/* * This file contains code to reset and initialize USB host controllers. * Some of it includes work-arounds for PCI hardware and BIOS quirks. * It may need to run early during booting -- before USB would normally * initialize -- to ensure that Linux doesn't use any legacy modes. * * Copyright (c) 1999 Martin Mares * (and others) */ #include #include #include #include #include #include #include #include "pci-quirks.h" #include "xhci-ext-caps.h" #define UHCI_USBLEGSUP 0xc0 /* legacy support */ #define UHCI_USBCMD 0 /* command register */ #define UHCI_USBINTR 4 /* interrupt register */ #define UHCI_USBLEGSUP_RWC 0x8f00 /* the R/WC bits */ #define UHCI_USBLEGSUP_RO 0x5040 /* R/O and reserved bits */ #define UHCI_USBCMD_RUN 0x0001 /* RUN/STOP bit */ #define UHCI_USBCMD_HCRESET 0x0002 /* Host Controller reset */ #define UHCI_USBCMD_EGSM 0x0008 /* Global Suspend Mode */ #define UHCI_USBCMD_CONFIGURE 0x0040 /* Config Flag */ #define UHCI_USBINTR_RESUME 0x0002 /* Resume interrupt enable */ #define OHCI_CONTROL 0x04 #define OHCI_CMDSTATUS 0x08 #define OHCI_INTRSTATUS 0x0c #define OHCI_INTRENABLE 0x10 #define OHCI_INTRDISABLE 0x14 #define OHCI_FMINTERVAL 0x34 #define OHCI_HCFS (3 << 6) /* hc functional state */ #define OHCI_HCR (1 << 0) /* host controller reset */ #define OHCI_OCR (1 << 3) /* ownership change request */ #define OHCI_CTRL_RWC (1 << 9) /* remote wakeup connected */ #define OHCI_CTRL_IR (1 << 8) /* interrupt routing */ #define OHCI_INTR_OC (1 << 30) /* ownership change */ #define EHCI_HCC_PARAMS 0x08 /* extended capabilities */ #define EHCI_USBCMD 0 /* command register */ #define EHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */ #define EHCI_USBSTS 4 /* status register */ #define EHCI_USBSTS_HALTED (1 << 12) /* HCHalted bit */ #define EHCI_USBINTR 8 /* interrupt register */ #define EHCI_CONFIGFLAG 0x40 /* configured flag register */ #define EHCI_USBLEGSUP 0 /* legacy support register */ #define EHCI_USBLEGSUP_BIOS (1 << 16) /* BIOS semaphore */ #define EHCI_USBLEGSUP_OS (1 << 24) /* OS semaphore */ #define EHCI_USBLEGCTLSTS 4 /* legacy control/status */ #define EHCI_USBLEGCTLSTS_SOOE (1 << 13) /* SMI on ownership change */ /* AMD quirk use */ #define AB_REG_BAR_LOW 0xe0 #define AB_REG_BAR_HIGH 0xe1 #define AB_REG_BAR_SB700 0xf0 #define AB_INDX(addr) ((addr) + 0x00) #define AB_DATA(addr) ((addr) + 0x04) #define AX_INDXC 0x30 #define AX_DATAC 0x34 #define NB_PCIE_INDX_ADDR 0xe0 #define NB_PCIE_INDX_DATA 0xe4 #define PCIE_P_CNTL 0x10040 #define BIF_NB 0x10002 #define NB_PIF0_PWRDOWN_0 0x01100012 #define NB_PIF0_PWRDOWN_1 0x01100013 #define USB_INTEL_XUSB2PR 0xD0 #define USB_INTEL_USB2PRM 0xD4 #define USB_INTEL_USB3_PSSEN 0xD8 #define USB_INTEL_USB3PRM 0xDC static struct amd_chipset_info { struct pci_dev *nb_dev; struct pci_dev *smbus_dev; int nb_type; int sb_type; int isoc_reqs; int probe_count; int probe_result; } amd_chipset; static DEFINE_SPINLOCK(amd_lock); int usb_amd_find_chipset_info(void) { u8 rev = 0; unsigned long flags; struct amd_chipset_info info; int ret; spin_lock_irqsave(&amd_lock, flags); /* probe only once */ if (amd_chipset.probe_count > 0) { amd_chipset.probe_count++; spin_unlock_irqrestore(&amd_lock, flags); return amd_chipset.probe_result; } memset(&info, 0, sizeof(info)); spin_unlock_irqrestore(&amd_lock, flags); info.smbus_dev = pci_get_device(PCI_VENDOR_ID_ATI, 0x4385, NULL); if (info.smbus_dev) { rev = info.smbus_dev->revision; if (rev >= 0x40) info.sb_type = 1; else if (rev >= 0x30 && rev <= 0x3b) info.sb_type = 3; } else { info.smbus_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x780b, NULL); if (!info.smbus_dev) { ret = 0; goto commit; } rev = info.smbus_dev->revision; if (rev >= 0x11 && rev <= 0x18) info.sb_type = 2; } if (info.sb_type == 0) { if (info.smbus_dev) { pci_dev_put(info.smbus_dev); info.smbus_dev = NULL; } ret = 0; goto commit; } info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x9601, NULL); if (info.nb_dev) { info.nb_type = 1; } else { info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x1510, NULL); if (info.nb_dev) { info.nb_type = 2; } else { info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x9600, NULL); if (info.nb_dev) info.nb_type = 3; } } ret = info.probe_result = 1; printk(KERN_DEBUG "QUIRK: Enable AMD PLL fix\n"); commit: spin_lock_irqsave(&amd_lock, flags); if (amd_chipset.probe_count > 0) { /* race - someone else was faster - drop devices */ /* Mark that we where here */ amd_chipset.probe_count++; ret = amd_chipset.probe_result; spin_unlock_irqrestore(&amd_lock, flags); if (info.nb_dev) pci_dev_put(info.nb_dev); if (info.smbus_dev) pci_dev_put(info.smbus_dev); } else { /* no race - commit the result */ info.probe_count++; amd_chipset = info; spin_unlock_irqrestore(&amd_lock, flags); } return ret; } EXPORT_SYMBOL_GPL(usb_amd_find_chipset_info); /* * The hardware normally enables the A-link power management feature, which * lets the system lower the power consumption in idle states. * * This USB quirk prevents the link going into that lower power state * during isochronous transfers. * * Without this quirk, isochronous stream on OHCI/EHCI/xHCI controllers of * some AMD platforms may stutter or have breaks occasionally. */ static void usb_amd_quirk_pll(int disable) { u32 addr, addr_low, addr_high, val; u32 bit = disable ? 0 : 1; unsigned long flags; spin_lock_irqsave(&amd_lock, flags); if (disable) { amd_chipset.isoc_reqs++; if (amd_chipset.isoc_reqs > 1) { spin_unlock_irqrestore(&amd_lock, flags); return; } } else { amd_chipset.isoc_reqs--; if (amd_chipset.isoc_reqs > 0) { spin_unlock_irqrestore(&amd_lock, flags); return; } } if (amd_chipset.sb_type == 1 || amd_chipset.sb_type == 2) { outb_p(AB_REG_BAR_LOW, 0xcd6); addr_low = inb_p(0xcd7); outb_p(AB_REG_BAR_HIGH, 0xcd6); addr_high = inb_p(0xcd7); addr = addr_high << 8 | addr_low; outl_p(0x30, AB_INDX(addr)); outl_p(0x40, AB_DATA(addr)); outl_p(0x34, AB_INDX(addr)); val = inl_p(AB_DATA(addr)); } else if (amd_chipset.sb_type == 3) { pci_read_config_dword(amd_chipset.smbus_dev, AB_REG_BAR_SB700, &addr); outl(AX_INDXC, AB_INDX(addr)); outl(0x40, AB_DATA(addr)); outl(AX_DATAC, AB_INDX(addr)); val = inl(AB_DATA(addr)); } else { spin_unlock_irqrestore(&amd_lock, flags); return; } if (disable) { val &= ~0x08; val |= (1 << 4) | (1 << 9); } else { val |= 0x08; val &= ~((1 << 4) | (1 << 9)); } outl_p(val, AB_DATA(addr)); if (!amd_chipset.nb_dev) { spin_unlock_irqrestore(&amd_lock, flags); return; } if (amd_chipset.nb_type == 1 || amd_chipset.nb_type == 3) { addr = PCIE_P_CNTL; pci_write_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_ADDR, addr); pci_read_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_DATA, &val); val &= ~(1 | (1 << 3) | (1 << 4) | (1 << 9) | (1 << 12)); val |= bit | (bit << 3) | (bit << 12); val |= ((!bit) << 4) | ((!bit) << 9); pci_write_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_DATA, val); addr = BIF_NB; pci_write_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_ADDR, addr); pci_read_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_DATA, &val); val &= ~(1 << 8); val |= bit << 8; pci_write_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_DATA, val); } else if (amd_chipset.nb_type == 2) { addr = NB_PIF0_PWRDOWN_0; pci_write_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_ADDR, addr); pci_read_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_DATA, &val); if (disable) val &= ~(0x3f << 7); else val |= 0x3f << 7; pci_write_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_DATA, val); addr = NB_PIF0_PWRDOWN_1; pci_write_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_ADDR, addr); pci_read_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_DATA, &val); if (disable) val &= ~(0x3f << 7); else val |= 0x3f << 7; pci_write_config_dword(amd_chipset.nb_dev, NB_PCIE_INDX_DATA, val); } spin_unlock_irqrestore(&amd_lock, flags); return; } void usb_amd_quirk_pll_disable(void) { usb_amd_quirk_pll(1); } EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_disable); void usb_amd_quirk_pll_enable(void) { usb_amd_quirk_pll(0); } EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_enable); void usb_amd_dev_put(void) { struct pci_dev *nb, *smbus; unsigned long flags; spin_lock_irqsave(&amd_lock, flags); amd_chipset.probe_count--; if (amd_chipset.probe_count > 0) { spin_unlock_irqrestore(&amd_lock, flags); return; } /* save them to pci_dev_put outside of spinlock */ nb = amd_chipset.nb_dev; smbus = amd_chipset.smbus_dev; amd_chipset.nb_dev = NULL; amd_chipset.smbus_dev = NULL; amd_chipset.nb_type = 0; amd_chipset.sb_type = 0; amd_chipset.isoc_reqs = 0; amd_chipset.probe_result = 0; spin_unlock_irqrestore(&amd_lock, flags); if (nb) pci_dev_put(nb); if (smbus) pci_dev_put(smbus); } EXPORT_SYMBOL_GPL(usb_amd_dev_put); /* * Make sure the controller is completely inactive, unable to * generate interrupts or do DMA. */ void uhci_reset_hc(struct pci_dev *pdev, unsigned long base) { /* Turn off PIRQ enable and SMI enable. (This also turns off the * BIOS's USB Legacy Support.) Turn off all the R/WC bits too. */ pci_write_config_word(pdev, UHCI_USBLEGSUP, UHCI_USBLEGSUP_RWC); /* Reset the HC - this will force us to get a * new notification of any already connected * ports due to the virtual disconnect that it * implies. */ outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD); mb(); udelay(5); if (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET) dev_warn(&pdev->dev, "HCRESET not completed yet!