/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2012 Ganbold Tsagaankhuu <ganbold@freebsd.org>
 * 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.
 */

/*
 * Allwinner A10 attachment driver for the USB Enhanced Host Controller.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

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

#include <arm/allwinner/aw_machdep.h>
#include <dev/extres/clk/clk.h>
#include <dev/extres/hwreset/hwreset.h>
#include <dev/extres/phy/phy.h>

#define EHCI_HC_DEVSTR			"Allwinner Integrated USB 2.0 controller"

#define SW_SDRAM_REG_HPCR_USB1		(0x250 + ((1 << 2) * 4))
#define SW_SDRAM_REG_HPCR_USB2		(0x250 + ((1 << 2) * 5))
#define SW_SDRAM_BP_HPCR_ACCESS		(1 << 0)

#define	USB_CONF(d)			\
	(void *)ofw_bus_search_compatible((d), compat_data)->ocd_data

#define A10_READ_4(sc, reg)		\
	bus_space_read_4((sc)->sc_io_tag, (sc)->sc_io_hdl, reg)

#define A10_WRITE_4(sc, reg, data)	\
	bus_space_write_4((sc)->sc_io_tag, (sc)->sc_io_hdl, reg, data)

static device_attach_t a10_ehci_attach;
static device_detach_t a10_ehci_detach;

struct clk_list {
	TAILQ_ENTRY(clk_list)	next;
	clk_t			clk;
};

struct hwrst_list {
	TAILQ_ENTRY(hwrst_list)	next;
	hwreset_t		rst;
};

struct aw_ehci_softc {
	ehci_softc_t	sc;
	TAILQ_HEAD(, clk_list)		clk_list;
	TAILQ_HEAD(, hwrst_list)	rst_list;
	phy_t				phy;
};

struct aw_ehci_conf {
	bool		sdram_init;
};

static const struct aw_ehci_conf a10_ehci_conf = {
	.sdram_init = true,
};

static const struct aw_ehci_conf a31_ehci_conf = {
	.sdram_init = false,
};

static struct ofw_compat_data compat_data[] = {
	{ "allwinner,sun4i-a10-ehci",	(uintptr_t)&a10_ehci_conf },
	{ "allwinner,sun5i-a13-ehci",	(uintptr_t)&a10_ehci_conf },
	{ "allwinner,sun6i-a31-ehci",	(uintptr_t)&a31_ehci_conf },
	{ "allwinner,sun7i-a20-ehci",	(uintptr_t)&a10_ehci_conf },
	{ "allwinner,sun8i-a83t-ehci",	(uintptr_t)&a31_ehci_conf },
	{ "allwinner,sun8i-h3-ehci",	(uintptr_t)&a31_ehci_conf },
	{ "allwinner,sun50i-a64-ehci",	(uintptr_t)&a31_ehci_conf },
	{ NULL,				(uintptr_t)NULL }
};

static int
a10_ehci_probe(device_t self)
{

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

	if (ofw_bus_search_compatible(self, compat_data)->ocd_data == 0)
		return (ENXIO);

	device_set_desc(self, EHCI_HC_DEVSTR);

	return (BUS_PROBE_DEFAULT);
}

static int
a10_ehci_attach(device_t self)
{
	struct aw_ehci_softc *aw_sc = device_get_softc(self);
	ehci_softc_t *sc = &aw_sc->sc;
	const struct aw_ehci_conf *conf;
	bus_space_handle_t bsh;
	int err, rid, off;
	struct clk_list *clkp;
	clk_t clk;
	struct hwrst_list *rstp;
	hwreset_t rst;
	uint32_t reg_value = 0;

	conf = USB_CONF(self);

	/* initialise some bus fields */
	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;

