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Merge tag 'iio-for-4.13b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[mirror_ubuntu-artful-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
78 #define EP_INFO(_name, _caps) \
79 { \
80 .name = _name, \
81 .caps = _caps, \
82 }
83
84 static const struct {
85 const char *name;
86 const struct usb_ep_caps caps;
87 } ep_info_dft[] = { /* Default endpoint configuration */
88 EP_INFO(ep0name,
89 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
90 EP_INFO("ep-a",
91 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
92 EP_INFO("ep-b",
93 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
94 EP_INFO("ep-c",
95 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
96 EP_INFO("ep-d",
97 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
98 EP_INFO("ep-e",
99 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
100 EP_INFO("ep-f",
101 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
102 EP_INFO("ep-g",
103 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
104 EP_INFO("ep-h",
105 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
106 }, ep_info_adv[] = { /* Endpoints for usb3380 advance mode */
107 EP_INFO(ep0name,
108 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
109 EP_INFO("ep1in",
110 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
111 EP_INFO("ep2out",
112 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
113 EP_INFO("ep3in",
114 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
115 EP_INFO("ep4out",
116 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
117 EP_INFO("ep1out",
118 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
119 EP_INFO("ep2in",
120 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
121 EP_INFO("ep3out",
122 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
123 EP_INFO("ep4in",
124 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
125 };
126
127 #undef EP_INFO
128
129 /* mode 0 == ep-{a,b,c,d} 1K fifo each
130 * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
131 * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
132 */
133 static ushort fifo_mode;
134
135 /* "modprobe net2280 fifo_mode=1" etc */
136 module_param(fifo_mode, ushort, 0644);
137
138 /* enable_suspend -- When enabled, the driver will respond to
139 * USB suspend requests by powering down the NET2280. Otherwise,
140 * USB suspend requests will be ignored. This is acceptable for
141 * self-powered devices
142 */
143 static bool enable_suspend;
144
145 /* "modprobe net2280 enable_suspend=1" etc */
146 module_param(enable_suspend, bool, 0444);
147
148 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
149
150 static char *type_string(u8 bmAttributes)
151 {
152 switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
153 case USB_ENDPOINT_XFER_BULK: return "bulk";
154 case USB_ENDPOINT_XFER_ISOC: return "iso";
155 case USB_ENDPOINT_XFER_INT: return "intr";
156 }
157 return "control";
158 }
159
160 #include "net2280.h"
161
162 #define valid_bit cpu_to_le32(BIT(VALID_BIT))
163 #define dma_done_ie cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
164
165 static void ep_clear_seqnum(struct net2280_ep *ep);
166 static void stop_activity(struct net2280 *dev,
167 struct usb_gadget_driver *driver);
168 static void ep0_start(struct net2280 *dev);
169
170 /*-------------------------------------------------------------------------*/
171 static inline void enable_pciirqenb(struct net2280_ep *ep)
172 {
173 u32 tmp = readl(&ep->dev->regs->pciirqenb0);
174
175 if (ep->dev->quirks & PLX_LEGACY)
176 tmp |= BIT(ep->num);
177 else
178 tmp |= BIT(ep_bit[ep->num]);
179 writel(tmp, &ep->dev->regs->pciirqenb0);
180
181 return;
182 }
183
184 static int
185 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
186 {
187 struct net2280 *dev;
188 struct net2280_ep *ep;
189 u32 max;
190 u32 tmp = 0;
191 u32 type;
192 unsigned long flags;
193 static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
194 int ret = 0;
195
196 ep = container_of(_ep, struct net2280_ep, ep);
197 if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
198 desc->bDescriptorType != USB_DT_ENDPOINT) {
199 pr_err("%s: failed at line=%d\n", __func__, __LINE__);
200 return -EINVAL;
201 }
202 dev = ep->dev;
203 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
204 ret = -ESHUTDOWN;
205 goto print_err;
206 }
207
208 /* erratum 0119 workaround ties up an endpoint number */
209 if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
210 ret = -EDOM;
211 goto print_err;
212 }
213
214 if (dev->quirks & PLX_PCIE) {
215 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
216 ret = -EDOM;
217 goto print_err;
218 }
219 ep->is_in = !!usb_endpoint_dir_in(desc);
220 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
221 ret = -EINVAL;
222 goto print_err;
223 }
224 }
225
226 /* sanity check ep-e/ep-f since their fifos are small */
227 max = usb_endpoint_maxp(desc);
228 if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
229 ret = -ERANGE;
230 goto print_err;
231 }
232
233 spin_lock_irqsave(&dev->lock, flags);
234 _ep->maxpacket = max;
235 ep->desc = desc;
236
237 /* ep_reset() has already been called */
238 ep->stopped = 0;
239 ep->wedged = 0;
240 ep->out_overflow = 0;
241
242 /* set speed-dependent max packet; may kick in high bandwidth */
243 set_max_speed(ep, max);
244
245 /* set type, direction, address; reset fifo counters */
246 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
247
248 if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
249 tmp = readl(&ep->cfg->ep_cfg);
250 /* If USB ep number doesn't match hardware ep number */
251 if ((tmp & 0xf) != usb_endpoint_num(desc)) {
252 ret = -EINVAL;
253 spin_unlock_irqrestore(&dev->lock, flags);
254 goto print_err;
255 }
256 if (ep->is_in)
257 tmp &= ~USB3380_EP_CFG_MASK_IN;
258 else
259 tmp &= ~USB3380_EP_CFG_MASK_OUT;
260 }
261 type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
262 if (type == USB_ENDPOINT_XFER_INT) {
263 /* erratum 0105 workaround prevents hs NYET */
264 if (dev->chiprev == 0100 &&
265 dev->gadget.speed == USB_SPEED_HIGH &&
266 !(desc->bEndpointAddress & USB_DIR_IN))
267 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
268 &ep->regs->ep_rsp);
269 } else if (type == USB_ENDPOINT_XFER_BULK) {
270 /* catch some particularly blatant driver bugs */
271 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
272 (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
273 (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
274 spin_unlock_irqrestore(&dev->lock, flags);
275 ret = -ERANGE;
276 goto print_err;
277 }
278 }
279 ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
280 /* Enable this endpoint */
281 if (dev->quirks & PLX_LEGACY) {
282 tmp |= type << ENDPOINT_TYPE;
283 tmp |= desc->bEndpointAddress;
284 /* default full fifo lines */
285 tmp |= (4 << ENDPOINT_BYTE_COUNT);
286 tmp |= BIT(ENDPOINT_ENABLE);
287 ep->is_in = (tmp & USB_DIR_IN) != 0;
288 } else {
289 /* In Legacy mode, only OUT endpoints are used */
290 if (dev->enhanced_mode && ep->is_in) {
291 tmp |= type << IN_ENDPOINT_TYPE;
292 tmp |= BIT(IN_ENDPOINT_ENABLE);
293 } else {
294 tmp |= type << OUT_ENDPOINT_TYPE;
295 tmp |= BIT(OUT_ENDPOINT_ENABLE);
296 tmp |= (ep->is_in << ENDPOINT_DIRECTION);
297 }
298
299 tmp |= (4 << ENDPOINT_BYTE_COUNT);
300 if (!dev->enhanced_mode)
301 tmp |= usb_endpoint_num(desc);
302 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
303 }
304
305 /* Make sure all the registers are written before ep_rsp*/
306 wmb();
307
308 /* for OUT transfers, block the rx fifo until a read is posted */
309 if (!ep->is_in)
310 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
311 else if (!(dev->quirks & PLX_2280)) {
312 /* Added for 2282, Don't use nak packets on an in endpoint,
313 * this was ignored on 2280
314 */
315 writel(BIT(CLEAR_NAK_OUT_PACKETS) |
316 BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
317 }
318
319 if (dev->quirks & PLX_PCIE)
320 ep_clear_seqnum(ep);
321 writel(tmp, &ep->cfg->ep_cfg);
322
323 /* enable irqs */
324 if (!ep->dma) { /* pio, per-packet */
325 enable_pciirqenb(ep);
326
327 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
328 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
329 if (dev->quirks & PLX_2280)
330 tmp |= readl(&ep->regs->ep_irqenb);
331 writel(tmp, &ep->regs->ep_irqenb);
332 } else { /* dma, per-request */
333 tmp = BIT((8 + ep->num)); /* completion */
334 tmp |= readl(&dev->regs->pciirqenb1);
335 writel(tmp, &dev->regs->pciirqenb1);
336
337 /* for short OUT transfers, dma completions can't
338 * advance the queue; do it pio-style, by hand.
339 * NOTE erratum 0112 workaround #2
340 */
341 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
342 tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
343 writel(tmp, &ep->regs->ep_irqenb);
344
345 enable_pciirqenb(ep);
346 }
347 }
348
349 tmp = desc->bEndpointAddress;
350 ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
351 _ep->name, tmp & 0x0f, DIR_STRING(tmp),
352 type_string(desc->bmAttributes),
353 ep->dma ? "dma" : "pio", max);
354
355 /* pci writes may still be posted */
356 spin_unlock_irqrestore(&dev->lock, flags);
357 return ret;
358
359 print_err:
360 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
361 return ret;
362 }
363
364 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
365 {
366 u32 result;
367
368 do {
369 result = readl(ptr);
370 if (result == ~(u32)0) /* "device unplugged" */
371 return -ENODEV;
372 result &= mask;
373 if (result == done)
374 return 0;
375 udelay(1);
376 usec--;
377 } while (usec > 0);
378 return -ETIMEDOUT;
379 }
380
381 static const struct usb_ep_ops net2280_ep_ops;
382
383 static void ep_reset_228x(struct net2280_regs __iomem *regs,
384 struct net2280_ep *ep)
385 {
386 u32 tmp;
387
388 ep->desc = NULL;
389 INIT_LIST_HEAD(&ep->queue);
390
391 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
392 ep->ep.ops = &net2280_ep_ops;
393
394 /* disable the dma, irqs, endpoint... */
395 if (ep->dma) {
396 writel(0, &ep->dma->dmactl);
397 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
398 BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
399 BIT(DMA_ABORT),
400 &ep->dma->dmastat);
401
402 tmp = readl(&regs->pciirqenb0);
403 tmp &= ~BIT(ep->num);
404 writel(tmp, &regs->pciirqenb0);
405 } else {
406 tmp = readl(&regs->pciirqenb1);
407 tmp &= ~BIT((8 + ep->num)); /* completion */
408 writel(tmp, &regs->pciirqenb1);
409 }
410 writel(0, &ep->regs->ep_irqenb);
411
412 /* init to our chosen defaults, notably so that we NAK OUT
413 * packets until the driver queues a read (+note erratum 0112)
414 */
415 if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
416 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
417 BIT(SET_NAK_OUT_PACKETS) |
418 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
419 BIT(CLEAR_INTERRUPT_MODE);
420 } else {
421 /* added for 2282 */
422 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
423 BIT(CLEAR_NAK_OUT_PACKETS) |
424 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
425 BIT(CLEAR_INTERRUPT_MODE);
426 }
427
428 if (ep->num != 0) {
429 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
430 BIT(CLEAR_ENDPOINT_HALT);
431 }
432 writel(tmp, &ep->regs->ep_rsp);
433
434 /* scrub most status bits, and flush any fifo state */
435 if (ep->dev->quirks & PLX_2280)
436 tmp = BIT(FIFO_OVERFLOW) |
437 BIT(FIFO_UNDERFLOW);
438 else
439 tmp = 0;
440
441 writel(tmp | BIT(TIMEOUT) |
442 BIT(USB_STALL_SENT) |
443 BIT(USB_IN_NAK_SENT) |
444 BIT(USB_IN_ACK_RCVD) |
445 BIT(USB_OUT_PING_NAK_SENT) |
446 BIT(USB_OUT_ACK_SENT) |
447 BIT(FIFO_FLUSH) |
448 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
449 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
450 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
451 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
452 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
453 BIT(DATA_IN_TOKEN_INTERRUPT),
454 &ep->regs->ep_stat);
455
456 /* fifo size is handled separately */
457 }
458
459 static void ep_reset_338x(struct net2280_regs __iomem *regs,
460 struct net2280_ep *ep)
461 {
462 u32 tmp, dmastat;
463
464 ep->desc = NULL;
465 INIT_LIST_HEAD(&ep->queue);
466
467 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
468 ep->ep.ops = &net2280_ep_ops;
469
470 /* disable the dma, irqs, endpoint... */
471 if (ep->dma) {
472 writel(0, &ep->dma->dmactl);
473 writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
474 BIT(DMA_PAUSE_DONE_INTERRUPT) |
475 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
476 BIT(DMA_TRANSACTION_DONE_INTERRUPT),
477 /* | BIT(DMA_ABORT), */
478 &ep->dma->dmastat);
479
480 dmastat = readl(&ep->dma->dmastat);
481 if (dmastat == 0x5002) {
482 ep_warn(ep->dev, "The dmastat return = %x!!\n",
483 dmastat);
484 writel(0x5a, &ep->dma->dmastat);
485 }
486
487 tmp = readl(&regs->pciirqenb0);
488 tmp &= ~BIT(ep_bit[ep->num]);
489 writel(tmp, &regs->pciirqenb0);
490 } else {
491 if (ep->num < 5) {
492 tmp = readl(&regs->pciirqenb1);
493 tmp &= ~BIT((8 + ep->num)); /* completion */
494 writel(tmp, &regs->pciirqenb1);
495 }
496 }
497 writel(0, &ep->regs->ep_irqenb);
498
499 writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
500 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
501 BIT(FIFO_OVERFLOW) |
502 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
503 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
504 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
505 BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
506
507 tmp = readl(&ep->cfg->ep_cfg);
508 if (ep->is_in)
509 tmp &= ~USB3380_EP_CFG_MASK_IN;
510 else
511 tmp &= ~USB3380_EP_CFG_MASK_OUT;
512 writel(tmp, &ep->cfg->ep_cfg);
513 }
514
515 static void nuke(struct net2280_ep *);
516
517 static int net2280_disable(struct usb_ep *_ep)
518 {
519 struct net2280_ep *ep;
520 unsigned long flags;
521
522 ep = container_of(_ep, struct net2280_ep, ep);
523 if (!_ep || !ep->desc || _ep->name == ep0name) {
524 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
525 return -EINVAL;
526 }
527 spin_lock_irqsave(&ep->dev->lock, flags);
528 nuke(ep);
529
530 if (ep->dev->quirks & PLX_PCIE)
531 ep_reset_338x(ep->dev->regs, ep);
532 else
533 ep_reset_228x(ep->dev->regs, ep);
534
535 ep_vdbg(ep->dev, "disabled %s %s\n",
536 ep->dma ? "dma" : "pio", _ep->name);
537
538 /* synch memory views with the device */
539 (void)readl(&ep->cfg->ep_cfg);
540
541 if (!ep->dma && ep->num >= 1 && ep->num <= 4)
542 ep->dma = &ep->dev->dma[ep->num - 1];
543
544 spin_unlock_irqrestore(&ep->dev->lock, flags);
545 return 0;
546 }
547
548 /*-------------------------------------------------------------------------*/
549
550 static struct usb_request
551 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
552 {
553 struct net2280_ep *ep;
554 struct net2280_request *req;
555
556 if (!_ep) {
557 pr_err("%s: Invalid ep\n", __func__);
558 return NULL;
559 }
560 ep = container_of(_ep, struct net2280_ep, ep);
561
562 req = kzalloc(sizeof(*req), gfp_flags);
563 if (!req)
564 return NULL;
565
566 INIT_LIST_HEAD(&req->queue);
567
568 /* this dma descriptor may be swapped with the previous dummy */
569 if (ep->dma) {
570 struct net2280_dma *td;
571
572 td = dma_pool_alloc(ep->dev->requests, gfp_flags,
573 &req->td_dma);
574 if (!td) {
575 kfree(req);
576 return NULL;
577 }
578 td->dmacount = 0; /* not VALID */
579 td->dmadesc = td->dmaaddr;
580 req->td = td;
581 }
582 return &req->req;
583 }
584
585 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
586 {
587 struct net2280_ep *ep;
588 struct net2280_request *req;
589
590 ep = container_of(_ep, struct net2280_ep, ep);
591 if (!_ep || !_req) {
592 dev_err(&ep->dev->pdev->dev, "%s: Invalid ep=%p or req=%p\n",
593 __func__, _ep, _req);
594 return;
595 }
596
597 req = container_of(_req, struct net2280_request, req);
598 WARN_ON(!list_empty(&req->queue));
599 if (req->td)
600 dma_pool_free(ep->dev->requests, req->td, req->td_dma);
601 kfree(req);
602 }
603
604 /*-------------------------------------------------------------------------*/
605
606 /* load a packet into the fifo we use for usb IN transfers.
