/*-
 * Copyright (c) 2016 Emmanuel Vadot <manu@freebsd.org> All rights reserved.
 * Copyright (c) 2006 M. Warner Losh <imp@FreeBSD.org>
 *
 * 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.
 */

/*
 * Generic OHCI driver based on AT91 OHCI
 */

#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 <machine/bus.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/ohci.h>
#include <dev/usb/controller/ohcireg.h>

#include <dev/clk/clk.h>
#include <dev/hwreset/hwreset.h>
#include <dev/phy/phy.h>
#include <dev/phy/phy_usb.h>

#include "generic_usb_if.h"

struct clk_list {
        TAILQ_ENTRY(clk_list)   next;
        clk_t                   clk;
};
struct phy_list {
        TAILQ_ENTRY(phy_list)   next;
        phy_t                   phy;
};
struct hwrst_list {
        TAILQ_ENTRY(hwrst_list) next;
        hwreset_t               rst;
};

struct generic_ohci_softc {
        ohci_softc_t    ohci_sc;

        TAILQ_HEAD(, clk_list)          clk_list;
        TAILQ_HEAD(, phy_list)          phy_list;
        TAILQ_HEAD(, hwrst_list)        rst_list;
};

static int generic_ohci_detach(device_t);

static int
generic_ohci_probe(device_t dev)
{

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

        if (!ofw_bus_is_compatible(dev, "generic-ohci"))
                return (ENXIO);

        device_set_desc(dev, "Generic OHCI Controller");

        return (BUS_PROBE_DEFAULT);
}

static int
generic_ohci_attach(device_t dev)
{
        struct generic_ohci_softc *sc = device_get_softc(dev);
        int err, rid;
        int off;
        struct clk_list *clkp;
        struct phy_list *phyp;
        struct hwrst_list *rstp;
        clk_t clk;
        phy_t phy;
        hwreset_t rst;

        sc->ohci_sc.sc_bus.parent = dev;
        sc->ohci_sc.sc_bus.devices = sc->ohci_sc.sc_devices;
        sc->ohci_sc.sc_bus.devices_max = OHCI_MAX_DEVICES;
        sc->ohci_sc.sc_bus.dma_bits = 32;

        /* get all DMA memory */
        if (usb_bus_mem_alloc_all(&sc->ohci_sc.sc_bus,
            USB_GET_DMA_TAG(dev), &ohci_iterate_hw_softc)) {
                return (ENOMEM);
        }

        rid = 0;
        sc->ohci_sc.sc_io_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
            &rid, RF_ACTIVE);
        if (sc->ohci_sc.sc_io_res == 0) {
                err = ENOMEM;
                goto error;
        }

        sc->ohci_sc.sc_io_tag = rman_get_bustag(sc->ohci_sc.sc_io_res);
        sc->ohci_sc.sc_io_hdl = rman_get_bushandle(sc->ohci_sc.sc_io_res);
        sc->ohci_sc.sc_io_size = rman_get_size(sc->ohci_sc.sc_io_res);

        rid = 0;
        sc->ohci_sc.sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
            RF_ACTIVE);
        if (sc->ohci_sc.sc_irq_res == 0) {
                err = ENXIO;
                goto error;
        }
        sc->ohci_sc.sc_bus.bdev = device_add_child(dev, "usbus", DEVICE_UNIT_ANY);
        if (sc->ohci_sc.sc_bus.bdev == 0) {
                err = ENXIO;
                goto error;
        }
        device_set_ivars(sc->ohci_sc.sc_bus.bdev, &sc->ohci_sc.sc_bus);

        strlcpy(sc->ohci_sc.sc_vendor, "Generic",
            sizeof(sc->ohci_sc.sc_vendor));

        err = bus_setup_intr(dev, sc->ohci_sc.sc_irq_res,
            INTR_TYPE_BIO | INTR_MPSAFE, NULL,
            (driver_intr_t *)ohci_interrupt, sc, &sc->ohci_sc.sc_intr_hdl);
        if (err) {
                sc->ohci_sc.sc_intr_hdl = NULL;
                goto error;
        }

        TAILQ_INIT(&sc->clk_list);
        /* Enable clock */
        for (off = 0; clk_get_by_ofw_index(dev, 0, off, &clk) == 0; off++) {
                err = clk_enable(clk);
                if (err != 0) {
                        device_printf(dev, "Could not enable clock %s\n",
                            clk_get_name(clk));
                        goto error;
                }
                clkp = malloc(sizeof(*clkp), M_DEVBUF, M_WAITOK | M_ZERO);
                clkp->clk = clk;
                TAILQ_INSERT_TAIL(&sc->clk_list, clkp, next);
        }

        /* De-assert reset */
        TAILQ_INIT(&sc->rst_list);
        for (off = 0; hwreset_get_by_ofw_idx(dev, 0, off, &rst) == 0; off++) {
                err = hwreset_deassert(rst);
                if (err != 0) {
                        device_printf(dev, "Could not de-assert reset\n");
                        goto error;
                }
                rstp = malloc(sizeof(*rstp), M_DEVBUF, M_WAITOK | M_ZERO);
                rstp->rst = rst;
                TAILQ_INSERT_TAIL(&sc->rst_list, rstp, next);
        }

