]> git.enpas.org Git - openwrt.git/blob - target/linux/adm5120/files/drivers/usb/host/adm5120-hcd.c
[adm5120] fix USB driver to compile with ADMH_VERBOSE_DEBUG defined
[openwrt.git] / target / linux / adm5120 / files / drivers / usb / host / adm5120-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 ahcd 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
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  "v0.10.1"
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         default:
146                 /* paranoia */
147                 admhc_err(ahcd, "bad EP type %d", ed->type);
148                 return -EINVAL;
149         }
150
151         urb_priv = urb_priv_alloc(ahcd, td_cnt, mem_flags);
152         if (!urb_priv)
153                 return -ENOMEM;
154
155         urb_priv->ed = ed;
156
157         spin_lock_irqsave(&ahcd->lock, flags);
158         /* don't submit to a dead HC */
159         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
160                 ret = -ENODEV;
161                 goto fail;
162         }
163         if (!HC_IS_RUNNING(hcd->state)) {
164                 ret = -ENODEV;
165                 goto fail;
166         }
167
168         /* in case of unlink-during-submit */
169         spin_lock(&urb->lock);
170         if (urb->status != -EINPROGRESS) {
171                 spin_unlock(&urb->lock);
172                 urb->hcpriv = urb_priv;
173                 finish_urb(ahcd, urb);
174                 ret = 0;
175                 goto fail;
176         }
177
178         /* schedule the ed if needed */
179         if (ed->state == ED_IDLE) {
180                 ret = ed_schedule(ahcd, ed);
181                 if (ret < 0)
182                         goto fail0;
183
184                 if (ed->type == PIPE_ISOCHRONOUS) {
185                         u16     frame = admhc_frame_no(ahcd);
186
187                         /* delay a few frames before the first TD */
188                         frame += max_t (u16, 8, ed->interval);
189                         frame &= ~(ed->interval - 1);
190                         frame |= ed->branch;
191                         urb->start_frame = frame;
192
193                         /* yes, only URB_ISO_ASAP is supported, and
194                          * urb->start_frame is never used as input.
195                          */
196                 }
197         } else if (ed->type == PIPE_ISOCHRONOUS)
198                 urb->start_frame = ed->last_iso + ed->interval;
199
200         /* fill the TDs and link them to the ed; and
201          * enable that part of the schedule, if needed
202          * and update count of queued periodic urbs
203          */
204         urb->hcpriv = urb_priv;
205         td_submit_urb(ahcd, urb);
206
207 #ifdef ADMHC_VERBOSE_DEBUG
208         admhc_dump_ed(ahcd, "admhc_urb_enqueue", urb_priv->ed, 1);
209 #endif
210 fail0:
211         spin_unlock(&urb->lock);
212 fail:
213         if (ret)
214                 urb_priv_free(ahcd, urb_priv);
215
216         spin_unlock_irqrestore(&ahcd->lock, flags);
217         return ret;
218 }
219
220 /*
221  * decouple the URB from the HC queues (TDs, urb_priv); it's
222  * already marked using urb->status.  reporting is always done
223  * asynchronously, and we might be dealing with an urb that's
224  * partially transferred, or an ED with other urbs being unlinked.
225  */
226 static int admhc_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
227 {
228         struct admhcd *ahcd = hcd_to_admhcd(hcd);
229         unsigned long flags;
230
231         spin_lock_irqsave(&ahcd->lock, flags);
232
233 #ifdef ADMHC_VERBOSE_DEBUG
234         urb_print(ahcd, urb, "DEQUEUE", 1);
235 #endif
236
237         if (HC_IS_RUNNING(hcd->state)) {
238                 struct urb_priv *urb_priv;
239
240                 /* Unless an IRQ completed the unlink while it was being
241                  * handed to us, flag it for unlink and giveback, and force
242                  * some upcoming INTR_SF to call finish_unlinks()
243                  */
244                 urb_priv = urb->hcpriv;
245                 if (urb_priv) {
246                         if (urb_priv->ed->state == ED_OPER)
247                                 start_ed_unlink(ahcd, urb_priv->ed);
248                 }
249         } else {
250                 /*
251                  * with HC dead, we won't respect hc queue pointers
252                  * any more ... just clean up every urb's memory.
