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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[deliverable/linux.git] / drivers / usb / host / ohci-hcd.c
1 /*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
6 *
7 * [ Initialisation is based on Linus' ]
8 * [ uhci code and gregs ohci fragments ]
9 * [ (C) Copyright 1999 Linus Torvalds ]
10 * [ (C) Copyright 1999 Gregory P. Smith]
11 *
12 *
13 * OHCI is the main "non-Intel/VIA" standard for USB 1.1 host controller
14 * interfaces (though some non-x86 Intel chips use it). It supports
15 * smarter hardware than UHCI. A download link for the spec available
16 * through the http://www.usb.org website.
17 *
18 * This file is licenced under the GPL.
19 */
20
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/pci.h>
24 #include <linux/kernel.h>
25 #include <linux/delay.h>
26 #include <linux/ioport.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/errno.h>
30 #include <linux/init.h>
31 #include <linux/timer.h>
32 #include <linux/list.h>
33 #include <linux/usb.h>
34 #include <linux/usb/otg.h>
35 #include <linux/dma-mapping.h>
36 #include <linux/dmapool.h>
37 #include <linux/reboot.h>
38 #include <linux/workqueue.h>
39
40 #include <asm/io.h>
41 #include <asm/irq.h>
42 #include <asm/system.h>
43 #include <asm/unaligned.h>
44 #include <asm/byteorder.h>
45
46 #include "../core/hcd.h"
47
48 #define DRIVER_VERSION "2006 August 04"
49 #define DRIVER_AUTHOR "Roman Weissgaerber, David Brownell"
50 #define DRIVER_DESC "USB 1.1 'Open' Host Controller (OHCI) Driver"
51
52 /*-------------------------------------------------------------------------*/
53
54 #undef OHCI_VERBOSE_DEBUG /* not always helpful */
55
56 /* For initializing controller (mask in an HCFS mode too) */
57 #define OHCI_CONTROL_INIT OHCI_CTRL_CBSR
58 #define OHCI_INTR_INIT \
59 (OHCI_INTR_MIE | OHCI_INTR_RHSC | OHCI_INTR_UE \
60 | OHCI_INTR_RD | OHCI_INTR_WDH)
61
62 #ifdef __hppa__
63 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
64 #define IR_DISABLE
65 #endif
66
67 #ifdef CONFIG_ARCH_OMAP
68 /* OMAP doesn't support IR (no SMM; not needed) */
69 #define IR_DISABLE
70 #endif
71
72 /*-------------------------------------------------------------------------*/
73
74 static const char hcd_name [] = "ohci_hcd";
75
76 #define STATECHANGE_DELAY msecs_to_jiffies(300)
77
78 #include "ohci.h"
79
80 static void ohci_dump (struct ohci_hcd *ohci, int verbose);
81 static int ohci_init (struct ohci_hcd *ohci);
82 static void ohci_stop (struct usb_hcd *hcd);
83 static int ohci_restart (struct ohci_hcd *ohci);
84
85 #include "ohci-hub.c"
86 #include "ohci-dbg.c"
87 #include "ohci-mem.c"
88 #include "ohci-q.c"
89
90
91 /*
92 * On architectures with edge-triggered interrupts we must never return
93 * IRQ_NONE.
94 */
95 #if defined(CONFIG_SA1111) /* ... or other edge-triggered systems */
96 #define IRQ_NOTMINE IRQ_HANDLED
97 #else
98 #define IRQ_NOTMINE IRQ_NONE
99 #endif
100
101
102 /* Some boards misreport power switching/overcurrent */
103 static int distrust_firmware = 1;
104 module_param (distrust_firmware, bool, 0);
105 MODULE_PARM_DESC (distrust_firmware,
106 "true to distrust firmware power/overcurrent setup");
107
108 /* Some boards leave IR set wrongly, since they fail BIOS/SMM handshakes */
109 static int no_handshake = 0;
110 module_param (no_handshake, bool, 0);
111 MODULE_PARM_DESC (no_handshake, "true (not default) disables BIOS handshake");
112
113 /*-------------------------------------------------------------------------*/
114
115 /*
116 * queue up an urb for anything except the root hub
117 */
118 static int ohci_urb_enqueue (
119 struct usb_hcd *hcd,
120 struct urb *urb,
121 gfp_t mem_flags
122 ) {
123 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
124 struct ed *ed;
125 urb_priv_t *urb_priv;
126 unsigned int pipe = urb->pipe;
127 int i, size = 0;
128 unsigned long flags;
129 int retval = 0;
130
131 #ifdef OHCI_VERBOSE_DEBUG
132 urb_print(urb, "SUB", usb_pipein(pipe), -EINPROGRESS);
133 #endif
134
135 /* every endpoint has a ed, locate and maybe (re)initialize it */
136 if (! (ed = ed_get (ohci, urb->ep, urb->dev, pipe, urb->interval)))
