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1/*
2 * Driver for the PLX NET2280 USB device controller.
3 * Specs and errata are available from <http://www.plxtech.com>.
4 *
5 * PLX Technology Inc. (formerly NetChip Technology) supported the
6 * development of this driver.
7 *
8 *
9 * CODE STATUS HIGHLIGHTS
10 *
11 * This driver should work well with most "gadget" drivers, including
12 * the File Storage, Serial, and Ethernet/RNDIS gadget drivers
13 * as well as Gadget Zero and Gadgetfs.
14 *
15 * DMA is enabled by default. Drivers using transfer queues might use
16 * DMA chaining to remove IRQ latencies between transfers. (Except when
17 * short OUT transfers happen.) Drivers can use the req->no_interrupt
18 * hint to completely eliminate some IRQs, if a later IRQ is guaranteed
19 * and DMA chaining is enabled.
20 *
21 * Note that almost all the errata workarounds here are only needed for
22 * rev1 chips. Rev1a silicon (0110) fixes almost all of them.
23 */
24
25/*
26 * Copyright (C) 2003 David Brownell
27 * Copyright (C) 2003-2005 PLX Technology, Inc.
28 *
29 * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
30 * with 2282 chip
31 *
32 * This program is free software; you can redistribute it and/or modify
33 * it under the terms of the GNU General Public License as published by
34 * the Free Software Foundation; either version 2 of the License, or
35 * (at your option) any later version.
36 *
37 * This program is distributed in the hope that it will be useful,
38 * but WITHOUT ANY WARRANTY; without even the implied warranty of
39 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
40 * GNU General Public License for more details.
41 *
42 * You should have received a copy of the GNU General Public License
43 * along with this program; if not, write to the Free Software
44 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
45 */
46
47#undef DEBUG /* messages on error and most fault paths */
48#undef VERBOSE /* extra debug messages (success too) */
49
50#include <linux/module.h>
51#include <linux/pci.h>
52#include <linux/dma-mapping.h>
53#include <linux/kernel.h>
54#include <linux/delay.h>
55#include <linux/ioport.h>
56#include <linux/slab.h>
57#include <linux/errno.h>
58#include <linux/init.h>
59#include <linux/timer.h>
60#include <linux/list.h>
61#include <linux/interrupt.h>
62#include <linux/moduleparam.h>
63#include <linux/device.h>
64#include <linux/usb/ch9.h>
65#include <linux/usb/gadget.h>
66#include <linux/prefetch.h>
67
68#include <asm/byteorder.h>
69#include <asm/io.h>
70#include <asm/irq.h>
71#include <asm/system.h>
72#include <asm/unaligned.h>
73
74
75#define DRIVER_DESC "PLX NET228x USB Peripheral Controller"
76#define DRIVER_VERSION "2005 Sept 27"
77
78#define DMA_ADDR_INVALID (~(dma_addr_t)0)
79#define EP_DONTUSE 13 /* nonzero */
80
81#define USE_RDK_LEDS /* GPIO pins control three LEDs */
82
83
84static const char driver_name [] = "net2280";
85static const char driver_desc [] = DRIVER_DESC;
86
87static const char ep0name [] = "ep0";
88static const char *const ep_name [] = {
89 ep0name,
90 "ep-a", "ep-b", "ep-c", "ep-d",
91 "ep-e", "ep-f",
92};
93
94/* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO)
95 * use_dma_chaining -- dma descriptor queueing gives even more irq reduction
96 *
97 * The net2280 DMA engines are not tightly integrated with their FIFOs;
98 * not all cases are (yet) handled well in this driver or the silicon.
99 * Some gadget drivers work better with the dma support here than others.
100 * These two parameters let you use PIO or more aggressive DMA.
101 */
102static int use_dma = 1;
103static int use_dma_chaining = 0;
104
105/* "modprobe net2280 use_dma=n" etc */
106module_param (use_dma, bool, S_IRUGO);
107module_param (use_dma_chaining, bool, S_IRUGO);
108
109
110/* mode 0 == ep-{a,b,c,d} 1K fifo each
111 * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
112 * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
113 */
114static ushort fifo_mode = 0;
115
116/* "modprobe net2280 fifo_mode=1" etc */
117module_param (fifo_mode, ushort, 0644);
118
119/* enable_suspend -- When enabled, the driver will respond to
120 * USB suspend requests by powering down the NET2280. Otherwise,
121 * USB suspend requests will be ignored. This is acceptable for
122 * self-powered devices
123 */
124static int enable_suspend = 0;
125
126/* "modprobe net2280 enable_suspend=1" etc */
127module_param (enable_suspend, bool, S_IRUGO);
128
129
130#define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
131
132#if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG)
133static char *type_string (u8 bmAttributes)
134{
135 switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
136 case USB_ENDPOINT_XFER_BULK: return "bulk";
137 case USB_ENDPOINT_XFER_ISOC: return "iso";
138 case USB_ENDPOINT_XFER_INT: return "intr";
139 };
140 return "control";
141}
142#endif
143
144#include "net2280.h"
145
146#define valid_bit cpu_to_le32 (1 << VALID_BIT)
147#define dma_done_ie cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE)
148
149/*-------------------------------------------------------------------------*/
150
151static int
152net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
153{
154 struct net2280 *dev;
155 struct net2280_ep *ep;
156 u32 max, tmp;
157 unsigned long flags;
158
159 ep = container_of (_ep, struct net2280_ep, ep);
160 if (!_ep || !desc || ep->desc || _ep->name == ep0name
161 || desc->bDescriptorType != USB_DT_ENDPOINT)
162 return -EINVAL;
163 dev = ep->dev;
164 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
165 return -ESHUTDOWN;
166
167 /* erratum 0119 workaround ties up an endpoint number */
168 if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE)
169 return -EDOM;
170
171 /* sanity check ep-e/ep-f since their fifos are small */
172 max = le16_to_cpu (desc->wMaxPacketSize) & 0x1fff;
173 if (ep->num > 4 && max > 64)
174 return -ERANGE;
175
176 spin_lock_irqsave (&dev->lock, flags);
177 _ep->maxpacket = max & 0x7ff;
178 ep->desc = desc;
179
180 /* ep_reset() has already been called */
181 ep->stopped = 0;
182 ep->wedged = 0;
183 ep->out_overflow = 0;
184
185 /* set speed-dependent max packet; may kick in high bandwidth */
186 set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max);
187
188 /* FIFO lines can't go to different packets. PIO is ok, so
189 * use it instead of troublesome (non-bulk) multi-packet DMA.
190 */
191 if (ep->dma && (max % 4) != 0 && use_dma_chaining) {
192 DEBUG (ep->dev, "%s, no dma for maxpacket %d\n",
193 ep->ep.name, ep->ep.maxpacket);
194 ep->dma = NULL;
195 }
196
197 /* set type, direction, address; reset fifo counters */
198 writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
199 tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
200 if (tmp == USB_ENDPOINT_XFER_INT) {
201 /* erratum 0105 workaround prevents hs NYET */
202 if (dev->chiprev == 0100
203 && dev->gadget.speed == USB_SPEED_HIGH
204 && !(desc->bEndpointAddress & USB_DIR_IN))
205 writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE),
206 &ep->regs->ep_rsp);
207 } else if (tmp == USB_ENDPOINT_XFER_BULK) {
208 /* catch some particularly blatant driver bugs */
209 if ((dev->gadget.speed == USB_SPEED_HIGH
210 && max != 512)
211 || (dev->gadget.speed == USB_SPEED_FULL
212 && max > 64)) {
213 spin_unlock_irqrestore (&dev->lock, flags);
214 return -ERANGE;
215 }
216 }
217 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0;
218 tmp <<= ENDPOINT_TYPE;
219 tmp |= desc->bEndpointAddress;
220 tmp |= (4 << ENDPOINT_BYTE_COUNT); /* default full fifo lines */
221 tmp |= 1 << ENDPOINT_ENABLE;
222 wmb ();
223
224 /* for OUT transfers, block the rx fifo until a read is posted */
225 ep->is_in = (tmp & USB_DIR_IN) != 0;
226 if (!ep->is_in)
227 writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
228 else if (dev->pdev->device != 0x2280) {
229 /* Added for 2282, Don't use nak packets on an in endpoint,
230 * this was ignored on 2280
231 */
232 writel ((1 << CLEAR_NAK_OUT_PACKETS)
233 | (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
234 }
235
236 writel (tmp, &ep->regs->ep_cfg);
237
238 /* enable irqs */
239 if (!ep->dma) { /* pio, per-packet */
240 tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
241 writel (tmp, &dev->regs->pciirqenb0);
242
243 tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
244 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
245 if (dev->pdev->device == 0x2280)
246 tmp |= readl (&ep->regs->ep_irqenb);
247 writel (tmp, &ep->regs->ep_irqenb);
248 } else { /* dma, per-request */
249 tmp = (1 << (8 + ep->num)); /* completion */
250 tmp |= readl (&dev->regs->pciirqenb1);
251 writel (tmp, &dev->regs->pciirqenb1);
252
253 /* for short OUT transfers, dma completions can't
254 * advance the queue; do it pio-style, by hand.
255 * NOTE erratum 0112 workaround #2
256 */
257 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
258 tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
259 writel (tmp, &ep->regs->ep_irqenb);
260
261 tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
262 writel (tmp, &dev->regs->pciirqenb0);
263 }
264 }
265
266 tmp = desc->bEndpointAddress;
267 DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
268 _ep->name, tmp & 0x0f, DIR_STRING (tmp),
269 type_string (desc->bmAttributes),
270 ep->dma ? "dma" : "pio", max);
271
272 /* pci writes may still be posted */
273 spin_unlock_irqrestore (&dev->lock, flags);
274 return 0;
275}
276
277static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec)
278{
279 u32 result;
280
281 do {
282 result = readl (ptr);
283 if (result == ~(u32)0) /* "device unplugged" */
284 return -ENODEV;
285 result &= mask;
286 if (result == done)
287 return 0;
288 udelay (1);
289 usec--;
290 } while (usec > 0);
291 return -ETIMEDOUT;
292}
293
294static const struct usb_ep_ops net2280_ep_ops;
295
296static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep)
297{
298 u32 tmp;
299
300 ep->desc = NULL;
301 INIT_LIST_HEAD (&ep->queue);
302
303 ep->ep.maxpacket = ~0;
304 ep->ep.ops = &net2280_ep_ops;
305
306 /* disable the dma, irqs, endpoint... */
307 if (ep->dma) {
308 writel (0, &ep->dma->dmactl);
309 writel ( (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
310 | (1 << DMA_TRANSACTION_DONE_INTERRUPT)
311 | (1 << DMA_ABORT)
312 , &ep->dma->dmastat);
313
314 tmp = readl (®s->pciirqenb0);
315 tmp &= ~(1 << ep->num);
316 writel (tmp, ®s->pciirqenb0);
317 } else {
318 tmp = readl (®s->pciirqenb1);
319 tmp &= ~(1 << (8 + ep->num)); /* completion */
320 writel (tmp, ®s->pciirqenb1);
321 }
322 writel (0, &ep->regs->ep_irqenb);
323
324 /* init to our chosen defaults, notably so that we NAK OUT
325 * packets until the driver queues a read (+note erratum 0112)
326 */
327 if (!ep->is_in || ep->dev->pdev->device == 0x2280) {
328 tmp = (1 << SET_NAK_OUT_PACKETS_MODE)
329 | (1 << SET_NAK_OUT_PACKETS)
330 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
331 | (1 << CLEAR_INTERRUPT_MODE);
332 } else {
333 /* added for 2282 */
334 tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE)
335 | (1 << CLEAR_NAK_OUT_PACKETS)
336 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
337 | (1 << CLEAR_INTERRUPT_MODE);
338 }
339
340 if (ep->num != 0) {
341 tmp |= (1 << CLEAR_ENDPOINT_TOGGLE)
342 | (1 << CLEAR_ENDPOINT_HALT);
343 }
344 writel (tmp, &ep->regs->ep_rsp);
345
346 /* scrub most status bits, and flush any fifo state */
347 if (ep->dev->pdev->device == 0x2280)
348 tmp = (1 << FIFO_OVERFLOW)
349 | (1 << FIFO_UNDERFLOW);
350 else
351 tmp = 0;
352
353 writel (tmp | (1 << TIMEOUT)
354 | (1 << USB_STALL_SENT)
355 | (1 << USB_IN_NAK_SENT)
356 | (1 << USB_IN_ACK_RCVD)
357 | (1 << USB_OUT_PING_NAK_SENT)
358 | (1 << USB_OUT_ACK_SENT)
359 | (1 << FIFO_FLUSH)
360 | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
361 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
362 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
363 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
364 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
365 | (1 << DATA_IN_TOKEN_INTERRUPT)
366 , &ep->regs->ep_stat);
367
368 /* fifo size is handled separately */
369}
370
371static void nuke (struct net2280_ep *);
372
373static int net2280_disable (struct usb_ep *_ep)
374{
375 struct net2280_ep *ep;
376 unsigned long flags;
377
378 ep = container_of (_ep, struct net2280_ep, ep);
379 if (!_ep || !ep->desc || _ep->name == ep0name)
380 return -EINVAL;
381
382 spin_lock_irqsave (&ep->dev->lock, flags);
383 nuke (ep);
384 ep_reset (ep->dev->regs, ep);
385
386 VDEBUG (ep->dev, "disabled %s %s\n",
387 ep->dma ? "dma" : "pio", _ep->name);
388
389 /* synch memory views with the device */
390 (void) readl (&ep->regs->ep_cfg);
391
392 if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4)
393 ep->dma = &ep->dev->dma [ep->num - 1];
394
395 spin_unlock_irqrestore (&ep->dev->lock, flags);
396 return 0;
397}
398
399/*-------------------------------------------------------------------------*/
400
401static struct usb_request *
402net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
403{
404 struct net2280_ep *ep;
405 struct net2280_request *req;
406
407 if (!_ep)
408 return NULL;
409 ep = container_of (_ep, struct net2280_ep, ep);
410
411 req = kzalloc(sizeof(*req), gfp_flags);
412 if (!req)
413 return NULL;
414
415 req->req.dma = DMA_ADDR_INVALID;
416 INIT_LIST_HEAD (&req->queue);
417
418 /* this dma descriptor may be swapped with the previous dummy */
419 if (ep->dma) {
420 struct net2280_dma *td;
421
422 td = pci_pool_alloc (ep->dev->requests, gfp_flags,
423 &req->td_dma);
424 if (!td) {
425 kfree (req);
426 return NULL;
427 }
428 td->dmacount = 0; /* not VALID */
429 td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
430 td->dmadesc = td->dmaaddr;
431 req->td = td;
432 }
433 return &req->req;
434}
435
436static void
437net2280_free_request (struct usb_ep *_ep, struct usb_request *_req)
438{
439 struct net2280_ep *ep;
440 struct net2280_request *req;
441
442 ep = container_of (_ep, struct net2280_ep, ep);
443 if (!_ep || !_req)
444 return;
445
446 req = container_of (_req, struct net2280_request, req);
447 WARN_ON (!list_empty (&req->queue));
448 if (req->td)
449 pci_pool_free (ep->dev->requests, req->td, req->td_dma);
450 kfree (req);
451}
452
453/*-------------------------------------------------------------------------*/
454
455/* load a packet into the fifo we use for usb IN transfers.
