The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2012 Robert N. M. Watson
    3  * All rights reserved.
    4  *
    5  * This software was developed by SRI International and the University of
    6  * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
    7  * ("CTSRD"), as part of the DARPA CRASH research programme.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 #include <sys/bus.h>
   36 #include <sys/condvar.h>
   37 #include <sys/conf.h>
   38 #include <sys/bio.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/module.h>
   43 #include <sys/mutex.h>
   44 #include <sys/rman.h>
   45 #include <sys/systm.h>
   46 #include <sys/taskqueue.h>
   47 
   48 #include <machine/bus.h>
   49 #include <machine/resource.h>
   50 
   51 #include <geom/geom_disk.h>
   52 
   53 #include <dev/altera/jtag_uart/altera_jtag_uart.h>
   54 
   55 /*
   56  * Nexus bus attachment for Altera JTAG UARTs.  Appropriate for most Altera
   57  * FPGA SoC-style configurations in which the IP core will be exposed to the
   58  * processor via a memory-mapped Avalon bus.
   59  */
   60 static int
   61 altera_jtag_uart_nexus_probe(device_t dev)
   62 {
   63 
   64         device_set_desc(dev, "Altera JTAG UART");
   65         return (BUS_PROBE_NOWILDCARD);
   66 }
   67 
   68 static int
   69 altera_jtag_uart_nexus_attach(device_t dev)
   70 {
   71         struct altera_jtag_uart_softc *sc;
   72         int error;
   73 
   74         error = 0;
   75         sc = device_get_softc(dev);
   76         sc->ajus_dev = dev;
   77         sc->ajus_unit = device_get_unit(dev);
   78         sc->ajus_mem_rid = 0;
   79         sc->ajus_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
   80             &sc->ajus_mem_rid, RF_ACTIVE);
   81         if (sc->ajus_mem_res == NULL) {
   82                 device_printf(dev, "couldn't map memory\n");
   83                 error = ENXIO;
   84                 goto out;
   85         }
   86 
   87         /*
   88          * Interrupt support is optional -- if we can't allocate an IRQ, then
   89          * we fall back on polling.
   90          */
   91         sc->ajus_irq_rid = 0;
   92         sc->ajus_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
   93             &sc->ajus_irq_rid, RF_ACTIVE | RF_SHAREABLE);
   94         if (sc->ajus_irq_res == NULL)
   95                 device_printf(dev,
   96                     "IRQ unavailable; selecting polled operation\n");
   97         error = altera_jtag_uart_attach(sc);
   98 out:
   99         if (error) {
  100                 if (sc->ajus_irq_res != NULL)
  101                         bus_release_resource(dev, SYS_RES_IRQ,
  102                             sc->ajus_irq_rid, sc->ajus_irq_res);
  103                 if (sc->ajus_mem_res != NULL)
  104                         bus_release_resource(dev, SYS_RES_MEMORY,
  105                             sc->ajus_mem_rid, sc->ajus_mem_res);
  106         }
  107         return (error);
  108 }
  109 
  110 static int
  111 altera_jtag_uart_nexus_detach(device_t dev)
  112 {
  113         struct altera_jtag_uart_softc *sc;
  114 
  115         sc = device_get_softc(dev);
  116         KASSERT(sc->ajus_mem_res != NULL, ("%s: resources not allocated",
  117             __func__));
  118 
  119         altera_jtag_uart_detach(sc);
  120         bus_release_resource(dev, SYS_RES_IRQ, sc->ajus_irq_rid,
  121             sc->ajus_irq_res);
  122         bus_release_resource(dev, SYS_RES_MEMORY, sc->ajus_mem_rid,
  123             sc->ajus_mem_res);
  124         return (0);
  125 }
  126 
  127 static device_method_t altera_jtag_uart_nexus_methods[] = {
  128         DEVMETHOD(device_probe,         altera_jtag_uart_nexus_probe),
  129         DEVMETHOD(device_attach,        altera_jtag_uart_nexus_attach),
  130         DEVMETHOD(device_detach,        altera_jtag_uart_nexus_detach),
  131         { 0, 0 }
  132 };
  133 
  134 static driver_t altera_jtag_uart_nexus_driver = {
  135         "altera_jtag_uart",
  136         altera_jtag_uart_nexus_methods,
  137         sizeof(struct altera_jtag_uart_softc),
  138 };
  139 
  140 DRIVER_MODULE(altera_jtag_uart, nexus, altera_jtag_uart_nexus_driver,
  141     altera_jtag_uart_devclass, 0, 0);

Cache object: bff33e8d1c899a41f4b0e303030fb948


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