Merge branch 'upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/linvil...
[pandora-kernel.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 File Storage, Serial, and Ethernet/RNDIS gadget drivers
13  * as well as Gadget Zero and Gadgetfs.
14  *
15  * DMA is enabled by default.  Drivers using transfer queues might use
16  * DMA chaining to remove IRQ latencies between transfers.  (Except when
17  * short OUT transfers happen.)  Drivers can use the req->no_interrupt
18  * hint to completely eliminate some IRQs, if a later IRQ is guaranteed
19  * and DMA chaining is enabled.
20  *
21  * Note that almost all the errata workarounds here are only needed for
22  * rev1 chips.  Rev1a silicon (0110) fixes almost all of them.
23  */
24
25 /*
26  * Copyright (C) 2003 David Brownell
27  * Copyright (C) 2003-2005 PLX Technology, Inc.
28  *
29  * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
30  *      with 2282 chip
31  *
32  * This program is free software; you can redistribute it and/or modify
33  * it under the terms of the GNU General Public License as published by
34  * the Free Software Foundation; either version 2 of the License, or
35  * (at your option) any later version.
36  *
37  * This program is distributed in the hope that it will be useful,
38  * but WITHOUT ANY WARRANTY; without even the implied warranty of
39  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
40  * GNU General Public License for more details.
41  *
42  * You should have received a copy of the GNU General Public License
43  * along with this program; if not, write to the Free Software
44  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
45  */
46
47 #undef  DEBUG           /* messages on error and most fault paths */
48 #undef  VERBOSE         /* extra debug messages (success too) */
49
50 #include <linux/module.h>
51 #include <linux/pci.h>
52 #include <linux/dma-mapping.h>
53 #include <linux/kernel.h>
54 #include <linux/delay.h>
55 #include <linux/ioport.h>
56 #include <linux/sched.h>
57 #include <linux/slab.h>
58 #include <linux/smp_lock.h>
59 #include <linux/errno.h>
60 #include <linux/init.h>
61 #include <linux/timer.h>
62 #include <linux/list.h>
63 #include <linux/interrupt.h>
64 #include <linux/moduleparam.h>
65 #include <linux/device.h>
66 #include <linux/usb_ch9.h>
67 #include <linux/usb_gadget.h>
68
69 #include <asm/byteorder.h>
70 #include <asm/io.h>
71 #include <asm/irq.h>
72 #include <asm/system.h>
73 #include <asm/unaligned.h>
74
75
76 #define DRIVER_DESC             "PLX NET228x USB Peripheral Controller"
77 #define DRIVER_VERSION          "2005 Sept 27"
78
79 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
80 #define EP_DONTUSE              13      /* nonzero */
81
82 #define USE_RDK_LEDS            /* GPIO pins control three LEDs */
83
84
85 static const char driver_name [] = "net2280";
86 static const char driver_desc [] = DRIVER_DESC;
87
88 static const char ep0name [] = "ep0";
89 static const char *const ep_name [] = {
90         ep0name,
91         "ep-a", "ep-b", "ep-c", "ep-d",
92         "ep-e", "ep-f",
93 };
94
95 /* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO)
96  * use_dma_chaining -- dma descriptor queueing gives even more irq reduction
97  *
98  * The net2280 DMA engines are not tightly integrated with their FIFOs;
99  * not all cases are (yet) handled well in this driver or the silicon.
100  * Some gadget drivers work better with the dma support here than others.
101  * These two parameters let you use PIO or more aggressive DMA.
102  */
103 static int use_dma = 1;
104 static int use_dma_chaining = 0;
105
106 /* "modprobe net2280 use_dma=n" etc */
107 module_param (use_dma, bool, S_IRUGO);
108 module_param (use_dma_chaining, bool, S_IRUGO);
109
110
111 /* mode 0 == ep-{a,b,c,d} 1K fifo each
112  * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
113  * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
114  */
115 static ushort fifo_mode = 0;
116
117 /* "modprobe net2280 fifo_mode=1" etc */
118 module_param (fifo_mode, ushort, 0644);
119
120 /* enable_suspend -- When enabled, the driver will respond to
121  * USB suspend requests by powering down the NET2280.  Otherwise,
122  * USB suspend requests will be ignored.  This is acceptible for
123  * self-powered devices
124  */
125 static int enable_suspend = 0;
126
127 /* "modprobe net2280 enable_suspend=1" etc */
128 module_param (enable_suspend, bool, S_IRUGO);
129
130
131 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
132
133 #if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG)
134 static char *type_string (u8 bmAttributes)
135 {
136         switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
137         case USB_ENDPOINT_XFER_BULK:    return "bulk";
138         case USB_ENDPOINT_XFER_ISOC:    return "iso";
139         case USB_ENDPOINT_XFER_INT:     return "intr";
140         };
141         return "control";
142 }
143 #endif
144
145 #include "net2280.h"
146
147 #define valid_bit       __constant_cpu_to_le32 (1 << VALID_BIT)
148 #define dma_done_ie     __constant_cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE)
149
150 /*-------------------------------------------------------------------------*/
151
152 static int
153 net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
154 {
155         struct net2280          *dev;
156         struct net2280_ep       *ep;
157         u32                     max, tmp;
158         unsigned long           flags;
159
160         ep = container_of (_ep, struct net2280_ep, ep);
161         if (!_ep || !desc || ep->desc || _ep->name == ep0name
162                         || desc->bDescriptorType != USB_DT_ENDPOINT)
163                 return -EINVAL;
164         dev = ep->dev;
165         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
166                 return -ESHUTDOWN;
167
168         /* erratum 0119 workaround ties up an endpoint number */
169         if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE)
170                 return -EDOM;
171
172         /* sanity check ep-e/ep-f since their fifos are small */
173         max = le16_to_cpu (desc->wMaxPacketSize) & 0x1fff;
174         if (ep->num > 4 && max > 64)
175                 return -ERANGE;
176
177         spin_lock_irqsave (&dev->lock, flags);
178         _ep->maxpacket = max & 0x7ff;
179         ep->desc = desc;
180
181         /* ep_reset() has already been called */
182         ep->stopped = 0;
183         ep->out_overflow = 0;
184
185         /* set speed-dependent max packet; may kick in high bandwidth */
186         set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max);
187
188         /* FIFO lines can't go to different packets.  PIO is ok, so
189          * use it instead of troublesome (non-bulk) multi-packet DMA.
190          */
191         if (ep->dma && (max % 4) != 0 && use_dma_chaining) {
192                 DEBUG (ep->dev, "%s, no dma for maxpacket %d\n",
193                         ep->ep.name, ep->ep.maxpacket);
194                 ep->dma = NULL;
195         }
196
197         /* set type, direction, address; reset fifo counters */
198         writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
199         tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
200         if (tmp == USB_ENDPOINT_XFER_INT) {
201                 /* erratum 0105 workaround prevents hs NYET */
202                 if (dev->chiprev == 0100
203                                 && dev->gadget.speed == USB_SPEED_HIGH
204                                 && !(desc->bEndpointAddress & USB_DIR_IN))
205                         writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE),
206                                 &ep->regs->ep_rsp);
207         } else if (tmp == USB_ENDPOINT_XFER_BULK) {
208                 /* catch some particularly blatant driver bugs */
209                 if ((dev->gadget.speed == USB_SPEED_HIGH
210                                         && max != 512)
211                                 || (dev->gadget.speed == USB_SPEED_FULL
212                                         && max > 64)) {
213                         spin_unlock_irqrestore (&dev->lock, flags);
214                         return -ERANGE;
215                 }
216         }
217         ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0;
218         tmp <<= ENDPOINT_TYPE;
219         tmp |= desc->bEndpointAddress;
220         tmp |= (4 << ENDPOINT_BYTE_COUNT);      /* default full fifo lines */
221         tmp |= 1 << ENDPOINT_ENABLE;
222         wmb ();
223
224         /* for OUT transfers, block the rx fifo until a read is posted */
225         ep->is_in = (tmp & USB_DIR_IN) != 0;
226         if (!ep->is_in)
227                 writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
228         else if (dev->pdev->device != 0x2280) {
229                 /* Added for 2282, Don't use nak packets on an in endpoint,
230                  * this was ignored on 2280
231                  */
232                 writel ((1 << CLEAR_NAK_OUT_PACKETS)
233                         | (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
234         }
235
236         writel (tmp, &ep->regs->ep_cfg);
237
238         /* enable irqs */
239         if (!ep->dma) {                         /* pio, per-packet */
240                 tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
241                 writel (tmp, &dev->regs->pciirqenb0);
242
243                 tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
244                         | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
245                 if (dev->pdev->device == 0x2280)
246                         tmp |= readl (&ep->regs->ep_irqenb);
247                 writel (tmp, &ep->regs->ep_irqenb);
248         } else {                                /* dma, per-request */
249                 tmp = (1 << (8 + ep->num));     /* completion */
250                 tmp |= readl (&dev->regs->pciirqenb1);
251                 writel (tmp, &dev->regs->pciirqenb1);
252
253                 /* for short OUT transfers, dma completions can't
254                  * advance the queue; do it pio-style, by hand.
255                  * NOTE erratum 0112 workaround #2
256                  */
257                 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
258                         tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
259                         writel (tmp, &ep->regs->ep_irqenb);
260
261                         tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
262                         writel (tmp, &dev->regs->pciirqenb0);
263                 }
264         }
265
266         tmp = desc->bEndpointAddress;
267         DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
268                 _ep->name, tmp & 0x0f, DIR_STRING (tmp),
269                 type_string (desc->bmAttributes),
270                 ep->dma ? "dma" : "pio", max);
271
272         /* pci writes may still be posted */
273         spin_unlock_irqrestore (&dev->lock, flags);
274         return 0;
275 }
276
277 static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec)
278 {
279         u32     result;
280
281         do {
282                 result = readl (ptr);
283                 if (result == ~(u32)0)          /* "device unplugged" */
284                         return -ENODEV;
285                 result &= mask;
286                 if (result == done)
287                         return 0;
288                 udelay (1);
289                 usec--;
290         } while (usec > 0);
291         return -ETIMEDOUT;
292 }
293
294 static const struct usb_ep_ops net2280_ep_ops;
295
296 static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep)
297 {
298         u32             tmp;
299
300         ep->desc = NULL;
301         INIT_LIST_HEAD (&ep->queue);
302
303         ep->ep.maxpacket = ~0;
304         ep->ep.ops = &net2280_ep_ops;
305
306         /* disable the dma, irqs, endpoint... */
307         if (ep->dma) {
308                 writel (0, &ep->dma->dmactl);
309                 writel (  (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
310                         | (1 << DMA_TRANSACTION_DONE_INTERRUPT)
311                         | (1 << DMA_ABORT)
312                         , &ep->dma->dmastat);
313
314                 tmp = readl (&regs->pciirqenb0);
315                 tmp &= ~(1 << ep->num);
316                 writel (tmp, &regs->pciirqenb0);
317         } else {
318                 tmp = readl (&regs->pciirqenb1);
319                 tmp &= ~(1 << (8 + ep->num));   /* completion */
320                 writel (tmp, &regs->pciirqenb1);
321         }
322         writel (0, &ep->regs->ep_irqenb);
323
324         /* init to our chosen defaults, notably so that we NAK OUT
325          * packets until the driver queues a read (+note erratum 0112)
326          */
327         if (!ep->is_in || ep->dev->pdev->device == 0x2280) {
328                 tmp = (1 << SET_NAK_OUT_PACKETS_MODE)
329                 | (1 << SET_NAK_OUT_PACKETS)
330                 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
331                 | (1 << CLEAR_INTERRUPT_MODE);
332         } else {
333                 /* added for 2282 */
334                 tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE)
335                 | (1 << CLEAR_NAK_OUT_PACKETS)
336                 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
337                 | (1 << CLEAR_INTERRUPT_MODE);
338         }
339
340         if (ep->num != 0) {
341                 tmp |= (1 << CLEAR_ENDPOINT_TOGGLE)
342                         | (1 << CLEAR_ENDPOINT_HALT);
343         }
344         writel (tmp, &ep->regs->ep_rsp);
345
346         /* scrub most status bits, and flush any fifo state */
347         if (ep->dev->pdev->device == 0x2280)
348                 tmp = (1 << FIFO_OVERFLOW)
349                         | (1 << FIFO_UNDERFLOW);
350         else
351                 tmp = 0;
352
353         writel (tmp | (1 << TIMEOUT)
354                 | (1 << USB_STALL_SENT)
355                 | (1 << USB_IN_NAK_SENT)
356                 | (1 << USB_IN_ACK_RCVD)
357                 | (1 << USB_OUT_PING_NAK_SENT)
358                 | (1 << USB_OUT_ACK_SENT)
359                 | (1 << FIFO_FLUSH)
360                 | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
361                 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
362                 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
363                 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
364                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
365                 | (1 << DATA_IN_TOKEN_INTERRUPT)
366                 , &ep->regs->ep_stat);
367
368         /* fifo size is handled separately */
369 }
370
371 static void nuke (struct net2280_ep *);
372
373 static int net2280_disable (struct usb_ep *_ep)
374 {
375         struct net2280_ep       *ep;
376         unsigned long           flags;
377
378         ep = container_of (_ep, struct net2280_ep, ep);
379         if (!_ep || !ep->desc || _ep->name == ep0name)
380                 return -EINVAL;
381
382         spin_lock_irqsave (&ep->dev->lock, flags);
383         nuke (ep);
384         ep_reset (ep->dev->regs, ep);
385
386         VDEBUG (ep->dev, "disabled %s %s\n",
387                         ep->dma ? "dma" : "pio", _ep->name);
388
389         /* synch memory views with the device */
390         (void) readl (&ep->regs->ep_cfg);
391
392         if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4)
393                 ep->dma = &ep->dev->dma [ep->num - 1];
394
395         spin_unlock_irqrestore (&ep->dev->lock, flags);
396         return 0;
397 }
398
399 /*-------------------------------------------------------------------------*/
400
401 static struct usb_request *
402 net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
403 {
404         struct net2280_ep       *ep;
405         struct net2280_request  *req;
406
407         if (!_ep)
408                 return NULL;
409         ep = container_of (_ep, struct net2280_ep, ep);
410
411         req = kzalloc(sizeof(*req), gfp_flags);
412         if (!req)
413                 return NULL;
414
415         req->req.dma = DMA_ADDR_INVALID;
416         INIT_LIST_HEAD (&req->queue);
417
418         /* this dma descriptor may be swapped with the previous dummy */
419         if (ep->dma) {
420                 struct net2280_dma      *td;
421
422                 td = pci_pool_alloc (ep->dev->requests, gfp_flags,
423                                 &req->td_dma);
424                 if (!td) {
425                         kfree (req);
426                         return NULL;
427                 }
428                 td->dmacount = 0;       /* not VALID */
429                 td->dmaaddr = __constant_cpu_to_le32 (DMA_ADDR_INVALID);
430                 td->dmadesc = td->dmaaddr;
431                 req->td = td;
432         }
433         return &req->req;
434 }
435
436 static void
437 net2280_free_request (struct usb_ep *_ep, struct usb_request *_req)
438 {
439         struct net2280_ep       *ep;
440         struct net2280_request  *req;
441
442         ep = container_of (_ep, struct net2280_ep, ep);
443         if (!_ep || !_req)
444                 return;
445
446         req = container_of (_req, struct net2280_request, req);
447         WARN_ON (!list_empty (&req->queue));
448         if (req->td)
449                 pci_pool_free (ep->dev->requests, req->td, req->td_dma);
450         kfree (req);
451 }
452
453 /*-------------------------------------------------------------------------*/
454
455 /*
456  * dma-coherent memory allocation (for dma-capable endpoints)
457  *
458  * NOTE: the dma_*_coherent() API calls suck.  Most implementations are
459  * (a) page-oriented, so small buffers lose big; and (b) asymmetric with
460  * respect to calls with irqs disabled:  alloc is safe, free is not.