253                  */
254                 if (urb->hcpriv)
255                         finish_urb(ahcd, urb);
256         }
257         spin_unlock_irqrestore(&ahcd->lock, flags);
258
259         return 0;
260 }
261
262 /*-------------------------------------------------------------------------*/
263
264 /* frees config/altsetting state for endpoints,
265  * including ED memory, dummy TD, and bulk/intr data toggle
266  */
267
268 static void admhc_endpoint_disable(struct usb_hcd *hcd,
269                 struct usb_host_endpoint *ep)
270 {
271         struct admhcd           *ahcd = hcd_to_admhcd(hcd);
272         unsigned long           flags;
273         struct ed               *ed = ep->hcpriv;
274         unsigned                limit = 1000;
275
276         /* ASSERT:  any requests/urbs are being unlinked */
277         /* ASSERT:  nobody can be submitting urbs for this any more */
278
279         if (!ed)
280                 return;
281
282 #ifdef ADMHC_VERBOSE_DEBUG
283         spin_lock_irqsave(&ahcd->lock, flags);
284         admhc_dump_ed(ahcd, "EP-DISABLE", ed, 1);
285         spin_unlock_irqrestore(&ahcd->lock, flags);
286 #endif
287
288 rescan:
289         spin_lock_irqsave(&ahcd->lock, flags);
290
291         if (!HC_IS_RUNNING(hcd->state)) {
292 sanitize:
293                 ed->state = ED_IDLE;
294                 finish_unlinks(ahcd, 0);
295         }
296
297         switch (ed->state) {
298         case ED_UNLINK:         /* wait for hw to finish? */
299                 /* major IRQ delivery trouble loses INTR_SOFI too... */
300                 if (limit-- == 0) {
301                         admhc_warn(ahcd, "IRQ INTR_SOFI lossage\n");
302                         goto sanitize;
303                 }
304                 spin_unlock_irqrestore(&ahcd->lock, flags);
305                 schedule_timeout_uninterruptible(1);
306                 goto rescan;
307         case ED_IDLE:           /* fully unlinked */
308                 if (list_empty(&ed->td_list)) {
309                         td_free (ahcd, ed->dummy);
310                         ed_free (ahcd, ed);
311                         break;
312                 }
313                 /* else FALL THROUGH */
314         default:
315                 /* caller was supposed to have unlinked any requests;
316                  * that's not our job.  can't recover; must leak ed.
317                  */
318                 admhc_err(ahcd, "leak ed %p (#%02x) state %d%s\n",
319                         ed, ep->desc.bEndpointAddress, ed->state,
320                         list_empty(&ed->td_list) ? "" : " (has tds)");
321                 td_free(ahcd, ed->dummy);
322                 break;
323         }
324
325         ep->hcpriv = NULL;
326
327         spin_unlock_irqrestore(&ahcd->lock, flags);
328         return;
329 }
330
331 static int admhc_get_frame_number(struct usb_hcd *hcd)
332 {
333         struct admhcd *ahcd = hcd_to_admhcd(hcd);
334
335         return admhc_frame_no(ahcd);
336 }
337
338 static void admhc_usb_reset(struct admhcd *ahcd)
339 {
340 #if 0
341         ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
342         ahcd->hc_control &= OHCI_CTRL_RWC;
343         admhc_writel(ahcd, ahcd->hc_control, &ahcd->regs->control);
344 #else
345         /* FIXME */
346         ahcd->host_control = ADMHC_BUSS_RESET;
347         admhc_writel(ahcd, ahcd->host_control ,&ahcd->regs->host_control);
348 #endif
349 }
350
351 /* admhc_shutdown forcibly disables IRQs and DMA, helping kexec and
352  * other cases where the next software may expect clean state from the
353  * "firmware".  this is bus-neutral, unlike shutdown() methods.
