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Adds a nolock function to the w1 interface to avoid locking the
[linux-2.6/next.git] / drivers / usb / c67x00 / c67x00-sched.c
bloba03fbc15fa9cce3ed28f209380f2a091e73223c7
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 */
43 struct 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 */
56 struct 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
87 struct 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 */
152 static 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
175 static inline void
176 dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg) { }
177
178 #endif /* DEBUG */
179
180 /* -------------------------------------------------------------------------- */
181 /* Helper functions */
182
183 static 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 */
192 static 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 */
200 static 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 */
209 static 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 */
222 static 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
254 static struct c67x00_ep_data *
255 c67x00_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
309 static 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
329 void 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
359 static 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
366 int 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
455 err_epdata:
456 kfree(urbp);
457 err_urbp:
458 usb_hcd_unlink_urb_from_ep(hcd, urb);
459 err_not_linked:
460 spin_unlock_irqrestore(&c67x00->lock, flags);
461
462 return ret;
463 }
464
465 int 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 */
497 static void
498 c67x00_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
519 static 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 */
587 static 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
661 static inline void c67x00_release_td(struct c67x00_td *td)
662 {
663 list_del_init(&td->td_list);
664 kfree(td);
665 }
666
667 /* -------------------------------------------------------------------------- */
668
669 static 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 */
715 static 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 */
753 static 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
765 static 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
799 static 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
818 static 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 */
851 static inline void
852 c67x00_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
862 static 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
880 static 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 */
911 static 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
929 static 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
975 static 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 */
1002 static 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
1050 cont:
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
1065 static 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 */
1076 static 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
1088 static 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 */
1112 static 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
1150 static void c67x00_sched_tasklet(unsigned long __c67x00)
1151 {
1152 struct c67x00_hcd *c67x00 = (struct c67x00_hcd *)__c67x00;
1153 c67x00_do_work(c67x00);
1154 }
1155
1156 void c67x00_sched_kick(struct c67x00_hcd *c67x00)
1157 {
1158 tasklet_hi_schedule(&c67x00->tasklet);
1159 }
1160
1161 int 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
1168 void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00)
1169 {
1170 tasklet_kill(&c67x00->tasklet);
1171 }
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