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Merge remote-tracking branch 'regulator/topic/palmas' into v3.9-rc8
[mirror_ubuntu-hirsute-kernel.git] / drivers / usb / gadget / net2280.c
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1da177e4
LT		 1/*
2 * Driver for the PLX NET2280 USB device controller.
3 * Specs and errata are available from <http://www.plxtech.com>.
4 *
901b3d75 5 * PLX Technology Inc. (formerly NetChip Technology) supported the
1da177e4
LT		 6 * development of this driver.
7 *
8 *
9 * CODE STATUS HIGHLIGHTS
10 *
11 * This driver should work well with most "gadget" drivers, including
fa06920a 12 * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
1da177e4
LT		 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 *
901b3d75
DB		 29 * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
30 * with 2282 chip
950ee4c8 31 *
1da177e4
LT		 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.
1da177e4
LT		 36 */
37
38#undef DEBUG /* messages on error and most fault paths */
39#undef VERBOSE /* extra debug messages (success too) */
40
1da177e4
LT		 41#include <linux/module.h>
42#include <linux/pci.h>
682d4c80 43#include <linux/dma-mapping.h>
1da177e4
LT		 44#include <linux/kernel.h>
45#include <linux/delay.h>
46#include <linux/ioport.h>
1da177e4 47#include <linux/slab.h>
1da177e4
LT		 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>
5f848137 55#include <linux/usb/ch9.h>
9454a57a 56#include <linux/usb/gadget.h>
b38b03b3 57#include <linux/prefetch.h>
1da177e4
LT		 58
59#include <asm/byteorder.h>
60#include <asm/io.h>
61#include <asm/irq.h>
1da177e4
LT		 62#include <asm/unaligned.h>
63
64
950ee4c8
GL		 65#define DRIVER_DESC "PLX NET228x USB Peripheral Controller"
66#define DRIVER_VERSION "2005 Sept 27"
1da177e4
LT		 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
74static const char driver_name [] = "net2280";
75static const char driver_desc [] = DRIVER_DESC;
76
77static const char ep0name [] = "ep0";
901b3d75 78static const char *const ep_name [] = {
1da177e4
LT		 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 */
90ab5ee9
RR		 92static bool use_dma = 1;
93static bool use_dma_chaining = 0;
1da177e4
LT		 94
95/* "modprobe net2280 use_dma=n" etc */
96module_param (use_dma, bool, S_IRUGO);
97module_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 */
104static ushort fifo_mode = 0;
105
106/* "modprobe net2280 fifo_mode=1" etc */
107module_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,
25985edc 111 * USB suspend requests will be ignored. This is acceptable for
950ee4c8 112 * self-powered devices
1da177e4 113 */
90ab5ee9 114static bool enable_suspend = 0;
1da177e4
LT		 115
116/* "modprobe net2280 enable_suspend=1" etc */
117module_param (enable_suspend, bool, S_IRUGO);
118
2f076077
AS		 119/* force full-speed operation */
120static bool full_speed;
121module_param(full_speed, bool, 0444);
122MODULE_PARM_DESC(full_speed, "force full-speed mode -- for testing only!");
1da177e4
LT		 123
124#define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
125
126#if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG)
127static char *type_string (u8 bmAttributes)
128{
129 switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
130 case USB_ENDPOINT_XFER_BULK: return "bulk";
131 case USB_ENDPOINT_XFER_ISOC: return "iso";
132 case USB_ENDPOINT_XFER_INT: return "intr";
133 };
134 return "control";
135}
136#endif
137
138#include "net2280.h"
139
551509d2
HH		 140#define valid_bit cpu_to_le32 (1 << VALID_BIT)
141#define dma_done_ie cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE)
1da177e4
LT		 142
143/*-------------------------------------------------------------------------*/
144
145static int
146net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
147{
148 struct net2280 *dev;
149 struct net2280_ep *ep;
150 u32 max, tmp;
151 unsigned long flags;
152
153 ep = container_of (_ep, struct net2280_ep, ep);
154 if (!_ep || !desc || ep->desc || _ep->name == ep0name
155 || desc->bDescriptorType != USB_DT_ENDPOINT)
156 return -EINVAL;
157 dev = ep->dev;
158 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
159 return -ESHUTDOWN;
160
161 /* erratum 0119 workaround ties up an endpoint number */
162 if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE)
163 return -EDOM;
164
165 /* sanity check ep-e/ep-f since their fifos are small */
29cc8897 166 max = usb_endpoint_maxp (desc) & 0x1fff;
1da177e4
LT		 167 if (ep->num > 4 && max > 64)
168 return -ERANGE;
169
170 spin_lock_irqsave (&dev->lock, flags);
171 _ep->maxpacket = max & 0x7ff;
172 ep->desc = desc;
173
174 /* ep_reset() has already been called */
175 ep->stopped = 0;
8066134f 176 ep->wedged = 0;
1da177e4
LT		 177 ep->out_overflow = 0;
178
179 /* set speed-dependent max packet; may kick in high bandwidth */
180 set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max);
181
182 /* FIFO lines can't go to different packets. PIO is ok, so
183 * use it instead of troublesome (non-bulk) multi-packet DMA.
184 */
185 if (ep->dma && (max % 4) != 0 && use_dma_chaining) {
186 DEBUG (ep->dev, "%s, no dma for maxpacket %d\n",
187 ep->ep.name, ep->ep.maxpacket);
188 ep->dma = NULL;
189 }
190
191 /* set type, direction, address; reset fifo counters */
192 writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
193 tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
194 if (tmp == USB_ENDPOINT_XFER_INT) {
195 /* erratum 0105 workaround prevents hs NYET */
196 if (dev->chiprev == 0100
197 && dev->gadget.speed == USB_SPEED_HIGH
198 && !(desc->bEndpointAddress & USB_DIR_IN))
199 writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE),
200 &ep->regs->ep_rsp);
201 } else if (tmp == USB_ENDPOINT_XFER_BULK) {
202 /* catch some particularly blatant driver bugs */
203 if ((dev->gadget.speed == USB_SPEED_HIGH
204 && max != 512)
205 || (dev->gadget.speed == USB_SPEED_FULL
206 && max > 64)) {
207 spin_unlock_irqrestore (&dev->lock, flags);
208 return -ERANGE;
209 }
210 }
211 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0;
212 tmp <<= ENDPOINT_TYPE;
213 tmp |= desc->bEndpointAddress;
214 tmp |= (4 << ENDPOINT_BYTE_COUNT); /* default full fifo lines */
215 tmp |= 1 << ENDPOINT_ENABLE;
216 wmb ();
217
218 /* for OUT transfers, block the rx fifo until a read is posted */
219 ep->is_in = (tmp & USB_DIR_IN) != 0;
220 if (!ep->is_in)
221 writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
950ee4c8 222 else if (dev->pdev->device != 0x2280) {
901b3d75
DB		 223 /* Added for 2282, Don't use nak packets on an in endpoint,
224 * this was ignored on 2280
225 */
950ee4c8
GL		 226 writel ((1 << CLEAR_NAK_OUT_PACKETS)
227 | (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
228 }
1da177e4
LT		 229
230 writel (tmp, &ep->regs->ep_cfg);
231
232 /* enable irqs */
233 if (!ep->dma) { /* pio, per-packet */
234 tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
235 writel (tmp, &dev->regs->pciirqenb0);
236
237 tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
950ee4c8
GL		 238 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
239 if (dev->pdev->device == 0x2280)
240 tmp |= readl (&ep->regs->ep_irqenb);
1da177e4
LT		 241 writel (tmp, &ep->regs->ep_irqenb);
242 } else { /* dma, per-request */
243 tmp = (1 << (8 + ep->num)); /* completion */
244 tmp |= readl (&dev->regs->pciirqenb1);
245 writel (tmp, &dev->regs->pciirqenb1);
246
247 /* for short OUT transfers, dma completions can't
248 * advance the queue; do it pio-style, by hand.
249 * NOTE erratum 0112 workaround #2
250 */
251 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
252 tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
253 writel (tmp, &ep->regs->ep_irqenb);
254
255 tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
256 writel (tmp, &dev->regs->pciirqenb0);
257 }
258 }
259
260 tmp = desc->bEndpointAddress;
261 DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
262 _ep->name, tmp & 0x0f, DIR_STRING (tmp),
263 type_string (desc->bmAttributes),
264 ep->dma ? "dma" : "pio", max);
265
266 /* pci writes may still be posted */
267 spin_unlock_irqrestore (&dev->lock, flags);
268 return 0;
269}
270
271static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec)
272{
273 u32 result;
274
275 do {
276 result = readl (ptr);
277 if (result == ~(u32)0) /* "device unplugged" */
278 return -ENODEV;
279 result &= mask;
280 if (result == done)
281 return 0;
282 udelay (1);
283 usec--;
284 } while (usec > 0);
285 return -ETIMEDOUT;
286}
287
901b3d75 288static const struct usb_ep_ops net2280_ep_ops;
1da177e4
LT		 289
290static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep)
291{
292 u32 tmp;
293
294 ep->desc = NULL;
295 INIT_LIST_HEAD (&ep->queue);
296
297 ep->ep.maxpacket = ~0;
298 ep->ep.ops = &net2280_ep_ops;
299
300 /* disable the dma, irqs, endpoint... */
301 if (ep->dma) {
302 writel (0, &ep->dma->dmactl);
303 writel ( (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
304 | (1 << DMA_TRANSACTION_DONE_INTERRUPT)
305 | (1 << DMA_ABORT)
306 , &ep->dma->dmastat);
307
308 tmp = readl (&regs->pciirqenb0);
309 tmp &= ~(1 << ep->num);
310 writel (tmp, &regs->pciirqenb0);
311 } else {
312 tmp = readl (&regs->pciirqenb1);
313 tmp &= ~(1 << (8 + ep->num)); /* completion */
314 writel (tmp, &regs->pciirqenb1);
315 }
316 writel (0, &ep->regs->ep_irqenb);
317
318 /* init to our chosen defaults, notably so that we NAK OUT
319 * packets until the driver queues a read (+note erratum 0112)
320 */
950ee4c8
GL		 321 if (!ep->is_in || ep->dev->pdev->device == 0x2280) {
322 tmp = (1 << SET_NAK_OUT_PACKETS_MODE)
1da177e4
LT		 323 | (1 << SET_NAK_OUT_PACKETS)
324 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
325 | (1 << CLEAR_INTERRUPT_MODE);
950ee4c8
GL		 326 } else {
327 /* added for 2282 */
328 tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE)
329 | (1 << CLEAR_NAK_OUT_PACKETS)
330 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
331 | (1 << CLEAR_INTERRUPT_MODE);
332 }
1da177e4
LT		 333
334 if (ep->num != 0) {
335 tmp |= (1 << CLEAR_ENDPOINT_TOGGLE)
336 | (1 << CLEAR_ENDPOINT_HALT);
337 }
338 writel (tmp, &ep->regs->ep_rsp);
339
340 /* scrub most status bits, and flush any fifo state */
950ee4c8
GL		 341 if (ep->dev->pdev->device == 0x2280)
342 tmp = (1 << FIFO_OVERFLOW)
343 | (1 << FIFO_UNDERFLOW);
344 else
345 tmp = 0;
346
347 writel (tmp | (1 << TIMEOUT)
1da177e4
LT		 348 | (1 << USB_STALL_SENT)
349 | (1 << USB_IN_NAK_SENT)
350 | (1 << USB_IN_ACK_RCVD)
351 | (1 << USB_OUT_PING_NAK_SENT)
352 | (1 << USB_OUT_ACK_SENT)
1da177e4
LT		 353 | (1 << FIFO_FLUSH)
354 | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
355 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
356 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
357 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
358 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
359 | (1 << DATA_IN_TOKEN_INTERRUPT)
360 , &ep->regs->ep_stat);
361
362 /* fifo size is handled separately */
363}
364
365static void nuke (struct net2280_ep *);
366
367static int net2280_disable (struct usb_ep *_ep)
368{
369 struct net2280_ep *ep;
370 unsigned long flags;
371
372 ep = container_of (_ep, struct net2280_ep, ep);
373 if (!_ep || !ep->desc || _ep->name == ep0name)
374 return -EINVAL;
375
376 spin_lock_irqsave (&ep->dev->lock, flags);
377 nuke (ep);
378 ep_reset (ep->dev->regs, ep);
379
380 VDEBUG (ep->dev, "disabled %s %s\n",
381 ep->dma ? "dma" : "pio", _ep->name);
382
383 /* synch memory views with the device */
384 (void) readl (&ep->regs->ep_cfg);
385
386 if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4)
387 ep->dma = &ep->dev->dma [ep->num - 1];
388
389 spin_unlock_irqrestore (&ep->dev->lock, flags);
390 return 0;
391}
392
393/*-------------------------------------------------------------------------*/
394
395static struct usb_request *
55016f10 396net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
1da177e4
LT		 397{
398 struct net2280_ep *ep;
399 struct net2280_request *req;
400
401 if (!_ep)
402 return NULL;
403 ep = container_of (_ep, struct net2280_ep, ep);
404
7039f422 405 req = kzalloc(sizeof(*req), gfp_flags);
1da177e4
LT		 406 if (!req)
407 return NULL;
408
1da177e4
LT		 409 req->req.dma = DMA_ADDR_INVALID;
410 INIT_LIST_HEAD (&req->queue);
411
412 /* this dma descriptor may be swapped with the previous dummy */
413 if (ep->dma) {
414 struct net2280_dma *td;
415
416 td = pci_pool_alloc (ep->dev->requests, gfp_flags,
417 &req->td_dma);
418 if (!td) {
419 kfree (req);
420 return NULL;
421 }
422 td->dmacount = 0; /* not VALID */
551509d2 423 td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
1da177e4
LT		 424 td->dmadesc = td->dmaaddr;
425 req->td = td;
426 }
427 return &req->req;
428}
429
430static void
431net2280_free_request (struct usb_ep *_ep, struct usb_request *_req)
432{
433 struct net2280_ep *ep;
434 struct net2280_request *req;
435
436 ep = container_of (_ep, struct net2280_ep, ep);
437 if (!_ep || !_req)
438 return;
439
440 req = container_of (_req, struct net2280_request, req);
441 WARN_ON (!list_empty (&req->queue));
442 if (req->td)
443 pci_pool_free (ep->dev->requests, req->td, req->td_dma);
444 kfree (req);
445}
446
447/*-------------------------------------------------------------------------*/
448
1da177e4
LT		 449/* load a packet into the fifo we use for usb IN transfers.
