header cleaning: don't include smp_lock.h when not used
[sfrench/cifs-2.6.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/slab.h>
57 #include <linux/errno.h>
58 #include <linux/init.h>
59 #include <linux/timer.h>
60 #include <linux/list.h>
61 #include <linux/interrupt.h>
62 #include <linux/moduleparam.h>
63 #include <linux/device.h>
64 #include <linux/usb/ch9.h>
65 #include <linux/usb_gadget.h>
66
67 #include <asm/byteorder.h>
68 #include <asm/io.h>
69 #include <asm/irq.h>
70 #include <asm/system.h>
71 #include <asm/unaligned.h>
72
73
74 #define DRIVER_DESC             "PLX NET228x USB Peripheral Controller"
75 #define DRIVER_VERSION          "2005 Sept 27"
76
77 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
78 #define EP_DONTUSE              13      /* nonzero */
79
80 #define USE_RDK_LEDS            /* GPIO pins control three LEDs */
81
82
83 static const char driver_name [] = "net2280";
84 static const char driver_desc [] = DRIVER_DESC;
85
86 static const char ep0name [] = "ep0";
87 static const char *const ep_name [] = {
88         ep0name,
89         "ep-a", "ep-b", "ep-c", "ep-d",
90         "ep-e", "ep-f",
91 };
92
93 /* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO)
94  * use_dma_chaining -- dma descriptor queueing gives even more irq reduction
95  *
96  * The net2280 DMA engines are not tightly integrated with their FIFOs;
97  * not all cases are (yet) handled well in this driver or the silicon.
98  * Some gadget drivers work better with the dma support here than others.
99  * These two parameters let you use PIO or more aggressive DMA.
100  */
101 static int use_dma = 1;
102 static int use_dma_chaining = 0;
103
104 /* "modprobe net2280 use_dma=n" etc */
105 module_param (use_dma, bool, S_IRUGO);
106 module_param (use_dma_chaining, bool, S_IRUGO);
107
108
109 /* mode 0 == ep-{a,b,c,d} 1K fifo each
110  * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
111  * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
112  */
113 static ushort fifo_mode = 0;
114
115 /* "modprobe net2280 fifo_mode=1" etc */
116 module_param (fifo_mode, ushort, 0644);
117
118 /* enable_suspend -- When enabled, the driver will respond to
119  * USB suspend requests by powering down the NET2280.  Otherwise,
120  * USB suspend requests will be ignored.  This is acceptible for
121  * self-powered devices
122  */
123 static int enable_suspend = 0;
124
125 /* "modprobe net2280 enable_suspend=1" etc */
126 module_param (enable_suspend, bool, S_IRUGO);
127
128
129 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
130
131 #if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG)
132 static char *type_string (u8 bmAttributes)
133 {
134         switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
135         case USB_ENDPOINT_XFER_BULK:    return "bulk";
136         case USB_ENDPOINT_XFER_ISOC:    return "iso";
137         case USB_ENDPOINT_XFER_INT:     return "intr";
138         };
139         return "control";
140 }
141 #endif
142
143 #include "net2280.h"
144
145 #define valid_bit       __constant_cpu_to_le32 (1 << VALID_BIT)
146 #define dma_done_ie     __constant_cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE)
147
148 /*-------------------------------------------------------------------------*/
149
150 static int
151 net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
152 {
153         struct net2280          *dev;
154         struct net2280_ep       *ep;
155         u32                     max, tmp;
156         unsigned long           flags;
157
158         ep = container_of (_ep, struct net2280_ep, ep);
159         if (!_ep || !desc || ep->desc || _ep->name == ep0name
160                         || desc->bDescriptorType != USB_DT_ENDPOINT)
161                 return -EINVAL;
162         dev = ep->dev;
163         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
164                 return -ESHUTDOWN;
165
166         /* erratum 0119 workaround ties up an endpoint number */
167         if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE)
168                 return -EDOM;
169
170         /* sanity check ep-e/ep-f since their fifos are small */
171         max = le16_to_cpu (desc->wMaxPacketSize) & 0x1fff;
172         if (ep->num > 4 && max > 64)
173                 return -ERANGE;
174
175         spin_lock_irqsave (&dev->lock, flags);
176         _ep->maxpacket = max & 0x7ff;
177         ep->desc = desc;
178
179         /* ep_reset() has already been called */
180         ep->stopped = 0;
181         ep->out_overflow = 0;
182
183         /* set speed-dependent max packet; may kick in high bandwidth */
184         set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max);
185
186         /* FIFO lines can't go to different packets.  PIO is ok, so
187          * use it instead of troublesome (non-bulk) multi-packet DMA.
188          */
189         if (ep->dma && (max % 4) != 0 && use_dma_chaining) {
190                 DEBUG (ep->dev, "%s, no dma for maxpacket %d\n",
191                         ep->ep.name, ep->ep.maxpacket);
192                 ep->dma = NULL;
193         }
194
195         /* set type, direction, address; reset fifo counters */
196         writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
197         tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
198         if (tmp == USB_ENDPOINT_XFER_INT) {
199                 /* erratum 0105 workaround prevents hs NYET */
200                 if (dev->chiprev == 0100
201                                 && dev->gadget.speed == USB_SPEED_HIGH
202                                 && !(desc->bEndpointAddress & USB_DIR_IN))
203                         writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE),
204                                 &ep->regs->ep_rsp);
205         } else if (tmp == USB_ENDPOINT_XFER_BULK) {
206                 /* catch some particularly blatant driver bugs */
207                 if ((dev->gadget.speed == USB_SPEED_HIGH
208                                         && max != 512)
209                                 || (dev->gadget.speed == USB_SPEED_FULL
210                                         && max > 64)) {
211                         spin_unlock_irqrestore (&dev->lock, flags);
212                         return -ERANGE;
213                 }
214         }
215         ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0;
216         tmp <<= ENDPOINT_TYPE;
217         tmp |= desc->bEndpointAddress;
218         tmp |= (4 << ENDPOINT_BYTE_COUNT);      /* default full fifo lines */
219         tmp |= 1 << ENDPOINT_ENABLE;
220         wmb ();
221
222         /* for OUT transfers, block the rx fifo until a read is posted */
223         ep->is_in = (tmp & USB_DIR_IN) != 0;
224         if (!ep->is_in)
225                 writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
226         else if (dev->pdev->device != 0x2280) {
227                 /* Added for 2282, Don't use nak packets on an in endpoint,
228                  * this was ignored on 2280
229                  */
230                 writel ((1 << CLEAR_NAK_OUT_PACKETS)
231                         | (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
232         }
233
234         writel (tmp, &ep->regs->ep_cfg);
235
236         /* enable irqs */
237         if (!ep->dma) {                         /* pio, per-packet */
238                 tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
239                 writel (tmp, &dev->regs->pciirqenb0);
240
241                 tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
242                         | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
243                 if (dev->pdev->device == 0x2280)
244                         tmp |= readl (&ep->regs->ep_irqenb);
245                 writel (tmp, &ep->regs->ep_irqenb);
246         } else {                                /* dma, per-request */
247                 tmp = (1 << (8 + ep->num));     /* completion */
248                 tmp |= readl (&dev->regs->pciirqenb1);
249                 writel (tmp, &dev->regs->pciirqenb1);
250
251                 /* for short OUT transfers, dma completions can't
252                  * advance the queue; do it pio-style, by hand.
253                  * NOTE erratum 0112 workaround #2
254                  */
255                 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
256                         tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
257                         writel (tmp, &ep->regs->ep_irqenb);
258
259                         tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0);
260                         writel (tmp, &dev->regs->pciirqenb0);
261                 }
262         }
263
264         tmp = desc->bEndpointAddress;
265         DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
266                 _ep->name, tmp & 0x0f, DIR_STRING (tmp),
267                 type_string (desc->bmAttributes),
268                 ep->dma ? "dma" : "pio", max);
269
270         /* pci writes may still be posted */
271         spin_unlock_irqrestore (&dev->lock, flags);
272         return 0;
273 }
274
275 static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec)
276 {
277         u32     result;
278
279         do {
280                 result = readl (ptr);
281                 if (result == ~(u32)0)          /* "device unplugged" */
282                         return -ENODEV;
283                 result &= mask;
284                 if (result == done)
285                         return 0;
286                 udelay (1);
287                 usec--;
288         } while (usec > 0);
289         return -ETIMEDOUT;
290 }
291
292 static const struct usb_ep_ops net2280_ep_ops;
293
294 static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep)
295 {
296         u32             tmp;
297
298         ep->desc = NULL;
299         INIT_LIST_HEAD (&ep->queue);
300
301         ep->ep.maxpacket = ~0;
302         ep->ep.ops = &net2280_ep_ops;
303
304         /* disable the dma, irqs, endpoint... */
305         if (ep->dma) {
306                 writel (0, &ep->dma->dmactl);
307                 writel (  (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
308                         | (1 << DMA_TRANSACTION_DONE_INTERRUPT)
309                         | (1 << DMA_ABORT)
310                         , &ep->dma->dmastat);
311
312                 tmp = readl (&regs->pciirqenb0);
313                 tmp &= ~(1 << ep->num);
314                 writel (tmp, &regs->pciirqenb0);
315         } else {
316                 tmp = readl (&regs->pciirqenb1);
317                 tmp &= ~(1 << (8 + ep->num));   /* completion */
318                 writel (tmp, &regs->pciirqenb1);
319         }
320         writel (0, &ep->regs->ep_irqenb);
321
322         /* init to our chosen defaults, notably so that we NAK OUT
323          * packets until the driver queues a read (+note erratum 0112)
324          */
325         if (!ep->is_in || ep->dev->pdev->device == 0x2280) {
326                 tmp = (1 << SET_NAK_OUT_PACKETS_MODE)
327                 | (1 << SET_NAK_OUT_PACKETS)
328                 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
329                 | (1 << CLEAR_INTERRUPT_MODE);
330         } else {
331                 /* added for 2282 */
332                 tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE)
333                 | (1 << CLEAR_NAK_OUT_PACKETS)
334                 | (1 << CLEAR_EP_HIDE_STATUS_PHASE)
335                 | (1 << CLEAR_INTERRUPT_MODE);
336         }
337
338         if (ep->num != 0) {
339                 tmp |= (1 << CLEAR_ENDPOINT_TOGGLE)
340                         | (1 << CLEAR_ENDPOINT_HALT);
341         }
342         writel (tmp, &ep->regs->ep_rsp);
343
344         /* scrub most status bits, and flush any fifo state */
345         if (ep->dev->pdev->device == 0x2280)
346                 tmp = (1 << FIFO_OVERFLOW)
347                         | (1 << FIFO_UNDERFLOW);
348         else
349                 tmp = 0;
350
351         writel (tmp | (1 << TIMEOUT)
352                 | (1 << USB_STALL_SENT)
353                 | (1 << USB_IN_NAK_SENT)
354                 | (1 << USB_IN_ACK_RCVD)
355                 | (1 << USB_OUT_PING_NAK_SENT)
356                 | (1 << USB_OUT_ACK_SENT)
357                 | (1 << FIFO_FLUSH)
358                 | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
359                 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
360                 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
361                 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
362                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
363                 | (1 << DATA_IN_TOKEN_INTERRUPT)
364                 , &ep->regs->ep_stat);
365
366         /* fifo size is handled separately */
367 }
368
369 static void nuke (struct net2280_ep *);
370
371 static int net2280_disable (struct usb_ep *_ep)
372 {
373         struct net2280_ep       *ep;
374         unsigned long           flags;
375
376         ep = container_of (_ep, struct net2280_ep, ep);
377         if (!_ep || !ep->desc || _ep->name == ep0name)
378                 return -EINVAL;
379
380         spin_lock_irqsave (&ep->dev->lock, flags);
381         nuke (ep);
382         ep_reset (ep->dev->regs, ep);
383
384         VDEBUG (ep->dev, "disabled %s %s\n",
385                         ep->dma ? "dma" : "pio", _ep->name);
386
387         /* synch memory views with the device */
388         (void) readl (&ep->regs->ep_cfg);
389
390         if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4)
391                 ep->dma = &ep->dev->dma [ep->num - 1];
392
393         spin_unlock_irqrestore (&ep->dev->lock, flags);
394         return 0;
395 }
396
397 /*-------------------------------------------------------------------------*/
398
399 static struct usb_request *
400 net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
401 {
402         struct net2280_ep       *ep;
403         struct net2280_request  *req;
404
405         if (!_ep)
406                 return NULL;
407         ep = container_of (_ep, struct net2280_ep, ep);
408
409         req = kzalloc(sizeof(*req), gfp_flags);
410         if (!req)
411                 return NULL;
412
413         req->req.dma = DMA_ADDR_INVALID;
414         INIT_LIST_HEAD (&req->queue);
415
416         /* this dma descriptor may be swapped with the previous dummy */
417         if (ep->dma) {
418                 struct net2280_dma      *td;
419
420                 td = pci_pool_alloc (ep->dev->requests, gfp_flags,
421                                 &req->td_dma);
422                 if (!td) {
423                         kfree (req);
424                         return NULL;
425                 }
426                 td->dmacount = 0;       /* not VALID */
427                 td->dmaaddr = __constant_cpu_to_le32 (DMA_ADDR_INVALID);
428                 td->dmadesc = td->dmaaddr;
429                 req->td = td;
430         }
431         return &req->req;
432 }
433
434 static void
435 net2280_free_request (struct usb_ep *_ep, struct usb_request *_req)
436 {
437         struct net2280_ep       *ep;
438         struct net2280_request  *req;
439
440         ep = container_of (_ep, struct net2280_ep, ep);
441         if (!_ep || !_req)
442                 return;
443
444         req = container_of (_req, struct net2280_request, req);
445         WARN_ON (!list_empty (&req->queue));
446         if (req->td)
447                 pci_pool_free (ep->dev->requests, req->td, req->td_dma);
448         kfree (req);
449 }
450
451 /*-------------------------------------------------------------------------*/
452
453 /*
454  * dma-coherent memory allocation (for dma-capable endpoints)
455  *
456  * NOTE: the dma_*_coherent() API calls suck.  Most implementations are
457  * (a) page-oriented, so small buffers lose big; and (b) asymmetric with
458  * respect to calls with irqs disabled:  alloc is safe, free is not.
