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1da177e4 LT |
1 | /* |
2 | * Driver for the PLX NET2280 USB device controller. | |
3 | * Specs and errata are available from <http://www.plxtech.com>. | |
4 | * | |
5 | * PLX Technology Inc. (formerly NetChip Technology) supported the | |
6 | * development of this driver. | |
7 | * | |
8 | * | |
9 | * CODE STATUS HIGHLIGHTS | |
10 | * | |
11 | * This driver should work well with most "gadget" drivers, including | |
12 | * the File Storage, Serial, and Ethernet/RNDIS gadget drivers | |
13 | * as well as Gadget Zero and Gadgetfs. | |
14 | * | |
15 | * DMA is enabled by default. Drivers using transfer queues might use | |
16 | * DMA chaining to remove IRQ latencies between transfers. (Except when | |
17 | * short OUT transfers happen.) Drivers can use the req->no_interrupt | |
18 | * hint to completely eliminate some IRQs, if a later IRQ is guaranteed | |
19 | * and DMA chaining is enabled. | |
20 | * | |
21 | * Note that almost all the errata workarounds here are only needed for | |
22 | * rev1 chips. Rev1a silicon (0110) fixes almost all of them. | |
23 | */ | |
24 | ||
25 | /* | |
26 | * Copyright (C) 2003 David Brownell | |
27 | * Copyright (C) 2003-2005 PLX Technology, Inc. | |
28 | * | |
950ee4c8 GL |
29 | * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility with 2282 chip |
30 | * | |
1da177e4 LT |
31 | * This program is free software; you can redistribute it and/or modify |
32 | * it under the terms of the GNU General Public License as published by | |
33 | * the Free Software Foundation; either version 2 of the License, or | |
34 | * (at your option) any later version. | |
35 | * | |
36 | * This program is distributed in the hope that it will be useful, | |
37 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
38 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
39 | * GNU General Public License for more details. | |
40 | * | |
41 | * You should have received a copy of the GNU General Public License | |
42 | * along with this program; if not, write to the Free Software | |
43 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
44 | */ | |
45 | ||
46 | #undef DEBUG /* messages on error and most fault paths */ | |
47 | #undef VERBOSE /* extra debug messages (success too) */ | |
48 | ||
49 | #include <linux/config.h> | |
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> | |
56 | #include <linux/sched.h> | |
57 | #include <linux/slab.h> | |
58 | #include <linux/smp_lock.h> | |
59 | #include <linux/errno.h> | |
60 | #include <linux/init.h> | |
61 | #include <linux/timer.h> | |
62 | #include <linux/list.h> | |
63 | #include <linux/interrupt.h> | |
64 | #include <linux/moduleparam.h> | |
65 | #include <linux/device.h> | |
66 | #include <linux/usb_ch9.h> | |
67 | #include <linux/usb_gadget.h> | |
68 | ||
69 | #include <asm/byteorder.h> | |
70 | #include <asm/io.h> | |
71 | #include <asm/irq.h> | |
72 | #include <asm/system.h> | |
73 | #include <asm/unaligned.h> | |
74 | ||
75 | ||
950ee4c8 GL |
76 | #define DRIVER_DESC "PLX NET228x USB Peripheral Controller" |
77 | #define DRIVER_VERSION "2005 Sept 27" | |
1da177e4 LT |
78 | |
79 | #define DMA_ADDR_INVALID (~(dma_addr_t)0) | |
80 | #define EP_DONTUSE 13 /* nonzero */ | |
81 | ||
82 | #define USE_RDK_LEDS /* GPIO pins control three LEDs */ | |
83 | ||
84 | ||
85 | static const char driver_name [] = "net2280"; | |
86 | static const char driver_desc [] = DRIVER_DESC; | |
87 | ||
88 | static const char ep0name [] = "ep0"; | |
89 | static const char *ep_name [] = { | |
90 | ep0name, | |
91 | "ep-a", "ep-b", "ep-c", "ep-d", | |
92 | "ep-e", "ep-f", | |
93 | }; | |
94 | ||
95 | /* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO) | |
96 | * use_dma_chaining -- dma descriptor queueing gives even more irq reduction | |
