/* * xHCI host controller driver * * Copyright (C) 2008 Intel Corp. * * Author: Sarah Sharp * Some code borrowed from the Linux EHCI driver. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include "xhci.h" #define PORT_WAKE_BITS (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E) #define PORT_RWC_BITS (PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \ PORT_RC | PORT_PLC | PORT_PE) static void xhci_common_hub_descriptor(struct xhci_hcd *xhci, struct usb_hub_descriptor *desc, int ports) { u16 temp; desc->bPwrOn2PwrGood = 10; /* xhci section 5.4.9 says 20ms max */ desc->bHubContrCurrent = 0; desc->bNbrPorts = ports; /* Ugh, these should be #defines, FIXME */ /* Using table 11-13 in USB 2.0 spec. */ temp = 0; /* Bits 1:0 - support port power switching, or power always on */ if (HCC_PPC(xhci->hcc_params)) temp |= 0x0001; else temp |= 0x0002; /* Bit 2 - root hubs are not part of a compound device */ /* Bits 4:3 - individual port over current protection */ temp |= 0x0008; /* Bits 6:5 - no TTs in root ports */ /* Bit 7 - no port indicators */ desc->wHubCharacteristics = (__force __u16) cpu_to_le16(temp); } /* Fill in the USB 2.0 roothub descriptor */ static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci, struct usb_hub_descriptor *desc) { int ports; u16 temp; __u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8]; u32 portsc; unsigned int i; ports = xhci->num_usb2_ports; xhci_common_hub_descriptor(xhci, desc, ports); desc->bDescriptorType = 0x29; temp = 1 + (ports / 8); desc->bDescLength = 7 + 2 * temp; /* The Device Removable bits are reported on a byte granularity. * If the port doesn't exist within that byte, the bit is set to 0. */ memset(port_removable, 0, sizeof(port_removable)); for (i = 0; i < ports; i++) { portsc = xhci_readl(xhci, xhci->usb3_ports[i]); /* If a device is removable, PORTSC reports a 0, same as in the * hub descriptor DeviceRemovable bits. */ if (portsc & PORT_DEV_REMOVE) /* This math is hairy because bit 0 of DeviceRemovable * is reserved, and bit 1 is for port 1, etc. */ port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8); } /* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN * ports on it. The USB 2.0 specification says that there are two * variable length fields at the end of the hub descriptor: * DeviceRemovable and PortPwrCtrlMask. But since we can have less than * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array * to set PortPwrCtrlMask bits. PortPwrCtrlMask must always be set to * 0xFF, so we initialize the both arrays (DeviceRemovable and * PortPwrCtrlMask) to 0xFF. Then we set the DeviceRemovable for each * set of ports that actually exist. */ memset(desc->u.hs.DeviceRemovable, 0xff, sizeof(desc->u.hs.DeviceRemovable)); memset(desc->u.hs.PortPwrCtrlMask, 0xff, sizeof(desc->u.hs.PortPwrCtrlMask)); for (i = 0; i < (ports + 1 + 7) / 8; i++) memset(&desc->u.hs.DeviceRemovable[i], port_removable[i], sizeof(__u8)); } /* Fill in the USB 3.0 roothub descriptor */ static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci, struct usb_hub_descriptor *desc) { int ports; u16 port_removable; u32 portsc; unsigned int i; ports = xhci->num_usb3_ports; xhci_common_hub_descriptor(xhci, desc, ports); desc->bDescriptorType = 0x2a; desc->bDescLength = 12; /* header decode latency should be zero for roothubs, * see section 4.23.5.2. */ desc->u.ss.bHubHdrDecLat = 0; desc->u.ss.wHubDelay = 0; port_removable = 0; /* bit 0 is reserved, bit 