diff options
Diffstat (limited to 'drivers/usb/host/xhci-hcd.c')
| -rw-r--r-- | drivers/usb/host/xhci-hcd.c | 152 |
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); 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