From: Pavankumar Kondeti Date: Fri, 18 Feb 2011 12:13:16 +0000 (+0530) Subject: USB: gadget: Implement hardware queuing in ci13xxx_udc X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0e6ca1998e4c803b0be98f97a1d1e1ea562b8964;p=linux-beck.git USB: gadget: Implement hardware queuing in ci13xxx_udc Chipidea USB controller provides a means (Add dTD TripWire semaphore) for safely adding a new dTD to an active endpoint's linked list. Make use of this feature to improve performance. Dynamically allocate and free dTD for supporting zero length packet termination. Honor no_interrupt flag set by gadget drivers. Signed-off-by: Pavankumar Kondeti Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/gadget/ci13xxx_udc.c b/drivers/usb/gadget/ci13xxx_udc.c index a1c67ae1572a..da01f333a51c 100644 --- a/drivers/usb/gadget/ci13xxx_udc.c +++ b/drivers/usb/gadget/ci13xxx_udc.c @@ -434,20 +434,6 @@ static int hw_ep_get_halt(int num, int dir) return hw_cread(CAP_ENDPTCTRL + num * sizeof(u32), mask) ? 1 : 0; } -/** - * hw_ep_is_primed: test if endpoint is primed (execute without interruption) - * @num: endpoint number - * @dir: endpoint direction - * - * This function returns true if endpoint primed - */ -static int hw_ep_is_primed(int num, int dir) -{ - u32 reg = hw_cread(CAP_ENDPTPRIME, ~0) | hw_cread(CAP_ENDPTSTAT, ~0); - - return test_bit(hw_ep_bit(num, dir), (void *)®); -} - /** * hw_test_and_clear_setup_status: test & clear setup status (execute without * interruption) @@ -472,10 +458,6 @@ static int hw_ep_prime(int num, int dir, int is_ctrl) { int n = hw_ep_bit(num, dir); - /* the caller should flush first */ - if (hw_ep_is_primed(num, dir)) - return -EBUSY; - if (is_ctrl && dir == RX && hw_cread(CAP_ENDPTSETUPSTAT, BIT(num))) return -EAGAIN; @@ -1434,6 +1416,8 @@ static inline u8 _usb_addr(struct ci13xxx_ep *ep) static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq) { unsigned i; + int ret = 0; + unsigned length = mReq->req.length; trace("%p, %p", mEp, mReq); @@ -1441,53 +1425,91 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq) if (mReq->req.status == -EALREADY) return -EALREADY; - if (hw_ep_is_primed(mEp->num, mEp->dir)) - return -EBUSY; - mReq->req.status = -EALREADY; - - if (mReq->req.length && !mReq->req.dma) { + if (length && !mReq->req.dma) { mReq->req.dma = \ dma_map_single(mEp->device, mReq->req.buf, - mReq->req.length, mEp->dir ? - DMA_TO_DEVICE : DMA_FROM_DEVICE); + length, mEp->dir ? DMA_TO_DEVICE : + DMA_FROM_DEVICE); if (mReq->req.dma == 0) return -ENOMEM; mReq->map = 1; } + if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0)) { + mReq->zptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC, + &mReq->zdma); + if (mReq->zptr == NULL) { + if (mReq->map) { + dma_unmap_single(mEp->device, mReq->req.dma, + length, mEp->dir ? DMA_TO_DEVICE : + DMA_FROM_DEVICE); + mReq->req.dma = 0; + mReq->map = 0; + } + return -ENOMEM; + } + memset(mReq->zptr, 0, sizeof(*mReq->zptr)); + mReq->zptr->next = TD_TERMINATE; + mReq->zptr->token = TD_STATUS_ACTIVE; + if (!mReq->req.no_interrupt) + mReq->zptr->token |= TD_IOC; + } /* * TD configuration * TODO - handle requests which spawns into several