diff options
Diffstat (limited to 'drivers/usb/host/xhci.c')
| -rw-r--r-- | drivers/usb/host/xhci.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 3d2af688157..33d0034d8a6 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -551,6 +551,216 @@ void xhci_shutdown(struct usb_hcd *hcd) xhci_readl(xhci, &xhci->op_regs->status)); } +static void xhci_save_registers(struct xhci_hcd *xhci) +{ + xhci->s3.command = xhci_readl(xhci, &xhci->op_regs->command); + xhci->s3.dev_nt = xhci_readl(xhci, &xhci->op_regs->dev_notification); + xhci->s3.dcbaa_ptr = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr); + xhci->s3.config_reg = xhci_readl(xhci, &xhci->op_regs->config_reg); + xhci->s3.irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending); + xhci->s3.irq_control = xhci_readl(xhci, &xhci->ir_set->irq_control); + xhci->s3.erst_size = xhci_readl(xhci, &xhci->ir_set->erst_size); + xhci->s3.erst_base = xhci_read_64(xhci, &xhci->ir_set->erst_base); + xhci->s3.erst_dequeue = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); +} + +static void xhci_restore_registers(struct xhci_hcd *xhci) +{ + xhci_writel(xhci, xhci->s3.command, &xhci->op_regs->command); + xhci_writel(xhci, xhci->s3.dev_nt, &xhci->op_regs->dev_notification); + xhci_write_64(xhci, xhci->s3.dcbaa_ptr, &xhci->op_regs->dcbaa_ptr); + xhci_writel(xhci, xhci->s3.config_reg, &xhci->op_regs->config_reg); + xhci_writel(xhci, xhci->s3.irq_pending, &xhci->ir_set->irq_pending); + xhci_writel(xhci, xhci->s3.irq_control, &xhci->ir_set->irq_control); + xhci_writel(xhci, xhci->s3.erst_size, &xhci->ir_set->erst_size); + xhci_write_64(xhci, xhci->s3.erst_base, &xhci->ir_set->erst_base); +} + +/* + * Stop HC (not bus-specific) + * + * This is called when the machine transition into S3/S4 mode. + * + */ +int xhci_suspend(struct xhci_hcd *xhci) +{ + int rc = 0; + struct usb_hcd *hcd = xhci_to_hcd(xhci); + u32 command; + + spin_lock_irq(&xhci->lock); + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + /* step 1: stop endpoint */ + /* skipped assuming that port suspend has done */ + + /* step 2: clear Run/Stop bit */ + command = xhci_readl(xhci, &xhci->op_regs->command); + command &= ~CMD_RUN; + xhci_writel(xhci, command, &xhci->op_regs->command); + if (handshake(xhci, &xhci->op_regs->status, + STS_HALT, STS_HALT, 100*100)) { + xhci_warn(xhci, "WARN: xHC CMD_RUN timeout\n"); + spin_unlock_irq(&xhci->lock); + return -ETIMEDOUT; + } + + /* step 3: save registers */ + xhci_save_registers(xhci); + + /* step 4: set CSS flag */ + command = xhci_readl(xhci, &xhci->op_regs->command); + command |= CMD_CSS; + xhci_writel(xhci, command, &xhci->op_regs->command); + if (handshake(xhci, &xhci->op_regs->status, STS_SAVE, 0, 10*100)) { + xhci_warn(xhci, "WARN: xHC CMD_CSS timeout\n"); + spin_unlock_irq(&xhci->lock); + return -ETIMEDOUT; + } + /* step 5: remove core well power */ + xhci_cleanup_msix(xhci); + spin_unlock_irq(&xhci->lock); + + return rc; +} + +/* + * start xHC (not bus-specific) + * + * This is called when the machine transition from S3/S4 mode. + * + */ +int xhci_resume(struct xhci_hcd *xhci, bool hibernated) +{ + u32 command, temp = 0; + struct usb_hcd *hcd = xhci_to_hcd(xhci); + struct pci_dev *pdev = to_pci_dev(hcd->self.controller); + u64 val_64; + int old_state, retval; + + old_state = hcd->state; + if (time_before(jiffies, xhci->next_statechange)) + msleep(100); + + spin_lock_irq(&xhci->lock); + + if (!hibernated) { + /* step 1: restore register */ + xhci_restore_registers(xhci); + /* step 2: initialize command ring buffer */ + val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); + val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) | + (xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg, + xhci->cmd_ring->dequeue) & + (u64) ~CMD_RING_RSVD_BITS) | + xhci->cmd_ring->cycle_state; + xhci_dbg(xhci, "// Setting command ring address to 0x%llx\n", + (long unsigned long) val_64); + xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring); + /* step 3: restore state and start state*/ + /* step 3: set CRS flag */ + command = xhci_readl(xhci, &xhci->op_regs->command); + command |= CMD_CRS; + xhci_writel(xhci, command, &xhci->op_regs->command); + if (handshake(xhci, &xhci->op_regs->status, + STS_RESTORE, 0, 10*100)) { + xhci_dbg(xhci, "WARN: xHC CMD_CSS timeout\n"); + spin_unlock_irq(&xhci->lock); + return -ETIMEDOUT; + } + temp = xhci_readl(xhci, &xhci->op_regs->status); + } + + /* If restore operation fails, re-initialize the HC during resume */ + if ((temp & STS_SRE) || hibernated) { + usb_root_hub_lost_power(hcd->self.root_hub); + + xhci_dbg(xhci, "Stop HCD\n"); + xhci_halt(xhci); + xhci_reset(xhci); + if (hibernated) + xhci_cleanup_msix(xhci); + spin_unlock_irq(&xhci->lock); + +#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)); + + xhci_dbg(xhci, "Initialize the HCD\n"); + retval = xhci_init(hcd); + if (retval) + return retval; + + xhci_dbg(xhci, "Start the HCD\n"); + retval = xhci_run(hcd); + if (!retval) + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + hcd->state = HC_STATE_SUSPENDED; + return retval; + } + + /* Re-setup MSI-X */ + if (hcd->irq) + free_irq(hcd->irq, hcd); + hcd->irq = -1; + + retval = xhci_setup_msix(xhci); + if (retval) + /* fall back to msi*/ + retval = xhci_setup_msi(xhci); + + if (retval) { + /* fall back to legacy interrupt*/ + retval = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED, + hcd->irq_descr, hcd); + if (retval) { + xhci_err(xhci, "request interrupt %d failed\n", + pdev->irq); + return retval; + } + hcd->irq = pdev->irq; + } + + /* step 4: set Run/Stop bit */ + command = xhci_readl(xhci, &xhci->op_regs->command); + command |= CMD_RUN; + xhci_writel(xhci, command, &xhci->op_regs->command); + handshake(xhci, &xhci->op_regs->status, STS_HALT, + 0, 250 * 1000); + + /* step 5: walk topology and initialize portsc, + * portpmsc and portli + */ + /* this is done in bus_resume */ + + /* step 6: restart each of the previously + * Running endpoints by ringing their doorbells + */ + + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + if (!hibernated) + hcd->state = old_state; + else + hcd->state = HC_STATE_SUSPENDED; + + spin_unlock_irq(&xhci->lock); + return 0; +} + /*-------------------------------------------------------------------------*/ /** |