1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3 * Open Host Controller Interface (OHCI) driver for USB.
4 *
5 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
6 *
7 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
8 * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
9 *
10 * [ Initialisation is based on Linus' ]
11 * [ uhci code and gregs ohci fragments ]
12 * [ (C) Copyright 1999 Linus Torvalds ]
13 * [ (C) Copyright 1999 Gregory P. Smith]
14 *
15 *
16 * OHCI is the main "non-Intel/VIA" standard for USB 1.1 host controller
17 * interfaces (though some non-x86 Intel chips use it). It supports
18 * smarter hardware than UHCI. A download link for the spec available
19 * through the https://www.usb.org website.
20 *
21 * This file is licenced under the GPL.
22 */
23
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/pci.h>
27 #include <linux/kernel.h>
28 #include <linux/delay.h>
29 #include <linux/ioport.h>
30 #include <linux/sched.h>
31 #include <linux/slab.h>
32 #include <linux/errno.h>
33 #include <linux/init.h>
34 #include <linux/timer.h>
35 #include <linux/list.h>
36 #include <linux/usb.h>
37 #include <linux/usb/otg.h>
38 #include <linux/usb/hcd.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/dmapool.h>
41 #include <linux/workqueue.h>
42 #include <linux/debugfs.h>
43 #include <linux/genalloc.h>
44
45 #include <asm/io.h>
46 #include <asm/irq.h>
47 #include <asm/unaligned.h>
48 #include <asm/byteorder.h>
49
50
51 #define DRIVER_AUTHOR "Roman Weissgaerber, David Brownell"
52 #define DRIVER_DESC "USB 1.1 'Open' Host Controller (OHCI) Driver"
53
54 /*-------------------------------------------------------------------------*/
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 #define IO_WATCHDOG_DELAY msecs_to_jiffies(275)
78 #define IO_WATCHDOG_OFF 0xffffff00
79
80 #include "ohci.h"
81 #include "pci-quirks.h"
82
83 static void ohci_dump(struct ohci_hcd *ohci);
84 static void ohci_stop(struct usb_hcd *hcd);
85 static void io_watchdog_func(struct timer_list *t);
86
87 #include "ohci-hub.c"
88 #include "ohci-dbg.c"
89 #include "ohci-mem.c"
90 #include "ohci-q.c"
91
92
93 /*
94 * On architectures with edge-triggered interrupts we must never return
95 * IRQ_NONE.
96 */
97 #if defined(CONFIG_SA1111) /* ... or other edge-triggered systems */
98 #define IRQ_NOTMINE IRQ_HANDLED
99 #else
100 #define IRQ_NOTMINE IRQ_NONE
101 #endif
102
103
104 /* Some boards misreport power switching/overcurrent */
105 static bool distrust_firmware;
106 module_param (distrust_firmware, bool, 0);
107 MODULE_PARM_DESC (distrust_firmware,
108 "true to distrust firmware power/overcurrent setup");
109
110 /* Some boards leave IR set wrongly, since they fail BIOS/SMM handshakes */
111 static bool no_handshake;
112 module_param (no_handshake, bool, 0);
113 MODULE_PARM_DESC (no_handshake, "true (not default) disables BIOS handshake");
114
115 /*-------------------------------------------------------------------------*/
116
number_of_tds(struct urb * urb)117 static int number_of_tds(struct urb *urb)
118 {
119 int len, i, num, this_sg_len;
120 struct scatterlist *sg;
121
122 len = urb->transfer_buffer_length;
123 i = urb->num_mapped_sgs;
124
125 if (len > 0 && i > 0) { /* Scatter-gather transfer */
126 num = 0;
127 sg = urb->sg;
128 for (;;) {
129 this_sg_len = min_t(int, sg_dma_len(sg), len);
130 num += DIV_ROUND_UP(this_sg_len, 4096);
131 len -= this_sg_len;
132 if (--i <= 0 || len <= 0)
133 break;
134 sg = sg_next(sg);
135 }
136
137 } else { /* Non-SG transfer */
138 /* one TD for every 4096 Bytes (could be up to 8K) */
139 num = DIV_ROUND_UP(len, 4096);
140 }
141 return num;
142 }
143
144 /*
145 * queue up an urb for anything except the root hub
146 */
ohci_urb_enqueue(struct usb_hcd * hcd,struct urb * urb,gfp_t mem_flags)147 static int ohci_urb_enqueue (
148 struct usb_hcd *hcd,
149 struct urb *urb,
150 gfp_t mem_flags
151 ) {
152 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
153 struct ed *ed;
154 urb_priv_t *urb_priv;
155 unsigned int pipe = urb->pipe;
156 int i, size = 0;
157 unsigned long flags;
158 int retval = 0;
159
160 /* every endpoint has a ed, locate and maybe (re)initialize it */
161 ed = ed_get(ohci, urb->ep, urb->dev, pipe, urb->interval);
162 if (! ed)
163 return -ENOMEM;
164
165 /* for the private part of the URB we need the number of TDs (size) */
166 switch (ed->type) {
167 case PIPE_CONTROL:
168 /* td_submit_urb() doesn't yet handle these */
169 if (urb->transfer_buffer_length > 4096)
170 return -EMSGSIZE;
171
172 /* 1 TD for setup, 1 for ACK, plus ... */
173 size = 2;
174 /* FALLTHROUGH */
175 // case PIPE_INTERRUPT:
176 // case PIPE_BULK:
177 default:
178 size += number_of_tds(urb);
179 /* maybe a zero-length packet to wrap it up */
180 if (size == 0)
181 size++;
182 else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
183 && (urb->transfer_buffer_length
184 % usb_maxpacket (urb->dev, pipe,
185 usb_pipeout (pipe))) == 0)
186 size++;
187 break;
188 case PIPE_ISOCHRONOUS: /* number of packets from URB */
189 size = urb->number_of_packets;
190 break;
191 }
192
193 /* allocate the private part of the URB */
194 urb_priv = kzalloc (sizeof (urb_priv_t) + size * sizeof (struct td *),
195 mem_flags);
196 if (!urb_priv)
197 return -ENOMEM;
198 INIT_LIST_HEAD (&urb_priv->pending);
199 urb_priv->length = size;
200 urb_priv->ed = ed;
201
202 /* allocate the TDs (deferring hash chain updates) */
203 for (i = 0; i < size; i++) {
