130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* 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;
|
|
u_int regiowidth;
|
|
u_int busy_detect;
|
|
};
|
|
|
|
#define uart_regofs(bas, reg) ((reg) << (bas)->regshft)
|
|
#define uart_regiowidth(bas) ((bas)->regiowidth)
|
|
|
|
static inline uint32_t
|
|
uart_getreg(struct uart_bas *bas, int reg)
|
|
{
|
|
uint32_t ret;
|
|
|
|
switch (uart_regiowidth(bas)) {
|
|
case 4:
|
|
ret = bus_space_read_4(bas->bst, bas->bsh, uart_regofs(bas, reg));
|
|
break;
|
|
case 2:
|
|
ret = bus_space_read_2(bas->bst, bas->bsh, uart_regofs(bas, reg));
|
|
break;
|
|
default:
|
|
ret = bus_space_read_1(bas->bst, bas->bsh, uart_regofs(bas, reg));
|
|
break;
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
static inline void
|
|
uart_setreg(struct uart_bas *bas, int reg, int value)
|
|
{
|
|
|
|
switch (uart_regiowidth(bas)) {
|
|
case 4:
|
|
bus_space_write_4(bas->bst, bas->bsh, uart_regofs(bas, reg), value);
|
|
break;
|
|
case 2:
|
|
bus_space_write_2(bas->bst, bas->bsh, uart_regofs(bas, reg), value);
|
|
break;
|
|
default:
|
|
bus_space_write_1(bas->bst, bas->bsh, uart_regofs(bas, reg), value);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
|
|
/*
|
|
* UART device classes.
|
|
*/
|
|
struct uart_class;
|
|
|
|
extern struct uart_class uart_ns8250_class __attribute__((weak));
|
|
extern struct uart_class uart_quicc_class __attribute__((weak));
|
|
extern struct uart_class uart_s3c2410_class __attribute__((weak));
|
|
extern struct uart_class uart_sbbc_class __attribute__((weak));
|
|
extern struct uart_class uart_z8530_class __attribute__((weak));
|
|
|
|
/*
|
|
* Device flags.
|
|
*/
|
|
#define UART_FLAGS_CONSOLE(f) ((f) & 0x10)
|
|
#define UART_FLAGS_DBGPORT(f) ((f) & 0x80)
|
|
#define UART_FLAGS_FCR_RX_LOW(f) ((f) & 0x100)
|
|
#define UART_FLAGS_FCR_RX_MEDL(f) ((f) & 0x200)
|
|
#define UART_FLAGS_FCR_RX_MEDH(f) ((f) & 0x400)
|
|
#define UART_FLAGS_FCR_RX_HIGH(f) ((f) & 0x800)
|
|
|
|
/*
|
|
* 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_ */
|