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.
7 * Copyright (c) 1999 Martin Mares <mj@ucw.cz>
11 #include <linux/types.h>
12 #include <linux/kconfig.h>
13 #include <linux/kernel.h>
14 #include <linux/pci.h>
15 #include <linux/delay.h>
16 #include <linux/export.h>
17 #include <linux/acpi.h>
18 #include <linux/dmi.h>
19 #include "pci-quirks.h"
20 #include "xhci-ext-caps.h"
23 #define UHCI_USBLEGSUP 0xc0 /* legacy support */
24 #define UHCI_USBCMD 0 /* command register */
25 #define UHCI_USBINTR 4 /* interrupt register */
26 #define UHCI_USBLEGSUP_RWC 0x8f00 /* the R/WC bits */
27 #define UHCI_USBLEGSUP_RO 0x5040 /* R/O and reserved bits */
28 #define UHCI_USBCMD_RUN 0x0001 /* RUN/STOP bit */
29 #define UHCI_USBCMD_HCRESET 0x0002 /* Host Controller reset */
30 #define UHCI_USBCMD_EGSM 0x0008 /* Global Suspend Mode */
31 #define UHCI_USBCMD_CONFIGURE 0x0040 /* Config Flag */
32 #define UHCI_USBINTR_RESUME 0x0002 /* Resume interrupt enable */
34 #define OHCI_CONTROL 0x04
35 #define OHCI_CMDSTATUS 0x08
36 #define OHCI_INTRSTATUS 0x0c
37 #define OHCI_INTRENABLE 0x10
38 #define OHCI_INTRDISABLE 0x14
39 #define OHCI_FMINTERVAL 0x34
40 #define OHCI_HCFS (3 << 6) /* hc functional state */
41 #define OHCI_HCR (1 << 0) /* host controller reset */
42 #define OHCI_OCR (1 << 3) /* ownership change request */
43 #define OHCI_CTRL_RWC (1 << 9) /* remote wakeup connected */
44 #define OHCI_CTRL_IR (1 << 8) /* interrupt routing */
45 #define OHCI_INTR_OC (1 << 30) /* ownership change */
47 #define EHCI_HCC_PARAMS 0x08 /* extended capabilities */
48 #define EHCI_USBCMD 0 /* command register */
49 #define EHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */
50 #define EHCI_USBSTS 4 /* status register */
51 #define EHCI_USBSTS_HALTED (1 << 12) /* HCHalted bit */
52 #define EHCI_USBINTR 8 /* interrupt register */
53 #define EHCI_CONFIGFLAG 0x40 /* configured flag register */
54 #define EHCI_USBLEGSUP 0 /* legacy support register */
55 #define EHCI_USBLEGSUP_BIOS (1 << 16) /* BIOS semaphore */
56 #define EHCI_USBLEGSUP_OS (1 << 24) /* OS semaphore */
57 #define EHCI_USBLEGCTLSTS 4 /* legacy control/status */
58 #define EHCI_USBLEGCTLSTS_SOOE (1 << 13) /* SMI on ownership change */
61 #define AB_REG_BAR_LOW 0xe0
62 #define AB_REG_BAR_HIGH 0xe1
63 #define AB_REG_BAR_SB700 0xf0
64 #define AB_INDX(addr) ((addr) + 0x00)
65 #define AB_DATA(addr) ((addr) + 0x04)
69 #define NB_PCIE_INDX_ADDR 0xe0
70 #define NB_PCIE_INDX_DATA 0xe4
71 #define PCIE_P_CNTL 0x10040
72 #define BIF_NB 0x10002
73 #define NB_PIF0_PWRDOWN_0 0x01100012
74 #define NB_PIF0_PWRDOWN_1 0x01100013
76 #define USB_INTEL_XUSB2PR 0xD0
77 #define USB_INTEL_USB2PRM 0xD4
78 #define USB_INTEL_USB3_PSSEN 0xD8
79 #define USB_INTEL_USB3PRM 0xDC
82 * amd_chipset_gen values represent AMD different chipset generations
84 enum amd_chipset_gen {
96 struct amd_chipset_type {
97 enum amd_chipset_gen gen;
101 static struct amd_chipset_info {
102 struct pci_dev *nb_dev;
103 struct pci_dev *smbus_dev;
105 struct amd_chipset_type sb_type;
111 static DEFINE_SPINLOCK(amd_lock);
114 * amd_chipset_sb_type_init - initialize amd chipset southbridge type
116 * AMD FCH/SB generation and revision is identified by SMBus controller
117 * vendor, device and revision IDs.
