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Linux/drivers/usb/host/isp116x-hcd.c

  1 /*
  2  * ISP116x HCD (Host Controller Driver) for USB.
  3  *
  4  * Derived from the SL811 HCD, rewritten for ISP116x.
  5  * Copyright (C) 2005 Olav Kongas <ok@artecdesign.ee>
  6  *
  7  * Portions:
  8  * Copyright (C) 2004 Psion Teklogix (for NetBook PRO)
  9  * Copyright (C) 2004 David Brownell
 10  *
 11  * Periodic scheduling is based on Roman's OHCI code
 12  * Copyright (C) 1999 Roman Weissgaerber
 13  *
 14  */
 15 
 16 /*
 17  * The driver basically works. A number of people have used it with a range
 18  * of devices.
 19  *
 20  * The driver passes all usbtests 1-14.
 21  *
 22  * Suspending/resuming of root hub via sysfs works. Remote wakeup works too.
 23  * And suspending/resuming of platform device works too. Suspend/resume
 24  * via HCD operations vector is not implemented.
 25  *
 26  * Iso transfer support is not implemented. Adding this would include
 27  * implementing recovery from the failure to service the processed ITL
 28  * fifo ram in time, which will involve chip reset.
 29  *
 30  * TODO:
 31  + More testing of suspend/resume.
 32 */
 33 
 34 /*
 35   ISP116x chips require certain delays between accesses to its
 36   registers. The following timing options exist.
 37 
 38   1. Configure your memory controller (the best)
 39   2. Implement platform-specific delay function possibly
 40   combined with configuring the memory controller; see
 41   include/linux/usb-isp116x.h for more info. Some broken
 42   memory controllers line LH7A400 SMC need this. Also,
 43   uncomment for that to work the following
 44   USE_PLATFORM_DELAY macro.
 45   3. Use ndelay (easiest, poorest). For that, uncomment
 46   the following USE_NDELAY macro.
 47 */
 48 #define USE_PLATFORM_DELAY
 49 //#define USE_NDELAY
 50 
 51 //#define DEBUG
 52 //#define VERBOSE
 53 /* Transfer descriptors. See dump_ptd() for printout format  */
 54 //#define PTD_TRACE
 55 /* enqueuing/finishing log of urbs */
 56 //#define URB_TRACE
 57 
 58 #include <linux/module.h>
 59 #include <linux/delay.h>
 60 #include <linux/debugfs.h>
 61 #include <linux/seq_file.h>
 62 #include <linux/errno.h>
 63 #include <linux/list.h>
 64 #include <linux/slab.h>
 65 #include <linux/usb.h>
 66 #include <linux/usb/isp116x.h>
 67 #include <linux/usb/hcd.h>
 68 #include <linux/platform_device.h>
 69 
 70 #include <asm/io.h>
 71 #include <asm/irq.h>
 72 #include <asm/byteorder.h>
 73 
 74 #include "isp116x.h"
 75 
 76 #define DRIVER_VERSION  "03 Nov 2005"
 77 #define DRIVER_DESC     "ISP116x USB Host Controller Driver"
 78 
 79 MODULE_DESCRIPTION(DRIVER_DESC);
 80 MODULE_LICENSE("GPL");
 81 
 82 static const char hcd_name[] = "isp116x-hcd";
 83 
 84 /*-----------------------------------------------------------------*/
 85 
 86 /*
 87   Write len bytes to fifo, pad till 32-bit boundary
 88  */
 89 static void write_ptddata_to_fifo(struct isp116x *isp116x, void *buf, int len)
 90 {
 91         u8 *dp = (u8 *) buf;
 92         u16 *dp2 = (u16 *) buf;
 93         u16 w;
 94         int quot = len % 4;
 95 
 96         /* buffer is already in 'usb data order', which is LE. */
 97         /* When reading buffer as u16, we have to take care byte order */
 98         /* doesn't get mixed up */
 99 
100         if ((unsigned long)dp2 & 1) {
101                 /* not aligned */
102                 for (; len > 1; len -= 2) {
103                         w = *dp++;
104                         w |= *dp++ << 8;
105                         isp116x_raw_write_data16(isp116x, w);
106                 }
107                 if (len)
108                         isp116x_write_data16(isp116x, (u16) * dp);
109         } else {
110                 /* aligned */
111                 for (; len > 1; len -= 2) {
112                         /* Keep byte order ! */
113                         isp116x_raw_write_data16(isp116x, cpu_to_le16(*dp2++));
114                 }
115 
116                 if (len)
117                         isp116x_write_data16(isp116x, 0xff & *((u8 *) dp2));
118         }
119         if (quot == 1 || quot == 2)
120                 isp116x_raw_write_data16(isp116x, 0);
121 }
122 
123 /*
124   Read len bytes from fifo and then read till 32-bit boundary.
125  */
126 static void read_ptddata_from_fifo(struct isp116x *isp116x, void *buf, int len)
127 {
128         u8 *dp = (u8 *) buf;
129         u16 *dp2 = (u16 *) buf;
130         u16 w;
131         int quot = len % 4;
132 
133         /* buffer is already in 'usb data order', which is LE. */
134         /* When reading buffer as u16, we have to take care byte order */
135         /* doesn't get mixed up */
136 
137         if ((unsigned long)dp2 & 1) {
138                 /* not aligned */
139                 for (; len > 1; len -= 2) {
140                         w = isp116x_raw_read_data16(isp116x);
141                         *dp++ = w & 0xff;
142                         *dp++ = (w >> 8) & 0xff;
143                 }
144 
145                 if (len)
146                         *dp = 0xff & isp116x_read_data16(isp116x);
147         } else {
148                 /* aligned */
149                 for (; len > 1; len -= 2) {
150                         /* Keep byte order! */
151                         *dp2++ = le16_to_cpu(isp116x_raw_read_data16(isp116x));
152                 }
153 
154                 if (len)
155                         *(u8 *) dp2 = 0xff & isp116x_read_data16(isp116x);
156         }
157         if (quot == 1 || quot == 2)
158                 isp116x_raw_read_data16(isp116x);
159 }
160 
161 /*
162   Write ptd's and data for scheduled transfers into
163   the fifo ram. Fifo must be empty and ready.
164 */
165 static void pack_fifo(struct isp116x *isp116x)
166 {
167         struct isp116x_ep *ep;
168         struct ptd *ptd;
169         int buflen = isp116x->atl_last_dir == PTD_DIR_IN
170             ? isp116x->atl_bufshrt : isp116x->atl_buflen;
171 
172         isp116x_write_reg16(isp116x, HCuPINT, HCuPINT_AIIEOT);
173         isp116x_write_reg16(isp116x, HCXFERCTR, buflen);
174         isp116x_write_addr(isp116x, HCATLPORT | ISP116x_WRITE_OFFSET);
175         for (ep = isp116x->atl_active; ep; ep = ep->active) {
176                 ptd = &ep->ptd;
177                 dump_ptd(ptd);
178                 dump_ptd_out_data(ptd, ep->data);
179                 isp116x_write_data16(isp116x, ptd->count);
180                 isp116x_write_data16(isp116x, ptd->mps);
181                 isp116x_write_data16(isp116x, ptd->len);
182                 isp116x_write_data16(isp116x, ptd->faddr);
183                 buflen -= sizeof(struct ptd);
184                 /* Skip writing data for last IN PTD */
185                 if (ep->active || (isp116x->atl_last_dir != PTD_DIR_IN)) {
186                         write_ptddata_to_fifo(isp116x, ep->data, ep->length);
187                         buflen -= ALIGN(ep->length, 4);
188                 }
189         }
190         BUG_ON(buflen);
191 }
192 
193 /*
194   Read the processed ptd's and data from fifo ram back to
195   URBs' buffers. Fifo must be full and done
196 */
197 static void unpack_fifo(struct isp116x *isp116x)
198 {
199         struct isp116x_ep *ep;
200         struct ptd *ptd;
201         int buflen = isp116x->atl_last_dir == PTD_DIR_IN
202             ? isp116x->atl_buflen : isp116x->atl_bufshrt;
203 
204         isp116x_write_reg16(isp116x, HCuPINT, HCuPINT_AIIEOT);
205         isp116x_write_reg16(isp116x, HCXFERCTR, buflen);
206         isp116x_write_addr(isp116x, HCATLPORT);
207         for (ep = isp116x->atl_active; ep; ep = ep->active) {
208                 ptd = &ep->ptd;
209                 ptd->count = isp116x_read_data16(isp116x);
210                 ptd->mps = isp116x_read_data16(isp116x);
211                 ptd->len = isp116x_read_data16(isp116x);
212                 ptd->faddr = isp116x_read_data16(isp116x);
213                 buflen -= sizeof(struct ptd);
214                 /* Skip reading data for last Setup or Out PTD */
215                 if (ep->active || (isp116x->atl_last_dir == PTD_DIR_IN)) {
216                         read_ptddata_from_fifo(isp116x, ep->data, ep->length);
217                         buflen -= ALIGN(ep->length, 4);
218                 }
219                 dump_ptd(ptd);
220                 dump_ptd_in_data(ptd, ep->data);