137 return -ENOMEM;
138
139 /* for the private part of the URB we need the number of TDs (size) */
140 switch (ed->type) {
141 case PIPE_CONTROL:
142 /* td_submit_urb() doesn't yet handle these */
143 if (urb->transfer_buffer_length > 4096)
144 return -EMSGSIZE;
145
146 /* 1 TD for setup, 1 for ACK, plus ... */
147 size = 2;
148 /* FALLTHROUGH */
149 // case PIPE_INTERRUPT:
150 // case PIPE_BULK:
151 default:
152 /* one TD for every 4096 Bytes (can be upto 8K) */
153 size += urb->transfer_buffer_length / 4096;
154 /* ... and for any remaining bytes ... */
155 if ((urb->transfer_buffer_length % 4096) != 0)
156 size++;
157 /* ... and maybe a zero length packet to wrap it up */
158 if (size == 0)
159 size++;
160 else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
161 && (urb->transfer_buffer_length
162 % usb_maxpacket (urb->dev, pipe,
163 usb_pipeout (pipe))) == 0)
164 size++;
165 break;
166 case PIPE_ISOCHRONOUS: /* number of packets from URB */
167 size = urb->number_of_packets;
168 break;
169 }
170
171 /* allocate the private part of the URB */
172 urb_priv = kzalloc (sizeof (urb_priv_t) + size * sizeof (struct td *),
173 mem_flags);
174 if (!urb_priv)
175 return -ENOMEM;
176 INIT_LIST_HEAD (&urb_priv->pending);
177 urb_priv->length = size;
178 urb_priv->ed = ed;
179
180 /* allocate the TDs (deferring hash chain updates) */
181 for (i = 0; i < size; i++) {
182 urb_priv->td [i] = td_alloc (ohci, mem_flags);
183 if (!urb_priv->td [i]) {
184 urb_priv->length = i;
185 urb_free_priv (ohci, urb_priv);
186 return -ENOMEM;
187 }
188 }
189
190 spin_lock_irqsave (&ohci->lock, flags);
191
192 /* don't submit to a dead HC */
193 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
194 retval = -ENODEV;
195 goto fail;
196 }
197 if (!HC_IS_RUNNING(hcd->state)) {
198 retval = -ENODEV;
199 goto fail;
200 }
201 retval = usb_hcd_link_urb_to_ep(hcd, urb);
202 if (retval)
203 goto fail;
204
205 /* schedule the ed if needed */
206 if (ed->state == ED_IDLE) {
207 retval = ed_schedule (ohci, ed);
208 if (retval < 0) {
209 usb_hcd_unlink_urb_from_ep(hcd, urb);
210 goto fail;
211 }
212 if (ed->type == PIPE_ISOCHRONOUS) {
213 u16 frame = ohci_frame_no(ohci);
214
215 /* delay a few frames before the first TD */
216 frame += max_t (u16, 8, ed->interval);
217 frame &= ~(ed->interval - 1);
218 frame |= ed->branch;
219 urb->start_frame = frame;
220
221 /* yes, only URB_ISO_ASAP is supported, and
222 * urb->start_frame is never used as input.
223 */
224 }
225 } else if (ed->type == PIPE_ISOCHRONOUS)
226 urb->start_frame = ed->last_iso + ed->interval;
227
228 /* fill the TDs and link them to the ed; and
229 * enable that part of the schedule, if needed
230 * and update count of queued periodic urbs
231 */
232 urb->hcpriv = urb_priv;
233 td_submit_urb (ohci, urb);
234
235 fail:
236 if (retval)
237 urb_free_priv (ohci, urb_priv);
238 spin_unlock_irqrestore (&ohci->lock, flags);
239 return retval;
240 }
241
242 /*
243 * decouple the URB from the HC queues (TDs, urb_priv).
244 * reporting is always done
245 * asynchronously, and we might be dealing with an urb that's
246 * partially transferred, or an ED with other urbs being unlinked.
247 */
248 static int ohci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
249 {
250 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
251 unsigned long flags;
252 int rc;
253
254 #ifdef OHCI_VERBOSE_DEBUG
255 urb_print(urb, "UNLINK", 1, status);
256 #endif
257
258 spin_lock_irqsave (&ohci->lock, flags);
259 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
260 if (rc) {
261 ; /* Do nothing */
262 } else if (HC_IS_RUNNING(hcd->state)) {
263 urb_priv_t *urb_priv;
264
265 /* Unless an IRQ completed the unlink while it was being
266 * handed to us, flag it for unlink and giveback, and force
267 * some upcoming INTR_SF to call finish_unlinks()
268 */
269 urb_priv = urb->hcpriv;
270 if (urb_priv) {
271 if (urb_priv->ed->state == ED_OPER)
272 start_ed_unlink (ohci, urb_priv->ed);
273 }
274 } else {
275 /*
276 * with HC dead, we won't respect hc queue pointers
277 * any more ... just clean up every urb's memory.