119 * Returns: 1 if it is an AMD chipset, 0 otherwise.
121 static int amd_chipset_sb_type_init(struct amd_chipset_info *pinfo)
124 pinfo->sb_type.gen = AMD_CHIPSET_UNKNOWN;
126 pinfo->smbus_dev = pci_get_device(PCI_VENDOR_ID_ATI,
127 PCI_DEVICE_ID_ATI_SBX00_SMBUS, NULL);
128 if (pinfo->smbus_dev) {
129 rev = pinfo->smbus_dev->revision;
130 if (rev >= 0x10 && rev <= 0x1f)
131 pinfo->sb_type.gen = AMD_CHIPSET_SB600;
132 else if (rev >= 0x30 && rev <= 0x3f)
133 pinfo->sb_type.gen = AMD_CHIPSET_SB700;
134 else if (rev >= 0x40 && rev <= 0x4f)
135 pinfo->sb_type.gen = AMD_CHIPSET_SB800;
137 pinfo->smbus_dev = pci_get_device(PCI_VENDOR_ID_AMD,
138 PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, NULL);
140 if (pinfo->smbus_dev) {
141 rev = pinfo->smbus_dev->revision;
142 if (rev >= 0x11 && rev <= 0x14)
143 pinfo->sb_type.gen = AMD_CHIPSET_HUDSON2;
144 else if (rev >= 0x15 && rev <= 0x18)
145 pinfo->sb_type.gen = AMD_CHIPSET_BOLTON;
146 else if (rev >= 0x39 && rev <= 0x3a)
147 pinfo->sb_type.gen = AMD_CHIPSET_YANGTZE;
149 pinfo->smbus_dev = pci_get_device(PCI_VENDOR_ID_AMD,
151 if (pinfo->smbus_dev) {
152 rev = pinfo->smbus_dev->revision;
153 pinfo->sb_type.gen = AMD_CHIPSET_TAISHAN;
155 pinfo->sb_type.gen = NOT_AMD_CHIPSET;
160 pinfo->sb_type.rev = rev;
164 void sb800_prefetch(struct device *dev, int on)
167 struct pci_dev *pdev = to_pci_dev(dev);
169 pci_read_config_word(pdev, 0x50, &misc);
171 pci_write_config_word(pdev, 0x50, misc & 0xfcff);
173 pci_write_config_word(pdev, 0x50, misc | 0x0300);
175 EXPORT_SYMBOL_GPL(sb800_prefetch);
177 int usb_amd_find_chipset_info(void)
180 struct amd_chipset_info info;
181 int need_pll_quirk = 0;
183 spin_lock_irqsave(&amd_lock, flags);
185 /* probe only once */
186 if (amd_chipset.probe_count > 0) {
187 amd_chipset.probe_count++;
188 spin_unlock_irqrestore(&amd_lock, flags);
189 return amd_chipset.probe_result;
191 memset(&info, 0, sizeof(info));
192 spin_unlock_irqrestore(&amd_lock, flags);
194 if (!amd_chipset_sb_type_init(&info)) {
198 switch (info.sb_type.gen) {
199 case AMD_CHIPSET_SB700:
200 need_pll_quirk = info.sb_type.rev <= 0x3B;
202 case AMD_CHIPSET_SB800:
203 case AMD_CHIPSET_HUDSON2:
204 case AMD_CHIPSET_BOLTON:
212 if (!need_pll_quirk) {
213 if (info.smbus_dev) {
214 pci_dev_put(info.smbus_dev);
215 info.smbus_dev = NULL;
220 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x9601, NULL);
224 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x1510, NULL);
228 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD,
235 need_pll_quirk = info.probe_result = 1;
236 printk(KERN_DEBUG "QUIRK: Enable AMD PLL fix\n");
240 spin_lock_irqsave(&amd_lock, flags);
241 if (amd_chipset.probe_count > 0) {
242 /* race - someone else was faster - drop devices */
244 /* Mark that we where here */
245 amd_chipset.probe_count++;
246 need_pll_quirk = amd_chipset.probe_result;
248 spin_unlock_irqrestore(&amd_lock, flags);
250 pci_dev_put(info.nb_dev);
251 pci_dev_put(info.smbus_dev);
254 /* no race - commit the result */
257 spin_unlock_irqrestore(&amd_lock, flags);
260 return need_pll_quirk;
262 EXPORT_SYMBOL_GPL(usb_amd_find_chipset_info);
264 int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *pdev)
