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_EJ168 0x7023
39 #define PCI_DEVICE_ID_EJ188 0x7052
40
41 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI 0x8c31
42 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI 0x9c31
43 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_XHCI 0x9cb1
44 #define PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI 0x22b5
45 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI 0xa12f
46 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI 0x9d2f
47 #define PCI_DEVICE_ID_INTEL_BROXTON_M_XHCI 0x0aa8
48 #define PCI_DEVICE_ID_INTEL_BROXTON_B_XHCI 0x1aa8
49 #define PCI_DEVICE_ID_INTEL_APL_XHCI 0x5aa8
50 #define PCI_DEVICE_ID_INTEL_DNV_XHCI 0x19d0
51 #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_XHCI 0x15b5
52 #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_XHCI 0x15b6
53 #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_XHCI 0x15c1
54 #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_XHCI 0x15db
55 #define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_XHCI 0x15d4
56 #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_XHCI 0x15e9
57 #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_XHCI 0x15ec
58 #define PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_XHCI 0x15f0
59 #define PCI_DEVICE_ID_INTEL_ICE_LAKE_XHCI 0x8a13
60 #define PCI_DEVICE_ID_INTEL_CML_XHCI 0xa3af
61 #define PCI_DEVICE_ID_INTEL_TIGER_LAKE_XHCI 0x9a13
62 #define PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_XHCI 0x1138
63 #define PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI 0x51ed
64 #define PCI_DEVICE_ID_INTEL_ALDER_LAKE_N_PCH_XHCI 0x54ed
65
66 #define PCI_DEVICE_ID_AMD_RENOIR_XHCI 0x1639
67 #define PCI_DEVICE_ID_AMD_PROMONTORYA_4 0x43b9
68 #define PCI_DEVICE_ID_AMD_PROMONTORYA_3 0x43ba
69 #define PCI_DEVICE_ID_AMD_PROMONTORYA_2 0x43bb
70 #define PCI_DEVICE_ID_AMD_PROMONTORYA_1 0x43bc
71
72 #define PCI_DEVICE_ID_ASMEDIA_1042_XHCI 0x1042
73 #define PCI_DEVICE_ID_ASMEDIA_1042A_XHCI 0x1142
74 #define PCI_DEVICE_ID_ASMEDIA_1142_XHCI 0x1242
75 #define PCI_DEVICE_ID_ASMEDIA_2142_XHCI 0x2142
76 #define PCI_DEVICE_ID_ASMEDIA_3042_XHCI 0x3042
77 #define PCI_DEVICE_ID_ASMEDIA_3242_XHCI 0x3242
78
79 #define PCI_DEVICE_ID_CADENCE 0x17CD
80 #define PCI_DEVICE_ID_CADENCE_SSP 0x0200
81
82 static const char hcd_name[] = "xhci_hcd";
83
84 static struct hc_driver __read_mostly xhci_pci_hc_driver;
85
86 static int xhci_pci_setup(struct usb_hcd *hcd);
87 static int xhci_pci_run(struct usb_hcd *hcd);
88 static int xhci_pci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
89 struct usb_tt *tt, gfp_t mem_flags);
90
91 static const struct xhci_driver_overrides xhci_pci_overrides __initconst = {
92 .reset = xhci_pci_setup,
93 .start = xhci_pci_run,
94 .update_hub_device = xhci_pci_update_hub_device,
95 };
96
xhci_msix_sync_irqs(struct xhci_hcd * xhci)97 static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
98 {
99 struct usb_hcd *hcd = xhci_to_hcd(xhci);
100
101 if (hcd->msix_enabled) {
102 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
103 int i;
104
105 for (i = 0; i < xhci->msix_count; i++)
106 synchronize_irq(pci_irq_vector(pdev, i));
107 }
108 }
109
110 /* Free any IRQs and disable MSI-X */
xhci_cleanup_msix(struct xhci_hcd * xhci)111 static void xhci_cleanup_msix(struct xhci_hcd *xhci)
112 {
113 struct usb_hcd *hcd = xhci_to_hcd(xhci);
114 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
115
116 /* return if using legacy interrupt */
117 if (hcd->irq > 0)
118 return;
119
120 if (hcd->msix_enabled) {
121 int i;
122
123 for (i = 0; i < xhci->msix_count; i++)
124 free_irq(pci_irq_vector(pdev, i), xhci_to_hcd(xhci));
125 } else {
126 free_irq(pci_irq_vector(pdev, 0), xhci_to_hcd(xhci));
127 }
128
129 pci_free_irq_vectors(pdev);
130 hcd->msix_enabled = 0;
131 }
132
133 /*
134 * Set up MSI
135 */
xhci_setup_msi(struct xhci_hcd * xhci)136 static int xhci_setup_msi(struct xhci_hcd *xhci)
137 {
138 int ret;
139 /*
140 * TODO:Check with MSI Soc for sysdev
141 */
142 struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
143
144 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
145 if (ret < 0) {
146 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
147 "failed to allocate MSI entry");
148 return ret;
149 }
150
151 ret = request_irq(pdev->irq, xhci_msi_irq,
152 0, "xhci_hcd", xhci_to_hcd(xhci));
153 if (ret) {
154 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
155 "disable MSI interrupt");
156 pci_free_irq_vectors(pdev);
157 }
158
159 return ret;
160 }
161
162 /*
163 * Set up MSI-X
164 */
xhci_setup_msix(struct xhci_hcd * xhci)165 static int xhci_setup_msix(struct xhci_hcd *xhci)
166 {
167 int i, ret;
168 struct usb_hcd *hcd = xhci_to_hcd(xhci);
169 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
170
171 /*
172 * calculate number of msi-x vectors supported.