1 is for port 1, etc. */ for (i = 0; i < ports; i++) { portsc = xhci_readl(xhci, xhci->usb3_ports[i]); if (portsc & PORT_DEV_REMOVE) port_removable |= 1 << (i + 1); } memset(&desc->u.ss.DeviceRemovable, (__force __u16) cpu_to_le16(port_removable), sizeof(__u16)); } static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci, struct usb_hub_descriptor *desc) { if (hcd->speed == HCD_USB3) xhci_usb3_hub_descriptor(hcd, xhci, desc); else xhci_usb2_hub_descriptor(hcd, xhci, desc); } static unsigned int xhci_port_speed(unsigned int port_status) { if (DEV_LOWSPEED(port_status)) return USB_PORT_STAT_LOW_SPEED; if (DEV_HIGHSPEED(port_status)) return USB_PORT_STAT_HIGH_SPEED; /* * FIXME: Yes, we should check for full speed, but the core uses that as * a default in portspeed() in usb/core/hub.c (which is the only place * USB_PORT_STAT_*_SPEED is used). */ return 0; } /* * These bits are Read Only (RO) and should be saved and written to the * registers: 0, 3, 10:13, 30 * connect status, over-current status, port speed, and device removable. * connect status and port speed are also sticky - meaning they're in * the AUX well and they aren't changed by a hot, warm, or cold reset. */ #define XHCI_PORT_RO ((1<<0) | (1<<3) | (0xf<<10) | (1<<30)) /* * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit: * bits 5:8, 9, 14:15, 25:27 * link state, port power, port indicator state, "wake on" enable state */ #define XHCI_PORT_RWS ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25)) /* * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect: * bit 4 (port reset) */ #define XHCI_PORT_RW1S ((1<<4)) /* * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect: * bits 1, 17, 18, 19, 20, 21, 22, 23 * port enable/disable, and * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports), * over-current, reset, link state, and L1 change */ #define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17)) /* * Bit 16 is RW, and writing a '1' to it causes the link state control to be * latched in */ #define XHCI_PORT_RW ((1<<16)) /* * These bits are Reserved Zero (RsvdZ) and zero should be written to them: * bits 2, 24, 28:31 */ #define XHCI_PORT_RZ ((1<<2) | (1<<24) | (0xf<<28)) /* * Given a port state, this function returns a value that would result in the * port being in the same state, if the value was written to the port status * control register. * Save Read Only (RO) bits and save read/write bits where * writing a 0 clears the bit and writing a 1 sets the bit (RWS). * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect. */ u32 xhci_port_state_to_neutral(u32 state) { /* Save read-only status and port state */ return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS); } /* * find slot id based on port number. * @port: The one-based port number from one of the two split roothubs. */ int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci, u16 port) { int slot_id; int i; enum usb_device_speed speed; slot_id = 0; for (i = 0; i < MAX_HC_SLOTS; i++) { if (!xhci->devs[i]) continue; speed = xhci->devs[i]->udev->speed; if (((speed == USB_SPEED_SUPER) == (hcd->speed == HCD_USB3)) && xhci->devs[i]->port == port) { slot_id = i; break; } } return slot_id; } /* * Stop device * It issues stop endpoint command for EP 0 to 30. And wait the last command * to complete. * suspend will set to 1, if suspend bit need to set in command. */ static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend) { struct xhci_virt_device *virt_dev; struct xhci_command *cmd; unsigned long flags; int timeleft; int ret; int i; ret = 0; virt_dev = xhci->devs[slot_id]; cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO); if (!cmd) { xhci_dbg(xhci, "Couldn't allocate command structure.