607 * works for all endpoints.
608 *
609 * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
610 * at a time, but this code is simpler because it knows it only writes
611 * one packet. ep-a..ep-d should use dma instead.
612 */
613 static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
614 {
615 struct net2280_ep_regs __iomem *regs = ep->regs;
616 u8 *buf;
617 u32 tmp;
618 unsigned count, total;
619
620 /* INVARIANT: fifo is currently empty. (testable) */
621
622 if (req) {
623 buf = req->buf + req->actual;
624 prefetch(buf);
625 total = req->length - req->actual;
626 } else {
627 total = 0;
628 buf = NULL;
629 }
630
631 /* write just one packet at a time */
632 count = ep->ep.maxpacket;
633 if (count > total) /* min() cannot be used on a bitfield */
634 count = total;
635
636 ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
637 ep->ep.name, count,
638 (count != ep->ep.maxpacket) ? " (short)" : "",
639 req);
640 while (count >= 4) {
641 /* NOTE be careful if you try to align these. fifo lines
642 * should normally be full (4 bytes) and successive partial
643 * lines are ok only in certain cases.
644 */
645 tmp = get_unaligned((u32 *)buf);
646 cpu_to_le32s(&tmp);
647 writel(tmp, &regs->ep_data);
648 buf += 4;
649 count -= 4;
650 }
651
652 /* last fifo entry is "short" unless we wrote a full packet.
653 * also explicitly validate last word in (periodic) transfers
654 * when maxpacket is not a multiple of 4 bytes.
655 */
656 if (count || total < ep->ep.maxpacket) {
657 tmp = count ? get_unaligned((u32 *)buf) : count;
658 cpu_to_le32s(&tmp);
659 set_fifo_bytecount(ep, count & 0x03);
660 writel(tmp, &regs->ep_data);
661 }
662
663 /* pci writes may still be posted */
664 }
665
666 /* work around erratum 0106: PCI and USB race over the OUT fifo.
667 * caller guarantees chiprev 0100, out endpoint is NAKing, and
668 * there's no real data in the fifo.
669 *
670 * NOTE: also used in cases where that erratum doesn't apply:
671 * where the host wrote "too much" data to us.
672 */
673 static void out_flush(struct net2280_ep *ep)
674 {
675 u32 __iomem *statp;
676 u32 tmp;
677
678 statp = &ep->regs->ep_stat;
679
680 tmp = readl(statp);
681 if (tmp & BIT(NAK_OUT_PACKETS)) {
682 ep_dbg(ep->dev, "%s %s %08x !NAK\n",
683 ep->ep.name, __func__, tmp);
684 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
685 }
686
687 writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
688 BIT(DATA_PACKET_RECEIVED_INTERRUPT),
689 statp);
690 writel(BIT(FIFO_FLUSH), statp);
691 /* Make sure that stap is written */
692 mb();
693 tmp = readl(statp);
694 if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
695 /* high speed did bulk NYET; fifo isn't filling */
696 ep->dev->gadget.speed == USB_SPEED_FULL) {
697 unsigned usec;
698
699 usec = 50; /* 64 byte bulk/interrupt */
700 handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
701 BIT(USB_OUT_PING_NAK_SENT), usec);
702 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
703 }
704 }
705
706 /* unload packet(s) from the fifo we use for usb OUT transfers.
707 * returns true iff the request completed, because of short packet
708 * or the request buffer having filled with full packets.
709 *
710 * for ep-a..ep-d this will read multiple packets out when they
711 * have been accepted.
712 */
713 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
714 {
715 struct net2280_ep_regs __iomem *regs = ep->regs;
716 u8 *buf = req->req.buf + req->req.actual;
717 unsigned count, tmp, is_short;
718 unsigned cleanup = 0, prevent = 0;
719
720 /* erratum 0106 ... packets coming in during fifo reads might
721 * be incompletely rejected. not all cases have workarounds.
722 */
723 if (ep->dev->chiprev == 0x0100 &&
724 ep->dev->gadget.speed == USB_SPEED_FULL) {
725 udelay(1);
726 tmp = readl(&ep->regs->ep_stat);
727 if ((tmp & BIT(NAK_OUT_PACKETS)))
728 cleanup = 1;
729 else if ((tmp & BIT(FIFO_FULL))) {
730 start_out_naking(ep);
731 prevent = 1;
732 }
733 /* else: hope we don't see the problem */
734 }
735
736 /* never overflow the rx buffer. the fifo reads packets until
737 * it sees a short one; we might not be ready for them all.
738 */
739 prefetchw(buf);
740 count = readl(&regs->ep_avail);
741 if (unlikely(count == 0)) {
742 udelay(1);
743 tmp = readl(&ep->regs->ep_stat);
744 count = readl(&regs->ep_avail);
745 /* handled that data already? */
746 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
747 return 0;
748 }
749
750 tmp = req->req.length - req->req.actual;
751 if (count > tmp) {
752 /* as with DMA, data overflow gets flushed */
753 if ((tmp % ep->ep.maxpacket) != 0) {
754 ep_err(ep->dev,
755 "%s out fifo %d bytes, expected %d\n",
756 ep->ep.name, count, tmp);
757 req->req.status = -EOVERFLOW;
758 cleanup = 1;
759 /* NAK_OUT_PACKETS will be set, so flushing is safe;
760 * the next read will start with the next packet
761 */
762 } /* else it's a ZLP, no worries */
763 count = tmp;
764 }
765 req->req.actual += count;
766
767 is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
768
769 ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
770 ep->ep.name, count, is_short ? " (short)" : "",
771 cleanup ? " flush" : "", prevent ? " nak" : "",
772 req, req->req.actual, req->req.length);
773
774 while (count >= 4) {
775 tmp = readl(&regs->ep_data);
776 cpu_to_le32s(&tmp);
777 put_unaligned(tmp, (u32 *)buf);
778 buf += 4;
779 count -= 4;
780 }
781 if (count) {
782 tmp = readl(&regs->ep_data);
783 /* LE conversion is implicit here: */
784 do {
785 *buf++ = (u8) tmp;
786 tmp >>= 8;
787 } while (--count);
788 }
789 if (cleanup)
790 out_flush(ep);
791 if (prevent) {
792 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
793 (void) readl(&ep->regs->ep_rsp);
794 }
795
796 return is_short || ((req->req.actual == req->req.length) &&
797 !req->req.zero);
798 }
799
800 /* fill out dma descriptor to match a given request */
801 static void fill_dma_desc(struct net2280_ep *ep,
802 struct net2280_request *req, int valid)
803 {
804 struct net2280_dma *td = req->td;
805 u32 dmacount = req->req.length;
806
807 /* don't let DMA continue after a short OUT packet,
808 * so overruns can't affect the next transfer.
809 * in case of overruns on max-size packets, we can't
810 * stop the fifo from filling but we can flush it.
811 */
812 if (ep->is_in)
813 dmacount |= BIT(DMA_DIRECTION);
814 if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
815 !(ep->dev->quirks & PLX_2280))
816 dmacount |= BIT(END_OF_CHAIN);
817
818 req->valid = valid;
819 if (valid)
820 dmacount |= BIT(VALID_BIT);
821 dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
822
823 /* td->dmadesc = previously set by caller */
824 td->dmaaddr = cpu_to_le32 (req->req.dma);
825
826 /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
827 wmb();
828 td->dmacount = cpu_to_le32(dmacount);
829 }
830
831 static const u32 dmactl_default =
832 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
833 BIT(DMA_CLEAR_COUNT_ENABLE) |
834 /* erratum 0116 workaround part 1 (use POLLING) */
835 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
836 BIT(DMA_VALID_BIT_POLLING_ENABLE) |
837 BIT(DMA_VALID_BIT_ENABLE) |
838 BIT(DMA_SCATTER_GATHER_ENABLE) |
839 /* erratum 0116 workaround part 2 (no AUTOSTART) */
840 BIT(DMA_ENABLE);
841
842 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
843 {
844 handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
845 }
846
847 static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
848 {
849 writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
850 spin_stop_dma(dma);
851 }
852
853 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
854 {
855 struct net2280_dma_regs __iomem *dma = ep->dma;
856 unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
857
858 if (!(ep->dev->quirks & PLX_2280))
859 tmp |= BIT(END_OF_CHAIN);
860
861 writel(tmp, &dma->dmacount);
862 writel(readl(&dma->dmastat), &dma->dmastat);
863
864 writel(td_dma, &dma->dmadesc);
865 if (ep->dev->quirks & PLX_PCIE)
866 dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
867 writel(dmactl, &dma->dmactl);
868
869 /* erratum 0116 workaround part 3: pci arbiter away from net2280 */
870 (void) readl(&ep->dev->pci->pcimstctl);
871
872 writel(BIT(DMA_START), &dma->dmastat);
873
874 if (!ep->is_in)
875 stop_out_naking(ep);
876 }
877
878 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
879 {
880 u32 tmp;
881 struct net2280_dma_regs __iomem *dma = ep->dma;
882
883 /* FIXME can't use DMA for ZLPs */
884
885 /* on this path we "know" there's no dma active (yet) */
886 WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
887 writel(0, &ep->dma->dmactl);
888
889 /* previous OUT packet might have been short */
890 if (!ep->is_in && (readl(&ep->regs->ep_stat) &
891 BIT(NAK_OUT_PACKETS))) {
892 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
893 &ep->regs->ep_stat);
894
895 tmp = readl(&ep->regs->ep_avail);
896 if (tmp) {
897 writel(readl(&dma->dmastat), &dma->dmastat);
898
899 /* transfer all/some fifo data */
900 writel(req->req.dma, &dma->dmaaddr);
901 tmp = min(tmp, req->req.length);
902
903 /* dma irq, faking scatterlist status */
904 req->td->dmacount = cpu_to_le32(req->req.length - tmp);
905 writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
906 &dma->dmacount);
907 req->td->dmadesc = 0;
908 req->valid = 1;
909
910 writel(BIT(DMA_ENABLE), &dma->dmactl);
911 writel(BIT(DMA_START), &dma->dmastat);
912 return;
913 }
914 }
915
916 tmp = dmactl_default;
917
918 /* force packet boundaries between dma requests, but prevent the
919 * controller from automagically writing a last "short" packet
920 * (zero length) unless the driver explicitly said to do that.
921 */
922 if (ep->is_in) {
923 if (likely((req->req.length % ep->ep.maxpacket) ||
924 req->req.zero)){
925 tmp |= BIT(DMA_FIFO_VALIDATE);
926 ep->in_fifo_validate = 1;
927 } else
928 ep->in_fifo_validate = 0;
929 }
930
931 /* init req->td, pointing to the current dummy */
932 req->td->dmadesc = cpu_to_le32 (ep->td_dma);
933 fill_dma_desc(ep, req, 1);
934
935 req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
936
937 start_queue(ep, tmp, req->td_dma);
938 }
939
940 static inline void
941 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
942 {
943 struct net2280_dma *end;
944 dma_addr_t tmp;
945
946 /* swap new dummy for old, link; fill and maybe activate */
947 end = ep->dummy;
948 ep->dummy = req->td;
949 req->td = end;
950
951 tmp = ep->td_dma;
952 ep->td_dma = req->td_dma;
953 req->td_dma = tmp;
954
955 end->dmadesc = cpu_to_le32 (ep->td_dma);
956
957 fill_dma_desc(ep, req, valid);
958 }
959
960 static void
961 done(struct net2280_ep *ep, struct net2280_request *req, int status)
962 {
963 struct net2280 *dev;
964 unsigned stopped = ep->stopped;
965
966 list_del_init(&req->queue);
967
968 if (req->req.status == -EINPROGRESS)
969 req->req.status = status;
970 else
971 status = req->req.status;
972
973 dev = ep->dev;
974 if (ep->dma)
975 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
976
977 if (status && status != -ESHUTDOWN)
978 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
979 ep->ep.name, &req->req, status,
980 req->req.actual, req->req.length);
981
982 /* don't modify queue heads during completion callback */
983 ep->stopped = 1;
984 spin_unlock(&dev->lock);
985 usb_gadget_giveback_request(&ep->ep, &req->req);
986 spin_lock(&dev->lock);
987 ep->stopped = stopped;
988 }
989
990 /*-------------------------------------------------------------------------*/
991
992 static int
993 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
994 {
995 struct net2280_request *req;
996 struct net2280_ep *ep;
997 struct net2280 *dev;
998 unsigned long flags;
999 int ret = 0;
1000
1001 /* we always require a cpu-view buffer, so that we can
1002 * always use pio (as fallback or whatever).
