[adm5120] license cleanup
[openwrt.git] / target / linux / adm5120 / files / drivers / usb / host / adm5120-hcd.c
1 /*
2  * ADM5120 HCD (Host Controller Driver) for USB
3  *
4  * Copyright (C) 2007,2008 Gabor Juhos <juhosg at openwrt.org>
5  *
6  * This file was derived from: drivers/usb/host/ohci-hcd.c
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 ahcd fragments ]
12  *   [ (C) Copyright 1999 Linus Torvalds  ]
13  *   [ (C) Copyright 1999 Gregory P. Smith]
14  *
15  *  This program is free software; you can redistribute it and/or modify it
16  *  under the terms of the GNU General Public License version 2 as published
17  *  by the Free Software Foundation.
18  *
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
39 #include <asm/io.h>
40 #include <asm/irq.h>
41 #include <asm/system.h>
42 #include <asm/unaligned.h>
43 #include <asm/byteorder.h>
44
45 #include "../core/hcd.h"
46 #include "../core/hub.h"
47
48 #define DRIVER_VERSION  "0.16.2"
49 #define DRIVER_AUTHOR   "Gabor Juhos <juhosg at openwrt.org>"
50 #define DRIVER_DESC     "ADMtek USB 1.1 Host Controller Driver"
51
52 /*-------------------------------------------------------------------------*/
53
54 #undef ADMHC_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
59 #define ADMHC_INTR_INIT \
60                 ( ADMHC_INTR_MIE | ADMHC_INTR_INSM | ADMHC_INTR_FATI \
61                 | ADMHC_INTR_RESI | ADMHC_INTR_TDC | ADMHC_INTR_BABI )
62
63 /*-------------------------------------------------------------------------*/
64
65 static const char hcd_name [] = "admhc-hcd";
66
67 #define STATECHANGE_DELAY       msecs_to_jiffies(300)
68
69 #include "adm5120.h"
70
71 static void admhc_dump(struct admhcd *ahcd, int verbose);
72 static int admhc_init(struct admhcd *ahcd);
73 static void admhc_stop(struct usb_hcd *hcd);
74
75 #include "adm5120-dbg.c"
76 #include "adm5120-mem.c"
77 #include "adm5120-pm.c"
78 #include "adm5120-hub.c"
79 #include "adm5120-q.c"
80
81 /*-------------------------------------------------------------------------*/
82
83 /*
84  * queue up an urb for anything except the root hub
85  */
86 static int admhc_urb_enqueue(struct usb_hcd *hcd, struct usb_host_endpoint *ep,
87         struct urb *urb, gfp_t mem_flags)
88 {
89         struct admhcd   *ahcd = hcd_to_admhcd(hcd);
90         struct ed       *ed;
91         struct urb_priv *urb_priv;
92         unsigned int    pipe = urb->pipe;
93         int             td_cnt = 0;
94         unsigned long   flags;
95         int             ret = 0;
96
97 #ifdef ADMHC_VERBOSE_DEBUG
98         spin_lock_irqsave(&ahcd->lock, flags);
99         urb_print(ahcd, urb, "ENQEUE", usb_pipein(pipe));
100         spin_unlock_irqrestore(&ahcd->lock, flags);
101 #endif
102
103         /* every endpoint has an ed, locate and maybe (re)initialize it */
104         ed = ed_get(ahcd, ep, urb->dev, pipe, urb->interval);
105         if (!ed)
106                 return -ENOMEM;
107
108         /* for the private part of the URB we need the number of TDs */
109         switch (ed->type) {
110         case PIPE_CONTROL:
111                 if (urb->transfer_buffer_length > TD_DATALEN_MAX)
112                         /* td_submit_urb() doesn't yet handle these */
113                         return -EMSGSIZE;
114
115                 /* 1 TD for setup, 1 for ACK, plus ... */
116                 td_cnt = 2;
117                 /* FALLTHROUGH */
118         case PIPE_BULK:
119                 /* one TD for every 4096 Bytes (can be upto 8K) */
120                 td_cnt += urb->transfer_buffer_length / TD_DATALEN_MAX;
121                 /* ... and for any remaining bytes ... */
122                 if ((urb->transfer_buffer_length % TD_DATALEN_MAX) != 0)
123                         td_cnt++;
124                 /* ... and maybe a zero length packet to wrap it up */
125                 if (td_cnt == 0)
126                         td_cnt++;
127                 else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
128                         && (urb->transfer_buffer_length
129                                 % usb_maxpacket(urb->dev, pipe,
130                                         usb_pipeout (pipe))) == 0)
131                         td_cnt++;
132                 break;
133         case PIPE_INTERRUPT:
134                 /*
135                  * for Interrupt IN/OUT transactions, each ED contains
136                  * only 1 TD.
