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Merge tag 'v4.6-rc1' into for-linus-4.6
[deliverable/linux.git] / drivers / usb / host / pci-quirks.c
1 /*
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.
6 *
7 * Copyright (c) 1999 Martin Mares <mj@ucw.cz>
8 * (and others)
9 */
10
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"
21
22
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 */
33
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 */
46
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 */
59
60 /* AMD quirk use */
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)
66 #define AX_INDXC 0x30
67 #define AX_DATAC 0x34
68
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
75
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
80
81 /*
82 * amd_chipset_gen values represent AMD different chipset generations
83 */
84 enum amd_chipset_gen {
85 NOT_AMD_CHIPSET = 0,
86 AMD_CHIPSET_SB600,
87 AMD_CHIPSET_SB700,
88 AMD_CHIPSET_SB800,
89 AMD_CHIPSET_HUDSON2,
90 AMD_CHIPSET_BOLTON,
91 AMD_CHIPSET_YANGTZE,
92 AMD_CHIPSET_UNKNOWN,
93 };
94
95 struct amd_chipset_type {
96 enum amd_chipset_gen gen;
97 u8 rev;
98 };
99
100 static struct amd_chipset_info {
101 struct pci_dev *nb_dev;
102 struct pci_dev *smbus_dev;
103 int nb_type;
104 struct amd_chipset_type sb_type;
105 int isoc_reqs;
106 int probe_count;
107 int probe_result;
108 } amd_chipset;
109
110 static DEFINE_SPINLOCK(amd_lock);
111
112 /*
113 * amd_chipset_sb_type_init - initialize amd chipset southbridge type
114 *
115 * AMD FCH/SB generation and revision is identified by SMBus controller
116 * vendor, device and revision IDs.
117 *
118 * Returns: 1 if it is an AMD chipset, 0 otherwise.
119 */
120 static int amd_chipset_sb_type_init(struct amd_chipset_info *pinfo)
121 {
122 u8 rev = 0;
123 pinfo->sb_type.gen = AMD_CHIPSET_UNKNOWN;
124
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;
135 } else {
136 pinfo->smbus_dev = pci_get_device(PCI_VENDOR_ID_AMD,
137 PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, NULL);
138
139 if (!pinfo->smbus_dev) {
140 pinfo->sb_type.gen = NOT_AMD_CHIPSET;
141 return 0;
142 }
143
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;
151 }
152
153 pinfo->sb_type.rev = rev;
154 return 1;
155 }
156
157 void sb800_prefetch(struct device *dev, int on)
158 {
159 u16 misc;
160 struct pci_dev *pdev = to_pci_dev(dev);
161
162 pci_read_config_word(pdev, 0x50, &misc);
163 if (on == 0)
164 pci_write_config_word(pdev, 0x50, misc & 0xfcff);
165 else
166 pci_write_config_word(pdev, 0x50, misc | 0x0300);
167 }
168 EXPORT_SYMBOL_GPL(sb800_prefetch);
169
170 int usb_amd_find_chipset_info(void)
171 {
172 unsigned long flags;
173 struct amd_chipset_info info;
174 int ret;
175
176 spin_lock_irqsave(&amd_lock, flags);
177
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;
183 }
184 memset(&info, 0, sizeof(info));
185 spin_unlock_irqrestore(&amd_lock, flags);
186
187 if (!amd_chipset_sb_type_init(&info)) {
188 ret = 0;
189 goto commit;
190 }
191
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;
201 }
202 ret = 0;
203 goto commit;
204 }
205
206 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x9601, NULL);
207 if (info.nb_dev) {
208 info.nb_type = 1;
209 } else {
210 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x1510, NULL);
211 if (info.nb_dev) {
212 info.nb_type = 2;
213 } else {
214 info.nb_dev = pci_get_device(PCI_VENDOR_ID_AMD,
215 0x9600, NULL);
216 if (info.nb_dev)
217 info.nb_type = 3;
218 }
219 }
220
221 ret = info.probe_result = 1;
222 printk(KERN_DEBUG "QUIRK: Enable AMD PLL fix\n");
223
224 commit:
225
226 spin_lock_irqsave(&amd_lock, flags);
227 if (amd_chipset.probe_count > 0) {
228 /* race - someone else was faster - drop devices */