204 urb_priv->td [i] = td_alloc (ohci, mem_flags);
205 if (!urb_priv->td [i]) {
206 urb_priv->length = i;
207 urb_free_priv (ohci, urb_priv);
208 return -ENOMEM;
209 }
210 }
211
212 spin_lock_irqsave (&ohci->lock, flags);
213
214 /* don't submit to a dead HC */
215 if (!HCD_HW_ACCESSIBLE(hcd)) {
216 retval = -ENODEV;
217 goto fail;
218 }
219 if (ohci->rh_state != OHCI_RH_RUNNING) {
220 retval = -ENODEV;
221 goto fail;
222 }
223 retval = usb_hcd_link_urb_to_ep(hcd, urb);
224 if (retval)
225 goto fail;
226
227 /* schedule the ed if needed */
228 if (ed->state == ED_IDLE) {
229 retval = ed_schedule (ohci, ed);
230 if (retval < 0) {
231 usb_hcd_unlink_urb_from_ep(hcd, urb);
232 goto fail;
233 }
234
235 /* Start up the I/O watchdog timer, if it's not running */
236 if (ohci->prev_frame_no == IO_WATCHDOG_OFF &&
237 list_empty(&ohci->eds_in_use) &&
238 !(ohci->flags & OHCI_QUIRK_QEMU)) {
239 ohci->prev_frame_no = ohci_frame_no(ohci);
240 mod_timer(&ohci->io_watchdog,
241 jiffies + IO_WATCHDOG_DELAY);
242 }
243 list_add(&ed->in_use_list, &ohci->eds_in_use);
244
245 if (ed->type == PIPE_ISOCHRONOUS) {
246 u16 frame = ohci_frame_no(ohci);
247
248 /* delay a few frames before the first TD */
249 frame += max_t (u16, 8, ed->interval);
250 frame &= ~(ed->interval - 1);
251 frame |= ed->branch;
252 urb->start_frame = frame;
253 ed->last_iso = frame + ed->interval * (size - 1);
254 }
255 } else if (ed->type == PIPE_ISOCHRONOUS) {
256 u16 next = ohci_frame_no(ohci) + 1;
257 u16 frame = ed->last_iso + ed->interval;
258 u16 length = ed->interval * (size - 1);
259
260 /* Behind the scheduling threshold? */
261 if (unlikely(tick_before(frame, next))) {
262
263 /* URB_ISO_ASAP: Round up to the first available slot */
264 if (urb->transfer_flags & URB_ISO_ASAP) {
265 frame += (next - frame + ed->interval - 1) &
266 -ed->interval;
267
268 /*
269 * Not ASAP: Use the next slot in the stream,
270 * no matter what.
271 */
272 } else {
273 /*
274 * Some OHCI hardware doesn't handle late TDs
275 * correctly. After retiring them it proceeds
276 * to the next ED instead of the next TD.
277 * Therefore we have to omit the late TDs
278 * entirely.
279 */
280 urb_priv->td_cnt = DIV_ROUND_UP(
281 (u16) (next - frame),
282 ed->interval);
283 if (urb_priv->td_cnt >= urb_priv->length) {
284 ++urb_priv->td_cnt; /* Mark it */
285 ohci_dbg(ohci, "iso underrun %p (%u+%u < %u)\n",
286 urb, frame, length,
287 next);
288 }
289 }
290 }
291 urb->start_frame = frame;
292 ed->last_iso = frame + length;
293 }
294
295 /* fill the TDs and link them to the ed; and
296 * enable that part of the schedule, if needed
297 * and update count of queued periodic urbs
298 */
299 urb->hcpriv = urb_priv;
300 td_submit_urb (ohci, urb);
301
302 fail:
303 if (retval)
304 urb_free_priv (ohci, urb_priv);
305 spin_unlock_irqrestore (&ohci->lock, flags);
306 return retval;
307 }
308
309 /*
310 * decouple the URB from the HC queues (TDs, urb_priv).
311 * reporting is always done
312 * asynchronously, and we might be dealing with an urb that's
313 * partially transferred, or an ED with other urbs being unlinked.
314 */
ohci_urb_dequeue(struct usb_hcd * hcd,struct urb * urb,int status)315 static int ohci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
316 {
317 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
318 unsigned long flags;
319 int rc;
320 urb_priv_t *urb_priv;
321
322 spin_lock_irqsave (&ohci->lock, flags);
323 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
324 if (rc == 0) {
325
326 /* Unless an IRQ completed the unlink while it was being
327 * handed to us, flag it for unlink and giveback, and force
328 * some upcoming INTR_SF to call finish_unlinks()
329 */
330 urb_priv = urb->hcpriv;
331 if (urb_priv->ed->state == ED_OPER)
332 start_ed_unlink(ohci, urb_priv->ed);
333
334 if (ohci->rh_state != OHCI_RH_RUNNING) {
335 /* With HC dead, we can clean up right away */
336 ohci_work(ohci);
337 }
338 }
339 spin_unlock_irqrestore (&ohci->lock, flags);
340 return rc;
341 }
342
343 /*-------------------------------------------------------------------------*/
344
345 /* frees config/altsetting state for endpoints,
346 * including ED memory, dummy TD, and bulk/intr data toggle
347 */
348
349 static void
ohci_endpoint_disable(struct usb_hcd * hcd,struct usb_host_endpoint * ep)350 ohci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
351 {
352 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
353 unsigned long flags;
354 struct ed *ed = ep->hcpriv;
355 unsigned limit = 1000;
356
357 /* ASSERT: any requests/urbs are being unlinked */
358 /* ASSERT: nobody can be submitting urbs for this any more */
359
360 if (!ed)
361 return;
362
363 rescan:
364 spin_lock_irqsave (&ohci->lock, flags);
365
366 if (ohci->rh_state != OHCI_RH_RUNNING) {
367 sanitize:
368 ed->state = ED_IDLE;
369 ohci_work(ohci);
370 }
371
372 switch (ed->state) {
373 case ED_UNLINK: /* wait for hw to finish? */
374 /* major IRQ delivery trouble loses INTR_SF too... */
375 if (limit-- == 0) {
376 ohci_warn(ohci, "ED unlink timeout\n");
377 goto sanitize;
378 }
379 spin_unlock_irqrestore (&ohci->lock, flags);
380 schedule_timeout_uninterruptible(1);
381 goto rescan;
382 case ED_IDLE: /* fully unlinked */
383 if (list_empty (&ed->td_list)) {
384 td_free (ohci, ed->dummy);
385 ed_free (ohci, ed);
386 break;
387 }
388 fallthrough;
389 default:
390 /* caller was supposed to have unlinked any requests;
391 * that's not our job. can't recover; must leak ed.
