/*-
 * 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 <sys/gpio.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 "gpio_if.h"

#include "a10_clk.h"

#define EHCI_HC_DEVSTR			"Allwinner Integrated USB 2.0 controller"

#define SW_USB_PMU_IRQ_ENABLE		0x800

#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 SW_ULPI_BYPASS			(1 << 0)
#define SW_AHB_INCRX_ALIGN		(1 << 8)
#define SW_AHB_INCR4			(1 << 9)
#define SW_AHB_INCR8			(1 << 10)
#define GPIO_USB1_PWR			230
#define GPIO_USB2_PWR			227

#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;

bs_r_1_proto(reversed);
bs_w_1_proto(reversed);

static int
a10_ehci_probe(device_t self)
{

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

	if (!ofw_bus_is_compatible(self, "allwinner,usb-ehci")) 
		return (ENXIO);

	device_set_desc(self, EHCI_HC_DEVSTR);

	return (BUS_PROBE_DEFAULT);
}

static int
a10_ehci_attach(device_t self)
{
	ehci_softc_t *sc = device_get_softc(self);
	bus_space_handle_t bsh;
	device_t sc_gpio_dev;
	int err;
	int rid;
	uint32_t reg_value = 0;

	/* 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");

        /* Get the GPIO device, we need this to give power to USB */
	sc_gpio_dev = devclass_get_device(devclass_find("gpio"), 0);
	if (sc_gpio_dev == NULL) {
		device_printf(self, "Error: failed to get the GPIO device\n");
		goto error;
	}

	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 */
	a10_clk_usb_activate();

	/* Give power to USB */
	GPIO_PIN_SETFLAGS(sc_gpio_dev, GPIO_USB2_PWR, GPIO_PIN_OUTPUT);
	GPIO_PIN_SET(sc_gpio_dev, GPIO_USB2_PWR, GPIO_PIN_HIGH);

	/* Give power to USB */
	GPIO_PIN_SETFLAGS(sc_gpio_dev, GPIO_USB1_PWR, GPIO_PIN_OUTPUT);
	GPIO_PIN_SET(sc_gpio_dev, GPIO_USB1_PWR, GPIO_PIN_HIGH);

	/* Enable passby */
	reg_value = A10_READ_4(sc, SW_USB_PMU_IRQ_ENABLE);
	reg_value |= SW_AHB_INCR8; /* AHB INCR8 enable */
	reg_value |= SW_AHB_INCR4; /* AHB burst type INCR4 enable */
	reg_value |= SW_AHB_INCRX_ALIGN; /* AHB INCRX align enable */
	reg_value |= SW_ULPI_BYPASS; /* ULPI bypass enable */
	A10_WRITE_4(sc, SW_USB_PMU_IRQ_ENABLE, reg_value);

	/* Configure port */
	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)
{
	ehci_softc_t *sc = device_get_softc(self);
	device_t bdev;
	int err;
	uint32_t reg_value = 0;

	if (sc->sc_bus.bdev) {
		bdev = sc->sc_bus.bdev;
		device_detach(bdev);
		device_delete_child(self, bdev);
	}
	/* 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 */
	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 passby */
	reg_value = A10_READ_4(sc, SW_USB_PMU_IRQ_ENABLE);
	reg_value &= ~SW_AHB_INCR8; /* AHB INCR8 disable */
	reg_value &= ~SW_AHB_INCR4; /* AHB burst type INCR4 disable */
	reg_value &= ~SW_AHB_INCRX_ALIGN; /* AHB INCRX align disable */
	reg_value &= ~SW_ULPI_BYPASS; /* ULPI bypass disable */
	A10_WRITE_4(sc, SW_USB_PMU_IRQ_ENABLE, reg_value);

	/* Disable clock for USB */
	a10_clk_usb_deactivate();

	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(ehci_softc_t),
};

static devclass_t ehci_devclass;

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