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usb: gadget: net2280: physically disable endpoint on disable operation
[mirror_ubuntu-zesty-kernel.git] / drivers / usb / gadget / udc / net2280.c
1 /*
2 * Driver for the PLX NET2280 USB device controller.
3 * Specs and errata are available from <http://www.plxtech.com>.
4 *
5 * PLX Technology Inc. (formerly NetChip Technology) supported the
6 * development of this driver.
7 *
8 *
9 * CODE STATUS HIGHLIGHTS
10 *
11 * This driver should work well with most "gadget" drivers, including
12 * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
13 * as well as Gadget Zero and Gadgetfs.
14 *
15 * DMA is enabled by default.
16 *
17 * MSI is enabled by default. The legacy IRQ is used if MSI couldn't
18 * be enabled.
19 *
20 * Note that almost all the errata workarounds here are only needed for
21 * rev1 chips. Rev1a silicon (0110) fixes almost all of them.
22 */
23
24 /*
25 * Copyright (C) 2003 David Brownell
26 * Copyright (C) 2003-2005 PLX Technology, Inc.
27 * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
28 *
29 * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
30 * with 2282 chip
31 *
32 * Modified Ricardo Ribalda Qtechnology AS to provide compatibility
33 * with usb 338x chip. Based on PLX driver
34 *
35 * This program is free software; you can redistribute it and/or modify
36 * it under the terms of the GNU General Public License as published by
37 * the Free Software Foundation; either version 2 of the License, or
38 * (at your option) any later version.
39 */
40
41 #include <linux/module.h>
42 #include <linux/pci.h>
43 #include <linux/dma-mapping.h>
44 #include <linux/kernel.h>
45 #include <linux/delay.h>
46 #include <linux/ioport.h>
47 #include <linux/slab.h>
48 #include <linux/errno.h>
49 #include <linux/init.h>
50 #include <linux/timer.h>
51 #include <linux/list.h>
52 #include <linux/interrupt.h>
53 #include <linux/moduleparam.h>
54 #include <linux/device.h>
55 #include <linux/usb/ch9.h>
56 #include <linux/usb/gadget.h>
57 #include <linux/prefetch.h>
58 #include <linux/io.h>
59
60 #include <asm/byteorder.h>
61 #include <asm/irq.h>
62 #include <asm/unaligned.h>
63
64 #define DRIVER_DESC "PLX NET228x/USB338x USB Peripheral Controller"
65 #define DRIVER_VERSION "2005 Sept 27/v3.0"
66
67 #define EP_DONTUSE 13 /* nonzero */
68
69 #define USE_RDK_LEDS /* GPIO pins control three LEDs */
70
71
72 static const char driver_name[] = "net2280";
73 static const char driver_desc[] = DRIVER_DESC;
74
75 static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
76 static const char ep0name[] = "ep0";
77 static const char *const ep_name[] = {
78 ep0name,
79 "ep-a", "ep-b", "ep-c", "ep-d",
80 "ep-e", "ep-f", "ep-g", "ep-h",
81 };
82
83 /* Endpoint names for usb3380 advance mode */
84 static const char *const ep_name_adv[] = {
85 ep0name,
86 "ep1in", "ep2out", "ep3in", "ep4out",
87 "ep1out", "ep2in", "ep3out", "ep4in",
88 };
89
90 /* mode 0 == ep-{a,b,c,d} 1K fifo each
91 * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
92 * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
93 */
94 static ushort fifo_mode;
95
96 /* "modprobe net2280 fifo_mode=1" etc */
97 module_param(fifo_mode, ushort, 0644);
98
99 /* enable_suspend -- When enabled, the driver will respond to
100 * USB suspend requests by powering down the NET2280. Otherwise,
101 * USB suspend requests will be ignored. This is acceptable for
102 * self-powered devices
103 */
104 static bool enable_suspend;
105
106 /* "modprobe net2280 enable_suspend=1" etc */
107 module_param(enable_suspend, bool, 0444);
108
109 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
110
111 static char *type_string(u8 bmAttributes)
112 {
113 switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
114 case USB_ENDPOINT_XFER_BULK: return "bulk";
115 case USB_ENDPOINT_XFER_ISOC: return "iso";
116 case USB_ENDPOINT_XFER_INT: return "intr";
117 }
118 return "control";
119 }
120
121 #include "net2280.h"
122
123 #define valid_bit cpu_to_le32(BIT(VALID_BIT))
124 #define dma_done_ie cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
125
126 static void ep_clear_seqnum(struct net2280_ep *ep);
127
128 /*-------------------------------------------------------------------------*/
129 static inline void enable_pciirqenb(struct net2280_ep *ep)
130 {
131 u32 tmp = readl(&ep->dev->regs->pciirqenb0);
132
133 if (ep->dev->quirks & PLX_LEGACY)
134 tmp |= BIT(ep->num);
135 else
136 tmp |= BIT(ep_bit[ep->num]);
137 writel(tmp, &ep->dev->regs->pciirqenb0);
138
139 return;
140 }
141
142 static int
143 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
144 {
145 struct net2280 *dev;
146 struct net2280_ep *ep;
147 u32 max;
148 u32 tmp = 0;
149 u32 type;
150 unsigned long flags;
151 static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
152 int ret = 0;
153
154 ep = container_of(_ep, struct net2280_ep, ep);
155 if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
156 desc->bDescriptorType != USB_DT_ENDPOINT) {
157 pr_err("%s: failed at line=%d\n", __func__, __LINE__);
158 return -EINVAL;
159 }
160 dev = ep->dev;
161 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
162 ret = -ESHUTDOWN;
163 goto print_err;
164 }
165
166 /* erratum 0119 workaround ties up an endpoint number */
167 if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
168 ret = -EDOM;
169 goto print_err;
170 }
171
172 if (dev->quirks & PLX_SUPERSPEED) {
173 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
174 ret = -EDOM;
175 goto print_err;
176 }
177 ep->is_in = !!usb_endpoint_dir_in(desc);
178 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
179 ret = -EINVAL;
180 goto print_err;
181 }
182 }
183
184 /* sanity check ep-e/ep-f since their fifos are small */
185 max = usb_endpoint_maxp(desc) & 0x1fff;
186 if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
187 ret = -ERANGE;
188 goto print_err;
189 }
190
191 spin_lock_irqsave(&dev->lock, flags);
192 _ep->maxpacket = max & 0x7ff;
193 ep->desc = desc;
194
195 /* ep_reset() has already been called */
196 ep->stopped = 0;
197 ep->wedged = 0;
198 ep->out_overflow = 0;
199
200 /* set speed-dependent max packet; may kick in high bandwidth */
201 set_max_speed(ep, max);
202
203 /* set type, direction, address; reset fifo counters */
204 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
205
206 if ((dev->quirks & PLX_SUPERSPEED) && dev->enhanced_mode) {
207 tmp = readl(&ep->cfg->ep_cfg);
208 /* If USB ep number doesn't match hardware ep number */
209 if ((tmp & 0xf) != usb_endpoint_num(desc)) {
210 ret = -EINVAL;
211 spin_unlock_irqrestore(&dev->lock, flags);
212 goto print_err;
213 }
214 if (ep->is_in)
215 tmp &= ~USB3380_EP_CFG_MASK_IN;
216 else
217 tmp &= ~USB3380_EP_CFG_MASK_OUT;
218 }
219 type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
220 if (type == USB_ENDPOINT_XFER_INT) {
221 /* erratum 0105 workaround prevents hs NYET */
222 if (dev->chiprev == 0100 &&
223 dev->gadget.speed == USB_SPEED_HIGH &&
224 !(desc->bEndpointAddress & USB_DIR_IN))
225 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
226 &ep->regs->ep_rsp);
227 } else if (type == USB_ENDPOINT_XFER_BULK) {
228 /* catch some particularly blatant driver bugs */
229 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
230 (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
231 (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
232 spin_unlock_irqrestore(&dev->lock, flags);
233 ret = -ERANGE;
234 goto print_err;
235 }
236 }
237 ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
238 /* Enable this endpoint */
239 if (dev->quirks & PLX_LEGACY) {
240 tmp |= type << ENDPOINT_TYPE;
241 tmp |= desc->bEndpointAddress;
242 /* default full fifo lines */
243 tmp |= (4 << ENDPOINT_BYTE_COUNT);
244 tmp |= BIT(ENDPOINT_ENABLE);
245 ep->is_in = (tmp & USB_DIR_IN) != 0;
246 } else {
247 /* In Legacy mode, only OUT endpoints are used */
248 if (dev->enhanced_mode && ep->is_in) {
249 tmp |= type << IN_ENDPOINT_TYPE;
250 tmp |= BIT(IN_ENDPOINT_ENABLE);
251 } else {
252 tmp |= type << OUT_ENDPOINT_TYPE;
253 tmp |= BIT(OUT_ENDPOINT_ENABLE);
254 tmp |= (ep->is_in << ENDPOINT_DIRECTION);
255 }
256
257 tmp |= (4 << ENDPOINT_BYTE_COUNT);
258 if (!dev->enhanced_mode)
259 tmp |= usb_endpoint_num(desc);
260 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
261 }
262
263 /* Make sure all the registers are written before ep_rsp*/
264 wmb();
265
266 /* for OUT transfers, block the rx fifo until a read is posted */
267 if (!ep->is_in)
268 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
269 else if (!(dev->quirks & PLX_2280)) {
270 /* Added for 2282, Don't use nak packets on an in endpoint,
271 * this was ignored on 2280
272 */
273 writel(BIT(CLEAR_NAK_OUT_PACKETS) |
274 BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
275 }
276
277 if (dev->quirks & PLX_SUPERSPEED)
278 ep_clear_seqnum(ep);
279 writel(tmp, &ep->cfg->ep_cfg);
280
281 /* enable irqs */
282 if (!ep->dma) { /* pio, per-packet */
283 enable_pciirqenb(ep);
284
285 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
286 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
287 if (dev->quirks & PLX_2280)
288 tmp |= readl(&ep->regs->ep_irqenb);
289 writel(tmp, &ep->regs->ep_irqenb);
290 } else { /* dma, per-request */
291 tmp = BIT((8 + ep->num)); /* completion */
292 tmp |= readl(&dev->regs->pciirqenb1);
293 writel(tmp, &dev->regs->pciirqenb1);
294
295 /* for short OUT transfers, dma completions can't
296 * advance the queue; do it pio-style, by hand.
297 * NOTE erratum 0112 workaround #2
298 */
299 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
300 tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
301 writel(tmp, &ep->regs->ep_irqenb);
302
303 enable_pciirqenb(ep);
304 }
305 }
306
307 tmp = desc->bEndpointAddress;
308 ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
309 _ep->name, tmp & 0x0f, DIR_STRING(tmp),
310 type_string(desc->bmAttributes),
311 ep->dma ? "dma" : "pio", max);
312
313 /* pci writes may still be posted */
314 spin_unlock_irqrestore(&dev->lock, flags);
315 return ret;
316
317 print_err:
318 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
319 return ret;
320 }
321
322 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
323 {
324 u32 result;
325
326 do {
327 result = readl(ptr);
328 if (result == ~(u32)0) /* "device unplugged" */
329 return -ENODEV;
330 result &= mask;
331 if (result == done)
332 return 0;
333 udelay(1);
334 usec--;
335 } while (usec > 0);
336 return -ETIMEDOUT;
337 }
338
339 static const struct usb_ep_ops net2280_ep_ops;
340
341 static void ep_reset_228x(struct net2280_regs __iomem *regs,
342 struct net2280_ep *ep)
343 {
344 u32 tmp;
345
346 ep->desc = NULL;
347 INIT_LIST_HEAD(&ep->queue);
348
349 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
350 ep->ep.ops = &net2280_ep_ops;
351
352 /* disable the dma, irqs, endpoint... */
353 if (ep->dma) {
354 writel(0, &ep->dma->dmactl);
355 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
356 BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
357 BIT(DMA_ABORT),
358 &ep->dma->dmastat);
359
360 tmp = readl(&regs->pciirqenb0);
361 tmp &= ~BIT(ep->num);
362 writel(tmp, &regs->pciirqenb0);
363 } else {
364 tmp = readl(&regs->pciirqenb1);
365 tmp &= ~BIT((8 + ep->num)); /* completion */
366 writel(tmp, &regs->pciirqenb1);
367 }
368 writel(0, &ep->regs->ep_irqenb);
369
370 /* init to our chosen defaults, notably so that we NAK OUT
371 * packets until the driver queues a read (+note erratum 0112)
372 */
373 if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
374 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
375 BIT(SET_NAK_OUT_PACKETS) |
376 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
377 BIT(CLEAR_INTERRUPT_MODE);
378 } else {
379 /* added for 2282 */
380 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
381 BIT(CLEAR_NAK_OUT_PACKETS) |
382 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
383 BIT(CLEAR_INTERRUPT_MODE);
384 }
385
386 if (ep->num != 0) {
387 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
388 BIT(CLEAR_ENDPOINT_HALT);
389 }
390 writel(tmp, &ep->regs->ep_rsp);
391
392 /* scrub most status bits, and flush any fifo state */
393 if (ep->dev->quirks & PLX_2280)
394 tmp = BIT(FIFO_OVERFLOW) |
395 BIT(FIFO_UNDERFLOW);
396 else
397 tmp = 0;
398
399 writel(tmp | BIT(TIMEOUT) |
400 BIT(USB_STALL_SENT) |
401 BIT(USB_IN_NAK_SENT) |
402 BIT(USB_IN_ACK_RCVD) |
403 BIT(USB_OUT_PING_NAK_SENT) |
404 BIT(USB_OUT_ACK_SENT) |
405 BIT(FIFO_FLUSH) |
406 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
407 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
408 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
409 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
410 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
411 BIT(DATA_IN_TOKEN_INTERRUPT),
412 &ep->regs->ep_stat);
413
414 /* fifo size is handled separately */
415 }
416
417 static void ep_reset_338x(struct net2280_regs __iomem *regs,
418 struct net2280_ep *ep)
419 {
420 u32 tmp, dmastat;
421
422 ep->desc = NULL;
423 INIT_LIST_HEAD(&ep->queue);
424
425 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
426 ep->ep.ops = &net2280_ep_ops;
427
428 /* disable the dma, irqs, endpoint... */
429 if (ep->dma) {
430 writel(0, &ep->dma->dmactl);
431 writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
432 BIT(DMA_PAUSE_DONE_INTERRUPT) |
433 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
434 BIT(DMA_TRANSACTION_DONE_INTERRUPT),
435 /* | BIT(DMA_ABORT), */
436 &ep->dma->dmastat);
437
438 dmastat = readl(&ep->dma->dmastat);
439 if (dmastat == 0x5002) {
440 ep_warn(ep->dev, "The dmastat return = %x!!\n",
441 dmastat);
442 writel(0x5a, &ep->dma->dmastat);
443 }
444
445 tmp = readl(&regs->pciirqenb0);
446 tmp &= ~BIT(ep_bit[ep->num]);
447 writel(tmp, &regs->pciirqenb0);
448 } else {
449 if (ep->num < 5) {
450 tmp = readl(&regs->pciirqenb1);
451 tmp &= ~BIT((8 + ep->num)); /* completion */
452 writel(tmp, &regs->pciirqenb1);
453 }
454 }
455 writel(0, &ep->regs->ep_irqenb);
456
457 writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
458 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
459 BIT(FIFO_OVERFLOW) |
460 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
461 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
462 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
463 BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
464
465 tmp = readl(&ep->cfg->ep_cfg);
466 if (ep->is_in)
467 tmp &= ~USB3380_EP_CFG_MASK_IN;
468 else
469 tmp &= ~USB3380_EP_CFG_MASK_OUT;
470 writel(tmp, &ep->cfg->ep_cfg);
471 }
472
473 static void nuke(struct net2280_ep *);
474
475 static int net2280_disable(struct usb_ep *_ep)
476 {
477 struct net2280_ep *ep;
478 unsigned long flags;
479
480 ep = container_of(_ep, struct net2280_ep, ep);
481 if (!_ep || !ep->desc || _ep->name == ep0name) {
482 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
483 return -EINVAL;
484 }
485 spin_lock_irqsave(&ep->dev->lock, flags);
486 nuke(ep);
487
488 if (ep->dev->quirks & PLX_SUPERSPEED)
489 ep_reset_338x(ep->dev->regs, ep);
490 else
491 ep_reset_228x(ep->dev->regs, ep);
492
493 ep_vdbg(ep->dev, "disabled %s %s\n",
494 ep->dma ? "dma" : "pio", _ep->name);
495
496 /* synch memory views with the device */
497 (void)readl(&ep->cfg->ep_cfg);
498
499 if (!ep->dma && ep->num >= 1 && ep->num <= 4)
500 ep->dma = &ep->dev->dma[ep->num - 1];
501
502 spin_unlock_irqrestore(&ep->dev->lock, flags);
503 return 0;
504 }
505
506 /*-------------------------------------------------------------------------*/
507
508 static struct usb_request
509 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
510 {
511 struct net2280_ep *ep;
512 struct net2280_request *req;
513
514 if (!_ep) {
515 pr_err("%s: Invalid ep\n", __func__);
516 return NULL;
517 }
518 ep = container_of(_ep, struct net2280_ep, ep);
519
520 req = kzalloc(sizeof(*req), gfp_flags);
521 if (!req)
522 return NULL;
523
524 INIT_LIST_HEAD(&req->queue);
525
526 /* this dma descriptor may be swapped with the previous dummy */
527 if (ep->dma) {
528 struct net2280_dma *td;
529
530 td = pci_pool_alloc(ep->dev->requests, gfp_flags,
531 &req->td_dma);
532 if (!td) {
533 kfree(req);
534 return NULL;
535 }
536 td->dmacount = 0; /* not VALID */
537 td->dmadesc = td->dmaaddr;
538 req->td = td;
539 }
540 return &req->req;
541 }
542
543 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
544 {
545 struct net2280_ep *ep;
546 struct net2280_request *req;
547
548 ep = container_of(_ep, struct net2280_ep, ep);
549 if (!_ep || !_req) {
550 dev_err(&ep->dev->pdev->dev, "%s: Inavlid ep=%p or req=%p\n",
551 __func__, _ep, _req);
552 return;
553 }
554
555 req = container_of(_req, struct net2280_request, req);
556 WARN_ON(!list_empty(&req->queue));
557 if (req->td)
558 pci_pool_free(ep->dev->requests, req->td, req->td_dma);
559 kfree(req);
560 }
561
562 /*-------------------------------------------------------------------------*/
563
564 /* load a packet into the fifo we use for usb IN transfers.
