FDT (simplebus) compatible attachment for uart(4).
This will be a single uart(4) attachment code shared by all FDT-enabled platforms. Reviewed by: imp Sponsored by: The FreeBSD Foundation
This commit is contained in:
parent
58158742f2
commit
b618dad3c2
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=208748
200
sys/dev/uart/uart_bus_fdt.c
Normal file
200
sys/dev/uart/uart_bus_fdt.c
Normal file
@ -0,0 +1,200 @@
|
|||||||
|
/*-
|
||||||
|
* 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 <sys/param.h>
|
||||||
|
#include <sys/bus.h>
|
||||||
|
#include <sys/kernel.h>
|
||||||
|
#include <sys/module.h>
|
||||||
|
|
||||||
|
#include <machine/bus.h>
|
||||||
|
#include <machine/fdt.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>
|
||||||
|
|
||||||
|
static int uart_fdt_probe(device_t);
|
||||||
|
|
||||||
|
static device_method_t uart_fdt_methods[] = {
|
||||||
|
/* Device interface */
|
||||||
|
DEVMETHOD(device_probe, uart_fdt_probe),
|
||||||
|
DEVMETHOD(device_attach, uart_bus_attach),
|
||||||
|
DEVMETHOD(device_detach, uart_bus_detach),
|
||||||
|
{ 0, 0 }
|
||||||
|
};
|
||||||
|
|
||||||
|
static driver_t uart_fdt_driver = {
|
||||||
|
uart_driver_name,
|
||||||
|
uart_fdt_methods,
|
||||||
|
sizeof(struct uart_softc),
|
||||||
|
};
|
||||||
|
|
||||||
|
static int
|
||||||
|
uart_fdt_get_clock(phandle_t node, pcell_t *cell)
|
||||||
|
{
|
||||||
|
pcell_t clock;
|
||||||
|
|
||||||
|
if ((OF_getprop(node, "clock-frequency", &clock,
|
||||||
|
sizeof(clock))) <= 0)
|
||||||
|
return (ENXIO);
|
||||||
|
|
||||||
|
if (clock == 0)
|
||||||
|
/* Try to retrieve parent 'bus-frequency' */
|
||||||
|
/* XXX this should go to simple-bus fixup or so */
|
||||||
|
if ((OF_getprop(OF_parent(node), "bus-frequency", &clock,
|
||||||
|
sizeof(clock))) <= 0)
|
||||||
|
clock = 0;
|
||||||
|
|
||||||
|
*cell = fdt32_to_cpu(clock);
|
||||||
|
return (0);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int
|
||||||
|
uart_fdt_get_shift(phandle_t node, pcell_t *cell)
|
||||||
|
{
|
||||||
|
pcell_t shift;
|
||||||
|
|
||||||
|
if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0)
|
||||||
|
shift = 0;
|
||||||
|
*cell = fdt32_to_cpu(shift);
|
||||||
|
return (0);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int
|
||||||
|
uart_fdt_probe(device_t dev)
|
||||||
|
{
|
||||||
|
struct uart_softc *sc;
|
||||||
|
phandle_t node;
|
||||||
|
pcell_t clock, shift;
|
||||||
|
int err;
|
||||||
|
|
||||||
|
if (!ofw_bus_is_compatible(dev, "ns16550"))
|
||||||
|
return (ENXIO);
|
||||||
|
|
||||||
|
sc = device_get_softc(dev);
|
||||||
|
sc->sc_class = &uart_ns8250_class;
|
||||||
|
|
||||||
|
node = ofw_bus_get_node(dev);
|
||||||
|
|
||||||
|
if ((err = uart_fdt_get_clock(node, &clock)) != 0)
|
||||||
|
return (err);
|
||||||
|
uart_fdt_get_shift(node, &shift);
|
||||||
|
|
||||||
|
return (uart_bus_probe(dev, (int)shift, (int)clock, 0, 0));
|
||||||
|
}
|
||||||
|
|
||||||
|
DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* 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)
|
||||||
|
{
|
||||||
|
|
||||||
|
return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
uart_cpu_getdev(int devtype, struct uart_devinfo *di)
|
||||||
|
{
|
||||||
|
char buf[64];
|
||||||
|
struct uart_class *class;
|
||||||
|
phandle_t node, chosen;
|
||||||
|
pcell_t shift, br, rclk;
|
||||||
|
u_long start, size;
|
||||||
|
int err;
|
||||||
|
|
||||||
|
if (devtype != UART_DEV_CONSOLE)
|
||||||
|
return (ENXIO);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Retrieve /chosen/std{in,out}.
|
||||||
|
*/
|
||||||
|
if ((chosen = OF_finddevice("/chosen")) == 0)
|
||||||
|
return (ENXIO);
|
||||||
|
if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0)
|
||||||
|
return (ENXIO);
|
||||||
|
if ((node = OF_finddevice(buf)) == 0)
|
||||||
|
return (ENXIO);
|
||||||
|
if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0)
|
||||||
|
return (ENXIO);
|
||||||
|
if (OF_finddevice(buf) != node)
|
||||||
|
/* Only stdin == stdout is supported. */
|
||||||
|
return (ENXIO);
|
||||||
|
/*
|
||||||
|
* Retrieve serial attributes.
|
||||||
|
*/
|
||||||
|
uart_fdt_get_shift(node, &shift);
|
||||||
|
|
||||||
|
if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0)
|
||||||
|
br = 0;
|
||||||
|
br = fdt32_to_cpu(br);
|
||||||
|
|
||||||
|
if ((err = uart_fdt_get_clock(node, &rclk)) != 0)
|
||||||
|
return (err);
|
||||||
|
/*
|
||||||
|
* Finalize configuration.
|
||||||
|
*/
|
||||||
|
class = &uart_quicc_class;
|
||||||
|
if (fdt_is_compatible(node, "ns16550"))
|
||||||
|
class = &uart_ns8250_class;
|
||||||
|
|
||||||
|
di->bas.chan = 0;
|
||||||
|
di->bas.regshft = (u_int)shift;
|
||||||
|
di->baudrate = 0;
|
||||||
|
di->bas.rclk = (u_int)rclk;
|
||||||
|
di->ops = uart_getops(class);
|
||||||
|
di->databits = 8;
|
||||||
|
di->stopbits = 1;
|
||||||
|
di->parity = UART_PARITY_NONE;
|
||||||
|
di->bas.bst = fdtbus_bs_tag;
|
||||||
|
|
||||||
|
err = fdt_regsize(node, &start, &size);
|
||||||
|
if (err)
|
||||||
|
return (ENXIO);
|
||||||
|
start += FDT_IMMR_VA;
|
||||||
|
|
||||||
|
uart_bus_space_mem = fdtbus_bs_tag;
|
||||||
|
uart_bus_space_io = NULL;
|
||||||
|
|
||||||
|
if (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh) != 0)
|
||||||
|
return (ENXIO);
|
||||||
|
|
||||||
|
return (0);
|
||||||
|
}
|
Loading…
Reference in New Issue
Block a user