1003 */
1004 ep = container_of(_ep, struct net2280_ep, ep);
1005 if (!_ep || (!ep->desc && ep->num != 0)) {
1006 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1007 return -EINVAL;
1008 }
1009 req = container_of(_req, struct net2280_request, req);
1010 if (!_req || !_req->complete || !_req->buf ||
1011 !list_empty(&req->queue)) {
1012 ret = -EINVAL;
1013 goto print_err;
1014 }
1015 if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1016 ret = -EDOM;
1017 goto print_err;
1018 }
1019 dev = ep->dev;
1020 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1021 ret = -ESHUTDOWN;
1022 goto print_err;
1023 }
1024
1025 /* FIXME implement PIO fallback for ZLPs with DMA */
1026 if (ep->dma && _req->length == 0) {
1027 ret = -EOPNOTSUPP;
1028 goto print_err;
1029 }
1030
1031 /* set up dma mapping in case the caller didn't */
1032 if (ep->dma) {
1033 ret = usb_gadget_map_request(&dev->gadget, _req,
1034 ep->is_in);
1035 if (ret)
1036 goto print_err;
1037 }
1038
1039 ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1040 _ep->name, _req, _req->length, _req->buf);
1041
1042 spin_lock_irqsave(&dev->lock, flags);
1043
1044 _req->status = -EINPROGRESS;
1045 _req->actual = 0;
1046
1047 /* kickstart this i/o queue? */
1048 if (list_empty(&ep->queue) && !ep->stopped &&
1049 !((dev->quirks & PLX_PCIE) && ep->dma &&
1050 (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1051
1052 /* use DMA if the endpoint supports it, else pio */
1053 if (ep->dma)
1054 start_dma(ep, req);
1055 else {
1056 /* maybe there's no control data, just status ack */
1057 if (ep->num == 0 && _req->length == 0) {
1058 allow_status(ep);
1059 done(ep, req, 0);
1060 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1061 goto done;
1062 }
1063
1064 /* PIO ... stuff the fifo, or unblock it. */
1065 if (ep->is_in)
1066 write_fifo(ep, _req);
1067 else if (list_empty(&ep->queue)) {
1068 u32 s;
1069
1070 /* OUT FIFO might have packet(s) buffered */
1071 s = readl(&ep->regs->ep_stat);
1072 if ((s & BIT(FIFO_EMPTY)) == 0) {
1073 /* note: _req->short_not_ok is
1074 * ignored here since PIO _always_
1075 * stops queue advance here, and
1076 * _req->status doesn't change for
1077 * short reads (only _req->actual)
1078 */
1079 if (read_fifo(ep, req) &&
1080 ep->num == 0) {
1081 done(ep, req, 0);
1082 allow_status(ep);
1083 /* don't queue it */
1084 req = NULL;
1085 } else if (read_fifo(ep, req) &&
1086 ep->num != 0) {
1087 done(ep, req, 0);
1088 req = NULL;
1089 } else
1090 s = readl(&ep->regs->ep_stat);
1091 }
1092
1093 /* don't NAK, let the fifo fill */
1094 if (req && (s & BIT(NAK_OUT_PACKETS)))
1095 writel(BIT(CLEAR_NAK_OUT_PACKETS),
1096 &ep->regs->ep_rsp);
1097 }
1098 }
1099
1100 } else if (ep->dma) {
1101 int valid = 1;
1102
1103 if (ep->is_in) {
1104 int expect;
1105
1106 /* preventing magic zlps is per-engine state, not
1107 * per-transfer; irq logic must recover hiccups.
1108 */
1109 expect = likely(req->req.zero ||
1110 (req->req.length % ep->ep.maxpacket));
1111 if (expect != ep->in_fifo_validate)
1112 valid = 0;
1113 }
1114 queue_dma(ep, req, valid);
1115
1116 } /* else the irq handler advances the queue. */
1117
1118 ep->responded = 1;
1119 if (req)
1120 list_add_tail(&req->queue, &ep->queue);
1121 done:
1122 spin_unlock_irqrestore(&dev->lock, flags);
1123
1124 /* pci writes may still be posted */
1125 return ret;
1126
1127 print_err:
1128 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1129 return ret;
1130 }
1131
1132 static inline void
1133 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1134 int status)
1135 {
1136 req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1137 done(ep, req, status);
1138 }
1139
1140 static int scan_dma_completions(struct net2280_ep *ep)
1141 {
1142 int num_completed = 0;
1143
1144 /* only look at descriptors that were "naturally" retired,
1145 * so fifo and list head state won't matter
1146 */
1147 while (!list_empty(&ep->queue)) {
1148 struct net2280_request *req;
1149 u32 req_dma_count;
1150
1151 req = list_entry(ep->queue.next,
1152 struct net2280_request, queue);
1153 if (!req->valid)
1154 break;
1155 rmb();
1156 req_dma_count = le32_to_cpup(&req->td->dmacount);
1157 if ((req_dma_count & BIT(VALID_BIT)) != 0)
1158 break;
1159
1160 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1161 * cases where DMA must be aborted; this code handles
1162 * all non-abort DMA completions.
1163 */
1164 if (unlikely(req->td->dmadesc == 0)) {
1165 /* paranoia */
1166 u32 const ep_dmacount = readl(&ep->dma->dmacount);
1167
1168 if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1169 break;
1170 /* single transfer mode */
1171 dma_done(ep, req, req_dma_count, 0);
1172 num_completed++;
1173 break;
1174 } else if (!ep->is_in &&
1175 (req->req.length % ep->ep.maxpacket) &&
1176 !(ep->dev->quirks & PLX_PCIE)) {
1177
1178 u32 const ep_stat = readl(&ep->regs->ep_stat);
1179 /* AVOID TROUBLE HERE by not issuing short reads from
1180 * your gadget driver. That helps avoids errata 0121,
1181 * 0122, and 0124; not all cases trigger the warning.
1182 */
1183 if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) {
1184 ep_warn(ep->dev, "%s lost packet sync!\n",
1185 ep->ep.name);
1186 req->req.status = -EOVERFLOW;
1187 } else {
1188 u32 const ep_avail = readl(&ep->regs->ep_avail);
1189 if (ep_avail) {
1190 /* fifo gets flushed later */
1191 ep->out_overflow = 1;
1192 ep_dbg(ep->dev,
1193 "%s dma, discard %d len %d\n",
1194 ep->ep.name, ep_avail,
1195 req->req.length);
1196 req->req.status = -EOVERFLOW;
1197 }
1198 }
1199 }
1200 dma_done(ep, req, req_dma_count, 0);
1201 num_completed++;
1202 }
1203
1204 return num_completed;
1205 }
1206
1207 static void restart_dma(struct net2280_ep *ep)
1208 {
1209 struct net2280_request *req;
1210
1211 if (ep->stopped)
1212 return;
1213 req = list_entry(ep->queue.next, struct net2280_request, queue);
1214
1215 start_dma(ep, req);
1216 }
1217
1218 static void abort_dma(struct net2280_ep *ep)
1219 {
1220 /* abort the current transfer */
1221 if (likely(!list_empty(&ep->queue))) {
1222 /* FIXME work around errata 0121, 0122, 0124 */
1223 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1224 spin_stop_dma(ep->dma);
1225 } else
1226 stop_dma(ep->dma);
1227 scan_dma_completions(ep);
1228 }
1229
1230 /* dequeue ALL requests */
1231 static void nuke(struct net2280_ep *ep)
1232 {
1233 struct net2280_request *req;
1234
1235 /* called with spinlock held */
1236 ep->stopped = 1;
1237 if (ep->dma)
1238 abort_dma(ep);
1239 while (!list_empty(&ep->queue)) {
1240 req = list_entry(ep->queue.next,
1241 struct net2280_request,
1242 queue);
1243 done(ep, req, -ESHUTDOWN);
1244 }
1245 }
1246
1247 /* dequeue JUST ONE request */
1248 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1249 {
1250 struct net2280_ep *ep;
1251 struct net2280_request *req;
1252 unsigned long flags;
1253 u32 dmactl;
1254 int stopped;
1255
1256 ep = container_of(_ep, struct net2280_ep, ep);
1257 if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1258 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1259 __func__, _ep, _req);
1260 return -EINVAL;
1261 }
1262
1263 spin_lock_irqsave(&ep->dev->lock, flags);
1264 stopped = ep->stopped;
1265
1266 /* quiesce dma while we patch the queue */
1267 dmactl = 0;
1268 ep->stopped = 1;
1269 if (ep->dma) {
1270 dmactl = readl(&ep->dma->dmactl);
1271 /* WARNING erratum 0127 may kick in ... */
1272 stop_dma(ep->dma);
1273 scan_dma_completions(ep);
1274 }
1275
1276 /* make sure it's still queued on this endpoint */
1277 list_for_each_entry(req, &ep->queue, queue) {
1278 if (&req->req == _req)
1279 break;
1280 }
1281 if (&req->req != _req) {
1282 spin_unlock_irqrestore(&ep->dev->lock, flags);
1283 dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
1284 __func__);
1285 return -EINVAL;
1286 }
1287
1288 /* queue head may be partially complete. */
1289 if (ep->queue.next == &req->queue) {
1290 if (ep->dma) {
1291 ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1292 _req->status = -ECONNRESET;
1293 abort_dma(ep);
1294 if (likely(ep->queue.next == &req->queue)) {
1295 /* NOTE: misreports single-transfer mode*/
1296 req->td->dmacount = 0; /* invalidate */
1297 dma_done(ep, req,
1298 readl(&ep->dma->dmacount),
1299 -ECONNRESET);
1300 }
1301 } else {
1302 ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1303 done(ep, req, -ECONNRESET);
1304 }
1305 req = NULL;
1306 }
1307
1308 if (req)
1309 done(ep, req, -ECONNRESET);
1310 ep->stopped = stopped;
1311
1312 if (ep->dma) {
1313 /* turn off dma on inactive queues */
1314 if (list_empty(&ep->queue))
1315 stop_dma(ep->dma);
1316 else if (!ep->stopped) {
1317 /* resume current request, or start new one */
1318 if (req)
1319 writel(dmactl, &ep->dma->dmactl);
1320 else
1321 start_dma(ep, list_entry(ep->queue.next,
1322 struct net2280_request, queue));
1323 }
1324 }
1325
1326 spin_unlock_irqrestore(&ep->dev->lock, flags);
1327 return 0;
1328 }
1329
1330 /*-------------------------------------------------------------------------*/
1331
1332 static int net2280_fifo_status(struct usb_ep *_ep);
1333
1334 static int
1335 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1336 {
1337 struct net2280_ep *ep;
1338 unsigned long flags;
1339 int retval = 0;
1340
1341 ep = container_of(_ep, struct net2280_ep, ep);
1342 if (!_ep || (!ep->desc && ep->num != 0)) {
1343 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1344 return -EINVAL;
1345 }
1346 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1347 retval = -ESHUTDOWN;
1348 goto print_err;
1349 }
1350 if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1351 == USB_ENDPOINT_XFER_ISOC) {
1352 retval = -EINVAL;
1353 goto print_err;
1354 }
1355
1356 spin_lock_irqsave(&ep->dev->lock, flags);
1357 if (!list_empty(&ep->queue)) {
1358 retval = -EAGAIN;
1359 goto print_unlock;
1360 } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1361 retval = -EAGAIN;
1362 goto print_unlock;
1363 } else {
1364 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1365 value ? "set" : "clear",
1366 wedged ? "wedge" : "halt");
1367 /* set/clear, then synch memory views with the device */
1368 if (value) {
1369 if (ep->num == 0)
1370 ep->dev->protocol_stall = 1;
1371 else
1372 set_halt(ep);
1373 if (wedged)
1374 ep->wedged = 1;
1375 } else {
1376 clear_halt(ep);
1377 if (ep->dev->quirks & PLX_PCIE &&
1378 !list_empty(&ep->queue) && ep->td_dma)
1379 restart_dma(ep);
1380 ep->wedged = 0;
1381 }
1382 (void) readl(&ep->regs->ep_rsp);
1383 }
1384 spin_unlock_irqrestore(&ep->dev->lock, flags);
1385
1386 return retval;
1387
1388 print_unlock:
1389 spin_unlock_irqrestore(&ep->dev->lock, flags);
1390 print_err:
1391 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1392 return retval;
1393 }
1394
1395 static int net2280_set_halt(struct usb_ep *_ep, int value)
1396 {
1397 return net2280_set_halt_and_wedge(_ep, value, 0);
1398 }
1399
1400 static int net2280_set_wedge(struct usb_ep *_ep)
1401 {
1402 if (!_ep || _ep->name == ep0name) {
1403 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1404 return -EINVAL;
1405 }
1406 return net2280_set_halt_and_wedge(_ep, 1, 1);
1407 }
1408
1409 static int net2280_fifo_status(struct usb_ep *_ep)
1410 {
1411 struct net2280_ep *ep;
1412 u32 avail;
1413
1414 ep = container_of(_ep, struct net2280_ep, ep);
1415 if (!_ep || (!ep->desc && ep->num != 0)) {
1416 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1417 return -ENODEV;
1418 }
1419 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1420 dev_err(&ep->dev->pdev->dev,
1421 "%s: Invalid driver=%p or speed=%d\n",
1422 __func__, ep->dev->driver, ep->dev->gadget.speed);
1423 return -ESHUTDOWN;
1424 }
1425
1426 avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1427 if (avail > ep->fifo_size) {
1428 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1429 return -EOVERFLOW;
1430 }
1431 if (ep->is_in)
1432 avail = ep->fifo_size - avail;
1433 return avail;
1434 }
1435
1436 static void net2280_fifo_flush(struct usb_ep *_ep)
1437 {
1438 struct net2280_ep *ep;
1439
1440 ep = container_of(_ep, struct net2280_ep, ep);
1441 if (!_ep || (!ep->desc && ep->num != 0)) {
1442 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1443 return;
1444 }
1445 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1446 dev_err(&ep->dev->pdev->dev,
1447 "%s: Invalid driver=%p or speed=%d\n",
1448 __func__, ep->dev->driver, ep->dev->gadget.speed);
1449 return;
1450 }
1451
1452 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1453 (void) readl(&ep->regs->ep_rsp);
1454 }
1455
1456 static const struct usb_ep_ops net2280_ep_ops = {
1457 .enable = net2280_enable,
1458 .disable = net2280_disable,
1459
1460 .alloc_request = net2280_alloc_request,
1461 .free_request = net2280_free_request,
1462
1463 .queue = net2280_queue,
1464 .dequeue = net2280_dequeue,
1465
1466 .set_halt = net2280_set_halt,
1467 .set_wedge = net2280_set_wedge,
1468 .fifo_status = net2280_fifo_status,
1469 .fifo_flush = net2280_fifo_flush,
1470 };
1471
1472 /*-------------------------------------------------------------------------*/
1473
1474 static int net2280_get_frame(struct usb_gadget *_gadget)
1475 {
1476 struct net2280 *dev;
1477 unsigned long flags;
1478 u16 retval;
1479
1480 if (!_gadget)
1481 return -ENODEV;
1482 dev = container_of(_gadget, struct net2280, gadget);
1483 spin_lock_irqsave(&dev->lock, flags);
1484 retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1485 spin_unlock_irqrestore(&dev->lock, flags);
1486 return retval;
1487 }
1488
1489 static int net2280_wakeup(struct usb_gadget *_gadget)
1490 {
1491 struct net2280 *dev;
1492 u32 tmp;
1493 unsigned long flags;
1494
1495 if (!_gadget)
1496 return 0;
1497 dev = container_of(_gadget, struct net2280, gadget);
1498
1499 spin_lock_irqsave(&dev->lock, flags);
1500 tmp = readl(&dev->usb->usbctl);
1501 if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1502 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1503 spin_unlock_irqrestore(&dev->lock, flags);
1504
1505 /* pci writes may still be posted */
1506 return 0;
1507 }
1508
1509 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1510 {
1511 struct net2280 *dev;
1512 u32 tmp;
1513 unsigned long flags;
1514
1515 if (!_gadget)
1516 return 0;
1517 dev = container_of(_gadget, struct net2280, gadget);
1518
1519 spin_lock_irqsave(&dev->lock, flags);
1520 tmp = readl(&dev->usb->usbctl);
1521 if (value) {
1522 tmp |= BIT(SELF_POWERED_STATUS);
1523 _gadget->is_selfpowered = 1;
1524 } else {
1525 tmp &= ~BIT(SELF_POWERED_STATUS);
1526 _gadget->is_selfpowered = 0;
1527 }
1528 writel(tmp, &dev->usb->usbctl);
1529 spin_unlock_irqrestore(&dev->lock, flags);
1530
1531 return 0;
1532 }
1533
1534 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1535 {
1536 struct net2280 *dev;
1537 u32 tmp;
1538 unsigned long flags;
1539
1540 if (!_gadget)
1541 return -ENODEV;
1542 dev = container_of(_gadget, struct net2280, gadget);
1543
1544 spin_lock_irqsave(&dev->lock, flags);
1545 tmp = readl(&dev->usb->usbctl);
1546 dev->softconnect = (is_on != 0);
1547 if (is_on) {
1548 ep0_start(dev);
1549 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1550 } else {
1551 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1552 stop_activity(dev, dev->driver);
1553 }
1554
1555 spin_unlock_irqrestore(&dev->lock, flags);
1556
1557 return 0;
1558 }
1559
1560 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1561 struct usb_endpoint_descriptor *desc,
1562 struct usb_ss_ep_comp_descriptor *ep_comp)
1563 {
1564 char name[8];
1565 struct usb_ep *ep;
1566
1567 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1568 /* ep-e, ep-f are PIO with only 64 byte fifos */
1569 ep = gadget_find_ep_by_name(_gadget, "ep-e");
1570 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1571 return ep;
1572 ep = gadget_find_ep_by_name(_gadget, "ep-f");
1573 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1574 return ep;
1575 }
1576
1577 /* USB3380: Only first four endpoints have DMA channels. Allocate
1578 * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1579 * endpoints use DMA hw endpoints.
