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Fix spelling of "occurred".
[people/ms/u-boot.git] / drivers / usb / gadget / mpc8xx_udc.c
1 /*
2 * Copyright (C) 2006 by Bryan O'Donoghue, CodeHermit
3 * bodonoghue@CodeHermit.ie
4 *
5 * References
6 * DasUBoot/drivers/usb/gadget/omap1510_udc.c, for design and implementation
7 * ideas.
8 *
9 * SPDX-License-Identifier: GPL-2.0+
10 */
11
12 /*
13 * Notes :
14 * 1. #define __SIMULATE_ERROR__ to inject a CRC error into every 2nd TX
15 * packet to force the USB re-transmit protocol.
16 *
17 * 2. #define __DEBUG_UDC__ to switch on debug tracing to serial console
18 * be careful that tracing doesn't create Hiesen-bugs with respect to
19 * response timeouts to control requests.
20 *
21 * 3. This driver should be able to support any higher level driver that
22 * that wants to do either of the two standard UDC implementations
23 * Control-Bulk-Interrupt or Bulk-IN/Bulk-Out standards. Hence
24 * gserial and cdc_acm should work with this code.
25 *
26 * 4. NAK events never actually get raised at all, the documentation
27 * is just wrong !
28 *
29 * 5. For some reason, cbd_datlen is *always* +2 the value it should be.
30 * this means that having an RX cbd of 16 bytes is not possible, since
31 * the same size is reported for 14 bytes received as 16 bytes received
32 * until we can find out why this happens, RX cbds must be limited to 8
33 * bytes. TODO: check errata for this behaviour.
34 *
35 * 6. Right now this code doesn't support properly powering up with the USB
36 * cable attached to the USB host my development board the Adder87x doesn't
37 * have a pull-up fitted to allow this, so it is necessary to power the
38 * board and *then* attached the USB cable to the host. However somebody
39 * with a different design in their board may be able to keep the cable
40 * constantly connected and simply enable/disable a pull-up re
41 * figure 31.1 in MPC885RM.pdf instead of having to power up the board and
42 * then attach the cable !
43 *
44 */
45 #include <common.h>
46 #include <config.h>
47 #include <commproc.h>
48 #include <usbdevice.h>
49 #include <usb/mpc8xx_udc.h>
50 #include <usb/udc.h>
51
52 #include "ep0.h"
53
54 DECLARE_GLOBAL_DATA_PTR;
55
56 #define ERR(fmt, args...)\
57 serial_printf("ERROR : [%s] %s:%d: "fmt,\
58 __FILE__,__FUNCTION__,__LINE__, ##args)
59 #ifdef __DEBUG_UDC__
60 #define DBG(fmt,args...)\
61 serial_printf("[%s] %s:%d: "fmt,\
62 __FILE__,__FUNCTION__,__LINE__, ##args)
63 #else
64 #define DBG(fmt,args...)
65 #endif
66
67 /* Static Data */
68 #ifdef __SIMULATE_ERROR__
69 static char err_poison_test = 0;
70 #endif
71 static struct mpc8xx_ep ep_ref[MAX_ENDPOINTS];
72 static u32 address_base = STATE_NOT_READY;
73 static mpc8xx_udc_state_t udc_state = 0;
74 static struct usb_device_instance *udc_device = 0;
75 static volatile usb_epb_t *endpoints[MAX_ENDPOINTS];
76 static volatile cbd_t *tx_cbd[TX_RING_SIZE];
77 static volatile cbd_t *rx_cbd[RX_RING_SIZE];
78 static volatile immap_t *immr = 0;
79 static volatile cpm8xx_t *cp = 0;
80 static volatile usb_pram_t *usb_paramp = 0;
81 static volatile usb_t *usbp = 0;
82 static int rx_ct = 0;
83 static int tx_ct = 0;
84
85 /* Static Function Declarations */
86 static void mpc8xx_udc_state_transition_up (usb_device_state_t initial,
87 usb_device_state_t final);
88 static void mpc8xx_udc_state_transition_down (usb_device_state_t initial,
89 usb_device_state_t final);
90 static void mpc8xx_udc_stall (unsigned int ep);
91 static void mpc8xx_udc_flush_tx_fifo (int epid);
92 static void mpc8xx_udc_flush_rx_fifo (void);
93 static void mpc8xx_udc_clear_rxbd (volatile cbd_t * rx_cbdp);
94 static void mpc8xx_udc_init_tx (struct usb_endpoint_instance *epi,
95 struct urb *tx_urb);
96 static void mpc8xx_udc_dump_request (struct usb_device_request *request);
97 static void mpc8xx_udc_clock_init (volatile immap_t * immr,
98 volatile cpm8xx_t * cp);
99 static int mpc8xx_udc_ep_tx (struct usb_endpoint_instance *epi);
100 static int mpc8xx_udc_epn_rx (unsigned int epid, volatile cbd_t * rx_cbdp);
101 static void mpc8xx_udc_ep0_rx (volatile cbd_t * rx_cbdp);
102 static void mpc8xx_udc_cbd_init (void);
103 static void mpc8xx_udc_endpoint_init (void);
104 static void mpc8xx_udc_cbd_attach (int ep, uchar tx_size, uchar rx_size);
105 static u32 mpc8xx_udc_alloc (u32 data_size, u32 alignment);
106 static int mpc8xx_udc_ep0_rx_setup (volatile cbd_t * rx_cbdp);
107 static void mpc8xx_udc_set_nak (unsigned int ep);
108 static short mpc8xx_udc_handle_txerr (void);
109 static void mpc8xx_udc_advance_rx (volatile cbd_t ** rx_cbdp, int epid);
110
111 /******************************************************************************
112 Global Linkage
113 *****************************************************************************/
114
115 /* udc_init
116 *
117 * Do initial bus gluing
118 */
119 int udc_init (void)
120 {
121 /* Init various pointers */
122 immr = (immap_t *) CONFIG_SYS_IMMR;
123 cp = (cpm8xx_t *) & (immr->im_cpm);
124 usb_paramp = (usb_pram_t *) & (cp->cp_dparam[PROFF_USB]);
125 usbp = (usb_t *) & (cp->cp_scc[0]);
126
127 memset (ep_ref, 0x00, (sizeof (struct mpc8xx_ep) * MAX_ENDPOINTS));
128
129 udc_device = 0;
130 udc_state = STATE_NOT_READY;
131
132 usbp->usmod = 0x00;
133 usbp->uscom = 0;
134
135 /* Set USB Frame #0, Respond at Address & Get a clock source */
136 usbp->usaddr = 0x00;
137 mpc8xx_udc_clock_init (immr, cp);
138
