#include <common.h>
#include <console.h>
#include <dm.h>
#include <malloc.h>
#include <watchdog.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>

#include <usb.h>
#include "linux-compat.h"
#include "usb-compat.h"
#include "musb_core.h"
#include "musb_host.h"
#include "musb_gadget.h"
#include "musb_uboot.h"

#ifdef CONFIG_USB_MUSB_HOST
struct int_queue {
	struct usb_host_endpoint hep;
	struct urb urb;
};

#if !CONFIG_IS_ENABLED(DM_USB)
struct musb_host_data musb_host;
#endif

static void musb_host_complete_urb(struct urb *urb)
{
	urb->dev->status &= ~USB_ST_NOT_PROC;
	urb->dev->act_len = urb->actual_length;
}

static void construct_urb(struct urb *urb, struct usb_host_endpoint *hep,
			  struct usb_device *dev, int endpoint_type,
			  unsigned long pipe, void *buffer, int len,
			  struct devrequest *setup, int interval)
{
	int epnum = usb_pipeendpoint(pipe);
	int is_in = usb_pipein(pipe);

	memset(urb, 0, sizeof(struct urb));
	memset(hep, 0, sizeof(struct usb_host_endpoint));
	INIT_LIST_HEAD(&hep->urb_list);
	INIT_LIST_HEAD(&urb->urb_list);
	urb->ep = hep;
	urb->complete = musb_host_complete_urb;
	urb->status = -EINPROGRESS;
	urb->dev = dev;
	urb->pipe = pipe;
	urb->transfer_buffer = buffer;
	urb->transfer_dma = (unsigned long)buffer;
	urb->transfer_buffer_length = len;
	urb->setup_packet = (unsigned char *)setup;

	urb->ep->desc.wMaxPacketSize =
		__cpu_to_le16(is_in ? dev->epmaxpacketin[epnum] :
				dev->epmaxpacketout[epnum]);
	urb->ep->desc.bmAttributes = endpoint_type;
	urb->ep->desc.bEndpointAddress =
		(is_in ? USB_DIR_IN : USB_DIR_OUT) | epnum;
	urb->ep->desc.bInterval = interval;
}

static int submit_urb(struct usb_hcd *hcd, struct urb *urb)
{
	struct musb *host = hcd->hcd_priv;
	int ret;
	unsigned long timeout;

	ret = musb_urb_enqueue(hcd, urb, 0);
	if (ret < 0) {
		printf("Failed to enqueue URB to controller\n");
		return ret;
	}

	timeout = get_timer(0) + USB_TIMEOUT_MS(urb->pipe);
	do {
		if (ctrlc())
			return -EIO;
		host->isr(0, host);
	} while (urb->status == -EINPROGRESS &&
		 get_timer(0) < timeout);

	if (urb->status == -EINPROGRESS)
		musb_urb_dequeue(hcd, urb, -ETIME);

	return urb->status;
}

static int _musb_submit_control_msg(struct musb_host_data *host,
	struct usb_device *dev, unsigned long pipe,
	void *buffer, int len, struct devrequest *setup)
{
	construct_urb(&host->urb, &host->hep, dev, USB_ENDPOINT_XFER_CONTROL,
		      pipe, buffer, len, setup, 0);

	/* Fix speed for non hub-attached devices */
	if (!usb_dev_get_parent(dev))
		dev->speed = host->host_speed;

	return submit_urb(&host->hcd, &host->urb);
}

static int _musb_submit_bulk_msg(struct musb_host_data *host,
	struct usb_device *dev, unsigned long pipe, void *buffer, int len)
{
	construct_urb(&host->urb, &host->hep, dev, USB_ENDPOINT_XFER_BULK,
		      pipe, buffer, len, NULL, 0);
	return submit_urb(&host->hcd, &host->urb);
}

static int _musb_submit_int_msg(struct musb_host_data *host,
	struct usb_device *dev, unsigned long pipe,
	void *buffer, int len, int interval, bool nonblock)
{
	construct_urb(&host->urb, &host->hep, dev, USB_ENDPOINT_XFER_INT, pipe,
		      buffer, len, NULL, interval);
	return submit_urb(&host->hcd, &host->urb);
}

