2 * This file contains code to reset and initialize USB host controllers.
3 * Some of it includes work-arounds for PCI hardware and BIOS quirks.
4 * It may need to run early during booting -- before USB would normally
5 * initialize -- to ensure that Linux doesn't use any legacy modes.
11 #include <linux/types.h>
12 #include <linux/kconfig.h>
13 #include <linux/kernel.h>
14 #include <linux/pci.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
17 #include <linux/export.h>
18 #include <linux/acpi.h>
19 #include <linux/dmi.h>
20 #include "pci-quirks.h"
21 #include "xhci-ext-caps.h"
24 #define UHCI_USBLEGSUP 0xc0 /* legacy support */
25 #define UHCI_USBCMD 0 /* command register */
26 #define UHCI_USBINTR 4 /* interrupt register */
27 #define UHCI_USBLEGSUP_RWC 0x8f00 /* the R/WC bits */
28 #define UHCI_USBLEGSUP_RO 0x5040 /* R/O and reserved bits */
29 #define UHCI_USBCMD_RUN 0x0001 /* RUN/STOP bit */
30 #define UHCI_USBCMD_HCRESET 0x0002 /* Host Controller reset */
31 #define UHCI_USBCMD_EGSM 0x0008 /* Global Suspend Mode */
32 #define UHCI_USBCMD_CONFIGURE 0x0040 /* Config Flag */
33 #define UHCI_USBINTR_RESUME 0x0002 /* Resume interrupt enable */
35 #define OHCI_CONTROL 0x04
36 #define OHCI_CMDSTATUS 0x08
37 #define OHCI_INTRSTATUS 0x0c
38 #define OHCI_INTRENABLE 0x10
39 #define OHCI_INTRDISABLE 0x14
40 #define OHCI_FMINTERVAL 0x34
41 #define OHCI_HCFS (3 << 6) /* hc functional state */
42 #define OHCI_HCR (1 << 0) /* host controller reset */
43 #define OHCI_OCR (1 << 3) /* ownership change request */
44 #define OHCI_CTRL_RWC (1 << 9) /* remote wakeup connected */
45 #define OHCI_CTRL_IR (1 << 8) /* interrupt routing */
46 #define OHCI_INTR_OC (1 << 30) /* ownership change */
48 #define EHCI_HCC_PARAMS 0x08 /* extended capabilities */
49 #define EHCI_USBCMD 0 /* command register */
50 #define EHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */
51 #define EHCI_USBSTS 4 /* status register */
52 #define EHCI_USBSTS_HALTED (1 << 12) /* HCHalted bit */
53 #define EHCI_USBINTR 8 /* interrupt register */
54 #define EHCI_CONFIGFLAG 0x40 /* configured flag register */
55 #define EHCI_USBLEGSUP 0 /* legacy support register */
56 #define EHCI_USBLEGSUP_BIOS (1 << 16) /* BIOS semaphore */
57 #define EHCI_USBLEGSUP_OS (1 << 24) /* OS semaphore */
58 #define EHCI_USBLEGCTLSTS 4 /* legacy control/status */
59 #define EHCI_USBLEGCTLSTS_SOOE (1 << 13) /* SMI on ownership change */
62 #define AB_REG_BAR_LOW 0xe0
63 #define AB_REG_BAR_HIGH 0xe1
64 #define AB_REG_BAR_SB700 0xf0
65 #define AB_INDX(addr) ((addr) + 0x00)
66 #define AB_DATA(addr) ((addr) + 0x04)
70 #define NB_PCIE_INDX_ADDR 0xe0
71 #define NB_PCIE_INDX_DATA 0xe4
72 #define PCIE_P_CNTL 0x10040
73 #define BIF_NB 0x10002
74 #define NB_PIF0_PWRDOWN_0 0x01100012
75 #define NB_PIF0_PWRDOWN_1 0x01100013
77 #define USB_INTEL_XUSB2PR 0xD0
78 #define USB_INTEL_USB2PRM 0xD4
79 #define USB_INTEL_USB3_PSSEN 0xD8