173 * - HCS_MAX_INTRS: the max number of interrupts the host can handle,
174 * with max number of interrupters based on the xhci HCSPARAMS1.
175 * - num_online_cpus: maximum msi-x vectors per CPUs core.
176 * Add additional 1 vector to ensure always available interrupt.
177 */
178 xhci->msix_count = min(num_online_cpus() + 1,
179 HCS_MAX_INTRS(xhci->hcs_params1));
180
181 ret = pci_alloc_irq_vectors(pdev, xhci->msix_count, xhci->msix_count,
182 PCI_IRQ_MSIX);
183 if (ret < 0) {
184 xhci_dbg_trace(xhci, trace_xhci_dbg_init,
185 "Failed to enable MSI-X");
186 return ret;
187 }
188
189 for (i = 0; i < xhci->msix_count; i++) {
190 ret = request_irq(pci_irq_vector(pdev, i), xhci_msi_irq, 0,
191 "xhci_hcd", xhci_to_hcd(xhci));
192 if (ret)
193 goto disable_msix;
194 }
195
196 hcd->msix_enabled = 1;
197 return ret;
198
199 disable_msix:
200 xhci_dbg_trace(xhci, trace_xhci_dbg_init, "disable MSI-X interrupt");
201 while (--i >= 0)
202 free_irq(pci_irq_vector(pdev, i), xhci_to_hcd(xhci));
203 pci_free_irq_vectors(pdev);
204 return ret;
205 }
206
xhci_try_enable_msi(struct usb_hcd * hcd)207 static int xhci_try_enable_msi(struct usb_hcd *hcd)
208 {
209 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
210 struct pci_dev *pdev;
211 int ret;
212
213 pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
214 /*
215 * Some Fresco Logic host controllers advertise MSI, but fail to
216 * generate interrupts. Don't even try to enable MSI.
217 */
218 if (xhci->quirks & XHCI_BROKEN_MSI)
219 goto legacy_irq;
220
221 /* unregister the legacy interrupt */
222 if (hcd->irq)
223 free_irq(hcd->irq, hcd);
224 hcd->irq = 0;
225
226 ret = xhci_setup_msix(xhci);
227 if (ret)
228 /* fall back to msi*/
229 ret = xhci_setup_msi(xhci);
230
231 if (!ret) {
232 hcd->msi_enabled = 1;
233 return 0;
234 }
235
236 if (!pdev->irq) {
237 xhci_err(xhci, "No msi-x/msi found and no IRQ in BIOS\n");
238 return -EINVAL;
239 }
240
241 legacy_irq:
242 if (!strlen(hcd->irq_descr))
243 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
244 hcd->driver->description, hcd->self.busnum);
245
246 /* fall back to legacy interrupt*/
247 ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED,
248 hcd->irq_descr, hcd);
249 if (ret) {
250 xhci_err(xhci, "request interrupt %d failed\n",
251 pdev->irq);
252 return ret;
253 }
254 hcd->irq = pdev->irq;
255 return 0;
256 }
257
xhci_pci_run(struct usb_hcd * hcd)258 static int xhci_pci_run(struct usb_hcd *hcd)
259 {
260 int ret;
261
262 if (usb_hcd_is_primary_hcd(hcd)) {
263 ret = xhci_try_enable_msi(hcd);
264 if (ret)
265 return ret;
266 }
267
268 return xhci_run(hcd);
269 }
270
xhci_pci_stop(struct usb_hcd * hcd)271 static void xhci_pci_stop(struct usb_hcd *hcd)
272 {
273 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
274
275 xhci_stop(hcd);
276
277 if (usb_hcd_is_primary_hcd(hcd))
278 xhci_cleanup_msix(xhci);
279 }
280
281 /* called after powerup, by probe or system-pm "wakeup" */
xhci_pci_reinit(struct xhci_hcd * xhci,struct pci_dev * pdev)282 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
283 {
284 /*
285 * TODO: Implement finding debug ports later.
286 * TODO: see if there are any quirks that need to be added to handle
287 * new extended capabilities.