450 * works for all endpoints.
451 *
452 * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
453 * at a time, but this code is simpler because it knows it only writes
454 * one packet. ep-a..ep-d should use dma instead.
455 */
456static void
457write_fifo (struct net2280_ep *ep, struct usb_request *req)
458{
459 struct net2280_ep_regs __iomem *regs = ep->regs;
460 u8 *buf;
461 u32 tmp;
462 unsigned count, total;
463
464 /* INVARIANT: fifo is currently empty. (testable) */
465
466 if (req) {
467 buf = req->buf + req->actual;
468 prefetch (buf);
469 total = req->length - req->actual;
470 } else {
471 total = 0;
472 buf = NULL;
473 }
474
475 /* write just one packet at a time */
476 count = ep->ep.maxpacket;
477 if (count > total) /* min() cannot be used on a bitfield */
478 count = total;
479
480 VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
481 ep->ep.name, count,
482 (count != ep->ep.maxpacket) ? " (short)" : "",
483 req);
484 while (count >= 4) {
485 /* NOTE be careful if you try to align these. fifo lines
486 * should normally be full (4 bytes) and successive partial
487 * lines are ok only in certain cases.
488 */
489 tmp = get_unaligned ((u32 *)buf);
490 cpu_to_le32s (&tmp);
491 writel (tmp, &regs->ep_data);
492 buf += 4;
493 count -= 4;
494 }
495
496 /* last fifo entry is "short" unless we wrote a full packet.
497 * also explicitly validate last word in (periodic) transfers
498 * when maxpacket is not a multiple of 4 bytes.
499 */
500 if (count || total < ep->ep.maxpacket) {
501 tmp = count ? get_unaligned ((u32 *)buf) : count;
502 cpu_to_le32s (&tmp);
503 set_fifo_bytecount (ep, count & 0x03);
504 writel (tmp, &regs->ep_data);
505 }
506
507 /* pci writes may still be posted */
508}
509
510/* work around erratum 0106: PCI and USB race over the OUT fifo.
511 * caller guarantees chiprev 0100, out endpoint is NAKing, and
512 * there's no real data in the fifo.
513 *
514 * NOTE: also used in cases where that erratum doesn't apply:
515 * where the host wrote "too much" data to us.
516 */
517static void out_flush (struct net2280_ep *ep)
518{
519 u32 __iomem *statp;
520 u32 tmp;
521
522 ASSERT_OUT_NAKING (ep);
523
524 statp = &ep->regs->ep_stat;
525 writel ( (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
526 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
527 , statp);
528 writel ((1 << FIFO_FLUSH), statp);
529 mb ();
530 tmp = readl (statp);
531 if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
532 /* high speed did bulk NYET; fifo isn't filling */
533 && ep->dev->gadget.speed == USB_SPEED_FULL) {
534 unsigned usec;
535
536 usec = 50; /* 64 byte bulk/interrupt */
537 handshake (statp, (1 << USB_OUT_PING_NAK_SENT),
538 (1 << USB_OUT_PING_NAK_SENT), usec);
539 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
540 }
541}
542
543/* unload packet(s) from the fifo we use for usb OUT transfers.
544 * returns true iff the request completed, because of short packet
545 * or the request buffer having filled with full packets.
546 *
547 * for ep-a..ep-d this will read multiple packets out when they
548 * have been accepted.
549 */
550static int
551read_fifo (struct net2280_ep *ep, struct net2280_request *req)
552{
553 struct net2280_ep_regs __iomem *regs = ep->regs;
554 u8 *buf = req->req.buf + req->req.actual;
555 unsigned count, tmp, is_short;
556 unsigned cleanup = 0, prevent = 0;
557
558 /* erratum 0106 ... packets coming in during fifo reads might
559 * be incompletely rejected. not all cases have workarounds.
560 */
561 if (ep->dev->chiprev == 0x0100
562 && ep->dev->gadget.speed == USB_SPEED_FULL) {
563 udelay (1);
564 tmp = readl (&ep->regs->ep_stat);
565 if ((tmp & (1 << NAK_OUT_PACKETS)))
566 cleanup = 1;
567 else if ((tmp & (1 << FIFO_FULL))) {
568 start_out_naking (ep);
569 prevent = 1;
570 }
571 /* else: hope we don't see the problem */
572 }
573
574 /* never overflow the rx buffer. the fifo reads packets until
575 * it sees a short one; we might not be ready for them all.
576 */
577 prefetchw (buf);
578 count = readl (&regs->ep_avail);
579 if (unlikely (count == 0)) {
580 udelay (1);
581 tmp = readl (&ep->regs->ep_stat);
582 count = readl (&regs->ep_avail);
583 /* handled that data already? */
584 if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0)
585 return 0;
586 }
587
588 tmp = req->req.length - req->req.actual;
589 if (count > tmp) {
590 /* as with DMA, data overflow gets flushed */
591 if ((tmp % ep->ep.maxpacket) != 0) {
592 ERROR (ep->dev,
593 "%s out fifo %d bytes, expected %d\n",
594 ep->ep.name, count, tmp);
595 req->req.status = -EOVERFLOW;
596 cleanup = 1;
597 /* NAK_OUT_PACKETS will be set, so flushing is safe;
598 * the next read will start with the next packet
599 */
600 } /* else it's a ZLP, no worries */
601 count = tmp;
602 }
603 req->req.actual += count;
604
605 is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
606
607 VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
608 ep->ep.name, count, is_short ? " (short)" : "",
609 cleanup ? " flush" : "", prevent ? " nak" : "",
610 req, req->req.actual, req->req.length);
611
612 while (count >= 4) {
613 tmp = readl (&regs->ep_data);
614 cpu_to_le32s (&tmp);
615 put_unaligned (tmp, (u32 *)buf);
616 buf += 4;
617 count -= 4;
618 }
619 if (count) {
620 tmp = readl (&regs->ep_data);
621 /* LE conversion is implicit here: */
622 do {
623 *buf++ = (u8) tmp;
624 tmp >>= 8;
625 } while (--count);
626 }
627 if (cleanup)
628 out_flush (ep);
629 if (prevent) {
630 writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
631 (void) readl (&ep->regs->ep_rsp);
632 }
633
634 return is_short || ((req->req.actual == req->req.length)
635 && !req->req.zero);
636}
637
638/* fill out dma descriptor to match a given request */
639static void
640fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid)
641{
642 struct net2280_dma *td = req->td;
643 u32 dmacount = req->req.length;
644
645 /* don't let DMA continue after a short OUT packet,
646 * so overruns can't affect the next transfer.
647 * in case of overruns on max-size packets, we can't
648 * stop the fifo from filling but we can flush it.
649 */
650 if (ep->is_in)
651 dmacount |= (1 << DMA_DIRECTION);
901b3d75
DB		 652 if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0)
653 || ep->dev->pdev->device != 0x2280)
1da177e4
LT		 654 dmacount |= (1 << END_OF_CHAIN);
655
656 req->valid = valid;
657 if (valid)
658 dmacount |= (1 << VALID_BIT);
659 if (likely(!req->req.no_interrupt || !use_dma_chaining))
660 dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE);
661
662 /* td->dmadesc = previously set by caller */
663 td->dmaaddr = cpu_to_le32 (req->req.dma);
664
665 /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
666 wmb ();
da2bbdcc 667 td->dmacount = cpu_to_le32(dmacount);
1da177e4
LT		 668}
669
670static const u32 dmactl_default =
671 (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
672 | (1 << DMA_CLEAR_COUNT_ENABLE)
673 /* erratum 0116 workaround part 1 (use POLLING) */
674 | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE)
675 | (1 << DMA_VALID_BIT_POLLING_ENABLE)
676 | (1 << DMA_VALID_BIT_ENABLE)
677 | (1 << DMA_SCATTER_GATHER_ENABLE)
678 /* erratum 0116 workaround part 2 (no AUTOSTART) */
679 | (1 << DMA_ENABLE);
680
681static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma)
682{
683 handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50);
684}
685
686static inline void stop_dma (struct net2280_dma_regs __iomem *dma)
687{
688 writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl);
689 spin_stop_dma (dma);
690}
691
692static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma)
693{
694 struct net2280_dma_regs __iomem *dma = ep->dma;
950ee4c8 695 unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION);
1da177e4 696
950ee4c8
GL		 697 if (ep->dev->pdev->device != 0x2280)
698 tmp |= (1 << END_OF_CHAIN);
699
700 writel (tmp, &dma->dmacount);
1da177e4
LT		 701 writel (readl (&dma->dmastat), &dma->dmastat);
702
703 writel (td_dma, &dma->dmadesc);
704 writel (dmactl, &dma->dmactl);
705
706 /* erratum 0116 workaround part 3: pci arbiter away from net2280 */
707 (void) readl (&ep->dev->pci->pcimstctl);
708
709 writel ((1 << DMA_START), &dma->dmastat);
710
711 if (!ep->is_in)
712 stop_out_naking (ep);
713}
714
715static void start_dma (struct net2280_ep *ep, struct net2280_request *req)
716{
717 u32 tmp;
718 struct net2280_dma_regs __iomem *dma = ep->dma;
719
720 /* FIXME can't use DMA for ZLPs */
721
722 /* on this path we "know" there's no dma active (yet) */
723 WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE));
724 writel (0, &ep->dma->dmactl);
725
726 /* previous OUT packet might have been short */
727 if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat))
901b3d75 728 & (1 << NAK_OUT_PACKETS)) != 0) {
1da177e4
LT		 729 writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT),
730 &ep->regs->ep_stat);
731
732 tmp = readl (&ep->regs->ep_avail);
733 if (tmp) {
734 writel (readl (&dma->dmastat), &dma->dmastat);
735
736 /* transfer all/some fifo data */
737 writel (req->req.dma, &dma->dmaaddr);
738 tmp = min (tmp, req->req.length);
739
740 /* dma irq, faking scatterlist status */
741 req->td->dmacount = cpu_to_le32 (req->req.length - tmp);
742 writel ((1 << DMA_DONE_INTERRUPT_ENABLE)
743 | tmp, &dma->dmacount);
744 req->td->dmadesc = 0;
745 req->valid = 1;
746
747 writel ((1 << DMA_ENABLE), &dma->dmactl);
748 writel ((1 << DMA_START), &dma->dmastat);
749 return;
750 }
751 }
752
753 tmp = dmactl_default;
754
755 /* force packet boundaries between dma requests, but prevent the
756 * controller from automagically writing a last "short" packet
757 * (zero length) unless the driver explicitly said to do that.
