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Linux 4.16.11
[linux/fpc-iii.git] / drivers / usb / gadget / udc / net2280.c
blob318246d8b2e2b574178acc9745e7d48602742485
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Driver for the PLX NET2280 USB device controller.
4 * Specs and errata are available from <http://www.plxtech.com>.
5 *
6 * PLX Technology Inc. (formerly NetChip Technology) supported the
7 * development of this driver.
8 *
9 *
10 * CODE STATUS HIGHLIGHTS
11 *
12 * This driver should work well with most "gadget" drivers, including
13 * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
14 * as well as Gadget Zero and Gadgetfs.
15 *
16 * DMA is enabled by default.
17 *
18 * MSI is enabled by default. The legacy IRQ is used if MSI couldn't
19 * be enabled.
20 *
21 * Note that almost all the errata workarounds here are only needed for
22 * rev1 chips. Rev1a silicon (0110) fixes almost all of them.
23 */
24
25 /*
26 * Copyright (C) 2003 David Brownell
27 * Copyright (C) 2003-2005 PLX Technology, Inc.
28 * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
29 *
30 * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
31 * with 2282 chip
32 *
33 * Modified Ricardo Ribalda Qtechnology AS to provide compatibility
34 * with usb 338x chip. Based on PLX driver
35 */
36
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/kernel.h>
41 #include <linux/delay.h>
42 #include <linux/ioport.h>
43 #include <linux/slab.h>
44 #include <linux/errno.h>
45 #include <linux/init.h>
46 #include <linux/timer.h>
47 #include <linux/list.h>
48 #include <linux/interrupt.h>
49 #include <linux/moduleparam.h>
50 #include <linux/device.h>
51 #include <linux/usb/ch9.h>
52 #include <linux/usb/gadget.h>
53 #include <linux/prefetch.h>
54 #include <linux/io.h>
55
56 #include <asm/byteorder.h>
57 #include <asm/irq.h>
58 #include <asm/unaligned.h>
59
60 #define DRIVER_DESC "PLX NET228x/USB338x USB Peripheral Controller"
61 #define DRIVER_VERSION "2005 Sept 27/v3.0"
62
63 #define EP_DONTUSE 13 /* nonzero */
64
65 #define USE_RDK_LEDS /* GPIO pins control three LEDs */
66
67
68 static const char driver_name[] = "net2280";
69 static const char driver_desc[] = DRIVER_DESC;
70
71 static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
72 static const char ep0name[] = "ep0";
73
74 #define EP_INFO(_name, _caps) \
75 { \
76 .name = _name, \
77 .caps = _caps, \
78 }
79
80 static const struct {
81 const char *name;
82 const struct usb_ep_caps caps;
83 } ep_info_dft[] = { /* Default endpoint configuration */
84 EP_INFO(ep0name,
85 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
86 EP_INFO("ep-a",
87 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
88 EP_INFO("ep-b",
89 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
90 EP_INFO("ep-c",
91 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
92 EP_INFO("ep-d",
93 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
94 EP_INFO("ep-e",
95 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
96 EP_INFO("ep-f",
97 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
98 EP_INFO("ep-g",
99 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
100 EP_INFO("ep-h",
101 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
102 }, ep_info_adv[] = { /* Endpoints for usb3380 advance mode */
103 EP_INFO(ep0name,
104 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
105 EP_INFO("ep1in",
106 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
107 EP_INFO("ep2out",
108 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
109 EP_INFO("ep3in",
110 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
111 EP_INFO("ep4out",
112 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
113 EP_INFO("ep1out",
114 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
115 EP_INFO("ep2in",
116 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
117 EP_INFO("ep3out",
118 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
119 EP_INFO("ep4in",
120 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
121 };
122
123 #undef EP_INFO
124
125 /* mode 0 == ep-{a,b,c,d} 1K fifo each
126 * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
127 * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
128 */
129 static ushort fifo_mode;
130
131 /* "modprobe net2280 fifo_mode=1" etc */
132 module_param(fifo_mode, ushort, 0644);
133
134 /* enable_suspend -- When enabled, the driver will respond to
135 * USB suspend requests by powering down the NET2280. Otherwise,
136 * USB suspend requests will be ignored. This is acceptable for
137 * self-powered devices
138 */
139 static bool enable_suspend;
140
141 /* "modprobe net2280 enable_suspend=1" etc */
142 module_param(enable_suspend, bool, 0444);
143
144 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
145
146 static char *type_string(u8 bmAttributes)
147 {
148 switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
149 case USB_ENDPOINT_XFER_BULK: return "bulk";
150 case USB_ENDPOINT_XFER_ISOC: return "iso";
151 case USB_ENDPOINT_XFER_INT: return "intr";
152 }
153 return "control";
154 }
155
156 #include "net2280.h"
157
158 #define valid_bit cpu_to_le32(BIT(VALID_BIT))
159 #define dma_done_ie cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
160
161 static void ep_clear_seqnum(struct net2280_ep *ep);
162 static void stop_activity(struct net2280 *dev,
163 struct usb_gadget_driver *driver);
164 static void ep0_start(struct net2280 *dev);
165
166 /*-------------------------------------------------------------------------*/
167 static inline void enable_pciirqenb(struct net2280_ep *ep)
168 {
169 u32 tmp = readl(&ep->dev->regs->pciirqenb0);
170
171 if (ep->dev->quirks & PLX_LEGACY)
172 tmp |= BIT(ep->num);
173 else
174 tmp |= BIT(ep_bit[ep->num]);
175 writel(tmp, &ep->dev->regs->pciirqenb0);
176
177 return;
178 }
179
180 static int
181 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
182 {
183 struct net2280 *dev;
184 struct net2280_ep *ep;
185 u32 max;
186 u32 tmp = 0;
187 u32 type;
188 unsigned long flags;
189 static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
190 int ret = 0;
191
192 ep = container_of(_ep, struct net2280_ep, ep);
193 if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
194 desc->bDescriptorType != USB_DT_ENDPOINT) {
195 pr_err("%s: failed at line=%d\n", __func__, __LINE__);
196 return -EINVAL;
197 }
198 dev = ep->dev;
199 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
200 ret = -ESHUTDOWN;
201 goto print_err;
202 }
203
204 /* erratum 0119 workaround ties up an endpoint number */
205 if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
206 ret = -EDOM;
207 goto print_err;
208 }
209
210 if (dev->quirks & PLX_PCIE) {
211 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
212 ret = -EDOM;
213 goto print_err;
214 }
215 ep->is_in = !!usb_endpoint_dir_in(desc);
216 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
217 ret = -EINVAL;
218 goto print_err;
219 }
220 }
221
222 /* sanity check ep-e/ep-f since their fifos are small */
223 max = usb_endpoint_maxp(desc);
224 if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
225 ret = -ERANGE;
226 goto print_err;
227 }
228
229 spin_lock_irqsave(&dev->lock, flags);
230 _ep->maxpacket = max;
231 ep->desc = desc;
232
233 /* ep_reset() has already been called */
234 ep->stopped = 0;
235 ep->wedged = 0;
236 ep->out_overflow = 0;
237
238 /* set speed-dependent max packet; may kick in high bandwidth */
239 set_max_speed(ep, max);
240
241 /* set type, direction, address; reset fifo counters */
242 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
243
244 if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
245 tmp = readl(&ep->cfg->ep_cfg);
246 /* If USB ep number doesn't match hardware ep number */
247 if ((tmp & 0xf) != usb_endpoint_num(desc)) {
248 ret = -EINVAL;
249 spin_unlock_irqrestore(&dev->lock, flags);
250 goto print_err;
251 }
252 if (ep->is_in)
253 tmp &= ~USB3380_EP_CFG_MASK_IN;
254 else
255 tmp &= ~USB3380_EP_CFG_MASK_OUT;
256 }
257 type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
258 if (type == USB_ENDPOINT_XFER_INT) {
259 /* erratum 0105 workaround prevents hs NYET */
260 if (dev->chiprev == 0100 &&
261 dev->gadget.speed == USB_SPEED_HIGH &&
262 !(desc->bEndpointAddress & USB_DIR_IN))
263 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
264 &ep->regs->ep_rsp);
265 } else if (type == USB_ENDPOINT_XFER_BULK) {
266 /* catch some particularly blatant driver bugs */
267 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
268 (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
269 (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
270 spin_unlock_irqrestore(&dev->lock, flags);
271 ret = -ERANGE;
272 goto print_err;
273 }
274 }
275 ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
276 /* Enable this endpoint */
277 if (dev->quirks & PLX_LEGACY) {
278 tmp |= type << ENDPOINT_TYPE;
279 tmp |= desc->bEndpointAddress;
280 /* default full fifo lines */
281 tmp |= (4 << ENDPOINT_BYTE_COUNT);
282 tmp |= BIT(ENDPOINT_ENABLE);
283 ep->is_in = (tmp & USB_DIR_IN) != 0;
284 } else {
285 /* In Legacy mode, only OUT endpoints are used */
286 if (dev->enhanced_mode && ep->is_in) {
287 tmp |= type << IN_ENDPOINT_TYPE;
288 tmp |= BIT(IN_ENDPOINT_ENABLE);
289 } else {
290 tmp |= type << OUT_ENDPOINT_TYPE;
291 tmp |= BIT(OUT_ENDPOINT_ENABLE);
292 tmp |= (ep->is_in << ENDPOINT_DIRECTION);
293 }
294
295 tmp |= (4 << ENDPOINT_BYTE_COUNT);
296 if (!dev->enhanced_mode)
297 tmp |= usb_endpoint_num(desc);
298 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
299 }
300
301 /* Make sure all the registers are written before ep_rsp*/
302 wmb();
303
304 /* for OUT transfers, block the rx fifo until a read is posted */
305 if (!ep->is_in)
306 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
307 else if (!(dev->quirks & PLX_2280)) {
308 /* Added for 2282, Don't use nak packets on an in endpoint,
309 * this was ignored on 2280
310 */
311 writel(BIT(CLEAR_NAK_OUT_PACKETS) |
312 BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
313 }
314
315 if (dev->quirks & PLX_PCIE)
316 ep_clear_seqnum(ep);
317 writel(tmp, &ep->cfg->ep_cfg);
318
319 /* enable irqs */
320 if (!ep->dma) { /* pio, per-packet */
321 enable_pciirqenb(ep);
322
323 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
324 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
325 if (dev->quirks & PLX_2280)
326 tmp |= readl(&ep->regs->ep_irqenb);
327 writel(tmp, &ep->regs->ep_irqenb);
328 } else { /* dma, per-request */
329 tmp = BIT((8 + ep->num)); /* completion */
330 tmp |= readl(&dev->regs->pciirqenb1);
331 writel(tmp, &dev->regs->pciirqenb1);
332
333 /* for short OUT transfers, dma completions can't
334 * advance the queue; do it pio-style, by hand.
335 * NOTE erratum 0112 workaround #2
336 */
337 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
338 tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
339 writel(tmp, &ep->regs->ep_irqenb);
340
341 enable_pciirqenb(ep);
342 }
343 }
344
345 tmp = desc->bEndpointAddress;
346 ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
347 _ep->name, tmp & 0x0f, DIR_STRING(tmp),
348 type_string(desc->bmAttributes),
349 ep->dma ? "dma" : "pio", max);
350
351 /* pci writes may still be posted */
352 spin_unlock_irqrestore(&dev->lock, flags);
353 return ret;
354
355 print_err:
356 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
357 return ret;
358 }
359
360 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
361 {
362 u32 result;
363
364 do {
365 result = readl(ptr);
366 if (result == ~(u32)0) /* "device unplugged" */
367 return -ENODEV;
368 result &= mask;
369 if (result == done)
370 return 0;
371 udelay(1);
372 usec--;
373 } while (usec > 0);
374 return -ETIMEDOUT;
375 }
376
377 static const struct usb_ep_ops net2280_ep_ops;
378
379 static void ep_reset_228x(struct net2280_regs __iomem *regs,
380 struct net2280_ep *ep)
381 {
382 u32 tmp;
383
384 ep->desc = NULL;
385 INIT_LIST_HEAD(&ep->queue);
386
387 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
388 ep->ep.ops = &net2280_ep_ops;
389
390 /* disable the dma, irqs, endpoint... */
391 if (ep->dma) {
392 writel(0, &ep->dma->dmactl);
393 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
394 BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
395 BIT(DMA_ABORT),
396 &ep->dma->dmastat);
397
398 tmp = readl(&regs->pciirqenb0);
399 tmp &= ~BIT(ep->num);
400 writel(tmp, &regs->pciirqenb0);
401 } else {
402 tmp = readl(&regs->pciirqenb1);
403 tmp &= ~BIT((8 + ep->num)); /* completion */
404 writel(tmp, &regs->pciirqenb1);
405 }
406 writel(0, &ep->regs->ep_irqenb);
407
408 /* init to our chosen defaults, notably so that we NAK OUT
409 * packets until the driver queues a read (+note erratum 0112)
410 */
411 if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
412 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
413 BIT(SET_NAK_OUT_PACKETS) |
414 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
415 BIT(CLEAR_INTERRUPT_MODE);
416 } else {
417 /* added for 2282 */
418 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
419 BIT(CLEAR_NAK_OUT_PACKETS) |
420 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
421 BIT(CLEAR_INTERRUPT_MODE);
422 }
423
424 if (ep->num != 0) {
425 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
426 BIT(CLEAR_ENDPOINT_HALT);
427 }
428 writel(tmp, &ep->regs->ep_rsp);
429
430 /* scrub most status bits, and flush any fifo state */
431 if (ep->dev->quirks & PLX_2280)
432 tmp = BIT(FIFO_OVERFLOW) |
433 BIT(FIFO_UNDERFLOW);
434 else
435 tmp = 0;
436
437 writel(tmp | BIT(TIMEOUT) |
438 BIT(USB_STALL_SENT) |
439 BIT(USB_IN_NAK_SENT) |
440 BIT(USB_IN_ACK_RCVD) |
441 BIT(USB_OUT_PING_NAK_SENT) |
442 BIT(USB_OUT_ACK_SENT) |
443 BIT(FIFO_FLUSH) |
444 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
445 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
446 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
447 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
448 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
449 BIT(DATA_IN_TOKEN_INTERRUPT),
450 &ep->regs->ep_stat);
451
452 /* fifo size is handled separately */
453 }
454
455 static void ep_reset_338x(struct net2280_regs __iomem *regs,
456 struct net2280_ep *ep)
457 {
458 u32 tmp, dmastat;
459
460 ep->desc = NULL;
461 INIT_LIST_HEAD(&ep->queue);
462
463 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
464 ep->ep.ops = &net2280_ep_ops;
465
466 /* disable the dma, irqs, endpoint... */
467 if (ep->dma) {
468 writel(0, &ep->dma->dmactl);
469 writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
470 BIT(DMA_PAUSE_DONE_INTERRUPT) |
471 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
472 BIT(DMA_TRANSACTION_DONE_INTERRUPT),
473 /* | BIT(DMA_ABORT), */
474 &ep->dma->dmastat);
475
476 dmastat = readl(&ep->dma->dmastat);
477 if (dmastat == 0x5002) {
478 ep_warn(ep->dev, "The dmastat return = %x!!\n",
479 dmastat);
480 writel(0x5a, &ep->dma->dmastat);
481 }
482
483 tmp = readl(&regs->pciirqenb0);
484 tmp &= ~BIT(ep_bit[ep->num]);
485 writel(tmp, &regs->pciirqenb0);
486 } else {
487 if (ep->num < 5) {
488 tmp = readl(&regs->pciirqenb1);
489 tmp &= ~BIT((8 + ep->num)); /* completion */
490 writel(tmp, &regs->pciirqenb1);
491 }
492 }
493 writel(0, &ep->regs->ep_irqenb);
494
495 writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
496 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
497 BIT(FIFO_OVERFLOW) |
498 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
499 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
500 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
501 BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
502
503 tmp = readl(&ep->cfg->ep_cfg);
504 if (ep->is_in)
505 tmp &= ~USB3380_EP_CFG_MASK_IN;
506 else
507 tmp &= ~USB3380_EP_CFG_MASK_OUT;
508 writel(tmp, &ep->cfg->ep_cfg);
509 }
510
511 static void nuke(struct net2280_ep *);
512
513 static int net2280_disable(struct usb_ep *_ep)
514 {
515 struct net2280_ep *ep;
516 unsigned long flags;
517
518 ep = container_of(_ep, struct net2280_ep, ep);
519 if (!_ep || !ep->desc || _ep->name == ep0name) {
520 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
521 return -EINVAL;
522 }
523 spin_lock_irqsave(&ep->dev->lock, flags);
524 nuke(ep);
525
526 if (ep->dev->quirks & PLX_PCIE)
527 ep_reset_338x(ep->dev->regs, ep);
528 else
529 ep_reset_228x(ep->dev->regs, ep);
530
531 ep_vdbg(ep->dev, "disabled %s %s\n",
532 ep->dma ? "dma" : "pio", _ep->name);
533
534 /* synch memory views with the device */
535 (void)readl(&ep->cfg->ep_cfg);
536
537 if (!ep->dma && ep->num >= 1 && ep->num <= 4)
538 ep->dma = &ep->dev->dma[ep->num - 1];
539
540 spin_unlock_irqrestore(&ep->dev->lock, flags);
541 return 0;
542 }
543
544 /*-------------------------------------------------------------------------*/
545
546 static struct usb_request
547 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
548 {
549 struct net2280_ep *ep;
550 struct net2280_request *req;
551
552 if (!_ep) {
553 pr_err("%s: Invalid ep\n", __func__);
554 return NULL;
555 }
556 ep = container_of(_ep, struct net2280_ep, ep);
557
558 req = kzalloc(sizeof(*req), gfp_flags);
559 if (!req)
560 return NULL;
561
562 INIT_LIST_HEAD(&req->queue);
563
564 /* this dma descriptor may be swapped with the previous dummy */
565 if (ep->dma) {
566 struct net2280_dma *td;
567
568 td = dma_pool_alloc(ep->dev->requests, gfp_flags,
569 &req->td_dma);
570 if (!td) {
571 kfree(req);
572 return NULL;
573 }
574 td->dmacount = 0; /* not VALID */
575 td->dmadesc = td->dmaaddr;
576 req->td = td;
577 }
578 return &req->req;
579 }
580
581 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
582 {
583 struct net2280_ep *ep;
584 struct net2280_request *req;
585
586 ep = container_of(_ep, struct net2280_ep, ep);
587 if (!_ep || !_req) {
588 dev_err(&ep->dev->pdev->dev, "%s: Invalid ep=%p or req=%p\n",
589 __func__, _ep, _req);
590 return;
591 }
592
593 req = container_of(_req, struct net2280_request, req);
594 WARN_ON(!list_empty(&req->queue));
595 if (req->td)
596 dma_pool_free(ep->dev->requests, req->td, req->td_dma);
597 kfree(req);
598 }
599
600 /*-------------------------------------------------------------------------*/
601
602 /* load a packet into the fifo we use for usb IN transfers.