459  * We currently work around (b), but not (a).
460  */
461
462 static void *
463 net2280_alloc_buffer (
464         struct usb_ep           *_ep,
465         unsigned                bytes,
466         dma_addr_t              *dma,
467         gfp_t                   gfp_flags
468 )
469 {
470         void                    *retval;
471         struct net2280_ep       *ep;
472
473         ep = container_of (_ep, struct net2280_ep, ep);
474         if (!_ep)
475                 return NULL;
476         *dma = DMA_ADDR_INVALID;
477
478         if (ep->dma)
479                 retval = dma_alloc_coherent(&ep->dev->pdev->dev,
480                                 bytes, dma, gfp_flags);
481         else
482                 retval = kmalloc(bytes, gfp_flags);
483         return retval;
484 }
485
486 static DEFINE_SPINLOCK(buflock);
487 static LIST_HEAD(buffers);
488
489 struct free_record {
490         struct list_head        list;
491         struct device           *dev;
492         unsigned                bytes;
493         dma_addr_t              dma;
494 };
495
496 static void do_free(unsigned long ignored)
497 {
498         spin_lock_irq(&buflock);
499         while (!list_empty(&buffers)) {
500                 struct free_record      *buf;
501
502                 buf = list_entry(buffers.next, struct free_record, list);
503                 list_del(&buf->list);
504                 spin_unlock_irq(&buflock);
505
506                 dma_free_coherent(buf->dev, buf->bytes, buf, buf->dma);
507
508                 spin_lock_irq(&buflock);
509         }
510         spin_unlock_irq(&buflock);
511 }
512
513 static DECLARE_TASKLET(deferred_free, do_free, 0);
514
515 static void
516 net2280_free_buffer (
517         struct usb_ep *_ep,
518         void *address,
519         dma_addr_t dma,
520         unsigned bytes
521 ) {
522         /* free memory into the right allocator */
523         if (dma != DMA_ADDR_INVALID) {
524                 struct net2280_ep       *ep;
525                 struct free_record      *buf = address;
526                 unsigned long           flags;
527
528                 ep = container_of(_ep, struct net2280_ep, ep);
529                 if (!_ep)
530                         return;
531
532                 ep = container_of (_ep, struct net2280_ep, ep);
533                 buf->dev = &ep->dev->pdev->dev;
534                 buf->bytes = bytes;
535                 buf->dma = dma;
536
537                 spin_lock_irqsave(&buflock, flags);
538                 list_add_tail(&buf->list, &buffers);
539                 tasklet_schedule(&deferred_free);
540                 spin_unlock_irqrestore(&buflock, flags);
541         } else
542                 kfree (address);
543 }
544
545 /*-------------------------------------------------------------------------*/
546
547 /* load a packet into the fifo we use for usb IN transfers.
548  * works for all endpoints.
549  *
550  * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
551  * at a time, but this code is simpler because it knows it only writes
552  * one packet.  ep-a..ep-d should use dma instead.
553  */
554 static void
555 write_fifo (struct net2280_ep *ep, struct usb_request *req)
556 {
557         struct net2280_ep_regs  __iomem *regs = ep->regs;
558         u8                      *buf;
559         u32                     tmp;
560         unsigned                count, total;
561
562         /* INVARIANT:  fifo is currently empty. (testable) */
563
564         if (req) {
565                 buf = req->buf + req->actual;
566                 prefetch (buf);
567                 total = req->length - req->actual;
568         } else {
569                 total = 0;
570                 buf = NULL;
571         }
572
573         /* write just one packet at a time */
574         count = ep->ep.maxpacket;
575         if (count > total)      /* min() cannot be used on a bitfield */
576                 count = total;
577
578         VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
579                         ep->ep.name, count,
580                         (count != ep->ep.maxpacket) ? " (short)" : "",
581                         req);
582         while (count >= 4) {
583                 /* NOTE be careful if you try to align these. fifo lines
584                  * should normally be full (4 bytes) and successive partial
585                  * lines are ok only in certain cases.
586                  */
587                 tmp = get_unaligned ((u32 *)buf);
588                 cpu_to_le32s (&tmp);
589                 writel (tmp, &regs->ep_data);
590                 buf += 4;
591                 count -= 4;
592         }
593
594         /* last fifo entry is "short" unless we wrote a full packet.
595          * also explicitly validate last word in (periodic) transfers
596          * when maxpacket is not a multiple of 4 bytes.
597          */
598         if (count || total < ep->ep.maxpacket) {
599                 tmp = count ? get_unaligned ((u32 *)buf) : count;
600                 cpu_to_le32s (&tmp);
601                 set_fifo_bytecount (ep, count & 0x03);
602                 writel (tmp, &regs->ep_data);
603         }
604
605         /* pci writes may still be posted */
606 }
607
608 /* work around erratum 0106: PCI and USB race over the OUT fifo.
609  * caller guarantees chiprev 0100, out endpoint is NAKing, and
610  * there's no real data in the fifo.
611  *
612  * NOTE:  also used in cases where that erratum doesn't apply:
613  * where the host wrote "too much" data to us.
614  */
615 static void out_flush (struct net2280_ep *ep)
616 {
617         u32     __iomem *statp;
618         u32     tmp;
619
620         ASSERT_OUT_NAKING (ep);
621
622         statp = &ep->regs->ep_stat;
623         writel (  (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
624                 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
625                 , statp);
626         writel ((1 << FIFO_FLUSH), statp);
627         mb ();
628         tmp = readl (statp);
629         if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
630                         /* high speed did bulk NYET; fifo isn't filling */
631                         && ep->dev->gadget.speed == USB_SPEED_FULL) {
632                 unsigned        usec;
633
634                 usec = 50;              /* 64 byte bulk/interrupt */
635                 handshake (statp, (1 << USB_OUT_PING_NAK_SENT),
636                                 (1 << USB_OUT_PING_NAK_SENT), usec);
637                 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
638         }
639 }
640
641 /* unload packet(s) from the fifo we use for usb OUT transfers.
642  * returns true iff the request completed, because of short packet
643  * or the request buffer having filled with full packets.
644  *
645  * for ep-a..ep-d this will read multiple packets out when they
646  * have been accepted.
647  */
648 static int
649 read_fifo (struct net2280_ep *ep, struct net2280_request *req)
650 {
651         struct net2280_ep_regs  __iomem *regs = ep->regs;
652         u8                      *buf = req->req.buf + req->req.actual;
653         unsigned                count, tmp, is_short;
654         unsigned                cleanup = 0, prevent = 0;
655
656         /* erratum 0106 ... packets coming in during fifo reads might
657          * be incompletely rejected.  not all cases have workarounds.
658          */
659         if (ep->dev->chiprev == 0x0100
660                         && ep->dev->gadget.speed == USB_SPEED_FULL) {
661                 udelay (1);
662                 tmp = readl (&ep->regs->ep_stat);
663                 if ((tmp & (1 << NAK_OUT_PACKETS)))
664                         cleanup = 1;
665                 else if ((tmp & (1 << FIFO_FULL))) {
666                         start_out_naking (ep);
667                         prevent = 1;
668                 }
669                 /* else: hope we don't see the problem */
670         }
671
672         /* never overflow the rx buffer. the fifo reads packets until
673          * it sees a short one; we might not be ready for them all.
674          */
675         prefetchw (buf);
676         count = readl (&regs->ep_avail);
677         if (unlikely (count == 0)) {
678                 udelay (1);
679                 tmp = readl (&ep->regs->ep_stat);
680                 count = readl (&regs->ep_avail);
681                 /* handled that data already? */
682                 if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0)
683                         return 0;
684         }
685
686         tmp = req->req.length - req->req.actual;
687         if (count > tmp) {
688                 /* as with DMA, data overflow gets flushed */
689                 if ((tmp % ep->ep.maxpacket) != 0) {
690                         ERROR (ep->dev,
691                                 "%s out fifo %d bytes, expected %d\n",
692                                 ep->ep.name, count, tmp);
693                         req->req.status = -EOVERFLOW;
694                         cleanup = 1;
695                         /* NAK_OUT_PACKETS will be set, so flushing is safe;
696                          * the next read will start with the next packet
697                          */
698                 } /* else it's a ZLP, no worries */
699                 count = tmp;
700         }
701         req->req.actual += count;
702
703         is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
704
705         VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
706                         ep->ep.name, count, is_short ? " (short)" : "",
707                         cleanup ? " flush" : "", prevent ? " nak" : "",
708                         req, req->req.actual, req->req.length);
709
710         while (count >= 4) {
711                 tmp = readl (&regs->ep_data);
712                 cpu_to_le32s (&tmp);
713                 put_unaligned (tmp, (u32 *)buf);
714                 buf += 4;
715                 count -= 4;
716         }
717         if (count) {
718                 tmp = readl (&regs->ep_data);
719                 /* LE conversion is implicit here: */
720                 do {
721                         *buf++ = (u8) tmp;
722                         tmp >>= 8;
723                 } while (--count);
724         }
725         if (cleanup)
726                 out_flush (ep);
727         if (prevent) {
728                 writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
729                 (void) readl (&ep->regs->ep_rsp);
730         }
731
732         return is_short || ((req->req.actual == req->req.length)
733                                 && !req->req.zero);
734 }
735
736 /* fill out dma descriptor to match a given request */
737 static void
738 fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid)
739 {
740         struct net2280_dma      *td = req->td;
741         u32                     dmacount = req->req.length;
742
743         /* don't let DMA continue after a short OUT packet,
744          * so overruns can't affect the next transfer.
745          * in case of overruns on max-size packets, we can't
746          * stop the fifo from filling but we can flush it.
747          */
748         if (ep->is_in)
749                 dmacount |= (1 << DMA_DIRECTION);
750         if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0)
751                         || ep->dev->pdev->device != 0x2280)
752                 dmacount |= (1 << END_OF_CHAIN);
753
754         req->valid = valid;
755         if (valid)
756                 dmacount |= (1 << VALID_BIT);
757         if (likely(!req->req.no_interrupt || !use_dma_chaining))
758                 dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE);
759
760         /* td->dmadesc = previously set by caller */
761         td->dmaaddr = cpu_to_le32 (req->req.dma);
762
763         /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
764         wmb ();
765         td->dmacount = cpu_to_le32p (&dmacount);
766 }
767
768 static const u32 dmactl_default =
769                   (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT)
770                 | (1 << DMA_CLEAR_COUNT_ENABLE)
771                 /* erratum 0116 workaround part 1 (use POLLING) */
772                 | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE)
773                 | (1 << DMA_VALID_BIT_POLLING_ENABLE)
774                 | (1 << DMA_VALID_BIT_ENABLE)
775                 | (1 << DMA_SCATTER_GATHER_ENABLE)
776                 /* erratum 0116 workaround part 2 (no AUTOSTART) */
777                 | (1 << DMA_ENABLE);
778
779 static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma)
780 {
781         handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50);
782 }
783
784 static inline void stop_dma (struct net2280_dma_regs __iomem *dma)
785 {
786         writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl);
787         spin_stop_dma (dma);
788 }
789
790 static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma)
791 {
792         struct net2280_dma_regs __iomem *dma = ep->dma;
793         unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION);
794
795         if (ep->dev->pdev->device != 0x2280)
796                 tmp |= (1 << END_OF_CHAIN);
797
798         writel (tmp, &dma->dmacount);
799         writel (readl (&dma->dmastat), &dma->dmastat);
800
801         writel (td_dma, &dma->dmadesc);
802         writel (dmactl, &dma->dmactl);
803
804         /* erratum 0116 workaround part 3:  pci arbiter away from net2280 */
805         (void) readl (&ep->dev->pci->pcimstctl);
806
807         writel ((1 << DMA_START), &dma->dmastat);
808
809         if (!ep->is_in)
810                 stop_out_naking (ep);
811 }
812
813 static void start_dma (struct net2280_ep *ep, struct net2280_request *req)
814 {
815         u32                     tmp;
816         struct net2280_dma_regs __iomem *dma = ep->dma;
817
818         /* FIXME can't use DMA for ZLPs */
819
820         /* on this path we "know" there's no dma active (yet) */
821         WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE));
822         writel (0, &ep->dma->dmactl);
823
824         /* previous OUT packet might have been short */
825         if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat))
826                                 & (1 << NAK_OUT_PACKETS)) != 0) {
827                 writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT),
828                         &ep->regs->ep_stat);
829
830                 tmp = readl (&ep->regs->ep_avail);
831                 if (tmp) {
832                         writel (readl (&dma->dmastat), &dma->dmastat);
833
834                         /* transfer all/some fifo data */
835                         writel (req->req.dma, &dma->dmaaddr);
836                         tmp = min (tmp, req->req.length);
837
838                         /* dma irq, faking scatterlist status */
839                         req->td->dmacount = cpu_to_le32 (req->req.length - tmp);
840                         writel ((1 << DMA_DONE_INTERRUPT_ENABLE)
841                                 | tmp, &dma->dmacount);
842                         req->td->dmadesc = 0;
843                         req->valid = 1;
844
845                         writel ((1 << DMA_ENABLE), &dma->dmactl);
846                         writel ((1 << DMA_START), &dma->dmastat);
847                         return;
848                 }
849         }
850
851         tmp = dmactl_default;
852
853         /* force packet boundaries between dma requests, but prevent the
854          * controller from automagically writing a last "short" packet
855          * (zero length) unless the driver explicitly said to do that.
