?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
net: DCB: Validate DCB_ATTR_DCB_BUFFER argument
[linux/fpc-iii.git] / drivers / usb / host / imx21-hcd.c
blob5835f9966204626fbf5f29c769c233249a7b96bf
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * USB Host Controller Driver for IMX21
4 *
5 * Copyright (C) 2006 Loping Dog Embedded Systems
6 * Copyright (C) 2009 Martin Fuzzey
7 * Originally written by Jay Monkman <jtm@lopingdog.com>
8 * Ported to 2.6.30, debugged and enhanced by Martin Fuzzey
9 */
10
11
12 /*
13 * The i.MX21 USB hardware contains
14 * * 32 transfer descriptors (called ETDs)
15 * * 4Kb of Data memory
16 *
17 * The data memory is shared between the host and function controllers
18 * (but this driver only supports the host controller)
19 *
20 * So setting up a transfer involves:
21 * * Allocating a ETD
22 * * Fill in ETD with appropriate information
23 * * Allocating data memory (and putting the offset in the ETD)
24 * * Activate the ETD
25 * * Get interrupt when done.
26 *
27 * An ETD is assigned to each active endpoint.
28 *
29 * Low resource (ETD and Data memory) situations are handled differently for
30 * isochronous and non insosynchronous transactions :
31 *
32 * Non ISOC transfers are queued if either ETDs or Data memory are unavailable
33 *
34 * ISOC transfers use 2 ETDs per endpoint to achieve double buffering.
35 * They allocate both ETDs and Data memory during URB submission
36 * (and fail if unavailable).
37 */
38
39 #include <linux/clk.h>
40 #include <linux/io.h>
41 #include <linux/kernel.h>
42 #include <linux/list.h>
43 #include <linux/platform_device.h>
44 #include <linux/slab.h>
45 #include <linux/usb.h>
46 #include <linux/usb/hcd.h>
47 #include <linux/dma-mapping.h>
48 #include <linux/module.h>
49
50 #include "imx21-hcd.h"
51
52 #ifdef CONFIG_DYNAMIC_DEBUG
53 #define DEBUG
54 #endif
55
56 #ifdef DEBUG
57 #define DEBUG_LOG_FRAME(imx21, etd, event) \
58 (etd)->event##_frame = readl((imx21)->regs + USBH_FRMNUB)
59 #else
60 #define DEBUG_LOG_FRAME(imx21, etd, event) do { } while (0)
61 #endif
62
63 static const char hcd_name[] = "imx21-hcd";
64
65 static inline struct imx21 *hcd_to_imx21(struct usb_hcd *hcd)
66 {
67 return (struct imx21 *)hcd->hcd_priv;
68 }
69
70
71 /* =========================================== */
72 /* Hardware access helpers */
73 /* =========================================== */
74
75 static inline void set_register_bits(struct imx21 *imx21, u32 offset, u32 mask)
76 {
77 void __iomem *reg = imx21->regs + offset;
78 writel(readl(reg) | mask, reg);
79 }
80
81 static inline void clear_register_bits(struct imx21 *imx21,
82 u32 offset, u32 mask)
83 {
84 void __iomem *reg = imx21->regs + offset;
85 writel(readl(reg) & ~mask, reg);
86 }
87
88 static inline void clear_toggle_bit(struct imx21 *imx21, u32 offset, u32 mask)
89 {
90 void __iomem *reg = imx21->regs + offset;
91
92 if (readl(reg) & mask)
93 writel(mask, reg);
94 }
95
96 static inline void set_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 void etd_writel(struct imx21 *imx21, int etd_num, int dword, u32 value)
105 {
106 writel(value, imx21->regs + USB_ETD_DWORD(etd_num, dword));
107 }
108