461  * We currently work around (b), but not (a).
462  */
463
464 static void *
465 net2280_alloc_buffer (
466         struct usb_ep           *_ep,
467         unsigned                bytes,
468         dma_addr_t              *dma,
469         gfp_t                   gfp_flags
470 )
471 {
472         void                    *retval;
473         struct net2280_ep       *ep;
474
475         ep = container_of (_ep, struct net2280_ep, ep);
476         if (!_ep)
477                 return NULL;
478         *dma = DMA_ADDR_INVALID;
479
480         if (ep->dma)
481                 retval = dma_alloc_coherent(&ep->dev->pdev->dev,
482                                 bytes, dma, gfp_flags);
483         else
484                 retval = kmalloc(bytes, gfp_flags);
485         return retval;
486 }
487
488 static DEFINE_SPINLOCK(buflock);
489 static LIST_HEAD(buffers);
490
491 struct free_record {
492         struct list_head        list;
493         struct device           *dev;
494         unsigned                bytes;
495         dma_addr_t              dma;
496 };
497
498 static void do_free(unsigned long ignored)
499 {
500         spin_lock_irq(&buflock);
501         while (!list_empty(&buffers)) {
502                 struct free_record      *buf;
503
504                 buf = list_entry(buffers.next, struct free_record, list);
505                 list_del(&buf->list);
506                 spin_unlock_irq(&buflock);
507
508                 dma_free_coherent(buf->dev, buf->bytes, buf, buf->dma);
509
510                 spin_lock_irq(&buflock);
511         }
512         spin_unlock_irq(&buflock);
513 }
514
515 static DECLARE_TASKLET(deferred_free, do_free, 0);
516
517 static void
518 net2280_free_buffer (
519         struct usb_ep *_ep,
520         void *address,
521         dma_addr_t dma,
522         unsigned bytes
523 ) {
524         /* free memory into the right allocator */
525         if (dma != DMA_ADDR_INVALID) {
526                 struct net2280_ep       *ep;
527                 struct free_record      *buf = address;
528                 unsigned long           flags;
529
530                 ep = container_of(_ep, struct net2280_ep, ep);
531                 if (!_ep)
532                         return;
533
534                 ep = container_of (_ep, struct net2280_ep, ep);
535                 buf->dev = &ep->dev->pdev->dev;
536                 buf->bytes = bytes;
537                 buf->dma = dma;
538
539                 spin_lock_irqsave(&buflock, flags);
540                 list_add_tail(&buf->list, &buffers);
541                 tasklet_schedule(&deferred_free);
542                 spin_unlock_irqrestore(&buflock, flags);
543         } else
544                 kfree (address);
545 }
546
547 /*-------------------------------------------------------------------------*/
548
549 /* load a packet into the fifo we use for usb IN transfers.
550  * works for all endpoints.
551  *
552  * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
553  * at a time, but this code is simpler because it knows it only writes
554  * one packet.  ep-a..ep-d should use dma instead.
555  */
556 static void
557 write_fifo (struct net2280_ep *ep, struct usb_request *req)
558 {
559         struct net2280_ep_regs  __iomem *regs = ep->regs;
560         u8                      *buf;
561         u32                     tmp;
562         unsigned                count, total;
563
564         /* INVARIANT:  fifo is currently empty. (testable) */
565
566         if (req) {
567                 buf = req->buf + req->actual;
568                 prefetch (buf);
569                 total = req->length - req->actual;
570         } else {
571                 total = 0;
572                 buf = NULL;
573         }
574
575         /* write just one packet at a time */
576         count = ep->ep.maxpacket;
577         if (count > total)      /* min() cannot be used on a bitfield */
578                 count = total;
579
580         VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
581                         ep->ep.name, count,
582                         (count != ep->ep.maxpacket) ? " (short)" : "",
583                         req);
584         while (count >= 4) {
585                 /* NOTE be careful if you try to align these. fifo lines
586                  * should normally be full (4 bytes) and successive partial
587                  * lines are ok only in certain cases.
588                  */
589                 tmp = get_unaligned ((u32 *)buf);
590                 cpu_to_le32s (&tmp);
591                 writel (tmp, &regs->ep_data);
592                 buf += 4;
593                 count -= 4;
594         }
595
596         /* last fifo entry is "short" unless we wrote a full packet.
597          * also explicitly validate last word in (periodic) transfers
598          * when maxpacket is not a multiple of 4 bytes.
599          */
600         if (count || total < ep->ep.maxpacket) {
601                 tmp = count ? get_unaligned ((u32 *)buf) : count;
602                 cpu_to_le32s (&tmp);
603                 set_fifo_bytecount (ep, count & 0x03);
604                 writel (tmp, &regs->ep_data);
605         }
606
607         /* pci writes may still be posted */
608 }
609
610 /* work around erratum 0106: PCI and USB race over the OUT fifo.
611  * caller guarantees chiprev 0100, out endpoint is NAKing, and
612  * there's no real data in the fifo.
613  *
614  * NOTE:  also used in cases where that erratum doesn't apply:
615  * where the host wrote "too much" data to us.
616  */
617 static void out_flush (struct net2280_ep *ep)
618 {
619         u32     __iomem *statp;
620         u32     tmp;
621
622         ASSERT_OUT_NAKING (ep);
623
624         statp = &ep->regs->ep_stat;
625         writel (  (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
626                 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
627                 , statp);
628         writel ((1 << FIFO_FLUSH), statp);
629         mb ();
630         tmp = readl (statp);
631         if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
632                         /* high speed did bulk NYET; fifo isn't filling */
633                         && ep->dev->gadget.speed == USB_SPEED_FULL) {
634                 unsigned        usec;
635
636                 usec = 50;              /* 64 byte bulk/interrupt */
637                 handshake (statp, (1 << USB_OUT_PING_NAK_SENT),
638                                 (1 << USB_OUT_PING_NAK_SENT), usec);
639                 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
640         }
641 }
642
643 /* unload packet(s) from the fifo we use for usb OUT transfers.
644  * returns true iff the request completed, because of short packet
645  * or the request buffer having filled with full packets.
646  *
647  * for ep-a..ep-d this will read multiple packets out when they
648  * have been accepted.
649  */
650 static int
651 read_fifo (struct net2280_ep *ep, struct net2280_request *req)
652 {
653         struct net2280_ep_regs  __iomem *regs = ep->regs;
654         u8                      *buf = req->req.buf + req->req.actual;
655         unsigned                count, tmp, is_short;
656         unsigned                cleanup = 0, prevent = 0;
657
658         /* erratum 0106 ... packets coming in during fifo reads might
659          * be incompletely rejected.  not all cases have workarounds.
660          */
661         if (ep->dev->chiprev == 0x0100
662                         && ep->dev->gadget.speed == USB_SPEED_FULL) {
663                 udelay (1);
664                 tmp = readl (&ep->regs->ep_stat);
665                 if ((tmp & (1 << NAK_OUT_PACKETS)))
666                         cleanup = 1;
667                 else if ((tmp & (1 << FIFO_FULL))) {
668                         start_out_naking (ep);
669                         prevent = 1;
670                 }
671                 /* else: hope we don't see the problem */
672         }
673
674         /* never overflow the rx buffer. the fifo reads packets until
675          * it sees a short one; we might not be ready for them all.
676          */
677         prefetchw (buf);
678         count = readl (&regs->ep_avail);
679         if (unlikely (count == 0)) {
680                 udelay (1);
681                 tmp = readl (&ep->regs->ep_stat);
682                 count = readl (&regs->ep_avail);
683                 /* handled that data already? */
684                 if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0)
685                         return 0;
686         }
687
688         tmp = req->req.length - req->req.actual;
689         if (count > tmp) {
690                 /* as with DMA, data overflow gets flushed */
691                 if ((tmp % ep->ep.maxpacket) != 0) {
692                         ERROR (ep->dev,
693                                 "%s out fifo %d bytes, expected %d\n",
694                                 ep->ep.name, count, tmp);
695                         req->req.status = -EOVERFLOW;
696                         cleanup = 1;
697                         /* NAK_OUT_PACKETS will be set, so flushing is safe;
698                          * the next read will start with the next packet
699                          */
700                 } /* else it's a ZLP, no worries */
701                 count = tmp;
702         }
703         req->req.actual += count;
704
705         is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
706
707         VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
708                         ep->ep.name, count, is_short ? " (short)" : "",
709                         cleanup ? " flush" : "", prevent ? " nak" : "",
710                         req, req->req.actual, req->req.length);
711
712         while (count >= 4) {
713                 tmp = readl (&regs->ep_data);
714                 cpu_to_le32s (&tmp);
715                 put_unaligned (tmp, (u32 *)buf);
716                 buf += 4;
717                 count -= 4;
718         }
719         if (count) {
720                 tmp = readl (&regs->ep_data);
721                 /* LE conversion is implicit here: */
722                 do {
723                         *buf++ = (u8) tmp;
724                         tmp >>= 8;
725                 } while (--count);
726         }
727         if (cleanup)
728                 out_flush (ep);
729         if (prevent) {
730                 writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
731                 (void) readl (&ep->regs->ep_rsp);
732         }
733
734         return is_short || ((req->req.actual == req->req.length)
735                                 && !req->req.zero);
736 }
737
738 /* fill out dma descriptor to match a given request */
739 static void
740 fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid)
741 {
742         struct net2280_dma      *td = req->td;
743         u32                     dmacount = req->req.length;
744
745         /* don't let DMA continue after a short OUT packet,
746          * so overruns can't affect the next transfer.
747          * in case of overruns on max-size packets, we can't
748          * stop the fifo from filling but we can flush it.
