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lseek(fd, n, SEEK_END) does *not* go to eof - n
[linux-2.6/ubuntu-intrepid-eeepc.git] / drivers / usb / host / imx21-hcd.c
blobf0ebe8e7c58b4dced4d50617b7a6235d90143cac
1 /*
2 * USB Host Controller Driver for IMX21
3 *
4 * Copyright (C) 2006 Loping Dog Embedded Systems
5 * Copyright (C) 2009 Martin Fuzzey
6 * Originally written by Jay Monkman <jtm@lopingdog.com>
7 * Ported to 2.6.30, debugged and enhanced by Martin Fuzzey
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 * for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24
25 /*
26 * The i.MX21 USB hardware contains
27 * * 32 transfer descriptors (called ETDs)
28 * * 4Kb of Data memory
29 *
30 * The data memory is shared between the host and function controllers
31 * (but this driver only supports the host controller)
32 *
33 * So setting up a transfer involves:
34 * * Allocating a ETD
35 * * Fill in ETD with appropriate information
36 * * Allocating data memory (and putting the offset in the ETD)
37 * * Activate the ETD
38 * * Get interrupt when done.
39 *
40 * An ETD is assigned to each active endpoint.
41 *
42 * Low resource (ETD and Data memory) situations are handled differently for
43 * isochronous and non insosynchronous transactions :
44 *
45 * Non ISOC transfers are queued if either ETDs or Data memory are unavailable
46 *
47 * ISOC transfers use 2 ETDs per endpoint to achieve double buffering.
48 * They allocate both ETDs and Data memory during URB submission
49 * (and fail if unavailable).
50 */
51
52 #include <linux/clk.h>
53 #include <linux/io.h>
54 #include <linux/kernel.h>
55 #include <linux/list.h>
56 #include <linux/platform_device.h>
57 #include <linux/slab.h>
58 #include <linux/usb.h>
59 #include <linux/usb/hcd.h>
60 #include <linux/dma-mapping.h>
61 #include <linux/module.h>
62
63 #include "imx21-hcd.h"
64
65 #ifdef DEBUG
66 #define DEBUG_LOG_FRAME(imx21, etd, event) \
67 (etd)->event##_frame = readl((imx21)->regs + USBH_FRMNUB)
68 #else
69 #define DEBUG_LOG_FRAME(imx21, etd, event) do { } while (0)
70 #endif
71
72 static const char hcd_name[] = "imx21-hcd";
73
74 static inline struct imx21 *hcd_to_imx21(struct usb_hcd *hcd)
75 {
76 return (struct imx21 *)hcd->hcd_priv;
77 }
78
79
80 /* =========================================== */
81 /* Hardware access helpers */
82 /* =========================================== */
83
84 static inline void set_register_bits(struct imx21 *imx21, u32 offset, u32 mask)
85 {
86 void __iomem *reg = imx21->regs + offset;
87 writel(readl(reg) | mask, reg);
88 }
89
90 static inline void clear_register_bits(struct imx21 *imx21,
91 u32 offset, u32 mask)
92 {
93 void __iomem *reg = imx21->regs + offset;
94 writel(readl(reg) & ~mask, reg);
95 }
96
97 static inline void clear_toggle_bit(struct imx21 *imx21, u32 offset, u32 mask)
98 {
99 void __iomem *reg = imx21->regs + offset;
100
101 if (readl(reg) & mask)
102 writel(mask, reg);
103 }
104
105 static inline void set_toggle_bit(struct imx21 *imx21, u32 offset, u32 mask)
106 {
107 void __iomem *reg = imx21->regs + offset;
108
109 if (!(readl(reg) & mask))
110 writel(mask, reg);
111 }
112
113 static void etd_writel(struct imx21 *imx21, int etd_num, int dword, u32 value)
114 {
115 writel(value, imx21->regs + USB_ETD_DWORD(etd_num, dword));
116 }
117
118 static u32 etd_readl(struct imx21 *imx21, int etd_num, int dword)
119 {
120 return readl(imx21->regs + USB_ETD_DWORD(etd_num, dword));
121 }
122
123 static inline int wrap_frame(int counter)
124 {
125 return counter & 0xFFFF;
126 }
127
128 static inline int frame_after(int frame, int after)
129 {
130 /* handle wrapping like jiffies time_afer */
131 return (s16)((s16)after - (s16)frame) < 0;
132 }
133
134 static int imx21_hc_get_frame(struct usb_hcd *hcd)
135 {
136 struct imx21 *imx21 = hcd_to_imx21(hcd);
137
138 return wrap_frame(readl(imx21->regs + USBH_FRMNUB));
139 }
140
141 static inline bool unsuitable_for_dma(dma_addr_t addr)
142 {
143 return (addr & 3) != 0;
144 }
145
146 #include "imx21-dbg.c"
147
148 static void nonisoc_urb_completed_for_etd(
149 struct imx21 *imx21, struct etd_priv *etd, int status);
150 static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb);
151 static void free_dmem(struct imx21 *imx21, struct etd_priv *etd);
152
153 /* =========================================== */
154 /* ETD management */
155 /* =========================================== */
156
157 static int alloc_etd(struct imx21 *imx21)
158 {
159 int i;
160 struct etd_priv *etd = imx21->etd;
161
162 for (i = 0; i < USB_NUM_ETD; i++, etd++) {
163 if (etd->alloc == 0) {
164 memset(etd, 0, sizeof(imx21->etd[0]));
165 etd->alloc = 1;
166 debug_etd_allocated(imx21);
167 return i;
168 }
169 }
170 return -1;
171 }
172
173 static void disactivate_etd(struct imx21 *imx21, int num)
174 {
175 int etd_mask = (1 << num);
176 struct etd_priv *etd = &imx21->etd[num];
177
178 writel(etd_mask, imx21->regs + USBH_ETDENCLR);
179 clear_register_bits(imx21, USBH_ETDDONEEN, etd_mask);
180 writel(etd_mask, imx21->regs + USB_ETDDMACHANLCLR);
181 clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask);
182
183 etd->active_count = 0;
184
185 DEBUG_LOG_FRAME(imx21, etd, disactivated);
186 }
187
188 static void reset_etd(struct imx21 *imx21, int num)
189 {
190 struct etd_priv *etd = imx21->etd + num;
191 int i;
192
193 disactivate_etd(imx21, num);
194
195 for (i = 0; i < 4; i++)
196 etd_writel(imx21, num, i, 0);
197 etd->urb = NULL;
198 etd->ep = NULL;
199 etd->td = NULL;
200 etd->bounce_buffer = NULL;
201 }
202
203 static void free_etd(struct imx21 *imx21, int num)
204 {
205 if (num < 0)
206 return;
207
208 if (num >= USB_NUM_ETD) {
209 dev_err(imx21->dev, "BAD etd=%d!\n", num);
210 return;
211 }
212 if (imx21->etd[num].alloc == 0) {
213 dev_err(imx21->dev, "ETD %d already free!\n", num);
214 return;
215 }
216
217 debug_etd_freed(imx21);
218 reset_etd(imx21, num);
219 memset(&imx21->etd[num], 0, sizeof(imx21->etd[0]));
220 }
221
222
223 static void setup_etd_dword0(struct imx21 *imx21,
224 int etd_num, struct urb *urb, u8 dir, u16 maxpacket)
225 {
226 etd_writel(imx21, etd_num, 0,
227 ((u32) usb_pipedevice(urb->pipe)) << DW0_ADDRESS |
228 ((u32) usb_pipeendpoint(urb->pipe) << DW0_ENDPNT) |
229 ((u32) dir << DW0_DIRECT) |
230 ((u32) ((urb->dev->speed == USB_SPEED_LOW) ?
231 1 : 0) << DW0_SPEED) |
232 ((u32) fmt_urb_to_etd[usb_pipetype(urb->pipe)] << DW0_FORMAT) |
233 ((u32) maxpacket << DW0_MAXPKTSIZ));
234 }
235
236 /**
237 * Copy buffer to data controller data memory.
