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Diffstat (limited to 'sys/dev/uart/uart.h')
| -rw-r--r-- | sys/dev/uart/uart.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/sys/dev/uart/uart.h b/sys/dev/uart/uart.h new file mode 100644 index 0000000..1ea90c0 --- /dev/null +++ b/sys/dev/uart/uart.h @@ -0,0 +1,82 @@ +/* + * 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 regshft; + u_int rclk; +}; + +#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_ */ |