758 */
759 if (ep->is_in) {
760 if (likely ((req->req.length % ep->ep.maxpacket) != 0
761 || req->req.zero)) {
762 tmp |= (1 << DMA_FIFO_VALIDATE);
763 ep->in_fifo_validate = 1;
764 } else
765 ep->in_fifo_validate = 0;
766 }
767
768 /* init req->td, pointing to the current dummy */
769 req->td->dmadesc = cpu_to_le32 (ep->td_dma);
770 fill_dma_desc (ep, req, 1);
771
772 if (!use_dma_chaining)
551509d2 773 req->td->dmacount |= cpu_to_le32 (1 << END_OF_CHAIN);
1da177e4
LT		 774
775 start_queue (ep, tmp, req->td_dma);
776}
777
778static inline void
779queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid)
780{
781 struct net2280_dma *end;
782 dma_addr_t tmp;
783
784 /* swap new dummy for old, link; fill and maybe activate */
785 end = ep->dummy;
786 ep->dummy = req->td;
787 req->td = end;
788
789 tmp = ep->td_dma;
790 ep->td_dma = req->td_dma;
791 req->td_dma = tmp;
792
793 end->dmadesc = cpu_to_le32 (ep->td_dma);
794
795 fill_dma_desc (ep, req, valid);
796}
797
798static void
799done (struct net2280_ep *ep, struct net2280_request *req, int status)
800{
801 struct net2280 *dev;
802 unsigned stopped = ep->stopped;
803
804 list_del_init (&req->queue);
805
806 if (req->req.status == -EINPROGRESS)
807 req->req.status = status;
808 else
809 status = req->req.status;
810
811 dev = ep->dev;
ae4d7933
FB		 812 if (ep->dma)
813 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
1da177e4
LT		 814
815 if (status && status != -ESHUTDOWN)
816 VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n",
817 ep->ep.name, &req->req, status,
818 req->req.actual, req->req.length);
819
820 /* don't modify queue heads during completion callback */
821 ep->stopped = 1;
822 spin_unlock (&dev->lock);
823 req->req.complete (&ep->ep, &req->req);
824 spin_lock (&dev->lock);
825 ep->stopped = stopped;
826}
827
828/*-------------------------------------------------------------------------*/
829
830static int
55016f10 831net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
1da177e4
LT		 832{
833 struct net2280_request *req;
834 struct net2280_ep *ep;
835 struct net2280 *dev;
836 unsigned long flags;
837
838 /* we always require a cpu-view buffer, so that we can
839 * always use pio (as fallback or whatever).
840 */
841 req = container_of (_req, struct net2280_request, req);
842 if (!_req || !_req->complete || !_req->buf
843 || !list_empty (&req->queue))
844 return -EINVAL;
845 if (_req->length > (~0 & DMA_BYTE_COUNT_MASK))
846 return -EDOM;
847 ep = container_of (_ep, struct net2280_ep, ep);
848 if (!_ep || (!ep->desc && ep->num != 0))
849 return -EINVAL;
850 dev = ep->dev;
851 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
852 return -ESHUTDOWN;
853
854 /* FIXME implement PIO fallback for ZLPs with DMA */
855 if (ep->dma && _req->length == 0)
856 return -EOPNOTSUPP;
857
858 /* set up dma mapping in case the caller didn't */
ae4d7933
FB		 859 if (ep->dma) {
860 int ret;
861
862 ret = usb_gadget_map_request(&dev->gadget, _req,
863 ep->is_in);
864 if (ret)
865 return ret;
1da177e4
LT		 866 }
867
868#if 0
869 VDEBUG (dev, "%s queue req %p, len %d buf %p\n",
870 _ep->name, _req, _req->length, _req->buf);
871#endif
872
873 spin_lock_irqsave (&dev->lock, flags);
874
875 _req->status = -EINPROGRESS;
876 _req->actual = 0;
877
878 /* kickstart this i/o queue? */
879 if (list_empty (&ep->queue) && !ep->stopped) {
880 /* use DMA if the endpoint supports it, else pio */
881 if (ep->dma)
882 start_dma (ep, req);
883 else {
884 /* maybe there's no control data, just status ack */
885 if (ep->num == 0 && _req->length == 0) {
886 allow_status (ep);
887 done (ep, req, 0);
888 VDEBUG (dev, "%s status ack\n", ep->ep.name);
889 goto done;
890 }
891
892 /* PIO ... stuff the fifo, or unblock it. */
893 if (ep->is_in)
894 write_fifo (ep, _req);
895 else if (list_empty (&ep->queue)) {
896 u32 s;
897
898 /* OUT FIFO might have packet(s) buffered */
899 s = readl (&ep->regs->ep_stat);
900 if ((s & (1 << FIFO_EMPTY)) == 0) {
901 /* note: _req->short_not_ok is
902 * ignored here since PIO _always_
903 * stops queue advance here, and
904 * _req->status doesn't change for
905 * short reads (only _req->actual)
906 */
907 if (read_fifo (ep, req)) {
908 done (ep, req, 0);
909 if (ep->num == 0)
910 allow_status (ep);
911 /* don't queue it */
912 req = NULL;
913 } else
914 s = readl (&ep->regs->ep_stat);
915 }
916
917 /* don't NAK, let the fifo fill */
918 if (req && (s & (1 << NAK_OUT_PACKETS)))
919 writel ((1 << CLEAR_NAK_OUT_PACKETS),
920 &ep->regs->ep_rsp);
921 }
922 }
923
924 } else if (ep->dma) {
925 int valid = 1;
926
927 if (ep->is_in) {
928 int expect;
929
930 /* preventing magic zlps is per-engine state, not
931 * per-transfer; irq logic must recover hiccups.
932 */
933 expect = likely (req->req.zero
934 || (req->req.length % ep->ep.maxpacket) != 0);
935 if (expect != ep->in_fifo_validate)
936 valid = 0;
937 }
938 queue_dma (ep, req, valid);
939
940 } /* else the irq handler advances the queue. */
941
1f26e28d 942 ep->responded = 1;
1da177e4
LT		 943 if (req)
944 list_add_tail (&req->queue, &ep->queue);
945done:
946 spin_unlock_irqrestore (&dev->lock, flags);
947
948 /* pci writes may still be posted */
949 return 0;
950}
951
952static inline void
953dma_done (
954 struct net2280_ep *ep,
955 struct net2280_request *req,
956 u32 dmacount,
957 int status
958)
959{
960 req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
961 done (ep, req, status);
962}
963
964static void restart_dma (struct net2280_ep *ep);
965
966static void scan_dma_completions (struct net2280_ep *ep)
967{
968 /* only look at descriptors that were "naturally" retired,
969 * so fifo and list head state won't matter
970 */
971 while (!list_empty (&ep->queue)) {
972 struct net2280_request *req;
973 u32 tmp;
974
975 req = list_entry (ep->queue.next,
976 struct net2280_request, queue);
977 if (!req->valid)
978 break;
979 rmb ();
980 tmp = le32_to_cpup (&req->td->dmacount);
981 if ((tmp & (1 << VALID_BIT)) != 0)
982 break;
983
984 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
985 * cases where DMA must be aborted; this code handles
986 * all non-abort DMA completions.
987 */
988 if (unlikely (req->td->dmadesc == 0)) {
989 /* paranoia */
990 tmp = readl (&ep->dma->dmacount);
991 if (tmp & DMA_BYTE_COUNT_MASK)
992 break;
993 /* single transfer mode */
994 dma_done (ep, req, tmp, 0);
995 break;
996 } else if (!ep->is_in
997 && (req->req.length % ep->ep.maxpacket) != 0) {
998 tmp = readl (&ep->regs->ep_stat);
999
1000 /* AVOID TROUBLE HERE by not issuing short reads from
1001 * your gadget driver. That helps avoids errata 0121,
1002 * 0122, and 0124; not all cases trigger the warning.
1003 */
1004 if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
b6c63937 1005 WARNING (ep->dev, "%s lost packet sync!\n",
1da177e4
LT		 1006 ep->ep.name);
1007 req->req.status = -EOVERFLOW;
1008 } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) {
1009 /* fifo gets flushed later */
1010 ep->out_overflow = 1;
1011 DEBUG (ep->dev, "%s dma, discard %d len %d\n",
1012 ep->ep.name, tmp,
1013 req->req.length);
1014 req->req.status = -EOVERFLOW;
1015 }
1016 }
1017 dma_done (ep, req, tmp, 0);
1018 }
1019}
1020
1021static void restart_dma (struct net2280_ep *ep)
1022{
1023 struct net2280_request *req;
1024 u32 dmactl = dmactl_default;
1025
1026 if (ep->stopped)
1027 return;
1028 req = list_entry (ep->queue.next, struct net2280_request, queue);
1029
1030 if (!use_dma_chaining) {
1031 start_dma (ep, req);
1032 return;
1033 }
1034
1035 /* the 2280 will be processing the queue unless queue hiccups after
1036 * the previous transfer:
1037 * IN: wanted automagic zlp, head doesn't (or vice versa)
1038 * DMA_FIFO_VALIDATE doesn't init from dma descriptors.
1039 * OUT: was "usb-short", we must restart.
1040 */
1041 if (ep->is_in && !req->valid) {
1042 struct net2280_request *entry, *prev = NULL;
1043 int reqmode, done = 0;
1044
1045 DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td);
1046 ep->in_fifo_validate = likely (req->req.zero
1047 || (req->req.length % ep->ep.maxpacket) != 0);
1048 if (ep->in_fifo_validate)
1049 dmactl |= (1 << DMA_FIFO_VALIDATE);
1050 list_for_each_entry (entry, &ep->queue, queue) {
320f3459 1051 __le32 dmacount;
1da177e4
LT		 1052
1053 if (entry == req)
1054 continue;
1055 dmacount = entry->td->dmacount;
1056 if (!done) {
1057 reqmode = likely (entry->req.zero
1058 || (entry->req.length
1059 % ep->ep.maxpacket) != 0);
1060 if (reqmode == ep->in_fifo_validate) {
1061 entry->valid = 1;
1062 dmacount |= valid_bit;
1063 entry->td->dmacount = dmacount;
1064 prev = entry;
1065 continue;
1066 } else {
1067 /* force a hiccup */
1068 prev->td->dmacount |= dma_done_ie;
1069 done = 1;
1070 }
1071 }
1072
1073 /* walk the rest of the queue so unlinks behave */
1074 entry->valid = 0;
1075 dmacount &= ~valid_bit;
1076 entry->td->dmacount = dmacount;
1077 prev = entry;
1078 }
1079 }
1080
1081 writel (0, &ep->dma->dmactl);
1082 start_queue (ep, dmactl, req->td_dma);
1083}
1084
1085static void abort_dma (struct net2280_ep *ep)
1086{
1087 /* abort the current transfer */
1088 if (likely (!list_empty (&ep->queue))) {
1089 /* FIXME work around errata 0121, 0122, 0124 */
1090 writel ((1 << DMA_ABORT), &ep->dma->dmastat);
1091 spin_stop_dma (ep->dma);
1092 } else
1093 stop_dma (ep->dma);
1094 scan_dma_completions (ep);
1095}
1096
1097/* dequeue ALL requests */
1098static void nuke (struct net2280_ep *ep)