109 static u32 etd_readl(struct imx21 *imx21, int etd_num, int dword)
110 {
111 return readl(imx21->regs + USB_ETD_DWORD(etd_num, dword));
112 }
113
114 static inline int wrap_frame(int counter)
115 {
116 return counter & 0xFFFF;
117 }
118
119 static inline int frame_after(int frame, int after)
120 {
121 /* handle wrapping like jiffies time_afer */
122 return (s16)((s16)after - (s16)frame) < 0;
123 }
124
125 static int imx21_hc_get_frame(struct usb_hcd *hcd)
126 {
127 struct imx21 *imx21 = hcd_to_imx21(hcd);
128
129 return wrap_frame(readl(imx21->regs + USBH_FRMNUB));
130 }
131
132 static inline bool unsuitable_for_dma(dma_addr_t addr)
133 {
134 return (addr & 3) != 0;
135 }
136
137 #include "imx21-dbg.c"
138
139 static void nonisoc_urb_completed_for_etd(
140 struct imx21 *imx21, struct etd_priv *etd, int status);
141 static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb);
142 static void free_dmem(struct imx21 *imx21, struct etd_priv *etd);
143
144 /* =========================================== */
145 /* ETD management */
146 /* =========================================== */
147
148 static int alloc_etd(struct imx21 *imx21)
149 {
150 int i;
151 struct etd_priv *etd = imx21->etd;
152
153 for (i = 0; i < USB_NUM_ETD; i++, etd++) {
154 if (etd->alloc == 0) {
155 memset(etd, 0, sizeof(imx21->etd[0]));
156 etd->alloc = 1;
157 debug_etd_allocated(imx21);
158 return i;
159 }
160 }
161 return -1;
162 }
163
164 static void disactivate_etd(struct imx21 *imx21, int num)
165 {
166 int etd_mask = (1 << num);
167 struct etd_priv *etd = &imx21->etd[num];
168
169 writel(etd_mask, imx21->regs + USBH_ETDENCLR);
170 clear_register_bits(imx21, USBH_ETDDONEEN, etd_mask);
171 writel(etd_mask, imx21->regs + USB_ETDDMACHANLCLR);
172 clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask);
173
174 etd->active_count = 0;
175
176 DEBUG_LOG_FRAME(imx21, etd, disactivated);
177 }
178
179 static void reset_etd(struct imx21 *imx21, int num)
180 {
181 struct etd_priv *etd = imx21->etd + num;
182 int i;
183
184 disactivate_etd(imx21, num);
185
186 for (i = 0; i < 4; i++)
187 etd_writel(imx21, num, i, 0);
188 etd->urb = NULL;
189 etd->ep = NULL;
190 etd->td = NULL;
191 etd->bounce_buffer = NULL;
192 }
193
194 static void free_etd(struct imx21 *imx21, int num)
195 {
196 if (num < 0)
197 return;
198
199 if (num >= USB_NUM_ETD) {
200 dev_err(imx21->dev, "BAD etd=%d!\n", num);
201 return;
202 }
203 if (imx21->etd[num].alloc == 0) {
204 dev_err(imx21->dev, "ETD %d already free!\n", num);
205 return;
206 }
207
208 debug_etd_freed(imx21);
209 reset_etd(imx21, num);
210 memset(&imx21->etd[num], 0, sizeof(imx21->etd[0]));
211 }
212
213
214 static void setup_etd_dword0(struct imx21 *imx21,
215 int etd_num, struct urb *urb, u8 dir, u16 maxpacket)
216 {
217 etd_writel(imx21, etd_num, 0,
218 ((u32) usb_pipedevice(urb->pipe)) << DW0_ADDRESS |
219 ((u32) usb_pipeendpoint(urb->pipe) << DW0_ENDPNT) |
220 ((u32) dir << DW0_DIRECT) |
221 ((u32) ((urb->dev->speed == USB_SPEED_LOW) ?
222 1 : 0) << DW0_SPEED) |
223 ((u32) fmt_urb_to_etd[usb_pipetype(urb->pipe)] << DW0_FORMAT) |
224 ((u32) maxpacket << DW0_MAXPKTSIZ));
225 }
226
227 /**
228 * Copy buffer to data controller data memory.
