FreeBSD/Linux Kernel Cross Reference
sys/arm/allwinner/aw_r_intc.c

     /*-
      * Copyright (c) 2021 Emmanuel Vadot <manu@freebsd.org>
      *
      * 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("$FreeBSD$");
    
    #include "opt_platform.h"
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <machine/intr.h>
    
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include "pic_if.h"
    
    struct aw_r_intc_gicp_softc {
            device_t                dev;
            device_t                parent;
            struct resource         *res;
    
            struct intr_map_data_fdt *parent_map_data;
    };
    
    static struct ofw_compat_data compat_data[] = {
            {"allwinner,sun6i-a31-r-intc",  1},
            {NULL,                          0}
    };
    
    static int
    aw_r_intc_gicp_probe(device_t dev)
    {
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
                    return (ENXIO);
    
            device_set_desc(dev, "Allwinner R INTC");
            return (BUS_PROBE_DEFAULT);
    }
    
    static int
    aw_r_intc_gicp_attach(device_t dev)
    {
            struct aw_r_intc_gicp_softc *sc;
            phandle_t node, xref, intr_parent;
    
            sc = device_get_softc(dev);
            sc->dev = dev;
            node = ofw_bus_get_node(dev);
    
            /* Look for our parent */
            if ((intr_parent = ofw_bus_find_iparent(node)) == 0) {
                    device_printf(dev,
                         "Cannot find our parent interrupt controller\n");
                    return (ENXIO);
            }
            if ((sc->parent = OF_device_from_xref(intr_parent)) == NULL) {
                    device_printf(dev,
                         "cannot find parent interrupt controller device\n");
                    return (ENXIO);
            }
    
            /* Register ourself as a interrupt controller */
            xref = OF_xref_from_node(node);
            if (intr_pic_register(dev, xref) == NULL) {
                    device_printf(dev, "Cannot register GICP\n");
                    return (ENXIO);
            }
    
            /* Allocate GIC compatible mapping */
           sc->parent_map_data = (struct intr_map_data_fdt *)intr_alloc_map_data(
               INTR_MAP_DATA_FDT, sizeof(struct intr_map_data_fdt) +
               + 3 * sizeof(phandle_t), M_WAITOK | M_ZERO);
   
           /* Register ourself to device can find us */
           OF_device_register_xref(xref, dev);
   
           return (0);
   }
   
   static int
   aw_r_intc_gicp_detach(device_t dev)
   {
   
           return (EBUSY);
   }
   
   static struct intr_map_data *
   aw_r_intc_gicp_convert_map_data(struct aw_r_intc_gicp_softc *sc,
       struct intr_map_data *data)
   {
           struct intr_map_data_fdt *daf;
   
           daf = (struct intr_map_data_fdt *)data;
   
           /* We only support GIC forward for now */
           if (daf->ncells != 3)
                   return (NULL);
   
           /* Check if this is a GIC_SPI type */
           if (daf->cells[0] != 0)
                   return (NULL);
   
           sc->parent_map_data->ncells = 3;
           sc->parent_map_data->cells[0] = 0;
           sc->parent_map_data->cells[1] = daf->cells[1];
           sc->parent_map_data->cells[2] = daf->cells[2];
   
           return ((struct intr_map_data *)sc->parent_map_data);
   }
   
   static int
   aw_r_intc_gicp_activate_intr(device_t dev, struct intr_irqsrc *isrc,
       struct resource *res, struct intr_map_data *data)
   {
           struct aw_r_intc_gicp_softc *sc;
   
           sc = device_get_softc(dev);
           data = aw_r_intc_gicp_convert_map_data(sc, data);
           if (data == NULL)
                   return (EINVAL);
   
           return (PIC_ACTIVATE_INTR(sc->parent, isrc, res, data));
   }
   
   static void
   aw_r_intc_gicp_enable_intr(device_t dev, struct intr_irqsrc *isrc)
   {
           struct aw_r_intc_gicp_softc *sc;
   
           sc = device_get_softc(dev);
   
           PIC_ENABLE_INTR(sc->parent, isrc);
   }
   
   static void
   aw_r_intc_gicp_disable_intr(device_t dev, struct intr_irqsrc *isrc)
   {
           struct aw_r_intc_gicp_softc *sc;
   
           sc = device_get_softc(dev);
   
