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1da177e4 LT |
1 | /* |
2 | * Driver for the PLX NET2280 USB device controller. | |
3 | * Specs and errata are available from <http://www.plxtech.com>. | |
4 | * | |
5 | * PLX Technology Inc. (formerly NetChip Technology) supported the | |
6 | * development of this driver. | |
7 | * | |
8 | * | |
9 | * CODE STATUS HIGHLIGHTS | |
10 | * | |
11 | * This driver should work well with most "gadget" drivers, including | |
12 | * the File Storage, Serial, and Ethernet/RNDIS gadget drivers | |
13 | * as well as Gadget Zero and Gadgetfs. | |
14 | * | |
15 | * DMA is enabled by default. Drivers using transfer queues might use | |
16 | * DMA chaining to remove IRQ latencies between transfers. (Except when | |
17 | * short OUT transfers happen.) Drivers can use the req->no_interrupt | |
18 | * hint to completely eliminate some IRQs, if a later IRQ is guaranteed | |
19 | * and DMA chaining is 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 | * | |
29 | * This program is free software; you can redistribute it and/or modify | |
30 | * it under the terms of the GNU General Public License as published by | |
31 | * the Free Software Foundation; either version 2 of the License, or | |
32 | * (at your option) any later version. | |
33 | * | |
34 | * This program is distributed in the hope that it will be useful, | |
35 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
36 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
37 | * GNU General Public License for more details. | |
38 | * | |
39 | * You should have received a copy of the GNU General Public License | |
40 | * along with this program; if not, write to the Free Software | |
41 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
42 | */ | |
43 | ||
44 | #undef DEBUG /* messages on error and most fault paths */ | |
45 | #undef VERBOSE /* extra debug messages (success too) */ | |
46 | ||
47 | #include <linux/config.h> | |
48 | #include <linux/module.h> | |
49 | #include <linux/pci.h> | |
50 | #include <linux/kernel.h> | |
51 | #include <linux/delay.h> | |
52 | #include <linux/ioport.h> | |
53 | #include <linux/sched.h> | |
54 | #include <linux/slab.h> | |
55 | #include <linux/smp_lock.h> | |
56 | #include <linux/errno.h> | |
57 | #include <linux/init.h> | |
58 | #include <linux/timer.h> | |
59 | #include <linux/list.h> | |
60 | #include <linux/interrupt.h> | |
61 | #include <linux/moduleparam.h> | |
62 | #include <linux/device.h> | |
63 | #include <linux/usb_ch9.h> | |
64 | #include <linux/usb_gadget.h> | |
65 | ||
66 | #include <asm/byteorder.h> | |
67 | #include <asm/io.h> | |
68 | #include <asm/irq.h> | |
69 | #include <asm/system.h> | |
70 | #include <asm/unaligned.h> | |
71 | ||
72 | ||
73 | #define DRIVER_DESC "PLX NET2280 USB Peripheral Controller" | |
74 | #define DRIVER_VERSION "2005 Feb 03" | |
75 | ||
76 | #define DMA_ADDR_INVALID (~(dma_addr_t)0) | |
77 | #define EP_DONTUSE 13 /* nonzero */ | |
78 | ||
79 | #define USE_RDK_LEDS /* GPIO pins control three LEDs */ | |
80 | ||
81 | ||
82 | static const char driver_name [] = "net2280"; | |
83 | static const char driver_desc [] = DRIVER_DESC; | |
84 | ||
85 | static const char ep0name [] = "ep0"; | |
86 | static const char *ep_name [] = { | |
87 | ep0name, | |
88 | "ep-a", "ep-b", "ep-c", "ep-d", | |
89 | "ep-e", "ep-f", | |
90 | }; | |
91 | ||
92 | /* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO) | |
93 | * use_dma_chaining -- dma descriptor queueing gives even more irq reduction | |
94 | * | |
95 | * The net2280 DMA engines are not tightly integrated with their FIFOs; | |
96 | * not all cases are (yet) handled well in this driver or the silicon. | |
97 | * Some gadget drivers work better with the dma support here than others. | |
98 | * These two parameters let you use PIO or more aggressive DMA. | |
99 | */ | |
100 | static int use_dma = 1; | |
101 | static int use_dma_chaining = 0; | |
102 | ||
103 | /* "modprobe net2280 use_dma=n" etc */ | |
104 | module_param (use_dma, bool, S_IRUGO); | |
105 | module_param (use_dma_chaining, bool, S_IRUGO); | |
106 | ||
107 | ||
108 | /* mode 0 == ep-{a,b,c,d} 1K fifo each | |
109 | * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable | |
110 | * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable | |
111 | */ | |
112 | static ushort fifo_mode = 0; | |
113 | ||
114 | /* "modprobe net2280 fifo_mode=1" etc */ | |
115 | module_param (fifo_mode, ushort, 0644); | |
116 | ||
117 | /* enable_suspend -- When enabled, the driver will respond to | |
118 | * USB suspend requests by powering down the NET2280. Otherwise, | |
119 | * USB suspend requests will be ignored. This is acceptible for | |
120 | * self-powered devices, and helps avoid some quirks. | |
121 | */ | |
122 | static int enable_suspend = 0; | |
123 | ||
124 | /* "modprobe net2280 enable_suspend=1" etc */ | |
125 | module_param (enable_suspend, bool, S_IRUGO); | |
126 | ||
127 | ||
128 | #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out") | |
129 | ||
130 | #if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG) | |
131 | static char *type_string (u8 bmAttributes) | |
132 | { | |
133 | switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) { | |
134 | case USB_ENDPOINT_XFER_BULK: return "bulk"; | |
135 | case USB_ENDPOINT_XFER_ISOC: return "iso"; | |
136 | case USB_ENDPOINT_XFER_INT: return "intr"; | |
137 | }; | |
138 | return "control"; | |
139 | } | |
140 | #endif | |
141 | ||
142 | #include "net2280.h" | |
143 | ||
144 | #define valid_bit __constant_cpu_to_le32 (1 << VALID_BIT) | |
145 | #define dma_done_ie __constant_cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE) | |
146 | ||
147 | /*-------------------------------------------------------------------------*/ | |
148 | ||
149 | static int | |
150 | net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) | |
151 | { | |
152 | struct net2280 *dev; | |
153 | struct net2280_ep *ep; | |
154 | u32 max, tmp; | |
155 | unsigned long flags; | |
156 | ||
157 | ep = container_of (_ep, struct net2280_ep, ep); | |
158 | if (!_ep || !desc || ep->desc || _ep->name == ep0name | |
159 | || desc->bDescriptorType != USB_DT_ENDPOINT) | |
160 | return -EINVAL; | |
161 | dev = ep->dev; | |
162 | if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) | |
163 | return -ESHUTDOWN; | |
164 | ||
165 | /* erratum 0119 workaround ties up an endpoint number */ | |
166 | if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) | |
167 | return -EDOM; | |
168 | ||
169 | /* sanity check ep-e/ep-f since their fifos are small */ | |
170 | max = le16_to_cpu (desc->wMaxPacketSize) & 0x1fff; | |
171 | if (ep->num > 4 && max > 64) | |
172 | return -ERANGE; | |
173 | ||
174 | spin_lock_irqsave (&dev->lock, flags); | |
175 | _ep->maxpacket = max & 0x7ff; | |
176 | ep->desc = desc; | |
177 | ||
178 | /* ep_reset() has already been called */ | |
179 | ep->stopped = 0; | |
180 | ep->out_overflow = 0; | |
181 | ||
182 | /* set speed-dependent max packet; may kick in high bandwidth */ | |
183 | set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max); | |
184 | ||
185 | /* FIFO lines can't go to different packets. PIO is ok, so | |
186 | * use it instead of troublesome (non-bulk) multi-packet DMA. | |
187 | */ | |
188 | if (ep->dma && (max % 4) != 0 && use_dma_chaining) { | |
189 | DEBUG (ep->dev, "%s, no dma for maxpacket %d\n", | |
190 | ep->ep.name, ep->ep.maxpacket); | |
191 | ep->dma = NULL; | |
192 | } | |
193 | ||
194 | /* set type, direction, address; reset fifo counters */ | |
195 | writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat); | |
196 | tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK); | |
197 | if (tmp == USB_ENDPOINT_XFER_INT) { | |
198 | /* erratum 0105 workaround prevents hs NYET */ | |
199 | if (dev->chiprev == 0100 | |
200 | && dev->gadget.speed == USB_SPEED_HIGH | |
201 | && !(desc->bEndpointAddress & USB_DIR_IN)) | |
202 | writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE), | |
203 | &ep->regs->ep_rsp); | |
204 | } else if (tmp == USB_ENDPOINT_XFER_BULK) { | |
205 | /* catch some particularly blatant driver bugs */ | |
206 | if ((dev->gadget.speed == USB_SPEED_HIGH | |
207 | && max != 512) | |
208 | || (dev->gadget.speed == USB_SPEED_FULL | |
209 | && max > 64)) { | |
210 | spin_unlock_irqrestore (&dev->lock, flags); | |
211 | return -ERANGE; | |
212 | } | |
213 | } | |
214 | ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0; | |
215 | tmp <<= ENDPOINT_TYPE; | |
216 | tmp |= desc->bEndpointAddress; | |
217 | tmp |= (4 << ENDPOINT_BYTE_COUNT); /* default full fifo lines */ | |
218 | tmp |= 1 << ENDPOINT_ENABLE; | |
219 | wmb (); | |
220 | ||
221 | /* for OUT transfers, block the rx fifo until a read is posted */ | |
222 | ep->is_in = (tmp & USB_DIR_IN) != 0; | |
223 | if (!ep->is_in) | |
224 | writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp); | |
225 | ||
226 | writel (tmp, &ep->regs->ep_cfg); | |
227 | ||
228 | /* enable irqs */ | |
229 | if (!ep->dma) { /* pio, per-packet */ | |
230 | tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0); | |
231 | writel (tmp, &dev->regs->pciirqenb0); | |
232 | ||
233 | tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) | |
234 | | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE) | |
235 | | readl (&ep->regs->ep_irqenb); | |
236 | writel (tmp, &ep->regs->ep_irqenb); | |
237 | } else { /* dma, per-request */ | |
238 | tmp = (1 << (8 + ep->num)); /* completion */ | |
239 | tmp |= readl (&dev->regs->pciirqenb1); | |
240 | writel (tmp, &dev->regs->pciirqenb1); | |
241 | ||
242 | /* for short OUT transfers, dma completions can't | |
243 | * advance the queue; do it pio-style, by hand. | |
244 | * NOTE erratum 0112 workaround #2 | |
245 | */ | |
246 | if ((desc->bEndpointAddress & USB_DIR_IN) == 0) { | |
247 | tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE); | |
248 | writel (tmp, &ep->regs->ep_irqenb); | |
249 | ||
250 | tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0); | |
251 | writel (tmp, &dev->regs->pciirqenb0); | |
252 | } | |
253 | } | |
254 | ||
255 | tmp = desc->bEndpointAddress; | |
256 | DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n", | |
257 | _ep->name, tmp & 0x0f, DIR_STRING (tmp), | |
258 | type_string (desc->bmAttributes), | |
259 | ep->dma ? "dma" : "pio", max); | |
260 | ||
261 | /* pci writes may still be posted */ | |
262 | spin_unlock_irqrestore (&dev->lock, flags); | |
263 | return 0; | |
264 | } | |
265 | ||
266 | static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec) | |
267 | { | |
268 | u32 result; | |
269 | ||
270 | do { | |
271 | result = readl (ptr); | |
272 | if (result == ~(u32)0) /* "device unplugged" */ | |
273 | return -ENODEV; | |
274 | result &= mask; | |
275 | if (result == done) | |
276 | return 0; | |
277 | udelay (1); | |
278 | usec--; | |
279 | } while (usec > 0); | |
280 | return -ETIMEDOUT; | |
281 | } | |
282 | ||
283 | static struct usb_ep_ops net2280_ep_ops; | |
284 | ||
285 | static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep) | |
286 | { | |
287 | u32 tmp; | |
288 | ||
289 | ep->desc = NULL; | |
290 | INIT_LIST_HEAD (&ep->queue); | |
291 | ||
292 | ep->ep.maxpacket = ~0; | |
293 | ep->ep.ops = &net2280_ep_ops; | |
294 | ||
295 | /* disable the dma, irqs, endpoint... */ | |
296 | if (ep->dma) { | |
297 | writel (0, &ep->dma->dmactl); | |
298 | writel ( (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT) | |
299 | | (1 << DMA_TRANSACTION_DONE_INTERRUPT) | |
300 | | (1 << DMA_ABORT) | |
301 | , &ep->dma->dmastat); | |
302 | ||
303 | tmp = readl (®s->pciirqenb0); | |
304 | tmp &= ~(1 << ep->num); | |
305 | writel (tmp, ®s->pciirqenb0); | |
306 | } else { | |
307 | tmp = readl (®s->pciirqenb1); | |
308 | tmp &= ~(1 << (8 + ep->num)); /* completion */ | |
309 | writel (tmp, ®s->pciirqenb1); | |
310 | } | |
311 | writel (0, &ep->regs->ep_irqenb); | |
312 | ||
313 | /* init to our chosen defaults, notably so that we NAK OUT | |
314 | * packets until the driver queues a read (+note erratum 0112) | |
315 | */ | |
316 | tmp = (1 << SET_NAK_OUT_PACKETS_MODE) | |
317 | | (1 << SET_NAK_OUT_PACKETS) | |
318 | | (1 << CLEAR_EP_HIDE_STATUS_PHASE) | |
319 | | (1 << CLEAR_INTERRUPT_MODE); | |
320 | ||
321 | if (ep->num != 0) { | |
322 | tmp |= (1 << CLEAR_ENDPOINT_TOGGLE) | |
323 | | (1 << CLEAR_ENDPOINT_HALT); | |
324 | } | |
325 | writel (tmp, &ep->regs->ep_rsp); | |
326 | ||
327 | /* scrub most status bits, and flush any fifo state */ | |
328 | writel ( (1 << TIMEOUT) | |
329 | | (1 << USB_STALL_SENT) | |
330 | | (1 << USB_IN_NAK_SENT) | |
331 | | (1 << USB_IN_ACK_RCVD) | |
332 | | (1 << USB_OUT_PING_NAK_SENT) | |
333 | | (1 << USB_OUT_ACK_SENT) | |
334 | | (1 << FIFO_OVERFLOW) | |
335 | | (1 << FIFO_UNDERFLOW) | |
336 | | (1 << FIFO_FLUSH) | |
337 | | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT) | |
338 | | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) | |
339 | | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
340 | | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | |
341 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
342 | | (1 << DATA_IN_TOKEN_INTERRUPT) | |