288 */
289
290 /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
291 if (!pci_set_mwi(pdev))
292 xhci_dbg(xhci, "MWI active\n");
293
294 xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
295 return 0;
296 }
297
xhci_pci_quirks(struct device * dev,struct xhci_hcd * xhci)298 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
299 {
300 struct pci_dev *pdev = to_pci_dev(dev);
301 struct xhci_driver_data *driver_data;
302 const struct pci_device_id *id;
303
304 id = pci_match_id(to_pci_driver(pdev->dev.driver)->id_table, pdev);
305
306 if (id && id->driver_data) {
307 driver_data = (struct xhci_driver_data *)id->driver_data;
308 xhci->quirks |= driver_data->quirks;
309 }
310
311 /* Look for vendor-specific quirks */
312 if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
313 (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK ||
314 pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1400)) {
315 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
316 pdev->revision == 0x0) {
317 xhci->quirks |= XHCI_RESET_EP_QUIRK;
318 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
319 "XHCI_RESET_EP_QUIRK for this evaluation HW is deprecated");
320 }
321 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
322 pdev->revision == 0x4) {
323 xhci->quirks |= XHCI_SLOW_SUSPEND;
324 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
325 "QUIRK: Fresco Logic xHC revision %u"
326 "must be suspended extra slowly",
327 pdev->revision);
328 }
329 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK)
330 xhci->quirks |= XHCI_BROKEN_STREAMS;
331 /* Fresco Logic confirms: all revisions of this chip do not
332 * support MSI, even though some of them claim to in their PCI
333 * capabilities.
334 */
335 xhci->quirks |= XHCI_BROKEN_MSI;
336 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
337 "QUIRK: Fresco Logic revision %u "
338 "has broken MSI implementation",
339 pdev->revision);
340 }
341
342 if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
343 pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1009)
344 xhci->quirks |= XHCI_BROKEN_STREAMS;
345
346 if (pdev->vendor == PCI_VENDOR_ID_NEC)
347 xhci->quirks |= XHCI_NEC_HOST;
348
349 if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
350 xhci->quirks |= XHCI_AMD_0x96_HOST;
351
352 /* AMD PLL quirk */
353 if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_quirk_pll_check())
354 xhci->quirks |= XHCI_AMD_PLL_FIX;
355
356 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
357 (pdev->device == 0x145c ||
358 pdev->device == 0x15e0 ||
359 pdev->device == 0x15e1 ||
360 pdev->device == 0x43bb))
361 xhci->quirks |= XHCI_SUSPEND_DELAY;
362
363 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
364 (pdev->device == 0x15e0 || pdev->device == 0x15e1))
365 xhci->quirks |= XHCI_SNPS_BROKEN_SUSPEND;
366
367 if (pdev->vendor == PCI_VENDOR_ID_AMD && pdev->device == 0x15e5) {
368 xhci->quirks |= XHCI_DISABLE_SPARSE;
369 xhci->quirks |= XHCI_RESET_ON_RESUME;
370 }
371
372 if (pdev->vendor == PCI_VENDOR_ID_AMD && pdev->device == 0x43f7)
373 xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
374
375 if ((pdev->vendor == PCI_VENDOR_ID_AMD) &&
376 ((pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_4) ||
377 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_3) ||
378 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_2) ||
379 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_1)))
380 xhci->quirks |= XHCI_U2_DISABLE_WAKE;
381
382 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
383 pdev->device == PCI_DEVICE_ID_AMD_RENOIR_XHCI)
384 xhci->quirks |= XHCI_BROKEN_D3COLD_S2I;
385
386 if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
387 xhci->quirks |= XHCI_LPM_SUPPORT;
388 xhci->quirks |= XHCI_INTEL_HOST;
389 xhci->quirks |= XHCI_AVOID_BEI;
390 }
391 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
392 pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
393 xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
394 xhci->limit_active_eps = 64;
395 xhci->quirks |= XHCI_SW_BW_CHECKING;
396 /*
397 * PPT desktop boards DH77EB and DH77DF will power back on after
398 * a few seconds of being shutdown. The fix for this is to
399 * switch the ports from xHCI to EHCI on shutdown. We can't use
400 * DMI information to find those particular boards (since each
401 * vendor will change the board name), so we have to key off all
402 * PPT chipsets.
