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/kernel.h>
13 #include <linux/pci.h>
14 #include <linux/init.h>
15 #include <linux/delay.h>
16 #include <linux/acpi.h>
17 #include <linux/dmi.h>
18 #include "pci-quirks.h"
19 #include "xhci-ext-caps.h"
22 #define UHCI_USBLEGSUP 0xc0 /* legacy support */
23 #define UHCI_USBCMD 0 /* command register */
24 #define UHCI_USBINTR 4 /* interrupt register */
25 #define UHCI_USBLEGSUP_RWC 0x8f00 /* the R/WC bits */
26 #define UHCI_USBLEGSUP_RO 0x5040 /* R/O and reserved bits */
27 #define UHCI_USBCMD_RUN 0x0001 /* RUN/STOP bit */
28 #define UHCI_USBCMD_HCRESET 0x0002 /* Host Controller reset */
29 #define UHCI_USBCMD_EGSM 0x0008 /* Global Suspend Mode */
30 #define UHCI_USBCMD_CONFIGURE 0x0040 /* Config Flag */
31 #define UHCI_USBINTR_RESUME 0x0002 /* Resume interrupt enable */
33 #define OHCI_CONTROL 0x04
34 #define OHCI_CMDSTATUS 0x08
35 #define OHCI_INTRSTATUS 0x0c
36 #define OHCI_INTRENABLE 0x10
37 #define OHCI_INTRDISABLE 0x14
38 #define OHCI_FMINTERVAL 0x34
39 #define OHCI_HCFS (3 << 6) /* hc functional state */
40 #define OHCI_HCR (1 << 0) /* host controller reset */
41 #define OHCI_OCR (1 << 3) /* ownership change request */
42 #define OHCI_CTRL_RWC (1 << 9) /* remote wakeup connected */
43 #define OHCI_CTRL_IR (1 << 8) /* interrupt routing */
44 #define OHCI_INTR_OC (1 << 30) /* ownership change */
46 #define EHCI_HCC_PARAMS 0x08 /* extended capabilities */
47 #define EHCI_USBCMD 0 /* command register */
48 #define EHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */
49 #define EHCI_USBSTS 4 /* status register */
50 #define EHCI_USBSTS_HALTED (1 << 12) /* HCHalted bit */
51 #define EHCI_USBINTR 8 /* interrupt register */
52 #define EHCI_CONFIGFLAG 0x40 /* configured flag register */
53 #define EHCI_USBLEGSUP 0 /* legacy support register */
54 #define EHCI_USBLEGSUP_BIOS (1 << 16) /* BIOS semaphore */
55 #define EHCI_USBLEGSUP_OS (1 << 24) /* OS semaphore */
56 #define EHCI_USBLEGCTLSTS 4 /* legacy control/status */
57 #define EHCI_USBLEGCTLSTS_SOOE (1 << 13) /* SMI on ownership change */
60 #define AB_REG_BAR_LOW 0xe0
61 #define AB_REG_BAR_HIGH 0xe1
62 #define AB_REG_BAR_SB700 0xf0
63 #define AB_INDX(addr) ((addr) + 0x00)
64 #define AB_DATA(addr) ((addr) + 0x04)
68 #define NB_PCIE_INDX_ADDR 0xe0
69 #define NB_PCIE_INDX_DATA 0xe4
70 #define PCIE_P_CNTL 0x10040
71 #define BIF_NB 0x10002
72 #define NB_PIF0_PWRDOWN_0 0x01100012
73 #define NB_PIF0_PWRDOWN_1 0x01100013
75 #define USB_INTEL_XUSB2PR 0xD0
76 #define USB_INTEL_USB3_PSSEN 0xD8
78 static struct amd_chipset_info
{
79 struct pci_dev
*nb_dev
;
80 struct pci_dev
*smbus_dev
;
88 static DEFINE_SPINLOCK(amd_lock
);
90 int usb_amd_find_chipset_info(void)
94 struct amd_chipset_info info
;
97 spin_lock_irqsave(&amd_lock
