774c078edd
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
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2003, 2004 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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#include "opt_acpi.h"
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_cpu.h>
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#include <dev/uart/uart_cpu_acpi.h>
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bus_space_tag_t uart_bus_space_io = X86_BUS_SPACE_IO;
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bus_space_tag_t uart_bus_space_mem = X86_BUS_SPACE_MEM;
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int
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uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
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{
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return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
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}
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int
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uart_cpu_getdev(int devtype, struct uart_devinfo *di)
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{
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struct uart_class *class;
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unsigned int i, ivar;
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class = &uart_ns8250_class;
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if (class == NULL)
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return (ENXIO);
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/* Check the environment. */
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if (uart_getenv(devtype, di, class) == 0)
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return (0);
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#ifdef DEV_ACPI
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/* Check if SPCR can tell us what console to use. */
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if (uart_cpu_acpi_spcr(devtype, di) == 0)
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return (0);
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#endif
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/*
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* Scan the hints. We only try units 0 to 3 (inclusive). This
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* covers the ISA legacy where 4 UARTs had their resources
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* predefined.
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*/
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for (i = 0; i < 4; i++) {
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if (resource_int_value("uart", i, "flags", &ivar))
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continue;
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if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
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continue;
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if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
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continue;
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/*
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* We have a possible device. Make sure it's enabled and
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* that we have an I/O port.
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*/
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if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
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ivar != 0)
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continue;
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if (resource_int_value("uart", i, "port", &ivar) != 0 ||
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ivar == 0)
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continue;
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/*
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* Got it. Fill in the instance and return it. We only have
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* ns8250 and successors on i386.
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*/
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di->ops = uart_getops(class);
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di->bas.chan = 0;
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di->bas.bst = uart_bus_space_io;
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if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0,
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&di->bas.bsh) != 0)
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continue;
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di->bas.regshft = 0;
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di->bas.rclk = 0;
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if (resource_int_value("uart", i, "baud", &ivar) != 0)
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ivar = 0;
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di->baudrate = ivar;
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di->databits = 8;
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di->stopbits = 1;
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di->parity = UART_PARITY_NONE;
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return (0);
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}
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return (ENXIO);
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}
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