403 */
404 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
405 }
406 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
407 (pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI ||
408 pdev->device == PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_XHCI)) {
409 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
410 xhci->quirks |= XHCI_SPURIOUS_WAKEUP;
411 }
412 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
413 (pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
414 pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI ||
415 pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
416 pdev->device == PCI_DEVICE_ID_INTEL_BROXTON_M_XHCI ||
417 pdev->device == PCI_DEVICE_ID_INTEL_BROXTON_B_XHCI ||
418 pdev->device == PCI_DEVICE_ID_INTEL_APL_XHCI ||
419 pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI ||
420 pdev->device == PCI_DEVICE_ID_INTEL_CML_XHCI)) {
421 xhci->quirks |= XHCI_PME_STUCK_QUIRK;
422 }
423 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
424 pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI)
425 xhci->quirks |= XHCI_SSIC_PORT_UNUSED;
426 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
427 (pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
428 pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
429 pdev->device == PCI_DEVICE_ID_INTEL_APL_XHCI))
430 xhci->quirks |= XHCI_INTEL_USB_ROLE_SW;
431 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
432 (pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
433 pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
434 pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI ||
435 pdev->device == PCI_DEVICE_ID_INTEL_APL_XHCI ||
436 pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI))
437 xhci->quirks |= XHCI_MISSING_CAS;
438
439 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
440 (pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI ||
441 pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_N_PCH_XHCI))
442 xhci->quirks |= XHCI_RESET_TO_DEFAULT;
443
444 if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
445 (pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_XHCI ||
446 pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_XHCI ||
447 pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_XHCI ||
448 pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_XHCI ||
449 pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_XHCI ||
450 pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_XHCI ||
451 pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_XHCI ||
452 pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_XHCI ||
453 pdev->device == PCI_DEVICE_ID_INTEL_ICE_LAKE_XHCI ||
454 pdev->device == PCI_DEVICE_ID_INTEL_TIGER_LAKE_XHCI ||
455 pdev->device == PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_XHCI))
456 xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
457
458 if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
459 (pdev->device == PCI_DEVICE_ID_EJ168 ||
460 pdev->device == PCI_DEVICE_ID_EJ188)) {
461 xhci->quirks |= XHCI_ETRON_HOST;
462 xhci->quirks |= XHCI_RESET_ON_RESUME;
463 xhci->quirks |= XHCI_BROKEN_STREAMS;
464 }
465
466 if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
467 pdev->device == 0x0014) {
468 xhci->quirks |= XHCI_ZERO_64B_REGS;
469 }
470 if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
471 pdev->device == 0x0015) {
472 xhci->quirks |= XHCI_RESET_ON_RESUME;
473 xhci->quirks |= XHCI_ZERO_64B_REGS;
474 }
475 if (pdev->vendor == PCI_VENDOR_ID_VIA)
476 xhci->quirks |= XHCI_RESET_ON_RESUME;
477
478 /* See https://bugzilla.kernel.org/show_bug.cgi?id=79511 */
479 if (pdev->vendor == PCI_VENDOR_ID_VIA &&
480 pdev->device == 0x3432)
481 xhci->quirks |= XHCI_BROKEN_STREAMS;
482
483 if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483)
484 xhci->quirks |= XHCI_LPM_SUPPORT;
485
486 if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
487 pdev->device == PCI_DEVICE_ID_ASMEDIA_1042_XHCI) {
488 /*
489 * try to tame the ASMedia 1042 controller which reports 0.96
490 * but appears to behave more like 1.0
491 */
492 xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
493 xhci->quirks |= XHCI_BROKEN_STREAMS;
494 }
495 if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
496 pdev->device == PCI_DEVICE_ID_ASMEDIA_1042A_XHCI) {
497 xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
498 }
499 if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
500 (pdev->device == PCI_DEVICE_ID_ASMEDIA_1142_XHCI ||
501 pdev->device == PCI_DEVICE_ID_ASMEDIA_2142_XHCI ||
502 pdev->device == PCI_DEVICE_ID_ASMEDIA_3242_XHCI))
503 xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
504