749          */
750         if (ep->is_in)
751                 dmacount |= (1 << DMA_DIRECTION);
752         if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0)
753                         || ep->dev->pdev->device != 0x2280)
754                 dmacount |= (1 << END_OF_CHAIN);
755
756         req->valid = valid;
757         if (valid)
758                 dmacount |= (1 << VALID_BIT);
759         if (likely(!req->req.no_interrupt || !use_dma_chaining))
760                 dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE);
761
762         /* td->dmadesc = previously set by caller */
763         td->dmaaddr = cpu_to_le32 (req->req.dma);
764
765         /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
766         wmb ();
767         td->dmacount = cpu_to_le32p (&dmacount);
768 }
769
770 static const u32 dmactl_default =
771                   (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
772                 | (1 << DMA_CLEAR_COUNT_ENABLE)
773                 /* erratum 0116 workaround part 1 (use POLLING) */
774                 | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE)
775                 | (1 << DMA_VALID_BIT_POLLING_ENABLE)
776                 | (1 << DMA_VALID_BIT_ENABLE)
777                 | (1 << DMA_SCATTER_GATHER_ENABLE)
778                 /* erratum 0116 workaround part 2 (no AUTOSTART) */
779                 | (1 << DMA_ENABLE);
780
781 static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma)
782 {
783         handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50);
784 }
785
786 static inline void stop_dma (struct net2280_dma_regs __iomem *dma)
787 {
788         writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl);
789         spin_stop_dma (dma);
790 }
791
792 static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma)
793 {
794         struct net2280_dma_regs __iomem *dma = ep->dma;
795         unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION);
796
797         if (ep->dev->pdev->device != 0x2280)
798                 tmp |= (1 << END_OF_CHAIN);
799
800         writel (tmp, &dma->dmacount);
801         writel (readl (&dma->dmastat), &dma->dmastat);
802
803         writel (td_dma, &dma->dmadesc);
804         writel (dmactl, &dma->dmactl);
805
806         /* erratum 0116 workaround part 3:  pci arbiter away from net2280 */
807         (void) readl (&ep->dev->pci->pcimstctl);
808
809         writel ((1 << DMA_START), &dma->dmastat);
810
811         if (!ep->is_in)
812                 stop_out_naking (ep);
813 }
814
815 static void start_dma (struct net2280_ep *ep, struct net2280_request *req)
816 {
817         u32                     tmp;
818         struct net2280_dma_regs __iomem *dma = ep->dma;
819
820         /* FIXME can't use DMA for ZLPs */
821
822         /* on this path we "know" there's no dma active (yet) */
823         WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE));
824         writel (0, &ep->dma->dmactl);
825
826         /* previous OUT packet might have been short */
827         if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat))
828                                 & (1 << NAK_OUT_PACKETS)) != 0) {
829                 writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT),
830                         &ep->regs->ep_stat);
831
832                 tmp = readl (&ep->regs->ep_avail);
833                 if (tmp) {
834                         writel (readl (&dma->dmastat), &dma->dmastat);
835
836                         /* transfer all/some fifo data */
837                         writel (req->req.dma, &dma->dmaaddr);
838                         tmp = min (tmp, req->req.length);
839
840                         /* dma irq, faking scatterlist status */
841                         req->td->dmacount = cpu_to_le32 (req->req.length - tmp);
842                         writel ((1 << DMA_DONE_INTERRUPT_ENABLE)
843                                 | tmp, &dma->dmacount);
844                         req->td->dmadesc = 0;
845                         req->valid = 1;
846
847                         writel ((1 << DMA_ENABLE), &dma->dmactl);
848                         writel ((1 << DMA_START), &dma->dmastat);
849                         return;
850                 }
851         }
852
853         tmp = dmactl_default;
854
855         /* force packet boundaries between dma requests, but prevent the
856          * controller from automagically writing a last "short" packet
857          * (zero length) unless the driver explicitly said to do that.
858          */
859         if (ep->is_in) {
860                 if (likely ((req->req.length % ep->ep.maxpacket) != 0
861                                 || req->req.zero)) {
862                         tmp |= (1 << DMA_FIFO_VALIDATE);
863                         ep->in_fifo_validate = 1;
864                 } else
865                         ep->in_fifo_validate = 0;
866         }
867
868         /* init req->td, pointing to the current dummy */
869         req->td->dmadesc = cpu_to_le32 (ep->td_dma);
870         fill_dma_desc (ep, req, 1);
871
872         if (!use_dma_chaining)
873                 req->td->dmacount |= __constant_cpu_to_le32 (1 << END_OF_CHAIN);
874
875         start_queue (ep, tmp, req->td_dma);
876 }
877
878 static inline void
879 queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid)
880 {
881         struct net2280_dma      *end;
882         dma_addr_t              tmp;
883
884         /* swap new dummy for old, link; fill and maybe activate */
885         end = ep->dummy;
886         ep->dummy = req->td;
887         req->td = end;
888
889         tmp = ep->td_dma;
890         ep->td_dma = req->td_dma;
891         req->td_dma = tmp;
892
893         end->dmadesc = cpu_to_le32 (ep->td_dma);
894
895         fill_dma_desc (ep, req, valid);
896 }
897
898 static void
899 done (struct net2280_ep *ep, struct net2280_request *req, int status)
900 {
901         struct net2280          *dev;
902         unsigned                stopped = ep->stopped;
903
904         list_del_init (&req->queue);
905
906         if (req->req.status == -EINPROGRESS)
907                 req->req.status = status;
908         else
909                 status = req->req.status;
910
911         dev = ep->dev;
912         if (req->mapped) {
913                 pci_unmap_single (dev->pdev, req->req.dma, req->req.length,
914                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
915                 req->req.dma = DMA_ADDR_INVALID;
916                 req->mapped = 0;
917         }
918
919         if (status && status != -ESHUTDOWN)
920                 VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n",
921                         ep->ep.name, &req->req, status,
922                         req->req.actual, req->req.length);
923
924         /* don't modify queue heads during completion callback */
925         ep->stopped = 1;
926         spin_unlock (&dev->lock);
927         req->req.complete (&ep->ep, &req->req);
928         spin_lock (&dev->lock);
929         ep->stopped = stopped;
930 }
931
932 /*-------------------------------------------------------------------------*/
933
934 static int
935 net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
936 {
937         struct net2280_request  *req;
938         struct net2280_ep       *ep;
939         struct net2280          *dev;
940         unsigned long           flags;
941
942         /* we always require a cpu-view buffer, so that we can
943          * always use pio (as fallback or whatever).
944          */
945         req = container_of (_req, struct net2280_request, req);
946         if (!_req || !_req->complete || !_req->buf
947                         || !list_empty (&req->queue))
948                 return -EINVAL;
949         if (_req->length > (~0 & DMA_BYTE_COUNT_MASK))
950                 return -EDOM;
951         ep = container_of (_ep, struct net2280_ep, ep);
952         if (!_ep || (!ep->desc && ep->num != 0))
953                 return -EINVAL;
954         dev = ep->dev;
955         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
956                 return -ESHUTDOWN;
957
958         /* FIXME implement PIO fallback for ZLPs with DMA */
959         if (ep->dma && _req->length == 0)
960                 return -EOPNOTSUPP;
961
962         /* set up dma mapping in case the caller didn't */
963         if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
964                 _req->dma = pci_map_single (dev->pdev, _req->buf, _req->length,
965                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
966                 req->mapped = 1;
967         }
968
969 #if 0
970         VDEBUG (dev, "%s queue req %p, len %d buf %p\n",
971                         _ep->name, _req, _req->length, _req->buf);
972 #endif
973
974         spin_lock_irqsave (&dev->lock, flags);
975
976         _req->status = -EINPROGRESS;
977         _req->actual = 0;
978
979         /* kickstart this i/o queue? */
980         if (list_empty (&ep->queue) && !ep->stopped) {
981                 /* use DMA if the endpoint supports it, else pio */
982                 if (ep->dma)
983                         start_dma (ep, req);
984                 else {
985                         /* maybe there's no control data, just status ack */
986                         if (ep->num == 0 && _req->length == 0) {
987                                 allow_status (ep);
988                                 done (ep, req, 0);
989                                 VDEBUG (dev, "%s status ack\n", ep->ep.name);
990                                 goto done;
991                         }
992
993                         /* PIO ... stuff the fifo, or unblock it.  */
994                         if (ep->is_in)
995                                 write_fifo (ep, _req);
996                         else if (list_empty (&ep->queue)) {
997                                 u32     s;
998
999                                 /* OUT FIFO might have packet(s) buffered */
1000                                 s = readl (&ep->regs->ep_stat);
1001                                 if ((s & (1 << FIFO_EMPTY)) == 0) {
1002                                         /* note:  _req->short_not_ok is
1003                                          * ignored here since PIO _always_
1004                                          * stops queue advance here, and
1005                                          * _req->status doesn't change for
1006                                          * short reads (only _req->actual)
1007                                          */
1008                                         if (read_fifo (ep, req)) {
1009                                                 done (ep, req, 0);
1010                                                 if (ep->num == 0)
1011                                                         allow_status (ep);
1012                                                 /* don't queue it */
1013                                                 req = NULL;
1014                                         } else
1015                                                 s = readl (&ep->regs->ep_stat);
1016                                 }
1017
1018                                 /* don't NAK, let the fifo fill */
1019                                 if (req && (s & (1 << NAK_OUT_PACKETS)))
1020                                         writel ((1 << CLEAR_NAK_OUT_PACKETS),
1021                                                         &ep->regs->ep_rsp);
1022                         }
1023                 }
1024
1025         } else if (ep->dma) {
1026                 int     valid = 1;
1027
1028                 if (ep->is_in) {
1029                         int     expect;
1030
1031                         /* preventing magic zlps is per-engine state, not
1032                          * per-transfer; irq logic must recover hiccups.
1033                          */
1034                         expect = likely (req->req.zero
1035                                 || (req->req.length % ep->ep.maxpacket) != 0);
1036                         if (expect != ep->in_fifo_validate)
1037                                 valid = 0;
1038                 }
1039                 queue_dma (ep, req, valid);
1040
1041         } /* else the irq handler advances the queue. */
1042
1043         ep->responded = 1;
1044         if (req)
1045                 list_add_tail (&req->queue, &ep->queue);
1046 done:
1047         spin_unlock_irqrestore (&dev->lock, flags);
1048
1049         /* pci writes may still be posted */
1050         return 0;
1051 }
1052
1053 static inline void
1054 dma_done (
1055         struct net2280_ep *ep,
1056         struct net2280_request *req,
1057         u32 dmacount,
1058         int status
1059 )
1060 {
1061         req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1062         done (ep, req, status);
1063 }
1064
1065 static void restart_dma (struct net2280_ep *ep);
1066
1067 static void scan_dma_completions (struct net2280_ep *ep)
1068 {
1069         /* only look at descriptors that were "naturally" retired,
1070          * so fifo and list head state won't matter
1071          */
1072         while (!list_empty (&ep->queue)) {
1073                 struct net2280_request  *req;
1074                 u32                     tmp;
1075
1076                 req = list_entry (ep->queue.next,
1077                                 struct net2280_request, queue);
1078                 if (!req->valid)
1079                         break;
1080                 rmb ();
1081                 tmp = le32_to_cpup (&req->td->dmacount);
1082                 if ((tmp & (1 << VALID_BIT)) != 0)
1083                         break;
1084
1085                 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1086                  * cases where DMA must be aborted; this code handles
1087                  * all non-abort DMA completions.
1088                  */
1089                 if (unlikely (req->td->dmadesc == 0)) {
1090                         /* paranoia */
1091                         tmp = readl (&ep->dma->dmacount);
1092                         if (tmp & DMA_BYTE_COUNT_MASK)
1093                                 break;
1094                         /* single transfer mode */
1095                         dma_done (ep, req, tmp, 0);
1096                         break;
1097                 } else if (!ep->is_in
1098                                 && (req->req.length % ep->ep.maxpacket) != 0) {
1099                         tmp = readl (&ep->regs->ep_stat);
1100
1101                         /* AVOID TROUBLE HERE by not issuing short reads from
1102                          * your gadget driver.  That helps avoids errata 0121,
1103                          * 0122, and 0124; not all cases trigger the warning.
1104                          */
1105                         if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
1106                                 WARN (ep->dev, "%s lost packet sync!\n",
1107                                                 ep->ep.name);
1108                                 req->req.status = -EOVERFLOW;
1109                         } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) {
1110                                 /* fifo gets flushed later */
1111                                 ep->out_overflow = 1;
1112                                 DEBUG (ep->dev, "%s dma, discard %d len %d\n",
1113                                                 ep->ep.name, tmp,
1114                                                 req->req.length);
1115                                 req->req.status = -EOVERFLOW;
1116                         }
1117                 }
1118                 dma_done (ep, req, tmp, 0);
1119         }
1120 }
1121
1122 static void restart_dma (struct net2280_ep *ep)
1123 {
1124         struct net2280_request  *req;
1125         u32                     dmactl = dmactl_default;
1126
1127         if (ep->stopped)
1128                 return;
1129         req = list_entry (ep->queue.next, struct net2280_request, queue);
1130
1131         if (!use_dma_chaining) {
1132                 start_dma (ep, req);
1133                 return;
1134         }
1135
1136         /* the 2280 will be processing the queue unless queue hiccups after
1137          * the previous transfer:
1138          *  IN:   wanted automagic zlp, head doesn't (or vice versa)
1139          *        DMA_FIFO_VALIDATE doesn't init from dma descriptors.
1140          *  OUT:  was "usb-short", we must restart.
