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/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 {
95 struct amd_chipset_type {
96 enum amd_chipset_gen gen;
100 static struct amd_chipset_info {
101 struct pci_dev *nb_dev;
102 struct pci_dev *smbus_dev;
104 struct amd_chipset_type sb_type;
110 static DEFINE_SPINLOCK(amd_lock);
113 * amd_chipset_sb_type_init - initialize amd chipset southbridge type
115 * AMD FCH/SB generation and revision is identified by SMBus controller
116 * vendor, device and revision IDs.
118 * Returns: 1 if it is an AMD chipset, 0 otherwise.
120 static int amd_chipset_sb_type_init(struct amd_chipset_info *pinfo)
123 pinfo->sb_type.gen = AMD_CHIPSET_UNKNOWN;
125 pinfo->smbus_dev = pci_get_device(PCI_VENDOR_ID_ATI,
126 PCI_DEVICE_ID_ATI_SBX00_SMBUS, NULL);
127 if (pinfo->smbus_dev) {
128 rev = pinfo->smbus_dev->revision;
129 if (rev >= 0x10 && rev <= 0x1f)
130 pinfo->sb_type.gen = AMD_CHIPSET_SB600;
131 else if (rev >= 0x30 && rev <= 0x3f)
132 pinfo->sb_type.gen = AMD_CHIPSET_SB700;
133 else if (rev >= 0x40 && rev <= 0x4f)
134 pinfo->sb_type.gen = AMD_CHIPSET_SB800;
136 pinfo->smbus_dev = pci_get_device(PCI_VENDOR_ID_AMD,
137 PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, NULL);
139 if (!pinfo->smbus_dev) {
140 pinfo->sb_type.gen = NOT_AMD_CHIPSET;
144 rev = pinfo->smbus_dev->revision;
145 if (rev >= 0x11 && rev <= 0x14)
146 pinfo->sb_type.gen = AMD_CHIPSET_HUDSON2;
147 else if (rev >= 0x15 && rev <= 0x18)
148 pinfo->sb_type.gen = AMD_CHIPSET_BOLTON;
149 else if (rev >= 0x39 && rev <= 0x3a)
150 pinfo->sb_type.gen = AMD_CHIPSET_YANGTZE;
153 pinfo->sb_type.rev = rev;
157 void sb800_prefetch(struct device *dev, int on)
160 struct pci_dev *pdev = to_pci_dev(dev);
162 pci_read_config_word(pdev, 0x50, &misc);
164 pci_write_config_word(pdev, 0x50, misc & 0xfcff);
166 pci_write_config_word(pdev, 0x50, misc | 0x0300);
168 EXPORT_SYMBOL_GPL(sb800_prefetch);
170 int usb_amd_find_chipset_info(void)
173 struct amd_chipset_info info;
176 spin_lock_irqsave(&amd_lock, flags);
178 /* probe only once */
179 if (amd_chipset.probe_count > 0) {
180 amd_chipset.probe_count++;
181 spin_unlock_irqrestore(&amd_lock, flags);
182 return amd_chipset.probe_result;
184 memset(&info, 0, sizeof(info));
185 spin_unlock_irqrestore(&amd_lock, flags);
187 if (!amd_chipset_sb_type_init(&info)) {
192 /* Below chipset generations needn't enable AMD PLL quirk */
193 if (info.sb_type.gen == AMD_CHIPSET_UNKNOWN ||
194 info.sb_type.gen == AMD_CHIPSET_SB600 ||
195 info.sb_type.gen == AMD_CHIPSET_YANGTZE ||
196 (info.sb_type.gen == AMD_CHIPSET_SB700 &&
197 info.sb_type.rev > 0x3b)) {
198 if (info.smbus_dev) {
199 pci_dev_put(info.smbus_dev);
200 info.smbus_dev = NULL;
206 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x9601, NULL);
210 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x1510, NULL);
214 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD,
