u32 state;
state = xhci_readl(xhci, &xhci->op_regs->status);
- BUG_ON((state & STS_HALT) == 0);
+ if ((state & STS_HALT) == 0) {
+ xhci_warn(xhci, "Host controller not halted, aborting reset.\n");
+ return 0;
+ }
xhci_dbg(xhci, "// Reset the HC\n");
command = xhci_readl(xhci, &xhci->op_regs->command);
}
/*
+ * Called in interrupt context when there might be work
+ * queued on the event ring
+ *
+ * xhci->lock must be held by caller.
+ */
+static void xhci_work(struct xhci_hcd *xhci)
+{
+ u32 temp;
+ u64 temp_64;
+
+ /*
+ * Clear the op reg interrupt status first,
+ * so we can receive interrupts from other MSI-X interrupters.
+ * Write 1 to clear the interrupt status.
+ */
+ temp = xhci_readl(xhci, &xhci->op_regs->status);
+ temp |= STS_EINT;
+ xhci_writel(xhci, temp, &xhci->op_regs->status);
+ /* FIXME when MSI-X is supported and there are multiple vectors */
+ /* Clear the MSI-X event interrupt status */
+
+ /* Acknowledge the interrupt */
+ temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
+ temp |= 0x3;
+ xhci_writel(xhci, temp, &xhci->ir_set->irq_pending);
+ /* Flush posted writes */
+ xhci_readl(xhci, &xhci->ir_set->irq_pending);
+
+ /* FIXME this should be a delayed service routine that clears the EHB */
+ xhci_handle_event(xhci);
+
+ /* Clear the event handler busy flag (RW1C); the event ring should be empty. */
+ temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
+ xhci_write_64(xhci, temp_64 | ERST_EHB, &xhci->ir_set->erst_dequeue);
+ /* Flush posted writes -- FIXME is this necessary? */
+ xhci_readl(xhci, &xhci->ir_set->irq_pending);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * xHCI spec says we can get an interrupt, and if the HC has an error condition,
+ * we might get bad data out of the event ring. Section 4.10.2.7 has a list of
+ * indicators of an event TRB error, but we check the status *first* to be safe.
+ */
+irqreturn_t xhci_irq(struct usb_hcd *hcd)
+{
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ u32 temp, temp2;
+ union xhci_trb *trb;
+
+ spin_lock(&xhci->lock);
+ trb = xhci->event_ring->dequeue;
+ /* Check if the xHC generated the interrupt, or the irq is shared */
+ temp = xhci_readl(xhci, &xhci->op_regs->status);
+ temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
+ if (temp == 0xffffffff && temp2 == 0xffffffff)
+ goto hw_died;
+
+ if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
+ spin_unlock(&xhci->lock);
+ return IRQ_NONE;
+ }
+ xhci_dbg(xhci, "op reg status = %08x\n", temp);
+ xhci_dbg(xhci, "ir set irq_pending = %08x\n", temp2);
+ xhci_dbg(xhci, "Event ring dequeue ptr:\n");
+ xhci_dbg(xhci, "@%llx %08x %08x %08x %08x\n",
+ (unsigned long long)xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, trb),
+ lower_32_bits(trb->link.segment_ptr),
+ upper_32_bits(trb->link.segment_ptr),
+ (unsigned int) trb->link.intr_target,
+ (unsigned int) trb->link.control);
+
+ if (temp & STS_FATAL) {
+ xhci_warn(xhci, "WARNING: Host System Error\n");
+ xhci_halt(xhci);
+hw_died:
+ xhci_to_hcd(xhci)->state = HC_STATE_HALT;
+ spin_unlock(&xhci->lock);
+ return -ESHUTDOWN;
+ }
+
+ xhci_work(xhci);
+ spin_unlock(&xhci->lock);
+
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+void xhci_event_ring_work(unsigned long arg)
+{
+ unsigned long flags;
+ int temp;
+ u64 temp_64;
+ struct xhci_hcd *xhci = (struct xhci_hcd *) arg;
+ int i, j;
+
+ xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies);
+
+ spin_lock_irqsave(&xhci->lock, flags);
+ temp = xhci_readl(xhci, &xhci->op_regs->status);
+ xhci_dbg(xhci, "op reg status = 0x%x\n", temp);
+ temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
+ xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp);
+ xhci_dbg(xhci, "No-op commands handled = %d\n", xhci->noops_handled);
+ xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask);
+ xhci->error_bitmask = 0;
+ xhci_dbg(xhci, "Event ring:\n");
+ xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
+ xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
+ temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
+ temp_64 &= ~ERST_PTR_MASK;
+ xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
+ xhci_dbg(xhci, "Command ring:\n");
+ xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg);
+ xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
+ xhci_dbg_cmd_ptrs(xhci);
+ for (i = 0; i < MAX_HC_SLOTS; ++i) {
+ if (xhci->devs[i]) {
+ for (j = 0; j < 31; ++j) {
+ if (xhci->devs[i]->ep_rings[j]) {
+ xhci_dbg(xhci, "Dev %d endpoint ring %d:\n", i, j);
+ xhci_debug_segment(xhci, xhci->devs[i]->ep_rings[j]->deq_seg);
+ }
+ }
+ }
+ }
+
+ if (xhci->noops_submitted != NUM_TEST_NOOPS)
+ if (xhci_setup_one_noop(xhci))
+ xhci_ring_cmd_db(xhci);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+
+ if (!xhci->zombie)
+ mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ);
+ else
+ xhci_dbg(xhci, "Quit polling the event ring.\n");
+}
+#endif
+
+/*
* Start the HC after it was halted.