TDs */ memset(mReq->ptr, 0, sizeof(*mReq->ptr)); - mReq->ptr->next |= TD_TERMINATE; - mReq->ptr->token = mReq->req.length << ffs_nr(TD_TOTAL_BYTES); + mReq->ptr->token = length << ffs_nr(TD_TOTAL_BYTES); mReq->ptr->token &= TD_TOTAL_BYTES; - mReq->ptr->token |= TD_IOC; mReq->ptr->token |= TD_STATUS_ACTIVE; + if (mReq->zptr) { + mReq->ptr->next = mReq->zdma; + } else { + mReq->ptr->next = TD_TERMINATE; + if (!mReq->req.no_interrupt) + mReq->ptr->token |= TD_IOC; + } mReq->ptr->page[0] = mReq->req.dma; for (i = 1; i < 5; i++) mReq->ptr->page[i] = (mReq->req.dma + i * CI13XXX_PAGE_SIZE) & ~TD_RESERVED_MASK; - /* - * QH configuration - * At this point it's guaranteed exclusive access to qhead - * (endpt is not primed) so it's no need to use tripwire - */ + if (!list_empty(&mEp->qh.queue)) { + struct ci13xxx_req *mReqPrev; + int n = hw_ep_bit(mEp->num, mEp->dir); + int tmp_stat; + + mReqPrev = list_entry(mEp->qh.queue.prev, + struct ci13xxx_req, queue); + if (mReqPrev->zptr) + mReqPrev->zptr->next = mReq->dma & TD_ADDR_MASK; + else + mReqPrev->ptr->next = mReq->dma & TD_ADDR_MASK; + wmb(); + if (hw_cread(CAP_ENDPTPRIME, BIT(n))) + goto done; + do { + hw_cwrite(CAP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW); + tmp_stat = hw_cread(CAP_ENDPTSTAT, BIT(n)); + } while (!hw_cread(CAP_USBCMD, USBCMD_ATDTW)); + hw_cwrite(CAP_USBCMD, USBCMD_ATDTW, 0); + if (tmp_stat) + goto done; + } + + /* QH configuration */ mEp->qh.ptr->td.next = mReq->dma; /* TERMINATE = 0 */ mEp->qh.ptr->td.token &= ~TD_STATUS; /* clear status */ - if (mReq->req.zero == 0) - mEp->qh.ptr->cap |= QH_ZLT; - else - mEp->qh.ptr->cap &= ~QH_ZLT; + mEp->qh.ptr->cap |= QH_ZLT; wmb(); /* synchronize before ep prime */ - return hw_ep_prime(mEp->num, mEp->dir, + ret = hw_ep_prime(mEp->num, mEp->dir, mEp->type == USB_ENDPOINT_XFER_CONTROL); +done: + return ret; } /** @@ -1504,8 +1526,15 @@ static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq) if (mReq->req.status != -EALREADY) return -EINVAL; - if (hw_ep_is_primed(mEp->num, mEp->dir)) - hw_ep_flush(mEp->num, mEp->dir); + if ((TD_STATUS_ACTIVE & mReq->ptr->token) != 0) + return -EBUSY; + + if (mReq->zptr) { + if ((TD_STATUS_ACTIVE & mReq->zptr->token) != 0) + return -EBUSY; + dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma); + mReq->zptr = NULL; + } mReq->req.status = 0; @@ -1517,9 +1546,7 @@ static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq) } mReq->req.status = mReq->ptr->token & TD_STATUS; - if ((TD_STATUS_ACTIVE & mReq->req.status) != 0) - mReq->req.status = -ECONNRESET; - else if ((TD_STATUS_HALTED & mReq->req.status) != 0) + if ((TD_STATUS_HALTED & mReq->req.status) != 0) mReq->req.status = -1; else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0) mReq->req.status = -1; @@ -1783,7 +1810,7 @@ static int isr_tr_complete_low(struct ci13xxx_ep *mEp) __releases(mEp->lock) __acquires(mEp->lock) { - struct ci13xxx_req *mReq; + struct ci13xxx_req *mReq, *mReqTemp; int retval; trace("%p", mEp); @@ -1791,34 +1818,25 @@ __acquires(mEp->lock) if (list_empty(&mEp->qh.queue)) return -EINVAL; - /* pop oldest request */ - mReq = list_entry(mEp->qh.queue.next, - struct