1580 */
1581 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1582 usb_endpoint_dir_in(desc)) {
1583 ep = gadget_find_ep_by_name(_gadget, "ep2in");
1584 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1585 return ep;
1586 ep = gadget_find_ep_by_name(_gadget, "ep4in");
1587 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1588 return ep;
1589 } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1590 !usb_endpoint_dir_in(desc)) {
1591 ep = gadget_find_ep_by_name(_gadget, "ep1out");
1592 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1593 return ep;
1594 ep = gadget_find_ep_by_name(_gadget, "ep3out");
1595 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1596 return ep;
1597 } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1598 usb_endpoint_dir_in(desc)) {
1599 ep = gadget_find_ep_by_name(_gadget, "ep1in");
1600 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1601 return ep;
1602 ep = gadget_find_ep_by_name(_gadget, "ep3in");
1603 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1604 return ep;
1605 } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1606 !usb_endpoint_dir_in(desc)) {
1607 ep = gadget_find_ep_by_name(_gadget, "ep2out");
1608 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1609 return ep;
1610 ep = gadget_find_ep_by_name(_gadget, "ep4out");
1611 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1612 return ep;
1613 }
1614
1615 /* USB3380: use same address for usb and hardware endpoints */
1616 snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1617 usb_endpoint_dir_in(desc) ? "in" : "out");
1618 ep = gadget_find_ep_by_name(_gadget, name);
1619 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1620 return ep;
1621
1622 return NULL;
1623 }
1624
1625 static int net2280_start(struct usb_gadget *_gadget,
1626 struct usb_gadget_driver *driver);
1627 static int net2280_stop(struct usb_gadget *_gadget);
1628
1629 static const struct usb_gadget_ops net2280_ops = {
1630 .get_frame = net2280_get_frame,
1631 .wakeup = net2280_wakeup,
1632 .set_selfpowered = net2280_set_selfpowered,
1633 .pullup = net2280_pullup,
1634 .udc_start = net2280_start,
1635 .udc_stop = net2280_stop,
1636 .match_ep = net2280_match_ep,
1637 };
1638
1639 /*-------------------------------------------------------------------------*/
1640
1641 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1642
1643 /* FIXME move these into procfs, and use seq_file.
1644 * Sysfs _still_ doesn't behave for arbitrarily sized files,
1645 * and also doesn't help products using this with 2.4 kernels.
1646 */
1647
1648 /* "function" sysfs attribute */
1649 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1650 char *buf)
1651 {
1652 struct net2280 *dev = dev_get_drvdata(_dev);
1653
1654 if (!dev->driver || !dev->driver->function ||
1655 strlen(dev->driver->function) > PAGE_SIZE)
1656 return 0;
1657 return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1658 }
1659 static DEVICE_ATTR_RO(function);
1660
1661 static ssize_t registers_show(struct device *_dev,
1662 struct device_attribute *attr, char *buf)
1663 {
1664 struct net2280 *dev;
1665 char *next;
1666 unsigned size, t;
1667 unsigned long flags;
1668 int i;
1669 u32 t1, t2;
1670 const char *s;
1671
1672 dev = dev_get_drvdata(_dev);
1673 next = buf;
1674 size = PAGE_SIZE;
1675 spin_lock_irqsave(&dev->lock, flags);
1676
1677 if (dev->driver)
1678 s = dev->driver->driver.name;
1679 else
1680 s = "(none)";
1681
1682 /* Main Control Registers */
1683 t = scnprintf(next, size, "%s version " DRIVER_VERSION
1684 ", chiprev %04x\n\n"
1685 "devinit %03x fifoctl %08x gadget '%s'\n"
1686 "pci irqenb0 %02x irqenb1 %08x "
1687 "irqstat0 %04x irqstat1 %08x\n",
1688 driver_name, dev->chiprev,
1689 readl(&dev->regs->devinit),
1690 readl(&dev->regs->fifoctl),
1691 s,
1692 readl(&dev->regs->pciirqenb0),
1693 readl(&dev->regs->pciirqenb1),
1694 readl(&dev->regs->irqstat0),
1695 readl(&dev->regs->irqstat1));
1696 size -= t;
1697 next += t;
1698
1699 /* USB Control Registers */
1700 t1 = readl(&dev->usb->usbctl);
1701 t2 = readl(&dev->usb->usbstat);
1702 if (t1 & BIT(VBUS_PIN)) {
1703 if (t2 & BIT(HIGH_SPEED))
1704 s = "high speed";
1705 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1706 s = "powered";
1707 else
1708 s = "full speed";
1709 /* full speed bit (6) not working?? */
1710 } else
1711 s = "not attached";
1712 t = scnprintf(next, size,
1713 "stdrsp %08x usbctl %08x usbstat %08x "
1714 "addr 0x%02x (%s)\n",
1715 readl(&dev->usb->stdrsp), t1, t2,
1716 readl(&dev->usb->ouraddr), s);
1717 size -= t;
1718 next += t;
1719
1720 /* PCI Master Control Registers */
1721
1722 /* DMA Control Registers */
1723
1724 /* Configurable EP Control Registers */
1725 for (i = 0; i < dev->n_ep; i++) {
1726 struct net2280_ep *ep;
1727
1728 ep = &dev->ep[i];
1729 if (i && !ep->desc)
1730 continue;
1731
1732 t1 = readl(&ep->cfg->ep_cfg);
1733 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1734 t = scnprintf(next, size,
1735 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1736 "irqenb %02x\n",
1737 ep->ep.name, t1, t2,
1738 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1739 ? "NAK " : "",
1740 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1741 ? "hide " : "",
1742 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1743 ? "CRC " : "",
1744 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1745 ? "interrupt " : "",
1746 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1747 ? "status " : "",
1748 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1749 ? "NAKmode " : "",
1750 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1751 ? "DATA1 " : "DATA0 ",
1752 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1753 ? "HALT " : "",
1754 readl(&ep->regs->ep_irqenb));
1755 size -= t;
1756 next += t;
1757
1758 t = scnprintf(next, size,
1759 "\tstat %08x avail %04x "
1760 "(ep%d%s-%s)%s\n",
1761 readl(&ep->regs->ep_stat),
1762 readl(&ep->regs->ep_avail),
1763 t1 & 0x0f, DIR_STRING(t1),
1764 type_string(t1 >> 8),
1765 ep->stopped ? "*" : "");
1766 size -= t;
1767 next += t;
1768
1769 if (!ep->dma)
1770 continue;
1771
1772 t = scnprintf(next, size,
1773 " dma\tctl %08x stat %08x count %08x\n"
1774 "\taddr %08x desc %08x\n",
1775 readl(&ep->dma->dmactl),
1776 readl(&ep->dma->dmastat),
1777 readl(&ep->dma->dmacount),
1778 readl(&ep->dma->dmaaddr),
1779 readl(&ep->dma->dmadesc));
1780 size -= t;
1781 next += t;
1782
1783 }
1784
1785 /* Indexed Registers (none yet) */
1786
1787 /* Statistics */
1788 t = scnprintf(next, size, "\nirqs: ");
1789 size -= t;
1790 next += t;
1791 for (i = 0; i < dev->n_ep; i++) {
1792 struct net2280_ep *ep;
1793
1794 ep = &dev->ep[i];
1795 if (i && !ep->irqs)
1796 continue;
1797 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1798 size -= t;
1799 next += t;
1800
1801 }
1802 t = scnprintf(next, size, "\n");
1803 size -= t;
1804 next += t;
1805
1806 spin_unlock_irqrestore(&dev->lock, flags);
1807
1808 return PAGE_SIZE - size;
1809 }
1810 static DEVICE_ATTR_RO(registers);
1811
1812 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1813 char *buf)
1814 {
1815 struct net2280 *dev;
1816 char *next;
1817 unsigned size;
1818 unsigned long flags;
1819 int i;
1820
1821 dev = dev_get_drvdata(_dev);
1822 next = buf;
1823 size = PAGE_SIZE;
1824 spin_lock_irqsave(&dev->lock, flags);
1825
1826 for (i = 0; i < dev->n_ep; i++) {
1827 struct net2280_ep *ep = &dev->ep[i];
1828 struct net2280_request *req;
1829 int t;
1830
1831 if (i != 0) {
1832 const struct usb_endpoint_descriptor *d;
1833
1834 d = ep->desc;
1835 if (!d)
1836 continue;
1837 t = d->bEndpointAddress;
1838 t = scnprintf(next, size,
1839 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1840 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1841 (t & USB_DIR_IN) ? "in" : "out",
1842 type_string(d->bmAttributes),
1843 usb_endpoint_maxp(d),
1844 ep->dma ? "dma" : "pio", ep->fifo_size
1845 );
1846 } else /* ep0 should only have one transfer queued */
1847 t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1848 ep->is_in ? "in" : "out");
1849 if (t <= 0 || t > size)
1850 goto done;
1851 size -= t;
1852 next += t;
1853
1854 if (list_empty(&ep->queue)) {
1855 t = scnprintf(next, size, "\t(nothing queued)\n");
1856 if (t <= 0 || t > size)
1857 goto done;
1858 size -= t;
1859 next += t;
1860 continue;
1861 }
1862 list_for_each_entry(req, &ep->queue, queue) {
1863 if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1864 t = scnprintf(next, size,
1865 "\treq %p len %d/%d "
1866 "buf %p (dmacount %08x)\n",
1867 &req->req, req->req.actual,
1868 req->req.length, req->req.buf,
1869 readl(&ep->dma->dmacount));
1870 else
1871 t = scnprintf(next, size,
1872 "\treq %p len %d/%d buf %p\n",
1873 &req->req, req->req.actual,
1874 req->req.length, req->req.buf);
1875 if (t <= 0 || t > size)
1876 goto done;
1877 size -= t;
1878 next += t;
1879
1880 if (ep->dma) {
1881 struct net2280_dma *td;
1882
1883 td = req->td;
1884 t = scnprintf(next, size, "\t td %08x "
1885 " count %08x buf %08x desc %08x\n",
1886 (u32) req->td_dma,
1887 le32_to_cpu(td->dmacount),
1888 le32_to_cpu(td->dmaaddr),
1889 le32_to_cpu(td->dmadesc));
1890 if (t <= 0 || t > size)
1891 goto done;
1892 size -= t;
1893 next += t;
1894 }
1895 }
1896 }
1897
1898 done:
1899 spin_unlock_irqrestore(&dev->lock, flags);
1900 return PAGE_SIZE - size;
1901 }
1902 static DEVICE_ATTR_RO(queues);
1903
1904
1905 #else
1906
1907 #define device_create_file(a, b) (0)
1908 #define device_remove_file(a, b) do { } while (0)
1909
1910 #endif
1911
1912 /*-------------------------------------------------------------------------*/
1913
1914 /* another driver-specific mode might be a request type doing dma
1915 * to/from another device fifo instead of to/from memory.
1916 */
1917
1918 static void set_fifo_mode(struct net2280 *dev, int mode)
1919 {
1920 /* keeping high bits preserves BAR2 */
1921 writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1922
1923 /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1924 INIT_LIST_HEAD(&dev->gadget.ep_list);
1925 list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1926 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1927 switch (mode) {
1928 case 0:
1929 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1930 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1931 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1932 break;
1933 case 1:
1934 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1935 break;
1936 case 2:
1937 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1938 dev->ep[1].fifo_size = 2048;
1939 dev->ep[2].fifo_size = 1024;
1940 break;
1941 }
1942 /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1943 list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1944 list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1945 }
1946
1947 static void defect7374_disable_data_eps(struct net2280 *dev)
1948 {
1949 /*
1950 * For Defect 7374, disable data EPs (and more):
1951 * - This phase undoes the earlier phase of the Defect 7374 workaround,
1952 * returing ep regs back to normal.
1953 */
1954 struct net2280_ep *ep;
1955 int i;
1956 unsigned char ep_sel;
1957 u32 tmp_reg;
1958
1959 for (i = 1; i < 5; i++) {
1960 ep = &dev->ep[i];
1961 writel(i, &ep->cfg->ep_cfg);
1962 }
1963
1964 /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1965 for (i = 0; i < 6; i++)
1966 writel(0, &dev->dep[i].dep_cfg);
1967
1968 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1969 /* Select an endpoint for subsequent operations: */
1970 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1971 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1972
1973 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1974 ep_sel == 18 || ep_sel == 20)
1975 continue;
1976
1977 /* Change settings on some selected endpoints */
1978 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1979 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1980 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1981 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1982 tmp_reg |= BIT(EP_INITIALIZED);
1983 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1984 }
1985 }
1986
1987 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1988 {
1989 u32 tmp = 0, tmp_reg;
1990 u32 scratch;
1991 int i;
1992 unsigned char ep_sel;
1993
1994 scratch = get_idx_reg(dev->regs, SCRATCH);
1995
1996 WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1997 == DEFECT7374_FSM_SS_CONTROL_READ);
1998
1999 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2000
2001 ep_warn(dev, "Operate Defect 7374 workaround soft this time");
2002 ep_warn(dev, "It will operate on cold-reboot and SS connect");
2003
2004 /*GPEPs:*/
2005 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
2006 (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
2007 ((dev->enhanced_mode) ?
