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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / host / imx21-hcd.c
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
62 #include "imx21-hcd.h"
63
64 #ifdef DEBUG
65 #define DEBUG_LOG_FRAME(imx21, etd, event) \
66 (etd)->event##_frame = readl((imx21)->regs + USBH_FRMNUB)
67 #else
68 #define DEBUG_LOG_FRAME(imx21, etd, event) do { } while (0)
69 #endif
70
71 static const char hcd_name[] = "imx21-hcd";
72
73 static inline struct imx21 *hcd_to_imx21(struct usb_hcd *hcd)
74 {
75 return (struct imx21 *)hcd->hcd_priv;
76 }
77
78
79 /* =========================================== */
80 /* Hardware access helpers */
81 /* =========================================== */
82
83 static inline void set_register_bits(struct imx21 *imx21, u32 offset, u32 mask)
84 {
85 void __iomem *reg = imx21->regs + offset;
86 writel(readl(reg) | mask, reg);
87 }
88
89 static inline void clear_register_bits(struct imx21 *imx21,
90 u32 offset, u32 mask)
91 {
92 void __iomem *reg = imx21->regs + offset;
93 writel(readl(reg) & ~mask, reg);
94 }
95
96 static inline void clear_toggle_bit(struct imx21 *imx21, u32 offset, u32 mask)
97 {
98 void __iomem *reg = imx21->regs + offset;
99
100 if (readl(reg) & mask)
101 writel(mask, reg);
102 }
103
104 static inline void set_toggle_bit(struct imx21 *imx21, u32 offset, u32 mask)
105 {
106 void __iomem *reg = imx21->regs + offset;
107
108 if (!(readl(reg) & mask))
109 writel(mask, reg);
110 }
111
112 static void etd_writel(struct imx21 *imx21, int etd_num, int dword, u32 value)
113 {
114 writel(value, imx21->regs + USB_ETD_DWORD(etd_num, dword));
115 }
116
117 static u32 etd_readl(struct imx21 *imx21, int etd_num, int dword)
118 {
119 return readl(imx21->regs + USB_ETD_DWORD(etd_num, dword));
120 }
121
122 static inline int wrap_frame(int counter)
123 {
124 return counter & 0xFFFF;
125 }
126
127 static inline int frame_after(int frame, int after)
128 {
129 /* handle wrapping like jiffies time_afer */
130 return (s16)((s16)after - (s16)frame) < 0;
131 }
132
133 static int imx21_hc_get_frame(struct usb_hcd *hcd)
134 {
135 struct imx21 *imx21 = hcd_to_imx21(hcd);
136
137 return wrap_frame(readl(imx21->regs + USBH_FRMNUB));
138 }
139
140 static inline bool unsuitable_for_dma(dma_addr_t addr)
141 {
142 return (addr & 3) != 0;
143 }
144
145 #include "imx21-dbg.c"
146
147 static void nonisoc_urb_completed_for_etd(
148 struct imx21 *imx21, struct etd_priv *etd, int status);
149 static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb);
150 static void free_dmem(struct imx21 *imx21, struct etd_priv *etd);
151
152 /* =========================================== */
153 /* ETD management */
154 /* =========================================== */
155
156 static int alloc_etd(struct imx21 *imx21)
157 {
158 int i;
159 struct etd_priv *etd = imx21->etd;
160
161 for (i = 0; i < USB_NUM_ETD; i++, etd++) {
162 if (etd->alloc == 0) {
163 memset(etd, 0, sizeof(imx21->etd[0]));
164 etd->alloc = 1;
165 debug_etd_allocated(imx21);
166 return i;
167 }
168 }
169 return -1;
170 }
171
172 static void disactivate_etd(struct imx21 *imx21, int num)
173 {
174 int etd_mask = (1 << num);
175 struct etd_priv *etd = &imx21->etd[num];
176
177 writel(etd_mask, imx21->regs + USBH_ETDENCLR);
178 clear_register_bits(imx21, USBH_ETDDONEEN, etd_mask);
179 writel(etd_mask, imx21->regs + USB_ETDDMACHANLCLR);
180 clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask);
181
182 etd->active_count = 0;
183
184 DEBUG_LOG_FRAME(imx21, etd, disactivated);
185 }
186
187 static void reset_etd(struct imx21 *imx21, int num)
188 {
189 struct etd_priv *etd = imx21->etd + num;
190 int i;
191
192 disactivate_etd(imx21, num);
193
194 for (i = 0; i < 4; i++)
195 etd_writel(imx21, num, i, 0);
196 etd->urb = NULL;
197 etd->ep = NULL;
198 etd->td = NULL;
199 etd->bounce_buffer = NULL;
200 }
201
202 static void free_etd(struct imx21 *imx21, int num)
203 {
204 if (num < 0)
205 return;
206
207 if (num >= USB_NUM_ETD) {
208 dev_err(imx21->dev, "BAD etd=%d!\n", num);
209 return;
210 }
211 if (imx21->etd[num].alloc == 0) {
212 dev_err(imx21->dev, "ETD %d already free!\n", num);
213 return;
214 }
215
216 debug_etd_freed(imx21);
217 reset_etd(imx21, num);
218 memset(&imx21->etd[num], 0, sizeof(imx21->etd[0]));
219 }
220
221
222 static void setup_etd_dword0(struct imx21 *imx21,
223 int etd_num, struct urb *urb, u8 dir, u16 maxpacket)
224 {
225 etd_writel(imx21, etd_num, 0,
226 ((u32) usb_pipedevice(urb->pipe)) << DW0_ADDRESS |
227 ((u32) usb_pipeendpoint(urb->pipe) << DW0_ENDPNT) |
228 ((u32) dir << DW0_DIRECT) |
229 ((u32) ((urb->dev->speed == USB_SPEED_LOW) ?
230 1 : 0) << DW0_SPEED) |
231 ((u32) fmt_urb_to_etd[usb_pipetype(urb->pipe)] << DW0_FORMAT) |
232 ((u32) maxpacket << DW0_MAXPKTSIZ));
233 }
234
235 /**
236 * Copy buffer to data controller data memory.
237 * We cannot use memcpy_toio() because the hardware requires 32bit writes
238 */
239 static void copy_to_dmem(
240 struct imx21 *imx21, int dmem_offset, void *src, int count)
241 {
242 void __iomem *dmem = imx21->regs + USBOTG_DMEM + dmem_offset;
243 u32 word = 0;
244 u8 *p = src;
245 int byte = 0;
246 int i;
247
248 for (i = 0; i < count; i++) {
249 byte = i % 4;
250 word += (*p++ << (byte * 8));
251 if (byte == 3) {
252 writel(word, dmem);
253 dmem += 4;
254 word = 0;
255 }
256 }
257
258 if (count && byte != 3)
259 writel(word, dmem);
260 }
261
262 static void activate_etd(struct imx21 *imx21, int etd_num, u8 dir)
263 {
264 u32 etd_mask = 1 << etd_num;
265 struct etd_priv *etd = &imx21->etd[etd_num];
266
267 if (etd->dma_handle && unsuitable_for_dma(etd->dma_handle)) {
268 /* For non aligned isoc the condition below is always true */
269 if (etd->len <= etd->dmem_size) {
270 /* Fits into data memory, use PIO */
271 if (dir != TD_DIR_IN) {
272 copy_to_dmem(imx21,
273 etd->dmem_offset,
274 etd->cpu_buffer, etd->len);
275 }
276 etd->dma_handle = 0;
277
278 } else {
279 /* Too big for data memory, use bounce buffer */
280 enum dma_data_direction dmadir;
281
282 if (dir == TD_DIR_IN) {
283 dmadir = DMA_FROM_DEVICE;
284 etd->bounce_buffer = kmalloc(etd->len,
285 GFP_ATOMIC);
286 } else {
287 dmadir = DMA_TO_DEVICE;
288 etd->bounce_buffer = kmemdup(etd->cpu_buffer,
289 etd->len,
290 GFP_ATOMIC);
291 }
292 if (!etd->bounce_buffer) {
293 dev_err(imx21->dev, "failed bounce alloc\n");
294 goto err_bounce_alloc;
295 }
296
297 etd->dma_handle =