603 * works for all endpoints.
604 *
605 * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
606 * at a time, but this code is simpler because it knows it only writes
607 * one packet. ep-a..ep-d should use dma instead.
608 */
609 static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
610 {
611 struct net2280_ep_regs __iomem *regs = ep->regs;
612 u8 *buf;
613 u32 tmp;
614 unsigned count, total;
615
616 /* INVARIANT: fifo is currently empty. (testable) */
617
618 if (req) {
619 buf = req->buf + req->actual;
620 prefetch(buf);
621 total = req->length - req->actual;
622 } else {
623 total = 0;
624 buf = NULL;
625 }
626
627 /* write just one packet at a time */
628 count = ep->ep.maxpacket;
629 if (count > total) /* min() cannot be used on a bitfield */
630 count = total;
631
632 ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
633 ep->ep.name, count,
634 (count != ep->ep.maxpacket) ? " (short)" : "",
635 req);
636 while (count >= 4) {
637 /* NOTE be careful if you try to align these. fifo lines
638 * should normally be full (4 bytes) and successive partial
639 * lines are ok only in certain cases.
640 */
641 tmp = get_unaligned((u32 *)buf);
642 cpu_to_le32s(&tmp);
643 writel(tmp, &regs->ep_data);
644 buf += 4;
645 count -= 4;
646 }
647
648 /* last fifo entry is "short" unless we wrote a full packet.
649 * also explicitly validate last word in (periodic) transfers
650 * when maxpacket is not a multiple of 4 bytes.
651 */
652 if (count || total < ep->ep.maxpacket) {
653 tmp = count ? get_unaligned((u32 *)buf) : count;
654 cpu_to_le32s(&tmp);
655 set_fifo_bytecount(ep, count & 0x03);
656 writel(tmp, &regs->ep_data);
657 }
658
659 /* pci writes may still be posted */
660 }
661
662 /* work around erratum 0106: PCI and USB race over the OUT fifo.
663 * caller guarantees chiprev 0100, out endpoint is NAKing, and
664 * there's no real data in the fifo.
665 *
666 * NOTE: also used in cases where that erratum doesn't apply:
667 * where the host wrote "too much" data to us.
668 */
669 static void out_flush(struct net2280_ep *ep)
670 {
671 u32 __iomem *statp;
672 u32 tmp;
673
674 statp = &ep->regs->ep_stat;
675
676 tmp = readl(statp);
677 if (tmp & BIT(NAK_OUT_PACKETS)) {
678 ep_dbg(ep->dev, "%s %s %08x !NAK\n",
679 ep->ep.name, __func__, tmp);
680 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
681 }
682
683 writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
684 BIT(DATA_PACKET_RECEIVED_INTERRUPT),
685 statp);
686 writel(BIT(FIFO_FLUSH), statp);
687 /* Make sure that stap is written */
688 mb();
689 tmp = readl(statp);
690 if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
691 /* high speed did bulk NYET; fifo isn't filling */
692 ep->dev->gadget.speed == USB_SPEED_FULL) {
693 unsigned usec;
694
695 usec = 50; /* 64 byte bulk/interrupt */
696 handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
697 BIT(USB_OUT_PING_NAK_SENT), usec);
698 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
699 }
700 }
701
702 /* unload packet(s) from the fifo we use for usb OUT transfers.
703 * returns true iff the request completed, because of short packet
704 * or the request buffer having filled with full packets.
705 *
706 * for ep-a..ep-d this will read multiple packets out when they
707 * have been accepted.
708 */
709 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
710 {
711 struct net2280_ep_regs __iomem *regs = ep->regs;
712 u8 *buf = req->req.buf + req->req.actual;
713 unsigned count, tmp, is_short;
714 unsigned cleanup = 0, prevent = 0;
715
716 /* erratum 0106 ... packets coming in during fifo reads might
717 * be incompletely rejected. not all cases have workarounds.
718 */
719 if (ep->dev->chiprev == 0x0100 &&
720 ep->dev->gadget.speed == USB_SPEED_FULL) {
721 udelay(1);
722 tmp = readl(&ep->regs->ep_stat);
723 if ((tmp & BIT(NAK_OUT_PACKETS)))
724 cleanup = 1;
725 else if ((tmp & BIT(FIFO_FULL))) {
726 start_out_naking(ep);
727 prevent = 1;
728 }
729 /* else: hope we don't see the problem */
730 }
731
732 /* never overflow the rx buffer. the fifo reads packets until
733 * it sees a short one; we might not be ready for them all.
734 */
735 prefetchw(buf);
736 count = readl(&regs->ep_avail);
737 if (unlikely(count == 0)) {
738 udelay(1);
739 tmp = readl(&ep->regs->ep_stat);
740 count = readl(&regs->ep_avail);
741 /* handled that data already? */
742 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
743 return 0;
744 }
745
746 tmp = req->req.length - req->req.actual;
747 if (count > tmp) {
748 /* as with DMA, data overflow gets flushed */
749 if ((tmp % ep->ep.maxpacket) != 0) {
750 ep_err(ep->dev,
751 "%s out fifo %d bytes, expected %d\n",
752 ep->ep.name, count, tmp);
753 req->req.status = -EOVERFLOW;
754 cleanup = 1;
755 /* NAK_OUT_PACKETS will be set, so flushing is safe;
756 * the next read will start with the next packet
757 */
758 } /* else it's a ZLP, no worries */
759 count = tmp;
760 }
761 req->req.actual += count;
762
763 is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
764
765 ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
766 ep->ep.name, count, is_short ? " (short)" : "",
767 cleanup ? " flush" : "", prevent ? " nak" : "",
768 req, req->req.actual, req->req.length);
769
770 while (count >= 4) {
771 tmp = readl(&regs->ep_data);
772 cpu_to_le32s(&tmp);
773 put_unaligned(tmp, (u32 *)buf);
774 buf += 4;
775 count -= 4;
776 }
777 if (count) {
778 tmp = readl(&regs->ep_data);
779 /* LE conversion is implicit here: */
780 do {
781 *buf++ = (u8) tmp;
782 tmp >>= 8;
783 } while (--count);
784 }
785 if (cleanup)
786 out_flush(ep);
787 if (prevent) {
788 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
789 (void) readl(&ep->regs->ep_rsp);
790 }
791
792 return is_short || ((req->req.actual == req->req.length) &&
793 !req->req.zero);
794 }
795
796 /* fill out dma descriptor to match a given request */
797 static void fill_dma_desc(struct net2280_ep *ep,
798 struct net2280_request *req, int valid)
799 {
800 struct net2280_dma *td = req->td;
801 u32 dmacount = req->req.length;
802
803 /* don't let DMA continue after a short OUT packet,
804 * so overruns can't affect the next transfer.
805 * in case of overruns on max-size packets, we can't
806 * stop the fifo from filling but we can flush it.
807 */
808 if (ep->is_in)
809 dmacount |= BIT(DMA_DIRECTION);
810 if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
811 !(ep->dev->quirks & PLX_2280))
812 dmacount |= BIT(END_OF_CHAIN);
813
814 req->valid = valid;
815 if (valid)
816 dmacount |= BIT(VALID_BIT);
817 dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
818
819 /* td->dmadesc = previously set by caller */
820 td->dmaaddr = cpu_to_le32 (req->req.dma);
821
822 /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
823 wmb();
824 td->dmacount = cpu_to_le32(dmacount);
825 }
826
827 static const u32 dmactl_default =
828 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
829 BIT(DMA_CLEAR_COUNT_ENABLE) |
830 /* erratum 0116 workaround part 1 (use POLLING) */
831 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
832 BIT(DMA_VALID_BIT_POLLING_ENABLE) |
833 BIT(DMA_VALID_BIT_ENABLE) |
834 BIT(DMA_SCATTER_GATHER_ENABLE) |
835 /* erratum 0116 workaround part 2 (no AUTOSTART) */
836 BIT(DMA_ENABLE);
837
838 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
839 {
840 handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
841 }
842
843 static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
844 {
845 writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
846 spin_stop_dma(dma);
847 }
848
849 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
850 {
851 struct net2280_dma_regs __iomem *dma = ep->dma;
852 unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
853
854 if (!(ep->dev->quirks & PLX_2280))
855 tmp |= BIT(END_OF_CHAIN);
856
857 writel(tmp, &dma->dmacount);
858 writel(readl(&dma->dmastat), &dma->dmastat);
859
860 writel(td_dma, &dma->dmadesc);
861 if (ep->dev->quirks & PLX_PCIE)
862 dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
863 writel(dmactl, &dma->dmactl);
864
865 /* erratum 0116 workaround part 3: pci arbiter away from net2280 */
866 (void) readl(&ep->dev->pci->pcimstctl);
867
868 writel(BIT(DMA_START), &dma->dmastat);
869
870 if (!ep->is_in)
871 stop_out_naking(ep);
872 }
873
874 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
875 {
876 u32 tmp;
877 struct net2280_dma_regs __iomem *dma = ep->dma;
878
879 /* FIXME can't use DMA for ZLPs */
880
881 /* on this path we "know" there's no dma active (yet) */
882 WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
883 writel(0, &ep->dma->dmactl);
884
885 /* previous OUT packet might have been short */
886 if (!ep->is_in && (readl(&ep->regs->ep_stat) &
887 BIT(NAK_OUT_PACKETS))) {
888 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
889 &ep->regs->ep_stat);
890
891 tmp = readl(&ep->regs->ep_avail);
892 if (tmp) {
893 writel(readl(&dma->dmastat), &dma->dmastat);
894
895 /* transfer all/some fifo data */
896 writel(req->req.dma, &dma->dmaaddr);
897 tmp = min(tmp, req->req.length);
898
899 /* dma irq, faking scatterlist status */
900 req->td->dmacount = cpu_to_le32(req->req.length - tmp);
901 writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
902 &dma->dmacount);
903 req->td->dmadesc = 0;
904 req->valid = 1;
905
906 writel(BIT(DMA_ENABLE), &dma->dmactl);
907 writel(BIT(DMA_START), &dma->dmastat);
908 return;
909 }
910 }
911
912 tmp = dmactl_default;
913
914 /* force packet boundaries between dma requests, but prevent the
915 * controller from automagically writing a last "short" packet
916 * (zero length) unless the driver explicitly said to do that.