278 */
279 if (urb->hcpriv)
280 finish_urb(ohci, urb, status);
281 }
282 spin_unlock_irqrestore (&ohci->lock, flags);
283 return rc;
284 }
285
286 /*-------------------------------------------------------------------------*/
287
288 /* frees config/altsetting state for endpoints,
289 * including ED memory, dummy TD, and bulk/intr data toggle
290 */
291
292 static void
293 ohci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
294 {
295 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
296 unsigned long flags;
297 struct ed *ed = ep->hcpriv;
298 unsigned limit = 1000;
299
300 /* ASSERT: any requests/urbs are being unlinked */
301 /* ASSERT: nobody can be submitting urbs for this any more */
302
303 if (!ed)
304 return;
305
306 rescan:
307 spin_lock_irqsave (&ohci->lock, flags);
308
309 if (!HC_IS_RUNNING (hcd->state)) {
310 sanitize:
311 ed->state = ED_IDLE;
312 if (quirk_zfmicro(ohci) && ed->type == PIPE_INTERRUPT)
313 ohci->eds_scheduled--;
314 finish_unlinks (ohci, 0);
315 }
316
317 switch (ed->state) {
318 case ED_UNLINK: /* wait for hw to finish? */
319 /* major IRQ delivery trouble loses INTR_SF too... */
320 if (limit-- == 0) {
321 ohci_warn(ohci, "ED unlink timeout\n");
322 if (quirk_zfmicro(ohci)) {
323 ohci_warn(ohci, "Attempting ZF TD recovery\n");
324 ohci->ed_to_check = ed;
325 ohci->zf_delay = 2;
326 }
327 goto sanitize;
328 }
329 spin_unlock_irqrestore (&ohci->lock, flags);
330 schedule_timeout_uninterruptible(1);
331 goto rescan;
332 case ED_IDLE: /* fully unlinked */
333 if (list_empty (&ed->td_list)) {
334 td_free (ohci, ed->dummy);
335 ed_free (ohci, ed);
336 break;
337 }
338 /* else FALL THROUGH */
339 default:
340 /* caller was supposed to have unlinked any requests;
341 * that's not our job. can't recover; must leak ed.
342 */
343 ohci_err (ohci, "leak ed %p (#%02x) state %d%s\n",
344 ed, ep->desc.bEndpointAddress, ed->state,
345 list_empty (&ed->td_list) ? "" : " (has tds)");
346 td_free (ohci, ed->dummy);
347 break;
348 }
349 ep->hcpriv = NULL;
350 spin_unlock_irqrestore (&ohci->lock, flags);
351 return;
352 }
353
354 static int ohci_get_frame (struct usb_hcd *hcd)
355 {
356 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
357
358 return ohci_frame_no(ohci);
359 }
360
361 static void ohci_usb_reset (struct ohci_hcd *ohci)
362 {
363 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
364 ohci->hc_control &= OHCI_CTRL_RWC;
365 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
366 }
367
368 /* ohci_shutdown forcibly disables IRQs and DMA, helping kexec and
369 * other cases where the next software may expect clean state from the
370 * "firmware". this is bus-neutral, unlike shutdown() methods.
371 */
372 static void
373 ohci_shutdown (struct usb_hcd *hcd)
374 {
375 struct ohci_hcd *ohci;
376
377 ohci = hcd_to_ohci (hcd);
378 ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
379 ohci_usb_reset (ohci);
380 /* flush the writes */
381 (void) ohci_readl (ohci, &ohci->regs->control);
382 }
383
384 static int check_ed(struct ohci_hcd *ohci, struct ed *ed)
385 {
386 return (hc32_to_cpu(ohci, ed->hwINFO) & ED_IN) != 0
387 && (hc32_to_cpu(ohci, ed->hwHeadP) & TD_MASK)
388 == (hc32_to_cpu(ohci, ed->hwTailP) & TD_MASK)
389 && !list_empty(&ed->td_list);
390 }
391
392 /* ZF Micro watchdog timer callback. The ZF Micro chipset sometimes completes
393 * an interrupt TD but neglects to add it to the donelist. On systems with
394 * this chipset, we need to periodically check the state of the queues to look
395 * for such "lost" TDs.
396 */
397 static void unlink_watchdog_func(unsigned long _ohci)
398 {
399 long flags;
400 unsigned max;
401 unsigned seen_count = 0;
402 unsigned i;
403 struct ed **seen = NULL;
404 struct ohci_hcd *ohci = (struct ohci_hcd *) _ohci;
405
406 spin_lock_irqsave(&ohci->lock, flags);
407 max = ohci->eds_scheduled;
408 if (!max)
409 goto done;
410
411 if (ohci->ed_to_check)
412 goto out;
413
414 seen = kcalloc(max, sizeof *seen, GFP_ATOMIC);
415 if (!seen)
416 goto out;
417
418 for (i = 0; i < NUM_INTS; i++) {
419 struct ed *ed = ohci->periodic[i];
420
421 while (ed) {
422 unsigned temp;
423
424 /* scan this branch of the periodic schedule tree */
425 for (temp = 0; temp < seen_count; temp++) {
426 if (seen[temp] == ed) {
427 /* we've checked it and what's after */
428 ed = NULL;
429 break;
430 }
431 }
432 if (!ed)
433 break;
434 seen[seen_count++] = ed;
435 if (!check_ed(ohci, ed)) {
436 ed = ed->ed_next;
437 continue;
438 }
439
440 /* HC's TD list is empty, but HCD sees at least one
441 * TD that's not been sent through the donelist.
442 */
443 ohci->ed_to_check = ed;
444 ohci->zf_delay = 2;
445
446 /* The HC may wait until the next frame to report the
447 * TD as done through the donelist and INTR_WDH. (We
448 * just *assume* it's not a multi-TD interrupt URB;
449 * those could defer the IRQ more than one frame, using
450 * DI...) Check again after the next INTR_SF.
