lh7a40x_udc.c

ARM S3C2410 USB SLAVE LINUX驱动

		      _ep ? ep->ep.name : NULL);
		return -EINVAL;
	}

	spin_lock_irqsave(&ep->dev->lock, flags);

	usb_set_index(ep_index(ep));

	/* Nuke all pending requests (does flush) */
	nuke(ep, -ESHUTDOWN);

	/* Disable ep IRQ */
	pio_irq_disable(ep_index(ep));

	ep->desc = 0;
	ep->stopped = 1;

	spin_unlock_irqrestore(&ep->dev->lock, flags);

	DEBUG("%s: disabled %s\n", __FUNCTION__, _ep->name);
	return 0;
}

static struct usb_request *lh7a40x_alloc_request(struct usb_ep *ep,
						 unsigned gfp_flags)
{
	struct lh7a40x_request *req;

	DEBUG("%s, %p\n", __FUNCTION__, ep);

	req = kmalloc(sizeof *req, gfp_flags);
	if (!req)
		return 0;

	memset(req, 0, sizeof *req);
	INIT_LIST_HEAD(&req->queue);

	return &req->req;
}

static void lh7a40x_free_request(struct usb_ep *ep, struct usb_request *_req)
{
	struct lh7a40x_request *req;

	DEBUG("%s, %p\n", __FUNCTION__, ep);

	req = container_of(_req, struct lh7a40x_request, req);
	WARN_ON(!list_empty(&req->queue));
	kfree(req);
}

static void *lh7a40x_alloc_buffer(struct usb_ep *ep, unsigned bytes,
				  dma_addr_t * dma, unsigned gfp_flags)
{
	char *retval;

	DEBUG("%s (%p, %d, %d)\n", __FUNCTION__, ep, bytes, gfp_flags);

	retval = kmalloc(bytes, gfp_flags & ~(__GFP_DMA | __GFP_HIGHMEM));
	if (retval)
		*dma = virt_to_bus(retval);
	return retval;
}

static void lh7a40x_free_buffer(struct usb_ep *ep, void *buf, dma_addr_t dma,
				unsigned bytes)
{
	DEBUG("%s, %p\n", __FUNCTION__, ep);
	kfree(buf);
}

/** Queue one request
 *  Kickstart transfer if needed
 *  NOTE: Sets INDEX register
 */
static int lh7a40x_queue(struct usb_ep *_ep, struct usb_request *_req,
			 unsigned gfp_flags)
{
	struct lh7a40x_request *req;
	struct lh7a40x_ep *ep;
	struct lh7a40x_udc *dev;
	unsigned long flags;

	DEBUG("\n\n\n%s, %p\n", __FUNCTION__, _ep);

	req = container_of(_req, struct lh7a40x_request, req);
	if (unlikely
	    (!_req || !_req->complete || !_req->buf
	     || !list_empty(&req->queue))) {
		DEBUG("%s, bad params\n", __FUNCTION__);
		return -EINVAL;
	}

	ep = container_of(_ep, struct lh7a40x_ep, ep);
	if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
		DEBUG("%s, bad ep\n", __FUNCTION__);
		return -EINVAL;
	}

	dev = ep->dev;
	if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
		DEBUG("%s, bogus device state %p\n", __FUNCTION__, dev->driver);
		return -ESHUTDOWN;
	}

	DEBUG("%s queue req %p, len %d buf %p\n", _ep->name, _req, _req->length,
	      _req->buf);

	spin_lock_irqsave(&dev->lock, flags);

	_req->status = -EINPROGRESS;
	_req->actual = 0;

	/* kickstart this i/o queue? */
	DEBUG("Add to %d Q %d %d\n", ep_index(ep), list_empty(&ep->queue),
	      ep->stopped);
	if (list_empty(&ep->queue) && likely(!ep->stopped)) {
		u32 csr;

		if (unlikely(ep_index(ep) == 0)) {
			/* EP0 */
			list_add_tail(&req->queue, &ep->queue);
			lh7a40x_ep0_kick(dev, ep);
			req = 0;
		} else if (ep_is_in(ep)) {
			/* EP1 & EP3 */
			usb_set_index(ep_index(ep));
			csr = usb_read(ep->csr1);
			pio_irq_enable(ep_index(ep));
			if ((csr & USB_IN_CSR1_FIFO_NOT_EMPTY) == 0) {
				if (write_fifo(ep, req) == 1)
					req = 0;
			}
		} else {
			/* EP2 */
			usb_set_index(ep_index(ep));
			csr = usb_read(ep->csr1);
			pio_irq_enable(ep_index(ep));
			if (!(csr & USB_OUT_CSR1_FIFO_FULL)) {
				if (read_fifo(ep, req) == 1)
					req = 0;
			}
		}
	}

