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fhci-sched.c
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1 /*
2  * Freescale QUICC Engine USB Host Controller Driver
3  *
4  * Copyright (c) Freescale Semicondutor, Inc. 2006, 2011.
5  * Shlomi Gridish <[email protected]>
6  * Jerry Huang <[email protected]>
7  * Copyright (c) Logic Product Development, Inc. 2007
8  * Peter Barada <[email protected]>
9  * Copyright (c) MontaVista Software, Inc. 2008.
10  * Anton Vorontsov <[email protected]>
11  *
12  * This program is free software; you can redistribute it and/or modify it
13  * under the terms of the GNU General Public License as published by the
14  * Free Software Foundation; either version 2 of the License, or (at your
15  * option) any later version.
16  */
17 
18 #include <linux/kernel.h>
19 #include <linux/types.h>
20 #include <linux/spinlock.h>
21 #include <linux/delay.h>
22 #include <linux/errno.h>
23 #include <linux/list.h>
24 #include <linux/interrupt.h>
25 #include <linux/io.h>
26 #include <linux/usb.h>
27 #include <linux/usb/hcd.h>
28 #include <asm/qe.h>
29 #include <asm/fsl_gtm.h>
30 #include "fhci.h"
31 
32 static void recycle_frame(struct fhci_usb *usb, struct packet *pkt)
33 {
34  pkt->data = NULL;
35  pkt->len = 0;
36  pkt->status = USB_TD_OK;
37  pkt->info = 0;
38  pkt->priv_data = NULL;
39 
40  cq_put(&usb->ep0->empty_frame_Q, pkt);
41 }
42 
43 /* confirm submitted packet */
44 void fhci_transaction_confirm(struct fhci_usb *usb, struct packet *pkt)
45 {
46  struct td *td;
47  struct packet *td_pkt;
48  struct ed *ed;
49  u32 trans_len;
50  bool td_done = false;
51 
52  td = fhci_remove_td_from_frame(usb->actual_frame);
53  td_pkt = td->pkt;
54  trans_len = pkt->len;
55  td->status = pkt->status;
56  if (td->type == FHCI_TA_IN && td_pkt->info & PKT_DUMMY_PACKET) {
57  if ((td->data + td->actual_len) && trans_len)
58  memcpy(td->data + td->actual_len, pkt->data,
59  trans_len);
60  cq_put(&usb->ep0->dummy_packets_Q, pkt->data);
61  }
62 
63  recycle_frame(usb, pkt);
64 
65  ed = td->ed;
66  if (ed->mode == FHCI_TF_ISO) {
67  if (ed->td_list.next->next != &ed->td_list) {
68  struct td *td_next =
69  list_entry(ed->td_list.next->next, struct td,
70  node);
71 
72  td_next->start_frame = usb->actual_frame->frame_num;
73  }
74  td->actual_len = trans_len;
75  td_done = true;
76  } else if ((td->status & USB_TD_ERROR) &&
77  !(td->status & USB_TD_TX_ER_NAK)) {
78  /*
79  * There was an error on the transaction (but not NAK).
80  * If it is fatal error (data underrun, stall, bad pid or 3
81  * errors exceeded), mark this TD as done.
