FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart.h

     /*-
      * Copyright (c) 2003 Marcel Moolenaar
      * 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 ``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 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 SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _DEV_UART_H_
    #define _DEV_UART_H_
    
    /*
     * Bus access structure. This structure holds the minimum information needed
     * to access the UART. The rclk field, although not important to actually
     * access the UART, is important for baudrate programming, delay loops and
     * other timing related computations.
     */
    struct uart_bas {
            bus_space_tag_t bst;
            bus_space_handle_t bsh;
            u_int   chan;
            u_int   rclk;
            u_int   regshft;
    };
    
    #define uart_regofs(bas, reg)           ((reg) << (bas)->regshft)
    
    #define uart_getreg(bas, reg)           \
            bus_space_read_1((bas)->bst, (bas)->bsh, uart_regofs(bas, reg))
    #define uart_setreg(bas, reg, value)    \
            bus_space_write_1((bas)->bst, (bas)->bsh, uart_regofs(bas, reg), value)
    
    /* 16-bit I/O (e.g. to divisor latch) */
    #define uart_getdreg(bas, reg)          \
            bus_space_read_2((bas)->bst, (bas)->bsh, uart_regofs(bas, reg))
    #define uart_setdreg(bas, reg, value)   \
            bus_space_write_2((bas)->bst, (bas)->bsh, uart_regofs(bas, reg), value)
    
    /*
     * XXX we don't know the length of the bus space address range in use by
     * the UART. Since barriers don't use the length field currently, we put
     * a zero there for now.
     */
    #define uart_barrier(bas)               \
            bus_space_barrier((bas)->bst, (bas)->bsh, 0, 0,         \
                BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE)
    
    /*
     * Device flags.
     */
    #define UART_FLAGS_CONSOLE(f)           ((f) & 0x10)
    #define UART_FLAGS_DBGPORT(f)           ((f) & 0x80)
    
    /*
     * Data parity values (magical numbers related to ns8250).
     */
    #define UART_PARITY_NONE                0
    #define UART_PARITY_ODD                 1
    #define UART_PARITY_EVEN                3
    #define UART_PARITY_MARK                5
    #define UART_PARITY_SPACE               7
    
    #endif /* _DEV_UART_H_ */

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