139 /* PA15, PA14 as perhiperal USBRXD and USBOE */
140 immr->im_ioport.iop_padir &= ~0x0003;
141 immr->im_ioport.iop_papar |= 0x0003;
142
143 /* PC11/PC10 as peripheral USBRXP USBRXN */
144 immr->im_ioport.iop_pcso |= 0x0030;
145
146 /* PC7/PC6 as perhiperal USBTXP and USBTXN */
147 immr->im_ioport.iop_pcdir |= 0x0300;
148 immr->im_ioport.iop_pcpar |= 0x0300;
149
150 /* Set the base address */
151 address_base = (u32) (cp->cp_dpmem + CPM_USB_BASE);
152
153 /* Initialise endpoints and circular buffers */
154 mpc8xx_udc_endpoint_init ();
155 mpc8xx_udc_cbd_init ();
156
157 /* Assign allocated Dual Port Endpoint descriptors */
158 usb_paramp->ep0ptr = (u32) endpoints[0];
159 usb_paramp->ep1ptr = (u32) endpoints[1];
160 usb_paramp->ep2ptr = (u32) endpoints[2];
161 usb_paramp->ep3ptr = (u32) endpoints[3];
162 usb_paramp->frame_n = 0;
163
164 DBG ("ep0ptr=0x%08x ep1ptr=0x%08x ep2ptr=0x%08x ep3ptr=0x%08x\n",
165 usb_paramp->ep0ptr, usb_paramp->ep1ptr, usb_paramp->ep2ptr,
166 usb_paramp->ep3ptr);
167
168 return 0;
169 }
170
171 /* udc_irq
172 *
173 * Poll for whatever events may have occurred
174 */
175 void udc_irq (void)
176 {
177 int epid = 0;
178 volatile cbd_t *rx_cbdp = 0;
179 volatile cbd_t *rx_cbdp_base = 0;
180
181 if (udc_state != STATE_READY) {
182 return;
183 }
184
185 if (usbp->usber & USB_E_BSY) {
186 /* This shouldn't happen. If it does then it's a bug ! */
187 usbp->usber |= USB_E_BSY;
188 mpc8xx_udc_flush_rx_fifo ();
189 }
190
191 /* Scan all RX/Bidirectional Endpoints for RX data. */
192 for (epid = 0; epid < MAX_ENDPOINTS; epid++) {
193 if (!ep_ref[epid].prx) {
194 continue;
195 }
196 rx_cbdp = rx_cbdp_base = ep_ref[epid].prx;
197
198 do {
199 if (!(rx_cbdp->cbd_sc & RX_BD_E)) {
200
201 if (rx_cbdp->cbd_sc & 0x1F) {
202 /* Corrupt data discard it.
203 * Controller has NAK'd this packet.
204 */
205 mpc8xx_udc_clear_rxbd (rx_cbdp);
206
207 } else {
208 if (!epid) {
209 mpc8xx_udc_ep0_rx (rx_cbdp);
210
211 } else {
212 /* Process data */
213 mpc8xx_udc_set_nak (epid);
214 mpc8xx_udc_epn_rx (epid, rx_cbdp);
215 mpc8xx_udc_clear_rxbd (rx_cbdp);
216 }
217 }
218
219 /* Advance RX CBD pointer */
220 mpc8xx_udc_advance_rx (&rx_cbdp, epid);
221 ep_ref[epid].prx = rx_cbdp;
222 } else {
223 /* Advance RX CBD pointer */
224 mpc8xx_udc_advance_rx (&rx_cbdp, epid);
225 }
226
227 } while (rx_cbdp != rx_cbdp_base);
228 }
229
230 /* Handle TX events as appropiate, the correct place to do this is
231 * in a tx routine. Perhaps TX on epn was pre-empted by ep0
232 */
233
234 if (usbp->usber & USB_E_TXB) {
235 usbp->usber |= USB_E_TXB;
236 }
237
238 if (usbp->usber & (USB_TX_ERRMASK)) {
239 mpc8xx_udc_handle_txerr ();
240 }
241
242 /* Switch to the default state, respond at the default address */
243 if (usbp->usber & USB_E_RESET) {
244 usbp->usber |= USB_E_RESET;
245 usbp->usaddr = 0x00;
246 udc_device->device_state = STATE_DEFAULT;
247 }
248
249 /* if(usbp->usber&USB_E_IDLE){
250 We could suspend here !
251 usbp->usber|=USB_E_IDLE;
252 DBG("idle state change\n");
253 }
254 if(usbp->usbs){
255 We could resume here when IDLE is deasserted !
256 Not worth doing, so long as we are self powered though.
257 }
258 */
259
260 return;
261 }
262
263 /* udc_endpoint_write
264 *
265 * Write some data to an endpoint
266 */
267 int udc_endpoint_write (struct usb_endpoint_instance *epi)
268 {
269 int ep = 0;
270 short epid = 1, unnak = 0, ret = 0;
271
272 if (udc_state != STATE_READY) {
273 ERR ("invalid udc_state != STATE_READY!\n");
274 return -1;
275 }
276
277 if (!udc_device || !epi) {
278 return -1;
279 }
280
281 if (udc_device->device_state != STATE_CONFIGURED) {
282 return -1;
283 }
284
285 ep = epi->endpoint_address & 0x03;
286 if (ep >= MAX_ENDPOINTS) {
287 return -1;
288 }
289
290 /* Set NAK for all RX endpoints during TX */
291 for (epid = 1; epid < MAX_ENDPOINTS; epid++) {
292
293 /* Don't set NAK on DATA IN/CONTROL endpoints */
294 if (ep_ref[epid].sc & USB_DIR_IN) {
295 continue;
296 }
297
298 if (!(usbp->usep[epid] & (USEP_THS_NAK | USEP_RHS_NAK))) {
299 unnak |= 1 << epid;
300 }
301
302 mpc8xx_udc_set_nak (epid);
303 }
304
305 mpc8xx_udc_init_tx (&udc_device->bus->endpoint_array[ep],
306 epi->tx_urb);
307 ret = mpc8xx_udc_ep_tx (&udc_device->bus->endpoint_array[ep]);
308
309 /* Remove temporary NAK */
310 for (epid = 1; epid < MAX_ENDPOINTS; epid++) {
311 if (unnak & (1 << epid)) {
312 udc_unset_nak (epid);
313 }
314 }
315
316 return ret;
317 }
318
319 /* mpc8xx_udc_assign_urb
320 *
321 * Associate a given urb to an endpoint TX or RX transmit/receive buffers
322 */
323 static int mpc8xx_udc_assign_urb (int ep, char direction)
324 {
325 struct usb_endpoint_instance *epi = 0;
326
327 if (ep >= MAX_ENDPOINTS) {
328 goto err;
329 }
330 epi = &udc_device->bus->endpoint_array[ep];
331 if (!epi) {
332 goto err;
333 }
334
335 if (!ep_ref[ep].urb) {
336 ep_ref[ep].urb = usbd_alloc_urb (udc_device, udc_device->bus->endpoint_array);
337 if (!ep_ref[ep].urb) {
338 goto err;
339 }
340 } else {
341 ep_ref[ep].urb->actual_length = 0;
342 }
343
344 switch (direction) {
345 case USB_DIR_IN:
346 epi->tx_urb = ep_ref[ep].urb;
347 break;
348 case USB_DIR_OUT:
349 epi->rcv_urb = ep_ref[ep].urb;
350 break;
351 default:
352 goto err;
353 }
354 return 0;
355
356 err:
357 udc_state = STATE_ERROR;
358 return -1;
359 }
360
361 /* udc_setup_ep
362 *
363 * Associate U-Boot software endpoints to mpc8xx endpoint parameter ram
364 * Isochronous endpoints aren't yet supported!
