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_fdt.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 #include <dev/fdt/fdt_common.h>
   56 #include <dev/ofw/openfirm.h>
   57 #include <dev/ofw/ofw_bus.h>
   58 #include <dev/ofw/ofw_bus_subr.h>
   59 
   60 /*
   61  * FDT bus attachment for Altera JTAG UARTs.
   62  */
   63 static int
   64 altera_jtag_uart_fdt_probe(device_t dev)
   65 {
   66 
   67         if (!ofw_bus_status_okay(dev))
   68                 return (ENXIO);
   69 
   70         if (ofw_bus_is_compatible(dev, "altera,jtag_uart-11_0")) {
   71                 device_set_desc(dev, "Altera JTAG UART");
   72                 return (BUS_PROBE_DEFAULT);
   73         }
   74         return (ENXIO);
   75 }
   76 
   77 static int
   78 altera_jtag_uart_fdt_attach(device_t dev)
   79 {
   80         struct altera_jtag_uart_softc *sc;
   81         int error;
   82 
   83         error = 0;
   84         sc = device_get_softc(dev);
   85         sc->ajus_dev = dev;
   86         sc->ajus_unit = device_get_unit(dev);
   87         sc->ajus_mem_rid = 0;
   88         sc->ajus_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
   89             &sc->ajus_mem_rid, RF_ACTIVE);
   90         if (sc->ajus_mem_res == NULL) {
   91                 device_printf(dev, "couldn't map memory\n");
   92                 error = ENXIO;
   93                 goto out;
   94         }
   95 
   96         /*
   97          * Interrupt support is optional -- if we can't allocate an IRQ, then
   98          * we fall back on polling.
   99          */
  100         sc->ajus_irq_rid = 0;
  101         sc->ajus_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
  102             &sc->ajus_irq_rid, RF_ACTIVE | RF_SHAREABLE);
  103         if (sc->ajus_irq_res == NULL)
  104                 device_printf(dev,
  105                     "IRQ unavailable; selecting polled operation\n");
  106         error = altera_jtag_uart_attach(sc);
  107 out:
  108         if (error) {
  109                 if (sc->ajus_irq_res != NULL)
  110                         bus_release_resource(dev, SYS_RES_IRQ,
  111                             sc->ajus_irq_rid, sc->ajus_irq_res);
  112                 if (sc->ajus_mem_res != NULL)
  113                         bus_release_resource(dev, SYS_RES_MEMORY,
  114                             sc->ajus_mem_rid, sc->ajus_mem_res);
  115         }
  116         return (error);
  117 }
  118 
  119 static int
  120 altera_jtag_uart_fdt_detach(device_t dev)
  121 {
  122         struct altera_jtag_uart_softc *sc;
  123 
  124         sc = device_get_softc(dev);
  125         KASSERT(sc->ajus_mem_res != NULL, ("%s: resources not allocated",
  126             __func__));
  127 
  128         altera_jtag_uart_detach(sc);
  129         bus_release_resource(dev, SYS_RES_IRQ, sc->ajus_irq_rid,
  130             sc->ajus_irq_res);
  131         bus_release_resource(dev, SYS_RES_MEMORY, sc->ajus_mem_rid,
  132             sc->ajus_mem_res);
  133         return (0);
  134 }
  135 
  136 static device_method_t altera_jtag_uart_fdt_methods[] = {
  137         DEVMETHOD(device_probe,         altera_jtag_uart_fdt_probe),
  138         DEVMETHOD(device_attach,        altera_jtag_uart_fdt_attach),
  139         DEVMETHOD(device_detach,        altera_jtag_uart_fdt_detach),
  140         { 0, 0 }
  141 };
  142 
  143 static driver_t altera_jtag_uart_fdt_driver = {
  144         "altera_jtag_uart",
  145         altera_jtag_uart_fdt_methods,
  146         sizeof(struct altera_jtag_uart_softc),
  147 };
  148 
  149 DRIVER_MODULE(altera_jtag_uart, simplebus, altera_jtag_uart_fdt_driver,
  150     altera_jtag_uart_devclass, 0, 0);

Cache object: 178491453cb8df28692c0f303229d3a8


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