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