298 dma_map_single(imx21->dev,
299 etd->bounce_buffer,
300 etd->len,
301 dmadir);
302 if (dma_mapping_error(imx21->dev, etd->dma_handle)) {
303 dev_err(imx21->dev, "failed bounce map\n");
304 goto err_bounce_map;
305 }
306 }
307 }
308
309 clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask);
310 set_register_bits(imx21, USBH_ETDDONEEN, etd_mask);
311 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
312 clear_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
313
314 if (etd->dma_handle) {
315 set_register_bits(imx21, USB_ETDDMACHANLCLR, etd_mask);
316 clear_toggle_bit(imx21, USBH_XBUFSTAT, etd_mask);
317 clear_toggle_bit(imx21, USBH_YBUFSTAT, etd_mask);
318 writel(etd->dma_handle, imx21->regs + USB_ETDSMSA(etd_num));
319 set_register_bits(imx21, USB_ETDDMAEN, etd_mask);
320 } else {
321 if (dir != TD_DIR_IN) {
322 /* need to set for ZLP and PIO */
323 set_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
324 set_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
325 }
326 }
327
328 DEBUG_LOG_FRAME(imx21, etd, activated);
329
330 #ifdef DEBUG
331 if (!etd->active_count) {
332 int i;
333 etd->activated_frame = readl(imx21->regs + USBH_FRMNUB);
334 etd->disactivated_frame = -1;
335 etd->last_int_frame = -1;
336 etd->last_req_frame = -1;
337
338 for (i = 0; i < 4; i++)
339 etd->submitted_dwords[i] = etd_readl(imx21, etd_num, i);
340 }
341 #endif
342
343 etd->active_count = 1;
344 writel(etd_mask, imx21->regs + USBH_ETDENSET);
345 return;
346
347 err_bounce_map:
348 kfree(etd->bounce_buffer);
349
350 err_bounce_alloc:
351 free_dmem(imx21, etd);
352 nonisoc_urb_completed_for_etd(imx21, etd, -ENOMEM);
353 }
354
355 /* =========================================== */
356 /* Data memory management */
357 /* =========================================== */
358
359 static int alloc_dmem(struct imx21 *imx21, unsigned int size,
360 struct usb_host_endpoint *ep)
361 {
362 unsigned int offset = 0;
363 struct imx21_dmem_area *area;
364 struct imx21_dmem_area *tmp;
365
366 size += (~size + 1) & 0x3; /* Round to 4 byte multiple */
367
368 if (size > DMEM_SIZE) {
369 dev_err(imx21->dev, "size=%d > DMEM_SIZE(%d)\n",
370 size, DMEM_SIZE);
371 return -EINVAL;
372 }
373
374 list_for_each_entry(tmp, &imx21->dmem_list, list) {
375 if ((size + offset) < offset)
376 goto fail;
377 if ((size + offset) <= tmp->offset)
378 break;
379 offset = tmp->size + tmp->offset;
380 if ((offset + size) > DMEM_SIZE)
381 goto fail;
382 }
383
384 area = kmalloc(sizeof(struct imx21_dmem_area), GFP_ATOMIC);
385 if (area == NULL)
386 return -ENOMEM;
387
388 area->ep = ep;
389 area->offset = offset;
390 area->size = size;
391 list_add_tail(&area->list, &tmp->list);
392 debug_dmem_allocated(imx21, size);
393 return offset;
394
395 fail:
396 return -ENOMEM;
397 }
398
399 /* Memory now available for a queued ETD - activate it */
400 static void activate_queued_etd(struct imx21 *imx21,
401 struct etd_priv *etd, u32 dmem_offset)
402 {
403 struct urb_priv *urb_priv = etd->urb->hcpriv;
404 int etd_num = etd - &imx21->etd[0];
405 u32 maxpacket = etd_readl(imx21, etd_num, 1) >> DW1_YBUFSRTAD;
406 u8 dir = (etd_readl(imx21, etd_num, 2) >> DW2_DIRPID) & 0x03;
407
408 dev_dbg(imx21->dev, "activating queued ETD %d now DMEM available\n",
409 etd_num);
410 etd_writel(imx21, etd_num, 1,
411 ((dmem_offset + maxpacket) << DW1_YBUFSRTAD) | dmem_offset);
412
413 etd->dmem_offset = dmem_offset;
414 urb_priv->active = 1;
415 activate_etd(imx21, etd_num, dir);
416 }
417
418 static void free_dmem(struct imx21 *imx21, struct etd_priv *etd)
419 {
420 struct imx21_dmem_area *area;
421 struct etd_priv *tmp;
422 int found = 0;
423 int offset;
424
425 if (!etd->dmem_size)
426 return;
427 etd->dmem_size = 0;
428
429 offset = etd->dmem_offset;
430 list_for_each_entry(area, &imx21->dmem_list, list) {
431 if (area->offset == offset) {
432 debug_dmem_freed(imx21, area->size);
433 list_del(&area->list);
434 kfree(area);
435 found = 1;
436 break;
437 }
438 }
439
440 if (!found) {
441 dev_err(imx21->dev,
442 "Trying to free unallocated DMEM %d\n", offset);
443 return;
444 }
445
446 /* Try again to allocate memory for anything we've queued */
447 list_for_each_entry_safe(etd, tmp, &imx21->queue_for_dmem, queue) {
448 offset = alloc_dmem(imx21, etd->dmem_size, etd->ep);
449 if (offset >= 0) {
450 list_del(&etd->queue);
451 activate_queued_etd(imx21, etd, (u32)offset);
452 }
453 }
454 }
455
456 static void free_epdmem(struct imx21 *imx21, struct usb_host_endpoint *ep)
457 {
458 struct imx21_dmem_area *area, *tmp;
459
460 list_for_each_entry_safe(area, tmp, &imx21->dmem_list, list) {
461 if (area->ep == ep) {
462 dev_err(imx21->dev,
463 "Active DMEM %d for disabled ep=%p\n",
464 area->offset, ep);
465 list_del(&area->list);
466 kfree(area);
467 }
468 }
469 }
470
471
472 /* =========================================== */
473 /* End handling */
474 /* =========================================== */
475
476 /* Endpoint now idle - release it's ETD(s) or asssign to queued request */
477 static void ep_idle(struct imx21 *imx21, struct ep_priv *ep_priv)
478 {
479 int i;
480
481 for (i = 0; i < NUM_ISO_ETDS; i++) {
482 int etd_num = ep_priv->etd[i];
483 struct etd_priv *etd;
484 if (etd_num < 0)
485 continue;
486
487 etd = &imx21->etd[etd_num];
488 ep_priv->etd[i] = -1;
489
490 free_dmem(imx21, etd); /* for isoc */
491
492 if (list_empty(&imx21->queue_for_etd)) {
493 free_etd(imx21, etd_num);
494 continue;
495 }
496
497 dev_dbg(imx21->dev,
498 "assigning idle etd %d for queued request\n", etd_num);
499 ep_priv = list_first_entry(&imx21->queue_for_etd,
500 struct ep_priv, queue);
501 list_del(&ep_priv->queue);
502 reset_etd(imx21, etd_num);
503 ep_priv->waiting_etd = 0;
504 ep_priv->etd[i] = etd_num;
505
506 if (list_empty(&ep_priv->ep->urb_list)) {
507 dev_err(imx21->dev, "No urb for queued ep!\n");
508 continue;
509 }
510 schedule_nonisoc_etd(imx21, list_first_entry(
511 &ep_priv->ep->urb_list, struct urb, urb_list));
512 }
513 }
514
515 static void urb_done(struct usb_hcd *hcd, struct urb *urb, int status)
516 __releases(imx21->lock)
517 __acquires(imx21->lock)
518 {
519 struct imx21 *imx21 = hcd_to_imx21(hcd);
520 struct ep_priv *ep_priv = urb->ep->hcpriv;
521 struct urb_priv *urb_priv = urb->hcpriv;
522
523 debug_urb_completed(imx21, urb, status);
524 dev_vdbg(imx21->dev, "urb %p done %d\n", urb, status);
525
526 kfree(urb_priv->isoc_td);
527 kfree(urb->hcpriv);
528 urb->hcpriv = NULL;