238 * We cannot use memcpy_toio() because the hardware requires 32bit writes
239 */
240 static void copy_to_dmem(
241 struct imx21 *imx21, int dmem_offset, void *src, int count)
242 {
243 void __iomem *dmem = imx21->regs + USBOTG_DMEM + dmem_offset;
244 u32 word = 0;
245 u8 *p = src;
246 int byte = 0;
247 int i;
248
249 for (i = 0; i < count; i++) {
250 byte = i % 4;
251 word += (*p++ << (byte * 8));
252 if (byte == 3) {
253 writel(word, dmem);
254 dmem += 4;
255 word = 0;
256 }
257 }
258
259 if (count && byte != 3)
260 writel(word, dmem);
261 }
262
263 static void activate_etd(struct imx21 *imx21, int etd_num, u8 dir)
264 {
265 u32 etd_mask = 1 << etd_num;
266 struct etd_priv *etd = &imx21->etd[etd_num];
267
268 if (etd->dma_handle && unsuitable_for_dma(etd->dma_handle)) {
269 /* For non aligned isoc the condition below is always true */
270 if (etd->len <= etd->dmem_size) {
271 /* Fits into data memory, use PIO */
272 if (dir != TD_DIR_IN) {
273 copy_to_dmem(imx21,
274 etd->dmem_offset,
275 etd->cpu_buffer, etd->len);
276 }
277 etd->dma_handle = 0;
278
279 } else {
280 /* Too big for data memory, use bounce buffer */
281 enum dma_data_direction dmadir;
282
283 if (dir == TD_DIR_IN) {
284 dmadir = DMA_FROM_DEVICE;
285 etd->bounce_buffer = kmalloc(etd->len,
286 GFP_ATOMIC);
287 } else {
288 dmadir = DMA_TO_DEVICE;
289 etd->bounce_buffer = kmemdup(etd->cpu_buffer,
290 etd->len,
291 GFP_ATOMIC);
292 }
293 if (!etd->bounce_buffer) {
294 dev_err(imx21->dev, "failed bounce alloc\n");
295 goto err_bounce_alloc;
296 }
297
298 etd->dma_handle =
299 dma_map_single(imx21->dev,
300 etd->bounce_buffer,
301 etd->len,
302 dmadir);
303 if (dma_mapping_error(imx21->dev, etd->dma_handle)) {
304 dev_err(imx21->dev, "failed bounce map\n");
305 goto err_bounce_map;
306 }
307 }
308 }
309
310 clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask);
311 set_register_bits(imx21, USBH_ETDDONEEN, etd_mask);
312 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
313 clear_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
314
315 if (etd->dma_handle) {
316 set_register_bits(imx21, USB_ETDDMACHANLCLR, etd_mask);
317 clear_toggle_bit(imx21, USBH_XBUFSTAT, etd_mask);
318 clear_toggle_bit(imx21, USBH_YBUFSTAT, etd_mask);
319 writel(etd->dma_handle, imx21->regs + USB_ETDSMSA(etd_num));
320 set_register_bits(imx21, USB_ETDDMAEN, etd_mask);
321 } else {
322 if (dir != TD_DIR_IN) {
323 /* need to set for ZLP and PIO */
324 set_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
325 set_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
326 }
327 }
328
329 DEBUG_LOG_FRAME(imx21, etd, activated);
330
331 #ifdef DEBUG
332 if (!etd->active_count) {
333 int i;
334 etd->activated_frame = readl(imx21->regs + USBH_FRMNUB);
335 etd->disactivated_frame = -1;
336 etd->last_int_frame = -1;
337 etd->last_req_frame = -1;
338
339 for (i = 0; i < 4; i++)
340 etd->submitted_dwords[i] = etd_readl(imx21, etd_num, i);
341 }
342 #endif
343
344 etd->active_count = 1;
345 writel(etd_mask, imx21->regs + USBH_ETDENSET);
346 return;
347
348 err_bounce_map:
349 kfree(etd->bounce_buffer);
350
351 err_bounce_alloc:
352 free_dmem(imx21, etd);
353 nonisoc_urb_completed_for_etd(imx21, etd, -ENOMEM);
354 }
355
356 /* =========================================== */
357 /* Data memory management */
358 /* =========================================== */
359
360 static int alloc_dmem(struct imx21 *imx21, unsigned int size,
361 struct usb_host_endpoint *ep)
362 {
363 unsigned int offset = 0;
364 struct imx21_dmem_area *area;
365 struct imx21_dmem_area *tmp;
366
367 size += (~size + 1) & 0x3; /* Round to 4 byte multiple */
368
369 if (size > DMEM_SIZE) {
370 dev_err(imx21->dev, "size=%d > DMEM_SIZE(%d)\n",
371 size, DMEM_SIZE);
372 return -EINVAL;
373 }
374
375 list_for_each_entry(tmp, &imx21->dmem_list, list) {
376 if ((size + offset) < offset)
377 goto fail;
378 if ((size + offset) <= tmp->offset)
379 break;
380 offset = tmp->size + tmp->offset;
381 if ((offset + size) > DMEM_SIZE)
382 goto fail;
383 }
384
385 area = kmalloc(sizeof(struct imx21_dmem_area), GFP_ATOMIC);
386 if (area == NULL)
387 return -ENOMEM;
388
389 area->ep = ep;
390 area->offset = offset;
391 area->size = size;
392 list_add_tail(&area->list, &tmp->list);
393 debug_dmem_allocated(imx21, size);
394 return offset;
395
396 fail:
397 return -ENOMEM;
398 }
399
400 /* Memory now available for a queued ETD - activate it */
401 static void activate_queued_etd(struct imx21 *imx21,
402 struct etd_priv *etd, u32 dmem_offset)
403 {
404 struct urb_priv *urb_priv = etd->urb->hcpriv;
405 int etd_num = etd - &imx21->etd[0];
406 u32 maxpacket = etd_readl(imx21, etd_num, 1) >> DW1_YBUFSRTAD;
407 u8 dir = (etd_readl(imx21, etd_num, 2) >> DW2_DIRPID) & 0x03;
408
409 dev_dbg(imx21->dev, "activating queued ETD %d now DMEM available\n",
410 etd_num);
411 etd_writel(imx21, etd_num, 1,
412 ((dmem_offset + maxpacket) << DW1_YBUFSRTAD) | dmem_offset);
413
414 etd->dmem_offset = dmem_offset;
415 urb_priv->active = 1;
416 activate_etd(imx21, etd_num, dir);
417 }
418
419 static void free_dmem(struct imx21 *imx21, struct etd_priv *etd)
420 {
421 struct imx21_dmem_area *area;
422 struct etd_priv *tmp;
423 int found = 0;
424 int offset;
425
426 if (!etd->dmem_size)
427 return;
428 etd->dmem_size = 0;
429
430 offset = etd->dmem_offset;
431 list_for_each_entry(area, &imx21->dmem_list, list) {
432 if (area->offset == offset) {
433 debug_dmem_freed(imx21, area->size);
434 list_del(&area->list);
435 kfree(area);
436 found = 1;
437 break;
438 }
439 }
440
441 if (!found) {
442 dev_err(imx21->dev,
443 "Trying to free unallocated DMEM %d\n", offset);
444 return;
445 }
446
447 /* Try again to allocate memory for anything we've queued */
448 list_for_each_entry_safe(etd, tmp, &imx21->queue_for_dmem, queue) {
449 offset = alloc_dmem(imx21, etd->dmem_size, etd->ep);
450 if (offset >= 0) {
451 list_del(&etd->queue);
452 activate_queued_etd(imx21, etd, (u32)offset);
453 }
454 }
455 }
456
457 static void free_epdmem(struct imx21 *imx21, struct usb_host_endpoint *ep)
458 {
459 struct imx21_dmem_area *area, *tmp;
460
461 list_for_each_entry_safe(area, tmp, &imx21->dmem_list, list) {
462 if (area->ep == ep) {
463 dev_err(imx21->dev,
464 "Active DMEM %d for disabled ep=%p\n",
465 area->offset, ep);
466 list_del(&area->list);
467 kfree(area);
468 }
469 }
470 }
471
472
473 /* =========================================== */
474 /* End handling */
475 /* =========================================== */
476
477 /* Endpoint now idle - release its ETD(s) or assign to queued request */
478 static void ep_idle(struct imx21 *imx21, struct ep_priv *ep_priv)
479 {
480 int i;
481
482 for (i = 0; i < NUM_ISO_ETDS; i++) {
483 int etd_num = ep_priv->etd[i];
484 struct etd_priv *etd;
485 if (etd_num < 0)
486 continue;
487
488 etd = &imx21->etd[etd_num];
489 ep_priv->etd[i] = -1;
490
491 free_dmem(imx21, etd); /* for isoc */
492
493 if (list_empty(&imx21->queue_for_etd)) {
