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1/*
2 * c67x00-sched.c: Cypress C67X00 USB Host Controller Driver - TD scheduling
3 *
4 * Copyright (C) 2006-2008 Barco N.V.
5 * Derived from the Cypress cy7c67200/300 ezusb linux driver and
6 * based on multiple host controller drivers inside the linux kernel.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
21 * MA 02110-1301 USA.
22 */
23
24#include <linux/kthread.h>
25#include <linux/slab.h>
26
27#include "c67x00.h"
28#include "c67x00-hcd.h"
29
30/*
31 * These are the stages for a control urb, they are kept
32 * in both urb->interval and td->privdata.
33 */
34#define SETUP_STAGE 0
35#define DATA_STAGE 1
36#define STATUS_STAGE 2
37
38/* -------------------------------------------------------------------------- */
39
40/**
41 * struct c67x00_ep_data: Host endpoint data structure
42 */
43struct c67x00_ep_data {
44 struct list_head queue;
45 struct list_head node;
46 struct usb_host_endpoint *hep;
47 struct usb_device *dev;
48 u16 next_frame; /* For int/isoc transactions */
49};
50
51/**
52 * struct c67x00_td
53 *
54 * Hardware parts are little endiannes, SW in CPU endianess.
55 */
56struct c67x00_td {
57 /* HW specific part */
58 __le16 ly_base_addr; /* Bytes 0-1 */
59 __le16 port_length; /* Bytes 2-3 */
60 u8 pid_ep; /* Byte 4 */
61 u8 dev_addr; /* Byte 5 */
62 u8 ctrl_reg; /* Byte 6 */
63 u8 status; /* Byte 7 */
64 u8 retry_cnt; /* Byte 8 */
65#define TT_OFFSET 2
66#define TT_CONTROL 0
67#define TT_ISOCHRONOUS 1
68#define TT_BULK 2
69#define TT_INTERRUPT 3
70 u8 residue; /* Byte 9 */
71 __le16 next_td_addr; /* Bytes 10-11 */
72 /* SW part */
73 struct list_head td_list;
74 u16 td_addr;
75 void *data;
76 struct urb *urb;
77 unsigned long privdata;
78
79 /* These are needed for handling the toggle bits:
80 * an urb can be dequeued while a td is in progress
81 * after checking the td, the toggle bit might need to
82 * be fixed */
83 struct c67x00_ep_data *ep_data;
84 unsigned int pipe;
85};
86
87struct c67x00_urb_priv {
88 struct list_head hep_node;
89 struct urb *urb;
90 int port;
91 int cnt; /* packet number for isoc */
92 int status;
93 struct c67x00_ep_data *ep_data;
94};
95
96#define td_udev(td) ((td)->ep_data->dev)
97
98#define CY_TD_SIZE 12
99
100#define TD_PIDEP_OFFSET 0x04
101#define TD_PIDEPMASK_PID 0xF0
102#define TD_PIDEPMASK_EP 0x0F
103#define TD_PORTLENMASK_DL 0x02FF
104#define TD_PORTLENMASK_PN 0xC000
105
106#define TD_STATUS_OFFSET 0x07
107#define TD_STATUSMASK_ACK 0x01
108#define TD_STATUSMASK_ERR 0x02
109#define TD_STATUSMASK_TMOUT 0x04
110#define TD_STATUSMASK_SEQ 0x08
111#define TD_STATUSMASK_SETUP 0x10
112#define TD_STATUSMASK_OVF 0x20
113#define TD_STATUSMASK_NAK 0x40
114#define TD_STATUSMASK_STALL 0x80
115
116#define TD_ERROR_MASK (TD_STATUSMASK_ERR | TD_STATUSMASK_TMOUT | \
117 TD_STATUSMASK_STALL)
118
119#define TD_RETRYCNT_OFFSET 0x08
120#define TD_RETRYCNTMASK_ACT_FLG 0x10
121#define TD_RETRYCNTMASK_TX_TYPE 0x0C
122#define TD_RETRYCNTMASK_RTY_CNT 0x03
123
124#define TD_RESIDUE_OVERFLOW 0x80
125
126#define TD_PID_IN 0x90
127
128/* Residue: signed 8bits, neg -> OVERFLOW, pos -> UNDERFLOW */
129#define td_residue(td) ((__s8)(td->residue))
130#define td_ly_base_addr(td) (__le16_to_cpu((td)->ly_base_addr))
131#define td_port_length(td) (__le16_to_cpu((td)->port_length))
132#define td_next_td_addr(td) (__le16_to_cpu((td)->next_td_addr))
133
134#define td_active(td) ((td)->retry_cnt & TD_RETRYCNTMASK_ACT_FLG)
135#define td_length(td) (td_port_length(td) & TD_PORTLENMASK_DL)
136
137#define td_sequence_ok(td) (!td->status || \
138 (!(td->status & TD_STATUSMASK_SEQ) == \
139 !(td->ctrl_reg & SEQ_SEL)))
140
141#define td_acked(td) (!td->status || \
142 (td->status & TD_STATUSMASK_ACK))
143#define td_actual_bytes(td) (td_length(td) - td_residue(td))
144
145/* -------------------------------------------------------------------------- */
146
147#ifdef DEBUG
148
149/**
150 * dbg_td - Dump the contents of the TD
151 */
152static void dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg)
153{
154 struct device *dev = c67x00_hcd_dev(c67x00);
155
156 dev_dbg(dev, "### %s at 0x%04x\n", msg, td->td_addr);
157 dev_dbg(dev, "urb: 0x%p\n", td->urb);
158 dev_dbg(dev, "endpoint: %4d\n", usb_pipeendpoint(td->pipe));
159 dev_dbg(dev, "pipeout: %4d\n", usb_pipeout(td->pipe));
160 dev_dbg(dev, "ly_base_addr: 0x%04x\n", td_ly_base_addr(td));
161 dev_dbg(dev, "port_length: 0x%04x\n", td_port_length(td));
162 dev_dbg(dev, "pid_ep: 0x%02x\n", td->pid_ep);
163 dev_dbg(dev, "dev_addr: 0x%02x\n", td->dev_addr);
164 dev_dbg(dev, "ctrl_reg: 0x%02x\n", td->ctrl_reg);
165 dev_dbg(dev, "status: 0x%02x\n", td->status);
166 dev_dbg(dev, "retry_cnt: 0x%02x\n", td->retry_cnt);
167 dev_dbg(dev, "residue: 0x%02x\n", td->residue);
168 dev_dbg(dev, "next_td_addr: 0x%04x\n", td_next_td_addr(td));
169 dev_dbg(dev, "data:");
170 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 1,
171 td->data, td_length(td), 1);
172}
173#else /* DEBUG */
174
175static inline void
176dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg) { }
177
178#endif /* DEBUG */
179
180/* -------------------------------------------------------------------------- */
181/* Helper functions */
182
183static inline u16 c67x00_get_current_frame_number(struct c67x00_hcd *c67x00)
184{
185 return c67x00_ll_husb_get_frame(c67x00->sie) & HOST_FRAME_MASK;
186}
187
188/**
189 * frame_add
190 * Software wraparound for framenumbers.
191 */
192static inline u16 frame_add(u16 a, u16 b)
193{
194 return (a + b) & HOST_FRAME_MASK;
195}
196
197/**
198 * frame_after - is frame a after frame b
199 */
200static inline int frame_after(u16 a, u16 b)
201{
202 return ((HOST_FRAME_MASK + a - b) & HOST_FRAME_MASK) <
203 (HOST_FRAME_MASK / 2);
204}
205
206/**
207 * frame_after_eq - is frame a after or equal to frame b
208 */
209static inline int frame_after_eq(u16 a, u16 b)
210{
211 return ((HOST_FRAME_MASK + 1 + a - b) & HOST_FRAME_MASK) <
212 (HOST_FRAME_MASK / 2);
213}
214
215/* -------------------------------------------------------------------------- */
216
217/**
218 * c67x00_release_urb - remove link from all tds to this urb
219 * Disconnects the urb from it's tds, so that it can be given back.
220 * pre: urb->hcpriv != NULL
221 */
222static void c67x00_release_urb(struct c67x00_hcd *c67x00, struct urb *urb)
223{
224 struct c67x00_td *td;
225 struct c67x00_urb_priv *urbp;
226
227 BUG_ON(!urb);
228
229 c67x00->urb_count--;
230
231 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
232 c67x00->urb_iso_count--;
233 if (c67x00->urb_iso_count == 0)
234 c67x00->max_frame_bw = MAX_FRAME_BW_STD;
235 }
236
237 /* TODO this might be not so efficient when we've got many urbs!