*
* This function is called by the USB core when the HC driver is added.
int xhci_run(struct usb_hcd *hcd)
{
u32 temp;
+ u64 temp_64;
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
- xhci_dbg(xhci, "xhci_run\n");
+ void (*doorbell)(struct xhci_hcd *) = NULL;
+
+ hcd->uses_new_polling = 1;
+ hcd->poll_rh = 0;
+ xhci_dbg(xhci, "xhci_run\n");
#if 0 /* FIXME: MSI not setup yet */
/* Do this at the very last minute */
ret = xhci_setup_msix(xhci);
return -ENOSYS;
#endif
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+ init_timer(&xhci->event_ring_timer);
+ xhci->event_ring_timer.data = (unsigned long) xhci;
+ xhci->event_ring_timer.function = xhci_event_ring_work;
+ /* Poll the event ring */
+ xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ;
+ xhci->zombie = 0;
+ xhci_dbg(xhci, "Setting event ring polling timer\n");
+ add_timer(&xhci->event_ring_timer);
+#endif
+
+ xhci_dbg(xhci, "Command ring memory map follows:\n");
+ xhci_debug_ring(xhci, xhci->cmd_ring);
+ xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
+ xhci_dbg_cmd_ptrs(xhci);
+
+ xhci_dbg(xhci, "ERST memory map follows:\n");
+ xhci_dbg_erst(xhci, &xhci->erst);
+ xhci_dbg(xhci, "Event ring:\n");
+ xhci_debug_ring(xhci, xhci->event_ring);
+ xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
+ temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
+ temp_64 &= ~ERST_PTR_MASK;
+ xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
+
xhci_dbg(xhci, "// Set the interrupt modulation register\n");
temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
- temp &= 0xffff;
+ temp &= ~ER_IRQ_INTERVAL_MASK;
temp |= (u32) 160;
xhci_writel(xhci, temp, &xhci->ir_set->irq_control);
xhci_writel(xhci, temp, &xhci->op_regs->command);
temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
- xhci_dbg(xhci, "// Enabling event ring interrupter 0x%x"
- " by writing 0x%x to irq_pending\n",
- (unsigned int) xhci->ir_set,
- (unsigned int) ER_IRQ_ENABLE(temp));
+ xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n",
+ xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
xhci_writel(xhci, ER_IRQ_ENABLE(temp),
&xhci->ir_set->irq_pending);
xhci_print_ir_set(xhci, xhci->ir_set, 0);
- xhci_dbg(xhci, "Command ring memory map follows:\n");
- xhci_debug_ring(xhci, xhci->cmd_ring);
- xhci_dbg(xhci, "ERST memory map follows:\n");
- xhci_dbg_erst(xhci, &xhci->erst);
+ if (NUM_TEST_NOOPS > 0)
+ doorbell = xhci_setup_one_noop(xhci);
temp = xhci_readl(xhci, &xhci->op_regs->command);
temp |= (CMD_RUN);
xhci_writel(xhci, temp, &xhci->op_regs->command);
/* Flush PCI posted writes */
temp = xhci_readl(xhci, &xhci->op_regs->command);
- xhci_dbg(xhci, "// @%x = 0x%x\n",
- (unsigned int) &xhci->op_regs->command, temp);
+ xhci_dbg(xhci, "// @%p = 0x%x\n", &xhci->op_regs->command, temp);
+ if (doorbell)
+ (*doorbell)(xhci);
xhci_dbg(xhci, "Finished xhci_run\n");
return 0;
#if 0 /* No MSI yet */
xhci_cleanup_msix(xhci);
#endif
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+ /* Tell the event ring poll function not to reschedule */
+ xhci->zombie = 1;
+ del_timer_sync(&xhci->event_ring_timer);
+#endif
+
xhci_dbg(xhci, "// Disabling event ring interrupts\n");
temp = xhci_readl(xhci, &xhci->op_regs->status);
xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
xhci_readl(xhci, &xhci->op_regs->status));
}
+/*-------------------------------------------------------------------------*/
+
+/**
+ * xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and
+ * HCDs. Find the index for an endpoint given its descriptor. Use the return
+ * value to right shift 1 for the bitmask.
