1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Driver for PLX NET2272 USB device controller
4 *
5 * Copyright (C) 2005-2006 PLX Technology, Inc.
6 * Copyright (C) 2006-2011 Analog Devices, Inc.
7 */
8
9 #include <linux/delay.h>
10 #include <linux/device.h>
11 #include <linux/errno.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/io.h>
15 #include <linux/ioport.h>
16 #include <linux/kernel.h>
17 #include <linux/list.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20 #include <linux/pci.h>
21 #include <linux/platform_device.h>
22 #include <linux/prefetch.h>
23 #include <linux/sched.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
26 #include <linux/usb.h>
27 #include <linux/usb/ch9.h>
28 #include <linux/usb/gadget.h>
29
30 #include <asm/byteorder.h>
31 #include <linux/unaligned.h>
32
33 #include "net2272.h"
34
35 #define DRIVER_DESC "PLX NET2272 USB Peripheral Controller"
36
37 static const char driver_name[] = "net2272";
38 static const char driver_vers[] = "2006 October 17/mainline";
39 static const char driver_desc[] = DRIVER_DESC;
40
41 static const char ep0name[] = "ep0";
42 static const char * const ep_name[] = {
43 ep0name,
44 "ep-a", "ep-b", "ep-c",
45 };
46
47 #ifdef CONFIG_USB_NET2272_DMA
48 /*
49 * use_dma: the NET2272 can use an external DMA controller.
50 * Note that since there is no generic DMA api, some functions,
51 * notably request_dma, start_dma, and cancel_dma will need to be
52 * modified for your platform's particular dma controller.
53 *
54 * If use_dma is disabled, pio will be used instead.
55 */
56 static bool use_dma = false;
57 module_param(use_dma, bool, 0644);
58
59 /*
60 * dma_ep: selects the endpoint for use with dma (1=ep-a, 2=ep-b)
61 * The NET2272 can only use dma for a single endpoint at a time.
62 * At some point this could be modified to allow either endpoint
63 * to take control of dma as it becomes available.
64 *
65 * Note that DMA should not be used on OUT endpoints unless it can
66 * be guaranteed that no short packets will arrive on an IN endpoint
67 * while the DMA operation is pending. Otherwise the OUT DMA will
68 * terminate prematurely (See NET2272 Errata 630-0213-0101)
69 */
70 static ushort dma_ep = 1;
71 module_param(dma_ep, ushort, 0644);
72
73 /*
74 * dma_mode: net2272 dma mode setting (see LOCCTL1 definition):
75 * mode 0 == Slow DREQ mode
76 * mode 1 == Fast DREQ mode
77 * mode 2 == Burst mode
78 */
79 static ushort dma_mode = 2;
80 module_param(dma_mode, ushort, 0644);
81 #else
82 #define use_dma 0
83 #define dma_ep 1
84 #define dma_mode 2
85 #endif
86
87 /*
88 * fifo_mode: net2272 buffer configuration:
89 * mode 0 == ep-{a,b,c} 512db each
90 * mode 1 == ep-a 1k, ep-{b,c} 512db
91 * mode 2 == ep-a 1k, ep-b 1k, ep-c 512db
92 * mode 3 == ep-a 1k, ep-b disabled, ep-c 512db
93 */
94 static ushort fifo_mode;
95 module_param(fifo_mode, ushort, 0644);
96
97 /*
98 * enable_suspend: When enabled, the driver will respond to
99 * USB suspend requests by powering down the NET2272. Otherwise,
100 * USB suspend requests will be ignored. This is acceptable for
101 * self-powered devices. For bus powered devices set this to 1.
102 */
103 static ushort enable_suspend;
104 module_param(enable_suspend, ushort, 0644);
105
assert_out_naking(struct net2272_ep * ep,const char * where)106 static void assert_out_naking(struct net2272_ep *ep, const char *where)
107 {
108 u8 tmp;
109
110 #ifndef DEBUG
111 return;
112 #endif
113
114 tmp = net2272_ep_read(ep, EP_STAT0);
115 if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) {
116 dev_dbg(ep->dev->dev, "%s %s %02x !NAK\n",
117 ep->ep.name, where, tmp);
118 net2272_ep_write(ep, EP_RSPSET, 1 << ALT_NAK_OUT_PACKETS);
119 }
120 }
121 #define ASSERT_OUT_NAKING(ep) assert_out_naking(ep, __func__)
122
stop_out_naking(struct net2272_ep * ep)123 static void stop_out_naking(struct net2272_ep *ep)
124 {
125 u8 tmp = net2272_ep_read(ep, EP_STAT0);
126
127 if ((tmp & (1 << NAK_OUT_PACKETS)) != 0)
128 net2272_ep_write(ep, EP_RSPCLR, 1 << ALT_NAK_OUT_PACKETS);
129 }
130
131 #define PIPEDIR(bAddress) (usb_pipein(bAddress) ? "in" : "out")
132
type_string(u8 bmAttributes)133 static char *type_string(u8 bmAttributes)
134 {
135 switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
136 case USB_ENDPOINT_XFER_BULK: return "bulk";
137 case USB_ENDPOINT_XFER_ISOC: return "iso";
138 case USB_ENDPOINT_XFER_INT: return "intr";
139 default: return "control";
140 }
141 }
142
buf_state_string(unsigned state)143 static char *buf_state_string(unsigned state)
144 {
145 switch (state) {
146 case BUFF_FREE: return "free";
147 case BUFF_VALID: return "valid";
148 case BUFF_LCL: return "local";
149 case BUFF_USB: return "usb";
150 default: return "unknown";
151 }
152 }
153
dma_mode_string(void)154 static char *dma_mode_string(void)
155 {
156 if (!use_dma)
157 return "PIO";
158 switch (dma_mode) {
159 case 0: return "SLOW DREQ";
160 case 1: return "FAST DREQ";
161 case 2: return "BURST";
162 default: return "invalid";
163 }
164 }
165
166 static void net2272_dequeue_all(struct net2272_ep *);
167 static int net2272_kick_dma(struct net2272_ep *, struct net2272_request *);
168 static int net2272_fifo_status(struct usb_ep *);
169
170 static const struct usb_ep_ops net2272_ep_ops;
171
172 /*---------------------------------------------------------------------------*/
173
174 static int
net2272_enable(struct usb_ep * _ep,const struct usb_endpoint_descriptor * desc)175 net2272_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
176 {
177 struct net2272 *dev;
178 struct net2272_ep *ep;
179 u32 max;
180 u8 tmp;
181 unsigned long flags;
182
183 ep = container_of(_ep, struct net2272_ep, ep);
184 if (!_ep || !desc || ep->desc || _ep->name == ep0name
185 || desc->bDescriptorType != USB_DT_ENDPOINT)
186 return -EINVAL;
187 dev = ep->dev;
188 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
189 return -ESHUTDOWN;
190
191 max = usb_endpoint_maxp(desc);
192
193 spin_lock_irqsave(&dev->lock, flags);
194 _ep->maxpacket = max;
195 ep->desc = desc;
196
197 /* net2272_ep_reset() has already been called */
198 ep->stopped = 0;
199 ep->wedged = 0;
200
201 /* set speed-dependent max packet */
202 net2272_ep_write(ep, EP_MAXPKT0, max & 0xff);
203 net2272_ep_write(ep, EP_MAXPKT1, (max & 0xff00) >> 8);
204
205 /* set type, direction, address; reset fifo counters */
206 net2272_ep_write(ep, EP_STAT1, 1 << BUFFER_FLUSH);
207 tmp = usb_endpoint_type(desc);
208 if (usb_endpoint_xfer_bulk(desc)) {
209 /* catch some particularly blatant driver bugs */
210 if ((dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
211 (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
212 spin_unlock_irqrestore(&dev->lock, flags);
213 return -ERANGE;
214 }
215 }
216 ep->is_iso = usb_endpoint_xfer_isoc(desc) ? 1 : 0;
217 tmp <<= ENDPOINT_TYPE;
218 tmp |= ((desc->bEndpointAddress & 0x0f) << ENDPOINT_NUMBER);
219 tmp |= usb_endpoint_dir_in(desc) << ENDPOINT_DIRECTION;
220 tmp |= (1 << ENDPOINT_ENABLE);
221
222 /* for OUT transfers, block the rx fifo until a read is posted */
223 ep->is_in = usb_endpoint_dir_in(desc);
224 if (!ep->is_in)
225 net2272_ep_write(ep, EP_RSPSET, 1 << ALT_NAK_OUT_PACKETS);
226
227 net2272_ep_write(ep, EP_CFG, tmp);
228
229 /* enable irqs */
230 tmp = (1 << ep->num) | net2272_read(dev, IRQENB0);
231 net2272_write(dev, IRQENB0, tmp);
232
233 tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
234 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE)
235 | net2272_ep_read(ep, EP_IRQENB);
236 net2272_ep_write(ep, EP_IRQENB, tmp);
237
238 tmp = desc->bEndpointAddress;
239 dev_dbg(dev->dev, "enabled %s (ep%d%s-%s) max %04x cfg %02x\n",
240 _ep->name, tmp & 0x0f, PIPEDIR(tmp),
241 type_string(desc->bmAttributes), max,
242 net2272_ep_read(ep, EP_CFG));
243
244 spin_unlock_irqrestore(&dev->lock, flags);
245 return 0;
246 }
247
net2272_ep_reset(struct net2272_ep * ep)248 static void net2272_ep_reset(struct net2272_ep *ep)
249 {
250 u8 tmp;
251
252 ep->desc = NULL;
253 INIT_LIST_HEAD(&ep->queue);
254
255 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
256 ep->ep.ops = &net2272_ep_ops;
257
258 /* disable irqs, endpoint */
259 net2272_ep_write(ep, EP_IRQENB, 0);
260
261 /* init to our chosen defaults, notably so that we NAK OUT
262 * packets until the driver queues a read.
263 */
264 tmp = (1 << NAK_OUT_PACKETS_MODE) | (1 << ALT_NAK_OUT_PACKETS);
265 net2272_ep_write(ep, EP_RSPSET, tmp);
266
267 tmp = (1 << INTERRUPT_MODE) | (1 << HIDE_STATUS_PHASE);
268 if (ep->num != 0)
269 tmp |= (1 << ENDPOINT_TOGGLE) | (1 << ENDPOINT_HALT);
270
271 net2272_ep_write(ep, EP_RSPCLR, tmp);
272
273 /* scrub most status bits, and flush any fifo state */
274 net2272_ep_write(ep, EP_STAT0,
275 (1 << DATA_IN_TOKEN_INTERRUPT)
276 | (1 << DATA_OUT_TOKEN_INTERRUPT)
277 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
278 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
279 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT));
280
281 net2272_ep_write(ep, EP_STAT1,
282 (1 << TIMEOUT)
283 | (1 << USB_OUT_ACK_SENT)
284 | (1 << USB_OUT_NAK_SENT)
285 | (1 << USB_IN_ACK_RCVD)
286 | (1 << USB_IN_NAK_SENT)
287 | (1 << USB_STALL_SENT)
288 | (1 << LOCAL_OUT_ZLP)
289 | (1 << BUFFER_FLUSH));
290
291 /* fifo size is handled separately */
292 }
293
net2272_disable(struct usb_ep * _ep)294 static int net2272_disable(struct usb_ep *_ep)
295 {
296 struct net2272_ep *ep;
297 unsigned long flags;
298
299 ep = container_of(_ep, struct net2272_ep, ep);
300 if (!_ep || !ep->desc || _ep->name == ep0name)
301 return -EINVAL;
302
303 spin_lock_irqsave(&ep->dev->lock, flags);
304 net2272_dequeue_all(ep);
305 net2272_ep_reset(ep);
306
307 dev_vdbg(ep->dev->dev, "disabled %s\n", _ep->name);
308
309 spin_unlock_irqrestore(&ep->dev->lock, flags);
310 return 0;
311 }
312
313 /*---------------------------------------------------------------------------*/
314
315 static struct usb_request *
net2272_alloc_request(struct usb_ep * _ep,gfp_t gfp_flags)316 net2272_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
317 {
318 struct net2272_request *req;
319
320 if (!_ep)
321 return NULL;
322
323 req = kzalloc(sizeof(*req), gfp_flags);
324 if (!req)
325 return NULL;
326
327 INIT_LIST_HEAD(&req->queue);
328
329 return &req->req;
330 }
331
332 static void
net2272_free_request(struct usb_ep * _ep,struct usb_request * _req)333 net2272_free_request(struct usb_ep *_ep, struct usb_request *_req)
334 {
335 struct net2272_request *req;
336
337 if (!_ep || !_req)
338 return;
339
340 req = container_of(_req, struct net2272_request, req);
341 WARN_ON(!list_empty(&req->queue));
342 kfree(req);
343 }
344
345 static void
net2272_done(struct net2272_ep * ep,struct net2272_request * req,int status)346 net2272_done(struct net2272_ep *ep, struct net2272_request *req, int status)
347 {
348 struct net2272 *dev;
349 unsigned stopped = ep->stopped;
350
351 if (ep->num == 0) {
352 if (ep->dev->protocol_stall) {
353 ep->stopped = 1;
354 set_halt(ep);
355 }
356 allow_status(ep);
357 }
358
359 list_del_init(&req->queue);
360
361 if (req->req.status == -EINPROGRESS)
362 req->req.status = status;
363 else
364 status = req->req.status;
365
366 dev = ep->dev;
367 if (use_dma && ep->dma)
368 usb_gadget_unmap_request(&dev->gadget, &req->req,
369 ep->is_in);
370
371 if (status && status != -ESHUTDOWN)
372 dev_vdbg(dev->dev, "complete %s req %p stat %d len %u/%u buf %p\n",
373 ep->ep.name, &req->req, status,
374 req->req.actual, req->req.length, req->req.buf);
375
376 /* don't modify queue heads during completion callback */
377 ep->stopped = 1;
378 spin_unlock(&dev->lock);
379 usb_gadget_giveback_request(&ep->ep, &req->req);
380 spin_lock(&dev->lock);
381 ep->stopped = stopped;
382 }
383
384 static int
net2272_write_packet(struct net2272_ep * ep,u8 * buf,struct net2272_request * req,unsigned max)385 net2272_write_packet(struct net2272_ep *ep, u8 *buf,
386 struct net2272_request *req, unsigned max)
387 {
388 u16 __iomem *ep_data = net2272_reg_addr(ep->dev, EP_DATA);
389 u16 *bufp;
390 unsigned length, count;
391 u8 tmp;
392
393 length = min(req->req.length - req->req.actual, max);
394 req->req.actual += length;
395
396 dev_vdbg(ep->dev->dev, "write packet %s req %p max %u len %u avail %u\n",
397 ep->ep.name, req, max, length,
398 (net2272_ep_read(ep, EP_AVAIL1) << 8) | net2272_ep_read(ep, EP_AVAIL0));
399
400 count = length;
401 bufp = (u16 *)buf;
402
403 while (likely(count >= 2)) {
404 /* no byte-swap required; chip endian set during init */
405 writew(*bufp++, ep_data);
406 count -= 2;
407 }
408 buf = (u8 *)bufp;
409
410 /* write final byte by placing the NET2272 into 8-bit mode */
411 if (unlikely(count)) {
412 tmp = net2272_read(ep->dev, LOCCTL);
413 net2272_write(ep->dev, LOCCTL, tmp & ~(1 << DATA_WIDTH));
414 writeb(*buf, ep_data);
415 net2272_write(ep->dev, LOCCTL, tmp);
416 }
417 return length;
418 }
419
420 /* returns: 0: still running, 1: completed, negative: errno */
421 static int
net2272_write_fifo(struct net2272_ep * ep,struct net2272_request * req)422 net2272_write_fifo(struct net2272_ep *ep, struct net2272_request *req)
423 {
424 u8 *buf;
425 unsigned count, max;
426 int status;
427
428 dev_vdbg(ep->dev->dev, "write_fifo %s actual %d len %d\n",
429 ep->ep.name, req->req.actual, req->req.length);
430
431 /*
432 * Keep loading the endpoint until the final packet is loaded,
433 * or the endpoint buffer is full.
