xref: /openbmc/linux/drivers/usb/gadget/udc/net2280.c (revision 9b9c2cd4)
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_SUPERSPEED) {
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) & 0x1fff;
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 & 0x7ff;
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_SUPERSPEED) && 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_SUPERSPEED)
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_SUPERSPEED)
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 = pci_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: Inavlid 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 		pci_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_SUPERSPEED)
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_SUPERSPEED) && 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 void scan_dma_completions(struct net2280_ep *ep)
1141 {
1142 	/* only look at descriptors that were "naturally" retired,
1143 	 * so fifo and list head state won't matter
1144 	 */
1145 	while (!list_empty(&ep->queue)) {
1146 		struct net2280_request	*req;
1147 		u32			tmp;
1148 
1149 		req = list_entry(ep->queue.next,
1150 				struct net2280_request, queue);
1151 		if (!req->valid)
1152 			break;
1153 		rmb();
1154 		tmp = le32_to_cpup(&req->td->dmacount);
1155 		if ((tmp & BIT(VALID_BIT)) != 0)
1156 			break;
1157 
1158 		/* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1159 		 * cases where DMA must be aborted; this code handles
1160 		 * all non-abort DMA completions.
1161 		 */
1162 		if (unlikely(req->td->dmadesc == 0)) {
1163 			/* paranoia */
1164 			tmp = readl(&ep->dma->dmacount);
1165 			if (tmp & DMA_BYTE_COUNT_MASK)
1166 				break;
1167 			/* single transfer mode */
1168 			dma_done(ep, req, tmp, 0);
1169 			break;
1170 		} else if (!ep->is_in &&
1171 			   (req->req.length % ep->ep.maxpacket) &&
1172 			   !(ep->dev->quirks & PLX_SUPERSPEED)) {
1173 
1174 			tmp = readl(&ep->regs->ep_stat);
1175 			/* AVOID TROUBLE HERE by not issuing short reads from
1176 			 * your gadget driver.  That helps avoids errata 0121,
1177 			 * 0122, and 0124; not all cases trigger the warning.
1178 			 */
1179 			if ((tmp & BIT(NAK_OUT_PACKETS)) == 0) {
1180 				ep_warn(ep->dev, "%s lost packet sync!\n",
1181 						ep->ep.name);
1182 				req->req.status = -EOVERFLOW;
1183 			} else {
1184 				tmp = readl(&ep->regs->ep_avail);
1185 				if (tmp) {
1186 					/* fifo gets flushed later */
1187 					ep->out_overflow = 1;
1188 					ep_dbg(ep->dev,
1189 						"%s dma, discard %d len %d\n",
1190 						ep->ep.name, tmp,
1191 						req->req.length);
1192 					req->req.status = -EOVERFLOW;
1193 				}
1194 			}
1195 		}
1196 		dma_done(ep, req, tmp, 0);
1197 	}
1198 }
1199 
1200 static void restart_dma(struct net2280_ep *ep)
1201 {
1202 	struct net2280_request	*req;
1203 
1204 	if (ep->stopped)
1205 		return;
1206 	req = list_entry(ep->queue.next, struct net2280_request, queue);
1207 
1208 	start_dma(ep, req);
1209 }
1210 
1211 static void abort_dma(struct net2280_ep *ep)
1212 {
1213 	/* abort the current transfer */
1214 	if (likely(!list_empty(&ep->queue))) {
1215 		/* FIXME work around errata 0121, 0122, 0124 */
1216 		writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1217 		spin_stop_dma(ep->dma);
1218 	} else
1219 		stop_dma(ep->dma);
1220 	scan_dma_completions(ep);
1221 }
1222 
1223 /* dequeue ALL requests */
1224 static void nuke(struct net2280_ep *ep)
1225 {
1226 	struct net2280_request	*req;
1227 
1228 	/* called with spinlock held */
1229 	ep->stopped = 1;
1230 	if (ep->dma)
1231 		abort_dma(ep);
1232 	while (!list_empty(&ep->queue)) {
1233 		req = list_entry(ep->queue.next,
1234 				struct net2280_request,
1235 				queue);
1236 		done(ep, req, -ESHUTDOWN);
1237 	}
1238 }
1239 
1240 /* dequeue JUST ONE request */
1241 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1242 {
1243 	struct net2280_ep	*ep;
1244 	struct net2280_request	*req;
1245 	unsigned long		flags;
1246 	u32			dmactl;
1247 	int			stopped;
1248 
1249 	ep = container_of(_ep, struct net2280_ep, ep);
1250 	if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1251 		pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1252 						__func__, _ep, _req);
1253 		return -EINVAL;
1254 	}
1255 
1256 	spin_lock_irqsave(&ep->dev->lock, flags);
1257 	stopped = ep->stopped;
1258 
1259 	/* quiesce dma while we patch the queue */
1260 	dmactl = 0;
1261 	ep->stopped = 1;
1262 	if (ep->dma) {
1263 		dmactl = readl(&ep->dma->dmactl);
1264 		/* WARNING erratum 0127 may kick in ... */
1265 		stop_dma(ep->dma);
1266 		scan_dma_completions(ep);
1267 	}
1268 
1269 	/* make sure it's still queued on this endpoint */
1270 	list_for_each_entry(req, &ep->queue, queue) {
1271 		if (&req->req == _req)
1272 			break;
1273 	}
1274 	if (&req->req != _req) {
1275 		spin_unlock_irqrestore(&ep->dev->lock, flags);
1276 		dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
1277 								__func__);
1278 		return -EINVAL;
1279 	}
1280 
1281 	/* queue head may be partially complete. */
1282 	if (ep->queue.next == &req->queue) {
1283 		if (ep->dma) {
1284 			ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1285 			_req->status = -ECONNRESET;
1286 			abort_dma(ep);
1287 			if (likely(ep->queue.next == &req->queue)) {
1288 				/* NOTE: misreports single-transfer mode*/
1289 				req->td->dmacount = 0;	/* invalidate */
1290 				dma_done(ep, req,
1291 					readl(&ep->dma->dmacount),
1292 					-ECONNRESET);
1293 			}
1294 		} else {
1295 			ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1296 			done(ep, req, -ECONNRESET);
1297 		}
1298 		req = NULL;
1299 	}
1300 
1301 	if (req)
1302 		done(ep, req, -ECONNRESET);
1303 	ep->stopped = stopped;
1304 
1305 	if (ep->dma) {
1306 		/* turn off dma on inactive queues */
1307 		if (list_empty(&ep->queue))
1308 			stop_dma(ep->dma);
1309 		else if (!ep->stopped) {
1310 			/* resume current request, or start new one */
1311 			if (req)
1312 				writel(dmactl, &ep->dma->dmactl);
1313 			else
1314 				start_dma(ep, list_entry(ep->queue.next,
1315 					struct net2280_request, queue));
1316 		}
1317 	}
1318 
1319 	spin_unlock_irqrestore(&ep->dev->lock, flags);
1320 	return 0;
1321 }
1322 
1323 /*-------------------------------------------------------------------------*/
1324 
1325 static int net2280_fifo_status(struct usb_ep *_ep);
1326 
1327 static int
1328 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1329 {
1330 	struct net2280_ep	*ep;
1331 	unsigned long		flags;
1332 	int			retval = 0;
1333 
1334 	ep = container_of(_ep, struct net2280_ep, ep);
1335 	if (!_ep || (!ep->desc && ep->num != 0)) {
1336 		pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1337 		return -EINVAL;
1338 	}
1339 	if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1340 		retval = -ESHUTDOWN;
1341 		goto print_err;
1342 	}
1343 	if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1344 						== USB_ENDPOINT_XFER_ISOC) {
1345 		retval = -EINVAL;
1346 		goto print_err;
1347 	}
1348 
1349 	spin_lock_irqsave(&ep->dev->lock, flags);
1350 	if (!list_empty(&ep->queue)) {
1351 		retval = -EAGAIN;
1352 		goto print_unlock;
1353 	} else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1354 		retval = -EAGAIN;
1355 		goto print_unlock;
1356 	} else {
1357 		ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1358 				value ? "set" : "clear",
1359 				wedged ? "wedge" : "halt");
1360 		/* set/clear, then synch memory views with the device */
1361 		if (value) {
1362 			if (ep->num == 0)
1363 				ep->dev->protocol_stall = 1;
1364 			else
1365 				set_halt(ep);
1366 			if (wedged)
1367 				ep->wedged = 1;
1368 		} else {
1369 			clear_halt(ep);
1370 			if (ep->dev->quirks & PLX_SUPERSPEED &&
1371 				!list_empty(&ep->queue) && ep->td_dma)
1372 					restart_dma(ep);
1373 			ep->wedged = 0;
1374 		}
1375 		(void) readl(&ep->regs->ep_rsp);
1376 	}
1377 	spin_unlock_irqrestore(&ep->dev->lock, flags);
1378 
1379 	return retval;
1380 
1381 print_unlock:
1382 	spin_unlock_irqrestore(&ep->dev->lock, flags);
1383 print_err:
1384 	dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1385 	return retval;
1386 }
1387 
1388 static int net2280_set_halt(struct usb_ep *_ep, int value)
1389 {
1390 	return net2280_set_halt_and_wedge(_ep, value, 0);
1391 }
1392 
1393 static int net2280_set_wedge(struct usb_ep *_ep)
1394 {
1395 	if (!_ep || _ep->name == ep0name) {
1396 		pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1397 		return -EINVAL;
1398 	}
1399 	return net2280_set_halt_and_wedge(_ep, 1, 1);
1400 }
1401 
1402 static int net2280_fifo_status(struct usb_ep *_ep)
1403 {
1404 	struct net2280_ep	*ep;
1405 	u32			avail;
1406 
1407 	ep = container_of(_ep, struct net2280_ep, ep);
1408 	if (!_ep || (!ep->desc && ep->num != 0)) {
1409 		pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1410 		return -ENODEV;
1411 	}
1412 	if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1413 		dev_err(&ep->dev->pdev->dev,
1414 			"%s: Invalid driver=%p or speed=%d\n",
1415 			__func__, ep->dev->driver, ep->dev->gadget.speed);
1416 		return -ESHUTDOWN;
1417 	}
1418 
1419 	avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1420 	if (avail > ep->fifo_size) {
1421 		dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1422 		return -EOVERFLOW;
1423 	}
1424 	if (ep->is_in)
1425 		avail = ep->fifo_size - avail;
1426 	return avail;
1427 }
1428 
1429 static void net2280_fifo_flush(struct usb_ep *_ep)
1430 {
1431 	struct net2280_ep	*ep;
1432 
1433 	ep = container_of(_ep, struct net2280_ep, ep);
1434 	if (!_ep || (!ep->desc && ep->num != 0)) {
1435 		pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1436 		return;
1437 	}
1438 	if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1439 		dev_err(&ep->dev->pdev->dev,
1440 			"%s: Invalid driver=%p or speed=%d\n",
1441 			__func__, ep->dev->driver, ep->dev->gadget.speed);
1442 		return;
1443 	}
1444 
1445 	writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1446 	(void) readl(&ep->regs->ep_rsp);
1447 }
1448 
1449 static const struct usb_ep_ops net2280_ep_ops = {
1450 	.enable		= net2280_enable,
1451 	.disable	= net2280_disable,
1452 
1453 	.alloc_request	= net2280_alloc_request,
1454 	.free_request	= net2280_free_request,
1455 
1456 	.queue		= net2280_queue,
1457 	.dequeue	= net2280_dequeue,
1458 
1459 	.set_halt	= net2280_set_halt,
1460 	.set_wedge	= net2280_set_wedge,
1461 	.fifo_status	= net2280_fifo_status,
1462 	.fifo_flush	= net2280_fifo_flush,
1463 };
1464 
1465 /*-------------------------------------------------------------------------*/
1466 
1467 static int net2280_get_frame(struct usb_gadget *_gadget)
1468 {
1469 	struct net2280		*dev;
1470 	unsigned long		flags;
1471 	u16			retval;
1472 
1473 	if (!_gadget)
1474 		return -ENODEV;
1475 	dev = container_of(_gadget, struct net2280, gadget);
1476 	spin_lock_irqsave(&dev->lock, flags);
1477 	retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1478 	spin_unlock_irqrestore(&dev->lock, flags);
1479 	return retval;
1480 }
1481 
1482 static int net2280_wakeup(struct usb_gadget *_gadget)
1483 {
1484 	struct net2280		*dev;
1485 	u32			tmp;
1486 	unsigned long		flags;
1487 
1488 	if (!_gadget)
1489 		return 0;
1490 	dev = container_of(_gadget, struct net2280, gadget);