80 #define USB_INTEL_USB3PRM 0xDC
82 static struct amd_chipset_info {
83 struct pci_dev *nb_dev;
84 struct pci_dev *smbus_dev;
92 static DEFINE_SPINLOCK(amd_lock);
94 int usb_amd_find_chipset_info(void)
98 struct amd_chipset_info info;
101 spin_lock_irqsave(&amd_lock, flags);
103 /* probe only once */
104 if (amd_chipset.probe_count > 0) {
105 amd_chipset.probe_count++;
106 spin_unlock_irqrestore(&amd_lock, flags);
107 return amd_chipset.probe_result;
109 memset(&info, 0, sizeof(info));
110 spin_unlock_irqrestore(&amd_lock, flags);
112 info.smbus_dev = pci_get_device(PCI_VENDOR_ID_ATI, 0x4385, NULL);
113 if (info.smbus_dev) {
114 rev = info.smbus_dev->revision;
117 else if (rev >= 0x30 && rev <= 0x3b)
120 info.smbus_dev = pci_get_device(PCI_VENDOR_ID_AMD,
122 if (!info.smbus_dev) {
127 rev = info.smbus_dev->revision;
128 if (rev >= 0x11 && rev <= 0x18)
132 if (info.sb_type == 0) {
133 if (info.smbus_dev) {
134 pci_dev_put(info.smbus_dev);
135 info.smbus_dev = NULL;
141 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x9601, NULL);
145 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x1510, NULL);
149 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD,
156 ret = info.probe_result = 1;
157 printk(KERN_DEBUG "QUIRK: Enable AMD PLL fix\n");
161 spin_lock_irqsave(&amd_lock, flags);
162 if (amd_chipset.probe_count > 0) {
163 /* race - someone else was faster - drop devices */
165 /* Mark that we where here */
166 amd_chipset.probe_count++;
167 ret = amd_chipset.probe_result;
169 spin_unlock_irqrestore(&amd_lock, flags);
172 pci_dev_put(info.nb_dev);
174 pci_dev_put(info.smbus_dev);
177 /* no race - commit the result */
180 spin_unlock_irqrestore(&amd_lock, flags);
185 EXPORT_SYMBOL_GPL(usb_amd_find_chipset_info);
188 * The hardware normally enables the A-link power management feature, which
189 * lets the system lower the power consumption in idle states.
191 * This USB quirk prevents the link going into that lower power state
192 * during isochronous transfers.
194 * Without this quirk, isochronous stream on OHCI/EHCI/xHCI controllers of
195 * some AMD platforms may stutter or have breaks occasionally.
197 static void usb_amd_quirk_pll(int disable)
199 u32 addr, addr_low, addr_high, val;
200 u32 bit = disable ? 0 : 1;
203 spin_lock_irqsave(&amd_lock, flags);
206 amd_chipset.isoc_reqs++;
207 if (amd_chipset.isoc_reqs > 1) {
208 spin_unlock_irqrestore(&amd_lock, flags);
212 amd_chipset.isoc_reqs--;
213 if (amd_chipset.isoc_reqs > 0) {
214 spin_unlock_irqrestore(&amd_lock, flags);
219 if (amd_chipset.sb_type == 1 || amd_chipset.sb_type == 2) {
220 outb_p(AB_REG_BAR_LOW, 0xcd6);
221 addr_low = inb_p(0xcd7);
222 outb_p(AB_REG_BAR_HIGH, 0xcd6);
223 addr_high = inb_p(0xcd7);
224 addr = addr_high << 8 | addr_low;
226 outl_p(0x30, AB_INDX(addr));
227 outl_p(0x40, AB_DATA(addr));
228 outl_p(0x34, AB_INDX(addr));
229 val = inl_p(AB_DATA(addr));
230 } else if (amd_chipset.sb_type == 3) {
