1// SPDX-License-Identifier: GPL-2.0
2/*
3 * xHCI host controller driver PCI Bus Glue.
4 *
5 * Copyright (C) 2008 Intel Corp.
6 *
7 * Author: Sarah Sharp
8 * Some code borrowed from the Linux EHCI driver.
9 */
10
11#include <linux/pci.h>
12#include <linux/slab.h>
13#include <linux/module.h>
14#include <linux/acpi.h>
15#include <linux/reset.h>
16#include <linux/suspend.h>
17
18#include "xhci.h"
19#include "xhci-trace.h"
20#include "xhci-pci.h"
21
22#define SSIC_PORT_NUM 2
23#define SSIC_PORT_CFG2 0x880c
24#define SSIC_PORT_CFG2_OFFSET 0x30
25#define PROG_DONE (1 << 30)
26#define SSIC_PORT_UNUSED (1 << 31)
27#define SPARSE_DISABLE_BIT 17
28#define SPARSE_CNTL_ENABLE 0xC12C
29
30/* Device for a quirk */
31#define PCI_VENDOR_ID_FRESCO_LOGIC 0x1b73
32#define PCI_DEVICE_ID_FRESCO_LOGIC_PDK 0x1000
33#define PCI_DEVICE_ID_FRESCO_LOGIC_FL1009 0x1009
34#define PCI_DEVICE_ID_FRESCO_LOGIC_FL1100 0x1100
35#define PCI_DEVICE_ID_FRESCO_LOGIC_FL1400 0x1400
36
37#define PCI_VENDOR_ID_ETRON 0x1b6f
38#define PCI_DEVICE_ID_ETRON_EJ168 0x7023
39#define PCI_DEVICE_ID_ETRON_EJ188 0x7052
40
41#define PCI_DEVICE_ID_VIA_VL805 0x3483
42
43#define PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI 0x8c31
44#define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI 0x9c31
45#define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_XHCI 0x9cb1
46#define PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI 0x22b5
47#define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI 0xa12f
48#define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI 0x9d2f
49#define PCI_DEVICE_ID_INTEL_BROXTON_M_XHCI 0x0aa8
50#define PCI_DEVICE_ID_INTEL_BROXTON_B_XHCI 0x1aa8
51#define PCI_DEVICE_ID_INTEL_APOLLO_LAKE_XHCI 0x5aa8
52#define PCI_DEVICE_ID_INTEL_DENVERTON_XHCI 0x19d0
53#define PCI_DEVICE_ID_INTEL_ICE_LAKE_XHCI 0x8a13
54#define PCI_DEVICE_ID_INTEL_TIGER_LAKE_XHCI 0x9a13
55#define PCI_DEVICE_ID_INTEL_TIGER_LAKE_PCH_XHCI 0xa0ed
56#define PCI_DEVICE_ID_INTEL_COMET_LAKE_XHCI 0xa3af
57#define PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI 0x51ed
58#define PCI_DEVICE_ID_INTEL_ALDER_LAKE_N_PCH_XHCI 0x54ed
59
60#define PCI_VENDOR_ID_PHYTIUM 0x1db7
61#define PCI_DEVICE_ID_PHYTIUM_XHCI 0xdc27
62
63/* Thunderbolt */
64#define PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_XHCI 0x1138
65#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_XHCI 0x15b5
66#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_XHCI 0x15b6
67#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_XHCI 0x15c1
68#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_XHCI 0x15db
69#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_XHCI 0x15d4
70#define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_XHCI 0x15e9
71#define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_XHCI 0x15ec
72#define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_XHCI 0x15f0
73
74#define PCI_DEVICE_ID_AMD_ARIEL_TYPEC_XHCI 0x13ed
75#define PCI_DEVICE_ID_AMD_ARIEL_TYPEA_XHCI 0x13ee
76#define PCI_DEVICE_ID_AMD_STARSHIP_XHCI 0x148c
77#define PCI_DEVICE_ID_AMD_FIREFLIGHT_15D4_XHCI 0x15d4
78#define PCI_DEVICE_ID_AMD_FIREFLIGHT_15D5_XHCI 0x15d5
79#define PCI_DEVICE_ID_AMD_RAVEN_15E0_XHCI 0x15e0
80#define PCI_DEVICE_ID_AMD_RAVEN_15E1_XHCI 0x15e1
81#define PCI_DEVICE_ID_AMD_RAVEN2_XHCI 0x15e5
82#define PCI_DEVICE_ID_AMD_RENOIR_XHCI 0x1639
83#define PCI_DEVICE_ID_AMD_PROMONTORYA_4 0x43b9
84#define PCI_DEVICE_ID_AMD_PROMONTORYA_3 0x43ba
85#define PCI_DEVICE_ID_AMD_PROMONTORYA_2 0x43bb
86#define PCI_DEVICE_ID_AMD_PROMONTORYA_1 0x43bc
87
88#define PCI_DEVICE_ID_ATI_NAVI10_7316_XHCI 0x7316
89
90#define PCI_DEVICE_ID_ASMEDIA_1042_XHCI 0x1042
91#define PCI_DEVICE_ID_ASMEDIA_1042A_XHCI 0x1142
92#define PCI_DEVICE_ID_ASMEDIA_1142_XHCI 0x1242
93#define PCI_DEVICE_ID_ASMEDIA_2142_XHCI 0x2142
94#define PCI_DEVICE_ID_ASMEDIA_3042_XHCI 0x3042
95#define PCI_DEVICE_ID_ASMEDIA_3242_XHCI 0x3242
96
97static const char hcd_name[] = "xhci_hcd";
98
99static struct hc_driver __read_mostly xhci_pci_hc_driver;
100
101static int xhci_pci_setup(struct usb_hcd *hcd);
102static int xhci_pci_run(struct usb_hcd *hcd);
103static int xhci_pci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
104 struct usb_tt *tt, gfp_t mem_flags);
105
106static const struct xhci_driver_overrides xhci_pci_overrides __initconst = {
107 .reset = xhci_pci_setup,
108 .start = xhci_pci_run,
109 .update_hub_device = xhci_pci_update_hub_device,
110};
111
112/*
113 * Primary Legacy and MSI IRQ are synced in suspend_common().