221         }
222         BUG_ON(buflen);
223 }
224 
225 /*---------------------------------------------------------------*/
226 
227 /*
228   Set up PTD's.
229 */
230 static void preproc_atl_queue(struct isp116x *isp116x)
231 {
232         struct isp116x_ep *ep;
233         struct urb *urb;
234         struct ptd *ptd;
235         u16 len;
236 
237         for (ep = isp116x->atl_active; ep; ep = ep->active) {
238                 u16 toggle = 0, dir = PTD_DIR_SETUP;
239 
240                 BUG_ON(list_empty(&ep->hep->urb_list));
241                 urb = container_of(ep->hep->urb_list.next,
242                                    struct urb, urb_list);
243                 ptd = &ep->ptd;
244                 len = ep->length;
245                 ep->data = (unsigned char *)urb->transfer_buffer
246                     + urb->actual_length;
247 
248                 switch (ep->nextpid) {
249                 case USB_PID_IN:
250                         toggle = usb_gettoggle(urb->dev, ep->epnum, 0);
251                         dir = PTD_DIR_IN;
252                         break;
253                 case USB_PID_OUT:
254                         toggle = usb_gettoggle(urb->dev, ep->epnum, 1);
255                         dir = PTD_DIR_OUT;
256                         break;
257                 case USB_PID_SETUP:
258                         len = sizeof(struct usb_ctrlrequest);
259                         ep->data = urb->setup_packet;
260                         break;
261                 case USB_PID_ACK:
262                         toggle = 1;
263                         len = 0;
264                         dir = (urb->transfer_buffer_length
265                                && usb_pipein(urb->pipe))
266                             ? PTD_DIR_OUT : PTD_DIR_IN;
267                         break;
268                 default:
269                         ERR("%s %d: ep->nextpid %d\n", __func__, __LINE__,
270                             ep->nextpid);
271                         BUG();
272                 }
273 
274                 ptd->count = PTD_CC_MSK | PTD_ACTIVE_MSK | PTD_TOGGLE(toggle);
275                 ptd->mps = PTD_MPS(ep->maxpacket)
276                     | PTD_SPD(urb->dev->speed == USB_SPEED_LOW)
277                     | PTD_EP(ep->epnum);
278                 ptd->len = PTD_LEN(len) | PTD_DIR(dir);
279                 ptd->faddr = PTD_FA(usb_pipedevice(urb->pipe));
280                 if (!ep->active) {
281                         ptd->mps |= PTD_LAST_MSK;
282                         isp116x->atl_last_dir = dir;
283                 }
284                 isp116x->atl_bufshrt = sizeof(struct ptd) + isp116x->atl_buflen;
285                 isp116x->atl_buflen = isp116x->atl_bufshrt + ALIGN(len, 4);
286         }
287 }
288 
289 /*
290   Take done or failed requests out of schedule. Give back
291   processed urbs.
292 */
293 static void finish_request(struct isp116x *isp116x, struct isp116x_ep *ep,
294                            struct urb *urb, int status)
295 __releases(isp116x->lock) __acquires(isp116x->lock)
296 {
297         unsigned i;
298 
299         ep->error_count = 0;
300 
301         if (usb_pipecontrol(urb->pipe))
302                 ep->nextpid = USB_PID_SETUP;
303 
304         urb_dbg(urb, "Finish");
305 
306         usb_hcd_unlink_urb_from_ep(isp116x_to_hcd(isp116x), urb);
307         spin_unlock(&isp116x->lock);
308         usb_hcd_giveback_urb(isp116x_to_hcd(isp116x), urb, status);
309         spin_lock(&isp116x->lock);
310 
311         /* take idle endpoints out of the schedule */
312         if (!list_empty(&ep->hep->urb_list))
313                 return;
314 
315         /* async deschedule */
316         if (!list_empty(&ep->schedule)) {
317                 list_del_init(&ep->schedule);
318                 return;
319         }
320 
321         /* periodic deschedule */
322         DBG("deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
323         for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
324                 struct isp116x_ep *temp;
325                 struct isp116x_ep **prev = &isp116x->periodic[i];
326 
327                 while (*prev && ((temp = *prev) != ep))
328                         prev = &temp->next;
329                 if (*prev)
330                         *prev = ep->next;
331                 isp116x->load[i] -= ep->load;
332         }
333         ep->branch = PERIODIC_SIZE;
334         isp116x_to_hcd(isp116x)->self.bandwidth_allocated -=
335             ep->load / ep->period;
336 
337         /* switch irq type? */
338         if (!--isp116x->periodic_count) {
339                 isp116x->irqenb &= ~HCuPINT_SOF;
340                 isp116x->irqenb |= HCuPINT_ATL;
341         }
342 }
343 
344 /*
345   Analyze transfer results, handle partial transfers and errors
346 */
347 static void postproc_atl_queue(struct isp116x *isp116x)
348 {
349         struct isp116x_ep *ep;
350         struct urb *urb;
351         struct usb_device *udev;
352         struct ptd *ptd;
353         int short_not_ok;
354         int status;
355         u8 cc;
356 
357         for (ep = isp116x->atl_active; ep; ep = ep->active) {
358                 BUG_ON(list_empty(&ep->hep->urb_list));
359                 urb =
360                     container_of(ep->hep->urb_list.next, struct urb, urb_list);
361                 udev = urb->dev;
362                 ptd = &ep->ptd;
363                 cc = PTD_GET_CC(ptd);
364                 short_not_ok = 1;
365                 status = -EINPROGRESS;
366 
367                 /* Data underrun is special. For allowed underrun
368                    we clear the error and continue as normal. For
369                    forbidden underrun we finish the DATA stage
370                    immediately while for control transfer,
371                    we do a STATUS stage. */
372                 if (cc == TD_DATAUNDERRUN) {
373                         if (!(urb->transfer_flags & URB_SHORT_NOT_OK) ||
374                                         usb_pipecontrol(urb->pipe)) {
375                                 DBG("Allowed or control data underrun\n");
376                                 cc = TD_CC_NOERROR;
377                                 short_not_ok = 0;
378                         } else {
379                                 ep->error_count = 1;
380                                 usb_settoggle(udev, ep->epnum,
381                                               ep->nextpid == USB_PID_OUT,
382                                               PTD_GET_TOGGLE(ptd));
383                                 urb->actual_length += PTD_GET_COUNT(ptd);
384                                 status = cc_to_error[TD_DATAUNDERRUN];
385                                 goto done;
386                         }
387                 }
388 
389                 if (cc != TD_CC_NOERROR && cc != TD_NOTACCESSED
390                     && (++ep->error_count >= 3 || cc == TD_CC_STALL
391                         || cc == TD_DATAOVERRUN)) {
392                         status = cc_to_error[cc];
393                         if (ep->nextpid == USB_PID_ACK)
394                                 ep->nextpid = 0;
395                         goto done;
396                 }
397                 /* According to usb spec, zero-length Int transfer signals
398                    finishing of the urb. Hey, does this apply only
399                    for IN endpoints? */
400                 if (usb_pipeint(urb->pipe) && !PTD_GET_LEN(ptd)) {
401                         status = 0;
402                         goto done;
403                 }
404 
405                 /* Relax after previously failed, but later succeeded
406                    or correctly NAK'ed retransmission attempt */
407                 if (ep->error_count
408                     && (cc == TD_CC_NOERROR || cc == TD_NOTACCESSED))
409                         ep->error_count = 0;
410 
411                 /* Take into account idiosyncracies of the isp116x chip
412                    regarding toggle bit for failed transfers */
413                 if (ep->nextpid == USB_PID_OUT)
414                         usb_settoggle(udev, ep->epnum, 1, PTD_GET_TOGGLE(ptd)
415                                       ^ (ep->error_count > 0));
416                 else if (ep->nextpid == USB_PID_IN)
417                         usb_settoggle(udev, ep->epnum, 0, PTD_GET_TOGGLE(ptd)
418                                       ^ (ep->error_count > 0));
419 
420                 switch (ep->nextpid) {
421                 case USB_PID_IN:
422                 case USB_PID_OUT:
423                         urb->actual_length += PTD_GET_COUNT(ptd);
424                         if (PTD_GET_ACTIVE(ptd)
425                             || (cc != TD_CC_NOERROR && cc < 0x0E))
426                                 break;
427                         if (urb->transfer_buffer_length != urb->actual_length) {
428                                 if (short_not_ok)
429                                         break;
430                         } else {
431                                 if (urb->transfer_flags & URB_ZERO_PACKET
432                                     && ep->nextpid == USB_PID_OUT
433                                     && !(PTD_GET_COUNT(ptd) % ep->maxpacket)) {
434                                         DBG("Zero packet requested\n");
435                                         break;
436                                 }
437                         }
438                         /* All data for this URB is transferred, let's finish */
439                         if (usb_pipecontrol(urb->pipe))
440                                 ep->nextpid = USB_PID_ACK;
441                         else
442                                 status = 0;
443                         break;
444                 case USB_PID_SETUP:
445                         if (PTD_GET_ACTIVE(ptd)
446                             || (cc != TD_CC_NOERROR && cc < 0x0E))
447                                 break;
448                         if (urb->transfer_buffer_length == urb->actual_length)
449                                 ep->nextpid = USB_PID_ACK;
450                         else if (usb_pipeout(urb->pipe)) {
451                                 usb_settoggle(udev, 0, 1, 1);
452                                 ep->nextpid = USB_PID_OUT;
453                         } else {
454                                 usb_settoggle(udev, 0, 0, 1);
455                                 ep->nextpid = USB_PID_IN;
456                         }
457                         break;
458                 case USB_PID_ACK:
459                         if (PTD_GET_ACTIVE(ptd)
460                             || (cc != TD_CC_NOERROR && cc < 0x0E))
461                                 break;
462                         status = 0;
463                         ep->nextpid = 0;
464                         break;
465                 default:
466                         BUG();
467                 }
468 
469  done:
470                 if (status != -EINPROGRESS || urb->unlinked)
471                         finish_request(isp116x, ep, urb, status);
472         }
473 }
474 
475 /*
476   Scan transfer lists, schedule transfers, send data off
477   to chip.