, flags
);
100 if (amd_chipset
.probe_count
> 0) {
101 amd_chipset
.probe_count
++;
102 spin_unlock_irqrestore(&amd_lock
, flags
);
103 return amd_chipset
.probe_result
;
105 memset(&info
, 0, sizeof(info
));
106 spin_unlock_irqrestore(&amd_lock
, flags
);
108 info
.smbus_dev
= pci_get_device(PCI_VENDOR_ID_ATI
, 0x4385, NULL
);
109 if (info
.smbus_dev
) {
110 rev
= info
.smbus_dev
->revision
;
113 else if (rev
>= 0x30 && rev
<= 0x3b)
116 info
.smbus_dev
= pci_get_device(PCI_VENDOR_ID_AMD
,
118 if (!info
.smbus_dev
) {
123 rev
= info
.smbus_dev
->revision
;
124 if (rev
>= 0x11 && rev
<= 0x18)
128 if (info
.sb_type
== 0) {
129 if (info
.smbus_dev
) {
130 pci_dev_put(info
.smbus_dev
);
131 info
.smbus_dev
= NULL
;
137 info
.nb_dev
= pci_get_device(PCI_VENDOR_ID_AMD
, 0x9601, NULL
);
141 info
.nb_dev
= pci_get_device(PCI_VENDOR_ID_AMD
, 0x1510, NULL
);
145 info
.nb_dev
= pci_get_device(PCI_VENDOR_ID_AMD
,
152 ret
= info
.probe_result
= 1;
153 printk(KERN_DEBUG
"QUIRK: Enable AMD PLL fix\n");
157 spin_lock_irqsave(&amd_lock
, flags
);
158 if (amd_chipset
.probe_count
> 0) {
159 /* race - someone else was faster - drop devices */
161 /* Mark that we where here */
162 amd_chipset
.probe_count
++;
163 ret
= amd_chipset
.probe_result
;
165 spin_unlock_irqrestore(&amd_lock
, flags
);
168 pci_dev_put(info
.nb_dev
);
170 pci_dev_put(info
.smbus_dev
);
173 /* no race - commit the result */
176 spin_unlock_irqrestore(&amd_lock
, flags
);
181 EXPORT_SYMBOL_GPL(usb_amd_find_chipset_info
);
184 * The hardware normally enables the A-link power management feature, which
185 * lets the system lower the power consumption in idle states.
187 * This USB quirk prevents the link going into that lower power state
188 * during isochronous transfers.
190 * Without this quirk, isochronous stream on OHCI/EHCI/xHCI controllers of
191 * some AMD platforms may stutter or have breaks occasionally.
193 static void usb_amd_quirk_pll(int disable
)
195 u32 addr
, addr_low
, addr_high
, val
;
196 u32 bit
= disable
? 0 : 1;
199 spin_lock_irqsave(&amd_lock
, flags
);
202 amd_chipset
.isoc_reqs
++;
203 if (amd_chipset
.isoc_reqs
> 1) {
204 spin_unlock_irqrestore(&amd_lock
, flags
);
208 amd_chipset
.isoc_reqs
--;
209 if (amd_chipset
.isoc_reqs
> 0) {
210 spin_unlock_irqrestore(&amd_lock
, flags
);
215 if (amd_chipset
.sb_type
== 1 || amd_chipset
.sb_type
== 2) {
216 outb_p(AB_REG_BAR_LOW
, 0xcd6);
217 addr_low
= inb_p(0xcd7);
218 outb_p(AB_REG_BAR_HIGH
, 0xcd6);
219 addr_high
= inb_p(0xcd7);
220 addr
= addr_high
<< 8 | addr_low
;
222 outl_p(0x30, AB_INDX(addr
));
223 outl_p(0x40, AB_DATA(addr
));
224 outl_p(0x34, AB_INDX(addr
));
225 val
= inl_p(AB_DATA(addr
));
226 } else if (amd_chipset
.sb_type
== 3) {
227 pci_read_config_dword(amd_chipset
