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![Sarah Sharp](/assets/img/avatar_default.png)
Drop spinlock in xhci_irq() error path. This fixes the issue reported by Oliver Neukum on this thread: http://marc.info/?l=linux-usb&m=124090924401444&w=2 Remove unnecessary register read reported by Viral Mehta: http://marc.info/?l=linux-usb&m=124091326007398&w=2 Reported-by: Oliver Neukum <oliver@neukum.org> Reported-by: Viral Mehta <viral.mehta@einfochips.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1255 lines
39 KiB
C
1255 lines
39 KiB
C
/*
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* xHCI host controller driver
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*
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* Copyright (C) 2008 Intel Corp.
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*
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* Author: Sarah Sharp
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* Some code borrowed from the Linux EHCI driver.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/irq.h>
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#include <linux/module.h>
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#include "xhci.h"
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#define DRIVER_AUTHOR "Sarah Sharp"
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#define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
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/* TODO: copied from ehci-hcd.c - can this be refactored? */
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/*
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* handshake - spin reading hc until handshake completes or fails
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* @ptr: address of hc register to be read
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* @mask: bits to look at in result of read
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* @done: value of those bits when handshake succeeds
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* @usec: timeout in microseconds
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*
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* Returns negative errno, or zero on success
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*
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* Success happens when the "mask" bits have the specified value (hardware
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* handshake done). There are two failure modes: "usec" have passed (major
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* hardware flakeout), or the register reads as all-ones (hardware removed).
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*/
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static int handshake(struct xhci_hcd *xhci, void __iomem *ptr,
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u32 mask, u32 done, int usec)
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{
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u32 result;
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do {
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result = xhci_readl(xhci, ptr);
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if (result == ~(u32)0) /* card removed */
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return -ENODEV;
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result &= mask;
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if (result == done)
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return 0;
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udelay(1);
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usec--;
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} while (usec > 0);
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return -ETIMEDOUT;
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}
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/*
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* Force HC into halt state.
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*
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* Disable any IRQs and clear the run/stop bit.
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* HC will complete any current and actively pipelined transactions, and
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* should halt within 16 microframes of the run/stop bit being cleared.
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* Read HC Halted bit in the status register to see when the HC is finished.
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* XXX: shouldn't we set HC_STATE_HALT here somewhere?
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*/
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int xhci_halt(struct xhci_hcd *xhci)
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{
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u32 halted;
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u32 cmd;
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u32 mask;
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xhci_dbg(xhci, "// Halt the HC\n");
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/* Disable all interrupts from the host controller */
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mask = ~(XHCI_IRQS);
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halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT;
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if (!halted)
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mask &= ~CMD_RUN;
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cmd = xhci_readl(xhci, &xhci->op_regs->command);
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cmd &= mask;
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xhci_writel(xhci, cmd, &xhci->op_regs->command);
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return handshake(xhci, &xhci->op_regs->status,
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STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC);
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}
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/*
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* Reset a halted HC, and set the internal HC state to HC_STATE_HALT.
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*
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* This resets pipelines, timers, counters, state machines, etc.
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* Transactions will be terminated immediately, and operational registers
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* will be set to their defaults.
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*/
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int xhci_reset(struct xhci_hcd *xhci)
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{
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u32 command;
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u32 state;
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state = xhci_readl(xhci, &xhci->op_regs->status);
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BUG_ON((state & STS_HALT) == 0);
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xhci_dbg(xhci, "// Reset the HC\n");
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command = xhci_readl(xhci, &xhci->op_regs->command);
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command |= CMD_RESET;
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xhci_writel(xhci, command, &xhci->op_regs->command);
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/* XXX: Why does EHCI set this here? Shouldn't other code do this? */
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xhci_to_hcd(xhci)->state = HC_STATE_HALT;
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return handshake(xhci, &xhci->op_regs->command, CMD_RESET, 0, 250 * 1000);
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}
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/*
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* Stop the HC from processing the endpoint queues.
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*/
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static void xhci_quiesce(struct xhci_hcd *xhci)
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{
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/*
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* Queues are per endpoint, so we need to disable an endpoint or slot.