565 * works for all endpoints.
566 *
567 * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
568 * at a time, but this code is simpler because it knows it only writes
569 * one packet. ep-a..ep-d should use dma instead.
570 */
571 static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
572 {
573 struct net2280_ep_regs __iomem *regs = ep->regs;
574 u8 *buf;
575 u32 tmp;
576 unsigned count, total;
577
578 /* INVARIANT: fifo is currently empty. (testable) */
579
580 if (req) {
581 buf = req->buf + req->actual;
582 prefetch(buf);
583 total = req->length - req->actual;
584 } else {
585 total = 0;
586 buf = NULL;
587 }
588
589 /* write just one packet at a time */
590 count = ep->ep.maxpacket;
591 if (count > total) /* min() cannot be used on a bitfield */
592 count = total;
593
594 ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
595 ep->ep.name, count,
596 (count != ep->ep.maxpacket) ? " (short)" : "",
597 req);
598 while (count >= 4) {
599 /* NOTE be careful if you try to align these. fifo lines
600 * should normally be full (4 bytes) and successive partial
601 * lines are ok only in certain cases.
602 */
603 tmp = get_unaligned((u32 *)buf);
604 cpu_to_le32s(&tmp);
605 writel(tmp, &regs->ep_data);
606 buf += 4;
607 count -= 4;
608 }
609
610 /* last fifo entry is "short" unless we wrote a full packet.
611 * also explicitly validate last word in (periodic) transfers
612 * when maxpacket is not a multiple of 4 bytes.
613 */
614 if (count || total < ep->ep.maxpacket) {
615 tmp = count ? get_unaligned((u32 *)buf) : count;
616 cpu_to_le32s(&tmp);
617 set_fifo_bytecount(ep, count & 0x03);
618 writel(tmp, &regs->ep_data);
619 }
620
621 /* pci writes may still be posted */
622 }
623
624 /* work around erratum 0106: PCI and USB race over the OUT fifo.
625 * caller guarantees chiprev 0100, out endpoint is NAKing, and
626 * there's no real data in the fifo.
627 *
628 * NOTE: also used in cases where that erratum doesn't apply:
629 * where the host wrote "too much" data to us.
630 */
631 static void out_flush(struct net2280_ep *ep)
632 {
633 u32 __iomem *statp;
634 u32 tmp;
635
636 statp = &ep->regs->ep_stat;
637
638 tmp = readl(statp);
639 if (tmp & BIT(NAK_OUT_PACKETS)) {
640 ep_dbg(ep->dev, "%s %s %08x !NAK\n",
641 ep->ep.name, __func__, tmp);
642 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
643 }
644
645 writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
646 BIT(DATA_PACKET_RECEIVED_INTERRUPT),
647 statp);
648 writel(BIT(FIFO_FLUSH), statp);
649 /* Make sure that stap is written */
650 mb();
651 tmp = readl(statp);
652 if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
653 /* high speed did bulk NYET; fifo isn't filling */
654 ep->dev->gadget.speed == USB_SPEED_FULL) {
655 unsigned usec;
656
657 usec = 50; /* 64 byte bulk/interrupt */
658 handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
659 BIT(USB_OUT_PING_NAK_SENT), usec);
660 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
661 }
662 }
663
664 /* unload packet(s) from the fifo we use for usb OUT transfers.
665 * returns true iff the request completed, because of short packet
666 * or the request buffer having filled with full packets.
667 *
668 * for ep-a..ep-d this will read multiple packets out when they
669 * have been accepted.
670 */
671 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
672 {
673 struct net2280_ep_regs __iomem *regs = ep->regs;
674 u8 *buf = req->req.buf + req->req.actual;
675 unsigned count, tmp, is_short;
676 unsigned cleanup = 0, prevent = 0;
677
678 /* erratum 0106 ... packets coming in during fifo reads might
679 * be incompletely rejected. not all cases have workarounds.
680 */
681 if (ep->dev->chiprev == 0x0100 &&
682 ep->dev->gadget.speed == USB_SPEED_FULL) {
683 udelay(1);
684 tmp = readl(&ep->regs->ep_stat);
685 if ((tmp & BIT(NAK_OUT_PACKETS)))
686 cleanup = 1;
687 else if ((tmp & BIT(FIFO_FULL))) {
688 start_out_naking(ep);
689 prevent = 1;
690 }
691 /* else: hope we don't see the problem */
692 }
693
694 /* never overflow the rx buffer. the fifo reads packets until
695 * it sees a short one; we might not be ready for them all.
696 */
697 prefetchw(buf);
698 count = readl(&regs->ep_avail);
699 if (unlikely(count == 0)) {
700 udelay(1);
701 tmp = readl(&ep->regs->ep_stat);
702 count = readl(&regs->ep_avail);
703 /* handled that data already? */
704 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
705 return 0;
706 }
707
708 tmp = req->req.length - req->req.actual;
709 if (count > tmp) {
710 /* as with DMA, data overflow gets flushed */
711 if ((tmp % ep->ep.maxpacket) != 0) {
712 ep_err(ep->dev,
713 "%s out fifo %d bytes, expected %d\n",
714 ep->ep.name, count, tmp);
715 req->req.status = -EOVERFLOW;
716 cleanup = 1;
717 /* NAK_OUT_PACKETS will be set, so flushing is safe;
718 * the next read will start with the next packet
719 */
720 } /* else it's a ZLP, no worries */
721 count = tmp;
722 }
723 req->req.actual += count;
724
725 is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
726
727 ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
728 ep->ep.name, count, is_short ? " (short)" : "",
729 cleanup ? " flush" : "", prevent ? " nak" : "",
730 req, req->req.actual, req->req.length);
731
732 while (count >= 4) {
733 tmp = readl(&regs->ep_data);
734 cpu_to_le32s(&tmp);
735 put_unaligned(tmp, (u32 *)buf);
736 buf += 4;
737 count -= 4;
738 }
739 if (count) {
740 tmp = readl(&regs->ep_data);
741 /* LE conversion is implicit here: */
742 do {
743 *buf++ = (u8) tmp;
744 tmp >>= 8;
745 } while (--count);
746 }
747 if (cleanup)
748 out_flush(ep);
749 if (prevent) {
750 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
751 (void) readl(&ep->regs->ep_rsp);
752 }
753
754 return is_short || ((req->req.actual == req->req.length) &&
755 !req->req.zero);
756 }
757
758 /* fill out dma descriptor to match a given request */
759 static void fill_dma_desc(struct net2280_ep *ep,
760 struct net2280_request *req, int valid)
761 {
762 struct net2280_dma *td = req->td;
763 u32 dmacount = req->req.length;
764
765 /* don't let DMA continue after a short OUT packet,
766 * so overruns can't affect the next transfer.
767 * in case of overruns on max-size packets, we can't
768 * stop the fifo from filling but we can flush it.
769 */
770 if (ep->is_in)
771 dmacount |= BIT(DMA_DIRECTION);
772 if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
773 !(ep->dev->quirks & PLX_2280))
774 dmacount |= BIT(END_OF_CHAIN);
775
776 req->valid = valid;
777 if (valid)
778 dmacount |= BIT(VALID_BIT);
779 dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
780
781 /* td->dmadesc = previously set by caller */
782 td->dmaaddr = cpu_to_le32 (req->req.dma);
783
784 /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
785 wmb();
786 td->dmacount = cpu_to_le32(dmacount);
787 }
788
789 static const u32 dmactl_default =
790 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
791 BIT(DMA_CLEAR_COUNT_ENABLE) |
792 /* erratum 0116 workaround part 1 (use POLLING) */
793 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
794 BIT(DMA_VALID_BIT_POLLING_ENABLE) |
795 BIT(DMA_VALID_BIT_ENABLE) |
796 BIT(DMA_SCATTER_GATHER_ENABLE) |
797 /* erratum 0116 workaround part 2 (no AUTOSTART) */
798 BIT(DMA_ENABLE);
799
800 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
801 {
802 handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
803 }
804
805 static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
806 {
807 writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
808 spin_stop_dma(dma);
809 }
810
811 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
812 {
813 struct net2280_dma_regs __iomem *dma = ep->dma;
814 unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
815
816 if (!(ep->dev->quirks & PLX_2280))
817 tmp |= BIT(END_OF_CHAIN);
818
819 writel(tmp, &dma->dmacount);
820 writel(readl(&dma->dmastat), &dma->dmastat);
821
822 writel(td_dma, &dma->dmadesc);
823 if (ep->dev->quirks & PLX_SUPERSPEED)
824 dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
825 writel(dmactl, &dma->dmactl);
826
827 /* erratum 0116 workaround part 3: pci arbiter away from net2280 */
828 (void) readl(&ep->dev->pci->pcimstctl);
829
830 writel(BIT(DMA_START), &dma->dmastat);
831
832 if (!ep->is_in)
833 stop_out_naking(ep);
834 }
835
836 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
837 {
838 u32 tmp;
839 struct net2280_dma_regs __iomem *dma = ep->dma;
840
841 /* FIXME can't use DMA for ZLPs */
842
843 /* on this path we "know" there's no dma active (yet) */
844 WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
845 writel(0, &ep->dma->dmactl);
846
847 /* previous OUT packet might have been short */
848 if (!ep->is_in && (readl(&ep->regs->ep_stat) &
849 BIT(NAK_OUT_PACKETS))) {
850 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
851 &ep->regs->ep_stat);
852
853 tmp = readl(&ep->regs->ep_avail);
854 if (tmp) {
855 writel(readl(&dma->dmastat), &dma->dmastat);
856
857 /* transfer all/some fifo data */
858 writel(req->req.dma, &dma->dmaaddr);
859 tmp = min(tmp, req->req.length);
860
861 /* dma irq, faking scatterlist status */
862 req->td->dmacount = cpu_to_le32(req->req.length - tmp);
863 writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
864 &dma->dmacount);
865 req->td->dmadesc = 0;
866 req->valid = 1;
867
868 writel(BIT(DMA_ENABLE), &dma->dmactl);
869 writel(BIT(DMA_START), &dma->dmastat);
870 return;
871 }
872 }
873
874 tmp = dmactl_default;
875
876 /* force packet boundaries between dma requests, but prevent the
877 * controller from automagically writing a last "short" packet
878 * (zero length) unless the driver explicitly said to do that.
