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[net-next-2.6.git] / drivers / usb / gadget / goku_udc.c
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1da177e4
LT		 1/*
2 * Toshiba TC86C001 ("Goku-S") USB Device Controller driver
3 *
4 * Copyright (C) 2000-2002 Lineo
5 * by Stuart Lynne, Tom Rushworth, and Bruce Balden
6 * Copyright (C) 2002 Toshiba Corporation
7 * Copyright (C) 2003 MontaVista Software (source@mvista.com)
8 *
9 * This file is licensed under the terms of the GNU General Public
10 * License version 2. This program is licensed "as is" without any
11 * warranty of any kind, whether express or implied.
12 */
13
14/*
15 * This device has ep0 and three semi-configurable bulk/interrupt endpoints.
16 *
17 * - Endpoint numbering is fixed: ep{1,2,3}-bulk
18 * - Gadget drivers can choose ep maxpacket (8/16/32/64)
19 * - Gadget drivers can choose direction (IN, OUT)
20 * - DMA works with ep1 (OUT transfers) and ep2 (IN transfers).
21 */
22
23#undef DEBUG
24// #define VERBOSE /* extra debug messages (success too) */
25// #define USB_TRACE /* packet-level success messages */
26
1da177e4
LT		 27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/pci.h>
30#include <linux/delay.h>
31#include <linux/ioport.h>
32#include <linux/sched.h>
33#include <linux/slab.h>
34#include <linux/smp_lock.h>
35#include <linux/errno.h>
36#include <linux/init.h>
37#include <linux/timer.h>
38#include <linux/list.h>
39#include <linux/interrupt.h>
40#include <linux/proc_fs.h>
41#include <linux/device.h>
42#include <linux/usb_ch9.h>
43#include <linux/usb_gadget.h>
44
45#include <asm/byteorder.h>
46#include <asm/io.h>
47#include <asm/irq.h>
48#include <asm/system.h>
49#include <asm/unaligned.h>
50
51
52#include "goku_udc.h"
53
54#define DRIVER_DESC "TC86C001 USB Device Controller"
55#define DRIVER_VERSION "30-Oct 2003"
56
57#define DMA_ADDR_INVALID (~(dma_addr_t)0)
58
59static const char driver_name [] = "goku_udc";
60static const char driver_desc [] = DRIVER_DESC;
61
62MODULE_AUTHOR("source@mvista.com");
63MODULE_DESCRIPTION(DRIVER_DESC);
64MODULE_LICENSE("GPL");
65
66
67/*
68 * IN dma behaves ok under testing, though the IN-dma abort paths don't
69 * seem to behave quite as expected. Used by default.
70 *
71 * OUT dma documents design problems handling the common "short packet"
988199fe 72 * transfer termination policy; it couldn't be enabled by default, even
1da177e4
LT		 73 * if the OUT-dma abort problems had a resolution.
74 */
75static unsigned use_dma = 1;
76
77#if 0
78//#include <linux/moduleparam.h>
79/* "modprobe goku_udc use_dma=1" etc
80 * 0 to disable dma
81 * 1 to use IN dma only (normal operation)
82 * 2 to use IN and OUT dma
83 */
84module_param(use_dma, uint, S_IRUGO);
85#endif
86
87/*-------------------------------------------------------------------------*/
88
89static void nuke(struct goku_ep *, int status);
90
91static inline void
92command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
93{
94 writel(COMMAND_EP(epnum) | command, &regs->Command);
95 udelay(300);
96}
97
98static int
99goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
100{
101 struct goku_udc *dev;
102 struct goku_ep *ep;
103 u32 mode;
104 u16 max;
105 unsigned long flags;
106
107 ep = container_of(_ep, struct goku_ep, ep);
108 if (!_ep || !desc || ep->desc
109 || desc->bDescriptorType != USB_DT_ENDPOINT)
110 return -EINVAL;
111 dev = ep->dev;
112 if (ep == &dev->ep[0])
113 return -EINVAL;
114 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
115 return -ESHUTDOWN;
116 if (ep->num != (desc->bEndpointAddress & 0x0f))
117 return -EINVAL;
118
119 switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
120 case USB_ENDPOINT_XFER_BULK:
121 case USB_ENDPOINT_XFER_INT:
122 break;
123 default:
124 return -EINVAL;
125 }
126
127 if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
128 != EPxSTATUS_EP_INVALID)
129 return -EBUSY;
130
131 /* enabling the no-toggle interrupt mode would need an api hook */
132 mode = 0;
133 max = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
134 switch (max) {
135 case 64: mode++;
136 case 32: mode++;
137 case 16: mode++;
138 case 8: mode <<= 3;
139 break;
140 default:
141 return -EINVAL;
142 }
143 mode |= 2 << 1; /* bulk, or intr-with-toggle */
144
145 /* ep1/ep2 dma direction is chosen early; it works in the other
146 * direction, with pio. be cautious with out-dma.
147 */
148 ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
149 if (ep->is_in) {
150 mode |= 1;
151 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
152 } else {
153 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
154 if (ep->dma)
155 DBG(dev, "%s out-dma hides short packets\n",
156 ep->ep.name);
157 }
158
159 spin_lock_irqsave(&ep->dev->lock, flags);
160
161 /* ep1 and ep2 can do double buffering and/or dma */
162 if (ep->num < 3) {
163 struct goku_udc_regs __iomem *regs = ep->dev->regs;
164 u32 tmp;
165
166 /* double buffer except (for now) with pio in */
167 tmp = ((ep->dma || !ep->is_in)
168 ? 0x10 /* double buffered */
169 : 0x11 /* single buffer */
170 ) << ep->num;
171 tmp |= readl(&regs->EPxSingle);
172 writel(tmp, &regs->EPxSingle);
173
174 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
175 tmp |= readl(&regs->EPxBCS);
176 writel(tmp, &regs->EPxBCS);
177 }
178 writel(mode, ep->reg_mode);
179 command(ep->dev->regs, COMMAND_RESET, ep->num);
180 ep->ep.maxpacket = max;
181 ep->stopped = 0;
182 ep->desc = desc;
183 spin_unlock_irqrestore(&ep->dev->lock, flags);
184
185 DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
186 ep->is_in ? "IN" : "OUT",
187 ep->dma ? "dma" : "pio",
188 max);
189
190 return 0;
191}
192
193static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
194{
195 struct goku_udc *dev = ep->dev;
196
197 if (regs) {
198 command(regs, COMMAND_INVALID, ep->num);
199 if (ep->num) {
200 if (ep->num == UDC_MSTWR_ENDPOINT)
201 dev->int_enable &= ~(INT_MSTWREND
202 |INT_MSTWRTMOUT);
203 else if (ep->num == UDC_MSTRD_ENDPOINT)
204 dev->int_enable &= ~INT_MSTRDEND;
205 dev->int_enable &= ~INT_EPxDATASET (ep->num);
206 } else
207 dev->int_enable &= ~INT_EP0;
208 writel(dev->int_enable, &regs->int_enable);
209 readl(&regs->int_enable);
210 if (ep->num < 3) {
211 struct goku_udc_regs __iomem *r = ep->dev->regs;
212 u32 tmp;
213
214 tmp = readl(&r->EPxSingle);
215 tmp &= ~(0x11 << ep->num);
216 writel(tmp, &r->EPxSingle);
217
218 tmp = readl(&r->EPxBCS);
219 tmp &= ~(0x11 << ep->num);
220 writel(tmp, &r->EPxBCS);
221 }
222 /* reset dma in case we're still using it */
223 if (ep->dma) {
224 u32 master;
225
226 master = readl(&regs->dma_master) & MST_RW_BITS;
227 if (ep->num == UDC_MSTWR_ENDPOINT) {
228 master &= ~MST_W_BITS;
229 master |= MST_WR_RESET;
230 } else {
231 master &= ~MST_R_BITS;
232 master |= MST_RD_RESET;
233 }
234 writel(master, &regs->dma_master);
235 }
236 }
237
238 ep->ep.maxpacket = MAX_FIFO_SIZE;
239 ep->desc = NULL;
240 ep->stopped = 1;
241 ep->irqs = 0;
242 ep->dma = 0;
243}
244
245static int goku_ep_disable(struct usb_ep *_ep)
246{
247 struct goku_ep *ep;
248 struct goku_udc *dev;
249 unsigned long flags;
250
251 ep = container_of(_ep, struct goku_ep, ep);
252 if (!_ep || !ep->desc)
253 return -ENODEV;
254 dev = ep->dev;
255 if (dev->ep0state == EP0_SUSPEND)
256 return -EBUSY;
257
258 VDBG(dev, "disable %s\n", _ep->name);
259
260 spin_lock_irqsave(&dev->lock, flags);
261 nuke(ep, -ESHUTDOWN);
262 ep_reset(dev->regs, ep);
263 spin_unlock_irqrestore(&dev->lock, flags);
264
265 return 0;
266}
267
268/*-------------------------------------------------------------------------*/
269
270static struct usb_request *
55016f10 271goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
1da177e4
LT		 272{
273 struct goku_request *req;
274
275 if (!_ep)
276 return NULL;
7039f422 277 req = kzalloc(sizeof *req, gfp_flags);
1da177e4
LT		 278 if (!req)
279 return NULL;
280
1da177e4
LT		 281 req->req.dma = DMA_ADDR_INVALID;
282 INIT_LIST_HEAD(&req->queue);
283 return &req->req;
284}
285
286static void
287goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
288{
289 struct goku_request *req;
290
291 if (!_ep || !_req)
292 return;
293
294 req = container_of(_req, struct goku_request, req);
295 WARN_ON(!list_empty(&req->queue));
296 kfree(req);
297}
298
299/*-------------------------------------------------------------------------*/
300
301#undef USE_KMALLOC
302
303/* many common platforms have dma-coherent caches, which means that it's
304 * safe to use kmalloc() memory for all i/o buffers without using any
305 * cache flushing calls. (unless you're trying to share cache lines
306 * between dma and non-dma activities, which is a slow idea in any case.)