97 | * | |
98 | * The net2280 DMA engines are not tightly integrated with their FIFOs; | |
99 | * not all cases are (yet) handled well in this driver or the silicon. | |
100 | * Some gadget drivers work better with the dma support here than others. | |
101 | * These two parameters let you use PIO or more aggressive DMA. | |
102 | */ | |
103 | static int use_dma = 1; | |
104 | static int use_dma_chaining = 0; | |
105 | ||
106 | /* "modprobe net2280 use_dma=n" etc */ | |
107 | module_param (use_dma, bool, S_IRUGO); | |
108 | module_param (use_dma_chaining, bool, S_IRUGO); | |
109 | ||
110 | ||
111 | /* mode 0 == ep-{a,b,c,d} 1K fifo each | |
112 | * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable | |
113 | * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable | |
114 | */ | |
115 | static ushort fifo_mode = 0; | |
116 | ||
117 | /* "modprobe net2280 fifo_mode=1" etc */ | |
118 | module_param (fifo_mode, ushort, 0644); | |
119 | ||
120 | /* enable_suspend -- When enabled, the driver will respond to | |
121 | * USB suspend requests by powering down the NET2280. Otherwise, | |
122 | * USB suspend requests will be ignored. This is acceptible for | |
950ee4c8 | 123 | * self-powered devices |
1da177e4 LT |
124 | */ |
125 | static int enable_suspend = 0; | |
126 | ||
127 | /* "modprobe net2280 enable_suspend=1" etc */ | |
128 | module_param (enable_suspend, bool, S_IRUGO); | |
129 | ||
130 | ||
131 | #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out") | |
132 | ||
133 | #if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG) | |
134 | static char *type_string (u8 bmAttributes) | |
135 | { | |
136 | switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) { | |
137 | case USB_ENDPOINT_XFER_BULK: return "bulk"; | |
138 | case USB_ENDPOINT_XFER_ISOC: return "iso"; | |
139 | case USB_ENDPOINT_XFER_INT: return "intr"; | |
140 | }; | |
141 | return "control"; | |
142 | } | |
143 | #endif | |
144 | ||
145 | #include "net2280.h" | |
146 | ||
147 | #define valid_bit __constant_cpu_to_le32 (1 << VALID_BIT) | |
148 | #define dma_done_ie __constant_cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE) | |
149 | ||
150 | /*-------------------------------------------------------------------------*/ | |
151 | ||
152 | static int | |
153 | net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) | |
154 | { | |
155 | struct net2280 *dev; | |
156 | struct net2280_ep *ep; | |
157 | u32 max, tmp; | |
158 | unsigned long flags; | |
159 | ||
160 | ep = container_of (_ep, struct net2280_ep, ep); | |
161 | if (!_ep || !desc || ep->desc || _ep->name == ep0name | |
162 | || desc->bDescriptorType != USB_DT_ENDPOINT) | |
163 | return -EINVAL; | |
164 | dev = ep->dev; | |
165 | if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) | |
166 | return -ESHUTDOWN; | |
167 | ||
168 | /* erratum 0119 workaround ties up an endpoint number */ | |
169 | if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) | |
170 | return -EDOM; | |
171 | ||
172 | /* sanity check ep-e/ep-f since their fifos are small */ | |
173 | max = le16_to_cpu (desc->wMaxPacketSize) & 0x1fff; | |
174 | if (ep->num > 4 && max > 64) | |
175 | return -ERANGE; | |
176 | ||
177 | spin_lock_irqsave (&dev->lock, flags); | |
178 | _ep->maxpacket = max & 0x7ff; | |
179 | ep->desc = desc; | |
180 | ||
181 | /* ep_reset() has already been called */ | |
182 | ep->stopped = 0; | |
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 GL |
228 | else if (dev->pdev->device != 0x2280) { |
229 | /* Added for 2282, Don't use nak packets on an in endpoint, this was ignored on 2280 */ | |
230 | writel ((1 << CLEAR_NAK_OUT_PACKETS) | |
231 | | (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp); | |
232 | } | |
1da177e4 LT |
