/*-
 * Copyright (c) 2012, 2013 The FreeBSD Foundation
 * All rights reserved.
 *
 * This software was developed by Oleksandr Rybalko 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: stable/10/sys/arm/freescale/imx/tzic.c 266152 2014-05-15 16:11:06Z ian $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/cpuset.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <machine/bus.h>
#include <machine/intr.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 <arm/freescale/imx/imx51_tzicreg.h>

struct tzic_softc {
	struct resource *	tzic_res[3];
	bus_space_tag_t		tzic_bst;
	bus_space_handle_t	tzic_bsh;
	uint8_t			ver;
};

static struct resource_spec tzic_spec[] = {
	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
	{ -1, 0 }
};

static struct tzic_softc *tzic_sc = NULL;

#define	tzic_read_4(reg)		\
    bus_space_read_4(tzic_sc->tzic_bst, tzic_sc->tzic_bsh, reg)
#define	tzic_write_4(reg, val)		\
    bus_space_write_4(tzic_sc->tzic_bst, tzic_sc->tzic_bsh, reg, val)

static void tzic_post_filter(void *);

static int
tzic_probe(device_t dev)
{

	if (!ofw_bus_status_okay(dev))
		return (ENXIO);

	if (ofw_bus_is_compatible(dev, "fsl,tzic")) {
		device_set_desc(dev, "TrustZone Interrupt Controller");
		return (BUS_PROBE_DEFAULT);
	}
	return (ENXIO);
}

static int
tzic_attach(device_t dev)
{
	struct		tzic_softc *sc = device_get_softc(dev);
	int		i;
	uint32_t	reg;

	if (tzic_sc)
		return (ENXIO);

	if (bus_alloc_resources(dev, tzic_spec, sc->tzic_res)) {
		device_printf(dev, "could not allocate resources\n");
		return (ENXIO);
	}

	arm_post_filter = tzic_post_filter;

	/* Distributor Interface */
	sc->tzic_bst = rman_get_bustag(sc->tzic_res[0]);
	sc->tzic_bsh = rman_get_bushandle(sc->tzic_res[0]);

	tzic_sc = sc;

	reg = tzic_read_4(TZIC_INTCNTL);
	tzic_write_4(TZIC_INTCNTL, INTCNTL_NSEN_MASK|INTCNTL_NSEN|INTCNTL_EN);
	reg = tzic_read_4(TZIC_INTCNTL);
	tzic_write_4(TZIC_PRIOMASK, 0x1f);
	reg = tzic_read_4(TZIC_PRIOMASK);

	tzic_write_4(TZIC_SYNCCTRL, 0x02);
	reg = tzic_read_4(TZIC_SYNCCTRL);

	/* route all interrupts to IRQ.  secure interrupts are for FIQ */
	for (i = 0; i < 4; i++)
		tzic_write_4(TZIC_INTSEC(i), 0xffffffff);

	/* disable all interrupts */
	for (i = 0; i < 4; i++)
		tzic_write_4(TZIC_ENCLEAR(i), 0xffffffff);

	return (0);
}

static device_method_t tzic_methods[] = {
	DEVMETHOD(device_probe,		tzic_probe),
	DEVMETHOD(device_attach,	tzic_attach),
	{ 0, 0 }
};

static driver_t tzic_driver = {
	"tzic",
	tzic_methods,
	sizeof(struct tzic_softc),
};

static devclass_t tzic_devclass;

/*
 * Memory space of controller located outside of device range, so let him to
 * attach not only to simplebus, but nexus also.
 */
EARLY_DRIVER_MODULE(tzic, nexus, tzic_driver, tzic_devclass, 0, 0,
    BUS_PASS_INTERRUPT);
EARLY_DRIVER_MODULE(tzic, simplebus, tzic_driver, tzic_devclass, 0, 0,
    BUS_PASS_INTERRUPT);

static void
tzic_post_filter(void *arg)
{

}

int
arm_get_next_irq(int last_irq)
{
	uint32_t pending;
	int i, b;

	for (i = 0; i < 4; i++) {
		pending = tzic_read_4(TZIC_PND(i));
		for (b = 0; pending != 0 && b < 32; b++)
			if (pending & (1 << b)) {
				return (i * 32 + b);
			}
	}

	return (-1);
}

void
arm_mask_irq(uintptr_t nb)
{

	tzic_write_4(TZIC_ENCLEAR(nb / 32), (1UL <<(nb % 32)));
}

void
arm_unmask_irq(uintptr_t nb)
{

	tzic_write_4(TZIC_ENSET(nb / 32), (1UL <<(nb % 32)));
}