ci13xxx_req, queue); - list_del_init(&mReq->queue); - - retval = _hardware_dequeue(mEp, mReq); - if (retval < 0) { - dbg_event(_usb_addr(mEp), "DONE", retval); - goto done; - } - - dbg_done(_usb_addr(mEp), mReq->ptr->token, retval); - - if (!list_empty(&mEp->qh.queue)) { - struct ci13xxx_req* mReqEnq; - - mReqEnq = list_entry(mEp->qh.queue.next, - struct ci13xxx_req, queue); - _hardware_enqueue(mEp, mReqEnq); + list_for_each_entry_safe(mReq, mReqTemp, &mEp->qh.queue, + queue) { + retval = _hardware_dequeue(mEp, mReq); + if (retval < 0) + break; + list_del_init(&mReq->queue); + dbg_done(_usb_addr(mEp), mReq->ptr->token, retval); + if (mReq->req.complete != NULL) { + spin_unlock(mEp->lock); + mReq->req.complete(&mEp->ep, &mReq->req); + spin_lock(mEp->lock); + } } - if (mReq->req.complete != NULL) { - spin_unlock(mEp->lock); - mReq->req.complete(&mEp->ep, &mReq->req); - spin_lock(mEp->lock); - } + if (retval == EBUSY) + retval = 0; + if (retval < 0) + dbg_event(_usb_addr(mEp), "DONE", retval); - done: return retval; } @@ -2178,15 +2196,15 @@ static int ep_queue(struct usb_ep *ep, struct usb_request *req, /* push request */ mReq->req.status = -EINPROGRESS; mReq->req.actual = 0; - list_add_tail(&mReq->queue, &mEp->qh.queue); - if (list_is_singular(&mEp->qh.queue)) - retval = _hardware_enqueue(mEp, mReq); + retval = _hardware_enqueue(mEp, mReq); if (retval == -EALREADY) { dbg_event(_usb_addr(mEp), "QUEUE", retval); retval = 0; } + if (!retval) + list_add_tail(&mReq->queue, &mEp->qh.queue); done: spin_unlock_irqrestore(mEp->lock, flags); @@ -2206,19 +2224,25 @@ static int ep_dequeue(struct usb_ep *ep, struct usb_request *req) trace("%p, %p", ep, req); - if (ep == NULL || req == NULL || mEp->desc == NULL || - list_empty(&mReq->queue) || list_empty(&mEp->qh.queue)) + if (ep == NULL || req == NULL || mReq->req.status != -EALREADY || + mEp->desc == NULL || list_empty(&mReq->queue) || + list_empty(&mEp->qh.queue)) return -EINVAL; spin_lock_irqsave(mEp->lock, flags); dbg_event(_usb_addr(mEp), "DEQUEUE", 0); - if (mReq->req.status == -EALREADY) - _hardware_dequeue(mEp, mReq); + hw_ep_flush(mEp->num, mEp->dir); /* pop request */ list_del_init(&mReq->queue); + if (mReq->map) { + dma_unmap_single(mEp->device, mReq->req.dma, mReq->req.length, + mEp->dir ? DMA_TO_DEVICE : DMA_FROM_DEVICE); + mReq->req.dma = 0; + mReq->map = 0; + } req->status = -ECONNRESET; if (mReq->req.complete != NULL) { diff --git a/drivers/usb/gadget/ci13xxx_udc.h b/drivers/usb/gadget/ci13xxx_udc.h index a2492b65f98c..3fad3adeacc8 100644 --- a/drivers/usb/gadget/ci13xxx_udc.h +++ b/drivers/usb/gadget/ci13xxx_udc.h @@ -33,6 +33,7 @@ struct ci13xxx_td { /* 0 */ u32 next; #define TD_TERMINATE BIT(0) +#define TD_ADDR_MASK (0xFFFFFFEUL << 5) /* 1 */ u32 token; #define TD_STATUS (0x00FFUL << 0) @@ -74,6 +75,8 @@ struct ci13xxx_req { struct list_head queue; struct ci13xxx_td *ptr; dma_addr_t dma; + struct ci13xxx_td *zptr; + dma_addr_t zdma; }; /* Extension of usb_ep */ @@ -152,6 +155,7 @@ struct ci13xxx { #define USBCMD_RS BIT(0) #define USBCMD_RST BIT(1) #define USBCMD_SUTW BIT(13) +#define USBCMD_ATDTW BIT(14) /* USBSTS & USBINTR */ #define USBi_UI BIT(0)