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_cpu_arm64.c

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    1 /*-
    2  * Copyright (c) 2016 The FreeBSD Foundation
    3  *
    4  * This software was developed by Andrew Turner under sponsorship from
    5  * the FreeBSD Foundation.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include "opt_acpi.h"
   30 #include "opt_platform.h"
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include <sys/param.h>
   36 #include <sys/bus.h>
   37 #include <sys/kernel.h>
   38 #include <sys/module.h>
   39 #include <sys/systm.h>
   40 
   41 #include <vm/vm.h>
   42 #include <vm/pmap.h>
   43 
   44 #include <machine/bus.h>
   45 
   46 #include <dev/uart/uart.h>
   47 #include <dev/uart/uart_bus.h>
   48 #include <dev/uart/uart_cpu.h>
   49 
   50 #ifdef DEV_ACPI
   51 #include <contrib/dev/acpica/include/acpi.h>
   52 #include <contrib/dev/acpica/include/accommon.h>
   53 #include <contrib/dev/acpica/include/actables.h>
   54 #include <dev/uart/uart_cpu_acpi.h>
   55 #endif
   56 
   57 #ifdef FDT
   58 #include <dev/fdt/fdt_common.h>
   59 #include <dev/ofw/ofw_bus.h>
   60 #include <dev/ofw/ofw_bus_subr.h>
   61 #include <dev/uart/uart_cpu_fdt.h>
   62 #endif
   63 
   64 /*
   65  * UART console routines.
   66  */
   67 extern struct bus_space memmap_bus;
   68 bus_space_tag_t uart_bus_space_io;
   69 bus_space_tag_t uart_bus_space_mem = &memmap_bus;
   70 
   71 int
   72 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   73 {
   74 
   75         if (pmap_kextract(b1->bsh) == 0)
   76                 return (0);
   77         if (pmap_kextract(b2->bsh) == 0)
   78                 return (0);
   79         return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
   80 }
   81 
   82 #ifdef FDT
   83 static int
   84 uart_cpu_fdt_setup(struct uart_class *class, int devtype, struct uart_devinfo *di)
   85 {
   86         bus_space_handle_t bsh;
   87         bus_space_tag_t bst;
   88         u_int rclk, shift, iowidth;
   89         int br, err;
   90 
   91         err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk,
   92             &shift, &iowidth, devtype);
   93         if (err != 0)
   94                 return (err);
   95 
   96         /*
   97          * Finalize configuration.
   98          */
   99         di->bas.chan = 0;
  100         di->bas.regshft = shift;
  101         di->bas.regiowidth = iowidth;
  102         di->baudrate = br;
  103         di->bas.rclk = rclk;
  104         di->ops = uart_getops(class);
  105         di->databits = 8;
  106         di->stopbits = 1;
  107         di->parity = UART_PARITY_NONE;
  108         di->bas.bst = bst;
  109         di->bas.bsh = bsh;
  110         uart_bus_space_mem = di->bas.bst;
  111         uart_bus_space_io = NULL;
  112 
  113         return (0);
  114 }
  115 #endif
  116 
  117 int
  118 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
  119 {
  120         struct uart_class *class;
  121         int err;
  122 
  123         /* Allow overriding ACPI/FDT using the environment. */
  124         class = &uart_ns8250_class;
  125         err = uart_getenv(devtype, di, class);
  126         if (err == 0)
  127                 return (0);
  128 
  129 #ifdef DEV_ACPI
  130         /* Check if SPCR can tell us what console to use. */
  131         if (uart_cpu_acpi_spcr(devtype, di) == 0)
  132                 return (0);
  133 #endif
  134 #ifdef FDT
  135         if (uart_cpu_fdt_setup(class, devtype, di) == 0)
  136                 return (0);
  137 #endif
  138 
  139         return (ENXIO);
  140 }

Cache object: 6812d7a0b12db97876e6159bb2878265


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