82  */
83  if ((td->status & USB_TD_RX_DATA_UNDERUN) ||
84  (td->status & USB_TD_TX_ER_STALL) ||
85  (td->status & USB_TD_RX_ER_PID) ||
86  (++td->error_cnt >= 3)) {
87  ed->state = FHCI_ED_HALTED;
88  td_done = true;
89 
90  if (td->status & USB_TD_RX_DATA_UNDERUN) {
91  fhci_dbg(usb->fhci, "td err fu\n");
92  td->toggle = !td->toggle;
93  td->actual_len += trans_len;
94  } else {
95  fhci_dbg(usb->fhci, "td err f!u\n");
96  }
97  } else {
98  fhci_dbg(usb->fhci, "td err !f\n");
99  /* it is not a fatal error -retry this transaction */
100  td->nak_cnt = 0;
101  td->error_cnt++;
102  td->status = USB_TD_OK;
103  }
104  } else if (td->status & USB_TD_TX_ER_NAK) {
105  /* there was a NAK response */
106  fhci_vdbg(usb->fhci, "td nack\n");
107  td->nak_cnt++;
108  td->error_cnt = 0;
109  td->status = USB_TD_OK;
110  } else {
111  /* there was no error on transaction */
112  td->error_cnt = 0;
113  td->nak_cnt = 0;
114  td->toggle = !td->toggle;
115  td->actual_len += trans_len;
116 
117  if (td->len == td->actual_len)
118  td_done = true;
119  }
120 
121  if (td_done)
122  fhci_move_td_from_ed_to_done_list(usb, ed);
123 }
124 
125 /*
126  * Flush all transmitted packets from BDs
127  * This routine is called when disabling the USB port to flush all
128  * transmissions that are already scheduled in the BDs
129  */
130 void fhci_flush_all_transmissions(struct fhci_usb *usb)
131 {
132  u8 mode;
133  struct td *td;
134 
135  mode = in_8(&usb->fhci->regs->usb_usmod);
136  clrbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);
137 
138  fhci_flush_bds(usb);
139 
140  while ((td = fhci_peek_td_from_frame(usb->actual_frame)) != NULL) {
141  struct packet *pkt = td->pkt;
142 
143  pkt->status = USB_TD_TX_ER_TIMEOUT;
144  fhci_transaction_confirm(usb, pkt);
145  }
146 
147  usb->actual_frame->frame_status = FRAME_END_TRANSMISSION;
148 
149  /* reset the event register */
150  out_be16(&usb->fhci->regs->usb_usber, 0xffff);
151  /* enable the USB controller */
152  out_8(&usb->fhci->regs->usb_usmod, mode | USB_MODE_EN);
153 }
154 
155 /*
156  * This function forms the packet and transmit the packet. This function
157  * will handle all endpoint type:ISO,interrupt,control and bulk
158  */
159 static int add_packet(struct fhci_usb *usb, struct ed *ed, struct td *td)
160 {
161  u32 fw_transaction_time, len = 0;
162  struct packet *pkt;
163  u8 *data = NULL;
164 
165  /* calcalate data address,len and toggle and then add the transaction */
166  if (td->toggle == USB_TD_TOGGLE_CARRY)
167  td->toggle = ed->toggle_carry;
168 
169  switch (ed->mode) {
170  case FHCI_TF_ISO:
171  len = td->len;
172  if (td->type != FHCI_TA_IN)
173  data = td->data;
174  break;
175  case FHCI_TF_CTRL:
176  case FHCI_TF_BULK:
177  len = min(td->len - td->actual_len, ed->max_pkt_size);
178  if (!((td->type == FHCI_TA_IN) &&
179  ((len + td->actual_len) == td->len)))
180  data = td->data + td->actual_len;
181  break;
182  case FHCI_TF_INTR:
183  len = min(td->len, ed->max_pkt_size);
184  if (!((td->type == FHCI_TA_IN) &&
185  ((td->len + CRC_SIZE) >= ed->max_pkt_size)))
186  data = td->data;
187  break;
188  default:
189  break;
190  }
191 
192  if (usb->port_status == FHCI_PORT_FULL)
193  fw_transaction_time = (((len + PROTOCOL_OVERHEAD) * 11) >> 4);
194  else
195  fw_transaction_time = ((len + PROTOCOL_OVERHEAD) * 6);
196 
197  /* check if there's enough space in this frame to submit this TD */
198  if (usb->actual_frame->total_bytes + len + PROTOCOL_OVERHEAD >=
199  usb->max_bytes_per_frame) {
200  fhci_vdbg(usb->fhci, "not enough space in this frame: "
201  "%d %d %d\n", usb->actual_frame->total_bytes, len,
202  usb->max_bytes_per_frame);
203  return -1;
204  }
205 
206  /* check if there's enough time in this frame to submit this TD */
207  if (usb->actual_frame->frame_status != FRAME_IS_PREPARED &&
208  (usb->actual_frame->frame_status & FRAME_END_TRANSMISSION ||
209  (fw_transaction_time + usb->sw_transaction_time >=
210  1000 - fhci_get_sof_timer_count(usb)))) {
211  fhci_dbg(usb->fhci, "not enough time in this frame\n");
212  return -1;
213  }
214 
215  /* update frame object fields before transmitting */
216  pkt = cq_get(&usb->ep0->empty_frame_Q);
217  if (!pkt) {