494 free_etd(imx21, etd_num);
495 continue;
496 }
497
498 dev_dbg(imx21->dev,
499 "assigning idle etd %d for queued request\n", etd_num);
500 ep_priv = list_first_entry(&imx21->queue_for_etd,
501 struct ep_priv, queue);
502 list_del(&ep_priv->queue);
503 reset_etd(imx21, etd_num);
504 ep_priv->waiting_etd = 0;
505 ep_priv->etd[i] = etd_num;
506
507 if (list_empty(&ep_priv->ep->urb_list)) {
508 dev_err(imx21->dev, "No urb for queued ep!\n");
509 continue;
510 }
511 schedule_nonisoc_etd(imx21, list_first_entry(
512 &ep_priv->ep->urb_list, struct urb, urb_list));
513 }
514 }
515
516 static void urb_done(struct usb_hcd *hcd, struct urb *urb, int status)
517 __releases(imx21->lock)
518 __acquires(imx21->lock)
519 {
520 struct imx21 *imx21 = hcd_to_imx21(hcd);
521 struct ep_priv *ep_priv = urb->ep->hcpriv;
522 struct urb_priv *urb_priv = urb->hcpriv;
523
524 debug_urb_completed(imx21, urb, status);
525 dev_vdbg(imx21->dev, "urb %p done %d\n", urb, status);
526
527 kfree(urb_priv->isoc_td);
528 kfree(urb->hcpriv);
529 urb->hcpriv = NULL;
530 usb_hcd_unlink_urb_from_ep(hcd, urb);
531 spin_unlock(&imx21->lock);
532 usb_hcd_giveback_urb(hcd, urb, status);
533 spin_lock(&imx21->lock);
534 if (list_empty(&ep_priv->ep->urb_list))
535 ep_idle(imx21, ep_priv);
536 }
537
538 static void nonisoc_urb_completed_for_etd(
539 struct imx21 *imx21, struct etd_priv *etd, int status)
540 {
541 struct usb_host_endpoint *ep = etd->ep;
542
543 urb_done(imx21->hcd, etd->urb, status);
544 etd->urb = NULL;
545
546 if (!list_empty(&ep->urb_list)) {
547 struct urb *urb = list_first_entry(
548 &ep->urb_list, struct urb, urb_list);
549
550 dev_vdbg(imx21->dev, "next URB %p\n", urb);
551 schedule_nonisoc_etd(imx21, urb);
552 }
553 }
554
555
556 /* =========================================== */
557 /* ISOC Handling ... */
558 /* =========================================== */
559
560 static void schedule_isoc_etds(struct usb_hcd *hcd,
561 struct usb_host_endpoint *ep)
562 {
563 struct imx21 *imx21 = hcd_to_imx21(hcd);
564 struct ep_priv *ep_priv = ep->hcpriv;
565 struct etd_priv *etd;
566 struct urb_priv *urb_priv;
567 struct td *td;
568 int etd_num;
569 int i;
570 int cur_frame;
571 u8 dir;
572
573 for (i = 0; i < NUM_ISO_ETDS; i++) {
574 too_late:
575 if (list_empty(&ep_priv->td_list))
576 break;
577
578 etd_num = ep_priv->etd[i];
579 if (etd_num < 0)
580 break;
581
582 etd = &imx21->etd[etd_num];
583 if (etd->urb)
584 continue;
585
586 td = list_entry(ep_priv->td_list.next, struct td, list);
587 list_del(&td->list);
588 urb_priv = td->urb->hcpriv;
589
590 cur_frame = imx21_hc_get_frame(hcd);
591 if (frame_after(cur_frame, td->frame)) {
592 dev_dbg(imx21->dev, "isoc too late frame %d > %d\n",
593 cur_frame, td->frame);
594 urb_priv->isoc_status = -EXDEV;
595 td->urb->iso_frame_desc[
596 td->isoc_index].actual_length = 0;
597 td->urb->iso_frame_desc[td->isoc_index].status = -EXDEV;
598 if (--urb_priv->isoc_remaining == 0)
599 urb_done(hcd, td->urb, urb_priv->isoc_status);
600 goto too_late;
601 }
602
603 urb_priv->active = 1;
604 etd->td = td;
605 etd->ep = td->ep;
606 etd->urb = td->urb;
607 etd->len = td->len;
608 etd->dma_handle = td->dma_handle;
609 etd->cpu_buffer = td->cpu_buffer;
610
611 debug_isoc_submitted(imx21, cur_frame, td);
612
613 dir = usb_pipeout(td->urb->pipe) ? TD_DIR_OUT : TD_DIR_IN;
614 setup_etd_dword0(imx21, etd_num, td->urb, dir, etd->dmem_size);
615 etd_writel(imx21, etd_num, 1, etd->dmem_offset);
616 etd_writel(imx21, etd_num, 2,
617 (TD_NOTACCESSED << DW2_COMPCODE) |
618 ((td->frame & 0xFFFF) << DW2_STARTFRM));
619 etd_writel(imx21, etd_num, 3,
620 (TD_NOTACCESSED << DW3_COMPCODE0) |
621 (td->len << DW3_PKTLEN0));
622
623 activate_etd(imx21, etd_num, dir);
624 }
625 }
626
627 static void isoc_etd_done(struct usb_hcd *hcd, int etd_num)
628 {
629 struct imx21 *imx21 = hcd_to_imx21(hcd);
630 int etd_mask = 1 << etd_num;
631 struct etd_priv *etd = imx21->etd + etd_num;
632 struct urb *urb = etd->urb;
633 struct urb_priv *urb_priv = urb->hcpriv;
634 struct td *td = etd->td;
635 struct usb_host_endpoint *ep = etd->ep;
636 int isoc_index = td->isoc_index;
637 unsigned int pipe = urb->pipe;
638 int dir_in = usb_pipein(pipe);
639 int cc;
640 int bytes_xfrd;
641
642 disactivate_etd(imx21, etd_num);
643
644 cc = (etd_readl(imx21, etd_num, 3) >> DW3_COMPCODE0) & 0xf;
645 bytes_xfrd = etd_readl(imx21, etd_num, 3) & 0x3ff;
646
647 /* Input doesn't always fill the buffer, don't generate an error
648 * when this happens.
649 */
650 if (dir_in && (cc == TD_DATAUNDERRUN))
651 cc = TD_CC_NOERROR;
652
653 if (cc == TD_NOTACCESSED)
654 bytes_xfrd = 0;
655
656 debug_isoc_completed(imx21,
657 imx21_hc_get_frame(hcd), td, cc, bytes_xfrd);
658 if (cc) {
659 urb_priv->isoc_status = -EXDEV;
660 dev_dbg(imx21->dev,
661 "bad iso cc=0x%X frame=%d sched frame=%d "
662 "cnt=%d len=%d urb=%p etd=%d index=%d\n",
663 cc, imx21_hc_get_frame(hcd), td->frame,
664 bytes_xfrd, td->len, urb, etd_num, isoc_index);
665 }
666
667 if (dir_in) {
668 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
669 if (!etd->dma_handle)
670 memcpy_fromio(etd->cpu_buffer,
671 imx21->regs + USBOTG_DMEM + etd->dmem_offset,
672 bytes_xfrd);
673 }
674
675 urb->actual_length += bytes_xfrd;
676 urb->iso_frame_desc[isoc_index].actual_length = bytes_xfrd;
677 urb->iso_frame_desc[isoc_index].status = cc_to_error[cc];
678
679 etd->td = NULL;
680 etd->urb = NULL;
681 etd->ep = NULL;
682
683 if (--urb_priv->isoc_remaining == 0)
684 urb_done(hcd, urb, urb_priv->isoc_status);
685
686 schedule_isoc_etds(hcd, ep);
687 }
688
689 static struct ep_priv *alloc_isoc_ep(
690 struct imx21 *imx21, struct usb_host_endpoint *ep)
691 {
692 struct ep_priv *ep_priv;
693 int i;
694
695 ep_priv = kzalloc(sizeof(struct ep_priv), GFP_ATOMIC);
696 if (!ep_priv)
697 return NULL;
698
699 for (i = 0; i < NUM_ISO_ETDS; i++)
700 ep_priv->etd[i] = -1;
701
702 INIT_LIST_HEAD(&ep_priv->td_list);
703 ep_priv->ep = ep;
704 ep->hcpriv = ep_priv;
705 return ep_priv;
706 }
707
708 static int alloc_isoc_etds(struct imx21 *imx21, struct ep_priv *ep_priv)
709 {
710 int i, j;
711 int etd_num;
712
713 /* Allocate the ETDs if required */
714 for (i = 0; i < NUM_ISO_ETDS; i++) {
715 if (ep_priv->etd[i] < 0) {
716 etd_num = alloc_etd(imx21);
717 if (etd_num < 0)
718 goto alloc_etd_failed;
719
720 ep_priv->etd[i] = etd_num;
721 imx21->etd[etd_num].ep = ep_priv->ep;
722 }
723 }
724 return 0;
725
726 alloc_etd_failed:
727 dev_err(imx21->dev, "isoc: Couldn't allocate etd\n");
728 for (j = 0; j < i; j++) {
729 free_etd(imx21, ep_priv->etd[j]);
730 ep_priv->etd[j] = -1;
731 }
732 return -ENOMEM;
733 }
734
735 static int imx21_hc_urb_enqueue_isoc(struct usb_hcd *hcd,
736 struct usb_host_endpoint *ep,
737 struct urb *urb, gfp_t mem_flags)
738 {
739 struct imx21 *imx21 = hcd_to_imx21(hcd);
740 struct urb_priv *urb_priv;
741 unsigned long flags;
742 struct ep_priv *ep_priv;
743 struct td *td = NULL;
744 int i;
745 int ret;
746 int cur_frame;