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*
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* To disable a slot, we need to insert a disable slot command on the
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* command ring and ring the doorbell. This will also free any internal
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* resources associated with the slot (which might not be what we want).
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*
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* A Release Endpoint command sounds better - doesn't free internal HC
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* memory, but removes the endpoints from the schedule and releases the
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* bandwidth, disables the doorbells, and clears the endpoint enable
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* flag. Usually used prior to a set interface command.
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*
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* TODO: Implement after command ring code is done.
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*/
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BUG_ON(!HC_IS_RUNNING(xhci_to_hcd(xhci)->state));
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xhci_dbg(xhci, "Finished quiescing -- code not written yet\n");
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}
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#if 0
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/* Set up MSI-X table for entry 0 (may claim other entries later) */
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static int xhci_setup_msix(struct xhci_hcd *xhci)
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{
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int ret;
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struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
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xhci->msix_count = 0;
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/* XXX: did I do this right? ixgbe does kcalloc for more than one */
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xhci->msix_entries = kmalloc(sizeof(struct msix_entry), GFP_KERNEL);
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if (!xhci->msix_entries) {
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xhci_err(xhci, "Failed to allocate MSI-X entries\n");
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return -ENOMEM;
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}
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xhci->msix_entries[0].entry = 0;
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ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count);
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if (ret) {
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xhci_err(xhci, "Failed to enable MSI-X\n");
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goto free_entries;
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}
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/*
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* Pass the xhci pointer value as the request_irq "cookie".
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* If more irqs are added, this will need to be unique for each one.
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*/
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ret = request_irq(xhci->msix_entries[0].vector, &xhci_irq, 0,
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"xHCI", xhci_to_hcd(xhci));
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if (ret) {
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xhci_err(xhci, "Failed to allocate MSI-X interrupt\n");
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goto disable_msix;
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}
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xhci_dbg(xhci, "Finished setting up MSI-X\n");
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return 0;
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disable_msix:
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pci_disable_msix(pdev);
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free_entries:
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kfree(xhci->msix_entries);
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xhci->msix_entries = NULL;
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return ret;
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}
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/* XXX: code duplication; can xhci_setup_msix call this? */
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/* Free any IRQs and disable MSI-X */
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static void xhci_cleanup_msix(struct xhci_hcd *xhci)
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{
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struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
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if (!xhci->msix_entries)
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return;
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free_irq(xhci->msix_entries[0].vector, xhci);
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pci_disable_msix(pdev);
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kfree(xhci->msix_entries);
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xhci->msix_entries = NULL;
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xhci_dbg(xhci, "Finished cleaning up MSI-X\n");
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}
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#endif
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/*
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* Initialize memory for HCD and xHC (one-time init).
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*
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* Program the PAGESIZE register, initialize the device context array, create
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* device contexts (?), set up a command ring segment (or two?), create event
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* ring (one for now).
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*/
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int xhci_init(struct usb_hcd *hcd)
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{
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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int retval = 0;
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xhci_dbg(xhci, "xhci_init\n");
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spin_lock_init(&xhci->lock);
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retval = xhci_mem_init(xhci, GFP_KERNEL);
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xhci_dbg(xhci, "Finished xhci_init\n");
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return retval;
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}
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/*
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* Called in interrupt context when there might be work
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* queued on the event ring
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*
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* xhci->lock must be held by caller.
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*/
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static void xhci_work(struct xhci_hcd *xhci)
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{
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u32 temp;
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/*
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* Clear the op reg interrupt status first,
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* so we can receive interrupts from other MSI-X interrupters.
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* Write 1 to clear the interrupt status.