434 */
435 top:
436 /*
437 * Clear interrupt status
438 * - Packet Transmitted interrupt will become set again when the
439 * host successfully takes another packet
440 */
441 net2272_ep_write(ep, EP_STAT0, (1 << DATA_PACKET_TRANSMITTED_INTERRUPT));
442 while (!(net2272_ep_read(ep, EP_STAT0) & (1 << BUFFER_FULL))) {
443 buf = req->req.buf + req->req.actual;
444 prefetch(buf);
445
446 /* force pagesel */
447 net2272_ep_read(ep, EP_STAT0);
448
449 max = (net2272_ep_read(ep, EP_AVAIL1) << 8) |
450 (net2272_ep_read(ep, EP_AVAIL0));
451
452 if (max < ep->ep.maxpacket)
453 max = (net2272_ep_read(ep, EP_AVAIL1) << 8)
454 | (net2272_ep_read(ep, EP_AVAIL0));
455
456 count = net2272_write_packet(ep, buf, req, max);
457 /* see if we are done */
458 if (req->req.length == req->req.actual) {
459 /* validate short or zlp packet */
460 if (count < ep->ep.maxpacket)
461 set_fifo_bytecount(ep, 0);
462 net2272_done(ep, req, 0);
463
464 if (!list_empty(&ep->queue)) {
465 req = list_entry(ep->queue.next,
466 struct net2272_request,
467 queue);
468 status = net2272_kick_dma(ep, req);
469
470 if (status < 0)
471 if ((net2272_ep_read(ep, EP_STAT0)
472 & (1 << BUFFER_EMPTY)))
473 goto top;
474 }
475 return 1;
476 }
477 net2272_ep_write(ep, EP_STAT0, (1 << DATA_PACKET_TRANSMITTED_INTERRUPT));
478 }
479 return 0;
480 }
481
482 static void
net2272_out_flush(struct net2272_ep * ep)483 net2272_out_flush(struct net2272_ep *ep)
484 {
485 ASSERT_OUT_NAKING(ep);
486
487 net2272_ep_write(ep, EP_STAT0, (1 << DATA_OUT_TOKEN_INTERRUPT)
488 | (1 << DATA_PACKET_RECEIVED_INTERRUPT));
489 net2272_ep_write(ep, EP_STAT1, 1 << BUFFER_FLUSH);
490 }
491
492 static int
net2272_read_packet(struct net2272_ep * ep,u8 * buf,struct net2272_request * req,unsigned avail)493 net2272_read_packet(struct net2272_ep *ep, u8 *buf,
494 struct net2272_request *req, unsigned avail)
495 {
496 u16 __iomem *ep_data = net2272_reg_addr(ep->dev, EP_DATA);
497 unsigned is_short;
498 u16 *bufp;
499
500 req->req.actual += avail;
501
502 dev_vdbg(ep->dev->dev, "read packet %s req %p len %u avail %u\n",
503 ep->ep.name, req, avail,
504 (net2272_ep_read(ep, EP_AVAIL1) << 8) | net2272_ep_read(ep, EP_AVAIL0));
505
506 is_short = (avail < ep->ep.maxpacket);
507
508 if (unlikely(avail == 0)) {
509 /* remove any zlp from the buffer */
510 (void)readw(ep_data);
511 return is_short;
512 }
513
514 /* Ensure we get the final byte */
515 if (unlikely(avail % 2))
516 avail++;
517 bufp = (u16 *)buf;
518
519 do {
520 *bufp++ = readw(ep_data);
521 avail -= 2;
522 } while (avail);
523
524 /*
525 * To avoid false endpoint available race condition must read
526 * ep stat0 twice in the case of a short transfer
527 */
528 if (net2272_ep_read(ep, EP_STAT0) & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT))
529 net2272_ep_read(ep, EP_STAT0);
530
531 return is_short;
532 }
533
534 static int
net2272_read_fifo(struct net2272_ep * ep,struct net2272_request * req)535 net2272_read_fifo(struct net2272_ep *ep, struct net2272_request *req)
536 {
537 u8 *buf;
538 unsigned is_short;
539 int count;
540 int tmp;
541 int cleanup = 0;
542
543 dev_vdbg(ep->dev->dev, "read_fifo %s actual %d len %d\n",
544 ep->ep.name, req->req.actual, req->req.length);
545
546 top:
547 do {
548 buf = req->req.buf + req->req.actual;
549 prefetchw(buf);
550
551 count = (net2272_ep_read(ep, EP_AVAIL1) << 8)
552 | net2272_ep_read(ep, EP_AVAIL0);
553
554 net2272_ep_write(ep, EP_STAT0,
555 (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) |
556 (1 << DATA_PACKET_RECEIVED_INTERRUPT));
557
558 tmp = req->req.length - req->req.actual;
559
560 if (count > tmp) {
561 if ((tmp % ep->ep.maxpacket) != 0) {
562 dev_err(ep->dev->dev,
563 "%s out fifo %d bytes, expected %d\n",
564 ep->ep.name, count, tmp);
565 cleanup = 1;
566 }
567 count = (tmp > 0) ? tmp : 0;
568 }
569
570 is_short = net2272_read_packet(ep, buf, req, count);
571
572 /* completion */
573 if (unlikely(cleanup || is_short ||
574 req->req.actual == req->req.length)) {
575
576 if (cleanup) {
577 net2272_out_flush(ep);
578 net2272_done(ep, req, -EOVERFLOW);
579 } else
580 net2272_done(ep, req, 0);
581
582 /* re-initialize endpoint transfer registers
583 * otherwise they may result in erroneous pre-validation
584 * for subsequent control reads
585 */
586 if (unlikely(ep->num == 0)) {
587 net2272_ep_write(ep, EP_TRANSFER2, 0);
588 net2272_ep_write(ep, EP_TRANSFER1, 0);
589 net2272_ep_write(ep, EP_TRANSFER0, 0);
590 }
591
592 if (!list_empty(&ep->queue)) {
593 int status;
594
595 req = list_entry(ep->queue.next,
596 struct net2272_request, queue);
597 status = net2272_kick_dma(ep, req);
598 if ((status < 0) &&
599 !(net2272_ep_read(ep, EP_STAT0) & (1 << BUFFER_EMPTY)))
600 goto top;
601 }
602 return 1;
603 }
604 } while (!(net2272_ep_read(ep, EP_STAT0) & (1 << BUFFER_EMPTY)));
605
606 return 0;
607 }
608
609 static void
net2272_pio_advance(struct net2272_ep * ep)610 net2272_pio_advance(struct net2272_ep *ep)
611 {
612 struct net2272_request *req;
613
614 if (unlikely(list_empty(&ep->queue)))
615 return;
616
617 req = list_entry(ep->queue.next, struct net2272_request, queue);
618 (ep->is_in ? net2272_write_fifo : net2272_read_fifo)(ep, req);
619 }
620
621 /* returns 0 on success, else negative errno */
622 static int
net2272_request_dma(struct net2272 * dev,unsigned ep,u32 buf,unsigned len,unsigned dir)623 net2272_request_dma(struct net2272 *dev, unsigned ep, u32 buf,
624 unsigned len, unsigned dir)
625 {
626 dev_vdbg(dev->dev, "request_dma ep %d buf %08x len %d dir %d\n",
627 ep, buf, len, dir);
628
629 /* The NET2272 only supports a single dma channel */
630 if (dev->dma_busy)
631 return -EBUSY;
632 /*
633 * EP_TRANSFER (used to determine the number of bytes received
634 * in an OUT transfer) is 24 bits wide; don't ask for more than that.
635 */
636 if ((dir == 1) && (len > 0x1000000))
637 return -EINVAL;
638
639 dev->dma_busy = 1;
640
641 /* initialize platform's dma */
642 #ifdef CONFIG_USB_PCI
643 /* NET2272 addr, buffer addr, length, etc. */
644 switch (dev->dev_id) {
645 case PCI_DEVICE_ID_RDK1:
646 /* Setup PLX 9054 DMA mode */
647 writel((1 << LOCAL_BUS_WIDTH) |
648 (1 << TA_READY_INPUT_ENABLE) |
649 (0 << LOCAL_BURST_ENABLE) |
650 (1 << DONE_INTERRUPT_ENABLE) |
651 (1 << LOCAL_ADDRESSING_MODE) |
652 (1 << DEMAND_MODE) |
653 (1 << DMA_EOT_ENABLE) |
654 (1 << FAST_SLOW_TERMINATE_MODE_SELECT) |
655 (1 << DMA_CHANNEL_INTERRUPT_SELECT),
656 dev->rdk1.plx9054_base_addr + DMAMODE0);
657
658 writel(0x100000, dev->rdk1.plx9054_base_addr + DMALADR0);
659 writel(buf, dev->rdk1.plx9054_base_addr + DMAPADR0);
660 writel(len, dev->rdk1.plx9054_base_addr + DMASIZ0);
661 writel((dir << DIRECTION_OF_TRANSFER) |
662 (1 << INTERRUPT_AFTER_TERMINAL_COUNT),
663 dev->rdk1.plx9054_base_addr + DMADPR0);
664 writel((1 << LOCAL_DMA_CHANNEL_0_INTERRUPT_ENABLE) |
665 readl(dev->rdk1.plx9054_base_addr + INTCSR),
666 dev->rdk1.plx9054_base_addr + INTCSR);
667
668 break;
669 }
670 #endif
671
672 net2272_write(dev, DMAREQ,
673 (0 << DMA_BUFFER_VALID) |
674 (1 << DMA_REQUEST_ENABLE) |
675 (1 << DMA_CONTROL_DACK) |
676 (dev->dma_eot_polarity << EOT_POLARITY) |
677 (dev->dma_dack_polarity << DACK_POLARITY) |
678 (dev->dma_dreq_polarity << DREQ_POLARITY) |
679 ((ep >> 1) << DMA_ENDPOINT_SELECT));
680
681 (void) net2272_read(dev, SCRATCH);
682
683 return 0;
684 }
685
686 static void
net2272_start_dma(struct net2272 * dev)687 net2272_start_dma(struct net2272 *dev)
688 {
689 /* start platform's dma controller */
690 #ifdef CONFIG_USB_PCI
691 switch (dev->dev_id) {
692 case PCI_DEVICE_ID_RDK1:
693 writeb((1 << CHANNEL_ENABLE) | (1 << CHANNEL_START),
694 dev->rdk1.plx9054_base_addr + DMACSR0);
695 break;
696 }
697 #endif
698 }
699
700 /* returns 0 on success, else negative errno */
701 static int
net2272_kick_dma(struct net2272_ep * ep,struct net2272_request * req)702 net2272_kick_dma(struct net2272_ep *ep, struct net2272_request *req)
703 {
704 unsigned size;
705 u8 tmp;
706
707 if (!use_dma || (ep->num < 1) || (ep->num > 2) || !ep->dma)
708 return -EINVAL;
709
710 /* don't use dma for odd-length transfers
711 * otherwise, we'd need to deal with the last byte with pio
712 */
713 if (req->req.length & 1)
714 return -EINVAL;
715
716 dev_vdbg(ep->dev->dev, "kick_dma %s req %p dma %08llx\n",
717 ep->ep.name, req, (unsigned long long) req->req.dma);
718
719 net2272_ep_write(ep, EP_RSPSET, 1 << ALT_NAK_OUT_PACKETS);
720
721 /* The NET2272 can only use DMA on one endpoint at a time */
722 if (ep->dev->dma_busy)
723 return -EBUSY;
724
725 /* Make sure we only DMA an even number of bytes (we'll use
726 * pio to complete the transfer)
727 */
728 size = req->req.length;
729 size &= ~1;
730
731 /* device-to-host transfer */
732 if (ep->is_in) {
733 /* initialize platform's dma controller */
734 if (net2272_request_dma(ep->dev, ep->num, req->req.dma, size, 0))
735 /* unable to obtain DMA channel; return error and use pio mode */
736 return -EBUSY;
737 req->req.actual += size;
738
739 /* host-to-device transfer */
740 } else {
741 tmp = net2272_ep_read(ep, EP_STAT0);
742
743 /* initialize platform's dma controller */
744 if (net2272_request_dma(ep->dev, ep->num, req->req.dma, size, 1))
745 /* unable to obtain DMA channel; return error and use pio mode */
746 return -EBUSY;
747
748 if (!(tmp & (1 << BUFFER_EMPTY)))
749 ep->not_empty = 1;
750 else
751 ep->not_empty = 0;
752
753
754 /* allow the endpoint's buffer to fill */
755 net2272_ep_write(ep, EP_RSPCLR, 1 << ALT_NAK_OUT_PACKETS);
756
757 /* this transfer completed and data's already in the fifo
758 * return error so pio gets used.