           PIC_DISABLE_INTR(sc->parent, isrc);
   }
   
   static int
   aw_r_intc_gicp_map_intr(device_t dev, struct intr_map_data *data,
       struct intr_irqsrc **isrcp)
   {
           struct aw_r_intc_gicp_softc *sc;
           int ret;
   
           sc = device_get_softc(dev);
   
           if (data->type != INTR_MAP_DATA_FDT)
                   return (ENOTSUP);
   
           data = aw_r_intc_gicp_convert_map_data(sc, data);
           if (data == NULL)
                   return (EINVAL);
   
           ret = PIC_MAP_INTR(sc->parent, data, isrcp);
           (*isrcp)->isrc_dev = sc->dev;
           return(ret);
   }
   
   static int
   aw_r_intc_gicp_deactivate_intr(device_t dev, struct intr_irqsrc *isrc,
       struct resource *res, struct intr_map_data *data)
   {
           struct aw_r_intc_gicp_softc *sc;
   
           sc = device_get_softc(dev);
   
           data = aw_r_intc_gicp_convert_map_data(sc, data);
           if (data == NULL)
                   return (EINVAL);
   
           return (PIC_DEACTIVATE_INTR(sc->parent, isrc, res, data));
   }
   
   static int
   aw_r_intc_gicp_setup_intr(device_t dev, struct intr_irqsrc *isrc,
       struct resource *res, struct intr_map_data *data)
   {
           struct aw_r_intc_gicp_softc *sc;
   
           sc = device_get_softc(dev);
           data = aw_r_intc_gicp_convert_map_data(sc, data);
           if (data == NULL)
                   return (EINVAL);
   
           return (PIC_SETUP_INTR(sc->parent, isrc, res, data));
   }
   
   static int
   aw_r_intc_gicp_teardown_intr(device_t dev, struct intr_irqsrc *isrc,
       struct resource *res, struct intr_map_data *data)
   {
           struct aw_r_intc_gicp_softc *sc;
   
           sc = device_get_softc(dev);
           data = aw_r_intc_gicp_convert_map_data(sc, data);
           if (data == NULL)
                   return (EINVAL);
   
           return (PIC_TEARDOWN_INTR(sc->parent, isrc, res, data));
   }
   
   static void
   aw_r_intc_gicp_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
   {
           struct aw_r_intc_gicp_softc *sc;
   
           sc = device_get_softc(dev);
   
           PIC_PRE_ITHREAD(sc->parent, isrc);
   }
   
   static void
   aw_r_intc_gicp_post_ithread(device_t dev, struct intr_irqsrc *isrc)
   {
           struct aw_r_intc_gicp_softc *sc;
   
           sc = device_get_softc(dev);
   
           PIC_POST_ITHREAD(sc->parent, isrc);
   }
   
   static void
   aw_r_intc_gicp_post_filter(device_t dev, struct intr_irqsrc *isrc)
   {
           struct aw_r_intc_gicp_softc *sc;
   
           sc = device_get_softc(dev);
   
           PIC_POST_FILTER(sc->parent, isrc);
   }
   
   static device_method_t aw_r_intc_gicp_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         aw_r_intc_gicp_probe),
           DEVMETHOD(device_attach,        aw_r_intc_gicp_attach),
           DEVMETHOD(device_detach,        aw_r_intc_gicp_detach),
   
           /* Interrupt controller interface */
           DEVMETHOD(pic_activate_intr,    aw_r_intc_gicp_activate_intr),
           DEVMETHOD(pic_disable_intr,     aw_r_intc_gicp_disable_intr),
           DEVMETHOD(pic_enable_intr,      aw_r_intc_gicp_enable_intr),
           DEVMETHOD(pic_map_intr,         aw_r_intc_gicp_map_intr),
           DEVMETHOD(pic_deactivate_intr,  aw_r_intc_gicp_deactivate_intr),
           DEVMETHOD(pic_setup_intr,       aw_r_intc_gicp_setup_intr),
           DEVMETHOD(pic_teardown_intr,    aw_r_intc_gicp_teardown_intr),
           DEVMETHOD(pic_post_filter,      aw_r_intc_gicp_post_filter),
           DEVMETHOD(pic_post_ithread,     aw_r_intc_gicp_post_ithread),
           DEVMETHOD(pic_pre_ithread,      aw_r_intc_gicp_pre_ithread),
   
           DEVMETHOD_END
   };
   
   static devclass_t aw_r_intc_gicp_devclass;
   
   static driver_t aw_r_intc_gicp_driver = {
           "aw_r_intc_gicp",
           aw_r_intc_gicp_methods,
           sizeof(struct aw_r_intc_gicp_softc),
   };
   
   EARLY_DRIVER_MODULE(aw_r_intc_gicp, simplebus, aw_r_intc_gicp_driver,
       aw_r_intc_gicp_devclass, 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);

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