392 */
393 ohci_err (ohci, "leak ed %p (#%02x) state %d%s\n",
394 ed, ep->desc.bEndpointAddress, ed->state,
395 list_empty (&ed->td_list) ? "" : " (has tds)");
396 td_free (ohci, ed->dummy);
397 break;
398 }
399 ep->hcpriv = NULL;
400 spin_unlock_irqrestore (&ohci->lock, flags);
401 }
402
ohci_get_frame(struct usb_hcd * hcd)403 static int ohci_get_frame (struct usb_hcd *hcd)
404 {
405 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
406
407 return ohci_frame_no(ohci);
408 }
409
ohci_usb_reset(struct ohci_hcd * ohci)410 static void ohci_usb_reset (struct ohci_hcd *ohci)
411 {
412 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
413 ohci->hc_control &= OHCI_CTRL_RWC;
414 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
415 ohci->rh_state = OHCI_RH_HALTED;
416 }
417
418 /* ohci_shutdown forcibly disables IRQs and DMA, helping kexec and
419 * other cases where the next software may expect clean state from the
420 * "firmware". this is bus-neutral, unlike shutdown() methods.
421 */
_ohci_shutdown(struct usb_hcd * hcd)422 static void _ohci_shutdown(struct usb_hcd *hcd)
423 {
424 struct ohci_hcd *ohci;
425
426 ohci = hcd_to_ohci (hcd);
427 ohci_writel(ohci, (u32) ~0, &ohci->regs->intrdisable);
428
429 /* Software reset, after which the controller goes into SUSPEND */
430 ohci_writel(ohci, OHCI_HCR, &ohci->regs->cmdstatus);
431 ohci_readl(ohci, &ohci->regs->cmdstatus); /* flush the writes */
432 udelay(10);
433
434 ohci_writel(ohci, ohci->fminterval, &ohci->regs->fminterval);
435 ohci->rh_state = OHCI_RH_HALTED;
436 }
437
ohci_shutdown(struct usb_hcd * hcd)438 static void ohci_shutdown(struct usb_hcd *hcd)
439 {
440 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
441 unsigned long flags;
442
443 spin_lock_irqsave(&ohci->lock, flags);
444 _ohci_shutdown(hcd);
445 spin_unlock_irqrestore(&ohci->lock, flags);
446 }
447
448 /*-------------------------------------------------------------------------*
449 * HC functions
450 *-------------------------------------------------------------------------*/
451
452 /* init memory, and kick BIOS/SMM off */
453
ohci_init(struct ohci_hcd * ohci)454 static int ohci_init (struct ohci_hcd *ohci)
455 {
456 int ret;
457 struct usb_hcd *hcd = ohci_to_hcd(ohci);
458
459 /* Accept arbitrarily long scatter-gather lists */
460 if (!hcd->localmem_pool)
461 hcd->self.sg_tablesize = ~0;
462
463 if (distrust_firmware)
464 ohci->flags |= OHCI_QUIRK_HUB_POWER;
465
466 ohci->rh_state = OHCI_RH_HALTED;
467 ohci->regs = hcd->regs;
468
469 /* REVISIT this BIOS handshake is now moved into PCI "quirks", and
470 * was never needed for most non-PCI systems ... remove the code?
471 */
472
473 #ifndef IR_DISABLE
474 /* SMM owns the HC? not for long! */
475 if (!no_handshake && ohci_readl (ohci,
476 &ohci->regs->control) & OHCI_CTRL_IR) {
477 u32 temp;
478
479 ohci_dbg (ohci, "USB HC TakeOver from BIOS/SMM\n");
480
481 /* this timeout is arbitrary. we make it long, so systems
482 * depending on usb keyboards may be usable even if the
483 * BIOS/SMM code seems pretty broken.
484 */
485 temp = 500; /* arbitrary: five seconds */
486
487 ohci_writel (ohci, OHCI_INTR_OC, &ohci->regs->intrenable);
488 ohci_writel (ohci, OHCI_OCR, &ohci->regs->cmdstatus);
489 while (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_IR) {
490 msleep (10);
491 if (--temp == 0) {
492 ohci_err (ohci, "USB HC takeover failed!"
493 " (BIOS/SMM bug)\n");
494 return -EBUSY;
495 }
496 }
497 ohci_usb_reset (ohci);
498 }
499 #endif
500
501 /* Disable HC interrupts */
502 ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
503
504 /* flush the writes, and save key bits like RWC */
505 if (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_RWC)
506 ohci->hc_control |= OHCI_CTRL_RWC;
507
508 /* Read the number of ports unless overridden */
509 if (ohci->num_ports == 0)
510 ohci->num_ports = roothub_a(ohci) & RH_A_NDP;
511
512 if (ohci->hcca)
513 return 0;
514
515 timer_setup(&ohci->io_watchdog, io_watchdog_func, 0);
516 ohci->prev_frame_no = IO_WATCHDOG_OFF;
517
518 if (hcd->localmem_pool)
519 ohci->hcca = gen_pool_dma_alloc_align(hcd->localmem_pool,
520 sizeof(*ohci->hcca),
521 &ohci->hcca_dma, 256);
522 else
523 ohci->hcca = dma_alloc_coherent(hcd->self.controller,
524 sizeof(*ohci->hcca),
525 &ohci->hcca_dma,
526 GFP_KERNEL);
527 if (!ohci->hcca)
528 return -ENOMEM;
529
530 if ((ret = ohci_mem_init (ohci)) < 0)
531 ohci_stop (hcd);
532 else {
533 create_debug_files (ohci);
534 }
535
536 return ret;
537 }
538
539 /*-------------------------------------------------------------------------*/
540
541 /* Start an OHCI controller, set the BUS operational
542 * resets USB and controller
543 * enable interrupts
544 */
ohci_run(struct ohci_hcd * ohci)545 static int ohci_run (struct ohci_hcd *ohci)
546 {
547 u32 mask, val;
548 int first = ohci->fminterval == 0;
549 struct usb_hcd *hcd = ohci_to_hcd(ohci);
550
551 ohci->rh_state = OHCI_RH_HALTED;
552
553 /* boot firmware should have set this up (5.1.1.3.1) */
554 if (first) {
555
556 val = ohci_readl (ohci, &ohci->regs->fminterval);
557 ohci->fminterval = val & 0x3fff;
558 if (ohci->fminterval != FI)
559 ohci_dbg (ohci, "fminterval delta %d\n",
560 ohci->fminterval - FI);
561 ohci->fminterval |= FSMP (ohci->fminterval) << 16;
562 /* also: power/overcurrent flags in roothub.a */
563 }
564
565 /* Reset USB nearly "by the book". RemoteWakeupConnected has
566 * to be checked in case boot firmware (BIOS/SMM/...) has set up
567 * wakeup in a way the bus isn't aware of (e.g., legacy PCI PM).
