diff options
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 319 | ||||
| -rw-r--r-- | drivers/usb/host/xhci.h | 5 |
2 files changed, 324 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index fa8c9355913..da3519e76e2 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1472,6 +1472,104 @@ static int process_ctrl_td(struct xhci_hcd *xhci, struct xhci_td *td, } /* + * Process isochronous tds, update urb packet status and actual_length. + */ +static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, + union xhci_trb *event_trb, struct xhci_transfer_event *event, + struct xhci_virt_ep *ep, int *status) +{ + struct xhci_ring *ep_ring; + struct urb_priv *urb_priv; + int idx; + int len = 0; + int skip_td = 0; + union xhci_trb *cur_trb; + struct xhci_segment *cur_seg; + u32 trb_comp_code; + + ep_ring = xhci_dma_to_transfer_ring(ep, event->buffer); + trb_comp_code = GET_COMP_CODE(event->transfer_len); + urb_priv = td->urb->hcpriv; + idx = urb_priv->td_cnt; + + if (ep->skip) { + /* The transfer is partly done */ + *status = -EXDEV; + td->urb->iso_frame_desc[idx].status = -EXDEV; + } else { + /* handle completion code */ + switch (trb_comp_code) { + case COMP_SUCCESS: + td->urb->iso_frame_desc[idx].status = 0; + xhci_dbg(xhci, "Successful isoc transfer!\n"); + break; + case COMP_SHORT_TX: + if (td->urb->transfer_flags & URB_SHORT_NOT_OK) + td->urb->iso_frame_desc[idx].status = + -EREMOTEIO; + else + td->urb->iso_frame_desc[idx].status = 0; + break; + case COMP_BW_OVER: + td->urb->iso_frame_desc[idx].status = -ECOMM; + skip_td = 1; + break; + case COMP_BUFF_OVER: + case COMP_BABBLE: + td->urb->iso_frame_desc[idx].status = -EOVERFLOW; + skip_td = 1; + break; + case COMP_STALL: + td->urb->iso_frame_desc[idx].status = -EPROTO; + skip_td = 1; + break; + case COMP_STOP: + case COMP_STOP_INVAL: + break; + default: + td->urb->iso_frame_desc[idx].status = -1; + break; + } + } + + /* calc actual length */ + if (ep->skip) { + td->urb->iso_frame_desc[idx].actual_length = 0; + return finish_td(xhci, td, event_trb, event, ep, status, true); + } + + if (trb_comp_code == COMP_SUCCESS || skip_td == 1) { + td->urb->iso_frame_desc[idx].actual_length = + td->urb->iso_frame_desc[idx].length; + td->urb->actual_length += + td->urb->iso_frame_desc[idx].length; + } else { + for (cur_trb = ep_ring->dequeue, + cur_seg = ep_ring->deq_seg; cur_trb != event_trb; + next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) { + if ((cur_trb->generic.field[3] & + TRB_TYPE_BITMASK) != TRB_TYPE(TRB_TR_NOOP) && + (cur_trb->generic.field[3] & + TRB_TYPE_BITMASK) != TRB_TYPE(TRB_LINK)) + len += + TRB_LEN(cur_trb->generic.field[2]); + } + len += TRB_LEN(cur_trb->generic.field[2]) - + TRB_LEN(event->transfer_len); + + if (trb_comp_code != COMP_STOP_INVAL) { + td->urb->iso_frame_desc[idx].actual_length = len; + td->urb->actual_length += len; + } + } + + if ((idx == urb_priv->length - 1) && *status == -EINPROGRESS) + *status = 0; + + return finish_td(xhci, td, event_trb, event, ep, status, false); +} + +/* * Process bulk and interrupt tds, update urb status and actual_length. */ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td, @@ -1768,6 +1866,9 @@ static int handle_tx_event(struct xhci_hcd *xhci, if (usb_endpoint_xfer_control(&td->urb->ep->desc)) ret = process_ctrl_td(xhci, td, event_trb, event, ep, &status); + else if (usb_endpoint_xfer_isoc(&td->urb->ep->desc)) + ret = process_isoc_td(xhci, td, event_trb, event, ep, + &status); else ret = process_bulk_intr_td(xhci, td, event_trb, event, ep, &status); @@ -2553,6 +2654,224 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, return 0; } +static int count_isoc_trbs_needed(struct xhci_hcd *xhci, + struct urb *urb, int i) +{ + int num_trbs = 0; + u64 addr, td_len, running_total; + + addr = (u64) (urb->transfer_dma + urb->iso_frame_desc[i].offset); + td_len = urb->iso_frame_desc[i].length; + + running_total = TRB_MAX_BUFF_SIZE - + (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); + if (running_total != 0) + num_trbs++; + + while (running_total < td_len) { + num_trbs++; + running_total += TRB_MAX_BUFF_SIZE; + } + + return num_trbs; +} + +/* This is for isoc transfer */ +static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, + struct urb *urb, int slot_id, unsigned int ep_index) +{ + struct xhci_ring *ep_ring; + struct urb_priv *urb_priv; + struct xhci_td *td; + int num_tds, trbs_per_td; + struct xhci_generic_trb *start_trb; + bool first_trb; + int start_cycle; + u32 field, length_field; + int running_total, trb_buff_len, td_len, td_remain_len, ret; + u64 start_addr, addr; + int i, j; + + ep_ring = xhci->devs[slot_id]->eps[ep_index].ring; + + num_tds = urb->number_of_packets; + if (num_tds < 1) { + xhci_dbg(xhci, "Isoc URB with zero packets?\n"); + return -EINVAL; + } + + if (!in_interrupt()) + dev_dbg(&urb->dev->dev, "ep %#x - urb len = %#x (%d)," + " addr = %#llx, num_tds = %d\n", + urb->ep->desc.bEndpointAddress, + urb->transfer_buffer_length, + urb->transfer_buffer_length, + (unsigned long long)urb->transfer_dma, + num_tds); + + start_addr = (u64) urb->transfer_dma; + start_trb = &ep_ring->enqueue->generic; + start_cycle = ep_ring->cycle_state; + + /* Queue the first TRB, even if it's zero-length */ + for (i = 0; i < num_tds; i++) { + first_trb = true; + + running_total = 0; + addr = start_addr + urb->iso_frame_desc[i].offset; + td_len = urb->iso_frame_desc[i].length; + td_remain_len = td_len; + + trbs_per_td = count_isoc_trbs_needed(xhci, urb, i); + + ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, + urb->stream_id, trbs_per_td, urb, i, mem_flags); + if (ret < 0) + return ret; + + urb_priv = urb->hcpriv; + td = urb_priv->td[i]; + + for (j = 0; j < trbs_per_td; j++) { + u32 remainder = 0; + field = 0; + + if (first_trb) { + /* Queue the isoc TRB */ + field |= TRB_TYPE(TRB_ISOC); + /* Assume URB_ISO_ASAP is set */ + field |= TRB_SIA; + if (i > 0) + field |= ep_ring->cycle_state; + first_trb = false; + } else { + /* Queue other normal TRBs */ + field |= TRB_TYPE(TRB_NORMAL); + field |= ep_ring->cycle_state; + } + + /* Chain all the TRBs together; clear the chain bit in + * the last TRB to indicate it's the last TRB in the + * chain. + */ + if (j < trbs_per_td - 1) { + field |= TRB_CHAIN; + } else { + td->last_trb = ep_ring->enqueue; + field |= TRB_IOC; + } + + /* Calculate TRB length */ + trb_buff_len = TRB_MAX_BUFF_SIZE - + (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); + if (trb_buff_len > td_remain_len) + trb_buff_len = td_remain_len; + + remainder = xhci_td_remainder(td_len - running_total); + length_field = TRB_LEN(trb_buff_len) | + remainder | + TRB_INTR_TARGET(0); + queue_trb(xhci, ep_ring, false, false, + lower_32_bits(addr), + upper_32_bits(addr), + length_field, + /* We always want to know if the TRB was short, + * or we won't get an event when it completes. + * (Unless we use event data TRBs, which are a + * waste of space and HC resources.) + */ + field | TRB_ISP); + running_total += trb_buff_len; + + addr += trb_buff_len; + td_remain_len -= trb_buff_len; + } + + /* Check TD length */ + if (running_total != td_len) { + xhci_err(xhci, "ISOC TD length unmatch\n"); + return -EINVAL; + } + } + + wmb(); + start_trb->field[3] |= start_cycle; + + ring_ep_doorbell(xhci, slot_id, ep_index, urb->stream_id); + return 0; +} + +/* + * Check transfer ring to guarantee there is enough room for the urb. + * Update ISO URB start_frame and interval. + * Update interval as xhci_queue_intr_tx does. Just use xhci frame_index to + * update the urb->start_frame by now. + * Always assume URB_ISO_ASAP set, and NEVER use urb->start_frame as input. + */ +int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags, + struct urb *urb, int slot_id, unsigned int ep_index) +{ + struct xhci_virt_device *xdev; + struct xhci_ring *ep_ring; + struct xhci_ep_ctx *ep_ctx; + int start_frame; + int xhci_interval; + int ep_interval; + int num_tds, num_trbs, i; + int ret; + + xdev = xhci->devs[slot_id]; + ep_ring = xdev->eps[ep_index].ring; + ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index); + + num_trbs = 0; + num_tds = urb->number_of_packets; + for (i = 0; i < num_tds; i++) + num_trbs += count_isoc_trbs_needed(xhci, urb, i); + + /* Check the ring to guarantee there is enough room for the whole urb. + * Do not insert any td of the urb to the ring if the check failed. + */ + ret = prepare_ring(xhci, ep_ring, ep_ctx->ep_info & EP_STATE_MASK, + num_trbs, mem_flags); + if (ret) + return ret; + + start_frame = xhci_readl(xhci, &xhci->run_regs->microframe_index); + start_frame &= 0x3fff; + + urb->start_frame = start_frame; + if (urb->dev->speed == USB_SPEED_LOW || + urb->dev->speed == USB_SPEED_FULL) + urb->start_frame >>= 3; + + xhci_interval = EP_INTERVAL_TO_UFRAMES(ep_ctx->ep_info); + ep_interval = urb->interval; + /* Convert to microframes */ + if (urb->dev->speed == USB_SPEED_LOW || + urb->dev->speed == USB_SPEED_FULL) + ep_interval *= 8; + /* FIXME change this to a warning and a suggestion to use the new API + * to set the polling interval (once the API is added). + */ + if (xhci_interval != ep_interval) { + if (!printk_ratelimit()) + dev_dbg(&urb->dev->dev, "Driver uses different interval" + " (%d microframe%s) than xHCI " + "(%d microframe%s)\n", + ep_interval, + ep_interval == 1 ? "" : "s", + xhci_interval, + xhci_interval == 1 ? "" : "s"); + urb->interval = xhci_interval; + /* Convert back to frames for LS/FS devices */ + if (urb->dev->speed == USB_SPEED_LOW || + urb->dev->speed == USB_SPEED_FULL) + urb->interval /= 8; + } + return xhci_queue_isoc_tx(xhci, GFP_ATOMIC, urb, slot_id, ep_index); +} + /**** Command Ring Operations ****/ /* Generic function for queueing a command TRB on the command ring. diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index ebf62082950..e1383d91468 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -919,6 +919,9 @@ struct xhci_event_cmd { /* Control transfer TRB specific fields */ #define TRB_DIR_IN (1<<16) +/* Isochronous TRB specific fields */ +#define TRB_SIA (1<<31) + struct xhci_generic_trb { u32 field[4]; }; @@ -1416,6 +1419,8 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index); int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index); +int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags, + struct urb *urb, int slot_id, unsigned int ep_index); int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, u32 slot_id, bool command_must_succeed); int xhci_queue_evaluate_context(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr, |