Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Driver for the PLX NET2280 USB device controller. | |
3 | * Specs and errata are available from <http://www.plxtech.com>. | |
4 | * | |
901b3d75 | 5 | * PLX Technology Inc. (formerly NetChip Technology) supported the |
1da177e4 LT |
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 | * | |
901b3d75 DB |
29 | * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility |
30 | * with 2282 chip | |
950ee4c8 | 31 | * |
1da177e4 LT |
32 | * This program is free software; you can redistribute it and/or modify |
33 | * it under the terms of the GNU General Public License as published by | |
34 | * the Free Software Foundation; either version 2 of the License, or | |
35 | * (at your option) any later version. | |
36 | * | |
37 | * This program is distributed in the hope that it will be useful, | |
38 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
39 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
40 | * GNU General Public License for more details. | |
41 | * | |
42 | * You should have received a copy of the GNU General Public License | |
43 | * along with this program; if not, write to the Free Software | |
44 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
45 | */ | |
46 | ||
47 | #undef DEBUG /* messages on error and most fault paths */ | |
48 | #undef VERBOSE /* extra debug messages (success too) */ | |
49 | ||
1da177e4 LT |
50 | #include <linux/module.h> |
51 | #include <linux/pci.h> | |
682d4c80 | 52 | #include <linux/dma-mapping.h> |
1da177e4 LT |
53 | #include <linux/kernel.h> |
54 | #include <linux/delay.h> | |
55 | #include <linux/ioport.h> | |
1da177e4 | 56 | #include <linux/slab.h> |
1da177e4 LT |
57 | #include <linux/errno.h> |
58 | #include <linux/init.h> | |
59 | #include <linux/timer.h> | |
60 | #include <linux/list.h> | |
61 | #include <linux/interrupt.h> | |
62 | #include <linux/moduleparam.h> | |
63 | #include <linux/device.h> | |
5f848137 | 64 | #include <linux/usb/ch9.h> |
9454a57a | 65 | #include <linux/usb/gadget.h> |
b38b03b3 | 66 | #include <linux/prefetch.h> |
1da177e4 LT |
67 | |
68 | #include <asm/byteorder.h> | |
69 | #include <asm/io.h> | |
70 | #include <asm/irq.h> | |
71 | #include <asm/system.h> | |
72 | #include <asm/unaligned.h> | |
73 | ||
74 | ||
950ee4c8 GL |
75 | #define DRIVER_DESC "PLX NET228x USB Peripheral Controller" |
76 | #define DRIVER_VERSION "2005 Sept 27" | |
1da177e4 LT |
77 | |
78 | #define DMA_ADDR_INVALID (~(dma_addr_t)0) | |
79 | #define EP_DONTUSE 13 /* nonzero */ | |
80 | ||
81 | #define USE_RDK_LEDS /* GPIO pins control three LEDs */ | |
82 | ||
83 | ||
84 | static const char driver_name [] = "net2280"; | |
85 | static const char driver_desc [] = DRIVER_DESC; | |
86 | ||
87 | static const char ep0name [] = "ep0"; | |
901b3d75 | 88 | static const char *const ep_name [] = { |
1da177e4 LT |
89 | ep0name, |
90 | "ep-a", "ep-b", "ep-c", "ep-d", | |
91 | "ep-e", "ep-f", | |
92 | }; | |
93 | ||
94 | /* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO) | |
95 | * use_dma_chaining -- dma descriptor queueing gives even more irq reduction | |
96 | * | |
97 | * The net2280 DMA engines are not tightly integrated with their FIFOs; | |
98 | * not all cases are (yet) handled well in this driver or the silicon. | |
99 | * Some gadget drivers work better with the dma support here than others. | |
100 | * These two parameters let you use PIO or more aggressive DMA. | |
101 | */ | |
102 | static int use_dma = 1; | |
103 | static int use_dma_chaining = 0; | |
104 | ||
105 | /* "modprobe net2280 use_dma=n" etc */ | |
106 | module_param (use_dma, bool, S_IRUGO); | |
107 | module_param (use_dma_chaining, bool, S_IRUGO); | |
108 | ||
109 | ||
110 | /* mode 0 == ep-{a,b,c,d} 1K fifo each | |
111 | * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable | |
112 | * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable | |
113 | */ | |
114 | static ushort fifo_mode = 0; | |
115 | ||
116 | /* "modprobe net2280 fifo_mode=1" etc */ | |
117 | module_param (fifo_mode, ushort, 0644); | |
118 | ||
119 | /* enable_suspend -- When enabled, the driver will respond to | |
120 | * USB suspend requests by powering down the NET2280. Otherwise, | |
25985edc | 121 | * USB suspend requests will be ignored. This is acceptable for |
950ee4c8 | 122 | * self-powered devices |
1da177e4 LT |
123 | */ |
124 | static int enable_suspend = 0; | |
125 | ||
126 | /* "modprobe net2280 enable_suspend=1" etc */ | |
127 | module_param (enable_suspend, bool, S_IRUGO); | |
128 | ||
129 | ||
130 | #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out") | |
131 | ||
132 | #if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG) | |
133 | static char *type_string (u8 bmAttributes) | |
134 | { | |
135 | switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) { | |
136 | case USB_ENDPOINT_XFER_BULK: return "bulk"; | |
137 | case USB_ENDPOINT_XFER_ISOC: return "iso"; | |
138 | case USB_ENDPOINT_XFER_INT: return "intr"; | |
139 | }; | |
140 | return "control"; | |
141 | } | |
142 | #endif | |
143 | ||
144 | #include "net2280.h" | |
145 | ||
551509d2 HH |
146 | #define valid_bit cpu_to_le32 (1 << VALID_BIT) |
147 | #define dma_done_ie cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE) | |
1da177e4 LT |
148 | |
149 | /*-------------------------------------------------------------------------*/ | |
150 | ||
151 | static int | |
152 | net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) | |
153 | { | |
154 | struct net2280 *dev; | |
155 | struct net2280_ep *ep; | |
156 | u32 max, tmp; | |
157 | unsigned long flags; | |
158 | ||
159 | ep = container_of (_ep, struct net2280_ep, ep); | |
160 | if (!_ep || !desc || ep->desc || _ep->name == ep0name | |
161 | || desc->bDescriptorType != USB_DT_ENDPOINT) | |
162 | return -EINVAL; | |
163 | dev = ep->dev; | |
164 | if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) | |
165 | return -ESHUTDOWN; | |
166 | ||
167 | /* erratum 0119 workaround ties up an endpoint number */ | |
168 | if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) | |
169 | return -EDOM; | |
170 | ||
171 | /* sanity check ep-e/ep-f since their fifos are small */ | |
172 | max = le16_to_cpu (desc->wMaxPacketSize) & 0x1fff; | |
173 | if (ep->num > 4 && max > 64) | |
174 | return -ERANGE; | |
175 | ||
176 | spin_lock_irqsave (&dev->lock, flags); | |
177 | _ep->maxpacket = max & 0x7ff; | |
178 | ep->desc = desc; | |
179 | ||
180 | /* ep_reset() has already been called */ | |
181 | ep->stopped = 0; | |
8066134f | 182 | ep->wedged = 0; |
1da177e4 LT |
183 | ep->out_overflow = 0; |
184 | ||
185 | /* set speed-dependent max packet; may kick in high bandwidth */ | |
186 | set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max); | |
187 | ||
188 | /* FIFO lines can't go to different packets. PIO is ok, so | |
189 | * use it instead of troublesome (non-bulk) multi-packet DMA. | |
190 | */ | |
191 | if (ep->dma && (max % 4) != 0 && use_dma_chaining) { | |
192 | DEBUG (ep->dev, "%s, no dma for maxpacket %d\n", | |
193 | ep->ep.name, ep->ep.maxpacket); | |
194 | ep->dma = NULL; | |
195 | } | |
196 | ||
197 | /* set type, direction, address; reset fifo counters */ | |
198 | writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat); | |
199 | tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK); | |
200 | if (tmp == USB_ENDPOINT_XFER_INT) { | |
201 | /* erratum 0105 workaround prevents hs NYET */ | |
202 | if (dev->chiprev == 0100 | |
203 | && dev->gadget.speed == USB_SPEED_HIGH | |
204 | && !(desc->bEndpointAddress & USB_DIR_IN)) | |
205 | writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE), | |
206 | &ep->regs->ep_rsp); | |
207 | } else if (tmp == USB_ENDPOINT_XFER_BULK) { | |
208 | /* catch some particularly blatant driver bugs */ | |
209 | if ((dev->gadget.speed == USB_SPEED_HIGH | |
210 | && max != 512) | |
211 | || (dev->gadget.speed == USB_SPEED_FULL | |
212 | && max > 64)) { | |
213 | spin_unlock_irqrestore (&dev->lock, flags); | |
214 | return -ERANGE; | |
215 | } | |
216 | } | |
217 | ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0; | |
218 | tmp <<= ENDPOINT_TYPE; | |
219 | tmp |= desc->bEndpointAddress; | |
220 | tmp |= (4 << ENDPOINT_BYTE_COUNT); /* default full fifo lines */ | |
221 | tmp |= 1 << ENDPOINT_ENABLE; | |
222 | wmb (); | |
223 | ||
224 | /* for OUT transfers, block the rx fifo until a read is posted */ | |
225 | ep->is_in = (tmp & USB_DIR_IN) != 0; | |
226 | if (!ep->is_in) | |
227 | writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp); | |
950ee4c8 | 228 | else if (dev->pdev->device != 0x2280) { |
901b3d75 DB |
229 | /* Added for 2282, Don't use nak packets on an in endpoint, |
230 | * this was ignored on 2280 | |
231 | */ | |
950ee4c8 GL |
232 | writel ((1 << CLEAR_NAK_OUT_PACKETS) |
233 | | (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp); | |
234 | } | |
1da177e4 LT |
235 | |
236 | writel (tmp, &ep->regs->ep_cfg); | |
237 | ||
238 | /* enable irqs */ | |
239 | if (!ep->dma) { /* pio, per-packet */ | |
240 | tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0); | |
241 | writel (tmp, &dev->regs->pciirqenb0); | |
242 | ||
243 | tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) | |
950ee4c8 GL |
244 | | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE); |
245 | if (dev->pdev->device == 0x2280) | |
246 | tmp |= readl (&ep->regs->ep_irqenb); | |
1da177e4 LT |
247 | writel (tmp, &ep->regs->ep_irqenb); |
248 | } else { /* dma, per-request */ | |
249 | tmp = (1 << (8 + ep->num)); /* completion */ | |
250 | tmp |= readl (&dev->regs->pciirqenb1); | |
251 | writel (tmp, &dev->regs->pciirqenb1); | |
252 | ||
253 | /* for short OUT transfers, dma completions can't | |
254 | * advance the queue; do it pio-style, by hand. | |
255 | * NOTE erratum 0112 workaround #2 | |
256 | */ | |
257 | if ((desc->bEndpointAddress & USB_DIR_IN) == 0) { | |
258 | tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE); | |
259 | writel (tmp, &ep->regs->ep_irqenb); | |
260 | ||
261 | tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0); | |
262 | writel (tmp, &dev->regs->pciirqenb0); | |
263 | } | |
264 | } | |
265 | ||
266 | tmp = desc->bEndpointAddress; | |
267 | DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n", | |
268 | _ep->name, tmp & 0x0f, DIR_STRING (tmp), | |
269 | type_string (desc->bmAttributes), | |
270 | ep->dma ? "dma" : "pio", max); | |
271 | ||
272 | /* pci writes may still be posted */ | |
273 | spin_unlock_irqrestore (&dev->lock, flags); | |
274 | return 0; | |
275 | } | |
276 | ||
277 | static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec) | |
278 | { | |
279 | u32 result; | |
280 | ||
281 | do { | |
282 | result = readl (ptr); | |
283 | if (result == ~(u32)0) /* "device unplugged" */ | |
284 | return -ENODEV; | |
285 | result &= mask; | |
286 | if (result == done) | |
287 | return 0; | |
288 | udelay (1); | |
289 | usec--; | |
290 | } while (usec > 0); | |
291 | return -ETIMEDOUT; | |
292 | } | |
293 | ||
901b3d75 | 294 | static const struct usb_ep_ops net2280_ep_ops; |
1da177e4 LT |
295 | |
296 | static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep) | |
297 | { | |
298 | u32 tmp; | |
299 | ||
300 | ep->desc = NULL; | |
301 | INIT_LIST_HEAD (&ep->queue); | |
302 | ||
303 | ep->ep.maxpacket = ~0; | |
304 | ep->ep.ops = &net2280_ep_ops; | |
305 | ||
306 | /* disable the dma, irqs, endpoint... */ | |
307 | if (ep->dma) { | |
308 | writel (0, &ep->dma->dmactl); | |
309 | writel ( (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT) | |
310 | | (1 << DMA_TRANSACTION_DONE_INTERRUPT) | |
311 | | (1 << DMA_ABORT) | |
312 | , &ep->dma->dmastat); | |
313 | ||
314 | tmp = readl (®s->pciirqenb0); | |
315 | tmp &= ~(1 << ep->num); | |
316 | writel (tmp, ®s->pciirqenb0); | |
317 | } else { | |
318 | tmp = readl (®s->pciirqenb1); | |
319 | tmp &= ~(1 << (8 + ep->num)); /* completion */ | |
320 | writel (tmp, ®s->pciirqenb1); | |
321 | } | |
322 | writel (0, &ep->regs->ep_irqenb); | |
323 | ||
324 | /* init to our chosen defaults, notably so that we NAK OUT | |
325 | * packets until the driver queues a read (+note erratum 0112) | |
326 | */ | |
950ee4c8 GL |
327 | if (!ep->is_in || ep->dev->pdev->device == 0x2280) { |
328 | tmp = (1 << SET_NAK_OUT_PACKETS_MODE) | |
1da177e4 LT |
329 | | (1 << SET_NAK_OUT_PACKETS) |
330 | | (1 << CLEAR_EP_HIDE_STATUS_PHASE) | |
331 | | (1 << CLEAR_INTERRUPT_MODE); | |
950ee4c8 GL |
332 | } else { |
333 | /* added for 2282 */ | |
334 | tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE) | |
335 | | (1 << CLEAR_NAK_OUT_PACKETS) | |
336 | | (1 << CLEAR_EP_HIDE_STATUS_PHASE) | |
337 | | (1 << CLEAR_INTERRUPT_MODE); | |
338 | } | |
1da177e4 LT |
339 | |
340 | if (ep->num != 0) { | |
341 | tmp |= (1 << CLEAR_ENDPOINT_TOGGLE) | |
342 | | (1 << CLEAR_ENDPOINT_HALT); | |
343 | } | |
344 | writel (tmp, &ep->regs->ep_rsp); | |
345 | ||
346 | /* scrub most status bits, and flush any fifo state */ | |
950ee4c8 GL |
347 | if (ep->dev->pdev->device == 0x2280) |
348 | tmp = (1 << FIFO_OVERFLOW) | |
349 | | (1 << FIFO_UNDERFLOW); | |
350 | else | |
351 | tmp = 0; | |
352 | ||
353 | writel (tmp | (1 << TIMEOUT) | |
1da177e4 LT |
354 | | (1 << USB_STALL_SENT) |
355 | | (1 << USB_IN_NAK_SENT) | |
