int usb_ept_queue_xfer(struct msm_endpoint *ept, struct usb_request *_req)
{
unsigned long flags;
struct msm_request *req = to_msm_request(_req);
struct msm_request *last;
struct usb_info *ui = ept->ui;
struct ept_queue_item *item = req->item;
unsigned length = req->req.length;
if (length > 0x4000)
return -EMSGSIZE;
spin_lock_irqsave(&ui->lock, flags);
if (req->busy) {
req->req.status = -EBUSY;
spin_unlock_irqrestore(&ui->lock, flags);
INFO("usb_ept_queue_xfer() tried to queue busy request\n");
return -EBUSY;
}
if (!ui->online && (ept->num != 0)) {
req->req.status = -ESHUTDOWN;
spin_unlock_irqrestore(&ui->lock, flags);
INFO("usb_ept_queue_xfer() called while offline\n");
return -ESHUTDOWN;
}
req->busy = 1;
req->live = 0;
req->next = 0;
req->req.status = -EBUSY;
req->dma = dma_map_single(NULL, req->req.buf, length,
(ept->flags & EPT_FLAG_IN) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE);
/* prepare the transaction descriptor item for the hardware */
item->next = TERMINATE;
item->info = INFO_BYTES(length) | INFO_IOC | INFO_ACTIVE;
item->page0 = req->dma;
item->page1 = (req->dma + 0x1000) & 0xfffff000;
item->page2 = (req->dma + 0x2000) & 0xfffff000;
item->page3 = (req->dma + 0x3000) & 0xfffff000;
/* Add the new request to the end of the queue */
last = ept->last;
if (last) {
/* Already requests in the queue. add us to the
* end, but let the completion interrupt actually
* start things going, to avoid hw issues
*/
last->next = req;
/* only modify the hw transaction next pointer if
* that request is not live
*/
if (!last->live)
last->item->next = req->item_dma;
} else {
/* queue was empty -- kick the hardware */
ept->req = req;
usb_ept_start(ept);
}
ept->last = req;
spin_unlock_irqrestore(&ui->lock, flags);
return 0;
}
/*
* Assumes that TDs allocated already are not freed.
* But it can handle case where TDs are freed as well.
*/
int udc_request_queue(struct udc_endpoint *ept, struct udc_request *_req)
{
unsigned xfer = 0;
struct ept_queue_item *item, *curr_item;
struct usb_request *req = (struct usb_request *)_req;
unsigned phys = (unsigned)req->req.buf;
unsigned len = req->req.length;
unsigned int count = 0;
curr_item = NULL;
xfer = (len > MAX_TD_XFER_SIZE) ? MAX_TD_XFER_SIZE : len;
/*
* First TD allocated during request allocation
*/
item = req->item;
item->info = INFO_BYTES(xfer) | INFO_ACTIVE;
item->page0 = phys;
item->page1 = (phys & 0xfffff000) + 0x1000;
item->page2 = (phys & 0xfffff000) + 0x2000;
item->page3 = (phys & 0xfffff000) + 0x3000;
item->page4 = (phys & 0xfffff000) + 0x4000;
phys += xfer;
curr_item = item;
len -= xfer;
/*
* If transfer length is more then
* accomodate by 1 TD
* we add more transfer descriptors
*/
while (len > 0) {
xfer = (len > MAX_TD_XFER_SIZE) ? MAX_TD_XFER_SIZE : len;
if (curr_item->next == TERMINATE) {
/*
* Allocate new TD only if chain doesnot
* exist already
*/
item = memalign(CACHE_LINE,
ROUNDUP(sizeof(struct ept_queue_item), CACHE_LINE));
if (!item) {
dprintf(ALWAYS, "allocate USB item fail ept%d"
"%s queue\n",
"td count = %d\n",
ept->num,
ept->in ? "in" : "out",
count);
return -1;
} else {
count ++;
curr_item->next = PA(item);
item->next = TERMINATE;
}
} else
/* Since next TD in chain already exists */
item = VA(curr_item->next);
/* Update TD with transfer information */
item->info = INFO_BYTES(xfer) | INFO_ACTIVE;
item->page0 = phys;
item->page1 = (phys & 0xfffff000) + 0x1000;
item->page2 = (phys & 0xfffff000) + 0x2000;
item->page3 = (phys & 0xfffff000) + 0x3000;
item->page4 = (phys & 0xfffff000) + 0x4000;
curr_item = item;
len -= xfer;
phys += xfer;
}
/* Terminate and set interrupt for last TD */
curr_item->next = TERMINATE;
curr_item->info |= INFO_IOC;
enter_critical_section();
ept->head->next = PA(req->item);
ept->head->info = 0;
ept->req = req;
arch_clean_invalidate_cache_range((addr_t) ept,
sizeof(struct udc_endpoint));
arch_clean_invalidate_cache_range((addr_t) ept->head,
sizeof(struct ept_queue_head));
arch_clean_invalidate_cache_range((addr_t) ept->req,
sizeof(struct usb_request));
arch_clean_invalidate_cache_range((addr_t) VA(req->req.buf),
req->req.length);
item = req->item;
/* Write all TD's to memory from cache */
while (item != NULL) {
curr_item = item;
if (curr_item->next == TERMINATE)
item = NULL;
else
item = curr_item->next;
arch_clean_invalidate_cache_range((addr_t) curr_item,
sizeof(struct ept_queue_item));
}
DBG("ept%d %s queue req=%p\n", ept->num, ept->in ? "in" : "out", req);
writel(ept->bit, USB_ENDPTPRIME);
exit_critical_section();
return 0;
}