218  fhci_dbg(usb->fhci, "there is no empty frame\n");
219  return -1;
220  }
221  td->pkt = pkt;
222 
223  pkt->info = 0;
224  if (data == NULL) {
225  data = cq_get(&usb->ep0->dummy_packets_Q);
226  BUG_ON(!data);
227  pkt->info = PKT_DUMMY_PACKET;
228  }
229  pkt->data = data;
230  pkt->len = len;
231  pkt->status = USB_TD_OK;
232  /* update TD status field before transmitting */
233  td->status = USB_TD_INPROGRESS;
234  /* update actual frame time object with the actual transmission */
235  usb->actual_frame->total_bytes += (len + PROTOCOL_OVERHEAD);
236  fhci_add_td_to_frame(usb->actual_frame, td);
237 
238  if (usb->port_status != FHCI_PORT_FULL &&
239  usb->port_status != FHCI_PORT_LOW) {
240  pkt->status = USB_TD_TX_ER_TIMEOUT;
241  pkt->len = 0;
242  fhci_transaction_confirm(usb, pkt);
243  } else if (fhci_host_transaction(usb, pkt, td->type, ed->dev_addr,
244  ed->ep_addr, ed->mode, ed->speed, td->toggle)) {
245  /* remove TD from actual frame */
246  list_del_init(&td->frame_lh);
247  td->status = USB_TD_OK;
248  if (pkt->info & PKT_DUMMY_PACKET)
249  cq_put(&usb->ep0->dummy_packets_Q, pkt->data);
250  recycle_frame(usb, pkt);
251  usb->actual_frame->total_bytes -= (len + PROTOCOL_OVERHEAD);
252  fhci_err(usb->fhci, "host transaction failed\n");
253  return -1;
254  }
255 
256  return len;
257 }
258 
259 static void move_head_to_tail(struct list_head *list)
260 {
261  struct list_head *node = list->next;
262 
263  if (!list_empty(list)) {
264  list_move_tail(node, list);
265  }
266 }
267 
268 /*
269  * This function goes through the endpoint list and schedules the
270  * transactions within this list
271  */
272 static int scan_ed_list(struct fhci_usb *usb,
273  struct list_head *list, enum fhci_tf_mode list_type)
274 {
275  static const int frame_part[4] = {
276  [FHCI_TF_CTRL] = MAX_BYTES_PER_FRAME,
277  [FHCI_TF_ISO] = (MAX_BYTES_PER_FRAME *
278  MAX_PERIODIC_FRAME_USAGE) / 100,
279  [FHCI_TF_BULK] = MAX_BYTES_PER_FRAME,
280  [FHCI_TF_INTR] = (MAX_BYTES_PER_FRAME *
281  MAX_PERIODIC_FRAME_USAGE) / 100
282  };
283  struct ed *ed;
284  struct td *td;
285  int ans = 1;
286  u32 save_transaction_time = usb->sw_transaction_time;
287 
288  list_for_each_entry(ed, list, node) {
289  td = ed->td_head;
290 
291  if (!td || (td && td->status == USB_TD_INPROGRESS))
292  continue;
293 
294  if (ed->state != FHCI_ED_OPER) {
295  if (ed->state == FHCI_ED_URB_DEL) {
296  td->status = USB_TD_OK;
297  fhci_move_td_from_ed_to_done_list(usb, ed);
298  ed->state = FHCI_ED_SKIP;
299  }
300  continue;
301  }
302 
303  /*
304  * if it isn't interrupt pipe or it is not iso pipe and the
305  * interval time passed
306  */
307  if ((list_type == FHCI_TF_INTR || list_type == FHCI_TF_ISO) &&
308  (((usb->actual_frame->frame_num -
309  td->start_frame) & 0x7ff) < td->interval))
310  continue;
311 
312  if (add_packet(usb, ed, td) < 0)
313  continue;
314 
315  /* update time stamps in the TD */
316  td->start_frame = usb->actual_frame->frame_num;
317  usb->sw_transaction_time += save_transaction_time;
318 
319  if (usb->actual_frame->total_bytes >=
320  usb->max_bytes_per_frame) {
321  usb->actual_frame->frame_status =
322  FRAME_DATA_END_TRANSMISSION;
323  fhci_push_dummy_bd(usb->ep0);
324  ans = 0;
325  break;
326  }
327 
328  if (usb->actual_frame->total_bytes >= frame_part[list_type])
329  break;
330  }
331 
332  /* be fair to each ED(move list head around) */
333  move_head_to_tail(list);
334  usb->sw_transaction_time = save_transaction_time;
335 
336  return ans;
337 }
338 
339 static u32 rotate_frames(struct fhci_usb *usb)
340 {
341  struct fhci_hcd *fhci = usb->fhci;
342 
343  if (!list_empty(&usb->actual_frame->tds_list)) {
344  if ((((in_be16(&fhci->pram->frame_num) & 0x07ff) -
345  usb->actual_frame->frame_num) & 0x7ff) > 5)
346  fhci_flush_actual_frame(usb);
347  else
348  return -EINVAL;
349  }
350 
351  usb->actual_frame->frame_status = FRAME_IS_PREPARED;
352  usb->actual_frame->frame_num = in_be16(&fhci->pram->frame_num) & 0x7ff;
353  usb->actual_frame->total_bytes = 0;
354 
355  return 0;
356 }
357 
358 /*
359  * This function schedule the USB transaction and will process the
360  * endpoint in the following order: iso, interrupt, control and bulk.