229
230 /* Mark that we where here */
231 amd_chipset.probe_count++;
232 ret = amd_chipset.probe_result;
233
234 spin_unlock_irqrestore(&amd_lock, flags);
235
236 pci_dev_put(info.nb_dev);
237 pci_dev_put(info.smbus_dev);
238
239 } else {
240 /* no race - commit the result */
241 info.probe_count++;
242 amd_chipset = info;
243 spin_unlock_irqrestore(&amd_lock, flags);
244 }
245
246 return ret;
247 }
248 EXPORT_SYMBOL_GPL(usb_amd_find_chipset_info);
249
250 int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *pdev)
251 {
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)
255 return 0;
256
257 dev_dbg(&pdev->dev, "QUIRK: Enable AMD remote wakeup fix\n");
258 return 1;
259 }
260 EXPORT_SYMBOL_GPL(usb_hcd_amd_remote_wakeup_quirk);
261
262 bool usb_amd_hang_symptom_quirk(void)
263 {
264 u8 rev;
265
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);
272 }
273 EXPORT_SYMBOL_GPL(usb_amd_hang_symptom_quirk);
274
275 bool usb_amd_prefetch_quirk(void)
276 {
277 usb_amd_find_chipset_info();
278 /* SB800 needs pre-fetch fix */
279 return amd_chipset.sb_type.gen == AMD_CHIPSET_SB800;
280 }
281 EXPORT_SYMBOL_GPL(usb_amd_prefetch_quirk);
282
283 /*
284 * The hardware normally enables the A-link power management feature, which
285 * lets the system lower the power consumption in idle states.
286 *
287 * This USB quirk prevents the link going into that lower power state
288 * during isochronous transfers.
289 *
290 * Without this quirk, isochronous stream on OHCI/EHCI/xHCI controllers of
291 * some AMD platforms may stutter or have breaks occasionally.
292 */
293 static void usb_amd_quirk_pll(int disable)
294 {
295 u32 addr, addr_low, addr_high, val;
296 u32 bit = disable ? 0 : 1;
297 unsigned long flags;
298
299 spin_lock_irqsave(&amd_lock, flags);
300
301 if (disable) {
302 amd_chipset.isoc_reqs++;
303 if (amd_chipset.isoc_reqs > 1) {
304 spin_unlock_irqrestore(&amd_lock, flags);
305 return;
306 }
307 } else {
308 amd_chipset.isoc_reqs--;
309 if (amd_chipset.isoc_reqs > 0) {
310 spin_unlock_irqrestore(&amd_lock, flags);
311 return;
312 }
313 }
314
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;
323
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));
336 } else {
337 spin_unlock_irqrestore(&amd_lock, flags);
338 return;
339 }
340
341 if (disable) {
342 val &= ~0x08;
343 val |= (1 << 4) | (1 << 9);
344 } else {
345 val |= 0x08;
346 val &= ~((1 << 4) | (1 << 9));
347 }
348 outl_p(val, AB_DATA(addr));
349
350 if (!amd_chipset.nb_dev) {
351 spin_unlock_irqrestore(&amd_lock, flags);
352 return;
353 }
354
355 if (amd_chipset.nb_type == 1 || amd_chipset.nb_type == 3) {
356 addr = PCIE_P_CNTL;
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);
361
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);
367
368 addr = BIF_NB;
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);
373 val &= ~(1 << 8);
374 val |= bit << 8;
375
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);
384 if (disable)
385 val &= ~(0x3f << 7);
386 else
387 val |= 0x3f << 7;
388
389 pci_write_config_dword(amd_chipset.nb_dev,
390 NB_PCIE_INDX_DATA, val);
391
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);
397 if (disable)
398 val &= ~(0x3f << 7);
399 else
400 val |= 0x3f << 7;
401
402 pci_write_config_dword(amd_chipset.nb_dev,
403 NB_PCIE_INDX_DATA, val);
404 }
405
406 spin_unlock_irqrestore(&amd_lock, flags);
407 return;
408 }
409
410 void usb_amd_quirk_pll_disable(void)
411 {
412 usb_amd_quirk_pll(1);
413 }
414 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_disable);
415
416 void usb_amd_quirk_pll_enable(void)
417 {
418 usb_amd_quirk_pll(0);
419 }
420 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_enable);
421
422 void usb_amd_dev_put(void)