\n"); /* Just to be safe, disable interrupt requests and * make sure the controller is stopped. */ outw(0, base + UHCI_USBINTR); outw(0, base + UHCI_USBCMD); } EXPORT_SYMBOL_GPL(uhci_reset_hc); /* * Initialize a controller that was newly discovered or has just been * resumed. In either case we can't be sure of its previous state. * * Returns: 1 if the controller was reset, 0 otherwise. */ int uhci_check_and_reset_hc(struct pci_dev *pdev, unsigned long base) { u16 legsup; unsigned int cmd, intr; /* * When restarting a suspended controller, we expect all the * settings to be the same as we left them: * * PIRQ and SMI disabled, no R/W bits set in USBLEGSUP; * Controller is stopped and configured with EGSM set; * No interrupts enabled except possibly Resume Detect. * * If any of these conditions are violated we do a complete reset. */ pci_read_config_word(pdev, UHCI_USBLEGSUP, &legsup); if (legsup & ~(UHCI_USBLEGSUP_RO | UHCI_USBLEGSUP_RWC)) { dev_dbg(&pdev->dev, "%s: legsup = 0x%04x\n", __func__, legsup); goto reset_needed; } cmd = inw(base + UHCI_USBCMD); if ((cmd & UHCI_USBCMD_RUN) || !(cmd & UHCI_USBCMD_CONFIGURE) || !(cmd & UHCI_USBCMD_EGSM)) { dev_dbg(&pdev->dev, "%s: cmd = 0x%04x\n", __func__, cmd); goto reset_needed; } intr = inw(base + UHCI_USBINTR); if (intr & (~UHCI_USBINTR_RESUME)) { dev_dbg(&pdev->dev, "%s: intr = 0x%04x\n", __func__, intr); goto reset_needed; } return 0; reset_needed: dev_dbg(&pdev->dev, "Performing full reset\n"); uhci_reset_hc(pdev, base); return 1; } EXPORT_SYMBOL_GPL(uhci_check_and_reset_hc); static inline int io_type_enabled(struct pci_dev *pdev, unsigned int mask) { u16 cmd; return !pci_read_config_word(pdev, PCI_COMMAND, &cmd) && (cmd & mask); } #define pio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_IO) #define mmio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_MEMORY) static void __devinit quirk_usb_handoff_uhci(struct pci_dev *pdev) { unsigned long base = 0; int i; if (!pio_enabled(pdev)) return; for (i = 0; i < PCI_ROM_RESOURCE; i++) if ((pci_resource_flags(pdev, i) & IORESOURCE_IO)) { base = pci_resource_start(pdev, i); break; } if (base) uhci_check_and_reset_hc(pdev, base); } static int __devinit mmio_resource_enabled(struct pci_dev *pdev, int idx) { return pci_resource_start(pdev, idx) && mmio_enabled(pdev); } static void __devinit quirk_usb_handoff_ohci(struct pci_dev *pdev) { void __iomem *base; u32 control; u32 fminterval; int cnt; if (!mmio_resource_enabled(pdev, 0)) return; base = pci_ioremap_bar(pdev, 0); if (base == NULL) return; control = readl(base + OHCI_CONTROL); /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */ #ifdef __hppa__ #define OHCI_CTRL_MASK (OHCI_CTRL_RWC | OHCI_CTRL_IR) #else #define OHCI_CTRL_MASK OHCI_CTRL_RWC if (control & OHCI_CTRL_IR) { int wait_time = 500; /* arbitrary; 5 seconds */ writel(OHCI_INTR_OC, base + OHCI_INTRENABLE); writel(OHCI_OCR, base + OHCI_CMDSTATUS); while (wait_time > 0 && readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) { wait_time -= 10; msleep(10); } if (wait_time <= 0) dev_warn(&pdev->dev, "OHCI: BIOS handoff failed" " (BIOS bug?) %08x\n", readl(base + OHCI_CONTROL)); } #endif /* disable interrupts */ writel((u32) ~0, base + OHCI_INTRDISABLE); /* Reset the USB bus, if the controller isn't already in RESET */ if (control & OHCI_HCFS) { /* Go into RESET, preserving RWC (and possibly IR) */ writel(control & OHCI_CTRL_MASK, base + OHCI_CONTROL); readl(base + OHCI_CONTROL); /* drive bus reset for at least 50 ms (7.1.7.5) */ msleep(50); } /* software reset of the controller, preserving HcFmInterval */ fminterval = readl(base + OHCI_FMINTERVAL); writel(OHCI_HCR, base + OHCI_CMDSTATUS); /* reset requires max 10 us delay */ for (cnt = 30; cnt > 