238 * Alternatives:
239 * * only clear when needed
240 * * keep a list of tds with each urbp
241 */
242 list_for_each_entry(td, &c67x00->td_list, td_list)
243 if (urb == td->urb)
244 td->urb = NULL;
245
246 urbp = urb->hcpriv;
247 urb->hcpriv = NULL;
248 list_del(&urbp->hep_node);
249 kfree(urbp);
250}
251
252/* -------------------------------------------------------------------------- */
253
254static struct c67x00_ep_data *
255c67x00_ep_data_alloc(struct c67x00_hcd *c67x00, struct urb *urb)
256{
257 struct usb_host_endpoint *hep = urb->ep;
258 struct c67x00_ep_data *ep_data;
259 int type;
260
261 c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
262
263 /* Check if endpoint already has a c67x00_ep_data struct allocated */
264 if (hep->hcpriv) {
265 ep_data = hep->hcpriv;
266 if (frame_after(c67x00->current_frame, ep_data->next_frame))
267 ep_data->next_frame =
268 frame_add(c67x00->current_frame, 1);
269 return hep->hcpriv;
270 }
271
272 /* Allocate and initialize a new c67x00 endpoint data structure */
273 ep_data = kzalloc(sizeof(*ep_data), GFP_ATOMIC);
274 if (!ep_data)
275 return NULL;
276
277 INIT_LIST_HEAD(&ep_data->queue);
278 INIT_LIST_HEAD(&ep_data->node);
279 ep_data->hep = hep;
280
281 /* hold a reference to udev as long as this endpoint lives,
282 * this is needed to possibly fix the data toggle */
283 ep_data->dev = usb_get_dev(urb->dev);
284 hep->hcpriv = ep_data;
285
286 /* For ISOC and INT endpoints, start ASAP: */
287 ep_data->next_frame = frame_add(c67x00->current_frame, 1);
288
289 /* Add the endpoint data to one of the pipe lists; must be added
290 in order of endpoint address */
291 type = usb_pipetype(urb->pipe);
292 if (list_empty(&ep_data->node)) {
293 list_add(&ep_data->node, &c67x00->list[type]);
294 } else {
295 struct c67x00_ep_data *prev;
296
297 list_for_each_entry(prev, &c67x00->list[type], node) {
298 if (prev->hep->desc.bEndpointAddress >
299 hep->desc.bEndpointAddress) {
300 list_add(&ep_data->node, prev->node.prev);
301 break;
302 }
303 }
304 }
305
306 return ep_data;
307}
308
309static int c67x00_ep_data_free(struct usb_host_endpoint *hep)
310{
311 struct c67x00_ep_data *ep_data = hep->hcpriv;
312
313 if (!ep_data)
314 return 0;
315
316 if (!list_empty(&ep_data->queue))
317 return -EBUSY;
318
319 usb_put_dev(ep_data->dev);
320 list_del(&ep_data->queue);
321 list_del(&ep_data->node);
322
323 kfree(ep_data);
324 hep->hcpriv = NULL;
325
326 return 0;
327}
328
329void c67x00_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
330{
331 struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
332 unsigned long flags;
333
334 if (!list_empty(&ep->urb_list))
335 dev_warn(c67x00_hcd_dev(c67x00), "error: urb list not empty\n");
336
337 spin_lock_irqsave(&c67x00->lock, flags);
338
339 /* loop waiting for all transfers in the endpoint queue to complete */
340 while (c67x00_ep_data_free(ep)) {
341 /* Drop the lock so we can sleep waiting for the hardware */
342 spin_unlock_irqrestore(&c67x00->lock, flags);
343
344 /* it could happen that we reinitialize this completion, while
345 * somebody was waiting for that completion. The timeout and
346 * while loop handle such cases, but this might be improved */
347 INIT_COMPLETION(c67x00->endpoint_disable);
348 c67x00_sched_kick(c67x00);
349 wait_for_completion_timeout(&c67x00->endpoint_disable, 1 * HZ);
350
351 spin_lock_irqsave(&c67x00->lock, flags);
352 }
353
354 spin_unlock_irqrestore(&c67x00->lock, flags);
355}
356
357/* -------------------------------------------------------------------------- */
358
359static inline int get_root_port(struct usb_device *dev)
360{
361 while (dev->parent->parent)
362 dev = dev->parent;
363 return dev->portnum;
364}
365
366int c67x00_urb_enqueue(struct usb_hcd *hcd,
367 struct urb *urb, gfp_t mem_flags)
368{
369 int ret;
370 unsigned long flags;
371 struct c67x00_urb_priv *urbp;
372 struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
373 int port = get_root_port(urb->dev)-1;
374
375 spin_lock_irqsave(&c67x00->lock, flags);
376
377 /* Make sure host controller is running */
378 if (!HC_IS_RUNNING(hcd->state)) {
379 ret = -ENODEV;
380 goto err_not_linked;
381 }
382
383 ret = usb_hcd_link_urb_to_ep(hcd, urb);
384 if (ret)
385 goto err_not_linked;
386
387 /* Allocate and initialize urb private data */
388 urbp = kzalloc(sizeof(*urbp), mem_flags);
389 if (!urbp) {
390 ret = -ENOMEM;
391 goto err_urbp;
392 }
393
394 INIT_LIST_HEAD(&urbp->hep_node);
395 urbp->urb = urb;
396 urbp->port = port;
397
398 urbp->ep_data = c67x00_ep_data_alloc(c67x00, urb);
399
400 if (!urbp->ep_data) {
401 ret = -ENOMEM;
402 goto err_epdata;
403 }
404
405 /* TODO claim bandwidth with usb_claim_bandwidth?
406 * also release it somewhere! */
407
408 urb->hcpriv = urbp;
409
410 urb->actual_length = 0; /* Nothing received/transmitted yet */
411
412 switch (usb_pipetype(urb->pipe)) {
413 case PIPE_CONTROL:
414 urb->interval = SETUP_STAGE;
415 break;
416 case PIPE_INTERRUPT:
417 break;
418 case PIPE_BULK:
419 break;
420 case PIPE_ISOCHRONOUS:
421 if (c67x00->urb_iso_count == 0)
422 c67x00->max_frame_bw = MAX_FRAME_BW_ISO;
423 c67x00->urb_iso_count++;
424 /* Assume always URB_ISO_ASAP, FIXME */
425 if (list_empty(&urbp->ep_data->queue))
426 urb->start_frame = urbp->ep_data->next_frame;
427 else {
428 /* Go right after the last one */
429 struct urb *last_urb;
430
431 last_urb = list_entry(urbp->ep_data->queue.prev,
432 struct c67x00_urb_priv,
433 hep_node)->urb;
434 urb->start_frame =
435 frame_add(last_urb->start_frame,
436 last_urb->number_of_packets *
437 last_urb->interval);
438 }
439 urbp->cnt = 0;
440 break;
441 }
442
443 /* Add the URB to the endpoint queue */
444 list_add_tail(&urbp->hep_node, &urbp->ep_data->queue);
445
446 /* If this is the only URB, kick start the controller */
447 if (!c67x00->urb_count++)
448 c67x00_ll_hpi_enable_sofeop(c67x00->sie);
449
450 c67x00_sched_kick(c67x00);
451 spin_unlock_irqrestore(&c67x00->lock, flags);
452
453 return 0;
454
455err_epdata:
456 kfree(urbp);
457err_urbp:
458 usb_hcd_unlink_urb_from_ep(hcd, urb);
459err_not_linked:
460 spin_unlock_irqrestore(&c67x00->lock, flags);
461
462 return ret;
463}
464
465int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
466{
467 struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
468 unsigned long flags;
469 int rc;
470
471 spin_lock_irqsave(&c67x00->lock, flags);
472 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
473 if (rc)
474 goto done;
475
476 c67x00_release_urb(c67x00, urb);
477 usb_hcd_unlink_urb_from_ep(hcd, urb);
478
479 spin_unlock(&c67x00->lock);
480 usb_hcd_giveback_urb(hcd, urb, status);
481 spin_lock(&c67x00->lock);
482
483 spin_unlock_irqrestore(&c67x00->lock, flags);
484
485 return 0;
486
487 done:
488 spin_unlock_irqrestore(&c67x00->lock, flags);
489 return rc;
490}
491
492/* -------------------------------------------------------------------------- */
493
494/*
495 * pre: c67x00 locked, urb unlocked
496 */
497static void
498c67x00_giveback_urb(struct c67x00_hcd *c67x00, struct urb *urb, int status)
499{
500 struct c67x00_urb_priv *urbp;
501
502 if (!urb)
503 return;
504
505 urbp = urb->hcpriv;
506 urbp->status = status;
507
508 list_del_init(&urbp->hep_node);
509
510 c67x00_release_urb(c67x00, urb);
511 usb_hcd_unlink_urb_from_ep(c67x00_hcd_to_hcd(c67x00), urb);
512 spin_unlock(&c67x00->lock);
513 usb_hcd_giveback_urb(c67x00_hcd_to_hcd(c67x00), urb, urbp->status);
514 spin_lock(&c67x00->lock);
515}
516
517/* -------------------------------------------------------------------------- */
518
519static int c67x00_claim_frame_bw(struct c67x00_hcd *c67x00, struct urb *urb,
520 int len, int periodic)
521{
522 struct c67x00_urb_priv *urbp = urb->hcpriv;
523 int bit_time;
524
525 /* According to the C67x00 BIOS user manual, page 3-18,19, the
526 * following calculations provide the full speed bit times for
527 * a transaction.
528 *
529 * FS(in) = 112.5 + 9.36*BC + HOST_DELAY
530 * FS(in,iso) = 90.5 + 9.36*BC + HOST_DELAY
531 * FS(out) = 112.5 + 9.36*BC + HOST_DELAY
532 * FS(out,iso) = 78.4 + 9.36*BC + HOST_DELAY
533 * LS(in) = 802.4 + 75.78*BC + HOST_DELAY
534 * LS(out) = 802.6 + 74.67*BC + HOST_DELAY
535 *
536 * HOST_DELAY == 106 for the c67200 and c67300.
537 */
538
539 /* make calculations in 1/100 bit times to maintain resolution */
540 if (urbp->ep_data->dev->speed == USB_SPEED_LOW) {
541 /* Low speed pipe */
542 if (usb_pipein(urb->pipe))
543 bit_time = 80240 + 7578*len;
544 else
545 bit_time = 80260 + 7467*len;
546 } else {
547 /* FS pipes */
548 if (usb_pipeisoc(urb->pipe))
549 bit_time = usb_pipein(urb->pipe) ? 9050 : 7840;
550 else
551 bit_time = 11250;
552 bit_time += 936*len;
553 }
554
555 /* Scale back down to integer bit times. Use a host delay of 106.