568 * If the bus glue detected wakeup capability then it should
569 * already be enabled; if so we'll just enable it again.
570 */
571 if ((ohci->hc_control & OHCI_CTRL_RWC) != 0)
572 device_set_wakeup_capable(hcd->self.controller, 1);
573
574 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
575 case OHCI_USB_OPER:
576 val = 0;
577 break;
578 case OHCI_USB_SUSPEND:
579 case OHCI_USB_RESUME:
580 ohci->hc_control &= OHCI_CTRL_RWC;
581 ohci->hc_control |= OHCI_USB_RESUME;
582 val = 10 /* msec wait */;
583 break;
584 // case OHCI_USB_RESET:
585 default:
586 ohci->hc_control &= OHCI_CTRL_RWC;
587 ohci->hc_control |= OHCI_USB_RESET;
588 val = 50 /* msec wait */;
589 break;
590 }
591 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
592 // flush the writes
593 (void) ohci_readl (ohci, &ohci->regs->control);
594 msleep(val);
595
596 memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
597
598 /* 2msec timelimit here means no irqs/preempt */
599 spin_lock_irq (&ohci->lock);
600
601 retry:
602 /* HC Reset requires max 10 us delay */
603 ohci_writel (ohci, OHCI_HCR, &ohci->regs->cmdstatus);
604 val = 30; /* ... allow extra time */
605 while ((ohci_readl (ohci, &ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
606 if (--val == 0) {
607 spin_unlock_irq (&ohci->lock);
608 ohci_err (ohci, "USB HC reset timed out!\n");
609 return -1;
610 }
611 udelay (1);
612 }
613
614 /* now we're in the SUSPEND state ... must go OPERATIONAL
615 * within 2msec else HC enters RESUME
616 *
617 * ... but some hardware won't init fmInterval "by the book"
618 * (SiS, OPTi ...), so reset again instead. SiS doesn't need
619 * this if we write fmInterval after we're OPERATIONAL.
620 * Unclear about ALi, ServerWorks, and others ... this could
621 * easily be a longstanding bug in chip init on Linux.
622 */
623 if (ohci->flags & OHCI_QUIRK_INITRESET) {
624 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
625 // flush those writes
626 (void) ohci_readl (ohci, &ohci->regs->control);
627 }
628
629 /* Tell the controller where the control and bulk lists are
630 * The lists are empty now. */
631 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
632 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
633
634 /* a reset clears this */
635 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
636
637 periodic_reinit (ohci);
638
639 /* some OHCI implementations are finicky about how they init.
640 * bogus values here mean not even enumeration could work.
641 */
642 if ((ohci_readl (ohci, &ohci->regs->fminterval) & 0x3fff0000) == 0
643 || !ohci_readl (ohci, &ohci->regs->periodicstart)) {
644 if (!(ohci->flags & OHCI_QUIRK_INITRESET)) {
645 ohci->flags |= OHCI_QUIRK_INITRESET;
646 ohci_dbg (ohci, "enabling initreset quirk\n");
647 goto retry;
648 }
649 spin_unlock_irq (&ohci->lock);
650 ohci_err (ohci, "init err (%08x %04x)\n",
651 ohci_readl (ohci, &ohci->regs->fminterval),
652 ohci_readl (ohci, &ohci->regs->periodicstart));
653 return -EOVERFLOW;
654 }
655
656 /* use rhsc irqs after hub_wq is allocated */
657 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
658 hcd->uses_new_polling = 1;
659
660 /* start controller operations */
661 ohci->hc_control &= OHCI_CTRL_RWC;
662 ohci->hc_control |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
663 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
664 ohci->rh_state = OHCI_RH_RUNNING;
665
666 /* wake on ConnectStatusChange, matching external hubs */
667 ohci_writel (ohci, RH_HS_DRWE, &ohci->regs->roothub.status);
668
669 /* Choose the interrupts we care about now, others later on demand */
670 mask = OHCI_INTR_INIT;
671 ohci_writel (ohci, ~0, &ohci->regs->intrstatus);
672 ohci_writel (ohci, mask, &ohci->regs->intrenable);
673
674 /* handle root hub init quirks ... */
675 val = roothub_a (ohci);
676 /* Configure for per-port over-current protection by default */
677 val &= ~RH_A_NOCP;
678 val |= RH_A_OCPM;
679 if (ohci->flags & OHCI_QUIRK_SUPERIO) {
680 /* NSC 87560 and maybe others.
681 * Ganged power switching, no over-current protection.
682 */
683 val |= RH_A_NOCP;
684 val &= ~(RH_A_POTPGT | RH_A_NPS | RH_A_PSM | RH_A_OCPM);
685 } else if ((ohci->flags & OHCI_QUIRK_AMD756) ||
686 (ohci->flags & OHCI_QUIRK_HUB_POWER)) {
687 /* hub power always on; required for AMD-756 and some
688 * Mac platforms.