354  */
355 static void
356 admhc_shutdown(struct usb_hcd *hcd)
357 {
358         struct admhcd *ahcd;
359
360         ahcd = hcd_to_admhcd(hcd);
361         admhc_intr_disable(ahcd, ADMHC_INTR_MIE);
362         admhc_dma_disable(ahcd);
363         admhc_usb_reset(ahcd);
364         /* flush the writes */
365         admhc_writel_flush(ahcd);
366 }
367
368 /*-------------------------------------------------------------------------*
369  * HC functions
370  *-------------------------------------------------------------------------*/
371
372 static void admhc_eds_cleanup(struct admhcd *ahcd)
373 {
374         if (ahcd->ed_tails[PIPE_INTERRUPT]) {
375                 ed_free(ahcd, ahcd->ed_tails[PIPE_INTERRUPT]);
376                 ahcd->ed_tails[PIPE_INTERRUPT] = NULL;
377         }
378
379         if (ahcd->ed_tails[PIPE_ISOCHRONOUS]) {
380                 ed_free(ahcd, ahcd->ed_tails[PIPE_ISOCHRONOUS]);
381                 ahcd->ed_tails[PIPE_ISOCHRONOUS] = NULL;
382         }
383
384         if (ahcd->ed_tails[PIPE_CONTROL]) {
385                 ed_free(ahcd, ahcd->ed_tails[PIPE_CONTROL]);
386                 ahcd->ed_tails[PIPE_CONTROL] = NULL;
387         }
388
389         if (ahcd->ed_tails[PIPE_BULK]) {
390                 ed_free(ahcd, ahcd->ed_tails[PIPE_BULK]);
391                 ahcd->ed_tails[PIPE_BULK] = NULL;
392         }
393
394         ahcd->ed_head = NULL;
395 }
396
397 #define ED_DUMMY_INFO   (ED_SPEED_FULL | ED_SKIP)
398
399 static int admhc_eds_init(struct admhcd *ahcd)
400 {
401         struct ed *ed;
402
403         ed = ed_create(ahcd, PIPE_INTERRUPT, ED_DUMMY_INFO);
404         if (!ed)
405                 goto err;
406
407         ahcd->ed_tails[PIPE_INTERRUPT] = ed;
408
409         ed = ed_create(ahcd, PIPE_ISOCHRONOUS, ED_DUMMY_INFO);
410         if (!ed)
411                 goto err;
412
413         ahcd->ed_tails[PIPE_ISOCHRONOUS] = ed;
414         ed->ed_prev = ahcd->ed_tails[PIPE_INTERRUPT];
415         ahcd->ed_tails[PIPE_INTERRUPT]->ed_next = ed;
416         ahcd->ed_tails[PIPE_INTERRUPT]->hwNextED = cpu_to_hc32(ahcd, ed->dma);
417
418         ed = ed_create(ahcd, PIPE_CONTROL, ED_DUMMY_INFO);
419         if (!ed)
420                 goto err;
421
422         ahcd->ed_tails[PIPE_CONTROL] = ed;
423         ed->ed_prev = ahcd->ed_tails[PIPE_ISOCHRONOUS];
424         ahcd->ed_tails[PIPE_ISOCHRONOUS]->ed_next = ed;
425         ahcd->ed_tails[PIPE_ISOCHRONOUS]->hwNextED = cpu_to_hc32(ahcd, ed->dma);
426
427         ed = ed_create(ahcd, PIPE_BULK, ED_DUMMY_INFO);
428         if (!ed)
429                 goto err;
430
431         ahcd->ed_tails[PIPE_BULK] = ed;
432         ed->ed_prev = ahcd->ed_tails[PIPE_CONTROL];
433         ahcd->ed_tails[PIPE_CONTROL]->ed_next = ed;
434         ahcd->ed_tails[PIPE_CONTROL]->hwNextED = cpu_to_hc32(ahcd, ed->dma);