365 */
366 void udc_setup_ep (struct usb_device_instance *device, unsigned int ep,
367 struct usb_endpoint_instance *epi)
368 {
369 uchar direction = 0;
370 int ep_attrib = 0;
371
372 if (epi && (ep < MAX_ENDPOINTS)) {
373
374 if (ep == 0) {
375 if (epi->rcv_attributes != USB_ENDPOINT_XFER_CONTROL
376 || epi->tx_attributes !=
377 USB_ENDPOINT_XFER_CONTROL) {
378
379 /* ep0 must be a control endpoint */
380 udc_state = STATE_ERROR;
381 return;
382
383 }
384 if (!(ep_ref[ep].sc & EP_ATTACHED)) {
385 mpc8xx_udc_cbd_attach (ep, epi->tx_packetSize,
386 epi->rcv_packetSize);
387 }
388 usbp->usep[ep] = 0x0000;
389 return;
390 }
391
392 if ((epi->endpoint_address & USB_ENDPOINT_DIR_MASK)
393 == USB_DIR_IN) {
394
395 direction = 1;
396 ep_attrib = epi->tx_attributes;
397 epi->rcv_packetSize = 0;
398 ep_ref[ep].sc |= USB_DIR_IN;
399 } else {
400
401 direction = 0;
402 ep_attrib = epi->rcv_attributes;
403 epi->tx_packetSize = 0;
404 ep_ref[ep].sc &= ~USB_DIR_IN;
405 }
406
407 if (mpc8xx_udc_assign_urb (ep, epi->endpoint_address
408 & USB_ENDPOINT_DIR_MASK)) {
409 return;
410 }
411
412 switch (ep_attrib) {
413 case USB_ENDPOINT_XFER_CONTROL:
414 if (!(ep_ref[ep].sc & EP_ATTACHED)) {
415 mpc8xx_udc_cbd_attach (ep,
416 epi->tx_packetSize,
417 epi->rcv_packetSize);
418 }
419 usbp->usep[ep] = ep << 12;
420 epi->rcv_urb = epi->tx_urb = ep_ref[ep].urb;
421
422 break;
423 case USB_ENDPOINT_XFER_BULK:
424 case USB_ENDPOINT_XFER_INT:
425 if (!(ep_ref[ep].sc & EP_ATTACHED)) {
426 if (direction) {
427 mpc8xx_udc_cbd_attach (ep,
428 epi->tx_packetSize,
429 0);
430 } else {
431 mpc8xx_udc_cbd_attach (ep,
432 0,
433 epi->rcv_packetSize);
434 }
435 }
436 usbp->usep[ep] = (ep << 12) | ((ep_attrib) << 8);
437
438 break;
439 case USB_ENDPOINT_XFER_ISOC:
440 default:
441 serial_printf ("Error endpoint attrib %d>3\n", ep_attrib);
442 udc_state = STATE_ERROR;
443 break;
444 }
445 }
446
447 }
448
449 /* udc_connect
450 *
451 * Move state, switch on the USB
452 */
453 void udc_connect (void)
454 {
455 /* Enable pull-up resistor on D+
456 * TODO: fit a pull-up resistor to drive SE0 for > 2.5us
457 */
458
459 if (udc_state != STATE_ERROR) {
460 udc_state = STATE_READY;
461 usbp->usmod |= USMOD_EN;
462 }
463 }
464
465 /* udc_disconnect
466 *
467 * Disconnect is not used but, is included for completeness
468 */
469 void udc_disconnect (void)
470 {
471 /* Disable pull-up resistor on D-
472 * TODO: fix a pullup resistor to control this
473 */
474
475 if (udc_state != STATE_ERROR) {
476 udc_state = STATE_NOT_READY;
477 }
478 usbp->usmod &= ~USMOD_EN;
479 }
480
481 /* udc_enable
482 *
483 * Grab an EP0 URB, register interest in a subset of USB events
484 */
485 void udc_enable (struct usb_device_instance *device)
486 {
487 if (udc_state == STATE_ERROR) {
488 return;
489 }
490
491 udc_device = device;
492
493 if (!ep_ref[0].urb) {
494 ep_ref[0].urb = usbd_alloc_urb (device, device->bus->endpoint_array);
495 }
496
497 /* Register interest in all events except SOF, enable transceiver */
498 usbp->usber = 0x03FF;
499 usbp->usbmr = 0x02F7;
500
501 return;
502 }
503
504 /* udc_disable
505 *
506 * disable the currently hooked device
507 */
508 void udc_disable (void)
509 {
510 int i = 0;
511
512 if (udc_state == STATE_ERROR) {
513 DBG ("Won't disable UDC. udc_state==STATE_ERROR !\n");
514 return;
515 }
516
517 udc_device = 0;
518
519 for (; i < MAX_ENDPOINTS; i++) {
520 if (ep_ref[i].urb) {
521 usbd_dealloc_urb (ep_ref[i].urb);
522 ep_ref[i].urb = 0;
523 }
524 }
525
526 usbp->usbmr = 0x00;
527 usbp->usmod = ~USMOD_EN;
528 udc_state = STATE_NOT_READY;
529 }
530
531 /* udc_startup_events
532 *
533 * Enable the specified device
534 */
535 void udc_startup_events (struct usb_device_instance *device)
536 {
537 udc_enable (device);
538 if (udc_state == STATE_READY) {
539 usbd_device_event_irq (device, DEVICE_CREATE, 0);
540 }
541 }
542
543 /* udc_set_nak
544 *
545 * Allow upper layers to signal lower layers should not accept more RX data
546 *
547 */
548 void udc_set_nak (int epid)
549 {
550 if (epid) {
551 mpc8xx_udc_set_nak (epid);
552 }
553 }
554
555 /* udc_unset_nak
556 *
557 * Suspend sending of NAK tokens for DATA OUT tokens on a given endpoint.