231 pci_read_config_dword(amd_chipset.smbus_dev,
232 AB_REG_BAR_SB700, &addr);
233 outl(AX_INDXC, AB_INDX(addr));
234 outl(0x40, AB_DATA(addr));
235 outl(AX_DATAC, AB_INDX(addr));
236 val = inl(AB_DATA(addr));
238 spin_unlock_irqrestore(&amd_lock, flags);
244 val |= (1 << 4) | (1 << 9);
247 val &= ~((1 << 4) | (1 << 9));
249 outl_p(val, AB_DATA(addr));
251 if (!amd_chipset.nb_dev) {
252 spin_unlock_irqrestore(&amd_lock, flags);
256 if (amd_chipset.nb_type == 1 || amd_chipset.nb_type == 3) {
258 pci_write_config_dword(amd_chipset.nb_dev,
259 NB_PCIE_INDX_ADDR, addr);
260 pci_read_config_dword(amd_chipset.nb_dev,
261 NB_PCIE_INDX_DATA, &val);
263 val &= ~(1 | (1 << 3) | (1 << 4) | (1 << 9) | (1 << 12));
264 val |= bit | (bit << 3) | (bit << 12);
265 val |= ((!bit) << 4) | ((!bit) << 9);
266 pci_write_config_dword(amd_chipset.nb_dev,
267 NB_PCIE_INDX_DATA, val);
270 pci_write_config_dword(amd_chipset.nb_dev,
271 NB_PCIE_INDX_ADDR, addr);
272 pci_read_config_dword(amd_chipset.nb_dev,
273 NB_PCIE_INDX_DATA, &val);
277 pci_write_config_dword(amd_chipset.nb_dev,
278 NB_PCIE_INDX_DATA, val);
279 } else if (amd_chipset.nb_type == 2) {
280 addr = NB_PIF0_PWRDOWN_0;
281 pci_write_config_dword(amd_chipset.nb_dev,
282 NB_PCIE_INDX_ADDR, addr);
283 pci_read_config_dword(amd_chipset.nb_dev,
284 NB_PCIE_INDX_DATA, &val);
290 pci_write_config_dword(amd_chipset.nb_dev,
291 NB_PCIE_INDX_DATA, val);
293 addr = NB_PIF0_PWRDOWN_1;
294 pci_write_config_dword(amd_chipset.nb_dev,
295 NB_PCIE_INDX_ADDR, addr);
296 pci_read_config_dword(amd_chipset.nb_dev,
297 NB_PCIE_INDX_DATA, &val);
303 pci_write_config_dword(amd_chipset.nb_dev,
304 NB_PCIE_INDX_DATA, val);
307 spin_unlock_irqrestore(&amd_lock, flags);
311 void usb_amd_quirk_pll_disable(void)
313 usb_amd_quirk_pll(1);
315 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_disable);
317 void usb_amd_quirk_pll_enable(void)
319 usb_amd_quirk_pll(0);
321 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_enable);
323 void usb_amd_dev_put(void)
325 struct pci_dev *nb, *smbus;
328 spin_lock_irqsave(&amd_lock, flags);
330 amd_chipset.probe_count--;
331 if (amd_chipset.probe_count > 0) {
332 spin_unlock_irqrestore(&amd_lock, flags);
336 /* save them to pci_dev_put outside of spinlock */
337 nb = amd_chipset.nb_dev;
338 smbus = amd_chipset.smbus_dev;
340 amd_chipset.nb_dev = NULL;
341 amd_chipset.smbus_dev = NULL;
342 amd_chipset.nb_type = 0;
343 amd_chipset.sb_type = 0;
344 amd_chipset.isoc_reqs = 0;
345 amd_chipset.probe_result = 0;
347 spin_unlock_irqrestore(&amd_lock, flags);
354 EXPORT_SYMBOL_GPL(usb_amd_dev_put);
357 * Make sure the controller is completely inactive, unable to
358 * generate interrupts or do DMA.
360 void uhci_reset_hc(struct pci_dev *pdev, unsigned long base)
362 /* Turn off PIRQ enable and SMI enable. (This also turns off the
363 * BIOS's USB Legacy Support.) Turn off all the R/WC bits too.