435
436         ahcd->ed_head = ahcd->ed_tails[PIPE_INTERRUPT];
437
438 #ifdef ADMHC_VERBOSE_DEBUG
439         admhc_dump_ed(ahcd, "ed intr", ahcd->ed_tails[PIPE_INTERRUPT], 1);
440         admhc_dump_ed(ahcd, "ed isoc", ahcd->ed_tails[PIPE_ISOCHRONOUS], 1);
441         admhc_dump_ed(ahcd, "ed ctrl", ahcd->ed_tails[PIPE_CONTROL], 1);
442         admhc_dump_ed(ahcd, "ed bulk", ahcd->ed_tails[PIPE_BULK], 1);
443 #endif
444
445         return 0;
446
447 err:
448         admhc_eds_cleanup(ahcd);
449         return -ENOMEM;
450 }
451
452 /* init memory, and kick BIOS/SMM off */
453
454 static int admhc_init(struct admhcd *ahcd)
455 {
456         struct usb_hcd *hcd = admhcd_to_hcd(ahcd);
457         int ret;
458
459         admhc_disable(ahcd);
460         ahcd->regs = hcd->regs;
461
462         /* Disable HC interrupts */
463         admhc_intr_disable(ahcd, ADMHC_INTR_MIE);
464
465         /* Read the number of ports unless overridden */
466         if (ahcd->num_ports == 0)
467                 ahcd->num_ports = admhc_read_rhdesc(ahcd) & ADMHC_RH_NUMP;
468
469         ret = admhc_mem_init(ahcd);
470         if (ret)
471                 goto err;
472
473         /* init dummy endpoints */
474         ret = admhc_eds_init(ahcd);
475         if (ret)
476                 goto err;
477
478         create_debug_files(ahcd);
479
480         return 0;
481
482 err:
483         admhc_stop(hcd);
484         return ret;
485 }
486
487 /*-------------------------------------------------------------------------*/
488
489 /* Start an OHCI controller, set the BUS operational
490  * resets USB and controller
491  * enable interrupts
492  */
493 static int admhc_run(struct admhcd *ahcd)
494 {
495         u32                     temp;
496         int                     first = ahcd->fminterval == 0;
497         struct usb_hcd          *hcd = admhcd_to_hcd(ahcd);
498
499         admhc_disable(ahcd);
500
501         /* boot firmware should have set this up (5.1.1.3.1) */
502         if (first) {
503                 temp = admhc_readl(ahcd, &ahcd->regs->fminterval);
504                 ahcd->fminterval = temp & ADMHC_SFI_FI_MASK;
505                 if (ahcd->fminterval != FI)
506                         admhc_dbg(ahcd, "fminterval delta %d\n",
507                                 ahcd->fminterval - FI);
508                 ahcd->fminterval |=
509                         (FSLDP(ahcd->fminterval) << ADMHC_SFI_FSLDP_SHIFT);
510                 /* also: power/overcurrent flags in rhdesc */
511         }
512
513 #if 0   /* TODO: not applicable */
514         /* Reset USB nearly "by the book".  RemoteWakeupConnected was
515          * saved if boot firmware (BIOS/SMM/...) told us it's connected,
516          * or if bus glue did the same (e.g. for PCI add-in cards with
517          * PCI PM support).