229 * We cannot use memcpy_toio() because the hardware requires 32bit writes
230 */
231 static void copy_to_dmem(
232 struct imx21 *imx21, int dmem_offset, void *src, int count)
233 {
234 void __iomem *dmem = imx21->regs + USBOTG_DMEM + dmem_offset;
235 u32 word = 0;
236 u8 *p = src;
237 int byte = 0;
238 int i;
239
240 for (i = 0; i < count; i++) {
241 byte = i % 4;
242 word += (*p++ << (byte * 8));
243 if (byte == 3) {
244 writel(word, dmem);
245 dmem += 4;
246 word = 0;
247 }
248 }
249
250 if (count && byte != 3)
251 writel(word, dmem);
252 }
253
254 static void activate_etd(struct imx21 *imx21, int etd_num, u8 dir)
255 {
256 u32 etd_mask = 1 << etd_num;
257 struct etd_priv *etd = &imx21->etd[etd_num];
258
259 if (etd->dma_handle && unsuitable_for_dma(etd->dma_handle)) {
260 /* For non aligned isoc the condition below is always true */
261 if (etd->len <= etd->dmem_size) {
262 /* Fits into data memory, use PIO */
263 if (dir != TD_DIR_IN) {
264 copy_to_dmem(imx21,
265 etd->dmem_offset,
266 etd->cpu_buffer, etd->len);
267 }
268 etd->dma_handle = 0;
269
270 } else {
271 /* Too big for data memory, use bounce buffer */
272 enum dma_data_direction dmadir;
273
274 if (dir == TD_DIR_IN) {
275 dmadir = DMA_FROM_DEVICE;
276 etd->bounce_buffer = kmalloc(etd->len,
277 GFP_ATOMIC);
278 } else {
279 dmadir = DMA_TO_DEVICE;
280 etd->bounce_buffer = kmemdup(etd->cpu_buffer,
281 etd->len,
282 GFP_ATOMIC);
283 }
284 if (!etd->bounce_buffer) {
285 dev_err(imx21->dev, "failed bounce alloc\n");
286 goto err_bounce_alloc;
287 }
288
289 etd->dma_handle =
290 dma_map_single(imx21->dev,
291 etd->bounce_buffer,
292 etd->len,
293 dmadir);
294 if (dma_mapping_error(imx21->dev, etd->dma_handle)) {
295 dev_err(imx21->dev, "failed bounce map\n");
296 goto err_bounce_map;
297 }
298 }
299 }
300
301 clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask);
302 set_register_bits(imx21, USBH_ETDDONEEN, etd_mask);
303 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
304 clear_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
305
306 if (etd->dma_handle) {
307 set_register_bits(imx21, USB_ETDDMACHANLCLR, etd_mask);
308 clear_toggle_bit(imx21, USBH_XBUFSTAT, etd_mask);
309 clear_toggle_bit(imx21, USBH_YBUFSTAT, etd_mask);
310 writel(etd->dma_handle, imx21->regs + USB_ETDSMSA(etd_num));
311 set_register_bits(imx21, USB_ETDDMAEN, etd_mask);
312 } else {
313 if (dir != TD_DIR_IN) {
314 /* need to set for ZLP and PIO */
315 set_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
316 set_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
317 }
318 }
319
320 DEBUG_LOG_FRAME(imx21, etd, activated);
321
322 #ifdef DEBUG
323 if (!etd->active_count) {
324 int i;
325 etd->activated_frame = readl(imx21->regs + USBH_FRMNUB);
326 etd->disactivated_frame = -1;
327 etd->last_int_frame = -1;
328 etd->last_req_frame = -1;
329
