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1/*
2 * USB Host Controller Driver for IMX21
3 *
4 * Copyright (C) 2006 Loping Dog Embedded Systems
5 * Copyright (C) 2009 Martin Fuzzey
6 * Originally written by Jay Monkman <jtm@lopingdog.com>
7 * Ported to 2.6.30, debugged and enhanced by Martin Fuzzey
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 * for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24
25 /*
26 * The i.MX21 USB hardware contains
27 * * 32 transfer descriptors (called ETDs)
28 * * 4Kb of Data memory
29 *
30 * The data memory is shared between the host and function controllers
31 * (but this driver only supports the host controller)
32 *
33 * So setting up a transfer involves:
34 * * Allocating a ETD
35 * * Fill in ETD with appropriate information
36 * * Allocating data memory (and putting the offset in the ETD)
37 * * Activate the ETD
38 * * Get interrupt when done.
39 *
40 * An ETD is assigned to each active endpoint.
41 *
42 * Low resource (ETD and Data memory) situations are handled differently for
43 * isochronous and non insosynchronous transactions :
44 *
45 * Non ISOC transfers are queued if either ETDs or Data memory are unavailable
46 *
47 * ISOC transfers use 2 ETDs per endpoint to achieve double buffering.
48 * They allocate both ETDs and Data memory during URB submission
49 * (and fail if unavailable).
50 */
51
52#include <linux/clk.h>
53#include <linux/io.h>
54#include <linux/kernel.h>
55#include <linux/list.h>
56#include <linux/platform_device.h>
57#include <linux/slab.h>
58#include <linux/usb.h>
59#include <linux/usb/hcd.h>
60#include <linux/dma-mapping.h>
61#include <linux/module.h>
62
63#include "imx21-hcd.h"
64
65#ifdef CONFIG_DYNAMIC_DEBUG
66#define DEBUG
67#endif
68
69#ifdef DEBUG
70#define DEBUG_LOG_FRAME(imx21, etd, event) \
71 (etd)->event##_frame = readl((imx21)->regs + USBH_FRMNUB)
72#else
73#define DEBUG_LOG_FRAME(imx21, etd, event) do { } while (0)
74#endif
75
76static const char hcd_name[] = "imx21-hcd";
77
78static inline struct imx21 *hcd_to_imx21(struct usb_hcd *hcd)
79{
80 return (struct imx21 *)hcd->hcd_priv;
81}
82
83
84/* =========================================== */
85/* Hardware access helpers */
86/* =========================================== */
87
88static inline void set_register_bits(struct imx21 *imx21, u32 offset, u32 mask)
89{
90 void __iomem *reg = imx21->regs + offset;
91 writel(readl(reg) | mask, reg);
92}
93
94static inline void clear_register_bits(struct imx21 *imx21,
95 u32 offset, u32 mask)
96{
97 void __iomem *reg = imx21->regs + offset;
98 writel(readl(reg) & ~mask, reg);
99}
100
101static inline void clear_toggle_bit(struct imx21 *imx21, u32 offset, u32 mask)
102{
103 void __iomem *reg = imx21->regs + offset;
104
105 if (readl(reg) & mask)
106 writel(mask, reg);
107}
108
109static inline void set_toggle_bit(struct imx21 *imx21, u32 offset, u32 mask)
110{
111 void __iomem *reg = imx21->regs + offset;
112
113 if (!(readl(reg) & mask))
114 writel(mask, reg);
115}
116
117static void etd_writel(struct imx21 *imx21, int etd_num, int dword, u32 value)
118{
119 writel(value, imx21->regs + USB_ETD_DWORD(etd_num, dword));
120}
121
122static u32 etd_readl(struct imx21 *imx21, int etd_num, int dword)
123{
124 return readl(imx21->regs + USB_ETD_DWORD(etd_num, dword));
125}
126
127static inline int wrap_frame(int counter)
128{
129 return counter & 0xFFFF;
130}
131
132static inline int frame_after(int frame, int after)
133{
134 /* handle wrapping like jiffies time_afer */
135 return (s16)((s16)after - (s16)frame) < 0;
136}
137
138static int imx21_hc_get_frame(struct usb_hcd *hcd)
139{
140 struct imx21 *imx21 = hcd_to_imx21(hcd);
141
142 return wrap_frame(readl(imx21->regs + USBH_FRMNUB));
143}
144
145static inline bool unsuitable_for_dma(dma_addr_t addr)
146{
147 return (addr & 3) != 0;
148}
149
150#include "imx21-dbg.c"
151
152static void nonisoc_urb_completed_for_etd(
153 struct imx21 *imx21, struct etd_priv *etd, int status);
154static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb);
155static void free_dmem(struct imx21 *imx21, struct etd_priv *etd);
156
157/* =========================================== */
158/* ETD management */
159/* =========================================== */
160
161static int alloc_etd(struct imx21 *imx21)
162{
163 int i;
164 struct etd_priv *etd = imx21->etd;
165
166 for (i = 0; i < USB_NUM_ETD; i++, etd++) {
167 if (etd->alloc == 0) {
168 memset(etd, 0, sizeof(imx21->etd[0]));
169 etd->alloc = 1;
170 debug_etd_allocated(imx21);
171 return i;
172 }
173 }
174 return -1;
175}
176
177static void disactivate_etd(struct imx21 *imx21, int num)
178{
179 int etd_mask = (1 << num);
180 struct etd_priv *etd = &imx21->etd[num];
181
182 writel(etd_mask, imx21->regs + USBH_ETDENCLR);
183 clear_register_bits(imx21, USBH_ETDDONEEN, etd_mask);
184 writel(etd_mask, imx21->regs + USB_ETDDMACHANLCLR);
185 clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask);
186
187 etd->active_count = 0;
188
189 DEBUG_LOG_FRAME(imx21, etd, disactivated);
190}
191
192static void reset_etd(struct imx21 *imx21, int num)
193{
194 struct etd_priv *etd = imx21->etd + num;
195 int i;
196
197 disactivate_etd(imx21, num);
198
199 for (i = 0; i < 4; i++)
200 etd_writel(imx21, num, i, 0);
201 etd->urb = NULL;
202 etd->ep = NULL;
203 etd->td = NULL;
204 etd->bounce_buffer = NULL;
205}
206
207static void free_etd(struct imx21 *imx21, int num)
208{
209 if (num < 0)
210 return;
211
212 if (num >= USB_NUM_ETD) {
213 dev_err(imx21->dev, "BAD etd=%d!\n", num);
214 return;
215 }
216 if (imx21->etd[num].alloc == 0) {
217 dev_err(imx21->dev, "ETD %d already free!\n", num);
218 return;
219 }
220
221 debug_etd_freed(imx21);
222 reset_etd(imx21, num);
223 memset(&imx21->etd[num], 0, sizeof(imx21->etd[0]));
224}
225
226
227static void setup_etd_dword0(struct imx21 *imx21,
228 int etd_num, struct urb *urb, u8 dir, u16 maxpacket)
229{
230 etd_writel(imx21, etd_num, 0,
231 ((u32) usb_pipedevice(urb->pipe)) << DW0_ADDRESS |
232 ((u32) usb_pipeendpoint(urb->pipe) << DW0_ENDPNT) |
233 ((u32) dir << DW0_DIRECT) |
234 ((u32) ((urb->dev->speed == USB_SPEED_LOW) ?
235 1 : 0) << DW0_SPEED) |
236 ((u32) fmt_urb_to_etd[usb_pipetype(urb->pipe)] << DW0_FORMAT) |
237 ((u32) maxpacket << DW0_MAXPKTSIZ));
238}
239
240/**
241 * Copy buffer to data controller data memory.
