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USB: host: ehci-atmel: Add support for HSIC phy
[linux-block.git] / drivers / usb / gadget / udc / goku_udc.c
CommitLineData
5fd54ace 1// SPDX-License-Identifier: GPL-2.0
1da177e4
LT		 2/*
3 * Toshiba TC86C001 ("Goku-S") USB Device Controller driver
4 *
5 * Copyright (C) 2000-2002 Lineo
6 * by Stuart Lynne, Tom Rushworth, and Bruce Balden
7 * Copyright (C) 2002 Toshiba Corporation
8 * Copyright (C) 2003 MontaVista Software (source@mvista.com)
1da177e4
LT		 9 */
10
11/*
12 * This device has ep0 and three semi-configurable bulk/interrupt endpoints.
13 *
14 * - Endpoint numbering is fixed: ep{1,2,3}-bulk
15 * - Gadget drivers can choose ep maxpacket (8/16/32/64)
16 * - Gadget drivers can choose direction (IN, OUT)
17 * - DMA works with ep1 (OUT transfers) and ep2 (IN transfers).
18 */
19
1da177e4
LT		 20// #define VERBOSE /* extra debug messages (success too) */
21// #define USB_TRACE /* packet-level success messages */
22
1da177e4
LT		 23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/pci.h>
26#include <linux/delay.h>
27#include <linux/ioport.h>
1da177e4 28#include <linux/slab.h>
1da177e4 29#include <linux/errno.h>
1da177e4
LT		 30#include <linux/timer.h>
31#include <linux/list.h>
32#include <linux/interrupt.h>
33#include <linux/proc_fs.h>
96c7a22e 34#include <linux/seq_file.h>
1da177e4 35#include <linux/device.h>
5f848137 36#include <linux/usb/ch9.h>
9454a57a 37#include <linux/usb/gadget.h>
268bb0ce 38#include <linux/prefetch.h>
1da177e4
LT		 39
40#include <asm/byteorder.h>
41#include <asm/io.h>
42#include <asm/irq.h>
1da177e4
LT		 43#include <asm/unaligned.h>
44
45
46#include "goku_udc.h"
47
48#define DRIVER_DESC "TC86C001 USB Device Controller"
49#define DRIVER_VERSION "30-Oct 2003"
50
1da177e4
LT		 51static const char driver_name [] = "goku_udc";
52static const char driver_desc [] = DRIVER_DESC;
53
54MODULE_AUTHOR("source@mvista.com");
55MODULE_DESCRIPTION(DRIVER_DESC);
56MODULE_LICENSE("GPL");
57
58
59/*
60 * IN dma behaves ok under testing, though the IN-dma abort paths don't
61 * seem to behave quite as expected. Used by default.
62 *
63 * OUT dma documents design problems handling the common "short packet"
988199fe 64 * transfer termination policy; it couldn't be enabled by default, even
1da177e4
LT		 65 * if the OUT-dma abort problems had a resolution.
66 */
67static unsigned use_dma = 1;
68
69#if 0
70//#include <linux/moduleparam.h>
71/* "modprobe goku_udc use_dma=1" etc
72 * 0 to disable dma
73 * 1 to use IN dma only (normal operation)
74 * 2 to use IN and OUT dma
75 */
76module_param(use_dma, uint, S_IRUGO);
77#endif
78
79/*-------------------------------------------------------------------------*/
80
81static void nuke(struct goku_ep *, int status);
82
83static inline void
84command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
85{
86 writel(COMMAND_EP(epnum) | command, &regs->Command);
87 udelay(300);
88}
89
90static int
91goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
92{
93 struct goku_udc *dev;
94 struct goku_ep *ep;
95 u32 mode;
96 u16 max;
97 unsigned long flags;
98
99 ep = container_of(_ep, struct goku_ep, ep);
aedaa44d 100 if (!_ep || !desc
1da177e4
LT		 101 || desc->bDescriptorType != USB_DT_ENDPOINT)
102 return -EINVAL;
103 dev = ep->dev;
104 if (ep == &dev->ep[0])
105 return -EINVAL;
106 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
107 return -ESHUTDOWN;
9ab15651 108 if (ep->num != usb_endpoint_num(desc))
1da177e4
LT		 109 return -EINVAL;
110
9ab15651 111 switch (usb_endpoint_type(desc)) {
1da177e4
LT		 112 case USB_ENDPOINT_XFER_BULK:
113 case USB_ENDPOINT_XFER_INT:
114 break;
115 default:
116 return -EINVAL;
117 }
118
119 if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
120 != EPxSTATUS_EP_INVALID)
121 return -EBUSY;
122
123 /* enabling the no-toggle interrupt mode would need an api hook */
124 mode = 0;
a5abdeaf 125 max = get_unaligned_le16(&desc->wMaxPacketSize);
1da177e4 126 switch (max) {
457b16d4 127 case 64:
a74005ab
GS		 128 mode++;
129 fallthrough;
457b16d4 130 case 32:
a74005ab
GS		 131 mode++;
132 fallthrough;
457b16d4 133 case 16:
a74005ab
GS		 134 mode++;
135 fallthrough;
457b16d4
GS		 136 case 8:
137 mode <<= 3;
138 break;
1da177e4
LT		 139 default:
140 return -EINVAL;
141 }
142 mode |= 2 << 1; /* bulk, or intr-with-toggle */
143
144 /* ep1/ep2 dma direction is chosen early; it works in the other
145 * direction, with pio. be cautious with out-dma.
146 */
9ab15651 147 ep->is_in = usb_endpoint_dir_in(desc);
1da177e4
LT		 148 if (ep->is_in) {
149 mode |= 1;
150 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
151 } else {
152 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
153 if (ep->dma)
154 DBG(dev, "%s out-dma hides short packets\n",
155 ep->ep.name);
156 }
157
158 spin_lock_irqsave(&ep->dev->lock, flags);
159
160 /* ep1 and ep2 can do double buffering and/or dma */
161 if (ep->num < 3) {
162 struct goku_udc_regs __iomem *regs = ep->dev->regs;
163 u32 tmp;
164
165 /* double buffer except (for now) with pio in */
166 tmp = ((ep->dma || !ep->is_in)
167 ? 0x10 /* double buffered */
168 : 0x11 /* single buffer */
169 ) << ep->num;
170 tmp |= readl(&regs->EPxSingle);
171 writel(tmp, &regs->EPxSingle);
172
173 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
174 tmp |= readl(&regs->EPxBCS);
175 writel(tmp, &regs->EPxBCS);
176 }
177 writel(mode, ep->reg_mode);
178 command(ep->dev->regs, COMMAND_RESET, ep->num);
179 ep->ep.maxpacket = max;
180 ep->stopped = 0;
db79d981 181 ep->ep.desc = desc;
1da177e4
LT		 182 spin_unlock_irqrestore(&ep->dev->lock, flags);
183
184 DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
185 ep->is_in ? "IN" : "OUT",
186 ep->dma ? "dma" : "pio",
187 max);
188
189 return 0;
190}
191
192static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
193{
194 struct goku_udc *dev = ep->dev;
195
196 if (regs) {
197 command(regs, COMMAND_INVALID, ep->num);
198 if (ep->num) {
199 if (ep->num == UDC_MSTWR_ENDPOINT)
200 dev->int_enable &= ~(INT_MSTWREND
201 |INT_MSTWRTMOUT);
202 else if (ep->num == UDC_MSTRD_ENDPOINT)
203 dev->int_enable &= ~INT_MSTRDEND;
204 dev->int_enable &= ~INT_EPxDATASET (ep->num);
205 } else
206 dev->int_enable &= ~INT_EP0;
207 writel(dev->int_enable, &regs->int_enable);
208 readl(&regs->int_enable);
209 if (ep->num < 3) {
210 struct goku_udc_regs __iomem *r = ep->dev->regs;
211 u32 tmp;
212
213 tmp = readl(&r->EPxSingle);
214 tmp &= ~(0x11 << ep->num);
215 writel(tmp, &r->EPxSingle);
216
217 tmp = readl(&r->EPxBCS);
218 tmp &= ~(0x11 << ep->num);
219 writel(tmp, &r->EPxBCS);