451 */
452 ohci_writel(ohci, OHCI_INTR_SF,
453 &ohci->regs->intrstatus);
454 ohci_writel(ohci, OHCI_INTR_SF,
455 &ohci->regs->intrenable);
456
457 /* flush those writes */
458 (void) ohci_readl(ohci, &ohci->regs->control);
459
460 goto out;
461 }
462 }
463 out:
464 kfree(seen);
465 if (ohci->eds_scheduled)
466 mod_timer(&ohci->unlink_watchdog, round_jiffies_relative(HZ));
467 done:
468 spin_unlock_irqrestore(&ohci->lock, flags);
469 }
470
471 /*-------------------------------------------------------------------------*
472 * HC functions
473 *-------------------------------------------------------------------------*/
474
475 /* init memory, and kick BIOS/SMM off */
476
477 static int ohci_init (struct ohci_hcd *ohci)
478 {
479 int ret;
480 struct usb_hcd *hcd = ohci_to_hcd(ohci);
481
482 disable (ohci);
483 ohci->regs = hcd->regs;
484
485 /* REVISIT this BIOS handshake is now moved into PCI "quirks", and
486 * was never needed for most non-PCI systems ... remove the code?
487 */
488
489 #ifndef IR_DISABLE
490 /* SMM owns the HC? not for long! */
491 if (!no_handshake && ohci_readl (ohci,
492 &ohci->regs->control) & OHCI_CTRL_IR) {
493 u32 temp;
494
495 ohci_dbg (ohci, "USB HC TakeOver from BIOS/SMM\n");
496
497 /* this timeout is arbitrary. we make it long, so systems
498 * depending on usb keyboards may be usable even if the
499 * BIOS/SMM code seems pretty broken.
500 */
501 temp = 500; /* arbitrary: five seconds */
502
503 ohci_writel (ohci, OHCI_INTR_OC, &ohci->regs->intrenable);
504 ohci_writel (ohci, OHCI_OCR, &ohci->regs->cmdstatus);
505 while (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_IR) {
506 msleep (10);
507 if (--temp == 0) {
508 ohci_err (ohci, "USB HC takeover failed!"
509 " (BIOS/SMM bug)\n");
510 return -EBUSY;
511 }
512 }
513 ohci_usb_reset (ohci);
514 }
515 #endif
516
517 /* Disable HC interrupts */
518 ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
519
520 /* flush the writes, and save key bits like RWC */
521 if (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_RWC)
522 ohci->hc_control |= OHCI_CTRL_RWC;
523
524 /* Read the number of ports unless overridden */
525 if (ohci->num_ports == 0)
526 ohci->num_ports = roothub_a(ohci) & RH_A_NDP;
527
528 if (ohci->hcca)
529 return 0;
530
531 ohci->hcca = dma_alloc_coherent (hcd->self.controller,
532 sizeof *ohci->hcca, &ohci->hcca_dma, 0);
533 if (!ohci->hcca)
534 return -ENOMEM;
535
536 if ((ret = ohci_mem_init (ohci)) < 0)
537 ohci_stop (hcd);
538 else {
539 create_debug_files (ohci);
540 }
541
542 return ret;
543 }
544
545 /*-------------------------------------------------------------------------*/
546
547 /* Start an OHCI controller, set the BUS operational
548 * resets USB and controller
549 * enable interrupts
550 */
551 static int ohci_run (struct ohci_hcd *ohci)
552 {
553 u32 mask, temp;
554 int first = ohci->fminterval == 0;
555 struct usb_hcd *hcd = ohci_to_hcd(ohci);
556
557 disable (ohci);
558
559 /* boot firmware should have set this up (5.1.1.3.1) */
560 if (first) {
561
562 temp = ohci_readl (ohci, &ohci->regs->fminterval);
563 ohci->fminterval = temp & 0x3fff;
564 if (ohci->fminterval != FI)
565 ohci_dbg (ohci, "fminterval delta %d\n",
566 ohci->fminterval - FI);
567 ohci->fminterval |= FSMP (ohci->fminterval) << 16;
568 /* also: power/overcurrent flags in roothub.a */
569 }
570
571 /* Reset USB nearly "by the book". RemoteWakeupConnected was
572 * saved if boot firmware (BIOS/SMM/...) told us it's connected,
573 * or if bus glue did the same (e.g. for PCI add-in cards with
574 * PCI PM support).