242 * We cannot use memcpy_toio() because the hardware requires 32bit writes
243 */
244static void copy_to_dmem(
245 struct imx21 *imx21, int dmem_offset, void *src, int count)
246{
247 void __iomem *dmem = imx21->regs + USBOTG_DMEM + dmem_offset;
248 u32 word = 0;
249 u8 *p = src;
250 int byte = 0;
251 int i;
252
253 for (i = 0; i < count; i++) {
254 byte = i % 4;
255 word += (*p++ << (byte * 8));
256 if (byte == 3) {
257 writel(word, dmem);
258 dmem += 4;
259 word = 0;
260 }
261 }
262
263 if (count && byte != 3)
264 writel(word, dmem);
265}
266
267static void activate_etd(struct imx21 *imx21, int etd_num, u8 dir)
268{
269 u32 etd_mask = 1 << etd_num;
270 struct etd_priv *etd = &imx21->etd[etd_num];
271
272 if (etd->dma_handle && unsuitable_for_dma(etd->dma_handle)) {
273 /* For non aligned isoc the condition below is always true */
274 if (etd->len <= etd->dmem_size) {
275 /* Fits into data memory, use PIO */
276 if (dir != TD_DIR_IN) {
277 copy_to_dmem(imx21,
278 etd->dmem_offset,
279 etd->cpu_buffer, etd->len);
280 }
281 etd->dma_handle = 0;
282
283 } else {
284 /* Too big for data memory, use bounce buffer */
285 enum dma_data_direction dmadir;
286
287 if (dir == TD_DIR_IN) {
288 dmadir = DMA_FROM_DEVICE;
289 etd->bounce_buffer = kmalloc(etd->len,
290 GFP_ATOMIC);
291 } else {
292 dmadir = DMA_TO_DEVICE;
293 etd->bounce_buffer = kmemdup(etd->cpu_buffer,
294 etd->len,
295 GFP_ATOMIC);
296 }
297 if (!etd->bounce_buffer) {
298 dev_err(imx21->dev, "failed bounce alloc\n");
299 goto err_bounce_alloc;
300 }
301
302 etd->dma_handle =
303 dma_map_single(imx21->dev,
304 etd->bounce_buffer,
305 etd->len,
306 dmadir);
307 if (dma_mapping_error(imx21->dev, etd->dma_handle)) {
308 dev_err(imx21->dev, "failed bounce map\n");
309 goto err_bounce_map;
310 }
311 }
312 }
313
314 clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask);
315 set_register_bits(imx21, USBH_ETDDONEEN, etd_mask);
316 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
317 clear_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
318
319 if (etd->dma_handle) {
320 set_register_bits(imx21, USB_ETDDMACHANLCLR, etd_mask);
321 clear_toggle_bit(imx21, USBH_XBUFSTAT, etd_mask);
322 clear_toggle_bit(imx21, USBH_YBUFSTAT, etd_mask);
323 writel(etd->dma_handle, imx21->regs + USB_ETDSMSA(etd_num));
324 set_register_bits(imx21, USB_ETDDMAEN, etd_mask);
325 } else {
326 if (dir != TD_DIR_IN) {
327 /* need to set for ZLP and PIO */
328 set_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
329 set_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
330 }
331 }
332
333 DEBUG_LOG_FRAME(imx21, etd, activated);
334
335#ifdef DEBUG
336 if (!etd->active_count) {
337 int i;
338 etd->activated_frame = readl(imx21->regs + USBH_FRMNUB);
339 etd->disactivated_frame = -1;
340 etd->last_int_frame = -1;
341 etd->last_req_frame = -1;
342
343 for (i = 0; i < 4; i++)
344 etd->submitted_dwords[i] = etd_readl(imx21, etd_num, i);
345 }
346#endif
347
348 etd->active_count = 1;
349 writel(etd_mask, imx21->regs + USBH_ETDENSET);
350 return;
351
352err_bounce_map:
353 kfree(etd->bounce_buffer);
354
355err_bounce_alloc:
356 free_dmem(imx21, etd);
357 nonisoc_urb_completed_for_etd(imx21, etd, -ENOMEM);
358}
359
360/* =========================================== */
361/* Data memory management */
362/* =========================================== */
363
364static int alloc_dmem(struct imx21 *imx21, unsigned int size,
365 struct usb_host_endpoint *ep)
366{
367 unsigned int offset = 0;
368 struct imx21_dmem_area *area;
369 struct imx21_dmem_area *tmp;
370
371 size += (~size + 1) & 0x3; /* Round to 4 byte multiple */
372
373 if (size > DMEM_SIZE) {
374 dev_err(imx21->dev, "size=%d > DMEM_SIZE(%d)\n",
375 size, DMEM_SIZE);
376 return -EINVAL;
377 }
378
379 list_for_each_entry(tmp, &imx21->dmem_list, list) {
380 if ((size + offset) < offset)
381 goto fail;
382 if ((size + offset) <= tmp->offset)
383 break;
384 offset = tmp->size + tmp->offset;
385 if ((offset + size) > DMEM_SIZE)
386 goto fail;
387 }
388
389 area = kmalloc(sizeof(struct imx21_dmem_area), GFP_ATOMIC);
390 if (area == NULL)
391 return -ENOMEM;
392
393 area->ep = ep;
394 area->offset = offset;
395 area->size = size;
396 list_add_tail(&area->list, &tmp->list);
397 debug_dmem_allocated(imx21, size);
398 return offset;
399
400fail:
401 return -ENOMEM;
402}
403
404/* Memory now available for a queued ETD - activate it */
405static void activate_queued_etd(struct imx21 *imx21,
406 struct etd_priv *etd, u32 dmem_offset)
407{
408 struct urb_priv *urb_priv = etd->urb->hcpriv;
409 int etd_num = etd - &imx21->etd[0];
410 u32 maxpacket = etd_readl(imx21, etd_num, 1) >> DW1_YBUFSRTAD;
411 u8 dir = (etd_readl(imx21, etd_num, 2) >> DW2_DIRPID) & 0x03;
412
413 dev_dbg(imx21->dev, "activating queued ETD %d now DMEM available\n",
414 etd_num);
415 etd_writel(imx21, etd_num, 1,
416 ((dmem_offset + maxpacket) << DW1_YBUFSRTAD) | dmem_offset);
417
418 etd->dmem_offset = dmem_offset;
419 urb_priv->active = 1;
420 activate_etd(imx21, etd_num, dir);
421}
422
423static void free_dmem(struct imx21 *imx21, struct etd_priv *etd)
424{
425 struct imx21_dmem_area *area;
426 struct etd_priv *tmp;
427 int found = 0;
428 int offset;
429
430 if (!etd->dmem_size)
431 return;
432 etd->dmem_size = 0;
433
434 offset = etd->dmem_offset;
435 list_for_each_entry(area, &imx21->dmem_list, list) {
436 if (area->offset == offset) {
437 debug_dmem_freed(imx21, area->size);
438 list_del(&area->list);
439 kfree(area);
440 found = 1;
441 break;
442 }
443 }
444
445 if (!found) {
446 dev_err(imx21->dev,
447 "Trying to free unallocated DMEM %d\n", offset);
448 return;
449 }
450
451 /* Try again to allocate memory for anything we've queued */
452 list_for_each_entry_safe(etd, tmp, &imx21->queue_for_dmem, queue) {
453 offset = alloc_dmem(imx21, etd->dmem_size, etd->ep);
454 if (offset >= 0) {
455 list_del(&etd->queue);
456 activate_queued_etd(imx21, etd, (u32)offset);
457 }
458 }
459}
460
461static void free_epdmem(struct imx21 *imx21, struct usb_host_endpoint *ep)
462{
463 struct imx21_dmem_area *area, *tmp;
464
465 list_for_each_entry_safe(area, tmp, &imx21->dmem_list, list) {
466 if (area->ep == ep) {
467 dev_err(imx21->dev,
468 "Active DMEM %d for disabled ep=%p\n",
469 area->offset, ep);
470 list_del(&area->list);
471 kfree(area);
472 }
473 }
474}
475
476
477/* =========================================== */
478/* End handling */
479/* =========================================== */
480
481/* Endpoint now idle - release its ETD(s) or assign to queued request */
482static void ep_idle(struct imx21 *imx21, struct ep_priv *ep_priv)
483{
484 int i;
485
486 for (i = 0; i < NUM_ISO_ETDS; i++) {
487 int etd_num = ep_priv->etd[i];
488 struct etd_priv *etd;
489 if (etd_num < 0)
490 continue;
491
492 etd = &imx21->etd[etd_num];
493 ep_priv->etd[i] = -1;
494
495 free_dmem(imx21, etd); /* for isoc */
496
497 if (list_empty(&imx21->queue_for_etd)) {
498 free_etd(imx21, etd_num);
499 continue;
500 }
501
502 dev_dbg(imx21->dev,