221 ret = info.probe_result = 1;
222 printk(KERN_DEBUG "QUIRK: Enable AMD PLL fix\n");
226 spin_lock_irqsave(&amd_lock, flags);
227 if (amd_chipset.probe_count > 0) {
228 /* race - someone else was faster - drop devices */
230 /* Mark that we where here */
231 amd_chipset.probe_count++;
232 ret = amd_chipset.probe_result;
234 spin_unlock_irqrestore(&amd_lock, flags);
236 pci_dev_put(info.nb_dev);
237 pci_dev_put(info.smbus_dev);
240 /* no race - commit the result */
243 spin_unlock_irqrestore(&amd_lock, flags);
248 EXPORT_SYMBOL_GPL(usb_amd_find_chipset_info);
250 int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *pdev)
252 /* Make sure amd chipset type has already been initialized */
253 usb_amd_find_chipset_info();
254 if (amd_chipset.sb_type.gen != AMD_CHIPSET_YANGTZE)
257 dev_dbg(&pdev->dev, "QUIRK: Enable AMD remote wakeup fix\n");
260 EXPORT_SYMBOL_GPL(usb_hcd_amd_remote_wakeup_quirk);
262 bool usb_amd_hang_symptom_quirk(void)
266 usb_amd_find_chipset_info();
267 rev = amd_chipset.sb_type.rev;
268 /* SB600 and old version of SB700 have hang symptom bug */
269 return amd_chipset.sb_type.gen == AMD_CHIPSET_SB600 ||
270 (amd_chipset.sb_type.gen == AMD_CHIPSET_SB700 &&
271 rev >= 0x3a && rev <= 0x3b);
273 EXPORT_SYMBOL_GPL(usb_amd_hang_symptom_quirk);
275 bool usb_amd_prefetch_quirk(void)
277 usb_amd_find_chipset_info();
278 /* SB800 needs pre-fetch fix */
279 return amd_chipset.sb_type.gen == AMD_CHIPSET_SB800;
281 EXPORT_SYMBOL_GPL(usb_amd_prefetch_quirk);
284 * The hardware normally enables the A-link power management feature, which
285 * lets the system lower the power consumption in idle states.
287 * This USB quirk prevents the link going into that lower power state
288 * during isochronous transfers.
290 * Without this quirk, isochronous stream on OHCI/EHCI/xHCI controllers of
291 * some AMD platforms may stutter or have breaks occasionally.
293 static void usb_amd_quirk_pll(int disable)
295 u32 addr, addr_low, addr_high, val;
296 u32 bit = disable ? 0 : 1;
299 spin_lock_irqsave(&amd_lock, flags);
302 amd_chipset.isoc_reqs++;
303 if (amd_chipset.isoc_reqs > 1) {
304 spin_unlock_irqrestore(&amd_lock, flags);
308 amd_chipset.isoc_reqs--;
309 if (amd_chipset.isoc_reqs > 0) {
310 spin_unlock_irqrestore(&amd_lock, flags);
315 if (amd_chipset.sb_type.gen == AMD_CHIPSET_SB800 ||
316 amd_chipset.sb_type.gen == AMD_CHIPSET_HUDSON2 ||
317 amd_chipset.sb_type.gen == AMD_CHIPSET_BOLTON) {
318 outb_p(AB_REG_BAR_LOW, 0xcd6);
319 addr_low = inb_p(0xcd7);
320 outb_p(AB_REG_BAR_HIGH, 0xcd6);
321 addr_high = inb_p(0xcd7);
322 addr = addr_high << 8 | addr_low;
324 outl_p(0x30, AB_INDX(addr));
325 outl_p(0x40, AB_DATA(addr));
326 outl_p(0x34, AB_INDX(addr));
327 val = inl_p(AB_DATA(addr));
328 } else if (amd_chipset.sb_type.gen == AMD_CHIPSET_SB700 &&
329 amd_chipset.sb_type.rev <= 0x3b) {
330 pci_read_config_dword(amd_chipset.smbus_dev,