220 }
221 /* reset dma in case we're still using it */
222 if (ep->dma) {
223 u32 master;
224
225 master = readl(&regs->dma_master) & MST_RW_BITS;
226 if (ep->num == UDC_MSTWR_ENDPOINT) {
227 master &= ~MST_W_BITS;
228 master |= MST_WR_RESET;
229 } else {
230 master &= ~MST_R_BITS;
231 master |= MST_RD_RESET;
232 }
233 writel(master, &regs->dma_master);
234 }
235 }
236
e117e742 237 usb_ep_set_maxpacket_limit(&ep->ep, MAX_FIFO_SIZE);
f9c56cdd 238 ep->ep.desc = NULL;
1da177e4
LT		 239 ep->stopped = 1;
240 ep->irqs = 0;
241 ep->dma = 0;
242}
243
244static int goku_ep_disable(struct usb_ep *_ep)
245{
246 struct goku_ep *ep;
247 struct goku_udc *dev;
248 unsigned long flags;
249
250 ep = container_of(_ep, struct goku_ep, ep);
db79d981 251 if (!_ep || !ep->ep.desc)
1da177e4
LT		 252 return -ENODEV;
253 dev = ep->dev;
254 if (dev->ep0state == EP0_SUSPEND)
255 return -EBUSY;
256
257 VDBG(dev, "disable %s\n", _ep->name);
258
259 spin_lock_irqsave(&dev->lock, flags);
260 nuke(ep, -ESHUTDOWN);
261 ep_reset(dev->regs, ep);
262 spin_unlock_irqrestore(&dev->lock, flags);
263
264 return 0;
265}
266
267/*-------------------------------------------------------------------------*/
268
269static struct usb_request *
55016f10 270goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
1da177e4
LT		 271{
272 struct goku_request *req;
273
274 if (!_ep)
275 return NULL;
7039f422 276 req = kzalloc(sizeof *req, gfp_flags);
1da177e4
LT		 277 if (!req)
278 return NULL;
279
1da177e4
LT		 280 INIT_LIST_HEAD(&req->queue);
281 return &req->req;
282}
283
284static void
285goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
286{
287 struct goku_request *req;
288
289 if (!_ep || !_req)
290 return;
291
292 req = container_of(_req, struct goku_request, req);
293 WARN_ON(!list_empty(&req->queue));
294 kfree(req);
295}
296
297/*-------------------------------------------------------------------------*/
298
1da177e4
LT		 299static void
300done(struct goku_ep *ep, struct goku_request *req, int status)
301{
302 struct goku_udc *dev;
303 unsigned stopped = ep->stopped;
304
305 list_del_init(&req->queue);
306
307 if (likely(req->req.status == -EINPROGRESS))
308 req->req.status = status;
309 else
310 status = req->req.status;
311
312 dev = ep->dev;
6440093f
FB		 313
314 if (ep->dma)
315 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
1da177e4
LT		 316
317#ifndef USB_TRACE
318 if (status && status != -ESHUTDOWN)
319#endif
320 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
321 ep->ep.name, &req->req, status,
322 req->req.actual, req->req.length);
323
324 /* don't modify queue heads during completion callback */
325 ep->stopped = 1;
326 spin_unlock(&dev->lock);
304f7e5e 327 usb_gadget_giveback_request(&ep->ep, &req->req);
1da177e4
LT		 328 spin_lock(&dev->lock);
329 ep->stopped = stopped;
330}
331
332/*-------------------------------------------------------------------------*/
333
334static inline int
335write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
336{
337 unsigned length, count;
338
339 length = min(req->req.length - req->req.actual, max);
340 req->req.actual += length;
341
342 count = length;
343 while (likely(count--))
344 writel(*buf++, fifo);
345 return length;
346}
347
348// return: 0 = still running, 1 = completed, negative = errno
349static int write_fifo(struct goku_ep *ep, struct goku_request *req)
350{
351 struct goku_udc *dev = ep->dev;
352 u32 tmp;
353 u8 *buf;
354 unsigned count;
355 int is_last;
356
357 tmp = readl(&dev->regs->DataSet);
358 buf = req->req.buf + req->req.actual;
359 prefetch(buf);
360
361 dev = ep->dev;
362 if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
363 return -EL2HLT;
364
365 /* NOTE: just single-buffered PIO-IN for now. */
366 if (unlikely((tmp & DATASET_A(ep->num)) != 0))
367 return 0;
368
369 /* clear our "packet available" irq */
370 if (ep->num != 0)
371 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
372
373 count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
374
375 /* last packet often short (sometimes a zlp, especially on ep0) */
376 if (unlikely(count != ep->ep.maxpacket)) {
377 writel(~(1<<ep->num), &dev->regs->EOP);
378 if (ep->num == 0) {
379 dev->ep[0].stopped = 1;
380 dev->ep0state = EP0_STATUS;
381 }
382 is_last = 1;
383 } else {
384 if (likely(req->req.length != req->req.actual)
385 || req->req.zero)
386 is_last = 0;
387 else
388 is_last = 1;
389 }
390#if 0 /* printk seemed to trash is_last...*/
391//#ifdef USB_TRACE
392 VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
393 ep->ep.name, count, is_last ? "/last" : "",
394 req->req.length - req->req.actual, req);
395#endif
396
397 /* requests complete when all IN data is in the FIFO,
398 * or sometimes later, if a zlp was needed.
399 */
400 if (is_last) {
401 done(ep, req, 0);
402 return 1;
403 }
404
405 return 0;
406}
407
408static int read_fifo(struct goku_ep *ep, struct goku_request *req)
409{
410 struct goku_udc_regs __iomem *regs;
411 u32 size, set;
412 u8 *buf;
413 unsigned bufferspace, is_short, dbuff;
414
415 regs = ep->dev->regs;
416top:
417 buf = req->req.buf + req->req.actual;
418 prefetchw(buf);
419
420 if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
421 return -EL2HLT;
422
423 dbuff = (ep->num == 1 || ep->num == 2);
424 do {
425 /* ack dataset irq matching the status we'll handle */
426 if (ep->num != 0)
427 writel(~INT_EPxDATASET(ep->num), &regs->int_status);
428
429 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
430 size = readl(&regs->EPxSizeLA[ep->num]);
431 bufferspace = req->req.length - req->req.actual;
432
433 /* usually do nothing without an OUT packet */
434 if (likely(ep->num != 0 || bufferspace != 0)) {
435 if (unlikely(set == 0))
436 break;
437 /* use ep1/ep2 double-buffering for OUT */
438 if (!(size & PACKET_ACTIVE))
439 size = readl(&regs->EPxSizeLB[ep->num]);
2d70c99b 440 if (!(size & PACKET_ACTIVE)) /* "can't happen" */
1da177e4
LT		 441 break;
442 size &= DATASIZE; /* EPxSizeH == 0 */
443
444 /* ep0out no-out-data case for set_config, etc */
445 } else
446 size = 0;
447
448 /* read all bytes from this packet */
449 req->req.actual += size;
450 is_short = (size < ep->ep.maxpacket);
451#ifdef USB_TRACE
452 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
453 ep->ep.name, size, is_short ? "/S" : "",
454 req, req->req.actual, req->req.length);
455#endif
456 while (likely(size-- != 0)) {
457 u8 byte = (u8) readl(ep->reg_fifo);
458
459 if (unlikely(bufferspace == 0)) {
460 /* this happens when the driver's buffer
461 * is smaller than what the host sent.
462 * discard the extra data in this packet.
