// SPDX-License-Identifier: GPL-2.0 /* * xHCI host controller driver * * Copyright (C) 2008 Intel Corp. * * Author: Sarah Sharp * Some code borrowed from the Linux EHCI driver. */ #include #include #include "xhci.h" #include "xhci-trace.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) /* USB 3 BOS descriptor and a capability descriptors, combined. * Fields will be adjusted and added later in xhci_create_usb3_bos_desc() */ static u8 usb_bos_descriptor [] = { USB_DT_BOS_SIZE, /* __u8 bLength, 5 bytes */ USB_DT_BOS, /* __u8 bDescriptorType */ 0x0F, 0x00, /* __le16 wTotalLength, 15 bytes */ 0x1, /* __u8 bNumDeviceCaps */ /* First device capability, SuperSpeed */ USB_DT_USB_SS_CAP_SIZE, /* __u8 bLength, 10 bytes */ USB_DT_DEVICE_CAPABILITY, /* Device Capability */ USB_SS_CAP_TYPE, /* bDevCapabilityType, SUPERSPEED_USB */ 0x00, /* bmAttributes, LTM off by default */ USB_5GBPS_OPERATION, 0x00, /* wSpeedsSupported, 5Gbps only */ 0x03, /* bFunctionalitySupport, USB 3.0 speed only */ 0x00, /* bU1DevExitLat, set later. */ 0x00, 0x00, /* __le16 bU2DevExitLat, set later. */ /* Second device capability, SuperSpeedPlus */ 0x1c, /* bLength 28, will be adjusted later */ USB_DT_DEVICE_CAPABILITY, /* Device Capability */ USB_SSP_CAP_TYPE, /* bDevCapabilityType SUPERSPEED_PLUS */ 0x00, /* bReserved 0 */ 0x23, 0x00, 0x00, 0x00, /* bmAttributes, SSAC=3 SSIC=1 */ 0x01, 0x00, /* wFunctionalitySupport */ 0x00, 0x00, /* wReserved 0 */ /* Default Sublink Speed Attributes, overwrite if custom PSI exists */ 0x34, 0x00, 0x05, 0x00, /* 5Gbps, symmetric, rx, ID = 4 */ 0xb4, 0x00, 0x05, 0x00, /* 5Gbps, symmetric, tx, ID = 4 */ 0x35, 0x40, 0x0a, 0x00, /* 10Gbps, SSP, symmetric, rx, ID = 5 */ 0xb5, 0x40, 0x0a, 0x00, /* 10Gbps, SSP, symmetric, tx, ID = 5 */ }; static int xhci_create_usb3_bos_desc(struct xhci_hcd *xhci, char *buf, u16 wLength) { int i, ssa_count; u32 temp; u16 desc_size, ssp_cap_size, ssa_size = 0; bool usb3_1 = false; desc_size = USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE; ssp_cap_size = sizeof(usb_bos_descriptor) - desc_size; /* does xhci support USB 3.1 Enhanced SuperSpeed */ if (xhci->usb3_rhub.min_rev >= 0x01) { /* does xhci provide a PSI table for SSA speed attributes? */ if (xhci->usb3_rhub.psi_count) { /* two SSA entries for each unique PSI ID, RX and TX */ ssa_count = xhci->usb3_rhub.psi_uid_count * 2; ssa_size = ssa_count * sizeof(u32); ssp_cap_size -= 16; /* skip copying the default SSA */ } desc_size += ssp_cap_size; usb3_1 = true; } memcpy(buf, &usb_bos_descriptor, min(desc_size, wLength)); if (usb3_1) { /* modify bos descriptor bNumDeviceCaps and wTotalLength */ buf[4] += 1; put_unaligned_le16(desc_size + ssa_size, &buf[2]); } if (wLength < USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE) return wLength; /* Indicate whether the host has LTM support. */ temp = readl(&xhci->cap_regs->hcc_params); if (HCC_LTC(temp)) buf[8] |= USB_LTM_SUPPORT; /* Set the U1 and U2 exit latencies. */ if ((xhci->quirks & XHCI_LPM_SUPPORT)) { temp = readl(&xhci->cap_regs->hcs_params3); buf[12] = HCS_U1_LATENCY(temp); put_unaligned_le16(HCS_U2_LATENCY(temp), &buf[13]); } /* If PSI table exists, add the custom speed attributes from it */ if (usb3_1 && xhci->usb3_rhub.psi_count) { u32 ssp_cap_base, bm_attrib, psi, psi_mant, psi_exp; int offset; ssp_cap_base = USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE; if (wLength < desc_size) return wLength; buf[ssp_cap_base] = ssp_cap_size + ssa_size; /* attribute count SSAC bits 4:0 and ID count SSIC bits 8:5 */ bm_attrib = (ssa_count - 1) & 0x1f; bm_attrib |= (xhci->usb3_rhub.psi_uid_count - 1) << 5; put_unaligned_le32(bm_attrib, &buf[ssp_cap_base + 4]); if (wLength < desc_size + ssa_size) return wLength; /* * Create the Sublink Speed Attributes (SSA) array. * The xhci PSI field and USB 3.1 SSA fields are very similar, * but link type bits 7:6 differ for values 01b and 10b. * xhci has also only one PSI entry for a symmetric link when * USB 3.1 requires two SSA entries (RX and TX) for every link */ offset = desc_size; for (i = 0; i < xhci->usb3_rhub.psi_count; i++) { psi = xhci->usb3_rhub.psi[i]; psi &= ~USB_SSP_SUBLINK_SPEED_RSVD; psi_exp = XHCI_EXT_PORT_PSIE(psi); psi_mant = XHCI_EXT_PORT_PSIM(psi); /* Shift to Gbps and set SSP Link BIT(14) if 10Gpbs */ for (; psi_exp < 3; psi_exp++) psi_mant /= 1000; if (psi_mant >= 10) psi |= BIT(14); if ((psi & PLT_MASK) == PLT_SYM) { /* Symmetric, create SSA RX and TX from one PSI entry */ put_unaligned_le32(psi, &buf[offset]); psi |= 1 << 7; /* turn entry to TX */ offset += 4; if (offset >= desc_size + ssa_size) return desc_size + ssa_size; } else if ((psi & PLT_MASK) == PLT_ASYM_RX) { /* Asymetric RX, flip bits 7:6 for SSA */ psi ^= PLT_MASK; } put_unaligned_le32(psi, &buf[offset]); offset += 4; if (offset >= desc_size + ssa_size) return desc_size + ssa_size; } } /* ssa_size is 0 for other than usb 3.1 hosts */ return desc_size + ssa_size; } 