747 u16 maxpacket;
748
749 urb_priv = kzalloc(sizeof(struct urb_priv), mem_flags);
750 if (urb_priv == NULL)
751 return -ENOMEM;
752
753 urb_priv->isoc_td = kzalloc(
754 sizeof(struct td) * urb->number_of_packets, mem_flags);
755 if (urb_priv->isoc_td == NULL) {
756 ret = -ENOMEM;
757 goto alloc_td_failed;
758 }
759
760 spin_lock_irqsave(&imx21->lock, flags);
761
762 if (ep->hcpriv == NULL) {
763 ep_priv = alloc_isoc_ep(imx21, ep);
764 if (ep_priv == NULL) {
765 ret = -ENOMEM;
766 goto alloc_ep_failed;
767 }
768 } else {
769 ep_priv = ep->hcpriv;
770 }
771
772 ret = alloc_isoc_etds(imx21, ep_priv);
773 if (ret)
774 goto alloc_etd_failed;
775
776 ret = usb_hcd_link_urb_to_ep(hcd, urb);
777 if (ret)
778 goto link_failed;
779
780 urb->status = -EINPROGRESS;
781 urb->actual_length = 0;
782 urb->error_count = 0;
783 urb->hcpriv = urb_priv;
784 urb_priv->ep = ep;
785
786 /* allocate data memory for largest packets if not already done */
787 maxpacket = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
788 for (i = 0; i < NUM_ISO_ETDS; i++) {
789 struct etd_priv *etd = &imx21->etd[ep_priv->etd[i]];
790
791 if (etd->dmem_size > 0 && etd->dmem_size < maxpacket) {
792 /* not sure if this can really occur.... */
793 dev_err(imx21->dev, "increasing isoc buffer %d->%d\n",
794 etd->dmem_size, maxpacket);
795 ret = -EMSGSIZE;
796 goto alloc_dmem_failed;
797 }
798
799 if (etd->dmem_size == 0) {
800 etd->dmem_offset = alloc_dmem(imx21, maxpacket, ep);
801 if (etd->dmem_offset < 0) {
802 dev_dbg(imx21->dev, "failed alloc isoc dmem\n");
803 ret = -EAGAIN;
804 goto alloc_dmem_failed;
805 }
806 etd->dmem_size = maxpacket;
807 }
808 }
809
810 /* calculate frame */
811 cur_frame = imx21_hc_get_frame(hcd);
812 if (urb->transfer_flags & URB_ISO_ASAP) {
813 if (list_empty(&ep_priv->td_list))
814 urb->start_frame = cur_frame + 5;
815 else
816 urb->start_frame = list_entry(
817 ep_priv->td_list.prev,
818 struct td, list)->frame + urb->interval;
819 }
820 urb->start_frame = wrap_frame(urb->start_frame);
821 if (frame_after(cur_frame, urb->start_frame)) {
822 dev_dbg(imx21->dev,
823 "enqueue: adjusting iso start %d (cur=%d) asap=%d\n",
824 urb->start_frame, cur_frame,
825 (urb->transfer_flags & URB_ISO_ASAP) != 0);
826 urb->start_frame = wrap_frame(cur_frame + 1);
827 }
828
829 /* set up transfers */
830 td = urb_priv->isoc_td;
831 for (i = 0; i < urb->number_of_packets; i++, td++) {
832 unsigned int offset = urb->iso_frame_desc[i].offset;
833 td->ep = ep;
834 td->urb = urb;
835 td->len = urb->iso_frame_desc[i].length;
836 td->isoc_index = i;
837 td->frame = wrap_frame(urb->start_frame + urb->interval * i);
838 td->dma_handle = urb->transfer_dma + offset;
839 td->cpu_buffer = urb->transfer_buffer + offset;
840 list_add_tail(&td->list, &ep_priv->td_list);
841 }
842
843 urb_priv->isoc_remaining = urb->number_of_packets;
844 dev_vdbg(imx21->dev, "setup %d packets for iso frame %d->%d\n",
845 urb->number_of_packets, urb->start_frame, td->frame);
846
847 debug_urb_submitted(imx21, urb);
848 schedule_isoc_etds(hcd, ep);
849
850 spin_unlock_irqrestore(&imx21->lock, flags);
851 return 0;
852
853 alloc_dmem_failed:
854 usb_hcd_unlink_urb_from_ep(hcd, urb);
855
856 link_failed:
857 alloc_etd_failed:
858 alloc_ep_failed:
859 spin_unlock_irqrestore(&imx21->lock, flags);
860 kfree(urb_priv->isoc_td);
861
862 alloc_td_failed:
863 kfree(urb_priv);
864 return ret;
865 }
866
867 static void dequeue_isoc_urb(struct imx21 *imx21,
868 struct urb *urb, struct ep_priv *ep_priv)
869 {
870 struct urb_priv *urb_priv = urb->hcpriv;
871 struct td *td, *tmp;
872 int i;
873
874 if (urb_priv->active) {
875 for (i = 0; i < NUM_ISO_ETDS; i++) {
876 int etd_num = ep_priv->etd[i];
877 if (etd_num != -1 && imx21->etd[etd_num].urb == urb) {
878 struct etd_priv *etd = imx21->etd + etd_num;
879
880 reset_etd(imx21, etd_num);
881 free_dmem(imx21, etd);
882 }
883 }
884 }
885
886 list_for_each_entry_safe(td, tmp, &ep_priv->td_list, list) {
887 if (td->urb == urb) {
888 dev_vdbg(imx21->dev, "removing td %p\n", td);
889 list_del(&td->list);
890 }
891 }
892 }
893
894 /* =========================================== */
895 /* NON ISOC Handling ... */
896 /* =========================================== */
897
898 static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb)
899 {
900 unsigned int pipe = urb->pipe;
901 struct urb_priv *urb_priv = urb->hcpriv;
902 struct ep_priv *ep_priv = urb_priv->ep->hcpriv;
903 int state = urb_priv->state;
904 int etd_num = ep_priv->etd[0];
905 struct etd_priv *etd;
906 u32 count;
907 u16 etd_buf_size;
908 u16 maxpacket;
909 u8 dir;
910 u8 bufround;
911 u8 datatoggle;
912 u8 interval = 0;
913 u8 relpolpos = 0;
914
915 if (etd_num < 0) {
916 dev_err(imx21->dev, "No valid ETD\n");
917 return;
918 }
919 if (readl(imx21->regs + USBH_ETDENSET) & (1 << etd_num))
920 dev_err(imx21->dev, "submitting to active ETD %d\n", etd_num);
921
922 etd = &imx21->etd[etd_num];
923 maxpacket = usb_maxpacket(urb->dev, pipe, usb_pipeout(pipe));
924 if (!maxpacket)
925 maxpacket = 8;
926
927 if (usb_pipecontrol(pipe) && (state != US_CTRL_DATA)) {
928 if (state == US_CTRL_SETUP) {
929 dir = TD_DIR_SETUP;
930 if (unsuitable_for_dma(urb->setup_dma))
931 usb_hcd_unmap_urb_setup_for_dma(imx21->hcd,
932 urb);
933 etd->dma_handle = urb->setup_dma;
934 etd->cpu_buffer = urb->setup_packet;
935 bufround = 0;
936 count = 8;
937 datatoggle = TD_TOGGLE_DATA0;
938 } else { /* US_CTRL_ACK */
939 dir = usb_pipeout(pipe) ? TD_DIR_IN : TD_DIR_OUT;
940 bufround = 0;
941 count = 0;
942 datatoggle = TD_TOGGLE_DATA1;
943 }
944 } else {
945 dir = usb_pipeout(pipe) ? TD_DIR_OUT : TD_DIR_IN;
946 bufround = (dir == TD_DIR_IN) ? 1 : 0;
947 if (unsuitable_for_dma(urb->transfer_dma))
948 usb_hcd_unmap_urb_for_dma(imx21->hcd, urb);
949
950 etd->dma_handle = urb->transfer_dma;
951 etd->cpu_buffer = urb->transfer_buffer;
952 if (usb_pipebulk(pipe) && (state == US_BULK0))
953 count = 0;
954 else
955 count = urb->transfer_buffer_length;
956
957 if (usb_pipecontrol(pipe)) {
958 datatoggle = TD_TOGGLE_DATA1;
959 } else {
960 if (usb_gettoggle(
961 urb->dev,
962 usb_pipeendpoint(urb->pipe),
963 usb_pipeout(urb->pipe)))
964 datatoggle = TD_TOGGLE_DATA1;
965 else
966 datatoggle = TD_TOGGLE_DATA0;
967 }
968 }
969
970 etd->urb = urb;
971 etd->ep = urb_priv->ep;
972 etd->len = count;
973
974 if (usb_pipeint(pipe)) {
975 interval = urb->interval;
976 relpolpos = (readl(imx21->regs + USBH_FRMNUB) + 1) & 0xff;
977 }
978
979 /* Write ETD to device memory */
980 setup_etd_dword0(imx21, etd_num, urb, dir, maxpacket);
981
982 etd_writel(imx21, etd_num, 2,
983 (u32) interval << DW2_POLINTERV |
984 ((u32) relpolpos << DW2_RELPOLPOS) |
985 ((u32) dir << DW2_DIRPID) |
986 ((u32) bufround << DW2_BUFROUND) |
987 ((u32) datatoggle << DW2_DATATOG) |
988 ((u32) TD_NOTACCESSED << DW2_COMPCODE));
989
990 /* DMA will always transfer buffer size even if TOBYCNT in DWORD3
991 is smaller. Make sure we don't overrun the buffer!