463 */
464 if (req->req.status != -EOVERFLOW)
465 DBG(ep->dev, "%s overflow %u\n",
466 ep->ep.name, size);
467 req->req.status = -EOVERFLOW;
468 } else {
469 *buf++ = byte;
470 bufferspace--;
471 }
472 }
473
474 /* completion */
475 if (unlikely(is_short || req->req.actual == req->req.length)) {
476 if (unlikely(ep->num == 0)) {
477 /* non-control endpoints now usable? */
478 if (ep->dev->req_config)
479 writel(ep->dev->configured
480 ? USBSTATE_CONFIGURED
481 : 0,
482 &regs->UsbState);
483 /* ep0out status stage */
484 writel(~(1<<0), &regs->EOP);
485 ep->stopped = 1;
486 ep->dev->ep0state = EP0_STATUS;
487 }
488 done(ep, req, 0);
489
490 /* empty the second buffer asap */
491 if (dbuff && !list_empty(&ep->queue)) {
492 req = list_entry(ep->queue.next,
493 struct goku_request, queue);
494 goto top;
495 }
496 return 1;
497 }
498 } while (dbuff);
499 return 0;
500}
501
502static inline void
503pio_irq_enable(struct goku_udc *dev,
504 struct goku_udc_regs __iomem *regs, int epnum)
505{
506 dev->int_enable |= INT_EPxDATASET (epnum);
507 writel(dev->int_enable, &regs->int_enable);
508 /* write may still be posted */
509}
510
511static inline void
512pio_irq_disable(struct goku_udc *dev,
513 struct goku_udc_regs __iomem *regs, int epnum)
514{
515 dev->int_enable &= ~INT_EPxDATASET (epnum);
516 writel(dev->int_enable, &regs->int_enable);
517 /* write may still be posted */
518}
519
520static inline void
521pio_advance(struct goku_ep *ep)
522{
523 struct goku_request *req;
524
525 if (unlikely(list_empty (&ep->queue)))
526 return;
527 req = list_entry(ep->queue.next, struct goku_request, queue);
528 (ep->is_in ? write_fifo : read_fifo)(ep, req);
529}
530
531
532/*-------------------------------------------------------------------------*/
533
534// return: 0 = q running, 1 = q stopped, negative = errno
535static int start_dma(struct goku_ep *ep, struct goku_request *req)
536{
537 struct goku_udc_regs __iomem *regs = ep->dev->regs;
538 u32 master;
539 u32 start = req->req.dma;
540 u32 end = start + req->req.length - 1;
541
542 master = readl(&regs->dma_master) & MST_RW_BITS;
543
544 /* re-init the bits affecting IN dma; careful with zlps */
545 if (likely(ep->is_in)) {
546 if (unlikely(master & MST_RD_ENA)) {
547 DBG (ep->dev, "start, IN active dma %03x!!\n",
548 master);
549// return -EL2HLT;
550 }
551 writel(end, &regs->in_dma_end);
552 writel(start, &regs->in_dma_start);
553
554 master &= ~MST_R_BITS;
555 if (unlikely(req->req.length == 0))
556 master = MST_RD_ENA | MST_RD_EOPB;
557 else if ((req->req.length % ep->ep.maxpacket) != 0
558 || req->req.zero)
559 master = MST_RD_ENA | MST_EOPB_ENA;
560 else
561 master = MST_RD_ENA | MST_EOPB_DIS;
562
563 ep->dev->int_enable |= INT_MSTRDEND;
564
565 /* Goku DMA-OUT merges short packets, which plays poorly with
566 * protocols where short packets mark the transfer boundaries.
567 * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
568 * ending transfers after 3 SOFs; we don't turn it on.
569 */
570 } else {
571 if (unlikely(master & MST_WR_ENA)) {
572 DBG (ep->dev, "start, OUT active dma %03x!!\n",
573 master);
574// return -EL2HLT;
575 }
576 writel(end, &regs->out_dma_end);
577 writel(start, &regs->out_dma_start);
578
579 master &= ~MST_W_BITS;
580 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
581
582 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
583 }
584
585 writel(master, &regs->dma_master);
586 writel(ep->dev->int_enable, &regs->int_enable);
587 return 0;
588}
589
590static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
591{
592 struct goku_request *req;
593 struct goku_udc_regs __iomem *regs = ep->dev->regs;
594 u32 master;
595
596 master = readl(&regs->dma_master);
597
598 if (unlikely(list_empty(&ep->queue))) {
599stop:
600 if (ep->is_in)
601 dev->int_enable &= ~INT_MSTRDEND;
602 else
603 dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
604 writel(dev->int_enable, &regs->int_enable);
605 return;
606 }
607 req = list_entry(ep->queue.next, struct goku_request, queue);
608
609 /* normal hw dma completion (not abort) */
610 if (likely(ep->is_in)) {
611 if (unlikely(master & MST_RD_ENA))
612 return;
613 req->req.actual = readl(&regs->in_dma_current);
614 } else {
615 if (unlikely(master & MST_WR_ENA))
616 return;
617
618 /* hardware merges short packets, and also hides packet
619 * overruns. a partial packet MAY be in the fifo here.
620 */
621 req->req.actual = readl(&regs->out_dma_current);
622 }
623 req->req.actual -= req->req.dma;
624 req->req.actual++;
625
626#ifdef USB_TRACE
627 VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
628 ep->ep.name, ep->is_in ? "IN" : "OUT",
629 req->req.actual, req->req.length, req);
630#endif
631 done(ep, req, 0);
632 if (list_empty(&ep->queue))
633 goto stop;
634 req = list_entry(ep->queue.next, struct goku_request, queue);
635 (void) start_dma(ep, req);
636}
637
638static void abort_dma(struct goku_ep *ep, int status)
639{
640 struct goku_udc_regs __iomem *regs = ep->dev->regs;
641 struct goku_request *req;
642 u32 curr, master;
643
644 /* NAK future host requests, hoping the implicit delay lets the
645 * dma engine finish reading (or writing) its latest packet and
646 * empty the dma buffer (up to 16 bytes).
647 *
648 * This avoids needing to clean up a partial packet in the fifo;
649 * we can't do that for IN without side effects to HALT and TOGGLE.
650 */
651 command(regs, COMMAND_FIFO_DISABLE, ep->num);
652 req = list_entry(ep->queue.next, struct goku_request, queue);
653 master = readl(&regs->dma_master) & MST_RW_BITS;
654
655 /* FIXME using these resets isn't usably documented. this may
656 * not work unless it's followed by disabling the endpoint.
657 *
658 * FIXME the OUT reset path doesn't even behave consistently.
659 */
660 if (ep->is_in) {
661 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
662 goto finished;
663 curr = readl(&regs->in_dma_current);
664
665 writel(curr, &regs->in_dma_end);
666 writel(curr, &regs->in_dma_start);
667
668 master &= ~MST_R_BITS;
669 master |= MST_RD_RESET;
670 writel(master, &regs->dma_master);
671
672 if (readl(&regs->dma_master) & MST_RD_ENA)
673 DBG(ep->dev, "IN dma active after reset!\n");
674
675 } else {
676 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
677 goto finished;
678 curr = readl(&regs->out_dma_current);
679
680 writel(curr, &regs->out_dma_end);
681 writel(curr, &regs->out_dma_start);
682
683 master &= ~MST_W_BITS;
684 master |= MST_WR_RESET;
685 writel(master, &regs->dma_master);
686
687 if (readl(&regs->dma_master) & MST_WR_ENA)
688 DBG(ep->dev, "OUT dma active after reset!\n");
689 }
690 req->req.actual = (curr - req->req.dma) + 1;
691 req->req.status = status;
692
441b62c1 693 VDBG(ep->dev, "%s %s %s %d/%d\n", __func__, ep->ep.name,
1da177e4
LT		 694 ep->is_in ? "IN" : "OUT",
695 req->req.actual, req->req.length);
696
697 command(regs, COMMAND_FIFO_ENABLE, ep->num);
698
699 return;
700
701finished:
702 /* dma already completed; no abort needed */
703 command(regs, COMMAND_FIFO_ENABLE, ep->num);
704 req->req.actual = req->req.length;
705 req->req.status = 0;
706}
707
708/*-------------------------------------------------------------------------*/
709
710static int
55016f10 711goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
1da177e4
LT		 712{
713 struct goku_request *req;
714 struct goku_ep *ep;
715 struct goku_udc *dev;
716 unsigned long flags;
717 int status;
718
719 /* always require a cpu-view buffer so pio works */
720 req = container_of(_req, struct goku_request, req);
721 if (unlikely(!_req || !_req->complete
722 || !_req->buf || !list_empty(&req->queue)))
723 return -EINVAL;
724 ep = container_of(_ep, struct goku_ep, ep);
db79d981 725 if (unlikely(!_ep || (!ep->ep.desc && ep->num != 0)))
1da177e4
LT		 726 return -EINVAL;
727 dev = ep->dev;
728 if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
729 return -ESHUTDOWN;
730
731 /* can't touch registers when suspended */
732 if (dev->ep0state == EP0_SUSPEND)
733 return -EBUSY;
734
735 /* set up dma mapping in case the caller didn't */
6440093f
FB		 736 if (ep->dma) {
737 status = usb_gadget_map_request(&dev->gadget, &req->req,
738 ep->is_in);
739 if (status)
740 return status;
1da177e4
LT		 741 }
742
743#ifdef USB_TRACE
744 VDBG(dev, "%s queue req %p, len %u buf %p\n",
745 _ep->name, _req, _req->length, _req->buf);
746#endif
747
748 spin_lock_irqsave(&dev->lock, flags);
749
750 _req->status = -EINPROGRESS;
751 _req->actual = 0;
752
753 /* for ep0 IN without premature status, zlp is required and
754 * writing EOP starts the status stage (OUT).
