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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / usb / host / fhci-sched.c
blob2df851b4bc7c1c474acdc65dc6e8143f38dbf7d1
1 /*
2 * Freescale QUICC Engine USB Host Controller Driver
3 *
4 * Copyright (c) Freescale Semicondutor, Inc. 2006, 2011.
5 * Shlomi Gridish <gridish@freescale.com>
6 * Jerry Huang <Chang-Ming.Huang@freescale.com>
7 * Copyright (c) Logic Product Development, Inc. 2007
8 * Peter Barada <peterb@logicpd.com>
9 * Copyright (c) MontaVista Software, Inc. 2008.
10 * Anton Vorontsov <avorontsov@ru.mvista.com>
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_mod);
136 clrbits8(&usb->fhci->regs->usb_mod, 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_event, 0xffff);
151 /* enable the USB controller */
152 out_8(&usb->fhci->regs->usb_mod, 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_del(node);
265 list_add_tail(node, list);
266 }
267 }
268
269 /*
270 * This function goes through the endpoint list and schedules the
271 * transactions within this list
272 */
273 static int scan_ed_list(struct fhci_usb *usb,
274 struct list_head *list, enum fhci_tf_mode list_type)
275 {
276 static const int frame_part[4] = {
277 [FHCI_TF_CTRL] = MAX_BYTES_PER_FRAME,
278 [FHCI_TF_ISO] = (MAX_BYTES_PER_FRAME *
279 MAX_PERIODIC_FRAME_USAGE) / 100,
280 [FHCI_TF_BULK] = MAX_BYTES_PER_FRAME,
281 [FHCI_TF_INTR] = (MAX_BYTES_PER_FRAME *
282 MAX_PERIODIC_FRAME_USAGE) / 100
283 };
284 struct ed *ed;
285 struct td *td;
286 int ans = 1;
287 u32 save_transaction_time = usb->sw_transaction_time;
288
289 list_for_each_entry(ed, list, node) {
290 td = ed->td_head;
291
292 if (!td || (td && td->status == USB_TD_INPROGRESS))
293 continue;
294
295 if (ed->state != FHCI_ED_OPER) {
296 if (ed->state == FHCI_ED_URB_DEL) {
297 td->status = USB_TD_OK;
298 fhci_move_td_from_ed_to_done_list(usb, ed);
299 ed->state = FHCI_ED_SKIP;
300 }
301 continue;
302 }
303
304 /*
305 * if it isn't interrupt pipe or it is not iso pipe and the
306 * interval time passed
307 */
308 if ((list_type == FHCI_TF_INTR || list_type == FHCI_TF_ISO) &&
309 (((usb->actual_frame->frame_num -
310 td->start_frame) & 0x7ff) < td->interval))
311 continue;
312
313 if (add_packet(usb, ed, td) < 0)
314 continue;
315
316 /* update time stamps in the TD */
317 td->start_frame = usb->actual_frame->frame_num;
318 usb->sw_transaction_time += save_transaction_time;
319
320 if (usb->actual_frame->total_bytes >=
321 usb->max_bytes_per_frame) {
322 usb->actual_frame->frame_status =
323 FRAME_DATA_END_TRANSMISSION;
324 fhci_push_dummy_bd(usb->ep0);
325 ans = 0;
326 break;
327 }
328
329 if (usb->actual_frame->total_bytes >= frame_part[list_type])
330 break;
331 }
332
333 /* be fair to each ED(move list head around) */
334 move_head_to_tail(list);
335 usb->sw_transaction_time = save_transaction_time;
336
337 return ans;
338 }
339
340 static u32 rotate_frames(struct fhci_usb *usb)
341 {
342 struct fhci_hcd *fhci = usb->fhci;
343
344 if (!list_empty(&usb->actual_frame->tds_list)) {
345 if ((((in_be16(&fhci->pram->frame_num) & 0x07ff) -
346 usb->actual_frame->frame_num) & 0x7ff) > 5)
347 fhci_flush_actual_frame(usb);
348 else
349 return -EINVAL;
350 }
351
352 usb->actual_frame->frame_status = FRAME_IS_PREPARED;
353 usb->actual_frame->frame_num = in_be16(&fhci->pram->frame_num) & 0x7ff;
354 usb->actual_frame->total_bytes = 0;
355
356 return 0;
357 }
358
359 /*
360 * This function schedule the USB transaction and will process the
361 * endpoint in the following order: iso, interrupt, control and bulk.