917 */
918 if (ep->is_in) {
919 if (likely((req->req.length % ep->ep.maxpacket) ||
920 req->req.zero)){
921 tmp |= BIT(DMA_FIFO_VALIDATE);
922 ep->in_fifo_validate = 1;
923 } else
924 ep->in_fifo_validate = 0;
925 }
926
927 /* init req->td, pointing to the current dummy */
928 req->td->dmadesc = cpu_to_le32 (ep->td_dma);
929 fill_dma_desc(ep, req, 1);
930
931 req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
932
933 start_queue(ep, tmp, req->td_dma);
934 }
935
936 static inline void
937 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
938 {
939 struct net2280_dma *end;
940 dma_addr_t tmp;
941
942 /* swap new dummy for old, link; fill and maybe activate */
943 end = ep->dummy;
944 ep->dummy = req->td;
945 req->td = end;
946
947 tmp = ep->td_dma;
948 ep->td_dma = req->td_dma;
949 req->td_dma = tmp;
950
951 end->dmadesc = cpu_to_le32 (ep->td_dma);
952
953 fill_dma_desc(ep, req, valid);
954 }
955
956 static void
957 done(struct net2280_ep *ep, struct net2280_request *req, int status)
958 {
959 struct net2280 *dev;
960 unsigned stopped = ep->stopped;
961
962 list_del_init(&req->queue);
963
964 if (req->req.status == -EINPROGRESS)
965 req->req.status = status;
966 else
967 status = req->req.status;
968
969 dev = ep->dev;
970 if (ep->dma)
971 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
972
973 if (status && status != -ESHUTDOWN)
974 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
975 ep->ep.name, &req->req, status,
976 req->req.actual, req->req.length);
977
978 /* don't modify queue heads during completion callback */
979 ep->stopped = 1;
980 spin_unlock(&dev->lock);
981 usb_gadget_giveback_request(&ep->ep, &req->req);
982 spin_lock(&dev->lock);
983 ep->stopped = stopped;
984 }
985
986 /*-------------------------------------------------------------------------*/
987
988 static int
989 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
990 {
991 struct net2280_request *req;
992 struct net2280_ep *ep;
993 struct net2280 *dev;
994 unsigned long flags;
995 int ret = 0;
996
997 /* we always require a cpu-view buffer, so that we can
998 * always use pio (as fallback or whatever).
999 */
1000 ep = container_of(_ep, struct net2280_ep, ep);
1001 if (!_ep || (!ep->desc && ep->num != 0)) {
1002 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1003 return -EINVAL;
1004 }
1005 req = container_of(_req, struct net2280_request, req);
1006 if (!_req || !_req->complete || !_req->buf ||
1007 !list_empty(&req->queue)) {
1008 ret = -EINVAL;
1009 goto print_err;
1010 }
1011 if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1012 ret = -EDOM;
1013 goto print_err;
1014 }
1015 dev = ep->dev;
1016 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1017 ret = -ESHUTDOWN;
1018 goto print_err;
1019 }
1020
1021 /* FIXME implement PIO fallback for ZLPs with DMA */
1022 if (ep->dma && _req->length == 0) {
1023 ret = -EOPNOTSUPP;
1024 goto print_err;
1025 }
1026
1027 /* set up dma mapping in case the caller didn't */
1028 if (ep->dma) {
1029 ret = usb_gadget_map_request(&dev->gadget, _req,
1030 ep->is_in);
1031 if (ret)
1032 goto print_err;
1033 }
1034
1035 ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1036 _ep->name, _req, _req->length, _req->buf);
1037
1038 spin_lock_irqsave(&dev->lock, flags);
1039
1040 _req->status = -EINPROGRESS;
1041 _req->actual = 0;
1042
1043 /* kickstart this i/o queue? */
1044 if (list_empty(&ep->queue) && !ep->stopped &&
1045 !((dev->quirks & PLX_PCIE) && ep->dma &&
1046 (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1047
1048 /* use DMA if the endpoint supports it, else pio */
1049 if (ep->dma)
1050 start_dma(ep, req);
1051 else {
1052 /* maybe there's no control data, just status ack */
1053 if (ep->num == 0 && _req->length == 0) {
1054 allow_status(ep);
1055 done(ep, req, 0);
1056 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1057 goto done;
1058 }
1059
1060 /* PIO ... stuff the fifo, or unblock it. */
1061 if (ep->is_in)
1062 write_fifo(ep, _req);
1063 else if (list_empty(&ep->queue)) {
1064 u32 s;
1065
1066 /* OUT FIFO might have packet(s) buffered */
1067 s = readl(&ep->regs->ep_stat);
1068 if ((s & BIT(FIFO_EMPTY)) == 0) {
1069 /* note: _req->short_not_ok is
1070 * ignored here since PIO _always_
1071 * stops queue advance here, and
1072 * _req->status doesn't change for
1073 * short reads (only _req->actual)
1074 */
1075 if (read_fifo(ep, req) &&
1076 ep->num == 0) {
1077 done(ep, req, 0);
1078 allow_status(ep);
1079 /* don't queue it */
1080 req = NULL;
1081 } else if (read_fifo(ep, req) &&
1082 ep->num != 0) {
1083 done(ep, req, 0);
1084 req = NULL;
1085 } else
1086 s = readl(&ep->regs->ep_stat);
1087 }
1088
1089 /* don't NAK, let the fifo fill */
1090 if (req && (s & BIT(NAK_OUT_PACKETS)))
1091 writel(BIT(CLEAR_NAK_OUT_PACKETS),
1092 &ep->regs->ep_rsp);
1093 }
1094 }
1095
1096 } else if (ep->dma) {
1097 int valid = 1;
1098
1099 if (ep->is_in) {
1100 int expect;
1101
1102 /* preventing magic zlps is per-engine state, not
1103 * per-transfer; irq logic must recover hiccups.
1104 */
1105 expect = likely(req->req.zero ||
1106 (req->req.length % ep->ep.maxpacket));
1107 if (expect != ep->in_fifo_validate)
1108 valid = 0;
1109 }
1110 queue_dma(ep, req, valid);
1111
1112 } /* else the irq handler advances the queue. */
1113
1114 ep->responded = 1;
1115 if (req)
1116 list_add_tail(&req->queue, &ep->queue);
1117 done:
1118 spin_unlock_irqrestore(&dev->lock, flags);
1119
1120 /* pci writes may still be posted */
1121 return ret;
1122
1123 print_err:
1124 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1125 return ret;
1126 }
1127
1128 static inline void
1129 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1130 int status)
1131 {
1132 req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1133 done(ep, req, status);
1134 }
1135
1136 static int scan_dma_completions(struct net2280_ep *ep)
1137 {
1138 int num_completed = 0;
1139
1140 /* only look at descriptors that were "naturally" retired,
1141 * so fifo and list head state won't matter
1142 */
1143 while (!list_empty(&ep->queue)) {
1144 struct net2280_request *req;
1145 u32 req_dma_count;
1146
1147 req = list_entry(ep->queue.next,
1148 struct net2280_request, queue);
1149 if (!req->valid)
1150 break;
1151 rmb();
1152 req_dma_count = le32_to_cpup(&req->td->dmacount);
1153 if ((req_dma_count & BIT(VALID_BIT)) != 0)
1154 break;
1155
1156 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1157 * cases where DMA must be aborted; this code handles
1158 * all non-abort DMA completions.
1159 */
1160 if (unlikely(req->td->dmadesc == 0)) {
1161 /* paranoia */
1162 u32 const ep_dmacount = readl(&ep->dma->dmacount);
1163
1164 if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1165 break;
1166 /* single transfer mode */
1167 dma_done(ep, req, req_dma_count, 0);
1168 num_completed++;
1169 break;
1170 } else if (!ep->is_in &&
1171 (req->req.length % ep->ep.maxpacket) &&
1172 !(ep->dev->quirks & PLX_PCIE)) {
1173
1174 u32 const ep_stat = 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 ((ep_stat & 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 u32 const ep_avail = readl(&ep->regs->ep_avail);
1185 if (ep_avail) {
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, ep_avail,
1191 req->req.length);
1192 req->req.status = -EOVERFLOW;
1193 }
1194 }
1195 }
1196 dma_done(ep, req, req_dma_count, 0);
1197 num_completed++;
1198 }
1199
1200 return num_completed;
1201 }
1202
1203 static void restart_dma(struct net2280_ep *ep)
1204 {
1205 struct net2280_request *req;
1206
1207 if (ep->stopped)
1208 return;
1209 req = list_entry(ep->queue.next, struct net2280_request, queue);
1210
1211 start_dma(ep, req);
1212 }
1213
1214 static void abort_dma(struct net2280_ep *ep)
1215 {
1216 /* abort the current transfer */
1217 if (likely(!list_empty(&ep->queue))) {
1218 /* FIXME work around errata 0121, 0122, 0124 */
1219 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1220 spin_stop_dma(ep->dma);
1221 } else
1222 stop_dma(ep->dma);
1223 scan_dma_completions(ep);
1224 }
1225
1226 /* dequeue ALL requests */
1227 static void nuke(struct net2280_ep *ep)
1228 {
1229 struct net2280_request *req;
1230
1231 /* called with spinlock held */
1232 ep->stopped = 1;
1233 if (ep->dma)
1234 abort_dma(ep);
1235 while (!list_empty(&ep->queue)) {
1236 req = list_entry(ep->queue.next,
1237 struct net2280_request,
1238 queue);
1239 done(ep, req, -ESHUTDOWN);
1240 }
1241 }
1242
1243 /* dequeue JUST ONE request */
1244 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1245 {
1246 struct net2280_ep *ep;
1247 struct net2280_request *req;
1248 unsigned long flags;
1249 u32 dmactl;
1250 int stopped;
1251
1252 ep = container_of(_ep, struct net2280_ep, ep);
1253 if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1254 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1255 __func__, _ep, _req);
1256 return -EINVAL;
1257 }
1258
1259 spin_lock_irqsave(&ep->dev->lock, flags);
1260 stopped = ep->stopped;
1261
1262 /* quiesce dma while we patch the queue */
1263 dmactl = 0;
1264 ep->stopped = 1;
1265 if (ep->dma) {
1266 dmactl = readl(&ep->dma->dmactl);
1267 /* WARNING erratum 0127 may kick in ... */
1268 stop_dma(ep->dma);
1269 scan_dma_completions(ep);
1270 }
1271
1272 /* make sure it's still queued on this endpoint */
1273 list_for_each_entry(req, &ep->queue, queue) {
1274 if (&req->req == _req)
1275 break;
1276 }
1277 if (&req->req != _req) {
1278 spin_unlock_irqrestore(&ep->dev->lock, flags);
1279 dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
1280 __func__);
1281 return -EINVAL;
1282 }
1283
1284 /* queue head may be partially complete. */
1285 if (ep->queue.next == &req->queue) {
1286 if (ep->dma) {
1287 ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1288 _req->status = -ECONNRESET;
1289 abort_dma(ep);
1290 if (likely(ep->queue.next == &req->queue)) {
1291 /* NOTE: misreports single-transfer mode*/
1292 req->td->dmacount = 0; /* invalidate */
1293 dma_done(ep, req,
1294 readl(&ep->dma->dmacount),
1295 -ECONNRESET);
1296 }
1297 } else {
1298 ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1299 done(ep, req, -ECONNRESET);
1300 }
1301 req = NULL;
1302 }
1303
1304 if (req)
1305 done(ep, req, -ECONNRESET);
1306 ep->stopped = stopped;
1307
1308 if (ep->dma) {
1309 /* turn off dma on inactive queues */
1310 if (list_empty(&ep->queue))
1311 stop_dma(ep->dma);
1312 else if (!ep->stopped) {
1313 /* resume current request, or start new one */
1314 if (req)
1315 writel(dmactl, &ep->dma->dmactl);
1316 else
1317 start_dma(ep, list_entry(ep->queue.next,
1318 struct net2280_request, queue));
1319 }
1320 }
1321
1322 spin_unlock_irqrestore(&ep->dev->lock, flags);
1323 return 0;
1324 }
1325
1326 /*-------------------------------------------------------------------------*/
1327
1328 static int net2280_fifo_status(struct usb_ep *_ep);
1329
1330 static int
1331 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1332 {
1333 struct net2280_ep *ep;
1334 unsigned long flags;
1335 int retval = 0;
1336
1337 ep = container_of(_ep, struct net2280_ep, ep);
1338 if (!_ep || (!ep->desc && ep->num != 0)) {
1339 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1340 return -EINVAL;
1341 }
1342 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1343 retval = -ESHUTDOWN;
1344 goto print_err;
1345 }
1346 if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1347 == USB_ENDPOINT_XFER_ISOC) {
1348 retval = -EINVAL;
1349 goto print_err;
1350 }
1351
1352 spin_lock_irqsave(&ep->dev->lock, flags);
1353 if (!list_empty(&ep->queue)) {
1354 retval = -EAGAIN;
1355 goto print_unlock;
1356 } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1357 retval = -EAGAIN;
1358 goto print_unlock;
1359 } else {
1360 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1361 value ? "set" : "clear",
1362 wedged ? "wedge" : "halt");
1363 /* set/clear, then synch memory views with the device */
1364 if (value) {
1365 if (ep->num == 0)
1366 ep->dev->protocol_stall = 1;
1367 else
1368 set_halt(ep);
1369 if (wedged)
1370 ep->wedged = 1;
1371 } else {
1372 clear_halt(ep);
1373 if (ep->dev->quirks & PLX_PCIE &&
1374 !list_empty(&ep->queue) && ep->td_dma)
1375 restart_dma(ep);
1376 ep->wedged = 0;
1377 }
1378 (void) readl(&ep->regs->ep_rsp);
1379 }
1380 spin_unlock_irqrestore(&ep->dev->lock, flags);
1381
1382 return retval;
1383
1384 print_unlock:
1385 spin_unlock_irqrestore(&ep->dev->lock, flags);
1386 print_err:
1387 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1388 return retval;
1389 }
1390
1391 static int net2280_set_halt(struct usb_ep *_ep, int value)
1392 {
1393 return net2280_set_halt_and_wedge(_ep, value, 0);
1394 }
1395
1396 static int net2280_set_wedge(struct usb_ep *_ep)
1397 {
1398 if (!_ep || _ep->name == ep0name) {
1399 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1400 return -EINVAL;
1401 }
1402 return net2280_set_halt_and_wedge(_ep, 1, 1);
1403 }
1404
1405 static int net2280_fifo_status(struct usb_ep *_ep)
1406 {
1407 struct net2280_ep *ep;
1408 u32 avail;
1409
1410 ep = container_of(_ep, struct net2280_ep, ep);
1411 if (!_ep || (!ep->desc && ep->num != 0)) {
1412 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1413 return -ENODEV;
1414 }
1415 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1416 dev_err(&ep->dev->pdev->dev,
1417 "%s: Invalid driver=%p or speed=%d\n",
1418 __func__, ep->dev->driver, ep->dev->gadget.speed);
1419 return -ESHUTDOWN;
1420 }
1421
1422 avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1423 if (avail > ep->fifo_size) {
1424 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1425 return -EOVERFLOW;
1426 }
1427 if (ep->is_in)
1428 avail = ep->fifo_size - avail;
1429 return avail;
1430 }
1431
1432 static void net2280_fifo_flush(struct usb_ep *_ep)
1433 {
1434 struct net2280_ep *ep;
1435
1436 ep = container_of(_ep, struct net2280_ep, ep);
1437 if (!_ep || (!ep->desc && ep->num != 0)) {
1438 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1439 return;
1440 }
1441 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1442 dev_err(&ep->dev->pdev->dev,
1443 "%s: Invalid driver=%p or speed=%d\n",
1444 __func__, ep->dev->driver, ep->dev->gadget.speed);
1445 return;
1446 }
1447
1448 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1449 (void) readl(&ep->regs->ep_rsp);
1450 }
1451
1452 static const struct usb_ep_ops net2280_ep_ops = {
1453 .enable = net2280_enable,
1454 .disable = net2280_disable,
1455
1456 .alloc_request = net2280_alloc_request,
1457 .free_request = net2280_free_request,
1458
1459 .queue = net2280_queue,
1460 .dequeue = net2280_dequeue,
1461
1462 .set_halt = net2280_set_halt,
1463 .set_wedge = net2280_set_wedge,
1464 .fifo_status = net2280_fifo_status,
1465 .fifo_flush = net2280_fifo_flush,
1466 };
1467
1468 /*-------------------------------------------------------------------------*/
1469
1470 static int net2280_get_frame(struct usb_gadget *_gadget)
1471 {
1472 struct net2280 *dev;
1473 unsigned long flags;
1474 u16 retval;
1475
1476 if (!_gadget)
1477 return -ENODEV;
1478 dev = container_of(_gadget, struct net2280, gadget);
1479 spin_lock_irqsave(&dev->lock, flags);
1480 retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1481 spin_unlock_irqrestore(&dev->lock, flags);
1482 return retval;
1483 }
1484
1485 static int net2280_wakeup(struct usb_gadget *_gadget)
1486 {
1487 struct net2280 *dev;
1488 u32 tmp;
1489 unsigned long flags;
1490
1491 if (!_gadget)
1492 return 0;
1493 dev = container_of(_gadget, struct net2280, gadget);
1494
1495 spin_lock_irqsave(&dev->lock, flags);
1496 tmp = readl(&dev->usb->usbctl);
1497 if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1498 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1499 spin_unlock_irqrestore(&dev->lock, flags);
1500
1501 /* pci writes may still be posted */
1502 return 0;
1503 }
1504
1505 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1506 {
1507 struct net2280 *dev;
1508 u32 tmp;
1509 unsigned long flags;
1510
1511 if (!_gadget)
1512 return 0;
1513 dev = container_of(_gadget, struct net2280, gadget);
1514
1515 spin_lock_irqsave(&dev->lock, flags);
1516 tmp = readl(&dev->usb->usbctl);
1517 if (value) {
1518 tmp |= BIT(SELF_POWERED_STATUS);
1519 _gadget->is_selfpowered = 1;
1520 } else {
1521 tmp &= ~BIT(SELF_POWERED_STATUS);
1522 _gadget->is_selfpowered = 0;
1523 }
1524 writel(tmp, &dev->usb->usbctl);
1525 spin_unlock_irqrestore(&dev->lock, flags);
1526
1527 return 0;
1528 }
1529
1530 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1531 {
1532 struct net2280 *dev;
1533 u32 tmp;
1534 unsigned long flags;
1535
1536 if (!_gadget)
1537 return -ENODEV;
1538 dev = container_of(_gadget, struct net2280, gadget);
1539
1540 spin_lock_irqsave(&dev->lock, flags);
1541 tmp = readl(&dev->usb->usbctl);
1542 dev->softconnect = (is_on != 0);
1543 if (is_on) {
1544 ep0_start(dev);
1545 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1546 } else {
1547 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1548 stop_activity(dev, dev->driver);
1549 }
1550
1551 spin_unlock_irqrestore(&dev->lock, flags);
1552
1553 return 0;
1554 }
1555
1556 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1557 struct usb_endpoint_descriptor *desc,
1558 struct usb_ss_ep_comp_descriptor *ep_comp)
1559 {
1560 char name[8];
1561 struct usb_ep *ep;
1562
1563 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1564 /* ep-e, ep-f are PIO with only 64 byte fifos */
1565 ep = gadget_find_ep_by_name(_gadget, "ep-e");
1566 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1567 return ep;
1568 ep = gadget_find_ep_by_name(_gadget, "ep-f");
1569 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1570 return ep;
1571 }
1572
1573 /* USB3380: Only first four endpoints have DMA channels. Allocate
1574 * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1575 * endpoints use DMA hw endpoints.