233 | |
234 | writel (tmp, &ep->regs->ep_cfg); | |
235 | ||
236 | /* enable irqs */ | |
237 | if (!ep->dma) { /* pio, per-packet */ | |
238 | tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0); | |
239 | writel (tmp, &dev->regs->pciirqenb0); | |
240 | ||
241 | tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) | |
950ee4c8 GL |
242 | | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE); |
243 | if (dev->pdev->device == 0x2280) | |
244 | tmp |= readl (&ep->regs->ep_irqenb); | |
1da177e4 LT |
245 | writel (tmp, &ep->regs->ep_irqenb); |
246 | } else { /* dma, per-request */ | |
247 | tmp = (1 << (8 + ep->num)); /* completion */ | |
248 | tmp |= readl (&dev->regs->pciirqenb1); | |
249 | writel (tmp, &dev->regs->pciirqenb1); | |
250 | ||
251 | /* for short OUT transfers, dma completions can't | |
252 | * advance the queue; do it pio-style, by hand. | |
253 | * NOTE erratum 0112 workaround #2 | |
254 | */ | |
255 | if ((desc->bEndpointAddress & USB_DIR_IN) == 0) { | |
256 | tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE); | |
257 | writel (tmp, &ep->regs->ep_irqenb); | |
258 | ||
259 | tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0); | |
260 | writel (tmp, &dev->regs->pciirqenb0); | |
261 | } | |
262 | } | |
263 | ||
264 | tmp = desc->bEndpointAddress; | |
265 | DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n", | |
266 | _ep->name, tmp & 0x0f, DIR_STRING (tmp), | |
267 | type_string (desc->bmAttributes), | |
268 | ep->dma ? "dma" : "pio", max); | |
269 | ||
270 | /* pci writes may still be posted */ | |
271 | spin_unlock_irqrestore (&dev->lock, flags); | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec) | |
276 | { | |
277 | u32 result; | |
278 | ||
279 | do { | |
280 | result = readl (ptr); | |
281 | if (result == ~(u32)0) /* "device unplugged" */ | |
282 | return -ENODEV; | |
283 | result &= mask; | |
284 | if (result == done) | |
285 | return 0; | |
286 | udelay (1); | |
287 | usec--; | |
288 | } while (usec > 0); | |
289 | return -ETIMEDOUT; | |
290 | } | |
291 | ||
292 | static struct usb_ep_ops net2280_ep_ops; | |
293 | ||
294 | static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep) | |
295 | { | |
296 | u32 tmp; | |
297 | ||
298 | ep->desc = NULL; | |
299 | INIT_LIST_HEAD (&ep->queue); | |
300 | ||
301 | ep->ep.maxpacket = ~0; | |
302 | ep->ep.ops = &net2280_ep_ops; | |
303 | ||
304 | /* disable the dma, irqs, endpoint... */ | |
305 | if (ep->dma) { | |
306 | writel (0, &ep->dma->dmactl); | |
307 | writel ( (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT) | |
308 | | (1 << DMA_TRANSACTION_DONE_INTERRUPT) | |
309 | | (1 << DMA_ABORT) | |
310 | , &ep->dma->dmastat); | |
311 | ||
312 | tmp = readl (®s->pciirqenb0); | |
313 | tmp &= ~(1 << ep->num); | |
314 | writel (tmp, ®s->pciirqenb0); | |
315 | } else { | |
316 | tmp = readl (®s->pciirqenb1); | |
317 | tmp &= ~(1 << (8 + ep->num)); /* completion */ | |
318 | writel (tmp, ®s->pciirqenb1); | |
319 | } | |
320 | writel (0, &ep->regs->ep_irqenb); | |
321 | ||
322 | /* init to our chosen defaults, notably so that we NAK OUT | |
323 | * packets until the driver queues a read (+note erratum 0112) | |
324 | */ | |
950ee4c8 GL |
325 | if (!ep->is_in || ep->dev->pdev->device == 0x2280) { |
326 | tmp = (1 << SET_NAK_OUT_PACKETS_MODE) | |
1da177e4 LT |
327 | | (1 << SET_NAK_OUT_PACKETS) |
328 | | (1 << CLEAR_EP_HIDE_STATUS_PHASE) | |
329 | | (1 << CLEAR_INTERRUPT_MODE); | |
950ee4c8 GL |
330 | } else { |
331 | /* added for 2282 */ | |
332 | tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE) | |
333 | | (1 << CLEAR_NAK_OUT_PACKETS) | |
334 | | (1 << CLEAR_EP_HIDE_STATUS_PHASE) | |
335 | | (1 << CLEAR_INTERRUPT_MODE); | |
336 | } | |
1da177e4 LT |
337 | |
338 | if (ep->num != 0) { | |