556 * (this is the only place it is used) */
557 bit_time = ((bit_time+50) / 100) + 106;
558
559 if (unlikely(bit_time + c67x00->bandwidth_allocated >=
560 c67x00->max_frame_bw))
561 return -EMSGSIZE;
562
563 if (unlikely(c67x00->next_td_addr + CY_TD_SIZE >=
564 c67x00->td_base_addr + SIE_TD_SIZE))
565 return -EMSGSIZE;
566
567 if (unlikely(c67x00->next_buf_addr + len >=
568 c67x00->buf_base_addr + SIE_TD_BUF_SIZE))
569 return -EMSGSIZE;
570
571 if (periodic) {
572 if (unlikely(bit_time + c67x00->periodic_bw_allocated >=
573 MAX_PERIODIC_BW(c67x00->max_frame_bw)))
574 return -EMSGSIZE;
575 c67x00->periodic_bw_allocated += bit_time;
576 }
577
578 c67x00->bandwidth_allocated += bit_time;
579 return 0;
580}
581
582/* -------------------------------------------------------------------------- */
583
584/**
585 * td_addr and buf_addr must be word aligned
586 */
587static int c67x00_create_td(struct c67x00_hcd *c67x00, struct urb *urb,
588 void *data, int len, int pid, int toggle,
589 unsigned long privdata)
590{
591 struct c67x00_td *td;
592 struct c67x00_urb_priv *urbp = urb->hcpriv;
593 const __u8 active_flag = 1, retry_cnt = 1;
594 __u8 cmd = 0;
595 int tt = 0;
596
597 if (c67x00_claim_frame_bw(c67x00, urb, len, usb_pipeisoc(urb->pipe)
598 || usb_pipeint(urb->pipe)))
599 return -EMSGSIZE; /* Not really an error, but expected */
600
601 td = kzalloc(sizeof(*td), GFP_ATOMIC);
602 if (!td)
603 return -ENOMEM;
604
605 td->pipe = urb->pipe;
606 td->ep_data = urbp->ep_data;
607
608 if ((td_udev(td)->speed == USB_SPEED_LOW) &&
609 !(c67x00->low_speed_ports & (1 << urbp->port)))
610 cmd |= PREAMBLE_EN;
611
612 switch (usb_pipetype(td->pipe)) {
613 case PIPE_ISOCHRONOUS:
614 tt = TT_ISOCHRONOUS;
615 cmd |= ISO_EN;
616 break;
617 case PIPE_CONTROL:
618 tt = TT_CONTROL;
619 break;
620 case PIPE_BULK:
621 tt = TT_BULK;
622 break;
623 case PIPE_INTERRUPT:
624 tt = TT_INTERRUPT;
625 break;
626 }
627
628 if (toggle)
629 cmd |= SEQ_SEL;
630
631 cmd |= ARM_EN;
632
633 /* SW part */
634 td->td_addr = c67x00->next_td_addr;
635 c67x00->next_td_addr = c67x00->next_td_addr + CY_TD_SIZE;
636
637 /* HW part */
638 td->ly_base_addr = __cpu_to_le16(c67x00->next_buf_addr);
639 td->port_length = __cpu_to_le16((c67x00->sie->sie_num << 15) |
640 (urbp->port << 14) | (len & 0x3FF));
641 td->pid_ep = ((pid & 0xF) << TD_PIDEP_OFFSET) |
642 (usb_pipeendpoint(td->pipe) & 0xF);
643 td->dev_addr = usb_pipedevice(td->pipe) & 0x7F;
644 td->ctrl_reg = cmd;
645 td->status = 0;
646 td->retry_cnt = (tt << TT_OFFSET) | (active_flag << 4) | retry_cnt;
647 td->residue = 0;
648 td->next_td_addr = __cpu_to_le16(c67x00->next_td_addr);
649
650 /* SW part */
651 td->data = data;
652 td->urb = urb;
653 td->privdata = privdata;
654
655 c67x00->next_buf_addr += (len + 1) & ~0x01; /* properly align */
656
657 list_add_tail(&td->td_list, &c67x00->td_list);
658 return 0;
659}
660
661static inline void c67x00_release_td(struct c67x00_td *td)
662{
663 list_del_init(&td->td_list);
664 kfree(td);
665}
666
667/* -------------------------------------------------------------------------- */
668
669static int c67x00_add_data_urb(struct c67x00_hcd *c67x00, struct urb *urb)
670{
671 int remaining;
672 int toggle;
673 int pid;
674 int ret = 0;
675 int maxps;
676 int need_empty;
677
678 toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
679 usb_pipeout(urb->pipe));
680 remaining = urb->transfer_buffer_length - urb->actual_length;
681
682 maxps = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
683
684 need_empty = (urb->transfer_flags & URB_ZERO_PACKET) &&
685 usb_pipeout(urb->pipe) && !(remaining % maxps);
686
687 while (remaining || need_empty) {
688 int len;
689 char *td_buf;
690
691 len = (remaining > maxps) ? maxps : remaining;
692 if (!len)
693 need_empty = 0;
694
695 pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
696 td_buf = urb->transfer_buffer + urb->transfer_buffer_length -
697 remaining;
698 ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, toggle,
699 DATA_STAGE);
700 if (ret)
701 return ret; /* td wasn't created */
702
703 toggle ^= 1;
704 remaining -= len;
705 if (usb_pipecontrol(urb->pipe))
706 break;
707 }
708
709 return 0;
710}
711
712/**
713 * return 0 in case more bandwidth is available, else errorcode
714 */
715static int c67x00_add_ctrl_urb(struct c67x00_hcd *c67x00, struct urb *urb)
716{
717 int ret;
718 int pid;
719
720 switch (urb->interval) {
721 default:
722 case SETUP_STAGE:
723 ret = c67x00_create_td(c67x00, urb, urb->setup_packet,
724 8, USB_PID_SETUP, 0, SETUP_STAGE);
725 if (ret)
726 return ret;
727 urb->interval = SETUP_STAGE;
728 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
729 usb_pipeout(urb->pipe), 1);
730 break;
731 case DATA_STAGE:
732 if (urb->transfer_buffer_length) {
733 ret = c67x00_add_data_urb(c67x00, urb);
734 if (ret)
735 return ret;
736 break;
737 } /* else fallthrough */
738 case STATUS_STAGE:
739 pid = !usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
740 ret = c67x00_create_td(c67x00, urb, NULL, 0, pid, 1,
741 STATUS_STAGE);
742 if (ret)
743 return ret;
744 break;
745 }
746
747 return 0;
748}
749
750/*
751 * return 0 in case more bandwidth is available, else errorcode
752 */
753static int c67x00_add_int_urb(struct c67x00_hcd *c67x00, struct urb *urb)
754{
755 struct c67x00_urb_priv *urbp = urb->hcpriv;
756
757 if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) {
758 urbp->ep_data->next_frame =
759 frame_add(urbp->ep_data->next_frame, urb->interval);
760 return c67x00_add_data_urb(c67x00, urb);
761 }
762 return 0;
763}
764
765static int c67x00_add_iso_urb(struct c67x00_hcd *c67x00, struct urb *urb)
766{
767 struct c67x00_urb_priv *urbp = urb->hcpriv;
768
769 if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) {
770 char *td_buf;
771 int len, pid, ret;
772
773 BUG_ON(urbp->cnt >= urb->number_of_packets);
774
775 td_buf = urb->transfer_buffer +
776 urb->iso_frame_desc[urbp->cnt].offset;
777 len = urb->iso_frame_desc[urbp->cnt].length;
778 pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
779
780 ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, 0,
781 urbp->cnt);
782 if (ret) {
783 printk(KERN_DEBUG "create failed: %d\n", ret);
784 urb->iso_frame_desc[urbp->cnt].actual_length = 0;
785 urb->iso_frame_desc[urbp->cnt].status = ret;
786 if (urbp->cnt + 1 == urb->number_of_packets)
787 c67x00_giveback_urb(c67x00, urb, 0);
788 }
789
790 urbp->ep_data->next_frame =
791 frame_add(urbp->ep_data->next_frame, urb->interval);
792 urbp->cnt++;
793 }
794 return 0;
795}
796
797/* -------------------------------------------------------------------------- */
798
799static void c67x00_fill_from_list(struct c67x00_hcd *c67x00, int type,
800 int (*add)(struct c67x00_hcd *, struct urb *))
801{
802 struct c67x00_ep_data *ep_data;
803 struct urb *urb;
804
805 /* traverse every endpoint on the list */
806 list_for_each_entry(ep_data, &c67x00->list[type], node) {
807 if (!list_empty(&ep_data->queue)) {
808 /* and add the first urb */
809 /* isochronous transfer rely on this */
810 urb = list_entry(ep_data->queue.next,
811 struct c67x00_urb_priv,
812 hep_node)->urb;
813 add(c67x00, urb);
814 }
815 }
816}
817
818static void c67x00_fill_frame(struct c67x00_hcd *c67x00)
819{
820 struct c67x00_td *td, *ttd;
821
822 /* Check if we can proceed */
823 if (!list_empty(&c67x00->td_list)) {
824 dev_warn(c67x00_hcd_dev(c67x00),
825 "TD list not empty! This should not happen!\n");
826 list_for_each_entry_safe(td, ttd, &c67x00->td_list, td_list) {
827 dbg_td(c67x00, td, "Unprocessed td");
828 c67x00_release_td(td);
829 }
830 }
831
832 /* Reinitialize variables */
833 c67x00->bandwidth_allocated = 0;
834 c67x00->periodic_bw_allocated = 0;
835
836 c67x00->next_td_addr = c67x00->td_base_addr;
837 c67x00->next_buf_addr = c67x00->buf_base_addr;
838
839 /* Fill the list */
840 c67x00_fill_from_list(c67x00, PIPE_ISOCHRONOUS, c67x00_add_iso_urb);
841 c67x00_fill_from_list(c67x00, PIPE_INTERRUPT, c67x00_add_int_urb);
842 c67x00_fill_from_list(c67x00, PIPE_CONTROL, c67x00_add_ctrl_urb);
843 c67x00_fill_from_list(c67x00, PIPE_BULK, c67x00_add_data_urb);
844}
845
846/* -------------------------------------------------------------------------- */
847
848/**
849 * Get TD from C67X00
850 */
851static inline void
852c67x00_parse_td(struct c67x00_hcd *c67x00, struct c67x00_td *td)
853{
854 c67x00_ll_read_mem_le16(c67x00->sie->dev,
855 td->td_addr, td, CY_TD_SIZE);
856
857 if (usb_pipein(td->pipe) && td_actual_bytes(td))
858 c67x00_ll_read_mem_le16(c67x00->sie->dev, td_ly_base_addr(td),
859 td->data, td_actual_bytes(td));
860}
861
862static int c67x00_td_to_error(struct c67x00_hcd *c67x00, struct c67x00_td *td)
863{
864 if (td->status & TD_STATUSMASK_ERR) {
865 dbg_td(c67x00, td, "ERROR_FLAG");
866 return -EILSEQ;
867 }
868 if (td->status & TD_STATUSMASK_STALL) {
869 /* dbg_td(c67x00, td, "STALL"); */
870 return -EPIPE;
871 }
872 if (td->status & TD_STATUSMASK_TMOUT) {
873 dbg_td(c67x00, td, "TIMEOUT");
874 return -ETIMEDOUT;
875 }
876
877 return 0;
878}
879
880static inline int c67x00_end_of_data(struct c67x00_td *td)
881{
882 int maxps, need_empty, remaining;
883 struct urb *urb = td->urb;
884 int act_bytes;
885
886 act_bytes = td_actual_bytes(td);
887
888 if (unlikely(!act_bytes))
889 return 1; /* This was an empty packet */
890
891 maxps = usb_maxpacket(td_udev(td), td->pipe, usb_pipeout(td->pipe));
892
893 if (unlikely(act_bytes < maxps))
894 return 1; /* Smaller then full packet */
895
896 remaining = urb->transfer_buffer_length - urb->actual_length;
897 need_empty = (urb->transfer_flags & URB_ZERO_PACKET) &&
898 usb_pipeout(urb->pipe) && !(remaining % maxps);
899
900 if (unlikely(!remaining && !need_empty))
901 return 1;
902
903 return 0;
904}
905
906/* -------------------------------------------------------------------------- */
907
908/* Remove all td's from the list which come
909 * after last_td and are meant for the same pipe.