759 */
760 if (tmp & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
761
762 /* deassert dreq */
763 net2272_write(ep->dev, DMAREQ,
764 (0 << DMA_BUFFER_VALID) |
765 (0 << DMA_REQUEST_ENABLE) |
766 (1 << DMA_CONTROL_DACK) |
767 (ep->dev->dma_eot_polarity << EOT_POLARITY) |
768 (ep->dev->dma_dack_polarity << DACK_POLARITY) |
769 (ep->dev->dma_dreq_polarity << DREQ_POLARITY) |
770 ((ep->num >> 1) << DMA_ENDPOINT_SELECT));
771
772 return -EBUSY;
773 }
774 }
775
776 /* Don't use per-packet interrupts: use dma interrupts only */
777 net2272_ep_write(ep, EP_IRQENB, 0);
778
779 net2272_start_dma(ep->dev);
780
781 return 0;
782 }
783
net2272_cancel_dma(struct net2272 * dev)784 static void net2272_cancel_dma(struct net2272 *dev)
785 {
786 #ifdef CONFIG_USB_PCI
787 switch (dev->dev_id) {
788 case PCI_DEVICE_ID_RDK1:
789 writeb(0, dev->rdk1.plx9054_base_addr + DMACSR0);
790 writeb(1 << CHANNEL_ABORT, dev->rdk1.plx9054_base_addr + DMACSR0);
791 while (!(readb(dev->rdk1.plx9054_base_addr + DMACSR0) &
792 (1 << CHANNEL_DONE)))
793 continue; /* wait for dma to stabalize */
794
795 /* dma abort generates an interrupt */
796 writeb(1 << CHANNEL_CLEAR_INTERRUPT,
797 dev->rdk1.plx9054_base_addr + DMACSR0);
798 break;
799 }
800 #endif
801
802 dev->dma_busy = 0;
803 }
804
805 /*---------------------------------------------------------------------------*/
806
807 static int
net2272_queue(struct usb_ep * _ep,struct usb_request * _req,gfp_t gfp_flags)808 net2272_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
809 {
810 struct net2272_request *req;
811 struct net2272_ep *ep;
812 struct net2272 *dev;
813 unsigned long flags;
814 int status = -1;
815 u8 s;
816
817 req = container_of(_req, struct net2272_request, req);
818 if (!_req || !_req->complete || !_req->buf
819 || !list_empty(&req->queue))
820 return -EINVAL;
821 ep = container_of(_ep, struct net2272_ep, ep);
822 if (!_ep || (!ep->desc && ep->num != 0))
823 return -EINVAL;
824 dev = ep->dev;
825 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
826 return -ESHUTDOWN;
827
828 /* set up dma mapping in case the caller didn't */
829 if (use_dma && ep->dma) {
830 status = usb_gadget_map_request(&dev->gadget, _req,
831 ep->is_in);
832 if (status)
833 return status;
834 }
835
836 dev_vdbg(dev->dev, "%s queue req %p, len %d buf %p dma %08llx %s\n",
837 _ep->name, _req, _req->length, _req->buf,
838 (unsigned long long) _req->dma, _req->zero ? "zero" : "!zero");
839
840 spin_lock_irqsave(&dev->lock, flags);
841
842 _req->status = -EINPROGRESS;
843 _req->actual = 0;
844
845 /* kickstart this i/o queue? */
846 if (list_empty(&ep->queue) && !ep->stopped) {
847 /* maybe there's no control data, just status ack */
848 if (ep->num == 0 && _req->length == 0) {
849 net2272_done(ep, req, 0);
850 dev_vdbg(dev->dev, "%s status ack\n", ep->ep.name);
851 goto done;
852 }
853
854 /* Return zlp, don't let it block subsequent packets */
855 s = net2272_ep_read(ep, EP_STAT0);
856 if (s & (1 << BUFFER_EMPTY)) {
857 /* Buffer is empty check for a blocking zlp, handle it */
858 if ((s & (1 << NAK_OUT_PACKETS)) &&
859 net2272_ep_read(ep, EP_STAT1) & (1 << LOCAL_OUT_ZLP)) {
860 dev_dbg(dev->dev, "WARNING: returning ZLP short packet termination!\n");
861 /*
862 * Request is going to terminate with a short packet ...
863 * hope the client is ready for it!
864 */
865 status = net2272_read_fifo(ep, req);
866 /* clear short packet naking */
867 net2272_ep_write(ep, EP_STAT0, (1 << NAK_OUT_PACKETS));
868 goto done;
869 }
870 }
871
872 /* try dma first */
873 status = net2272_kick_dma(ep, req);
874
875 if (status < 0) {
876 /* dma failed (most likely in use by another endpoint)
877 * fallback to pio
878 */
879 status = 0;
880
881 if (ep->is_in)
882 status = net2272_write_fifo(ep, req);
883 else {
884 s = net2272_ep_read(ep, EP_STAT0);
885 if ((s & (1 << BUFFER_EMPTY)) == 0)
886 status = net2272_read_fifo(ep, req);
887 }
888
889 if (unlikely(status != 0)) {
890 if (status > 0)
891 status = 0;
892 req = NULL;
893 }
894 }
895 }
896 if (likely(req))
897 list_add_tail(&req->queue, &ep->queue);
898
899 if (likely(!list_empty(&ep->queue)))
900 net2272_ep_write(ep, EP_RSPCLR, 1 << ALT_NAK_OUT_PACKETS);
901 done:
902 spin_unlock_irqrestore(&dev->lock, flags);
903
904 return 0;
905 }
906
907 /* dequeue ALL requests */
908 static void
net2272_dequeue_all(struct net2272_ep * ep)909 net2272_dequeue_all(struct net2272_ep *ep)
910 {
911 struct net2272_request *req;
912
913 /* called with spinlock held */
914 ep->stopped = 1;
915
916 while (!list_empty(&ep->queue)) {
917 req = list_entry(ep->queue.next,
918 struct net2272_request,
919 queue);
920 net2272_done(ep, req, -ESHUTDOWN);
921 }
922 }
923
924 /* dequeue JUST ONE request */
925 static int
net2272_dequeue(struct usb_ep * _ep,struct usb_request * _req)926 net2272_dequeue(struct usb_ep *_ep, struct usb_request *_req)
927 {
928 struct net2272_ep *ep;
929 struct net2272_request *req = NULL, *iter;
930 unsigned long flags;
931 int stopped;
932
933 ep = container_of(_ep, struct net2272_ep, ep);
934 if (!_ep || (!ep->desc && ep->num != 0) || !_req)
935 return -EINVAL;
936
937 spin_lock_irqsave(&ep->dev->lock, flags);
938 stopped = ep->stopped;
939 ep->stopped = 1;
940
941 /* make sure it's still queued on this endpoint */
942 list_for_each_entry(iter, &ep->queue, queue) {
943 if (&iter->req != _req)
944 continue;
945 req = iter;
946 break;
947 }
948 if (!req) {
949 ep->stopped = stopped;
950 spin_unlock_irqrestore(&ep->dev->lock, flags);
951 return -EINVAL;
952 }
953
954 /* queue head may be partially complete */
955 if (ep->queue.next == &req->queue) {
956 dev_dbg(ep->dev->dev, "unlink (%s) pio\n", _ep->name);
957 net2272_done(ep, req, -ECONNRESET);
958 }
959 ep->stopped = stopped;
960
961 spin_unlock_irqrestore(&ep->dev->lock, flags);
962 return 0;
963 }
964
965 /*---------------------------------------------------------------------------*/
966
967 static int
net2272_set_halt_and_wedge(struct usb_ep * _ep,int value,int wedged)968 net2272_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
969 {
970 struct net2272_ep *ep;
971 unsigned long flags;
972 int ret = 0;
973
974 ep = container_of(_ep, struct net2272_ep, ep);
975 if (!_ep || (!ep->desc && ep->num != 0))
976 return -EINVAL;
977 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
978 return -ESHUTDOWN;
979 if (ep->desc /* not ep0 */ && usb_endpoint_xfer_isoc(ep->desc))
980 return -EINVAL;
981
982 spin_lock_irqsave(&ep->dev->lock, flags);
983 if (!list_empty(&ep->queue))
984 ret = -EAGAIN;
985 else if (ep->is_in && value && net2272_fifo_status(_ep) != 0)
986 ret = -EAGAIN;
987 else {
988 dev_vdbg(ep->dev->dev, "%s %s %s\n", _ep->name,
989 value ? "set" : "clear",
990 wedged ? "wedge" : "halt");
991 /* set/clear */
992 if (value) {
993 if (ep->num == 0)
994 ep->dev->protocol_stall = 1;
995 else
996 set_halt(ep);
997 if (wedged)
998 ep->wedged = 1;
999 } else {
1000 clear_halt(ep);
1001 ep->wedged = 0;
1002 }
1003 }
1004 spin_unlock_irqrestore(&ep->dev->lock, flags);
1005
1006 return ret;
1007 }
1008
1009 static int
net2272_set_halt(struct usb_ep * _ep,int value)1010 net2272_set_halt(struct usb_ep *_ep, int value)
1011 {
1012 return net2272_set_halt_and_wedge(_ep, value, 0);
1013 }
1014
1015 static int
net2272_set_wedge(struct usb_ep * _ep)1016 net2272_set_wedge(struct usb_ep *_ep)
1017 {
1018 if (!_ep || _ep->name == ep0name)
1019 return -EINVAL;
1020 return net2272_set_halt_and_wedge(_ep, 1, 1);
1021 }
1022
1023 static int
net2272_fifo_status(struct usb_ep * _ep)1024 net2272_fifo_status(struct usb_ep *_ep)
1025 {
1026 struct net2272_ep *ep;
1027 u16 avail;
1028
1029 ep = container_of(_ep, struct net2272_ep, ep);
1030 if (!_ep || (!ep->desc && ep->num != 0))
1031 return -ENODEV;
1032 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1033 return -ESHUTDOWN;
1034
1035 avail = net2272_ep_read(ep, EP_AVAIL1) << 8;
1036 avail |= net2272_ep_read(ep, EP_AVAIL0);
1037 if (avail > ep->fifo_size)
1038 return -EOVERFLOW;
1039 if (ep->is_in)
1040 avail = ep->fifo_size - avail;
1041 return avail;
1042 }
1043
1044 static void
net2272_fifo_flush(struct usb_ep * _ep)1045 net2272_fifo_flush(struct usb_ep *_ep)
1046 {
1047 struct net2272_ep *ep;
1048
1049 ep = container_of(_ep, struct net2272_ep, ep);
1050 if (!_ep || (!ep->desc && ep->num != 0))
1051 return;
1052 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1053 return;
1054
1055 net2272_ep_write(ep, EP_STAT1, 1 << BUFFER_FLUSH);
1056 }
1057
1058 static const struct usb_ep_ops net2272_ep_ops = {
1059 .enable = net2272_enable,
1060 .disable = net2272_disable,
1061
1062 .alloc_request = net2272_alloc_request,
1063 .free_request = net2272_free_request,
1064
1065 .queue = net2272_queue,
1066 .dequeue = net2272_dequeue,
1067
1068 .set_halt = net2272_set_halt,
1069 .set_wedge = net2272_set_wedge,
1070 .fifo_status = net2272_fifo_status,