423 {
424 struct pci_dev *nb, *smbus;
425 unsigned long flags;
426
427 spin_lock_irqsave(&amd_lock, flags);
428
429 amd_chipset.probe_count--;
430 if (amd_chipset.probe_count > 0) {
431 spin_unlock_irqrestore(&amd_lock, flags);
432 return;
433 }
434
435 /* save them to pci_dev_put outside of spinlock */
436 nb = amd_chipset.nb_dev;
437 smbus = amd_chipset.smbus_dev;
438
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;
445
446 spin_unlock_irqrestore(&amd_lock, flags);
447
448 pci_dev_put(nb);
449 pci_dev_put(smbus);
450 }
451 EXPORT_SYMBOL_GPL(usb_amd_dev_put);
452
453 /*
454 * Make sure the controller is completely inactive, unable to
455 * generate interrupts or do DMA.
456 */
457 void uhci_reset_hc(struct pci_dev *pdev, unsigned long base)
458 {
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.
461 */
462 pci_write_config_word(pdev, UHCI_USBLEGSUP, UHCI_USBLEGSUP_RWC);
463
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
467 * implies.
468 */
469 outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD);
470 mb();
471 udelay(5);
472 if (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET)
473 dev_warn(&pdev->dev, "HCRESET not completed yet!\n");
474
475 /* Just to be safe, disable interrupt requests and
476 * make sure the controller is stopped.
477 */
478 outw(0, base + UHCI_USBINTR);
479 outw(0, base + UHCI_USBCMD);
480 }
481 EXPORT_SYMBOL_GPL(uhci_reset_hc);
482
483 /*
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.
486 *
487 * Returns: 1 if the controller was reset, 0 otherwise.
488 */
489 int uhci_check_and_reset_hc(struct pci_dev *pdev, unsigned long base)
490 {
491 u16 legsup;
492 unsigned int cmd, intr;
493
494 /*
495 * When restarting a suspended controller, we expect all the
496 * settings to be the same as we left them:
497 *
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.
501 *
502 * If any of these conditions are violated we do a complete reset.
503 */
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",
507 __func__, legsup);
508 goto reset_needed;
509 }
510
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",
515 __func__, cmd);
516 goto reset_needed;
517 }
518
519 intr = inw(base + UHCI_USBINTR);
520 if (intr & (~UHCI_USBINTR_RESUME)) {
521 dev_dbg(&pdev->dev, "%s: intr = 0x%04x\n",
522 __func__, intr);
523 goto reset_needed;
524 }
525 return 0;
526
527 reset_needed:
528 dev_dbg(&pdev->dev, "Performing full reset\n");
529 uhci_reset_hc(pdev, base);
530 return 1;
531 }
532 EXPORT_SYMBOL_GPL(uhci_check_and_reset_hc);
533
534 static inline int io_type_enabled(struct pci_dev *pdev, unsigned int mask)
535 {
536 u16 cmd;
537 return !pci_read_config_word(pdev, PCI_COMMAND, &cmd) && (cmd & mask);
538 }
539
540 #define pio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_IO)
541 #define mmio_enabled(dev) io_type_enabled(dev, PCI_COMMAND_MEMORY)
542
543 static void quirk_usb_handoff_uhci(struct pci_dev *pdev)
544 {
545 unsigned long base = 0;
546 int i;
547
548 if (!pio_enabled(pdev))
549 return;
550
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);
554 break;
555 }
556
557 if (base)
558 uhci_check_and_reset_hc(pdev, base);
559 }
560
561 static int mmio_resource_enabled(struct pci_dev *pdev, int idx)
562 {
563 return pci_resource_start(pdev, idx) && mmio_enabled(pdev);
564 }
565
566 static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
567 {
568 void __iomem *base;
569 u32 control;
570 u32 fminterval = 0;
571 bool no_fminterval = false;
572 int cnt;
573
574 if (!mmio_resource_enabled(pdev, 0))
575 return;
576
577 base = pci_ioremap_bar(pdev, 0);
578 if (base == NULL)
579 return;
580
581 /*
582 * ULi M5237 OHCI controller locks the whole system when accessing
583 * the OHCI_FMINTERVAL offset.