992 */
993 if (count && count < maxpacket)
994 etd_buf_size = count;
995 else
996 etd_buf_size = maxpacket;
997
998 etd_writel(imx21, etd_num, 3,
999 ((u32) (etd_buf_size - 1) << DW3_BUFSIZE) | (u32) count);
1000
1001 if (!count)
1002 etd->dma_handle = 0;
1003
1004 /* allocate x and y buffer space at once */
1005 etd->dmem_size = (count > maxpacket) ? maxpacket * 2 : maxpacket;
1006 etd->dmem_offset = alloc_dmem(imx21, etd->dmem_size, urb_priv->ep);
1007 if (etd->dmem_offset < 0) {
1008 /* Setup everything we can in HW and update when we get DMEM */
1009 etd_writel(imx21, etd_num, 1, (u32)maxpacket << 16);
1010
1011 dev_dbg(imx21->dev, "Queuing etd %d for DMEM\n", etd_num);
1012 debug_urb_queued_for_dmem(imx21, urb);
1013 list_add_tail(&etd->queue, &imx21->queue_for_dmem);
1014 return;
1015 }
1016
1017 etd_writel(imx21, etd_num, 1,
1018 (((u32) etd->dmem_offset + (u32) maxpacket) << DW1_YBUFSRTAD) |
1019 (u32) etd->dmem_offset);
1020
1021 urb_priv->active = 1;
1022
1023 /* enable the ETD to kick off transfer */
1024 dev_vdbg(imx21->dev, "Activating etd %d for %d bytes %s\n",
1025 etd_num, count, dir != TD_DIR_IN ? "out" : "in");
1026 activate_etd(imx21, etd_num, dir);
1027
1028 }
1029
1030 static void nonisoc_etd_done(struct usb_hcd *hcd, int etd_num)
1031 {
1032 struct imx21 *imx21 = hcd_to_imx21(hcd);
1033 struct etd_priv *etd = &imx21->etd[etd_num];
1034 struct urb *urb = etd->urb;
1035 u32 etd_mask = 1 << etd_num;
1036 struct urb_priv *urb_priv = urb->hcpriv;
1037 int dir;
1038 int cc;
1039 u32 bytes_xfrd;
1040 int etd_done;
1041
1042 disactivate_etd(imx21, etd_num);
1043
1044 dir = (etd_readl(imx21, etd_num, 0) >> DW0_DIRECT) & 0x3;
1045 cc = (etd_readl(imx21, etd_num, 2) >> DW2_COMPCODE) & 0xf;
1046 bytes_xfrd = etd->len - (etd_readl(imx21, etd_num, 3) & 0x1fffff);
1047
1048 /* save toggle carry */
1049 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
1050 usb_pipeout(urb->pipe),
1051 (etd_readl(imx21, etd_num, 0) >> DW0_TOGCRY) & 0x1);
1052
1053 if (dir == TD_DIR_IN) {
1054 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
1055 clear_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
1056
1057 if (etd->bounce_buffer) {
1058 memcpy(etd->cpu_buffer, etd->bounce_buffer, bytes_xfrd);
1059 dma_unmap_single(imx21->dev,
1060 etd->dma_handle, etd->len, DMA_FROM_DEVICE);
1061 } else if (!etd->dma_handle && bytes_xfrd) {/* PIO */
1062 memcpy_fromio(etd->cpu_buffer,
1063 imx21->regs + USBOTG_DMEM + etd->dmem_offset,
1064 bytes_xfrd);
1065 }
1066 }
1067
1068 kfree(etd->bounce_buffer);
1069 etd->bounce_buffer = NULL;
1070 free_dmem(imx21, etd);
1071
1072 urb->error_count = 0;
1073 if (!(urb->transfer_flags & URB_SHORT_NOT_OK)
1074 && (cc == TD_DATAUNDERRUN))
1075 cc = TD_CC_NOERROR;
1076
1077 if (cc != 0)
1078 dev_vdbg(imx21->dev, "cc is 0x%x\n", cc);
1079
1080 etd_done = (cc_to_error[cc] != 0); /* stop if error */
1081
1082 switch (usb_pipetype(urb->pipe)) {
1083 case PIPE_CONTROL:
1084 switch (urb_priv->state) {
1085 case US_CTRL_SETUP:
1086 if (urb->transfer_buffer_length > 0)
1087 urb_priv->state = US_CTRL_DATA;
1088 else
1089 urb_priv->state = US_CTRL_ACK;
1090 break;
1091 case US_CTRL_DATA:
1092 urb->actual_length += bytes_xfrd;
1093 urb_priv->state = US_CTRL_ACK;
1094 break;
1095 case US_CTRL_ACK:
1096 etd_done = 1;
1097 break;
1098 default:
1099 dev_err(imx21->dev,
1100 "Invalid pipe state %d\n", urb_priv->state);
1101 etd_done = 1;
1102 break;
1103 }
1104 break;
1105
1106 case PIPE_BULK:
1107 urb->actual_length += bytes_xfrd;
1108 if ((urb_priv->state == US_BULK)
1109 && (urb->transfer_flags & URB_ZERO_PACKET)
1110 && urb->transfer_buffer_length > 0
1111 && ((urb->transfer_buffer_length %
1112 usb_maxpacket(urb->dev, urb->pipe,
1113 usb_pipeout(urb->pipe))) == 0)) {
1114 /* need a 0-packet */
1115 urb_priv->state = US_BULK0;
1116 } else {
1117 etd_done = 1;
1118 }
1119 break;
1120
1121 case PIPE_INTERRUPT:
1122 urb->actual_length += bytes_xfrd;
1123 etd_done = 1;
1124 break;
1125 }
1126
1127 if (etd_done)
1128 nonisoc_urb_completed_for_etd(imx21, etd, cc_to_error[cc]);
1129 else {
1130 dev_vdbg(imx21->dev, "next state=%d\n", urb_priv->state);
1131 schedule_nonisoc_etd(imx21, urb);
1132 }
1133 }
1134
1135
1136 static struct ep_priv *alloc_ep(void)
1137 {
1138 int i;
1139 struct ep_priv *ep_priv;
1140
1141 ep_priv = kzalloc(sizeof(struct ep_priv), GFP_ATOMIC);
1142 if (!ep_priv)
1143 return NULL;
1144
1145 for (i = 0; i < NUM_ISO_ETDS; ++i)
1146 ep_priv->etd[i] = -1;
1147
1148 return ep_priv;
1149 }
1150
1151 static int imx21_hc_urb_enqueue(struct usb_hcd *hcd,
1152 struct urb *urb, gfp_t mem_flags)
1153 {
1154 struct imx21 *imx21 = hcd_to_imx21(hcd);
1155 struct usb_host_endpoint *ep = urb->ep;
1156 struct urb_priv *urb_priv;
1157 struct ep_priv *ep_priv;
1158 struct etd_priv *etd;
1159 int ret;
1160 unsigned long flags;
1161
1162 dev_vdbg(imx21->dev,
1163 "enqueue urb=%p ep=%p len=%d "
1164 "buffer=%p dma=%08X setupBuf=%p setupDma=%08X\n",
1165 urb, ep,
1166 urb->transfer_buffer_length,
1167 urb->transfer_buffer, urb->transfer_dma,
1168 urb->setup_packet, urb->setup_dma);
1169
1170 if (usb_pipeisoc(urb->pipe))
1171 return imx21_hc_urb_enqueue_isoc(hcd, ep, urb, mem_flags);
1172
1173 urb_priv = kzalloc(sizeof(struct urb_priv), mem_flags);
1174 if (!urb_priv)
1175 return -ENOMEM;
1176
1177 spin_lock_irqsave(&imx21->lock, flags);
1178
1179 ep_priv = ep->hcpriv;
1180 if (ep_priv == NULL) {
1181 ep_priv = alloc_ep();
1182 if (!ep_priv) {
1183 ret = -ENOMEM;
1184 goto failed_alloc_ep;
1185 }
1186 ep->hcpriv = ep_priv;
1187 ep_priv->ep = ep;
1188 }
1189
1190 ret = usb_hcd_link_urb_to_ep(hcd, urb);
1191 if (ret)
1192 goto failed_link;
1193
1194 urb->status = -EINPROGRESS;
1195 urb->actual_length = 0;
1196 urb->error_count = 0;
1197 urb->hcpriv = urb_priv;
1198 urb_priv->ep = ep;
1199
1200 switch (usb_pipetype(urb->pipe)) {
1201 case PIPE_CONTROL:
1202 urb_priv->state = US_CTRL_SETUP;
1203 break;
1204 case PIPE_BULK:
1205 urb_priv->state = US_BULK;
1206 break;
1207 }
1208
1209 debug_urb_submitted(imx21, urb);
1210 if (ep_priv->etd[0] < 0) {
1211 if (ep_priv->waiting_etd) {
1212 dev_dbg(imx21->dev,
1213 "no ETD available already queued %p\n",
1214 ep_priv);
1215 debug_urb_queued_for_etd(imx21, urb);
1216 goto out;
1217 }
1218 ep_priv->etd[0] = alloc_etd(imx21);
1219 if (ep_priv->etd[0] < 0) {
1220 dev_dbg(imx21->dev,
1221 "no ETD available queueing %p\n", ep_priv);
1222 debug_urb_queued_for_etd(imx21, urb);
1223 list_add_tail(&ep_priv->queue, &imx21->queue_for_etd);
1224 ep_priv->waiting_etd = 1;
1225 goto out;
1226 }
1227 }
1228
1229 /* Schedule if no URB already active for this endpoint */
1230 etd = &imx21->etd[ep_priv->etd[0]];
1231 if (etd->urb == NULL) {
1232 DEBUG_LOG_FRAME(imx21, etd, last_req);
1233 schedule_nonisoc_etd(imx21, urb);
1234 }
1235
1236 out:
1237 spin_unlock_irqrestore(&imx21->lock, flags);
1238 return 0;
1239
1240 failed_link:
1241 failed_alloc_ep:
1242 spin_unlock_irqrestore(&imx21->lock, flags);
1243 kfree(urb_priv);
1244 return ret;
1245 }
1246
1247 static int imx21_hc_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
1248 int status)
1249 {
1250 struct imx21 *imx21 = hcd_to_imx21(hcd);
1251 unsigned long flags;
1252 struct usb_host_endpoint *ep;
1253 struct ep_priv *ep_priv;
1254 struct urb_priv *urb_priv = urb->hcpriv;
1255 int ret = -EINVAL;
1256
1257 dev_vdbg(imx21->dev, "dequeue urb=%p iso=%d status=%d\n",
1258 urb, usb_pipeisoc(urb->pipe), status);
1259
1260 spin_lock_irqsave(&imx21->lock, flags);
1261
1262 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
1263 if (ret)
1264 goto fail;
1265 ep = urb_priv->ep;
1266 ep_priv = ep->hcpriv;
1267
1268 debug_urb_unlinked(imx21, urb);
1269
1270 if (usb_pipeisoc(urb->pipe)) {
1271 dequeue_isoc_urb(imx21, urb, ep_priv);
1272 schedule_isoc_etds(hcd, ep);
1273 } else if (urb_priv->active) {
1274 int etd_num = ep_priv->etd[0];
1275 if (etd_num != -1) {
1276 struct etd_priv *etd = &imx21->etd[etd_num];
1277
1278 disactivate_etd(imx21, etd_num);
1279 free_dmem(imx21, etd);
1280 etd->urb = NULL;
1281 kfree(etd->bounce_buffer);
1282 etd->bounce_buffer = NULL;
1283 }
1284 }
1285
1286 urb_done(hcd, urb, status);
1287
1288 spin_unlock_irqrestore(&imx21->lock, flags);
1289 return 0;
1290
1291 fail:
1292 spin_unlock_irqrestore(&imx21->lock, flags);
1293 return ret;
1294 }
1295
1296 /* =========================================== */
1297 /* Interrupt dispatch */
1298 /* =========================================== */
1299
1300 static void process_etds(struct usb_hcd *hcd, struct imx21 *imx21, int sof)
1301 {
1302 int etd_num;
1303 int enable_sof_int = 0;
1304 unsigned long flags;
1305
1306 spin_lock_irqsave(&imx21->lock, flags);
1307
1308 for (etd_num = 0; etd_num < USB_NUM_ETD; etd_num++) {
1309 u32 etd_mask = 1 << etd_num;
1310 u32 enabled = readl(imx21->regs + USBH_ETDENSET) & etd_mask;
1311 u32 done = readl(imx21->regs + USBH_ETDDONESTAT) & etd_mask;
1312 struct etd_priv *etd = &imx21->etd[etd_num];
1313
1314
1315 if (done) {
1316 DEBUG_LOG_FRAME(imx21, etd, last_int);
1317 } else {
1318 /*
1319 * Kludge warning!