1071 .fifo_flush = net2272_fifo_flush,
1072 };
1073
1074 /*---------------------------------------------------------------------------*/
1075
1076 static int
net2272_get_frame(struct usb_gadget * _gadget)1077 net2272_get_frame(struct usb_gadget *_gadget)
1078 {
1079 struct net2272 *dev;
1080 unsigned long flags;
1081 u16 ret;
1082
1083 if (!_gadget)
1084 return -ENODEV;
1085 dev = container_of(_gadget, struct net2272, gadget);
1086 spin_lock_irqsave(&dev->lock, flags);
1087
1088 ret = net2272_read(dev, FRAME1) << 8;
1089 ret |= net2272_read(dev, FRAME0);
1090
1091 spin_unlock_irqrestore(&dev->lock, flags);
1092 return ret;
1093 }
1094
1095 static int
net2272_wakeup(struct usb_gadget * _gadget)1096 net2272_wakeup(struct usb_gadget *_gadget)
1097 {
1098 struct net2272 *dev;
1099 u8 tmp;
1100 unsigned long flags;
1101
1102 if (!_gadget)
1103 return 0;
1104 dev = container_of(_gadget, struct net2272, gadget);
1105
1106 spin_lock_irqsave(&dev->lock, flags);
1107 tmp = net2272_read(dev, USBCTL0);
1108 if (tmp & (1 << IO_WAKEUP_ENABLE))
1109 net2272_write(dev, USBCTL1, (1 << GENERATE_RESUME));
1110
1111 spin_unlock_irqrestore(&dev->lock, flags);
1112
1113 return 0;
1114 }
1115
1116 static int
net2272_set_selfpowered(struct usb_gadget * _gadget,int value)1117 net2272_set_selfpowered(struct usb_gadget *_gadget, int value)
1118 {
1119 if (!_gadget)
1120 return -ENODEV;
1121
1122 _gadget->is_selfpowered = (value != 0);
1123
1124 return 0;
1125 }
1126
1127 static int
net2272_pullup(struct usb_gadget * _gadget,int is_on)1128 net2272_pullup(struct usb_gadget *_gadget, int is_on)
1129 {
1130 struct net2272 *dev;
1131 u8 tmp;
1132 unsigned long flags;
1133
1134 if (!_gadget)
1135 return -ENODEV;
1136 dev = container_of(_gadget, struct net2272, gadget);
1137
1138 spin_lock_irqsave(&dev->lock, flags);
1139 tmp = net2272_read(dev, USBCTL0);
1140 dev->softconnect = (is_on != 0);
1141 if (is_on)
1142 tmp |= (1 << USB_DETECT_ENABLE);
1143 else
1144 tmp &= ~(1 << USB_DETECT_ENABLE);
1145 net2272_write(dev, USBCTL0, tmp);
1146 spin_unlock_irqrestore(&dev->lock, flags);
1147
1148 return 0;
1149 }
1150
1151 static int net2272_start(struct usb_gadget *_gadget,
1152 struct usb_gadget_driver *driver);
1153 static int net2272_stop(struct usb_gadget *_gadget);
1154 static void net2272_async_callbacks(struct usb_gadget *_gadget, bool enable);
1155
1156 static const struct usb_gadget_ops net2272_ops = {
1157 .get_frame = net2272_get_frame,
1158 .wakeup = net2272_wakeup,
1159 .set_selfpowered = net2272_set_selfpowered,
1160 .pullup = net2272_pullup,
1161 .udc_start = net2272_start,
1162 .udc_stop = net2272_stop,
1163 .udc_async_callbacks = net2272_async_callbacks,
1164 };
1165
1166 /*---------------------------------------------------------------------------*/
1167
1168 static ssize_t
registers_show(struct device * _dev,struct device_attribute * attr,char * buf)1169 registers_show(struct device *_dev, struct device_attribute *attr, char *buf)
1170 {
1171 struct net2272 *dev;
1172 char *next;
1173 unsigned size, t;
1174 unsigned long flags;
1175 u8 t1, t2;
1176 int i;
1177 const char *s;
1178
1179 dev = dev_get_drvdata(_dev);
1180 next = buf;
1181 size = PAGE_SIZE;
1182 spin_lock_irqsave(&dev->lock, flags);
1183
1184 /* Main Control Registers */
1185 t = scnprintf(next, size, "%s version %s,"
1186 "chiprev %02x, locctl %02x\n"
1187 "irqenb0 %02x irqenb1 %02x "
1188 "irqstat0 %02x irqstat1 %02x\n",
1189 driver_name, driver_vers, dev->chiprev,
1190 net2272_read(dev, LOCCTL),
1191 net2272_read(dev, IRQENB0),
1192 net2272_read(dev, IRQENB1),
1193 net2272_read(dev, IRQSTAT0),
1194 net2272_read(dev, IRQSTAT1));
1195 size -= t;
1196 next += t;
1197
1198 /* DMA */
1199 t1 = net2272_read(dev, DMAREQ);
1200 t = scnprintf(next, size, "\ndmareq %02x: %s %s%s%s%s\n",
1201 t1, ep_name[(t1 & 0x01) + 1],
1202 t1 & (1 << DMA_CONTROL_DACK) ? "dack " : "",
1203 t1 & (1 << DMA_REQUEST_ENABLE) ? "reqenb " : "",
1204 t1 & (1 << DMA_REQUEST) ? "req " : "",
1205 t1 & (1 << DMA_BUFFER_VALID) ? "valid " : "");
1206 size -= t;
1207 next += t;
1208
1209 /* USB Control Registers */
1210 t1 = net2272_read(dev, USBCTL1);
1211 if (t1 & (1 << VBUS_PIN)) {
1212 if (t1 & (1 << USB_HIGH_SPEED))
1213 s = "high speed";
1214 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1215 s = "powered";
1216 else
1217 s = "full speed";
1218 } else
1219 s = "not attached";
1220 t = scnprintf(next, size,
1221 "usbctl0 %02x usbctl1 %02x addr 0x%02x (%s)\n",
1222 net2272_read(dev, USBCTL0), t1,
1223 net2272_read(dev, OURADDR), s);
1224 size -= t;
1225 next += t;
1226
1227 /* Endpoint Registers */
1228 for (i = 0; i < 4; ++i) {
1229 struct net2272_ep *ep;
1230
1231 ep = &dev->ep[i];
1232 if (i && !ep->desc)
1233 continue;
1234
1235 t1 = net2272_ep_read(ep, EP_CFG);
1236 t2 = net2272_ep_read(ep, EP_RSPSET);
1237 t = scnprintf(next, size,
1238 "\n%s\tcfg %02x rsp (%02x) %s%s%s%s%s%s%s%s"
1239 "irqenb %02x\n",
1240 ep->ep.name, t1, t2,
1241 (t2 & (1 << ALT_NAK_OUT_PACKETS)) ? "NAK " : "",
1242 (t2 & (1 << HIDE_STATUS_PHASE)) ? "hide " : "",
1243 (t2 & (1 << AUTOVALIDATE)) ? "auto " : "",
1244 (t2 & (1 << INTERRUPT_MODE)) ? "interrupt " : "",
1245 (t2 & (1 << CONTROL_STATUS_PHASE_HANDSHAKE)) ? "status " : "",
1246 (t2 & (1 << NAK_OUT_PACKETS_MODE)) ? "NAKmode " : "",
1247 (t2 & (1 << ENDPOINT_TOGGLE)) ? "DATA1 " : "DATA0 ",
1248 (t2 & (1 << ENDPOINT_HALT)) ? "HALT " : "",
1249 net2272_ep_read(ep, EP_IRQENB));
1250 size -= t;
1251 next += t;
1252
1253 t = scnprintf(next, size,
1254 "\tstat0 %02x stat1 %02x avail %04x "
1255 "(ep%d%s-%s)%s\n",
1256 net2272_ep_read(ep, EP_STAT0),
1257 net2272_ep_read(ep, EP_STAT1),
1258 (net2272_ep_read(ep, EP_AVAIL1) << 8) | net2272_ep_read(ep, EP_AVAIL0),
1259 t1 & 0x0f,
1260 ep->is_in ? "in" : "out",
1261 type_string(t1 >> 5),
1262 ep->stopped ? "*" : "");
1263 size -= t;
1264 next += t;
1265
1266 t = scnprintf(next, size,
1267 "\tep_transfer %06x\n",
1268 ((net2272_ep_read(ep, EP_TRANSFER2) & 0xff) << 16) |
1269 ((net2272_ep_read(ep, EP_TRANSFER1) & 0xff) << 8) |
1270 ((net2272_ep_read(ep, EP_TRANSFER0) & 0xff)));
1271 size -= t;
1272 next += t;
1273
1274 t1 = net2272_ep_read(ep, EP_BUFF_STATES) & 0x03;
1275 t2 = (net2272_ep_read(ep, EP_BUFF_STATES) >> 2) & 0x03;
1276 t = scnprintf(next, size,
1277 "\tbuf-a %s buf-b %s\n",
1278 buf_state_string(t1),
1279 buf_state_string(t2));
1280 size -= t;
1281 next += t;
1282 }
1283
1284 spin_unlock_irqrestore(&dev->lock, flags);
1285
1286 return PAGE_SIZE - size;
1287 }
1288 static DEVICE_ATTR_RO(registers);
1289
1290 /*---------------------------------------------------------------------------*/
1291
1292 static void
net2272_set_fifo_mode(struct net2272 * dev,int mode)1293 net2272_set_fifo_mode(struct net2272 *dev, int mode)
1294 {
1295 u8 tmp;
1296
1297 tmp = net2272_read(dev, LOCCTL) & 0x3f;
1298 tmp |= (mode << 6);
1299 net2272_write(dev, LOCCTL, tmp);
1300
1301 INIT_LIST_HEAD(&dev->gadget.ep_list);
1302
1303 /* always ep-a, ep-c ... maybe not ep-b */
1304 list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1305
1306 switch (mode) {
1307 case 0:
1308 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1309 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 512;
1310 break;
1311 case 1:
1312 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1313 dev->ep[1].fifo_size = 1024;
1314 dev->ep[2].fifo_size = 512;
1315 break;
1316 case 2:
1317 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1318 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1319 break;
1320 case 3:
1321 dev->ep[1].fifo_size = 1024;
1322 break;
1323 }
1324
1325 /* ep-c is always 2 512 byte buffers */
1326 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1327 dev->ep[3].fifo_size = 512;
1328 }
1329
1330 /*---------------------------------------------------------------------------*/
1331
1332 static void
net2272_usb_reset(struct net2272 * dev)1333 net2272_usb_reset(struct net2272 *dev)
1334 {
1335 dev->gadget.speed = USB_SPEED_UNKNOWN;
1336
1337 net2272_cancel_dma(dev);
1338
1339 net2272_write(dev, IRQENB0, 0);
1340 net2272_write(dev, IRQENB1, 0);
1341
1342 /* clear irq state */
1343 net2272_write(dev, IRQSTAT0, 0xff);
1344 net2272_write(dev, IRQSTAT1, ~(1 << SUSPEND_REQUEST_INTERRUPT));
1345
1346 net2272_write(dev, DMAREQ,
1347 (0 << DMA_BUFFER_VALID) |
1348 (0 << DMA_REQUEST_ENABLE) |
1349 (1 << DMA_CONTROL_DACK) |
1350 (dev->dma_eot_polarity << EOT_POLARITY) |
1351 (dev->dma_dack_polarity << DACK_POLARITY) |
1352 (dev->dma_dreq_polarity << DREQ_POLARITY) |
1353 ((dma_ep >> 1) << DMA_ENDPOINT_SELECT));
1354
1355 net2272_cancel_dma(dev);
1356 net2272_set_fifo_mode(dev, (fifo_mode <= 3) ? fifo_mode : 0);
1357
1358 /* Set the NET2272 ep fifo data width to 16-bit mode and for correct byte swapping
1359 * note that the higher level gadget drivers are expected to convert data to little endian.