114 * All MSI-X IRQs and secondary MSI IRQs should be synced here.
115 */
116static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
117{
118 struct usb_hcd *hcd = xhci_to_hcd(xhci);
119
120 if (hcd->msix_enabled) {
121 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
122
123 /* for now, the driver only supports one primary interrupter */
124 synchronize_irq(irq: pci_irq_vector(dev: pdev, nr: 0));
125 }
126}
127
128/* Legacy IRQ is freed by usb_remove_hcd() or usb_hcd_pci_shutdown() */
129static void xhci_cleanup_msix(struct xhci_hcd *xhci)
130{
131 struct usb_hcd *hcd = xhci_to_hcd(xhci);
132 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
133
134 if (hcd->irq > 0)
135 return;
136
137 free_irq(pci_irq_vector(dev: pdev, nr: 0), xhci_to_hcd(xhci));
138 pci_free_irq_vectors(dev: pdev);
139 hcd->msix_enabled = 0;
140}
141
142/* Try enabling MSI-X with MSI and legacy IRQ as fallback */
143static int xhci_try_enable_msi(struct usb_hcd *hcd)
144{
145 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
146 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
147 int ret;
148
149 /*
150 * Some Fresco Logic host controllers advertise MSI, but fail to
151 * generate interrupts. Don't even try to enable MSI.
152 */
153 if (xhci->quirks & XHCI_BROKEN_MSI)
154 goto legacy_irq;
155
156 /* unregister the legacy interrupt */
157 if (hcd->irq)
158 free_irq(hcd->irq, hcd);
159 hcd->irq = 0;
160
161 /*
162 * Calculate number of MSI/MSI-X vectors supported.
163 * - max_interrupters: the max number of interrupts requested, capped to xhci HCSPARAMS1.
164 * - num_online_cpus: one vector per CPUs core, with at least one overall.
165 */
166 xhci->nvecs = min(num_online_cpus() + 1, xhci->max_interrupters);
167
168 /* TODO: Check with MSI Soc for sysdev */
169 xhci->nvecs = pci_alloc_irq_vectors(dev: pdev, min_vecs: 1, max_vecs: xhci->nvecs,
170 PCI_IRQ_MSIX | PCI_IRQ_MSI);
171 if (xhci->nvecs < 0) {
172 xhci_dbg_trace(xhci, trace: trace_xhci_dbg_init,
173 fmt: "failed to allocate IRQ vectors");
174 goto legacy_irq;
175 }
176
177 ret = request_irq(irq: pci_irq_vector(dev: pdev, nr: 0), handler: xhci_msi_irq, flags: 0, name: "xhci_hcd",
178 dev: xhci_to_hcd(xhci));
179 if (ret)
180 goto free_irq_vectors;
181
182 hcd->msi_enabled = 1;
183 hcd->msix_enabled = pdev->msix_enabled;
184 return 0;
185
186free_irq_vectors:
187 xhci_dbg_trace(xhci, trace: trace_xhci_dbg_init, fmt: "disable %s interrupt",
188 pdev->msix_enabled ? "MSI-X" : "MSI");
189 pci_free_irq_vectors(dev: pdev);
190
191legacy_irq:
192 if (!pdev->irq) {
193 xhci_err(xhci, "No msi-x/msi found and no IRQ in BIOS\n");
194 return -EINVAL;
195 }
196
197 if (!strlen(hcd->irq_descr))
198 snprintf(buf: hcd->irq_descr, size: sizeof(hcd->irq_descr), fmt: "%s:usb%d",
199 hcd->driver->description, hcd->self.busnum);
200
201 /* fall back to legacy interrupt */
202 ret = request_irq(irq: pdev->irq, handler: &usb_hcd_irq, IRQF_SHARED, name: hcd->irq_descr, dev: hcd);
203 if (ret) {
204 xhci_err(xhci, "request interrupt %d failed\n", pdev->irq);
205 return ret;
206 }
207 hcd->irq = pdev->irq;
208 return 0;
209}
210
211static int xhci_pci_run(struct usb_hcd *hcd)
212{
213 int ret;
214
215 if (usb_hcd_is_primary_hcd(hcd)) {
216 ret = xhci_try_enable_msi(hcd);
217 if (ret)
218 return ret;
219 }
220
221 return xhci_run(hcd);
222}
223
224static void xhci_pci_stop(struct usb_hcd *hcd)
225{
226 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
227
228 xhci_stop(hcd);
229
230 if (usb_hcd_is_primary_hcd(hcd))
231 xhci_cleanup_msix(xhci);
232}
233
234/* called after powerup, by probe or system-pm "wakeup" */
235static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
236{
237 /*
238 * TODO: Implement finding debug ports later.