755 */
756 if (unlikely(ep->num == 0 && ep->is_in))
757 _req->zero = 1;
758
759 /* kickstart this i/o queue? */
760 status = 0;
761 if (list_empty(&ep->queue) && likely(!ep->stopped)) {
762 /* dma: done after dma completion IRQ (or error)
763 * pio: done after last fifo operation
764 */
765 if (ep->dma)
766 status = start_dma(ep, req);
767 else
768 status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
769
770 if (unlikely(status != 0)) {
771 if (status > 0)
772 status = 0;
773 req = NULL;
774 }
775
776 } /* else pio or dma irq handler advances the queue. */
777
027ca0d2 778 if (likely(req != NULL))
1da177e4
LT		 779 list_add_tail(&req->queue, &ep->queue);
780
781 if (likely(!list_empty(&ep->queue))
782 && likely(ep->num != 0)
783 && !ep->dma
784 && !(dev->int_enable & INT_EPxDATASET (ep->num)))
785 pio_irq_enable(dev, dev->regs, ep->num);
786
787 spin_unlock_irqrestore(&dev->lock, flags);
788
789 /* pci writes may still be posted */
790 return status;
791}
792
793/* dequeue ALL requests */
794static void nuke(struct goku_ep *ep, int status)
795{
796 struct goku_request *req;
797
798 ep->stopped = 1;
799 if (list_empty(&ep->queue))
800 return;
801 if (ep->dma)
802 abort_dma(ep, status);
803 while (!list_empty(&ep->queue)) {
804 req = list_entry(ep->queue.next, struct goku_request, queue);
805 done(ep, req, status);
806 }
807}
808
809/* dequeue JUST ONE request */
810static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
811{
812 struct goku_request *req;
813 struct goku_ep *ep;
814 struct goku_udc *dev;
815 unsigned long flags;
816
817 ep = container_of(_ep, struct goku_ep, ep);
db79d981 818 if (!_ep || !_req || (!ep->ep.desc && ep->num != 0))
1da177e4
LT		 819 return -EINVAL;
820 dev = ep->dev;
821 if (!dev->driver)
822 return -ESHUTDOWN;
823
824 /* we can't touch (dma) registers when suspended */
825 if (dev->ep0state == EP0_SUSPEND)
826 return -EBUSY;
827
441b62c1 828 VDBG(dev, "%s %s %s %s %p\n", __func__, _ep->name,
1da177e4
LT		 829 ep->is_in ? "IN" : "OUT",
830 ep->dma ? "dma" : "pio",
831 _req);
832
833 spin_lock_irqsave(&dev->lock, flags);
834
835 /* make sure it's actually queued on this endpoint */
836 list_for_each_entry (req, &ep->queue, queue) {
837 if (&req->req == _req)
838 break;
839 }
840 if (&req->req != _req) {
841 spin_unlock_irqrestore (&dev->lock, flags);
842 return -EINVAL;
843 }
844
845 if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
846 abort_dma(ep, -ECONNRESET);
847 done(ep, req, -ECONNRESET);
848 dma_advance(dev, ep);
849 } else if (!list_empty(&req->queue))
850 done(ep, req, -ECONNRESET);
851 else
852 req = NULL;
853 spin_unlock_irqrestore(&dev->lock, flags);
854
855 return req ? 0 : -EOPNOTSUPP;
856}
857
858/*-------------------------------------------------------------------------*/
859
860static void goku_clear_halt(struct goku_ep *ep)
861{
862 // assert (ep->num !=0)
863 VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
864 command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
865 command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
866 if (ep->stopped) {
867 ep->stopped = 0;
868 if (ep->dma) {
869 struct goku_request *req;
870
871 if (list_empty(&ep->queue))
872 return;
873 req = list_entry(ep->queue.next, struct goku_request,
874 queue);
875 (void) start_dma(ep, req);
876 } else
877 pio_advance(ep);
878 }
879}
880
881static int goku_set_halt(struct usb_ep *_ep, int value)
882{
883 struct goku_ep *ep;
884 unsigned long flags;
885 int retval = 0;
886
887 if (!_ep)
888 return -ENODEV;
889 ep = container_of (_ep, struct goku_ep, ep);
890
891 if (ep->num == 0) {
892 if (value) {
893 ep->dev->ep0state = EP0_STALL;
894 ep->dev->ep[0].stopped = 1;
895 } else
896 return -EINVAL;
897
898 /* don't change EPxSTATUS_EP_INVALID to READY */
db79d981 899 } else if (!ep->ep.desc) {
441b62c1 900 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
1da177e4
LT		 901 return -EINVAL;
902 }
903
904 spin_lock_irqsave(&ep->dev->lock, flags);
905 if (!list_empty(&ep->queue))
906 retval = -EAGAIN;
907 else if (ep->is_in && value
908 /* data in (either) packet buffer? */
909 && (readl(&ep->dev->regs->DataSet)
910 & DATASET_AB(ep->num)))
911 retval = -EAGAIN;
912 else if (!value)
913 goku_clear_halt(ep);
914 else {
915 ep->stopped = 1;
916 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
917 command(ep->dev->regs, COMMAND_STALL, ep->num);
918 readl(ep->reg_status);
919 }
920 spin_unlock_irqrestore(&ep->dev->lock, flags);
921 return retval;
922}
923
924static int goku_fifo_status(struct usb_ep *_ep)
925{
926 struct goku_ep *ep;
927 struct goku_udc_regs __iomem *regs;
928 u32 size;
929
930 if (!_ep)
931 return -ENODEV;
932 ep = container_of(_ep, struct goku_ep, ep);
933
934 /* size is only reported sanely for OUT */
935 if (ep->is_in)
936 return -EOPNOTSUPP;
937
938 /* ignores 16-byte dma buffer; SizeH == 0 */
939 regs = ep->dev->regs;
940 size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
941 size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
441b62c1 942 VDBG(ep->dev, "%s %s %u\n", __func__, ep->ep.name, size);
1da177e4
LT		 943 return size;
944}
945
946static void goku_fifo_flush(struct usb_ep *_ep)
947{
948 struct goku_ep *ep;
949 struct goku_udc_regs __iomem *regs;
950 u32 size;
951
952 if (!_ep)
953 return;
954 ep = container_of(_ep, struct goku_ep, ep);
441b62c1 955 VDBG(ep->dev, "%s %s\n", __func__, ep->ep.name);
1da177e4
LT		 956
957 /* don't change EPxSTATUS_EP_INVALID to READY */
db79d981 958 if (!ep->ep.desc && ep->num != 0) {
441b62c1 959 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
1da177e4
LT		 960 return;
961 }
962
963 regs = ep->dev->regs;
964 size = readl(&regs->EPxSizeLA[ep->num]);
965 size &= DATASIZE;
966
967 /* Non-desirable behavior: FIFO_CLEAR also clears the
968 * endpoint halt feature. For OUT, we _could_ just read
969 * the bytes out (PIO, if !ep->dma); for in, no choice.