137                  * TODO: check transfer_buffer_length?
138                  */
139                 td_cnt = 1;
140                 break;
141         case PIPE_ISOCHRONOUS:
142                 /* number of packets from URB */
143                 td_cnt = urb->number_of_packets;
144                 break;
145         }
146
147         urb_priv = urb_priv_alloc(ahcd, td_cnt, mem_flags);
148         if (!urb_priv)
149                 return -ENOMEM;
150
151         urb_priv->ed = ed;
152
153         spin_lock_irqsave(&ahcd->lock, flags);
154         /* don't submit to a dead HC */
155         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
156                 ret = -ENODEV;
157                 goto fail;
158         }
159         if (!HC_IS_RUNNING(hcd->state)) {
160                 ret = -ENODEV;
161                 goto fail;
162         }
163
164         /* in case of unlink-during-submit */
165         spin_lock(&urb->lock);
166         if (urb->status != -EINPROGRESS) {
167                 spin_unlock(&urb->lock);
168                 urb->hcpriv = urb_priv;
169                 finish_urb(ahcd, urb);
170                 ret = 0;
171                 goto fail;
172         }
173
174         /* schedule the ed if needed */
175         if (ed->state == ED_IDLE) {
176                 ret = ed_schedule(ahcd, ed);
177                 if (ret < 0)
178                         goto fail0;
179
180                 if (ed->type == PIPE_ISOCHRONOUS) {
181                         u16     frame = admhc_frame_no(ahcd);
182
183                         /* delay a few frames before the first TD */
184                         frame += max_t (u16, 8, ed->interval);
185                         frame &= ~(ed->interval - 1);
186                         frame |= ed->branch;
187                         urb->start_frame = frame;
188
189                         /* yes, only URB_ISO_ASAP is supported, and
190                          * urb->start_frame is never used as input.
191                          */
192                 }
193         } else if (ed->type == PIPE_ISOCHRONOUS)
194                 urb->start_frame = ed->last_iso + ed->interval;
195
196         /* fill the TDs and link them to the ed; and
197          * enable that part of the schedule, if needed
198          * and update count of queued periodic urbs
199          */
200         urb->hcpriv = urb_priv;
201         td_submit_urb(ahcd, urb);
202
203 #ifdef ADMHC_VERBOSE_DEBUG
204         admhc_dump_ed(ahcd, "admhc_urb_enqueue", urb_priv->ed, 1);
205 #endif
206
207 fail0:
208         spin_unlock(&urb->lock);
209 fail:
210         if (ret)
211                 urb_priv_free(ahcd, urb_priv);
212
213         spin_unlock_irqrestore(&ahcd->lock, flags);
214         return ret;
215 }
216
217 /*
218  * decouple the URB from the HC queues (TDs, urb_priv); it's
219  * already marked using urb->status.  reporting is always done
220  * asynchronously, and we might be dealing with an urb that's
221  * partially transferred, or an ED with other urbs being unlinked.