239 * TODO: see if there are any quirks that need to be added to handle
240 * new extended capabilities.
241 */
242
243 /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
244 if (!pci_set_mwi(dev: pdev))
245 xhci_dbg(xhci, "MWI active\n");
246
247 xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
248 return 0;
249}
250
251static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
252{
253 struct pci_dev *pdev = to_pci_dev(dev);
254
255 /* Look for vendor-specific quirks */
256 if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
257 (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK ||
258 pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1400)) {
259 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
260 pdev->revision == 0x0) {
261 xhci->quirks |= XHCI_RESET_EP_QUIRK;
262 xhci_dbg_trace(xhci, trace: trace_xhci_dbg_quirks,
263 fmt: "XHCI_RESET_EP_QUIRK for this evaluation HW is deprecated");
264 }
265 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
266 pdev->revision == 0x4) {
267 xhci->quirks |= XHCI_SLOW_SUSPEND;
268 xhci_dbg_trace(xhci, trace: trace_xhci_dbg_quirks,
269 fmt: "QUIRK: Fresco Logic xHC revision %u"
270 "must be suspended extra slowly",
271 pdev->revision);
272 }
273 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK)
274 xhci->quirks |= XHCI_BROKEN_STREAMS;
275 /* Fresco Logic confirms: all revisions of this chip do not
276 * support MSI, even though some of them claim to in their PCI
277 * capabilities.
278 */
279 xhci->quirks |= XHCI_BROKEN_MSI;
280 xhci_dbg_trace(xhci, trace: trace_xhci_dbg_quirks,
281 fmt: "QUIRK: Fresco Logic revision %u "
282 "has broken MSI implementation",
283 pdev->revision);
284 }
285
286 if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
287 pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1009)
288 xhci->quirks |= XHCI_BROKEN_STREAMS;
289
290 if (pdev->vendor == PCI_VENDOR_ID_NEC)
291 xhci->quirks |= XHCI_NEC_HOST;
292
293 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
294 (pdev->device == PCI_DEVICE_ID_AMD_ARIEL_TYPEC_XHCI ||
295 pdev->device == PCI_DEVICE_ID_AMD_ARIEL_TYPEA_XHCI ||
296 pdev->device == PCI_DEVICE_ID_AMD_STARSHIP_XHCI ||
297 pdev->device == PCI_DEVICE_ID_AMD_FIREFLIGHT_15D4_XHCI ||
298 pdev->device == PCI_DEVICE_ID_AMD_FIREFLIGHT_15D5_XHCI ||
299 pdev->device == PCI_DEVICE_ID_AMD_RAVEN_15E0_XHCI ||
300 pdev->device == PCI_DEVICE_ID_AMD_RAVEN_15E1_XHCI ||
301 pdev->device == PCI_DEVICE_ID_AMD_RAVEN2_XHCI))
302 xhci->quirks |= XHCI_LIMIT_ENDPOINT_INTERVAL_9;
303
304 if (pdev->vendor == PCI_VENDOR_ID_ATI &&
305 pdev->device == PCI_DEVICE_ID_ATI_NAVI10_7316_XHCI)
306 xhci->quirks |= XHCI_LIMIT_ENDPOINT_INTERVAL_9;
307
308 if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
309 xhci->quirks |= XHCI_AMD_0x96_HOST;
310
311 /* AMD PLL quirk */
312 if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_quirk_pll_check())
313 xhci->quirks |= XHCI_AMD_PLL_FIX;
314
315 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
316 (pdev->device == 0x145c ||
317 pdev->device == 0x15e0 ||
318 pdev->device == 0x15e1 ||
319 pdev->device == 0x43bb))
320 xhci->quirks |= XHCI_SUSPEND_DELAY;
321
322 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
323 (pdev->device == 0x15e0 || pdev->device == 0x15e1))
324 xhci->quirks |= XHCI_SNPS_BROKEN_SUSPEND;
325
326 if (pdev->vendor == PCI_VENDOR_ID_AMD && pdev->device == 0x15e5) {
327 xhci->quirks |= XHCI_DISABLE_SPARSE;
328 xhci->quirks |= XHCI_RESET_ON_RESUME;
329 }
330
331 if (pdev->vendor == PCI_VENDOR_ID_AMD && pdev->device == 0x43f7)
332 xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
333
334 if ((pdev->vendor == PCI_VENDOR_ID_AMD) &&
335 ((pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_4) ||
336 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_3) ||
337 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_2) ||
338 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_1)))
339 xhci->quirks |= XHCI_U2_DISABLE_WAKE;
340
341 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
342 pdev->device == PCI_DEVICE_ID_AMD_RENOIR_XHCI)
343 xhci->quirks |= XHCI_BROKEN_D3COLD_S2I;
344
345 if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
346 xhci->quirks |= XHCI_LPM_SUPPORT;
347 xhci->quirks |= XHCI_INTEL_HOST;
348 xhci->quirks |= XHCI_AVOID_BEI;
349 }
350 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
351 pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
352 xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
353 xhci->limit_active_eps = 64;
354 xhci->quirks |= XHCI_SW_BW_CHECKING;
355 /*
356 * PPT desktop boards DH77EB and DH77DF will power back on after
357 * a few seconds of being shutdown. The fix for this is to
358 * switch the ports from xHCI to EHCI on shutdown. We can't use
359 * DMI information to find those particular boards (since each
360 * vendor will change the board name), so we have to key off all
361 * PPT chipsets.