1320 *
1321 * When multiple transfers are using the bus we sometimes get into a state
1322 * where the transfer has completed (the CC field of the ETD is != 0x0F),
1323 * the ETD has self disabled but the ETDDONESTAT flag is not set
1324 * (and hence no interrupt occurs).
1325 * This causes the transfer in question to hang.
1326 * The kludge below checks for this condition at each SOF and processes any
1327 * blocked ETDs (after an arbitrary 10 frame wait)
1328 *
1329 * With a single active transfer the usbtest test suite will run for days
1330 * without the kludge.
1331 * With other bus activity (eg mass storage) even just test1 will hang without
1332 * the kludge.
1333 */
1334 u32 dword0;
1335 int cc;
1336
1337 if (etd->active_count && !enabled) /* suspicious... */
1338 enable_sof_int = 1;
1339
1340 if (!sof || enabled || !etd->active_count)
1341 continue;
1342
1343 cc = etd_readl(imx21, etd_num, 2) >> DW2_COMPCODE;
1344 if (cc == TD_NOTACCESSED)
1345 continue;
1346
1347 if (++etd->active_count < 10)
1348 continue;
1349
1350 dword0 = etd_readl(imx21, etd_num, 0);
1351 dev_dbg(imx21->dev,
1352 "unblock ETD %d dev=0x%X ep=0x%X cc=0x%02X!\n",
1353 etd_num, dword0 & 0x7F,
1354 (dword0 >> DW0_ENDPNT) & 0x0F,
1355 cc);
1356
1357 #ifdef DEBUG
1358 dev_dbg(imx21->dev,
1359 "frame: act=%d disact=%d"
1360 " int=%d req=%d cur=%d\n",
1361 etd->activated_frame,
1362 etd->disactivated_frame,
1363 etd->last_int_frame,
1364 etd->last_req_frame,
1365 readl(imx21->regs + USBH_FRMNUB));
1366 imx21->debug_unblocks++;
1367 #endif
1368 etd->active_count = 0;
1369 /* End of kludge */
1370 }
1371
1372 if (etd->ep == NULL || etd->urb == NULL) {
1373 dev_dbg(imx21->dev,
1374 "Interrupt for unexpected etd %d"
1375 " ep=%p urb=%p\n",
1376 etd_num, etd->ep, etd->urb);
1377 disactivate_etd(imx21, etd_num);
1378 continue;
1379 }
1380
1381 if (usb_pipeisoc(etd->urb->pipe))
1382 isoc_etd_done(hcd, etd_num);
1383 else
1384 nonisoc_etd_done(hcd, etd_num);
1385 }
1386
1387 /* only enable SOF interrupt if it may be needed for the kludge */
1388 if (enable_sof_int)
1389 set_register_bits(imx21, USBH_SYSIEN, USBH_SYSIEN_SOFINT);
1390 else
1391 clear_register_bits(imx21, USBH_SYSIEN, USBH_SYSIEN_SOFINT);
1392
1393
1394 spin_unlock_irqrestore(&imx21->lock, flags);
1395 }
1396
1397 static irqreturn_t imx21_irq(struct usb_hcd *hcd)
1398 {
1399 struct imx21 *imx21 = hcd_to_imx21(hcd);
1400 u32 ints = readl(imx21->regs + USBH_SYSISR);
1401
1402 if (ints & USBH_SYSIEN_HERRINT)
1403 dev_dbg(imx21->dev, "Scheduling error\n");
1404
1405 if (ints & USBH_SYSIEN_SORINT)
1406 dev_dbg(imx21->dev, "Scheduling overrun\n");
1407
1408 if (ints & (USBH_SYSISR_DONEINT | USBH_SYSISR_SOFINT))
1409 process_etds(hcd, imx21, ints & USBH_SYSISR_SOFINT);
1410
1411 writel(ints, imx21->regs + USBH_SYSISR);
1412 return IRQ_HANDLED;
1413 }
1414
1415 static void imx21_hc_endpoint_disable(struct usb_hcd *hcd,
1416 struct usb_host_endpoint *ep)
1417 {
1418 struct imx21 *imx21 = hcd_to_imx21(hcd);
1419 unsigned long flags;
1420 struct ep_priv *ep_priv;
1421 int i;
1422
1423 if (ep == NULL)
1424 return;
1425
1426 spin_lock_irqsave(&imx21->lock, flags);
1427 ep_priv = ep->hcpriv;
1428 dev_vdbg(imx21->dev, "disable ep=%p, ep->hcpriv=%p\n", ep, ep_priv);
1429
1430 if (!list_empty(&ep->urb_list))
1431 dev_dbg(imx21->dev, "ep's URB list is not empty\n");
1432
1433 if (ep_priv != NULL) {
1434 for (i = 0; i < NUM_ISO_ETDS; i++) {
1435 if (ep_priv->etd[i] > -1)
1436 dev_dbg(imx21->dev, "free etd %d for disable\n",
1437 ep_priv->etd[i]);
1438
1439 free_etd(imx21, ep_priv->etd[i]);
1440 }
1441 kfree(ep_priv);
1442 ep->hcpriv = NULL;
1443 }
1444
1445 for (i = 0; i < USB_NUM_ETD; i++) {
1446 if (imx21->etd[i].alloc && imx21->etd[i].ep == ep) {
1447 dev_err(imx21->dev,
1448 "Active etd %d for disabled ep=%p!\n", i, ep);
1449 free_etd(imx21, i);
1450 }
1451 }
1452 free_epdmem(imx21, ep);
1453 spin_unlock_irqrestore(&imx21->lock, flags);
1454 }
1455
1456 /* =========================================== */
1457 /* Hub handling */
1458 /* =========================================== */
1459
1460 static int get_hub_descriptor(struct usb_hcd *hcd,
1461 struct usb_hub_descriptor *desc)
1462 {
1463 struct imx21 *imx21 = hcd_to_imx21(hcd);
1464 desc->bDescriptorType = 0x29; /* HUB descriptor */
1465 desc->bHubContrCurrent = 0;
1466
1467 desc->bNbrPorts = readl(imx21->regs + USBH_ROOTHUBA)
1468 & USBH_ROOTHUBA_NDNSTMPRT_MASK;
1469 desc->bDescLength = 9;
1470 desc->bPwrOn2PwrGood = 0;
1471 desc->wHubCharacteristics = (__force __u16) cpu_to_le16(
1472 0x0002 | /* No power switching */
1473 0x0010 | /* No over current protection */
1474 0);
1475
1476 desc->u.hs.DeviceRemovable[0] = 1 << 1;
1477 desc->u.hs.DeviceRemovable[1] = ~0;
1478 return 0;
1479 }
1480
1481 static int imx21_hc_hub_status_data(struct usb_hcd *hcd, char *buf)
1482 {
1483 struct imx21 *imx21 = hcd_to_imx21(hcd);
1484 int ports;
1485 int changed = 0;
1486 int i;
1487 unsigned long flags;
1488
1489 spin_lock_irqsave(&imx21->lock, flags);
1490 ports = readl(imx21->regs + USBH_ROOTHUBA)
1491 & USBH_ROOTHUBA_NDNSTMPRT_MASK;
1492 if (ports > 7) {
1493 ports = 7;
1494 dev_err(imx21->dev, "ports %d > 7\n", ports);
1495 }
1496 for (i = 0; i < ports; i++) {
1497 if (readl(imx21->regs + USBH_PORTSTAT(i)) &
1498 (USBH_PORTSTAT_CONNECTSC |
1499 USBH_PORTSTAT_PRTENBLSC |
1500 USBH_PORTSTAT_PRTSTATSC |
1501 USBH_PORTSTAT_OVRCURIC |
1502 USBH_PORTSTAT_PRTRSTSC)) {
1503
1504 changed = 1;
1505 buf[0] |= 1 << (i + 1);
1506 }
1507 }
1508 spin_unlock_irqrestore(&imx21->lock, flags);
1509
1510 if (changed)
1511 dev_info(imx21->dev, "Hub status changed\n");
1512 return changed;
1513 }
1514
1515 static int imx21_hc_hub_control(struct usb_hcd *hcd,
1516 u16 typeReq,
1517 u16 wValue, u16 wIndex, char *buf, u16 wLength)
1518 {
1519 struct imx21 *imx21 = hcd_to_imx21(hcd);