\n"); return -ENOMEM; } spin_lock_irqsave(&xhci->lock, flags); for (i = LAST_EP_INDEX; i > 0; i--) { if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) xhci_queue_stop_endpoint(xhci, slot_id, i, suspend); } cmd->command_trb = xhci->cmd_ring->enqueue; list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list); xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend); xhci_ring_cmd_db(xhci); spin_unlock_irqrestore(&xhci->lock, flags); /* Wait for last stop endpoint command to finish */ timeleft = wait_for_completion_interruptible_timeout( cmd->completion, USB_CTRL_SET_TIMEOUT); if (timeleft <= 0) { xhci_warn(xhci, "%s while waiting for stop endpoint command\n", timeleft == 0 ? "Timeout" : "Signal"); spin_lock_irqsave(&xhci->lock, flags); /* The timeout might have raced with the event ring handler, so * only delete from the list if the item isn't poisoned. */ if (cmd->cmd_list.next != LIST_POISON1) list_del(&cmd->cmd_list); spin_unlock_irqrestore(&xhci->lock, flags); ret = -ETIME; goto command_cleanup; } command_cleanup: xhci_free_command(xhci, cmd); return ret; } /* * Ring device, it rings the all doorbells unconditionally. */ void xhci_ring_device(struct xhci_hcd *xhci, int slot_id) { int i; for (i = 0; i < LAST_EP_INDEX + 1; i++) if (xhci->devs[slot_id]->eps[i].ring && xhci->devs[slot_id]->eps[i].ring->dequeue) xhci_ring_ep_doorbell(xhci, slot_id, i, 0); return; } static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci, u16 wIndex, u32 __iomem *addr, u32 port_status) { /* Don't allow the USB core to disable SuperSpeed ports. */ if (hcd->speed == HCD_USB3) { xhci_dbg(xhci, "Ignoring request to disable " "SuperSpeed port.\n"); return; } /* Write 1 to disable the port */ xhci_writel(xhci, port_status | PORT_PE, addr); port_status = xhci_readl(xhci, addr); xhci_dbg(xhci, "disable port, actual port %d status = 0x%x\n", wIndex, port_status); } static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue, u16 wIndex, u32 __iomem *addr, u32 port_status) { char *port_change_bit; u32 status; switch (wValue) { case USB_PORT_FEAT_C_RESET: status = PORT_RC; port_change_bit = "reset"; break; case USB_PORT_FEAT_C_CONNECTION: status = PORT_CSC; port_change_bit = "connect"; break; case USB_PORT_FEAT_C_OVER_CURRENT: status = PORT_OCC; port_change_bit = "over-current"; break; case USB_PORT_FEAT_C_ENABLE: status = PORT_PEC; port_change_bit = "enable/disable"; break; case USB_PORT_FEAT_C_SUSPEND: status = PORT_PLC; port_change_bit = "suspend/resume"; break; default: /* Should never happen */ return; } /* Change bits are all write 1 to clear */ xhci_writel(xhci, port_status | status, addr); port_status = xhci_readl(xhci, addr); xhci_dbg(xhci, "clear port %s change, actual port %d status = 0x%x\n", port_change_bit, wIndex, port_status); } int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex, char *buf, u16 wLength) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); int ports; unsigned long flags; u32 temp, temp1, status; int retval = 0; u32 __iomem **port_array; int slot_id; struct xhci_bus_state *bus_state; if (hcd->speed == HCD_USB3) { ports = xhci->num_usb3_ports; port_array = xhci->usb3_ports; } else { ports = xhci->num_usb2_ports; port_array = xhci->usb2_ports; } bus_state = &xhci->bus_state[hcd_index(hcd)]; spin_lock_irqsave(&xhci->lock, flags); switch (typeReq) { case GetHubStatus: /* No power source, over-current reported per port */ memset(buf, 0, 4); break; case GetHubDescriptor: /* Check to make sure userspace is asking for the USB 3.0 hub * descriptor for the USB 3.0 roothub. If not, we stall the * endpoint, like external hubs do. */ if (hcd->speed == HCD_USB3 && (wLength < USB_DT_SS_HUB_SIZE || wValue != (USB_DT_SS_HUB << 8))) { xhci_dbg(xhci, "Wrong hub descriptor type for " "USB 3.0 roothub.\n"); goto error; } xhci_hub_descriptor(hcd, xhci, (struct usb_hub_descriptor *) buf); break; case GetPortStatus: if (!wIndex || wIndex > ports) goto error; wIndex--; status = 0; temp = xhci_readl(xhci, port_array[wIndex]); if (temp == 0xffffffff) { retval = -ENODEV; break; } xhci_dbg(xhci, "get port status, actual port %d status = 0x%x\n", wIndex, temp); /* FIXME - should we return a port status value like the USB * 3.0 external hubs do? */ /* wPortChange bits */ if (temp & PORT_CSC) status |= USB_PORT_STAT_C_CONNECTION << 16; if (temp & PORT_PEC) status |= USB_PORT_STAT_C_ENABLE << 16; if ((temp & PORT_OCC)) status |= USB_PORT_STAT_C_OVERCURRENT << 16; /* * FIXME ignoring reset and USB 2.1/3.0 specific * changes */ if ((temp & PORT_PLS_MASK) == XDEV_U3 && (temp & PORT_POWER)) status |= 1 << USB_PORT_FEAT_SUSPEND; if ((temp & PORT_PLS_MASK) == XDEV_RESUME) { if ((temp & PORT_RESET) || !(temp & PORT_PE)) goto error; if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies, bus_state->resume_done[wIndex])) { xhci_dbg(xhci, "Resume USB2 port %d\n", wIndex + 1); bus_state->resume_done[wIndex] = 0; temp1 = xhci_port_state_to_neutral(temp); temp1 &= ~PORT_PLS_MASK; temp1 |= PORT_LINK_STROBE | XDEV_U0; xhci_writel(xhci, temp1, port_array[wIndex]); xhci_dbg(xhci, "set port %d resume\n", wIndex + 1); slot_id = xhci_find_slot_id_by_port(hcd, xhci, wIndex + 1); if (!slot_id) { xhci_dbg(xhci, "slot_id is zero\n"); goto error; } xhci_ring_device(xhci, slot_id); bus_state->port_c_suspend |= 1 << wIndex; bus_state->suspended_ports &= ~(1 << wIndex); } } if ((temp & PORT_PLS_MASK) == XDEV_U0 && (temp & PORT_POWER) && (bus_state->suspended_ports & (1 << wIndex))) { bus_state->suspended_ports &= ~(1 << wIndex); bus_state->port_c_suspend |= 1 << wIndex; } if (temp & PORT_CONNECT) { status |= USB_PORT_STAT_CONNECTION; status |= xhci_port_speed(temp); } if (temp & PORT_PE) status |= USB_PORT_STAT_ENABLE; if (temp & PORT_OC) status |= USB_PORT_STAT_OVERCURRENT; if (temp & PORT_RESET) status |= USB_PORT_STAT_RESET; if (temp & PORT_POWER) status |= USB_PORT_STAT_POWER; if (bus_state->port_c_suspend & (1 << wIndex)) status |= 1 << USB_PORT_FEAT_C_SUSPEND; xhci_dbg(xhci, "Get port status returned 0x%x\n", status); put_unaligned(cpu_to_le32(status), (__le32 *) buf); break; case SetPortFeature: wIndex &= 0xff; if (!wIndex || wIndex > ports) goto error; wIndex--; temp = xhci_readl(xhci, port_array[wIndex]); if (temp == 0xffffffff) { retval = -ENODEV; break; } temp = xhci_port_state_to_neutral(temp); /* FIXME: What new port features do we need to support? */ switch (wValue) { case USB_PORT_FEAT_SUSPEND: temp = xhci_readl(xhci, port_array[wIndex]); /* In spec software should not attempt to suspend * a port unless the port reports that it is in the * enabled (PED = ‘1’,PLS < ‘3’) state. */ if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) || (temp & PORT_PLS_MASK) >= XDEV_U3) { xhci_warn(xhci, "USB core suspending device " "not in U0/U1/U2.