.smbus_dev
,
228 AB_REG_BAR_SB700
, &addr
);
229 outl(AX_INDXC
, AB_INDX(addr
));
230 outl(0x40, AB_DATA(addr
));
231 outl(AX_DATAC
, AB_INDX(addr
));
232 val
= inl(AB_DATA(addr
));
234 spin_unlock_irqrestore(&amd_lock
, flags
);
240 val
|= (1 << 4) | (1 << 9);
243 val
&= ~((1 << 4) | (1 << 9));
245 outl_p(val
, AB_DATA(addr
));
247 if (!amd_chipset
.nb_dev
) {
248 spin_unlock_irqrestore(&amd_lock
, flags
);
252 if (amd_chipset
.nb_type
== 1 || amd_chipset
.nb_type
== 3) {
254 pci_write_config_dword(amd_chipset
.nb_dev
,
255 NB_PCIE_INDX_ADDR
, addr
);
256 pci_read_config_dword(amd_chipset
.nb_dev
,
257 NB_PCIE_INDX_DATA
, &val
);
259 val
&= ~(1 | (1 << 3) | (1 << 4) | (1 << 9) | (1 << 12));
260 val
|= bit
| (bit
<< 3) | (bit
<< 12);
261 val
|= ((!bit
) << 4) | ((!bit
) << 9);
262 pci_write_config_dword(amd_chipset
.nb_dev
,
263 NB_PCIE_INDX_DATA
, val
);
266 pci_write_config_dword(amd_chipset
.nb_dev
,
267 NB_PCIE_INDX_ADDR
, addr
);
268 pci_read_config_dword(amd_chipset
.nb_dev
,
269 NB_PCIE_INDX_DATA
, &val
);
273 pci_write_config_dword(amd_chipset
.nb_dev
,
274 NB_PCIE_INDX_DATA
, val
);
275 } else if (amd_chipset
.nb_type
== 2) {
276 addr
= NB_PIF0_PWRDOWN_0
;
277 pci_write_config_dword(amd_chipset
.nb_dev
,
278 NB_PCIE_INDX_ADDR
, addr
);
279 pci_read_config_dword(amd_chipset
.nb_dev
,
280 NB_PCIE_INDX_DATA
, &val
);
286 pci_write_config_dword(amd_chipset
.nb_dev
,
287 NB_PCIE_INDX_DATA
, val
);
289 addr
= NB_PIF0_PWRDOWN_1
;
290 pci_write_config_dword(amd_chipset
.nb_dev
,
291 NB_PCIE_INDX_ADDR
, addr
);
292 pci_read_config_dword(amd_chipset
.nb_dev
,
293 NB_PCIE_INDX_DATA
, &val
);
299 pci_write_config_dword(amd_chipset
.nb_dev
,
300 NB_PCIE_INDX_DATA
, val
);
303 spin_unlock_irqrestore(&amd_lock
, flags
);
307 void usb_amd_quirk_pll_disable(void)
309 usb_amd_quirk_pll(1);
311 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_disable
);
313 void usb_amd_quirk_pll_enable(void)
315 usb_amd_quirk_pll(0);
317 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_enable
);
319 void usb_amd_dev_put(void)
321 struct pci_dev
*nb
, *smbus
;
324 spin_lock_irqsave(&amd_lock
, flags
);
326 amd_chipset
.probe_count
--;
327 if (amd_chipset
.probe_count
> 0) {
328 spin_unlock_irqrestore(&amd_lock
, flags
);
332 /* save them to pci_dev_put outside of spinlock */
333 nb
= amd_chipset
.nb_dev
;
334 smbus
= amd_chipset
.smbus_dev
;
336 amd_chipset
.nb_dev
= NULL
;
337 amd_chipset
.smbus_dev
= NULL
;
338 amd_chipset
.nb_type
= 0;
339 amd_chipset
.sb_type
= 0;
340 amd_chipset
.isoc_reqs
= 0;
341 amd_chipset
.probe_result
= 0;
343 spin_unlock_irqrestore(&amd_lock
, flags
);
350 EXPORT_SYMBOL_GPL(usb_amd_dev_put
);
353 * Make sure the controller is completely inactive, unable to
354 * generate interrupts or do DMA.