584 */
585 if (pdev->vendor == PCI_VENDOR_ID_AL && pdev->device == 0x5237)
586 no_fminterval = true;
587
588 control = readl(base + OHCI_CONTROL);
589
590 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
591 #ifdef __hppa__
592 #define OHCI_CTRL_MASK (OHCI_CTRL_RWC | OHCI_CTRL_IR)
593 #else
594 #define OHCI_CTRL_MASK OHCI_CTRL_RWC
595
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) {
602 wait_time -= 10;
603 msleep(10);
604 }
605 if (wait_time <= 0)
606 dev_warn(&pdev->dev,
607 "OHCI: BIOS handoff failed (BIOS bug?) %08x\n",
608 readl(base + OHCI_CONTROL));
609 }
610 #endif
611
612 /* disable interrupts */
613 writel((u32) ~0, base + OHCI_INTRDISABLE);
614
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);
620
621 /* drive bus reset for at least 50 ms (7.1.7.5) */
622 msleep(50);
623 }
624
625 /* software reset of the controller, preserving HcFmInterval */
626 if (!no_fminterval)
627 fminterval = readl(base + OHCI_FMINTERVAL);
628
629 writel(OHCI_HCR, base + OHCI_CMDSTATUS);
630
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)
634 break;
635 udelay(1);
636 }
637
638 if (!no_fminterval)
639 writel(fminterval, base + OHCI_FMINTERVAL);
640
641 /* Now the controller is safely in SUSPEND and nothing can wake it up */
642 iounmap(base);
643 }
644
645 static const struct dmi_system_id ehci_dmi_nohandoff_table[] = {
646 {
647 /* Pegatron Lucid (ExoPC) */
648 .matches = {
649 DMI_MATCH(DMI_BOARD_NAME, "EXOPG06411"),
650 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-CE-133"),
651 },
652 },
653 {
654 /* Pegatron Lucid (Ordissimo AIRIS) */
655 .matches = {
656 DMI_MATCH(DMI_BOARD_NAME, "M11JB"),
657 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-"),
658 },
659 },
660 {
661 /* Pegatron Lucid (Ordissimo) */
662 .matches = {
663 DMI_MATCH(DMI_BOARD_NAME, "Ordissimo"),
664 DMI_MATCH(DMI_BIOS_VERSION, "Lucid-"),
665 },
666 },
667 {
668 /* HASEE E200 */
669 .matches = {
670 DMI_MATCH(DMI_BOARD_VENDOR, "HASEE"),
671 DMI_MATCH(DMI_BOARD_NAME, "E210"),
672 DMI_MATCH(DMI_BIOS_VERSION, "6.00"),
673 },
674 },
675 { }
676 };
677
678 static void ehci_bios_handoff(struct pci_dev *pdev,
679 void __iomem *op_reg_base,
680 u32 cap, u8 offset)
681 {
682 int try_handoff = 1, tried_handoff = 0;
683
684 /*
685 * The Pegatron Lucid tablet sporadically waits for 98 seconds trying
686 * the handoff on its unused controller. Skip it.
687 *
688 * The HASEE E200 hangs when the semaphore is set (bugzilla #77021).