1099{
1100 struct net2280_request *req;
1101
1102 /* called with spinlock held */
1103 ep->stopped = 1;
1104 if (ep->dma)
1105 abort_dma (ep);
1106 while (!list_empty (&ep->queue)) {
1107 req = list_entry (ep->queue.next,
1108 struct net2280_request,
1109 queue);
1110 done (ep, req, -ESHUTDOWN);
1111 }
1112}
1113
1114/* dequeue JUST ONE request */
1115static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req)
1116{
1117 struct net2280_ep *ep;
1118 struct net2280_request *req;
1119 unsigned long flags;
1120 u32 dmactl;
1121 int stopped;
1122
1123 ep = container_of (_ep, struct net2280_ep, ep);
1124 if (!_ep || (!ep->desc && ep->num != 0) || !_req)
1125 return -EINVAL;
1126
1127 spin_lock_irqsave (&ep->dev->lock, flags);
1128 stopped = ep->stopped;
1129
1130 /* quiesce dma while we patch the queue */
1131 dmactl = 0;
1132 ep->stopped = 1;
1133 if (ep->dma) {
1134 dmactl = readl (&ep->dma->dmactl);
1135 /* WARNING erratum 0127 may kick in ... */
1136 stop_dma (ep->dma);
1137 scan_dma_completions (ep);
1138 }
1139
1140 /* make sure it's still queued on this endpoint */
1141 list_for_each_entry (req, &ep->queue, queue) {
1142 if (&req->req == _req)
1143 break;
1144 }
1145 if (&req->req != _req) {
1146 spin_unlock_irqrestore (&ep->dev->lock, flags);
1147 return -EINVAL;
1148 }
1149
1150 /* queue head may be partially complete. */
1151 if (ep->queue.next == &req->queue) {
1152 if (ep->dma) {
1153 DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name);
1154 _req->status = -ECONNRESET;
1155 abort_dma (ep);
1156 if (likely (ep->queue.next == &req->queue)) {
1157 // NOTE: misreports single-transfer mode
1158 req->td->dmacount = 0; /* invalidate */
1159 dma_done (ep, req,
1160 readl (&ep->dma->dmacount),
1161 -ECONNRESET);
1162 }
1163 } else {
1164 DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name);
1165 done (ep, req, -ECONNRESET);
1166 }
1167 req = NULL;
1168
1169 /* patch up hardware chaining data */
1170 } else if (ep->dma && use_dma_chaining) {
1171 if (req->queue.prev == ep->queue.next) {
1172 writel (le32_to_cpu (req->td->dmadesc),
1173 &ep->dma->dmadesc);
1174 if (req->td->dmacount & dma_done_ie)
1175 writel (readl (&ep->dma->dmacount)
320f3459 1176 | le32_to_cpu(dma_done_ie),
1da177e4
LT		 1177 &ep->dma->dmacount);
1178 } else {
1179 struct net2280_request *prev;
1180
1181 prev = list_entry (req->queue.prev,
1182 struct net2280_request, queue);
1183 prev->td->dmadesc = req->td->dmadesc;
1184 if (req->td->dmacount & dma_done_ie)
1185 prev->td->dmacount |= dma_done_ie;
1186 }
1187 }
1188
1189 if (req)
1190 done (ep, req, -ECONNRESET);
1191 ep->stopped = stopped;
1192
1193 if (ep->dma) {
1194 /* turn off dma on inactive queues */
1195 if (list_empty (&ep->queue))
1196 stop_dma (ep->dma);
1197 else if (!ep->stopped) {
1198 /* resume current request, or start new one */
1199 if (req)
1200 writel (dmactl, &ep->dma->dmactl);
1201 else
1202 start_dma (ep, list_entry (ep->queue.next,
1203 struct net2280_request, queue));
1204 }
1205 }
1206
1207 spin_unlock_irqrestore (&ep->dev->lock, flags);
1208 return 0;
1209}
1210
1211/*-------------------------------------------------------------------------*/
1212
1213static int net2280_fifo_status (struct usb_ep *_ep);
1214
1215static int
8066134f 1216net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1da177e4
LT		 1217{
1218 struct net2280_ep *ep;
1219 unsigned long flags;
1220 int retval = 0;
1221
1222 ep = container_of (_ep, struct net2280_ep, ep);
1223 if (!_ep || (!ep->desc && ep->num != 0))
1224 return -EINVAL;
1225 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1226 return -ESHUTDOWN;
1227 if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1228 == USB_ENDPOINT_XFER_ISOC)
1229 return -EINVAL;
1230
1231 spin_lock_irqsave (&ep->dev->lock, flags);
1232 if (!list_empty (&ep->queue))
1233 retval = -EAGAIN;
1234 else if (ep->is_in && value && net2280_fifo_status (_ep) != 0)
1235 retval = -EAGAIN;
1236 else {
8066134f
AS		 1237 VDEBUG (ep->dev, "%s %s %s\n", _ep->name,
1238 value ? "set" : "clear",
1239 wedged ? "wedge" : "halt");
1da177e4
LT		 1240 /* set/clear, then synch memory views with the device */
1241 if (value) {
1242 if (ep->num == 0)
1243 ep->dev->protocol_stall = 1;
1244 else
1245 set_halt (ep);
8066134f
AS		 1246 if (wedged)
1247 ep->wedged = 1;
1248 } else {
1da177e4 1249 clear_halt (ep);
8066134f
AS		 1250 ep->wedged = 0;
1251 }
1da177e4
LT		 1252 (void) readl (&ep->regs->ep_rsp);
1253 }
1254 spin_unlock_irqrestore (&ep->dev->lock, flags);
1255
1256 return retval;
1257}
1258
8066134f
AS		 1259static int
1260net2280_set_halt(struct usb_ep *_ep, int value)
1261{
1262 return net2280_set_halt_and_wedge(_ep, value, 0);
1263}
1264
1265static int
1266net2280_set_wedge(struct usb_ep *_ep)
1267{
1268 if (!_ep || _ep->name == ep0name)
1269 return -EINVAL;
1270 return net2280_set_halt_and_wedge(_ep, 1, 1);
1271}
1272
1da177e4
LT		 1273static int
1274net2280_fifo_status (struct usb_ep *_ep)
1275{
1276 struct net2280_ep *ep;
1277 u32 avail;
1278
1279 ep = container_of (_ep, struct net2280_ep, ep);
1280 if (!_ep || (!ep->desc && ep->num != 0))
1281 return -ENODEV;
1282 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1283 return -ESHUTDOWN;
1284
1285 avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1);
1286 if (avail > ep->fifo_size)
1287 return -EOVERFLOW;
1288 if (ep->is_in)
1289 avail = ep->fifo_size - avail;
1290 return avail;
1291}
1292
1293static void
1294net2280_fifo_flush (struct usb_ep *_ep)
1295{
1296 struct net2280_ep *ep;
1297
1298 ep = container_of (_ep, struct net2280_ep, ep);
1299 if (!_ep || (!ep->desc && ep->num != 0))
1300 return;
1301 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1302 return;
1303
1304 writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
1305 (void) readl (&ep->regs->ep_rsp);
1306}
1307
901b3d75 1308static const struct usb_ep_ops net2280_ep_ops = {
1da177e4
LT		 1309 .enable = net2280_enable,
1310 .disable = net2280_disable,
1311
1312 .alloc_request = net2280_alloc_request,
1313 .free_request = net2280_free_request,
1314
1da177e4
LT		 1315 .queue = net2280_queue,
1316 .dequeue = net2280_dequeue,
1317
1318 .set_halt = net2280_set_halt,
8066134f 1319 .set_wedge = net2280_set_wedge,
1da177e4
LT		 1320 .fifo_status = net2280_fifo_status,
1321 .fifo_flush = net2280_fifo_flush,
1322};
1323
1324/*-------------------------------------------------------------------------*/
1325
1326static int net2280_get_frame (struct usb_gadget *_gadget)
1327{
1328 struct net2280 *dev;
1329 unsigned long flags;
1330 u16 retval;
1331
1332 if (!_gadget)
1333 return -ENODEV;
1334 dev = container_of (_gadget, struct net2280, gadget);
1335 spin_lock_irqsave (&dev->lock, flags);
1336 retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff;
1337 spin_unlock_irqrestore (&dev->lock, flags);
1338 return retval;
1339}
1340
1341static int net2280_wakeup (struct usb_gadget *_gadget)
1342{
1343 struct net2280 *dev;
1344 u32 tmp;
1345 unsigned long flags;
1346
1347 if (!_gadget)
1348 return 0;
1349 dev = container_of (_gadget, struct net2280, gadget);
1350
1351 spin_lock_irqsave (&dev->lock, flags);
1352 tmp = readl (&dev->usb->usbctl);
1353 if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE))
1354 writel (1 << GENERATE_RESUME, &dev->usb->usbstat);
1355 spin_unlock_irqrestore (&dev->lock, flags);
1356
1357 /* pci writes may still be posted */
1358 return 0;
1359}
1360
1361static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value)
1362{
1363 struct net2280 *dev;
1364 u32 tmp;
1365 unsigned long flags;
1366
1367 if (!_gadget)
1368 return 0;
1369 dev = container_of (_gadget, struct net2280, gadget);
1370
1371 spin_lock_irqsave (&dev->lock, flags);
1372 tmp = readl (&dev->usb->usbctl);
1373 if (value)
1374 tmp |= (1 << SELF_POWERED_STATUS);
1375 else
1376 tmp &= ~(1 << SELF_POWERED_STATUS);
1377 writel (tmp, &dev->usb->usbctl);
1378 spin_unlock_irqrestore (&dev->lock, flags);
1379
1380 return 0;
1381}
1382
1383static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1384{
1385 struct net2280 *dev;
1386 u32 tmp;
1387 unsigned long flags;
1388
1389 if (!_gadget)
1390 return -ENODEV;
1391 dev = container_of (_gadget, struct net2280, gadget);
1392
1393 spin_lock_irqsave (&dev->lock, flags);
1394 tmp = readl (&dev->usb->usbctl);
1395 dev->softconnect = (is_on != 0);
1396 if (is_on)
1397 tmp |= (1 << USB_DETECT_ENABLE);
1398 else
1399 tmp &= ~(1 << USB_DETECT_ENABLE);
1400 writel (tmp, &dev->usb->usbctl);
1401 spin_unlock_irqrestore (&dev->lock, flags);
1402
1403 return 0;
1404}
1405
4cf5e00b
FB		 1406static int net2280_start(struct usb_gadget *_gadget,
1407 struct usb_gadget_driver *driver);
1408static int net2280_stop(struct usb_gadget *_gadget,
1409 struct usb_gadget_driver *driver);
0f91349b 1410
1da177e4
LT		 1411static const struct usb_gadget_ops net2280_ops = {
1412 .get_frame = net2280_get_frame,
1413 .wakeup = net2280_wakeup,
1414 .set_selfpowered = net2280_set_selfpowered,
1415 .pullup = net2280_pullup,
4cf5e00b
FB		 1416 .udc_start = net2280_start,
1417 .udc_stop = net2280_stop,
1da177e4
LT		 1418};
1419
1420/*-------------------------------------------------------------------------*/
1421
1422#ifdef CONFIG_USB_GADGET_DEBUG_FILES
1423
1424/* FIXME move these into procfs, and use seq_file.
1425 * Sysfs _still_ doesn't behave for arbitrarily sized files,
1426 * and also doesn't help products using this with 2.4 kernels.