1576 */
1577 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1578 usb_endpoint_dir_in(desc)) {
1579 ep = gadget_find_ep_by_name(_gadget, "ep2in");
1580 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1581 return ep;
1582 ep = gadget_find_ep_by_name(_gadget, "ep4in");
1583 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1584 return ep;
1585 } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1586 !usb_endpoint_dir_in(desc)) {
1587 ep = gadget_find_ep_by_name(_gadget, "ep1out");
1588 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1589 return ep;
1590 ep = gadget_find_ep_by_name(_gadget, "ep3out");
1591 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1592 return ep;
1593 } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1594 usb_endpoint_dir_in(desc)) {
1595 ep = gadget_find_ep_by_name(_gadget, "ep1in");
1596 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1597 return ep;
1598 ep = gadget_find_ep_by_name(_gadget, "ep3in");
1599 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1600 return ep;
1601 } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1602 !usb_endpoint_dir_in(desc)) {
1603 ep = gadget_find_ep_by_name(_gadget, "ep2out");
1604 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1605 return ep;
1606 ep = gadget_find_ep_by_name(_gadget, "ep4out");
1607 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1608 return ep;
1609 }
1610
1611 /* USB3380: use same address for usb and hardware endpoints */
1612 snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1613 usb_endpoint_dir_in(desc) ? "in" : "out");
1614 ep = gadget_find_ep_by_name(_gadget, name);
1615 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1616 return ep;
1617
1618 return NULL;
1619 }
1620
1621 static int net2280_start(struct usb_gadget *_gadget,
1622 struct usb_gadget_driver *driver);
1623 static int net2280_stop(struct usb_gadget *_gadget);
1624
1625 static const struct usb_gadget_ops net2280_ops = {
1626 .get_frame = net2280_get_frame,
1627 .wakeup = net2280_wakeup,
1628 .set_selfpowered = net2280_set_selfpowered,
1629 .pullup = net2280_pullup,
1630 .udc_start = net2280_start,
1631 .udc_stop = net2280_stop,
1632 .match_ep = net2280_match_ep,
1633 };
1634
1635 /*-------------------------------------------------------------------------*/
1636
1637 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1638
1639 /* FIXME move these into procfs, and use seq_file.
1640 * Sysfs _still_ doesn't behave for arbitrarily sized files,
1641 * and also doesn't help products using this with 2.4 kernels.
1642 */
1643
1644 /* "function" sysfs attribute */
1645 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1646 char *buf)
1647 {
1648 struct net2280 *dev = dev_get_drvdata(_dev);
1649
1650 if (!dev->driver || !dev->driver->function ||
1651 strlen(dev->driver->function) > PAGE_SIZE)
1652 return 0;
1653 return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1654 }
1655 static DEVICE_ATTR_RO(function);
1656
1657 static ssize_t registers_show(struct device *_dev,
1658 struct device_attribute *attr, char *buf)
1659 {
1660 struct net2280 *dev;
1661 char *next;
1662 unsigned size, t;
1663 unsigned long flags;
1664 int i;
1665 u32 t1, t2;
1666 const char *s;
1667
1668 dev = dev_get_drvdata(_dev);
1669 next = buf;
1670 size = PAGE_SIZE;
1671 spin_lock_irqsave(&dev->lock, flags);
1672
1673 if (dev->driver)
1674 s = dev->driver->driver.name;
1675 else
1676 s = "(none)";
1677
1678 /* Main Control Registers */
1679 t = scnprintf(next, size, "%s version " DRIVER_VERSION
1680 ", chiprev %04x\n\n"
1681 "devinit %03x fifoctl %08x gadget '%s'\n"
1682 "pci irqenb0 %02x irqenb1 %08x "
1683 "irqstat0 %04x irqstat1 %08x\n",
1684 driver_name, dev->chiprev,
1685 readl(&dev->regs->devinit),
1686 readl(&dev->regs->fifoctl),
1687 s,
1688 readl(&dev->regs->pciirqenb0),
1689 readl(&dev->regs->pciirqenb1),
1690 readl(&dev->regs->irqstat0),
1691 readl(&dev->regs->irqstat1));
1692 size -= t;
1693 next += t;
1694
1695 /* USB Control Registers */
1696 t1 = readl(&dev->usb->usbctl);
1697 t2 = readl(&dev->usb->usbstat);
1698 if (t1 & BIT(VBUS_PIN)) {
1699 if (t2 & BIT(HIGH_SPEED))
1700 s = "high speed";
1701 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1702 s = "powered";
1703 else
1704 s = "full speed";
1705 /* full speed bit (6) not working?? */
1706 } else
1707 s = "not attached";
1708 t = scnprintf(next, size,
1709 "stdrsp %08x usbctl %08x usbstat %08x "
1710 "addr 0x%02x (%s)\n",
1711 readl(&dev->usb->stdrsp), t1, t2,
1712 readl(&dev->usb->ouraddr), s);
1713 size -= t;
1714 next += t;
1715
1716 /* PCI Master Control Registers */
1717
1718 /* DMA Control Registers */
1719
1720 /* Configurable EP Control Registers */
1721 for (i = 0; i < dev->n_ep; i++) {
1722 struct net2280_ep *ep;
1723
1724 ep = &dev->ep[i];
1725 if (i && !ep->desc)
1726 continue;
1727
1728 t1 = readl(&ep->cfg->ep_cfg);
1729 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1730 t = scnprintf(next, size,
1731 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1732 "irqenb %02x\n",
1733 ep->ep.name, t1, t2,
1734 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1735 ? "NAK " : "",
1736 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1737 ? "hide " : "",
1738 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1739 ? "CRC " : "",
1740 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1741 ? "interrupt " : "",
1742 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1743 ? "status " : "",
1744 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1745 ? "NAKmode " : "",
1746 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1747 ? "DATA1 " : "DATA0 ",
1748 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1749 ? "HALT " : "",
1750 readl(&ep->regs->ep_irqenb));
1751 size -= t;
1752 next += t;
1753
1754 t = scnprintf(next, size,
1755 "\tstat %08x avail %04x "
1756 "(ep%d%s-%s)%s\n",
1757 readl(&ep->regs->ep_stat),
1758 readl(&ep->regs->ep_avail),
1759 t1 & 0x0f, DIR_STRING(t1),
1760 type_string(t1 >> 8),
1761 ep->stopped ? "*" : "");
1762 size -= t;
1763 next += t;
1764
1765 if (!ep->dma)
1766 continue;
1767
1768 t = scnprintf(next, size,
1769 " dma\tctl %08x stat %08x count %08x\n"
1770 "\taddr %08x desc %08x\n",
1771 readl(&ep->dma->dmactl),
1772 readl(&ep->dma->dmastat),
1773 readl(&ep->dma->dmacount),
1774 readl(&ep->dma->dmaaddr),
1775 readl(&ep->dma->dmadesc));
1776 size -= t;
1777 next += t;
1778
1779 }
1780
1781 /* Indexed Registers (none yet) */
1782
1783 /* Statistics */
1784 t = scnprintf(next, size, "\nirqs: ");
1785 size -= t;
1786 next += t;
1787 for (i = 0; i < dev->n_ep; i++) {
1788 struct net2280_ep *ep;
1789
1790 ep = &dev->ep[i];
1791 if (i && !ep->irqs)
1792 continue;
1793 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1794 size -= t;
1795 next += t;
1796
1797 }
1798 t = scnprintf(next, size, "\n");
1799 size -= t;
1800 next += t;
1801
1802 spin_unlock_irqrestore(&dev->lock, flags);
1803
1804 return PAGE_SIZE - size;
1805 }
1806 static DEVICE_ATTR_RO(registers);
1807
1808 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1809 char *buf)
1810 {
1811 struct net2280 *dev;
1812 char *next;
1813 unsigned size;
1814 unsigned long flags;
1815 int i;
1816
1817 dev = dev_get_drvdata(_dev);
1818 next = buf;
1819 size = PAGE_SIZE;
1820 spin_lock_irqsave(&dev->lock, flags);
1821
1822 for (i = 0; i < dev->n_ep; i++) {
1823 struct net2280_ep *ep = &dev->ep[i];
1824 struct net2280_request *req;
1825 int t;
1826
1827 if (i != 0) {
1828 const struct usb_endpoint_descriptor *d;
1829
1830 d = ep->desc;
1831 if (!d)
1832 continue;
1833 t = d->bEndpointAddress;
1834 t = scnprintf(next, size,
1835 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1836 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1837 (t & USB_DIR_IN) ? "in" : "out",
1838 type_string(d->bmAttributes),
1839 usb_endpoint_maxp(d),
1840 ep->dma ? "dma" : "pio", ep->fifo_size
1841 );
1842 } else /* ep0 should only have one transfer queued */
1843 t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1844 ep->is_in ? "in" : "out");
1845 if (t <= 0 || t > size)
1846 goto done;
1847 size -= t;
1848 next += t;
1849
1850 if (list_empty(&ep->queue)) {
1851 t = scnprintf(next, size, "\t(nothing queued)\n");
1852 if (t <= 0 || t > size)
1853 goto done;
1854 size -= t;
1855 next += t;
1856 continue;
1857 }
1858 list_for_each_entry(req, &ep->queue, queue) {
1859 if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1860 t = scnprintf(next, size,
1861 "\treq %p len %d/%d "
1862 "buf %p (dmacount %08x)\n",
1863 &req->req, req->req.actual,
1864 req->req.length, req->req.buf,
1865 readl(&ep->dma->dmacount));
1866 else
1867 t = scnprintf(next, size,
1868 "\treq %p len %d/%d buf %p\n",
1869 &req->req, req->req.actual,
1870 req->req.length, req->req.buf);
1871 if (t <= 0 || t > size)
1872 goto done;
1873 size -= t;
1874 next += t;
1875
1876 if (ep->dma) {
1877 struct net2280_dma *td;
1878
1879 td = req->td;
1880 t = scnprintf(next, size, "\t td %08x "
1881 " count %08x buf %08x desc %08x\n",
1882 (u32) req->td_dma,
1883 le32_to_cpu(td->dmacount),
1884 le32_to_cpu(td->dmaaddr),
1885 le32_to_cpu(td->dmadesc));
1886 if (t <= 0 || t > size)
1887 goto done;
1888 size -= t;
1889 next += t;
1890 }
1891 }
1892 }
1893
1894 done:
1895 spin_unlock_irqrestore(&dev->lock, flags);
1896 return PAGE_SIZE - size;
1897 }
1898 static DEVICE_ATTR_RO(queues);
1899
1900
1901 #else
1902
1903 #define device_create_file(a, b) (0)
1904 #define device_remove_file(a, b) do { } while (0)
1905
1906 #endif
1907
1908 /*-------------------------------------------------------------------------*/
1909
1910 /* another driver-specific mode might be a request type doing dma
1911 * to/from another device fifo instead of to/from memory.