856          */
857         if (ep->is_in) {
858                 if (likely ((req->req.length % ep->ep.maxpacket) != 0
859                                 || req->req.zero)) {
860                         tmp |= (1 << DMA_FIFO_VALIDATE);
861                         ep->in_fifo_validate = 1;
862                 } else
863                         ep->in_fifo_validate = 0;
864         }
865
866         /* init req->td, pointing to the current dummy */
867         req->td->dmadesc = cpu_to_le32 (ep->td_dma);
868         fill_dma_desc (ep, req, 1);
869
870         if (!use_dma_chaining)
871                 req->td->dmacount |= __constant_cpu_to_le32 (1 << END_OF_CHAIN);
872
873         start_queue (ep, tmp, req->td_dma);
874 }
875
876 static inline void
877 queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid)
878 {
879         struct net2280_dma      *end;
880         dma_addr_t              tmp;
881
882         /* swap new dummy for old, link; fill and maybe activate */
883         end = ep->dummy;
884         ep->dummy = req->td;
885         req->td = end;
886
887         tmp = ep->td_dma;
888         ep->td_dma = req->td_dma;
889         req->td_dma = tmp;
890
891         end->dmadesc = cpu_to_le32 (ep->td_dma);
892
893         fill_dma_desc (ep, req, valid);
894 }
895
896 static void
897 done (struct net2280_ep *ep, struct net2280_request *req, int status)
898 {
899         struct net2280          *dev;
900         unsigned                stopped = ep->stopped;
901
902         list_del_init (&req->queue);
903
904         if (req->req.status == -EINPROGRESS)
905                 req->req.status = status;
906         else
907                 status = req->req.status;
908
909         dev = ep->dev;
910         if (req->mapped) {
911                 pci_unmap_single (dev->pdev, req->req.dma, req->req.length,
912                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
913                 req->req.dma = DMA_ADDR_INVALID;
914                 req->mapped = 0;
915         }
916
917         if (status && status != -ESHUTDOWN)
918                 VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n",
919                         ep->ep.name, &req->req, status,
920                         req->req.actual, req->req.length);
921
922         /* don't modify queue heads during completion callback */
923         ep->stopped = 1;
924         spin_unlock (&dev->lock);
925         req->req.complete (&ep->ep, &req->req);
926         spin_lock (&dev->lock);
927         ep->stopped = stopped;
928 }
929
930 /*-------------------------------------------------------------------------*/
931
932 static int
933 net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
934 {
935         struct net2280_request  *req;
936         struct net2280_ep       *ep;
937         struct net2280          *dev;
938         unsigned long           flags;
939
940         /* we always require a cpu-view buffer, so that we can
941          * always use pio (as fallback or whatever).
942          */
943         req = container_of (_req, struct net2280_request, req);
944         if (!_req || !_req->complete || !_req->buf
945                         || !list_empty (&req->queue))
946                 return -EINVAL;
947         if (_req->length > (~0 & DMA_BYTE_COUNT_MASK))
948                 return -EDOM;
949         ep = container_of (_ep, struct net2280_ep, ep);
950         if (!_ep || (!ep->desc && ep->num != 0))
951                 return -EINVAL;
952         dev = ep->dev;
953         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
954                 return -ESHUTDOWN;
955
956         /* FIXME implement PIO fallback for ZLPs with DMA */
957         if (ep->dma && _req->length == 0)
958                 return -EOPNOTSUPP;
959
960         /* set up dma mapping in case the caller didn't */
961         if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
962                 _req->dma = pci_map_single (dev->pdev, _req->buf, _req->length,
963                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
964                 req->mapped = 1;
965         }
966
967 #if 0
968         VDEBUG (dev, "%s queue req %p, len %d buf %p\n",
969                         _ep->name, _req, _req->length, _req->buf);
970 #endif
971
972         spin_lock_irqsave (&dev->lock, flags);
973
974         _req->status = -EINPROGRESS;
975         _req->actual = 0;
976
977         /* kickstart this i/o queue? */
978         if (list_empty (&ep->queue) && !ep->stopped) {
979                 /* use DMA if the endpoint supports it, else pio */
980                 if (ep->dma)
981                         start_dma (ep, req);
982                 else {
983                         /* maybe there's no control data, just status ack */
984                         if (ep->num == 0 && _req->length == 0) {
985                                 allow_status (ep);
986                                 done (ep, req, 0);
987                                 VDEBUG (dev, "%s status ack\n", ep->ep.name);
988                                 goto done;
989                         }
990
991                         /* PIO ... stuff the fifo, or unblock it.  */
992                         if (ep->is_in)
993                                 write_fifo (ep, _req);
994                         else if (list_empty (&ep->queue)) {
995                                 u32     s;
996
997                                 /* OUT FIFO might have packet(s) buffered */
998                                 s = readl (&ep->regs->ep_stat);
999                                 if ((s & (1 << FIFO_EMPTY)) == 0) {
1000                                         /* note:  _req->short_not_ok is
1001                                          * ignored here since PIO _always_
1002                                          * stops queue advance here, and
1003                                          * _req->status doesn't change for
1004                                          * short reads (only _req->actual)
1005                                          */
1006                                         if (read_fifo (ep, req)) {
1007                                                 done (ep, req, 0);
1008                                                 if (ep->num == 0)
1009                                                         allow_status (ep);
1010                                                 /* don't queue it */
1011                                                 req = NULL;
1012                                         } else
1013                                                 s = readl (&ep->regs->ep_stat);
1014                                 }
1015
1016                                 /* don't NAK, let the fifo fill */
1017                                 if (req && (s & (1 << NAK_OUT_PACKETS)))
1018                                         writel ((1 << CLEAR_NAK_OUT_PACKETS),
1019                                                         &ep->regs->ep_rsp);
1020                         }
1021                 }
1022
1023         } else if (ep->dma) {
1024                 int     valid = 1;
1025
1026                 if (ep->is_in) {
1027                         int     expect;
1028
1029                         /* preventing magic zlps is per-engine state, not
1030                          * per-transfer; irq logic must recover hiccups.
1031                          */
1032                         expect = likely (req->req.zero
1033                                 || (req->req.length % ep->ep.maxpacket) != 0);
1034                         if (expect != ep->in_fifo_validate)
1035                                 valid = 0;
1036                 }
1037                 queue_dma (ep, req, valid);
1038
1039         } /* else the irq handler advances the queue. */
1040
1041         ep->responded = 1;
1042         if (req)
1043                 list_add_tail (&req->queue, &ep->queue);
1044 done:
1045         spin_unlock_irqrestore (&dev->lock, flags);
1046
1047         /* pci writes may still be posted */
1048         return 0;
1049 }
1050
1051 static inline void
1052 dma_done (
1053         struct net2280_ep *ep,
1054         struct net2280_request *req,
1055         u32 dmacount,
1056         int status
1057 )
1058 {
1059         req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1060         done (ep, req, status);
1061 }
1062
1063 static void restart_dma (struct net2280_ep *ep);
1064
1065 static void scan_dma_completions (struct net2280_ep *ep)
1066 {
1067         /* only look at descriptors that were "naturally" retired,
1068          * so fifo and list head state won't matter
1069          */
1070         while (!list_empty (&ep->queue)) {
1071                 struct net2280_request  *req;
1072                 u32                     tmp;
1073
1074                 req = list_entry (ep->queue.next,
1075                                 struct net2280_request, queue);
1076                 if (!req->valid)
1077                         break;
1078                 rmb ();
1079                 tmp = le32_to_cpup (&req->td->dmacount);
1080                 if ((tmp & (1 << VALID_BIT)) != 0)
1081                         break;
1082
1083                 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1084                  * cases where DMA must be aborted; this code handles
1085                  * all non-abort DMA completions.
1086                  */
1087                 if (unlikely (req->td->dmadesc == 0)) {
1088                         /* paranoia */
1089                         tmp = readl (&ep->dma->dmacount);
1090                         if (tmp & DMA_BYTE_COUNT_MASK)
1091                                 break;
1092                         /* single transfer mode */
1093                         dma_done (ep, req, tmp, 0);
1094                         break;
1095                 } else if (!ep->is_in
1096                                 && (req->req.length % ep->ep.maxpacket) != 0) {
1097                         tmp = readl (&ep->regs->ep_stat);
1098
1099                         /* AVOID TROUBLE HERE by not issuing short reads from
1100                          * your gadget driver.  That helps avoids errata 0121,
1101                          * 0122, and 0124; not all cases trigger the warning.
1102                          */
1103                         if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
1104                                 WARN (ep->dev, "%s lost packet sync!\n",
1105                                                 ep->ep.name);
1106                                 req->req.status = -EOVERFLOW;
1107                         } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) {
1108                                 /* fifo gets flushed later */
1109                                 ep->out_overflow = 1;
1110                                 DEBUG (ep->dev, "%s dma, discard %d len %d\n",
1111                                                 ep->ep.name, tmp,
1112                                                 req->req.length);
1113                                 req->req.status = -EOVERFLOW;
1114                         }
1115                 }
1116                 dma_done (ep, req, tmp, 0);
1117         }
1118 }
1119
1120 static void restart_dma (struct net2280_ep *ep)
1121 {
1122         struct net2280_request  *req;
1123         u32                     dmactl = dmactl_default;
1124
1125         if (ep->stopped)
1126                 return;
1127         req = list_entry (ep->queue.next, struct net2280_request, queue);
1128
1129         if (!use_dma_chaining) {
1130                 start_dma (ep, req);
1131                 return;
1132         }
1133
1134         /* the 2280 will be processing the queue unless queue hiccups after
1135          * the previous transfer:
1136          *  IN:   wanted automagic zlp, head doesn't (or vice versa)
1137          *        DMA_FIFO_VALIDATE doesn't init from dma descriptors.
1138          *  OUT:  was "usb-short", we must restart.
