[mirror_ubuntu-jammy-kernel.git] / drivers / usb / mtu3 / mtu3_gadget.c

// SPDX-License-Identifier: GPL-2.0
/*
 * mtu3_gadget.c - MediaTek usb3 DRD peripheral support
 *
 * Copyright (C) 2016 MediaTek Inc.
 *
 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
 */

#include "mtu3.h"
#include "mtu3_trace.h"

void mtu3_req_complete(struct mtu3_ep *mep,
		     struct usb_request *req, int status)
__releases(mep->mtu->lock)
__acquires(mep->mtu->lock)
{
	struct mtu3_request *mreq = to_mtu3_request(req);
	struct mtu3 *mtu = mreq->mtu;

	list_del(&mreq->list);
	if (req->status == -EINPROGRESS)
		req->status = status;

	trace_mtu3_req_complete(mreq);
	spin_unlock(&mtu->lock);

	/* ep0 makes use of PIO, needn't unmap it */
	if (mep->epnum)
		usb_gadget_unmap_request(&mtu->g, req, mep->is_in);

	dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n",
		mep->name, req, req->status, req->actual, req->length);

	usb_gadget_giveback_request(&mep->ep, req);
	spin_lock(&mtu->lock);
}

static void nuke(struct mtu3_ep *mep, const int status)
{
	struct mtu3_request *mreq = NULL;

	if (list_empty(&mep->req_list))
		return;

	dev_dbg(mep->mtu->dev, "abort %s's req: sts %d\n", mep->name, status);

	/* exclude EP0 */
	if (mep->epnum)
		mtu3_qmu_flush(mep);

	while (!list_empty(&mep->req_list)) {
		mreq = list_first_entry(&mep->req_list,
					struct mtu3_request, list);
		mtu3_req_complete(mep, &mreq->request, status);
	}
}

static int mtu3_ep_enable(struct mtu3_ep *mep)
{
	const struct usb_endpoint_descriptor *desc;
	const struct usb_ss_ep_comp_descriptor *comp_desc;
	struct mtu3 *mtu = mep->mtu;
	u32 interval = 0;
	u32 mult = 0;
	u32 burst = 0;
	int ret;

	desc = mep->desc;
	comp_desc = mep->comp_desc;
	mep->type = usb_endpoint_type(desc);
	mep->maxp = usb_endpoint_maxp(desc);

	switch (mtu->g.speed) {
	case USB_SPEED_SUPER:
	case USB_SPEED_SUPER_PLUS:
		if (usb_endpoint_xfer_int(desc) ||
				usb_endpoint_xfer_isoc(desc)) {
			interval = desc->bInterval;
			interval = clamp_val(interval, 1, 16);
			if (usb_endpoint_xfer_isoc(desc) && comp_desc)
				mult = comp_desc->bmAttributes;
		}
		if (comp_desc)
			burst = comp_desc->bMaxBurst;

		break;
	case USB_SPEED_HIGH:
		if (usb_endpoint_xfer_isoc(desc) ||
				usb_endpoint_xfer_int(desc)) {
			interval = desc->bInterval;
			interval = clamp_val(interval, 1, 16);
			mult = usb_endpoint_maxp_mult(desc) - 1;
		}
		break;
	case USB_SPEED_FULL:
		if (usb_endpoint_xfer_isoc(desc))
			interval = clamp_val(desc->bInterval, 1, 16);
		else if (usb_endpoint_xfer_int(desc))
			interval = clamp_val(desc->bInterval, 1, 255);

		break;
	default:
		break; /*others are ignored */
	}

	dev_dbg(mtu->dev, "%s maxp:%d, interval:%d, burst:%d, mult:%d\n",
		__func__, mep->maxp, interval, burst, mult);

	mep->ep.maxpacket = mep->maxp;
	mep->ep.desc = desc;
	mep->ep.comp_desc = comp_desc;

	/* slot mainly affects bulk/isoc transfer, so ignore int */
	mep->slot = usb_endpoint_xfer_int(desc) ? 0 : mtu->slot;

	ret = mtu3_config_ep(mtu, mep, interval, burst, mult);
	if (ret < 0)
		return ret;

	ret = mtu3_gpd_ring_alloc(mep);
	if (ret < 0) {
		mtu3_deconfig_ep(mtu, mep);
		return ret;
	}

	mtu3_qmu_start(mep);

	return 0;
}

static int mtu3_ep_disable(struct mtu3_ep *mep)
{
	struct mtu3 *mtu = mep->mtu;

	mtu3_qmu_stop(mep);

	/* abort all pending requests */
	nuke(mep, -ESHUTDOWN);
	mtu3_deconfig_ep(mtu, mep);
	mtu3_gpd_ring_free(mep);

	mep->desc = NULL;
	mep->ep.desc = NULL;
	mep->comp_desc = NULL;
	mep->type = 0;
	mep->flags = 0;

	return 0;
}

static int mtu3_gadget_ep_enable(struct usb_ep *ep,
		const struct usb_endpoint_descriptor *desc)
{
	struct mtu3_ep *mep;
	struct mtu3 *mtu;
	unsigned long flags;
	int ret = -EINVAL;

	if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
		pr_debug("%s invalid parameters\n", __func__);
		return -EINVAL;
	}

	if (!desc->wMaxPacketSize) {
		pr_debug("%s missing wMaxPacketSize\n", __func__);
		return -EINVAL;
	}
	mep = to_mtu3_ep(ep);
	mtu = mep->mtu;

	/* check ep number and direction against endpoint */
	if (usb_endpoint_num(desc) != mep->epnum)
		return -EINVAL;

	if (!!usb_endpoint_dir_in(desc) ^ !!mep->is_in)
		return -EINVAL;

	dev_dbg(mtu->dev, "%s %s\n", __func__, ep->name);

	if (mep->flags & MTU3_EP_ENABLED) {
		dev_WARN_ONCE(mtu->dev, true, "%s is already enabled\n",
				mep->name);
		return 0;
	}

	spin_lock_irqsave(&mtu->lock, flags);
	mep->desc = desc;
	mep->comp_desc = ep->comp_desc;

	ret = mtu3_ep_enable(mep);
	if (ret)
		goto error;

	mep->flags = MTU3_EP_ENABLED;
	mtu->active_ep++;

error:
	spin_unlock_irqrestore(&mtu->lock, flags);

	dev_dbg(mtu->dev, "%s active_ep=%d\n", __func__, mtu->active_ep);
	trace_mtu3_gadget_ep_enable(mep);

	return ret;
}

static int mtu3_gadget_ep_disable(struct usb_ep *ep)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);
	struct mtu3 *mtu = mep->mtu;
	unsigned long flags;

	dev_dbg(mtu->dev, "%s %s\n", __func__, mep->name);
	trace_mtu3_gadget_ep_disable(mep);