456 * works for all endpoints.
457 *
458 * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
459 * at a time, but this code is simpler because it knows it only writes
460 * one packet. ep-a..ep-d should use dma instead.
461 */
462static void
463write_fifo (struct net2280_ep *ep, struct usb_request *req)
464{
465 struct net2280_ep_regs __iomem *regs = ep->regs;
466 u8 *buf;
467 u32 tmp;
468 unsigned count, total;
469
470 /* INVARIANT: fifo is currently empty. (testable) */
471
472 if (req) {
473 buf = req->buf + req->actual;
474 prefetch (buf);
475 total = req->length - req->actual;
476 } else {
477 total = 0;
478 buf = NULL;
479 }
480
481 /* write just one packet at a time */
482 count = ep->ep.maxpacket;
483 if (count > total) /* min() cannot be used on a bitfield */
484 count = total;
485
486 VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
487 ep->ep.name, count,
488 (count != ep->ep.maxpacket) ? " (short)" : "",
489 req);
490 while (count >= 4) {
491 /* NOTE be careful if you try to align these. fifo lines
492 * should normally be full (4 bytes) and successive partial
493 * lines are ok only in certain cases.
494 */
495 tmp = get_unaligned ((u32 *)buf);
496 cpu_to_le32s (&tmp);
497 writel (tmp, ®s->ep_data);
498 buf += 4;
499 count -= 4;
500 }
501
502 /* last fifo entry is "short" unless we wrote a full packet.
503 * also explicitly validate last word in (periodic) transfers
504 * when maxpacket is not a multiple of 4 bytes.
505 */
506 if (count || total < ep->ep.maxpacket) {
507 tmp = count ? get_unaligned ((u32 *)buf) : count;
508 cpu_to_le32s (&tmp);
509 set_fifo_bytecount (ep, count & 0x03);
510 writel (tmp, ®s->ep_data);
511 }
512
513 /* pci writes may still be posted */
514}
515
516/* work around erratum 0106: PCI and USB race over the OUT fifo.
517 * caller guarantees chiprev 0100, out endpoint is NAKing, and
518 * there's no real data in the fifo.
519 *
520 * NOTE: also used in cases where that erratum doesn't apply:
521 * where the host wrote "too much" data to us.
522 */
523static void out_flush (struct net2280_ep *ep)
524{
525 u32 __iomem *statp;
526 u32 tmp;
527
528 ASSERT_OUT_NAKING (ep);
529
530 statp = &ep->regs->ep_stat;
531 writel ( (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
532 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
533 , statp);
534 writel ((1 << FIFO_FLUSH), statp);
535 mb ();
536 tmp = readl (statp);
537 if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
538 /* high speed did bulk NYET; fifo isn't filling */
539 && ep->dev->gadget.speed == USB_SPEED_FULL) {
540 unsigned usec;
541
542 usec = 50; /* 64 byte bulk/interrupt */
543 handshake (statp, (1 << USB_OUT_PING_NAK_SENT),
544 (1 << USB_OUT_PING_NAK_SENT), usec);
545 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
546 }
547}
548
549/* unload packet(s) from the fifo we use for usb OUT transfers.
550 * returns true iff the request completed, because of short packet
551 * or the request buffer having filled with full packets.
552 *
553 * for ep-a..ep-d this will read multiple packets out when they
554 * have been accepted.
555 */
556static int
557read_fifo (struct net2280_ep *ep, struct net2280_request *req)
558{
559 struct net2280_ep_regs __iomem *regs = ep->regs;
560 u8 *buf = req->req.buf + req->req.actual;
561 unsigned count, tmp, is_short;
562 unsigned cleanup = 0, prevent = 0;
563
564 /* erratum 0106 ... packets coming in during fifo reads might
565 * be incompletely rejected. not all cases have workarounds.
566 */
567 if (ep->dev->chiprev == 0x0100
568 && ep->dev->gadget.speed == USB_SPEED_FULL) {
569 udelay (1);
570 tmp = readl (&ep->regs->ep_stat);
571 if ((tmp & (1 << NAK_OUT_PACKETS)))
572 cleanup = 1;
573 else if ((tmp & (1 << FIFO_FULL))) {
574 start_out_naking (ep);
575 prevent = 1;
576 }
577 /* else: hope we don't see the problem */
578 }
579
580 /* never overflow the rx buffer. the fifo reads packets until
581 * it sees a short one; we might not be ready for them all.
582 */
583 prefetchw (buf);
584 count = readl (®s->ep_avail);
585 if (unlikely (count == 0)) {
586 udelay (1);
587 tmp = readl (&ep->regs->ep_stat);
588 count = readl (®s->ep_avail);
589 /* handled that data already? */
590 if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0)
591 return 0;
592 }
593
594 tmp = req->req.length - req->req.actual;
595 if (count > tmp) {
596 /* as with DMA, data overflow gets flushed */
597 if ((tmp % ep->ep.maxpacket) != 0) {
598 ERROR (ep->dev,
599 "%s out fifo %d bytes, expected %d\n",
600 ep->ep.name, count, tmp);
601 req->req.status = -EOVERFLOW;
602 cleanup = 1;
603 /* NAK_OUT_PACKETS will be set, so flushing is safe;
604 * the next read will start with the next packet
605 */
606 } /* else it's a ZLP, no worries */
607 count = tmp;
608 }
609 req->req.actual += count;
610
611 is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
612
613 VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
614 ep->ep.name, count, is_short ? " (short)" : "",
615 cleanup ? " flush" : "", prevent ? " nak" : "",
616 req, req->req.actual, req->req.length);
617
618 while (count >= 4) {
619 tmp = readl (®s->ep_data);
620 cpu_to_le32s (&tmp);
621 put_unaligned (tmp, (u32 *)buf);
622 buf += 4;
623 count -= 4;
624 }
625 if (count) {
626 tmp = readl (®s->ep_data);
627 /* LE conversion is implicit here: */
628 do {
629 *buf++ = (u8) tmp;
630 tmp >>= 8;
631 } while (--count);
632 }
633 if (cleanup)
634 out_flush (ep);
635 if (prevent) {
636 writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
637 (void) readl (&ep->regs->ep_rsp);
638 }
639
640 return is_short || ((req->req.actual == req->req.length)
641 && !req->req.zero);
642}
643
644/* fill out dma descriptor to match a given request */
645static void
646fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid)
647{
648 struct net2280_dma *td = req->td;
649 u32 dmacount = req->req.length;
650
651 /* don't let DMA continue after a short OUT packet,
652 * so overruns can't affect the next transfer.
653 * in case of overruns on max-size packets, we can't
654 * stop the fifo from filling but we can flush it.
655 */
656 if (ep->is_in)
657 dmacount |= (1 << DMA_DIRECTION);
658 if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0)
659 || ep->dev->pdev->device != 0x2280)
660 dmacount |= (1 << END_OF_CHAIN);
661
662 req->valid = valid;
663 if (valid)
664 dmacount |= (1 << VALID_BIT);
665 if (likely(!req->req.no_interrupt || !use_dma_chaining))
666 dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE);
667
668 /* td->dmadesc = previously set by caller */
669 td->dmaaddr = cpu_to_le32 (req->req.dma);
670
671 /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
672 wmb ();
673 td->dmacount = cpu_to_le32(dmacount);
674}
675
676static const u32 dmactl_default =
677 (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
678 | (1 << DMA_CLEAR_COUNT_ENABLE)
679 /* erratum 0116 workaround part 1 (use POLLING) */
680 | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE)
681 | (1 << DMA_VALID_BIT_POLLING_ENABLE)
682 | (1 << DMA_VALID_BIT_ENABLE)
683 | (1 << DMA_SCATTER_GATHER_ENABLE)
684 /* erratum 0116 workaround part 2 (no AUTOSTART) */
685 | (1 << DMA_ENABLE);
686
687static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma)
688{
689 handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50);
690}
691
692static inline void stop_dma (struct net2280_dma_regs __iomem *dma)
693{
694 writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl);
695 spin_stop_dma (dma);
696}
697
698static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma)
699{
700 struct net2280_dma_regs __iomem *dma = ep->dma;
701 unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION);
702
703 if (ep->dev->pdev->device != 0x2280)
704 tmp |= (1 << END_OF_CHAIN);
705
706 writel (tmp, &dma->dmacount);
707 writel (readl (&dma->dmastat), &dma->dmastat);
708
709 writel (td_dma, &dma->dmadesc);
710 writel (dmactl, &dma->dmactl);
711
712 /* erratum 0116 workaround part 3: pci arbiter away from net2280 */
713 (void) readl (&ep->dev->pci->pcimstctl);
714
715 writel ((1 << DMA_START), &dma->dmastat);
716
717 if (!ep->is_in)
718 stop_out_naking (ep);
719}
720
721static void start_dma (struct net2280_ep *ep, struct net2280_request *req)
722{
723 u32 tmp;
724 struct net2280_dma_regs __iomem *dma = ep->dma;
725
726 /* FIXME can't use DMA for ZLPs */
727
728 /* on this path we "know" there's no dma active (yet) */
729 WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE));
730 writel (0, &ep->dma->dmactl);
731
732 /* previous OUT packet might have been short */
733 if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat))
734 & (1 << NAK_OUT_PACKETS)) != 0) {
735 writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT),
736 &ep->regs->ep_stat);
737
738 tmp = readl (&ep->regs->ep_avail);
739 if (tmp) {
740 writel (readl (&dma->dmastat), &dma->dmastat);
741
742 /* transfer all/some fifo data */
743 writel (req->req.dma, &dma->dmaaddr);
744 tmp = min (tmp, req->req.length);
745
746 /* dma irq, faking scatterlist status */
747 req->td->dmacount = cpu_to_le32 (req->req.length - tmp);
748 writel ((1 << DMA_DONE_INTERRUPT_ENABLE)
749 | tmp, &dma->dmacount);
750 req->td->dmadesc = 0;
751 req->valid = 1;
752
753 writel ((1 << DMA_ENABLE), &dma->dmactl);
754 writel ((1 << DMA_START), &dma->dmastat);
755 return;
756 }
757 }
758
759 tmp = dmactl_default;
760
761 /* force packet boundaries between dma requests, but prevent the
762 * controller from automagically writing a last "short" packet
763 * (zero length) unless the driver explicitly said to do that.