331 AB_REG_BAR_SB700, &addr);
332 outl(AX_INDXC, AB_INDX(addr));
333 outl(0x40, AB_DATA(addr));
334 outl(AX_DATAC, AB_INDX(addr));
335 val = inl(AB_DATA(addr));
337 spin_unlock_irqrestore(&amd_lock, flags);
343 val |= (1 << 4) | (1 << 9);
346 val &= ~((1 << 4) | (1 << 9));
348 outl_p(val, AB_DATA(addr));
350 if (!amd_chipset.nb_dev) {
351 spin_unlock_irqrestore(&amd_lock, flags);
355 if (amd_chipset.nb_type == 1 || amd_chipset.nb_type == 3) {
357 pci_write_config_dword(amd_chipset.nb_dev,
358 NB_PCIE_INDX_ADDR, addr);
359 pci_read_config_dword(amd_chipset.nb_dev,
360 NB_PCIE_INDX_DATA, &val);
362 val &= ~(1 | (1 << 3) | (1 << 4) | (1 << 9) | (1 << 12));
363 val |= bit | (bit << 3) | (bit << 12);
364 val |= ((!bit) << 4) | ((!bit) << 9);
365 pci_write_config_dword(amd_chipset.nb_dev,
366 NB_PCIE_INDX_DATA, val);
369 pci_write_config_dword(amd_chipset.nb_dev,
370 NB_PCIE_INDX_ADDR, addr);
371 pci_read_config_dword(amd_chipset.nb_dev,
372 NB_PCIE_INDX_DATA, &val);
376 pci_write_config_dword(amd_chipset.nb_dev,
377 NB_PCIE_INDX_DATA, val);
378 } else if (amd_chipset.nb_type == 2) {
379 addr = NB_PIF0_PWRDOWN_0;
380 pci_write_config_dword(amd_chipset.nb_dev,
381 NB_PCIE_INDX_ADDR, addr);
382 pci_read_config_dword(amd_chipset.nb_dev,
383 NB_PCIE_INDX_DATA, &val);
389 pci_write_config_dword(amd_chipset.nb_dev,
390 NB_PCIE_INDX_DATA, val);
392 addr = NB_PIF0_PWRDOWN_1;
393 pci_write_config_dword(amd_chipset.nb_dev,
394 NB_PCIE_INDX_ADDR, addr);
395 pci_read_config_dword(amd_chipset.nb_dev,
396 NB_PCIE_INDX_DATA, &val);
402 pci_write_config_dword(amd_chipset.nb_dev,
403 NB_PCIE_INDX_DATA, val);
406 spin_unlock_irqrestore(&amd_lock, flags);
410 void usb_amd_quirk_pll_disable(void)
412 usb_amd_quirk_pll(1);
414 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_disable);
416 void usb_amd_quirk_pll_enable(void)
418 usb_amd_quirk_pll(0);
420 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_enable);
422 void usb_amd_dev_put(void)
424 struct pci_dev *nb, *smbus;
427 spin_lock_irqsave(&amd_lock, flags);
429 amd_chipset.probe_count--;
430 if (amd_chipset.probe_count > 0) {
431 spin_unlock_irqrestore(&amd_lock, flags);
435 /* save them to pci_dev_put outside of spinlock */
436 nb = amd_chipset.nb_dev;
437 smbus = amd_chipset.smbus_dev;
439 amd_chipset.nb_dev = NULL;
440 amd_chipset.smbus_dev = NULL;
441 amd_chipset.nb_type = 0;
442 memset(&amd_chipset.sb_type, 0, sizeof(amd_chipset.sb_type));
443 amd_chipset.isoc_reqs = 0;
444 amd_chipset.probe_result = 0;
446 spin_unlock_irqrestore(&amd_lock, flags);
451 EXPORT_SYMBOL_GPL(usb_amd_dev_put);
454 * Make sure the controller is completely inactive, unable to
455 * generate interrupts or do DMA.
457 void uhci_reset_hc(struct pci_dev *pdev, unsigned long base)
459 /* Turn off PIRQ enable and SMI enable. (This also turns off the
460 * BIOS's USB Legacy Support.) Turn off all the R/WC bits too.