910 * This is used when a short packet has occurred */
911static inline void c67x00_clear_pipe(struct c67x00_hcd *c67x00,
912 struct c67x00_td *last_td)
913{
914 struct c67x00_td *td, *tmp;
915 td = last_td;
916 tmp = last_td;
917 while (td->td_list.next != &c67x00->td_list) {
918 td = list_entry(td->td_list.next, struct c67x00_td, td_list);
919 if (td->pipe == last_td->pipe) {
920 c67x00_release_td(td);
921 td = tmp;
922 }
923 tmp = td;
924 }
925}
926
927/* -------------------------------------------------------------------------- */
928
929static void c67x00_handle_successful_td(struct c67x00_hcd *c67x00,
930 struct c67x00_td *td)
931{
932 struct urb *urb = td->urb;
933
934 if (!urb)
935 return;
936
937 urb->actual_length += td_actual_bytes(td);
938
939 switch (usb_pipetype(td->pipe)) {
940 /* isochronous tds are handled separately */
941 case PIPE_CONTROL:
942 switch (td->privdata) {
943 case SETUP_STAGE:
944 urb->interval =
945 urb->transfer_buffer_length ?
946 DATA_STAGE : STATUS_STAGE;
947 /* Don't count setup_packet with normal data: */
948 urb->actual_length = 0;
949 break;
950
951 case DATA_STAGE:
952 if (c67x00_end_of_data(td)) {
953 urb->interval = STATUS_STAGE;
954 c67x00_clear_pipe(c67x00, td);
955 }
956 break;
957
958 case STATUS_STAGE:
959 urb->interval = 0;
960 c67x00_giveback_urb(c67x00, urb, 0);
961 break;
962 }
963 break;
964
965 case PIPE_INTERRUPT:
966 case PIPE_BULK:
967 if (unlikely(c67x00_end_of_data(td))) {
968 c67x00_clear_pipe(c67x00, td);
969 c67x00_giveback_urb(c67x00, urb, 0);
970 }
971 break;
972 }
973}
974
975static void c67x00_handle_isoc(struct c67x00_hcd *c67x00, struct c67x00_td *td)
976{
977 struct urb *urb = td->urb;
978 struct c67x00_urb_priv *urbp;
979 int cnt;
980
981 if (!urb)
982 return;
983
984 urbp = urb->hcpriv;
985 cnt = td->privdata;
986
987 if (td->status & TD_ERROR_MASK)
988 urb->error_count++;
989
990 urb->iso_frame_desc[cnt].actual_length = td_actual_bytes(td);
991 urb->iso_frame_desc[cnt].status = c67x00_td_to_error(c67x00, td);
992 if (cnt + 1 == urb->number_of_packets) /* Last packet */
993 c67x00_giveback_urb(c67x00, urb, 0);
994}
995
996/* -------------------------------------------------------------------------- */
997
998/**
999 * c67x00_check_td_list - handle tds which have been processed by the c67x00
1000 * pre: current_td == 0
1001 */
1002static inline void c67x00_check_td_list(struct c67x00_hcd *c67x00)
1003{
1004 struct c67x00_td *td, *tmp;
1005 struct urb *urb;
1006 int ack_ok;
1007 int clear_endpoint;
1008
1009 list_for_each_entry_safe(td, tmp, &c67x00->td_list, td_list) {
1010 /* get the TD */
1011 c67x00_parse_td(c67x00, td);
1012 urb = td->urb; /* urb can be NULL! */
1013 ack_ok = 0;
1014 clear_endpoint = 1;
1015
1016 /* Handle isochronous transfers separately */
1017 if (usb_pipeisoc(td->pipe)) {
1018 clear_endpoint = 0;
1019 c67x00_handle_isoc(c67x00, td);
1020 goto cont;
1021 }
1022
1023 /* When an error occurs, all td's for that pipe go into an
1024 * inactive state. This state matches successful transfers so
1025 * we must make sure not to service them. */
1026 if (td->status & TD_ERROR_MASK) {
1027 c67x00_giveback_urb(c67x00, urb,
1028 c67x00_td_to_error(c67x00, td));
1029 goto cont;
1030 }
1031
1032 if ((td->status & TD_STATUSMASK_NAK) || !td_sequence_ok(td) ||
1033 !td_acked(td))
1034 goto cont;
1035
1036 /* Sequence ok and acked, don't need to fix toggle */
1037 ack_ok = 1;
1038
1039 if (unlikely(td->status & TD_STATUSMASK_OVF)) {
1040 if (td_residue(td) & TD_RESIDUE_OVERFLOW) {
1041 /* Overflow */
1042 c67x00_giveback_urb(c67x00, urb, -EOVERFLOW);
1043 goto cont;
1044 }
1045 }
1046
1047 clear_endpoint = 0;
1048 c67x00_handle_successful_td(c67x00, td);
1049
1050cont:
1051 if (clear_endpoint)
1052 c67x00_clear_pipe(c67x00, td);
1053 if (ack_ok)
1054 usb_settoggle(td_udev(td), usb_pipeendpoint(td->pipe),
1055 usb_pipeout(td->pipe),
1056 !(td->ctrl_reg & SEQ_SEL));
1057 /* next in list could have been removed, due to clear_pipe! */
1058 tmp = list_entry(td->td_list.next, typeof(*td), td_list);
1059 c67x00_release_td(td);
1060 }
1061}
1062
1063/* -------------------------------------------------------------------------- */
1064
1065static inline int c67x00_all_tds_processed(struct c67x00_hcd *c67x00)
1066{
1067 /* If all tds are processed, we can check the previous frame (if
1068 * there was any) and start our next frame.
1069 */
1070 return !c67x00_ll_husb_get_current_td(c67x00->sie);
1071}
1072
1073/**
1074 * Send td to C67X00
1075 */
1076static void c67x00_send_td(struct c67x00_hcd *c67x00, struct c67x00_td *td)
1077{
1078 int len = td_length(td);
1079
1080 if (len && ((td->pid_ep & TD_PIDEPMASK_PID) != TD_PID_IN))
1081 c67x00_ll_write_mem_le16(c67x00->sie->dev, td_ly_base_addr(td),
1082 td->data, len);
1083
1084 c67x00_ll_write_mem_le16(c67x00->sie->dev,
1085 td->td_addr, td, CY_TD_SIZE);
1086}
1087
1088static void c67x00_send_frame(struct c67x00_hcd *c67x00)
1089{
1090 struct c67x00_td *td;
1091
1092 if (list_empty(&c67x00->td_list))
1093 dev_warn(c67x00_hcd_dev(c67x00),
1094 "%s: td list should not be empty here!\n",
1095 __func__);
1096
1097 list_for_each_entry(td, &c67x00->td_list, td_list) {
1098 if (td->td_list.next == &c67x00->td_list)
1099 td->next_td_addr = 0; /* Last td in list */
1100
1101 c67x00_send_td(c67x00, td);
1102 }
1103
1104 c67x00_ll_husb_set_current_td(c67x00->sie, c67x00->td_base_addr);
1105}
1106
1107/* -------------------------------------------------------------------------- */
1108
1109/**
1110 * c67x00_do_work - Schedulers state machine
1111 */
1112static void c67x00_do_work(struct c67x00_hcd *c67x00)
1113{
1114 spin_lock(&c67x00->lock);
1115 /* Make sure all tds are processed */
1116 if (!c67x00_all_tds_processed(c67x00))
1117 goto out;
1118
1119 c67x00_check_td_list(c67x00);
1120
1121 /* no td's are being processed (current == 0)
1122 * and all have been "checked" */
1123 complete(&c67x00->endpoint_disable);
1124
1125 if (!list_empty(&c67x00->td_list))
1126 goto out;
1127
1128 c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
1129 if (c67x00->current_frame == c67x00->last_frame)
1130 goto out; /* Don't send tds in same frame */
1131 c67x00->last_frame = c67x00->current_frame;
1132
1133 /* If no urbs are scheduled, our work is done */
1134 if (!c67x00->urb_count) {
1135 c67x00_ll_hpi_disable_sofeop(c67x00->sie);
1136 goto out;
1137 }
1138
1139 c67x00_fill_frame(c67x00);
1140 if (!list_empty(&c67x00->td_list))
1141 /* TD's have been added to the frame */
1142 c67x00_send_frame(c67x00);
1143
1144 out:
1145 spin_unlock(&c67x00->lock);
1146}
1147
1148/* -------------------------------------------------------------------------- */
1149
1150static void c67x00_sched_tasklet(unsigned long __c67x00)
1151{
1152 struct c67x00_hcd *c67x00 = (struct c67x00_hcd *)__c67x00;
1153 c67x00_do_work(c67x00);
1154}
1155
1156void c67x00_sched_kick(struct c67x00_hcd *c67x00)
1157{
1158 tasklet_hi_schedule(&c67x00->tasklet);
1159}
1160
1161int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00)
1162{
1163 tasklet_init(&c67x00->tasklet, c67x00_sched_tasklet,
1164 (unsigned long)c67x00);
1165 return 0;
1166}
1167
1168void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00)
1169{
1170 tasklet_kill(&c67x00->tasklet);
1171}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * c67x00-sched.c: Cypress C67X00 USB Host Controller Driver - TD scheduling
4 *
5 * Copyright (C) 2006-2008 Barco N.V.