1360 * Enable byte swap for your local bus/cpu if needed by setting BYTE_SWAP in LOCCTL here
1361 */
1362 net2272_write(dev, LOCCTL, net2272_read(dev, LOCCTL) | (1 << DATA_WIDTH));
1363 net2272_write(dev, LOCCTL1, (dma_mode << DMA_MODE));
1364 }
1365
1366 static void
net2272_usb_reinit(struct net2272 * dev)1367 net2272_usb_reinit(struct net2272 *dev)
1368 {
1369 int i;
1370
1371 /* basic endpoint init */
1372 for (i = 0; i < 4; ++i) {
1373 struct net2272_ep *ep = &dev->ep[i];
1374
1375 ep->ep.name = ep_name[i];
1376 ep->dev = dev;
1377 ep->num = i;
1378 ep->not_empty = 0;
1379
1380 if (use_dma && ep->num == dma_ep)
1381 ep->dma = 1;
1382
1383 if (i > 0 && i <= 3)
1384 ep->fifo_size = 512;
1385 else
1386 ep->fifo_size = 64;
1387 net2272_ep_reset(ep);
1388
1389 if (i == 0) {
1390 ep->ep.caps.type_control = true;
1391 } else {
1392 ep->ep.caps.type_iso = true;
1393 ep->ep.caps.type_bulk = true;
1394 ep->ep.caps.type_int = true;
1395 }
1396
1397 ep->ep.caps.dir_in = true;
1398 ep->ep.caps.dir_out = true;
1399 }
1400 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
1401
1402 dev->gadget.ep0 = &dev->ep[0].ep;
1403 dev->ep[0].stopped = 0;
1404 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
1405 }
1406
1407 static void
net2272_ep0_start(struct net2272 * dev)1408 net2272_ep0_start(struct net2272 *dev)
1409 {
1410 struct net2272_ep *ep0 = &dev->ep[0];
1411
1412 net2272_ep_write(ep0, EP_RSPSET,
1413 (1 << NAK_OUT_PACKETS_MODE) |
1414 (1 << ALT_NAK_OUT_PACKETS));
1415 net2272_ep_write(ep0, EP_RSPCLR,
1416 (1 << HIDE_STATUS_PHASE) |
1417 (1 << CONTROL_STATUS_PHASE_HANDSHAKE));
1418 net2272_write(dev, USBCTL0,
1419 (dev->softconnect << USB_DETECT_ENABLE) |
1420 (1 << USB_ROOT_PORT_WAKEUP_ENABLE) |
1421 (1 << IO_WAKEUP_ENABLE));
1422 net2272_write(dev, IRQENB0,
1423 (1 << SETUP_PACKET_INTERRUPT_ENABLE) |
1424 (1 << ENDPOINT_0_INTERRUPT_ENABLE) |
1425 (1 << DMA_DONE_INTERRUPT_ENABLE));
1426 net2272_write(dev, IRQENB1,
1427 (1 << VBUS_INTERRUPT_ENABLE) |
1428 (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE) |
1429 (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE));
1430 }
1431
1432 /* when a driver is successfully registered, it will receive
1433 * control requests including set_configuration(), which enables
1434 * non-control requests. then usb traffic follows until a
1435 * disconnect is reported. then a host may connect again, or
1436 * the driver might get unbound.
1437 */
net2272_start(struct usb_gadget * _gadget,struct usb_gadget_driver * driver)1438 static int net2272_start(struct usb_gadget *_gadget,
1439 struct usb_gadget_driver *driver)
1440 {
1441 struct net2272 *dev;
1442 unsigned i;
1443
1444 if (!driver || !driver->setup ||
1445 driver->max_speed != USB_SPEED_HIGH)
1446 return -EINVAL;
1447
1448 dev = container_of(_gadget, struct net2272, gadget);
1449
1450 for (i = 0; i < 4; ++i)
1451 dev->ep[i].irqs = 0;
1452 /* hook up the driver ... */
1453 dev->softconnect = 1;
1454 dev->driver = driver;
1455
1456 /* ... then enable host detection and ep0; and we're ready
1457 * for set_configuration as well as eventual disconnect.
1458 */
1459 net2272_ep0_start(dev);
1460
1461 return 0;
1462 }
1463
1464 static void
stop_activity(struct net2272 * dev,struct usb_gadget_driver * driver)1465 stop_activity(struct net2272 *dev, struct usb_gadget_driver *driver)
1466 {
1467 int i;
1468
1469 /* don't disconnect if it's not connected */
1470 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1471 driver = NULL;
1472
1473 /* stop hardware; prevent new request submissions;
1474 * and kill any outstanding requests.
1475 */
1476 net2272_usb_reset(dev);
1477 for (i = 0; i < 4; ++i)
1478 net2272_dequeue_all(&dev->ep[i]);
1479
1480 /* report disconnect; the driver is already quiesced */
1481 if (dev->async_callbacks && driver) {
1482 spin_unlock(&dev->lock);
1483 driver->disconnect(&dev->gadget);
1484 spin_lock(&dev->lock);
1485 }
1486
1487 net2272_usb_reinit(dev);
1488 }
1489
net2272_stop(struct usb_gadget * _gadget)1490 static int net2272_stop(struct usb_gadget *_gadget)
1491 {
1492 struct net2272 *dev;
1493 unsigned long flags;
1494
1495 dev = container_of(_gadget, struct net2272, gadget);
1496
1497 spin_lock_irqsave(&dev->lock, flags);
1498 stop_activity(dev, NULL);
1499 spin_unlock_irqrestore(&dev->lock, flags);
1500
1501 dev->driver = NULL;
1502
1503 return 0;
1504 }
1505
net2272_async_callbacks(struct usb_gadget * _gadget,bool enable)1506 static void net2272_async_callbacks(struct usb_gadget *_gadget, bool enable)
1507 {
1508 struct net2272 *dev = container_of(_gadget, struct net2272, gadget);
1509
1510 spin_lock_irq(&dev->lock);
1511 dev->async_callbacks = enable;
1512 spin_unlock_irq(&dev->lock);
1513 }
1514
1515 /*---------------------------------------------------------------------------*/
1516 /* handle ep-a/ep-b dma completions */
1517 static void
net2272_handle_dma(struct net2272_ep * ep)1518 net2272_handle_dma(struct net2272_ep *ep)
1519 {
1520 struct net2272_request *req;
1521 unsigned len;
1522 int status;
1523
1524 if (!list_empty(&ep->queue))
1525 req = list_entry(ep->queue.next,
1526 struct net2272_request, queue);
1527 else
1528 req = NULL;
1529
1530 dev_vdbg(ep->dev->dev, "handle_dma %s req %p\n", ep->ep.name, req);
1531
1532 /* Ensure DREQ is de-asserted */
1533 net2272_write(ep->dev, DMAREQ,
1534 (0 << DMA_BUFFER_VALID)
1535 | (0 << DMA_REQUEST_ENABLE)
1536 | (1 << DMA_CONTROL_DACK)
1537 | (ep->dev->dma_eot_polarity << EOT_POLARITY)
1538 | (ep->dev->dma_dack_polarity << DACK_POLARITY)
1539 | (ep->dev->dma_dreq_polarity << DREQ_POLARITY)
1540 | (ep->dma << DMA_ENDPOINT_SELECT));
1541
1542 ep->dev->dma_busy = 0;
1543
1544 net2272_ep_write(ep, EP_IRQENB,
1545 (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
1546 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE)
1547 | net2272_ep_read(ep, EP_IRQENB));
1548
1549 /* device-to-host transfer completed */
1550 if (ep->is_in) {
1551 /* validate a short packet or zlp if necessary */
1552 if ((req->req.length % ep->ep.maxpacket != 0) ||
1553 req->req.zero)
1554 set_fifo_bytecount(ep, 0);
1555
1556 net2272_done(ep, req, 0);
1557 if (!list_empty(&ep->queue)) {
1558 req = list_entry(ep->queue.next,
1559 struct net2272_request, queue);
1560 status = net2272_kick_dma(ep, req);
1561 if (status < 0)
1562 net2272_pio_advance(ep);
1563 }
1564
1565 /* host-to-device transfer completed */
1566 } else {
1567 /* terminated with a short packet? */
1568 if (net2272_read(ep->dev, IRQSTAT0) &
1569 (1 << DMA_DONE_INTERRUPT)) {
1570 /* abort system dma */
1571 net2272_cancel_dma(ep->dev);
1572 }
1573
1574 /* EP_TRANSFER will contain the number of bytes
1575 * actually received.
1576 * NOTE: There is no overflow detection on EP_TRANSFER:
1577 * We can't deal with transfers larger than 2^24 bytes!
1578 */
1579 len = (net2272_ep_read(ep, EP_TRANSFER2) << 16)
1580 | (net2272_ep_read(ep, EP_TRANSFER1) << 8)
1581 | (net2272_ep_read(ep, EP_TRANSFER0));
1582
1583 if (ep->not_empty)
1584 len += 4;
1585
1586 req->req.actual += len;
1587
1588 /* get any remaining data */
1589 net2272_pio_advance(ep);
1590 }
1591 }
1592
1593 /*---------------------------------------------------------------------------*/
1594
1595 static void
net2272_handle_ep(struct net2272_ep * ep)1596 net2272_handle_ep(struct net2272_ep *ep)
1597 {
1598 struct net2272_request *req;
1599 u8 stat0, stat1;
1600
1601 if (!list_empty(&ep->queue))
1602 req = list_entry(ep->queue.next,
1603 struct net2272_request, queue);
1604 else
1605 req = NULL;
1606
1607 /* ack all, and handle what we care about */
1608 stat0 = net2272_ep_read(ep, EP_STAT0);
1609 stat1 = net2272_ep_read(ep, EP_STAT1);
1610 ep->irqs++;
1611
1612 dev_vdbg(ep->dev->dev, "%s ack ep_stat0 %02x, ep_stat1 %02x, req %p\n",
1613 ep->ep.name, stat0, stat1, req ? &req->req : NULL);
1614
1615 net2272_ep_write(ep, EP_STAT0, stat0 &
1616 ~((1 << NAK_OUT_PACKETS)
1617 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)));
1618 net2272_ep_write(ep, EP_STAT1, stat1);
1619
1620 /* data packet(s) received (in the fifo, OUT)
1621 * direction must be validated, otherwise control read status phase
1622 * could be interpreted as a valid packet
1623 */
1624 if (!ep->is_in && (stat0 & (1 << DATA_PACKET_RECEIVED_INTERRUPT)))
1625 net2272_pio_advance(ep);
1626 /* data packet(s) transmitted (IN) */
1627 else if (stat0 & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT))
1628 net2272_pio_advance(ep);
1629 }
1630
1631 static struct net2272_ep *
net2272_get_ep_by_addr(struct net2272 * dev,u16 wIndex)1632 net2272_get_ep_by_addr(struct net2272 *dev, u16 wIndex)
1633 {
1634 struct net2272_ep *ep;
1635
1636 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1637 return &dev->ep[0];
1638
1639 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
1640 u8 bEndpointAddress;
1641
1642 if (!ep->desc)
1643 continue;
1644 bEndpointAddress = ep->desc->bEndpointAddress;
1645 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1646 continue;
1647 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
1648 return ep;
1649 }
1650 return NULL;
1651 }
1652
1653 /*
1654 * USB Test Packet:
1655 * JKJKJKJK * 9
1656 * JJKKJJKK * 8
1657 * JJJJKKKK * 8
1658 * JJJJJJJKKKKKKK * 8
1659 * JJJJJJJK * 8
1660 * {JKKKKKKK * 10}, JK
1661 */
1662 static const u8 net2272_test_packet[] = {
1663 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1664 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1665 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1666 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1667 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1668 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFD, 0x7E
1669 };
1670
1671 static void
net2272_set_test_mode(struct net2272 * dev,int mode)1672 net2272_set_test_mode(struct net2272 *dev, int mode)
1673 {
1674 int i;
1675
1676 /* Disable all net2272 interrupts:
1677 * Nothing but a power cycle should stop the test.
1678 */
1679 net2272_write(dev, IRQENB0, 0x00);
1680 net2272_write(dev, IRQENB1, 0x00);
1681
1682 /* Force tranceiver to high-speed */
1683 net2272_write(dev, XCVRDIAG, 1 << FORCE_HIGH_SPEED);
1684
1685 net2272_write(dev, PAGESEL, 0);
1686 net2272_write(dev, EP_STAT0, 1 << DATA_PACKET_TRANSMITTED_INTERRUPT);
1687 net2272_write(dev, EP_RSPCLR,
1688 (1 << CONTROL_STATUS_PHASE_HANDSHAKE)
1689 | (1 << HIDE_STATUS_PHASE));
1690 net2272_write(dev, EP_CFG, 1 << ENDPOINT_DIRECTION);
1691 net2272_write(dev, EP_STAT1, 1 << BUFFER_FLUSH);
1692
1693 /* wait for status phase to complete */
1694 while (!(net2272_read(dev, EP_STAT0) &
1695 (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)))
1696 ;
1697
1698 /* Enable test mode */
1699 net2272_write(dev, USBTEST, mode);
1700
1701 /* load test packet */
1702 if (mode == USB_TEST_PACKET) {
1703 /* switch to 8 bit mode */
1704 net2272_write(dev, LOCCTL, net2272_read(dev, LOCCTL) &
1705 ~(1 << DATA_WIDTH));
1706
1707 for (i = 0; i < sizeof(net2272_test_packet); ++i)
1708 net2272_write(dev, EP_DATA, net2272_test_packet[i]);
1709
1710 /* Validate test packet */
1711 net2272_write(dev, EP_TRANSFER0, 0);
1712 }
1713 }
1714
1715 static void
net2272_handle_stat0_irqs(struct net2272 * dev,u8 stat)1716 net2272_handle_stat0_irqs(struct net2272 *dev, u8 stat)
1717 {
1718 struct net2272_ep *ep;
1719 u8 num, scratch;
1720
1721 /* starting a control request? */
1722 if (unlikely(stat & (1 << SETUP_PACKET_INTERRUPT))) {
1723 union {
1724 u8 raw[8];
1725 struct usb_ctrlrequest r;
1726 } u;
1727 int tmp = 0;
1728 struct net2272_request *req;
1729
1730 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
1731 if (net2272_read(dev, USBCTL1) & (1 << USB_HIGH_SPEED))
1732 dev->gadget.speed = USB_SPEED_HIGH;
1733 else
1734 dev->gadget.speed = USB_SPEED_FULL;
1735 dev_dbg(dev->dev, "%s\n",
1736 usb_speed_string(dev->gadget.speed));
1737 }
1738
1739 ep = &dev->ep[0];
1740 ep->irqs++;
1741
1742 /* make sure any leftover interrupt state is cleared */
1743 stat &= ~(1 << ENDPOINT_0_INTERRUPT);
1744 while (!list_empty(&ep->queue)) {
1745 req = list_entry(ep->queue.next,
1746 struct net2272_request, queue);
1747 net2272_done(ep, req,
1748 (req->req.actual == req->req.length) ? 0 : -EPROTO);
1749 }
1750 ep->stopped = 0;
1751 dev->protocol_stall = 0;
1752 net2272_ep_write(ep, EP_STAT0,
1753 (1 << DATA_IN_TOKEN_INTERRUPT)
1754 | (1 << DATA_OUT_TOKEN_INTERRUPT)
1755 | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)
1756 | (1 << DATA_PACKET_RECEIVED_INTERRUPT)
1757 | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT));
1758 net2272_ep_write(ep, EP_STAT1,
1759 (1 << TIMEOUT)
1760 | (1 << USB_OUT_ACK_SENT)
1761 | (1 << USB_OUT_NAK_SENT)
1762 | (1 << USB_IN_ACK_RCVD)
1763 | (1 << USB_IN_NAK_SENT)
1764 | (1 << USB_STALL_SENT)
1765 | (1 << LOCAL_OUT_ZLP));
1766
1767 /*
1768 * Ensure Control Read pre-validation setting is beyond maximum size
1769 * - Control Writes can leave non-zero values in EP_TRANSFER. If
1770 * an EP0 transfer following the Control Write is a Control Read,
1771 * the NET2272 sees the non-zero EP_TRANSFER as an unexpected
1772 * pre-validation count.
