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
type_string(u8 bmAttributes)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 /*-------------------------------------------------------------------------*/
enable_pciirqenb(struct net2280_ep * ep)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
net2280_enable(struct usb_ep * _ep,const struct usb_endpoint_descriptor * desc)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
handshake(u32 __iomem * ptr,u32 mask,u32 done,int usec)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
ep_reset_228x(struct net2280_regs __iomem * regs,struct net2280_ep * ep)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(®s->pciirqenb0);
399 tmp &= ~BIT(ep->num);
400 writel(tmp, ®s->pciirqenb0);
401 } else {
402 tmp = readl(®s->pciirqenb1);
403 tmp &= ~BIT((8 + ep->num)); /* completion */
404 writel(tmp, ®s->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
ep_reset_338x(struct net2280_regs __iomem * regs,struct net2280_ep * ep)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(®s->pciirqenb0);
484 tmp &= ~BIT(ep_bit[ep->num]);
485 writel(tmp, ®s->pciirqenb0);
486 } else {
487 if (ep->num < 5) {
488 tmp = readl(®s->pciirqenb1);
489 tmp &= ~BIT((8 + ep->num)); /* completion */
490 writel(tmp, ®s->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
net2280_disable(struct usb_ep * _ep)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
net2280_alloc_request(struct usb_ep * _ep,gfp_t gfp_flags)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
net2280_free_request(struct usb_ep * _ep,struct usb_request * _req)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 */
write_fifo(struct net2280_ep * ep,struct usb_request * req)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, ®s->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, ®s->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 */
out_flush(struct net2280_ep * ep)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 */
read_fifo(struct net2280_ep * ep,struct net2280_request * req)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(®s->ep_avail);
737 if (unlikely(count == 0)) {
738 udelay(1);
739 tmp = readl(&ep->regs->ep_stat);
740 count = readl(®s->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(®s->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(®s->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 */
fill_dma_desc(struct net2280_ep * ep,struct net2280_request * req,int valid)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
spin_stop_dma(struct net2280_dma_regs __iomem * dma)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
stop_dma(struct net2280_dma_regs __iomem * dma)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
start_queue(struct net2280_ep * ep,u32 dmactl,u32 td_dma)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
start_dma(struct net2280_ep * ep,struct net2280_request * req)871 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
872 {
873 u32 tmp;
874 struct net2280_dma_regs __iomem *dma = ep->dma;
875
876 /* FIXME can't use DMA for ZLPs */
877
878 /* on this path we "know" there's no dma active (yet) */
879 WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
880 writel(0, &ep->dma->dmactl);
881
882 /* previous OUT packet might have been short */
883 if (!ep->is_in && (readl(&ep->regs->ep_stat) &
884 BIT(NAK_OUT_PACKETS))) {
885 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
886 &ep->regs->ep_stat);
887
888 tmp = readl(&ep->regs->ep_avail);
889 if (tmp) {
890 writel(readl(&dma->dmastat), &dma->dmastat);
891
892 /* transfer all/some fifo data */
893 writel(req->req.dma, &dma->dmaaddr);
894 tmp = min(tmp, req->req.length);
895
896 /* dma irq, faking scatterlist status */
897 req->td->dmacount = cpu_to_le32(req->req.length - tmp);
898 writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
899 &dma->dmacount);
900 req->td->dmadesc = 0;
901 req->valid = 1;
902
903 writel(BIT(DMA_ENABLE), &dma->dmactl);
904 writel(BIT(DMA_START), &dma->dmastat);
905 return;
906 }
907 stop_out_naking(ep);
908 }
909
910 tmp = dmactl_default;
911
912 /* force packet boundaries between dma requests, but prevent the
913 * controller from automagically writing a last "short" packet
914 * (zero length) unless the driver explicitly said to do that.
915 */
916 if (ep->is_in) {
917 if (likely((req->req.length % ep->ep.maxpacket) ||
918 req->req.zero)){
919 tmp |= BIT(DMA_FIFO_VALIDATE);
920 ep->in_fifo_validate = 1;
921 } else
922 ep->in_fifo_validate = 0;
923 }
924
925 /* init req->td, pointing to the current dummy */
926 req->td->dmadesc = cpu_to_le32 (ep->td_dma);
927 fill_dma_desc(ep, req, 1);
928
929 req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
930
931 start_queue(ep, tmp, req->td_dma);
932 }
933
934 static inline void
queue_dma(struct net2280_ep * ep,struct net2280_request * req,int valid)935 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
936 {
937 struct net2280_dma *end;
938 dma_addr_t tmp;
939
940 /* swap new dummy for old, link; fill and maybe activate */
941 end = ep->dummy;
942 ep->dummy = req->td;
943 req->td = end;
944
945 tmp = ep->td_dma;
946 ep->td_dma = req->td_dma;
947 req->td_dma = tmp;
948
949 end->dmadesc = cpu_to_le32 (ep->td_dma);
950
951 fill_dma_desc(ep, req, valid);
952 }
953
954 static void
done(struct net2280_ep * ep,struct net2280_request * req,int status)955 done(struct net2280_ep *ep, struct net2280_request *req, int status)
956 {
957 struct net2280 *dev;
958 unsigned stopped = ep->stopped;
959
960 list_del_init(&req->queue);
961
962 if (req->req.status == -EINPROGRESS)
963 req->req.status = status;
964 else
965 status = req->req.status;
966
967 dev = ep->dev;
968 if (ep->dma)
969 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
970
971 if (status && status != -ESHUTDOWN)
972 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
973 ep->ep.name, &req->req, status,
974 req->req.actual, req->req.length);
975
976 /* don't modify queue heads during completion callback */
977 ep->stopped = 1;
978 spin_unlock(&dev->lock);
979 usb_gadget_giveback_request(&ep->ep, &req->req);
980 spin_lock(&dev->lock);
981 ep->stopped = stopped;
982 }
983
984 /*-------------------------------------------------------------------------*/
985
986 static int
net2280_queue(struct usb_ep * _ep,struct usb_request * _req,gfp_t gfp_flags)987 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
988 {
989 struct net2280_request *req;
990 struct net2280_ep *ep;
991 struct net2280 *dev;
992 unsigned long flags;
993 int ret = 0;
994
995 /* we always require a cpu-view buffer, so that we can
996 * always use pio (as fallback or whatever).
997 */
998 ep = container_of(_ep, struct net2280_ep, ep);
999 if (!_ep || (!ep->desc && ep->num != 0)) {
1000 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1001 return -EINVAL;
1002 }
1003 req = container_of(_req, struct net2280_request, req);
1004 if (!_req || !_req->complete || !_req->buf ||
1005 !list_empty(&req->queue)) {
1006 ret = -EINVAL;
1007 goto print_err;
1008 }
1009 if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1010 ret = -EDOM;
1011 goto print_err;
1012 }
1013 dev = ep->dev;
1014 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1015 ret = -ESHUTDOWN;
1016 goto print_err;
1017 }
1018
1019 /* FIXME implement PIO fallback for ZLPs with DMA */
1020 if (ep->dma && _req->length == 0) {
1021 ret = -EOPNOTSUPP;
1022 goto print_err;
1023 }
1024
1025 /* set up dma mapping in case the caller didn't */
1026 if (ep->dma) {
1027 ret = usb_gadget_map_request(&dev->gadget, _req,
1028 ep->is_in);
1029 if (ret)
1030 goto print_err;
1031 }
1032
1033 ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1034 _ep->name, _req, _req->length, _req->buf);
1035
1036 spin_lock_irqsave(&dev->lock, flags);
1037
1038 _req->status = -EINPROGRESS;
1039 _req->actual = 0;
1040
1041 /* kickstart this i/o queue? */
1042 if (list_empty(&ep->queue) && !ep->stopped &&
1043 !((dev->quirks & PLX_PCIE) && ep->dma &&
1044 (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1045
1046 /* use DMA if the endpoint supports it, else pio */
1047 if (ep->dma)
1048 start_dma(ep, req);
1049 else {
1050 /* maybe there's no control data, just status ack */
1051 if (ep->num == 0 && _req->length == 0) {
1052 allow_status(ep);
1053 done(ep, req, 0);
1054 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1055 goto done;
1056 }
1057
1058 /* PIO ... stuff the fifo, or unblock it. */
1059 if (ep->is_in)
1060 write_fifo(ep, _req);
1061 else if (list_empty(&ep->queue)) {
1062 u32 s;
1063
1064 /* OUT FIFO might have packet(s) buffered */
1065 s = readl(&ep->regs->ep_stat);
1066 if ((s & BIT(FIFO_EMPTY)) == 0) {
1067 /* note: _req->short_not_ok is
1068 * ignored here since PIO _always_
1069 * stops queue advance here, and
1070 * _req->status doesn't change for
1071 * short reads (only _req->actual)
1072 */
1073 if (read_fifo(ep, req) &&
1074 ep->num == 0) {
1075 done(ep, req, 0);
1076 allow_status(ep);
1077 /* don't queue it */
1078 req = NULL;
1079 } else if (read_fifo(ep, req) &&
1080 ep->num != 0) {
1081 done(ep, req, 0);
1082 req = NULL;
1083 } else
1084 s = readl(&ep->regs->ep_stat);
1085 }
1086
1087 /* don't NAK, let the fifo fill */
1088 if (req && (s & BIT(NAK_OUT_PACKETS)))
1089 writel(BIT(CLEAR_NAK_OUT_PACKETS),
1090 &ep->regs->ep_rsp);
1091 }
1092 }
1093
1094 } else if (ep->dma) {
1095 int valid = 1;
1096
1097 if (ep->is_in) {
1098 int expect;
1099
1100 /* preventing magic zlps is per-engine state, not
1101 * per-transfer; irq logic must recover hiccups.
1102 */
1103 expect = likely(req->req.zero ||
1104 (req->req.length % ep->ep.maxpacket));
1105 if (expect != ep->in_fifo_validate)
1106 valid = 0;
1107 }
1108 queue_dma(ep, req, valid);
1109
1110 } /* else the irq handler advances the queue. */
1111
1112 ep->responded = 1;
1113 if (req)
1114 list_add_tail(&req->queue, &ep->queue);
1115 done:
1116 spin_unlock_irqrestore(&dev->lock, flags);
1117
1118 /* pci writes may still be posted */
1119 return ret;
1120
1121 print_err:
1122 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1123 return ret;
1124 }
1125
1126 static inline void
dma_done(struct net2280_ep * ep,struct net2280_request * req,u32 dmacount,int status)1127 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1128 int status)
1129 {
1130 req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1131 done(ep, req, status);
1132 }
1133
scan_dma_completions(struct net2280_ep * ep)1134 static int scan_dma_completions(struct net2280_ep *ep)
1135 {
1136 int num_completed = 0;
1137
1138 /* only look at descriptors that were "naturally" retired,
1139 * so fifo and list head state won't matter
1140 */
1141 while (!list_empty(&ep->queue)) {
1142 struct net2280_request *req;
1143 u32 req_dma_count;
1144
1145 req = list_entry(ep->queue.next,
1146 struct net2280_request, queue);
1147 if (!req->valid)
1148 break;
1149 rmb();
1150 req_dma_count = le32_to_cpup(&req->td->dmacount);
1151 if ((req_dma_count & BIT(VALID_BIT)) != 0)
1152 break;
1153
1154 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1155 * cases where DMA must be aborted; this code handles
1156 * all non-abort DMA completions.
1157 */
1158 if (unlikely(req->td->dmadesc == 0)) {
1159 /* paranoia */
1160 u32 const ep_dmacount = readl(&ep->dma->dmacount);
1161
1162 if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1163 break;
1164 /* single transfer mode */
1165 dma_done(ep, req, req_dma_count, 0);
1166 num_completed++;
1167 break;
1168 } else if (!ep->is_in &&
1169 (req->req.length % ep->ep.maxpacket) &&
1170 !(ep->dev->quirks & PLX_PCIE)) {
1171
1172 u32 const ep_stat = readl(&ep->regs->ep_stat);
1173 /* AVOID TROUBLE HERE by not issuing short reads from
1174 * your gadget driver. That helps avoids errata 0121,
1175 * 0122, and 0124; not all cases trigger the warning.