356 void uhci_reset_hc(struct pci_dev
*pdev
, unsigned long base
)
358 /* Turn off PIRQ enable and SMI enable. (This also turns off the
359 * BIOS's USB Legacy Support.) Turn off all the R/WC bits too.
361 pci_write_config_word(pdev
, UHCI_USBLEGSUP
, UHCI_USBLEGSUP_RWC
);
363 /* Reset the HC - this will force us to get a
364 * new notification of any already connected
365 * ports due to the virtual disconnect that it
368 outw(UHCI_USBCMD_HCRESET
, base
+ UHCI_USBCMD
);
371 if (inw(base
+ UHCI_USBCMD
) & UHCI_USBCMD_HCRESET
)
372 dev_warn(&pdev
->dev
, "HCRESET not completed yet!\n");
374 /* Just to be safe, disable interrupt requests and
375 * make sure the controller is stopped.
377 outw(0, base
+ UHCI_USBINTR
);
378 outw(0, base
+ UHCI_USBCMD
);
380 EXPORT_SYMBOL_GPL(uhci_reset_hc
);
383 * Initialize a controller that was newly discovered or has just been
384 * resumed. In either case we can't be sure of its previous state.
386 * Returns: 1 if the controller was reset, 0 otherwise.
388 int uhci_check_and_reset_hc(struct pci_dev
*pdev
, unsigned long base
)
391 unsigned int cmd
, intr
;
394 * When restarting a suspended controller, we expect all the
395 * settings to be the same as we left them:
397 * PIRQ and SMI disabled, no R/W bits set in USBLEGSUP;
398 * Controller is stopped and configured with EGSM set;
399 * No interrupts enabled except possibly Resume Detect.
401 * If any of these conditions are violated we do a complete reset.
403 pci_read_config_word(pdev
, UHCI_USBLEGSUP
, &legsup
);
404 if (legsup
& ~(UHCI_USBLEGSUP_RO
| UHCI_USBLEGSUP_RWC
)) {
405 dev_dbg(&pdev
->dev
, "%s: legsup = 0x%04x\n",
410 cmd
= inw(base
+ UHCI_USBCMD
);
411 if ((cmd
& UHCI_USBCMD_RUN
) || !(cmd
& UHCI_USBCMD_CONFIGURE
) ||
412 !(cmd
& UHCI_USBCMD_EGSM
)) {
413 dev_dbg(&pdev
->dev
, "%s: cmd = 0x%04x\n",
418 intr
= inw(base
+ UHCI_USBINTR
);
419 if (intr
& (~UHCI_USBINTR_RESUME
)) {
420 dev_dbg(&pdev
->dev
, "%s: intr = 0x%04x\n",
427 dev_dbg(&pdev
->dev
, "Performing full reset\n");
428 uhci_reset_hc(pdev
, base
);
431 EXPORT_SYMBOL_GPL(uhci_check_and_reset_hc
);
433 static inline int io_type_enabled(struct pci_dev
*pdev
, unsigned int mask
)
436 return !pci_read_config_word(pdev
, PCI_COMMAND
, &cmd
) && (cmd
& mask
);
439 #define pio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_IO)
440 #define mmio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_MEMORY)
442 static void __devinit
quirk_usb_handoff_uhci(struct pci_dev
*pdev
)
444 unsigned long base
= 0;
447 if (!pio_enabled(pdev
))
450 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
451 if ((pci_resource_flags(pdev
, i
) & IORESOURCE_IO
)) {
452 base
= pci_resource_start(pdev
, i
);
457 uhci_check_and_reset_hc(pdev
, base
);
460 static int __devinit
mmio_resource_enabled(struct pci_dev
*pdev
, int idx