0; --cnt) { /* ... allow extra time */ if ((readl(base + OHCI_CMDSTATUS) & OHCI_HCR) == 0) break; udelay(1); } writel(fminterval, base + OHCI_FMINTERVAL); /* Now the controller is safely in SUSPEND and nothing can wake it up */ iounmap(base); } static const struct dmi_system_id __devinitconst ehci_dmi_nohandoff_table[] = { { /* Pegatron Lucid (ExoPC) */ .matches = { DMI_MATCH(DMI_BOARD_NAME, "EXOPG06411"), DMI_MATCH(DMI_BIOS_VERSION, "Lucid-CE-133"), }, }, { /* Pegatron Lucid (Ordissimo AIRIS) */ .matches = { DMI_MATCH(DMI_BOARD_NAME, "M11JB"), DMI_MATCH(DMI_BIOS_VERSION, "Lucid-"), }, }, { /* Pegatron Lucid (Ordissimo) */ .matches = { DMI_MATCH(DMI_BOARD_NAME, "Ordissimo"), DMI_MATCH(DMI_BIOS_VERSION, "Lucid-"), }, }, { } }; static void __devinit ehci_bios_handoff(struct pci_dev *pdev, void __iomem *op_reg_base, u32 cap, u8 offset) { int try_handoff = 1, tried_handoff = 0; /* The Pegatron Lucid tablet sporadically waits for 98 seconds trying * the handoff on its unused controller. Skip it. */ if (pdev->vendor == 0x8086 && pdev->device == 0x283a) { if (dmi_check_system(ehci_dmi_nohandoff_table)) try_handoff = 0; } if (try_handoff && (cap & EHCI_USBLEGSUP_BIOS)) { dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n"); #if 0 /* aleksey_gorelov@phoenix.com reports that some systems need SMI forced on, * but that seems dubious in general (the BIOS left it off intentionally) * and is known to prevent some systems from booting. so we won't do this * unless maybe we can determine when we're on a system that needs SMI forced. */ /* BIOS workaround (?): be sure the pre-Linux code * receives the SMI */ pci_read_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, &val); pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, val | EHCI_USBLEGCTLSTS_SOOE); #endif /* some systems get upset if this semaphore is * set for any other reason than forcing a BIOS * handoff.. */ pci_write_config_byte(pdev, offset + 3, 1); } /* if boot firmware now owns EHCI, spin till it hands it over. */ if (try_handoff) { int msec = 1000; while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) { tried_handoff = 1; msleep(10); msec -= 10; pci_read_config_dword(pdev, offset, &cap); } } if (cap & EHCI_USBLEGSUP_BIOS) { /* well, possibly buggy BIOS... try to shut it down, * and hope nothing goes too wrong */ if (try_handoff) dev_warn(&pdev->dev, "EHCI: BIOS handoff failed" " (BIOS bug?) %08x\n", cap); pci_write_config_byte(pdev, offset + 2, 0); } /* just in case, always disable EHCI SMIs */ pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, 0); /* If the BIOS ever owned the controller then we can't expect * any power sessions to remain intact. */ if (tried_handoff) writel(0, op_reg_base + EHCI_CONFIGFLAG); } static void __devinit quirk_usb_disable_ehci(struct pci_dev *pdev) { void __iomem *base, *op_reg_base; u32 hcc_params, cap, val; u8 offset, cap_length; int wait_time, count = 256/4; if (!mmio_resource_enabled(pdev, 0)) return; base = pci_ioremap_bar(pdev, 0); if (base == NULL) return; cap_length = readb(base); op_reg_base = base + cap_length; /* EHCI 0.96 and later may have "extended capabilities" * spec section 5.1 explains the bios handoff, e.g. for * booting from USB disk or using a usb keyboard */ hcc_params = readl(base + EHCI_HCC_PARAMS); offset = (hcc_params >> 8) & 0xff; while (offset && --count) { pci_read_config_dword(pdev, offset, &cap); switch (cap & 0xff) { case 1: ehci_bios_handoff(pdev, op_reg_base, cap, offset); break; case 0: /* Illegal reserved cap, set cap=0 so we exit */ cap = 0; /* then fallthrough... */ default: dev_warn(&pdev->dev, "EHCI: unrecognized capability " "%02x\n", cap & 0xff); } offset = (cap >> 8) & 0xff; } if (!count) dev_printk(KERN_DEBUG, &pdev->dev, "EHCI: capability loop?