689 */
690 if (pdev->vendor == 0x8086 && (pdev->device == 0x283a ||
691 pdev->device == 0x27cc)) {
692 if (dmi_check_system(ehci_dmi_nohandoff_table))
693 try_handoff = 0;
694 }
695
696 if (try_handoff && (cap & EHCI_USBLEGSUP_BIOS)) {
697 dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
698
699 #if 0
700 /* aleksey_gorelov@phoenix.com reports that some systems need SMI forced on,
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.
704 */
705 /* BIOS workaround (?): be sure the pre-Linux code
706 * receives the SMI
707 */
708 pci_read_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, &val);
709 pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS,
710 val | EHCI_USBLEGCTLSTS_SOOE);
711 #endif
712
713 /* some systems get upset if this semaphore is
714 * set for any other reason than forcing a BIOS
715 * handoff..
716 */
717 pci_write_config_byte(pdev, offset + 3, 1);
718 }
719
720 /* if boot firmware now owns EHCI, spin till it hands it over. */
721 if (try_handoff) {
722 int msec = 1000;
723 while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
724 tried_handoff = 1;
725 msleep(10);
726 msec -= 10;
727 pci_read_config_dword(pdev, offset, &cap);
728 }
729 }
730
731 if (cap & EHCI_USBLEGSUP_BIOS) {
732 /* well, possibly buggy BIOS... try to shut it down,
733 * and hope nothing goes too wrong
734 */
735 if (try_handoff)
736 dev_warn(&pdev->dev,
737 "EHCI: BIOS handoff failed (BIOS bug?) %08x\n",
738 cap);
739 pci_write_config_byte(pdev, offset + 2, 0);
740 }
741
742 /* just in case, always disable EHCI SMIs */
743 pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, 0);
744
745 /* If the BIOS ever owned the controller then we can't expect
746 * any power sessions to remain intact.
747 */
748 if (tried_handoff)
749 writel(0, op_reg_base + EHCI_CONFIGFLAG);
750 }
751
752 static void quirk_usb_disable_ehci(struct pci_dev *pdev)
753 {
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;
758
759 if (!mmio_resource_enabled(pdev, 0))
760 return;
761
762 base = pci_ioremap_bar(pdev, 0);
763 if (base == NULL)
764 return;
765
766 cap_length = readb(base);
767 op_reg_base = base + cap_length;
768
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
772 */
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);
777
778 switch (cap & 0xff) {
779 case 1:
780 ehci_bios_handoff(pdev, op_reg_base, cap, offset);
781 break;
782 case 0: /* Illegal reserved cap, set cap=0 so we exit */
783 cap = 0; /* then fallthrough... */
784 default:
785 dev_warn(&pdev->dev,
786 "EHCI: unrecognized capability %02x\n",
787 cap & 0xff);
788 }
789 offset = (cap >> 8) & 0xff;
790 }
791 if (!count)
792 dev_printk(KERN_DEBUG, &pdev->dev, "EHCI: capability loop?\n");
793
794 /*
795 * halt EHCI & disable its interrupts in any case
796 */
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);
802
803 wait_time = 2000;
804 do {
805 writel(0x3f, op_reg_base + EHCI_USBSTS);
806 udelay(100);
807 wait_time -= 100;
808 val = readl(op_reg_base + EHCI_USBSTS);
809 if ((val == ~(u32)0) || (val & EHCI_USBSTS_HALTED)) {
810 break;
811 }
812 } while (wait_time > 0);
813 }
814 writel(0, op_reg_base + EHCI_USBINTR);
815 writel(0x3f, op_reg_base + EHCI_USBSTS);
816
817 iounmap(base);
818 }
819
820 /*
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
827 *
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.
832 */
833 static int handshake(void __iomem *ptr, u32 mask, u32 done,
834 int wait_usec, int delay_usec)
835 {
836 u32 result;
837
838 do {
839 result = readl(ptr);
840 result &= mask;
841 if (result == done)
842 return 0;
843 udelay(delay_usec);
844 wait_usec -= delay_usec;
845 } while (wait_usec > 0);
846 return -ETIMEDOUT;
847 }
848
849 /*
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
853 * switchable.