	if (!(mep->flags & MTU3_EP_ENABLED)) {
		dev_warn(mtu->dev, "%s is already disabled\n", mep->name);
		return 0;
	}

	spin_lock_irqsave(&mtu->lock, flags);
	mtu3_ep_disable(mep);
	mep->flags = 0;
	mtu->active_ep--;
	spin_unlock_irqrestore(&(mtu->lock), flags);

	dev_dbg(mtu->dev, "%s active_ep=%d, mtu3 is_active=%d\n",
		__func__, mtu->active_ep, mtu->is_active);

	return 0;
}

struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);
	struct mtu3_request *mreq;

	mreq = kzalloc(sizeof(*mreq), gfp_flags);
	if (!mreq)
		return NULL;

	mreq->request.dma = DMA_ADDR_INVALID;
	mreq->epnum = mep->epnum;
	mreq->mep = mep;
	INIT_LIST_HEAD(&mreq->list);
	trace_mtu3_alloc_request(mreq);

	return &mreq->request;
}

void mtu3_free_request(struct usb_ep *ep, struct usb_request *req)
{
	struct mtu3_request *mreq = to_mtu3_request(req);

	trace_mtu3_free_request(mreq);
	kfree(mreq);
}

static int mtu3_gadget_queue(struct usb_ep *ep,
		struct usb_request *req, gfp_t gfp_flags)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);
	struct mtu3_request *mreq = to_mtu3_request(req);
	struct mtu3 *mtu = mep->mtu;
	unsigned long flags;
	int ret = 0;

	if (!req->buf)
		return -ENODATA;

	if (mreq->mep != mep)
		return -EINVAL;

	dev_dbg(mtu->dev, "%s %s EP%d(%s), req=%p, maxp=%d, len#%d\n",
		__func__, mep->is_in ? "TX" : "RX", mreq->epnum, ep->name,
		mreq, ep->maxpacket, mreq->request.length);

	if (req->length > GPD_BUF_SIZE ||
	    (mtu->gen2cp && req->length > GPD_BUF_SIZE_EL)) {
		dev_warn(mtu->dev,
			"req length > supported MAX:%d requested:%d\n",
			mtu->gen2cp ? GPD_BUF_SIZE_EL : GPD_BUF_SIZE,
			req->length);
		return -EOPNOTSUPP;
	}

	/* don't queue if the ep is down */
	if (!mep->desc) {
		dev_dbg(mtu->dev, "req=%p queued to %s while it's disabled\n",
			req, ep->name);
		return -ESHUTDOWN;
	}

	mreq->mtu = mtu;
	mreq->request.actual = 0;
	mreq->request.status = -EINPROGRESS;

	ret = usb_gadget_map_request(&mtu->g, req, mep->is_in);
	if (ret) {
		dev_err(mtu->dev, "dma mapping failed\n");
		return ret;
	}

	spin_lock_irqsave(&mtu->lock, flags);

	if (mtu3_prepare_transfer(mep)) {
		ret = -EAGAIN;
		goto error;
	}

	list_add_tail(&mreq->list, &mep->req_list);
	mtu3_insert_gpd(mep, mreq);
	mtu3_qmu_resume(mep);

error:
	spin_unlock_irqrestore(&mtu->lock, flags);
	trace_mtu3_gadget_queue(mreq);

	return ret;
}

static int mtu3_gadget_dequeue(struct usb_ep *ep, struct usb_request *req)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);
	struct mtu3_request *mreq = to_mtu3_request(req);
	struct mtu3_request *r;
	struct mtu3 *mtu = mep->mtu;
	unsigned long flags;
	int ret = 0;

	if (mreq->mep != mep)
		return -EINVAL;

	dev_dbg(mtu->dev, "%s : req=%p\n", __func__, req);
	trace_mtu3_gadget_dequeue(mreq);

	spin_lock_irqsave(&mtu->lock, flags);

	list_for_each_entry(r, &mep->req_list, list) {
		if (r == mreq)
			break;
	}
	if (r != mreq) {
		dev_dbg(mtu->dev, "req=%p not queued to %s\n", req, ep->name);
		ret = -EINVAL;
		goto done;
	}

	mtu3_qmu_flush(mep);  /* REVISIT: set BPS ?? */
	mtu3_req_complete(mep, req, -ECONNRESET);
	mtu3_qmu_start(mep);

done:
	spin_unlock_irqrestore(&mtu->lock, flags);

	return ret;
}

/*
 * Set or clear the halt bit of an EP.
 * A halted EP won't TX/RX any data but will queue requests.
 */
static int mtu3_gadget_ep_set_halt(struct usb_ep *ep, int value)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);
	struct mtu3 *mtu = mep->mtu;
	struct mtu3_request *mreq;
	unsigned long flags;
	int ret = 0;

	dev_dbg(mtu->dev, "%s : %s...", __func__, ep->name);

	spin_lock_irqsave(&mtu->lock, flags);

	if (mep->type == USB_ENDPOINT_XFER_ISOC) {
		ret = -EINVAL;
		goto done;
	}

	mreq = next_request(mep);
	if (value) {
		/*
		 * If there is not request for TX-EP, QMU will not transfer
		 * data to TX-FIFO, so no need check whether TX-FIFO
		 * holds bytes or not here
		 */
		if (mreq) {
			dev_dbg(mtu->dev, "req in progress, cannot halt %s\n",
				ep->name);
			ret = -EAGAIN;
			goto done;
		}
	} else {
		mep->flags &= ~MTU3_EP_WEDGE;
	}

	dev_dbg(mtu->dev, "%s %s stall\n", ep->name, value ? "set" : "clear");

	mtu3_ep_stall_set(mep, value);

done:
	spin_unlock_irqrestore(&mtu->lock, flags);
	trace_mtu3_gadget_ep_set_halt(mep);

	return ret;
}

/* Sets the halt feature with the clear requests ignored */
static int mtu3_gadget_ep_set_wedge(struct usb_ep *ep)
{
	struct mtu3_ep *mep = to_mtu3_ep(ep);

	mep->flags |= MTU3_EP_WEDGE;

	return usb_ep_set_halt(ep);
}

static const struct usb_ep_ops mtu3_ep_ops = {
	.enable = mtu3_gadget_ep_enable,
	.disable = mtu3_gadget_ep_disable,
	.alloc_request = mtu3_alloc_request,
	.free_request = mtu3_free_request,
	.queue = mtu3_gadget_queue,
	.dequeue = mtu3_gadget_dequeue,
	.set_halt = mtu3_gadget_ep_set_halt,
	.set_wedge = mtu3_gadget_ep_set_wedge,
};

static int mtu3_gadget_get_frame(struct usb_gadget *gadget)
{
	struct mtu3 *mtu = gadget_to_mtu3(gadget);

	return (int)mtu3_readl(mtu->mac_base, U3D_USB20_FRAME_NUM);
}

static int mtu3_gadget_wakeup(struct usb_gadget *gadget)
{
	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	unsigned long flags;

	dev_dbg(mtu->dev, "%s\n", __func__);