307 *
308 * other platforms need more care, with 2.6 having a moderately general
309 * solution except for the common "buffer is smaller than a page" case.
310 */
311#if defined(CONFIG_X86)
312#define USE_KMALLOC
313
988199fe 314#elif defined(CONFIG_MIPS) && !defined(CONFIG_DMA_NONCOHERENT)
1da177e4
LT		 315#define USE_KMALLOC
316
317#elif defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
318#define USE_KMALLOC
319
320#endif
321
322/* allocating buffers this way eliminates dma mapping overhead, which
323 * on some platforms will mean eliminating a per-io buffer copy. with
324 * some kinds of system caches, further tweaks may still be needed.
325 */
326static void *
327goku_alloc_buffer(struct usb_ep *_ep, unsigned bytes,
55016f10 328 dma_addr_t *dma, gfp_t gfp_flags)
1da177e4
LT		 329{
330 void *retval;
331 struct goku_ep *ep;
332
333 ep = container_of(_ep, struct goku_ep, ep);
334 if (!_ep)
335 return NULL;
336 *dma = DMA_ADDR_INVALID;
337
338#if defined(USE_KMALLOC)
339 retval = kmalloc(bytes, gfp_flags);
340 if (retval)
341 *dma = virt_to_phys(retval);
342#else
343 if (ep->dma) {
344 /* the main problem with this call is that it wastes memory
345 * on typical 1/N page allocations: it allocates 1-N pages.
346 */
347#warning Using dma_alloc_coherent even with buffers smaller than a page.
348 retval = dma_alloc_coherent(&ep->dev->pdev->dev,
349 bytes, dma, gfp_flags);
350 } else
351 retval = kmalloc(bytes, gfp_flags);
352#endif
353 return retval;
354}
355
356static void
357goku_free_buffer(struct usb_ep *_ep, void *buf, dma_addr_t dma, unsigned bytes)
358{
359 /* free memory into the right allocator */
360#ifndef USE_KMALLOC
361 if (dma != DMA_ADDR_INVALID) {
362 struct goku_ep *ep;
363
364 ep = container_of(_ep, struct goku_ep, ep);
365 if (!_ep)
366 return;
367 dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma);
368 } else
369#endif
370 kfree (buf);
371}
372
373/*-------------------------------------------------------------------------*/
374
375static void
376done(struct goku_ep *ep, struct goku_request *req, int status)
377{
378 struct goku_udc *dev;
379 unsigned stopped = ep->stopped;
380
381 list_del_init(&req->queue);
382
383 if (likely(req->req.status == -EINPROGRESS))
384 req->req.status = status;
385 else
386 status = req->req.status;
387
388 dev = ep->dev;
389 if (req->mapped) {
390 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
391 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
392 req->req.dma = DMA_ADDR_INVALID;
393 req->mapped = 0;
394 }
395
396#ifndef USB_TRACE
397 if (status && status != -ESHUTDOWN)
398#endif
399 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
400 ep->ep.name, &req->req, status,
401 req->req.actual, req->req.length);
402
403 /* don't modify queue heads during completion callback */
404 ep->stopped = 1;
405 spin_unlock(&dev->lock);
406 req->req.complete(&ep->ep, &req->req);
407 spin_lock(&dev->lock);
408 ep->stopped = stopped;
409}
410
411/*-------------------------------------------------------------------------*/
412
413static inline int
414write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
415{
416 unsigned length, count;
417
418 length = min(req->req.length - req->req.actual, max);
419 req->req.actual += length;
420
421 count = length;
422 while (likely(count--))
423 writel(*buf++, fifo);
424 return length;
425}
426
427// return: 0 = still running, 1 = completed, negative = errno
428static int write_fifo(struct goku_ep *ep, struct goku_request *req)
429{
430 struct goku_udc *dev = ep->dev;
431 u32 tmp;
432 u8 *buf;
433 unsigned count;
434 int is_last;
435
436 tmp = readl(&dev->regs->DataSet);
437 buf = req->req.buf + req->req.actual;
438 prefetch(buf);
439
440 dev = ep->dev;
441 if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
442 return -EL2HLT;
443
444 /* NOTE: just single-buffered PIO-IN for now. */
445 if (unlikely((tmp & DATASET_A(ep->num)) != 0))
446 return 0;
447
448 /* clear our "packet available" irq */
449 if (ep->num != 0)
450 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
451
452 count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
453
454 /* last packet often short (sometimes a zlp, especially on ep0) */
455 if (unlikely(count != ep->ep.maxpacket)) {
456 writel(~(1<<ep->num), &dev->regs->EOP);
457 if (ep->num == 0) {
458 dev->ep[0].stopped = 1;
459 dev->ep0state = EP0_STATUS;
460 }
461 is_last = 1;
462 } else {
463 if (likely(req->req.length != req->req.actual)
464 || req->req.zero)
465 is_last = 0;
466 else
467 is_last = 1;
468 }
469#if 0 /* printk seemed to trash is_last...*/
470//#ifdef USB_TRACE
471 VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
472 ep->ep.name, count, is_last ? "/last" : "",
473 req->req.length - req->req.actual, req);
474#endif
475
476 /* requests complete when all IN data is in the FIFO,
477 * or sometimes later, if a zlp was needed.
478 */
479 if (is_last) {
480 done(ep, req, 0);
481 return 1;
482 }
483
484 return 0;
485}
486
487static int read_fifo(struct goku_ep *ep, struct goku_request *req)
488{
489 struct goku_udc_regs __iomem *regs;
490 u32 size, set;
491 u8 *buf;
492 unsigned bufferspace, is_short, dbuff;
493
494 regs = ep->dev->regs;
495top:
496 buf = req->req.buf + req->req.actual;
497 prefetchw(buf);
498
499 if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
500 return -EL2HLT;
501
502 dbuff = (ep->num == 1 || ep->num == 2);
503 do {
504 /* ack dataset irq matching the status we'll handle */
505 if (ep->num != 0)
506 writel(~INT_EPxDATASET(ep->num), &regs->int_status);
507
508 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
509 size = readl(&regs->EPxSizeLA[ep->num]);
510 bufferspace = req->req.length - req->req.actual;
511
512 /* usually do nothing without an OUT packet */
513 if (likely(ep->num != 0 || bufferspace != 0)) {
514 if (unlikely(set == 0))
515 break;
516 /* use ep1/ep2 double-buffering for OUT */
517 if (!(size & PACKET_ACTIVE))
518 size = readl(&regs->EPxSizeLB[ep->num]);
519 if (!(size & PACKET_ACTIVE)) // "can't happen"
520 break;
521 size &= DATASIZE; /* EPxSizeH == 0 */
522
523 /* ep0out no-out-data case for set_config, etc */
524 } else
525 size = 0;
526
527 /* read all bytes from this packet */
528 req->req.actual += size;
529 is_short = (size < ep->ep.maxpacket);
530#ifdef USB_TRACE
531 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
532 ep->ep.name, size, is_short ? "/S" : "",
533 req, req->req.actual, req->req.length);
534#endif
535 while (likely(size-- != 0)) {
536 u8 byte = (u8) readl(ep->reg_fifo);
537
538 if (unlikely(bufferspace == 0)) {
539 /* this happens when the driver's buffer
540 * is smaller than what the host sent.