356 | | (1 << USB_IN_ACK_RCVD) | |
357 | | (1 << USB_OUT_PING_NAK_SENT) | |
358 | | (1 << USB_OUT_ACK_SENT) | |
1da177e4 LT |
359 | | (1 << FIFO_FLUSH) |
360 | | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT) | |
361 | | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) | |
362 | | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
363 | | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | |
364 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
365 | | (1 << DATA_IN_TOKEN_INTERRUPT) | |
366 | , &ep->regs->ep_stat); | |
367 | ||
368 | /* fifo size is handled separately */ | |
369 | } | |
370 | ||
371 | static void nuke (struct net2280_ep *); | |
372 | ||
373 | static int net2280_disable (struct usb_ep *_ep) | |
374 | { | |
375 | struct net2280_ep *ep; | |
376 | unsigned long flags; | |
377 | ||
378 | ep = container_of (_ep, struct net2280_ep, ep); | |
379 | if (!_ep || !ep->desc || _ep->name == ep0name) | |
380 | return -EINVAL; | |
381 | ||
382 | spin_lock_irqsave (&ep->dev->lock, flags); | |
383 | nuke (ep); | |
384 | ep_reset (ep->dev->regs, ep); | |
385 | ||
386 | VDEBUG (ep->dev, "disabled %s %s\n", | |
387 | ep->dma ? "dma" : "pio", _ep->name); | |
388 | ||
389 | /* synch memory views with the device */ | |
390 | (void) readl (&ep->regs->ep_cfg); | |
391 | ||
392 | if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4) | |
393 | ep->dma = &ep->dev->dma [ep->num - 1]; | |
394 | ||
395 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
396 | return 0; | |
397 | } | |
398 | ||
399 | /*-------------------------------------------------------------------------*/ | |
400 | ||
401 | static struct usb_request * | |
55016f10 | 402 | net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags) |
1da177e4 LT |
403 | { |
404 | struct net2280_ep *ep; | |
405 | struct net2280_request *req; | |
406 | ||
407 | if (!_ep) | |
408 | return NULL; | |
409 | ep = container_of (_ep, struct net2280_ep, ep); | |
410 | ||
7039f422 | 411 | req = kzalloc(sizeof(*req), gfp_flags); |
1da177e4 LT |
412 | if (!req) |
413 | return NULL; | |
414 | ||
1da177e4 LT |
415 | req->req.dma = DMA_ADDR_INVALID; |
416 | INIT_LIST_HEAD (&req->queue); | |
417 | ||
418 | /* this dma descriptor may be swapped with the previous dummy */ | |
419 | if (ep->dma) { | |
420 | struct net2280_dma *td; | |
421 | ||
422 | td = pci_pool_alloc (ep->dev->requests, gfp_flags, | |
423 | &req->td_dma); | |
424 | if (!td) { | |
425 | kfree (req); | |
426 | return NULL; | |
427 | } | |
428 | td->dmacount = 0; /* not VALID */ | |
551509d2 | 429 | td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID); |
1da177e4 LT |
430 | td->dmadesc = td->dmaaddr; |
431 | req->td = td; | |
432 | } | |
433 | return &req->req; | |
434 | } | |
435 | ||
436 | static void | |
437 | net2280_free_request (struct usb_ep *_ep, struct usb_request *_req) | |
438 | { | |
439 | struct net2280_ep *ep; | |
440 | struct net2280_request *req; | |
441 | ||
442 | ep = container_of (_ep, struct net2280_ep, ep); | |
443 | if (!_ep || !_req) | |
444 | return; | |
445 | ||
446 | req = container_of (_req, struct net2280_request, req); | |
447 | WARN_ON (!list_empty (&req->queue)); | |
448 | if (req->td) | |
449 | pci_pool_free (ep->dev->requests, req->td, req->td_dma); | |
450 | kfree (req); | |
451 | } | |
452 | ||
453 | /*-------------------------------------------------------------------------*/ | |
454 | ||
1da177e4 LT |
455 | /* load a packet into the fifo we use for usb IN transfers. |
456 | * works for all endpoints. | |
457 | * | |
458 | * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo | |
459 | * at a time, but this code is simpler because it knows it only writes | |
460 | * one packet. ep-a..ep-d should use dma instead. | |
461 | */ | |
462 | static void | |
463 | write_fifo (struct net2280_ep *ep, struct usb_request *req) | |
464 | { | |
465 | struct net2280_ep_regs __iomem *regs = ep->regs; | |
466 | u8 *buf; | |
467 | u32 tmp; | |
468 | unsigned count, total; | |
469 | ||
470 | /* INVARIANT: fifo is currently empty. (testable) */ | |
471 | ||
472 | if (req) { | |
473 | buf = req->buf + req->actual; | |
474 | prefetch (buf); | |
475 | total = req->length - req->actual; | |
476 | } else { | |
477 | total = 0; | |
478 | buf = NULL; | |
479 | } | |
480 | ||
481 | /* write just one packet at a time */ | |
482 | count = ep->ep.maxpacket; | |
483 | if (count > total) /* min() cannot be used on a bitfield */ | |
484 | count = total; | |
485 | ||
486 | VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n", | |
487 | ep->ep.name, count, | |
488 | (count != ep->ep.maxpacket) ? " (short)" : "", | |
489 | req); | |
490 | while (count >= 4) { | |
491 | /* NOTE be careful if you try to align these. fifo lines | |
492 | * should normally be full (4 bytes) and successive partial | |
493 | * lines are ok only in certain cases. | |
494 | */ | |
495 | tmp = get_unaligned ((u32 *)buf); | |
496 | cpu_to_le32s (&tmp); | |
497 | writel (tmp, ®s->ep_data); | |
498 | buf += 4; | |
499 | count -= 4; | |
500 | } | |
501 | ||
502 | /* last fifo entry is "short" unless we wrote a full packet. | |
503 | * also explicitly validate last word in (periodic) transfers | |
504 | * when maxpacket is not a multiple of 4 bytes. | |
505 | */ | |
506 | if (count || total < ep->ep.maxpacket) { | |
507 | tmp = count ? get_unaligned ((u32 *)buf) : count; | |
508 | cpu_to_le32s (&tmp); | |
509 | set_fifo_bytecount (ep, count & 0x03); | |
510 | writel (tmp, ®s->ep_data); | |
511 | } | |
512 | ||
513 | /* pci writes may still be posted */ | |
514 | } | |
515 | ||
516 | /* work around erratum 0106: PCI and USB race over the OUT fifo. | |
517 | * caller guarantees chiprev 0100, out endpoint is NAKing, and | |
518 | * there's no real data in the fifo. | |
519 | * | |
520 | * NOTE: also used in cases where that erratum doesn't apply: | |
521 | * where the host wrote "too much" data to us. | |
522 | */ | |
523 | static void out_flush (struct net2280_ep *ep) | |
524 | { | |
525 | u32 __iomem *statp; | |
526 | u32 tmp; | |
527 | ||
528 | ASSERT_OUT_NAKING (ep); | |
529 | ||
530 | statp = &ep->regs->ep_stat; | |
531 | writel ( (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
532 | | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
533 | , statp); | |
534 | writel ((1 << FIFO_FLUSH), statp); | |
535 | mb (); | |
536 | tmp = readl (statp); | |
537 | if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
538 | /* high speed did bulk NYET; fifo isn't filling */ | |
539 | && ep->dev->gadget.speed == USB_SPEED_FULL) { | |
540 | unsigned usec; | |
541 | ||
542 | usec = 50; /* 64 byte bulk/interrupt */ | |
543 | handshake (statp, (1 << USB_OUT_PING_NAK_SENT), | |
544 | (1 << USB_OUT_PING_NAK_SENT), usec); | |
545 | /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */ | |
546 | } | |
547 | } | |
548 | ||
549 | /* unload packet(s) from the fifo we use for usb OUT transfers. | |
550 | * returns true iff the request completed, because of short packet | |
551 | * or the request buffer having filled with full packets. | |
552 | * | |
553 | * for ep-a..ep-d this will read multiple packets out when they | |
554 | * have been accepted. | |
555 | */ | |
556 | static int | |
557 | read_fifo (struct net2280_ep *ep, struct net2280_request *req) | |
558 | { | |
559 | struct net2280_ep_regs __iomem *regs = ep->regs; | |
560 | u8 *buf = req->req.buf + req->req.actual; | |
561 | unsigned count, tmp, is_short; | |
562 | unsigned cleanup = 0, prevent = 0; | |
563 | ||
564 | /* erratum 0106 ... packets coming in during fifo reads might | |
565 | * be incompletely rejected. not all cases have workarounds. | |
566 | */ | |
567 | if (ep->dev->chiprev == 0x0100 | |
568 | && ep->dev->gadget.speed == USB_SPEED_FULL) { | |
569 | udelay (1); | |
570 | tmp = readl (&ep->regs->ep_stat); | |
571 | if ((tmp & (1 << NAK_OUT_PACKETS))) | |
572 | cleanup = 1; | |
573 | else if ((tmp & (1 << FIFO_FULL))) { | |
574 | start_out_naking (ep); | |
575 | prevent = 1; | |
576 | } | |
577 | /* else: hope we don't see the problem */ | |
578 | } | |
579 | ||
580 | /* never overflow the rx buffer. the fifo reads packets until | |
581 | * it sees a short one; we might not be ready for them all. | |
582 | */ | |
583 | prefetchw (buf); | |
584 | count = readl (®s->ep_avail); | |
585 | if (unlikely (count == 0)) { | |
586 | udelay (1); | |
587 | tmp = readl (&ep->regs->ep_stat); | |
588 | count = readl (®s->ep_avail); | |
589 | /* handled that data already? */ | |
590 | if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0) | |
591 | return 0; | |
592 | } | |
593 | ||
594 | tmp = req->req.length - req->req.actual; | |
595 | if (count > tmp) { | |
596 | /* as with DMA, data overflow gets flushed */ | |
597 | if ((tmp % ep->ep.maxpacket) != 0) { | |
598 | ERROR (ep->dev, | |
599 | "%s out fifo %d bytes, expected %d\n", | |
600 | ep->ep.name, count, tmp); | |
601 | req->req.status = -EOVERFLOW; | |
602 | cleanup = 1; | |
603 | /* NAK_OUT_PACKETS will be set, so flushing is safe; | |
604 | * the next read will start with the next packet | |
605 | */ | |
606 | } /* else it's a ZLP, no worries */ | |
607 | count = tmp; | |
608 | } | |
609 | req->req.actual += count; | |
610 | ||
611 | is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0); | |
612 | ||
613 | VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n", | |
614 | ep->ep.name, count, is_short ? " (short)" : "", | |
615 | cleanup ? " flush" : "", prevent ? " nak" : "", | |
616 | req, req->req.actual, req->req.length); | |
617 | ||
618 | while (count >= 4) { | |
619 | tmp = readl (®s->ep_data); | |
620 | cpu_to_le32s (&tmp); | |
621 | put_unaligned (tmp, (u32 *)buf); | |
622 | buf += 4; | |
623 | count -= 4; | |
624 | } | |
625 | if (count) { | |
626 | tmp = readl (®s->ep_data); | |
627 | /* LE conversion is implicit here: */ | |
628 | do { | |
629 | *buf++ = (u8) tmp; | |
630 | tmp >>= 8; | |
631 | } while (--count); | |
632 | } | |
633 | if (cleanup) | |
634 | out_flush (ep); | |
635 | if (prevent) { | |
636 | writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp); | |
637 | (void) readl (&ep->regs->ep_rsp); | |
638 | } | |
639 | ||
640 | return is_short || ((req->req.actual == req->req.length) | |
641 | && !req->req.zero); | |
642 | } | |
643 | ||
644 | /* fill out dma descriptor to match a given request */ | |
645 | static void | |
646 | fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid) | |
647 | { | |
648 | struct net2280_dma *td = req->td; | |
649 | u32 dmacount = req->req.length; | |
650 | ||
651 | /* don't let DMA continue after a short OUT packet, | |
652 | * so overruns can't affect the next transfer. | |
653 | * in case of overruns on max-size packets, we can't | |
654 | * stop the fifo from filling but we can flush it. | |
655 | */ | |
656 | if (ep->is_in) | |
657 | dmacount |= (1 << DMA_DIRECTION); | |
901b3d75 DB |
658 | if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) |
659 | || ep->dev->pdev->device != 0x2280) | |
1da177e4 LT |
660 | dmacount |= (1 << END_OF_CHAIN); |
661 | ||
662 | req->valid = valid; | |
663 | if (valid) | |
664 | dmacount |= (1 << VALID_BIT); | |
665 | if (likely(!req->req.no_interrupt || !use_dma_chaining)) | |
666 | dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE); | |
667 | ||
668 | /* td->dmadesc = previously set by caller */ | |
669 | td->dmaaddr = cpu_to_le32 (req->req.dma); | |
670 | ||
671 | /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */ | |
672 | wmb (); | |
da2bbdcc | 673 | td->dmacount = cpu_to_le32(dmacount); |
1da177e4 LT |
674 | } |
675 | ||
676 | static const u32 dmactl_default = | |
677 | (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT) | |
678 | | (1 << DMA_CLEAR_COUNT_ENABLE) | |
679 | /* erratum 0116 workaround part 1 (use POLLING) */ | |
680 | | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) | |
681 | | (1 << DMA_VALID_BIT_POLLING_ENABLE) | |
682 | | (1 << DMA_VALID_BIT_ENABLE) | |
683 | | (1 << DMA_SCATTER_GATHER_ENABLE) | |
684 | /* erratum 0116 workaround part 2 (no AUTOSTART) */ | |
685 | | (1 << DMA_ENABLE); | |
686 | ||
687 | static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma) | |
688 | { | |
689 | handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50); | |
690 | } | |
691 | ||
692 | static inline void stop_dma (struct net2280_dma_regs __iomem *dma) | |
693 | { | |
694 | writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl); | |
695 | spin_stop_dma (dma); | |
696 | } | |
697 | ||
698 | static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma) | |
699 | { | |
700 | struct net2280_dma_regs __iomem *dma = ep->dma; | |
950ee4c8 | 701 | unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION); |
1da177e4 | 702 | |
950ee4c8 GL |
703 | if (ep->dev->pdev->device != 0x2280) |
704 | tmp |= (1 << END_OF_CHAIN); | |
705 | ||
706 | writel (tmp, &dma->dmacount); | |
1da177e4 LT |
707 | writel (readl (&dma->dmastat), &dma->dmastat); |
708 | ||
709 | writel (td_dma, &dma->dmadesc); | |
710 | writel (dmactl, &dma->dmactl); | |
711 | ||
712 | /* erratum 0116 workaround part 3: pci arbiter away from net2280 */ | |
713 | (void) readl (&ep->dev->pci->pcimstctl); | |
714 | ||
715 | writel ((1 << DMA_START), &dma->dmastat); | |
716 | ||
717 | if (!ep->is_in) | |