854 *
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.
860 *
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.
866 */
867 void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev)
868 {
869 u32 ports_available;
870 bool ehci_found = false;
871 struct pci_dev *companion = NULL;
872
873 /* Sony VAIO t-series with subsystem device ID 90a8 is not capable of
874 * switching ports from EHCI to xHCI
875 */
876 if (xhci_pdev->subsystem_vendor == PCI_VENDOR_ID_SONY &&
877 xhci_pdev->subsystem_device == 0x90a8)
878 return;
879
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) {
884 ehci_found = true;
885 break;
886 }
887 }
888
889 if (!ehci_found)
890 return;
891
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
894 * the devices.
895 */
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);
902 return;
903 }
904
905 /* Read USB3PRM, the USB 3.0 Port Routing Mask Register
906 * Indicate the ports that can be changed from OS.
907 */
908 pci_read_config_dword(xhci_pdev, USB_INTEL_USB3PRM,
909 &ports_available);
910
911 dev_dbg(&xhci_pdev->dev, "Configurable ports to enable SuperSpeed: 0x%x\n",
912 ports_available);
913
914 /* Write USB3_PSSEN, the USB 3.0 Port SuperSpeed Enable
915 * Register, to turn on SuperSpeed terminations for the
916 * switchable ports.
917 */
918 pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
919 ports_available);
920
921 pci_read_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
922 &ports_available);
923 dev_dbg(&xhci_pdev->dev,
924 "USB 3.0 ports that are now enabled under xHCI: 0x%x\n",
925 ports_available);
926
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.
929 */
930
931 pci_read_config_dword(xhci_pdev, USB_INTEL_USB2PRM,
932 &ports_available);
933
934 dev_dbg(&xhci_pdev->dev, "Configurable USB 2.0 ports to hand over to xCHI: 0x%x\n",
935 ports_available);
936
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
939 * host.
940 */
941 pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
942 ports_available);
943
944 pci_read_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
945 &ports_available);
946 dev_dbg(&xhci_pdev->dev,
947 "USB 2.0 ports that are now switched over to xHCI: 0x%x\n",
948 ports_available);
949 }
950 EXPORT_SYMBOL_GPL(usb_enable_intel_xhci_ports);
951
952 void usb_disable_xhci_ports(struct pci_dev *xhci_pdev)
953 {
954 pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN, 0x0);
955 pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR, 0x0);
956 }
957 EXPORT_SYMBOL_GPL(usb_disable_xhci_ports);
958
959 /**
960 * PCI Quirks for xHCI.
961 *
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.
966 */
967 static void quirk_usb_handoff_xhci(struct pci_dev *pdev)
968 {
969 void __iomem *base;
970 int ext_cap_offset;
971 void __iomem *op_reg_base;
972 u32 val;
973 int timeout;
974 int len = pci_resource_len(pdev, 0);
975
976 if (!mmio_resource_enabled(pdev, 0))
977 return;
978
979 base = ioremap_nocache(pci_resource_start(pdev, 0), len);
980 if (base == NULL)
981 return;
982
983 /*
984 * Find the Legacy Support Capability register -
985 * this is optional for xHCI host controllers.
