FreeBSD/Linux Kernel Cross Reference
sys/dev/altera/jtag_uart/altera_jtag_uart_fdt.c

     /*-
      * Copyright (c) 2012 Robert N. M. Watson
      * All rights reserved.
      *
      * This software was developed by SRI International and the University of
      * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
      * ("CTSRD"), as part of the DARPA CRASH research programme.
      *
      * 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/dev/altera/jtag_uart/altera_jtag_uart_fdt.c 245380 2013-01-13 16:57:11Z rwatson $");
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/condvar.h>
    #include <sys/conf.h>
    #include <sys/bio.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/mutex.h>
    #include <sys/rman.h>
    #include <sys/systm.h>
    #include <sys/taskqueue.h>
    
    #include <machine/bus.h>
    #include <machine/resource.h>
    
    #include <geom/geom_disk.h>
    
    #include <dev/altera/jtag_uart/altera_jtag_uart.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>
    
    /*
     * FDT bus attachment for Altera JTAG UARTs.
     */
    static int
    altera_jtag_uart_fdt_probe(device_t dev)
    {
    
            if (ofw_bus_is_compatible(dev, "altera,jtag_uart-11_0")) {
                    device_set_desc(dev, "Altera JTAG UART");
                    return (BUS_PROBE_DEFAULT);
            }
            return (ENXIO);
    }
    
    static int
    altera_jtag_uart_fdt_attach(device_t dev)
    {
            struct altera_jtag_uart_softc *sc;
            int error;
    
            error = 0;
            sc = device_get_softc(dev);
            sc->ajus_dev = dev;
            sc->ajus_unit = device_get_unit(dev);
            sc->ajus_mem_rid = 0;
            sc->ajus_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
                &sc->ajus_mem_rid, RF_ACTIVE);
            if (sc->ajus_mem_res == NULL) {
                    device_printf(dev, "couldn't map memory\n");
                    error = ENXIO;
                    goto out;
            }
    
            /*
             * Interrupt support is optional -- if we can't allocate an IRQ, then
             * we fall back on polling.
             */
            sc->ajus_irq_rid = 0;
            sc->ajus_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
                &sc->ajus_irq_rid, RF_ACTIVE | RF_SHAREABLE);
           if (sc->ajus_irq_res == NULL)
                   device_printf(dev,
                       "IRQ unavailable; selecting polled operation\n");
           error = altera_jtag_uart_attach(sc);
   out:
           if (error) {
                   if (sc->ajus_irq_res != NULL)
                           bus_release_resource(dev, SYS_RES_IRQ,
                               sc->ajus_irq_rid, sc->ajus_irq_res);
                   if (sc->ajus_mem_res != NULL)
                           bus_release_resource(dev, SYS_RES_MEMORY,
                               sc->ajus_mem_rid, sc->ajus_mem_res);
           }
           return (error);
   }
   
   static int
   altera_jtag_uart_fdt_detach(device_t dev)
   {
           struct altera_jtag_uart_softc *sc;
   
           sc = device_get_softc(dev);
           KASSERT(sc->ajus_mem_res != NULL, ("%s: resources not allocated",
               __func__));
   
           altera_jtag_uart_detach(sc);
           bus_release_resource(dev, SYS_RES_IRQ, sc->ajus_irq_rid,
               sc->ajus_irq_res);
           bus_release_resource(dev, SYS_RES_MEMORY, sc->ajus_mem_rid,
               sc->ajus_mem_res);
           return (0);
   }
   
   static device_method_t altera_jtag_uart_fdt_methods[] = {
           DEVMETHOD(device_probe,         altera_jtag_uart_fdt_probe),
           DEVMETHOD(device_attach,        altera_jtag_uart_fdt_attach),
           DEVMETHOD(device_detach,        altera_jtag_uart_fdt_detach),
           { 0, 0 }
   };
   
   static driver_t altera_jtag_uart_fdt_driver = {
           "altera_jtag_uart",
           altera_jtag_uart_fdt_methods,
           sizeof(struct altera_jtag_uart_softc),
   };
   
   DRIVER_MODULE(altera_jtag_uart, simplebus, altera_jtag_uart_fdt_driver,
       altera_jtag_uart_devclass, 0, 0);

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