362 */
363 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
364 }
365 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
366 (pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI ||
367 pdev->device == PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_XHCI)) {
368 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
369 xhci->quirks |= XHCI_SPURIOUS_WAKEUP;
370 }
371 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
372 (pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
373 pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI ||
374 pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
375 pdev->device == PCI_DEVICE_ID_INTEL_BROXTON_M_XHCI ||
376 pdev->device == PCI_DEVICE_ID_INTEL_BROXTON_B_XHCI ||
377 pdev->device == PCI_DEVICE_ID_INTEL_APOLLO_LAKE_XHCI ||
378 pdev->device == PCI_DEVICE_ID_INTEL_DENVERTON_XHCI ||
379 pdev->device == PCI_DEVICE_ID_INTEL_COMET_LAKE_XHCI)) {
380 xhci->quirks |= XHCI_PME_STUCK_QUIRK;
381 }
382 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
383 pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI)
384 xhci->quirks |= XHCI_SSIC_PORT_UNUSED;
385 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
386 (pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
387 pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
388 pdev->device == PCI_DEVICE_ID_INTEL_APOLLO_LAKE_XHCI))
389 xhci->quirks |= XHCI_INTEL_USB_ROLE_SW;
390 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
391 (pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
392 pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
393 pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI ||
394 pdev->device == PCI_DEVICE_ID_INTEL_APOLLO_LAKE_XHCI ||
395 pdev->device == PCI_DEVICE_ID_INTEL_DENVERTON_XHCI))
396 xhci->quirks |= XHCI_MISSING_CAS;
397
398 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
399 (pdev->device == PCI_DEVICE_ID_INTEL_TIGER_LAKE_PCH_XHCI ||
400 pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI ||
401 pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_N_PCH_XHCI))
402 xhci->quirks |= XHCI_RESET_TO_DEFAULT;
403
404 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
405 (pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_XHCI ||
406 pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_XHCI ||
407 pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_XHCI ||
408 pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_XHCI ||
409 pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_XHCI ||
410 pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_XHCI ||
411 pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_XHCI ||
412 pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_XHCI ||
413 pdev->device == PCI_DEVICE_ID_INTEL_ICE_LAKE_XHCI ||
414 pdev->device == PCI_DEVICE_ID_INTEL_TIGER_LAKE_XHCI ||
415 pdev->device == PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_XHCI))
416 xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
417
418 if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
419 (pdev->device == PCI_DEVICE_ID_ETRON_EJ168 ||
420 pdev->device == PCI_DEVICE_ID_ETRON_EJ188)) {
421 xhci->quirks |= XHCI_ETRON_HOST;
422 xhci->quirks |= XHCI_RESET_ON_RESUME;
423 xhci->quirks |= XHCI_BROKEN_STREAMS;
424 xhci->quirks |= XHCI_NO_SOFT_RETRY;
425 }
426
427 if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
428 pdev->device == 0x0014) {
429 xhci->quirks |= XHCI_ZERO_64B_REGS;
430 }
431 if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
432 pdev->device == 0x0015) {
433 xhci->quirks |= XHCI_RESET_ON_RESUME;
434 xhci->quirks |= XHCI_ZERO_64B_REGS;
435 }
436 if (pdev->vendor == PCI_VENDOR_ID_VIA)
437 xhci->quirks |= XHCI_RESET_ON_RESUME;
438
439 if (pdev->vendor == PCI_VENDOR_ID_PHYTIUM &&
440 pdev->device == PCI_DEVICE_ID_PHYTIUM_XHCI)
441 xhci->quirks |= XHCI_RESET_ON_RESUME;
442
443 /* See https://bugzilla.kernel.org/show_bug.cgi?id=79511 */
444 if (pdev->vendor == PCI_VENDOR_ID_VIA &&
445 pdev->device == 0x3432)
446 xhci->quirks |= XHCI_BROKEN_STREAMS;
447
448 if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == PCI_DEVICE_ID_VIA_VL805) {
449 xhci->quirks |= XHCI_LPM_SUPPORT;
450 xhci->quirks |= XHCI_TRB_OVERFETCH;
451 }
452
453 if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
454 pdev->device == PCI_DEVICE_ID_ASMEDIA_1042_XHCI) {
455 /*
456 * try to tame the ASMedia 1042 controller which reports 0.96
457 * but appears to behave more like 1.0
458 */
459 xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
460 xhci->quirks |= XHCI_BROKEN_STREAMS;
461 }
462 if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
463 pdev->device == PCI_DEVICE_ID_ASMEDIA_1042A_XHCI) {
464 xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