558 * Switch off NAKing on this endpoint to accept more data output from host.
559 *
560 */
561 void udc_unset_nak (int epid)
562 {
563 if (epid > MAX_ENDPOINTS) {
564 return;
565 }
566
567 if (usbp->usep[epid] & (USEP_THS_NAK | USEP_RHS_NAK)) {
568 usbp->usep[epid] &= ~(USEP_THS_NAK | USEP_RHS_NAK);
569 __asm__ ("eieio");
570 }
571 }
572
573 /******************************************************************************
574 Static Linkage
575 ******************************************************************************/
576
577 /* udc_state_transition_up
578 * udc_state_transition_down
579 *
580 * Helper functions to implement device state changes. The device states and
581 * the events that transition between them are:
582 *
583 * STATE_ATTACHED
584 * || /\
585 * \/ ||
586 * DEVICE_HUB_CONFIGURED DEVICE_HUB_RESET
587 * || /\
588 * \/ ||
589 * STATE_POWERED
590 * || /\
591 * \/ ||
592 * DEVICE_RESET DEVICE_POWER_INTERRUPTION
593 * || /\
594 * \/ ||
595 * STATE_DEFAULT
596 * || /\
597 * \/ ||
598 * DEVICE_ADDRESS_ASSIGNED DEVICE_RESET
599 * || /\
600 * \/ ||
601 * STATE_ADDRESSED
602 * || /\
603 * \/ ||
604 * DEVICE_CONFIGURED DEVICE_DE_CONFIGURED
605 * || /\
606 * \/ ||
607 * STATE_CONFIGURED
608 *
609 * udc_state_transition_up transitions up (in the direction from STATE_ATTACHED
610 * to STATE_CONFIGURED) from the specified initial state to the specified final
611 * state, passing through each intermediate state on the way. If the initial
612 * state is at or above (i.e. nearer to STATE_CONFIGURED) the final state, then
613 * no state transitions will take place.
614 *
615 * udc_state_transition_down transitions down (in the direction from
616 * STATE_CONFIGURED to STATE_ATTACHED) from the specified initial state to the
617 * specified final state, passing through each intermediate state on the way.
618 * If the initial state is at or below (i.e. nearer to STATE_ATTACHED) the final
619 * state, then no state transitions will take place.
620 *
621 */
622
623 static void mpc8xx_udc_state_transition_up (usb_device_state_t initial,
624 usb_device_state_t final)
625 {
626 if (initial < final) {
627 switch (initial) {
628 case STATE_ATTACHED:
629 usbd_device_event_irq (udc_device,
630 DEVICE_HUB_CONFIGURED, 0);
631 if (final == STATE_POWERED)
632 break;
633 case STATE_POWERED:
634 usbd_device_event_irq (udc_device, DEVICE_RESET, 0);
635 if (final == STATE_DEFAULT)
636 break;
637 case STATE_DEFAULT:
638 usbd_device_event_irq (udc_device,
639 DEVICE_ADDRESS_ASSIGNED, 0);
640 if (final == STATE_ADDRESSED)
641 break;
642 case STATE_ADDRESSED:
643 usbd_device_event_irq (udc_device, DEVICE_CONFIGURED,
644 0);
645 case STATE_CONFIGURED:
646 break;
647 default:
648 break;
649 }
650 }
651 }
652
653 static void mpc8xx_udc_state_transition_down (usb_device_state_t initial,
654 usb_device_state_t final)
655 {
656 if (initial > final) {
657 switch (initial) {
658 case STATE_CONFIGURED:
659 usbd_device_event_irq (udc_device,
660 DEVICE_DE_CONFIGURED, 0);
661 if (final == STATE_ADDRESSED)
662 break;
663 case STATE_ADDRESSED:
664 usbd_device_event_irq (udc_device, DEVICE_RESET, 0);
665 if (final == STATE_DEFAULT)
666 break;
667 case STATE_DEFAULT:
668 usbd_device_event_irq (udc_device,
669 DEVICE_POWER_INTERRUPTION, 0);
670 if (final == STATE_POWERED)
671 break;
672 case STATE_POWERED:
673 usbd_device_event_irq (udc_device, DEVICE_HUB_RESET,
674 0);
675 case STATE_ATTACHED:
676 break;
677 default:
678 break;
679 }
680 }
681 }
682
683 /* mpc8xx_udc_stall
684 *
685 * Force returning of STALL tokens on the given endpoint. Protocol or function
686 * STALL conditions are permissable here
687 */
688 static void mpc8xx_udc_stall (unsigned int ep)
689 {
690 usbp->usep[ep] |= STALL_BITMASK;
691 }
692
693 /* mpc8xx_udc_set_nak
694 *
695 * Force returning of NAK responses for the given endpoint as a kind of very
696 * simple flow control
697 */
698 static void mpc8xx_udc_set_nak (unsigned int ep)
699 {
700 usbp->usep[ep] |= NAK_BITMASK;
701 __asm__ ("eieio");
702 }
703
704 /* mpc8xx_udc_handle_txerr