503 "assigning idle etd %d for queued request\n", etd_num);
504 ep_priv = list_first_entry(&imx21->queue_for_etd,
505 struct ep_priv, queue);
506 list_del(&ep_priv->queue);
507 reset_etd(imx21, etd_num);
508 ep_priv->waiting_etd = 0;
509 ep_priv->etd[i] = etd_num;
510
511 if (list_empty(&ep_priv->ep->urb_list)) {
512 dev_err(imx21->dev, "No urb for queued ep!\n");
513 continue;
514 }
515 schedule_nonisoc_etd(imx21, list_first_entry(
516 &ep_priv->ep->urb_list, struct urb, urb_list));
517 }
518}
519
520static void urb_done(struct usb_hcd *hcd, struct urb *urb, int status)
521__releases(imx21->lock)
522__acquires(imx21->lock)
523{
524 struct imx21 *imx21 = hcd_to_imx21(hcd);
525 struct ep_priv *ep_priv = urb->ep->hcpriv;
526 struct urb_priv *urb_priv = urb->hcpriv;
527
528 debug_urb_completed(imx21, urb, status);
529 dev_vdbg(imx21->dev, "urb %p done %d\n", urb, status);
530
531 kfree(urb_priv->isoc_td);
532 kfree(urb->hcpriv);
533 urb->hcpriv = NULL;
534 usb_hcd_unlink_urb_from_ep(hcd, urb);
535 spin_unlock(&imx21->lock);
536 usb_hcd_giveback_urb(hcd, urb, status);
537 spin_lock(&imx21->lock);
538 if (list_empty(&ep_priv->ep->urb_list))
539 ep_idle(imx21, ep_priv);
540}
541
542static void nonisoc_urb_completed_for_etd(
543 struct imx21 *imx21, struct etd_priv *etd, int status)
544{
545 struct usb_host_endpoint *ep = etd->ep;
546
547 urb_done(imx21->hcd, etd->urb, status);
548 etd->urb = NULL;
549
550 if (!list_empty(&ep->urb_list)) {
551 struct urb *urb = list_first_entry(
552 &ep->urb_list, struct urb, urb_list);
553
554 dev_vdbg(imx21->dev, "next URB %p\n", urb);
555 schedule_nonisoc_etd(imx21, urb);
556 }
557}
558
559
560/* =========================================== */
561/* ISOC Handling ... */
562/* =========================================== */
563
564static void schedule_isoc_etds(struct usb_hcd *hcd,
565 struct usb_host_endpoint *ep)
566{
567 struct imx21 *imx21 = hcd_to_imx21(hcd);
568 struct ep_priv *ep_priv = ep->hcpriv;
569 struct etd_priv *etd;
570 struct urb_priv *urb_priv;
571 struct td *td;
572 int etd_num;
573 int i;
574 int cur_frame;
575 u8 dir;
576
577 for (i = 0; i < NUM_ISO_ETDS; i++) {
578too_late:
579 if (list_empty(&ep_priv->td_list))
580 break;
581
582 etd_num = ep_priv->etd[i];
583 if (etd_num < 0)
584 break;
585
586 etd = &imx21->etd[etd_num];
587 if (etd->urb)
588 continue;
589
590 td = list_entry(ep_priv->td_list.next, struct td, list);
591 list_del(&td->list);
592 urb_priv = td->urb->hcpriv;
593
594 cur_frame = imx21_hc_get_frame(hcd);
595 if (frame_after(cur_frame, td->frame)) {
596 dev_dbg(imx21->dev, "isoc too late frame %d > %d\n",
597 cur_frame, td->frame);
598 urb_priv->isoc_status = -EXDEV;
599 td->urb->iso_frame_desc[
600 td->isoc_index].actual_length = 0;
601 td->urb->iso_frame_desc[td->isoc_index].status = -EXDEV;
602 if (--urb_priv->isoc_remaining == 0)
603 urb_done(hcd, td->urb, urb_priv->isoc_status);
604 goto too_late;
605 }
606
607 urb_priv->active = 1;
608 etd->td = td;
609 etd->ep = td->ep;
610 etd->urb = td->urb;
611 etd->len = td->len;
612 etd->dma_handle = td->dma_handle;
613 etd->cpu_buffer = td->cpu_buffer;
614
615 debug_isoc_submitted(imx21, cur_frame, td);
616
617 dir = usb_pipeout(td->urb->pipe) ? TD_DIR_OUT : TD_DIR_IN;
618 setup_etd_dword0(imx21, etd_num, td->urb, dir, etd->dmem_size);
619 etd_writel(imx21, etd_num, 1, etd->dmem_offset);
620 etd_writel(imx21, etd_num, 2,
621 (TD_NOTACCESSED << DW2_COMPCODE) |
622 ((td->frame & 0xFFFF) << DW2_STARTFRM));
623 etd_writel(imx21, etd_num, 3,
624 (TD_NOTACCESSED << DW3_COMPCODE0) |
625 (td->len << DW3_PKTLEN0));
626
627 activate_etd(imx21, etd_num, dir);
628 }
629}
630
631static void isoc_etd_done(struct usb_hcd *hcd, int etd_num)
632{
633 struct imx21 *imx21 = hcd_to_imx21(hcd);
634 int etd_mask = 1 << etd_num;
635 struct etd_priv *etd = imx21->etd + etd_num;
636 struct urb *urb = etd->urb;
637 struct urb_priv *urb_priv = urb->hcpriv;
638 struct td *td = etd->td;
639 struct usb_host_endpoint *ep = etd->ep;
640 int isoc_index = td->isoc_index;
641 unsigned int pipe = urb->pipe;
642 int dir_in = usb_pipein(pipe);
643 int cc;
644 int bytes_xfrd;
645
646 disactivate_etd(imx21, etd_num);
647
648 cc = (etd_readl(imx21, etd_num, 3) >> DW3_COMPCODE0) & 0xf;
649 bytes_xfrd = etd_readl(imx21, etd_num, 3) & 0x3ff;
650
651 /* Input doesn't always fill the buffer, don't generate an error
652 * when this happens.
653 */
654 if (dir_in && (cc == TD_DATAUNDERRUN))
655 cc = TD_CC_NOERROR;
656
657 if (cc == TD_NOTACCESSED)
658 bytes_xfrd = 0;
659
660 debug_isoc_completed(imx21,
661 imx21_hc_get_frame(hcd), td, cc, bytes_xfrd);
662 if (cc) {
663 urb_priv->isoc_status = -EXDEV;
664 dev_dbg(imx21->dev,
665 "bad iso cc=0x%X frame=%d sched frame=%d "
666 "cnt=%d len=%d urb=%p etd=%d index=%d\n",
667 cc, imx21_hc_get_frame(hcd), td->frame,
668 bytes_xfrd, td->len, urb, etd_num, isoc_index);
669 }
670
671 if (dir_in) {
672 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
673 if (!etd->dma_handle)
674 memcpy_fromio(etd->cpu_buffer,
675 imx21->regs + USBOTG_DMEM + etd->dmem_offset,
676 bytes_xfrd);
677 }
678
679 urb->actual_length += bytes_xfrd;
680 urb->iso_frame_desc[isoc_index].actual_length = bytes_xfrd;
681 urb->iso_frame_desc[isoc_index].status = cc_to_error[cc];
682
683 etd->td = NULL;
684 etd->urb = NULL;
685 etd->ep = NULL;
686
687 if (--urb_priv->isoc_remaining == 0)
688 urb_done(hcd, urb, urb_priv->isoc_status);
689
690 schedule_isoc_etds(hcd, ep);
691}
692
693static struct ep_priv *alloc_isoc_ep(
694 struct imx21 *imx21, struct usb_host_endpoint *ep)
695{
696 struct ep_priv *ep_priv;
697 int i;
698
699 ep_priv = kzalloc(sizeof(struct ep_priv), GFP_ATOMIC);
700 if (!ep_priv)
701 return NULL;
702
703 for (i = 0; i < NUM_ISO_ETDS; i++)
704 ep_priv->etd[i] = -1;
705
706 INIT_LIST_HEAD(&ep_priv->td_list);
707 ep_priv->ep = ep;
708 ep->hcpriv = ep_priv;
709 return ep_priv;
710}
711
712static int alloc_isoc_etds(struct imx21 *imx21, struct ep_priv *ep_priv)
713{
714 int i, j;
715 int etd_num;
716
717 /* Allocate the ETDs if required */
718 for (i = 0; i < NUM_ISO_ETDS; i++) {
719 if (ep_priv->etd[i] < 0) {
720 etd_num = alloc_etd(imx21);
721 if (etd_num < 0)
722 goto alloc_etd_failed;
723
724 ep_priv->etd[i] = etd_num;
725 imx21->etd[etd_num].ep = ep_priv->ep;
726 }
727 }
728 return 0;
729
730alloc_etd_failed:
731 dev_err(imx21->dev, "isoc: Couldn't allocate etd\n");
732 for (j = 0; j < i; j++) {
733 free_etd(imx21, ep_priv->etd[j]);
734 ep_priv->etd[j] = -1;
735 }
736 return -ENOMEM;
737}
738
739static int imx21_hc_urb_enqueue_isoc(struct usb_hcd *hcd,
740 struct usb_host_endpoint *ep,
741 struct urb *urb, gfp_t mem_flags)
742{
743 struct imx21 *imx21 = hcd_to_imx21(hcd);
744 struct urb_priv *urb_priv;
745 unsigned long flags;
746 struct ep_priv *ep_priv;
747 struct td *td = NULL;
748 int i;
749 int ret;
750 int cur_frame;
751 u16 maxpacket;
752
753 urb_priv = kzalloc(sizeof(struct urb_priv), mem_flags);
754 if (urb_priv == NULL)
755 return -ENOMEM;
756