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; temp = 0; /* Bits 1:0 - support per-port power switching, or power always on */ if (HCC_PPC(xhci->hcc_params)) temp |= HUB_CHAR_INDV_PORT_LPSM; else temp |= HUB_CHAR_NO_LPSM; /* Bit 2 - root hubs are not part of a compound device */ /* Bits 4:3 - individual port over current protection */ temp |= HUB_CHAR_INDV_PORT_OCPM; /* Bits 6:5 - no TTs in root ports */ /* Bit 7 - no port indicators */ desc->wHubCharacteristics = 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; struct xhci_hub *rhub; rhub = &xhci->usb2_rhub; ports = rhub->num_ports; xhci_common_hub_descriptor(xhci, desc, ports); desc->bDescriptorType = USB_DT_HUB; temp = 1 + (ports / 8); desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 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 = readl(rhub->ports[i]->addr); /* 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; struct xhci_hub *rhub; rhub = &xhci->usb3_rhub; ports = rhub->num_ports; xhci_common_hub_descriptor(xhci, desc, ports); desc->bDescriptorType = USB_DT_SS_HUB; desc->bDescLength = USB_DT_SS_HUB_SIZE; /* 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 = readl(rhub->ports[i]->addr); if (portsc & PORT_DEV_REMOVE) port_removable |= 1 << (i + 1); } desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); } 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] || !xhci->devs[i]->udev) continue; speed = xhci->devs[i]->udev->speed; if (((speed >= USB_SPEED_SUPER) == (hcd->speed >= HCD_USB3)) && xhci->devs[i]->fake_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 ret; int i; ret = 0; virt_dev = xhci->devs[slot_id]; if (!virt_dev) return -ENODEV; trace_xhci_stop_device(virt_dev); cmd = xhci_alloc_command(xhci, true, GFP_NOIO); if (!cmd) 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) { struct xhci_ep_ctx *ep_ctx; struct xhci_command *command; ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->out_ctx, i); /* Check ep is running, required by AMD SNPS 3.1 xHC */ if (GET_EP_CTX_STATE(ep_ctx) != EP_STATE_RUNNING) continue; command = xhci_alloc_command(xhci, false, GFP_NOWAIT); if (!command) { spin_unlock_irqrestore(&xhci->lock, flags); ret = -ENOMEM; goto cmd_cleanup; } ret = xhci_queue_stop_endpoint(xhci, command, slot_id, i, suspend); if (ret) { spin_unlock_irqrestore(&xhci->lock, flags); xhci_free_command(xhci, command); goto cmd_cleanup; } } } ret = xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend); if (ret) { spin_unlock_irqrestore(&xhci->lock, flags); goto cmd_cleanup; } xhci_ring_cmd_db(xhci); spin_unlock_irqrestore(&xhci->lock, flags); /* Wait for last stop endpoint command to finish */ wait_for_completion(cmd->completion); if (cmd->status == COMP_COMMAND_ABORTED || cmd->status == COMP_COMMAND_RING_STOPPED) { xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n"); ret = -ETIME; } cmd_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, s; struct xhci_virt_ep *ep; for (i = 0; i < LAST_EP_INDEX + 1; i++) { ep = &xhci->devs[slot_id]->eps[i]; if (ep->ep_state & EP_HAS_STREAMS) { for (s = 1; s < ep->stream_info->num_streams; s++) xhci_ring_ep_doorbell(xhci, slot_id, i, s); } else if (ep->ring && ep->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, __le32 __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; } if (xhci->quirks & XHCI_BROKEN_PORT_PED) { xhci_dbg(xhci, "Broken Port Enabled/Disabled, ignoring port disable request.\n"); return; } /* Write 1 to disable the port */ writel(port_status | PORT_PE, addr); port_status = readl(addr); xhci_dbg(xhci, "disable port %d-%d, portsc: 0x%x\n", hcd->self.busnum, wIndex + 1, port_status); } static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue, u16 wIndex, __le32 __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_BH_PORT_RESET: status = PORT_WRC; port_change_bit = "warm(BH) 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; case USB_PORT_FEAT_C_PORT_LINK_STATE: status = PORT_PLC; port_change_bit = "link state"; break; case USB_PORT_FEAT_C_PORT_CONFIG_ERROR: status = PORT_CEC; port_change_bit = "config error"; break; default: /* Should never happen */ return; } /* Change bits are all write 1 to clear */ writel(port_status | status, addr); port_status = readl(addr); xhci_dbg(xhci, "clear port%d %s change, portsc: 0x%x\n", wIndex + 1, port_change_bit, port_status); } struct xhci_hub *xhci_get_rhub(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); if (hcd->speed >= HCD_USB3) return &xhci->usb3_rhub; return &xhci->usb2_rhub; } /* * xhci_set_port_power() must be called with xhci->lock held. * It will release and re-aquire the lock while calling ACPI * method. */ static void xhci_set_port_power(struct xhci_hcd *xhci, struct usb_hcd *hcd, u16 index, bool on, unsigned long *flags) { struct xhci_hub *rhub; struct xhci_port *port; u32 temp; rhub = xhci_get_rhub(hcd); port = rhub->ports[index]; temp = readl(port->addr); xhci_dbg(xhci, "set port power %d-%d %s, portsc: 0x%x\n", hcd->self.busnum, index + 1, on ? "ON" : "OFF", temp); temp = xhci_port_state_to_neutral(temp); if (on) { /* Power on */ writel(temp | PORT_POWER, port->addr); readl(port->addr); } else { /* Power off */ writel(temp & ~PORT_POWER, port->addr); } spin_unlock_irqrestore(&xhci->lock, *flags); temp = usb_acpi_power_manageable(hcd->self.root_hub, index); if (temp) usb_acpi_set_power_state(hcd->self.root_hub, index, on); spin_lock_irqsave(&xhci->lock, *flags); } static void xhci_port_set_test_mode(struct xhci_hcd *xhci, u16 test_mode, u16 wIndex) { u32 temp; struct xhci_port *port; /* xhci only supports test mode for usb2 ports */ port = xhci->usb2_rhub.ports[wIndex]; temp = readl(port->addr + PORTPMSC); temp |= test_mode << PORT_TEST_MODE_SHIFT; writel(temp, port->addr + PORTPMSC); xhci->test_mode = test_mode; if (test_mode == TEST_FORCE_EN) xhci_start(xhci); } static int xhci_enter_test_mode(struct xhci_hcd *xhci, u16 test_mode, u16 wIndex, unsigned long *flags) { int i, retval; /* Disable all Device Slots */ xhci_dbg(xhci, "Disable all slots\n"); spin_unlock_irqrestore(&xhci->lock, *flags); for (i = 1; i <= HCS_MAX_SLOTS(xhci->hcs_params1); i++) { if (!xhci->devs[i]) continue; retval = xhci_disable_slot(xhci, i); if (retval) xhci_err(xhci, "Failed to disable slot %d, %d. Enter test mode anyway\n", i, retval); } spin_lock_irqsave(&xhci->lock, *flags); /* Put all ports to the Disable state by clear PP */ xhci_dbg(xhci, "Disable all port (PP = 0)\n"); /* Power off USB3 ports*/ for (i = 0; i < xhci->usb3_rhub.num_ports; i++) xhci_set_port_power(xhci, xhci->shared_hcd, i, false, flags); /* Power off USB2 ports*/ for (i = 0; i < xhci->usb2_rhub.num_ports; i++) xhci_set_port_power(xhci, xhci->main_hcd, i, false, flags); /* Stop the controller */ xhci_dbg(xhci, "Stop controller\n"); retval = xhci_halt(xhci); if (retval) return retval; /* Disable runtime PM for test mode */ pm_runtime_forbid(xhci_to_hcd(xhci)->self.controller); /* Set PORTPMSC.PTC field to enter selected test mode */ /* Port is selected by wIndex. port_id = wIndex + 1 */ xhci_dbg(xhci, "Enter Test Mode: %d, Port_id=%d\n", test_mode, wIndex + 1); xhci_port_set_test_mode(xhci, test_mode, wIndex); return retval; } static int xhci_exit_test_mode(struct xhci_hcd *xhci) { int retval; if (!xhci->test_mode) { xhci_err(xhci, "Not in test mode, do nothing.\n"); return 0; } if (xhci->test_mode == TEST_FORCE_EN && !(xhci->xhc_state & XHCI_STATE_HALTED)) { retval = xhci_halt(xhci); if (retval) return retval; } pm_runtime_allow(xhci_to_hcd(xhci)->self.controller); xhci->test_mode = 0; return xhci_reset(xhci); } void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port, u32 link_state) { u32 temp; u32 portsc; portsc = readl(port->addr); temp = xhci_port_state_to_neutral(portsc); temp &= ~PORT_PLS_MASK; temp |= PORT_LINK_STROBE | link_state; writel(temp, port->addr); xhci_dbg(xhci, "Set port %d-%d link state, portsc: 0x%x, write 0x%x", port->rhub->hcd->self.busnum, port->hcd_portnum + 1, portsc, temp); } static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci, struct xhci_port *port, u16 wake_mask) { u32 temp; temp = readl(port->addr); temp = xhci_port_state_to_neutral(temp); if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_CONNECT) temp |= PORT_WKCONN_E; else temp &= ~PORT_WKCONN_E; if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT) temp |= PORT_WKDISC_E; else temp &= ~PORT_WKDISC_E; if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT) temp |= PORT_WKOC_E; else temp &= ~PORT_WKOC_E; writel(temp, port->addr); } /* Test and clear port RWC bit */ void xhci_test_and_clear_bit(struct xhci_hcd *xhci, struct xhci_port *port, u32 port_bit) { u32 temp; temp = readl(port->addr); if (temp & port_bit) { temp = xhci_port_state_to_neutral(temp); temp |= port_bit; writel(temp, port->addr); } } /* Updates Link Status for super Speed port */ static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci, u32 *status, u32 status_reg) { u32 pls = status_reg & PORT_PLS_MASK; /* resume state is a xHCI internal state. * Do not report it to usb core, instead, pretend to be U3, * thus usb core knows it's not ready for transfer */ if (pls == XDEV_RESUME) { *status |= USB_SS_PORT_LS_U3; return; } /* When the CAS bit is set then warm reset * should be performed on port */ if (status_reg & PORT_CAS) { /* The CAS bit can be set while the port is * in any link state. * Only roothubs have CAS bit, so we * pretend to be in compliance mode * unless we're already in compliance * or the inactive state. */ if (pls != USB_SS_PORT_LS_COMP_MOD && pls != USB_SS_PORT_LS_SS_INACTIVE) { pls = USB_SS_PORT_LS_COMP_MOD; } /* Return also connection bit - * hub state machine resets port * when this bit is set. */ pls |= USB_PORT_STAT_CONNECTION; } else { /* * If CAS bit isn't set but the Port is already at * Compliance Mode, fake a connection so the USB core * notices the Compliance state and resets the port. * This resolves an issue generated by the SN65LVPE502CP * in which sometimes the port enters compliance mode * caused by a delay on the host-device negotiation. */ if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && (pls == USB_SS_PORT_LS_COMP_MOD)) pls |= USB_PORT_STAT_CONNECTION; } /* update status field */ *status |= pls; } /* * Function for Compliance Mode Quirk. * * This Function verifies if all xhc USB3 ports have entered U0, if so, * the compliance mode timer is deleted. A port won't enter * compliance mode if it has previously entered U0. */ static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status, u16 wIndex) { u32 all_ports_seen_u0 = ((1 << xhci->usb3_rhub.num_ports) - 1); bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0); if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK)) return; if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) { xhci->port_status_u0 |= 1 << wIndex; if (xhci->port_status_u0 == all_ports_seen_u0) { del_timer_sync(&xhci->comp_mode_recovery_timer); xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, "All USB3 ports have entered U0 already!"); xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, "Compliance Mode Recovery Timer Deleted."); } } } static int xhci_handle_usb2_port_link_resume(struct xhci_port *port, u32 *status, u32 portsc, unsigned long flags) { struct xhci_bus_state *bus_state; struct xhci_hcd *xhci; struct usb_hcd *hcd; int slot_id; u32 wIndex; hcd = port->rhub->hcd; bus_state = &port->rhub->bus_state; xhci = hcd_to_xhci(hcd); wIndex = port->hcd_portnum; if ((portsc & PORT_RESET) || !(portsc & PORT_PE)) { *status = 0xffffffff; return -EINVAL; } /* did port event handler already start resume timing? */ if (!bus_state->resume_done[wIndex]) { /* If not, maybe we are in a host initated resume? */ if (test_bit(wIndex, &bus_state->resuming_ports)) { /* Host initated resume doesn't time the resume * signalling using resume_done[]. * It manually sets RESUME state, sleeps 20ms * and sets U0 state. This should probably be * changed, but not right now. */ } else { /* port resume was discovered now and here, * start resume timing */ unsigned long timeout = jiffies + msecs_to_jiffies(USB_RESUME_TIMEOUT); set_bit(wIndex, &bus_state->resuming_ports); bus_state->resume_done[wIndex] = timeout; mod_timer(&hcd->rh_timer, timeout); usb_hcd_start_port_resume(&hcd->self, wIndex); } /* Has resume been signalled for USB_RESUME_TIME yet? */ } else if (time_after_eq(jiffies, bus_state->resume_done[wIndex])) { int time_left; xhci_dbg(xhci, "resume USB2 port %d-%d\n", hcd->self.busnum, wIndex + 1); bus_state->resume_done[wIndex] = 0; clear_bit(wIndex, &bus_state->resuming_ports); set_bit(wIndex, &bus_state->rexit_ports); xhci_test_and_clear_bit(xhci, port, PORT_PLC); xhci_set_link_state(xhci, port, XDEV_U0); spin_unlock_irqrestore(&xhci->lock, flags); time_left = wait_for_completion_timeout( &bus_state->rexit_done[wIndex], msecs_to_jiffies(XHCI_MAX_REXIT_TIMEOUT_MS)); spin_lock_irqsave(&xhci->lock, flags); if (time_left) { slot_id = xhci_find_slot_id_by_port(hcd, xhci, wIndex + 1); if (!slot_id) { xhci_dbg(xhci, "slot_id is zero\n"); *status = 0xffffffff; return -ENODEV; } xhci_ring_device(xhci, slot_id); } else { int port_status = readl(port->addr); xhci_warn(xhci, "Port resume timed out, port %d-%d: 0x%x\n", hcd->self.busnum, wIndex + 1, port_status); *status |= USB_PORT_STAT_SUSPEND; clear_bit(wIndex, &bus_state->rexit_ports); } usb_hcd_end_port_resume(&hcd->self, wIndex); bus_state->port_c_suspend |= 1 << wIndex; bus_state->suspended_ports &= ~(1 << wIndex); } else { /* * The resume has been signaling for less than * USB_RESUME_TIME. Report the port status as SUSPEND, * let the usbcore check port status again and clear * resume signaling later. */ *status |= USB_PORT_STAT_SUSPEND; } return 0; } static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li) { u32 ext_stat = 0; int speed_id; /* only support rx and tx lane counts of 1 in usb3.1 spec */ speed_id = DEV_PORT_SPEED(raw_port_status); ext_stat |= speed_id; /* bits 3:0, RX speed id */ ext_stat |= speed_id << 4; /* bits 7:4, TX speed id */ ext_stat |= PORT_RX_LANES(port_li) << 8; /* bits 11:8 Rx lane count */ ext_stat |= PORT_TX_LANES(port_li) << 12; /* bits 15:12 Tx lane count */ return ext_stat; } static void xhci_get_usb3_port_status(struct xhci_port *port, u32 *status, u32 portsc) { struct xhci_bus_state *bus_state; struct xhci_hcd *xhci; u32 link_state; u32 portnum; bus_state = &port->rhub->bus_state; xhci = hcd_to_xhci(port->rhub->hcd); link_state = portsc & PORT_PLS_MASK; portnum = port->hcd_portnum; /* USB3 specific wPortChange bits * * Port link change with port in resume state should not be * reported to usbcore, as this is an internal state to be * handled by xhci driver. Reporting PLC to usbcore may * cause usbcore clearing PLC first and port change event * irq won't be generated. */ if (portsc & PORT_PLC && (link_state != XDEV_RESUME)) *status |= USB_PORT_STAT_C_LINK_STATE << 16; if (portsc & PORT_WRC) *status |= USB_PORT_STAT_C_BH_RESET << 16; if (portsc & PORT_CEC) *status |= USB_PORT_STAT_C_CONFIG_ERROR << 16; /* USB3 specific wPortStatus bits */ if (portsc & PORT_POWER) { *status |= USB_SS_PORT_STAT_POWER; /* link state handling */ if (link_state == XDEV_U0) bus_state->suspended_ports &= ~(1 << portnum); } xhci_hub_report_usb3_link_state(xhci, status, portsc); xhci_del_comp_mod_timer(xhci, portsc, portnum); } static void xhci_get_usb2_port_status(struct xhci_port *port, u32 *status, u32 portsc, unsigned long flags) { struct xhci_bus_state *bus_state; u32 link_state; u32 portnum; int ret; bus_state = &port->rhub->bus_state; link_state = portsc & PORT_PLS_MASK; portnum = port->hcd_portnum; /* USB2 wPortStatus bits */ if (portsc & PORT_POWER) { *status |= USB_PORT_STAT_POWER; /* link state is only valid if port is powered */ if (link_state == XDEV_U3) *status |= USB_PORT_STAT_SUSPEND; if (link_state == XDEV_U2) *status |= USB_PORT_STAT_L1; if (link_state == XDEV_U0) { bus_state->resume_done[portnum] = 0; clear_bit(portnum, &bus_state->resuming_ports); if (bus_state->suspended_ports & (1 << portnum)) { bus_state->suspended_ports &= ~(1 << portnum); bus_state->port_c_suspend |= 1 << portnum; } } if (link_state == XDEV_RESUME) { ret = xhci_handle_usb2_port_link_resume(port, status, portsc, flags); if (ret) return; } } } /* * Converts a raw xHCI port status into the format that external USB 2.0 or USB * 3.0 hubs use. * * Possible side effects: * - Mark a port as being done with device resume, * and ring the endpoint doorbells. * - Stop the Synopsys redriver Compliance Mode polling. * - Drop and reacquire the xHCI lock, in order to wait for port resume. */ static u32 xhci_get_port_status(struct usb_hcd *hcd, struct xhci_bus_state *bus_state, u16 wIndex, u32 raw_port_status, unsigned long flags) __releases(&xhci->lock) __acquires(&xhci->lock) { u32 status = 0; struct xhci_hub *rhub; struct xhci_port *port; rhub = xhci_get_rhub(hcd); port = rhub->ports[wIndex]; /* common wPortChange bits */ if (raw_port_status & PORT_CSC) status |= USB_PORT_STAT_C_CONNECTION << 16; if (raw_port_status & PORT_PEC) status |= USB_PORT_STAT_C_ENABLE << 16; if ((raw_port_status & PORT_OCC)) status |= USB_PORT_STAT_C_OVERCURRENT << 16; if ((raw_port_status & PORT_RC)) status |= USB_PORT_STAT_C_RESET << 16; /* common wPortStatus bits */ if (raw_port_status & PORT_CONNECT) { status |= USB_PORT_STAT_CONNECTION; status |= xhci_port_speed(raw_port_status); } if (raw_port_status & PORT_PE) status |= USB_PORT_STAT_ENABLE; if (raw_port_status & PORT_OC) status |= USB_PORT_STAT_OVERCURRENT; if (raw_port_status & PORT_RESET) status |= USB_PORT_STAT_RESET; /* USB2 and USB3 specific bits, including Port Link State */ if (hcd->speed >= HCD_USB3) xhci_get_usb3_port_status(port, &status, raw_port_status); else xhci_get_usb2_port_status(port, &status, raw_port_status, flags); /* * Clear stale usb2 resume signalling variables in case port changed * state during resume signalling. For example on error */ if ((bus_state->resume_done[wIndex] || test_bit(wIndex, &bus_state->resuming_ports)) && (raw_port_status & PORT_PLS_MASK) != XDEV_U3 && (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME) { bus_state->resume_done[wIndex] = 0; clear_bit(wIndex, &bus_state->resuming_ports); usb_hcd_end_port_resume(&hcd->self, wIndex); } if (bus_state->port_c_suspend & (1 << wIndex)) status |= USB_PORT_STAT_C_SUSPEND << 16; return 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 max_ports; unsigned long flags; u32 temp, status; int retval = 0; int slot_id; struct xhci_bus_state *bus_state; u16 link_state = 0; u16 wake_mask = 0; u16 timeout = 0; u16 test_mode = 0; struct xhci_hub *rhub; struct xhci_port **ports; rhub = xhci_get_rhub(hcd); ports = rhub->ports; max_ports = rhub->num_ports; bus_state = &rhub->bus_state; 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 DeviceRequest | USB_REQ_GET_DESCRIPTOR: if ((wValue & 0xff00) != (USB_DT_BOS << 8)) goto error; if (hcd->speed < HCD_USB3) goto error; retval = xhci_create_usb3_bos_desc(xhci, buf, wLength); spin_unlock_irqrestore(&xhci->lock, flags); return retval; case GetPortStatus: if (!wIndex || wIndex > max_ports) goto error; wIndex--; temp = readl(ports[wIndex]->addr); if (temp == ~(u32)0) { xhci_hc_died(xhci); retval = -ENODEV; break; } trace_xhci_get_port_status(wIndex, temp); status = xhci_get_port_status(hcd, bus_state, wIndex, temp, flags); if (status == 0xffffffff) goto error; xhci_dbg(xhci, "Get port status %d-%d read: 0x%x, return 0x%x", hcd->self.busnum, wIndex + 1, temp, status); put_unaligned(cpu_to_le32(status), (__le32 *) buf); /* if USB 3.1 extended port status return additional 4 bytes */ if (wValue == 0x02) { u32 port_li; if (hcd->speed < HCD_USB31 || wLength != 8) { xhci_err(xhci, "get ext port status invalid parameter\n"); retval = -EINVAL; break; } port_li = readl(ports[wIndex]->addr + PORTLI); status = xhci_get_ext_port_status(temp, port_li); put_unaligned_le32(cpu_to_le32(status), &buf[4]); } break; case SetPortFeature: if (wValue == USB_PORT_FEAT_LINK_STATE) link_state = (wIndex & 0xff00) >> 3; if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK) wake_mask = wIndex & 0xff00; if (wValue == USB_PORT_FEAT_TEST) test_mode = (wIndex & 0xff00) >> 8; /* The MSB of wIndex is the U1/U2 timeout */ timeout = (wIndex & 0xff00) >> 8; wIndex &= 0xff; if (!wIndex || wIndex > max_ports) goto error; wIndex--; temp = readl(ports[wIndex]->addr); if (temp == ~(u32)0) { xhci_hc_died(xhci); 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 = readl(ports[wIndex]->addr); if ((temp & PORT_PLS_MASK) != XDEV_U0) { /* Resume the port to U0 first */ xhci_set_link_state(xhci, ports[wIndex], XDEV_U0); spin_unlock_irqrestore(&xhci->lock, flags); msleep(10); spin_lock_irqsave(&xhci->lock, flags); } /* 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. */ temp = readl(ports[wIndex]->addr); if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) || (temp & PORT_PLS_MASK) >= XDEV_U3) { xhci_warn(xhci, "USB core suspending port %d-%d not in U0/U1/U2\n", hcd->self.busnum, wIndex + 1); 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); xhci_set_link_state(xhci, ports[wIndex], XDEV_U3); spin_unlock_irqrestore(&xhci->lock, flags); msleep(10); /* wait device to enter */ spin_lock_irqsave(&xhci->lock, flags); temp = readl(ports[wIndex]->addr); bus_state->suspended_ports |= 1 << wIndex; break; case USB_PORT_FEAT_LINK_STATE: temp = readl(ports[wIndex]->addr); /* Disable port */ if (link_state == USB_SS_PORT_LS_SS_DISABLED) { xhci_dbg(xhci, "Disable port %d\n", wIndex); temp = xhci_port_state_to_neutral(temp); /* * Clear all change bits, so that we get a new * connection event. */ temp |= PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | PORT_RC | PORT_PLC | PORT_CEC; writel(temp | PORT_PE, ports[wIndex]->addr); temp = readl(ports[wIndex]->addr); break; } /* Put link in RxDetect (enable port) */ if (link_state == USB_SS_PORT_LS_RX_DETECT) { xhci_dbg(xhci, "Enable port %d\n", wIndex); xhci_set_link_state(xhci, ports[wIndex], link_state); temp = readl(ports[wIndex]->addr); break; } /* * For xHCI 1.1 according to section 4.19.1.2.4.1 a * root hub port's transition to compliance mode upon * detecting LFPS timeout may be controlled by an * Compliance Transition Enabled (CTE) flag (not * software visible). This flag is set by writing 0xA * to PORTSC PLS field which will allow transition to * compliance mode the next time LFPS timeout is * encountered. A warm reset will clear it. * * The CTE flag is only supported if the HCCPARAMS2 CTC * flag is set, otherwise, the compliance substate is * automatically entered as on 1.0 and prior. */ if (link_state == USB_SS_PORT_LS_COMP_MOD) { if (!HCC2_CTC(xhci->hcc_params2)) { xhci_dbg(xhci, "CTC flag is 0, port already supports entering compliance mode\n"); break; } if ((temp & PORT_CONNECT)) { xhci_warn(xhci, "Can't set compliance mode when port is connected\n"); goto error; } xhci_dbg(xhci, "Enable compliance mode transition for port %d\n", wIndex); xhci_set_link_state(xhci, ports[wIndex], link_state); temp = readl(ports[wIndex]->addr); break; } /* Port must be enabled */ if (!(temp & PORT_PE)) { retval = -ENODEV; break; } /* Can't set port link state above '3' (U3) */ if (link_state > USB_SS_PORT_LS_U3) { xhci_warn(xhci, "Cannot set port %d link state %d\n", wIndex, link_state); goto error; } if (link_state == USB_SS_PORT_LS_U3) { slot_id = xhci_find_slot_id_by_port(hcd, xhci, wIndex + 1); if (slot_id) { /* 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); } } xhci_set_link_state(xhci, ports[wIndex], link_state); spin_unlock_irqrestore(&xhci->lock, flags); msleep(20); /* wait device to enter */ spin_lock_irqsave(&xhci->lock, flags); temp = readl(ports[wIndex]->addr); if (link_state == USB_SS_PORT_LS_U3) 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, hub_wq will ignore the roothub events until * the roothub is registered. */ xhci_set_port_power(xhci, hcd, wIndex, true, &flags); break; case USB_PORT_FEAT_RESET: temp = (temp | PORT_RESET); writel(temp, ports[wIndex]->addr); temp = readl(ports[wIndex]->addr); xhci_dbg(xhci, "set port reset, actual port %d status = 0x%x\n", wIndex, temp); break; case USB_PORT_FEAT_REMOTE_WAKE_MASK: xhci_set_remote_wake_mask(xhci, ports[wIndex], wake_mask); temp = readl(ports[wIndex]->addr); xhci_dbg(xhci, "set port remote wake mask, " "actual port %d status = 0x%x\n", wIndex, temp); break; case USB_PORT_FEAT_BH_PORT_RESET: temp |= PORT_WR; writel(temp, ports[wIndex]->addr); temp = readl(ports[wIndex]->addr); break; case USB_PORT_FEAT_U1_TIMEOUT: if (hcd->speed < HCD_USB3) goto error; temp = readl(ports[wIndex]->addr + PORTPMSC); temp &= ~PORT_U1_TIMEOUT_MASK; temp |= PORT_U1_TIMEOUT(timeout); writel(temp, ports[wIndex]->addr + PORTPMSC); break; case USB_PORT_FEAT_U2_TIMEOUT: if (hcd->speed < HCD_USB3) goto