764 */
765 if (ep->is_in) {
766 if (likely ((req->req.length % ep->ep.maxpacket) != 0
767 || req->req.zero)) {
768 tmp |= (1 << DMA_FIFO_VALIDATE);
769 ep->in_fifo_validate = 1;
770 } else
771 ep->in_fifo_validate = 0;
772 }
773
774 /* init req->td, pointing to the current dummy */
775 req->td->dmadesc = cpu_to_le32 (ep->td_dma);
776 fill_dma_desc (ep, req, 1);
777
778 if (!use_dma_chaining)
779 req->td->dmacount |= cpu_to_le32 (1 << END_OF_CHAIN);
780
781 start_queue (ep, tmp, req->td_dma);
782}
783
784static inline void
785queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid)
786{
787 struct net2280_dma *end;
788 dma_addr_t tmp;
789
790 /* swap new dummy for old, link; fill and maybe activate */
791 end = ep->dummy;
792 ep->dummy = req->td;
793 req->td = end;
794
795 tmp = ep->td_dma;
796 ep->td_dma = req->td_dma;
797 req->td_dma = tmp;
798
799 end->dmadesc = cpu_to_le32 (ep->td_dma);
800
801 fill_dma_desc (ep, req, valid);
802}
803
804static void
805done (struct net2280_ep *ep, struct net2280_request *req, int status)
806{
807 struct net2280 *dev;
808 unsigned stopped = ep->stopped;
809
810 list_del_init (&req->queue);
811
812 if (req->req.status == -EINPROGRESS)
813 req->req.status = status;
814 else
815 status = req->req.status;
816
817 dev = ep->dev;
818 if (req->mapped) {
819 pci_unmap_single (dev->pdev, req->req.dma, req->req.length,
820 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
821 req->req.dma = DMA_ADDR_INVALID;
822 req->mapped = 0;
823 }
824
825 if (status && status != -ESHUTDOWN)
826 VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n",
827 ep->ep.name, &req->req, status,
828 req->req.actual, req->req.length);
829
830 /* don't modify queue heads during completion callback */
831 ep->stopped = 1;
832 spin_unlock (&dev->lock);
833 req->req.complete (&ep->ep, &req->req);
834 spin_lock (&dev->lock);
835 ep->stopped = stopped;
836}
837
838/*-------------------------------------------------------------------------*/
839
840static int
841net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
842{
843 struct net2280_request *req;
844 struct net2280_ep *ep;
845 struct net2280 *dev;
846 unsigned long flags;
847
848 /* we always require a cpu-view buffer, so that we can
849 * always use pio (as fallback or whatever).
850 */
851 req = container_of (_req, struct net2280_request, req);
852 if (!_req || !_req->complete || !_req->buf
853 || !list_empty (&req->queue))
854 return -EINVAL;
855 if (_req->length > (~0 & DMA_BYTE_COUNT_MASK))
856 return -EDOM;
857 ep = container_of (_ep, struct net2280_ep, ep);
858 if (!_ep || (!ep->desc && ep->num != 0))
859 return -EINVAL;
860 dev = ep->dev;
861 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
862 return -ESHUTDOWN;
863
864 /* FIXME implement PIO fallback for ZLPs with DMA */
865 if (ep->dma && _req->length == 0)
866 return -EOPNOTSUPP;
867
868 /* set up dma mapping in case the caller didn't */
869 if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
870 _req->dma = pci_map_single (dev->pdev, _req->buf, _req->length,
871 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
872 req->mapped = 1;
873 }
874
875#if 0
876 VDEBUG (dev, "%s queue req %p, len %d buf %p\n",
877 _ep->name, _req, _req->length, _req->buf);
878#endif
879
880 spin_lock_irqsave (&dev->lock, flags);
881
882 _req->status = -EINPROGRESS;
883 _req->actual = 0;
884
885 /* kickstart this i/o queue? */
886 if (list_empty (&ep->queue) && !ep->stopped) {
887 /* use DMA if the endpoint supports it, else pio */
888 if (ep->dma)
889 start_dma (ep, req);
890 else {
891 /* maybe there's no control data, just status ack */
892 if (ep->num == 0 && _req->length == 0) {
893 allow_status (ep);
894 done (ep, req, 0);
895 VDEBUG (dev, "%s status ack\n", ep->ep.name);
896 goto done;
897 }
898
899 /* PIO ... stuff the fifo, or unblock it. */
900 if (ep->is_in)
901 write_fifo (ep, _req);
902 else if (list_empty (&ep->queue)) {
903 u32 s;
904
905 /* OUT FIFO might have packet(s) buffered */
906 s = readl (&ep->regs->ep_stat);
907 if ((s & (1 << FIFO_EMPTY)) == 0) {
908 /* note: _req->short_not_ok is
909 * ignored here since PIO _always_
910 * stops queue advance here, and
911 * _req->status doesn't change for
912 * short reads (only _req->actual)
913 */
914 if (read_fifo (ep, req)) {
915 done (ep, req, 0);
916 if (ep->num == 0)
917 allow_status (ep);
918 /* don't queue it */
919 req = NULL;
920 } else
921 s = readl (&ep->regs->ep_stat);
922 }
923
924 /* don't NAK, let the fifo fill */
925 if (req && (s & (1 << NAK_OUT_PACKETS)))
926 writel ((1 << CLEAR_NAK_OUT_PACKETS),
927 &ep->regs->ep_rsp);
928 }
929 }
930
931 } else if (ep->dma) {
932 int valid = 1;
933
934 if (ep->is_in) {
935 int expect;
936
937 /* preventing magic zlps is per-engine state, not
938 * per-transfer; irq logic must recover hiccups.
939 */
940 expect = likely (req->req.zero
941 || (req->req.length % ep->ep.maxpacket) != 0);
942 if (expect != ep->in_fifo_validate)
943 valid = 0;
944 }
945 queue_dma (ep, req, valid);
946
947 } /* else the irq handler advances the queue. */
948
949 ep->responded = 1;
950 if (req)
951 list_add_tail (&req->queue, &ep->queue);
952done:
953 spin_unlock_irqrestore (&dev->lock, flags);
954
955 /* pci writes may still be posted */
956 return 0;
957}
958
959static inline void
960dma_done (
961 struct net2280_ep *ep,
962 struct net2280_request *req,
963 u32 dmacount,
964 int status
965)
966{
967 req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
968 done (ep, req, status);
969}
970
971static void restart_dma (struct net2280_ep *ep);
972
973static void scan_dma_completions (struct net2280_ep *ep)
974{
975 /* only look at descriptors that were "naturally" retired,
976 * so fifo and list head state won't matter
977 */
978 while (!list_empty (&ep->queue)) {
979 struct net2280_request *req;
980 u32 tmp;
981
982 req = list_entry (ep->queue.next,
983 struct net2280_request, queue);
984 if (!req->valid)
985 break;
986 rmb ();
987 tmp = le32_to_cpup (&req->td->dmacount);
988 if ((tmp & (1 << VALID_BIT)) != 0)
989 break;
990
991 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
992 * cases where DMA must be aborted; this code handles
993 * all non-abort DMA completions.
994 */
995 if (unlikely (req->td->dmadesc == 0)) {
996 /* paranoia */
997 tmp = readl (&ep->dma->dmacount);
998 if (tmp & DMA_BYTE_COUNT_MASK)
999 break;
1000 /* single transfer mode */
1001 dma_done (ep, req, tmp, 0);
1002 break;
1003 } else if (!ep->is_in
1004 && (req->req.length % ep->ep.maxpacket) != 0) {
1005 tmp = readl (&ep->regs->ep_stat);
1006
1007 /* AVOID TROUBLE HERE by not issuing short reads from
1008 * your gadget driver. That helps avoids errata 0121,
1009 * 0122, and 0124; not all cases trigger the warning.
1010 */
1011 if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
1012 WARNING (ep->dev, "%s lost packet sync!\n",
1013 ep->ep.name);
1014 req->req.status = -EOVERFLOW;
1015 } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) {
1016 /* fifo gets flushed later */
1017 ep->out_overflow = 1;
1018 DEBUG (ep->dev, "%s dma, discard %d len %d\n",
1019 ep->ep.name, tmp,
1020 req->req.length);
1021 req->req.status = -EOVERFLOW;
1022 }
1023 }
1024 dma_done (ep, req, tmp, 0);
1025 }
1026}
1027
1028static void restart_dma (struct net2280_ep *ep)
1029{
1030 struct net2280_request *req;
1031 u32 dmactl = dmactl_default;
1032
1033 if (ep->stopped)
1034 return;
1035 req = list_entry (ep->queue.next, struct net2280_request, queue);
1036
1037 if (!use_dma_chaining) {
1038 start_dma (ep, req);
1039 return;
1040 }
1041
1042 /* the 2280 will be processing the queue unless queue hiccups after
1043 * the previous transfer:
1044 * IN: wanted automagic zlp, head doesn't (or vice versa)
1045 * DMA_FIFO_VALIDATE doesn't init from dma descriptors.
1046 * OUT: was "usb-short", we must restart.