465 }
466 if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
467 (pdev->device == PCI_DEVICE_ID_ASMEDIA_1142_XHCI ||
468 pdev->device == PCI_DEVICE_ID_ASMEDIA_2142_XHCI ||
469 pdev->device == PCI_DEVICE_ID_ASMEDIA_3242_XHCI))
470 xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
471
472 if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
473 pdev->device == PCI_DEVICE_ID_ASMEDIA_1042A_XHCI)
474 xhci->quirks |= XHCI_ASMEDIA_MODIFY_FLOWCONTROL;
475
476 if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
477 pdev->device == PCI_DEVICE_ID_ASMEDIA_3042_XHCI)
478 xhci->quirks |= XHCI_RESET_ON_RESUME;
479
480 if (pdev->vendor == PCI_VENDOR_ID_TI && pdev->device == 0x8241)
481 xhci->quirks |= XHCI_LIMIT_ENDPOINT_INTERVAL_7;
482
483 if ((pdev->vendor == PCI_VENDOR_ID_BROADCOM ||
484 pdev->vendor == PCI_VENDOR_ID_CAVIUM) &&
485 pdev->device == 0x9026)
486 xhci->quirks |= XHCI_RESET_PLL_ON_DISCONNECT;
487
488 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
489 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_2 ||
490 pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_4))
491 xhci->quirks |= XHCI_NO_SOFT_RETRY;
492
493 if (pdev->vendor == PCI_VENDOR_ID_ZHAOXIN) {
494 xhci->quirks |= XHCI_ZHAOXIN_HOST;
495 xhci->quirks |= XHCI_LPM_SUPPORT;
496
497 if (pdev->device == 0x9202) {
498 xhci->quirks |= XHCI_RESET_ON_RESUME;
499 xhci->quirks |= XHCI_TRB_OVERFETCH;
500 }
501
502 if (pdev->device == 0x9203)
503 xhci->quirks |= XHCI_TRB_OVERFETCH;
504 }
505
506 if (pdev->vendor == PCI_VENDOR_ID_CDNS &&
507 pdev->device == PCI_DEVICE_ID_CDNS_USBSSP)
508 xhci->quirks |= XHCI_CDNS_SCTX_QUIRK;
509
510 /* xHC spec requires PCI devices to support D3hot and D3cold */
511 if (xhci->hci_version >= 0x120)
512 xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
513
514 if (xhci->quirks & XHCI_RESET_ON_RESUME)
515 xhci_dbg_trace(xhci, trace: trace_xhci_dbg_quirks,
516 fmt: "QUIRK: Resetting on resume");
517}
518
519#ifdef CONFIG_ACPI
520static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev)
521{
522 static const guid_t intel_dsm_guid =
523 GUID_INIT(0xac340cb7, 0xe901, 0x45bf,
524 0xb7, 0xe6, 0x2b, 0x34, 0xec, 0x93, 0x1e, 0x23);
525 union acpi_object *obj;
526
527 obj = acpi_evaluate_dsm(ACPI_HANDLE(&dev->dev), guid: &intel_dsm_guid, rev: 3, func: 1,
528 NULL);
529 ACPI_FREE(obj);
530}
531
532static void xhci_find_lpm_incapable_ports(struct usb_hcd *hcd, struct usb_device *hdev)
533{
534 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
535 struct xhci_hub *rhub = &xhci->usb3_rhub;
536 int ret;
537 int i;
538
539 /* This is not the usb3 roothub we are looking for */
540 if (hcd != rhub->hcd)
541 return;
542
543 if (hdev->maxchild > rhub->num_ports) {
544 dev_err(&hdev->dev, "USB3 roothub port number mismatch\n");
545 return;
546 }
547
548 for (i = 0; i < hdev->maxchild; i++) {
549 ret = usb_acpi_port_lpm_incapable(hdev, index: i);
550
551 dev_dbg(&hdev->dev, "port-%d disable U1/U2 _DSM: %d\n", i + 1, ret);
552
553 if (ret >= 0) {
554 rhub->ports[i]->lpm_incapable = ret;
555 continue;
556 }
557 }
558}
559
560#else
561static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev) { }
562static void xhci_find_lpm_incapable_ports(struct usb_hcd *hcd, struct usb_device *hdev) { }
563#endif /* CONFIG_ACPI */
564
565/* called during probe() after chip reset completes */
566static int xhci_pci_setup(struct usb_hcd *hcd)
567{
568 struct xhci_hcd *xhci;
569 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
570 int retval;
571 u8 sbrn;
572
573 xhci = hcd_to_xhci(hcd);
574
575 /* imod_interval is the interrupt moderation value in nanoseconds. */
576 xhci->imod_interval = 40000;
577
578 retval = xhci_gen_setup(hcd, get_quirks: xhci_pci_quirks);
579 if (retval)
580 return retval;
581
582 if (!usb_hcd_is_primary_hcd(hcd))
583 return 0;
584
585 xhci->allow_single_roothub = 1;
586
587 if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
588 xhci_pme_acpi_rtd3_enable(dev: pdev);
589
590 pci_read_config_byte(dev: pdev, XHCI_SBRN_OFFSET, val: &sbrn);
591 xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int)sbrn);
592
593 /* Find any debug ports */
594 return xhci_pci_reinit(xhci, pdev);
595}
596
597static int xhci_pci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
598 struct usb_tt *tt, gfp_t mem_flags)
599{
600 /* Check if acpi claims some USB3 roothub ports are lpm incapable */
601 if (!hdev->parent)
602 xhci_find_lpm_incapable_ports(hcd, hdev);
603
604 return xhci_update_hub_device(hcd, hdev, tt, mem_flags);
605}
606
607/*
608 * We need to register our own PCI probe function (instead of the USB core's
609 * function) in order to create a second roothub under xHCI.