478  */
479 static void start_atl_transfers(struct isp116x *isp116x)
480 {
481         struct isp116x_ep *last_ep = NULL, *ep;
482         struct urb *urb;
483         u16 load = 0;
484         int len, index, speed, byte_time;
485 
486         if (atomic_read(&isp116x->atl_finishing))
487                 return;
488 
489         if (!HC_IS_RUNNING(isp116x_to_hcd(isp116x)->state))
490                 return;
491 
492         /* FIFO not empty? */
493         if (isp116x_read_reg16(isp116x, HCBUFSTAT) & HCBUFSTAT_ATL_FULL)
494                 return;
495 
496         isp116x->atl_active = NULL;
497         isp116x->atl_buflen = isp116x->atl_bufshrt = 0;
498 
499         /* Schedule int transfers */
500         if (isp116x->periodic_count) {
501                 isp116x->fmindex = index =
502                     (isp116x->fmindex + 1) & (PERIODIC_SIZE - 1);
503                 if ((load = isp116x->load[index])) {
504                         /* Bring all int transfers for this frame
505                            into the active queue */
506                         isp116x->atl_active = last_ep =
507                             isp116x->periodic[index];
508                         while (last_ep->next)
509                                 last_ep = (last_ep->active = last_ep->next);
510                         last_ep->active = NULL;
511                 }
512         }
513 
514         /* Schedule control/bulk transfers */
515         list_for_each_entry(ep, &isp116x->async, schedule) {
516                 urb = container_of(ep->hep->urb_list.next,
517                                    struct urb, urb_list);
518                 speed = urb->dev->speed;
519                 byte_time = speed == USB_SPEED_LOW
520                     ? BYTE_TIME_LOWSPEED : BYTE_TIME_FULLSPEED;
521 
522                 if (ep->nextpid == USB_PID_SETUP) {
523                         len = sizeof(struct usb_ctrlrequest);
524                 } else if (ep->nextpid == USB_PID_ACK) {
525                         len = 0;
526                 } else {
527                         /* Find current free length ... */
528                         len = (MAX_LOAD_LIMIT - load) / byte_time;
529 
530                         /* ... then limit it to configured max size ... */
531                         len = min(len, speed == USB_SPEED_LOW ?
532                                   MAX_TRANSFER_SIZE_LOWSPEED :
533                                   MAX_TRANSFER_SIZE_FULLSPEED);
534 
535                         /* ... and finally cut to the multiple of MaxPacketSize,
536                            or to the real length if there's enough room. */
537                         if (len <
538                             (urb->transfer_buffer_length -
539                              urb->actual_length)) {
540                                 len -= len % ep->maxpacket;
541                                 if (!len)
542                                         continue;
543                         } else
544                                 len = urb->transfer_buffer_length -
545                                     urb->actual_length;
546                         BUG_ON(len < 0);
547                 }
548 
549                 load += len * byte_time;
550                 if (load > MAX_LOAD_LIMIT)
551                         break;
552 
553                 ep->active = NULL;
554                 ep->length = len;
555                 if (last_ep)
556                         last_ep->active = ep;
557                 else
558                         isp116x->atl_active = ep;
559                 last_ep = ep;
560         }
561 
562         /* Avoid starving of endpoints */
563         if ((&isp116x->async)->next != (&isp116x->async)->prev)
564                 list_move(&isp116x->async, (&isp116x->async)->next);
565 
566         if (isp116x->atl_active) {
567                 preproc_atl_queue(isp116x);
568                 pack_fifo(isp116x);
569         }
570 }
571 
572 /*
573   Finish the processed transfers
574 */
575 static void finish_atl_transfers(struct isp116x *isp116x)
576 {
577         if (!isp116x->atl_active)
578                 return;
579         /* Fifo not ready? */
580         if (!(isp116x_read_reg16(isp116x, HCBUFSTAT) & HCBUFSTAT_ATL_DONE))
581                 return;
582 
583         atomic_inc(&isp116x->atl_finishing);
584         unpack_fifo(isp116x);
585         postproc_atl_queue(isp116x);
586         atomic_dec(&isp116x->atl_finishing);
587 }
588 
589 static irqreturn_t isp116x_irq(struct usb_hcd *hcd)
590 {
591         struct isp116x *isp116x = hcd_to_isp116x(hcd);
592         u16 irqstat;
593         irqreturn_t ret = IRQ_NONE;
594 
595         spin_lock(&isp116x->lock);
596         isp116x_write_reg16(isp116x, HCuPINTENB, 0);
597         irqstat = isp116x_read_reg16(isp116x, HCuPINT);
598         isp116x_write_reg16(isp116x, HCuPINT, irqstat);
599 
600         if (irqstat & (HCuPINT_ATL | HCuPINT_SOF)) {
601                 ret = IRQ_HANDLED;
602                 finish_atl_transfers(isp116x);
603         }
604 
605         if (irqstat & HCuPINT_OPR) {
606                 u32 intstat = isp116x_read_reg32(isp116x, HCINTSTAT);
607                 isp116x_write_reg32(isp116x, HCINTSTAT, intstat);
608                 if (intstat & HCINT_UE) {
609                         ERR("Unrecoverable error, HC is dead!\n");
610                         /* IRQ's are off, we do no DMA,
611                            perfectly ready to die ... */
612                         hcd->state = HC_STATE_HALT;
613                         usb_hc_died(hcd);
614                         ret = IRQ_HANDLED;
615                         goto done;
616                 }
617                 if (intstat & HCINT_RHSC)
618                         /* When root hub or any of its ports is going
619                            to come out of suspend, it may take more
620                            than 10ms for status bits to stabilize. */
621                         mod_timer(&hcd->rh_timer, jiffies
622                                   + msecs_to_jiffies(20) + 1);
623                 if (intstat & HCINT_RD) {
624                         DBG("---- remote wakeup\n");
625                         usb_hcd_resume_root_hub(hcd);
626                 }
627                 irqstat &= ~HCuPINT_OPR;
628                 ret = IRQ_HANDLED;
629         }
630 
631         if (irqstat & (HCuPINT_ATL | HCuPINT_SOF)) {
632                 start_atl_transfers(isp116x);
633         }
634 
635         isp116x_write_reg16(isp116x, HCuPINTENB, isp116x->irqenb);
636       done:
637         spin_unlock(&isp116x->lock);
638         return ret;
639 }
640 
641 /*-----------------------------------------------------------------*/
642 
643 /* usb 1.1 says max 90% of a frame is available for periodic transfers.