575 */
576 if ((ohci->hc_control & OHCI_CTRL_RWC) != 0
577 && !device_may_wakeup(hcd->self.controller))
578 device_init_wakeup(hcd->self.controller, 1);
579
580 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
581 case OHCI_USB_OPER:
582 temp = 0;
583 break;
584 case OHCI_USB_SUSPEND:
585 case OHCI_USB_RESUME:
586 ohci->hc_control &= OHCI_CTRL_RWC;
587 ohci->hc_control |= OHCI_USB_RESUME;
588 temp = 10 /* msec wait */;
589 break;
590 // case OHCI_USB_RESET:
591 default:
592 ohci->hc_control &= OHCI_CTRL_RWC;
593 ohci->hc_control |= OHCI_USB_RESET;
594 temp = 50 /* msec wait */;
595 break;
596 }
597 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
598 // flush the writes
599 (void) ohci_readl (ohci, &ohci->regs->control);
600 msleep(temp);
601
602 memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
603
604 /* 2msec timelimit here means no irqs/preempt */
605 spin_lock_irq (&ohci->lock);
606
607 retry:
608 /* HC Reset requires max 10 us delay */
609 ohci_writel (ohci, OHCI_HCR, &ohci->regs->cmdstatus);
610 temp = 30; /* ... allow extra time */
611 while ((ohci_readl (ohci, &ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
612 if (--temp == 0) {
613 spin_unlock_irq (&ohci->lock);
614 ohci_err (ohci, "USB HC reset timed out!\n");
615 return -1;
616 }
617 udelay (1);
618 }
619
620 /* now we're in the SUSPEND state ... must go OPERATIONAL
621 * within 2msec else HC enters RESUME
622 *
623 * ... but some hardware won't init fmInterval "by the book"
624 * (SiS, OPTi ...), so reset again instead. SiS doesn't need
625 * this if we write fmInterval after we're OPERATIONAL.
626 * Unclear about ALi, ServerWorks, and others ... this could
627 * easily be a longstanding bug in chip init on Linux.
628 */
629 if (ohci->flags & OHCI_QUIRK_INITRESET) {
630 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
631 // flush those writes
632 (void) ohci_readl (ohci, &ohci->regs->control);
633 }
634
635 /* Tell the controller where the control and bulk lists are
636 * The lists are empty now. */
637 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
638 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
639
640 /* a reset clears this */
641 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
642
643 periodic_reinit (ohci);
644
645 /* some OHCI implementations are finicky about how they init.
646 * bogus values here mean not even enumeration could work.
647 */
648 if ((ohci_readl (ohci, &ohci->regs->fminterval) & 0x3fff0000) == 0
649 || !ohci_readl (ohci, &ohci->regs->periodicstart)) {
650 if (!(ohci->flags & OHCI_QUIRK_INITRESET)) {
651 ohci->flags |= OHCI_QUIRK_INITRESET;
652 ohci_dbg (ohci, "enabling initreset quirk\n");
653 goto retry;
654 }
655 spin_unlock_irq (&ohci->lock);
656 ohci_err (ohci, "init err (%08x %04x)\n",
657 ohci_readl (ohci, &ohci->regs->fminterval),
658 ohci_readl (ohci, &ohci->regs->periodicstart));
659 return -EOVERFLOW;
660 }
661
662 /* use rhsc irqs after khubd is fully initialized */
663 hcd->poll_rh = 1;
664 hcd->uses_new_polling = 1;
665
666 /* start controller operations */
667 ohci->hc_control &= OHCI_CTRL_RWC;
668 ohci->hc_control |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
669 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
670 hcd->state = HC_STATE_RUNNING;
671
672 /* wake on ConnectStatusChange, matching external hubs */
673 ohci_writel (ohci, RH_HS_DRWE, &ohci->regs->roothub.status);
674
675 /* Choose the interrupts we care about now, others later on demand */
676 mask = OHCI_INTR_INIT;
677 ohci_writel (ohci, ~0, &ohci->regs->intrstatus);
678 ohci_writel (ohci, mask, &ohci->regs->intrenable);
679
680 /* handle root hub init quirks ... */
681 temp = roothub_a (ohci);
682 temp &= ~(RH_A_PSM | RH_A_OCPM);
683 if (ohci->flags & OHCI_QUIRK_SUPERIO) {
684 /* NSC 87560 and maybe others */
685 temp |= RH_A_NOCP;
686 temp &= ~(RH_A_POTPGT | RH_A_NPS);
687 ohci_writel (ohci, temp, &ohci->regs->roothub.a);
688 } else if ((ohci->flags & OHCI_QUIRK_AMD756) || distrust_firmware) {
689 /* hub power always on; required for AMD-756 and some
690 * Mac platforms. ganged overcurrent reporting, if any.
691 */
692 temp |= RH_A_NPS;
693 ohci_writel (ohci, temp, &ohci->regs->roothub.a);
694 }
695 ohci_writel (ohci, RH_HS_LPSC, &ohci->regs->roothub.status);
696 ohci_writel (ohci, (temp & RH_A_NPS) ? 0 : RH_B_PPCM,
697 &ohci->regs->roothub.b);
698 // flush those writes
699 (void) ohci_readl (ohci, &ohci->regs->control);
700
701 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
702 spin_unlock_irq (&ohci->lock);
703
704 // POTPGT delay is bits 24-31, in 2 ms units.
