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 #include <linux/iopoll.h>
56
57 #include <asm/byteorder.h>
58 #include <asm/irq.h>
59 #include <asm/unaligned.h>
60
61 #define DRIVER_DESC "PLX NET228x/USB338x USB Peripheral Controller"
62 #define DRIVER_VERSION "2005 Sept 27/v3.0"
63
64 #define EP_DONTUSE 13 /* nonzero */
65
66 #define USE_RDK_LEDS /* GPIO pins control three LEDs */
67
68
69 static const char driver_name[] = "net2280";
70 static const char driver_desc[] = DRIVER_DESC;
71
72 static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
73 static const char ep0name[] = "ep0";
74
75 #define EP_INFO(_name, _caps) \
76 { \
77 .name = _name, \
78 .caps = _caps, \
79 }
80
81 static const struct {
82 const char *name;
83 const struct usb_ep_caps caps;
84 } ep_info_dft[] = { /* Default endpoint configuration */
85 EP_INFO(ep0name,
86 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
87 EP_INFO("ep-a",
88 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
89 EP_INFO("ep-b",
90 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
91 EP_INFO("ep-c",
92 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
93 EP_INFO("ep-d",
94 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
95 EP_INFO("ep-e",
96 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
97 EP_INFO("ep-f",
98 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
99 EP_INFO("ep-g",
100 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
101 EP_INFO("ep-h",
102 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
103 }, ep_info_adv[] = { /* Endpoints for usb3380 advance mode */
104 EP_INFO(ep0name,
105 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
106 EP_INFO("ep1in",
107 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
108 EP_INFO("ep2out",
109 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
110 EP_INFO("ep3in",
111 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
112 EP_INFO("ep4out",
113 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
114 EP_INFO("ep1out",
115 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
116 EP_INFO("ep2in",
117 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
118 EP_INFO("ep3out",
119 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
120 EP_INFO("ep4in",
121 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
122 };
123
124 #undef EP_INFO
125
126 /* mode 0 == ep-{a,b,c,d} 1K fifo each
127 * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
128 * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
129 */
130 static ushort fifo_mode;
131
132 /* "modprobe net2280 fifo_mode=1" etc */
133 module_param(fifo_mode, ushort, 0644);
134
135 /* enable_suspend -- When enabled, the driver will respond to
136 * USB suspend requests by powering down the NET2280. Otherwise,
137 * USB suspend requests will be ignored. This is acceptable for
138 * self-powered devices
139 */
140 static bool enable_suspend;
141
142 /* "modprobe net2280 enable_suspend=1" etc */
143 module_param(enable_suspend, bool, 0444);
144
145 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
146
type_string(u8 bmAttributes)147 static char *type_string(u8 bmAttributes)
148 {
149 switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
150 case USB_ENDPOINT_XFER_BULK: return "bulk";
151 case USB_ENDPOINT_XFER_ISOC: return "iso";
152 case USB_ENDPOINT_XFER_INT: return "intr";
153 }
154 return "control";
155 }
156
157 #include "net2280.h"
158
159 #define valid_bit cpu_to_le32(BIT(VALID_BIT))
160 #define dma_done_ie cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
161
162 static void ep_clear_seqnum(struct net2280_ep *ep);
163 static void stop_activity(struct net2280 *dev,
164 struct usb_gadget_driver *driver);
165 static void ep0_start(struct net2280 *dev);
166
167 /*-------------------------------------------------------------------------*/
enable_pciirqenb(struct net2280_ep * ep)168 static inline void enable_pciirqenb(struct net2280_ep *ep)
169 {
170 u32 tmp = readl(&ep->dev->regs->pciirqenb0);
171
172 if (ep->dev->quirks & PLX_LEGACY)
173 tmp |= BIT(ep->num);
174 else
175 tmp |= BIT(ep_bit[ep->num]);
176 writel(tmp, &ep->dev->regs->pciirqenb0);
177
178 return;
179 }
180
181 static int
net2280_enable(struct usb_ep * _ep,const struct usb_endpoint_descriptor * desc)182 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
183 {
184 struct net2280 *dev;
185 struct net2280_ep *ep;
186 u32 max;
187 u32 tmp = 0;
188 u32 type;
189 unsigned long flags;
190 static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
191 int ret = 0;
192
193 ep = container_of(_ep, struct net2280_ep, ep);
194 if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
195 desc->bDescriptorType != USB_DT_ENDPOINT) {
196 pr_err("%s: failed at line=%d\n", __func__, __LINE__);
197 return -EINVAL;
198 }
199 dev = ep->dev;
200 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
201 ret = -ESHUTDOWN;
202 goto print_err;
203 }
204
205 /* erratum 0119 workaround ties up an endpoint number */
206 if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
207 ret = -EDOM;
208 goto print_err;
209 }
210
211 if (dev->quirks & PLX_PCIE) {
212 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
213 ret = -EDOM;
214 goto print_err;
215 }
216 ep->is_in = !!usb_endpoint_dir_in(desc);
217 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
218 ret = -EINVAL;
219 goto print_err;
220 }
221 }
222
223 /* sanity check ep-e/ep-f since their fifos are small */
224 max = usb_endpoint_maxp(desc);
225 if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
226 ret = -ERANGE;
227 goto print_err;
228 }
229
230 spin_lock_irqsave(&dev->lock, flags);
231 _ep->maxpacket = max;
232 ep->desc = desc;
233
234 /* ep_reset() has already been called */
235 ep->stopped = 0;
236 ep->wedged = 0;
237 ep->out_overflow = 0;
238
239 /* set speed-dependent max packet; may kick in high bandwidth */
240 set_max_speed(ep, max);
241
242 /* set type, direction, address; reset fifo counters */
243 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
244
245 if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
246 tmp = readl(&ep->cfg->ep_cfg);
247 /* If USB ep number doesn't match hardware ep number */
248 if ((tmp & 0xf) != usb_endpoint_num(desc)) {
249 ret = -EINVAL;
250 spin_unlock_irqrestore(&dev->lock, flags);
251 goto print_err;
252 }
253 if (ep->is_in)
254 tmp &= ~USB3380_EP_CFG_MASK_IN;
255 else
256 tmp &= ~USB3380_EP_CFG_MASK_OUT;
257 }
258 type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
259 if (type == USB_ENDPOINT_XFER_INT) {
260 /* erratum 0105 workaround prevents hs NYET */
261 if (dev->chiprev == 0100 &&
262 dev->gadget.speed == USB_SPEED_HIGH &&
263 !(desc->bEndpointAddress & USB_DIR_IN))
264 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
265 &ep->regs->ep_rsp);
266 } else if (type == USB_ENDPOINT_XFER_BULK) {
267 /* catch some particularly blatant driver bugs */
268 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
269 (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
270 (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
271 spin_unlock_irqrestore(&dev->lock, flags);
272 ret = -ERANGE;
273 goto print_err;
274 }
275 }
276 ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
277 /* Enable this endpoint */
278 if (dev->quirks & PLX_LEGACY) {
279 tmp |= type << ENDPOINT_TYPE;
280 tmp |= desc->bEndpointAddress;
281 /* default full fifo lines */
282 tmp |= (4 << ENDPOINT_BYTE_COUNT);
283 tmp |= BIT(ENDPOINT_ENABLE);
284 ep->is_in = (tmp & USB_DIR_IN) != 0;
285 } else {
286 /* In Legacy mode, only OUT endpoints are used */
287 if (dev->enhanced_mode && ep->is_in) {
288 tmp |= type << IN_ENDPOINT_TYPE;
289 tmp |= BIT(IN_ENDPOINT_ENABLE);
290 } else {
291 tmp |= type << OUT_ENDPOINT_TYPE;
292 tmp |= BIT(OUT_ENDPOINT_ENABLE);
293 tmp |= (ep->is_in << ENDPOINT_DIRECTION);
294 }
295
296 tmp |= (4 << ENDPOINT_BYTE_COUNT);
297 if (!dev->enhanced_mode)
298 tmp |= usb_endpoint_num(desc);
299 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
300 }
301
302 /* Make sure all the registers are written before ep_rsp*/
303 wmb();
304
305 /* for OUT transfers, block the rx fifo until a read is posted */
306 if (!ep->is_in)
307 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
308 else if (!(dev->quirks & PLX_2280)) {
309 /* Added for 2282, Don't use nak packets on an in endpoint,
310 * this was ignored on 2280
311 */
312 writel(BIT(CLEAR_NAK_OUT_PACKETS) |
313 BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
314 }
315
316 if (dev->quirks & PLX_PCIE)
317 ep_clear_seqnum(ep);
318 writel(tmp, &ep->cfg->ep_cfg);
319
320 /* enable irqs */
321 if (!ep->dma) { /* pio, per-packet */
322 enable_pciirqenb(ep);
323
324 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
325 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
326 if (dev->quirks & PLX_2280)
327 tmp |= readl(&ep->regs->ep_irqenb);
328 writel(tmp, &ep->regs->ep_irqenb);
329 } else { /* dma, per-request */
330 tmp = BIT((8 + ep->num)); /* completion */
331 tmp |= readl(&dev->regs->pciirqenb1);
332 writel(tmp, &dev->regs->pciirqenb1);
333
334 /* for short OUT transfers, dma completions can't
335 * advance the queue; do it pio-style, by hand.
336 * NOTE erratum 0112 workaround #2
337 */
338 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
339 tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
340 writel(tmp, &ep->regs->ep_irqenb);
341
342 enable_pciirqenb(ep);
343 }
344 }
345
346 tmp = desc->bEndpointAddress;
347 ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
348 _ep->name, tmp & 0x0f, DIR_STRING(tmp),
349 type_string(desc->bmAttributes),
350 ep->dma ? "dma" : "pio", max);
351
352 /* pci writes may still be posted */
353 spin_unlock_irqrestore(&dev->lock, flags);
354 return ret;
355
356 print_err:
357 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
358 return ret;
359 }
360
handshake(u32 __iomem * ptr,u32 mask,u32 done,int usec)361 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
362 {
363 u32 result;
364 int ret;
365
366 ret = readl_poll_timeout_atomic(ptr, result,
367 ((result & mask) == done ||
368 result == U32_MAX),
369 1, usec);
370 if (result == U32_MAX) /* device unplugged */
371 return -ENODEV;
372
373 return ret;
374 }
375
376 static const struct usb_ep_ops net2280_ep_ops;
377
ep_reset_228x(struct net2280_regs __iomem * regs,struct net2280_ep * ep)378 static void ep_reset_228x(struct net2280_regs __iomem *regs,
379 struct net2280_ep *ep)
380 {
381 u32 tmp;
382
383 ep->desc = NULL;
384 INIT_LIST_HEAD(&ep->queue);
385
386 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
387 ep->ep.ops = &net2280_ep_ops;
388
389 /* disable the dma, irqs, endpoint... */
390 if (ep->dma) {
391 writel(0, &ep->dma->dmactl);
392 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
393 BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
394 BIT(DMA_ABORT),
395 &ep->dma->dmastat);
396
397 tmp = readl(®s->pciirqenb0);
398 tmp &= ~BIT(ep->num);
399 writel(tmp, ®s->pciirqenb0);
400 } else {
401 tmp = readl(®s->pciirqenb1);
402 tmp &= ~BIT((8 + ep->num)); /* completion */
403 writel(tmp, ®s->pciirqenb1);
404 }
405 writel(0, &ep->regs->ep_irqenb);
406
407 /* init to our chosen defaults, notably so that we NAK OUT
408 * packets until the driver queues a read (+note erratum 0112)
409 */
410 if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
411 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
412 BIT(SET_NAK_OUT_PACKETS) |
413 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
414 BIT(CLEAR_INTERRUPT_MODE);
415 } else {
416 /* added for 2282 */
417 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
418 BIT(CLEAR_NAK_OUT_PACKETS) |
419 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
420 BIT(CLEAR_INTERRUPT_MODE);
421 }
422
423 if (ep->num != 0) {
424 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
425 BIT(CLEAR_ENDPOINT_HALT);
426 }
427 writel(tmp, &ep->regs->ep_rsp);
428
429 /* scrub most status bits, and flush any fifo state */
430 if (ep->dev->quirks & PLX_2280)
431 tmp = BIT(FIFO_OVERFLOW) |
432 BIT(FIFO_UNDERFLOW);
433 else
434 tmp = 0;
435
436 writel(tmp | BIT(TIMEOUT) |
437 BIT(USB_STALL_SENT) |
438 BIT(USB_IN_NAK_SENT) |
439 BIT(USB_IN_ACK_RCVD) |
440 BIT(USB_OUT_PING_NAK_SENT) |
441 BIT(USB_OUT_ACK_SENT) |
442 BIT(FIFO_FLUSH) |
443 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
444 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
445 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
446 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
447 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
448 BIT(DATA_IN_TOKEN_INTERRUPT),
449 &ep->regs->ep_stat);
450
451 /* fifo size is handled separately */
452 }
453
ep_reset_338x(struct net2280_regs __iomem * regs,struct net2280_ep * ep)454 static void ep_reset_338x(struct net2280_regs __iomem *regs,
455 struct net2280_ep *ep)
456 {
457 u32 tmp, dmastat;
458
459 ep->desc = NULL;
460 INIT_LIST_HEAD(&ep->queue);
461
462 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
463 ep->ep.ops = &net2280_ep_ops;
464
465 /* disable the dma, irqs, endpoint... */
466 if (ep->dma) {
467 writel(0, &ep->dma->dmactl);
468 writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
469 BIT(DMA_PAUSE_DONE_INTERRUPT) |
470 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
471 BIT(DMA_TRANSACTION_DONE_INTERRUPT),
472 /* | BIT(DMA_ABORT), */
473 &ep->dma->dmastat);
474
475 dmastat = readl(&ep->dma->dmastat);
476 if (dmastat == 0x5002) {
477 ep_warn(ep->dev, "The dmastat return = %x!!\n",
478 dmastat);
479 writel(0x5a, &ep->dma->dmastat);
480 }
481
482 tmp = readl(®s->pciirqenb0);
483 tmp &= ~BIT(ep_bit[ep->num]);
484 writel(tmp, ®s->pciirqenb0);
485 } else {
486 if (ep->num < 5) {
487 tmp = readl(®s->pciirqenb1);
488 tmp &= ~BIT((8 + ep->num)); /* completion */
489 writel(tmp, ®s->pciirqenb1);
490 }
491 }
492 writel(0, &ep->regs->ep_irqenb);
493
494 writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
495 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
496 BIT(FIFO_OVERFLOW) |
497 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
498 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
499 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
500 BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
501
502 tmp = readl(&ep->cfg->ep_cfg);
503 if (ep->is_in)
504 tmp &= ~USB3380_EP_CFG_MASK_IN;
505 else
506 tmp &= ~USB3380_EP_CFG_MASK_OUT;
507 writel(tmp, &ep->cfg->ep_cfg);
508 }
509
510 static void nuke(struct net2280_ep *);
511
net2280_disable(struct usb_ep * _ep)512 static int net2280_disable(struct usb_ep *_ep)
513 {
514 struct net2280_ep *ep;
515 unsigned long flags;
516
517 ep = container_of(_ep, struct net2280_ep, ep);
518 if (!_ep || _ep->name == ep0name) {
519 pr_err("%s: Invalid ep=%p\n", __func__, _ep);
520 return -EINVAL;
521 }
522 spin_lock_irqsave(&ep->dev->lock, flags);
523 nuke(ep);
524
525 if (ep->dev->quirks & PLX_PCIE)
526 ep_reset_338x(ep->dev->regs, ep);
527 else
528 ep_reset_228x(ep->dev->regs, ep);
529
530 ep_vdbg(ep->dev, "disabled %s %s\n",
531 ep->dma ? "dma" : "pio", _ep->name);
532
533 /* synch memory views with the device */
534 (void)readl(&ep->cfg->ep_cfg);
535
536 if (!ep->dma && ep->num >= 1 && ep->num <= 4)
537 ep->dma = &ep->dev->dma[ep->num - 1];
538
539 spin_unlock_irqrestore(&ep->dev->lock, flags);
540 return 0;
541 }
542
543 /*-------------------------------------------------------------------------*/
544
545 static struct usb_request
net2280_alloc_request(struct usb_ep * _ep,gfp_t gfp_flags)546 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
547 {
548 struct net2280_ep *ep;
549 struct net2280_request *req;
550
551 if (!_ep) {
552 pr_err("%s: Invalid ep\n", __func__);
553 return NULL;
554 }
555 ep = container_of(_ep, struct net2280_ep, ep);
556
557 req = kzalloc(sizeof(*req), gfp_flags);
558 if (!req)
559 return NULL;
560
561 INIT_LIST_HEAD(&req->queue);
562
563 /* this dma descriptor may be swapped with the previous dummy */
564 if (ep->dma) {
565 struct net2280_dma *td;
566
567 td = dma_pool_alloc(ep->dev->requests, gfp_flags,
568 &req->td_dma);
569 if (!td) {
570 kfree(req);
571 return NULL;
572 }
573 td->dmacount = 0; /* not VALID */
574 td->dmadesc = td->dmaaddr;
575 req->td = td;
576 }
577 return &req->req;
578 }
579
net2280_free_request(struct usb_ep * _ep,struct usb_request * _req)580 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
581 {
582 struct net2280_ep *ep;
583 struct net2280_request *req;
584
585 ep = container_of(_ep, struct net2280_ep, ep);
586 if (!_ep || !_req) {
587 dev_err(&ep->dev->pdev->dev, "%s: Invalid ep=%p or req=%p\n",
588 __func__, _ep, _req);
589 return;
590 }
591
592 req = container_of(_req, struct net2280_request, req);
593 WARN_ON(!list_empty(&req->queue));
594 if (req->td)
595 dma_pool_free(ep->dev->requests, req->td, req->td_dma);
596 kfree(req);
597 }
598
599 /*-------------------------------------------------------------------------*/
600
601 /* load a packet into the fifo we use for usb IN transfers.
602 * works for all endpoints.
603 *
604 * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
605 * at a time, but this code is simpler because it knows it only writes
606 * one packet. ep-a..ep-d should use dma instead.
607 */
write_fifo(struct net2280_ep * ep,struct usb_request * req)608 static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
609 {
610 struct net2280_ep_regs __iomem *regs = ep->regs;
611 u8 *buf;
612 u32 tmp;
613 unsigned count, total;
614
615 /* INVARIANT: fifo is currently empty. (testable) */
616
617 if (req) {
618 buf = req->buf + req->actual;
619 prefetch(buf);
620 total = req->length - req->actual;
621 } else {
622 total = 0;
623 buf = NULL;
624 }
625
626 /* write just one packet at a time */
627 count = ep->ep.maxpacket;
628 if (count > total) /* min() cannot be used on a bitfield */
629 count = total;
630
631 ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
632 ep->ep.name, count,
633 (count != ep->ep.maxpacket) ? " (short)" : "",
634 req);
635 while (count >= 4) {
636 /* NOTE be careful if you try to align these. fifo lines
637 * should normally be full (4 bytes) and successive partial
638 * lines are ok only in certain cases.
639 */
640 tmp = get_unaligned((u32 *)buf);
641 cpu_to_le32s(&tmp);
642 writel(tmp, ®s->ep_data);
643 buf += 4;
644 count -= 4;
645 }
646
647 /* last fifo entry is "short" unless we wrote a full packet.
648 * also explicitly validate last word in (periodic) transfers
649 * when maxpacket is not a multiple of 4 bytes.
650 */
651 if (count || total < ep->ep.maxpacket) {
652 tmp = count ? get_unaligned((u32 *)buf) : count;
653 cpu_to_le32s(&tmp);
654 set_fifo_bytecount(ep, count & 0x03);
655 writel(tmp, ®s->ep_data);
656 }
657
658 /* pci writes may still be posted */
659 }
660
661 /* work around erratum 0106: PCI and USB race over the OUT fifo.
662 * caller guarantees chiprev 0100, out endpoint is NAKing, and
663 * there's no real data in the fifo.
664 *
665 * NOTE: also used in cases where that erratum doesn't apply:
666 * where the host wrote "too much" data to us.
667 */
out_flush(struct net2280_ep * ep)668 static void out_flush(struct net2280_ep *ep)
669 {
670 u32 __iomem *statp;
671 u32 tmp;
672
673 statp = &ep->regs->ep_stat;
674
675 tmp = readl(statp);
676 if (tmp & BIT(NAK_OUT_PACKETS)) {
677 ep_dbg(ep->dev, "%s %s %08x !NAK\n",
678 ep->ep.name, __func__, tmp);
679 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
680 }
681
682 writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
683 BIT(DATA_PACKET_RECEIVED_INTERRUPT),
684 statp);
685 writel(BIT(FIFO_FLUSH), statp);
686 /* Make sure that stap is written */
687 mb();
688 tmp = readl(statp);
689 if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
690 /* high speed did bulk NYET; fifo isn't filling */
691 ep->dev->gadget.speed == USB_SPEED_FULL) {
692 unsigned usec;
693
694 usec = 50; /* 64 byte bulk/interrupt */
695 handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
696 BIT(USB_OUT_PING_NAK_SENT), usec);
697 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
698 }
699 }
700
701 /* unload packet(s) from the fifo we use for usb OUT transfers.
702 * returns true iff the request completed, because of short packet
703 * or the request buffer having filled with full packets.
704 *
705 * for ep-a..ep-d this will read multiple packets out when they
706 * have been accepted.
707 */
read_fifo(struct net2280_ep * ep,struct net2280_request * req)708 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
709 {
710 struct net2280_ep_regs __iomem *regs = ep->regs;
711 u8 *buf = req->req.buf + req->req.actual;
712 unsigned count, tmp, is_short;
713 unsigned cleanup = 0, prevent = 0;
714
715 /* erratum 0106 ... packets coming in during fifo reads might
716 * be incompletely rejected. not all cases have workarounds.
717 */
718 if (ep->dev->chiprev == 0x0100 &&
719 ep->dev->gadget.speed == USB_SPEED_FULL) {
720 udelay(1);
721 tmp = readl(&ep->regs->ep_stat);
722 if ((tmp & BIT(NAK_OUT_PACKETS)))
723 cleanup = 1;
724 else if ((tmp & BIT(FIFO_FULL))) {
725 start_out_naking(ep);
726 prevent = 1;
727 }
728 /* else: hope we don't see the problem */
729 }
730
731 /* never overflow the rx buffer. the fifo reads packets until
732 * it sees a short one; we might not be ready for them all.
733 */
734 prefetchw(buf);
735 count = readl(®s->ep_avail);
736 if (unlikely(count == 0)) {
737 udelay(1);
738 tmp = readl(&ep->regs->ep_stat);
739 count = readl(®s->ep_avail);
740 /* handled that data already? */
741 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
742 return 0;
743 }
744
745 tmp = req->req.length - req->req.actual;
746 if (count > tmp) {
747 /* as with DMA, data overflow gets flushed */
748 if ((tmp % ep->ep.maxpacket) != 0) {
749 ep_err(ep->dev,
750 "%s out fifo %d bytes, expected %d\n",
751 ep->ep.name, count, tmp);
752 req->req.status = -EOVERFLOW;
753 cleanup = 1;
754 /* NAK_OUT_PACKETS will be set, so flushing is safe;
755 * the next read will start with the next packet
756 */
757 } /* else it's a ZLP, no worries */
758 count = tmp;
759 }
760 req->req.actual += count;
761
762 is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
763
764 ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
765 ep->ep.name, count, is_short ? " (short)" : "",
766 cleanup ? " flush" : "", prevent ? " nak" : "",
767 req, req->req.actual, req->req.length);
768
769 while (count >= 4) {
770 tmp = readl(®s->ep_data);
771 cpu_to_le32s(&tmp);
772 put_unaligned(tmp, (u32 *)buf);
773 buf += 4;
774 count -= 4;
775 }
776 if (count) {
777 tmp = readl(®s->ep_data);
778 /* LE conversion is implicit here: */
779 do {
780 *buf++ = (u8) tmp;
781 tmp >>= 8;
782 } while (--count);
783 }
784 if (cleanup)
785 out_flush(ep);
786 if (prevent) {
787 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
788 (void) readl(&ep->regs->ep_rsp);
789 }
790
791 return is_short || req->req.actual == req->req.length;
792 }
793
794 /* fill out dma descriptor to match a given request */
fill_dma_desc(struct net2280_ep * ep,struct net2280_request * req,int valid)795 static void fill_dma_desc(struct net2280_ep *ep,
796 struct net2280_request *req, int valid)
797 {
798 struct net2280_dma *td = req->td;
799 u32 dmacount = req->req.length;
800
801 /* don't let DMA continue after a short OUT packet,
802 * so overruns can't affect the next transfer.
803 * in case of overruns on max-size packets, we can't
804 * stop the fifo from filling but we can flush it.
805 */
806 if (ep->is_in)
807 dmacount |= BIT(DMA_DIRECTION);
808 if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
809 !(ep->dev->quirks & PLX_2280))
810 dmacount |= BIT(END_OF_CHAIN);
811
812 req->valid = valid;
813 if (valid)
814 dmacount |= BIT(VALID_BIT);
815 dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
816
817 /* td->dmadesc = previously set by caller */
818 td->dmaaddr = cpu_to_le32 (req->req.dma);
819
820 /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
821 wmb();
822 td->dmacount = cpu_to_le32(dmacount);
823 }
824
825 static const u32 dmactl_default =
826 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
827 BIT(DMA_CLEAR_COUNT_ENABLE) |
828 /* erratum 0116 workaround part 1 (use POLLING) */
829 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
830 BIT(DMA_VALID_BIT_POLLING_ENABLE) |
831 BIT(DMA_VALID_BIT_ENABLE) |
832 BIT(DMA_SCATTER_GATHER_ENABLE) |
833 /* erratum 0116 workaround part 2 (no AUTOSTART) */
834 BIT(DMA_ENABLE);
835
spin_stop_dma(struct net2280_dma_regs __iomem * dma)836 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
837 {
838 handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
839 }
840
stop_dma(struct net2280_dma_regs __iomem * dma)841 static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
842 {
843 writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
844 spin_stop_dma(dma);
845 }
846
start_queue(struct net2280_ep * ep,u32 dmactl,u32 td_dma)847 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
848 {
849 struct net2280_dma_regs __iomem *dma = ep->dma;
850 unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
851
852 if (!(ep->dev->quirks & PLX_2280))
853 tmp |= BIT(END_OF_CHAIN);
854
855 writel(tmp, &dma->dmacount);
856 writel(readl(&dma->dmastat), &dma->dmastat);
857
858 writel(td_dma, &dma->dmadesc);
859 if (ep->dev->quirks & PLX_PCIE)
860 dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
861 writel(dmactl, &dma->dmactl);
862
863 /* erratum 0116 workaround part 3: pci arbiter away from net2280 */
864 (void) readl(&ep->dev->pci->pcimstctl);
865
866 writel(BIT(DMA_START), &dma->dmastat);
867 }
868
start_dma(struct net2280_ep * ep,struct net2280_request * req)869 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
870 {
871 u32 tmp;
872 struct net2280_dma_regs __iomem *dma = ep->dma;
873
874 /* FIXME can't use DMA for ZLPs */
875
876 /* on this path we "know" there's no dma active (yet) */
877 WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
878 writel(0, &ep->dma->dmactl);
879
880 /* previous OUT packet might have been short */
881 if (!ep->is_in && (readl(&ep->regs->ep_stat) &
882 BIT(NAK_OUT_PACKETS))) {
883 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
884 &ep->regs->ep_stat);
885
886 tmp = readl(&ep->regs->ep_avail);
887 if (tmp) {
888 writel(readl(&dma->dmastat), &dma->dmastat);
889
890 /* transfer all/some fifo data */
891 writel(req->req.dma, &dma->dmaaddr);
892 tmp = min(tmp, req->req.length);
893
894 /* dma irq, faking scatterlist status */
895 req->td->dmacount = cpu_to_le32(req->req.length - tmp);
896 writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
897 &dma->dmacount);
898 req->td->dmadesc = 0;
899 req->valid = 1;
900
901 writel(BIT(DMA_ENABLE), &dma->dmactl);
902 writel(BIT(DMA_START), &dma->dmastat);
903 return;
904 }
905 stop_out_naking(ep);
906 }
907
908 tmp = dmactl_default;
909
910 /* force packet boundaries between dma requests, but prevent the
911 * controller from automagically writing a last "short" packet
912 * (zero length) unless the driver explicitly said to do that.
913 */
914 if (ep->is_in) {
915 if (likely((req->req.length % ep->ep.maxpacket) ||
916 req->req.zero)){
917 tmp |= BIT(DMA_FIFO_VALIDATE);
918 ep->in_fifo_validate = 1;
919 } else
920 ep->in_fifo_validate = 0;
921 }
922
923 /* init req->td, pointing to the current dummy */
924 req->td->dmadesc = cpu_to_le32 (ep->td_dma);
925 fill_dma_desc(ep, req, 1);
926
927 req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
928
929 start_queue(ep, tmp, req->td_dma);
930 }
931
932 static inline void
queue_dma(struct net2280_ep * ep,struct net2280_request * req,int valid)933 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
934 {
935 struct net2280_dma *end;
936 dma_addr_t tmp;
937
938 /* swap new dummy for old, link; fill and maybe activate */
939 end = ep->dummy;
940 ep->dummy = req->td;
941 req->td = end;
942
943 tmp = ep->td_dma;
944 ep->td_dma = req->td_dma;
945 req->td_dma = tmp;
946
947 end->dmadesc = cpu_to_le32 (ep->td_dma);
948
949 fill_dma_desc(ep, req, valid);
950 }
951
952 static void
done(struct net2280_ep * ep,struct net2280_request * req,int status)953 done(struct net2280_ep *ep, struct net2280_request *req, int status)
954 {
955 struct net2280 *dev;
956 unsigned stopped = ep->stopped;
957
958 list_del_init(&req->queue);
959
960 if (req->req.status == -EINPROGRESS)
961 req->req.status = status;
962 else
963 status = req->req.status;
964
965 dev = ep->dev;
966 if (ep->dma)
967 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
968
969 if (status && status != -ESHUTDOWN)
970 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
971 ep->ep.name, &req->req, status,
972 req->req.actual, req->req.length);
973
974 /* don't modify queue heads during completion callback */
975 ep->stopped = 1;
976 spin_unlock(&dev->lock);
977 usb_gadget_giveback_request(&ep->ep, &req->req);
978 spin_lock(&dev->lock);
979 ep->stopped = stopped;
980 }
981
982 /*-------------------------------------------------------------------------*/
983
984 static int
net2280_queue(struct usb_ep * _ep,struct usb_request * _req,gfp_t gfp_flags)985 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
986 {
987 struct net2280_request *req;
988 struct net2280_ep *ep;
989 struct net2280 *dev;
990 unsigned long flags;
991 int ret = 0;
992
993 /* we always require a cpu-view buffer, so that we can
994 * always use pio (as fallback or whatever).
995 */
996 ep = container_of(_ep, struct net2280_ep, ep);
997 if (!_ep || (!ep->desc && ep->num != 0)) {
998 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
999 return -EINVAL;
1000 }
1001 req = container_of(_req, struct net2280_request, req);
1002 if (!_req || !_req->complete || !_req->buf ||
1003 !list_empty(&req->queue)) {
1004 ret = -EINVAL;
1005 goto print_err;
1006 }
1007 if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1008 ret = -EDOM;
1009 goto print_err;
1010 }
1011 dev = ep->dev;
1012 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1013 ret = -ESHUTDOWN;
1014 goto print_err;
1015 }
1016
1017 /* FIXME implement PIO fallback for ZLPs with DMA */
1018 if (ep->dma && _req->length == 0) {
1019 ret = -EOPNOTSUPP;
1020 goto print_err;
1021 }
1022
1023 /* set up dma mapping in case the caller didn't */
1024 if (ep->dma) {
1025 ret = usb_gadget_map_request(&dev->gadget, _req,
1026 ep->is_in);
1027 if (ret)
1028 goto print_err;
1029 }
1030
1031 ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1032 _ep->name, _req, _req->length, _req->buf);
1033
1034 spin_lock_irqsave(&dev->lock, flags);
1035
1036 _req->status = -EINPROGRESS;
1037 _req->actual = 0;
1038
1039 /* kickstart this i/o queue? */
1040 if (list_empty(&ep->queue) && !ep->stopped &&
1041 !((dev->quirks & PLX_PCIE) && ep->dma &&
1042 (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1043
1044 /* use DMA if the endpoint supports it, else pio */
1045 if (ep->dma)
1046 start_dma(ep, req);
1047 else {
1048 /* maybe there's no control data, just status ack */
1049 if (ep->num == 0 && _req->length == 0) {
1050 allow_status(ep);
1051 done(ep, req, 0);
1052 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1053 goto done;
1054 }
1055
1056 /* PIO ... stuff the fifo, or unblock it. */
1057 if (ep->is_in)
1058 write_fifo(ep, _req);
1059 else {
1060 u32 s;
1061
1062 /* OUT FIFO might have packet(s) buffered */
1063 s = readl(&ep->regs->ep_stat);
1064 if ((s & BIT(FIFO_EMPTY)) == 0) {
1065 /* note: _req->short_not_ok is
1066 * ignored here since PIO _always_
1067 * stops queue advance here, and
1068 * _req->status doesn't change for
1069 * short reads (only _req->actual)
1070 */
1071 if (read_fifo(ep, req) &&
1072 ep->num == 0) {
1073 done(ep, req, 0);
1074 allow_status(ep);
1075 /* don't queue it */
1076 req = NULL;
1077 } else if (read_fifo(ep, req) &&
1078 ep->num != 0) {
1079 done(ep, req, 0);
1080 req = NULL;
1081 } else
1082 s = readl(&ep->regs->ep_stat);
1083 }
1084
1085 /* don't NAK, let the fifo fill */
1086 if (req && (s & BIT(NAK_OUT_PACKETS)))
1087 writel(BIT(CLEAR_NAK_OUT_PACKETS),
1088 &ep->regs->ep_rsp);
1089 }
1090 }
1091
1092 } else if (ep->dma) {
1093 int valid = 1;
1094
1095 if (ep->is_in) {
1096 int expect;
1097
1098 /* preventing magic zlps is per-engine state, not
1099 * per-transfer; irq logic must recover hiccups.
1100 */
1101 expect = likely(req->req.zero ||
1102 (req->req.length % ep->ep.maxpacket));
1103 if (expect != ep->in_fifo_validate)
1104 valid = 0;
1105 }
1106 queue_dma(ep, req, valid);
1107
1108 } /* else the irq handler advances the queue. */
1109
1110 ep->responded = 1;
1111 if (req)
1112 list_add_tail(&req->queue, &ep->queue);
1113 done:
1114 spin_unlock_irqrestore(&dev->lock, flags);
1115
1116 /* pci writes may still be posted */
1117 return ret;
1118
1119 print_err:
1120 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1121 return ret;
1122 }
1123
1124 static inline void
dma_done(struct net2280_ep * ep,struct net2280_request * req,u32 dmacount,int status)1125 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1126 int status)
1127 {
1128 req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1129 done(ep, req, status);
1130 }
1131
scan_dma_completions(struct net2280_ep * ep)1132 static int scan_dma_completions(struct net2280_ep *ep)
1133 {
1134 int num_completed = 0;
1135
1136 /* only look at descriptors that were "naturally" retired,
1137 * so fifo and list head state won't matter
1138 */
1139 while (!list_empty(&ep->queue)) {
1140 struct net2280_request *req;
1141 u32 req_dma_count;
1142
1143 req = list_entry(ep->queue.next,
1144 struct net2280_request, queue);
1145 if (!req->valid)
1146 break;
1147 rmb();
1148 req_dma_count = le32_to_cpup(&req->td->dmacount);
1149 if ((req_dma_count & BIT(VALID_BIT)) != 0)
1150 break;
1151
1152 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1153 * cases where DMA must be aborted; this code handles
1154 * all non-abort DMA completions.
1155 */
1156 if (unlikely(req->td->dmadesc == 0)) {
1157 /* paranoia */
1158 u32 const ep_dmacount = readl(&ep->dma->dmacount);
1159
1160 if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1161 break;
1162 /* single transfer mode */
1163 dma_done(ep, req, req_dma_count, 0);
1164 num_completed++;
1165 break;
1166 } else if (!ep->is_in &&
1167 (req->req.length % ep->ep.maxpacket) &&
1168 !(ep->dev->quirks & PLX_PCIE)) {
1169
1170 u32 const ep_stat = readl(&ep->regs->ep_stat);
1171 /* AVOID TROUBLE HERE by not issuing short reads from
1172 * your gadget driver. That helps avoids errata 0121,
1173 * 0122, and 0124; not all cases trigger the warning.
1174 */
1175 if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) {
1176 ep_warn(ep->dev, "%s lost packet sync!\n",
1177 ep->ep.name);
1178 req->req.status = -EOVERFLOW;
1179 } else {
1180 u32 const ep_avail = readl(&ep->regs->ep_avail);
1181 if (ep_avail) {
1182 /* fifo gets flushed later */
1183 ep->out_overflow = 1;
1184 ep_dbg(ep->dev,
1185 "%s dma, discard %d len %d\n",
1186 ep->ep.name, ep_avail,
1187 req->req.length);
1188 req->req.status = -EOVERFLOW;
1189 }
1190 }
1191 }
1192 dma_done(ep, req, req_dma_count, 0);
1193 num_completed++;
1194 }
1195
1196 return num_completed;
1197 }
1198
restart_dma(struct net2280_ep * ep)1199 static void restart_dma(struct net2280_ep *ep)
1200 {
1201 struct net2280_request *req;
1202
1203 if (ep->stopped)
1204 return;
1205 req = list_entry(ep->queue.next, struct net2280_request, queue);
1206
1207 start_dma(ep, req);
1208 }
1209
abort_dma(struct net2280_ep * ep)1210 static void abort_dma(struct net2280_ep *ep)
1211 {
1212 /* abort the current transfer */
1213 if (likely(!list_empty(&ep->queue))) {
1214 /* FIXME work around errata 0121, 0122, 0124 */
1215 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1216 spin_stop_dma(ep->dma);
1217 } else
1218 stop_dma(ep->dma);
1219 scan_dma_completions(ep);
1220 }
1221
1222 /* dequeue ALL requests */
nuke(struct net2280_ep * ep)1223 static void nuke(struct net2280_ep *ep)
1224 {
1225 struct net2280_request *req;
1226
1227 /* called with spinlock held */
1228 ep->stopped = 1;
1229 if (ep->dma)
1230 abort_dma(ep);
1231 while (!list_empty(&ep->queue)) {
1232 req = list_entry(ep->queue.next,
1233 struct net2280_request,
1234 queue);
1235 done(ep, req, -ESHUTDOWN);
1236 }
1237 }
1238
1239 /* dequeue JUST ONE request */
net2280_dequeue(struct usb_ep * _ep,struct usb_request * _req)1240 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1241 {
1242 struct net2280_ep *ep;
1243 struct net2280_request *req;
1244 unsigned long flags;
1245 u32 dmactl;
1246 int stopped;
1247
1248 ep = container_of(_ep, struct net2280_ep, ep);
1249 if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1250 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1251 __func__, _ep, _req);
1252 return -EINVAL;
1253 }
1254
1255 spin_lock_irqsave(&ep->dev->lock, flags);
1256 stopped = ep->stopped;
1257
1258 /* quiesce dma while we patch the queue */
1259 dmactl = 0;
1260 ep->stopped = 1;
1261 if (ep->dma) {
1262 dmactl = readl(&ep->dma->dmactl);
1263 /* WARNING erratum 0127 may kick in ... */
1264 stop_dma(ep->dma);
1265 scan_dma_completions(ep);
1266 }
1267
1268 /* make sure it's still queued on this endpoint */
1269 list_for_each_entry(req, &ep->queue, queue) {
1270 if (&req->req == _req)
1271 break;
1272 }
1273 if (&req->req != _req) {
1274 ep->stopped = stopped;
1275 spin_unlock_irqrestore(&ep->dev->lock, flags);
1276 ep_dbg(ep->dev, "%s: Request mismatch\n", __func__);
1277 return -EINVAL;
1278 }
1279
1280 /* queue head may be partially complete. */
1281 if (ep->queue.next == &req->queue) {
1282 if (ep->dma) {
1283 ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1284 _req->status = -ECONNRESET;
1285 abort_dma(ep);
1286 if (likely(ep->queue.next == &req->queue)) {
1287 /* NOTE: misreports single-transfer mode*/
1288 req->td->dmacount = 0; /* invalidate */
1289 dma_done(ep, req,
1290 readl(&ep->dma->dmacount),
1291 -ECONNRESET);
1292 }
1293 } else {
1294 ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1295 done(ep, req, -ECONNRESET);
1296 }
1297 req = NULL;
1298 }
1299
1300 if (req)
1301 done(ep, req, -ECONNRESET);
1302 ep->stopped = stopped;
1303
1304 if (ep->dma) {
1305 /* turn off dma on inactive queues */
1306 if (list_empty(&ep->queue))
1307 stop_dma(ep->dma);
1308 else if (!ep->stopped) {
1309 /* resume current request, or start new one */
1310 if (req)
1311 writel(dmactl, &ep->dma->dmactl);
1312 else
1313 start_dma(ep, list_entry(ep->queue.next,
1314 struct net2280_request, queue));
1315 }
1316 }
1317
1318 spin_unlock_irqrestore(&ep->dev->lock, flags);
1319 return 0;
1320 }
1321
1322 /*-------------------------------------------------------------------------*/
1323
1324 static int net2280_fifo_status(struct usb_ep *_ep);
1325
1326 static int
net2280_set_halt_and_wedge(struct usb_ep * _ep,int value,int wedged)1327 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1328 {
1329 struct net2280_ep *ep;
1330 unsigned long flags;
1331 int retval = 0;
1332
1333 ep = container_of(_ep, struct net2280_ep, ep);
1334 if (!_ep || (!ep->desc && ep->num != 0)) {
1335 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1336 return -EINVAL;
1337 }
1338 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1339 retval = -ESHUTDOWN;
1340 goto print_err;
1341 }
1342 if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1343 == USB_ENDPOINT_XFER_ISOC) {
1344 retval = -EINVAL;
1345 goto print_err;
1346 }
1347
1348 spin_lock_irqsave(&ep->dev->lock, flags);
1349 if (!list_empty(&ep->queue)) {
1350 retval = -EAGAIN;
1351 goto print_unlock;
1352 } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1353 retval = -EAGAIN;
1354 goto print_unlock;
1355 } else {
1356 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1357 value ? "set" : "clear",
1358 wedged ? "wedge" : "halt");
1359 /* set/clear, then synch memory views with the device */
1360 if (value) {
1361 if (ep->num == 0)
1362 ep->dev->protocol_stall = 1;
1363 else
1364 set_halt(ep);
1365 if (wedged)
1366 ep->wedged = 1;
1367 } else {
1368 clear_halt(ep);
1369 if (ep->dev->quirks & PLX_PCIE &&
1370 !list_empty(&ep->queue) && ep->td_dma)
1371 restart_dma(ep);
1372 ep->wedged = 0;
1373 }
1374 (void) readl(&ep->regs->ep_rsp);
1375 }
1376 spin_unlock_irqrestore(&ep->dev->lock, flags);
1377
1378 return retval;
1379
1380 print_unlock:
1381 spin_unlock_irqrestore(&ep->dev->lock, flags);
1382 print_err:
1383 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1384 return retval;
1385 }
1386
net2280_set_halt(struct usb_ep * _ep,int value)1387 static int net2280_set_halt(struct usb_ep *_ep, int value)
1388 {
1389 return net2280_set_halt_and_wedge(_ep, value, 0);
1390 }
1391
net2280_set_wedge(struct usb_ep * _ep)1392 static int net2280_set_wedge(struct usb_ep *_ep)
1393 {
1394 if (!_ep || _ep->name == ep0name) {
1395 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1396 return -EINVAL;
1397 }
1398 return net2280_set_halt_and_wedge(_ep, 1, 1);
1399 }
1400
net2280_fifo_status(struct usb_ep * _ep)1401 static int net2280_fifo_status(struct usb_ep *_ep)
1402 {
1403 struct net2280_ep *ep;
1404 u32 avail;
1405
1406 ep = container_of(_ep, struct net2280_ep, ep);
1407 if (!_ep || (!ep->desc && ep->num != 0)) {
1408 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1409 return -ENODEV;
1410 }
1411 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1412 dev_err(&ep->dev->pdev->dev,
1413 "%s: Invalid driver=%p or speed=%d\n",
1414 __func__, ep->dev->driver, ep->dev->gadget.speed);
1415 return -ESHUTDOWN;
1416 }
1417
1418 avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1419 if (avail > ep->fifo_size) {
1420 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1421 return -EOVERFLOW;
1422 }
1423 if (ep->is_in)
1424 avail = ep->fifo_size - avail;
1425 return avail;
1426 }
1427
net2280_fifo_flush(struct usb_ep * _ep)1428 static void net2280_fifo_flush(struct usb_ep *_ep)
1429 {
1430 struct net2280_ep *ep;
1431
1432 ep = container_of(_ep, struct net2280_ep, ep);
1433 if (!_ep || (!ep->desc && ep->num != 0)) {
1434 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1435 return;
1436 }
1437 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1438 dev_err(&ep->dev->pdev->dev,
1439 "%s: Invalid driver=%p or speed=%d\n",
1440 __func__, ep->dev->driver, ep->dev->gadget.speed);
1441 return;
1442 }
1443
1444 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1445 (void) readl(&ep->regs->ep_rsp);
1446 }
1447
1448 static const struct usb_ep_ops net2280_ep_ops = {
1449 .enable = net2280_enable,
1450 .disable = net2280_disable,
1451
1452 .alloc_request = net2280_alloc_request,
1453 .free_request = net2280_free_request,
1454
1455 .queue = net2280_queue,
1456 .dequeue = net2280_dequeue,
1457
1458 .set_halt = net2280_set_halt,
1459 .set_wedge = net2280_set_wedge,
1460 .fifo_status = net2280_fifo_status,
1461 .fifo_flush = net2280_fifo_flush,
1462 };
1463
1464 /*-------------------------------------------------------------------------*/
1465
net2280_get_frame(struct usb_gadget * _gadget)1466 static int net2280_get_frame(struct usb_gadget *_gadget)
1467 {
1468 struct net2280 *dev;
1469 unsigned long flags;
1470 u16 retval;
1471
1472 if (!_gadget)
1473 return -ENODEV;
1474 dev = container_of(_gadget, struct net2280, gadget);
1475 spin_lock_irqsave(&dev->lock, flags);
1476 retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1477 spin_unlock_irqrestore(&dev->lock, flags);
1478 return retval;
1479 }
1480
net2280_wakeup(struct usb_gadget * _gadget)1481 static int net2280_wakeup(struct usb_gadget *_gadget)
1482 {
1483 struct net2280 *dev;
1484 u32 tmp;
1485 unsigned long flags;
1486
1487 if (!_gadget)
1488 return 0;
1489 dev = container_of(_gadget, struct net2280, gadget);
1490
1491 spin_lock_irqsave(&dev->lock, flags);
1492 tmp = readl(&dev->usb->usbctl);
1493 if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1494 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1495 spin_unlock_irqrestore(&dev->lock, flags);
1496
1497 /* pci writes may still be posted */
1498 return 0;
1499 }
1500
net2280_set_selfpowered(struct usb_gadget * _gadget,int value)1501 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1502 {
1503 struct net2280 *dev;
1504 u32 tmp;
1505 unsigned long flags;
1506
1507 if (!_gadget)
1508 return 0;
1509 dev = container_of(_gadget, struct net2280, gadget);
1510
1511 spin_lock_irqsave(&dev->lock, flags);
1512 tmp = readl(&dev->usb->usbctl);
1513 if (value) {
1514 tmp |= BIT(SELF_POWERED_STATUS);
1515 _gadget->is_selfpowered = 1;
1516 } else {
1517 tmp &= ~BIT(SELF_POWERED_STATUS);
1518 _gadget->is_selfpowered = 0;
1519 }
1520 writel(tmp, &dev->usb->usbctl);
1521 spin_unlock_irqrestore(&dev->lock, flags);
1522
1523 return 0;
1524 }
1525
net2280_pullup(struct usb_gadget * _gadget,int is_on)1526 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1527 {
1528 struct net2280 *dev;
1529 u32 tmp;
1530 unsigned long flags;
1531
1532 if (!_gadget)
1533 return -ENODEV;
1534 dev = container_of(_gadget, struct net2280, gadget);
1535
1536 spin_lock_irqsave(&dev->lock, flags);
1537 tmp = readl(&dev->usb->usbctl);
1538 dev->softconnect = (is_on != 0);
1539 if (is_on) {
1540 ep0_start(dev);
1541 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1542 } else {
1543 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1544 stop_activity(dev, NULL);
1545 }
1546
1547 spin_unlock_irqrestore(&dev->lock, flags);
1548
1549 return 0;
1550 }
1551
net2280_match_ep(struct usb_gadget * _gadget,struct usb_endpoint_descriptor * desc,struct usb_ss_ep_comp_descriptor * ep_comp)1552 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1553 struct usb_endpoint_descriptor *desc,
1554 struct usb_ss_ep_comp_descriptor *ep_comp)
1555 {
1556 char name[8];
1557 struct usb_ep *ep;
1558
1559 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1560 /* ep-e, ep-f are PIO with only 64 byte fifos */
1561 ep = gadget_find_ep_by_name(_gadget, "ep-e");
1562 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1563 return ep;
1564 ep = gadget_find_ep_by_name(_gadget, "ep-f");
1565 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1566 return ep;
1567 }
1568
1569 /* USB3380: Only first four endpoints have DMA channels. Allocate
1570 * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1571 * endpoints use DMA hw endpoints.
1572 */
1573 if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1574 usb_endpoint_dir_in(desc)) {
1575 ep = gadget_find_ep_by_name(_gadget, "ep2in");
1576 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1577 return ep;
1578 ep = gadget_find_ep_by_name(_gadget, "ep4in");
1579 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1580 return ep;
1581 } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1582 !usb_endpoint_dir_in(desc)) {
1583 ep = gadget_find_ep_by_name(_gadget, "ep1out");
1584 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1585 return ep;
1586 ep = gadget_find_ep_by_name(_gadget, "ep3out");
1587 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1588 return ep;
1589 } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1590 usb_endpoint_dir_in(desc)) {
1591 ep = gadget_find_ep_by_name(_gadget, "ep1in");
1592 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1593 return ep;
1594 ep = gadget_find_ep_by_name(_gadget, "ep3in");
1595 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1596 return ep;
1597 } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1598 !usb_endpoint_dir_in(desc)) {
1599 ep = gadget_find_ep_by_name(_gadget, "ep2out");
1600 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1601 return ep;
1602 ep = gadget_find_ep_by_name(_gadget, "ep4out");
1603 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1604 return ep;
1605 }
1606
1607 /* USB3380: use same address for usb and hardware endpoints */
1608 snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1609 usb_endpoint_dir_in(desc) ? "in" : "out");
1610 ep = gadget_find_ep_by_name(_gadget, name);
1611 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1612 return ep;
1613
1614 return NULL;
1615 }
1616
1617 static int net2280_start(struct usb_gadget *_gadget,
1618 struct usb_gadget_driver *driver);
1619 static int net2280_stop(struct usb_gadget *_gadget);
1620
1621 static const struct usb_gadget_ops net2280_ops = {
1622 .get_frame = net2280_get_frame,
1623 .wakeup = net2280_wakeup,
1624 .set_selfpowered = net2280_set_selfpowered,
1625 .pullup = net2280_pullup,
1626 .udc_start = net2280_start,
1627 .udc_stop = net2280_stop,
1628 .match_ep = net2280_match_ep,
1629 };
1630
1631 /*-------------------------------------------------------------------------*/
1632
1633 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1634
1635 /* FIXME move these into procfs, and use seq_file.
1636 * Sysfs _still_ doesn't behave for arbitrarily sized files,
1637 * and also doesn't help products using this with 2.4 kernels.
1638 */
1639
1640 /* "function" sysfs attribute */
function_show(struct device * _dev,struct device_attribute * attr,char * buf)1641 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1642 char *buf)
1643 {
1644 struct net2280 *dev = dev_get_drvdata(_dev);
1645
1646 if (!dev->driver || !dev->driver->function ||
1647 strlen(dev->driver->function) > PAGE_SIZE)
1648 return 0;
1649 return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1650 }
1651 static DEVICE_ATTR_RO(function);
1652
registers_show(struct device * _dev,struct device_attribute * attr,char * buf)1653 static ssize_t registers_show(struct device *_dev,
1654 struct device_attribute *attr, char *buf)
1655 {
1656 struct net2280 *dev;
1657 char *next;
1658 unsigned size, t;
1659 unsigned long flags;
1660 int i;
1661 u32 t1, t2;
1662 const char *s;
1663
1664 dev = dev_get_drvdata(_dev);
1665 next = buf;
1666 size = PAGE_SIZE;
1667 spin_lock_irqsave(&dev->lock, flags);
1668
1669 if (dev->driver)
1670 s = dev->driver->driver.name;
1671 else
1672 s = "(none)";
1673
1674 /* Main Control Registers */
1675 t = scnprintf(next, size, "%s version " DRIVER_VERSION
1676 ", chiprev %04x\n\n"
1677 "devinit %03x fifoctl %08x gadget '%s'\n"
1678 "pci irqenb0 %02x irqenb1 %08x "
1679 "irqstat0 %04x irqstat1 %08x\n",
1680 driver_name, dev->chiprev,
1681 readl(&dev->regs->devinit),
1682 readl(&dev->regs->fifoctl),
1683 s,
1684 readl(&dev->regs->pciirqenb0),
1685 readl(&dev->regs->pciirqenb1),
1686 readl(&dev->regs->irqstat0),
1687 readl(&dev->regs->irqstat1));
1688 size -= t;
1689 next += t;
1690
1691 /* USB Control Registers */
1692 t1 = readl(&dev->usb->usbctl);
1693 t2 = readl(&dev->usb->usbstat);
1694 if (t1 & BIT(VBUS_PIN)) {
1695 if (t2 & BIT(HIGH_SPEED))
1696 s = "high speed";
1697 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1698 s = "powered";
1699 else
1700 s = "full speed";
1701 /* full speed bit (6) not working?? */
1702 } else
1703 s = "not attached";
1704 t = scnprintf(next, size,
1705 "stdrsp %08x usbctl %08x usbstat %08x "
1706 "addr 0x%02x (%s)\n",
1707 readl(&dev->usb->stdrsp), t1, t2,
1708 readl(&dev->usb->ouraddr), s);
1709 size -= t;
1710 next += t;
1711
1712 /* PCI Master Control Registers */
1713
1714 /* DMA Control Registers */
1715
1716 /* Configurable EP Control Registers */
1717 for (i = 0; i < dev->n_ep; i++) {
1718 struct net2280_ep *ep;
1719
1720 ep = &dev->ep[i];
1721 if (i && !ep->desc)
1722 continue;
1723
1724 t1 = readl(&ep->cfg->ep_cfg);
1725 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1726 t = scnprintf(next, size,
1727 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1728 "irqenb %02x\n",
1729 ep->ep.name, t1, t2,
1730 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1731 ? "NAK " : "",
1732 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1733 ? "hide " : "",
1734 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1735 ? "CRC " : "",
1736 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1737 ? "interrupt " : "",
1738 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1739 ? "status " : "",
1740 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1741 ? "NAKmode " : "",
1742 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1743 ? "DATA1 " : "DATA0 ",
1744 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1745 ? "HALT " : "",
1746 readl(&ep->regs->ep_irqenb));
1747 size -= t;
1748 next += t;
1749
1750 t = scnprintf(next, size,
1751 "\tstat %08x avail %04x "
1752 "(ep%d%s-%s)%s\n",
1753 readl(&ep->regs->ep_stat),
1754 readl(&ep->regs->ep_avail),
1755 t1 & 0x0f, DIR_STRING(t1),
1756 type_string(t1 >> 8),
1757 ep->stopped ? "*" : "");
1758 size -= t;
1759 next += t;
1760
1761 if (!ep->dma)
1762 continue;
1763
1764 t = scnprintf(next, size,
1765 " dma\tctl %08x stat %08x count %08x\n"
1766 "\taddr %08x desc %08x\n",
1767 readl(&ep->dma->dmactl),
1768 readl(&ep->dma->dmastat),
1769 readl(&ep->dma->dmacount),
1770 readl(&ep->dma->dmaaddr),
1771 readl(&ep->dma->dmadesc));
1772 size -= t;
1773 next += t;
1774
1775 }
1776
1777 /* Indexed Registers (none yet) */
1778
1779 /* Statistics */
1780 t = scnprintf(next, size, "\nirqs: ");
1781 size -= t;
1782 next += t;
1783 for (i = 0; i < dev->n_ep; i++) {
1784 struct net2280_ep *ep;
1785
1786 ep = &dev->ep[i];
1787 if (i && !ep->irqs)
1788 continue;
1789 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1790 size -= t;
1791 next += t;
1792
1793 }
1794 t = scnprintf(next, size, "\n");
1795 size -= t;
1796 next += t;
1797
1798 spin_unlock_irqrestore(&dev->lock, flags);
1799
1800 return PAGE_SIZE - size;
1801 }
1802 static DEVICE_ATTR_RO(registers);
1803
queues_show(struct device * _dev,struct device_attribute * attr,char * buf)1804 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1805 char *buf)
1806 {
1807 struct net2280 *dev;
1808 char *next;
1809 unsigned size;
1810 unsigned long flags;
1811 int i;
1812
1813 dev = dev_get_drvdata(_dev);
1814 next = buf;
1815 size = PAGE_SIZE;
1816 spin_lock_irqsave(&dev->lock, flags);
1817
1818 for (i = 0; i < dev->n_ep; i++) {
1819 struct net2280_ep *ep = &dev->ep[i];
1820 struct net2280_request *req;
1821 int t;
1822
1823 if (i != 0) {
1824 const struct usb_endpoint_descriptor *d;
1825
1826 d = ep->desc;
1827 if (!d)
1828 continue;
1829 t = d->bEndpointAddress;
1830 t = scnprintf(next, size,
1831 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1832 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1833 (t & USB_DIR_IN) ? "in" : "out",
1834 type_string(d->bmAttributes),
1835 usb_endpoint_maxp(d),
1836 ep->dma ? "dma" : "pio", ep->fifo_size
1837 );
1838 } else /* ep0 should only have one transfer queued */
1839 t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1840 ep->is_in ? "in" : "out");
1841 if (t <= 0 || t > size)
1842 goto done;
1843 size -= t;
1844 next += t;
1845
1846 if (list_empty(&ep->queue)) {
1847 t = scnprintf(next, size, "\t(nothing queued)\n");
1848 if (t <= 0 || t > size)
1849 goto done;
1850 size -= t;
1851 next += t;
1852 continue;
1853 }
1854 list_for_each_entry(req, &ep->queue, queue) {
1855 if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1856 t = scnprintf(next, size,
1857 "\treq %p len %d/%d "
1858 "buf %p (dmacount %08x)\n",
1859 &req->req, req->req.actual,
1860 req->req.length, req->req.buf,
1861 readl(&ep->dma->dmacount));
1862 else
1863 t = scnprintf(next, size,
1864 "\treq %p len %d/%d buf %p\n",
1865 &req->req, req->req.actual,
1866 req->req.length, req->req.buf);
1867 if (t <= 0 || t > size)
1868 goto done;
1869 size -= t;
1870 next += t;
1871
1872 if (ep->dma) {
1873 struct net2280_dma *td;
1874
1875 td = req->td;
1876 t = scnprintf(next, size, "\t td %08x "
1877 " count %08x buf %08x desc %08x\n",
1878 (u32) req->td_dma,
1879 le32_to_cpu(td->dmacount),
1880 le32_to_cpu(td->dmaaddr),
1881 le32_to_cpu(td->dmadesc));
1882 if (t <= 0 || t > size)
1883 goto done;
1884 size -= t;
1885 next += t;
1886 }
1887 }
1888 }
1889
1890 done:
1891 spin_unlock_irqrestore(&dev->lock, flags);
1892 return PAGE_SIZE - size;
1893 }
1894 static DEVICE_ATTR_RO(queues);
1895
1896
1897 #else
1898
1899 #define device_create_file(a, b) (0)
1900 #define device_remove_file(a, b) do { } while (0)
1901
1902 #endif
1903
1904 /*-------------------------------------------------------------------------*/
1905
1906 /* another driver-specific mode might be a request type doing dma
1907 * to/from another device fifo instead of to/from memory.
1908 */
1909
set_fifo_mode(struct net2280 * dev,int mode)1910 static void set_fifo_mode(struct net2280 *dev, int mode)
1911 {
1912 /* keeping high bits preserves BAR2 */
1913 writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1914
1915 /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1916 INIT_LIST_HEAD(&dev->gadget.ep_list);
1917 list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1918 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1919 switch (mode) {
1920 case 0:
1921 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1922 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1923 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1924 break;
1925 case 1:
1926 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1927 break;
1928 case 2:
1929 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1930 dev->ep[1].fifo_size = 2048;
1931 dev->ep[2].fifo_size = 1024;
1932 break;
1933 }
1934 /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1935 list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1936 list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1937 }
1938
defect7374_disable_data_eps(struct net2280 * dev)1939 static void defect7374_disable_data_eps(struct net2280 *dev)
1940 {
1941 /*
1942 * For Defect 7374, disable data EPs (and more):
1943 * - This phase undoes the earlier phase of the Defect 7374 workaround,
1944 * returing ep regs back to normal.
1945 */
1946 struct net2280_ep *ep;
1947 int i;
1948 unsigned char ep_sel;
1949 u32 tmp_reg;
1950
1951 for (i = 1; i < 5; i++) {
1952 ep = &dev->ep[i];
1953 writel(i, &ep->cfg->ep_cfg);
1954 }
1955
1956 /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1957 for (i = 0; i < 6; i++)
1958 writel(0, &dev->dep[i].dep_cfg);
1959
1960 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1961 /* Select an endpoint for subsequent operations: */
1962 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1963 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1964
1965 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1966 ep_sel == 18 || ep_sel == 20)
1967 continue;
1968
1969 /* Change settings on some selected endpoints */
1970 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1971 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1972 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1973 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1974 tmp_reg |= BIT(EP_INITIALIZED);
1975 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1976 }
1977 }
1978
defect7374_enable_data_eps_zero(struct net2280 * dev)1979 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1980 {
1981 u32 tmp = 0, tmp_reg;
1982 u32 scratch;
1983 int i;
1984 unsigned char ep_sel;
1985
1986 scratch = get_idx_reg(dev->regs, SCRATCH);
1987
1988 WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1989 == DEFECT7374_FSM_SS_CONTROL_READ);
1990
1991 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1992
1993 ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1994 ep_warn(dev, "It will operate on cold-reboot and SS connect");
1995
1996 /*GPEPs:*/
1997 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
1998 (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
1999 ((dev->enhanced_mode) ?
2000 BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
2001 BIT(ENDPOINT_ENABLE)));
2002
2003 for (i = 1; i < 5; i++)
2004 writel(tmp, &dev->ep[i].cfg->ep_cfg);
2005
2006 /* CSRIN, PCIIN, STATIN, RCIN*/
2007 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2008 writel(tmp, &dev->dep[1].dep_cfg);
2009 writel(tmp, &dev->dep[3].dep_cfg);
2010 writel(tmp, &dev->dep[4].dep_cfg);
2011 writel(tmp, &dev->dep[5].dep_cfg);
2012
2013 /*Implemented for development and debug.
2014 * Can be refined/tuned later.*/
2015 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2016 /* Select an endpoint for subsequent operations: */
2017 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2018 writel(((tmp_reg & ~0x1f) | ep_sel),
2019 &dev->plregs->pl_ep_ctrl);
2020
2021 if (ep_sel == 1) {
2022 tmp =
2023 (readl(&dev->plregs->pl_ep_ctrl) |
2024 BIT(CLEAR_ACK_ERROR_CODE) | 0);
2025 writel(tmp, &dev->plregs->pl_ep_ctrl);
2026 continue;
2027 }
2028
2029 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2030 ep_sel == 18 || ep_sel == 20)
2031 continue;
2032
2033 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2034 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2035 writel(tmp, &dev->plregs->pl_ep_cfg_4);
2036
2037 tmp = readl(&dev->plregs->pl_ep_ctrl) &
2038 ~BIT(EP_INITIALIZED);
2039 writel(tmp, &dev->plregs->pl_ep_ctrl);
2040
2041 }
2042
2043 /* Set FSM to focus on the first Control Read:
2044 * - Tip: Connection speed is known upon the first
2045 * setup request.*/
2046 scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2047 set_idx_reg(dev->regs, SCRATCH, scratch);
2048
2049 }
2050
2051 /* keeping it simple:
2052 * - one bus driver, initted first;
2053 * - one function driver, initted second
2054 *
2055 * most of the work to support multiple net2280 controllers would
2056 * be to associate this gadget driver (yes?) with all of them, or
2057 * perhaps to bind specific drivers to specific devices.
2058 */
2059
usb_reset_228x(struct net2280 * dev)2060 static void usb_reset_228x(struct net2280 *dev)
2061 {
2062 u32 tmp;
2063
2064 dev->gadget.speed = USB_SPEED_UNKNOWN;
2065 (void) readl(&dev->usb->usbctl);
2066
2067 net2280_led_init(dev);
2068
2069 /* disable automatic responses, and irqs */
2070 writel(0, &dev->usb->stdrsp);
2071 writel(0, &dev->regs->pciirqenb0);
2072 writel(0, &dev->regs->pciirqenb1);
2073
2074 /* clear old dma and irq state */
2075 for (tmp = 0; tmp < 4; tmp++) {
2076 struct net2280_ep *ep = &dev->ep[tmp + 1];
2077 if (ep->dma)
2078 abort_dma(ep);
2079 }
2080
2081 writel(~0, &dev->regs->irqstat0),
2082 writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2083
2084 /* reset, and enable pci */
2085 tmp = readl(&dev->regs->devinit) |
2086 BIT(PCI_ENABLE) |
2087 BIT(FIFO_SOFT_RESET) |
2088 BIT(USB_SOFT_RESET) |
2089 BIT(M8051_RESET);
2090 writel(tmp, &dev->regs->devinit);
2091
2092 /* standard fifo and endpoint allocations */
2093 set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2094 }
2095
usb_reset_338x(struct net2280 * dev)2096 static void usb_reset_338x(struct net2280 *dev)
2097 {
2098 u32 tmp;
2099
2100 dev->gadget.speed = USB_SPEED_UNKNOWN;
2101 (void)readl(&dev->usb->usbctl);
2102
2103 net2280_led_init(dev);
2104
2105 if (dev->bug7734_patched) {
2106 /* disable automatic responses, and irqs */
2107 writel(0, &dev->usb->stdrsp);
2108 writel(0, &dev->regs->pciirqenb0);
2109 writel(0, &dev->regs->pciirqenb1);
2110 }
2111
2112 /* clear old dma and irq state */
2113 for (tmp = 0; tmp < 4; tmp++) {
2114 struct net2280_ep *ep = &dev->ep[tmp + 1];
2115 struct net2280_dma_regs __iomem *dma;
2116
2117 if (ep->dma) {
2118 abort_dma(ep);
2119 } else {
2120 dma = &dev->dma[tmp];
2121 writel(BIT(DMA_ABORT), &dma->dmastat);
2122 writel(0, &dma->dmactl);
2123 }
2124 }
2125
2126 writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2127
2128 if (dev->bug7734_patched) {
2129 /* reset, and enable pci */
2130 tmp = readl(&dev->regs->devinit) |
2131 BIT(PCI_ENABLE) |
2132 BIT(FIFO_SOFT_RESET) |
2133 BIT(USB_SOFT_RESET) |
2134 BIT(M8051_RESET);
2135
2136 writel(tmp, &dev->regs->devinit);
2137 }
2138
2139 /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2140 INIT_LIST_HEAD(&dev->gadget.ep_list);
2141
2142 for (tmp = 1; tmp < dev->n_ep; tmp++)
2143 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2144
2145 }
2146
usb_reset(struct net2280 * dev)2147 static void usb_reset(struct net2280 *dev)
2148 {
2149 if (dev->quirks & PLX_LEGACY)
2150 return usb_reset_228x(dev);
2151 return usb_reset_338x(dev);
2152 }
2153
usb_reinit_228x(struct net2280 * dev)2154 static void usb_reinit_228x(struct net2280 *dev)
2155 {
2156 u32 tmp;
2157
2158 /* basic endpoint init */
2159 for (tmp = 0; tmp < 7; tmp++) {
2160 struct net2280_ep *ep = &dev->ep[tmp];
2161
2162 ep->ep.name = ep_info_dft[tmp].name;
2163 ep->ep.caps = ep_info_dft[tmp].caps;
2164 ep->dev = dev;
2165 ep->num = tmp;
2166
2167 if (tmp > 0 && tmp <= 4) {
2168 ep->fifo_size = 1024;
2169 ep->dma = &dev->dma[tmp - 1];
2170 } else
2171 ep->fifo_size = 64;
2172 ep->regs = &dev->epregs[tmp];
2173 ep->cfg = &dev->epregs[tmp];
2174 ep_reset_228x(dev->regs, ep);
2175 }
2176 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2177 usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2178 usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2179
2180 dev->gadget.ep0 = &dev->ep[0].ep;
2181 dev->ep[0].stopped = 0;
2182 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2183
2184 /* we want to prevent lowlevel/insecure access from the USB host,
2185 * but erratum 0119 means this enable bit is ignored
2186 */
2187 for (tmp = 0; tmp < 5; tmp++)
2188 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2189 }
2190
usb_reinit_338x(struct net2280 * dev)2191 static void usb_reinit_338x(struct net2280 *dev)
2192 {
2193 int i;
2194 u32 tmp, val;
2195 static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2196 static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2197 0x00, 0xC0, 0x00, 0xC0 };
2198
2199 /* basic endpoint init */
2200 for (i = 0; i < dev->n_ep; i++) {
2201 struct net2280_ep *ep = &dev->ep[i];
2202
2203 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2204 ep_info_dft[i].name;
2205 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2206 ep_info_dft[i].caps;
2207 ep->dev = dev;
2208 ep->num = i;
2209
2210 if (i > 0 && i <= 4)
2211 ep->dma = &dev->dma[i - 1];
2212
2213 if (dev->enhanced_mode) {
2214 ep->cfg = &dev->epregs[ne[i]];
2215 /*
2216 * Set USB endpoint number, hardware allows same number
2217 * in both directions.
2218 */
2219 if (i > 0 && i < 5)
2220 writel(ne[i], &ep->cfg->ep_cfg);
2221 ep->regs = (struct net2280_ep_regs __iomem *)
2222 (((void __iomem *)&dev->epregs[ne[i]]) +
2223 ep_reg_addr[i]);
2224 } else {
2225 ep->cfg = &dev->epregs[i];
2226 ep->regs = &dev->epregs[i];
2227 }
2228
2229 ep->fifo_size = (i != 0) ? 2048 : 512;
2230
2231 ep_reset_338x(dev->regs, ep);
2232 }
2233 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2234
2235 dev->gadget.ep0 = &dev->ep[0].ep;
2236 dev->ep[0].stopped = 0;
2237
2238 /* Link layer set up */
2239 if (dev->bug7734_patched) {
2240 tmp = readl(&dev->usb_ext->usbctl2) &
2241 ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2242 writel(tmp, &dev->usb_ext->usbctl2);
2243 }
2244
2245 /* Hardware Defect and Workaround */
2246 val = readl(&dev->llregs->ll_lfps_5);
2247 val &= ~(0xf << TIMER_LFPS_6US);
2248 val |= 0x5 << TIMER_LFPS_6US;
2249 writel(val, &dev->llregs->ll_lfps_5);
2250
2251 val = readl(&dev->llregs->ll_lfps_6);
2252 val &= ~(0xffff << TIMER_LFPS_80US);
2253 val |= 0x0100 << TIMER_LFPS_80US;
2254 writel(val, &dev->llregs->ll_lfps_6);
2255
2256 /*
2257 * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2258 * Hot Reset Exit Handshake may Fail in Specific Case using
2259 * Default Register Settings. Workaround for Enumeration test.
2260 */
2261 val = readl(&dev->llregs->ll_tsn_counters_2);
2262 val &= ~(0x1f << HOT_TX_NORESET_TS2);
2263 val |= 0x10 << HOT_TX_NORESET_TS2;
2264 writel(val, &dev->llregs->ll_tsn_counters_2);
2265
2266 val = readl(&dev->llregs->ll_tsn_counters_3);
2267 val &= ~(0x1f << HOT_RX_RESET_TS2);
2268 val |= 0x3 << HOT_RX_RESET_TS2;
2269 writel(val, &dev->llregs->ll_tsn_counters_3);
2270
2271 /*
2272 * AB errata. Errata 11. Workaround for Default Duration of LFPS
2273 * Handshake Signaling for Device-Initiated U1 Exit is too short.
2274 * Without this, various enumeration failures observed with
2275 * modern superspeed hosts.
2276 */
2277 val = readl(&dev->llregs->ll_lfps_timers_2);
2278 writel((val & 0xffff0000) | LFPS_TIMERS_2_WORKAROUND_VALUE,
2279 &dev->llregs->ll_lfps_timers_2);
2280
2281 /*
2282 * Set Recovery Idle to Recover bit:
2283 * - On SS connections, setting Recovery Idle to Recover Fmw improves
2284 * link robustness with various hosts and hubs.
2285 * - It is safe to set for all connection speeds; all chip revisions.
2286 * - R-M-W to leave other bits undisturbed.
2287 * - Reference PLX TT-7372
2288 */
2289 val = readl(&dev->llregs->ll_tsn_chicken_bit);
2290 val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2291 writel(val, &dev->llregs->ll_tsn_chicken_bit);
2292
2293 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2294
2295 /* disable dedicated endpoints */
2296 writel(0x0D, &dev->dep[0].dep_cfg);
2297 writel(0x0D, &dev->dep[1].dep_cfg);
2298 writel(0x0E, &dev->dep[2].dep_cfg);
2299 writel(0x0E, &dev->dep[3].dep_cfg);
2300 writel(0x0F, &dev->dep[4].dep_cfg);
2301 writel(0x0C, &dev->dep[5].dep_cfg);
2302 }
2303
usb_reinit(struct net2280 * dev)2304 static void usb_reinit(struct net2280 *dev)
2305 {
2306 if (dev->quirks & PLX_LEGACY)
2307 return usb_reinit_228x(dev);
2308 return usb_reinit_338x(dev);
2309 }
2310
ep0_start_228x(struct net2280 * dev)2311 static void ep0_start_228x(struct net2280 *dev)
2312 {
2313 writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2314 BIT(CLEAR_NAK_OUT_PACKETS) |
2315 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2316 &dev->epregs[0].ep_rsp);
2317
2318 /*
2319 * hardware optionally handles a bunch of standard requests
2320 * that the API hides from drivers anyway. have it do so.
2321 * endpoint status/features are handled in software, to
2322 * help pass tests for some dubious behavior.
2323 */
2324 writel(BIT(SET_TEST_MODE) |
2325 BIT(SET_ADDRESS) |
2326 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2327 BIT(GET_DEVICE_STATUS) |
2328 BIT(GET_INTERFACE_STATUS),
2329 &dev->usb->stdrsp);
2330 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2331 BIT(SELF_POWERED_USB_DEVICE) |
2332 BIT(REMOTE_WAKEUP_SUPPORT) |
2333 (dev->softconnect << USB_DETECT_ENABLE) |
2334 BIT(SELF_POWERED_STATUS),
2335 &dev->usb->usbctl);
2336
2337 /* enable irqs so we can see ep0 and general operation */
2338 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2339 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2340 &dev->regs->pciirqenb0);
2341 writel(BIT(PCI_INTERRUPT_ENABLE) |
2342 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2343 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2344 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2345 BIT(VBUS_INTERRUPT_ENABLE) |
2346 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2347 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2348 &dev->regs->pciirqenb1);
2349
2350 /* don't leave any writes posted */
2351 (void) readl(&dev->usb->usbctl);
2352 }
2353
ep0_start_338x(struct net2280 * dev)2354 static void ep0_start_338x(struct net2280 *dev)
2355 {
2356
2357 if (dev->bug7734_patched)
2358 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2359 BIT(SET_EP_HIDE_STATUS_PHASE),
2360 &dev->epregs[0].ep_rsp);
2361
2362 /*
2363 * hardware optionally handles a bunch of standard requests
2364 * that the API hides from drivers anyway. have it do so.
2365 * endpoint status/features are handled in software, to
2366 * help pass tests for some dubious behavior.
2367 */
2368 writel(BIT(SET_ISOCHRONOUS_DELAY) |
2369 BIT(SET_SEL) |
2370 BIT(SET_TEST_MODE) |
2371 BIT(SET_ADDRESS) |
2372 BIT(GET_INTERFACE_STATUS) |
2373 BIT(GET_DEVICE_STATUS),
2374 &dev->usb->stdrsp);
2375 dev->wakeup_enable = 1;
2376 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2377 (dev->softconnect << USB_DETECT_ENABLE) |
2378 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2379 &dev->usb->usbctl);
2380
2381 /* enable irqs so we can see ep0 and general operation */
2382 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2383 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2384 &dev->regs->pciirqenb0);
2385 writel(BIT(PCI_INTERRUPT_ENABLE) |
2386 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2387 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2388 BIT(VBUS_INTERRUPT_ENABLE),
2389 &dev->regs->pciirqenb1);
2390
2391 /* don't leave any writes posted */
2392 (void)readl(&dev->usb->usbctl);
2393 }
2394
ep0_start(struct net2280 * dev)2395 static void ep0_start(struct net2280 *dev)
2396 {
2397 if (dev->quirks & PLX_LEGACY)
2398 return ep0_start_228x(dev);
2399 return ep0_start_338x(dev);
2400 }
2401
2402 /* when a driver is successfully registered, it will receive
2403 * control requests including set_configuration(), which enables
2404 * non-control requests. then usb traffic follows until a
2405 * disconnect is reported. then a host may connect again, or
2406 * the driver might get unbound.
2407 */
net2280_start(struct usb_gadget * _gadget,struct usb_gadget_driver * driver)2408 static int net2280_start(struct usb_gadget *_gadget,
2409 struct usb_gadget_driver *driver)
2410 {
2411 struct net2280 *dev;
2412 int retval;
2413 unsigned i;
2414
2415 /* insist on high speed support from the driver, since
2416 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2417 * "must not be used in normal operation"
2418 */
2419 if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2420 !driver->setup)
2421 return -EINVAL;
2422
2423 dev = container_of(_gadget, struct net2280, gadget);
2424
2425 for (i = 0; i < dev->n_ep; i++)
2426 dev->ep[i].irqs = 0;
2427
2428 /* hook up the driver ... */
2429 driver->driver.bus = NULL;
2430 dev->driver = driver;
2431
2432 retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2433 if (retval)
2434 goto err_unbind;
2435 retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2436 if (retval)
2437 goto err_func;
2438
2439 /* enable host detection and ep0; and we're ready
2440 * for set_configuration as well as eventual disconnect.
2441 */
2442 net2280_led_active(dev, 1);
2443
2444 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2445 defect7374_enable_data_eps_zero(dev);
2446
2447 ep0_start(dev);
2448
2449 /* pci writes may still be posted */
2450 return 0;
2451
2452 err_func:
2453 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2454 err_unbind:
2455 dev->driver = NULL;
2456 return retval;
2457 }
2458
stop_activity(struct net2280 * dev,struct usb_gadget_driver * driver)2459 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2460 {
2461 int i;
2462
2463 /* don't disconnect if it's not connected */
2464 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2465 driver = NULL;
2466
2467 /* stop hardware; prevent new request submissions;
2468 * and kill any outstanding requests.
2469 */
2470 usb_reset(dev);
2471 for (i = 0; i < dev->n_ep; i++)
2472 nuke(&dev->ep[i]);
2473
2474 /* report disconnect; the driver is already quiesced */
2475 if (driver) {
2476 spin_unlock(&dev->lock);
2477 driver->disconnect(&dev->gadget);
2478 spin_lock(&dev->lock);
2479 }
2480
2481 usb_reinit(dev);
2482 }
2483
net2280_stop(struct usb_gadget * _gadget)2484 static int net2280_stop(struct usb_gadget *_gadget)
2485 {
2486 struct net2280 *dev;
2487 unsigned long flags;
2488
2489 dev = container_of(_gadget, struct net2280, gadget);
2490
2491 spin_lock_irqsave(&dev->lock, flags);
2492 stop_activity(dev, NULL);
2493 spin_unlock_irqrestore(&dev->lock, flags);
2494
2495 net2280_led_active(dev, 0);
2496
2497 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2498 device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2499
2500 dev->driver = NULL;
2501
2502 return 0;
2503 }
2504
2505 /*-------------------------------------------------------------------------*/
2506
2507 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2508 * also works for dma-capable endpoints, in pio mode or just
2509 * to manually advance the queue after short OUT transfers.
2510 */
handle_ep_small(struct net2280_ep * ep)2511 static void handle_ep_small(struct net2280_ep *ep)
2512 {
2513 struct net2280_request *req;
2514 u32 t;
2515 /* 0 error, 1 mid-data, 2 done */
2516 int mode = 1;
2517
2518 if (!list_empty(&ep->queue))
2519 req = list_entry(ep->queue.next,
2520 struct net2280_request, queue);
2521 else
2522 req = NULL;
2523
2524 /* ack all, and handle what we care about */
2525 t = readl(&ep->regs->ep_stat);
2526 ep->irqs++;
2527
2528 ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2529 ep->ep.name, t, req ? &req->req : NULL);
2530
2531 if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2532 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2533 else
2534 /* Added for 2282 */
2535 writel(t, &ep->regs->ep_stat);
2536
2537 /* for ep0, monitor token irqs to catch data stage length errors
2538 * and to synchronize on status.
2539 *
2540 * also, to defer reporting of protocol stalls ... here's where
2541 * data or status first appears, handling stalls here should never
2542 * cause trouble on the host side..
2543 *
2544 * control requests could be slightly faster without token synch for
2545 * status, but status can jam up that way.
2546 */
2547 if (unlikely(ep->num == 0)) {
2548 if (ep->is_in) {
2549 /* status; stop NAKing */
2550 if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2551 if (ep->dev->protocol_stall) {
2552 ep->stopped = 1;
2553 set_halt(ep);
2554 }
2555 if (!req)
2556 allow_status(ep);
2557 mode = 2;
2558 /* reply to extra IN data tokens with a zlp */
2559 } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2560 if (ep->dev->protocol_stall) {
2561 ep->stopped = 1;
2562 set_halt(ep);
2563 mode = 2;
2564 } else if (ep->responded &&
2565 !req && !ep->stopped)
2566 write_fifo(ep, NULL);
2567 }
2568 } else {
2569 /* status; stop NAKing */
2570 if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2571 if (ep->dev->protocol_stall) {
2572 ep->stopped = 1;
2573 set_halt(ep);
2574 }
2575 mode = 2;
2576 /* an extra OUT token is an error */
2577 } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2578 req &&
2579 req->req.actual == req->req.length) ||
2580 (ep->responded && !req)) {
2581 ep->dev->protocol_stall = 1;
2582 set_halt(ep);
2583 ep->stopped = 1;
2584 if (req)
2585 done(ep, req, -EOVERFLOW);
2586 req = NULL;
2587 }
2588 }
2589 }
2590
2591 if (unlikely(!req))
2592 return;
2593
2594 /* manual DMA queue advance after short OUT */
2595 if (likely(ep->dma)) {
2596 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2597 struct net2280_request *stuck_req = NULL;
2598 int stopped = ep->stopped;
2599 int num_completed;
2600 int stuck = 0;
2601 u32 count;
2602
2603 /* TRANSFERRED works around OUT_DONE erratum 0112.
2604 * we expect (N <= maxpacket) bytes; host wrote M.
2605 * iff (M < N) we won't ever see a DMA interrupt.
2606 */
2607 ep->stopped = 1;
2608 for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2609
2610 /* any preceding dma transfers must finish.
2611 * dma handles (M >= N), may empty the queue
2612 */
2613 num_completed = scan_dma_completions(ep);
2614 if (unlikely(list_empty(&ep->queue) ||
2615 ep->out_overflow)) {
2616 req = NULL;
2617 break;
2618 }
2619 req = list_entry(ep->queue.next,
2620 struct net2280_request, queue);
2621
2622 /* here either (M < N), a "real" short rx;
2623 * or (M == N) and the queue didn't empty
2624 */
2625 if (likely(t & BIT(FIFO_EMPTY))) {
2626 count = readl(&ep->dma->dmacount);
2627 count &= DMA_BYTE_COUNT_MASK;
2628 if (readl(&ep->dma->dmadesc)
2629 != req->td_dma)
2630 req = NULL;
2631 break;
2632 }
2633
2634 /* Escape loop if no dma transfers completed
2635 * after few retries.
2636 */
2637 if (num_completed == 0) {
2638 if (stuck_req == req &&
2639 readl(&ep->dma->dmadesc) !=
2640 req->td_dma && stuck++ > 5) {
2641 count = readl(
2642 &ep->dma->dmacount);
2643 count &= DMA_BYTE_COUNT_MASK;
2644 req = NULL;
2645 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2646 ep->ep.name, stuck,
2647 count);
2648 break;
2649 } else if (stuck_req != req) {
2650 stuck_req = req;
2651 stuck = 0;
2652 }
2653 } else {
2654 stuck_req = NULL;
2655 stuck = 0;
2656 }
2657
2658 udelay(1);
2659 }
2660
2661 /* stop DMA, leave ep NAKing */
2662 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2663 spin_stop_dma(ep->dma);
2664
2665 if (likely(req)) {
2666 req->td->dmacount = 0;
2667 t = readl(&ep->regs->ep_avail);
2668 dma_done(ep, req, count,
2669 (ep->out_overflow || t)
2670 ? -EOVERFLOW : 0);
2671 }
2672
2673 /* also flush to prevent erratum 0106 trouble */
2674 if (unlikely(ep->out_overflow ||
2675 (ep->dev->chiprev == 0x0100 &&
2676 ep->dev->gadget.speed
2677 == USB_SPEED_FULL))) {
2678 out_flush(ep);
2679 ep->out_overflow = 0;
2680 }
2681
2682 /* (re)start dma if needed, stop NAKing */
2683 ep->stopped = stopped;
2684 if (!list_empty(&ep->queue))
2685 restart_dma(ep);
2686 } else
2687 ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2688 ep->ep.name, t);
2689 return;
2690
2691 /* data packet(s) received (in the fifo, OUT) */
2692 } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2693 if (read_fifo(ep, req) && ep->num != 0)
2694 mode = 2;
2695
2696 /* data packet(s) transmitted (IN) */
2697 } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2698 unsigned len;
2699
2700 len = req->req.length - req->req.actual;
2701 if (len > ep->ep.maxpacket)
2702 len = ep->ep.maxpacket;
2703 req->req.actual += len;
2704
2705 /* if we wrote it all, we're usually done */
2706 /* send zlps until the status stage */
2707 if ((req->req.actual == req->req.length) &&
2708 (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2709 mode = 2;
2710
2711 /* there was nothing to do ... */
2712 } else if (mode == 1)
2713 return;
2714
2715 /* done */
2716 if (mode == 2) {
2717 /* stream endpoints often resubmit/unlink in completion */
2718 done(ep, req, 0);
2719
2720 /* maybe advance queue to next request */
2721 if (ep->num == 0) {
2722 /* NOTE: net2280 could let gadget driver start the
2723 * status stage later. since not all controllers let
2724 * them control that, the api doesn't (yet) allow it.
2725 */
2726 if (!ep->stopped)
2727 allow_status(ep);
2728 req = NULL;
2729 } else {
2730 if (!list_empty(&ep->queue) && !ep->stopped)
2731 req = list_entry(ep->queue.next,
2732 struct net2280_request, queue);
2733 else
2734 req = NULL;
2735 if (req && !ep->is_in)
2736 stop_out_naking(ep);
2737 }
2738 }
2739
2740 /* is there a buffer for the next packet?
2741 * for best streaming performance, make sure there is one.
2742 */
2743 if (req && !ep->stopped) {
2744
2745 /* load IN fifo with next packet (may be zlp) */
2746 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2747 write_fifo(ep, &req->req);
2748 }
2749 }
2750
get_ep_by_addr(struct net2280 * dev,u16 wIndex)2751 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2752 {
2753 struct net2280_ep *ep;
2754
2755 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2756 return &dev->ep[0];
2757 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2758 u8 bEndpointAddress;
2759
2760 if (!ep->desc)
2761 continue;
2762 bEndpointAddress = ep->desc->bEndpointAddress;
2763 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2764 continue;
2765 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2766 return ep;
2767 }
2768 return NULL;
2769 }
2770
defect7374_workaround(struct net2280 * dev,struct usb_ctrlrequest r)2771 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2772 {
2773 u32 scratch, fsmvalue;
2774 u32 ack_wait_timeout, state;
2775
2776 /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2777 scratch = get_idx_reg(dev->regs, SCRATCH);
2778 fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2779 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2780
2781 if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2782 (r.bRequestType & USB_DIR_IN)))
2783 return;
2784
2785 /* This is the first Control Read for this connection: */
2786 if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2787 /*
2788 * Connection is NOT SS:
2789 * - Connection must be FS or HS.
2790 * - This FSM state should allow workaround software to
2791 * run after the next USB connection.
2792 */
2793 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2794 dev->bug7734_patched = 1;
2795 goto restore_data_eps;
2796 }
2797
2798 /* Connection is SS: */
2799 for (ack_wait_timeout = 0;
2800 ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2801 ack_wait_timeout++) {
2802
2803 state = readl(&dev->plregs->pl_ep_status_1)
2804 & (0xff << STATE);
2805 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2806 (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2807 scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2808 dev->bug7734_patched = 1;
2809 break;
2810 }
2811
2812 /*
2813 * We have not yet received host's Data Phase ACK
2814 * - Wait and try again.
2815 */
2816 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2817
2818 continue;
2819 }
2820
2821
2822 if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2823 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2824 "to detect SS host's data phase ACK.");
2825 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2826 "got 0x%2.2x.\n", state >> STATE);
2827 } else {
2828 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2829 "%duSec for Control Read Data Phase ACK\n",
2830 DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2831 }
2832
2833 restore_data_eps:
2834 /*
2835 * Restore data EPs to their pre-workaround settings (disabled,
2836 * initialized, and other details).
2837 */
2838 defect7374_disable_data_eps(dev);
2839
2840 set_idx_reg(dev->regs, SCRATCH, scratch);
2841
2842 return;
2843 }
2844
ep_clear_seqnum(struct net2280_ep * ep)2845 static void ep_clear_seqnum(struct net2280_ep *ep)
2846 {
2847 struct net2280 *dev = ep->dev;
2848 u32 val;
2849 static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2850
2851 val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2852 val |= ep_pl[ep->num];
2853 writel(val, &dev->plregs->pl_ep_ctrl);
2854 val |= BIT(SEQUENCE_NUMBER_RESET);
2855 writel(val, &dev->plregs->pl_ep_ctrl);
2856
2857 return;
2858 }
2859
handle_stat0_irqs_superspeed(struct net2280 * dev,struct net2280_ep * ep,struct usb_ctrlrequest r)2860 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2861 struct net2280_ep *ep, struct usb_ctrlrequest r)
2862 {
2863 struct net2280_ep *e;
2864 u16 status;
2865 int tmp = 0;
2866
2867 #define w_value le16_to_cpu(r.wValue)
2868 #define w_index le16_to_cpu(r.wIndex)
2869 #define w_length le16_to_cpu(r.wLength)
2870
2871 switch (r.bRequest) {
2872 case USB_REQ_SET_CONFIGURATION:
2873 dev->addressed_state = !w_value;
2874 goto usb3_delegate;
2875
2876 case USB_REQ_GET_STATUS:
2877 switch (r.bRequestType) {
2878 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2879 status = dev->wakeup_enable ? 0x02 : 0x00;
2880 if (dev->gadget.is_selfpowered)
2881 status |= BIT(0);
2882 status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2883 dev->ltm_enable << 4);
2884 writel(0, &dev->epregs[0].ep_irqenb);
2885 set_fifo_bytecount(ep, sizeof(status));
2886 writel((__force u32) status, &dev->epregs[0].ep_data);
2887 allow_status_338x(ep);
2888 break;
2889
2890 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2891 e = get_ep_by_addr(dev, w_index);
2892 if (!e)
2893 goto do_stall3;
2894 status = readl(&e->regs->ep_rsp) &
2895 BIT(CLEAR_ENDPOINT_HALT);
2896 writel(0, &dev->epregs[0].ep_irqenb);
2897 set_fifo_bytecount(ep, sizeof(status));
2898 writel((__force u32) status, &dev->epregs[0].ep_data);
2899 allow_status_338x(ep);
2900 break;
2901
2902 default:
2903 goto usb3_delegate;
2904 }
2905 break;
2906
2907 case USB_REQ_CLEAR_FEATURE:
2908 switch (r.bRequestType) {
2909 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2910 if (!dev->addressed_state) {
2911 switch (w_value) {
2912 case USB_DEVICE_U1_ENABLE:
2913 dev->u1_enable = 0;
2914 writel(readl(&dev->usb_ext->usbctl2) &
2915 ~BIT(U1_ENABLE),
2916 &dev->usb_ext->usbctl2);
2917 allow_status_338x(ep);
2918 goto next_endpoints3;
2919
2920 case USB_DEVICE_U2_ENABLE:
2921 dev->u2_enable = 0;
2922 writel(readl(&dev->usb_ext->usbctl2) &
2923 ~BIT(U2_ENABLE),
2924 &dev->usb_ext->usbctl2);
2925 allow_status_338x(ep);
2926 goto next_endpoints3;
2927
2928 case USB_DEVICE_LTM_ENABLE:
2929 dev->ltm_enable = 0;
2930 writel(readl(&dev->usb_ext->usbctl2) &
2931 ~BIT(LTM_ENABLE),
2932 &dev->usb_ext->usbctl2);
2933 allow_status_338x(ep);
2934 goto next_endpoints3;
2935
2936 default:
2937 break;
2938 }
2939 }
2940 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2941 dev->wakeup_enable = 0;
2942 writel(readl(&dev->usb->usbctl) &
2943 ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2944 &dev->usb->usbctl);
2945 allow_status_338x(ep);
2946 break;
2947 }
2948 goto usb3_delegate;
2949
2950 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2951 e = get_ep_by_addr(dev, w_index);
2952 if (!e)
2953 goto do_stall3;
2954 if (w_value != USB_ENDPOINT_HALT)
2955 goto do_stall3;
2956 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2957 /*
2958 * Workaround for SS SeqNum not cleared via
2959 * Endpoint Halt (Clear) bit. select endpoint
2960 */
2961 ep_clear_seqnum(e);
2962 clear_halt(e);
2963 if (!list_empty(&e->queue) && e->td_dma)
2964 restart_dma(e);
2965 allow_status(ep);
2966 ep->stopped = 1;
2967 break;
2968
2969 default:
2970 goto usb3_delegate;
2971 }
2972 break;
2973 case USB_REQ_SET_FEATURE:
2974 switch (r.bRequestType) {
2975 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2976 if (!dev->addressed_state) {
2977 switch (w_value) {
2978 case USB_DEVICE_U1_ENABLE:
2979 dev->u1_enable = 1;
2980 writel(readl(&dev->usb_ext->usbctl2) |
2981 BIT(U1_ENABLE),
2982 &dev->usb_ext->usbctl2);
2983 allow_status_338x(ep);
2984 goto next_endpoints3;
2985
2986 case USB_DEVICE_U2_ENABLE:
2987 dev->u2_enable = 1;
2988 writel(readl(&dev->usb_ext->usbctl2) |
2989 BIT(U2_ENABLE),
2990 &dev->usb_ext->usbctl2);
2991 allow_status_338x(ep);
2992 goto next_endpoints3;
2993
2994 case USB_DEVICE_LTM_ENABLE:
2995 dev->ltm_enable = 1;
2996 writel(readl(&dev->usb_ext->usbctl2) |
2997 BIT(LTM_ENABLE),
2998 &dev->usb_ext->usbctl2);
2999 allow_status_338x(ep);
3000 goto next_endpoints3;
3001 default:
3002 break;
3003 }
3004 }
3005
3006 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
3007 dev->wakeup_enable = 1;
3008 writel(readl(&dev->usb->usbctl) |
3009 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
3010 &dev->usb->usbctl);
3011 allow_status_338x(ep);
3012 break;
3013 }
3014 goto usb3_delegate;
3015
3016 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
3017 e = get_ep_by_addr(dev, w_index);
3018 if (!e || (w_value != USB_ENDPOINT_HALT))
3019 goto do_stall3;
3020 ep->stopped = 1;
3021 if (ep->num == 0)
3022 ep->dev->protocol_stall = 1;
3023 else {
3024 if (ep->dma)
3025 abort_dma(ep);
3026 set_halt(ep);
3027 }
3028 allow_status_338x(ep);
3029 break;
3030
3031 default:
3032 goto usb3_delegate;
3033 }
3034
3035 break;
3036 default:
3037
3038 usb3_delegate:
3039 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
3040 r.bRequestType, r.bRequest,
3041 w_value, w_index, w_length,
3042 readl(&ep->cfg->ep_cfg));
3043
3044 ep->responded = 0;
3045 spin_unlock(&dev->lock);
3046 tmp = dev->driver->setup(&dev->gadget, &r);
3047 spin_lock(&dev->lock);
3048 }
3049 do_stall3:
3050 if (tmp < 0) {
3051 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3052 r.bRequestType, r.bRequest, tmp);
3053 dev->protocol_stall = 1;
3054 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
3055 set_halt(ep);
3056 }
3057
3058 next_endpoints3:
3059
3060 #undef w_value
3061 #undef w_index
3062 #undef w_length
3063
3064 return;
3065 }
3066
usb338x_handle_ep_intr(struct net2280 * dev,u32 stat0)3067 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
3068 {
3069 u32 index;
3070 u32 bit;
3071
3072 for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
3073 bit = BIT(ep_bit[index]);
3074
3075 if (!stat0)
3076 break;
3077
3078 if (!(stat0 & bit))
3079 continue;
3080
3081 stat0 &= ~bit;
3082
3083 handle_ep_small(&dev->ep[index]);
3084 }
3085 }
3086
handle_stat0_irqs(struct net2280 * dev,u32 stat)3087 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3088 {
3089 struct net2280_ep *ep;
3090 u32 num, scratch;
3091
3092 /* most of these don't need individual acks */
3093 stat &= ~BIT(INTA_ASSERTED);
3094 if (!stat)
3095 return;
3096 /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3097
3098 /* starting a control request? */
3099 if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3100 union {
3101 u32 raw[2];
3102 struct usb_ctrlrequest r;
3103 } u;
3104 int tmp;
3105 struct net2280_request *req;
3106
3107 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3108 u32 val = readl(&dev->usb->usbstat);
3109 if (val & BIT(SUPER_SPEED)) {
3110 dev->gadget.speed = USB_SPEED_SUPER;
3111 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3112 EP0_SS_MAX_PACKET_SIZE);
3113 } else if (val & BIT(HIGH_SPEED)) {
3114 dev->gadget.speed = USB_SPEED_HIGH;
3115 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3116 EP0_HS_MAX_PACKET_SIZE);
3117 } else {
3118 dev->gadget.speed = USB_SPEED_FULL;
3119 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3120 EP0_HS_MAX_PACKET_SIZE);
3121 }
3122 net2280_led_speed(dev, dev->gadget.speed);
3123 ep_dbg(dev, "%s\n",
3124 usb_speed_string(dev->gadget.speed));
3125 }
3126
3127 ep = &dev->ep[0];
3128 ep->irqs++;
3129
3130 /* make sure any leftover request state is cleared */
3131 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3132 while (!list_empty(&ep->queue)) {
3133 req = list_entry(ep->queue.next,
3134 struct net2280_request, queue);
3135 done(ep, req, (req->req.actual == req->req.length)
3136 ? 0 : -EPROTO);
3137 }
3138 ep->stopped = 0;
3139 dev->protocol_stall = 0;
3140 if (!(dev->quirks & PLX_PCIE)) {
3141 if (ep->dev->quirks & PLX_2280)
3142 tmp = BIT(FIFO_OVERFLOW) |
3143 BIT(FIFO_UNDERFLOW);
3144 else
3145 tmp = 0;
3146
3147 writel(tmp | BIT(TIMEOUT) |
3148 BIT(USB_STALL_SENT) |
3149 BIT(USB_IN_NAK_SENT) |
3150 BIT(USB_IN_ACK_RCVD) |
3151 BIT(USB_OUT_PING_NAK_SENT) |
3152 BIT(USB_OUT_ACK_SENT) |
3153 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3154 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3155 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3156 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3157 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3158 BIT(DATA_IN_TOKEN_INTERRUPT),
3159 &ep->regs->ep_stat);
3160 }
3161 u.raw[0] = readl(&dev->usb->setup0123);
3162 u.raw[1] = readl(&dev->usb->setup4567);
3163
3164 cpu_to_le32s(&u.raw[0]);
3165 cpu_to_le32s(&u.raw[1]);
3166
3167 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
3168 defect7374_workaround(dev, u.r);
3169
3170 tmp = 0;
3171
3172 #define w_value le16_to_cpu(u.r.wValue)
3173 #define w_index le16_to_cpu(u.r.wIndex)
3174 #define w_length le16_to_cpu(u.r.wLength)
3175
3176 /* ack the irq */
3177 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3178 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3179
3180 /* watch control traffic at the token level, and force
3181 * synchronization before letting the status stage happen.
3182 * FIXME ignore tokens we'll NAK, until driver responds.
3183 * that'll mean a lot less irqs for some drivers.
3184 */
3185 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3186 if (ep->is_in) {
3187 scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3188 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3189 BIT(DATA_IN_TOKEN_INTERRUPT);
3190 stop_out_naking(ep);
3191 } else
3192 scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3193 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3194 BIT(DATA_IN_TOKEN_INTERRUPT);
3195 writel(scratch, &dev->epregs[0].ep_irqenb);
3196
3197 /* we made the hardware handle most lowlevel requests;
3198 * everything else goes uplevel to the gadget code.
3199 */
3200 ep->responded = 1;
3201
3202 if (dev->gadget.speed == USB_SPEED_SUPER) {
3203 handle_stat0_irqs_superspeed(dev, ep, u.r);
3204 goto next_endpoints;
3205 }
3206
3207 switch (u.r.bRequest) {
3208 case USB_REQ_GET_STATUS: {
3209 struct net2280_ep *e;
3210 __le32 status;
3211
3212 /* hw handles device and interface status */
3213 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3214 goto delegate;
3215 e = get_ep_by_addr(dev, w_index);
3216 if (!e || w_length > 2)
3217 goto do_stall;
3218
3219 if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3220 status = cpu_to_le32(1);
3221 else
3222 status = cpu_to_le32(0);
3223
3224 /* don't bother with a request object! */
3225 writel(0, &dev->epregs[0].ep_irqenb);
3226 set_fifo_bytecount(ep, w_length);
3227 writel((__force u32)status, &dev->epregs[0].ep_data);
3228 allow_status(ep);
3229 ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3230 goto next_endpoints;
3231 }
3232 break;
3233 case USB_REQ_CLEAR_FEATURE: {
3234 struct net2280_ep *e;
3235
3236 /* hw handles device features */
3237 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3238 goto delegate;
3239 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3240 goto do_stall;
3241 e = get_ep_by_addr(dev, w_index);
3242 if (!e)
3243 goto do_stall;
3244 if (e->wedged) {
3245 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3246 ep->ep.name);
3247 } else {
3248 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3249 clear_halt(e);
3250 if ((ep->dev->quirks & PLX_PCIE) &&
3251 !list_empty(&e->queue) && e->td_dma)
3252 restart_dma(e);
3253 }
3254 allow_status(ep);
3255 goto next_endpoints;
3256 }
3257 break;
3258 case USB_REQ_SET_FEATURE: {
3259 struct net2280_ep *e;
3260
3261 /* hw handles device features */
3262 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3263 goto delegate;
3264 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3265 goto do_stall;
3266 e = get_ep_by_addr(dev, w_index);
3267 if (!e)
3268 goto do_stall;
3269 if (e->ep.name == ep0name)
3270 goto do_stall;
3271 set_halt(e);
3272 if ((dev->quirks & PLX_PCIE) && e->dma)
3273 abort_dma(e);
3274 allow_status(ep);
3275 ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3276 goto next_endpoints;
3277 }
3278 break;
3279 default:
3280 delegate:
3281 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3282 "ep_cfg %08x\n",
3283 u.r.bRequestType, u.r.bRequest,
3284 w_value, w_index, w_length,
3285 readl(&ep->cfg->ep_cfg));
3286 ep->responded = 0;
3287 spin_unlock(&dev->lock);
3288 tmp = dev->driver->setup(&dev->gadget, &u.r);
3289 spin_lock(&dev->lock);
3290 }
3291
3292 /* stall ep0 on error */
3293 if (tmp < 0) {
3294 do_stall:
3295 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3296 u.r.bRequestType, u.r.bRequest, tmp);
3297 dev->protocol_stall = 1;
3298 }
3299
3300 /* some in/out token irq should follow; maybe stall then.
3301 * driver must queue a request (even zlp) or halt ep0
3302 * before the host times out.
3303 */
3304 }
3305
3306 #undef w_value
3307 #undef w_index
3308 #undef w_length
3309
3310 next_endpoints:
3311 if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
3312 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3313 USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3314 USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3315
3316 if (stat & mask) {
3317 usb338x_handle_ep_intr(dev, stat & mask);
3318 stat &= ~mask;
3319 }
3320 } else {
3321 /* endpoint data irq ? */
3322 scratch = stat & 0x7f;
3323 stat &= ~0x7f;
3324 for (num = 0; scratch; num++) {
3325 u32 t;
3326
3327 /* do this endpoint's FIFO and queue need tending? */
3328 t = BIT(num);
3329 if ((scratch & t) == 0)
3330 continue;
3331 scratch ^= t;
3332
3333 ep = &dev->ep[num];
3334 handle_ep_small(ep);
3335 }
3336 }
3337
3338 if (stat)
3339 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3340 }
3341
3342 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3343 BIT(DMA_C_INTERRUPT) | \
3344 BIT(DMA_B_INTERRUPT) | \
3345 BIT(DMA_A_INTERRUPT))
3346 #define PCI_ERROR_INTERRUPTS ( \
3347 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3348 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3349 BIT(PCI_RETRY_ABORT_INTERRUPT))
3350
handle_stat1_irqs(struct net2280 * dev,u32 stat)3351 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3352 __releases(dev->lock)
3353 __acquires(dev->lock)
3354 {
3355 struct net2280_ep *ep;
3356 u32 tmp, num, mask, scratch;
3357
3358 /* after disconnect there's nothing else to do! */
3359 tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3360 mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3361
3362 /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3363 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3364 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3365 * only indicates a change in the reset state).
3366 */
3367 if (stat & tmp) {
3368 bool reset = false;
3369 bool disconnect = false;
3370
3371 /*
3372 * Ignore disconnects and resets if the speed hasn't been set.
3373 * VBUS can bounce and there's always an initial reset.
3374 */
3375 writel(tmp, &dev->regs->irqstat1);
3376 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3377 if ((stat & BIT(VBUS_INTERRUPT)) &&
3378 (readl(&dev->usb->usbctl) &
3379 BIT(VBUS_PIN)) == 0) {
3380 disconnect = true;
3381 ep_dbg(dev, "disconnect %s\n",
3382 dev->driver->driver.name);
3383 } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3384 (readl(&dev->usb->usbstat) & mask)
3385 == 0) {
3386 reset = true;
3387 ep_dbg(dev, "reset %s\n",
3388 dev->driver->driver.name);
3389 }
3390
3391 if (disconnect || reset) {
3392 stop_activity(dev, dev->driver);
3393 ep0_start(dev);
3394 spin_unlock(&dev->lock);
3395 if (reset)
3396 usb_gadget_udc_reset
3397 (&dev->gadget, dev->driver);
3398 else
3399 (dev->driver->disconnect)
3400 (&dev->gadget);
3401 spin_lock(&dev->lock);
3402 return;
3403 }
3404 }
3405 stat &= ~tmp;
3406
3407 /* vBUS can bounce ... one of many reasons to ignore the
3408 * notion of hotplug events on bus connect/disconnect!
3409 */
3410 if (!stat)
3411 return;
3412 }
3413
3414 /* NOTE: chip stays in PCI D0 state for now, but it could
3415 * enter D1 to save more power
3416 */
3417 tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3418 if (stat & tmp) {
3419 writel(tmp, &dev->regs->irqstat1);
3420 spin_unlock(&dev->lock);
3421 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3422 if (dev->driver->suspend)
3423 dev->driver->suspend(&dev->gadget);
3424 if (!enable_suspend)
3425 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3426 } else {
3427 if (dev->driver->resume)
3428 dev->driver->resume(&dev->gadget);
3429 /* at high speed, note erratum 0133 */
3430 }
3431 spin_lock(&dev->lock);
3432 stat &= ~tmp;
3433 }
3434
3435 /* clear any other status/irqs */
3436 if (stat)
3437 writel(stat, &dev->regs->irqstat1);
3438
3439 /* some status we can just ignore */
3440 if (dev->quirks & PLX_2280)
3441 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3442 BIT(SUSPEND_REQUEST_INTERRUPT) |
3443 BIT(RESUME_INTERRUPT) |
3444 BIT(SOF_INTERRUPT));
3445 else
3446 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3447 BIT(RESUME_INTERRUPT) |
3448 BIT(SOF_DOWN_INTERRUPT) |
3449 BIT(SOF_INTERRUPT));
3450
3451 if (!stat)
3452 return;
3453 /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3454
3455 /* DMA status, for ep-{a,b,c,d} */
3456 scratch = stat & DMA_INTERRUPTS;
3457 stat &= ~DMA_INTERRUPTS;
3458 scratch >>= 9;
3459 for (num = 0; scratch; num++) {
3460 struct net2280_dma_regs __iomem *dma;
3461
3462 tmp = BIT(num);
3463 if ((tmp & scratch) == 0)
3464 continue;
3465 scratch ^= tmp;
3466
3467 ep = &dev->ep[num + 1];
3468 dma = ep->dma;
3469
3470 if (!dma)
3471 continue;
3472
3473 /* clear ep's dma status */
3474 tmp = readl(&dma->dmastat);
3475 writel(tmp, &dma->dmastat);
3476
3477 /* dma sync*/
3478 if (dev->quirks & PLX_PCIE) {
3479 u32 r_dmacount = readl(&dma->dmacount);
3480 if (!ep->is_in && (r_dmacount & 0x00FFFFFF) &&
3481 (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3482 continue;
3483 }
3484
3485 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3486 ep_dbg(ep->dev, "%s no xact done? %08x\n",
3487 ep->ep.name, tmp);
3488 continue;
3489 }
3490 stop_dma(ep->dma);
3491
3492 /* OUT transfers terminate when the data from the
3493 * host is in our memory. Process whatever's done.
3494 * On this path, we know transfer's last packet wasn't
3495 * less than req->length. NAK_OUT_PACKETS may be set,
3496 * or the FIFO may already be holding new packets.
3497 *
3498 * IN transfers can linger in the FIFO for a very
3499 * long time ... we ignore that for now, accounting
3500 * precisely (like PIO does) needs per-packet irqs
3501 */
3502 scan_dma_completions(ep);
3503
3504 /* disable dma on inactive queues; else maybe restart */
3505 if (!list_empty(&ep->queue)) {
3506 tmp = readl(&dma->dmactl);
3507 restart_dma(ep);
3508 }
3509 ep->irqs++;
3510 }
3511
3512 /* NOTE: there are other PCI errors we might usefully notice.
3513 * if they appear very often, here's where to try recovering.
3514 */
3515 if (stat & PCI_ERROR_INTERRUPTS) {
3516 ep_err(dev, "pci dma error; stat %08x\n", stat);
3517 stat &= ~PCI_ERROR_INTERRUPTS;
3518 /* these are fatal errors, but "maybe" they won't
3519 * happen again ...
3520 */
3521 stop_activity(dev, dev->driver);
3522 ep0_start(dev);
3523 stat = 0;
3524 }
3525
3526 if (stat)
3527 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3528 }
3529
net2280_irq(int irq,void * _dev)3530 static irqreturn_t net2280_irq(int irq, void *_dev)
3531 {
3532 struct net2280 *dev = _dev;
3533
3534 /* shared interrupt, not ours */
3535 if ((dev->quirks & PLX_LEGACY) &&
3536 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3537 return IRQ_NONE;
3538
3539 spin_lock(&dev->lock);
3540
3541 /* handle disconnect, dma, and more */
3542 handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3543
3544 /* control requests and PIO */
3545 handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3546
3547 if (dev->quirks & PLX_PCIE) {
3548 /* re-enable interrupt to trigger any possible new interrupt */
3549 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3550 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3551 writel(pciirqenb1, &dev->regs->pciirqenb1);
3552 }
3553
3554 spin_unlock(&dev->lock);
3555
3556 return IRQ_HANDLED;
3557 }
3558
3559 /*-------------------------------------------------------------------------*/
3560
gadget_release(struct device * _dev)3561 static void gadget_release(struct device *_dev)
3562 {
3563 struct net2280 *dev = container_of(_dev, struct net2280, gadget.dev);
3564
3565 kfree(dev);
3566 }
3567
3568 /* tear down the binding between this driver and the pci device */
3569
net2280_remove(struct pci_dev * pdev)3570 static void net2280_remove(struct pci_dev *pdev)
3571 {
3572 struct net2280 *dev = pci_get_drvdata(pdev);
3573
3574 if (dev->added)
3575 usb_del_gadget(&dev->gadget);
3576
3577 BUG_ON(dev->driver);
3578
3579 /* then clean up the resources we allocated during probe() */
3580 if (dev->requests) {
3581 int i;
3582 for (i = 1; i < 5; i++) {
3583 if (!dev->ep[i].dummy)
3584 continue;
3585 dma_pool_free(dev->requests, dev->ep[i].dummy,
3586 dev->ep[i].td_dma);
3587 }
3588 dma_pool_destroy(dev->requests);
3589 }
3590 if (dev->got_irq)
3591 free_irq(pdev->irq, dev);
3592 if (dev->quirks & PLX_PCIE)
3593 pci_disable_msi(pdev);
3594 if (dev->regs) {
3595 net2280_led_shutdown(dev);
3596 iounmap(dev->regs);
3597 }
3598 if (dev->region)
3599 release_mem_region(pci_resource_start(pdev, 0),
3600 pci_resource_len(pdev, 0));
3601 if (dev->enabled)
3602 pci_disable_device(pdev);
3603 device_remove_file(&pdev->dev, &dev_attr_registers);
3604
3605 ep_info(dev, "unbind\n");
3606 usb_put_gadget(&dev->gadget);
3607 }
3608
3609 /* wrap this driver around the specified device, but
3610 * don't respond over USB until a gadget driver binds to us.
3611 */
3612
net2280_probe(struct pci_dev * pdev,const struct pci_device_id * id)3613 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3614 {
3615 struct net2280 *dev;
3616 unsigned long resource, len;
3617 void __iomem *base = NULL;
3618 int retval, i;
3619
3620 /* alloc, and start init */
3621 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3622 if (dev == NULL) {
3623 retval = -ENOMEM;
3624 goto done;
3625 }
3626
3627 pci_set_drvdata(pdev, dev);
3628 usb_initialize_gadget(&pdev->dev, &dev->gadget, gadget_release);
3629 spin_lock_init(&dev->lock);
3630 dev->quirks = id->driver_data;
3631 dev->pdev = pdev;
3632 dev->gadget.ops = &net2280_ops;
3633 dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3634 USB_SPEED_SUPER : USB_SPEED_HIGH;
3635
3636 /* the "gadget" abstracts/virtualizes the controller */
3637 dev->gadget.name = driver_name;
3638
3639 /* now all the pci goodies ... */
3640 if (pci_enable_device(pdev) < 0) {
3641 retval = -ENODEV;
3642 goto done;
3643 }
3644 dev->enabled = 1;
3645
3646 /* BAR 0 holds all the registers
3647 * BAR 1 is 8051 memory; unused here (note erratum 0103)
3648 * BAR 2 is fifo memory; unused here
3649 */
3650 resource = pci_resource_start(pdev, 0);
3651 len = pci_resource_len(pdev, 0);
3652 if (!request_mem_region(resource, len, driver_name)) {
3653 ep_dbg(dev, "controller already in use\n");
3654 retval = -EBUSY;
3655 goto done;
3656 }
3657 dev->region = 1;
3658
3659 /* FIXME provide firmware download interface to put
3660 * 8051 code into the chip, e.g. to turn on PCI PM.
3661 */
3662
3663 base = ioremap(resource, len);
3664 if (base == NULL) {
3665 ep_dbg(dev, "can't map memory\n");
3666 retval = -EFAULT;
3667 goto done;
3668 }
3669 dev->regs = (struct net2280_regs __iomem *) base;
3670 dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3671 dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3672 dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3673 dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3674 dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3675
3676 if (dev->quirks & PLX_PCIE) {
3677 u32 fsmvalue;
3678 u32 usbstat;
3679 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3680 (base + 0x00b4);
3681 dev->llregs = (struct usb338x_ll_regs __iomem *)
3682 (base + 0x0700);
3683 dev->plregs = (struct usb338x_pl_regs __iomem *)
3684 (base + 0x0800);
3685 usbstat = readl(&dev->usb->usbstat);
3686 dev->enhanced_mode = !!(usbstat & BIT(11));
3687 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3688 /* put into initial config, link up all endpoints */
3689 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3690 (0xf << DEFECT7374_FSM_FIELD);
3691 /* See if firmware needs to set up for workaround: */
3692 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3693 dev->bug7734_patched = 1;
3694 writel(0, &dev->usb->usbctl);
3695 } else
3696 dev->bug7734_patched = 0;
3697 } else {
3698 dev->enhanced_mode = 0;
3699 dev->n_ep = 7;
3700 /* put into initial config, link up all endpoints */
3701 writel(0, &dev->usb->usbctl);
3702 }
3703
3704 usb_reset(dev);
3705 usb_reinit(dev);
3706
3707 /* irq setup after old hardware is cleaned up */
3708 if (!pdev->irq) {
3709 ep_err(dev, "No IRQ. Check PCI setup!\n");
3710 retval = -ENODEV;
3711 goto done;
3712 }
3713
3714 if (dev->quirks & PLX_PCIE)
3715 if (pci_enable_msi(pdev))
3716 ep_err(dev, "Failed to enable MSI mode\n");
3717
3718 if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3719 driver_name, dev)) {
3720 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3721 retval = -EBUSY;
3722 goto done;
3723 }
3724 dev->got_irq = 1;
3725
3726 /* DMA setup */
3727 /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */
3728 dev->requests = dma_pool_create("requests", &pdev->dev,
3729 sizeof(struct net2280_dma),
3730 0 /* no alignment requirements */,
3731 0 /* or page-crossing issues */);
3732 if (!dev->requests) {
3733 ep_dbg(dev, "can't get request pool\n");
3734 retval = -ENOMEM;
3735 goto done;
3736 }
3737 for (i = 1; i < 5; i++) {
3738 struct net2280_dma *td;
3739
3740 td = dma_pool_alloc(dev->requests, GFP_KERNEL,
3741 &dev->ep[i].td_dma);
3742 if (!td) {
3743 ep_dbg(dev, "can't get dummy %d\n", i);
3744 retval = -ENOMEM;
3745 goto done;
3746 }
3747 td->dmacount = 0; /* not VALID */
3748 td->dmadesc = td->dmaaddr;
3749 dev->ep[i].dummy = td;
3750 }
3751
3752 /* enable lower-overhead pci memory bursts during DMA */
3753 if (dev->quirks & PLX_LEGACY)
3754 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3755 /*
3756 * 256 write retries may not be enough...
3757 BIT(PCI_RETRY_ABORT_ENABLE) |
3758 */
3759 BIT(DMA_READ_MULTIPLE_ENABLE) |
3760 BIT(DMA_READ_LINE_ENABLE),
3761 &dev->pci->pcimstctl);
3762 /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3763 pci_set_master(pdev);
3764 pci_try_set_mwi(pdev);
3765
3766 /* ... also flushes any posted pci writes */
3767 dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3768
3769 /* done */
3770 ep_info(dev, "%s\n", driver_desc);
3771 ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3772 pdev->irq, base, dev->chiprev);
3773 ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3774 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3775 retval = device_create_file(&pdev->dev, &dev_attr_registers);
3776 if (retval)
3777 goto done;
3778
3779 retval = usb_add_gadget(&dev->gadget);
3780 if (retval)
3781 goto done;
3782 dev->added = 1;
3783 return 0;
3784
3785 done:
3786 if (dev) {
3787 net2280_remove(pdev);
3788 kfree(dev);
3789 }
3790 return retval;
3791 }
3792
3793 /* make sure the board is quiescent; otherwise it will continue
3794 * generating IRQs across the upcoming reboot.
3795 */
3796
net2280_shutdown(struct pci_dev * pdev)3797 static void net2280_shutdown(struct pci_dev *pdev)
3798 {
3799 struct net2280 *dev = pci_get_drvdata(pdev);
3800
3801 /* disable IRQs */
3802 writel(0, &dev->regs->pciirqenb0);
3803 writel(0, &dev->regs->pciirqenb1);
3804
3805 /* disable the pullup so the host will think we're gone */
3806 writel(0, &dev->usb->usbctl);
3807
3808 }
3809
3810
3811 /*-------------------------------------------------------------------------*/
3812
3813 static const struct pci_device_id pci_ids[] = { {
3814 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3815 .class_mask = ~0,
3816 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3817 .device = 0x2280,
3818 .subvendor = PCI_ANY_ID,
3819 .subdevice = PCI_ANY_ID,
3820 .driver_data = PLX_LEGACY | PLX_2280,
3821 }, {
3822 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3823 .class_mask = ~0,
3824 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3825 .device = 0x2282,
3826 .subvendor = PCI_ANY_ID,
3827 .subdevice = PCI_ANY_ID,
3828 .driver_data = PLX_LEGACY,
3829 },
3830 {
3831 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3832 .class_mask = ~0,
3833 .vendor = PCI_VENDOR_ID_PLX,
3834 .device = 0x2380,
3835 .subvendor = PCI_ANY_ID,
3836 .subdevice = PCI_ANY_ID,
3837 .driver_data = PLX_PCIE,
3838 },
3839 {
3840 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3841 .class_mask = ~0,
3842 .vendor = PCI_VENDOR_ID_PLX,
3843 .device = 0x3380,
3844 .subvendor = PCI_ANY_ID,
3845 .subdevice = PCI_ANY_ID,
3846 .driver_data = PLX_PCIE | PLX_SUPERSPEED,
3847 },
3848 {
3849 .class = PCI_CLASS_SERIAL_USB_DEVICE,
3850 .class_mask = ~0,
3851 .vendor = PCI_VENDOR_ID_PLX,
3852 .device = 0x3382,
3853 .subvendor = PCI_ANY_ID,
3854 .subdevice = PCI_ANY_ID,
3855 .driver_data = PLX_PCIE | PLX_SUPERSPEED,
3856 },
3857 { /* end: all zeroes */ }
3858 };
3859 MODULE_DEVICE_TABLE(pci, pci_ids);
3860
3861 /* pci driver glue; this is a "new style" PCI driver module */
3862 static struct pci_driver net2280_pci_driver = {
3863 .name = driver_name,
3864 .id_table = pci_ids,
3865
3866 .probe = net2280_probe,
3867 .remove = net2280_remove,
3868 .shutdown = net2280_shutdown,
3869
3870 /* FIXME add power management support */
3871 };
3872
3873 module_pci_driver(net2280_pci_driver);
3874
3875 MODULE_DESCRIPTION(DRIVER_DESC);
3876 MODULE_AUTHOR("David Brownell");
3877 MODULE_LICENSE("GPL");
3878