+ *
+ * Index = (epnum * 2) + direction - 1,
+ * where direction = 0 for OUT, 1 for IN.
+ * For control endpoints, the IN index is used (OUT index is unused), so
+ * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
+ */
+unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc)
+{
+ unsigned int index;
+ if (usb_endpoint_xfer_control(desc))
+ index = (unsigned int) (usb_endpoint_num(desc)*2);
+ else
+ index = (unsigned int) (usb_endpoint_num(desc)*2) +
+ (usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
+ return index;
+}
+
+/* Find the flag for this endpoint (for use in the control context). Use the
+ * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
+ * bit 1, etc.
+ */
+unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc)
+{
+ return 1 << (xhci_get_endpoint_index(desc) + 1);
+}
+
+/* Compute the last valid endpoint context index. Basically, this is the
+ * endpoint index plus one. For slot contexts with more than valid endpoint,
+ * we find the most significant bit set in the added contexts flags.
+ * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
+ * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
+ */
+static inline unsigned int xhci_last_valid_endpoint(u32 added_ctxs)
+{
+ return fls(added_ctxs) - 1;
+}
+
+/* Returns 1 if the arguments are OK;
+ * returns 0 this is a root hub; returns -EINVAL for NULL pointers.
+ */
+int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev,
+ struct usb_host_endpoint *ep, int check_ep, const char *func) {
+ if (!hcd || (check_ep && !ep) || !udev) {
+ printk(KERN_DEBUG "xHCI %s called with invalid args\n",
+ func);
+ return -EINVAL;
+ }
+ if (!udev->parent) {
+ printk(KERN_DEBUG "xHCI %s called for root hub\n",
+ func);
+ return 0;
+ }
+ if (!udev->slot_id) {
+ printk(KERN_DEBUG "xHCI %s called with unaddressed device\n",
+ func);
+ return -EINVAL;
+ }
+ return 1;
+}
+
+/*
+ * non-error returns are a promise to giveback() the urb later
+ * we drop ownership so next owner (or urb unlink) can get it
+ */
+int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
+{
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ unsigned long flags;
+ int ret = 0;
+ unsigned int slot_id, ep_index;
+
+ if (!urb || xhci_check_args(hcd, urb->dev, urb->ep, true, __func__) <= 0)
+ return -EINVAL;
+
+ slot_id = urb->dev->slot_id;
+ ep_index = xhci_get_endpoint_index(&urb->ep->desc);
+
+ spin_lock_irqsave(&xhci->lock, flags);
+ if (!xhci->devs || !xhci->devs[slot_id]) {
+ if (!in_interrupt())
+ dev_warn(&urb->dev->dev, "WARN: urb submitted for dev with no Slot ID\n");
+ ret = -EINVAL;
+ goto exit;
+ }
+ if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
+ if (!in_interrupt())
+ xhci_dbg(xhci, "urb submitted during PCI suspend\n");
+ ret = -ESHUTDOWN;
+ goto exit;
+ }
+ if (usb_endpoint_xfer_control(&urb->ep->desc))
+ /* We have a spinlock and interrupts disabled, so we must pass
+ * atomic context to this function, which may allocate memory.
+ */
+ ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,
+ slot_id, ep_index);
+ else if (usb_endpoint_xfer_bulk(&urb->ep->desc))
+ ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
+ slot_id, ep_index);
+ else
+ ret = -EINVAL;
+exit:
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ return ret;
+}
+
+/*
+ * Remove the URB's TD from the endpoint ring. This may cause the HC to stop
+ * USB transfers, potentially stopping in the middle of a TRB buffer. The HC
+ * should pick up where it left off in the TD, unless a Set Transfer Ring
+ * Dequeue Pointer is issued.
+ *
+ * The TRBs that make up the buffers for the canceled URB will be "removed" from
+ * the ring. Since the ring is a contiguous structure, they can't be physically
+ * removed. Instead, there are two options:
+ *
+ * 1) If the HC is in the middle of processing the URB to be canceled, we
+ * simply move the ring's dequeue pointer past those TRBs using the Set
+ * Transfer Ring Dequeue Pointer command. This will be the common case,
+ * when drivers timeout on the last submitted URB and attempt to cancel.
+ *
+ * 2) If the HC is in the middle of a different TD, we turn the TRBs into a
+ * series of 1-TRB transfer no-op TDs. (No-ops shouldn't be chained.) The
+ * HC will need to invalidate the any TRBs it has cached after the stop
+ * endpoint command, as noted in the xHCI 0.95 errata.
+ *
+ * 3) The TD may have completed by the time the Stop Endpoint Command
+ * completes, so software needs to handle that case too.
+ *
+ * This function should protect against the TD enqueueing code ringing the
+ * doorbell while this code is waiting for a Stop Endpoint command to complete.
+ * It also needs to account for multiple cancellations on happening at the same
+ * time for the same endpoint.