339 | tmp |= (1 << CLEAR_ENDPOINT_TOGGLE) | |
340 | | (1 << CLEAR_ENDPOINT_HALT); | |
341 | } | |
342 | writel (tmp, &ep->regs->ep_rsp); | |
343 | ||
344 | /* scrub most status bits, and flush any fifo state */ | |
950ee4c8 GL |
345 | if (ep->dev->pdev->device == 0x2280) |
346 | tmp = (1 << FIFO_OVERFLOW) | |
347 | | (1 << FIFO_UNDERFLOW); | |
348 | else | |
349 | tmp = 0; | |
350 | ||
351 | writel (tmp | (1 << TIMEOUT) | |
1da177e4 LT |
352 | | (1 << USB_STALL_SENT) |
353 | | (1 << USB_IN_NAK_SENT) | |
354 | | (1 << USB_IN_ACK_RCVD) | |
355 | | (1 << USB_OUT_PING_NAK_SENT) | |
356 | | (1 << USB_OUT_ACK_SENT) | |
1da177e4 LT |
357 | | (1 << FIFO_FLUSH) |
358 | | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT) | |
359 | | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) | |
360 | | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
361 | | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | |
362 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
363 | | (1 << DATA_IN_TOKEN_INTERRUPT) | |
364 | , &ep->regs->ep_stat); | |
365 | ||
366 | /* fifo size is handled separately */ | |
367 | } | |
368 | ||
369 | static void nuke (struct net2280_ep *); | |
370 | ||
371 | static int net2280_disable (struct usb_ep *_ep) | |
372 | { | |
373 | struct net2280_ep *ep; | |
374 | unsigned long flags; | |
375 | ||
376 | ep = container_of (_ep, struct net2280_ep, ep); | |
377 | if (!_ep || !ep->desc || _ep->name == ep0name) | |
378 | return -EINVAL; | |
379 | ||
380 | spin_lock_irqsave (&ep->dev->lock, flags); | |
381 | nuke (ep); | |
382 | ep_reset (ep->dev->regs, ep); | |
383 | ||
384 | VDEBUG (ep->dev, "disabled %s %s\n", | |
385 | ep->dma ? "dma" : "pio", _ep->name); | |
386 | ||
387 | /* synch memory views with the device */ | |
388 | (void) readl (&ep->regs->ep_cfg); | |
389 | ||
390 | if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4) | |
391 | ep->dma = &ep->dev->dma [ep->num - 1]; | |
392 | ||
393 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
394 | return 0; | |
395 | } | |
396 | ||
397 | /*-------------------------------------------------------------------------*/ | |
398 | ||
399 | static struct usb_request * | |
55016f10 | 400 | net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags) |
1da177e4 LT |
401 | { |
402 | struct net2280_ep *ep; | |
403 | struct net2280_request *req; | |
404 | ||
405 | if (!_ep) | |
406 | return NULL; | |
407 | ep = container_of (_ep, struct net2280_ep, ep); | |
408 | ||
7039f422 | 409 | req = kzalloc(sizeof(*req), gfp_flags); |
1da177e4 LT |
410 | if (!req) |
411 | return NULL; | |
412 | ||
1da177e4 LT |
413 | req->req.dma = DMA_ADDR_INVALID; |
414 | INIT_LIST_HEAD (&req->queue); | |
415 | ||
416 | /* this dma descriptor may be swapped with the previous dummy */ | |
417 | if (ep->dma) { | |
418 | struct net2280_dma *td; | |
419 | ||
420 | td = pci_pool_alloc (ep->dev->requests, gfp_flags, | |
421 | &req->td_dma); | |
422 | if (!td) { | |
423 | kfree (req); | |
424 | return NULL; | |
425 | } | |
426 | td->dmacount = 0; /* not VALID */ | |
427 | td->dmaaddr = __constant_cpu_to_le32 (DMA_ADDR_INVALID); | |
428 | td->dmadesc = td->dmaaddr; | |
429 | req->td = td; | |
430 | } | |
431 | return &req->req; | |
432 | } | |
433 | ||
434 | static void | |
435 | net2280_free_request (struct usb_ep *_ep, struct usb_request *_req) | |
436 | { | |
437 | struct net2280_ep *ep; | |
438 | struct net2280_request *req; | |
439 | ||
440 | ep = container_of (_ep, struct net2280_ep, ep); | |
441 | if (!_ep || !_req) | |
442 | return; | |
443 | ||
444 | req = container_of (_req, struct net2280_request, req); | |
445 | WARN_ON (!list_empty (&req->queue)); | |
446 | if (req->td) | |
447 | pci_pool_free (ep->dev->requests, req->td, req->td_dma); | |
448 | kfree (req); | |
449 | } | |
450 | ||