689 */
690 val |= RH_A_NPS;
691 }
692 ohci_writel(ohci, val, &ohci->regs->roothub.a);
693
694 ohci_writel (ohci, RH_HS_LPSC, &ohci->regs->roothub.status);
695 ohci_writel (ohci, (val & RH_A_NPS) ? 0 : RH_B_PPCM,
696 &ohci->regs->roothub.b);
697 // flush those writes
698 (void) ohci_readl (ohci, &ohci->regs->control);
699
700 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
701 spin_unlock_irq (&ohci->lock);
702
703 // POTPGT delay is bits 24-31, in 2 ms units.
704 mdelay ((val >> 23) & 0x1fe);
705
706 ohci_dump(ohci);
707
708 return 0;
709 }
710
711 /* ohci_setup routine for generic controller initialization */
712
ohci_setup(struct usb_hcd * hcd)713 int ohci_setup(struct usb_hcd *hcd)
714 {
715 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
716
717 ohci_hcd_init(ohci);
718
719 return ohci_init(ohci);
720 }
721 EXPORT_SYMBOL_GPL(ohci_setup);
722
723 /* ohci_start routine for generic controller start of all OHCI bus glue */
ohci_start(struct usb_hcd * hcd)724 static int ohci_start(struct usb_hcd *hcd)
725 {
726 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
727 int ret;
728
729 ret = ohci_run(ohci);
730 if (ret < 0) {
731 ohci_err(ohci, "can't start\n");
732 ohci_stop(hcd);
733 }
734 return ret;
735 }
736
737 /*-------------------------------------------------------------------------*/
738
739 /*
740 * Some OHCI controllers are known to lose track of completed TDs. They
741 * don't add the TDs to the hardware done queue, which means we never see
742 * them as being completed.
743 *
744 * This watchdog routine checks for such problems. Without some way to
745 * tell when those TDs have completed, we would never take their EDs off
746 * the unlink list. As a result, URBs could never be dequeued and
747 * endpoints could never be released.
748 */
io_watchdog_func(struct timer_list * t)749 static void io_watchdog_func(struct timer_list *t)
750 {
751 struct ohci_hcd *ohci = from_timer(ohci, t, io_watchdog);
752 bool takeback_all_pending = false;
753 u32 status;
754 u32 head;
755 struct ed *ed;
756 struct td *td, *td_start, *td_next;
757 unsigned frame_no, prev_frame_no = IO_WATCHDOG_OFF;
758 unsigned long flags;
759
760 spin_lock_irqsave(&ohci->lock, flags);
761
762 /*
763 * One way to lose track of completed TDs is if the controller
764 * never writes back the done queue head. If it hasn't been
765 * written back since the last time this function ran and if it
766 * was non-empty at that time, something is badly wrong with the
767 * hardware.
768 */
769 status = ohci_readl(ohci, &ohci->regs->intrstatus);
770 if (!(status & OHCI_INTR_WDH) && ohci->wdh_cnt == ohci->prev_wdh_cnt) {
771 if (ohci->prev_donehead) {
772 ohci_err(ohci, "HcDoneHead not written back; disabled\n");
773 died:
774 usb_hc_died(ohci_to_hcd(ohci));
775 ohci_dump(ohci);
776 _ohci_shutdown(ohci_to_hcd(ohci));
777 goto done;
778 } else {
779 /* No write back because the done queue was empty */
780 takeback_all_pending = true;
781 }
782 }
783
784 /* Check every ED which might have pending TDs */
785 list_for_each_entry(ed, &ohci->eds_in_use, in_use_list) {
786 if (ed->pending_td) {
787 if (takeback_all_pending ||
788 OKAY_TO_TAKEBACK(ohci, ed)) {
789 unsigned tmp = hc32_to_cpu(ohci, ed->hwINFO);
790
791 ohci_dbg(ohci, "takeback pending TD for dev %d ep 0x%x\n",
792 0x007f & tmp,
793 (0x000f & (tmp >> 7)) +
794 ((tmp & ED_IN) >> 5));
795 add_to_done_list(ohci, ed->pending_td);
796 }
797 }
798
799 /* Starting from the latest pending TD, */
800 td = ed->pending_td;
801
802 /* or the last TD on the done list, */
803 if (!td) {
804 list_for_each_entry(td_next, &ed->td_list, td_list) {
805 if (!td_next->next_dl_td)
806 break;
807 td = td_next;
808 }
809 }
810
811 /* find the last TD processed by the controller. */
812 head = hc32_to_cpu(ohci, READ_ONCE(ed->hwHeadP)) & TD_MASK;
813 td_start = td;
814 td_next = list_prepare_entry(td, &ed->td_list, td_list);
815 list_for_each_entry_continue(td_next, &ed->td_list, td_list) {
816 if (head == (u32) td_next->td_dma)
817 break;
818 td = td_next; /* head pointer has passed this TD */
819 }
820 if (td != td_start) {
821 /*
822 * In case a WDH cycle is in progress, we will wait
823 * for the next two cycles to complete before assuming
824 * this TD will never get on the done queue.
825 */
826 ed->takeback_wdh_cnt = ohci->wdh_cnt + 2;
827 ed->pending_td = td;
828 }
829 }
830
831 ohci_work(ohci);
832
833 if (ohci->rh_state == OHCI_RH_RUNNING) {
834
835 /*
836 * Sometimes a controller just stops working. We can tell
837 * by checking that the frame counter has advanced since
838 * the last time we ran.
839 *
840 * But be careful: Some controllers violate the spec by
841 * stopping their frame counter when no ports are active.
842 */
843 frame_no = ohci_frame_no(ohci);
844 if (frame_no == ohci->prev_frame_no) {
845 int active_cnt = 0;
846 int i;
847 unsigned tmp;
848
849 for (i = 0; i < ohci->num_ports; ++i) {
850 tmp = roothub_portstatus(ohci, i);
851 /* Enabled and not suspended? */
852 if ((tmp & RH_PS_PES) && !(tmp & RH_PS_PSS))
853 ++active_cnt;
854 }
855
856 if (active_cnt > 0) {
857 ohci_err(ohci, "frame counter not updating; disabled\n");
858 goto died;
859 }
860 }
861 if (!list_empty(&ohci->eds_in_use)) {
862 prev_frame_no = frame_no;
863 ohci->prev_wdh_cnt = ohci->wdh_cnt;
864 ohci->prev_donehead = ohci_readl(ohci,
865 &ohci->regs->donehead);
866 mod_timer(&ohci->io_watchdog,
867 jiffies + IO_WATCHDOG_DELAY);
868 }
869 }
870
871 done:
872 ohci->prev_frame_no = prev_frame_no;
873 spin_unlock_irqrestore(&ohci->lock, flags);
874 }
875
876 /* an interrupt happens */
877
ohci_irq(struct usb_hcd * hcd)878 static irqreturn_t ohci_irq (struct usb_hcd *hcd)
879 {
880 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
881 struct ohci_regs __iomem *regs = ohci->regs;
882 int ints;
883
884 /* Read interrupt status (and flush pending writes). We ignore the
885 * optimization of checking the LSB of hcca->done_head; it doesn't
886 * work on all systems (edge triggering for OHCI can be a factor).