541 * discard the extra data in this packet.
542 */
543 if (req->req.status != -EOVERFLOW)
544 DBG(ep->dev, "%s overflow %u\n",
545 ep->ep.name, size);
546 req->req.status = -EOVERFLOW;
547 } else {
548 *buf++ = byte;
549 bufferspace--;
550 }
551 }
552
553 /* completion */
554 if (unlikely(is_short || req->req.actual == req->req.length)) {
555 if (unlikely(ep->num == 0)) {
556 /* non-control endpoints now usable? */
557 if (ep->dev->req_config)
558 writel(ep->dev->configured
559 ? USBSTATE_CONFIGURED
560 : 0,
561 &regs->UsbState);
562 /* ep0out status stage */
563 writel(~(1<<0), &regs->EOP);
564 ep->stopped = 1;
565 ep->dev->ep0state = EP0_STATUS;
566 }
567 done(ep, req, 0);
568
569 /* empty the second buffer asap */
570 if (dbuff && !list_empty(&ep->queue)) {
571 req = list_entry(ep->queue.next,
572 struct goku_request, queue);
573 goto top;
574 }
575 return 1;
576 }
577 } while (dbuff);
578 return 0;
579}
580
581static inline void
582pio_irq_enable(struct goku_udc *dev,
583 struct goku_udc_regs __iomem *regs, int epnum)
584{
585 dev->int_enable |= INT_EPxDATASET (epnum);
586 writel(dev->int_enable, &regs->int_enable);
587 /* write may still be posted */
588}
589
590static inline void
591pio_irq_disable(struct goku_udc *dev,
592 struct goku_udc_regs __iomem *regs, int epnum)
593{
594 dev->int_enable &= ~INT_EPxDATASET (epnum);
595 writel(dev->int_enable, &regs->int_enable);
596 /* write may still be posted */
597}
598
599static inline void
600pio_advance(struct goku_ep *ep)
601{
602 struct goku_request *req;
603
604 if (unlikely(list_empty (&ep->queue)))
605 return;
606 req = list_entry(ep->queue.next, struct goku_request, queue);
607 (ep->is_in ? write_fifo : read_fifo)(ep, req);
608}
609
610
611/*-------------------------------------------------------------------------*/
612
613// return: 0 = q running, 1 = q stopped, negative = errno
614static int start_dma(struct goku_ep *ep, struct goku_request *req)
615{
616 struct goku_udc_regs __iomem *regs = ep->dev->regs;
617 u32 master;
618 u32 start = req->req.dma;
619 u32 end = start + req->req.length - 1;
620
621 master = readl(&regs->dma_master) & MST_RW_BITS;
622
623 /* re-init the bits affecting IN dma; careful with zlps */
624 if (likely(ep->is_in)) {
625 if (unlikely(master & MST_RD_ENA)) {
626 DBG (ep->dev, "start, IN active dma %03x!!\n",
627 master);
628// return -EL2HLT;
629 }
630 writel(end, &regs->in_dma_end);
631 writel(start, &regs->in_dma_start);
632
633 master &= ~MST_R_BITS;
634 if (unlikely(req->req.length == 0))
635 master = MST_RD_ENA | MST_RD_EOPB;
636 else if ((req->req.length % ep->ep.maxpacket) != 0
637 || req->req.zero)
638 master = MST_RD_ENA | MST_EOPB_ENA;
639 else
640 master = MST_RD_ENA | MST_EOPB_DIS;
641
642 ep->dev->int_enable |= INT_MSTRDEND;
643
644 /* Goku DMA-OUT merges short packets, which plays poorly with
645 * protocols where short packets mark the transfer boundaries.
646 * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
647 * ending transfers after 3 SOFs; we don't turn it on.
648 */
649 } else {
650 if (unlikely(master & MST_WR_ENA)) {
651 DBG (ep->dev, "start, OUT active dma %03x!!\n",
652 master);
653// return -EL2HLT;
654 }
655 writel(end, &regs->out_dma_end);
656 writel(start, &regs->out_dma_start);
657
658 master &= ~MST_W_BITS;
659 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
660
661 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
662 }
663
664 writel(master, &regs->dma_master);
665 writel(ep->dev->int_enable, &regs->int_enable);
666 return 0;
667}
668
669static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
670{
671 struct goku_request *req;
672 struct goku_udc_regs __iomem *regs = ep->dev->regs;
673 u32 master;
674
675 master = readl(&regs->dma_master);
676
677 if (unlikely(list_empty(&ep->queue))) {
678stop:
679 if (ep->is_in)
680 dev->int_enable &= ~INT_MSTRDEND;
681 else
682 dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
683 writel(dev->int_enable, &regs->int_enable);
684 return;
685 }
686 req = list_entry(ep->queue.next, struct goku_request, queue);
687
688 /* normal hw dma completion (not abort) */
689 if (likely(ep->is_in)) {
690 if (unlikely(master & MST_RD_ENA))
691 return;
692 req->req.actual = readl(&regs->in_dma_current);
693 } else {
694 if (unlikely(master & MST_WR_ENA))
695 return;
696
697 /* hardware merges short packets, and also hides packet
698 * overruns. a partial packet MAY be in the fifo here.
699 */
700 req->req.actual = readl(&regs->out_dma_current);
701 }
702 req->req.actual -= req->req.dma;
703 req->req.actual++;
704
705#ifdef USB_TRACE
706 VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
707 ep->ep.name, ep->is_in ? "IN" : "OUT",
708 req->req.actual, req->req.length, req);
709#endif
710 done(ep, req, 0);
711 if (list_empty(&ep->queue))
712 goto stop;
713 req = list_entry(ep->queue.next, struct goku_request, queue);
714 (void) start_dma(ep, req);
715}
716
717static void abort_dma(struct goku_ep *ep, int status)
718{
719 struct goku_udc_regs __iomem *regs = ep->dev->regs;
720 struct goku_request *req;
721 u32 curr, master;
722
723 /* NAK future host requests, hoping the implicit delay lets the
724 * dma engine finish reading (or writing) its latest packet and
725 * empty the dma buffer (up to 16 bytes).
726 *
727 * This avoids needing to clean up a partial packet in the fifo;
728 * we can't do that for IN without side effects to HALT and TOGGLE.
729 */
730 command(regs, COMMAND_FIFO_DISABLE, ep->num);
731 req = list_entry(ep->queue.next, struct goku_request, queue);
732 master = readl(&regs->dma_master) & MST_RW_BITS;
733
734 /* FIXME using these resets isn't usably documented. this may
735 * not work unless it's followed by disabling the endpoint.
736 *
737 * FIXME the OUT reset path doesn't even behave consistently.