451 | /*-------------------------------------------------------------------------*/ | |
452 | ||
453 | #undef USE_KMALLOC | |
454 | ||
455 | /* many common platforms have dma-coherent caches, which means that it's | |
456 | * safe to use kmalloc() memory for all i/o buffers without using any | |
457 | * cache flushing calls. (unless you're trying to share cache lines | |
458 | * between dma and non-dma activities, which is a slow idea in any case.) | |
459 | * | |
460 | * other platforms need more care, with 2.5 having a moderately general | |
461 | * solution (which falls down for allocations smaller than one page) | |
462 | * that improves significantly on the 2.4 PCI allocators by removing | |
463 | * the restriction that memory never be freed in_interrupt(). | |
464 | */ | |
465 | #if defined(CONFIG_X86) | |
466 | #define USE_KMALLOC | |
467 | ||
468 | #elif defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE) | |
469 | #define USE_KMALLOC | |
470 | ||
320f3459 | 471 | #elif defined(CONFIG_MIPS) && !defined(CONFIG_DMA_NONCOHERENT) |
1da177e4 LT |
472 | #define USE_KMALLOC |
473 | ||
474 | /* FIXME there are other cases, including an x86-64 one ... */ | |
475 | #endif | |
476 | ||
477 | /* allocating buffers this way eliminates dma mapping overhead, which | |
478 | * on some platforms will mean eliminating a per-io buffer copy. with | |
479 | * some kinds of system caches, further tweaks may still be needed. | |
480 | */ | |
481 | static void * | |
482 | net2280_alloc_buffer ( | |
483 | struct usb_ep *_ep, | |
484 | unsigned bytes, | |
485 | dma_addr_t *dma, | |
55016f10 | 486 | gfp_t gfp_flags |
1da177e4 LT |
487 | ) |
488 | { | |
489 | void *retval; | |
490 | struct net2280_ep *ep; | |
491 | ||
492 | ep = container_of (_ep, struct net2280_ep, ep); | |
493 | if (!_ep) | |
494 | return NULL; | |
495 | *dma = DMA_ADDR_INVALID; | |
496 | ||
497 | #if defined(USE_KMALLOC) | |
498 | retval = kmalloc(bytes, gfp_flags); | |
499 | if (retval) | |
500 | *dma = virt_to_phys(retval); | |
501 | #else | |
502 | if (ep->dma) { | |
503 | /* the main problem with this call is that it wastes memory | |
504 | * on typical 1/N page allocations: it allocates 1-N pages. | |
505 | */ | |
506 | #warning Using dma_alloc_coherent even with buffers smaller than a page. | |
507 | retval = dma_alloc_coherent(&ep->dev->pdev->dev, | |
508 | bytes, dma, gfp_flags); | |
509 | } else | |
510 | retval = kmalloc(bytes, gfp_flags); | |
511 | #endif | |
512 | return retval; | |
513 | } | |
514 | ||
515 | static void | |
516 | net2280_free_buffer ( | |
517 | struct usb_ep *_ep, | |
518 | void *buf, | |
519 | dma_addr_t dma, | |
520 | unsigned bytes | |
521 | ) { | |
522 | /* free memory into the right allocator */ | |
523 | #ifndef USE_KMALLOC | |
524 | if (dma != DMA_ADDR_INVALID) { | |
525 | struct net2280_ep *ep; | |
526 | ||
527 | ep = container_of(_ep, struct net2280_ep, ep); | |
528 | if (!_ep) | |
529 | return; | |
530 | dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma); | |
531 | } else | |
532 | #endif | |
533 | kfree (buf); | |
534 | } | |
535 | ||
536 | /*-------------------------------------------------------------------------*/ | |
537 | ||
538 | /* load a packet into the fifo we use for usb IN transfers. | |
539 | * works for all endpoints. | |
540 | * | |
541 | * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo | |
542 | * at a time, but this code is simpler because it knows it only writes | |
543 | * one packet. ep-a..ep-d should use dma instead. | |
544 | */ | |
545 | static void | |
546 | write_fifo (struct net2280_ep *ep, struct usb_request *req) | |
547 | { | |
548 | struct net2280_ep_regs __iomem *regs = ep->regs; | |
549 | u8 *buf; | |
550 | u32 tmp; | |
551 | unsigned count, total; | |
552 | ||