361  */
362 void fhci_schedule_transactions(struct fhci_usb *usb)
363 {
364  int left = 1;
365 
366  if (usb->actual_frame->frame_status & FRAME_END_TRANSMISSION)
367  if (rotate_frames(usb) != 0)
368  return;
369 
370  if (usb->actual_frame->frame_status & FRAME_END_TRANSMISSION)
371  return;
372 
373  if (usb->actual_frame->total_bytes == 0) {
374  /*
375  * schedule the next available ISO transfer
376  *or next stage of the ISO transfer
377  */
378  scan_ed_list(usb, &usb->hc_list->iso_list, FHCI_TF_ISO);
379 
380  /*
381  * schedule the next available interrupt transfer or
382  * the next stage of the interrupt transfer
383  */
384  scan_ed_list(usb, &usb->hc_list->intr_list, FHCI_TF_INTR);
385 
386  /*
387  * schedule the next available control transfer
388  * or the next stage of the control transfer
389  */
390  left = scan_ed_list(usb, &usb->hc_list->ctrl_list,
391  FHCI_TF_CTRL);
392  }
393 
394  /*
395  * schedule the next available bulk transfer or the next stage of the
396  * bulk transfer
397  */
398  if (left > 0)
399  scan_ed_list(usb, &usb->hc_list->bulk_list, FHCI_TF_BULK);
400 }
401 
402 /* Handles SOF interrupt */
403 static void sof_interrupt(struct fhci_hcd *fhci)
404 {
405  struct fhci_usb *usb = fhci->usb_lld;
406 
407  if ((usb->port_status == FHCI_PORT_DISABLED) &&
408  (usb->vroot_hub->port.wPortStatus & USB_PORT_STAT_CONNECTION) &&
409  !(usb->vroot_hub->port.wPortChange & USB_PORT_STAT_C_CONNECTION)) {
410  if (usb->vroot_hub->port.wPortStatus & USB_PORT_STAT_LOW_SPEED)
411  usb->port_status = FHCI_PORT_LOW;
412  else
413  usb->port_status = FHCI_PORT_FULL;
414  /* Disable IDLE */
415  usb->saved_msk &= ~USB_E_IDLE_MASK;
416  out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
417  }
418 
419  gtm_set_exact_timer16(fhci->timer, usb->max_frame_usage, false);
420 
421  fhci_host_transmit_actual_frame(usb);
422  usb->actual_frame->frame_status = FRAME_IS_TRANSMITTED;
423 
424  fhci_schedule_transactions(usb);
425 }
426 
427 /* Handles device disconnected interrupt on port */
428 void fhci_device_disconnected_interrupt(struct fhci_hcd *fhci)
429 {
430  struct fhci_usb *usb = fhci->usb_lld;
431 
432  fhci_dbg(fhci, "-> %s\n", __func__);
433 
434  fhci_usb_disable_interrupt(usb);
435  clrbits8(&usb->fhci->regs->usb_usmod, USB_MODE_LSS);
436  usb->port_status = FHCI_PORT_DISABLED;
437 
438  fhci_stop_sof_timer(fhci);
439 
440  /* Enable IDLE since we want to know if something comes along */
441  usb->saved_msk |= USB_E_IDLE_MASK;
442  out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
443 
444  usb->vroot_hub->port.wPortStatus &= ~USB_PORT_STAT_CONNECTION;
445  usb->vroot_hub->port.wPortChange |= USB_PORT_STAT_C_CONNECTION;
446  usb->max_bytes_per_frame = 0;
447  fhci_usb_enable_interrupt(usb);
448 