1176 */
1177 if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) {
1178 ep_warn(ep->dev, "%s lost packet sync!\n",
1179 ep->ep.name);
1180 req->req.status = -EOVERFLOW;
1181 } else {
1182 u32 const ep_avail = readl(&ep->regs->ep_avail);
1183 if (ep_avail) {
1184 /* fifo gets flushed later */
1185 ep->out_overflow = 1;
1186 ep_dbg(ep->dev,
1187 "%s dma, discard %d len %d\n",
1188 ep->ep.name, ep_avail,
1189 req->req.length);
1190 req->req.status = -EOVERFLOW;
1191 }
1192 }
1193 }
1194 dma_done(ep, req, req_dma_count, 0);
1195 num_completed++;
1196 }
1197
1198 return num_completed;
1199 }
1200
restart_dma(struct net2280_ep * ep)1201 static void restart_dma(struct net2280_ep *ep)
1202 {
1203 struct net2280_request *req;
1204
1205 if (ep->stopped)
1206 return;
1207 req = list_entry(ep->queue.next, struct net2280_request, queue);
1208
1209 start_dma(ep, req);
1210 }
1211
abort_dma(struct net2280_ep * ep)1212 static void abort_dma(struct net2280_ep *ep)
1213 {
1214 /* abort the current transfer */
1215 if (likely(!list_empty(&ep->queue))) {
1216 /* FIXME work around errata 0121, 0122, 0124 */
1217 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1218 spin_stop_dma(ep->dma);
1219 } else
1220 stop_dma(ep->dma);
1221 scan_dma_completions(ep);
1222 }
1223
1224 /* dequeue ALL requests */
nuke(struct net2280_ep * ep)1225 static void nuke(struct net2280_ep *ep)
1226 {
1227 struct net2280_request *req;
1228
1229 /* called with spinlock held */
1230 ep->stopped = 1;
1231 if (ep->dma)
1232 abort_dma(ep);
1233 while (!list_empty(&ep->queue)) {
1234 req = list_entry(ep->queue.next,
1235 struct net2280_request,
1236 queue);
1237 done(ep, req, -ESHUTDOWN);
1238 }
1239 }
1240
1241 /* dequeue JUST ONE request */
net2280_dequeue(struct usb_ep * _ep,struct usb_request * _req)1242 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1243 {
1244 struct net2280_ep *ep;
1245 struct net2280_request *req;
1246 unsigned long flags;
1247 u32 dmactl;
1248 int stopped;
1249
1250 ep = container_of(_ep, struct net2280_ep, ep);
1251 if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1252 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1253 __func__, _ep, _req);
1254 return -EINVAL;
1255 }
1256
1257 spin_lock_irqsave(&ep->dev->lock, flags);
1258 stopped = ep->stopped;
1259
1260 /* quiesce dma while we patch the queue */
1261 dmactl = 0;
1262 ep->stopped = 1;
1263 if (ep->dma) {
1264 dmactl = readl(&ep->dma->dmactl);
1265 /* WARNING erratum 0127 may kick in ... */
1266 stop_dma(ep->dma);
1267 scan_dma_completions(ep);
1268 }
1269
1270 /* make sure it's still queued on this endpoint */
1271 list_for_each_entry(req, &ep->queue, queue) {
1272 if (&req->req == _req)
1273 break;
1274 }
1275 if (&req->req != _req) {
1276 ep->stopped = stopped;
1277 spin_unlock_irqrestore(&ep->dev->lock, flags);
1278 ep_dbg(ep->dev, "%s: Request mismatch\n", __func__);
1279 return -EINVAL;
1280 }
1281
1282 /* queue head may be partially complete. */
1283 if (ep->queue.next == &req->queue) {
1284 if (ep->dma) {
1285 ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1286 _req->status = -ECONNRESET;
1287 abort_dma(ep);
1288 if (likely(ep->queue.next == &req->queue)) {
1289 /* NOTE: misreports single-transfer mode*/
1290 req->td->dmacount = 0; /* invalidate */
1291 dma_done(ep, req,
1292 readl(&ep->dma->dmacount),
1293 -ECONNRESET);
1294 }
1295 } else {
1296 ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1297 done(ep, req, -ECONNRESET);
1298 }
1299 req = NULL;
1300 }
1301
1302 if (req)
1303 done(ep, req, -ECONNRESET);
1304 ep->stopped = stopped;
1305
1306 if (ep->dma) {
1307 /* turn off dma on inactive queues */
1308 if (list_empty(&ep->queue))
1309 stop_dma(ep->dma);
1310 else if (!ep->stopped) {
1311 /* resume current request, or start new one */
1312 if (req)
1313 writel(dmactl, &ep->dma->dmactl);
1314 else
1315 start_dma(ep, list_entry(ep->queue.next,
1316 struct net2280_request, queue));
1317 }
1318 }
1319
1320 spin_unlock_irqrestore(&ep->dev->lock, flags);
1321 return 0;
1322 }
1323
1324 /*-------------------------------------------------------------------------*/
1325
1326 static int net2280_fifo_status(struct usb_ep *_ep);
1327
1328 static int
net2280_set_halt_and_wedge(struct usb_ep * _ep,int value,int wedged)1329 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1330 {
1331 struct net2280_ep *ep;
1332 unsigned long flags;
1333 int retval = 0;
1334
1335 ep = container_of(_ep, struct net2280_ep, ep);
1336 if (!_ep || (!ep->desc && ep->num != 0)) {
1337 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1338 return -EINVAL;
1339 }
1340 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1341 retval = -ESHUTDOWN;
1342 goto print_err;
1343 }
1344 if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1345 == USB_ENDPOINT_XFER_ISOC) {
1346 retval = -EINVAL;
1347 goto print_err;
1348 }
1349
1350 spin_lock_irqsave(&ep->dev->lock, flags);
1351 if (!list_empty(&ep->queue)) {
1352 retval = -EAGAIN;
1353 goto print_unlock;
1354 } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1355 retval = -EAGAIN;
1356 goto print_unlock;
1357 } else {
1358 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1359 value ? "set" : "clear",
1360 wedged ? "wedge" : "halt");
1361 /* set/clear, then synch memory views with the device */
1362 if (value) {
1363 if (ep->num == 0)
1364 ep->dev->protocol_stall = 1;
1365 else
1366 set_halt(ep);
1367 if (wedged)
1368 ep->wedged = 1;
1369 } else {
1370 clear_halt(ep);
1371 if (ep->dev->quirks & PLX_PCIE &&
1372 !list_empty(&ep->queue) && ep->td_dma)
1373 restart_dma(ep);
1374 ep->wedged = 0;
1375 }
1376 (void) readl(&ep->regs->ep_rsp);
1377 }
1378 spin_unlock_irqrestore(&ep->dev->lock, flags);
1379
1380 return retval;
1381
1382 print_unlock:
1383 spin_unlock_irqrestore(&ep->dev->lock, flags);
1384 print_err:
1385 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1386 return retval;
1387 }
1388
net2280_set_halt(struct usb_ep * _ep,int value)1389 static int net2280_set_halt(struct usb_ep *_ep, int value)
1390 {
1391 return net2280_set_halt_and_wedge(_ep, value, 0);
1392 }
1393
net2280_set_wedge(struct usb_ep * _ep)1394 static int net2280_set_wedge(struct usb_ep *_ep)
1395 {
1396 if (!_ep || _ep->name == ep0name) {
1397 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1398 return -EINVAL;
1399 }
1400 return net2280_set_halt_and_wedge(_ep, 1, 1);
1401 }
1402
net2280_fifo_status(struct usb_ep * _ep)1403 static int net2280_fifo_status(struct usb_ep *_ep)
1404 {
1405 struct net2280_ep *ep;
1406 u32 avail;
1407
1408 ep = container_of(_ep, struct net2280_ep, ep);
1409 if (!_ep || (!ep->desc && ep->num != 0)) {
1410 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1411 return -ENODEV;
1412 }
1413 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1414 dev_err(&ep->dev->pdev->dev,
1415 "%s: Invalid driver=%p or speed=%d\n",
1416 __func__, ep->dev->driver, ep->dev->gadget.speed);
1417 return -ESHUTDOWN;
1418 }
1419
1420 avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1421 if (avail > ep->fifo_size) {
1422 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1423 return -EOVERFLOW;
1424 }
1425 if (ep->is_in)
1426 avail = ep->fifo_size - avail;
1427 return avail;
1428 }
1429
net2280_fifo_flush(struct usb_ep * _ep)1430 static void net2280_fifo_flush(struct usb_ep *_ep)
1431 {
1432 struct net2280_ep *ep;
1433
1434 ep = container_of(_ep, struct net2280_ep, ep);
1435 if (!_ep || (!ep->desc && ep->num != 0)) {
1436 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1437 return;
1438 }
1439 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1440 dev_err(&ep->dev->pdev->dev,
1441 "%s: Invalid driver=%p or speed=%d\n",
1442 __func__, ep->dev->driver, ep->dev->gadget.speed);
1443 return;
1444 }
1445
1446 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1447 (void) readl(&ep->regs->ep_rsp);
1448 }
1449
1450 static const struct usb_ep_ops net2280_ep_ops = {
1451 .enable = net2280_enable,
1452 .disable = net2280_disable,
1453
1454 .alloc_request = net2280_alloc_request,
1455 .free_request = net2280_free_request,
1456
1457 .queue = net2280_queue,
1458 .dequeue = net2280_dequeue,
1459
1460 .set_halt = net2280_set_halt,
1461 .set_wedge = net2280_set_wedge,
1462 .fifo_status = net2280_fifo_status,
1463 .fifo_flush = net2280_fifo_flush,
1464 };
1465
1466 /*-------------------------------------------------------------------------*/
1467
net2280_get_frame(struct usb_gadget * _gadget)1468 static int net2280_get_frame(struct usb_gadget *_gadget)
1469 {
1470 struct net2280 *dev;
1471 unsigned long flags;
1472 u16 retval;
1473
1474 if (!_gadget)
1475 return -ENODEV;
1476 dev = container_of(_gadget, struct net2280, gadget);
1477 spin_lock_irqsave(&dev->lock, flags);
1478 retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1479 spin_unlock_irqrestore(&dev->lock, flags);
1480 return retval;
1481 }
1482
net2280_wakeup(struct usb_gadget * _gadget)1483 static int net2280_wakeup(struct usb_gadget *_gadget)
1484 {
1485 struct net2280 *dev;
1486 u32 tmp;
1487 unsigned long flags;
1488
1489 if (!_gadget)
1490 return 0;
1491 dev = container_of(_gadget, struct net2280, gadget);
1492
1493 spin_lock_irqsave(&dev->lock, flags);
1494 tmp = readl(&dev->usb->usbctl);
1495 if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1496 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1497 spin_unlock_irqrestore(&dev->lock, flags);
1498
1499 /* pci writes may still be posted */
1500 return 0;
1501 }
1502
net2280_set_selfpowered(struct usb_gadget * _gadget,int value)1503 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1504 {
1505 struct net2280 *dev;
1506 u32 tmp;
1507 unsigned long flags;
1508
1509 if (!_gadget)
1510 return 0;
1511 dev = container_of(_gadget, struct net2280, gadget);
1512
1513 spin_lock_irqsave(&dev->lock, flags);
1514 tmp = readl(&dev->usb->usbctl);
1515 if (value) {
1516 tmp |= BIT(SELF_POWERED_STATUS);
1517 _gadget->is_selfpowered = 1;
1518 } else {
1519 tmp &= ~BIT(SELF_POWERED_STATUS);
1520 _gadget->is_selfpowered = 0;
1521 }
1522 writel(tmp, &dev->usb->usbctl);
1523 spin_unlock_irqrestore(&dev->lock, flags);
1524
1525 return 0;
1526 }
1527
net2280_pullup(struct usb_gadget * _gadget,int is_on)1528 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1529 {
1530 struct net2280 *dev;
1531 u32 tmp;
1532 unsigned long flags;
1533
1534 if (!_gadget)
1535 return -ENODEV;
1536 dev = container_of(_gadget, struct net2280, gadget);
1537
1538 spin_lock_irqsave(&dev->lock, flags);
1539 tmp = readl(&dev->usb->usbctl);
1540 dev->softconnect = (is_on != 0);
1541 if (is_on) {
1542 ep0_start(dev);
1543 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1544 } else {
1545 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1546 stop_activity(dev, NULL);
1547 }
1548
1549 spin_unlock_irqrestore(&dev->lock, flags);
1550
1551 if (!is_on && dev->driver)
1552 dev->driver->disconnect(&dev->gadget);
1553
1554 return 0;
1555 }
1556
net2280_match_ep(struct usb_gadget * _gadget,struct usb_endpoint_descriptor * desc,struct usb_ss_ep_comp_descriptor * ep_comp)1557 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1558 struct usb_endpoint_descriptor *desc,
1559 struct usb_ss_ep_comp_descriptor *ep_comp)
1560 {
1561 char name[8];
1562 struct usb_ep *ep;
1563
1564 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1565 /* ep-e, ep-f are PIO with only 64 byte fifos */
1566 ep = gadget_find_ep_by_name(_gadget, "ep-e");
1567 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1568 return ep;
1569 ep = gadget_find_ep_by_name(_gadget, "ep-f");
1570 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1571 return ep;
1572 }
1573
1574 /* USB3380: Only first four endpoints have DMA channels. Allocate
1575 * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1576 * endpoints use DMA hw endpoints.