	/* pio or dma irq handler advances the queue. */
	if (likely(req != 0))
		list_add_tail(&req->queue, &ep->queue);

	spin_unlock_irqrestore(&dev->lock, flags);

	return 0;
}

/* dequeue JUST ONE request */
static int lh7a40x_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
	struct lh7a40x_ep *ep;
	struct lh7a40x_request *req;
	unsigned long flags;

	DEBUG("%s, %p\n", __FUNCTION__, _ep);

	ep = container_of(_ep, struct lh7a40x_ep, ep);
	if (!_ep || ep->ep.name == ep0name)
		return -EINVAL;

	spin_lock_irqsave(&ep->dev->lock, flags);

	/* make sure it's actually queued on this endpoint */
	list_for_each_entry(req, &ep->queue, queue) {
		if (&req->req == _req)
			break;
	}
	if (&req->req != _req) {
		spin_unlock_irqrestore(&ep->dev->lock, flags);
		return -EINVAL;
	}

	done(ep, req, -ECONNRESET);

	spin_unlock_irqrestore(&ep->dev->lock, flags);
	return 0;
}

/** Halt specific EP
 *  Return 0 if success
 *  NOTE: Sets INDEX register to EP !
 */
static int lh7a40x_set_halt(struct usb_ep *_ep, int value)
{
	struct lh7a40x_ep *ep;
	unsigned long flags;

	ep = container_of(_ep, struct lh7a40x_ep, ep);
	if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
		DEBUG("%s, bad ep\n", __FUNCTION__);
		return -EINVAL;
	}

	usb_set_index(ep_index(ep));

	DEBUG("%s, ep %d, val %d\n", __FUNCTION__, ep_index(ep), value);

	spin_lock_irqsave(&ep->dev->lock, flags);

	if (ep_index(ep) == 0) {
		/* EP0 */
		usb_set(EP0_SEND_STALL, ep->csr1);
	} else if (ep_is_in(ep)) {
		u32 csr = usb_read(ep->csr1);
		if (value && ((csr & USB_IN_CSR1_FIFO_NOT_EMPTY)
			      || !list_empty(&ep->queue))) {
			/*
			 * Attempts to halt IN endpoints will fail (returning -EAGAIN)
			 * if any transfer requests are still queued, or if the controller
			 * FIFO still holds bytes that the host hasn抰 collected.
			 */
			spin_unlock_irqrestore(&ep->dev->lock, flags);
			DEBUG
			    ("Attempt to halt IN endpoint failed (returning -EAGAIN) %d %d\n",
			     (csr & USB_IN_CSR1_FIFO_NOT_EMPTY),
			     !list_empty(&ep->queue));
			return -EAGAIN;
		}
		flush(ep);
		if (value)
			usb_set(USB_IN_CSR1_SEND_STALL, ep->csr1);
		else {
			usb_clear(USB_IN_CSR1_SEND_STALL, ep->csr1);
			usb_set(USB_IN_CSR1_CLR_DATA_TOGGLE, ep->csr1);
		}

	} else {

		flush(ep);
		if (value)
			usb_set(USB_OUT_CSR1_SEND_STALL, ep->csr1);
		else {
			usb_clear(USB_OUT_CSR1_SEND_STALL, ep->csr1);
			usb_set(USB_OUT_CSR1_CLR_DATA_REG, ep->csr1);
		}
	}

	if (value) {
		ep->stopped = 1;
	} else {
		ep->stopped = 0;
	}

	spin_unlock_irqrestore(&ep->dev->lock, flags);

	DEBUG("%s %s halted\n", _ep->name, value == 0 ? "NOT" : "IS");

	return 0;
}

/** Return bytes in EP FIFO
 *  NOTE: Sets INDEX register to EP
 */
static int lh7a40x_fifo_status(struct usb_ep *_ep)
{
	u32 csr;
	int count = 0;
	struct lh7a40x_ep *ep;

	ep = container_of(_ep, struct lh7a40x_ep, ep);
	if (!_ep) {
		DEBUG("%s, bad ep\n", __FUNCTION__);
		return -ENODEV;
	}

