7f166c931e
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
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2003, 2004 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.
|
|
*/
|
|
|
|
#include "opt_acpi.h"
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
|
|
#include <machine/bus.h>
|
|
|
|
#include <dev/uart/uart.h>
|
|
#include <dev/uart/uart_cpu.h>
|
|
#include <dev/uart/uart_cpu_acpi.h>
|
|
|
|
bus_space_tag_t uart_bus_space_io = X86_BUS_SPACE_IO;
|
|
bus_space_tag_t uart_bus_space_mem = X86_BUS_SPACE_MEM;
|
|
|
|
int
|
|
uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
|
|
{
|
|
|
|
return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
|
|
}
|
|
|
|
int
|
|
uart_cpu_getdev(int devtype, struct uart_devinfo *di)
|
|
{
|
|
struct uart_class *class;
|
|
unsigned int i, ivar;
|
|
|
|
class = &uart_ns8250_class;
|
|
if (class == NULL)
|
|
return (ENXIO);
|
|
|
|
/* Check the environment. */
|
|
if (uart_getenv(devtype, di, class) == 0)
|
|
return (0);
|
|
|
|
#ifdef DEV_ACPI
|
|
/* Check if SPCR can tell us what console to use. */
|
|
if (uart_cpu_acpi_spcr(devtype, di) == 0)
|
|
return (0);
|
|
#endif
|
|
|
|
/*
|
|
* Scan the hints. We only try units 0 to 3 (inclusive). This
|
|
* covers the ISA legacy where 4 UARTs had their resources
|
|
* predefined.
|
|
*/
|
|
for (i = 0; i < 4; i++) {
|
|
if (resource_int_value("uart", i, "flags", &ivar))
|
|
continue;
|
|
if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
|
|
continue;
|
|
if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
|
|
continue;
|
|
/*
|
|
* We have a possible device. Make sure it's enabled and
|
|
* that we have an I/O port.
|
|
*/
|
|
if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
|
|
ivar != 0)
|
|
continue;
|
|
if (resource_int_value("uart", i, "port", &ivar) != 0 ||
|
|
ivar == 0)
|
|
continue;
|
|
/*
|
|
* Got it. Fill in the instance and return it. We only have
|
|
* ns8250 and successors on i386.
|
|
*/
|
|
di->ops = uart_getops(class);
|
|
di->bas.chan = 0;
|
|
di->bas.bst = uart_bus_space_io;
|
|
if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0,
|
|
&di->bas.bsh) != 0)
|
|
continue;
|
|
di->bas.regshft = 0;
|
|
di->bas.rclk = 0;
|
|
if (resource_int_value("uart", i, "baud", &ivar) != 0)
|
|
ivar = 0;
|
|
di->baudrate = ivar;
|
|
di->databits = 8;
|
|
di->stopbits = 1;
|
|
di->parity = UART_PARITY_NONE;
|
|
return (0);
|
|
}
|
|
|
|
return (ENXIO);
|
|
}
|