757 urb_priv->isoc_td = kzalloc(
758 sizeof(struct td) * urb->number_of_packets, mem_flags);
759 if (urb_priv->isoc_td == NULL) {
760 ret = -ENOMEM;
761 goto alloc_td_failed;
762 }
763
764 spin_lock_irqsave(&imx21->lock, flags);
765
766 if (ep->hcpriv == NULL) {
767 ep_priv = alloc_isoc_ep(imx21, ep);
768 if (ep_priv == NULL) {
769 ret = -ENOMEM;
770 goto alloc_ep_failed;
771 }
772 } else {
773 ep_priv = ep->hcpriv;
774 }
775
776 ret = alloc_isoc_etds(imx21, ep_priv);
777 if (ret)
778 goto alloc_etd_failed;
779
780 ret = usb_hcd_link_urb_to_ep(hcd, urb);
781 if (ret)
782 goto link_failed;
783
784 urb->status = -EINPROGRESS;
785 urb->actual_length = 0;
786 urb->error_count = 0;
787 urb->hcpriv = urb_priv;
788 urb_priv->ep = ep;
789
790 /* allocate data memory for largest packets if not already done */
791 maxpacket = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
792 for (i = 0; i < NUM_ISO_ETDS; i++) {
793 struct etd_priv *etd = &imx21->etd[ep_priv->etd[i]];
794
795 if (etd->dmem_size > 0 && etd->dmem_size < maxpacket) {
796 /* not sure if this can really occur.... */
797 dev_err(imx21->dev, "increasing isoc buffer %d->%d\n",
798 etd->dmem_size, maxpacket);
799 ret = -EMSGSIZE;
800 goto alloc_dmem_failed;
801 }
802
803 if (etd->dmem_size == 0) {
804 etd->dmem_offset = alloc_dmem(imx21, maxpacket, ep);
805 if (etd->dmem_offset < 0) {
806 dev_dbg(imx21->dev, "failed alloc isoc dmem\n");
807 ret = -EAGAIN;
808 goto alloc_dmem_failed;
809 }
810 etd->dmem_size = maxpacket;
811 }
812 }
813
814 /* calculate frame */
815 cur_frame = imx21_hc_get_frame(hcd);
816 i = 0;
817 if (list_empty(&ep_priv->td_list)) {
818 urb->start_frame = wrap_frame(cur_frame + 5);
819 } else {
820 urb->start_frame = wrap_frame(list_entry(ep_priv->td_list.prev,
821 struct td, list)->frame + urb->interval);
822
823 if (frame_after(cur_frame, urb->start_frame)) {
824 dev_dbg(imx21->dev,
825 "enqueue: adjusting iso start %d (cur=%d) asap=%d\n",
826 urb->start_frame, cur_frame,
827 (urb->transfer_flags & URB_ISO_ASAP) != 0);
828 i = DIV_ROUND_UP(wrap_frame(
829 cur_frame - urb->start_frame),
830 urb->interval);
831
832 /* Treat underruns as if URB_ISO_ASAP was set */
833 if ((urb->transfer_flags & URB_ISO_ASAP) ||
834 i >= urb->number_of_packets) {
835 urb->start_frame = wrap_frame(urb->start_frame
836 + i * urb->interval);
837 i = 0;
838 }
839 }
840 }
841
842 /* set up transfers */
843 urb_priv->isoc_remaining = urb->number_of_packets - i;
844 td = urb_priv->isoc_td;
845 for (; i < urb->number_of_packets; i++, td++) {
846 unsigned int offset = urb->iso_frame_desc[i].offset;
847 td->ep = ep;
848 td->urb = urb;
849 td->len = urb->iso_frame_desc[i].length;
850 td->isoc_index = i;
851 td->frame = wrap_frame(urb->start_frame + urb->interval * i);
852 td->dma_handle = urb->transfer_dma + offset;
853 td->cpu_buffer = urb->transfer_buffer + offset;
854 list_add_tail(&td->list, &ep_priv->td_list);
855 }
856
857 dev_vdbg(imx21->dev, "setup %d packets for iso frame %d->%d\n",
858 urb->number_of_packets, urb->start_frame, td->frame);
859
860 debug_urb_submitted(imx21, urb);
861 schedule_isoc_etds(hcd, ep);
862
863 spin_unlock_irqrestore(&imx21->lock, flags);
864 return 0;
865
866alloc_dmem_failed:
867 usb_hcd_unlink_urb_from_ep(hcd, urb);
868
869link_failed:
870alloc_etd_failed:
871alloc_ep_failed:
872 spin_unlock_irqrestore(&imx21->lock, flags);
873 kfree(urb_priv->isoc_td);
874
875alloc_td_failed:
876 kfree(urb_priv);
877 return ret;
878}
879
880static void dequeue_isoc_urb(struct imx21 *imx21,
881 struct urb *urb, struct ep_priv *ep_priv)
882{
883 struct urb_priv *urb_priv = urb->hcpriv;
884 struct td *td, *tmp;
885 int i;
886
887 if (urb_priv->active) {
888 for (i = 0; i < NUM_ISO_ETDS; i++) {
889 int etd_num = ep_priv->etd[i];
890 if (etd_num != -1 && imx21->etd[etd_num].urb == urb) {
891 struct etd_priv *etd = imx21->etd + etd_num;
892
893 reset_etd(imx21, etd_num);
894 free_dmem(imx21, etd);
895 }
896 }
897 }
898
899 list_for_each_entry_safe(td, tmp, &ep_priv->td_list, list) {
900 if (td->urb == urb) {
901 dev_vdbg(imx21->dev, "removing td %p\n", td);
902 list_del(&td->list);
903 }
904 }
905}
906
907/* =========================================== */
908/* NON ISOC Handling ... */
909/* =========================================== */
910
911static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb)
912{
913 unsigned int pipe = urb->pipe;
914 struct urb_priv *urb_priv = urb->hcpriv;
915 struct ep_priv *ep_priv = urb_priv->ep->hcpriv;
916 int state = urb_priv->state;
917 int etd_num = ep_priv->etd[0];
918 struct etd_priv *etd;
919 u32 count;
920 u16 etd_buf_size;
921 u16 maxpacket;
922 u8 dir;
923 u8 bufround;
924 u8 datatoggle;
925 u8 interval = 0;
926 u8 relpolpos = 0;
927
928 if (etd_num < 0) {
929 dev_err(imx21->dev, "No valid ETD\n");
930 return;
931 }
932 if (readl(imx21->regs + USBH_ETDENSET) & (1 << etd_num))
933 dev_err(imx21->dev, "submitting to active ETD %d\n", etd_num);
934
935 etd = &imx21->etd[etd_num];
936 maxpacket = usb_maxpacket(urb->dev, pipe, usb_pipeout(pipe));
937 if (!maxpacket)
938 maxpacket = 8;
939
940 if (usb_pipecontrol(pipe) && (state != US_CTRL_DATA)) {
941 if (state == US_CTRL_SETUP) {
942 dir = TD_DIR_SETUP;
943 if (unsuitable_for_dma(urb->setup_dma))
944 usb_hcd_unmap_urb_setup_for_dma(imx21->hcd,
945 urb);
946 etd->dma_handle = urb->setup_dma;
947 etd->cpu_buffer = urb->setup_packet;
948 bufround = 0;
949 count = 8;
950 datatoggle = TD_TOGGLE_DATA0;
951 } else { /* US_CTRL_ACK */
952 dir = usb_pipeout(pipe) ? TD_DIR_IN : TD_DIR_OUT;
953 bufround = 0;
954 count = 0;
955 datatoggle = TD_TOGGLE_DATA1;
956 }
957 } else {
958 dir = usb_pipeout(pipe) ? TD_DIR_OUT : TD_DIR_IN;
959 bufround = (dir == TD_DIR_IN) ? 1 : 0;
960 if (unsuitable_for_dma(urb->transfer_dma))
961 usb_hcd_unmap_urb_for_dma(imx21->hcd, urb);
962
963 etd->dma_handle = urb->transfer_dma;
964 etd->cpu_buffer = urb->transfer_buffer;
965 if (usb_pipebulk(pipe) && (state == US_BULK0))
966 count = 0;
967 else
968 count = urb->transfer_buffer_length;
969
970 if (usb_pipecontrol(pipe)) {
971 datatoggle = TD_TOGGLE_DATA1;
972 } else {
973 if (usb_gettoggle(
974 urb->dev,
975 usb_pipeendpoint(urb->pipe),
976 usb_pipeout(urb->pipe)))
977 datatoggle = TD_TOGGLE_DATA1;
978 else
979 datatoggle = TD_TOGGLE_DATA0;
980 }
981 }
982
983 etd->urb = urb;
984 etd->ep = urb_priv->ep;
985 etd->len = count;
986
987 if (usb_pipeint(pipe)) {
988 interval = urb->interval;
989 relpolpos = (readl(imx21->regs + USBH_FRMNUB) + 1) & 0xff;
990 }
991
992 /* Write ETD to device memory */
993 setup_etd_dword0(imx21, etd_num, urb, dir, maxpacket);
994
995 etd_writel(imx21, etd_num, 2,
996 (u32) interval << DW2_POLINTERV |
997 ((u32) relpolpos << DW2_RELPOLPOS) |
998 ((u32) dir << DW2_DIRPID) |
999 ((u32) bufround << DW2_BUFROUND) |
1000 ((u32) datatoggle << DW2_DATATOG) |
1001 ((u32) TD_NOTACCESSED << DW2_COMPCODE));
1002
1003 /* DMA will always transfer buffer size even if TOBYCNT in DWORD3
1004 is smaller. Make sure we don't overrun the buffer!