static struct int_queue *_musb_create_int_queue(struct musb_host_data *host,
	struct usb_device *dev, unsigned long pipe, int queuesize,
	int elementsize, void *buffer, int interval)
{
	struct int_queue *queue;
	int ret, index = usb_pipein(pipe) * 16 + usb_pipeendpoint(pipe);

	if (queuesize != 1) {
		printf("ERROR musb int-queues only support queuesize 1\n");
		return NULL;
	}

	if (dev->int_pending & (1 << index)) {
		printf("ERROR int-urb is already pending on pipe %lx\n", pipe);
		return NULL;
	}

	queue = malloc(sizeof(*queue));
	if (!queue)
		return NULL;

	construct_urb(&queue->urb, &queue->hep, dev, USB_ENDPOINT_XFER_INT,
		      pipe, buffer, elementsize, NULL, interval);

	ret = musb_urb_enqueue(&host->hcd, &queue->urb, 0);
	if (ret < 0) {
		printf("Failed to enqueue URB to controller\n");
		free(queue);
		return NULL;
	}

	dev->int_pending |= 1 << index;
	return queue;
}

static int _musb_destroy_int_queue(struct musb_host_data *host,
	struct usb_device *dev, struct int_queue *queue)
{
	int index = usb_pipein(queue->urb.pipe) * 16 + 
		    usb_pipeendpoint(queue->urb.pipe);

	if (queue->urb.status == -EINPROGRESS)
		musb_urb_dequeue(&host->hcd, &queue->urb, -ETIME);

	dev->int_pending &= ~(1 << index);
	free(queue);
	return 0;
}

static void *_musb_poll_int_queue(struct musb_host_data *host,
	struct usb_device *dev, struct int_queue *queue)
{
	if (queue->urb.status != -EINPROGRESS)
		return NULL; /* URB has already completed in a prev. poll */

	host->host->isr(0, host->host);

	if (queue->urb.status != -EINPROGRESS)
		return queue->urb.transfer_buffer; /* Done */

	return NULL; /* URB still pending */
}

static int _musb_reset_root_port(struct musb_host_data *host,
	struct usb_device *dev)
{
	void *mbase = host->host->mregs;
	u8 power;

	power = musb_readb(mbase, MUSB_POWER);
	power &= 0xf0;
	musb_writeb(mbase, MUSB_POWER, MUSB_POWER_RESET | power);
	mdelay(50);

	if (host->host->ops->pre_root_reset_end)
		host->host->ops->pre_root_reset_end(host->host);

	power = musb_readb(mbase, MUSB_POWER);
	musb_writeb(mbase, MUSB_POWER, ~MUSB_POWER_RESET & power);

	if (host->host->ops->post_root_reset_end)
		host->host->ops->post_root_reset_end(host->host);

	host->host->isr(0, host->host);
	host->host_speed = (musb_readb(mbase, MUSB_POWER) & MUSB_POWER_HSMODE) ?
			USB_SPEED_HIGH :
			(musb_readb(mbase, MUSB_DEVCTL) & MUSB_DEVCTL_FSDEV) ?
			USB_SPEED_FULL : USB_SPEED_LOW;
	mdelay((host->host_speed == USB_SPEED_LOW) ? 200 : 50);

	return 0;
}

int musb_lowlevel_init(struct musb_host_data *host)
{
	void *mbase;
	/* USB spec says it may take up to 1 second for a device to connect */
	unsigned long timeout = get_timer(0) + 1000;
	int ret;

	if (!host->host) {
		printf("MUSB host is not registered\n");
		return -ENODEV;
	}

	ret = musb_start(host->host);
	if (ret)
		return ret;

	mbase = host->host->mregs;
	do {
		if (musb_readb(mbase, MUSB_DEVCTL) & MUSB_DEVCTL_HM)
			break;
	} while (get_timer(0) < timeout);
	if (get_timer(0) >= timeout) {
		musb_stop(host->host);
		return -ENODEV;
	}

