freebsd-dev/sys/dev/altera/pio/pio.c
Ruslan Bukin 2499610b9a Do not configure Altera PIO device on ARM startup.
PIO is a device implemented in soft-core and becomes
available after flashing FPGA only.
2015-01-04 23:14:04 +00:00

214 lines
5.1 KiB
C

/*-
* Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
* All rights reserved.
*
* This software was developed by SRI International and the University of
* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
* ("CTSRD"), as part of the DARPA CRASH research programme.
*
* 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.
*/
/*
* Altera PIO (Parallel IO) device driver
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/timeet.h>
#include <sys/timetc.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <machine/cpu.h>
#include <dev/altera/pio/pio.h>
#include "pio_if.h"
#define READ4(_sc, _reg) bus_read_4((_sc)->res[0], _reg)
#define READ2(_sc, _reg) bus_read_2((_sc)->res[0], _reg)
#define READ1(_sc, _reg) bus_read_1((_sc)->res[0], _reg)
#define WRITE4(_sc, _reg, _val) bus_write_4((_sc)->res[0], _reg, _val)
#define WRITE2(_sc, _reg, _val) bus_write_2((_sc)->res[0], _reg, _val)
#define WRITE1(_sc, _reg, _val) bus_write_1((_sc)->res[0], _reg, _val)
struct pio_softc {
struct resource *res[2];
bus_space_tag_t bst;
bus_space_handle_t bsh;
device_t dev;
void *ih;
};
static struct resource_spec pio_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ SYS_RES_IRQ, 0, RF_ACTIVE },
{ -1, 0 }
};
static int
pio_setup_irq(device_t dev, void *intr_handler, void *ih_user)
{
struct pio_softc *sc;
sc = device_get_softc(dev);
/* Setup interrupt handlers */
if (bus_setup_intr(sc->dev, sc->res[1], INTR_TYPE_BIO | INTR_MPSAFE,
NULL, intr_handler, ih_user, &sc->ih)) {
device_printf(sc->dev, "Unable to setup intr\n");
return (1);
}
return (0);
}
static int
pio_teardown_irq(device_t dev)
{
struct pio_softc *sc;
sc = device_get_softc(dev);
bus_teardown_intr(sc->dev, sc->res[1], sc->ih);
return (0);
}
static int
pio_read(device_t dev)
{
struct pio_softc *sc;
sc = device_get_softc(dev);
return (READ4(sc, PIO_DATA));
}
static int
pio_set(device_t dev, int bit, int enable)
{
struct pio_softc *sc;
sc = device_get_softc(dev);
if (enable)
WRITE4(sc, PIO_OUTSET, bit);
else
WRITE4(sc, PIO_OUTCLR, bit);
return (0);
}
static int
pio_configure(device_t dev, int dir, int mask)
{
struct pio_softc *sc;
sc = device_get_softc(dev);
WRITE4(sc, PIO_INT_MASK, mask);
WRITE4(sc, PIO_DIR, dir);
return (0);
}
static int
pio_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "altr,pio"))
return (ENXIO);
device_set_desc(dev, "Altera PIO");
return (BUS_PROBE_DEFAULT);
}
static int
pio_attach(device_t dev)
{
struct pio_softc *sc;
struct fdt_ic *fic;
phandle_t node;
sc = device_get_softc(dev);
sc->dev = dev;
if (bus_alloc_resources(dev, pio_spec, sc->res)) {
device_printf(dev, "could not allocate resources\n");
return (ENXIO);
}
/* Memory interface */
sc->bst = rman_get_bustag(sc->res[0]);
sc->bsh = rman_get_bushandle(sc->res[0]);
if ((node = ofw_bus_get_node(sc->dev)) == -1)
return (ENXIO);
fic = malloc(sizeof(*fic), M_DEVBUF, M_WAITOK|M_ZERO);
fic->iph = node;
fic->dev = dev;
SLIST_INSERT_HEAD(&fdt_ic_list_head, fic, fdt_ics);
return (0);
}
static device_method_t pio_methods[] = {
DEVMETHOD(device_probe, pio_probe),
DEVMETHOD(device_attach, pio_attach),
/* pio_if.m */
DEVMETHOD(pio_read, pio_read),
DEVMETHOD(pio_configure, pio_configure),
DEVMETHOD(pio_set, pio_set),
DEVMETHOD(pio_setup_irq, pio_setup_irq),
DEVMETHOD(pio_teardown_irq, pio_teardown_irq),
DEVMETHOD_END
};
static driver_t pio_driver = {
"altera_pio",
pio_methods,
sizeof(struct pio_softc),
};
static devclass_t pio_devclass;
DRIVER_MODULE(altera_pio, simplebus, pio_driver, pio_devclass, 0, 0);