freebsd-dev/sys/dev/uart/uart_cpu_powerpc.c
Justin Hibbits 24f4202df8 Check all compatible strings on uart devices in powerpc
Summary:
Some device trees put "fsl,ns16650" first in the compatible list.  This causes
the probe code to choke, even though the device is compatible with ns16650, and
has it listed later in the tree.

Reviewed by:	nwhitehorn
MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D7676
2016-08-28 21:31:21 +00:00

204 lines
5.3 KiB
C

/*-
* Copyright (c) 2006 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/ofw_machdep.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/openfirm.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_cpu.h>
bus_space_tag_t uart_bus_space_io = &bs_le_tag;
bus_space_tag_t uart_bus_space_mem = &bs_le_tag;
int
uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
{
return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
}
static int
ofw_get_uart_console(phandle_t opts, phandle_t *result, const char *inputdev,
const char *outputdev)
{
char buf[64];
phandle_t input;
if (OF_getprop(opts, inputdev, buf, sizeof(buf)) == -1)
return (ENXIO);
input = OF_finddevice(buf);
if (input == -1)
return (ENXIO);
if (outputdev != NULL) {
if (OF_getprop(opts, outputdev, buf, sizeof(buf)) == -1)
return (ENXIO);
if (OF_finddevice(buf) != input)
return (ENXIO);
}
*result = input;
return (0);
}
static int
ofw_get_console_phandle_path(phandle_t node, phandle_t *result,
const char *prop)
{
union {
char buf[64];
phandle_t ref;
} field;
phandle_t output;
ssize_t size;
size = OF_getproplen(node, prop);
if (size == -1)
return (ENXIO);
OF_getprop(node, prop, &field, sizeof(field));
/* This property might be either a ihandle or path. Hooray. */
output = -1;
if (field.buf[size - 1] == 0)
output = OF_finddevice(field.buf);
if (output == -1 && size == 4)
output = OF_instance_to_package(field.ref);
if (output != -1) {
*result = output;
return (0);
}
return (ENXIO);
}
int
uart_cpu_getdev(int devtype, struct uart_devinfo *di)
{
char buf[64];
struct uart_class *class;
phandle_t input, opts, chosen;
int error;
opts = OF_finddevice("/options");
chosen = OF_finddevice("/chosen");
switch (devtype) {
case UART_DEV_CONSOLE:
error = ENXIO;
if (chosen != -1 && error != 0)
error = ofw_get_uart_console(chosen, &input,
"stdout-path", NULL);
if (chosen != -1 && error != 0)
error = ofw_get_uart_console(chosen, &input,
"linux,stdout-path", NULL);
if (chosen != -1 && error != 0)
error = ofw_get_console_phandle_path(chosen, &input,
"stdout");
if (chosen != -1 && error != 0)
error = ofw_get_uart_console(chosen, &input,
"stdin-path", NULL);
if (chosen != -1 && error != 0)
error = ofw_get_console_phandle_path(chosen, &input,
"stdin");
if (opts != -1 && error != 0)
error = ofw_get_uart_console(opts, &input,
"input-device", "output-device");
if (opts != -1 && error != 0)
error = ofw_get_uart_console(opts, &input,
"input-device-1", "output-device-1");
if (error != 0) {
input = OF_finddevice("serial0"); /* Last ditch */
if (input == -1)
error = (ENXIO);
}
if (error != 0)
return (error);
break;
case UART_DEV_DBGPORT:
if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf)))
return (ENXIO);
input = OF_finddevice(buf);
if (input == -1)
return (ENXIO);
break;
default:
return (EINVAL);
}
if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
return (ENXIO);
if (strcmp(buf, "serial") != 0)
return (ENXIO);
if (ofw_bus_node_is_compatible(input, "chrp,es")) {
class = &uart_z8530_class;
di->bas.regshft = 4;
di->bas.chan = 1;
} else if (ofw_bus_node_is_compatible(input,"ns16550") ||
ofw_bus_node_is_compatible(input,"ns8250")) {
class = &uart_ns8250_class;
di->bas.regshft = 0;
di->bas.chan = 0;
} else
return (ENXIO);
if (class == NULL)
return (ENXIO);
error = OF_decode_addr(input, 0, &di->bas.bst, &di->bas.bsh, NULL);
if (error)
return (error);
di->ops = uart_getops(class);
if (OF_getprop(input, "clock-frequency", &di->bas.rclk,
sizeof(di->bas.rclk)) == -1)
di->bas.rclk = 230400;
if (OF_getprop(input, "current-speed", &di->baudrate,
sizeof(di->baudrate)) == -1)
di->baudrate = 0;
OF_getprop(input, "reg-shift", &di->bas.regshft,
sizeof(di->bas.regshft));
di->databits = 8;
di->stopbits = 1;
di->parity = UART_PARITY_NONE;
return (0);
}