1139          */
1140         if (ep->is_in && !req->valid) {
1141                 struct net2280_request  *entry, *prev = NULL;
1142                 int                     reqmode, done = 0;
1143
1144                 DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td);
1145                 ep->in_fifo_validate = likely (req->req.zero
1146                         || (req->req.length % ep->ep.maxpacket) != 0);
1147                 if (ep->in_fifo_validate)
1148                         dmactl |= (1 << DMA_FIFO_VALIDATE);
1149                 list_for_each_entry (entry, &ep->queue, queue) {
1150                         __le32          dmacount;
1151
1152                         if (entry == req)
1153                                 continue;
1154                         dmacount = entry->td->dmacount;
1155                         if (!done) {
1156                                 reqmode = likely (entry->req.zero
1157                                         || (entry->req.length
1158                                                 % ep->ep.maxpacket) != 0);
1159                                 if (reqmode == ep->in_fifo_validate) {
1160                                         entry->valid = 1;
1161                                         dmacount |= valid_bit;
1162                                         entry->td->dmacount = dmacount;
1163                                         prev = entry;
1164                                         continue;
1165                                 } else {
1166                                         /* force a hiccup */
1167                                         prev->td->dmacount |= dma_done_ie;
1168                                         done = 1;
1169                                 }
1170                         }
1171
1172                         /* walk the rest of the queue so unlinks behave */
1173                         entry->valid = 0;
1174                         dmacount &= ~valid_bit;
1175                         entry->td->dmacount = dmacount;
1176                         prev = entry;
1177                 }
1178         }
1179
1180         writel (0, &ep->dma->dmactl);
1181         start_queue (ep, dmactl, req->td_dma);
1182 }
1183
1184 static void abort_dma (struct net2280_ep *ep)
1185 {
1186         /* abort the current transfer */
1187         if (likely (!list_empty (&ep->queue))) {
1188                 /* FIXME work around errata 0121, 0122, 0124 */
1189                 writel ((1 << DMA_ABORT), &ep->dma->dmastat);
1190                 spin_stop_dma (ep->dma);
1191         } else
1192                 stop_dma (ep->dma);
1193         scan_dma_completions (ep);
1194 }
1195
1196 /* dequeue ALL requests */
1197 static void nuke (struct net2280_ep *ep)
1198 {
1199         struct net2280_request  *req;
1200
1201         /* called with spinlock held */
1202         ep->stopped = 1;
1203         if (ep->dma)
1204                 abort_dma (ep);
1205         while (!list_empty (&ep->queue)) {
1206                 req = list_entry (ep->queue.next,
1207                                 struct net2280_request,
1208                                 queue);
1209                 done (ep, req, -ESHUTDOWN);
1210         }
1211 }
1212
1213 /* dequeue JUST ONE request */
1214 static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req)
1215 {
1216         struct net2280_ep       *ep;
1217         struct net2280_request  *req;
1218         unsigned long           flags;
1219         u32                     dmactl;
1220         int                     stopped;
1221
1222         ep = container_of (_ep, struct net2280_ep, ep);
1223         if (!_ep || (!ep->desc && ep->num != 0) || !_req)
1224                 return -EINVAL;
1225
1226         spin_lock_irqsave (&ep->dev->lock, flags);
1227         stopped = ep->stopped;
1228
1229         /* quiesce dma while we patch the queue */
1230         dmactl = 0;
1231         ep->stopped = 1;
1232         if (ep->dma) {
1233                 dmactl = readl (&ep->dma->dmactl);
1234                 /* WARNING erratum 0127 may kick in ... */
1235                 stop_dma (ep->dma);
1236                 scan_dma_completions (ep);
1237         }
1238
1239         /* make sure it's still queued on this endpoint */
1240         list_for_each_entry (req, &ep->queue, queue) {
1241                 if (&req->req == _req)
1242                         break;
1243         }
1244         if (&req->req != _req) {
1245                 spin_unlock_irqrestore (&ep->dev->lock, flags);
1246                 return -EINVAL;
1247         }
1248
1249         /* queue head may be partially complete. */
1250         if (ep->queue.next == &req->queue) {
1251                 if (ep->dma) {
1252                         DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name);
1253                         _req->status = -ECONNRESET;
1254                         abort_dma (ep);
1255                         if (likely (ep->queue.next == &req->queue)) {
1256                                 // NOTE: misreports single-transfer mode
1257                                 req->td->dmacount = 0;  /* invalidate */
1258                                 dma_done (ep, req,
1259                                         readl (&ep->dma->dmacount),
1260                                         -ECONNRESET);
1261                         }
1262                 } else {
1263                         DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name);
1264                         done (ep, req, -ECONNRESET);
1265                 }
1266                 req = NULL;
1267
1268         /* patch up hardware chaining data */
1269         } else if (ep->dma && use_dma_chaining) {
1270                 if (req->queue.prev == ep->queue.next) {
1271                         writel (le32_to_cpu (req->td->dmadesc),
1272                                 &ep->dma->dmadesc);
1273                         if (req->td->dmacount & dma_done_ie)
1274                                 writel (readl (&ep->dma->dmacount)
1275                                                 | le32_to_cpu(dma_done_ie),
1276                                         &ep->dma->dmacount);
1277                 } else {
1278                         struct net2280_request  *prev;
1279
1280                         prev = list_entry (req->queue.prev,
1281                                 struct net2280_request, queue);
1282                         prev->td->dmadesc = req->td->dmadesc;
1283                         if (req->td->dmacount & dma_done_ie)
1284                                 prev->td->dmacount |= dma_done_ie;
1285                 }
1286         }
1287
1288         if (req)
1289                 done (ep, req, -ECONNRESET);
1290         ep->stopped = stopped;
1291
1292         if (ep->dma) {
1293                 /* turn off dma on inactive queues */
1294                 if (list_empty (&ep->queue))
1295                         stop_dma (ep->dma);
1296                 else if (!ep->stopped) {
1297                         /* resume current request, or start new one */
1298                         if (req)
1299                                 writel (dmactl, &ep->dma->dmactl);
1300                         else
1301                                 start_dma (ep, list_entry (ep->queue.next,
1302                                         struct net2280_request, queue));
1303                 }
1304         }
1305
1306         spin_unlock_irqrestore (&ep->dev->lock, flags);
1307         return 0;
1308 }
1309
1310 /*-------------------------------------------------------------------------*/
1311
1312 static int net2280_fifo_status (struct usb_ep *_ep);
1313
1314 static int
1315 net2280_set_halt (struct usb_ep *_ep, int value)
1316 {
1317         struct net2280_ep       *ep;
1318         unsigned long           flags;
1319         int                     retval = 0;
1320
1321         ep = container_of (_ep, struct net2280_ep, ep);
1322         if (!_ep || (!ep->desc && ep->num != 0))
1323                 return -EINVAL;
1324         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1325                 return -ESHUTDOWN;
1326         if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1327                                                 == USB_ENDPOINT_XFER_ISOC)
1328                 return -EINVAL;
1329
1330         spin_lock_irqsave (&ep->dev->lock, flags);
1331         if (!list_empty (&ep->queue))
1332                 retval = -EAGAIN;
1333         else if (ep->is_in && value && net2280_fifo_status (_ep) != 0)
1334                 retval = -EAGAIN;
1335         else {
1336                 VDEBUG (ep->dev, "%s %s halt\n", _ep->name,
1337                                 value ? "set" : "clear");
1338                 /* set/clear, then synch memory views with the device */
1339                 if (value) {
1340                         if (ep->num == 0)
1341                                 ep->dev->protocol_stall = 1;
1342                         else
1343                                 set_halt (ep);
1344                 } else
1345                         clear_halt (ep);
1346                 (void) readl (&ep->regs->ep_rsp);
1347         }
1348         spin_unlock_irqrestore (&ep->dev->lock, flags);
1349
1350         return retval;
1351 }
1352
1353 static int
1354 net2280_fifo_status (struct usb_ep *_ep)
1355 {
1356         struct net2280_ep       *ep;
1357         u32                     avail;
1358
1359         ep = container_of (_ep, struct net2280_ep, ep);
1360         if (!_ep || (!ep->desc && ep->num != 0))
1361                 return -ENODEV;
1362         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1363                 return -ESHUTDOWN;
1364
1365         avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1);
1366         if (avail > ep->fifo_size)
1367                 return -EOVERFLOW;
1368         if (ep->is_in)
1369                 avail = ep->fifo_size - avail;
1370         return avail;
1371 }
1372
1373 static void
1374 net2280_fifo_flush (struct usb_ep *_ep)
1375 {
1376         struct net2280_ep       *ep;
1377
1378         ep = container_of (_ep, struct net2280_ep, ep);
1379         if (!_ep || (!ep->desc && ep->num != 0))
1380                 return;
1381         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1382                 return;
1383
1384         writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat);
1385         (void) readl (&ep->regs->ep_rsp);
1386 }
1387
1388 static const struct usb_ep_ops net2280_ep_ops = {
1389         .enable         = net2280_enable,
1390         .disable        = net2280_disable,
1391
1392         .alloc_request  = net2280_alloc_request,
1393         .free_request   = net2280_free_request,
1394
1395         .alloc_buffer   = net2280_alloc_buffer,
1396         .free_buffer    = net2280_free_buffer,
1397
1398         .queue          = net2280_queue,
1399         .dequeue        = net2280_dequeue,
1400
1401         .set_halt       = net2280_set_halt,
1402         .fifo_status    = net2280_fifo_status,
1403         .fifo_flush     = net2280_fifo_flush,
1404 };
1405
1406 /*-------------------------------------------------------------------------*/
1407
1408 static int net2280_get_frame (struct usb_gadget *_gadget)
1409 {
1410         struct net2280          *dev;
1411         unsigned long           flags;
1412         u16                     retval;
1413
1414         if (!_gadget)
1415                 return -ENODEV;
1416         dev = container_of (_gadget, struct net2280, gadget);
1417         spin_lock_irqsave (&dev->lock, flags);
1418         retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff;
1419         spin_unlock_irqrestore (&dev->lock, flags);
1420         return retval;
1421 }
1422
1423 static int net2280_wakeup (struct usb_gadget *_gadget)
1424 {
1425         struct net2280          *dev;
1426         u32                     tmp;
1427         unsigned long           flags;
1428
1429         if (!_gadget)
1430                 return 0;
1431         dev = container_of (_gadget, struct net2280, gadget);
1432
1433         spin_lock_irqsave (&dev->lock, flags);
1434         tmp = readl (&dev->usb->usbctl);
1435         if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE))
1436                 writel (1 << GENERATE_RESUME, &dev->usb->usbstat);
1437         spin_unlock_irqrestore (&dev->lock, flags);
1438
1439         /* pci writes may still be posted */
1440         return 0;
1441 }
1442
1443 static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value)
1444 {
1445         struct net2280          *dev;
1446         u32                     tmp;
1447         unsigned long           flags;
1448
1449         if (!_gadget)
1450                 return 0;
1451         dev = container_of (_gadget, struct net2280, gadget);
1452
1453         spin_lock_irqsave (&dev->lock, flags);
1454         tmp = readl (&dev->usb->usbctl);
1455         if (value)
1456                 tmp |= (1 << SELF_POWERED_STATUS);
1457         else
1458                 tmp &= ~(1 << SELF_POWERED_STATUS);
1459         writel (tmp, &dev->usb->usbctl);
1460         spin_unlock_irqrestore (&dev->lock, flags);
1461
1462         return 0;
1463 }
1464
1465 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1466 {
1467         struct net2280  *dev;
1468         u32             tmp;
1469         unsigned long   flags;
1470
1471         if (!_gadget)
1472                 return -ENODEV;
1473         dev = container_of (_gadget, struct net2280, gadget);
1474
1475         spin_lock_irqsave (&dev->lock, flags);
1476         tmp = readl (&dev->usb->usbctl);
1477         dev->softconnect = (is_on != 0);
1478         if (is_on)
1479                 tmp |= (1 << USB_DETECT_ENABLE);
1480         else
1481                 tmp &= ~(1 << USB_DETECT_ENABLE);
1482         writel (tmp, &dev->usb->usbctl);
1483         spin_unlock_irqrestore (&dev->lock, flags);
1484
1485         return 0;
1486 }
1487
1488 static const struct usb_gadget_ops net2280_ops = {
1489         .get_frame      = net2280_get_frame,
1490         .wakeup         = net2280_wakeup,
1491         .set_selfpowered = net2280_set_selfpowered,
1492         .pullup         = net2280_pullup,
1493 };
1494
1495 /*-------------------------------------------------------------------------*/
1496
1497 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1498
1499 /* FIXME move these into procfs, and use seq_file.
1500  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1501  * and also doesn't help products using this with 2.4 kernels.
