/* * xHCI host controller driver * * Copyright (C) 2008 Intel Corp. * * Author: Sarah Sharp * Some code borrowed from the Linux EHCI driver. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include "xhci.h" #define DRIVER_AUTHOR "Sarah Sharp" #define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver" /* TODO: copied from ehci-hcd.c - can this be refactored? */ /* * handshake - spin reading hc until handshake completes or fails * @ptr: address of hc register to be read * @mask: bits to look at in result of read * @done: value of those bits when handshake succeeds * @usec: timeout in microseconds * * Returns negative errno, or zero on success * * Success happens when the "mask" bits have the specified value (hardware * handshake done). There are two failure modes: "usec" have passed (major * hardware flakeout), or the register reads as all-ones (hardware removed). */ static int handshake(struct xhci_hcd *xhci, void __iomem *ptr, u32 mask, u32 done, int usec) { u32 result; do { result = xhci_readl(xhci, ptr); if (result == ~(u32)0) /* card removed */ return -ENODEV; result &= mask; if (result == done) return 0; udelay(1); usec--; } while (usec > 0); return -ETIMEDOUT; } /* * Force HC into halt state. * * Disable any IRQs and clear the run/stop bit. * HC will complete any current and actively pipelined transactions, and * should halt within 16 microframes of the run/stop bit being cleared. * Read HC Halted bit in the status register to see when the HC is finished. * XXX: shouldn't we set HC_STATE_HALT here somewhere? */ int xhci_halt(struct xhci_hcd *xhci) { u32 halted; u32 cmd; u32 mask; xhci_dbg(xhci, "// Halt the HC\n"); /* Disable all interrupts from the host controller */ mask = ~(XHCI_IRQS); halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT; if (!halted) mask &= ~CMD_RUN; cmd = xhci_readl(xhci, &xhci->op_regs->command); cmd &= mask; xhci_writel(xhci, cmd, &xhci->op_regs->command); return handshake(xhci, &xhci->op_regs->status, STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC); } /* * Reset a halted HC, and set the internal HC state to HC_STATE_HALT. * * This resets pipelines, timers, counters, state machines, etc. * Transactions will be terminated immediately, and operational registers * will be set to their defaults. */ int xhci_reset(struct xhci_hcd *xhci) { u32 command; u32 state; state = xhci_readl(xhci, &xhci->op_regs->status); BUG_ON((state & STS_HALT) == 0); xhci_dbg(xhci, "// Reset the HC\n"); command = xhci_readl(xhci, &xhci->op_regs->command); command |= CMD_RESET; xhci_writel(xhci, command, &xhci->op_regs->command); /* XXX: Why does EHCI set this here? Shouldn't other code do this? */ xhci_to_hcd(xhci)->state = HC_STATE_HALT; return handshake(xhci, &xhci->op_regs->command, CMD_RESET, 0, 250 * 1000); } /* * Stop the HC from processing the endpoint queues. */ static void xhci_quiesce(struct xhci_hcd *xhci) { /* * Queues are per endpoint, so we need to disable an endpoint or slot. * * To disable a slot, we need to insert a disable slot command on the * command ring and ring the doorbell. This will also free any internal * resources associated with the slot (which might not be what we want). * * A Release Endpoint command sounds better - doesn't free internal HC * memory, but removes the endpoints from the schedule and releases the * bandwidth, disables the doorbells, and clears the endpoint enable * flag. Usually used prior to a set interface command. * * TODO: Implement after command ring code is done. */ BUG_ON(!HC_IS_RUNNING(xhci_to_hcd(xhci)->state)); xhci_dbg(xhci, "Finished quiescing -- code not written yet\n"); } #if 0 /* Set up MSI-X table for entry 0 (may claim other entries later) */ static int xhci_setup_msix(struct xhci_hcd *xhci) { int ret; struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); xhci->msix_count = 0; /* XXX: did I do this right? ixgbe does kcalloc for more than one */ xhci->msix_entries = kmalloc(sizeof(struct msix_entry), GFP_KERNEL); if (!xhci->msix_entries) { xhci_err(xhci, "Failed to allocate MSI-X entries\n"); return -ENOMEM; } xhci->msix_entries[0].entry = 0; ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count); if (ret) { xhci_err(xhci, "Failed to enable MSI-X\n"); goto free_entries; } /* * Pass the xhci pointer value as the request_irq "cookie". * If more irqs are added, this will need to be unique for each one. */ ret = request_irq(xhci->msix_entries[0].vector, &xhci_irq, 0, "xHCI", xhci_to_hcd(xhci)); if (ret) { xhci_err(xhci, "Failed to allocate MSI-X interrupt\n"); goto disable_msix; } xhci_dbg(xhci, "Finished setting up MSI-X\n"); return 0; disable_msix: pci_disable_msix(pdev); free_entries: kfree(xhci->msix_entries); xhci->msix_entries = NULL; return ret; } /* XXX: code duplication; can xhci_setup_msix call this? */ /* Free any IRQs and disable MSI-X */ static void xhci_cleanup_msix(struct xhci_hcd *xhci) { struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); if (!xhci->msix_entries) return; free_irq(xhci->msix_entries[0].vector, xhci); pci_disable_msix(pdev); kfree(xhci->msix_entries); xhci->msix_entries = NULL; xhci_dbg(xhci, "Finished cleaning up MSI-X\n"); } #endif /* * Initialize memory for HCD and xHC (one-time init). * * Program the PAGESIZE register, initialize the device context array, create * device contexts (?), set up a command ring segment (or two?), create event * ring (one for now). */ int xhci_init(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); int retval = 0; xhci_dbg(xhci, "xhci_init\n"); spin_lock_init(&xhci->lock); retval = xhci_mem_init(xhci, GFP_KERNEL); xhci_dbg(xhci, "Finished xhci_init\n"); return retval; } /* * 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 */ xhci_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; } if (temp & STS_FATAL) { xhci_warn(xhci, "WARNING: Host System Error\n"); xhci_halt(xhci); 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; 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); 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. * Its opposite is xhci_stop(). * * xhci_init() must be called once before this function can be called. * Reset the HC, enable device slot contexts, program DCBAAP, and * set command ring pointer and event ring pointer. * * Setup MSI-X vectors and enable interrupts. */ int xhci_run(struct usb_hcd *hcd) { u32 temp; struct xhci_hcd *xhci = hcd_to_xhci(hcd); 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); if (!ret) return ret; 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, "// Set the interrupt modulation register\n"); temp = xhci_readl(xhci, &xhci->ir_set->irq_control); temp &= ~ER_IRQ_INTERVAL_MASK; temp |= (u32) 160; xhci_writel(xhci, temp, &xhci->ir_set->irq_control); /* Set the HCD state before we enable the irqs */ hcd->state = HC_STATE_RUNNING; temp = xhci_readl(xhci, &xhci->op_regs->command); temp |= (CMD_EIE); xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n", temp); xhci_writel(xhci, temp, &xhci->op_regs->command); temp = xhci_readl(xhci, &xhci->ir_set->irq_pending); 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); if (NUM_TEST_NOOPS > 0) doorbell = xhci_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[0]); temp &= ERST_PTR_MASK; xhci_dbg(xhci, "ERST deq = 0x%x\n", temp); 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->op_regs->command); temp |= (CMD_RUN); xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n", temp); xhci_writel(xhci, temp, &xhci->op_regs->command); /* Flush PCI posted writes */ temp = xhci_readl(xhci, &xhci->op_regs->command); 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; } /* * Stop xHCI driver. * * This function is called by the USB core when the HC driver is removed. * Its opposite is xhci_run(). * * Disable device contexts, disable IRQs, and quiesce the HC. * Reset the HC, finish any completed transactions, and cleanup memory. */ void xhci_stop(struct usb_hcd *hcd) { u32 temp; struct xhci_hcd *xhci = hcd_to_xhci(hcd); spin_lock_irq(&xhci->lock); if (HC_IS_RUNNING(hcd->state)) xhci_quiesce(xhci); xhci_halt(xhci); xhci_reset(xhci); spin_unlock_irq(&xhci->lock); #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); temp = xhci_readl(xhci, &xhci->ir_set->irq_pending); xhci_writel(xhci, ER_IRQ_DISABLE(temp), &xhci->ir_set->irq_pending); xhci_print_ir_set(xhci, xhci->ir_set, 0); xhci_dbg(xhci, "cleaning up memory\n"); xhci_mem_cleanup(xhci); xhci_dbg(xhci, "xhci_stop completed - status = %x\n", xhci_readl(xhci, &xhci->op_regs->status)); } /* * Shutdown HC (not bus-specific) * * This is called when the machine is rebooting or halting. We assume that the * machine will be powered off, and the HC's internal state will be reset. * Don't bother to free memory. */ void xhci_shutdown(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); spin_lock_irq(&xhci->lock); xhci_halt(xhci); spin_unlock_irq(&xhci->lock); #if 0 xhci_cleanup_msix(xhci); #endif xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n", 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)) ret = xhci_queue_ctrl_tx(xhci, mem_flags, urb, slot_id, ep_index); else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) ret = xhci_queue_bulk_tx(xhci, mem_flags, 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); ep_index = xhci_get_endpoint_index(&urb->ep->desc); ep_ring = xhci->devs[urb->dev->slot_id]->ep_rings[ep_index]; 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_device_control *in_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; ep_index = xhci_get_endpoint_index(&ep->desc); ep_ctx = &xhci->devs[udev->slot_id]->out_ctx->ep[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 || in_ctx->drop_flags & xhci_get_endpoint_flag(&ep->desc)) { xhci_warn(xhci, "xHCI %s called with disabled ep %p\n", __func__, ep); return 0; } in_ctx->drop_flags |= drop_flag; new_drop_flags = in_ctx->drop_flags; in_ctx->add_flags = ~drop_flag; new_add_flags = in_ctx->add_flags; last_ctx = xhci_last_valid_endpoint(in_ctx->add_flags); /* Update the last valid endpoint context, if we deleted the last one */ if ((in_ctx->slot.dev_info & LAST_CTX_MASK) > LAST_CTX(last_ctx)) { in_ctx->slot.dev_info &= ~LAST_CTX_MASK; in_ctx->slot.dev_info |= LAST_CTX(last_ctx); } new_slot_info = in_ctx->slot.