879 */
880 if (ep->is_in) {
881 if (likely((req->req.length % ep->ep.maxpacket) ||
882 req->req.zero)){
883 tmp |= BIT(DMA_FIFO_VALIDATE);
884 ep->in_fifo_validate = 1;
885 } else
886 ep->in_fifo_validate = 0;
887 }
888
889 /* init req->td, pointing to the current dummy */
890 req->td->dmadesc = cpu_to_le32 (ep->td_dma);
891 fill_dma_desc(ep, req, 1);
892
893 req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
894
895 start_queue(ep, tmp, req->td_dma);
896 }
897
898 static inline void
899 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
900 {
901 struct net2280_dma *end;
902 dma_addr_t tmp;
903
904 /* swap new dummy for old, link; fill and maybe activate */
905 end = ep->dummy;
906 ep->dummy = req->td;
907 req->td = end;
908
909 tmp = ep->td_dma;
910 ep->td_dma = req->td_dma;
911 req->td_dma = tmp;
912
913 end->dmadesc = cpu_to_le32 (ep->td_dma);
914
915 fill_dma_desc(ep, req, valid);
916 }
917
918 static void
919 done(struct net2280_ep *ep, struct net2280_request *req, int status)
920 {
921 struct net2280 *dev;
922 unsigned stopped = ep->stopped;
923
924 list_del_init(&req->queue);
925
926 if (req->req.status == -EINPROGRESS)
927 req->req.status = status;
928 else
929 status = req->req.status;
930
931 dev = ep->dev;
932 if (ep->dma)
933 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
934
935 if (status && status != -ESHUTDOWN)
936 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
937 ep->ep.name, &req->req, status,
938 req->req.actual, req->req.length);
939
940 /* don't modify queue heads during completion callback */
941 ep->stopped = 1;
942 spin_unlock(&dev->lock);
943 usb_gadget_giveback_request(&ep->ep, &req->req);
944 spin_lock(&dev->lock);
945 ep->stopped = stopped;
946 }
947
948 /*-------------------------------------------------------------------------*/
949
950 static int
951 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
952 {
953 struct net2280_request *req;
954 struct net2280_ep *ep;
955 struct net2280 *dev;
956 unsigned long flags;
957 int ret = 0;
958
959 /* we always require a cpu-view buffer, so that we can
960 * always use pio (as fallback or whatever).
961 */
962 ep = container_of(_ep, struct net2280_ep, ep);
963 if (!_ep || (!ep->desc && ep->num != 0)) {
964 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
965 return -EINVAL;
966 }
967 req = container_of(_req, struct net2280_request, req);
968 if (!_req || !_req->complete || !_req->buf ||
969 !list_empty(&req->queue)) {
970 ret = -EINVAL;
971 goto print_err;
972 }
973 if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
974 ret = -EDOM;
975 goto print_err;
976 }
977 dev = ep->dev;
978 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
979 ret = -ESHUTDOWN;
980 goto print_err;
981 }
982
983 /* FIXME implement PIO fallback for ZLPs with DMA */
984 if (ep->dma && _req->length == 0) {
985 ret = -EOPNOTSUPP;
986 goto print_err;
987 }
988
989 /* set up dma mapping in case the caller didn't */
990 if (ep->dma) {
991 ret = usb_gadget_map_request(&dev->gadget, _req,
992 ep->is_in);
993 if (ret)
994 goto print_err;
995 }
996
997 ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
998 _ep->name, _req, _req->length, _req->buf);
999
1000 spin_lock_irqsave(&dev->lock, flags);
1001
1002 _req->status = -EINPROGRESS;
1003 _req->actual = 0;
1004
1005 /* kickstart this i/o queue? */
1006 if (list_empty(&ep->queue) && !ep->stopped &&
1007 !((dev->quirks & PLX_SUPERSPEED) && ep->dma &&
1008 (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1009
1010 /* use DMA if the endpoint supports it, else pio */
1011 if (ep->dma)
1012 start_dma(ep, req);
1013 else {
1014 /* maybe there's no control data, just status ack */
1015 if (ep->num == 0 && _req->length == 0) {
1016 allow_status(ep);
1017 done(ep, req, 0);
1018 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1019 goto done;
1020 }
1021
1022 /* PIO ... stuff the fifo, or unblock it. */
1023 if (ep->is_in)
1024 write_fifo(ep, _req);
1025 else if (list_empty(&ep->queue)) {
1026 u32 s;
1027
1028 /* OUT FIFO might have packet(s) buffered */
1029 s = readl(&ep->regs->ep_stat);
1030 if ((s & BIT(FIFO_EMPTY)) == 0) {
1031 /* note: _req->short_not_ok is
1032 * ignored here since PIO _always_
1033 * stops queue advance here, and
1034 * _req->status doesn't change for
1035 * short reads (only _req->actual)
1036 */
1037 if (read_fifo(ep, req) &&
1038 ep->num == 0) {
1039 done(ep, req, 0);
1040 allow_status(ep);
1041 /* don't queue it */
1042 req = NULL;
1043 } else if (read_fifo(ep, req) &&
1044 ep->num != 0) {
1045 done(ep, req, 0);
1046 req = NULL;
1047 } else
1048 s = readl(&ep->regs->ep_stat);
1049 }
1050
1051 /* don't NAK, let the fifo fill */
1052 if (req && (s & BIT(NAK_OUT_PACKETS)))
1053 writel(BIT(CLEAR_NAK_OUT_PACKETS),
1054 &ep->regs->ep_rsp);
1055 }
1056 }
1057
1058 } else if (ep->dma) {
1059 int valid = 1;
1060
1061 if (ep->is_in) {
1062 int expect;
1063
1064 /* preventing magic zlps is per-engine state, not
1065 * per-transfer; irq logic must recover hiccups.
1066 */
1067 expect = likely(req->req.zero ||
1068 (req->req.length % ep->ep.maxpacket));
1069 if (expect != ep->in_fifo_validate)
1070 valid = 0;
1071 }
1072 queue_dma(ep, req, valid);
1073
1074 } /* else the irq handler advances the queue. */
1075
1076 ep->responded = 1;
1077 if (req)
1078 list_add_tail(&req->queue, &ep->queue);
1079 done:
1080 spin_unlock_irqrestore(&dev->lock, flags);
1081
1082 /* pci writes may still be posted */
1083 return ret;
1084
1085 print_err:
1086 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1087 return ret;
1088 }
1089
1090 static inline void
1091 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1092 int status)
1093 {
1094 req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1095 done(ep, req, status);
1096 }
1097
1098 static void scan_dma_completions(struct net2280_ep *ep)
1099 {
1100 /* only look at descriptors that were "naturally" retired,
1101 * so fifo and list head state won't matter
1102 */
1103 while (!list_empty(&ep->queue)) {
1104 struct net2280_request *req;
1105 u32 tmp;
1106
1107 req = list_entry(ep->queue.next,
1108 struct net2280_request, queue);
1109 if (!req->valid)
1110 break;
1111 rmb();
1112 tmp = le32_to_cpup(&req->td->dmacount);
1113 if ((tmp & BIT(VALID_BIT)) != 0)
1114 break;
1115
1116 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1117 * cases where DMA must be aborted; this code handles
1118 * all non-abort DMA completions.
1119 */
1120 if (unlikely(req->td->dmadesc == 0)) {
1121 /* paranoia */
1122 tmp = readl(&ep->dma->dmacount);
1123 if (tmp & DMA_BYTE_COUNT_MASK)
1124 break;
1125 /* single transfer mode */
1126 dma_done(ep, req, tmp, 0);
1127 break;
1128 } else if (!ep->is_in &&
1129 (req->req.length % ep->ep.maxpacket) &&
1130 !(ep->dev->quirks & PLX_SUPERSPEED)) {
1131
1132 tmp = readl(&ep->regs->ep_stat);
1133 /* AVOID TROUBLE HERE by not issuing short reads from
1134 * your gadget driver. That helps avoids errata 0121,
1135 * 0122, and 0124; not all cases trigger the warning.
1136 */
1137 if ((tmp & BIT(NAK_OUT_PACKETS)) == 0) {
1138 ep_warn(ep->dev, "%s lost packet sync!\n",
1139 ep->ep.name);
1140 req->req.status = -EOVERFLOW;
1141 } else {
1142 tmp = readl(&ep->regs->ep_avail);
1143 if (tmp) {
1144 /* fifo gets flushed later */
1145 ep->out_overflow = 1;
1146 ep_dbg(ep->dev,
1147 "%s dma, discard %d len %d\n",
1148 ep->ep.name, tmp,
1149 req->req.length);
1150 req->req.status = -EOVERFLOW;
1151 }
1152 }
1153 }
1154 dma_done(ep, req, tmp, 0);
1155 }
1156 }
1157
1158 static void restart_dma(struct net2280_ep *ep)
1159 {
1160 struct net2280_request *req;
1161
1162 if (ep->stopped)
1163 return;
1164 req = list_entry(ep->queue.next, struct net2280_request, queue);
1165
1166 start_dma(ep, req);
1167 }
1168
1169 static void abort_dma(struct net2280_ep *ep)
1170 {
1171 /* abort the current transfer */
1172 if (likely(!list_empty(&ep->queue))) {
1173 /* FIXME work around errata 0121, 0122, 0124 */
1174 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1175 spin_stop_dma(ep->dma);
1176 } else
1177 stop_dma(ep->dma);
1178 scan_dma_completions(ep);
1179 }
1180
1181 /* dequeue ALL requests */
1182 static void nuke(struct net2280_ep *ep)
1183 {
1184 struct net2280_request *req;
1185
1186 /* called with spinlock held */
1187 ep->stopped = 1;
1188 if (ep->dma)
1189 abort_dma(ep);
1190 while (!list_empty(&ep->queue)) {
1191 req = list_entry(ep->queue.next,
1192 struct net2280_request,
1193 queue);
1194 done(ep, req, -ESHUTDOWN);
1195 }
1196 }
1197
1198 /* dequeue JUST ONE request */
1199 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1200 {
1201 struct net2280_ep *ep;
1202 struct net2280_request *req;
1203 unsigned long flags;
1204 u32 dmactl;
1205 int stopped;
1206
1207 ep = container_of(_ep, struct net2280_ep, ep);
1208 if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1209 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1210 __func__, _ep, _req);
1211 return -EINVAL;
1212 }
1213
1214 spin_lock_irqsave(&ep->dev->lock, flags);
1215 stopped = ep->stopped;
1216
1217 /* quiesce dma while we patch the queue */
1218 dmactl = 0;
1219 ep->stopped = 1;
1220 if (ep->dma) {
1221 dmactl = readl(&ep->dma->dmactl);
1222 /* WARNING erratum 0127 may kick in ... */
1223 stop_dma(ep->dma);
1224 scan_dma_completions(ep);
1225 }
1226
1227 /* make sure it's still queued on this endpoint */
1228 list_for_each_entry(req, &ep->queue, queue) {
1229 if (&req->req == _req)
1230 break;
1231 }
1232 if (&req->req != _req) {
1233 spin_unlock_irqrestore(&ep->dev->lock, flags);
1234 dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
1235 __func__);
1236 return -EINVAL;
1237 }
1238
1239 /* queue head may be partially complete. */
1240 if (ep->queue.next == &req->queue) {
1241 if (ep->dma) {
1242 ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1243 _req->status = -ECONNRESET;
1244 abort_dma(ep);
1245 if (likely(ep->queue.next == &req->queue)) {
1246 /* NOTE: misreports single-transfer mode*/
1247 req->td->dmacount = 0; /* invalidate */
1248 dma_done(ep, req,
1249 readl(&ep->dma->dmacount),
1250 -ECONNRESET);
1251 }
1252 } else {
1253 ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1254 done(ep, req, -ECONNRESET);
1255 }
1256 req = NULL;
1257 }
1258
1259 if (req)
1260 done(ep, req, -ECONNRESET);
1261 ep->stopped = stopped;
1262
1263 if (ep->dma) {
1264 /* turn off dma on inactive queues */
1265 if (list_empty(&ep->queue))
1266 stop_dma(ep->dma);
1267 else if (!ep->stopped) {
1268 /* resume current request, or start new one */
1269 if (req)
1270 writel(dmactl, &ep->dma->dmactl);
1271 else
1272 start_dma(ep, list_entry(ep->queue.next,
1273 struct net2280_request, queue));
1274 }
1275 }
1276
1277 spin_unlock_irqrestore(&ep->dev->lock, flags);
1278 return 0;
1279 }
1280
1281 /*-------------------------------------------------------------------------*/
1282
1283 static int net2280_fifo_status(struct usb_ep *_ep);
1284
1285 static int
1286 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1287 {
1288 struct net2280_ep *ep;
1289 unsigned long flags;
1290 int retval = 0;
1291
1292 ep = container_of(_ep, struct net2280_ep, ep);
1293 if (!_ep || (!ep->desc && ep->num != 0)) {
1294 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1295 return -EINVAL;
1296 }
1297 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1298 retval = -ESHUTDOWN;
1299 goto print_err;
1300 }
1301 if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1302 == USB_ENDPOINT_XFER_ISOC) {
1303 retval = -EINVAL;
1304 goto print_err;
1305 }
1306
1307 spin_lock_irqsave(&ep->dev->lock, flags);
1308 if (!list_empty(&ep->queue)) {
1309 retval = -EAGAIN;
1310 goto print_unlock;
1311 } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1312 retval = -EAGAIN;
1313 goto print_unlock;
1314 } else {
1315 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1316 value ? "set" : "clear",
1317 wedged ? "wedge" : "halt");
1318 /* set/clear, then synch memory views with the device */
1319 if (value) {
1320 if (ep->num == 0)
1321 ep->dev->protocol_stall = 1;
1322 else
1323 set_halt(ep);
1324 if (wedged)
1325 ep->wedged = 1;
1326 } else {
1327 clear_halt(ep);
1328 if (ep->dev->quirks & PLX_SUPERSPEED &&
1329 !list_empty(&ep->queue) && ep->td_dma)
1330 restart_dma(ep);
1331 ep->wedged = 0;
1332 }
1333 (void) readl(&ep->regs->ep_rsp);
1334 }
1335 spin_unlock_irqrestore(&ep->dev->lock, flags);
1336
1337 return retval;
1338
1339 print_unlock:
1340 spin_unlock_irqrestore(&ep->dev->lock, flags);
1341 print_err:
1342 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1343 return retval;
1344 }
1345
1346 static int net2280_set_halt(struct usb_ep *_ep, int value)
1347 {
1348 return net2280_set_halt_and_wedge(_ep, value, 0);
1349 }
1350
1351 static int net2280_set_wedge(struct usb_ep *_ep)
1352 {
1353 if (!_ep || _ep->name == ep0name) {
1354 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1355 return -EINVAL;
1356 }
1357 return net2280_set_halt_and_wedge(_ep, 1, 1);
1358 }
1359
1360 static int net2280_fifo_status(struct usb_ep *_ep)
1361 {
1362 struct net2280_ep *ep;
1363 u32 avail;
1364
1365 ep = container_of(_ep, struct net2280_ep, ep);
1366 if (!_ep || (!ep->desc && ep->num != 0)) {
1367 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1368 return -ENODEV;
1369 }
1370 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1371 dev_err(&ep->dev->pdev->dev,
1372 "%s: Invalid driver=%p or speed=%d\n",
1373 __func__, ep->dev->driver, ep->dev->gadget.speed);
1374 return -ESHUTDOWN;
1375 }
1376
1377 avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1378 if (avail > ep->fifo_size) {
1379 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1380 return -EOVERFLOW;
1381 }
1382 if (ep->is_in)
1383 avail = ep->fifo_size - avail;
1384 return avail;
1385 }
1386
1387 static void net2280_fifo_flush(struct usb_ep *_ep)
1388 {
1389 struct net2280_ep *ep;
1390
1391 ep = container_of(_ep, struct net2280_ep, ep);
1392 if (!_ep || (!ep->desc && ep->num != 0)) {
1393 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1394 return;
1395 }