365 pci_write_config_word(pdev, UHCI_USBLEGSUP, UHCI_USBLEGSUP_RWC);
367 /* Reset the HC - this will force us to get a
368 * new notification of any already connected
369 * ports due to the virtual disconnect that it
372 outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD);
375 if (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET)
376 dev_warn(&pdev->dev, "HCRESET not completed yet!\n");
378 /* Just to be safe, disable interrupt requests and
379 * make sure the controller is stopped.
381 outw(0, base + UHCI_USBINTR);
382 outw(0, base + UHCI_USBCMD);
384 EXPORT_SYMBOL_GPL(uhci_reset_hc);
387 * Initialize a controller that was newly discovered or has just been
388 * resumed. In either case we can't be sure of its previous state.
390 * Returns: 1 if the controller was reset, 0 otherwise.
392 int uhci_check_and_reset_hc(struct pci_dev *pdev, unsigned long base)
395 unsigned int cmd, intr;
398 * When restarting a suspended controller, we expect all the
399 * settings to be the same as we left them:
401 * PIRQ and SMI disabled, no R/W bits set in USBLEGSUP;
402 * Controller is stopped and configured with EGSM set;
403 * No interrupts enabled except possibly Resume Detect.
405 * If any of these conditions are violated we do a complete reset.
407 pci_read_config_word(pdev, UHCI_USBLEGSUP, &legsup);
408 if (legsup & ~(UHCI_USBLEGSUP_RO | UHCI_USBLEGSUP_RWC)) {
409 dev_dbg(&pdev->dev, "%s: legsup = 0x%04x\n",
414 cmd = inw(base + UHCI_USBCMD);
415 if ((cmd & UHCI_USBCMD_RUN) || !(cmd & UHCI_USBCMD_CONFIGURE) ||
416 !(cmd & UHCI_USBCMD_EGSM)) {
417 dev_dbg(&pdev->dev, "%s: cmd = 0x%04x\n",
422 intr = inw(base + UHCI_USBINTR);
423 if (intr & (~UHCI_USBINTR_RESUME)) {
424 dev_dbg(&pdev->dev, "%s: intr = 0x%04x\n",
431 dev_dbg(&pdev->dev, "Performing full reset\n");
432 uhci_reset_hc(pdev, base);
435 EXPORT_SYMBOL_GPL(uhci_check_and_reset_hc);
437 static inline int io_type_enabled(struct pci_dev *pdev, unsigned int mask)
440 return !pci_read_config_word(pdev, PCI_COMMAND, &cmd) && (cmd & mask);
443 #define pio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_IO)
444 #define mmio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_MEMORY)
446 static void quirk_usb_handoff_uhci(struct pci_dev *pdev)
448 unsigned long base = 0;
451 if (!pio_enabled(pdev))
454 for (i = 0; i < PCI_ROM_RESOURCE; i++)
455 if ((pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
456 base = pci_resource_start(pdev, i);
461 uhci_check_and_reset_hc(pdev, base);
464 static int mmio_resource_enabled(struct pci_dev *pdev, int idx)
466 return pci_resource_start(pdev, idx) && mmio_enabled(pdev);
469 static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
476 if (!mmio_resource_enabled(pdev, 0))
479 base = pci_ioremap_bar(pdev, 0);
483 control = readl(base + OHCI_CONTROL);
485 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
487 #define OHCI_CTRL_MASK (OHCI_CTRL_RWC | OHCI_CTRL_IR)
489 #define OHCI_CTRL_MASK OHCI_CTRL_RWC
491 if (control & OHCI_CTRL_IR) {
492 int wait_time = 500; /* arbitrary; 5 seconds */
493 writel(OHCI_INTR_OC, base + OHCI_INTRENABLE);
494 writel(OHCI_OCR, base + OHCI_CMDSTATUS);
495 while (wait_time > 0 &&
496 readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