705 mdelay ((temp >> 23) & 0x1fe);
706 hcd->state = HC_STATE_RUNNING;
707
708 if (quirk_zfmicro(ohci)) {
709 /* Create timer to watch for bad queue state on ZF Micro */
710 setup_timer(&ohci->unlink_watchdog, unlink_watchdog_func,
711 (unsigned long) ohci);
712
713 ohci->eds_scheduled = 0;
714 ohci->ed_to_check = NULL;
715 }
716
717 ohci_dump (ohci, 1);
718
719 return 0;
720 }
721
722 /*-------------------------------------------------------------------------*/
723
724 /* an interrupt happens */
725
726 static irqreturn_t ohci_irq (struct usb_hcd *hcd)
727 {
728 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
729 struct ohci_regs __iomem *regs = ohci->regs;
730 int ints;
731
732 /* we can eliminate a (slow) ohci_readl()
733 * if _only_ WDH caused this irq
734 */
735 if ((ohci->hcca->done_head != 0)
736 && ! (hc32_to_cpup (ohci, &ohci->hcca->done_head)
737 & 0x01)) {
738 ints = OHCI_INTR_WDH;
739
740 /* cardbus/... hardware gone before remove() */
741 } else if ((ints = ohci_readl (ohci, &regs->intrstatus)) == ~(u32)0) {
742 disable (ohci);
743 ohci_dbg (ohci, "device removed!\n");
744 return IRQ_HANDLED;
745
746 /* interrupt for some other device? */
747 } else if ((ints &= ohci_readl (ohci, &regs->intrenable)) == 0) {
748 return IRQ_NOTMINE;
749 }
750
751 if (ints & OHCI_INTR_UE) {
752 // e.g. due to PCI Master/Target Abort
753 if (quirk_nec(ohci)) {
754 /* Workaround for a silicon bug in some NEC chips used
755 * in Apple's PowerBooks. Adapted from Darwin code.
756 */
757 ohci_err (ohci, "OHCI Unrecoverable Error, scheduling NEC chip restart\n");
758
759 ohci_writel (ohci, OHCI_INTR_UE, &regs->intrdisable);
760
761 schedule_work (&ohci->nec_work);
762 } else {
763 disable (ohci);
764 ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
765 }
766
767 ohci_dump (ohci, 1);
768 ohci_usb_reset (ohci);
769 }
770
771 if (ints & OHCI_INTR_RHSC) {
772 ohci_vdbg(ohci, "rhsc\n");
773 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
774 ohci_writel(ohci, OHCI_INTR_RD | OHCI_INTR_RHSC,
775 &regs->intrstatus);
776
777 /* NOTE: Vendors didn't always make the same implementation
778 * choices for RHSC. Many followed the spec; RHSC triggers
779 * on an edge, like setting and maybe clearing a port status
780 * change bit. With others it's level-triggered, active
781 * until khubd clears all the port status change bits. We'll
782 * always disable it here and rely on polling until khubd
783 * re-enables it.
784 */
785 ohci_writel(ohci, OHCI_INTR_RHSC, &regs->intrdisable);
786 usb_hcd_poll_rh_status(hcd);
787 }
788
789 /* For connect and disconnect events, we expect the controller
790 * to turn on RHSC along with RD. But for remote wakeup events
791 * this might not happen.
792 */
793 else if (ints & OHCI_INTR_RD) {
794 ohci_vdbg(ohci, "resume detect\n");
795 ohci_writel(ohci, OHCI_INTR_RD, &regs->intrstatus);
796 hcd->poll_rh = 1;
797 if (ohci->autostop) {
798 spin_lock (&ohci->lock);
799 ohci_rh_resume (ohci);
800 spin_unlock (&ohci->lock);
801 } else
802 usb_hcd_resume_root_hub(hcd);
803 }
804
805 if (ints & OHCI_INTR_WDH) {
806 if (HC_IS_RUNNING(hcd->state))
807 ohci_writel (ohci, OHCI_INTR_WDH, &regs->intrdisable);
808 spin_lock (&ohci->lock);
809 dl_done_list (ohci);
810 spin_unlock (&ohci->lock);
811 if (HC_IS_RUNNING(hcd->state))
812 ohci_writel (ohci, OHCI_INTR_WDH, &regs->intrenable);
813 }
814
815 if (quirk_zfmicro(ohci) && (ints & OHCI_INTR_SF)) {
816 spin_lock(&ohci->lock);
817 if (ohci->ed_to_check) {
818 struct ed *ed = ohci->ed_to_check;
819
820 if (check_ed(ohci, ed)) {
821 /* HC thinks the TD list is empty; HCD knows
822 * at least one TD is outstanding
823 */
824 if (--ohci->zf_delay == 0) {
825 struct td *td = list_entry(
826 ed->td_list.next,
827 struct td, td_list);
828 ohci_warn(ohci,
829 "Reclaiming orphan TD %p\n",
830 td);
831 takeback_td(ohci, td);
832 ohci->ed_to_check = NULL;
833 }
834 } else
835 ohci->ed_to_check = NULL;
836 }
837 spin_unlock(&ohci->lock);
838 }
839
840 /* could track INTR_SO to reduce available PCI/... bandwidth */
841
842 /* handle any pending URB/ED unlinks, leaving INTR_SF enabled
843 * when there's still unlinking to be done (next frame).