330 for (i = 0; i < 4; i++)
331 etd->submitted_dwords[i] = etd_readl(imx21, etd_num, i);
332 }
333 #endif
334
335 etd->active_count = 1;
336 writel(etd_mask, imx21->regs + USBH_ETDENSET);
337 return;
338
339 err_bounce_map:
340 kfree(etd->bounce_buffer);
341
342 err_bounce_alloc:
343 free_dmem(imx21, etd);
344 nonisoc_urb_completed_for_etd(imx21, etd, -ENOMEM);
345 }
346
347 /* =========================================== */
348 /* Data memory management */
349 /* =========================================== */
350
351 static int alloc_dmem(struct imx21 *imx21, unsigned int size,
352 struct usb_host_endpoint *ep)
353 {
354 unsigned int offset = 0;
355 struct imx21_dmem_area *area;
356 struct imx21_dmem_area *tmp;
357
358 size += (~size + 1) & 0x3; /* Round to 4 byte multiple */
359
360 if (size > DMEM_SIZE) {
361 dev_err(imx21->dev, "size=%d > DMEM_SIZE(%d)\n",
362 size, DMEM_SIZE);
363 return -EINVAL;
364 }
365
366 list_for_each_entry(tmp, &imx21->dmem_list, list) {
367 if ((size + offset) < offset)
368 goto fail;
369 if ((size + offset) <= tmp->offset)
370 break;
371 offset = tmp->size + tmp->offset;
372 if ((offset + size) > DMEM_SIZE)
373 goto fail;
374 }
375
376 area = kmalloc(sizeof(struct imx21_dmem_area), GFP_ATOMIC);
377 if (area == NULL)
378 return -ENOMEM;
379
380 area->ep = ep;
381 area->offset = offset;
382 area->size = size;
383 list_add_tail(&area->list, &tmp->list);
384 debug_dmem_allocated(imx21, size);
385 return offset;
386
387 fail:
388 return -ENOMEM;
389 }
390
391 /* Memory now available for a queued ETD - activate it */
392 static void activate_queued_etd(struct imx21 *imx21,
393 struct etd_priv *etd, u32 dmem_offset)
394 {
395 struct urb_priv *urb_priv = etd->urb->hcpriv;
396 int etd_num = etd - &imx21->etd[0];
397 u32 maxpacket = etd_readl(imx21, etd_num, 1) >> DW1_YBUFSRTAD;
398 u8 dir = (etd_readl(imx21, etd_num, 2) >> DW2_DIRPID) & 0x03;
399
400 dev_dbg(imx21->dev, "activating queued ETD %d now DMEM available\n",
401 etd_num);
402 etd_writel(imx21, etd_num, 1,
403 ((dmem_offset + maxpacket) << DW1_YBUFSRTAD) | dmem_offset);
404
405 etd->dmem_offset = dmem_offset;
406 urb_priv->active = 1;
407 activate_etd(imx21, etd_num, dir);
408 }
409
410 static void free_dmem(struct imx21 *imx21, struct etd_priv *etd)
411 {
412 struct imx21_dmem_area *area;
413 struct etd_priv *tmp;
414 int found = 0;
415 int offset;
416
417 if (!etd->dmem_size)
418 return;
419 etd->dmem_size = 0;
420
421 offset = etd->dmem_offset;
422 list_for_each_entry(area, &imx21->dmem_list, list) {
423 if (area->offset == offset) {
424 debug_dmem_freed(imx21, area->size);
425 list_del(&area->list);
426 kfree(area);
427 found = 1;
428 break;
429 }
430 }
431
432 if (!found) {
433 dev_err(imx21->dev,
434 "Trying to free unallocated DMEM %d\n", offset);
435 return;
436 }
437
438 /* Try again to allocate memory for anything we've queued */