462 pci_write_config_word(pdev, UHCI_USBLEGSUP, UHCI_USBLEGSUP_RWC);
464 /* Reset the HC - this will force us to get a
465 * new notification of any already connected
466 * ports due to the virtual disconnect that it
469 outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD);
472 if (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET)
473 dev_warn(&pdev->dev, "HCRESET not completed yet!\n");
475 /* Just to be safe, disable interrupt requests and
476 * make sure the controller is stopped.
478 outw(0, base + UHCI_USBINTR);
479 outw(0, base + UHCI_USBCMD);
481 EXPORT_SYMBOL_GPL(uhci_reset_hc);
484 * Initialize a controller that was newly discovered or has just been
485 * resumed. In either case we can't be sure of its previous state.
487 * Returns: 1 if the controller was reset, 0 otherwise.
489 int uhci_check_and_reset_hc(struct pci_dev *pdev, unsigned long base)
492 unsigned int cmd, intr;
495 * When restarting a suspended controller, we expect all the
496 * settings to be the same as we left them:
498 * PIRQ and SMI disabled, no R/W bits set in USBLEGSUP;
499 * Controller is stopped and configured with EGSM set;
500 * No interrupts enabled except possibly Resume Detect.
502 * If any of these conditions are violated we do a complete reset.
504 pci_read_config_word(pdev, UHCI_USBLEGSUP, &legsup);
505 if (legsup & ~(UHCI_USBLEGSUP_RO | UHCI_USBLEGSUP_RWC)) {
506 dev_dbg(&pdev->dev, "%s: legsup = 0x%04x\n",
511 cmd = inw(base + UHCI_USBCMD);
512 if ((cmd & UHCI_USBCMD_RUN) || !(cmd & UHCI_USBCMD_CONFIGURE) ||
513 !(cmd & UHCI_USBCMD_EGSM)) {
514 dev_dbg(&pdev->dev, "%s: cmd = 0x%04x\n",
519 intr = inw(base + UHCI_USBINTR);
520 if (intr & (~UHCI_USBINTR_RESUME)) {
521 dev_dbg(&pdev->dev, "%s: intr = 0x%04x\n",
528 dev_dbg(&pdev->dev, "Performing full reset\n");
529 uhci_reset_hc(pdev, base);
532 EXPORT_SYMBOL_GPL(uhci_check_and_reset_hc);
534 static inline int io_type_enabled(struct pci_dev *pdev, unsigned int mask)
537 return !pci_read_config_word(pdev, PCI_COMMAND, &cmd) && (cmd & mask);
540 #define pio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_IO)
541 #define mmio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_MEMORY)
543 static void quirk_usb_handoff_uhci(struct pci_dev *pdev)
545 unsigned long base = 0;
548 if (!pio_enabled(pdev))
551 for (i = 0; i < PCI_ROM_RESOURCE; i++)
552 if ((pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
553 base = pci_resource_start(pdev, i);
558 uhci_check_and_reset_hc(pdev, base);
561 static int mmio_resource_enabled(struct pci_dev *pdev, int idx)
563 return pci_resource_start(pdev, idx) && mmio_enabled(pdev);
566 static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
571 bool no_fminterval = false;
574 if (!mmio_resource_enabled(pdev, 0))
577 base = pci_ioremap_bar(pdev, 0);
582 * ULi M5237 OHCI controller locks the whole system when accessing
583 * the OHCI_FMINTERVAL offset.