2008 BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
2009 BIT(ENDPOINT_ENABLE)));
2010
2011 for (i = 1; i < 5; i++)
2012 writel(tmp, &dev->ep[i].cfg->ep_cfg);
2013
2014 /* CSRIN, PCIIN, STATIN, RCIN*/
2015 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2016 writel(tmp, &dev->dep[1].dep_cfg);
2017 writel(tmp, &dev->dep[3].dep_cfg);
2018 writel(tmp, &dev->dep[4].dep_cfg);
2019 writel(tmp, &dev->dep[5].dep_cfg);
2020
2021 /*Implemented for development and debug.
2022 * Can be refined/tuned later.*/
2023 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2024 /* Select an endpoint for subsequent operations: */
2025 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2026 writel(((tmp_reg & ~0x1f) | ep_sel),
2027 &dev->plregs->pl_ep_ctrl);
2028
2029 if (ep_sel == 1) {
2030 tmp =
2031 (readl(&dev->plregs->pl_ep_ctrl) |
2032 BIT(CLEAR_ACK_ERROR_CODE) | 0);
2033 writel(tmp, &dev->plregs->pl_ep_ctrl);
2034 continue;
2035 }
2036
2037 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2038 ep_sel == 18 || ep_sel == 20)
2039 continue;
2040
2041 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2042 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2043 writel(tmp, &dev->plregs->pl_ep_cfg_4);
2044
2045 tmp = readl(&dev->plregs->pl_ep_ctrl) &
2046 ~BIT(EP_INITIALIZED);
2047 writel(tmp, &dev->plregs->pl_ep_ctrl);
2048
2049 }
2050
2051 /* Set FSM to focus on the first Control Read:
2052 * - Tip: Connection speed is known upon the first
2053 * setup request.*/
2054 scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2055 set_idx_reg(dev->regs, SCRATCH, scratch);
2056
2057 }
2058
2059 /* keeping it simple:
2060 * - one bus driver, initted first;
2061 * - one function driver, initted second
2062 *
2063 * most of the work to support multiple net2280 controllers would
2064 * be to associate this gadget driver (yes?) with all of them, or
2065 * perhaps to bind specific drivers to specific devices.
2066 */
2067
2068 static void usb_reset_228x(struct net2280 *dev)
2069 {
2070 u32 tmp;
2071
2072 dev->gadget.speed = USB_SPEED_UNKNOWN;
2073 (void) readl(&dev->usb->usbctl);
2074
2075 net2280_led_init(dev);
2076
2077 /* disable automatic responses, and irqs */
2078 writel(0, &dev->usb->stdrsp);
2079 writel(0, &dev->regs->pciirqenb0);
2080 writel(0, &dev->regs->pciirqenb1);
2081
2082 /* clear old dma and irq state */
2083 for (tmp = 0; tmp < 4; tmp++) {
2084 struct net2280_ep *ep = &dev->ep[tmp + 1];
2085 if (ep->dma)
2086 abort_dma(ep);
2087 }
2088
2089 writel(~0, &dev->regs->irqstat0),
2090 writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2091
2092 /* reset, and enable pci */
2093 tmp = readl(&dev->regs->devinit) |
2094 BIT(PCI_ENABLE) |
2095 BIT(FIFO_SOFT_RESET) |
2096 BIT(USB_SOFT_RESET) |
2097 BIT(M8051_RESET);
2098 writel(tmp, &dev->regs->devinit);
2099
2100 /* standard fifo and endpoint allocations */
2101 set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2102 }
2103
2104 static void usb_reset_338x(struct net2280 *dev)
2105 {
2106 u32 tmp;
2107
2108 dev->gadget.speed = USB_SPEED_UNKNOWN;
2109 (void)readl(&dev->usb->usbctl);
2110
2111 net2280_led_init(dev);
2112
2113 if (dev->bug7734_patched) {
2114 /* disable automatic responses, and irqs */
2115 writel(0, &dev->usb->stdrsp);
2116 writel(0, &dev->regs->pciirqenb0);
2117 writel(0, &dev->regs->pciirqenb1);
2118 }
2119
2120 /* clear old dma and irq state */
2121 for (tmp = 0; tmp < 4; tmp++) {
2122 struct net2280_ep *ep = &dev->ep[tmp + 1];
2123 struct net2280_dma_regs __iomem *dma;
2124
2125 if (ep->dma) {
2126 abort_dma(ep);
2127 } else {
2128 dma = &dev->dma[tmp];
2129 writel(BIT(DMA_ABORT), &dma->dmastat);
2130 writel(0, &dma->dmactl);
2131 }
2132 }
2133
2134 writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2135
2136 if (dev->bug7734_patched) {
2137 /* reset, and enable pci */
2138 tmp = readl(&dev->regs->devinit) |
2139 BIT(PCI_ENABLE) |
2140 BIT(FIFO_SOFT_RESET) |
2141 BIT(USB_SOFT_RESET) |
2142 BIT(M8051_RESET);
2143
2144 writel(tmp, &dev->regs->devinit);
2145 }
2146
2147 /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2148 INIT_LIST_HEAD(&dev->gadget.ep_list);
2149
2150 for (tmp = 1; tmp < dev->n_ep; tmp++)
2151 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2152
2153 }
2154
2155 static void usb_reset(struct net2280 *dev)
2156 {
2157 if (dev->quirks & PLX_LEGACY)
2158 return usb_reset_228x(dev);
2159 return usb_reset_338x(dev);
2160 }
2161
2162 static void usb_reinit_228x(struct net2280 *dev)
2163 {
2164 u32 tmp;
2165
2166 /* basic endpoint init */
2167 for (tmp = 0; tmp < 7; tmp++) {
2168 struct net2280_ep *ep = &dev->ep[tmp];
2169
2170 ep->ep.name = ep_info_dft[tmp].name;
2171 ep->ep.caps = ep_info_dft[tmp].caps;
2172 ep->dev = dev;
2173 ep->num = tmp;
2174
2175 if (tmp > 0 && tmp <= 4) {
2176 ep->fifo_size = 1024;
2177 ep->dma = &dev->dma[tmp - 1];
2178 } else
2179 ep->fifo_size = 64;
2180 ep->regs = &dev->epregs[tmp];
2181 ep->cfg = &dev->epregs[tmp];
2182 ep_reset_228x(dev->regs, ep);
2183 }
2184 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2185 usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2186 usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2187
2188 dev->gadget.ep0 = &dev->ep[0].ep;
2189 dev->ep[0].stopped = 0;
2190 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2191
2192 /* we want to prevent lowlevel/insecure access from the USB host,
2193 * but erratum 0119 means this enable bit is ignored
2194 */
2195 for (tmp = 0; tmp < 5; tmp++)
2196 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2197 }
2198
2199 static void usb_reinit_338x(struct net2280 *dev)
2200 {
2201 int i;
2202 u32 tmp, val;
2203 static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2204 static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2205 0x00, 0xC0, 0x00, 0xC0 };
2206
2207 /* basic endpoint init */
2208 for (i = 0; i < dev->n_ep; i++) {
2209 struct net2280_ep *ep = &dev->ep[i];
2210
2211 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2212 ep_info_dft[i].name;
2213 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2214 ep_info_dft[i].caps;
2215 ep->dev = dev;
2216 ep->num = i;
2217
2218 if (i > 0 && i <= 4)
2219 ep->dma = &dev->dma[i - 1];
2220
2221 if (dev->enhanced_mode) {
2222 ep->cfg = &dev->epregs[ne[i]];
2223 /*
2224 * Set USB endpoint number, hardware allows same number
2225 * in both directions.
2226 */
2227 if (i > 0 && i < 5)
2228 writel(ne[i], &ep->cfg->ep_cfg);
2229 ep->regs = (struct net2280_ep_regs __iomem *)
2230 (((void __iomem *)&dev->epregs[ne[i]]) +
2231 ep_reg_addr[i]);
2232 } else {
2233 ep->cfg = &dev->epregs[i];
2234 ep->regs = &dev->epregs[i];
2235 }
2236
2237 ep->fifo_size = (i != 0) ? 2048 : 512;
2238
2239 ep_reset_338x(dev->regs, ep);
2240 }
2241 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2242
2243 dev->gadget.ep0 = &dev->ep[0].ep;
2244 dev->ep[0].stopped = 0;
2245
2246 /* Link layer set up */
2247 if (dev->bug7734_patched) {
2248 tmp = readl(&dev->usb_ext->usbctl2) &
2249 ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2250 writel(tmp, &dev->usb_ext->usbctl2);
2251 }
2252
2253 /* Hardware Defect and Workaround */
2254 val = readl(&dev->ll_lfps_regs->ll_lfps_5);
2255 val &= ~(0xf << TIMER_LFPS_6US);
2256 val |= 0x5 << TIMER_LFPS_6US;
2257 writel(val, &dev->ll_lfps_regs->ll_lfps_5);
2258
2259 val = readl(&dev->ll_lfps_regs->ll_lfps_6);
2260 val &= ~(0xffff << TIMER_LFPS_80US);
2261 val |= 0x0100 << TIMER_LFPS_80US;
2262 writel(val, &dev->ll_lfps_regs->ll_lfps_6);
2263
2264 /*
2265 * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2266 * Hot Reset Exit Handshake may Fail in Specific Case using
2267 * Default Register Settings. Workaround for Enumeration test.
2268 */
2269 val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
2270 val &= ~(0x1f << HOT_TX_NORESET_TS2);
2271 val |= 0x10 << HOT_TX_NORESET_TS2;
2272 writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
2273
2274 val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
2275 val &= ~(0x1f << HOT_RX_RESET_TS2);
2276 val |= 0x3 << HOT_RX_RESET_TS2;
2277 writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
2278
2279 /*
2280 * Set Recovery Idle to Recover bit:
2281 * - On SS connections, setting Recovery Idle to Recover Fmw improves
2282 * link robustness with various hosts and hubs.
2283 * - It is safe to set for all connection speeds; all chip revisions.
2284 * - R-M-W to leave other bits undisturbed.
2285 * - Reference PLX TT-7372
2286 */
2287 val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
2288 val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2289 writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
2290
2291 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2292
2293 /* disable dedicated endpoints */
2294 writel(0x0D, &dev->dep[0].dep_cfg);
2295 writel(0x0D, &dev->dep[1].dep_cfg);
2296 writel(0x0E, &dev->dep[2].dep_cfg);
2297 writel(0x0E, &dev->dep[3].dep_cfg);
2298 writel(0x0F, &dev->dep[4].dep_cfg);
2299 writel(0x0C, &dev->dep[5].dep_cfg);
2300 }
2301
2302 static void usb_reinit(struct net2280 *dev)
2303 {
2304 if (dev->quirks & PLX_LEGACY)
2305 return usb_reinit_228x(dev);
2306 return usb_reinit_338x(dev);
2307 }
2308
2309 static void ep0_start_228x(struct net2280 *dev)
2310 {
2311 writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2312 BIT(CLEAR_NAK_OUT_PACKETS) |
2313 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2314 &dev->epregs[0].ep_rsp);
2315
2316 /*
2317 * hardware optionally handles a bunch of standard requests
2318 * that the API hides from drivers anyway. have it do so.
2319 * endpoint status/features are handled in software, to
2320 * help pass tests for some dubious behavior.
2321 */
2322 writel(BIT(SET_TEST_MODE) |
2323 BIT(SET_ADDRESS) |
2324 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2325 BIT(GET_DEVICE_STATUS) |
2326 BIT(GET_INTERFACE_STATUS),
2327 &dev->usb->stdrsp);
2328 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2329 BIT(SELF_POWERED_USB_DEVICE) |
2330 BIT(REMOTE_WAKEUP_SUPPORT) |
2331 (dev->softconnect << USB_DETECT_ENABLE) |
2332 BIT(SELF_POWERED_STATUS),
2333 &dev->usb->usbctl);
2334
2335 /* enable irqs so we can see ep0 and general operation */
2336 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2337 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2338 &dev->regs->pciirqenb0);
2339 writel(BIT(PCI_INTERRUPT_ENABLE) |
2340 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2341 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2342 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2343 BIT(VBUS_INTERRUPT_ENABLE) |
2344 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2345 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2346 &dev->regs->pciirqenb1);
2347
2348 /* don't leave any writes posted */
2349 (void) readl(&dev->usb->usbctl);
2350 }
2351
2352 static void ep0_start_338x(struct net2280 *dev)
2353 {
2354
2355 if (dev->bug7734_patched)
2356 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2357 BIT(SET_EP_HIDE_STATUS_PHASE),
2358 &dev->epregs[0].ep_rsp);
2359
2360 /*
2361 * hardware optionally handles a bunch of standard requests
2362 * that the API hides from drivers anyway. have it do so.
2363 * endpoint status/features are handled in software, to
2364 * help pass tests for some dubious behavior.
2365 */
2366 writel(BIT(SET_ISOCHRONOUS_DELAY) |
2367 BIT(SET_SEL) |
2368 BIT(SET_TEST_MODE) |
2369 BIT(SET_ADDRESS) |
2370 BIT(GET_INTERFACE_STATUS) |
2371 BIT(GET_DEVICE_STATUS),
2372 &dev->usb->stdrsp);
2373 dev->wakeup_enable = 1;
2374 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2375 (dev->softconnect << USB_DETECT_ENABLE) |
2376 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2377 &dev->usb->usbctl);
2378
2379 /* enable irqs so we can see ep0 and general operation */
2380 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2381 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2382 &dev->regs->pciirqenb0);
2383 writel(BIT(PCI_INTERRUPT_ENABLE) |
2384 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2385 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2386 BIT(VBUS_INTERRUPT_ENABLE),
2387 &dev->regs->pciirqenb1);
2388
2389 /* don't leave any writes posted */
2390 (void)readl(&dev->usb->usbctl);
2391 }
2392
2393 static void ep0_start(struct net2280 *dev)
2394 {
2395 if (dev->quirks & PLX_LEGACY)
2396 return ep0_start_228x(dev);
2397 return ep0_start_338x(dev);
2398 }
2399
2400 /* when a driver is successfully registered, it will receive
2401 * control requests including set_configuration(), which enables
2402 * non-control requests. then usb traffic follows until a
2403 * disconnect is reported. then a host may connect again, or
2404 * the driver might get unbound.