439 list_for_each_entry_safe(etd, tmp, &imx21->queue_for_dmem, queue) {
440 offset = alloc_dmem(imx21, etd->dmem_size, etd->ep);
441 if (offset >= 0) {
442 list_del(&etd->queue);
443 activate_queued_etd(imx21, etd, (u32)offset);
444 }
445 }
446 }
447
448 static void free_epdmem(struct imx21 *imx21, struct usb_host_endpoint *ep)
449 {
450 struct imx21_dmem_area *area, *tmp;
451
452 list_for_each_entry_safe(area, tmp, &imx21->dmem_list, list) {
453 if (area->ep == ep) {
454 dev_err(imx21->dev,
455 "Active DMEM %d for disabled ep=%p\n",
456 area->offset, ep);
457 list_del(&area->list);
458 kfree(area);
459 }
460 }
461 }
462
463
464 /* =========================================== */
465 /* End handling */
466 /* =========================================== */
467
468 /* Endpoint now idle - release its ETD(s) or assign to queued request */
469 static void ep_idle(struct imx21 *imx21, struct ep_priv *ep_priv)
470 {
471 int i;
472
473 for (i = 0; i < NUM_ISO_ETDS; i++) {
474 int etd_num = ep_priv->etd[i];
475 struct etd_priv *etd;
476 if (etd_num < 0)
477 continue;
478
479 etd = &imx21->etd[etd_num];
480 ep_priv->etd[i] = -1;
481
482 free_dmem(imx21, etd); /* for isoc */
483
484 if (list_empty(&imx21->queue_for_etd)) {
485 free_etd(imx21, etd_num);
486 continue;
487 }
488
489 dev_dbg(imx21->dev,
490 "assigning idle etd %d for queued request\n", etd_num);
491 ep_priv = list_first_entry(&imx21->queue_for_etd,
492 struct ep_priv, queue);
493 list_del(&ep_priv->queue);
494 reset_etd(imx21, etd_num);
495 ep_priv->waiting_etd = 0;
496 ep_priv->etd[i] = etd_num;
497
498 if (list_empty(&ep_priv->ep->urb_list)) {
499 dev_err(imx21->dev, "No urb for queued ep!\n");
500 continue;
501 }
502 schedule_nonisoc_etd(imx21, list_first_entry(
503 &ep_priv->ep->urb_list, struct urb, urb_list));
504 }
505 }
506
507 static void urb_done(struct usb_hcd *hcd, struct urb *urb, int status)
508 __releases(imx21->lock)
509 __acquires(imx21->lock)
510 {
511 struct imx21 *imx21 = hcd_to_imx21(hcd);
512 struct ep_priv *ep_priv = urb->ep->hcpriv;
513 struct urb_priv *urb_priv = urb->hcpriv;
514
515 debug_urb_completed(imx21, urb, status);
516 dev_vdbg(imx21->dev, "urb %p done %d\n", urb, status);
517
518 kfree(urb_priv->isoc_td);
519 kfree(urb->hcpriv);
520 urb->hcpriv = NULL;
521 usb_hcd_unlink_urb_from_ep(hcd, urb);
522 spin_unlock(&imx21->lock);
523 usb_hcd_giveback_urb(hcd, urb, status);
524 spin_lock(&imx21->lock);
525 if (list_empty(&ep_priv->ep->urb_list))
526 ep_idle(imx21, ep_priv);
527 }
528
529 static void nonisoc_urb_completed_for_etd(
530 struct imx21 *imx21, struct etd_priv *etd, int status)
531 {
532 struct usb_host_endpoint *ep = etd->ep;
533
534 urb_done(imx21->hcd, etd->urb, status);
535 etd->urb = NULL;
536
537 if (!list_empty(&ep->urb_list)) {
538 struct urb *urb = list_first_entry(
539 &ep->urb_list, struct urb, urb_list);