705 *
706 * Handle errors relevant to TX. Return a status code to allow calling
707 * indicative of what if anything happened
708 */
709 static short mpc8xx_udc_handle_txerr ()
710 {
711 short ep = 0, ret = 0;
712
713 for (; ep < TX_RING_SIZE; ep++) {
714 if (usbp->usber & (0x10 << ep)) {
715
716 /* Timeout or underrun */
717 if (tx_cbd[ep]->cbd_sc & 0x06) {
718 ret = 1;
719 mpc8xx_udc_flush_tx_fifo (ep);
720
721 } else {
722 if (usbp->usep[ep] & STALL_BITMASK) {
723 if (!ep) {
724 usbp->usep[ep] &= ~STALL_BITMASK;
725 }
726 } /* else NAK */
727 }
728 usbp->usber |= (0x10 << ep);
729 }
730 }
731 return ret;
732 }
733
734 /* mpc8xx_udc_advance_rx
735 *
736 * Advance cbd rx
737 */
738 static void mpc8xx_udc_advance_rx (volatile cbd_t ** rx_cbdp, int epid)
739 {
740 if ((*rx_cbdp)->cbd_sc & RX_BD_W) {
741 *rx_cbdp = (volatile cbd_t *) (endpoints[epid]->rbase + CONFIG_SYS_IMMR);
742
743 } else {
744 (*rx_cbdp)++;
745 }
746 }
747
748
749 /* mpc8xx_udc_flush_tx_fifo
750 *
751 * Flush a given TX fifo. Assumes one tx cbd per endpoint
752 */
753 static void mpc8xx_udc_flush_tx_fifo (int epid)
754 {
755 volatile cbd_t *tx_cbdp = 0;
756
757 if (epid > MAX_ENDPOINTS) {
758 return;
759 }
760
761 /* TX stop */
762 immr->im_cpm.cp_cpcr = ((epid << 2) | 0x1D01);
763 __asm__ ("eieio");
764 while (immr->im_cpm.cp_cpcr & 0x01);
765
766 usbp->uscom = 0x40 | 0;
767
768 /* reset ring */
769 tx_cbdp = (cbd_t *) (endpoints[epid]->tbptr + CONFIG_SYS_IMMR);
770 tx_cbdp->cbd_sc = (TX_BD_I | TX_BD_W);
771
772
773 endpoints[epid]->tptr = endpoints[epid]->tbase;
774 endpoints[epid]->tstate = 0x00;
775 endpoints[epid]->tbcnt = 0x00;
776
777 /* TX start */
778 immr->im_cpm.cp_cpcr = ((epid << 2) | 0x2D01);
779 __asm__ ("eieio");
780 while (immr->im_cpm.cp_cpcr & 0x01);
781
782 return;
783 }
784
785 /* mpc8xx_udc_flush_rx_fifo
786 *
787 * For the sake of completeness of the namespace, it seems like
788 * a good-design-decision (tm) to include mpc8xx_udc_flush_rx_fifo();
789 * If RX_BD_E is true => a driver bug either here or in an upper layer
790 * not polling frequently enough. If RX_BD_E is true we have told the host
791 * we have accepted data but, the CPM found it had no-where to put that data
792 * which needless to say would be a bad thing.
793 */
794 static void mpc8xx_udc_flush_rx_fifo ()
795 {
796 int i = 0;
797
798 for (i = 0; i < RX_RING_SIZE; i++) {
799 if (!(rx_cbd[i]->cbd_sc & RX_BD_E)) {
800 ERR ("buf %p used rx data len = 0x%x sc=0x%x!\n",
801 rx_cbd[i], rx_cbd[i]->cbd_datlen,
802 rx_cbd[i]->cbd_sc);
803
804 }
805 }
806 ERR ("BUG : Input over-run\n");
807 }
808
809 /* mpc8xx_udc_clear_rxbd
810 *
811 * Release control of RX CBD to CP.
812 */
813 static void mpc8xx_udc_clear_rxbd (volatile cbd_t * rx_cbdp)
814 {
815 rx_cbdp->cbd_datlen = 0x0000;
816 rx_cbdp->cbd_sc = ((rx_cbdp->cbd_sc & RX_BD_W) | (RX_BD_E | RX_BD_I));
817 __asm__ ("eieio");
818 }
819
820 /* mpc8xx_udc_tx_irq
821 *
822 * Parse for tx timeout, control RX or USB reset/busy conditions
823 * Return -1 on timeout, -2 on fatal error, else return zero
824 */
825 static int mpc8xx_udc_tx_irq (int ep)
826 {
827 int i = 0;
828
829 if (usbp->usber & (USB_TX_ERRMASK)) {
830 if (mpc8xx_udc_handle_txerr ()) {
831 /* Timeout, controlling function must retry send */
832 return -1;
833 }
834 }
835
836 if (usbp->usber & (USB_E_RESET | USB_E_BSY)) {
837 /* Fatal, abandon TX transaction */
838 return -2;
839 }
840
841 if (usbp->usber & USB_E_RXB) {
842 for (i = 0; i < RX_RING_SIZE; i++) {
843 if (!(rx_cbd[i]->cbd_sc & RX_BD_E)) {
844 if ((rx_cbd[i] == ep_ref[0].prx) || ep) {
845 return -2;
846 }
847 }
848 }
849 }
850
851 return 0;
852 }
853
854 /* mpc8xx_udc_ep_tx
855 *
856 * Transmit in a re-entrant fashion outbound USB packets.
857 * Implement retry/timeout mechanism described in USB specification
858 * Toggle DATA0/DATA1 pids as necessary
859 * Introduces non-standard tx_retry. The USB standard has no scope for slave
860 * devices to give up TX, however tx_retry stops us getting stuck in an endless
861 * TX loop.
