lpc_intc.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*-
    2  * Copyright (c) 2010 Jakub Wojciech Klama <jceel@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  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/10.0/sys/arm/lpc/lpc_intc.c 239278 2012-08-15 05:37:10Z gonzo $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/bus.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/malloc.h>
   37 #include <sys/rman.h>
   38 #include <sys/timetc.h>
   39 #include <machine/bus.h>
   40 #include <machine/intr.h>
   41 
   42 #include <dev/fdt/fdt_common.h>
   43 #include <dev/ofw/openfirm.h>
   44 
   45 #include <dev/ofw/ofw_bus.h>
   46 #include <dev/ofw/ofw_bus_subr.h>
   47 
   48 #include <arm/lpc/lpcreg.h>
   49 
   50 struct lpc_intc_softc {
   51         struct resource *       li_res;
   52         bus_space_tag_t         li_bst;
   53         bus_space_handle_t      li_bsh;
   54 };
   55 
   56 static int lpc_intc_probe(device_t);
   57 static int lpc_intc_attach(device_t);
   58 static void lpc_intc_eoi(void *);
   59 
   60 static struct lpc_intc_softc *intc_softc = NULL;
   61 
   62 #define intc_read_4(reg)                \
   63     bus_space_read_4(intc_softc->li_bst, intc_softc->li_bsh, reg)
   64 #define intc_write_4(reg, val)          \
   65     bus_space_write_4(intc_softc->li_bst, intc_softc->li_bsh, reg, val)
   66 
   67 static int
   68 lpc_intc_probe(device_t dev)
   69 {
   70 
   71         if (!ofw_bus_is_compatible(dev, "lpc,pic"))
   72                 return (ENXIO);
   73 
   74         device_set_desc(dev, "LPC32x0 Interrupt Controller");
   75         return (BUS_PROBE_DEFAULT);
   76 }
   77 
   78 static int
   79 lpc_intc_attach(device_t dev)
   80 {
   81         struct lpc_intc_softc *sc = device_get_softc(dev);
   82         int rid = 0;
   83 
   84         if (intc_softc)
   85                 return (ENXIO);
   86 
   87         sc->li_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 
   88             RF_ACTIVE);
   89         if (!sc->li_res) {
   90                 device_printf(dev, "could not alloc resources\n");
   91                 return (ENXIO);
   92         }
   93 
   94         sc->li_bst = rman_get_bustag(sc->li_res);
   95         sc->li_bsh = rman_get_bushandle(sc->li_res);
   96         intc_softc = sc;
   97         arm_post_filter = lpc_intc_eoi;
   98 
   99         /* Clear interrupt status registers and disable all interrupts */
  100         intc_write_4(LPC_INTC_MIC_ER, 0);
  101         intc_write_4(LPC_INTC_SIC1_ER, 0);
  102         intc_write_4(LPC_INTC_SIC2_ER, 0);
  103         intc_write_4(LPC_INTC_MIC_RSR, ~0);
  104         intc_write_4(LPC_INTC_SIC1_RSR, ~0);
  105         intc_write_4(LPC_INTC_SIC2_RSR, ~0);
  106         return (0);
  107 }
  108 
  109 static device_method_t lpc_intc_methods[] = {
  110         DEVMETHOD(device_probe,         lpc_intc_probe),
  111         DEVMETHOD(device_attach,        lpc_intc_attach),
  112         { 0, 0 }
  113 };
  114 
  115 static driver_t lpc_intc_driver = {
  116         "pic",
  117         lpc_intc_methods,
  118         sizeof(struct lpc_intc_softc),
  119 };
  120 
  121 static devclass_t lpc_intc_devclass;
  122 
  123 DRIVER_MODULE(pic, simplebus, lpc_intc_driver, lpc_intc_devclass, 0, 0);
  124 
  125 int
  126 arm_get_next_irq(int last)
  127 {
  128         uint32_t value;
  129         int i;
  130 
  131         /* IRQs 0-31 are mapped to LPC_INTC_MIC_SR */