540
541 dev_vdbg(imx21->dev, "next URB %p\n", urb);
542 schedule_nonisoc_etd(imx21, urb);
543 }
544 }
545
546
547 /* =========================================== */
548 /* ISOC Handling ... */
549 /* =========================================== */
550
551 static void schedule_isoc_etds(struct usb_hcd *hcd,
552 struct usb_host_endpoint *ep)
553 {
554 struct imx21 *imx21 = hcd_to_imx21(hcd);
555 struct ep_priv *ep_priv = ep->hcpriv;
556 struct etd_priv *etd;
557 struct urb_priv *urb_priv;
558 struct td *td;
559 int etd_num;
560 int i;
561 int cur_frame;
562 u8 dir;
563
564 for (i = 0; i < NUM_ISO_ETDS; i++) {
565 too_late:
566 if (list_empty(&ep_priv->td_list))
567 break;
568
569 etd_num = ep_priv->etd[i];
570 if (etd_num < 0)
571 break;
572
573 etd = &imx21->etd[etd_num];
574 if (etd->urb)
575 continue;
576
577 td = list_entry(ep_priv->td_list.next, struct td, list);
578 list_del(&td->list);
579 urb_priv = td->urb->hcpriv;
580
581 cur_frame = imx21_hc_get_frame(hcd);
582 if (frame_after(cur_frame, td->frame)) {
583 dev_dbg(imx21->dev, "isoc too late frame %d > %d\n",
584 cur_frame, td->frame);
585 urb_priv->isoc_status = -EXDEV;
586 td->urb->iso_frame_desc[
587 td->isoc_index].actual_length = 0;
588 td->urb->iso_frame_desc[td->isoc_index].status = -EXDEV;
589 if (--urb_priv->isoc_remaining == 0)
590 urb_done(hcd, td->urb, urb_priv->isoc_status);
591 goto too_late;
592 }
593
594 urb_priv->active = 1;
595 etd->td = td;
596 etd->ep = td->ep;
597 etd->urb = td->urb;
598 etd->len = td->len;
599 etd->dma_handle = td->dma_handle;
600 etd->cpu_buffer = td->cpu_buffer;
601
602 debug_isoc_submitted(imx21, cur_frame, td);
603
604 dir = usb_pipeout(td->urb->pipe) ? TD_DIR_OUT : TD_DIR_IN;
605 setup_etd_dword0(imx21, etd_num, td->urb, dir, etd->dmem_size);
606 etd_writel(imx21, etd_num, 1, etd->dmem_offset);
607 etd_writel(imx21, etd_num, 2,
608 (TD_NOTACCESSED << DW2_COMPCODE) |
609 ((td->frame & 0xFFFF) << DW2_STARTFRM));
610 etd_writel(imx21, etd_num, 3,
611 (TD_NOTACCESSED << DW3_COMPCODE0) |
612 (td->len << DW3_PKTLEN0));
613
614 activate_etd(imx21, etd_num, dir);
615 }
616 }
617
618 static void isoc_etd_done(struct usb_hcd *hcd, int etd_num)
619 {
620 struct imx21 *imx21 = hcd_to_imx21(hcd);
621 int etd_mask = 1 << etd_num;
622 struct etd_priv *etd = imx21->etd + etd_num;
623 struct urb *urb = etd->urb;
624 struct urb_priv *urb_priv = urb->hcpriv;
625 struct td *td = etd->td;
626 struct usb_host_endpoint *ep = etd->ep;
627 int isoc_index = td->isoc_index;
628 unsigned int pipe = urb->pipe;
629 int dir_in = usb_pipein(pipe);
630 int cc;
631 int bytes_xfrd;
632
633 disactivate_etd(imx21, etd_num);
634
635 cc = (etd_readl(imx21, etd_num, 3) >> DW3_COMPCODE0) & 0xf;
636 bytes_xfrd = etd_readl(imx21, etd_num, 3) & 0x3ff;
637
638 /* Input doesn't always fill the buffer, don't generate an error
639 * when this happens.