1005 */
1006 if (count && count < maxpacket)
1007 etd_buf_size = count;
1008 else
1009 etd_buf_size = maxpacket;
1010
1011 etd_writel(imx21, etd_num, 3,
1012 ((u32) (etd_buf_size - 1) << DW3_BUFSIZE) | (u32) count);
1013
1014 if (!count)
1015 etd->dma_handle = 0;
1016
1017 /* allocate x and y buffer space at once */
1018 etd->dmem_size = (count > maxpacket) ? maxpacket * 2 : maxpacket;
1019 etd->dmem_offset = alloc_dmem(imx21, etd->dmem_size, urb_priv->ep);
1020 if (etd->dmem_offset < 0) {
1021 /* Setup everything we can in HW and update when we get DMEM */
1022 etd_writel(imx21, etd_num, 1, (u32)maxpacket << 16);
1023
1024 dev_dbg(imx21->dev, "Queuing etd %d for DMEM\n", etd_num);
1025 debug_urb_queued_for_dmem(imx21, urb);
1026 list_add_tail(&etd->queue, &imx21->queue_for_dmem);
1027 return;
1028 }
1029
1030 etd_writel(imx21, etd_num, 1,
1031 (((u32) etd->dmem_offset + (u32) maxpacket) << DW1_YBUFSRTAD) |
1032 (u32) etd->dmem_offset);
1033
1034 urb_priv->active = 1;
1035
1036 /* enable the ETD to kick off transfer */
1037 dev_vdbg(imx21->dev, "Activating etd %d for %d bytes %s\n",
1038 etd_num, count, dir != TD_DIR_IN ? "out" : "in");
1039 activate_etd(imx21, etd_num, dir);
1040
1041}
1042
1043static void nonisoc_etd_done(struct usb_hcd *hcd, int etd_num)
1044{
1045 struct imx21 *imx21 = hcd_to_imx21(hcd);
1046 struct etd_priv *etd = &imx21->etd[etd_num];
1047 struct urb *urb = etd->urb;
1048 u32 etd_mask = 1 << etd_num;
1049 struct urb_priv *urb_priv = urb->hcpriv;
1050 int dir;
1051 int cc;
1052 u32 bytes_xfrd;
1053 int etd_done;
1054
1055 disactivate_etd(imx21, etd_num);
1056
1057 dir = (etd_readl(imx21, etd_num, 0) >> DW0_DIRECT) & 0x3;
1058 cc = (etd_readl(imx21, etd_num, 2) >> DW2_COMPCODE) & 0xf;
1059 bytes_xfrd = etd->len - (etd_readl(imx21, etd_num, 3) & 0x1fffff);
1060
1061 /* save toggle carry */
1062 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
1063 usb_pipeout(urb->pipe),
1064 (etd_readl(imx21, etd_num, 0) >> DW0_TOGCRY) & 0x1);
1065
1066 if (dir == TD_DIR_IN) {
1067 clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask);
1068 clear_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask);
1069
1070 if (etd->bounce_buffer) {
1071 memcpy(etd->cpu_buffer, etd->bounce_buffer, bytes_xfrd);
1072 dma_unmap_single(imx21->dev,
1073 etd->dma_handle, etd->len, DMA_FROM_DEVICE);
1074 } else if (!etd->dma_handle && bytes_xfrd) {/* PIO */
1075 memcpy_fromio(etd->cpu_buffer,
1076 imx21->regs + USBOTG_DMEM + etd->dmem_offset,
1077 bytes_xfrd);
1078 }
1079 }
1080
1081 kfree(etd->bounce_buffer);
1082 etd->bounce_buffer = NULL;
1083 free_dmem(imx21, etd);
1084
1085 urb->error_count = 0;
1086 if (!(urb->transfer_flags & URB_SHORT_NOT_OK)
1087 && (cc == TD_DATAUNDERRUN))
1088 cc = TD_CC_NOERROR;
1089
1090 if (cc != 0)
1091 dev_vdbg(imx21->dev, "cc is 0x%x\n", cc);
1092
1093 etd_done = (cc_to_error[cc] != 0); /* stop if error */
1094
1095 switch (usb_pipetype(urb->pipe)) {
1096 case PIPE_CONTROL:
1097 switch (urb_priv->state) {
1098 case US_CTRL_SETUP:
1099 if (urb->transfer_buffer_length > 0)
1100 urb_priv->state = US_CTRL_DATA;
1101 else
1102 urb_priv->state = US_CTRL_ACK;
1103 break;
1104 case US_CTRL_DATA:
1105 urb->actual_length += bytes_xfrd;
1106 urb_priv->state = US_CTRL_ACK;
1107 break;
1108 case US_CTRL_ACK:
1109 etd_done = 1;
1110 break;
1111 default:
1112 dev_err(imx21->dev,
1113 "Invalid pipe state %d\n", urb_priv->state);
1114 etd_done = 1;
1115 break;
1116 }
1117 break;
1118
1119 case PIPE_BULK:
1120 urb->actual_length += bytes_xfrd;
1121 if ((urb_priv->state == US_BULK)
1122 && (urb->transfer_flags & URB_ZERO_PACKET)
1123 && urb->transfer_buffer_length > 0
1124 && ((urb->transfer_buffer_length %
1125 usb_maxpacket(urb->dev, urb->pipe,
1126 usb_pipeout(urb->pipe))) == 0)) {
1127 /* need a 0-packet */
1128 urb_priv->state = US_BULK0;
1129 } else {
1130 etd_done = 1;
1131 }
1132 break;
1133
1134 case PIPE_INTERRUPT:
1135 urb->actual_length += bytes_xfrd;
1136 etd_done = 1;
1137 break;
1138 }
1139
1140 if (etd_done)
1141 nonisoc_urb_completed_for_etd(imx21, etd, cc_to_error[cc]);
1142 else {
1143 dev_vdbg(imx21->dev, "next state=%d\n", urb_priv->state);
1144 schedule_nonisoc_etd(imx21, urb);
1145 }
1146}
1147
1148
1149static struct ep_priv *alloc_ep(void)
1150{
1151 int i;
1152 struct ep_priv *ep_priv;
1153
1154 ep_priv = kzalloc(sizeof(struct ep_priv), GFP_ATOMIC);
1155 if (!ep_priv)
1156 return NULL;
1157
1158 for (i = 0; i < NUM_ISO_ETDS; ++i)
1159 ep_priv->etd[i] = -1;
1160
1161 return ep_priv;
1162}
1163
1164static int imx21_hc_urb_enqueue(struct usb_hcd *hcd,
1165 struct urb *urb, gfp_t mem_flags)
1166{
1167 struct imx21 *imx21 = hcd_to_imx21(hcd);
1168 struct usb_host_endpoint *ep = urb->ep;
1169 struct urb_priv *urb_priv;
1170 struct ep_priv *ep_priv;
1171 struct etd_priv *etd;
1172 int ret;
1173 unsigned long flags;
1174
1175 dev_vdbg(imx21->dev,
1176 "enqueue urb=%p ep=%p len=%d "
1177 "buffer=%p dma=%pad setupBuf=%p setupDma=%pad\n",
1178 urb, ep,
1179 urb->transfer_buffer_length,
1180 urb->transfer_buffer, &urb->transfer_dma,
1181 urb->setup_packet, &urb->setup_dma);
1182
1183 if (usb_pipeisoc(urb->pipe))
1184 return imx21_hc_urb_enqueue_isoc(hcd, ep, urb, mem_flags);
1185
1186 urb_priv = kzalloc(sizeof(struct urb_priv), mem_flags);
1187 if (!urb_priv)
1188 return -ENOMEM;
1189
1190 spin_lock_irqsave(&imx21->lock, flags);
1191
1192 ep_priv = ep->hcpriv;
1193 if (ep_priv == NULL) {
1194 ep_priv = alloc_ep();
1195 if (!ep_priv) {
1196 ret = -ENOMEM;
1197 goto failed_alloc_ep;
1198 }
1199 ep->hcpriv = ep_priv;
1200 ep_priv->ep = ep;
1201 }
1202
1203 ret = usb_hcd_link_urb_to_ep(hcd, urb);
1204 if (ret)
1205 goto failed_link;
1206
1207 urb->status = -EINPROGRESS;
1208 urb->actual_length = 0;
1209 urb->error_count = 0;
1210 urb->hcpriv = urb_priv;
1211 urb_priv->ep = ep;
1212
1213 switch (usb_pipetype(urb->pipe)) {
1214 case PIPE_CONTROL:
1215 urb_priv->state = US_CTRL_SETUP;
1216 break;
1217 case PIPE_BULK:
1218 urb_priv->state = US_BULK;
1219 break;
1220 }
1221
1222 debug_urb_submitted(imx21, urb);
1223 if (ep_priv->etd[0] < 0) {
1224 if (ep_priv->waiting_etd) {
1225 dev_dbg(imx21->dev,
1226 "no ETD available already queued %p\n",
1227 ep_priv);
1228 debug_urb_queued_for_etd(imx21, urb);
1229 goto out;
1230 }
1231 ep_priv->etd[0] = alloc_etd(imx21);
1232 if (ep_priv->etd[0] < 0) {
1233 dev_dbg(imx21->dev,
1234 "no ETD available queueing %p\n", ep_priv);
1235 debug_urb_queued_for_etd(imx21, urb);
1236 list_add_tail(&ep_priv->queue, &imx21->queue_for_etd);
1237 ep_priv->waiting_etd = 1;
1238 goto out;
1239 }
1240 }
1241
1242 /* Schedule if no URB already active for this endpoint */
1243 etd = &imx21->etd[ep_priv->etd[0]];
1244 if (etd->urb == NULL) {
1245 DEBUG_LOG_FRAME(imx21, etd, last_req);
1246 schedule_nonisoc_etd(imx21, urb);
1247 }
1248
1249out:
1250 spin_unlock_irqrestore(&imx21->lock, flags);
1251 return 0;
1252
1253failed_link:
1254failed_alloc_ep:
1255 spin_unlock_irqrestore(&imx21->lock, flags);
1256 kfree(urb_priv);
1257 return ret;
1258}
1259
1260static int imx21_hc_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
1261 int status)
1262{
1263 struct imx21 *imx21 = hcd_to_imx21(hcd);
1264 unsigned long flags;
1265 struct usb_host_endpoint *ep;
1266 struct ep_priv *ep_priv;
1267 struct urb_priv *urb_priv = urb->hcpriv;
1268 int ret = -EINVAL;
1269
1270 dev_vdbg(imx21->dev, "dequeue urb=%p iso=%d status=%d\n",
1271 urb, usb_pipeisoc(urb->pipe), status);
1272
1273 spin_lock_irqsave(&imx21->lock, flags);
1274
1275 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
1276 if (ret)
1277 goto fail;
1278 ep = urb_priv->ep;
1279 ep_priv = ep->hcpriv;
1280
1281 debug_urb_unlinked(imx21, urb);
1282
1283 if (usb_pipeisoc(urb->pipe)) {
1284 dequeue_isoc_urb(imx21, urb, ep_priv);
1285 schedule_isoc_etds(hcd, ep);
1286 } else if (urb_priv->active) {
1287 int etd_num = ep_priv->etd[0];
1288 if (etd_num != -1) {
1289 struct etd_priv *etd = &imx21->etd[etd_num];
1290
1291 disactivate_etd(imx21, etd_num);
1292 free_dmem(imx21, etd);
1293 etd->urb = NULL;
1294 kfree(etd->bounce_buffer);
1295 etd->bounce_buffer = NULL;
1296 }
1297 }
1298
1299 urb_done(hcd, urb, status);
1300
1301 spin_unlock_irqrestore(&imx21->lock, flags);
1302 return 0;
1303
1304fail:
1305 spin_unlock_irqrestore(&imx21->lock, flags);
1306 return ret;
1307}
1308
1309/* =========================================== */
1310/* Interrupt dispatch */
1311/* =========================================== */
1312
1313static void process_etds(struct usb_hcd *hcd, struct imx21 *imx21, int sof)
1314{
1315 int etd_num;
1316 int enable_sof_int = 0;
1317 unsigned long flags;
1318
1319 spin_lock_irqsave(&imx21->lock, flags);
1320
1321 for (etd_num = 0; etd_num < USB_NUM_ETD; etd_num++) {
1322 u32 etd_mask = 1 << etd_num;
1323 u32 enabled = readl(imx21->regs + USBH_ETDENSET) & etd_mask;
1324 u32 done = readl(imx21->regs + USBH_ETDDONESTAT) & etd_mask;
1325 struct etd_priv *etd = &imx21->etd[etd_num];
1326
1327
1328 if (done) {
1329 DEBUG_LOG_FRAME(imx21, etd, last_int);
1330 } else {
1331/*
1332 * Kludge warning!