1396 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1397 dev_err(&ep->dev->pdev->dev,
1398 "%s: Invalid driver=%p or speed=%d\n",
1399 __func__, ep->dev->driver, ep->dev->gadget.speed);
1400 return;
1401 }
1402
1403 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1404 (void) readl(&ep->regs->ep_rsp);
1405 }
1406
1407 static const struct usb_ep_ops net2280_ep_ops = {
1408 .enable = net2280_enable,
1409 .disable = net2280_disable,
1410
1411 .alloc_request = net2280_alloc_request,
1412 .free_request = net2280_free_request,
1413
1414 .queue = net2280_queue,
1415 .dequeue = net2280_dequeue,
1416
1417 .set_halt = net2280_set_halt,
1418 .set_wedge = net2280_set_wedge,
1419 .fifo_status = net2280_fifo_status,
1420 .fifo_flush = net2280_fifo_flush,
1421 };
1422
1423 /*-------------------------------------------------------------------------*/
1424
1425 static int net2280_get_frame(struct usb_gadget *_gadget)
1426 {
1427 struct net2280 *dev;
1428 unsigned long flags;
1429 u16 retval;
1430
1431 if (!_gadget)
1432 return -ENODEV;
1433 dev = container_of(_gadget, struct net2280, gadget);
1434 spin_lock_irqsave(&dev->lock, flags);
1435 retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1436 spin_unlock_irqrestore(&dev->lock, flags);
1437 return retval;
1438 }
1439
1440 static int net2280_wakeup(struct usb_gadget *_gadget)
1441 {
1442 struct net2280 *dev;
1443 u32 tmp;
1444 unsigned long flags;
1445
1446 if (!_gadget)
1447 return 0;
1448 dev = container_of(_gadget, struct net2280, gadget);
1449
1450 spin_lock_irqsave(&dev->lock, flags);
1451 tmp = readl(&dev->usb->usbctl);
1452 if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1453 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1454 spin_unlock_irqrestore(&dev->lock, flags);
1455
1456 /* pci writes may still be posted */
1457 return 0;
1458 }
1459
1460 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1461 {
1462 struct net2280 *dev;
1463 u32 tmp;
1464 unsigned long flags;
1465
1466 if (!_gadget)
1467 return 0;
1468 dev = container_of(_gadget, struct net2280, gadget);
1469
1470 spin_lock_irqsave(&dev->lock, flags);
1471 tmp = readl(&dev->usb->usbctl);
1472 if (value) {
1473 tmp |= BIT(SELF_POWERED_STATUS);
1474 _gadget->is_selfpowered = 1;
1475 } else {
1476 tmp &= ~BIT(SELF_POWERED_STATUS);
1477 _gadget->is_selfpowered = 0;
1478 }
1479 writel(tmp, &dev->usb->usbctl);
1480 spin_unlock_irqrestore(&dev->lock, flags);
1481
1482 return 0;
1483 }
1484
1485 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1486 {
1487 struct net2280 *dev;
1488 u32 tmp;
1489 unsigned long flags;
1490
1491 if (!_gadget)
1492 return -ENODEV;
1493 dev = container_of(_gadget, struct net2280, gadget);
1494
1495 spin_lock_irqsave(&dev->lock, flags);
1496 tmp = readl(&dev->usb->usbctl);
1497 dev->softconnect = (is_on != 0);
1498 if (is_on)
1499 tmp |= BIT(USB_DETECT_ENABLE);
1500 else
1501 tmp &= ~BIT(USB_DETECT_ENABLE);
1502 writel(tmp, &dev->usb->usbctl);
1503 spin_unlock_irqrestore(&dev->lock, flags);
1504
1505 return 0;
1506 }
1507
1508 static int net2280_start(struct usb_gadget *_gadget,
1509 struct usb_gadget_driver *driver);
1510 static int net2280_stop(struct usb_gadget *_gadget);
1511
1512 static const struct usb_gadget_ops net2280_ops = {
1513 .get_frame = net2280_get_frame,
1514 .wakeup = net2280_wakeup,
1515 .set_selfpowered = net2280_set_selfpowered,
1516 .pullup = net2280_pullup,
1517 .udc_start = net2280_start,
1518 .udc_stop = net2280_stop,
1519 };
1520
1521 /*-------------------------------------------------------------------------*/
1522
1523 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1524
1525 /* FIXME move these into procfs, and use seq_file.
1526 * Sysfs _still_ doesn't behave for arbitrarily sized files,
1527 * and also doesn't help products using this with 2.4 kernels.
1528 */
1529
1530 /* "function" sysfs attribute */
1531 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1532 char *buf)
1533 {
1534 struct net2280 *dev = dev_get_drvdata(_dev);
1535
1536 if (!dev->driver || !dev->driver->function ||
1537 strlen(dev->driver->function) > PAGE_SIZE)
1538 return 0;
1539 return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1540 }
1541 static DEVICE_ATTR_RO(function);
1542
1543 static ssize_t registers_show(struct device *_dev,
1544 struct device_attribute *attr, char *buf)
1545 {
1546 struct net2280 *dev;
1547 char *next;
1548 unsigned size, t;
1549 unsigned long flags;
1550 int i;
1551 u32 t1, t2;
1552 const char *s;
1553
1554 dev = dev_get_drvdata(_dev);
1555 next = buf;
1556 size = PAGE_SIZE;
1557 spin_lock_irqsave(&dev->lock, flags);
1558
1559 if (dev->driver)
1560 s = dev->driver->driver.name;
1561 else
1562 s = "(none)";
1563
1564 /* Main Control Registers */
1565 t = scnprintf(next, size, "%s version " DRIVER_VERSION
1566 ", chiprev %04x\n\n"
1567 "devinit %03x fifoctl %08x gadget '%s'\n"
1568 "pci irqenb0 %02x irqenb1 %08x "
1569 "irqstat0 %04x irqstat1 %08x\n",
1570 driver_name, dev->chiprev,
1571 readl(&dev->regs->devinit),
1572 readl(&dev->regs->fifoctl),
1573 s,
1574 readl(&dev->regs->pciirqenb0),
1575 readl(&dev->regs->pciirqenb1),
1576 readl(&dev->regs->irqstat0),
1577 readl(&dev->regs->irqstat1));
1578 size -= t;
1579 next += t;
1580
1581 /* USB Control Registers */
1582 t1 = readl(&dev->usb->usbctl);
1583 t2 = readl(&dev->usb->usbstat);
1584 if (t1 & BIT(VBUS_PIN)) {
1585 if (t2 & BIT(HIGH_SPEED))
1586 s = "high speed";
1587 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1588 s = "powered";
1589 else
1590 s = "full speed";
1591 /* full speed bit (6) not working?? */
1592 } else
1593 s = "not attached";
1594 t = scnprintf(next, size,
1595 "stdrsp %08x usbctl %08x usbstat %08x "
1596 "addr 0x%02x (%s)\n",
1597 readl(&dev->usb->stdrsp), t1, t2,
1598 readl(&dev->usb->ouraddr), s);
1599 size -= t;
1600 next += t;
1601
1602 /* PCI Master Control Registers */
1603
1604 /* DMA Control Registers */
1605
1606 /* Configurable EP Control Registers */
1607 for (i = 0; i < dev->n_ep; i++) {
1608 struct net2280_ep *ep;
1609
1610 ep = &dev->ep[i];
1611 if (i && !ep->desc)
1612 continue;
1613
1614 t1 = readl(&ep->cfg->ep_cfg);
1615 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1616 t = scnprintf(next, size,
1617 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1618 "irqenb %02x\n",
1619 ep->ep.name, t1, t2,
1620 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1621 ? "NAK " : "",
1622 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1623 ? "hide " : "",
1624 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1625 ? "CRC " : "",
1626 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1627 ? "interrupt " : "",
1628 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1629 ? "status " : "",
1630 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1631 ? "NAKmode " : "",
1632 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1633 ? "DATA1 " : "DATA0 ",
1634 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1635 ? "HALT " : "",
1636 readl(&ep->regs->ep_irqenb));
1637 size -= t;
1638 next += t;
1639
1640 t = scnprintf(next, size,
1641 "\tstat %08x avail %04x "
1642 "(ep%d%s-%s)%s\n",
1643 readl(&ep->regs->ep_stat),
1644 readl(&ep->regs->ep_avail),
1645 t1 & 0x0f, DIR_STRING(t1),
1646 type_string(t1 >> 8),
1647 ep->stopped ? "*" : "");
1648 size -= t;
1649 next += t;
1650
1651 if (!ep->dma)
1652 continue;
1653
1654 t = scnprintf(next, size,
1655 " dma\tctl %08x stat %08x count %08x\n"
1656 "\taddr %08x desc %08x\n",
1657 readl(&ep->dma->dmactl),
1658 readl(&ep->dma->dmastat),
1659 readl(&ep->dma->dmacount),
1660 readl(&ep->dma->dmaaddr),
1661 readl(&ep->dma->dmadesc));
1662 size -= t;
1663 next += t;
1664
1665 }
1666
1667 /* Indexed Registers (none yet) */
1668
1669 /* Statistics */
1670 t = scnprintf(next, size, "\nirqs: ");
1671 size -= t;
1672 next += t;
1673 for (i = 0; i < dev->n_ep; i++) {
1674 struct net2280_ep *ep;
1675
1676 ep = &dev->ep[i];
1677 if (i && !ep->irqs)
1678 continue;
1679 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1680 size -= t;
1681 next += t;
1682
1683 }
1684 t = scnprintf(next, size, "\n");
1685 size -= t;
1686 next += t;
1687
1688 spin_unlock_irqrestore(&dev->lock, flags);
1689
1690 return PAGE_SIZE - size;
1691 }
1692 static DEVICE_ATTR_RO(registers);
1693
1694 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1695 char *buf)
1696 {
1697 struct net2280 *dev;
1698 char *next;
1699 unsigned size;
1700 unsigned long flags;
1701 int i;
1702
1703 dev = dev_get_drvdata(_dev);
1704 next = buf;
1705 size = PAGE_SIZE;
1706 spin_lock_irqsave(&dev->lock, flags);
1707
1708 for (i = 0; i < dev->n_ep; i++) {
1709 struct net2280_ep *ep = &dev->ep[i];
1710 struct net2280_request *req;
1711 int t;
1712
1713 if (i != 0) {
1714 const struct usb_endpoint_descriptor *d;
1715
1716 d = ep->desc;
1717 if (!d)
1718 continue;
1719 t = d->bEndpointAddress;
1720 t = scnprintf(next, size,
1721 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1722 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1723 (t & USB_DIR_IN) ? "in" : "out",
1724 type_string(d->bmAttributes),
1725 usb_endpoint_maxp(d) & 0x1fff,
1726 ep->dma ? "dma" : "pio", ep->fifo_size
1727 );
1728 } else /* ep0 should only have one transfer queued */
1729 t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1730 ep->is_in ? "in" : "out");
1731 if (t <= 0 || t > size)
1732 goto done;
1733 size -= t;
1734 next += t;
1735
1736 if (list_empty(&ep->queue)) {
1737 t = scnprintf(next, size, "\t(nothing queued)\n");
1738 if (t <= 0 || t > size)
1739 goto done;
1740 size -= t;
1741 next += t;
1742 continue;
1743 }
1744 list_for_each_entry(req, &ep->queue, queue) {
1745 if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1746 t = scnprintf(next, size,
1747 "\treq %p len %d/%d "
1748 "buf %p (dmacount %08x)\n",
1749 &req->req, req->req.actual,
1750 req->req.length, req->req.buf,
1751 readl(&ep->dma->dmacount));
1752 else
1753 t = scnprintf(next, size,
1754 "\treq %p len %d/%d buf %p\n",
1755 &req->req, req->req.actual,
1756 req->req.length, req->req.buf);
1757 if (t <= 0 || t > size)
1758 goto done;
1759 size -= t;
1760 next += t;
1761
1762 if (ep->dma) {
1763 struct net2280_dma *td;
1764
1765 td = req->td;
1766 t = scnprintf(next, size, "\t td %08x "
1767 " count %08x buf %08x desc %08x\n",
1768 (u32) req->td_dma,
1769 le32_to_cpu(td->dmacount),
1770 le32_to_cpu(td->dmaaddr),
1771 le32_to_cpu(td->dmadesc));
1772 if (t <= 0 || t > size)
1773 goto done;
1774 size -= t;
1775 next += t;
1776 }
1777 }
1778 }
1779
1780 done:
1781 spin_unlock_irqrestore(&dev->lock, flags);
1782 return PAGE_SIZE - size;
1783 }
1784 static DEVICE_ATTR_RO(queues);
1785
1786
1787 #else
1788
1789 #define device_create_file(a, b) (0)
1790 #define device_remove_file(a, b) do { } while (0)
1791
1792 #endif
1793
1794 /*-------------------------------------------------------------------------*/
1795
1796 /* another driver-specific mode might be a request type doing dma
1797 * to/from another device fifo instead of to/from memory.
1798 */
1799
1800 static void set_fifo_mode(struct net2280 *dev, int mode)
1801 {
1802 /* keeping high bits preserves BAR2 */
1803 writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1804
1805 /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1806 INIT_LIST_HEAD(&dev->gadget.ep_list);
1807 list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1808 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1809 switch (mode) {
1810 case 0:
1811 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1812 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1813 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1814 break;
1815 case 1:
1816 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1817 break;
1818 case 2:
1819 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1820 dev->ep[1].fifo_size = 2048;
1821 dev->ep[2].fifo_size = 1024;
1822 break;
1823 }
1824 /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1825 list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1826 list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1827 }
1828
1829 static void defect7374_disable_data_eps(struct net2280 *dev)
1830 {
1831 /*
1832 * For Defect 7374, disable data EPs (and more):
1833 * - This phase undoes the earlier phase of the Defect 7374 workaround,
1834 * returing ep regs back to normal.
1835 */
1836 struct net2280_ep *ep;
1837 int i;
1838 unsigned char ep_sel;
1839 u32 tmp_reg;
1840
1841 for (i = 1; i < 5; i++) {
1842 ep = &dev->ep[i];
1843 writel(0, &ep->cfg->ep_cfg);
1844 }
1845
1846 /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1847 for (i = 0; i < 6; i++)
1848 writel(0, &dev->dep[i].dep_cfg);
1849
1850 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1851 /* Select an endpoint for subsequent operations: */
1852 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1853 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1854
1855 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1856 ep_sel == 18 || ep_sel == 20)
1857 continue;
1858
1859 /* Change settings on some selected endpoints */
1860 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1861 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1862 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1863 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1864 tmp_reg |= BIT(EP_INITIALIZED);
1865 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1866 }
1867 }
1868
1869 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1870 {
1871 u32 tmp = 0, tmp_reg;
1872 u32 scratch;
1873 int i;
1874 unsigned char ep_sel;
1875
1876 scratch = get_idx_reg(dev->regs, SCRATCH);
1877
1878 WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1879 == DEFECT7374_FSM_SS_CONTROL_READ);
1880
1881 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1882
1883 ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1884 ep_warn(dev, "It will operate on cold-reboot and SS connect");
1885
1886 /*GPEPs:*/
1887 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
1888 (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
1889 ((dev->enhanced_mode) ?