501 dev_warn(&pdev->dev, "OHCI: BIOS handoff failed"
502 " (BIOS bug?) %08x\n",
503 readl(base + OHCI_CONTROL));
507 /* disable interrupts */
508 writel((u32) ~0, base + OHCI_INTRDISABLE);
510 /* Reset the USB bus, if the controller isn't already in RESET */
511 if (control & OHCI_HCFS) {
512 /* Go into RESET, preserving RWC (and possibly IR) */
513 writel(control & OHCI_CTRL_MASK, base + OHCI_CONTROL);
514 readl(base + OHCI_CONTROL);
516 /* drive bus reset for at least 50 ms (7.1.7.5) */
520 /* software reset of the controller, preserving HcFmInterval */
521 fminterval = readl(base + OHCI_FMINTERVAL);
522 writel(OHCI_HCR, base + OHCI_CMDSTATUS);
524 /* reset requires max 10 us delay */
525 for (cnt = 30; cnt > 0; --cnt) { /* ... allow extra time */
526 if ((readl(base + OHCI_CMDSTATUS) & OHCI_HCR) == 0)
530 writel(fminterval, base + OHCI_FMINTERVAL);
532 /* Now the controller is safely in SUSPEND and nothing can wake it up */
536 static const struct dmi_system_id ehci_dmi_nohandoff_table[] = {
538 /* Pegatron Lucid (ExoPC) */
540 DMI_MATCH(DMI_BOARD_NAME, "EXOPG06411"),
541 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-CE-133"),
545 /* Pegatron Lucid (Ordissimo AIRIS) */
547 DMI_MATCH(DMI_BOARD_NAME, "M11JB"),
548 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-"),
552 /* Pegatron Lucid (Ordissimo) */
554 DMI_MATCH(DMI_BOARD_NAME, "Ordissimo"),
555 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-"),
561 static void ehci_bios_handoff(struct pci_dev *pdev,
562 void __iomem *op_reg_base,
565 int try_handoff = 1, tried_handoff = 0;
567 /* The Pegatron Lucid tablet sporadically waits for 98 seconds trying
568 * the handoff on its unused controller. Skip it. */
569 if (pdev->vendor == 0x8086 && pdev->device == 0x283a) {
570 if (dmi_check_system(ehci_dmi_nohandoff_table))
574 if (try_handoff && (cap & EHCI_USBLEGSUP_BIOS)) {
575 dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
579 * but that seems dubious in general (the BIOS left it off intentionally)
580 * and is known to prevent some systems from booting. so we won't do this
581 * unless maybe we can determine when we're on a system that needs SMI forced.
583 /* BIOS workaround (?): be sure the pre-Linux code
586 pci_read_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, &val);
587 pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS,
588 val | EHCI_USBLEGCTLSTS_SOOE);
591 /* some systems get upset if this semaphore is
592 * set for any other reason than forcing a BIOS
595 pci_write_config_byte(pdev, offset + 3, 1);
598 /* if boot firmware now owns EHCI, spin till it hands it over. */
601 while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
605 pci_read_config_dword(pdev, offset, &cap);
609 if (cap & EHCI_USBLEGSUP_BIOS) {
610 /* well, possibly buggy BIOS... try to shut it down,
611 * and hope nothing goes too wrong
614 dev_warn(&pdev->dev, "EHCI: BIOS handoff failed"
615 " (BIOS bug?) %08x\n", cap);
616 pci_write_config_byte(pdev, offset + 2, 0);
619 /* just in case, always disable EHCI SMIs */
620 pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, 0);
622 /* If the BIOS ever owned the controller then we can't expect
623 * any power sessions to remain intact.
