FreeBSD/Linux Kernel Cross Reference
sys/arm/versatile/versatile_sic.c

     /*-
      * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.0/sys/arm/versatile/versatile_sic.c 252393 2013-06-29 23:40:44Z gonzo $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/ktr.h>
    #include <sys/module.h>
    #include <sys/rman.h>
    #include <machine/bus.h>
    #include <machine/intr.h>
    
    #include <dev/fdt/fdt_common.h>
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #ifdef  DEBUG
    #define dprintf(fmt, args...) printf(fmt, ##args)
    #else
    #define dprintf(fmt, args...)
    #endif
    
    #define SIC_STATUS      0x00
    #define SIC_RAWSTAT     0x04
    #define SIC_ENABLE      0x08
    #define SIC_ENSET       0x08
    #define SIC_ENCLR       0x0C
    #define SIC_SOFTINTSET  0x10
    #define SIC_SOFTINTCLR  0x14
    #define SIC_PICENABLE   0x20
    #define SIC_PICENSET    0x20
    #define SIC_PICENCLR    0x24
    
    struct versatile_sic_softc {
            device_t                sc_dev;
            struct resource *       mem_res;
    };
    
    #define sic_read_4(sc, reg)                     \
        bus_read_4(sc->mem_res, (reg))
    #define sic_write_4(sc, reg, val)               \
        bus_write_4(sc->mem_res, (reg), (val))
    
    static int
    versatile_sic_probe(device_t dev)
    {
            if (!ofw_bus_is_compatible(dev, "arm,versatile-sic"))
                    return (ENXIO);
            device_set_desc(dev, "ARM Versatile SIC");
            return (BUS_PROBE_DEFAULT);
    }
    
    static int
    versatile_sic_attach(device_t dev)
    {
            struct          versatile_sic_softc *sc = device_get_softc(dev);
            uint32_t        pass_irqs;
            int             rid;
    
            sc->sc_dev = dev;
    
            /* Request memory resources */
            rid = 0;
            sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
                RF_ACTIVE);
            if (sc->mem_res == NULL) {
                    device_printf(dev, "Error: could not allocate memory resources\n");
                    return (ENXIO);
            }
    
           /* Disable all interrupts on SIC */
           sic_write_4(sc, SIC_ENCLR, 0xffffffff);
   
           /* 
            * XXX: Enable IRQ3 for KMI
            * Should be replaced by proper interrupts cascading
            */
           sic_write_4(sc, SIC_ENSET, (1 << 3));
   
           /*
            * Let PCI and Ethernet interrupts pass through
            * IRQ25, IRQ27..IRQ31
            */
           pass_irqs = (0x1f << 27) | (1 << 25);
           sic_write_4(sc, SIC_PICENSET, pass_irqs);
   
           return (0);
   }
   
   static device_method_t versatile_sic_methods[] = {
           DEVMETHOD(device_probe,         versatile_sic_probe),
           DEVMETHOD(device_attach,        versatile_sic_attach),
           { 0, 0 }
   };
   
   static driver_t versatile_sic_driver = {
           "sic",
           versatile_sic_methods,
           sizeof(struct versatile_sic_softc),
   };
   
   static devclass_t versatile_sic_devclass;
   
   DRIVER_MODULE(sic, simplebus, versatile_sic_driver, versatile_sic_devclass, 0, 0);

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