738 */
739 if (ep->is_in) {
740 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
741 goto finished;
742 curr = readl(&regs->in_dma_current);
743
744 writel(curr, &regs->in_dma_end);
745 writel(curr, &regs->in_dma_start);
746
747 master &= ~MST_R_BITS;
748 master |= MST_RD_RESET;
749 writel(master, &regs->dma_master);
750
751 if (readl(&regs->dma_master) & MST_RD_ENA)
752 DBG(ep->dev, "IN dma active after reset!\n");
753
754 } else {
755 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
756 goto finished;
757 curr = readl(&regs->out_dma_current);
758
759 writel(curr, &regs->out_dma_end);
760 writel(curr, &regs->out_dma_start);
761
762 master &= ~MST_W_BITS;
763 master |= MST_WR_RESET;
764 writel(master, &regs->dma_master);
765
766 if (readl(&regs->dma_master) & MST_WR_ENA)
767 DBG(ep->dev, "OUT dma active after reset!\n");
768 }
769 req->req.actual = (curr - req->req.dma) + 1;
770 req->req.status = status;
771
772 VDBG(ep->dev, "%s %s %s %d/%d\n", __FUNCTION__, ep->ep.name,
773 ep->is_in ? "IN" : "OUT",
774 req->req.actual, req->req.length);
775
776 command(regs, COMMAND_FIFO_ENABLE, ep->num);
777
778 return;
779
780finished:
781 /* dma already completed; no abort needed */
782 command(regs, COMMAND_FIFO_ENABLE, ep->num);
783 req->req.actual = req->req.length;
784 req->req.status = 0;
785}
786
787/*-------------------------------------------------------------------------*/
788
789static int
55016f10 790goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
1da177e4
LT		 791{
792 struct goku_request *req;
793 struct goku_ep *ep;
794 struct goku_udc *dev;
795 unsigned long flags;
796 int status;
797
798 /* always require a cpu-view buffer so pio works */
799 req = container_of(_req, struct goku_request, req);
800 if (unlikely(!_req || !_req->complete
801 || !_req->buf || !list_empty(&req->queue)))
802 return -EINVAL;
803 ep = container_of(_ep, struct goku_ep, ep);
804 if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
805 return -EINVAL;
806 dev = ep->dev;
807 if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
808 return -ESHUTDOWN;
809
810 /* can't touch registers when suspended */
811 if (dev->ep0state == EP0_SUSPEND)
812 return -EBUSY;
813
814 /* set up dma mapping in case the caller didn't */
815 if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
816 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
817 ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
818 req->mapped = 1;
819 }
820
821#ifdef USB_TRACE
822 VDBG(dev, "%s queue req %p, len %u buf %p\n",
823 _ep->name, _req, _req->length, _req->buf);
824#endif
825
826 spin_lock_irqsave(&dev->lock, flags);
827
828 _req->status = -EINPROGRESS;
829 _req->actual = 0;
830
831 /* for ep0 IN without premature status, zlp is required and
832 * writing EOP starts the status stage (OUT).
833 */
834 if (unlikely(ep->num == 0 && ep->is_in))
835 _req->zero = 1;
836
837 /* kickstart this i/o queue? */
838 status = 0;
839 if (list_empty(&ep->queue) && likely(!ep->stopped)) {
840 /* dma: done after dma completion IRQ (or error)
841 * pio: done after last fifo operation
842 */
843 if (ep->dma)
844 status = start_dma(ep, req);
845 else
846 status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
847
848 if (unlikely(status != 0)) {
849 if (status > 0)
850 status = 0;
851 req = NULL;
852 }
853
854 } /* else pio or dma irq handler advances the queue. */
855
856 if (likely(req != 0))
857 list_add_tail(&req->queue, &ep->queue);
858
859 if (likely(!list_empty(&ep->queue))
860 && likely(ep->num != 0)
861 && !ep->dma
862 && !(dev->int_enable & INT_EPxDATASET (ep->num)))
863 pio_irq_enable(dev, dev->regs, ep->num);
864
865 spin_unlock_irqrestore(&dev->lock, flags);
866
867 /* pci writes may still be posted */
868 return status;
869}
870
871/* dequeue ALL requests */
872static void nuke(struct goku_ep *ep, int status)
873{
874 struct goku_request *req;
875
876 ep->stopped = 1;
877 if (list_empty(&ep->queue))
878 return;
879 if (ep->dma)
880 abort_dma(ep, status);
881 while (!list_empty(&ep->queue)) {
882 req = list_entry(ep->queue.next, struct goku_request, queue);
883 done(ep, req, status);
884 }
885}
886
887/* dequeue JUST ONE request */
888static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
889{
890 struct goku_request *req;
891 struct goku_ep *ep;
892 struct goku_udc *dev;
893 unsigned long flags;
894
895 ep = container_of(_ep, struct goku_ep, ep);
896 if (!_ep || !_req || (!ep->desc && ep->num != 0))
897 return -EINVAL;
898 dev = ep->dev;
899 if (!dev->driver)
900 return -ESHUTDOWN;
901
902 /* we can't touch (dma) registers when suspended */
903 if (dev->ep0state == EP0_SUSPEND)
904 return -EBUSY;
905
906 VDBG(dev, "%s %s %s %s %p\n", __FUNCTION__, _ep->name,
907 ep->is_in ? "IN" : "OUT",
908 ep->dma ? "dma" : "pio",
909 _req);
910
911 spin_lock_irqsave(&dev->lock, flags);
912
913 /* make sure it's actually queued on this endpoint */
914 list_for_each_entry (req, &ep->queue, queue) {
915 if (&req->req == _req)
916 break;
917 }
918 if (&req->req != _req) {
919 spin_unlock_irqrestore (&dev->lock, flags);
920 return -EINVAL;
921 }
922
923 if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
924 abort_dma(ep, -ECONNRESET);
925 done(ep, req, -ECONNRESET);
926 dma_advance(dev, ep);
927 } else if (!list_empty(&req->queue))
928 done(ep, req, -ECONNRESET);
929 else
930 req = NULL;
931 spin_unlock_irqrestore(&dev->lock, flags);
932
933 return req ? 0 : -EOPNOTSUPP;
934}
935
936/*-------------------------------------------------------------------------*/
937
938static void goku_clear_halt(struct goku_ep *ep)
939{
940 // assert (ep->num !=0)
941 VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
942 command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
943 command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
944 if (ep->stopped) {
945 ep->stopped = 0;
946 if (ep->dma) {
947 struct goku_request *req;
948
949 if (list_empty(&ep->queue))
950 return;
951 req = list_entry(ep->queue.next, struct goku_request,
952 queue);
953 (void) start_dma(ep, req);
954 } else
955 pio_advance(ep);
956 }
957}
958
959static int goku_set_halt(struct usb_ep *_ep, int value)
960{
961 struct goku_ep *ep;
962 unsigned long flags;
963 int retval = 0;
964
965 if (!_ep)
966 return -ENODEV;
967 ep = container_of (_ep, struct goku_ep, ep);
968
969 if (ep->num == 0) {
970 if (value) {
971 ep->dev->ep0state = EP0_STALL;
972 ep->dev->ep[0].stopped = 1;
973 } else
974 return -EINVAL;
975
976 /* don't change EPxSTATUS_EP_INVALID to READY */
977 } else if (!ep->desc) {
978 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
979 return -EINVAL;
980 }
981
982 spin_lock_irqsave(&ep->dev->lock, flags);
983 if (!list_empty(&ep->queue))
984 retval = -EAGAIN;
985 else if (ep->is_in && value
986 /* data in (either) packet buffer? */
987 && (readl(&ep->dev->regs->DataSet)
988 & DATASET_AB(ep->num)))
989 retval = -EAGAIN;
990 else if (!value)
991 goku_clear_halt(ep);
992 else {
993 ep->stopped = 1;
994 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
995 command(ep->dev->regs, COMMAND_STALL, ep->num);
996 readl(ep->reg_status);
997 }
998 spin_unlock_irqrestore(&ep->dev->lock, flags);
999 return retval;
1000}
1001
1002static int goku_fifo_status(struct usb_ep *_ep)
1003{
1004 struct goku_ep *ep;
1005 struct goku_udc_regs __iomem *regs;
1006 u32 size;
1007
1008 if (!_ep)
1009 return -ENODEV;
1010 ep = container_of(_ep, struct goku_ep, ep);
1011
1012 /* size is only reported sanely for OUT */
1013 if (ep->is_in)
1014 return -EOPNOTSUPP;
1015
1016 /* ignores 16-byte dma buffer; SizeH == 0 */
1017 regs = ep->dev->regs;
1018 size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
1019 size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
1020 VDBG(ep->dev, "%s %s %u\n", __FUNCTION__, ep->ep.name, size);
1021 return size;
1022}
1023
1024static void goku_fifo_flush(struct usb_ep *_ep)
1025{
1026 struct goku_ep *ep;
1027 struct goku_udc_regs __iomem *regs;
1028 u32 size;
1029
1030 if (!_ep)
1031 return;
1032 ep = container_of(_ep, struct goku_ep, ep);
1033 VDBG(ep->dev, "%s %s\n", __FUNCTION__, ep->ep.name);
1034
1035 /* don't change EPxSTATUS_EP_INVALID to READY */
1036 if (!ep->desc && ep->num != 0) {
1037 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
1038 return;
1039 }
1040
1041 regs = ep->dev->regs;
1042 size = readl(&regs->EPxSizeLA[ep->num]);
1043 size &= DATASIZE;
1044
1045 /* Non-desirable behavior: FIFO_CLEAR also clears the
1046 * endpoint halt feature. For OUT, we _could_ just read
1047 * the bytes out (PIO, if !ep->dma); for in, no choice.