529 usb_hcd_unlink_urb_from_ep(hcd, urb);
530 spin_unlock(&imx21->lock);
531 usb_hcd_giveback_urb(hcd, urb, status);
532 spin_lock(&imx21->lock);
533 if (list_empty(&ep_priv->ep->urb_list))
534 ep_idle(imx21, ep_priv);
535 }
536
537 static void nonisoc_urb_completed_for_etd(
538 struct imx21 *imx21, struct etd_priv *etd, int status)
539 {
540 struct usb_host_endpoint *ep = etd->ep;
541
542 urb_done(imx21->hcd, etd->urb, status);
543 etd->urb = NULL;
544
545 if (!list_empty(&ep->urb_list)) {
546 struct urb *urb = list_first_entry(
547 &ep->urb_list, struct urb, urb_list);
548
549 dev_vdbg(imx21->dev, "next URB %p\n", urb);
550 schedule_nonisoc_etd(imx21, urb);
551 }
552 }
553
554
555 /* =========================================== */
556 /* ISOC Handling ... */
557 /* =========================================== */
558
559 static void schedule_isoc_etds(struct usb_hcd *hcd,
560 struct usb_host_endpoint *ep)
561 {
562 struct imx21 *imx21 = hcd_to_imx21(hcd);
563 struct ep_priv *ep_priv = ep->hcpriv;
564 struct etd_priv *etd;
565 struct urb_priv *urb_priv;
566 struct td *td;
567 int etd_num;
568 int i;
569 int cur_frame;
570 u8 dir;
571
572 for (i = 0; i < NUM_ISO_ETDS; i++) {
573 too_late:
574 if (list_empty(&ep_priv->td_list))
575 break;
576
577 etd_num = ep_priv->etd[i];
578 if (etd_num < 0)
579 break;
580
581 etd = &imx21->etd[etd_num];
582 if (etd->urb)
583 continue;
584
585 td = list_entry(ep_priv->td_list.next, struct td, list);
586 list_del(&td->list);
587 urb_priv = td->urb->hcpriv;
588
589 cur_frame = imx21_hc_get_frame(hcd);
590 if (frame_after(cur_frame, td->frame)) {
591 dev_dbg(imx21->dev, "isoc too late frame %d > %d\n",
592 cur_frame, td->frame);
593 urb_priv->isoc_status = -EXDEV;
594 td->urb->iso_frame_desc[
595 td->isoc_index].actual_length = 0;
596 td->urb->iso_frame_desc[td->isoc_index].status = -EXDEV;
597 if (--urb_priv->isoc_remaining == 0)
598 urb_done(hcd, td->urb, urb_priv->isoc_status);
599 goto too_late;
600 }
601
602 urb_priv->active = 1;
603 etd->td = td;
604 etd->ep = td->ep;
605 etd->urb = td->urb;
606 etd->len = td->len;
607 etd->dma_handle = td->dma_handle;
608 etd->cpu_buffer = td->cpu_buffer;
609
610 debug_isoc_submitted(imx21, cur_frame, td);
611
612 dir = usb_pipeout(td->urb->pipe) ? TD_DIR_OUT : TD_DIR_IN;
613 setup_etd_dword0(imx21, etd_num, td->urb, dir, etd->dmem_size);
614 etd_writel(imx21, etd_num, 1, etd->dmem_offset);
615 etd_writel(imx21, etd_num, 2,
616 (TD_NOTACCESSED << DW2_COMPCODE) |
617 ((td->frame & 0xFFFF) << DW2_STARTFRM));
618 etd_writel(imx21, etd_num, 3,
619 (TD_NOTACCESSED << DW3_COMPCODE0) |
620 (td->len << DW3_PKTLEN0));
621
622 activate_etd(imx21, etd_num, dir);
623 }
624 }
625
626 static void isoc_etd_done(struct usb_hcd *hcd, int etd_num)
627 {
628 struct imx21 *imx21 = hcd_to_imx21(hcd);
629 int etd_mask = 1 << etd_num;
630 struct etd_priv *etd = imx21->etd + etd_num;
631 struct urb *urb = etd->urb;
632 struct urb_priv *urb_priv = urb->hcpriv;
633 struct td *td = etd->td;
634 struct usb_host_endpoint *ep = etd->ep;
635 int isoc_index = td->isoc_index;
636 unsigned int pipe = urb->pipe;
637 int dir_in = usb_pipein(pipe);
638 int cc;
639 int bytes_xfrd;
640
641 disactivate_etd(imx21, etd_num);
642
643 cc = (etd_readl(imx21, etd_num, 3) >> DW3_COMPCODE0) & 0xf;
644 bytes_xfrd = etd_readl(imx21, etd_num, 3) & 0x3ff;
645
646 /* Input doesn't always fill the buffer, don't generate an error
647 * when this happens.
648 */
649 if (dir_in && (cc == TD_DATAUNDERRUN))
650 cc = TD_CC_NOERROR;
651
652 if (cc == TD_NOTACCESSED)
653 bytes_xfrd = 0;
654
655 debug_isoc_completed(imx21,
656 imx21_hc_get_frame(hcd), td, cc, bytes_xfrd);
657 if (cc) {
658 urb_priv->isoc_status = -EXDEV;
659 dev_dbg(imx21->dev,
660 "bad iso cc=0x%X frame=%d sched frame=%d "
661 "cnt=%d len=%d urb=%p etd=%d index=%d\n",
662 cc, imx21_hc_get_frame(hcd), td->frame,
663 bytes_xfrd, td->len, urb, etd_num, isoc_index);
664 }
665
666 if (dir_in) {
667 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
668 if (!etd->dma_handle)
669 memcpy_fromio(etd->cpu_buffer,
670 imx21->regs + USBOTG_DMEM + etd->dmem_offset,
671 bytes_xfrd);
672 }
673
674 urb->actual_length += bytes_xfrd;
675 urb->iso_frame_desc[isoc_index].actual_length = bytes_xfrd;
676 urb->iso_frame_desc[isoc_index].status = cc_to_error[cc];
677
678 etd->td = NULL;
679 etd->urb = NULL;
680 etd->ep = NULL;
681
682 if (--urb_priv->isoc_remaining == 0)
683 urb_done(hcd, urb, urb_priv->isoc_status);
684
685 schedule_isoc_etds(hcd, ep);
686 }
687
688 static struct ep_priv *alloc_isoc_ep(
689 struct imx21 *imx21, struct usb_host_endpoint *ep)
690 {
691 struct ep_priv *ep_priv;
692 int i;
693
694 ep_priv = kzalloc(sizeof(struct ep_priv), GFP_ATOMIC);
695 if (!ep_priv)
696 return NULL;
697
698 for (i = 0; i < NUM_ISO_ETDS; i++)
699 ep_priv->etd[i] = -1;
700
701 INIT_LIST_HEAD(&ep_priv->td_list);
702 ep_priv->ep = ep;
703 ep->hcpriv = ep_priv;
704 return ep_priv;
705 }
706
707 static int alloc_isoc_etds(struct imx21 *imx21, struct ep_priv *ep_priv)
708 {
709 int i, j;
710 int etd_num;
711
712 /* Allocate the ETDs if required */
713 for (i = 0; i < NUM_ISO_ETDS; i++) {
714 if (ep_priv->etd[i] < 0) {
715 etd_num = alloc_etd(imx21);
716 if (etd_num < 0)
717 goto alloc_etd_failed;
718
719 ep_priv->etd[i] = etd_num;
720 imx21->etd[etd_num].ep = ep_priv->ep;
721 }
722 }
723 return 0;
724
725 alloc_etd_failed:
726 dev_err(imx21->dev, "isoc: Couldn't allocate etd\n");
727 for (j = 0; j < i; j++) {
728 free_etd(imx21, ep_priv->etd[j]);
729 ep_priv->etd[j] = -1;
730 }
731 return -ENOMEM;
732 }
733
734 static int imx21_hc_urb_enqueue_isoc(struct usb_hcd *hcd,
735 struct usb_host_endpoint *ep,
736 struct urb *urb, gfp_t mem_flags)
737 {
738 struct imx21 *imx21 = hcd_to_imx21(hcd);
739 struct urb_priv *urb_priv;
740 unsigned long flags;
741 struct ep_priv *ep_priv;
742 struct td *td = NULL;
743 int i;
744 int ret;
745 int cur_frame;
746 u16 maxpacket;
747
748 urb_priv = kzalloc(sizeof(struct urb_priv), mem_flags);
749 if (urb_priv == NULL)
750 return -ENOMEM;
751
752 urb_priv->isoc_td = kzalloc(
753 sizeof(struct td) * urb->number_of_packets, mem_flags);
754 if (urb_priv->isoc_td == NULL) {
755 ret = -ENOMEM;
756 goto alloc_td_failed;
757 }
758
759 spin_lock_irqsave(&imx21->lock, flags);
760
761 if (ep->hcpriv == NULL) {
762 ep_priv = alloc_isoc_ep(imx21, ep);
763 if (ep_priv == NULL) {
764 ret = -ENOMEM;
765 goto alloc_ep_failed;
766 }