1491 
1492 	spin_lock_irqsave(&dev->lock, flags);
1493 	tmp = readl(&dev->usb->usbctl);
1494 	if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1495 		writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1496 	spin_unlock_irqrestore(&dev->lock, flags);
1497 
1498 	/* pci writes may still be posted */
1499 	return 0;
1500 }
1501 
1502 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1503 {
1504 	struct net2280		*dev;
1505 	u32			tmp;
1506 	unsigned long		flags;
1507 
1508 	if (!_gadget)
1509 		return 0;
1510 	dev = container_of(_gadget, struct net2280, gadget);
1511 
1512 	spin_lock_irqsave(&dev->lock, flags);
1513 	tmp = readl(&dev->usb->usbctl);
1514 	if (value) {
1515 		tmp |= BIT(SELF_POWERED_STATUS);
1516 		_gadget->is_selfpowered = 1;
1517 	} else {
1518 		tmp &= ~BIT(SELF_POWERED_STATUS);
1519 		_gadget->is_selfpowered = 0;
1520 	}
1521 	writel(tmp, &dev->usb->usbctl);
1522 	spin_unlock_irqrestore(&dev->lock, flags);
1523 
1524 	return 0;
1525 }
1526 
1527 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1528 {
1529 	struct net2280  *dev;
1530 	u32             tmp;
1531 	unsigned long   flags;
1532 
1533 	if (!_gadget)
1534 		return -ENODEV;
1535 	dev = container_of(_gadget, struct net2280, gadget);
1536 
1537 	spin_lock_irqsave(&dev->lock, flags);
1538 	tmp = readl(&dev->usb->usbctl);
1539 	dev->softconnect = (is_on != 0);
1540 	if (is_on) {
1541 		ep0_start(dev);
1542 		writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1543 	} else {
1544 		writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1545 		stop_activity(dev, dev->driver);
1546 	}
1547 
1548 	spin_unlock_irqrestore(&dev->lock, flags);
1549 
1550 	return 0;
1551 }
1552 
1553 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1554 		struct usb_endpoint_descriptor *desc,
1555 		struct usb_ss_ep_comp_descriptor *ep_comp)
1556 {
1557 	char name[8];
1558 	struct usb_ep *ep;
1559 
1560 	if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1561 		/* ep-e, ep-f are PIO with only 64 byte fifos */
1562 		ep = gadget_find_ep_by_name(_gadget, "ep-e");
1563 		if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1564 			return ep;
1565 		ep = gadget_find_ep_by_name(_gadget, "ep-f");
1566 		if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1567 			return ep;
1568 	}
1569 
1570 	/* USB3380: use same address for usb and hardware endpoints */
1571 	snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1572 			usb_endpoint_dir_in(desc) ? "in" : "out");
1573 	ep = gadget_find_ep_by_name(_gadget, name);
1574 	if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1575 		return ep;
1576 
1577 	return NULL;
1578 }
1579 
1580 static int net2280_start(struct usb_gadget *_gadget,
1581 		struct usb_gadget_driver *driver);
1582 static int net2280_stop(struct usb_gadget *_gadget);
1583 
1584 static const struct usb_gadget_ops net2280_ops = {
1585 	.get_frame	= net2280_get_frame,
1586 	.wakeup		= net2280_wakeup,
1587 	.set_selfpowered = net2280_set_selfpowered,
1588 	.pullup		= net2280_pullup,
1589 	.udc_start	= net2280_start,
1590 	.udc_stop	= net2280_stop,
1591 	.match_ep	= net2280_match_ep,
1592 };
1593 
1594 /*-------------------------------------------------------------------------*/
1595 
1596 #ifdef	CONFIG_USB_GADGET_DEBUG_FILES
1597 
1598 /* FIXME move these into procfs, and use seq_file.
1599  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1600  * and also doesn't help products using this with 2.4 kernels.
1601  */
1602 
1603 /* "function" sysfs attribute */
1604 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1605 			     char *buf)
1606 {
1607 	struct net2280	*dev = dev_get_drvdata(_dev);
1608 
1609 	if (!dev->driver || !dev->driver->function ||
1610 			strlen(dev->driver->function) > PAGE_SIZE)
1611 		return 0;
1612 	return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1613 }
1614 static DEVICE_ATTR_RO(function);
1615 
1616 static ssize_t registers_show(struct device *_dev,
1617 			      struct device_attribute *attr, char *buf)
1618 {
1619 	struct net2280		*dev;
1620 	char			*next;
1621 	unsigned		size, t;
1622 	unsigned long		flags;
1623 	int			i;
1624 	u32			t1, t2;
1625 	const char		*s;
1626 
1627 	dev = dev_get_drvdata(_dev);
1628 	next = buf;
1629 	size = PAGE_SIZE;
1630 	spin_lock_irqsave(&dev->lock, flags);
1631 
1632 	if (dev->driver)
1633 		s = dev->driver->driver.name;
1634 	else
1635 		s = "(none)";
1636 
1637 	/* Main Control Registers */
1638 	t = scnprintf(next, size, "%s version " DRIVER_VERSION
1639 			", chiprev %04x\n\n"
1640 			"devinit %03x fifoctl %08x gadget '%s'\n"
1641 			"pci irqenb0 %02x irqenb1 %08x "
1642 			"irqstat0 %04x irqstat1 %08x\n",
1643 			driver_name, dev->chiprev,
1644 			readl(&dev->regs->devinit),
1645 			readl(&dev->regs->fifoctl),
1646 			s,
1647 			readl(&dev->regs->pciirqenb0),
1648 			readl(&dev->regs->pciirqenb1),
1649 			readl(&dev->regs->irqstat0),
1650 			readl(&dev->regs->irqstat1));
1651 	size -= t;
1652 	next += t;
1653 
1654 	/* USB Control Registers */
1655 	t1 = readl(&dev->usb->usbctl);
1656 	t2 = readl(&dev->usb->usbstat);
1657 	if (t1 & BIT(VBUS_PIN)) {
1658 		if (t2 & BIT(HIGH_SPEED))
1659 			s = "high speed";
1660 		else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1661 			s = "powered";
1662 		else
1663 			s = "full speed";
1664 		/* full speed bit (6) not working?? */
1665 	} else
1666 			s = "not attached";
1667 	t = scnprintf(next, size,
1668 			"stdrsp %08x usbctl %08x usbstat %08x "
1669 				"addr 0x%02x (%s)\n",
1670 			readl(&dev->usb->stdrsp), t1, t2,
1671 			readl(&dev->usb->ouraddr), s);
1672 	size -= t;
1673 	next += t;
1674 
1675 	/* PCI Master Control Registers */
1676 
1677 	/* DMA Control Registers */
1678 
1679 	/* Configurable EP Control Registers */
1680 	for (i = 0; i < dev->n_ep; i++) {
1681 		struct net2280_ep	*ep;
1682 
1683 		ep = &dev->ep[i];
1684 		if (i && !ep->desc)
1685 			continue;
1686 
1687 		t1 = readl(&ep->cfg->ep_cfg);
1688 		t2 = readl(&ep->regs->ep_rsp) & 0xff;
1689 		t = scnprintf(next, size,
1690 				"\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1691 					"irqenb %02x\n",
1692 				ep->ep.name, t1, t2,
1693 				(t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1694 					? "NAK " : "",
1695 				(t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1696 					? "hide " : "",
1697 				(t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1698 					? "CRC " : "",
1699 				(t2 & BIT(CLEAR_INTERRUPT_MODE))
1700 					? "interrupt " : "",
1701 				(t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1702 					? "status " : "",
1703 				(t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1704 					? "NAKmode " : "",
1705 				(t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1706 					? "DATA1 " : "DATA0 ",
1707 				(t2 & BIT(CLEAR_ENDPOINT_HALT))
1708 					? "HALT " : "",
1709 				readl(&ep->regs->ep_irqenb));
1710 		size -= t;
1711 		next += t;
1712 
1713 		t = scnprintf(next, size,
1714 				"\tstat %08x avail %04x "
1715 				"(ep%d%s-%s)%s\n",
1716 				readl(&ep->regs->ep_stat),
1717 				readl(&ep->regs->ep_avail),
1718 				t1 & 0x0f, DIR_STRING(t1),
1719 				type_string(t1 >> 8),
1720 				ep->stopped ? "*" : "");
1721 		size -= t;
1722 		next += t;
1723 
1724 		if (!ep->dma)
1725 			continue;
1726 
1727 		t = scnprintf(next, size,
1728 				"  dma\tctl %08x stat %08x count %08x\n"
1729 				"\taddr %08x desc %08x\n",
1730 				readl(&ep->dma->dmactl),
1731 				readl(&ep->dma->dmastat),
1732 				readl(&ep->dma->dmacount),
1733 				readl(&ep->dma->dmaaddr),
1734 				readl(&ep->dma->dmadesc));
1735 		size -= t;
1736 		next += t;
1737 
1738 	}
1739 
1740 	/* Indexed Registers (none yet) */
1741 
1742 	/* Statistics */
1743 	t = scnprintf(next, size, "\nirqs:  ");
1744 	size -= t;
1745 	next += t;
1746 	for (i = 0; i < dev->n_ep; i++) {
1747 		struct net2280_ep	*ep;
1748 
1749 		ep = &dev->ep[i];
1750 		if (i && !ep->irqs)
1751 			continue;
1752 		t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1753 		size -= t;
1754 		next += t;
1755 
1756 	}
1757 	t = scnprintf(next, size, "\n");
1758 	size -= t;
1759 	next += t;
1760 
1761 	spin_unlock_irqrestore(&dev->lock, flags);
1762 
1763 	return PAGE_SIZE - size;
1764 }
1765 static DEVICE_ATTR_RO(registers);
1766 
1767 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1768 			   char *buf)
1769 {
1770 	struct net2280		*dev;
1771 	char			*next;
1772 	unsigned		size;
1773 	unsigned long		flags;
1774 	int			i;
1775 
1776 	dev = dev_get_drvdata(_dev);
1777 	next = buf;
1778 	size = PAGE_SIZE;
1779 	spin_lock_irqsave(&dev->lock, flags);
1780 
1781 	for (i = 0; i < dev->n_ep; i++) {
1782 		struct net2280_ep		*ep = &dev->ep[i];
1783 		struct net2280_request		*req;
1784 		int				t;
1785 
1786 		if (i != 0) {
1787 			const struct usb_endpoint_descriptor	*d;
1788 
1789 			d = ep->desc;
1790 			if (!d)
1791 				continue;
1792 			t = d->bEndpointAddress;
1793 			t = scnprintf(next, size,
1794 				"\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1795 				ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1796 				(t & USB_DIR_IN) ? "in" : "out",
1797 				type_string(d->bmAttributes),
1798 				usb_endpoint_maxp(d) & 0x1fff,
1799 				ep->dma ? "dma" : "pio", ep->fifo_size
1800 				);
1801 		} else /* ep0 should only have one transfer queued */
1802 			t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1803 					ep->is_in ? "in" : "out");
1804 		if (t <= 0 || t > size)
1805 			goto done;
1806 		size -= t;
1807 		next += t;
1808 
1809 		if (list_empty(&ep->queue)) {
1810 			t = scnprintf(next, size, "\t(nothing queued)\n");
1811 			if (t <= 0 || t > size)
1812 				goto done;
1813 			size -= t;
1814 			next += t;
1815 			continue;
1816 		}
1817 		list_for_each_entry(req, &ep->queue, queue) {
1818 			if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1819 				t = scnprintf(next, size,
1820 					"\treq %p len %d/%d "
1821 					"buf %p (dmacount %08x)\n",
1822 					&req->req, req->req.actual,
1823 					req->req.length, req->req.buf,
1824 					readl(&ep->dma->dmacount));
1825 			else
1826 				t = scnprintf(next, size,
1827 					"\treq %p len %d/%d buf %p\n",
1828 					&req->req, req->req.actual,
1829 					req->req.length, req->req.buf);
1830 			if (t <= 0 || t > size)
1831 				goto done;
1832 			size -= t;
1833 			next += t;
1834 
1835 			if (ep->dma) {
1836 				struct net2280_dma	*td;
1837 
1838 				td = req->td;
1839 				t = scnprintf(next, size, "\t    td %08x "
1840 					" count %08x buf %08x desc %08x\n",
1841 					(u32) req->td_dma,
1842 					le32_to_cpu(td->dmacount),
1843 					le32_to_cpu(td->dmaaddr),
1844 					le32_to_cpu(td->dmadesc));
1845 				if (t <= 0 || t > size)
1846 					goto done;
1847 				size -= t;
1848 				next += t;
1849 			}
1850 		}
1851 	}
1852 
1853 done:
1854 	spin_unlock_irqrestore(&dev->lock, flags);
1855 	return PAGE_SIZE - size;
1856 }
1857 static DEVICE_ATTR_RO(queues);
1858 
1859 
1860 #else
1861 
1862 #define device_create_file(a, b)	(0)
1863 #define device_remove_file(a, b)	do { } while (0)
1864 
1865 #endif
1866 
1867 /*-------------------------------------------------------------------------*/
1868 
1869 /* another driver-specific mode might be a request type doing dma
1870  * to/from another device fifo instead of to/from memory.