6 * Derived from the Cypress cy7c67200/300 ezusb linux driver and
7 * based on multiple host controller drivers inside the linux kernel.
8 */
9
10#include <linux/kthread.h>
11#include <linux/slab.h>
12
13#include "c67x00.h"
14#include "c67x00-hcd.h"
15
16/*
17 * These are the stages for a control urb, they are kept
18 * in both urb->interval and td->privdata.
19 */
20#define SETUP_STAGE 0
21#define DATA_STAGE 1
22#define STATUS_STAGE 2
23
24/* -------------------------------------------------------------------------- */
25
26/**
27 * struct c67x00_ep_data: Host endpoint data structure
28 */
29struct c67x00_ep_data {
30 struct list_head queue;
31 struct list_head node;
32 struct usb_host_endpoint *hep;
33 struct usb_device *dev;
34 u16 next_frame; /* For int/isoc transactions */
35};
36
37/**
38 * struct c67x00_td
39 *
40 * Hardware parts are little endiannes, SW in CPU endianess.
41 */
42struct c67x00_td {
43 /* HW specific part */
44 __le16 ly_base_addr; /* Bytes 0-1 */
45 __le16 port_length; /* Bytes 2-3 */
46 u8 pid_ep; /* Byte 4 */
47 u8 dev_addr; /* Byte 5 */
48 u8 ctrl_reg; /* Byte 6 */
49 u8 status; /* Byte 7 */
50 u8 retry_cnt; /* Byte 8 */
51#define TT_OFFSET 2
52#define TT_CONTROL 0
53#define TT_ISOCHRONOUS 1
54#define TT_BULK 2
55#define TT_INTERRUPT 3
56 u8 residue; /* Byte 9 */
57 __le16 next_td_addr; /* Bytes 10-11 */
58 /* SW part */
59 struct list_head td_list;
60 u16 td_addr;
61 void *data;
62 struct urb *urb;
63 unsigned long privdata;
64
65 /* These are needed for handling the toggle bits:
66 * an urb can be dequeued while a td is in progress
67 * after checking the td, the toggle bit might need to
68 * be fixed */
69 struct c67x00_ep_data *ep_data;
70 unsigned int pipe;
71};
72
73struct c67x00_urb_priv {
74 struct list_head hep_node;
75 struct urb *urb;
76 int port;
77 int cnt; /* packet number for isoc */
78 int status;
79 struct c67x00_ep_data *ep_data;
80};
81
82#define td_udev(td) ((td)->ep_data->dev)
83
84#define CY_TD_SIZE 12
85
86#define TD_PIDEP_OFFSET 0x04
87#define TD_PIDEPMASK_PID 0xF0
88#define TD_PIDEPMASK_EP 0x0F
89#define TD_PORTLENMASK_DL 0x03FF
90#define TD_PORTLENMASK_PN 0xC000
91
92#define TD_STATUS_OFFSET 0x07
93#define TD_STATUSMASK_ACK 0x01
94#define TD_STATUSMASK_ERR 0x02
95#define TD_STATUSMASK_TMOUT 0x04
96#define TD_STATUSMASK_SEQ 0x08
97#define TD_STATUSMASK_SETUP 0x10
98#define TD_STATUSMASK_OVF 0x20
99#define TD_STATUSMASK_NAK 0x40
100#define TD_STATUSMASK_STALL 0x80
101
102#define TD_ERROR_MASK (TD_STATUSMASK_ERR | TD_STATUSMASK_TMOUT | \
103 TD_STATUSMASK_STALL)
104
105#define TD_RETRYCNT_OFFSET 0x08
106#define TD_RETRYCNTMASK_ACT_FLG 0x10
107#define TD_RETRYCNTMASK_TX_TYPE 0x0C
108#define TD_RETRYCNTMASK_RTY_CNT 0x03
109
110#define TD_RESIDUE_OVERFLOW 0x80
111
112#define TD_PID_IN 0x90
113
114/* Residue: signed 8bits, neg -> OVERFLOW, pos -> UNDERFLOW */
115#define td_residue(td) ((__s8)(td->residue))
116#define td_ly_base_addr(td) (__le16_to_cpu((td)->ly_base_addr))
117#define td_port_length(td) (__le16_to_cpu((td)->port_length))
118#define td_next_td_addr(td) (__le16_to_cpu((td)->next_td_addr))
119
120#define td_active(td) ((td)->retry_cnt & TD_RETRYCNTMASK_ACT_FLG)
121#define td_length(td) (td_port_length(td) & TD_PORTLENMASK_DL)
122
123#define td_sequence_ok(td) (!td->status || \
124 (!(td->status & TD_STATUSMASK_SEQ) == \
125 !(td->ctrl_reg & SEQ_SEL)))
126
127#define td_acked(td) (!td->status || \
128 (td->status & TD_STATUSMASK_ACK))
129#define td_actual_bytes(td) (td_length(td) - td_residue(td))
130
131/* -------------------------------------------------------------------------- */
132
133/**
134 * dbg_td - Dump the contents of the TD
135 */
136static void dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg)
137{
138 struct device *dev = c67x00_hcd_dev(c67x00);
139
140 dev_dbg(dev, "### %s at 0x%04x\n", msg, td->td_addr);
141 dev_dbg(dev, "urb: 0x%p\n", td->urb);
142 dev_dbg(dev, "endpoint: %4d\n", usb_pipeendpoint(td->pipe));
143 dev_dbg(dev, "pipeout: %4d\n", usb_pipeout(td->pipe));
144 dev_dbg(dev, "ly_base_addr: 0x%04x\n", td_ly_base_addr(td));
145 dev_dbg(dev, "port_length: 0x%04x\n", td_port_length(td));
146 dev_dbg(dev, "pid_ep: 0x%02x\n", td->pid_ep);
147 dev_dbg(dev, "dev_addr: 0x%02x\n", td->dev_addr);
148 dev_dbg(dev, "ctrl_reg: 0x%02x\n", td->ctrl_reg);
149 dev_dbg(dev, "status: 0x%02x\n", td->status);
150 dev_dbg(dev, "retry_cnt: 0x%02x\n", td->retry_cnt);
151 dev_dbg(dev, "residue: 0x%02x\n", td->residue);
152 dev_dbg(dev, "next_td_addr: 0x%04x\n", td_next_td_addr(td));
153 dev_dbg(dev, "data: %*ph\n", td_length(td), td->data);
154}
155
156/* -------------------------------------------------------------------------- */
157/* Helper functions */
158
159static inline u16 c67x00_get_current_frame_number(struct c67x00_hcd *c67x00)
160{
161 return c67x00_ll_husb_get_frame(c67x00->sie) & HOST_FRAME_MASK;
162}
163
164/**
165 * frame_add
166 * Software wraparound for framenumbers.
167 */
168static inline u16 frame_add(u16 a, u16 b)
169{
170 return (a + b) & HOST_FRAME_MASK;
171}
172
173/**
174 * frame_after - is frame a after frame b
175 */
176static inline int frame_after(u16 a, u16 b)
177{
178 return ((HOST_FRAME_MASK + a - b) & HOST_FRAME_MASK) <
179 (HOST_FRAME_MASK / 2);
180}
181
182/**
183 * frame_after_eq - is frame a after or equal to frame b
184 */
185static inline int frame_after_eq(u16 a, u16 b)
186{
187 return ((HOST_FRAME_MASK + 1 + a - b) & HOST_FRAME_MASK) <
188 (HOST_FRAME_MASK / 2);
189}
190
191/* -------------------------------------------------------------------------- */
192
193/**
194 * c67x00_release_urb - remove link from all tds to this urb
195 * Disconnects the urb from it's tds, so that it can be given back.
196 * pre: urb->hcpriv != NULL
197 */
198static void c67x00_release_urb(struct c67x00_hcd *c67x00, struct urb *urb)
199{
200 struct c67x00_td *td;
201 struct c67x00_urb_priv *urbp;
202
203 BUG_ON(!urb);
204
205 c67x00->urb_count--;
206
207 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
208 c67x00->urb_iso_count--;
209 if (c67x00->urb_iso_count == 0)
210 c67x00->max_frame_bw = MAX_FRAME_BW_STD;
211 }
212
213 /* TODO this might be not so efficient when we've got many urbs!