1773 * - Setting EP_TRANSFER beyond the maximum EP0 transfer size ensures
1774 * the pre-validation count cannot cause an unexpected validatation
1775 */
1776 net2272_write(dev, PAGESEL, 0);
1777 net2272_write(dev, EP_TRANSFER2, 0xff);
1778 net2272_write(dev, EP_TRANSFER1, 0xff);
1779 net2272_write(dev, EP_TRANSFER0, 0xff);
1780
1781 u.raw[0] = net2272_read(dev, SETUP0);
1782 u.raw[1] = net2272_read(dev, SETUP1);
1783 u.raw[2] = net2272_read(dev, SETUP2);
1784 u.raw[3] = net2272_read(dev, SETUP3);
1785 u.raw[4] = net2272_read(dev, SETUP4);
1786 u.raw[5] = net2272_read(dev, SETUP5);
1787 u.raw[6] = net2272_read(dev, SETUP6);
1788 u.raw[7] = net2272_read(dev, SETUP7);
1789 /*
1790 * If you have a big endian cpu make sure le16_to_cpus
1791 * performs the proper byte swapping here...
1792 */
1793 le16_to_cpus(&u.r.wValue);
1794 le16_to_cpus(&u.r.wIndex);
1795 le16_to_cpus(&u.r.wLength);
1796
1797 /* ack the irq */
1798 net2272_write(dev, IRQSTAT0, 1 << SETUP_PACKET_INTERRUPT);
1799 stat ^= (1 << SETUP_PACKET_INTERRUPT);
1800
1801 /* watch control traffic at the token level, and force
1802 * synchronization before letting the status phase happen.
1803 */
1804 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
1805 if (ep->is_in) {
1806 scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE)
1807 | (1 << DATA_OUT_TOKEN_INTERRUPT_ENABLE)
1808 | (1 << DATA_IN_TOKEN_INTERRUPT_ENABLE);
1809 stop_out_naking(ep);
1810 } else
1811 scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE)
1812 | (1 << DATA_OUT_TOKEN_INTERRUPT_ENABLE)
1813 | (1 << DATA_IN_TOKEN_INTERRUPT_ENABLE);
1814 net2272_ep_write(ep, EP_IRQENB, scratch);
1815
1816 if ((u.r.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
1817 goto delegate;
1818 switch (u.r.bRequest) {
1819 case USB_REQ_GET_STATUS: {
1820 struct net2272_ep *e;
1821 u16 status = 0;
1822
1823 switch (u.r.bRequestType & USB_RECIP_MASK) {
1824 case USB_RECIP_ENDPOINT:
1825 e = net2272_get_ep_by_addr(dev, u.r.wIndex);
1826 if (!e || u.r.wLength > 2)
1827 goto do_stall;
1828 if (net2272_ep_read(e, EP_RSPSET) & (1 << ENDPOINT_HALT))
1829 status = cpu_to_le16(1);
1830 else
1831 status = cpu_to_le16(0);
1832
1833 /* don't bother with a request object! */
1834 net2272_ep_write(&dev->ep[0], EP_IRQENB, 0);
1835 writew(status, net2272_reg_addr(dev, EP_DATA));
1836 set_fifo_bytecount(&dev->ep[0], 0);
1837 allow_status(ep);
1838 dev_vdbg(dev->dev, "%s stat %02x\n",
1839 ep->ep.name, status);
1840 goto next_endpoints;
1841 case USB_RECIP_DEVICE:
1842 if (u.r.wLength > 2)
1843 goto do_stall;
1844 if (dev->gadget.is_selfpowered)
1845 status = (1 << USB_DEVICE_SELF_POWERED);
1846
1847 /* don't bother with a request object! */
1848 net2272_ep_write(&dev->ep[0], EP_IRQENB, 0);
1849 writew(status, net2272_reg_addr(dev, EP_DATA));
1850 set_fifo_bytecount(&dev->ep[0], 0);
1851 allow_status(ep);
1852 dev_vdbg(dev->dev, "device stat %02x\n", status);
1853 goto next_endpoints;
1854 case USB_RECIP_INTERFACE:
1855 if (u.r.wLength > 2)
1856 goto do_stall;
1857
1858 /* don't bother with a request object! */
1859 net2272_ep_write(&dev->ep[0], EP_IRQENB, 0);
1860 writew(status, net2272_reg_addr(dev, EP_DATA));
1861 set_fifo_bytecount(&dev->ep[0], 0);
1862 allow_status(ep);
1863 dev_vdbg(dev->dev, "interface status %02x\n", status);
1864 goto next_endpoints;
1865 }
1866
1867 break;
1868 }
1869 case USB_REQ_CLEAR_FEATURE: {
1870 struct net2272_ep *e;
1871
1872 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
1873 goto delegate;
1874 if (u.r.wValue != USB_ENDPOINT_HALT ||
1875 u.r.wLength != 0)
1876 goto do_stall;
1877 e = net2272_get_ep_by_addr(dev, u.r.wIndex);
1878 if (!e)
1879 goto do_stall;
1880 if (e->wedged) {
1881 dev_vdbg(dev->dev, "%s wedged, halt not cleared\n",
1882 ep->ep.name);
1883 } else {
1884 dev_vdbg(dev->dev, "%s clear halt\n", ep->ep.name);
1885 clear_halt(e);
1886 }
1887 allow_status(ep);
1888 goto next_endpoints;
1889 }
1890 case USB_REQ_SET_FEATURE: {
1891 struct net2272_ep *e;
1892
1893 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1894 if (u.r.wIndex != NORMAL_OPERATION)
1895 net2272_set_test_mode(dev, (u.r.wIndex >> 8));
1896 allow_status(ep);
1897 dev_vdbg(dev->dev, "test mode: %d\n", u.r.wIndex);
1898 goto next_endpoints;
1899 } else if (u.r.bRequestType != USB_RECIP_ENDPOINT)
1900 goto delegate;
1901 if (u.r.wValue != USB_ENDPOINT_HALT ||
1902 u.r.wLength != 0)
1903 goto do_stall;
1904 e = net2272_get_ep_by_addr(dev, u.r.wIndex);
1905 if (!e)
1906 goto do_stall;
1907 set_halt(e);
1908 allow_status(ep);
1909 dev_vdbg(dev->dev, "%s set halt\n", ep->ep.name);
1910 goto next_endpoints;
1911 }
1912 case USB_REQ_SET_ADDRESS: {
1913 net2272_write(dev, OURADDR, u.r.wValue & 0xff);
1914 allow_status(ep);
1915 break;
1916 }
1917 default:
1918 delegate:
1919 dev_vdbg(dev->dev, "setup %02x.%02x v%04x i%04x "
1920 "ep_cfg %08x\n",
1921 u.r.bRequestType, u.r.bRequest,
1922 u.r.wValue, u.r.wIndex,
1923 net2272_ep_read(ep, EP_CFG));
1924 if (dev->async_callbacks) {
1925 spin_unlock(&dev->lock);
1926 tmp = dev->driver->setup(&dev->gadget, &u.r);
1927 spin_lock(&dev->lock);
1928 }
1929 }
1930
1931 /* stall ep0 on error */
1932 if (tmp < 0) {
1933 do_stall:
1934 dev_vdbg(dev->dev, "req %02x.%02x protocol STALL; stat %d\n",
1935 u.r.bRequestType, u.r.bRequest, tmp);
1936 dev->protocol_stall = 1;
1937 }
1938 /* endpoint dma irq? */
1939 } else if (stat & (1 << DMA_DONE_INTERRUPT)) {
1940 net2272_cancel_dma(dev);
1941 net2272_write(dev, IRQSTAT0, 1 << DMA_DONE_INTERRUPT);
1942 stat &= ~(1 << DMA_DONE_INTERRUPT);
1943 num = (net2272_read(dev, DMAREQ) & (1 << DMA_ENDPOINT_SELECT))
1944 ? 2 : 1;
1945
1946 ep = &dev->ep[num];
1947 net2272_handle_dma(ep);
1948 }
1949
1950 next_endpoints:
1951 /* endpoint data irq? */
1952 scratch = stat & 0x0f;
1953 stat &= ~0x0f;
1954 for (num = 0; scratch; num++) {
1955 u8 t;
1956
1957 /* does this endpoint's FIFO and queue need tending? */
1958 t = 1 << num;
1959 if ((scratch & t) == 0)
1960 continue;
1961 scratch ^= t;
1962
1963 ep = &dev->ep[num];
1964 net2272_handle_ep(ep);
1965 }
1966
1967 /* some interrupts we can just ignore */
1968 stat &= ~(1 << SOF_INTERRUPT);
1969
1970 if (stat)
1971 dev_dbg(dev->dev, "unhandled irqstat0 %02x\n", stat);
1972 }
1973
1974 static void
net2272_handle_stat1_irqs(struct net2272 * dev,u8 stat)1975 net2272_handle_stat1_irqs(struct net2272 *dev, u8 stat)
1976 {
1977 u8 tmp, mask;
1978
1979 /* after disconnect there's nothing else to do! */
1980 tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT);
1981 mask = (1 << USB_HIGH_SPEED) | (1 << USB_FULL_SPEED);
1982
1983 if (stat & tmp) {
1984 bool reset = false;
1985 bool disconnect = false;
1986
1987 /*
1988 * Ignore disconnects and resets if the speed hasn't been set.
1989 * VBUS can bounce and there's always an initial reset.