610 */
611int xhci_pci_common_probe(struct pci_dev *dev, const struct pci_device_id *id)
612{
613 int retval;
614 struct xhci_hcd *xhci;
615 struct usb_hcd *hcd, *usb3_hcd;
616 struct reset_control *reset;
617
618 reset = devm_reset_control_get_optional_exclusive(dev: &dev->dev, NULL);
619 if (IS_ERR(ptr: reset))
620 return PTR_ERR(ptr: reset);
621 reset_control_reset(rstc: reset);
622
623 /* Prevent runtime suspending between USB-2 and USB-3 initialization */
624 pm_runtime_get_noresume(dev: &dev->dev);
625
626 /* Register the USB 2.0 roothub.
627 * FIXME: USB core must know to register the USB 2.0 roothub first.
628 * This is sort of silly, because we could just set the HCD driver flags
629 * to say USB 2.0, but I'm not sure what the implications would be in
630 * the other parts of the HCD code.
631 */
632 retval = usb_hcd_pci_probe(dev, driver: &xhci_pci_hc_driver);
633
634 if (retval)
635 goto put_runtime_pm;
636
637 /* USB 2.0 roothub is stored in the PCI device now. */
638 hcd = dev_get_drvdata(dev: &dev->dev);
639 xhci = hcd_to_xhci(hcd);
640 xhci->reset = reset;
641
642 if (!xhci_has_one_roothub(xhci)) {
643 xhci->shared_hcd = usb_create_shared_hcd(driver: &xhci_pci_hc_driver, dev: &dev->dev,
644 bus_name: pci_name(pdev: dev), shared_hcd: hcd);
645 if (!xhci->shared_hcd) {
646 retval = -ENOMEM;
647 goto dealloc_usb2_hcd;
648 }
649
650 retval = xhci_ext_cap_init(xhci);
651 if (retval)
652 goto put_usb3_hcd;
653
654 retval = usb_add_hcd(hcd: xhci->shared_hcd, irqnum: dev->irq, IRQF_SHARED);
655 if (retval)
656 goto put_usb3_hcd;
657 } else {
658 retval = xhci_ext_cap_init(xhci);
659 if (retval)
660 goto dealloc_usb2_hcd;
661 }
662
663 usb3_hcd = xhci_get_usb3_hcd(xhci);
664 if (usb3_hcd && !(xhci->quirks & XHCI_BROKEN_STREAMS) && HCC_MAX_PSA(xhci->hcc_params) >= 4)
665 usb3_hcd->can_do_streams = 1;
666
667 /* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
668 pm_runtime_put_noidle(dev: &dev->dev);
669
670 if (pci_choose_state(dev, PMSG_SUSPEND) == PCI_D0)
671 pm_runtime_get(dev: &dev->dev);
672 else if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
673 pm_runtime_allow(dev: &dev->dev);
674
675 dma_set_max_seg_size(dev: &dev->dev, UINT_MAX);
676
677 if (device_property_read_bool(dev: &dev->dev, propname: "ti,pwron-active-high"))
678 pci_clear_and_set_config_dword(dev, pos: 0xE0, clear: 0, set: 1 << 22);
679
680 return 0;
681
682put_usb3_hcd:
683 usb_put_hcd(hcd: xhci->shared_hcd);
684dealloc_usb2_hcd:
685 usb_hcd_pci_remove(dev);
686put_runtime_pm:
687 pm_runtime_put_noidle(dev: &dev->dev);
688 return retval;
689}
690EXPORT_SYMBOL_NS_GPL(xhci_pci_common_probe, "xhci");
691
692/* handled by xhci-pci-renesas if enabled */
693static const struct pci_device_id pci_ids_renesas[] = {
694 { PCI_DEVICE(PCI_VENDOR_ID_RENESAS, 0x0014) },
695 { PCI_DEVICE(PCI_VENDOR_ID_RENESAS, 0x0015) },
696 { /* end: all zeroes */ }
697};
698
699static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
700{
701 if (IS_ENABLED(CONFIG_USB_XHCI_PCI_RENESAS) &&
702 pci_match_id(ids: pci_ids_renesas, dev))
703 return -ENODEV;
704
705 return xhci_pci_common_probe(dev, id);
706}
707
708void xhci_pci_remove(struct pci_dev *dev)
709{
710 struct xhci_hcd *xhci;
711 bool set_power_d3;
712
713 xhci = hcd_to_xhci(hcd: pci_get_drvdata(pdev: dev));
714 set_power_d3 = xhci->quirks & XHCI_SPURIOUS_WAKEUP;
715
716 xhci->xhc_state |= XHCI_STATE_REMOVING;
717
718 if (pci_choose_state(dev, PMSG_SUSPEND) == PCI_D0)
719 pm_runtime_put(dev: &dev->dev);
720 else if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
721 pm_runtime_forbid(dev: &dev->dev);
722
723 if (xhci->shared_hcd) {
724 usb_remove_hcd(hcd: xhci->shared_hcd);
725 usb_put_hcd(hcd: xhci->shared_hcd);
726 xhci->shared_hcd = NULL;
727 }
728
729 usb_hcd_pci_remove(dev);
730
731 /* Workaround for spurious wakeups at shutdown with HSW */
732 if (set_power_d3)
733 pci_set_power_state(dev, PCI_D3hot);
734}
735EXPORT_SYMBOL_NS_GPL(xhci_pci_remove, "xhci");
736
737/*
738 * In some Intel xHCI controllers, in order to get D3 working,
739 * through a vendor specific SSIC CONFIG register at offset 0x883c,
740 * SSIC PORT need to be marked as "unused" before putting xHCI
741 * into D3. After D3 exit, the SSIC port need to be marked as "used".
