/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2010-2012 Semihalf
 * All rights reserved.
 *
 * 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 "opt_bus.h"

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

#include <machine/bus.h>
#include <machine/clock.h>
#include <machine/resource.h>

#include <powerpc/include/tlb.h>

#include "opt_platform.h"

/*
 * Register the driver
 */
/* Forward declarations */
static int      fsl_ehci_attach(device_t self);
static int      fsl_ehci_detach(device_t self);
static int      fsl_ehci_probe(device_t self);

static device_method_t ehci_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe, fsl_ehci_probe),
        DEVMETHOD(device_attach, fsl_ehci_attach),
        DEVMETHOD(device_detach, fsl_ehci_detach),
        DEVMETHOD(device_suspend, bus_generic_suspend),
        DEVMETHOD(device_resume, bus_generic_resume),
        DEVMETHOD(device_shutdown, bus_generic_shutdown),

        /* Bus interface */
        DEVMETHOD(bus_print_child, bus_generic_print_child),
        DEVMETHOD_END
};

/* kobj_class definition */
static driver_t ehci_driver = {
        "ehci",
        ehci_methods,
        sizeof(struct ehci_softc)
};

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

/*
 * Private defines
 */
#define FSL_EHCI_REG_OFF        0x100
#define FSL_EHCI_REG_SIZE       0x300

/*
 * Internal interface registers' offsets.
 * Offsets from 0x000 ehci dev space, big-endian access.
 */
enum internal_reg {
        SNOOP1          = 0x400,
        SNOOP2          = 0x404,
        AGE_CNT_THRESH  = 0x408,
        SI_CTRL         = 0x410,
        CONTROL         = 0x500
};

/* CONTROL register bit flags */
enum control_flags {
        USB_EN          = 0x00000004,
        UTMI_PHY_EN     = 0x00000200,
        ULPI_INT_EN     = 0x00000001
};

/* SI_CTRL register bit flags */
enum si_ctrl_flags {
        FETCH_32        = 1,
        FETCH_64        = 0
};

#define SNOOP_RANGE_2GB 0x1E

/*
 * Operational registers' offsets.
 * Offsets from USBCMD register, little-endian access.
 */
enum special_op_reg {
        USBMODE         = 0x0A8,
        PORTSC          = 0x084,
        ULPI_VIEWPORT   = 0x70
};

/* USBMODE register bit flags */
enum usbmode_flags {
        HOST_MODE       = 0x3,
        DEVICE_MODE     = 0x2
};

#define PORT_POWER_MASK 0x00001000

/*
 * Private methods
 */

static void
set_to_host_mode(ehci_softc_t *sc)
{
        int tmp;

        tmp = bus_space_read_4(sc->sc_io_tag, sc->sc_io_hdl, USBMODE);
        bus_space_write_4(sc->sc_io_tag, sc->sc_io_hdl, USBMODE, tmp | HOST_MODE);
}

static void
enable_usb(device_t dev, bus_space_tag_t iot, bus_space_handle_t ioh)
{
        int tmp;
        phandle_t node;
        char *phy_type;

        phy_type = NULL;
        tmp = bus_space_read_4(iot, ioh, CONTROL) | USB_EN;

        node = ofw_bus_get_node(dev);
        if ((node != 0) &&
            (OF_getprop_alloc(node, "phy_type", (void **)&phy_type) > 0)) {
                if (strncasecmp(phy_type, "utmi", strlen("utmi")) == 0)
                        tmp |= UTMI_PHY_EN;
                OF_prop_free(phy_type);
        }
        bus_space_write_4(iot, ioh, CONTROL, tmp);
}

static void
set_32b_prefetch(bus_space_tag_t iot, bus_space_handle_t ioh)
{

        bus_space_write_4(iot, ioh, SI_CTRL, FETCH_32);
}

static void
set_snooping(bus_space_tag_t iot, bus_space_handle_t ioh)
{

        bus_space_write_4(iot, ioh, SNOOP1, SNOOP_RANGE_2GB);
        bus_space_write_4(iot, ioh, SNOOP2, 0x80000000 | SNOOP_RANGE_2GB);
}

static void
clear_port_power(ehci_softc_t *sc)
{
        int tmp;

        tmp = bus_space_read_4(sc->sc_io_tag, sc->sc_io_hdl, PORTSC);
        bus_space_write_4(sc->sc_io_tag, sc->sc_io_hdl, PORTSC, tmp & ~PORT_POWER_MASK);
}

/*
 * Public methods
 */
static int
fsl_ehci_probe(device_t dev)
{

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

        if (((ofw_bus_is_compatible(dev, "fsl-usb2-dr")) == 0) &&
            ((ofw_bus_is_compatible(dev, "fsl-usb2-mph")) == 0))
                return (ENXIO);

        device_set_desc(dev, "Freescale integrated EHCI controller");

        return (BUS_PROBE_DEFAULT);
}

static int
fsl_ehci_attach(device_t self)
{
        ehci_softc_t *sc;
        int rid;
        int err;
        bus_space_handle_t ioh;
        bus_space_tag_t iot;

        sc = device_get_softc(self);
        rid = 0;

        sc->sc_bus.parent = self;
        sc->sc_bus.devices = sc->sc_devices;
        sc->sc_bus.devices_max = EHCI_MAX_DEVICES;
        sc->sc_bus.dma_bits = 32;

        if (usb_bus_mem_alloc_all(&sc->sc_bus,
            USB_GET_DMA_TAG(self), &ehci_iterate_hw_softc))
                return (ENOMEM);