1990 */
1991 net2272_write(dev, IRQSTAT1, tmp);
1992 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
1993 if ((stat & (1 << VBUS_INTERRUPT)) &&
1994 (net2272_read(dev, USBCTL1) &
1995 (1 << VBUS_PIN)) == 0) {
1996 disconnect = true;
1997 dev_dbg(dev->dev, "disconnect %s\n",
1998 dev->driver->driver.name);
1999 } else if ((stat & (1 << ROOT_PORT_RESET_INTERRUPT)) &&
2000 (net2272_read(dev, USBCTL1) & mask)
2001 == 0) {
2002 reset = true;
2003 dev_dbg(dev->dev, "reset %s\n",
2004 dev->driver->driver.name);
2005 }
2006
2007 if (disconnect || reset) {
2008 stop_activity(dev, dev->driver);
2009 net2272_ep0_start(dev);
2010 if (dev->async_callbacks) {
2011 spin_unlock(&dev->lock);
2012 if (reset)
2013 usb_gadget_udc_reset(&dev->gadget, dev->driver);
2014 else
2015 (dev->driver->disconnect)(&dev->gadget);
2016 spin_lock(&dev->lock);
2017 }
2018 return;
2019 }
2020 }
2021 stat &= ~tmp;
2022
2023 if (!stat)
2024 return;
2025 }
2026
2027 tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT);
2028 if (stat & tmp) {
2029 net2272_write(dev, IRQSTAT1, tmp);
2030 if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) {
2031 if (dev->async_callbacks && dev->driver->suspend)
2032 dev->driver->suspend(&dev->gadget);
2033 if (!enable_suspend) {
2034 stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT);
2035 dev_dbg(dev->dev, "Suspend disabled, ignoring\n");
2036 }
2037 } else {
2038 if (dev->async_callbacks && dev->driver->resume)
2039 dev->driver->resume(&dev->gadget);
2040 }
2041 stat &= ~tmp;
2042 }
2043
2044 /* clear any other status/irqs */
2045 if (stat)
2046 net2272_write(dev, IRQSTAT1, stat);
2047
2048 /* some status we can just ignore */
2049 stat &= ~((1 << CONTROL_STATUS_INTERRUPT)
2050 | (1 << SUSPEND_REQUEST_INTERRUPT)
2051 | (1 << RESUME_INTERRUPT));
2052 if (!stat)
2053 return;
2054 else
2055 dev_dbg(dev->dev, "unhandled irqstat1 %02x\n", stat);
2056 }
2057
net2272_irq(int irq,void * _dev)2058 static irqreturn_t net2272_irq(int irq, void *_dev)
2059 {
2060 struct net2272 *dev = _dev;
2061 #if defined(PLX_PCI_RDK) || defined(PLX_PCI_RDK2)
2062 u32 intcsr;
2063 #endif
2064 #if defined(PLX_PCI_RDK)
2065 u8 dmareq;
2066 #endif
2067 spin_lock(&dev->lock);
2068 #if defined(PLX_PCI_RDK)
2069 intcsr = readl(dev->rdk1.plx9054_base_addr + INTCSR);
2070
2071 if ((intcsr & LOCAL_INTERRUPT_TEST) == LOCAL_INTERRUPT_TEST) {
2072 writel(intcsr & ~(1 << PCI_INTERRUPT_ENABLE),
2073 dev->rdk1.plx9054_base_addr + INTCSR);
2074 net2272_handle_stat1_irqs(dev, net2272_read(dev, IRQSTAT1));
2075 net2272_handle_stat0_irqs(dev, net2272_read(dev, IRQSTAT0));
2076 intcsr = readl(dev->rdk1.plx9054_base_addr + INTCSR);
2077 writel(intcsr | (1 << PCI_INTERRUPT_ENABLE),
2078 dev->rdk1.plx9054_base_addr + INTCSR);
2079 }
2080 if ((intcsr & DMA_CHANNEL_0_TEST) == DMA_CHANNEL_0_TEST) {
2081 writeb((1 << CHANNEL_CLEAR_INTERRUPT | (0 << CHANNEL_ENABLE)),
2082 dev->rdk1.plx9054_base_addr + DMACSR0);
2083
2084 dmareq = net2272_read(dev, DMAREQ);
2085 if (dmareq & 0x01)
2086 net2272_handle_dma(&dev->ep[2]);
2087 else
2088 net2272_handle_dma(&dev->ep[1]);
2089 }
2090 #endif
2091 #if defined(PLX_PCI_RDK2)
2092 /* see if PCI int for us by checking irqstat */
2093 intcsr = readl(dev->rdk2.fpga_base_addr + RDK2_IRQSTAT);
2094 if (!(intcsr & (1 << NET2272_PCI_IRQ))) {
2095 spin_unlock(&dev->lock);
2096 return IRQ_NONE;
2097 }
2098 /* check dma interrupts */
2099 #endif
2100 /* Platform/devcice interrupt handler */
2101 #if !defined(PLX_PCI_RDK)
2102 net2272_handle_stat1_irqs(dev, net2272_read(dev, IRQSTAT1));
2103 net2272_handle_stat0_irqs(dev, net2272_read(dev, IRQSTAT0));
2104 #endif
2105 spin_unlock(&dev->lock);
2106
2107 return IRQ_HANDLED;
2108 }
2109
net2272_present(struct net2272 * dev)2110 static int net2272_present(struct net2272 *dev)
2111 {
2112 /*
2113 * Quick test to see if CPU can communicate properly with the NET2272.
2114 * Verifies connection using writes and reads to write/read and
2115 * read-only registers.
2116 *
2117 * This routine is strongly recommended especially during early bring-up
2118 * of new hardware, however for designs that do not apply Power On System
2119 * Tests (POST) it may discarded (or perhaps minimized).
2120 */
2121 unsigned int ii;
2122 u8 val, refval;
2123
2124 /* Verify NET2272 write/read SCRATCH register can write and read */
2125 refval = net2272_read(dev, SCRATCH);
2126 for (ii = 0; ii < 0x100; ii += 7) {
2127 net2272_write(dev, SCRATCH, ii);
2128 val = net2272_read(dev, SCRATCH);
2129 if (val != ii) {
2130 dev_dbg(dev->dev,
2131 "%s: write/read SCRATCH register test failed: "
2132 "wrote:0x%2.2x, read:0x%2.2x\n",
2133 __func__, ii, val);
2134 return -EINVAL;
2135 }
2136 }
2137 /* To be nice, we write the original SCRATCH value back: */
2138 net2272_write(dev, SCRATCH, refval);
2139
2140 /* Verify NET2272 CHIPREV register is read-only: */
2141 refval = net2272_read(dev, CHIPREV_2272);
2142 for (ii = 0; ii < 0x100; ii += 7) {
2143 net2272_write(dev, CHIPREV_2272, ii);
2144 val = net2272_read(dev, CHIPREV_2272);
2145 if (val != refval) {
2146 dev_dbg(dev->dev,
2147 "%s: write/read CHIPREV register test failed: "
2148 "wrote 0x%2.2x, read:0x%2.2x expected:0x%2.2x\n",
2149 __func__, ii, val, refval);
2150 return -EINVAL;
2151 }
2152 }
2153
2154 /*
2155 * Verify NET2272's "NET2270 legacy revision" register
2156 * - NET2272 has two revision registers. The NET2270 legacy revision
2157 * register should read the same value, regardless of the NET2272
2158 * silicon revision. The legacy register applies to NET2270
2159 * firmware being applied to the NET2272.
2160 */
2161 val = net2272_read(dev, CHIPREV_LEGACY);
2162 if (val != NET2270_LEGACY_REV) {
2163 /*
2164 * Unexpected legacy revision value
2165 * - Perhaps the chip is a NET2270?
2166 */
2167 dev_dbg(dev->dev,
2168 "%s: WARNING: UNEXPECTED NET2272 LEGACY REGISTER VALUE:\n"
2169 " - CHIPREV_LEGACY: expected 0x%2.2x, got:0x%2.2x. (Not NET2272?)\n",
2170 __func__, NET2270_LEGACY_REV, val);
2171 return -EINVAL;
2172 }
2173
2174 /*
2175 * Verify NET2272 silicon revision
2176 * - This revision register is appropriate for the silicon version
2177 * of the NET2272
2178 */
2179 val = net2272_read(dev, CHIPREV_2272);
2180 switch (val) {
2181 case CHIPREV_NET2272_R1:
2182 /*
2183 * NET2272 Rev 1 has DMA related errata:
2184 * - Newer silicon (Rev 1A or better) required
2185 */
2186 dev_dbg(dev->dev,
2187 "%s: Rev 1 detected: newer silicon recommended for DMA support\n",
2188 __func__);
2189 break;
2190 case CHIPREV_NET2272_R1A:
2191 break;
2192 default:
2193 /* NET2272 silicon version *may* not work with this firmware */
2194 dev_dbg(dev->dev,
2195 "%s: unexpected silicon revision register value: "
2196 " CHIPREV_2272: 0x%2.2x\n",
2197 __func__, val);
2198 /*
2199 * Return Success, even though the chip rev is not an expected value
2200 * - Older, pre-built firmware can attempt to operate on newer silicon
2201 * - Often, new silicon is perfectly compatible
2202 */
2203 }
2204
2205 /* Success: NET2272 checks out OK */
2206 return 0;
2207 }
2208
2209 static void
net2272_gadget_release(struct device * _dev)2210 net2272_gadget_release(struct device *_dev)
2211 {
2212 struct net2272 *dev = container_of(_dev, struct net2272, gadget.dev);
2213
2214 kfree(dev);
2215 }
2216
2217 /*---------------------------------------------------------------------------*/
2218
2219 static void
net2272_remove(struct net2272 * dev)2220 net2272_remove(struct net2272 *dev)
2221 {
2222 if (dev->added)
2223 usb_del_gadget(&dev->gadget);
2224 free_irq(dev->irq, dev);
2225 iounmap(dev->base_addr);
2226 device_remove_file(dev->dev, &dev_attr_registers);
2227
2228 dev_info(dev->dev, "unbind\n");
2229 }
2230
net2272_probe_init(struct device * dev,unsigned int irq)2231 static struct net2272 *net2272_probe_init(struct device *dev, unsigned int irq)
2232 {
2233 struct net2272 *ret;
2234
2235 if (!irq) {
2236 dev_dbg(dev, "No IRQ!\n");
2237 return ERR_PTR(-ENODEV);
2238 }
2239
2240 /* alloc, and start init */
2241 ret = kzalloc(sizeof(*ret), GFP_KERNEL);
2242 if (!ret)
2243 return ERR_PTR(-ENOMEM);
2244
2245 spin_lock_init(&ret->lock);
2246 ret->irq = irq;
2247 ret->dev = dev;
2248 ret->gadget.ops = &net2272_ops;
2249 ret->gadget.max_speed = USB_SPEED_HIGH;
2250
2251 /* the "gadget" abstracts/virtualizes the controller */
2252 ret->gadget.name = driver_name;
2253 usb_initialize_gadget(dev, &ret->gadget, net2272_gadget_release);
2254
2255 return ret;
2256 }
2257
2258 static int
net2272_probe_fin(struct net2272 * dev,unsigned int irqflags)2259 net2272_probe_fin(struct net2272 *dev, unsigned int irqflags)
2260 {
2261 int ret;
2262
2263 /* See if there... */
2264 if (net2272_present(dev)) {
2265 dev_warn(dev->dev, "2272 not found!\n");
2266 ret = -ENODEV;
2267 goto err;
2268 }
2269
2270 net2272_usb_reset(dev);
2271 net2272_usb_reinit(dev);
2272
2273 ret = request_irq(dev->irq, net2272_irq, irqflags, driver_name, dev);
2274 if (ret) {
2275 dev_err(dev->dev, "request interrupt %i failed\n", dev->irq);
2276 goto err;
2277 }
2278
2279 dev->chiprev = net2272_read(dev, CHIPREV_2272);
2280
2281 /* done */
2282 dev_info(dev->dev, "%s\n", driver_desc);
2283 dev_info(dev->dev, "irq %i, mem %p, chip rev %04x, dma %s\n",
2284 dev->irq, dev->base_addr, dev->chiprev,
2285 dma_mode_string());
2286 dev_info(dev->dev, "version: %s\n", driver_vers);
2287
2288 ret = device_create_file(dev->dev, &dev_attr_registers);
2289 if (ret)
2290 goto err_irq;
2291
2292 ret = usb_add_gadget(&dev->gadget);
2293 if (ret)
2294 goto err_add_udc;
2295 dev->added = 1;
2296
2297 return 0;
2298
2299 err_add_udc:
2300 device_remove_file(dev->dev, &dev_attr_registers);
2301 err_irq:
2302 free_irq(dev->irq, dev);
2303 err:
2304 return ret;
2305 }
2306
2307 #ifdef CONFIG_USB_PCI
2308
2309 /*
2310 * wrap this driver around the specified device, but
2311 * don't respond over USB until a gadget driver binds to us
2312 */
2313
2314 static int
net2272_rdk1_probe(struct pci_dev * pdev,struct net2272 * dev)2315 net2272_rdk1_probe(struct pci_dev *pdev, struct net2272 *dev)
2316 {
2317 unsigned long resource, len, tmp;
2318 void __iomem *mem_mapped_addr[4];
2319 int ret, i;
2320
2321 /*
2322 * BAR 0 holds PLX 9054 config registers
2323 * BAR 1 is i/o memory; unused here
2324 * BAR 2 holds EPLD config registers
2325 * BAR 3 holds NET2272 registers
2326 */
2327
2328 /* Find and map all address spaces */
2329 for (i = 0; i < 4; ++i) {
2330 if (i == 1)
2331 continue; /* BAR1 unused */
2332
2333 resource = pci_resource_start(pdev, i);
2334 len = pci_resource_len(pdev, i);
2335
2336 if (!request_mem_region(resource, len, driver_name)) {
2337 dev_dbg(dev->dev, "controller already in use\n");
2338 ret = -EBUSY;
2339 goto err;
2340 }
2341
2342 mem_mapped_addr[i] = ioremap(resource, len);