	/* remote wakeup feature is not enabled by host */
	if (!mtu->may_wakeup)
		return  -EOPNOTSUPP;

	spin_lock_irqsave(&mtu->lock, flags);
	if (mtu->g.speed >= USB_SPEED_SUPER) {
		mtu3_setbits(mtu->mac_base, U3D_LINK_POWER_CONTROL, UX_EXIT);
	} else {
		mtu3_setbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
		spin_unlock_irqrestore(&mtu->lock, flags);
		usleep_range(10000, 11000);
		spin_lock_irqsave(&mtu->lock, flags);
		mtu3_clrbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
	}
	spin_unlock_irqrestore(&mtu->lock, flags);
	return 0;
}

static int mtu3_gadget_set_self_powered(struct usb_gadget *gadget,
		int is_selfpowered)
{
	struct mtu3 *mtu = gadget_to_mtu3(gadget);

	mtu->is_self_powered = !!is_selfpowered;
	return 0;
}

static int mtu3_gadget_pullup(struct usb_gadget *gadget, int is_on)
{
	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	unsigned long flags;

	dev_dbg(mtu->dev, "%s (%s) for %sactive device\n", __func__,
		is_on ? "on" : "off", mtu->is_active ? "" : "in");

	pm_runtime_get_sync(mtu->dev);

	/* we'd rather not pullup unless the device is active. */
	spin_lock_irqsave(&mtu->lock, flags);

	is_on = !!is_on;
	if (!mtu->is_active) {
		/* save it for mtu3_start() to process the request */
		mtu->softconnect = is_on;
	} else if (is_on != mtu->softconnect) {
		mtu->softconnect = is_on;
		mtu3_dev_on_off(mtu, is_on);
	}

	spin_unlock_irqrestore(&mtu->lock, flags);
	pm_runtime_put(mtu->dev);

	return 0;
}

static int mtu3_gadget_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
{
	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	unsigned long flags;

	if (mtu->gadget_driver) {
		dev_err(mtu->dev, "%s is already bound to %s\n",
			mtu->g.name, mtu->gadget_driver->driver.name);
		return -EBUSY;
	}

	dev_dbg(mtu->dev, "bind driver %s\n", driver->function);
	pm_runtime_get_sync(mtu->dev);

	spin_lock_irqsave(&mtu->lock, flags);

	mtu->softconnect = 0;
	mtu->gadget_driver = driver;

	if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
		mtu3_start(mtu);

	spin_unlock_irqrestore(&mtu->lock, flags);
	pm_runtime_put(mtu->dev);

	return 0;
}

static void stop_activity(struct mtu3 *mtu)
{
	struct usb_gadget_driver *driver = mtu->gadget_driver;
	int i;

	/* don't disconnect if it's not connected */
	if (mtu->g.speed == USB_SPEED_UNKNOWN)
		driver = NULL;
	else
		mtu->g.speed = USB_SPEED_UNKNOWN;

	/* deactivate the hardware */
	if (mtu->softconnect) {
		mtu->softconnect = 0;
		mtu3_dev_on_off(mtu, 0);
	}

	/*
	 * killing any outstanding requests will quiesce the driver;
	 * then report disconnect
	 */
	nuke(mtu->ep0, -ESHUTDOWN);
	for (i = 1; i < mtu->num_eps; i++) {
		nuke(mtu->in_eps + i, -ESHUTDOWN);
		nuke(mtu->out_eps + i, -ESHUTDOWN);
	}

	if (driver) {
		spin_unlock(&mtu->lock);
		driver->disconnect(&mtu->g);
		spin_lock(&mtu->lock);
	}
}

static int mtu3_gadget_stop(struct usb_gadget *g)
{
	struct mtu3 *mtu = gadget_to_mtu3(g);
	unsigned long flags;

	dev_dbg(mtu->dev, "%s\n", __func__);

	spin_lock_irqsave(&mtu->lock, flags);

	stop_activity(mtu);
	mtu->gadget_driver = NULL;

	if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
		mtu3_stop(mtu);

	spin_unlock_irqrestore(&mtu->lock, flags);

	synchronize_irq(mtu->irq);
	return 0;
}

static void
mtu3_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed)
{
	struct mtu3 *mtu = gadget_to_mtu3(g);
	unsigned long flags;

	dev_dbg(mtu->dev, "%s %s\n", __func__, usb_speed_string(speed));

	spin_lock_irqsave(&mtu->lock, flags);
	mtu->speed = speed;
	spin_unlock_irqrestore(&mtu->lock, flags);
}

static const struct usb_gadget_ops mtu3_gadget_ops = {
	.get_frame = mtu3_gadget_get_frame,
	.wakeup = mtu3_gadget_wakeup,
	.set_selfpowered = mtu3_gadget_set_self_powered,
	.pullup = mtu3_gadget_pullup,
	.udc_start = mtu3_gadget_start,
	.udc_stop = mtu3_gadget_stop,
	.udc_set_speed = mtu3_gadget_set_speed,
};

static void mtu3_state_reset(struct mtu3 *mtu)
{
	mtu->address = 0;
	mtu->ep0_state = MU3D_EP0_STATE_SETUP;
	mtu->may_wakeup = 0;
	mtu->u1_enable = 0;
	mtu->u2_enable = 0;
	mtu->delayed_status = false;
	mtu->test_mode = false;
}

static void init_hw_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
		u32 epnum, u32 is_in)
{
	mep->epnum = epnum;
	mep->mtu = mtu;
	mep->is_in = is_in;

	INIT_LIST_HEAD(&mep->req_list);

	sprintf(mep->name, "ep%d%s", epnum,
		!epnum ? "" : (is_in ? "in" : "out"));

	mep->ep.name = mep->name;
	INIT_LIST_HEAD(&mep->ep.ep_list);

	/* initialize maxpacket as SS */
	if (!epnum) {
		usb_ep_set_maxpacket_limit(&mep->ep, 512);
		mep->ep.caps.type_control = true;
		mep->ep.ops = &mtu3_ep0_ops;
		mtu->g.ep0 = &mep->ep;
	} else {
		usb_ep_set_maxpacket_limit(&mep->ep, 1024);
		mep->ep.caps.type_iso = true;
		mep->ep.caps.type_bulk = true;
		mep->ep.caps.type_int = true;
		mep->ep.ops = &mtu3_ep_ops;
		list_add_tail(&mep->ep.ep_list, &mtu->g.ep_list);
	}

	dev_dbg(mtu->dev, "%s, name=%s, maxp=%d\n", __func__, mep->ep.name,
		 mep->ep.maxpacket);

	if (!epnum) {
		mep->ep.caps.dir_in = true;
		mep->ep.caps.dir_out = true;
	} else if (is_in) {
		mep->ep.caps.dir_in = true;
	} else {
		mep->ep.caps.dir_out = true;
	}
}

static void mtu3_gadget_init_eps(struct mtu3 *mtu)
{
	u8 epnum;