626 writel(0, op_reg_base + EHCI_CONFIGFLAG);
629 static void quirk_usb_disable_ehci(struct pci_dev *pdev)
631 void __iomem *base, *op_reg_base;
632 u32 hcc_params, cap, val;
633 u8 offset, cap_length;
634 int wait_time, count = 256/4;
636 if (!mmio_resource_enabled(pdev, 0))
639 base = pci_ioremap_bar(pdev, 0);
643 cap_length = readb(base);
644 op_reg_base = base + cap_length;
646 /* EHCI 0.96 and later may have "extended capabilities"
647 * spec section 5.1 explains the bios handoff, e.g. for
648 * booting from USB disk or using a usb keyboard
650 hcc_params = readl(base + EHCI_HCC_PARAMS);
651 offset = (hcc_params >> 8) & 0xff;
652 while (offset && --count) {
653 pci_read_config_dword(pdev, offset, &cap);
655 switch (cap & 0xff) {
657 ehci_bios_handoff(pdev, op_reg_base, cap, offset);
659 case 0: /* Illegal reserved cap, set cap=0 so we exit */
660 cap = 0; /* then fallthrough... */
662 dev_warn(&pdev->dev, "EHCI: unrecognized capability "
663 "%02x\n", cap & 0xff);
665 offset = (cap >> 8) & 0xff;
668 dev_printk(KERN_DEBUG, &pdev->dev, "EHCI: capability loop?\n");
671 * halt EHCI & disable its interrupts in any case
673 val = readl(op_reg_base + EHCI_USBSTS);
674 if ((val & EHCI_USBSTS_HALTED) == 0) {
675 val = readl(op_reg_base + EHCI_USBCMD);
676 val &= ~EHCI_USBCMD_RUN;
677 writel(val, op_reg_base + EHCI_USBCMD);
681 writel(0x3f, op_reg_base + EHCI_USBSTS);
684 val = readl(op_reg_base + EHCI_USBSTS);
685 if ((val == ~(u32)0) || (val & EHCI_USBSTS_HALTED)) {
688 } while (wait_time > 0);
690 writel(0, op_reg_base + EHCI_USBINTR);
691 writel(0x3f, op_reg_base + EHCI_USBSTS);
697 * handshake - spin reading a register until handshake completes
698 * @ptr: address of hc register to be read
699 * @mask: bits to look at in result of read
700 * @done: value of those bits when handshake succeeds
701 * @wait_usec: timeout in microseconds
702 * @delay_usec: delay in microseconds to wait between polling
704 * Polls a register every delay_usec microseconds.
705 * Returns 0 when the mask bits have the value done.
706 * Returns -ETIMEDOUT if this condition is not true after
707 * wait_usec microseconds have passed.
709 static int handshake(void __iomem *ptr, u32 mask, u32 done,
710 int wait_usec, int delay_usec)
720 wait_usec -= delay_usec;
721 } while (wait_usec > 0);
725 #define PCI_DEVICE_ID_INTEL_LYNX_POINT_XHCI 0x8C31
726 #define PCI_DEVICE_ID_INTEL_LYNX_POINT_LP_XHCI 0x9C31
728 bool usb_is_intel_ppt_switchable_xhci(struct pci_dev *pdev)
730 return pdev->class == PCI_CLASS_SERIAL_USB_XHCI &&
731 pdev->vendor == PCI_VENDOR_ID_INTEL &&
732 pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI;
735 /* The Intel Lynx Point chipset also has switchable ports. */
736 bool usb_is_intel_lpt_switchable_xhci(struct pci_dev *pdev)
738 return pdev->class == PCI_CLASS_SERIAL_USB_XHCI &&
739 pdev->vendor == PCI_VENDOR_ID_INTEL &&
740 (pdev->device == PCI_DEVICE_ID_INTEL_LYNX_POINT_XHCI ||
741 pdev->device == PCI_DEVICE_ID_INTEL_LYNX_POINT_LP_XHCI);
744 bool usb_is_intel_switchable_xhci(struct pci_dev *pdev)
746 return usb_is_intel_ppt_switchable_xhci(pdev) ||
747 usb_is_intel_lpt_switchable_xhci(pdev);
749 EXPORT_SYMBOL_GPL(usb_is_intel_switchable_xhci);
752 * Intel's Panther Point chipset has two host controllers (EHCI and xHCI) that
753 * share some number of ports. These ports can be switched between either
754 * controller. Not all of the ports under the EHCI host controller may be
757 * The ports should be switched over to xHCI before PCI probes for any device
758 * start. This avoids active devices under EHCI being disconnected during the
759 * port switchover, which could cause loss of data on USB storage devices, or
760 * failed boot when the root file system is on a USB mass storage device and is
761 * enumerated under EHCI first.