767 } else {
768 ep_priv = ep->hcpriv;
769 }
770
771 ret = alloc_isoc_etds(imx21, ep_priv);
772 if (ret)
773 goto alloc_etd_failed;
774
775 ret = usb_hcd_link_urb_to_ep(hcd, urb);
776 if (ret)
777 goto link_failed;
778
779 urb->status = -EINPROGRESS;
780 urb->actual_length = 0;
781 urb->error_count = 0;
782 urb->hcpriv = urb_priv;
783 urb_priv->ep = ep;
784
785 /* allocate data memory for largest packets if not already done */
786 maxpacket = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
787 for (i = 0; i < NUM_ISO_ETDS; i++) {
788 struct etd_priv *etd = &imx21->etd[ep_priv->etd[i]];
789
790 if (etd->dmem_size > 0 && etd->dmem_size < maxpacket) {
791 /* not sure if this can really occur.... */
792 dev_err(imx21->dev, "increasing isoc buffer %d->%d\n",
793 etd->dmem_size, maxpacket);
794 ret = -EMSGSIZE;
795 goto alloc_dmem_failed;
796 }
797
798 if (etd->dmem_size == 0) {
799 etd->dmem_offset = alloc_dmem(imx21, maxpacket, ep);
800 if (etd->dmem_offset < 0) {
801 dev_dbg(imx21->dev, "failed alloc isoc dmem\n");
802 ret = -EAGAIN;
803 goto alloc_dmem_failed;
804 }
805 etd->dmem_size = maxpacket;
806 }
807 }
808
809 /* calculate frame */
810 cur_frame = imx21_hc_get_frame(hcd);
811 if (urb->transfer_flags & URB_ISO_ASAP) {
812 if (list_empty(&ep_priv->td_list))
813 urb->start_frame = cur_frame + 5;
814 else
815 urb->start_frame = list_entry(
816 ep_priv->td_list.prev,
817 struct td, list)->frame + urb->interval;
818 }
819 urb->start_frame = wrap_frame(urb->start_frame);
820 if (frame_after(cur_frame, urb->start_frame)) {
821 dev_dbg(imx21->dev,
822 "enqueue: adjusting iso start %d (cur=%d) asap=%d\n",
823 urb->start_frame, cur_frame,
824 (urb->transfer_flags & URB_ISO_ASAP) != 0);
825 urb->start_frame = wrap_frame(cur_frame + 1);
826 }
827
828 /* set up transfers */
829 td = urb_priv->isoc_td;
830 for (i = 0; i < urb->number_of_packets; i++, td++) {
831 unsigned int offset = urb->iso_frame_desc[i].offset;
832 td->ep = ep;
833 td->urb = urb;
834 td->len = urb->iso_frame_desc[i].length;
835 td->isoc_index = i;
836 td->frame = wrap_frame(urb->start_frame + urb->interval * i);
837 td->dma_handle = urb->transfer_dma + offset;
838 td->cpu_buffer = urb->transfer_buffer + offset;
839 list_add_tail(&td->list, &ep_priv->td_list);
840 }
841
842 urb_priv->isoc_remaining = urb->number_of_packets;
843 dev_vdbg(imx21->dev, "setup %d packets for iso frame %d->%d\n",
844 urb->number_of_packets, urb->start_frame, td->frame);
845
846 debug_urb_submitted(imx21, urb);
847 schedule_isoc_etds(hcd, ep);
848
849 spin_unlock_irqrestore(&imx21->lock, flags);
850 return 0;
851
852 alloc_dmem_failed:
853 usb_hcd_unlink_urb_from_ep(hcd, urb);
854
855 link_failed:
856 alloc_etd_failed:
857 alloc_ep_failed:
858 spin_unlock_irqrestore(&imx21->lock, flags);
859 kfree(urb_priv->isoc_td);
860
861 alloc_td_failed:
862 kfree(urb_priv);
863 return ret;
864 }
865
866 static void dequeue_isoc_urb(struct imx21 *imx21,
867 struct urb *urb, struct ep_priv *ep_priv)
868 {
869 struct urb_priv *urb_priv = urb->hcpriv;
870 struct td *td, *tmp;
871 int i;
872
873 if (urb_priv->active) {
874 for (i = 0; i < NUM_ISO_ETDS; i++) {
875 int etd_num = ep_priv->etd[i];
876 if (etd_num != -1 && imx21->etd[etd_num].urb == urb) {
877 struct etd_priv *etd = imx21->etd + etd_num;
878
879 reset_etd(imx21, etd_num);
880 free_dmem(imx21, etd);
881 }
882 }
883 }
884
885 list_for_each_entry_safe(td, tmp, &ep_priv->td_list, list) {
886 if (td->urb == urb) {
887 dev_vdbg(imx21->dev, "removing td %p\n", td);
888 list_del(&td->list);
889 }
890 }
891 }
892
893 /* =========================================== */
894 /* NON ISOC Handling ... */
895 /* =========================================== */
896
897 static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb)
898 {
899 unsigned int pipe = urb->pipe;
900 struct urb_priv *urb_priv = urb->hcpriv;
901 struct ep_priv *ep_priv = urb_priv->ep->hcpriv;
902 int state = urb_priv->state;
903 int etd_num = ep_priv->etd[0];
904 struct etd_priv *etd;
905 u32 count;
906 u16 etd_buf_size;
907 u16 maxpacket;
908 u8 dir;
909 u8 bufround;
910 u8 datatoggle;
911 u8 interval = 0;
912 u8 relpolpos = 0;
913
914 if (etd_num < 0) {
915 dev_err(imx21->dev, "No valid ETD\n");
916 return;
917 }
918 if (readl(imx21->regs + USBH_ETDENSET) & (1 << etd_num))
919 dev_err(imx21->dev, "submitting to active ETD %d\n", etd_num);
920
921 etd = &imx21->etd[etd_num];
922 maxpacket = usb_maxpacket(urb->dev, pipe, usb_pipeout(pipe));
923 if (!maxpacket)
924 maxpacket = 8;
925
926 if (usb_pipecontrol(pipe) && (state != US_CTRL_DATA)) {
927 if (state == US_CTRL_SETUP) {
928 dir = TD_DIR_SETUP;
929 if (unsuitable_for_dma(urb->setup_dma))
930 usb_hcd_unmap_urb_setup_for_dma(imx21->hcd,
931 urb);
932 etd->dma_handle = urb->setup_dma;
933 etd->cpu_buffer = urb->setup_packet;
934 bufround = 0;
935 count = 8;
936 datatoggle = TD_TOGGLE_DATA0;
937 } else { /* US_CTRL_ACK */
938 dir = usb_pipeout(pipe) ? TD_DIR_IN : TD_DIR_OUT;
939 bufround = 0;
940 count = 0;
941 datatoggle = TD_TOGGLE_DATA1;
942 }
943 } else {
944 dir = usb_pipeout(pipe) ? TD_DIR_OUT : TD_DIR_IN;
945 bufround = (dir == TD_DIR_IN) ? 1 : 0;
946 if (unsuitable_for_dma(urb->transfer_dma))
947 usb_hcd_unmap_urb_for_dma(imx21->hcd, urb);
948
949 etd->dma_handle = urb->transfer_dma;
950 etd->cpu_buffer = urb->transfer_buffer;
951 if (usb_pipebulk(pipe) && (state == US_BULK0))
952 count = 0;
953 else
954 count = urb->transfer_buffer_length;
955
956 if (usb_pipecontrol(pipe)) {
957 datatoggle = TD_TOGGLE_DATA1;
958 } else {
959 if (usb_gettoggle(
960 urb->dev,
961 usb_pipeendpoint(urb->pipe),
962 usb_pipeout(urb->pipe)))
963 datatoggle = TD_TOGGLE_DATA1;
964 else
965 datatoggle = TD_TOGGLE_DATA0;
966 }
967 }
968
969 etd->urb = urb;
970 etd->ep = urb_priv->ep;
971 etd->len = count;
972
973 if (usb_pipeint(pipe)) {
974 interval = urb->interval;
975 relpolpos = (readl(imx21->regs + USBH_FRMNUB) + 1) & 0xff;
976 }
977
978 /* Write ETD to device memory */
979 setup_etd_dword0(imx21, etd_num, urb, dir, maxpacket);
980
981 etd_writel(imx21, etd_num, 2,
982 (u32) interval << DW2_POLINTERV |
983 ((u32) relpolpos << DW2_RELPOLPOS) |
984 ((u32) dir << DW2_DIRPID) |
985 ((u32) bufround << DW2_BUFROUND) |
986 ((u32) datatoggle << DW2_DATATOG) |
987 ((u32) TD_NOTACCESSED << DW2_COMPCODE));
988
989 /* DMA will always transfer buffer size even if TOBYCNT in DWORD3
990 is smaller. Make sure we don't overrun the buffer!