742 * Without this change, xHCI might not enter D3 state.
743 */
744static void xhci_ssic_port_unused_quirk(struct usb_hcd *hcd, bool suspend)
745{
746 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
747 u32 val;
748 void __iomem *reg;
749 int i;
750
751 for (i = 0; i < SSIC_PORT_NUM; i++) {
752 reg = (void __iomem *) xhci->cap_regs +
753 SSIC_PORT_CFG2 +
754 i * SSIC_PORT_CFG2_OFFSET;
755
756 /* Notify SSIC that SSIC profile programming is not done. */
757 val = readl(addr: reg) & ~PROG_DONE;
758 writel(val, addr: reg);
759
760 /* Mark SSIC port as unused(suspend) or used(resume) */
761 val = readl(addr: reg);
762 if (suspend)
763 val |= SSIC_PORT_UNUSED;
764 else
765 val &= ~SSIC_PORT_UNUSED;
766 writel(val, addr: reg);
767
768 /* Notify SSIC that SSIC profile programming is done */
769 val = readl(addr: reg) | PROG_DONE;
770 writel(val, addr: reg);
771 readl(addr: reg);
772 }
773}
774
775/*
776 * Make sure PME works on some Intel xHCI controllers by writing 1 to clear
777 * the Internal PME flag bit in vendor specific PMCTRL register at offset 0x80a4
778 */
779static void xhci_pme_quirk(struct usb_hcd *hcd)
780{
781 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
782 void __iomem *reg;
783 u32 val;
784
785 reg = (void __iomem *) xhci->cap_regs + 0x80a4;
786 val = readl(addr: reg);
787 writel(val: val | BIT(28), addr: reg);
788 readl(addr: reg);
789}
790
791static void xhci_sparse_control_quirk(struct usb_hcd *hcd)
792{
793 u32 reg;
794
795 reg = readl(addr: hcd->regs + SPARSE_CNTL_ENABLE);
796 reg &= ~BIT(SPARSE_DISABLE_BIT);
797 writel(val: reg, addr: hcd->regs + SPARSE_CNTL_ENABLE);
798}
799
800static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
801{
802 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
803 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
804 int ret;
805
806 /*
807 * Systems with the TI redriver that loses port status change events
808 * need to have the registers polled during D3, so avoid D3cold.
809 */
810 if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
811 pci_d3cold_disable(dev: pdev);
812
813#ifdef CONFIG_SUSPEND
814 /* d3cold is broken, but only when s2idle is used */
815 if (pm_suspend_target_state == PM_SUSPEND_TO_IDLE &&
816 xhci->quirks & (XHCI_BROKEN_D3COLD_S2I))
817 pci_d3cold_disable(dev: pdev);
818#endif
819
820 if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
821 xhci_pme_quirk(hcd);
822
823 if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
824 xhci_ssic_port_unused_quirk(hcd, suspend: true);
825
826 if (xhci->quirks & XHCI_DISABLE_SPARSE)
827 xhci_sparse_control_quirk(hcd);
828
829 ret = xhci_suspend(xhci, do_wakeup);
830
831 /* synchronize irq when using MSI-X */
832 xhci_msix_sync_irqs(xhci);
833
834 if (ret && (xhci->quirks & XHCI_SSIC_PORT_UNUSED))
835 xhci_ssic_port_unused_quirk(hcd, suspend: false);
836
837 return ret;
838}
839
840static int xhci_pci_resume(struct usb_hcd *hcd, pm_message_t msg)
841{
842 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
843 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
844 bool power_lost = msg.event == PM_EVENT_RESTORE;
845 bool is_auto_resume = msg.event == PM_EVENT_AUTO_RESUME;
846
847 reset_control_reset(rstc: xhci->reset);
848
849 /* The BIOS on systems with the Intel Panther Point chipset may or may
850 * not support xHCI natively. That means that during system resume, it
851 * may switch the ports back to EHCI so that users can use their
852 * keyboard to select a kernel from GRUB after resume from hibernate.