)
462 return pci_resource_start(pdev
, idx
) && mmio_enabled(pdev
);
465 static void __devinit
quirk_usb_handoff_ohci(struct pci_dev
*pdev
)
472 if (!mmio_resource_enabled(pdev
, 0))
475 base
= pci_ioremap_bar(pdev
, 0);
479 control
= readl(base
+ OHCI_CONTROL
);
481 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
483 #define OHCI_CTRL_MASK (OHCI_CTRL_RWC | OHCI_CTRL_IR)
485 #define OHCI_CTRL_MASK OHCI_CTRL_RWC
487 if (control
& OHCI_CTRL_IR
) {
488 int wait_time
= 500; /* arbitrary; 5 seconds */
489 writel(OHCI_INTR_OC
, base
+ OHCI_INTRENABLE
);
490 writel(OHCI_OCR
, base
+ OHCI_CMDSTATUS
);
491 while (wait_time
> 0 &&
492 readl(base
+ OHCI_CONTROL
) & OHCI_CTRL_IR
) {
497 dev_warn(&pdev
->dev
, "OHCI: BIOS handoff failed"
498 " (BIOS bug?) %08x\n",
499 readl(base
+ OHCI_CONTROL
));
503 /* disable interrupts */
504 writel((u32
) ~0, base
+ OHCI_INTRDISABLE
);
506 /* Reset the USB bus, if the controller isn't already in RESET */
507 if (control
& OHCI_HCFS
) {
508 /* Go into RESET, preserving RWC (and possibly IR) */
509 writel(control
& OHCI_CTRL_MASK
, base
+ OHCI_CONTROL
);
510 readl(base
+ OHCI_CONTROL
);
512 /* drive bus reset for at least 50 ms (7.1.7.5) */
516 /* software reset of the controller, preserving HcFmInterval */
517 fminterval
= readl(base
+ OHCI_FMINTERVAL
);
518 writel(OHCI_HCR
, base
+ OHCI_CMDSTATUS
);
520 /* reset requires max 10 us delay */
521 for (cnt
= 30; cnt
> 0; --cnt
) { /* ... allow extra time */
522 if ((readl(base
+ OHCI_CMDSTATUS
) & OHCI_HCR
) == 0)
526 writel(fminterval
, base
+ OHCI_FMINTERVAL
);
528 /* Now the controller is safely in SUSPEND and nothing can wake it up */
532 static const struct dmi_system_id __devinitconst ehci_dmi_nohandoff_table
[] = {
534 /* Pegatron Lucid (ExoPC) */
536 DMI_MATCH(DMI_BOARD_NAME
, "EXOPG06411"),
537 DMI_MATCH(DMI_BIOS_VERSION
, "Lucid-CE-133"),
541 /* Pegatron Lucid (Ordissimo AIRIS) */
543 DMI_MATCH(DMI_BOARD_NAME
, "M11JB"),
544 DMI_MATCH(DMI_BIOS_VERSION
, "Lucid-GE-133"),
550 static void __devinit
ehci_bios_handoff(struct pci_dev
*pdev
,
551 void __iomem
*op_reg_base
,
554 int try_handoff
= 1, tried_handoff
= 0;
556 /* The Pegatron Lucid tablet sporadically waits for 98 seconds trying
557 * the handoff on its unused controller. Skip it. */
558 if (pdev
->vendor
== 0x8086 && pdev
->device
== 0x283a) {
559 if (dmi_check_system(ehci_dmi_nohandoff_table
))
563 if (try_handoff
&& (cap
& EHCI_USBLEGSUP_BIOS
)) {
564 dev_dbg(&pdev
->dev
, "EHCI: BIOS handoff\n");
567 /* aleksey_gorelov@phoenix.com reports that some systems need SMI forced on,
568 * but that seems dubious in general (the BIOS left it off intentionally)
569 * and is known to prevent some systems from booting. so we won't do this
570 * unless maybe we can determine when we're on a system that needs SMI forced.