362 */
363 void fhci_schedule_transactions(struct fhci_usb *usb)
364 {
365 int left = 1;
366
367 if (usb->actual_frame->frame_status & FRAME_END_TRANSMISSION)
368 if (rotate_frames(usb) != 0)
369 return;
370
371 if (usb->actual_frame->frame_status & FRAME_END_TRANSMISSION)
372 return;
373
374 if (usb->actual_frame->total_bytes == 0) {
375 /*
376 * schedule the next available ISO transfer
377 *or next stage of the ISO transfer
378 */
379 scan_ed_list(usb, &usb->hc_list->iso_list, FHCI_TF_ISO);
380
381 /*
382 * schedule the next available interrupt transfer or
383 * the next stage of the interrupt transfer
384 */
385 scan_ed_list(usb, &usb->hc_list->intr_list, FHCI_TF_INTR);
386
387 /*
388 * schedule the next available control transfer
389 * or the next stage of the control transfer
390 */
391 left = scan_ed_list(usb, &usb->hc_list->ctrl_list,
392 FHCI_TF_CTRL);
393 }
394
395 /*
396 * schedule the next available bulk transfer or the next stage of the
397 * bulk transfer
398 */
399 if (left > 0)
400 scan_ed_list(usb, &usb->hc_list->bulk_list, FHCI_TF_BULK);
401 }
402
403 /* Handles SOF interrupt */
404 static void sof_interrupt(struct fhci_hcd *fhci)
405 {
406 struct fhci_usb *usb = fhci->usb_lld;
407
408 if ((usb->port_status == FHCI_PORT_DISABLED) &&
409 (usb->vroot_hub->port.wPortStatus & USB_PORT_STAT_CONNECTION) &&
410 !(usb->vroot_hub->port.wPortChange & USB_PORT_STAT_C_CONNECTION)) {
411 if (usb->vroot_hub->port.wPortStatus & USB_PORT_STAT_LOW_SPEED)
412 usb->port_status = FHCI_PORT_LOW;
413 else
414 usb->port_status = FHCI_PORT_FULL;
415 /* Disable IDLE */
416 usb->saved_msk &= ~USB_E_IDLE_MASK;
417 out_be16(&usb->fhci->regs->usb_mask, usb->saved_msk);
418 }
419
420 gtm_set_exact_timer16(fhci->timer, usb->max_frame_usage, false);
421
422 fhci_host_transmit_actual_frame(usb);
423 usb->actual_frame->frame_status = FRAME_IS_TRANSMITTED;
424
425 fhci_schedule_transactions(usb);
426 }
427
428 /* Handles device disconnected interrupt on port */
429 void fhci_device_disconnected_interrupt(struct fhci_hcd *fhci)
430 {
431 struct fhci_usb *usb = fhci->usb_lld;
432
433 fhci_dbg(fhci, "-> %s\n", __func__);
434
435 fhci_usb_disable_interrupt(usb);
436 clrbits8(&usb->fhci->regs->usb_mod, USB_MODE_LSS);
437 usb->port_status = FHCI_PORT_DISABLED;
438
439 fhci_stop_sof_timer(fhci);
440
441 /* Enable IDLE since we want to know if something comes along */
442 usb->saved_msk |= USB_E_IDLE_MASK;
443 out_be16(&usb->fhci->regs->usb_mask, usb->saved_msk);
444
445 usb->vroot_hub->port.wPortStatus &= ~USB_PORT_STAT_CONNECTION;
446 usb->vroot_hub->port.wPortChange |= USB_PORT_STAT_C_CONNECTION;
447 usb->max_bytes_per_frame = 0;
448 fhci_usb_enable_interrupt(usb);
449