1577 */
1578 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1579 usb_endpoint_dir_in(desc)) {
1580 ep = gadget_find_ep_by_name(_gadget, "ep2in");
1581 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1582 return ep;
1583 ep = gadget_find_ep_by_name(_gadget, "ep4in");
1584 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1585 return ep;
1586 } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1587 !usb_endpoint_dir_in(desc)) {
1588 ep = gadget_find_ep_by_name(_gadget, "ep1out");
1589 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1590 return ep;
1591 ep = gadget_find_ep_by_name(_gadget, "ep3out");
1592 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1593 return ep;
1594 } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1595 usb_endpoint_dir_in(desc)) {
1596 ep = gadget_find_ep_by_name(_gadget, "ep1in");
1597 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1598 return ep;
1599 ep = gadget_find_ep_by_name(_gadget, "ep3in");
1600 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1601 return ep;
1602 } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1603 !usb_endpoint_dir_in(desc)) {
1604 ep = gadget_find_ep_by_name(_gadget, "ep2out");
1605 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1606 return ep;
1607 ep = gadget_find_ep_by_name(_gadget, "ep4out");
1608 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1609 return ep;
1610 }
1611
1612 /* USB3380: use same address for usb and hardware endpoints */
1613 snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1614 usb_endpoint_dir_in(desc) ? "in" : "out");
1615 ep = gadget_find_ep_by_name(_gadget, name);
1616 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1617 return ep;
1618
1619 return NULL;
1620 }
1621
1622 static int net2280_start(struct usb_gadget *_gadget,
1623 struct usb_gadget_driver *driver);
1624 static int net2280_stop(struct usb_gadget *_gadget);
1625
1626 static const struct usb_gadget_ops net2280_ops = {
1627 .get_frame = net2280_get_frame,
1628 .wakeup = net2280_wakeup,
1629 .set_selfpowered = net2280_set_selfpowered,
1630 .pullup = net2280_pullup,
1631 .udc_start = net2280_start,
1632 .udc_stop = net2280_stop,
1633 .match_ep = net2280_match_ep,
1634 };
1635
1636 /*-------------------------------------------------------------------------*/
1637
1638 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1639
1640 /* FIXME move these into procfs, and use seq_file.
1641 * Sysfs _still_ doesn't behave for arbitrarily sized files,
1642 * and also doesn't help products using this with 2.4 kernels.
1643 */
1644
1645 /* "function" sysfs attribute */
function_show(struct device * _dev,struct device_attribute * attr,char * buf)1646 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1647 char *buf)
1648 {
1649 struct net2280 *dev = dev_get_drvdata(_dev);
1650
1651 if (!dev->driver || !dev->driver->function ||
1652 strlen(dev->driver->function) > PAGE_SIZE)
1653 return 0;
1654 return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1655 }
1656 static DEVICE_ATTR_RO(function);
1657
registers_show(struct device * _dev,struct device_attribute * attr,char * buf)1658 static ssize_t registers_show(struct device *_dev,
1659 struct device_attribute *attr, char *buf)
1660 {
1661 struct net2280 *dev;
1662 char *next;
1663 unsigned size, t;
1664 unsigned long flags;
1665 int i;
1666 u32 t1, t2;
1667 const char *s;
1668
1669 dev = dev_get_drvdata(_dev);
1670 next = buf;
1671 size = PAGE_SIZE;
1672 spin_lock_irqsave(&dev->lock, flags);
1673
1674 if (dev->driver)
1675 s = dev->driver->driver.name;
1676 else
1677 s = "(none)";
1678
1679 /* Main Control Registers */
1680 t = scnprintf(next, size, "%s version " DRIVER_VERSION
1681 ", chiprev %04x\n\n"
1682 "devinit %03x fifoctl %08x gadget '%s'\n"
1683 "pci irqenb0 %02x irqenb1 %08x "
1684 "irqstat0 %04x irqstat1 %08x\n",
1685 driver_name, dev->chiprev,
1686 readl(&dev->regs->devinit),
1687 readl(&dev->regs->fifoctl),
1688 s,
1689 readl(&dev->regs->pciirqenb0),
1690 readl(&dev->regs->pciirqenb1),
1691 readl(&dev->regs->irqstat0),
1692 readl(&dev->regs->irqstat1));
1693 size -= t;
1694 next += t;
1695
1696 /* USB Control Registers */
1697 t1 = readl(&dev->usb->usbctl);
1698 t2 = readl(&dev->usb->usbstat);
1699 if (t1 & BIT(VBUS_PIN)) {
1700 if (t2 & BIT(HIGH_SPEED))
1701 s = "high speed";
1702 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1703 s = "powered";
1704 else
1705 s = "full speed";
1706 /* full speed bit (6) not working?? */
1707 } else
1708 s = "not attached";
1709 t = scnprintf(next, size,
1710 "stdrsp %08x usbctl %08x usbstat %08x "
1711 "addr 0x%02x (%s)\n",
1712 readl(&dev->usb->stdrsp), t1, t2,
1713 readl(&dev->usb->ouraddr), s);
1714 size -= t;
1715 next += t;
1716
1717 /* PCI Master Control Registers */
1718
1719 /* DMA Control Registers */
1720
1721 /* Configurable EP Control Registers */
1722 for (i = 0; i < dev->n_ep; i++) {
1723 struct net2280_ep *ep;
1724
1725 ep = &dev->ep[i];
1726 if (i && !ep->desc)
1727 continue;
1728
1729 t1 = readl(&ep->cfg->ep_cfg);
1730 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1731 t = scnprintf(next, size,
1732 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1733 "irqenb %02x\n",
1734 ep->ep.name, t1, t2,
1735 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1736 ? "NAK " : "",
1737 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1738 ? "hide " : "",
1739 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1740 ? "CRC " : "",
1741 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1742 ? "interrupt " : "",
1743 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1744 ? "status " : "",
1745 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1746 ? "NAKmode " : "",
1747 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1748 ? "DATA1 " : "DATA0 ",
1749 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1750 ? "HALT " : "",
1751 readl(&ep->regs->ep_irqenb));
1752 size -= t;
1753 next += t;
1754
1755 t = scnprintf(next, size,
1756 "\tstat %08x avail %04x "
1757 "(ep%d%s-%s)%s\n",
1758 readl(&ep->regs->ep_stat),
1759 readl(&ep->regs->ep_avail),
1760 t1 & 0x0f, DIR_STRING(t1),
1761 type_string(t1 >> 8),
1762 ep->stopped ? "*" : "");
1763 size -= t;
1764 next += t;
1765
1766 if (!ep->dma)
1767 continue;
1768
1769 t = scnprintf(next, size,
1770 " dma\tctl %08x stat %08x count %08x\n"
1771 "\taddr %08x desc %08x\n",
1772 readl(&ep->dma->dmactl),
1773 readl(&ep->dma->dmastat),
1774 readl(&ep->dma->dmacount),
1775 readl(&ep->dma->dmaaddr),
1776 readl(&ep->dma->dmadesc));
1777 size -= t;
1778 next += t;
1779
1780 }
1781
1782 /* Indexed Registers (none yet) */
1783
1784 /* Statistics */
1785 t = scnprintf(next, size, "\nirqs: ");
1786 size -= t;
1787 next += t;
1788 for (i = 0; i < dev->n_ep; i++) {
1789 struct net2280_ep *ep;
1790
1791 ep = &dev->ep[i];
1792 if (i && !ep->irqs)
1793 continue;
1794 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1795 size -= t;
1796 next += t;
1797
1798 }
1799 t = scnprintf(next, size, "\n");
1800 size -= t;
1801 next += t;
1802
1803 spin_unlock_irqrestore(&dev->lock, flags);
1804
1805 return PAGE_SIZE - size;
1806 }
1807 static DEVICE_ATTR_RO(registers);
1808
queues_show(struct device * _dev,struct device_attribute * attr,char * buf)1809 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1810 char *buf)
1811 {
1812 struct net2280 *dev;
1813 char *next;
1814 unsigned size;
1815 unsigned long flags;
1816 int i;
1817
1818 dev = dev_get_drvdata(_dev);
1819 next = buf;
1820 size = PAGE_SIZE;
1821 spin_lock_irqsave(&dev->lock, flags);
1822
1823 for (i = 0; i < dev->n_ep; i++) {
1824 struct net2280_ep *ep = &dev->ep[i];
1825 struct net2280_request *req;
1826 int t;
1827
1828 if (i != 0) {
1829 const struct usb_endpoint_descriptor *d;
1830
1831 d = ep->desc;
1832 if (!d)
1833 continue;
1834 t = d->bEndpointAddress;
1835 t = scnprintf(next, size,
1836 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1837 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1838 (t & USB_DIR_IN) ? "in" : "out",
1839 type_string(d->bmAttributes),
1840 usb_endpoint_maxp(d),
1841 ep->dma ? "dma" : "pio", ep->fifo_size
1842 );
1843 } else /* ep0 should only have one transfer queued */
1844 t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1845 ep->is_in ? "in" : "out");
1846 if (t <= 0 || t > size)
1847 goto done;
1848 size -= t;
1849 next += t;
1850
1851 if (list_empty(&ep->queue)) {
1852 t = scnprintf(next, size, "\t(nothing queued)\n");
1853 if (t <= 0 || t > size)
1854 goto done;
1855 size -= t;
1856 next += t;
1857 continue;
1858 }
1859 list_for_each_entry(req, &ep->queue, queue) {
1860 if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1861 t = scnprintf(next, size,
1862 "\treq %p len %d/%d "
1863 "buf %p (dmacount %08x)\n",
1864 &req->req, req->req.actual,
1865 req->req.length, req->req.buf,
1866 readl(&ep->dma->dmacount));
1867 else
1868 t = scnprintf(next, size,
1869 "\treq %p len %d/%d buf %p\n",
1870 &req->req, req->req.actual,
1871 req->req.length, req->req.buf);
1872 if (t <= 0 || t > size)
1873 goto done;
1874 size -= t;
1875 next += t;
1876
1877 if (ep->dma) {
1878 struct net2280_dma *td;
1879
1880 td = req->td;
1881 t = scnprintf(next, size, "\t td %08x "
1882 " count %08x buf %08x desc %08x\n",
1883 (u32) req->td_dma,
1884 le32_to_cpu(td->dmacount),
1885 le32_to_cpu(td->dmaaddr),
1886 le32_to_cpu(td->dmadesc));
1887 if (t <= 0 || t > size)
1888 goto done;
1889 size -= t;
1890 next += t;
1891 }
1892 }
1893 }
1894
1895 done:
1896 spin_unlock_irqrestore(&dev->lock, flags);
1897 return PAGE_SIZE - size;
1898 }
1899 static DEVICE_ATTR_RO(queues);
1900
1901
1902 #else
1903
1904 #define device_create_file(a, b) (0)
1905 #define device_remove_file(a, b) do { } while (0)
1906
1907 #endif
1908
1909 /*-------------------------------------------------------------------------*/
1910
1911 /* another driver-specific mode might be a request type doing dma
1912 * to/from another device fifo instead of to/from memory.
1913 */
1914
set_fifo_mode(struct net2280 * dev,int mode)1915 static void set_fifo_mode(struct net2280 *dev, int mode)
1916 {
1917 /* keeping high bits preserves BAR2 */
1918 writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1919
1920 /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1921 INIT_LIST_HEAD(&dev->gadget.ep_list);
1922 list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1923 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1924 switch (mode) {
1925 case 0:
1926 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1927 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1928 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1929 break;
1930 case 1:
1931 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1932 break;
1933 case 2:
1934 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1935 dev->ep[1].fifo_size = 2048;
1936 dev->ep[2].fifo_size = 1024;
1937 break;
1938 }
1939 /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1940 list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1941 list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1942 }
1943
defect7374_disable_data_eps(struct net2280 * dev)1944 static void defect7374_disable_data_eps(struct net2280 *dev)
1945 {
1946 /*
1947 * For Defect 7374, disable data EPs (and more):
1948 * - This phase undoes the earlier phase of the Defect 7374 workaround,
1949 * returing ep regs back to normal.
