diff options
Diffstat (limited to 'drivers/usb/host/xhci-hcd.c')
| -rw-r--r-- | drivers/usb/host/xhci-hcd.c | 1274 |
1 files changed, 1274 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-hcd.c b/drivers/usb/host/xhci-hcd.c new file mode 100644 index 0000000..dba3e07 --- /dev/null +++ b/drivers/usb/host/xhci-hcd.c @@ -0,0 +1,1274 @@ +/* + * 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 <linux/irq.h> +#include <linux/module.h> + +#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) + 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; + + 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); +} + +/* + * 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); |