1333 *
1334 * When multiple transfers are using the bus we sometimes get into a state
1335 * where the transfer has completed (the CC field of the ETD is != 0x0F),
1336 * the ETD has self disabled but the ETDDONESTAT flag is not set
1337 * (and hence no interrupt occurs).
1338 * This causes the transfer in question to hang.
1339 * The kludge below checks for this condition at each SOF and processes any
1340 * blocked ETDs (after an arbitrary 10 frame wait)
1341 *
1342 * With a single active transfer the usbtest test suite will run for days
1343 * without the kludge.
1344 * With other bus activity (eg mass storage) even just test1 will hang without
1345 * the kludge.
1346 */
1347 u32 dword0;
1348 int cc;
1349
1350 if (etd->active_count && !enabled) /* suspicious... */
1351 enable_sof_int = 1;
1352
1353 if (!sof || enabled || !etd->active_count)
1354 continue;
1355
1356 cc = etd_readl(imx21, etd_num, 2) >> DW2_COMPCODE;
1357 if (cc == TD_NOTACCESSED)
1358 continue;
1359
1360 if (++etd->active_count < 10)
1361 continue;
1362
1363 dword0 = etd_readl(imx21, etd_num, 0);
1364 dev_dbg(imx21->dev,
1365 "unblock ETD %d dev=0x%X ep=0x%X cc=0x%02X!\n",
1366 etd_num, dword0 & 0x7F,
1367 (dword0 >> DW0_ENDPNT) & 0x0F,
1368 cc);
1369
1370#ifdef DEBUG
1371 dev_dbg(imx21->dev,
1372 "frame: act=%d disact=%d"
1373 " int=%d req=%d cur=%d\n",
1374 etd->activated_frame,
1375 etd->disactivated_frame,
1376 etd->last_int_frame,
1377 etd->last_req_frame,
1378 readl(imx21->regs + USBH_FRMNUB));
1379 imx21->debug_unblocks++;
1380#endif
1381 etd->active_count = 0;
1382/* End of kludge */
1383 }
1384
1385 if (etd->ep == NULL || etd->urb == NULL) {
1386 dev_dbg(imx21->dev,
1387 "Interrupt for unexpected etd %d"
1388 " ep=%p urb=%p\n",
1389 etd_num, etd->ep, etd->urb);
1390 disactivate_etd(imx21, etd_num);
1391 continue;
1392 }
1393
1394 if (usb_pipeisoc(etd->urb->pipe))
1395 isoc_etd_done(hcd, etd_num);
1396 else
1397 nonisoc_etd_done(hcd, etd_num);
1398 }
1399
1400 /* only enable SOF interrupt if it may be needed for the kludge */
1401 if (enable_sof_int)
1402 set_register_bits(imx21, USBH_SYSIEN, USBH_SYSIEN_SOFINT);
1403 else
1404 clear_register_bits(imx21, USBH_SYSIEN, USBH_SYSIEN_SOFINT);
1405
1406
1407 spin_unlock_irqrestore(&imx21->lock, flags);
1408}
1409
1410static irqreturn_t imx21_irq(struct usb_hcd *hcd)
1411{
1412 struct imx21 *imx21 = hcd_to_imx21(hcd);
1413 u32 ints = readl(imx21->regs + USBH_SYSISR);
1414
1415 if (ints & USBH_SYSIEN_HERRINT)
1416 dev_dbg(imx21->dev, "Scheduling error\n");
1417
1418 if (ints & USBH_SYSIEN_SORINT)
1419 dev_dbg(imx21->dev, "Scheduling overrun\n");
1420
1421 if (ints & (USBH_SYSISR_DONEINT | USBH_SYSISR_SOFINT))
1422 process_etds(hcd, imx21, ints & USBH_SYSISR_SOFINT);
1423
1424 writel(ints, imx21->regs + USBH_SYSISR);
1425 return IRQ_HANDLED;
1426}
1427
1428static void imx21_hc_endpoint_disable(struct usb_hcd *hcd,
1429 struct usb_host_endpoint *ep)
1430{
1431 struct imx21 *imx21 = hcd_to_imx21(hcd);
1432 unsigned long flags;
1433 struct ep_priv *ep_priv;
1434 int i;
1435
1436 if (ep == NULL)
1437 return;
1438
1439 spin_lock_irqsave(&imx21->lock, flags);
1440 ep_priv = ep->hcpriv;
1441 dev_vdbg(imx21->dev, "disable ep=%p, ep->hcpriv=%p\n", ep, ep_priv);
1442
1443 if (!list_empty(&ep->urb_list))
1444 dev_dbg(imx21->dev, "ep's URB list is not empty\n");
1445
1446 if (ep_priv != NULL) {
1447 for (i = 0; i < NUM_ISO_ETDS; i++) {
1448 if (ep_priv->etd[i] > -1)
1449 dev_dbg(imx21->dev, "free etd %d for disable\n",
1450 ep_priv->etd[i]);
1451
1452 free_etd(imx21, ep_priv->etd[i]);
1453 }
1454 kfree(ep_priv);
1455 ep->hcpriv = NULL;
1456 }
1457
1458 for (i = 0; i < USB_NUM_ETD; i++) {
1459 if (imx21->etd[i].alloc && imx21->etd[i].ep == ep) {
1460 dev_err(imx21->dev,
1461 "Active etd %d for disabled ep=%p!\n", i, ep);
1462 free_etd(imx21, i);
1463 }
1464 }
1465 free_epdmem(imx21, ep);
1466 spin_unlock_irqrestore(&imx21->lock, flags);
1467}
1468
1469/* =========================================== */
1470/* Hub handling */
1471/* =========================================== */
1472
1473static int get_hub_descriptor(struct usb_hcd *hcd,
1474 struct usb_hub_descriptor *desc)
1475{
1476 struct imx21 *imx21 = hcd_to_imx21(hcd);
1477 desc->bDescriptorType = USB_DT_HUB; /* HUB descriptor */
1478 desc->bHubContrCurrent = 0;
1479
1480 desc->bNbrPorts = readl(imx21->regs + USBH_ROOTHUBA)
1481 & USBH_ROOTHUBA_NDNSTMPRT_MASK;
1482 desc->bDescLength = 9;
1483 desc->bPwrOn2PwrGood = 0;
1484 desc->wHubCharacteristics = (__force __u16) cpu_to_le16(
1485 HUB_CHAR_NO_LPSM | /* No power switching */
1486 HUB_CHAR_NO_OCPM); /* No over current protection */
1487
1488 desc->u.hs.DeviceRemovable[0] = 1 << 1;
1489 desc->u.hs.DeviceRemovable[1] = ~0;
1490 return 0;
1491}
1492
1493static int imx21_hc_hub_status_data(struct usb_hcd *hcd, char *buf)
1494{
1495 struct imx21 *imx21 = hcd_to_imx21(hcd);
1496 int ports;
1497 int changed = 0;
1498 int i;
1499 unsigned long flags;
1500
1501 spin_lock_irqsave(&imx21->lock, flags);
1502 ports = readl(imx21->regs + USBH_ROOTHUBA)
1503 & USBH_ROOTHUBA_NDNSTMPRT_MASK;
1504 if (ports > 7) {
1505 ports = 7;
1506 dev_err(imx21->dev, "ports %d > 7\n", ports);
1507 }
1508 for (i = 0; i < ports; i++) {
1509 if (readl(imx21->regs + USBH_PORTSTAT(i)) &
1510 (USBH_PORTSTAT_CONNECTSC |
1511 USBH_PORTSTAT_PRTENBLSC |
1512 USBH_PORTSTAT_PRTSTATSC |
1513 USBH_PORTSTAT_OVRCURIC |
1514 USBH_PORTSTAT_PRTRSTSC)) {
1515
1516 changed = 1;
1517 buf[0] |= 1 << (i + 1);
1518 }
1519 }
1520 spin_unlock_irqrestore(&imx21->lock, flags);
1521
1522 if (changed)
1523 dev_info(imx21->dev, "Hub status changed\n");
1524 return changed;
1525}
1526
1527static int imx21_hc_hub_control(struct usb_hcd *hcd,
1528 u16 typeReq,
1529 u16 wValue, u16 wIndex, char *buf, u16 wLength)
1530{
1531 struct imx21 *imx21 = hcd_to_imx21(hcd);