266 /* Make sure amd chipset type has already been initialized */
267 usb_amd_find_chipset_info();
268 if (amd_chipset.sb_type.gen == AMD_CHIPSET_YANGTZE ||
269 amd_chipset.sb_type.gen == AMD_CHIPSET_TAISHAN) {
270 dev_dbg(&pdev->dev, "QUIRK: Enable AMD remote wakeup fix\n");
275 EXPORT_SYMBOL_GPL(usb_hcd_amd_remote_wakeup_quirk);
277 bool usb_amd_hang_symptom_quirk(void)
281 usb_amd_find_chipset_info();
282 rev = amd_chipset.sb_type.rev;
283 /* SB600 and old version of SB700 have hang symptom bug */
284 return amd_chipset.sb_type.gen == AMD_CHIPSET_SB600 ||
285 (amd_chipset.sb_type.gen == AMD_CHIPSET_SB700 &&
286 rev >= 0x3a && rev <= 0x3b);
288 EXPORT_SYMBOL_GPL(usb_amd_hang_symptom_quirk);
290 bool usb_amd_prefetch_quirk(void)
292 usb_amd_find_chipset_info();
293 /* SB800 needs pre-fetch fix */
294 return amd_chipset.sb_type.gen == AMD_CHIPSET_SB800;
296 EXPORT_SYMBOL_GPL(usb_amd_prefetch_quirk);
299 * The hardware normally enables the A-link power management feature, which
300 * lets the system lower the power consumption in idle states.
302 * This USB quirk prevents the link going into that lower power state
303 * during isochronous transfers.
305 * Without this quirk, isochronous stream on OHCI/EHCI/xHCI controllers of
306 * some AMD platforms may stutter or have breaks occasionally.
308 static void usb_amd_quirk_pll(int disable)
310 u32 addr, addr_low, addr_high, val;
311 u32 bit = disable ? 0 : 1;
314 spin_lock_irqsave(&amd_lock, flags);
317 amd_chipset.isoc_reqs++;
318 if (amd_chipset.isoc_reqs > 1) {
319 spin_unlock_irqrestore(&amd_lock, flags);
323 amd_chipset.isoc_reqs--;
324 if (amd_chipset.isoc_reqs > 0) {
325 spin_unlock_irqrestore(&amd_lock, flags);
330 if (amd_chipset.sb_type.gen == AMD_CHIPSET_SB800 ||
331 amd_chipset.sb_type.gen == AMD_CHIPSET_HUDSON2 ||
332 amd_chipset.sb_type.gen == AMD_CHIPSET_BOLTON) {
333 outb_p(AB_REG_BAR_LOW, 0xcd6);
334 addr_low = inb_p(0xcd7);
335 outb_p(AB_REG_BAR_HIGH, 0xcd6);
336 addr_high = inb_p(0xcd7);
337 addr = addr_high << 8 | addr_low;
339 outl_p(0x30, AB_INDX(addr));
340 outl_p(0x40, AB_DATA(addr));
341 outl_p(0x34, AB_INDX(addr));
342 val = inl_p(AB_DATA(addr));
343 } else if (amd_chipset.sb_type.gen == AMD_CHIPSET_SB700 &&
344 amd_chipset.sb_type.rev <= 0x3b) {
345 pci_read_config_dword(amd_chipset.smbus_dev,
346 AB_REG_BAR_SB700, &addr);
347 outl(AX_INDXC, AB_INDX(addr));
348 outl(0x40, AB_DATA(addr));
349 outl(AX_DATAC, AB_INDX(addr));
350 val = inl(AB_DATA(addr));
352 spin_unlock_irqrestore(&amd_lock, flags);
358 val |= (1 << 4) | (1 << 9);
361 val &= ~((1 << 4) | (1 << 9));
363 outl_p(val, AB_DATA(addr));
365 if (!amd_chipset.nb_dev) {
366 spin_unlock_irqrestore(&amd_lock, flags);
370 if (amd_chipset.nb_type == 1 || amd_chipset.nb_type == 3) {
372 pci_write_config_dword(amd_chipset.nb_dev,
373 NB_PCIE_INDX_ADDR, addr);
374 pci_read_config_dword(amd_chipset.nb_dev,
375 NB_PCIE_INDX_DATA, &val);
377 val &= ~(1 | (1 << 3) | (1 << 4) | (1 << 9) | (1 << 12));
378 val |= bit | (bit << 3) | (bit << 12);
379 val |= ((!bit) << 4) | ((!bit) << 9);
380 pci_write_config_dword(amd_chipset.nb_dev,
381 NB_PCIE_INDX_DATA, val);
384 pci_write_config_dword(amd_chipset.nb_dev,
385 NB_PCIE_INDX_ADDR, addr);
386 pci_read_config_dword(amd_chipset.nb_dev,