970 */
971 if (size)
972 command(regs, COMMAND_FIFO_CLEAR, ep->num);
973}
974
977ac789 975static const struct usb_ep_ops goku_ep_ops = {
1da177e4
LT		 976 .enable = goku_ep_enable,
977 .disable = goku_ep_disable,
978
979 .alloc_request = goku_alloc_request,
980 .free_request = goku_free_request,
981
1da177e4
LT		 982 .queue = goku_queue,
983 .dequeue = goku_dequeue,
984
985 .set_halt = goku_set_halt,
986 .fifo_status = goku_fifo_status,
987 .fifo_flush = goku_fifo_flush,
988};
989
990/*-------------------------------------------------------------------------*/
991
992static int goku_get_frame(struct usb_gadget *_gadget)
993{
994 return -EOPNOTSUPP;
995}
996
8cc67b7b
RB		 997static struct usb_ep *goku_match_ep(struct usb_gadget *g,
998 struct usb_endpoint_descriptor *desc,
999 struct usb_ss_ep_comp_descriptor *ep_comp)
1000{
1001 struct goku_udc *dev = to_goku_udc(g);
1002 struct usb_ep *ep;
1003
1004 switch (usb_endpoint_type(desc)) {
1005 case USB_ENDPOINT_XFER_INT:
1006 /* single buffering is enough */
1007 ep = &dev->ep[3].ep;
1008 if (usb_gadget_ep_match_desc(g, ep, desc, ep_comp))
1009 return ep;
1010 break;
1011 case USB_ENDPOINT_XFER_BULK:
1012 if (usb_endpoint_dir_in(desc)) {
1013 /* DMA may be available */
1014 ep = &dev->ep[2].ep;
1015 if (usb_gadget_ep_match_desc(g, ep, desc, ep_comp))
1016 return ep;
1017 }
1018 break;
1019 default:
1020 /* nothing */ ;
1021 }
1022
1023 return NULL;
1024}
1025
950b3c1d
FB		 1026static int goku_udc_start(struct usb_gadget *g,
1027 struct usb_gadget_driver *driver);
22835b80 1028static int goku_udc_stop(struct usb_gadget *g);
0f91349b 1029
1da177e4
LT		 1030static const struct usb_gadget_ops goku_ops = {
1031 .get_frame = goku_get_frame,
950b3c1d
FB		 1032 .udc_start = goku_udc_start,
1033 .udc_stop = goku_udc_stop,
8cc67b7b 1034 .match_ep = goku_match_ep,
1da177e4
LT		 1035 // no remote wakeup
1036 // not selfpowered
1037};
1038
1039/*-------------------------------------------------------------------------*/
1040
96c7a22e 1041static inline const char *dmastr(void)
1da177e4
LT		 1042{
1043 if (use_dma == 0)
1044 return "(dma disabled)";
1045 else if (use_dma == 2)
1046 return "(dma IN and OUT)";
1047 else
1048 return "(dma IN)";
1049}
1050
1051#ifdef CONFIG_USB_GADGET_DEBUG_FILES
1052
1053static const char proc_node_name [] = "driver/udc";
1054
1055#define FOURBITS "%s%s%s%s"
1056#define EIGHTBITS FOURBITS FOURBITS
1057
96c7a22e 1058static void dump_intmask(struct seq_file *m, const char *label, u32 mask)
1da177e4 1059{
1da177e4 1060 /* int_status is the same format ... */
557f3586
JP		 1061 seq_printf(m, "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1062 label, mask,
1063 (mask & INT_PWRDETECT) ? " power" : "",
1064 (mask & INT_SYSERROR) ? " sys" : "",
1065 (mask & INT_MSTRDEND) ? " in-dma" : "",
1066 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1067
1068 (mask & INT_MSTWREND) ? " out-dma" : "",
1069 (mask & INT_MSTWRSET) ? " wrset" : "",
1070 (mask & INT_ERR) ? " err" : "",
1071 (mask & INT_SOF) ? " sof" : "",
1072
1073 (mask & INT_EP3NAK) ? " ep3nak" : "",
1074 (mask & INT_EP2NAK) ? " ep2nak" : "",
1075 (mask & INT_EP1NAK) ? " ep1nak" : "",
1076 (mask & INT_EP3DATASET) ? " ep3" : "",
1077
1078 (mask & INT_EP2DATASET) ? " ep2" : "",
1079 (mask & INT_EP1DATASET) ? " ep1" : "",
1080 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1081 (mask & INT_STATUS) ? " ep0status" : "",
1082
1083 (mask & INT_SETUP) ? " setup" : "",
1084 (mask & INT_ENDPOINT0) ? " ep0" : "",
1085 (mask & INT_USBRESET) ? " reset" : "",
1086 (mask & INT_SUSPEND) ? " suspend" : "");
1087}
1088
1089static const char *udc_ep_state(enum ep0state state)
1090{
1091 switch (state) {
1092 case EP0_DISCONNECT:
1093 return "ep0_disconnect";
1094 case EP0_IDLE:
1095 return "ep0_idle";
1096 case EP0_IN:
1097 return "ep0_in";
1098 case EP0_OUT:
1099 return "ep0_out";
1100 case EP0_STATUS:
1101 return "ep0_status";
1102 case EP0_STALL:
1103 return "ep0_stall";
1104 case EP0_SUSPEND:
1105 return "ep0_suspend";
1106 }
1107
1108 return "ep0_?";
1da177e4
LT		 1109}
1110
557f3586
JP		 1111static const char *udc_ep_status(u32 status)
1112{
1113 switch (status & EPxSTATUS_EP_MASK) {
1114 case EPxSTATUS_EP_READY:
1115 return "ready";
1116 case EPxSTATUS_EP_DATAIN:
1117 return "packet";
1118 case EPxSTATUS_EP_FULL:
1119 return "full";
1120 case EPxSTATUS_EP_TX_ERR: /* host will retry */
1121 return "tx_err";
1122 case EPxSTATUS_EP_RX_ERR:
1123 return "rx_err";
1124 case EPxSTATUS_EP_BUSY: /* ep0 only */
1125 return "busy";
1126 case EPxSTATUS_EP_STALL:
1127 return "stall";
1128 case EPxSTATUS_EP_INVALID: /* these "can't happen" */
1129 return "invalid";
1130 }
1131
1132 return "?";
1133}
1da177e4 1134
96c7a22e 1135static int udc_proc_read(struct seq_file *m, void *v)
1da177e4 1136{
96c7a22e 1137 struct goku_udc *dev = m->private;
1da177e4 1138 struct goku_udc_regs __iomem *regs = dev->regs;
1da177e4 1139 unsigned long flags;
96c7a22e 1140 int i, is_usb_connected;
1da177e4
LT		 1141 u32 tmp;
1142
1da177e4
LT		 1143 local_irq_save(flags);
1144
1145 /* basic device status */
1146 tmp = readl(&regs->power_detect);
1147 is_usb_connected = tmp & PW_DETECT;
96c7a22e 1148 seq_printf(m,
557f3586
JP		 1149 "%s - %s\n"
1150 "%s version: %s %s\n"
1151 "Gadget driver: %s\n"
1152 "Host %s, %s\n"
1153 "\n",
1154 pci_name(dev->pdev), driver_desc,
1155 driver_name, DRIVER_VERSION, dmastr(),
1156 dev->driver ? dev->driver->driver.name : "(none)",
1157 is_usb_connected
1158 ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1159 : "disconnected",
1160 udc_ep_state(dev->ep0state));
1da177e4 1161
96c7a22e
DH		 1162 dump_intmask(m, "int_status", readl(&regs->int_status));
1163 dump_intmask(m, "int_enable", readl(&regs->int_enable));
1da177e4
LT		 1164
1165 if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1166 goto done;
1167
1168 /* registers for (active) device and ep0 */
557f3586
JP		 1169 seq_printf(m, "\nirqs %lu\ndataset %02x single.bcs %02x.%02x state %x addr %u\n",
1170 dev->irqs, readl(&regs->DataSet),
1171 readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1172 readl(&regs->UsbState),
1173 readl(&regs->address));
1174 if (seq_has_overflowed(m))
96c7a22e 1175 goto done;
1da177e4
LT		 1176
1177 tmp = readl(&regs->dma_master);
557f3586
JP		 1178 seq_printf(m, "dma %03X =" EIGHTBITS "%s %s\n",
1179 tmp,