585 if (pdev->vendor == PCI_VENDOR_ID_AL && pdev->device == 0x5237)
586 no_fminterval = true;
588 control = readl(base + OHCI_CONTROL);
590 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
592 #define OHCI_CTRL_MASK (OHCI_CTRL_RWC | OHCI_CTRL_IR)
594 #define OHCI_CTRL_MASK OHCI_CTRL_RWC
596 if (control & OHCI_CTRL_IR) {
597 int wait_time = 500; /* arbitrary; 5 seconds */
598 writel(OHCI_INTR_OC, base + OHCI_INTRENABLE);
599 writel(OHCI_OCR, base + OHCI_CMDSTATUS);
600 while (wait_time > 0 &&
601 readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
607 "OHCI: BIOS handoff failed (BIOS bug?) %08x\n",
608 readl(base + OHCI_CONTROL));
612 /* disable interrupts */
613 writel((u32) ~0, base + OHCI_INTRDISABLE);
615 /* Reset the USB bus, if the controller isn't already in RESET */
616 if (control & OHCI_HCFS) {
617 /* Go into RESET, preserving RWC (and possibly IR) */
618 writel(control & OHCI_CTRL_MASK, base + OHCI_CONTROL);
619 readl(base + OHCI_CONTROL);
621 /* drive bus reset for at least 50 ms (7.1.7.5) */
625 /* software reset of the controller, preserving HcFmInterval */
627 fminterval = readl(base + OHCI_FMINTERVAL);
629 writel(OHCI_HCR, base + OHCI_CMDSTATUS);
631 /* reset requires max 10 us delay */
632 for (cnt = 30; cnt > 0; --cnt) { /* ... allow extra time */
633 if ((readl(base + OHCI_CMDSTATUS) & OHCI_HCR) == 0)
639 writel(fminterval, base + OHCI_FMINTERVAL);
641 /* Now the controller is safely in SUSPEND and nothing can wake it up */
645 static const struct dmi_system_id ehci_dmi_nohandoff_table[] = {
647 /* Pegatron Lucid (ExoPC) */
649 DMI_MATCH(DMI_BOARD_NAME, "EXOPG06411"),
650 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-CE-133"),
654 /* Pegatron Lucid (Ordissimo AIRIS) */
656 DMI_MATCH(DMI_BOARD_NAME, "M11JB"),
657 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-"),
661 /* Pegatron Lucid (Ordissimo) */
663 DMI_MATCH(DMI_BOARD_NAME, "Ordissimo"),
664 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-"),
670 DMI_MATCH(DMI_BOARD_VENDOR, "HASEE"),
671 DMI_MATCH(DMI_BOARD_NAME, "E210"),
672 DMI_MATCH(DMI_BIOS_VERSION, "6.00"),
678 static void ehci_bios_handoff(struct pci_dev *pdev,
679 void __iomem *op_reg_base,
682 int try_handoff = 1, tried_handoff = 0;
685 * The Pegatron Lucid tablet sporadically waits for 98 seconds trying
686 * the handoff on its unused controller. Skip it.
688 * The HASEE E200 hangs when the semaphore is set (bugzilla #77021).
690 if (pdev->vendor == 0x8086 && (pdev->device == 0x283a ||
691 pdev->device == 0x27cc)) {
692 if (dmi_check_system(ehci_dmi_nohandoff_table))
696 if (try_handoff && (cap & EHCI_USBLEGSUP_BIOS)) {
697 dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
701 * but that seems dubious in general (the BIOS left it off intentionally)
702 * and is known to prevent some systems from booting. so we won't do this
703 * unless maybe we can determine when we're on a system that needs SMI forced.
705 /* BIOS workaround (?): be sure the pre-Linux code
708 pci_read_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, &val);
709 pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS,
710 val | EHCI_USBLEGCTLSTS_SOOE);
713 /* some systems get upset if this semaphore is
714 * set for any other reason than forcing a BIOS
717 pci_write_config_byte(pdev, offset + 3, 1);
720 /* if boot firmware now owns EHCI, spin till it hands it over. */
723 while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
727 pci_read_config_dword(pdev, offset, &cap);
731 if (cap & EHCI_USBLEGSUP_BIOS) {
732 /* well, possibly buggy BIOS... try to shut it down,
733 * and hope nothing goes too wrong
737 "EHCI: BIOS handoff failed (BIOS bug?) %08x\n",
739 pci_write_config_byte(pdev, offset + 2, 0);
742 /* just in case, always disable EHCI SMIs */
743 pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, 0);
745 /* If the BIOS ever owned the controller then we can't expect
746 * any power sessions to remain intact.