1141          */
1142         if (ep->is_in && !req->valid) {
1143                 struct net2280_request  *entry, *prev = NULL;
1144                 int                     reqmode, done = 0;
1145
1146                 DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td);
1147                 ep->in_fifo_validate = likely (req->req.zero
1148                         || (req->req.length % ep->ep.maxpacket) != 0);
1149                 if (ep->in_fifo_validate)
1150                         dmactl |= (1 << DMA_FIFO_VALIDATE);
1151                 list_for_each_entry (entry, &ep->queue, queue) {
1152                         __le32          dmacount;
1153
1154                         if (entry == req)
1155                                 continue;
1156                         dmacount = entry->td->dmacount;
1157                         if (!done) {
1158                                 reqmode = likely (entry->req.zero
1159                                         || (entry->req.length
1160                                                 % ep->ep.maxpacket) != 0);
1161                                 if (reqmode == ep->in_fifo_validate) {
1162                                         entry->valid = 1;
1163                                         dmacount |= valid_bit;
1164                                         entry->td->dmacount = dmacount;
1165                                         prev = entry;
1166                                         continue;
1167                                 } else {
1168                                         /* force a hiccup */
1169                                         prev->td->dmacount |= dma_done_ie;
1170                                         done = 1;
1171                                 }
1172                         }
1173
1174                         /* walk the rest of the queue so unlinks behave */
1175                         entry->valid = 0;
1176                         dmacount &= ~valid_bit;
1177                         entry->td->dmacount = dmacount;
1178                         prev = entry;
1179                 }
1180         }
1181
1182         writel (0, &ep->dma->dmactl);
1183         start_queue (ep, dmactl, req->td_dma);
1184 }
1185
1186 static void abort_dma (struct net2280_ep *ep)
1187 {
1188         /* abort the current transfer */
1189         if (likely (!list_empty (&ep->queue))) {
1190                 /* FIXME work around errata 0121, 0122, 0124 */
1191                 writel ((1 << DMA_ABORT), &ep->dma->dmastat);
1192                 spin_stop_dma (ep->dma);
1193         } else
1194                 stop_dma (ep->dma);
1195         scan_dma_completions (ep);
1196 }
1197
1198 /* dequeue ALL requests */
1199 static void nuke (struct net2280_ep *ep)
1200 {
1201         struct net2280_request  *req;
1202
1203         /* called with spinlock held */
1204         ep->stopped = 1;
1205         if (ep->dma)
1206                 abort_dma (ep);
1207         while (!list_empty (&ep->queue)) {
1208                 req = list_entry (ep->queue.next,
1209                                 struct net2280_request,
1210                                 queue);
1211                 done (ep, req, -ESHUTDOWN);
1212         }
1213 }
1214
1215 /* dequeue JUST ONE request */
1216 static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req)
1217 {
1218         struct net2280_ep       *ep;
1219         struct net2280_request  *req;
1220         unsigned long           flags;
1221         u32                     dmactl;
1222         int                     stopped;
1223
1224         ep = container_of (_ep, struct net2280_ep, ep);
1225         if (!_ep || (!ep->desc && ep->num != 0) || !_req)
1226                 return -EINVAL;
1227
1228         spin_lock_irqsave (&ep->dev->lock, flags);
1229         stopped = ep->stopped;
1230
1231         /* quiesce dma while we patch the queue */
1232         dmactl = 0;
1233         ep->stopped = 1;
1234         if (ep->dma) {
1235                 dmactl = readl (&ep->dma->dmactl);
1236                 /* WARNING erratum 0127 may kick in ... */
1237                 stop_dma (ep->dma);
1238                 scan_dma_completions (ep);
1239         }
1240
1241         /* make sure it's still queued on this endpoint */
1242         list_for_each_entry (req, &ep->queue, queue) {
1243                 if (&req->req == _req)
1244                         break;
1245         }
1246         if (&req->req != _req) {
1247                 spin_unlock_irqrestore (&ep->dev->lock, flags);
1248                 return -EINVAL;
1249         }
1250
1251         /* queue head may be partially complete. */
1252         if (ep->queue.next == &req->queue) {
1253                 if (ep->dma) {
1254                         DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name);
1255                         _req->status = -ECONNRESET;
1256                         abort_dma (ep);
1257                         if (likely (ep->queue.next == &req->queue)) {
1258                                 // NOTE: misreports single-transfer mode
1259                                 req->td->dmacount = 0;  /* invalidate */
1260                                 dma_done (ep, req,
1261                                         readl (&ep->dma->dmacount),
1262                                         -ECONNRESET);
1263                         }
1264                 } else {
1265                         DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name);
1266                         done (ep, req, -ECONNRESET);
1267                 }
1268                 req = NULL;
1269
1270         /* patch up hardware chaining data */
1271         } else if (ep->dma && use_dma_chaining) {
1272                 if (req->queue.prev == ep->queue.next) {
1273                         writel (le32_to_cpu (req->td->dmadesc),
1274                                 &ep->dma->dmadesc);
1275                         if (req->td->dmacount & dma_done_ie)
1276                                 writel (readl (&ep->dma->dmacount)
1277                                                 | le32_to_cpu(dma_done_ie),
1278                                         &ep->dma->dmacount);
1279                 } else {
1280                         struct net2280_request  *prev;
1281
1282                         prev = list_entry (req->queue.prev,
1283                                 struct net2280_request, queue);
1284                         prev->td->dmadesc = req->td->dmadesc;
1285                         if (req->td->dmacount & dma_done_ie)
1286                                 prev->td->dmacount |= dma_done_ie;
1287                 }
1288         }
1289
1290         if (req)
1291                 done (ep, req, -ECONNRESET);
1292         ep->stopped = stopped;
1293
1294         if (ep->dma) {
1295                 /* turn off dma on inactive queues */
1296                 if (list_empty (&ep->queue))
1297                         stop_dma (ep->dma);
1298                 else if (!ep->stopped) {
1299                         /* resume current request, or start new one */
1300                         if (req)
1301                                 writel (dmactl, &ep->dma->dmactl);
1302                         else
1303                                 start_dma (ep, list_entry (ep->queue.next,
1304                                         struct net2280_request, queue));
1305                 }
1306         }
1307
1308         spin_unlock_irqrestore (&ep->dev->lock, flags);
1309         return 0;
1310 }
1311
1312 /*-------------------------------------------------------------------------*/
1313
1314 static int net2280_fifo_status (struct usb_ep *_ep);
1315
1316 static int
1317 net2280_set_halt (struct usb_ep *_ep, int value)
1318 {
1319         struct net2280_ep       *ep;
1320         unsigned long           flags;
1321         int                     retval = 0;
1322
1323         ep = container_of (_ep, struct net2280_ep, ep);
1324         if (!_ep || (!ep->desc && ep->num != 0))
1325                 return -EINVAL;
1326         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1327                 return -ESHUTDOWN;
1328         if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1329                                                 == USB_ENDPOINT_XFER_ISOC)
1330                 return -EINVAL;
1331
1332         spin_lock_irqsave (&ep->dev->lock, flags);
1333         if (!list_empty (&ep->queue))
1334                 retval = -EAGAIN;
1335         else if (ep->is_in && value && net2280_fifo_status (_ep) != 0)
1336                 retval = -EAGAIN;
1337         else {
1338                 VDEBUG (ep->dev, "%s %s halt\n", _ep->name,
1339                                 value ? "set" : "clear");
1340                 /* set/clear, then synch memory views with the device */
1341                 if (value) {
1342                         if (ep->num == 0)
1343                                 ep->dev->protocol_stall = 1;
1344                         else
1345                                 set_halt (ep);
1346                 } else
1347                         clear_halt (ep);
1348                 (void) readl (&ep->regs->ep_rsp);
1349         }
1350         spin_unlock_irqrestore (&ep->dev->lock, flags);
1351
1352         return retval;
1353 }
1354
1355 static int
1356 net2280_fifo_status (struct usb_ep *_ep)
1357 {
1358         struct net2280_ep       *ep;
1359         u32                     avail;
1360
1361         ep = container_of (_ep, struct net2280_ep, ep);
1362         if (!_ep || (!ep->desc && ep->num != 0))
1363                 return -ENODEV;
1364         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1365                 return -ESHUTDOWN;
1366
1367         avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1);
1368         if (avail > ep->fifo_size)
1369                 return -EOVERFLOW;
1370         if (ep->is_in)
1371                 avail = ep->fifo_size - avail;
1372         return avail;
1373 }
1374
1375 static void
1376 net2280_fifo_flush (struct usb_ep *_ep)
1377 {
1378         struct net2280_ep       *ep;
1379
1380         ep = container_of (_ep, struct net2280_ep, ep);
1381         if (!_ep || (!ep->desc && ep->num != 0))
1382                 return;
1383         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1384                 return;
1385
1386         writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
1387         (void) readl (&ep->regs->ep_rsp);
1388 }
1389
1390 static const struct usb_ep_ops net2280_ep_ops = {
1391         .enable         = net2280_enable,
1392         .disable        = net2280_disable,
1393
1394         .alloc_request  = net2280_alloc_request,
1395         .free_request   = net2280_free_request,
1396
1397         .alloc_buffer   = net2280_alloc_buffer,
1398         .free_buffer    = net2280_free_buffer,
1399
1400         .queue          = net2280_queue,
1401         .dequeue        = net2280_dequeue,
1402
1403         .set_halt       = net2280_set_halt,
1404         .fifo_status    = net2280_fifo_status,
1405         .fifo_flush     = net2280_fifo_flush,
1406 };
1407
1408 /*-------------------------------------------------------------------------*/
1409
1410 static int net2280_get_frame (struct usb_gadget *_gadget)
1411 {
1412         struct net2280          *dev;
1413         unsigned long           flags;
1414         u16                     retval;
1415
1416         if (!_gadget)
1417                 return -ENODEV;
1418         dev = container_of (_gadget, struct net2280, gadget);
1419         spin_lock_irqsave (&dev->lock, flags);
1420         retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff;
1421         spin_unlock_irqrestore (&dev->lock, flags);
1422         return retval;
1423 }
1424
1425 static int net2280_wakeup (struct usb_gadget *_gadget)
1426 {
1427         struct net2280          *dev;
1428         u32                     tmp;
1429         unsigned long           flags;
1430
1431         if (!_gadget)
1432                 return 0;
1433         dev = container_of (_gadget, struct net2280, gadget);
1434
1435         spin_lock_irqsave (&dev->lock, flags);
1436         tmp = readl (&dev->usb->usbctl);
1437         if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE))
1438                 writel (1 << GENERATE_RESUME, &dev->usb->usbstat);
1439         spin_unlock_irqrestore (&dev->lock, flags);
1440
1441         /* pci writes may still be posted */
1442         return 0;
1443 }
1444
1445 static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value)
1446 {
1447         struct net2280          *dev;
1448         u32                     tmp;
1449         unsigned long           flags;
1450
1451         if (!_gadget)
1452                 return 0;
1453         dev = container_of (_gadget, struct net2280, gadget);
1454
1455         spin_lock_irqsave (&dev->lock, flags);
1456         tmp = readl (&dev->usb->usbctl);
1457         if (value)
1458                 tmp |= (1 << SELF_POWERED_STATUS);
1459         else
1460                 tmp &= ~(1 << SELF_POWERED_STATUS);
1461         writel (tmp, &dev->usb->usbctl);
1462         spin_unlock_irqrestore (&dev->lock, flags);
1463
1464         return 0;
1465 }
1466
1467 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1468 {
1469         struct net2280  *dev;
1470         u32             tmp;
1471         unsigned long   flags;
1472
1473         if (!_gadget)
1474                 return -ENODEV;
1475         dev = container_of (_gadget, struct net2280, gadget);
1476
1477         spin_lock_irqsave (&dev->lock, flags);
1478         tmp = readl (&dev->usb->usbctl);
1479         dev->softconnect = (is_on != 0);
1480         if (is_on)
1481                 tmp |= (1 << USB_DETECT_ENABLE);
1482         else
1483                 tmp &= ~(1 << USB_DETECT_ENABLE);
1484         writel (tmp, &dev->usb->usbctl);
1485         spin_unlock_irqrestore (&dev->lock, flags);
1486
1487         return 0;
1488 }
1489
1490 static const struct usb_gadget_ops net2280_ops = {
1491         .get_frame      = net2280_get_frame,
1492         .wakeup         = net2280_wakeup,
1493         .set_selfpowered = net2280_set_selfpowered,
1494         .pullup         = net2280_pullup,
1495 };
1496
1497 /*-------------------------------------------------------------------------*/
1498
1499 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1500
1501 /* FIXME move these into procfs, and use seq_file.
1502  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1503  * and also doesn't help products using this with 2.4 kernels.