1047 */
1048 if (ep->is_in && !req->valid) {
1049 struct net2280_request *entry, *prev = NULL;
1050 int reqmode, done = 0;
1051
1052 DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td);
1053 ep->in_fifo_validate = likely (req->req.zero
1054 || (req->req.length % ep->ep.maxpacket) != 0);
1055 if (ep->in_fifo_validate)
1056 dmactl |= (1 << DMA_FIFO_VALIDATE);
1057 list_for_each_entry (entry, &ep->queue, queue) {
1058 __le32 dmacount;
1059
1060 if (entry == req)
1061 continue;
1062 dmacount = entry->td->dmacount;
1063 if (!done) {
1064 reqmode = likely (entry->req.zero
1065 || (entry->req.length
1066 % ep->ep.maxpacket) != 0);
1067 if (reqmode == ep->in_fifo_validate) {
1068 entry->valid = 1;
1069 dmacount |= valid_bit;
1070 entry->td->dmacount = dmacount;
1071 prev = entry;
1072 continue;
1073 } else {
1074 /* force a hiccup */
1075 prev->td->dmacount |= dma_done_ie;
1076 done = 1;
1077 }
1078 }
1079
1080 /* walk the rest of the queue so unlinks behave */
1081 entry->valid = 0;
1082 dmacount &= ~valid_bit;
1083 entry->td->dmacount = dmacount;
1084 prev = entry;
1085 }
1086 }
1087
1088 writel (0, &ep->dma->dmactl);
1089 start_queue (ep, dmactl, req->td_dma);
1090}
1091
1092static void abort_dma (struct net2280_ep *ep)
1093{
1094 /* abort the current transfer */
1095 if (likely (!list_empty (&ep->queue))) {
1096 /* FIXME work around errata 0121, 0122, 0124 */
1097 writel ((1 << DMA_ABORT), &ep->dma->dmastat);
1098 spin_stop_dma (ep->dma);
1099 } else
1100 stop_dma (ep->dma);
1101 scan_dma_completions (ep);
1102}
1103
1104/* dequeue ALL requests */
1105static void nuke (struct net2280_ep *ep)
1106{
1107 struct net2280_request *req;
1108
1109 /* called with spinlock held */
1110 ep->stopped = 1;
1111 if (ep->dma)
1112 abort_dma (ep);
1113 while (!list_empty (&ep->queue)) {
1114 req = list_entry (ep->queue.next,
1115 struct net2280_request,
1116 queue);
1117 done (ep, req, -ESHUTDOWN);
1118 }
1119}
1120
1121/* dequeue JUST ONE request */
1122static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req)
1123{
1124 struct net2280_ep *ep;
1125 struct net2280_request *req;
1126 unsigned long flags;
1127 u32 dmactl;
1128 int stopped;
1129
1130 ep = container_of (_ep, struct net2280_ep, ep);
1131 if (!_ep || (!ep->desc && ep->num != 0) || !_req)
1132 return -EINVAL;
1133
1134 spin_lock_irqsave (&ep->dev->lock, flags);
1135 stopped = ep->stopped;
1136
1137 /* quiesce dma while we patch the queue */
1138 dmactl = 0;
1139 ep->stopped = 1;
1140 if (ep->dma) {
1141 dmactl = readl (&ep->dma->dmactl);
1142 /* WARNING erratum 0127 may kick in ... */
1143 stop_dma (ep->dma);
1144 scan_dma_completions (ep);
1145 }
1146
1147 /* make sure it's still queued on this endpoint */
1148 list_for_each_entry (req, &ep->queue, queue) {
1149 if (&req->req == _req)
1150 break;
1151 }
1152 if (&req->req != _req) {
1153 spin_unlock_irqrestore (&ep->dev->lock, flags);
1154 return -EINVAL;
1155 }
1156
1157 /* queue head may be partially complete. */
1158 if (ep->queue.next == &req->queue) {
1159 if (ep->dma) {
1160 DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name);
1161 _req->status = -ECONNRESET;
1162 abort_dma (ep);
1163 if (likely (ep->queue.next == &req->queue)) {
1164 // NOTE: misreports single-transfer mode
1165 req->td->dmacount = 0; /* invalidate */
1166 dma_done (ep, req,
1167 readl (&ep->dma->dmacount),
1168 -ECONNRESET);
1169 }
1170 } else {
1171 DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name);
1172 done (ep, req, -ECONNRESET);
1173 }
1174 req = NULL;
1175
1176 /* patch up hardware chaining data */
1177 } else if (ep->dma && use_dma_chaining) {
1178 if (req->queue.prev == ep->queue.next) {
1179 writel (le32_to_cpu (req->td->dmadesc),
1180 &ep->dma->dmadesc);
1181 if (req->td->dmacount & dma_done_ie)
1182 writel (readl (&ep->dma->dmacount)
1183 | le32_to_cpu(dma_done_ie),
1184 &ep->dma->dmacount);
1185 } else {
1186 struct net2280_request *prev;
1187
1188 prev = list_entry (req->queue.prev,
1189 struct net2280_request, queue);
1190 prev->td->dmadesc = req->td->dmadesc;
1191 if (req->td->dmacount & dma_done_ie)
1192 prev->td->dmacount |= dma_done_ie;
1193 }
1194 }
1195
1196 if (req)
1197 done (ep, req, -ECONNRESET);
1198 ep->stopped = stopped;
1199
1200 if (ep->dma) {
1201 /* turn off dma on inactive queues */
1202 if (list_empty (&ep->queue))
1203 stop_dma (ep->dma);
1204 else if (!ep->stopped) {
1205 /* resume current request, or start new one */
1206 if (req)
1207 writel (dmactl, &ep->dma->dmactl);
1208 else
1209 start_dma (ep, list_entry (ep->queue.next,
1210 struct net2280_request, queue));
1211 }
1212 }
1213
1214 spin_unlock_irqrestore (&ep->dev->lock, flags);
1215 return 0;
1216}
1217
1218/*-------------------------------------------------------------------------*/
1219
1220static int net2280_fifo_status (struct usb_ep *_ep);
1221
1222static int
1223net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1224{
1225 struct net2280_ep *ep;
1226 unsigned long flags;
1227 int retval = 0;
1228
1229 ep = container_of (_ep, struct net2280_ep, ep);
1230 if (!_ep || (!ep->desc && ep->num != 0))
1231 return -EINVAL;
1232 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1233 return -ESHUTDOWN;
1234 if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1235 == USB_ENDPOINT_XFER_ISOC)
1236 return -EINVAL;
1237
1238 spin_lock_irqsave (&ep->dev->lock, flags);
1239 if (!list_empty (&ep->queue))
1240 retval = -EAGAIN;
1241 else if (ep->is_in && value && net2280_fifo_status (_ep) != 0)
1242 retval = -EAGAIN;
1243 else {
1244 VDEBUG (ep->dev, "%s %s %s\n", _ep->name,
1245 value ? "set" : "clear",
1246 wedged ? "wedge" : "halt");
1247 /* set/clear, then synch memory views with the device */
1248 if (value) {
1249 if (ep->num == 0)
1250 ep->dev->protocol_stall = 1;
1251 else
1252 set_halt (ep);
1253 if (wedged)
1254 ep->wedged = 1;
1255 } else {
1256 clear_halt (ep);
1257 ep->wedged = 0;
1258 }
1259 (void) readl (&ep->regs->ep_rsp);
1260 }
1261 spin_unlock_irqrestore (&ep->dev->lock, flags);
1262
1263 return retval;
1264}
1265
1266static int
1267net2280_set_halt(struct usb_ep *_ep, int value)
1268{
1269 return net2280_set_halt_and_wedge(_ep, value, 0);
1270}
1271
1272static int
1273net2280_set_wedge(struct usb_ep *_ep)
1274{
1275 if (!_ep || _ep->name == ep0name)
1276 return -EINVAL;
1277 return net2280_set_halt_and_wedge(_ep, 1, 1);
1278}
1279
1280static int
1281net2280_fifo_status (struct usb_ep *_ep)
1282{
1283 struct net2280_ep *ep;
1284 u32 avail;
1285
1286 ep = container_of (_ep, struct net2280_ep, ep);
1287 if (!_ep || (!ep->desc && ep->num != 0))
1288 return -ENODEV;
1289 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1290 return -ESHUTDOWN;
1291
1292 avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1);
1293 if (avail > ep->fifo_size)
1294 return -EOVERFLOW;
1295 if (ep->is_in)
1296 avail = ep->fifo_size - avail;
1297 return avail;
1298}
1299
1300static void
1301net2280_fifo_flush (struct usb_ep *_ep)
1302{
1303 struct net2280_ep *ep;
1304
1305 ep = container_of (_ep, struct net2280_ep, ep);
1306 if (!_ep || (!ep->desc && ep->num != 0))
1307 return;
1308 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1309 return;
1310
1311 writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
1312 (void) readl (&ep->regs->ep_rsp);
1313}
1314
1315static const struct usb_ep_ops net2280_ep_ops = {
1316 .enable = net2280_enable,
1317 .disable = net2280_disable,
1318
1319 .alloc_request = net2280_alloc_request,
1320 .free_request = net2280_free_request,
1321
1322 .queue = net2280_queue,
1323 .dequeue = net2280_dequeue,
1324
1325 .set_halt = net2280_set_halt,
1326 .set_wedge = net2280_set_wedge,
1327 .fifo_status = net2280_fifo_status,
1328 .fifo_flush = net2280_fifo_flush,
1329};
1330
1331/*-------------------------------------------------------------------------*/
1332
1333static int net2280_get_frame (struct usb_gadget *_gadget)
1334{
1335 struct net2280 *dev;
1336 unsigned long flags;
1337 u16 retval;
1338
1339 if (!_gadget)
1340 return -ENODEV;
1341 dev = container_of (_gadget, struct net2280, gadget);
1342 spin_lock_irqsave (&dev->lock, flags);
1343 retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff;
1344 spin_unlock_irqrestore (&dev->lock, flags);
1345 return retval;
1346}
1347
1348static int net2280_wakeup (struct usb_gadget *_gadget)
1349{
1350 struct net2280 *dev;
1351 u32 tmp;
1352 unsigned long flags;
1353
1354 if (!_gadget)
1355 return 0;
1356 dev = container_of (_gadget, struct net2280, gadget);
1357
1358 spin_lock_irqsave (&dev->lock, flags);
1359 tmp = readl (&dev->usb->usbctl);
1360 if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE))
1361 writel (1 << GENERATE_RESUME, &dev->usb->usbstat);
1362 spin_unlock_irqrestore (&dev->lock, flags);
1363
1364 /* pci writes may still be posted */
1365 return 0;
1366}
1367
1368static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value)
1369{
1370 struct net2280 *dev;
1371 u32 tmp;
1372 unsigned long flags;
1373
1374 if (!_gadget)
1375 return 0;
1376 dev = container_of (_gadget, struct net2280, gadget);
1377
1378 spin_lock_irqsave (&dev->lock, flags);
1379 tmp = readl (&dev->usb->usbctl);
1380 if (value)
1381 tmp |= (1 << SELF_POWERED_STATUS);
1382 else
1383 tmp &= ~(1 << SELF_POWERED_STATUS);
1384 writel (tmp, &dev->usb->usbctl);
1385 spin_unlock_irqrestore (&dev->lock, flags);
1386
1387 return 0;
1388}
1389
1390static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1391{
1392 struct net2280 *dev;
1393 u32 tmp;
1394 unsigned long flags;
1395
1396 if (!_gadget)
1397 return -ENODEV;
1398 dev = container_of (_gadget, struct net2280, gadget);
1399
1400 spin_lock_irqsave (&dev->lock, flags);
1401 tmp = readl (&dev->usb->usbctl);
1402 dev->softconnect = (is_on != 0);
1403 if (is_on)
1404 tmp |= (1 << USB_DETECT_ENABLE);
1405 else
1406 tmp &= ~(1 << USB_DETECT_ENABLE);
1407 writel (tmp, &dev->usb->usbctl);
1408 spin_unlock_irqrestore (&dev->lock, flags);
1409
1410 return 0;
1411}
1412
1413static int net2280_start(struct usb_gadget_driver *driver,
1414 int (*bind)(struct usb_gadget *));
1415static int net2280_stop(struct usb_gadget_driver *driver);
1416
1417static const struct usb_gadget_ops net2280_ops = {
1418 .get_frame = net2280_get_frame,
1419 .wakeup = net2280_wakeup,
1420 .set_selfpowered = net2280_set_selfpowered,
1421 .pullup = net2280_pullup,
1422 .start = net2280_start,
1423 .stop = net2280_stop,
1424};
1425
1426/*-------------------------------------------------------------------------*/
1427
1428#ifdef CONFIG_USB_GADGET_DEBUG_FILES
1429
1430/* FIXME move these into procfs, and use seq_file.
1431 * Sysfs _still_ doesn't behave for arbitrarily sized files,
1432 * and also doesn't help products using this with 2.4 kernels.