749 writel(0, op_reg_base + EHCI_CONFIGFLAG);
752 static void quirk_usb_disable_ehci(struct pci_dev *pdev)
754 void __iomem *base, *op_reg_base;
755 u32 hcc_params, cap, val;
756 u8 offset, cap_length;
757 int wait_time, count = 256/4;
759 if (!mmio_resource_enabled(pdev, 0))
762 base = pci_ioremap_bar(pdev, 0);
766 cap_length = readb(base);
767 op_reg_base = base + cap_length;
769 /* EHCI 0.96 and later may have "extended capabilities"
770 * spec section 5.1 explains the bios handoff, e.g. for
771 * booting from USB disk or using a usb keyboard
773 hcc_params = readl(base + EHCI_HCC_PARAMS);
774 offset = (hcc_params >> 8) & 0xff;
775 while (offset && --count) {
776 pci_read_config_dword(pdev, offset, &cap);
778 switch (cap & 0xff) {
780 ehci_bios_handoff(pdev, op_reg_base, cap, offset);
782 case 0: /* Illegal reserved cap, set cap=0 so we exit */
783 cap = 0; /* then fallthrough... */
786 "EHCI: unrecognized capability %02x\n",
789 offset = (cap >> 8) & 0xff;
792 dev_printk(KERN_DEBUG, &pdev->dev, "EHCI: capability loop?\n");
795 * halt EHCI & disable its interrupts in any case
797 val = readl(op_reg_base + EHCI_USBSTS);
798 if ((val & EHCI_USBSTS_HALTED) == 0) {
799 val = readl(op_reg_base + EHCI_USBCMD);
800 val &= ~EHCI_USBCMD_RUN;
801 writel(val, op_reg_base + EHCI_USBCMD);
805 writel(0x3f, op_reg_base + EHCI_USBSTS);
808 val = readl(op_reg_base + EHCI_USBSTS);
809 if ((val == ~(u32)0) || (val & EHCI_USBSTS_HALTED)) {
812 } while (wait_time > 0);
814 writel(0, op_reg_base + EHCI_USBINTR);
815 writel(0x3f, op_reg_base + EHCI_USBSTS);
821 * handshake - spin reading a register until handshake completes
822 * @ptr: address of hc register to be read
823 * @mask: bits to look at in result of read
824 * @done: value of those bits when handshake succeeds
825 * @wait_usec: timeout in microseconds
826 * @delay_usec: delay in microseconds to wait between polling
828 * Polls a register every delay_usec microseconds.
829 * Returns 0 when the mask bits have the value done.
830 * Returns -ETIMEDOUT if this condition is not true after
831 * wait_usec microseconds have passed.
833 static int handshake(void __iomem *ptr, u32 mask, u32 done,
834 int wait_usec, int delay_usec)
844 wait_usec -= delay_usec;
845 } while (wait_usec > 0);
850 * Intel's Panther Point chipset has two host controllers (EHCI and xHCI) that
851 * share some number of ports. These ports can be switched between either
852 * controller. Not all of the ports under the EHCI host controller may be
855 * The ports should be switched over to xHCI before PCI probes for any device
856 * start. This avoids active devices under EHCI being disconnected during the
857 * port switchover, which could cause loss of data on USB storage devices, or
858 * failed boot when the root file system is on a USB mass storage device and is
859 * enumerated under EHCI first.
861 * We write into the xHC's PCI configuration space in some Intel-specific
862 * registers to switch the ports over. The USB 3.0 terminations and the USB
863 * 2.0 data wires are switched separately. We want to enable the SuperSpeed
864 * terminations before switching the USB 2.0 wires over, so that USB 3.0
865 * devices connect at SuperSpeed, rather than at USB 2.0 speeds.
