intr_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright 2003-2011 Netlogic Microsystems (Netlogic). All rights
    5  * reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions are
    9  * met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in
   15  *    the documentation and/or other materials provided with the
   16  *    distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY Netlogic Microsystems ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   21  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   28  * THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * NETLOGIC_BSD */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/interrupt.h>
   39 #include <sys/kernel.h>
   40 #include <sys/module.h>
   41 
   42 #include <dev/ofw/ofw_bus.h>
   43 #include <dev/ofw/ofw_bus_subr.h>
   44 
   45 #include <machine/cpu.h>
   46 #include <machine/cpufunc.h>
   47 #include <machine/cpuinfo.h>
   48 #include <machine/cpuregs.h>
   49 #include <machine/frame.h>
   50 #include <machine/intr_machdep.h>
   51 #include <machine/md_var.h>
   52 #include <machine/trap.h>
   53 #include <machine/hwfunc.h>
   54 
   55 #include <mips/nlm/hal/haldefs.h>
   56 #include <mips/nlm/hal/iomap.h>
   57 #include <mips/nlm/hal/mips-extns.h>
   58 #include <mips/nlm/interrupt.h>
   59 #include <mips/nlm/hal/pic.h>
   60 #include <mips/nlm/xlp.h>
   61 
   62 #define INTRCNT_COUNT   256
   63 #define INTRNAME_LEN    (2*MAXCOMLEN + 1)
   64 
   65 MALLOC_DECLARE(M_MIPSINTR);
   66 MALLOC_DEFINE(M_MIPSINTR, "mipsintr", "MIPS interrupt handling");
   67 
   68 u_long *intrcnt;
   69 char *intrnames;
   70 size_t sintrcnt;
   71 size_t sintrnames;
   72 
   73 struct xlp_intrsrc {
   74         void (*bus_ack)(int, void *);   /* Additional ack */
   75         void *bus_ack_arg;              /* arg for additional ack */
   76         struct intr_event *ie;          /* event corresponding to intr */
   77         int irq;
   78         int irt;
   79 };
   80 
   81 static struct xlp_intrsrc xlp_interrupts[XLR_MAX_INTR];
   82 static mips_intrcnt_t mips_intr_counters[XLR_MAX_INTR];
   83 static int intrcnt_index;
   84 
   85 int
   86 xlp_irq_to_irt(int irq)
   87 {
   88         uint32_t offset;
   89 
   90         switch (irq) {
   91         case PIC_UART_0_IRQ:
   92         case PIC_UART_1_IRQ:
   93                 offset =  XLP_IO_UART_OFFSET(0, irq - PIC_UART_0_IRQ);
   94                 return (xlp_socdev_irt(offset));
   95         case PIC_PCIE_0_IRQ:
   96         case PIC_PCIE_1_IRQ:
   97         case PIC_PCIE_2_IRQ:
   98         case PIC_PCIE_3_IRQ:
   99                 offset = XLP_IO_PCIE_OFFSET(0, irq - PIC_PCIE_0_IRQ);
  100                 return (xlp_socdev_irt(offset));
  101         case PIC_USB_0_IRQ:
  102         case PIC_USB_1_IRQ:
  103         case PIC_USB_2_IRQ:
  104         case PIC_USB_3_IRQ:
  105         case PIC_USB_4_IRQ:
  106                 offset = XLP_IO_USB_OFFSET(0, irq - PIC_USB_0_IRQ);
  107                 return (xlp_socdev_irt(offset));
  108         case PIC_I2C_0_IRQ:
  109         case PIC_I2C_1_IRQ:
  110                 offset = XLP_IO_I2C0_OFFSET(0);
  111                 return (xlp_socdev_irt(offset) + irq - PIC_I2C_0_IRQ);
  112         default:
  113                 printf("ERROR: %s: unknown irq %d\n", __func__, irq);
  114                 return (-1);
  115         }
  116 }
  117 
  118 void
  119 xlp_enable_irq(int irq)
  120 {
  121         uint64_t eimr;
  122 
  123         eimr = nlm_read_c0_eimr();
  124         nlm_write_c0_eimr(eimr | (1ULL << irq));
  125 }
  126 
  127 void
  128 cpu_establish_softintr(const char *name, driver_filter_t * filt,
  129     void (*handler) (void *), void *arg, int irq, int flags,
  130     void **cookiep)
  131 {
  132 
  133         panic("Soft interrupts unsupported!\n");
  134 }
  135 
  136 static void
  137 xlp_post_filter(void *source)
  138 {
  139         struct xlp_intrsrc *src = source;
  140 
  141         if (src->bus_ack)