986 */
987 ext_cap_offset = xhci_find_next_ext_cap(base, 0, XHCI_EXT_CAPS_LEGACY);
988
989 if (!ext_cap_offset)
990 goto hc_init;
991
992 if ((ext_cap_offset + sizeof(val)) > len) {
993 /* We're reading garbage from the controller */
994 dev_warn(&pdev->dev, "xHCI controller failing to respond");
995 goto iounmap;
996 }
997 val = readl(base + ext_cap_offset);
998
999 /* If the BIOS owns the HC, signal that the OS wants it, and wait */
1000 if (val & XHCI_HC_BIOS_OWNED) {
1001 writel(val | XHCI_HC_OS_OWNED, base + ext_cap_offset);
1002
1003 /* Wait for 5 seconds with 10 microsecond polling interval */
1004 timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED,
1005 0, 5000, 10);
1006
1007 /* Assume a buggy BIOS and take HC ownership anyway */
1008 if (timeout) {
1009 dev_warn(&pdev->dev,
1010 "xHCI BIOS handoff failed (BIOS bug ?) %08x\n",
1011 val);
1012 writel(val & ~XHCI_HC_BIOS_OWNED, base + ext_cap_offset);
1013 }
1014 }
1015
1016 val = readl(base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
1017 /* Mask off (turn off) any enabled SMIs */
1018 val &= XHCI_LEGACY_DISABLE_SMI;
1019 /* Mask all SMI events bits, RW1C */
1020 val |= XHCI_LEGACY_SMI_EVENTS;
1021 /* Disable any BIOS SMIs and clear all SMI events*/
1022 writel(val, base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
1023
1024 hc_init:
1025 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
1026 usb_enable_intel_xhci_ports(pdev);
1027
1028 op_reg_base = base + XHCI_HC_LENGTH(readl(base));
1029
1030 /* Wait for the host controller to be ready before writing any
1031 * operational or runtime registers. Wait 5 seconds and no more.
1032 */
1033 timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_CNR, 0,
1034 5000, 10);
1035 /* Assume a buggy HC and start HC initialization anyway */
1036 if (timeout) {
1037 val = readl(op_reg_base + XHCI_STS_OFFSET);
1038 dev_warn(&pdev->dev,
1039 "xHCI HW not ready after 5 sec (HC bug?) status = 0x%x\n",
1040 val);
1041 }
1042
1043 /* Send the halt and disable interrupts command */
1044 val = readl(op_reg_base + XHCI_CMD_OFFSET);
1045 val &= ~(XHCI_CMD_RUN | XHCI_IRQS);
1046 writel(val, op_reg_base + XHCI_CMD_OFFSET);
1047
1048 /* Wait for the HC to halt - poll every 125 usec (one microframe). */
1049 timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_HALT, 1,
1050 XHCI_MAX_HALT_USEC, 125);
1051 if (timeout) {
1052 val = readl(op_reg_base + XHCI_STS_OFFSET);
1053 dev_warn(&pdev->dev,
1054 "xHCI HW did not halt within %d usec status = 0x%x\n",
1055 XHCI_MAX_HALT_USEC, val);
1056 }
1057
1058 iounmap:
1059 iounmap(base);
1060 }
1061
1062 static void quirk_usb_early_handoff(struct pci_dev *pdev)
1063 {
1064 /* Skip Netlogic mips SoC's internal PCI USB controller.
1065 * This device does not need/support EHCI/OHCI handoff
1066 */
1067 if (pdev->vendor == 0x184e) /* vendor Netlogic */
1068 return;
1069 if (pdev->class != PCI_CLASS_SERIAL_USB_UHCI &&
1070 pdev->class != PCI_CLASS_SERIAL_USB_OHCI &&
1071 pdev->class != PCI_CLASS_SERIAL_USB_EHCI &&
1072 pdev->class != PCI_CLASS_SERIAL_USB_XHCI)
1073 return;
1074
1075 if (pci_enable_device(pdev) < 0) {
1076 dev_warn(&pdev->dev,
1077 "Can't enable PCI device, BIOS handoff failed.\n");
1078 return;
1079 }
1080 if (pdev->class == PCI_CLASS_SERIAL_USB_UHCI)
1081 quirk_usb_handoff_uhci(pdev);
1082 else if (pdev->class == PCI_CLASS_SERIAL_USB_OHCI)
1083 quirk_usb_handoff_ohci(pdev);
1084 else if (pdev->class == PCI_CLASS_SERIAL_USB_EHCI)
1085 quirk_usb_disable_ehci(pdev);
1086 else if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI)
1087 quirk_usb_handoff_xhci(pdev);
1088 pci_disable_device(pdev);
1089 }
1090 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
1091 PCI_CLASS_SERIAL_USB, 8, quirk_usb_early_handoff);
Linux kernel - Deliverables
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