718 | stop_out_naking (ep); | |
719 | } | |
720 | ||
721 | static void start_dma (struct net2280_ep *ep, struct net2280_request *req) | |
722 | { | |
723 | u32 tmp; | |
724 | struct net2280_dma_regs __iomem *dma = ep->dma; | |
725 | ||
726 | /* FIXME can't use DMA for ZLPs */ | |
727 | ||
728 | /* on this path we "know" there's no dma active (yet) */ | |
729 | WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE)); | |
730 | writel (0, &ep->dma->dmactl); | |
731 | ||
732 | /* previous OUT packet might have been short */ | |
733 | if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat)) | |
901b3d75 | 734 | & (1 << NAK_OUT_PACKETS)) != 0) { |
1da177e4 LT |
735 | writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT), |
736 | &ep->regs->ep_stat); | |
737 | ||
738 | tmp = readl (&ep->regs->ep_avail); | |
739 | if (tmp) { | |
740 | writel (readl (&dma->dmastat), &dma->dmastat); | |
741 | ||
742 | /* transfer all/some fifo data */ | |
743 | writel (req->req.dma, &dma->dmaaddr); | |
744 | tmp = min (tmp, req->req.length); | |
745 | ||
746 | /* dma irq, faking scatterlist status */ | |
747 | req->td->dmacount = cpu_to_le32 (req->req.length - tmp); | |
748 | writel ((1 << DMA_DONE_INTERRUPT_ENABLE) | |
749 | | tmp, &dma->dmacount); | |
750 | req->td->dmadesc = 0; | |
751 | req->valid = 1; | |
752 | ||
753 | writel ((1 << DMA_ENABLE), &dma->dmactl); | |
754 | writel ((1 << DMA_START), &dma->dmastat); | |
755 | return; | |
756 | } | |
757 | } | |
758 | ||
759 | tmp = dmactl_default; | |
760 | ||
761 | /* force packet boundaries between dma requests, but prevent the | |
762 | * controller from automagically writing a last "short" packet | |
763 | * (zero length) unless the driver explicitly said to do that. | |
764 | */ | |
765 | if (ep->is_in) { | |
766 | if (likely ((req->req.length % ep->ep.maxpacket) != 0 | |
767 | || req->req.zero)) { | |
768 | tmp |= (1 << DMA_FIFO_VALIDATE); | |
769 | ep->in_fifo_validate = 1; | |
770 | } else | |
771 | ep->in_fifo_validate = 0; | |
772 | } | |
773 | ||
774 | /* init req->td, pointing to the current dummy */ | |
775 | req->td->dmadesc = cpu_to_le32 (ep->td_dma); | |
776 | fill_dma_desc (ep, req, 1); | |
777 | ||
778 | if (!use_dma_chaining) | |
551509d2 | 779 | req->td->dmacount |= cpu_to_le32 (1 << END_OF_CHAIN); |
1da177e4 LT |
780 | |
781 | start_queue (ep, tmp, req->td_dma); | |
782 | } | |
783 | ||
784 | static inline void | |
785 | queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid) | |
786 | { | |
787 | struct net2280_dma *end; | |
788 | dma_addr_t tmp; | |
789 | ||
790 | /* swap new dummy for old, link; fill and maybe activate */ | |
791 | end = ep->dummy; | |
792 | ep->dummy = req->td; | |
793 | req->td = end; | |
794 | ||
795 | tmp = ep->td_dma; | |
796 | ep->td_dma = req->td_dma; | |
797 | req->td_dma = tmp; | |
798 | ||
799 | end->dmadesc = cpu_to_le32 (ep->td_dma); | |
800 | ||
801 | fill_dma_desc (ep, req, valid); | |
802 | } | |
803 | ||
804 | static void | |
805 | done (struct net2280_ep *ep, struct net2280_request *req, int status) | |
806 | { | |
807 | struct net2280 *dev; | |
808 | unsigned stopped = ep->stopped; | |
809 | ||
810 | list_del_init (&req->queue); | |
811 | ||
812 | if (req->req.status == -EINPROGRESS) | |
813 | req->req.status = status; | |
814 | else | |
815 | status = req->req.status; | |
816 | ||
817 | dev = ep->dev; | |
818 | if (req->mapped) { | |
819 | pci_unmap_single (dev->pdev, req->req.dma, req->req.length, | |
820 | ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); | |
821 | req->req.dma = DMA_ADDR_INVALID; | |
822 | req->mapped = 0; | |
823 | } | |
824 | ||
825 | if (status && status != -ESHUTDOWN) | |
826 | VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n", | |
827 | ep->ep.name, &req->req, status, | |
828 | req->req.actual, req->req.length); | |
829 | ||
830 | /* don't modify queue heads during completion callback */ | |
831 | ep->stopped = 1; | |
832 | spin_unlock (&dev->lock); | |
833 | req->req.complete (&ep->ep, &req->req); | |
834 | spin_lock (&dev->lock); | |
835 | ep->stopped = stopped; | |
836 | } | |
837 | ||
838 | /*-------------------------------------------------------------------------*/ | |
839 | ||
840 | static int | |
55016f10 | 841 | net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) |
1da177e4 LT |
842 | { |
843 | struct net2280_request *req; | |
844 | struct net2280_ep *ep; | |
845 | struct net2280 *dev; | |
846 | unsigned long flags; | |
847 | ||
848 | /* we always require a cpu-view buffer, so that we can | |
849 | * always use pio (as fallback or whatever). | |
850 | */ | |
851 | req = container_of (_req, struct net2280_request, req); | |
852 | if (!_req || !_req->complete || !_req->buf | |
853 | || !list_empty (&req->queue)) | |
854 | return -EINVAL; | |
855 | if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) | |
856 | return -EDOM; | |
857 | ep = container_of (_ep, struct net2280_ep, ep); | |
858 | if (!_ep || (!ep->desc && ep->num != 0)) | |
859 | return -EINVAL; | |
860 | dev = ep->dev; | |
861 | if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) | |
862 | return -ESHUTDOWN; | |
863 | ||
864 | /* FIXME implement PIO fallback for ZLPs with DMA */ | |
865 | if (ep->dma && _req->length == 0) | |
866 | return -EOPNOTSUPP; | |
867 | ||
868 | /* set up dma mapping in case the caller didn't */ | |
869 | if (ep->dma && _req->dma == DMA_ADDR_INVALID) { | |
870 | _req->dma = pci_map_single (dev->pdev, _req->buf, _req->length, | |
871 | ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); | |
872 | req->mapped = 1; | |
873 | } | |
874 | ||
875 | #if 0 | |
876 | VDEBUG (dev, "%s queue req %p, len %d buf %p\n", | |
877 | _ep->name, _req, _req->length, _req->buf); | |
878 | #endif | |
879 | ||
880 | spin_lock_irqsave (&dev->lock, flags); | |
881 | ||
882 | _req->status = -EINPROGRESS; | |
883 | _req->actual = 0; | |
884 | ||
885 | /* kickstart this i/o queue? */ | |
886 | if (list_empty (&ep->queue) && !ep->stopped) { | |
887 | /* use DMA if the endpoint supports it, else pio */ | |
888 | if (ep->dma) | |
889 | start_dma (ep, req); | |
890 | else { | |
891 | /* maybe there's no control data, just status ack */ | |
892 | if (ep->num == 0 && _req->length == 0) { | |
893 | allow_status (ep); | |
894 | done (ep, req, 0); | |
895 | VDEBUG (dev, "%s status ack\n", ep->ep.name); | |
896 | goto done; | |
897 | } | |
898 | ||
899 | /* PIO ... stuff the fifo, or unblock it. */ | |
900 | if (ep->is_in) | |
901 | write_fifo (ep, _req); | |
902 | else if (list_empty (&ep->queue)) { | |
903 | u32 s; | |
904 | ||
905 | /* OUT FIFO might have packet(s) buffered */ | |
906 | s = readl (&ep->regs->ep_stat); | |
907 | if ((s & (1 << FIFO_EMPTY)) == 0) { | |
908 | /* note: _req->short_not_ok is | |
909 | * ignored here since PIO _always_ | |
910 | * stops queue advance here, and | |
911 | * _req->status doesn't change for | |
912 | * short reads (only _req->actual) | |
913 | */ | |
914 | if (read_fifo (ep, req)) { | |
915 | done (ep, req, 0); | |
916 | if (ep->num == 0) | |
917 | allow_status (ep); | |
918 | /* don't queue it */ | |
919 | req = NULL; | |
920 | } else | |
921 | s = readl (&ep->regs->ep_stat); | |
922 | } | |
923 | ||
924 | /* don't NAK, let the fifo fill */ | |
925 | if (req && (s & (1 << NAK_OUT_PACKETS))) | |
926 | writel ((1 << CLEAR_NAK_OUT_PACKETS), | |
927 | &ep->regs->ep_rsp); | |
928 | } | |
929 | } | |
930 | ||
931 | } else if (ep->dma) { | |
932 | int valid = 1; | |
933 | ||
934 | if (ep->is_in) { | |
935 | int expect; | |
936 | ||
937 | /* preventing magic zlps is per-engine state, not | |
938 | * per-transfer; irq logic must recover hiccups. | |
939 | */ | |
940 | expect = likely (req->req.zero | |
941 | || (req->req.length % ep->ep.maxpacket) != 0); | |
942 | if (expect != ep->in_fifo_validate) | |
943 | valid = 0; | |
944 | } | |
945 | queue_dma (ep, req, valid); | |
946 | ||
947 | } /* else the irq handler advances the queue. */ | |
948 | ||
1f26e28d | 949 | ep->responded = 1; |
1da177e4 LT |
950 | if (req) |
951 | list_add_tail (&req->queue, &ep->queue); | |
952 | done: | |
953 | spin_unlock_irqrestore (&dev->lock, flags); | |
954 | ||
955 | /* pci writes may still be posted */ | |
956 | return 0; | |
957 | } | |
958 | ||
959 | static inline void | |
960 | dma_done ( | |
961 | struct net2280_ep *ep, | |
962 | struct net2280_request *req, | |
963 | u32 dmacount, | |
964 | int status | |
965 | ) | |
966 | { | |
967 | req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount); | |
968 | done (ep, req, status); | |
969 | } | |
970 | ||
971 | static void restart_dma (struct net2280_ep *ep); | |
972 | ||
973 | static void scan_dma_completions (struct net2280_ep *ep) | |
974 | { | |
975 | /* only look at descriptors that were "naturally" retired, | |
976 | * so fifo and list head state won't matter | |
977 | */ | |
978 | while (!list_empty (&ep->queue)) { | |
979 | struct net2280_request *req; | |
980 | u32 tmp; | |
981 | ||
982 | req = list_entry (ep->queue.next, | |
983 | struct net2280_request, queue); | |
984 | if (!req->valid) | |
985 | break; | |
986 | rmb (); | |
987 | tmp = le32_to_cpup (&req->td->dmacount); | |
988 | if ((tmp & (1 << VALID_BIT)) != 0) | |
989 | break; | |
990 | ||
991 | /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short" | |
992 | * cases where DMA must be aborted; this code handles | |
993 | * all non-abort DMA completions. | |
994 | */ | |
995 | if (unlikely (req->td->dmadesc == 0)) { | |
996 | /* paranoia */ | |
997 | tmp = readl (&ep->dma->dmacount); | |
998 | if (tmp & DMA_BYTE_COUNT_MASK) | |
999 | break; | |
1000 | /* single transfer mode */ | |
1001 | dma_done (ep, req, tmp, 0); | |
1002 | break; | |
1003 | } else if (!ep->is_in | |
1004 | && (req->req.length % ep->ep.maxpacket) != 0) { | |
1005 | tmp = readl (&ep->regs->ep_stat); | |
1006 | ||
1007 | /* AVOID TROUBLE HERE by not issuing short reads from | |
1008 | * your gadget driver. That helps avoids errata 0121, | |
1009 | * 0122, and 0124; not all cases trigger the warning. | |
1010 | */ | |
1011 | if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) { | |
b6c63937 | 1012 | WARNING (ep->dev, "%s lost packet sync!\n", |
1da177e4 LT |
1013 | ep->ep.name); |
1014 | req->req.status = -EOVERFLOW; | |
1015 | } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) { | |
1016 | /* fifo gets flushed later */ | |
1017 | ep->out_overflow = 1; | |
1018 | DEBUG (ep->dev, "%s dma, discard %d len %d\n", | |
1019 | ep->ep.name, tmp, | |
1020 | req->req.length); | |
1021 | req->req.status = -EOVERFLOW; | |
1022 | } | |
1023 | } | |
1024 | dma_done (ep, req, tmp, 0); | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | static void restart_dma (struct net2280_ep *ep) | |
1029 | { | |
1030 | struct net2280_request *req; | |
1031 | u32 dmactl = dmactl_default; | |
1032 | ||
1033 | if (ep->stopped) | |
1034 | return; | |
1035 | req = list_entry (ep->queue.next, struct net2280_request, queue); | |
1036 | ||
1037 | if (!use_dma_chaining) { | |
1038 | start_dma (ep, req); | |
1039 | return; | |
1040 | } | |
1041 | ||
1042 | /* the 2280 will be processing the queue unless queue hiccups after | |
1043 | * the previous transfer: | |
1044 | * IN: wanted automagic zlp, head doesn't (or vice versa) | |
1045 | * DMA_FIFO_VALIDATE doesn't init from dma descriptors. | |
1046 | * OUT: was "usb-short", we must restart. | |
1047 | */ | |
1048 | if (ep->is_in && !req->valid) { | |
1049 | struct net2280_request *entry, *prev = NULL; | |
1050 | int reqmode, done = 0; | |
1051 | ||
1052 | DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td); | |
1053 | ep->in_fifo_validate = likely (req->req.zero | |
1054 | || (req->req.length % ep->ep.maxpacket) != 0); | |
1055 | if (ep->in_fifo_validate) | |
1056 | dmactl |= (1 << DMA_FIFO_VALIDATE); | |
1057 | list_for_each_entry (entry, &ep->queue, queue) { | |
320f3459 | 1058 | __le32 dmacount; |
1da177e4 LT |
1059 | |
1060 | if (entry == req) | |
1061 | continue; | |
1062 | dmacount = entry->td->dmacount; | |
1063 | if (!done) { | |
1064 | reqmode = likely (entry->req.zero | |
1065 | || (entry->req.length | |
1066 | % ep->ep.maxpacket) != 0); | |
1067 | if (reqmode == ep->in_fifo_validate) { | |
1068 | entry->valid = 1; | |
1069 | dmacount |= valid_bit; | |
1070 | entry->td->dmacount = dmacount; | |
1071 | prev = entry; | |
1072 | continue; | |
1073 | } else { | |
1074 | /* force a hiccup */ | |
1075 | prev->td->dmacount |= dma_done_ie; | |
1076 | done = 1; | |
1077 | } | |
1078 | } | |
1079 | ||
1080 | /* walk the rest of the queue so unlinks behave */ | |
1081 | entry->valid = 0; | |
1082 | dmacount &= ~valid_bit; | |
1083 | entry->td->dmacount = dmacount; | |
1084 | prev = entry; | |
1085 | } | |
1086 | } | |
1087 | ||
1088 | writel (0, &ep->dma->dmactl); | |
1089 | start_queue (ep, dmactl, req->td_dma); | |
1090 | } | |
1091 | ||
1092 | static void abort_dma (struct net2280_ep *ep) | |
1093 | { | |
1094 | /* abort the current transfer */ | |
1095 | if (likely (!list_empty (&ep->queue))) { | |
1096 | /* FIXME work around errata 0121, 0122, 0124 */ | |
1097 | writel ((1 << DMA_ABORT), &ep->dma->dmastat); | |
1098 | spin_stop_dma (ep->dma); | |
1099 | } else | |
1100 | stop_dma (ep->dma); | |
1101 | scan_dma_completions (ep); | |