887 */
888 ints = ohci_readl(ohci, ®s->intrstatus);
889
890 /* Check for an all 1's result which is a typical consequence
891 * of dead, unclocked, or unplugged (CardBus...) devices
892 */
893 if (ints == ~(u32)0) {
894 ohci->rh_state = OHCI_RH_HALTED;
895 ohci_dbg (ohci, "device removed!\n");
896 usb_hc_died(hcd);
897 return IRQ_HANDLED;
898 }
899
900 /* We only care about interrupts that are enabled */
901 ints &= ohci_readl(ohci, ®s->intrenable);
902
903 /* interrupt for some other device? */
904 if (ints == 0 || unlikely(ohci->rh_state == OHCI_RH_HALTED))
905 return IRQ_NOTMINE;
906
907 if (ints & OHCI_INTR_UE) {
908 // e.g. due to PCI Master/Target Abort
909 if (quirk_nec(ohci)) {
910 /* Workaround for a silicon bug in some NEC chips used
911 * in Apple's PowerBooks. Adapted from Darwin code.
912 */
913 ohci_err (ohci, "OHCI Unrecoverable Error, scheduling NEC chip restart\n");
914
915 ohci_writel (ohci, OHCI_INTR_UE, ®s->intrdisable);
916
917 schedule_work (&ohci->nec_work);
918 } else {
919 ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
920 ohci->rh_state = OHCI_RH_HALTED;
921 usb_hc_died(hcd);
922 }
923
924 ohci_dump(ohci);
925 ohci_usb_reset (ohci);
926 }
927
928 if (ints & OHCI_INTR_RHSC) {
929 ohci_dbg(ohci, "rhsc\n");
930 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
931 ohci_writel(ohci, OHCI_INTR_RD | OHCI_INTR_RHSC,
932 ®s->intrstatus);
933
934 /* NOTE: Vendors didn't always make the same implementation
935 * choices for RHSC. Many followed the spec; RHSC triggers
936 * on an edge, like setting and maybe clearing a port status
937 * change bit. With others it's level-triggered, active
938 * until hub_wq clears all the port status change bits. We'll
939 * always disable it here and rely on polling until hub_wq
940 * re-enables it.
941 */
942 ohci_writel(ohci, OHCI_INTR_RHSC, ®s->intrdisable);
943 usb_hcd_poll_rh_status(hcd);
944 }
945
946 /* For connect and disconnect events, we expect the controller
947 * to turn on RHSC along with RD. But for remote wakeup events
948 * this might not happen.
949 */
950 else if (ints & OHCI_INTR_RD) {
951 ohci_dbg(ohci, "resume detect\n");
952 ohci_writel(ohci, OHCI_INTR_RD, ®s->intrstatus);
953 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
954 if (ohci->autostop) {
955 spin_lock (&ohci->lock);
956 ohci_rh_resume (ohci);
957 spin_unlock (&ohci->lock);
958 } else
959 usb_hcd_resume_root_hub(hcd);
960 }
961
962 spin_lock(&ohci->lock);
963 if (ints & OHCI_INTR_WDH)
964 update_done_list(ohci);
965
966 /* could track INTR_SO to reduce available PCI/... bandwidth */
967
968 /* handle any pending URB/ED unlinks, leaving INTR_SF enabled
969 * when there's still unlinking to be done (next frame).
970 */
971 ohci_work(ohci);
972 if ((ints & OHCI_INTR_SF) != 0 && !ohci->ed_rm_list
973 && ohci->rh_state == OHCI_RH_RUNNING)
974 ohci_writel (ohci, OHCI_INTR_SF, ®s->intrdisable);
975
976 if (ohci->rh_state == OHCI_RH_RUNNING) {
977 ohci_writel (ohci, ints, ®s->intrstatus);
978 if (ints & OHCI_INTR_WDH)
979 ++ohci->wdh_cnt;
980
981 ohci_writel (ohci, OHCI_INTR_MIE, ®s->intrenable);
982 // flush those writes
983 (void) ohci_readl (ohci, &ohci->regs->control);
984 }
985 spin_unlock(&ohci->lock);
986
987 return IRQ_HANDLED;
988 }
989
990 /*-------------------------------------------------------------------------*/
991
ohci_stop(struct usb_hcd * hcd)992 static void ohci_stop (struct usb_hcd *hcd)
993 {
994 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
995
996 ohci_dump(ohci);
997
998 if (quirk_nec(ohci))
999 flush_work(&ohci->nec_work);
1000 del_timer_sync(&ohci->io_watchdog);
1001 ohci->prev_frame_no = IO_WATCHDOG_OFF;
1002
1003 ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
1004 ohci_usb_reset(ohci);
1005 free_irq(hcd->irq, hcd);
1006 hcd->irq = 0;
1007
1008 if (quirk_amdiso(ohci))
1009 usb_amd_dev_put();
1010
1011 remove_debug_files (ohci);
1012 ohci_mem_cleanup (ohci);
1013 if (ohci->hcca) {
1014 if (hcd->localmem_pool)
1015 gen_pool_free(hcd->localmem_pool,
1016 (unsigned long)ohci->hcca,
1017 sizeof(*ohci->hcca));
1018 else
1019 dma_free_coherent(hcd->self.controller,
1020 sizeof(*ohci->hcca),
1021 ohci->hcca, ohci->hcca_dma);
1022 ohci->hcca = NULL;
1023 ohci->hcca_dma = 0;
1024 }
1025 }
1026
1027 /*-------------------------------------------------------------------------*/
1028
1029 #if defined(CONFIG_PM) || defined(CONFIG_USB_PCI)
1030