214 * Alternatives:
215 * * only clear when needed
216 * * keep a list of tds with each urbp
217 */
218 list_for_each_entry(td, &c67x00->td_list, td_list)
219 if (urb == td->urb)
220 td->urb = NULL;
221
222 urbp = urb->hcpriv;
223 urb->hcpriv = NULL;
224 list_del(&urbp->hep_node);
225 kfree(urbp);
226}
227
228/* -------------------------------------------------------------------------- */
229
230static struct c67x00_ep_data *
231c67x00_ep_data_alloc(struct c67x00_hcd *c67x00, struct urb *urb)
232{
233 struct usb_host_endpoint *hep = urb->ep;
234 struct c67x00_ep_data *ep_data;
235 int type;
236
237 c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
238
239 /* Check if endpoint already has a c67x00_ep_data struct allocated */
240 if (hep->hcpriv) {
241 ep_data = hep->hcpriv;
242 if (frame_after(c67x00->current_frame, ep_data->next_frame))
243 ep_data->next_frame =
244 frame_add(c67x00->current_frame, 1);
245 return hep->hcpriv;
246 }
247
248 /* Allocate and initialize a new c67x00 endpoint data structure */
249 ep_data = kzalloc(sizeof(*ep_data), GFP_ATOMIC);
250 if (!ep_data)
251 return NULL;
252
253 INIT_LIST_HEAD(&ep_data->queue);
254 INIT_LIST_HEAD(&ep_data->node);
255 ep_data->hep = hep;
256
257 /* hold a reference to udev as long as this endpoint lives,
258 * this is needed to possibly fix the data toggle */
259 ep_data->dev = usb_get_dev(urb->dev);
260 hep->hcpriv = ep_data;
261
262 /* For ISOC and INT endpoints, start ASAP: */
263 ep_data->next_frame = frame_add(c67x00->current_frame, 1);
264
265 /* Add the endpoint data to one of the pipe lists; must be added
266 in order of endpoint address */
267 type = usb_pipetype(urb->pipe);
268 if (list_empty(&ep_data->node)) {
269 list_add(&ep_data->node, &c67x00->list[type]);
270 } else {
271 struct c67x00_ep_data *prev;
272
273 list_for_each_entry(prev, &c67x00->list[type], node) {
274 if (prev->hep->desc.bEndpointAddress >
275 hep->desc.bEndpointAddress) {
276 list_add(&ep_data->node, prev->node.prev);
277 break;
278 }
279 }
280 }
281
282 return ep_data;
283}
284
285static int c67x00_ep_data_free(struct usb_host_endpoint *hep)
286{
287 struct c67x00_ep_data *ep_data = hep->hcpriv;
288
289 if (!ep_data)
290 return 0;
291
292 if (!list_empty(&ep_data->queue))
293 return -EBUSY;
294
295 usb_put_dev(ep_data->dev);
296 list_del(&ep_data->queue);
297 list_del(&ep_data->node);
298
299 kfree(ep_data);
300 hep->hcpriv = NULL;
301
302 return 0;
303}
304
305void c67x00_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
306{
307 struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
308 unsigned long flags;
309
310 if (!list_empty(&ep->urb_list))
311 dev_warn(c67x00_hcd_dev(c67x00), "error: urb list not empty\n");
312
313 spin_lock_irqsave(&c67x00->lock, flags);
314
315 /* loop waiting for all transfers in the endpoint queue to complete */
316 while (c67x00_ep_data_free(ep)) {
317 /* Drop the lock so we can sleep waiting for the hardware */
318 spin_unlock_irqrestore(&c67x00->lock, flags);
319
320 /* it could happen that we reinitialize this completion, while
321 * somebody was waiting for that completion. The timeout and
322 * while loop handle such cases, but this might be improved */
323 reinit_completion(&c67x00->endpoint_disable);
324 c67x00_sched_kick(c67x00);
325 wait_for_completion_timeout(&c67x00->endpoint_disable, 1 * HZ);
326
327 spin_lock_irqsave(&c67x00->lock, flags);
328 }
329
330 spin_unlock_irqrestore(&c67x00->lock, flags);
331}
332
333/* -------------------------------------------------------------------------- */
334
335static inline int get_root_port(struct usb_device *dev)
336{
337 while (dev->parent->parent)
338 dev = dev->parent;
339 return dev->portnum;
340}
341
342int c67x00_urb_enqueue(struct usb_hcd *hcd,
343 struct urb *urb, gfp_t mem_flags)
344{
345 int ret;
346 unsigned long flags;
347 struct c67x00_urb_priv *urbp;
348 struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
349 int port = get_root_port(urb->dev)-1;
350
351 /* Allocate and initialize urb private data */
352 urbp = kzalloc(sizeof(*urbp), mem_flags);
353 if (!urbp) {
354 ret = -ENOMEM;
355 goto err_urbp;
356 }
357
358 spin_lock_irqsave(&c67x00->lock, flags);
359
360 /* Make sure host controller is running */
361 if (!HC_IS_RUNNING(hcd->state)) {
362 ret = -ENODEV;
363 goto err_not_linked;
364 }
365
366 ret = usb_hcd_link_urb_to_ep(hcd, urb);
367 if (ret)
368 goto err_not_linked;
369
370 INIT_LIST_HEAD(&urbp->hep_node);
371 urbp->urb = urb;
372 urbp->port = port;
373
374 urbp->ep_data = c67x00_ep_data_alloc(c67x00, urb);
375
376 if (!urbp->ep_data) {
377 ret = -ENOMEM;
378 goto err_epdata;
379 }
380
381 /* TODO claim bandwidth with usb_claim_bandwidth?
382 * also release it somewhere! */
383
384 urb->hcpriv = urbp;
385
386 urb->actual_length = 0; /* Nothing received/transmitted yet */
387
388 switch (usb_pipetype(urb->pipe)) {
389 case PIPE_CONTROL:
390 urb->interval = SETUP_STAGE;
391 break;
392 case PIPE_INTERRUPT:
393 break;
394 case PIPE_BULK:
395 break;
396 case PIPE_ISOCHRONOUS:
397 if (c67x00->urb_iso_count == 0)
398 c67x00->max_frame_bw = MAX_FRAME_BW_ISO;
399 c67x00->urb_iso_count++;
400 /* Assume always URB_ISO_ASAP, FIXME */
401 if (list_empty(&urbp->ep_data->queue))
402 urb->start_frame = urbp->ep_data->next_frame;
403 else {
404 /* Go right after the last one */
405 struct urb *last_urb;
406
407 last_urb = list_entry(urbp->ep_data->queue.prev,
408 struct c67x00_urb_priv,
409 hep_node)->urb;
410 urb->start_frame =
411 frame_add(last_urb->start_frame,
412 last_urb->number_of_packets *
413 last_urb->interval);
414 }
415 urbp->cnt = 0;
416 break;
417 }
418
419 /* Add the URB to the endpoint queue */
420 list_add_tail(&urbp->hep_node, &urbp->ep_data->queue);
421
422 /* If this is the only URB, kick start the controller */
423 if (!c67x00->urb_count++)
424 c67x00_ll_hpi_enable_sofeop(c67x00->sie);
425
426 c67x00_sched_kick(c67x00);
427 spin_unlock_irqrestore(&c67x00->lock, flags);
428
429 return 0;
430
431err_epdata:
432 usb_hcd_unlink_urb_from_ep(hcd, urb);
433err_not_linked:
434 spin_unlock_irqrestore(&c67x00->lock, flags);
435 kfree(urbp);
436err_urbp:
437
438 return ret;
439}
440
441int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
442{
443 struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
444 unsigned long flags;
445 int rc;
446
447 spin_lock_irqsave(&c67x00->lock, flags);
448 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
449 if (rc)
450 goto done;
451
452 c67x00_release_urb(c67x00, urb);
453 usb_hcd_unlink_urb_from_ep(hcd, urb);
454
455 spin_unlock(&c67x00->lock);
456 usb_hcd_giveback_urb(hcd, urb, status);
457 spin_lock(&c67x00->lock);
458
459 spin_unlock_irqrestore(&c67x00->lock, flags);
460
461 return 0;
462
463 done:
464 spin_unlock_irqrestore(&c67x00->lock, flags);
465 return rc;
466}
467
468/* -------------------------------------------------------------------------- */
469
470/*
471 * pre: c67x00 locked, urb unlocked
472 */
473static void
474c67x00_giveback_urb(struct c67x00_hcd *c67x00, struct urb *urb, int status)
475{
476 struct c67x00_urb_priv *urbp;
477
478 if (!urb)
479 return;
480
481 urbp = urb->hcpriv;
482 urbp->status = status;
483
484 list_del_init(&urbp->hep_node);
485
486 c67x00_release_urb(c67x00, urb);
487 usb_hcd_unlink_urb_from_ep(c67x00_hcd_to_hcd(c67x00), urb);
488 spin_unlock(&c67x00->lock);
489 usb_hcd_giveback_urb(c67x00_hcd_to_hcd(c67x00), urb, urbp->status);
490 spin_lock(&c67x00->lock);
491}
492
493/* -------------------------------------------------------------------------- */
494
495static int c67x00_claim_frame_bw(struct c67x00_hcd *c67x00, struct urb *urb,
496 int len, int periodic)
497{
498 struct c67x00_urb_priv *urbp = urb->hcpriv;
499 int bit_time;
500
501 /* According to the C67x00 BIOS user manual, page 3-18,19, the
502 * following calculations provide the full speed bit times for
503 * a transaction.
504 *
505 * FS(in) = 112.5 + 9.36*BC + HOST_DELAY
506 * FS(in,iso) = 90.5 + 9.36*BC + HOST_DELAY
507 * FS(out) = 112.5 + 9.36*BC + HOST_DELAY
508 * FS(out,iso) = 78.4 + 9.36*BC + HOST_DELAY
509 * LS(in) = 802.4 + 75.78*BC + HOST_DELAY
510 * LS(out) = 802.6 + 74.67*BC + HOST_DELAY
511 *
512 * HOST_DELAY == 106 for the c67200 and c67300.
513 */
514
515 /* make calculations in 1/100 bit times to maintain resolution */
516 if (urbp->ep_data->dev->speed == USB_SPEED_LOW) {
517 /* Low speed pipe */
518 if (usb_pipein(urb->pipe))
519 bit_time = 80240 + 7578*len;
520 else
521 bit_time = 80260 + 7467*len;
522 } else {
523 /* FS pipes */
524 if (usb_pipeisoc(urb->pipe))
525 bit_time = usb_pipein(urb->pipe) ? 9050 : 7840;
526 else
527 bit_time = 11250;
528 bit_time += 936*len;
529 }
530
531 /* Scale back down to integer bit times. Use a host delay of 106.