+ *
+ * Note that this function can be called in any context, or so says
+ * usb_hcd_unlink_urb()
+ */
+int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
+{
+ unsigned long flags;
+ int ret;
+ struct xhci_hcd *xhci;
+ struct xhci_td *td;
+ unsigned int ep_index;
+ struct xhci_ring *ep_ring;
+
+ xhci = hcd_to_xhci(hcd);
+ spin_lock_irqsave(&xhci->lock, flags);
+ /* Make sure the URB hasn't completed or been unlinked already */
+ ret = usb_hcd_check_unlink_urb(hcd, urb, status);
+ if (ret || !urb->hcpriv)
+ goto done;
+
+ xhci_dbg(xhci, "Cancel URB %p\n", urb);
+ xhci_dbg(xhci, "Event ring:\n");
+ xhci_debug_ring(xhci, xhci->event_ring);
+ ep_index = xhci_get_endpoint_index(&urb->ep->desc);
+ ep_ring = xhci->devs[urb->dev->slot_id]->ep_rings[ep_index];
+ xhci_dbg(xhci, "Endpoint ring:\n");
+ xhci_debug_ring(xhci, ep_ring);
+ td = (struct xhci_td *) urb->hcpriv;
+
+ ep_ring->cancels_pending++;
+ list_add_tail(&td->cancelled_td_list, &ep_ring->cancelled_td_list);
+ /* Queue a stop endpoint command, but only if this is
+ * the first cancellation to be handled.
+ */
+ if (ep_ring->cancels_pending == 1) {
+ xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index);
+ xhci_ring_cmd_db(xhci);
+ }
+done:
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ return ret;
+}
+
+/* Drop an endpoint from a new bandwidth configuration for this device.
+ * Only one call to this function is allowed per endpoint before
+ * check_bandwidth() or reset_bandwidth() must be called.
+ * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
+ * add the endpoint to the schedule with possibly new parameters denoted by a
+ * different endpoint descriptor in usb_host_endpoint.
+ * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
+ * not allowed.
+ *
+ * The USB core will not allow URBs to be queued to an endpoint that is being
+ * disabled, so there's no need for mutual exclusion to protect
+ * the xhci->devs[slot_id] structure.
+ */
+int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
+ struct usb_host_endpoint *ep)
+{
+ struct xhci_hcd *xhci;
+ struct xhci_container_ctx *in_ctx, *out_ctx;
+ struct xhci_input_control_ctx *ctrl_ctx;
+ struct xhci_slot_ctx *slot_ctx;
+ unsigned int last_ctx;
+ unsigned int ep_index;
+ struct xhci_ep_ctx *ep_ctx;
+ u32 drop_flag;
+ u32 new_add_flags, new_drop_flags, new_slot_info;
+ int ret;
+
+ ret = xhci_check_args(hcd, udev, ep, 1, __func__);
+ if (ret <= 0)
+ return ret;
+ xhci = hcd_to_xhci(hcd);
+ xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
+
+ drop_flag = xhci_get_endpoint_flag(&ep->desc);
+ if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
+ xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
+ __func__, drop_flag);
+ return 0;
+ }
+
+ if (!xhci->devs || !xhci->devs[udev->slot_id]) {
+ xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ in_ctx = xhci->devs[udev->slot_id]->in_ctx;
+ out_ctx = xhci->devs[udev->slot_id]->out_ctx;
+ ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
+ ep_index = xhci_get_endpoint_index(&ep->desc);
+ ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
+ /* If the HC already knows the endpoint is disabled,
+ * or the HCD has noted it is disabled, ignore this request
+ */
+ if ((ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED ||
+ ctrl_ctx->drop_flags & xhci_get_endpoint_flag(&ep->desc)) {
+ xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
+ __func__, ep);
+ return 0;
+ }
+
+ ctrl_ctx->drop_flags |= drop_flag;
+ new_drop_flags = ctrl_ctx->drop_flags;
+
+ ctrl_ctx->add_flags = ~drop_flag;
+ new_add_flags = ctrl_ctx->add_flags;
+
+ last_ctx = xhci_last_valid_endpoint(ctrl_ctx->add_flags);
+ slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
+ /* Update the last valid endpoint context, if we deleted the last one */
+ if ((slot_ctx->dev_info & LAST_CTX_MASK) > LAST_CTX(last_ctx)) {
+ slot_ctx->dev_info &= ~LAST_CTX_MASK;
+ slot_ctx->dev_info |= LAST_CTX(last_ctx);
+ }
+ new_slot_info = slot_ctx->dev_info;
+
+ xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
+
+ xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
+ (unsigned int) ep->desc.bEndpointAddress,
+ udev->slot_id,
+ (unsigned int) new_drop_flags,
+ (unsigned int) new_add_flags,
+ (unsigned int) new_slot_info);
+ return 0;
+}
+
+/* Add an endpoint to a new possible bandwidth configuration for this device.
+ * Only one call to this function is allowed per endpoint before
+ * check_bandwidth() or reset_bandwidth() must be called.
+ * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
+ * add the endpoint to the schedule with possibly new parameters denoted by a
+ * different endpoint descriptor in usb_host_endpoint.
+ * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
+ * not allowed.
+ *
+ * The USB core will not allow URBs to be queued to an endpoint until the
+ * configuration or alt setting is installed in the device, so there's no need
+ * for mutual exclusion to protect the xhci->devs[slot_id] structure.
+ */
+int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
+ struct usb_host_endpoint *ep)
+{
+ struct xhci_hcd *xhci;
+ struct xhci_container_ctx *in_ctx, *out_ctx;
+ unsigned int ep_index;
+ struct xhci_ep_ctx *ep_ctx;
+ struct xhci_slot_ctx *slot_ctx;
+ struct xhci_input_control_ctx *ctrl_ctx;
+ u32 added_ctxs;
+ unsigned int last_ctx;
+ u32 new_add_flags, new_drop_flags, new_slot_info;
+ int ret = 0;
+
+ ret = xhci_check_args(hcd, udev, ep, 1, __func__);
+ if (ret <= 0) {
+ /* So we won't queue a reset ep command for a root hub */
+ ep->hcpriv = NULL;
+ return ret;
+ }
+ xhci = hcd_to_xhci(hcd);
+
+ added_ctxs = xhci_get_endpoint_flag(&ep->desc);
+ last_ctx = xhci_last_valid_endpoint(added_ctxs);
+ if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
+ /* FIXME when we have to issue an evaluate endpoint command to
+ * deal with ep0 max packet size changing once we get the
+ * descriptors
+ */
+ xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
+ __func__, added_ctxs);
+ return 0;
+ }
+
+ if (!xhci->devs || !xhci->devs[udev->slot_id]) {
+ xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ in_ctx = xhci->devs[udev->slot_id]->in_ctx;
+ out_ctx = xhci->devs[udev->slot_id]->out_ctx;
+ ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
+ ep_index = xhci_get_endpoint_index(&ep->desc);
+ ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
+ /* If the HCD has already noted the endpoint is enabled,
+ * ignore this request.
+ */
+ if (ctrl_ctx->add_flags & xhci_get_endpoint_flag(&ep->desc)) {
+ xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
+ __func__, ep);
+ return 0;
+ }
+
+ /*
+ * Configuration and alternate setting changes must be done in
+ * process context, not interrupt context (or so documenation
+ * for usb_set_interface() and usb_set_configuration() claim).
+ */
+ if (xhci_endpoint_init(xhci, xhci->devs[udev->slot_id],
+ udev, ep, GFP_KERNEL) < 0) {
+ dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
+ __func__, ep->desc.bEndpointAddress);
+ return -ENOMEM;
+ }
+
+ ctrl_ctx->add_flags |= added_ctxs;
+ new_add_flags = ctrl_ctx->add_flags;
+
+ /* If xhci_endpoint_disable() was called for this endpoint, but the
+ * xHC hasn't been notified yet through the check_bandwidth() call,
+ * this re-adds a new state for the endpoint from the new endpoint
+ * descriptors. We must drop and re-add this endpoint, so we leave the
+ * drop flags alone.
+ */
+ new_drop_flags = ctrl_ctx->drop_flags;
+
+ slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
+ /* Update the last valid endpoint context, if we just added one past */
+ if ((slot_ctx->dev_info & LAST_CTX_MASK) < LAST_CTX(last_ctx)) {
+ slot_ctx->dev_info &= ~LAST_CTX_MASK;
+ slot_ctx->dev_info |= LAST_CTX(last_ctx);
+ }
+ new_slot_info = slot_ctx->dev_info;
+
+ /* Store the usb_device pointer for later use */
+ ep->hcpriv = udev;
+
+ xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
+ (unsigned int) ep->desc.bEndpointAddress,
+ udev->slot_id,
+ (unsigned int) new_drop_flags,
+ (unsigned int) new_add_flags,
+ (unsigned int) new_slot_info);
+ return 0;
+}
+
+static void xhci_zero_in_ctx(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev)
+{
+ struct xhci_input_control_ctx *ctrl_ctx;
+ struct xhci_ep_ctx *ep_ctx;
+ struct xhci_slot_ctx *slot_ctx;
+ int i;
+
+ /* When a device's add flag and drop flag are zero, any subsequent
+ * configure endpoint command will leave that endpoint's state
+ * untouched. Make sure we don't leave any old state in the input
+ * endpoint contexts.
+ */
+ ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
+ ctrl_ctx->drop_flags = 0;
+ ctrl_ctx->add_flags = 0;
+ slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
+ slot_ctx->dev_info &= ~LAST_CTX_MASK;
+ /* Endpoint 0 is always valid */
+ slot_ctx->dev_info |= LAST_CTX(1);
+ for (i = 1; i < 31; ++i) {
+ ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, i);
+ ep_ctx->ep_info = 0;
+ ep_ctx->ep_info2 = 0;
+ ep_ctx->deq = 0;
+ ep_ctx->tx_info = 0;
+ }
+}
+
+/* Called after one or more calls to xhci_add_endpoint() or
+ * xhci_drop_endpoint(). If this call fails, the USB core is expected
+ * to call xhci_reset_bandwidth().