1950 */
1951 struct net2280_ep *ep;
1952 int i;
1953 unsigned char ep_sel;
1954 u32 tmp_reg;
1955
1956 for (i = 1; i < 5; i++) {
1957 ep = &dev->ep[i];
1958 writel(i, &ep->cfg->ep_cfg);
1959 }
1960
1961 /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1962 for (i = 0; i < 6; i++)
1963 writel(0, &dev->dep[i].dep_cfg);
1964
1965 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1966 /* Select an endpoint for subsequent operations: */
1967 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1968 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1969
1970 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1971 ep_sel == 18 || ep_sel == 20)
1972 continue;
1973
1974 /* Change settings on some selected endpoints */
1975 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1976 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1977 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1978 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1979 tmp_reg |= BIT(EP_INITIALIZED);
1980 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1981 }
1982 }
1983
defect7374_enable_data_eps_zero(struct net2280 * dev)1984 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1985 {
1986 u32 tmp = 0, tmp_reg;
1987 u32 scratch;
1988 int i;
1989 unsigned char ep_sel;
1990
1991 scratch = get_idx_reg(dev->regs, SCRATCH);
1992
1993 WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1994 == DEFECT7374_FSM_SS_CONTROL_READ);
1995
1996 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1997
1998 ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1999 ep_warn(dev, "It will operate on cold-reboot and SS connect");
2000
2001 /*GPEPs:*/
2002 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
2003 (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
2004 ((dev->enhanced_mode) ?
2005 BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
2006 BIT(ENDPOINT_ENABLE)));
2007
2008 for (i = 1; i < 5; i++)
2009 writel(tmp, &dev->ep[i].cfg->ep_cfg);
2010
2011 /* CSRIN, PCIIN, STATIN, RCIN*/
2012 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2013 writel(tmp, &dev->dep[1].dep_cfg);
2014 writel(tmp, &dev->dep[3].dep_cfg);
2015 writel(tmp, &dev->dep[4].dep_cfg);
2016 writel(tmp, &dev->dep[5].dep_cfg);
2017
2018 /*Implemented for development and debug.
2019 * Can be refined/tuned later.*/
2020 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2021 /* Select an endpoint for subsequent operations: */
2022 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2023 writel(((tmp_reg & ~0x1f) | ep_sel),
2024 &dev->plregs->pl_ep_ctrl);
2025
2026 if (ep_sel == 1) {
2027 tmp =
2028 (readl(&dev->plregs->pl_ep_ctrl) |
2029 BIT(CLEAR_ACK_ERROR_CODE) | 0);
2030 writel(tmp, &dev->plregs->pl_ep_ctrl);
2031 continue;
2032 }
2033
2034 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2035 ep_sel == 18 || ep_sel == 20)
2036 continue;
2037
2038 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2039 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2040 writel(tmp, &dev->plregs->pl_ep_cfg_4);
2041
2042 tmp = readl(&dev->plregs->pl_ep_ctrl) &
2043 ~BIT(EP_INITIALIZED);
2044 writel(tmp, &dev->plregs->pl_ep_ctrl);
2045
2046 }
2047
2048 /* Set FSM to focus on the first Control Read:
2049 * - Tip: Connection speed is known upon the first
2050 * setup request.*/
2051 scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2052 set_idx_reg(dev->regs, SCRATCH, scratch);
2053
2054 }
2055
2056 /* keeping it simple:
2057 * - one bus driver, initted first;
2058 * - one function driver, initted second
2059 *
2060 * most of the work to support multiple net2280 controllers would
2061 * be to associate this gadget driver (yes?) with all of them, or
2062 * perhaps to bind specific drivers to specific devices.
2063 */
2064
usb_reset_228x(struct net2280 * dev)2065 static void usb_reset_228x(struct net2280 *dev)
2066 {
2067 u32 tmp;
2068
2069 dev->gadget.speed = USB_SPEED_UNKNOWN;
2070 (void) readl(&dev->usb->usbctl);
2071
2072 net2280_led_init(dev);
2073
2074 /* disable automatic responses, and irqs */
2075 writel(0, &dev->usb->stdrsp);
2076 writel(0, &dev->regs->pciirqenb0);
2077 writel(0, &dev->regs->pciirqenb1);
2078
2079 /* clear old dma and irq state */
2080 for (tmp = 0; tmp < 4; tmp++) {
2081 struct net2280_ep *ep = &dev->ep[tmp + 1];
2082 if (ep->dma)
2083 abort_dma(ep);
2084 }
2085
2086 writel(~0, &dev->regs->irqstat0),
2087 writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2088
2089 /* reset, and enable pci */
2090 tmp = readl(&dev->regs->devinit) |
2091 BIT(PCI_ENABLE) |
2092 BIT(FIFO_SOFT_RESET) |
2093 BIT(USB_SOFT_RESET) |
2094 BIT(M8051_RESET);
2095 writel(tmp, &dev->regs->devinit);
2096
2097 /* standard fifo and endpoint allocations */
2098 set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2099 }
2100
usb_reset_338x(struct net2280 * dev)2101 static void usb_reset_338x(struct net2280 *dev)
2102 {
2103 u32 tmp;
2104
2105 dev->gadget.speed = USB_SPEED_UNKNOWN;
2106 (void)readl(&dev->usb->usbctl);
2107
2108 net2280_led_init(dev);
2109
2110 if (dev->bug7734_patched) {
2111 /* disable automatic responses, and irqs */
2112 writel(0, &dev->usb->stdrsp);
2113 writel(0, &dev->regs->pciirqenb0);
2114 writel(0, &dev->regs->pciirqenb1);
2115 }
2116
2117 /* clear old dma and irq state */
2118 for (tmp = 0; tmp < 4; tmp++) {
2119 struct net2280_ep *ep = &dev->ep[tmp + 1];
2120 struct net2280_dma_regs __iomem *dma;
2121
2122 if (ep->dma) {
2123 abort_dma(ep);
2124 } else {
2125 dma = &dev->dma[tmp];
2126 writel(BIT(DMA_ABORT), &dma->dmastat);
2127 writel(0, &dma->dmactl);
2128 }
2129 }
2130
2131 writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2132
2133 if (dev->bug7734_patched) {
2134 /* reset, and enable pci */
2135 tmp = readl(&dev->regs->devinit) |
2136 BIT(PCI_ENABLE) |
2137 BIT(FIFO_SOFT_RESET) |
2138 BIT(USB_SOFT_RESET) |
2139 BIT(M8051_RESET);
2140
2141 writel(tmp, &dev->regs->devinit);
2142 }
2143
2144 /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2145 INIT_LIST_HEAD(&dev->gadget.ep_list);
2146
2147 for (tmp = 1; tmp < dev->n_ep; tmp++)
2148 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2149
2150 }
2151
usb_reset(struct net2280 * dev)2152 static void usb_reset(struct net2280 *dev)
2153 {
2154 if (dev->quirks & PLX_LEGACY)
2155 return usb_reset_228x(dev);
2156 return usb_reset_338x(dev);
2157 }
2158
usb_reinit_228x(struct net2280 * dev)2159 static void usb_reinit_228x(struct net2280 *dev)
2160 {
2161 u32 tmp;
2162
2163 /* basic endpoint init */
2164 for (tmp = 0; tmp < 7; tmp++) {
2165 struct net2280_ep *ep = &dev->ep[tmp];
2166
2167 ep->ep.name = ep_info_dft[tmp].name;
2168 ep->ep.caps = ep_info_dft[tmp].caps;
2169 ep->dev = dev;
2170 ep->num = tmp;
2171
2172 if (tmp > 0 && tmp <= 4) {
2173 ep->fifo_size = 1024;
2174 ep->dma = &dev->dma[tmp - 1];
2175 } else
2176 ep->fifo_size = 64;
2177 ep->regs = &dev->epregs[tmp];
2178 ep->cfg = &dev->epregs[tmp];
2179 ep_reset_228x(dev->regs, ep);
2180 }
2181 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2182 usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2183 usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2184
2185 dev->gadget.ep0 = &dev->ep[0].ep;
2186 dev->ep[0].stopped = 0;
2187 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2188
2189 /* we want to prevent lowlevel/insecure access from the USB host,
2190 * but erratum 0119 means this enable bit is ignored
2191 */
2192 for (tmp = 0; tmp < 5; tmp++)
2193 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2194 }
2195
usb_reinit_338x(struct net2280 * dev)2196 static void usb_reinit_338x(struct net2280 *dev)
2197 {
2198 int i;
2199 u32 tmp, val;
2200 static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2201 static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2202 0x00, 0xC0, 0x00, 0xC0 };
2203
2204 /* basic endpoint init */
2205 for (i = 0; i < dev->n_ep; i++) {
2206 struct net2280_ep *ep = &dev->ep[i];
2207
2208 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2209 ep_info_dft[i].name;
2210 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2211 ep_info_dft[i].caps;
2212 ep->dev = dev;
2213 ep->num = i;
2214
2215 if (i > 0 && i <= 4)
2216 ep->dma = &dev->dma[i - 1];
2217
2218 if (dev->enhanced_mode) {
2219 ep->cfg = &dev->epregs[ne[i]];
2220 /*
2221 * Set USB endpoint number, hardware allows same number
2222 * in both directions.
2223 */
2224 if (i > 0 && i < 5)
2225 writel(ne[i], &ep->cfg->ep_cfg);
2226 ep->regs = (struct net2280_ep_regs __iomem *)
2227 (((void __iomem *)&dev->epregs[ne[i]]) +
2228 ep_reg_addr[i]);
2229 } else {
2230 ep->cfg = &dev->epregs[i];
2231 ep->regs = &dev->epregs[i];
2232 }
2233
2234 ep->fifo_size = (i != 0) ? 2048 : 512;
2235
2236 ep_reset_338x(dev->regs, ep);
2237 }
2238 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2239
2240 dev->gadget.ep0 = &dev->ep[0].ep;
2241 dev->ep[0].stopped = 0;
2242
2243 /* Link layer set up */
2244 if (dev->bug7734_patched) {
2245 tmp = readl(&dev->usb_ext->usbctl2) &
2246 ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2247 writel(tmp, &dev->usb_ext->usbctl2);
2248 }
2249
2250 /* Hardware Defect and Workaround */
2251 val = readl(&dev->ll_lfps_regs->ll_lfps_5);
2252 val &= ~(0xf << TIMER_LFPS_6US);
2253 val |= 0x5 << TIMER_LFPS_6US;
2254 writel(val, &dev->ll_lfps_regs->ll_lfps_5);
2255
2256 val = readl(&dev->ll_lfps_regs->ll_lfps_6);
2257 val &= ~(0xffff << TIMER_LFPS_80US);
2258 val |= 0x0100 << TIMER_LFPS_80US;
2259 writel(val, &dev->ll_lfps_regs->ll_lfps_6);
2260
2261 /*
2262 * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2263 * Hot Reset Exit Handshake may Fail in Specific Case using
2264 * Default Register Settings. Workaround for Enumeration test.
2265 */
2266 val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
2267 val &= ~(0x1f << HOT_TX_NORESET_TS2);
2268 val |= 0x10 << HOT_TX_NORESET_TS2;
2269 writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
2270
2271 val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
2272 val &= ~(0x1f << HOT_RX_RESET_TS2);
2273 val |= 0x3 << HOT_RX_RESET_TS2;
2274 writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
2275
2276 /*
2277 * Set Recovery Idle to Recover bit:
2278 * - On SS connections, setting Recovery Idle to Recover Fmw improves
2279 * link robustness with various hosts and hubs.
2280 * - It is safe to set for all connection speeds; all chip revisions.
2281 * - R-M-W to leave other bits undisturbed.
2282 * - Reference PLX TT-7372
2283 */
2284 val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
2285 val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2286 writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
2287
2288 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2289
2290 /* disable dedicated endpoints */
2291 writel(0x0D, &dev->dep[0].dep_cfg);
2292 writel(0x0D, &dev->dep[1].dep_cfg);
2293 writel(0x0E, &dev->dep[2].dep_cfg);
2294 writel(0x0E, &dev->dep[3].dep_cfg);
2295 writel(0x0F, &dev->dep[4].dep_cfg);
2296 writel(0x0C, &dev->dep[5].dep_cfg);
2297 }
2298
usb_reinit(struct net2280 * dev)2299 static void usb_reinit(struct net2280 *dev)
2300 {
2301 if (dev->quirks & PLX_LEGACY)
2302 return usb_reinit_228x(dev);
2303 return usb_reinit_338x(dev);
2304 }
2305
ep0_start_228x(struct net2280 * dev)2306 static void ep0_start_228x(struct net2280 *dev)
2307 {
2308 writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2309 BIT(CLEAR_NAK_OUT_PACKETS) |
2310 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2311 &dev->epregs[0].ep_rsp);
2312
2313 /*
2314 * hardware optionally handles a bunch of standard requests
2315 * that the API hides from drivers anyway. have it do so.