532 * (this is the only place it is used) */
533 bit_time = ((bit_time+50) / 100) + 106;
534
535 if (unlikely(bit_time + c67x00->bandwidth_allocated >=
536 c67x00->max_frame_bw))
537 return -EMSGSIZE;
538
539 if (unlikely(c67x00->next_td_addr + CY_TD_SIZE >=
540 c67x00->td_base_addr + SIE_TD_SIZE))
541 return -EMSGSIZE;
542
543 if (unlikely(c67x00->next_buf_addr + len >=
544 c67x00->buf_base_addr + SIE_TD_BUF_SIZE))
545 return -EMSGSIZE;
546
547 if (periodic) {
548 if (unlikely(bit_time + c67x00->periodic_bw_allocated >=
549 MAX_PERIODIC_BW(c67x00->max_frame_bw)))
550 return -EMSGSIZE;
551 c67x00->periodic_bw_allocated += bit_time;
552 }
553
554 c67x00->bandwidth_allocated += bit_time;
555 return 0;
556}
557
558/* -------------------------------------------------------------------------- */
559
560/**
561 * td_addr and buf_addr must be word aligned
562 */
563static int c67x00_create_td(struct c67x00_hcd *c67x00, struct urb *urb,
564 void *data, int len, int pid, int toggle,
565 unsigned long privdata)
566{
567 struct c67x00_td *td;
568 struct c67x00_urb_priv *urbp = urb->hcpriv;
569 const __u8 active_flag = 1, retry_cnt = 3;
570 __u8 cmd = 0;
571 int tt = 0;
572
573 if (c67x00_claim_frame_bw(c67x00, urb, len, usb_pipeisoc(urb->pipe)
574 || usb_pipeint(urb->pipe)))
575 return -EMSGSIZE; /* Not really an error, but expected */
576
577 td = kzalloc(sizeof(*td), GFP_ATOMIC);
578 if (!td)
579 return -ENOMEM;
580
581 td->pipe = urb->pipe;
582 td->ep_data = urbp->ep_data;
583
584 if ((td_udev(td)->speed == USB_SPEED_LOW) &&
585 !(c67x00->low_speed_ports & (1 << urbp->port)))
586 cmd |= PREAMBLE_EN;
587
588 switch (usb_pipetype(td->pipe)) {
589 case PIPE_ISOCHRONOUS:
590 tt = TT_ISOCHRONOUS;
591 cmd |= ISO_EN;
592 break;
593 case PIPE_CONTROL:
594 tt = TT_CONTROL;
595 break;
596 case PIPE_BULK:
597 tt = TT_BULK;
598 break;
599 case PIPE_INTERRUPT:
600 tt = TT_INTERRUPT;
601 break;
602 }
603
604 if (toggle)
605 cmd |= SEQ_SEL;
606
607 cmd |= ARM_EN;
608
609 /* SW part */
610 td->td_addr = c67x00->next_td_addr;
611 c67x00->next_td_addr = c67x00->next_td_addr + CY_TD_SIZE;
612
613 /* HW part */
614 td->ly_base_addr = __cpu_to_le16(c67x00->next_buf_addr);
615 td->port_length = __cpu_to_le16((c67x00->sie->sie_num << 15) |
616 (urbp->port << 14) | (len & 0x3FF));
617 td->pid_ep = ((pid & 0xF) << TD_PIDEP_OFFSET) |
618 (usb_pipeendpoint(td->pipe) & 0xF);
619 td->dev_addr = usb_pipedevice(td->pipe) & 0x7F;
620 td->ctrl_reg = cmd;
621 td->status = 0;
622 td->retry_cnt = (tt << TT_OFFSET) | (active_flag << 4) | retry_cnt;
623 td->residue = 0;
624 td->next_td_addr = __cpu_to_le16(c67x00->next_td_addr);
625
626 /* SW part */
627 td->data = data;
628 td->urb = urb;
629 td->privdata = privdata;
630
631 c67x00->next_buf_addr += (len + 1) & ~0x01; /* properly align */
632
633 list_add_tail(&td->td_list, &c67x00->td_list);
634 return 0;
635}
636
637static inline void c67x00_release_td(struct c67x00_td *td)
638{
639 list_del_init(&td->td_list);
640 kfree(td);
641}
642
643/* -------------------------------------------------------------------------- */
644
645static int c67x00_add_data_urb(struct c67x00_hcd *c67x00, struct urb *urb)
646{
647 int remaining;
648 int toggle;
649 int pid;
650 int ret = 0;
651 int maxps;
652 int need_empty;
653
654 toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
655 usb_pipeout(urb->pipe));
656 remaining = urb->transfer_buffer_length - urb->actual_length;
657
658 maxps = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
659
660 need_empty = (urb->transfer_flags & URB_ZERO_PACKET) &&
661 usb_pipeout(urb->pipe) && !(remaining % maxps);
662
663 while (remaining || need_empty) {
664 int len;
665 char *td_buf;
666
667 len = (remaining > maxps) ? maxps : remaining;
668 if (!len)
669 need_empty = 0;
670
671 pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
672 td_buf = urb->transfer_buffer + urb->transfer_buffer_length -
673 remaining;
674 ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, toggle,
675 DATA_STAGE);
676 if (ret)
677 return ret; /* td wasn't created */
678
679 toggle ^= 1;
680 remaining -= len;
681 if (usb_pipecontrol(urb->pipe))
682 break;
683 }
684
685 return 0;
686}
687
688/**
689 * return 0 in case more bandwidth is available, else errorcode
690 */
691static int c67x00_add_ctrl_urb(struct c67x00_hcd *c67x00, struct urb *urb)
692{
693 int ret;
694 int pid;
695
696 switch (urb->interval) {
697 default:
698 case SETUP_STAGE:
699 ret = c67x00_create_td(c67x00, urb, urb->setup_packet,
700 8, USB_PID_SETUP, 0, SETUP_STAGE);
701 if (ret)
702 return ret;
703 urb->interval = SETUP_STAGE;
704 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
705 usb_pipeout(urb->pipe), 1);
706 break;
707 case DATA_STAGE:
708 if (urb->transfer_buffer_length) {
709 ret = c67x00_add_data_urb(c67x00, urb);
710 if (ret)
711 return ret;
712 break;
713 } /* else fallthrough */
714 case STATUS_STAGE:
715 pid = !usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
716 ret = c67x00_create_td(c67x00, urb, NULL, 0, pid, 1,
717 STATUS_STAGE);
718 if (ret)
719 return ret;
720 break;
721 }
722
723 return 0;
724}
725
726/*
727 * return 0 in case more bandwidth is available, else errorcode
728 */
729static int c67x00_add_int_urb(struct c67x00_hcd *c67x00, struct urb *urb)
730{
731 struct c67x00_urb_priv *urbp = urb->hcpriv;
732
733 if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) {
734 urbp->ep_data->next_frame =
735 frame_add(urbp->ep_data->next_frame, urb->interval);
736 return c67x00_add_data_urb(c67x00, urb);
737 }
738 return 0;
739}
740
741static int c67x00_add_iso_urb(struct c67x00_hcd *c67x00, struct urb *urb)
742{
743 struct c67x00_urb_priv *urbp = urb->hcpriv;
744
745 if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) {
746 char *td_buf;
747 int len, pid, ret;
748
749 BUG_ON(urbp->cnt >= urb->number_of_packets);
750
751 td_buf = urb->transfer_buffer +
752 urb->iso_frame_desc[urbp->cnt].offset;
753 len = urb->iso_frame_desc[urbp->cnt].length;
754 pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
755
756 ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, 0,
757 urbp->cnt);
758 if (ret) {
759 dev_dbg(c67x00_hcd_dev(c67x00), "create failed: %d\n",
760 ret);
761 urb->iso_frame_desc[urbp->cnt].actual_length = 0;
762 urb->iso_frame_desc[urbp->cnt].status = ret;
763 if (urbp->cnt + 1 == urb->number_of_packets)
764 c67x00_giveback_urb(c67x00, urb, 0);
765 }
766
767 urbp->ep_data->next_frame =
768 frame_add(urbp->ep_data->next_frame, urb->interval);
769 urbp->cnt++;
770 }
771 return 0;
772}
773
774/* -------------------------------------------------------------------------- */
775
776static void c67x00_fill_from_list(struct c67x00_hcd *c67x00, int type,
777 int (*add)(struct c67x00_hcd *, struct urb *))
778{
779 struct c67x00_ep_data *ep_data;
780 struct urb *urb;
781
782 /* traverse every endpoint on the list */
783 list_for_each_entry(ep_data, &c67x00->list[type], node) {
784 if (!list_empty(&ep_data->queue)) {
785 /* and add the first urb */
786 /* isochronous transfer rely on this */
787 urb = list_entry(ep_data->queue.next,
788 struct c67x00_urb_priv,
789 hep_node)->urb;
790 add(c67x00, urb);
791 }
792 }
793}
794
795static void c67x00_fill_frame(struct c67x00_hcd *c67x00)
796{
797 struct c67x00_td *td, *ttd;
798
799 /* Check if we can proceed */
800 if (!list_empty(&c67x00->td_list)) {
801 dev_warn(c67x00_hcd_dev(c67x00),
802 "TD list not empty! This should not happen!\n");
803 list_for_each_entry_safe(td, ttd, &c67x00->td_list, td_list) {
804 dbg_td(c67x00, td, "Unprocessed td");
805 c67x00_release_td(td);
806 }
807 }
808
809 /* Reinitialize variables */
810 c67x00->bandwidth_allocated = 0;
811 c67x00->periodic_bw_allocated = 0;
812
813 c67x00->next_td_addr = c67x00->td_base_addr;
814 c67x00->next_buf_addr = c67x00->buf_base_addr;
815
816 /* Fill the list */
817 c67x00_fill_from_list(c67x00, PIPE_ISOCHRONOUS, c67x00_add_iso_urb);
818 c67x00_fill_from_list(c67x00, PIPE_INTERRUPT, c67x00_add_int_urb);
819 c67x00_fill_from_list(c67x00, PIPE_CONTROL, c67x00_add_ctrl_urb);
820 c67x00_fill_from_list(c67x00, PIPE_BULK, c67x00_add_data_urb);
821}
822
823/* -------------------------------------------------------------------------- */
824
825/**
826 * Get TD from C67X00
827 */
828static inline void
829c67x00_parse_td(struct c67x00_hcd *c67x00, struct c67x00_td *td)
830{
831 c67x00_ll_read_mem_le16(c67x00->sie->dev,
832 td->td_addr, td, CY_TD_SIZE);
833
834 if (usb_pipein(td->pipe) && td_actual_bytes(td))
835 c67x00_ll_read_mem_le16(c67x00->sie->dev, td_ly_base_addr(td),
836 td->data, td_actual_bytes(td));
837}
838
839static int c67x00_td_to_error(struct c67x00_hcd *c67x00, struct c67x00_td *td)
840{
841 if (td->status & TD_STATUSMASK_ERR) {
842 dbg_td(c67x00, td, "ERROR_FLAG");
843 return -EILSEQ;
844 }
845 if (td->status & TD_STATUSMASK_STALL) {
846 /* dbg_td(c67x00, td, "STALL"); */
847 return -EPIPE;
848 }
849 if (td->status & TD_STATUSMASK_TMOUT) {
850 dbg_td(c67x00, td, "TIMEOUT");
851 return -ETIMEDOUT;
852 }
853
854 return 0;
855}
856
857static inline int c67x00_end_of_data(struct c67x00_td *td)
858{
859 int maxps, need_empty, remaining;
860 struct urb *urb = td->urb;
861 int act_bytes;
862
863 act_bytes = td_actual_bytes(td);
864
865 if (unlikely(!act_bytes))
866 return 1; /* This was an empty packet */
867
868 maxps = usb_maxpacket(td_udev(td), td->pipe, usb_pipeout(td->pipe));
869
870 if (unlikely(act_bytes < maxps))
871 return 1; /* Smaller then full packet */
872
873 remaining = urb->transfer_buffer_length - urb->actual_length;
874 need_empty = (urb->transfer_flags & URB_ZERO_PACKET) &&
875 usb_pipeout(urb->pipe) && !(remaining % maxps);
876
877 if (unlikely(!remaining && !need_empty))
878 return 1;
879
880 return 0;
881}
882
883/* -------------------------------------------------------------------------- */
884
885/* Remove all td's from the list which come
886 * after last_td and are meant for the same pipe.