763 * We write into the xHC's PCI configuration space in some Intel-specific
764 * registers to switch the ports over. The USB 3.0 terminations and the USB
765 * 2.0 data wires are switched separately. We want to enable the SuperSpeed
766 * terminations before switching the USB 2.0 wires over, so that USB 3.0
767 * devices connect at SuperSpeed, rather than at USB 2.0 speeds.
769 void usb_enable_xhci_ports(struct pci_dev *xhci_pdev)
773 /* Don't switchover the ports if the user hasn't compiled the xHCI
774 * driver. Otherwise they will see "dead" USB ports that don't power
777 if (!IS_ENABLED(CONFIG_USB_XHCI_HCD)) {
778 dev_warn(&xhci_pdev->dev,
779 "CONFIG_USB_XHCI_HCD is turned off, "
780 "defaulting to EHCI.\n");
781 dev_warn(&xhci_pdev->dev,
782 "USB 3.0 devices will work at USB 2.0 speeds.\n");
783 usb_disable_xhci_ports(xhci_pdev);
787 /* Read USB3PRM, the USB 3.0 Port Routing Mask Register
788 * Indicate the ports that can be changed from OS.
790 pci_read_config_dword(xhci_pdev, USB_INTEL_USB3PRM,
793 dev_dbg(&xhci_pdev->dev, "Configurable ports to enable SuperSpeed: 0x%x\n",
796 /* Write USB3_PSSEN, the USB 3.0 Port SuperSpeed Enable
797 * Register, to turn on SuperSpeed terminations for the
800 pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
801 cpu_to_le32(ports_available));
803 pci_read_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
805 dev_dbg(&xhci_pdev->dev, "USB 3.0 ports that are now enabled "
806 "under xHCI: 0x%x\n", ports_available);
808 /* Read XUSB2PRM, xHCI USB 2.0 Port Routing Mask Register
809 * Indicate the USB 2.0 ports to be controlled by the xHCI host.
812 pci_read_config_dword(xhci_pdev, USB_INTEL_USB2PRM,
815 dev_dbg(&xhci_pdev->dev, "Configurable USB 2.0 ports to hand over to xCHI: 0x%x\n",
818 /* Write XUSB2PR, the xHC USB 2.0 Port Routing Register, to
819 * switch the USB 2.0 power and data lines over to the xHCI
822 pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
823 cpu_to_le32(ports_available));
825 pci_read_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
827 dev_dbg(&xhci_pdev->dev, "USB 2.0 ports that are now switched over "
828 "to xHCI: 0x%x\n", ports_available);
830 EXPORT_SYMBOL_GPL(usb_enable_xhci_ports);
832 void usb_disable_xhci_ports(struct pci_dev *xhci_pdev)
834 pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN, 0x0);
835 pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR, 0x0);
837 EXPORT_SYMBOL_GPL(usb_disable_xhci_ports);
840 * PCI Quirks for xHCI.
842 * Takes care of the handoff between the Pre-OS (i.e. BIOS) and the OS.
843 * It signals to the BIOS that the OS wants control of the host controller,
844 * and then waits 5 seconds for the BIOS to hand over control.
845 * If we timeout, assume the BIOS is broken and take control anyway.
847 static void quirk_usb_handoff_xhci(struct pci_dev *pdev)
851 void __iomem *op_reg_base;
854 int len = pci_resource_len(pdev, 0);
856 if (!mmio_resource_enabled(pdev, 0))
859 base = ioremap_nocache(pci_resource_start(pdev, 0), len);
864 * Find the Legacy Support Capability register -
865 * this is optional for xHCI host controllers.