505 if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
506 pdev->device == PCI_DEVICE_ID_ASMEDIA_1042A_XHCI)
507 xhci->quirks |= XHCI_ASMEDIA_MODIFY_FLOWCONTROL;
508
509 if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
510 pdev->device == PCI_DEVICE_ID_ASMEDIA_3042_XHCI)
511 xhci->quirks |= XHCI_RESET_ON_RESUME;
512
513 if (pdev->vendor == PCI_VENDOR_ID_TI && pdev->device == 0x8241)
514 xhci->quirks |= XHCI_LIMIT_ENDPOINT_INTERVAL_7;
515
516 if ((pdev->vendor == PCI_VENDOR_ID_BROADCOM ||
517 pdev->vendor == PCI_VENDOR_ID_CAVIUM) &&
518 pdev->device == 0x9026)
519 xhci->quirks |= XHCI_RESET_PLL_ON_DISCONNECT;
520
521 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
522 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_2 ||
523 pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_4))
524 xhci->quirks |= XHCI_NO_SOFT_RETRY;
525
526 if (pdev->vendor == PCI_VENDOR_ID_ZHAOXIN) {
527 xhci->quirks |= XHCI_ZHAOXIN_HOST;
528 xhci->quirks |= XHCI_LPM_SUPPORT;
529
530 if (pdev->device == 0x9202) {
531 xhci->quirks |= XHCI_RESET_ON_RESUME;
532 xhci->quirks |= XHCI_ZHAOXIN_TRB_FETCH;
533 }
534
535 if (pdev->device == 0x9203)
536 xhci->quirks |= XHCI_ZHAOXIN_TRB_FETCH;
537 }
538
539 if (pdev->vendor == PCI_DEVICE_ID_CADENCE &&
540 pdev->device == PCI_DEVICE_ID_CADENCE_SSP)
541 xhci->quirks |= XHCI_CDNS_SCTX_QUIRK;
542
543 /* xHC spec requires PCI devices to support D3hot and D3cold */
544 if (xhci->hci_version >= 0x120)
545 xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
546
547 if (xhci->quirks & XHCI_RESET_ON_RESUME)
548 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
549 "QUIRK: Resetting on resume");
550 }
551
552 #ifdef CONFIG_ACPI
xhci_pme_acpi_rtd3_enable(struct pci_dev * dev)553 static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev)
554 {
555 static const guid_t intel_dsm_guid =
556 GUID_INIT(0xac340cb7, 0xe901, 0x45bf,
557 0xb7, 0xe6, 0x2b, 0x34, 0xec, 0x93, 0x1e, 0x23);
558 union acpi_object *obj;
559
560 obj = acpi_evaluate_dsm(ACPI_HANDLE(&dev->dev), &intel_dsm_guid, 3, 1,
561 NULL);
562 ACPI_FREE(obj);
563 }
564
xhci_find_lpm_incapable_ports(struct usb_hcd * hcd,struct usb_device * hdev)565 static void xhci_find_lpm_incapable_ports(struct usb_hcd *hcd, struct usb_device *hdev)
566 {
567 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
568 struct xhci_hub *rhub = &xhci->usb3_rhub;
569 int ret;
570 int i;
571
572 /* This is not the usb3 roothub we are looking for */
573 if (hcd != rhub->hcd)
574 return;
575
576 if (hdev->maxchild > rhub->num_ports) {
577 dev_err(&hdev->dev, "USB3 roothub port number mismatch\n");
578 return;
579 }
580
581 for (i = 0; i < hdev->maxchild; i++) {
582 ret = usb_acpi_port_lpm_incapable(hdev, i);
583
584 dev_dbg(&hdev->dev, "port-%d disable U1/U2 _DSM: %d\n", i + 1, ret);
585
586 if (ret >= 0) {
587 rhub->ports[i]->lpm_incapable = ret;
588 continue;
589 }
590 }
591 }
592
593 #else
xhci_pme_acpi_rtd3_enable(struct pci_dev * dev)594 static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev) { }
xhci_find_lpm_incapable_ports(struct usb_hcd * hcd,struct usb_device * hdev)595 static void xhci_find_lpm_incapable_ports(struct usb_hcd *hcd, struct usb_device *hdev) { }
596 #endif /* CONFIG_ACPI */
597
598 /* called during probe() after chip reset completes */
xhci_pci_setup(struct usb_hcd * hcd)599 static int xhci_pci_setup(struct usb_hcd *hcd)
600 {
601 struct xhci_hcd *xhci;
602 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
603 int retval;
604
605 xhci = hcd_to_xhci(hcd);
606 if (!xhci->sbrn)
607 pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
608
609 /* imod_interval is the interrupt moderation value in nanoseconds. */
610 xhci->imod_interval = 40000;
611
612 retval = xhci_gen_setup(hcd, xhci_pci_quirks);
613 if (retval)
614 return retval;
615
616 if (!usb_hcd_is_primary_hcd(hcd))
617 return 0;
618
619 if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
620 xhci_pme_acpi_rtd3_enable(pdev);
621
622 xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
623
624 /* Find any debug ports */
625 return xhci_pci_reinit(xhci, pdev);
626 }
627
xhci_pci_update_hub_device(struct usb_hcd * hcd,struct usb_device * hdev,struct usb_tt * tt,gfp_t mem_flags)628 static int xhci_pci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
629 struct usb_tt *tt, gfp_t mem_flags)
630 {
631 /* Check if acpi claims some USB3 roothub ports are lpm incapable */
632 if (!hdev->parent)
633 xhci_find_lpm_incapable_ports(hcd, hdev);
634
635 return xhci_update_hub_device(hcd, hdev, tt, mem_flags);
636 }
637
638 /*
639 * We need to register our own PCI probe function (instead of the USB core's
640 * function) in order to create a second roothub under xHCI.