222  */
223 static int admhc_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
224 {
225         struct admhcd *ahcd = hcd_to_admhcd(hcd);
226         unsigned long flags;
227
228         spin_lock_irqsave(&ahcd->lock, flags);
229
230 #ifdef ADMHC_VERBOSE_DEBUG
231         urb_print(ahcd, urb, "DEQUEUE", 1);
232 #endif
233
234         if (HC_IS_RUNNING(hcd->state)) {
235                 struct urb_priv *urb_priv;
236
237                 /* Unless an IRQ completed the unlink while it was being
238                  * handed to us, flag it for unlink and giveback, and force
239                  * some upcoming INTR_SF to call finish_unlinks()
240                  */
241                 urb_priv = urb->hcpriv;
242                 if (urb_priv) {
243                         if (urb_priv->ed->state == ED_OPER)
244                                 start_ed_unlink(ahcd, urb_priv->ed);
245                 }
246         } else {
247                 /*
248                  * with HC dead, we won't respect hc queue pointers
249                  * any more ... just clean up every urb's memory.
250                  */
251                 if (urb->hcpriv)
252                         finish_urb(ahcd, urb);
253         }
254         spin_unlock_irqrestore(&ahcd->lock, flags);
255
256         return 0;
257 }
258
259 /*-------------------------------------------------------------------------*/
260
261 /* frees config/altsetting state for endpoints,
262  * including ED memory, dummy TD, and bulk/intr data toggle
263  */
264
265 static void admhc_endpoint_disable(struct usb_hcd *hcd,
266                 struct usb_host_endpoint *ep)
267 {
268         struct admhcd           *ahcd = hcd_to_admhcd(hcd);
269         unsigned long           flags;
270         struct ed               *ed = ep->hcpriv;
271         unsigned                limit = 1000;
272
273         /* ASSERT:  any requests/urbs are being unlinked */
274         /* ASSERT:  nobody can be submitting urbs for this any more */
275
276         if (!ed)
277                 return;
278
279 #ifdef ADMHC_VERBOSE_DEBUG
280         spin_lock_irqsave(&ahcd->lock, flags);
281         admhc_dump_ed(ahcd, "EP-DISABLE", ed, 1);
282         spin_unlock_irqrestore(&ahcd->lock, flags);
283 #endif
284
285 rescan:
286         spin_lock_irqsave(&ahcd->lock, flags);
287
288         if (!HC_IS_RUNNING(hcd->state)) {
289 sanitize:
290                 ed->state = ED_IDLE;
291                 finish_unlinks(ahcd, 0);
292         }
293
294         switch (ed->state) {
295         case ED_UNLINK:         /* wait for hw to finish? */
296                 /* major IRQ delivery trouble loses INTR_SOFI too... */
297                 if (limit-- == 0) {
298                         admhc_warn(ahcd, "IRQ INTR_SOFI lossage\n");
299                         goto sanitize;
300                 }
301                 spin_unlock_irqrestore(&ahcd->lock, flags);
302                 schedule_timeout_uninterruptible(1);
303                 goto rescan;
304         case ED_IDLE:           /* fully unlinked */
305                 if (list_empty(&ed->td_list)) {
306                         td_free (ahcd, ed->dummy);
307                         ed_free (ahcd, ed);
308                         break;
309                 }
310                 /* else FALL THROUGH */
311         default:
312                 /* caller was supposed to have unlinked any requests;
313                  * that's not our job.  can't recover; must leak ed.
314                  */
315                 admhc_err(ahcd, "leak ed %p (#%02x) state %d%s\n",
316                         ed, ep->desc.bEndpointAddress, ed->state,
317                         list_empty(&ed->td_list) ? "" : " (has tds)");
318                 td_free(ahcd, ed->dummy);
319                 break;
320         }
321
322         ep->hcpriv = NULL;
323
324         spin_unlock_irqrestore(&ahcd->lock, flags);
325         return;
326 }
327
328 static int admhc_get_frame_number(struct usb_hcd *hcd)
329 {
330         struct admhcd *ahcd = hcd_to_admhcd(hcd);
331
332         return admhc_frame_no(ahcd);
333 }
334
335 static void admhc_usb_reset(struct admhcd *ahcd)
336 {
337 #if 0
338         ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
339         ahcd->hc_control &= OHCI_CTRL_RWC;
340         admhc_writel(ahcd, ahcd->hc_control, &ahcd->regs->control);
341 #else
342         /* FIXME */
343         ahcd->host_control = ADMHC_BUSS_RESET;
344         admhc_writel(ahcd, ahcd->host_control ,&ahcd->regs->host_control);
345 #endif
346 }
347
348 /* admhc_shutdown forcibly disables IRQs and DMA, helping kexec and
349  * other cases where the next software may expect clean state from the
350  * "firmware".  this is bus-neutral, unlike shutdown() methods.