1433 */
1434
1435/* "function" sysfs attribute */
1436static ssize_t
1437show_function (struct device *_dev, struct device_attribute *attr, char *buf)
1438{
1439 struct net2280 *dev = dev_get_drvdata (_dev);
1440
1441 if (!dev->driver
1442 || !dev->driver->function
1443 || strlen (dev->driver->function) > PAGE_SIZE)
1444 return 0;
1445 return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function);
1446}
1447static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
1448
1449static ssize_t net2280_show_registers(struct device *_dev,
1450 struct device_attribute *attr, char *buf)
1451{
1452 struct net2280 *dev;
1453 char *next;
1454 unsigned size, t;
1455 unsigned long flags;
1456 int i;
1457 u32 t1, t2;
1458 const char *s;
1459
1460 dev = dev_get_drvdata (_dev);
1461 next = buf;
1462 size = PAGE_SIZE;
1463 spin_lock_irqsave (&dev->lock, flags);
1464
1465 if (dev->driver)
1466 s = dev->driver->driver.name;
1467 else
1468 s = "(none)";
1469
1470 /* Main Control Registers */
1471 t = scnprintf (next, size, "%s version " DRIVER_VERSION
1472 ", chiprev %04x, dma %s\n\n"
1473 "devinit %03x fifoctl %08x gadget '%s'\n"
1474 "pci irqenb0 %02x irqenb1 %08x "
1475 "irqstat0 %04x irqstat1 %08x\n",
1476 driver_name, dev->chiprev,
1477 use_dma
1478 ? (use_dma_chaining ? "chaining" : "enabled")
1479 : "disabled",
1480 readl (&dev->regs->devinit),
1481 readl (&dev->regs->fifoctl),
1482 s,
1483 readl (&dev->regs->pciirqenb0),
1484 readl (&dev->regs->pciirqenb1),
1485 readl (&dev->regs->irqstat0),
1486 readl (&dev->regs->irqstat1));
1487 size -= t;
1488 next += t;
1489
1490 /* USB Control Registers */
1491 t1 = readl (&dev->usb->usbctl);
1492 t2 = readl (&dev->usb->usbstat);
1493 if (t1 & (1 << VBUS_PIN)) {
1494 if (t2 & (1 << HIGH_SPEED))
1495 s = "high speed";
1496 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1497 s = "powered";
1498 else
1499 s = "full speed";
1500 /* full speed bit (6) not working?? */
1501 } else
1502 s = "not attached";
1503 t = scnprintf (next, size,
1504 "stdrsp %08x usbctl %08x usbstat %08x "
1505 "addr 0x%02x (%s)\n",
1506 readl (&dev->usb->stdrsp), t1, t2,
1507 readl (&dev->usb->ouraddr), s);
1508 size -= t;
1509 next += t;
1510
1511 /* PCI Master Control Registers */
1512
1513 /* DMA Control Registers */
1514
1515 /* Configurable EP Control Registers */
1516 for (i = 0; i < 7; i++) {
1517 struct net2280_ep *ep;
1518
1519 ep = &dev->ep [i];
1520 if (i && !ep->desc)
1521 continue;
1522
1523 t1 = readl (&ep->regs->ep_cfg);
1524 t2 = readl (&ep->regs->ep_rsp) & 0xff;
1525 t = scnprintf (next, size,
1526 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1527 "irqenb %02x\n",
1528 ep->ep.name, t1, t2,
1529 (t2 & (1 << CLEAR_NAK_OUT_PACKETS))
1530 ? "NAK " : "",
1531 (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE))
1532 ? "hide " : "",
1533 (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR))
1534 ? "CRC " : "",
1535 (t2 & (1 << CLEAR_INTERRUPT_MODE))
1536 ? "interrupt " : "",
1537 (t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1538 ? "status " : "",
1539 (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE))
1540 ? "NAKmode " : "",
1541 (t2 & (1 << CLEAR_ENDPOINT_TOGGLE))
1542 ? "DATA1 " : "DATA0 ",
1543 (t2 & (1 << CLEAR_ENDPOINT_HALT))
1544 ? "HALT " : "",
1545 readl (&ep->regs->ep_irqenb));
1546 size -= t;
1547 next += t;
1548
1549 t = scnprintf (next, size,
1550 "\tstat %08x avail %04x "
1551 "(ep%d%s-%s)%s\n",
1552 readl (&ep->regs->ep_stat),
1553 readl (&ep->regs->ep_avail),
1554 t1 & 0x0f, DIR_STRING (t1),
1555 type_string (t1 >> 8),
1556 ep->stopped ? "*" : "");
1557 size -= t;
1558 next += t;
1559
1560 if (!ep->dma)
1561 continue;
1562
1563 t = scnprintf (next, size,
1564 " dma\tctl %08x stat %08x count %08x\n"
1565 "\taddr %08x desc %08x\n",
1566 readl (&ep->dma->dmactl),
1567 readl (&ep->dma->dmastat),
1568 readl (&ep->dma->dmacount),
1569 readl (&ep->dma->dmaaddr),
1570 readl (&ep->dma->dmadesc));
1571 size -= t;
1572 next += t;
1573
1574 }
1575
1576 /* Indexed Registers */
1577 // none yet
1578
1579 /* Statistics */
1580 t = scnprintf (next, size, "\nirqs: ");
1581 size -= t;
1582 next += t;
1583 for (i = 0; i < 7; i++) {
1584 struct net2280_ep *ep;
1585
1586 ep = &dev->ep [i];
1587 if (i && !ep->irqs)
1588 continue;
1589 t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs);
1590 size -= t;
1591 next += t;
1592
1593 }
1594 t = scnprintf (next, size, "\n");
1595 size -= t;
1596 next += t;
1597
1598 spin_unlock_irqrestore (&dev->lock, flags);
1599
1600 return PAGE_SIZE - size;
1601}
1602static DEVICE_ATTR(registers, S_IRUGO, net2280_show_registers, NULL);
1603
1604static ssize_t
1605show_queues (struct device *_dev, struct device_attribute *attr, char *buf)
1606{
1607 struct net2280 *dev;
1608 char *next;
1609 unsigned size;
1610 unsigned long flags;
1611 int i;
1612
1613 dev = dev_get_drvdata (_dev);
1614 next = buf;
1615 size = PAGE_SIZE;
1616 spin_lock_irqsave (&dev->lock, flags);
1617
1618 for (i = 0; i < 7; i++) {
1619 struct net2280_ep *ep = &dev->ep [i];
1620 struct net2280_request *req;
1621 int t;
1622
1623 if (i != 0) {
1624 const struct usb_endpoint_descriptor *d;
1625
1626 d = ep->desc;
1627 if (!d)
1628 continue;
1629 t = d->bEndpointAddress;
1630 t = scnprintf (next, size,
1631 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1632 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1633 (t & USB_DIR_IN) ? "in" : "out",
1634 ({ char *val;
1635 switch (d->bmAttributes & 0x03) {
1636 case USB_ENDPOINT_XFER_BULK:
1637 val = "bulk"; break;
1638 case USB_ENDPOINT_XFER_INT:
1639 val = "intr"; break;
1640 default:
1641 val = "iso"; break;
1642 }; val; }),
1643 le16_to_cpu (d->wMaxPacketSize) & 0x1fff,
1644 ep->dma ? "dma" : "pio", ep->fifo_size
1645 );
1646 } else /* ep0 should only have one transfer queued */
1647 t = scnprintf (next, size, "ep0 max 64 pio %s\n",
1648 ep->is_in ? "in" : "out");
1649 if (t <= 0 || t > size)
1650 goto done;
1651 size -= t;
1652 next += t;
1653
1654 if (list_empty (&ep->queue)) {
1655 t = scnprintf (next, size, "\t(nothing queued)\n");
1656 if (t <= 0 || t > size)
1657 goto done;
1658 size -= t;
1659 next += t;
1660 continue;
1661 }
1662 list_for_each_entry (req, &ep->queue, queue) {
1663 if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc))
1664 t = scnprintf (next, size,
1665 "\treq %p len %d/%d "
1666 "buf %p (dmacount %08x)\n",
1667 &req->req, req->req.actual,
1668 req->req.length, req->req.buf,
1669 readl (&ep->dma->dmacount));
1670 else
1671 t = scnprintf (next, size,
1672 "\treq %p len %d/%d buf %p\n",
1673 &req->req, req->req.actual,
1674 req->req.length, req->req.buf);
1675 if (t <= 0 || t > size)
1676 goto done;
1677 size -= t;
1678 next += t;
1679
1680 if (ep->dma) {
1681 struct net2280_dma *td;
1682
1683 td = req->td;
1684 t = scnprintf (next, size, "\t td %08x "
1685 " count %08x buf %08x desc %08x\n",
1686 (u32) req->td_dma,
1687 le32_to_cpu (td->dmacount),
1688 le32_to_cpu (td->dmaaddr),
1689 le32_to_cpu (td->dmadesc));
1690 if (t <= 0 || t > size)
1691 goto done;
1692 size -= t;
1693 next += t;
1694 }
1695 }
1696 }
1697
1698done:
1699 spin_unlock_irqrestore (&dev->lock, flags);
1700 return PAGE_SIZE - size;
1701}
1702static DEVICE_ATTR (queues, S_IRUGO, show_queues, NULL);
1703
1704
1705#else
1706
1707#define device_create_file(a,b) (0)
1708#define device_remove_file(a,b) do { } while (0)
1709
1710#endif
1711
1712/*-------------------------------------------------------------------------*/
1713
1714/* another driver-specific mode might be a request type doing dma
1715 * to/from another device fifo instead of to/from memory.
1716 */
1717
1718static void set_fifo_mode (struct net2280 *dev, int mode)
1719{
1720 /* keeping high bits preserves BAR2 */
1721 writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1722
1723 /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1724 INIT_LIST_HEAD (&dev->gadget.ep_list);
1725 list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list);
1726 list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list);
1727 switch (mode) {
1728 case 0:
1729 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1730 list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list);
1731 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024;
1732 break;
1733 case 1:
1734 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048;
1735 break;
1736 case 2:
1737 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1738 dev->ep [1].fifo_size = 2048;
1739 dev->ep [2].fifo_size = 1024;
1740 break;
1741 }
1742 /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1743 list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list);
1744 list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list);
1745}
1746
1747/* keeping it simple:
1748 * - one bus driver, initted first;
1749 * - one function driver, initted second
1750 *
1751 * most of the work to support multiple net2280 controllers would
1752 * be to associate this gadget driver (yes?) with all of them, or
1753 * perhaps to bind specific drivers to specific devices.
1754 */
1755
1756static struct net2280 *the_controller;
1757
1758static void usb_reset (struct net2280 *dev)
1759{
1760 u32 tmp;
1761
1762 dev->gadget.speed = USB_SPEED_UNKNOWN;
1763 (void) readl (&dev->usb->usbctl);
1764
1765 net2280_led_init (dev);
1766
1767 /* disable automatic responses, and irqs */
1768 writel (0, &dev->usb->stdrsp);
1769 writel (0, &dev->regs->pciirqenb0);
1770 writel (0, &dev->regs->pciirqenb1);
1771
1772 /* clear old dma and irq state */
1773 for (tmp = 0; tmp < 4; tmp++) {
1774 struct net2280_ep *ep = &dev->ep [tmp + 1];
1775
1776 if (ep->dma)
1777 abort_dma (ep);
1778 }
1779 writel (~0, &dev->regs->irqstat0),
1780 writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
1781
1782 /* reset, and enable pci */
1783 tmp = readl (&dev->regs->devinit)
1784 | (1 << PCI_ENABLE)
1785 | (1 << FIFO_SOFT_RESET)
1786 | (1 << USB_SOFT_RESET)
1787 | (1 << M8051_RESET);
1788 writel (tmp, &dev->regs->devinit);
1789
1790 /* standard fifo and endpoint allocations */
1791 set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0);
1792}
1793
1794static void usb_reinit (struct net2280 *dev)
1795{
1796 u32 tmp;
1797 int init_dma;
1798
1799 /* use_dma changes are ignored till next device re-init */
1800 init_dma = use_dma;
1801
1802 /* basic endpoint init */
1803 for (tmp = 0; tmp < 7; tmp++) {
1804 struct net2280_ep *ep = &dev->ep [tmp];
1805
1806 ep->ep.name = ep_name [tmp];
1807 ep->dev = dev;
1808 ep->num = tmp;
1809
1810 if (tmp > 0 && tmp <= 4) {
1811 ep->fifo_size = 1024;
1812 if (init_dma)
1813 ep->dma = &dev->dma [tmp - 1];
1814 } else
1815 ep->fifo_size = 64;
1816 ep->regs = &dev->epregs [tmp];
1817 ep_reset (dev->regs, ep);
1818 }
1819 dev->ep [0].ep.maxpacket = 64;
1820 dev->ep [5].ep.maxpacket = 64;
1821 dev->ep [6].ep.maxpacket = 64;
1822
1823 dev->gadget.ep0 = &dev->ep [0].ep;
1824 dev->ep [0].stopped = 0;
1825 INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1826
1827 /* we want to prevent lowlevel/insecure access from the USB host,
1828 * but erratum 0119 means this enable bit is ignored
1829 */
1830 for (tmp = 0; tmp < 5; tmp++)
1831 writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg);
1832}
1833
1834static void ep0_start (struct net2280 *dev)
1835{
1836 writel ( (1 << CLEAR_EP_HIDE_STATUS_PHASE)
1837 | (1 << CLEAR_NAK_OUT_PACKETS)
1838 | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
1839 , &dev->epregs [0].ep_rsp);
1840
1841 /*
1842 * hardware optionally handles a bunch of standard requests
1843 * that the API hides from drivers anyway. have it do so.
1844 * endpoint status/features are handled in software, to
1845 * help pass tests for some dubious behavior.