1048 */
1049 if (size)
1050 command(regs, COMMAND_FIFO_CLEAR, ep->num);
1051}
1052
1053static struct usb_ep_ops goku_ep_ops = {
1054 .enable = goku_ep_enable,
1055 .disable = goku_ep_disable,
1056
1057 .alloc_request = goku_alloc_request,
1058 .free_request = goku_free_request,
1059
1060 .alloc_buffer = goku_alloc_buffer,
1061 .free_buffer = goku_free_buffer,
1062
1063 .queue = goku_queue,
1064 .dequeue = goku_dequeue,
1065
1066 .set_halt = goku_set_halt,
1067 .fifo_status = goku_fifo_status,
1068 .fifo_flush = goku_fifo_flush,
1069};
1070
1071/*-------------------------------------------------------------------------*/
1072
1073static int goku_get_frame(struct usb_gadget *_gadget)
1074{
1075 return -EOPNOTSUPP;
1076}
1077
1078static const struct usb_gadget_ops goku_ops = {
1079 .get_frame = goku_get_frame,
1080 // no remote wakeup
1081 // not selfpowered
1082};
1083
1084/*-------------------------------------------------------------------------*/
1085
1086static inline char *dmastr(void)
1087{
1088 if (use_dma == 0)
1089 return "(dma disabled)";
1090 else if (use_dma == 2)
1091 return "(dma IN and OUT)";
1092 else
1093 return "(dma IN)";
1094}
1095
1096#ifdef CONFIG_USB_GADGET_DEBUG_FILES
1097
1098static const char proc_node_name [] = "driver/udc";
1099
1100#define FOURBITS "%s%s%s%s"
1101#define EIGHTBITS FOURBITS FOURBITS
1102
1103static void
1104dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1105{
1106 int t;
1107
1108 /* int_status is the same format ... */
1109 t = scnprintf(*next, *size,
1110 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1111 label, mask,
1112 (mask & INT_PWRDETECT) ? " power" : "",
1113 (mask & INT_SYSERROR) ? " sys" : "",
1114 (mask & INT_MSTRDEND) ? " in-dma" : "",
1115 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1116
1117 (mask & INT_MSTWREND) ? " out-dma" : "",
1118 (mask & INT_MSTWRSET) ? " wrset" : "",
1119 (mask & INT_ERR) ? " err" : "",
1120 (mask & INT_SOF) ? " sof" : "",
1121
1122 (mask & INT_EP3NAK) ? " ep3nak" : "",
1123 (mask & INT_EP2NAK) ? " ep2nak" : "",
1124 (mask & INT_EP1NAK) ? " ep1nak" : "",
1125 (mask & INT_EP3DATASET) ? " ep3" : "",
1126
1127 (mask & INT_EP2DATASET) ? " ep2" : "",
1128 (mask & INT_EP1DATASET) ? " ep1" : "",
1129 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1130 (mask & INT_STATUS) ? " ep0status" : "",
1131
1132 (mask & INT_SETUP) ? " setup" : "",
1133 (mask & INT_ENDPOINT0) ? " ep0" : "",
1134 (mask & INT_USBRESET) ? " reset" : "",
1135 (mask & INT_SUSPEND) ? " suspend" : "");
1136 *size -= t;
1137 *next += t;
1138}
1139
1140
1141static int
1142udc_proc_read(char *buffer, char **start, off_t off, int count,
1143 int *eof, void *_dev)
1144{
1145 char *buf = buffer;
1146 struct goku_udc *dev = _dev;
1147 struct goku_udc_regs __iomem *regs = dev->regs;
1148 char *next = buf;
1149 unsigned size = count;
1150 unsigned long flags;
1151 int i, t, is_usb_connected;
1152 u32 tmp;
1153
1154 if (off != 0)
1155 return 0;
1156
1157 local_irq_save(flags);
1158
1159 /* basic device status */
1160 tmp = readl(&regs->power_detect);
1161 is_usb_connected = tmp & PW_DETECT;
1162 t = scnprintf(next, size,
1163 "%s - %s\n"
1164 "%s version: %s %s\n"
1165 "Gadget driver: %s\n"
1166 "Host %s, %s\n"
1167 "\n",
1168 pci_name(dev->pdev), driver_desc,
1169 driver_name, DRIVER_VERSION, dmastr(),
1170 dev->driver ? dev->driver->driver.name : "(none)",
1171 is_usb_connected
1172 ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1173 : "disconnected",
1174 ({char *tmp;
1175 switch(dev->ep0state){
1176 case EP0_DISCONNECT: tmp = "ep0_disconnect"; break;
1177 case EP0_IDLE: tmp = "ep0_idle"; break;
1178 case EP0_IN: tmp = "ep0_in"; break;
1179 case EP0_OUT: tmp = "ep0_out"; break;
1180 case EP0_STATUS: tmp = "ep0_status"; break;
1181 case EP0_STALL: tmp = "ep0_stall"; break;
1182 case EP0_SUSPEND: tmp = "ep0_suspend"; break;
1183 default: tmp = "ep0_?"; break;
1184 } tmp; })
1185 );
1186 size -= t;
1187 next += t;
1188
1189 dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1190 dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1191
1192 if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1193 goto done;
1194
1195 /* registers for (active) device and ep0 */
1196 t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1197 "single.bcs %02x.%02x state %x addr %u\n",
1198 dev->irqs, readl(&regs->DataSet),
1199 readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1200 readl(&regs->UsbState),
1201 readl(&regs->address));
1202 size -= t;
1203 next += t;
1204
1205 tmp = readl(&regs->dma_master);
1206 t = scnprintf(next, size,
1207 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1208 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1209 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1210 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1211 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1212
1213 (tmp & MST_RD_EOPB) ? " eopb" : "",
1214 (tmp & MST_RD_RESET) ? " in_reset" : "",
1215 (tmp & MST_WR_RESET) ? " out_reset" : "",
1216 (tmp & MST_RD_ENA) ? " IN" : "",
1217
1218 (tmp & MST_WR_ENA) ? " OUT" : "",
1219 (tmp & MST_CONNECTION)
1220 ? "ep1in/ep2out"
1221 : "ep1out/ep2in");
1222 size -= t;
1223 next += t;
1224
1225 /* dump endpoint queues */
1226 for (i = 0; i < 4; i++) {
1227 struct goku_ep *ep = &dev->ep [i];
1228 struct goku_request *req;
1229 int t;
1230
1231 if (i && !ep->desc)
1232 continue;
1233
1234 tmp = readl(ep->reg_status);
1235 t = scnprintf(next, size,
1236 "%s %s max %u %s, irqs %lu, "
1237 "status %02x (%s) " FOURBITS "\n",
1238 ep->ep.name,
1239 ep->is_in ? "in" : "out",
1240 ep->ep.maxpacket,
1241 ep->dma ? "dma" : "pio",
1242 ep->irqs,
1243 tmp, ({ char *s;
1244 switch (tmp & EPxSTATUS_EP_MASK) {
1245 case EPxSTATUS_EP_READY:
1246 s = "ready"; break;
1247 case EPxSTATUS_EP_DATAIN:
1248 s = "packet"; break;
1249 case EPxSTATUS_EP_FULL:
1250 s = "full"; break;
1251 case EPxSTATUS_EP_TX_ERR: // host will retry