1532 int rc = 0;
1533 u32 status_write = 0;
1534
1535 switch (typeReq) {
1536 case ClearHubFeature:
1537 dev_dbg(imx21->dev, "ClearHubFeature\n");
1538 switch (wValue) {
1539 case C_HUB_OVER_CURRENT:
1540 dev_dbg(imx21->dev, " OVER_CURRENT\n");
1541 break;
1542 case C_HUB_LOCAL_POWER:
1543 dev_dbg(imx21->dev, " LOCAL_POWER\n");
1544 break;
1545 default:
1546 dev_dbg(imx21->dev, " unknown\n");
1547 rc = -EINVAL;
1548 break;
1549 }
1550 break;
1551
1552 case ClearPortFeature:
1553 dev_dbg(imx21->dev, "ClearPortFeature\n");
1554 switch (wValue) {
1555 case USB_PORT_FEAT_ENABLE:
1556 dev_dbg(imx21->dev, " ENABLE\n");
1557 status_write = USBH_PORTSTAT_CURCONST;
1558 break;
1559 case USB_PORT_FEAT_SUSPEND:
1560 dev_dbg(imx21->dev, " SUSPEND\n");
1561 status_write = USBH_PORTSTAT_PRTOVRCURI;
1562 break;
1563 case USB_PORT_FEAT_POWER:
1564 dev_dbg(imx21->dev, " POWER\n");
1565 status_write = USBH_PORTSTAT_LSDEVCON;
1566 break;
1567 case USB_PORT_FEAT_C_ENABLE:
1568 dev_dbg(imx21->dev, " C_ENABLE\n");
1569 status_write = USBH_PORTSTAT_PRTENBLSC;
1570 break;
1571 case USB_PORT_FEAT_C_SUSPEND:
1572 dev_dbg(imx21->dev, " C_SUSPEND\n");
1573 status_write = USBH_PORTSTAT_PRTSTATSC;
1574 break;
1575 case USB_PORT_FEAT_C_CONNECTION:
1576 dev_dbg(imx21->dev, " C_CONNECTION\n");
1577 status_write = USBH_PORTSTAT_CONNECTSC;
1578 break;
1579 case USB_PORT_FEAT_C_OVER_CURRENT:
1580 dev_dbg(imx21->dev, " C_OVER_CURRENT\n");
1581 status_write = USBH_PORTSTAT_OVRCURIC;
1582 break;
1583 case USB_PORT_FEAT_C_RESET:
1584 dev_dbg(imx21->dev, " C_RESET\n");
1585 status_write = USBH_PORTSTAT_PRTRSTSC;
1586 break;
1587 default:
1588 dev_dbg(imx21->dev, " unknown\n");
1589 rc = -EINVAL;
1590 break;
1591 }
1592
1593 break;
1594
1595 case GetHubDescriptor:
1596 dev_dbg(imx21->dev, "GetHubDescriptor\n");
1597 rc = get_hub_descriptor(hcd, (void *)buf);
1598 break;
1599
1600 case GetHubStatus:
1601 dev_dbg(imx21->dev, " GetHubStatus\n");
1602 *(__le32 *) buf = 0;
1603 break;
1604
1605 case GetPortStatus:
1606 dev_dbg(imx21->dev, "GetPortStatus: port: %d, 0x%x\n",
1607 wIndex, USBH_PORTSTAT(wIndex - 1));
1608 *(__le32 *) buf = readl(imx21->regs +
1609 USBH_PORTSTAT(wIndex - 1));
1610 break;
1611
1612 case SetHubFeature:
1613 dev_dbg(imx21->dev, "SetHubFeature\n");
1614 switch (wValue) {
1615 case C_HUB_OVER_CURRENT:
1616 dev_dbg(imx21->dev, " OVER_CURRENT\n");
1617 break;
1618
1619 case C_HUB_LOCAL_POWER:
1620 dev_dbg(imx21->dev, " LOCAL_POWER\n");
1621 break;
1622 default:
1623 dev_dbg(imx21->dev, " unknown\n");
1624 rc = -EINVAL;
1625 break;
1626 }
1627
1628 break;
1629
1630 case SetPortFeature:
1631 dev_dbg(imx21->dev, "SetPortFeature\n");
1632 switch (wValue) {
1633 case USB_PORT_FEAT_SUSPEND:
1634 dev_dbg(imx21->dev, " SUSPEND\n");
1635 status_write = USBH_PORTSTAT_PRTSUSPST;
1636 break;
1637 case USB_PORT_FEAT_POWER:
1638 dev_dbg(imx21->dev, " POWER\n");
1639 status_write = USBH_PORTSTAT_PRTPWRST;
1640 break;
1641 case USB_PORT_FEAT_RESET:
1642 dev_dbg(imx21->dev, " RESET\n");
1643 status_write = USBH_PORTSTAT_PRTRSTST;
1644 break;
1645 default:
1646 dev_dbg(imx21->dev, " unknown\n");
1647 rc = -EINVAL;
1648 break;
1649 }
1650 break;
1651
1652 default:
1653 dev_dbg(imx21->dev, " unknown\n");
1654 rc = -EINVAL;
1655 break;
1656 }
1657
1658 if (status_write)
1659 writel(status_write, imx21->regs + USBH_PORTSTAT(wIndex - 1));
1660 return rc;
1661}
1662
1663/* =========================================== */
1664/* Host controller management */
1665/* =========================================== */
1666
1667static int imx21_hc_reset(struct usb_hcd *hcd)
1668{
1669 struct imx21 *imx21 = hcd_to_imx21(hcd);
1670 unsigned long timeout;
1671 unsigned long flags;
1672
1673 spin_lock_irqsave(&imx21->lock, flags);
1674
1675 /* Reset the Host controller modules */
1676 writel(USBOTG_RST_RSTCTRL | USBOTG_RST_RSTRH |
1677 USBOTG_RST_RSTHSIE | USBOTG_RST_RSTHC,
1678 imx21->regs + USBOTG_RST_CTRL);
1679
1680 /* Wait for reset to finish */
1681 timeout = jiffies + HZ;
1682 while (readl(imx21->regs + USBOTG_RST_CTRL) != 0) {
1683 if (time_after(jiffies, timeout)) {
1684 spin_unlock_irqrestore(&imx21->lock, flags);
1685 dev_err(imx21->dev, "timeout waiting for reset\n");
1686 return -ETIMEDOUT;
1687 }
1688 spin_unlock_irq(&imx21->lock);
1689 schedule_timeout_uninterruptible(1);
1690 spin_lock_irq(&imx21->lock);
1691 }
1692 spin_unlock_irqrestore(&imx21->lock, flags);
1693 return 0;
1694}
1695
1696static int imx21_hc_start(struct usb_hcd *hcd)
1697{
1698 struct imx21 *imx21 = hcd_to_imx21(hcd);
1699 unsigned long flags;
1700 int i, j;
1701 u32 hw_mode = USBOTG_HWMODE_CRECFG_HOST;
1702 u32 usb_control = 0;
1703
1704 hw_mode |= ((imx21->pdata->host_xcvr << USBOTG_HWMODE_HOSTXCVR_SHIFT) &
1705 USBOTG_HWMODE_HOSTXCVR_MASK);
1706 hw_mode |= ((imx21->pdata->otg_xcvr << USBOTG_HWMODE_OTGXCVR_SHIFT) &
1707 USBOTG_HWMODE_OTGXCVR_MASK);
1708
1709 if (imx21->pdata->host1_txenoe)
1710 usb_control |= USBCTRL_HOST1_TXEN_OE;
1711
1712 if (!imx21->pdata->host1_xcverless)
1713 usb_control |= USBCTRL_HOST1_BYP_TLL;
1714
1715 if (imx21->pdata->otg_ext_xcvr)
1716 usb_control |= USBCTRL_OTC_RCV_RXDP;
1717
1718
1719 spin_lock_irqsave(&imx21->lock, flags);
1720
1721 writel((USBOTG_CLK_CTRL_HST | USBOTG_CLK_CTRL_MAIN),
1722 imx21->regs + USBOTG_CLK_CTRL);
1723 writel(hw_mode, imx21->regs + USBOTG_HWMODE);
1724 writel(usb_control, imx21->regs + USBCTRL);
1725 writel(USB_MISCCONTROL_SKPRTRY | USB_MISCCONTROL_ARBMODE,
1726 imx21->regs + USB_MISCCONTROL);
1727
1728 /* Clear the ETDs */
1729 for (i = 0; i < USB_NUM_ETD; i++)
1730 for (j = 0; j < 4; j++)
1731 etd_writel(imx21, i, j, 0);
1732
1733 /* Take the HC out of reset */
1734 writel(USBH_HOST_CTRL_HCUSBSTE_OPERATIONAL | USBH_HOST_CTRL_CTLBLKSR_1,
1735 imx21->regs + USBH_HOST_CTRL);
1736
1737 /* Enable ports */