449  fhci_dbg(fhci, "<- %s\n", __func__);
450 }
451 
452 /* detect a new device connected on the USB port */
453 void fhci_device_connected_interrupt(struct fhci_hcd *fhci)
454 {
455 
456  struct fhci_usb *usb = fhci->usb_lld;
457  int state;
458  int ret;
459 
460  fhci_dbg(fhci, "-> %s\n", __func__);
461 
462  fhci_usb_disable_interrupt(usb);
463  state = fhci_ioports_check_bus_state(fhci);
464 
465  /* low-speed device was connected to the USB port */
466  if (state == 1) {
467  ret = qe_usb_clock_set(fhci->lowspeed_clk, USB_CLOCK >> 3);
468  if (ret) {
469  fhci_warn(fhci, "Low-Speed device is not supported, "
470  "try use BRGx\n");
471  goto out;
472  }
473 
474  usb->port_status = FHCI_PORT_LOW;
475  setbits8(&usb->fhci->regs->usb_usmod, USB_MODE_LSS);
476  usb->vroot_hub->port.wPortStatus |=
477  (USB_PORT_STAT_LOW_SPEED |
478  USB_PORT_STAT_CONNECTION);
479  usb->vroot_hub->port.wPortChange |=
480  USB_PORT_STAT_C_CONNECTION;
481  usb->max_bytes_per_frame =
482  (MAX_BYTES_PER_FRAME >> 3) - 7;
483  fhci_port_enable(usb);
484  } else if (state == 2) {
485  ret = qe_usb_clock_set(fhci->fullspeed_clk, USB_CLOCK);
486  if (ret) {
487  fhci_warn(fhci, "Full-Speed device is not supported, "
488  "try use CLKx\n");
489  goto out;
490  }
491 
492  usb->port_status = FHCI_PORT_FULL;
493  clrbits8(&usb->fhci->regs->usb_usmod, USB_MODE_LSS);
494  usb->vroot_hub->port.wPortStatus &=
495  ~USB_PORT_STAT_LOW_SPEED;
496  usb->vroot_hub->port.wPortStatus |=
497  USB_PORT_STAT_CONNECTION;
498  usb->vroot_hub->port.wPortChange |=
499  USB_PORT_STAT_C_CONNECTION;
500  usb->max_bytes_per_frame = (MAX_BYTES_PER_FRAME - 15);
501  fhci_port_enable(usb);
502  }
503 out:
504  fhci_usb_enable_interrupt(usb);
505  fhci_dbg(fhci, "<- %s\n", __func__);
506 }
507 
508 irqreturn_t fhci_frame_limit_timer_irq(int irq, void *_hcd)
509 {
510  struct usb_hcd *hcd = _hcd;
511  struct fhci_hcd *fhci = hcd_to_fhci(hcd);
512  struct fhci_usb *usb = fhci->usb_lld;
513 
514  spin_lock(&fhci->lock);
515 
516  gtm_set_exact_timer16(fhci->timer, 1000, false);
517 
518  if (usb->actual_frame->frame_status == FRAME_IS_TRANSMITTED) {
519  usb->actual_frame->frame_status = FRAME_TIMER_END_TRANSMISSION;
520  fhci_push_dummy_bd(usb->ep0);
521  }
522 
523  fhci_schedule_transactions(usb);
524 
525  spin_unlock(&fhci->lock);
526 
527  return IRQ_HANDLED;
528 }
529 
530 /* Cancel transmission on the USB endpoint */
531 static void abort_transmission(struct fhci_usb *usb)
532 {
533  fhci_dbg(usb->fhci, "-> %s\n", __func__);
534  /* issue stop Tx command */
535  qe_issue_cmd(QE_USB_STOP_TX, QE_CR_SUBBLOCK_USB, EP_ZERO, 0);
536  /* flush Tx FIFOs */
537  out_8(&usb->fhci->regs->usb_uscom, USB_CMD_FLUSH_FIFO | EP_ZERO);
538  udelay(1000);
539  /* reset Tx BDs */
540  fhci_flush_bds(usb);