644  * this driver doesn't promise that much since it's got to handle an
645  * IRQ per packet; irq handling latencies also use up that time.
646  */
647 
648 /* out of 1000 us */
649 #define MAX_PERIODIC_LOAD       600
650 static int balance(struct isp116x *isp116x, u16 period, u16 load)
651 {
652         int i, branch = -ENOSPC;
653 
654         /* search for the least loaded schedule branch of that period
655            which has enough bandwidth left unreserved. */
656         for (i = 0; i < period; i++) {
657                 if (branch < 0 || isp116x->load[branch] > isp116x->load[i]) {
658                         int j;
659 
660                         for (j = i; j < PERIODIC_SIZE; j += period) {
661                                 if ((isp116x->load[j] + load)
662                                     > MAX_PERIODIC_LOAD)
663                                         break;
664                         }
665                         if (j < PERIODIC_SIZE)
666                                 continue;
667                         branch = i;
668                 }
669         }
670         return branch;
671 }
672 
673 /* NB! ALL the code above this point runs with isp116x->lock
674    held, irqs off
675 */
676 
677 /*-----------------------------------------------------------------*/
678 
679 static int isp116x_urb_enqueue(struct usb_hcd *hcd,
680                                struct urb *urb,
681                                gfp_t mem_flags)
682 {
683         struct isp116x *isp116x = hcd_to_isp116x(hcd);
684         struct usb_device *udev = urb->dev;
685         unsigned int pipe = urb->pipe;
686         int is_out = !usb_pipein(pipe);
687         int type = usb_pipetype(pipe);
688         int epnum = usb_pipeendpoint(pipe);
689         struct usb_host_endpoint *hep = urb->ep;
690         struct isp116x_ep *ep = NULL;
691         unsigned long flags;
692         int i;
693         int ret = 0;
694 
695         urb_dbg(urb, "Enqueue");
696 
697         if (type == PIPE_ISOCHRONOUS) {
698                 ERR("Isochronous transfers not supported\n");
699                 urb_dbg(urb, "Refused to enqueue");
700                 return -ENXIO;
701         }
702         /* avoid all allocations within spinlocks: request or endpoint */
703         if (!hep->hcpriv) {
704                 ep = kzalloc(sizeof *ep, mem_flags);
705                 if (!ep)
706                         return -ENOMEM;
707         }
708 
709         spin_lock_irqsave(&isp116x->lock, flags);
710         if (!HC_IS_RUNNING(hcd->state)) {
711                 kfree(ep);
712                 ret = -ENODEV;
713                 goto fail_not_linked;
714         }
715         ret = usb_hcd_link_urb_to_ep(hcd, urb);
716         if (ret) {
717                 kfree(ep);
718                 goto fail_not_linked;
719         }
720 
721         if (hep->hcpriv)
722                 ep = hep->hcpriv;
723         else {
724                 INIT_LIST_HEAD(&ep->schedule);
725                 ep->udev = udev;
726                 ep->epnum = epnum;
727                 ep->maxpacket = usb_maxpacket(udev, urb->pipe, is_out);
728                 usb_settoggle(udev, epnum, is_out, 0);
729 
730                 if (type == PIPE_CONTROL) {
731                         ep->nextpid = USB_PID_SETUP;
732                 } else if (is_out) {
733                         ep->nextpid = USB_PID_OUT;
734                 } else {
735                         ep->nextpid = USB_PID_IN;
736                 }
737 
738                 if (urb->interval) {
739                         /*
740                            With INT URBs submitted, the driver works with SOF
741                            interrupt enabled and ATL interrupt disabled. After
742                            the PTDs are written to fifo ram, the chip starts
743                            fifo processing and usb transfers after the next
744                            SOF and continues until the transfers are finished
745                            (succeeded or failed) or the frame ends. Therefore,
746                            the transfers occur only in every second frame,
747                            while fifo reading/writing and data processing
748                            occur in every other second frame. */
749                         if (urb->interval < 2)
750                                 urb->interval = 2;
751                         if (urb->interval > 2 * PERIODIC_SIZE)
752                                 urb->interval = 2 * PERIODIC_SIZE;
753                         ep->period = urb->interval >> 1;
754                         ep->branch = PERIODIC_SIZE;
755                         ep->load = usb_calc_bus_time(udev->speed,
756                                                      !is_out,
757                                                      (type == PIPE_ISOCHRONOUS),
758                                                      usb_maxpacket(udev, pipe,
759                                                                    is_out)) /
760                             1000;
761                 }
762                 hep->hcpriv = ep;
763                 ep->hep = hep;
764         }
765 
766         /* maybe put endpoint into schedule */
767         switch (type) {
768         case PIPE_CONTROL:
769         case PIPE_BULK:
770                 if (list_empty(&ep->schedule))
771                         list_add_tail(&ep->schedule, &isp116x->async);
772                 break;
773         case PIPE_INTERRUPT:
774                 urb->interval = ep->period;
775                 ep->length = min_t(u32, ep->maxpacket,
776                                  urb->transfer_buffer_length);
777 
778                 /* urb submitted for already existing endpoint */
779                 if (ep->branch < PERIODIC_SIZE)
780                         break;
781 
782                 ep->branch = ret = balance(isp116x, ep->period, ep->load);
783                 if (ret < 0)
784                         goto fail;
785                 ret = 0;
786 
787                 urb->start_frame = (isp116x->fmindex & (PERIODIC_SIZE - 1))
788                     + ep->branch;
789 
790                 /* sort each schedule branch by period (slow before fast)
791                    to share the faster parts of the tree without needing
792                    dummy/placeholder nodes */
793                 DBG("schedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
794                 for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
795                         struct isp116x_ep **prev = &isp116x->periodic[i];
796                         struct isp116x_ep *here = *prev;
797 
798                         while (here && ep != here) {
799                                 if (ep->period > here->period)
800                                         break;
801                                 prev = &here->next;
802                                 here = *prev;
803                         }
804                         if (ep != here) {
805                                 ep->next = here;
806                                 *prev = ep;
807                         }
808                         isp116x->load[i] += ep->load;
809                 }
810                 hcd->self.bandwidth_allocated += ep->load / ep->period;
811 
812                 /* switch over to SOFint */
813                 if (!isp116x->periodic_count++) {
814                         isp116x->irqenb &= ~HCuPINT_ATL;
815                         isp116x->irqenb |= HCuPINT_SOF;
816                         isp116x_write_reg16(isp116x, HCuPINTENB,
817                                             isp116x->irqenb);
818                 }
819         }
820 
821         urb->hcpriv = hep;
822         start_atl_transfers(isp116x);
823 
824       fail:
825         if (ret)
826                 usb_hcd_unlink_urb_from_ep(hcd, urb);
827       fail_not_linked:
828         spin_unlock_irqrestore(&isp116x->lock, flags);
829         return ret;
830 }
831 
832 /*
833    Dequeue URBs.
834 */
835 static int isp116x_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
836                 int status)
837 {
838         struct isp116x *isp116x = hcd_to_isp116x(hcd);
839         struct usb_host_endpoint *hep;
840         struct isp116x_ep *ep, *ep_act;
841         unsigned long flags;
842         int rc;
843 
844         spin_lock_irqsave(&isp116x->lock, flags);
845         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
846         if (rc)
847                 goto done;
848 
849         hep = urb->hcpriv;
850         ep = hep->hcpriv;
851         WARN_ON(hep != ep->hep);
852 
853         /* In front of queue? */
854         if (ep->hep->urb_list.next == &urb->urb_list)
855                 /* active? */
856                 for (ep_act = isp116x->atl_active; ep_act;
857                      ep_act = ep_act->active)
858                         if (ep_act == ep) {
859                                 VDBG("dequeue, urb %p active; wait for irq\n",
860                                      urb);
861                                 urb = NULL;
862                                 break;
863                         }
864 
865         if (urb)
866                 finish_request(isp116x, ep, urb, status);
867  done:
868         spin_unlock_irqrestore(&isp116x->lock, flags);
869         return rc;
870 }
871 
872 static void isp116x_endpoint_disable(struct usb_hcd *hcd,
873                                      struct usb_host_endpoint *hep)
874 {
875         int i;
876         struct isp116x_ep *ep = hep->hcpriv;
877 
878         if (!ep)
879                 return;
880 
881         /* assume we'd just wait for the irq */
882         for (i = 0; i < 100 && !list_empty(&hep->urb_list); i++)
883                 msleep(3);
884         if (!list_empty(&hep->urb_list))
885                 WARNING("ep %p not empty?\n", ep);
886 
887         kfree(ep);
888         hep->hcpriv = NULL;
889 }
890 
891 static int isp116x_get_frame(struct usb_hcd *hcd)
892 {
893         struct isp116x *isp116x = hcd_to_isp116x(hcd);
894         u32 fmnum;
895         unsigned long flags;
896 
897         spin_lock_irqsave(&isp116x->lock, flags);
898         fmnum = isp116x_read_reg32(isp116x, HCFMNUM);
899         spin_unlock_irqrestore(&isp116x->lock, flags);
900         return (int)fmnum;