351  */
352 static void
353 admhc_shutdown(struct usb_hcd *hcd)
354 {
355         struct admhcd *ahcd;
356
357         ahcd = hcd_to_admhcd(hcd);
358         admhc_intr_disable(ahcd, ADMHC_INTR_MIE);
359         admhc_dma_disable(ahcd);
360         admhc_usb_reset(ahcd);
361         /* flush the writes */
362         admhc_writel_flush(ahcd);
363 }
364
365 /*-------------------------------------------------------------------------*
366  * HC functions
367  *-------------------------------------------------------------------------*/
368
369 static void admhc_eds_cleanup(struct admhcd *ahcd)
370 {
371         if (ahcd->ed_tails[PIPE_INTERRUPT]) {
372                 ed_free(ahcd, ahcd->ed_tails[PIPE_INTERRUPT]);
373                 ahcd->ed_tails[PIPE_INTERRUPT] = NULL;
374         }
375
376         if (ahcd->ed_tails[PIPE_ISOCHRONOUS]) {
377                 ed_free(ahcd, ahcd->ed_tails[PIPE_ISOCHRONOUS]);
378                 ahcd->ed_tails[PIPE_ISOCHRONOUS] = NULL;
379         }
380
381         if (ahcd->ed_tails[PIPE_CONTROL]) {
382                 ed_free(ahcd, ahcd->ed_tails[PIPE_CONTROL]);
383                 ahcd->ed_tails[PIPE_CONTROL] = NULL;
384         }
385
386         if (ahcd->ed_tails[PIPE_BULK]) {
387                 ed_free(ahcd, ahcd->ed_tails[PIPE_BULK]);
388                 ahcd->ed_tails[PIPE_BULK] = NULL;
389         }
390
391         ahcd->ed_head = NULL;
392 }
393
394 #define ED_DUMMY_INFO   (ED_SPEED_FULL | ED_SKIP)
395
396 static int admhc_eds_init(struct admhcd *ahcd)
397 {
398         struct ed *ed;
399
400         ed = ed_create(ahcd, PIPE_INTERRUPT, ED_DUMMY_INFO);
401         if (!ed)
402                 goto err;
403
404         ahcd->ed_tails[PIPE_INTERRUPT] = ed;
405
406         ed = ed_create(ahcd, PIPE_ISOCHRONOUS, ED_DUMMY_INFO);
407         if (!ed)
408                 goto err;
409
410         ahcd->ed_tails[PIPE_ISOCHRONOUS] = ed;
411         ed->ed_prev = ahcd->ed_tails[PIPE_INTERRUPT];
412         ahcd->ed_tails[PIPE_INTERRUPT]->ed_next = ed;
413         ahcd->ed_tails[PIPE_INTERRUPT]->hwNextED = cpu_to_hc32(ahcd, ed->dma);
414
415         ed = ed_create(ahcd, PIPE_CONTROL, ED_DUMMY_INFO);
416         if (!ed)
417                 goto err;
418
419         ahcd->ed_tails[PIPE_CONTROL] = ed;
420         ed->ed_prev = ahcd->ed_tails[PIPE_ISOCHRONOUS];
421         ahcd->ed_tails[PIPE_ISOCHRONOUS]->ed_next = ed;
422         ahcd->ed_tails[PIPE_ISOCHRONOUS]->hwNextED = cpu_to_hc32(ahcd, ed->dma);
423
424         ed = ed_create(ahcd, PIPE_BULK, ED_DUMMY_INFO);
425         if (!ed)
426                 goto err;
427
428         ahcd->ed_tails[PIPE_BULK] = ed;
429         ed->ed_prev = ahcd->ed_tails[PIPE_CONTROL];
430         ahcd->ed_tails[PIPE_CONTROL]->ed_next = ed;
431         ahcd->ed_tails[PIPE_CONTROL]->hwNextED = cpu_to_hc32(ahcd, ed->dma);