862 */
863 static int mpc8xx_udc_ep_tx (struct usb_endpoint_instance *epi)
864 {
865 struct urb *urb = epi->tx_urb;
866 volatile cbd_t *tx_cbdp = 0;
867 unsigned int ep = 0, pkt_len = 0, x = 0, tx_retry = 0;
868 int ret = 0;
869
870 if (!epi || (epi->endpoint_address & 0x03) >= MAX_ENDPOINTS || !urb) {
871 return -1;
872 }
873
874 ep = epi->endpoint_address & 0x03;
875 tx_cbdp = (cbd_t *) (endpoints[ep]->tbptr + CONFIG_SYS_IMMR);
876
877 if (tx_cbdp->cbd_sc & TX_BD_R || usbp->usber & USB_E_TXB) {
878 mpc8xx_udc_flush_tx_fifo (ep);
879 usbp->usber |= USB_E_TXB;
880 };
881
882 while (tx_retry++ < 100) {
883 ret = mpc8xx_udc_tx_irq (ep);
884 if (ret == -1) {
885 /* ignore timeout here */
886 } else if (ret == -2) {
887 /* Abandon TX */
888 mpc8xx_udc_flush_tx_fifo (ep);
889 return -1;
890 }
891
892 tx_cbdp = (cbd_t *) (endpoints[ep]->tbptr + CONFIG_SYS_IMMR);
893 while (tx_cbdp->cbd_sc & TX_BD_R) {
894 };
895 tx_cbdp->cbd_sc = (tx_cbdp->cbd_sc & TX_BD_W);
896
897 pkt_len = urb->actual_length - epi->sent;
898
899 if (pkt_len > epi->tx_packetSize || pkt_len > EP_MAX_PKT) {
900 pkt_len = min(epi->tx_packetSize, EP_MAX_PKT);
901 }
902
903 for (x = 0; x < pkt_len; x++) {
904 *((unsigned char *) (tx_cbdp->cbd_bufaddr + x)) =
905 urb->buffer[epi->sent + x];
906 }
907 tx_cbdp->cbd_datlen = pkt_len;
908 tx_cbdp->cbd_sc |= (CBD_TX_BITMASK | ep_ref[ep].pid);
909 __asm__ ("eieio");
910
911 #ifdef __SIMULATE_ERROR__
912 if (++err_poison_test == 2) {
913 err_poison_test = 0;
914 tx_cbdp->cbd_sc &= ~TX_BD_TC;
915 }
916 #endif
917
918 usbp->uscom = (USCOM_STR | ep);
919
920 while (!(usbp->usber & USB_E_TXB)) {
921 ret = mpc8xx_udc_tx_irq (ep);
922 if (ret == -1) {
923 /* TX timeout */
924 break;
925 } else if (ret == -2) {
926 if (usbp->usber & USB_E_TXB) {
927 usbp->usber |= USB_E_TXB;
928 }
929 mpc8xx_udc_flush_tx_fifo (ep);
930 return -1;
931 }
932 };
933
934 if (usbp->usber & USB_E_TXB) {
935 usbp->usber |= USB_E_TXB;
936 }
937
938 /* ACK must be present <= 18bit times from TX */
939 if (ret == -1) {
940 continue;
941 }
942
943 /* TX ACK : USB 2.0 8.7.2, Toggle PID, Advance TX */
944 epi->sent += pkt_len;
945 epi->last = min(urb->actual_length - epi->sent, epi->tx_packetSize);
946 TOGGLE_TX_PID (ep_ref[ep].pid);
947
948 if (epi->sent >= epi->tx_urb->actual_length) {
949
950 epi->tx_urb->actual_length = 0;
951 epi->sent = 0;
952
953 if (ep_ref[ep].sc & EP_SEND_ZLP) {
954 ep_ref[ep].sc &= ~EP_SEND_ZLP;
955 } else {
956 return 0;
957 }
958 }
959 }
960
961 ERR ("TX fail, endpoint 0x%x tx bytes 0x%x/0x%x\n", ep, epi->sent,
962 epi->tx_urb->actual_length);
963
964 return -1;
965 }
966
967 /* mpc8xx_udc_dump_request
968 *
969 * Dump a control request to console
970 */
971 static void mpc8xx_udc_dump_request (struct usb_device_request *request)
972 {
973 DBG ("bmRequestType:%02x bRequest:%02x wValue:%04x "
974 "wIndex:%04x wLength:%04x ?\n",
975 request->bmRequestType,
976 request->bRequest,
977 request->wValue, request->wIndex, request->wLength);
978
979 return;
980 }
981
982 /* mpc8xx_udc_ep0_rx_setup
983 *
984 * Decode received ep0 SETUP packet. return non-zero on error
985 */
986 static int mpc8xx_udc_ep0_rx_setup (volatile cbd_t * rx_cbdp)
987 {
988 unsigned int x = 0;
989 struct urb *purb = ep_ref[0].urb;
990 struct usb_endpoint_instance *epi =
991 &udc_device->bus->endpoint_array[0];
992
993 for (; x < rx_cbdp->cbd_datlen; x++) {
994 *(((unsigned char *) &ep_ref[0].urb->device_request) + x) =
995 *((unsigned char *) (rx_cbdp->cbd_bufaddr + x));
996 }
997
998 mpc8xx_udc_clear_rxbd (rx_cbdp);
999
1000 if (ep0_recv_setup (purb)) {
1001 mpc8xx_udc_dump_request (&purb->device_request);
1002 return -1;
1003 }
1004
1005 if ((purb->device_request.bmRequestType & USB_REQ_DIRECTION_MASK)
1006 == USB_REQ_HOST2DEVICE) {
1007
1008 switch (purb->device_request.bRequest) {
1009 case USB_REQ_SET_ADDRESS:
1010 /* Send the Status OUT ZLP */
1011 ep_ref[0].pid = TX_BD_PID_DATA1;
1012 purb->actual_length = 0;
1013 mpc8xx_udc_init_tx (epi, purb);
1014 mpc8xx_udc_ep_tx (epi);
1015
1016 /* Move to the addressed state */
1017 usbp->usaddr = udc_device->address;
1018 mpc8xx_udc_state_transition_up (udc_device->device_state,
1019 STATE_ADDRESSED);
1020 return 0;
1021
1022 case USB_REQ_SET_CONFIGURATION:
1023 if (!purb->device_request.wValue) {
1024 /* Respond at default address */
1025 usbp->usaddr = 0x00;
1026 mpc8xx_udc_state_transition_down (udc_device->device_state,
1027 STATE_ADDRESSED);
1028 } else {
1029 /* TODO: Support multiple configurations */
1030 mpc8xx_udc_state_transition_up (udc_device->device_state,
1031 STATE_CONFIGURED);
1032 for (x = 1; x < MAX_ENDPOINTS; x++) {
1033 if ((udc_device->bus->endpoint_array[x].endpoint_address & USB_ENDPOINT_DIR_MASK)
1034 == USB_DIR_IN) {
1035 ep_ref[x].pid = TX_BD_PID_DATA0;
1036 } else {
1037 ep_ref[x].pid = RX_BD_PID_DATA0;
1038 }
1039 /* Set configuration must unstall endpoints */
1040 usbp->usep[x] &= ~STALL_BITMASK;
1041 }
1042 }
1043 break;
1044 default:
1045 /* CDC/Vendor specific */
1046 break;
1047 }
1048
1049 /* Send ZLP as ACK in Status OUT phase */
1050 ep_ref[0].pid = TX_BD_PID_DATA1;
1051 purb->actual_length = 0;
1052 mpc8xx_udc_init_tx (epi, purb);
1053 mpc8xx_udc_ep_tx (epi);
1054
1055 } else {
1056
1057 if (purb->actual_length) {
1058 ep_ref[0].pid = TX_BD_PID_DATA1;
1059 mpc8xx_udc_init_tx (epi, purb);
1060
1061 if (!(purb->actual_length % EP0_MAX_PACKET_SIZE)) {
1062 ep_ref[0].sc |= EP_SEND_ZLP;
1063 }
1064
1065 if (purb->device_request.wValue ==
1066 USB_DESCRIPTOR_TYPE_DEVICE) {
1067 if (le16_to_cpu (purb->device_request.wLength)
1068 > purb->actual_length) {
1069 /* Send EP0_MAX_PACKET_SIZE bytes
1070 * unless correct size requested.