867 ext_cap_offset = xhci_find_next_cap_offset(base, XHCI_HCC_PARAMS_OFFSET);
869 if ((ext_cap_offset + sizeof(val)) > len) {
870 /* We're reading garbage from the controller */
872 "xHCI controller failing to respond");
877 /* We've reached the end of the extended capabilities */
880 val = readl(base + ext_cap_offset);
881 if (XHCI_EXT_CAPS_ID(val) == XHCI_EXT_CAPS_LEGACY)
883 ext_cap_offset = xhci_find_next_cap_offset(base, ext_cap_offset);
886 /* If the BIOS owns the HC, signal that the OS wants it, and wait */
887 if (val & XHCI_HC_BIOS_OWNED) {
888 writel(val | XHCI_HC_OS_OWNED, base + ext_cap_offset);
890 /* Wait for 5 seconds with 10 microsecond polling interval */
891 timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED,
894 /* Assume a buggy BIOS and take HC ownership anyway */
896 dev_warn(&pdev->dev, "xHCI BIOS handoff failed"
897 " (BIOS bug ?) %08x\n", val);
898 writel(val & ~XHCI_HC_BIOS_OWNED, base + ext_cap_offset);
902 val = readl(base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
903 /* Mask off (turn off) any enabled SMIs */
904 val &= XHCI_LEGACY_DISABLE_SMI;
905 /* Mask all SMI events bits, RW1C */
906 val |= XHCI_LEGACY_SMI_EVENTS;
907 /* Disable any BIOS SMIs and clear all SMI events*/
908 writel(val, base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
911 if (usb_is_intel_switchable_xhci(pdev))
912 usb_enable_xhci_ports(pdev);
914 op_reg_base = base + XHCI_HC_LENGTH(readl(base));
916 /* Wait for the host controller to be ready before writing any
917 * operational or runtime registers. Wait 5 seconds and no more.
919 timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_CNR, 0,
921 /* Assume a buggy HC and start HC initialization anyway */
923 val = readl(op_reg_base + XHCI_STS_OFFSET);
925 "xHCI HW not ready after 5 sec (HC bug?) "
926 "status = 0x%x\n", val);
929 /* Send the halt and disable interrupts command */
930 val = readl(op_reg_base + XHCI_CMD_OFFSET);
931 val &= ~(XHCI_CMD_RUN | XHCI_IRQS);
932 writel(val, op_reg_base + XHCI_CMD_OFFSET);
934 /* Wait for the HC to halt - poll every 125 usec (one microframe). */
935 timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_HALT, 1,
936 XHCI_MAX_HALT_USEC, 125);
938 val = readl(op_reg_base + XHCI_STS_OFFSET);
940 "xHCI HW did not halt within %d usec "
941 "status = 0x%x\n", XHCI_MAX_HALT_USEC, val);
947 static void quirk_usb_early_handoff(struct pci_dev *pdev)
949 /* Skip Netlogic mips SoC's internal PCI USB controller.
950 * This device does not need/support EHCI/OHCI handoff
952 if (pdev->vendor == 0x184e) /* vendor Netlogic */
954 if (pdev->class != PCI_CLASS_SERIAL_USB_UHCI &&
955 pdev->class != PCI_CLASS_SERIAL_USB_OHCI &&
956 pdev->class != PCI_CLASS_SERIAL_USB_EHCI &&
957 pdev->class != PCI_CLASS_SERIAL_USB_XHCI)
960 if (pci_enable_device(pdev) < 0) {
961 dev_warn(&pdev->dev, "Can't enable PCI device, "
962 "BIOS handoff failed.\n");
965 if (pdev->class == PCI_CLASS_SERIAL_USB_UHCI)
966 quirk_usb_handoff_uhci(pdev);
967 else if (pdev->class == PCI_CLASS_SERIAL_USB_OHCI)
968 quirk_usb_handoff_ohci(pdev);
969 else if (pdev->class == PCI_CLASS_SERIAL_USB_EHCI)
970 quirk_usb_disable_ehci(pdev);
971 else if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI)
972 quirk_usb_handoff_xhci(pdev);
973 pci_disable_device(pdev);
975 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
976 PCI_CLASS_SERIAL_USB, 8, quirk_usb_early_handoff);