518          */
519         if ((ahcd->hc_control & OHCI_CTRL_RWC) != 0
520                         && !device_may_wakeup(hcd->self.controller))
521                 device_init_wakeup(hcd->self.controller, 1);
522 #endif
523
524         switch (ahcd->host_control & ADMHC_HC_BUSS) {
525         case ADMHC_BUSS_OPER:
526                 temp = 0;
527                 break;
528         case ADMHC_BUSS_SUSPEND:
529                 /* FALLTHROUGH ? */
530         case ADMHC_BUSS_RESUME:
531                 ahcd->host_control = ADMHC_BUSS_RESUME;
532                 temp = 10 /* msec wait */;
533                 break;
534         /* case ADMHC_BUSS_RESET: */
535         default:
536                 ahcd->host_control = ADMHC_BUSS_RESET;
537                 temp = 50 /* msec wait */;
538                 break;
539         }
540         admhc_writel(ahcd, ahcd->host_control, &ahcd->regs->host_control);
541
542         /* flush the writes */
543         admhc_writel_flush(ahcd);
544
545         msleep(temp);
546         temp = admhc_read_rhdesc(ahcd);
547         if (!(temp & ADMHC_RH_NPS)) {
548                 /* power down each port */
549                 for (temp = 0; temp < ahcd->num_ports; temp++)
550                         admhc_write_portstatus(ahcd, temp, ADMHC_PS_CPP);
551         }
552         /* flush those writes */
553         admhc_writel_flush(ahcd);
554
555         /* 2msec timelimit here means no irqs/preempt */
556         spin_lock_irq(&ahcd->lock);
557
558         admhc_writel(ahcd, ADMHC_CTRL_SR,  &ahcd->regs->gencontrol);
559         temp = 30;      /* ... allow extra time */
560         while ((admhc_readl(ahcd, &ahcd->regs->gencontrol) & ADMHC_CTRL_SR) != 0) {
561                 if (--temp == 0) {
562                         spin_unlock_irq(&ahcd->lock);
563                         admhc_err(ahcd, "USB HC reset timed out!\n");
564                         return -1;
565                 }
566                 udelay(1);
567         }
568
569         /* enable HOST mode, before access any host specific register */
570         admhc_writel(ahcd, ADMHC_CTRL_UHFE,  &ahcd->regs->gencontrol);
571
572         /* Tell the controller where the descriptor list is */
573         admhc_writel(ahcd, (u32)ahcd->ed_head->dma, &ahcd->regs->hosthead);
574
575         periodic_reinit(ahcd);
576
577         /* use rhsc irqs after khubd is fully initialized */
578         hcd->poll_rh = 1;
579         hcd->uses_new_polling = 1;
580
581 #if 0
582         /* wake on ConnectStatusChange, matching external hubs */
583         admhc_writel(ahcd, RH_HS_DRWE, &ahcd->regs->roothub.status);
584 #else
585         /* FIXME roothub_write_status (ahcd, ADMHC_RH_DRWE); */
586 #endif
587
588         /* Choose the interrupts we care about now, others later on demand */
589         admhc_intr_ack(ahcd, ~0);
590         admhc_intr_enable(ahcd, ADMHC_INTR_INIT);
591
592         admhc_writel(ahcd, ADMHC_RH_NPS | ADMHC_RH_LPSC, &ahcd->regs->rhdesc);
593
594         /* flush those writes */
595         admhc_writel_flush(ahcd);
596
597         /* start controller operations */
598         ahcd->host_control = ADMHC_BUSS_OPER;
599         admhc_writel(ahcd, ahcd->host_control, &ahcd->regs->host_control);
600
601         temp = 20;
602         while ((admhc_readl(ahcd, &ahcd->regs->host_control)
603                         & ADMHC_HC_BUSS) != ADMHC_BUSS_OPER) {
604                 if (--temp == 0) {
605                         spin_unlock_irq(&ahcd->lock);
606                         admhc_err(ahcd, "unable to setup operational mode!\n");
607                         return -1;
608                 }
609                 mdelay(1);
610         }
611
612         hcd->state = HC_STATE_RUNNING;
613
614         ahcd->next_statechange = jiffies + STATECHANGE_DELAY;
615
616 #if 0
617         /* FIXME: enabling DMA is always failed here for an unknown reason */
618         admhc_dma_enable(ahcd);
619
620         temp = 200;
621         while ((admhc_readl(ahcd, &ahcd->regs->host_control)
622                         & ADMHC_HC_DMAE) != ADMHC_HC_DMAE) {
623                 if (--temp == 0) {
624                         spin_unlock_irq(&ahcd->lock);
625                         admhc_err(ahcd, "unable to enable DMA!\n");
626                         admhc_dump(ahcd, 1);
627                         return -1;
628                 }
629                 mdelay(1);
630         }
631
632 #endif
633
634         spin_unlock_irq(&ahcd->lock);