1071 */
1072 if (purb->actual_length > epi->tx_packetSize) {
1073 purb->actual_length = epi->tx_packetSize;
1074 }
1075 }
1076 }
1077 mpc8xx_udc_ep_tx (epi);
1078
1079 } else {
1080 /* Corrupt SETUP packet? */
1081 ERR ("Zero length data or SETUP with DATA-IN phase ?\n");
1082 return 1;
1083 }
1084 }
1085 return 0;
1086 }
1087
1088 /* mpc8xx_udc_init_tx
1089 *
1090 * Setup some basic parameters for a TX transaction
1091 */
1092 static void mpc8xx_udc_init_tx (struct usb_endpoint_instance *epi,
1093 struct urb *tx_urb)
1094 {
1095 epi->sent = 0;
1096 epi->last = 0;
1097 epi->tx_urb = tx_urb;
1098 }
1099
1100 /* mpc8xx_udc_ep0_rx
1101 *
1102 * Receive ep0/control USB data. Parse and possibly send a response.
1103 */
1104 static void mpc8xx_udc_ep0_rx (volatile cbd_t * rx_cbdp)
1105 {
1106 if (rx_cbdp->cbd_sc & RX_BD_PID_SETUP) {
1107
1108 /* Unconditionally accept SETUP packets */
1109 if (mpc8xx_udc_ep0_rx_setup (rx_cbdp)) {
1110 mpc8xx_udc_stall (0);
1111 }
1112
1113 } else {
1114
1115 mpc8xx_udc_clear_rxbd (rx_cbdp);
1116
1117 if ((rx_cbdp->cbd_datlen - 2)) {
1118 /* SETUP with a DATA phase
1119 * outside of SETUP packet.
1120 * Reply with STALL.
1121 */
1122 mpc8xx_udc_stall (0);
1123 }
1124 }
1125 }
1126
1127 /* mpc8xx_udc_epn_rx
1128 *
1129 * Receive some data from cbd into USB system urb data abstraction
1130 * Upper layers should NAK if there is insufficient RX data space
1131 */
1132 static int mpc8xx_udc_epn_rx (unsigned int epid, volatile cbd_t * rx_cbdp)
1133 {
1134 struct usb_endpoint_instance *epi = 0;
1135 struct urb *urb = 0;
1136 unsigned int x = 0;
1137
1138 if (epid >= MAX_ENDPOINTS || !rx_cbdp->cbd_datlen) {
1139 return 0;
1140 }
1141
1142 /* USB 2.0 PDF section 8.6.4
1143 * Discard data with invalid PID it is a resend.
1144 */
1145 if (ep_ref[epid].pid != (rx_cbdp->cbd_sc & 0xC0)) {
1146 return 1;
1147 }
1148 TOGGLE_RX_PID (ep_ref[epid].pid);
1149
1150 epi = &udc_device->bus->endpoint_array[epid];
1151 urb = epi->rcv_urb;
1152
1153 for (; x < (rx_cbdp->cbd_datlen - 2); x++) {
1154 *((unsigned char *) (urb->buffer + urb->actual_length + x)) =
1155 *((unsigned char *) (rx_cbdp->cbd_bufaddr + x));
1156 }
1157
1158 if (x) {
1159 usbd_rcv_complete (epi, x, 0);
1160 if (ep_ref[epid].urb->status == RECV_ERROR) {
1161 DBG ("RX error unset NAK\n");
1162 udc_unset_nak (epid);
1163 }
1164 }
1165 return x;
1166 }
1167
1168 /* mpc8xx_udc_clock_init
1169 *
1170 * Obtain a clock reference for Full Speed Signaling
1171 */
1172 static void mpc8xx_udc_clock_init (volatile immap_t * immr,
1173 volatile cpm8xx_t * cp)
1174 {
1175
1176 #if defined(CONFIG_SYS_USB_EXTC_CLK)
1177
1178 /* This has been tested with a 48MHz crystal on CLK6 */
1179 switch (CONFIG_SYS_USB_EXTC_CLK) {
1180 case 1:
1181 immr->im_ioport.iop_papar |= 0x0100;
1182 immr->im_ioport.iop_padir &= ~0x0100;
1183 cp->cp_sicr |= 0x24;
1184 break;
1185 case 2:
1186 immr->im_ioport.iop_papar |= 0x0200;
1187 immr->im_ioport.iop_padir &= ~0x0200;
1188 cp->cp_sicr |= 0x2D;
1189 break;
1190 case 3:
1191 immr->im_ioport.iop_papar |= 0x0400;
1192 immr->im_ioport.iop_padir &= ~0x0400;
1193 cp->cp_sicr |= 0x36;
1194 break;
1195 case 4:
1196 immr->im_ioport.iop_papar |= 0x0800;
1197 immr->im_ioport.iop_padir &= ~0x0800;
1198 cp->cp_sicr |= 0x3F;
1199 break;
1200 default:
1201 udc_state = STATE_ERROR;
1202 break;
1203 }
1204
1205 #elif defined(CONFIG_SYS_USB_BRGCLK)
1206
1207 /* This has been tested with brgclk == 50MHz */
1208 int divisor = 0;
1209
1210 if (gd->cpu_clk < 48000000L) {
1211 ERR ("brgclk is too slow for full-speed USB!\n");
1212 udc_state = STATE_ERROR;
1213 return;
1214 }
1215
1216 /* Assume the brgclk is 'good enough', we want !(gd->cpu_clk%48MHz)
1217 * but, can /probably/ live with close-ish alternative rates.