1912 */
1913
1914 static void set_fifo_mode(struct net2280 *dev, int mode)
1915 {
1916 /* keeping high bits preserves BAR2 */
1917 writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1918
1919 /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1920 INIT_LIST_HEAD(&dev->gadget.ep_list);
1921 list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1922 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1923 switch (mode) {
1924 case 0:
1925 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1926 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1927 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1928 break;
1929 case 1:
1930 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1931 break;
1932 case 2:
1933 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1934 dev->ep[1].fifo_size = 2048;
1935 dev->ep[2].fifo_size = 1024;
1936 break;
1937 }
1938 /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1939 list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1940 list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1941 }
1942
1943 static void defect7374_disable_data_eps(struct net2280 *dev)
1944 {
1945 /*
1946 * For Defect 7374, disable data EPs (and more):
1947 * - This phase undoes the earlier phase of the Defect 7374 workaround,
1948 * returing ep regs back to normal.
1949 */
1950 struct net2280_ep *ep;
1951 int i;
1952 unsigned char ep_sel;
1953 u32 tmp_reg;
1954
1955 for (i = 1; i < 5; i++) {
1956 ep = &dev->ep[i];
1957 writel(i, &ep->cfg->ep_cfg);
1958 }
1959
1960 /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1961 for (i = 0; i < 6; i++)
1962 writel(0, &dev->dep[i].dep_cfg);
1963
1964 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1965 /* Select an endpoint for subsequent operations: */
1966 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1967 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1968
1969 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1970 ep_sel == 18 || ep_sel == 20)
1971 continue;
1972
1973 /* Change settings on some selected endpoints */
1974 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1975 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1976 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1977 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1978 tmp_reg |= BIT(EP_INITIALIZED);
1979 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1980 }
1981 }
1982
1983 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1984 {
1985 u32 tmp = 0, tmp_reg;
1986 u32 scratch;
1987 int i;
1988 unsigned char ep_sel;
1989
1990 scratch = get_idx_reg(dev->regs, SCRATCH);
1991
1992 WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1993 == DEFECT7374_FSM_SS_CONTROL_READ);
1994
1995 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1996
1997 ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1998 ep_warn(dev, "It will operate on cold-reboot and SS connect");
1999
2000 /*GPEPs:*/
2001 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
2002 (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
2003 ((dev->enhanced_mode) ?
2004 BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
2005 BIT(ENDPOINT_ENABLE)));
2006
2007 for (i = 1; i < 5; i++)
2008 writel(tmp, &dev->ep[i].cfg->ep_cfg);
2009
2010 /* CSRIN, PCIIN, STATIN, RCIN*/
2011 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2012 writel(tmp, &dev->dep[1].dep_cfg);
2013 writel(tmp, &dev->dep[3].dep_cfg);
2014 writel(tmp, &dev->dep[4].dep_cfg);
2015 writel(tmp, &dev->dep[5].dep_cfg);
2016
2017 /*Implemented for development and debug.
2018 * Can be refined/tuned later.*/
2019 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2020 /* Select an endpoint for subsequent operations: */
2021 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2022 writel(((tmp_reg & ~0x1f) | ep_sel),
2023 &dev->plregs->pl_ep_ctrl);
2024
2025 if (ep_sel == 1) {
2026 tmp =
2027 (readl(&dev->plregs->pl_ep_ctrl) |
2028 BIT(CLEAR_ACK_ERROR_CODE) | 0);
2029 writel(tmp, &dev->plregs->pl_ep_ctrl);
2030 continue;
2031 }
2032
2033 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2034 ep_sel == 18 || ep_sel == 20)
2035 continue;
2036
2037 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2038 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2039 writel(tmp, &dev->plregs->pl_ep_cfg_4);
2040
2041 tmp = readl(&dev->plregs->pl_ep_ctrl) &
2042 ~BIT(EP_INITIALIZED);
2043 writel(tmp, &dev->plregs->pl_ep_ctrl);
2044
2045 }
2046
2047 /* Set FSM to focus on the first Control Read:
2048 * - Tip: Connection speed is known upon the first
2049 * setup request.*/
2050 scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2051 set_idx_reg(dev->regs, SCRATCH, scratch);
2052
2053 }
2054
2055 /* keeping it simple:
2056 * - one bus driver, initted first;
2057 * - one function driver, initted second
2058 *
2059 * most of the work to support multiple net2280 controllers would
2060 * be to associate this gadget driver (yes?) with all of them, or
2061 * perhaps to bind specific drivers to specific devices.
2062 */
2063
2064 static void usb_reset_228x(struct net2280 *dev)
2065 {
2066 u32 tmp;
2067
2068 dev->gadget.speed = USB_SPEED_UNKNOWN;
2069 (void) readl(&dev->usb->usbctl);
2070
2071 net2280_led_init(dev);
2072
2073 /* disable automatic responses, and irqs */
2074 writel(0, &dev->usb->stdrsp);
2075 writel(0, &dev->regs->pciirqenb0);
2076 writel(0, &dev->regs->pciirqenb1);
2077
2078 /* clear old dma and irq state */
2079 for (tmp = 0; tmp < 4; tmp++) {
2080 struct net2280_ep *ep = &dev->ep[tmp + 1];
2081 if (ep->dma)
2082 abort_dma(ep);
2083 }
2084
2085 writel(~0, &dev->regs->irqstat0),
2086 writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2087
2088 /* reset, and enable pci */
2089 tmp = readl(&dev->regs->devinit) |
2090 BIT(PCI_ENABLE) |
2091 BIT(FIFO_SOFT_RESET) |
2092 BIT(USB_SOFT_RESET) |
2093 BIT(M8051_RESET);
2094 writel(tmp, &dev->regs->devinit);
2095
2096 /* standard fifo and endpoint allocations */
2097 set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2098 }
2099
2100 static void usb_reset_338x(struct net2280 *dev)
2101 {
2102 u32 tmp;
2103
2104 dev->gadget.speed = USB_SPEED_UNKNOWN;
2105 (void)readl(&dev->usb->usbctl);
2106
2107 net2280_led_init(dev);
2108
2109 if (dev->bug7734_patched) {
2110 /* disable automatic responses, and irqs */
2111 writel(0, &dev->usb->stdrsp);
2112 writel(0, &dev->regs->pciirqenb0);
2113 writel(0, &dev->regs->pciirqenb1);
2114 }
2115
2116 /* clear old dma and irq state */
2117 for (tmp = 0; tmp < 4; tmp++) {
2118 struct net2280_ep *ep = &dev->ep[tmp + 1];
2119 struct net2280_dma_regs __iomem *dma;
2120
2121 if (ep->dma) {
2122 abort_dma(ep);
2123 } else {
2124 dma = &dev->dma[tmp];
2125 writel(BIT(DMA_ABORT), &dma->dmastat);
2126 writel(0, &dma->dmactl);
2127 }
2128 }
2129
2130 writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2131
2132 if (dev->bug7734_patched) {
2133 /* reset, and enable pci */
2134 tmp = readl(&dev->regs->devinit) |
2135 BIT(PCI_ENABLE) |
2136 BIT(FIFO_SOFT_RESET) |
2137 BIT(USB_SOFT_RESET) |
2138 BIT(M8051_RESET);
2139
2140 writel(tmp, &dev->regs->devinit);
2141 }
2142
2143 /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2144 INIT_LIST_HEAD(&dev->gadget.ep_list);
2145
2146 for (tmp = 1; tmp < dev->n_ep; tmp++)
2147 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2148
2149 }
2150
2151 static void usb_reset(struct net2280 *dev)
2152 {
2153 if (dev->quirks & PLX_LEGACY)
2154 return usb_reset_228x(dev);
2155 return usb_reset_338x(dev);
2156 }
2157
2158 static void usb_reinit_228x(struct net2280 *dev)
2159 {
2160 u32 tmp;
2161
2162 /* basic endpoint init */
2163 for (tmp = 0; tmp < 7; tmp++) {
2164 struct net2280_ep *ep = &dev->ep[tmp];
2165
2166 ep->ep.name = ep_info_dft[tmp].name;
2167 ep->ep.caps = ep_info_dft[tmp].caps;
2168 ep->dev = dev;
2169 ep->num = tmp;
2170
2171 if (tmp > 0 && tmp <= 4) {
2172 ep->fifo_size = 1024;
2173 ep->dma = &dev->dma[tmp - 1];
2174 } else
2175 ep->fifo_size = 64;
2176 ep->regs = &dev->epregs[tmp];
2177 ep->cfg = &dev->epregs[tmp];
2178 ep_reset_228x(dev->regs, ep);
2179 }
2180 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2181 usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2182 usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2183
2184 dev->gadget.ep0 = &dev->ep[0].ep;
2185 dev->ep[0].stopped = 0;
2186 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2187
2188 /* we want to prevent lowlevel/insecure access from the USB host,
2189 * but erratum 0119 means this enable bit is ignored
2190 */
2191 for (tmp = 0; tmp < 5; tmp++)
2192 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2193 }
2194
2195 static void usb_reinit_338x(struct net2280 *dev)
2196 {
2197 int i;
2198 u32 tmp, val;
2199 static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2200 static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2201 0x00, 0xC0, 0x00, 0xC0 };
2202
2203 /* basic endpoint init */
2204 for (i = 0; i < dev->n_ep; i++) {
2205 struct net2280_ep *ep = &dev->ep[i];
2206
2207 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2208 ep_info_dft[i].name;
2209 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2210 ep_info_dft[i].caps;
2211 ep->dev = dev;
2212 ep->num = i;
2213
2214 if (i > 0 && i <= 4)
2215 ep->dma = &dev->dma[i - 1];
2216
2217 if (dev->enhanced_mode) {
2218 ep->cfg = &dev->epregs[ne[i]];
2219 /*
2220 * Set USB endpoint number, hardware allows same number
2221 * in both directions.
2222 */
2223 if (i > 0 && i < 5)
2224 writel(ne[i], &ep->cfg->ep_cfg);
2225 ep->regs = (struct net2280_ep_regs __iomem *)
2226 (((void __iomem *)&dev->epregs[ne[i]]) +
2227 ep_reg_addr[i]);
2228 } else {
2229 ep->cfg = &dev->epregs[i];
2230 ep->regs = &dev->epregs[i];
2231 }
2232
2233 ep->fifo_size = (i != 0) ? 2048 : 512;
2234
2235 ep_reset_338x(dev->regs, ep);
2236 }
2237 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2238
2239 dev->gadget.ep0 = &dev->ep[0].ep;
2240 dev->ep[0].stopped = 0;
2241
2242 /* Link layer set up */
2243 if (dev->bug7734_patched) {
2244 tmp = readl(&dev->usb_ext->usbctl2) &
2245 ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2246 writel(tmp, &dev->usb_ext->usbctl2);
2247 }
2248
2249 /* Hardware Defect and Workaround */
2250 val = readl(&dev->ll_lfps_regs->ll_lfps_5);
2251 val &= ~(0xf << TIMER_LFPS_6US);
2252 val |= 0x5 << TIMER_LFPS_6US;
2253 writel(val, &dev->ll_lfps_regs->ll_lfps_5);
2254
2255 val = readl(&dev->ll_lfps_regs->ll_lfps_6);
2256 val &= ~(0xffff << TIMER_LFPS_80US);
2257 val |= 0x0100 << TIMER_LFPS_80US;
2258 writel(val, &dev->ll_lfps_regs->ll_lfps_6);
2259
2260 /*
2261 * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2262 * Hot Reset Exit Handshake may Fail in Specific Case using
2263 * Default Register Settings. Workaround for Enumeration test.
2264 */
2265 val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
2266 val &= ~(0x1f << HOT_TX_NORESET_TS2);
2267 val |= 0x10 << HOT_TX_NORESET_TS2;
2268 writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
2269
2270 val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
2271 val &= ~(0x1f << HOT_RX_RESET_TS2);
2272 val |= 0x3 << HOT_RX_RESET_TS2;
2273 writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
2274
2275 /*
2276 * Set Recovery Idle to Recover bit:
2277 * - On SS connections, setting Recovery Idle to Recover Fmw improves
2278 * link robustness with various hosts and hubs.
2279 * - It is safe to set for all connection speeds; all chip revisions.
2280 * - R-M-W to leave other bits undisturbed.
2281 * - Reference PLX TT-7372
2282 */
2283 val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
2284 val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2285 writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
2286
2287 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2288
2289 /* disable dedicated endpoints */
2290 writel(0x0D, &dev->dep[0].dep_cfg);
2291 writel(0x0D, &dev->dep[1].dep_cfg);
2292 writel(0x0E, &dev->dep[2].dep_cfg);
2293 writel(0x0E, &dev->dep[3].dep_cfg);
2294 writel(0x0F, &dev->dep[4].dep_cfg);
2295 writel(0x0C, &dev->dep[5].dep_cfg);
2296 }
2297
2298 static void usb_reinit(struct net2280 *dev)
2299 {
2300 if (dev->quirks & PLX_LEGACY)
2301 return usb_reinit_228x(dev);
2302 return usb_reinit_338x(dev);
2303 }
2304
2305 static void ep0_start_228x(struct net2280 *dev)
2306 {
2307 writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2308 BIT(CLEAR_NAK_OUT_PACKETS) |
2309 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2310 &dev->epregs[0].ep_rsp);
2311
2312 /*
2313 * hardware optionally handles a bunch of standard requests
2314 * that the API hides from drivers anyway. have it do so.
2315 * endpoint status/features are handled in software, to
2316 * help pass tests for some dubious behavior.
2317 */
2318 writel(BIT(SET_TEST_MODE) |
2319 BIT(SET_ADDRESS) |
2320 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2321 BIT(GET_DEVICE_STATUS) |
2322 BIT(GET_INTERFACE_STATUS),
2323 &dev->usb->stdrsp);
2324 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2325 BIT(SELF_POWERED_USB_DEVICE) |
2326 BIT(REMOTE_WAKEUP_SUPPORT) |
2327 (dev->softconnect << USB_DETECT_ENABLE) |
2328 BIT(SELF_POWERED_STATUS),
2329 &dev->usb->usbctl);
2330
2331 /* enable irqs so we can see ep0 and general operation */
2332 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2333 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2334 &dev->regs->pciirqenb0);
2335 writel(BIT(PCI_INTERRUPT_ENABLE) |
2336 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2337 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2338 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2339 BIT(VBUS_INTERRUPT_ENABLE) |
2340 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2341 BIT(SUSPEND_REQUEST_CHANGE_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_338x(struct net2280 *dev)
2349 {
2350
2351 if (dev->bug7734_patched)
2352 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2353 BIT(SET_EP_HIDE_STATUS_PHASE),
2354 &dev->epregs[0].ep_rsp);
2355
2356 /*
2357 * hardware optionally handles a bunch of standard requests
2358 * that the API hides from drivers anyway. have it do so.
2359 * endpoint status/features are handled in software, to
2360 * help pass tests for some dubious behavior.