	/* initialize endpoint list just once */
	INIT_LIST_HEAD(&(mtu->g.ep_list));

	dev_dbg(mtu->dev, "%s num_eps(1 for a pair of tx&rx ep)=%d\n",
		__func__, mtu->num_eps);

	init_hw_ep(mtu, mtu->ep0, 0, 0);
	for (epnum = 1; epnum < mtu->num_eps; epnum++) {
		init_hw_ep(mtu, mtu->in_eps + epnum, epnum, 1);
		init_hw_ep(mtu, mtu->out_eps + epnum, epnum, 0);
	}
}

int mtu3_gadget_setup(struct mtu3 *mtu)
{
	mtu->g.ops = &mtu3_gadget_ops;
	mtu->g.max_speed = mtu->max_speed;
	mtu->g.speed = USB_SPEED_UNKNOWN;
	mtu->g.sg_supported = 0;
	mtu->g.name = MTU3_DRIVER_NAME;
	mtu->is_active = 0;
	mtu->delayed_status = false;

	mtu3_gadget_init_eps(mtu);

	return usb_add_gadget_udc(mtu->dev, &mtu->g);
}

void mtu3_gadget_cleanup(struct mtu3 *mtu)
{
	usb_del_gadget_udc(&mtu->g);
}

void mtu3_gadget_resume(struct mtu3 *mtu)
{
	dev_dbg(mtu->dev, "gadget RESUME\n");
	if (mtu->gadget_driver && mtu->gadget_driver->resume) {
		spin_unlock(&mtu->lock);
		mtu->gadget_driver->resume(&mtu->g);
		spin_lock(&mtu->lock);
	}
}

/* called when SOF packets stop for 3+ msec or enters U3 */
void mtu3_gadget_suspend(struct mtu3 *mtu)
{
	dev_dbg(mtu->dev, "gadget SUSPEND\n");
	if (mtu->gadget_driver && mtu->gadget_driver->suspend) {
		spin_unlock(&mtu->lock);
		mtu->gadget_driver->suspend(&mtu->g);
		spin_lock(&mtu->lock);
	}
}

/* called when VBUS drops below session threshold, and in other cases */
void mtu3_gadget_disconnect(struct mtu3 *mtu)
{
	dev_dbg(mtu->dev, "gadget DISCONNECT\n");
	if (mtu->gadget_driver && mtu->gadget_driver->disconnect) {
		spin_unlock(&mtu->lock);
		mtu->gadget_driver->disconnect(&mtu->g);
		spin_lock(&mtu->lock);
	}

	mtu3_state_reset(mtu);
	usb_gadget_set_state(&mtu->g, USB_STATE_NOTATTACHED);
}

void mtu3_gadget_reset(struct mtu3 *mtu)
{
	dev_dbg(mtu->dev, "gadget RESET\n");