641 */
xhci_pci_probe(struct pci_dev * dev,const struct pci_device_id * id)642 static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
643 {
644 int retval;
645 struct xhci_hcd *xhci;
646 struct usb_hcd *hcd;
647 struct xhci_driver_data *driver_data;
648 struct reset_control *reset;
649
650 driver_data = (struct xhci_driver_data *)id->driver_data;
651 if (driver_data && driver_data->quirks & XHCI_RENESAS_FW_QUIRK) {
652 retval = renesas_xhci_check_request_fw(dev, id);
653 if (retval)
654 return retval;
655 }
656
657 reset = devm_reset_control_get_optional_exclusive(&dev->dev, NULL);
658 if (IS_ERR(reset))
659 return PTR_ERR(reset);
660 reset_control_reset(reset);
661
662 /* Prevent runtime suspending between USB-2 and USB-3 initialization */
663 pm_runtime_get_noresume(&dev->dev);
664
665 /* Register the USB 2.0 roothub.
666 * FIXME: USB core must know to register the USB 2.0 roothub first.
667 * This is sort of silly, because we could just set the HCD driver flags
668 * to say USB 2.0, but I'm not sure what the implications would be in
669 * the other parts of the HCD code.
670 */
671 retval = usb_hcd_pci_probe(dev, &xhci_pci_hc_driver);
672
673 if (retval)
674 goto put_runtime_pm;
675
676 /* USB 2.0 roothub is stored in the PCI device now. */
677 hcd = dev_get_drvdata(&dev->dev);
678 xhci = hcd_to_xhci(hcd);
679 xhci->reset = reset;
680 xhci->shared_hcd = usb_create_shared_hcd(&xhci_pci_hc_driver, &dev->dev,
681 pci_name(dev), hcd);
682 if (!xhci->shared_hcd) {
683 retval = -ENOMEM;
684 goto dealloc_usb2_hcd;
685 }
686
687 retval = xhci_ext_cap_init(xhci);
688 if (retval)
689 goto put_usb3_hcd;
690
691 retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
692 IRQF_SHARED);
693 if (retval)
694 goto put_usb3_hcd;
695 /* Roothub already marked as USB 3.0 speed */
696
697 if (!(xhci->quirks & XHCI_BROKEN_STREAMS) &&
698 HCC_MAX_PSA(xhci->hcc_params) >= 4)
699 xhci->shared_hcd->can_do_streams = 1;
700
701 /* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
702 pm_runtime_put_noidle(&dev->dev);
703
704 if (pci_choose_state(dev, PMSG_SUSPEND) == PCI_D0)
705 pm_runtime_get(&dev->dev);
706 else if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
707 pm_runtime_allow(&dev->dev);
708
709 dma_set_max_seg_size(&dev->dev, UINT_MAX);
710
711 return 0;
712
713 put_usb3_hcd:
714 usb_put_hcd(xhci->shared_hcd);
715 dealloc_usb2_hcd:
716 usb_hcd_pci_remove(dev);
717 put_runtime_pm:
718 pm_runtime_put_noidle(&dev->dev);
719 return retval;
720 }
721
xhci_pci_remove(struct pci_dev * dev)722 static void xhci_pci_remove(struct pci_dev *dev)
723 {
724 struct xhci_hcd *xhci;
725 bool set_power_d3;
726
727 xhci = hcd_to_xhci(pci_get_drvdata(dev));
728 set_power_d3 = xhci->quirks & XHCI_SPURIOUS_WAKEUP;
729
730 xhci->xhc_state |= XHCI_STATE_REMOVING;
731
732 if (pci_choose_state(dev, PMSG_SUSPEND) == PCI_D0)
733 pm_runtime_put(&dev->dev);
734 else if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
735 pm_runtime_forbid(&dev->dev);
736
737 if (xhci->shared_hcd) {
738 usb_remove_hcd(xhci->shared_hcd);
739 usb_put_hcd(xhci->shared_hcd);
740 xhci->shared_hcd = NULL;
741 }
742
743 usb_hcd_pci_remove(dev);
744
745 /* Workaround for spurious wakeups at shutdown with HSW */
746 if (set_power_d3)
747 pci_set_power_state(dev, PCI_D3hot);
748 }
749
750 /*
751 * In some Intel xHCI controllers, in order to get D3 working,
752 * through a vendor specific SSIC CONFIG register at offset 0x883c,
753 * SSIC PORT need to be marked as "unused" before putting xHCI
754 * into D3. After D3 exit, the SSIC port need to be marked as "used".
755 * Without this change, xHCI might not enter D3 state.