1520 int rc = 0;
1521 u32 status_write = 0;
1522
1523 switch (typeReq) {
1524 case ClearHubFeature:
1525 dev_dbg(imx21->dev, "ClearHubFeature\n");
1526 switch (wValue) {
1527 case C_HUB_OVER_CURRENT:
1528 dev_dbg(imx21->dev, " OVER_CURRENT\n");
1529 break;
1530 case C_HUB_LOCAL_POWER:
1531 dev_dbg(imx21->dev, " LOCAL_POWER\n");
1532 break;
1533 default:
1534 dev_dbg(imx21->dev, " unknown\n");
1535 rc = -EINVAL;
1536 break;
1537 }
1538 break;
1539
1540 case ClearPortFeature:
1541 dev_dbg(imx21->dev, "ClearPortFeature\n");
1542 switch (wValue) {
1543 case USB_PORT_FEAT_ENABLE:
1544 dev_dbg(imx21->dev, " ENABLE\n");
1545 status_write = USBH_PORTSTAT_CURCONST;
1546 break;
1547 case USB_PORT_FEAT_SUSPEND:
1548 dev_dbg(imx21->dev, " SUSPEND\n");
1549 status_write = USBH_PORTSTAT_PRTOVRCURI;
1550 break;
1551 case USB_PORT_FEAT_POWER:
1552 dev_dbg(imx21->dev, " POWER\n");
1553 status_write = USBH_PORTSTAT_LSDEVCON;
1554 break;
1555 case USB_PORT_FEAT_C_ENABLE:
1556 dev_dbg(imx21->dev, " C_ENABLE\n");
1557 status_write = USBH_PORTSTAT_PRTENBLSC;
1558 break;
1559 case USB_PORT_FEAT_C_SUSPEND:
1560 dev_dbg(imx21->dev, " C_SUSPEND\n");
1561 status_write = USBH_PORTSTAT_PRTSTATSC;
1562 break;
1563 case USB_PORT_FEAT_C_CONNECTION:
1564 dev_dbg(imx21->dev, " C_CONNECTION\n");
1565 status_write = USBH_PORTSTAT_CONNECTSC;
1566 break;
1567 case USB_PORT_FEAT_C_OVER_CURRENT:
1568 dev_dbg(imx21->dev, " C_OVER_CURRENT\n");
1569 status_write = USBH_PORTSTAT_OVRCURIC;
1570 break;
1571 case USB_PORT_FEAT_C_RESET:
1572 dev_dbg(imx21->dev, " C_RESET\n");
1573 status_write = USBH_PORTSTAT_PRTRSTSC;
1574 break;
1575 default:
1576 dev_dbg(imx21->dev, " unknown\n");
1577 rc = -EINVAL;
1578 break;
1579 }
1580
1581 break;
1582
1583 case GetHubDescriptor:
1584 dev_dbg(imx21->dev, "GetHubDescriptor\n");
1585 rc = get_hub_descriptor(hcd, (void *)buf);
1586 break;
1587
1588 case GetHubStatus:
1589 dev_dbg(imx21->dev, " GetHubStatus\n");
1590 *(__le32 *) buf = 0;
1591 break;
1592
1593 case GetPortStatus:
1594 dev_dbg(imx21->dev, "GetPortStatus: port: %d, 0x%x\n",
1595 wIndex, USBH_PORTSTAT(wIndex - 1));
1596 *(__le32 *) buf = readl(imx21->regs +
1597 USBH_PORTSTAT(wIndex - 1));
1598 break;
1599
1600 case SetHubFeature:
1601 dev_dbg(imx21->dev, "SetHubFeature\n");
1602 switch (wValue) {
1603 case C_HUB_OVER_CURRENT:
1604 dev_dbg(imx21->dev, " OVER_CURRENT\n");
1605 break;
1606
1607 case C_HUB_LOCAL_POWER:
1608 dev_dbg(imx21->dev, " LOCAL_POWER\n");
1609 break;
1610 default:
1611 dev_dbg(imx21->dev, " unknown\n");
1612 rc = -EINVAL;
1613 break;
1614 }
1615
1616 break;
1617
1618 case SetPortFeature:
1619 dev_dbg(imx21->dev, "SetPortFeature\n");
1620 switch (wValue) {
1621 case USB_PORT_FEAT_SUSPEND:
1622 dev_dbg(imx21->dev, " SUSPEND\n");
1623 status_write = USBH_PORTSTAT_PRTSUSPST;
1624 break;
1625 case USB_PORT_FEAT_POWER:
1626 dev_dbg(imx21->dev, " POWER\n");
1627 status_write = USBH_PORTSTAT_PRTPWRST;
1628 break;
1629 case USB_PORT_FEAT_RESET:
1630 dev_dbg(imx21->dev, " RESET\n");
1631 status_write = USBH_PORTSTAT_PRTRSTST;
1632 break;
1633 default:
1634 dev_dbg(imx21->dev, " unknown\n");
1635 rc = -EINVAL;
1636 break;
1637 }
1638 break;
1639
1640 default:
1641 dev_dbg(imx21->dev, " unknown\n");
1642 rc = -EINVAL;
1643 break;
1644 }
1645
1646 if (status_write)
1647 writel(status_write, imx21->regs + USBH_PORTSTAT(wIndex - 1));
1648 return rc;
1649 }
1650
1651 /* =========================================== */
1652 /* Host controller management */
1653 /* =========================================== */
1654
1655 static int imx21_hc_reset(struct usb_hcd *hcd)
1656 {
1657 struct imx21 *imx21 = hcd_to_imx21(hcd);
1658 unsigned long timeout;
1659 unsigned long flags;
1660
1661 spin_lock_irqsave(&imx21->lock, flags);
1662
1663 /* Reset the Host controller modules */
1664 writel(USBOTG_RST_RSTCTRL | USBOTG_RST_RSTRH |
1665 USBOTG_RST_RSTHSIE | USBOTG_RST_RSTHC,
1666 imx21->regs + USBOTG_RST_CTRL);
1667
1668 /* Wait for reset to finish */
1669 timeout = jiffies + HZ;
1670 while (readl(imx21->regs + USBOTG_RST_CTRL) != 0) {
1671 if (time_after(jiffies, timeout)) {
1672 spin_unlock_irqrestore(&imx21->lock, flags);
1673 dev_err(imx21->dev, "timeout waiting for reset\n");
1674 return -ETIMEDOUT;
1675 }
1676 spin_unlock_irq(&imx21->lock);
1677 schedule_timeout_uninterruptible(1);
1678 spin_lock_irq(&imx21->lock);
1679 }
1680 spin_unlock_irqrestore(&imx21->lock, flags);
1681 return 0;
1682 }
1683
1684 static int imx21_hc_start(struct usb_hcd *hcd)
1685 {
1686 struct imx21 *imx21 = hcd_to_imx21(hcd);
1687 unsigned long flags;
1688 int i, j;
1689 u32 hw_mode = USBOTG_HWMODE_CRECFG_HOST;
1690 u32 usb_control = 0;
1691
1692 hw_mode |= ((imx21->pdata->host_xcvr << USBOTG_HWMODE_HOSTXCVR_SHIFT) &
1693 USBOTG_HWMODE_HOSTXCVR_MASK);
1694 hw_mode |= ((imx21->pdata->otg_xcvr << USBOTG_HWMODE_OTGXCVR_SHIFT) &
1695 USBOTG_HWMODE_OTGXCVR_MASK);
1696
1697 if (imx21->pdata->host1_txenoe)
1698 usb_control |= USBCTRL_HOST1_TXEN_OE;
1699
1700 if (!imx21->pdata->host1_xcverless)
1701 usb_control |= USBCTRL_HOST1_BYP_TLL;
1702
1703 if (imx21->pdata->otg_ext_xcvr)
1704 usb_control |= USBCTRL_OTC_RCV_RXDP;
1705
1706
1707 spin_lock_irqsave(&imx21->lock, flags);
1708
1709 writel((USBOTG_CLK_CTRL_HST | USBOTG_CLK_CTRL_MAIN),
1710 imx21->regs + USBOTG_CLK_CTRL);
1711 writel(hw_mode, imx21->regs + USBOTG_HWMODE);
1712 writel(usb_control, imx21->regs + USBCTRL);
1713 writel(USB_MISCCONTROL_SKPRTRY | USB_MISCCONTROL_ARBMODE,
1714 imx21->regs + USB_MISCCONTROL);
1715
1716 /* Clear the ETDs */
1717 for (i = 0; i < USB_NUM_ETD; i++)
1718 for (j = 0; j < 4; j++)
1719 etd_writel(imx21, i, j, 0);
1720
1721 /* Take the HC out of reset */
1722 writel(USBH_HOST_CTRL_HCUSBSTE_OPERATIONAL | USBH_HOST_CTRL_CTLBLKSR_1,
1723 imx21->regs + USBH_HOST_CTRL);
1724
1725 /* Enable ports */
1726 if (imx21->pdata->enable_otg_host)