541  /* issue restart Tx command */
542  qe_issue_cmd(QE_USB_RESTART_TX, QE_CR_SUBBLOCK_USB, EP_ZERO, 0);
543  fhci_dbg(usb->fhci, "<- %s\n", __func__);
544 }
545 
546 irqreturn_t fhci_irq(struct usb_hcd *hcd)
547 {
548  struct fhci_hcd *fhci = hcd_to_fhci(hcd);
549  struct fhci_usb *usb;
550  u16 usb_er = 0;
551  unsigned long flags;
552 
553  spin_lock_irqsave(&fhci->lock, flags);
554 
555  usb = fhci->usb_lld;
556 
557  usb_er |= in_be16(&usb->fhci->regs->usb_usber) &
558  in_be16(&usb->fhci->regs->usb_usbmr);
559 
560  /* clear event bits for next time */
561  out_be16(&usb->fhci->regs->usb_usber, usb_er);
562 
563  fhci_dbg_isr(fhci, usb_er);
564 
565  if (usb_er & USB_E_RESET_MASK) {
566  if ((usb->port_status == FHCI_PORT_FULL) ||
567  (usb->port_status == FHCI_PORT_LOW)) {
568  fhci_device_disconnected_interrupt(fhci);
569  usb_er &= ~USB_E_IDLE_MASK;
570  } else if (usb->port_status == FHCI_PORT_WAITING) {
571  usb->port_status = FHCI_PORT_DISCONNECTING;
572 
573  /* Turn on IDLE since we want to disconnect */
574  usb->saved_msk |= USB_E_IDLE_MASK;
575  out_be16(&usb->fhci->regs->usb_usber,
576  usb->saved_msk);
577  } else if (usb->port_status == FHCI_PORT_DISABLED) {
578  if (fhci_ioports_check_bus_state(fhci) == 1)
579  fhci_device_connected_interrupt(fhci);
580  }
581  usb_er &= ~USB_E_RESET_MASK;
582  }
583 
584  if (usb_er & USB_E_MSF_MASK) {
585  abort_transmission(fhci->usb_lld);
586  usb_er &= ~USB_E_MSF_MASK;
587  }
588 
589  if (usb_er & (USB_E_SOF_MASK | USB_E_SFT_MASK)) {
590  sof_interrupt(fhci);
591  usb_er &= ~(USB_E_SOF_MASK | USB_E_SFT_MASK);
592  }
593 
594  if (usb_er & USB_E_TXB_MASK) {
595  fhci_tx_conf_interrupt(fhci->usb_lld);
596  usb_er &= ~USB_E_TXB_MASK;
597  }
598 
599  if (usb_er & USB_E_TXE1_MASK) {
600  fhci_tx_conf_interrupt(fhci->usb_lld);
601  usb_er &= ~USB_E_TXE1_MASK;
602  }
603 
604  if (usb_er & USB_E_IDLE_MASK) {
605  if (usb->port_status == FHCI_PORT_DISABLED) {
606  usb_er &= ~USB_E_RESET_MASK;
607  fhci_device_connected_interrupt(fhci);
608  } else if (usb->port_status ==
609  FHCI_PORT_DISCONNECTING) {
610  /* XXX usb->port_status = FHCI_PORT_WAITING; */
611  /* Disable IDLE */
612  usb->saved_msk &= ~USB_E_IDLE_MASK;
613  out_be16(&usb->fhci->regs->usb_usbmr,
614  usb->saved_msk);
615  } else {
616  fhci_dbg_isr(fhci, -1);
617  }
618 
619  usb_er &= ~USB_E_IDLE_MASK;
620  }
621 
622  spin_unlock_irqrestore(&fhci->lock, flags);
623 
624  return IRQ_HANDLED;
625 }
626 
627 
628 /*
629  * Process normal completions(error or success) and clean the schedule.
630  *
631  * This is the main path for handing urbs back to drivers. The only other patth
632  * is process_del_list(),which unlinks URBs by scanning EDs,instead of scanning
633  * the (re-reversed) done list as this does.