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

	sc->sc_bus.usbrev = USB_REV_2_0;

	rid = 0;
	sc->sc_io_res = bus_alloc_resource_any(self, SYS_RES_MEMORY, &rid, RF_ACTIVE);
	if (!sc->sc_io_res) {
		device_printf(self, "Could not map memory\n");
		goto error;
	}

	sc->sc_io_tag = rman_get_bustag(sc->sc_io_res);
	sc->sc_io_hdl = rman_get_bushandle(sc->sc_io_res);
	bsh = rman_get_bushandle(sc->sc_io_res);

	sc->sc_io_size = rman_get_size(sc->sc_io_res);

	if (bus_space_subregion(sc->sc_io_tag, bsh, 0x00,
	    sc->sc_io_size, &sc->sc_io_hdl) != 0)
		panic("%s: unable to subregion USB host registers",
		    device_get_name(self));

	rid = 0;
	sc->sc_irq_res = bus_alloc_resource_any(self, SYS_RES_IRQ, &rid,
	    RF_SHAREABLE | RF_ACTIVE);
	if (sc->sc_irq_res == NULL) {
		device_printf(self, "Could not allocate irq\n");
		goto error;
	}
	sc->sc_bus.bdev = device_add_child(self, "usbus", -1);
	if (!sc->sc_bus.bdev) {
		device_printf(self, "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, "Allwinner");

	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;
		goto error;
	}

	sc->sc_flags |= EHCI_SCFLG_DONTRESET;

	/* Enable clock for USB */
	TAILQ_INIT(&aw_sc->clk_list);
	for (off = 0; clk_get_by_ofw_index(self, 0, off, &clk) == 0; off++) {
		err = clk_enable(clk);
		if (err != 0) {
			device_printf(self, "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(&aw_sc->clk_list, clkp, next);
	}

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

	/* Enable USB PHY */
	if (phy_get_by_ofw_name(self, 0, "usb", &aw_sc->phy) == 0) {
		err = phy_enable(aw_sc->phy);
		if (err != 0) {
			device_printf(self, "Could not enable phy\n");
			goto error;
		}
	}

	/* Configure port */
	if (conf->sdram_init) {
		reg_value = A10_READ_4(sc, SW_SDRAM_REG_HPCR_USB2);
		reg_value |= SW_SDRAM_BP_HPCR_ACCESS;
		A10_WRITE_4(sc, SW_SDRAM_REG_HPCR_USB2, reg_value);
	}

	err = ehci_init(sc);
	if (!err) {
		err = device_probe_and_attach(sc->sc_bus.bdev);
	}
	if (err) {
		device_printf(self, "USB init failed err=%d\n", err);
		goto error;
	}
	return (0);

error:
	a10_ehci_detach(self);
	return (ENXIO);
}

static int
a10_ehci_detach(device_t self)
{
	struct aw_ehci_softc *aw_sc = device_get_softc(self);
	ehci_softc_t *sc = &aw_sc->sc;
	const struct aw_ehci_conf *conf;
	int err;
	uint32_t reg_value = 0;
	struct clk_list *clk, *clk_tmp;
	struct hwrst_list *rst, *rst_tmp;

	conf = USB_CONF(self);

	/* during module unload there are lots of children leftover */
	device_delete_children(self);

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

		err = bus_teardown_intr(self, sc->sc_irq_res, sc->sc_intr_hdl);

		if (err)
			/* XXX or should we panic? */
			device_printf(self, "Could not tear down irq, %d\n",
			    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;
	}
	usb_bus_mem_free_all(&sc->sc_bus, &ehci_iterate_hw_softc);

	/* Disable configure port */
	if (conf->sdram_init) {
		reg_value = A10_READ_4(sc, SW_SDRAM_REG_HPCR_USB2);
		reg_value &= ~SW_SDRAM_BP_HPCR_ACCESS;
		A10_WRITE_4(sc, SW_SDRAM_REG_HPCR_USB2, reg_value);
	}

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

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

	return (0);
}

static device_method_t ehci_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe, a10_ehci_probe),
	DEVMETHOD(device_attach, a10_ehci_attach),
	DEVMETHOD(device_detach, a10_ehci_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(struct aw_ehci_softc),
};

static devclass_t ehci_devclass;

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