/*      $NetBSD: bcm2835_dwctwo.c,v 1.12 2021/08/07 16:18:43 thorpej Exp $      */

/*-
 * Copyright (c) 2013 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Nick Hudson
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: bcm2835_dwctwo.c,v 1.12 2021/08/07 16:18:43 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/mutex.h>
#include <sys/bus.h>
#include <sys/workqueue.h>

#include <arm/broadcom/bcm2835reg.h>

#include <dev/fdt/fdtvar.h>

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

#include <dwc2/dwc2var.h>

#include <dwc2/dwc2.h>
#include "dwc2_core.h"

struct bcmdwc2_softc {
        struct dwc2_softc       sc_dwc2;

        void                    *sc_ih;
        int                     sc_phandle;
};

static struct dwc2_core_params bcmdwc2_params = {
        .otg_cap                        = 0,    /* HNP/SRP capable */
        .otg_ver                        = 0,    /* 1.3 */
        .dma_enable                     = 1,
        .dma_desc_enable                = 0,
        .speed                          = 0,    /* High Speed */
        .enable_dynamic_fifo            = 1,
        .en_multiple_tx_fifo            = 1,
        .host_rx_fifo_size              = 774,  /* 774 DWORDs */
        .host_nperio_tx_fifo_size       = 256,  /* 256 DWORDs */
        .host_perio_tx_fifo_size        = 512,  /* 512 DWORDs */
        .max_transfer_size              = 65535,
        .max_packet_count               = 511,
        .host_channels                  = 8,
        .phy_type                       = 1,    /* UTMI */
        .phy_utmi_width                 = 8,    /* 8 bits */
        .phy_ulpi_ddr                   = 0,    /* Single */
        .phy_ulpi_ext_vbus              = 0,
        .i2c_enable                     = 0,
        .ulpi_fs_ls                     = 0,
        .host_support_fs_ls_low_power   = 0,
        .host_ls_low_power_phy_clk      = 0,    /* 48 MHz */
        .ts_dline                       = 0,
        .reload_ctl                     = 0,
        .ahbcfg                         = 0x10,
        .uframe_sched                   = 1,
        .external_id_pin_ctl            = -1,
        .hibernation                    = -1,
};

static int bcmdwc2_match(device_t, struct cfdata *, void *);
static void bcmdwc2_attach(device_t, device_t, void *);
static void bcmdwc2_deferred(device_t);

CFATTACH_DECL_NEW(bcmdwctwo, sizeof(struct bcmdwc2_softc),
    bcmdwc2_match, bcmdwc2_attach, NULL, NULL);

static const struct device_compatible_entry compat_data[] = {
        { .compat = "brcm,bcm2708-usb" },
        { .compat = "brcm,bcm2835-usb" },
        DEVICE_COMPAT_EOL
};

/* ARGSUSED */
static int
bcmdwc2_match(device_t parent, struct cfdata *match, void *aux)
{
        struct fdt_attach_args * const faa = aux;

        return of_compatible_match(faa->faa_phandle, compat_data);
}

/* ARGSUSED */
static void
bcmdwc2_attach(device_t parent, device_t self, void *aux)
{
        struct bcmdwc2_softc *sc = device_private(self);
        struct fdt_attach_args * const faa = aux;
        const int phandle = faa->faa_phandle;
        bus_addr_t addr;
        bus_size_t size;
        int error;

        aprint_naive(": USB controller\n");
        aprint_normal(": USB controller\n");

        if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
                aprint_error(": couldn't get registers\n");
                return;
        }

        sc->sc_phandle = phandle;
        sc->sc_dwc2.sc_dev = self;
        sc->sc_dwc2.sc_iot = faa->faa_bst;
        sc->sc_dwc2.sc_bus.ub_dmatag = faa->faa_dmat;
        sc->sc_dwc2.sc_params = &bcmdwc2_params;

        error = bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_dwc2.sc_ioh);
        if (error) {
                aprint_error(": couldn't map device\n");
                return;
        }

        char intrstr[128];
        if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
                aprint_error(": failed to decode interrupt\n");
                return;
        }

        sc->sc_ih = fdtbus_intr_establish_xname(phandle, 0, IPL_VM, FDT_INTR_MPSAFE,
            dwc2_intr, &sc->sc_dwc2, device_xname(self));

        if (sc->sc_ih == NULL) {
                aprint_error_dev(self, "failed to establish interrupt %s\n",
                    intrstr);
                goto fail;
        }
        aprint_normal_dev(self, "interrupting on %s\n", intrstr);
        config_interrupts(self, bcmdwc2_deferred);

        return;

fail:
        if (sc->sc_ih) {
                fdtbus_intr_disestablish(sc->sc_phandle, sc->sc_ih);
                sc->sc_ih = NULL;
        }
        bus_space_unmap(sc->sc_dwc2.sc_iot, sc->sc_dwc2.sc_ioh, size);
}

static void
bcmdwc2_deferred(device_t self)
{
        struct bcmdwc2_softc *sc = device_private(self);
        int error;

        error = dwc2_init(&sc->sc_dwc2);
        if (error != 0) {
                aprint_error_dev(self, "couldn't initialize host, error=%d\n",
                    error);
                return;
        }
        sc->sc_dwc2.sc_child = config_found(sc->sc_dwc2.sc_dev,
            &sc->sc_dwc2.sc_bus, usbctlprint, CFARGS_NONE);
}