432
433         ahcd->ed_head = ahcd->ed_tails[PIPE_INTERRUPT];
434
435 #ifdef ADMHC_VERBOSE_DEBUG
436         admhc_dump_ed(ahcd, "ed intr", ahcd->ed_tails[PIPE_INTERRUPT], 1);
437         admhc_dump_ed(ahcd, "ed isoc", ahcd->ed_tails[PIPE_ISOCHRONOUS], 1);
438         admhc_dump_ed(ahcd, "ed ctrl", ahcd->ed_tails[PIPE_CONTROL], 1);
439         admhc_dump_ed(ahcd, "ed bulk", ahcd->ed_tails[PIPE_BULK], 1);
440 #endif
441
442         return 0;
443
444 err:
445         admhc_eds_cleanup(ahcd);
446         return -ENOMEM;
447 }
448
449 /* init memory, and kick BIOS/SMM off */
450
451 static int admhc_init(struct admhcd *ahcd)
452 {
453         struct usb_hcd *hcd = admhcd_to_hcd(ahcd);
454         int ret;
455
456         admhc_disable(ahcd);
457         ahcd->regs = hcd->regs;
458
459         /* Disable HC interrupts */
460         admhc_intr_disable(ahcd, ADMHC_INTR_MIE);
461
462         /* Read the number of ports unless overridden */
463         if (ahcd->num_ports == 0)
464                 ahcd->num_ports = admhc_read_rhdesc(ahcd) & ADMHC_RH_NUMP;
465
466         ret = admhc_mem_init(ahcd);
467         if (ret)
468                 goto err;
469
470         /* init dummy endpoints */
471         ret = admhc_eds_init(ahcd);
472         if (ret)
473                 goto err;
474
475         create_debug_files(ahcd);
476
477         return 0;
478
479 err:
480         admhc_stop(hcd);
481         return ret;
482 }
483
484 /*-------------------------------------------------------------------------*/
485
486 /* Start an OHCI controller, set the BUS operational
487  * resets USB and controller
488  * enable interrupts
489  */
490 static int admhc_run(struct admhcd *ahcd)
491 {
492         u32                     temp;
493         int                     first = ahcd->fminterval == 0;
494         struct usb_hcd          *hcd = admhcd_to_hcd(ahcd);
495
496         admhc_disable(ahcd);
497
498         /* boot firmware should have set this up (5.1.1.3.1) */
499         if (first) {
500                 temp = admhc_readl(ahcd, &ahcd->regs->fminterval);
501                 ahcd->fminterval = temp & ADMHC_SFI_FI_MASK;
502                 if (ahcd->fminterval != FI)
503                         admhc_dbg(ahcd, "fminterval delta %d\n",
504                                 ahcd->fminterval - FI);
505                 ahcd->fminterval |=
506                         (FSLDP(ahcd->fminterval) << ADMHC_SFI_FSLDP_SHIFT);
507                 /* also: power/overcurrent flags in rhdesc */
508         }
509
510 #if 0   /* TODO: not applicable */
511         /* Reset USB nearly "by the book".  RemoteWakeupConnected was
512          * saved if boot firmware (BIOS/SMM/...) told us it's connected,
513          * or if bus glue did the same (e.g. for PCI add-in cards with
514          * PCI PM support).