        /* Allocate io resource for EHCI */
        sc->sc_io_res = bus_alloc_resource_any(self, SYS_RES_MEMORY, &rid,
            RF_ACTIVE);
        if (sc->sc_io_res == NULL) {
                err = fsl_ehci_detach(self);
                if (err) {
                        device_printf(self,
                            "Detach of the driver failed with error %d\n",
                            err);
                }
                return (ENXIO);
        }
        iot = rman_get_bustag(sc->sc_io_res);

        /*
         * Set handle to USB related registers subregion used by generic
         * EHCI driver
         */
        ioh = rman_get_bushandle(sc->sc_io_res);

        err = bus_space_subregion(iot, ioh, FSL_EHCI_REG_OFF, FSL_EHCI_REG_SIZE,
            &sc->sc_io_hdl);
        if (err != 0) {
                err = fsl_ehci_detach(self);
                if (err) {
                        device_printf(self,
                            "Detach of the driver failed with error %d\n",
                            err);
                }
                return (ENXIO);
        }

        /* Set little-endian tag for use by the generic EHCI driver */
        sc->sc_io_tag = &bs_le_tag;

        /* Allocate irq */
        sc->sc_irq_res = bus_alloc_resource_any(self, SYS_RES_IRQ, &rid,
            RF_ACTIVE);
        if (sc->sc_irq_res == NULL) {
                err = fsl_ehci_detach(self);
                if (err) {
                        device_printf(self,
                            "Detach of the driver failed with error %d\n",
                            err);
                }
                return (ENXIO);
        }

        /* Setup interrupt handler */
        err = bus_setup_intr(self, sc->sc_irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
            NULL, (driver_intr_t *)ehci_interrupt, sc, &sc->sc_intr_hdl);
        if (err) {
                device_printf(self, "Could not setup irq, %d\n", err);
                sc->sc_intr_hdl = NULL;
                err = fsl_ehci_detach(self);
                if (err) {
                        device_printf(self,
                            "Detach of the driver failed with error %d\n",
                            err);
                }
                return (ENXIO);
        }

        /* Add USB device */
        sc->sc_bus.bdev = device_add_child(self, "usbus", DEVICE_UNIT_ANY);
        if (!sc->sc_bus.bdev) {
                device_printf(self, "Could not add USB device\n");
                err = fsl_ehci_detach(self);
                if (err) {
                        device_printf(self,
                            "Detach of the driver failed with error %d\n",
                            err);
                }
                return (ENOMEM);
        }
        device_set_ivars(sc->sc_bus.bdev, &sc->sc_bus);

        sc->sc_id_vendor = 0x1234;
        strlcpy(sc->sc_vendor, "Freescale", sizeof(sc->sc_vendor));

        /* Enable USB */
        err = ehci_reset(sc);
        if (err) {
                device_printf(self, "Could not reset the controller\n");
                err = fsl_ehci_detach(self);
                if (err) {
                        device_printf(self,
                            "Detach of the driver failed with error %d\n",
                            err);
                }
                return (ENXIO);
        }

        enable_usb(self, iot, ioh);
        set_snooping(iot, ioh);
        set_to_host_mode(sc);
        set_32b_prefetch(iot, ioh);

        /*
         * If usb subsystem is enabled in U-Boot, port power has to be turned
         * off to allow proper discovery of devices during boot up.
         */
        clear_port_power(sc);

        /* Set flags */
        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(self, "USB init failed err=%d\n", err);
                err = fsl_ehci_detach(self);
                if (err) {
                        device_printf(self,
                            "Detach of the driver failed with error %d\n",
                            err);
                }
                return (EIO);
        }

        return (0);
}

static int
fsl_ehci_detach(device_t self)
{
        int err;
        ehci_softc_t *sc;

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

        sc = device_get_softc(self);
        /*
         * only call ehci_detach() after ehci_init()
         */
        if (sc->sc_flags & EHCI_SCFLG_DONEINIT) {
                ehci_detach(sc);
                sc->sc_flags &= ~EHCI_SCFLG_DONEINIT;
        }

        /* Disable interrupts that might have been switched on in ehci_init */
        if (sc->sc_io_tag && sc->sc_io_hdl)
                bus_space_write_4(sc->sc_io_tag, sc->sc_io_hdl, EHCI_USBINTR, 0);

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

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

        if (sc->sc_io_res) {
                bus_release_resource(self, SYS_RES_MEMORY, 0, sc->sc_io_res);
                sc->sc_io_res = NULL;
                sc->sc_io_tag = 0;
                sc->sc_io_hdl = 0;
        }

        return (0);
}