/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2018 Ruslan Bukin <br@bsdpad.com>
 * All rights reserved.
 *
 * This software was developed by BAE Systems, the University of Cambridge
 * Computer Laboratory, and Memorial University under DARPA/AFRL contract
 * FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent Computing
 * (TC) research program.
 *
 * 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>
#include "opt_bus.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/condvar.h>
#include <sys/kernel.h>
#include <sys/module.h>

#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>

#include <dev/usb/usb_core.h>
#include <dev/usb/usb_busdma.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/usb_util.h>

#include <dev/usb/usb_controller.h>
#include <dev/usb/usb_bus.h>
#include <dev/usb/controller/ehci.h>
#include <dev/usb/controller/ehcireg.h>

struct ehci_msm_softc {
	ehci_softc_t		base;
	struct resource		*res[3];
};

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

#define	EHCI_HC_DEVSTR		"Qualcomm USB 2.0 controller"

static device_attach_t ehci_msm_attach;
static device_detach_t ehci_msm_detach;

static int
ehci_msm_probe(device_t dev)
{

	if (!ofw_bus_is_compatible(dev, "qcom,ci-hdrc"))
		return (ENXIO);

	device_set_desc(dev, EHCI_HC_DEVSTR);

	return (BUS_PROBE_DEFAULT);
}

static int
ehci_msm_attach(device_t dev)
{
	struct ehci_msm_softc *esc;
	bus_space_handle_t bsh;
	ehci_softc_t *sc;
	int err;

	esc = device_get_softc(dev);
	sc = &esc->base;
	sc->sc_bus.parent = dev;
	sc->sc_bus.devices = sc->sc_devices;
	sc->sc_bus.devices_max = EHCI_MAX_DEVICES;
	sc->sc_bus.dma_bits = 32;

	if (bus_alloc_resources(dev, ehci_msm_spec, esc->res)) {
		device_printf(dev, "could not allocate resources\n");
		return (ENXIO);
	}

	sc->sc_io_tag = rman_get_bustag(esc->res[0]);

	/* Get all DMA memory */
	if (usb_bus_mem_alloc_all(&sc->sc_bus,
	    USB_GET_DMA_TAG(dev), &ehci_iterate_hw_softc)) {
		return (ENOMEM);
	}

	/* EHCI registers */
	sc->sc_io_tag = rman_get_bustag(esc->res[0]);
	bsh = rman_get_bushandle(esc->res[0]);
	sc->sc_io_size = rman_get_size(esc->res[0]);

	if (bus_space_subregion(sc->sc_io_tag, bsh, 0x100,
	    sc->sc_io_size, &sc->sc_io_hdl) != 0)
		panic("%s: unable to subregion USB host registers",
		    device_get_name(dev));

	sc->sc_bus.bdev = device_add_child(dev, "usbus", DEVICE_UNIT_ANY);
	if (!sc->sc_bus.bdev) {
		device_printf(dev, "Could not add USB device\n");
		goto error;
	}
	device_set_ivars(sc->sc_bus.bdev, &sc->sc_bus);
	device_set_desc(sc->sc_bus.bdev, EHCI_HC_DEVSTR);

	sprintf(sc->sc_vendor, "Qualcomm");

	err = bus_setup_intr(dev, esc->res[2], INTR_TYPE_BIO | INTR_MPSAFE,
	    NULL, (driver_intr_t *)ehci_interrupt, sc, &sc->sc_intr_hdl);
	if (err) {
		device_printf(dev, "Could not setup irq, %d\n", err);
		sc->sc_intr_hdl = NULL;
		goto error;
	}

	sc->sc_flags |= EHCI_SCFLG_DONTRESET | EHCI_SCFLG_NORESTERM;

	err = ehci_init(sc);
	if (!err) {
		sc->sc_flags |= EHCI_SCFLG_DONEINIT;
		err = device_probe_and_attach(sc->sc_bus.bdev);
	}

	if (err) {
		device_printf(dev, "USB init failed err=%d\n", err);
		goto error;
	}
	return (0);

error:
	ehci_msm_detach(dev);
	return (ENXIO);
}

static int
ehci_msm_detach(device_t dev)
{
	ehci_softc_t *sc;
	device_t bdev;
	int err;

	sc = device_get_softc(dev);

	if (sc->sc_bus.bdev) {
		bdev = sc->sc_bus.bdev;
		device_detach(bdev);
		device_delete_child(dev, bdev);
	}

	device_delete_children(dev);

	if (sc->sc_irq_res && sc->sc_intr_hdl) {
		/* only call ehci_detach() after ehci_init() */
		ehci_detach(sc);

		err = bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intr_hdl);
		if (err)
			device_printf(dev, "Could not tear down irq, %d\n",
			    err);
		sc->sc_intr_hdl = NULL;
	}

	if (sc->sc_irq_res) {
		bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res);
		sc->sc_irq_res = NULL;
	}
	if (sc->sc_io_res) {
		bus_release_resource(dev, SYS_RES_MEMORY, 0,
		    sc->sc_io_res);
		sc->sc_io_res = NULL;
	}

	usb_bus_mem_free_all(&sc->sc_bus, &ehci_iterate_hw_softc);

	return (0);
}

static device_method_t ehci_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		ehci_msm_probe),
	DEVMETHOD(device_attach,	ehci_msm_attach),
	DEVMETHOD(device_detach,	ehci_msm_detach),
	DEVMETHOD(device_suspend,	bus_generic_suspend),
	DEVMETHOD(device_resume,	bus_generic_resume),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD_END
};

static driver_t ehci_driver = {
	.name = "ehci",
	.methods = ehci_methods,
	.size = sizeof(ehci_softc_t),
};

DRIVER_MODULE(ehci_msm, simplebus, ehci_driver, 0, 0);
MODULE_DEPEND(ehci_msm, usb, 1, 1, 1);