FreeBSD/Linux Kernel Cross Reference
sys/arm/at91/at91_aic.c

     /*-
      * Copyright (c) 2014 Warner Losh.  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 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 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 "opt_platform.h"
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/resource.h>
    #include <sys/systm.h>
    #include <sys/rman.h>
    
    #include <machine/armreg.h>
    #include <machine/bus.h>
    #include <machine/cpu.h>
    #include <machine/cpufunc.h>
    #include <machine/frame.h>
    #include <machine/intr.h>
    #include <machine/resource.h>
    
    #include <arm/at91/at91var.h>
    #include <arm/at91/at91_aicreg.h>
    
    #ifdef FDT
    #include <dev/fdt/fdt_common.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    #endif
    
    static struct aic_softc {
            struct resource *mem_res;       /* Memory resource */
            void            *intrhand;      /* Interrupt handle */
            device_t        sc_dev;
    } *sc;
    
    static inline uint32_t
    RD4(struct aic_softc *sc, bus_size_t off)
    {
    
            return (bus_read_4(sc->mem_res, off));
    }
    
    static inline void
    WR4(struct aic_softc *sc, bus_size_t off, uint32_t val)
    {
    
            bus_write_4(sc->mem_res, off, val);
    }
    
    void
    arm_mask_irq(uintptr_t nb)
    {
    
            WR4(sc, IC_IDCR, 1 << nb);
    }
    
    int
    arm_get_next_irq(int last __unused)
    {
            int status;
            int irq;
            
            irq = RD4(sc, IC_IVR);
            status = RD4(sc, IC_ISR);
            if (status == 0) {
                    WR4(sc, IC_EOICR, 1);
                    return (-1);
            }
            return (irq);
    }
    
    void
    arm_unmask_irq(uintptr_t nb)
   {
           
           WR4(sc, IC_IECR, 1 << nb);
           WR4(sc, IC_EOICR, 0);
   }
   
   static int
   at91_aic_probe(device_t dev)
   {
   #ifdef FDT
           if (!ofw_bus_is_compatible(dev, "atmel,at91rm9200-aic"))
                   return (ENXIO);
   #endif
           device_set_desc(dev, "AIC");
           return (0);
   }
   
   static int
   at91_aic_attach(device_t dev)
   {
           int i, rid, err = 0;
   
           device_printf(dev, "Attach %d\n", bus_current_pass);
   
           sc = device_get_softc(dev);
           sc->sc_dev = dev;
   
           rid = 0;
           sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
               RF_ACTIVE);
   
           if (sc->mem_res == NULL)
                   panic("couldn't allocate register resources");
   
           /*
            * Setup the interrupt table.
            */
           if (soc_info.soc_data == NULL || soc_info.soc_data->soc_irq_prio == NULL)
                   panic("Interrupt priority table missing\n");
           for (i = 0; i < 32; i++) {
                   WR4(sc, IC_SVR + i * 4, i);
                   /* Priority. */
                   WR4(sc, IC_SMR + i * 4, soc_info.soc_data->soc_irq_prio[i]);
                   if (i < 8)
                           WR4(sc, IC_EOICR, 1);
           }
   
           WR4(sc, IC_SPU, 32);
           /* No debug. */
           WR4(sc, IC_DCR, 0);
           /* Disable and clear all interrupts. */
           WR4(sc, IC_IDCR, 0xffffffff);
           WR4(sc, IC_ICCR, 0xffffffff);
           enable_interrupts(PSR_I | PSR_F);
   
           return (err);
   }
   
   static void
   at91_aic_new_pass(device_t dev)
   {
           device_printf(dev, "Pass %d\n", bus_current_pass);
   }
   
   static device_method_t at91_aic_methods[] = {
           DEVMETHOD(device_probe, at91_aic_probe),
           DEVMETHOD(device_attach, at91_aic_attach),
           DEVMETHOD(bus_new_pass, at91_aic_new_pass),
           DEVMETHOD_END
   };
   
   static driver_t at91_aic_driver = {
           "at91_aic",
           at91_aic_methods,
           sizeof(struct aic_softc),
   };
   
   static devclass_t at91_aic_devclass;
   
   #ifdef FDT
   DRIVER_MODULE(at91_aic, simplebus, at91_aic_driver, at91_aic_devclass, NULL,
       NULL);
   #else
   DRIVER_MODULE(at91_aic, atmelarm, at91_aic_driver, at91_aic_devclass, NULL,
       NULL);
   #endif
   /* not yet
   EARLY_DRIVER_MODULE(at91_aic, simplebus, at91_aic_driver, at91_aic_devclass,
       NULL, NULL, BUS_PASS_INTERRUPT);
   */

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