freebsd-dev/sys/dev/uart/uart_cpu_arm64.c
Matt Macy 381388b9c4 add snps IP uart support / genaralize UART
This is an amalgam of a patch by Doug Ambrisko to
generalize uart_acpi_find_device, imp moving the
ACPI table to uart_dev_ns8250.c and advice by jhb
to work around a bug in the EPYC 3151 BIOS
(the BIOS incorrectly marks the serial ports as
disabled)

Reviewed by: imp
MFC after: 8 weeks
Differential Revision: https://reviews.freebsd.org/D16432
2018-08-19 21:10:21 +00:00

212 lines
4.9 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.
*/
bus_space_tag_t uart_bus_space_io;
bus_space_tag_t uart_bus_space_mem;
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);
}
#ifdef DEV_ACPI
static struct acpi_uart_compat_data *
uart_cpu_acpi_scan(uint8_t interface_type)
{
struct acpi_uart_compat_data **cd, *curcd;
int i;
SET_FOREACH(cd, uart_acpi_class_and_device_set) {
curcd = *cd;
for (i = 0; curcd[i].cd_hid != NULL; i++) {
if (curcd[i].cd_port_subtype == interface_type)
return (&curcd[i]);
}
}
SET_FOREACH(cd, uart_acpi_class_set) {
curcd = *cd;
for (i = 0; curcd[i].cd_hid != NULL; i++) {
if (curcd[i].cd_port_subtype == interface_type)
return (&curcd[i]);
}
}
return (NULL);
}
static int
uart_cpu_acpi_probe(struct uart_class **classp, bus_space_tag_t *bst,
bus_space_handle_t *bsh, int *baud, u_int *rclk, u_int *shiftp,
u_int *iowidthp)
{
struct acpi_uart_compat_data *cd;
ACPI_TABLE_SPCR *spcr;
vm_paddr_t spcr_physaddr;
int err;
err = ENXIO;
spcr_physaddr = acpi_find_table(ACPI_SIG_SPCR);
if (spcr_physaddr == 0)
return (ENXIO);
spcr = acpi_map_table(spcr_physaddr, ACPI_SIG_SPCR);
cd = uart_cpu_acpi_scan(spcr->InterfaceType);
if (cd == NULL)
goto out;
switch(spcr->BaudRate) {
case 3:
*baud = 9600;
break;
case 4:
*baud = 19200;
break;
case 6:
*baud = 57600;
break;
case 7:
*baud = 115200;
break;
default:
goto out;
}
err = acpi_map_addr(&spcr->SerialPort, bst, bsh, PAGE_SIZE);
if (err != 0)
goto out;
*classp = cd->cd_class;
*rclk = 0;
*shiftp = 2;
*iowidthp = spcr->SerialPort.BitWidth / 8;
out:
acpi_unmap_table(spcr);
return (err);
}
#endif
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);
if (devtype != UART_DEV_CONSOLE)
return (ENXIO);
err = ENXIO;
#ifdef DEV_ACPI
err = uart_cpu_acpi_probe(&class, &bst, &bsh, &br, &rclk, &shift,
&iowidth);
#endif
#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);
}