1031 /* must not be called from interrupt context */
ohci_restart(struct ohci_hcd * ohci)1032 int ohci_restart(struct ohci_hcd *ohci)
1033 {
1034 int temp;
1035 int i;
1036 struct urb_priv *priv;
1037
1038 ohci_init(ohci);
1039 spin_lock_irq(&ohci->lock);
1040 ohci->rh_state = OHCI_RH_HALTED;
1041
1042 /* Recycle any "live" eds/tds (and urbs). */
1043 if (!list_empty (&ohci->pending))
1044 ohci_dbg(ohci, "abort schedule...\n");
1045 list_for_each_entry (priv, &ohci->pending, pending) {
1046 struct urb *urb = priv->td[0]->urb;
1047 struct ed *ed = priv->ed;
1048
1049 switch (ed->state) {
1050 case ED_OPER:
1051 ed->state = ED_UNLINK;
1052 ed->hwINFO |= cpu_to_hc32(ohci, ED_DEQUEUE);
1053 ed_deschedule (ohci, ed);
1054
1055 ed->ed_next = ohci->ed_rm_list;
1056 ed->ed_prev = NULL;
1057 ohci->ed_rm_list = ed;
1058 fallthrough;
1059 case ED_UNLINK:
1060 break;
1061 default:
1062 ohci_dbg(ohci, "bogus ed %p state %d\n",
1063 ed, ed->state);
1064 }
1065
1066 if (!urb->unlinked)
1067 urb->unlinked = -ESHUTDOWN;
1068 }
1069 ohci_work(ohci);
1070 spin_unlock_irq(&ohci->lock);
1071
1072 /* paranoia, in case that didn't work: */
1073
1074 /* empty the interrupt branches */
1075 for (i = 0; i < NUM_INTS; i++) ohci->load [i] = 0;
1076 for (i = 0; i < NUM_INTS; i++) ohci->hcca->int_table [i] = 0;
1077
1078 /* no EDs to remove */
1079 ohci->ed_rm_list = NULL;
1080
1081 /* empty control and bulk lists */
1082 ohci->ed_controltail = NULL;
1083 ohci->ed_bulktail = NULL;
1084
1085 if ((temp = ohci_run (ohci)) < 0) {
1086 ohci_err (ohci, "can't restart, %d\n", temp);
1087 return temp;
1088 }
1089 ohci_dbg(ohci, "restart complete\n");
1090 return 0;
1091 }
1092 EXPORT_SYMBOL_GPL(ohci_restart);
1093
1094 #endif
1095
1096 #ifdef CONFIG_PM
1097
ohci_suspend(struct usb_hcd * hcd,bool do_wakeup)1098 int ohci_suspend(struct usb_hcd *hcd, bool do_wakeup)
1099 {
1100 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
1101 unsigned long flags;
1102 int rc = 0;
1103
1104 /* Disable irq emission and mark HW unaccessible. Use
1105 * the spinlock to properly synchronize with possible pending
1106 * RH suspend or resume activity.
1107 */
1108 spin_lock_irqsave (&ohci->lock, flags);
1109 ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
1110 (void)ohci_readl(ohci, &ohci->regs->intrdisable);
1111
1112 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1113 spin_unlock_irqrestore (&ohci->lock, flags);
1114
1115 synchronize_irq(hcd->irq);
1116
1117 if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
1118 ohci_resume(hcd, false);
1119 rc = -EBUSY;
1120 }
1121 return rc;
1122 }
1123 EXPORT_SYMBOL_GPL(ohci_suspend);
1124
1125
ohci_resume(struct usb_hcd * hcd,bool hibernated)1126 int ohci_resume(struct usb_hcd *hcd, bool hibernated)
1127 {
1128 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
1129 int port;
1130 bool need_reinit = false;
1131
1132 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1133
1134 /* Make sure resume from hibernation re-enumerates everything */
1135 if (hibernated)
1136 ohci_usb_reset(ohci);
1137
1138 /* See if the controller is already running or has been reset */
1139 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
1140 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
1141 need_reinit = true;
1142 } else {
1143 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
1144 case OHCI_USB_OPER:
1145 case OHCI_USB_RESET:
1146 need_reinit = true;
1147 }
1148 }
1149
1150 /* If needed, reinitialize and suspend the root hub */
1151 if (need_reinit) {
1152 spin_lock_irq(&ohci->lock);
1153 ohci_rh_resume(ohci);
1154 ohci_rh_suspend(ohci, 0);
1155 spin_unlock_irq(&ohci->lock);
1156 }
1157
1158 /* Normally just turn on port power and enable interrupts */
1159 else {
1160 ohci_dbg(ohci, "powerup ports\n");
1161 for (port = 0; port < ohci->num_ports; port++)
1162 ohci_writel(ohci, RH_PS_PPS,
1163 &ohci->regs->roothub.portstatus[port]);
1164
1165 ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
1166 ohci_readl(ohci, &ohci->regs->intrenable);
1167 msleep(20);
1168 }
1169
1170 usb_hcd_resume_root_hub(hcd);
1171
1172 return 0;
1173 }
1174 EXPORT_SYMBOL_GPL(ohci_resume);
1175
1176 #endif
1177
1178 /*-------------------------------------------------------------------------*/
1179
1180 /*
1181 * Generic structure: This gets copied for platform drivers so that
1182 * individual entries can be overridden as needed.