2343 if (mem_mapped_addr[i] == NULL) {
2344 release_mem_region(resource, len);
2345 dev_dbg(dev->dev, "can't map memory\n");
2346 ret = -EFAULT;
2347 goto err;
2348 }
2349 }
2350
2351 dev->rdk1.plx9054_base_addr = mem_mapped_addr[0];
2352 dev->rdk1.epld_base_addr = mem_mapped_addr[2];
2353 dev->base_addr = mem_mapped_addr[3];
2354
2355 /* Set PLX 9054 bus width (16 bits) */
2356 tmp = readl(dev->rdk1.plx9054_base_addr + LBRD1);
2357 writel((tmp & ~(3 << MEMORY_SPACE_LOCAL_BUS_WIDTH)) | W16_BIT,
2358 dev->rdk1.plx9054_base_addr + LBRD1);
2359
2360 /* Enable PLX 9054 Interrupts */
2361 writel(readl(dev->rdk1.plx9054_base_addr + INTCSR) |
2362 (1 << PCI_INTERRUPT_ENABLE) |
2363 (1 << LOCAL_INTERRUPT_INPUT_ENABLE),
2364 dev->rdk1.plx9054_base_addr + INTCSR);
2365
2366 writeb((1 << CHANNEL_CLEAR_INTERRUPT | (0 << CHANNEL_ENABLE)),
2367 dev->rdk1.plx9054_base_addr + DMACSR0);
2368
2369 /* reset */
2370 writeb((1 << EPLD_DMA_ENABLE) |
2371 (1 << DMA_CTL_DACK) |
2372 (1 << DMA_TIMEOUT_ENABLE) |
2373 (1 << USER) |
2374 (0 << MPX_MODE) |
2375 (1 << BUSWIDTH) |
2376 (1 << NET2272_RESET),
2377 dev->base_addr + EPLD_IO_CONTROL_REGISTER);
2378
2379 mb();
2380 writeb(readb(dev->base_addr + EPLD_IO_CONTROL_REGISTER) &
2381 ~(1 << NET2272_RESET),
2382 dev->base_addr + EPLD_IO_CONTROL_REGISTER);
2383 udelay(200);
2384
2385 return 0;
2386
2387 err:
2388 while (--i >= 0) {
2389 if (i == 1)
2390 continue; /* BAR1 unused */
2391 iounmap(mem_mapped_addr[i]);
2392 release_mem_region(pci_resource_start(pdev, i),
2393 pci_resource_len(pdev, i));
2394 }
2395
2396 return ret;
2397 }
2398
2399 static int
net2272_rdk2_probe(struct pci_dev * pdev,struct net2272 * dev)2400 net2272_rdk2_probe(struct pci_dev *pdev, struct net2272 *dev)
2401 {
2402 unsigned long resource, len;
2403 void __iomem *mem_mapped_addr[2];
2404 int ret, i;
2405
2406 /*
2407 * BAR 0 holds FGPA config registers
2408 * BAR 1 holds NET2272 registers
2409 */
2410
2411 /* Find and map all address spaces, bar2-3 unused in rdk 2 */
2412 for (i = 0; i < 2; ++i) {
2413 resource = pci_resource_start(pdev, i);
2414 len = pci_resource_len(pdev, i);
2415
2416 if (!request_mem_region(resource, len, driver_name)) {
2417 dev_dbg(dev->dev, "controller already in use\n");
2418 ret = -EBUSY;
2419 goto err;
2420 }
2421
2422 mem_mapped_addr[i] = ioremap(resource, len);
2423 if (mem_mapped_addr[i] == NULL) {
2424 release_mem_region(resource, len);
2425 dev_dbg(dev->dev, "can't map memory\n");
2426 ret = -EFAULT;
2427 goto err;
2428 }
2429 }
2430
2431 dev->rdk2.fpga_base_addr = mem_mapped_addr[0];
2432 dev->base_addr = mem_mapped_addr[1];
2433
2434 mb();
2435 /* Set 2272 bus width (16 bits) and reset */
2436 writel((1 << CHIP_RESET), dev->rdk2.fpga_base_addr + RDK2_LOCCTLRDK);
2437 udelay(200);
2438 writel((1 << BUS_WIDTH), dev->rdk2.fpga_base_addr + RDK2_LOCCTLRDK);
2439 /* Print fpga version number */
2440 dev_info(dev->dev, "RDK2 FPGA version %08x\n",
2441 readl(dev->rdk2.fpga_base_addr + RDK2_FPGAREV));
2442 /* Enable FPGA Interrupts */
2443 writel((1 << NET2272_PCI_IRQ), dev->rdk2.fpga_base_addr + RDK2_IRQENB);
2444
2445 return 0;
2446
2447 err:
2448 while (--i >= 0) {
2449 iounmap(mem_mapped_addr[i]);
2450 release_mem_region(pci_resource_start(pdev, i),
2451 pci_resource_len(pdev, i));
2452 }
2453
2454 return ret;
2455 }
2456
2457 static int
net2272_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)2458 net2272_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
2459 {
2460 struct net2272 *dev;
2461 int ret;
2462
2463 dev = net2272_probe_init(&pdev->dev, pdev->irq);
2464 if (IS_ERR(dev))
2465 return PTR_ERR(dev);
2466 dev->dev_id = pdev->device;
2467
2468 if (pci_enable_device(pdev) < 0) {
2469 ret = -ENODEV;
2470 goto err_put;
2471 }
2472
2473 pci_set_master(pdev);
2474
2475 switch (pdev->device) {
2476 case PCI_DEVICE_ID_RDK1: ret = net2272_rdk1_probe(pdev, dev); break;
2477 case PCI_DEVICE_ID_RDK2: ret = net2272_rdk2_probe(pdev, dev); break;
2478 default: BUG();
2479 }
2480 if (ret)
2481 goto err_pci;
2482
2483 ret = net2272_probe_fin(dev, 0);
2484 if (ret)
2485 goto err_pci;
2486
2487 pci_set_drvdata(pdev, dev);
2488
2489 return 0;
2490
2491 err_pci:
2492 pci_disable_device(pdev);
2493 err_put:
2494 usb_put_gadget(&dev->gadget);
2495
2496 return ret;
2497 }
2498
2499 static void
net2272_rdk1_remove(struct pci_dev * pdev,struct net2272 * dev)2500 net2272_rdk1_remove(struct pci_dev *pdev, struct net2272 *dev)
2501 {
2502 int i;
2503
2504 /* disable PLX 9054 interrupts */
2505 writel(readl(dev->rdk1.plx9054_base_addr + INTCSR) &
2506 ~(1 << PCI_INTERRUPT_ENABLE),
2507 dev->rdk1.plx9054_base_addr + INTCSR);
2508
2509 /* clean up resources allocated during probe() */
2510 iounmap(dev->rdk1.plx9054_base_addr);
2511 iounmap(dev->rdk1.epld_base_addr);
2512
2513 for (i = 0; i < 4; ++i) {
2514 if (i == 1)
2515 continue; /* BAR1 unused */
2516 release_mem_region(pci_resource_start(pdev, i),
2517 pci_resource_len(pdev, i));
2518 }
2519 }
2520
2521 static void
net2272_rdk2_remove(struct pci_dev * pdev,struct net2272 * dev)2522 net2272_rdk2_remove(struct pci_dev *pdev, struct net2272 *dev)
2523 {
2524 int i;
2525
2526 /* disable fpga interrupts
2527 writel(readl(dev->rdk1.plx9054_base_addr + INTCSR) &
2528 ~(1 << PCI_INTERRUPT_ENABLE),
2529 dev->rdk1.plx9054_base_addr + INTCSR);
2530 */
2531
2532 /* clean up resources allocated during probe() */
2533 iounmap(dev->rdk2.fpga_base_addr);
2534
2535 for (i = 0; i < 2; ++i)
2536 release_mem_region(pci_resource_start(pdev, i),
2537 pci_resource_len(pdev, i));
2538 }
2539
2540 static void
net2272_pci_remove(struct pci_dev * pdev)2541 net2272_pci_remove(struct pci_dev *pdev)
2542 {
2543 struct net2272 *dev = pci_get_drvdata(pdev);
2544
2545 net2272_remove(dev);
2546
2547 switch (pdev->device) {
2548 case PCI_DEVICE_ID_RDK1: net2272_rdk1_remove(pdev, dev); break;
2549 case PCI_DEVICE_ID_RDK2: net2272_rdk2_remove(pdev, dev); break;
2550 default: BUG();
2551 }
2552
2553 pci_disable_device(pdev);
2554
2555 usb_put_gadget(&dev->gadget);
2556 }
2557
2558 /* Table of matching PCI IDs */
2559 static struct pci_device_id pci_ids[] = {
2560 { /* RDK 1 card */
2561 .class = ((PCI_CLASS_BRIDGE_OTHER << 8) | 0xfe),
2562 .class_mask = 0,
2563 .vendor = PCI_VENDOR_ID_PLX,
2564 .device = PCI_DEVICE_ID_RDK1,
2565 .subvendor = PCI_ANY_ID,
2566 .subdevice = PCI_ANY_ID,
2567 },
2568 { /* RDK 2 card */
2569 .class = ((PCI_CLASS_BRIDGE_OTHER << 8) | 0xfe),
2570 .class_mask = 0,
2571 .vendor = PCI_VENDOR_ID_PLX,
2572 .device = PCI_DEVICE_ID_RDK2,
2573 .subvendor = PCI_ANY_ID,
2574 .subdevice = PCI_ANY_ID,
2575 },
2576 { }
2577 };
2578 MODULE_DEVICE_TABLE(pci, pci_ids);
2579
2580 static struct pci_driver net2272_pci_driver = {
2581 .name = driver_name,
2582 .id_table = pci_ids,
2583
2584 .probe = net2272_pci_probe,
2585 .remove = net2272_pci_remove,
2586 };
2587
net2272_pci_register(void)2588 static int net2272_pci_register(void)
2589 {
2590 return pci_register_driver(&net2272_pci_driver);
2591 }
2592
net2272_pci_unregister(void)2593 static void net2272_pci_unregister(void)
2594 {
2595 pci_unregister_driver(&net2272_pci_driver);
2596 }
2597
2598 #else
net2272_pci_register(void)2599 static inline int net2272_pci_register(void) { return 0; }
net2272_pci_unregister(void)2600 static inline void net2272_pci_unregister(void) { }
2601 #endif
2602
2603 /*---------------------------------------------------------------------------*/
2604
2605 static int
net2272_plat_probe(struct platform_device * pdev)2606 net2272_plat_probe(struct platform_device *pdev)
2607 {
2608 struct net2272 *dev;
2609 int ret;
2610 unsigned int irqflags;
2611 resource_size_t base, len;
2612 struct resource *iomem, *iomem_bus, *irq_res;
2613
2614 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
2615 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2616 iomem_bus = platform_get_resource(pdev, IORESOURCE_BUS, 0);
2617 if (!irq_res || !iomem) {
2618 dev_err(&pdev->dev, "must provide irq/base addr");
2619 return -EINVAL;
2620 }
2621
2622 dev = net2272_probe_init(&pdev->dev, irq_res->start);
2623 if (IS_ERR(dev))
2624 return PTR_ERR(dev);
2625
2626 irqflags = 0;
2627 if (irq_res->flags & IORESOURCE_IRQ_HIGHEDGE)
2628 irqflags |= IRQF_TRIGGER_RISING;
2629 if (irq_res->flags & IORESOURCE_IRQ_LOWEDGE)
2630 irqflags |= IRQF_TRIGGER_FALLING;
2631 if (irq_res->flags & IORESOURCE_IRQ_HIGHLEVEL)
2632 irqflags |= IRQF_TRIGGER_HIGH;
2633 if (irq_res->flags & IORESOURCE_IRQ_LOWLEVEL)
2634 irqflags |= IRQF_TRIGGER_LOW;
2635
2636 base = iomem->start;
2637 len = resource_size(iomem);
2638 if (iomem_bus)
2639 dev->base_shift = iomem_bus->start;
2640
2641 if (!request_mem_region(base, len, driver_name)) {
2642 dev_dbg(dev->dev, "get request memory region!\n");
2643 ret = -EBUSY;
2644 goto err;
2645 }
2646 dev->base_addr = ioremap(base, len);
2647 if (!dev->base_addr) {
2648 dev_dbg(dev->dev, "can't map memory\n");
2649 ret = -EFAULT;
2650 goto err_req;
2651 }
2652
2653 ret = net2272_probe_fin(dev, irqflags);
2654 if (ret)
2655 goto err_io;
2656
2657 platform_set_drvdata(pdev, dev);
2658 dev_info(&pdev->dev, "running in 16-bit, %sbyte swap local bus mode\n",
2659 (net2272_read(dev, LOCCTL) & (1 << BYTE_SWAP)) ? "" : "no ");
2660
2661 return 0;
2662
2663 err_io:
2664 iounmap(dev->base_addr);
2665 err_req:
2666 release_mem_region(base, len);
2667 err:
2668 usb_put_gadget(&dev->gadget);
2669
2670 return ret;
2671 }
2672
2673 static void
net2272_plat_remove(struct platform_device * pdev)2674 net2272_plat_remove(struct platform_device *pdev)
2675 {
2676 struct net2272 *dev = platform_get_drvdata(pdev);
2677
2678 net2272_remove(dev);
2679
2680 release_mem_region(pdev->resource[0].start,
2681 resource_size(&pdev->resource[0]));
2682
2683 usb_put_gadget(&dev->gadget);
2684 }
2685
2686 static struct platform_driver net2272_plat_driver = {
2687 .probe = net2272_plat_probe,
2688 .remove_new = net2272_plat_remove,
2689 .driver = {
2690 .name = driver_name,
2691 },
2692 /* FIXME .suspend, .resume */
2693 };
2694 MODULE_ALIAS("platform:net2272");
2695
net2272_init(void)2696 static int __init net2272_init(void)
2697 {
2698 int ret;
2699
2700 ret = net2272_pci_register();
2701 if (ret)
2702 return ret;
2703 ret = platform_driver_register(&net2272_plat_driver);
2704 if (ret)
2705 goto err_pci;
2706 return ret;
2707
2708 err_pci:
2709 net2272_pci_unregister();
2710 return ret;
2711 }
2712 module_init(net2272_init);
2713
net2272_cleanup(void)2714 static void __exit net2272_cleanup(void)
2715 {
2716 net2272_pci_unregister();
2717 platform_driver_unregister(&net2272_plat_driver);
2718 }
2719 module_exit(net2272_cleanup);
2720
2721 MODULE_DESCRIPTION(DRIVER_DESC);
2722 MODULE_AUTHOR("PLX Technology, Inc.");
2723 MODULE_LICENSE("GPL");
2724