  142                 src->bus_ack(src->irq, src->bus_ack_arg);
  143         nlm_pic_ack(xlp_pic_base, src->irt);
  144 }
  145 
  146 static void
  147 xlp_pre_ithread(void *source)
  148 {
  149         struct xlp_intrsrc *src = source;
  150 
  151         if (src->bus_ack)
  152                 src->bus_ack(src->irq, src->bus_ack_arg);
  153 }
  154 
  155 static void
  156 xlp_post_ithread(void *source)
  157 {
  158         struct xlp_intrsrc *src = source;
  159 
  160         nlm_pic_ack(xlp_pic_base, src->irt);
  161 }
  162 
  163 void
  164 xlp_set_bus_ack(int irq, void (*ack)(int, void *), void *arg)
  165 {
  166         struct xlp_intrsrc *src;
  167 
  168         KASSERT(irq > 0 && irq <= XLR_MAX_INTR,
  169             ("%s called for bad hard intr %d", __func__, irq));
  170 
  171         /* no locking needed - this will called early in boot */
  172         src = &xlp_interrupts[irq];
  173         KASSERT(src->ie != NULL,
  174             ("%s called after IRQ enable for %d.", __func__, irq));
  175         src->bus_ack_arg = arg;
  176         src->bus_ack = ack;
  177 }
  178 
  179 void
  180 cpu_establish_hardintr(const char *name, driver_filter_t * filt,
  181     void (*handler) (void *), void *arg, int irq, int flags,
  182     void **cookiep)
  183 {
  184         struct intr_event *ie;  /* descriptor for the IRQ */
  185         struct xlp_intrsrc *src = NULL;
  186         int errcode;
  187 
  188         KASSERT(irq > 0 && irq <= XLR_MAX_INTR ,
  189             ("%s called for bad hard intr %d", __func__, irq));
  190 
  191         /*
  192          * Locking - not needed now, because we do this only on
  193          * startup from CPU0
  194          */
  195         src = &xlp_interrupts[irq];
  196         ie = src->ie;
  197         if (ie == NULL) {
  198                 /*
  199                  * PIC based interrupts need ack in PIC, and some SoC
  200                  * components need additional acks (e.g. PCI)
  201                  */
  202                 if (XLP_IRQ_IS_PICINTR(irq))
  203                         errcode = intr_event_create(&ie, src, 0, irq,
  204                             xlp_pre_ithread, xlp_post_ithread, xlp_post_filter,
  205                             NULL, "hard intr%d:", irq);
  206                 else {
  207                         if (filt == NULL)
  208                                 panic("Unsupported non filter percpu intr %d", irq);
  209                         errcode = intr_event_create(&ie, src, 0, irq,
  210                             NULL, NULL, NULL, NULL, "hard intr%d:", irq);
  211                 }
  212                 if (errcode) {
  213                         printf("Could not create event for intr %d\n", irq);
  214                         return;
  215                 }
  216                 src->irq = irq;
  217                 src->ie = ie;
  218         }
  219         if (XLP_IRQ_IS_PICINTR(irq)) {
  220                 /* Set all irqs to CPU 0 for now */
  221                 src->irt = xlp_irq_to_irt(irq);
  222                 nlm_pic_write_irt_direct(xlp_pic_base, src->irt, 1, 0,
  223                     PIC_LOCAL_SCHEDULING, irq, 0);
  224         }
  225 
  226         intr_event_add_handler(ie, name, filt, handler, arg,
  227             intr_priority(flags), flags, cookiep);
  228         xlp_enable_irq(irq);
  229 }
  230 
  231 void
  232 cpu_intr(struct trapframe *tf)
  233 {
  234         struct intr_event *ie;
  235         uint64_t eirr, eimr;
  236         int i;
  237 
  238         critical_enter();
  239 
  240         /* find a list of enabled interrupts */
  241         eirr = nlm_read_c0_eirr();
  242         eimr = nlm_read_c0_eimr();
  243         eirr &= eimr;
  244 
  245         if (eirr == 0) {
  246                 critical_exit();
  247                 return;
  248         }
  249         /*
  250          * No need to clear the EIRR here as the handler writes to
  251          * compare which ACKs the interrupt.