1890 BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
1891 BIT(ENDPOINT_ENABLE)));
1892
1893 for (i = 1; i < 5; i++)
1894 writel(tmp, &dev->ep[i].cfg->ep_cfg);
1895
1896 /* CSRIN, PCIIN, STATIN, RCIN*/
1897 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
1898 writel(tmp, &dev->dep[1].dep_cfg);
1899 writel(tmp, &dev->dep[3].dep_cfg);
1900 writel(tmp, &dev->dep[4].dep_cfg);
1901 writel(tmp, &dev->dep[5].dep_cfg);
1902
1903 /*Implemented for development and debug.
1904 * Can be refined/tuned later.*/
1905 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1906 /* Select an endpoint for subsequent operations: */
1907 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1908 writel(((tmp_reg & ~0x1f) | ep_sel),
1909 &dev->plregs->pl_ep_ctrl);
1910
1911 if (ep_sel == 1) {
1912 tmp =
1913 (readl(&dev->plregs->pl_ep_ctrl) |
1914 BIT(CLEAR_ACK_ERROR_CODE) | 0);
1915 writel(tmp, &dev->plregs->pl_ep_ctrl);
1916 continue;
1917 }
1918
1919 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
1920 ep_sel == 18 || ep_sel == 20)
1921 continue;
1922
1923 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
1924 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
1925 writel(tmp, &dev->plregs->pl_ep_cfg_4);
1926
1927 tmp = readl(&dev->plregs->pl_ep_ctrl) &
1928 ~BIT(EP_INITIALIZED);
1929 writel(tmp, &dev->plregs->pl_ep_ctrl);
1930
1931 }
1932
1933 /* Set FSM to focus on the first Control Read:
1934 * - Tip: Connection speed is known upon the first
1935 * setup request.*/
1936 scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
1937 set_idx_reg(dev->regs, SCRATCH, scratch);
1938
1939 }
1940
1941 /* keeping it simple:
1942 * - one bus driver, initted first;
1943 * - one function driver, initted second
1944 *
1945 * most of the work to support multiple net2280 controllers would
1946 * be to associate this gadget driver (yes?) with all of them, or
1947 * perhaps to bind specific drivers to specific devices.
1948 */
1949
1950 static void usb_reset_228x(struct net2280 *dev)
1951 {
1952 u32 tmp;
1953
1954 dev->gadget.speed = USB_SPEED_UNKNOWN;
1955 (void) readl(&dev->usb->usbctl);
1956
1957 net2280_led_init(dev);
1958
1959 /* disable automatic responses, and irqs */
1960 writel(0, &dev->usb->stdrsp);
1961 writel(0, &dev->regs->pciirqenb0);
1962 writel(0, &dev->regs->pciirqenb1);
1963
1964 /* clear old dma and irq state */
1965 for (tmp = 0; tmp < 4; tmp++) {
1966 struct net2280_ep *ep = &dev->ep[tmp + 1];
1967 if (ep->dma)
1968 abort_dma(ep);
1969 }
1970
1971 writel(~0, &dev->regs->irqstat0),
1972 writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
1973
1974 /* reset, and enable pci */
1975 tmp = readl(&dev->regs->devinit) |
1976 BIT(PCI_ENABLE) |
1977 BIT(FIFO_SOFT_RESET) |
1978 BIT(USB_SOFT_RESET) |
1979 BIT(M8051_RESET);
1980 writel(tmp, &dev->regs->devinit);
1981
1982 /* standard fifo and endpoint allocations */
1983 set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
1984 }
1985
1986 static void usb_reset_338x(struct net2280 *dev)
1987 {
1988 u32 tmp;
1989
1990 dev->gadget.speed = USB_SPEED_UNKNOWN;
1991 (void)readl(&dev->usb->usbctl);
1992
1993 net2280_led_init(dev);
1994
1995 if (dev->bug7734_patched) {
1996 /* disable automatic responses, and irqs */
1997 writel(0, &dev->usb->stdrsp);
1998 writel(0, &dev->regs->pciirqenb0);
1999 writel(0, &dev->regs->pciirqenb1);
2000 }
2001
2002 /* clear old dma and irq state */
2003 for (tmp = 0; tmp < 4; tmp++) {
2004 struct net2280_ep *ep = &dev->ep[tmp + 1];
2005 struct net2280_dma_regs __iomem *dma;
2006
2007 if (ep->dma) {
2008 abort_dma(ep);
2009 } else {
2010 dma = &dev->dma[tmp];
2011 writel(BIT(DMA_ABORT), &dma->dmastat);
2012 writel(0, &dma->dmactl);
2013 }
2014 }
2015
2016 writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2017
2018 if (dev->bug7734_patched) {
2019 /* reset, and enable pci */
2020 tmp = readl(&dev->regs->devinit) |
2021 BIT(PCI_ENABLE) |
2022 BIT(FIFO_SOFT_RESET) |
2023 BIT(USB_SOFT_RESET) |
2024 BIT(M8051_RESET);
2025
2026 writel(tmp, &dev->regs->devinit);
2027 }
2028
2029 /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2030 INIT_LIST_HEAD(&dev->gadget.ep_list);
2031
2032 for (tmp = 1; tmp < dev->n_ep; tmp++)
2033 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2034
2035 }
2036
2037 static void usb_reset(struct net2280 *dev)
2038 {
2039 if (dev->quirks & PLX_LEGACY)
2040 return usb_reset_228x(dev);
2041 return usb_reset_338x(dev);
2042 }
2043
2044 static void usb_reinit_228x(struct net2280 *dev)
2045 {
2046 u32 tmp;
2047
2048 /* basic endpoint init */
2049 for (tmp = 0; tmp < 7; tmp++) {
2050 struct net2280_ep *ep = &dev->ep[tmp];
2051
2052 ep->ep.name = ep_name[tmp];
2053 ep->dev = dev;
2054 ep->num = tmp;
2055
2056 if (tmp > 0 && tmp <= 4) {
2057 ep->fifo_size = 1024;
2058 ep->dma = &dev->dma[tmp - 1];
2059 } else
2060 ep->fifo_size = 64;
2061 ep->regs = &dev->epregs[tmp];
2062 ep->cfg = &dev->epregs[tmp];
2063 ep_reset_228x(dev->regs, ep);
2064 }
2065 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2066 usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2067 usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2068
2069 dev->gadget.ep0 = &dev->ep[0].ep;
2070 dev->ep[0].stopped = 0;
2071 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2072
2073 /* we want to prevent lowlevel/insecure access from the USB host,
2074 * but erratum 0119 means this enable bit is ignored
2075 */
2076 for (tmp = 0; tmp < 5; tmp++)
2077 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2078 }
2079
2080 static void usb_reinit_338x(struct net2280 *dev)
2081 {
2082 int i;
2083 u32 tmp, val;
2084 static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2085 static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2086 0x00, 0xC0, 0x00, 0xC0 };
2087
2088 /* basic endpoint init */
2089 for (i = 0; i < dev->n_ep; i++) {
2090 struct net2280_ep *ep = &dev->ep[i];
2091
2092 ep->ep.name = dev->enhanced_mode ? ep_name_adv[i] : ep_name[i];
2093 ep->dev = dev;
2094 ep->num = i;
2095
2096 if (i > 0 && i <= 4)
2097 ep->dma = &dev->dma[i - 1];
2098
2099 if (dev->enhanced_mode) {
2100 ep->cfg = &dev->epregs[ne[i]];
2101 /*
2102 * Set USB endpoint number, hardware allows same number
2103 * in both directions.
2104 */
2105 if (i > 0 && i < 5)
2106 writel(ne[i], &ep->cfg->ep_cfg);
2107 ep->regs = (struct net2280_ep_regs __iomem *)
2108 (((void __iomem *)&dev->epregs[ne[i]]) +
2109 ep_reg_addr[i]);
2110 } else {
2111 ep->cfg = &dev->epregs[i];
2112 ep->regs = &dev->epregs[i];
2113 }
2114
2115 ep->fifo_size = (i != 0) ? 2048 : 512;
2116
2117 ep_reset_338x(dev->regs, ep);
2118 }
2119 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2120
2121 dev->gadget.ep0 = &dev->ep[0].ep;
2122 dev->ep[0].stopped = 0;
2123
2124 /* Link layer set up */
2125 if (dev->bug7734_patched) {
2126 tmp = readl(&dev->usb_ext->usbctl2) &
2127 ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2128 writel(tmp, &dev->usb_ext->usbctl2);
2129 }
2130
2131 /* Hardware Defect and Workaround */
2132 val = readl(&dev->ll_lfps_regs->ll_lfps_5);
2133 val &= ~(0xf << TIMER_LFPS_6US);
2134 val |= 0x5 << TIMER_LFPS_6US;
2135 writel(val, &dev->ll_lfps_regs->ll_lfps_5);
2136
2137 val = readl(&dev->ll_lfps_regs->ll_lfps_6);
2138 val &= ~(0xffff << TIMER_LFPS_80US);
2139 val |= 0x0100 << TIMER_LFPS_80US;
2140 writel(val, &dev->ll_lfps_regs->ll_lfps_6);
2141
2142 /*
2143 * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2144 * Hot Reset Exit Handshake may Fail in Specific Case using
2145 * Default Register Settings. Workaround for Enumeration test.
2146 */
2147 val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
2148 val &= ~(0x1f << HOT_TX_NORESET_TS2);
2149 val |= 0x10 << HOT_TX_NORESET_TS2;
2150 writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
2151
2152 val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
2153 val &= ~(0x1f << HOT_RX_RESET_TS2);
2154 val |= 0x3 << HOT_RX_RESET_TS2;
2155 writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
2156
2157 /*
2158 * Set Recovery Idle to Recover bit:
2159 * - On SS connections, setting Recovery Idle to Recover Fmw improves
2160 * link robustness with various hosts and hubs.
2161 * - It is safe to set for all connection speeds; all chip revisions.
2162 * - R-M-W to leave other bits undisturbed.
2163 * - Reference PLX TT-7372
2164 */
2165 val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
2166 val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2167 writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
2168
2169 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2170
2171 /* disable dedicated endpoints */
2172 writel(0x0D, &dev->dep[0].dep_cfg);
2173 writel(0x0D, &dev->dep[1].dep_cfg);
2174 writel(0x0E, &dev->dep[2].dep_cfg);
2175 writel(0x0E, &dev->dep[3].dep_cfg);
2176 writel(0x0F, &dev->dep[4].dep_cfg);
2177 writel(0x0C, &dev->dep[5].dep_cfg);
2178 }
2179
2180 static void usb_reinit(struct net2280 *dev)
2181 {
2182 if (dev->quirks & PLX_LEGACY)
2183 return usb_reinit_228x(dev);
2184 return usb_reinit_338x(dev);
2185 }
2186
2187 static void ep0_start_228x(struct net2280 *dev)
2188 {
2189 writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2190 BIT(CLEAR_NAK_OUT_PACKETS) |
2191 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2192 &dev->epregs[0].ep_rsp);
2193
2194 /*
2195 * hardware optionally handles a bunch of standard requests
2196 * that the API hides from drivers anyway. have it do so.
2197 * endpoint status/features are handled in software, to
2198 * help pass tests for some dubious behavior.
2199 */
2200 writel(BIT(SET_TEST_MODE) |
2201 BIT(SET_ADDRESS) |
2202 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2203 BIT(GET_DEVICE_STATUS) |
2204 BIT(GET_INTERFACE_STATUS),
2205 &dev->usb->stdrsp);
2206 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2207 BIT(SELF_POWERED_USB_DEVICE) |
2208 BIT(REMOTE_WAKEUP_SUPPORT) |
2209 (dev->softconnect << USB_DETECT_ENABLE) |
2210 BIT(SELF_POWERED_STATUS),
2211 &dev->usb->usbctl);
2212
2213 /* enable irqs so we can see ep0 and general operation */
2214 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2215 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2216 &dev->regs->pciirqenb0);
2217 writel(BIT(PCI_INTERRUPT_ENABLE) |
2218 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2219 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2220 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2221 BIT(VBUS_INTERRUPT_ENABLE) |
2222 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2223 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2224 &dev->regs->pciirqenb1);
2225
2226 /* don't leave any writes posted */
2227 (void) readl(&dev->usb->usbctl);
2228 }
2229
2230 static void ep0_start_338x(struct net2280 *dev)
2231 {
2232
2233 if (dev->bug7734_patched)
2234 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2235 BIT(SET_EP_HIDE_STATUS_PHASE),
2236 &dev->epregs[0].ep_rsp);
2237
2238 /*
2239 * hardware optionally handles a bunch of standard requests
2240 * that the API hides from drivers anyway. have it do so.
2241 * endpoint status/features are handled in software, to
2242 * help pass tests for some dubious behavior.
2243 */
2244 writel(BIT(SET_ISOCHRONOUS_DELAY) |
2245 BIT(SET_SEL) |
2246 BIT(SET_TEST_MODE) |
2247 BIT(SET_ADDRESS) |
2248 BIT(GET_INTERFACE_STATUS) |
2249 BIT(GET_DEVICE_STATUS),
2250 &dev->usb->stdrsp);
2251 dev->wakeup_enable = 1;
2252 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2253 (dev->softconnect << USB_DETECT_ENABLE) |
2254 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2255 &dev->usb->usbctl);
2256
2257 /* enable irqs so we can see ep0 and general operation */
2258 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2259 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2260 &dev->regs->pciirqenb0);
2261 writel(BIT(PCI_INTERRUPT_ENABLE) |
2262 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2263 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2264 BIT(VBUS_INTERRUPT_ENABLE),
2265 &dev->regs->pciirqenb1);
2266
2267 /* don't leave any writes posted */
2268 (void)readl(&dev->usb->usbctl);
2269 }
2270
2271 static void ep0_start(struct net2280 *dev)
2272 {
2273 if (dev->quirks & PLX_LEGACY)
2274 return ep0_start_228x(dev);
2275 return ep0_start_338x(dev);
2276 }
2277
2278 /* when a driver is successfully registered, it will receive
2279 * control requests including set_configuration(), which enables
2280 * non-control requests. then usb traffic follows until a
2281 * disconnect is reported. then a host may connect again, or
2282 * the driver might get unbound.
