freebsd-dev/sys/dev/uart/uart_cpu_arm64.c
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

136 lines
3.6 KiB
C

/*-
* 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.
*/
#include "opt_acpi.h"
#include "opt_platform.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_bus.h>
#include <dev/uart/uart_cpu.h>
#ifdef DEV_ACPI
#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <contrib/dev/acpica/include/actables.h>
#include <dev/uart/uart_cpu_acpi.h>
#endif
#ifdef FDT
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/uart/uart_cpu_fdt.h>
#endif
/*
* UART console routines.
*/
extern struct bus_space memmap_bus;
bus_space_tag_t uart_bus_space_io;
bus_space_tag_t uart_bus_space_mem = &memmap_bus;
int
uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
{
if (pmap_kextract(b1->bsh) == 0)
return (0);
if (pmap_kextract(b2->bsh) == 0)
return (0);
return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
}
int
uart_cpu_getdev(int devtype, struct uart_devinfo *di)
{
struct uart_class *class;
bus_space_handle_t bsh;
bus_space_tag_t bst;
u_int rclk, shift, iowidth;
int br, err;
/* Allow overriding the FDT using the environment. */
class = &uart_ns8250_class;
err = uart_getenv(devtype, di, class);
if (err == 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
if (devtype != UART_DEV_CONSOLE)
return (ENXIO);
err = ENXIO;
#ifdef FDT
if (err != 0) {
err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk,
&shift, &iowidth);
}
#endif
if (err != 0)
return (err);
/*
* Finalize configuration.
*/
di->bas.chan = 0;
di->bas.regshft = shift;
di->bas.regiowidth = iowidth;
di->baudrate = br;
di->bas.rclk = rclk;
di->ops = uart_getops(class);
di->databits = 8;
di->stopbits = 1;
di->parity = UART_PARITY_NONE;
di->bas.bst = bst;
di->bas.bsh = bsh;
uart_bus_space_mem = di->bas.bst;
uart_bus_space_io = NULL;
return (0);
}