1252 s = "tx_err"; break;
1253 case EPxSTATUS_EP_RX_ERR:
1254 s = "rx_err"; break;
1255 case EPxSTATUS_EP_BUSY: /* ep0 only */
1256 s = "busy"; break;
1257 case EPxSTATUS_EP_STALL:
1258 s = "stall"; break;
1259 case EPxSTATUS_EP_INVALID: // these "can't happen"
1260 s = "invalid"; break;
1261 default:
1262 s = "?"; break;
1263 }; s; }),
1264 (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1265 (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1266 (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1267 (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1268 );
1269 if (t <= 0 || t > size)
1270 goto done;
1271 size -= t;
1272 next += t;
1273
1274 if (list_empty(&ep->queue)) {
1275 t = scnprintf(next, size, "\t(nothing queued)\n");
1276 if (t <= 0 || t > size)
1277 goto done;
1278 size -= t;
1279 next += t;
1280 continue;
1281 }
1282 list_for_each_entry(req, &ep->queue, queue) {
1283 if (ep->dma && req->queue.prev == &ep->queue) {
1284 if (i == UDC_MSTRD_ENDPOINT)
1285 tmp = readl(&regs->in_dma_current);
1286 else
1287 tmp = readl(&regs->out_dma_current);
1288 tmp -= req->req.dma;
1289 tmp++;
1290 } else
1291 tmp = req->req.actual;
1292
1293 t = scnprintf(next, size,
1294 "\treq %p len %u/%u buf %p\n",
1295 &req->req, tmp, req->req.length,
1296 req->req.buf);
1297 if (t <= 0 || t > size)
1298 goto done;
1299 size -= t;
1300 next += t;
1301 }
1302 }
1303
1304done:
1305 local_irq_restore(flags);
1306 *eof = 1;
1307 return count - size;
1308}
1309
1310#endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1311
1312/*-------------------------------------------------------------------------*/
1313
1314static void udc_reinit (struct goku_udc *dev)
1315{
1316 static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1317
1318 unsigned i;
1319
1320 INIT_LIST_HEAD (&dev->gadget.ep_list);
1321 dev->gadget.ep0 = &dev->ep [0].ep;
1322 dev->gadget.speed = USB_SPEED_UNKNOWN;
1323 dev->ep0state = EP0_DISCONNECT;
1324 dev->irqs = 0;
1325
1326 for (i = 0; i < 4; i++) {
1327 struct goku_ep *ep = &dev->ep[i];
1328
1329 ep->num = i;
1330 ep->ep.name = names[i];
1331 ep->reg_fifo = &dev->regs->ep_fifo [i];
1332 ep->reg_status = &dev->regs->ep_status [i];
1333 ep->reg_mode = &dev->regs->ep_mode[i];
1334
1335 ep->ep.ops = &goku_ep_ops;
1336 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1337 ep->dev = dev;
1338 INIT_LIST_HEAD (&ep->queue);
1339
1340 ep_reset(NULL, ep);
1341 }
1342
1343 dev->ep[0].reg_mode = NULL;
1344 dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1345 list_del_init (&dev->ep[0].ep.ep_list);
1346}
1347
1348static void udc_reset(struct goku_udc *dev)
1349{
1350 struct goku_udc_regs __iomem *regs = dev->regs;
1351
1352 writel(0, &regs->power_detect);
1353 writel(0, &regs->int_enable);
1354 readl(&regs->int_enable);
1355 dev->int_enable = 0;
1356
1357 /* deassert reset, leave USB D+ at hi-Z (no pullup)
1358 * don't let INT_PWRDETECT sequence begin
1359 */
1360 udelay(250);
1361 writel(PW_RESETB, &regs->power_detect);
1362 readl(&regs->int_enable);
1363}
1364
1365static void ep0_start(struct goku_udc *dev)
1366{
1367 struct goku_udc_regs __iomem *regs = dev->regs;
1368 unsigned i;
1369
1370 VDBG(dev, "%s\n", __FUNCTION__);
1371
1372 udc_reset(dev);
1373 udc_reinit (dev);
1374 //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1375
1376 /* hw handles set_address, set_feature, get_status; maybe more */
1377 writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1378 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1379 | G_REQMODE_GET_DESC
1380 | G_REQMODE_CLEAR_FEAT
1381 , &regs->reqmode);
1382
1383 for (i = 0; i < 4; i++)
1384 dev->ep[i].irqs = 0;
1385
1386 /* can't modify descriptors after writing UsbReady */
1387 for (i = 0; i < DESC_LEN; i++)
1388 writel(0, &regs->descriptors[i]);
1389 writel(0, &regs->UsbReady);
1390
1391 /* expect ep0 requests when the host drops reset */
1392 writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1393 dev->int_enable = INT_DEVWIDE | INT_EP0;
1394 writel(dev->int_enable, &dev->regs->int_enable);
1395 readl(&regs->int_enable);
1396 dev->gadget.speed = USB_SPEED_FULL;
1397 dev->ep0state = EP0_IDLE;
1398}
1399
1400static void udc_enable(struct goku_udc *dev)
1401{
1402 /* start enumeration now, or after power detect irq */
1403 if (readl(&dev->regs->power_detect) & PW_DETECT)
1404 ep0_start(dev);
1405 else {
1406 DBG(dev, "%s\n", __FUNCTION__);
1407 dev->int_enable = INT_PWRDETECT;
1408 writel(dev->int_enable, &dev->regs->int_enable);
1409 }
1410}
1411
1412/*-------------------------------------------------------------------------*/
1413
1414/* keeping it simple:
1415 * - one bus driver, initted first;
1416 * - one function driver, initted second
1417 */
1418
1419static struct goku_udc *the_controller;
1420
1421/* when a driver is successfully registered, it will receive
1422 * control requests including set_configuration(), which enables
1423 * non-control requests. then usb traffic follows until a
1424 * disconnect is reported. then a host may connect again, or
1425 * the driver might get unbound.
1426 */
1427int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1428{
1429 struct goku_udc *dev = the_controller;
1430 int retval;
1431
1432 if (!driver
1433 || driver->speed != USB_SPEED_FULL
1434 || !driver->bind
1435 || !driver->unbind
1436 || !driver->disconnect
1437 || !driver->setup)
1438 return -EINVAL;
1439 if (!dev)
1440 return -ENODEV;
1441 if (dev->driver)
1442 return -EBUSY;
1443
1444 /* hook up the driver */
1445 driver->driver.bus = NULL;
1446 dev->driver = driver;
1447 dev->gadget.dev.driver = &driver->driver;
1448 retval = driver->bind(&dev->gadget);
1449 if (retval) {
1450 DBG(dev, "bind to driver %s --> error %d\n",
1451 driver->driver.name, retval);
1452 dev->driver = NULL;
1453 dev->gadget.dev.driver = NULL;
1454 return retval;
1455 }
1456
1457 /* then enable host detection and ep0; and we're ready
1458 * for set_configuration as well as eventual disconnect.