1502  */
1503
1504 /* "function" sysfs attribute */
1505 static ssize_t
1506 show_function (struct device *_dev, struct device_attribute *attr, char *buf)
1507 {
1508         struct net2280  *dev = dev_get_drvdata (_dev);
1509
1510         if (!dev->driver
1511                         || !dev->driver->function
1512                         || strlen (dev->driver->function) > PAGE_SIZE)
1513                 return 0;
1514         return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function);
1515 }
1516 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
1517
1518 static ssize_t
1519 show_registers (struct device *_dev, struct device_attribute *attr, char *buf)
1520 {
1521         struct net2280          *dev;
1522         char                    *next;
1523         unsigned                size, t;
1524         unsigned long           flags;
1525         int                     i;
1526         u32                     t1, t2;
1527         const char              *s;
1528
1529         dev = dev_get_drvdata (_dev);
1530         next = buf;
1531         size = PAGE_SIZE;
1532         spin_lock_irqsave (&dev->lock, flags);
1533
1534         if (dev->driver)
1535                 s = dev->driver->driver.name;
1536         else
1537                 s = "(none)";
1538
1539         /* Main Control Registers */
1540         t = scnprintf (next, size, "%s version " DRIVER_VERSION
1541                         ", chiprev %04x, dma %s\n\n"
1542                         "devinit %03x fifoctl %08x gadget '%s'\n"
1543                         "pci irqenb0 %02x irqenb1 %08x "
1544                         "irqstat0 %04x irqstat1 %08x\n",
1545                         driver_name, dev->chiprev,
1546                         use_dma
1547                                 ? (use_dma_chaining ? "chaining" : "enabled")
1548                                 : "disabled",
1549                         readl (&dev->regs->devinit),
1550                         readl (&dev->regs->fifoctl),
1551                         s,
1552                         readl (&dev->regs->pciirqenb0),
1553                         readl (&dev->regs->pciirqenb1),
1554                         readl (&dev->regs->irqstat0),
1555                         readl (&dev->regs->irqstat1));
1556         size -= t;
1557         next += t;
1558
1559         /* USB Control Registers */
1560         t1 = readl (&dev->usb->usbctl);
1561         t2 = readl (&dev->usb->usbstat);
1562         if (t1 & (1 << VBUS_PIN)) {
1563                 if (t2 & (1 << HIGH_SPEED))
1564                         s = "high speed";
1565                 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1566                         s = "powered";
1567                 else
1568                         s = "full speed";
1569                 /* full speed bit (6) not working?? */
1570         } else
1571                         s = "not attached";
1572         t = scnprintf (next, size,
1573                         "stdrsp %08x usbctl %08x usbstat %08x "
1574                                 "addr 0x%02x (%s)\n",
1575                         readl (&dev->usb->stdrsp), t1, t2,
1576                         readl (&dev->usb->ouraddr), s);
1577         size -= t;
1578         next += t;
1579
1580         /* PCI Master Control Registers */
1581
1582         /* DMA Control Registers */
1583
1584         /* Configurable EP Control Registers */
1585         for (i = 0; i < 7; i++) {
1586                 struct net2280_ep       *ep;
1587
1588                 ep = &dev->ep [i];
1589                 if (i && !ep->desc)
1590                         continue;
1591
1592                 t1 = readl (&ep->regs->ep_cfg);
1593                 t2 = readl (&ep->regs->ep_rsp) & 0xff;
1594                 t = scnprintf (next, size,
1595                                 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1596                                         "irqenb %02x\n",
1597                                 ep->ep.name, t1, t2,
1598                                 (t2 & (1 << CLEAR_NAK_OUT_PACKETS))
1599                                         ? "NAK " : "",
1600                                 (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE))
1601                                         ? "hide " : "",
1602                                 (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR))
1603                                         ? "CRC " : "",
1604                                 (t2 & (1 << CLEAR_INTERRUPT_MODE))
1605                                         ? "interrupt " : "",
1606                                 (t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1607                                         ? "status " : "",
1608                                 (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE))
1609                                         ? "NAKmode " : "",
1610                                 (t2 & (1 << CLEAR_ENDPOINT_TOGGLE))
1611                                         ? "DATA1 " : "DATA0 ",
1612                                 (t2 & (1 << CLEAR_ENDPOINT_HALT))
1613                                         ? "HALT " : "",
1614                                 readl (&ep->regs->ep_irqenb));
1615                 size -= t;
1616                 next += t;
1617
1618                 t = scnprintf (next, size,
1619                                 "\tstat %08x avail %04x "
1620                                 "(ep%d%s-%s)%s\n",
1621                                 readl (&ep->regs->ep_stat),
1622                                 readl (&ep->regs->ep_avail),
1623                                 t1 & 0x0f, DIR_STRING (t1),
1624                                 type_string (t1 >> 8),
1625                                 ep->stopped ? "*" : "");
1626                 size -= t;
1627                 next += t;
1628
1629                 if (!ep->dma)
1630                         continue;
1631
1632                 t = scnprintf (next, size,
1633                                 "  dma\tctl %08x stat %08x count %08x\n"
1634                                 "\taddr %08x desc %08x\n",
1635                                 readl (&ep->dma->dmactl),
1636                                 readl (&ep->dma->dmastat),
1637                                 readl (&ep->dma->dmacount),
1638                                 readl (&ep->dma->dmaaddr),
1639                                 readl (&ep->dma->dmadesc));
1640                 size -= t;
1641                 next += t;
1642
1643         }
1644
1645         /* Indexed Registers */
1646                 // none yet
1647
1648         /* Statistics */
1649         t = scnprintf (next, size, "\nirqs:  ");
1650         size -= t;
1651         next += t;
1652         for (i = 0; i < 7; i++) {
1653                 struct net2280_ep       *ep;
1654
1655                 ep = &dev->ep [i];
1656                 if (i && !ep->irqs)
1657                         continue;
1658                 t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs);
1659                 size -= t;
1660                 next += t;
1661
1662         }
1663         t = scnprintf (next, size, "\n");
1664         size -= t;
1665         next += t;
1666
1667         spin_unlock_irqrestore (&dev->lock, flags);
1668
1669         return PAGE_SIZE - size;
1670 }
1671 static DEVICE_ATTR (registers, S_IRUGO, show_registers, NULL);
1672
1673 static ssize_t
1674 show_queues (struct device *_dev, struct device_attribute *attr, char *buf)
1675 {
1676         struct net2280          *dev;
1677         char                    *next;
1678         unsigned                size;
1679         unsigned long           flags;
1680         int                     i;
1681
1682         dev = dev_get_drvdata (_dev);
1683         next = buf;
1684         size = PAGE_SIZE;
1685         spin_lock_irqsave (&dev->lock, flags);
1686
1687         for (i = 0; i < 7; i++) {
1688                 struct net2280_ep               *ep = &dev->ep [i];
1689                 struct net2280_request          *req;
1690                 int                             t;
1691
1692                 if (i != 0) {
1693                         const struct usb_endpoint_descriptor    *d;
1694
1695                         d = ep->desc;
1696                         if (!d)
1697                                 continue;
1698                         t = d->bEndpointAddress;
1699                         t = scnprintf (next, size,
1700                                 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1701                                 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1702                                 (t & USB_DIR_IN) ? "in" : "out",
1703                                 ({ char *val;
1704                                  switch (d->bmAttributes & 0x03) {
1705                                  case USB_ENDPOINT_XFER_BULK:
1706                                         val = "bulk"; break;
1707                                  case USB_ENDPOINT_XFER_INT:
1708                                         val = "intr"; break;
1709                                  default:
1710                                         val = "iso"; break;
1711                                  }; val; }),
1712                                 le16_to_cpu (d->wMaxPacketSize) & 0x1fff,
1713                                 ep->dma ? "dma" : "pio", ep->fifo_size
1714                                 );
1715                 } else /* ep0 should only have one transfer queued */
1716                         t = scnprintf (next, size, "ep0 max 64 pio %s\n",
1717                                         ep->is_in ? "in" : "out");
1718                 if (t <= 0 || t > size)
1719                         goto done;
1720                 size -= t;
1721                 next += t;
1722
1723                 if (list_empty (&ep->queue)) {
1724                         t = scnprintf (next, size, "\t(nothing queued)\n");
1725                         if (t <= 0 || t > size)
1726                                 goto done;
1727                         size -= t;
1728                         next += t;
1729                         continue;
1730                 }
1731                 list_for_each_entry (req, &ep->queue, queue) {
1732                         if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc))
1733                                 t = scnprintf (next, size,
1734                                         "\treq %p len %d/%d "
1735                                         "buf %p (dmacount %08x)\n",
1736                                         &req->req, req->req.actual,
1737                                         req->req.length, req->req.buf,
1738                                         readl (&ep->dma->dmacount));
1739                         else
1740                                 t = scnprintf (next, size,
1741                                         "\treq %p len %d/%d buf %p\n",
1742                                         &req->req, req->req.actual,
1743                                         req->req.length, req->req.buf);
1744                         if (t <= 0 || t > size)
1745                                 goto done;
1746                         size -= t;
1747                         next += t;
1748
1749                         if (ep->dma) {
1750                                 struct net2280_dma      *td;
1751
1752                                 td = req->td;
1753                                 t = scnprintf (next, size, "\t    td %08x "
1754                                         " count %08x buf %08x desc %08x\n",
1755                                         (u32) req->td_dma,
1756                                         le32_to_cpu (td->dmacount),
1757                                         le32_to_cpu (td->dmaaddr),
1758                                         le32_to_cpu (td->dmadesc));
1759                                 if (t <= 0 || t > size)
1760                                         goto done;
1761                                 size -= t;
1762                                 next += t;
1763                         }
1764                 }
1765         }
1766
1767 done:
1768         spin_unlock_irqrestore (&dev->lock, flags);
1769         return PAGE_SIZE - size;
1770 }
1771 static DEVICE_ATTR (queues, S_IRUGO, show_queues, NULL);
1772
1773
1774 #else
1775
1776 #define device_create_file(a,b) (0)
1777 #define device_remove_file(a,b) do { } while (0)
1778
1779 #endif
1780
1781 /*-------------------------------------------------------------------------*/
1782
1783 /* another driver-specific mode might be a request type doing dma
1784  * to/from another device fifo instead of to/from memory.
1785  */
1786
1787 static void set_fifo_mode (struct net2280 *dev, int mode)
1788 {
1789         /* keeping high bits preserves BAR2 */
1790         writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1791
1792         /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1793         INIT_LIST_HEAD (&dev->gadget.ep_list);
1794         list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list);
1795         list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list);
1796         switch (mode) {
1797         case 0:
1798                 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1799                 list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list);
1800                 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024;
1801                 break;
1802         case 1:
1803                 dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048;
1804                 break;
1805         case 2:
1806                 list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list);
1807                 dev->ep [1].fifo_size = 2048;
1808                 dev->ep [2].fifo_size = 1024;
1809                 break;
1810         }
1811         /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1812         list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list);
1813         list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list);
1814 }
1815
1816 /* just declare this in any driver that really need it */
1817 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
1818
1819 /**
1820  * net2280_set_fifo_mode - change allocation of fifo buffers
1821  * @gadget: access to the net2280 device that will be updated
1822  * @mode: 0 for default, four 1kB buffers (ep-a through ep-d);
1823  *      1 for two 2kB buffers (ep-a and ep-b only);
1824  *      2 for one 2kB buffer (ep-a) and two 1kB ones (ep-b, ep-c).
1825  *
1826  * returns zero on success, else negative errno.  when this succeeds,
1827  * the contents of gadget->ep_list may have changed.
1828  *
1829  * you may only call this function when endpoints a-d are all disabled.
1830  * use it whenever extra hardware buffering can help performance, such
1831  * as before enabling "high bandwidth" interrupt endpoints that use
1832  * maxpacket bigger than 512 (when double buffering would otherwise
1833  * be unavailable).
1834  */
1835 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
1836 {
1837         int                     i;
1838         struct net2280          *dev;
1839         int                     status = 0;
1840         unsigned long           flags;
1841
1842         if (!gadget)
1843                 return -ENODEV;
1844         dev = container_of (gadget, struct net2280, gadget);
1845
1846         spin_lock_irqsave (&dev->lock, flags);
1847
1848         for (i = 1; i <= 4; i++)
1849                 if (dev->ep [i].desc) {
1850                         status = -EINVAL;
1851                         break;
1852                 }
1853         if (mode < 0 || mode > 2)
1854                 status = -EINVAL;
1855         if (status == 0)
1856                 set_fifo_mode (dev, mode);
1857         spin_unlock_irqrestore (&dev->lock, flags);
1858
1859         if (status == 0) {
1860                 if (mode == 1)
1861                         DEBUG (dev, "fifo:  ep-a 2K, ep-b 2K\n");
1862                 else if (mode == 2)
1863                         DEBUG (dev, "fifo:  ep-a 2K, ep-b 1K, ep-c 1K\n");
1864                 /* else all are 1K */
1865         }
1866         return status;
1867 }
1868 EXPORT_SYMBOL (net2280_set_fifo_mode);
1869
1870 /*-------------------------------------------------------------------------*/
1871
1872 /* keeping it simple:
1873  * - one bus driver, initted first;
1874  * - one function driver, initted second
1875  *
1876  * most of the work to support multiple net2280 controllers would
1877  * be to associate this gadget driver (yes?) with all of them, or
1878  * perhaps to bind specific drivers to specific devices.
1879  */
1880
1881 static struct net2280   *the_controller;
1882
1883 static void usb_reset (struct net2280 *dev)
1884 {
1885         u32     tmp;
1886
1887         dev->gadget.speed = USB_SPEED_UNKNOWN;
1888         (void) readl (&dev->usb->usbctl);
1889
1890         net2280_led_init (dev);
1891
1892         /* disable automatic responses, and irqs */
1893         writel (0, &dev->usb->stdrsp);
1894         writel (0, &dev->regs->pciirqenb0);
1895         writel (0, &dev->regs->pciirqenb1);
1896
1897         /* clear old dma and irq state */
1898         for (tmp = 0; tmp < 4; tmp++) {
1899                 struct net2280_ep       *ep = &dev->ep [tmp + 1];
1900
1901                 if (ep->dma)
1902                         abort_dma (ep);
1903         }
1904         writel (~0, &dev->regs->irqstat0),
1905         writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
1906
1907         /* reset, and enable pci */
1908         tmp = readl (&dev->regs->devinit)
1909                 | (1 << PCI_ENABLE)
1910                 | (1 << FIFO_SOFT_RESET)
1911                 | (1 << USB_SOFT_RESET)
1912                 | (1 << M8051_RESET);
1913         writel (tmp, &dev->regs->devinit);
1914
1915         /* standard fifo and endpoint allocations */
1916         set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0);
1917 }
1918
1919 static void usb_reinit (struct net2280 *dev)
1920 {
1921         u32     tmp;
1922         int     init_dma;
1923
1924         /* use_dma changes are ignored till next device re-init */
1925         init_dma = use_dma;
1926
1927         /* basic endpoint init */
1928         for (tmp = 0; tmp < 7; tmp++) {
1929                 struct net2280_ep       *ep = &dev->ep [tmp];
1930
1931                 ep->ep.name = ep_name [tmp];
1932                 ep->dev = dev;
1933                 ep->num = tmp;
1934
1935                 if (tmp > 0 && tmp <= 4) {
1936                         ep->fifo_size = 1024;
1937                         if (init_dma)
1938                                 ep->dma = &dev->dma [tmp - 1];
1939                 } else
1940                         ep->fifo_size = 64;
1941                 ep->regs = &dev->epregs [tmp];
1942                 ep_reset (dev->regs, ep);
1943         }
1944         dev->ep [0].ep.maxpacket = 64;
1945         dev->ep [5].ep.maxpacket = 64;
1946         dev->ep [6].ep.maxpacket = 64;
1947
1948         dev->gadget.ep0 = &dev->ep [0].ep;
1949         dev->ep [0].stopped = 0;
1950         INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1951
1952         /* we want to prevent lowlevel/insecure access from the USB host,
1953          * but erratum 0119 means this enable bit is ignored
1954          */
1955         for (tmp = 0; tmp < 5; tmp++)
1956                 writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg);
1957 }
1958
1959 static void ep0_start (struct net2280 *dev)
1960 {
1961         writel (  (1 << CLEAR_EP_HIDE_STATUS_PHASE)
1962                 | (1 << CLEAR_NAK_OUT_PACKETS)
1963                 | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)
1964                 , &dev->epregs [0].ep_rsp);
1965
1966         /*
1967          * hardware optionally handles a bunch of standard requests
1968          * that the API hides from drivers anyway.  have it do so.