553 | /* INVARIANT: fifo is currently empty. (testable) */ | |
554 | ||
555 | if (req) { | |
556 | buf = req->buf + req->actual; | |
557 | prefetch (buf); | |
558 | total = req->length - req->actual; | |
559 | } else { | |
560 | total = 0; | |
561 | buf = NULL; | |
562 | } | |
563 | ||
564 | /* write just one packet at a time */ | |
565 | count = ep->ep.maxpacket; | |
566 | if (count > total) /* min() cannot be used on a bitfield */ | |
567 | count = total; | |
568 | ||
569 | VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n", | |
570 | ep->ep.name, count, | |
571 | (count != ep->ep.maxpacket) ? " (short)" : "", | |
572 | req); | |
573 | while (count >= 4) { | |
574 | /* NOTE be careful if you try to align these. fifo lines | |
575 | * should normally be full (4 bytes) and successive partial | |
576 | * lines are ok only in certain cases. | |
577 | */ | |
578 | tmp = get_unaligned ((u32 *)buf); | |
579 | cpu_to_le32s (&tmp); | |
580 | writel (tmp, ®s->ep_data); | |
581 | buf += 4; | |
582 | count -= 4; | |
583 | } | |
584 | ||
585 | /* last fifo entry is "short" unless we wrote a full packet. | |
586 | * also explicitly validate last word in (periodic) transfers | |
587 | * when maxpacket is not a multiple of 4 bytes. | |
588 | */ | |
589 | if (count || total < ep->ep.maxpacket) { | |
590 | tmp = count ? get_unaligned ((u32 *)buf) : count; | |
591 | cpu_to_le32s (&tmp); | |
592 | set_fifo_bytecount (ep, count & 0x03); | |
593 | writel (tmp, ®s->ep_data); | |
594 | } | |
595 | ||
596 | /* pci writes may still be posted */ | |
597 | } | |
598 | ||
599 | /* work around erratum 0106: PCI and USB race over the OUT fifo. | |
600 | * caller guarantees chiprev 0100, out endpoint is NAKing, and | |
601 | * there's no real data in the fifo. | |
602 | * | |
603 | * NOTE: also used in cases where that erratum doesn't apply: | |
604 | * where the host wrote "too much" data to us. | |
605 | */ | |
606 | static void out_flush (struct net2280_ep *ep) | |
607 | { | |
608 | u32 __iomem *statp; | |
609 | u32 tmp; | |
610 | ||
611 | ASSERT_OUT_NAKING (ep); | |
612 | ||
613 | statp = &ep->regs->ep_stat; | |
614 | writel ( (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
615 | | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
616 | , statp); | |
617 | writel ((1 << FIFO_FLUSH), statp); | |
618 | mb (); | |
619 | tmp = readl (statp); | |
620 | if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
621 | /* high speed did bulk NYET; fifo isn't filling */ | |
622 | && ep->dev->gadget.speed == USB_SPEED_FULL) { | |
623 | unsigned usec; | |
624 | ||
625 | usec = 50; /* 64 byte bulk/interrupt */ | |
626 | handshake (statp, (1 << USB_OUT_PING_NAK_SENT), | |
627 | (1 << USB_OUT_PING_NAK_SENT), usec); | |
628 | /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */ | |
629 | } | |
630 | } | |
631 | ||
632 | /* unload packet(s) from the fifo we use for usb OUT transfers. | |
633 | * returns true iff the request completed, because of short packet | |
634 | * or the request buffer having filled with full packets. | |
635 | * | |
636 | * for ep-a..ep-d this will read multiple packets out when they | |
637 | * have been accepted. | |
638 | */ | |
639 | static int | |
640 | read_fifo (struct net2280_ep *ep, struct net2280_request *req) | |
641 | { | |
642 | struct net2280_ep_regs __iomem *regs = ep->regs; | |
643 | u8 *buf = req->req.buf + req->req.actual; | |
644 | unsigned count, tmp, is_short; | |
645 | unsigned cleanup = 0, prevent = 0; | |
646 | ||
647 | /* erratum 0106 ... packets coming in during fifo reads might | |
648 | * be incompletely rejected. not all cases have workarounds. | |
649 | */ | |
650 | if (ep->dev->chiprev == 0x0100 | |
651 | && ep->dev->gadget.speed == USB_SPEED_FULL) { | |
652 | udelay (1); | |