2316 * endpoint status/features are handled in software, to
2317 * help pass tests for some dubious behavior.
2318 */
2319 writel(BIT(SET_TEST_MODE) |
2320 BIT(SET_ADDRESS) |
2321 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2322 BIT(GET_DEVICE_STATUS) |
2323 BIT(GET_INTERFACE_STATUS),
2324 &dev->usb->stdrsp);
2325 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2326 BIT(SELF_POWERED_USB_DEVICE) |
2327 BIT(REMOTE_WAKEUP_SUPPORT) |
2328 (dev->softconnect << USB_DETECT_ENABLE) |
2329 BIT(SELF_POWERED_STATUS),
2330 &dev->usb->usbctl);
2331
2332 /* enable irqs so we can see ep0 and general operation */
2333 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2334 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2335 &dev->regs->pciirqenb0);
2336 writel(BIT(PCI_INTERRUPT_ENABLE) |
2337 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2338 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2339 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2340 BIT(VBUS_INTERRUPT_ENABLE) |
2341 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2342 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2343 &dev->regs->pciirqenb1);
2344
2345 /* don't leave any writes posted */
2346 (void) readl(&dev->usb->usbctl);
2347 }
2348
ep0_start_338x(struct net2280 * dev)2349 static void ep0_start_338x(struct net2280 *dev)
2350 {
2351
2352 if (dev->bug7734_patched)
2353 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2354 BIT(SET_EP_HIDE_STATUS_PHASE),
2355 &dev->epregs[0].ep_rsp);
2356
2357 /*
2358 * hardware optionally handles a bunch of standard requests
2359 * that the API hides from drivers anyway. have it do so.
2360 * endpoint status/features are handled in software, to
2361 * help pass tests for some dubious behavior.
2362 */
2363 writel(BIT(SET_ISOCHRONOUS_DELAY) |
2364 BIT(SET_SEL) |
2365 BIT(SET_TEST_MODE) |
2366 BIT(SET_ADDRESS) |
2367 BIT(GET_INTERFACE_STATUS) |
2368 BIT(GET_DEVICE_STATUS),
2369 &dev->usb->stdrsp);
2370 dev->wakeup_enable = 1;
2371 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2372 (dev->softconnect << USB_DETECT_ENABLE) |
2373 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2374 &dev->usb->usbctl);
2375
2376 /* enable irqs so we can see ep0 and general operation */
2377 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2378 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2379 &dev->regs->pciirqenb0);
2380 writel(BIT(PCI_INTERRUPT_ENABLE) |
2381 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2382 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2383 BIT(VBUS_INTERRUPT_ENABLE),
2384 &dev->regs->pciirqenb1);
2385
2386 /* don't leave any writes posted */
2387 (void)readl(&dev->usb->usbctl);
2388 }
2389
ep0_start(struct net2280 * dev)2390 static void ep0_start(struct net2280 *dev)
2391 {
2392 if (dev->quirks & PLX_LEGACY)
2393 return ep0_start_228x(dev);
2394 return ep0_start_338x(dev);
2395 }
2396
2397 /* when a driver is successfully registered, it will receive
2398 * control requests including set_configuration(), which enables
2399 * non-control requests. then usb traffic follows until a
2400 * disconnect is reported. then a host may connect again, or
2401 * the driver might get unbound.
2402 */
net2280_start(struct usb_gadget * _gadget,struct usb_gadget_driver * driver)2403 static int net2280_start(struct usb_gadget *_gadget,
2404 struct usb_gadget_driver *driver)
2405 {
2406 struct net2280 *dev;
2407 int retval;
2408 unsigned i;
2409
2410 /* insist on high speed support from the driver, since
2411 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2412 * "must not be used in normal operation"
2413 */
2414 if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2415 !driver->setup)
2416 return -EINVAL;
2417
2418 dev = container_of(_gadget, struct net2280, gadget);
2419
2420 for (i = 0; i < dev->n_ep; i++)
2421 dev->ep[i].irqs = 0;
2422
2423 /* hook up the driver ... */
2424 driver->driver.bus = NULL;
2425 dev->driver = driver;
2426
2427 retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2428 if (retval)
2429 goto err_unbind;
2430 retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2431 if (retval)
2432 goto err_func;
2433
2434 /* enable host detection and ep0; and we're ready
2435 * for set_configuration as well as eventual disconnect.
2436 */
2437 net2280_led_active(dev, 1);
2438
2439 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2440 defect7374_enable_data_eps_zero(dev);
2441
2442 ep0_start(dev);
2443
2444 /* pci writes may still be posted */
2445 return 0;
2446
2447 err_func:
2448 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2449 err_unbind:
2450 dev->driver = NULL;
2451 return retval;
2452 }
2453
stop_activity(struct net2280 * dev,struct usb_gadget_driver * driver)2454 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2455 {
2456 int i;
2457
2458 /* don't disconnect if it's not connected */
2459 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2460 driver = NULL;
2461
2462 /* stop hardware; prevent new request submissions;
2463 * and kill any outstanding requests.
2464 */
2465 usb_reset(dev);
2466 for (i = 0; i < dev->n_ep; i++)
2467 nuke(&dev->ep[i]);
2468
2469 /* report disconnect; the driver is already quiesced */
2470 if (driver) {
2471 spin_unlock(&dev->lock);
2472 driver->disconnect(&dev->gadget);
2473 spin_lock(&dev->lock);
2474 }
2475
2476 usb_reinit(dev);
2477 }
2478
net2280_stop(struct usb_gadget * _gadget)2479 static int net2280_stop(struct usb_gadget *_gadget)
2480 {
2481 struct net2280 *dev;
2482 unsigned long flags;
2483
2484 dev = container_of(_gadget, struct net2280, gadget);
2485
2486 spin_lock_irqsave(&dev->lock, flags);
2487 stop_activity(dev, NULL);
2488 spin_unlock_irqrestore(&dev->lock, flags);
2489
2490 net2280_led_active(dev, 0);
2491
2492 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2493 device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2494
2495 dev->driver = NULL;
2496
2497 return 0;
2498 }
2499
2500 /*-------------------------------------------------------------------------*/
2501
2502 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2503 * also works for dma-capable endpoints, in pio mode or just
2504 * to manually advance the queue after short OUT transfers.
2505 */
handle_ep_small(struct net2280_ep * ep)2506 static void handle_ep_small(struct net2280_ep *ep)
2507 {
2508 struct net2280_request *req;
2509 u32 t;
2510 /* 0 error, 1 mid-data, 2 done */
2511 int mode = 1;
2512
2513 if (!list_empty(&ep->queue))
2514 req = list_entry(ep->queue.next,
2515 struct net2280_request, queue);
2516 else
2517 req = NULL;
2518
2519 /* ack all, and handle what we care about */
2520 t = readl(&ep->regs->ep_stat);
2521 ep->irqs++;
2522
2523 ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2524 ep->ep.name, t, req ? &req->req : NULL);
2525
2526 if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2527 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2528 else
2529 /* Added for 2282 */
2530 writel(t, &ep->regs->ep_stat);
2531
2532 /* for ep0, monitor token irqs to catch data stage length errors
2533 * and to synchronize on status.
2534 *
2535 * also, to defer reporting of protocol stalls ... here's where
2536 * data or status first appears, handling stalls here should never
2537 * cause trouble on the host side..
2538 *
2539 * control requests could be slightly faster without token synch for
2540 * status, but status can jam up that way.
2541 */
2542 if (unlikely(ep->num == 0)) {
2543 if (ep->is_in) {
2544 /* status; stop NAKing */
2545 if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2546 if (ep->dev->protocol_stall) {
2547 ep->stopped = 1;
2548 set_halt(ep);
2549 }
2550 if (!req)
2551 allow_status(ep);
2552 mode = 2;
2553 /* reply to extra IN data tokens with a zlp */
2554 } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2555 if (ep->dev->protocol_stall) {
2556 ep->stopped = 1;
2557 set_halt(ep);
2558 mode = 2;
2559 } else if (ep->responded &&
2560 !req && !ep->stopped)
2561 write_fifo(ep, NULL);
2562 }
2563 } else {
2564 /* status; stop NAKing */
2565 if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2566 if (ep->dev->protocol_stall) {
2567 ep->stopped = 1;
2568 set_halt(ep);
2569 }
2570 mode = 2;
2571 /* an extra OUT token is an error */
2572 } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2573 req &&
2574 req->req.actual == req->req.length) ||
2575 (ep->responded && !req)) {
2576 ep->dev->protocol_stall = 1;
2577 set_halt(ep);
2578 ep->stopped = 1;
2579 if (req)
2580 done(ep, req, -EOVERFLOW);
2581 req = NULL;
2582 }
2583 }
2584 }
2585
2586 if (unlikely(!req))
2587 return;
2588
2589 /* manual DMA queue advance after short OUT */
2590 if (likely(ep->dma)) {
2591 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2592 struct net2280_request *stuck_req = NULL;
2593 int stopped = ep->stopped;
2594 int num_completed;
2595 int stuck = 0;
2596 u32 count;
2597
2598 /* TRANSFERRED works around OUT_DONE erratum 0112.
2599 * we expect (N <= maxpacket) bytes; host wrote M.
2600 * iff (M < N) we won't ever see a DMA interrupt.
2601 */
2602 ep->stopped = 1;
2603 for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2604
2605 /* any preceding dma transfers must finish.
2606 * dma handles (M >= N), may empty the queue
2607 */
2608 num_completed = scan_dma_completions(ep);
2609 if (unlikely(list_empty(&ep->queue) ||
2610 ep->out_overflow)) {
2611 req = NULL;
2612 break;
2613 }
2614 req = list_entry(ep->queue.next,
2615 struct net2280_request, queue);
2616
2617 /* here either (M < N), a "real" short rx;
2618 * or (M == N) and the queue didn't empty
2619 */
2620 if (likely(t & BIT(FIFO_EMPTY))) {
2621 count = readl(&ep->dma->dmacount);
2622 count &= DMA_BYTE_COUNT_MASK;
2623 if (readl(&ep->dma->dmadesc)
2624 != req->td_dma)
2625 req = NULL;
2626 break;
2627 }
2628
2629 /* Escape loop if no dma transfers completed
2630 * after few retries.
2631 */
2632 if (num_completed == 0) {
2633 if (stuck_req == req &&
2634 readl(&ep->dma->dmadesc) !=
2635 req->td_dma && stuck++ > 5) {
2636 count = readl(
2637 &ep->dma->dmacount);
2638 count &= DMA_BYTE_COUNT_MASK;
2639 req = NULL;
2640 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2641 ep->ep.name, stuck,
2642 count);
2643 break;
2644 } else if (stuck_req != req) {
2645 stuck_req = req;
2646 stuck = 0;
2647 }
2648 } else {
2649 stuck_req = NULL;
2650 stuck = 0;
2651 }
2652
2653 udelay(1);
2654 }
2655
2656 /* stop DMA, leave ep NAKing */
2657 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2658 spin_stop_dma(ep->dma);
2659
2660 if (likely(req)) {
2661 req->td->dmacount = 0;
2662 t = readl(&ep->regs->ep_avail);
2663 dma_done(ep, req, count,
2664 (ep->out_overflow || t)
2665 ? -EOVERFLOW : 0);
2666 }
2667
2668 /* also flush to prevent erratum 0106 trouble */
2669 if (unlikely(ep->out_overflow ||
2670 (ep->dev->chiprev == 0x0100 &&
2671 ep->dev->gadget.speed
2672 == USB_SPEED_FULL))) {
2673 out_flush(ep);
2674 ep->out_overflow = 0;
2675 }
2676
2677 /* (re)start dma if needed, stop NAKing */
2678 ep->stopped = stopped;
2679 if (!list_empty(&ep->queue))
2680 restart_dma(ep);
2681 } else
2682 ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2683 ep->ep.name, t);
2684 return;
2685
2686 /* data packet(s) received (in the fifo, OUT) */
2687 } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2688 if (read_fifo(ep, req) && ep->num != 0)
2689 mode = 2;
2690
2691 /* data packet(s) transmitted (IN) */
2692 } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2693 unsigned len;
2694
2695 len = req->req.length - req->req.actual;
2696 if (len > ep->ep.maxpacket)
2697 len = ep->ep.maxpacket;
2698 req->req.actual += len;
2699
2700 /* if we wrote it all, we're usually done */
2701 /* send zlps until the status stage */
2702 if ((req->req.actual == req->req.length) &&
2703 (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2704 mode = 2;
2705
2706 /* there was nothing to do ... */
2707 } else if (mode == 1)
2708 return;
2709
2710 /* done */
2711 if (mode == 2) {
2712 /* stream endpoints often resubmit/unlink in completion */
2713 done(ep, req, 0);
2714
2715 /* maybe advance queue to next request */
2716 if (ep->num == 0) {
2717 /* NOTE: net2280 could let gadget driver start the
2718 * status stage later. since not all controllers let
2719 * them control that, the api doesn't (yet) allow it.