844 */
845 spin_lock (&ohci->lock);
846 if (ohci->ed_rm_list)
847 finish_unlinks (ohci, ohci_frame_no(ohci));
848 if ((ints & OHCI_INTR_SF) != 0
849 && !ohci->ed_rm_list
850 && !ohci->ed_to_check
851 && HC_IS_RUNNING(hcd->state))
852 ohci_writel (ohci, OHCI_INTR_SF, &regs->intrdisable);
853 spin_unlock (&ohci->lock);
854
855 if (HC_IS_RUNNING(hcd->state)) {
856 ohci_writel (ohci, ints, &regs->intrstatus);
857 ohci_writel (ohci, OHCI_INTR_MIE, &regs->intrenable);
858 // flush those writes
859 (void) ohci_readl (ohci, &ohci->regs->control);
860 }
861
862 return IRQ_HANDLED;
863 }
864
865 /*-------------------------------------------------------------------------*/
866
867 static void ohci_stop (struct usb_hcd *hcd)
868 {
869 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
870
871 ohci_dump (ohci, 1);
872
873 flush_scheduled_work();
874
875 ohci_usb_reset (ohci);
876 ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
877 free_irq(hcd->irq, hcd);
878 hcd->irq = -1;
879
880 if (quirk_zfmicro(ohci))
881 del_timer(&ohci->unlink_watchdog);
882
883 remove_debug_files (ohci);
884 ohci_mem_cleanup (ohci);
885 if (ohci->hcca) {
886 dma_free_coherent (hcd->self.controller,
887 sizeof *ohci->hcca,
888 ohci->hcca, ohci->hcca_dma);
889 ohci->hcca = NULL;
890 ohci->hcca_dma = 0;
891 }
892 }
893
894 /*-------------------------------------------------------------------------*/
895
896 /* must not be called from interrupt context */
897 static int ohci_restart (struct ohci_hcd *ohci)
898 {
899 int temp;
900 int i;
901 struct urb_priv *priv;
902
903 spin_lock_irq(&ohci->lock);
904 disable (ohci);
905
906 /* Recycle any "live" eds/tds (and urbs). */
907 if (!list_empty (&ohci->pending))
908 ohci_dbg(ohci, "abort schedule...\n");
909 list_for_each_entry (priv, &ohci->pending, pending) {
910 struct urb *urb = priv->td[0]->urb;
911 struct ed *ed = priv->ed;
912
913 switch (ed->state) {
914 case ED_OPER:
915 ed->state = ED_UNLINK;
916 ed->hwINFO |= cpu_to_hc32(ohci, ED_DEQUEUE);
917 ed_deschedule (ohci, ed);
918
919 ed->ed_next = ohci->ed_rm_list;
920 ed->ed_prev = NULL;
921 ohci->ed_rm_list = ed;
922 /* FALLTHROUGH */
923 case ED_UNLINK:
924 break;
925 default:
926 ohci_dbg(ohci, "bogus ed %p state %d\n",
927 ed, ed->state);
928 }
929
930 if (!urb->unlinked)
931 urb->unlinked = -ESHUTDOWN;
932 }
933 finish_unlinks (ohci, 0);
934 spin_unlock_irq(&ohci->lock);
935
936 /* paranoia, in case that didn't work: */
937
938 /* empty the interrupt branches */
939 for (i = 0; i < NUM_INTS; i++) ohci->load [i] = 0;
940 for (i = 0; i < NUM_INTS; i++) ohci->hcca->int_table [i] = 0;
941
942 /* no EDs to remove */
943 ohci->ed_rm_list = NULL;
944
945 /* empty control and bulk lists */
946 ohci->ed_controltail = NULL;
947 ohci->ed_bulktail = NULL;
948
949 if ((temp = ohci_run (ohci)) < 0) {
950 ohci_err (ohci, "can't restart, %d\n", temp);
951 return temp;
952 }
953 ohci_dbg(ohci, "restart complete\n");
954 return 0;
955 }
956
957 /*-------------------------------------------------------------------------*/
958
959 #define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
960
961 MODULE_AUTHOR (DRIVER_AUTHOR);
962 MODULE_DESCRIPTION (DRIVER_INFO);
963 MODULE_LICENSE ("GPL");
964
965 #ifdef CONFIG_PCI
966 #include "ohci-pci.c"
967 #define PCI_DRIVER ohci_pci_driver
968 #endif
969
970 #ifdef CONFIG_SA1111
971 #include "ohci-sa1111.c"
972 #define SA1111_DRIVER ohci_hcd_sa1111_driver
973 #endif
974
975 #ifdef CONFIG_ARCH_S3C2410
976 #include "ohci-s3c2410.c"
977 #define PLATFORM_DRIVER ohci_hcd_s3c2410_driver
978 #endif
979
980 #ifdef CONFIG_ARCH_OMAP
981 #include "ohci-omap.c"
982 #define PLATFORM_DRIVER ohci_hcd_omap_driver
983 #endif
984
985 #ifdef CONFIG_ARCH_LH7A404
986 #include "ohci-lh7a404.c"
987 #define PLATFORM_DRIVER ohci_hcd_lh7a404_driver
988 #endif
989
990 #ifdef CONFIG_PXA27x
991 #include "ohci-pxa27x.c"
992 #define PLATFORM_DRIVER ohci_hcd_pxa27x_driver
993 #endif
994
995 #ifdef CONFIG_ARCH_EP93XX
996 #include "ohci-ep93xx.c"
997 #define PLATFORM_DRIVER ohci_hcd_ep93xx_driver