1871  */
1872 
1873 static void set_fifo_mode(struct net2280 *dev, int mode)
1874 {
1875 	/* keeping high bits preserves BAR2 */
1876 	writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1877 
1878 	/* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1879 	INIT_LIST_HEAD(&dev->gadget.ep_list);
1880 	list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1881 	list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1882 	switch (mode) {
1883 	case 0:
1884 		list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1885 		list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1886 		dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1887 		break;
1888 	case 1:
1889 		dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1890 		break;
1891 	case 2:
1892 		list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1893 		dev->ep[1].fifo_size = 2048;
1894 		dev->ep[2].fifo_size = 1024;
1895 		break;
1896 	}
1897 	/* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1898 	list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1899 	list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1900 }
1901 
1902 static void defect7374_disable_data_eps(struct net2280 *dev)
1903 {
1904 	/*
1905 	 * For Defect 7374, disable data EPs (and more):
1906 	 *  - This phase undoes the earlier phase of the Defect 7374 workaround,
1907 	 *    returing ep regs back to normal.
1908 	 */
1909 	struct net2280_ep *ep;
1910 	int i;
1911 	unsigned char ep_sel;
1912 	u32 tmp_reg;
1913 
1914 	for (i = 1; i < 5; i++) {
1915 		ep = &dev->ep[i];
1916 		writel(i, &ep->cfg->ep_cfg);
1917 	}
1918 
1919 	/* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1920 	for (i = 0; i < 6; i++)
1921 		writel(0, &dev->dep[i].dep_cfg);
1922 
1923 	for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1924 		/* Select an endpoint for subsequent operations: */
1925 		tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1926 		writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1927 
1928 		if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1929 					ep_sel == 18 || ep_sel == 20)
1930 			continue;
1931 
1932 		/* Change settings on some selected endpoints */
1933 		tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1934 		tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1935 		writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1936 		tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1937 		tmp_reg |= BIT(EP_INITIALIZED);
1938 		writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1939 	}
1940 }
1941 
1942 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1943 {
1944 	u32 tmp = 0, tmp_reg;
1945 	u32 scratch;
1946 	int i;
1947 	unsigned char ep_sel;
1948 
1949 	scratch = get_idx_reg(dev->regs, SCRATCH);
1950 
1951 	WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1952 		== DEFECT7374_FSM_SS_CONTROL_READ);
1953 
1954 	scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1955 
1956 	ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1957 	ep_warn(dev, "It will operate on cold-reboot and SS connect");
1958 
1959 	/*GPEPs:*/
1960 	tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
1961 			(2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
1962 			((dev->enhanced_mode) ?
1963 			 BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
1964 			 BIT(ENDPOINT_ENABLE)));
1965 
1966 	for (i = 1; i < 5; i++)
1967 		writel(tmp, &dev->ep[i].cfg->ep_cfg);
1968 
1969 	/* CSRIN, PCIIN, STATIN, RCIN*/
1970 	tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
1971 	writel(tmp, &dev->dep[1].dep_cfg);
1972 	writel(tmp, &dev->dep[3].dep_cfg);
1973 	writel(tmp, &dev->dep[4].dep_cfg);
1974 	writel(tmp, &dev->dep[5].dep_cfg);
1975 
1976 	/*Implemented for development and debug.
1977 	 * Can be refined/tuned later.*/
1978 	for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1979 		/* Select an endpoint for subsequent operations: */
1980 		tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1981 		writel(((tmp_reg & ~0x1f) | ep_sel),
1982 				&dev->plregs->pl_ep_ctrl);
1983 
1984 		if (ep_sel == 1) {
1985 			tmp =
1986 				(readl(&dev->plregs->pl_ep_ctrl) |
1987 				 BIT(CLEAR_ACK_ERROR_CODE) | 0);
1988 			writel(tmp, &dev->plregs->pl_ep_ctrl);
1989 			continue;
1990 		}
1991 
1992 		if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
1993 				ep_sel == 18  || ep_sel == 20)
1994 			continue;
1995 
1996 		tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
1997 				BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
1998 		writel(tmp, &dev->plregs->pl_ep_cfg_4);
1999 
2000 		tmp = readl(&dev->plregs->pl_ep_ctrl) &
2001 			~BIT(EP_INITIALIZED);
2002 		writel(tmp, &dev->plregs->pl_ep_ctrl);
2003 
2004 	}
2005 
2006 	/* Set FSM to focus on the first Control Read:
2007 	 * - Tip: Connection speed is known upon the first
2008 	 * setup request.*/
2009 	scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2010 	set_idx_reg(dev->regs, SCRATCH, scratch);
2011 
2012 }
2013 
2014 /* keeping it simple:
2015  * - one bus driver, initted first;
2016  * - one function driver, initted second
2017  *
2018  * most of the work to support multiple net2280 controllers would
2019  * be to associate this gadget driver (yes?) with all of them, or
2020  * perhaps to bind specific drivers to specific devices.
2021  */
2022 
2023 static void usb_reset_228x(struct net2280 *dev)
2024 {
2025 	u32	tmp;
2026 
2027 	dev->gadget.speed = USB_SPEED_UNKNOWN;
2028 	(void) readl(&dev->usb->usbctl);
2029 
2030 	net2280_led_init(dev);
2031 
2032 	/* disable automatic responses, and irqs */
2033 	writel(0, &dev->usb->stdrsp);
2034 	writel(0, &dev->regs->pciirqenb0);
2035 	writel(0, &dev->regs->pciirqenb1);
2036 
2037 	/* clear old dma and irq state */
2038 	for (tmp = 0; tmp < 4; tmp++) {
2039 		struct net2280_ep       *ep = &dev->ep[tmp + 1];
2040 		if (ep->dma)
2041 			abort_dma(ep);
2042 	}
2043 
2044 	writel(~0, &dev->regs->irqstat0),
2045 	writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2046 
2047 	/* reset, and enable pci */
2048 	tmp = readl(&dev->regs->devinit) |
2049 		BIT(PCI_ENABLE) |
2050 		BIT(FIFO_SOFT_RESET) |
2051 		BIT(USB_SOFT_RESET) |
2052 		BIT(M8051_RESET);
2053 	writel(tmp, &dev->regs->devinit);
2054 
2055 	/* standard fifo and endpoint allocations */
2056 	set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2057 }
2058 
2059 static void usb_reset_338x(struct net2280 *dev)
2060 {
2061 	u32 tmp;
2062 
2063 	dev->gadget.speed = USB_SPEED_UNKNOWN;
2064 	(void)readl(&dev->usb->usbctl);
2065 
2066 	net2280_led_init(dev);
2067 
2068 	if (dev->bug7734_patched) {
2069 		/* disable automatic responses, and irqs */
2070 		writel(0, &dev->usb->stdrsp);
2071 		writel(0, &dev->regs->pciirqenb0);
2072 		writel(0, &dev->regs->pciirqenb1);
2073 	}
2074 
2075 	/* clear old dma and irq state */
2076 	for (tmp = 0; tmp < 4; tmp++) {
2077 		struct net2280_ep *ep = &dev->ep[tmp + 1];
2078 		struct net2280_dma_regs __iomem *dma;
2079 
2080 		if (ep->dma) {
2081 			abort_dma(ep);
2082 		} else {
2083 			dma = &dev->dma[tmp];
2084 			writel(BIT(DMA_ABORT), &dma->dmastat);
2085 			writel(0, &dma->dmactl);
2086 		}
2087 	}
2088 
2089 	writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2090 
2091 	if (dev->bug7734_patched) {
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 
2099 		writel(tmp, &dev->regs->devinit);
2100 	}
2101 
2102 	/* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2103 	INIT_LIST_HEAD(&dev->gadget.ep_list);
2104 
2105 	for (tmp = 1; tmp < dev->n_ep; tmp++)
2106 		list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2107 
2108 }
2109 
2110 static void usb_reset(struct net2280 *dev)
2111 {
2112 	if (dev->quirks & PLX_LEGACY)
2113 		return usb_reset_228x(dev);
2114 	return usb_reset_338x(dev);
2115 }
2116 
2117 static void usb_reinit_228x(struct net2280 *dev)
2118 {
2119 	u32	tmp;
2120 
2121 	/* basic endpoint init */
2122 	for (tmp = 0; tmp < 7; tmp++) {
2123 		struct net2280_ep	*ep = &dev->ep[tmp];
2124 
2125 		ep->ep.name = ep_info_dft[tmp].name;
2126 		ep->ep.caps = ep_info_dft[tmp].caps;
2127 		ep->dev = dev;
2128 		ep->num = tmp;
2129 
2130 		if (tmp > 0 && tmp <= 4) {
2131 			ep->fifo_size = 1024;
2132 			ep->dma = &dev->dma[tmp - 1];
2133 		} else
2134 			ep->fifo_size = 64;
2135 		ep->regs = &dev->epregs[tmp];
2136 		ep->cfg = &dev->epregs[tmp];
2137 		ep_reset_228x(dev->regs, ep);
2138 	}
2139 	usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2140 	usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2141 	usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2142 
2143 	dev->gadget.ep0 = &dev->ep[0].ep;
2144 	dev->ep[0].stopped = 0;
2145 	INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2146 
2147 	/* we want to prevent lowlevel/insecure access from the USB host,
2148 	 * but erratum 0119 means this enable bit is ignored
2149 	 */
2150 	for (tmp = 0; tmp < 5; tmp++)
2151 		writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2152 }
2153 
2154 static void usb_reinit_338x(struct net2280 *dev)
2155 {
2156 	int i;
2157 	u32 tmp, val;
2158 	static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2159 	static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2160 						0x00, 0xC0, 0x00, 0xC0 };
2161 
2162 	/* basic endpoint init */
2163 	for (i = 0; i < dev->n_ep; i++) {
2164 		struct net2280_ep *ep = &dev->ep[i];
2165 
2166 		ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2167 						   ep_info_dft[i].name;
2168 		ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2169 						   ep_info_dft[i].caps;
2170 		ep->dev = dev;
2171 		ep->num = i;
2172 
2173 		if (i > 0 && i <= 4)
2174 			ep->dma = &dev->dma[i - 1];
2175 
2176 		if (dev->enhanced_mode) {
2177 			ep->cfg = &dev->epregs[ne[i]];
2178 			/*
2179 			 * Set USB endpoint number, hardware allows same number
2180 			 * in both directions.