1218 */
1219 divisor = (gd->cpu_clk / 48000000L) - 1;
1220 cp->cp_sicr &= ~0x0000003F;
1221
1222 switch (CONFIG_SYS_USB_BRGCLK) {
1223 case 1:
1224 cp->cp_brgc1 |= (divisor | CPM_BRG_EN);
1225 cp->cp_sicr &= ~0x2F;
1226 break;
1227 case 2:
1228 cp->cp_brgc2 |= (divisor | CPM_BRG_EN);
1229 cp->cp_sicr |= 0x00000009;
1230 break;
1231 case 3:
1232 cp->cp_brgc3 |= (divisor | CPM_BRG_EN);
1233 cp->cp_sicr |= 0x00000012;
1234 break;
1235 case 4:
1236 cp->cp_brgc4 = (divisor | CPM_BRG_EN);
1237 cp->cp_sicr |= 0x0000001B;
1238 break;
1239 default:
1240 udc_state = STATE_ERROR;
1241 break;
1242 }
1243
1244 #else
1245 #error "CONFIG_SYS_USB_EXTC_CLK or CONFIG_SYS_USB_BRGCLK must be defined"
1246 #endif
1247
1248 }
1249
1250 /* mpc8xx_udc_cbd_attach
1251 *
1252 * attach a cbd to and endpoint
1253 */
1254 static void mpc8xx_udc_cbd_attach (int ep, uchar tx_size, uchar rx_size)
1255 {
1256
1257 if (!tx_cbd[ep] || !rx_cbd[ep] || ep >= MAX_ENDPOINTS) {
1258 udc_state = STATE_ERROR;
1259 return;
1260 }
1261
1262 if (tx_size > USB_MAX_PKT || rx_size > USB_MAX_PKT ||
1263 (!tx_size && !rx_size)) {
1264 udc_state = STATE_ERROR;
1265 return;
1266 }
1267
1268 /* Attach CBD to appropiate Parameter RAM Endpoint data structure */
1269 if (rx_size) {
1270 endpoints[ep]->rbase = (u32) rx_cbd[rx_ct];
1271 endpoints[ep]->rbptr = (u32) rx_cbd[rx_ct];
1272 rx_ct++;
1273
1274 if (!ep) {
1275
1276 endpoints[ep]->rbptr = (u32) rx_cbd[rx_ct];
1277 rx_cbd[rx_ct]->cbd_sc |= RX_BD_W;
1278 rx_ct++;
1279
1280 } else {
1281 rx_ct += 2;
1282 endpoints[ep]->rbptr = (u32) rx_cbd[rx_ct];
1283 rx_cbd[rx_ct]->cbd_sc |= RX_BD_W;
1284 rx_ct++;
1285 }
1286
1287 /* Where we expect to RX data on this endpoint */
1288 ep_ref[ep].prx = rx_cbd[rx_ct - 1];
1289 } else {
1290
1291 ep_ref[ep].prx = 0;
1292 endpoints[ep]->rbase = 0;
1293 endpoints[ep]->rbptr = 0;
1294 }
1295
1296 if (tx_size) {
1297 endpoints[ep]->tbase = (u32) tx_cbd[tx_ct];
1298 endpoints[ep]->tbptr = (u32) tx_cbd[tx_ct];
1299 tx_ct++;
1300 } else {
1301 endpoints[ep]->tbase = 0;
1302 endpoints[ep]->tbptr = 0;
1303 }
1304
1305 endpoints[ep]->tstate = 0;
1306 endpoints[ep]->tbcnt = 0;
1307 endpoints[ep]->mrblr = EP_MAX_PKT;
1308 endpoints[ep]->rfcr = 0x18;
1309 endpoints[ep]->tfcr = 0x18;
1310 ep_ref[ep].sc |= EP_ATTACHED;
1311
1312 DBG ("ep %d rbase 0x%08x rbptr 0x%08x tbase 0x%08x tbptr 0x%08x prx = %p\n",
1313 ep, endpoints[ep]->rbase, endpoints[ep]->rbptr,
1314 endpoints[ep]->tbase, endpoints[ep]->tbptr,
1315 ep_ref[ep].prx);
1316
1317 return;
1318 }
1319
1320 /* mpc8xx_udc_cbd_init
1321 *
1322 * Allocate space for a cbd and allocate TX/RX data space
1323 */
1324 static void mpc8xx_udc_cbd_init (void)
1325 {
1326 int i = 0;
1327
1328 for (; i < TX_RING_SIZE; i++) {
1329 tx_cbd[i] = (cbd_t *)
1330 mpc8xx_udc_alloc (sizeof (cbd_t), sizeof (int));
1331 }
1332
1333 for (i = 0; i < RX_RING_SIZE; i++) {
1334 rx_cbd[i] = (cbd_t *)
1335 mpc8xx_udc_alloc (sizeof (cbd_t), sizeof (int));
1336 }
1337
1338 for (i = 0; i < TX_RING_SIZE; i++) {
1339 tx_cbd[i]->cbd_bufaddr =
1340 mpc8xx_udc_alloc (EP_MAX_PKT, sizeof (int));
1341
1342 tx_cbd[i]->cbd_sc = (TX_BD_I | TX_BD_W);
1343 tx_cbd[i]->cbd_datlen = 0x0000;
1344 }
1345
1346
1347 for (i = 0; i < RX_RING_SIZE; i++) {
1348 rx_cbd[i]->cbd_bufaddr =
1349 mpc8xx_udc_alloc (EP_MAX_PKT, sizeof (int));
1350 rx_cbd[i]->cbd_sc = (RX_BD_I | RX_BD_E);
1351 rx_cbd[i]->cbd_datlen = 0x0000;
1352
1353 }
1354
1355 return;
1356 }
1357
1358 /* mpc8xx_udc_endpoint_init
1359 *
1360 * Attach an endpoint to some dpram
1361 */
1362 static void mpc8xx_udc_endpoint_init (void)
1363 {
1364 int i = 0;
1365
1366 for (; i < MAX_ENDPOINTS; i++) {
1367 endpoints[i] = (usb_epb_t *)
1368 mpc8xx_udc_alloc (sizeof (usb_epb_t), 32);
1369 }
1370 }
1371
1372 /* mpc8xx_udc_alloc
1373 *
1374 * Grab the address of some dpram
1375 */
1376 static u32 mpc8xx_udc_alloc (u32 data_size, u32 alignment)
1377 {
1378 u32 retaddr = address_base;
1379
1380 while (retaddr % alignment) {
1381 retaddr++;
1382 }
1383 address_base += data_size;
1384
1385 return retaddr;
1386 }
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