2720 */
2721 if (!ep->stopped)
2722 allow_status(ep);
2723 req = NULL;
2724 } else {
2725 if (!list_empty(&ep->queue) && !ep->stopped)
2726 req = list_entry(ep->queue.next,
2727 struct net2280_request, queue);
2728 else
2729 req = NULL;
2730 if (req && !ep->is_in)
2731 stop_out_naking(ep);
2732 }
2733 }
2734
2735 /* is there a buffer for the next packet?
2736 * for best streaming performance, make sure there is one.
2737 */
2738 if (req && !ep->stopped) {
2739
2740 /* load IN fifo with next packet (may be zlp) */
2741 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2742 write_fifo(ep, &req->req);
2743 }
2744 }
2745
get_ep_by_addr(struct net2280 * dev,u16 wIndex)2746 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2747 {
2748 struct net2280_ep *ep;
2749
2750 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2751 return &dev->ep[0];
2752 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2753 u8 bEndpointAddress;
2754
2755 if (!ep->desc)
2756 continue;
2757 bEndpointAddress = ep->desc->bEndpointAddress;
2758 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2759 continue;
2760 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2761 return ep;
2762 }
2763 return NULL;
2764 }
2765
defect7374_workaround(struct net2280 * dev,struct usb_ctrlrequest r)2766 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2767 {
2768 u32 scratch, fsmvalue;
2769 u32 ack_wait_timeout, state;
2770
2771 /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2772 scratch = get_idx_reg(dev->regs, SCRATCH);
2773 fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2774 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2775
2776 if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2777 (r.bRequestType & USB_DIR_IN)))
2778 return;
2779
2780 /* This is the first Control Read for this connection: */
2781 if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2782 /*
2783 * Connection is NOT SS:
2784 * - Connection must be FS or HS.
2785 * - This FSM state should allow workaround software to
2786 * run after the next USB connection.
2787 */
2788 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2789 dev->bug7734_patched = 1;
2790 goto restore_data_eps;
2791 }
2792
2793 /* Connection is SS: */
2794 for (ack_wait_timeout = 0;
2795 ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2796 ack_wait_timeout++) {
2797
2798 state = readl(&dev->plregs->pl_ep_status_1)
2799 & (0xff << STATE);
2800 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2801 (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2802 scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2803 dev->bug7734_patched = 1;
2804 break;
2805 }
2806
2807 /*
2808 * We have not yet received host's Data Phase ACK
2809 * - Wait and try again.
2810 */
2811 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2812
2813 continue;
2814 }
2815
2816
2817 if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2818 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2819 "to detect SS host's data phase ACK.");
2820 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2821 "got 0x%2.2x.\n", state >> STATE);
2822 } else {
2823 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2824 "%duSec for Control Read Data Phase ACK\n",
2825 DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2826 }
2827
2828 restore_data_eps:
2829 /*
2830 * Restore data EPs to their pre-workaround settings (disabled,
2831 * initialized, and other details).
2832 */
2833 defect7374_disable_data_eps(dev);
2834
2835 set_idx_reg(dev->regs, SCRATCH, scratch);
2836
2837 return;
2838 }
2839
ep_clear_seqnum(struct net2280_ep * ep)2840 static void ep_clear_seqnum(struct net2280_ep *ep)
2841 {
2842 struct net2280 *dev = ep->dev;
2843 u32 val;
2844 static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2845
2846 val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2847 val |= ep_pl[ep->num];
2848 writel(val, &dev->plregs->pl_ep_ctrl);
2849 val |= BIT(SEQUENCE_NUMBER_RESET);
2850 writel(val, &dev->plregs->pl_ep_ctrl);
2851
2852 return;
2853 }
2854
handle_stat0_irqs_superspeed(struct net2280 * dev,struct net2280_ep * ep,struct usb_ctrlrequest r)2855 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2856 struct net2280_ep *ep, struct usb_ctrlrequest r)
2857 {
2858 int tmp = 0;
2859
2860 #define w_value le16_to_cpu(r.wValue)
2861 #define w_index le16_to_cpu(r.wIndex)
2862 #define w_length le16_to_cpu(r.wLength)
2863
2864 switch (r.bRequest) {
2865 struct net2280_ep *e;
2866 u16 status;
2867
2868 case USB_REQ_SET_CONFIGURATION:
2869 dev->addressed_state = !w_value;
2870 goto usb3_delegate;
2871
2872 case USB_REQ_GET_STATUS:
2873 switch (r.bRequestType) {
2874 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2875 status = dev->wakeup_enable ? 0x02 : 0x00;
2876 if (dev->gadget.is_selfpowered)
2877 status |= BIT(0);
2878 status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2879 dev->ltm_enable << 4);
2880 writel(0, &dev->epregs[0].ep_irqenb);
2881 set_fifo_bytecount(ep, sizeof(status));
2882 writel((__force u32) status, &dev->epregs[0].ep_data);
2883 allow_status_338x(ep);
2884 break;
2885
2886 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2887 e = get_ep_by_addr(dev, w_index);
2888 if (!e)
2889 goto do_stall3;
2890 status = readl(&e->regs->ep_rsp) &
2891 BIT(CLEAR_ENDPOINT_HALT);
2892 writel(0, &dev->epregs[0].ep_irqenb);
2893 set_fifo_bytecount(ep, sizeof(status));
2894 writel((__force u32) status, &dev->epregs[0].ep_data);
2895 allow_status_338x(ep);
2896 break;
2897
2898 default:
2899 goto usb3_delegate;
2900 }
2901 break;
2902
2903 case USB_REQ_CLEAR_FEATURE:
2904 switch (r.bRequestType) {
2905 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2906 if (!dev->addressed_state) {
2907 switch (w_value) {
2908 case USB_DEVICE_U1_ENABLE:
2909 dev->u1_enable = 0;
2910 writel(readl(&dev->usb_ext->usbctl2) &
2911 ~BIT(U1_ENABLE),
2912 &dev->usb_ext->usbctl2);
2913 allow_status_338x(ep);
2914 goto next_endpoints3;
2915
2916 case USB_DEVICE_U2_ENABLE:
2917 dev->u2_enable = 0;
2918 writel(readl(&dev->usb_ext->usbctl2) &
2919 ~BIT(U2_ENABLE),
2920 &dev->usb_ext->usbctl2);
2921 allow_status_338x(ep);
2922 goto next_endpoints3;
2923
2924 case USB_DEVICE_LTM_ENABLE:
2925 dev->ltm_enable = 0;
2926 writel(readl(&dev->usb_ext->usbctl2) &
2927 ~BIT(LTM_ENABLE),
2928 &dev->usb_ext->usbctl2);
2929 allow_status_338x(ep);
2930 goto next_endpoints3;
2931
2932 default:
2933 break;
2934 }
2935 }
2936 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2937 dev->wakeup_enable = 0;
2938 writel(readl(&dev->usb->usbctl) &
2939 ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2940 &dev->usb->usbctl);
2941 allow_status_338x(ep);
2942 break;
2943 }
2944 goto usb3_delegate;
2945
2946 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2947 e = get_ep_by_addr(dev, w_index);
2948 if (!e)
2949 goto do_stall3;
2950 if (w_value != USB_ENDPOINT_HALT)
2951 goto do_stall3;
2952 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2953 /*
2954 * Workaround for SS SeqNum not cleared via
2955 * Endpoint Halt (Clear) bit. select endpoint
2956 */
2957 ep_clear_seqnum(e);
2958 clear_halt(e);
2959 if (!list_empty(&e->queue) && e->td_dma)
2960 restart_dma(e);
2961 allow_status(ep);
2962 ep->stopped = 1;
2963 break;
2964
2965 default:
2966 goto usb3_delegate;
2967 }
2968 break;
2969 case USB_REQ_SET_FEATURE:
2970 switch (r.bRequestType) {
2971 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2972 if (!dev->addressed_state) {
2973 switch (w_value) {
2974 case USB_DEVICE_U1_ENABLE:
2975 dev->u1_enable = 1;
2976 writel(readl(&dev->usb_ext->usbctl2) |
2977 BIT(U1_ENABLE),
2978 &dev->usb_ext->usbctl2);
2979 allow_status_338x(ep);
2980 goto next_endpoints3;
2981
2982 case USB_DEVICE_U2_ENABLE:
2983 dev->u2_enable = 1;
2984 writel(readl(&dev->usb_ext->usbctl2) |
2985 BIT(U2_ENABLE),
2986 &dev->usb_ext->usbctl2);
2987 allow_status_338x(ep);
2988 goto next_endpoints3;
2989
2990 case USB_DEVICE_LTM_ENABLE:
2991 dev->ltm_enable = 1;
2992 writel(readl(&dev->usb_ext->usbctl2) |
2993 BIT(LTM_ENABLE),
2994 &dev->usb_ext->usbctl2);
2995 allow_status_338x(ep);
2996 goto next_endpoints3;
2997 default:
2998 break;
2999 }
3000 }
3001
3002 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
3003 dev->wakeup_enable = 1;
3004 writel(readl(&dev->usb->usbctl) |
3005 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
3006 &dev->usb->usbctl);
3007 allow_status_338x(ep);
3008 break;
3009 }
3010 goto usb3_delegate;
3011
3012 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
3013 e = get_ep_by_addr(dev, w_index);
3014 if (!e || (w_value != USB_ENDPOINT_HALT))
3015 goto do_stall3;
3016 ep->stopped = 1;
3017 if (ep->num == 0)
3018 ep->dev->protocol_stall = 1;
3019 else {
3020 if (ep->dma)
3021 abort_dma(ep);
3022 set_halt(ep);
3023 }
3024 allow_status_338x(ep);
3025 break;
3026
3027 default:
3028 goto usb3_delegate;
3029 }
3030
3031 break;
3032 default:
3033
3034 usb3_delegate:
3035 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
3036 r.bRequestType, r.bRequest,
3037 w_value, w_index, w_length,
3038 readl(&ep->cfg->ep_cfg));
3039
3040 ep->responded = 0;
3041 spin_unlock(&dev->lock);
3042 tmp = dev->driver->setup(&dev->gadget, &r);
3043 spin_lock(&dev->lock);
3044 }
3045 do_stall3:
3046 if (tmp < 0) {
3047 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3048 r.bRequestType, r.bRequest, tmp);
3049 dev->protocol_stall = 1;
3050 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
3051 set_halt(ep);
3052 }
3053
3054 next_endpoints3:
3055
3056 #undef w_value
3057 #undef w_index
3058 #undef w_length
3059
3060 return;
3061 }
3062
usb338x_handle_ep_intr(struct net2280 * dev,u32 stat0)3063 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
3064 {
3065 u32 index;
3066 u32 bit;
3067
3068 for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
3069 bit = BIT(ep_bit[index]);
3070
3071 if (!stat0)
3072 break;
3073
3074 if (!(stat0 & bit))
3075 continue;
3076
3077 stat0 &= ~bit;
3078
3079 handle_ep_small(&dev->ep[index]);
3080 }
3081 }
3082
handle_stat0_irqs(struct net2280 * dev,u32 stat)3083 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3084 {
3085 struct net2280_ep *ep;
3086 u32 num, scratch;
3087
3088 /* most of these don't need individual acks */
3089 stat &= ~BIT(INTA_ASSERTED);
3090 if (!stat)
3091 return;
3092 /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3093
3094 /* starting a control request? */
3095 if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3096 union {
3097 u32 raw[2];
3098 struct usb_ctrlrequest r;
3099 } u;
3100 int tmp;
3101 struct net2280_request *req;
3102
3103 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3104 u32 val = readl(&dev->usb->usbstat);
3105 if (val & BIT(SUPER_SPEED)) {
3106 dev->gadget.speed = USB_SPEED_SUPER;
3107 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3108 EP0_SS_MAX_PACKET_SIZE);
3109 } else if (val & BIT(HIGH_SPEED)) {
3110 dev->gadget.speed = USB_SPEED_HIGH;
3111 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3112 EP0_HS_MAX_PACKET_SIZE);
3113 } else {
3114 dev->gadget.speed = USB_SPEED_FULL;
3115 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3116 EP0_HS_MAX_PACKET_SIZE);
3117 }
3118 net2280_led_speed(dev, dev->gadget.speed);
3119 ep_dbg(dev, "%s\n",
3120 usb_speed_string(dev->gadget.speed));
3121 }
3122
3123 ep = &dev->ep[0];
3124 ep->irqs++;
3125
3126 /* make sure any leftover request state is cleared */
3127 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3128 while (!list_empty(&ep->queue)) {
3129 req = list_entry(ep->queue.next,
3130 struct net2280_request, queue);
3131 done(ep, req, (req->req.actual == req->req.length)
3132 ? 0 : -EPROTO);
3133 }
3134 ep->stopped = 0;
3135 dev->protocol_stall = 0;
3136 if (!(dev->quirks & PLX_PCIE)) {
3137 if (ep->dev->quirks & PLX_2280)
3138 tmp = BIT(FIFO_OVERFLOW) |
3139 BIT(FIFO_UNDERFLOW);
3140 else
3141 tmp = 0;
3142
3143 writel(tmp | BIT(TIMEOUT) |
3144 BIT(USB_STALL_SENT) |
3145 BIT(USB_IN_NAK_SENT) |
3146 BIT(USB_IN_ACK_RCVD) |
3147 BIT(USB_OUT_PING_NAK_SENT) |
3148 BIT(USB_OUT_ACK_SENT) |
3149 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3150 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3151 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3152 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3153 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3154 BIT(DATA_IN_TOKEN_INTERRUPT),
3155 &ep->regs->ep_stat);
3156 }
3157 u.raw[0] = readl(&dev->usb->setup0123);
3158 u.raw[1] = readl(&dev->usb->setup4567);
3159
3160 cpu_to_le32s(&u.raw[0]);
3161 cpu_to_le32s(&u.raw[1]);
3162
3163 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
3164 defect7374_workaround(dev, u.r);
3165
3166 tmp = 0;
3167
3168 #define w_value le16_to_cpu(u.r.wValue)
3169 #define w_index le16_to_cpu(u.r.wIndex)
3170 #define w_length le16_to_cpu(u.r.wLength)
3171
3172 /* ack the irq */
3173 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3174 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3175
3176 /* watch control traffic at the token level, and force
3177 * synchronization before letting the status stage happen.