653 | tmp = readl (&ep->regs->ep_stat); | |
654 | if ((tmp & (1 << NAK_OUT_PACKETS))) | |
655 | cleanup = 1; | |
656 | else if ((tmp & (1 << FIFO_FULL))) { | |
657 | start_out_naking (ep); | |
658 | prevent = 1; | |
659 | } | |
660 | /* else: hope we don't see the problem */ | |
661 | } | |
662 | ||
663 | /* never overflow the rx buffer. the fifo reads packets until | |
664 | * it sees a short one; we might not be ready for them all. | |
665 | */ | |
666 | prefetchw (buf); | |
667 | count = readl (®s->ep_avail); | |
668 | if (unlikely (count == 0)) { | |
669 | udelay (1); | |
670 | tmp = readl (&ep->regs->ep_stat); | |
671 | count = readl (®s->ep_avail); | |
672 | /* handled that data already? */ | |
673 | if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0) | |
674 | return 0; | |
675 | } | |
676 | ||
677 | tmp = req->req.length - req->req.actual; | |
678 | if (count > tmp) { | |
679 | /* as with DMA, data overflow gets flushed */ | |
680 | if ((tmp % ep->ep.maxpacket) != 0) { | |
681 | ERROR (ep->dev, | |
682 | "%s out fifo %d bytes, expected %d\n", | |
683 | ep->ep.name, count, tmp); | |
684 | req->req.status = -EOVERFLOW; | |
685 | cleanup = 1; | |
686 | /* NAK_OUT_PACKETS will be set, so flushing is safe; | |
687 | * the next read will start with the next packet | |
688 | */ | |
689 | } /* else it's a ZLP, no worries */ | |
690 | count = tmp; | |
691 | } | |
692 | req->req.actual += count; | |
693 | ||
694 | is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0); | |
695 | ||
696 | VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n", | |
697 | ep->ep.name, count, is_short ? " (short)" : "", | |
698 | cleanup ? " flush" : "", prevent ? " nak" : "", | |
699 | req, req->req.actual, req->req.length); | |
700 | ||
701 | while (count >= 4) { | |
702 | tmp = readl (®s->ep_data); | |
703 | cpu_to_le32s (&tmp); | |
704 | put_unaligned (tmp, (u32 *)buf); | |
705 | buf += 4; | |
706 | count -= 4; | |
707 | } | |
708 | if (count) { | |
709 | tmp = readl (®s->ep_data); | |
710 | /* LE conversion is implicit here: */ | |
711 | do { | |
712 | *buf++ = (u8) tmp; | |
713 | tmp >>= 8; | |
714 | } while (--count); | |
715 | } | |
716 | if (cleanup) | |
717 | out_flush (ep); | |
718 | if (prevent) { | |
719 | writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp); | |
720 | (void) readl (&ep->regs->ep_rsp); | |
721 | } | |
722 | ||
723 | return is_short || ((req->req.actual == req->req.length) | |
724 | && !req->req.zero); | |
725 | } | |
726 | ||
727 | /* fill out dma descriptor to match a given request */ | |
728 | static void | |
729 | fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid) | |
730 | { | |
731 | struct net2280_dma *td = req->td; | |
732 | u32 dmacount = req->req.length; | |
733 | ||
734 | /* don't let DMA continue after a short OUT packet, | |
735 | * so overruns can't affect the next transfer. | |
736 | * in case of overruns on max-size packets, we can't | |
737 | * stop the fifo from filling but we can flush it. | |
738 | */ | |
739 | if (ep->is_in) | |
740 | dmacount |= (1 << DMA_DIRECTION); | |
950ee4c8 | 741 | if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) || ep->dev->pdev->device != 0x2280) |
1da177e4 LT |
742 | dmacount |= (1 << END_OF_CHAIN); |
743 | ||
744 | req->valid = valid; | |
745 | if (valid) | |
746 | dmacount |= (1 << VALID_BIT); | |
747 | if (likely(!req->req.no_interrupt || !use_dma_chaining)) | |
748 | dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE); | |
749 | ||
750 | /* td->dmadesc = previously set by caller */ | |
751 | td->dmaaddr = cpu_to_le32 (req->req.dma); | |
752 | ||
753 | /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */ | |
754 | wmb (); | |
755 | td->dmacount = cpu_to_le32p (&dmacount); | |
756 | } | |
757 | ||