\n"); /* * halt EHCI & disable its interrupts in any case */ val = readl(op_reg_base + EHCI_USBSTS); if ((val & EHCI_USBSTS_HALTED) == 0) { val = readl(op_reg_base + EHCI_USBCMD); val &= ~EHCI_USBCMD_RUN; writel(val, op_reg_base + EHCI_USBCMD); wait_time = 2000; do { writel(0x3f, op_reg_base + EHCI_USBSTS); udelay(100); wait_time -= 100; val = readl(op_reg_base + EHCI_USBSTS); if ((val == ~(u32)0) || (val & EHCI_USBSTS_HALTED)) { break; } } while (wait_time > 0); } writel(0, op_reg_base + EHCI_USBINTR); writel(0x3f, op_reg_base + EHCI_USBSTS); iounmap(base); } /* * handshake - spin reading a register until handshake completes * @ptr: address of hc register to be read * @mask: bits to look at in result of read * @done: value of those bits when handshake succeeds * @wait_usec: timeout in microseconds * @delay_usec: delay in microseconds to wait between polling * * Polls a register every delay_usec microseconds. * Returns 0 when the mask bits have the value done. * Returns -ETIMEDOUT if this condition is not true after * wait_usec microseconds have passed. */ static int handshake(void __iomem *ptr, u32 mask, u32 done, int wait_usec, int delay_usec) { u32 result; do { result = readl(ptr); result &= mask; if (result == done) return 0; udelay(delay_usec); wait_usec -= delay_usec; } while (wait_usec > 0); return -ETIMEDOUT; } #define PCI_DEVICE_ID_INTEL_LYNX_POINT_XHCI 0x8C31 #define PCI_DEVICE_ID_INTEL_LYNX_POINT_LP_XHCI 0x9C31 bool usb_is_intel_ppt_switchable_xhci(struct pci_dev *pdev) { return pdev->class == PCI_CLASS_SERIAL_USB_XHCI && pdev->vendor == PCI_VENDOR_ID_INTEL && pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI; } /* The Intel Lynx Point chipset also has switchable ports. */ bool usb_is_intel_lpt_switchable_xhci(struct pci_dev *pdev) { return pdev->class == PCI_CLASS_SERIAL_USB_XHCI && pdev->vendor == PCI_VENDOR_ID_INTEL && (pdev->device == PCI_DEVICE_ID_INTEL_LYNX_POINT_XHCI || pdev->device == PCI_DEVICE_ID_INTEL_LYNX_POINT_LP_XHCI); } bool usb_is_intel_switchable_xhci(struct pci_dev *pdev) { return usb_is_intel_ppt_switchable_xhci(pdev) || usb_is_intel_lpt_switchable_xhci(pdev); } EXPORT_SYMBOL_GPL(usb_is_intel_switchable_xhci); /* * Intel's Panther Point chipset has two host controllers (EHCI and xHCI) that * share some number of ports. These ports can be switched between either * controller. Not all of the ports under the EHCI host controller may be * switchable. * * The ports should be switched over to xHCI before PCI probes for any device * start. This avoids active devices under EHCI being disconnected during the * port switchover, which could cause loss of data on USB storage devices, or * failed boot when the root file system is on a USB mass storage device and is * enumerated under EHCI first. * * We write into the xHC's PCI configuration space in some Intel-specific * registers