2181 			 */
2182 			 if (i > 0 && i < 5)
2183 				writel(ne[i], &ep->cfg->ep_cfg);
2184 			ep->regs = (struct net2280_ep_regs __iomem *)
2185 				(((void __iomem *)&dev->epregs[ne[i]]) +
2186 				ep_reg_addr[i]);
2187 		} else {
2188 			ep->cfg = &dev->epregs[i];
2189 			ep->regs = &dev->epregs[i];
2190 		}
2191 
2192 		ep->fifo_size = (i != 0) ? 2048 : 512;
2193 
2194 		ep_reset_338x(dev->regs, ep);
2195 	}
2196 	usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2197 
2198 	dev->gadget.ep0 = &dev->ep[0].ep;
2199 	dev->ep[0].stopped = 0;
2200 
2201 	/* Link layer set up */
2202 	if (dev->bug7734_patched) {
2203 		tmp = readl(&dev->usb_ext->usbctl2) &
2204 		    ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2205 		writel(tmp, &dev->usb_ext->usbctl2);
2206 	}
2207 
2208 	/* Hardware Defect and Workaround */
2209 	val = readl(&dev->ll_lfps_regs->ll_lfps_5);
2210 	val &= ~(0xf << TIMER_LFPS_6US);
2211 	val |= 0x5 << TIMER_LFPS_6US;
2212 	writel(val, &dev->ll_lfps_regs->ll_lfps_5);
2213 
2214 	val = readl(&dev->ll_lfps_regs->ll_lfps_6);
2215 	val &= ~(0xffff << TIMER_LFPS_80US);
2216 	val |= 0x0100 << TIMER_LFPS_80US;
2217 	writel(val, &dev->ll_lfps_regs->ll_lfps_6);
2218 
2219 	/*
2220 	 * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2221 	 * Hot Reset Exit Handshake may Fail in Specific Case using
2222 	 * Default Register Settings. Workaround for Enumeration test.
2223 	 */
2224 	val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
2225 	val &= ~(0x1f << HOT_TX_NORESET_TS2);
2226 	val |= 0x10 << HOT_TX_NORESET_TS2;
2227 	writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
2228 
2229 	val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
2230 	val &= ~(0x1f << HOT_RX_RESET_TS2);
2231 	val |= 0x3 << HOT_RX_RESET_TS2;
2232 	writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
2233 
2234 	/*
2235 	 * Set Recovery Idle to Recover bit:
2236 	 * - On SS connections, setting Recovery Idle to Recover Fmw improves
2237 	 *   link robustness with various hosts and hubs.
2238 	 * - It is safe to set for all connection speeds; all chip revisions.
2239 	 * - R-M-W to leave other bits undisturbed.
2240 	 * - Reference PLX TT-7372
2241 	*/
2242 	val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
2243 	val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2244 	writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
2245 
2246 	INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2247 
2248 	/* disable dedicated endpoints */
2249 	writel(0x0D, &dev->dep[0].dep_cfg);
2250 	writel(0x0D, &dev->dep[1].dep_cfg);
2251 	writel(0x0E, &dev->dep[2].dep_cfg);
2252 	writel(0x0E, &dev->dep[3].dep_cfg);
2253 	writel(0x0F, &dev->dep[4].dep_cfg);
2254 	writel(0x0C, &dev->dep[5].dep_cfg);
2255 }
2256 
2257 static void usb_reinit(struct net2280 *dev)
2258 {
2259 	if (dev->quirks & PLX_LEGACY)
2260 		return usb_reinit_228x(dev);
2261 	return usb_reinit_338x(dev);
2262 }
2263 
2264 static void ep0_start_228x(struct net2280 *dev)
2265 {
2266 	writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2267 		BIT(CLEAR_NAK_OUT_PACKETS) |
2268 		BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2269 		&dev->epregs[0].ep_rsp);
2270 
2271 	/*
2272 	 * hardware optionally handles a bunch of standard requests
2273 	 * that the API hides from drivers anyway.  have it do so.
2274 	 * endpoint status/features are handled in software, to
2275 	 * help pass tests for some dubious behavior.
2276 	 */
2277 	writel(BIT(SET_TEST_MODE) |
2278 		BIT(SET_ADDRESS) |
2279 		BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2280 		BIT(GET_DEVICE_STATUS) |
2281 		BIT(GET_INTERFACE_STATUS),
2282 		&dev->usb->stdrsp);
2283 	writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2284 		BIT(SELF_POWERED_USB_DEVICE) |
2285 		BIT(REMOTE_WAKEUP_SUPPORT) |
2286 		(dev->softconnect << USB_DETECT_ENABLE) |
2287 		BIT(SELF_POWERED_STATUS),
2288 		&dev->usb->usbctl);
2289 
2290 	/* enable irqs so we can see ep0 and general operation  */
2291 	writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2292 		BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2293 		&dev->regs->pciirqenb0);
2294 	writel(BIT(PCI_INTERRUPT_ENABLE) |
2295 		BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2296 		BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2297 		BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2298 		BIT(VBUS_INTERRUPT_ENABLE) |
2299 		BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2300 		BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2301 		&dev->regs->pciirqenb1);
2302 
2303 	/* don't leave any writes posted */
2304 	(void) readl(&dev->usb->usbctl);
2305 }
2306 
2307 static void ep0_start_338x(struct net2280 *dev)
2308 {
2309 
2310 	if (dev->bug7734_patched)
2311 		writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2312 		       BIT(SET_EP_HIDE_STATUS_PHASE),
2313 		       &dev->epregs[0].ep_rsp);
2314 
2315 	/*
2316 	 * hardware optionally handles a bunch of standard requests
2317 	 * that the API hides from drivers anyway.  have it do so.
2318 	 * endpoint status/features are handled in software, to
2319 	 * help pass tests for some dubious behavior.
2320 	 */
2321 	writel(BIT(SET_ISOCHRONOUS_DELAY) |
2322 	       BIT(SET_SEL) |
2323 	       BIT(SET_TEST_MODE) |
2324 	       BIT(SET_ADDRESS) |
2325 	       BIT(GET_INTERFACE_STATUS) |
2326 	       BIT(GET_DEVICE_STATUS),
2327 		&dev->usb->stdrsp);
2328 	dev->wakeup_enable = 1;
2329 	writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2330 	       (dev->softconnect << USB_DETECT_ENABLE) |
2331 	       BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2332 	       &dev->usb->usbctl);
2333 
2334 	/* enable irqs so we can see ep0 and general operation  */
2335 	writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2336 	       BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2337 	       &dev->regs->pciirqenb0);
2338 	writel(BIT(PCI_INTERRUPT_ENABLE) |
2339 	       BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2340 	       BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2341 	       BIT(VBUS_INTERRUPT_ENABLE),
2342 	       &dev->regs->pciirqenb1);
2343 
2344 	/* don't leave any writes posted */
2345 	(void)readl(&dev->usb->usbctl);
2346 }
2347 
2348 static void ep0_start(struct net2280 *dev)
2349 {
2350 	if (dev->quirks & PLX_LEGACY)
2351 		return ep0_start_228x(dev);
2352 	return ep0_start_338x(dev);
2353 }
2354 
2355 /* when a driver is successfully registered, it will receive
2356  * control requests including set_configuration(), which enables
2357  * non-control requests.  then usb traffic follows until a
2358  * disconnect is reported.  then a host may connect again, or
2359  * the driver might get unbound.
2360  */
2361 static int net2280_start(struct usb_gadget *_gadget,
2362 		struct usb_gadget_driver *driver)
2363 {
2364 	struct net2280		*dev;
2365 	int			retval;
2366 	unsigned		i;
2367 
2368 	/* insist on high speed support from the driver, since
2369 	 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2370 	 * "must not be used in normal operation"
2371 	 */
2372 	if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2373 			!driver->setup)
2374 		return -EINVAL;
2375 
2376 	dev = container_of(_gadget, struct net2280, gadget);
2377 
2378 	for (i = 0; i < dev->n_ep; i++)
2379 		dev->ep[i].irqs = 0;
2380 
2381 	/* hook up the driver ... */
2382 	driver->driver.bus = NULL;
2383 	dev->driver = driver;
2384 
2385 	retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2386 	if (retval)
2387 		goto err_unbind;
2388 	retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2389 	if (retval)
2390 		goto err_func;
2391 
2392 	/* enable host detection and ep0; and we're ready
2393 	 * for set_configuration as well as eventual disconnect.
2394 	 */
2395 	net2280_led_active(dev, 1);
2396 
2397 	if ((dev->quirks & PLX_SUPERSPEED) && !dev->bug7734_patched)
2398 		defect7374_enable_data_eps_zero(dev);
2399 
2400 	ep0_start(dev);
2401 
2402 	/* pci writes may still be posted */
2403 	return 0;
2404 
2405 err_func:
2406 	device_remove_file(&dev->pdev->dev, &dev_attr_function);
2407 err_unbind:
2408 	dev->driver = NULL;
2409 	return retval;
2410 }
2411 
2412 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2413 {
2414 	int			i;
2415 
2416 	/* don't disconnect if it's not connected */
2417 	if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2418 		driver = NULL;
2419 
2420 	/* stop hardware; prevent new request submissions;
2421 	 * and kill any outstanding requests.
2422 	 */
2423 	usb_reset(dev);
2424 	for (i = 0; i < dev->n_ep; i++)
2425 		nuke(&dev->ep[i]);
2426 
2427 	/* report disconnect; the driver is already quiesced */
2428 	if (driver) {
2429 		spin_unlock(&dev->lock);
2430 		driver->disconnect(&dev->gadget);
2431 		spin_lock(&dev->lock);
2432 	}
2433 
2434 	usb_reinit(dev);
2435 }
2436 
2437 static int net2280_stop(struct usb_gadget *_gadget)
2438 {
2439 	struct net2280	*dev;
2440 	unsigned long	flags;
2441 
2442 	dev = container_of(_gadget, struct net2280, gadget);
2443 
2444 	spin_lock_irqsave(&dev->lock, flags);
2445 	stop_activity(dev, NULL);
2446 	spin_unlock_irqrestore(&dev->lock, flags);
2447 
2448 	net2280_led_active(dev, 0);
2449 
2450 	device_remove_file(&dev->pdev->dev, &dev_attr_function);
2451 	device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2452 
2453 	dev->driver = NULL;
2454 
2455 	return 0;
2456 }
2457 
2458 /*-------------------------------------------------------------------------*/
2459 
2460 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2461  * also works for dma-capable endpoints, in pio mode or just
2462  * to manually advance the queue after short OUT transfers.