640 */
641 if (dir_in && (cc == TD_DATAUNDERRUN))
642 cc = TD_CC_NOERROR;
643
644 if (cc == TD_NOTACCESSED)
645 bytes_xfrd = 0;
646
647 debug_isoc_completed(imx21,
648 imx21_hc_get_frame(hcd), td, cc, bytes_xfrd);
649 if (cc) {
650 urb_priv->isoc_status = -EXDEV;
651 dev_dbg(imx21->dev,
652 "bad iso cc=0x%X frame=%d sched frame=%d "
653 "cnt=%d len=%d urb=%p etd=%d index=%d\n",
654 cc, imx21_hc_get_frame(hcd), td->frame,
655 bytes_xfrd, td->len, urb, etd_num, isoc_index);
656 }
657
658 if (dir_in) {
659 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
660 if (!etd->dma_handle)
661 memcpy_fromio(etd->cpu_buffer,
662 imx21->regs + USBOTG_DMEM + etd->dmem_offset,
663 bytes_xfrd);
664 }
665
666 urb->actual_length += bytes_xfrd;
667 urb->iso_frame_desc[isoc_index].actual_length = bytes_xfrd;
668 urb->iso_frame_desc[isoc_index].status = cc_to_error[cc];
669
670 etd->td = NULL;
671 etd->urb = NULL;
672 etd->ep = NULL;
673
674 if (--urb_priv->isoc_remaining == 0)
675 urb_done(hcd, urb, urb_priv->isoc_status);
676
677 schedule_isoc_etds(hcd, ep);
678 }
679
680 static struct ep_priv *alloc_isoc_ep(
681 struct imx21 *imx21, struct usb_host_endpoint *ep)
682 {
683 struct ep_priv *ep_priv;
684 int i;
685
686 ep_priv = kzalloc(sizeof(struct ep_priv), GFP_ATOMIC);
687 if (!ep_priv)
688 return NULL;
689
690 for (i = 0; i < NUM_ISO_ETDS; i++)
691 ep_priv->etd[i] = -1;
692
693 INIT_LIST_HEAD(&ep_priv->td_list);
694 ep_priv->ep = ep;
695 ep->hcpriv = ep_priv;
696 return ep_priv;
697 }
698
699 static int alloc_isoc_etds(struct imx21 *imx21, struct ep_priv *ep_priv)
700 {
701 int i, j;
702 int etd_num;
703
704 /* Allocate the ETDs if required */
705 for (i = 0; i < NUM_ISO_ETDS; i++) {
706 if (ep_priv->etd[i] < 0) {
707 etd_num = alloc_etd(imx21);
708 if (etd_num < 0)
709 goto alloc_etd_failed;
710
711 ep_priv->etd[i] = etd_num;
712 imx21->etd[etd_num].ep = ep_priv->ep;
713 }
714 }
715 return 0;
716
717 alloc_etd_failed:
718 dev_err(imx21->dev, "isoc: Couldn't allocate etd\n");
719 for (j = 0; j < i; j++) {
720 free_etd(imx21, ep_priv->etd[j]);
721 ep_priv->etd[j] = -1;
722 }
723 return -ENOMEM;
724 }
725
726 static int imx21_hc_urb_enqueue_isoc(struct usb_hcd *hcd,
727 struct usb_host_endpoint *ep,
728 struct urb *urb, gfp_t mem_flags)
729 {
730 struct imx21 *imx21 = hcd_to_imx21(hcd);
731 struct urb_priv *urb_priv;
732 unsigned long flags;
733 struct ep_priv *ep_priv;
734 struct td *td = NULL;
735 int i;
736 int ret;
737 int cur_frame;
738 u16 maxpacket;
739
740 urb_priv = kzalloc(sizeof(struct urb_priv), mem_flags);
741 if (urb_priv == NULL)
742 return -ENOMEM;
743
744 urb_priv->isoc_td = kcalloc(urb->number_of_packets, sizeof(struct td),
745 mem_flags);
746 if (urb_priv->isoc_td == NULL) {
747 ret = -ENOMEM;
748 goto alloc_td_failed;
749 }
750
751 spin_lock_irqsave(&imx21->lock, flags);
752
753 if (ep->hcpriv == NULL) {
754 ep_priv = alloc_isoc_ep(imx21, ep);
755 if (ep_priv == NULL) {
756 ret = -ENOMEM;
757 goto alloc_ep_failed;
758 }
759 } else {
760 ep_priv = ep->hcpriv;
761 }
762
763 ret = alloc_isoc_etds(imx21, ep_priv);
764 if (ret)
765 goto alloc_etd_failed;
766
767 ret = usb_hcd_link_urb_to_ep(hcd, urb);
768 if (ret)
769 goto link_failed;
770
771 urb->status = -EINPROGRESS;
772 urb->actual_length = 0;
773 urb->error_count = 0;
774 urb->hcpriv = urb_priv;