2361 */
2362 writel(BIT(SET_ISOCHRONOUS_DELAY) |
2363 BIT(SET_SEL) |
2364 BIT(SET_TEST_MODE) |
2365 BIT(SET_ADDRESS) |
2366 BIT(GET_INTERFACE_STATUS) |
2367 BIT(GET_DEVICE_STATUS),
2368 &dev->usb->stdrsp);
2369 dev->wakeup_enable = 1;
2370 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2371 (dev->softconnect << USB_DETECT_ENABLE) |
2372 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2373 &dev->usb->usbctl);
2374
2375 /* enable irqs so we can see ep0 and general operation */
2376 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2377 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2378 &dev->regs->pciirqenb0);
2379 writel(BIT(PCI_INTERRUPT_ENABLE) |
2380 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2381 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2382 BIT(VBUS_INTERRUPT_ENABLE),
2383 &dev->regs->pciirqenb1);
2384
2385 /* don't leave any writes posted */
2386 (void)readl(&dev->usb->usbctl);
2387 }
2388
2389 static void ep0_start(struct net2280 *dev)
2390 {
2391 if (dev->quirks & PLX_LEGACY)
2392 return ep0_start_228x(dev);
2393 return ep0_start_338x(dev);
2394 }
2395
2396 /* when a driver is successfully registered, it will receive
2397 * control requests including set_configuration(), which enables
2398 * non-control requests. then usb traffic follows until a
2399 * disconnect is reported. then a host may connect again, or
2400 * the driver might get unbound.
2401 */
2402 static int net2280_start(struct usb_gadget *_gadget,
2403 struct usb_gadget_driver *driver)
2404 {
2405 struct net2280 *dev;
2406 int retval;
2407 unsigned i;
2408
2409 /* insist on high speed support from the driver, since
2410 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2411 * "must not be used in normal operation"
2412 */
2413 if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2414 !driver->setup)
2415 return -EINVAL;
2416
2417 dev = container_of(_gadget, struct net2280, gadget);
2418
2419 for (i = 0; i < dev->n_ep; i++)
2420 dev->ep[i].irqs = 0;
2421
2422 /* hook up the driver ... */
2423 driver->driver.bus = NULL;
2424 dev->driver = driver;
2425
2426 retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2427 if (retval)
2428 goto err_unbind;
2429 retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2430 if (retval)
2431 goto err_func;
2432
2433 /* enable host detection and ep0; and we're ready
2434 * for set_configuration as well as eventual disconnect.
2435 */
2436 net2280_led_active(dev, 1);
2437
2438 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2439 defect7374_enable_data_eps_zero(dev);
2440
2441 ep0_start(dev);
2442
2443 /* pci writes may still be posted */
2444 return 0;
2445
2446 err_func:
2447 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2448 err_unbind:
2449 dev->driver = NULL;
2450 return retval;
2451 }
2452
2453 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2454 {
2455 int i;
2456
2457 /* don't disconnect if it's not connected */
2458 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2459 driver = NULL;
2460
2461 /* stop hardware; prevent new request submissions;
2462 * and kill any outstanding requests.
2463 */
2464 usb_reset(dev);
2465 for (i = 0; i < dev->n_ep; i++)
2466 nuke(&dev->ep[i]);
2467
2468 /* report disconnect; the driver is already quiesced */
2469 if (driver)
2470 driver->disconnect(&dev->gadget);
2471
2472 usb_reinit(dev);
2473 }
2474
2475 static int net2280_stop(struct usb_gadget *_gadget)
2476 {
2477 struct net2280 *dev;
2478 unsigned long flags;
2479
2480 dev = container_of(_gadget, struct net2280, gadget);
2481
2482 spin_lock_irqsave(&dev->lock, flags);
2483 stop_activity(dev, NULL);
2484 spin_unlock_irqrestore(&dev->lock, flags);
2485
2486 net2280_led_active(dev, 0);
2487
2488 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2489 device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2490
2491 dev->driver = NULL;
2492
2493 return 0;
2494 }
2495
2496 /*-------------------------------------------------------------------------*/
2497
2498 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2499 * also works for dma-capable endpoints, in pio mode or just
2500 * to manually advance the queue after short OUT transfers.
2501 */
2502 static void handle_ep_small(struct net2280_ep *ep)
2503 {
2504 struct net2280_request *req;
2505 u32 t;
2506 /* 0 error, 1 mid-data, 2 done */
2507 int mode = 1;
2508
2509 if (!list_empty(&ep->queue))
2510 req = list_entry(ep->queue.next,
2511 struct net2280_request, queue);
2512 else
2513 req = NULL;
2514
2515 /* ack all, and handle what we care about */
2516 t = readl(&ep->regs->ep_stat);
2517 ep->irqs++;
2518
2519 ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2520 ep->ep.name, t, req ? &req->req : NULL);
2521
2522 if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2523 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2524 else
2525 /* Added for 2282 */
2526 writel(t, &ep->regs->ep_stat);
2527
2528 /* for ep0, monitor token irqs to catch data stage length errors
2529 * and to synchronize on status.
2530 *
2531 * also, to defer reporting of protocol stalls ... here's where
2532 * data or status first appears, handling stalls here should never
2533 * cause trouble on the host side..
2534 *
2535 * control requests could be slightly faster without token synch for
2536 * status, but status can jam up that way.
2537 */
2538 if (unlikely(ep->num == 0)) {
2539 if (ep->is_in) {
2540 /* status; stop NAKing */
2541 if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2542 if (ep->dev->protocol_stall) {
2543 ep->stopped = 1;
2544 set_halt(ep);
2545 }
2546 if (!req)
2547 allow_status(ep);
2548 mode = 2;
2549 /* reply to extra IN data tokens with a zlp */
2550 } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2551 if (ep->dev->protocol_stall) {
2552 ep->stopped = 1;
2553 set_halt(ep);
2554 mode = 2;
2555 } else if (ep->responded &&
2556 !req && !ep->stopped)
2557 write_fifo(ep, NULL);
2558 }
2559 } else {
2560 /* status; stop NAKing */
2561 if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2562 if (ep->dev->protocol_stall) {
2563 ep->stopped = 1;
2564 set_halt(ep);
2565 }
2566 mode = 2;
2567 /* an extra OUT token is an error */
2568 } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2569 req &&
2570 req->req.actual == req->req.length) ||
2571 (ep->responded && !req)) {
2572 ep->dev->protocol_stall = 1;
2573 set_halt(ep);
2574 ep->stopped = 1;
2575 if (req)
2576 done(ep, req, -EOVERFLOW);
2577 req = NULL;
2578 }
2579 }
2580 }
2581
2582 if (unlikely(!req))
2583 return;
2584
2585 /* manual DMA queue advance after short OUT */
2586 if (likely(ep->dma)) {
2587 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2588 struct net2280_request *stuck_req = NULL;
2589 int stopped = ep->stopped;
2590 int num_completed;
2591 int stuck = 0;
2592 u32 count;
2593
2594 /* TRANSFERRED works around OUT_DONE erratum 0112.
2595 * we expect (N <= maxpacket) bytes; host wrote M.
2596 * iff (M < N) we won't ever see a DMA interrupt.
2597 */
2598 ep->stopped = 1;
2599 for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2600
2601 /* any preceding dma transfers must finish.
2602 * dma handles (M >= N), may empty the queue
2603 */
2604 num_completed = scan_dma_completions(ep);
2605 if (unlikely(list_empty(&ep->queue) ||
2606 ep->out_overflow)) {
2607 req = NULL;
2608 break;
2609 }
2610 req = list_entry(ep->queue.next,
2611 struct net2280_request, queue);
2612
2613 /* here either (M < N), a "real" short rx;
2614 * or (M == N) and the queue didn't empty
2615 */
2616 if (likely(t & BIT(FIFO_EMPTY))) {
2617 count = readl(&ep->dma->dmacount);
2618 count &= DMA_BYTE_COUNT_MASK;
2619 if (readl(&ep->dma->dmadesc)
2620 != req->td_dma)
2621 req = NULL;
2622 break;
2623 }
2624
2625 /* Escape loop if no dma transfers completed
2626 * after few retries.
2627 */
2628 if (num_completed == 0) {
2629 if (stuck_req == req &&
2630 readl(&ep->dma->dmadesc) !=
2631 req->td_dma && stuck++ > 5) {
2632 count = readl(
2633 &ep->dma->dmacount);
2634 count &= DMA_BYTE_COUNT_MASK;
2635 req = NULL;
2636 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2637 ep->ep.name, stuck,
2638 count);
2639 break;
2640 } else if (stuck_req != req) {
2641 stuck_req = req;
2642 stuck = 0;
2643 }
2644 } else {
2645 stuck_req = NULL;
2646 stuck = 0;
2647 }
2648
2649 udelay(1);
2650 }
2651
2652 /* stop DMA, leave ep NAKing */
2653 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2654 spin_stop_dma(ep->dma);
2655
2656 if (likely(req)) {
2657 req->td->dmacount = 0;
2658 t = readl(&ep->regs->ep_avail);
2659 dma_done(ep, req, count,
2660 (ep->out_overflow || t)
2661 ? -EOVERFLOW : 0);
2662 }
2663
2664 /* also flush to prevent erratum 0106 trouble */
2665 if (unlikely(ep->out_overflow ||
2666 (ep->dev->chiprev == 0x0100 &&
2667 ep->dev->gadget.speed
2668 == USB_SPEED_FULL))) {
2669 out_flush(ep);
2670 ep->out_overflow = 0;
2671 }
2672
2673 /* (re)start dma if needed, stop NAKing */
2674 ep->stopped = stopped;
2675 if (!list_empty(&ep->queue))
2676 restart_dma(ep);
2677 } else
2678 ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2679 ep->ep.name, t);
2680 return;
2681
2682 /* data packet(s) received (in the fifo, OUT) */
2683 } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2684 if (read_fifo(ep, req) && ep->num != 0)
2685 mode = 2;
2686
2687 /* data packet(s) transmitted (IN) */
2688 } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2689 unsigned len;
2690
2691 len = req->req.length - req->req.actual;
2692 if (len > ep->ep.maxpacket)
2693 len = ep->ep.maxpacket;
2694 req->req.actual += len;
2695
2696 /* if we wrote it all, we're usually done */
2697 /* send zlps until the status stage */
2698 if ((req->req.actual == req->req.length) &&
2699 (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2700 mode = 2;
2701
2702 /* there was nothing to do ... */
2703 } else if (mode == 1)
2704 return;
2705
2706 /* done */
2707 if (mode == 2) {
2708 /* stream endpoints often resubmit/unlink in completion */
2709 done(ep, req, 0);
2710
2711 /* maybe advance queue to next request */
2712 if (ep->num == 0) {
2713 /* NOTE: net2280 could let gadget driver start the
2714 * status stage later. since not all controllers let
2715 * them control that, the api doesn't (yet) allow it.
2716 */
2717 if (!ep->stopped)
2718 allow_status(ep);
2719 req = NULL;
2720 } else {
2721 if (!list_empty(&ep->queue) && !ep->stopped)
2722 req = list_entry(ep->queue.next,
2723 struct net2280_request, queue);
2724 else
2725 req = NULL;
2726 if (req && !ep->is_in)
2727 stop_out_naking(ep);
2728 }
2729 }
2730
2731 /* is there a buffer for the next packet?
2732 * for best streaming performance, make sure there is one.
2733 */
2734 if (req && !ep->stopped) {
2735
2736 /* load IN fifo with next packet (may be zlp) */
2737 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2738 write_fifo(ep, &req->req);
2739 }
2740 }
2741
2742 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2743 {
2744 struct net2280_ep *ep;
2745
2746 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2747 return &dev->ep[0];
2748 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2749 u8 bEndpointAddress;
2750
2751 if (!ep->desc)
2752 continue;
2753 bEndpointAddress = ep->desc->bEndpointAddress;
2754 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2755 continue;
2756 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2757 return ep;
2758 }
2759 return NULL;
2760 }
2761
2762 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2763 {
2764 u32 scratch, fsmvalue;
2765 u32 ack_wait_timeout, state;
2766
2767 /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2768 scratch = get_idx_reg(dev->regs, SCRATCH);
2769 fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2770 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2771
2772 if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2773 (r.bRequestType & USB_DIR_IN)))
2774 return;
2775
2776 /* This is the first Control Read for this connection: */
2777 if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2778 /*
2779 * Connection is NOT SS:
2780 * - Connection must be FS or HS.
2781 * - This FSM state should allow workaround software to
2782 * run after the next USB connection.
2783 */
2784 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2785 dev->bug7734_patched = 1;
2786 goto restore_data_eps;
2787 }
2788
2789 /* Connection is SS: */
2790 for (ack_wait_timeout = 0;
2791 ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2792 ack_wait_timeout++) {
2793
2794 state = readl(&dev->plregs->pl_ep_status_1)
2795 & (0xff << STATE);
2796 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2797 (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2798 scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2799 dev->bug7734_patched = 1;
2800 break;
2801 }
2802
2803 /*
2804 * We have not yet received host's Data Phase ACK
2805 * - Wait and try again.
2806 */
2807 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2808
2809 continue;
2810 }
2811
2812
2813 if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2814 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2815 "to detect SS host's data phase ACK.");
2816 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2817 "got 0x%2.2x.\n", state >> STATE);
2818 } else {
2819 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2820 "%duSec for Control Read Data Phase ACK\n",
2821 DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2822 }
2823
2824 restore_data_eps:
2825 /*
2826 * Restore data EPs to their pre-workaround settings (disabled,
2827 * initialized, and other details).