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*/
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temp = xhci_readl(xhci, &xhci->op_regs->status);
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temp |= STS_EINT;
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xhci_writel(xhci, temp, &xhci->op_regs->status);
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/* FIXME when MSI-X is supported and there are multiple vectors */
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/* Clear the MSI-X event interrupt status */
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/* Acknowledge the interrupt */
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temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
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temp |= 0x3;
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xhci_writel(xhci, temp, &xhci->ir_set->irq_pending);
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/* Flush posted writes */
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xhci_readl(xhci, &xhci->ir_set->irq_pending);
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/* FIXME this should be a delayed service routine that clears the EHB */
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xhci_handle_event(xhci);
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/* Clear the event handler busy flag; the event ring should be empty. */
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temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
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xhci_writel(xhci, temp & ~ERST_EHB, &xhci->ir_set->erst_dequeue[0]);
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/* Flush posted writes -- FIXME is this necessary? */
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xhci_readl(xhci, &xhci->ir_set->irq_pending);
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}
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/*-------------------------------------------------------------------------*/
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/*
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* xHCI spec says we can get an interrupt, and if the HC has an error condition,
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* we might get bad data out of the event ring. Section 4.10.2.7 has a list of
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* indicators of an event TRB error, but we check the status *first* to be safe.
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*/
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irqreturn_t xhci_irq(struct usb_hcd *hcd)
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{
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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u32 temp, temp2;
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spin_lock(&xhci->lock);
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/* Check if the xHC generated the interrupt, or the irq is shared */
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temp = xhci_readl(xhci, &xhci->op_regs->status);
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temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
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if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
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spin_unlock(&xhci->lock);
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return IRQ_NONE;
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}
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if (temp & STS_FATAL) {
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xhci_warn(xhci, "WARNING: Host System Error\n");
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xhci_halt(xhci);
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xhci_to_hcd(xhci)->state = HC_STATE_HALT;
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spin_unlock(&xhci->lock);
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return -ESHUTDOWN;
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}
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xhci_work(xhci);
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spin_unlock(&xhci->lock);
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
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void xhci_event_ring_work(unsigned long arg)
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{
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unsigned long flags;
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int temp;
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struct xhci_hcd *xhci = (struct xhci_hcd *) arg;
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int i, j;
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xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies);
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spin_lock_irqsave(&xhci->lock, flags);
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temp = xhci_readl(xhci, &xhci->op_regs->status);
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xhci_dbg(xhci, "op reg status = 0x%x\n", temp);
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temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
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xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp);
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xhci_dbg(xhci, "No-op commands handled = %d\n", xhci->noops_handled);
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xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask);
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xhci->error_bitmask = 0;
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xhci_dbg(xhci, "Event ring:\n");
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xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
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xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
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temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
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temp &= ERST_PTR_MASK;
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xhci_dbg(xhci, "ERST deq = 0x%x\n", temp);
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xhci_dbg(xhci, "Command ring:\n");
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xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg);
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xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
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xhci_dbg_cmd_ptrs(xhci);
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for (i = 0; i < MAX_HC_SLOTS; ++i) {
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if (xhci->devs[i]) {
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for (j = 0; j < 31; ++j) {
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if (xhci->devs[i]->ep_rings[j]) {
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xhci_dbg(xhci, "Dev %d endpoint ring %d:\n", i, j);
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xhci_debug_segment(xhci, xhci->devs[i]->ep_rings[j]->deq_seg);
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}
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}
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}
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}
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if (xhci->noops_submitted != NUM_TEST_NOOPS)
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if (xhci_setup_one_noop(xhci))
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xhci_ring_cmd_db(xhci);
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spin_unlock_irqrestore(&xhci->lock, flags);
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if (!xhci->zombie)
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mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ);
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else
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xhci_dbg(xhci, "Quit polling the event ring.\n");
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}
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#endif
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/*
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* Start the HC after it was halted.
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*
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* This function is called by the USB core when the HC driver is added.
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* Its opposite is xhci_stop().
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*
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* xhci_init() must be called once before this function can be called.
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* Reset the HC, enable device slot contexts, program DCBAAP, and
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* set command ring pointer and event ring pointer.
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*
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* Setup MSI-X vectors and enable interrupts.