  252          */
  253         if (eirr & (1 << IRQ_TIMER)) {
  254                 intr_event_handle(xlp_interrupts[IRQ_TIMER].ie, tf);
  255                 critical_exit();
  256                 return;
  257         }
  258 
  259         /* FIXME sched pin >? LOCK>? */
  260         for (i = sizeof(eirr) * 8 - 1; i >= 0; i--) {
  261                 if ((eirr & (1ULL << i)) == 0)
  262                         continue;
  263 
  264                 ie = xlp_interrupts[i].ie;
  265                 /* Don't account special IRQs */
  266                 switch (i) {
  267                 case IRQ_IPI:
  268                 case IRQ_MSGRING:
  269                         break;
  270                 default:
  271                         mips_intrcnt_inc(mips_intr_counters[i]);
  272                 }
  273 
  274                 /* Ack the IRQ on the CPU */
  275                 nlm_write_c0_eirr(1ULL << i);
  276                 if (intr_event_handle(ie, tf) != 0) {
  277                         printf("stray interrupt %d\n", i);
  278                 }
  279         }
  280         critical_exit();
  281 }
  282 
  283 void
  284 mips_intrcnt_setname(mips_intrcnt_t counter, const char *name)
  285 {
  286         int idx = counter - intrcnt;
  287 
  288         KASSERT(counter != NULL, ("mips_intrcnt_setname: NULL counter"));
  289 
  290         snprintf(intrnames + (MAXCOMLEN + 1) * idx,
  291             MAXCOMLEN + 1, "%-*s", MAXCOMLEN, name);
  292 }
  293 
  294 mips_intrcnt_t
  295 mips_intrcnt_create(const char* name)
  296 {
  297         mips_intrcnt_t counter = &intrcnt[intrcnt_index++];
  298 
  299         mips_intrcnt_setname(counter, name);
  300         return counter;
  301 }
  302 
  303 void
  304 cpu_init_interrupts()
  305 {
  306         int i;
  307         char name[MAXCOMLEN + 1];
  308 
  309         intrcnt = mallocarray(INTRCNT_COUNT, sizeof(u_long), M_MIPSINTR,
  310             M_WAITOK | M_ZERO);
  311         intrnames = mallocarray(INTRCNT_COUNT, INTRNAME_LEN, M_MIPSINTR,
  312             M_WAITOK | M_ZERO);
  313         sintrcnt = INTRCNT_COUNT * sizeof(u_long);
  314         sintrnames = INTRCNT_COUNT * INTRNAME_LEN;
  315 
  316         /*
  317          * Initialize all available vectors so spare IRQ
  318          * would show up in systat output
  319          */
  320         for (i = 0; i < XLR_MAX_INTR; i++) {
  321                 snprintf(name, MAXCOMLEN + 1, "int%d:", i);
  322                 mips_intr_counters[i] = mips_intrcnt_create(name);
  323         }
  324 }
  325 
  326 static int      xlp_pic_probe(device_t);
  327 static int      xlp_pic_attach(device_t);
  328 
  329 static int
  330 xlp_pic_probe(device_t dev)
  331 {
  332 
  333         if (!ofw_bus_is_compatible(dev, "netlogic,xlp-pic"))
  334                 return (ENXIO);
  335         device_set_desc(dev, "XLP PIC");
  336         return (0);
  337 }
  338 
  339 static int
  340 xlp_pic_attach(device_t dev)
  341 {
  342 
  343         return (0);
  344 }
  345 
  346 static device_method_t xlp_pic_methods[] = {
  347         DEVMETHOD(device_probe,         xlp_pic_probe),
  348         DEVMETHOD(device_attach,        xlp_pic_attach),
  349 
  350         DEVMETHOD_END
  351 };
  352 
  353 static driver_t xlp_pic_driver = {
  354         "xlp_pic",
  355         xlp_pic_methods,
  356         1,              /* no softc */
  357 };
  358 
  359 static devclass_t xlp_pic_devclass;
  360 DRIVER_MODULE(xlp_pic, simplebus, xlp_pic_driver, xlp_pic_devclass, 0, 0);
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FreeBSD/Linux Kernel Cross Reference sys/mips/nlm/intr_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/mips/nlm/intr_machdep.c