572 /* BIOS workaround (?): be sure the pre-Linux code
575 pci_read_config_dword(pdev
, offset
+ EHCI_USBLEGCTLSTS
, &val
);
576 pci_write_config_dword(pdev
, offset
+ EHCI_USBLEGCTLSTS
,
577 val
| EHCI_USBLEGCTLSTS_SOOE
);
580 /* some systems get upset if this semaphore is
581 * set for any other reason than forcing a BIOS
584 pci_write_config_byte(pdev
, offset
+ 3, 1);
587 /* if boot firmware now owns EHCI, spin till it hands it over. */
590 while ((cap
& EHCI_USBLEGSUP_BIOS
) && (msec
> 0)) {
594 pci_read_config_dword(pdev
, offset
, &cap
);
598 if (cap
& EHCI_USBLEGSUP_BIOS
) {
599 /* well, possibly buggy BIOS... try to shut it down,
600 * and hope nothing goes too wrong
603 dev_warn(&pdev
->dev
, "EHCI: BIOS handoff failed"
604 " (BIOS bug?) %08x\n", cap
);
605 pci_write_config_byte(pdev
, offset
+ 2, 0);
608 /* just in case, always disable EHCI SMIs */
609 pci_write_config_dword(pdev
, offset
+ EHCI_USBLEGCTLSTS
, 0);
611 /* If the BIOS ever owned the controller then we can't expect
612 * any power sessions to remain intact.
615 writel(0, op_reg_base
+ EHCI_CONFIGFLAG
);
618 static void __devinit
quirk_usb_disable_ehci(struct pci_dev
*pdev
)
620 void __iomem
*base
, *op_reg_base
;
621 u32 hcc_params
, cap
, val
;
622 u8 offset
, cap_length
;
623 int wait_time
, count
= 256/4;
625 if (!mmio_resource_enabled(pdev
, 0))
628 base
= pci_ioremap_bar(pdev
, 0);
632 cap_length
= readb(base
);
633 op_reg_base
= base
+ cap_length
;
635 /* EHCI 0.96 and later may have "extended capabilities"
636 * spec section 5.1 explains the bios handoff, e.g. for
637 * booting from USB disk or using a usb keyboard
639 hcc_params
= readl(base
+ EHCI_HCC_PARAMS
);
640 offset
= (hcc_params
>> 8) & 0xff;
641 while (offset
&& --count
) {
642 pci_read_config_dword(pdev
, offset
, &cap
);
644 switch (cap
& 0xff) {
646 ehci_bios_handoff(pdev
, op_reg_base
, cap
, offset
);
648 case 0: /* Illegal reserved cap, set cap=0 so we exit */
649 cap
= 0; /* then fallthrough... */
651 dev_warn(&pdev
->dev
, "EHCI: unrecognized capability "
652 "%02x\n", cap
& 0xff);
654 offset
= (cap
>> 8) & 0xff;
657 dev_printk(KERN_DEBUG
, &pdev
->dev
, "EHCI: capability loop?\n");
660 * halt EHCI & disable its interrupts in any case
662 val
= readl(op_reg_base
+ EHCI_USBSTS
);
663 if ((val
& EHCI_USBSTS_HALTED
) == 0) {
664 val
= readl(op_reg_base
+ EHCI_USBCMD
);
665 val
&= ~EHCI_USBCMD_RUN
;
666 writel(val
, op_reg_base
+ EHCI_USBCMD
);
670 writel(0x3f, op_reg_base
+ EHCI_USBSTS
);
673 val
= readl(op_reg_base
+ EHCI_USBSTS
);
674 if ((val
== ~(u32
)0) || (val
& EHCI_USBSTS_HALTED
)) {
677 } while (wait_time
> 0);
679 writel(0, op_reg_base
+ EHCI_USBINTR
);
680 writel(0x3f, op_reg_base
+ EHCI_USBSTS
);
686 * handshake - spin reading a register until handshake completes
687 * @ptr: address of hc register to be read
688 * @mask: bits to look at in result of read
689 * @done: value of those bits when handshake succeeds
690 * @wait_usec: timeout in microseconds
691 * @delay_usec: delay in microseconds to wait between polling
693 * Polls a register every delay_usec microseconds.