+ *
+ * Since we are in the middle of changing either configuration or
+ * installing a new alt setting, the USB core won't allow URBs to be
+ * enqueued for any endpoint on the old config or interface. Nothing
+ * else should be touching the xhci->devs[slot_id] structure, so we
+ * don't need to take the xhci->lock for manipulating that.
+ */
+int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
+{
+ int i;
+ int ret = 0;
+ int timeleft;
+ unsigned long flags;
+ struct xhci_hcd *xhci;
+ struct xhci_virt_device *virt_dev;
+ struct xhci_input_control_ctx *ctrl_ctx;
+ struct xhci_slot_ctx *slot_ctx;
+
+ ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
+ if (ret <= 0)
+ return ret;
+ xhci = hcd_to_xhci(hcd);
+
+ if (!udev->slot_id || !xhci->devs || !xhci->devs[udev->slot_id]) {
+ xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
+ __func__);
+ return -EINVAL;
+ }
+ xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
+ virt_dev = xhci->devs[udev->slot_id];
+
+ /* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */
+ ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
+ ctrl_ctx->add_flags |= SLOT_FLAG;
+ ctrl_ctx->add_flags &= ~EP0_FLAG;
+ ctrl_ctx->drop_flags &= ~SLOT_FLAG;
+ ctrl_ctx->drop_flags &= ~EP0_FLAG;
+ xhci_dbg(xhci, "New Input Control Context:\n");
+ slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
+ xhci_dbg_ctx(xhci, virt_dev->in_ctx,
+ LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
+
+ spin_lock_irqsave(&xhci->lock, flags);
+ ret = xhci_queue_configure_endpoint(xhci, virt_dev->in_ctx->dma,
+ udev->slot_id);
+ if (ret < 0) {
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
+ return -ENOMEM;
+ }
+ xhci_ring_cmd_db(xhci);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+
+ /* Wait for the configure endpoint command to complete */
+ timeleft = wait_for_completion_interruptible_timeout(
+ &virt_dev->cmd_completion,
+ USB_CTRL_SET_TIMEOUT);
+ if (timeleft <= 0) {
+ xhci_warn(xhci, "%s while waiting for configure endpoint command\n",
+ timeleft == 0 ? "Timeout" : "Signal");
+ /* FIXME cancel the configure endpoint command */
+ return -ETIME;
+ }
+
+ switch (virt_dev->cmd_status) {
+ case COMP_ENOMEM:
+ dev_warn(&udev->dev, "Not enough host controller resources "
+ "for new device state.\n");
+ ret = -ENOMEM;
+ /* FIXME: can we allocate more resources for the HC? */
+ break;
+ case COMP_BW_ERR:
+ dev_warn(&udev->dev, "Not enough bandwidth "
+ "for new device state.\n");
+ ret = -ENOSPC;
+ /* FIXME: can we go back to the old state? */
+ break;
+ case COMP_TRB_ERR:
+ /* the HCD set up something wrong */
+ dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, add flag = 1, "
+ "and endpoint is not disabled.\n");
+ ret = -EINVAL;
+ break;
+ case COMP_SUCCESS:
+ dev_dbg(&udev->dev, "Successful Endpoint Configure command\n");
+ break;
+ default:
+ xhci_err(xhci, "ERROR: unexpected command completion "
+ "code 0x%x.\n", virt_dev->cmd_status);
+ ret = -EINVAL;
+ break;
+ }
+ if (ret) {
+ /* Callee should call reset_bandwidth() */
+ return ret;
+ }
+
+ xhci_dbg(xhci, "Output context after successful config ep cmd:\n");
+ xhci_dbg_ctx(xhci, virt_dev->out_ctx,
+ LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
+
+ xhci_zero_in_ctx(xhci, virt_dev);
+ /* Free any old rings */
+ for (i = 1; i < 31; ++i) {
+ if (virt_dev->new_ep_rings[i]) {
+ xhci_ring_free(xhci, virt_dev->ep_rings[i]);
+ virt_dev->ep_rings[i] = virt_dev->new_ep_rings[i];
+ virt_dev->new_ep_rings[i] = NULL;
+ }
+ }
+
+ return ret;
+}
+
+void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
+{
+ struct xhci_hcd *xhci;
+ struct xhci_virt_device *virt_dev;
+ int i, ret;
+
+ ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
+ if (ret <= 0)
+ return;
+ xhci = hcd_to_xhci(hcd);
+
+ if (!xhci->devs || !xhci->devs[udev->slot_id]) {
+ xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
+ __func__);
+ return;
+ }
+ xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
+ virt_dev = xhci->devs[udev->slot_id];
+ /* Free any rings allocated for added endpoints */
+ for (i = 0; i < 31; ++i) {
+ if (virt_dev->new_ep_rings[i]) {
+ xhci_ring_free(xhci, virt_dev->new_ep_rings[i]);
+ virt_dev->new_ep_rings[i] = NULL;
+ }
+ }
+ xhci_zero_in_ctx(xhci, virt_dev);
+}
+
+/* Deal with stalled endpoints. The core should have sent the control message
+ * to clear the halt condition. However, we need to make the xHCI hardware
+ * reset its sequence number, since a device will expect a sequence number of
+ * zero after the halt condition is cleared.