1459 */
1460 udc_enable(dev);
1461
1462 DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1463 return 0;
1464}
1465EXPORT_SYMBOL(usb_gadget_register_driver);
1466
1467static void
1468stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1469{
1470 unsigned i;
1471
1472 DBG (dev, "%s\n", __FUNCTION__);
1473
1474 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1475 driver = NULL;
1476
1477 /* disconnect gadget driver after quiesceing hw and the driver */
1478 udc_reset (dev);
1479 for (i = 0; i < 4; i++)
1480 nuke(&dev->ep [i], -ESHUTDOWN);
1481 if (driver) {
1482 spin_unlock(&dev->lock);
1483 driver->disconnect(&dev->gadget);
1484 spin_lock(&dev->lock);
1485 }
1486
1487 if (dev->driver)
1488 udc_enable(dev);
1489}
1490
1491int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1492{
1493 struct goku_udc *dev = the_controller;
1494 unsigned long flags;
1495
1496 if (!dev)
1497 return -ENODEV;
1498 if (!driver || driver != dev->driver)
1499 return -EINVAL;
1500
1501 spin_lock_irqsave(&dev->lock, flags);
1502 dev->driver = NULL;
1503 stop_activity(dev, driver);
1504 spin_unlock_irqrestore(&dev->lock, flags);
1505
1506 driver->unbind(&dev->gadget);
1507
1508 DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1509 return 0;
1510}
1511EXPORT_SYMBOL(usb_gadget_unregister_driver);
1512
1513
1514/*-------------------------------------------------------------------------*/
1515
1516static void ep0_setup(struct goku_udc *dev)
1517{
1518 struct goku_udc_regs __iomem *regs = dev->regs;
1519 struct usb_ctrlrequest ctrl;
1520 int tmp;
1521
1522 /* read SETUP packet and enter DATA stage */
1523 ctrl.bRequestType = readl(&regs->bRequestType);
1524 ctrl.bRequest = readl(&regs->bRequest);
988199fe
DB		 1525 ctrl.wValue = cpu_to_le16((readl(&regs->wValueH) << 8)
1526 | readl(&regs->wValueL));
1527 ctrl.wIndex = cpu_to_le16((readl(&regs->wIndexH) << 8)
1528 | readl(&regs->wIndexL));
1529 ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1530 | readl(&regs->wLengthL));
1da177e4
LT		 1531 writel(0, &regs->SetupRecv);
1532
1533 nuke(&dev->ep[0], 0);
1534 dev->ep[0].stopped = 0;
1535 if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1536 dev->ep[0].is_in = 1;
1537 dev->ep0state = EP0_IN;
1538 /* detect early status stages */
1539 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1540 } else {
1541 dev->ep[0].is_in = 0;
1542 dev->ep0state = EP0_OUT;
1543
1544 /* NOTE: CLEAR_FEATURE is done in software so that we can
1545 * synchronize transfer restarts after bulk IN stalls. data
1546 * won't even enter the fifo until the halt is cleared.
1547 */
1548 switch (ctrl.bRequest) {
1549 case USB_REQ_CLEAR_FEATURE:
1550 switch (ctrl.bRequestType) {
1551 case USB_RECIP_ENDPOINT:
988199fe 1552 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1da177e4
LT		 1553 /* active endpoint */
1554 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1555 goto stall;
988199fe
DB		 1556 if (ctrl.wIndex & __constant_cpu_to_le16(
1557 USB_DIR_IN)) {
1da177e4
LT		 1558 if (!dev->ep[tmp].is_in)
1559 goto stall;
1560 } else {
1561 if (dev->ep[tmp].is_in)
1562 goto stall;
1563 }
988199fe
DB		 1564 if (ctrl.wValue != __constant_cpu_to_le16(
1565 USB_ENDPOINT_HALT))
1da177e4
LT		 1566 goto stall;
1567 if (tmp)
1568 goku_clear_halt(&dev->ep[tmp]);
1569succeed:
1570 /* start ep0out status stage */
1571 writel(~(1<<0), &regs->EOP);
1572 dev->ep[0].stopped = 1;
1573 dev->ep0state = EP0_STATUS;
1574 return;
1575 case USB_RECIP_DEVICE:
1576 /* device remote wakeup: always clear */
988199fe 1577 if (ctrl.wValue != __constant_cpu_to_le16(1))
1da177e4
LT		 1578 goto stall;
1579 VDBG(dev, "clear dev remote wakeup\n");
1580 goto succeed;
1581 case USB_RECIP_INTERFACE:
1582 goto stall;
1583 default: /* pass to gadget driver */
1584 break;
1585 }
1586 break;
1587 default:
1588 break;
1589 }
1590 }
1591
1592#ifdef USB_TRACE
1593 VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1594 ctrl.bRequestType, ctrl.bRequest,
988199fe
DB		 1595 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1596 le16_to_cpu(ctrl.wLength));
1da177e4
LT		 1597#endif
1598
1599 /* hw wants to know when we're configured (or not) */
1600 dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1601 && ctrl.bRequestType == USB_RECIP_DEVICE);
1602 if (unlikely(dev->req_config))
988199fe 1603 dev->configured = (ctrl.wValue != __constant_cpu_to_le16(0));
1da177e4
LT		 1604
1605 /* delegate everything to the gadget driver.
1606 * it may respond after this irq handler returns.
1607 */
1608 spin_unlock (&dev->lock);
1609 tmp = dev->driver->setup(&dev->gadget, &ctrl);
1610 spin_lock (&dev->lock);
1611 if (unlikely(tmp < 0)) {
1612stall:
1613#ifdef USB_TRACE
1614 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1615 ctrl.bRequestType, ctrl.bRequest, tmp);
1616#endif
1617 command(regs, COMMAND_STALL, 0);
1618 dev->ep[0].stopped = 1;
1619 dev->ep0state = EP0_STALL;
1620 }
1621
1622 /* expect at least one data or status stage irq */
1623}
1624
1625#define ACK(irqbit) { \
1626 stat &= ~irqbit; \
1627 writel(~irqbit, &regs->int_status); \
1628 handled = 1; \
1629 }
1630
7d12e780 1631static irqreturn_t goku_irq(int irq, void *_dev)
1da177e4
LT		 1632{
1633 struct goku_udc *dev = _dev;
1634 struct goku_udc_regs __iomem *regs = dev->regs;
1635 struct goku_ep *ep;
1636 u32 stat, handled = 0;
1637 unsigned i, rescans = 5;
1638
1639 spin_lock(&dev->lock);
1640
1641rescan:
1642 stat = readl(&regs->int_status) & dev->int_enable;
1643 if (!stat)
1644 goto done;
1645 dev->irqs++;
1646
1647 /* device-wide irqs */
1648 if (unlikely(stat & INT_DEVWIDE)) {
1649 if (stat & INT_SYSERROR) {
1650 ERROR(dev, "system error\n");
1651 stop_activity(dev, dev->driver);
1652 stat = 0;
1653 handled = 1;
1654 // FIXME have a neater way to prevent re-enumeration
1655 dev->driver = NULL;
1656 goto done;
1657 }
1658 if (stat & INT_PWRDETECT) {
1659 writel(~stat, &regs->int_status);
1660 if (readl(&dev->regs->power_detect) & PW_DETECT) {
1661 VDBG(dev, "connect\n");
1662 ep0_start(dev);
1663 } else {
1664 DBG(dev, "disconnect\n");
1665 if (dev->gadget.speed == USB_SPEED_FULL)
1666 stop_activity(dev, dev->driver);
1667 dev->ep0state = EP0_DISCONNECT;
1668 dev->int_enable = INT_DEVWIDE;
1669 writel(dev->int_enable, &dev->regs->int_enable);
1670 }
1671 stat = 0;
1672 handled = 1;
1673 goto done;
1674 }
1675 if (stat & INT_SUSPEND) {
1676 ACK(INT_SUSPEND);
1677 if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1678 switch (dev->ep0state) {
1679 case EP0_DISCONNECT:
1680 case EP0_SUSPEND:
1681 goto pm_next;
1682 default:
1683 break;
1684 }
1685 DBG(dev, "USB suspend\n");
1686 dev->ep0state = EP0_SUSPEND;
1687 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1688 && dev->driver
1689 && dev->driver->suspend) {
1690 spin_unlock(&dev->lock);
1691 dev->driver->suspend(&dev->gadget);
1692 spin_lock(&dev->lock);
1693 }
1694 } else {
1695 if (dev->ep0state != EP0_SUSPEND) {
1696 DBG(dev, "bogus USB resume %d\n",
1697 dev->ep0state);
1698 goto pm_next;
1699 }
1700 DBG(dev, "USB resume\n");
1701 dev->ep0state = EP0_IDLE;
1702 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1703 && dev->driver
1704 && dev->driver->resume) {
1705 spin_unlock(&dev->lock);
1706 dev->driver->resume(&dev->gadget);
1707 spin_lock(&dev->lock);
1708 }
1709 }
1710 }
1711pm_next:
1712 if (stat & INT_USBRESET) { /* hub reset done */
1713 ACK(INT_USBRESET);
1714 INFO(dev, "USB reset done, gadget %s\n",
1715 dev->driver->driver.name);
1716 }
1717 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1718 }
1719
1720 /* progress ep0 setup, data, or status stages.