991 */
992 if (count && count < maxpacket)
993 etd_buf_size = count;
994 else
995 etd_buf_size = maxpacket;
996
997 etd_writel(imx21, etd_num, 3,
998 ((u32) (etd_buf_size - 1) << DW3_BUFSIZE) | (u32) count);
999
1000 if (!count)
1001 etd->dma_handle = 0;
1002
1003 /* allocate x and y buffer space at once */
1004 etd->dmem_size = (count > maxpacket) ? maxpacket * 2 : maxpacket;
1005 etd->dmem_offset = alloc_dmem(imx21, etd->dmem_size, urb_priv->ep);
1006 if (etd->dmem_offset < 0) {
1007 /* Setup everything we can in HW and update when we get DMEM */
1008 etd_writel(imx21, etd_num, 1, (u32)maxpacket << 16);
1009
1010 dev_dbg(imx21->dev, "Queuing etd %d for DMEM\n", etd_num);
1011 debug_urb_queued_for_dmem(imx21, urb);
1012 list_add_tail(&etd->queue, &imx21->queue_for_dmem);
1013 return;
1014 }
1015
1016 etd_writel(imx21, etd_num, 1,
1017 (((u32) etd->dmem_offset + (u32) maxpacket) << DW1_YBUFSRTAD) |
1018 (u32) etd->dmem_offset);
1019
1020 urb_priv->active = 1;
1021
1022 /* enable the ETD to kick off transfer */
1023 dev_vdbg(imx21->dev, "Activating etd %d for %d bytes %s\n",
1024 etd_num, count, dir != TD_DIR_IN ? "out" : "in");
1025 activate_etd(imx21, etd_num, dir);
1026
1027 }
1028
1029 static void nonisoc_etd_done(struct usb_hcd *hcd, int etd_num)
1030 {
1031 struct imx21 *imx21 = hcd_to_imx21(hcd);
1032 struct etd_priv *etd = &imx21->etd[etd_num];
1033 struct urb *urb = etd->urb;
1034 u32 etd_mask = 1 << etd_num;
1035 struct urb_priv *urb_priv = urb->hcpriv;
1036 int dir;
1037 int cc;
1038 u32 bytes_xfrd;
1039 int etd_done;
1040
1041 disactivate_etd(imx21, etd_num);
1042
1043 dir = (etd_readl(imx21, etd_num, 0) >> DW0_DIRECT) & 0x3;
1044 cc = (etd_readl(imx21, etd_num, 2) >> DW2_COMPCODE) & 0xf;
1045 bytes_xfrd = etd->len - (etd_readl(imx21, etd_num, 3) & 0x1fffff);
1046
1047 /* save toggle carry */
1048 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
1049 usb_pipeout(urb->pipe),
1050 (etd_readl(imx21, etd_num, 0) >> DW0_TOGCRY) & 0x1);
1051
1052 if (dir == TD_DIR_IN) {
1053 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
1054 clear_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
1055
1056 if (etd->bounce_buffer) {
1057 memcpy(etd->cpu_buffer, etd->bounce_buffer, bytes_xfrd);
1058 dma_unmap_single(imx21->dev,
1059 etd->dma_handle, etd->len, DMA_FROM_DEVICE);
1060 } else if (!etd->dma_handle && bytes_xfrd) {/* PIO */
1061 memcpy_fromio(etd->cpu_buffer,
1062 imx21->regs + USBOTG_DMEM + etd->dmem_offset,
1063 bytes_xfrd);
1064 }
1065 }
1066
1067 kfree(etd->bounce_buffer);
1068 etd->bounce_buffer = NULL;
1069 free_dmem(imx21, etd);
1070
1071 urb->error_count = 0;
1072 if (!(urb->transfer_flags & URB_SHORT_NOT_OK)
1073 && (cc == TD_DATAUNDERRUN))
1074 cc = TD_CC_NOERROR;
1075
1076 if (cc != 0)
1077 dev_vdbg(imx21->dev, "cc is 0x%x\n", cc);
1078
1079 etd_done = (cc_to_error[cc] != 0); /* stop if error */
1080
1081 switch (usb_pipetype(urb->pipe)) {
1082 case PIPE_CONTROL:
1083 switch (urb_priv->state) {
1084 case US_CTRL_SETUP:
1085 if (urb->transfer_buffer_length > 0)
1086 urb_priv->state = US_CTRL_DATA;
1087 else
1088 urb_priv->state = US_CTRL_ACK;
1089 break;
1090 case US_CTRL_DATA:
1091 urb->actual_length += bytes_xfrd;
1092 urb_priv->state = US_CTRL_ACK;
1093 break;
1094 case US_CTRL_ACK:
1095 etd_done = 1;
1096 break;
1097 default:
1098 dev_err(imx21->dev,
1099 "Invalid pipe state %d\n", urb_priv->state);
1100 etd_done = 1;
1101 break;
1102 }
1103 break;
1104
1105 case PIPE_BULK:
1106 urb->actual_length += bytes_xfrd;
1107 if ((urb_priv->state == US_BULK)
1108 && (urb->transfer_flags & URB_ZERO_PACKET)
1109 && urb->transfer_buffer_length > 0
1110 && ((urb->transfer_buffer_length %
1111 usb_maxpacket(urb->dev, urb->pipe,
1112 usb_pipeout(urb->pipe))) == 0)) {
1113 /* need a 0-packet */
1114 urb_priv->state = US_BULK0;
1115 } else {
1116 etd_done = 1;
1117 }
1118 break;
1119
1120 case PIPE_INTERRUPT:
1121 urb->actual_length += bytes_xfrd;
1122 etd_done = 1;
1123 break;
1124 }
1125
1126 if (etd_done)
1127 nonisoc_urb_completed_for_etd(imx21, etd, cc_to_error[cc]);
1128 else {
1129 dev_vdbg(imx21->dev, "next state=%d\n", urb_priv->state);
1130 schedule_nonisoc_etd(imx21, urb);
1131 }
1132 }
1133
1134
1135 static struct ep_priv *alloc_ep(void)
1136 {
1137 int i;
1138 struct ep_priv *ep_priv;
1139
1140 ep_priv = kzalloc(sizeof(struct ep_priv), GFP_ATOMIC);
1141 if (!ep_priv)
1142 return NULL;
1143
1144 for (i = 0; i < NUM_ISO_ETDS; ++i)
1145 ep_priv->etd[i] = -1;
1146
1147 return ep_priv;
1148 }
1149
1150 static int imx21_hc_urb_enqueue(struct usb_hcd *hcd,
1151 struct urb *urb, gfp_t mem_flags)
1152 {
1153 struct imx21 *imx21 = hcd_to_imx21(hcd);
1154 struct usb_host_endpoint *ep = urb->ep;
1155 struct urb_priv *urb_priv;
1156 struct ep_priv *ep_priv;
1157 struct etd_priv *etd;
1158 int ret;
1159 unsigned long flags;
1160
1161 dev_vdbg(imx21->dev,
1162 "enqueue urb=%p ep=%p len=%d "
1163 "buffer=%p dma=%08X setupBuf=%p setupDma=%08X\n",
1164 urb, ep,
1165 urb->transfer_buffer_length,
1166 urb->transfer_buffer, urb->transfer_dma,
1167 urb->setup_packet, urb->setup_dma);
1168
1169 if (usb_pipeisoc(urb->pipe))
1170 return imx21_hc_urb_enqueue_isoc(hcd, ep, urb, mem_flags);
1171
1172 urb_priv = kzalloc(sizeof(struct urb_priv), mem_flags);
1173 if (!urb_priv)
1174 return -ENOMEM;
1175
1176 spin_lock_irqsave(&imx21->lock, flags);
1177
1178 ep_priv = ep->hcpriv;
1179 if (ep_priv == NULL) {
1180 ep_priv = alloc_ep();
1181 if (!ep_priv) {
1182 ret = -ENOMEM;
1183 goto failed_alloc_ep;
1184 }
1185 ep->hcpriv = ep_priv;
1186 ep_priv->ep = ep;
1187 }
1188
1189 ret = usb_hcd_link_urb_to_ep(hcd, urb);
1190 if (ret)
1191 goto failed_link;
1192
1193 urb->status = -EINPROGRESS;
1194 urb->actual_length = 0;
1195 urb->error_count = 0;
1196 urb->hcpriv = urb_priv;
1197 urb_priv->ep = ep;
1198
1199 switch (usb_pipetype(urb->pipe)) {
1200 case PIPE_CONTROL:
1201 urb_priv->state = US_CTRL_SETUP;
1202 break;
1203 case PIPE_BULK:
1204 urb_priv->state = US_BULK;
1205 break;
1206 }
1207
1208 debug_urb_submitted(imx21, urb);
1209 if (ep_priv->etd[0] < 0) {
1210 if (ep_priv->waiting_etd) {
1211 dev_dbg(imx21->dev,
1212 "no ETD available already queued %p\n",
1213 ep_priv);
1214 debug_urb_queued_for_etd(imx21, urb);
1215 goto out;
1216 }
1217 ep_priv->etd[0] = alloc_etd(imx21);
1218 if (ep_priv->etd[0] < 0) {
1219 dev_dbg(imx21->dev,
1220 "no ETD available queueing %p\n", ep_priv);
1221 debug_urb_queued_for_etd(imx21, urb);
1222 list_add_tail(&ep_priv->queue, &imx21->queue_for_etd);
1223 ep_priv->waiting_etd = 1;
1224 goto out;
1225 }
1226 }
1227
1228 /* Schedule if no URB already active for this endpoint */
1229 etd = &imx21->etd[ep_priv->etd[0]];
1230 if (etd->urb == NULL) {
1231 DEBUG_LOG_FRAME(imx21, etd, last_req);
1232 schedule_nonisoc_etd(imx21, urb);
1233 }
1234
1235 out:
1236 spin_unlock_irqrestore(&imx21->lock, flags);
1237 return 0;
1238
1239 failed_link:
1240 failed_alloc_ep:
1241 spin_unlock_irqrestore(&imx21->lock, flags);
1242 kfree(urb_priv);
1243 return ret;
1244 }
1245
1246 static int imx21_hc_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
1247 int status)
1248 {
1249 struct imx21 *imx21 = hcd_to_imx21(hcd);
1250 unsigned long flags;
1251 struct usb_host_endpoint *ep;
1252 struct ep_priv *ep_priv;
1253 struct urb_priv *urb_priv = urb->hcpriv;
1254 int ret = -EINVAL;
1255
1256 dev_vdbg(imx21->dev, "dequeue urb=%p iso=%d status=%d\n",
1257 urb, usb_pipeisoc(urb->pipe), status);
1258
1259 spin_lock_irqsave(&imx21->lock, flags);
1260
1261 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
1262 if (ret)
1263 goto fail;
1264 ep = urb_priv->ep;
1265 ep_priv = ep->hcpriv;
1266
1267 debug_urb_unlinked(imx21, urb);
1268
1269 if (usb_pipeisoc(urb->pipe)) {
1270 dequeue_isoc_urb(imx21, urb, ep_priv);
1271 schedule_isoc_etds(hcd, ep);
1272 } else if (urb_priv->active) {
1273 int etd_num = ep_priv->etd[0];
1274 if (etd_num != -1) {
1275 struct etd_priv *etd = &imx21->etd[etd_num];
1276
1277 disactivate_etd(imx21, etd_num);
1278 free_dmem(imx21, etd);
1279 etd->urb = NULL;
1280 kfree(etd->bounce_buffer);
1281 etd->bounce_buffer = NULL;
1282 }
1283 }
1284
1285 urb_done(hcd, urb, status);
1286
1287 spin_unlock_irqrestore(&imx21->lock, flags);
1288 return 0;
1289
1290 fail:
1291 spin_unlock_irqrestore(&imx21->lock, flags);
1292 return ret;
1293 }
1294
1295 /* =========================================== */
1296 /* Interrupt dispatch */
1297 /* =========================================== */
1298
1299 static void process_etds(struct usb_hcd *hcd, struct imx21 *imx21, int sof)
1300 {
1301 int etd_num;
1302 int enable_sof_int = 0;
1303 unsigned long flags;
1304
1305 spin_lock_irqsave(&imx21->lock, flags);
1306
1307 for (etd_num = 0; etd_num < USB_NUM_ETD; etd_num++) {
1308 u32 etd_mask = 1 << etd_num;
1309 u32 enabled = readl(imx21->regs + USBH_ETDENSET) & etd_mask;
1310 u32 done = readl(imx21->regs + USBH_ETDDONESTAT) & etd_mask;
1311 struct etd_priv *etd = &imx21->etd[etd_num];
1312
1313
1314 if (done) {
1315 DEBUG_LOG_FRAME(imx21, etd, last_int);
1316 } else {
1317 /*
1318 * Kludge warning!