1180 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1181 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1182 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1183 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1184
1185 (tmp & MST_RD_EOPB) ? " eopb" : "",
1186 (tmp & MST_RD_RESET) ? " in_reset" : "",
1187 (tmp & MST_WR_RESET) ? " out_reset" : "",
1188 (tmp & MST_RD_ENA) ? " IN" : "",
1189
1190 (tmp & MST_WR_ENA) ? " OUT" : "",
1191 (tmp & MST_CONNECTION) ? "ep1in/ep2out" : "ep1out/ep2in");
1192 if (seq_has_overflowed(m))
96c7a22e 1193 goto done;
1da177e4
LT		 1194
1195 /* dump endpoint queues */
1196 for (i = 0; i < 4; i++) {
1197 struct goku_ep *ep = &dev->ep [i];
1198 struct goku_request *req;
1da177e4 1199
db79d981 1200 if (i && !ep->ep.desc)
1da177e4
LT		 1201 continue;
1202
1203 tmp = readl(ep->reg_status);
557f3586
JP		 1204 seq_printf(m, "%s %s max %u %s, irqs %lu, status %02x (%s) " FOURBITS "\n",
1205 ep->ep.name,
1206 ep->is_in ? "in" : "out",
1207 ep->ep.maxpacket,
1208 ep->dma ? "dma" : "pio",
1209 ep->irqs,
1210 tmp, udc_ep_status(tmp),
1211 (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1212 (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1213 (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1214 (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : "");
1215 if (seq_has_overflowed(m))
1da177e4 1216 goto done;
1da177e4
LT		 1217
1218 if (list_empty(&ep->queue)) {
557f3586
JP		 1219 seq_puts(m, "\t(nothing queued)\n");
1220 if (seq_has_overflowed(m))
1da177e4 1221 goto done;
1da177e4
LT		 1222 continue;
1223 }
1224 list_for_each_entry(req, &ep->queue, queue) {
1225 if (ep->dma && req->queue.prev == &ep->queue) {
1226 if (i == UDC_MSTRD_ENDPOINT)
1227 tmp = readl(&regs->in_dma_current);
1228 else
1229 tmp = readl(&regs->out_dma_current);
1230 tmp -= req->req.dma;
1231 tmp++;
1232 } else
1233 tmp = req->req.actual;
1234
557f3586
JP		 1235 seq_printf(m, "\treq %p len %u/%u buf %p\n",
1236 &req->req, tmp, req->req.length,
1237 req->req.buf);
1238 if (seq_has_overflowed(m))
1da177e4 1239 goto done;
1da177e4
LT		 1240 }
1241 }
1242
1243done:
1244 local_irq_restore(flags);
96c7a22e
DH		 1245 return 0;
1246}
1da177e4
LT		 1247#endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1248
1249/*-------------------------------------------------------------------------*/
1250
1251static void udc_reinit (struct goku_udc *dev)
1252{
1253 static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
2d70c99b 1254
1da177e4
LT		 1255 unsigned i;
1256
1257 INIT_LIST_HEAD (&dev->gadget.ep_list);
1258 dev->gadget.ep0 = &dev->ep [0].ep;
1259 dev->gadget.speed = USB_SPEED_UNKNOWN;
1260 dev->ep0state = EP0_DISCONNECT;
1261 dev->irqs = 0;
1262
1263 for (i = 0; i < 4; i++) {
1264 struct goku_ep *ep = &dev->ep[i];
1265
1266 ep->num = i;
1267 ep->ep.name = names[i];
1268 ep->reg_fifo = &dev->regs->ep_fifo [i];
1269 ep->reg_status = &dev->regs->ep_status [i];
1270 ep->reg_mode = &dev->regs->ep_mode[i];
1271
1272 ep->ep.ops = &goku_ep_ops;
1273 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1274 ep->dev = dev;
1275 INIT_LIST_HEAD (&ep->queue);
1276
1277 ep_reset(NULL, ep);
b0bf5fbf
RB		 1278
1279 if (i == 0)
1280 ep->ep.caps.type_control = true;
1281 else
1282 ep->ep.caps.type_bulk = true;
1283
1284 ep->ep.caps.dir_in = true;
1285 ep->ep.caps.dir_out = true;
1da177e4
LT		 1286 }
1287
1288 dev->ep[0].reg_mode = NULL;
e117e742 1289 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, MAX_EP0_SIZE);
1da177e4
LT		 1290 list_del_init (&dev->ep[0].ep.ep_list);
1291}
1292
1293static void udc_reset(struct goku_udc *dev)
1294{
1295 struct goku_udc_regs __iomem *regs = dev->regs;
1296
1297 writel(0, &regs->power_detect);
1298 writel(0, &regs->int_enable);
1299 readl(&regs->int_enable);
1300 dev->int_enable = 0;
1301
1302 /* deassert reset, leave USB D+ at hi-Z (no pullup)
1303 * don't let INT_PWRDETECT sequence begin
1304 */
1305 udelay(250);
1306 writel(PW_RESETB, &regs->power_detect);
1307 readl(&regs->int_enable);
1308}
1309
1310static void ep0_start(struct goku_udc *dev)
1311{
1312 struct goku_udc_regs __iomem *regs = dev->regs;
1313 unsigned i;
1314
441b62c1 1315 VDBG(dev, "%s\n", __func__);
1da177e4
LT		 1316
1317 udc_reset(dev);
1318 udc_reinit (dev);
1319 //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1320
1321 /* hw handles set_address, set_feature, get_status; maybe more */
1322 writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1323 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1324 | G_REQMODE_GET_DESC
1325 | G_REQMODE_CLEAR_FEAT
1326 , &regs->reqmode);
1327
1328 for (i = 0; i < 4; i++)
1329 dev->ep[i].irqs = 0;
1330
1331 /* can't modify descriptors after writing UsbReady */
1332 for (i = 0; i < DESC_LEN; i++)
1333 writel(0, &regs->descriptors[i]);
1334 writel(0, &regs->UsbReady);
1335
1336 /* expect ep0 requests when the host drops reset */
1337 writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1338 dev->int_enable = INT_DEVWIDE | INT_EP0;
1339 writel(dev->int_enable, &dev->regs->int_enable);
1340 readl(&regs->int_enable);
1341 dev->gadget.speed = USB_SPEED_FULL;
1342 dev->ep0state = EP0_IDLE;
1343}
1344
1345static void udc_enable(struct goku_udc *dev)
1346{
1347 /* start enumeration now, or after power detect irq */
1348 if (readl(&dev->regs->power_detect) & PW_DETECT)
1349 ep0_start(dev);
1350 else {
441b62c1 1351 DBG(dev, "%s\n", __func__);
1da177e4
LT		 1352 dev->int_enable = INT_PWRDETECT;
1353 writel(dev->int_enable, &dev->regs->int_enable);
1354 }
1355}
1356
1357/*-------------------------------------------------------------------------*/
1358
1359/* keeping it simple:
1360 * - one bus driver, initted first;
1361 * - one function driver, initted second
1362 */
1363
1da177e4
LT		 1364/* when a driver is successfully registered, it will receive
1365 * control requests including set_configuration(), which enables
1366 * non-control requests. then usb traffic follows until a
1367 * disconnect is reported. then a host may connect again, or
1368 * the driver might get unbound.
1369 */
950b3c1d
FB		 1370static int goku_udc_start(struct usb_gadget *g,
1371 struct usb_gadget_driver *driver)
1da177e4 1372{
950b3c1d 1373 struct goku_udc *dev = to_goku_udc(g);
1da177e4
LT		 1374
1375 /* hook up the driver */
1376 driver->driver.bus = NULL;
1377 dev->driver = driver;
1da177e4 1378
950b3c1d
FB		 1379 /*
1380 * then enable host detection and ep0; and we're ready
1da177e4
LT		 1381 * for set_configuration as well as eventual disconnect.