887 * This is used when a short packet has occurred */
888static inline void c67x00_clear_pipe(struct c67x00_hcd *c67x00,
889 struct c67x00_td *last_td)
890{
891 struct c67x00_td *td, *tmp;
892 td = last_td;
893 tmp = last_td;
894 while (td->td_list.next != &c67x00->td_list) {
895 td = list_entry(td->td_list.next, struct c67x00_td, td_list);
896 if (td->pipe == last_td->pipe) {
897 c67x00_release_td(td);
898 td = tmp;
899 }
900 tmp = td;
901 }
902}
903
904/* -------------------------------------------------------------------------- */
905
906static void c67x00_handle_successful_td(struct c67x00_hcd *c67x00,
907 struct c67x00_td *td)
908{
909 struct urb *urb = td->urb;
910
911 if (!urb)
912 return;
913
914 urb->actual_length += td_actual_bytes(td);
915
916 switch (usb_pipetype(td->pipe)) {
917 /* isochronous tds are handled separately */
918 case PIPE_CONTROL:
919 switch (td->privdata) {
920 case SETUP_STAGE:
921 urb->interval =
922 urb->transfer_buffer_length ?
923 DATA_STAGE : STATUS_STAGE;
924 /* Don't count setup_packet with normal data: */
925 urb->actual_length = 0;
926 break;
927
928 case DATA_STAGE:
929 if (c67x00_end_of_data(td)) {
930 urb->interval = STATUS_STAGE;
931 c67x00_clear_pipe(c67x00, td);
932 }
933 break;
934
935 case STATUS_STAGE:
936 urb->interval = 0;
937 c67x00_giveback_urb(c67x00, urb, 0);
938 break;
939 }
940 break;
941
942 case PIPE_INTERRUPT:
943 case PIPE_BULK:
944 if (unlikely(c67x00_end_of_data(td))) {
945 c67x00_clear_pipe(c67x00, td);
946 c67x00_giveback_urb(c67x00, urb, 0);
947 }
948 break;
949 }
950}
951
952static void c67x00_handle_isoc(struct c67x00_hcd *c67x00, struct c67x00_td *td)
953{
954 struct urb *urb = td->urb;
955 int cnt;
956
957 if (!urb)
958 return;
959
960 cnt = td->privdata;
961
962 if (td->status & TD_ERROR_MASK)
963 urb->error_count++;
964
965 urb->iso_frame_desc[cnt].actual_length = td_actual_bytes(td);
966 urb->iso_frame_desc[cnt].status = c67x00_td_to_error(c67x00, td);
967 if (cnt + 1 == urb->number_of_packets) /* Last packet */
968 c67x00_giveback_urb(c67x00, urb, 0);
969}
970
971/* -------------------------------------------------------------------------- */
972
973/**
974 * c67x00_check_td_list - handle tds which have been processed by the c67x00
975 * pre: current_td == 0
976 */
977static inline void c67x00_check_td_list(struct c67x00_hcd *c67x00)
978{
979 struct c67x00_td *td, *tmp;
980 struct urb *urb;
981 int ack_ok;
982 int clear_endpoint;
983
984 list_for_each_entry_safe(td, tmp, &c67x00->td_list, td_list) {
985 /* get the TD */
986 c67x00_parse_td(c67x00, td);
987 urb = td->urb; /* urb can be NULL! */
988 ack_ok = 0;
989 clear_endpoint = 1;
990
991 /* Handle isochronous transfers separately */
992 if (usb_pipeisoc(td->pipe)) {
993 clear_endpoint = 0;
994 c67x00_handle_isoc(c67x00, td);
995 goto cont;
996 }
997
998 /* When an error occurs, all td's for that pipe go into an
999 * inactive state. This state matches successful transfers so
1000 * we must make sure not to service them. */
1001 if (td->status & TD_ERROR_MASK) {
1002 c67x00_giveback_urb(c67x00, urb,
1003 c67x00_td_to_error(c67x00, td));
1004 goto cont;
1005 }
1006
1007 if ((td->status & TD_STATUSMASK_NAK) || !td_sequence_ok(td) ||
1008 !td_acked(td))
1009 goto cont;
1010
1011 /* Sequence ok and acked, don't need to fix toggle */
1012 ack_ok = 1;
1013
1014 if (unlikely(td->status & TD_STATUSMASK_OVF)) {
1015 if (td_residue(td) & TD_RESIDUE_OVERFLOW) {
1016 /* Overflow */
1017 c67x00_giveback_urb(c67x00, urb, -EOVERFLOW);
1018 goto cont;
1019 }
1020 }
1021
1022 clear_endpoint = 0;
1023 c67x00_handle_successful_td(c67x00, td);
1024
1025cont:
1026 if (clear_endpoint)
1027 c67x00_clear_pipe(c67x00, td);
1028 if (ack_ok)
1029 usb_settoggle(td_udev(td), usb_pipeendpoint(td->pipe),
1030 usb_pipeout(td->pipe),
1031 !(td->ctrl_reg & SEQ_SEL));
1032 /* next in list could have been removed, due to clear_pipe! */
1033 tmp = list_entry(td->td_list.next, typeof(*td), td_list);
1034 c67x00_release_td(td);
1035 }
1036}
1037
1038/* -------------------------------------------------------------------------- */
1039
1040static inline int c67x00_all_tds_processed(struct c67x00_hcd *c67x00)
1041{
1042 /* If all tds are processed, we can check the previous frame (if
1043 * there was any) and start our next frame.
1044 */
1045 return !c67x00_ll_husb_get_current_td(c67x00->sie);
1046}
1047
1048/**
1049 * Send td to C67X00
1050 */
1051static void c67x00_send_td(struct c67x00_hcd *c67x00, struct c67x00_td *td)
1052{
1053 int len = td_length(td);
1054
1055 if (len && ((td->pid_ep & TD_PIDEPMASK_PID) != TD_PID_IN))
1056 c67x00_ll_write_mem_le16(c67x00->sie->dev, td_ly_base_addr(td),
1057 td->data, len);
1058
1059 c67x00_ll_write_mem_le16(c67x00->sie->dev,
1060 td->td_addr, td, CY_TD_SIZE);
1061}
1062
1063static void c67x00_send_frame(struct c67x00_hcd *c67x00)
1064{
1065 struct c67x00_td *td;
1066
1067 if (list_empty(&c67x00->td_list))
1068 dev_warn(c67x00_hcd_dev(c67x00),
1069 "%s: td list should not be empty here!\n",
1070 __func__);
1071
1072 list_for_each_entry(td, &c67x00->td_list, td_list) {
1073 if (td->td_list.next == &c67x00->td_list)
1074 td->next_td_addr = 0; /* Last td in list */
1075
1076 c67x00_send_td(c67x00, td);
1077 }
1078
1079 c67x00_ll_husb_set_current_td(c67x00->sie, c67x00->td_base_addr);
1080}
1081
1082/* -------------------------------------------------------------------------- */
1083
1084/**
1085 * c67x00_do_work - Schedulers state machine
1086 */
1087static void c67x00_do_work(struct c67x00_hcd *c67x00)
1088{
1089 spin_lock(&c67x00->lock);
1090 /* Make sure all tds are processed */
1091 if (!c67x00_all_tds_processed(c67x00))
1092 goto out;
1093
1094 c67x00_check_td_list(c67x00);
1095
1096 /* no td's are being processed (current == 0)
1097 * and all have been "checked" */
1098 complete(&c67x00->endpoint_disable);
1099
1100 if (!list_empty(&c67x00->td_list))
1101 goto out;
1102
1103 c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
1104 if (c67x00->current_frame == c67x00->last_frame)
1105 goto out; /* Don't send tds in same frame */
1106 c67x00->last_frame = c67x00->current_frame;
1107
1108 /* If no urbs are scheduled, our work is done */
1109 if (!c67x00->urb_count) {
1110 c67x00_ll_hpi_disable_sofeop(c67x00->sie);
1111 goto out;
1112 }
1113
1114 c67x00_fill_frame(c67x00);
1115 if (!list_empty(&c67x00->td_list))
1116 /* TD's have been added to the frame */
1117 c67x00_send_frame(c67x00);
1118
1119 out:
1120 spin_unlock(&c67x00->lock);
1121}
1122
1123/* -------------------------------------------------------------------------- */
1124
1125static void c67x00_sched_tasklet(unsigned long __c67x00)
1126{
1127 struct c67x00_hcd *c67x00 = (struct c67x00_hcd *)__c67x00;
1128 c67x00_do_work(c67x00);
1129}
1130
1131void c67x00_sched_kick(struct c67x00_hcd *c67x00)
1132{
1133 tasklet_hi_schedule(&c67x00->tasklet);
1134}
1135
1136int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00)
1137{
1138 tasklet_init(&c67x00->tasklet, c67x00_sched_tasklet,
1139 (unsigned long)c67x00);
1140 return 0;
1141}
1142
1143void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00)
1144{
1145 tasklet_kill(&c67x00->tasklet);
1146}