775 urb_priv->ep = ep;
776
777 /* allocate data memory for largest packets if not already done */
778 maxpacket = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
779 for (i = 0; i < NUM_ISO_ETDS; i++) {
780 struct etd_priv *etd = &imx21->etd[ep_priv->etd[i]];
781
782 if (etd->dmem_size > 0 && etd->dmem_size < maxpacket) {
783 /* not sure if this can really occur.... */
784 dev_err(imx21->dev, "increasing isoc buffer %d->%d\n",
785 etd->dmem_size, maxpacket);
786 ret = -EMSGSIZE;
787 goto alloc_dmem_failed;
788 }
789
790 if (etd->dmem_size == 0) {
791 etd->dmem_offset = alloc_dmem(imx21, maxpacket, ep);
792 if (etd->dmem_offset < 0) {
793 dev_dbg(imx21->dev, "failed alloc isoc dmem\n");
794 ret = -EAGAIN;
795 goto alloc_dmem_failed;
796 }
797 etd->dmem_size = maxpacket;
798 }
799 }
800
801 /* calculate frame */
802 cur_frame = imx21_hc_get_frame(hcd);
803 i = 0;
804 if (list_empty(&ep_priv->td_list)) {
805 urb->start_frame = wrap_frame(cur_frame + 5);
806 } else {
807 urb->start_frame = wrap_frame(list_entry(ep_priv->td_list.prev,
808 struct td, list)->frame + urb->interval);
809
810 if (frame_after(cur_frame, urb->start_frame)) {
811 dev_dbg(imx21->dev,
812 "enqueue: adjusting iso start %d (cur=%d) asap=%d\n",
813 urb->start_frame, cur_frame,
814 (urb->transfer_flags & URB_ISO_ASAP) != 0);
815 i = DIV_ROUND_UP(wrap_frame(
816 cur_frame - urb->start_frame),
817 urb->interval);
818
819 /* Treat underruns as if URB_ISO_ASAP was set */
820 if ((urb->transfer_flags & URB_ISO_ASAP) ||
821 i >= urb->number_of_packets) {
822 urb->start_frame = wrap_frame(urb->start_frame
823 + i * urb->interval);
824 i = 0;
825 }
826 }
827 }
828
829 /* set up transfers */
830 urb_priv->isoc_remaining = urb->number_of_packets - i;
831 td = urb_priv->isoc_td;
832 for (; i < urb->number_of_packets; i++, td++) {
833 unsigned int offset = urb->iso_frame_desc[i].offset;
834 td->ep = ep;
835 td->urb = urb;
836 td->len = urb->iso_frame_desc[i].length;
837 td->isoc_index = i;
838 td->frame = wrap_frame(urb->start_frame + urb->interval * i);
839 td->dma_handle = urb->transfer_dma + offset;
840 td->cpu_buffer = urb->transfer_buffer + offset;
841 list_add_tail(&td->list, &ep_priv->td_list);
842 }
843
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=%pad setupBuf=%p setupDma=%pad\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 = USB_DT_HUB; /* 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 HUB_CHAR_NO_LPSM | /* No power switching */
1473 HUB_CHAR_NO_OCPM); /* No over current protection */
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 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 const 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_DMA | 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_unprepare(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 irq;
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 = dev_get_platdata(&pdev->dev);
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_prepare_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, 0);
1895 if (ret != 0) {
1896 dev_err(imx21->dev, "usb_add_hcd() returned %d\n", ret);
1897 goto failed_add_hcd;
1898 }
1899 device_wakeup_enable(hcd->self.controller);
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 = 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");
Linux with added FPC-III support