1183 */
1184
1185 static const struct hc_driver ohci_hc_driver = {
1186 .description = hcd_name,
1187 .product_desc = "OHCI Host Controller",
1188 .hcd_priv_size = sizeof(struct ohci_hcd),
1189
1190 /*
1191 * generic hardware linkage
1192 */
1193 .irq = ohci_irq,
1194 .flags = HCD_MEMORY | HCD_DMA | HCD_USB11,
1195
1196 /*
1197 * basic lifecycle operations
1198 */
1199 .reset = ohci_setup,
1200 .start = ohci_start,
1201 .stop = ohci_stop,
1202 .shutdown = ohci_shutdown,
1203
1204 /*
1205 * managing i/o requests and associated device resources
1206 */
1207 .urb_enqueue = ohci_urb_enqueue,
1208 .urb_dequeue = ohci_urb_dequeue,
1209 .endpoint_disable = ohci_endpoint_disable,
1210
1211 /*
1212 * scheduling support
1213 */
1214 .get_frame_number = ohci_get_frame,
1215
1216 /*
1217 * root hub support
1218 */
1219 .hub_status_data = ohci_hub_status_data,
1220 .hub_control = ohci_hub_control,
1221 #ifdef CONFIG_PM
1222 .bus_suspend = ohci_bus_suspend,
1223 .bus_resume = ohci_bus_resume,
1224 #endif
1225 .start_port_reset = ohci_start_port_reset,
1226 };
1227
ohci_init_driver(struct hc_driver * drv,const struct ohci_driver_overrides * over)1228 void ohci_init_driver(struct hc_driver *drv,
1229 const struct ohci_driver_overrides *over)
1230 {
1231 /* Copy the generic table to drv and then apply the overrides */
1232 *drv = ohci_hc_driver;
1233
1234 if (over) {
1235 drv->product_desc = over->product_desc;
1236 drv->hcd_priv_size += over->extra_priv_size;
1237 if (over->reset)
1238 drv->reset = over->reset;
1239 }
1240 }
1241 EXPORT_SYMBOL_GPL(ohci_init_driver);
1242
1243 /*-------------------------------------------------------------------------*/
1244
1245 MODULE_AUTHOR (DRIVER_AUTHOR);
1246 MODULE_DESCRIPTION(DRIVER_DESC);
1247 MODULE_LICENSE ("GPL");
1248
1249 #if defined(CONFIG_ARCH_SA1100) && defined(CONFIG_SA1111)
1250 #include "ohci-sa1111.c"
1251 #define SA1111_DRIVER ohci_hcd_sa1111_driver
1252 #endif
1253
1254 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF
1255 #include "ohci-ppc-of.c"
1256 #define OF_PLATFORM_DRIVER ohci_hcd_ppc_of_driver
1257 #endif
1258
1259 #ifdef CONFIG_PPC_PS3
1260 #include "ohci-ps3.c"
1261 #define PS3_SYSTEM_BUS_DRIVER ps3_ohci_driver
1262 #endif
1263
1264 #ifdef CONFIG_MFD_SM501
1265 #include "ohci-sm501.c"
1266 #define SM501_OHCI_DRIVER ohci_hcd_sm501_driver
1267 #endif
1268
1269 #ifdef CONFIG_MFD_TC6393XB
1270 #include "ohci-tmio.c"
1271 #define TMIO_OHCI_DRIVER ohci_hcd_tmio_driver
1272 #endif
1273
ohci_hcd_mod_init(void)1274 static int __init ohci_hcd_mod_init(void)
1275 {
1276 int retval = 0;
1277
1278 if (usb_disabled())
1279 return -ENODEV;
1280
1281 printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
1282 pr_debug ("%s: block sizes: ed %zd td %zd\n", hcd_name,
1283 sizeof (struct ed), sizeof (struct td));
1284 set_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
1285
1286 ohci_debug_root = debugfs_create_dir("ohci", usb_debug_root);
1287
1288 #ifdef PS3_SYSTEM_BUS_DRIVER
1289 retval = ps3_ohci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1290 if (retval < 0)
1291 goto error_ps3;
1292 #endif
1293
1294 #ifdef OF_PLATFORM_DRIVER
1295 retval = platform_driver_register(&OF_PLATFORM_DRIVER);
1296 if (retval < 0)
1297 goto error_of_platform;
1298 #endif
1299
1300 #ifdef SA1111_DRIVER
1301 retval = sa1111_driver_register(&SA1111_DRIVER);
1302 if (retval < 0)
1303 goto error_sa1111;
1304 #endif
1305
1306 #ifdef SM501_OHCI_DRIVER
1307 retval = platform_driver_register(&SM501_OHCI_DRIVER);
1308 if (retval < 0)
1309 goto error_sm501;
1310 #endif
1311
1312 #ifdef TMIO_OHCI_DRIVER
1313 retval = platform_driver_register(&TMIO_OHCI_DRIVER);
1314 if (retval < 0)
1315 goto error_tmio;
1316 #endif
1317
1318 return retval;
1319
1320 /* Error path */
1321 #ifdef TMIO_OHCI_DRIVER
1322 platform_driver_unregister(&TMIO_OHCI_DRIVER);
1323 error_tmio:
1324 #endif
1325 #ifdef SM501_OHCI_DRIVER
1326 platform_driver_unregister(&SM501_OHCI_DRIVER);
1327 error_sm501:
1328 #endif
1329 #ifdef SA1111_DRIVER
1330 sa1111_driver_unregister(&SA1111_DRIVER);
1331 error_sa1111:
1332 #endif
1333 #ifdef OF_PLATFORM_DRIVER
1334 platform_driver_unregister(&OF_PLATFORM_DRIVER);
1335 error_of_platform:
1336 #endif
1337 #ifdef PS3_SYSTEM_BUS_DRIVER
1338 ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1339 error_ps3:
1340 #endif
1341 debugfs_remove(ohci_debug_root);
1342 ohci_debug_root = NULL;
1343
1344 clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
1345 return retval;
1346 }
1347 module_init(ohci_hcd_mod_init);
1348
ohci_hcd_mod_exit(void)1349 static void __exit ohci_hcd_mod_exit(void)
1350 {
1351 #ifdef TMIO_OHCI_DRIVER
1352 platform_driver_unregister(&TMIO_OHCI_DRIVER);
1353 #endif
1354 #ifdef SM501_OHCI_DRIVER
1355 platform_driver_unregister(&SM501_OHCI_DRIVER);
1356 #endif
1357 #ifdef SA1111_DRIVER
1358 sa1111_driver_unregister(&SA1111_DRIVER);
1359 #endif
1360 #ifdef OF_PLATFORM_DRIVER
1361 platform_driver_unregister(&OF_PLATFORM_DRIVER);
1362 #endif
1363 #ifdef PS3_SYSTEM_BUS_DRIVER
1364 ps3_ohci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1365 #endif
1366 debugfs_remove(ohci_debug_root);
1367 clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
1368 }
1369 module_exit(ohci_hcd_mod_exit);
1370
1371