1102 | } | |
1103 | ||
1104 | /* dequeue ALL requests */ | |
1105 | static void nuke (struct net2280_ep *ep) | |
1106 | { | |
1107 | struct net2280_request *req; | |
1108 | ||
1109 | /* called with spinlock held */ | |
1110 | ep->stopped = 1; | |
1111 | if (ep->dma) | |
1112 | abort_dma (ep); | |
1113 | while (!list_empty (&ep->queue)) { | |
1114 | req = list_entry (ep->queue.next, | |
1115 | struct net2280_request, | |
1116 | queue); | |
1117 | done (ep, req, -ESHUTDOWN); | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | /* dequeue JUST ONE request */ | |
1122 | static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req) | |
1123 | { | |
1124 | struct net2280_ep *ep; | |
1125 | struct net2280_request *req; | |
1126 | unsigned long flags; | |
1127 | u32 dmactl; | |
1128 | int stopped; | |
1129 | ||
1130 | ep = container_of (_ep, struct net2280_ep, ep); | |
1131 | if (!_ep || (!ep->desc && ep->num != 0) || !_req) | |
1132 | return -EINVAL; | |
1133 | ||
1134 | spin_lock_irqsave (&ep->dev->lock, flags); | |
1135 | stopped = ep->stopped; | |
1136 | ||
1137 | /* quiesce dma while we patch the queue */ | |
1138 | dmactl = 0; | |
1139 | ep->stopped = 1; | |
1140 | if (ep->dma) { | |
1141 | dmactl = readl (&ep->dma->dmactl); | |
1142 | /* WARNING erratum 0127 may kick in ... */ | |
1143 | stop_dma (ep->dma); | |
1144 | scan_dma_completions (ep); | |
1145 | } | |
1146 | ||
1147 | /* make sure it's still queued on this endpoint */ | |
1148 | list_for_each_entry (req, &ep->queue, queue) { | |
1149 | if (&req->req == _req) | |
1150 | break; | |
1151 | } | |
1152 | if (&req->req != _req) { | |
1153 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
1154 | return -EINVAL; | |
1155 | } | |
1156 | ||
1157 | /* queue head may be partially complete. */ | |
1158 | if (ep->queue.next == &req->queue) { | |
1159 | if (ep->dma) { | |
1160 | DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name); | |
1161 | _req->status = -ECONNRESET; | |
1162 | abort_dma (ep); | |
1163 | if (likely (ep->queue.next == &req->queue)) { | |
1164 | // NOTE: misreports single-transfer mode | |
1165 | req->td->dmacount = 0; /* invalidate */ | |
1166 | dma_done (ep, req, | |
1167 | readl (&ep->dma->dmacount), | |
1168 | -ECONNRESET); | |
1169 | } | |
1170 | } else { | |
1171 | DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name); | |
1172 | done (ep, req, -ECONNRESET); | |
1173 | } | |
1174 | req = NULL; | |
1175 | ||
1176 | /* patch up hardware chaining data */ | |
1177 | } else if (ep->dma && use_dma_chaining) { | |
1178 | if (req->queue.prev == ep->queue.next) { | |
1179 | writel (le32_to_cpu (req->td->dmadesc), | |
1180 | &ep->dma->dmadesc); | |
1181 | if (req->td->dmacount & dma_done_ie) | |
1182 | writel (readl (&ep->dma->dmacount) | |
320f3459 | 1183 | | le32_to_cpu(dma_done_ie), |
1da177e4 LT |
1184 | &ep->dma->dmacount); |
1185 | } else { | |
1186 | struct net2280_request *prev; | |
1187 | ||
1188 | prev = list_entry (req->queue.prev, | |
1189 | struct net2280_request, queue); | |
1190 | prev->td->dmadesc = req->td->dmadesc; | |
1191 | if (req->td->dmacount & dma_done_ie) | |
1192 | prev->td->dmacount |= dma_done_ie; | |
1193 | } | |
1194 | } | |
1195 | ||
1196 | if (req) | |
1197 | done (ep, req, -ECONNRESET); | |
1198 | ep->stopped = stopped; | |
1199 | ||
1200 | if (ep->dma) { | |
1201 | /* turn off dma on inactive queues */ | |
1202 | if (list_empty (&ep->queue)) | |
1203 | stop_dma (ep->dma); | |
1204 | else if (!ep->stopped) { | |
1205 | /* resume current request, or start new one */ | |
1206 | if (req) | |
1207 | writel (dmactl, &ep->dma->dmactl); | |
1208 | else | |
1209 | start_dma (ep, list_entry (ep->queue.next, | |
1210 | struct net2280_request, queue)); | |
1211 | } | |
1212 | } | |
1213 | ||
1214 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | /*-------------------------------------------------------------------------*/ | |
1219 | ||
1220 | static int net2280_fifo_status (struct usb_ep *_ep); | |
1221 | ||
1222 | static int | |
8066134f | 1223 | net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) |
1da177e4 LT |
1224 | { |
1225 | struct net2280_ep *ep; | |
1226 | unsigned long flags; | |
1227 | int retval = 0; | |
1228 | ||
1229 | ep = container_of (_ep, struct net2280_ep, ep); | |
1230 | if (!_ep || (!ep->desc && ep->num != 0)) | |
1231 | return -EINVAL; | |
1232 | if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1233 | return -ESHUTDOWN; | |
1234 | if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03) | |
1235 | == USB_ENDPOINT_XFER_ISOC) | |
1236 | return -EINVAL; | |
1237 | ||
1238 | spin_lock_irqsave (&ep->dev->lock, flags); | |
1239 | if (!list_empty (&ep->queue)) | |
1240 | retval = -EAGAIN; | |
1241 | else if (ep->is_in && value && net2280_fifo_status (_ep) != 0) | |
1242 | retval = -EAGAIN; | |
1243 | else { | |
8066134f AS |
1244 | VDEBUG (ep->dev, "%s %s %s\n", _ep->name, |
1245 | value ? "set" : "clear", | |
1246 | wedged ? "wedge" : "halt"); | |
1da177e4 LT |
1247 | /* set/clear, then synch memory views with the device */ |
1248 | if (value) { | |
1249 | if (ep->num == 0) | |
1250 | ep->dev->protocol_stall = 1; | |
1251 | else | |
1252 | set_halt (ep); | |
8066134f AS |
1253 | if (wedged) |
1254 | ep->wedged = 1; | |
1255 | } else { | |
1da177e4 | 1256 | clear_halt (ep); |
8066134f AS |
1257 | ep->wedged = 0; |
1258 | } | |
1da177e4 LT |
1259 | (void) readl (&ep->regs->ep_rsp); |
1260 | } | |
1261 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
1262 | ||
1263 | return retval; | |
1264 | } | |
1265 | ||
8066134f AS |
1266 | static int |
1267 | net2280_set_halt(struct usb_ep *_ep, int value) | |
1268 | { | |
1269 | return net2280_set_halt_and_wedge(_ep, value, 0); | |
1270 | } | |
1271 | ||
1272 | static int | |
1273 | net2280_set_wedge(struct usb_ep *_ep) | |
1274 | { | |
1275 | if (!_ep || _ep->name == ep0name) | |
1276 | return -EINVAL; | |
1277 | return net2280_set_halt_and_wedge(_ep, 1, 1); | |
1278 | } | |
1279 | ||
1da177e4 LT |
1280 | static int |
1281 | net2280_fifo_status (struct usb_ep *_ep) | |
1282 | { | |
1283 | struct net2280_ep *ep; | |
1284 | u32 avail; | |
1285 | ||
1286 | ep = container_of (_ep, struct net2280_ep, ep); | |
1287 | if (!_ep || (!ep->desc && ep->num != 0)) | |
1288 | return -ENODEV; | |
1289 | if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1290 | return -ESHUTDOWN; | |
1291 | ||
1292 | avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1); | |
1293 | if (avail > ep->fifo_size) | |
1294 | return -EOVERFLOW; | |
1295 | if (ep->is_in) | |
1296 | avail = ep->fifo_size - avail; | |
1297 | return avail; | |
1298 | } | |
1299 | ||
1300 | static void | |
1301 | net2280_fifo_flush (struct usb_ep *_ep) | |
1302 | { | |
1303 | struct net2280_ep *ep; | |
1304 | ||
1305 | ep = container_of (_ep, struct net2280_ep, ep); | |
1306 | if (!_ep || (!ep->desc && ep->num != 0)) | |
1307 | return; | |
1308 | if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1309 | return; | |
1310 | ||
1311 | writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat); | |
1312 | (void) readl (&ep->regs->ep_rsp); | |
1313 | } | |
1314 | ||
901b3d75 | 1315 | static const struct usb_ep_ops net2280_ep_ops = { |
1da177e4 LT |
1316 | .enable = net2280_enable, |
1317 | .disable = net2280_disable, | |
1318 | ||
1319 | .alloc_request = net2280_alloc_request, | |
1320 | .free_request = net2280_free_request, | |
1321 | ||
1da177e4 LT |
1322 | .queue = net2280_queue, |
1323 | .dequeue = net2280_dequeue, | |
1324 | ||
1325 | .set_halt = net2280_set_halt, | |
8066134f | 1326 | .set_wedge = net2280_set_wedge, |
1da177e4 LT |
1327 | .fifo_status = net2280_fifo_status, |
1328 | .fifo_flush = net2280_fifo_flush, | |
1329 | }; | |
1330 | ||
1331 | /*-------------------------------------------------------------------------*/ | |
1332 | ||
1333 | static int net2280_get_frame (struct usb_gadget *_gadget) | |
1334 | { | |
1335 | struct net2280 *dev; | |
1336 | unsigned long flags; | |
1337 | u16 retval; | |
1338 | ||
1339 | if (!_gadget) | |
1340 | return -ENODEV; | |
1341 | dev = container_of (_gadget, struct net2280, gadget); | |
1342 | spin_lock_irqsave (&dev->lock, flags); | |
1343 | retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff; | |
1344 | spin_unlock_irqrestore (&dev->lock, flags); | |
1345 | return retval; | |
1346 | } | |
1347 | ||
1348 | static int net2280_wakeup (struct usb_gadget *_gadget) | |
1349 | { | |
1350 | struct net2280 *dev; | |
1351 | u32 tmp; | |
1352 | unsigned long flags; | |
1353 | ||
1354 | if (!_gadget) | |
1355 | return 0; | |
1356 | dev = container_of (_gadget, struct net2280, gadget); | |
1357 | ||
1358 | spin_lock_irqsave (&dev->lock, flags); | |
1359 | tmp = readl (&dev->usb->usbctl); | |
1360 | if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE)) | |
1361 | writel (1 << GENERATE_RESUME, &dev->usb->usbstat); | |
1362 | spin_unlock_irqrestore (&dev->lock, flags); | |
1363 | ||
1364 | /* pci writes may still be posted */ | |
1365 | return 0; | |
1366 | } | |
1367 | ||
1368 | static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value) | |
1369 | { | |
1370 | struct net2280 *dev; | |
1371 | u32 tmp; | |
1372 | unsigned long flags; | |
1373 | ||
1374 | if (!_gadget) | |
1375 | return 0; | |
1376 | dev = container_of (_gadget, struct net2280, gadget); | |
1377 | ||
1378 | spin_lock_irqsave (&dev->lock, flags); | |
1379 | tmp = readl (&dev->usb->usbctl); | |
1380 | if (value) | |
1381 | tmp |= (1 << SELF_POWERED_STATUS); | |
1382 | else | |
1383 | tmp &= ~(1 << SELF_POWERED_STATUS); | |
1384 | writel (tmp, &dev->usb->usbctl); | |
1385 | spin_unlock_irqrestore (&dev->lock, flags); | |
1386 | ||
1387 | return 0; | |
1388 | } | |
1389 | ||
1390 | static int net2280_pullup(struct usb_gadget *_gadget, int is_on) | |
1391 | { | |
1392 | struct net2280 *dev; | |
1393 | u32 tmp; | |
1394 | unsigned long flags; | |
1395 | ||
1396 | if (!_gadget) | |
1397 | return -ENODEV; | |
1398 | dev = container_of (_gadget, struct net2280, gadget); | |
1399 | ||
1400 | spin_lock_irqsave (&dev->lock, flags); | |
1401 | tmp = readl (&dev->usb->usbctl); | |
1402 | dev->softconnect = (is_on != 0); | |
1403 | if (is_on) | |
1404 | tmp |= (1 << USB_DETECT_ENABLE); | |
1405 | else | |
1406 | tmp &= ~(1 << USB_DETECT_ENABLE); | |
1407 | writel (tmp, &dev->usb->usbctl); | |
1408 | spin_unlock_irqrestore (&dev->lock, flags); | |
1409 | ||
1410 | return 0; | |
1411 | } | |
1412 | ||
0f91349b SAS |
1413 | static int net2280_start(struct usb_gadget_driver *driver, |
1414 | int (*bind)(struct usb_gadget *)); | |
1415 | static int net2280_stop(struct usb_gadget_driver *driver); | |
1416 | ||
1da177e4 LT |
1417 | static const struct usb_gadget_ops net2280_ops = { |
1418 | .get_frame = net2280_get_frame, | |
1419 | .wakeup = net2280_wakeup, | |
1420 | .set_selfpowered = net2280_set_selfpowered, | |
1421 | .pullup = net2280_pullup, | |
0f91349b SAS |
1422 | .start = net2280_start, |
1423 | .stop = net2280_stop, | |
1da177e4 LT |
1424 | }; |
1425 | ||
1426 | /*-------------------------------------------------------------------------*/ | |
1427 | ||
1428 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES | |
1429 | ||
1430 | /* FIXME move these into procfs, and use seq_file. | |
1431 | * Sysfs _still_ doesn't behave for arbitrarily sized files, | |
1432 | * and also doesn't help products using this with 2.4 kernels. | |
1433 | */ | |
1434 | ||
1435 | /* "function" sysfs attribute */ | |
1436 | static ssize_t | |
10523b3b | 1437 | show_function (struct device *_dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
1438 | { |
1439 | struct net2280 *dev = dev_get_drvdata (_dev); | |
1440 | ||
1441 | if (!dev->driver | |
1442 | || !dev->driver->function | |
1443 | || strlen (dev->driver->function) > PAGE_SIZE) | |
1444 | return 0; | |
1445 | return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function); | |
1446 | } | |
1447 | static DEVICE_ATTR (function, S_IRUGO, show_function, NULL); | |
1448 | ||
62fb44b9 DH |
1449 | static ssize_t net2280_show_registers(struct device *_dev, |
1450 | struct device_attribute *attr, char *buf) | |
1da177e4 LT |
1451 | { |
1452 | struct net2280 *dev; | |
1453 | char *next; | |
1454 | unsigned size, t; | |
1455 | unsigned long flags; | |
1456 | int i; | |
1457 | u32 t1, t2; | |
30e69598 | 1458 | const char *s; |
1da177e4 LT |
1459 | |
1460 | dev = dev_get_drvdata (_dev); | |
1461 | next = buf; | |
1462 | size = PAGE_SIZE; | |
1463 | spin_lock_irqsave (&dev->lock, flags); | |
1464 | ||
1465 | if (dev->driver) | |
1466 | s = dev->driver->driver.name; | |
1467 | else | |
1468 | s = "(none)"; | |
1469 | ||
1470 | /* Main Control Registers */ | |
1471 | t = scnprintf (next, size, "%s version " DRIVER_VERSION | |
1472 | ", chiprev %04x, dma %s\n\n" | |
1473 | "devinit %03x fifoctl %08x gadget '%s'\n" | |
1474 | "pci irqenb0 %02x irqenb1 %08x " | |
1475 | "irqstat0 %04x irqstat1 %08x\n", | |
1476 | driver_name, dev->chiprev, | |
1477 | use_dma | |
1478 | ? (use_dma_chaining ? "chaining" : "enabled") | |
1479 | : "disabled", | |
1480 | readl (&dev->regs->devinit), | |
1481 | readl (&dev->regs->fifoctl), | |
1482 | s, | |
1483 | readl (&dev->regs->pciirqenb0), | |
1484 | readl (&dev->regs->pciirqenb1), | |