+ * Context: in_interrupt
+ */
+void xhci_endpoint_reset(struct usb_hcd *hcd,
+ struct usb_host_endpoint *ep)
+{
+ struct xhci_hcd *xhci;
+ struct usb_device *udev;
+ unsigned int ep_index;
+ unsigned long flags;
+ int ret;
+ struct xhci_dequeue_state deq_state;
+ struct xhci_ring *ep_ring;
+
+ xhci = hcd_to_xhci(hcd);
+ udev = (struct usb_device *) ep->hcpriv;
+ /* Called with a root hub endpoint (or an endpoint that wasn't added
+ * with xhci_add_endpoint()
+ */
+ if (!ep->hcpriv)
+ return;
+ ep_index = xhci_get_endpoint_index(&ep->desc);
+ ep_ring = xhci->devs[udev->slot_id]->ep_rings[ep_index];
+ if (!ep_ring->stopped_td) {
+ xhci_dbg(xhci, "Endpoint 0x%x not halted, refusing to reset.\n",
+ ep->desc.bEndpointAddress);
+ return;
+ }
+
+ xhci_dbg(xhci, "Queueing reset endpoint command\n");
+ spin_lock_irqsave(&xhci->lock, flags);
+ ret = xhci_queue_reset_ep(xhci, udev->slot_id, ep_index);
+ /*
+ * Can't change the ring dequeue pointer until it's transitioned to the
+ * stopped state, which is only upon a successful reset endpoint
+ * command. Better hope that last command worked!
+ */
+ if (!ret) {
+ xhci_dbg(xhci, "Cleaning up stalled endpoint ring\n");
+ /* We need to move the HW's dequeue pointer past this TD,
+ * or it will attempt to resend it on the next doorbell ring.
+ */
+ xhci_find_new_dequeue_state(xhci, udev->slot_id,
+ ep_index, ep_ring->stopped_td, &deq_state);
+ xhci_dbg(xhci, "Queueing new dequeue state\n");
+ xhci_queue_new_dequeue_state(xhci, ep_ring,
+ udev->slot_id,
+ ep_index, &deq_state);
+ kfree(ep_ring->stopped_td);
+ xhci_ring_cmd_db(xhci);
+ }
+ spin_unlock_irqrestore(&xhci->lock, flags);
+
+ if (ret)
+ xhci_warn(xhci, "FIXME allocate a new ring segment\n");
+}
+
+/*
+ * At this point, the struct usb_device is about to go away, the device has
+ * disconnected, and all traffic has been stopped and the endpoints have been
+ * disabled. Free any HC data structures associated with that device.
+ */
+void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
+{
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ unsigned long flags;
+
+ if (udev->slot_id == 0)
+ return;
+
+ spin_lock_irqsave(&xhci->lock, flags);
+ if (xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) {
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
+ return;
+ }
+ xhci_ring_cmd_db(xhci);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ /*
+ * Event command completion handler will free any data structures
+ * associated with the slot. XXX Can free sleep?
+ */
+}
+
+/*
+ * Returns 0 if the xHC ran out of device slots, the Enable Slot command
+ * timed out, or allocating memory failed. Returns 1 on success.
+ */
+int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
+{
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ unsigned long flags;
+ int timeleft;
+ int ret;
+
+ spin_lock_irqsave(&xhci->lock, flags);
+ ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0);
+ if (ret) {
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
+ return 0;
+ }
+ xhci_ring_cmd_db(xhci);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+
+ /* XXX: how much time for xHC slot assignment? */
+ timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
+ USB_CTRL_SET_TIMEOUT);
+ if (timeleft <= 0) {
+ xhci_warn(xhci, "%s while waiting for a slot\n",
+ timeleft == 0 ? "Timeout" : "Signal");
+ /* FIXME cancel the enable slot request */
+ return 0;
+ }
+
+ if (!xhci->slot_id) {
+ xhci_err(xhci, "Error while assigning device slot ID\n");
+ return 0;
+ }
+ /* xhci_alloc_virt_device() does not touch rings; no need to lock */
+ if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_KERNEL)) {
+ /* Disable slot, if we can do it without mem alloc */
+ xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
+ spin_lock_irqsave(&xhci->lock, flags);
+ if (!xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id))
+ xhci_ring_cmd_db(xhci);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ return 0;
+ }
+ udev->slot_id = xhci->slot_id;
+ /* Is this a LS or FS device under a HS hub? */
+ /* Hub or peripherial? */
+ return 1;
+}
+
+/*
+ * Issue an Address Device command (which will issue a SetAddress request to
+ * the device).