2828 */
2829 defect7374_disable_data_eps(dev);
2830
2831 set_idx_reg(dev->regs, SCRATCH, scratch);
2832
2833 return;
2834 }
2835
2836 static void ep_clear_seqnum(struct net2280_ep *ep)
2837 {
2838 struct net2280 *dev = ep->dev;
2839 u32 val;
2840 static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2841
2842 val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2843 val |= ep_pl[ep->num];
2844 writel(val, &dev->plregs->pl_ep_ctrl);
2845 val |= BIT(SEQUENCE_NUMBER_RESET);
2846 writel(val, &dev->plregs->pl_ep_ctrl);
2847
2848 return;
2849 }
2850
2851 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2852 struct net2280_ep *ep, struct usb_ctrlrequest r)
2853 {
2854 int tmp = 0;
2855
2856 #define w_value le16_to_cpu(r.wValue)
2857 #define w_index le16_to_cpu(r.wIndex)
2858 #define w_length le16_to_cpu(r.wLength)
2859
2860 switch (r.bRequest) {
2861 struct net2280_ep *e;
2862 u16 status;
2863
2864 case USB_REQ_SET_CONFIGURATION:
2865 dev->addressed_state = !w_value;
2866 goto usb3_delegate;
2867
2868 case USB_REQ_GET_STATUS:
2869 switch (r.bRequestType) {
2870 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2871 status = dev->wakeup_enable ? 0x02 : 0x00;
2872 if (dev->gadget.is_selfpowered)
2873 status |= BIT(0);
2874 status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2875 dev->ltm_enable << 4);
2876 writel(0, &dev->epregs[0].ep_irqenb);
2877 set_fifo_bytecount(ep, sizeof(status));
2878 writel((__force u32) status, &dev->epregs[0].ep_data);
2879 allow_status_338x(ep);
2880 break;
2881
2882 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2883 e = get_ep_by_addr(dev, w_index);
2884 if (!e)
2885 goto do_stall3;
2886 status = readl(&e->regs->ep_rsp) &
2887 BIT(CLEAR_ENDPOINT_HALT);
2888 writel(0, &dev->epregs[0].ep_irqenb);
2889 set_fifo_bytecount(ep, sizeof(status));
2890 writel((__force u32) status, &dev->epregs[0].ep_data);
2891 allow_status_338x(ep);
2892 break;
2893
2894 default:
2895 goto usb3_delegate;
2896 }
2897 break;
2898
2899 case USB_REQ_CLEAR_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 = 0;
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 = 0;
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 = 0;
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
2928 default:
2929 break;
2930 }
2931 }
2932 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2933 dev->wakeup_enable = 0;
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)
2945 goto do_stall3;
2946 if (w_value != USB_ENDPOINT_HALT)
2947 goto do_stall3;
2948 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2949 /*
2950 * Workaround for SS SeqNum not cleared via
2951 * Endpoint Halt (Clear) bit. select endpoint
2952 */
2953 ep_clear_seqnum(e);
2954 clear_halt(e);
2955 if (!list_empty(&e->queue) && e->td_dma)
2956 restart_dma(e);
2957 allow_status(ep);
2958 ep->stopped = 1;
2959 break;
2960
2961 default:
2962 goto usb3_delegate;
2963 }
2964 break;
2965 case USB_REQ_SET_FEATURE:
2966 switch (r.bRequestType) {
2967 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2968 if (!dev->addressed_state) {
2969 switch (w_value) {
2970 case USB_DEVICE_U1_ENABLE:
2971 dev->u1_enable = 1;
2972 writel(readl(&dev->usb_ext->usbctl2) |
2973 BIT(U1_ENABLE),
2974 &dev->usb_ext->usbctl2);
2975 allow_status_338x(ep);
2976 goto next_endpoints3;
2977
2978 case USB_DEVICE_U2_ENABLE:
2979 dev->u2_enable = 1;
2980 writel(readl(&dev->usb_ext->usbctl2) |
2981 BIT(U2_ENABLE),
2982 &dev->usb_ext->usbctl2);
2983 allow_status_338x(ep);
2984 goto next_endpoints3;
2985
2986 case USB_DEVICE_LTM_ENABLE:
2987 dev->ltm_enable = 1;
2988 writel(readl(&dev->usb_ext->usbctl2) |
2989 BIT(LTM_ENABLE),
2990 &dev->usb_ext->usbctl2);
2991 allow_status_338x(ep);
2992 goto next_endpoints3;
2993 default:
2994 break;
2995 }
2996 }
2997
2998 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2999 dev->wakeup_enable = 1;
3000 writel(readl(&dev->usb->usbctl) |
3001 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
3002 &dev->usb->usbctl);
3003 allow_status_338x(ep);
3004 break;
3005 }
3006 goto usb3_delegate;
3007
3008 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
3009 e = get_ep_by_addr(dev, w_index);
3010 if (!e || (w_value != USB_ENDPOINT_HALT))
3011 goto do_stall3;
3012 ep->stopped = 1;
3013 if (ep->num == 0)
3014 ep->dev->protocol_stall = 1;
3015 else {
3016 if (ep->dma)
3017 abort_dma(ep);
3018 set_halt(ep);
3019 }
3020 allow_status_338x(ep);
3021 break;
3022
3023 default:
3024 goto usb3_delegate;
3025 }
3026
3027 break;
3028 default:
3029
3030 usb3_delegate:
3031 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
3032 r.bRequestType, r.bRequest,
3033 w_value, w_index, w_length,
3034 readl(&ep->cfg->ep_cfg));
3035
3036 ep->responded = 0;
3037 spin_unlock(&dev->lock);
3038 tmp = dev->driver->setup(&dev->gadget, &r);
3039 spin_lock(&dev->lock);
3040 }
3041 do_stall3:
3042 if (tmp < 0) {
3043 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3044 r.bRequestType, r.bRequest, tmp);
3045 dev->protocol_stall = 1;
3046 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
3047 set_halt(ep);
3048 }
3049
3050 next_endpoints3:
3051
3052 #undef w_value
3053 #undef w_index
3054 #undef w_length
3055
3056 return;
3057 }
3058
3059 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
3060 {
3061 u32 index;
3062 u32 bit;
3063
3064 for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
3065 bit = BIT(ep_bit[index]);
3066
3067 if (!stat0)
3068 break;
3069
3070 if (!(stat0 & bit))
3071 continue;
3072
3073 stat0 &= ~bit;
3074
3075 handle_ep_small(&dev->ep[index]);
3076 }
3077 }
3078
3079 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3080 {
3081 struct net2280_ep *ep;
3082 u32 num, scratch;
3083
3084 /* most of these don't need individual acks */
3085 stat &= ~BIT(INTA_ASSERTED);
3086 if (!stat)
3087 return;
3088 /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3089
3090 /* starting a control request? */
3091 if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3092 union {
3093 u32 raw[2];
3094 struct usb_ctrlrequest r;
3095 } u;
3096 int tmp;
3097 struct net2280_request *req;
3098
3099 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3100 u32 val = readl(&dev->usb->usbstat);
3101 if (val & BIT(SUPER_SPEED)) {
3102 dev->gadget.speed = USB_SPEED_SUPER;
3103 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3104 EP0_SS_MAX_PACKET_SIZE);
3105 } else if (val & BIT(HIGH_SPEED)) {
3106 dev->gadget.speed = USB_SPEED_HIGH;
3107 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3108 EP0_HS_MAX_PACKET_SIZE);
3109 } else {
3110 dev->gadget.speed = USB_SPEED_FULL;
3111 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3112 EP0_HS_MAX_PACKET_SIZE);
3113 }
3114 net2280_led_speed(dev, dev->gadget.speed);
3115 ep_dbg(dev, "%s\n",
3116 usb_speed_string(dev->gadget.speed));
3117 }
3118
3119 ep = &dev->ep[0];
3120 ep->irqs++;
3121
3122 /* make sure any leftover request state is cleared */
3123 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3124 while (!list_empty(&ep->queue)) {
3125 req = list_entry(ep->queue.next,
3126 struct net2280_request, queue);
3127 done(ep, req, (req->req.actual == req->req.length)
3128 ? 0 : -EPROTO);
3129 }
3130 ep->stopped = 0;
3131 dev->protocol_stall = 0;
3132 if (!(dev->quirks & PLX_PCIE)) {
3133 if (ep->dev->quirks & PLX_2280)
3134 tmp = BIT(FIFO_OVERFLOW) |
3135 BIT(FIFO_UNDERFLOW);
3136 else
3137 tmp = 0;
3138
3139 writel(tmp | BIT(TIMEOUT) |
3140 BIT(USB_STALL_SENT) |
3141 BIT(USB_IN_NAK_SENT) |
3142 BIT(USB_IN_ACK_RCVD) |
3143 BIT(USB_OUT_PING_NAK_SENT) |
3144 BIT(USB_OUT_ACK_SENT) |
3145 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3146 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3147 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3148 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3149 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3150 BIT(DATA_IN_TOKEN_INTERRUPT),
3151 &ep->regs->ep_stat);
3152 }
3153 u.raw[0] = readl(&dev->usb->setup0123);
3154 u.raw[1] = readl(&dev->usb->setup4567);
3155
3156 cpu_to_le32s(&u.raw[0]);
3157 cpu_to_le32s(&u.raw[1]);
3158
3159 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
3160 defect7374_workaround(dev, u.r);
3161
3162 tmp = 0;
3163
3164 #define w_value le16_to_cpu(u.r.wValue)
3165 #define w_index le16_to_cpu(u.r.wIndex)
3166 #define w_length le16_to_cpu(u.r.wLength)
3167
3168 /* ack the irq */
3169 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3170 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3171
3172 /* watch control traffic at the token level, and force
3173 * synchronization before letting the status stage happen.
3174 * FIXME ignore tokens we'll NAK, until driver responds.
3175 * that'll mean a lot less irqs for some drivers.
3176 */
3177 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3178 if (ep->is_in) {
3179 scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3180 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3181 BIT(DATA_IN_TOKEN_INTERRUPT);
3182 stop_out_naking(ep);
3183 } else
3184 scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3185 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3186 BIT(DATA_IN_TOKEN_INTERRUPT);
3187 writel(scratch, &dev->epregs[0].ep_irqenb);
3188
3189 /* we made the hardware handle most lowlevel requests;
3190 * everything else goes uplevel to the gadget code.
3191 */
3192 ep->responded = 1;
3193
3194 if (dev->gadget.speed == USB_SPEED_SUPER) {
3195 handle_stat0_irqs_superspeed(dev, ep, u.r);
3196 goto next_endpoints;
3197 }
3198
3199 switch (u.r.bRequest) {
3200 case USB_REQ_GET_STATUS: {
3201 struct net2280_ep *e;
3202 __le32 status;
3203
3204 /* hw handles device and interface status */
3205 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3206 goto delegate;
3207 e = get_ep_by_addr(dev, w_index);
3208 if (!e || w_length > 2)
3209 goto do_stall;
3210
3211 if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3212 status = cpu_to_le32(1);
3213 else
3214 status = cpu_to_le32(0);
3215
3216 /* don't bother with a request object! */
3217 writel(0, &dev->epregs[0].ep_irqenb);
3218 set_fifo_bytecount(ep, w_length);
3219 writel((__force u32)status, &dev->epregs[0].ep_data);
3220 allow_status(ep);
3221 ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3222 goto next_endpoints;
3223 }
3224 break;
3225 case USB_REQ_CLEAR_FEATURE: {
3226 struct net2280_ep *e;
3227
3228 /* hw handles device features */
3229 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3230 goto delegate;
3231 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3232 goto do_stall;
3233 e = get_ep_by_addr(dev, w_index);
3234 if (!e)
3235 goto do_stall;
3236 if (e->wedged) {
3237 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3238 ep->ep.name);
3239 } else {
3240 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3241 clear_halt(e);
3242 if ((ep->dev->quirks & PLX_PCIE) &&
3243 !list_empty(&e->queue) && e->td_dma)
3244 restart_dma(e);
3245 }
3246 allow_status(ep);
3247 goto next_endpoints;
3248 }
3249 break;
3250 case USB_REQ_SET_FEATURE: {
3251 struct net2280_ep *e;
3252
3253 /* hw handles device features */
3254 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3255 goto delegate;
3256 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3257 goto do_stall;
3258 e = get_ep_by_addr(dev, w_index);
3259 if (!e)
3260 goto do_stall;
3261 if (e->ep.name == ep0name)
3262 goto do_stall;
3263 set_halt(e);
3264 if ((dev->quirks & PLX_PCIE) && e->dma)
3265 abort_dma(e);
3266 allow_status(ep);
3267 ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3268 goto next_endpoints;
3269 }
3270 break;
3271 default:
3272 delegate:
3273 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3274 "ep_cfg %08x\n",
3275 u.r.bRequestType, u.r.bRequest,
3276 w_value, w_index, w_length,
3277 readl(&ep->cfg->ep_cfg));
3278 ep->responded = 0;
3279 spin_unlock(&dev->lock);
3280 tmp = dev->driver->setup(&dev->gadget, &u.r);
3281 spin_lock(&dev->lock);
3282 }
3283
3284 /* stall ep0 on error */
3285 if (tmp < 0) {
3286 do_stall:
3287 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3288 u.r.bRequestType, u.r.bRequest, tmp);
3289 dev->protocol_stall = 1;
3290 }
3291
3292 /* some in/out token irq should follow; maybe stall then.
3293 * driver must queue a request (even zlp) or halt ep0
3294 * before the host times out.
3295 */
3296 }
3297
3298 #undef w_value
3299 #undef w_index
3300 #undef w_length
3301
3302 next_endpoints:
3303 if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
3304 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3305 USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3306 USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3307
3308 if (stat & mask) {
3309 usb338x_handle_ep_intr(dev, stat & mask);
3310 stat &= ~mask;
3311 }
3312 } else {
3313 /* endpoint data irq ? */
3314 scratch = stat & 0x7f;
3315 stat &= ~0x7f;
3316 for (num = 0; scratch; num++) {
3317 u32 t;
3318
3319 /* do this endpoint's FIFO and queue need tending? */
3320 t = BIT(num);
3321 if ((scratch & t) == 0)
3322 continue;
3323 scratch ^= t;
3324
3325 ep = &dev->ep[num];
3326 handle_ep_small(ep);
3327 }
3328 }
3329
3330 if (stat)
3331 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3332 }
3333
3334 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3335 BIT(DMA_C_INTERRUPT) | \
3336 BIT(DMA_B_INTERRUPT) | \
3337 BIT(DMA_A_INTERRUPT))
3338 #define PCI_ERROR_INTERRUPTS ( \
3339 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3340 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3341 BIT(PCI_RETRY_ABORT_INTERRUPT))
3342
3343 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3344 {
3345 struct net2280_ep *ep;
3346 u32 tmp, num, mask, scratch;
3347
3348 /* after disconnect there's nothing else to do! */
3349 tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3350 mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3351
3352 /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3353 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3354 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3355 * only indicates a change in the reset state).
3356 */
3357 if (stat & tmp) {
3358 bool reset = false;
3359 bool disconnect = false;
3360
3361 /*
3362 * Ignore disconnects and resets if the speed hasn't been set.
3363 * VBUS can bounce and there's always an initial reset.
3364 */
3365 writel(tmp, &dev->regs->irqstat1);
3366 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3367 if ((stat & BIT(VBUS_INTERRUPT)) &&
3368 (readl(&dev->usb->usbctl) &
3369 BIT(VBUS_PIN)) == 0) {
3370 disconnect = true;
3371 ep_dbg(dev, "disconnect %s\n",
3372 dev->driver->driver.name);
3373 } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3374 (readl(&dev->usb->usbstat) & mask)
3375 == 0) {
3376 reset = true;
3377 ep_dbg(dev, "reset %s\n",
3378 dev->driver->driver.name);
3379 }
3380
3381 if (disconnect || reset) {
3382 stop_activity(dev, dev->driver);
3383 ep0_start(dev);
3384 if (reset)
3385 usb_gadget_udc_reset
3386 (&dev->gadget, dev->driver);
3387 else
3388 (dev->driver->disconnect)
3389 (&dev->gadget);
3390 return;
3391 }
3392 }
3393 stat &= ~tmp;
3394
3395 /* vBUS can bounce ... one of many reasons to ignore the
3396 * notion of hotplug events on bus connect/disconnect!