1485 | readl (&dev->regs->irqstat0), | |
1486 | readl (&dev->regs->irqstat1)); | |
1487 | size -= t; | |
1488 | next += t; | |
1489 | ||
1490 | /* USB Control Registers */ | |
1491 | t1 = readl (&dev->usb->usbctl); | |
1492 | t2 = readl (&dev->usb->usbstat); | |
1493 | if (t1 & (1 << VBUS_PIN)) { | |
1494 | if (t2 & (1 << HIGH_SPEED)) | |
1495 | s = "high speed"; | |
1496 | else if (dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1497 | s = "powered"; | |
1498 | else | |
1499 | s = "full speed"; | |
1500 | /* full speed bit (6) not working?? */ | |
1501 | } else | |
1502 | s = "not attached"; | |
1503 | t = scnprintf (next, size, | |
1504 | "stdrsp %08x usbctl %08x usbstat %08x " | |
1505 | "addr 0x%02x (%s)\n", | |
1506 | readl (&dev->usb->stdrsp), t1, t2, | |
1507 | readl (&dev->usb->ouraddr), s); | |
1508 | size -= t; | |
1509 | next += t; | |
1510 | ||
1511 | /* PCI Master Control Registers */ | |
1512 | ||
1513 | /* DMA Control Registers */ | |
1514 | ||
1515 | /* Configurable EP Control Registers */ | |
1516 | for (i = 0; i < 7; i++) { | |
1517 | struct net2280_ep *ep; | |
1518 | ||
1519 | ep = &dev->ep [i]; | |
1520 | if (i && !ep->desc) | |
1521 | continue; | |
1522 | ||
1523 | t1 = readl (&ep->regs->ep_cfg); | |
1524 | t2 = readl (&ep->regs->ep_rsp) & 0xff; | |
1525 | t = scnprintf (next, size, | |
1526 | "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s" | |
1527 | "irqenb %02x\n", | |
1528 | ep->ep.name, t1, t2, | |
1529 | (t2 & (1 << CLEAR_NAK_OUT_PACKETS)) | |
1530 | ? "NAK " : "", | |
1531 | (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE)) | |
1532 | ? "hide " : "", | |
1533 | (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR)) | |
1534 | ? "CRC " : "", | |
1535 | (t2 & (1 << CLEAR_INTERRUPT_MODE)) | |
1536 | ? "interrupt " : "", | |
1537 | (t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)) | |
1538 | ? "status " : "", | |
1539 | (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE)) | |
1540 | ? "NAKmode " : "", | |
1541 | (t2 & (1 << CLEAR_ENDPOINT_TOGGLE)) | |
1542 | ? "DATA1 " : "DATA0 ", | |
1543 | (t2 & (1 << CLEAR_ENDPOINT_HALT)) | |
1544 | ? "HALT " : "", | |
1545 | readl (&ep->regs->ep_irqenb)); | |
1546 | size -= t; | |
1547 | next += t; | |
1548 | ||
1549 | t = scnprintf (next, size, | |
1550 | "\tstat %08x avail %04x " | |
1551 | "(ep%d%s-%s)%s\n", | |
1552 | readl (&ep->regs->ep_stat), | |
1553 | readl (&ep->regs->ep_avail), | |
1554 | t1 & 0x0f, DIR_STRING (t1), | |
1555 | type_string (t1 >> 8), | |
1556 | ep->stopped ? "*" : ""); | |
1557 | size -= t; | |
1558 | next += t; | |
1559 | ||
1560 | if (!ep->dma) | |
1561 | continue; | |
1562 | ||
1563 | t = scnprintf (next, size, | |
1564 | " dma\tctl %08x stat %08x count %08x\n" | |
1565 | "\taddr %08x desc %08x\n", | |
1566 | readl (&ep->dma->dmactl), | |
1567 | readl (&ep->dma->dmastat), | |
1568 | readl (&ep->dma->dmacount), | |
1569 | readl (&ep->dma->dmaaddr), | |
1570 | readl (&ep->dma->dmadesc)); | |
1571 | size -= t; | |
1572 | next += t; | |
1573 | ||
1574 | } | |
1575 | ||
1576 | /* Indexed Registers */ | |
901b3d75 | 1577 | // none yet |
1da177e4 LT |
1578 | |
1579 | /* Statistics */ | |
1580 | t = scnprintf (next, size, "\nirqs: "); | |
1581 | size -= t; | |
1582 | next += t; | |
1583 | for (i = 0; i < 7; i++) { | |
1584 | struct net2280_ep *ep; | |
1585 | ||
1586 | ep = &dev->ep [i]; | |
1587 | if (i && !ep->irqs) | |
1588 | continue; | |
1589 | t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs); | |
1590 | size -= t; | |
1591 | next += t; | |
1592 | ||
1593 | } | |
1594 | t = scnprintf (next, size, "\n"); | |
1595 | size -= t; | |
1596 | next += t; | |
1597 | ||
1598 | spin_unlock_irqrestore (&dev->lock, flags); | |
1599 | ||
1600 | return PAGE_SIZE - size; | |
1601 | } | |
62fb44b9 | 1602 | static DEVICE_ATTR(registers, S_IRUGO, net2280_show_registers, NULL); |
1da177e4 LT |
1603 | |
1604 | static ssize_t | |
10523b3b | 1605 | show_queues (struct device *_dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
1606 | { |
1607 | struct net2280 *dev; | |
1608 | char *next; | |
1609 | unsigned size; | |
1610 | unsigned long flags; | |
1611 | int i; | |
1612 | ||
1613 | dev = dev_get_drvdata (_dev); | |
1614 | next = buf; | |
1615 | size = PAGE_SIZE; | |
1616 | spin_lock_irqsave (&dev->lock, flags); | |
1617 | ||
1618 | for (i = 0; i < 7; i++) { | |
1619 | struct net2280_ep *ep = &dev->ep [i]; | |
1620 | struct net2280_request *req; | |
1621 | int t; | |
1622 | ||
1623 | if (i != 0) { | |
1624 | const struct usb_endpoint_descriptor *d; | |
1625 | ||
1626 | d = ep->desc; | |
1627 | if (!d) | |
1628 | continue; | |
1629 | t = d->bEndpointAddress; | |
1630 | t = scnprintf (next, size, | |
1631 | "\n%s (ep%d%s-%s) max %04x %s fifo %d\n", | |
1632 | ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK, | |
1633 | (t & USB_DIR_IN) ? "in" : "out", | |
1634 | ({ char *val; | |
1635 | switch (d->bmAttributes & 0x03) { | |
1636 | case USB_ENDPOINT_XFER_BULK: | |
901b3d75 | 1637 | val = "bulk"; break; |
1da177e4 | 1638 | case USB_ENDPOINT_XFER_INT: |
901b3d75 | 1639 | val = "intr"; break; |
1da177e4 | 1640 | default: |
901b3d75 | 1641 | val = "iso"; break; |
1da177e4 LT |
1642 | }; val; }), |
1643 | le16_to_cpu (d->wMaxPacketSize) & 0x1fff, | |
1644 | ep->dma ? "dma" : "pio", ep->fifo_size | |
1645 | ); | |
1646 | } else /* ep0 should only have one transfer queued */ | |
1647 | t = scnprintf (next, size, "ep0 max 64 pio %s\n", | |
1648 | ep->is_in ? "in" : "out"); | |
1649 | if (t <= 0 || t > size) | |
1650 | goto done; | |
1651 | size -= t; | |
1652 | next += t; | |
1653 | ||
1654 | if (list_empty (&ep->queue)) { | |
1655 | t = scnprintf (next, size, "\t(nothing queued)\n"); | |
1656 | if (t <= 0 || t > size) | |
1657 | goto done; | |
1658 | size -= t; | |
1659 | next += t; | |
1660 | continue; | |
1661 | } | |
1662 | list_for_each_entry (req, &ep->queue, queue) { | |
1663 | if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc)) | |
1664 | t = scnprintf (next, size, | |
1665 | "\treq %p len %d/%d " | |
1666 | "buf %p (dmacount %08x)\n", | |
1667 | &req->req, req->req.actual, | |
1668 | req->req.length, req->req.buf, | |
1669 | readl (&ep->dma->dmacount)); | |
1670 | else | |
1671 | t = scnprintf (next, size, | |
1672 | "\treq %p len %d/%d buf %p\n", | |
1673 | &req->req, req->req.actual, | |
1674 | req->req.length, req->req.buf); | |
1675 | if (t <= 0 || t > size) | |
1676 | goto done; | |
1677 | size -= t; | |
1678 | next += t; | |
1679 | ||
1680 | if (ep->dma) { | |
1681 | struct net2280_dma *td; | |
1682 | ||
1683 | td = req->td; | |
1684 | t = scnprintf (next, size, "\t td %08x " | |
1685 | " count %08x buf %08x desc %08x\n", | |
1686 | (u32) req->td_dma, | |
1687 | le32_to_cpu (td->dmacount), | |
1688 | le32_to_cpu (td->dmaaddr), | |
1689 | le32_to_cpu (td->dmadesc)); | |
1690 | if (t <= 0 || t > size) | |
1691 | goto done; | |
1692 | size -= t; | |
1693 | next += t; | |
1694 | } | |
1695 | } | |
1696 | } | |
1697 | ||
1698 | done: | |
1699 | spin_unlock_irqrestore (&dev->lock, flags); | |
1700 | return PAGE_SIZE - size; | |
1701 | } | |
1702 | static DEVICE_ATTR (queues, S_IRUGO, show_queues, NULL); | |
1703 | ||
1704 | ||
1705 | #else | |
1706 | ||
9950421c LT |
1707 | #define device_create_file(a,b) (0) |
1708 | #define device_remove_file(a,b) do { } while (0) | |
1da177e4 LT |
1709 | |
1710 | #endif | |
1711 | ||
1712 | /*-------------------------------------------------------------------------*/ | |
1713 | ||
1714 | /* another driver-specific mode might be a request type doing dma | |
1715 | * to/from another device fifo instead of to/from memory. | |
1716 | */ | |
1717 | ||
1718 | static void set_fifo_mode (struct net2280 *dev, int mode) | |
1719 | { | |
1720 | /* keeping high bits preserves BAR2 */ | |
1721 | writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl); | |
1722 | ||
1723 | /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */ | |
1724 | INIT_LIST_HEAD (&dev->gadget.ep_list); | |
1725 | list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list); | |
1726 | list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list); | |
1727 | switch (mode) { | |
1728 | case 0: | |
1729 | list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list); | |
1730 | list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list); | |
1731 | dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024; | |
1732 | break; | |
1733 | case 1: | |
1734 | dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048; | |
1735 | break; | |
1736 | case 2: | |
1737 | list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list); | |
1738 | dev->ep [1].fifo_size = 2048; | |
1739 | dev->ep [2].fifo_size = 1024; | |
1740 | break; | |
1741 | } | |
1742 | /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */ | |
1743 | list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list); | |
1744 | list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list); | |
1745 | } | |
1746 | ||
1da177e4 LT |
1747 | /* keeping it simple: |
1748 | * - one bus driver, initted first; | |
1749 | * - one function driver, initted second | |
1750 | * | |
1751 | * most of the work to support multiple net2280 controllers would | |
1752 | * be to associate this gadget driver (yes?) with all of them, or | |
1753 | * perhaps to bind specific drivers to specific devices. | |
1754 | */ | |
1755 | ||
1756 | static struct net2280 *the_controller; | |
1757 | ||
1758 | static void usb_reset (struct net2280 *dev) | |
1759 | { | |
1760 | u32 tmp; | |
1761 | ||
1762 | dev->gadget.speed = USB_SPEED_UNKNOWN; | |
1763 | (void) readl (&dev->usb->usbctl); | |
1764 | ||
1765 | net2280_led_init (dev); | |
1766 | ||
1767 | /* disable automatic responses, and irqs */ | |
1768 | writel (0, &dev->usb->stdrsp); | |
1769 | writel (0, &dev->regs->pciirqenb0); | |
1770 | writel (0, &dev->regs->pciirqenb1); | |
1771 | ||
1772 | /* clear old dma and irq state */ | |
1773 | for (tmp = 0; tmp < 4; tmp++) { | |
1774 | struct net2280_ep *ep = &dev->ep [tmp + 1]; | |
1775 | ||
1776 | if (ep->dma) | |
1777 | abort_dma (ep); | |
1778 | } | |
1779 | writel (~0, &dev->regs->irqstat0), | |
1780 | writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1), | |
1781 | ||
1782 | /* reset, and enable pci */ | |
1783 | tmp = readl (&dev->regs->devinit) | |
1784 | | (1 << PCI_ENABLE) | |
1785 | | (1 << FIFO_SOFT_RESET) | |
1786 | | (1 << USB_SOFT_RESET) | |
1787 | | (1 << M8051_RESET); | |
1788 | writel (tmp, &dev->regs->devinit); | |
1789 | ||
1790 | /* standard fifo and endpoint allocations */ | |
1791 | set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0); | |
1792 | } | |
1793 | ||
1794 | static void usb_reinit (struct net2280 *dev) | |
1795 | { | |
1796 | u32 tmp; | |
1797 | int init_dma; | |
1798 | ||
1799 | /* use_dma changes are ignored till next device re-init */ | |
1800 | init_dma = use_dma; | |
1801 | ||
1802 | /* basic endpoint init */ | |
1803 | for (tmp = 0; tmp < 7; tmp++) { | |
1804 | struct net2280_ep *ep = &dev->ep [tmp]; | |
1805 | ||
1806 | ep->ep.name = ep_name [tmp]; | |
1807 | ep->dev = dev; | |
1808 | ep->num = tmp; | |
1809 | ||
1810 | if (tmp > 0 && tmp <= 4) { | |
1811 | ep->fifo_size = 1024; | |
1812 | if (init_dma) | |
1813 | ep->dma = &dev->dma [tmp - 1]; | |
1814 | } else | |
1815 | ep->fifo_size = 64; | |
1816 | ep->regs = &dev->epregs [tmp]; | |
1817 | ep_reset (dev->regs, ep); | |
1818 | } | |
1819 | dev->ep [0].ep.maxpacket = 64; | |
1820 | dev->ep [5].ep.maxpacket = 64; | |
1821 | dev->ep [6].ep.maxpacket = 64; | |
1822 | ||
1823 | dev->gadget.ep0 = &dev->ep [0].ep; | |
1824 | dev->ep [0].stopped = 0; | |
1825 | INIT_LIST_HEAD (&dev->gadget.ep0->ep_list); | |
1826 | ||
1827 | /* we want to prevent lowlevel/insecure access from the USB host, | |
1828 | * but erratum 0119 means this enable bit is ignored | |
1829 | */ | |
1830 | for (tmp = 0; tmp < 5; tmp++) | |
1831 | writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg); | |
1832 | } | |
1833 | ||
1834 | static void ep0_start (struct net2280 *dev) | |
1835 | { | |
1836 | writel ( (1 << CLEAR_EP_HIDE_STATUS_PHASE) | |
1837 | | (1 << CLEAR_NAK_OUT_PACKETS) | |
1838 | | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) | |
1839 | , &dev->epregs [0].ep_rsp); | |
1840 | ||
1841 | /* | |
1842 | * hardware optionally handles a bunch of standard requests | |
1843 | * that the API hides from drivers anyway. have it do so. | |
1844 | * endpoint status/features are handled in software, to | |
1845 | * help pass tests for some dubious behavior. | |
1846 | */ | |
1847 | writel ( (1 << SET_TEST_MODE) | |
1848 | | (1 << SET_ADDRESS) | |
1849 | | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) | |
1850 | | (1 << GET_DEVICE_STATUS) | |
1851 | | (1 << GET_INTERFACE_STATUS) | |
1852 | , &dev->usb->stdrsp); | |
1853 | writel ( (1 << USB_ROOT_PORT_WAKEUP_ENABLE) | |
1854 | | (1 << SELF_POWERED_USB_DEVICE) | |
1855 | | (1 << REMOTE_WAKEUP_SUPPORT) | |
1856 | | (dev->softconnect << USB_DETECT_ENABLE) | |
1857 | | (1 << SELF_POWERED_STATUS) | |
1858 | , &dev->usb->usbctl); | |
1859 | ||
1860 | /* enable irqs so we can see ep0 and general operation */ | |
1861 | writel ( (1 << SETUP_PACKET_INTERRUPT_ENABLE) | |
1862 | | (1 << ENDPOINT_0_INTERRUPT_ENABLE) | |