867 void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev)
870 bool ehci_found = false;
871 struct pci_dev *companion = NULL;
873 /* Sony VAIO t-series with subsystem device ID 90a8 is not capable of
874 * switching ports from EHCI to xHCI
876 if (xhci_pdev->subsystem_vendor == PCI_VENDOR_ID_SONY &&
877 xhci_pdev->subsystem_device == 0x90a8)
880 /* make sure an intel EHCI controller exists */
881 for_each_pci_dev(companion) {
882 if (companion->class == PCI_CLASS_SERIAL_USB_EHCI &&
883 companion->vendor == PCI_VENDOR_ID_INTEL) {
892 /* Don't switchover the ports if the user hasn't compiled the xHCI
893 * driver. Otherwise they will see "dead" USB ports that don't power
896 if (!IS_ENABLED(CONFIG_USB_XHCI_HCD)) {
897 dev_warn(&xhci_pdev->dev,
898 "CONFIG_USB_XHCI_HCD is turned off, defaulting to EHCI.\n");
899 dev_warn(&xhci_pdev->dev,
900 "USB 3.0 devices will work at USB 2.0 speeds.\n");
901 usb_disable_xhci_ports(xhci_pdev);
905 /* Read USB3PRM, the USB 3.0 Port Routing Mask Register
906 * Indicate the ports that can be changed from OS.
908 pci_read_config_dword(xhci_pdev, USB_INTEL_USB3PRM,
911 dev_dbg(&xhci_pdev->dev, "Configurable ports to enable SuperSpeed: 0x%x\n",
914 /* Write USB3_PSSEN, the USB 3.0 Port SuperSpeed Enable
915 * Register, to turn on SuperSpeed terminations for the
918 pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
921 pci_read_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
923 dev_dbg(&xhci_pdev->dev,
924 "USB 3.0 ports that are now enabled under xHCI: 0x%x\n",
927 /* Read XUSB2PRM, xHCI USB 2.0 Port Routing Mask Register
928 * Indicate the USB 2.0 ports to be controlled by the xHCI host.
931 pci_read_config_dword(xhci_pdev, USB_INTEL_USB2PRM,
934 dev_dbg(&xhci_pdev->dev, "Configurable USB 2.0 ports to hand over to xCHI: 0x%x\n",
937 /* Write XUSB2PR, the xHC USB 2.0 Port Routing Register, to
938 * switch the USB 2.0 power and data lines over to the xHCI
941 pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
944 pci_read_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
946 dev_dbg(&xhci_pdev->dev,
947 "USB 2.0 ports that are now switched over to xHCI: 0x%x\n",
950 EXPORT_SYMBOL_GPL(usb_enable_intel_xhci_ports);
952 void usb_disable_xhci_ports(struct pci_dev *xhci_pdev)
954 pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN, 0x0);
955 pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR, 0x0);
957 EXPORT_SYMBOL_GPL(usb_disable_xhci_ports);
960 * PCI Quirks for xHCI.
962 * Takes care of the handoff between the Pre-OS (i.e. BIOS) and the OS.
963 * It signals to the BIOS that the OS wants control of the host controller,
964 * and then waits 5 seconds for the BIOS to hand over control.
965 * If we timeout, assume the BIOS is broken and take control anyway.
967 static void quirk_usb_handoff_xhci(struct pci_dev *pdev)
971 void __iomem *op_reg_base;
974 int len = pci_resource_len(pdev, 0);
976 if (!mmio_resource_enabled(pdev, 0))
979 base = ioremap_nocache(pci_resource_start(pdev, 0), len);
984 * Find the Legacy Support Capability register -
985 * this is optional for xHCI host controllers.