694 * Returns 0 when the mask bits have the value done.
695 * Returns -ETIMEDOUT if this condition is not true after
696 * wait_usec microseconds have passed.
698 static int handshake(void __iomem
*ptr
, u32 mask
, u32 done
,
699 int wait_usec
, int delay_usec
)
709 wait_usec
-= delay_usec
;
710 } while (wait_usec
> 0);
714 bool usb_is_intel_switchable_xhci(struct pci_dev
*pdev
)
716 return pdev
->class == PCI_CLASS_SERIAL_USB_XHCI
&&
717 pdev
->vendor
== PCI_VENDOR_ID_INTEL
&&
718 pdev
->device
== PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI
;
720 EXPORT_SYMBOL_GPL(usb_is_intel_switchable_xhci
);
723 * Intel's Panther Point chipset has two host controllers (EHCI and xHCI) that
724 * share some number of ports. These ports can be switched between either
725 * controller. Not all of the ports under the EHCI host controller may be
728 * The ports should be switched over to xHCI before PCI probes for any device
729 * start. This avoids active devices under EHCI being disconnected during the
730 * port switchover, which could cause loss of data on USB storage devices, or
731 * failed boot when the root file system is on a USB mass storage device and is
732 * enumerated under EHCI first.
734 * We write into the xHC's PCI configuration space in some Intel-specific
735 * registers to switch the ports over. The USB 3.0 terminations and the USB
736 * 2.0 data wires are switched separately. We want to enable the SuperSpeed
737 * terminations before switching the USB 2.0 wires over, so that USB 3.0
738 * devices connect at SuperSpeed, rather than at USB 2.0 speeds.
740 void usb_enable_xhci_ports(struct pci_dev
*xhci_pdev
)
744 ports_available
= 0xffffffff;
745 /* Write USB3_PSSEN, the USB 3.0 Port SuperSpeed Enable
746 * Register, to turn on SuperSpeed terminations for all
749 pci_write_config_dword(xhci_pdev
, USB_INTEL_USB3_PSSEN
,
750 cpu_to_le32(ports_available
));
752 pci_read_config_dword(xhci_pdev
, USB_INTEL_USB3_PSSEN
,
754 dev_dbg(&xhci_pdev
->dev
, "USB 3.0 ports that are now enabled "
755 "under xHCI: 0x%x\n", ports_available
);
757 ports_available
= 0xffffffff;
758 /* Write XUSB2PR, the xHC USB 2.0 Port Routing Register, to
759 * switch the USB 2.0 power and data lines over to the xHCI
762 pci_write_config_dword(xhci_pdev
, USB_INTEL_XUSB2PR
,
763 cpu_to_le32(ports_available
));
765 pci_read_config_dword(xhci_pdev
, USB_INTEL_XUSB2PR
,
767 dev_dbg(&xhci_pdev
->dev
, "USB 2.0 ports that are now switched over "
768 "to xHCI: 0x%x\n", ports_available
);
770 EXPORT_SYMBOL_GPL(usb_enable_xhci_ports
);
773 * PCI Quirks for xHCI.
775 * Takes care of the handoff between the Pre-OS (i.e. BIOS) and the OS.
776 * It signals to the BIOS that the OS wants control of the host controller,
777 * and then waits 5 seconds for the BIOS to hand over control.
778 * If we timeout, assume the BIOS is broken and take control anyway.