2405 */
2406 static int net2280_start(struct usb_gadget *_gadget,
2407 struct usb_gadget_driver *driver)
2408 {
2409 struct net2280 *dev;
2410 int retval;
2411 unsigned i;
2412
2413 /* insist on high speed support from the driver, since
2414 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2415 * "must not be used in normal operation"
2416 */
2417 if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2418 !driver->setup)
2419 return -EINVAL;
2420
2421 dev = container_of(_gadget, struct net2280, gadget);
2422
2423 for (i = 0; i < dev->n_ep; i++)
2424 dev->ep[i].irqs = 0;
2425
2426 /* hook up the driver ... */
2427 driver->driver.bus = NULL;
2428 dev->driver = driver;
2429
2430 retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2431 if (retval)
2432 goto err_unbind;
2433 retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2434 if (retval)
2435 goto err_func;
2436
2437 /* enable host detection and ep0; and we're ready
2438 * for set_configuration as well as eventual disconnect.
2439 */
2440 net2280_led_active(dev, 1);
2441
2442 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2443 defect7374_enable_data_eps_zero(dev);
2444
2445 ep0_start(dev);
2446
2447 /* pci writes may still be posted */
2448 return 0;
2449
2450 err_func:
2451 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2452 err_unbind:
2453 dev->driver = NULL;
2454 return retval;
2455 }
2456
2457 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2458 {
2459 int i;
2460
2461 /* don't disconnect if it's not connected */
2462 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2463 driver = NULL;
2464
2465 /* stop hardware; prevent new request submissions;
2466 * and kill any outstanding requests.
2467 */
2468 usb_reset(dev);
2469 for (i = 0; i < dev->n_ep; i++)
2470 nuke(&dev->ep[i]);
2471
2472 /* report disconnect; the driver is already quiesced */
2473 if (driver)
2474 driver->disconnect(&dev->gadget);
2475
2476 usb_reinit(dev);
2477 }
2478
2479 static int net2280_stop(struct usb_gadget *_gadget)
2480 {
2481 struct net2280 *dev;
2482 unsigned long flags;
2483
2484 dev = container_of(_gadget, struct net2280, gadget);
2485
2486 spin_lock_irqsave(&dev->lock, flags);
2487 stop_activity(dev, NULL);
2488 spin_unlock_irqrestore(&dev->lock, flags);
2489
2490 net2280_led_active(dev, 0);
2491
2492 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2493 device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2494
2495 dev->driver = NULL;
2496
2497 return 0;
2498 }
2499
2500 /*-------------------------------------------------------------------------*/
2501
2502 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2503 * also works for dma-capable endpoints, in pio mode or just
2504 * to manually advance the queue after short OUT transfers.
2505 */
2506 static void handle_ep_small(struct net2280_ep *ep)
2507 {
2508 struct net2280_request *req;
2509 u32 t;
2510 /* 0 error, 1 mid-data, 2 done */
2511 int mode = 1;
2512
2513 if (!list_empty(&ep->queue))
2514 req = list_entry(ep->queue.next,
2515 struct net2280_request, queue);
2516 else
2517 req = NULL;
2518
2519 /* ack all, and handle what we care about */
2520 t = readl(&ep->regs->ep_stat);
2521 ep->irqs++;
2522
2523 ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2524 ep->ep.name, t, req ? &req->req : NULL);
2525
2526 if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2527 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2528 else
2529 /* Added for 2282 */
2530 writel(t, &ep->regs->ep_stat);
2531
2532 /* for ep0, monitor token irqs to catch data stage length errors
2533 * and to synchronize on status.
2534 *
2535 * also, to defer reporting of protocol stalls ... here's where
2536 * data or status first appears, handling stalls here should never
2537 * cause trouble on the host side..
2538 *
2539 * control requests could be slightly faster without token synch for
2540 * status, but status can jam up that way.
2541 */
2542 if (unlikely(ep->num == 0)) {
2543 if (ep->is_in) {
2544 /* status; stop NAKing */
2545 if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2546 if (ep->dev->protocol_stall) {
2547 ep->stopped = 1;
2548 set_halt(ep);
2549 }
2550 if (!req)
2551 allow_status(ep);
2552 mode = 2;
2553 /* reply to extra IN data tokens with a zlp */
2554 } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2555 if (ep->dev->protocol_stall) {
2556 ep->stopped = 1;
2557 set_halt(ep);
2558 mode = 2;
2559 } else if (ep->responded &&
2560 !req && !ep->stopped)
2561 write_fifo(ep, NULL);
2562 }
2563 } else {
2564 /* status; stop NAKing */
2565 if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2566 if (ep->dev->protocol_stall) {
2567 ep->stopped = 1;
2568 set_halt(ep);
2569 }
2570 mode = 2;
2571 /* an extra OUT token is an error */
2572 } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2573 req &&
2574 req->req.actual == req->req.length) ||
2575 (ep->responded && !req)) {
2576 ep->dev->protocol_stall = 1;
2577 set_halt(ep);
2578 ep->stopped = 1;
2579 if (req)
2580 done(ep, req, -EOVERFLOW);
2581 req = NULL;
2582 }
2583 }
2584 }
2585
2586 if (unlikely(!req))
2587 return;
2588
2589 /* manual DMA queue advance after short OUT */
2590 if (likely(ep->dma)) {
2591 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2592 struct net2280_request *stuck_req = NULL;
2593 int stopped = ep->stopped;
2594 int num_completed;
2595 int stuck = 0;
2596 u32 count;
2597
2598 /* TRANSFERRED works around OUT_DONE erratum 0112.
2599 * we expect (N <= maxpacket) bytes; host wrote M.
2600 * iff (M < N) we won't ever see a DMA interrupt.
2601 */
2602 ep->stopped = 1;
2603 for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2604
2605 /* any preceding dma transfers must finish.
2606 * dma handles (M >= N), may empty the queue
2607 */
2608 num_completed = scan_dma_completions(ep);
2609 if (unlikely(list_empty(&ep->queue) ||
2610 ep->out_overflow)) {
2611 req = NULL;
2612 break;
2613 }
2614 req = list_entry(ep->queue.next,
2615 struct net2280_request, queue);
2616
2617 /* here either (M < N), a "real" short rx;
2618 * or (M == N) and the queue didn't empty
2619 */
2620 if (likely(t & BIT(FIFO_EMPTY))) {
2621 count = readl(&ep->dma->dmacount);
2622 count &= DMA_BYTE_COUNT_MASK;
2623 if (readl(&ep->dma->dmadesc)
2624 != req->td_dma)
2625 req = NULL;
2626 break;
2627 }
2628
2629 /* Escape loop if no dma transfers completed
2630 * after few retries.
2631 */
2632 if (num_completed == 0) {
2633 if (stuck_req == req &&
2634 readl(&ep->dma->dmadesc) !=
2635 req->td_dma && stuck++ > 5) {
2636 count = readl(
2637 &ep->dma->dmacount);
2638 count &= DMA_BYTE_COUNT_MASK;
2639 req = NULL;
2640 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2641 ep->ep.name, stuck,
2642 count);
2643 break;
2644 } else if (stuck_req != req) {
2645 stuck_req = req;
2646 stuck = 0;
2647 }
2648 } else {
2649 stuck_req = NULL;
2650 stuck = 0;
2651 }
2652
2653 udelay(1);
2654 }
2655
2656 /* stop DMA, leave ep NAKing */
2657 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2658 spin_stop_dma(ep->dma);
2659
2660 if (likely(req)) {
2661 req->td->dmacount = 0;
2662 t = readl(&ep->regs->ep_avail);
2663 dma_done(ep, req, count,
2664 (ep->out_overflow || t)
2665 ? -EOVERFLOW : 0);
2666 }
2667
2668 /* also flush to prevent erratum 0106 trouble */
2669 if (unlikely(ep->out_overflow ||
2670 (ep->dev->chiprev == 0x0100 &&
2671 ep->dev->gadget.speed
2672 == USB_SPEED_FULL))) {
2673 out_flush(ep);
2674 ep->out_overflow = 0;
2675 }
2676
2677 /* (re)start dma if needed, stop NAKing */
2678 ep->stopped = stopped;
2679 if (!list_empty(&ep->queue))
2680 restart_dma(ep);
2681 } else
2682 ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2683 ep->ep.name, t);
2684 return;
2685
2686 /* data packet(s) received (in the fifo, OUT) */
2687 } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2688 if (read_fifo(ep, req) && ep->num != 0)
2689 mode = 2;
2690
2691 /* data packet(s) transmitted (IN) */
2692 } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2693 unsigned len;
2694
2695 len = req->req.length - req->req.actual;
2696 if (len > ep->ep.maxpacket)
2697 len = ep->ep.maxpacket;
2698 req->req.actual += len;
2699
2700 /* if we wrote it all, we're usually done */
2701 /* send zlps until the status stage */
2702 if ((req->req.actual == req->req.length) &&
2703 (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2704 mode = 2;
2705
2706 /* there was nothing to do ... */
2707 } else if (mode == 1)
2708 return;
2709
2710 /* done */
2711 if (mode == 2) {
2712 /* stream endpoints often resubmit/unlink in completion */
2713 done(ep, req, 0);
2714
2715 /* maybe advance queue to next request */
2716 if (ep->num == 0) {
2717 /* NOTE: net2280 could let gadget driver start the
2718 * status stage later. since not all controllers let
2719 * them control that, the api doesn't (yet) allow it.
2720 */
2721 if (!ep->stopped)
2722 allow_status(ep);
2723 req = NULL;
2724 } else {
2725 if (!list_empty(&ep->queue) && !ep->stopped)
2726 req = list_entry(ep->queue.next,
2727 struct net2280_request, queue);
2728 else
2729 req = NULL;
2730 if (req && !ep->is_in)
2731 stop_out_naking(ep);
2732 }
2733 }
2734
2735 /* is there a buffer for the next packet?
2736 * for best streaming performance, make sure there is one.
2737 */
2738 if (req && !ep->stopped) {
2739
2740 /* load IN fifo with next packet (may be zlp) */
2741 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2742 write_fifo(ep, &req->req);
2743 }
2744 }
2745
2746 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2747 {
2748 struct net2280_ep *ep;
2749
2750 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2751 return &dev->ep[0];
2752 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2753 u8 bEndpointAddress;
2754
2755 if (!ep->desc)
2756 continue;
2757 bEndpointAddress = ep->desc->bEndpointAddress;
2758 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2759 continue;
2760 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2761 return ep;
2762 }
2763 return NULL;
2764 }
2765
2766 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2767 {
2768 u32 scratch, fsmvalue;
2769 u32 ack_wait_timeout, state;
2770
2771 /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2772 scratch = get_idx_reg(dev->regs, SCRATCH);
2773 fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2774 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2775
2776 if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2777 (r.bRequestType & USB_DIR_IN)))
2778 return;
2779
2780 /* This is the first Control Read for this connection: */
2781 if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2782 /*
2783 * Connection is NOT SS:
2784 * - Connection must be FS or HS.
2785 * - This FSM state should allow workaround software to
2786 * run after the next USB connection.
2787 */
2788 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2789 dev->bug7734_patched = 1;
2790 goto restore_data_eps;
2791 }
2792
2793 /* Connection is SS: */
2794 for (ack_wait_timeout = 0;
2795 ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2796 ack_wait_timeout++) {
2797
2798 state = readl(&dev->plregs->pl_ep_status_1)
2799 & (0xff << STATE);
2800 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2801 (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2802 scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2803 dev->bug7734_patched = 1;
2804 break;
2805 }
2806
2807 /*
2808 * We have not yet received host's Data Phase ACK
2809 * - Wait and try again.
2810 */
2811 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2812
2813 continue;
2814 }
2815
2816
2817 if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2818 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2819 "to detect SS host's data phase ACK.");
2820 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2821 "got 0x%2.2x.\n", state >> STATE);
2822 } else {
2823 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2824 "%duSec for Control Read Data Phase ACK\n",
2825 DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2826 }
2827
2828 restore_data_eps:
2829 /*
2830 * Restore data EPs to their pre-workaround settings (disabled,
2831 * initialized, and other details).