1846 */
1847 writel ( (1 << SET_TEST_MODE)
1848 | (1 << SET_ADDRESS)
1849 | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP)
1850 | (1 << GET_DEVICE_STATUS)
1851 | (1 << GET_INTERFACE_STATUS)
1852 , &dev->usb->stdrsp);
1853 writel ( (1 << USB_ROOT_PORT_WAKEUP_ENABLE)
1854 | (1 << SELF_POWERED_USB_DEVICE)
1855 | (1 << REMOTE_WAKEUP_SUPPORT)
1856 | (dev->softconnect << USB_DETECT_ENABLE)
1857 | (1 << SELF_POWERED_STATUS)
1858 , &dev->usb->usbctl);
1859
1860 /* enable irqs so we can see ep0 and general operation */
1861 writel ( (1 << SETUP_PACKET_INTERRUPT_ENABLE)
1862 | (1 << ENDPOINT_0_INTERRUPT_ENABLE)
1863 , &dev->regs->pciirqenb0);
1864 writel ( (1 << PCI_INTERRUPT_ENABLE)
1865 | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE)
1866 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE)
1867 | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE)
1868 | (1 << VBUS_INTERRUPT_ENABLE)
1869 | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE)
1870 | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE)
1871 , &dev->regs->pciirqenb1);
1872
1873 /* don't leave any writes posted */
1874 (void) readl (&dev->usb->usbctl);
1875}
1876
1877/* when a driver is successfully registered, it will receive
1878 * control requests including set_configuration(), which enables
1879 * non-control requests. then usb traffic follows until a
1880 * disconnect is reported. then a host may connect again, or
1881 * the driver might get unbound.
1882 */
1883static int net2280_start(struct usb_gadget_driver *driver,
1884 int (*bind)(struct usb_gadget *))
1885{
1886 struct net2280 *dev = the_controller;
1887 int retval;
1888 unsigned i;
1889
1890 /* insist on high speed support from the driver, since
1891 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
1892 * "must not be used in normal operation"
1893 */
1894 if (!driver
1895 || driver->speed != USB_SPEED_HIGH
1896 || !bind || !driver->setup)
1897 return -EINVAL;
1898 if (!dev)
1899 return -ENODEV;
1900 if (dev->driver)
1901 return -EBUSY;
1902
1903 for (i = 0; i < 7; i++)
1904 dev->ep [i].irqs = 0;
1905
1906 /* hook up the driver ... */
1907 dev->softconnect = 1;
1908 driver->driver.bus = NULL;
1909 dev->driver = driver;
1910 dev->gadget.dev.driver = &driver->driver;
1911 retval = bind(&dev->gadget);
1912 if (retval) {
1913 DEBUG (dev, "bind to driver %s --> %d\n",
1914 driver->driver.name, retval);
1915 dev->driver = NULL;
1916 dev->gadget.dev.driver = NULL;
1917 return retval;
1918 }
1919
1920 retval = device_create_file (&dev->pdev->dev, &dev_attr_function);
1921 if (retval) goto err_unbind;
1922 retval = device_create_file (&dev->pdev->dev, &dev_attr_queues);
1923 if (retval) goto err_func;
1924
1925 /* ... then enable host detection and ep0; and we're ready
1926 * for set_configuration as well as eventual disconnect.
1927 */
1928 net2280_led_active (dev, 1);
1929 ep0_start (dev);
1930
1931 DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n",
1932 driver->driver.name,
1933 readl (&dev->usb->usbctl),
1934 readl (&dev->usb->stdrsp));
1935
1936 /* pci writes may still be posted */
1937 return 0;
1938
1939err_func:
1940 device_remove_file (&dev->pdev->dev, &dev_attr_function);
1941err_unbind:
1942 driver->unbind (&dev->gadget);
1943 dev->gadget.dev.driver = NULL;
1944 dev->driver = NULL;
1945 return retval;
1946}
1947
1948static void
1949stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver)
1950{
1951 int i;
1952
1953 /* don't disconnect if it's not connected */
1954 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1955 driver = NULL;
1956
1957 /* stop hardware; prevent new request submissions;
1958 * and kill any outstanding requests.
1959 */
1960 usb_reset (dev);
1961 for (i = 0; i < 7; i++)
1962 nuke (&dev->ep [i]);
1963
1964 /* report disconnect; the driver is already quiesced */
1965 if (driver) {
1966 spin_unlock (&dev->lock);
1967 driver->disconnect (&dev->gadget);
1968 spin_lock (&dev->lock);
1969 }
1970
1971 usb_reinit (dev);
1972}
1973
1974static int net2280_stop(struct usb_gadget_driver *driver)
1975{
1976 struct net2280 *dev = the_controller;
1977 unsigned long flags;
1978
1979 if (!dev)
1980 return -ENODEV;
1981 if (!driver || driver != dev->driver || !driver->unbind)
1982 return -EINVAL;
1983
1984 spin_lock_irqsave (&dev->lock, flags);
1985 stop_activity (dev, driver);
1986 spin_unlock_irqrestore (&dev->lock, flags);
1987
1988 net2280_pullup (&dev->gadget, 0);
1989
1990 driver->unbind (&dev->gadget);
1991 dev->gadget.dev.driver = NULL;
1992 dev->driver = NULL;
1993
1994 net2280_led_active (dev, 0);
1995 device_remove_file (&dev->pdev->dev, &dev_attr_function);
1996 device_remove_file (&dev->pdev->dev, &dev_attr_queues);
1997
1998 DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name);
1999 return 0;
2000}
2001
2002/*-------------------------------------------------------------------------*/
2003
2004/* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2005 * also works for dma-capable endpoints, in pio mode or just
2006 * to manually advance the queue after short OUT transfers.
2007 */
2008static void handle_ep_small (struct net2280_ep *ep)
2009{
2010 struct net2280_request *req;
2011 u32 t;
2012 /* 0 error, 1 mid-data, 2 done */
2013 int mode = 1;
2014
2015 if (!list_empty (&ep->queue))
2016 req = list_entry (ep->queue.next,
2017 struct net2280_request, queue);
2018 else
2019 req = NULL;
2020
2021 /* ack all, and handle what we care about */
2022 t = readl (&ep->regs->ep_stat);
2023 ep->irqs++;
2024#if 0
2025 VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n",
2026 ep->ep.name, t, req ? &req->req : 0);
2027#endif
2028 if (!ep->is_in || ep->dev->pdev->device == 0x2280)
2029 writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat);
2030 else
2031 /* Added for 2282 */
2032 writel (t, &ep->regs->ep_stat);
2033
2034 /* for ep0, monitor token irqs to catch data stage length errors
2035 * and to synchronize on status.
2036 *
2037 * also, to defer reporting of protocol stalls ... here's where
2038 * data or status first appears, handling stalls here should never
2039 * cause trouble on the host side..
2040 *
2041 * control requests could be slightly faster without token synch for
2042 * status, but status can jam up that way.
2043 */
2044 if (unlikely (ep->num == 0)) {
2045 if (ep->is_in) {
2046 /* status; stop NAKing */
2047 if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) {
2048 if (ep->dev->protocol_stall) {
2049 ep->stopped = 1;
2050 set_halt (ep);
2051 }
2052 if (!req)
2053 allow_status (ep);
2054 mode = 2;
2055 /* reply to extra IN data tokens with a zlp */
2056 } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2057 if (ep->dev->protocol_stall) {
2058 ep->stopped = 1;
2059 set_halt (ep);
2060 mode = 2;
2061 } else if (ep->responded &&
2062 !req && !ep->stopped)
2063 write_fifo (ep, NULL);
2064 }
2065 } else {
2066 /* status; stop NAKing */
2067 if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2068 if (ep->dev->protocol_stall) {
2069 ep->stopped = 1;
2070 set_halt (ep);
2071 }
2072 mode = 2;
2073 /* an extra OUT token is an error */
2074 } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT))
2075 && req
2076 && req->req.actual == req->req.length)
2077 || (ep->responded && !req)) {
2078 ep->dev->protocol_stall = 1;
2079 set_halt (ep);
2080 ep->stopped = 1;
2081 if (req)
2082 done (ep, req, -EOVERFLOW);
2083 req = NULL;
2084 }
2085 }
2086 }
2087
2088 if (unlikely (!req))
2089 return;
2090
2091 /* manual DMA queue advance after short OUT */
2092 if (likely (ep->dma != 0)) {
2093 if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2094 u32 count;
2095 int stopped = ep->stopped;
2096
2097 /* TRANSFERRED works around OUT_DONE erratum 0112.
2098 * we expect (N <= maxpacket) bytes; host wrote M.
2099 * iff (M < N) we won't ever see a DMA interrupt.
2100 */
2101 ep->stopped = 1;
2102 for (count = 0; ; t = readl (&ep->regs->ep_stat)) {
2103
2104 /* any preceding dma transfers must finish.
2105 * dma handles (M >= N), may empty the queue
2106 */
2107 scan_dma_completions (ep);
2108 if (unlikely (list_empty (&ep->queue)
2109 || ep->out_overflow)) {
2110 req = NULL;
2111 break;
2112 }
2113 req = list_entry (ep->queue.next,
2114 struct net2280_request, queue);
2115
2116 /* here either (M < N), a "real" short rx;
2117 * or (M == N) and the queue didn't empty
2118 */
2119 if (likely (t & (1 << FIFO_EMPTY))) {
2120 count = readl (&ep->dma->dmacount);
2121 count &= DMA_BYTE_COUNT_MASK;
2122 if (readl (&ep->dma->dmadesc)
2123 != req->td_dma)
2124 req = NULL;
2125 break;
2126 }
2127 udelay(1);
2128 }
2129
2130 /* stop DMA, leave ep NAKing */
2131 writel ((1 << DMA_ABORT), &ep->dma->dmastat);
2132 spin_stop_dma (ep->dma);
2133
2134 if (likely (req)) {
2135 req->td->dmacount = 0;
2136 t = readl (&ep->regs->ep_avail);
2137 dma_done (ep, req, count,
2138 (ep->out_overflow || t)
2139 ? -EOVERFLOW : 0);
2140 }
2141
2142 /* also flush to prevent erratum 0106 trouble */
2143 if (unlikely (ep->out_overflow
2144 || (ep->dev->chiprev == 0x0100
2145 && ep->dev->gadget.speed
2146 == USB_SPEED_FULL))) {
2147 out_flush (ep);
2148 ep->out_overflow = 0;
2149 }
2150
2151 /* (re)start dma if needed, stop NAKing */
2152 ep->stopped = stopped;
2153 if (!list_empty (&ep->queue))
2154 restart_dma (ep);
2155 } else
2156 DEBUG (ep->dev, "%s dma ep_stat %08x ??\n",
2157 ep->ep.name, t);
2158 return;
2159
2160 /* data packet(s) received (in the fifo, OUT) */
2161 } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) {
2162 if (read_fifo (ep, req) && ep->num != 0)
2163 mode = 2;
2164
2165 /* data packet(s) transmitted (IN) */
2166 } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2167 unsigned len;
2168
2169 len = req->req.length - req->req.actual;
2170 if (len > ep->ep.maxpacket)
2171 len = ep->ep.maxpacket;
2172 req->req.actual += len;
2173
2174 /* if we wrote it all, we're usually done */
2175 if (req->req.actual == req->req.length) {
2176 if (ep->num == 0) {
2177 /* send zlps until the status stage */
2178 } else if (!req->req.zero || len != ep->ep.maxpacket)
2179 mode = 2;
2180 }
2181
2182 /* there was nothing to do ... */
2183 } else if (mode == 1)
2184 return;
2185
2186 /* done */
2187 if (mode == 2) {
2188 /* stream endpoints often resubmit/unlink in completion */
2189 done (ep, req, 0);
2190
2191 /* maybe advance queue to next request */
2192 if (ep->num == 0) {
2193 /* NOTE: net2280 could let gadget driver start the
2194 * status stage later. since not all controllers let
2195 * them control that, the api doesn't (yet) allow it.
2196 */
2197 if (!ep->stopped)
2198 allow_status (ep);
2199 req = NULL;
2200 } else {
2201 if (!list_empty (&ep->queue) && !ep->stopped)
2202 req = list_entry (ep->queue.next,
2203 struct net2280_request, queue);
2204 else
2205 req = NULL;
2206 if (req && !ep->is_in)
2207 stop_out_naking (ep);
2208 }
2209 }
2210
2211 /* is there a buffer for the next packet?
2212 * for best streaming performance, make sure there is one.