2463  */
2464 static void handle_ep_small(struct net2280_ep *ep)
2465 {
2466 	struct net2280_request	*req;
2467 	u32			t;
2468 	/* 0 error, 1 mid-data, 2 done */
2469 	int			mode = 1;
2470 
2471 	if (!list_empty(&ep->queue))
2472 		req = list_entry(ep->queue.next,
2473 			struct net2280_request, queue);
2474 	else
2475 		req = NULL;
2476 
2477 	/* ack all, and handle what we care about */
2478 	t = readl(&ep->regs->ep_stat);
2479 	ep->irqs++;
2480 
2481 	ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2482 			ep->ep.name, t, req ? &req->req : NULL);
2483 
2484 	if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2485 		writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2486 	else
2487 		/* Added for 2282 */
2488 		writel(t, &ep->regs->ep_stat);
2489 
2490 	/* for ep0, monitor token irqs to catch data stage length errors
2491 	 * and to synchronize on status.
2492 	 *
2493 	 * also, to defer reporting of protocol stalls ... here's where
2494 	 * data or status first appears, handling stalls here should never
2495 	 * cause trouble on the host side..
2496 	 *
2497 	 * control requests could be slightly faster without token synch for
2498 	 * status, but status can jam up that way.
2499 	 */
2500 	if (unlikely(ep->num == 0)) {
2501 		if (ep->is_in) {
2502 			/* status; stop NAKing */
2503 			if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2504 				if (ep->dev->protocol_stall) {
2505 					ep->stopped = 1;
2506 					set_halt(ep);
2507 				}
2508 				if (!req)
2509 					allow_status(ep);
2510 				mode = 2;
2511 			/* reply to extra IN data tokens with a zlp */
2512 			} else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2513 				if (ep->dev->protocol_stall) {
2514 					ep->stopped = 1;
2515 					set_halt(ep);
2516 					mode = 2;
2517 				} else if (ep->responded &&
2518 						!req && !ep->stopped)
2519 					write_fifo(ep, NULL);
2520 			}
2521 		} else {
2522 			/* status; stop NAKing */
2523 			if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2524 				if (ep->dev->protocol_stall) {
2525 					ep->stopped = 1;
2526 					set_halt(ep);
2527 				}
2528 				mode = 2;
2529 			/* an extra OUT token is an error */
2530 			} else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2531 					req &&
2532 					req->req.actual == req->req.length) ||
2533 					(ep->responded && !req)) {
2534 				ep->dev->protocol_stall = 1;
2535 				set_halt(ep);
2536 				ep->stopped = 1;
2537 				if (req)
2538 					done(ep, req, -EOVERFLOW);
2539 				req = NULL;
2540 			}
2541 		}
2542 	}
2543 
2544 	if (unlikely(!req))
2545 		return;
2546 
2547 	/* manual DMA queue advance after short OUT */
2548 	if (likely(ep->dma)) {
2549 		if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2550 			u32	count;
2551 			int	stopped = ep->stopped;
2552 
2553 			/* TRANSFERRED works around OUT_DONE erratum 0112.
2554 			 * we expect (N <= maxpacket) bytes; host wrote M.
2555 			 * iff (M < N) we won't ever see a DMA interrupt.
2556 			 */
2557 			ep->stopped = 1;
2558 			for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2559 
2560 				/* any preceding dma transfers must finish.
2561 				 * dma handles (M >= N), may empty the queue
2562 				 */
2563 				scan_dma_completions(ep);
2564 				if (unlikely(list_empty(&ep->queue) ||
2565 						ep->out_overflow)) {
2566 					req = NULL;
2567 					break;
2568 				}
2569 				req = list_entry(ep->queue.next,
2570 					struct net2280_request, queue);
2571 
2572 				/* here either (M < N), a "real" short rx;
2573 				 * or (M == N) and the queue didn't empty
2574 				 */
2575 				if (likely(t & BIT(FIFO_EMPTY))) {
2576 					count = readl(&ep->dma->dmacount);
2577 					count &= DMA_BYTE_COUNT_MASK;
2578 					if (readl(&ep->dma->dmadesc)
2579 							!= req->td_dma)
2580 						req = NULL;
2581 					break;
2582 				}
2583 				udelay(1);
2584 			}
2585 
2586 			/* stop DMA, leave ep NAKing */
2587 			writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2588 			spin_stop_dma(ep->dma);
2589 
2590 			if (likely(req)) {
2591 				req->td->dmacount = 0;
2592 				t = readl(&ep->regs->ep_avail);
2593 				dma_done(ep, req, count,
2594 					(ep->out_overflow || t)
2595 						? -EOVERFLOW : 0);
2596 			}
2597 
2598 			/* also flush to prevent erratum 0106 trouble */
2599 			if (unlikely(ep->out_overflow ||
2600 					(ep->dev->chiprev == 0x0100 &&
2601 					ep->dev->gadget.speed
2602 					== USB_SPEED_FULL))) {
2603 				out_flush(ep);
2604 				ep->out_overflow = 0;
2605 			}
2606 
2607 			/* (re)start dma if needed, stop NAKing */
2608 			ep->stopped = stopped;
2609 			if (!list_empty(&ep->queue))
2610 				restart_dma(ep);
2611 		} else
2612 			ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2613 					ep->ep.name, t);
2614 		return;
2615 
2616 	/* data packet(s) received (in the fifo, OUT) */
2617 	} else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2618 		if (read_fifo(ep, req) && ep->num != 0)
2619 			mode = 2;
2620 
2621 	/* data packet(s) transmitted (IN) */
2622 	} else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2623 		unsigned	len;
2624 
2625 		len = req->req.length - req->req.actual;
2626 		if (len > ep->ep.maxpacket)
2627 			len = ep->ep.maxpacket;
2628 		req->req.actual += len;
2629 
2630 		/* if we wrote it all, we're usually done */
2631 		/* send zlps until the status stage */
2632 		if ((req->req.actual == req->req.length) &&
2633 			(!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2634 				mode = 2;
2635 
2636 	/* there was nothing to do ...  */
2637 	} else if (mode == 1)
2638 		return;
2639 
2640 	/* done */
2641 	if (mode == 2) {
2642 		/* stream endpoints often resubmit/unlink in completion */
2643 		done(ep, req, 0);
2644 
2645 		/* maybe advance queue to next request */
2646 		if (ep->num == 0) {
2647 			/* NOTE:  net2280 could let gadget driver start the
2648 			 * status stage later. since not all controllers let
2649 			 * them control that, the api doesn't (yet) allow it.
2650 			 */
2651 			if (!ep->stopped)
2652 				allow_status(ep);
2653 			req = NULL;
2654 		} else {
2655 			if (!list_empty(&ep->queue) && !ep->stopped)
2656 				req = list_entry(ep->queue.next,
2657 					struct net2280_request, queue);
2658 			else
2659 				req = NULL;
2660 			if (req && !ep->is_in)
2661 				stop_out_naking(ep);
2662 		}
2663 	}
2664 
2665 	/* is there a buffer for the next packet?
2666 	 * for best streaming performance, make sure there is one.
2667 	 */
2668 	if (req && !ep->stopped) {
2669 
2670 		/* load IN fifo with next packet (may be zlp) */
2671 		if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2672 			write_fifo(ep, &req->req);
2673 	}
2674 }
2675 
2676 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2677 {
2678 	struct net2280_ep	*ep;
2679 
2680 	if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2681 		return &dev->ep[0];
2682 	list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2683 		u8	bEndpointAddress;
2684 
2685 		if (!ep->desc)
2686 			continue;
2687 		bEndpointAddress = ep->desc->bEndpointAddress;
2688 		if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2689 			continue;
2690 		if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2691 			return ep;
2692 	}
2693 	return NULL;
2694 }
2695 
2696 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2697 {
2698 	u32 scratch, fsmvalue;
2699 	u32 ack_wait_timeout, state;
2700 
2701 	/* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2702 	scratch = get_idx_reg(dev->regs, SCRATCH);
2703 	fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2704 	scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2705 
2706 	if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2707 				(r.bRequestType & USB_DIR_IN)))
2708 		return;
2709 
2710 	/* This is the first Control Read for this connection: */
2711 	if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2712 		/*
2713 		 * Connection is NOT SS:
2714 		 * - Connection must be FS or HS.
2715 		 * - This FSM state should allow workaround software to
2716 		 * run after the next USB connection.
2717 		 */
2718 		scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2719 		dev->bug7734_patched = 1;
2720 		goto restore_data_eps;
2721 	}
2722 
2723 	/* Connection is SS: */
2724 	for (ack_wait_timeout = 0;
2725 			ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2726 			ack_wait_timeout++) {
2727 
2728 		state =	readl(&dev->plregs->pl_ep_status_1)
2729 			& (0xff << STATE);
2730 		if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2731 			(state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2732 			scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2733 			dev->bug7734_patched = 1;
2734 			break;
2735 		}
2736 
2737 		/*
2738 		 * We have not yet received host's Data Phase ACK
2739 		 * - Wait and try again.
2740 		 */
2741 		udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2742 
2743 		continue;
2744 	}
2745 
2746 
2747 	if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2748 		ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2749 		"to detect SS host's data phase ACK.");
2750 		ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2751 		"got 0x%2.2x.\n", state >> STATE);
2752 	} else {
2753 		ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2754 		"%duSec for Control Read Data Phase ACK\n",
2755 			DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2756 	}
2757 
2758 restore_data_eps:
2759 	/*
2760 	 * Restore data EPs to their pre-workaround settings (disabled,
2761 	 * initialized, and other details).