853 *
854 * The BIOS is supposed to remember whether the OS had xHCI ports
855 * enabled before resume, and switch the ports back to xHCI when the
856 * BIOS/OS semaphore is written, but we all know we can't trust BIOS
857 * writers.
858 *
859 * Unconditionally switch the ports back to xHCI after a system resume.
860 * It should not matter whether the EHCI or xHCI controller is
861 * resumed first. It's enough to do the switchover in xHCI because
862 * USB core won't notice anything as the hub driver doesn't start
863 * running again until after all the devices (including both EHCI and
864 * xHCI host controllers) have been resumed.
865 */
866
867 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
868 usb_enable_intel_xhci_ports(xhci_pdev: pdev);
869
870 if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
871 xhci_ssic_port_unused_quirk(hcd, suspend: false);
872
873 if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
874 xhci_pme_quirk(hcd);
875
876 return xhci_resume(xhci, power_lost, is_auto_resume);
877}
878
879static int xhci_pci_poweroff_late(struct usb_hcd *hcd, bool do_wakeup)
880{
881 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
882 struct xhci_port *port;
883 struct usb_device *udev;
884 u32 portsc;
885 int i;
886
887 /*
888 * Systems with XHCI_RESET_TO_DEFAULT quirk have boot firmware that
889 * cause significant boot delay if usb ports are in suspended U3 state
890 * during boot. Some USB devices survive in U3 state over S4 hibernate
891 *
892 * Disable ports that are in U3 if remote wake is not enabled for either
893 * host controller or connected device
894 */
895
896 if (!(xhci->quirks & XHCI_RESET_TO_DEFAULT))
897 return 0;
898
899 for (i = 0; i < xhci->max_ports; i++) {
900 port = &xhci->hw_ports[i];
901 portsc = xhci_portsc_readl(port);
902
903 if ((portsc & PORT_PLS_MASK) != XDEV_U3)
904 continue;
905
906 if (!port->slot_id || !xhci->devs[port->slot_id]) {
907 xhci_err(xhci, "No dev for slot_id %d for port %d-%d in U3\n",
908 port->slot_id, port->rhub->hcd->self.busnum,
909 port->hcd_portnum + 1);
910 continue;
911 }
912
913 udev = xhci->devs[port->slot_id]->udev;
914
915 /* if wakeup is enabled then don't disable the port */
916 if (udev->do_remote_wakeup && do_wakeup)
917 continue;
918
919 xhci_dbg(xhci, "port %d-%d in U3 without wakeup, disable it\n",
920 port->rhub->hcd->self.busnum, port->hcd_portnum + 1);
921 portsc = xhci_port_state_to_neutral(state: portsc);
922 xhci_portsc_writel(port, val: portsc | PORT_PE);
923 }
924
925 return 0;
926}
927
928static void xhci_pci_shutdown(struct usb_hcd *hcd)
929{
930 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
931 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
932
933 xhci_shutdown(hcd);
934 xhci_cleanup_msix(xhci);
935
936 /* Yet another workaround for spurious wakeups at shutdown with HSW */
937 if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
938 pci_set_power_state(dev: pdev, PCI_D3hot);
939}
940
941/*-------------------------------------------------------------------------*/
942
943/* PCI driver selection metadata; PCI hotplugging uses this */
944static const struct pci_device_id pci_ids[] = {
945 /* handle any USB 3.0 xHCI controller */
946 { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
947 },
948 { /* end: all zeroes */ }
949};
950MODULE_DEVICE_TABLE(pci, pci_ids);
951
952/* pci driver glue; this is a "new style" PCI driver module */
953static struct pci_driver xhci_pci_driver = {
954 .name = hcd_name,
955 .id_table = pci_ids,
956
957 .probe = xhci_pci_probe,
958 .remove = xhci_pci_remove,
959 /* suspend and resume implemented later */
960
961 .shutdown = usb_hcd_pci_shutdown,
962 .driver = {
963 .pm = pm_ptr(&usb_hcd_pci_pm_ops),
964 },
965};
966
967static int __init xhci_pci_init(void)
968{
969 xhci_init_driver(drv: &xhci_pci_hc_driver, over: &xhci_pci_overrides);
970 xhci_pci_hc_driver.pci_suspend = pm_ptr(xhci_pci_suspend);
971 xhci_pci_hc_driver.pci_resume = pm_ptr(xhci_pci_resume);
972 xhci_pci_hc_driver.pci_poweroff_late = pm_ptr(xhci_pci_poweroff_late);
973 xhci_pci_hc_driver.shutdown = pm_ptr(xhci_pci_shutdown);
974 xhci_pci_hc_driver.stop = xhci_pci_stop;
975 return pci_register_driver(&xhci_pci_driver);
976}
977module_init(xhci_pci_init);
978
979static void __exit xhci_pci_exit(void)
980{
981 pci_unregister_driver(dev: &xhci_pci_driver);
982}
983module_exit(xhci_pci_exit);
984
985MODULE_DESCRIPTION("xHCI PCI Host Controller Driver");
986MODULE_LICENSE("GPL");
987

source code of linux/drivers/usb/host/xhci-pci.c