1504  */
1505
1506 /* "function" sysfs attribute */
1507 static ssize_t
1508 show_function (struct device *_dev, struct device_attribute *attr, char *buf)
1509 {
1510         struct net2280  *dev = dev_get_drvdata (_dev);
1511
1512         if (!dev->driver
1513                         || !dev->driver->function
1514                         || strlen (dev->driver->function) > PAGE_SIZE)
1515                 return 0;
1516         return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function);
1517 }
1518 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
1519
1520 static ssize_t
1521 show_registers (struct device *_dev, struct device_attribute *attr, char *buf)
1522 {
1523         struct net2280          *dev;
1524         char                    *next;
1525         unsigned                size, t;
1526         unsigned long           flags;
1527         int                     i;
1528         u32                     t1, t2;
1529         const char              *s;
1530
1531         dev = dev_get_drvdata (_dev);
1532         next = buf;
1533         size = PAGE_SIZE;
1534         spin_lock_irqsave (&dev->lock, flags);
1535
1536         if (dev->driver)
1537                 s = dev->driver->driver.name;
1538         else
1539                 s = "(none)";
1540
1541         /* Main Control Registers */
1542         t = scnprintf (next, size, "%s version " DRIVER_VERSION
1543                         ", chiprev %04x, dma %s\n\n"
1544                         "devinit %03x fifoctl %08x gadget '%s'\n"
1545                         "pci irqenb0 %02x irqenb1 %08x "
1546                         "irqstat0 %04x irqstat1 %08x\n",
1547                         driver_name, dev->chiprev,
1548                         use_dma
1549                                 ? (use_dma_chaining ? "chaining" : "enabled")
1550                                 : "disabled",
1551                         readl (&dev->regs->devinit),
1552                         readl (&dev->regs->fifoctl),
1553                         s,
1554                         readl (&dev->regs->pciirqenb0),
1555                         readl (&dev->regs->pciirqenb1),
1556                         readl (&dev->regs->irqstat0),
1557                         readl (&dev->regs->irqstat1));
1558         size -= t;
1559         next += t;
1560
1561         /* USB Control Registers */
1562         t1 = readl (&dev->usb->usbctl);
1563         t2 = readl (&dev->usb->usbstat);
1564         if (t1 & (1 << VBUS_PIN)) {
1565                 if (t2 & (1 << HIGH_SPEED))
1566                         s = "high speed";
1567                 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1568                         s = "powered";
1569                 else
1570                         s = "full speed";
1571                 /* full speed bit (6) not working?? */
1572         } else
1573                         s = "not attached";
1574         t = scnprintf (next, size,
1575                         "stdrsp %08x usbctl %08x usbstat %08x "
1576                                 "addr 0x%02x (%s)\n",
1577                         readl (&dev->usb->stdrsp), t1, t2,
1578                         readl (&dev->usb->ouraddr), s);
1579         size -= t;
1580         next += t;
1581
1582         /* PCI Master Control Registers */
1583
1584         /* DMA Control Registers */
1585
1586         /* Configurable EP Control Registers */
1587         for (i = 0; i < 7; i++) {
1588                 struct net2280_ep       *ep;
1589
1590                 ep = &dev->ep [i];
1591                 if (i && !ep->desc)
1592                         continue;
1593
1594                 t1 = readl (&ep->regs->ep_cfg);
1595                 t2 = readl (&ep->regs->ep_rsp) & 0xff;
1596                 t = scnprintf (next, size,
1597                                 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1598                                         "irqenb %02x\n",
1599                                 ep->ep.name, t1, t2,
1600                                 (t2 & (1 << CLEAR_NAK_OUT_PACKETS))
1601                                         ? "NAK " : "",
1602                                 (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE))
1603                                         ? "hide " : "",
1604                                 (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR))
1605                                         ? "CRC " : "",
1606                                 (t2 & (1 << CLEAR_INTERRUPT_MODE))
1607                                         ? "interrupt " : "",
1608                                 (t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1609                                         ? "status " : "",
1610                                 (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE))
1611                                         ? "NAKmode " : "",
1612                                 (t2 & (1 << CLEAR_ENDPOINT_TOGGLE))
1613                                         ? "DATA1 " : "DATA0 ",
1614                                 (t2 & (1 << CLEAR_ENDPOINT_HALT))
1615                                         ? "HALT " : "",
1616                                 readl (&ep->regs->ep_irqenb));
1617                 size -= t;
1618                 next += t;
1619
1620                 t = scnprintf (next, size,
1621                                 "\tstat %08x avail %04x "
1622                                 "(ep%d%s-%s)%s\n",
1623                                 readl (&ep->regs->ep_stat),
1624                                 readl (&ep->regs->ep_avail),
1625                                 t1 & 0x0f, DIR_STRING (t1),
1626                                 type_string (t1 >> 8),
1627                                 ep->stopped ? "*" : "");
1628                 size -= t;
1629                 next += t;
1630
1631                 if (!ep->dma)
1632                         continue;
1633
1634                 t = scnprintf (next, size,
1635                                 "  dma\tctl %08x stat %08x count %08x\n"
1636                                 "\taddr %08x desc %08x\n",
1637                                 readl (&ep->dma->dmactl),
1638                                 readl (&ep->dma->dmastat),
1639                                 readl (&ep->dma->dmacount),
1640                                 readl (&ep->dma->dmaaddr),
1641                                 readl (&ep->dma->dmadesc));
1642                 size -= t;
1643                 next += t;
1644
1645         }
1646
1647         /* Indexed Registers */
1648                 // none yet
1649
1650         /* Statistics */
1651         t = scnprintf (next, size, "\nirqs:  ");
1652         size -= t;
1653         next += t;
1654         for (i = 0; i < 7; i++) {
1655                 struct net2280_ep       *ep;
1656
1657                 ep = &dev->ep [i];
1658                 if (i && !ep->irqs)
1659                         continue;
1660                 t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs);
1661                 size -= t;
1662                 next += t;
1663
1664         }
1665         t = scnprintf (next, size, "\n");
1666         size -= t;
1667         next += t;
1668
1669         spin_unlock_irqrestore (&dev->lock, flags);
1670
1671         return PAGE_SIZE - size;
1672 }
1673 static DEVICE_ATTR (registers, S_IRUGO, show_registers, NULL);
1674
1675 static ssize_t
1676 show_queues (struct device *_dev, struct device_attribute *attr, char *buf)
1677 {
1678         struct net2280          *dev;
1679         char                    *next;
1680         unsigned                size;
1681         unsigned long           flags;
1682         int                     i;
1683
1684         dev = dev_get_drvdata (_dev);
1685         next = buf;
1686         size = PAGE_SIZE;
1687         spin_lock_irqsave (&dev->lock, flags);
1688
1689         for (i = 0; i < 7; i++) {
1690                 struct net2280_ep               *ep = &dev->ep [i];
1691                 struct net2280_request          *req;
1692                 int                             t;
1693
1694                 if (i != 0) {
1695                         const struct usb_endpoint_descriptor    *d;
1696
1697                         d = ep->desc;
1698                         if (!d)
1699                                 continue;
1700                         t = d->bEndpointAddress;
1701                         t = scnprintf (next, size,
1702                                 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1703                                 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1704                                 (t & USB_DIR_IN) ? "in" : "out",
1705                                 ({ char *val;
1706                                  switch (d->bmAttributes & 0x03) {
1707                                  case USB_ENDPOINT_XFER_BULK:
1708                                         val = "bulk"; break;
1709                                  case USB_ENDPOINT_XFER_INT:
1710                                         val = "intr"; break;
1711                                  default:
1712                                         val = "iso"; break;
1713                                  }; val; }),
1714                                 le16_to_cpu (d->wMaxPacketSize) & 0x1fff,
1715                                 ep->dma ? "dma" : "pio", ep->fifo_size
1716                                 );
1717                 } else /* ep0 should only have one transfer queued */
1718                         t = scnprintf (next, size, "ep0 max 64 pio %s\n",
1719                                         ep->is_in ? "in" : "out");
1720                 if (t <= 0 || t > size)
1721                         goto done;
1722                 size -= t;
1723                 next += t;
1724
1725                 if (list_empty (&ep->queue)) {
1726                         t = scnprintf (next, size, "\t(nothing queued)\n");
1727                         if (t <= 0 || t > size)
1728                                 goto done;
1729                         size -= t;
1730                         next += t;
1731                         continue;
1732                 }
1733                 list_for_each_entry (req, &ep->queue, queue) {
1734                         if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc))
1735                                 t = scnprintf (next, size,
1736                                         "\treq %p len %d/%d "
1737                                         "buf %p (dmacount %08x)\n",
1738                                         &req->req, req->req.actual,
1739                                         req->req.length, req->req.buf,
1740                                         readl (&ep->dma->dmacount));
1741                         else
1742                                 t = scnprintf (next, size,
1743                                         "\treq %p len %d/%d buf %p\n",
1744                                         &req->req, req->req.actual,
1745                                         req->req.length, req->req.buf);
1746                         if (t <= 0 || t > size)
1747                                 goto done;
1748                         size -= t;
1749                         next += t;
1750
1751                         if (ep->dma) {
1752                                 struct net2280_dma      *td;
1753
1754                                 td = req->td;
1755                                 t = scnprintf (next, size, "\t    td %08x "
1756                                         " count %08x buf %08x desc %08x\n",
1757                                         (u32) req->td_dma,
1758                                         le32_to_cpu (td->dmacount),
1759                                         le32_to_cpu (td->dmaaddr),
1760                                         le32_to_cpu (td->dmadesc));
1761                                 if (t <= 0 || t > size)
1762                                         goto done;
1763                                 size -= t;
1764                                 next += t;
1765                         }
1766                 }
1767         }
1768
1769 done:
1770         spin_unlock_irqrestore (&dev->lock, flags);
1771         return PAGE_SIZE - size;
1772 }
1773 static DEVICE_ATTR (queues, S_IRUGO, show_queues, NULL);
1774
1775
1776 #else
1777
1778 #define device_create_file(a,b) (0)
1779 #define device_remove_file(a,b) do { } while (0)
1780
1781 #endif
1782
1783 /*-------------------------------------------------------------------------*/
1784
1785 /* another driver-specific mode might be a request type doing dma
1786  * to/from another device fifo instead of to/from memory.
1787  */
1788
1789 static void set_fifo_mode (struct net2280 *dev, int mode)
1790 {
1791         /* keeping high bits preserves BAR2 */
1792         writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1793
1794         /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1795         INIT_LIST_HEAD (&dev->gadget.ep_list);
1796         list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list);
1797         list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list);
1798         switch (mode) {
1799         case 0:
1800                 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1801                 list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list);
1802                 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024;
1803                 break;
1804         case 1:
1805                 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048;
1806                 break;
1807         case 2:
1808                 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1809                 dev->ep [1].fifo_size = 2048;
1810                 dev->ep [2].fifo_size = 1024;
1811                 break;
1812         }
1813         /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1814         list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list);
1815         list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list);
1816 }
1817
1818 /* just declare this in any driver that really need it */
1819 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
1820
1821 /**
1822  * net2280_set_fifo_mode - change allocation of fifo buffers
1823  * @gadget: access to the net2280 device that will be updated
1824  * @mode: 0 for default, four 1kB buffers (ep-a through ep-d);
1825  *      1 for two 2kB buffers (ep-a and ep-b only);
1826  *      2 for one 2kB buffer (ep-a) and two 1kB ones (ep-b, ep-c).
1827  *
1828  * returns zero on success, else negative errno.  when this succeeds,
1829  * the contents of gadget->ep_list may have changed.
1830  *
1831  * you may only call this function when endpoints a-d are all disabled.
1832  * use it whenever extra hardware buffering can help performance, such
1833  * as before enabling "high bandwidth" interrupt endpoints that use
1834  * maxpacket bigger than 512 (when double buffering would otherwise
1835  * be unavailable).
1836  */
1837 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
1838 {
1839         int                     i;
1840         struct net2280          *dev;
1841         int                     status = 0;
1842         unsigned long           flags;
1843
1844         if (!gadget)
1845                 return -ENODEV;
1846         dev = container_of (gadget, struct net2280, gadget);
1847
1848         spin_lock_irqsave (&dev->lock, flags);
1849
1850         for (i = 1; i <= 4; i++)
1851                 if (dev->ep [i].desc) {
1852                         status = -EINVAL;
1853                         break;
1854                 }
1855         if (mode < 0 || mode > 2)
1856                 status = -EINVAL;
1857         if (status == 0)
1858                 set_fifo_mode (dev, mode);
1859         spin_unlock_irqrestore (&dev->lock, flags);
1860
1861         if (status == 0) {
1862                 if (mode == 1)
1863                         DEBUG (dev, "fifo:  ep-a 2K, ep-b 2K\n");
1864                 else if (mode == 2)
1865                         DEBUG (dev, "fifo:  ep-a 2K, ep-b 1K, ep-c 1K\n");
1866                 /* else all are 1K */
1867         }
1868         return status;
1869 }
1870 EXPORT_SYMBOL (net2280_set_fifo_mode);
1871
1872 /*-------------------------------------------------------------------------*/
1873
1874 /* keeping it simple:
1875  * - one bus driver, initted first;
1876  * - one function driver, initted second
1877  *
1878  * most of the work to support multiple net2280 controllers would
1879  * be to associate this gadget driver (yes?) with all of them, or
1880  * perhaps to bind specific drivers to specific devices.
1881  */
1882
1883 static struct net2280   *the_controller;
1884
1885 static void usb_reset (struct net2280 *dev)
1886 {
1887         u32     tmp;
1888
1889         dev->gadget.speed = USB_SPEED_UNKNOWN;
1890         (void) readl (&dev->usb->usbctl);
1891
1892         net2280_led_init (dev);
1893
1894         /* disable automatic responses, and irqs */
1895         writel (0, &dev->usb->stdrsp);
1896         writel (0, &dev->regs->pciirqenb0);
1897         writel (0, &dev->regs->pciirqenb1);
1898
1899         /* clear old dma and irq state */
1900         for (tmp = 0; tmp < 4; tmp++) {
1901                 struct net2280_ep       *ep = &dev->ep [tmp + 1];
1902
1903                 if (ep->dma)
1904                         abort_dma (ep);
1905         }
1906         writel (~0, &dev->regs->irqstat0),
1907         writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
1908
1909         /* reset, and enable pci */
1910         tmp = readl (&dev->regs->devinit)
1911                 | (1 << PCI_ENABLE)
1912                 | (1 << FIFO_SOFT_RESET)
1913                 | (1 << USB_SOFT_RESET)
1914                 | (1 << M8051_RESET);
1915         writel (tmp, &dev->regs->devinit);
1916
1917         /* standard fifo and endpoint allocations */
1918         set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0);
1919 }
1920
1921 static void usb_reinit (struct net2280 *dev)
1922 {
1923         u32     tmp;
1924         int     init_dma;
1925
1926         /* use_dma changes are ignored till next device re-init */
1927         init_dma = use_dma;
1928
1929         /* basic endpoint init */
1930         for (tmp = 0; tmp < 7; tmp++) {
1931                 struct net2280_ep       *ep = &dev->ep [tmp];
1932
1933                 ep->ep.name = ep_name [tmp];
1934                 ep->dev = dev;
1935                 ep->num = tmp;
1936
1937                 if (tmp > 0 && tmp <= 4) {
1938                         ep->fifo_size = 1024;
1939                         if (init_dma)
1940                                 ep->dma = &dev->dma [tmp - 1];
1941                 } else
1942                         ep->fifo_size = 64;
1943                 ep->regs = &dev->epregs [tmp];
1944                 ep_reset (dev->regs, ep);
1945         }
1946         dev->ep [0].ep.maxpacket = 64;
1947         dev->ep [5].ep.maxpacket = 64;
1948         dev->ep [6].ep.maxpacket = 64;
1949
1950         dev->gadget.ep0 = &dev->ep [0].ep;
1951         dev->ep [0].stopped = 0;
1952         INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1953
1954         /* we want to prevent lowlevel/insecure access from the USB host,
1955          * but erratum 0119 means this enable bit is ignored
1956          */
1957         for (tmp = 0; tmp < 5; tmp++)
1958                 writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg);
1959 }
1960
1961 static void ep0_start (struct net2280 *dev)
1962 {
1963         writel (  (1 << CLEAR_EP_HIDE_STATUS_PHASE)
1964                 | (1 << CLEAR_NAK_OUT_PACKETS)
1965                 | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
1966                 , &dev->epregs [0].ep_rsp);
1967
1968         /*
1969          * hardware optionally handles a bunch of standard requests
1970          * that the API hides from drivers anyway.  have it do so.
