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/*-
* Copyright (c) 2009-2010 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Semihalf 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_platform.h"
#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/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_bus.h>
#include <dev/uart/uart_cpu.h>
#include <dev/uart/uart_cpu_fdt.h>
/*
* 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 (b1->bst != b2->bst)
return (0);
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);
}
static int
phandle_chosen_propdev(phandle_t chosen, const char *name, phandle_t *node)
{
char buf[64];
if (OF_getprop(chosen, name, buf, sizeof(buf)) <= 0)
return (ENXIO);
if ((*node = OF_finddevice(buf)) == -1)
return (ENXIO);
return (0);
}
static const struct ofw_compat_data *
uart_fdt_find_compatible(phandle_t node, const struct ofw_compat_data *cd)
{
const struct ofw_compat_data *ocd;
for (ocd = cd; ocd->ocd_str != NULL; ocd++) {
if (fdt_is_compatible(node, ocd->ocd_str))
return (ocd);
}
return (NULL);
}
static uintptr_t
uart_fdt_find_by_node(phandle_t node, int class_list)
{
struct ofw_compat_data **cd;
const struct ofw_compat_data *ocd;
if (class_list) {
SET_FOREACH(cd, uart_fdt_class_set) {
ocd = uart_fdt_find_compatible(node, *cd);
if ((ocd != NULL) && (ocd->ocd_data != 0))
return (ocd->ocd_data);
}
} else {
SET_FOREACH(cd, uart_fdt_class_and_device_set) {
ocd = uart_fdt_find_compatible(node, *cd);
if ((ocd != NULL) && (ocd->ocd_data != 0))
return (ocd->ocd_data);
}
}
return (0);
}
int
uart_cpu_getdev(int devtype, struct uart_devinfo *di)
{
const char *propnames[] = {"stdout-path", "linux,stdout-path", "stdout",
"stdin-path", "stdin", NULL};
const char **name;
struct uart_class *class;
phandle_t node, chosen;
pcell_t shift, br, rclk;
char *cp;
int err;
/* Allow overriding the FDT using the environment. */
class = &uart_ns8250_class;
err = uart_getenv(devtype, di, class);
if (!err)
return (0);
if (devtype != UART_DEV_CONSOLE)
return (ENXIO);
/* Has the user forced a specific device node? */
cp = kern_getenv("hw.fdt.console");
if (cp == NULL) {
/*
* Retrieve /chosen/std{in,out}.
*/
node = -1;
if ((chosen = OF_finddevice("/chosen")) != -1) {
for (name = propnames; *name != NULL; name++) {
if (phandle_chosen_propdev(chosen, *name,
&node) == 0)
break;
}
}
if (chosen == -1 || *name == NULL)
node = OF_finddevice("serial0"); /* Last ditch */
} else {
node = OF_finddevice(cp);
}
if (node == -1) /* Can't find anything */
return (ENXIO);
/*
* Check old style of UART definition first. Unfortunately, the common
* FDT processing is not possible if we have clock, power domains and
* pinmux stuff.
*/
class = (struct uart_class *)uart_fdt_find_by_node(node, 0);
if (class != NULL) {
if ((err = uart_fdt_get_clock(node, &rclk)) != 0)
return (err);
} else {
/* Check class only linker set */
class =
(struct uart_class *)uart_fdt_find_by_node(node, 1);
if (class == NULL)
return (ENXIO);
rclk = 0;
}
/*
* Retrieve serial attributes.
*/
if (uart_fdt_get_shift(node, &shift) != 0)
shift = uart_getregshift(class);
if (OF_getencprop(node, "current-speed", &br, sizeof(br)) <= 0)
br = 0;
/*
* Finalize configuration.
*/
di->bas.chan = 0;
di->bas.regshft = (u_int)shift;
di->baudrate = br;
di->bas.rclk = (u_int)rclk;
di->ops = uart_getops(class);
di->databits = 8;
di->stopbits = 1;
di->parity = UART_PARITY_NONE;
err = OF_decode_addr(node, 0, &di->bas.bst, &di->bas.bsh, NULL);
uart_bus_space_mem = di->bas.bst;
uart_bus_space_io = NULL;
return (err);
}
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