to switch the ports over. The USB 3.0 terminations and the USB * 2.0 data wires are switched separately. We want to enable the SuperSpeed * terminations before switching the USB 2.0 wires over, so that USB 3.0 * devices connect at SuperSpeed, rather than at USB 2.0 speeds. */ void usb_enable_xhci_ports(struct pci_dev *xhci_pdev) { #if defined(CONFIG_USB_XHCI_HCD) || defined(CONFIG_USB_XHCI_HCD_MODULE) u32 ports_available; /* Read USB3PRM, the USB 3.0 Port Routing Mask Register * Indicate the ports that can be changed from OS. */ pci_read_config_dword(xhci_pdev, USB_INTEL_USB3PRM, &ports_available); dev_dbg(&xhci_pdev->dev, "Configurable ports to enable SuperSpeed: 0x%x\n", ports_available); /* Write USB3_PSSEN, the USB 3.0 Port SuperSpeed Enable * Register, to turn on SuperSpeed terminations for the * switchable ports. */ pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN, cpu_to_le32(ports_available)); pci_read_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN, &ports_available); dev_dbg(&xhci_pdev->dev, "USB 3.0 ports that are now enabled " "under xHCI: 0x%x\n", ports_available); /* Read XUSB2PRM, xHCI USB 2.0 Port Routing Mask Register * Indicate the USB 2.0 ports to be controlled by the xHCI host. */ pci_read_config_dword(xhci_pdev, USB_INTEL_USB2PRM, &ports_available); dev_dbg(&xhci_pdev->dev, "Configurable USB 2.0 ports to hand over to xCHI: 0x%x\n", ports_available); /* Write XUSB2PR, the xHC USB 2.0 Port Routing Register, to * switch the USB 2.0 power and data lines over to the xHCI * host. */ pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR, cpu_to_le32(ports_available)); pci_read_config_dword(xhci_pdev, USB_INTEL_XUSB2PR, &ports_available); dev_dbg(&xhci_pdev->dev, "USB 2.0 ports that are now switched over " "to xHCI: 0x%x\n", ports_available); #else /* Don't switchover the ports if the user hasn't compiled the xHCI * driver. Otherwise they will see "dead" USB ports that don't power * the devices. */ dev_warn(&xhci_pdev->dev, "CONFIG_USB_XHCI_HCD is turned off, " "defaulting to EHCI.\n"); dev_warn(&xhci_pdev->dev, "USB 3.0 devices will work at USB 2.0 speeds.\n"); #endif /* CONFIG_USB_XHCI_HCD || CONFIG_USB_XHCI_HCD_MODULE */ } EXPORT_SYMBOL_GPL(usb_enable_xhci_ports); void usb_disable_xhci_ports(struct pci_dev *xhci_pdev) { pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN, 0x0); pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR, 0x0); } EXPORT_SYMBOL_GPL(usb_disable_xhci_ports); /** * PCI Quirks for xHCI. * * Takes care of the handoff between the Pre-OS (i.e. BIOS) and the OS. * It signals to the BIOS that the OS wants control of the host controller, * and then waits 5 seconds for the BIOS to hand over control. * If we timeout, assume the BIOS is broken and take control anyway. */ static void __devinit quirk_usb_handoff_xhci(struct pci_dev *pdev) { void __iomem *base; int ext_cap_offset; void __iomem *op_reg_base; u32 val; int timeout; int len = pci_resource_len(pdev, 0); if (!mmio_resource_enabled(pdev, 0)) return; base = ioremap_nocache(pci_resource_start(pdev, 0), len); if (base == NULL) return; /* * Find the Legacy Support Capability register - * this is optional for xHCI host controllers. */ ext_cap_offset = xhci_find_next_cap_offset(base, XHCI_HCC_PARAMS_OFFSET); do { if ((ext_cap_offset + sizeof(val)) > len) { /* We're reading garbage from the controller */ dev_warn(&pdev->dev, "xHCI controller failing to respond"); return; } if (!ext_cap_offset) /* We've reached the end of the extended capabilities */ goto hc_init; val = readl(base + ext_cap_offset); if (XHCI_EXT_CAPS_ID(val) == XHCI_EXT_CAPS_LEGACY) break; ext_cap_offset = xhci_find_next_cap_offset(base, ext_cap_offset); } while (1); /* If the BIOS owns the HC, signal that the OS wants it, and wait */ if (val & XHCI_HC_BIOS_OWNED) { writel(val | XHCI_HC_OS_OWNED, base + ext_cap_offset); /* Wait for 5 seconds with 10 microsecond polling interval */ timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED, 0, 5000, 10); /* Assume a buggy BIOS and take HC ownership anyway */ if (timeout) { dev_warn(&pdev->dev, "xHCI BIOS handoff failed" " (BIOS bug ?) %08x\n", val); writel(val & ~XHCI_HC_BIOS_OWNED, base + ext_cap_offset); } } val = readl(base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET); /* Mask off (turn off) any enabled SMIs */ val &= XHCI_LEGACY_DISABLE_SMI; /* Mask all SMI events bits, RW1C */ val |= XHCI_LEGACY_SMI_EVENTS; /* Disable any BIOS SMIs and clear all SMI events*/ writel(val, base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET); hc_init: if (usb_is_intel_switchable_xhci(pdev)) usb_enable_xhci_ports(pdev); op_reg_base = base + XHCI_HC_LENGTH(readl(base)); /* Wait for the host controller to be ready before writing any * operational or runtime registers. Wait 5 seconds and no more. */ timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_CNR, 0, 5000, 10); /* Assume a buggy HC and start HC initialization anyway */ if (timeout) { val = readl(op_reg_base + XHCI_STS_OFFSET); dev_warn(&pdev->dev, "xHCI HW not ready after 5 sec (HC bug?) " "status = 0x%x\n", val); } /* Send the halt and disable interrupts command */ val = readl(op_reg_base + XHCI_CMD_OFFSET); val &= ~(XHCI_CMD_RUN | XHCI_IRQS); writel(val, op_reg_base + XHCI_CMD_OFFSET); /* Wait for the HC to halt - poll every 125 usec (one microframe). */ timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_HALT, 1, XHCI_MAX_HALT_USEC, 125); if (timeout) { val = readl(op_reg_base + XHCI_STS_OFFSET); dev_warn(&pdev->dev, "xHCI HW did not halt within %d usec " "status = 0x%x\n", XHCI_MAX_HALT_USEC, val); } iounmap(base); } static void __devinit quirk_usb_early_handoff(struct pci_dev *pdev) { /* Skip Netlogic mips SoC's internal PCI USB controller. * This device does not need/support EHCI/OHCI handoff */ if (pdev->vendor == 0x184e) /* vendor Netlogic */ return; if (pdev->class != PCI_CLASS_SERIAL_USB_UHCI && pdev->class != PCI_CLASS_SERIAL_USB_OHCI && pdev->class != PCI_CLASS_SERIAL_USB_EHCI && pdev->class != PCI_CLASS_SERIAL_USB_XHCI) return; if (pci_enable_device(pdev) < 0) { dev_warn(&pdev->dev, "Can't enable PCI device, " "BIOS handoff failed.\n"); return; } if (pdev->class == PCI_CLASS_SERIAL_USB_UHCI) quirk_usb_handoff_uhci(pdev); else if (pdev->class == PCI_CLASS_SERIAL_USB_OHCI) quirk_usb_handoff_ohci(pdev); else if (pdev->class == PCI_CLASS_SERIAL_USB_EHCI) quirk_usb_disable_ehci(pdev); else if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI) quirk_usb_handoff_xhci(pdev); pci_disable_device(pdev); } DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, quirk_usb_early_handoff);