1971          * endpoint status/features are handled in software, to
1972          * help pass tests for some dubious behavior.
1973          */
1974         writel (  (1 << SET_TEST_MODE)
1975                 | (1 << SET_ADDRESS)
1976                 | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP)
1977                 | (1 << GET_DEVICE_STATUS)
1978                 | (1 << GET_INTERFACE_STATUS)
1979                 , &dev->usb->stdrsp);
1980         writel (  (1 << USB_ROOT_PORT_WAKEUP_ENABLE)
1981                 | (1 << SELF_POWERED_USB_DEVICE)
1982                 | (1 << REMOTE_WAKEUP_SUPPORT)
1983                 | (dev->softconnect << USB_DETECT_ENABLE)
1984                 | (1 << SELF_POWERED_STATUS)
1985                 , &dev->usb->usbctl);
1986
1987         /* enable irqs so we can see ep0 and general operation  */
1988         writel (  (1 << SETUP_PACKET_INTERRUPT_ENABLE)
1989                 | (1 << ENDPOINT_0_INTERRUPT_ENABLE)
1990                 , &dev->regs->pciirqenb0);
1991         writel (  (1 << PCI_INTERRUPT_ENABLE)
1992                 | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE)
1993                 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE)
1994                 | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE)
1995                 | (1 << VBUS_INTERRUPT_ENABLE)
1996                 | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE)
1997                 | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE)
1998                 , &dev->regs->pciirqenb1);
1999
2000         /* don't leave any writes posted */
2001         (void) readl (&dev->usb->usbctl);
2002 }
2003
2004 /* when a driver is successfully registered, it will receive
2005  * control requests including set_configuration(), which enables
2006  * non-control requests.  then usb traffic follows until a
2007  * disconnect is reported.  then a host may connect again, or
2008  * the driver might get unbound.
2009  */
2010 int usb_gadget_register_driver (struct usb_gadget_driver *driver)
2011 {
2012         struct net2280          *dev = the_controller;
2013         int                     retval;
2014         unsigned                i;
2015
2016         /* insist on high speed support from the driver, since
2017          * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2018          * "must not be used in normal operation"
2019          */
2020         if (!driver
2021                         || driver->speed != USB_SPEED_HIGH
2022                         || !driver->bind
2023                         || !driver->setup)
2024                 return -EINVAL;
2025         if (!dev)
2026                 return -ENODEV;
2027         if (dev->driver)
2028                 return -EBUSY;
2029
2030         for (i = 0; i < 7; i++)
2031                 dev->ep [i].irqs = 0;
2032
2033         /* hook up the driver ... */
2034         dev->softconnect = 1;
2035         driver->driver.bus = NULL;
2036         dev->driver = driver;
2037         dev->gadget.dev.driver = &driver->driver;
2038         retval = driver->bind (&dev->gadget);
2039         if (retval) {
2040                 DEBUG (dev, "bind to driver %s --> %d\n",
2041                                 driver->driver.name, retval);
2042                 dev->driver = NULL;
2043                 dev->gadget.dev.driver = NULL;
2044                 return retval;
2045         }
2046
2047         retval = device_create_file (&dev->pdev->dev, &dev_attr_function);
2048         if (retval) goto err_unbind;
2049         retval = device_create_file (&dev->pdev->dev, &dev_attr_queues);
2050         if (retval) goto err_func;
2051
2052         /* ... then enable host detection and ep0; and we're ready
2053          * for set_configuration as well as eventual disconnect.
2054          */
2055         net2280_led_active (dev, 1);
2056         ep0_start (dev);
2057
2058         DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n",
2059                         driver->driver.name,
2060                         readl (&dev->usb->usbctl),
2061                         readl (&dev->usb->stdrsp));
2062
2063         /* pci writes may still be posted */
2064         return 0;
2065
2066 err_func:
2067         device_remove_file (&dev->pdev->dev, &dev_attr_function);
2068 err_unbind:
2069         driver->unbind (&dev->gadget);
2070         dev->gadget.dev.driver = NULL;
2071         dev->driver = NULL;
2072         return retval;
2073 }
2074 EXPORT_SYMBOL (usb_gadget_register_driver);
2075
2076 static void
2077 stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver)
2078 {
2079         int                     i;
2080
2081         /* don't disconnect if it's not connected */
2082         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2083                 driver = NULL;
2084
2085         /* stop hardware; prevent new request submissions;
2086          * and kill any outstanding requests.
2087          */
2088         usb_reset (dev);
2089         for (i = 0; i < 7; i++)
2090                 nuke (&dev->ep [i]);
2091
2092         /* report disconnect; the driver is already quiesced */
2093         if (driver) {
2094                 spin_unlock (&dev->lock);
2095                 driver->disconnect (&dev->gadget);
2096                 spin_lock (&dev->lock);
2097         }
2098
2099         usb_reinit (dev);
2100 }
2101
2102 int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
2103 {
2104         struct net2280  *dev = the_controller;
2105         unsigned long   flags;
2106
2107         if (!dev)
2108                 return -ENODEV;
2109         if (!driver || driver != dev->driver || !driver->unbind)
2110                 return -EINVAL;
2111
2112         spin_lock_irqsave (&dev->lock, flags);
2113         stop_activity (dev, driver);
2114         spin_unlock_irqrestore (&dev->lock, flags);
2115
2116         net2280_pullup (&dev->gadget, 0);
2117
2118         driver->unbind (&dev->gadget);
2119         dev->gadget.dev.driver = NULL;
2120         dev->driver = NULL;
2121
2122         net2280_led_active (dev, 0);
2123         device_remove_file (&dev->pdev->dev, &dev_attr_function);
2124         device_remove_file (&dev->pdev->dev, &dev_attr_queues);
2125
2126         DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name);
2127         return 0;
2128 }
2129 EXPORT_SYMBOL (usb_gadget_unregister_driver);
2130
2131
2132 /*-------------------------------------------------------------------------*/
2133
2134 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2135  * also works for dma-capable endpoints, in pio mode or just
2136  * to manually advance the queue after short OUT transfers.
2137  */
2138 static void handle_ep_small (struct net2280_ep *ep)
2139 {
2140         struct net2280_request  *req;
2141         u32                     t;
2142         /* 0 error, 1 mid-data, 2 done */
2143         int                     mode = 1;
2144
2145         if (!list_empty (&ep->queue))
2146                 req = list_entry (ep->queue.next,
2147                         struct net2280_request, queue);
2148         else
2149                 req = NULL;
2150
2151         /* ack all, and handle what we care about */
2152         t = readl (&ep->regs->ep_stat);
2153         ep->irqs++;
2154 #if 0
2155         VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n",
2156                         ep->ep.name, t, req ? &req->req : 0);
2157 #endif
2158         if (!ep->is_in || ep->dev->pdev->device == 0x2280)
2159                 writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat);
2160         else
2161                 /* Added for 2282 */
2162                 writel (t, &ep->regs->ep_stat);
2163
2164         /* for ep0, monitor token irqs to catch data stage length errors
2165          * and to synchronize on status.
2166          *
2167          * also, to defer reporting of protocol stalls ... here's where
2168          * data or status first appears, handling stalls here should never
2169          * cause trouble on the host side..
2170          *
2171          * control requests could be slightly faster without token synch for
2172          * status, but status can jam up that way.
2173          */
2174         if (unlikely (ep->num == 0)) {
2175                 if (ep->is_in) {
2176                         /* status; stop NAKing */
2177                         if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) {
2178                                 if (ep->dev->protocol_stall) {
2179                                         ep->stopped = 1;
2180                                         set_halt (ep);
2181                                 }
2182                                 if (!req)
2183                                         allow_status (ep);
2184                                 mode = 2;
2185                         /* reply to extra IN data tokens with a zlp */
2186                         } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2187                                 if (ep->dev->protocol_stall) {
2188                                         ep->stopped = 1;
2189                                         set_halt (ep);
2190                                         mode = 2;
2191                                 } else if (ep->responded &&
2192                                                 !req && !ep->stopped)
2193                                         write_fifo (ep, NULL);
2194                         }
2195                 } else {
2196                         /* status; stop NAKing */
2197                         if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2198                                 if (ep->dev->protocol_stall) {
2199                                         ep->stopped = 1;
2200                                         set_halt (ep);
2201                                 }
2202                                 mode = 2;
2203                         /* an extra OUT token is an error */
2204                         } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT))
2205                                         && req
2206                                         && req->req.actual == req->req.length)
2207                                         || (ep->responded && !req)) {
2208                                 ep->dev->protocol_stall = 1;
2209                                 set_halt (ep);
2210                                 ep->stopped = 1;
2211                                 if (req)
2212                                         done (ep, req, -EOVERFLOW);
2213                                 req = NULL;
2214                         }
2215                 }
2216         }
2217
2218         if (unlikely (!req))
2219                 return;
2220
2221         /* manual DMA queue advance after short OUT */
2222         if (likely (ep->dma != 0)) {
2223                 if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2224                         u32     count;
2225                         int     stopped = ep->stopped;
2226
2227                         /* TRANSFERRED works around OUT_DONE erratum 0112.
2228                          * we expect (N <= maxpacket) bytes; host wrote M.
2229                          * iff (M < N) we won't ever see a DMA interrupt.
2230                          */
2231                         ep->stopped = 1;
2232                         for (count = 0; ; t = readl (&ep->regs->ep_stat)) {
2233
2234                                 /* any preceding dma transfers must finish.
2235                                  * dma handles (M >= N), may empty the queue
2236                                  */
2237                                 scan_dma_completions (ep);
2238                                 if (unlikely (list_empty (&ep->queue)
2239                                                 || ep->out_overflow)) {
2240                                         req = NULL;
2241                                         break;
2242                                 }
2243                                 req = list_entry (ep->queue.next,
2244                                         struct net2280_request, queue);
2245
2246                                 /* here either (M < N), a "real" short rx;
2247                                  * or (M == N) and the queue didn't empty
2248                                  */
2249                                 if (likely (t & (1 << FIFO_EMPTY))) {
2250                                         count = readl (&ep->dma->dmacount);
2251                                         count &= DMA_BYTE_COUNT_MASK;
2252                                         if (readl (&ep->dma->dmadesc)
2253                                                         != req->td_dma)
2254                                                 req = NULL;
2255                                         break;
2256                                 }
2257                                 udelay(1);
2258                         }
2259
2260                         /* stop DMA, leave ep NAKing */
2261                         writel ((1 << DMA_ABORT), &ep->dma->dmastat);
2262                         spin_stop_dma (ep->dma);
2263
2264                         if (likely (req)) {
2265                                 req->td->dmacount = 0;
2266                                 t = readl (&ep->regs->ep_avail);
2267                                 dma_done (ep, req, count,
2268                                         (ep->out_overflow || t)
2269                                                 ? -EOVERFLOW : 0);
2270                         }
2271
2272                         /* also flush to prevent erratum 0106 trouble */
2273                         if (unlikely (ep->out_overflow
2274                                         || (ep->dev->chiprev == 0x0100
2275                                                 && ep->dev->gadget.speed
2276                                                         == USB_SPEED_FULL))) {
2277                                 out_flush (ep);
2278                                 ep->out_overflow = 0;
2279                         }
2280
2281                         /* (re)start dma if needed, stop NAKing */
2282                         ep->stopped = stopped;
2283                         if (!list_empty (&ep->queue))
2284                                 restart_dma (ep);
2285                 } else
2286                         DEBUG (ep->dev, "%s dma ep_stat %08x ??\n",
2287                                         ep->ep.name, t);
2288                 return;
2289
2290         /* data packet(s) received (in the fifo, OUT) */
2291         } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) {
2292                 if (read_fifo (ep, req) && ep->num != 0)
2293                         mode = 2;
2294
2295         /* data packet(s) transmitted (IN) */
2296         } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2297                 unsigned        len;
2298
2299                 len = req->req.length - req->req.actual;
2300                 if (len > ep->ep.maxpacket)
2301                         len = ep->ep.maxpacket;
2302                 req->req.actual += len;
2303
2304                 /* if we wrote it all, we're usually done */
2305                 if (req->req.actual == req->req.length) {
2306                         if (ep->num == 0) {
2307                                 /* send zlps until the status stage */
2308                         } else if (!req->req.zero || len != ep->ep.maxpacket)
2309                                 mode = 2;
2310                 }
2311
2312         /* there was nothing to do ...  */
2313         } else if (mode == 1)
2314                 return;
2315
2316         /* done */
2317         if (mode == 2) {
2318                 /* stream endpoints often resubmit/unlink in completion */
2319                 done (ep, req, 0);
2320
2321                 /* maybe advance queue to next request */
2322                 if (ep->num == 0) {
2323                         /* NOTE:  net2280 could let gadget driver start the
2324                          * status stage later. since not all controllers let
2325                          * them control that, the api doesn't (yet) allow it.
