FreeBSD/Linux Kernel Cross Reference
sys/mips/atheros/uart_bus_ar933x.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2012, Adrian Chadd <adrian@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     */
    #include "opt_uart.h"
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/mips/atheros/uart_bus_ar933x.c 338074 2018-08-19 21:10:21Z mmacy $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    
    #include <machine/bus.h>
    
    #include <dev/uart/uart.h>
    #include <dev/uart/uart_cpu.h>
    #include <dev/uart/uart_bus.h>
    
    #include <mips/atheros/ar71xxreg.h>
    #include <mips/atheros/ar71xx_cpudef.h>
    
    #include <mips/atheros/uart_dev_ar933x.h>
    #ifdef  EARLY_PRINTF
    #include <mips/atheros/ar933x_uart.h>
    #endif
    
    #include "uart_if.h"
    
    static int uart_ar933x_probe(device_t dev);
    extern struct uart_class uart_ar933x_uart_class;
    
    static device_method_t uart_ar933x_methods[] = {
            /* Device interface */
            DEVMETHOD(device_probe,         uart_ar933x_probe),
            DEVMETHOD(device_attach,        uart_bus_attach),
            DEVMETHOD(device_detach,        uart_bus_detach),
            { 0, 0 }
    };
    
    static driver_t uart_ar933x_driver = {
            uart_driver_name,
            uart_ar933x_methods,
            sizeof(struct uart_softc),
    };
    
    extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
    
    static int
    uart_ar933x_probe(device_t dev)
    {
            struct uart_softc *sc;
            uint64_t freq;
    
            freq = ar71xx_uart_freq();
    
            sc = device_get_softc(dev);
            sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
            sc->sc_class = &uart_ar933x_class;
            bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
            sc->sc_sysdev->bas.regshft = 0;
            sc->sc_sysdev->bas.bst = mips_bus_space_generic;
            sc->sc_sysdev->bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
            sc->sc_bas.regshft = 0;
            sc->sc_bas.bst = mips_bus_space_generic;
            sc->sc_bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
    
            return (uart_bus_probe(dev, 2, 0, freq, 0, 0, 0));
    }
    
    /*
     * Assume the UART is setup by the bootloader and just echo that.
     */
    #if     defined(EARLY_PRINTF)
   static void
   ar933x_early_putc(int c)
   {
           int i = 1000;
   
           /* Wait until FIFO is clear */
           while ((i > 0) && (ATH_READ_REG(AR71XX_UART_ADDR + AR933X_UART_CS_REG) &
                AR933X_UART_CS_TX_BUSY))
                   i--;
   
           /* Write it out */
           ATH_WRITE_REG(AR71XX_UART_ADDR + AR933X_UART_DATA_REG,
               (c  & 0xff)| AR933X_UART_DATA_TX_CSR);
   }
   early_putc_t *early_putc = ar933x_early_putc;
   #endif  /* EARLY_PRINTF */
   
   DRIVER_MODULE(uart, apb, uart_ar933x_driver, uart_devclass, 0, 0);

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