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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / usb / host / fhci-sched.c
blob2f162faabbca89ead7fbb01fa809e2367b64b7ae
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 <soc/fsl/qe/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->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) {
743 /* Ignore the possibility of underruns */
744 urb->start_frame = ed->td_head ? ed->next_iso :
745 get_frame_num(fhci);
746 ed->next_iso = (urb->start_frame + urb->interval *
747 urb->number_of_packets) & 0x07ff;
748 }
749
750 /*
751 * OHCI handles the DATA toggle itself,we just use the USB
752 * toggle bits
753 */
754 if (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
755 usb_pipeout(urb->pipe)))
756 toggle = USB_TD_TOGGLE_CARRY;
757 else {
758 toggle = USB_TD_TOGGLE_DATA0;
759 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
760 usb_pipeout(urb->pipe), 1);
761 }
762
763 urb_priv->tds_cnt = 0;
764 urb_priv->ed = ed;
765 if (data_len > 0)
766 data = urb->transfer_buffer;
767 else
768 data = NULL;
769
770 switch (ed->mode) {
771 case FHCI_TF_BULK:
772 if (urb->transfer_flags & URB_ZERO_PACKET &&
773 urb->transfer_buffer_length > 0 &&
774 ((urb->transfer_buffer_length %
775 usb_maxpacket(urb->dev, urb->pipe,
776 usb_pipeout(urb->pipe))) == 0))
777 urb_state = US_BULK0;
778 while (data_len > 4096) {
779 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
780 usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
781 FHCI_TA_IN,
782 cnt ? USB_TD_TOGGLE_CARRY :
783 toggle,
784 data, 4096, 0, 0, true);
785 data += 4096;
786 data_len -= 4096;
787 cnt++;
788 }
789
790 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
791 usb_pipeout(urb->pipe) ? FHCI_TA_OUT : FHCI_TA_IN,
792 cnt ? USB_TD_TOGGLE_CARRY : toggle,
793 data, data_len, 0, 0, true);
794 cnt++;
795
796 if (urb->transfer_flags & URB_ZERO_PACKET &&
797 cnt < urb_priv->num_of_tds) {
798 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
799 usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
800 FHCI_TA_IN,
801 USB_TD_TOGGLE_CARRY, NULL, 0, 0, 0, true);
802 cnt++;
803 }
804 break;
805 case FHCI_TF_INTR:
806 urb->start_frame = get_frame_num(fhci) + 1;
807 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
808 usb_pipeout(urb->pipe) ? FHCI_TA_OUT : FHCI_TA_IN,
809 USB_TD_TOGGLE_DATA0, data, data_len,
810 urb->interval, urb->start_frame, true);
811 break;
812 case FHCI_TF_CTRL:
813 ed->dev_addr = usb_pipedevice(urb->pipe);
814 ed->max_pkt_size = usb_maxpacket(urb->dev, urb->pipe,
815 usb_pipeout(urb->pipe));
816 /* setup stage */
817 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++, FHCI_TA_SETUP,
818 USB_TD_TOGGLE_DATA0, urb->setup_packet, 8, 0, 0, true);
819
820 /* data stage */
821 if (data_len > 0) {
822 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
823 usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
824 FHCI_TA_IN,
825 USB_TD_TOGGLE_DATA1, data, data_len, 0, 0,
826 true);
827 }
828
829 /* status stage */
830 if (data_len > 0)
831 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
832 (usb_pipeout(urb->pipe) ? FHCI_TA_IN :
833 FHCI_TA_OUT),
834 USB_TD_TOGGLE_DATA1, data, 0, 0, 0, true);
835 else
836 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt++,
837 FHCI_TA_IN,
838 USB_TD_TOGGLE_DATA1, data, 0, 0, 0, true);
839
840 urb_state = US_CTRL_SETUP;
841 break;
842 case FHCI_TF_ISO:
843 for (cnt = 0; cnt < urb->number_of_packets; cnt++) {
844 u16 frame = urb->start_frame;
845
846 /*
847 * FIXME scheduling should handle frame counter
848 * roll-around ... exotic case (and OHCI has
849 * a 2^16 iso range, vs other HCs max of 2^10)
850 */
851 frame += cnt * urb->interval;
852 frame &= 0x07ff;
853 td = fhci_td_fill(fhci, urb, urb_priv, ed, cnt,
854 usb_pipeout(urb->pipe) ? FHCI_TA_OUT :
855 FHCI_TA_IN,
856 USB_TD_TOGGLE_DATA0,
857 data + urb->iso_frame_desc[cnt].offset,
858 urb->iso_frame_desc[cnt].length,
859 urb->interval, frame, true);
860 }
861 break;
862 default:
863 break;
864 }
865
866 /*
867 * set the state of URB
868 * control pipe:3 states -- setup,data,status
869 * interrupt and bulk pipe:1 state -- data
870 */
871 urb->pipe &= ~0x1f;
872 urb->pipe |= urb_state & 0x1f;
873
874 urb_priv->state = URB_INPROGRESS;
875
876 if (!ed->td_head) {
877 ed->state = FHCI_ED_OPER;
878 switch (ed->mode) {
879 case FHCI_TF_CTRL:
880 list_add(&ed->node, &fhci->hc_list->ctrl_list);
881 break;
882 case FHCI_TF_BULK:
883 list_add(&ed->node, &fhci->hc_list->bulk_list);
884 break;
885 case FHCI_TF_INTR:
886 list_add(&ed->node, &fhci->hc_list->intr_list);
887 break;
888 case FHCI_TF_ISO:
889 list_add(&ed->node, &fhci->hc_list->iso_list);
890 break;
891 default:
892 break;
893 }
894 }
895
896 fhci_add_tds_to_ed(ed, urb_priv->tds, urb_priv->num_of_tds);
897 fhci->active_urbs++;
898 }
Linux with added FPC-III support