387 NB_PCIE_INDX_DATA, &val);
391 pci_write_config_dword(amd_chipset.nb_dev,
392 NB_PCIE_INDX_DATA, val);
393 } else if (amd_chipset.nb_type == 2) {
394 addr = NB_PIF0_PWRDOWN_0;
395 pci_write_config_dword(amd_chipset.nb_dev,
396 NB_PCIE_INDX_ADDR, addr);
397 pci_read_config_dword(amd_chipset.nb_dev,
398 NB_PCIE_INDX_DATA, &val);
404 pci_write_config_dword(amd_chipset.nb_dev,
405 NB_PCIE_INDX_DATA, val);
407 addr = NB_PIF0_PWRDOWN_1;
408 pci_write_config_dword(amd_chipset.nb_dev,
409 NB_PCIE_INDX_ADDR, addr);
410 pci_read_config_dword(amd_chipset.nb_dev,
411 NB_PCIE_INDX_DATA, &val);
417 pci_write_config_dword(amd_chipset.nb_dev,
418 NB_PCIE_INDX_DATA, val);
421 spin_unlock_irqrestore(&amd_lock, flags);
425 void usb_amd_quirk_pll_disable(void)
427 usb_amd_quirk_pll(1);
429 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_disable);
431 void usb_amd_quirk_pll_enable(void)
433 usb_amd_quirk_pll(0);
435 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_enable);
437 void usb_amd_dev_put(void)
439 struct pci_dev *nb, *smbus;
442 spin_lock_irqsave(&amd_lock, flags);
444 amd_chipset.probe_count--;
445 if (amd_chipset.probe_count > 0) {
446 spin_unlock_irqrestore(&amd_lock, flags);
450 /* save them to pci_dev_put outside of spinlock */
451 nb = amd_chipset.nb_dev;
452 smbus = amd_chipset.smbus_dev;
454 amd_chipset.nb_dev = NULL;
455 amd_chipset.smbus_dev = NULL;
456 amd_chipset.nb_type = 0;
457 memset(&amd_chipset.sb_type, 0, sizeof(amd_chipset.sb_type));
458 amd_chipset.isoc_reqs = 0;
459 amd_chipset.probe_result = 0;
461 spin_unlock_irqrestore(&amd_lock, flags);
466 EXPORT_SYMBOL_GPL(usb_amd_dev_put);
469 * Make sure the controller is completely inactive, unable to
470 * generate interrupts or do DMA.
472 void uhci_reset_hc(struct pci_dev *pdev, unsigned long base)
474 /* Turn off PIRQ enable and SMI enable. (This also turns off the
475 * BIOS's USB Legacy Support.) Turn off all the R/WC bits too.
477 pci_write_config_word(pdev, UHCI_USBLEGSUP, UHCI_USBLEGSUP_RWC);
479 /* Reset the HC - this will force us to get a
480 * new notification of any already connected
481 * ports due to the virtual disconnect that it
484 outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD);
487 if (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET)
488 dev_warn(&pdev->dev, "HCRESET not completed yet!\n");
490 /* Just to be safe, disable interrupt requests and
491 * make sure the controller is stopped.
493 outw(0, base + UHCI_USBINTR);
494 outw(0, base + UHCI_USBCMD);
496 EXPORT_SYMBOL_GPL(uhci_reset_hc);
499 * Initialize a controller that was newly discovered or has just been
500 * resumed. In either case we can't be sure of its previous state.
502 * Returns: 1 if the controller was reset, 0 otherwise.
504 int uhci_check_and_reset_hc(struct pci_dev *pdev, unsigned long base)
507 unsigned int cmd, intr;
510 * When restarting a suspended controller, we expect all the
511 * settings to be the same as we left them:
513 * PIRQ and SMI disabled, no R/W bits set in USBLEGSUP;
514 * Controller is stopped and configured with EGSM set;
515 * No interrupts enabled except possibly Resume Detect.
517 * If any of these conditions are violated we do a complete reset.