1427 */
1428
1429/* "function" sysfs attribute */
1430static ssize_t
10523b3b 1431show_function (struct device *_dev, struct device_attribute *attr, char *buf)
1da177e4
LT		 1432{
1433 struct net2280 *dev = dev_get_drvdata (_dev);
1434
1435 if (!dev->driver
1436 || !dev->driver->function
1437 || strlen (dev->driver->function) > PAGE_SIZE)
1438 return 0;
1439 return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function);
1440}
1441static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
1442
62fb44b9
DH		 1443static ssize_t net2280_show_registers(struct device *_dev,
1444 struct device_attribute *attr, char *buf)
1da177e4
LT		 1445{
1446 struct net2280 *dev;
1447 char *next;
1448 unsigned size, t;
1449 unsigned long flags;
1450 int i;
1451 u32 t1, t2;
30e69598 1452 const char *s;
1da177e4
LT		 1453
1454 dev = dev_get_drvdata (_dev);
1455 next = buf;
1456 size = PAGE_SIZE;
1457 spin_lock_irqsave (&dev->lock, flags);
1458
1459 if (dev->driver)
1460 s = dev->driver->driver.name;
1461 else
1462 s = "(none)";
1463
1464 /* Main Control Registers */
1465 t = scnprintf (next, size, "%s version " DRIVER_VERSION
1466 ", chiprev %04x, dma %s\n\n"
1467 "devinit %03x fifoctl %08x gadget '%s'\n"
1468 "pci irqenb0 %02x irqenb1 %08x "
1469 "irqstat0 %04x irqstat1 %08x\n",
1470 driver_name, dev->chiprev,
1471 use_dma
1472 ? (use_dma_chaining ? "chaining" : "enabled")
1473 : "disabled",
1474 readl (&dev->regs->devinit),
1475 readl (&dev->regs->fifoctl),
1476 s,
1477 readl (&dev->regs->pciirqenb0),
1478 readl (&dev->regs->pciirqenb1),
1479 readl (&dev->regs->irqstat0),
1480 readl (&dev->regs->irqstat1));
1481 size -= t;
1482 next += t;
1483
1484 /* USB Control Registers */
1485 t1 = readl (&dev->usb->usbctl);
1486 t2 = readl (&dev->usb->usbstat);
1487 if (t1 & (1 << VBUS_PIN)) {
1488 if (t2 & (1 << HIGH_SPEED))
1489 s = "high speed";
1490 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1491 s = "powered";
1492 else
1493 s = "full speed";
1494 /* full speed bit (6) not working?? */
1495 } else
1496 s = "not attached";
1497 t = scnprintf (next, size,
1498 "stdrsp %08x usbctl %08x usbstat %08x "
1499 "addr 0x%02x (%s)\n",
1500 readl (&dev->usb->stdrsp), t1, t2,
1501 readl (&dev->usb->ouraddr), s);
1502 size -= t;
1503 next += t;
1504
1505 /* PCI Master Control Registers */
1506
1507 /* DMA Control Registers */
1508
1509 /* Configurable EP Control Registers */
1510 for (i = 0; i < 7; i++) {
1511 struct net2280_ep *ep;
1512
1513 ep = &dev->ep [i];
1514 if (i && !ep->desc)
1515 continue;
1516
1517 t1 = readl (&ep->regs->ep_cfg);
1518 t2 = readl (&ep->regs->ep_rsp) & 0xff;
1519 t = scnprintf (next, size,
1520 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1521 "irqenb %02x\n",
1522 ep->ep.name, t1, t2,
1523 (t2 & (1 << CLEAR_NAK_OUT_PACKETS))
1524 ? "NAK " : "",
1525 (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE))
1526 ? "hide " : "",
1527 (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR))
1528 ? "CRC " : "",
1529 (t2 & (1 << CLEAR_INTERRUPT_MODE))
1530 ? "interrupt " : "",
1531 (t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1532 ? "status " : "",
1533 (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE))
1534 ? "NAKmode " : "",
1535 (t2 & (1 << CLEAR_ENDPOINT_TOGGLE))
1536 ? "DATA1 " : "DATA0 ",
1537 (t2 & (1 << CLEAR_ENDPOINT_HALT))
1538 ? "HALT " : "",
1539 readl (&ep->regs->ep_irqenb));
1540 size -= t;
1541 next += t;
1542
1543 t = scnprintf (next, size,
1544 "\tstat %08x avail %04x "
1545 "(ep%d%s-%s)%s\n",
1546 readl (&ep->regs->ep_stat),
1547 readl (&ep->regs->ep_avail),
1548 t1 & 0x0f, DIR_STRING (t1),
1549 type_string (t1 >> 8),
1550 ep->stopped ? "*" : "");
1551 size -= t;
1552 next += t;
1553
1554 if (!ep->dma)
1555 continue;
1556
1557 t = scnprintf (next, size,
1558 " dma\tctl %08x stat %08x count %08x\n"
1559 "\taddr %08x desc %08x\n",
1560 readl (&ep->dma->dmactl),
1561 readl (&ep->dma->dmastat),
1562 readl (&ep->dma->dmacount),
1563 readl (&ep->dma->dmaaddr),
1564 readl (&ep->dma->dmadesc));
1565 size -= t;
1566 next += t;
1567
1568 }
1569
1570 /* Indexed Registers */
901b3d75 1571 // none yet
1da177e4
LT		 1572
1573 /* Statistics */
1574 t = scnprintf (next, size, "\nirqs: ");
1575 size -= t;
1576 next += t;
1577 for (i = 0; i < 7; i++) {
1578 struct net2280_ep *ep;
1579
1580 ep = &dev->ep [i];
1581 if (i && !ep->irqs)
1582 continue;
1583 t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs);
1584 size -= t;
1585 next += t;
1586
1587 }
1588 t = scnprintf (next, size, "\n");
1589 size -= t;
1590 next += t;
1591
1592 spin_unlock_irqrestore (&dev->lock, flags);
1593
1594 return PAGE_SIZE - size;
1595}
62fb44b9 1596static DEVICE_ATTR(registers, S_IRUGO, net2280_show_registers, NULL);
1da177e4
LT		 1597
1598static ssize_t
10523b3b 1599show_queues (struct device *_dev, struct device_attribute *attr, char *buf)
1da177e4
LT		 1600{
1601 struct net2280 *dev;
1602 char *next;
1603 unsigned size;
1604 unsigned long flags;
1605 int i;
1606
1607 dev = dev_get_drvdata (_dev);
1608 next = buf;
1609 size = PAGE_SIZE;
1610 spin_lock_irqsave (&dev->lock, flags);
1611
1612 for (i = 0; i < 7; i++) {
1613 struct net2280_ep *ep = &dev->ep [i];
1614 struct net2280_request *req;
1615 int t;
1616
1617 if (i != 0) {
1618 const struct usb_endpoint_descriptor *d;
1619
1620 d = ep->desc;
1621 if (!d)
1622 continue;
1623 t = d->bEndpointAddress;
1624 t = scnprintf (next, size,
1625 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1626 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1627 (t & USB_DIR_IN) ? "in" : "out",
1628 ({ char *val;
1629 switch (d->bmAttributes & 0x03) {
1630 case USB_ENDPOINT_XFER_BULK:
901b3d75 1631 val = "bulk"; break;
1da177e4 1632 case USB_ENDPOINT_XFER_INT:
901b3d75 1633 val = "intr"; break;
1da177e4 1634 default:
901b3d75 1635 val = "iso"; break;
1da177e4 1636 }; val; }),
29cc8897 1637 usb_endpoint_maxp (d) & 0x1fff,
1da177e4
LT		 1638 ep->dma ? "dma" : "pio", ep->fifo_size
1639 );
1640 } else /* ep0 should only have one transfer queued */
1641 t = scnprintf (next, size, "ep0 max 64 pio %s\n",
1642 ep->is_in ? "in" : "out");
1643 if (t <= 0 || t > size)
1644 goto done;
1645 size -= t;
1646 next += t;
1647
1648 if (list_empty (&ep->queue)) {
1649 t = scnprintf (next, size, "\t(nothing queued)\n");
1650 if (t <= 0 || t > size)
1651 goto done;
1652 size -= t;
1653 next += t;
1654 continue;
1655 }
1656 list_for_each_entry (req, &ep->queue, queue) {
1657 if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc))
1658 t = scnprintf (next, size,
1659 "\treq %p len %d/%d "
1660 "buf %p (dmacount %08x)\n",
1661 &req->req, req->req.actual,
1662 req->req.length, req->req.buf,
1663 readl (&ep->dma->dmacount));
1664 else
1665 t = scnprintf (next, size,
1666 "\treq %p len %d/%d buf %p\n",
1667 &req->req, req->req.actual,
1668 req->req.length, req->req.buf);
1669 if (t <= 0 || t > size)
1670 goto done;
1671 size -= t;
1672 next += t;
1673
1674 if (ep->dma) {
1675 struct net2280_dma *td;
1676
1677 td = req->td;
1678 t = scnprintf (next, size, "\t td %08x "
1679 " count %08x buf %08x desc %08x\n",
1680 (u32) req->td_dma,
1681 le32_to_cpu (td->dmacount),
1682 le32_to_cpu (td->dmaaddr),
1683 le32_to_cpu (td->dmadesc));
1684 if (t <= 0 || t > size)
1685 goto done;
1686 size -= t;
1687 next += t;
1688 }
1689 }
1690 }
1691
1692done:
1693 spin_unlock_irqrestore (&dev->lock, flags);
1694 return PAGE_SIZE - size;
1695}
1696static DEVICE_ATTR (queues, S_IRUGO, show_queues, NULL);
1697
1698
1699#else
1700
9950421c
LT		 1701#define device_create_file(a,b) (0)
1702#define device_remove_file(a,b) do { } while (0)
1da177e4
LT		 1703
1704#endif
1705
1706/*-------------------------------------------------------------------------*/
1707
1708/* another driver-specific mode might be a request type doing dma
1709 * to/from another device fifo instead of to/from memory.
1710 */
1711
1712static void set_fifo_mode (struct net2280 *dev, int mode)
1713{
1714 /* keeping high bits preserves BAR2 */
1715 writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1716
1717 /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1718 INIT_LIST_HEAD (&dev->gadget.ep_list);
1719 list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list);
1720 list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list);
1721 switch (mode) {
1722 case 0:
1723 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1724 list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list);
1725 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024;
1726 break;
1727 case 1:
1728 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048;
1729 break;
1730 case 2:
1731 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1732 dev->ep [1].fifo_size = 2048;
1733 dev->ep [2].fifo_size = 1024;
1734 break;
1735 }
1736 /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1737 list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list);
1738 list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list);
1739}
1740
1da177e4
LT		 1741/* keeping it simple:
1742 * - one bus driver, initted first;
1743 * - one function driver, initted second
1744 *
1745 * most of the work to support multiple net2280 controllers would
1746 * be to associate this gadget driver (yes?) with all of them, or
1747 * perhaps to bind specific drivers to specific devices.
1748 */
1749
1da177e4
LT		 1750static void usb_reset (struct net2280 *dev)
1751{
1752 u32 tmp;
1753
1754 dev->gadget.speed = USB_SPEED_UNKNOWN;
1755 (void) readl (&dev->usb->usbctl);
1756
1757 net2280_led_init (dev);
1758
1759 /* disable automatic responses, and irqs */
1760 writel (0, &dev->usb->stdrsp);
1761 writel (0, &dev->regs->pciirqenb0);
1762 writel (0, &dev->regs->pciirqenb1);
1763
1764 /* clear old dma and irq state */
1765 for (tmp = 0; tmp < 4; tmp++) {
1766 struct net2280_ep *ep = &dev->ep [tmp + 1];
1767
1768 if (ep->dma)
1769 abort_dma (ep);
1770 }
1771 writel (~0, &dev->regs->irqstat0),
1772 writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
1773
1774 /* reset, and enable pci */
1775 tmp = readl (&dev->regs->devinit)
1776 | (1 << PCI_ENABLE)
1777 | (1 << FIFO_SOFT_RESET)
1778 | (1 << USB_SOFT_RESET)
1779 | (1 << M8051_RESET);
1780 writel (tmp, &dev->regs->devinit);
1781
1782 /* standard fifo and endpoint allocations */
1783 set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0);
1784}
1785
1786static void usb_reinit (struct net2280 *dev)
1787{
1788 u32 tmp;
1789 int init_dma;
1790
1791 /* use_dma changes are ignored till next device re-init */
1792 init_dma = use_dma;
1793
1794 /* basic endpoint init */
1795 for (tmp = 0; tmp < 7; tmp++) {
1796 struct net2280_ep *ep = &dev->ep [tmp];
1797
1798 ep->ep.name = ep_name [tmp];
1799 ep->dev = dev;
1800 ep->num = tmp;
1801
1802 if (tmp > 0 && tmp <= 4) {
1803 ep->fifo_size = 1024;
1804 if (init_dma)
1805 ep->dma = &dev->dma [tmp - 1];
1806 } else
1807 ep->fifo_size = 64;
1808 ep->regs = &dev->epregs [tmp];
1809 ep_reset (dev->regs, ep);
1810 }
1811 dev->ep [0].ep.maxpacket = 64;
1812 dev->ep [5].ep.maxpacket = 64;
1813 dev->ep [6].ep.maxpacket = 64;
1814
1815 dev->gadget.ep0 = &dev->ep [0].ep;
1816 dev->ep [0].stopped = 0;
1817 INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1818
1819 /* we want to prevent lowlevel/insecure access from the USB host,
1820 * but erratum 0119 means this enable bit is ignored
1821 */
1822 for (tmp = 0; tmp < 5; tmp++)
1823 writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg);
1824}
1825
1826static void ep0_start (struct net2280 *dev)
1827{
1828 writel ( (1 << CLEAR_EP_HIDE_STATUS_PHASE)
1829 | (1 << CLEAR_NAK_OUT_PACKETS)
1830 | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
1831 , &dev->epregs [0].ep_rsp);
1832
1833 /*
1834 * hardware optionally handles a bunch of standard requests
1835 * that the API hides from drivers anyway. have it do so.
1836 * endpoint status/features are handled in software, to
1837 * help pass tests for some dubious behavior.
1838 */
1839 writel ( (1 << SET_TEST_MODE)
1840 | (1 << SET_ADDRESS)
1841 | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP)
1842 | (1 << GET_DEVICE_STATUS)
1843 | (1 << GET_INTERFACE_STATUS)
1844 , &dev->usb->stdrsp);
1845 writel ( (1 << USB_ROOT_PORT_WAKEUP_ENABLE)
1846 | (1 << SELF_POWERED_USB_DEVICE)
1847 | (1 << REMOTE_WAKEUP_SUPPORT)
1848 | (dev->softconnect << USB_DETECT_ENABLE)
1849 | (1 << SELF_POWERED_STATUS)
1850 , &dev->usb->usbctl);
1851
1852 /* enable irqs so we can see ep0 and general operation */
1853 writel ( (1 << SETUP_PACKET_INTERRUPT_ENABLE)
1854 | (1 << ENDPOINT_0_INTERRUPT_ENABLE)
1855 , &dev->regs->pciirqenb0);
1856 writel ( (1 << PCI_INTERRUPT_ENABLE)
1857 | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE)
1858 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE)
1859 | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE)
1860 | (1 << VBUS_INTERRUPT_ENABLE)
1861 | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE)
1862 | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE)
1863 , &dev->regs->pciirqenb1);
1864
1865 /* don't leave any writes posted */
1866 (void) readl (&dev->usb->usbctl);
1867}
1868
1869/* when a driver is successfully registered, it will receive
1870 * control requests including set_configuration(), which enables
1871 * non-control requests. then usb traffic follows until a
1872 * disconnect is reported. then a host may connect again, or
1873 * the driver might get unbound.