1969          * endpoint status/features are handled in software, to
1970          * help pass tests for some dubious behavior.
1971          */
1972         writel (  (1 << SET_TEST_MODE)
1973                 | (1 << SET_ADDRESS)
1974                 | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP)
1975                 | (1 << GET_DEVICE_STATUS)
1976                 | (1 << GET_INTERFACE_STATUS)
1977                 , &dev->usb->stdrsp);
1978         writel (  (1 << USB_ROOT_PORT_WAKEUP_ENABLE)
1979                 | (1 << SELF_POWERED_USB_DEVICE)
1980                 | (1 << REMOTE_WAKEUP_SUPPORT)
1981                 | (dev->softconnect << USB_DETECT_ENABLE)
1982                 | (1 << SELF_POWERED_STATUS)
1983                 , &dev->usb->usbctl);
1984
1985         /* enable irqs so we can see ep0 and general operation  */
1986         writel (  (1 << SETUP_PACKET_INTERRUPT_ENABLE)
1987                 | (1 << ENDPOINT_0_INTERRUPT_ENABLE)
1988                 , &dev->regs->pciirqenb0);
1989         writel (  (1 << PCI_INTERRUPT_ENABLE)
1990                 | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE)
1991                 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE)
1992                 | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE)
1993                 | (1 << VBUS_INTERRUPT_ENABLE)
1994                 | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE)
1995                 | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE)
1996                 , &dev->regs->pciirqenb1);
1997
1998         /* don't leave any writes posted */
1999         (void) readl (&dev->usb->usbctl);
2000 }
2001
2002 /* when a driver is successfully registered, it will receive
2003  * control requests including set_configuration(), which enables
2004  * non-control requests.  then usb traffic follows until a
2005  * disconnect is reported.  then a host may connect again, or
2006  * the driver might get unbound.
2007  */
2008 int usb_gadget_register_driver (struct usb_gadget_driver *driver)
2009 {
2010         struct net2280          *dev = the_controller;
2011         int                     retval;
2012         unsigned                i;
2013
2014         /* insist on high speed support from the driver, since
2015          * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2016          * "must not be used in normal operation"
2017          */
2018         if (!driver
2019                         || driver->speed != USB_SPEED_HIGH
2020                         || !driver->bind
2021                         || !driver->setup)
2022                 return -EINVAL;
2023         if (!dev)
2024                 return -ENODEV;
2025         if (dev->driver)
2026                 return -EBUSY;
2027
2028         for (i = 0; i < 7; i++)
2029                 dev->ep [i].irqs = 0;
2030
2031         /* hook up the driver ... */
2032         dev->softconnect = 1;
2033         driver->driver.bus = NULL;
2034         dev->driver = driver;
2035         dev->gadget.dev.driver = &driver->driver;
2036         retval = driver->bind (&dev->gadget);
2037         if (retval) {
2038                 DEBUG (dev, "bind to driver %s --> %d\n",
2039                                 driver->driver.name, retval);
2040                 dev->driver = NULL;
2041                 dev->gadget.dev.driver = NULL;
2042                 return retval;
2043         }
2044
2045         retval = device_create_file (&dev->pdev->dev, &dev_attr_function);
2046         if (retval) goto err_unbind;
2047         retval = device_create_file (&dev->pdev->dev, &dev_attr_queues);
2048         if (retval) goto err_func;
2049
2050         /* ... then enable host detection and ep0; and we're ready
2051          * for set_configuration as well as eventual disconnect.
2052          */
2053         net2280_led_active (dev, 1);
2054         ep0_start (dev);
2055
2056         DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n",
2057                         driver->driver.name,
2058                         readl (&dev->usb->usbctl),
2059                         readl (&dev->usb->stdrsp));
2060
2061         /* pci writes may still be posted */
2062         return 0;
2063
2064 err_func:
2065         device_remove_file (&dev->pdev->dev, &dev_attr_function);
2066 err_unbind:
2067         driver->unbind (&dev->gadget);
2068         dev->gadget.dev.driver = NULL;
2069         dev->driver = NULL;
2070         return retval;
2071 }
2072 EXPORT_SYMBOL (usb_gadget_register_driver);
2073
2074 static void
2075 stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver)
2076 {
2077         int                     i;
2078
2079         /* don't disconnect if it's not connected */
2080         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2081                 driver = NULL;
2082
2083         /* stop hardware; prevent new request submissions;
2084          * and kill any outstanding requests.
2085          */
2086         usb_reset (dev);
2087         for (i = 0; i < 7; i++)
2088                 nuke (&dev->ep [i]);
2089
2090         /* report disconnect; the driver is already quiesced */
2091         if (driver) {
2092                 spin_unlock (&dev->lock);
2093                 driver->disconnect (&dev->gadget);
2094                 spin_lock (&dev->lock);
2095         }
2096
2097         usb_reinit (dev);
2098 }
2099
2100 int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
2101 {
2102         struct net2280  *dev = the_controller;
2103         unsigned long   flags;
2104
2105         if (!dev)
2106                 return -ENODEV;
2107         if (!driver || driver != dev->driver || !driver->unbind)
2108                 return -EINVAL;
2109
2110         spin_lock_irqsave (&dev->lock, flags);
2111         stop_activity (dev, driver);
2112         spin_unlock_irqrestore (&dev->lock, flags);
2113
2114         net2280_pullup (&dev->gadget, 0);
2115
2116         driver->unbind (&dev->gadget);
2117         dev->gadget.dev.driver = NULL;
2118         dev->driver = NULL;
2119
2120         net2280_led_active (dev, 0);
2121         device_remove_file (&dev->pdev->dev, &dev_attr_function);
2122         device_remove_file (&dev->pdev->dev, &dev_attr_queues);
2123
2124         DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name);
2125         return 0;
2126 }
2127 EXPORT_SYMBOL (usb_gadget_unregister_driver);
2128
2129
2130 /*-------------------------------------------------------------------------*/
2131
2132 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2133  * also works for dma-capable endpoints, in pio mode or just
2134  * to manually advance the queue after short OUT transfers.
2135  */
2136 static void handle_ep_small (struct net2280_ep *ep)
2137 {
2138         struct net2280_request  *req;
2139         u32                     t;
2140         /* 0 error, 1 mid-data, 2 done */
2141         int                     mode = 1;
2142
2143         if (!list_empty (&ep->queue))
2144                 req = list_entry (ep->queue.next,
2145                         struct net2280_request, queue);
2146         else
2147                 req = NULL;
2148
2149         /* ack all, and handle what we care about */
2150         t = readl (&ep->regs->ep_stat);
2151         ep->irqs++;
2152 #if 0
2153         VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n",
2154                         ep->ep.name, t, req ? &req->req : 0);
2155 #endif
2156         if (!ep->is_in || ep->dev->pdev->device == 0x2280)
2157                 writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat);
2158         else
2159                 /* Added for 2282 */
2160                 writel (t, &ep->regs->ep_stat);
2161
2162         /* for ep0, monitor token irqs to catch data stage length errors
2163          * and to synchronize on status.
2164          *
2165          * also, to defer reporting of protocol stalls ... here's where
2166          * data or status first appears, handling stalls here should never
2167          * cause trouble on the host side..
2168          *
2169          * control requests could be slightly faster without token synch for
2170          * status, but status can jam up that way.
2171          */
2172         if (unlikely (ep->num == 0)) {
2173                 if (ep->is_in) {
2174                         /* status; stop NAKing */
2175                         if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) {
2176                                 if (ep->dev->protocol_stall) {
2177                                         ep->stopped = 1;
2178                                         set_halt (ep);
2179                                 }
2180                                 if (!req)
2181                                         allow_status (ep);
2182                                 mode = 2;
2183                         /* reply to extra IN data tokens with a zlp */
2184                         } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2185                                 if (ep->dev->protocol_stall) {
2186                                         ep->stopped = 1;
2187                                         set_halt (ep);
2188                                         mode = 2;
2189                                 } else if (ep->responded &&
2190                                                 !req && !ep->stopped)
2191                                         write_fifo (ep, NULL);
2192                         }
2193                 } else {
2194                         /* status; stop NAKing */
2195                         if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) {
2196                                 if (ep->dev->protocol_stall) {
2197                                         ep->stopped = 1;
2198                                         set_halt (ep);
2199                                 }
2200                                 mode = 2;
2201                         /* an extra OUT token is an error */
2202                         } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT))
2203                                         && req
2204                                         && req->req.actual == req->req.length)
2205                                         || (ep->responded && !req)) {
2206                                 ep->dev->protocol_stall = 1;
2207                                 set_halt (ep);
2208                                 ep->stopped = 1;
2209                                 if (req)
2210                                         done (ep, req, -EOVERFLOW);
2211                                 req = NULL;
2212                         }
2213                 }
2214         }
2215
2216         if (unlikely (!req))
2217                 return;
2218
2219         /* manual DMA queue advance after short OUT */
2220         if (likely (ep->dma != 0)) {
2221                 if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2222                         u32     count;
2223                         int     stopped = ep->stopped;
2224
2225                         /* TRANSFERRED works around OUT_DONE erratum 0112.
2226                          * we expect (N <= maxpacket) bytes; host wrote M.
2227                          * iff (M < N) we won't ever see a DMA interrupt.
2228                          */
2229                         ep->stopped = 1;
2230                         for (count = 0; ; t = readl (&ep->regs->ep_stat)) {
2231
2232                                 /* any preceding dma transfers must finish.
2233                                  * dma handles (M >= N), may empty the queue
2234                                  */
2235                                 scan_dma_completions (ep);
2236                                 if (unlikely (list_empty (&ep->queue)
2237                                                 || ep->out_overflow)) {
2238                                         req = NULL;
2239                                         break;
2240                                 }
2241                                 req = list_entry (ep->queue.next,
2242                                         struct net2280_request, queue);
2243
2244                                 /* here either (M < N), a "real" short rx;
2245                                  * or (M == N) and the queue didn't empty
2246                                  */
2247                                 if (likely (t & (1 << FIFO_EMPTY))) {
2248                                         count = readl (&ep->dma->dmacount);
2249                                         count &= DMA_BYTE_COUNT_MASK;
2250                                         if (readl (&ep->dma->dmadesc)
2251                                                         != req->td_dma)
2252                                                 req = NULL;
2253                                         break;
2254                                 }
2255                                 udelay(1);
2256                         }
2257
2258                         /* stop DMA, leave ep NAKing */
2259                         writel ((1 << DMA_ABORT), &ep->dma->dmastat);
2260                         spin_stop_dma (ep->dma);
2261
2262                         if (likely (req)) {
2263                                 req->td->dmacount = 0;
2264                                 t = readl (&ep->regs->ep_avail);
2265                                 dma_done (ep, req, count,
2266                                         (ep->out_overflow || t)
2267                                                 ? -EOVERFLOW : 0);
2268                         }
2269
2270                         /* also flush to prevent erratum 0106 trouble */
2271                         if (unlikely (ep->out_overflow
2272                                         || (ep->dev->chiprev == 0x0100
2273                                                 && ep->dev->gadget.speed
2274                                                         == USB_SPEED_FULL))) {
2275                                 out_flush (ep);
2276                                 ep->out_overflow = 0;
2277                         }
2278
2279                         /* (re)start dma if needed, stop NAKing */
2280                         ep->stopped = stopped;
2281                         if (!list_empty (&ep->queue))
2282                                 restart_dma (ep);
2283                 } else
2284                         DEBUG (ep->dev, "%s dma ep_stat %08x ??\n",
2285                                         ep->ep.name, t);
2286                 return;
2287
2288         /* data packet(s) received (in the fifo, OUT) */
2289         } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) {
2290                 if (read_fifo (ep, req) && ep->num != 0)
2291                         mode = 2;
2292
2293         /* data packet(s) transmitted (IN) */
2294         } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2295                 unsigned        len;
2296
2297                 len = req->req.length - req->req.actual;
2298                 if (len > ep->ep.maxpacket)
2299                         len = ep->ep.maxpacket;
2300                 req->req.actual += len;
2301
2302                 /* if we wrote it all, we're usually done */
2303                 if (req->req.actual == req->req.length) {
2304                         if (ep->num == 0) {
2305                                 /* send zlps until the status stage */
2306                         } else if (!req->req.zero || len != ep->ep.maxpacket)
2307                                 mode = 2;
2308                 }
2309
2310         /* there was nothing to do ...  */
2311         } else if (mode == 1)
2312                 return;
2313
2314         /* done */
2315         if (mode == 2) {
2316                 /* stream endpoints often resubmit/unlink in completion */
2317                 done (ep, req, 0);
2318
2319                 /* maybe advance queue to next request */
2320                 if (ep->num == 0) {
2321                         /* NOTE:  net2280 could let gadget driver start the
2322                          * status stage later. since not all controllers let
2323                          * them control that, the api doesn't (yet) allow it.