1863 | , &dev->regs->pciirqenb0); | |
1864 | writel ( (1 << PCI_INTERRUPT_ENABLE) | |
1865 | | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) | |
1866 | | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) | |
1867 | | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE) | |
1868 | | (1 << VBUS_INTERRUPT_ENABLE) | |
1869 | | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE) | |
1870 | | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) | |
1871 | , &dev->regs->pciirqenb1); | |
1872 | ||
1873 | /* don't leave any writes posted */ | |
1874 | (void) readl (&dev->usb->usbctl); | |
1875 | } | |
1876 | ||
1877 | /* when a driver is successfully registered, it will receive | |
1878 | * control requests including set_configuration(), which enables | |
1879 | * non-control requests. then usb traffic follows until a | |
1880 | * disconnect is reported. then a host may connect again, or | |
1881 | * the driver might get unbound. | |
1882 | */ | |
0f91349b | 1883 | static int net2280_start(struct usb_gadget_driver *driver, |
b0fca50f | 1884 | int (*bind)(struct usb_gadget *)) |
1da177e4 LT |
1885 | { |
1886 | struct net2280 *dev = the_controller; | |
1887 | int retval; | |
1888 | unsigned i; | |
1889 | ||
1890 | /* insist on high speed support from the driver, since | |
1891 | * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE) | |
1892 | * "must not be used in normal operation" | |
1893 | */ | |
1894 | if (!driver | |
1895 | || driver->speed != USB_SPEED_HIGH | |
b0fca50f | 1896 | || !bind || !driver->setup) |
1da177e4 LT |
1897 | return -EINVAL; |
1898 | if (!dev) | |
1899 | return -ENODEV; | |
1900 | if (dev->driver) | |
1901 | return -EBUSY; | |
1902 | ||
1903 | for (i = 0; i < 7; i++) | |
1904 | dev->ep [i].irqs = 0; | |
1905 | ||
1906 | /* hook up the driver ... */ | |
1907 | dev->softconnect = 1; | |
1908 | driver->driver.bus = NULL; | |
1909 | dev->driver = driver; | |
1910 | dev->gadget.dev.driver = &driver->driver; | |
b0fca50f | 1911 | retval = bind(&dev->gadget); |
1da177e4 LT |
1912 | if (retval) { |
1913 | DEBUG (dev, "bind to driver %s --> %d\n", | |
1914 | driver->driver.name, retval); | |
1915 | dev->driver = NULL; | |
1916 | dev->gadget.dev.driver = NULL; | |
1917 | return retval; | |
1918 | } | |
1919 | ||
b3899dac JG |
1920 | retval = device_create_file (&dev->pdev->dev, &dev_attr_function); |
1921 | if (retval) goto err_unbind; | |
1922 | retval = device_create_file (&dev->pdev->dev, &dev_attr_queues); | |
1923 | if (retval) goto err_func; | |
1da177e4 LT |
1924 | |
1925 | /* ... then enable host detection and ep0; and we're ready | |
1926 | * for set_configuration as well as eventual disconnect. | |
1927 | */ | |
1928 | net2280_led_active (dev, 1); | |
1929 | ep0_start (dev); | |
1930 | ||
1931 | DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n", | |
1932 | driver->driver.name, | |
1933 | readl (&dev->usb->usbctl), | |
1934 | readl (&dev->usb->stdrsp)); | |
1935 | ||
1936 | /* pci writes may still be posted */ | |
1937 | return 0; | |
b3899dac JG |
1938 | |
1939 | err_func: | |
1940 | device_remove_file (&dev->pdev->dev, &dev_attr_function); | |
1941 | err_unbind: | |
1942 | driver->unbind (&dev->gadget); | |
1943 | dev->gadget.dev.driver = NULL; | |
1944 | dev->driver = NULL; | |
1945 | return retval; | |
1da177e4 | 1946 | } |
1da177e4 LT |
1947 | |
1948 | static void | |
1949 | stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver) | |
1950 | { | |
1951 | int i; | |
1952 | ||
1953 | /* don't disconnect if it's not connected */ | |
1954 | if (dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1955 | driver = NULL; | |
1956 | ||
1957 | /* stop hardware; prevent new request submissions; | |
1958 | * and kill any outstanding requests. | |
1959 | */ | |
1960 | usb_reset (dev); | |
1961 | for (i = 0; i < 7; i++) | |
1962 | nuke (&dev->ep [i]); | |
1963 | ||
1964 | /* report disconnect; the driver is already quiesced */ | |
1965 | if (driver) { | |
1966 | spin_unlock (&dev->lock); | |
1967 | driver->disconnect (&dev->gadget); | |
1968 | spin_lock (&dev->lock); | |
1969 | } | |
1970 | ||
1971 | usb_reinit (dev); | |
1972 | } | |
1973 | ||
0f91349b | 1974 | static int net2280_stop(struct usb_gadget_driver *driver) |
1da177e4 LT |
1975 | { |
1976 | struct net2280 *dev = the_controller; | |
1977 | unsigned long flags; | |
1978 | ||
1979 | if (!dev) | |
1980 | return -ENODEV; | |
6bea476c | 1981 | if (!driver || driver != dev->driver || !driver->unbind) |
1da177e4 LT |
1982 | return -EINVAL; |
1983 | ||
1984 | spin_lock_irqsave (&dev->lock, flags); | |
1985 | stop_activity (dev, driver); | |
1986 | spin_unlock_irqrestore (&dev->lock, flags); | |
1987 | ||
1988 | net2280_pullup (&dev->gadget, 0); | |
1989 | ||
1990 | driver->unbind (&dev->gadget); | |
1991 | dev->gadget.dev.driver = NULL; | |
1992 | dev->driver = NULL; | |
1993 | ||
1994 | net2280_led_active (dev, 0); | |
1995 | device_remove_file (&dev->pdev->dev, &dev_attr_function); | |
1996 | device_remove_file (&dev->pdev->dev, &dev_attr_queues); | |
1997 | ||
1998 | DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name); | |
1999 | return 0; | |
2000 | } | |
1da177e4 LT |
2001 | |
2002 | /*-------------------------------------------------------------------------*/ | |
2003 | ||
2004 | /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq. | |
2005 | * also works for dma-capable endpoints, in pio mode or just | |
2006 | * to manually advance the queue after short OUT transfers. | |
2007 | */ | |
2008 | static void handle_ep_small (struct net2280_ep *ep) | |
2009 | { | |
2010 | struct net2280_request *req; | |
2011 | u32 t; | |
2012 | /* 0 error, 1 mid-data, 2 done */ | |
2013 | int mode = 1; | |
2014 | ||
2015 | if (!list_empty (&ep->queue)) | |
2016 | req = list_entry (ep->queue.next, | |
2017 | struct net2280_request, queue); | |
2018 | else | |
2019 | req = NULL; | |
2020 | ||
2021 | /* ack all, and handle what we care about */ | |
2022 | t = readl (&ep->regs->ep_stat); | |
2023 | ep->irqs++; | |
2024 | #if 0 | |
2025 | VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n", | |
2026 | ep->ep.name, t, req ? &req->req : 0); | |
2027 | #endif | |
950ee4c8 GL |
2028 | if (!ep->is_in || ep->dev->pdev->device == 0x2280) |
2029 | writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat); | |
2030 | else | |
2031 | /* Added for 2282 */ | |
2032 | writel (t, &ep->regs->ep_stat); | |
1da177e4 LT |
2033 | |
2034 | /* for ep0, monitor token irqs to catch data stage length errors | |
2035 | * and to synchronize on status. | |
2036 | * | |
2037 | * also, to defer reporting of protocol stalls ... here's where | |
2038 | * data or status first appears, handling stalls here should never | |
2039 | * cause trouble on the host side.. | |
2040 | * | |
2041 | * control requests could be slightly faster without token synch for | |
2042 | * status, but status can jam up that way. | |
2043 | */ | |
2044 | if (unlikely (ep->num == 0)) { | |
2045 | if (ep->is_in) { | |
2046 | /* status; stop NAKing */ | |
2047 | if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) { | |
2048 | if (ep->dev->protocol_stall) { | |
2049 | ep->stopped = 1; | |
2050 | set_halt (ep); | |
2051 | } | |
2052 | if (!req) | |
2053 | allow_status (ep); | |
2054 | mode = 2; | |
2055 | /* reply to extra IN data tokens with a zlp */ | |
2056 | } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) { | |
2057 | if (ep->dev->protocol_stall) { | |
2058 | ep->stopped = 1; | |
2059 | set_halt (ep); | |
2060 | mode = 2; | |
1f26e28d AS |
2061 | } else if (ep->responded && |
2062 | !req && !ep->stopped) | |
1da177e4 LT |
2063 | write_fifo (ep, NULL); |
2064 | } | |
2065 | } else { | |
2066 | /* status; stop NAKing */ | |
2067 | if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) { | |
2068 | if (ep->dev->protocol_stall) { | |
2069 | ep->stopped = 1; | |
2070 | set_halt (ep); | |
2071 | } | |
2072 | mode = 2; | |
2073 | /* an extra OUT token is an error */ | |
2074 | } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) | |
2075 | && req | |
2076 | && req->req.actual == req->req.length) | |
1f26e28d | 2077 | || (ep->responded && !req)) { |
1da177e4 LT |
2078 | ep->dev->protocol_stall = 1; |
2079 | set_halt (ep); | |
2080 | ep->stopped = 1; | |
2081 | if (req) | |
2082 | done (ep, req, -EOVERFLOW); | |
2083 | req = NULL; | |
2084 | } | |
2085 | } | |
2086 | } | |
2087 | ||
2088 | if (unlikely (!req)) | |
2089 | return; | |
2090 | ||
2091 | /* manual DMA queue advance after short OUT */ | |
2092 | if (likely (ep->dma != 0)) { | |
2093 | if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) { | |
2094 | u32 count; | |
2095 | int stopped = ep->stopped; | |
2096 | ||
2097 | /* TRANSFERRED works around OUT_DONE erratum 0112. | |
2098 | * we expect (N <= maxpacket) bytes; host wrote M. | |
2099 | * iff (M < N) we won't ever see a DMA interrupt. | |
2100 | */ | |
2101 | ep->stopped = 1; | |
2102 | for (count = 0; ; t = readl (&ep->regs->ep_stat)) { | |
2103 | ||
2104 | /* any preceding dma transfers must finish. | |
2105 | * dma handles (M >= N), may empty the queue | |
2106 | */ | |
2107 | scan_dma_completions (ep); | |
2108 | if (unlikely (list_empty (&ep->queue) | |
2109 | || ep->out_overflow)) { | |
2110 | req = NULL; | |
2111 | break; | |
2112 | } | |
2113 | req = list_entry (ep->queue.next, | |
2114 | struct net2280_request, queue); | |
2115 | ||
2116 | /* here either (M < N), a "real" short rx; | |
2117 | * or (M == N) and the queue didn't empty | |
2118 | */ | |
2119 | if (likely (t & (1 << FIFO_EMPTY))) { | |
2120 | count = readl (&ep->dma->dmacount); | |
2121 | count &= DMA_BYTE_COUNT_MASK; | |
2122 | if (readl (&ep->dma->dmadesc) | |
2123 | != req->td_dma) | |
2124 | req = NULL; | |
2125 | break; | |
2126 | } | |
2127 | udelay(1); | |
2128 | } | |
2129 | ||
2130 | /* stop DMA, leave ep NAKing */ | |
2131 | writel ((1 << DMA_ABORT), &ep->dma->dmastat); | |
2132 | spin_stop_dma (ep->dma); | |
2133 | ||
2134 | if (likely (req)) { | |
2135 | req->td->dmacount = 0; | |
2136 | t = readl (&ep->regs->ep_avail); | |
68dcc688 | 2137 | dma_done (ep, req, count, |
901b3d75 DB |
2138 | (ep->out_overflow || t) |
2139 | ? -EOVERFLOW : 0); | |
1da177e4 LT |
2140 | } |
2141 | ||
2142 | /* also flush to prevent erratum 0106 trouble */ | |
2143 | if (unlikely (ep->out_overflow | |
2144 | || (ep->dev->chiprev == 0x0100 | |
2145 | && ep->dev->gadget.speed | |
2146 | == USB_SPEED_FULL))) { | |
2147 | out_flush (ep); | |
2148 | ep->out_overflow = 0; | |
2149 | } | |
2150 | ||
2151 | /* (re)start dma if needed, stop NAKing */ | |
2152 | ep->stopped = stopped; | |
2153 | if (!list_empty (&ep->queue)) | |
2154 | restart_dma (ep); | |
2155 | } else | |
2156 | DEBUG (ep->dev, "%s dma ep_stat %08x ??\n", | |
2157 | ep->ep.name, t); | |
2158 | return; | |
2159 | ||
2160 | /* data packet(s) received (in the fifo, OUT) */ | |
2161 | } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) { | |
2162 | if (read_fifo (ep, req) && ep->num != 0) | |
2163 | mode = 2; | |
2164 | ||
2165 | /* data packet(s) transmitted (IN) */ | |
2166 | } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) { | |
2167 | unsigned len; | |
2168 | ||
2169 | len = req->req.length - req->req.actual; | |
2170 | if (len > ep->ep.maxpacket) | |
2171 | len = ep->ep.maxpacket; | |
2172 | req->req.actual += len; | |
2173 | ||
2174 | /* if we wrote it all, we're usually done */ | |
2175 | if (req->req.actual == req->req.length) { | |
2176 | if (ep->num == 0) { | |
317e83b8 | 2177 | /* send zlps until the status stage */ |
1da177e4 LT |
2178 | } else if (!req->req.zero || len != ep->ep.maxpacket) |
2179 | mode = 2; | |
2180 | } | |
2181 | ||
2182 | /* there was nothing to do ... */ | |
2183 | } else if (mode == 1) | |
2184 | return; | |
2185 | ||
2186 | /* done */ | |
2187 | if (mode == 2) { | |
2188 | /* stream endpoints often resubmit/unlink in completion */ | |
2189 | done (ep, req, 0); | |
2190 | ||
2191 | /* maybe advance queue to next request */ | |
2192 | if (ep->num == 0) { | |
2193 | /* NOTE: net2280 could let gadget driver start the | |
2194 | * status stage later. since not all controllers let | |
2195 | * them control that, the api doesn't (yet) allow it. | |
2196 | */ | |
2197 | if (!ep->stopped) | |
2198 | allow_status (ep); | |
2199 | req = NULL; | |
2200 | } else { | |
2201 | if (!list_empty (&ep->queue) && !ep->stopped) | |
2202 | req = list_entry (ep->queue.next, | |
2203 | struct net2280_request, queue); | |
2204 | else | |
2205 | req = NULL; | |
2206 | if (req && !ep->is_in) | |
2207 | stop_out_naking (ep); | |
2208 | } | |
2209 | } | |
2210 | ||
2211 | /* is there a buffer for the next packet? | |
2212 | * for best streaming performance, make sure there is one. | |
2213 | */ | |
2214 | if (req && !ep->stopped) { | |
2215 | ||
2216 | /* load IN fifo with next packet (may be zlp) */ | |
2217 | if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) | |
2218 | write_fifo (ep, &req->req); | |
2219 | } | |
2220 | } | |
2221 | ||
2222 | static struct net2280_ep * | |
2223 | get_ep_by_addr (struct net2280 *dev, u16 wIndex) | |
2224 | { | |
2225 | struct net2280_ep *ep; | |
2226 | ||
2227 | if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0) | |
2228 | return &dev->ep [0]; | |