error; temp = readl(ports[wIndex]->addr + PORTPMSC); temp &= ~PORT_U2_TIMEOUT_MASK; temp |= PORT_U2_TIMEOUT(timeout); writel(temp, ports[wIndex]->addr + PORTPMSC); break; case USB_PORT_FEAT_TEST: /* 4.19.6 Port Test Modes (USB2 Test Mode) */ if (hcd->speed != HCD_USB2) goto error; if (test_mode > TEST_FORCE_EN || test_mode < TEST_J) goto error; retval = xhci_enter_test_mode(xhci, test_mode, wIndex, &flags); break; default: goto error; } /* unblock any posted writes */ temp = readl(ports[wIndex]->addr); break; case ClearPortFeature: if (!wIndex || wIndex > max_ports) goto error; wIndex--; temp = readl(ports[wIndex]->addr); if (temp == ~(u32)0) { xhci_hc_died(xhci); 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 = readl(ports[wIndex]->addr); xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n"); xhci_dbg(xhci, "PORTSC %04x\n", temp); if (temp & PORT_RESET) goto error; if ((temp & PORT_PLS_MASK) == XDEV_U3) { if ((temp & PORT_PE) == 0) goto error; set_bit(wIndex, &bus_state->resuming_ports); usb_hcd_start_port_resume(&hcd->self, wIndex); xhci_set_link_state(xhci, ports[wIndex], XDEV_RESUME); spin_unlock_irqrestore(&xhci->lock, flags); msleep(USB_RESUME_TIMEOUT); spin_lock_irqsave(&xhci->lock, flags); xhci_set_link_state(xhci, ports[wIndex], XDEV_U0); clear_bit(wIndex, &bus_state->resuming_ports); usb_hcd_end_port_resume(&hcd->self, 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); /* fall through */ case USB_PORT_FEAT_C_RESET: case USB_PORT_FEAT_C_BH_PORT_RESET: case USB_PORT_FEAT_C_CONNECTION: case USB_PORT_FEAT_C_OVER_CURRENT: case USB_PORT_FEAT_C_ENABLE: case USB_PORT_FEAT_C_PORT_LINK_STATE: case USB_PORT_FEAT_C_PORT_CONFIG_ERROR: xhci_clear_port_change_bit(xhci, wValue, wIndex, ports[wIndex]->addr, temp); break; case USB_PORT_FEAT_ENABLE: xhci_disable_port(hcd, xhci, wIndex, ports[wIndex]->addr, temp); break; case USB_PORT_FEAT_POWER: xhci_set_port_power(xhci, hcd, wIndex, false, &flags); break; case USB_PORT_FEAT_TEST: retval = xhci_exit_test_mode(xhci); 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 max_ports; struct xhci_bus_state *bus_state; bool reset_change = false; struct xhci_hub *rhub; struct xhci_port **ports; rhub = xhci_get_rhub(hcd); ports = rhub->ports; max_ports = rhub->num_ports; bus_state = &rhub->bus_state; /* Initial status is no changes */ retval = (max_ports + 8) / 8; memset(buf, 0, retval); /* * Inform the usbcore about resume-in-progress by returning * a non-zero value even if there are no status changes. */ status = bus_state->resuming_ports; mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC; spin_lock_irqsave(&xhci->lock, flags); /* For each port, did anything change? If so, set that bit in buf. */ for (i = 0; i < max_ports; i++) { temp = readl(ports[i]->addr); if (temp == ~(u32)0) { xhci_hc_died(xhci); retval = -ENODEV; break; } trace_xhci_hub_status_data(i, temp); 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; } if ((temp & PORT_RC)) reset_change = true; } if (!status && !reset_change) { xhci_dbg(xhci, "%s: stopping port polling.\n", __func__); clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); } 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; struct xhci_bus_state *bus_state; unsigned long flags; struct xhci_hub *rhub; struct xhci_port **ports; u32 portsc_buf[USB_MAXCHILDREN]; bool wake_enabled; rhub = xhci_get_rhub(hcd); ports = rhub->ports; max_ports = rhub->num_ports; bus_state = &rhub->bus_state; wake_enabled = hcd->self.root_hub->do_remote_wakeup; spin_lock_irqsave(&xhci->lock, flags); if (wake_enabled) { if (bus_state->resuming_ports || /* USB2 */ bus_state->port_remote_wakeup) { /* USB3 */ spin_unlock_irqrestore(&xhci->lock, flags); xhci_dbg(xhci, "suspend failed because a port is resuming\n"); return -EBUSY; } } /* * Prepare ports for suspend, but don't write anything before all ports * are checked and we know bus suspend can proceed */ bus_state->bus_suspended = 0; port_index = max_ports; while (port_index--) { u32 t1, t2; int retries = 10; retry: t1 = readl(ports[port_index]->addr); t2 = xhci_port_state_to_neutral(t1); portsc_buf[port_index] = 0; /* * Give a USB3 port in link training time to finish, but don't * prevent suspend as port might be stuck */ if ((hcd->speed >= HCD_USB3) && retries-- && (t1 & PORT_PLS_MASK) == XDEV_POLLING) { spin_unlock_irqrestore(&xhci->lock, flags); msleep(XHCI_PORT_POLLING_LFPS_TIME); spin_lock_irqsave(&xhci->lock, flags); xhci_dbg(xhci, "port %d polling in bus suspend, waiting\n", port_index); goto retry; } /* suspend ports in U0, or bail out for new connect changes */ if ((t1 & PORT_PE) && (t1 & PORT_PLS_MASK) == XDEV_U0) { if ((t1 & PORT_CSC) && wake_enabled) { bus_state->bus_suspended = 0; spin_unlock_irqrestore(&xhci->lock, flags); xhci_dbg(xhci, "Bus suspend bailout, port connect change\n"); return -EBUSY; } xhci_dbg(xhci, "port %d not suspended\n", port_index); t2 &= ~PORT_PLS_MASK; t2 |= PORT_LINK_STROBE | XDEV_U3; set_bit(port_index, &bus_state->bus_suspended); } /* USB core sets remote wake mask for USB 3.0 hubs, * including the USB 3.0 roothub, but only if CONFIG_PM * is enabled, so also enable remote wake here. */ if (wake_enabled) { 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; } if ((xhci->quirks & XHCI_U2_DISABLE_WAKE) && (hcd->speed < HCD_USB3)) { if (usb_amd_pt_check_port(hcd->self.controller, port_index)) t2 &= ~PORT_WAKE_BITS; } } else t2 &= ~PORT_WAKE_BITS; t1 = xhci_port_state_to_neutral(t1); if (t1 != t2) portsc_buf[port_index] = t2; } /* write port settings, stopping and suspending ports if needed */ port_index = max_ports; while (port_index--) { if (!portsc_buf[port_index]) continue; if (test_bit(port_index, &bus_state->bus_suspended)) { int slot_id; 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); } } writel(portsc_buf[port_index], ports[port_index]->addr); } hcd->state = HC_STATE_SUSPENDED; bus_state->next_statechange = jiffies + msecs_to_jiffies(10); spin_unlock_irqrestore(&xhci->lock, flags); return 0; } /* * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3. * warm reset a USB3 device stuck in polling or compliance mode after resume. * See Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8 */ static bool xhci_port_missing_cas_quirk(struct xhci_port *port) { u32 portsc; portsc = readl(port->addr); /* if any of these are set we are not stuck */ if (portsc & (PORT_CONNECT | PORT_CAS)) return false; if (((portsc & PORT_PLS_MASK) != XDEV_POLLING) && ((portsc & PORT_PLS_MASK) != XDEV_COMP_MODE)) return false; /* clear wakeup/change bits, and do a warm port reset */ portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS); portsc |= PORT_WR; writel(portsc, port->addr); /* flush write */ readl(port->addr); return true; } int xhci_bus_resume(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); struct xhci_bus_state *bus_state; unsigned long flags; int max_ports, port_index; int slot_id; int sret; u32 next_state; u32 temp, portsc; struct xhci_hub *rhub; struct xhci_port **ports; rhub = xhci_get_rhub(hcd); ports = rhub->ports; max_ports = rhub->num_ports; bus_state = &rhub->bus_state; 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 = readl(&xhci->op_regs->command); temp &= ~CMD_EIE; writel(temp, &xhci->op_regs->command); /* bus specific resume for ports we suspended at bus_suspend */ if (hcd->speed >= HCD_USB3) next_state = XDEV_U0; else next_state = XDEV_RESUME; port_index = max_ports; while (port_index--) { portsc = readl(ports[port_index]->addr); /* warm reset CAS limited ports stuck in polling/compliance */ if ((xhci->quirks & XHCI_MISSING_CAS) && (hcd->speed >= HCD_USB3) && xhci_port_missing_cas_quirk(ports[port_index])) { xhci_dbg(xhci, "reset stuck port %d\n", port_index); clear_bit(port_index, &bus_state->bus_suspended); continue; } /* resume if we suspended the link, and it is still suspended */ if (test_bit(port_index, &bus_state->bus_suspended)) switch (portsc & PORT_PLS_MASK) { case XDEV_U3: portsc = xhci_port_state_to_neutral(portsc); portsc &= ~PORT_PLS_MASK; portsc |= PORT_LINK_STROBE | next_state; break; case XDEV_RESUME: /* resume already initiated */ break; default: /* not in a resumeable state, ignore it */ clear_bit(port_index, &bus_state->bus_suspended); break; } /* disable wake for all ports, write new link state if needed */ portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS); writel(portsc, ports[port_index]->addr); } /* USB2 specific resume signaling delay and U0 link state transition */ if (hcd->speed < HCD_USB3) { if (bus_state->bus_suspended) { spin_unlock_irqrestore(&xhci->lock, flags); msleep(USB_RESUME_TIMEOUT); spin_lock_irqsave(&xhci->lock, flags); } for_each_set_bit(port_index, &bus_state->bus_suspended, BITS_PER_LONG) { /* Clear PLC to poll it later for U0 transition */ xhci_test_and_clear_bit(xhci, ports[port_index], PORT_PLC); xhci_set_link_state(xhci, ports[port_index], XDEV_U0); } } /* poll for U0 link state complete, both USB2 and USB3 */ for_each_set_bit(port_index, &bus_state->bus_suspended, BITS_PER_LONG) { sret = xhci_handshake(ports[port_index]->addr, PORT_PLC, PORT_PLC, 10 * 1000); if (sret) { xhci_warn(xhci, "port %d resume PLC timeout\n", port_index); continue; } xhci_test_and_clear_bit(xhci, ports[port_index], PORT_PLC); slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1); if (slot_id) xhci_ring_device(xhci, slot_id); } (void) readl(&xhci->op_regs->command); bus_state->next_statechange = jiffies + msecs_to_jiffies(5); /* re-enable irqs */ temp = readl(&xhci->op_regs->command); temp |= CMD_EIE; writel(temp, &xhci->op_regs->command); temp = readl(&xhci->op_regs->command); spin_unlock_irqrestore(&xhci->lock, flags); return 0; } unsigned long xhci_get_resuming_ports(struct usb_hcd *hcd) { struct xhci_hub *rhub = xhci_get_rhub(hcd); /* USB3 port wakeups are reported via usb_wakeup_notification() */ return rhub->bus_state.resuming_ports; /* USB2 ports only */ } #endif /* CONFIG_PM */