1382 */
1383 udc_enable(dev);
1384
1da177e4
LT		 1385 return 0;
1386}
1da177e4 1387
4fbc5566 1388static void stop_activity(struct goku_udc *dev)
1da177e4
LT		 1389{
1390 unsigned i;
1391
441b62c1 1392 DBG (dev, "%s\n", __func__);
1da177e4 1393
1da177e4
LT		 1394 /* disconnect gadget driver after quiesceing hw and the driver */
1395 udc_reset (dev);
1396 for (i = 0; i < 4; i++)
1397 nuke(&dev->ep [i], -ESHUTDOWN);
1da177e4
LT		 1398
1399 if (dev->driver)
1400 udc_enable(dev);
1401}
1402
22835b80 1403static int goku_udc_stop(struct usb_gadget *g)
1da177e4 1404{
950b3c1d 1405 struct goku_udc *dev = to_goku_udc(g);
1da177e4
LT		 1406 unsigned long flags;
1407
1da177e4
LT		 1408 spin_lock_irqsave(&dev->lock, flags);
1409 dev->driver = NULL;
4fbc5566 1410 stop_activity(dev);
1da177e4 1411 spin_unlock_irqrestore(&dev->lock, flags);
1da177e4 1412
1da177e4
LT		 1413 return 0;
1414}
1da177e4
LT		 1415
1416/*-------------------------------------------------------------------------*/
1417
1418static void ep0_setup(struct goku_udc *dev)
1419{
1420 struct goku_udc_regs __iomem *regs = dev->regs;
1421 struct usb_ctrlrequest ctrl;
1422 int tmp;
1423
1424 /* read SETUP packet and enter DATA stage */
1425 ctrl.bRequestType = readl(&regs->bRequestType);
1426 ctrl.bRequest = readl(&regs->bRequest);
988199fe
DB		 1427 ctrl.wValue = cpu_to_le16((readl(&regs->wValueH) << 8)
1428 | readl(&regs->wValueL));
1429 ctrl.wIndex = cpu_to_le16((readl(&regs->wIndexH) << 8)
1430 | readl(&regs->wIndexL));
1431 ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1432 | readl(&regs->wLengthL));
1da177e4
LT		 1433 writel(0, &regs->SetupRecv);
1434
1435 nuke(&dev->ep[0], 0);
1436 dev->ep[0].stopped = 0;
1437 if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1438 dev->ep[0].is_in = 1;
1439 dev->ep0state = EP0_IN;
1440 /* detect early status stages */
1441 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1442 } else {
1443 dev->ep[0].is_in = 0;
1444 dev->ep0state = EP0_OUT;
1445
1446 /* NOTE: CLEAR_FEATURE is done in software so that we can
1447 * synchronize transfer restarts after bulk IN stalls. data
1448 * won't even enter the fifo until the halt is cleared.
1449 */
1450 switch (ctrl.bRequest) {
1451 case USB_REQ_CLEAR_FEATURE:
1452 switch (ctrl.bRequestType) {
1453 case USB_RECIP_ENDPOINT:
988199fe 1454 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1da177e4 1455 /* active endpoint */
db79d981
IS		 1456 if (tmp > 3 ||
1457 (!dev->ep[tmp].ep.desc && tmp != 0))
1da177e4 1458 goto stall;
551509d2 1459 if (ctrl.wIndex & cpu_to_le16(
988199fe 1460 USB_DIR_IN)) {
1da177e4
LT		 1461 if (!dev->ep[tmp].is_in)
1462 goto stall;
1463 } else {
1464 if (dev->ep[tmp].is_in)
1465 goto stall;
1466 }
551509d2 1467 if (ctrl.wValue != cpu_to_le16(
988199fe 1468 USB_ENDPOINT_HALT))
1da177e4
LT		 1469 goto stall;
1470 if (tmp)
1471 goku_clear_halt(&dev->ep[tmp]);
1472succeed:
1473 /* start ep0out status stage */
1474 writel(~(1<<0), &regs->EOP);
1475 dev->ep[0].stopped = 1;
1476 dev->ep0state = EP0_STATUS;
1477 return;
1478 case USB_RECIP_DEVICE:
1479 /* device remote wakeup: always clear */
551509d2 1480 if (ctrl.wValue != cpu_to_le16(1))
1da177e4
LT		 1481 goto stall;
1482 VDBG(dev, "clear dev remote wakeup\n");
1483 goto succeed;
1484 case USB_RECIP_INTERFACE:
1485 goto stall;
1486 default: /* pass to gadget driver */
1487 break;
1488 }
1489 break;
1490 default:
1491 break;
1492 }
1493 }
1494
1495#ifdef USB_TRACE
1496 VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1497 ctrl.bRequestType, ctrl.bRequest,
988199fe
DB		 1498 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1499 le16_to_cpu(ctrl.wLength));
1da177e4
LT		 1500#endif
1501
1502 /* hw wants to know when we're configured (or not) */
1503 dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1504 && ctrl.bRequestType == USB_RECIP_DEVICE);
1505 if (unlikely(dev->req_config))
551509d2 1506 dev->configured = (ctrl.wValue != cpu_to_le16(0));
1da177e4
LT		 1507
1508 /* delegate everything to the gadget driver.
1509 * it may respond after this irq handler returns.
1510 */
1511 spin_unlock (&dev->lock);
1512 tmp = dev->driver->setup(&dev->gadget, &ctrl);
1513 spin_lock (&dev->lock);
1514 if (unlikely(tmp < 0)) {
1515stall:
1516#ifdef USB_TRACE
1517 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1518 ctrl.bRequestType, ctrl.bRequest, tmp);
1519#endif
1520 command(regs, COMMAND_STALL, 0);
1521 dev->ep[0].stopped = 1;
1522 dev->ep0state = EP0_STALL;
1523 }
1524
1525 /* expect at least one data or status stage irq */
1526}
1527
1528#define ACK(irqbit) { \
1529 stat &= ~irqbit; \
1530 writel(~irqbit, &regs->int_status); \
1531 handled = 1; \
1532 }
1533
7d12e780 1534static irqreturn_t goku_irq(int irq, void *_dev)
1da177e4
LT		 1535{
1536 struct goku_udc *dev = _dev;
1537 struct goku_udc_regs __iomem *regs = dev->regs;
1538 struct goku_ep *ep;
1539 u32 stat, handled = 0;
1540 unsigned i, rescans = 5;
1541
1542 spin_lock(&dev->lock);
1543
1544rescan:
1545 stat = readl(&regs->int_status) & dev->int_enable;
1546 if (!stat)
1547 goto done;
1548 dev->irqs++;
1549
1550 /* device-wide irqs */
1551 if (unlikely(stat & INT_DEVWIDE)) {
1552 if (stat & INT_SYSERROR) {
1553 ERROR(dev, "system error\n");
4fbc5566 1554 stop_activity(dev);
1da177e4
LT		 1555 stat = 0;
1556 handled = 1;
1557 // FIXME have a neater way to prevent re-enumeration
1558 dev->driver = NULL;
1559 goto done;
1560 }
1561 if (stat & INT_PWRDETECT) {
1562 writel(~stat, &regs->int_status);
1563 if (readl(&dev->regs->power_detect) & PW_DETECT) {
1564 VDBG(dev, "connect\n");
1565 ep0_start(dev);
1566 } else {
1567 DBG(dev, "disconnect\n");
1568 if (dev->gadget.speed == USB_SPEED_FULL)
4fbc5566 1569 stop_activity(dev);
1da177e4
LT		 1570 dev->ep0state = EP0_DISCONNECT;
1571 dev->int_enable = INT_DEVWIDE;
1572 writel(dev->int_enable, &dev->regs->int_enable);
1573 }
1574 stat = 0;
1575 handled = 1;
1576 goto done;
1577 }
1578 if (stat & INT_SUSPEND) {
1579 ACK(INT_SUSPEND);
1580 if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1581 switch (dev->ep0state) {
1582 case EP0_DISCONNECT:
1583 case EP0_SUSPEND:
1584 goto pm_next;
1585 default:
1586 break;
1587 }
1588 DBG(dev, "USB suspend\n");
1589 dev->ep0state = EP0_SUSPEND;
1590 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1591 && dev->driver
1592 && dev->driver->suspend) {
1593 spin_unlock(&dev->lock);
1594 dev->driver->suspend(&dev->gadget);
1595 spin_lock(&dev->lock);
1596 }
1597 } else {
1598 if (dev->ep0state != EP0_SUSPEND) {
1599 DBG(dev, "bogus USB resume %d\n",
1600 dev->ep0state);
1601 goto pm_next;
1602 }
1603 DBG(dev, "USB resume\n");
1604 dev->ep0state = EP0_IDLE;
1605 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1606 && dev->driver
1607 && dev->driver->resume) {
1608 spin_unlock(&dev->lock);
1609 dev->driver->resume(&dev->gadget);
1610 spin_lock(&dev->lock);
1611 }
1612 }
1613 }
1614pm_next:
1615 if (stat & INT_USBRESET) { /* hub reset done */
1616 ACK(INT_USBRESET);
1617 INFO(dev, "USB reset done, gadget %s\n",
1618 dev->driver->driver.name);
1619 }
1620 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1621 }
1622
1623 /* progress ep0 setup, data, or status stages.