635
636         mdelay(ADMHC_POTPGT);
637
638         return 0;
639 }
640
641 /*-------------------------------------------------------------------------*/
642
643 /* an interrupt happens */
644
645 static irqreturn_t admhc_irq(struct usb_hcd *hcd)
646 {
647         struct admhcd *ahcd = hcd_to_admhcd(hcd);
648         struct admhcd_regs __iomem *regs = ahcd->regs;
649         u32 ints;
650
651         ints = admhc_readl(ahcd, &regs->int_status);
652         if ((ints & ADMHC_INTR_INTA) == 0) {
653                 /* no unmasked interrupt status is set */
654                 return IRQ_NONE;
655         }
656
657         ints &= admhc_readl(ahcd, &regs->int_enable);
658
659         if (ints & ADMHC_INTR_FATI) {
660                 /* e.g. due to PCI Master/Target Abort */
661                 admhc_disable(ahcd);
662                 admhc_err(ahcd, "Fatal Error, controller disabled\n");
663                 admhc_dump(ahcd, 1);
664                 admhc_usb_reset(ahcd);
665         }
666
667         if (ints & ADMHC_INTR_BABI) {
668                 admhc_intr_disable(ahcd, ADMHC_INTR_BABI);
669                 admhc_intr_ack(ahcd, ADMHC_INTR_BABI);
670                 admhc_err(ahcd, "Babble Detected\n");
671         }
672
673         if (ints & ADMHC_INTR_INSM) {
674                 admhc_vdbg(ahcd, "Root Hub Status Change\n");
675                 ahcd->next_statechange = jiffies + STATECHANGE_DELAY;
676                 admhc_intr_ack(ahcd, ADMHC_INTR_RESI | ADMHC_INTR_INSM);
677
678                 /* NOTE: Vendors didn't always make the same implementation
679                  * choices for RHSC.  Many followed the spec; RHSC triggers
680                  * on an edge, like setting and maybe clearing a port status
681                  * change bit.  With others it's level-triggered, active
682                  * until khubd clears all the port status change bits.  We'll
683                  * always disable it here and rely on polling until khubd
684                  * re-enables it.
685                  */
686                 admhc_intr_disable(ahcd, ADMHC_INTR_INSM);
687                 usb_hcd_poll_rh_status(hcd);
688         } else if (ints & ADMHC_INTR_RESI) {
689                 /* For connect and disconnect events, we expect the controller
690                  * to turn on RHSC along with RD.  But for remote wakeup events
691                  * this might not happen.
692                  */
693                 admhc_vdbg(ahcd, "Resume Detect\n");
694                 admhc_intr_ack(ahcd, ADMHC_INTR_RESI);
695                 hcd->poll_rh = 1;
696                 if (ahcd->autostop) {
697                         spin_lock(&ahcd->lock);
698                         admhc_rh_resume(ahcd);
699                         spin_unlock(&ahcd->lock);
700                 } else
701                         usb_hcd_resume_root_hub(hcd);
702         }
703
704         if (ints & ADMHC_INTR_TDC) {
705                 admhc_vdbg(ahcd, "Transfer Descriptor Complete\n");
706                 admhc_intr_ack(ahcd, ADMHC_INTR_TDC);
707                 if (HC_IS_RUNNING(hcd->state))
708                         admhc_intr_disable(ahcd, ADMHC_INTR_TDC);
709                 spin_lock(&ahcd->lock);
710                 admhc_td_complete(ahcd);
711                 spin_unlock(&ahcd->lock);
712                 if (HC_IS_RUNNING(hcd->state))
713                         admhc_intr_enable(ahcd, ADMHC_INTR_TDC);
714         }
715
716         if (ints & ADMHC_INTR_SO) {
717                 /* could track INTR_SO to reduce available PCI/... bandwidth */
718                 admhc_vdbg(ahcd, "Schedule Overrun\n");
719         }
720
721 #if 1
722         spin_lock(&ahcd->lock);
723         if (ahcd->ed_rm_list)
724                 finish_unlinks(ahcd, admhc_frame_no(ahcd));
725
726         if ((ints & ADMHC_INTR_SOFI) != 0 && !ahcd->ed_rm_list
727                         && HC_IS_RUNNING(hcd->state))
728                 admhc_intr_disable(ahcd, ADMHC_INTR_SOFI);
729         spin_unlock(&ahcd->lock);
730 #else
731         if (ints & ADMHC_INTR_SOFI) {
732                 admhc_vdbg(ahcd, "Start Of Frame\n");
733                 spin_lock(&ahcd->lock);
734
735                 /* handle any pending ED removes */
736                 finish_unlinks(ahcd, admhc_frameno(ahcd));
737
738                 /* leaving INTR_SOFI enabled when there's still unlinking
739                  * to be done in the (next frame).