\n"); goto error; } slot_id = xhci_find_slot_id_by_port(hcd, xhci, wIndex + 1); if (!slot_id) { xhci_warn(xhci, "slot_id is zero\n"); goto error; } /* unlock to execute stop endpoint commands */ spin_unlock_irqrestore(&xhci->lock, flags); xhci_stop_device(xhci, slot_id, 1); spin_lock_irqsave(&xhci->lock, flags); temp = xhci_port_state_to_neutral(temp); temp &= ~PORT_PLS_MASK; temp |= PORT_LINK_STROBE | XDEV_U3; xhci_writel(xhci, temp, port_array[wIndex]); spin_unlock_irqrestore(&xhci->lock, flags); msleep(10); /* wait device to enter */ spin_lock_irqsave(&xhci->lock, flags); temp = xhci_readl(xhci, port_array[wIndex]); bus_state->suspended_ports |= 1 << wIndex; break; case USB_PORT_FEAT_POWER: /* * Turn on ports, even if there isn't per-port switching. * HC will report connect events even before this is set. * However, khubd will ignore the roothub events until * the roothub is registered. */ xhci_writel(xhci, temp | PORT_POWER, port_array[wIndex]); temp = xhci_readl(xhci, port_array[wIndex]); xhci_dbg(xhci, "set port power, actual port %d status = 0x%x\n", wIndex, temp); break; case USB_PORT_FEAT_RESET: temp = (temp | PORT_RESET); xhci_writel(xhci, temp, port_array[wIndex]); temp = xhci_readl(xhci, port_array[wIndex]); xhci_dbg(xhci, "set port reset, actual port %d status = 0x%x\n", wIndex, temp); break; default: goto error; } /* unblock any posted writes */ temp = xhci_readl(xhci, port_array[wIndex]); break; case ClearPortFeature: if (!wIndex || wIndex > ports) goto error; wIndex--; temp = xhci_readl(xhci, port_array[wIndex]); if (temp == 0xffffffff) { retval = -ENODEV; break; } /* FIXME: What new port features do we need to support? */ temp = xhci_port_state_to_neutral(temp); switch (wValue) { case USB_PORT_FEAT_SUSPEND: temp = xhci_readl(xhci, port_array[wIndex]); xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n"); xhci_dbg(xhci, "PORTSC %04x\n", temp); if (temp & PORT_RESET) goto error; if (temp & XDEV_U3) { if ((temp & PORT_PE) == 0) goto error; if (DEV_SUPERSPEED(temp)) { temp = xhci_port_state_to_neutral(temp); temp &= ~PORT_PLS_MASK; temp |= PORT_LINK_STROBE | XDEV_U0; xhci_writel(xhci, temp, port_array[wIndex]); xhci_readl(xhci, port_array[wIndex]); } else { temp = xhci_port_state_to_neutral(temp); temp &= ~PORT_PLS_MASK; temp |= PORT_LINK_STROBE | XDEV_RESUME; xhci_writel(xhci, temp, port_array[wIndex]); spin_unlock_irqrestore(&xhci->lock, flags); msleep(20); spin_lock_irqsave(&xhci->lock, flags); temp = xhci_readl(xhci, port_array[wIndex]); temp = xhci_port_state_to_neutral(temp); temp &= ~PORT_PLS_MASK; temp |= PORT_LINK_STROBE | XDEV_U0; xhci_writel(xhci, temp, port_array[wIndex]); } bus_state->port_c_suspend |= 1 << wIndex; } slot_id = xhci_find_slot_id_by_port(hcd, xhci, wIndex + 1); if (!slot_id) { xhci_dbg(xhci, "slot_id is zero\n"); goto error; } xhci_ring_device(xhci, slot_id); break; case USB_PORT_FEAT_C_SUSPEND: bus_state->port_c_suspend &= ~(1 << wIndex); case USB_PORT_FEAT_C_RESET: case USB_PORT_FEAT_C_CONNECTION: case USB_PORT_FEAT_C_OVER_CURRENT: case USB_PORT_FEAT_C_ENABLE: xhci_clear_port_change_bit(xhci, wValue, wIndex, port_array[wIndex], temp); break; case USB_PORT_FEAT_ENABLE: xhci_disable_port(hcd, xhci, wIndex, port_array[wIndex], temp); break; default: goto error; } break; default: error: /* "stall" on error */ retval = -EPIPE; } spin_unlock_irqrestore(&xhci->lock, flags); return retval; } /* * Returns 0 if the status hasn't changed, or the number of bytes in buf. * Ports are 0-indexed from the HCD point of view, * and 1-indexed from the USB core pointer of view. * * Note that the status change bits will be cleared as soon as a port status * change event is generated, so we use the saved status from that event. */ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf) { unsigned long flags; u32 temp, status; u32 mask; int i, retval; struct xhci_hcd *xhci = hcd_to_xhci(hcd); int ports; u32 __iomem **port_array; struct xhci_bus_state *bus_state; if (hcd->speed == HCD_USB3) { ports = xhci->num_usb3_ports; port_array = xhci->usb3_ports; } else { ports = xhci->num_usb2_ports; port_array = xhci->usb2_ports; } bus_state = &xhci->bus_state[hcd_index(hcd)]; /* Initial status is no changes */ retval = (ports + 8) / 8; memset(buf, 0, retval); status = 0; mask = PORT_CSC | PORT_PEC | PORT_OCC; spin_lock_irqsave(&xhci->lock, flags); /* For each port, did anything change? If so, set that bit in buf. */ for (i = 0; i < ports; i++) { temp = xhci_readl(xhci, port_array[i]); if (temp == 0xffffffff) { retval = -ENODEV; break; } if ((temp & mask) != 0 || (bus_state->port_c_suspend & 1 << i) || (bus_state->resume_done[i] && time_after_eq( jiffies, bus_state->resume_done[i]))) { buf[(i + 1) / 8] |= 1 << (i + 1) % 8; status = 1; } } spin_unlock_irqrestore(&xhci->lock, flags); return status ? retval : 0; } #ifdef CONFIG_PM int xhci_bus_suspend(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); int max_ports, port_index; u32 __iomem **port_array; struct xhci_bus_state *bus_state; unsigned long flags; if (hcd->speed == HCD_USB3) { max_ports = xhci->num_usb3_ports; port_array = xhci->usb3_ports; xhci_dbg(xhci, "suspend USB 3.0 root hub\n"); } else { max_ports = xhci->num_usb2_ports; port_array = xhci->usb2_ports; xhci_dbg(xhci, "suspend USB 2.0 root hub\n"); } bus_state = &xhci->bus_state[hcd_index(hcd)]; spin_lock_irqsave(&xhci->lock, flags); if (hcd->self.root_hub->do_remote_wakeup) { port_index = max_ports; while (port_index--) { if (bus_state->resume_done[port_index] != 0) { spin_unlock_irqrestore(&xhci->lock, flags); xhci_dbg(xhci, "suspend failed because " "port %d is resuming\n", port_index + 1); return -EBUSY; } } } port_index = max_ports; bus_state->bus_suspended = 0; while (port_index--) { /* suspend the port if the port is not suspended */ u32 t1, t2; int slot_id; t1 = xhci_readl(xhci, port_array[port_index]); t2 = xhci_port_state_to_neutral(t1); if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) { xhci_dbg(xhci, "port %d not suspended\n", port_index); slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1); if (slot_id) { spin_unlock_irqrestore(&xhci->lock, flags); xhci_stop_device(xhci, slot_id, 1); spin_lock_irqsave(&xhci->lock, flags); } t2 &= ~PORT_PLS_MASK; t2 |= PORT_LINK_STROBE | XDEV_U3; set_bit(port_index, &bus_state->bus_suspended); } if (hcd->self.root_hub->do_remote_wakeup) { if (t1 & PORT_CONNECT) { t2 |= PORT_WKOC_E | PORT_WKDISC_E; t2 &= ~PORT_WKCONN_E; } else { t2 |= PORT_WKOC_E | PORT_WKCONN_E; t2 &= ~PORT_WKDISC_E; } } else t2 &= ~PORT_WAKE_BITS; t1 = xhci_port_state_to_neutral(t1); if (t1 != t2) xhci_writel(xhci, t2, port_array[port_index]); if (hcd->speed != HCD_USB3) { /* enable remote wake up for USB 2.0 */ u32 __iomem *addr; u32 tmp; /* Add one to the port status register address to get * the port power control register address. */ addr = port_array[port_index] + 1; tmp = xhci_readl(xhci, addr); tmp |= PORT_RWE; xhci_writel(xhci, tmp, addr); } } hcd->state = HC_STATE_SUSPENDED; bus_state->next_statechange = jiffies + msecs_to_jiffies(10); spin_unlock_irqrestore(&xhci->lock, flags); return 0; } int xhci_bus_resume(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); int max_ports, port_index; u32 __iomem **port_array; struct xhci_bus_state *bus_state; u32 temp; unsigned long flags; if (hcd->speed == HCD_USB3) { max_ports = xhci->num_usb3_ports; port_array = xhci->usb3_ports; xhci_dbg(xhci, "resume USB 3.0 root hub\n"); } else { max_ports = xhci->num_usb2_ports; port_array = xhci->usb2_ports; xhci_dbg(xhci, "resume USB 2.0 root hub\n"); } bus_state = &xhci->bus_state[hcd_index(hcd)]; if (time_before(jiffies, bus_state->next_statechange)) msleep(5); spin_lock_irqsave(&xhci->lock, flags); if (!HCD_HW_ACCESSIBLE(hcd)) { spin_unlock_irqrestore(&xhci->lock, flags); return -ESHUTDOWN; } /* delay the irqs */ temp = xhci_readl(xhci, &xhci->op_regs->command); temp &= ~CMD_EIE; xhci_writel(xhci, temp, &xhci->op_regs->command); port_index = max_ports; while (port_index--) { /* Check whether need resume ports. If needed resume port and disable remote wakeup */ u32 temp; int slot_id; temp = xhci_readl(xhci, port_array[port_index]); if (DEV_SUPERSPEED(temp)) temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS); else temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS); if (test_bit(port_index, &bus_state->bus_suspended) && (temp & PORT_PLS_MASK)) { if (DEV_SUPERSPEED(temp)) { temp = xhci_port_state_to_neutral(temp); temp &= ~PORT_PLS_MASK; temp |= PORT_LINK_STROBE | XDEV_U0; xhci_writel(xhci, temp, port_array[port_index]); } else { temp = xhci_port_state_to_neutral(temp); temp &= ~PORT_PLS_MASK; temp |= PORT_LINK_STROBE | XDEV_RESUME; xhci_writel(xhci, temp, port_array[port_index]); spin_unlock_irqrestore(&xhci->lock, flags); msleep(20); spin_lock_irqsave(&xhci->lock, flags); temp = xhci_readl(xhci, port_array[port_index]); temp = xhci_port_state_to_neutral(temp); temp &= ~PORT_PLS_MASK; temp |= PORT_LINK_STROBE | XDEV_U0; xhci_writel(xhci, temp, port_array[port_index]); } /* wait for the port to enter U0 and report port link * state change. */ spin_unlock_irqrestore(&xhci->lock, flags); msleep(20); spin_lock_irqsave(&xhci->lock, flags); /* Clear PLC */ temp = xhci_readl(xhci, port_array[port_index]); if (temp & PORT_PLC) { temp = xhci_port_state_to_neutral(temp); temp |= PORT_PLC; xhci_writel(xhci, temp, port_array[port_index]); } slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1); if (slot_id) xhci_ring_device(xhci, slot_id); } else xhci_writel(xhci, temp, port_array[port_index]); if (hcd->speed != HCD_USB3) { /* disable remote wake up for USB 2.0 */ u32 __iomem *addr; u32 tmp; /* Add one to the port status register address to get * the port power control register address. */ addr = port_array[port_index] + 1; tmp = xhci_readl(xhci, addr); tmp &= ~PORT_RWE; xhci_writel(xhci, tmp, addr); } } (void) xhci_readl(xhci, &xhci->op_regs->command); bus_state->next_statechange = jiffies + msecs_to_jiffies(5); /* re-enable irqs */ temp = xhci_readl(xhci, &xhci->op_regs->command); temp |= CMD_EIE; xhci_writel(xhci, temp, &xhci->op_regs->command); temp = xhci_readl(xhci, &xhci->op_regs->command); spin_unlock_irqrestore(&xhci->lock, flags); return 0; } #endif /* CONFIG_PM */