1874 */
4cf5e00b
FB		 1875static int net2280_start(struct usb_gadget *_gadget,
1876 struct usb_gadget_driver *driver)
1da177e4 1877{
4cf5e00b 1878 struct net2280 *dev;
1da177e4
LT		 1879 int retval;
1880 unsigned i;
1881
1882 /* insist on high speed support from the driver, since
1883 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
1884 * "must not be used in normal operation"
1885 */
7177aed4 1886 if (!driver || driver->max_speed < USB_SPEED_HIGH
4cf5e00b 1887 || !driver->setup)
1da177e4 1888 return -EINVAL;
4cf5e00b
FB		 1889
1890 dev = container_of (_gadget, struct net2280, gadget);
1da177e4
LT		 1891
1892 for (i = 0; i < 7; i++)
1893 dev->ep [i].irqs = 0;
1894
1895 /* hook up the driver ... */
1896 dev->softconnect = 1;
1897 driver->driver.bus = NULL;
1898 dev->driver = driver;
1899 dev->gadget.dev.driver = &driver->driver;
1da177e4 1900
b3899dac
JG		 1901 retval = device_create_file (&dev->pdev->dev, &dev_attr_function);
1902 if (retval) goto err_unbind;
1903 retval = device_create_file (&dev->pdev->dev, &dev_attr_queues);
1904 if (retval) goto err_func;
1da177e4 1905
2f076077
AS		 1906 /* Enable force-full-speed testing mode, if desired */
1907 if (full_speed)
1908 writel(1 << FORCE_FULL_SPEED_MODE, &dev->usb->xcvrdiag);
1909
1da177e4
LT		 1910 /* ... then enable host detection and ep0; and we're ready
1911 * for set_configuration as well as eventual disconnect.
1912 */
1913 net2280_led_active (dev, 1);
1914 ep0_start (dev);
1915
1916 DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n",
1917 driver->driver.name,
1918 readl (&dev->usb->usbctl),
1919 readl (&dev->usb->stdrsp));
1920
1921 /* pci writes may still be posted */
1922 return 0;
b3899dac
JG		 1923
1924err_func:
1925 device_remove_file (&dev->pdev->dev, &dev_attr_function);
1926err_unbind:
b3899dac
JG		 1927 dev->gadget.dev.driver = NULL;
1928 dev->driver = NULL;
1929 return retval;
1da177e4 1930}
1da177e4
LT		 1931
1932static void
1933stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver)
1934{
1935 int i;
1936
1937 /* don't disconnect if it's not connected */
1938 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1939 driver = NULL;
1940
1941 /* stop hardware; prevent new request submissions;
1942 * and kill any outstanding requests.
1943 */
1944 usb_reset (dev);
1945 for (i = 0; i < 7; i++)
1946 nuke (&dev->ep [i]);
1947
699412d9
FB		 1948 /* report disconnect; the driver is already quiesced */
1949 if (driver) {
1950 spin_unlock(&dev->lock);
1951 driver->disconnect(&dev->gadget);
1952 spin_lock(&dev->lock);
1953 }
1954
1da177e4
LT		 1955 usb_reinit (dev);
1956}
1957
4cf5e00b
FB		 1958static int net2280_stop(struct usb_gadget *_gadget,
1959 struct usb_gadget_driver *driver)
1da177e4 1960{
4cf5e00b 1961 struct net2280 *dev;
1da177e4
LT		 1962 unsigned long flags;
1963
4cf5e00b 1964 dev = container_of (_gadget, struct net2280, gadget);
1da177e4
LT		 1965
1966 spin_lock_irqsave (&dev->lock, flags);
1967 stop_activity (dev, driver);
1968 spin_unlock_irqrestore (&dev->lock, flags);
1969
1da177e4
LT		 1970 dev->gadget.dev.driver = NULL;
1971 dev->driver = NULL;
1972
1973 net2280_led_active (dev, 0);
2f076077
AS		 1974
1975 /* Disable full-speed test mode */
1976 writel(0, &dev->usb->xcvrdiag);
1977
1da177e4
LT		 1978 device_remove_file (&dev->pdev->dev, &dev_attr_function);
1979 device_remove_file (&dev->pdev->dev, &dev_attr_queues);
1980
1981 DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name);
1982 return 0;
1983}
1da177e4
LT		 1984
1985/*-------------------------------------------------------------------------*/
1986
1987/* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
1988 * also works for dma-capable endpoints, in pio mode or just
1989 * to manually advance the queue after short OUT transfers.
1990 */
1991static void handle_ep_small (struct net2280_ep *ep)
1992{
1993 struct net2280_request *req;
1994 u32 t;
1995 /* 0 error, 1 mid-data, 2 done */
1996 int mode = 1;
1997
1998 if (!list_empty (&ep->queue))
1999 req = list_entry (ep->queue.next,
2000 struct net2280_request, queue);
2001 else
2002 req = NULL;
2003
2004 /* ack all, and handle what we care about */
2005 t = readl (&ep->regs->ep_stat);
2006 ep->irqs++;
2007#if 0
2008 VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n",
2009 ep->ep.name, t, req ? &req->req : 0);
2010#endif
950ee4c8
GL		 2011 if (!ep->is_in || ep->dev->pdev->device == 0x2280)
2012 writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat);
2013 else
2014 /* Added for 2282 */
2015 writel (t, &ep->regs->ep_stat);
1da177e4
LT		 2016
2017 /* for ep0, monitor token irqs to catch data stage length errors
2018 * and to synchronize on status.
2019 *
2020 * also, to defer reporting of protocol stalls ... here's where
2021 * data or status first appears, handling stalls here should never
2022 * cause trouble on the host side..
2023 *
2024 * control requests could be slightly faster without token synch for
2025 * status, but status can jam up that way.
2026 */
2027 if (unlikely (ep->num == 0)) {
2028 if (ep->is_in) {
2029 /* status; stop NAKing */
2030 if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) {
2031 if (ep->dev->protocol_stall) {
2032 ep->stopped = 1;
2033 set_halt (ep);
2034 }
2035 if (!req)
2036 allow_status (ep);
2037 mode = 2;
2038 /* reply to extra IN data tokens with a zlp */
2039 } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2040 if (ep->dev->protocol_stall) {
2041 ep->stopped = 1;
2042 set_halt (ep);
2043 mode = 2;
1f26e28d
AS		 2044 } else if (ep->responded &&
2045 !req && !ep->stopped)
1da177e4
LT		 2046 write_fifo (ep, NULL);
2047 }
2048 } else {
2049 /* status; stop NAKing */
2050 if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2051 if (ep->dev->protocol_stall) {
2052 ep->stopped = 1;
2053 set_halt (ep);
2054 }
2055 mode = 2;
2056 /* an extra OUT token is an error */
2057 } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT))
2058 && req
2059 && req->req.actual == req->req.length)
1f26e28d 2060 || (ep->responded && !req)) {
1da177e4
LT		 2061 ep->dev->protocol_stall = 1;
2062 set_halt (ep);
2063 ep->stopped = 1;
2064 if (req)
2065 done (ep, req, -EOVERFLOW);
2066 req = NULL;
2067 }
2068 }
2069 }
2070
2071 if (unlikely (!req))
2072 return;
2073
2074 /* manual DMA queue advance after short OUT */
2075 if (likely (ep->dma != 0)) {
2076 if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2077 u32 count;
2078 int stopped = ep->stopped;
2079
2080 /* TRANSFERRED works around OUT_DONE erratum 0112.
2081 * we expect (N <= maxpacket) bytes; host wrote M.
2082 * iff (M < N) we won't ever see a DMA interrupt.
2083 */
2084 ep->stopped = 1;
2085 for (count = 0; ; t = readl (&ep->regs->ep_stat)) {
2086
2087 /* any preceding dma transfers must finish.
2088 * dma handles (M >= N), may empty the queue
2089 */
2090 scan_dma_completions (ep);
2091 if (unlikely (list_empty (&ep->queue)
2092 || ep->out_overflow)) {
2093 req = NULL;
2094 break;
2095 }
2096 req = list_entry (ep->queue.next,
2097 struct net2280_request, queue);
2098
2099 /* here either (M < N), a "real" short rx;
2100 * or (M == N) and the queue didn't empty
2101 */
2102 if (likely (t & (1 << FIFO_EMPTY))) {
2103 count = readl (&ep->dma->dmacount);
2104 count &= DMA_BYTE_COUNT_MASK;
2105 if (readl (&ep->dma->dmadesc)
2106 != req->td_dma)
2107 req = NULL;
2108 break;
2109 }
2110 udelay(1);
2111 }
2112
2113 /* stop DMA, leave ep NAKing */
2114 writel ((1 << DMA_ABORT), &ep->dma->dmastat);
2115 spin_stop_dma (ep->dma);
2116
2117 if (likely (req)) {
2118 req->td->dmacount = 0;
2119 t = readl (&ep->regs->ep_avail);
68dcc688 2120 dma_done (ep, req, count,
901b3d75
DB		 2121 (ep->out_overflow || t)
2122 ? -EOVERFLOW : 0);
1da177e4
LT		 2123 }
2124
2125 /* also flush to prevent erratum 0106 trouble */
2126 if (unlikely (ep->out_overflow
2127 || (ep->dev->chiprev == 0x0100
2128 && ep->dev->gadget.speed
2129 == USB_SPEED_FULL))) {
2130 out_flush (ep);
2131 ep->out_overflow = 0;
2132 }
2133
2134 /* (re)start dma if needed, stop NAKing */
2135 ep->stopped = stopped;
2136 if (!list_empty (&ep->queue))
2137 restart_dma (ep);
2138 } else
2139 DEBUG (ep->dev, "%s dma ep_stat %08x ??\n",
2140 ep->ep.name, t);
2141 return;
2142
2143 /* data packet(s) received (in the fifo, OUT) */
2144 } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) {
2145 if (read_fifo (ep, req) && ep->num != 0)
2146 mode = 2;
2147
2148 /* data packet(s) transmitted (IN) */
2149 } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2150 unsigned len;
2151
2152 len = req->req.length - req->req.actual;
2153 if (len > ep->ep.maxpacket)
2154 len = ep->ep.maxpacket;
2155 req->req.actual += len;
2156
2157 /* if we wrote it all, we're usually done */
2158 if (req->req.actual == req->req.length) {
2159 if (ep->num == 0) {
317e83b8 2160 /* send zlps until the status stage */
1da177e4
LT		 2161 } else if (!req->req.zero || len != ep->ep.maxpacket)
2162 mode = 2;
2163 }
2164
2165 /* there was nothing to do ... */
2166 } else if (mode == 1)
2167 return;
2168
2169 /* done */
2170 if (mode == 2) {
2171 /* stream endpoints often resubmit/unlink in completion */
2172 done (ep, req, 0);
2173
2174 /* maybe advance queue to next request */
2175 if (ep->num == 0) {
2176 /* NOTE: net2280 could let gadget driver start the
2177 * status stage later. since not all controllers let
2178 * them control that, the api doesn't (yet) allow it.
2179 */
2180 if (!ep->stopped)
2181 allow_status (ep);
2182 req = NULL;
2183 } else {
2184 if (!list_empty (&ep->queue) && !ep->stopped)
2185 req = list_entry (ep->queue.next,
2186 struct net2280_request, queue);
2187 else
2188 req = NULL;
2189 if (req && !ep->is_in)
2190 stop_out_naking (ep);
2191 }
2192 }
2193
2194 /* is there a buffer for the next packet?
2195 * for best streaming performance, make sure there is one.