2324                          */
2325                         if (!ep->stopped)
2326                                 allow_status (ep);
2327                         req = NULL;
2328                 } else {
2329                         if (!list_empty (&ep->queue) && !ep->stopped)
2330                                 req = list_entry (ep->queue.next,
2331                                         struct net2280_request, queue);
2332                         else
2333                                 req = NULL;
2334                         if (req && !ep->is_in)
2335                                 stop_out_naking (ep);
2336                 }
2337         }
2338
2339         /* is there a buffer for the next packet?
2340          * for best streaming performance, make sure there is one.
2341          */
2342         if (req && !ep->stopped) {
2343
2344                 /* load IN fifo with next packet (may be zlp) */
2345                 if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT))
2346                         write_fifo (ep, &req->req);
2347         }
2348 }
2349
2350 static struct net2280_ep *
2351 get_ep_by_addr (struct net2280 *dev, u16 wIndex)
2352 {
2353         struct net2280_ep       *ep;
2354
2355         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2356                 return &dev->ep [0];
2357         list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) {
2358                 u8      bEndpointAddress;
2359
2360                 if (!ep->desc)
2361                         continue;
2362                 bEndpointAddress = ep->desc->bEndpointAddress;
2363                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2364                         continue;
2365                 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2366                         return ep;
2367         }
2368         return NULL;
2369 }
2370
2371 static void handle_stat0_irqs (struct net2280 *dev, u32 stat)
2372 {
2373         struct net2280_ep       *ep;
2374         u32                     num, scratch;
2375
2376         /* most of these don't need individual acks */
2377         stat &= ~(1 << INTA_ASSERTED);
2378         if (!stat)
2379                 return;
2380         // DEBUG (dev, "irqstat0 %04x\n", stat);
2381
2382         /* starting a control request? */
2383         if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) {
2384                 union {
2385                         u32                     raw [2];
2386                         struct usb_ctrlrequest  r;
2387                 } u;
2388                 int                             tmp;
2389                 struct net2280_request          *req;
2390
2391                 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
2392                         if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED))
2393                                 dev->gadget.speed = USB_SPEED_HIGH;
2394                         else
2395                                 dev->gadget.speed = USB_SPEED_FULL;
2396                         net2280_led_speed (dev, dev->gadget.speed);
2397                         DEBUG (dev, "%s speed\n",
2398                                 (dev->gadget.speed == USB_SPEED_HIGH)
2399                                         ? "high" : "full");
2400                 }
2401
2402                 ep = &dev->ep [0];
2403                 ep->irqs++;
2404
2405                 /* make sure any leftover request state is cleared */
2406                 stat &= ~(1 << ENDPOINT_0_INTERRUPT);
2407                 while (!list_empty (&ep->queue)) {
2408                         req = list_entry (ep->queue.next,
2409                                         struct net2280_request, queue);
2410                         done (ep, req, (req->req.actual == req->req.length)
2411                                                 ? 0 : -EPROTO);
2412                 }
2413                 ep->stopped = 0;
2414                 dev->protocol_stall = 0;
2415
2416                 if (ep->dev->pdev->device == 0x2280)
2417                         tmp = (1 << FIFO_OVERFLOW)
2418                                 | (1 << FIFO_UNDERFLOW);
2419                 else
2420                         tmp = 0;
2421
2422                 writel (tmp | (1 << TIMEOUT)
2423                         | (1 << USB_STALL_SENT)
2424                         | (1 << USB_IN_NAK_SENT)
2425                         | (1 << USB_IN_ACK_RCVD)
2426                         | (1 << USB_OUT_PING_NAK_SENT)
2427                         | (1 << USB_OUT_ACK_SENT)
2428                         | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT)
2429                         | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)
2430                         | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2431                         | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2432                         | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2433                         | (1 << DATA_IN_TOKEN_INTERRUPT)
2434                         , &ep->regs->ep_stat);
2435                 u.raw [0] = readl (&dev->usb->setup0123);
2436                 u.raw [1] = readl (&dev->usb->setup4567);
2437
2438                 cpu_to_le32s (&u.raw [0]);
2439                 cpu_to_le32s (&u.raw [1]);
2440
2441                 tmp = 0;
2442
2443 #define w_value         le16_to_cpup (&u.r.wValue)
2444 #define w_index         le16_to_cpup (&u.r.wIndex)
2445 #define w_length        le16_to_cpup (&u.r.wLength)
2446
2447                 /* ack the irq */
2448                 writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0);
2449                 stat ^= (1 << SETUP_PACKET_INTERRUPT);
2450
2451                 /* watch control traffic at the token level, and force
2452                  * synchronization before letting the status stage happen.
2453                  * FIXME ignore tokens we'll NAK, until driver responds.
2454                  * that'll mean a lot less irqs for some drivers.
2455                  */
2456                 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
2457                 if (ep->is_in) {
2458                         scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
2459                                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2460                                 | (1 << DATA_IN_TOKEN_INTERRUPT);
2461                         stop_out_naking (ep);
2462                 } else
2463                         scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT)
2464                                 | (1 << DATA_OUT_PING_TOKEN_INTERRUPT)
2465                                 | (1 << DATA_IN_TOKEN_INTERRUPT);
2466                 writel (scratch, &dev->epregs [0].ep_irqenb);
2467
2468                 /* we made the hardware handle most lowlevel requests;
2469                  * everything else goes uplevel to the gadget code.
2470                  */
2471                 ep->responded = 1;
2472                 switch (u.r.bRequest) {
2473                 case USB_REQ_GET_STATUS: {
2474                         struct net2280_ep       *e;
2475                         __le32                  status;
2476
2477                         /* hw handles device and interface status */
2478                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
2479                                 goto delegate;
2480                         if ((e = get_ep_by_addr (dev, w_index)) == 0
2481                                         || w_length > 2)
2482                                 goto do_stall;
2483
2484                         if (readl (&e->regs->ep_rsp)
2485                                         & (1 << SET_ENDPOINT_HALT))
2486                                 status = __constant_cpu_to_le32 (1);
2487                         else
2488                                 status = __constant_cpu_to_le32 (0);
2489
2490                         /* don't bother with a request object! */
2491                         writel (0, &dev->epregs [0].ep_irqenb);
2492                         set_fifo_bytecount (ep, w_length);
2493                         writel ((__force u32)status, &dev->epregs [0].ep_data);
2494                         allow_status (ep);
2495                         VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status);
2496                         goto next_endpoints;
2497                         }
2498                         break;
2499                 case USB_REQ_CLEAR_FEATURE: {
2500                         struct net2280_ep       *e;
2501
2502                         /* hw handles device features */
2503                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2504                                 goto delegate;
2505                         if (w_value != USB_ENDPOINT_HALT
2506                                         || w_length != 0)
2507                                 goto do_stall;
2508                         if ((e = get_ep_by_addr (dev, w_index)) == 0)
2509                                 goto do_stall;
2510                         clear_halt (e);
2511                         allow_status (ep);
2512                         VDEBUG (dev, "%s clear halt\n", ep->ep.name);
2513                         goto next_endpoints;
2514                         }
2515                         break;
2516                 case USB_REQ_SET_FEATURE: {
2517                         struct net2280_ep       *e;
2518
2519                         /* hw handles device features */
2520                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
2521                                 goto delegate;
2522                         if (w_value != USB_ENDPOINT_HALT
2523                                         || w_length != 0)
2524                                 goto do_stall;
2525                         if ((e = get_ep_by_addr (dev, w_index)) == 0)
2526                                 goto do_stall;
2527                         set_halt (e);
2528                         allow_status (ep);
2529                         VDEBUG (dev, "%s set halt\n", ep->ep.name);
2530                         goto next_endpoints;
2531                         }
2532                         break;
2533                 default:
2534 delegate:
2535                         VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x"
2536                                 "ep_cfg %08x\n",
2537                                 u.r.bRequestType, u.r.bRequest,
2538                                 w_value, w_index, w_length,
2539                                 readl (&ep->regs->ep_cfg));
2540                         ep->responded = 0;
2541                         spin_unlock (&dev->lock);
2542                         tmp = dev->driver->setup (&dev->gadget, &u.r);
2543                         spin_lock (&dev->lock);
2544                 }
2545
2546                 /* stall ep0 on error */
2547                 if (tmp < 0) {
2548 do_stall:
2549                         VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n",
2550                                         u.r.bRequestType, u.r.bRequest, tmp);
2551                         dev->protocol_stall = 1;
2552                 }
2553
2554                 /* some in/out token irq should follow; maybe stall then.
2555                  * driver must queue a request (even zlp) or halt ep0
2556                  * before the host times out.
2557                  */
2558         }
2559
2560 #undef  w_value
2561 #undef  w_index
2562 #undef  w_length
2563
2564 next_endpoints:
2565         /* endpoint data irq ? */
2566         scratch = stat & 0x7f;
2567         stat &= ~0x7f;
2568         for (num = 0; scratch; num++) {
2569                 u32             t;
2570
2571                 /* do this endpoint's FIFO and queue need tending? */
2572                 t = 1 << num;
2573                 if ((scratch & t) == 0)
2574                         continue;
2575                 scratch ^= t;
2576
2577                 ep = &dev->ep [num];
2578                 handle_ep_small (ep);
2579         }
2580
2581         if (stat)
2582                 DEBUG (dev, "unhandled irqstat0 %08x\n", stat);
2583 }
2584
2585 #define DMA_INTERRUPTS ( \
2586                   (1 << DMA_D_INTERRUPT) \
2587                 | (1 << DMA_C_INTERRUPT) \
2588                 | (1 << DMA_B_INTERRUPT) \
2589                 | (1 << DMA_A_INTERRUPT))
2590 #define PCI_ERROR_INTERRUPTS ( \
2591                   (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \
2592                 | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \
2593                 | (1 << PCI_RETRY_ABORT_INTERRUPT))
2594
2595 static void handle_stat1_irqs (struct net2280 *dev, u32 stat)
2596 {
2597         struct net2280_ep       *ep;
2598         u32                     tmp, num, mask, scratch;
2599
2600         /* after disconnect there's nothing else to do! */
2601         tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT);
2602         mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED);
2603
2604         /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
2605          * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRRUPT set and
2606          * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
2607          * only indicates a change in the reset state).
2608          */
2609         if (stat & tmp) {
2610                 writel (tmp, &dev->regs->irqstat1);
2611                 if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT))
2612                                         && ((readl (&dev->usb->usbstat) & mask)
2613                                                         == 0))
2614                                 || ((readl (&dev->usb->usbctl)
2615                                         & (1 << VBUS_PIN)) == 0)
2616                             ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) {
2617                         DEBUG (dev, "disconnect %s\n",
2618                                         dev->driver->driver.name);
2619                         stop_activity (dev, dev->driver);
2620                         ep0_start (dev);
2621                         return;
2622                 }
2623                 stat &= ~tmp;
2624
2625                 /* vBUS can bounce ... one of many reasons to ignore the
2626                  * notion of hotplug events on bus connect/disconnect!
2627                  */
2628                 if (!stat)
2629                         return;
2630         }
2631
2632         /* NOTE: chip stays in PCI D0 state for now, but it could
2633          * enter D1 to save more power
2634          */
2635         tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT);
2636         if (stat & tmp) {
2637                 writel (tmp, &dev->regs->irqstat1);
2638                 if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) {
2639                         if (dev->driver->suspend)
2640                                 dev->driver->suspend (&dev->gadget);
2641                         if (!enable_suspend)
2642                                 stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT);
2643                 } else {
2644                         if (dev->driver->resume)
2645                                 dev->driver->resume (&dev->gadget);
2646                         /* at high speed, note erratum 0133 */
2647                 }
2648                 stat &= ~tmp;
2649         }
2650
2651         /* clear any other status/irqs */
2652         if (stat)
2653                 writel (stat, &dev->regs->irqstat1);
2654
2655         /* some status we can just ignore */
2656         if (dev->pdev->device == 0x2280)
2657                 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2658                           | (1 << SUSPEND_REQUEST_INTERRUPT)
2659                           | (1 << RESUME_INTERRUPT)
2660                           | (1 << SOF_INTERRUPT));
2661         else
2662                 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2663                           | (1 << RESUME_INTERRUPT)
2664                           | (1 << SOF_DOWN_INTERRUPT)
2665                           | (1 << SOF_INTERRUPT));
2666
2667         if (!stat)
2668                 return;
2669         // DEBUG (dev, "irqstat1 %08x\n", stat);
2670
2671         /* DMA status, for ep-{a,b,c,d} */
2672         scratch = stat & DMA_INTERRUPTS;
2673         stat &= ~DMA_INTERRUPTS;
2674         scratch >>= 9;
2675         for (num = 0; scratch; num++) {
2676                 struct net2280_dma_regs __iomem *dma;
2677
2678                 tmp = 1 << num;
2679                 if ((tmp & scratch) == 0)
2680                         continue;
2681                 scratch ^= tmp;
2682
2683                 ep = &dev->ep [num + 1];
2684                 dma = ep->dma;
2685
2686                 if (!dma)
2687                         continue;
2688
2689                 /* clear ep's dma status */
2690                 tmp = readl (&dma->dmastat);
2691                 writel (tmp, &dma->dmastat);
2692
2693                 /* chaining should stop on abort, short OUT from fifo,
2694                  * or (stat0 codepath) short OUT transfer.