	/* report disconnect, if we didn't flush EP state */
	if (mtu->g.speed != USB_SPEED_UNKNOWN)
		mtu3_gadget_disconnect(mtu);
	else
		mtu3_state_reset(mtu);
}
Commit	Line	Data
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0
df2069ac CY	2	/*
	3	* mtu3_gadget.c - MediaTek usb3 DRD peripheral support
	4	*
	5	* Copyright (C) 2016 MediaTek Inc.
	6	*
	7	* Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
df2069ac CY	8	*/
	9
	10	#include "mtu3.h"
83374e03	11	#include "mtu3_trace.h"
df2069ac CY	12
	13	void mtu3_req_complete(struct mtu3_ep *mep,
	14	struct usb_request *req, int status)
	15	__releases(mep->mtu->lock)
	16	__acquires(mep->mtu->lock)
	17	{
ab4dc051 CY	18	struct mtu3_request *mreq = to_mtu3_request(req);
ab4dc051 CY	19	struct mtu3 *mtu = mreq->mtu;
df2069ac	20
df2069ac	21	list_del(&mreq->list);
ab4dc051 CY	22	if (req->status == -EINPROGRESS)
ab4dc051 CY	23	req->status = status;
df2069ac	24
83374e03	25	trace_mtu3_req_complete(mreq);
df2069ac CY	26	spin_unlock(&mtu->lock);
	27
	28	/* ep0 makes use of PIO, needn't unmap it */
	29	if (mep->epnum)
	30	usb_gadget_unmap_request(&mtu->g, req, mep->is_in);
	31
ab4dc051 CY	32	dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n",
ab4dc051 CY	33	mep->name, req, req->status, req->actual, req->length);
df2069ac	34
ab4dc051	35	usb_gadget_giveback_request(&mep->ep, req);
df2069ac	36	spin_lock(&mtu->lock);
df2069ac CY	37	}
	38
	39	static void nuke(struct mtu3_ep *mep, const int status)
	40	{
	41	struct mtu3_request *mreq = NULL;
	42
df2069ac CY	43	if (list_empty(&mep->req_list))
	44	return;
	45
	46	dev_dbg(mep->mtu->dev, "abort %s's req: sts %d\n", mep->name, status);
	47
	48	/* exclude EP0 */
	49	if (mep->epnum)
	50	mtu3_qmu_flush(mep);
	51
	52	while (!list_empty(&mep->req_list)) {
	53	mreq = list_first_entry(&mep->req_list,
	54	struct mtu3_request, list);
	55	mtu3_req_complete(mep, &mreq->request, status);
	56	}
	57	}
	58
	59	static int mtu3_ep_enable(struct mtu3_ep *mep)
	60	{
	61	const struct usb_endpoint_descriptor *desc;
a29de31b	62	const struct usb_ss_ep_comp_descriptor *comp_desc;
df2069ac CY	63	struct mtu3 *mtu = mep->mtu;
	64	u32 interval = 0;
	65	u32 mult = 0;
	66	u32 burst = 0;
df2069ac CY	67	int ret;
	68
	69	desc = mep->desc;
a29de31b	70	comp_desc = mep->comp_desc;
df2069ac	71	mep->type = usb_endpoint_type(desc);
44e4439d	72	mep->maxp = usb_endpoint_maxp(desc);
df2069ac CY	73
df2069ac CY	74	switch (mtu->g.speed) {
a29de31b	75	case USB_SPEED_SUPER:
4d79e042	76	case USB_SPEED_SUPER_PLUS:
a29de31b CY	77	if (usb_endpoint_xfer_int(desc) \|\|
	78	usb_endpoint_xfer_isoc(desc)) {
	79	interval = desc->bInterval;
981c14f3	80	interval = clamp_val(interval, 1, 16);
a29de31b CY	81	if (usb_endpoint_xfer_isoc(desc) && comp_desc)
	82	mult = comp_desc->bmAttributes;
	83	}
	84	if (comp_desc)
	85	burst = comp_desc->bMaxBurst;
	86
	87	break;
df2069ac CY	88	case USB_SPEED_HIGH:
	89	if (usb_endpoint_xfer_isoc(desc) \|\|
	90	usb_endpoint_xfer_int(desc)) {
	91	interval = desc->bInterval;
981c14f3	92	interval = clamp_val(interval, 1, 16);
44e4439d	93	mult = usb_endpoint_maxp_mult(desc) - 1;
df2069ac	94	}
c66ccd41 CY	95	break;
	96	case USB_SPEED_FULL:
	97	if (usb_endpoint_xfer_isoc(desc))
	98	interval = clamp_val(desc->bInterval, 1, 16);
	99	else if (usb_endpoint_xfer_int(desc))
	100	interval = clamp_val(desc->bInterval, 1, 255);
	101
df2069ac CY	102	break;
	103	default:
	104	break; /others are ignored /
	105	}
	106
	107	dev_dbg(mtu->dev, "%s maxp:%d, interval:%d, burst:%d, mult:%d\n",
	108	__func__, mep->maxp, interval, burst, mult);
	109
	110	mep->ep.maxpacket = mep->maxp;
	111	mep->ep.desc = desc;
a29de31b	112	mep->ep.comp_desc = comp_desc;
df2069ac CY	113
	114	/* slot mainly affects bulk/isoc transfer, so ignore int */
	115	mep->slot = usb_endpoint_xfer_int(desc) ? 0 : mtu->slot;
	116
	117	ret = mtu3_config_ep(mtu, mep, interval, burst, mult);
	118	if (ret < 0)
	119	return ret;
	120
	121	ret = mtu3_gpd_ring_alloc(mep);
	122	if (ret < 0) {
	123	mtu3_deconfig_ep(mtu, mep);
	124	return ret;
	125	}
	126
	127	mtu3_qmu_start(mep);
	128
	129	return 0;
	130	}
	131
	132	static int mtu3_ep_disable(struct mtu3_ep *mep)
	133	{
	134	struct mtu3 *mtu = mep->mtu;
	135
	136	mtu3_qmu_stop(mep);
	137
	138	/* abort all pending requests */
	139	nuke(mep, -ESHUTDOWN);
	140	mtu3_deconfig_ep(mtu, mep);
	141	mtu3_gpd_ring_free(mep);
	142
	143	mep->desc = NULL;
	144	mep->ep.desc = NULL;
a29de31b	145	mep->comp_desc = NULL;
df2069ac CY	146	mep->type = 0;
	147	mep->flags = 0;
	148
	149	return 0;
	150	}
	151
	152	static int mtu3_gadget_ep_enable(struct usb_ep *ep,
	153	const struct usb_endpoint_descriptor *desc)
	154	{
	155	struct mtu3_ep *mep;
	156	struct mtu3 *mtu;
	157	unsigned long flags;
	158	int ret = -EINVAL;
	159
	160	if (!ep \|\| !desc \|\| desc->bDescriptorType != USB_DT_ENDPOINT) {
	161	pr_debug("%s invalid parameters\n", __func__);
	162	return -EINVAL;
	163	}
	164
	165	if (!desc->wMaxPacketSize) {
	166	pr_debug("%s missing wMaxPacketSize\n", __func__);
	167	return -EINVAL;
	168	}
	169	mep = to_mtu3_ep(ep);
	170	mtu = mep->mtu;
	171
	172	/* check ep number and direction against endpoint */
	173	if (usb_endpoint_num(desc) != mep->epnum)
	174	return -EINVAL;
	175
	176	if (!!usb_endpoint_dir_in(desc) ^ !!mep->is_in)
	177	return -EINVAL;
	178
	179	dev_dbg(mtu->dev, "%s %s\n", __func__, ep->name);
	180
	181	if (mep->flags & MTU3_EP_ENABLED) {