2283 */
2284 static int net2280_start(struct usb_gadget *_gadget,
2285 struct usb_gadget_driver *driver)
2286 {
2287 struct net2280 *dev;
2288 int retval;
2289 unsigned i;
2290
2291 /* insist on high speed support from the driver, since
2292 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2293 * "must not be used in normal operation"
2294 */
2295 if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2296 !driver->setup)
2297 return -EINVAL;
2298
2299 dev = container_of(_gadget, struct net2280, gadget);
2300
2301 for (i = 0; i < dev->n_ep; i++)
2302 dev->ep[i].irqs = 0;
2303
2304 /* hook up the driver ... */
2305 driver->driver.bus = NULL;
2306 dev->driver = driver;
2307
2308 retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2309 if (retval)
2310 goto err_unbind;
2311 retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2312 if (retval)
2313 goto err_func;
2314
2315 /* enable host detection and ep0; and we're ready
2316 * for set_configuration as well as eventual disconnect.
2317 */
2318 net2280_led_active(dev, 1);
2319
2320 if ((dev->quirks & PLX_SUPERSPEED) && !dev->bug7734_patched)
2321 defect7374_enable_data_eps_zero(dev);
2322
2323 ep0_start(dev);
2324
2325 /* pci writes may still be posted */
2326 return 0;
2327
2328 err_func:
2329 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2330 err_unbind:
2331 dev->driver = NULL;
2332 return retval;
2333 }
2334
2335 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2336 {
2337 int i;
2338
2339 /* don't disconnect if it's not connected */
2340 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2341 driver = NULL;
2342
2343 /* stop hardware; prevent new request submissions;
2344 * and kill any outstanding requests.
2345 */
2346 usb_reset(dev);
2347 for (i = 0; i < dev->n_ep; i++)
2348 nuke(&dev->ep[i]);
2349
2350 /* report disconnect; the driver is already quiesced */
2351 if (driver) {
2352 spin_unlock(&dev->lock);
2353 driver->disconnect(&dev->gadget);
2354 spin_lock(&dev->lock);
2355 }
2356
2357 usb_reinit(dev);
2358 }
2359
2360 static int net2280_stop(struct usb_gadget *_gadget)
2361 {
2362 struct net2280 *dev;
2363 unsigned long flags;
2364
2365 dev = container_of(_gadget, struct net2280, gadget);
2366
2367 spin_lock_irqsave(&dev->lock, flags);
2368 stop_activity(dev, NULL);
2369 spin_unlock_irqrestore(&dev->lock, flags);
2370
2371 net2280_led_active(dev, 0);
2372
2373 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2374 device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2375
2376 dev->driver = NULL;
2377
2378 return 0;
2379 }
2380
2381 /*-------------------------------------------------------------------------*/
2382
2383 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2384 * also works for dma-capable endpoints, in pio mode or just
2385 * to manually advance the queue after short OUT transfers.
2386 */
2387 static void handle_ep_small(struct net2280_ep *ep)
2388 {
2389 struct net2280_request *req;
2390 u32 t;
2391 /* 0 error, 1 mid-data, 2 done */
2392 int mode = 1;
2393
2394 if (!list_empty(&ep->queue))
2395 req = list_entry(ep->queue.next,
2396 struct net2280_request, queue);
2397 else
2398 req = NULL;
2399
2400 /* ack all, and handle what we care about */
2401 t = readl(&ep->regs->ep_stat);
2402 ep->irqs++;
2403
2404 ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2405 ep->ep.name, t, req ? &req->req : NULL);
2406
2407 if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2408 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2409 else
2410 /* Added for 2282 */
2411 writel(t, &ep->regs->ep_stat);
2412
2413 /* for ep0, monitor token irqs to catch data stage length errors
2414 * and to synchronize on status.
2415 *
2416 * also, to defer reporting of protocol stalls ... here's where
2417 * data or status first appears, handling stalls here should never
2418 * cause trouble on the host side..
2419 *
2420 * control requests could be slightly faster without token synch for
2421 * status, but status can jam up that way.
2422 */
2423 if (unlikely(ep->num == 0)) {
2424 if (ep->is_in) {
2425 /* status; stop NAKing */
2426 if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2427 if (ep->dev->protocol_stall) {
2428 ep->stopped = 1;
2429 set_halt(ep);
2430 }
2431 if (!req)
2432 allow_status(ep);
2433 mode = 2;
2434 /* reply to extra IN data tokens with a zlp */
2435 } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2436 if (ep->dev->protocol_stall) {
2437 ep->stopped = 1;
2438 set_halt(ep);
2439 mode = 2;
2440 } else if (ep->responded &&
2441 !req && !ep->stopped)
2442 write_fifo(ep, NULL);
2443 }
2444 } else {
2445 /* status; stop NAKing */
2446 if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2447 if (ep->dev->protocol_stall) {
2448 ep->stopped = 1;
2449 set_halt(ep);
2450 }
2451 mode = 2;
2452 /* an extra OUT token is an error */
2453 } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2454 req &&
2455 req->req.actual == req->req.length) ||
2456 (ep->responded && !req)) {
2457 ep->dev->protocol_stall = 1;
2458 set_halt(ep);
2459 ep->stopped = 1;
2460 if (req)
2461 done(ep, req, -EOVERFLOW);
2462 req = NULL;
2463 }
2464 }
2465 }
2466
2467 if (unlikely(!req))
2468 return;
2469
2470 /* manual DMA queue advance after short OUT */
2471 if (likely(ep->dma)) {
2472 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2473 u32 count;
2474 int stopped = ep->stopped;
2475
2476 /* TRANSFERRED works around OUT_DONE erratum 0112.
2477 * we expect (N <= maxpacket) bytes; host wrote M.
2478 * iff (M < N) we won't ever see a DMA interrupt.
2479 */
2480 ep->stopped = 1;
2481 for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2482
2483 /* any preceding dma transfers must finish.
2484 * dma handles (M >= N), may empty the queue
2485 */
2486 scan_dma_completions(ep);
2487 if (unlikely(list_empty(&ep->queue) ||
2488 ep->out_overflow)) {
2489 req = NULL;
2490 break;
2491 }
2492 req = list_entry(ep->queue.next,
2493 struct net2280_request, queue);
2494
2495 /* here either (M < N), a "real" short rx;
2496 * or (M == N) and the queue didn't empty
2497 */
2498 if (likely(t & BIT(FIFO_EMPTY))) {
2499 count = readl(&ep->dma->dmacount);
2500 count &= DMA_BYTE_COUNT_MASK;
2501 if (readl(&ep->dma->dmadesc)
2502 != req->td_dma)
2503 req = NULL;
2504 break;
2505 }
2506 udelay(1);
2507 }
2508
2509 /* stop DMA, leave ep NAKing */
2510 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2511 spin_stop_dma(ep->dma);
2512
2513 if (likely(req)) {
2514 req->td->dmacount = 0;
2515 t = readl(&ep->regs->ep_avail);
2516 dma_done(ep, req, count,
2517 (ep->out_overflow || t)
2518 ? -EOVERFLOW : 0);
2519 }
2520
2521 /* also flush to prevent erratum 0106 trouble */
2522 if (unlikely(ep->out_overflow ||
2523 (ep->dev->chiprev == 0x0100 &&
2524 ep->dev->gadget.speed
2525 == USB_SPEED_FULL))) {
2526 out_flush(ep);
2527 ep->out_overflow = 0;
2528 }
2529
2530 /* (re)start dma if needed, stop NAKing */
2531 ep->stopped = stopped;
2532 if (!list_empty(&ep->queue))
2533 restart_dma(ep);
2534 } else
2535 ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2536 ep->ep.name, t);
2537 return;
2538
2539 /* data packet(s) received (in the fifo, OUT) */
2540 } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2541 if (read_fifo(ep, req) && ep->num != 0)
2542 mode = 2;
2543
2544 /* data packet(s) transmitted (IN) */
2545 } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2546 unsigned len;
2547
2548 len = req->req.length - req->req.actual;
2549 if (len > ep->ep.maxpacket)
2550 len = ep->ep.maxpacket;
2551 req->req.actual += len;
2552
2553 /* if we wrote it all, we're usually done */
2554 /* send zlps until the status stage */
2555 if ((req->req.actual == req->req.length) &&
2556 (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2557 mode = 2;
2558
2559 /* there was nothing to do ... */
2560 } else if (mode == 1)
2561 return;
2562
2563 /* done */
2564 if (mode == 2) {
2565 /* stream endpoints often resubmit/unlink in completion */
2566 done(ep, req, 0);
2567
2568 /* maybe advance queue to next request */
2569 if (ep->num == 0) {
2570 /* NOTE: net2280 could let gadget driver start the
2571 * status stage later. since not all controllers let
2572 * them control that, the api doesn't (yet) allow it.
2573 */
2574 if (!ep->stopped)
2575 allow_status(ep);
2576 req = NULL;
2577 } else {
2578 if (!list_empty(&ep->queue) && !ep->stopped)
2579 req = list_entry(ep->queue.next,
2580 struct net2280_request, queue);
2581 else
2582 req = NULL;
2583 if (req && !ep->is_in)
2584 stop_out_naking(ep);
2585 }
2586 }
2587
2588 /* is there a buffer for the next packet?
2589 * for best streaming performance, make sure there is one.
2590 */
2591 if (req && !ep->stopped) {
2592
2593 /* load IN fifo with next packet (may be zlp) */
2594 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2595 write_fifo(ep, &req->req);
2596 }
2597 }
2598
2599 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2600 {
2601 struct net2280_ep *ep;
2602
2603 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2604 return &dev->ep[0];
2605 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2606 u8 bEndpointAddress;
2607
2608 if (!ep->desc)
2609 continue;
2610 bEndpointAddress = ep->desc->bEndpointAddress;
2611 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2612 continue;
2613 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2614 return ep;
2615 }
2616 return NULL;
2617 }
2618
2619 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2620 {
2621 u32 scratch, fsmvalue;
2622 u32 ack_wait_timeout, state;
2623
2624 /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2625 scratch = get_idx_reg(dev->regs, SCRATCH);
2626 fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2627 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2628
2629 if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2630 (r.bRequestType & USB_DIR_IN)))
2631 return;
2632
2633 /* This is the first Control Read for this connection: */
2634 if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2635 /*
2636 * Connection is NOT SS:
2637 * - Connection must be FS or HS.
2638 * - This FSM state should allow workaround software to
2639 * run after the next USB connection.
2640 */
2641 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2642 dev->bug7734_patched = 1;
2643 goto restore_data_eps;
2644 }
2645
2646 /* Connection is SS: */
2647 for (ack_wait_timeout = 0;
2648 ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2649 ack_wait_timeout++) {
2650
2651 state = readl(&dev->plregs->pl_ep_status_1)
2652 & (0xff << STATE);
2653 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2654 (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2655 scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2656 dev->bug7734_patched = 1;
2657 break;
2658 }
2659
2660 /*
2661 * We have not yet received host's Data Phase ACK
2662 * - Wait and try again.
2663 */
2664 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2665
2666 continue;
2667 }
2668
2669
2670 if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2671 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2672 "to detect SS host's data phase ACK.");
2673 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2674 "got 0x%2.2x.\n", state >> STATE);
2675 } else {
2676 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2677 "%duSec for Control Read Data Phase ACK\n",
2678 DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2679 }
2680
2681 restore_data_eps:
2682 /*
2683 * Restore data EPs to their pre-workaround settings (disabled,
2684 * initialized, and other details).