519 pci_read_config_word(pdev, UHCI_USBLEGSUP, &legsup);
520 if (legsup & ~(UHCI_USBLEGSUP_RO | UHCI_USBLEGSUP_RWC)) {
521 dev_dbg(&pdev->dev, "%s: legsup = 0x%04x\n",
526 cmd = inw(base + UHCI_USBCMD);
527 if ((cmd & UHCI_USBCMD_RUN) || !(cmd & UHCI_USBCMD_CONFIGURE) ||
528 !(cmd & UHCI_USBCMD_EGSM)) {
529 dev_dbg(&pdev->dev, "%s: cmd = 0x%04x\n",
534 intr = inw(base + UHCI_USBINTR);
535 if (intr & (~UHCI_USBINTR_RESUME)) {
536 dev_dbg(&pdev->dev, "%s: intr = 0x%04x\n",
543 dev_dbg(&pdev->dev, "Performing full reset\n");
544 uhci_reset_hc(pdev, base);
547 EXPORT_SYMBOL_GPL(uhci_check_and_reset_hc);
549 static inline int io_type_enabled(struct pci_dev *pdev, unsigned int mask)
552 return !pci_read_config_word(pdev, PCI_COMMAND, &cmd) && (cmd & mask);
555 #define pio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_IO)
556 #define mmio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_MEMORY)
558 static void quirk_usb_handoff_uhci(struct pci_dev *pdev)
560 unsigned long base = 0;
563 if (!pio_enabled(pdev))
566 for (i = 0; i < PCI_ROM_RESOURCE; i++)
567 if ((pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
568 base = pci_resource_start(pdev, i);
573 uhci_check_and_reset_hc(pdev, base);
576 static int mmio_resource_enabled(struct pci_dev *pdev, int idx)
578 return pci_resource_start(pdev, idx) && mmio_enabled(pdev);
581 static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
586 bool no_fminterval = false;
589 if (!mmio_resource_enabled(pdev, 0))
592 base = pci_ioremap_bar(pdev, 0);
597 * ULi M5237 OHCI controller locks the whole system when accessing
598 * the OHCI_FMINTERVAL offset.
600 if (pdev->vendor == PCI_VENDOR_ID_AL && pdev->device == 0x5237)
601 no_fminterval = true;
603 control = readl(base + OHCI_CONTROL);
605 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
607 #define OHCI_CTRL_MASK (OHCI_CTRL_RWC | OHCI_CTRL_IR)
609 #define OHCI_CTRL_MASK OHCI_CTRL_RWC
611 if (control & OHCI_CTRL_IR) {
612 int wait_time = 500; /* arbitrary; 5 seconds */
613 writel(OHCI_INTR_OC, base + OHCI_INTRENABLE);
614 writel(OHCI_OCR, base + OHCI_CMDSTATUS);
615 while (wait_time > 0 &&
616 readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
622 "OHCI: BIOS handoff failed (BIOS bug?) %08x\n",
623 readl(base + OHCI_CONTROL));
627 /* disable interrupts */
628 writel((u32) ~0, base + OHCI_INTRDISABLE);
630 /* Reset the USB bus, if the controller isn't already in RESET */
631 if (control & OHCI_HCFS) {
632 /* Go into RESET, preserving RWC (and possibly IR) */
633 writel(control & OHCI_CTRL_MASK, base + OHCI_CONTROL);
634 readl(base + OHCI_CONTROL);
636 /* drive bus reset for at least 50 ms (7.1.7.5) */
640 /* software reset of the controller, preserving HcFmInterval */
642 fminterval = readl(base + OHCI_FMINTERVAL);
644 writel(OHCI_HCR, base + OHCI_CMDSTATUS);
646 /* reset requires max 10 us delay */
647 for (cnt = 30; cnt > 0; --cnt) { /* ... allow extra time */
648 if ((readl(base + OHCI_CMDSTATUS) & OHCI_HCR) == 0)
654 writel(fminterval, base + OHCI_FMINTERVAL);
656 /* Now the controller is safely in SUSPEND and nothing can wake it up */
660 static const struct dmi_system_id ehci_dmi_nohandoff_table[] = {
662 /* Pegatron Lucid (ExoPC) */
664 DMI_MATCH(DMI_BOARD_NAME, "EXOPG06411"),
665 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-CE-133"),
669 /* Pegatron Lucid (Ordissimo AIRIS) */
671 DMI_MATCH(DMI_BOARD_NAME, "M11JB"),
672 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-"),
676 /* Pegatron Lucid (Ordissimo) */
678 DMI_MATCH(DMI_BOARD_NAME, "Ordissimo"),
679 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-"),
685 DMI_MATCH(DMI_BOARD_VENDOR, "HASEE"),
686 DMI_MATCH(DMI_BOARD_NAME, "E210"),
687 DMI_MATCH(DMI_BIOS_VERSION, "6.00"),
693 static void ehci_bios_handoff(struct pci_dev *pdev,
694 void __iomem *op_reg_base,
697 int try_handoff = 1, tried_handoff = 0;
700 * The Pegatron Lucid tablet sporadically waits for 98 seconds trying
701 * the handoff on its unused controller. Skip it.
