uart_cpu_fdt.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009-2010 The FreeBSD Foundation
    5  *
    6  * This software was developed by Semihalf under sponsorship from
    7  * the FreeBSD Foundation.
    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 "opt_platform.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/bus.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/systm.h>
   41 
   42 #include <vm/vm.h>
   43 #include <vm/pmap.h>
   44 
   45 #include <machine/bus.h>
   46 
   47 #include <dev/fdt/fdt_common.h>
   48 #include <dev/ofw/ofw_bus.h>
   49 #include <dev/ofw/ofw_bus_subr.h>
   50 #include <dev/uart/uart.h>
   51 #include <dev/uart/uart_bus.h>
   52 #include <dev/uart/uart_cpu.h>
   53 #include <dev/uart/uart_cpu_fdt.h>
   54 
   55 /*
   56  * UART console routines.
   57  */
   58 bus_space_tag_t uart_bus_space_io;
   59 bus_space_tag_t uart_bus_space_mem;
   60 
   61 int
   62 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   63 {
   64 
   65         if (b1->bst != b2->bst)
   66                 return (0);
   67         if (pmap_kextract(b1->bsh) == 0)
   68                 return (0);
   69         if (pmap_kextract(b2->bsh) == 0)
   70                 return (0);
   71         return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
   72 }
   73 
   74 int
   75 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
   76 {
   77         struct uart_class *class;
   78         bus_space_tag_t bst;
   79         bus_space_handle_t bsh;
   80         u_int shift, iowidth, rclk;
   81         int br, err;
   82 
   83         /* Allow overriding the FDT using the environment. */
   84         class = &uart_ns8250_class;
   85         err = uart_getenv(devtype, di, class);
   86         if (!err)
   87                 return (0);
   88 
   89         err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk,
   90             &shift, &iowidth, devtype);
   91         if (err != 0)
   92                 return (err);
   93 
   94         /*
   95          * Finalize configuration.
   96          */
   97         di->bas.chan = 0;
   98         di->bas.regshft = shift;
   99         di->bas.regiowidth = iowidth;
  100         di->baudrate = br;
  101         di->bas.rclk = rclk;
  102         di->ops = uart_getops(class);
  103         di->databits = 8;
  104         di->stopbits = 1;
  105         di->parity = UART_PARITY_NONE;
  106         di->bas.bst = bst;
  107         di->bas.bsh = bsh;
  108 
  109         uart_bus_space_mem = di->bas.bst;
  110         uart_bus_space_io = NULL;
  111 
  112         return (err);
  113 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/uart/uart_cpu_fdt.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart_cpu_fdt.c