2213 */
2214 if (req && !ep->stopped) {
2215
2216 /* load IN fifo with next packet (may be zlp) */
2217 if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT))
2218 write_fifo (ep, &req->req);
2219 }
2220}
2221
2222static struct net2280_ep *
2223get_ep_by_addr (struct net2280 *dev, u16 wIndex)
2224{
2225 struct net2280_ep *ep;
2226
2227 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2228 return &dev->ep [0];
2229 list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) {
2230 u8 bEndpointAddress;
2231
2232 if (!ep->desc)
2233 continue;
2234 bEndpointAddress = ep->desc->bEndpointAddress;
2235 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2236 continue;
2237 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2238 return ep;
2239 }
2240 return NULL;
2241}
2242
2243static void handle_stat0_irqs (struct net2280 *dev, u32 stat)
2244{
2245 struct net2280_ep *ep;
2246 u32 num, scratch;
2247
2248 /* most of these don't need individual acks */
2249 stat &= ~(1 << INTA_ASSERTED);
2250 if (!stat)
2251 return;
2252 // DEBUG (dev, "irqstat0 %04x\n", stat);
2253
2254 /* starting a control request? */
2255 if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) {
2256 union {
2257 u32 raw [2];
2258 struct usb_ctrlrequest r;
2259 } u;
2260 int tmp;
2261 struct net2280_request *req;
2262
2263 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
2264 if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED))
2265 dev->gadget.speed = USB_SPEED_HIGH;
2266 else
2267 dev->gadget.speed = USB_SPEED_FULL;
2268 net2280_led_speed (dev, dev->gadget.speed);
2269 DEBUG (dev, "%s speed\n",
2270 (dev->gadget.speed == USB_SPEED_HIGH)
2271 ? "high" : "full");
2272 }
2273
2274 ep = &dev->ep [0];
2275 ep->irqs++;
2276
2277 /* make sure any leftover request state is cleared */
2278 stat &= ~(1 << ENDPOINT_0_INTERRUPT);
2279 while (!list_empty (&ep->queue)) {
2280 req = list_entry (ep->queue.next,
2281 struct net2280_request, queue);
2282 done (ep, req, (req->req.actual == req->req.length)
2283 ? 0 : -EPROTO);
2284 }
2285 ep->stopped = 0;
2286 dev->protocol_stall = 0;
2287
2288 if (ep->dev->pdev->device == 0x2280)
2289 tmp = (1 << FIFO_OVERFLOW)
2290 | (1 << FIFO_UNDERFLOW);
2291 else
2292 tmp = 0;
2293
2294 writel (tmp | (1 << TIMEOUT)
2295 | (1 << USB_STALL_SENT)
2296 | (1 << USB_IN_NAK_SENT)
2297 | (1 << USB_IN_ACK_RCVD)
2298 | (1 << USB_OUT_PING_NAK_SENT)
2299 | (1 << USB_OUT_ACK_SENT)
2300 | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
2301 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
2302 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2303 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2304 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2305 | (1 << DATA_IN_TOKEN_INTERRUPT)
2306 , &ep->regs->ep_stat);
2307 u.raw [0] = readl (&dev->usb->setup0123);
2308 u.raw [1] = readl (&dev->usb->setup4567);
2309
2310 cpu_to_le32s (&u.raw [0]);
2311 cpu_to_le32s (&u.raw [1]);
2312
2313 tmp = 0;
2314
2315#define w_value le16_to_cpu(u.r.wValue)
2316#define w_index le16_to_cpu(u.r.wIndex)
2317#define w_length le16_to_cpu(u.r.wLength)
2318
2319 /* ack the irq */
2320 writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0);
2321 stat ^= (1 << SETUP_PACKET_INTERRUPT);
2322
2323 /* watch control traffic at the token level, and force
2324 * synchronization before letting the status stage happen.
2325 * FIXME ignore tokens we'll NAK, until driver responds.
2326 * that'll mean a lot less irqs for some drivers.
2327 */
2328 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
2329 if (ep->is_in) {
2330 scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2331 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2332 | (1 << DATA_IN_TOKEN_INTERRUPT);
2333 stop_out_naking (ep);
2334 } else
2335 scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2336 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2337 | (1 << DATA_IN_TOKEN_INTERRUPT);
2338 writel (scratch, &dev->epregs [0].ep_irqenb);
2339
2340 /* we made the hardware handle most lowlevel requests;
2341 * everything else goes uplevel to the gadget code.
2342 */
2343 ep->responded = 1;
2344 switch (u.r.bRequest) {
2345 case USB_REQ_GET_STATUS: {
2346 struct net2280_ep *e;
2347 __le32 status;
2348
2349 /* hw handles device and interface status */
2350 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
2351 goto delegate;
2352 if ((e = get_ep_by_addr (dev, w_index)) == 0
2353 || w_length > 2)
2354 goto do_stall;
2355
2356 if (readl (&e->regs->ep_rsp)
2357 & (1 << SET_ENDPOINT_HALT))
2358 status = cpu_to_le32 (1);
2359 else
2360 status = cpu_to_le32 (0);
2361
2362 /* don't bother with a request object! */
2363 writel (0, &dev->epregs [0].ep_irqenb);
2364 set_fifo_bytecount (ep, w_length);
2365 writel ((__force u32)status, &dev->epregs [0].ep_data);
2366 allow_status (ep);
2367 VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status);
2368 goto next_endpoints;
2369 }
2370 break;
2371 case USB_REQ_CLEAR_FEATURE: {
2372 struct net2280_ep *e;
2373
2374 /* hw handles device features */
2375 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2376 goto delegate;
2377 if (w_value != USB_ENDPOINT_HALT
2378 || w_length != 0)
2379 goto do_stall;
2380 if ((e = get_ep_by_addr (dev, w_index)) == 0)
2381 goto do_stall;
2382 if (e->wedged) {
2383 VDEBUG(dev, "%s wedged, halt not cleared\n",
2384 ep->ep.name);
2385 } else {
2386 VDEBUG(dev, "%s clear halt\n", ep->ep.name);
2387 clear_halt(e);
2388 }
2389 allow_status (ep);
2390 goto next_endpoints;
2391 }
2392 break;
2393 case USB_REQ_SET_FEATURE: {
2394 struct net2280_ep *e;
2395
2396 /* hw handles device features */
2397 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2398 goto delegate;
2399 if (w_value != USB_ENDPOINT_HALT
2400 || w_length != 0)
2401 goto do_stall;
2402 if ((e = get_ep_by_addr (dev, w_index)) == 0)
2403 goto do_stall;
2404 if (e->ep.name == ep0name)
2405 goto do_stall;
2406 set_halt (e);
2407 allow_status (ep);
2408 VDEBUG (dev, "%s set halt\n", ep->ep.name);
2409 goto next_endpoints;
2410 }
2411 break;
2412 default:
2413delegate:
2414 VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x "
2415 "ep_cfg %08x\n",
2416 u.r.bRequestType, u.r.bRequest,
2417 w_value, w_index, w_length,
2418 readl (&ep->regs->ep_cfg));
2419 ep->responded = 0;
2420 spin_unlock (&dev->lock);
2421 tmp = dev->driver->setup (&dev->gadget, &u.r);
2422 spin_lock (&dev->lock);
2423 }
2424
2425 /* stall ep0 on error */
2426 if (tmp < 0) {
2427do_stall:
2428 VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n",
2429 u.r.bRequestType, u.r.bRequest, tmp);
2430 dev->protocol_stall = 1;
2431 }
2432
2433 /* some in/out token irq should follow; maybe stall then.
2434 * driver must queue a request (even zlp) or halt ep0
2435 * before the host times out.
2436 */
2437 }
2438
2439#undef w_value
2440#undef w_index
2441#undef w_length
2442
2443next_endpoints:
2444 /* endpoint data irq ? */
2445 scratch = stat & 0x7f;
2446 stat &= ~0x7f;
2447 for (num = 0; scratch; num++) {
2448 u32 t;
2449
2450 /* do this endpoint's FIFO and queue need tending? */
2451 t = 1 << num;
2452 if ((scratch & t) == 0)
2453 continue;
2454 scratch ^= t;
2455
2456 ep = &dev->ep [num];
2457 handle_ep_small (ep);
2458 }
2459
2460 if (stat)
2461 DEBUG (dev, "unhandled irqstat0 %08x\n", stat);
2462}
2463
2464#define DMA_INTERRUPTS ( \
2465 (1 << DMA_D_INTERRUPT) \
2466 | (1 << DMA_C_INTERRUPT) \
2467 | (1 << DMA_B_INTERRUPT) \
2468 | (1 << DMA_A_INTERRUPT))
2469#define PCI_ERROR_INTERRUPTS ( \
2470 (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \
2471 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \
2472 | (1 << PCI_RETRY_ABORT_INTERRUPT))
2473
2474static void handle_stat1_irqs (struct net2280 *dev, u32 stat)
2475{
2476 struct net2280_ep *ep;
2477 u32 tmp, num, mask, scratch;
2478
2479 /* after disconnect there's nothing else to do! */
2480 tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT);
2481 mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED);
2482
2483 /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
2484 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRRUPT set and
2485 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
2486 * only indicates a change in the reset state).
2487 */
2488 if (stat & tmp) {
2489 writel (tmp, &dev->regs->irqstat1);
2490 if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT))
2491 && ((readl (&dev->usb->usbstat) & mask)
2492 == 0))
2493 || ((readl (&dev->usb->usbctl)
2494 & (1 << VBUS_PIN)) == 0)
2495 ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) {
2496 DEBUG (dev, "disconnect %s\n",
2497 dev->driver->driver.name);
2498 stop_activity (dev, dev->driver);
2499 ep0_start (dev);
2500 return;
2501 }
2502 stat &= ~tmp;
2503
2504 /* vBUS can bounce ... one of many reasons to ignore the
2505 * notion of hotplug events on bus connect/disconnect!
2506 */
2507 if (!stat)
2508 return;
2509 }
2510
2511 /* NOTE: chip stays in PCI D0 state for now, but it could
2512 * enter D1 to save more power
2513 */
2514 tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT);
2515 if (stat & tmp) {
2516 writel (tmp, &dev->regs->irqstat1);
2517 if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) {
2518 if (dev->driver->suspend)
2519 dev->driver->suspend (&dev->gadget);
2520 if (!enable_suspend)
2521 stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT);
2522 } else {
2523 if (dev->driver->resume)
2524 dev->driver->resume (&dev->gadget);
2525 /* at high speed, note erratum 0133 */
2526 }
2527 stat &= ~tmp;
2528 }
2529
2530 /* clear any other status/irqs */
2531 if (stat)
2532 writel (stat, &dev->regs->irqstat1);
2533
2534 /* some status we can just ignore */
2535 if (dev->pdev->device == 0x2280)
2536 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2537 | (1 << SUSPEND_REQUEST_INTERRUPT)
2538 | (1 << RESUME_INTERRUPT)
2539 | (1 << SOF_INTERRUPT));
2540 else
2541 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2542 | (1 << RESUME_INTERRUPT)
2543 | (1 << SOF_DOWN_INTERRUPT)
2544 | (1 << SOF_INTERRUPT));
2545
2546 if (!stat)
2547 return;
2548 // DEBUG (dev, "irqstat1 %08x\n", stat);
2549
2550 /* DMA status, for ep-{a,b,c,d} */
2551 scratch = stat & DMA_INTERRUPTS;
2552 stat &= ~DMA_INTERRUPTS;
2553 scratch >>= 9;
2554 for (num = 0; scratch; num++) {
2555 struct net2280_dma_regs __iomem *dma;
2556
2557 tmp = 1 << num;
2558 if ((tmp & scratch) == 0)
2559 continue;
2560 scratch ^= tmp;
2561
2562 ep = &dev->ep [num + 1];
2563 dma = ep->dma;
2564
2565 if (!dma)
2566 continue;
2567
2568 /* clear ep's dma status */
2569 tmp = readl (&dma->dmastat);
2570 writel (tmp, &dma->dmastat);
2571
2572 /* chaining should stop on abort, short OUT from fifo,
2573 * or (stat0 codepath) short OUT transfer.
2574 */
2575 if (!use_dma_chaining) {
2576 if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT))
2577 == 0) {
2578 DEBUG (ep->dev, "%s no xact done? %08x\n",
2579 ep->ep.name, tmp);
2580 continue;
2581 }
2582 stop_dma (ep->dma);
2583 }
2584
2585 /* OUT transfers terminate when the data from the
2586 * host is in our memory. Process whatever's done.
2587 * On this path, we know transfer's last packet wasn't
2588 * less than req->length. NAK_OUT_PACKETS may be set,
2589 * or the FIFO may already be holding new packets.