3178 * FIXME ignore tokens we'll NAK, until driver responds.
3179 * that'll mean a lot less irqs for some drivers.
3180 */
3181 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3182 if (ep->is_in) {
3183 scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3184 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3185 BIT(DATA_IN_TOKEN_INTERRUPT);
3186 stop_out_naking(ep);
3187 } else
3188 scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3189 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3190 BIT(DATA_IN_TOKEN_INTERRUPT);
3191 writel(scratch, &dev->epregs[0].ep_irqenb);
3192
3193 /* we made the hardware handle most lowlevel requests;
3194 * everything else goes uplevel to the gadget code.
3195 */
3196 ep->responded = 1;
3197
3198 if (dev->gadget.speed == USB_SPEED_SUPER) {
3199 handle_stat0_irqs_superspeed(dev, ep, u.r);
3200 goto next_endpoints;
3201 }
3202
3203 switch (u.r.bRequest) {
3204 case USB_REQ_GET_STATUS: {
3205 struct net2280_ep *e;
3206 __le32 status;
3207
3208 /* hw handles device and interface status */
3209 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3210 goto delegate;
3211 e = get_ep_by_addr(dev, w_index);
3212 if (!e || w_length > 2)
3213 goto do_stall;
3214
3215 if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3216 status = cpu_to_le32(1);
3217 else
3218 status = cpu_to_le32(0);
3219
3220 /* don't bother with a request object! */
3221 writel(0, &dev->epregs[0].ep_irqenb);
3222 set_fifo_bytecount(ep, w_length);
3223 writel((__force u32)status, &dev->epregs[0].ep_data);
3224 allow_status(ep);
3225 ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3226 goto next_endpoints;
3227 }
3228 break;
3229 case USB_REQ_CLEAR_FEATURE: {
3230 struct net2280_ep *e;
3231
3232 /* hw handles device features */
3233 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3234 goto delegate;
3235 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3236 goto do_stall;
3237 e = get_ep_by_addr(dev, w_index);
3238 if (!e)
3239 goto do_stall;
3240 if (e->wedged) {
3241 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3242 ep->ep.name);
3243 } else {
3244 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3245 clear_halt(e);
3246 if ((ep->dev->quirks & PLX_PCIE) &&
3247 !list_empty(&e->queue) && e->td_dma)
3248 restart_dma(e);
3249 }
3250 allow_status(ep);
3251 goto next_endpoints;
3252 }
3253 break;
3254 case USB_REQ_SET_FEATURE: {
3255 struct net2280_ep *e;
3256
3257 /* hw handles device features */
3258 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3259 goto delegate;
3260 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3261 goto do_stall;
3262 e = get_ep_by_addr(dev, w_index);
3263 if (!e)
3264 goto do_stall;
3265 if (e->ep.name == ep0name)
3266 goto do_stall;
3267 set_halt(e);
3268 if ((dev->quirks & PLX_PCIE) && e->dma)
3269 abort_dma(e);
3270 allow_status(ep);
3271 ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3272 goto next_endpoints;
3273 }
3274 break;
3275 default:
3276 delegate:
3277 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3278 "ep_cfg %08x\n",
3279 u.r.bRequestType, u.r.bRequest,
3280 w_value, w_index, w_length,
3281 readl(&ep->cfg->ep_cfg));
3282 ep->responded = 0;
3283 spin_unlock(&dev->lock);
3284 tmp = dev->driver->setup(&dev->gadget, &u.r);
3285 spin_lock(&dev->lock);
3286 }
3287
3288 /* stall ep0 on error */
3289 if (tmp < 0) {
3290 do_stall:
3291 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3292 u.r.bRequestType, u.r.bRequest, tmp);
3293 dev->protocol_stall = 1;
3294 }
3295
3296 /* some in/out token irq should follow; maybe stall then.
3297 * driver must queue a request (even zlp) or halt ep0
3298 * before the host times out.
3299 */
3300 }
3301
3302 #undef w_value
3303 #undef w_index
3304 #undef w_length
3305
3306 next_endpoints:
3307 if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
3308 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3309 USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3310 USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3311
3312 if (stat & mask) {
3313 usb338x_handle_ep_intr(dev, stat & mask);
3314 stat &= ~mask;
3315 }
3316 } else {
3317 /* endpoint data irq ? */
3318 scratch = stat & 0x7f;
3319 stat &= ~0x7f;
3320 for (num = 0; scratch; num++) {
3321 u32 t;
3322
3323 /* do this endpoint's FIFO and queue need tending? */
3324 t = BIT(num);
3325 if ((scratch & t) == 0)
3326 continue;
3327 scratch ^= t;
3328
3329 ep = &dev->ep[num];
3330 handle_ep_small(ep);
3331 }
3332 }
3333
3334 if (stat)
3335 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3336 }
3337
3338 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3339 BIT(DMA_C_INTERRUPT) | \
3340 BIT(DMA_B_INTERRUPT) | \
3341 BIT(DMA_A_INTERRUPT))
3342 #define PCI_ERROR_INTERRUPTS ( \
3343 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3344 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3345 BIT(PCI_RETRY_ABORT_INTERRUPT))
3346
handle_stat1_irqs(struct net2280 * dev,u32 stat)3347 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3348 __releases(dev->lock)
3349 __acquires(dev->lock)
3350 {
3351 struct net2280_ep *ep;
3352 u32 tmp, num, mask, scratch;
3353
3354 /* after disconnect there's nothing else to do! */
3355 tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3356 mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3357
3358 /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3359 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3360 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3361 * only indicates a change in the reset state).
3362 */
3363 if (stat & tmp) {
3364 bool reset = false;
3365 bool disconnect = false;
3366
3367 /*
3368 * Ignore disconnects and resets if the speed hasn't been set.
3369 * VBUS can bounce and there's always an initial reset.
3370 */
3371 writel(tmp, &dev->regs->irqstat1);
3372 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3373 if ((stat & BIT(VBUS_INTERRUPT)) &&
3374 (readl(&dev->usb->usbctl) &
3375 BIT(VBUS_PIN)) == 0) {
3376 disconnect = true;
3377 ep_dbg(dev, "disconnect %s\n",
3378 dev->driver->driver.name);
3379 } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3380 (readl(&dev->usb->usbstat) & mask)
3381 == 0) {
3382 reset = true;
3383 ep_dbg(dev, "reset %s\n",
3384 dev->driver->driver.name);
3385 }
3386
3387 if (disconnect || reset) {
3388 stop_activity(dev, dev->driver);
3389 ep0_start(dev);
3390 spin_unlock(&dev->lock);
3391 if (reset)
3392 usb_gadget_udc_reset
3393 (&dev->gadget, dev->driver);
3394 else
3395 (dev->driver->disconnect)
3396 (&dev->gadget);
3397 spin_lock(&dev->lock);
3398 return;
3399 }
3400 }
3401 stat &= ~tmp;
3402
3403 /* vBUS can bounce ... one of many reasons to ignore the
3404 * notion of hotplug events on bus connect/disconnect!
3405 */
3406 if (!stat)
3407 return;
3408 }
3409
3410 /* NOTE: chip stays in PCI D0 state for now, but it could
3411 * enter D1 to save more power
3412 */
3413 tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3414 if (stat & tmp) {
3415 writel(tmp, &dev->regs->irqstat1);
3416 spin_unlock(&dev->lock);
3417 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3418 if (dev->driver->suspend)
3419 dev->driver->suspend(&dev->gadget);
3420 if (!enable_suspend)
3421 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3422 } else {
3423 if (dev->driver->resume)
3424 dev->driver->resume(&dev->gadget);
3425 /* at high speed, note erratum 0133 */
3426 }
3427 spin_lock(&dev->lock);
3428 stat &= ~tmp;
3429 }
3430
3431 /* clear any other status/irqs */
3432 if (stat)
3433 writel(stat, &dev->regs->irqstat1);
3434
3435 /* some status we can just ignore */
3436 if (dev->quirks & PLX_2280)
3437 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3438 BIT(SUSPEND_REQUEST_INTERRUPT) |
3439 BIT(RESUME_INTERRUPT) |
3440 BIT(SOF_INTERRUPT));
3441 else
3442 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3443 BIT(RESUME_INTERRUPT) |
3444 BIT(SOF_DOWN_INTERRUPT) |
3445 BIT(SOF_INTERRUPT));
3446
3447 if (!stat)
3448 return;
3449 /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3450
3451 /* DMA status, for ep-{a,b,c,d} */
3452 scratch = stat & DMA_INTERRUPTS;
3453 stat &= ~DMA_INTERRUPTS;
3454 scratch >>= 9;
3455 for (num = 0; scratch; num++) {
3456 struct net2280_dma_regs __iomem *dma;
3457
3458 tmp = BIT(num);
3459 if ((tmp & scratch) == 0)
3460 continue;
3461 scratch ^= tmp;
3462
3463 ep = &dev->ep[num + 1];
3464 dma = ep->dma;
3465
3466 if (!dma)
3467 continue;
3468
3469 /* clear ep's dma status */
3470 tmp = readl(&dma->dmastat);
3471 writel(tmp, &dma->dmastat);
3472
3473 /* dma sync*/
3474 if (dev->quirks & PLX_PCIE) {
3475 u32 r_dmacount = readl(&dma->dmacount);
3476 if (!ep->is_in && (r_dmacount & 0x00FFFFFF) &&
3477 (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3478 continue;
3479 }
3480
3481 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3482 ep_dbg(ep->dev, "%s no xact done? %08x\n",
3483 ep->ep.name, tmp);
3484 continue;
3485 }
3486 stop_dma(ep->dma);
3487
3488 /* OUT transfers terminate when the data from the
3489 * host is in our memory. Process whatever's done.
3490 * On this path, we know transfer's last packet wasn't
3491 * less than req->length. NAK_OUT_PACKETS may be set,
3492 * or the FIFO may already be holding new packets.
3493 *
3494 * IN transfers can linger in the FIFO for a very
3495 * long time ... we ignore that for now, accounting
3496 * precisely (like PIO does) needs per-packet irqs
3497 */
3498 scan_dma_completions(ep);
3499
3500 /* disable dma on inactive queues; else maybe restart */
3501 if (!list_empty(&ep->queue)) {
3502 tmp = readl(&dma->dmactl);
3503 restart_dma(ep);
3504 }
3505 ep->irqs++;
3506 }
3507
3508 /* NOTE: there are other PCI errors we might usefully notice.