2326                          */
2327                         if (!ep->stopped)
2328                                 allow_status (ep);
2329                         req = NULL;
2330                 } else {
2331                         if (!list_empty (&ep->queue) && !ep->stopped)
2332                                 req = list_entry (ep->queue.next,
2333                                         struct net2280_request, queue);
2334                         else
2335                                 req = NULL;
2336                         if (req && !ep->is_in)
2337                                 stop_out_naking (ep);
2338                 }
2339         }
2340
2341         /* is there a buffer for the next packet?
2342          * for best streaming performance, make sure there is one.
2343          */
2344         if (req && !ep->stopped) {
2345
2346                 /* load IN fifo with next packet (may be zlp) */
2347                 if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT))
2348                         write_fifo (ep, &req->req);
2349         }
2350 }
2351
2352 static struct net2280_ep *
2353 get_ep_by_addr (struct net2280 *dev, u16 wIndex)
2354 {
2355         struct net2280_ep       *ep;
2356
2357         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2358                 return &dev->ep [0];
2359         list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) {
2360                 u8      bEndpointAddress;
2361
2362                 if (!ep->desc)
2363                         continue;
2364                 bEndpointAddress = ep->desc->bEndpointAddress;
2365                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2366                         continue;
2367                 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2368                         return ep;
2369         }
2370         return NULL;
2371 }
2372
2373 static void handle_stat0_irqs (struct net2280 *dev, u32 stat)
2374 {
2375         struct net2280_ep       *ep;
2376         u32                     num, scratch;
2377
2378         /* most of these don't need individual acks */
2379         stat &= ~(1 << INTA_ASSERTED);
2380         if (!stat)
2381                 return;
2382         // DEBUG (dev, "irqstat0 %04x\n", stat);
2383
2384         /* starting a control request? */
2385         if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) {
2386                 union {
2387                         u32                     raw [2];
2388                         struct usb_ctrlrequest  r;
2389                 } u;
2390                 int                             tmp;
2391                 struct net2280_request          *req;
2392
2393                 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
2394                         if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED))
2395                                 dev->gadget.speed = USB_SPEED_HIGH;
2396                         else
2397                                 dev->gadget.speed = USB_SPEED_FULL;
2398                         net2280_led_speed (dev, dev->gadget.speed);
2399                         DEBUG (dev, "%s speed\n",
2400                                 (dev->gadget.speed == USB_SPEED_HIGH)
2401                                         ? "high" : "full");
2402                 }
2403
2404                 ep = &dev->ep [0];
2405                 ep->irqs++;
2406
2407                 /* make sure any leftover request state is cleared */
2408                 stat &= ~(1 << ENDPOINT_0_INTERRUPT);
2409                 while (!list_empty (&ep->queue)) {
2410                         req = list_entry (ep->queue.next,
2411                                         struct net2280_request, queue);
2412                         done (ep, req, (req->req.actual == req->req.length)
2413                                                 ? 0 : -EPROTO);
2414                 }
2415                 ep->stopped = 0;
2416                 dev->protocol_stall = 0;
2417
2418                 if (ep->dev->pdev->device == 0x2280)
2419                         tmp = (1 << FIFO_OVERFLOW)
2420                                 | (1 << FIFO_UNDERFLOW);
2421                 else
2422                         tmp = 0;
2423
2424                 writel (tmp | (1 << TIMEOUT)
2425                         | (1 << USB_STALL_SENT)
2426                         | (1 << USB_IN_NAK_SENT)
2427                         | (1 << USB_IN_ACK_RCVD)
2428                         | (1 << USB_OUT_PING_NAK_SENT)
2429                         | (1 << USB_OUT_ACK_SENT)
2430                         | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
2431                         | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
2432                         | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2433                         | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2434                         | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2435                         | (1 << DATA_IN_TOKEN_INTERRUPT)
2436                         , &ep->regs->ep_stat);
2437                 u.raw [0] = readl (&dev->usb->setup0123);
2438                 u.raw [1] = readl (&dev->usb->setup4567);
2439
2440                 cpu_to_le32s (&u.raw [0]);
2441                 cpu_to_le32s (&u.raw [1]);
2442
2443                 tmp = 0;
2444
2445 #define w_value         le16_to_cpup (&u.r.wValue)
2446 #define w_index         le16_to_cpup (&u.r.wIndex)
2447 #define w_length        le16_to_cpup (&u.r.wLength)
2448
2449                 /* ack the irq */
2450                 writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0);
2451                 stat ^= (1 << SETUP_PACKET_INTERRUPT);
2452
2453                 /* watch control traffic at the token level, and force
2454                  * synchronization before letting the status stage happen.
2455                  * FIXME ignore tokens we'll NAK, until driver responds.
2456                  * that'll mean a lot less irqs for some drivers.
2457                  */
2458                 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
2459                 if (ep->is_in) {
2460                         scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2461                                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2462                                 | (1 << DATA_IN_TOKEN_INTERRUPT);
2463                         stop_out_naking (ep);
2464                 } else
2465                         scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2466                                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2467                                 | (1 << DATA_IN_TOKEN_INTERRUPT);
2468                 writel (scratch, &dev->epregs [0].ep_irqenb);
2469
2470                 /* we made the hardware handle most lowlevel requests;
2471                  * everything else goes uplevel to the gadget code.
2472                  */
2473                 ep->responded = 1;
2474                 switch (u.r.bRequest) {
2475                 case USB_REQ_GET_STATUS: {
2476                         struct net2280_ep       *e;
2477                         __le32                  status;
2478
2479                         /* hw handles device and interface status */
2480                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
2481                                 goto delegate;
2482                         if ((e = get_ep_by_addr (dev, w_index)) == 0
2483                                         || w_length > 2)
2484                                 goto do_stall;
2485
2486                         if (readl (&e->regs->ep_rsp)
2487                                         & (1 << SET_ENDPOINT_HALT))
2488                                 status = __constant_cpu_to_le32 (1);
2489                         else
2490                                 status = __constant_cpu_to_le32 (0);
2491
2492                         /* don't bother with a request object! */
2493                         writel (0, &dev->epregs [0].ep_irqenb);
2494                         set_fifo_bytecount (ep, w_length);
2495                         writel ((__force u32)status, &dev->epregs [0].ep_data);
2496                         allow_status (ep);
2497                         VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status);
2498                         goto next_endpoints;
2499                         }
2500                         break;
2501                 case USB_REQ_CLEAR_FEATURE: {
2502                         struct net2280_ep       *e;
2503
2504                         /* hw handles device features */
2505                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2506                                 goto delegate;
2507                         if (w_value != USB_ENDPOINT_HALT
2508                                         || w_length != 0)
2509                                 goto do_stall;
2510                         if ((e = get_ep_by_addr (dev, w_index)) == 0)
2511                                 goto do_stall;
2512                         clear_halt (e);
2513                         allow_status (ep);
2514                         VDEBUG (dev, "%s clear halt\n", ep->ep.name);
2515                         goto next_endpoints;
2516                         }
2517                         break;
2518                 case USB_REQ_SET_FEATURE: {
2519                         struct net2280_ep       *e;
2520
2521                         /* hw handles device features */
2522                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2523                                 goto delegate;
2524                         if (w_value != USB_ENDPOINT_HALT
2525                                         || w_length != 0)
2526                                 goto do_stall;
2527                         if ((e = get_ep_by_addr (dev, w_index)) == 0)
2528                                 goto do_stall;
2529                         set_halt (e);
2530                         allow_status (ep);
2531                         VDEBUG (dev, "%s set halt\n", ep->ep.name);
2532                         goto next_endpoints;
2533                         }
2534                         break;
2535                 default:
2536 delegate:
2537                         VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x"
2538                                 "ep_cfg %08x\n",
2539                                 u.r.bRequestType, u.r.bRequest,
2540                                 w_value, w_index, w_length,
2541                                 readl (&ep->regs->ep_cfg));
2542                         ep->responded = 0;
2543                         spin_unlock (&dev->lock);
2544                         tmp = dev->driver->setup (&dev->gadget, &u.r);
2545                         spin_lock (&dev->lock);
2546                 }
2547
2548                 /* stall ep0 on error */
2549                 if (tmp < 0) {
2550 do_stall:
2551                         VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n",
2552                                         u.r.bRequestType, u.r.bRequest, tmp);
2553                         dev->protocol_stall = 1;
2554                 }
2555
2556                 /* some in/out token irq should follow; maybe stall then.
2557                  * driver must queue a request (even zlp) or halt ep0
2558                  * before the host times out.
2559                  */
2560         }
2561
2562 #undef  w_value
2563 #undef  w_index
2564 #undef  w_length
2565
2566 next_endpoints:
2567         /* endpoint data irq ? */
2568         scratch = stat & 0x7f;
2569         stat &= ~0x7f;
2570         for (num = 0; scratch; num++) {
2571                 u32             t;
2572
2573                 /* do this endpoint's FIFO and queue need tending? */
2574                 t = 1 << num;
2575                 if ((scratch & t) == 0)
2576                         continue;
2577                 scratch ^= t;
2578
2579                 ep = &dev->ep [num];
2580                 handle_ep_small (ep);
2581         }
2582
2583         if (stat)
2584                 DEBUG (dev, "unhandled irqstat0 %08x\n", stat);
2585 }
2586
2587 #define DMA_INTERRUPTS ( \
2588                   (1 << DMA_D_INTERRUPT) \
2589                 | (1 << DMA_C_INTERRUPT) \
2590                 | (1 << DMA_B_INTERRUPT) \
2591                 | (1 << DMA_A_INTERRUPT))
2592 #define PCI_ERROR_INTERRUPTS ( \
2593                   (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \
2594                 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \
2595                 | (1 << PCI_RETRY_ABORT_INTERRUPT))
2596
2597 static void handle_stat1_irqs (struct net2280 *dev, u32 stat)
2598 {
2599         struct net2280_ep       *ep;
2600         u32                     tmp, num, mask, scratch;
2601
2602         /* after disconnect there's nothing else to do! */
2603         tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT);
2604         mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED);
2605
2606         /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
2607          * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRRUPT set and
2608          * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
2609          * only indicates a change in the reset state).
2610          */
2611         if (stat & tmp) {
2612                 writel (tmp, &dev->regs->irqstat1);
2613                 if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT))
2614                                         && ((readl (&dev->usb->usbstat) & mask)
2615                                                         == 0))
2616                                 || ((readl (&dev->usb->usbctl)
2617                                         & (1 << VBUS_PIN)) == 0)
2618                             ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) {
2619                         DEBUG (dev, "disconnect %s\n",
2620                                         dev->driver->driver.name);
2621                         stop_activity (dev, dev->driver);
2622                         ep0_start (dev);
2623                         return;
2624                 }
2625                 stat &= ~tmp;
2626
2627                 /* vBUS can bounce ... one of many reasons to ignore the
2628                  * notion of hotplug events on bus connect/disconnect!
2629                  */
2630                 if (!stat)
2631                         return;
2632         }
2633
2634         /* NOTE: chip stays in PCI D0 state for now, but it could
2635          * enter D1 to save more power
2636          */
2637         tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT);
2638         if (stat & tmp) {
2639                 writel (tmp, &dev->regs->irqstat1);
2640                 if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) {
2641                         if (dev->driver->suspend)
2642                                 dev->driver->suspend (&dev->gadget);
2643                         if (!enable_suspend)
2644                                 stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT);
2645                 } else {
2646                         if (dev->driver->resume)
2647                                 dev->driver->resume (&dev->gadget);
2648                         /* at high speed, note erratum 0133 */
2649                 }
2650                 stat &= ~tmp;
2651         }
2652
2653         /* clear any other status/irqs */
2654         if (stat)
2655                 writel (stat, &dev->regs->irqstat1);
2656
2657         /* some status we can just ignore */
2658         if (dev->pdev->device == 0x2280)
2659                 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2660                           | (1 << SUSPEND_REQUEST_INTERRUPT)
2661                           | (1 << RESUME_INTERRUPT)
2662                           | (1 << SOF_INTERRUPT));
2663         else
2664                 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2665                           | (1 << RESUME_INTERRUPT)
2666                           | (1 << SOF_DOWN_INTERRUPT)
2667                           | (1 << SOF_INTERRUPT));
2668
2669         if (!stat)
2670                 return;
2671         // DEBUG (dev, "irqstat1 %08x\n", stat);
2672
2673         /* DMA status, for ep-{a,b,c,d} */
2674         scratch = stat & DMA_INTERRUPTS;
2675         stat &= ~DMA_INTERRUPTS;
2676         scratch >>= 9;
2677         for (num = 0; scratch; num++) {
2678                 struct net2280_dma_regs __iomem *dma;
2679
2680                 tmp = 1 << num;
2681                 if ((tmp & scratch) == 0)
2682                         continue;
2683                 scratch ^= tmp;
2684
2685                 ep = &dev->ep [num + 1];
2686                 dma = ep->dma;
2687
2688                 if (!dma)
2689                         continue;
2690
2691                 /* clear ep's dma status */
2692                 tmp = readl (&dma->dmastat);
2693                 writel (tmp, &dma->dmastat);
2694
2695                 /* chaining should stop on abort, short OUT from fifo,
2696                  * or (stat0 codepath) short OUT transfer.