998 #endif
999
1000 #ifdef CONFIG_SOC_AU1X00
1001 #include "ohci-au1xxx.c"
1002 #define PLATFORM_DRIVER ohci_hcd_au1xxx_driver
1003 #endif
1004
1005 #ifdef CONFIG_PNX8550
1006 #include "ohci-pnx8550.c"
1007 #define PLATFORM_DRIVER ohci_hcd_pnx8550_driver
1008 #endif
1009
1010 #ifdef CONFIG_USB_OHCI_HCD_PPC_SOC
1011 #include "ohci-ppc-soc.c"
1012 #define PLATFORM_DRIVER ohci_hcd_ppc_soc_driver
1013 #endif
1014
1015 #ifdef CONFIG_ARCH_AT91
1016 #include "ohci-at91.c"
1017 #define PLATFORM_DRIVER ohci_hcd_at91_driver
1018 #endif
1019
1020 #ifdef CONFIG_ARCH_PNX4008
1021 #include "ohci-pnx4008.c"
1022 #define PLATFORM_DRIVER usb_hcd_pnx4008_driver
1023 #endif
1024
1025
1026 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF
1027 #include "ohci-ppc-of.c"
1028 #define OF_PLATFORM_DRIVER ohci_hcd_ppc_of_driver
1029 #endif
1030
1031 #ifdef CONFIG_PPC_PS3
1032 #include "ohci-ps3.c"
1033 #define PS3_SYSTEM_BUS_DRIVER ps3_ohci_driver
1034 #endif
1035
1036 #ifdef CONFIG_USB_OHCI_HCD_SSB
1037 #include "ohci-ssb.c"
1038 #define SSB_OHCI_DRIVER ssb_ohci_driver
1039 #endif
1040
1041 #if !defined(PCI_DRIVER) && \
1042 !defined(PLATFORM_DRIVER) && \
1043 !defined(OF_PLATFORM_DRIVER) && \
1044 !defined(SA1111_DRIVER) && \
1045 !defined(PS3_SYSTEM_BUS_DRIVER) && \
1046 !defined(SSB_OHCI_DRIVER)
1047 #error "missing bus glue for ohci-hcd"
1048 #endif
1049
1050 static int __init ohci_hcd_mod_init(void)
1051 {
1052 int retval = 0;
1053
1054 if (usb_disabled())
1055 return -ENODEV;
1056
1057 printk (KERN_DEBUG "%s: " DRIVER_INFO "\n", hcd_name);
1058 pr_debug ("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
1059 sizeof (struct ed), sizeof (struct td));
1060
1061 #ifdef PS3_SYSTEM_BUS_DRIVER
1062 retval = ps3_ohci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1063 if (retval < 0)
1064 goto error_ps3;
1065 #endif
1066
1067 #ifdef PLATFORM_DRIVER
1068 retval = platform_driver_register(&PLATFORM_DRIVER);
1069 if (retval < 0)
1070 goto error_platform;
1071 #endif
1072
1073 #ifdef OF_PLATFORM_DRIVER
1074 retval = of_register_platform_driver(&OF_PLATFORM_DRIVER);
1075 if (retval < 0)
1076 goto error_of_platform;
1077 #endif
1078
1079 #ifdef SA1111_DRIVER
1080 retval = sa1111_driver_register(&SA1111_DRIVER);
1081 if (retval < 0)
1082 goto error_sa1111;
1083 #endif
1084
1085 #ifdef PCI_DRIVER
1086 retval = pci_register_driver(&PCI_DRIVER);
1087 if (retval < 0)
1088 goto error_pci;
1089 #endif
1090
1091 #ifdef SSB_OHCI_DRIVER
1092 retval = ssb_driver_register(&SSB_OHCI_DRIVER);
1093 if (retval)
1094 goto error_ssb;
1095 #endif
1096
1097 return retval;
1098
1099 /* Error path */
1100 #ifdef SSB_OHCI_DRIVER
1101 error_ssb:
1102 #endif
1103 #ifdef PCI_DRIVER
1104 pci_unregister_driver(&PCI_DRIVER);
1105 error_pci:
1106 #endif
1107 #ifdef SA1111_DRIVER
1108 sa1111_driver_unregister(&SA1111_DRIVER);
1109 error_sa1111:
1110 #endif
1111 #ifdef OF_PLATFORM_DRIVER
1112 of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
1113 error_of_platform:
1114 #endif
1115 #ifdef PLATFORM_DRIVER
1116 platform_driver_unregister(&PLATFORM_DRIVER);
1117 error_platform:
1118 #endif
1119 #ifdef PS3_SYSTEM_BUS_DRIVER
1120 ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1121 error_ps3:
1122 #endif
1123 return retval;
1124 }
1125 module_init(ohci_hcd_mod_init);
1126
1127 static void __exit ohci_hcd_mod_exit(void)
1128 {
1129 #ifdef SSB_OHCI_DRIVER
1130 ssb_driver_unregister(&SSB_OHCI_DRIVER);
1131 #endif
1132 #ifdef PCI_DRIVER
1133 pci_unregister_driver(&PCI_DRIVER);
1134 #endif
1135 #ifdef SA1111_DRIVER
1136 sa1111_driver_unregister(&SA1111_DRIVER);
1137 #endif
1138 #ifdef OF_PLATFORM_DRIVER
1139 of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
1140 #endif
1141 #ifdef PLATFORM_DRIVER
1142 platform_driver_unregister(&PLATFORM_DRIVER);
1143 #endif
1144 #ifdef PS3_SYSTEM_BUS_DRIVER
1145 ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1146 #endif
1147 }
1148 module_exit(ohci_hcd_mod_exit);
1149
Linux kernel - Deliverables
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