703 * The HASEE E200 hangs when the semaphore is set (bugzilla #77021).
705 if (pdev->vendor == 0x8086 && (pdev->device == 0x283a ||
706 pdev->device == 0x27cc)) {
707 if (dmi_check_system(ehci_dmi_nohandoff_table))
711 if (try_handoff && (cap & EHCI_USBLEGSUP_BIOS)) {
712 dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
715 /* aleksey_gorelov@phoenix.com reports that some systems need SMI forced on,
716 * but that seems dubious in general (the BIOS left it off intentionally)
717 * and is known to prevent some systems from booting. so we won't do this
718 * unless maybe we can determine when we're on a system that needs SMI forced.
720 /* BIOS workaround (?): be sure the pre-Linux code
723 pci_read_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, &val);
724 pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS,
725 val | EHCI_USBLEGCTLSTS_SOOE);
728 /* some systems get upset if this semaphore is
729 * set for any other reason than forcing a BIOS
732 pci_write_config_byte(pdev, offset + 3, 1);
735 /* if boot firmware now owns EHCI, spin till it hands it over. */
738 while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
742 pci_read_config_dword(pdev, offset, &cap);
746 if (cap & EHCI_USBLEGSUP_BIOS) {
747 /* well, possibly buggy BIOS... try to shut it down,
748 * and hope nothing goes too wrong
752 "EHCI: BIOS handoff failed (BIOS bug?) %08x\n",
754 pci_write_config_byte(pdev, offset + 2, 0);
757 /* just in case, always disable EHCI SMIs */
758 pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, 0);
760 /* If the BIOS ever owned the controller then we can't expect
761 * any power sessions to remain intact.
764 writel(0, op_reg_base + EHCI_CONFIGFLAG);
767 static void quirk_usb_disable_ehci(struct pci_dev *pdev)
769 void __iomem *base, *op_reg_base;
770 u32 hcc_params, cap, val;
771 u8 offset, cap_length;
772 int wait_time, count = 256/4;
774 if (!mmio_resource_enabled(pdev, 0))
777 base = pci_ioremap_bar(pdev, 0);
781 cap_length = readb(base);
782 op_reg_base = base + cap_length;
784 /* EHCI 0.96 and later may have "extended capabilities"
785 * spec section 5.1 explains the bios handoff, e.g. for
786 * booting from USB disk or using a usb keyboard
788 hcc_params = readl(base + EHCI_HCC_PARAMS);
789 offset = (hcc_params >> 8) & 0xff;
790 while (offset && --count) {
791 pci_read_config_dword(pdev, offset, &cap);
793 switch (cap & 0xff) {
795 ehci_bios_handoff(pdev, op_reg_base, cap, offset);
797 case 0: /* Illegal reserved cap, set cap=0 so we exit */
798 cap = 0; /* then fallthrough... */
801 "EHCI: unrecognized capability %02x\n",
804 offset = (cap >> 8) & 0xff;
807 dev_printk(KERN_DEBUG, &pdev->dev, "EHCI: capability loop?\n");
810 * halt EHCI & disable its interrupts in any case
812 val = readl(op_reg_base + EHCI_USBSTS);
813 if ((val & EHCI_USBSTS_HALTED) == 0) {
814 val = readl(op_reg_base + EHCI_USBCMD);
815 val &= ~EHCI_USBCMD_RUN;
816 writel(val, op_reg_base + EHCI_USBCMD);
820 writel(0x3f, op_reg_base + EHCI_USBSTS);
823 val = readl(op_reg_base + EHCI_USBSTS);
824 if ((val == ~(u32)0) || (val & EHCI_USBSTS_HALTED)) {
827 } while (wait_time > 0);
829 writel(0, op_reg_base + EHCI_USBINTR);
830 writel(0x3f, op_reg_base + EHCI_USBSTS);
836 * handshake - spin reading a register until handshake completes
837 * @ptr: address of hc register to be read
838 * @mask: bits to look at in result of read
839 * @done: value of those bits when handshake succeeds
840 * @wait_usec: timeout in microseconds
841 * @delay_usec: delay in microseconds to wait between polling
843 * Polls a register every delay_usec microseconds.
844 * Returns 0 when the mask bits have the value done.
845 * Returns -ETIMEDOUT if this condition is not true after
846 * wait_usec microseconds have passed.