	182	dev_WARN_ONCE(mtu->dev, true, "%s is already enabled\n",
	183	mep->name);
	184	return 0;
	185	}
	186
	187	spin_lock_irqsave(&mtu->lock, flags);
	188	mep->desc = desc;
a29de31b	189	mep->comp_desc = ep->comp_desc;
df2069ac CY	190
	191	ret = mtu3_ep_enable(mep);
	192	if (ret)
	193	goto error;
	194
54402373	195	mep->flags = MTU3_EP_ENABLED;
df2069ac CY	196	mtu->active_ep++;
	197
	198	error:
	199	spin_unlock_irqrestore(&mtu->lock, flags);
	200
	201	dev_dbg(mtu->dev, "%s active_ep=%d\n", __func__, mtu->active_ep);
83374e03	202	trace_mtu3_gadget_ep_enable(mep);
df2069ac CY	203
	204	return ret;
	205	}
	206
	207	static int mtu3_gadget_ep_disable(struct usb_ep *ep)
	208	{
	209	struct mtu3_ep *mep = to_mtu3_ep(ep);
	210	struct mtu3 *mtu = mep->mtu;
	211	unsigned long flags;
	212
	213	dev_dbg(mtu->dev, "%s %s\n", __func__, mep->name);
83374e03	214	trace_mtu3_gadget_ep_disable(mep);
df2069ac CY	215
	216	if (!(mep->flags & MTU3_EP_ENABLED)) {
	217	dev_warn(mtu->dev, "%s is already disabled\n", mep->name);
	218	return 0;
	219	}
	220
	221	spin_lock_irqsave(&mtu->lock, flags);
	222	mtu3_ep_disable(mep);
54402373	223	mep->flags = 0;
df2069ac CY	224	mtu->active_ep--;
	225	spin_unlock_irqrestore(&(mtu->lock), flags);
	226
	227	dev_dbg(mtu->dev, "%s active_ep=%d, mtu3 is_active=%d\n",
	228	__func__, mtu->active_ep, mtu->is_active);
	229
	230	return 0;
	231	}
	232
	233	struct usb_request mtu3_alloc_request(struct usb_ep ep, gfp_t gfp_flags)
	234	{
	235	struct mtu3_ep *mep = to_mtu3_ep(ep);
	236	struct mtu3_request *mreq;
	237
	238	mreq = kzalloc(sizeof(*mreq), gfp_flags);
	239	if (!mreq)
	240	return NULL;
	241
	242	mreq->request.dma = DMA_ADDR_INVALID;
	243	mreq->epnum = mep->epnum;
	244	mreq->mep = mep;
63132c0c	245	INIT_LIST_HEAD(&mreq->list);
83374e03	246	trace_mtu3_alloc_request(mreq);
df2069ac CY	247
	248	return &mreq->request;
	249	}
	250
	251	void mtu3_free_request(struct usb_ep ep, struct usb_request req)
	252	{
83374e03 CY	253	struct mtu3_request *mreq = to_mtu3_request(req);
	254
	255	trace_mtu3_free_request(mreq);
	256	kfree(mreq);
df2069ac CY	257	}
	258
	259	static int mtu3_gadget_queue(struct usb_ep *ep,
	260	struct usb_request *req, gfp_t gfp_flags)
	261	{
fde9156a CY	262	struct mtu3_ep *mep = to_mtu3_ep(ep);
	263	struct mtu3_request *mreq = to_mtu3_request(req);
	264	struct mtu3 *mtu = mep->mtu;
df2069ac CY	265	unsigned long flags;
	266	int ret = 0;
	267
df2069ac CY	268	if (!req->buf)
	269	return -ENODATA;
	270
df2069ac CY	271	if (mreq->mep != mep)
	272	return -EINVAL;
	273
	274	dev_dbg(mtu->dev, "%s %s EP%d(%s), req=%p, maxp=%d, len#%d\n",
	275	__func__, mep->is_in ? "TX" : "RX", mreq->epnum, ep->name,
	276	mreq, ep->maxpacket, mreq->request.length);
	277
48e0d373 CY	278	if (req->length > GPD_BUF_SIZE \|\|
48e0d373 CY	279	(mtu->gen2cp && req->length > GPD_BUF_SIZE_EL)) {
df2069ac CY	280	dev_warn(mtu->dev,
df2069ac CY	281	"req length > supported MAX:%d requested:%d\n",
48e0d373 CY	282	mtu->gen2cp ? GPD_BUF_SIZE_EL : GPD_BUF_SIZE,
48e0d373 CY	283	req->length);
df2069ac CY	284	return -EOPNOTSUPP;
	285	}
	286
	287	/* don't queue if the ep is down */
	288	if (!mep->desc) {
	289	dev_dbg(mtu->dev, "req=%p queued to %s while it's disabled\n",
	290	req, ep->name);
	291	return -ESHUTDOWN;
	292	}
	293
fde9156a	294	mreq->mtu = mtu;
df2069ac CY	295	mreq->request.actual = 0;
	296	mreq->request.status = -EINPROGRESS;
	297
	298	ret = usb_gadget_map_request(&mtu->g, req, mep->is_in);
	299	if (ret) {
	300	dev_err(mtu->dev, "dma mapping failed\n");
	301	return ret;
	302	}
	303
	304	spin_lock_irqsave(&mtu->lock, flags);
	305
	306	if (mtu3_prepare_transfer(mep)) {
	307	ret = -EAGAIN;
	308	goto error;
	309	}
	310
	311	list_add_tail(&mreq->list, &mep->req_list);
	312	mtu3_insert_gpd(mep, mreq);
	313	mtu3_qmu_resume(mep);
	314
	315	error:
	316	spin_unlock_irqrestore(&mtu->lock, flags);
83374e03	317	trace_mtu3_gadget_queue(mreq);
df2069ac CY	318
	319	return ret;
	320	}
	321
	322	static int mtu3_gadget_dequeue(struct usb_ep ep, struct usb_request req)
	323	{
	324	struct mtu3_ep *mep = to_mtu3_ep(ep);
	325	struct mtu3_request *mreq = to_mtu3_request(req);
	326	struct mtu3_request *r;
fde9156a	327	struct mtu3 *mtu = mep->mtu;
df2069ac CY	328	unsigned long flags;
df2069ac CY	329	int ret = 0;
df2069ac	330
fde9156a	331	if (mreq->mep != mep)
df2069ac CY	332	return -EINVAL;
	333
	334	dev_dbg(mtu->dev, "%s : req=%p\n", __func__, req);
83374e03	335	trace_mtu3_gadget_dequeue(mreq);
df2069ac CY	336
	337	spin_lock_irqsave(&mtu->lock, flags);
	338
	339	list_for_each_entry(r, &mep->req_list, list) {
	340	if (r == mreq)
	341	break;
	342	}
	343	if (r != mreq) {
	344	dev_dbg(mtu->dev, "req=%p not queued to %s\n", req, ep->name);
	345	ret = -EINVAL;
	346	goto done;
	347	}
	348
	349	mtu3_qmu_flush(mep); /* REVISIT: set BPS ?? */
	350	mtu3_req_complete(mep, req, -ECONNRESET);
	351	mtu3_qmu_start(mep);
	352
	353	done:
	354	spin_unlock_irqrestore(&mtu->lock, flags);
	355
	356	return ret;
	357	}
	358
	359	/*
	360	* Set or clear the halt bit of an EP.
	361	* A halted EP won't TX/RX any data but will queue requests.
	362	*/
	363	static int mtu3_gadget_ep_set_halt(struct usb_ep *ep, int value)
	364	{
	365	struct mtu3_ep *mep = to_mtu3_ep(ep);
	366	struct mtu3 *mtu = mep->mtu;
	367	struct mtu3_request *mreq;
	368	unsigned long flags;
	369	int ret = 0;
	370
df2069ac CY	371	dev_dbg(mtu->dev, "%s : %s...", __func__, ep->name);
	372