2762 	 */
2763 	defect7374_disable_data_eps(dev);
2764 
2765 	set_idx_reg(dev->regs, SCRATCH, scratch);
2766 
2767 	return;
2768 }
2769 
2770 static void ep_clear_seqnum(struct net2280_ep *ep)
2771 {
2772 	struct net2280 *dev = ep->dev;
2773 	u32 val;
2774 	static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2775 
2776 	val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2777 	val |= ep_pl[ep->num];
2778 	writel(val, &dev->plregs->pl_ep_ctrl);
2779 	val |= BIT(SEQUENCE_NUMBER_RESET);
2780 	writel(val, &dev->plregs->pl_ep_ctrl);
2781 
2782 	return;
2783 }
2784 
2785 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2786 		struct net2280_ep *ep, struct usb_ctrlrequest r)
2787 {
2788 	int tmp = 0;
2789 
2790 #define	w_value		le16_to_cpu(r.wValue)
2791 #define	w_index		le16_to_cpu(r.wIndex)
2792 #define	w_length	le16_to_cpu(r.wLength)
2793 
2794 	switch (r.bRequest) {
2795 		struct net2280_ep *e;
2796 		u16 status;
2797 
2798 	case USB_REQ_SET_CONFIGURATION:
2799 		dev->addressed_state = !w_value;
2800 		goto usb3_delegate;
2801 
2802 	case USB_REQ_GET_STATUS:
2803 		switch (r.bRequestType) {
2804 		case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2805 			status = dev->wakeup_enable ? 0x02 : 0x00;
2806 			if (dev->gadget.is_selfpowered)
2807 				status |= BIT(0);
2808 			status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2809 							dev->ltm_enable << 4);
2810 			writel(0, &dev->epregs[0].ep_irqenb);
2811 			set_fifo_bytecount(ep, sizeof(status));
2812 			writel((__force u32) status, &dev->epregs[0].ep_data);
2813 			allow_status_338x(ep);
2814 			break;
2815 
2816 		case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2817 			e = get_ep_by_addr(dev, w_index);
2818 			if (!e)
2819 				goto do_stall3;
2820 			status = readl(&e->regs->ep_rsp) &
2821 						BIT(CLEAR_ENDPOINT_HALT);
2822 			writel(0, &dev->epregs[0].ep_irqenb);
2823 			set_fifo_bytecount(ep, sizeof(status));
2824 			writel((__force u32) status, &dev->epregs[0].ep_data);
2825 			allow_status_338x(ep);
2826 			break;
2827 
2828 		default:
2829 			goto usb3_delegate;
2830 		}
2831 		break;
2832 
2833 	case USB_REQ_CLEAR_FEATURE:
2834 		switch (r.bRequestType) {
2835 		case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2836 			if (!dev->addressed_state) {
2837 				switch (w_value) {
2838 				case USB_DEVICE_U1_ENABLE:
2839 					dev->u1_enable = 0;
2840 					writel(readl(&dev->usb_ext->usbctl2) &
2841 						~BIT(U1_ENABLE),
2842 						&dev->usb_ext->usbctl2);
2843 					allow_status_338x(ep);
2844 					goto next_endpoints3;
2845 
2846 				case USB_DEVICE_U2_ENABLE:
2847 					dev->u2_enable = 0;
2848 					writel(readl(&dev->usb_ext->usbctl2) &
2849 						~BIT(U2_ENABLE),
2850 						&dev->usb_ext->usbctl2);
2851 					allow_status_338x(ep);
2852 					goto next_endpoints3;
2853 
2854 				case USB_DEVICE_LTM_ENABLE:
2855 					dev->ltm_enable = 0;
2856 					writel(readl(&dev->usb_ext->usbctl2) &
2857 						~BIT(LTM_ENABLE),
2858 						&dev->usb_ext->usbctl2);
2859 					allow_status_338x(ep);
2860 					goto next_endpoints3;
2861 
2862 				default:
2863 					break;
2864 				}
2865 			}
2866 			if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2867 				dev->wakeup_enable = 0;
2868 				writel(readl(&dev->usb->usbctl) &
2869 					~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2870 					&dev->usb->usbctl);
2871 				allow_status_338x(ep);
2872 				break;
2873 			}
2874 			goto usb3_delegate;
2875 
2876 		case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2877 			e = get_ep_by_addr(dev,	w_index);
2878 			if (!e)
2879 				goto do_stall3;
2880 			if (w_value != USB_ENDPOINT_HALT)
2881 				goto do_stall3;
2882 			ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2883 			/*
2884 			 * Workaround for SS SeqNum not cleared via
2885 			 * Endpoint Halt (Clear) bit. select endpoint
2886 			 */
2887 			ep_clear_seqnum(e);
2888 			clear_halt(e);
2889 			if (!list_empty(&e->queue) && e->td_dma)
2890 				restart_dma(e);
2891 			allow_status(ep);
2892 			ep->stopped = 1;
2893 			break;
2894 
2895 		default:
2896 			goto usb3_delegate;
2897 		}
2898 		break;
2899 	case USB_REQ_SET_FEATURE:
2900 		switch (r.bRequestType) {
2901 		case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2902 			if (!dev->addressed_state) {
2903 				switch (w_value) {
2904 				case USB_DEVICE_U1_ENABLE:
2905 					dev->u1_enable = 1;
2906 					writel(readl(&dev->usb_ext->usbctl2) |
2907 						BIT(U1_ENABLE),
2908 						&dev->usb_ext->usbctl2);
2909 					allow_status_338x(ep);
2910 					goto next_endpoints3;
2911 
2912 				case USB_DEVICE_U2_ENABLE:
2913 					dev->u2_enable = 1;
2914 					writel(readl(&dev->usb_ext->usbctl2) |
2915 						BIT(U2_ENABLE),
2916 						&dev->usb_ext->usbctl2);
2917 					allow_status_338x(ep);
2918 					goto next_endpoints3;
2919 
2920 				case USB_DEVICE_LTM_ENABLE:
2921 					dev->ltm_enable = 1;
2922 					writel(readl(&dev->usb_ext->usbctl2) |
2923 						BIT(LTM_ENABLE),
2924 						&dev->usb_ext->usbctl2);
2925 					allow_status_338x(ep);
2926 					goto next_endpoints3;
2927 				default:
2928 					break;
2929 				}
2930 			}
2931 
2932 			if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2933 				dev->wakeup_enable = 1;
2934 				writel(readl(&dev->usb->usbctl) |
2935 					BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2936 					&dev->usb->usbctl);
2937 				allow_status_338x(ep);
2938 				break;
2939 			}
2940 			goto usb3_delegate;
2941 
2942 		case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2943 			e = get_ep_by_addr(dev,	w_index);
2944 			if (!e || (w_value != USB_ENDPOINT_HALT))
2945 				goto do_stall3;
2946 			ep->stopped = 1;
2947 			if (ep->num == 0)
2948 				ep->dev->protocol_stall = 1;
2949 			else {
2950 				if (ep->dma)
2951 					abort_dma(ep);
2952 				set_halt(ep);
2953 			}
2954 			allow_status_338x(ep);
2955 			break;
2956 
2957 		default:
2958 			goto usb3_delegate;
2959 		}
2960 
2961 		break;
2962 	default:
2963 
2964 usb3_delegate:
2965 		ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
2966 				r.bRequestType, r.bRequest,
2967 				w_value, w_index, w_length,
2968 				readl(&ep->cfg->ep_cfg));
2969 
2970 		ep->responded = 0;
2971 		spin_unlock(&dev->lock);
2972 		tmp = dev->driver->setup(&dev->gadget, &r);
2973 		spin_lock(&dev->lock);
2974 	}
2975 do_stall3:
2976 	if (tmp < 0) {
2977 		ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
2978 				r.bRequestType, r.bRequest, tmp);
2979 		dev->protocol_stall = 1;
2980 		/* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
2981 		set_halt(ep);
2982 	}
2983 
2984 next_endpoints3:
2985 
2986 #undef	w_value
2987 #undef	w_index
2988 #undef	w_length
2989 
2990 	return;
2991 }
2992 
2993 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
2994 {
2995 	u32 index;
2996 	u32 bit;
2997 
2998 	for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
2999 		bit = BIT(ep_bit[index]);
3000 
3001 		if (!stat0)
3002 			break;
3003 
3004 		if (!(stat0 & bit))
3005 			continue;
3006 
3007 		stat0 &= ~bit;
3008 
3009 		handle_ep_small(&dev->ep[index]);
3010 	}
3011 }
3012 
3013 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3014 {
3015 	struct net2280_ep	*ep;
3016 	u32			num, scratch;
3017 
3018 	/* most of these don't need individual acks */
3019 	stat &= ~BIT(INTA_ASSERTED);
3020 	if (!stat)
3021 		return;
3022 	/* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3023 
3024 	/* starting a control request? */
3025 	if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3026 		union {
3027 			u32			raw[2];
3028 			struct usb_ctrlrequest	r;
3029 		} u;
3030 		int				tmp;
3031 		struct net2280_request		*req;
3032 
3033 		if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3034 			u32 val = readl(&dev->usb->usbstat);
3035 			if (val & BIT(SUPER_SPEED)) {
3036 				dev->gadget.speed = USB_SPEED_SUPER;
3037 				usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3038 						EP0_SS_MAX_PACKET_SIZE);
3039 			} else if (val & BIT(HIGH_SPEED)) {
3040 				dev->gadget.speed = USB_SPEED_HIGH;
3041 				usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3042 						EP0_HS_MAX_PACKET_SIZE);
3043 			} else {
3044 				dev->gadget.speed = USB_SPEED_FULL;
3045 				usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3046 						EP0_HS_MAX_PACKET_SIZE);
3047 			}
3048 			net2280_led_speed(dev, dev->gadget.speed);
3049 			ep_dbg(dev, "%s\n",
3050 					usb_speed_string(dev->gadget.speed));
3051 		}
3052 
3053 		ep = &dev->ep[0];
3054 		ep->irqs++;
3055 
3056 		/* make sure any leftover request state is cleared */
3057 		stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3058 		while (!list_empty(&ep->queue)) {
3059 			req = list_entry(ep->queue.next,
3060 					struct net2280_request, queue);
3061 			done(ep, req, (req->req.actual == req->req.length)
3062 						? 0 : -EPROTO);
3063 		}
3064 		ep->stopped = 0;
3065 		dev->protocol_stall = 0;
3066 		if (!(dev->quirks & PLX_SUPERSPEED)) {
3067 			if (ep->dev->quirks & PLX_2280)
3068 				tmp = BIT(FIFO_OVERFLOW) |
3069 				    BIT(FIFO_UNDERFLOW);
3070 			else
3071 				tmp = 0;
3072 
3073 			writel(tmp | BIT(TIMEOUT) |
3074 				   BIT(USB_STALL_SENT) |
3075 				   BIT(USB_IN_NAK_SENT) |
3076 				   BIT(USB_IN_ACK_RCVD) |
3077 				   BIT(USB_OUT_PING_NAK_SENT) |
3078 				   BIT(USB_OUT_ACK_SENT) |
3079 				   BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3080 				   BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3081 				   BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3082 				   BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3083 				   BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3084 				   BIT(DATA_IN_TOKEN_INTERRUPT),
3085 				   &ep->regs->ep_stat);
3086 		}
3087 		u.raw[0] = readl(&dev->usb->setup0123);
3088 		u.raw[1] = readl(&dev->usb->setup4567);
3089 
3090 		cpu_to_le32s(&u.raw[0]);
3091 		cpu_to_le32s(&u.raw[1]);
3092 
3093 		if ((dev->quirks & PLX_SUPERSPEED) && !dev->bug7734_patched)
3094 			defect7374_workaround(dev, u.r);
3095 
3096 		tmp = 0;
3097 
3098 #define	w_value		le16_to_cpu(u.r.wValue)
3099 #define	w_index		le16_to_cpu(u.r.wIndex)
3100 #define	w_length	le16_to_cpu(u.r.wLength)
3101 
3102 		/* ack the irq */
3103 		writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3104 		stat ^= BIT(SETUP_PACKET_INTERRUPT);
3105 
3106 		/* watch control traffic at the token level, and force
3107 		 * synchronization before letting the status stage happen.
3108 		 * FIXME ignore tokens we'll NAK, until driver responds.
3109 		 * that'll mean a lot less irqs for some drivers.
3110 		 */
3111 		ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3112 		if (ep->is_in) {
3113 			scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3114 				BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3115 				BIT(DATA_IN_TOKEN_INTERRUPT);
3116 			stop_out_naking(ep);
3117 		} else
3118 			scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3119 				BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3120 				BIT(DATA_IN_TOKEN_INTERRUPT);
3121 		writel(scratch, &dev->epregs[0].ep_irqenb);
3122 
3123 		/* we made the hardware handle most lowlevel requests;
3124 		 * everything else goes uplevel to the gadget code.