756 */
xhci_ssic_port_unused_quirk(struct usb_hcd * hcd,bool suspend)757 static void xhci_ssic_port_unused_quirk(struct usb_hcd *hcd, bool suspend)
758 {
759 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
760 u32 val;
761 void __iomem *reg;
762 int i;
763
764 for (i = 0; i < SSIC_PORT_NUM; i++) {
765 reg = (void __iomem *) xhci->cap_regs +
766 SSIC_PORT_CFG2 +
767 i * SSIC_PORT_CFG2_OFFSET;
768
769 /* Notify SSIC that SSIC profile programming is not done. */
770 val = readl(reg) & ~PROG_DONE;
771 writel(val, reg);
772
773 /* Mark SSIC port as unused(suspend) or used(resume) */
774 val = readl(reg);
775 if (suspend)
776 val |= SSIC_PORT_UNUSED;
777 else
778 val &= ~SSIC_PORT_UNUSED;
779 writel(val, reg);
780
781 /* Notify SSIC that SSIC profile programming is done */
782 val = readl(reg) | PROG_DONE;
783 writel(val, reg);
784 readl(reg);
785 }
786 }
787
788 /*
789 * Make sure PME works on some Intel xHCI controllers by writing 1 to clear
790 * the Internal PME flag bit in vendor specific PMCTRL register at offset 0x80a4
791 */
xhci_pme_quirk(struct usb_hcd * hcd)792 static void xhci_pme_quirk(struct usb_hcd *hcd)
793 {
794 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
795 void __iomem *reg;
796 u32 val;
797
798 reg = (void __iomem *) xhci->cap_regs + 0x80a4;
799 val = readl(reg);
800 writel(val | BIT(28), reg);
801 readl(reg);
802 }
803
xhci_sparse_control_quirk(struct usb_hcd * hcd)804 static void xhci_sparse_control_quirk(struct usb_hcd *hcd)
805 {
806 u32 reg;
807
808 reg = readl(hcd->regs + SPARSE_CNTL_ENABLE);
809 reg &= ~BIT(SPARSE_DISABLE_BIT);
810 writel(reg, hcd->regs + SPARSE_CNTL_ENABLE);
811 }
812
xhci_pci_suspend(struct usb_hcd * hcd,bool do_wakeup)813 static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
814 {
815 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
816 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
817 int ret;
818
819 /*
820 * Systems with the TI redriver that loses port status change events
821 * need to have the registers polled during D3, so avoid D3cold.
822 */
823 if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
824 pci_d3cold_disable(pdev);
825
826 #ifdef CONFIG_SUSPEND
827 /* d3cold is broken, but only when s2idle is used */
828 if (pm_suspend_target_state == PM_SUSPEND_TO_IDLE &&
829 xhci->quirks & (XHCI_BROKEN_D3COLD_S2I))
830 pci_d3cold_disable(pdev);
831 #endif
832
833 if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
834 xhci_pme_quirk(hcd);
835
836 if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
837 xhci_ssic_port_unused_quirk(hcd, true);
838
839 if (xhci->quirks & XHCI_DISABLE_SPARSE)
840 xhci_sparse_control_quirk(hcd);
841
842 ret = xhci_suspend(xhci, do_wakeup);
843
844 /* synchronize irq when using MSI-X */
845 xhci_msix_sync_irqs(xhci);
846
847 if (ret && (xhci->quirks & XHCI_SSIC_PORT_UNUSED))
848 xhci_ssic_port_unused_quirk(hcd, false);
849
850 return ret;
851 }
852
xhci_pci_resume(struct usb_hcd * hcd,pm_message_t msg)853 static int xhci_pci_resume(struct usb_hcd *hcd, pm_message_t msg)
854 {
855 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
856 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
857 int retval = 0;
858
859 reset_control_reset(xhci->reset);
860
861 /* The BIOS on systems with the Intel Panther Point chipset may or may
862 * not support xHCI natively. That means that during system resume, it
863 * may switch the ports back to EHCI so that users can use their
864 * keyboard to select a kernel from GRUB after resume from hibernate.
865 *
866 * The BIOS is supposed to remember whether the OS had xHCI ports
867 * enabled before resume, and switch the ports back to xHCI when the
868 * BIOS/OS semaphore is written, but we all know we can't trust BIOS
869 * writers.
870 *
871 * Unconditionally switch the ports back to xHCI after a system resume.
872 * It should not matter whether the EHCI or xHCI controller is
873 * resumed first. It's enough to do the switchover in xHCI because
874 * USB core won't notice anything as the hub driver doesn't start
875 * running again until after all the devices (including both EHCI and
876 * xHCI host controllers) have been resumed.