	373	spin_lock_irqsave(&mtu->lock, flags);
	374
	375	if (mep->type == USB_ENDPOINT_XFER_ISOC) {
	376	ret = -EINVAL;
	377	goto done;
	378	}
	379
	380	mreq = next_request(mep);
	381	if (value) {
	382	/*
	383	* If there is not request for TX-EP, QMU will not transfer
	384	* data to TX-FIFO, so no need check whether TX-FIFO
	385	* holds bytes or not here
	386	*/
	387	if (mreq) {
	388	dev_dbg(mtu->dev, "req in progress, cannot halt %s\n",
	389	ep->name);
	390	ret = -EAGAIN;
	391	goto done;
	392	}
	393	} else {
54402373	394	mep->flags &= ~MTU3_EP_WEDGE;
df2069ac CY	395	}
	396
	397	dev_dbg(mtu->dev, "%s %s stall\n", ep->name, value ? "set" : "clear");
	398
	399	mtu3_ep_stall_set(mep, value);
	400
	401	done:
	402	spin_unlock_irqrestore(&mtu->lock, flags);
83374e03	403	trace_mtu3_gadget_ep_set_halt(mep);
df2069ac CY	404
	405	return ret;
	406	}
	407
	408	/* Sets the halt feature with the clear requests ignored */
	409	static int mtu3_gadget_ep_set_wedge(struct usb_ep *ep)
	410	{
	411	struct mtu3_ep *mep = to_mtu3_ep(ep);
	412
54402373	413	mep->flags \|= MTU3_EP_WEDGE;
df2069ac CY	414
	415	return usb_ep_set_halt(ep);
	416	}
	417
	418	static const struct usb_ep_ops mtu3_ep_ops = {
	419	.enable = mtu3_gadget_ep_enable,
	420	.disable = mtu3_gadget_ep_disable,
	421	.alloc_request = mtu3_alloc_request,
	422	.free_request = mtu3_free_request,
	423	.queue = mtu3_gadget_queue,
	424	.dequeue = mtu3_gadget_dequeue,
	425	.set_halt = mtu3_gadget_ep_set_halt,
	426	.set_wedge = mtu3_gadget_ep_set_wedge,
	427	};
	428
	429	static int mtu3_gadget_get_frame(struct usb_gadget *gadget)
	430	{
	431	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	432
	433	return (int)mtu3_readl(mtu->mac_base, U3D_USB20_FRAME_NUM);
	434	}
	435
	436	static int mtu3_gadget_wakeup(struct usb_gadget *gadget)
	437	{
	438	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	439	unsigned long flags;
	440
	441	dev_dbg(mtu->dev, "%s\n", __func__);
	442
	443	/* remote wakeup feature is not enabled by host */
	444	if (!mtu->may_wakeup)
	445	return -EOPNOTSUPP;
	446
	447	spin_lock_irqsave(&mtu->lock, flags);
4d79e042	448	if (mtu->g.speed >= USB_SPEED_SUPER) {
a29de31b CY	449	mtu3_setbits(mtu->mac_base, U3D_LINK_POWER_CONTROL, UX_EXIT);
	450	} else {
	451	mtu3_setbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
	452	spin_unlock_irqrestore(&mtu->lock, flags);
	453	usleep_range(10000, 11000);
	454	spin_lock_irqsave(&mtu->lock, flags);
	455	mtu3_clrbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
	456	}
df2069ac CY	457	spin_unlock_irqrestore(&mtu->lock, flags);
	458	return 0;
	459	}
	460
	461	static int mtu3_gadget_set_self_powered(struct usb_gadget *gadget,
	462	int is_selfpowered)
	463	{
	464	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	465
	466	mtu->is_self_powered = !!is_selfpowered;
	467	return 0;
	468	}
	469
	470	static int mtu3_gadget_pullup(struct usb_gadget *gadget, int is_on)
	471	{
	472	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	473	unsigned long flags;
	474
	475	dev_dbg(mtu->dev, "%s (%s) for %sactive device\n", __func__,
	476	is_on ? "on" : "off", mtu->is_active ? "" : "in");
	477
427c6642 CY	478	pm_runtime_get_sync(mtu->dev);
427c6642 CY	479
df2069ac CY	480	/* we'd rather not pullup unless the device is active. */
	481	spin_lock_irqsave(&mtu->lock, flags);
	482
	483	is_on = !!is_on;
	484	if (!mtu->is_active) {
	485	/* save it for mtu3_start() to process the request */
	486	mtu->softconnect = is_on;
	487	} else if (is_on != mtu->softconnect) {
	488	mtu->softconnect = is_on;
a29de31b	489	mtu3_dev_on_off(mtu, is_on);
df2069ac CY	490	}
	491
	492	spin_unlock_irqrestore(&mtu->lock, flags);
427c6642	493	pm_runtime_put(mtu->dev);
df2069ac CY	494
	495	return 0;
	496	}
	497
	498	static int mtu3_gadget_start(struct usb_gadget *gadget,
	499	struct usb_gadget_driver *driver)
	500	{
	501	struct mtu3 *mtu = gadget_to_mtu3(gadget);
	502	unsigned long flags;
	503
	504	if (mtu->gadget_driver) {
	505	dev_err(mtu->dev, "%s is already bound to %s\n",
	506	mtu->g.name, mtu->gadget_driver->driver.name);
	507	return -EBUSY;
	508	}
	509
	510	dev_dbg(mtu->dev, "bind driver %s\n", driver->function);
427c6642	511	pm_runtime_get_sync(mtu->dev);
df2069ac CY	512
	513	spin_lock_irqsave(&mtu->lock, flags);
	514
	515	mtu->softconnect = 0;
	516	mtu->gadget_driver = driver;
	517
d0ed062a CY	518	if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
d0ed062a CY	519	mtu3_start(mtu);
df2069ac CY	520
df2069ac CY	521	spin_unlock_irqrestore(&mtu->lock, flags);
427c6642	522	pm_runtime_put(mtu->dev);
df2069ac CY	523
	524	return 0;
	525	}
	526
	527	static void stop_activity(struct mtu3 *mtu)
	528	{
	529	struct usb_gadget_driver *driver = mtu->gadget_driver;
	530	int i;
	531
	532	/* don't disconnect if it's not connected */
	533	if (mtu->g.speed == USB_SPEED_UNKNOWN)
	534	driver = NULL;
	535	else
	536	mtu->g.speed = USB_SPEED_UNKNOWN;
	537
	538	/* deactivate the hardware */
	539	if (mtu->softconnect) {
	540	mtu->softconnect = 0;
a29de31b	541	mtu3_dev_on_off(mtu, 0);
df2069ac CY	542	}
	543
	544	/*
	545	* killing any outstanding requests will quiesce the driver;
	546	* then report disconnect
	547	*/
	548	nuke(mtu->ep0, -ESHUTDOWN);
	549	for (i = 1; i < mtu->num_eps; i++) {
	550	nuke(mtu->in_eps + i, -ESHUTDOWN);
	551	nuke(mtu->out_eps + i, -ESHUTDOWN);
	552	}
	553
	554	if (driver) {
	555	spin_unlock(&mtu->lock);
	556	driver->disconnect(&mtu->g);