740                  */
741                 if ((ahcd->ed_rm_list == NULL) ||
742                         HC_IS_RUNNING(hcd->state) == 0)
743                         /*
744                          * disable INTR_SOFI if there are no unlinking to be
745                          * done (in the next frame)
746                          */
747                         admhc_intr_disable(ahcd, ADMHC_INTR_SOFI);
748
749                 spin_unlock(&ahcd->lock);
750         }
751 #endif
752
753         if (HC_IS_RUNNING(hcd->state)) {
754                 admhc_intr_ack(ahcd, ints);
755                 admhc_intr_enable(ahcd, ADMHC_INTR_MIE);
756                 admhc_writel_flush(ahcd);
757         }
758
759         return IRQ_HANDLED;
760 }
761
762 /*-------------------------------------------------------------------------*/
763
764 static void admhc_stop(struct usb_hcd *hcd)
765 {
766         struct admhcd *ahcd = hcd_to_admhcd(hcd);
767
768         admhc_dump(ahcd, 1);
769
770         flush_scheduled_work();
771
772         admhc_usb_reset(ahcd);
773         admhc_intr_disable(ahcd, ADMHC_INTR_MIE);
774
775         free_irq(hcd->irq, hcd);
776         hcd->irq = -1;
777
778         remove_debug_files(ahcd);
779         admhc_eds_cleanup(ahcd);
780         admhc_mem_cleanup(ahcd);
781 }
782
783 /*-------------------------------------------------------------------------*/
784
785 #ifdef CONFIG_MIPS_ADM5120
786 #include "adm5120-drv.c"
787 #define PLATFORM_DRIVER         usb_hcd_adm5120_driver
788 #endif
789
790 #if     !defined(PLATFORM_DRIVER)
791 #error "missing bus glue for admhc-hcd"
792 #endif
793
794 #define DRIVER_INFO DRIVER_DESC " " DRIVER_VERSION
795
796 static int __init admhc_hcd_mod_init(void)
797 {
798         int ret = 0;
799
800         if (usb_disabled())
801                 return -ENODEV;
802
803         pr_info("%s: " DRIVER_INFO "\n", hcd_name);
804         pr_info("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
805                 sizeof (struct ed), sizeof (struct td));
806
807 #ifdef PLATFORM_DRIVER
808         ret = platform_driver_register(&PLATFORM_DRIVER);
809         if (ret < 0)
810                 goto error_platform;
811 #endif
812
813         return ret;
814
815 #ifdef PLATFORM_DRIVER
816         platform_driver_unregister(&PLATFORM_DRIVER);
817 error_platform:
818 #endif
819         return ret;
820 }
821 module_init(admhc_hcd_mod_init);
822
823 static void __exit admhc_hcd_mod_exit(void)
824 {
825         platform_driver_unregister(&PLATFORM_DRIVER);
826 }
827 module_exit(admhc_hcd_mod_exit);
828
829 MODULE_AUTHOR(DRIVER_AUTHOR);
830 MODULE_DESCRIPTION(DRIVER_INFO);
831 MODULE_LICENSE("GPL");