3397 */
3398 if (!stat)
3399 return;
3400 }
3401
3402 /* NOTE: chip stays in PCI D0 state for now, but it could
3403 * enter D1 to save more power
3404 */
3405 tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3406 if (stat & tmp) {
3407 writel(tmp, &dev->regs->irqstat1);
3408 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3409 if (dev->driver->suspend)
3410 dev->driver->suspend(&dev->gadget);
3411 if (!enable_suspend)
3412 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3413 } else {
3414 if (dev->driver->resume)
3415 dev->driver->resume(&dev->gadget);
3416 /* at high speed, note erratum 0133 */
3417 }
3418 stat &= ~tmp;
3419 }
3420
3421 /* clear any other status/irqs */
3422 if (stat)
3423 writel(stat, &dev->regs->irqstat1);
3424
3425 /* some status we can just ignore */
3426 if (dev->quirks & PLX_2280)
3427 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3428 BIT(SUSPEND_REQUEST_INTERRUPT) |
3429 BIT(RESUME_INTERRUPT) |
3430 BIT(SOF_INTERRUPT));
3431 else
3432 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3433 BIT(RESUME_INTERRUPT) |
3434 BIT(SOF_DOWN_INTERRUPT) |
3435 BIT(SOF_INTERRUPT));
3436
3437 if (!stat)
3438 return;
3439 /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3440
3441 /* DMA status, for ep-{a,b,c,d} */
3442 scratch = stat & DMA_INTERRUPTS;
3443 stat &= ~DMA_INTERRUPTS;
3444 scratch >>= 9;
3445 for (num = 0; scratch; num++) {
3446 struct net2280_dma_regs __iomem *dma;
3447
3448 tmp = BIT(num);
3449 if ((tmp & scratch) == 0)
3450 continue;
3451 scratch ^= tmp;
3452
3453 ep = &dev->ep[num + 1];
3454 dma = ep->dma;
3455
3456 if (!dma)
3457 continue;
3458
3459 /* clear ep's dma status */
3460 tmp = readl(&dma->dmastat);
3461 writel(tmp, &dma->dmastat);
3462
3463 /* dma sync*/
3464 if (dev->quirks & PLX_PCIE) {
3465 u32 r_dmacount = readl(&dma->dmacount);
3466 if (!ep->is_in && (r_dmacount & 0x00FFFFFF) &&
3467 (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3468 continue;
3469 }
3470
3471 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3472 ep_dbg(ep->dev, "%s no xact done? %08x\n",
3473 ep->ep.name, tmp);
3474 continue;
3475 }
3476 stop_dma(ep->dma);
3477
3478 /* OUT transfers terminate when the data from the
3479 * host is in our memory. Process whatever's done.
3480 * On this path, we know transfer's last packet wasn't
3481 * less than req->length. NAK_OUT_PACKETS may be set,
3482 * or the FIFO may already be holding new packets.
3483 *
3484 * IN transfers can linger in the FIFO for a very
3485 * long time ... we ignore that for now, accounting
3486 * precisely (like PIO does) needs per-packet irqs
3487 */
3488 scan_dma_completions(ep);
3489
3490 /* disable dma on inactive queues; else maybe restart */
3491 if (!list_empty(&ep->queue)) {
3492 tmp = readl(&dma->dmactl);
3493 restart_dma(ep);
3494 }
3495 ep->irqs++;
3496 }
3497
3498 /* NOTE: there are other PCI errors we might usefully notice.
3499 * if they appear very often, here's where to try recovering.
3500 */
3501 if (stat & PCI_ERROR_INTERRUPTS) {
3502 ep_err(dev, "pci dma error; stat %08x\n", stat);
3503 stat &= ~PCI_ERROR_INTERRUPTS;
3504 /* these are fatal errors, but "maybe" they won't
3505 * happen again ...
3506 */
3507 stop_activity(dev, dev->driver);
3508 ep0_start(dev);
3509 stat = 0;
3510 }
3511
3512 if (stat)
3513 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3514 }
3515
3516 static irqreturn_t net2280_irq(int irq, void *_dev)
3517 {
3518 struct net2280 *dev = _dev;
3519
3520 /* shared interrupt, not ours */
3521 if ((dev->quirks & PLX_LEGACY) &&
3522 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3523 return IRQ_NONE;
3524
3525 spin_lock(&dev->lock);
3526
3527 /* handle disconnect, dma, and more */
3528 handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3529
3530 /* control requests and PIO */
3531 handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3532
3533 if (dev->quirks & PLX_PCIE) {
3534 /* re-enable interrupt to trigger any possible new interrupt */
3535 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3536 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3537 writel(pciirqenb1, &dev->regs->pciirqenb1);
3538 }
3539
3540 spin_unlock(&dev->lock);
3541
3542 return IRQ_HANDLED;
3543 }
3544
3545 /*-------------------------------------------------------------------------*/
3546
3547 static void gadget_release(struct device *_dev)
3548 {
3549 struct net2280 *dev = dev_get_drvdata(_dev);
3550
3551 kfree(dev);
3552 }
3553
3554 /* tear down the binding between this driver and the pci device */
3555
3556 static void net2280_remove(struct pci_dev *pdev)
3557 {
3558 struct net2280 *dev = pci_get_drvdata(pdev);
3559
3560 usb_del_gadget_udc(&dev->gadget);
3561
3562 BUG_ON(dev->driver);
3563
3564 /* then clean up the resources we allocated during probe() */
3565 if (dev->requests) {
3566 int i;
3567 for (i = 1; i < 5; i++) {
3568 if (!dev->ep[i].dummy)
3569 continue;
3570 dma_pool_free(dev->requests, dev->ep[i].dummy,
3571 dev->ep[i].td_dma);
3572 }
3573 dma_pool_destroy(dev->requests);
3574 }
3575 if (dev->got_irq)
3576 free_irq(pdev->irq, dev);
3577 if (dev->quirks & PLX_PCIE)
3578 pci_disable_msi(pdev);
3579 if (dev->regs) {
3580 net2280_led_shutdown(dev);
3581 iounmap(dev->regs);
3582 }
3583 if (dev->region)
3584 release_mem_region(pci_resource_start(pdev, 0),
3585 pci_resource_len(pdev, 0));
3586 if (dev->enabled)
3587 pci_disable_device(pdev);
3588 device_remove_file(&pdev->dev, &dev_attr_registers);
3589
3590 ep_info(dev, "unbind\n");
3591 }
3592
3593 /* wrap this driver around the specified device, but
3594 * don't respond over USB until a gadget driver binds to us.
3595 */
3596
3597 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3598 {
3599 struct net2280 *dev;
3600 unsigned long resource, len;
3601 void __iomem *base = NULL;
3602 int retval, i;
3603
3604 /* alloc, and start init */
3605 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3606 if (dev == NULL) {
3607 retval = -ENOMEM;
3608 goto done;
3609 }
3610
3611 pci_set_drvdata(pdev, dev);
3612 spin_lock_init(&dev->lock);
3613 dev->quirks = id->driver_data;
3614 dev->pdev = pdev;
3615 dev->gadget.ops = &net2280_ops;
3616 dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3617 USB_SPEED_SUPER : USB_SPEED_HIGH;
3618
3619 /* the "gadget" abstracts/virtualizes the controller */
3620 dev->gadget.name = driver_name;
3621
3622 /* now all the pci goodies ... */
3623 if (pci_enable_device(pdev) < 0) {
3624 retval = -ENODEV;
3625 goto done;
3626 }
3627 dev->enabled = 1;
3628
3629 /* BAR 0 holds all the registers
3630 * BAR 1 is 8051 memory; unused here (note erratum 0103)
3631 * BAR 2 is fifo memory; unused here
3632 */
3633 resource = pci_resource_start(pdev, 0);
3634 len = pci_resource_len(pdev, 0);
3635 if (!request_mem_region(resource, len, driver_name)) {
3636 ep_dbg(dev, "controller already in use\n");
3637 retval = -EBUSY;
3638 goto done;
3639 }
3640 dev->region = 1;
3641
3642 /* FIXME provide firmware download interface to put
3643 * 8051 code into the chip, e.g. to turn on PCI PM.
3644 */
3645
3646 base = ioremap_nocache(resource, len);
3647 if (base == NULL) {
3648 ep_dbg(dev, "can't map memory\n");
3649 retval = -EFAULT;
3650 goto done;
3651 }
3652 dev->regs = (struct net2280_regs __iomem *) base;
3653 dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3654 dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3655 dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3656 dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3657 dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3658
3659 if (dev->quirks & PLX_PCIE) {
3660 u32 fsmvalue;
3661 u32 usbstat;
3662 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3663 (base + 0x00b4);
3664 dev->llregs = (struct usb338x_ll_regs __iomem *)
3665 (base + 0x0700);
3666 dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
3667 (base + 0x0748);
3668 dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
3669 (base + 0x077c);
3670 dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
3671 (base + 0x079c);
3672 dev->plregs = (struct usb338x_pl_regs __iomem *)
3673 (base + 0x0800);
3674 usbstat = readl(&dev->usb->usbstat);
3675 dev->enhanced_mode = !!(usbstat & BIT(11));
3676 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3677 /* put into initial config, link up all endpoints */
3678 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3679 (0xf << DEFECT7374_FSM_FIELD);
3680 /* See if firmware needs to set up for workaround: */
3681 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3682 dev->bug7734_patched = 1;
3683 writel(0, &dev->usb->usbctl);
3684 } else
3685 dev->bug7734_patched = 0;
3686 } else {
3687 dev->enhanced_mode = 0;
3688 dev->n_ep = 7;
3689 /* put into initial config, link up all endpoints */
3690 writel(0, &dev->usb->usbctl);
3691 }
3692
3693 usb_reset(dev);
3694 usb_reinit(dev);
3695
3696 /* irq setup after old hardware is cleaned up */
3697 if (!pdev->irq) {
3698 ep_err(dev, "No IRQ. Check PCI setup!\n");
3699 retval = -ENODEV;
3700 goto done;
3701 }
3702
3703 if (dev->quirks & PLX_PCIE)
3704 if (pci_enable_msi(pdev))
3705 ep_err(dev, "Failed to enable MSI mode\n");
3706
3707 if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3708 driver_name, dev)) {
3709 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3710 retval = -EBUSY;
3711 goto done;
3712 }
3713 dev->got_irq = 1;
3714
3715 /* DMA setup */
3716 /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */
3717 dev->requests = dma_pool_create("requests", &pdev->dev,
3718 sizeof(struct net2280_dma),
3719 0 /* no alignment requirements */,
3720 0 /* or page-crossing issues */);
3721 if (!dev->requests) {
3722 ep_dbg(dev, "can't get request pool\n");
3723 retval = -ENOMEM;
3724 goto done;
3725 }
3726 for (i = 1; i < 5; i++) {
3727 struct net2280_dma *td;
3728
3729 td = dma_pool_alloc(dev->requests, GFP_KERNEL,
3730 &dev->ep[i].td_dma);
3731 if (!td) {
3732 ep_dbg(dev, "can't get dummy %d\n", i);
3733 retval = -ENOMEM;
3734 goto done;
3735 }
3736 td->dmacount = 0; /* not VALID */
3737 td->dmadesc = td->dmaaddr;
3738 dev->ep[i].dummy = td;
3739 }
3740
3741 /* enable lower-overhead pci memory bursts during DMA */
3742 if (dev->quirks & PLX_LEGACY)
3743 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3744 /*
3745 * 256 write retries may not be enough...
3746 BIT(PCI_RETRY_ABORT_ENABLE) |
3747 */
3748 BIT(DMA_READ_MULTIPLE_ENABLE) |
3749 BIT(DMA_READ_LINE_ENABLE),
3750 &dev->pci->pcimstctl);
3751 /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3752 pci_set_master(pdev);
3753 pci_try_set_mwi(pdev);
3754
3755 /* ... also flushes any posted pci writes */
3756 dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3757
3758 /* done */
3759 ep_info(dev, "%s\n", driver_desc);
3760 ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3761 pdev->irq, base, dev->chiprev);
3762 ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3763 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3764 retval = device_create_file(&pdev->dev, &dev_attr_registers);
3765 if (retval)
3766 goto done;
3767
3768 retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
3769 gadget_release);
3770 if (retval)
3771 goto done;
3772 return 0;
3773
3774 done:
3775 if (dev)
3776 net2280_remove(pdev);
3777 return retval;
3778 }
3779
3780 /* make sure the board is quiescent; otherwise it will continue
3781 * generating IRQs across the upcoming reboot.
3782 */
3783
3784 static void net2280_shutdown(struct pci_dev *pdev)
3785 {
3786 struct net2280 *dev = pci_get_drvdata(pdev);
3787
3788 /* disable IRQs */
3789 writel(0, &dev->regs->pciirqenb0);
3790 writel(0, &dev->regs->pciirqenb1);
3791
3792 /* disable the pullup so the host will think we're gone */
3793 writel(0, &dev->usb->usbctl);
3794
3795 }
3796
3797
3798 /*-------------------------------------------------------------------------*/
3799
3800 static const struct pci_device_id pci_ids[] = { {
3801 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3802 .class_mask = ~0,
3803 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3804 .device = 0x2280,
3805 .subvendor = PCI_ANY_ID,
3806 .subdevice = PCI_ANY_ID,
3807 .driver_data = PLX_LEGACY | PLX_2280,
3808 }, {
3809 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3810 .class_mask = ~0,
3811 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3812 .device = 0x2282,
3813 .subvendor = PCI_ANY_ID,
3814 .subdevice = PCI_ANY_ID,
3815 .driver_data = PLX_LEGACY,
3816 },
3817 {
3818 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3819 .class_mask = ~0,
3820 .vendor = PCI_VENDOR_ID_PLX,
3821 .device = 0x2380,
3822 .subvendor = PCI_ANY_ID,
3823 .subdevice = PCI_ANY_ID,
3824 .driver_data = PLX_PCIE,
3825 },
3826 {
3827 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3828 .class_mask = ~0,
3829 .vendor = PCI_VENDOR_ID_PLX,
3830 .device = 0x3380,
3831 .subvendor = PCI_ANY_ID,
3832 .subdevice = PCI_ANY_ID,
3833 .driver_data = PLX_PCIE | PLX_SUPERSPEED,
3834 },
3835 {
3836 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3837 .class_mask = ~0,
3838 .vendor = PCI_VENDOR_ID_PLX,
3839 .device = 0x3382,
3840 .subvendor = PCI_ANY_ID,
3841 .subdevice = PCI_ANY_ID,
3842 .driver_data = PLX_PCIE | PLX_SUPERSPEED,
3843 },
3844 { /* end: all zeroes */ }
3845 };
3846 MODULE_DEVICE_TABLE(pci, pci_ids);
3847
3848 /* pci driver glue; this is a "new style" PCI driver module */
3849 static struct pci_driver net2280_pci_driver = {
3850 .name = (char *) driver_name,
3851 .id_table = pci_ids,
3852
3853 .probe = net2280_probe,
3854 .remove = net2280_remove,
3855 .shutdown = net2280_shutdown,
3856
3857 /* FIXME add power management support */
3858 };
3859
3860 module_pci_driver(net2280_pci_driver);
3861
3862 MODULE_DESCRIPTION(DRIVER_DESC);
3863 MODULE_AUTHOR("David Brownell");
3864 MODULE_LICENSE("GPL");
Linux with added FPC-III support