1721 * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1722 */
1723 if (stat & INT_SETUP) {
1724 ACK(INT_SETUP);
1725 dev->ep[0].irqs++;
1726 ep0_setup(dev);
1727 }
1728 if (stat & INT_STATUSNAK) {
1729 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1730 if (dev->ep0state == EP0_IN) {
1731 ep = &dev->ep[0];
1732 ep->irqs++;
1733 nuke(ep, 0);
1734 writel(~(1<<0), &regs->EOP);
1735 dev->ep0state = EP0_STATUS;
1736 }
1737 }
1738 if (stat & INT_ENDPOINT0) {
1739 ACK(INT_ENDPOINT0);
1740 ep = &dev->ep[0];
1741 ep->irqs++;
1742 pio_advance(ep);
1743 }
1744
1745 /* dma completion */
1746 if (stat & INT_MSTRDEND) { /* IN */
1747 ACK(INT_MSTRDEND);
1748 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1749 ep->irqs++;
1750 dma_advance(dev, ep);
1751 }
1752 if (stat & INT_MSTWREND) { /* OUT */
1753 ACK(INT_MSTWREND);
1754 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1755 ep->irqs++;
1756 dma_advance(dev, ep);
1757 }
1758 if (stat & INT_MSTWRTMOUT) { /* OUT */
1759 ACK(INT_MSTWRTMOUT);
1760 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1761 ep->irqs++;
1762 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1763 // reset dma? then dma_advance()
1764 }
1765
1766 /* pio */
1767 for (i = 1; i < 4; i++) {
1768 u32 tmp = INT_EPxDATASET(i);
1769
1770 if (!(stat & tmp))
1771 continue;
1772 ep = &dev->ep[i];
1773 pio_advance(ep);
1774 if (list_empty (&ep->queue))
1775 pio_irq_disable(dev, regs, i);
1776 stat &= ~tmp;
1777 handled = 1;
1778 ep->irqs++;
1779 }
1780
1781 if (rescans--)
1782 goto rescan;
1783
1784done:
1785 (void)readl(&regs->int_enable);
1786 spin_unlock(&dev->lock);
1787 if (stat)
1788 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1789 readl(&regs->int_status), dev->int_enable);
1790 return IRQ_RETVAL(handled);
1791}
1792
1793#undef ACK
1794
1795/*-------------------------------------------------------------------------*/
1796
1797static void gadget_release(struct device *_dev)
1798{
1799 struct goku_udc *dev = dev_get_drvdata(_dev);
1800
1801 kfree(dev);
1802}
1803
1804/* tear down the binding between this driver and the pci device */
1805
1806static void goku_remove(struct pci_dev *pdev)
1807{
1808 struct goku_udc *dev = pci_get_drvdata(pdev);
1809
1810 DBG(dev, "%s\n", __FUNCTION__);
1811 /* start with the driver above us */
1812 if (dev->driver) {
1813 /* should have been done already by driver model core */
1814 WARN(dev, "pci remove, driver '%s' is still registered\n",
1815 dev->driver->driver.name);
1816 usb_gadget_unregister_driver(dev->driver);
1817 }
1818
1819#ifdef CONFIG_USB_GADGET_DEBUG_FILES
1820 remove_proc_entry(proc_node_name, NULL);
1821#endif
1822 if (dev->regs)
1823 udc_reset(dev);
1824 if (dev->got_irq)
1825 free_irq(pdev->irq, dev);
1826 if (dev->regs)
1827 iounmap(dev->regs);
1828 if (dev->got_region)
1829 release_mem_region(pci_resource_start (pdev, 0),
1830 pci_resource_len (pdev, 0));
1831 if (dev->enabled)
1832 pci_disable_device(pdev);
1833 device_unregister(&dev->gadget.dev);
1834
1835 pci_set_drvdata(pdev, NULL);
1836 dev->regs = NULL;
1837 the_controller = NULL;
1838
1839 INFO(dev, "unbind\n");
1840}
1841
1842/* wrap this driver around the specified pci device, but
1843 * don't respond over USB until a gadget driver binds to us.
1844 */
1845
1846static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1847{
1848 struct goku_udc *dev = NULL;
1849 unsigned long resource, len;
1850 void __iomem *base = NULL;
1851 int retval;
1da177e4
LT		 1852
1853 /* if you want to support more than one controller in a system,
1854 * usb_gadget_driver_{register,unregister}() must change.
1855 */
1856 if (the_controller) {
1857 WARN(dev, "ignoring %s\n", pci_name(pdev));
1858 return -EBUSY;
1859 }
1860 if (!pdev->irq) {
1861 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1862 retval = -ENODEV;
1863 goto done;
1864 }
1865
1866 /* alloc, and start init */
e94b1766 1867 dev = kmalloc (sizeof *dev, GFP_KERNEL);
1da177e4
LT		 1868 if (dev == NULL){
1869 pr_debug("enomem %s\n", pci_name(pdev));
1870 retval = -ENOMEM;
1871 goto done;
1872 }
1873
1874 memset(dev, 0, sizeof *dev);
1875 spin_lock_init(&dev->lock);
1876 dev->pdev = pdev;
1877 dev->gadget.ops = &goku_ops;
1878
1879 /* the "gadget" abstracts/virtualizes the controller */
1880 strcpy(dev->gadget.dev.bus_id, "gadget");
1881 dev->gadget.dev.parent = &pdev->dev;
1882 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1883 dev->gadget.dev.release = gadget_release;
1884 dev->gadget.name = driver_name;
1885
1886 /* now all the pci goodies ... */
1887 retval = pci_enable_device(pdev);
1888 if (retval < 0) {
1889 DBG(dev, "can't enable, %d\n", retval);
1890 goto done;
1891 }
1892 dev->enabled = 1;
1893
1894 resource = pci_resource_start(pdev, 0);
1895 len = pci_resource_len(pdev, 0);
1896 if (!request_mem_region(resource, len, driver_name)) {
1897 DBG(dev, "controller already in use\n");
1898 retval = -EBUSY;
1899 goto done;
1900 }
1901 dev->got_region = 1;
1902
1903 base = ioremap_nocache(resource, len);
1904 if (base == NULL) {
1905 DBG(dev, "can't map memory\n");
1906 retval = -EFAULT;
1907 goto done;
1908 }
1909 dev->regs = (struct goku_udc_regs __iomem *) base;
1910
1911 pci_set_drvdata(pdev, dev);
1912 INFO(dev, "%s\n", driver_desc);
1913 INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
c6387a48 1914 INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1da177e4
LT		 1915
1916 /* init to known state, then setup irqs */
1917 udc_reset(dev);
1918 udc_reinit (dev);
d54b5caa 1919 if (request_irq(pdev->irq, goku_irq, IRQF_SHARED/*|IRQF_SAMPLE_RANDOM*/,
1da177e4 1920 driver_name, dev) != 0) {
c6387a48 1921 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1da177e4
LT		 1922 retval = -EBUSY;
1923 goto done;
1924 }
1925 dev->got_irq = 1;
1926 if (use_dma)
1927 pci_set_master(pdev);
1928
1929
1930#ifdef CONFIG_USB_GADGET_DEBUG_FILES
1931 create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1932#endif
1933
1934 /* done */
1935 the_controller = dev;
1936 device_register(&dev->gadget.dev);
1937
1938 return 0;
1939
1940done:
1941 if (dev)
1942 goku_remove (pdev);
1943 return retval;
1944}
1945
1946
1947/*-------------------------------------------------------------------------*/
1948
1949static struct pci_device_id pci_ids [] = { {
1950 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1951 .class_mask = ~0,
1952 .vendor = 0x102f, /* Toshiba */
1953 .device = 0x0107, /* this UDC */
1954 .subvendor = PCI_ANY_ID,
1955 .subdevice = PCI_ANY_ID,
1956
1957}, { /* end: all zeroes */ }
1958};
1959MODULE_DEVICE_TABLE (pci, pci_ids);
1960
1961static struct pci_driver goku_pci_driver = {
1962 .name = (char *) driver_name,
1963 .id_table = pci_ids,
1964
1965 .probe = goku_probe,
1966 .remove = goku_remove,
1967
1968 /* FIXME add power management support */
1969};
1970
1971static int __init init (void)
1972{
1973 return pci_register_driver (&goku_pci_driver);
1974}
1975module_init (init);
1976
1977static void __exit cleanup (void)
1978{
1979 pci_unregister_driver (&goku_pci_driver);
1980}
1981module_exit (cleanup);
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