450 fhci_dbg(fhci, "<- %s\n", __func__);
451 }
452
453 /* detect a new device connected on the USB port */
454 void fhci_device_connected_interrupt(struct fhci_hcd *fhci)
455 {
456
457 struct fhci_usb *usb = fhci->usb_lld;
458 int state;
459 int ret;
460
461 fhci_dbg(fhci, "-> %s\n", __func__);
462
463 fhci_usb_disable_interrupt(usb);
464 state = fhci_ioports_check_bus_state(fhci);
465
466 /* low-speed device was connected to the USB port */
467 if (state == 1) {
468 ret = qe_usb_clock_set(fhci->lowspeed_clk, USB_CLOCK >> 3);
469 if (ret) {
470 fhci_warn(fhci, "Low-Speed device is not supported, "
471 "try use BRGx\n");
472 goto out;
473 }
474
475 usb->port_status = FHCI_PORT_LOW;
476 setbits8(&usb->fhci->regs->usb_mod, USB_MODE_LSS);
477 usb->vroot_hub->port.wPortStatus |=
478 (USB_PORT_STAT_LOW_SPEED |
479 USB_PORT_STAT_CONNECTION);
480 usb->vroot_hub->port.wPortChange |=
481 USB_PORT_STAT_C_CONNECTION;
482 usb->max_bytes_per_frame =
483 (MAX_BYTES_PER_FRAME >> 3) - 7;
484 fhci_port_enable(usb);
485 } else if (state == 2) {
486 ret = qe_usb_clock_set(fhci->fullspeed_clk, USB_CLOCK);
487 if (ret) {
488 fhci_warn(fhci, "Full-Speed device is not supported, "
489 "try use CLKx\n");
490 goto out;
491 }
492
493 usb->port_status = FHCI_PORT_FULL;
494 clrbits8(&usb->fhci->regs->usb_mod, USB_MODE_LSS);
495 usb->vroot_hub->port.wPortStatus &=
496 ~USB_PORT_STAT_LOW_SPEED;
497 usb->vroot_hub->port.wPortStatus |=
498 USB_PORT_STAT_CONNECTION;
499 usb->vroot_hub->port.wPortChange |=
500 USB_PORT_STAT_C_CONNECTION;
501 usb->max_bytes_per_frame = (MAX_BYTES_PER_FRAME - 15);
502 fhci_port_enable(usb);
503 }
504 out:
505 fhci_usb_enable_interrupt(usb);
506 fhci_dbg(fhci, "<- %s\n", __func__);
507 }
508
509 irqreturn_t fhci_frame_limit_timer_irq(int irq, void *_hcd)
510 {
511 struct usb_hcd *hcd = _hcd;
512 struct fhci_hcd *fhci = hcd_to_fhci(hcd);
513 struct fhci_usb *usb = fhci->usb_lld;
514
515 spin_lock(&fhci->lock);
516
517 gtm_set_exact_timer16(fhci->timer, 1000, false);
518
519 if (usb->actual_frame->frame_status == FRAME_IS_TRANSMITTED) {
520 usb->actual_frame->frame_status = FRAME_TIMER_END_TRANSMISSION;
521 fhci_push_dummy_bd(usb->ep0);
522 }
523
524 fhci_schedule_transactions(usb);
525
526 spin_unlock(&fhci->lock);
527
528 return IRQ_HANDLED;
529 }
530
531 /* Cancel transmission on the USB endpoint */
532 static void abort_transmission(struct fhci_usb *usb)
533 {
534 fhci_dbg(usb->fhci, "-> %s\n", __func__);
535 /* issue stop Tx command */
536 qe_issue_cmd(QE_USB_STOP_TX, QE_CR_SUBBLOCK_USB, EP_ZERO, 0);
537 /* flush Tx FIFOs */
538 out_8(&usb->fhci->regs->usb_comm, USB_CMD_FLUSH_FIFO | EP_ZERO);
539 udelay(1000);
540 /* reset Tx BDs */
541 fhci_flush_bds(usb);