1624 * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1625 */
1626 if (stat & INT_SETUP) {
1627 ACK(INT_SETUP);
1628 dev->ep[0].irqs++;
1629 ep0_setup(dev);
1630 }
1631 if (stat & INT_STATUSNAK) {
1632 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1633 if (dev->ep0state == EP0_IN) {
1634 ep = &dev->ep[0];
1635 ep->irqs++;
1636 nuke(ep, 0);
1637 writel(~(1<<0), &regs->EOP);
1638 dev->ep0state = EP0_STATUS;
1639 }
1640 }
1641 if (stat & INT_ENDPOINT0) {
1642 ACK(INT_ENDPOINT0);
1643 ep = &dev->ep[0];
1644 ep->irqs++;
1645 pio_advance(ep);
1646 }
1647
1648 /* dma completion */
1649 if (stat & INT_MSTRDEND) { /* IN */
1650 ACK(INT_MSTRDEND);
1651 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1652 ep->irqs++;
1653 dma_advance(dev, ep);
1654 }
1655 if (stat & INT_MSTWREND) { /* OUT */
1656 ACK(INT_MSTWREND);
1657 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1658 ep->irqs++;
1659 dma_advance(dev, ep);
1660 }
1661 if (stat & INT_MSTWRTMOUT) { /* OUT */
1662 ACK(INT_MSTWRTMOUT);
1663 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1664 ep->irqs++;
1665 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1666 // reset dma? then dma_advance()
1667 }
1668
1669 /* pio */
1670 for (i = 1; i < 4; i++) {
1671 u32 tmp = INT_EPxDATASET(i);
1672
1673 if (!(stat & tmp))
1674 continue;
1675 ep = &dev->ep[i];
1676 pio_advance(ep);
1677 if (list_empty (&ep->queue))
1678 pio_irq_disable(dev, regs, i);
1679 stat &= ~tmp;
1680 handled = 1;
1681 ep->irqs++;
1682 }
1683
1684 if (rescans--)
1685 goto rescan;
1686
1687done:
1688 (void)readl(&regs->int_enable);
1689 spin_unlock(&dev->lock);
1690 if (stat)
1691 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1692 readl(&regs->int_status), dev->int_enable);
1693 return IRQ_RETVAL(handled);
1694}
1695
1696#undef ACK
1697
1698/*-------------------------------------------------------------------------*/
1699
1700static void gadget_release(struct device *_dev)
1701{
1702 struct goku_udc *dev = dev_get_drvdata(_dev);
1703
1704 kfree(dev);
1705}
1706
1707/* tear down the binding between this driver and the pci device */
1708
1709static void goku_remove(struct pci_dev *pdev)
1710{
1711 struct goku_udc *dev = pci_get_drvdata(pdev);
1712
441b62c1 1713 DBG(dev, "%s\n", __func__);
6bea476c 1714
0f91349b
SAS		 1715 usb_del_gadget_udc(&dev->gadget);
1716
6bea476c 1717 BUG_ON(dev->driver);
1da177e4
LT		 1718
1719#ifdef CONFIG_USB_GADGET_DEBUG_FILES
1720 remove_proc_entry(proc_node_name, NULL);
1721#endif
1722 if (dev->regs)
1723 udc_reset(dev);
1724 if (dev->got_irq)
1725 free_irq(pdev->irq, dev);
1726 if (dev->regs)
1727 iounmap(dev->regs);
1728 if (dev->got_region)
1729 release_mem_region(pci_resource_start (pdev, 0),
1730 pci_resource_len (pdev, 0));
1731 if (dev->enabled)
1732 pci_disable_device(pdev);
1da177e4 1733
1da177e4 1734 dev->regs = NULL;
1da177e4
LT		 1735
1736 INFO(dev, "unbind\n");
1737}
1738
1739/* wrap this driver around the specified pci device, but
1740 * don't respond over USB until a gadget driver binds to us.
1741 */
1742
1743static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1744{
1745 struct goku_udc *dev = NULL;
1746 unsigned long resource, len;
1747 void __iomem *base = NULL;
1748 int retval;
1da177e4 1749
1da177e4
LT		 1750 if (!pdev->irq) {
1751 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1752 retval = -ENODEV;
319feaab 1753 goto err;
1da177e4
LT		 1754 }
1755
1756 /* alloc, and start init */
dd00cc48 1757 dev = kzalloc (sizeof *dev, GFP_KERNEL);
1a7c1d58 1758 if (!dev) {
1da177e4 1759 retval = -ENOMEM;
319feaab 1760 goto err;
1da177e4
LT		 1761 }
1762
0d66e048 1763 pci_set_drvdata(pdev, dev);
1da177e4
LT		 1764 spin_lock_init(&dev->lock);
1765 dev->pdev = pdev;
1766 dev->gadget.ops = &goku_ops;
d327ab5b 1767 dev->gadget.max_speed = USB_SPEED_FULL;
1da177e4
LT		 1768
1769 /* the "gadget" abstracts/virtualizes the controller */
1da177e4
LT		 1770 dev->gadget.name = driver_name;
1771
1772 /* now all the pci goodies ... */
1773 retval = pci_enable_device(pdev);
1774 if (retval < 0) {
1775 DBG(dev, "can't enable, %d\n", retval);
319feaab 1776 goto err;
1da177e4
LT		 1777 }
1778 dev->enabled = 1;
1779
1780 resource = pci_resource_start(pdev, 0);
1781 len = pci_resource_len(pdev, 0);
1782 if (!request_mem_region(resource, len, driver_name)) {
1783 DBG(dev, "controller already in use\n");
1784 retval = -EBUSY;
319feaab 1785 goto err;
1da177e4
LT		 1786 }
1787 dev->got_region = 1;
1788
4bdc0d67 1789 base = ioremap(resource, len);
1da177e4
LT		 1790 if (base == NULL) {
1791 DBG(dev, "can't map memory\n");
1792 retval = -EFAULT;
319feaab 1793 goto err;
1da177e4
LT		 1794 }
1795 dev->regs = (struct goku_udc_regs __iomem *) base;
1796
1da177e4
LT		 1797 INFO(dev, "%s\n", driver_desc);
1798 INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
c6387a48 1799 INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1da177e4
LT		 1800
1801 /* init to known state, then setup irqs */
1802 udc_reset(dev);
1803 udc_reinit (dev);
11bc2683 1804 if (request_irq(pdev->irq, goku_irq, IRQF_SHARED,
1da177e4 1805 driver_name, dev) != 0) {
c6387a48 1806 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1da177e4 1807 retval = -EBUSY;
319feaab 1808 goto err;
1da177e4
LT		 1809 }
1810 dev->got_irq = 1;
1811 if (use_dma)
1812 pci_set_master(pdev);
1813
1814
1815#ifdef CONFIG_USB_GADGET_DEBUG_FILES
3f3942ac 1816 proc_create_single_data(proc_node_name, 0, NULL, udc_proc_read, dev);
1da177e4
LT		 1817#endif
1818
2ae837e4
FB		 1819 retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
1820 gadget_release);
0f91349b
SAS		 1821 if (retval)
1822 goto err;
1823
319feaab 1824 return 0;
1da177e4 1825
319feaab 1826err:
1da177e4
LT		 1827 if (dev)
1828 goku_remove (pdev);
2a334cfa
AK		 1829 /* gadget_release is not registered yet, kfree explicitly */
1830 kfree(dev);
1da177e4
LT		 1831 return retval;
1832}
1833
1834
1835/*-------------------------------------------------------------------------*/
1836
1ba2557f 1837static const struct pci_device_id pci_ids[] = { {
7b78f48a 1838 .class = PCI_CLASS_SERIAL_USB_DEVICE,
2d70c99b 1839 .class_mask = ~0,
1da177e4
LT		 1840 .vendor = 0x102f, /* Toshiba */
1841 .device = 0x0107, /* this UDC */
1842 .subvendor = PCI_ANY_ID,
1843 .subdevice = PCI_ANY_ID,
1844
1845}, { /* end: all zeroes */ }
1846};
1847MODULE_DEVICE_TABLE (pci, pci_ids);
1848
1849static struct pci_driver goku_pci_driver = {
37a757e3 1850 .name = driver_name,
1da177e4
LT		 1851 .id_table = pci_ids,
1852
1853 .probe = goku_probe,
1854 .remove = goku_remove,
1855
1856 /* FIXME add power management support */
1857};
1858
3cdb7721 1859module_pci_driver(goku_pci_driver);
Linux 6.x block layer and io_uring tree(s)