2832 */
2833 defect7374_disable_data_eps(dev);
2834
2835 set_idx_reg(dev->regs, SCRATCH, scratch);
2836
2837 return;
2838 }
2839
2840 static void ep_clear_seqnum(struct net2280_ep *ep)
2841 {
2842 struct net2280 *dev = ep->dev;
2843 u32 val;
2844 static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2845
2846 val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2847 val |= ep_pl[ep->num];
2848 writel(val, &dev->plregs->pl_ep_ctrl);
2849 val |= BIT(SEQUENCE_NUMBER_RESET);
2850 writel(val, &dev->plregs->pl_ep_ctrl);
2851
2852 return;
2853 }
2854
2855 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2856 struct net2280_ep *ep, struct usb_ctrlrequest r)
2857 {
2858 int tmp = 0;
2859
2860 #define w_value le16_to_cpu(r.wValue)
2861 #define w_index le16_to_cpu(r.wIndex)
2862 #define w_length le16_to_cpu(r.wLength)
2863
2864 switch (r.bRequest) {
2865 struct net2280_ep *e;
2866 u16 status;
2867
2868 case USB_REQ_SET_CONFIGURATION:
2869 dev->addressed_state = !w_value;
2870 goto usb3_delegate;
2871
2872 case USB_REQ_GET_STATUS:
2873 switch (r.bRequestType) {
2874 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2875 status = dev->wakeup_enable ? 0x02 : 0x00;
2876 if (dev->gadget.is_selfpowered)
2877 status |= BIT(0);
2878 status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2879 dev->ltm_enable << 4);
2880 writel(0, &dev->epregs[0].ep_irqenb);
2881 set_fifo_bytecount(ep, sizeof(status));
2882 writel((__force u32) status, &dev->epregs[0].ep_data);
2883 allow_status_338x(ep);
2884 break;
2885
2886 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2887 e = get_ep_by_addr(dev, w_index);
2888 if (!e)
2889 goto do_stall3;
2890 status = readl(&e->regs->ep_rsp) &
2891 BIT(CLEAR_ENDPOINT_HALT);
2892 writel(0, &dev->epregs[0].ep_irqenb);
2893 set_fifo_bytecount(ep, sizeof(status));
2894 writel((__force u32) status, &dev->epregs[0].ep_data);
2895 allow_status_338x(ep);
2896 break;
2897
2898 default:
2899 goto usb3_delegate;
2900 }
2901 break;
2902
2903 case USB_REQ_CLEAR_FEATURE:
2904 switch (r.bRequestType) {
2905 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2906 if (!dev->addressed_state) {
2907 switch (w_value) {
2908 case USB_DEVICE_U1_ENABLE:
2909 dev->u1_enable = 0;
2910 writel(readl(&dev->usb_ext->usbctl2) &
2911 ~BIT(U1_ENABLE),
2912 &dev->usb_ext->usbctl2);
2913 allow_status_338x(ep);
2914 goto next_endpoints3;
2915
2916 case USB_DEVICE_U2_ENABLE:
2917 dev->u2_enable = 0;
2918 writel(readl(&dev->usb_ext->usbctl2) &
2919 ~BIT(U2_ENABLE),
2920 &dev->usb_ext->usbctl2);
2921 allow_status_338x(ep);
2922 goto next_endpoints3;
2923
2924 case USB_DEVICE_LTM_ENABLE:
2925 dev->ltm_enable = 0;
2926 writel(readl(&dev->usb_ext->usbctl2) &
2927 ~BIT(LTM_ENABLE),
2928 &dev->usb_ext->usbctl2);
2929 allow_status_338x(ep);
2930 goto next_endpoints3;
2931
2932 default:
2933 break;
2934 }
2935 }
2936 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2937 dev->wakeup_enable = 0;
2938 writel(readl(&dev->usb->usbctl) &
2939 ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2940 &dev->usb->usbctl);
2941 allow_status_338x(ep);
2942 break;
2943 }
2944 goto usb3_delegate;
2945
2946 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2947 e = get_ep_by_addr(dev, w_index);
2948 if (!e)
2949 goto do_stall3;
2950 if (w_value != USB_ENDPOINT_HALT)
2951 goto do_stall3;
2952 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2953 /*
2954 * Workaround for SS SeqNum not cleared via
2955 * Endpoint Halt (Clear) bit. select endpoint
2956 */
2957 ep_clear_seqnum(e);
2958 clear_halt(e);
2959 if (!list_empty(&e->queue) && e->td_dma)
2960 restart_dma(e);
2961 allow_status(ep);
2962 ep->stopped = 1;
2963 break;
2964
2965 default:
2966 goto usb3_delegate;
2967 }
2968 break;
2969 case USB_REQ_SET_FEATURE:
2970 switch (r.bRequestType) {
2971 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2972 if (!dev->addressed_state) {
2973 switch (w_value) {
2974 case USB_DEVICE_U1_ENABLE:
2975 dev->u1_enable = 1;
2976 writel(readl(&dev->usb_ext->usbctl2) |
2977 BIT(U1_ENABLE),
2978 &dev->usb_ext->usbctl2);
2979 allow_status_338x(ep);
2980 goto next_endpoints3;
2981
2982 case USB_DEVICE_U2_ENABLE:
2983 dev->u2_enable = 1;
2984 writel(readl(&dev->usb_ext->usbctl2) |
2985 BIT(U2_ENABLE),
2986 &dev->usb_ext->usbctl2);
2987 allow_status_338x(ep);
2988 goto next_endpoints3;
2989
2990 case USB_DEVICE_LTM_ENABLE:
2991 dev->ltm_enable = 1;
2992 writel(readl(&dev->usb_ext->usbctl2) |
2993 BIT(LTM_ENABLE),
2994 &dev->usb_ext->usbctl2);
2995 allow_status_338x(ep);
2996 goto next_endpoints3;
2997 default:
2998 break;
2999 }
3000 }
3001
3002 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
3003 dev->wakeup_enable = 1;
3004 writel(readl(&dev->usb->usbctl) |
3005 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
3006 &dev->usb->usbctl);
3007 allow_status_338x(ep);
3008 break;
3009 }
3010 goto usb3_delegate;
3011
3012 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
3013 e = get_ep_by_addr(dev, w_index);
3014 if (!e || (w_value != USB_ENDPOINT_HALT))
3015 goto do_stall3;
3016 ep->stopped = 1;
3017 if (ep->num == 0)
3018 ep->dev->protocol_stall = 1;
3019 else {
3020 if (ep->dma)
3021 abort_dma(ep);
3022 set_halt(ep);
3023 }
3024 allow_status_338x(ep);
3025 break;
3026
3027 default:
3028 goto usb3_delegate;
3029 }
3030
3031 break;
3032 default:
3033
3034 usb3_delegate:
3035 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
3036 r.bRequestType, r.bRequest,
3037 w_value, w_index, w_length,
3038 readl(&ep->cfg->ep_cfg));
3039
3040 ep->responded = 0;
3041 spin_unlock(&dev->lock);
3042 tmp = dev->driver->setup(&dev->gadget, &r);
3043 spin_lock(&dev->lock);
3044 }
3045 do_stall3:
3046 if (tmp < 0) {
3047 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3048 r.bRequestType, r.bRequest, tmp);
3049 dev->protocol_stall = 1;
3050 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
3051 set_halt(ep);
3052 }
3053
3054 next_endpoints3:
3055
3056 #undef w_value
3057 #undef w_index
3058 #undef w_length
3059
3060 return;
3061 }
3062
3063 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
3064 {
3065 u32 index;
3066 u32 bit;
3067
3068 for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
3069 bit = BIT(ep_bit[index]);
3070
3071 if (!stat0)
3072 break;
3073
3074 if (!(stat0 & bit))
3075 continue;
3076
3077 stat0 &= ~bit;
3078
3079 handle_ep_small(&dev->ep[index]);
3080 }
3081 }
3082
3083 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3084 {
3085 struct net2280_ep *ep;
3086 u32 num, scratch;
3087
3088 /* most of these don't need individual acks */
3089 stat &= ~BIT(INTA_ASSERTED);
3090 if (!stat)
3091 return;
3092 /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3093
3094 /* starting a control request? */
3095 if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3096 union {
3097 u32 raw[2];
3098 struct usb_ctrlrequest r;
3099 } u;
3100 int tmp;
3101 struct net2280_request *req;
3102
3103 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3104 u32 val = readl(&dev->usb->usbstat);
3105 if (val & BIT(SUPER_SPEED)) {
3106 dev->gadget.speed = USB_SPEED_SUPER;
3107 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3108 EP0_SS_MAX_PACKET_SIZE);
3109 } else if (val & BIT(HIGH_SPEED)) {
3110 dev->gadget.speed = USB_SPEED_HIGH;
3111 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3112 EP0_HS_MAX_PACKET_SIZE);
3113 } else {
3114 dev->gadget.speed = USB_SPEED_FULL;
3115 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3116 EP0_HS_MAX_PACKET_SIZE);
3117 }
3118 net2280_led_speed(dev, dev->gadget.speed);
3119 ep_dbg(dev, "%s\n",
3120 usb_speed_string(dev->gadget.speed));
3121 }
3122
3123 ep = &dev->ep[0];
3124 ep->irqs++;
3125
3126 /* make sure any leftover request state is cleared */
3127 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3128 while (!list_empty(&ep->queue)) {
3129 req = list_entry(ep->queue.next,
3130 struct net2280_request, queue);
3131 done(ep, req, (req->req.actual == req->req.length)
3132 ? 0 : -EPROTO);
3133 }
3134 ep->stopped = 0;
3135 dev->protocol_stall = 0;
3136 if (!(dev->quirks & PLX_PCIE)) {
3137 if (ep->dev->quirks & PLX_2280)
3138 tmp = BIT(FIFO_OVERFLOW) |
3139 BIT(FIFO_UNDERFLOW);
3140 else
3141 tmp = 0;
3142
3143 writel(tmp | BIT(TIMEOUT) |
3144 BIT(USB_STALL_SENT) |
3145 BIT(USB_IN_NAK_SENT) |
3146 BIT(USB_IN_ACK_RCVD) |
3147 BIT(USB_OUT_PING_NAK_SENT) |
3148 BIT(USB_OUT_ACK_SENT) |
3149 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3150 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3151 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3152 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3153 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3154 BIT(DATA_IN_TOKEN_INTERRUPT),
3155 &ep->regs->ep_stat);
3156 }
3157 u.raw[0] = readl(&dev->usb->setup0123);
3158 u.raw[1] = readl(&dev->usb->setup4567);
3159
3160 cpu_to_le32s(&u.raw[0]);
3161 cpu_to_le32s(&u.raw[1]);
3162
3163 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
3164 defect7374_workaround(dev, u.r);
3165
3166 tmp = 0;
3167
3168 #define w_value le16_to_cpu(u.r.wValue)
3169 #define w_index le16_to_cpu(u.r.wIndex)
3170 #define w_length le16_to_cpu(u.r.wLength)
3171
3172 /* ack the irq */
3173 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3174 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3175
3176 /* watch control traffic at the token level, and force
3177 * synchronization before letting the status stage happen.
3178 * FIXME ignore tokens we'll NAK, until driver responds.
3179 * that'll mean a lot less irqs for some drivers.
3180 */
3181 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3182 if (ep->is_in) {
3183 scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3184 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3185 BIT(DATA_IN_TOKEN_INTERRUPT);
3186 stop_out_naking(ep);
3187 } else
3188 scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3189 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3190 BIT(DATA_IN_TOKEN_INTERRUPT);
3191 writel(scratch, &dev->epregs[0].ep_irqenb);
3192
3193 /* we made the hardware handle most lowlevel requests;
3194 * everything else goes uplevel to the gadget code.
3195 */
3196 ep->responded = 1;
3197
3198 if (dev->gadget.speed == USB_SPEED_SUPER) {
3199 handle_stat0_irqs_superspeed(dev, ep, u.r);
3200 goto next_endpoints;
3201 }
3202
3203 switch (u.r.bRequest) {
3204 case USB_REQ_GET_STATUS: {
3205 struct net2280_ep *e;
3206 __le32 status;
3207
3208 /* hw handles device and interface status */
3209 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3210 goto delegate;
3211 e = get_ep_by_addr(dev, w_index);
3212 if (!e || w_length > 2)
3213 goto do_stall;
3214
3215 if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3216 status = cpu_to_le32(1);
3217 else
3218 status = cpu_to_le32(0);
3219
3220 /* don't bother with a request object! */
3221 writel(0, &dev->epregs[0].ep_irqenb);
3222 set_fifo_bytecount(ep, w_length);
3223 writel((__force u32)status, &dev->epregs[0].ep_data);
3224 allow_status(ep);
3225 ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3226 goto next_endpoints;
3227 }
3228 break;
3229 case USB_REQ_CLEAR_FEATURE: {
3230 struct net2280_ep *e;
3231
3232 /* hw handles device features */
3233 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3234 goto delegate;
3235 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3236 goto do_stall;
3237 e = get_ep_by_addr(dev, w_index);
3238 if (!e)
3239 goto do_stall;
3240 if (e->wedged) {
3241 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3242 ep->ep.name);
3243 } else {
3244 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3245 clear_halt(e);
3246 if ((ep->dev->quirks & PLX_PCIE) &&
3247 !list_empty(&e->queue) && e->td_dma)
3248 restart_dma(e);
3249 }
3250 allow_status(ep);
3251 goto next_endpoints;
3252 }
3253 break;
3254 case USB_REQ_SET_FEATURE: {
3255 struct net2280_ep *e;
3256
3257 /* hw handles device features */
3258 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3259 goto delegate;
3260 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3261 goto do_stall;
3262 e = get_ep_by_addr(dev, w_index);
3263 if (!e)
3264 goto do_stall;
3265 if (e->ep.name == ep0name)
3266 goto do_stall;
3267 set_halt(e);
3268 if ((dev->quirks & PLX_PCIE) && e->dma)
3269 abort_dma(e);
3270 allow_status(ep);
3271 ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3272 goto next_endpoints;
3273 }
3274 break;
3275 default:
3276 delegate:
3277 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3278 "ep_cfg %08x\n",
3279 u.r.bRequestType, u.r.bRequest,
3280 w_value, w_index, w_length,
3281 readl(&ep->cfg->ep_cfg));
3282 ep->responded = 0;
3283 spin_unlock(&dev->lock);
3284 tmp = dev->driver->setup(&dev->gadget, &u.r);
3285 spin_lock(&dev->lock);
3286 }
3287
3288 /* stall ep0 on error */
3289 if (tmp < 0) {
3290 do_stall:
3291 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3292 u.r.bRequestType, u.r.bRequest, tmp);
3293 dev->protocol_stall = 1;
3294 }
3295
3296 /* some in/out token irq should follow; maybe stall then.
3297 * driver must queue a request (even zlp) or halt ep0
3298 * before the host times out.
3299 */
3300 }
3301
3302 #undef w_value
3303 #undef w_index
3304 #undef w_length
3305
3306 next_endpoints:
3307 if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
3308 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3309 USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3310 USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3311
3312 if (stat & mask) {
3313 usb338x_handle_ep_intr(dev, stat & mask);
3314 stat &= ~mask;
3315 }
3316 } else {
3317 /* endpoint data irq ? */
3318 scratch = stat & 0x7f;
3319 stat &= ~0x7f;
3320 for (num = 0; scratch; num++) {
3321 u32 t;
3322
3323 /* do this endpoint's FIFO and queue need tending? */
3324 t = BIT(num);
3325 if ((scratch & t) == 0)
3326 continue;
3327 scratch ^= t;
3328
3329 ep = &dev->ep[num];
3330 handle_ep_small(ep);
3331 }
3332 }
3333
3334 if (stat)
3335 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3336 }
3337
3338 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3339 BIT(DMA_C_INTERRUPT) | \
3340 BIT(DMA_B_INTERRUPT) | \
3341 BIT(DMA_A_INTERRUPT))
3342 #define PCI_ERROR_INTERRUPTS ( \
3343 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3344 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3345 BIT(PCI_RETRY_ABORT_INTERRUPT))
3346
3347 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3348 {
3349 struct net2280_ep *ep;
3350 u32 tmp, num, mask, scratch;
3351
3352 /* after disconnect there's nothing else to do! */
3353 tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3354 mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3355
3356 /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3357 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3358 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3359 * only indicates a change in the reset state).
3360 */
3361 if (stat & tmp) {
3362 bool reset = false;
3363 bool disconnect = false;
3364
3365 /*
3366 * Ignore disconnects and resets if the speed hasn't been set.
3367 * VBUS can bounce and there's always an initial reset.
3368 */
3369 writel(tmp, &dev->regs->irqstat1);
3370 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3371 if ((stat & BIT(VBUS_INTERRUPT)) &&
3372 (readl(&dev->usb->usbctl) &
3373 BIT(VBUS_PIN)) == 0) {
3374 disconnect = true;
3375 ep_dbg(dev, "disconnect %s\n",
3376 dev->driver->driver.name);
3377 } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3378 (readl(&dev->usb->usbstat) & mask)
3379 == 0) {
3380 reset = true;
3381 ep_dbg(dev, "reset %s\n",
3382 dev->driver->driver.name);
3383 }
3384
3385 if (disconnect || reset) {
3386 stop_activity(dev, dev->driver);
3387 ep0_start(dev);
3388 if (reset)
3389 usb_gadget_udc_reset
3390 (&dev->gadget, dev->driver);
3391 else
3392 (dev->driver->disconnect)
3393 (&dev->gadget);
3394 return;
3395 }
3396 }
3397 stat &= ~tmp;
3398
3399 /* vBUS can bounce ... one of many reasons to ignore the
3400 * notion of hotplug events on bus connect/disconnect!