542 /* issue restart Tx command */
543 qe_issue_cmd(QE_USB_RESTART_TX, QE_CR_SUBBLOCK_USB, EP_ZERO, 0);
544 fhci_dbg(usb->fhci, "<- %s\n", __func__);
545 }
546
547 irqreturn_t fhci_irq(struct usb_hcd *hcd)
548 {
549 struct fhci_hcd *fhci = hcd_to_fhci(hcd);
550 struct fhci_usb *usb;
551 u16 usb_er = 0;
552 unsigned long flags;
553
554 spin_lock_irqsave(&fhci->lock, flags);
555
556 usb = fhci->usb_lld;
557
558 usb_er |= in_be16(&usb->fhci->regs->usb_event) &
559 in_be16(&usb->fhci->regs->usb_mask);
560
561 /* clear event bits for next time */
562 out_be16(&usb->fhci->regs->usb_event, usb_er);
563
564 fhci_dbg_isr(fhci, usb_er);
565
566 if (usb_er & USB_E_RESET_MASK) {
567 if ((usb->port_status == FHCI_PORT_FULL) ||
568 (usb->port_status == FHCI_PORT_LOW)) {
569 fhci_device_disconnected_interrupt(fhci);
570 usb_er &= ~USB_E_IDLE_MASK;
571 } else if (usb->port_status == FHCI_PORT_WAITING) {
572 usb->port_status = FHCI_PORT_DISCONNECTING;
573
574 /* Turn on IDLE since we want to disconnect */
575 usb->saved_msk |= USB_E_IDLE_MASK;
576 out_be16(&usb->fhci->regs->usb_event,
577 usb->saved_msk);
578 } else if (usb->port_status == FHCI_PORT_DISABLED) {
579 if (fhci_ioports_check_bus_state(fhci) == 1)
580 fhci_device_connected_interrupt(fhci);
581 }
582 usb_er &= ~USB_E_RESET_MASK;
583 }
584
585 if (usb_er & USB_E_MSF_MASK) {
586 abort_transmission(fhci->usb_lld);
587 usb_er &= ~USB_E_MSF_MASK;
588 }
589
590 if (usb_er & (USB_E_SOF_MASK | USB_E_SFT_MASK)) {
591 sof_interrupt(fhci);
592 usb_er &= ~(USB_E_SOF_MASK | USB_E_SFT_MASK);
593 }
594
595 if (usb_er & USB_E_TXB_MASK) {
596 fhci_tx_conf_interrupt(fhci->usb_lld);
597 usb_er &= ~USB_E_TXB_MASK;
598 }
599
600 if (usb_er & USB_E_TXE1_MASK) {
601 fhci_tx_conf_interrupt(fhci->usb_lld);
602 usb_er &= ~USB_E_TXE1_MASK;
603 }
604
605 if (usb_er & USB_E_IDLE_MASK) {
606 if (usb->port_status == FHCI_PORT_DISABLED) {
607 usb_er &= ~USB_E_RESET_MASK;
608 fhci_device_connected_interrupt(fhci);
609 } else if (usb->port_status ==
610 FHCI_PORT_DISCONNECTING) {
611 /* XXX usb->port_status = FHCI_PORT_WAITING; */
612 /* Disable IDLE */
613 usb->saved_msk &= ~USB_E_IDLE_MASK;
614 out_be16(&usb->fhci->regs->usb_mask,
615 usb->saved_msk);
616 } else {
617 fhci_dbg_isr(fhci, -1);
618 }
619
620 usb_er &= ~USB_E_IDLE_MASK;
621 }
622
623 spin_unlock_irqrestore(&fhci->lock, flags);
624
625 return IRQ_HANDLED;
626 }
627
628
629 /*
630 * Process normal completions(error or success) and clean the schedule.
631 *
632 * This is the main path for handing urbs back to drivers. The only other patth
633 * is process_del_list(),which unlinks URBs by scanning EDs,instead of scanning
634 * the (re-reversed) done list as this does.