3125 		 */
3126 		ep->responded = 1;
3127 
3128 		if (dev->gadget.speed == USB_SPEED_SUPER) {
3129 			handle_stat0_irqs_superspeed(dev, ep, u.r);
3130 			goto next_endpoints;
3131 		}
3132 
3133 		switch (u.r.bRequest) {
3134 		case USB_REQ_GET_STATUS: {
3135 			struct net2280_ep	*e;
3136 			__le32			status;
3137 
3138 			/* hw handles device and interface status */
3139 			if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3140 				goto delegate;
3141 			e = get_ep_by_addr(dev, w_index);
3142 			if (!e || w_length > 2)
3143 				goto do_stall;
3144 
3145 			if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3146 				status = cpu_to_le32(1);
3147 			else
3148 				status = cpu_to_le32(0);
3149 
3150 			/* don't bother with a request object! */
3151 			writel(0, &dev->epregs[0].ep_irqenb);
3152 			set_fifo_bytecount(ep, w_length);
3153 			writel((__force u32)status, &dev->epregs[0].ep_data);
3154 			allow_status(ep);
3155 			ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3156 			goto next_endpoints;
3157 			}
3158 			break;
3159 		case USB_REQ_CLEAR_FEATURE: {
3160 			struct net2280_ep	*e;
3161 
3162 			/* hw handles device features */
3163 			if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3164 				goto delegate;
3165 			if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3166 				goto do_stall;
3167 			e = get_ep_by_addr(dev, w_index);
3168 			if (!e)
3169 				goto do_stall;
3170 			if (e->wedged) {
3171 				ep_vdbg(dev, "%s wedged, halt not cleared\n",
3172 						ep->ep.name);
3173 			} else {
3174 				ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3175 				clear_halt(e);
3176 				if ((ep->dev->quirks & PLX_SUPERSPEED) &&
3177 					!list_empty(&e->queue) && e->td_dma)
3178 						restart_dma(e);
3179 			}
3180 			allow_status(ep);
3181 			goto next_endpoints;
3182 			}
3183 			break;
3184 		case USB_REQ_SET_FEATURE: {
3185 			struct net2280_ep	*e;
3186 
3187 			/* hw handles device features */
3188 			if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3189 				goto delegate;
3190 			if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3191 				goto do_stall;
3192 			e = get_ep_by_addr(dev, w_index);
3193 			if (!e)
3194 				goto do_stall;
3195 			if (e->ep.name == ep0name)
3196 				goto do_stall;
3197 			set_halt(e);
3198 			if ((dev->quirks & PLX_SUPERSPEED) && e->dma)
3199 				abort_dma(e);
3200 			allow_status(ep);
3201 			ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3202 			goto next_endpoints;
3203 			}
3204 			break;
3205 		default:
3206 delegate:
3207 			ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3208 				"ep_cfg %08x\n",
3209 				u.r.bRequestType, u.r.bRequest,
3210 				w_value, w_index, w_length,
3211 				readl(&ep->cfg->ep_cfg));
3212 			ep->responded = 0;
3213 			spin_unlock(&dev->lock);
3214 			tmp = dev->driver->setup(&dev->gadget, &u.r);
3215 			spin_lock(&dev->lock);
3216 		}
3217 
3218 		/* stall ep0 on error */
3219 		if (tmp < 0) {
3220 do_stall:
3221 			ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3222 					u.r.bRequestType, u.r.bRequest, tmp);
3223 			dev->protocol_stall = 1;
3224 		}
3225 
3226 		/* some in/out token irq should follow; maybe stall then.
3227 		 * driver must queue a request (even zlp) or halt ep0
3228 		 * before the host times out.
3229 		 */
3230 	}
3231 
3232 #undef	w_value
3233 #undef	w_index
3234 #undef	w_length
3235 
3236 next_endpoints:
3237 	if ((dev->quirks & PLX_SUPERSPEED) && dev->enhanced_mode) {
3238 		u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3239 			USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3240 			USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3241 
3242 		if (stat & mask) {
3243 			usb338x_handle_ep_intr(dev, stat & mask);
3244 			stat &= ~mask;
3245 		}
3246 	} else {
3247 		/* endpoint data irq ? */
3248 		scratch = stat & 0x7f;
3249 		stat &= ~0x7f;
3250 		for (num = 0; scratch; num++) {
3251 			u32		t;
3252 
3253 			/* do this endpoint's FIFO and queue need tending? */
3254 			t = BIT(num);
3255 			if ((scratch & t) == 0)
3256 				continue;
3257 			scratch ^= t;
3258 
3259 			ep = &dev->ep[num];
3260 			handle_ep_small(ep);
3261 		}
3262 	}
3263 
3264 	if (stat)
3265 		ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3266 }
3267 
3268 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3269 		BIT(DMA_C_INTERRUPT) | \
3270 		BIT(DMA_B_INTERRUPT) | \
3271 		BIT(DMA_A_INTERRUPT))
3272 #define	PCI_ERROR_INTERRUPTS ( \
3273 		BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3274 		BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3275 		BIT(PCI_RETRY_ABORT_INTERRUPT))
3276 
3277 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3278 __releases(dev->lock)
3279 __acquires(dev->lock)
3280 {
3281 	struct net2280_ep	*ep;
3282 	u32			tmp, num, mask, scratch;
3283 
3284 	/* after disconnect there's nothing else to do! */
3285 	tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3286 	mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3287 
3288 	/* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3289 	 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3290 	 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3291 	 * only indicates a change in the reset state).
3292 	 */
3293 	if (stat & tmp) {
3294 		bool	reset = false;
3295 		bool	disconnect = false;
3296 
3297 		/*
3298 		 * Ignore disconnects and resets if the speed hasn't been set.
3299 		 * VBUS can bounce and there's always an initial reset.
3300 		 */
3301 		writel(tmp, &dev->regs->irqstat1);
3302 		if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3303 			if ((stat & BIT(VBUS_INTERRUPT)) &&
3304 					(readl(&dev->usb->usbctl) &
3305 						BIT(VBUS_PIN)) == 0) {
3306 				disconnect = true;
3307 				ep_dbg(dev, "disconnect %s\n",
3308 						dev->driver->driver.name);
3309 			} else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3310 					(readl(&dev->usb->usbstat) & mask)
3311 						== 0) {
3312 				reset = true;
3313 				ep_dbg(dev, "reset %s\n",
3314 						dev->driver->driver.name);
3315 			}
3316 
3317 			if (disconnect || reset) {
3318 				stop_activity(dev, dev->driver);
3319 				ep0_start(dev);
3320 				spin_unlock(&dev->lock);
3321 				if (reset)
3322 					usb_gadget_udc_reset
3323 						(&dev->gadget, dev->driver);
3324 				else
3325 					(dev->driver->disconnect)
3326 						(&dev->gadget);
3327 				spin_lock(&dev->lock);
3328 				return;
3329 			}
3330 		}
3331 		stat &= ~tmp;
3332 
3333 		/* vBUS can bounce ... one of many reasons to ignore the
3334 		 * notion of hotplug events on bus connect/disconnect!
3335 		 */
3336 		if (!stat)
3337 			return;
3338 	}
3339 
3340 	/* NOTE: chip stays in PCI D0 state for now, but it could
3341 	 * enter D1 to save more power
3342 	 */
3343 	tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3344 	if (stat & tmp) {
3345 		writel(tmp, &dev->regs->irqstat1);
3346 		if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3347 			if (dev->driver->suspend)
3348 				dev->driver->suspend(&dev->gadget);
3349 			if (!enable_suspend)
3350 				stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3351 		} else {
3352 			if (dev->driver->resume)
3353 				dev->driver->resume(&dev->gadget);
3354 			/* at high speed, note erratum 0133 */
3355 		}
3356 		stat &= ~tmp;
3357 	}
3358 
3359 	/* clear any other status/irqs */
3360 	if (stat)
3361 		writel(stat, &dev->regs->irqstat1);
3362 
3363 	/* some status we can just ignore */
3364 	if (dev->quirks & PLX_2280)
3365 		stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3366 			  BIT(SUSPEND_REQUEST_INTERRUPT) |
3367 			  BIT(RESUME_INTERRUPT) |
3368 			  BIT(SOF_INTERRUPT));
3369 	else
3370 		stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3371 			  BIT(RESUME_INTERRUPT) |
3372 			  BIT(SOF_DOWN_INTERRUPT) |
3373 			  BIT(SOF_INTERRUPT));
3374 
3375 	if (!stat)
3376 		return;
3377 	/* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3378 
3379 	/* DMA status, for ep-{a,b,c,d} */
3380 	scratch = stat & DMA_INTERRUPTS;
3381 	stat &= ~DMA_INTERRUPTS;
3382 	scratch >>= 9;
3383 	for (num = 0; scratch; num++) {
3384 		struct net2280_dma_regs	__iomem *dma;
3385 
3386 		tmp = BIT(num);
3387 		if ((tmp & scratch) == 0)
3388 			continue;
3389 		scratch ^= tmp;
3390 
3391 		ep = &dev->ep[num + 1];
3392 		dma = ep->dma;
3393 
3394 		if (!dma)
3395 			continue;
3396 
3397 		/* clear ep's dma status */
3398 		tmp = readl(&dma->dmastat);
3399 		writel(tmp, &dma->dmastat);
3400 
3401 		/* dma sync*/
3402 		if (dev->quirks & PLX_SUPERSPEED) {
3403 			u32 r_dmacount = readl(&dma->dmacount);
3404 			if (!ep->is_in &&  (r_dmacount & 0x00FFFFFF) &&
3405 			    (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3406 				continue;
3407 		}
3408 
3409 		if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3410 			ep_dbg(ep->dev, "%s no xact done? %08x\n",
3411 				ep->ep.name, tmp);
3412 			continue;
3413 		}
3414 		stop_dma(ep->dma);
3415 
3416 		/* OUT transfers terminate when the data from the
3417 		 * host is in our memory.  Process whatever's done.
3418 		 * On this path, we know transfer's last packet wasn't
3419 		 * less than req->length. NAK_OUT_PACKETS may be set,
3420 		 * or the FIFO may already be holding new packets.
3421 		 *
3422 		 * IN transfers can linger in the FIFO for a very
3423 		 * long time ... we ignore that for now, accounting
3424 		 * precisely (like PIO does) needs per-packet irqs
3425 		 */
3426 		scan_dma_completions(ep);
3427 
3428 		/* disable dma on inactive queues; else maybe restart */
3429 		if (!list_empty(&ep->queue)) {
3430 			tmp = readl(&dma->dmactl);
3431 			restart_dma(ep);
3432 		}
3433 		ep->irqs++;
3434 	}
3435 
3436 	/* NOTE:  there are other PCI errors we might usefully notice.
3437 	 * if they appear very often, here's where to try recovering.
3438 	 */
3439 	if (stat & PCI_ERROR_INTERRUPTS) {
3440 		ep_err(dev, "pci dma error; stat %08x\n", stat);
3441 		stat &= ~PCI_ERROR_INTERRUPTS;
3442 		/* these are fatal errors, but "maybe" they won't
3443 		 * happen again ...