780 static void __devinit
quirk_usb_handoff_xhci(struct pci_dev
*pdev
)
784 void __iomem
*op_reg_base
;
788 if (!mmio_resource_enabled(pdev
, 0))
791 base
= ioremap_nocache(pci_resource_start(pdev
, 0),
792 pci_resource_len(pdev
, 0));
797 * Find the Legacy Support Capability register -
798 * this is optional for xHCI host controllers.
800 ext_cap_offset
= xhci_find_next_cap_offset(base
, XHCI_HCC_PARAMS_OFFSET
);
803 /* We've reached the end of the extended capabilities */
805 val
= readl(base
+ ext_cap_offset
);
806 if (XHCI_EXT_CAPS_ID(val
) == XHCI_EXT_CAPS_LEGACY
)
808 ext_cap_offset
= xhci_find_next_cap_offset(base
, ext_cap_offset
);
811 /* If the BIOS owns the HC, signal that the OS wants it, and wait */
812 if (val
& XHCI_HC_BIOS_OWNED
) {
813 writel(val
| XHCI_HC_OS_OWNED
, base
+ ext_cap_offset
);
815 /* Wait for 5 seconds with 10 microsecond polling interval */
816 timeout
= handshake(base
+ ext_cap_offset
, XHCI_HC_BIOS_OWNED
,
819 /* Assume a buggy BIOS and take HC ownership anyway */
821 dev_warn(&pdev
->dev
, "xHCI BIOS handoff failed"
822 " (BIOS bug ?) %08x\n", val
);
823 writel(val
& ~XHCI_HC_BIOS_OWNED
, base
+ ext_cap_offset
);
827 /* Disable any BIOS SMIs */
828 writel(XHCI_LEGACY_DISABLE_SMI
,
829 base
+ ext_cap_offset
+ XHCI_LEGACY_CONTROL_OFFSET
);
831 if (usb_is_intel_switchable_xhci(pdev
))
832 usb_enable_xhci_ports(pdev
);
834 op_reg_base
= base
+ XHCI_HC_LENGTH(readl(base
));
836 /* Wait for the host controller to be ready before writing any
837 * operational or runtime registers. Wait 5 seconds and no more.
839 timeout
= handshake(op_reg_base
+ XHCI_STS_OFFSET
, XHCI_STS_CNR
, 0,
841 /* Assume a buggy HC and start HC initialization anyway */
843 val
= readl(op_reg_base
+ XHCI_STS_OFFSET
);
845 "xHCI HW not ready after 5 sec (HC bug?) "
846 "status = 0x%x\n", val
);
849 /* Send the halt and disable interrupts command */
850 val
= readl(op_reg_base
+ XHCI_CMD_OFFSET
);
851 val
&= ~(XHCI_CMD_RUN
| XHCI_IRQS
);
852 writel(val
, op_reg_base
+ XHCI_CMD_OFFSET
);
854 /* Wait for the HC to halt - poll every 125 usec (one microframe). */
855 timeout
= handshake(op_reg_base
+ XHCI_STS_OFFSET
, XHCI_STS_HALT
, 1,
856 XHCI_MAX_HALT_USEC
, 125);
858 val
= readl(op_reg_base
+ XHCI_STS_OFFSET
);
860 "xHCI HW did not halt within %d usec "
861 "status = 0x%x\n", XHCI_MAX_HALT_USEC
, val
);
867 static void __devinit
quirk_usb_early_handoff(struct pci_dev
*pdev
)
869 if (pdev
->class == PCI_CLASS_SERIAL_USB_UHCI
)
870 quirk_usb_handoff_uhci(pdev
);
871 else if (pdev
->class == PCI_CLASS_SERIAL_USB_OHCI
)
872 quirk_usb_handoff_ohci(pdev
);
873 else if (pdev
->class == PCI_CLASS_SERIAL_USB_EHCI
)
874 quirk_usb_disable_ehci(pdev
);
875 else if (pdev
->class == PCI_CLASS_SERIAL_USB_XHCI
)
876 quirk_usb_handoff_xhci(pdev
);
878 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID
, PCI_ANY_ID
, quirk_usb_early_handoff
);