freebsd-dev/sys/dev/uart/uart_cpu_acpi.h
Colin Percival 7f166c931e Use ACPI SPCR on x86
This takes the SPCR code currently in uart_cpu_arm64.c, moves it into
a new uart_cpu_acpi.c (with some associated refactoring), and uses it
from both arm64 and x86.

An SPCR serial port address AccessWidth field value of 0 ("reserved")
is now treated as 1 ("byte access") in order to work around a buggy
SPCR table on Amazon EC2 i3.metal instances.

Reviewed by:	manu, Greg V
MFC after:	3 days
Sponsored by:	https://www.patreon.com/cperciva
Differential Revision:	https://reviews.freebsd.org/D20357
2019-05-23 19:55:53 +00:00

73 lines
2.5 KiB
C

/*-
* Copyright (c) 2015 Michal Meloun
* Copyright (c) 2016 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Andrew Turner under
* sponsorship from the FreeBSD Foundation.
*
* 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
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _DEV_UART_CPU_ACPI_H_
#define _DEV_UART_CPU_ACPI_H_
#include <sys/linker_set.h>
struct uart_class;
struct acpi_uart_compat_data {
const char *cd_hid;
struct uart_class *cd_class;
uint16_t cd_port_subtype;
int cd_regshft;
int cd_regiowidth;
int cd_rclk;
int cd_quirks;
const char *cd_desc;
};
/*
* If your UART driver implements only uart_class and uses uart_cpu_acpi.c
* for device instantiation, then use UART_ACPI_CLASS_AND_DEVICE for its
* declaration
*/
SET_DECLARE(uart_acpi_class_and_device_set, struct acpi_uart_compat_data);
#define UART_ACPI_CLASS_AND_DEVICE(data) \
DATA_SET(uart_acpi_class_and_device_set, data)
/*
* If your UART driver implements uart_class and custom device layer,
* then use UART_ACPI_CLASS for its declaration
*/
SET_DECLARE(uart_acpi_class_set, struct acpi_uart_compat_data);
#define UART_ACPI_CLASS(data) \
DATA_SET(uart_acpi_class_set, data)
/* Try to initialize UART device from SPCR data. */
int uart_cpu_acpi_spcr(int devtype, struct uart_devinfo *di);
#endif /* _DEV_UART_CPU_ACPI_H_ */