2196 */
2197 if (req && !ep->stopped) {
2198
2199 /* load IN fifo with next packet (may be zlp) */
2200 if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT))
2201 write_fifo (ep, &req->req);
2202 }
2203}
2204
2205static struct net2280_ep *
2206get_ep_by_addr (struct net2280 *dev, u16 wIndex)
2207{
2208 struct net2280_ep *ep;
2209
2210 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2211 return &dev->ep [0];
2212 list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) {
2213 u8 bEndpointAddress;
2214
2215 if (!ep->desc)
2216 continue;
2217 bEndpointAddress = ep->desc->bEndpointAddress;
2218 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2219 continue;
2220 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2221 return ep;
2222 }
2223 return NULL;
2224}
2225
2226static void handle_stat0_irqs (struct net2280 *dev, u32 stat)
2227{
2228 struct net2280_ep *ep;
2229 u32 num, scratch;
2230
2231 /* most of these don't need individual acks */
2232 stat &= ~(1 << INTA_ASSERTED);
2233 if (!stat)
2234 return;
2235 // DEBUG (dev, "irqstat0 %04x\n", stat);
2236
2237 /* starting a control request? */
2238 if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) {
2239 union {
2240 u32 raw [2];
2241 struct usb_ctrlrequest r;
2242 } u;
950ee4c8 2243 int tmp;
1da177e4
LT		 2244 struct net2280_request *req;
2245
2246 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
2247 if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED))
2248 dev->gadget.speed = USB_SPEED_HIGH;
2249 else
2250 dev->gadget.speed = USB_SPEED_FULL;
2251 net2280_led_speed (dev, dev->gadget.speed);
e538dfda 2252 DEBUG(dev, "%s\n", usb_speed_string(dev->gadget.speed));
1da177e4
LT		 2253 }
2254
2255 ep = &dev->ep [0];
2256 ep->irqs++;
2257
2258 /* make sure any leftover request state is cleared */
2259 stat &= ~(1 << ENDPOINT_0_INTERRUPT);
2260 while (!list_empty (&ep->queue)) {
2261 req = list_entry (ep->queue.next,
2262 struct net2280_request, queue);
2263 done (ep, req, (req->req.actual == req->req.length)
2264 ? 0 : -EPROTO);
2265 }
2266 ep->stopped = 0;
2267 dev->protocol_stall = 0;
950ee4c8
GL		 2268
2269 if (ep->dev->pdev->device == 0x2280)
2270 tmp = (1 << FIFO_OVERFLOW)
2271 | (1 << FIFO_UNDERFLOW);
2272 else
2273 tmp = 0;
2274
2275 writel (tmp | (1 << TIMEOUT)
1da177e4
LT		 2276 | (1 << USB_STALL_SENT)
2277 | (1 << USB_IN_NAK_SENT)
2278 | (1 << USB_IN_ACK_RCVD)
2279 | (1 << USB_OUT_PING_NAK_SENT)
2280 | (1 << USB_OUT_ACK_SENT)
1da177e4
LT		 2281 | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
2282 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
2283 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2284 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2285 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2286 | (1 << DATA_IN_TOKEN_INTERRUPT)
2287 , &ep->regs->ep_stat);
2288 u.raw [0] = readl (&dev->usb->setup0123);
2289 u.raw [1] = readl (&dev->usb->setup4567);
901b3d75 2290
1da177e4
LT		 2291 cpu_to_le32s (&u.raw [0]);
2292 cpu_to_le32s (&u.raw [1]);
2293
950ee4c8
GL		 2294 tmp = 0;
2295
01ee7d70
DB		 2296#define w_value le16_to_cpu(u.r.wValue)
2297#define w_index le16_to_cpu(u.r.wIndex)
2298#define w_length le16_to_cpu(u.r.wLength)
1da177e4
LT		 2299
2300 /* ack the irq */
2301 writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0);
2302 stat ^= (1 << SETUP_PACKET_INTERRUPT);
2303
2304 /* watch control traffic at the token level, and force
2305 * synchronization before letting the status stage happen.
2306 * FIXME ignore tokens we'll NAK, until driver responds.
2307 * that'll mean a lot less irqs for some drivers.
2308 */
2309 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
2310 if (ep->is_in) {
2311 scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2312 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2313 | (1 << DATA_IN_TOKEN_INTERRUPT);
2314 stop_out_naking (ep);
2315 } else
2316 scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2317 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2318 | (1 << DATA_IN_TOKEN_INTERRUPT);
2319 writel (scratch, &dev->epregs [0].ep_irqenb);
2320
2321 /* we made the hardware handle most lowlevel requests;
2322 * everything else goes uplevel to the gadget code.
2323 */
1f26e28d 2324 ep->responded = 1;
1da177e4
LT		 2325 switch (u.r.bRequest) {
2326 case USB_REQ_GET_STATUS: {
2327 struct net2280_ep *e;
320f3459 2328 __le32 status;
1da177e4
LT		 2329
2330 /* hw handles device and interface status */
2331 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
2332 goto delegate;
320f3459
DB		 2333 if ((e = get_ep_by_addr (dev, w_index)) == 0
2334 || w_length > 2)
1da177e4
LT		 2335 goto do_stall;
2336
2337 if (readl (&e->regs->ep_rsp)
2338 & (1 << SET_ENDPOINT_HALT))
551509d2 2339 status = cpu_to_le32 (1);
1da177e4 2340 else
551509d2 2341 status = cpu_to_le32 (0);
1da177e4
LT		 2342
2343 /* don't bother with a request object! */
2344 writel (0, &dev->epregs [0].ep_irqenb);
320f3459
DB		 2345 set_fifo_bytecount (ep, w_length);
2346 writel ((__force u32)status, &dev->epregs [0].ep_data);
1da177e4
LT		 2347 allow_status (ep);
2348 VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status);
2349 goto next_endpoints;
2350 }
2351 break;
2352 case USB_REQ_CLEAR_FEATURE: {
2353 struct net2280_ep *e;
2354
2355 /* hw handles device features */
2356 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2357 goto delegate;
320f3459
DB		 2358 if (w_value != USB_ENDPOINT_HALT
2359 || w_length != 0)
1da177e4 2360 goto do_stall;
320f3459 2361 if ((e = get_ep_by_addr (dev, w_index)) == 0)
1da177e4 2362 goto do_stall;
8066134f
AS		 2363 if (e->wedged) {
2364 VDEBUG(dev, "%s wedged, halt not cleared\n",
2365 ep->ep.name);
2366 } else {
2367 VDEBUG(dev, "%s clear halt\n", ep->ep.name);
2368 clear_halt(e);
2369 }
1da177e4 2370 allow_status (ep);
1da177e4
LT		 2371 goto next_endpoints;
2372 }
2373 break;
2374 case USB_REQ_SET_FEATURE: {
2375 struct net2280_ep *e;
2376
2377 /* hw handles device features */
2378 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2379 goto delegate;
320f3459
DB		 2380 if (w_value != USB_ENDPOINT_HALT
2381 || w_length != 0)
1da177e4 2382 goto do_stall;
320f3459 2383 if ((e = get_ep_by_addr (dev, w_index)) == 0)
1da177e4 2384 goto do_stall;
8066134f
AS		 2385 if (e->ep.name == ep0name)
2386 goto do_stall;
1da177e4
LT		 2387 set_halt (e);
2388 allow_status (ep);
2389 VDEBUG (dev, "%s set halt\n", ep->ep.name);
2390 goto next_endpoints;
2391 }
2392 break;
2393 default:
2394delegate:
fec8de3a 2395 VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x "
1da177e4
LT		 2396 "ep_cfg %08x\n",
2397 u.r.bRequestType, u.r.bRequest,
320f3459 2398 w_value, w_index, w_length,
1da177e4 2399 readl (&ep->regs->ep_cfg));
1f26e28d 2400 ep->responded = 0;
1da177e4
LT		 2401 spin_unlock (&dev->lock);
2402 tmp = dev->driver->setup (&dev->gadget, &u.r);
2403 spin_lock (&dev->lock);
2404 }
2405
2406 /* stall ep0 on error */
2407 if (tmp < 0) {
2408do_stall:
2409 VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n",
2410 u.r.bRequestType, u.r.bRequest, tmp);
2411 dev->protocol_stall = 1;
2412 }
2413
2414 /* some in/out token irq should follow; maybe stall then.
2415 * driver must queue a request (even zlp) or halt ep0
2416 * before the host times out.
2417 */
2418 }
2419
320f3459
DB		 2420#undef w_value
2421#undef w_index
2422#undef w_length
2423
1da177e4
LT		 2424next_endpoints:
2425 /* endpoint data irq ? */
2426 scratch = stat & 0x7f;
2427 stat &= ~0x7f;
2428 for (num = 0; scratch; num++) {
2429 u32 t;
2430
2431 /* do this endpoint's FIFO and queue need tending? */
2432 t = 1 << num;
2433 if ((scratch & t) == 0)
2434 continue;
2435 scratch ^= t;
2436
2437 ep = &dev->ep [num];
2438 handle_ep_small (ep);
2439 }
2440
2441 if (stat)
2442 DEBUG (dev, "unhandled irqstat0 %08x\n", stat);
2443}
2444
2445#define DMA_INTERRUPTS ( \
2446 (1 << DMA_D_INTERRUPT) \
2447 | (1 << DMA_C_INTERRUPT) \
2448 | (1 << DMA_B_INTERRUPT) \
2449 | (1 << DMA_A_INTERRUPT))
2450#define PCI_ERROR_INTERRUPTS ( \
2451 (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \
2452 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \
2453 | (1 << PCI_RETRY_ABORT_INTERRUPT))
2454
2455static void handle_stat1_irqs (struct net2280 *dev, u32 stat)
2456{
2457 struct net2280_ep *ep;
2458 u32 tmp, num, mask, scratch;
2459
2460 /* after disconnect there's nothing else to do! */
2461 tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT);
2462 mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED);
2463
2464 /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
fb914ebf 2465 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
901b3d75 2466 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
1da177e4
LT		 2467 * only indicates a change in the reset state).
2468 */
2469 if (stat & tmp) {
2470 writel (tmp, &dev->regs->irqstat1);
901b3d75
DB		 2471 if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT))
2472 && ((readl (&dev->usb->usbstat) & mask)
2473 == 0))
2474 || ((readl (&dev->usb->usbctl)
2475 & (1 << VBUS_PIN)) == 0)
1da177e4
LT		 2476 ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) {
2477 DEBUG (dev, "disconnect %s\n",
2478 dev->driver->driver.name);
2479 stop_activity (dev, dev->driver);
2480 ep0_start (dev);
2481 return;
2482 }
2483 stat &= ~tmp;
2484
2485 /* vBUS can bounce ... one of many reasons to ignore the
2486 * notion of hotplug events on bus connect/disconnect!
2487 */
2488 if (!stat)
2489 return;
2490 }
2491
2492 /* NOTE: chip stays in PCI D0 state for now, but it could
2493 * enter D1 to save more power
2494 */
2495 tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT);
2496 if (stat & tmp) {
2497 writel (tmp, &dev->regs->irqstat1);
2498 if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) {
2499 if (dev->driver->suspend)
2500 dev->driver->suspend (&dev->gadget);
2501 if (!enable_suspend)
2502 stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT);
2503 } else {
2504 if (dev->driver->resume)
2505 dev->driver->resume (&dev->gadget);
2506 /* at high speed, note erratum 0133 */
2507 }
2508 stat &= ~tmp;
2509 }
2510
2511 /* clear any other status/irqs */
2512 if (stat)
2513 writel (stat, &dev->regs->irqstat1);
2514
2515 /* some status we can just ignore */
950ee4c8
GL		 2516 if (dev->pdev->device == 0x2280)
2517 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2518 | (1 << SUSPEND_REQUEST_INTERRUPT)
2519 | (1 << RESUME_INTERRUPT)
2520 | (1 << SOF_INTERRUPT));
2521 else
2522 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2523 | (1 << RESUME_INTERRUPT)
2524 | (1 << SOF_DOWN_INTERRUPT)
2525 | (1 << SOF_INTERRUPT));
2526
1da177e4
LT		 2527 if (!stat)
2528 return;
2529 // DEBUG (dev, "irqstat1 %08x\n", stat);
2530
2531 /* DMA status, for ep-{a,b,c,d} */
2532 scratch = stat & DMA_INTERRUPTS;
2533 stat &= ~DMA_INTERRUPTS;
2534 scratch >>= 9;
2535 for (num = 0; scratch; num++) {
2536 struct net2280_dma_regs __iomem *dma;
2537
2538 tmp = 1 << num;
2539 if ((tmp & scratch) == 0)
2540 continue;
2541 scratch ^= tmp;
2542
2543 ep = &dev->ep [num + 1];
2544 dma = ep->dma;
2545
2546 if (!dma)
2547 continue;
2548
2549 /* clear ep's dma status */
2550 tmp = readl (&dma->dmastat);
2551 writel (tmp, &dma->dmastat);
2552
2553 /* chaining should stop on abort, short OUT from fifo,
2554 * or (stat0 codepath) short OUT transfer.
2555 */
2556 if (!use_dma_chaining) {
2557 if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT))
2558 == 0) {
2559 DEBUG (ep->dev, "%s no xact done? %08x\n",
2560 ep->ep.name, tmp);
2561 continue;
2562 }
2563 stop_dma (ep->dma);
2564 }
2565
2566 /* OUT transfers terminate when the data from the
2567 * host is in our memory. Process whatever's done.
2568 * On this path, we know transfer's last packet wasn't
2569 * less than req->length. NAK_OUT_PACKETS may be set,
2570 * or the FIFO may already be holding new packets.