  132         value = intc_read_4(LPC_INTC_MIC_SR);
  133         for (i = 0; i < 32; i++) {
  134                 if (value & (1 << i))
  135                         return (i);
  136         }
  137 
  138         /* IRQs 32-63 are mapped to LPC_INTC_SIC1_SR */
  139         value = intc_read_4(LPC_INTC_SIC1_SR);
  140         for (i = 0; i < 32; i++) {
  141                 if (value & (1 << i))
  142                         return (i + 32);
  143         }
  144 
  145         /* IRQs 64-95 are mapped to LPC_INTC_SIC2_SR */
  146         value = intc_read_4(LPC_INTC_SIC2_SR);
  147         for (i = 0; i < 32; i++) {
  148                 if (value & (1 << i))
  149                         return (i + 64);
  150         }
  151 
  152         return (-1);
  153 }
  154 
  155 void
  156 arm_mask_irq(uintptr_t nb)
  157 {
  158         int reg;
  159         uint32_t value;
  160 
  161         /* Make sure that interrupt isn't active already */
  162         lpc_intc_eoi((void *)nb);
  163 
  164         if (nb > 63) {
  165                 nb -= 64;
  166                 reg = LPC_INTC_SIC2_ER;
  167         } else if (nb > 31) {
  168                 nb -= 32;
  169                 reg = LPC_INTC_SIC1_ER;
  170         } else
  171                 reg = LPC_INTC_MIC_ER;
  172 
  173         /* Clear bit in ER register */
  174         value = intc_read_4(reg);
  175         value &= ~(1 << nb);
  176         intc_write_4(reg, value);
  177 }
  178 
  179 void
  180 arm_unmask_irq(uintptr_t nb)
  181 {
  182         int reg;
  183         uint32_t value;
  184 
  185         if (nb > 63) {
  186                 nb -= 64;
  187                 reg = LPC_INTC_SIC2_ER;
  188         } else if (nb > 31) {
  189                 nb -= 32;
  190                 reg = LPC_INTC_SIC1_ER;
  191         } else
  192                 reg = LPC_INTC_MIC_ER;
  193 
  194         /* Set bit in ER register */
  195         value = intc_read_4(reg);
  196         value |= (1 << nb);
  197         intc_write_4(reg, value);
  198 }
  199 
  200 static void
  201 lpc_intc_eoi(void *data)
  202 {
  203         int reg;
  204         int nb = (int)data;
  205         uint32_t value;
  206 
  207         if (nb > 63) {
  208                 nb -= 64;
  209                 reg = LPC_INTC_SIC2_RSR;
  210         } else if (nb > 31) {
  211                 nb -= 32;
  212                 reg = LPC_INTC_SIC1_RSR;
  213         } else
  214                 reg = LPC_INTC_MIC_RSR;
  215 
  216         /* Set bit in RSR register */
  217         value = intc_read_4(reg);
  218         value |= (1 << nb);
  219         intc_write_4(reg, value);
  220 
  221 }
  222 
  223 struct fdt_fixup_entry fdt_fixup_table[] = {
  224         { NULL, NULL }
  225 };
  226 
  227 static int
  228 fdt_pic_decode_ic(phandle_t node, pcell_t *intr, int *interrupt, int *trig,
  229     int *pol)
  230 {
  231         if (!fdt_is_compatible(node, "lpc,pic"))
  232                 return (ENXIO);
  233 
  234         *interrupt = fdt32_to_cpu(intr[0]);
  235         *trig = INTR_TRIGGER_CONFORM;
  236         *pol = INTR_POLARITY_CONFORM;
  237         return (0);
  238 }
  239 
  240 fdt_pic_decode_t fdt_pic_table[] = {
  241         &fdt_pic_decode_ic,
  242         NULL
  243 };

Cache object: 896dee577319e07930a08cbbf9ab0f4a

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/arm/lpc/lpc_intc.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/lpc/lpc_intc.c