pl190.c

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    1 /*-
    2  * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@bluezbox.com>
    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("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/bus.h>
   34 #include <sys/kernel.h>
   35 #include <sys/ktr.h>
   36 #include <sys/module.h>
   37 #include <sys/rman.h>
   38 #include <machine/bus.h>
   39 #include <machine/intr.h>
   40 
   41 #include <dev/fdt/fdt_common.h>
   42 #include <dev/ofw/openfirm.h>
   43 #include <dev/ofw/ofw_bus.h>
   44 #include <dev/ofw/ofw_bus_subr.h>
   45 
   46 #ifdef  DEBUG
   47 #define dprintf(fmt, args...) printf(fmt, ##args)
   48 #else
   49 #define dprintf(fmt, args...)
   50 #endif
   51 
   52 #define VICIRQSTATUS    0x000
   53 #define VICFIQSTATUS    0x004
   54 #define VICRAWINTR      0x008
   55 #define VICINTSELECT    0x00C
   56 #define VICINTENABLE    0x010
   57 #define VICINTENCLEAR   0x014
   58 #define VICSOFTINT      0x018
   59 #define VICSOFTINTCLEAR 0x01C
   60 #define VICPROTECTION   0x020
   61 #define VICPERIPHID     0xFE0
   62 #define VICPRIMECELLID  0xFF0
   63 
   64 #define VIC_NIRQS       32
   65 
   66 struct pl190_intc_softc {
   67         device_t                sc_dev;
   68         struct resource *       intc_res;
   69 };
   70 
   71 static struct pl190_intc_softc *pl190_intc_sc = NULL;
   72 
   73 #define intc_vic_read_4(reg)            \
   74     bus_read_4(pl190_intc_sc->intc_res, (reg))
   75 #define intc_vic_write_4(reg, val)              \
   76     bus_write_4(pl190_intc_sc->intc_res, (reg), (val))
   77 
   78 static int
   79 pl190_intc_probe(device_t dev)
   80 {
   81 
   82         if (!ofw_bus_status_okay(dev))
   83                 return (ENXIO);
   84 
   85         if (!ofw_bus_is_compatible(dev, "arm,versatile-vic"))
   86                 return (ENXIO);
   87         device_set_desc(dev, "ARM PL190 VIC");
   88         return (BUS_PROBE_DEFAULT);
   89 }
   90 
   91 static int
   92 pl190_intc_attach(device_t dev)
   93 {
   94         struct          pl190_intc_softc *sc = device_get_softc(dev);
   95         uint32_t        id;
   96         int             i, rid;
   97 
   98         sc->sc_dev = dev;
   99 
  100         if (pl190_intc_sc)
  101                 return (ENXIO);
  102 
  103         /* Request memory resources */
  104         rid = 0;
  105         sc->intc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  106             RF_ACTIVE);
  107         if (sc->intc_res == NULL) {
  108                 device_printf(dev, "Error: could not allocate memory resources\n");
  109                 return (ENXIO);
  110         }
  111 
  112         pl190_intc_sc = sc;
  113         /*
  114          * All interrupts should use IRQ line
  115          */
  116         intc_vic_write_4(VICINTSELECT, 0x00000000);
  117         /* Disable all interrupts */
  118         intc_vic_write_4(VICINTENCLEAR, 0xffffffff);
  119         /* Enable INT31, SIC IRQ */
  120         intc_vic_write_4(VICINTENABLE, (1U << 31));
  121 
  122         id = 0;
  123         for (i = 3; i >= 0; i--) {
  124                 id = (id << 8) | 
  125                      (intc_vic_read_4(VICPERIPHID + i*4) & 0xff);
  126         }
  127 
  128         device_printf(dev, "Peripheral ID: %08x\n", id);
  129 
  130         id = 0;
  131         for (i = 3; i >= 0; i--) {
  132                 id = (id << 8) | 
  133                      (intc_vic_read_4(VICPRIMECELLID + i*4) & 0xff);
  134         }
  135 
  136         device_printf(dev, "PrimeCell ID: %08x\n", id);
  137 
  138         return (0);
  139 }
  140 
  141 static device_method_t pl190_intc_methods[] = {
  142         DEVMETHOD(device_probe,         pl190_intc_probe),
  143         DEVMETHOD(device_attach,        pl190_intc_attach),
  144         { 0, 0 }
  145 };
  146 
  147 static driver_t pl190_intc_driver = {
  148         "intc",
  149         pl190_intc_methods,
  150         sizeof(struct pl190_intc_softc),
  151 };
  152 
  153 static devclass_t pl190_intc_devclass;
  154 
  155 EARLY_DRIVER_MODULE(intc, simplebus, pl190_intc_driver, pl190_intc_devclass, 
  156     0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
  157 
  158 int
  159 arm_get_next_irq(int last_irq)
  160 {
  161         uint32_t pending;
  162         int32_t irq = last_irq + 1;
  163 
  164         /* Sanity check */
  165         if (irq < 0)
  166                 irq = 0;
  167         
  168         pending = intc_vic_read_4(VICIRQSTATUS);
  169         while (irq < VIC_NIRQS) {
  170                 if (pending & (1 << irq))
  171                         return (irq);
  172                 irq++;
  173         }
  174 
  175         return (-1);
  176 }
  177 
  178 void
  179 arm_mask_irq(uintptr_t nb)
  180 {
  181 
  182         dprintf("%s: %d\n", __func__, nb);
  183         intc_vic_write_4(VICINTENCLEAR, (1 << nb));
  184 }
  185 
  186 void
  187 arm_unmask_irq(uintptr_t nb)
  188 {
  189 
  190         dprintf("%s: %d\n", __func__, nb);
  191         intc_vic_write_4(VICINTENABLE, (1 << nb));
  192 }

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FreeBSD/Linux Kernel Cross Reference sys/arm/arm/pl190.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/pl190.c