515          */
516         if ((ahcd->hc_control & OHCI_CTRL_RWC) != 0
517                         && !device_may_wakeup(hcd->self.controller))
518                 device_init_wakeup(hcd->self.controller, 1);
519 #endif
520
521         switch (ahcd->host_control & ADMHC_HC_BUSS) {
522         case ADMHC_BUSS_OPER:
523                 temp = 0;
524                 break;
525         case ADMHC_BUSS_SUSPEND:
526                 /* FALLTHROUGH ? */
527         case ADMHC_BUSS_RESUME:
528                 ahcd->host_control = ADMHC_BUSS_RESUME;
529                 temp = 10 /* msec wait */;
530                 break;
531         /* case ADMHC_BUSS_RESET: */
532         default:
533                 ahcd->host_control = ADMHC_BUSS_RESET;
534                 temp = 50 /* msec wait */;
535                 break;
536         }
537         admhc_writel(ahcd, ahcd->host_control, &ahcd->regs->host_control);
538
539         /* flush the writes */
540         admhc_writel_flush(ahcd);
541
542         msleep(temp);
543         temp = admhc_read_rhdesc(ahcd);
544         if (!(temp & ADMHC_RH_NPS)) {
545                 /* power down each port */
546                 for (temp = 0; temp < ahcd->num_ports; temp++)
547                         admhc_write_portstatus(ahcd, temp, ADMHC_PS_CPP);
548         }
549         /* flush those writes */
550         admhc_writel_flush(ahcd);
551
552         /* 2msec timelimit here means no irqs/preempt */
553         spin_lock_irq(&ahcd->lock);
554
555         admhc_writel(ahcd, ADMHC_CTRL_SR,  &ahcd->regs->gencontrol);
556         temp = 30;      /* ... allow extra time */
557         while ((admhc_readl(ahcd, &ahcd->regs->gencontrol) & ADMHC_CTRL_SR) != 0) {
558                 if (--temp == 0) {
559                         spin_unlock_irq(&ahcd->lock);
560                         admhc_err(ahcd, "USB HC reset timed out!\n");
561                         return -1;
562                 }
563                 udelay(1);
564         }
565
566         /* enable HOST mode, before access any host specific register */
567         admhc_writel(ahcd, ADMHC_CTRL_UHFE,  &ahcd->regs->gencontrol);
568
569         /* Tell the controller where the descriptor list is */
570         admhc_writel(ahcd, (u32)ahcd->ed_head->dma, &ahcd->regs->hosthead);
571
572         periodic_reinit(ahcd);
573
574         /* use rhsc irqs after khubd is fully initialized */
575         hcd->poll_rh = 1;
576         hcd->uses_new_polling = 1;
577
578 #if 0
579         /* wake on ConnectStatusChange, matching external hubs */
580         admhc_writel(ahcd, RH_HS_DRWE, &ahcd->regs->roothub.status);
581 #else
582         /* FIXME roothub_write_status (ahcd, ADMHC_RH_DRWE); */
583 #endif
584
585         /* Choose the interrupts we care about now, others later on demand */
586         admhc_intr_ack(ahcd, ~0);
587         admhc_intr_enable(ahcd, ADMHC_INTR_INIT);
588
589         admhc_writel(ahcd, ADMHC_RH_NPS | ADMHC_RH_LPSC, &ahcd->regs->rhdesc);
590
591         /* flush those writes */
592         admhc_writel_flush(ahcd);
593
594         /* start controller operations */
595         ahcd->host_control = ADMHC_BUSS_OPER;
596         admhc_writel(ahcd, ahcd->host_control, &ahcd->regs->host_control);
597
598         temp = 20;
599         while ((admhc_readl(ahcd, &ahcd->regs->host_control)
600                         & ADMHC_HC_BUSS) != ADMHC_BUSS_OPER) {
601                 if (--temp == 0) {
602                         spin_unlock_irq(&ahcd->lock);
603                         admhc_err(ahcd, "unable to setup operational mode!\n");
604                         return -1;
605                 }
606                 mdelay(1);
607         }
608
609         hcd->state = HC_STATE_RUNNING;
610
611         ahcd->next_statechange = jiffies + STATECHANGE_DELAY;
612
613 #if 0
614         /* FIXME: enabling DMA is always failed here for an unknown reason */
615         admhc_dma_enable(ahcd);
616
617         temp = 200;
618         while ((admhc_readl(ahcd, &ahcd->regs->host_control)
619                         & ADMHC_HC_DMAE) != ADMHC_HC_DMAE) {
620                 if (--temp == 0) {
621                         spin_unlock_irq(&ahcd->lock);
622                         admhc_err(ahcd, "unable to enable DMA!\n");
623                         admhc_dump(ahcd, 1);
624                         return -1;
625                 }
626                 mdelay(1);
627         }
628
629 #endif
630
631         spin_unlock_irq(&ahcd->lock);