848 static int handshake(void __iomem *ptr, u32 mask, u32 done,
849 int wait_usec, int delay_usec)
859 wait_usec -= delay_usec;
860 } while (wait_usec > 0);
865 * Intel's Panther Point chipset has two host controllers (EHCI and xHCI) that
866 * share some number of ports. These ports can be switched between either
867 * controller. Not all of the ports under the EHCI host controller may be
870 * The ports should be switched over to xHCI before PCI probes for any device
871 * start. This avoids active devices under EHCI being disconnected during the
872 * port switchover, which could cause loss of data on USB storage devices, or
873 * failed boot when the root file system is on a USB mass storage device and is
874 * enumerated under EHCI first.
876 * We write into the xHC's PCI configuration space in some Intel-specific
877 * registers to switch the ports over. The USB 3.0 terminations and the USB
878 * 2.0 data wires are switched separately. We want to enable the SuperSpeed
879 * terminations before switching the USB 2.0 wires over, so that USB 3.0
880 * devices connect at SuperSpeed, rather than at USB 2.0 speeds.
882 void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev)
885 bool ehci_found = false;
886 struct pci_dev *companion = NULL;
888 /* Sony VAIO t-series with subsystem device ID 90a8 is not capable of
889 * switching ports from EHCI to xHCI
891 if (xhci_pdev->subsystem_vendor == PCI_VENDOR_ID_SONY &&
892 xhci_pdev->subsystem_device == 0x90a8)
895 /* make sure an intel EHCI controller exists */
896 for_each_pci_dev(companion) {
897 if (companion->class == PCI_CLASS_SERIAL_USB_EHCI &&
898 companion->vendor == PCI_VENDOR_ID_INTEL) {
907 /* Don't switchover the ports if the user hasn't compiled the xHCI
908 * driver. Otherwise they will see "dead" USB ports that don't power
911 if (!IS_ENABLED(CONFIG_USB_XHCI_HCD)) {
912 dev_warn(&xhci_pdev->dev,
913 "CONFIG_USB_XHCI_HCD is turned off, defaulting to EHCI.\n");
914 dev_warn(&xhci_pdev->dev,
915 "USB 3.0 devices will work at USB 2.0 speeds.\n");
916 usb_disable_xhci_ports(xhci_pdev);
920 /* Read USB3PRM, the USB 3.0 Port Routing Mask Register
921 * Indicate the ports that can be changed from OS.
923 pci_read_config_dword(xhci_pdev, USB_INTEL_USB3PRM,
926 dev_dbg(&xhci_pdev->dev, "Configurable ports to enable SuperSpeed: 0x%x\n",
929 /* Write USB3_PSSEN, the USB 3.0 Port SuperSpeed Enable
930 * Register, to turn on SuperSpeed terminations for the
933 pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
936 pci_read_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
938 dev_dbg(&xhci_pdev->dev,
939 "USB 3.0 ports that are now enabled under xHCI: 0x%x\n",
942 /* Read XUSB2PRM, xHCI USB 2.0 Port Routing Mask Register
943 * Indicate the USB 2.0 ports to be controlled by the xHCI host.
946 pci_read_config_dword(xhci_pdev, USB_INTEL_USB2PRM,
949 dev_dbg(&xhci_pdev->dev, "Configurable USB 2.0 ports to hand over to xCHI: 0x%x\n",
952 /* Write XUSB2PR, the xHC USB 2.0 Port Routing Register, to
953 * switch the USB 2.0 power and data lines over to the xHCI
956 pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
959 pci_read_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
961 dev_dbg(&xhci_pdev->dev,
962 "USB 2.0 ports that are now switched over to xHCI: 0x%x\n",
965 EXPORT_SYMBOL_GPL(usb_enable_intel_xhci_ports);
967 void usb_disable_xhci_ports(struct pci_dev *xhci_pdev)
969 pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN, 0x0);
970 pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR, 0x0);
972 EXPORT_SYMBOL_GPL(usb_disable_xhci_ports);
975 * PCI Quirks for xHCI.
977 * Takes care of the handoff between the Pre-OS (i.e. BIOS) and the OS.
978 * It signals to the BIOS that the OS wants control of the host controller,
979 * and then waits 1 second for the BIOS to hand over control.
980 * If we timeout, assume the BIOS is broken and take control anyway.
982 static void quirk_usb_handoff_xhci(struct pci_dev *pdev)
986 void __iomem *op_reg_base;
989 int len = pci_resource_len(pdev, 0);
991 if (!mmio_resource_enabled(pdev, 0))
994 base = ioremap_nocache(pci_resource_start(pdev, 0), len);
999 * Find the Legacy Support Capability register -
1000 * this is optional for xHCI host controllers.