	DEBUG("%s, %d\n", __FUNCTION__, ep_index(ep));

	/* LPD can't report unclaimed bytes from IN fifos */
	if (ep_is_in(ep))
		return -EOPNOTSUPP;

	usb_set_index(ep_index(ep));

	csr = usb_read(ep->csr1);
	if (ep->dev->gadget.speed != USB_SPEED_UNKNOWN ||
	    csr & USB_OUT_CSR1_OUT_PKT_RDY) {
		count = usb_read(USB_OUT_FIFO_WC1);
	}

	return count;
}

/** Flush EP FIFO
 *  NOTE: Sets INDEX register to EP
 */
static void lh7a40x_fifo_flush(struct usb_ep *_ep)
{
	struct lh7a40x_ep *ep;

	ep = container_of(_ep, struct lh7a40x_ep, ep);
	if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
		DEBUG("%s, bad ep\n", __FUNCTION__);
		return;
	}

	usb_set_index(ep_index(ep));
	flush(ep);
}

/****************************************************************/
/* End Point 0 related functions                                */
/****************************************************************/

/* return:  0 = still running, 1 = completed, negative = errno */
static int write_fifo_ep0(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
{
	u32 max;
	unsigned count;
	int is_last;

	max = ep_maxpacket(ep);

	DEBUG_EP0("%s\n", __FUNCTION__);

	count = write_packet(ep, req, max);

	/* last packet is usually short (or a zlp) */
	if (unlikely(count != max))
		is_last = 1;
	else {
		if (likely(req->req.length != req->req.actual) || req->req.zero)
			is_last = 0;
		else
			is_last = 1;
	}

	DEBUG_EP0("%s: wrote %s %d bytes%s %d left %p\n", __FUNCTION__,
		  ep->ep.name, count,
		  is_last ? "/L" : "", req->req.length - req->req.actual, req);

	/* requests complete when all IN data is in the FIFO */
	if (is_last) {
		done(ep, req, 0);
		return 1;
	}

	return 0;
}

static __inline__ int lh7a40x_fifo_read(struct lh7a40x_ep *ep,
					unsigned char *cp, int max)
{
	int bytes;
	int count = usb_read(USB_OUT_FIFO_WC1);
	volatile u32 *fifo = (volatile u32 *)ep->fifo;

	if (count > max)
		count = max;
	bytes = count;
	while (count--)
		*cp++ = *fifo & 0xFF;
	return bytes;
}

static __inline__ void lh7a40x_fifo_write(struct lh7a40x_ep *ep,
					  unsigned char *cp, int count)
{
	volatile u32 *fifo = (volatile u32 *)ep->fifo;
	DEBUG_EP0("fifo_write: %d %d\n", ep_index(ep), count);
	while (count--)
		*fifo = *cp++;
}

static int read_fifo_ep0(struct lh7a40x_ep *ep, struct lh7a40x_request *req)
{
	u32 csr;
	u8 *buf;
	unsigned bufferspace, count, is_short;
	volatile u32 *fifo = (volatile u32 *)ep->fifo;

	DEBUG_EP0("%s\n", __FUNCTION__);

	csr = usb_read(USB_EP0_CSR);
	if (!(csr & USB_OUT_CSR1_OUT_PKT_RDY))
		return 0;

	buf = req->req.buf + req->req.actual;
	prefetchw(buf);
	bufferspace = req->req.length - req->req.actual;

	/* read all bytes from this packet */
	if (likely(csr & EP0_OUT_PKT_RDY)) {
		count = usb_read(USB_OUT_FIFO_WC1);
		req->req.actual += min(count, bufferspace);
	} else			/* zlp */
		count = 0;

	is_short = (count < ep->ep.maxpacket);
	DEBUG_EP0("read %s %02x, %d bytes%s req %p %d/%d\n",
		  ep->ep.name, csr, count,
		  is_short ? "/S" : "", req, req->req.actual, req->req.length);

	while (likely(count-- != 0)) {
		u8 byte = (u8) (*fifo & 0xff);

		if (unlikely(bufferspace == 0)) {
			/* this happens when the driver's buffer
			 * is smaller than what the host sent.
			 * discard the extra data.
			 */
			if (req->req.status != -EOVERFLOW)
				DEBUG_EP0("%s overflow %d\n", ep->ep.name,
					  count);
			req->req.status = -EOVERFLOW;
		} else {
			*buf++ = byte;
			bufferspace--;
		}
	}