	557	spin_lock(&mtu->lock);
	558	}
	559	}
	560
	561	static int mtu3_gadget_stop(struct usb_gadget *g)
	562	{
	563	struct mtu3 *mtu = gadget_to_mtu3(g);
	564	unsigned long flags;
	565
	566	dev_dbg(mtu->dev, "%s\n", __func__);
	567
	568	spin_lock_irqsave(&mtu->lock, flags);
	569
	570	stop_activity(mtu);
	571	mtu->gadget_driver = NULL;
	572
d0ed062a CY	573	if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
d0ed062a CY	574	mtu3_stop(mtu);
df2069ac CY	575
	576	spin_unlock_irqrestore(&mtu->lock, flags);
	577
20914919	578	synchronize_irq(mtu->irq);
df2069ac CY	579	return 0;
	580	}
	581
dc4c1aa7 CY	582	static void
	583	mtu3_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed)
	584	{
	585	struct mtu3 *mtu = gadget_to_mtu3(g);
	586	unsigned long flags;
	587
	588	dev_dbg(mtu->dev, "%s %s\n", __func__, usb_speed_string(speed));
	589
	590	spin_lock_irqsave(&mtu->lock, flags);
2c09bdaa	591	mtu->speed = speed;
dc4c1aa7 CY	592	spin_unlock_irqrestore(&mtu->lock, flags);
	593	}
	594
df2069ac CY	595	static const struct usb_gadget_ops mtu3_gadget_ops = {
	596	.get_frame = mtu3_gadget_get_frame,
	597	.wakeup = mtu3_gadget_wakeup,
	598	.set_selfpowered = mtu3_gadget_set_self_powered,
	599	.pullup = mtu3_gadget_pullup,
	600	.udc_start = mtu3_gadget_start,
	601	.udc_stop = mtu3_gadget_stop,
dc4c1aa7	602	.udc_set_speed = mtu3_gadget_set_speed,
df2069ac CY	603	};
df2069ac CY	604
0eae4958 CY	605	static void mtu3_state_reset(struct mtu3 *mtu)
	606	{
	607	mtu->address = 0;
	608	mtu->ep0_state = MU3D_EP0_STATE_SETUP;
	609	mtu->may_wakeup = 0;
	610	mtu->u1_enable = 0;
	611	mtu->u2_enable = 0;
	612	mtu->delayed_status = false;
	613	mtu->test_mode = false;
	614	}
	615
df2069ac CY	616	static void init_hw_ep(struct mtu3 mtu, struct mtu3_ep mep,
	617	u32 epnum, u32 is_in)
	618	{
	619	mep->epnum = epnum;
	620	mep->mtu = mtu;
	621	mep->is_in = is_in;
	622
	623	INIT_LIST_HEAD(&mep->req_list);
	624
	625	sprintf(mep->name, "ep%d%s", epnum,
	626	!epnum ? "" : (is_in ? "in" : "out"));
	627
	628	mep->ep.name = mep->name;
	629	INIT_LIST_HEAD(&mep->ep.ep_list);
	630
a29de31b	631	/* initialize maxpacket as SS */
df2069ac	632	if (!epnum) {
a29de31b	633	usb_ep_set_maxpacket_limit(&mep->ep, 512);
df2069ac CY	634	mep->ep.caps.type_control = true;
	635	mep->ep.ops = &mtu3_ep0_ops;
	636	mtu->g.ep0 = &mep->ep;
	637	} else {
a29de31b	638	usb_ep_set_maxpacket_limit(&mep->ep, 1024);
df2069ac CY	639	mep->ep.caps.type_iso = true;
	640	mep->ep.caps.type_bulk = true;
	641	mep->ep.caps.type_int = true;
	642	mep->ep.ops = &mtu3_ep_ops;
	643	list_add_tail(&mep->ep.ep_list, &mtu->g.ep_list);
	644	}
	645
	646	dev_dbg(mtu->dev, "%s, name=%s, maxp=%d\n", __func__, mep->ep.name,
	647	mep->ep.maxpacket);
	648
	649	if (!epnum) {
	650	mep->ep.caps.dir_in = true;
	651	mep->ep.caps.dir_out = true;
	652	} else if (is_in) {
	653	mep->ep.caps.dir_in = true;
	654	} else {
	655	mep->ep.caps.dir_out = true;
	656	}
	657	}
	658
	659	static void mtu3_gadget_init_eps(struct mtu3 *mtu)
	660	{
	661	u8 epnum;
	662
	663	/* initialize endpoint list just once */
	664	INIT_LIST_HEAD(&(mtu->g.ep_list));
	665
	666	dev_dbg(mtu->dev, "%s num_eps(1 for a pair of tx&rx ep)=%d\n",
	667	__func__, mtu->num_eps);
	668
	669	init_hw_ep(mtu, mtu->ep0, 0, 0);
	670	for (epnum = 1; epnum < mtu->num_eps; epnum++) {
	671	init_hw_ep(mtu, mtu->in_eps + epnum, epnum, 1);
	672	init_hw_ep(mtu, mtu->out_eps + epnum, epnum, 0);
	673	}
	674	}
	675
	676	int mtu3_gadget_setup(struct mtu3 *mtu)
	677	{
df2069ac	678	mtu->g.ops = &mtu3_gadget_ops;
a29de31b	679	mtu->g.max_speed = mtu->max_speed;
df2069ac CY	680	mtu->g.speed = USB_SPEED_UNKNOWN;
	681	mtu->g.sg_supported = 0;
	682	mtu->g.name = MTU3_DRIVER_NAME;
	683	mtu->is_active = 0;
fe7c994a	684	mtu->delayed_status = false;
df2069ac CY	685
	686	mtu3_gadget_init_eps(mtu);
	687
ba428976	688	return usb_add_gadget_udc(mtu->dev, &mtu->g);
df2069ac CY	689	}
	690
	691	void mtu3_gadget_cleanup(struct mtu3 *mtu)
	692	{
	693	usb_del_gadget_udc(&mtu->g);
	694	}
	695
	696	void mtu3_gadget_resume(struct mtu3 *mtu)
	697	{
	698	dev_dbg(mtu->dev, "gadget RESUME\n");
	699	if (mtu->gadget_driver && mtu->gadget_driver->resume) {
	700	spin_unlock(&mtu->lock);
	701	mtu->gadget_driver->resume(&mtu->g);
	702	spin_lock(&mtu->lock);
	703	}
	704	}
	705
	706	/* called when SOF packets stop for 3+ msec or enters U3 */
	707	void mtu3_gadget_suspend(struct mtu3 *mtu)
	708	{
	709	dev_dbg(mtu->dev, "gadget SUSPEND\n");
	710	if (mtu->gadget_driver && mtu->gadget_driver->suspend) {
	711	spin_unlock(&mtu->lock);
	712	mtu->gadget_driver->suspend(&mtu->g);
	713	spin_lock(&mtu->lock);
	714	}
	715	}
	716
	717	/* called when VBUS drops below session threshold, and in other cases */
	718	void mtu3_gadget_disconnect(struct mtu3 *mtu)
	719	{
	720	dev_dbg(mtu->dev, "gadget DISCONNECT\n");
	721	if (mtu->gadget_driver && mtu->gadget_driver->disconnect) {
	722	spin_unlock(&mtu->lock);
	723	mtu->gadget_driver->disconnect(&mtu->g);
	724	spin_lock(&mtu->lock);
	725	}
	726
0eae4958	727	mtu3_state_reset(mtu);
df2069ac CY	728	usb_gadget_set_state(&mtu->g, USB_STATE_NOTATTACHED);
	729	}
	730
	731	void mtu3_gadget_reset(struct mtu3 *mtu)
	732	{
	733	dev_dbg(mtu->dev, "gadget RESET\n");
	734
	735	/* report disconnect, if we didn't flush EP state */
	736	if (mtu->g.speed != USB_SPEED_UNKNOWN)
	737	mtu3_gadget_disconnect(mtu);
0eae4958 CY	738	else
0eae4958 CY	739	mtu3_state_reset(mtu);
df2069ac	740	}