	_musb_reset_root_port(host, NULL);
	host->host->is_active = 1;
	host->hcd.hcd_priv = host->host;

	return 0;
}

#if !CONFIG_IS_ENABLED(DM_USB)
int usb_lowlevel_stop(int index)
{
	if (!musb_host.host) {
		printf("MUSB host is not registered\n");
		return -ENODEV;
	}

	musb_stop(musb_host.host);
	return 0;
}

int submit_bulk_msg(struct usb_device *dev, unsigned long pipe,
			    void *buffer, int length)
{
	return _musb_submit_bulk_msg(&musb_host, dev, pipe, buffer, length);
}

int submit_control_msg(struct usb_device *dev, unsigned long pipe,
		       void *buffer, int length, struct devrequest *setup)
{
	return _musb_submit_control_msg(&musb_host, dev, pipe, buffer, length, setup);
}

int submit_int_msg(struct usb_device *dev, unsigned long pipe,
		   void *buffer, int length, int interval, bool nonblock)
{
	return _musb_submit_int_msg(&musb_host, dev, pipe, buffer, length,
				    interval, nonblock);
}

struct int_queue *create_int_queue(struct usb_device *dev,
		unsigned long pipe, int queuesize, int elementsize,
		void *buffer, int interval)
{
	return _musb_create_int_queue(&musb_host, dev, pipe, queuesize, elementsize,
				      buffer, interval);
}

void *poll_int_queue(struct usb_device *dev, struct int_queue *queue)
{
	return _musb_poll_int_queue(&musb_host, dev, queue);
}

int destroy_int_queue(struct usb_device *dev, struct int_queue *queue)
{
	return _musb_destroy_int_queue(&musb_host, dev, queue);
}

int usb_reset_root_port(struct usb_device *dev)
{
	return _musb_reset_root_port(&musb_host, dev);
}

int usb_lowlevel_init(int index, enum usb_init_type init, void **controller)
{
	return musb_lowlevel_init(&musb_host);
}
#endif /* !CONFIG_IS_ENABLED(DM_USB) */

#if CONFIG_IS_ENABLED(DM_USB)
static int musb_submit_control_msg(struct udevice *dev, struct usb_device *udev,
				   unsigned long pipe, void *buffer, int length,
				   struct devrequest *setup)
{
	struct musb_host_data *host = dev_get_priv(dev);
	return _musb_submit_control_msg(host, udev, pipe, buffer, length, setup);
}

static int musb_submit_bulk_msg(struct udevice *dev, struct usb_device *udev,
				unsigned long pipe, void *buffer, int length)
{
	struct musb_host_data *host = dev_get_priv(dev);
	return _musb_submit_bulk_msg(host, udev, pipe, buffer, length);
}

static int musb_submit_int_msg(struct udevice *dev, struct usb_device *udev,
			       unsigned long pipe, void *buffer, int length,
			       int interval, bool nonblock)
{
	struct musb_host_data *host = dev_get_priv(dev);
	return _musb_submit_int_msg(host, udev, pipe, buffer, length, interval,
				    nonblock);
}

static struct int_queue *musb_create_int_queue(struct udevice *dev,
		struct usb_device *udev, unsigned long pipe, int queuesize,
		int elementsize, void *buffer, int interval)
{
	struct musb_host_data *host = dev_get_priv(dev);
	return _musb_create_int_queue(host, udev, pipe, queuesize, elementsize,
				      buffer, interval);
}

static void *musb_poll_int_queue(struct udevice *dev, struct usb_device *udev,
				 struct int_queue *queue)
{
	struct musb_host_data *host = dev_get_priv(dev);
	return _musb_poll_int_queue(host, udev, queue);
}

static int musb_destroy_int_queue(struct udevice *dev, struct usb_device *udev,
				  struct int_queue *queue)
{
	struct musb_host_data *host = dev_get_priv(dev);
	return _musb_destroy_int_queue(host, udev, queue);
}