1727 writel(USBH_PORTSTAT_PRTPWRST | USBH_PORTSTAT_PRTENABST,
1728 imx21->regs + USBH_PORTSTAT(0));
1729
1730 if (imx21->pdata->enable_host1)
1731 writel(USBH_PORTSTAT_PRTPWRST | USBH_PORTSTAT_PRTENABST,
1732 imx21->regs + USBH_PORTSTAT(1));
1733
1734 if (imx21->pdata->enable_host2)
1735 writel(USBH_PORTSTAT_PRTPWRST | USBH_PORTSTAT_PRTENABST,
1736 imx21->regs + USBH_PORTSTAT(2));
1737
1738
1739 hcd->state = HC_STATE_RUNNING;
1740
1741 /* Enable host controller interrupts */
1742 set_register_bits(imx21, USBH_SYSIEN,
1743 USBH_SYSIEN_HERRINT |
1744 USBH_SYSIEN_DONEINT | USBH_SYSIEN_SORINT);
1745 set_register_bits(imx21, USBOTG_CINT_STEN, USBOTG_HCINT);
1746
1747 spin_unlock_irqrestore(&imx21->lock, flags);
1748
1749 return 0;
1750 }
1751
1752 static void imx21_hc_stop(struct usb_hcd *hcd)
1753 {
1754 struct imx21 *imx21 = hcd_to_imx21(hcd);
1755 unsigned long flags;
1756
1757 spin_lock_irqsave(&imx21->lock, flags);
1758
1759 writel(0, imx21->regs + USBH_SYSIEN);
1760 clear_register_bits(imx21, USBOTG_CINT_STEN, USBOTG_HCINT);
1761 clear_register_bits(imx21, USBOTG_CLK_CTRL_HST | USBOTG_CLK_CTRL_MAIN,
1762 USBOTG_CLK_CTRL);
1763 spin_unlock_irqrestore(&imx21->lock, flags);
1764 }
1765
1766 /* =========================================== */
1767 /* Driver glue */
1768 /* =========================================== */
1769
1770 static struct hc_driver imx21_hc_driver = {
1771 .description = hcd_name,
1772 .product_desc = "IMX21 USB Host Controller",
1773 .hcd_priv_size = sizeof(struct imx21),
1774
1775 .flags = HCD_USB11,
1776 .irq = imx21_irq,
1777
1778 .reset = imx21_hc_reset,
1779 .start = imx21_hc_start,
1780 .stop = imx21_hc_stop,
1781
1782 /* I/O requests */
1783 .urb_enqueue = imx21_hc_urb_enqueue,
1784 .urb_dequeue = imx21_hc_urb_dequeue,
1785 .endpoint_disable = imx21_hc_endpoint_disable,
1786
1787 /* scheduling support */
1788 .get_frame_number = imx21_hc_get_frame,
1789
1790 /* Root hub support */
1791 .hub_status_data = imx21_hc_hub_status_data,
1792 .hub_control = imx21_hc_hub_control,
1793
1794 };
1795
1796 static struct mx21_usbh_platform_data default_pdata = {
1797 .host_xcvr = MX21_USBXCVR_TXDIF_RXDIF,
1798 .otg_xcvr = MX21_USBXCVR_TXDIF_RXDIF,
1799 .enable_host1 = 1,
1800 .enable_host2 = 1,
1801 .enable_otg_host = 1,
1802
1803 };
1804
1805 static int imx21_remove(struct platform_device *pdev)
1806 {
1807 struct usb_hcd *hcd = platform_get_drvdata(pdev);
1808 struct imx21 *imx21 = hcd_to_imx21(hcd);
1809 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1810
1811 remove_debug_files(imx21);
1812 usb_remove_hcd(hcd);
1813
1814 if (res != NULL) {
1815 clk_disable_unprepare(imx21->clk);
1816 clk_put(imx21->clk);
1817 iounmap(imx21->regs);
1818 release_mem_region(res->start, resource_size(res));
1819 }
1820
1821 kfree(hcd);
1822 return 0;
1823 }
1824
1825
1826 static int imx21_probe(struct platform_device *pdev)
1827 {
1828 struct usb_hcd *hcd;
1829 struct imx21 *imx21;
1830 struct resource *res;
1831 int ret;
1832 int irq;
1833
1834 printk(KERN_INFO "%s\n", imx21_hc_driver.product_desc);
1835
1836 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1837 if (!res)
1838 return -ENODEV;
1839 irq = platform_get_irq(pdev, 0);
1840 if (irq < 0)
1841 return -ENXIO;
1842
1843 hcd = usb_create_hcd(&imx21_hc_driver,
1844 &pdev->dev, dev_name(&pdev->dev));
1845 if (hcd == NULL) {
1846 dev_err(&pdev->dev, "Cannot create hcd (%s)\n",
1847 dev_name(&pdev->dev));
1848 return -ENOMEM;
1849 }
1850
1851 imx21 = hcd_to_imx21(hcd);
1852 imx21->hcd = hcd;
1853 imx21->dev = &pdev->dev;
1854 imx21->pdata = pdev->dev.platform_data;
1855 if (!imx21->pdata)
1856 imx21->pdata = &default_pdata;
1857
1858 spin_lock_init(&imx21->lock);
1859 INIT_LIST_HEAD(&imx21->dmem_list);
1860 INIT_LIST_HEAD(&imx21->queue_for_etd);
1861 INIT_LIST_HEAD(&imx21->queue_for_dmem);
1862 create_debug_files(imx21);
1863
1864 res = request_mem_region(res->start, resource_size(res), hcd_name);
1865 if (!res) {
1866 ret = -EBUSY;
1867 goto failed_request_mem;
1868 }
1869
1870 imx21->regs = ioremap(res->start, resource_size(res));
1871 if (imx21->regs == NULL) {
1872 dev_err(imx21->dev, "Cannot map registers\n");
1873 ret = -ENOMEM;
1874 goto failed_ioremap;
1875 }
1876
1877 /* Enable clocks source */
1878 imx21->clk = clk_get(imx21->dev, NULL);
1879 if (IS_ERR(imx21->clk)) {
1880 dev_err(imx21->dev, "no clock found\n");
1881 ret = PTR_ERR(imx21->clk);
1882 goto failed_clock_get;
1883 }
1884
1885 ret = clk_set_rate(imx21->clk, clk_round_rate(imx21->clk, 48000000));
1886 if (ret)
1887 goto failed_clock_set;
1888 ret = clk_prepare_enable(imx21->clk);
1889 if (ret)
1890 goto failed_clock_enable;
1891
1892 dev_info(imx21->dev, "Hardware HC revision: 0x%02X\n",
1893 (readl(imx21->regs + USBOTG_HWMODE) >> 16) & 0xFF);
1894
1895 ret = usb_add_hcd(hcd, irq, 0);
1896 if (ret != 0) {
1897 dev_err(imx21->dev, "usb_add_hcd() returned %d\n", ret);
1898 goto failed_add_hcd;
1899 }
1900
1901 return 0;
1902
1903 failed_add_hcd:
1904 clk_disable_unprepare(imx21->clk);
1905 failed_clock_enable:
1906 failed_clock_set:
1907 clk_put(imx21->clk);
1908 failed_clock_get:
1909 iounmap(imx21->regs);
1910 failed_ioremap:
1911 release_mem_region(res->start, resource_size(res));
1912 failed_request_mem:
1913 remove_debug_files(imx21);
1914 usb_put_hcd(hcd);
1915 return ret;
1916 }
1917
1918 static struct platform_driver imx21_hcd_driver = {
1919 .driver = {
1920 .name = (char *)hcd_name,
1921 },
1922 .probe = imx21_probe,
1923 .remove = imx21_remove,
1924 .suspend = NULL,
1925 .resume = NULL,
1926 };
1927
1928 module_platform_driver(imx21_hcd_driver);
1929
1930 MODULE_DESCRIPTION("i.MX21 USB Host controller");
1931 MODULE_AUTHOR("Martin Fuzzey");
1932 MODULE_LICENSE("GPL");
1933 MODULE_ALIAS("platform:imx21-hcd");
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