	/* completion */
	if (is_short || req->req.actual == req->req.length) {
		done(ep, req, 0);
		return 1;
	}

	/* finished that packet.  the next one may be waiting... */
	return 0;
}

/**
 * udc_set_address - set the USB address for this device
 * @address:
 *
 * Called from control endpoint function after it decodes a set address setup packet.
 */
static void udc_set_address(struct lh7a40x_udc *dev, unsigned char address)
{
	DEBUG_EP0("%s: %d\n", __FUNCTION__, address);
	/* c.f. 15.1.2.2 Table 15-4 address will be used after DATA_END is set */
	dev->usb_address = address;
	usb_set((address & USB_FA_FUNCTION_ADDR), USB_FA);
	usb_set(USB_FA_ADDR_UPDATE | (address & USB_FA_FUNCTION_ADDR), USB_FA);
	/* usb_read(USB_FA); */
}

/*
 * DATA_STATE_RECV (OUT_PKT_RDY)
 *      - if error
 *              set EP0_CLR_OUT | EP0_DATA_END | EP0_SEND_STALL bits
 *      - else
 *              set EP0_CLR_OUT bit
 				if last set EP0_DATA_END bit
 */
static void lh7a40x_ep0_out(struct lh7a40x_udc *dev, u32 csr)
{
	struct lh7a40x_request *req;
	struct lh7a40x_ep *ep = &dev->ep[0];
	int ret;

	DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);

	if (list_empty(&ep->queue))
		req = 0;
	else
		req = list_entry(ep->queue.next, struct lh7a40x_request, queue);

	if (req) {

		if (req->req.length == 0) {
			DEBUG_EP0("ZERO LENGTH OUT!\n");
			usb_set((EP0_CLR_OUT | EP0_DATA_END), USB_EP0_CSR);
			dev->ep0state = WAIT_FOR_SETUP;
			return;
		}
		ret = read_fifo_ep0(ep, req);
		if (ret) {
			/* Done! */
			DEBUG_EP0("%s: finished, waiting for status\n",
				  __FUNCTION__);

			usb_set((EP0_CLR_OUT | EP0_DATA_END), USB_EP0_CSR);
			dev->ep0state = WAIT_FOR_SETUP;
		} else {
			/* Not done yet.. */
			DEBUG_EP0("%s: not finished\n", __FUNCTION__);
			usb_set(EP0_CLR_OUT, USB_EP0_CSR);
		}
	} else {
		DEBUG_EP0("NO REQ??!\n");
	}
}

/*
 * DATA_STATE_XMIT
 */
static int lh7a40x_ep0_in(struct lh7a40x_udc *dev, u32 csr)
{
	struct lh7a40x_request *req;
	struct lh7a40x_ep *ep = &dev->ep[0];
	int ret, need_zlp = 0;

	DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);

	if (list_empty(&ep->queue))
		req = 0;
	else
		req = list_entry(ep->queue.next, struct lh7a40x_request, queue);

	if (!req) {
		DEBUG_EP0("%s: NULL REQ\n", __FUNCTION__);
		return 0;
	}

	if (req->req.length == 0) {

		usb_set((EP0_IN_PKT_RDY | EP0_DATA_END), USB_EP0_CSR);
		dev->ep0state = WAIT_FOR_SETUP;
		return 1;
	}

	if (req->req.length - req->req.actual == EP0_PACKETSIZE) {
		/* Next write will end with the packet size, */
		/* so we need Zero-length-packet */
		need_zlp = 1;
	}

	ret = write_fifo_ep0(ep, req);

	if (ret == 1 && !need_zlp) {
		/* Last packet */
		DEBUG_EP0("%s: finished, waiting for status\n", __FUNCTION__);

		usb_set((EP0_IN_PKT_RDY | EP0_DATA_END), USB_EP0_CSR);
		dev->ep0state = WAIT_FOR_SETUP;
	} else {
		DEBUG_EP0("%s: not finished\n", __FUNCTION__);
		usb_set(EP0_IN_PKT_RDY, USB_EP0_CSR);
	}

	if (need_zlp) {
		DEBUG_EP0("%s: Need ZLP!\n", __FUNCTION__);
		usb_set(EP0_IN_PKT_RDY, USB_EP0_CSR);
		dev->ep0state = DATA_STATE_NEED_ZLP;
	}