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path: root/drivers/usb/host/xhci-hcd.c
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Diffstat (limited to 'drivers/usb/host/xhci-hcd.c')
-rw-r--r--drivers/usb/host/xhci-hcd.c152
1 files changed, 151 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci-hcd.c b/drivers/usb/host/xhci-hcd.c
index 011f4781066..a99c119e9fd 100644
--- a/drivers/usb/host/xhci-hcd.c
+++ b/drivers/usb/host/xhci-hcd.c
@@ -218,6 +218,120 @@ int xhci_init(struct usb_hcd *hcd)
}
/*
+ * 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;
+
+ /*
+ * 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 */
+ handle_event(xhci);
+
+ /* Clear the event handler busy flag; the event ring should be empty. */
+ temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
+ xhci_writel(xhci, temp & ~ERST_EHB, &xhci->ir_set->erst_dequeue[0]);
+ /* 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;
+
+ spin_lock(&xhci->lock);
+ /* 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 & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
+ spin_unlock(&xhci->lock);
+ return IRQ_NONE;
+ }
+
+ temp = xhci_readl(xhci, &xhci->op_regs->status);
+ if (temp & STS_FATAL) {
+ xhci_warn(xhci, "WARNING: Host System Error\n");
+ xhci_halt(xhci);
+ xhci_to_hcd(xhci)->state = HC_STATE_HALT;
+ return -ESHUTDOWN;
+ }
+
+ xhci_work(xhci);
+ spin_unlock(&xhci->lock);
+
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+void event_ring_work(unsigned long arg)
+{
+ unsigned long flags;
+ int temp;
+ 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 = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
+ temp &= ERST_PTR_MASK;
+ xhci_dbg(xhci, "ERST deq = 0x%x\n", temp);
+ 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);
+
+ if (xhci->noops_submitted != NUM_TEST_NOOPS)
+ if (setup_one_noop(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.
@@ -233,8 +347,9 @@ int xhci_run(struct usb_hcd *hcd)
{
u32 temp;
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
- xhci_dbg(xhci, "xhci_run\n");
+ void (*doorbell)(struct xhci_hcd *) = NULL;
+ 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);
@@ -243,6 +358,17 @@ int xhci_run(struct usb_hcd *hcd)
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 = 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, "// Set the interrupt modulation register\n");
temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
temp &= 0xffff;
@@ -266,10 +392,24 @@ int xhci_run(struct usb_hcd *hcd)
&xhci->ir_set->irq_pending);
xhci_print_ir_set(xhci, xhci->ir_set, 0);
+ if (NUM_TEST_NOOPS > 0)
+ doorbell = setup_one_noop(xhci);
+
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 = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[1]);
+ xhci_dbg(xhci, "ERST deq upper = 0x%x\n", temp);
+ temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
+ temp &= ERST_PTR_MASK;
+ xhci_dbg(xhci, "ERST deq = 0x%x\n", temp);
temp = xhci_readl(xhci, &xhci->op_regs->command);
temp |= (CMD_RUN);
@@ -280,6 +420,8 @@ int xhci_run(struct usb_hcd *hcd)
temp = xhci_readl(xhci, &xhci->op_regs->command);
xhci_dbg(xhci, "// @%x = 0x%x\n",
(unsigned int) &xhci->op_regs->command, temp);
+ if (doorbell)
+ (*doorbell)(xhci);
xhci_dbg(xhci, "Finished xhci_run\n");
return 0;
@@ -309,6 +451,12 @@ void xhci_stop(struct usb_hcd *hcd)
#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);
@@ -346,6 +494,8 @@ void xhci_shutdown(struct usb_hcd *hcd)
xhci_readl(xhci, &xhci->op_regs->status));
}
+/*-------------------------------------------------------------------------*/
+
int xhci_get_frame(struct usb_hcd *hcd)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-24 05:24:12 +0000