static int musb_reset_root_port(struct udevice *dev, struct usb_device *udev)
{
	struct musb_host_data *host = dev_get_priv(dev);
	return _musb_reset_root_port(host, udev);
}

struct dm_usb_ops musb_usb_ops = {
	.control = musb_submit_control_msg,
	.bulk = musb_submit_bulk_msg,
	.interrupt = musb_submit_int_msg,
	.create_int_queue = musb_create_int_queue,
	.poll_int_queue = musb_poll_int_queue,
	.destroy_int_queue = musb_destroy_int_queue,
	.reset_root_port = musb_reset_root_port,
};
#endif /* CONFIG_IS_ENABLED(DM_USB) */
#endif /* CONFIG_USB_MUSB_HOST */

#if defined(CONFIG_USB_MUSB_GADGET) && !CONFIG_IS_ENABLED(DM_USB_GADGET)
static struct musb *gadget;

int usb_gadget_handle_interrupts(int index)
{
	WATCHDOG_RESET();
	if (!gadget || !gadget->isr)
		return -EINVAL;

	return gadget->isr(0, gadget);
}

int usb_gadget_register_driver(struct usb_gadget_driver *driver)
{
	int ret;

	if (!driver || driver->speed < USB_SPEED_FULL || !driver->bind ||
	    !driver->setup) {
		printf("bad parameter.\n");
		return -EINVAL;
	}

	if (!gadget) {
		printf("Controller uninitialized\n");
		return -ENXIO;
	}

	ret = musb_gadget_start(&gadget->g, driver);
	if (ret < 0) {
		printf("gadget_start failed with %d\n", ret);
		return ret;
	}

	ret = driver->bind(&gadget->g);
	if (ret < 0) {
		printf("bind failed with %d\n", ret);
		return ret;
	}

	return 0;
}

int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
{
	if (driver->disconnect)
		driver->disconnect(&gadget->g);
	if (driver->unbind)
		driver->unbind(&gadget->g);
	return 0;
}
#endif /* CONFIG_USB_MUSB_GADGET */

struct musb *musb_register(struct musb_hdrc_platform_data *plat, void *bdata,
			   void *ctl_regs)
{
	struct musb **musbp;

	switch (plat->mode) {
#if defined(CONFIG_USB_MUSB_HOST) && !CONFIG_IS_ENABLED(DM_USB)
	case MUSB_HOST:
		musbp = &musb_host.host;
		break;
#endif
#if defined(CONFIG_USB_MUSB_GADGET) && !CONFIG_IS_ENABLED(DM_USB_GADGET)
	case MUSB_PERIPHERAL:
		musbp = &gadget;
		break;
#endif
	default:
		return ERR_PTR(-EINVAL);
	}

	*musbp = musb_init_controller(plat, (struct device *)bdata, ctl_regs);
	if (IS_ERR(*musbp)) {
		printf("Failed to init the controller\n");
		return ERR_CAST(*musbp);
	}

	return *musbp;
}

#if CONFIG_IS_ENABLED(DM_USB)
struct usb_device *usb_dev_get_parent(struct usb_device *udev)
{
	struct udevice *parent = udev->dev->parent;

	/*
	 * When called from usb-uclass.c: usb_scan_device() udev->dev points
	 * to the parent udevice, not the actual udevice belonging to the
	 * udev as the device is not instantiated yet.
	 *
	 * If dev is an usb-bus, then we are called from usb_scan_device() for
	 * an usb-device plugged directly into the root port, return NULL.
	 */
	if (device_get_uclass_id(udev->dev) == UCLASS_USB)
		return NULL;

	/*
	 * If these 2 are not the same we are being called from
	 * usb_scan_device() and udev itself is the parent.
	 */
	if (dev_get_parent_priv(udev->dev) != udev)
		return udev;

	/* We are being called normally, use the parent pointer */
	if (device_get_uclass_id(parent) == UCLASS_USB_HUB)
		return dev_get_parent_priv(parent);

	return NULL;
}
#else
struct usb_device *usb_dev_get_parent(struct usb_device *udev)
{
	return udev->parent;
}
#endif