901 }
902 
903 /*
904   Adapted from ohci-hub.c. Currently we don't support autosuspend.
905 */
906 static int isp116x_hub_status_data(struct usb_hcd *hcd, char *buf)
907 {
908         struct isp116x *isp116x = hcd_to_isp116x(hcd);
909         int ports, i, changed = 0;
910         unsigned long flags;
911 
912         if (!HC_IS_RUNNING(hcd->state))
913                 return -ESHUTDOWN;
914 
915         /* Report no status change now, if we are scheduled to be
916            called later */
917         if (timer_pending(&hcd->rh_timer))
918                 return 0;
919 
920         ports = isp116x->rhdesca & RH_A_NDP;
921         spin_lock_irqsave(&isp116x->lock, flags);
922         isp116x->rhstatus = isp116x_read_reg32(isp116x, HCRHSTATUS);
923         if (isp116x->rhstatus & (RH_HS_LPSC | RH_HS_OCIC))
924                 buf[0] = changed = 1;
925         else
926                 buf[0] = 0;
927 
928         for (i = 0; i < ports; i++) {
929                 u32 status = isp116x_read_reg32(isp116x, i ? HCRHPORT2 : HCRHPORT1);
930 
931                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
932                               | RH_PS_OCIC | RH_PS_PRSC)) {
933                         changed = 1;
934                         buf[0] |= 1 << (i + 1);
935                 }
936         }
937         spin_unlock_irqrestore(&isp116x->lock, flags);
938         return changed;
939 }
940 
941 static void isp116x_hub_descriptor(struct isp116x *isp116x,
942                                    struct usb_hub_descriptor *desc)
943 {
944         u32 reg = isp116x->rhdesca;
945 
946         desc->bDescriptorType = 0x29;
947         desc->bDescLength = 9;
948         desc->bHubContrCurrent = 0;
949         desc->bNbrPorts = (u8) (reg & 0x3);
950         /* Power switching, device type, overcurrent. */
951         desc->wHubCharacteristics = cpu_to_le16((u16) ((reg >> 8) & 0x1f));
952         desc->bPwrOn2PwrGood = (u8) ((reg >> 24) & 0xff);
953         /* ports removable, and legacy PortPwrCtrlMask */
954         desc->u.hs.DeviceRemovable[0] = 0;
955         desc->u.hs.DeviceRemovable[1] = ~0;
956 }
957 
958 /* Perform reset of a given port.
959    It would be great to just start the reset and let the
960    USB core to clear the reset in due time. However,
961    root hub ports should be reset for at least 50 ms, while
962    our chip stays in reset for about 10 ms. I.e., we must
963    repeatedly reset it ourself here.
964 */
965 static inline void root_port_reset(struct isp116x *isp116x, unsigned port)
966 {
967         u32 tmp;
968         unsigned long flags, t;
969 
970         /* Root hub reset should be 50 ms, but some devices
971            want it even longer. */
972         t = jiffies + msecs_to_jiffies(100);
973 
974         while (time_before(jiffies, t)) {
975                 spin_lock_irqsave(&isp116x->lock, flags);
976                 /* spin until any current reset finishes */
977                 for (;;) {
978                         tmp = isp116x_read_reg32(isp116x, port ?
979                                                  HCRHPORT2 : HCRHPORT1);
980                         if (!(tmp & RH_PS_PRS))
981                                 break;
982                         udelay(500);
983                 }
984                 /* Don't reset a disconnected port */
985                 if (!(tmp & RH_PS_CCS)) {
986                         spin_unlock_irqrestore(&isp116x->lock, flags);
987                         break;
988                 }
989                 /* Reset lasts 10ms (claims datasheet) */
990                 isp116x_write_reg32(isp116x, port ? HCRHPORT2 :
991                                     HCRHPORT1, (RH_PS_PRS));
992                 spin_unlock_irqrestore(&isp116x->lock, flags);
993                 msleep(10);
994         }
995 }
996 
997 /* Adapted from ohci-hub.c */
998 static int isp116x_hub_control(struct usb_hcd *hcd,
999                                u16 typeReq,
1000                                u16 wValue, u16 wIndex, char *buf, u16 wLength)
1001 {
1002         struct isp116x *isp116x = hcd_to_isp116x(hcd);
1003         int ret = 0;
1004         unsigned long flags;
1005         int ports = isp116x->rhdesca & RH_A_NDP;
1006         u32 tmp = 0;
1007 
1008         switch (typeReq) {
1009         case ClearHubFeature:
1010                 DBG("ClearHubFeature: ");
1011                 switch (wValue) {
1012                 case C_HUB_OVER_CURRENT:
1013                         DBG("C_HUB_OVER_CURRENT\n");
1014                         spin_lock_irqsave(&isp116x->lock, flags);
1015                         isp116x_write_reg32(isp116x, HCRHSTATUS, RH_HS_OCIC);
1016                         spin_unlock_irqrestore(&isp116x->lock, flags);
1017                 case C_HUB_LOCAL_POWER:
1018                         DBG("C_HUB_LOCAL_POWER\n");
1019                         break;
1020                 default:
1021                         goto error;
1022                 }
1023                 break;
1024         case SetHubFeature:
1025                 DBG("SetHubFeature: ");
1026                 switch (wValue) {
1027                 case C_HUB_OVER_CURRENT:
1028                 case C_HUB_LOCAL_POWER:
1029                         DBG("C_HUB_OVER_CURRENT or C_HUB_LOCAL_POWER\n");
1030                         break;
1031                 default:
1032                         goto error;
1033                 }
1034                 break;
1035         case GetHubDescriptor:
1036                 DBG("GetHubDescriptor\n");
1037                 isp116x_hub_descriptor(isp116x,
1038                                        (struct usb_hub_descriptor *)buf);
1039                 break;
1040         case GetHubStatus:
1041                 DBG("GetHubStatus\n");
1042                 *(__le32 *) buf = 0;
1043                 break;
1044         case GetPortStatus:
1045                 DBG("GetPortStatus\n");
1046                 if (!wIndex || wIndex > ports)
1047                         goto error;
1048                 spin_lock_irqsave(&isp116x->lock, flags);
1049                 tmp = isp116x_read_reg32(isp116x, (--wIndex) ? HCRHPORT2 : HCRHPORT1);
1050                 spin_unlock_irqrestore(&isp116x->lock, flags);
1051                 *(__le32 *) buf = cpu_to_le32(tmp);
1052                 DBG("GetPortStatus: port[%d]  %08x\n", wIndex + 1, tmp);
1053                 break;
1054         case ClearPortFeature:
1055                 DBG("ClearPortFeature: ");
1056                 if (!wIndex || wIndex > ports)
1057                         goto error;
1058                 wIndex--;
1059 
1060                 switch (wValue) {
1061                 case USB_PORT_FEAT_ENABLE:
1062                         DBG("USB_PORT_FEAT_ENABLE\n");
1063                         tmp = RH_PS_CCS;
1064                         break;
1065                 case USB_PORT_FEAT_C_ENABLE:
1066                         DBG("USB_PORT_FEAT_C_ENABLE\n");
1067                         tmp = RH_PS_PESC;
1068                         break;
1069                 case USB_PORT_FEAT_SUSPEND:
1070                         DBG("USB_PORT_FEAT_SUSPEND\n");
1071                         tmp = RH_PS_POCI;
1072                         break;
1073                 case USB_PORT_FEAT_C_SUSPEND:
1074                         DBG("USB_PORT_FEAT_C_SUSPEND\n");
1075                         tmp = RH_PS_PSSC;
1076                         break;
1077                 case USB_PORT_FEAT_POWER:
1078                         DBG("USB_PORT_FEAT_POWER\n");
1079                         tmp = RH_PS_LSDA;
1080                         break;
1081                 case USB_PORT_FEAT_C_CONNECTION:
1082                         DBG("USB_PORT_FEAT_C_CONNECTION\n");
1083                         tmp = RH_PS_CSC;
1084                         break;
1085                 case USB_PORT_FEAT_C_OVER_CURRENT:
1086                         DBG("USB_PORT_FEAT_C_OVER_CURRENT\n");
1087                         tmp = RH_PS_OCIC;
1088                         break;
1089                 case USB_PORT_FEAT_C_RESET:
1090                         DBG("USB_PORT_FEAT_C_RESET\n");
1091                         tmp = RH_PS_PRSC;
1092                         break;
1093                 default:
1094                         goto error;