987 ext_cap_offset = xhci_find_next_cap_offset(base, XHCI_HCC_PARAMS_OFFSET);
989 if ((ext_cap_offset + sizeof(val)) > len) {
990 /* We're reading garbage from the controller */
992 "xHCI controller failing to respond");
997 /* We've reached the end of the extended capabilities */
1000 val = readl(base + ext_cap_offset);
1001 if (XHCI_EXT_CAPS_ID(val) == XHCI_EXT_CAPS_LEGACY)
1003 ext_cap_offset = xhci_find_next_cap_offset(base, ext_cap_offset);
1006 /* If the BIOS owns the HC, signal that the OS wants it, and wait */
1007 if (val & XHCI_HC_BIOS_OWNED) {
1008 writel(val | XHCI_HC_OS_OWNED, base + ext_cap_offset);
1010 /* Wait for 5 seconds with 10 microsecond polling interval */
1011 timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED,
1014 /* Assume a buggy BIOS and take HC ownership anyway */
1016 dev_warn(&pdev->dev,
1017 "xHCI BIOS handoff failed (BIOS bug ?) %08x\n",
1019 writel(val & ~XHCI_HC_BIOS_OWNED, base + ext_cap_offset);
1023 val = readl(base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
1024 /* Mask off (turn off) any enabled SMIs */
1025 val &= XHCI_LEGACY_DISABLE_SMI;
1026 /* Mask all SMI events bits, RW1C */
1027 val |= XHCI_LEGACY_SMI_EVENTS;
1028 /* Disable any BIOS SMIs and clear all SMI events*/
1029 writel(val, base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
1032 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
1033 usb_enable_intel_xhci_ports(pdev);
1035 op_reg_base = base + XHCI_HC_LENGTH(readl(base));
1037 /* Wait for the host controller to be ready before writing any
1038 * operational or runtime registers. Wait 5 seconds and no more.
1040 timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_CNR, 0,
1042 /* Assume a buggy HC and start HC initialization anyway */
1044 val = readl(op_reg_base + XHCI_STS_OFFSET);
1045 dev_warn(&pdev->dev,
1046 "xHCI HW not ready after 5 sec (HC bug?) status = 0x%x\n",
1050 /* Send the halt and disable interrupts command */
1051 val = readl(op_reg_base + XHCI_CMD_OFFSET);
1052 val &= ~(XHCI_CMD_RUN | XHCI_IRQS);
1053 writel(val, op_reg_base + XHCI_CMD_OFFSET);
1055 /* Wait for the HC to halt - poll every 125 usec (one microframe). */
1056 timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_HALT, 1,
1057 XHCI_MAX_HALT_USEC, 125);
1059 val = readl(op_reg_base + XHCI_STS_OFFSET);
1060 dev_warn(&pdev->dev,
1061 "xHCI HW did not halt within %d usec status = 0x%x\n",
1062 XHCI_MAX_HALT_USEC, val);
1068 static void quirk_usb_early_handoff(struct pci_dev *pdev)
1070 /* Skip Netlogic mips SoC's internal PCI USB controller.
1071 * This device does not need/support EHCI/OHCI handoff
1073 if (pdev->vendor == 0x184e) /* vendor Netlogic */
1075 if (pdev->class != PCI_CLASS_SERIAL_USB_UHCI &&
1076 pdev->class != PCI_CLASS_SERIAL_USB_OHCI &&
1077 pdev->class != PCI_CLASS_SERIAL_USB_EHCI &&
1078 pdev->class != PCI_CLASS_SERIAL_USB_XHCI)
1081 if (pci_enable_device(pdev) < 0) {
1082 dev_warn(&pdev->dev,
1083 "Can't enable PCI device, BIOS handoff failed.\n");
1086 if (pdev->class == PCI_CLASS_SERIAL_USB_UHCI)
1087 quirk_usb_handoff_uhci(pdev);
1088 else if (pdev->class == PCI_CLASS_SERIAL_USB_OHCI)
1089 quirk_usb_handoff_ohci(pdev);
1090 else if (pdev->class == PCI_CLASS_SERIAL_USB_EHCI)
1091 quirk_usb_disable_ehci(pdev);
1092 else if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI)
1093 quirk_usb_handoff_xhci(pdev);
1094 pci_disable_device(pdev);
1096 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
1097 PCI_CLASS_SERIAL_USB, 8, quirk_usb_early_handoff);