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*/
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int xhci_run(struct usb_hcd *hcd)
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{
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u32 temp;
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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void (*doorbell)(struct xhci_hcd *) = NULL;
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hcd->uses_new_polling = 1;
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hcd->poll_rh = 0;
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xhci_dbg(xhci, "xhci_run\n");
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#if 0 /* FIXME: MSI not setup yet */
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/* Do this at the very last minute */
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ret = xhci_setup_msix(xhci);
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if (!ret)
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return ret;
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return -ENOSYS;
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#endif
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#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
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init_timer(&xhci->event_ring_timer);
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xhci->event_ring_timer.data = (unsigned long) xhci;
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xhci->event_ring_timer.function = xhci_event_ring_work;
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/* Poll the event ring */
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xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ;
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xhci->zombie = 0;
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xhci_dbg(xhci, "Setting event ring polling timer\n");
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add_timer(&xhci->event_ring_timer);
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#endif
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xhci_dbg(xhci, "// Set the interrupt modulation register\n");
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temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
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temp &= 0xffff;
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temp |= (u32) 160;
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xhci_writel(xhci, temp, &xhci->ir_set->irq_control);
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/* Set the HCD state before we enable the irqs */
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hcd->state = HC_STATE_RUNNING;
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temp = xhci_readl(xhci, &xhci->op_regs->command);
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temp |= (CMD_EIE);
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xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n",
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temp);
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xhci_writel(xhci, temp, &xhci->op_regs->command);
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temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
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xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n",
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xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
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xhci_writel(xhci, ER_IRQ_ENABLE(temp),
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&xhci->ir_set->irq_pending);
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xhci_print_ir_set(xhci, xhci->ir_set, 0);
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if (NUM_TEST_NOOPS > 0)
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doorbell = xhci_setup_one_noop(xhci);
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xhci_dbg(xhci, "Command ring memory map follows:\n");
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xhci_debug_ring(xhci, xhci->cmd_ring);
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xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
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xhci_dbg_cmd_ptrs(xhci);
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xhci_dbg(xhci, "ERST memory map follows:\n");
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xhci_dbg_erst(xhci, &xhci->erst);
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xhci_dbg(xhci, "Event ring:\n");
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xhci_debug_ring(xhci, xhci->event_ring);
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xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
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temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
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temp &= ERST_PTR_MASK;
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xhci_dbg(xhci, "ERST deq = 0x%x\n", temp);
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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");
|
|
return -EINVAL;
|
|
}
|
|
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.
|
|
*/
|
|
int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
|
|
struct usb_host_endpoint *ep)
|
|
{
|
|
unsigned long flags;
|
|
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;
|
|
}
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (!xhci->devs || !xhci->devs[udev->slot_id]) {
|
|
xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
|
|
__func__);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
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);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
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);
|
|
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
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.
|
|
*/
|
|
int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
|
|
struct usb_host_endpoint *ep)
|
|
{
|
|
unsigned long flags;
|
|
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;
|
|
}
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (!xhci->devs || !xhci->devs[udev->slot_id]) {
|
|
xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
|
|
__func__);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
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);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
if (xhci_endpoint_init(xhci, xhci->devs[udev->slot_id], udev, ep) < 0) {
|
|
dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
|
|
__func__, ep->desc.bEndpointAddress);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
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;
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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);
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (!udev->slot_id || !xhci->devs || !xhci->devs[udev->slot_id]) {
|
|
xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
|
|
__func__);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
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));
|
|
|
|
ret = xhci_queue_configure_endpoint(xhci, virt_dev->in_ctx_dma,
|
|
udev->slot_id);
|
|
if (ret < 0) {
|
|
xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
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;
|
|
}
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
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() */
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
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;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
|
|
{
|
|
unsigned long flags;
|
|
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);
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (!xhci->devs || !xhci->devs[udev->slot_id]) {
|
|
xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
|
|
__func__);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
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);
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
if (!xhci->slot_id) {
|
|
xhci_err(xhci, "Error while assigning device slot ID\n");
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
return 0;
|
|
}
|
|
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");
|
|
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? */
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
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;
|
|
}
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
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 */
|
|
|
|
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;
|
|
}
|
|
|
|
spin_lock_irqsave(&xhci->lock, flags);
|
|
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) {
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
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;
|
|
spin_unlock_irqrestore(&xhci->lock, flags);
|
|
|
|
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
|
|
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);
|