3401 */
3402 if (!stat)
3403 return;
3404 }
3405
3406 /* NOTE: chip stays in PCI D0 state for now, but it could
3407 * enter D1 to save more power
3408 */
3409 tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3410 if (stat & tmp) {
3411 writel(tmp, &dev->regs->irqstat1);
3412 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3413 if (dev->driver->suspend)
3414 dev->driver->suspend(&dev->gadget);
3415 if (!enable_suspend)
3416 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3417 } else {
3418 if (dev->driver->resume)
3419 dev->driver->resume(&dev->gadget);
3420 /* at high speed, note erratum 0133 */
3421 }
3422 stat &= ~tmp;
3423 }
3424
3425 /* clear any other status/irqs */
3426 if (stat)
3427 writel(stat, &dev->regs->irqstat1);
3428
3429 /* some status we can just ignore */
3430 if (dev->quirks & PLX_2280)
3431 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3432 BIT(SUSPEND_REQUEST_INTERRUPT) |
3433 BIT(RESUME_INTERRUPT) |
3434 BIT(SOF_INTERRUPT));
3435 else
3436 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3437 BIT(RESUME_INTERRUPT) |
3438 BIT(SOF_DOWN_INTERRUPT) |
3439 BIT(SOF_INTERRUPT));
3440
3441 if (!stat)
3442 return;
3443 /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3444
3445 /* DMA status, for ep-{a,b,c,d} */
3446 scratch = stat & DMA_INTERRUPTS;
3447 stat &= ~DMA_INTERRUPTS;
3448 scratch >>= 9;
3449 for (num = 0; scratch; num++) {
3450 struct net2280_dma_regs __iomem *dma;
3451
3452 tmp = BIT(num);
3453 if ((tmp & scratch) == 0)
3454 continue;
3455 scratch ^= tmp;
3456
3457 ep = &dev->ep[num + 1];
3458 dma = ep->dma;
3459
3460 if (!dma)
3461 continue;
3462
3463 /* clear ep's dma status */
3464 tmp = readl(&dma->dmastat);
3465 writel(tmp, &dma->dmastat);
3466
3467 /* dma sync*/
3468 if (dev->quirks & PLX_PCIE) {
3469 u32 r_dmacount = readl(&dma->dmacount);
3470 if (!ep->is_in && (r_dmacount & 0x00FFFFFF) &&
3471 (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3472 continue;
3473 }
3474
3475 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3476 ep_dbg(ep->dev, "%s no xact done? %08x\n",
3477 ep->ep.name, tmp);
3478 continue;
3479 }
3480 stop_dma(ep->dma);
3481
3482 /* OUT transfers terminate when the data from the
3483 * host is in our memory. Process whatever's done.
3484 * On this path, we know transfer's last packet wasn't
3485 * less than req->length. NAK_OUT_PACKETS may be set,
3486 * or the FIFO may already be holding new packets.
3487 *
3488 * IN transfers can linger in the FIFO for a very
3489 * long time ... we ignore that for now, accounting
3490 * precisely (like PIO does) needs per-packet irqs
3491 */
3492 scan_dma_completions(ep);
3493
3494 /* disable dma on inactive queues; else maybe restart */
3495 if (!list_empty(&ep->queue)) {
3496 tmp = readl(&dma->dmactl);
3497 restart_dma(ep);
3498 }
3499 ep->irqs++;
3500 }
3501
3502 /* NOTE: there are other PCI errors we might usefully notice.
3503 * if they appear very often, here's where to try recovering.
3504 */
3505 if (stat & PCI_ERROR_INTERRUPTS) {
3506 ep_err(dev, "pci dma error; stat %08x\n", stat);
3507 stat &= ~PCI_ERROR_INTERRUPTS;
3508 /* these are fatal errors, but "maybe" they won't
3509 * happen again ...
3510 */
3511 stop_activity(dev, dev->driver);
3512 ep0_start(dev);
3513 stat = 0;
3514 }
3515
3516 if (stat)
3517 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3518 }
3519
3520 static irqreturn_t net2280_irq(int irq, void *_dev)
3521 {
3522 struct net2280 *dev = _dev;
3523
3524 /* shared interrupt, not ours */
3525 if ((dev->quirks & PLX_LEGACY) &&
3526 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3527 return IRQ_NONE;
3528
3529 spin_lock(&dev->lock);
3530
3531 /* handle disconnect, dma, and more */
3532 handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3533
3534 /* control requests and PIO */
3535 handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3536
3537 if (dev->quirks & PLX_PCIE) {
3538 /* re-enable interrupt to trigger any possible new interrupt */
3539 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3540 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3541 writel(pciirqenb1, &dev->regs->pciirqenb1);
3542 }
3543
3544 spin_unlock(&dev->lock);
3545
3546 return IRQ_HANDLED;
3547 }
3548
3549 /*-------------------------------------------------------------------------*/
3550
3551 static void gadget_release(struct device *_dev)
3552 {
3553 struct net2280 *dev = dev_get_drvdata(_dev);
3554
3555 kfree(dev);
3556 }
3557
3558 /* tear down the binding between this driver and the pci device */
3559
3560 static void net2280_remove(struct pci_dev *pdev)
3561 {
3562 struct net2280 *dev = pci_get_drvdata(pdev);
3563
3564 usb_del_gadget_udc(&dev->gadget);
3565
3566 BUG_ON(dev->driver);
3567
3568 /* then clean up the resources we allocated during probe() */
3569 net2280_led_shutdown(dev);
3570 if (dev->requests) {
3571 int i;
3572 for (i = 1; i < 5; i++) {
3573 if (!dev->ep[i].dummy)
3574 continue;
3575 dma_pool_free(dev->requests, dev->ep[i].dummy,
3576 dev->ep[i].td_dma);
3577 }
3578 dma_pool_destroy(dev->requests);
3579 }
3580 if (dev->got_irq)
3581 free_irq(pdev->irq, dev);
3582 if (dev->quirks & PLX_PCIE)
3583 pci_disable_msi(pdev);
3584 if (dev->regs)
3585 iounmap(dev->regs);
3586 if (dev->region)
3587 release_mem_region(pci_resource_start(pdev, 0),
3588 pci_resource_len(pdev, 0));
3589 if (dev->enabled)
3590 pci_disable_device(pdev);
3591 device_remove_file(&pdev->dev, &dev_attr_registers);
3592
3593 ep_info(dev, "unbind\n");
3594 }
3595
3596 /* wrap this driver around the specified device, but
3597 * don't respond over USB until a gadget driver binds to us.
3598 */
3599
3600 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3601 {
3602 struct net2280 *dev;
3603 unsigned long resource, len;
3604 void __iomem *base = NULL;
3605 int retval, i;
3606
3607 /* alloc, and start init */
3608 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3609 if (dev == NULL) {
3610 retval = -ENOMEM;
3611 goto done;
3612 }
3613
3614 pci_set_drvdata(pdev, dev);
3615 spin_lock_init(&dev->lock);
3616 dev->quirks = id->driver_data;
3617 dev->pdev = pdev;
3618 dev->gadget.ops = &net2280_ops;
3619 dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3620 USB_SPEED_SUPER : USB_SPEED_HIGH;
3621
3622 /* the "gadget" abstracts/virtualizes the controller */
3623 dev->gadget.name = driver_name;
3624
3625 /* now all the pci goodies ... */
3626 if (pci_enable_device(pdev) < 0) {
3627 retval = -ENODEV;
3628 goto done;
3629 }
3630 dev->enabled = 1;
3631
3632 /* BAR 0 holds all the registers
3633 * BAR 1 is 8051 memory; unused here (note erratum 0103)
3634 * BAR 2 is fifo memory; unused here
3635 */
3636 resource = pci_resource_start(pdev, 0);
3637 len = pci_resource_len(pdev, 0);
3638 if (!request_mem_region(resource, len, driver_name)) {
3639 ep_dbg(dev, "controller already in use\n");
3640 retval = -EBUSY;
3641 goto done;
3642 }
3643 dev->region = 1;
3644
3645 /* FIXME provide firmware download interface to put
3646 * 8051 code into the chip, e.g. to turn on PCI PM.
3647 */
3648
3649 base = ioremap_nocache(resource, len);
3650 if (base == NULL) {
3651 ep_dbg(dev, "can't map memory\n");
3652 retval = -EFAULT;
3653 goto done;
3654 }
3655 dev->regs = (struct net2280_regs __iomem *) base;
3656 dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3657 dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3658 dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3659 dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3660 dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3661
3662 if (dev->quirks & PLX_PCIE) {
3663 u32 fsmvalue;
3664 u32 usbstat;
3665 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3666 (base + 0x00b4);
3667 dev->llregs = (struct usb338x_ll_regs __iomem *)
3668 (base + 0x0700);
3669 dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
3670 (base + 0x0748);
3671 dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
3672 (base + 0x077c);
3673 dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
3674 (base + 0x079c);
3675 dev->plregs = (struct usb338x_pl_regs __iomem *)
3676 (base + 0x0800);
3677 usbstat = readl(&dev->usb->usbstat);
3678 dev->enhanced_mode = !!(usbstat & BIT(11));
3679 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3680 /* put into initial config, link up all endpoints */
3681 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3682 (0xf << DEFECT7374_FSM_FIELD);
3683 /* See if firmware needs to set up for workaround: */
3684 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3685 dev->bug7734_patched = 1;
3686 writel(0, &dev->usb->usbctl);
3687 } else
3688 dev->bug7734_patched = 0;
3689 } else {
3690 dev->enhanced_mode = 0;
3691 dev->n_ep = 7;
3692 /* put into initial config, link up all endpoints */
3693 writel(0, &dev->usb->usbctl);
3694 }
3695
3696 usb_reset(dev);
3697 usb_reinit(dev);
3698
3699 /* irq setup after old hardware is cleaned up */
3700 if (!pdev->irq) {
3701 ep_err(dev, "No IRQ. Check PCI setup!\n");
3702 retval = -ENODEV;
3703 goto done;
3704 }
3705
3706 if (dev->quirks & PLX_PCIE)
3707 if (pci_enable_msi(pdev))
3708 ep_err(dev, "Failed to enable MSI mode\n");
3709
3710 if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3711 driver_name, dev)) {
3712 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3713 retval = -EBUSY;
3714 goto done;
3715 }
3716 dev->got_irq = 1;
3717
3718 /* DMA setup */
3719 /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */
3720 dev->requests = dma_pool_create("requests", &pdev->dev,
3721 sizeof(struct net2280_dma),
3722 0 /* no alignment requirements */,
3723 0 /* or page-crossing issues */);
3724 if (!dev->requests) {
3725 ep_dbg(dev, "can't get request pool\n");
3726 retval = -ENOMEM;
3727 goto done;
3728 }
3729 for (i = 1; i < 5; i++) {
3730 struct net2280_dma *td;
3731
3732 td = dma_pool_alloc(dev->requests, GFP_KERNEL,
3733 &dev->ep[i].td_dma);
3734 if (!td) {
3735 ep_dbg(dev, "can't get dummy %d\n", i);
3736 retval = -ENOMEM;
3737 goto done;
3738 }
3739 td->dmacount = 0; /* not VALID */
3740 td->dmadesc = td->dmaaddr;
3741 dev->ep[i].dummy = td;
3742 }
3743
3744 /* enable lower-overhead pci memory bursts during DMA */
3745 if (dev->quirks & PLX_LEGACY)
3746 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3747 /*
3748 * 256 write retries may not be enough...
3749 BIT(PCI_RETRY_ABORT_ENABLE) |
3750 */
3751 BIT(DMA_READ_MULTIPLE_ENABLE) |
3752 BIT(DMA_READ_LINE_ENABLE),
3753 &dev->pci->pcimstctl);
3754 /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3755 pci_set_master(pdev);
3756 pci_try_set_mwi(pdev);
3757
3758 /* ... also flushes any posted pci writes */
3759 dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3760
3761 /* done */
3762 ep_info(dev, "%s\n", driver_desc);
3763 ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3764 pdev->irq, base, dev->chiprev);
3765 ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3766 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3767 retval = device_create_file(&pdev->dev, &dev_attr_registers);
3768 if (retval)
3769 goto done;
3770
3771 retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
3772 gadget_release);
3773 if (retval)
3774 goto done;
3775 return 0;
3776
3777 done:
3778 if (dev)
3779 net2280_remove(pdev);
3780 return retval;
3781 }
3782
3783 /* make sure the board is quiescent; otherwise it will continue
3784 * generating IRQs across the upcoming reboot.
3785 */
3786
3787 static void net2280_shutdown(struct pci_dev *pdev)
3788 {
3789 struct net2280 *dev = pci_get_drvdata(pdev);
3790
3791 /* disable IRQs */
3792 writel(0, &dev->regs->pciirqenb0);
3793 writel(0, &dev->regs->pciirqenb1);
3794
3795 /* disable the pullup so the host will think we're gone */
3796 writel(0, &dev->usb->usbctl);
3797
3798 }
3799
3800
3801 /*-------------------------------------------------------------------------*/
3802
3803 static const struct pci_device_id pci_ids[] = { {
3804 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3805 .class_mask = ~0,
3806 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3807 .device = 0x2280,
3808 .subvendor = PCI_ANY_ID,
3809 .subdevice = PCI_ANY_ID,
3810 .driver_data = PLX_LEGACY | PLX_2280,
3811 }, {
3812 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3813 .class_mask = ~0,
3814 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3815 .device = 0x2282,
3816 .subvendor = PCI_ANY_ID,
3817 .subdevice = PCI_ANY_ID,
3818 .driver_data = PLX_LEGACY,
3819 },
3820 {
3821 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3822 .class_mask = ~0,
3823 .vendor = PCI_VENDOR_ID_PLX,
3824 .device = 0x2380,
3825 .subvendor = PCI_ANY_ID,
3826 .subdevice = PCI_ANY_ID,
3827 .driver_data = PLX_PCIE,
3828 },
3829 {
3830 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3831 .class_mask = ~0,
3832 .vendor = PCI_VENDOR_ID_PLX,
3833 .device = 0x3380,
3834 .subvendor = PCI_ANY_ID,
3835 .subdevice = PCI_ANY_ID,
3836 .driver_data = PLX_PCIE | PLX_SUPERSPEED,
3837 },
3838 {
3839 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3840 .class_mask = ~0,
3841 .vendor = PCI_VENDOR_ID_PLX,
3842 .device = 0x3382,
3843 .subvendor = PCI_ANY_ID,
3844 .subdevice = PCI_ANY_ID,
3845 .driver_data = PLX_PCIE | PLX_SUPERSPEED,
3846 },
3847 { /* end: all zeroes */ }
3848 };
3849 MODULE_DEVICE_TABLE(pci, pci_ids);
3850
3851 /* pci driver glue; this is a "new style" PCI driver module */
3852 static struct pci_driver net2280_pci_driver = {
3853 .name = (char *) driver_name,
3854 .id_table = pci_ids,
3855
3856 .probe = net2280_probe,
3857 .remove = net2280_remove,
3858 .shutdown = net2280_shutdown,
3859
3860 /* FIXME add power management support */
3861 };
3862
3863 module_pci_driver(net2280_pci_driver);
3864
3865 MODULE_DESCRIPTION(DRIVER_DESC);
3866 MODULE_AUTHOR("David Brownell");
3867 MODULE_LICENSE("GPL");
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