+ * We should be protected by the usb_address0_mutex in khubd's hub_port_init, so
+ * we should only issue and wait on one address command at the same time.
+ *
+ * We add one to the device address issued by the hardware because the USB core
+ * uses address 1 for the root hubs (even though they're not really devices).
+ */
+int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
+{
+ unsigned long flags;
+ int timeleft;
+ struct xhci_virt_device *virt_dev;
+ int ret = 0;
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ struct xhci_slot_ctx *slot_ctx;
+ struct xhci_input_control_ctx *ctrl_ctx;
+ u64 temp_64;
+
+ if (!udev->slot_id) {
+ xhci_dbg(xhci, "Bad Slot ID %d\n", udev->slot_id);
+ return -EINVAL;
+ }
+
+ virt_dev = xhci->devs[udev->slot_id];
+
+ /* If this is a Set Address to an unconfigured device, setup ep 0 */
+ if (!udev->config)
+ xhci_setup_addressable_virt_dev(xhci, udev);
+ /* Otherwise, assume the core has the device configured how it wants */
+ xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
+ xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
+
+ spin_lock_irqsave(&xhci->lock, flags);
+ ret = xhci_queue_address_device(xhci, virt_dev->in_ctx->dma,
+ udev->slot_id);
+ if (ret) {
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
+ return ret;
+ }
+ xhci_ring_cmd_db(xhci);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+
+ /* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */
+ timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
+ USB_CTRL_SET_TIMEOUT);
+ /* FIXME: From section 4.3.4: "Software shall be responsible for timing
+ * the SetAddress() "recovery interval" required by USB and aborting the
+ * command on a timeout.
+ */
+ if (timeleft <= 0) {
+ xhci_warn(xhci, "%s while waiting for a slot\n",
+ timeleft == 0 ? "Timeout" : "Signal");
+ /* FIXME cancel the address device command */
+ return -ETIME;
+ }
+
+ switch (virt_dev->cmd_status) {
+ case COMP_CTX_STATE:
+ case COMP_EBADSLT:
+ xhci_err(xhci, "Setup ERROR: address device command for slot %d.\n",
+ udev->slot_id);
+ ret = -EINVAL;
+ break;
+ case COMP_TX_ERR:
+ dev_warn(&udev->dev, "Device not responding to set address.\n");
+ ret = -EPROTO;
+ break;
+ case COMP_SUCCESS:
+ xhci_dbg(xhci, "Successful Address Device command\n");
+ break;
+ default:
+ xhci_err(xhci, "ERROR: unexpected command completion "
+ "code 0x%x.\n", virt_dev->cmd_status);
+ xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
+ xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
+ ret = -EINVAL;
+ break;
+ }
+ if (ret) {
+ return ret;
+ }
+ temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
+ xhci_dbg(xhci, "Op regs DCBAA ptr = %#016llx\n", temp_64);
+ xhci_dbg(xhci, "Slot ID %d dcbaa entry @%p = %#016llx\n",
+ udev->slot_id,
+ &xhci->dcbaa->dev_context_ptrs[udev->slot_id],
+ (unsigned long long)
+ xhci->dcbaa->dev_context_ptrs[udev->slot_id]);
+ xhci_dbg(xhci, "Output Context DMA address = %#08llx\n",
+ (unsigned long long)virt_dev->out_ctx->dma);
+ xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
+ xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
+ xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
+ xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
+ /*
+ * USB core uses address 1 for the roothubs, so we add one to the
+ * address given back to us by the HC.
+ */
+ slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
+ udev->devnum = (slot_ctx->dev_state & DEV_ADDR_MASK) + 1;
+ /* Zero the input context control for later use */
+ ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
+ ctrl_ctx->add_flags = 0;
+ ctrl_ctx->drop_flags = 0;
+
+ xhci_dbg(xhci, "Device address = %d\n", udev->devnum);
+ /* XXX Meh, not sure if anyone else but choose_address uses this. */
+ set_bit(udev->devnum, udev->bus->devmap.devicemap);
+
+ return 0;
+}
+
int xhci_get_frame(struct usb_hcd *hcd)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
return retval;
}
#endif
+ /*
+ * Check the compiler generated sizes of structures that must be laid
+ * out in specific ways for hardware access.
+ */
+ BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
+ BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8);
+ BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8);
+ /* xhci_device_control has eight fields, and also
+ * embeds one xhci_slot_ctx and 31 xhci_ep_ctx
+ */
+ BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8);
+ BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8);
+ BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8);
+ BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 7*32/8);
+ BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
+ /* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
+ BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
+ BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
return 0;
}
module_init(xhci_hcd_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff