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