343 | , &ep->regs->ep_stat); | |
344 | ||
345 | /* fifo size is handled separately */ | |
346 | } | |
347 | ||
348 | static void nuke (struct net2280_ep *); | |
349 | ||
350 | static int net2280_disable (struct usb_ep *_ep) | |
351 | { | |
352 | struct net2280_ep *ep; | |
353 | unsigned long flags; | |
354 | ||
355 | ep = container_of (_ep, struct net2280_ep, ep); | |
356 | if (!_ep || !ep->desc || _ep->name == ep0name) | |
357 | return -EINVAL; | |
358 | ||
359 | spin_lock_irqsave (&ep->dev->lock, flags); | |
360 | nuke (ep); | |
361 | ep_reset (ep->dev->regs, ep); | |
362 | ||
363 | VDEBUG (ep->dev, "disabled %s %s\n", | |
364 | ep->dma ? "dma" : "pio", _ep->name); | |
365 | ||
366 | /* synch memory views with the device */ | |
367 | (void) readl (&ep->regs->ep_cfg); | |
368 | ||
369 | if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4) | |
370 | ep->dma = &ep->dev->dma [ep->num - 1]; | |
371 | ||
372 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
373 | return 0; | |
374 | } | |
375 | ||
376 | /*-------------------------------------------------------------------------*/ | |
377 | ||
378 | static struct usb_request * | |
379 | net2280_alloc_request (struct usb_ep *_ep, int gfp_flags) | |
380 | { | |
381 | struct net2280_ep *ep; | |
382 | struct net2280_request *req; | |
383 | ||
384 | if (!_ep) | |
385 | return NULL; | |
386 | ep = container_of (_ep, struct net2280_ep, ep); | |
387 | ||
388 | req = kmalloc (sizeof *req, gfp_flags); | |
389 | if (!req) | |
390 | return NULL; | |
391 | ||
392 | memset (req, 0, sizeof *req); | |
393 | req->req.dma = DMA_ADDR_INVALID; | |
394 | INIT_LIST_HEAD (&req->queue); | |
395 | ||
396 | /* this dma descriptor may be swapped with the previous dummy */ | |
397 | if (ep->dma) { | |
398 | struct net2280_dma *td; | |
399 | ||
400 | td = pci_pool_alloc (ep->dev->requests, gfp_flags, | |
401 | &req->td_dma); | |
402 | if (!td) { | |
403 | kfree (req); | |
404 | return NULL; | |
405 | } | |
406 | td->dmacount = 0; /* not VALID */ | |
407 | td->dmaaddr = __constant_cpu_to_le32 (DMA_ADDR_INVALID); | |
408 | td->dmadesc = td->dmaaddr; | |
409 | req->td = td; | |
410 | } | |
411 | return &req->req; | |
412 | } | |
413 | ||
414 | static void | |
415 | net2280_free_request (struct usb_ep *_ep, struct usb_request *_req) | |
416 | { | |
417 | struct net2280_ep *ep; | |
418 | struct net2280_request *req; | |
419 | ||
420 | ep = container_of (_ep, struct net2280_ep, ep); | |
421 | if (!_ep || !_req) | |
422 | return; | |
423 | ||
424 | req = container_of (_req, struct net2280_request, req); | |
425 | WARN_ON (!list_empty (&req->queue)); | |
426 | if (req->td) | |
427 | pci_pool_free (ep->dev->requests, req->td, req->td_dma); | |
428 | kfree (req); | |
429 | } | |
430 | ||
431 | /*-------------------------------------------------------------------------*/ | |
432 | ||
433 | #undef USE_KMALLOC | |
434 | ||
435 | /* many common platforms have dma-coherent caches, which means that it's | |
436 | * safe to use kmalloc() memory for all i/o buffers without using any | |
437 | * cache flushing calls. (unless you're trying to share cache lines | |
438 | * between dma and non-dma activities, which is a slow idea in any case.) | |
439 | * | |
440 | * other platforms need more care, with 2.5 having a moderately general | |
441 | * solution (which falls down for allocations smaller than one page) | |
442 | * that improves significantly on the 2.4 PCI allocators by removing | |
443 | * the restriction that memory never be freed in_interrupt(). | |
444 | */ | |
445 | #if defined(CONFIG_X86) | |
446 | #define USE_KMALLOC | |
447 | ||
448 | #elif defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE) | |
449 | #define USE_KMALLOC | |
450 | ||
451 | #elif defined(CONFIG_MIPS) && !defined(CONFIG_NONCOHERENT_IO) | |
452 | #define USE_KMALLOC | |
453 | ||
454 | /* FIXME there are other cases, including an x86-64 one ... */ | |
455 | #endif | |
456 | ||
457 | /* allocating buffers this way eliminates dma mapping overhead, which | |
458 | * on some platforms will mean eliminating a per-io buffer copy. with | |
459 | * some kinds of system caches, further tweaks may still be needed. | |
460 | */ | |
461 | static void * | |
462 | net2280_alloc_buffer ( | |
463 | struct usb_ep *_ep, | |
464 | unsigned bytes, | |
465 | dma_addr_t *dma, | |
466 | int gfp_flags | |
467 | ) | |
468 | { | |
469 | void *retval; | |
470 | struct net2280_ep *ep; | |
471 | ||
472 | ep = container_of (_ep, struct net2280_ep, ep); | |
473 | if (!_ep) | |
474 | return NULL; | |
475 | *dma = DMA_ADDR_INVALID; | |
476 | ||
477 | #if defined(USE_KMALLOC) | |
478 | retval = kmalloc(bytes, gfp_flags); | |
479 | if (retval) | |
480 | *dma = virt_to_phys(retval); | |
481 | #else | |
482 | if (ep->dma) { | |
483 | /* the main problem with this call is that it wastes memory | |
484 | * on typical 1/N page allocations: it allocates 1-N pages. | |
485 | */ | |
486 | #warning Using dma_alloc_coherent even with buffers smaller than a page. | |
487 | retval = dma_alloc_coherent(&ep->dev->pdev->dev, | |
488 | bytes, dma, gfp_flags); | |
489 | } else | |
490 | retval = kmalloc(bytes, gfp_flags); | |
491 | #endif | |
492 | return retval; | |
493 | } | |
494 | ||
495 | static void | |
496 | net2280_free_buffer ( | |
497 | struct usb_ep *_ep, | |
498 | void *buf, | |
499 | dma_addr_t dma, | |
500 | unsigned bytes | |
501 | ) { | |
502 | /* free memory into the right allocator */ | |
503 | #ifndef USE_KMALLOC | |
504 | if (dma != DMA_ADDR_INVALID) { | |
505 | struct net2280_ep *ep; | |
506 | ||
507 | ep = container_of(_ep, struct net2280_ep, ep); | |
508 | if (!_ep) | |
509 | return; | |
510 | dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma); | |
511 | } else | |
512 | #endif | |
513 | kfree (buf); | |
514 | } | |
515 | ||
516 | /*-------------------------------------------------------------------------*/ | |
517 | ||
518 | /* load a packet into the fifo we use for usb IN transfers. | |
519 | * works for all endpoints. | |
520 | * | |
521 | * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo | |
522 | * at a time, but this code is simpler because it knows it only writes | |
523 | * one packet. ep-a..ep-d should use dma instead. | |
524 | */ | |
525 | static void | |
526 | write_fifo (struct net2280_ep *ep, struct usb_request *req) | |
527 | { | |
528 | struct net2280_ep_regs __iomem *regs = ep->regs; | |
529 | u8 *buf; | |
530 | u32 tmp; | |
531 | unsigned count, total; | |
532 | ||
533 | /* INVARIANT: fifo is currently empty. (testable) */ | |
534 | ||
535 | if (req) { | |
536 | buf = req->buf + req->actual; | |
537 | prefetch (buf); | |
538 | total = req->length - req->actual; | |
539 | } else { | |
540 | total = 0; | |
541 | buf = NULL; | |
542 | } | |
543 | ||
544 | /* write just one packet at a time */ | |
545 | count = ep->ep.maxpacket; | |
546 | if (count > total) /* min() cannot be used on a bitfield */ | |
547 | count = total; | |
548 | ||
549 | VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n", | |
550 | ep->ep.name, count, | |
551 | (count != ep->ep.maxpacket) ? " (short)" : "", | |
552 | req); | |
553 | while (count >= 4) { | |
554 | /* NOTE be careful if you try to align these. fifo lines | |
555 | * should normally be full (4 bytes) and successive partial | |
556 | * lines are ok only in certain cases. | |
557 | */ | |
558 | tmp = get_unaligned ((u32 *)buf); | |
559 | cpu_to_le32s (&tmp); | |
560 | writel (tmp, ®s->ep_data); | |
561 | buf += 4; | |
562 | count -= 4; | |
563 | } | |
564 | ||
565 | /* last fifo entry is "short" unless we wrote a full packet. | |
566 | * also explicitly validate last word in (periodic) transfers | |
567 | * when maxpacket is not a multiple of 4 bytes. | |
568 | */ | |
569 | if (count || total < ep->ep.maxpacket) { | |
570 | tmp = count ? get_unaligned ((u32 *)buf) : count; | |
571 | cpu_to_le32s (&tmp); | |
572 | set_fifo_bytecount (ep, count & 0x03); | |
573 | writel (tmp, ®s->ep_data); | |
574 | } | |
575 | ||
576 | /* pci writes may still be posted */ | |
577 | } | |
578 | ||
579 | /* work around erratum 0106: PCI and USB race over the OUT fifo. | |
580 | * caller guarantees chiprev 0100, out endpoint is NAKing, and | |
581 | * there's no real data in the fifo. | |
582 | * | |
583 | * NOTE: also used in cases where that erratum doesn't apply: | |
584 | * where the host wrote "too much" data to us. | |
585 | */ | |
586 | static void out_flush (struct net2280_ep *ep) | |
587 | { | |
588 | u32 __iomem *statp; | |
589 | u32 tmp; | |
590 | ||
591 | ASSERT_OUT_NAKING (ep); | |
592 | ||
593 | statp = &ep->regs->ep_stat; | |
594 | writel ( (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
595 | | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
596 | , statp); | |
597 | writel ((1 << FIFO_FLUSH), statp); | |
598 | mb (); | |
599 | tmp = readl (statp); | |
600 | if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
601 | /* high speed did bulk NYET; fifo isn't filling */ | |
602 | && ep->dev->gadget.speed == USB_SPEED_FULL) { | |
603 | unsigned usec; | |
604 | ||
605 | usec = 50; /* 64 byte bulk/interrupt */ | |
606 | handshake (statp, (1 << USB_OUT_PING_NAK_SENT), | |
607 | (1 << USB_OUT_PING_NAK_SENT), usec); | |
608 | /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */ | |
609 | } | |
610 | } | |
611 | ||
612 | /* unload packet(s) from the fifo we use for usb OUT transfers. | |
613 | * returns true iff the request completed, because of short packet | |
614 | * or the request buffer having filled with full packets. | |
615 | * | |
616 | * for ep-a..ep-d this will read multiple packets out when they | |
617 | * have been accepted. | |
618 | */ | |
619 | static int | |
620 | read_fifo (struct net2280_ep *ep, struct net2280_request *req) | |
621 | { | |
622 | struct net2280_ep_regs __iomem *regs = ep->regs; | |
623 | u8 *buf = req->req.buf + req->req.actual; | |
624 | unsigned count, tmp, is_short; | |
625 | unsigned cleanup = 0, prevent = 0; | |
626 | ||
627 | /* erratum 0106 ... packets coming in during fifo reads might | |
628 | * be incompletely rejected. not all cases have workarounds. | |
629 | */ | |
630 | if (ep->dev->chiprev == 0x0100 | |
631 | && ep->dev->gadget.speed == USB_SPEED_FULL) { | |
632 | udelay (1); | |
633 | tmp = readl (&ep->regs->ep_stat); | |
634 | if ((tmp & (1 << NAK_OUT_PACKETS))) | |
635 | cleanup = 1; | |
636 | else if ((tmp & (1 << FIFO_FULL))) { | |
637 | start_out_naking (ep); | |
638 | prevent = 1; | |
639 | } | |
640 | /* else: hope we don't see the problem */ | |
641 | } | |
642 | ||
643 | /* never overflow the rx buffer. the fifo reads packets until | |
644 | * it sees a short one; we might not be ready for them all. | |
645 | */ | |
646 | prefetchw (buf); | |
647 | count = readl (®s->ep_avail); | |
648 | if (unlikely (count == 0)) { | |
649 | udelay (1); | |
650 | tmp = readl (&ep->regs->ep_stat); | |
651 | count = readl (®s->ep_avail); | |
652 | /* handled that data already? */ | |
653 | if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0) | |
654 | return 0; | |
655 | } | |
656 | ||
657 | tmp = req->req.length - req->req.actual; | |
658 | if (count > tmp) { | |
659 | /* as with DMA, data overflow gets flushed */ | |
660 | if ((tmp % ep->ep.maxpacket) != 0) { | |
661 | ERROR (ep->dev, | |
662 | "%s out fifo %d bytes, expected %d\n", | |
663 | ep->ep.name, count, tmp); | |
664 | req->req.status = -EOVERFLOW; | |
665 | cleanup = 1; | |
666 | /* NAK_OUT_PACKETS will be set, so flushing is safe; | |
667 | * the next read will start with the next packet | |
668 | */ | |
669 | } /* else it's a ZLP, no worries */ | |
670 | count = tmp; | |
671 | } | |
672 | req->req.actual += count; | |
673 | ||
674 | is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0); | |
675 | ||
676 | VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n", | |
677 | ep->ep.name, count, is_short ? " (short)" : "", | |
678 | cleanup ? " flush" : "", prevent ? " nak" : "", | |
679 | req, req->req.actual, req->req.length); | |
680 | ||
681 | while (count >= 4) { | |
682 | tmp = readl (®s->ep_data); | |
683 | cpu_to_le32s (&tmp); | |
684 | put_unaligned (tmp, (u32 *)buf); | |
685 | buf += 4; | |
686 | count -= 4; | |
687 | } | |
688 | if (count) { | |
689 | tmp = readl (®s->ep_data); | |
690 | /* LE conversion is implicit here: */ | |
691 | do { | |
692 | *buf++ = (u8) tmp; | |
693 | tmp >>= 8; | |
694 | } while (--count); | |
695 | } | |
696 | if (cleanup) | |
697 | out_flush (ep); | |
698 | if (prevent) { | |
699 | writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp); | |
700 | (void) readl (&ep->regs->ep_rsp); | |
701 | } | |
702 | ||
703 | return is_short || ((req->req.actual == req->req.length) | |
704 | && !req->req.zero); | |
705 | } | |
706 | ||
707 | /* fill out dma descriptor to match a given request */ | |
708 | static void | |
709 | fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid) | |
710 | { | |
711 | struct net2280_dma *td = req->td; | |
712 | u32 dmacount = req->req.length; | |
713 | ||
714 | /* don't let DMA continue after a short OUT packet, | |
715 | * so overruns can't affect the next transfer. | |
716 | * in case of overruns on max-size packets, we can't | |
717 | * stop the fifo from filling but we can flush it. | |
718 | */ | |
719 | if (ep->is_in) | |
720 | dmacount |= (1 << DMA_DIRECTION); | |
721 | else if ((dmacount % ep->ep.maxpacket) != 0) | |
722 | dmacount |= (1 << END_OF_CHAIN); | |
723 | ||
724 | req->valid = valid; | |
725 | if (valid) | |
726 | dmacount |= (1 << VALID_BIT); | |
727 | if (likely(!req->req.no_interrupt || !use_dma_chaining)) | |
728 | dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE); | |
729 | ||
730 | /* td->dmadesc = previously set by caller */ | |
731 | td->dmaaddr = cpu_to_le32 (req->req.dma); | |
732 | ||
733 | /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */ | |
734 | wmb (); | |
735 | td->dmacount = cpu_to_le32p (&dmacount); | |
736 | } | |
737 | ||
738 | static const u32 dmactl_default = | |
739 | (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT) | |
740 | | (1 << DMA_CLEAR_COUNT_ENABLE) | |
741 | /* erratum 0116 workaround part 1 (use POLLING) */ | |
742 | | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) | |
743 | | (1 << DMA_VALID_BIT_POLLING_ENABLE) | |
744 | | (1 << DMA_VALID_BIT_ENABLE) | |
745 | | (1 << DMA_SCATTER_GATHER_ENABLE) | |
746 | /* erratum 0116 workaround part 2 (no AUTOSTART) */ | |
747 | | (1 << DMA_ENABLE); | |
748 | ||
749 | static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma) | |
750 | { | |
751 | handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50); | |
752 | } | |
753 | ||
754 | static inline void stop_dma (struct net2280_dma_regs __iomem *dma) | |
755 | { | |
756 | writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl); | |
757 | spin_stop_dma (dma); | |
758 | } | |
759 | ||
760 | static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma) | |
761 | { | |
762 | struct net2280_dma_regs __iomem *dma = ep->dma; | |
763 | ||
764 | writel ((1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION), | |
765 | &dma->dmacount); | |
766 | writel (readl (&dma->dmastat), &dma->dmastat); | |
767 | ||
768 | writel (td_dma, &dma->dmadesc); | |
769 | writel (dmactl, &dma->dmactl); | |
770 | ||
771 | /* erratum 0116 workaround part 3: pci arbiter away from net2280 */ | |
772 | (void) readl (&ep->dev->pci->pcimstctl); | |
773 | ||
774 | writel ((1 << DMA_START), &dma->dmastat); | |
775 | ||
776 | if (!ep->is_in) | |
777 | stop_out_naking (ep); | |
778 | } | |
779 | ||
780 | static void start_dma (struct net2280_ep *ep, struct net2280_request *req) | |
781 | { | |
782 | u32 tmp; | |
783 | struct net2280_dma_regs __iomem *dma = ep->dma; | |
784 | ||
785 | /* FIXME can't use DMA for ZLPs */ | |
786 | ||
787 | /* on this path we "know" there's no dma active (yet) */ | |
788 | WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE)); | |
789 | writel (0, &ep->dma->dmactl); | |
790 | ||
791 | /* previous OUT packet might have been short */ | |
792 | if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat)) | |
793 | & (1 << NAK_OUT_PACKETS)) != 0) { | |
794 | writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT), | |
795 | &ep->regs->ep_stat); | |
796 | ||
797 | tmp = readl (&ep->regs->ep_avail); | |
798 | if (tmp) { | |
799 | writel (readl (&dma->dmastat), &dma->dmastat); | |
800 | ||
801 | /* transfer all/some fifo data */ | |
802 | writel (req->req.dma, &dma->dmaaddr); | |
803 | tmp = min (tmp, req->req.length); | |
804 | ||
805 | /* dma irq, faking scatterlist status */ | |
806 | req->td->dmacount = cpu_to_le32 (req->req.length - tmp); | |
807 | writel ((1 << DMA_DONE_INTERRUPT_ENABLE) | |
808 | | tmp, &dma->dmacount); | |
809 | req->td->dmadesc = 0; | |
810 | req->valid = 1; | |
811 | ||
812 | writel ((1 << DMA_ENABLE), &dma->dmactl); | |
813 | writel ((1 << DMA_START), &dma->dmastat); | |
814 | return; | |
815 | } | |
816 | } | |
817 | ||
818 | tmp = dmactl_default; | |
819 | ||
820 | /* force packet boundaries between dma requests, but prevent the | |
821 | * controller from automagically writing a last "short" packet | |
822 | * (zero length) unless the driver explicitly said to do that. | |
823 | */ | |
824 | if (ep->is_in) { | |
825 | if (likely ((req->req.length % ep->ep.maxpacket) != 0 | |
826 | || req->req.zero)) { | |
827 | tmp |= (1 << DMA_FIFO_VALIDATE); | |
828 | ep->in_fifo_validate = 1; | |
829 | } else | |
830 | ep->in_fifo_validate = 0; | |
831 | } | |
832 | ||
833 | /* init req->td, pointing to the current dummy */ | |
834 | req->td->dmadesc = cpu_to_le32 (ep->td_dma); | |
835 | fill_dma_desc (ep, req, 1); | |
836 | ||
837 | if (!use_dma_chaining) | |
838 | req->td->dmacount |= __constant_cpu_to_le32 (1 << END_OF_CHAIN); | |
839 | ||
840 | start_queue (ep, tmp, req->td_dma); | |
841 | } | |
842 | ||
843 | static inline void | |
844 | queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid) | |
845 | { | |
846 | struct net2280_dma *end; | |
847 | dma_addr_t tmp; | |
848 | ||
849 | /* swap new dummy for old, link; fill and maybe activate */ | |
850 | end = ep->dummy; | |
851 | ep->dummy = req->td; | |
852 | req->td = end; | |
853 | ||
854 | tmp = ep->td_dma; | |
855 | ep->td_dma = req->td_dma; | |
856 | req->td_dma = tmp; | |
857 | ||
858 | end->dmadesc = cpu_to_le32 (ep->td_dma); | |
859 | ||
860 | fill_dma_desc (ep, req, valid); | |
861 | } | |
862 | ||
863 | static void | |
864 | done (struct net2280_ep *ep, struct net2280_request *req, int status) | |
865 | { | |
866 | struct net2280 *dev; | |
867 | unsigned stopped = ep->stopped; | |
868 | ||
869 | list_del_init (&req->queue); | |
870 | ||
871 | if (req->req.status == -EINPROGRESS) | |
872 | req->req.status = status; | |
873 | else | |
874 | status = req->req.status; | |
875 | ||
876 | dev = ep->dev; | |
877 | if (req->mapped) { | |
878 | pci_unmap_single (dev->pdev, req->req.dma, req->req.length, | |
879 | ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); | |
880 | req->req.dma = DMA_ADDR_INVALID; | |
881 | req->mapped = 0; | |
882 | } | |
883 | ||
884 | if (status && status != -ESHUTDOWN) | |
885 | VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n", | |
886 | ep->ep.name, &req->req, status, | |
887 | req->req.actual, req->req.length); | |
888 | ||
889 | /* don't modify queue heads during completion callback */ | |
890 | ep->stopped = 1; | |
891 | spin_unlock (&dev->lock); | |
892 | req->req.complete (&ep->ep, &req->req); | |
893 | spin_lock (&dev->lock); | |
894 | ep->stopped = stopped; | |
895 | } | |
896 | ||
897 | /*-------------------------------------------------------------------------*/ | |
898 | ||
899 | static int | |
900 | net2280_queue (struct usb_ep *_ep, struct usb_request *_req, int gfp_flags) | |
901 | { | |
902 | struct net2280_request *req; | |
903 | struct net2280_ep *ep; | |
904 | struct net2280 *dev; | |
905 | unsigned long flags; | |
906 | ||
907 | /* we always require a cpu-view buffer, so that we can | |
908 | * always use pio (as fallback or whatever). | |
909 | */ | |
910 | req = container_of (_req, struct net2280_request, req); | |
911 | if (!_req || !_req->complete || !_req->buf | |
912 | || !list_empty (&req->queue)) | |
913 | return -EINVAL; | |
914 | if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) | |
915 | return -EDOM; | |
916 | ep = container_of (_ep, struct net2280_ep, ep); | |
917 | if (!_ep || (!ep->desc && ep->num != 0)) | |
918 | return -EINVAL; | |
919 | dev = ep->dev; | |
920 | if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) | |
921 | return -ESHUTDOWN; | |
922 | ||
923 | /* FIXME implement PIO fallback for ZLPs with DMA */ | |
924 | if (ep->dma && _req->length == 0) | |
925 | return -EOPNOTSUPP; | |
926 | ||
927 | /* set up dma mapping in case the caller didn't */ | |
928 | if (ep->dma && _req->dma == DMA_ADDR_INVALID) { | |
929 | _req->dma = pci_map_single (dev->pdev, _req->buf, _req->length, | |
930 | ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); | |
931 | req->mapped = 1; | |
932 | } | |
933 | ||
934 | #if 0 | |
935 | VDEBUG (dev, "%s queue req %p, len %d buf %p\n", | |
936 | _ep->name, _req, _req->length, _req->buf); | |
937 | #endif | |
938 | ||
939 | spin_lock_irqsave (&dev->lock, flags); | |
940 | ||
941 | _req->status = -EINPROGRESS; | |
942 | _req->actual = 0; | |
943 | ||
944 | /* kickstart this i/o queue? */ | |
945 | if (list_empty (&ep->queue) && !ep->stopped) { | |
946 | /* use DMA if the endpoint supports it, else pio */ | |
947 | if (ep->dma) | |
948 | start_dma (ep, req); | |
949 | else { | |
950 | /* maybe there's no control data, just status ack */ | |
951 | if (ep->num == 0 && _req->length == 0) { | |
952 | allow_status (ep); | |
953 | done (ep, req, 0); | |
954 | VDEBUG (dev, "%s status ack\n", ep->ep.name); | |
955 | goto done; | |
956 | } | |
957 | ||
958 | /* PIO ... stuff the fifo, or unblock it. */ | |
959 | if (ep->is_in) | |
960 | write_fifo (ep, _req); | |
961 | else if (list_empty (&ep->queue)) { | |
962 | u32 s; | |
963 | ||
964 | /* OUT FIFO might have packet(s) buffered */ | |
965 | s = readl (&ep->regs->ep_stat); | |
966 | if ((s & (1 << FIFO_EMPTY)) == 0) { | |
967 | /* note: _req->short_not_ok is | |
968 | * ignored here since PIO _always_ | |
969 | * stops queue advance here, and | |
970 | * _req->status doesn't change for | |
971 | * short reads (only _req->actual) | |
972 | */ | |
973 | if (read_fifo (ep, req)) { | |
974 | done (ep, req, 0); | |
975 | if (ep->num == 0) | |
976 | allow_status (ep); | |
977 | /* don't queue it */ | |
978 | req = NULL; | |
979 | } else | |
980 | s = readl (&ep->regs->ep_stat); | |
981 | } | |
982 | ||
983 | /* don't NAK, let the fifo fill */ | |
984 | if (req && (s & (1 << NAK_OUT_PACKETS))) | |
985 | writel ((1 << CLEAR_NAK_OUT_PACKETS), | |
986 | &ep->regs->ep_rsp); | |
987 | } | |
988 | } | |
989 | ||
990 | } else if (ep->dma) { | |
991 | int valid = 1; | |
992 | ||
993 | if (ep->is_in) { | |
994 | int expect; | |
995 | ||
996 | /* preventing magic zlps is per-engine state, not | |
997 | * per-transfer; irq logic must recover hiccups. | |
998 | */ | |
999 | expect = likely (req->req.zero | |
1000 | || (req->req.length % ep->ep.maxpacket) != 0); | |
1001 | if (expect != ep->in_fifo_validate) | |
1002 | valid = 0; | |
1003 | } | |
1004 | queue_dma (ep, req, valid); | |
1005 | ||
1006 | } /* else the irq handler advances the queue. */ | |
1007 | ||
1008 | if (req) | |
1009 | list_add_tail (&req->queue, &ep->queue); | |
1010 | done: | |
1011 | spin_unlock_irqrestore (&dev->lock, flags); | |
1012 | ||
1013 | /* pci writes may still be posted */ | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | static inline void | |
1018 | dma_done ( | |
1019 | struct net2280_ep *ep, | |
1020 | struct net2280_request *req, | |
1021 | u32 dmacount, | |
1022 | int status | |
1023 | ) | |
1024 | { | |
1025 | req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount); | |
1026 | done (ep, req, status); | |
1027 | } | |
1028 | ||
1029 | static void restart_dma (struct net2280_ep *ep); | |
1030 | ||
1031 | static void scan_dma_completions (struct net2280_ep *ep) | |
1032 | { | |
1033 | /* only look at descriptors that were "naturally" retired, | |
1034 | * so fifo and list head state won't matter | |
1035 | */ | |
1036 | while (!list_empty (&ep->queue)) { | |
1037 | struct net2280_request *req; | |
1038 | u32 tmp; | |
1039 | ||
1040 | req = list_entry (ep->queue.next, | |
1041 | struct net2280_request, queue); | |
1042 | if (!req->valid) | |
1043 | break; | |
1044 | rmb (); | |
1045 | tmp = le32_to_cpup (&req->td->dmacount); | |
1046 | if ((tmp & (1 << VALID_BIT)) != 0) | |
1047 | break; | |
1048 | ||
1049 | /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short" | |
1050 | * cases where DMA must be aborted; this code handles | |
1051 | * all non-abort DMA completions. | |
1052 | */ | |
1053 | if (unlikely (req->td->dmadesc == 0)) { | |
1054 | /* paranoia */ | |
1055 | tmp = readl (&ep->dma->dmacount); | |
1056 | if (tmp & DMA_BYTE_COUNT_MASK) | |
1057 | break; | |
1058 | /* single transfer mode */ | |
1059 | dma_done (ep, req, tmp, 0); | |
1060 | break; | |
1061 | } else if (!ep->is_in | |
1062 | && (req->req.length % ep->ep.maxpacket) != 0) { | |
1063 | tmp = readl (&ep->regs->ep_stat); | |
1064 | ||
1065 | /* AVOID TROUBLE HERE by not issuing short reads from | |
1066 | * your gadget driver. That helps avoids errata 0121, | |
1067 | * 0122, and 0124; not all cases trigger the warning. | |
1068 | */ | |
1069 | if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) { | |
1070 | WARN (ep->dev, "%s lost packet sync!\n", | |
1071 | ep->ep.name); | |
1072 | req->req.status = -EOVERFLOW; | |
1073 | } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) { | |
1074 | /* fifo gets flushed later */ | |
1075 | ep->out_overflow = 1; | |
1076 | DEBUG (ep->dev, "%s dma, discard %d len %d\n", | |
1077 | ep->ep.name, tmp, | |
1078 | req->req.length); | |
1079 | req->req.status = -EOVERFLOW; | |
1080 | } | |
1081 | } | |
1082 | dma_done (ep, req, tmp, 0); | |
1083 | } | |
1084 | } | |
1085 | ||
1086 | static void restart_dma (struct net2280_ep *ep) | |
1087 | { | |
1088 | struct net2280_request *req; | |
1089 | u32 dmactl = dmactl_default; | |
1090 | ||
1091 | if (ep->stopped) | |
1092 | return; | |
1093 | req = list_entry (ep->queue.next, struct net2280_request, queue); | |
1094 | ||
1095 | if (!use_dma_chaining) { | |
1096 | start_dma (ep, req); | |
1097 | return; | |
1098 | } | |
1099 | ||
1100 | /* the 2280 will be processing the queue unless queue hiccups after | |
1101 | * the previous transfer: | |
1102 | * IN: wanted automagic zlp, head doesn't (or vice versa) | |
1103 | * DMA_FIFO_VALIDATE doesn't init from dma descriptors. | |
1104 | * OUT: was "usb-short", we must restart. | |
1105 | */ | |
1106 | if (ep->is_in && !req->valid) { | |
1107 | struct net2280_request *entry, *prev = NULL; | |
1108 | int reqmode, done = 0; | |
1109 | ||
1110 | DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td); | |
1111 | ep->in_fifo_validate = likely (req->req.zero | |
1112 | || (req->req.length % ep->ep.maxpacket) != 0); | |
1113 | if (ep->in_fifo_validate) | |
1114 | dmactl |= (1 << DMA_FIFO_VALIDATE); | |
1115 | list_for_each_entry (entry, &ep->queue, queue) { | |
1116 | u32 dmacount; | |
1117 | ||
1118 | if (entry == req) | |
1119 | continue; | |
1120 | dmacount = entry->td->dmacount; | |
1121 | if (!done) { | |
1122 | reqmode = likely (entry->req.zero | |
1123 | || (entry->req.length | |
1124 | % ep->ep.maxpacket) != 0); | |
1125 | if (reqmode == ep->in_fifo_validate) { | |
1126 | entry->valid = 1; | |
1127 | dmacount |= valid_bit; | |
1128 | entry->td->dmacount = dmacount; | |
1129 | prev = entry; | |
1130 | continue; | |
1131 | } else { | |
1132 | /* force a hiccup */ | |
1133 | prev->td->dmacount |= dma_done_ie; | |
1134 | done = 1; | |
1135 | } | |
1136 | } | |
1137 | ||
1138 | /* walk the rest of the queue so unlinks behave */ | |
1139 | entry->valid = 0; | |
1140 | dmacount &= ~valid_bit; | |
1141 | entry->td->dmacount = dmacount; | |
1142 | prev = entry; | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | writel (0, &ep->dma->dmactl); | |
1147 | start_queue (ep, dmactl, req->td_dma); | |
1148 | } | |
1149 | ||
1150 | static void abort_dma (struct net2280_ep *ep) | |
1151 | { | |
1152 | /* abort the current transfer */ | |
1153 | if (likely (!list_empty (&ep->queue))) { | |
1154 | /* FIXME work around errata 0121, 0122, 0124 */ | |
1155 | writel ((1 << DMA_ABORT), &ep->dma->dmastat); | |
1156 | spin_stop_dma (ep->dma); | |
1157 | } else | |
1158 | stop_dma (ep->dma); | |
1159 | scan_dma_completions (ep); | |
1160 | } | |
1161 | ||
1162 | /* dequeue ALL requests */ | |
1163 | static void nuke (struct net2280_ep *ep) | |
1164 | { | |
1165 | struct net2280_request *req; | |
1166 | ||
1167 | /* called with spinlock held */ | |
1168 | ep->stopped = 1; | |
1169 | if (ep->dma) | |
1170 | abort_dma (ep); | |
1171 | while (!list_empty (&ep->queue)) { | |
1172 | req = list_entry (ep->queue.next, | |
1173 | struct net2280_request, | |
1174 | queue); | |
1175 | done (ep, req, -ESHUTDOWN); | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | /* dequeue JUST ONE request */ | |
1180 | static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req) | |
1181 | { | |
1182 | struct net2280_ep *ep; | |
1183 | struct net2280_request *req; | |
1184 | unsigned long flags; | |
1185 | u32 dmactl; | |
1186 | int stopped; | |
1187 | ||
1188 | ep = container_of (_ep, struct net2280_ep, ep); | |
1189 | if (!_ep || (!ep->desc && ep->num != 0) || !_req) | |
1190 | return -EINVAL; | |
1191 | ||
1192 | spin_lock_irqsave (&ep->dev->lock, flags); | |
1193 | stopped = ep->stopped; | |
1194 | ||
1195 | /* quiesce dma while we patch the queue */ | |
1196 | dmactl = 0; | |
1197 | ep->stopped = 1; | |
1198 | if (ep->dma) { | |
1199 | dmactl = readl (&ep->dma->dmactl); | |
1200 | /* WARNING erratum 0127 may kick in ... */ | |
1201 | stop_dma (ep->dma); | |
1202 | scan_dma_completions (ep); | |
1203 | } | |
1204 | ||
1205 | /* make sure it's still queued on this endpoint */ | |
1206 | list_for_each_entry (req, &ep->queue, queue) { | |
1207 | if (&req->req == _req) | |
1208 | break; | |
1209 | } | |
1210 | if (&req->req != _req) { | |
1211 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
1212 | return -EINVAL; | |
1213 | } | |
1214 | ||
1215 | /* queue head may be partially complete. */ | |
1216 | if (ep->queue.next == &req->queue) { | |
1217 | if (ep->dma) { | |
1218 | DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name); | |
1219 | _req->status = -ECONNRESET; | |
1220 | abort_dma (ep); | |
1221 | if (likely (ep->queue.next == &req->queue)) { | |
1222 | // NOTE: misreports single-transfer mode | |
1223 | req->td->dmacount = 0; /* invalidate */ | |
1224 | dma_done (ep, req, | |
1225 | readl (&ep->dma->dmacount), | |
1226 | -ECONNRESET); | |
1227 | } | |
1228 | } else { | |
1229 | DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name); | |
1230 | done (ep, req, -ECONNRESET); | |
1231 | } | |
1232 | req = NULL; | |
1233 | ||
1234 | /* patch up hardware chaining data */ | |
1235 | } else if (ep->dma && use_dma_chaining) { | |
1236 | if (req->queue.prev == ep->queue.next) { | |
1237 | writel (le32_to_cpu (req->td->dmadesc), | |
1238 | &ep->dma->dmadesc); | |
1239 | if (req->td->dmacount & dma_done_ie) | |
1240 | writel (readl (&ep->dma->dmacount) | |
1241 | | dma_done_ie, | |
1242 | &ep->dma->dmacount); | |
1243 | } else { | |
1244 | struct net2280_request *prev; | |
1245 | ||
1246 | prev = list_entry (req->queue.prev, | |
1247 | struct net2280_request, queue); | |
1248 | prev->td->dmadesc = req->td->dmadesc; | |
1249 | if (req->td->dmacount & dma_done_ie) | |
1250 | prev->td->dmacount |= dma_done_ie; | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | if (req) | |
1255 | done (ep, req, -ECONNRESET); | |
1256 | ep->stopped = stopped; | |
1257 | ||
1258 | if (ep->dma) { | |
1259 | /* turn off dma on inactive queues */ | |
1260 | if (list_empty (&ep->queue)) | |
1261 | stop_dma (ep->dma); | |
1262 | else if (!ep->stopped) { | |
1263 | /* resume current request, or start new one */ | |
1264 | if (req) | |
1265 | writel (dmactl, &ep->dma->dmactl); | |
1266 | else | |
1267 | start_dma (ep, list_entry (ep->queue.next, | |
1268 | struct net2280_request, queue)); | |
1269 | } | |
1270 | } | |
1271 | ||
1272 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | /*-------------------------------------------------------------------------*/ | |
1277 | ||
1278 | static int net2280_fifo_status (struct usb_ep *_ep); | |
1279 | ||
1280 | static int | |
1281 | net2280_set_halt (struct usb_ep *_ep, int value) | |
1282 | { | |
1283 | struct net2280_ep *ep; | |
1284 | unsigned long flags; | |
1285 | int retval = 0; | |
1286 | ||
1287 | ep = container_of (_ep, struct net2280_ep, ep); | |
1288 | if (!_ep || (!ep->desc && ep->num != 0)) | |
1289 | return -EINVAL; | |
1290 | if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1291 | return -ESHUTDOWN; | |
1292 | if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03) | |
1293 | == USB_ENDPOINT_XFER_ISOC) | |
1294 | return -EINVAL; | |
1295 | ||
1296 | spin_lock_irqsave (&ep->dev->lock, flags); | |
1297 | if (!list_empty (&ep->queue)) | |
1298 | retval = -EAGAIN; | |
1299 | else if (ep->is_in && value && net2280_fifo_status (_ep) != 0) | |
1300 | retval = -EAGAIN; | |
1301 | else { | |
1302 | VDEBUG (ep->dev, "%s %s halt\n", _ep->name, | |
1303 | value ? "set" : "clear"); | |
1304 | /* set/clear, then synch memory views with the device */ | |
1305 | if (value) { | |
1306 | if (ep->num == 0) | |
1307 | ep->dev->protocol_stall = 1; | |
1308 | else | |
1309 | set_halt (ep); | |
1310 | } else | |
1311 | clear_halt (ep); | |
1312 | (void) readl (&ep->regs->ep_rsp); | |
1313 | } | |
1314 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
1315 | ||
1316 | return retval; | |
1317 | } | |
1318 | ||
1319 | static int | |
1320 | net2280_fifo_status (struct usb_ep *_ep) | |
1321 | { | |
1322 | struct net2280_ep *ep; | |
1323 | u32 avail; | |
1324 | ||
1325 | ep = container_of (_ep, struct net2280_ep, ep); | |
1326 | if (!_ep || (!ep->desc && ep->num != 0)) | |
1327 | return -ENODEV; | |
1328 | if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1329 | return -ESHUTDOWN; | |
1330 | ||
1331 | avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1); | |
1332 | if (avail > ep->fifo_size) | |
1333 | return -EOVERFLOW; | |
1334 | if (ep->is_in) | |
1335 | avail = ep->fifo_size - avail; | |
1336 | return avail; | |
1337 | } | |
1338 | ||
1339 | static void | |
1340 | net2280_fifo_flush (struct usb_ep *_ep) | |
1341 | { | |
1342 | struct net2280_ep *ep; | |
1343 | ||
1344 | ep = container_of (_ep, struct net2280_ep, ep); | |
1345 | if (!_ep || (!ep->desc && ep->num != 0)) | |
1346 | return; | |
1347 | if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1348 | return; | |
1349 | ||
1350 | writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat); | |
1351 | (void) readl (&ep->regs->ep_rsp); | |
1352 | } | |
1353 | ||
1354 | static struct usb_ep_ops net2280_ep_ops = { | |
1355 | .enable = net2280_enable, | |
1356 | .disable = net2280_disable, | |
1357 | ||
1358 | .alloc_request = net2280_alloc_request, | |
1359 | .free_request = net2280_free_request, | |
1360 | ||
1361 | .alloc_buffer = net2280_alloc_buffer, | |
1362 | .free_buffer = net2280_free_buffer, | |
1363 | ||
1364 | .queue = net2280_queue, | |
1365 | .dequeue = net2280_dequeue, | |
1366 | ||
1367 | .set_halt = net2280_set_halt, | |
1368 | .fifo_status = net2280_fifo_status, | |
1369 | .fifo_flush = net2280_fifo_flush, | |
1370 | }; | |
1371 | ||
1372 | /*-------------------------------------------------------------------------*/ | |
1373 | ||
1374 | static int net2280_get_frame (struct usb_gadget *_gadget) | |
1375 | { | |
1376 | struct net2280 *dev; | |
1377 | unsigned long flags; | |
1378 | u16 retval; | |
1379 | ||
1380 | if (!_gadget) | |
1381 | return -ENODEV; | |
1382 | dev = container_of (_gadget, struct net2280, gadget); | |
1383 | spin_lock_irqsave (&dev->lock, flags); | |
1384 | retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff; | |
1385 | spin_unlock_irqrestore (&dev->lock, flags); | |
1386 | return retval; | |
1387 | } | |
1388 | ||
1389 | static int net2280_wakeup (struct usb_gadget *_gadget) | |
1390 | { | |
1391 | struct net2280 *dev; | |
1392 | u32 tmp; | |
1393 | unsigned long flags; | |
1394 | ||
1395 | if (!_gadget) | |
1396 | return 0; | |
1397 | dev = container_of (_gadget, struct net2280, gadget); | |
1398 | ||
1399 | spin_lock_irqsave (&dev->lock, flags); | |
1400 | tmp = readl (&dev->usb->usbctl); | |
1401 | if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE)) | |
1402 | writel (1 << GENERATE_RESUME, &dev->usb->usbstat); | |
1403 | spin_unlock_irqrestore (&dev->lock, flags); | |
1404 | ||
1405 | /* pci writes may still be posted */ | |
1406 | return 0; | |
1407 | } | |
1408 | ||
1409 | static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value) | |
1410 | { | |
1411 | struct net2280 *dev; | |
1412 | u32 tmp; | |
1413 | unsigned long flags; | |
1414 | ||
1415 | if (!_gadget) | |
1416 | return 0; | |
1417 | dev = container_of (_gadget, struct net2280, gadget); | |
1418 | ||
1419 | spin_lock_irqsave (&dev->lock, flags); | |
1420 | tmp = readl (&dev->usb->usbctl); | |
1421 | if (value) | |
1422 | tmp |= (1 << SELF_POWERED_STATUS); | |
1423 | else | |
1424 | tmp &= ~(1 << SELF_POWERED_STATUS); | |
1425 | writel (tmp, &dev->usb->usbctl); | |
1426 | spin_unlock_irqrestore (&dev->lock, flags); | |
1427 | ||
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | static int net2280_pullup(struct usb_gadget *_gadget, int is_on) | |
1432 | { | |
1433 | struct net2280 *dev; | |
1434 | u32 tmp; | |
1435 | unsigned long flags; | |
1436 | ||
1437 | if (!_gadget) | |
1438 | return -ENODEV; | |
1439 | dev = container_of (_gadget, struct net2280, gadget); | |
1440 | ||
1441 | spin_lock_irqsave (&dev->lock, flags); | |
1442 | tmp = readl (&dev->usb->usbctl); | |
1443 | dev->softconnect = (is_on != 0); | |
1444 | if (is_on) | |
1445 | tmp |= (1 << USB_DETECT_ENABLE); | |
1446 | else | |
1447 | tmp &= ~(1 << USB_DETECT_ENABLE); | |
1448 | writel (tmp, &dev->usb->usbctl); | |
1449 | spin_unlock_irqrestore (&dev->lock, flags); | |
1450 | ||
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | static const struct usb_gadget_ops net2280_ops = { | |
1455 | .get_frame = net2280_get_frame, | |
1456 | .wakeup = net2280_wakeup, | |
1457 | .set_selfpowered = net2280_set_selfpowered, | |
1458 | .pullup = net2280_pullup, | |
1459 | }; | |
1460 | ||
1461 | /*-------------------------------------------------------------------------*/ | |
1462 | ||
1463 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES | |
1464 | ||
1465 | /* FIXME move these into procfs, and use seq_file. | |
1466 | * Sysfs _still_ doesn't behave for arbitrarily sized files, | |
1467 | * and also doesn't help products using this with 2.4 kernels. | |
1468 | */ | |
1469 | ||
1470 | /* "function" sysfs attribute */ | |
1471 | static ssize_t | |
1472 | show_function (struct device *_dev, char *buf) | |
1473 | { | |
1474 | struct net2280 *dev = dev_get_drvdata (_dev); | |
1475 | ||
1476 | if (!dev->driver | |
1477 | || !dev->driver->function | |
1478 | || strlen (dev->driver->function) > PAGE_SIZE) | |
1479 | return 0; | |
1480 | return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function); | |
1481 | } | |
1482 | static DEVICE_ATTR (function, S_IRUGO, show_function, NULL); | |
1483 | ||
1484 | static ssize_t | |
1485 | show_registers (struct device *_dev, char *buf) | |
1486 | { | |
1487 | struct net2280 *dev; | |
1488 | char *next; | |
1489 | unsigned size, t; | |
1490 | unsigned long flags; | |
1491 | int i; | |
1492 | u32 t1, t2; | |
1493 | char *s; | |
1494 | ||
1495 | dev = dev_get_drvdata (_dev); | |
1496 | next = buf; | |
1497 | size = PAGE_SIZE; | |
1498 | spin_lock_irqsave (&dev->lock, flags); | |
1499 | ||
1500 | if (dev->driver) | |
1501 | s = dev->driver->driver.name; | |
1502 | else | |
1503 | s = "(none)"; | |
1504 | ||
1505 | /* Main Control Registers */ | |
1506 | t = scnprintf (next, size, "%s version " DRIVER_VERSION | |
1507 | ", chiprev %04x, dma %s\n\n" | |
1508 | "devinit %03x fifoctl %08x gadget '%s'\n" | |
1509 | "pci irqenb0 %02x irqenb1 %08x " | |
1510 | "irqstat0 %04x irqstat1 %08x\n", | |
1511 | driver_name, dev->chiprev, | |
1512 | use_dma | |
1513 | ? (use_dma_chaining ? "chaining" : "enabled") | |
1514 | : "disabled", | |
1515 | readl (&dev->regs->devinit), | |
1516 | readl (&dev->regs->fifoctl), | |
1517 | s, | |
1518 | readl (&dev->regs->pciirqenb0), | |
1519 | readl (&dev->regs->pciirqenb1), | |
1520 | readl (&dev->regs->irqstat0), | |
1521 | readl (&dev->regs->irqstat1)); | |
1522 | size -= t; | |
1523 | next += t; | |
1524 | ||
1525 | /* USB Control Registers */ | |
1526 | t1 = readl (&dev->usb->usbctl); | |
1527 | t2 = readl (&dev->usb->usbstat); | |
1528 | if (t1 & (1 << VBUS_PIN)) { | |
1529 | if (t2 & (1 << HIGH_SPEED)) | |
1530 | s = "high speed"; | |
1531 | else if (dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1532 | s = "powered"; | |
1533 | else | |
1534 | s = "full speed"; | |
1535 | /* full speed bit (6) not working?? */ | |
1536 | } else | |
1537 | s = "not attached"; | |
1538 | t = scnprintf (next, size, | |
1539 | "stdrsp %08x usbctl %08x usbstat %08x " | |
1540 | "addr 0x%02x (%s)\n", | |
1541 | readl (&dev->usb->stdrsp), t1, t2, | |
1542 | readl (&dev->usb->ouraddr), s); | |
1543 | size -= t; | |
1544 | next += t; | |
1545 | ||
1546 | /* PCI Master Control Registers */ | |
1547 | ||
1548 | /* DMA Control Registers */ | |
1549 | ||
1550 | /* Configurable EP Control Registers */ | |
1551 | for (i = 0; i < 7; i++) { | |
1552 | struct net2280_ep *ep; | |
1553 | ||
1554 | ep = &dev->ep [i]; | |
1555 | if (i && !ep->desc) | |
1556 | continue; | |
1557 | ||
1558 | t1 = readl (&ep->regs->ep_cfg); | |
1559 | t2 = readl (&ep->regs->ep_rsp) & 0xff; | |
1560 | t = scnprintf (next, size, | |
1561 | "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s" | |
1562 | "irqenb %02x\n", | |
1563 | ep->ep.name, t1, t2, | |
1564 | (t2 & (1 << CLEAR_NAK_OUT_PACKETS)) | |
1565 | ? "NAK " : "", | |
1566 | (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE)) | |
1567 | ? "hide " : "", | |
1568 | (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR)) | |
1569 | ? "CRC " : "", | |
1570 | (t2 & (1 << CLEAR_INTERRUPT_MODE)) | |
1571 | ? "interrupt " : "", | |
1572 | (t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)) | |
1573 | ? "status " : "", | |
1574 | (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE)) | |
1575 | ? "NAKmode " : "", | |
1576 | (t2 & (1 << CLEAR_ENDPOINT_TOGGLE)) | |
1577 | ? "DATA1 " : "DATA0 ", | |
1578 | (t2 & (1 << CLEAR_ENDPOINT_HALT)) | |
1579 | ? "HALT " : "", | |
1580 | readl (&ep->regs->ep_irqenb)); | |
1581 | size -= t; | |
1582 | next += t; | |
1583 | ||
1584 | t = scnprintf (next, size, | |
1585 | "\tstat %08x avail %04x " | |
1586 | "(ep%d%s-%s)%s\n", | |
1587 | readl (&ep->regs->ep_stat), | |
1588 | readl (&ep->regs->ep_avail), | |
1589 | t1 & 0x0f, DIR_STRING (t1), | |
1590 | type_string (t1 >> 8), | |
1591 | ep->stopped ? "*" : ""); | |
1592 | size -= t; | |
1593 | next += t; | |
1594 | ||
1595 | if (!ep->dma) | |
1596 | continue; | |
1597 | ||
1598 | t = scnprintf (next, size, | |
1599 | " dma\tctl %08x stat %08x count %08x\n" | |
1600 | "\taddr %08x desc %08x\n", | |
1601 | readl (&ep->dma->dmactl), | |
1602 | readl (&ep->dma->dmastat), | |
1603 | readl (&ep->dma->dmacount), | |
1604 | readl (&ep->dma->dmaaddr), | |
1605 | readl (&ep->dma->dmadesc)); | |
1606 | size -= t; | |
1607 | next += t; | |
1608 | ||
1609 | } | |
1610 | ||
1611 | /* Indexed Registers */ | |
1612 | // none yet | |
1613 | ||
1614 | /* Statistics */ | |
1615 | t = scnprintf (next, size, "\nirqs: "); | |
1616 | size -= t; | |
1617 | next += t; | |
1618 | for (i = 0; i < 7; i++) { | |
1619 | struct net2280_ep *ep; | |
1620 | ||
1621 | ep = &dev->ep [i]; | |
1622 | if (i && !ep->irqs) | |
1623 | continue; | |
1624 | t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs); | |
1625 | size -= t; | |
1626 | next += t; | |
1627 | ||
1628 | } | |
1629 | t = scnprintf (next, size, "\n"); | |
1630 | size -= t; | |
1631 | next += t; | |
1632 | ||
1633 | spin_unlock_irqrestore (&dev->lock, flags); | |
1634 | ||
1635 | return PAGE_SIZE - size; | |
1636 | } | |
1637 | static DEVICE_ATTR (registers, S_IRUGO, show_registers, NULL); | |
1638 | ||
1639 | static ssize_t | |
1640 | show_queues (struct device *_dev, char *buf) | |
1641 | { | |
1642 | struct net2280 *dev; | |
1643 | char *next; | |
1644 | unsigned size; | |
1645 | unsigned long flags; | |
1646 | int i; | |
1647 | ||
1648 | dev = dev_get_drvdata (_dev); | |
1649 | next = buf; | |
1650 | size = PAGE_SIZE; | |
1651 | spin_lock_irqsave (&dev->lock, flags); | |
1652 | ||
1653 | for (i = 0; i < 7; i++) { | |
1654 | struct net2280_ep *ep = &dev->ep [i]; | |
1655 | struct net2280_request *req; | |
1656 | int t; | |
1657 | ||
1658 | if (i != 0) { | |
1659 | const struct usb_endpoint_descriptor *d; | |
1660 | ||
1661 | d = ep->desc; | |
1662 | if (!d) | |
1663 | continue; | |
1664 | t = d->bEndpointAddress; | |
1665 | t = scnprintf (next, size, | |
1666 | "\n%s (ep%d%s-%s) max %04x %s fifo %d\n", | |
1667 | ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK, | |
1668 | (t & USB_DIR_IN) ? "in" : "out", | |
1669 | ({ char *val; | |
1670 | switch (d->bmAttributes & 0x03) { | |
1671 | case USB_ENDPOINT_XFER_BULK: | |
1672 | val = "bulk"; break; | |
1673 | case USB_ENDPOINT_XFER_INT: | |
1674 | val = "intr"; break; | |
1675 | default: | |
1676 | val = "iso"; break; | |
1677 | }; val; }), | |
1678 | le16_to_cpu (d->wMaxPacketSize) & 0x1fff, | |
1679 | ep->dma ? "dma" : "pio", ep->fifo_size | |
1680 | ); | |
1681 | } else /* ep0 should only have one transfer queued */ | |
1682 | t = scnprintf (next, size, "ep0 max 64 pio %s\n", | |
1683 | ep->is_in ? "in" : "out"); | |
1684 | if (t <= 0 || t > size) | |
1685 | goto done; | |
1686 | size -= t; | |
1687 | next += t; | |
1688 | ||
1689 | if (list_empty (&ep->queue)) { | |
1690 | t = scnprintf (next, size, "\t(nothing queued)\n"); | |
1691 | if (t <= 0 || t > size) | |
1692 | goto done; | |
1693 | size -= t; | |
1694 | next += t; | |
1695 | continue; | |
1696 | } | |
1697 | list_for_each_entry (req, &ep->queue, queue) { | |
1698 | if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc)) | |
1699 | t = scnprintf (next, size, | |
1700 | "\treq %p len %d/%d " | |
1701 | "buf %p (dmacount %08x)\n", | |
1702 | &req->req, req->req.actual, | |
1703 | req->req.length, req->req.buf, | |
1704 | readl (&ep->dma->dmacount)); | |
1705 | else | |
1706 | t = scnprintf (next, size, | |
1707 | "\treq %p len %d/%d buf %p\n", | |
1708 | &req->req, req->req.actual, | |
1709 | req->req.length, req->req.buf); | |
1710 | if (t <= 0 || t > size) | |
1711 | goto done; | |
1712 | size -= t; | |
1713 | next += t; | |
1714 | ||
1715 | if (ep->dma) { | |
1716 | struct net2280_dma *td; | |
1717 | ||
1718 | td = req->td; | |
1719 | t = scnprintf (next, size, "\t td %08x " | |
1720 | " count %08x buf %08x desc %08x\n", | |
1721 | (u32) req->td_dma, | |
1722 | le32_to_cpu (td->dmacount), | |
1723 | le32_to_cpu (td->dmaaddr), | |
1724 | le32_to_cpu (td->dmadesc)); | |
1725 | if (t <= 0 || t > size) | |
1726 | goto done; | |
1727 | size -= t; | |
1728 | next += t; | |
1729 | } | |
1730 | } | |
1731 | } | |
1732 | ||
1733 | done: | |
1734 | spin_unlock_irqrestore (&dev->lock, flags); | |
1735 | return PAGE_SIZE - size; | |
1736 | } | |
1737 | static DEVICE_ATTR (queues, S_IRUGO, show_queues, NULL); | |
1738 | ||
1739 | ||
1740 | #else | |
1741 | ||
1742 | #define device_create_file(a,b) do {} while (0) | |
1743 | #define device_remove_file device_create_file | |
1744 | ||
1745 | #endif | |
1746 | ||
1747 | /*-------------------------------------------------------------------------*/ | |
1748 | ||
1749 | /* another driver-specific mode might be a request type doing dma | |
1750 | * to/from another device fifo instead of to/from memory. | |
1751 | */ | |
1752 | ||
1753 | static void set_fifo_mode (struct net2280 *dev, int mode) | |
1754 | { | |
1755 | /* keeping high bits preserves BAR2 */ | |
1756 | writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl); | |
1757 | ||
1758 | /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */ | |
1759 | INIT_LIST_HEAD (&dev->gadget.ep_list); | |
1760 | list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list); | |
1761 | list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list); | |
1762 | switch (mode) { | |
1763 | case 0: | |
1764 | list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list); | |
1765 | list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list); | |
1766 | dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024; | |
1767 | break; | |
1768 | case 1: | |
1769 | dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048; | |
1770 | break; | |
1771 | case 2: | |
1772 | list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list); | |
1773 | dev->ep [1].fifo_size = 2048; | |
1774 | dev->ep [2].fifo_size = 1024; | |
1775 | break; | |
1776 | } | |
1777 | /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */ | |
1778 | list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list); | |
1779 | list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list); | |
1780 | } | |
1781 | ||
1782 | /** | |
1783 | * net2280_set_fifo_mode - change allocation of fifo buffers | |
1784 | * @gadget: access to the net2280 device that will be updated | |
1785 | * @mode: 0 for default, four 1kB buffers (ep-a through ep-d); | |
1786 | * 1 for two 2kB buffers (ep-a and ep-b only); | |
1787 | * 2 for one 2kB buffer (ep-a) and two 1kB ones (ep-b, ep-c). | |
1788 | * | |
1789 | * returns zero on success, else negative errno. when this succeeds, | |
1790 | * the contents of gadget->ep_list may have changed. | |
1791 | * | |
1792 | * you may only call this function when endpoints a-d are all disabled. | |
1793 | * use it whenever extra hardware buffering can help performance, such | |
1794 | * as before enabling "high bandwidth" interrupt endpoints that use | |
1795 | * maxpacket bigger than 512 (when double buffering would otherwise | |
1796 | * be unavailable). | |
1797 | */ | |
1798 | int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode) | |
1799 | { | |
1800 | int i; | |
1801 | struct net2280 *dev; | |
1802 | int status = 0; | |
1803 | unsigned long flags; | |
1804 | ||
1805 | if (!gadget) | |
1806 | return -ENODEV; | |
1807 | dev = container_of (gadget, struct net2280, gadget); | |
1808 | ||
1809 | spin_lock_irqsave (&dev->lock, flags); | |
1810 | ||
1811 | for (i = 1; i <= 4; i++) | |
1812 | if (dev->ep [i].desc) { | |
1813 | status = -EINVAL; | |
1814 | break; | |
1815 | } | |
1816 | if (mode < 0 || mode > 2) | |
1817 | status = -EINVAL; | |
1818 | if (status == 0) | |
1819 | set_fifo_mode (dev, mode); | |
1820 | spin_unlock_irqrestore (&dev->lock, flags); | |
1821 | ||
1822 | if (status == 0) { | |
1823 | if (mode == 1) | |
1824 | DEBUG (dev, "fifo: ep-a 2K, ep-b 2K\n"); | |
1825 | else if (mode == 2) | |
1826 | DEBUG (dev, "fifo: ep-a 2K, ep-b 1K, ep-c 1K\n"); | |
1827 | /* else all are 1K */ | |
1828 | } | |
1829 | return status; | |
1830 | } | |
1831 | EXPORT_SYMBOL (net2280_set_fifo_mode); | |
1832 | ||
1833 | /*-------------------------------------------------------------------------*/ | |
1834 | ||
1835 | /* keeping it simple: | |
1836 | * - one bus driver, initted first; | |
1837 | * - one function driver, initted second | |
1838 | * | |
1839 | * most of the work to support multiple net2280 controllers would | |
1840 | * be to associate this gadget driver (yes?) with all of them, or | |
1841 | * perhaps to bind specific drivers to specific devices. | |
1842 | */ | |
1843 | ||
1844 | static struct net2280 *the_controller; | |
1845 | ||
1846 | static void usb_reset (struct net2280 *dev) | |
1847 | { | |
1848 | u32 tmp; | |
1849 | ||
1850 | dev->gadget.speed = USB_SPEED_UNKNOWN; | |
1851 | (void) readl (&dev->usb->usbctl); | |
1852 | ||
1853 | net2280_led_init (dev); | |
1854 | ||
1855 | /* disable automatic responses, and irqs */ | |
1856 | writel (0, &dev->usb->stdrsp); | |
1857 | writel (0, &dev->regs->pciirqenb0); | |
1858 | writel (0, &dev->regs->pciirqenb1); | |
1859 | ||
1860 | /* clear old dma and irq state */ | |
1861 | for (tmp = 0; tmp < 4; tmp++) { | |
1862 | struct net2280_ep *ep = &dev->ep [tmp + 1]; | |
1863 | ||
1864 | if (ep->dma) | |
1865 | abort_dma (ep); | |
1866 | } | |
1867 | writel (~0, &dev->regs->irqstat0), | |
1868 | writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1), | |
1869 | ||
1870 | /* reset, and enable pci */ | |
1871 | tmp = readl (&dev->regs->devinit) | |
1872 | | (1 << PCI_ENABLE) | |
1873 | | (1 << FIFO_SOFT_RESET) | |
1874 | | (1 << USB_SOFT_RESET) | |
1875 | | (1 << M8051_RESET); | |
1876 | writel (tmp, &dev->regs->devinit); | |
1877 | ||
1878 | /* standard fifo and endpoint allocations */ | |
1879 | set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0); | |
1880 | } | |
1881 | ||
1882 | static void usb_reinit (struct net2280 *dev) | |
1883 | { | |
1884 | u32 tmp; | |
1885 | int init_dma; | |
1886 | ||
1887 | /* use_dma changes are ignored till next device re-init */ | |
1888 | init_dma = use_dma; | |
1889 | ||
1890 | /* basic endpoint init */ | |
1891 | for (tmp = 0; tmp < 7; tmp++) { | |
1892 | struct net2280_ep *ep = &dev->ep [tmp]; | |
1893 | ||
1894 | ep->ep.name = ep_name [tmp]; | |
1895 | ep->dev = dev; | |
1896 | ep->num = tmp; | |
1897 | ||
1898 | if (tmp > 0 && tmp <= 4) { | |
1899 | ep->fifo_size = 1024; | |
1900 | if (init_dma) | |
1901 | ep->dma = &dev->dma [tmp - 1]; | |
1902 | } else | |
1903 | ep->fifo_size = 64; | |
1904 | ep->regs = &dev->epregs [tmp]; | |
1905 | ep_reset (dev->regs, ep); | |
1906 | } | |
1907 | dev->ep [0].ep.maxpacket = 64; | |
1908 | dev->ep [5].ep.maxpacket = 64; | |
1909 | dev->ep [6].ep.maxpacket = 64; | |
1910 | ||
1911 | dev->gadget.ep0 = &dev->ep [0].ep; | |
1912 | dev->ep [0].stopped = 0; | |
1913 | INIT_LIST_HEAD (&dev->gadget.ep0->ep_list); | |
1914 | ||
1915 | /* we want to prevent lowlevel/insecure access from the USB host, | |
1916 | * but erratum 0119 means this enable bit is ignored | |
1917 | */ | |
1918 | for (tmp = 0; tmp < 5; tmp++) | |
1919 | writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg); | |
1920 | } | |
1921 | ||
1922 | static void ep0_start (struct net2280 *dev) | |
1923 | { | |
1924 | writel ( (1 << CLEAR_EP_HIDE_STATUS_PHASE) | |
1925 | | (1 << CLEAR_NAK_OUT_PACKETS) | |
1926 | | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) | |
1927 | , &dev->epregs [0].ep_rsp); | |
1928 | ||
1929 | /* | |
1930 | * hardware optionally handles a bunch of standard requests | |
1931 | * that the API hides from drivers anyway. have it do so. | |
1932 | * endpoint status/features are handled in software, to | |
1933 | * help pass tests for some dubious behavior. | |
1934 | */ | |
1935 | writel ( (1 << SET_TEST_MODE) | |
1936 | | (1 << SET_ADDRESS) | |
1937 | | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) | |
1938 | | (1 << GET_DEVICE_STATUS) | |
1939 | | (1 << GET_INTERFACE_STATUS) | |
1940 | , &dev->usb->stdrsp); | |
1941 | writel ( (1 << USB_ROOT_PORT_WAKEUP_ENABLE) | |
1942 | | (1 << SELF_POWERED_USB_DEVICE) | |
1943 | | (1 << REMOTE_WAKEUP_SUPPORT) | |
1944 | | (dev->softconnect << USB_DETECT_ENABLE) | |
1945 | | (1 << SELF_POWERED_STATUS) | |
1946 | , &dev->usb->usbctl); | |
1947 | ||
1948 | /* enable irqs so we can see ep0 and general operation */ | |
1949 | writel ( (1 << SETUP_PACKET_INTERRUPT_ENABLE) | |
1950 | | (1 << ENDPOINT_0_INTERRUPT_ENABLE) | |
1951 | , &dev->regs->pciirqenb0); | |
1952 | writel ( (1 << PCI_INTERRUPT_ENABLE) | |
1953 | | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) | |
1954 | | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) | |
1955 | | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE) | |
1956 | | (1 << VBUS_INTERRUPT_ENABLE) | |
1957 | | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE) | |
1958 | | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) | |
1959 | , &dev->regs->pciirqenb1); | |
1960 | ||
1961 | /* don't leave any writes posted */ | |
1962 | (void) readl (&dev->usb->usbctl); | |
1963 | } | |
1964 | ||
1965 | /* when a driver is successfully registered, it will receive | |
1966 | * control requests including set_configuration(), which enables | |
1967 | * non-control requests. then usb traffic follows until a | |
1968 | * disconnect is reported. then a host may connect again, or | |
1969 | * the driver might get unbound. | |
1970 | */ | |
1971 | int usb_gadget_register_driver (struct usb_gadget_driver *driver) | |
1972 | { | |
1973 | struct net2280 *dev = the_controller; | |
1974 | int retval; | |
1975 | unsigned i; | |
1976 | ||
1977 | /* insist on high speed support from the driver, since | |
1978 | * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE) | |
1979 | * "must not be used in normal operation" | |
1980 | */ | |
1981 | if (!driver | |
1982 | || driver->speed != USB_SPEED_HIGH | |
1983 | || !driver->bind | |
1984 | || !driver->unbind | |
1985 | || !driver->setup) | |
1986 | return -EINVAL; | |
1987 | if (!dev) | |
1988 | return -ENODEV; | |
1989 | if (dev->driver) | |
1990 | return -EBUSY; | |
1991 | ||
1992 | for (i = 0; i < 7; i++) | |
1993 | dev->ep [i].irqs = 0; | |
1994 | ||
1995 | /* hook up the driver ... */ | |
1996 | dev->softconnect = 1; | |
1997 | driver->driver.bus = NULL; | |
1998 | dev->driver = driver; | |
1999 | dev->gadget.dev.driver = &driver->driver; | |
2000 | retval = driver->bind (&dev->gadget); | |
2001 | if (retval) { | |
2002 | DEBUG (dev, "bind to driver %s --> %d\n", | |
2003 | driver->driver.name, retval); | |
2004 | dev->driver = NULL; | |
2005 | dev->gadget.dev.driver = NULL; | |
2006 | return retval; | |
2007 | } | |
2008 | ||
2009 | device_create_file (&dev->pdev->dev, &dev_attr_function); | |
2010 | device_create_file (&dev->pdev->dev, &dev_attr_queues); | |
2011 | ||
2012 | /* ... then enable host detection and ep0; and we're ready | |
2013 | * for set_configuration as well as eventual disconnect. | |
2014 | */ | |
2015 | net2280_led_active (dev, 1); | |
2016 | ep0_start (dev); | |
2017 | ||
2018 | DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n", | |
2019 | driver->driver.name, | |
2020 | readl (&dev->usb->usbctl), | |
2021 | readl (&dev->usb->stdrsp)); | |
2022 | ||
2023 | /* pci writes may still be posted */ | |
2024 | return 0; | |
2025 | } | |
2026 | EXPORT_SYMBOL (usb_gadget_register_driver); | |
2027 | ||
2028 | static void | |
2029 | stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver) | |
2030 | { | |
2031 | int i; | |
2032 | ||
2033 | /* don't disconnect if it's not connected */ | |
2034 | if (dev->gadget.speed == USB_SPEED_UNKNOWN) | |
2035 | driver = NULL; | |
2036 | ||
2037 | /* stop hardware; prevent new request submissions; | |
2038 | * and kill any outstanding requests. | |
2039 | */ | |
2040 | usb_reset (dev); | |
2041 | for (i = 0; i < 7; i++) | |
2042 | nuke (&dev->ep [i]); | |
2043 | ||
2044 | /* report disconnect; the driver is already quiesced */ | |
2045 | if (driver) { | |
2046 | spin_unlock (&dev->lock); | |
2047 | driver->disconnect (&dev->gadget); | |
2048 | spin_lock (&dev->lock); | |
2049 | } | |
2050 | ||
2051 | usb_reinit (dev); | |
2052 | } | |
2053 | ||
2054 | int usb_gadget_unregister_driver (struct usb_gadget_driver *driver) | |
2055 | { | |
2056 | struct net2280 *dev = the_controller; | |
2057 | unsigned long flags; | |
2058 | ||
2059 | if (!dev) | |
2060 | return -ENODEV; | |
2061 | if (!driver || driver != dev->driver) | |
2062 | return -EINVAL; | |
2063 | ||
2064 | spin_lock_irqsave (&dev->lock, flags); | |
2065 | stop_activity (dev, driver); | |
2066 | spin_unlock_irqrestore (&dev->lock, flags); | |
2067 | ||
2068 | net2280_pullup (&dev->gadget, 0); | |
2069 | ||
2070 | driver->unbind (&dev->gadget); | |
2071 | dev->gadget.dev.driver = NULL; | |
2072 | dev->driver = NULL; | |
2073 | ||
2074 | net2280_led_active (dev, 0); | |
2075 | device_remove_file (&dev->pdev->dev, &dev_attr_function); | |
2076 | device_remove_file (&dev->pdev->dev, &dev_attr_queues); | |
2077 | ||
2078 | DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name); | |
2079 | return 0; | |
2080 | } | |
2081 | EXPORT_SYMBOL (usb_gadget_unregister_driver); | |
2082 | ||
2083 | ||
2084 | /*-------------------------------------------------------------------------*/ | |
2085 | ||
2086 | /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq. | |
2087 | * also works for dma-capable endpoints, in pio mode or just | |
2088 | * to manually advance the queue after short OUT transfers. | |
2089 | */ | |
2090 | static void handle_ep_small (struct net2280_ep *ep) | |
2091 | { | |
2092 | struct net2280_request *req; | |
2093 | u32 t; | |
2094 | /* 0 error, 1 mid-data, 2 done */ | |
2095 | int mode = 1; | |
2096 | ||
2097 | if (!list_empty (&ep->queue)) | |
2098 | req = list_entry (ep->queue.next, | |
2099 | struct net2280_request, queue); | |
2100 | else | |
2101 | req = NULL; | |
2102 | ||
2103 | /* ack all, and handle what we care about */ | |
2104 | t = readl (&ep->regs->ep_stat); | |
2105 | ep->irqs++; | |
2106 | #if 0 | |
2107 | VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n", | |
2108 | ep->ep.name, t, req ? &req->req : 0); | |
2109 | #endif | |
2110 | writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat); | |
2111 | ||
2112 | /* for ep0, monitor token irqs to catch data stage length errors | |
2113 | * and to synchronize on status. | |
2114 | * | |
2115 | * also, to defer reporting of protocol stalls ... here's where | |
2116 | * data or status first appears, handling stalls here should never | |
2117 | * cause trouble on the host side.. | |
2118 | * | |
2119 | * control requests could be slightly faster without token synch for | |
2120 | * status, but status can jam up that way. | |
2121 | */ | |
2122 | if (unlikely (ep->num == 0)) { | |
2123 | if (ep->is_in) { | |
2124 | /* status; stop NAKing */ | |
2125 | if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) { | |
2126 | if (ep->dev->protocol_stall) { | |
2127 | ep->stopped = 1; | |
2128 | set_halt (ep); | |
2129 | } | |
2130 | if (!req) | |
2131 | allow_status (ep); | |
2132 | mode = 2; | |
2133 | /* reply to extra IN data tokens with a zlp */ | |
2134 | } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) { | |
2135 | if (ep->dev->protocol_stall) { | |
2136 | ep->stopped = 1; | |
2137 | set_halt (ep); | |
2138 | mode = 2; | |
2139 | } else if (!req && ep->stopped) | |
2140 | write_fifo (ep, NULL); | |
2141 | } | |
2142 | } else { | |
2143 | /* status; stop NAKing */ | |
2144 | if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) { | |
2145 | if (ep->dev->protocol_stall) { | |
2146 | ep->stopped = 1; | |
2147 | set_halt (ep); | |
2148 | } | |
2149 | mode = 2; | |
2150 | /* an extra OUT token is an error */ | |
2151 | } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) | |
2152 | && req | |
2153 | && req->req.actual == req->req.length) | |
2154 | || !req) { | |
2155 | ep->dev->protocol_stall = 1; | |
2156 | set_halt (ep); | |
2157 | ep->stopped = 1; | |
2158 | if (req) | |
2159 | done (ep, req, -EOVERFLOW); | |
2160 | req = NULL; | |
2161 | } | |
2162 | } | |
2163 | } | |
2164 | ||
2165 | if (unlikely (!req)) | |
2166 | return; | |
2167 | ||
2168 | /* manual DMA queue advance after short OUT */ | |
2169 | if (likely (ep->dma != 0)) { | |
2170 | if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) { | |
2171 | u32 count; | |
2172 | int stopped = ep->stopped; | |
2173 | ||
2174 | /* TRANSFERRED works around OUT_DONE erratum 0112. | |
2175 | * we expect (N <= maxpacket) bytes; host wrote M. | |
2176 | * iff (M < N) we won't ever see a DMA interrupt. | |
2177 | */ | |
2178 | ep->stopped = 1; | |
2179 | for (count = 0; ; t = readl (&ep->regs->ep_stat)) { | |
2180 | ||
2181 | /* any preceding dma transfers must finish. | |
2182 | * dma handles (M >= N), may empty the queue | |
2183 | */ | |
2184 | scan_dma_completions (ep); | |
2185 | if (unlikely (list_empty (&ep->queue) | |
2186 | || ep->out_overflow)) { | |
2187 | req = NULL; | |
2188 | break; | |
2189 | } | |
2190 | req = list_entry (ep->queue.next, | |
2191 | struct net2280_request, queue); | |
2192 | ||
2193 | /* here either (M < N), a "real" short rx; | |
2194 | * or (M == N) and the queue didn't empty | |
2195 | */ | |
2196 | if (likely (t & (1 << FIFO_EMPTY))) { | |
2197 | count = readl (&ep->dma->dmacount); | |
2198 | count &= DMA_BYTE_COUNT_MASK; | |
2199 | if (readl (&ep->dma->dmadesc) | |
2200 | != req->td_dma) | |
2201 | req = NULL; | |
2202 | break; | |
2203 | } | |
2204 | udelay(1); | |
2205 | } | |
2206 | ||
2207 | /* stop DMA, leave ep NAKing */ | |
2208 | writel ((1 << DMA_ABORT), &ep->dma->dmastat); | |
2209 | spin_stop_dma (ep->dma); | |
2210 | ||
2211 | if (likely (req)) { | |
2212 | req->td->dmacount = 0; | |
2213 | t = readl (&ep->regs->ep_avail); | |
2214 | dma_done (ep, req, count, t); | |
2215 | } | |
2216 | ||
2217 | /* also flush to prevent erratum 0106 trouble */ | |
2218 | if (unlikely (ep->out_overflow | |
2219 | || (ep->dev->chiprev == 0x0100 | |
2220 | && ep->dev->gadget.speed | |
2221 | == USB_SPEED_FULL))) { | |
2222 | out_flush (ep); | |
2223 | ep->out_overflow = 0; | |
2224 | } | |
2225 | ||
2226 | /* (re)start dma if needed, stop NAKing */ | |
2227 | ep->stopped = stopped; | |
2228 | if (!list_empty (&ep->queue)) | |
2229 | restart_dma (ep); | |
2230 | } else | |
2231 | DEBUG (ep->dev, "%s dma ep_stat %08x ??\n", | |
2232 | ep->ep.name, t); | |
2233 | return; | |
2234 | ||
2235 | /* data packet(s) received (in the fifo, OUT) */ | |
2236 | } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) { | |
2237 | if (read_fifo (ep, req) && ep->num != 0) | |
2238 | mode = 2; | |
2239 | ||
2240 | /* data packet(s) transmitted (IN) */ | |
2241 | } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) { | |
2242 | unsigned len; | |
2243 | ||
2244 | len = req->req.length - req->req.actual; | |
2245 | if (len > ep->ep.maxpacket) | |
2246 | len = ep->ep.maxpacket; | |
2247 | req->req.actual += len; | |
2248 | ||
2249 | /* if we wrote it all, we're usually done */ | |
2250 | if (req->req.actual == req->req.length) { | |
2251 | if (ep->num == 0) { | |
2252 | /* wait for control status */ | |
2253 | if (mode != 2) | |
2254 | req = NULL; | |
2255 | } else if (!req->req.zero || len != ep->ep.maxpacket) | |
2256 | mode = 2; | |
2257 | } | |
2258 | ||
2259 | /* there was nothing to do ... */ | |
2260 | } else if (mode == 1) | |
2261 | return; | |
2262 | ||
2263 | /* done */ | |
2264 | if (mode == 2) { | |
2265 | /* stream endpoints often resubmit/unlink in completion */ | |
2266 | done (ep, req, 0); | |
2267 | ||
2268 | /* maybe advance queue to next request */ | |
2269 | if (ep->num == 0) { | |
2270 | /* NOTE: net2280 could let gadget driver start the | |
2271 | * status stage later. since not all controllers let | |
2272 | * them control that, the api doesn't (yet) allow it. | |
2273 | */ | |
2274 | if (!ep->stopped) | |
2275 | allow_status (ep); | |
2276 | req = NULL; | |
2277 | } else { | |
2278 | if (!list_empty (&ep->queue) && !ep->stopped) | |
2279 | req = list_entry (ep->queue.next, | |
2280 | struct net2280_request, queue); | |
2281 | else | |
2282 | req = NULL; | |
2283 | if (req && !ep->is_in) | |
2284 | stop_out_naking (ep); | |
2285 | } | |
2286 | } | |
2287 | ||
2288 | /* is there a buffer for the next packet? | |
2289 | * for best streaming performance, make sure there is one. | |
2290 | */ | |
2291 | if (req && !ep->stopped) { | |
2292 | ||
2293 | /* load IN fifo with next packet (may be zlp) */ | |
2294 | if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) | |
2295 | write_fifo (ep, &req->req); | |
2296 | } | |
2297 | } | |
2298 | ||
2299 | static struct net2280_ep * | |
2300 | get_ep_by_addr (struct net2280 *dev, u16 wIndex) | |
2301 | { | |
2302 | struct net2280_ep *ep; | |
2303 | ||
2304 | if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0) | |
2305 | return &dev->ep [0]; | |
2306 | list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) { | |
2307 | u8 bEndpointAddress; | |
2308 | ||
2309 | if (!ep->desc) | |
2310 | continue; | |
2311 | bEndpointAddress = ep->desc->bEndpointAddress; | |
2312 | if ((wIndex ^ bEndpointAddress) & USB_DIR_IN) | |
2313 | continue; | |
2314 | if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f)) | |
2315 | return ep; | |
2316 | } | |
2317 | return NULL; | |
2318 | } | |
2319 | ||
2320 | static void handle_stat0_irqs (struct net2280 *dev, u32 stat) | |
2321 | { | |
2322 | struct net2280_ep *ep; | |
2323 | u32 num, scratch; | |
2324 | ||
2325 | /* most of these don't need individual acks */ | |
2326 | stat &= ~(1 << INTA_ASSERTED); | |
2327 | if (!stat) | |
2328 | return; | |
2329 | // DEBUG (dev, "irqstat0 %04x\n", stat); | |
2330 | ||
2331 | /* starting a control request? */ | |
2332 | if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) { | |
2333 | union { | |
2334 | u32 raw [2]; | |
2335 | struct usb_ctrlrequest r; | |
2336 | } u; | |
2337 | int tmp = 0; | |
2338 | struct net2280_request *req; | |
2339 | ||
2340 | if (dev->gadget.speed == USB_SPEED_UNKNOWN) { | |
2341 | if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED)) | |
2342 | dev->gadget.speed = USB_SPEED_HIGH; | |
2343 | else | |
2344 | dev->gadget.speed = USB_SPEED_FULL; | |
2345 | net2280_led_speed (dev, dev->gadget.speed); | |
2346 | DEBUG (dev, "%s speed\n", | |
2347 | (dev->gadget.speed == USB_SPEED_HIGH) | |
2348 | ? "high" : "full"); | |
2349 | } | |
2350 | ||
2351 | ep = &dev->ep [0]; | |
2352 | ep->irqs++; | |
2353 | ||
2354 | /* make sure any leftover request state is cleared */ | |
2355 | stat &= ~(1 << ENDPOINT_0_INTERRUPT); | |
2356 | while (!list_empty (&ep->queue)) { | |
2357 | req = list_entry (ep->queue.next, | |
2358 | struct net2280_request, queue); | |
2359 | done (ep, req, (req->req.actual == req->req.length) | |
2360 | ? 0 : -EPROTO); | |
2361 | } | |
2362 | ep->stopped = 0; | |
2363 | dev->protocol_stall = 0; | |
2364 | writel ( (1 << TIMEOUT) | |
2365 | | (1 << USB_STALL_SENT) | |
2366 | | (1 << USB_IN_NAK_SENT) | |
2367 | | (1 << USB_IN_ACK_RCVD) | |
2368 | | (1 << USB_OUT_PING_NAK_SENT) | |
2369 | | (1 << USB_OUT_ACK_SENT) | |
2370 | | (1 << FIFO_OVERFLOW) | |
2371 | | (1 << FIFO_UNDERFLOW) | |
2372 | | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT) | |
2373 | | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) | |
2374 | | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
2375 | | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | |
2376 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
2377 | | (1 << DATA_IN_TOKEN_INTERRUPT) | |
2378 | , &ep->regs->ep_stat); | |
2379 | u.raw [0] = readl (&dev->usb->setup0123); | |
2380 | u.raw [1] = readl (&dev->usb->setup4567); | |
2381 | ||
2382 | cpu_to_le32s (&u.raw [0]); | |
2383 | cpu_to_le32s (&u.raw [1]); | |
2384 | ||
2385 | le16_to_cpus (&u.r.wValue); | |
2386 | le16_to_cpus (&u.r.wIndex); | |
2387 | le16_to_cpus (&u.r.wLength); | |
2388 | ||
2389 | /* ack the irq */ | |
2390 | writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0); | |
2391 | stat ^= (1 << SETUP_PACKET_INTERRUPT); | |
2392 | ||
2393 | /* watch control traffic at the token level, and force | |
2394 | * synchronization before letting the status stage happen. | |
2395 | * FIXME ignore tokens we'll NAK, until driver responds. | |
2396 | * that'll mean a lot less irqs for some drivers. | |
2397 | */ | |
2398 | ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0; | |
2399 | if (ep->is_in) { | |
2400 | scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | |
2401 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
2402 | | (1 << DATA_IN_TOKEN_INTERRUPT); | |
2403 | stop_out_naking (ep); | |
2404 | } else | |
2405 | scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
2406 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
2407 | | (1 << DATA_IN_TOKEN_INTERRUPT); | |
2408 | writel (scratch, &dev->epregs [0].ep_irqenb); | |
2409 | ||
2410 | /* we made the hardware handle most lowlevel requests; | |
2411 | * everything else goes uplevel to the gadget code. | |
2412 | */ | |
2413 | switch (u.r.bRequest) { | |
2414 | case USB_REQ_GET_STATUS: { | |
2415 | struct net2280_ep *e; | |
2416 | u16 status; | |
2417 | ||
2418 | /* hw handles device and interface status */ | |
2419 | if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT)) | |
2420 | goto delegate; | |
2421 | if ((e = get_ep_by_addr (dev, u.r.wIndex)) == 0 | |
2422 | || u.r.wLength > 2) | |
2423 | goto do_stall; | |
2424 | ||
2425 | if (readl (&e->regs->ep_rsp) | |
2426 | & (1 << SET_ENDPOINT_HALT)) | |
2427 | status = __constant_cpu_to_le16 (1); | |
2428 | else | |
2429 | status = __constant_cpu_to_le16 (0); | |
2430 | ||
2431 | /* don't bother with a request object! */ | |
2432 | writel (0, &dev->epregs [0].ep_irqenb); | |
2433 | set_fifo_bytecount (ep, u.r.wLength); | |
2434 | writel (status, &dev->epregs [0].ep_data); | |
2435 | allow_status (ep); | |
2436 | VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status); | |
2437 | goto next_endpoints; | |
2438 | } | |
2439 | break; | |
2440 | case USB_REQ_CLEAR_FEATURE: { | |
2441 | struct net2280_ep *e; | |
2442 | ||
2443 | /* hw handles device features */ | |
2444 | if (u.r.bRequestType != USB_RECIP_ENDPOINT) | |
2445 | goto delegate; | |
2446 | if (u.r.wValue != USB_ENDPOINT_HALT | |
2447 | || u.r.wLength != 0) | |
2448 | goto do_stall; | |
2449 | if ((e = get_ep_by_addr (dev, u.r.wIndex)) == 0) | |
2450 | goto do_stall; | |
2451 | clear_halt (e); | |
2452 | allow_status (ep); | |
2453 | VDEBUG (dev, "%s clear halt\n", ep->ep.name); | |
2454 | goto next_endpoints; | |
2455 | } | |
2456 | break; | |
2457 | case USB_REQ_SET_FEATURE: { | |
2458 | struct net2280_ep *e; | |
2459 | ||
2460 | /* hw handles device features */ | |
2461 | if (u.r.bRequestType != USB_RECIP_ENDPOINT) | |
2462 | goto delegate; | |
2463 | if (u.r.wValue != USB_ENDPOINT_HALT | |
2464 | || u.r.wLength != 0) | |
2465 | goto do_stall; | |
2466 | if ((e = get_ep_by_addr (dev, u.r.wIndex)) == 0) | |
2467 | goto do_stall; | |
2468 | set_halt (e); | |
2469 | allow_status (ep); | |
2470 | VDEBUG (dev, "%s set halt\n", ep->ep.name); | |
2471 | goto next_endpoints; | |
2472 | } | |
2473 | break; | |
2474 | default: | |
2475 | delegate: | |
2476 | VDEBUG (dev, "setup %02x.%02x v%04x i%04x " | |
2477 | "ep_cfg %08x\n", | |
2478 | u.r.bRequestType, u.r.bRequest, | |
2479 | u.r.wValue, u.r.wIndex, | |
2480 | readl (&ep->regs->ep_cfg)); | |
2481 | spin_unlock (&dev->lock); | |
2482 | tmp = dev->driver->setup (&dev->gadget, &u.r); | |
2483 | spin_lock (&dev->lock); | |
2484 | } | |
2485 | ||
2486 | /* stall ep0 on error */ | |
2487 | if (tmp < 0) { | |
2488 | do_stall: | |
2489 | VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n", | |
2490 | u.r.bRequestType, u.r.bRequest, tmp); | |
2491 | dev->protocol_stall = 1; | |
2492 | } | |
2493 | ||
2494 | /* some in/out token irq should follow; maybe stall then. | |
2495 | * driver must queue a request (even zlp) or halt ep0 | |
2496 | * before the host times out. | |
2497 | */ | |
2498 | } | |
2499 | ||
2500 | next_endpoints: | |
2501 | /* endpoint data irq ? */ | |
2502 | scratch = stat & 0x7f; | |
2503 | stat &= ~0x7f; | |
2504 | for (num = 0; scratch; num++) { | |
2505 | u32 t; | |
2506 | ||
2507 | /* do this endpoint's FIFO and queue need tending? */ | |
2508 | t = 1 << num; | |
2509 | if ((scratch & t) == 0) | |
2510 | continue; | |
2511 | scratch ^= t; | |
2512 | ||
2513 | ep = &dev->ep [num]; | |
2514 | handle_ep_small (ep); | |
2515 | } | |
2516 | ||
2517 | if (stat) | |
2518 | DEBUG (dev, "unhandled irqstat0 %08x\n", stat); | |
2519 | } | |
2520 | ||
2521 | #define DMA_INTERRUPTS ( \ | |
2522 | (1 << DMA_D_INTERRUPT) \ | |
2523 | | (1 << DMA_C_INTERRUPT) \ | |
2524 | | (1 << DMA_B_INTERRUPT) \ | |
2525 | | (1 << DMA_A_INTERRUPT)) | |
2526 | #define PCI_ERROR_INTERRUPTS ( \ | |
2527 | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \ | |
2528 | | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \ | |
2529 | | (1 << PCI_RETRY_ABORT_INTERRUPT)) | |
2530 | ||
2531 | static void handle_stat1_irqs (struct net2280 *dev, u32 stat) | |
2532 | { | |
2533 | struct net2280_ep *ep; | |
2534 | u32 tmp, num, mask, scratch; | |
2535 | ||
2536 | /* after disconnect there's nothing else to do! */ | |
2537 | tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT); | |
2538 | mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED); | |
2539 | ||
2540 | /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set. | |
2541 | * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRRUPT set and | |
2542 | * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT | |
2543 | * only indicates a change in the reset state). | |
2544 | */ | |
2545 | if (stat & tmp) { | |
2546 | writel (tmp, &dev->regs->irqstat1); | |
2547 | if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT)) && | |
2548 | ((readl (&dev->usb->usbstat) & mask) == 0)) | |
2549 | || ((readl (&dev->usb->usbctl) & (1 << VBUS_PIN)) == 0) | |
2550 | ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) { | |
2551 | DEBUG (dev, "disconnect %s\n", | |
2552 | dev->driver->driver.name); | |
2553 | stop_activity (dev, dev->driver); | |
2554 | ep0_start (dev); | |
2555 | return; | |
2556 | } | |
2557 | stat &= ~tmp; | |
2558 | ||
2559 | /* vBUS can bounce ... one of many reasons to ignore the | |
2560 | * notion of hotplug events on bus connect/disconnect! | |
2561 | */ | |
2562 | if (!stat) | |
2563 | return; | |
2564 | } | |
2565 | ||
2566 | /* NOTE: chip stays in PCI D0 state for now, but it could | |
2567 | * enter D1 to save more power | |
2568 | */ | |
2569 | tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT); | |
2570 | if (stat & tmp) { | |
2571 | writel (tmp, &dev->regs->irqstat1); | |
2572 | if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) { | |
2573 | if (dev->driver->suspend) | |
2574 | dev->driver->suspend (&dev->gadget); | |
2575 | if (!enable_suspend) | |
2576 | stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT); | |
2577 | } else { | |
2578 | if (dev->driver->resume) | |
2579 | dev->driver->resume (&dev->gadget); | |
2580 | /* at high speed, note erratum 0133 */ | |
2581 | } | |
2582 | stat &= ~tmp; | |
2583 | } | |
2584 | ||
2585 | /* clear any other status/irqs */ | |
2586 | if (stat) | |
2587 | writel (stat, &dev->regs->irqstat1); | |
2588 | ||
2589 | /* some status we can just ignore */ | |
2590 | stat &= ~((1 << CONTROL_STATUS_INTERRUPT) | |
2591 | | (1 << SUSPEND_REQUEST_INTERRUPT) | |
2592 | | (1 << RESUME_INTERRUPT) | |
2593 | | (1 << SOF_INTERRUPT)); | |
2594 | if (!stat) | |
2595 | return; | |
2596 | // DEBUG (dev, "irqstat1 %08x\n", stat); | |
2597 | ||
2598 | /* DMA status, for ep-{a,b,c,d} */ | |
2599 | scratch = stat & DMA_INTERRUPTS; | |
2600 | stat &= ~DMA_INTERRUPTS; | |
2601 | scratch >>= 9; | |
2602 | for (num = 0; scratch; num++) { | |
2603 | struct net2280_dma_regs __iomem *dma; | |
2604 | ||
2605 | tmp = 1 << num; | |
2606 | if ((tmp & scratch) == 0) | |
2607 | continue; | |
2608 | scratch ^= tmp; | |
2609 | ||
2610 | ep = &dev->ep [num + 1]; | |
2611 | dma = ep->dma; | |
2612 | ||
2613 | if (!dma) | |
2614 | continue; | |
2615 | ||
2616 | /* clear ep's dma status */ | |
2617 | tmp = readl (&dma->dmastat); | |
2618 | writel (tmp, &dma->dmastat); | |
2619 | ||
2620 | /* chaining should stop on abort, short OUT from fifo, | |
2621 | * or (stat0 codepath) short OUT transfer. | |
2622 | */ | |
2623 | if (!use_dma_chaining) { | |
2624 | if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT)) | |
2625 | == 0) { | |
2626 | DEBUG (ep->dev, "%s no xact done? %08x\n", | |
2627 | ep->ep.name, tmp); | |
2628 | continue; | |
2629 | } | |
2630 | stop_dma (ep->dma); | |
2631 | } | |
2632 | ||
2633 | /* OUT transfers terminate when the data from the | |
2634 | * host is in our memory. Process whatever's done. | |
2635 | * On this path, we know transfer's last packet wasn't | |
2636 | * less than req->length. NAK_OUT_PACKETS may be set, | |
2637 | * or the FIFO may already be holding new packets. | |
2638 | * | |
2639 | * IN transfers can linger in the FIFO for a very | |
2640 | * long time ... we ignore that for now, accounting | |
2641 | * precisely (like PIO does) needs per-packet irqs | |
2642 | */ | |
2643 | scan_dma_completions (ep); | |
2644 | ||
2645 | /* disable dma on inactive queues; else maybe restart */ | |
2646 | if (list_empty (&ep->queue)) { | |
2647 | if (use_dma_chaining) | |
2648 | stop_dma (ep->dma); | |
2649 | } else { | |
2650 | tmp = readl (&dma->dmactl); | |
2651 | if (!use_dma_chaining | |
2652 | || (tmp & (1 << DMA_ENABLE)) == 0) | |
2653 | restart_dma (ep); | |
2654 | else if (ep->is_in && use_dma_chaining) { | |
2655 | struct net2280_request *req; | |
2656 | u32 dmacount; | |
2657 | ||
2658 | /* the descriptor at the head of the chain | |
2659 | * may still have VALID_BIT clear; that's | |
2660 | * used to trigger changing DMA_FIFO_VALIDATE | |
2661 | * (affects automagic zlp writes). | |
2662 | */ | |
2663 | req = list_entry (ep->queue.next, | |
2664 | struct net2280_request, queue); | |
2665 | dmacount = req->td->dmacount; | |
2666 | dmacount &= __constant_cpu_to_le32 ( | |
2667 | (1 << VALID_BIT) | |
2668 | | DMA_BYTE_COUNT_MASK); | |
2669 | if (dmacount && (dmacount & valid_bit) == 0) | |
2670 | restart_dma (ep); | |
2671 | } | |
2672 | } | |
2673 | ep->irqs++; | |
2674 | } | |
2675 | ||
2676 | /* NOTE: there are other PCI errors we might usefully notice. | |
2677 | * if they appear very often, here's where to try recovering. | |
2678 | */ | |
2679 | if (stat & PCI_ERROR_INTERRUPTS) { | |
2680 | ERROR (dev, "pci dma error; stat %08x\n", stat); | |
2681 | stat &= ~PCI_ERROR_INTERRUPTS; | |
2682 | /* these are fatal errors, but "maybe" they won't | |
2683 | * happen again ... | |
2684 | */ | |
2685 | stop_activity (dev, dev->driver); | |
2686 | ep0_start (dev); | |
2687 | stat = 0; | |
2688 | } | |
2689 | ||
2690 | if (stat) | |
2691 | DEBUG (dev, "unhandled irqstat1 %08x\n", stat); | |
2692 | } | |
2693 | ||
2694 | static irqreturn_t net2280_irq (int irq, void *_dev, struct pt_regs * r) | |
2695 | { | |
2696 | struct net2280 *dev = _dev; | |
2697 | ||
2698 | spin_lock (&dev->lock); | |
2699 | ||
2700 | /* handle disconnect, dma, and more */ | |
2701 | handle_stat1_irqs (dev, readl (&dev->regs->irqstat1)); | |
2702 | ||
2703 | /* control requests and PIO */ | |
2704 | handle_stat0_irqs (dev, readl (&dev->regs->irqstat0)); | |
2705 | ||
2706 | spin_unlock (&dev->lock); | |
2707 | ||
2708 | return IRQ_HANDLED; | |
2709 | } | |
2710 | ||
2711 | /*-------------------------------------------------------------------------*/ | |
2712 | ||
2713 | static void gadget_release (struct device *_dev) | |
2714 | { | |
2715 | struct net2280 *dev = dev_get_drvdata (_dev); | |
2716 | ||
2717 | kfree (dev); | |
2718 | } | |
2719 | ||
2720 | /* tear down the binding between this driver and the pci device */ | |
2721 | ||
2722 | static void net2280_remove (struct pci_dev *pdev) | |
2723 | { | |
2724 | struct net2280 *dev = pci_get_drvdata (pdev); | |
2725 | ||
2726 | /* start with the driver above us */ | |
2727 | if (dev->driver) { | |
2728 | /* should have been done already by driver model core */ | |
2729 | WARN (dev, "pci remove, driver '%s' is still registered\n", | |
2730 | dev->driver->driver.name); | |
2731 | usb_gadget_unregister_driver (dev->driver); | |
2732 | } | |
2733 | ||
2734 | /* then clean up the resources we allocated during probe() */ | |
2735 | net2280_led_shutdown (dev); | |
2736 | if (dev->requests) { | |
2737 | int i; | |
2738 | for (i = 1; i < 5; i++) { | |
2739 | if (!dev->ep [i].dummy) | |
2740 | continue; | |
2741 | pci_pool_free (dev->requests, dev->ep [i].dummy, | |
2742 | dev->ep [i].td_dma); | |
2743 | } | |
2744 | pci_pool_destroy (dev->requests); | |
2745 | } | |
2746 | if (dev->got_irq) | |
2747 | free_irq (pdev->irq, dev); | |
2748 | if (dev->regs) | |
2749 | iounmap (dev->regs); | |
2750 | if (dev->region) | |
2751 | release_mem_region (pci_resource_start (pdev, 0), | |
2752 | pci_resource_len (pdev, 0)); | |
2753 | if (dev->enabled) | |
2754 | pci_disable_device (pdev); | |
2755 | device_unregister (&dev->gadget.dev); | |
2756 | device_remove_file (&pdev->dev, &dev_attr_registers); | |
2757 | pci_set_drvdata (pdev, NULL); | |
2758 | ||
2759 | INFO (dev, "unbind\n"); | |
2760 | ||
2761 | the_controller = NULL; | |
2762 | } | |
2763 | ||
2764 | /* wrap this driver around the specified device, but | |
2765 | * don't respond over USB until a gadget driver binds to us. | |
2766 | */ | |
2767 | ||
2768 | static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id) | |
2769 | { | |
2770 | struct net2280 *dev; | |
2771 | unsigned long resource, len; | |
2772 | void __iomem *base = NULL; | |
2773 | int retval, i; | |
2774 | char buf [8], *bufp; | |
2775 | ||
2776 | /* if you want to support more than one controller in a system, | |
2777 | * usb_gadget_driver_{register,unregister}() must change. | |
2778 | */ | |
2779 | if (the_controller) { | |
2780 | dev_warn (&pdev->dev, "ignoring\n"); | |
2781 | return -EBUSY; | |
2782 | } | |
2783 | ||
2784 | /* alloc, and start init */ | |
2785 | dev = kmalloc (sizeof *dev, SLAB_KERNEL); | |
2786 | if (dev == NULL){ | |
2787 | retval = -ENOMEM; | |
2788 | goto done; | |
2789 | } | |
2790 | ||
2791 | memset (dev, 0, sizeof *dev); | |
2792 | spin_lock_init (&dev->lock); | |
2793 | dev->pdev = pdev; | |
2794 | dev->gadget.ops = &net2280_ops; | |
2795 | dev->gadget.is_dualspeed = 1; | |
2796 | ||
2797 | /* the "gadget" abstracts/virtualizes the controller */ | |
2798 | strcpy (dev->gadget.dev.bus_id, "gadget"); | |
2799 | dev->gadget.dev.parent = &pdev->dev; | |
2800 | dev->gadget.dev.dma_mask = pdev->dev.dma_mask; | |
2801 | dev->gadget.dev.release = gadget_release; | |
2802 | dev->gadget.name = driver_name; | |
2803 | ||
2804 | /* now all the pci goodies ... */ | |
2805 | if (pci_enable_device (pdev) < 0) { | |
2806 | retval = -ENODEV; | |
2807 | goto done; | |
2808 | } | |
2809 | dev->enabled = 1; | |
2810 | ||
2811 | /* BAR 0 holds all the registers | |
2812 | * BAR 1 is 8051 memory; unused here (note erratum 0103) | |
2813 | * BAR 2 is fifo memory; unused here | |
2814 | */ | |
2815 | resource = pci_resource_start (pdev, 0); | |
2816 | len = pci_resource_len (pdev, 0); | |
2817 | if (!request_mem_region (resource, len, driver_name)) { | |
2818 | DEBUG (dev, "controller already in use\n"); | |
2819 | retval = -EBUSY; | |
2820 | goto done; | |
2821 | } | |
2822 | dev->region = 1; | |
2823 | ||
2824 | base = ioremap_nocache (resource, len); | |
2825 | if (base == NULL) { | |
2826 | DEBUG (dev, "can't map memory\n"); | |
2827 | retval = -EFAULT; | |
2828 | goto done; | |
2829 | } | |
2830 | dev->regs = (struct net2280_regs __iomem *) base; | |
2831 | dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080); | |
2832 | dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100); | |
2833 | dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180); | |
2834 | dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200); | |
2835 | dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300); | |
2836 | ||
2837 | /* put into initial config, link up all endpoints */ | |
2838 | writel (0, &dev->usb->usbctl); | |
2839 | usb_reset (dev); | |
2840 | usb_reinit (dev); | |
2841 | ||
2842 | /* irq setup after old hardware is cleaned up */ | |
2843 | if (!pdev->irq) { | |
2844 | ERROR (dev, "No IRQ. Check PCI setup!\n"); | |
2845 | retval = -ENODEV; | |
2846 | goto done; | |
2847 | } | |
2848 | #ifndef __sparc__ | |
2849 | scnprintf (buf, sizeof buf, "%d", pdev->irq); | |
2850 | bufp = buf; | |
2851 | #else | |
2852 | bufp = __irq_itoa(pdev->irq); | |
2853 | #endif | |
2854 | if (request_irq (pdev->irq, net2280_irq, SA_SHIRQ, driver_name, dev) | |
2855 | != 0) { | |
2856 | ERROR (dev, "request interrupt %s failed\n", bufp); | |
2857 | retval = -EBUSY; | |
2858 | goto done; | |
2859 | } | |
2860 | dev->got_irq = 1; | |
2861 | ||
2862 | /* DMA setup */ | |
2863 | /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */ | |
2864 | dev->requests = pci_pool_create ("requests", pdev, | |
2865 | sizeof (struct net2280_dma), | |
2866 | 0 /* no alignment requirements */, | |
2867 | 0 /* or page-crossing issues */); | |
2868 | if (!dev->requests) { | |
2869 | DEBUG (dev, "can't get request pool\n"); | |
2870 | retval = -ENOMEM; | |
2871 | goto done; | |
2872 | } | |
2873 | for (i = 1; i < 5; i++) { | |
2874 | struct net2280_dma *td; | |
2875 | ||
2876 | td = pci_pool_alloc (dev->requests, GFP_KERNEL, | |
2877 | &dev->ep [i].td_dma); | |
2878 | if (!td) { | |
2879 | DEBUG (dev, "can't get dummy %d\n", i); | |
2880 | retval = -ENOMEM; | |
2881 | goto done; | |
2882 | } | |
2883 | td->dmacount = 0; /* not VALID */ | |
2884 | td->dmaaddr = __constant_cpu_to_le32 (DMA_ADDR_INVALID); | |
2885 | td->dmadesc = td->dmaaddr; | |
2886 | dev->ep [i].dummy = td; | |
2887 | } | |
2888 | ||
2889 | /* enable lower-overhead pci memory bursts during DMA */ | |
2890 | writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) | |
2891 | // 256 write retries may not be enough... | |
2892 | // | (1 << PCI_RETRY_ABORT_ENABLE) | |
2893 | | (1 << DMA_READ_MULTIPLE_ENABLE) | |
2894 | | (1 << DMA_READ_LINE_ENABLE) | |
2895 | , &dev->pci->pcimstctl); | |
2896 | /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */ | |
2897 | pci_set_master (pdev); | |
2898 | pci_set_mwi (pdev); | |
2899 | ||
2900 | /* ... also flushes any posted pci writes */ | |
2901 | dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff; | |
2902 | ||
2903 | /* done */ | |
2904 | pci_set_drvdata (pdev, dev); | |
2905 | INFO (dev, "%s\n", driver_desc); | |
2906 | INFO (dev, "irq %s, pci mem %p, chip rev %04x\n", | |
2907 | bufp, base, dev->chiprev); | |
2908 | INFO (dev, "version: " DRIVER_VERSION "; dma %s\n", | |
2909 | use_dma | |
2910 | ? (use_dma_chaining ? "chaining" : "enabled") | |
2911 | : "disabled"); | |
2912 | the_controller = dev; | |
2913 | ||
2914 | device_register (&dev->gadget.dev); | |
2915 | device_create_file (&pdev->dev, &dev_attr_registers); | |
2916 | ||
2917 | return 0; | |
2918 | ||
2919 | done: | |
2920 | if (dev) | |
2921 | net2280_remove (pdev); | |
2922 | return retval; | |
2923 | } | |
2924 | ||
2925 | ||
2926 | /*-------------------------------------------------------------------------*/ | |
2927 | ||
2928 | static struct pci_device_id pci_ids [] = { { | |
2929 | .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), | |
2930 | .class_mask = ~0, | |
2931 | .vendor = 0x17cc, | |
2932 | .device = 0x2280, | |
2933 | .subvendor = PCI_ANY_ID, | |
2934 | .subdevice = PCI_ANY_ID, | |
2935 | ||
2936 | }, { /* end: all zeroes */ } | |
2937 | }; | |
2938 | MODULE_DEVICE_TABLE (pci, pci_ids); | |
2939 | ||
2940 | /* pci driver glue; this is a "new style" PCI driver module */ | |
2941 | static struct pci_driver net2280_pci_driver = { | |
2942 | .name = (char *) driver_name, | |
2943 | .id_table = pci_ids, | |
2944 | ||
2945 | .probe = net2280_probe, | |
2946 | .remove = net2280_remove, | |
2947 | ||
2948 | /* FIXME add power management support */ | |
2949 | }; | |
2950 | ||
2951 | MODULE_DESCRIPTION (DRIVER_DESC); | |
2952 | MODULE_AUTHOR ("David Brownell"); | |
2953 | MODULE_LICENSE ("GPL"); | |
2954 | ||
2955 | static int __init init (void) | |
2956 | { | |
2957 | if (!use_dma) | |
2958 | use_dma_chaining = 0; | |
2959 | return pci_register_driver (&net2280_pci_driver); | |
2960 | } | |
2961 | module_init (init); | |
2962 | ||
2963 | static void __exit cleanup (void) | |
2964 | { | |
2965 | pci_unregister_driver (&net2280_pci_driver); | |
2966 | } | |
2967 | module_exit (cleanup); |