1095                 }
1096                 spin_lock_irqsave(&isp116x->lock, flags);
1097                 isp116x_write_reg32(isp116x, wIndex
1098                                     ? HCRHPORT2 : HCRHPORT1, tmp);
1099                 spin_unlock_irqrestore(&isp116x->lock, flags);
1100                 break;
1101         case SetPortFeature:
1102                 DBG("SetPortFeature: ");
1103                 if (!wIndex || wIndex > ports)
1104                         goto error;
1105                 wIndex--;
1106                 switch (wValue) {
1107                 case USB_PORT_FEAT_SUSPEND:
1108                         DBG("USB_PORT_FEAT_SUSPEND\n");
1109                         spin_lock_irqsave(&isp116x->lock, flags);
1110                         isp116x_write_reg32(isp116x, wIndex
1111                                             ? HCRHPORT2 : HCRHPORT1, RH_PS_PSS);
1112                         spin_unlock_irqrestore(&isp116x->lock, flags);
1113                         break;
1114                 case USB_PORT_FEAT_POWER:
1115                         DBG("USB_PORT_FEAT_POWER\n");
1116                         spin_lock_irqsave(&isp116x->lock, flags);
1117                         isp116x_write_reg32(isp116x, wIndex
1118                                             ? HCRHPORT2 : HCRHPORT1, RH_PS_PPS);
1119                         spin_unlock_irqrestore(&isp116x->lock, flags);
1120                         break;
1121                 case USB_PORT_FEAT_RESET:
1122                         DBG("USB_PORT_FEAT_RESET\n");
1123                         root_port_reset(isp116x, wIndex);
1124                         break;
1125                 default:
1126                         goto error;
1127                 }
1128                 break;
1129 
1130         default:
1131               error:
1132                 /* "protocol stall" on error */
1133                 DBG("PROTOCOL STALL\n");
1134                 ret = -EPIPE;
1135         }
1136         return ret;
1137 }
1138 
1139 /*-----------------------------------------------------------------*/
1140 
1141 #ifdef CONFIG_DEBUG_FS
1142 
1143 static void dump_irq(struct seq_file *s, char *label, u16 mask)
1144 {
1145         seq_printf(s, "%s %04x%s%s%s%s%s%s\n", label, mask,
1146                    mask & HCuPINT_CLKRDY ? " clkrdy" : "",
1147                    mask & HCuPINT_SUSP ? " susp" : "",
1148                    mask & HCuPINT_OPR ? " opr" : "",
1149                    mask & HCuPINT_AIIEOT ? " eot" : "",
1150                    mask & HCuPINT_ATL ? " atl" : "",
1151                    mask & HCuPINT_SOF ? " sof" : "");
1152 }
1153 
1154 static void dump_int(struct seq_file *s, char *label, u32 mask)
1155 {
1156         seq_printf(s, "%s %08x%s%s%s%s%s%s%s\n", label, mask,
1157                    mask & HCINT_MIE ? " MIE" : "",
1158                    mask & HCINT_RHSC ? " rhsc" : "",
1159                    mask & HCINT_FNO ? " fno" : "",
1160                    mask & HCINT_UE ? " ue" : "",
1161                    mask & HCINT_RD ? " rd" : "",
1162                    mask & HCINT_SF ? " sof" : "", mask & HCINT_SO ? " so" : "");
1163 }
1164 
1165 static int isp116x_show_dbg(struct seq_file *s, void *unused)
1166 {
1167         struct isp116x *isp116x = s->private;
1168 
1169         seq_printf(s, "%s\n%s version %s\n",
1170                    isp116x_to_hcd(isp116x)->product_desc, hcd_name,
1171                    DRIVER_VERSION);
1172 
1173         if (HC_IS_SUSPENDED(isp116x_to_hcd(isp116x)->state)) {
1174                 seq_printf(s, "HCD is suspended\n");
1175                 return 0;
1176         }
1177         if (!HC_IS_RUNNING(isp116x_to_hcd(isp116x)->state)) {
1178                 seq_printf(s, "HCD not running\n");
1179                 return 0;
1180         }
1181 
1182         spin_lock_irq(&isp116x->lock);
1183         dump_irq(s, "hc_irq_enable", isp116x_read_reg16(isp116x, HCuPINTENB));
1184         dump_irq(s, "hc_irq_status", isp116x_read_reg16(isp116x, HCuPINT));
1185         dump_int(s, "hc_int_enable", isp116x_read_reg32(isp116x, HCINTENB));
1186         dump_int(s, "hc_int_status", isp116x_read_reg32(isp116x, HCINTSTAT));
1187         isp116x_show_regs_seq(isp116x, s);
1188         spin_unlock_irq(&isp116x->lock);
1189         seq_printf(s, "\n");
1190 
1191         return 0;
1192 }
1193 
1194 static int isp116x_open_seq(struct inode *inode, struct file *file)
1195 {
1196         return single_open(file, isp116x_show_dbg, inode->i_private);
1197 }
1198 
1199 static const struct file_operations isp116x_debug_fops = {
1200         .open = isp116x_open_seq,
1201         .read = seq_read,
1202         .llseek = seq_lseek,
1203         .release = single_release,
1204 };
1205 
1206 static int create_debug_file(struct isp116x *isp116x)
1207 {
1208         isp116x->dentry = debugfs_create_file(hcd_name,
1209                                               S_IRUGO, NULL, isp116x,
1210                                               &isp116x_debug_fops);
1211         if (!isp116x->dentry)
1212                 return -ENOMEM;
1213         return 0;
1214 }
1215 
1216 static void remove_debug_file(struct isp116x *isp116x)
1217 {
1218         debugfs_remove(isp116x->dentry);
1219 }
1220 
1221 #else
1222 
1223 #define create_debug_file(d)    0
1224 #define remove_debug_file(d)    do{}while(0)
1225 
1226 #endif                          /* CONFIG_DEBUG_FS */
1227 
1228 /*-----------------------------------------------------------------*/
1229 
1230 /*
1231   Software reset - can be called from any contect.
1232 */
1233 static int isp116x_sw_reset(struct isp116x *isp116x)
1234 {
1235         int retries = 15;
1236         unsigned long flags;
1237         int ret = 0;
1238 
1239         spin_lock_irqsave(&isp116x->lock, flags);
1240         isp116x_write_reg16(isp116x, HCSWRES, HCSWRES_MAGIC);
1241         isp116x_write_reg32(isp116x, HCCMDSTAT, HCCMDSTAT_HCR);
1242         while (--retries) {
1243                 /* It usually resets within 1 ms */
1244                 mdelay(1);
1245                 if (!(isp116x_read_reg32(isp116x, HCCMDSTAT) & HCCMDSTAT_HCR))
1246                         break;
1247         }
1248         if (!retries) {
1249                 ERR("Software reset timeout\n");
1250                 ret = -ETIME;
1251         }
1252         spin_unlock_irqrestore(&isp116x->lock, flags);
1253         return ret;
1254 }
1255 
1256 static int isp116x_reset(struct usb_hcd *hcd)
1257 {
1258         struct isp116x *isp116x = hcd_to_isp116x(hcd);
1259         unsigned long t;
1260         u16 clkrdy = 0;
1261         int ret, timeout = 15 /* ms */ ;
1262 
1263         ret = isp116x_sw_reset(isp116x);
1264         if (ret)
1265                 return ret;
1266 
1267         t = jiffies + msecs_to_jiffies(timeout);
1268         while (time_before_eq(jiffies, t)) {
1269                 msleep(4);
1270                 spin_lock_irq(&isp116x->lock);
1271                 clkrdy = isp116x_read_reg16(isp116x, HCuPINT) & HCuPINT_CLKRDY;
1272                 spin_unlock_irq(&isp116x->lock);
1273                 if (clkrdy)
1274                         break;
1275         }
1276         if (!clkrdy) {
1277                 ERR("Clock not ready after %dms\n", timeout);
1278                 /* After sw_reset the clock won't report to be ready, if
1279                    H_WAKEUP pin is high. */
1280                 ERR("Please make sure that the H_WAKEUP pin is pulled low!\n");
1281                 ret = -ENODEV;
1282         }
1283         return ret;
1284 }
1285 
1286 static void isp116x_stop(struct usb_hcd *hcd)
1287 {
1288         struct isp116x *isp116x = hcd_to_isp116x(hcd);
1289         unsigned long flags;
1290         u32 val;
1291 
1292         spin_lock_irqsave(&isp116x->lock, flags);
1293         isp116x_write_reg16(isp116x, HCuPINTENB, 0);
1294 
1295         /* Switch off ports' power, some devices don't come up
1296            after next 'insmod' without this */
1297         val = isp116x_read_reg32(isp116x, HCRHDESCA);
1298         val &= ~(RH_A_NPS | RH_A_PSM);
1299         isp116x_write_reg32(isp116x, HCRHDESCA, val);
1300         isp116x_write_reg32(isp116x, HCRHSTATUS, RH_HS_LPS);
1301         spin_unlock_irqrestore(&isp116x->lock, flags);
1302 
1303         isp116x_sw_reset(isp116x);
