  239 #endif
  240 
  241         if ((event = *eventp) == NULL) {
  242                 error = intr_event_create(eventp, (void *)(uintptr_t)irq, 0,
  243                     irq, mask_func, unmask_func, NULL, bind_func, "int%d", irq);
  244                 if (error != 0)
  245                         return (error);
  246 
  247                 event = *eventp;
  248 
  249                 unmask_func((void *)(uintptr_t)irq);
  250         }
  251 
  252         intr_event_add_handler(event, device_get_nameunit(child),
  253             filter, intr, arg, intr_priority(flags), flags, cookiep);
  254 
  255         mips_intrcnt_setname(intrcnt, event->ie_fullname);
  256 
  257         return (0);
  258 }
  259 
  260 static int
  261 ciu_teardown_intr(device_t bus, device_t child, struct resource *res,
  262                   void *cookie)
  263 {
  264         int error;
  265 
  266         error = intr_event_remove_handler(cookie);
  267         if (error != 0)
  268                 return (error);
  269 
  270         return (0);
  271 }
  272 
  273 #ifdef SMP
  274 static int
  275 ciu_bind_intr(device_t bus, device_t child, struct resource *res, int cpu)
  276 {
  277         struct intr_event *event;
  278         int irq;
  279         
  280         irq = rman_get_start(res);
  281         if (irq <= CIU_IRQ_EN0_END)
  282                 event = ciu_en0_intr_events[irq - CIU_IRQ_EN0_BEGIN];
  283         else
  284                 event = ciu_en1_intr_events[irq - CIU_IRQ_EN1_BEGIN];
  285 
  286         return (intr_event_bind(event, cpu));
  287 }
  288 #endif
  289 
  290 static int
  291 ciu_describe_intr(device_t bus, device_t child, struct resource *res,
  292                   void *cookie, const char *descr)
  293 {
  294         struct intr_event *event;
  295         mips_intrcnt_t intrcnt;
  296         int error;
  297         int irq;
  298         
  299         irq = rman_get_start(res);
  300         if (irq <= CIU_IRQ_EN0_END) {
  301                 event = ciu_en0_intr_events[irq - CIU_IRQ_EN0_BEGIN];
  302                 intrcnt = ciu_en0_intrcnt[irq - CIU_IRQ_EN0_BEGIN];
  303         } else {
  304                 event = ciu_en1_intr_events[irq - CIU_IRQ_EN1_BEGIN];
  305                 intrcnt = ciu_en1_intrcnt[irq - CIU_IRQ_EN1_BEGIN];
  306         }
  307 
  308         error = intr_event_describe_handler(event, cookie, descr);
  309         if (error != 0)
  310                 return (error);
  311 
  312         mips_intrcnt_setname(intrcnt, event->ie_fullname);
  313 
  314         return (0);
  315 }
  316 
  317 static void
  318 ciu_hinted_child(device_t bus, const char *dname, int dunit)
  319 {
  320         BUS_ADD_CHILD(bus, 0, dname, dunit);
  321 }
  322 
  323 static void
  324 ciu_en0_intr_mask(void *arg)
  325 {
  326         uint64_t mask;
  327         int irq;
  328 
  329         irq = (uintptr_t)arg;
  330         mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2));
  331         mask &= ~(1ull << (irq - CIU_IRQ_EN0_BEGIN));
  332         cvmx_write_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2), mask);
  333 }
  334 
  335 static void
  336 ciu_en0_intr_unmask(void *arg)
  337 {
  338         uint64_t mask;
  339         int irq;
  340 
  341         irq = (uintptr_t)arg;
  342         mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2));
  343         mask |= 1ull << (irq - CIU_IRQ_EN0_BEGIN);
  344         cvmx_write_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2), mask);
  345 }
  346 
  347 #ifdef SMP
  348 static int
  349 ciu_en0_intr_bind(void *arg, int target)
  350 {
  351         uint64_t mask;
  352         int core;
  353         int irq;
  354 
  355         irq = (uintptr_t)arg;
  356         CPU_FOREACH(core) {
  357                 mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(core*2));
  358                 if (core == target)
  359                         mask |= 1ull << (irq - CIU_IRQ_EN0_BEGIN);
  360                 else
  361                         mask &= ~(1ull << (irq - CIU_IRQ_EN0_BEGIN));
  362                 cvmx_write_csr(CVMX_CIU_INTX_EN0(core*2), mask);
  363         }
  364 
  365         return (0);
  366 }
  367 #endif
  368 
  369 static void
  370 ciu_en1_intr_mask(void *arg)
  371 {