3509 * if they appear very often, here's where to try recovering.
3510 */
3511 if (stat & PCI_ERROR_INTERRUPTS) {
3512 ep_err(dev, "pci dma error; stat %08x\n", stat);
3513 stat &= ~PCI_ERROR_INTERRUPTS;
3514 /* these are fatal errors, but "maybe" they won't
3515 * happen again ...
3516 */
3517 stop_activity(dev, dev->driver);
3518 ep0_start(dev);
3519 stat = 0;
3520 }
3521
3522 if (stat)
3523 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3524 }
3525
net2280_irq(int irq,void * _dev)3526 static irqreturn_t net2280_irq(int irq, void *_dev)
3527 {
3528 struct net2280 *dev = _dev;
3529
3530 /* shared interrupt, not ours */
3531 if ((dev->quirks & PLX_LEGACY) &&
3532 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3533 return IRQ_NONE;
3534
3535 spin_lock(&dev->lock);
3536
3537 /* handle disconnect, dma, and more */
3538 handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3539
3540 /* control requests and PIO */
3541 handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3542
3543 if (dev->quirks & PLX_PCIE) {
3544 /* re-enable interrupt to trigger any possible new interrupt */
3545 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3546 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3547 writel(pciirqenb1, &dev->regs->pciirqenb1);
3548 }
3549
3550 spin_unlock(&dev->lock);
3551
3552 return IRQ_HANDLED;
3553 }
3554
3555 /*-------------------------------------------------------------------------*/
3556
gadget_release(struct device * _dev)3557 static void gadget_release(struct device *_dev)
3558 {
3559 struct net2280 *dev = dev_get_drvdata(_dev);
3560
3561 kfree(dev);
3562 }
3563
3564 /* tear down the binding between this driver and the pci device */
3565
net2280_remove(struct pci_dev * pdev)3566 static void net2280_remove(struct pci_dev *pdev)
3567 {
3568 struct net2280 *dev = pci_get_drvdata(pdev);
3569
3570 usb_del_gadget_udc(&dev->gadget);
3571
3572 BUG_ON(dev->driver);
3573
3574 /* then clean up the resources we allocated during probe() */
3575 if (dev->requests) {
3576 int i;
3577 for (i = 1; i < 5; i++) {
3578 if (!dev->ep[i].dummy)
3579 continue;
3580 dma_pool_free(dev->requests, dev->ep[i].dummy,
3581 dev->ep[i].td_dma);
3582 }
3583 dma_pool_destroy(dev->requests);
3584 }
3585 if (dev->got_irq)
3586 free_irq(pdev->irq, dev);
3587 if (dev->quirks & PLX_PCIE)
3588 pci_disable_msi(pdev);
3589 if (dev->regs) {
3590 net2280_led_shutdown(dev);
3591 iounmap(dev->regs);
3592 }
3593 if (dev->region)
3594 release_mem_region(pci_resource_start(pdev, 0),
3595 pci_resource_len(pdev, 0));
3596 if (dev->enabled)
3597 pci_disable_device(pdev);
3598 device_remove_file(&pdev->dev, &dev_attr_registers);
3599
3600 ep_info(dev, "unbind\n");
3601 }
3602
3603 /* wrap this driver around the specified device, but
3604 * don't respond over USB until a gadget driver binds to us.
3605 */
3606
net2280_probe(struct pci_dev * pdev,const struct pci_device_id * id)3607 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3608 {
3609 struct net2280 *dev;
3610 unsigned long resource, len;
3611 void __iomem *base = NULL;
3612 int retval, i;
3613
3614 /* alloc, and start init */
3615 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3616 if (dev == NULL) {
3617 retval = -ENOMEM;
3618 goto done;
3619 }
3620
3621 pci_set_drvdata(pdev, dev);
3622 spin_lock_init(&dev->lock);
3623 dev->quirks = id->driver_data;
3624 dev->pdev = pdev;
3625 dev->gadget.ops = &net2280_ops;
3626 dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3627 USB_SPEED_SUPER : USB_SPEED_HIGH;
3628
3629 /* the "gadget" abstracts/virtualizes the controller */
3630 dev->gadget.name = driver_name;
3631
3632 /* now all the pci goodies ... */
3633 if (pci_enable_device(pdev) < 0) {
3634 retval = -ENODEV;
3635 goto done;
3636 }
3637 dev->enabled = 1;
3638
3639 /* BAR 0 holds all the registers
3640 * BAR 1 is 8051 memory; unused here (note erratum 0103)
3641 * BAR 2 is fifo memory; unused here
3642 */
3643 resource = pci_resource_start(pdev, 0);
3644 len = pci_resource_len(pdev, 0);
3645 if (!request_mem_region(resource, len, driver_name)) {
3646 ep_dbg(dev, "controller already in use\n");
3647 retval = -EBUSY;
3648 goto done;
3649 }
3650 dev->region = 1;
3651
3652 /* FIXME provide firmware download interface to put
3653 * 8051 code into the chip, e.g. to turn on PCI PM.
3654 */
3655
3656 base = ioremap_nocache(resource, len);
3657 if (base == NULL) {
3658 ep_dbg(dev, "can't map memory\n");
3659 retval = -EFAULT;
3660 goto done;
3661 }
3662 dev->regs = (struct net2280_regs __iomem *) base;
3663 dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3664 dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3665 dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3666 dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3667 dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3668
3669 if (dev->quirks & PLX_PCIE) {
3670 u32 fsmvalue;
3671 u32 usbstat;
3672 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3673 (base + 0x00b4);
3674 dev->llregs = (struct usb338x_ll_regs __iomem *)
3675 (base + 0x0700);
3676 dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
3677 (base + 0x0748);
3678 dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
3679 (base + 0x077c);
3680 dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
3681 (base + 0x079c);
3682 dev->plregs = (struct usb338x_pl_regs __iomem *)
3683 (base + 0x0800);
3684 usbstat = readl(&dev->usb->usbstat);
3685 dev->enhanced_mode = !!(usbstat & BIT(11));
3686 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3687 /* put into initial config, link up all endpoints */
3688 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3689 (0xf << DEFECT7374_FSM_FIELD);
3690 /* See if firmware needs to set up for workaround: */
3691 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3692 dev->bug7734_patched = 1;
3693 writel(0, &dev->usb->usbctl);
3694 } else
3695 dev->bug7734_patched = 0;
3696 } else {
3697 dev->enhanced_mode = 0;
3698 dev->n_ep = 7;
3699 /* put into initial config, link up all endpoints */
3700 writel(0, &dev->usb->usbctl);
3701 }
3702
3703 usb_reset(dev);
3704 usb_reinit(dev);
3705
3706 /* irq setup after old hardware is cleaned up */
3707 if (!pdev->irq) {
3708 ep_err(dev, "No IRQ. Check PCI setup!\n");
3709 retval = -ENODEV;
3710 goto done;
3711 }
3712
3713 if (dev->quirks & PLX_PCIE)
3714 if (pci_enable_msi(pdev))
3715 ep_err(dev, "Failed to enable MSI mode\n");
3716
3717 if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3718 driver_name, dev)) {
3719 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3720 retval = -EBUSY;
3721 goto done;
3722 }
3723 dev->got_irq = 1;
3724
3725 /* DMA setup */
3726 /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */
3727 dev->requests = dma_pool_create("requests", &pdev->dev,
3728 sizeof(struct net2280_dma),
3729 0 /* no alignment requirements */,
3730 0 /* or page-crossing issues */);
3731 if (!dev->requests) {
3732 ep_dbg(dev, "can't get request pool\n");
3733 retval = -ENOMEM;
3734 goto done;
3735 }
3736 for (i = 1; i < 5; i++) {
3737 struct net2280_dma *td;
3738
3739 td = dma_pool_alloc(dev->requests, GFP_KERNEL,
3740 &dev->ep[i].td_dma);
3741 if (!td) {
3742 ep_dbg(dev, "can't get dummy %d\n", i);
3743 retval = -ENOMEM;
3744 goto done;
3745 }
3746 td->dmacount = 0; /* not VALID */
3747 td->dmadesc = td->dmaaddr;
3748 dev->ep[i].dummy = td;
3749 }
3750
3751 /* enable lower-overhead pci memory bursts during DMA */
3752 if (dev->quirks & PLX_LEGACY)
3753 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3754 /*
3755 * 256 write retries may not be enough...
3756 BIT(PCI_RETRY_ABORT_ENABLE) |
3757 */
3758 BIT(DMA_READ_MULTIPLE_ENABLE) |
3759 BIT(DMA_READ_LINE_ENABLE),
3760 &dev->pci->pcimstctl);
3761 /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3762 pci_set_master(pdev);
3763 pci_try_set_mwi(pdev);
3764
3765 /* ... also flushes any posted pci writes */
3766 dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3767
3768 /* done */
3769 ep_info(dev, "%s\n", driver_desc);
3770 ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3771 pdev->irq, base, dev->chiprev);
3772 ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3773 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3774 retval = device_create_file(&pdev->dev, &dev_attr_registers);
3775 if (retval)
3776 goto done;
3777
3778 retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
3779 gadget_release);
3780 if (retval)
3781 goto done;
3782 return 0;
3783
3784 done:
3785 if (dev) {
3786 net2280_remove(pdev);
3787 kfree(dev);
3788 }
3789 return retval;
3790 }
3791
3792 /* make sure the board is quiescent; otherwise it will continue
3793 * generating IRQs across the upcoming reboot.
3794 */
3795
net2280_shutdown(struct pci_dev * pdev)3796 static void net2280_shutdown(struct pci_dev *pdev)
3797 {
3798 struct net2280 *dev = pci_get_drvdata(pdev);
3799
3800 /* disable IRQs */
3801 writel(0, &dev->regs->pciirqenb0);
3802 writel(0, &dev->regs->pciirqenb1);
3803
3804 /* disable the pullup so the host will think we're gone */
3805 writel(0, &dev->usb->usbctl);
3806
3807 }
3808
3809
3810 /*-------------------------------------------------------------------------*/
3811
3812 static const struct pci_device_id pci_ids[] = { {
3813 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3814 .class_mask = ~0,
3815 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3816 .device = 0x2280,
3817 .subvendor = PCI_ANY_ID,
3818 .subdevice = PCI_ANY_ID,
3819 .driver_data = PLX_LEGACY | PLX_2280,
3820 }, {
3821 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3822 .class_mask = ~0,
3823 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3824 .device = 0x2282,
3825 .subvendor = PCI_ANY_ID,
3826 .subdevice = PCI_ANY_ID,
3827 .driver_data = PLX_LEGACY,
3828 },
3829 {
3830 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3831 .class_mask = ~0,
3832 .vendor = PCI_VENDOR_ID_PLX,
3833 .device = 0x2380,
3834 .subvendor = PCI_ANY_ID,
3835 .subdevice = PCI_ANY_ID,
3836 .driver_data = PLX_PCIE,
3837 },
3838 {
3839 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3840 .class_mask = ~0,
3841 .vendor = PCI_VENDOR_ID_PLX,
3842 .device = 0x3380,
3843 .subvendor = PCI_ANY_ID,
3844 .subdevice = PCI_ANY_ID,
3845 .driver_data = PLX_PCIE | PLX_SUPERSPEED,
3846 },
3847 {
3848 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3849 .class_mask = ~0,
3850 .vendor = PCI_VENDOR_ID_PLX,
3851 .device = 0x3382,
3852 .subvendor = PCI_ANY_ID,
3853 .subdevice = PCI_ANY_ID,
3854 .driver_data = PLX_PCIE | PLX_SUPERSPEED,
3855 },
3856 { /* end: all zeroes */ }
3857 };
3858 MODULE_DEVICE_TABLE(pci, pci_ids);
3859
3860 /* pci driver glue; this is a "new style" PCI driver module */
3861 static struct pci_driver net2280_pci_driver = {
3862 .name = (char *) driver_name,
3863 .id_table = pci_ids,
3864
3865 .probe = net2280_probe,
3866 .remove = net2280_remove,
3867 .shutdown = net2280_shutdown,
3868
3869 /* FIXME add power management support */
3870 };
3871
3872 module_pci_driver(net2280_pci_driver);
3873
3874 MODULE_DESCRIPTION(DRIVER_DESC);
3875 MODULE_AUTHOR("David Brownell");
3876 MODULE_LICENSE("GPL");
3877