1738 if (imx21->pdata->enable_otg_host)
1739 writel(USBH_PORTSTAT_PRTPWRST | USBH_PORTSTAT_PRTENABST,
1740 imx21->regs + USBH_PORTSTAT(0));
1741
1742 if (imx21->pdata->enable_host1)
1743 writel(USBH_PORTSTAT_PRTPWRST | USBH_PORTSTAT_PRTENABST,
1744 imx21->regs + USBH_PORTSTAT(1));
1745
1746 if (imx21->pdata->enable_host2)
1747 writel(USBH_PORTSTAT_PRTPWRST | USBH_PORTSTAT_PRTENABST,
1748 imx21->regs + USBH_PORTSTAT(2));
1749
1750
1751 hcd->state = HC_STATE_RUNNING;
1752
1753 /* Enable host controller interrupts */
1754 set_register_bits(imx21, USBH_SYSIEN,
1755 USBH_SYSIEN_HERRINT |
1756 USBH_SYSIEN_DONEINT | USBH_SYSIEN_SORINT);
1757 set_register_bits(imx21, USBOTG_CINT_STEN, USBOTG_HCINT);
1758
1759 spin_unlock_irqrestore(&imx21->lock, flags);
1760
1761 return 0;
1762}
1763
1764static void imx21_hc_stop(struct usb_hcd *hcd)
1765{
1766 struct imx21 *imx21 = hcd_to_imx21(hcd);
1767 unsigned long flags;
1768
1769 spin_lock_irqsave(&imx21->lock, flags);
1770
1771 writel(0, imx21->regs + USBH_SYSIEN);
1772 clear_register_bits(imx21, USBOTG_CINT_STEN, USBOTG_HCINT);
1773 clear_register_bits(imx21, USBOTG_CLK_CTRL_HST | USBOTG_CLK_CTRL_MAIN,
1774 USBOTG_CLK_CTRL);
1775 spin_unlock_irqrestore(&imx21->lock, flags);
1776}
1777
1778/* =========================================== */
1779/* Driver glue */
1780/* =========================================== */
1781
1782static struct hc_driver imx21_hc_driver = {
1783 .description = hcd_name,
1784 .product_desc = "IMX21 USB Host Controller",
1785 .hcd_priv_size = sizeof(struct imx21),
1786
1787 .flags = HCD_USB11,
1788 .irq = imx21_irq,
1789
1790 .reset = imx21_hc_reset,
1791 .start = imx21_hc_start,
1792 .stop = imx21_hc_stop,
1793
1794 /* I/O requests */
1795 .urb_enqueue = imx21_hc_urb_enqueue,
1796 .urb_dequeue = imx21_hc_urb_dequeue,
1797 .endpoint_disable = imx21_hc_endpoint_disable,
1798
1799 /* scheduling support */
1800 .get_frame_number = imx21_hc_get_frame,
1801
1802 /* Root hub support */
1803 .hub_status_data = imx21_hc_hub_status_data,
1804 .hub_control = imx21_hc_hub_control,
1805
1806};
1807
1808static struct mx21_usbh_platform_data default_pdata = {
1809 .host_xcvr = MX21_USBXCVR_TXDIF_RXDIF,
1810 .otg_xcvr = MX21_USBXCVR_TXDIF_RXDIF,
1811 .enable_host1 = 1,
1812 .enable_host2 = 1,
1813 .enable_otg_host = 1,
1814
1815};
1816
1817static int imx21_remove(struct platform_device *pdev)
1818{
1819 struct usb_hcd *hcd = platform_get_drvdata(pdev);
1820 struct imx21 *imx21 = hcd_to_imx21(hcd);
1821 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1822
1823 remove_debug_files(imx21);
1824 usb_remove_hcd(hcd);
1825
1826 if (res != NULL) {
1827 clk_disable_unprepare(imx21->clk);
1828 clk_put(imx21->clk);
1829 iounmap(imx21->regs);
1830 release_mem_region(res->start, resource_size(res));
1831 }
1832
1833 kfree(hcd);
1834 return 0;
1835}
1836
1837
1838static int imx21_probe(struct platform_device *pdev)
1839{
1840 struct usb_hcd *hcd;
1841 struct imx21 *imx21;
1842 struct resource *res;
1843 int ret;
1844 int irq;
1845
1846 printk(KERN_INFO "%s\n", imx21_hc_driver.product_desc);
1847
1848 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1849 if (!res)
1850 return -ENODEV;
1851 irq = platform_get_irq(pdev, 0);
1852 if (irq < 0)
1853 return -ENXIO;
1854
1855 hcd = usb_create_hcd(&imx21_hc_driver,
1856 &pdev->dev, dev_name(&pdev->dev));
1857 if (hcd == NULL) {
1858 dev_err(&pdev->dev, "Cannot create hcd (%s)\n",
1859 dev_name(&pdev->dev));
1860 return -ENOMEM;
1861 }
1862
1863 imx21 = hcd_to_imx21(hcd);
1864 imx21->hcd = hcd;
1865 imx21->dev = &pdev->dev;
1866 imx21->pdata = dev_get_platdata(&pdev->dev);
1867 if (!imx21->pdata)
1868 imx21->pdata = &default_pdata;
1869
1870 spin_lock_init(&imx21->lock);
1871 INIT_LIST_HEAD(&imx21->dmem_list);
1872 INIT_LIST_HEAD(&imx21->queue_for_etd);
1873 INIT_LIST_HEAD(&imx21->queue_for_dmem);
1874 create_debug_files(imx21);
1875
1876 res = request_mem_region(res->start, resource_size(res), hcd_name);
1877 if (!res) {
1878 ret = -EBUSY;
1879 goto failed_request_mem;
1880 }
1881
1882 imx21->regs = ioremap(res->start, resource_size(res));
1883 if (imx21->regs == NULL) {
1884 dev_err(imx21->dev, "Cannot map registers\n");
1885 ret = -ENOMEM;
1886 goto failed_ioremap;
1887 }
1888
1889 /* Enable clocks source */
1890 imx21->clk = clk_get(imx21->dev, NULL);
1891 if (IS_ERR(imx21->clk)) {
1892 dev_err(imx21->dev, "no clock found\n");
1893 ret = PTR_ERR(imx21->clk);
1894 goto failed_clock_get;
1895 }
1896
1897 ret = clk_set_rate(imx21->clk, clk_round_rate(imx21->clk, 48000000));
1898 if (ret)
1899 goto failed_clock_set;
1900 ret = clk_prepare_enable(imx21->clk);
1901 if (ret)
1902 goto failed_clock_enable;
1903
1904 dev_info(imx21->dev, "Hardware HC revision: 0x%02X\n",
1905 (readl(imx21->regs + USBOTG_HWMODE) >> 16) & 0xFF);
1906
1907 ret = usb_add_hcd(hcd, irq, 0);
1908 if (ret != 0) {
1909 dev_err(imx21->dev, "usb_add_hcd() returned %d\n", ret);
1910 goto failed_add_hcd;
1911 }
1912 device_wakeup_enable(hcd->self.controller);
1913
1914 return 0;
1915
1916failed_add_hcd:
1917 clk_disable_unprepare(imx21->clk);
1918failed_clock_enable:
1919failed_clock_set:
1920 clk_put(imx21->clk);
1921failed_clock_get:
1922 iounmap(imx21->regs);
1923failed_ioremap:
1924 release_mem_region(res->start, resource_size(res));
1925failed_request_mem:
1926 remove_debug_files(imx21);
1927 usb_put_hcd(hcd);
1928 return ret;
1929}
1930
1931static struct platform_driver imx21_hcd_driver = {
1932 .driver = {
1933 .name = hcd_name,
1934 },
1935 .probe = imx21_probe,
1936 .remove = imx21_remove,
1937 .suspend = NULL,
1938 .resume = NULL,
1939};
1940
1941module_platform_driver(imx21_hcd_driver);
1942
1943MODULE_DESCRIPTION("i.MX21 USB Host controller");
1944MODULE_AUTHOR("Martin Fuzzey");
1945MODULE_LICENSE("GPL");
1946MODULE_ALIAS("platform:imx21-hcd");