877 */
878
879 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
880 usb_enable_intel_xhci_ports(pdev);
881
882 if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
883 xhci_ssic_port_unused_quirk(hcd, false);
884
885 if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
886 xhci_pme_quirk(hcd);
887
888 retval = xhci_resume(xhci, msg);
889 return retval;
890 }
891
xhci_pci_poweroff_late(struct usb_hcd * hcd,bool do_wakeup)892 static int xhci_pci_poweroff_late(struct usb_hcd *hcd, bool do_wakeup)
893 {
894 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
895 struct xhci_port *port;
896 struct usb_device *udev;
897 unsigned int slot_id;
898 u32 portsc;
899 int i;
900
901 /*
902 * Systems with XHCI_RESET_TO_DEFAULT quirk have boot firmware that
903 * cause significant boot delay if usb ports are in suspended U3 state
904 * during boot. Some USB devices survive in U3 state over S4 hibernate
905 *
906 * Disable ports that are in U3 if remote wake is not enabled for either
907 * host controller or connected device
908 */
909
910 if (!(xhci->quirks & XHCI_RESET_TO_DEFAULT))
911 return 0;
912
913 for (i = 0; i < HCS_MAX_PORTS(xhci->hcs_params1); i++) {
914 port = &xhci->hw_ports[i];
915 portsc = readl(port->addr);
916
917 if ((portsc & PORT_PLS_MASK) != XDEV_U3)
918 continue;
919
920 slot_id = xhci_find_slot_id_by_port(port->rhub->hcd, xhci,
921 port->hcd_portnum + 1);
922 if (!slot_id || !xhci->devs[slot_id]) {
923 xhci_err(xhci, "No dev for slot_id %d for port %d-%d in U3\n",
924 slot_id, port->rhub->hcd->self.busnum, port->hcd_portnum + 1);
925 continue;
926 }
927
928 udev = xhci->devs[slot_id]->udev;
929
930 /* if wakeup is enabled then don't disable the port */
931 if (udev->do_remote_wakeup && do_wakeup)
932 continue;
933
934 xhci_dbg(xhci, "port %d-%d in U3 without wakeup, disable it\n",
935 port->rhub->hcd->self.busnum, port->hcd_portnum + 1);
936 portsc = xhci_port_state_to_neutral(portsc);
937 writel(portsc | PORT_PE, port->addr);
938 }
939
940 return 0;
941 }
942
xhci_pci_shutdown(struct usb_hcd * hcd)943 static void xhci_pci_shutdown(struct usb_hcd *hcd)
944 {
945 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
946 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
947
948 xhci_shutdown(hcd);
949 xhci_cleanup_msix(xhci);
950
951 /* Yet another workaround for spurious wakeups at shutdown with HSW */
952 if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
953 pci_set_power_state(pdev, PCI_D3hot);
954 }
955
956 /*-------------------------------------------------------------------------*/
957
958 static const struct xhci_driver_data reneses_data = {
959 .quirks = XHCI_RENESAS_FW_QUIRK,
960 .firmware = "renesas_usb_fw.mem",
961 };
962
963 /* PCI driver selection metadata; PCI hotplugging uses this */
964 static const struct pci_device_id pci_ids[] = {
965 { PCI_DEVICE(0x1912, 0x0014),
966 .driver_data = (unsigned long)&reneses_data,
967 },
968 { PCI_DEVICE(0x1912, 0x0015),
969 .driver_data = (unsigned long)&reneses_data,
970 },
971 /* handle any USB 3.0 xHCI controller */
972 { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
973 },
974 { /* end: all zeroes */ }
975 };
976 MODULE_DEVICE_TABLE(pci, pci_ids);
977
978 /*
979 * Without CONFIG_USB_XHCI_PCI_RENESAS renesas_xhci_check_request_fw() won't
980 * load firmware, so don't encumber the xhci-pci driver with it.
981 */
982 #if IS_ENABLED(CONFIG_USB_XHCI_PCI_RENESAS)
983 MODULE_FIRMWARE("renesas_usb_fw.mem");
984 #endif
985
986 /* pci driver glue; this is a "new style" PCI driver module */
987 static struct pci_driver xhci_pci_driver = {
988 .name = hcd_name,
989 .id_table = pci_ids,
990
991 .probe = xhci_pci_probe,
992 .remove = xhci_pci_remove,
993 /* suspend and resume implemented later */
994
995 .shutdown = usb_hcd_pci_shutdown,
996 .driver = {
997 .pm = pm_ptr(&usb_hcd_pci_pm_ops),
998 },
999 };
1000
xhci_pci_init(void)1001 static int __init xhci_pci_init(void)
1002 {
1003 xhci_init_driver(&xhci_pci_hc_driver, &xhci_pci_overrides);
1004 xhci_pci_hc_driver.pci_suspend = pm_ptr(xhci_pci_suspend);
1005 xhci_pci_hc_driver.pci_resume = pm_ptr(xhci_pci_resume);
1006 xhci_pci_hc_driver.pci_poweroff_late = pm_ptr(xhci_pci_poweroff_late);
1007 xhci_pci_hc_driver.shutdown = pm_ptr(xhci_pci_shutdown);
1008 xhci_pci_hc_driver.stop = xhci_pci_stop;
1009 return pci_register_driver(&xhci_pci_driver);
1010 }
1011 module_init(xhci_pci_init);
1012
xhci_pci_exit(void)1013 static void __exit xhci_pci_exit(void)
1014 {
1015 pci_unregister_driver(&xhci_pci_driver);
1016 }
1017 module_exit(xhci_pci_exit);
1018
1019 MODULE_DESCRIPTION("xHCI PCI Host Controller Driver");
1020 MODULE_LICENSE("GPL");
1021