632
633         mdelay(ADMHC_POTPGT);
634
635         return 0;
636 }
637
638 /*-------------------------------------------------------------------------*/
639
640 /* an interrupt happens */
641
642 static irqreturn_t admhc_irq(struct usb_hcd *hcd)
643 {
644         struct admhcd *ahcd = hcd_to_admhcd(hcd);
645         struct admhcd_regs __iomem *regs = ahcd->regs;
646         u32 ints;
647
648         ints = admhc_readl(ahcd, &regs->int_status);
649         if ((ints & ADMHC_INTR_INTA) == 0) {
650                 /* no unmasked interrupt status is set */
651                 return IRQ_NONE;
652         }
653
654         ints &= admhc_readl(ahcd, &regs->int_enable);
655
656         if (ints & ADMHC_INTR_FATI) {
657                 /* e.g. due to PCI Master/Target Abort */
658                 admhc_disable(ahcd);
659                 admhc_err(ahcd, "Fatal Error, controller disabled\n");
660                 admhc_dump(ahcd, 1);
661                 admhc_usb_reset(ahcd);
662         }
663
664         if (ints & ADMHC_INTR_BABI) {
665                 admhc_intr_disable(ahcd, ADMHC_INTR_BABI);
666                 admhc_intr_ack(ahcd, ADMHC_INTR_BABI);
667                 admhc_err(ahcd, "Babble Detected\n");
668         }
669
670         if (ints & ADMHC_INTR_INSM) {
671                 admhc_vdbg(ahcd, "Root Hub Status Change\n");
672                 ahcd->next_statechange = jiffies + STATECHANGE_DELAY;
673                 admhc_intr_ack(ahcd, ADMHC_INTR_RESI | ADMHC_INTR_INSM);
674
675                 /* NOTE: Vendors didn't always make the same implementation
676                  * choices for RHSC.  Many followed the spec; RHSC triggers
677                  * on an edge, like setting and maybe clearing a port status
678                  * change bit.  With others it's level-triggered, active
679                  * until khubd clears all the port status change bits.  We'll
680                  * always disable it here and rely on polling until khubd
681                  * re-enables it.
682                  */
683                 admhc_intr_disable(ahcd, ADMHC_INTR_INSM);
684                 usb_hcd_poll_rh_status(hcd);
685         } else if (ints & ADMHC_INTR_RESI) {
686                 /* For connect and disconnect events, we expect the controller
687                  * to turn on RHSC along with RD.  But for remote wakeup events
688                  * this might not happen.
689                  */
690                 admhc_vdbg(ahcd, "Resume Detect\n");
691                 admhc_intr_ack(ahcd, ADMHC_INTR_RESI);
692                 hcd->poll_rh = 1;
693                 if (ahcd->autostop) {
694                         spin_lock(&ahcd->lock);
695                         admhc_rh_resume(ahcd);
696                         spin_unlock(&ahcd->lock);
697                 } else
698                         usb_hcd_resume_root_hub(hcd);
699         }
700
701         if (ints & ADMHC_INTR_TDC) {
702                 admhc_vdbg(ahcd, "Transfer Descriptor Complete\n");
703                 admhc_intr_ack(ahcd, ADMHC_INTR_TDC);
704                 if (HC_IS_RUNNING(hcd->state))
705                         admhc_intr_disable(ahcd, ADMHC_INTR_TDC);
706                 spin_lock(&ahcd->lock);
707                 admhc_td_complete(ahcd);
708                 spin_unlock(&ahcd->lock);
709                 if (HC_IS_RUNNING(hcd->state))
710                         admhc_intr_enable(ahcd, ADMHC_INTR_TDC);
711         }
712
713         if (ints & ADMHC_INTR_SO) {
714                 /* could track INTR_SO to reduce available PCI/... bandwidth */
715                 admhc_vdbg(ahcd, "Schedule Overrun\n");
716         }
717
718 #if 1
719         spin_lock(&ahcd->lock);
720         if (ahcd->ed_rm_list)
721                 finish_unlinks(ahcd, admhc_frame_no(ahcd));
722
723         if ((ints & ADMHC_INTR_SOFI) != 0 && !ahcd->ed_rm_list
724                         && HC_IS_RUNNING(hcd->state))
725                 admhc_intr_disable(ahcd, ADMHC_INTR_SOFI);
726         spin_unlock(&ahcd->lock);
727 #else
728         if (ints & ADMHC_INTR_SOFI) {
729                 admhc_vdbg(ahcd, "Start Of Frame\n");
730                 spin_lock(&ahcd->lock);
731
732                 /* handle any pending ED removes */
733                 finish_unlinks(ahcd, admhc_frameno(ahcd));
734
735                 /* leaving INTR_SOFI enabled when there's still unlinking
736                  * to be done in the (next frame).
