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/uart/uart_bus_acpi.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2001 M. Warner Losh <imp@FreeBSD.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/conf.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <machine/bus.h>
   37 #include <sys/rman.h>
   38 #include <machine/resource.h>
   39 
   40 #include <dev/uart/uart.h>
   41 #include <dev/uart/uart_bus.h>
   42 #include <dev/uart/uart_cpu_acpi.h>
   43 #include <contrib/dev/acpica/include/acpi.h>
   44 #include <contrib/dev/acpica/include/accommon.h>
   45 #include <dev/acpica/acpivar.h>
   46 
   47 static int uart_acpi_probe(device_t dev);
   48 
   49 static device_method_t uart_acpi_methods[] = {
   50         /* Device interface */
   51         DEVMETHOD(device_probe,         uart_acpi_probe),
   52         DEVMETHOD(device_attach,        uart_bus_attach),
   53         DEVMETHOD(device_detach,        uart_bus_detach),
   54         DEVMETHOD(device_resume,        uart_bus_resume),
   55         { 0, 0 }
   56 };
   57 
   58 static driver_t uart_acpi_driver = {
   59         uart_driver_name,
   60         uart_acpi_methods,
   61         sizeof(struct uart_softc),
   62 };
   63 
   64 static struct acpi_uart_compat_data *
   65 uart_acpi_find_device(device_t dev)
   66 {
   67         struct acpi_uart_compat_data **cd, *cd_it;
   68         ACPI_HANDLE h;
   69 
   70         if ((h = acpi_get_handle(dev)) == NULL)
   71                 return (NULL);
   72 
   73         SET_FOREACH(cd, uart_acpi_class_and_device_set) {
   74                 for (cd_it = *cd; cd_it->cd_hid != NULL; cd_it++) {
   75                         if (acpi_MatchHid(h, cd_it->cd_hid))
   76                                 return (cd_it);
   77                 }
   78         }
   79 
   80         return (NULL);
   81 }
   82 
   83 static int
   84 uart_acpi_probe(device_t dev)
   85 {
   86         struct uart_softc *sc;
   87         struct acpi_uart_compat_data *cd;
   88 
   89         sc = device_get_softc(dev);
   90 
   91         if ((cd = uart_acpi_find_device(dev)) != NULL) {
   92                 sc->sc_class = cd->cd_class;
   93                 if (cd->cd_desc != NULL)
   94                         device_set_desc(dev, cd->cd_desc);
   95                 return (uart_bus_probe(dev, cd->cd_regshft, cd->cd_regiowidth,
   96                     cd->cd_rclk, 0, 0, cd->cd_quirks));
   97         }
   98         return (ENXIO);
   99 }
  100 
  101 DRIVER_MODULE(uart, acpi, uart_acpi_driver, uart_devclass, 0, 0);

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