3444 		 */
3445 		stop_activity(dev, dev->driver);
3446 		ep0_start(dev);
3447 		stat = 0;
3448 	}
3449 
3450 	if (stat)
3451 		ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3452 }
3453 
3454 static irqreturn_t net2280_irq(int irq, void *_dev)
3455 {
3456 	struct net2280		*dev = _dev;
3457 
3458 	/* shared interrupt, not ours */
3459 	if ((dev->quirks & PLX_LEGACY) &&
3460 		(!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3461 		return IRQ_NONE;
3462 
3463 	spin_lock(&dev->lock);
3464 
3465 	/* handle disconnect, dma, and more */
3466 	handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3467 
3468 	/* control requests and PIO */
3469 	handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3470 
3471 	if (dev->quirks & PLX_SUPERSPEED) {
3472 		/* re-enable interrupt to trigger any possible new interrupt */
3473 		u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3474 		writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3475 		writel(pciirqenb1, &dev->regs->pciirqenb1);
3476 	}
3477 
3478 	spin_unlock(&dev->lock);
3479 
3480 	return IRQ_HANDLED;
3481 }
3482 
3483 /*-------------------------------------------------------------------------*/
3484 
3485 static void gadget_release(struct device *_dev)
3486 {
3487 	struct net2280	*dev = dev_get_drvdata(_dev);
3488 
3489 	kfree(dev);
3490 }
3491 
3492 /* tear down the binding between this driver and the pci device */
3493 
3494 static void net2280_remove(struct pci_dev *pdev)
3495 {
3496 	struct net2280		*dev = pci_get_drvdata(pdev);
3497 
3498 	usb_del_gadget_udc(&dev->gadget);
3499 
3500 	BUG_ON(dev->driver);
3501 
3502 	/* then clean up the resources we allocated during probe() */
3503 	net2280_led_shutdown(dev);
3504 	if (dev->requests) {
3505 		int		i;
3506 		for (i = 1; i < 5; i++) {
3507 			if (!dev->ep[i].dummy)
3508 				continue;
3509 			pci_pool_free(dev->requests, dev->ep[i].dummy,
3510 					dev->ep[i].td_dma);
3511 		}
3512 		pci_pool_destroy(dev->requests);
3513 	}
3514 	if (dev->got_irq)
3515 		free_irq(pdev->irq, dev);
3516 	if (dev->quirks & PLX_SUPERSPEED)
3517 		pci_disable_msi(pdev);
3518 	if (dev->regs)
3519 		iounmap(dev->regs);
3520 	if (dev->region)
3521 		release_mem_region(pci_resource_start(pdev, 0),
3522 				pci_resource_len(pdev, 0));
3523 	if (dev->enabled)
3524 		pci_disable_device(pdev);
3525 	device_remove_file(&pdev->dev, &dev_attr_registers);
3526 
3527 	ep_info(dev, "unbind\n");
3528 }
3529 
3530 /* wrap this driver around the specified device, but
3531  * don't respond over USB until a gadget driver binds to us.
3532  */
3533 
3534 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3535 {
3536 	struct net2280		*dev;
3537 	unsigned long		resource, len;
3538 	void			__iomem *base = NULL;
3539 	int			retval, i;
3540 
3541 	/* alloc, and start init */
3542 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3543 	if (dev == NULL) {
3544 		retval = -ENOMEM;
3545 		goto done;
3546 	}
3547 
3548 	pci_set_drvdata(pdev, dev);
3549 	spin_lock_init(&dev->lock);
3550 	dev->quirks = id->driver_data;
3551 	dev->pdev = pdev;
3552 	dev->gadget.ops = &net2280_ops;
3553 	dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3554 				USB_SPEED_SUPER : USB_SPEED_HIGH;
3555 
3556 	/* the "gadget" abstracts/virtualizes the controller */
3557 	dev->gadget.name = driver_name;
3558 
3559 	/* now all the pci goodies ... */
3560 	if (pci_enable_device(pdev) < 0) {
3561 		retval = -ENODEV;
3562 		goto done;
3563 	}
3564 	dev->enabled = 1;
3565 
3566 	/* BAR 0 holds all the registers
3567 	 * BAR 1 is 8051 memory; unused here (note erratum 0103)
3568 	 * BAR 2 is fifo memory; unused here
3569 	 */
3570 	resource = pci_resource_start(pdev, 0);
3571 	len = pci_resource_len(pdev, 0);
3572 	if (!request_mem_region(resource, len, driver_name)) {
3573 		ep_dbg(dev, "controller already in use\n");
3574 		retval = -EBUSY;
3575 		goto done;
3576 	}
3577 	dev->region = 1;
3578 
3579 	/* FIXME provide firmware download interface to put
3580 	 * 8051 code into the chip, e.g. to turn on PCI PM.
3581 	 */
3582 
3583 	base = ioremap_nocache(resource, len);
3584 	if (base == NULL) {
3585 		ep_dbg(dev, "can't map memory\n");
3586 		retval = -EFAULT;
3587 		goto done;
3588 	}
3589 	dev->regs = (struct net2280_regs __iomem *) base;
3590 	dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3591 	dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3592 	dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3593 	dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3594 	dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3595 
3596 	if (dev->quirks & PLX_SUPERSPEED) {
3597 		u32 fsmvalue;
3598 		u32 usbstat;
3599 		dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3600 							(base + 0x00b4);
3601 		dev->llregs = (struct usb338x_ll_regs __iomem *)
3602 							(base + 0x0700);
3603 		dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
3604 							(base + 0x0748);
3605 		dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
3606 							(base + 0x077c);
3607 		dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
3608 							(base + 0x079c);
3609 		dev->plregs = (struct usb338x_pl_regs __iomem *)
3610 							(base + 0x0800);
3611 		usbstat = readl(&dev->usb->usbstat);
3612 		dev->enhanced_mode = !!(usbstat & BIT(11));
3613 		dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3614 		/* put into initial config, link up all endpoints */
3615 		fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3616 					(0xf << DEFECT7374_FSM_FIELD);
3617 		/* See if firmware needs to set up for workaround: */
3618 		if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3619 			dev->bug7734_patched = 1;
3620 			writel(0, &dev->usb->usbctl);
3621 		} else
3622 			dev->bug7734_patched = 0;
3623 	} else {
3624 		dev->enhanced_mode = 0;
3625 		dev->n_ep = 7;
3626 		/* put into initial config, link up all endpoints */
3627 		writel(0, &dev->usb->usbctl);
3628 	}
3629 
3630 	usb_reset(dev);
3631 	usb_reinit(dev);
3632 
3633 	/* irq setup after old hardware is cleaned up */
3634 	if (!pdev->irq) {
3635 		ep_err(dev, "No IRQ.  Check PCI setup!\n");
3636 		retval = -ENODEV;
3637 		goto done;
3638 	}
3639 
3640 	if (dev->quirks & PLX_SUPERSPEED)
3641 		if (pci_enable_msi(pdev))
3642 			ep_err(dev, "Failed to enable MSI mode\n");
3643 
3644 	if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3645 							driver_name, dev)) {
3646 		ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3647 		retval = -EBUSY;
3648 		goto done;
3649 	}
3650 	dev->got_irq = 1;
3651 
3652 	/* DMA setup */
3653 	/* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
3654 	dev->requests = pci_pool_create("requests", pdev,
3655 		sizeof(struct net2280_dma),
3656 		0 /* no alignment requirements */,
3657 		0 /* or page-crossing issues */);
3658 	if (!dev->requests) {
3659 		ep_dbg(dev, "can't get request pool\n");
3660 		retval = -ENOMEM;
3661 		goto done;
3662 	}
3663 	for (i = 1; i < 5; i++) {
3664 		struct net2280_dma	*td;
3665 
3666 		td = pci_pool_alloc(dev->requests, GFP_KERNEL,
3667 				&dev->ep[i].td_dma);
3668 		if (!td) {
3669 			ep_dbg(dev, "can't get dummy %d\n", i);
3670 			retval = -ENOMEM;
3671 			goto done;
3672 		}
3673 		td->dmacount = 0;	/* not VALID */
3674 		td->dmadesc = td->dmaaddr;
3675 		dev->ep[i].dummy = td;
3676 	}
3677 
3678 	/* enable lower-overhead pci memory bursts during DMA */
3679 	if (dev->quirks & PLX_LEGACY)
3680 		writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3681 			/*
3682 			 * 256 write retries may not be enough...
3683 			   BIT(PCI_RETRY_ABORT_ENABLE) |
3684 			*/
3685 			BIT(DMA_READ_MULTIPLE_ENABLE) |
3686 			BIT(DMA_READ_LINE_ENABLE),
3687 			&dev->pci->pcimstctl);
3688 	/* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3689 	pci_set_master(pdev);
3690 	pci_try_set_mwi(pdev);
3691 
3692 	/* ... also flushes any posted pci writes */
3693 	dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3694 
3695 	/* done */
3696 	ep_info(dev, "%s\n", driver_desc);
3697 	ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3698 			pdev->irq, base, dev->chiprev);
3699 	ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3700 		dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3701 	retval = device_create_file(&pdev->dev, &dev_attr_registers);
3702 	if (retval)
3703 		goto done;
3704 
3705 	retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
3706 			gadget_release);
3707 	if (retval)
3708 		goto done;
3709 	return 0;
3710 
3711 done:
3712 	if (dev)
3713 		net2280_remove(pdev);
3714 	return retval;
3715 }
3716 
3717 /* make sure the board is quiescent; otherwise it will continue
3718  * generating IRQs across the upcoming reboot.
3719  */
3720 
3721 static void net2280_shutdown(struct pci_dev *pdev)
3722 {
3723 	struct net2280		*dev = pci_get_drvdata(pdev);
3724 
3725 	/* disable IRQs */
3726 	writel(0, &dev->regs->pciirqenb0);
3727 	writel(0, &dev->regs->pciirqenb1);
3728 
3729 	/* disable the pullup so the host will think we're gone */
3730 	writel(0, &dev->usb->usbctl);
3731 
3732 }
3733 
3734 
3735 /*-------------------------------------------------------------------------*/
3736 
3737 static const struct pci_device_id pci_ids[] = { {
3738 	.class =	((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3739 	.class_mask =	~0,
3740 	.vendor =	PCI_VENDOR_ID_PLX_LEGACY,
3741 	.device =	0x2280,
3742 	.subvendor =	PCI_ANY_ID,
3743 	.subdevice =	PCI_ANY_ID,
3744 	.driver_data =	PLX_LEGACY | PLX_2280,
3745 	}, {
3746 	.class =	((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3747 	.class_mask =	~0,
3748 	.vendor =	PCI_VENDOR_ID_PLX_LEGACY,
3749 	.device =	0x2282,
3750 	.subvendor =	PCI_ANY_ID,
3751 	.subdevice =	PCI_ANY_ID,
3752 	.driver_data =	PLX_LEGACY,
3753 	},
3754 	{
3755 	.class =	((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3756 	.class_mask =	~0,
3757 	.vendor =	PCI_VENDOR_ID_PLX,
3758 	.device =	0x3380,
3759 	.subvendor =	PCI_ANY_ID,
3760 	.subdevice =	PCI_ANY_ID,
3761 	.driver_data =	PLX_SUPERSPEED,
3762 	 },
3763 	{
3764 	.class =	((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3765 	.class_mask =	~0,
3766 	.vendor =	PCI_VENDOR_ID_PLX,
3767 	.device =	0x3382,
3768 	.subvendor =	PCI_ANY_ID,
3769 	.subdevice =	PCI_ANY_ID,
3770 	.driver_data =	PLX_SUPERSPEED,
3771 	 },
3772 { /* end: all zeroes */ }
3773 };
3774 MODULE_DEVICE_TABLE(pci, pci_ids);
3775 
3776 /* pci driver glue; this is a "new style" PCI driver module */
3777 static struct pci_driver net2280_pci_driver = {
3778 	.name =		(char *) driver_name,
3779 	.id_table =	pci_ids,
3780 
3781 	.probe =	net2280_probe,
3782 	.remove =	net2280_remove,
3783 	.shutdown =	net2280_shutdown,
3784 
3785 	/* FIXME add power management support */
3786 };
3787 
3788 module_pci_driver(net2280_pci_driver);
3789 
3790 MODULE_DESCRIPTION(DRIVER_DESC);
3791 MODULE_AUTHOR("David Brownell");
3792 MODULE_LICENSE("GPL");
3793