2685 */
2686 defect7374_disable_data_eps(dev);
2687
2688 set_idx_reg(dev->regs, SCRATCH, scratch);
2689
2690 return;
2691 }
2692
2693 static void ep_clear_seqnum(struct net2280_ep *ep)
2694 {
2695 struct net2280 *dev = ep->dev;
2696 u32 val;
2697 static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2698
2699 val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2700 val |= ep_pl[ep->num];
2701 writel(val, &dev->plregs->pl_ep_ctrl);
2702 val |= BIT(SEQUENCE_NUMBER_RESET);
2703 writel(val, &dev->plregs->pl_ep_ctrl);
2704
2705 return;
2706 }
2707
2708 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2709 struct net2280_ep *ep, struct usb_ctrlrequest r)
2710 {
2711 int tmp = 0;
2712
2713 #define w_value le16_to_cpu(r.wValue)
2714 #define w_index le16_to_cpu(r.wIndex)
2715 #define w_length le16_to_cpu(r.wLength)
2716
2717 switch (r.bRequest) {
2718 struct net2280_ep *e;
2719 u16 status;
2720
2721 case USB_REQ_SET_CONFIGURATION:
2722 dev->addressed_state = !w_value;
2723 goto usb3_delegate;
2724
2725 case USB_REQ_GET_STATUS:
2726 switch (r.bRequestType) {
2727 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2728 status = dev->wakeup_enable ? 0x02 : 0x00;
2729 if (dev->gadget.is_selfpowered)
2730 status |= BIT(0);
2731 status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2732 dev->ltm_enable << 4);
2733 writel(0, &dev->epregs[0].ep_irqenb);
2734 set_fifo_bytecount(ep, sizeof(status));
2735 writel((__force u32) status, &dev->epregs[0].ep_data);
2736 allow_status_338x(ep);
2737 break;
2738
2739 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2740 e = get_ep_by_addr(dev, w_index);
2741 if (!e)
2742 goto do_stall3;
2743 status = readl(&e->regs->ep_rsp) &
2744 BIT(CLEAR_ENDPOINT_HALT);
2745 writel(0, &dev->epregs[0].ep_irqenb);
2746 set_fifo_bytecount(ep, sizeof(status));
2747 writel((__force u32) status, &dev->epregs[0].ep_data);
2748 allow_status_338x(ep);
2749 break;
2750
2751 default:
2752 goto usb3_delegate;
2753 }
2754 break;
2755
2756 case USB_REQ_CLEAR_FEATURE:
2757 switch (r.bRequestType) {
2758 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2759 if (!dev->addressed_state) {
2760 switch (w_value) {
2761 case USB_DEVICE_U1_ENABLE:
2762 dev->u1_enable = 0;
2763 writel(readl(&dev->usb_ext->usbctl2) &
2764 ~BIT(U1_ENABLE),
2765 &dev->usb_ext->usbctl2);
2766 allow_status_338x(ep);
2767 goto next_endpoints3;
2768
2769 case USB_DEVICE_U2_ENABLE:
2770 dev->u2_enable = 0;
2771 writel(readl(&dev->usb_ext->usbctl2) &
2772 ~BIT(U2_ENABLE),
2773 &dev->usb_ext->usbctl2);
2774 allow_status_338x(ep);
2775 goto next_endpoints3;
2776
2777 case USB_DEVICE_LTM_ENABLE:
2778 dev->ltm_enable = 0;
2779 writel(readl(&dev->usb_ext->usbctl2) &
2780 ~BIT(LTM_ENABLE),
2781 &dev->usb_ext->usbctl2);
2782 allow_status_338x(ep);
2783 goto next_endpoints3;
2784
2785 default:
2786 break;
2787 }
2788 }
2789 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2790 dev->wakeup_enable = 0;
2791 writel(readl(&dev->usb->usbctl) &
2792 ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2793 &dev->usb->usbctl);
2794 allow_status_338x(ep);
2795 break;
2796 }
2797 goto usb3_delegate;
2798
2799 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2800 e = get_ep_by_addr(dev, w_index);
2801 if (!e)
2802 goto do_stall3;
2803 if (w_value != USB_ENDPOINT_HALT)
2804 goto do_stall3;
2805 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2806 /*
2807 * Workaround for SS SeqNum not cleared via
2808 * Endpoint Halt (Clear) bit. select endpoint
2809 */
2810 ep_clear_seqnum(e);
2811 clear_halt(e);
2812 if (!list_empty(&e->queue) && e->td_dma)
2813 restart_dma(e);
2814 allow_status(ep);
2815 ep->stopped = 1;
2816 break;
2817
2818 default:
2819 goto usb3_delegate;
2820 }
2821 break;
2822 case USB_REQ_SET_FEATURE:
2823 switch (r.bRequestType) {
2824 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2825 if (!dev->addressed_state) {
2826 switch (w_value) {
2827 case USB_DEVICE_U1_ENABLE:
2828 dev->u1_enable = 1;
2829 writel(readl(&dev->usb_ext->usbctl2) |
2830 BIT(U1_ENABLE),
2831 &dev->usb_ext->usbctl2);
2832 allow_status_338x(ep);
2833 goto next_endpoints3;
2834
2835 case USB_DEVICE_U2_ENABLE:
2836 dev->u2_enable = 1;
2837 writel(readl(&dev->usb_ext->usbctl2) |
2838 BIT(U2_ENABLE),
2839 &dev->usb_ext->usbctl2);
2840 allow_status_338x(ep);
2841 goto next_endpoints3;
2842
2843 case USB_DEVICE_LTM_ENABLE:
2844 dev->ltm_enable = 1;
2845 writel(readl(&dev->usb_ext->usbctl2) |
2846 BIT(LTM_ENABLE),
2847 &dev->usb_ext->usbctl2);
2848 allow_status_338x(ep);
2849 goto next_endpoints3;
2850 default:
2851 break;
2852 }
2853 }
2854
2855 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2856 dev->wakeup_enable = 1;
2857 writel(readl(&dev->usb->usbctl) |
2858 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2859 &dev->usb->usbctl);
2860 allow_status_338x(ep);
2861 break;
2862 }
2863 goto usb3_delegate;
2864
2865 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2866 e = get_ep_by_addr(dev, w_index);
2867 if (!e || (w_value != USB_ENDPOINT_HALT))
2868 goto do_stall3;
2869 ep->stopped = 1;
2870 if (ep->num == 0)
2871 ep->dev->protocol_stall = 1;
2872 else {
2873 if (ep->dma)
2874 abort_dma(ep);
2875 set_halt(ep);
2876 }
2877 allow_status_338x(ep);
2878 break;
2879
2880 default:
2881 goto usb3_delegate;
2882 }
2883
2884 break;
2885 default:
2886
2887 usb3_delegate:
2888 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
2889 r.bRequestType, r.bRequest,
2890 w_value, w_index, w_length,
2891 readl(&ep->cfg->ep_cfg));
2892
2893 ep->responded = 0;
2894 spin_unlock(&dev->lock);
2895 tmp = dev->driver->setup(&dev->gadget, &r);
2896 spin_lock(&dev->lock);
2897 }
2898 do_stall3:
2899 if (tmp < 0) {
2900 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
2901 r.bRequestType, r.bRequest, tmp);
2902 dev->protocol_stall = 1;
2903 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
2904 set_halt(ep);
2905 }
2906
2907 next_endpoints3:
2908
2909 #undef w_value
2910 #undef w_index
2911 #undef w_length
2912
2913 return;
2914 }
2915
2916 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
2917 {
2918 u32 index;
2919 u32 bit;
2920
2921 for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
2922 bit = BIT(ep_bit[index]);
2923
2924 if (!stat0)
2925 break;
2926
2927 if (!(stat0 & bit))
2928 continue;
2929
2930 stat0 &= ~bit;
2931
2932 handle_ep_small(&dev->ep[index]);
2933 }
2934 }
2935
2936 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
2937 {
2938 struct net2280_ep *ep;
2939 u32 num, scratch;
2940
2941 /* most of these don't need individual acks */
2942 stat &= ~BIT(INTA_ASSERTED);
2943 if (!stat)
2944 return;
2945 /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
2946
2947 /* starting a control request? */
2948 if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
2949 union {
2950 u32 raw[2];
2951 struct usb_ctrlrequest r;
2952 } u;
2953 int tmp;
2954 struct net2280_request *req;
2955
2956 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
2957 u32 val = readl(&dev->usb->usbstat);
2958 if (val & BIT(SUPER_SPEED)) {
2959 dev->gadget.speed = USB_SPEED_SUPER;
2960 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
2961 EP0_SS_MAX_PACKET_SIZE);
2962 } else if (val & BIT(HIGH_SPEED)) {
2963 dev->gadget.speed = USB_SPEED_HIGH;
2964 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
2965 EP0_HS_MAX_PACKET_SIZE);
2966 } else {
2967 dev->gadget.speed = USB_SPEED_FULL;
2968 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
2969 EP0_HS_MAX_PACKET_SIZE);
2970 }
2971 net2280_led_speed(dev, dev->gadget.speed);
2972 ep_dbg(dev, "%s\n",
2973 usb_speed_string(dev->gadget.speed));
2974 }
2975
2976 ep = &dev->ep[0];
2977 ep->irqs++;
2978
2979 /* make sure any leftover request state is cleared */
2980 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
2981 while (!list_empty(&ep->queue)) {
2982 req = list_entry(ep->queue.next,
2983 struct net2280_request, queue);
2984 done(ep, req, (req->req.actual == req->req.length)
2985 ? 0 : -EPROTO);
2986 }
2987 ep->stopped = 0;
2988 dev->protocol_stall = 0;
2989 if (!(dev->quirks & PLX_SUPERSPEED)) {
2990 if (ep->dev->quirks & PLX_2280)
2991 tmp = BIT(FIFO_OVERFLOW) |
2992 BIT(FIFO_UNDERFLOW);
2993 else
2994 tmp = 0;
2995
2996 writel(tmp | BIT(TIMEOUT) |
2997 BIT(USB_STALL_SENT) |
2998 BIT(USB_IN_NAK_SENT) |
2999 BIT(USB_IN_ACK_RCVD) |
3000 BIT(USB_OUT_PING_NAK_SENT) |
3001 BIT(USB_OUT_ACK_SENT) |
3002 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3003 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3004 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3005 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3006 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3007 BIT(DATA_IN_TOKEN_INTERRUPT),
3008 &ep->regs->ep_stat);
3009 }
3010 u.raw[0] = readl(&dev->usb->setup0123);
3011 u.raw[1] = readl(&dev->usb->setup4567);
3012
3013 cpu_to_le32s(&u.raw[0]);
3014 cpu_to_le32s(&u.raw[1]);
3015
3016 if ((dev->quirks & PLX_SUPERSPEED) && !dev->bug7734_patched)
3017 defect7374_workaround(dev, u.r);
3018
3019 tmp = 0;
3020
3021 #define w_value le16_to_cpu(u.r.wValue)
3022 #define w_index le16_to_cpu(u.r.wIndex)
3023 #define w_length le16_to_cpu(u.r.wLength)
3024
3025 /* ack the irq */
3026 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3027 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3028
3029 /* watch control traffic at the token level, and force
3030 * synchronization before letting the status stage happen.
3031 * FIXME ignore tokens we'll NAK, until driver responds.
3032 * that'll mean a lot less irqs for some drivers.
3033 */
3034 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3035 if (ep->is_in) {
3036 scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3037 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3038 BIT(DATA_IN_TOKEN_INTERRUPT);
3039 stop_out_naking(ep);
3040 } else
3041 scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3042 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3043 BIT(DATA_IN_TOKEN_INTERRUPT);
3044 writel(scratch, &dev->epregs[0].ep_irqenb);
3045
3046 /* we made the hardware handle most lowlevel requests;
3047 * everything else goes uplevel to the gadget code.
3048 */
3049 ep->responded = 1;
3050
3051 if (dev->gadget.speed == USB_SPEED_SUPER) {
3052 handle_stat0_irqs_superspeed(dev, ep, u.r);
3053 goto next_endpoints;
3054 }
3055
3056 switch (u.r.bRequest) {
3057 case USB_REQ_GET_STATUS: {
3058 struct net2280_ep *e;
3059 __le32 status;
3060
3061 /* hw handles device and interface status */
3062 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3063 goto delegate;
3064 e = get_ep_by_addr(dev, w_index);
3065 if (!e || w_length > 2)
3066 goto do_stall;
3067
3068 if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3069 status = cpu_to_le32(1);
3070 else
3071 status = cpu_to_le32(0);
3072
3073 /* don't bother with a request object! */
3074 writel(0, &dev->epregs[0].ep_irqenb);
3075 set_fifo_bytecount(ep, w_length);
3076 writel((__force u32)status, &dev->epregs[0].ep_data);
3077 allow_status(ep);
3078 ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3079 goto next_endpoints;
3080 }
3081 break;
3082 case USB_REQ_CLEAR_FEATURE: {
3083 struct net2280_ep *e;
3084
3085 /* hw handles device features */
3086 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3087 goto delegate;
3088 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3089 goto do_stall;
3090 e = get_ep_by_addr(dev, w_index);
3091 if (!e)
3092 goto do_stall;
3093 if (e->wedged) {
3094 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3095 ep->ep.name);
3096 } else {
3097 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3098 clear_halt(e);
3099 if ((ep->dev->quirks & PLX_SUPERSPEED) &&
3100 !list_empty(&e->queue) && e->td_dma)
3101 restart_dma(e);
3102 }
3103 allow_status(ep);
3104 goto next_endpoints;
3105 }
3106 break;
3107 case USB_REQ_SET_FEATURE: {
3108 struct net2280_ep *e;
3109
3110 /* hw handles device features */
3111 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3112 goto delegate;
3113 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3114 goto do_stall;
3115 e = get_ep_by_addr(dev, w_index);
3116 if (!e)
3117 goto do_stall;
3118 if (e->ep.name == ep0name)
3119 goto do_stall;
3120 set_halt(e);
3121 if ((dev->quirks & PLX_SUPERSPEED) && e->dma)
3122 abort_dma(e);
3123 allow_status(ep);
3124 ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3125 goto next_endpoints;
3126 }
3127 break;
3128 default:
3129 delegate:
3130 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3131 "ep_cfg %08x\n",
3132 u.r.bRequestType, u.r.bRequest,
3133 w_value, w_index, w_length,
3134 readl(&ep->cfg->ep_cfg));
3135 ep->responded = 0;
3136 spin_unlock(&dev->lock);
3137 tmp = dev->driver->setup(&dev->gadget, &u.r);
3138 spin_lock(&dev->lock);
3139 }
3140
3141 /* stall ep0 on error */
3142 if (tmp < 0) {
3143 do_stall:
3144 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3145 u.r.bRequestType, u.r.bRequest, tmp);
3146 dev->protocol_stall = 1;
3147 }
3148
3149 /* some in/out token irq should follow; maybe stall then.
3150 * driver must queue a request (even zlp) or halt ep0
3151 * before the host times out.
3152 */
3153 }
3154
3155 #undef w_value
3156 #undef w_index
3157 #undef w_length
3158
3159 next_endpoints:
3160 if ((dev->quirks & PLX_SUPERSPEED) && dev->enhanced_mode) {
3161 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3162 USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3163 USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3164
3165 if (stat & mask) {
3166 usb338x_handle_ep_intr(dev, stat & mask);
3167 stat &= ~mask;
3168 }
3169 } else {
3170 /* endpoint data irq ? */
3171 scratch = stat & 0x7f;
3172 stat &= ~0x7f;
3173 for (num = 0; scratch; num++) {
3174 u32 t;
3175
3176 /* do this endpoint's FIFO and queue need tending? */
3177 t = BIT(num);
3178 if ((scratch & t) == 0)
3179 continue;
3180 scratch ^= t;
3181
3182 ep = &dev->ep[num];
3183 handle_ep_small(ep);
3184 }
3185 }
3186
3187 if (stat)
3188 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3189 }
3190
3191 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3192 BIT(DMA_C_INTERRUPT) | \
3193 BIT(DMA_B_INTERRUPT) | \
3194 BIT(DMA_A_INTERRUPT))
3195 #define PCI_ERROR_INTERRUPTS ( \
3196 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3197 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3198 BIT(PCI_RETRY_ABORT_INTERRUPT))
3199
3200 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3201 __releases(dev->lock)
3202 __acquires(dev->lock)
3203 {
3204 struct net2280_ep *ep;
3205 u32 tmp, num, mask, scratch;
3206
3207 /* after disconnect there's nothing else to do! */
3208 tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3209 mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3210
3211 /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3212 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3213 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3214 * only indicates a change in the reset state).
3215 */
3216 if (stat & tmp) {
3217 bool reset = false;
3218 bool disconnect = false;
3219
3220 /*
3221 * Ignore disconnects and resets if the speed hasn't been set.
3222 * VBUS can bounce and there's always an initial reset.
3223 */
3224 writel(tmp, &dev->regs->irqstat1);
3225 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3226 if ((stat & BIT(VBUS_INTERRUPT)) &&
3227 (readl(&dev->usb->usbctl) &
3228 BIT(VBUS_PIN)) == 0) {
3229 disconnect = true;
3230 ep_dbg(dev, "disconnect %s\n",
3231 dev->driver->driver.name);
3232 } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3233 (readl(&dev->usb->usbstat) & mask)
3234 == 0) {
3235 reset = true;
3236 ep_dbg(dev, "reset %s\n",
3237 dev->driver->driver.name);
3238 }
3239
3240 if (disconnect || reset) {
3241 stop_activity(dev, dev->driver);
3242 ep0_start(dev);
3243 spin_unlock(&dev->lock);
3244 if (reset)
3245 usb_gadget_udc_reset
3246 (&dev->gadget, dev->driver);
3247 else
3248 (dev->driver->disconnect)
3249 (&dev->gadget);
3250 spin_lock(&dev->lock);
3251 return;
3252 }
3253 }
3254 stat &= ~tmp;
3255
3256 /* vBUS can bounce ... one of many reasons to ignore the
3257 * notion of hotplug events on bus connect/disconnect!
