84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
/*
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* Copyright (c) 2003 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _DEV_UART_H_
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#define _DEV_UART_H_
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/*
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* Bus access structure. This structure holds the minimum information needed
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* to access the UART. The rclk field, although not important to actually
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* access the UART, is important for baudrate programming, delay loops and
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* other timing related computations.
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*/
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struct uart_bas {
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bus_addr_t iobase;
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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u_int regshft;
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u_int rclk;
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};
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#define uart_regofs(bas, reg) ((reg) << (bas)->regshft)
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#define uart_getreg(bas, reg) \
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bus_space_read_1((bas)->bst, (bas)->bsh, uart_regofs(bas, reg))
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#define uart_setreg(bas, reg, value) \
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bus_space_write_1((bas)->bst, (bas)->bsh, uart_regofs(bas, reg), value)
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/* 16-bit I/O (e.g. to divisor latch) */
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#define uart_getdreg(bas, reg) \
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bus_space_read_2((bas)->bst, (bas)->bsh, uart_regofs(bas, reg))
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#define uart_setdreg(bas, reg, value) \
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bus_space_write_2((bas)->bst, (bas)->bsh, uart_regofs(bas, reg), value)
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/*
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* XXX we don't know the length of the bus space address range in use by
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* the UART. Since barriers don't use the length field currently, we put
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* a zero there for now.
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*/
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#define uart_barrier(bas) \
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bus_space_barrier((bas)->bst, (bas)->bsh, 0, 0, \
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BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE)
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/*
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* Device flags.
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*/
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#define UART_FLAGS_CONSOLE(f) ((f) & 0x10)
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#define UART_FLAGS_DBGPORT(f) ((f) & 0x80)
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/*
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* Data parity values (magical numbers related to ns8250).
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*/
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#define UART_PARITY_NONE 0
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#define UART_PARITY_ODD 1
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#define UART_PARITY_EVEN 3
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#define UART_PARITY_MARK 5
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#define UART_PARITY_SPACE 7
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#endif /* _DEV_UART_H_ */
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