2571 *
2572 * IN transfers can linger in the FIFO for a very
2573 * long time ... we ignore that for now, accounting
2574 * precisely (like PIO does) needs per-packet irqs
2575 */
2576 scan_dma_completions (ep);
2577
2578 /* disable dma on inactive queues; else maybe restart */
2579 if (list_empty (&ep->queue)) {
2580 if (use_dma_chaining)
2581 stop_dma (ep->dma);
2582 } else {
2583 tmp = readl (&dma->dmactl);
2584 if (!use_dma_chaining
2585 || (tmp & (1 << DMA_ENABLE)) == 0)
2586 restart_dma (ep);
2587 else if (ep->is_in && use_dma_chaining) {
2588 struct net2280_request *req;
320f3459 2589 __le32 dmacount;
1da177e4
LT		 2590
2591 /* the descriptor at the head of the chain
2592 * may still have VALID_BIT clear; that's
2593 * used to trigger changing DMA_FIFO_VALIDATE
2594 * (affects automagic zlp writes).
2595 */
2596 req = list_entry (ep->queue.next,
2597 struct net2280_request, queue);
2598 dmacount = req->td->dmacount;
551509d2 2599 dmacount &= cpu_to_le32 (
1da177e4
LT		 2600 (1 << VALID_BIT)
2601 | DMA_BYTE_COUNT_MASK);
2602 if (dmacount && (dmacount & valid_bit) == 0)
2603 restart_dma (ep);
2604 }
2605 }
2606 ep->irqs++;
2607 }
2608
2609 /* NOTE: there are other PCI errors we might usefully notice.
2610 * if they appear very often, here's where to try recovering.
2611 */
2612 if (stat & PCI_ERROR_INTERRUPTS) {
2613 ERROR (dev, "pci dma error; stat %08x\n", stat);
2614 stat &= ~PCI_ERROR_INTERRUPTS;
2615 /* these are fatal errors, but "maybe" they won't
2616 * happen again ...
2617 */
2618 stop_activity (dev, dev->driver);
2619 ep0_start (dev);
2620 stat = 0;
2621 }
2622
2623 if (stat)
2624 DEBUG (dev, "unhandled irqstat1 %08x\n", stat);
2625}
2626
7d12e780 2627static irqreturn_t net2280_irq (int irq, void *_dev)
1da177e4
LT		 2628{
2629 struct net2280 *dev = _dev;
2630
658ad5e0
AS		 2631 /* shared interrupt, not ours */
2632 if (!(readl(&dev->regs->irqstat0) & (1 << INTA_ASSERTED)))
2633 return IRQ_NONE;
2634
1da177e4
LT		 2635 spin_lock (&dev->lock);
2636
2637 /* handle disconnect, dma, and more */
2638 handle_stat1_irqs (dev, readl (&dev->regs->irqstat1));
2639
2640 /* control requests and PIO */
2641 handle_stat0_irqs (dev, readl (&dev->regs->irqstat0));
2642
2643 spin_unlock (&dev->lock);
2644
2645 return IRQ_HANDLED;
2646}
2647
2648/*-------------------------------------------------------------------------*/
2649
2650static void gadget_release (struct device *_dev)
2651{
2652 struct net2280 *dev = dev_get_drvdata (_dev);
2653
2654 kfree (dev);
2655}
2656
2657/* tear down the binding between this driver and the pci device */
2658
2659static void net2280_remove (struct pci_dev *pdev)
2660{
2661 struct net2280 *dev = pci_get_drvdata (pdev);
2662
0f91349b
SAS		 2663 usb_del_gadget_udc(&dev->gadget);
2664
6bea476c 2665 BUG_ON(dev->driver);
1da177e4
LT		 2666
2667 /* then clean up the resources we allocated during probe() */
2668 net2280_led_shutdown (dev);
2669 if (dev->requests) {
2670 int i;
2671 for (i = 1; i < 5; i++) {
2672 if (!dev->ep [i].dummy)
2673 continue;
2674 pci_pool_free (dev->requests, dev->ep [i].dummy,
2675 dev->ep [i].td_dma);
2676 }
2677 pci_pool_destroy (dev->requests);
2678 }
2679 if (dev->got_irq)
2680 free_irq (pdev->irq, dev);
2681 if (dev->regs)
2682 iounmap (dev->regs);
2683 if (dev->region)
2684 release_mem_region (pci_resource_start (pdev, 0),
2685 pci_resource_len (pdev, 0));
2686 if (dev->enabled)
2687 pci_disable_device (pdev);
2688 device_unregister (&dev->gadget.dev);
2689 device_remove_file (&pdev->dev, &dev_attr_registers);
2690 pci_set_drvdata (pdev, NULL);
2691
2692 INFO (dev, "unbind\n");
1da177e4
LT		 2693}
2694
2695/* wrap this driver around the specified device, but
2696 * don't respond over USB until a gadget driver binds to us.
2697 */
2698
2699static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id)
2700{
2701 struct net2280 *dev;
2702 unsigned long resource, len;
2703 void __iomem *base = NULL;
2704 int retval, i;
1da177e4 2705
1da177e4 2706 /* alloc, and start init */
e94b1766 2707 dev = kzalloc (sizeof *dev, GFP_KERNEL);
1da177e4
LT		 2708 if (dev == NULL){
2709 retval = -ENOMEM;
2710 goto done;
2711 }
2712
9fb81ce6 2713 pci_set_drvdata (pdev, dev);
1da177e4
LT		 2714 spin_lock_init (&dev->lock);
2715 dev->pdev = pdev;
2716 dev->gadget.ops = &net2280_ops;
d327ab5b 2717 dev->gadget.max_speed = USB_SPEED_HIGH;
1da177e4
LT		 2718
2719 /* the "gadget" abstracts/virtualizes the controller */
0031a06e 2720 dev_set_name(&dev->gadget.dev, "gadget");
1da177e4
LT		 2721 dev->gadget.dev.parent = &pdev->dev;
2722 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2723 dev->gadget.dev.release = gadget_release;
2724 dev->gadget.name = driver_name;
2725
2726 /* now all the pci goodies ... */
2727 if (pci_enable_device (pdev) < 0) {
901b3d75 2728 retval = -ENODEV;
1da177e4
LT		 2729 goto done;
2730 }
2731 dev->enabled = 1;
2732
2733 /* BAR 0 holds all the registers
2734 * BAR 1 is 8051 memory; unused here (note erratum 0103)
2735 * BAR 2 is fifo memory; unused here
2736 */
2737 resource = pci_resource_start (pdev, 0);
2738 len = pci_resource_len (pdev, 0);
2739 if (!request_mem_region (resource, len, driver_name)) {
2740 DEBUG (dev, "controller already in use\n");
2741 retval = -EBUSY;
2742 goto done;
2743 }
2744 dev->region = 1;
2745
901b3d75
DB		 2746 /* FIXME provide firmware download interface to put
2747 * 8051 code into the chip, e.g. to turn on PCI PM.
2748 */
2749
1da177e4
LT		 2750 base = ioremap_nocache (resource, len);
2751 if (base == NULL) {
2752 DEBUG (dev, "can't map memory\n");
2753 retval = -EFAULT;
2754 goto done;
2755 }
2756 dev->regs = (struct net2280_regs __iomem *) base;
2757 dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
2758 dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
2759 dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
2760 dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
2761 dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
2762
2763 /* put into initial config, link up all endpoints */
2764 writel (0, &dev->usb->usbctl);
2765 usb_reset (dev);
2766 usb_reinit (dev);
2767
2768 /* irq setup after old hardware is cleaned up */
2769 if (!pdev->irq) {
2770 ERROR (dev, "No IRQ. Check PCI setup!\n");
2771 retval = -ENODEV;
2772 goto done;
2773 }
c6387a48 2774
d54b5caa 2775 if (request_irq (pdev->irq, net2280_irq, IRQF_SHARED, driver_name, dev)
1da177e4 2776 != 0) {
c6387a48 2777 ERROR (dev, "request interrupt %d failed\n", pdev->irq);
1da177e4
LT		 2778 retval = -EBUSY;
2779 goto done;
2780 }
2781 dev->got_irq = 1;
2782
2783 /* DMA setup */
2784 /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */
2785 dev->requests = pci_pool_create ("requests", pdev,
2786 sizeof (struct net2280_dma),
2787 0 /* no alignment requirements */,
2788 0 /* or page-crossing issues */);
2789 if (!dev->requests) {
2790 DEBUG (dev, "can't get request pool\n");
2791 retval = -ENOMEM;
2792 goto done;
2793 }
2794 for (i = 1; i < 5; i++) {
2795 struct net2280_dma *td;
2796
2797 td = pci_pool_alloc (dev->requests, GFP_KERNEL,
2798 &dev->ep [i].td_dma);
2799 if (!td) {
2800 DEBUG (dev, "can't get dummy %d\n", i);
2801 retval = -ENOMEM;
2802 goto done;
2803 }
2804 td->dmacount = 0; /* not VALID */
551509d2 2805 td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
1da177e4
LT		 2806 td->dmadesc = td->dmaaddr;
2807 dev->ep [i].dummy = td;
2808 }
2809
2810 /* enable lower-overhead pci memory bursts during DMA */
2811 writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE)
2812 // 256 write retries may not be enough...
2813 // | (1 << PCI_RETRY_ABORT_ENABLE)
2814 | (1 << DMA_READ_MULTIPLE_ENABLE)
2815 | (1 << DMA_READ_LINE_ENABLE)
2816 , &dev->pci->pcimstctl);
2817 /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
2818 pci_set_master (pdev);
694625c0 2819 pci_try_set_mwi (pdev);
1da177e4
LT		 2820
2821 /* ... also flushes any posted pci writes */
2822 dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff;
2823
2824 /* done */
1da177e4 2825 INFO (dev, "%s\n", driver_desc);
c6387a48
DM		 2826 INFO (dev, "irq %d, pci mem %p, chip rev %04x\n",
2827 pdev->irq, base, dev->chiprev);
1da177e4
LT		 2828 INFO (dev, "version: " DRIVER_VERSION "; dma %s\n",
2829 use_dma
2830 ? (use_dma_chaining ? "chaining" : "enabled")
2831 : "disabled");
b3899dac
JG		 2832 retval = device_register (&dev->gadget.dev);
2833 if (retval) goto done;
2834 retval = device_create_file (&pdev->dev, &dev_attr_registers);
2835 if (retval) goto done;
1da177e4 2836
0f91349b
SAS		 2837 retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget);
2838 if (retval)
2839 goto done;
1da177e4
LT		 2840 return 0;
2841
2842done:
2843 if (dev)
2844 net2280_remove (pdev);
2845 return retval;
2846}
2847
2d61bde7
AS		 2848/* make sure the board is quiescent; otherwise it will continue
2849 * generating IRQs across the upcoming reboot.
2850 */
2851
2852static void net2280_shutdown (struct pci_dev *pdev)
2853{
2854 struct net2280 *dev = pci_get_drvdata (pdev);
2855
2856 /* disable IRQs */
2857 writel (0, &dev->regs->pciirqenb0);
2858 writel (0, &dev->regs->pciirqenb1);
2859
2860 /* disable the pullup so the host will think we're gone */
2861 writel (0, &dev->usb->usbctl);
2f076077
AS		 2862
2863 /* Disable full-speed test mode */
2864 writel(0, &dev->usb->xcvrdiag);
2d61bde7
AS		 2865}
2866
1da177e4
LT		 2867
2868/*-------------------------------------------------------------------------*/
2869
901b3d75
DB		 2870static const struct pci_device_id pci_ids [] = { {
2871 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
2872 .class_mask = ~0,
1da177e4
LT		 2873 .vendor = 0x17cc,
2874 .device = 0x2280,
2875 .subvendor = PCI_ANY_ID,
2876 .subdevice = PCI_ANY_ID,
950ee4c8 2877}, {
901b3d75
DB		 2878 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
2879 .class_mask = ~0,
950ee4c8
GL		 2880 .vendor = 0x17cc,
2881 .device = 0x2282,
2882 .subvendor = PCI_ANY_ID,
2883 .subdevice = PCI_ANY_ID,
1da177e4
LT		 2884
2885}, { /* end: all zeroes */ }
2886};
2887MODULE_DEVICE_TABLE (pci, pci_ids);
2888
2889/* pci driver glue; this is a "new style" PCI driver module */
2890static struct pci_driver net2280_pci_driver = {
2891 .name = (char *) driver_name,
2892 .id_table = pci_ids,
2893
2894 .probe = net2280_probe,
2895 .remove = net2280_remove,
2d61bde7 2896 .shutdown = net2280_shutdown,
1da177e4
LT		 2897
2898 /* FIXME add power management support */
2899};
2900
2901MODULE_DESCRIPTION (DRIVER_DESC);
2902MODULE_AUTHOR ("David Brownell");
2903MODULE_LICENSE ("GPL");
2904
2905static int __init init (void)
2906{
2907 if (!use_dma)
2908 use_dma_chaining = 0;
2909 return pci_register_driver (&net2280_pci_driver);
2910}
2911module_init (init);
2912
2913static void __exit cleanup (void)
2914{
2915 pci_unregister_driver (&net2280_pci_driver);
2916}
2917module_exit (cleanup);
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