635 */
636 static void process_done_list(unsigned long data)
637 {
638 struct urb *urb;
639 struct ed *ed;
640 struct td *td;
641 struct urb_priv *urb_priv;
642 struct fhci_hcd *fhci = (struct fhci_hcd *)data;
643
644 disable_irq(fhci->timer->irq);
645 disable_irq(fhci_to_hcd(fhci)->irq);
646 spin_lock(&fhci->lock);
647
648 td = fhci_remove_td_from_done_list(fhci->hc_list);
649 while (td != NULL) {
650 urb = td->urb;
651 urb_priv = urb->hcpriv;
652 ed = td->ed;
653
654 /* update URB's length and status from TD */
655 fhci_done_td(urb, td);
656 urb_priv->tds_cnt++;
657
658 /*
659 * if all this urb's TDs are done, call complete()
660 * Interrupt transfers are the onley special case:
661 * they are reissued,until "deleted" by usb_unlink_urb
662 * (real work done in a SOF intr, by process_del_list)
663 */
664 if (urb_priv->tds_cnt == urb_priv->num_of_tds) {
665 fhci_urb_complete_free(fhci, urb);
666 } else if (urb_priv->state == URB_DEL &&
667 ed->state == FHCI_ED_SKIP) {
668 fhci_del_ed_list(fhci, ed);
669 ed->state = FHCI_ED_OPER;
670 } else if (ed->state == FHCI_ED_HALTED) {
671 urb_priv->state = URB_DEL;
672 ed->state = FHCI_ED_URB_DEL;
673 fhci_del_ed_list(fhci, ed);
674 ed->state = FHCI_ED_OPER;
675 }
676
677 td = fhci_remove_td_from_done_list(fhci->hc_list);
678 }
679
680 spin_unlock(&fhci->lock);
681 enable_irq(fhci->timer->irq);
682 enable_irq(fhci_to_hcd(fhci)->irq);
683 }
684
685 DECLARE_TASKLET(fhci_tasklet, process_done_list, 0);
686
687 /* transfer complted callback */
688 u32 fhci_transfer_confirm_callback(struct fhci_hcd *fhci)
689 {
690 if (!fhci->process_done_task->state)
691 tasklet_schedule(fhci->process_done_task);
692 return 0;
693 }
694
695 /*
696 * adds urb to the endpoint descriptor list
697 * arguments:
698 * fhci data structure for the Low level host controller
699 * ep USB Host endpoint data structure
700 * urb USB request block data structure
701 */
702 void fhci_queue_urb(struct fhci_hcd *fhci, struct urb *urb)
703 {
704 struct ed *ed = urb->ep->hcpriv;
705 struct urb_priv *urb_priv = urb->hcpriv;
706 u32 data_len = urb->transfer_buffer_length;
707 int urb_state = 0;
708 int toggle = 0;
709 struct td *td;
710 u8 *data;
711 u16 cnt = 0;
712
713 if (ed == NULL) {
714 ed = fhci_get_empty_ed(fhci);
715 ed->dev_addr = usb_pipedevice(urb->pipe);
716 ed->ep_addr = usb_pipeendpoint(urb->pipe);
717 switch (usb_pipetype(urb->pipe)) {
718 case PIPE_CONTROL:
719 ed->mode = FHCI_TF_CTRL;
720 break;
721 case PIPE_BULK:
722 ed->mode = FHCI_TF_BULK;
723 break;
724 case PIPE_INTERRUPT:
725 ed->mode = FHCI_TF_INTR;
726 break;
727 case PIPE_ISOCHRONOUS:
728 ed->mode = FHCI_TF_ISO;
729 break;
730 default:
731 break;
732 }
733 ed->speed = (urb->dev->speed == USB_SPEED_LOW) ?
734 FHCI_LOW_SPEED : FHCI_FULL_SPEED;
735 ed->max_pkt_size = usb_maxpacket(urb->dev,
736 urb->pipe, usb_pipeout(urb->pipe));
737 urb->ep->hcpriv = ed;
738 fhci_dbg(fhci, "new ep speed=%d max_pkt_size=%d\n",
739 ed->speed, ed->max_pkt_size);
740 }
741
742 /* for ISO transfer calculate start frame index */
743 if (ed->mode == FHCI_TF_ISO && urb->transfer_flags & URB_ISO_ASAP)
744 urb->start_frame = ed->td_head ? ed->last_iso + 1 :
745 get_frame_num(fhci);
746
747 /*
748 * OHCI handles the DATA toggle itself,we just use the USB
749 * toggle bits
750 */
751 if (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
752 usb_pipeout(urb->pipe)))
753 toggle = USB_TD_TOGGLE_CARRY;
754 else {
755 toggle = USB_TD_TOGGLE_DATA0;
756 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
757 usb_pipeout(urb->pipe), 1);
758 }
759
760 urb_priv->tds_cnt = 0;
761 urb_priv->ed = ed;
762 if (data_len > 0)
763 data = urb->transfer_buffer;
764 else
765 data = NULL;
766
767 switch (ed->mode) {
768 case FHCI_TF_BULK:
769 if (urb->transfer_flags & URB_ZERO_PACKET &&
770 urb->transfer_buffer_length > 0 &&
771 ((urb->transfer_buffer_length %
772 usb_maxpacket(urb->dev, urb->pipe,
773 usb_pipeout(urb->pipe))) == 0))
774 urb_state = US_BULK0;
775 while (data_len > 4096) {
776 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
777 usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
778 FHCI_TA_IN,
779 cnt ? USB_TD_TOGGLE_CARRY :
780 toggle,
781 data, 4096, 0, 0, true);
782 data += 4096;
783 data_len -= 4096;
784 cnt++;
785 }
786
787 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
788 usb_pipeout(urb->pipe) ? FHCI_TA_OUT : FHCI_TA_IN,
789 cnt ? USB_TD_TOGGLE_CARRY : toggle,
790 data, data_len, 0, 0, true);
791 cnt++;
792
793 if (urb->transfer_flags & URB_ZERO_PACKET &&
794 cnt < urb_priv->num_of_tds) {
795 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
796 usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
797 FHCI_TA_IN,
798 USB_TD_TOGGLE_CARRY, NULL, 0, 0, 0, true);
799 cnt++;
800 }
801 break;
802 case FHCI_TF_INTR:
803 urb->start_frame = get_frame_num(fhci) + 1;
804 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
805 usb_pipeout(urb->pipe) ? FHCI_TA_OUT : FHCI_TA_IN,
806 USB_TD_TOGGLE_DATA0, data, data_len,
807 urb->interval, urb->start_frame, true);
808 break;
809 case FHCI_TF_CTRL:
810 ed->dev_addr = usb_pipedevice(urb->pipe);
811 ed->max_pkt_size = usb_maxpacket(urb->dev, urb->pipe,
812 usb_pipeout(urb->pipe));
813 /* setup stage */
814 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++, FHCI_TA_SETUP,
815 USB_TD_TOGGLE_DATA0, urb->setup_packet, 8, 0, 0, true);
816
817 /* data stage */
818 if (data_len > 0) {
819 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
820 usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
821 FHCI_TA_IN,
822 USB_TD_TOGGLE_DATA1, data, data_len, 0, 0,
823 true);
824 }
825
826 /* status stage */
827 if (data_len > 0)
828 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
829 (usb_pipeout(urb->pipe) ? FHCI_TA_IN :
830 FHCI_TA_OUT),
831 USB_TD_TOGGLE_DATA1, data, 0, 0, 0, true);
832 else
833 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
834 FHCI_TA_IN,
835 USB_TD_TOGGLE_DATA1, data, 0, 0, 0, true);
836
837 urb_state = US_CTRL_SETUP;
838 break;
839 case FHCI_TF_ISO:
840 for (cnt = 0; cnt < urb->number_of_packets; cnt++) {
841 u16 frame = urb->start_frame;
842
843 /*
844 * FIXME scheduling should handle frame counter
845 * roll-around ... exotic case (and OHCI has
846 * a 2^16 iso range, vs other HCs max of 2^10)
847 */
848 frame += cnt * urb->interval;
849 frame &= 0x07ff;
850 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
851 usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
852 FHCI_TA_IN,
853 USB_TD_TOGGLE_DATA0,
854 data + urb->iso_frame_desc[cnt].offset,
855 urb->iso_frame_desc[cnt].length,
856 urb->interval, frame, true);
857 }
858 break;
859 default:
860 break;
861 }
862
863 /*
864 * set the state of URB
865 * control pipe:3 states -- setup,data,status
866 * interrupt and bulk pipe:1 state -- data
867 */
868 urb->pipe &= ~0x1f;
869 urb->pipe |= urb_state & 0x1f;
870
871 urb_priv->state = URB_INPROGRESS;
872
873 if (!ed->td_head) {
874 ed->state = FHCI_ED_OPER;
875 switch (ed->mode) {
876 case FHCI_TF_CTRL:
877 list_add(&ed->node, &fhci->hc_list->ctrl_list);
878 break;
879 case FHCI_TF_BULK:
880 list_add(&ed->node, &fhci->hc_list->bulk_list);
881 break;
882 case FHCI_TF_INTR:
883 list_add(&ed->node, &fhci->hc_list->intr_list);
884 break;
885 case FHCI_TF_ISO:
886 list_add(&ed->node, &fhci->hc_list->iso_list);
887 break;
888 default:
889 break;
890 }
891 }
892
893 fhci_add_tds_to_ed(ed, urb_priv->tds, urb_priv->num_of_tds);
894 fhci->active_urbs++;
895 }
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