1002 ext_cap_offset = xhci_find_next_cap_offset(base, XHCI_HCC_PARAMS_OFFSET);
1004 if ((ext_cap_offset + sizeof(val)) > len) {
1005 /* We're reading garbage from the controller */
1006 dev_warn(&pdev->dev,
1007 "xHCI controller failing to respond");
1011 if (!ext_cap_offset)
1012 /* We've reached the end of the extended capabilities */
1015 val = readl(base + ext_cap_offset);
1016 if (XHCI_EXT_CAPS_ID(val) == XHCI_EXT_CAPS_LEGACY)
1018 ext_cap_offset = xhci_find_next_cap_offset(base, ext_cap_offset);
1021 /* If the BIOS owns the HC, signal that the OS wants it, and wait */
1022 if (val & XHCI_HC_BIOS_OWNED) {
1023 writel(val | XHCI_HC_OS_OWNED, base + ext_cap_offset);
1025 /* Wait for 1 second with 10 microsecond polling interval */
1026 timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED,
1029 /* Assume a buggy BIOS and take HC ownership anyway */
1031 dev_warn(&pdev->dev,
1032 "xHCI BIOS handoff failed (BIOS bug ?) %08x\n",
1034 writel(val & ~XHCI_HC_BIOS_OWNED, base + ext_cap_offset);
1038 val = readl(base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
1039 /* Mask off (turn off) any enabled SMIs */
1040 val &= XHCI_LEGACY_DISABLE_SMI;
1041 /* Mask all SMI events bits, RW1C */
1042 val |= XHCI_LEGACY_SMI_EVENTS;
1043 /* Disable any BIOS SMIs and clear all SMI events*/
1044 writel(val, base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
1047 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
1048 usb_enable_intel_xhci_ports(pdev);
1050 op_reg_base = base + XHCI_HC_LENGTH(readl(base));
1052 /* Wait for the host controller to be ready before writing any
1053 * operational or runtime registers. Wait 5 seconds and no more.
1055 timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_CNR, 0,
1057 /* Assume a buggy HC and start HC initialization anyway */
1059 val = readl(op_reg_base + XHCI_STS_OFFSET);
1060 dev_warn(&pdev->dev,
1061 "xHCI HW not ready after 5 sec (HC bug?) status = 0x%x\n",
1065 /* Send the halt and disable interrupts command */
1066 val = readl(op_reg_base + XHCI_CMD_OFFSET);
1067 val &= ~(XHCI_CMD_RUN | XHCI_IRQS);
1068 writel(val, op_reg_base + XHCI_CMD_OFFSET);
1070 /* Wait for the HC to halt - poll every 125 usec (one microframe). */
1071 timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_HALT, 1,
1072 XHCI_MAX_HALT_USEC, 125);
1074 val = readl(op_reg_base + XHCI_STS_OFFSET);
1075 dev_warn(&pdev->dev,
1076 "xHCI HW did not halt within %d usec status = 0x%x\n",
1077 XHCI_MAX_HALT_USEC, val);
1083 static void quirk_usb_early_handoff(struct pci_dev *pdev)
1085 /* Skip Netlogic mips SoC's internal PCI USB controller.
1086 * This device does not need/support EHCI/OHCI handoff
1088 if (pdev->vendor == 0x184e) /* vendor Netlogic */
1090 if (pdev->class != PCI_CLASS_SERIAL_USB_UHCI &&
1091 pdev->class != PCI_CLASS_SERIAL_USB_OHCI &&
1092 pdev->class != PCI_CLASS_SERIAL_USB_EHCI &&
1093 pdev->class != PCI_CLASS_SERIAL_USB_XHCI)
1096 if (pci_enable_device(pdev) < 0) {
1097 dev_warn(&pdev->dev,
1098 "Can't enable PCI device, BIOS handoff failed.\n");
1101 if (pdev->class == PCI_CLASS_SERIAL_USB_UHCI)
1102 quirk_usb_handoff_uhci(pdev);
1103 else if (pdev->class == PCI_CLASS_SERIAL_USB_OHCI)
1104 quirk_usb_handoff_ohci(pdev);
1105 else if (pdev->class == PCI_CLASS_SERIAL_USB_EHCI)
1106 quirk_usb_disable_ehci(pdev);
1107 else if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI)
1108 quirk_usb_handoff_xhci(pdev);
1109 pci_disable_device(pdev);
1111 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
1112 PCI_CLASS_SERIAL_USB, 8, quirk_usb_early_handoff);