1304 }
1305 
1306 /*
1307   Configure the chip. The chip must be successfully reset by now.
1308 */
1309 static int isp116x_start(struct usb_hcd *hcd)
1310 {
1311         struct isp116x *isp116x = hcd_to_isp116x(hcd);
1312         struct isp116x_platform_data *board = isp116x->board;
1313         u32 val;
1314         unsigned long flags;
1315 
1316         spin_lock_irqsave(&isp116x->lock, flags);
1317 
1318         /* clear interrupt status and disable all interrupt sources */
1319         isp116x_write_reg16(isp116x, HCuPINT, 0xff);
1320         isp116x_write_reg16(isp116x, HCuPINTENB, 0);
1321 
1322         val = isp116x_read_reg16(isp116x, HCCHIPID);
1323         if ((val & HCCHIPID_MASK) != HCCHIPID_MAGIC) {
1324                 ERR("Invalid chip ID %04x\n", val);
1325                 spin_unlock_irqrestore(&isp116x->lock, flags);
1326                 return -ENODEV;
1327         }
1328 
1329         /* To be removed in future */
1330         hcd->uses_new_polling = 1;
1331 
1332         isp116x_write_reg16(isp116x, HCITLBUFLEN, ISP116x_ITL_BUFSIZE);
1333         isp116x_write_reg16(isp116x, HCATLBUFLEN, ISP116x_ATL_BUFSIZE);
1334 
1335         /* ----- HW conf */
1336         val = HCHWCFG_INT_ENABLE | HCHWCFG_DBWIDTH(1);
1337         if (board->sel15Kres)
1338                 val |= HCHWCFG_15KRSEL;
1339         /* Remote wakeup won't work without working clock */
1340         if (board->remote_wakeup_enable)
1341                 val |= HCHWCFG_CLKNOTSTOP;
1342         if (board->oc_enable)
1343                 val |= HCHWCFG_ANALOG_OC;
1344         if (board->int_act_high)
1345                 val |= HCHWCFG_INT_POL;
1346         if (board->int_edge_triggered)
1347                 val |= HCHWCFG_INT_TRIGGER;
1348         isp116x_write_reg16(isp116x, HCHWCFG, val);
1349 
1350         /* ----- Root hub conf */
1351         val = (25 << 24) & RH_A_POTPGT;
1352         /* AN10003_1.pdf recommends RH_A_NPS (no power switching) to
1353            be always set. Yet, instead, we request individual port
1354            power switching. */
1355         val |= RH_A_PSM;
1356         /* Report overcurrent per port */
1357         val |= RH_A_OCPM;
1358         isp116x_write_reg32(isp116x, HCRHDESCA, val);
1359         isp116x->rhdesca = isp116x_read_reg32(isp116x, HCRHDESCA);
1360 
1361         val = RH_B_PPCM;
1362         isp116x_write_reg32(isp116x, HCRHDESCB, val);
1363         isp116x->rhdescb = isp116x_read_reg32(isp116x, HCRHDESCB);
1364 
1365         val = 0;
1366         if (board->remote_wakeup_enable) {
1367                 if (!device_can_wakeup(hcd->self.controller))
1368                         device_init_wakeup(hcd->self.controller, 1);
1369                 val |= RH_HS_DRWE;
1370         }
1371         isp116x_write_reg32(isp116x, HCRHSTATUS, val);
1372         isp116x->rhstatus = isp116x_read_reg32(isp116x, HCRHSTATUS);
1373 
1374         isp116x_write_reg32(isp116x, HCFMINTVL, 0x27782edf);
1375 
1376         hcd->state = HC_STATE_RUNNING;
1377 
1378         /* Set up interrupts */
1379         isp116x->intenb = HCINT_MIE | HCINT_RHSC | HCINT_UE;
1380         if (board->remote_wakeup_enable)
1381                 isp116x->intenb |= HCINT_RD;
1382         isp116x->irqenb = HCuPINT_ATL | HCuPINT_OPR;    /* | HCuPINT_SUSP; */
1383         isp116x_write_reg32(isp116x, HCINTENB, isp116x->intenb);
1384         isp116x_write_reg16(isp116x, HCuPINTENB, isp116x->irqenb);
1385 
1386         /* Go operational */
1387         val = HCCONTROL_USB_OPER;
1388         if (board->remote_wakeup_enable)
1389                 val |= HCCONTROL_RWE;
1390         isp116x_write_reg32(isp116x, HCCONTROL, val);
1391 
1392         /* Disable ports to avoid race in device enumeration */
1393         isp116x_write_reg32(isp116x, HCRHPORT1, RH_PS_CCS);
1394         isp116x_write_reg32(isp116x, HCRHPORT2, RH_PS_CCS);
1395 
1396         isp116x_show_regs_log(isp116x);
1397         spin_unlock_irqrestore(&isp116x->lock, flags);
1398         return 0;
1399 }
1400 
1401 #ifdef  CONFIG_PM
1402 
1403 static int isp116x_bus_suspend(struct usb_hcd *hcd)
1404 {
1405         struct isp116x *isp116x = hcd_to_isp116x(hcd);
1406         unsigned long flags;
1407         u32 val;
1408         int ret = 0;
1409 
1410         spin_lock_irqsave(&isp116x->lock, flags);
1411         val = isp116x_read_reg32(isp116x, HCCONTROL);
1412 
1413         switch (val & HCCONTROL_HCFS) {
1414         case HCCONTROL_USB_OPER:
1415                 spin_unlock_irqrestore(&isp116x->lock, flags);
1416                 val &= (~HCCONTROL_HCFS & ~HCCONTROL_RWE);
1417                 val |= HCCONTROL_USB_SUSPEND;
1418                 if (hcd->self.root_hub->do_remote_wakeup)
1419                         val |= HCCONTROL_RWE;
1420                 /* Wait for usb transfers to finish */
1421                 msleep(2);
1422                 spin_lock_irqsave(&isp116x->lock, flags);
1423                 isp116x_write_reg32(isp116x, HCCONTROL, val);
1424                 spin_unlock_irqrestore(&isp116x->lock, flags);
1425                 /* Wait for devices to suspend */
1426                 msleep(5);
1427                 break;
1428         case HCCONTROL_USB_RESUME:
1429                 isp116x_write_reg32(isp116x, HCCONTROL,
1430                                     (val & ~HCCONTROL_HCFS) |
1431                                     HCCONTROL_USB_RESET);
1432         case HCCONTROL_USB_RESET:
1433                 ret = -EBUSY;
1434         default:                /* HCCONTROL_USB_SUSPEND */
1435                 spin_unlock_irqrestore(&isp116x->lock, flags);
1436                 break;
1437         }
1438 
1439         return ret;
1440 }
1441 
1442 static int isp116x_bus_resume(struct usb_hcd *hcd)
1443 {
1444         struct isp116x *isp116x = hcd_to_isp116x(hcd);
1445         u32 val;
1446 
1447         msleep(5);
1448         spin_lock_irq(&isp116x->lock);
1449 
1450         val = isp116x_read_reg32(isp116x, HCCONTROL);
1451         switch (val & HCCONTROL_HCFS) {
1452         case HCCONTROL_USB_SUSPEND:
1453                 val &= ~HCCONTROL_HCFS;
1454                 val |= HCCONTROL_USB_RESUME;
1455                 isp116x_write_reg32(isp116x, HCCONTROL, val);
1456         case HCCONTROL_USB_RESUME:
1457                 break;
1458         case HCCONTROL_USB_OPER:
1459                 spin_unlock_irq(&isp116x->lock);
1460                 return 0;
1461         default:
1462                 /* HCCONTROL_USB_RESET: this may happen, when during
1463                    suspension the HC lost power. Reinitialize completely */
1464                 spin_unlock_irq(&isp116x->lock);
1465                 DBG("Chip has been reset while suspended. Reinit from scratch.\n");
1466                 isp116x_reset(hcd);
1467                 isp116x_start(hcd);
1468                 isp116x_hub_control(hcd, SetPortFeature,
1469                                     USB_PORT_FEAT_POWER, 1, NULL, 0);
1470                 if ((isp116x->rhdesca & RH_A_NDP) == 2)
1471                         isp116x_hub_control(hcd, SetPortFeature,
1472                                             USB_PORT_FEAT_POWER, 2, NULL, 0);
1473                 return 0;
1474         }
1475 
1476         val = isp116x->rhdesca & RH_A_NDP;
1477         while (val--) {
1478                 u32 stat =
1479                     isp116x_read_reg32(isp116x, val ? HCRHPORT2 : HCRHPORT1);
1480                 /* force global, not selective, resume */
1481                 if (!(stat & RH_PS_PSS))