1319 *
1320 * When multiple transfers are using the bus we sometimes get into a state
1321 * where the transfer has completed (the CC field of the ETD is != 0x0F),
1322 * the ETD has self disabled but the ETDDONESTAT flag is not set
1323 * (and hence no interrupt occurs).
1324 * This causes the transfer in question to hang.
1325 * The kludge below checks for this condition at each SOF and processes any
1326 * blocked ETDs (after an arbitary 10 frame wait)
1327 *
1328 * With a single active transfer the usbtest test suite will run for days
1329 * without the kludge.
1330 * With other bus activity (eg mass storage) even just test1 will hang without
1331 * the kludge.
1332 */
1333 u32 dword0;
1334 int cc;
1335
1336 if (etd->active_count && !enabled) /* suspicious... */
1337 enable_sof_int = 1;
1338
1339 if (!sof || enabled || !etd->active_count)
1340 continue;
1341
1342 cc = etd_readl(imx21, etd_num, 2) >> DW2_COMPCODE;
1343 if (cc == TD_NOTACCESSED)
1344 continue;
1345
1346 if (++etd->active_count < 10)
1347 continue;
1348
1349 dword0 = etd_readl(imx21, etd_num, 0);
1350 dev_dbg(imx21->dev,
1351 "unblock ETD %d dev=0x%X ep=0x%X cc=0x%02X!\n",
1352 etd_num, dword0 & 0x7F,
1353 (dword0 >> DW0_ENDPNT) & 0x0F,
1354 cc);
1355
1356 #ifdef DEBUG
1357 dev_dbg(imx21->dev,
1358 "frame: act=%d disact=%d"
1359 " int=%d req=%d cur=%d\n",
1360 etd->activated_frame,
1361 etd->disactivated_frame,
1362 etd->last_int_frame,
1363 etd->last_req_frame,
1364 readl(imx21->regs + USBH_FRMNUB));
1365 imx21->debug_unblocks++;
1366 #endif
1367 etd->active_count = 0;
1368 /* End of kludge */
1369 }
1370
1371 if (etd->ep == NULL || etd->urb == NULL) {
1372 dev_dbg(imx21->dev,
1373 "Interrupt for unexpected etd %d"
1374 " ep=%p urb=%p\n",
1375 etd_num, etd->ep, etd->urb);
1376 disactivate_etd(imx21, etd_num);
1377 continue;
1378 }
1379
1380 if (usb_pipeisoc(etd->urb->pipe))
1381 isoc_etd_done(hcd, etd_num);
1382 else
1383 nonisoc_etd_done(hcd, etd_num);
1384 }
1385
1386 /* only enable SOF interrupt if it may be needed for the kludge */
1387 if (enable_sof_int)
1388 set_register_bits(imx21, USBH_SYSIEN, USBH_SYSIEN_SOFINT);
1389 else
1390 clear_register_bits(imx21, USBH_SYSIEN, USBH_SYSIEN_SOFINT);
1391
1392
1393 spin_unlock_irqrestore(&imx21->lock, flags);
1394 }
1395
1396 static irqreturn_t imx21_irq(struct usb_hcd *hcd)
1397 {
1398 struct imx21 *imx21 = hcd_to_imx21(hcd);
1399 u32 ints = readl(imx21->regs + USBH_SYSISR);
1400
1401 if (ints & USBH_SYSIEN_HERRINT)
1402 dev_dbg(imx21->dev, "Scheduling error\n");
1403
1404 if (ints & USBH_SYSIEN_SORINT)
1405 dev_dbg(imx21->dev, "Scheduling overrun\n");
1406
1407 if (ints & (USBH_SYSISR_DONEINT | USBH_SYSISR_SOFINT))
1408 process_etds(hcd, imx21, ints & USBH_SYSISR_SOFINT);
1409
1410 writel(ints, imx21->regs + USBH_SYSISR);
1411 return IRQ_HANDLED;
1412 }
1413
1414 static void imx21_hc_endpoint_disable(struct usb_hcd *hcd,
1415 struct usb_host_endpoint *ep)
1416 {
1417 struct imx21 *imx21 = hcd_to_imx21(hcd);
1418 unsigned long flags;
1419 struct ep_priv *ep_priv;
1420 int i;
1421
1422 if (ep == NULL)
1423 return;
1424
1425 spin_lock_irqsave(&imx21->lock, flags);
1426 ep_priv = ep->hcpriv;
1427 dev_vdbg(imx21->dev, "disable ep=%p, ep->hcpriv=%p\n", ep, ep_priv);
1428
1429 if (!list_empty(&ep->urb_list))
1430 dev_dbg(imx21->dev, "ep's URB list is not empty\n");
1431
1432 if (ep_priv != NULL) {
1433 for (i = 0; i < NUM_ISO_ETDS; i++) {
1434 if (ep_priv->etd[i] > -1)
1435 dev_dbg(imx21->dev, "free etd %d for disable\n",
1436 ep_priv->etd[i]);
1437
1438 free_etd(imx21, ep_priv->etd[i]);
1439 }
1440 kfree(ep_priv);
1441 ep->hcpriv = NULL;
1442 }
1443
1444 for (i = 0; i < USB_NUM_ETD; i++) {
1445 if (imx21->etd[i].alloc && imx21->etd[i].ep == ep) {
1446 dev_err(imx21->dev,
1447 "Active etd %d for disabled ep=%p!\n", i, ep);
1448 free_etd(imx21, i);
1449 }
1450 }
1451 free_epdmem(imx21, ep);
1452 spin_unlock_irqrestore(&imx21->lock, flags);
1453 }
1454
1455 /* =========================================== */
1456 /* Hub handling */
1457 /* =========================================== */
1458
1459 static int get_hub_descriptor(struct usb_hcd *hcd,
1460 struct usb_hub_descriptor *desc)
1461 {
1462 struct imx21 *imx21 = hcd_to_imx21(hcd);
1463 desc->bDescriptorType = 0x29; /* HUB descriptor */
1464 desc->bHubContrCurrent = 0;
1465
1466 desc->bNbrPorts = readl(imx21->regs + USBH_ROOTHUBA)
1467 & USBH_ROOTHUBA_NDNSTMPRT_MASK;
1468 desc->bDescLength = 9;
1469 desc->bPwrOn2PwrGood = 0;
1470 desc->wHubCharacteristics = (__force __u16) cpu_to_le16(
1471 0x0002 | /* No power switching */
1472 0x0010 | /* No over current protection */
1473 0);
1474
1475 desc->u.hs.DeviceRemovable[0] = 1 << 1;
1476 desc->u.hs.DeviceRemovable[1] = ~0;
1477 return 0;
1478 }
1479
1480 static int imx21_hc_hub_status_data(struct usb_hcd *hcd, char *buf)
1481 {
1482 struct imx21 *imx21 = hcd_to_imx21(hcd);
1483 int ports;
1484 int changed = 0;
1485 int i;
1486 unsigned long flags;
1487
1488 spin_lock_irqsave(&imx21->lock, flags);
1489 ports = readl(imx21->regs + USBH_ROOTHUBA)
1490 & USBH_ROOTHUBA_NDNSTMPRT_MASK;
1491 if (ports > 7) {
1492 ports = 7;
1493 dev_err(imx21->dev, "ports %d > 7\n", ports);
1494 }
1495 for (i = 0; i < ports; i++) {
1496 if (readl(imx21->regs + USBH_PORTSTAT(i)) &
1497 (USBH_PORTSTAT_CONNECTSC |
1498 USBH_PORTSTAT_PRTENBLSC |
1499 USBH_PORTSTAT_PRTSTATSC |
1500 USBH_PORTSTAT_OVRCURIC |
1501 USBH_PORTSTAT_PRTRSTSC)) {
1502
1503 changed = 1;
1504 buf[0] |= 1 << (i + 1);
1505 }
1506 }
1507 spin_unlock_irqrestore(&imx21->lock, flags);
1508
1509 if (changed)
1510 dev_info(imx21->dev, "Hub status changed\n");
1511 return changed;
1512 }
1513
1514 static int imx21_hc_hub_control(struct usb_hcd *hcd,
1515 u16 typeReq,
1516 u16 wValue, u16 wIndex, char *buf, u16 wLength)
1517 {
1518 struct imx21 *imx21 = hcd_to_imx21(hcd);
1519 int rc = 0;
1520 u32 status_write = 0;
1521
1522 switch (typeReq) {
1523 case ClearHubFeature:
1524 dev_dbg(imx21->dev, "ClearHubFeature\n");
1525 switch (wValue) {
1526 case C_HUB_OVER_CURRENT:
1527 dev_dbg(imx21->dev, " OVER_CURRENT\n");
1528 break;
1529 case C_HUB_LOCAL_POWER:
1530 dev_dbg(imx21->dev, " LOCAL_POWER\n");
1531 break;
1532 default:
1533 dev_dbg(imx21->dev, " unknown\n");
1534 rc = -EINVAL;
1535 break;
1536 }
1537 break;
1538
1539 case ClearPortFeature:
1540 dev_dbg(imx21->dev, "ClearPortFeature\n");
1541 switch (wValue) {
1542 case USB_PORT_FEAT_ENABLE:
1543 dev_dbg(imx21->dev, " ENABLE\n");
1544 status_write = USBH_PORTSTAT_CURCONST;
1545 break;
1546 case USB_PORT_FEAT_SUSPEND:
1547 dev_dbg(imx21->dev, " SUSPEND\n");
1548 status_write = USBH_PORTSTAT_PRTOVRCURI;
1549 break;
1550 case USB_PORT_FEAT_POWER:
1551 dev_dbg(imx21->dev, " POWER\n");
1552 status_write = USBH_PORTSTAT_LSDEVCON;
1553 break;
1554 case USB_PORT_FEAT_C_ENABLE:
1555 dev_dbg(imx21->dev, " C_ENABLE\n");
1556 status_write = USBH_PORTSTAT_PRTENBLSC;
1557 break;
1558 case USB_PORT_FEAT_C_SUSPEND:
1559 dev_dbg(imx21->dev, " C_SUSPEND\n");
1560 status_write = USBH_PORTSTAT_PRTSTATSC;
1561 break;
1562 case USB_PORT_FEAT_C_CONNECTION:
1563 dev_dbg(imx21->dev, " C_CONNECTION\n");
1564 status_write = USBH_PORTSTAT_CONNECTSC;
1565 break;
1566 case USB_PORT_FEAT_C_OVER_CURRENT:
1567 dev_dbg(imx21->dev, " C_OVER_CURRENT\n");
1568 status_write = USBH_PORTSTAT_OVRCURIC;
1569 break;
1570 case USB_PORT_FEAT_C_RESET:
1571 dev_dbg(imx21->dev, " C_RESET\n");
1572 status_write = USBH_PORTSTAT_PRTRSTSC;
1573 break;
1574 default:
1575 dev_dbg(imx21->dev, " unknown\n");
1576 rc = -EINVAL;
1577 break;
1578 }
1579
1580 break;
1581
1582 case GetHubDescriptor:
1583 dev_dbg(imx21->dev, "GetHubDescriptor\n");
1584 rc = get_hub_descriptor(hcd, (void *)buf);
1585 break;
1586
1587 case GetHubStatus:
1588 dev_dbg(imx21->dev, " GetHubStatus\n");
1589 *(__le32 *) buf = 0;
1590 break;
1591
1592 case GetPortStatus:
1593 dev_dbg(imx21->dev, "GetPortStatus: port: %d, 0x%x\n",
1594 wIndex, USBH_PORTSTAT(wIndex - 1));
1595 *(__le32 *) buf = readl(imx21->regs +
1596 USBH_PORTSTAT(wIndex - 1));
1597 break;
1598
1599 case SetHubFeature:
1600 dev_dbg(imx21->dev, "SetHubFeature\n");
1601 switch (wValue) {
1602 case C_HUB_OVER_CURRENT:
1603 dev_dbg(imx21->dev, " OVER_CURRENT\n");
1604 break;
1605
1606 case C_HUB_LOCAL_POWER:
1607 dev_dbg(imx21->dev, " LOCAL_POWER\n");
1608 break;
1609 default:
1610 dev_dbg(imx21->dev, " unknown\n");
1611 rc = -EINVAL;
1612 break;
1613 }
1614
1615 break;
1616
1617 case SetPortFeature:
1618 dev_dbg(imx21->dev, "SetPortFeature\n");
1619 switch (wValue) {
1620 case USB_PORT_FEAT_SUSPEND:
1621 dev_dbg(imx21->dev, " SUSPEND\n");
1622 status_write = USBH_PORTSTAT_PRTSUSPST;
1623 break;
1624 case USB_PORT_FEAT_POWER:
1625 dev_dbg(imx21->dev, " POWER\n");
1626 status_write = USBH_PORTSTAT_PRTPWRST;
1627 break;
1628 case USB_PORT_FEAT_RESET:
1629 dev_dbg(imx21->dev, " RESET\n");
1630 status_write = USBH_PORTSTAT_PRTRSTST;
1631 break;
1632 default:
1633 dev_dbg(imx21->dev, " unknown\n");
1634 rc = -EINVAL;
1635 break;
1636 }
1637 break;
1638
1639 default:
1640 dev_dbg(imx21->dev, " unknown\n");
1641 rc = -EINVAL;
1642 break;
1643 }
1644
1645 if (status_write)
1646 writel(status_write, imx21->regs + USBH_PORTSTAT(wIndex - 1));
1647 return rc;
1648 }
1649
1650 /* =========================================== */
1651 /* Host controller management */
1652 /* =========================================== */
1653
1654 static int imx21_hc_reset(struct usb_hcd *hcd)
1655 {
1656 struct imx21 *imx21 = hcd_to_imx21(hcd);
1657 unsigned long timeout;
1658 unsigned long flags;
1659
1660 spin_lock_irqsave(&imx21->lock, flags);
1661
1662 /* Reset the Host controller modules */
1663 writel(USBOTG_RST_RSTCTRL | USBOTG_RST_RSTRH |
1664 USBOTG_RST_RSTHSIE | USBOTG_RST_RSTHC,
1665 imx21->regs + USBOTG_RST_CTRL);
1666
1667 /* Wait for reset to finish */
1668 timeout = jiffies + HZ;
1669 while (readl(imx21->regs + USBOTG_RST_CTRL) != 0) {
1670 if (time_after(jiffies, timeout)) {
1671 spin_unlock_irqrestore(&imx21->lock, flags);
1672 dev_err(imx21->dev, "timeout waiting for reset\n");
1673 return -ETIMEDOUT;
1674 }
1675 spin_unlock_irq(&imx21->lock);
1676 schedule_timeout_uninterruptible(1);
1677 spin_lock_irq(&imx21->lock);
1678 }
1679 spin_unlock_irqrestore(&imx21->lock, flags);
1680 return 0;
1681 }
1682
1683 static int __devinit imx21_hc_start(struct usb_hcd *hcd)
1684 {
1685 struct imx21 *imx21 = hcd_to_imx21(hcd);
1686 unsigned long flags;
1687 int i, j;
1688 u32 hw_mode = USBOTG_HWMODE_CRECFG_HOST;
1689 u32 usb_control = 0;
1690
1691 hw_mode |= ((imx21->pdata->host_xcvr << USBOTG_HWMODE_HOSTXCVR_SHIFT) &
1692 USBOTG_HWMODE_HOSTXCVR_MASK);
1693 hw_mode |= ((imx21->pdata->otg_xcvr << USBOTG_HWMODE_OTGXCVR_SHIFT) &
1694 USBOTG_HWMODE_OTGXCVR_MASK);
1695
1696 if (imx21->pdata->host1_txenoe)
1697 usb_control |= USBCTRL_HOST1_TXEN_OE;
1698
1699 if (!imx21->pdata->host1_xcverless)
1700 usb_control |= USBCTRL_HOST1_BYP_TLL;
1701
1702 if (imx21->pdata->otg_ext_xcvr)
1703 usb_control |= USBCTRL_OTC_RCV_RXDP;
1704
1705
1706 spin_lock_irqsave(&imx21->lock, flags);
1707
1708 writel((USBOTG_CLK_CTRL_HST | USBOTG_CLK_CTRL_MAIN),
1709 imx21->regs + USBOTG_CLK_CTRL);
1710 writel(hw_mode, imx21->regs + USBOTG_HWMODE);
1711 writel(usb_control, imx21->regs + USBCTRL);
1712 writel(USB_MISCCONTROL_SKPRTRY | USB_MISCCONTROL_ARBMODE,
1713 imx21->regs + USB_MISCCONTROL);
1714
1715 /* Clear the ETDs */
1716 for (i = 0; i < USB_NUM_ETD; i++)
1717 for (j = 0; j < 4; j++)
1718 etd_writel(imx21, i, j, 0);
1719
1720 /* Take the HC out of reset */
1721 writel(USBH_HOST_CTRL_HCUSBSTE_OPERATIONAL | USBH_HOST_CTRL_CTLBLKSR_1,
1722 imx21->regs + USBH_HOST_CTRL);
1723
1724 /* Enable ports */
1725 if (imx21->pdata->enable_otg_host)
1726 writel(USBH_PORTSTAT_PRTPWRST | USBH_PORTSTAT_PRTENABST,
1727 imx21->regs + USBH_PORTSTAT(0));
1728
1729 if (imx21->pdata->enable_host1)