737                  */
738                 if ((ahcd->ed_rm_list == NULL) ||
739                         HC_IS_RUNNING(hcd->state) == 0)
740                         /*
741                          * disable INTR_SOFI if there are no unlinking to be
742                          * done (in the next frame)
743                          */
744                         admhc_intr_disable(ahcd, ADMHC_INTR_SOFI);
745
746                 spin_unlock(&ahcd->lock);
747         }
748 #endif
749
750         if (HC_IS_RUNNING(hcd->state)) {
751                 admhc_intr_ack(ahcd, ints);
752                 admhc_intr_enable(ahcd, ADMHC_INTR_MIE);
753                 admhc_writel_flush(ahcd);
754         }
755
756         return IRQ_HANDLED;
757 }
758
759 /*-------------------------------------------------------------------------*/
760
761 static void admhc_stop(struct usb_hcd *hcd)
762 {
763         struct admhcd *ahcd = hcd_to_admhcd(hcd);
764
765         admhc_dump(ahcd, 1);
766
767         flush_scheduled_work();
768
769         admhc_usb_reset(ahcd);
770         admhc_intr_disable(ahcd, ADMHC_INTR_MIE);
771
772         free_irq(hcd->irq, hcd);
773         hcd->irq = -1;
774
775         remove_debug_files(ahcd);
776         admhc_eds_cleanup(ahcd);
777         admhc_mem_cleanup(ahcd);
778 }
779
780 /*-------------------------------------------------------------------------*/
781
782 #ifdef CONFIG_MIPS_ADM5120
783 #include "adm5120-drv.c"
784 #define PLATFORM_DRIVER         usb_hcd_adm5120_driver
785 #endif
786
787 #if     !defined(PLATFORM_DRIVER)
788 #error "missing bus glue for admhc-hcd"
789 #endif
790
791 #define DRIVER_INFO DRIVER_DESC " version " DRIVER_VERSION
792
793 static int __init admhc_hcd_mod_init(void)
794 {
795         int ret = 0;
796
797         if (usb_disabled())
798                 return -ENODEV;
799
800         pr_info("%s: " DRIVER_INFO "\n", hcd_name);
801         pr_info("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
802                 sizeof (struct ed), sizeof (struct td));
803
804 #ifdef PLATFORM_DRIVER
805         ret = platform_driver_register(&PLATFORM_DRIVER);
806         if (ret < 0)
807                 goto error_platform;
808 #endif
809
810         return ret;
811
812 #ifdef PLATFORM_DRIVER
813         platform_driver_unregister(&PLATFORM_DRIVER);
814 error_platform:
815 #endif
816         return ret;
817 }
818 module_init(admhc_hcd_mod_init);
819
820 static void __exit admhc_hcd_mod_exit(void)
821 {
822         platform_driver_unregister(&PLATFORM_DRIVER);
823 }
824 module_exit(admhc_hcd_mod_exit);
825
826 MODULE_AUTHOR(DRIVER_AUTHOR);
827 MODULE_DESCRIPTION(DRIVER_INFO);
828 MODULE_VERSION(DRIVER_VERSION);
829 MODULE_LICENSE("GPL v2");