2697                  */
2698                 if (!use_dma_chaining) {
2699                         if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT))
2700                                         == 0) {
2701                                 DEBUG (ep->dev, "%s no xact done? %08x\n",
2702                                         ep->ep.name, tmp);
2703                                 continue;
2704                         }
2705                         stop_dma (ep->dma);
2706                 }
2707
2708                 /* OUT transfers terminate when the data from the
2709                  * host is in our memory.  Process whatever's done.
2710                  * On this path, we know transfer's last packet wasn't
2711                  * less than req->length. NAK_OUT_PACKETS may be set,
2712                  * or the FIFO may already be holding new packets.
2713                  *
2714                  * IN transfers can linger in the FIFO for a very
2715                  * long time ... we ignore that for now, accounting
2716                  * precisely (like PIO does) needs per-packet irqs
2717                  */
2718                 scan_dma_completions (ep);
2719
2720                 /* disable dma on inactive queues; else maybe restart */
2721                 if (list_empty (&ep->queue)) {
2722                         if (use_dma_chaining)
2723                                 stop_dma (ep->dma);
2724                 } else {
2725                         tmp = readl (&dma->dmactl);
2726                         if (!use_dma_chaining
2727                                         || (tmp & (1 << DMA_ENABLE)) == 0)
2728                                 restart_dma (ep);
2729                         else if (ep->is_in && use_dma_chaining) {
2730                                 struct net2280_request  *req;
2731                                 __le32                  dmacount;
2732
2733                                 /* the descriptor at the head of the chain
2734                                  * may still have VALID_BIT clear; that's
2735                                  * used to trigger changing DMA_FIFO_VALIDATE
2736                                  * (affects automagic zlp writes).
2737                                  */
2738                                 req = list_entry (ep->queue.next,
2739                                                 struct net2280_request, queue);
2740                                 dmacount = req->td->dmacount;
2741                                 dmacount &= __constant_cpu_to_le32 (
2742                                                 (1 << VALID_BIT)
2743                                                 | DMA_BYTE_COUNT_MASK);
2744                                 if (dmacount && (dmacount & valid_bit) == 0)
2745                                         restart_dma (ep);
2746                         }
2747                 }
2748                 ep->irqs++;
2749         }
2750
2751         /* NOTE:  there are other PCI errors we might usefully notice.
2752          * if they appear very often, here's where to try recovering.
2753          */
2754         if (stat & PCI_ERROR_INTERRUPTS) {
2755                 ERROR (dev, "pci dma error; stat %08x\n", stat);
2756                 stat &= ~PCI_ERROR_INTERRUPTS;
2757                 /* these are fatal errors, but "maybe" they won't
2758                  * happen again ...
2759                  */
2760                 stop_activity (dev, dev->driver);
2761                 ep0_start (dev);
2762                 stat = 0;
2763         }
2764
2765         if (stat)
2766                 DEBUG (dev, "unhandled irqstat1 %08x\n", stat);
2767 }
2768
2769 static irqreturn_t net2280_irq (int irq, void *_dev)
2770 {
2771         struct net2280          *dev = _dev;
2772
2773         /* shared interrupt, not ours */
2774         if (!(readl(&dev->regs->irqstat0) & (1 << INTA_ASSERTED)))
2775                 return IRQ_NONE;
2776
2777         spin_lock (&dev->lock);
2778
2779         /* handle disconnect, dma, and more */
2780         handle_stat1_irqs (dev, readl (&dev->regs->irqstat1));
2781
2782         /* control requests and PIO */
2783         handle_stat0_irqs (dev, readl (&dev->regs->irqstat0));
2784
2785         spin_unlock (&dev->lock);
2786
2787         return IRQ_HANDLED;
2788 }
2789
2790 /*-------------------------------------------------------------------------*/
2791
2792 static void gadget_release (struct device *_dev)
2793 {
2794         struct net2280  *dev = dev_get_drvdata (_dev);
2795
2796         kfree (dev);
2797 }
2798
2799 /* tear down the binding between this driver and the pci device */
2800
2801 static void net2280_remove (struct pci_dev *pdev)
2802 {
2803         struct net2280          *dev = pci_get_drvdata (pdev);
2804
2805         BUG_ON(dev->driver);
2806
2807         /* then clean up the resources we allocated during probe() */
2808         net2280_led_shutdown (dev);
2809         if (dev->requests) {
2810                 int             i;
2811                 for (i = 1; i < 5; i++) {
2812                         if (!dev->ep [i].dummy)
2813                                 continue;
2814                         pci_pool_free (dev->requests, dev->ep [i].dummy,
2815                                         dev->ep [i].td_dma);
2816                 }
2817                 pci_pool_destroy (dev->requests);
2818         }
2819         if (dev->got_irq)
2820                 free_irq (pdev->irq, dev);
2821         if (dev->regs)
2822                 iounmap (dev->regs);
2823         if (dev->region)
2824                 release_mem_region (pci_resource_start (pdev, 0),
2825                                 pci_resource_len (pdev, 0));
2826         if (dev->enabled)
2827                 pci_disable_device (pdev);
2828         device_unregister (&dev->gadget.dev);
2829         device_remove_file (&pdev->dev, &dev_attr_registers);
2830         pci_set_drvdata (pdev, NULL);
2831
2832         INFO (dev, "unbind\n");
2833
2834         the_controller = NULL;
2835 }
2836
2837 /* wrap this driver around the specified device, but
2838  * don't respond over USB until a gadget driver binds to us.
2839  */
2840
2841 static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id)
2842 {
2843         struct net2280          *dev;
2844         unsigned long           resource, len;
2845         void                    __iomem *base = NULL;
2846         int                     retval, i;
2847
2848         /* if you want to support more than one controller in a system,
2849          * usb_gadget_driver_{register,unregister}() must change.
2850          */
2851         if (the_controller) {
2852                 dev_warn (&pdev->dev, "ignoring\n");
2853                 return -EBUSY;
2854         }
2855
2856         /* alloc, and start init */
2857         dev = kzalloc (sizeof *dev, GFP_KERNEL);
2858         if (dev == NULL){
2859                 retval = -ENOMEM;
2860                 goto done;
2861         }
2862
2863         pci_set_drvdata (pdev, dev);
2864         spin_lock_init (&dev->lock);
2865         dev->pdev = pdev;
2866         dev->gadget.ops = &net2280_ops;
2867         dev->gadget.is_dualspeed = 1;
2868
2869         /* the "gadget" abstracts/virtualizes the controller */
2870         strcpy (dev->gadget.dev.bus_id, "gadget");
2871         dev->gadget.dev.parent = &pdev->dev;
2872         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2873         dev->gadget.dev.release = gadget_release;
2874         dev->gadget.name = driver_name;
2875
2876         /* now all the pci goodies ... */
2877         if (pci_enable_device (pdev) < 0) {
2878                 retval = -ENODEV;
2879                 goto done;
2880         }
2881         dev->enabled = 1;
2882
2883         /* BAR 0 holds all the registers
2884          * BAR 1 is 8051 memory; unused here (note erratum 0103)
2885          * BAR 2 is fifo memory; unused here
2886          */
2887         resource = pci_resource_start (pdev, 0);
2888         len = pci_resource_len (pdev, 0);
2889         if (!request_mem_region (resource, len, driver_name)) {
2890                 DEBUG (dev, "controller already in use\n");
2891                 retval = -EBUSY;
2892                 goto done;
2893         }
2894         dev->region = 1;
2895
2896         /* FIXME provide firmware download interface to put
2897          * 8051 code into the chip, e.g. to turn on PCI PM.
2898          */
2899
2900         base = ioremap_nocache (resource, len);
2901         if (base == NULL) {
2902                 DEBUG (dev, "can't map memory\n");
2903                 retval = -EFAULT;
2904                 goto done;
2905         }
2906         dev->regs = (struct net2280_regs __iomem *) base;
2907         dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
2908         dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
2909         dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
2910         dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
2911         dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
2912
2913         /* put into initial config, link up all endpoints */
2914         writel (0, &dev->usb->usbctl);
2915         usb_reset (dev);
2916         usb_reinit (dev);
2917
2918         /* irq setup after old hardware is cleaned up */
2919         if (!pdev->irq) {
2920                 ERROR (dev, "No IRQ.  Check PCI setup!\n");
2921                 retval = -ENODEV;
2922                 goto done;
2923         }
2924
2925         if (request_irq (pdev->irq, net2280_irq, IRQF_SHARED, driver_name, dev)
2926                         != 0) {
2927                 ERROR (dev, "request interrupt %d failed\n", pdev->irq);
2928                 retval = -EBUSY;
2929                 goto done;
2930         }
2931         dev->got_irq = 1;
2932
2933         /* DMA setup */
2934         /* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
2935         dev->requests = pci_pool_create ("requests", pdev,
2936                 sizeof (struct net2280_dma),
2937                 0 /* no alignment requirements */,
2938                 0 /* or page-crossing issues */);
2939         if (!dev->requests) {
2940                 DEBUG (dev, "can't get request pool\n");
2941                 retval = -ENOMEM;
2942                 goto done;
2943         }
2944         for (i = 1; i < 5; i++) {
2945                 struct net2280_dma      *td;
2946
2947                 td = pci_pool_alloc (dev->requests, GFP_KERNEL,
2948                                 &dev->ep [i].td_dma);
2949                 if (!td) {
2950                         DEBUG (dev, "can't get dummy %d\n", i);
2951                         retval = -ENOMEM;
2952                         goto done;
2953                 }
2954                 td->dmacount = 0;       /* not VALID */
2955                 td->dmaaddr = __constant_cpu_to_le32 (DMA_ADDR_INVALID);
2956                 td->dmadesc = td->dmaaddr;
2957                 dev->ep [i].dummy = td;
2958         }
2959
2960         /* enable lower-overhead pci memory bursts during DMA */
2961         writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE)
2962                         // 256 write retries may not be enough...
2963                         // | (1 << PCI_RETRY_ABORT_ENABLE)
2964                         | (1 << DMA_READ_MULTIPLE_ENABLE)
2965                         | (1 << DMA_READ_LINE_ENABLE)
2966                         , &dev->pci->pcimstctl);
2967         /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
2968         pci_set_master (pdev);
2969         pci_set_mwi (pdev);
2970
2971         /* ... also flushes any posted pci writes */
2972         dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff;
2973
2974         /* done */
2975         INFO (dev, "%s\n", driver_desc);
2976         INFO (dev, "irq %d, pci mem %p, chip rev %04x\n",
2977                         pdev->irq, base, dev->chiprev);
2978         INFO (dev, "version: " DRIVER_VERSION "; dma %s\n",
2979                         use_dma
2980                                 ? (use_dma_chaining ? "chaining" : "enabled")
2981                                 : "disabled");
2982         the_controller = dev;
2983
2984         retval = device_register (&dev->gadget.dev);
2985         if (retval) goto done;
2986         retval = device_create_file (&pdev->dev, &dev_attr_registers);
2987         if (retval) goto done;
2988
2989         return 0;
2990
2991 done:
2992         if (dev)
2993                 net2280_remove (pdev);
2994         return retval;
2995 }
2996
2997 /* make sure the board is quiescent; otherwise it will continue
2998  * generating IRQs across the upcoming reboot.
2999  */
3000
3001 static void net2280_shutdown (struct pci_dev *pdev)
3002 {
3003         struct net2280          *dev = pci_get_drvdata (pdev);
3004
3005         /* disable IRQs */
3006         writel (0, &dev->regs->pciirqenb0);
3007         writel (0, &dev->regs->pciirqenb1);
3008
3009         /* disable the pullup so the host will think we're gone */
3010         writel (0, &dev->usb->usbctl);
3011 }
3012
3013
3014 /*-------------------------------------------------------------------------*/
3015
3016 static const struct pci_device_id pci_ids [] = { {
3017         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3018         .class_mask =   ~0,
3019         .vendor =       0x17cc,
3020         .device =       0x2280,
3021         .subvendor =    PCI_ANY_ID,
3022         .subdevice =    PCI_ANY_ID,
3023 }, {
3024         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3025         .class_mask =   ~0,
3026         .vendor =       0x17cc,
3027         .device =       0x2282,
3028         .subvendor =    PCI_ANY_ID,
3029         .subdevice =    PCI_ANY_ID,
3030
3031 }, { /* end: all zeroes */ }
3032 };
3033 MODULE_DEVICE_TABLE (pci, pci_ids);
3034
3035 /* pci driver glue; this is a "new style" PCI driver module */
3036 static struct pci_driver net2280_pci_driver = {
3037         .name =         (char *) driver_name,
3038         .id_table =     pci_ids,
3039
3040         .probe =        net2280_probe,
3041         .remove =       net2280_remove,
3042         .shutdown =     net2280_shutdown,
3043
3044         /* FIXME add power management support */
3045 };
3046
3047 MODULE_DESCRIPTION (DRIVER_DESC);
3048 MODULE_AUTHOR ("David Brownell");
3049 MODULE_LICENSE ("GPL");
3050
3051 static int __init init (void)
3052 {
3053         if (!use_dma)
3054                 use_dma_chaining = 0;
3055         return pci_register_driver (&net2280_pci_driver);
3056 }
3057 module_init (init);
3058
3059 static void __exit cleanup (void)
3060 {
3061         pci_unregister_driver (&net2280_pci_driver);
3062 }
3063 module_exit (cleanup);