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_device_control *in_ctx; unsigned int ep_index; struct xhci_ep_ctx *ep_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; ep_index = xhci_get_endpoint_index(&ep->desc); ep_ctx = &xhci->devs[udev->slot_id]->out_ctx->ep[ep_index]; /* If the HCD has already noted the endpoint is enabled, * ignore this request. */ if (in_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; } in_ctx->add_flags |= added_ctxs; new_add_flags = in_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 = in_ctx->drop_flags; /* Update the last valid endpoint context, if we just added one past */ if ((in_ctx->slot.dev_info & LAST_CTX_MASK) < LAST_CTX(last_ctx)) { in_ctx->slot.dev_info &= ~LAST_CTX_MASK; in_ctx->slot.dev_info |= LAST_CTX(last_ctx); } new_slot_info = in_ctx->slot.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_virt_device *virt_dev) { struct xhci_ep_ctx *ep_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. */ virt_dev->in_ctx->drop_flags = 0; virt_dev->in_ctx->add_flags = 0; virt_dev->in_ctx->slot.dev_info &= ~LAST_CTX_MASK; /* Endpoint 0 is always valid */ virt_dev->in_ctx->slot.dev_info |= LAST_CTX(1); for (i = 1; i < 31; ++i) { ep_ctx = &virt_dev->in_ctx->ep[i]; ep_ctx->ep_info = 0; ep_ctx->ep_info2 = 0; ep_ctx->deq[0] = 0; ep_ctx->deq[1] = 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; 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 */ virt_dev->in_ctx->add_flags |= SLOT_FLAG; virt_dev->in_ctx->add_flags &= ~EP0_FLAG; virt_dev->in_ctx->drop_flags &= ~SLOT_FLAG; virt_dev->in_ctx->drop_flags &= ~EP0_FLAG; xhci_dbg(xhci, "New Input Control Context:\n"); xhci_dbg_ctx(xhci, virt_dev->in_ctx, virt_dev->in_ctx_dma, LAST_CTX_TO_EP_NUM(virt_dev->in_ctx->slot.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, virt_dev->out_ctx_dma, LAST_CTX_TO_EP_NUM(virt_dev->in_ctx->slot.dev_info)); xhci_zero_in_ctx(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(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; 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); 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); if (!ret) { 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); u32 temp; 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 */ 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); ret = -EINVAL; break; } if (ret) { return ret; } temp = xhci_readl(xhci, &xhci->op_regs->dcbaa_ptr[0]); xhci_dbg(xhci, "Op regs DCBAA ptr[0] = %#08x\n", temp); temp = xhci_readl(xhci, &xhci->op_regs->dcbaa_ptr[1]); xhci_dbg(xhci, "Op regs DCBAA ptr[1] = %#08x\n", temp); xhci_dbg(xhci, "Slot ID %d dcbaa entry[0] @%p = %#08x\n", udev->slot_id, &xhci->dcbaa->dev_context_ptrs[2*udev->slot_id], xhci->dcbaa->dev_context_ptrs[2*udev->slot_id]); xhci_dbg(xhci, "Slot ID %d dcbaa entry[1] @%p = %#08x\n", udev->slot_id, &xhci->dcbaa->dev_context_ptrs[2*udev->slot_id+1], xhci->dcbaa->dev_context_ptrs[2*udev->slot_id+1]); 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, virt_dev->in_ctx_dma, 2); xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id); xhci_dbg_ctx(xhci, virt_dev->out_ctx, virt_dev->out_ctx_dma, 2); /* * USB core uses address 1 for the roothubs, so we add one to the * address given back to us by the HC. */ udev->devnum = (virt_dev->out_ctx->slot.dev_state & DEV_ADDR_MASK) + 1; /* Zero the input context control for later use */ virt_dev->in_ctx->add_flags = 0; virt_dev->in_ctx->drop_flags = 0; /* Mirror flags in the output context for future ep enable/disable */ virt_dev->out_ctx->add_flags = SLOT_FLAG | EP0_FLAG; virt_dev->out_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); /* EHCI mods by the periodic size. Why? */ return xhci_readl(xhci, &xhci->run_regs->microframe_index) >> 3; } MODULE_DESCRIPTION(DRIVER_DESC); MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_LICENSE("GPL"); static int __init xhci_hcd_init(void) { #ifdef CONFIG_PCI int retval = 0; retval = xhci_register_pci(); if (retval < 0) { printk(KERN_DEBUG "Problem registering PCI driver."); 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_device_control) != (8+8+8*31)*32/8); 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); static void __exit xhci_hcd_cleanup(void) { #ifdef CONFIG_PCI xhci_unregister_pci(); #endif } module_exit(xhci_hcd_cleanup);