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/mips/atheros/uart_bus_ar71xx.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
    5  * All rights reserved.
    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  */
   27 #include "opt_uart.h"
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/12/sys/mips/atheros/uart_bus_ar71xx.c 338074 2018-08-19 21:10:21Z mmacy $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/conf.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 
   39 #include <machine/bus.h>
   40 
   41 #include <dev/uart/uart.h>
   42 #include <dev/uart/uart_cpu.h>
   43 #include <dev/uart/uart_bus.h>
   44 
   45 #include <mips/atheros/ar71xxreg.h>
   46 #include <mips/atheros/ar71xx_cpudef.h>
   47 
   48 #include "uart_if.h"
   49 
   50 static int uart_ar71xx_probe(device_t dev);
   51 extern struct uart_class uart_ar71xx_uart_class;
   52 
   53 static device_method_t uart_ar71xx_methods[] = {
   54         /* Device interface */
   55         DEVMETHOD(device_probe,         uart_ar71xx_probe),
   56         DEVMETHOD(device_attach,        uart_bus_attach),
   57         DEVMETHOD(device_detach,        uart_bus_detach),
   58         { 0, 0 }
   59 };
   60 
   61 static driver_t uart_ar71xx_driver = {
   62         uart_driver_name,
   63         uart_ar71xx_methods,
   64         sizeof(struct uart_softc),
   65 };
   66 
   67 extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
   68 
   69 static int
   70 uart_ar71xx_probe(device_t dev)
   71 {
   72         struct uart_softc *sc;
   73         uint64_t freq;
   74 
   75         freq = ar71xx_uart_freq();
   76 
   77         sc = device_get_softc(dev);
   78         sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
   79         sc->sc_class = &uart_ns8250_class;
   80         bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
   81         sc->sc_sysdev->bas.regshft = 2;
   82         sc->sc_sysdev->bas.bst = mips_bus_space_generic;
   83         sc->sc_sysdev->bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR) + 3;
   84         sc->sc_bas.regshft = 2;
   85         sc->sc_bas.bst = mips_bus_space_generic;
   86         sc->sc_bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR) + 3;
   87 
   88         return (uart_bus_probe(dev, 2, 0, freq, 0, 0, 0));
   89 }
   90 
   91 #ifdef  EARLY_PRINTF
   92 static void
   93 ar71xx_early_putc(int c)
   94 {
   95         int i;
   96 
   97         for (i = 0; i < 1000; i++) {
   98                 if (ATH_READ_REG(AR71XX_UART_ADDR + AR71XX_UART_LSR)
   99                     & AR71XX_UART_LSR_THRE)
  100                         break;
  101         }
  102 
  103         ATH_WRITE_REG(AR71XX_UART_ADDR + AR71XX_UART_THR, (c & 0xff));
  104 }
  105 early_putc_t *early_putc = ar71xx_early_putc;
  106 #endif
  107 
  108 DRIVER_MODULE(uart, apb, uart_ar71xx_driver, uart_devclass, 0, 0);

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