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_ar933x.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2012, Adrian Chadd <adrian@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_ar933x.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 <mips/atheros/uart_dev_ar933x.h>
   49 #ifdef  EARLY_PRINTF
   50 #include <mips/atheros/ar933x_uart.h>
   51 #endif
   52 
   53 #include "uart_if.h"
   54 
   55 static int uart_ar933x_probe(device_t dev);
   56 extern struct uart_class uart_ar933x_uart_class;
   57 
   58 static device_method_t uart_ar933x_methods[] = {
   59         /* Device interface */
   60         DEVMETHOD(device_probe,         uart_ar933x_probe),
   61         DEVMETHOD(device_attach,        uart_bus_attach),
   62         DEVMETHOD(device_detach,        uart_bus_detach),
   63         { 0, 0 }
   64 };
   65 
   66 static driver_t uart_ar933x_driver = {
   67         uart_driver_name,
   68         uart_ar933x_methods,
   69         sizeof(struct uart_softc),
   70 };
   71 
   72 extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
   73 
   74 static int
   75 uart_ar933x_probe(device_t dev)
   76 {
   77         struct uart_softc *sc;
   78         uint64_t freq;
   79 
   80         freq = ar71xx_uart_freq();
   81 
   82         sc = device_get_softc(dev);
   83         sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
   84         sc->sc_class = &uart_ar933x_class;
   85         bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
   86         sc->sc_sysdev->bas.regshft = 0;
   87         sc->sc_sysdev->bas.bst = mips_bus_space_generic;
   88         sc->sc_sysdev->bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
   89         sc->sc_bas.regshft = 0;
   90         sc->sc_bas.bst = mips_bus_space_generic;
   91         sc->sc_bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
   92 
   93         return (uart_bus_probe(dev, 2, 0, freq, 0, 0, 0));
   94 }
   95 
   96 /*
   97  * Assume the UART is setup by the bootloader and just echo that.
   98  */
   99 #if     defined(EARLY_PRINTF)
  100 static void
  101 ar933x_early_putc(int c)
  102 {
  103         int i = 1000;
  104 
  105         /* Wait until FIFO is clear */
  106         while ((i > 0) && (ATH_READ_REG(AR71XX_UART_ADDR + AR933X_UART_CS_REG) &
  107              AR933X_UART_CS_TX_BUSY))
  108                 i--;
  109 
  110         /* Write it out */
  111         ATH_WRITE_REG(AR71XX_UART_ADDR + AR933X_UART_DATA_REG,
  112             (c  & 0xff)| AR933X_UART_DATA_TX_CSR);
  113 }
  114 early_putc_t *early_putc = ar933x_early_putc;
  115 #endif  /* EARLY_PRINTF */
  116 
  117 DRIVER_MODULE(uart, apb, uart_ar933x_driver, uart_devclass, 0, 0);

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