2695                  */
2696                 if (!use_dma_chaining) {
2697                         if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT))
2698                                         == 0) {
2699                                 DEBUG (ep->dev, "%s no xact done? %08x\n",
2700                                         ep->ep.name, tmp);
2701                                 continue;
2702                         }
2703                         stop_dma (ep->dma);
2704                 }
2705
2706                 /* OUT transfers terminate when the data from the
2707                  * host is in our memory.  Process whatever's done.
2708                  * On this path, we know transfer's last packet wasn't
2709                  * less than req->length. NAK_OUT_PACKETS may be set,
2710                  * or the FIFO may already be holding new packets.
2711                  *
2712                  * IN transfers can linger in the FIFO for a very
2713                  * long time ... we ignore that for now, accounting
2714                  * precisely (like PIO does) needs per-packet irqs
2715                  */
2716                 scan_dma_completions (ep);
2717
2718                 /* disable dma on inactive queues; else maybe restart */
2719                 if (list_empty (&ep->queue)) {
2720                         if (use_dma_chaining)
2721                                 stop_dma (ep->dma);
2722                 } else {
2723                         tmp = readl (&dma->dmactl);
2724                         if (!use_dma_chaining
2725                                         || (tmp & (1 << DMA_ENABLE)) == 0)
2726                                 restart_dma (ep);
2727                         else if (ep->is_in && use_dma_chaining) {
2728                                 struct net2280_request  *req;
2729                                 __le32                  dmacount;
2730
2731                                 /* the descriptor at the head of the chain
2732                                  * may still have VALID_BIT clear; that's
2733                                  * used to trigger changing DMA_FIFO_VALIDATE
2734                                  * (affects automagic zlp writes).
2735                                  */
2736                                 req = list_entry (ep->queue.next,
2737                                                 struct net2280_request, queue);
2738                                 dmacount = req->td->dmacount;
2739                                 dmacount &= __constant_cpu_to_le32 (
2740                                                 (1 << VALID_BIT)
2741                                                 | DMA_BYTE_COUNT_MASK);
2742                                 if (dmacount && (dmacount & valid_bit) == 0)
2743                                         restart_dma (ep);
2744                         }
2745                 }
2746                 ep->irqs++;
2747         }
2748
2749         /* NOTE:  there are other PCI errors we might usefully notice.
2750          * if they appear very often, here's where to try recovering.
2751          */
2752         if (stat & PCI_ERROR_INTERRUPTS) {
2753                 ERROR (dev, "pci dma error; stat %08x\n", stat);
2754                 stat &= ~PCI_ERROR_INTERRUPTS;
2755                 /* these are fatal errors, but "maybe" they won't
2756                  * happen again ...
2757                  */
2758                 stop_activity (dev, dev->driver);
2759                 ep0_start (dev);
2760                 stat = 0;
2761         }
2762
2763         if (stat)
2764                 DEBUG (dev, "unhandled irqstat1 %08x\n", stat);
2765 }
2766
2767 static irqreturn_t net2280_irq (int irq, void *_dev)
2768 {
2769         struct net2280          *dev = _dev;
2770
2771         /* shared interrupt, not ours */
2772         if (!(readl(&dev->regs->irqstat0) & (1 << INTA_ASSERTED)))
2773                 return IRQ_NONE;
2774
2775         spin_lock (&dev->lock);
2776
2777         /* handle disconnect, dma, and more */
2778         handle_stat1_irqs (dev, readl (&dev->regs->irqstat1));
2779
2780         /* control requests and PIO */
2781         handle_stat0_irqs (dev, readl (&dev->regs->irqstat0));
2782
2783         spin_unlock (&dev->lock);
2784
2785         return IRQ_HANDLED;
2786 }
2787
2788 /*-------------------------------------------------------------------------*/
2789
2790 static void gadget_release (struct device *_dev)
2791 {
2792         struct net2280  *dev = dev_get_drvdata (_dev);
2793
2794         kfree (dev);
2795 }
2796
2797 /* tear down the binding between this driver and the pci device */
2798
2799 static void net2280_remove (struct pci_dev *pdev)
2800 {
2801         struct net2280          *dev = pci_get_drvdata (pdev);
2802
2803         BUG_ON(dev->driver);
2804
2805         /* then clean up the resources we allocated during probe() */
2806         net2280_led_shutdown (dev);
2807         if (dev->requests) {
2808                 int             i;
2809                 for (i = 1; i < 5; i++) {
2810                         if (!dev->ep [i].dummy)
2811                                 continue;
2812                         pci_pool_free (dev->requests, dev->ep [i].dummy,
2813                                         dev->ep [i].td_dma);
2814                 }
2815                 pci_pool_destroy (dev->requests);
2816         }
2817         if (dev->got_irq)
2818                 free_irq (pdev->irq, dev);
2819         if (dev->regs)
2820                 iounmap (dev->regs);
2821         if (dev->region)
2822                 release_mem_region (pci_resource_start (pdev, 0),
2823                                 pci_resource_len (pdev, 0));
2824         if (dev->enabled)
2825                 pci_disable_device (pdev);
2826         device_unregister (&dev->gadget.dev);
2827         device_remove_file (&pdev->dev, &dev_attr_registers);
2828         pci_set_drvdata (pdev, NULL);
2829
2830         INFO (dev, "unbind\n");
2831
2832         the_controller = NULL;
2833 }
2834
2835 /* wrap this driver around the specified device, but
2836  * don't respond over USB until a gadget driver binds to us.
2837  */
2838
2839 static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id)
2840 {
2841         struct net2280          *dev;
2842         unsigned long           resource, len;
2843         void                    __iomem *base = NULL;
2844         int                     retval, i;
2845
2846         /* if you want to support more than one controller in a system,
2847          * usb_gadget_driver_{register,unregister}() must change.
2848          */
2849         if (the_controller) {
2850                 dev_warn (&pdev->dev, "ignoring\n");
2851                 return -EBUSY;
2852         }
2853
2854         /* alloc, and start init */
2855         dev = kzalloc (sizeof *dev, GFP_KERNEL);
2856         if (dev == NULL){
2857                 retval = -ENOMEM;
2858                 goto done;
2859         }
2860
2861         pci_set_drvdata (pdev, dev);
2862         spin_lock_init (&dev->lock);
2863         dev->pdev = pdev;
2864         dev->gadget.ops = &net2280_ops;
2865         dev->gadget.is_dualspeed = 1;
2866
2867         /* the "gadget" abstracts/virtualizes the controller */
2868         strcpy (dev->gadget.dev.bus_id, "gadget");
2869         dev->gadget.dev.parent = &pdev->dev;
2870         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2871         dev->gadget.dev.release = gadget_release;
2872         dev->gadget.name = driver_name;
2873
2874         /* now all the pci goodies ... */
2875         if (pci_enable_device (pdev) < 0) {
2876                 retval = -ENODEV;
2877                 goto done;
2878         }
2879         dev->enabled = 1;
2880
2881         /* BAR 0 holds all the registers
2882          * BAR 1 is 8051 memory; unused here (note erratum 0103)
2883          * BAR 2 is fifo memory; unused here
2884          */
2885         resource = pci_resource_start (pdev, 0);
2886         len = pci_resource_len (pdev, 0);
2887         if (!request_mem_region (resource, len, driver_name)) {
2888                 DEBUG (dev, "controller already in use\n");
2889                 retval = -EBUSY;
2890                 goto done;
2891         }
2892         dev->region = 1;
2893
2894         /* FIXME provide firmware download interface to put
2895          * 8051 code into the chip, e.g. to turn on PCI PM.
2896          */
2897
2898         base = ioremap_nocache (resource, len);
2899         if (base == NULL) {
2900                 DEBUG (dev, "can't map memory\n");
2901                 retval = -EFAULT;
2902                 goto done;
2903         }
2904         dev->regs = (struct net2280_regs __iomem *) base;
2905         dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
2906         dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
2907         dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
2908         dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
2909         dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
2910
2911         /* put into initial config, link up all endpoints */
2912         writel (0, &dev->usb->usbctl);
2913         usb_reset (dev);
2914         usb_reinit (dev);
2915
2916         /* irq setup after old hardware is cleaned up */
2917         if (!pdev->irq) {
2918                 ERROR (dev, "No IRQ.  Check PCI setup!\n");
2919                 retval = -ENODEV;
2920                 goto done;
2921         }
2922
2923         if (request_irq (pdev->irq, net2280_irq, IRQF_SHARED, driver_name, dev)
2924                         != 0) {
2925                 ERROR (dev, "request interrupt %d failed\n", pdev->irq);
2926                 retval = -EBUSY;
2927                 goto done;
2928         }
2929         dev->got_irq = 1;
2930
2931         /* DMA setup */
2932         /* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
2933         dev->requests = pci_pool_create ("requests", pdev,
2934                 sizeof (struct net2280_dma),
2935                 0 /* no alignment requirements */,
2936                 0 /* or page-crossing issues */);
2937         if (!dev->requests) {
2938                 DEBUG (dev, "can't get request pool\n");
2939                 retval = -ENOMEM;
2940                 goto done;
2941         }
2942         for (i = 1; i < 5; i++) {
2943                 struct net2280_dma      *td;
2944
2945                 td = pci_pool_alloc (dev->requests, GFP_KERNEL,
2946                                 &dev->ep [i].td_dma);
2947                 if (!td) {
2948                         DEBUG (dev, "can't get dummy %d\n", i);
2949                         retval = -ENOMEM;
2950                         goto done;
2951                 }
2952                 td->dmacount = 0;       /* not VALID */
2953                 td->dmaaddr = __constant_cpu_to_le32 (DMA_ADDR_INVALID);
2954                 td->dmadesc = td->dmaaddr;
2955                 dev->ep [i].dummy = td;
2956         }
2957
2958         /* enable lower-overhead pci memory bursts during DMA */
2959         writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE)
2960                         // 256 write retries may not be enough...
2961                         // | (1 << PCI_RETRY_ABORT_ENABLE)
2962                         | (1 << DMA_READ_MULTIPLE_ENABLE)
2963                         | (1 << DMA_READ_LINE_ENABLE)
2964                         , &dev->pci->pcimstctl);
2965         /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
2966         pci_set_master (pdev);
2967         pci_set_mwi (pdev);
2968
2969         /* ... also flushes any posted pci writes */
2970         dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff;
2971
2972         /* done */
2973         INFO (dev, "%s\n", driver_desc);
2974         INFO (dev, "irq %d, pci mem %p, chip rev %04x\n",
2975                         pdev->irq, base, dev->chiprev);
2976         INFO (dev, "version: " DRIVER_VERSION "; dma %s\n",
2977                         use_dma
2978                                 ? (use_dma_chaining ? "chaining" : "enabled")
2979                                 : "disabled");
2980         the_controller = dev;
2981
2982         retval = device_register (&dev->gadget.dev);
2983         if (retval) goto done;
2984         retval = device_create_file (&pdev->dev, &dev_attr_registers);
2985         if (retval) goto done;
2986
2987         return 0;
2988
2989 done:
2990         if (dev)
2991                 net2280_remove (pdev);
2992         return retval;
2993 }
2994
2995 /* make sure the board is quiescent; otherwise it will continue
2996  * generating IRQs across the upcoming reboot.
2997  */
2998
2999 static void net2280_shutdown (struct pci_dev *pdev)
3000 {
3001         struct net2280          *dev = pci_get_drvdata (pdev);
3002
3003         /* disable IRQs */
3004         writel (0, &dev->regs->pciirqenb0);
3005         writel (0, &dev->regs->pciirqenb1);
3006
3007         /* disable the pullup so the host will think we're gone */
3008         writel (0, &dev->usb->usbctl);
3009 }
3010
3011
3012 /*-------------------------------------------------------------------------*/
3013
3014 static const struct pci_device_id pci_ids [] = { {
3015         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3016         .class_mask =   ~0,
3017         .vendor =       0x17cc,
3018         .device =       0x2280,
3019         .subvendor =    PCI_ANY_ID,
3020         .subdevice =    PCI_ANY_ID,
3021 }, {
3022         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3023         .class_mask =   ~0,
3024         .vendor =       0x17cc,
3025         .device =       0x2282,
3026         .subvendor =    PCI_ANY_ID,
3027         .subdevice =    PCI_ANY_ID,
3028
3029 }, { /* end: all zeroes */ }
3030 };
3031 MODULE_DEVICE_TABLE (pci, pci_ids);
3032
3033 /* pci driver glue; this is a "new style" PCI driver module */
3034 static struct pci_driver net2280_pci_driver = {
3035         .name =         (char *) driver_name,
3036         .id_table =     pci_ids,
3037
3038         .probe =        net2280_probe,
3039         .remove =       net2280_remove,
3040         .shutdown =     net2280_shutdown,
3041
3042         /* FIXME add power management support */
3043 };
3044
3045 MODULE_DESCRIPTION (DRIVER_DESC);
3046 MODULE_AUTHOR ("David Brownell");
3047 MODULE_LICENSE ("GPL");
3048
3049 static int __init init (void)
3050 {
3051         if (!use_dma)
3052                 use_dma_chaining = 0;
3053         return pci_register_driver (&net2280_pci_driver);
3054 }
3055 module_init (init);
3056
3057 static void __exit cleanup (void)
3058 {
3059         pci_unregister_driver (&net2280_pci_driver);
3060 }
3061 module_exit (cleanup);