  372         uint64_t mask;
  373         int irq;
  374 
  375         irq = (uintptr_t)arg;
  376         mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2));
  377         mask &= ~(1ull << (irq - CIU_IRQ_EN1_BEGIN));
  378         cvmx_write_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2), mask);
  379 }
  380 
  381 static void
  382 ciu_en1_intr_unmask(void *arg)
  383 {
  384         uint64_t mask;
  385         int irq;
  386 
  387         irq = (uintptr_t)arg;
  388         mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2));
  389         mask |= 1ull << (irq - CIU_IRQ_EN1_BEGIN);
  390         cvmx_write_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2), mask);
  391 }
  392 
  393 #ifdef SMP
  394 static int
  395 ciu_en1_intr_bind(void *arg, int target)
  396 {
  397         uint64_t mask;
  398         int core;
  399         int irq;
  400 
  401         irq = (uintptr_t)arg;
  402         CPU_FOREACH(core) {
  403                 mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(core*2));
  404                 if (core == target)
  405                         mask |= 1ull << (irq - CIU_IRQ_EN1_BEGIN);
  406                 else
  407                         mask &= ~(1ull << (irq - CIU_IRQ_EN1_BEGIN));
  408                 cvmx_write_csr(CVMX_CIU_INTX_EN1(core*2), mask);
  409         }
  410 
  411         return (0);
  412 }
  413 #endif
  414 
  415 static int
  416 ciu_intr(void *arg)
  417 {
  418         struct ciu_softc *sc;
  419         uint64_t en0_sum, en1_sum;
  420         uint64_t en0_mask, en1_mask;
  421         int irq_index;
  422         int error;
  423 
  424         sc = arg;
  425         (void)sc;
  426 
  427         en0_sum = cvmx_read_csr(CVMX_CIU_INTX_SUM0(cvmx_get_core_num()*2));
  428         en1_sum = cvmx_read_csr(CVMX_CIU_INT_SUM1);
  429 
  430         en0_mask = cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num()*2));
  431         en1_mask = cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num()*2));
  432 
  433         en0_sum &= en0_mask;
  434         en1_sum &= en1_mask;
  435 
  436         if (en0_sum == 0 && en1_sum == 0)
  437                 return (FILTER_STRAY);
  438 
  439         for (irq_index = 0; en0_sum != 0; irq_index++, en0_sum >>= 1) {
  440                 if ((en0_sum & 1) == 0)
  441                         continue;
  442 
  443                 mips_intrcnt_inc(ciu_en0_intrcnt[irq_index]);
  444 
  445                 error = intr_event_handle(ciu_en0_intr_events[irq_index], NULL);
  446                 if (error != 0)
  447                         printf("%s: stray en0 irq%d\n", __func__, irq_index);
  448         }
  449 
  450         for (irq_index = 0; en1_sum != 0; irq_index++, en1_sum >>= 1) {
  451                 if ((en1_sum & 1) == 0)
  452                         continue;
  453 
  454                 mips_intrcnt_inc(ciu_en1_intrcnt[irq_index]);
  455 
  456                 error = intr_event_handle(ciu_en1_intr_events[irq_index], NULL);
  457                 if (error != 0)
  458                         printf("%s: stray en1 irq%d\n", __func__, irq_index);
  459         }
  460 
  461         return (FILTER_HANDLED);
  462 }
  463 
  464 static device_method_t ciu_methods[] = {
  465         DEVMETHOD(device_probe,         ciu_probe),
  466         DEVMETHOD(device_attach,        ciu_attach),
  467 
  468         DEVMETHOD(bus_alloc_resource,   ciu_alloc_resource),
  469         DEVMETHOD(bus_activate_resource,bus_generic_activate_resource),
  470         DEVMETHOD(bus_setup_intr,       ciu_setup_intr),
  471         DEVMETHOD(bus_teardown_intr,    ciu_teardown_intr),
  472 #ifdef SMP
  473         DEVMETHOD(bus_bind_intr,        ciu_bind_intr),
  474 #endif
  475         DEVMETHOD(bus_describe_intr,    ciu_describe_intr),
  476 
  477         DEVMETHOD(bus_add_child,        bus_generic_add_child),
  478         DEVMETHOD(bus_hinted_child,     ciu_hinted_child),
  479 
  480         { 0, 0 }
  481 };
  482 
  483 static driver_t ciu_driver = {
  484         "ciu",
  485         ciu_methods,
  486         sizeof(struct ciu_softc),
  487 };
  488 static devclass_t ciu_devclass;
  489 DRIVER_MODULE(ciu, nexus, ciu_driver, ciu_devclass, 0, 0);

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