634  */
635 static void process_done_list(unsigned long data)
636 {
637  struct urb *urb;
638  struct ed *ed;
639  struct td *td;
640  struct urb_priv *urb_priv;
641  struct fhci_hcd *fhci = (struct fhci_hcd *)data;
642 
643  disable_irq(fhci->timer->irq);
644  disable_irq(fhci_to_hcd(fhci)->irq);
645  spin_lock(&fhci->lock);
646 
647  td = fhci_remove_td_from_done_list(fhci->hc_list);
648  while (td != NULL) {
649  urb = td->urb;
650  urb_priv = urb->hcpriv;
651  ed = td->ed;
652 
653  /* update URB's length and status from TD */
654  fhci_done_td(urb, td);
655  urb_priv->tds_cnt++;
656 
657  /*
658  * if all this urb's TDs are done, call complete()
659  * Interrupt transfers are the onley special case:
660  * they are reissued,until "deleted" by usb_unlink_urb
661  * (real work done in a SOF intr, by process_del_list)
662  */
663  if (urb_priv->tds_cnt == urb_priv->num_of_tds) {
664  fhci_urb_complete_free(fhci, urb);
665  } else if (urb_priv->state == URB_DEL &&
666  ed->state == FHCI_ED_SKIP) {
667  fhci_del_ed_list(fhci, ed);
668  ed->state = FHCI_ED_OPER;
669  } else if (ed->state == FHCI_ED_HALTED) {
670  urb_priv->state = URB_DEL;
671  ed->state = FHCI_ED_URB_DEL;
672  fhci_del_ed_list(fhci, ed);
673  ed->state = FHCI_ED_OPER;
674  }
675 
676  td = fhci_remove_td_from_done_list(fhci->hc_list);
677  }
678 
679  spin_unlock(&fhci->lock);
680  enable_irq(fhci->timer->irq);
681  enable_irq(fhci_to_hcd(fhci)->irq);
682 }
683 
684 DECLARE_TASKLET(fhci_tasklet, process_done_list, 0);
685 
686 /* transfer complted callback */
687 u32 fhci_transfer_confirm_callback(struct fhci_hcd *fhci)
688 {
689  if (!fhci->process_done_task->state)
690  tasklet_schedule(fhci->process_done_task);
691  return 0;
692 }
693 
694 /*
695  * adds urb to the endpoint descriptor list
696  * arguments:
697  * fhci data structure for the Low level host controller
698  * ep USB Host endpoint data structure
699  * urb USB request block data structure
700  */
701 void fhci_queue_urb(struct fhci_hcd *fhci, struct urb *urb)
702 {
703  struct ed *ed = urb->ep->hcpriv;
704  struct urb_priv *urb_priv = urb->hcpriv;
705  u32 data_len = urb->transfer_buffer_length;
706  int urb_state = 0;
707  int toggle = 0;
708  struct td *td;
709  u8 *data;
710  u16 cnt = 0;
711 
712  if (ed == NULL) {
713  ed = fhci_get_empty_ed(fhci);
714  ed->dev_addr = usb_pipedevice(urb->pipe);
715  ed->ep_addr = usb_pipeendpoint(urb->pipe);
716  switch (usb_pipetype(urb->pipe)) {
717  case PIPE_CONTROL:
718  ed->mode = FHCI_TF_CTRL;
719  break;
720  case PIPE_BULK:
721  ed->mode = FHCI_TF_BULK;
722  break;
723  case PIPE_INTERRUPT:
724  ed->mode = FHCI_TF_INTR;
725  break;
726  case PIPE_ISOCHRONOUS:
727  ed->mode = FHCI_TF_ISO;
728  break;
729  default:
730  break;
731  }
732  ed->speed = (urb->dev->speed == USB_SPEED_LOW) ?
733  FHCI_LOW_SPEED : FHCI_FULL_SPEED;
734  ed->max_pkt_size = usb_maxpacket(urb->dev,
735  urb->pipe, usb_pipeout(urb->pipe));
736  urb->ep->hcpriv = ed;
737  fhci_dbg(fhci, "new ep speed=%d max_pkt_size=%d\n",
738  ed->speed, ed->max_pkt_size);
739  }
740 
741  /* for ISO transfer calculate start frame index */
742  if (ed->mode == FHCI_TF_ISO && urb->transfer_flags & URB_ISO_ASAP)
743  urb->start_frame = ed->td_head ? ed->last_iso + 1 :
744  get_frame_num(fhci);
745 
746  /*
747  * OHCI handles the DATA toggle itself,we just use the USB
748  * toggle bits
749  */
750  if (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
751  usb_pipeout(urb->pipe)))
752  toggle = USB_TD_TOGGLE_CARRY;
753  else {
754  toggle = USB_TD_TOGGLE_DATA0;
755  usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
756  usb_pipeout(urb->pipe), 1);
757  }
758 
759  urb_priv->tds_cnt = 0;
760  urb_priv->ed = ed;
761  if (data_len > 0)
762  data = urb->transfer_buffer;
763  else
764  data = NULL;
765 
766  switch (ed->mode) {
767  case FHCI_TF_BULK:
768  if (urb->transfer_flags & URB_ZERO_PACKET &&
769  urb->transfer_buffer_length > 0 &&
770  ((urb->transfer_buffer_length %
771  usb_maxpacket(urb->dev, urb->pipe,
772  usb_pipeout(urb->pipe))) == 0))
773  urb_state = US_BULK0;
774  while (data_len > 4096) {
775  td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
776  usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
777  FHCI_TA_IN,
778  cnt ? USB_TD_TOGGLE_CARRY :
779  toggle,
780  data, 4096, 0, 0, true);
781  data += 4096;
782  data_len -= 4096;
783  cnt++;
784  }
785 
786  td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
787  usb_pipeout(urb->pipe) ? FHCI_TA_OUT : FHCI_TA_IN,
788  cnt ? USB_TD_TOGGLE_CARRY : toggle,
789  data, data_len, 0, 0, true);
790  cnt++;
791 
792  if (urb->transfer_flags & URB_ZERO_PACKET &&
793  cnt < urb_priv->num_of_tds) {
794  td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
795  usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
796  FHCI_TA_IN,
797  USB_TD_TOGGLE_CARRY, NULL, 0, 0, 0, true);
798  cnt++;
799  }
800  break;
801  case FHCI_TF_INTR:
802  urb->start_frame = get_frame_num(fhci) + 1;
803  td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
804  usb_pipeout(urb->pipe) ? FHCI_TA_OUT : FHCI_TA_IN,
805  USB_TD_TOGGLE_DATA0, data, data_len,
806  urb->interval, urb->start_frame, true);
807  break;
808  case FHCI_TF_CTRL:
809  ed->dev_addr = usb_pipedevice(urb->pipe);
810  ed->max_pkt_size = usb_maxpacket(urb->dev, urb->pipe,
811  usb_pipeout(urb->pipe));
812  /* setup stage */
813  td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++, FHCI_TA_SETUP,
814  USB_TD_TOGGLE_DATA0, urb->setup_packet, 8, 0, 0, true);
815 
816  /* data stage */
817  if (data_len > 0) {
818  td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
819  usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
820  FHCI_TA_IN,
821  USB_TD_TOGGLE_DATA1, data, data_len, 0, 0,
822  true);
823  }
824 
825  /* status stage */
826  if (data_len > 0)
827  td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
828  (usb_pipeout(urb->pipe) ? FHCI_TA_IN :
829  FHCI_TA_OUT),
830  USB_TD_TOGGLE_DATA1, data, 0, 0, 0, true);
831  else
832  td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
833  FHCI_TA_IN,
834  USB_TD_TOGGLE_DATA1, data, 0, 0, 0, true);
835 
836  urb_state = US_CTRL_SETUP;
837  break;
838  case FHCI_TF_ISO:
839  for (cnt = 0; cnt < urb->number_of_packets; cnt++) {
840  u16 frame = urb->start_frame;
841 
842  /*
843  * FIXME scheduling should handle frame counter
844  * roll-around ... exotic case (and OHCI has
845  * a 2^16 iso range, vs other HCs max of 2^10)
846  */
847  frame += cnt * urb->interval;
848  frame &= 0x07ff;
849  td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
850  usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
851  FHCI_TA_IN,
852  USB_TD_TOGGLE_DATA0,
853  data + urb->iso_frame_desc[cnt].offset,
854  urb->iso_frame_desc[cnt].length,
855  urb->interval, frame, true);
856  }
857  break;
858  default:
859  break;
860  }
861 
862  /*
863  * set the state of URB
864  * control pipe:3 states -- setup,data,status
865  * interrupt and bulk pipe:1 state -- data
866  */
867  urb->pipe &= ~0x1f;
868  urb->pipe |= urb_state & 0x1f;
869 
870  urb_priv->state = URB_INPROGRESS;
871 
872  if (!ed->td_head) {
873  ed->state = FHCI_ED_OPER;
874  switch (ed->mode) {
875  case FHCI_TF_CTRL:
876  list_add(&ed->node, &fhci->hc_list->ctrl_list);
877  break;
878  case FHCI_TF_BULK:
879  list_add(&ed->node, &fhci->hc_list->bulk_list);
880  break;
881  case FHCI_TF_INTR:
882  list_add(&ed->node, &fhci->hc_list->intr_list);
883  break;
884  case FHCI_TF_ISO:
885  list_add(&ed->node, &fhci->hc_list->iso_list);
886  break;
887  default:
888  break;
889  }
890  }
891 
892  fhci_add_tds_to_ed(ed, urb_priv->tds, urb_priv->num_of_tds);
893  fhci->active_urbs++;
894 }
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