1730 writel(USBH_PORTSTAT_PRTPWRST | USBH_PORTSTAT_PRTENABST,
1731 imx21->regs + USBH_PORTSTAT(1));
1732
1733 if (imx21->pdata->enable_host2)
1734 writel(USBH_PORTSTAT_PRTPWRST | USBH_PORTSTAT_PRTENABST,
1735 imx21->regs + USBH_PORTSTAT(2));
1736
1737
1738 hcd->state = HC_STATE_RUNNING;
1739
1740 /* Enable host controller interrupts */
1741 set_register_bits(imx21, USBH_SYSIEN,
1742 USBH_SYSIEN_HERRINT |
1743 USBH_SYSIEN_DONEINT | USBH_SYSIEN_SORINT);
1744 set_register_bits(imx21, USBOTG_CINT_STEN, USBOTG_HCINT);
1745
1746 spin_unlock_irqrestore(&imx21->lock, flags);
1747
1748 return 0;
1749 }
1750
1751 static void imx21_hc_stop(struct usb_hcd *hcd)
1752 {
1753 struct imx21 *imx21 = hcd_to_imx21(hcd);
1754 unsigned long flags;
1755
1756 spin_lock_irqsave(&imx21->lock, flags);
1757
1758 writel(0, imx21->regs + USBH_SYSIEN);
1759 clear_register_bits(imx21, USBOTG_CINT_STEN, USBOTG_HCINT);
1760 clear_register_bits(imx21, USBOTG_CLK_CTRL_HST | USBOTG_CLK_CTRL_MAIN,
1761 USBOTG_CLK_CTRL);
1762 spin_unlock_irqrestore(&imx21->lock, flags);
1763 }
1764
1765 /* =========================================== */
1766 /* Driver glue */
1767 /* =========================================== */
1768
1769 static struct hc_driver imx21_hc_driver = {
1770 .description = hcd_name,
1771 .product_desc = "IMX21 USB Host Controller",
1772 .hcd_priv_size = sizeof(struct imx21),
1773
1774 .flags = HCD_USB11,
1775 .irq = imx21_irq,
1776
1777 .reset = imx21_hc_reset,
1778 .start = imx21_hc_start,
1779 .stop = imx21_hc_stop,
1780
1781 /* I/O requests */
1782 .urb_enqueue = imx21_hc_urb_enqueue,
1783 .urb_dequeue = imx21_hc_urb_dequeue,
1784 .endpoint_disable = imx21_hc_endpoint_disable,
1785
1786 /* scheduling support */
1787 .get_frame_number = imx21_hc_get_frame,
1788
1789 /* Root hub support */
1790 .hub_status_data = imx21_hc_hub_status_data,
1791 .hub_control = imx21_hc_hub_control,
1792
1793 };
1794
1795 static struct mx21_usbh_platform_data default_pdata = {
1796 .host_xcvr = MX21_USBXCVR_TXDIF_RXDIF,
1797 .otg_xcvr = MX21_USBXCVR_TXDIF_RXDIF,
1798 .enable_host1 = 1,
1799 .enable_host2 = 1,
1800 .enable_otg_host = 1,
1801
1802 };
1803
1804 static int imx21_remove(struct platform_device *pdev)
1805 {
1806 struct usb_hcd *hcd = platform_get_drvdata(pdev);
1807 struct imx21 *imx21 = hcd_to_imx21(hcd);
1808 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1809
1810 remove_debug_files(imx21);
1811 usb_remove_hcd(hcd);
1812
1813 if (res != NULL) {
1814 clk_disable(imx21->clk);
1815 clk_put(imx21->clk);
1816 iounmap(imx21->regs);
1817 release_mem_region(res->start, resource_size(res));
1818 }
1819
1820 kfree(hcd);
1821 return 0;
1822 }
1823
1824
1825 static int imx21_probe(struct platform_device *pdev)
1826 {
1827 struct usb_hcd *hcd;
1828 struct imx21 *imx21;
1829 struct resource *res;
1830 int ret;
1831 int irq;
1832
1833 printk(KERN_INFO "%s\n", imx21_hc_driver.product_desc);
1834
1835 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1836 if (!res)
1837 return -ENODEV;
1838 irq = platform_get_irq(pdev, 0);
1839 if (irq < 0)
1840 return -ENXIO;
1841
1842 hcd = usb_create_hcd(&imx21_hc_driver,
1843 &pdev->dev, dev_name(&pdev->dev));
1844 if (hcd == NULL) {
1845 dev_err(&pdev->dev, "Cannot create hcd (%s)\n",
1846 dev_name(&pdev->dev));
1847 return -ENOMEM;
1848 }
1849
1850 imx21 = hcd_to_imx21(hcd);
1851 imx21->hcd = hcd;
1852 imx21->dev = &pdev->dev;
1853 imx21->pdata = pdev->dev.platform_data;
1854 if (!imx21->pdata)
1855 imx21->pdata = &default_pdata;
1856
1857 spin_lock_init(&imx21->lock);
1858 INIT_LIST_HEAD(&imx21->dmem_list);
1859 INIT_LIST_HEAD(&imx21->queue_for_etd);
1860 INIT_LIST_HEAD(&imx21->queue_for_dmem);
1861 create_debug_files(imx21);
1862
1863 res = request_mem_region(res->start, resource_size(res), hcd_name);
1864 if (!res) {
1865 ret = -EBUSY;
1866 goto failed_request_mem;
1867 }
1868
1869 imx21->regs = ioremap(res->start, resource_size(res));
1870 if (imx21->regs == NULL) {
1871 dev_err(imx21->dev, "Cannot map registers\n");
1872 ret = -ENOMEM;
1873 goto failed_ioremap;
1874 }
1875
1876 /* Enable clocks source */
1877 imx21->clk = clk_get(imx21->dev, NULL);
1878 if (IS_ERR(imx21->clk)) {
1879 dev_err(imx21->dev, "no clock found\n");
1880 ret = PTR_ERR(imx21->clk);
1881 goto failed_clock_get;
1882 }
1883
1884 ret = clk_set_rate(imx21->clk, clk_round_rate(imx21->clk, 48000000));
1885 if (ret)
1886 goto failed_clock_set;
1887 ret = clk_enable(imx21->clk);
1888 if (ret)
1889 goto failed_clock_enable;
1890
1891 dev_info(imx21->dev, "Hardware HC revision: 0x%02X\n",
1892 (readl(imx21->regs + USBOTG_HWMODE) >> 16) & 0xFF);
1893
1894 ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
1895 if (ret != 0) {
1896 dev_err(imx21->dev, "usb_add_hcd() returned %d\n", ret);
1897 goto failed_add_hcd;
1898 }
1899
1900 return 0;
1901
1902 failed_add_hcd:
1903 clk_disable(imx21->clk);
1904 failed_clock_enable:
1905 failed_clock_set:
1906 clk_put(imx21->clk);
1907 failed_clock_get:
1908 iounmap(imx21->regs);
1909 failed_ioremap:
1910 release_mem_region(res->start, resource_size(res));
1911 failed_request_mem:
1912 remove_debug_files(imx21);
1913 usb_put_hcd(hcd);
1914 return ret;
1915 }
1916
1917 static struct platform_driver imx21_hcd_driver = {
1918 .driver = {
1919 .name = (char *)hcd_name,
1920 },
1921 .probe = imx21_probe,
1922 .remove = imx21_remove,
1923 .suspend = NULL,
1924 .resume = NULL,
1925 };
1926
1927 static int __init imx21_hcd_init(void)
1928 {
1929 return platform_driver_register(&imx21_hcd_driver);
1930 }
1931
1932 static void __exit imx21_hcd_cleanup(void)
1933 {
1934 platform_driver_unregister(&imx21_hcd_driver);
1935 }
1936
1937 module_init(imx21_hcd_init);
1938 module_exit(imx21_hcd_cleanup);
1939
1940 MODULE_DESCRIPTION("i.MX21 USB Host controller");
1941 MODULE_AUTHOR("Martin Fuzzey");
1942 MODULE_LICENSE("GPL");
1943 MODULE_ALIAS("platform:imx21-hcd");
kernel source for telekom puls (alcatel/mediatek)