2590 *
2591 * IN transfers can linger in the FIFO for a very
2592 * long time ... we ignore that for now, accounting
2593 * precisely (like PIO does) needs per-packet irqs
2594 */
2595 scan_dma_completions (ep);
2596
2597 /* disable dma on inactive queues; else maybe restart */
2598 if (list_empty (&ep->queue)) {
2599 if (use_dma_chaining)
2600 stop_dma (ep->dma);
2601 } else {
2602 tmp = readl (&dma->dmactl);
2603 if (!use_dma_chaining
2604 || (tmp & (1 << DMA_ENABLE)) == 0)
2605 restart_dma (ep);
2606 else if (ep->is_in && use_dma_chaining) {
2607 struct net2280_request *req;
2608 __le32 dmacount;
2609
2610 /* the descriptor at the head of the chain
2611 * may still have VALID_BIT clear; that's
2612 * used to trigger changing DMA_FIFO_VALIDATE
2613 * (affects automagic zlp writes).
2614 */
2615 req = list_entry (ep->queue.next,
2616 struct net2280_request, queue);
2617 dmacount = req->td->dmacount;
2618 dmacount &= cpu_to_le32 (
2619 (1 << VALID_BIT)
2620 | DMA_BYTE_COUNT_MASK);
2621 if (dmacount && (dmacount & valid_bit) == 0)
2622 restart_dma (ep);
2623 }
2624 }
2625 ep->irqs++;
2626 }
2627
2628 /* NOTE: there are other PCI errors we might usefully notice.
2629 * if they appear very often, here's where to try recovering.
2630 */
2631 if (stat & PCI_ERROR_INTERRUPTS) {
2632 ERROR (dev, "pci dma error; stat %08x\n", stat);
2633 stat &= ~PCI_ERROR_INTERRUPTS;
2634 /* these are fatal errors, but "maybe" they won't
2635 * happen again ...
2636 */
2637 stop_activity (dev, dev->driver);
2638 ep0_start (dev);
2639 stat = 0;
2640 }
2641
2642 if (stat)
2643 DEBUG (dev, "unhandled irqstat1 %08x\n", stat);
2644}
2645
2646static irqreturn_t net2280_irq (int irq, void *_dev)
2647{
2648 struct net2280 *dev = _dev;
2649
2650 /* shared interrupt, not ours */
2651 if (!(readl(&dev->regs->irqstat0) & (1 << INTA_ASSERTED)))
2652 return IRQ_NONE;
2653
2654 spin_lock (&dev->lock);
2655
2656 /* handle disconnect, dma, and more */
2657 handle_stat1_irqs (dev, readl (&dev->regs->irqstat1));
2658
2659 /* control requests and PIO */
2660 handle_stat0_irqs (dev, readl (&dev->regs->irqstat0));
2661
2662 spin_unlock (&dev->lock);
2663
2664 return IRQ_HANDLED;
2665}
2666
2667/*-------------------------------------------------------------------------*/
2668
2669static void gadget_release (struct device *_dev)
2670{
2671 struct net2280 *dev = dev_get_drvdata (_dev);
2672
2673 kfree (dev);
2674}
2675
2676/* tear down the binding between this driver and the pci device */
2677
2678static void net2280_remove (struct pci_dev *pdev)
2679{
2680 struct net2280 *dev = pci_get_drvdata (pdev);
2681
2682 usb_del_gadget_udc(&dev->gadget);
2683
2684 BUG_ON(dev->driver);
2685
2686 /* then clean up the resources we allocated during probe() */
2687 net2280_led_shutdown (dev);
2688 if (dev->requests) {
2689 int i;
2690 for (i = 1; i < 5; i++) {
2691 if (!dev->ep [i].dummy)
2692 continue;
2693 pci_pool_free (dev->requests, dev->ep [i].dummy,
2694 dev->ep [i].td_dma);
2695 }
2696 pci_pool_destroy (dev->requests);
2697 }
2698 if (dev->got_irq)
2699 free_irq (pdev->irq, dev);
2700 if (dev->regs)
2701 iounmap (dev->regs);
2702 if (dev->region)
2703 release_mem_region (pci_resource_start (pdev, 0),
2704 pci_resource_len (pdev, 0));
2705 if (dev->enabled)
2706 pci_disable_device (pdev);
2707 device_unregister (&dev->gadget.dev);
2708 device_remove_file (&pdev->dev, &dev_attr_registers);
2709 pci_set_drvdata (pdev, NULL);
2710
2711 INFO (dev, "unbind\n");
2712
2713 the_controller = NULL;
2714}
2715
2716/* wrap this driver around the specified device, but
2717 * don't respond over USB until a gadget driver binds to us.
2718 */
2719
2720static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id)
2721{
2722 struct net2280 *dev;
2723 unsigned long resource, len;
2724 void __iomem *base = NULL;
2725 int retval, i;
2726
2727 /* if you want to support more than one controller in a system,
2728 * usb_gadget_driver_{register,unregister}() must change.
2729 */
2730 if (the_controller) {
2731 dev_warn (&pdev->dev, "ignoring\n");
2732 return -EBUSY;
2733 }
2734
2735 /* alloc, and start init */
2736 dev = kzalloc (sizeof *dev, GFP_KERNEL);
2737 if (dev == NULL){
2738 retval = -ENOMEM;
2739 goto done;
2740 }
2741
2742 pci_set_drvdata (pdev, dev);
2743 spin_lock_init (&dev->lock);
2744 dev->pdev = pdev;
2745 dev->gadget.ops = &net2280_ops;
2746 dev->gadget.is_dualspeed = 1;
2747
2748 /* the "gadget" abstracts/virtualizes the controller */
2749 dev_set_name(&dev->gadget.dev, "gadget");
2750 dev->gadget.dev.parent = &pdev->dev;
2751 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2752 dev->gadget.dev.release = gadget_release;
2753 dev->gadget.name = driver_name;
2754
2755 /* now all the pci goodies ... */
2756 if (pci_enable_device (pdev) < 0) {
2757 retval = -ENODEV;
2758 goto done;
2759 }
2760 dev->enabled = 1;
2761
2762 /* BAR 0 holds all the registers
2763 * BAR 1 is 8051 memory; unused here (note erratum 0103)
2764 * BAR 2 is fifo memory; unused here
2765 */
2766 resource = pci_resource_start (pdev, 0);
2767 len = pci_resource_len (pdev, 0);
2768 if (!request_mem_region (resource, len, driver_name)) {
2769 DEBUG (dev, "controller already in use\n");
2770 retval = -EBUSY;
2771 goto done;
2772 }
2773 dev->region = 1;
2774
2775 /* FIXME provide firmware download interface to put
2776 * 8051 code into the chip, e.g. to turn on PCI PM.
2777 */
2778
2779 base = ioremap_nocache (resource, len);
2780 if (base == NULL) {
2781 DEBUG (dev, "can't map memory\n");
2782 retval = -EFAULT;
2783 goto done;
2784 }
2785 dev->regs = (struct net2280_regs __iomem *) base;
2786 dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
2787 dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
2788 dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
2789 dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
2790 dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
2791
2792 /* put into initial config, link up all endpoints */
2793 writel (0, &dev->usb->usbctl);
2794 usb_reset (dev);
2795 usb_reinit (dev);
2796
2797 /* irq setup after old hardware is cleaned up */
2798 if (!pdev->irq) {
2799 ERROR (dev, "No IRQ. Check PCI setup!\n");
2800 retval = -ENODEV;
2801 goto done;
2802 }
2803
2804 if (request_irq (pdev->irq, net2280_irq, IRQF_SHARED, driver_name, dev)
2805 != 0) {
2806 ERROR (dev, "request interrupt %d failed\n", pdev->irq);
2807 retval = -EBUSY;
2808 goto done;
2809 }
2810 dev->got_irq = 1;
2811
2812 /* DMA setup */
2813 /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */
2814 dev->requests = pci_pool_create ("requests", pdev,
2815 sizeof (struct net2280_dma),
2816 0 /* no alignment requirements */,
2817 0 /* or page-crossing issues */);
2818 if (!dev->requests) {
2819 DEBUG (dev, "can't get request pool\n");
2820 retval = -ENOMEM;
2821 goto done;
2822 }
2823 for (i = 1; i < 5; i++) {
2824 struct net2280_dma *td;
2825
2826 td = pci_pool_alloc (dev->requests, GFP_KERNEL,
2827 &dev->ep [i].td_dma);
2828 if (!td) {
2829 DEBUG (dev, "can't get dummy %d\n", i);
2830 retval = -ENOMEM;
2831 goto done;
2832 }
2833 td->dmacount = 0; /* not VALID */
2834 td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
2835 td->dmadesc = td->dmaaddr;
2836 dev->ep [i].dummy = td;
2837 }
2838
2839 /* enable lower-overhead pci memory bursts during DMA */
2840 writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE)
2841 // 256 write retries may not be enough...
2842 // | (1 << PCI_RETRY_ABORT_ENABLE)
2843 | (1 << DMA_READ_MULTIPLE_ENABLE)
2844 | (1 << DMA_READ_LINE_ENABLE)
2845 , &dev->pci->pcimstctl);
2846 /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
2847 pci_set_master (pdev);
2848 pci_try_set_mwi (pdev);
2849
2850 /* ... also flushes any posted pci writes */
2851 dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff;
2852
2853 /* done */
2854 INFO (dev, "%s\n", driver_desc);
2855 INFO (dev, "irq %d, pci mem %p, chip rev %04x\n",
2856 pdev->irq, base, dev->chiprev);
2857 INFO (dev, "version: " DRIVER_VERSION "; dma %s\n",
2858 use_dma
2859 ? (use_dma_chaining ? "chaining" : "enabled")
2860 : "disabled");
2861 the_controller = dev;
2862
2863 retval = device_register (&dev->gadget.dev);
2864 if (retval) goto done;
2865 retval = device_create_file (&pdev->dev, &dev_attr_registers);
2866 if (retval) goto done;
2867
2868 retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget);
2869 if (retval)
2870 goto done;
2871 return 0;
2872
2873done:
2874 if (dev)
2875 net2280_remove (pdev);
2876 return retval;
2877}
2878
2879/* make sure the board is quiescent; otherwise it will continue
2880 * generating IRQs across the upcoming reboot.
2881 */
2882
2883static void net2280_shutdown (struct pci_dev *pdev)
2884{
2885 struct net2280 *dev = pci_get_drvdata (pdev);
2886
2887 /* disable IRQs */
2888 writel (0, &dev->regs->pciirqenb0);
2889 writel (0, &dev->regs->pciirqenb1);
2890
2891 /* disable the pullup so the host will think we're gone */
2892 writel (0, &dev->usb->usbctl);
2893}
2894
2895
2896/*-------------------------------------------------------------------------*/
2897
2898static const struct pci_device_id pci_ids [] = { {
2899 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
2900 .class_mask = ~0,
2901 .vendor = 0x17cc,
2902 .device = 0x2280,
2903 .subvendor = PCI_ANY_ID,
2904 .subdevice = PCI_ANY_ID,
2905}, {
2906 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
2907 .class_mask = ~0,
2908 .vendor = 0x17cc,
2909 .device = 0x2282,
2910 .subvendor = PCI_ANY_ID,
2911 .subdevice = PCI_ANY_ID,
2912
2913}, { /* end: all zeroes */ }
2914};
2915MODULE_DEVICE_TABLE (pci, pci_ids);
2916
2917/* pci driver glue; this is a "new style" PCI driver module */
2918static struct pci_driver net2280_pci_driver = {
2919 .name = (char *) driver_name,
2920 .id_table = pci_ids,
2921
2922 .probe = net2280_probe,
2923 .remove = net2280_remove,
2924 .shutdown = net2280_shutdown,
2925
2926 /* FIXME add power management support */
2927};
2928
2929MODULE_DESCRIPTION (DRIVER_DESC);
2930MODULE_AUTHOR ("David Brownell");
2931MODULE_LICENSE ("GPL");
2932
2933static int __init init (void)
2934{
2935 if (!use_dma)
2936 use_dma_chaining = 0;
2937 return pci_register_driver (&net2280_pci_driver);
2938}
2939module_init (init);
2940
2941static void __exit cleanup (void)
2942{
2943 pci_unregister_driver (&net2280_pci_driver);
2944}
2945module_exit (cleanup);