2229 | list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) { | |
2230 | u8 bEndpointAddress; | |
2231 | ||
2232 | if (!ep->desc) | |
2233 | continue; | |
2234 | bEndpointAddress = ep->desc->bEndpointAddress; | |
2235 | if ((wIndex ^ bEndpointAddress) & USB_DIR_IN) | |
2236 | continue; | |
2237 | if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f)) | |
2238 | return ep; | |
2239 | } | |
2240 | return NULL; | |
2241 | } | |
2242 | ||
2243 | static void handle_stat0_irqs (struct net2280 *dev, u32 stat) | |
2244 | { | |
2245 | struct net2280_ep *ep; | |
2246 | u32 num, scratch; | |
2247 | ||
2248 | /* most of these don't need individual acks */ | |
2249 | stat &= ~(1 << INTA_ASSERTED); | |
2250 | if (!stat) | |
2251 | return; | |
2252 | // DEBUG (dev, "irqstat0 %04x\n", stat); | |
2253 | ||
2254 | /* starting a control request? */ | |
2255 | if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) { | |
2256 | union { | |
2257 | u32 raw [2]; | |
2258 | struct usb_ctrlrequest r; | |
2259 | } u; | |
950ee4c8 | 2260 | int tmp; |
1da177e4 LT |
2261 | struct net2280_request *req; |
2262 | ||
2263 | if (dev->gadget.speed == USB_SPEED_UNKNOWN) { | |
2264 | if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED)) | |
2265 | dev->gadget.speed = USB_SPEED_HIGH; | |
2266 | else | |
2267 | dev->gadget.speed = USB_SPEED_FULL; | |
2268 | net2280_led_speed (dev, dev->gadget.speed); | |
2269 | DEBUG (dev, "%s speed\n", | |
2270 | (dev->gadget.speed == USB_SPEED_HIGH) | |
2271 | ? "high" : "full"); | |
2272 | } | |
2273 | ||
2274 | ep = &dev->ep [0]; | |
2275 | ep->irqs++; | |
2276 | ||
2277 | /* make sure any leftover request state is cleared */ | |
2278 | stat &= ~(1 << ENDPOINT_0_INTERRUPT); | |
2279 | while (!list_empty (&ep->queue)) { | |
2280 | req = list_entry (ep->queue.next, | |
2281 | struct net2280_request, queue); | |
2282 | done (ep, req, (req->req.actual == req->req.length) | |
2283 | ? 0 : -EPROTO); | |
2284 | } | |
2285 | ep->stopped = 0; | |
2286 | dev->protocol_stall = 0; | |
950ee4c8 GL |
2287 | |
2288 | if (ep->dev->pdev->device == 0x2280) | |
2289 | tmp = (1 << FIFO_OVERFLOW) | |
2290 | | (1 << FIFO_UNDERFLOW); | |
2291 | else | |
2292 | tmp = 0; | |
2293 | ||
2294 | writel (tmp | (1 << TIMEOUT) | |
1da177e4 LT |
2295 | | (1 << USB_STALL_SENT) |
2296 | | (1 << USB_IN_NAK_SENT) | |
2297 | | (1 << USB_IN_ACK_RCVD) | |
2298 | | (1 << USB_OUT_PING_NAK_SENT) | |
2299 | | (1 << USB_OUT_ACK_SENT) | |
1da177e4 LT |
2300 | | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT) |
2301 | | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) | |
2302 | | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
2303 | | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | |
2304 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
2305 | | (1 << DATA_IN_TOKEN_INTERRUPT) | |
2306 | , &ep->regs->ep_stat); | |
2307 | u.raw [0] = readl (&dev->usb->setup0123); | |
2308 | u.raw [1] = readl (&dev->usb->setup4567); | |
901b3d75 | 2309 | |
1da177e4 LT |
2310 | cpu_to_le32s (&u.raw [0]); |
2311 | cpu_to_le32s (&u.raw [1]); | |
2312 | ||
950ee4c8 GL |
2313 | tmp = 0; |
2314 | ||
01ee7d70 DB |
2315 | #define w_value le16_to_cpu(u.r.wValue) |
2316 | #define w_index le16_to_cpu(u.r.wIndex) | |
2317 | #define w_length le16_to_cpu(u.r.wLength) | |
1da177e4 LT |
2318 | |
2319 | /* ack the irq */ | |
2320 | writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0); | |
2321 | stat ^= (1 << SETUP_PACKET_INTERRUPT); | |
2322 | ||
2323 | /* watch control traffic at the token level, and force | |
2324 | * synchronization before letting the status stage happen. | |
2325 | * FIXME ignore tokens we'll NAK, until driver responds. | |
2326 | * that'll mean a lot less irqs for some drivers. | |
2327 | */ | |
2328 | ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0; | |
2329 | if (ep->is_in) { | |
2330 | scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | |
2331 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
2332 | | (1 << DATA_IN_TOKEN_INTERRUPT); | |
2333 | stop_out_naking (ep); | |
2334 | } else | |
2335 | scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
2336 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
2337 | | (1 << DATA_IN_TOKEN_INTERRUPT); | |
2338 | writel (scratch, &dev->epregs [0].ep_irqenb); | |
2339 | ||
2340 | /* we made the hardware handle most lowlevel requests; | |
2341 | * everything else goes uplevel to the gadget code. | |
2342 | */ | |
1f26e28d | 2343 | ep->responded = 1; |
1da177e4 LT |
2344 | switch (u.r.bRequest) { |
2345 | case USB_REQ_GET_STATUS: { | |
2346 | struct net2280_ep *e; | |
320f3459 | 2347 | __le32 status; |
1da177e4 LT |
2348 | |
2349 | /* hw handles device and interface status */ | |
2350 | if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT)) | |
2351 | goto delegate; | |
320f3459 DB |
2352 | if ((e = get_ep_by_addr (dev, w_index)) == 0 |
2353 | || w_length > 2) | |
1da177e4 LT |
2354 | goto do_stall; |
2355 | ||
2356 | if (readl (&e->regs->ep_rsp) | |
2357 | & (1 << SET_ENDPOINT_HALT)) | |
551509d2 | 2358 | status = cpu_to_le32 (1); |
1da177e4 | 2359 | else |
551509d2 | 2360 | status = cpu_to_le32 (0); |
1da177e4 LT |
2361 | |
2362 | /* don't bother with a request object! */ | |
2363 | writel (0, &dev->epregs [0].ep_irqenb); | |
320f3459 DB |
2364 | set_fifo_bytecount (ep, w_length); |
2365 | writel ((__force u32)status, &dev->epregs [0].ep_data); | |
1da177e4 LT |
2366 | allow_status (ep); |
2367 | VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status); | |
2368 | goto next_endpoints; | |
2369 | } | |
2370 | break; | |
2371 | case USB_REQ_CLEAR_FEATURE: { | |
2372 | struct net2280_ep *e; | |
2373 | ||
2374 | /* hw handles device features */ | |
2375 | if (u.r.bRequestType != USB_RECIP_ENDPOINT) | |
2376 | goto delegate; | |
320f3459 DB |
2377 | if (w_value != USB_ENDPOINT_HALT |
2378 | || w_length != 0) | |
1da177e4 | 2379 | goto do_stall; |
320f3459 | 2380 | if ((e = get_ep_by_addr (dev, w_index)) == 0) |
1da177e4 | 2381 | goto do_stall; |
8066134f AS |
2382 | if (e->wedged) { |
2383 | VDEBUG(dev, "%s wedged, halt not cleared\n", | |
2384 | ep->ep.name); | |
2385 | } else { | |
2386 | VDEBUG(dev, "%s clear halt\n", ep->ep.name); | |
2387 | clear_halt(e); | |
2388 | } | |
1da177e4 | 2389 | allow_status (ep); |
1da177e4 LT |
2390 | goto next_endpoints; |
2391 | } | |
2392 | break; | |
2393 | case USB_REQ_SET_FEATURE: { | |
2394 | struct net2280_ep *e; | |
2395 | ||
2396 | /* hw handles device features */ | |
2397 | if (u.r.bRequestType != USB_RECIP_ENDPOINT) | |
2398 | goto delegate; | |
320f3459 DB |
2399 | if (w_value != USB_ENDPOINT_HALT |
2400 | || w_length != 0) | |
1da177e4 | 2401 | goto do_stall; |
320f3459 | 2402 | if ((e = get_ep_by_addr (dev, w_index)) == 0) |
1da177e4 | 2403 | goto do_stall; |
8066134f AS |
2404 | if (e->ep.name == ep0name) |
2405 | goto do_stall; | |
1da177e4 LT |
2406 | set_halt (e); |
2407 | allow_status (ep); | |
2408 | VDEBUG (dev, "%s set halt\n", ep->ep.name); | |
2409 | goto next_endpoints; | |
2410 | } | |
2411 | break; | |
2412 | default: | |
2413 | delegate: | |
fec8de3a | 2414 | VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x " |
1da177e4 LT |
2415 | "ep_cfg %08x\n", |
2416 | u.r.bRequestType, u.r.bRequest, | |
320f3459 | 2417 | w_value, w_index, w_length, |
1da177e4 | 2418 | readl (&ep->regs->ep_cfg)); |
1f26e28d | 2419 | ep->responded = 0; |
1da177e4 LT |
2420 | spin_unlock (&dev->lock); |
2421 | tmp = dev->driver->setup (&dev->gadget, &u.r); | |
2422 | spin_lock (&dev->lock); | |
2423 | } | |
2424 | ||
2425 | /* stall ep0 on error */ | |
2426 | if (tmp < 0) { | |
2427 | do_stall: | |
2428 | VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n", | |
2429 | u.r.bRequestType, u.r.bRequest, tmp); | |
2430 | dev->protocol_stall = 1; | |
2431 | } | |
2432 | ||
2433 | /* some in/out token irq should follow; maybe stall then. | |
2434 | * driver must queue a request (even zlp) or halt ep0 | |
2435 | * before the host times out. | |
2436 | */ | |
2437 | } | |
2438 | ||
320f3459 DB |
2439 | #undef w_value |
2440 | #undef w_index | |
2441 | #undef w_length | |
2442 | ||
1da177e4 LT |
2443 | next_endpoints: |
2444 | /* endpoint data irq ? */ | |
2445 | scratch = stat & 0x7f; | |
2446 | stat &= ~0x7f; | |
2447 | for (num = 0; scratch; num++) { | |
2448 | u32 t; | |
2449 | ||
2450 | /* do this endpoint's FIFO and queue need tending? */ | |
2451 | t = 1 << num; | |
2452 | if ((scratch & t) == 0) | |
2453 | continue; | |
2454 | scratch ^= t; | |
2455 | ||
2456 | ep = &dev->ep [num]; | |
2457 | handle_ep_small (ep); | |
2458 | } | |
2459 | ||
2460 | if (stat) | |
2461 | DEBUG (dev, "unhandled irqstat0 %08x\n", stat); | |
2462 | } | |
2463 | ||
2464 | #define DMA_INTERRUPTS ( \ | |
2465 | (1 << DMA_D_INTERRUPT) \ | |
2466 | | (1 << DMA_C_INTERRUPT) \ | |
2467 | | (1 << DMA_B_INTERRUPT) \ | |
2468 | | (1 << DMA_A_INTERRUPT)) | |
2469 | #define PCI_ERROR_INTERRUPTS ( \ | |
2470 | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \ | |
2471 | | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \ | |
2472 | | (1 << PCI_RETRY_ABORT_INTERRUPT)) | |
2473 | ||
2474 | static void handle_stat1_irqs (struct net2280 *dev, u32 stat) | |
2475 | { | |
2476 | struct net2280_ep *ep; | |
2477 | u32 tmp, num, mask, scratch; | |
2478 | ||
2479 | /* after disconnect there's nothing else to do! */ | |
2480 | tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT); | |
2481 | mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED); | |
2482 | ||
2483 | /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set. | |
2484 | * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRRUPT set and | |
901b3d75 | 2485 | * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT |
1da177e4 LT |
2486 | * only indicates a change in the reset state). |
2487 | */ | |
2488 | if (stat & tmp) { | |
2489 | writel (tmp, &dev->regs->irqstat1); | |
901b3d75 DB |
2490 | if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT)) |
2491 | && ((readl (&dev->usb->usbstat) & mask) | |
2492 | == 0)) | |
2493 | || ((readl (&dev->usb->usbctl) | |
2494 | & (1 << VBUS_PIN)) == 0) | |
1da177e4 LT |
2495 | ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) { |
2496 | DEBUG (dev, "disconnect %s\n", | |
2497 | dev->driver->driver.name); | |
2498 | stop_activity (dev, dev->driver); | |
2499 | ep0_start (dev); | |
2500 | return; | |
2501 | } | |
2502 | stat &= ~tmp; | |
2503 | ||
2504 | /* vBUS can bounce ... one of many reasons to ignore the | |
2505 | * notion of hotplug events on bus connect/disconnect! | |
2506 | */ | |
2507 | if (!stat) | |
2508 | return; | |
2509 | } | |
2510 | ||
2511 | /* NOTE: chip stays in PCI D0 state for now, but it could | |
2512 | * enter D1 to save more power | |
2513 | */ | |
2514 | tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT); | |
2515 | if (stat & tmp) { | |
2516 | writel (tmp, &dev->regs->irqstat1); | |
2517 | if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) { | |
2518 | if (dev->driver->suspend) | |
2519 | dev->driver->suspend (&dev->gadget); | |
2520 | if (!enable_suspend) | |
2521 | stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT); | |
2522 | } else { | |
2523 | if (dev->driver->resume) | |
2524 | dev->driver->resume (&dev->gadget); | |
2525 | /* at high speed, note erratum 0133 */ | |
2526 | } | |
2527 | stat &= ~tmp; | |
2528 | } | |
2529 | ||
2530 | /* clear any other status/irqs */ | |
2531 | if (stat) | |
2532 | writel (stat, &dev->regs->irqstat1); | |
2533 | ||
2534 | /* some status we can just ignore */ | |
950ee4c8 GL |
2535 | if (dev->pdev->device == 0x2280) |
2536 | stat &= ~((1 << CONTROL_STATUS_INTERRUPT) | |
2537 | | (1 << SUSPEND_REQUEST_INTERRUPT) | |
2538 | | (1 << RESUME_INTERRUPT) | |
2539 | | (1 << SOF_INTERRUPT)); | |
2540 | else | |
2541 | stat &= ~((1 << CONTROL_STATUS_INTERRUPT) | |
2542 | | (1 << RESUME_INTERRUPT) | |
2543 | | (1 << SOF_DOWN_INTERRUPT) | |
2544 | | (1 << SOF_INTERRUPT)); | |
2545 | ||
1da177e4 LT |
2546 | if (!stat) |
2547 | return; | |
2548 | // DEBUG (dev, "irqstat1 %08x\n", stat); | |
2549 | ||
2550 | /* DMA status, for ep-{a,b,c,d} */ | |
2551 | scratch = stat & DMA_INTERRUPTS; | |
2552 | stat &= ~DMA_INTERRUPTS; | |
2553 | scratch >>= 9; | |
2554 | for (num = 0; scratch; num++) { | |
2555 | struct net2280_dma_regs __iomem *dma; | |
2556 | ||
2557 | tmp = 1 << num; | |
2558 | if ((tmp & scratch) == 0) | |
2559 | continue; | |
2560 | scratch ^= tmp; | |
2561 | ||
2562 | ep = &dev->ep [num + 1]; | |
2563 | dma = ep->dma; | |
2564 | ||
2565 | if (!dma) | |
2566 | continue; | |
2567 | ||
2568 | /* clear ep's dma status */ | |
2569 | tmp = readl (&dma->dmastat); | |
2570 | writel (tmp, &dma->dmastat); | |
2571 | ||
2572 | /* chaining should stop on abort, short OUT from fifo, | |
2573 | * or (stat0 codepath) short OUT transfer. | |
2574 | */ | |
2575 | if (!use_dma_chaining) { | |
2576 | if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT)) | |
2577 | == 0) { | |
2578 | DEBUG (ep->dev, "%s no xact done? %08x\n", | |
2579 | ep->ep.name, tmp); | |
2580 | continue; | |
2581 | } | |
2582 | stop_dma (ep->dma); | |
2583 | } | |
2584 | ||
2585 | /* OUT transfers terminate when the data from the | |
2586 | * host is in our memory. Process whatever's done. | |
2587 | * On this path, we know transfer's last packet wasn't | |
2588 | * less than req->length. NAK_OUT_PACKETS may be set, | |
2589 | * or the FIFO may already be holding new packets. | |
2590 | * | |
2591 | * IN transfers can linger in the FIFO for a very | |
2592 | * long time ... we ignore that for now, accounting | |
2593 | * precisely (like PIO does) needs per-packet irqs | |
2594 | */ | |
2595 | scan_dma_completions (ep); | |
2596 | ||
2597 | /* disable dma on inactive queues; else maybe restart */ | |
2598 | if (list_empty (&ep->queue)) { | |
2599 | if (use_dma_chaining) | |
2600 | stop_dma (ep->dma); | |
2601 | } else { | |
2602 | tmp = readl (&dma->dmactl); | |
2603 | if (!use_dma_chaining | |
2604 | || (tmp & (1 << DMA_ENABLE)) == 0) | |
2605 | restart_dma (ep); | |
2606 | else if (ep->is_in && use_dma_chaining) { | |
2607 | struct net2280_request *req; | |
320f3459 | 2608 | __le32 dmacount; |
1da177e4 LT |
2609 | |
2610 | /* the descriptor at the head of the chain | |
2611 | * may still have VALID_BIT clear; that's | |
2612 | * used to trigger changing DMA_FIFO_VALIDATE | |
2613 | * (affects automagic zlp writes). | |
2614 | */ | |
2615 | req = list_entry (ep->queue.next, | |
2616 | struct net2280_request, queue); | |
2617 | dmacount = req->td->dmacount; | |
551509d2 | 2618 | dmacount &= cpu_to_le32 ( |
1da177e4 LT |
2619 | (1 << VALID_BIT) |
2620 | | DMA_BYTE_COUNT_MASK); | |
2621 | if (dmacount && (dmacount & valid_bit) == 0) | |
2622 | restart_dma (ep); | |
2623 | } | |
2624 | } | |
2625 | ep->irqs++; | |
2626 | } | |
2627 | ||
2628 | /* NOTE: there are other PCI errors we might usefully notice. | |
2629 | * if they appear very often, here's where to try recovering. | |
2630 | */ | |
2631 | if (stat & PCI_ERROR_INTERRUPTS) { | |
2632 | ERROR (dev, "pci dma error; stat %08x\n", stat); | |
2633 | stat &= ~PCI_ERROR_INTERRUPTS; | |
2634 | /* these are fatal errors, but "maybe" they won't | |
2635 | * happen again ... | |
2636 | */ | |
2637 | stop_activity (dev, dev->driver); | |
2638 | ep0_start (dev); | |
2639 | stat = 0; | |
2640 | } | |
2641 | ||
2642 | if (stat) | |
2643 | DEBUG (dev, "unhandled irqstat1 %08x\n", stat); | |
2644 | } | |
2645 | ||
7d12e780 | 2646 | static irqreturn_t net2280_irq (int irq, void *_dev) |
1da177e4 LT |
2647 | { |
2648 | struct net2280 *dev = _dev; | |
2649 | ||
658ad5e0 AS |
2650 | /* shared interrupt, not ours */ |
2651 | if (!(readl(&dev->regs->irqstat0) & (1 << INTA_ASSERTED))) | |
2652 | return IRQ_NONE; | |
2653 | ||
1da177e4 LT |
2654 | spin_lock (&dev->lock); |
2655 | ||
2656 | /* handle disconnect, dma, and more */ | |
2657 | handle_stat1_irqs (dev, readl (&dev->regs->irqstat1)); | |
2658 | ||
2659 | /* control requests and PIO */ | |
2660 | handle_stat0_irqs (dev, readl (&dev->regs->irqstat0)); | |
2661 | ||
2662 | spin_unlock (&dev->lock); | |
2663 | ||
2664 | return IRQ_HANDLED; | |
2665 | } | |
2666 | ||
2667 | /*-------------------------------------------------------------------------*/ | |
2668 | ||
2669 | static void gadget_release (struct device *_dev) | |
2670 | { | |
2671 | struct net2280 *dev = dev_get_drvdata (_dev); | |
2672 | ||
2673 | kfree (dev); | |
2674 | } | |
2675 | ||
2676 | /* tear down the binding between this driver and the pci device */ | |
2677 | ||
2678 | static void net2280_remove (struct pci_dev *pdev) | |
2679 | { | |
2680 | struct net2280 *dev = pci_get_drvdata (pdev); | |
2681 | ||
0f91349b SAS |
2682 | usb_del_gadget_udc(&dev->gadget); |
2683 | ||
6bea476c | 2684 | BUG_ON(dev->driver); |
1da177e4 LT |
2685 | |
2686 | /* then clean up the resources we allocated during probe() */ | |
2687 | net2280_led_shutdown (dev); | |
2688 | if (dev->requests) { | |
2689 | int i; | |
2690 | for (i = 1; i < 5; i++) { | |
2691 | if (!dev->ep [i].dummy) | |
2692 | continue; | |
2693 | pci_pool_free (dev->requests, dev->ep [i].dummy, | |
2694 | dev->ep [i].td_dma); | |
2695 | } | |
2696 | pci_pool_destroy (dev->requests); | |
2697 | } | |
2698 | if (dev->got_irq) | |
2699 | free_irq (pdev->irq, dev); | |
2700 | if (dev->regs) | |
2701 | iounmap (dev->regs); | |
2702 | if (dev->region) | |
2703 | release_mem_region (pci_resource_start (pdev, 0), | |
2704 | pci_resource_len (pdev, 0)); | |
2705 | if (dev->enabled) | |
2706 | pci_disable_device (pdev); | |
2707 | device_unregister (&dev->gadget.dev); | |
2708 | device_remove_file (&pdev->dev, &dev_attr_registers); | |
2709 | pci_set_drvdata (pdev, NULL); | |
2710 | ||
2711 | INFO (dev, "unbind\n"); | |
2712 | ||
2713 | the_controller = NULL; | |
2714 | } | |
2715 | ||
2716 | /* wrap this driver around the specified device, but | |
2717 | * don't respond over USB until a gadget driver binds to us. | |
2718 | */ | |
2719 | ||
2720 | static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id) | |
2721 | { | |
2722 | struct net2280 *dev; | |
2723 | unsigned long resource, len; | |
2724 | void __iomem *base = NULL; | |
2725 | int retval, i; | |
1da177e4 LT |
2726 | |
2727 | /* if you want to support more than one controller in a system, | |
2728 | * usb_gadget_driver_{register,unregister}() must change. | |
2729 | */ | |
2730 | if (the_controller) { | |
2731 | dev_warn (&pdev->dev, "ignoring\n"); | |
2732 | return -EBUSY; | |
2733 | } | |
2734 | ||
2735 | /* alloc, and start init */ | |
e94b1766 | 2736 | dev = kzalloc (sizeof *dev, GFP_KERNEL); |
1da177e4 LT |
2737 | if (dev == NULL){ |
2738 | retval = -ENOMEM; | |
2739 | goto done; | |
2740 | } | |
2741 | ||
9fb81ce6 | 2742 | pci_set_drvdata (pdev, dev); |
1da177e4 LT |
2743 | spin_lock_init (&dev->lock); |
2744 | dev->pdev = pdev; | |
2745 | dev->gadget.ops = &net2280_ops; | |
2746 | dev->gadget.is_dualspeed = 1; | |
2747 | ||
2748 | /* the "gadget" abstracts/virtualizes the controller */ | |
0031a06e | 2749 | dev_set_name(&dev->gadget.dev, "gadget"); |
1da177e4 LT |
2750 | dev->gadget.dev.parent = &pdev->dev; |
2751 | dev->gadget.dev.dma_mask = pdev->dev.dma_mask; | |
2752 | dev->gadget.dev.release = gadget_release; | |
2753 | dev->gadget.name = driver_name; | |
2754 | ||
2755 | /* now all the pci goodies ... */ | |
2756 | if (pci_enable_device (pdev) < 0) { | |
901b3d75 | 2757 | retval = -ENODEV; |
1da177e4 LT |
2758 | goto done; |
2759 | } | |
2760 | dev->enabled = 1; | |
2761 | ||
2762 | /* BAR 0 holds all the registers | |
2763 | * BAR 1 is 8051 memory; unused here (note erratum 0103) | |
2764 | * BAR 2 is fifo memory; unused here | |
2765 | */ | |
2766 | resource = pci_resource_start (pdev, 0); | |
2767 | len = pci_resource_len (pdev, 0); | |
2768 | if (!request_mem_region (resource, len, driver_name)) { | |
2769 | DEBUG (dev, "controller already in use\n"); | |
2770 | retval = -EBUSY; | |
2771 | goto done; | |
2772 | } | |
2773 | dev->region = 1; | |
2774 | ||
901b3d75 DB |
2775 | /* FIXME provide firmware download interface to put |
2776 | * 8051 code into the chip, e.g. to turn on PCI PM. | |
2777 | */ | |
2778 | ||
1da177e4 LT |
2779 | base = ioremap_nocache (resource, len); |
2780 | if (base == NULL) { | |
2781 | DEBUG (dev, "can't map memory\n"); | |
2782 | retval = -EFAULT; | |
2783 | goto done; | |
2784 | } | |
2785 | dev->regs = (struct net2280_regs __iomem *) base; | |
2786 | dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080); | |
2787 | dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100); | |
2788 | dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180); | |
2789 | dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200); | |
2790 | dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300); | |
2791 | ||
2792 | /* put into initial config, link up all endpoints */ | |
2793 | writel (0, &dev->usb->usbctl); | |
2794 | usb_reset (dev); | |
2795 | usb_reinit (dev); | |
2796 | ||
2797 | /* irq setup after old hardware is cleaned up */ | |
2798 | if (!pdev->irq) { | |
2799 | ERROR (dev, "No IRQ. Check PCI setup!\n"); | |
2800 | retval = -ENODEV; | |
2801 | goto done; | |
2802 | } | |
c6387a48 | 2803 | |
d54b5caa | 2804 | if (request_irq (pdev->irq, net2280_irq, IRQF_SHARED, driver_name, dev) |
1da177e4 | 2805 | != 0) { |
c6387a48 | 2806 | ERROR (dev, "request interrupt %d failed\n", pdev->irq); |
1da177e4 LT |
2807 | retval = -EBUSY; |
2808 | goto done; | |
2809 | } | |
2810 | dev->got_irq = 1; | |
2811 | ||
2812 | /* DMA setup */ | |
2813 | /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */ | |
2814 | dev->requests = pci_pool_create ("requests", pdev, | |
2815 | sizeof (struct net2280_dma), | |
2816 | 0 /* no alignment requirements */, | |
2817 | 0 /* or page-crossing issues */); | |
2818 | if (!dev->requests) { | |
2819 | DEBUG (dev, "can't get request pool\n"); | |
2820 | retval = -ENOMEM; | |
2821 | goto done; | |
2822 | } | |
2823 | for (i = 1; i < 5; i++) { | |
2824 | struct net2280_dma *td; | |
2825 | ||
2826 | td = pci_pool_alloc (dev->requests, GFP_KERNEL, | |
2827 | &dev->ep [i].td_dma); | |
2828 | if (!td) { | |
2829 | DEBUG (dev, "can't get dummy %d\n", i); | |
2830 | retval = -ENOMEM; | |
2831 | goto done; | |
2832 | } | |
2833 | td->dmacount = 0; /* not VALID */ | |
551509d2 | 2834 | td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID); |
1da177e4 LT |
2835 | td->dmadesc = td->dmaaddr; |
2836 | dev->ep [i].dummy = td; | |
2837 | } | |
2838 | ||
2839 | /* enable lower-overhead pci memory bursts during DMA */ | |
2840 | writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) | |
2841 | // 256 write retries may not be enough... | |
2842 | // | (1 << PCI_RETRY_ABORT_ENABLE) | |
2843 | | (1 << DMA_READ_MULTIPLE_ENABLE) | |
2844 | | (1 << DMA_READ_LINE_ENABLE) | |
2845 | , &dev->pci->pcimstctl); | |
2846 | /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */ | |
2847 | pci_set_master (pdev); | |
694625c0 | 2848 | pci_try_set_mwi (pdev); |
1da177e4 LT |
2849 | |
2850 | /* ... also flushes any posted pci writes */ | |
2851 | dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff; | |
2852 | ||
2853 | /* done */ | |
1da177e4 | 2854 | INFO (dev, "%s\n", driver_desc); |
c6387a48 DM |
2855 | INFO (dev, "irq %d, pci mem %p, chip rev %04x\n", |
2856 | pdev->irq, base, dev->chiprev); | |
1da177e4 LT |
2857 | INFO (dev, "version: " DRIVER_VERSION "; dma %s\n", |
2858 | use_dma | |
2859 | ? (use_dma_chaining ? "chaining" : "enabled") | |
2860 | : "disabled"); | |
2861 | the_controller = dev; | |
2862 | ||
b3899dac JG |
2863 | retval = device_register (&dev->gadget.dev); |
2864 | if (retval) goto done; | |
2865 | retval = device_create_file (&pdev->dev, &dev_attr_registers); | |
2866 | if (retval) goto done; | |
1da177e4 | 2867 | |
0f91349b SAS |
2868 | retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget); |
2869 | if (retval) | |
2870 | goto done; | |
1da177e4 LT |
2871 | return 0; |
2872 | ||
2873 | done: | |
2874 | if (dev) | |
2875 | net2280_remove (pdev); | |
2876 | return retval; | |
2877 | } | |
2878 | ||
2d61bde7 AS |
2879 | /* make sure the board is quiescent; otherwise it will continue |
2880 | * generating IRQs across the upcoming reboot. | |
2881 | */ | |
2882 | ||
2883 | static void net2280_shutdown (struct pci_dev *pdev) | |
2884 | { | |
2885 | struct net2280 *dev = pci_get_drvdata (pdev); | |
2886 | ||
2887 | /* disable IRQs */ | |
2888 | writel (0, &dev->regs->pciirqenb0); | |
2889 | writel (0, &dev->regs->pciirqenb1); | |
2890 | ||
2891 | /* disable the pullup so the host will think we're gone */ | |
2892 | writel (0, &dev->usb->usbctl); | |
2893 | } | |
2894 | ||
1da177e4 LT |
2895 | |
2896 | /*-------------------------------------------------------------------------*/ | |
2897 | ||
901b3d75 DB |
2898 | static const struct pci_device_id pci_ids [] = { { |
2899 | .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), | |
2900 | .class_mask = ~0, | |
1da177e4 LT |
2901 | .vendor = 0x17cc, |
2902 | .device = 0x2280, | |
2903 | .subvendor = PCI_ANY_ID, | |
2904 | .subdevice = PCI_ANY_ID, | |
950ee4c8 | 2905 | }, { |
901b3d75 DB |
2906 | .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), |
2907 | .class_mask = ~0, | |
950ee4c8 GL |
2908 | .vendor = 0x17cc, |
2909 | .device = 0x2282, | |
2910 | .subvendor = PCI_ANY_ID, | |
2911 | .subdevice = PCI_ANY_ID, | |
1da177e4 LT |
2912 | |
2913 | }, { /* end: all zeroes */ } | |
2914 | }; | |
2915 | MODULE_DEVICE_TABLE (pci, pci_ids); | |
2916 | ||
2917 | /* pci driver glue; this is a "new style" PCI driver module */ | |
2918 | static struct pci_driver net2280_pci_driver = { | |
2919 | .name = (char *) driver_name, | |
2920 | .id_table = pci_ids, | |
2921 | ||
2922 | .probe = net2280_probe, | |
2923 | .remove = net2280_remove, | |
2d61bde7 | 2924 | .shutdown = net2280_shutdown, |
1da177e4 LT |
2925 | |
2926 | /* FIXME add power management support */ | |
2927 | }; | |
2928 | ||
2929 | MODULE_DESCRIPTION (DRIVER_DESC); | |
2930 | MODULE_AUTHOR ("David Brownell"); | |
2931 | MODULE_LICENSE ("GPL"); | |
2932 | ||
2933 | static int __init init (void) | |
2934 | { | |
2935 | if (!use_dma) | |
2936 | use_dma_chaining = 0; | |
2937 | return pci_register_driver (&net2280_pci_driver); | |
2938 | } | |
2939 | module_init (init); | |
2940 | ||
2941 | static void __exit cleanup (void) | |
2942 | { | |
2943 | pci_unregister_driver (&net2280_pci_driver); | |
2944 | } | |
2945 | module_exit (cleanup); |