        /* Enable phy */
        TAILQ_INIT(&sc->phy_list);
        for (off = 0; phy_get_by_ofw_idx(dev, 0, off, &phy) == 0; off++) {
                err = phy_usb_set_mode(phy, PHY_USB_MODE_HOST);
                if (err != 0) {
                        device_printf(dev, "Could not set phy to host mode\n");
                        goto error;
                }
                err = phy_enable(phy);
                if (err != 0) {
                        device_printf(dev, "Could not enable phy\n");
                        goto error;
                }
                phyp = malloc(sizeof(*phyp), M_DEVBUF, M_WAITOK | M_ZERO);
                phyp->phy = phy;
                TAILQ_INSERT_TAIL(&sc->phy_list, phyp, next);
        }

        if (GENERIC_USB_INIT(dev) != 0) {
                err = ENXIO;
                goto error;
        }

        err = ohci_init(&sc->ohci_sc);
        if (err == 0)
                err = device_probe_and_attach(sc->ohci_sc.sc_bus.bdev);
        if (err)
                goto error;

        return (0);
error:
        generic_ohci_detach(dev);
        return (err);
}

static int
generic_ohci_detach(device_t dev)
{
        struct generic_ohci_softc *sc = device_get_softc(dev);
        int err;
        struct clk_list *clk, *clk_tmp;
        struct phy_list *phy, *phy_tmp;
        struct hwrst_list *rst, *rst_tmp;

        /* during module unload there are lots of children leftover */
        err = bus_generic_detach(dev);
        if (err != 0)
                return (err);

        /*
         * Put the controller into reset, then disable clocks and do
         * the MI tear down.  We have to disable the clocks/hardware
         * after we do the rest of the teardown.  We also disable the
         * clocks in the opposite order we acquire them, but that
         * doesn't seem to be absolutely necessary.  We free up the
         * clocks after we disable them, so the system could, in
         * theory, reuse them.
         */
        bus_space_write_4(sc->ohci_sc.sc_io_tag, sc->ohci_sc.sc_io_hdl,
            OHCI_CONTROL, 0);

        if (sc->ohci_sc.sc_irq_res && sc->ohci_sc.sc_intr_hdl) {
                /*
                 * only call ohci_detach() after ohci_init()
                 */
                ohci_detach(&sc->ohci_sc);

                err = bus_teardown_intr(dev, sc->ohci_sc.sc_irq_res,
                    sc->ohci_sc.sc_intr_hdl);
                sc->ohci_sc.sc_intr_hdl = NULL;
        }
        if (sc->ohci_sc.sc_irq_res) {
                bus_release_resource(dev, SYS_RES_IRQ, 0,
                    sc->ohci_sc.sc_irq_res);
                sc->ohci_sc.sc_irq_res = NULL;
        }
        if (sc->ohci_sc.sc_io_res) {
                bus_release_resource(dev, SYS_RES_MEMORY, 0,
                    sc->ohci_sc.sc_io_res);
                sc->ohci_sc.sc_io_res = NULL;
        }
        usb_bus_mem_free_all(&sc->ohci_sc.sc_bus, &ohci_iterate_hw_softc);

        /* Disable phy */
        TAILQ_FOREACH_SAFE(phy, &sc->phy_list, next, phy_tmp) {
                err = phy_disable(phy->phy);
                if (err != 0)
                        device_printf(dev, "Could not disable phy\n");
                phy_release(phy->phy);
                TAILQ_REMOVE(&sc->phy_list, phy, next);
                free(phy, M_DEVBUF);
        }

        /* Assert reset */
        TAILQ_FOREACH_SAFE(rst, &sc->rst_list, next, rst_tmp) {
                hwreset_assert(rst->rst);
                hwreset_release(rst->rst);
                TAILQ_REMOVE(&sc->rst_list, rst, next);
                free(rst, M_DEVBUF);
        }

        /* Disable clock */
        TAILQ_FOREACH_SAFE(clk, &sc->clk_list, next, clk_tmp) {
                err = clk_disable(clk->clk);
                if (err != 0)
                        device_printf(dev, "Could not disable clock %s\n",
                            clk_get_name(clk->clk));
                err = clk_release(clk->clk);
                if (err != 0)
                        device_printf(dev, "Could not release clock %s\n",
                            clk_get_name(clk->clk));
                TAILQ_REMOVE(&sc->clk_list, clk, next);
                free(clk, M_DEVBUF);
        }

        if (GENERIC_USB_DEINIT(dev) != 0)
                return (ENXIO);

        return (0);
}

static device_method_t generic_ohci_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe, generic_ohci_probe),
        DEVMETHOD(device_attach, generic_ohci_attach),
        DEVMETHOD(device_detach, generic_ohci_detach),

        DEVMETHOD(device_suspend, bus_generic_suspend),
        DEVMETHOD(device_resume, bus_generic_resume),
        DEVMETHOD(device_shutdown, bus_generic_shutdown),

        DEVMETHOD_END
};

driver_t generic_ohci_driver = {
        .name = "ohci",
        .methods = generic_ohci_methods,
        .size = sizeof(struct generic_ohci_softc),
};

DRIVER_MODULE(ohci, simplebus, generic_ohci_driver, 0, 0);
MODULE_DEPEND(ohci, usb, 1, 1, 1);