1482                         continue;
1483                 DBG("%s: Resuming port %d\n", __func__, val);
1484                 isp116x_write_reg32(isp116x, RH_PS_POCI, val
1485                                     ? HCRHPORT2 : HCRHPORT1);
1486         }
1487         spin_unlock_irq(&isp116x->lock);
1488 
1489         hcd->state = HC_STATE_RESUMING;
1490         msleep(20);
1491 
1492         /* Go operational */
1493         spin_lock_irq(&isp116x->lock);
1494         val = isp116x_read_reg32(isp116x, HCCONTROL);
1495         isp116x_write_reg32(isp116x, HCCONTROL,
1496                             (val & ~HCCONTROL_HCFS) | HCCONTROL_USB_OPER);
1497         spin_unlock_irq(&isp116x->lock);
1498         hcd->state = HC_STATE_RUNNING;
1499 
1500         return 0;
1501 }
1502 
1503 #else
1504 
1505 #define isp116x_bus_suspend     NULL
1506 #define isp116x_bus_resume      NULL
1507 
1508 #endif
1509 
1510 static struct hc_driver isp116x_hc_driver = {
1511         .description = hcd_name,
1512         .product_desc = "ISP116x Host Controller",
1513         .hcd_priv_size = sizeof(struct isp116x),
1514 
1515         .irq = isp116x_irq,
1516         .flags = HCD_USB11,
1517 
1518         .reset = isp116x_reset,
1519         .start = isp116x_start,
1520         .stop = isp116x_stop,
1521 
1522         .urb_enqueue = isp116x_urb_enqueue,
1523         .urb_dequeue = isp116x_urb_dequeue,
1524         .endpoint_disable = isp116x_endpoint_disable,
1525 
1526         .get_frame_number = isp116x_get_frame,
1527 
1528         .hub_status_data = isp116x_hub_status_data,
1529         .hub_control = isp116x_hub_control,
1530         .bus_suspend = isp116x_bus_suspend,
1531         .bus_resume = isp116x_bus_resume,
1532 };
1533 
1534 /*----------------------------------------------------------------*/
1535 
1536 static int isp116x_remove(struct platform_device *pdev)
1537 {
1538         struct usb_hcd *hcd = platform_get_drvdata(pdev);
1539         struct isp116x *isp116x;
1540         struct resource *res;
1541 
1542         if (!hcd)
1543                 return 0;
1544         isp116x = hcd_to_isp116x(hcd);
1545         remove_debug_file(isp116x);
1546         usb_remove_hcd(hcd);
1547 
1548         iounmap(isp116x->data_reg);
1549         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1550         release_mem_region(res->start, 2);
1551         iounmap(isp116x->addr_reg);
1552         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1553         release_mem_region(res->start, 2);
1554 
1555         usb_put_hcd(hcd);
1556         return 0;
1557 }
1558 
1559 static int isp116x_probe(struct platform_device *pdev)
1560 {
1561         struct usb_hcd *hcd;
1562         struct isp116x *isp116x;
1563         struct resource *addr, *data, *ires;
1564         void __iomem *addr_reg;
1565         void __iomem *data_reg;
1566         int irq;
1567         int ret = 0;
1568         unsigned long irqflags;
1569 
1570         if (usb_disabled())
1571                 return -ENODEV;
1572 
1573         if (pdev->num_resources < 3) {
1574                 ret = -ENODEV;
1575                 goto err1;
1576         }
1577 
1578         data = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1579         addr = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1580         ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1581 
1582         if (!addr || !data || !ires) {
1583                 ret = -ENODEV;
1584                 goto err1;
1585         }
1586 
1587         irq = ires->start;
1588         irqflags = ires->flags & IRQF_TRIGGER_MASK;
1589 
1590         if (pdev->dev.dma_mask) {
1591                 DBG("DMA not supported\n");
1592                 ret = -EINVAL;
1593                 goto err1;
1594         }
1595 
1596         if (!request_mem_region(addr->start, 2, hcd_name)) {
1597                 ret = -EBUSY;
1598                 goto err1;
1599         }
1600         addr_reg = ioremap(addr->start, resource_size(addr));
1601         if (addr_reg == NULL) {
1602                 ret = -ENOMEM;
1603                 goto err2;
1604         }
1605         if (!request_mem_region(data->start, 2, hcd_name)) {
1606                 ret = -EBUSY;
1607                 goto err3;
1608         }
1609         data_reg = ioremap(data->start, resource_size(data));
1610         if (data_reg == NULL) {
1611                 ret = -ENOMEM;
1612                 goto err4;
1613         }
1614 
1615         /* allocate and initialize hcd */
1616         hcd = usb_create_hcd(&isp116x_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1617         if (!hcd) {
1618                 ret = -ENOMEM;
1619                 goto err5;
1620         }
1621         /* this rsrc_start is bogus */
1622         hcd->rsrc_start = addr->start;
1623         isp116x = hcd_to_isp116x(hcd);
1624         isp116x->data_reg = data_reg;
1625         isp116x->addr_reg = addr_reg;
1626         spin_lock_init(&isp116x->lock);
1627         INIT_LIST_HEAD(&isp116x->async);
1628         isp116x->board = dev_get_platdata(&pdev->dev);
1629 
1630         if (!isp116x->board) {
1631                 ERR("Platform data structure not initialized\n");
1632                 ret = -ENODEV;
1633                 goto err6;
1634         }
1635         if (isp116x_check_platform_delay(isp116x)) {
1636                 ERR("USE_PLATFORM_DELAY defined, but delay function not "
1637                     "implemented.\n");
1638                 ERR("See comments in drivers/usb/host/isp116x-hcd.c\n");
1639                 ret = -ENODEV;
1640                 goto err6;
1641         }
1642 
1643         ret = usb_add_hcd(hcd, irq, irqflags);
1644         if (ret)
1645                 goto err6;
1646 
1647         device_wakeup_enable(hcd->self.controller);
1648 
1649         ret = create_debug_file(isp116x);
1650         if (ret) {
1651                 ERR("Couldn't create debugfs entry\n");
1652                 goto err7;
1653         }
1654 
1655         return 0;
1656 
1657       err7:
1658         usb_remove_hcd(hcd);
1659       err6:
1660         usb_put_hcd(hcd);
1661       err5:
1662         iounmap(data_reg);
1663       err4:
1664         release_mem_region(data->start, 2);
1665       err3:
1666         iounmap(addr_reg);
1667       err2:
1668         release_mem_region(addr->start, 2);
1669       err1:
1670         ERR("init error, %d\n", ret);
1671         return ret;
1672 }
1673 
1674 #ifdef  CONFIG_PM
1675 /*
1676   Suspend of platform device
1677 */
1678 static int isp116x_suspend(struct platform_device *dev, pm_message_t state)
1679 {
1680         VDBG("%s: state %x\n", __func__, state.event);
1681         return 0;
1682 }
1683 
1684 /*
1685   Resume platform device
1686 */
1687 static int isp116x_resume(struct platform_device *dev)
1688 {
1689         VDBG("%s\n", __func__);
1690         return 0;
1691 }
1692 
1693 #else
1694 
1695 #define isp116x_suspend    NULL
1696 #define isp116x_resume     NULL
1697 
1698 #endif
1699 
1700 /* work with hotplug and coldplug */
1701 MODULE_ALIAS("platform:isp116x-hcd");
1702 
1703 static struct platform_driver isp116x_driver = {
1704         .probe = isp116x_probe,
1705         .remove = isp116x_remove,
1706         .suspend = isp116x_suspend,
1707         .resume = isp116x_resume,
1708         .driver = {
1709                 .name = hcd_name,
1710                 .owner  = THIS_MODULE,
1711         },
1712 };
1713 
1714 module_platform_driver(isp116x_driver);
1715 

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