3258 */
3259 if (!stat)
3260 return;
3261 }
3262
3263 /* NOTE: chip stays in PCI D0 state for now, but it could
3264 * enter D1 to save more power
3265 */
3266 tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3267 if (stat & tmp) {
3268 writel(tmp, &dev->regs->irqstat1);
3269 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3270 if (dev->driver->suspend)
3271 dev->driver->suspend(&dev->gadget);
3272 if (!enable_suspend)
3273 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3274 } else {
3275 if (dev->driver->resume)
3276 dev->driver->resume(&dev->gadget);
3277 /* at high speed, note erratum 0133 */
3278 }
3279 stat &= ~tmp;
3280 }
3281
3282 /* clear any other status/irqs */
3283 if (stat)
3284 writel(stat, &dev->regs->irqstat1);
3285
3286 /* some status we can just ignore */
3287 if (dev->quirks & PLX_2280)
3288 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3289 BIT(SUSPEND_REQUEST_INTERRUPT) |
3290 BIT(RESUME_INTERRUPT) |
3291 BIT(SOF_INTERRUPT));
3292 else
3293 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3294 BIT(RESUME_INTERRUPT) |
3295 BIT(SOF_DOWN_INTERRUPT) |
3296 BIT(SOF_INTERRUPT));
3297
3298 if (!stat)
3299 return;
3300 /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3301
3302 /* DMA status, for ep-{a,b,c,d} */
3303 scratch = stat & DMA_INTERRUPTS;
3304 stat &= ~DMA_INTERRUPTS;
3305 scratch >>= 9;
3306 for (num = 0; scratch; num++) {
3307 struct net2280_dma_regs __iomem *dma;
3308
3309 tmp = BIT(num);
3310 if ((tmp & scratch) == 0)
3311 continue;
3312 scratch ^= tmp;
3313
3314 ep = &dev->ep[num + 1];
3315 dma = ep->dma;
3316
3317 if (!dma)
3318 continue;
3319
3320 /* clear ep's dma status */
3321 tmp = readl(&dma->dmastat);
3322 writel(tmp, &dma->dmastat);
3323
3324 /* dma sync*/
3325 if (dev->quirks & PLX_SUPERSPEED) {
3326 u32 r_dmacount = readl(&dma->dmacount);
3327 if (!ep->is_in && (r_dmacount & 0x00FFFFFF) &&
3328 (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3329 continue;
3330 }
3331
3332 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3333 ep_dbg(ep->dev, "%s no xact done? %08x\n",
3334 ep->ep.name, tmp);
3335 continue;
3336 }
3337 stop_dma(ep->dma);
3338
3339 /* OUT transfers terminate when the data from the
3340 * host is in our memory. Process whatever's done.
3341 * On this path, we know transfer's last packet wasn't
3342 * less than req->length. NAK_OUT_PACKETS may be set,
3343 * or the FIFO may already be holding new packets.
3344 *
3345 * IN transfers can linger in the FIFO for a very
3346 * long time ... we ignore that for now, accounting
3347 * precisely (like PIO does) needs per-packet irqs
3348 */
3349 scan_dma_completions(ep);
3350
3351 /* disable dma on inactive queues; else maybe restart */
3352 if (!list_empty(&ep->queue)) {
3353 tmp = readl(&dma->dmactl);
3354 restart_dma(ep);
3355 }
3356 ep->irqs++;
3357 }
3358
3359 /* NOTE: there are other PCI errors we might usefully notice.
3360 * if they appear very often, here's where to try recovering.
3361 */
3362 if (stat & PCI_ERROR_INTERRUPTS) {
3363 ep_err(dev, "pci dma error; stat %08x\n", stat);
3364 stat &= ~PCI_ERROR_INTERRUPTS;
3365 /* these are fatal errors, but "maybe" they won't
3366 * happen again ...
3367 */
3368 stop_activity(dev, dev->driver);
3369 ep0_start(dev);
3370 stat = 0;
3371 }
3372
3373 if (stat)
3374 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3375 }
3376
3377 static irqreturn_t net2280_irq(int irq, void *_dev)
3378 {
3379 struct net2280 *dev = _dev;
3380
3381 /* shared interrupt, not ours */
3382 if ((dev->quirks & PLX_LEGACY) &&
3383 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3384 return IRQ_NONE;
3385
3386 spin_lock(&dev->lock);
3387
3388 /* handle disconnect, dma, and more */
3389 handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3390
3391 /* control requests and PIO */
3392 handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3393
3394 if (dev->quirks & PLX_SUPERSPEED) {
3395 /* re-enable interrupt to trigger any possible new interrupt */
3396 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3397 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3398 writel(pciirqenb1, &dev->regs->pciirqenb1);
3399 }
3400
3401 spin_unlock(&dev->lock);
3402
3403 return IRQ_HANDLED;
3404 }
3405
3406 /*-------------------------------------------------------------------------*/
3407
3408 static void gadget_release(struct device *_dev)
3409 {
3410 struct net2280 *dev = dev_get_drvdata(_dev);
3411
3412 kfree(dev);
3413 }
3414
3415 /* tear down the binding between this driver and the pci device */
3416
3417 static void net2280_remove(struct pci_dev *pdev)
3418 {
3419 struct net2280 *dev = pci_get_drvdata(pdev);
3420
3421 usb_del_gadget_udc(&dev->gadget);
3422
3423 BUG_ON(dev->driver);
3424
3425 /* then clean up the resources we allocated during probe() */
3426 net2280_led_shutdown(dev);
3427 if (dev->requests) {
3428 int i;
3429 for (i = 1; i < 5; i++) {
3430 if (!dev->ep[i].dummy)
3431 continue;
3432 pci_pool_free(dev->requests, dev->ep[i].dummy,
3433 dev->ep[i].td_dma);
3434 }
3435 pci_pool_destroy(dev->requests);
3436 }
3437 if (dev->got_irq)
3438 free_irq(pdev->irq, dev);
3439 if (dev->quirks & PLX_SUPERSPEED)
3440 pci_disable_msi(pdev);
3441 if (dev->regs)
3442 iounmap(dev->regs);
3443 if (dev->region)
3444 release_mem_region(pci_resource_start(pdev, 0),
3445 pci_resource_len(pdev, 0));
3446 if (dev->enabled)
3447 pci_disable_device(pdev);
3448 device_remove_file(&pdev->dev, &dev_attr_registers);
3449
3450 ep_info(dev, "unbind\n");
3451 }
3452
3453 /* wrap this driver around the specified device, but
3454 * don't respond over USB until a gadget driver binds to us.
3455 */
3456
3457 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3458 {
3459 struct net2280 *dev;
3460 unsigned long resource, len;
3461 void __iomem *base = NULL;
3462 int retval, i;
3463
3464 /* alloc, and start init */
3465 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3466 if (dev == NULL) {
3467 retval = -ENOMEM;
3468 goto done;
3469 }
3470
3471 pci_set_drvdata(pdev, dev);
3472 spin_lock_init(&dev->lock);
3473 dev->quirks = id->driver_data;
3474 dev->pdev = pdev;
3475 dev->gadget.ops = &net2280_ops;
3476 dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3477 USB_SPEED_SUPER : USB_SPEED_HIGH;
3478
3479 /* the "gadget" abstracts/virtualizes the controller */
3480 dev->gadget.name = driver_name;
3481
3482 /* now all the pci goodies ... */
3483 if (pci_enable_device(pdev) < 0) {
3484 retval = -ENODEV;
3485 goto done;
3486 }
3487 dev->enabled = 1;
3488
3489 /* BAR 0 holds all the registers
3490 * BAR 1 is 8051 memory; unused here (note erratum 0103)
3491 * BAR 2 is fifo memory; unused here
3492 */
3493 resource = pci_resource_start(pdev, 0);
3494 len = pci_resource_len(pdev, 0);
3495 if (!request_mem_region(resource, len, driver_name)) {
3496 ep_dbg(dev, "controller already in use\n");
3497 retval = -EBUSY;
3498 goto done;
3499 }
3500 dev->region = 1;
3501
3502 /* FIXME provide firmware download interface to put
3503 * 8051 code into the chip, e.g. to turn on PCI PM.
3504 */
3505
3506 base = ioremap_nocache(resource, len);
3507 if (base == NULL) {
3508 ep_dbg(dev, "can't map memory\n");
3509 retval = -EFAULT;
3510 goto done;
3511 }
3512 dev->regs = (struct net2280_regs __iomem *) base;
3513 dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3514 dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3515 dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3516 dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3517 dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3518
3519 if (dev->quirks & PLX_SUPERSPEED) {
3520 u32 fsmvalue;
3521 u32 usbstat;
3522 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3523 (base + 0x00b4);
3524 dev->llregs = (struct usb338x_ll_regs __iomem *)
3525 (base + 0x0700);
3526 dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
3527 (base + 0x0748);
3528 dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
3529 (base + 0x077c);
3530 dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
3531 (base + 0x079c);
3532 dev->plregs = (struct usb338x_pl_regs __iomem *)
3533 (base + 0x0800);
3534 usbstat = readl(&dev->usb->usbstat);
3535 dev->enhanced_mode = !!(usbstat & BIT(11));
3536 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3537 /* put into initial config, link up all endpoints */
3538 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3539 (0xf << DEFECT7374_FSM_FIELD);
3540 /* See if firmware needs to set up for workaround: */
3541 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3542 dev->bug7734_patched = 1;
3543 writel(0, &dev->usb->usbctl);
3544 } else
3545 dev->bug7734_patched = 0;
3546 } else {
3547 dev->enhanced_mode = 0;
3548 dev->n_ep = 7;
3549 /* put into initial config, link up all endpoints */
3550 writel(0, &dev->usb->usbctl);
3551 }
3552
3553 usb_reset(dev);
3554 usb_reinit(dev);
3555
3556 /* irq setup after old hardware is cleaned up */
3557 if (!pdev->irq) {
3558 ep_err(dev, "No IRQ. Check PCI setup!\n");
3559 retval = -ENODEV;
3560 goto done;
3561 }
3562
3563 if (dev->quirks & PLX_SUPERSPEED)
3564 if (pci_enable_msi(pdev))
3565 ep_err(dev, "Failed to enable MSI mode\n");
3566
3567 if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3568 driver_name, dev)) {
3569 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3570 retval = -EBUSY;
3571 goto done;
3572 }
3573 dev->got_irq = 1;
3574
3575 /* DMA setup */
3576 /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */
3577 dev->requests = pci_pool_create("requests", pdev,
3578 sizeof(struct net2280_dma),
3579 0 /* no alignment requirements */,
3580 0 /* or page-crossing issues */);
3581 if (!dev->requests) {
3582 ep_dbg(dev, "can't get request pool\n");
3583 retval = -ENOMEM;
3584 goto done;
3585 }
3586 for (i = 1; i < 5; i++) {
3587 struct net2280_dma *td;
3588
3589 td = pci_pool_alloc(dev->requests, GFP_KERNEL,
3590 &dev->ep[i].td_dma);
3591 if (!td) {
3592 ep_dbg(dev, "can't get dummy %d\n", i);
3593 retval = -ENOMEM;
3594 goto done;
3595 }
3596 td->dmacount = 0; /* not VALID */
3597 td->dmadesc = td->dmaaddr;
3598 dev->ep[i].dummy = td;
3599 }
3600
3601 /* enable lower-overhead pci memory bursts during DMA */
3602 if (dev->quirks & PLX_LEGACY)
3603 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3604 /*
3605 * 256 write retries may not be enough...
3606 BIT(PCI_RETRY_ABORT_ENABLE) |
3607 */
3608 BIT(DMA_READ_MULTIPLE_ENABLE) |
3609 BIT(DMA_READ_LINE_ENABLE),
3610 &dev->pci->pcimstctl);
3611 /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3612 pci_set_master(pdev);
3613 pci_try_set_mwi(pdev);
3614
3615 /* ... also flushes any posted pci writes */
3616 dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3617
3618 /* done */
3619 ep_info(dev, "%s\n", driver_desc);
3620 ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3621 pdev->irq, base, dev->chiprev);
3622 ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3623 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3624 retval = device_create_file(&pdev->dev, &dev_attr_registers);
3625 if (retval)
3626 goto done;
3627
3628 retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
3629 gadget_release);
3630 if (retval)
3631 goto done;
3632 return 0;
3633
3634 done:
3635 if (dev)
3636 net2280_remove(pdev);
3637 return retval;
3638 }
3639
3640 /* make sure the board is quiescent; otherwise it will continue
3641 * generating IRQs across the upcoming reboot.
3642 */
3643
3644 static void net2280_shutdown(struct pci_dev *pdev)
3645 {
3646 struct net2280 *dev = pci_get_drvdata(pdev);
3647
3648 /* disable IRQs */
3649 writel(0, &dev->regs->pciirqenb0);
3650 writel(0, &dev->regs->pciirqenb1);
3651
3652 /* disable the pullup so the host will think we're gone */
3653 writel(0, &dev->usb->usbctl);
3654
3655 }
3656
3657
3658 /*-------------------------------------------------------------------------*/
3659
3660 static const struct pci_device_id pci_ids[] = { {
3661 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3662 .class_mask = ~0,
3663 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3664 .device = 0x2280,
3665 .subvendor = PCI_ANY_ID,
3666 .subdevice = PCI_ANY_ID,
3667 .driver_data = PLX_LEGACY | PLX_2280,
3668 }, {
3669 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3670 .class_mask = ~0,
3671 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3672 .device = 0x2282,
3673 .subvendor = PCI_ANY_ID,
3674 .subdevice = PCI_ANY_ID,
3675 .driver_data = PLX_LEGACY,
3676 },
3677 {
3678 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3679 .class_mask = ~0,
3680 .vendor = PCI_VENDOR_ID_PLX,
3681 .device = 0x3380,
3682 .subvendor = PCI_ANY_ID,
3683 .subdevice = PCI_ANY_ID,
3684 .driver_data = PLX_SUPERSPEED,
3685 },
3686 {
3687 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3688 .class_mask = ~0,
3689 .vendor = PCI_VENDOR_ID_PLX,
3690 .device = 0x3382,
3691 .subvendor = PCI_ANY_ID,
3692 .subdevice = PCI_ANY_ID,
3693 .driver_data = PLX_SUPERSPEED,
3694 },
3695 { /* end: all zeroes */ }
3696 };
3697 MODULE_DEVICE_TABLE(pci, pci_ids);
3698
3699 /* pci driver glue; this is a "new style" PCI driver module */
3700 static struct pci_driver net2280_pci_driver = {
3701 .name = (char *) driver_name,
3702 .id_table = pci_ids,
3703
3704 .probe = net2280_probe,
3705 .remove = net2280_remove,
3706 .shutdown = net2280_shutdown,
3707
3708 /* FIXME add power management support */
3709 };
3710
3711 module_pci_driver(net2280_pci_driver);
3712
3713 MODULE_DESCRIPTION(DRIVER_DESC);
3714 MODULE_AUTHOR("David Brownell");
3715 MODULE_LICENSE("GPL");
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