758 | static const u32 dmactl_default = | |
759 | (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT) | |
760 | | (1 << DMA_CLEAR_COUNT_ENABLE) | |
761 | /* erratum 0116 workaround part 1 (use POLLING) */ | |
762 | | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) | |
763 | | (1 << DMA_VALID_BIT_POLLING_ENABLE) | |
764 | | (1 << DMA_VALID_BIT_ENABLE) | |
765 | | (1 << DMA_SCATTER_GATHER_ENABLE) | |
766 | /* erratum 0116 workaround part 2 (no AUTOSTART) */ | |
767 | | (1 << DMA_ENABLE); | |
768 | ||
769 | static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma) | |
770 | { | |
771 | handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50); | |
772 | } | |
773 | ||
774 | static inline void stop_dma (struct net2280_dma_regs __iomem *dma) | |
775 | { | |
776 | writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl); | |
777 | spin_stop_dma (dma); | |
778 | } | |
779 | ||
780 | static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma) | |
781 | { | |
782 | struct net2280_dma_regs __iomem *dma = ep->dma; | |
950ee4c8 | 783 | unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION); |
1da177e4 | 784 | |
950ee4c8 GL |
785 | if (ep->dev->pdev->device != 0x2280) |
786 | tmp |= (1 << END_OF_CHAIN); | |
787 | ||
788 | writel (tmp, &dma->dmacount); | |
1da177e4 LT |
789 | writel (readl (&dma->dmastat), &dma->dmastat); |
790 | ||
791 | writel (td_dma, &dma->dmadesc); | |
792 | writel (dmactl, &dma->dmactl); | |
793 | ||
794 | /* erratum 0116 workaround part 3: pci arbiter away from net2280 */ | |
795 | (void) readl (&ep->dev->pci->pcimstctl); | |
796 | ||
797 | writel ((1 << DMA_START), &dma->dmastat); | |
798 | ||
799 | if (!ep->is_in) | |
800 | stop_out_naking (ep); | |
801 | } | |
802 | ||
803 | static void start_dma (struct net2280_ep *ep, struct net2280_request *req) | |
804 | { | |
805 | u32 tmp; | |
806 | struct net2280_dma_regs __iomem *dma = ep->dma; | |
807 | ||
808 | /* FIXME can't use DMA for ZLPs */ | |
809 | ||
810 | /* on this path we "know" there's no dma active (yet) */ | |
811 | WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE)); | |
812 | writel (0, &ep->dma->dmactl); | |
813 | ||
814 | /* previous OUT packet might have been short */ | |
815 | if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat)) | |
816 | & (1 << NAK_OUT_PACKETS)) != 0) { | |
817 | writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT), | |
818 | &ep->regs->ep_stat); | |
819 | ||
820 | tmp = readl (&ep->regs->ep_avail); | |
821 | if (tmp) { | |
822 | writel (readl (&dma->dmastat), &dma->dmastat); | |
823 | ||
824 | /* transfer all/some fifo data */ | |
825 | writel (req->req.dma, &dma->dmaaddr); | |
826 | tmp = min (tmp, req->req.length); | |
827 | ||
828 | /* dma irq, faking scatterlist status */ | |
829 | req->td->dmacount = cpu_to_le32 (req->req.length - tmp); | |
830 | writel ((1 << DMA_DONE_INTERRUPT_ENABLE) | |
831 | | tmp, &dma->dmacount); | |
832 | req->td->dmadesc = 0; | |
833 | req->valid = 1; | |
834 | ||
835 | writel ((1 << DMA_ENABLE), &dma->dmactl); | |
836 | writel ((1 << DMA_START), &dma->dmastat); | |
837 | return; | |
838 | } | |
839 | } | |
840 | ||
841 | tmp = dmactl_default; | |
842 | ||
843 | /* force packet boundaries between dma requests, but prevent the | |
844 | * controller from automagically writing a last "short" packet | |
845 | * (zero length) unless the driver explicitly said to do that. | |
846 | */ | |
847 | if (ep->is_in) { | |
848 | if (likely ((req->req.length % ep->ep.maxpacket) != 0 | |
849 | || req->req.zero)) { | |
850 | tmp |= (1 << DMA_FIFO_VALIDATE); | |
851 | ep->in_fifo_validate = 1; | |
852 | } else | |
853 | ep->in_fifo_validate = 0; | |
854 | } | |
855 | ||
856 | /* init req->td, pointing to the current dummy */ | |
857 | req->td->dmadesc = cpu_to_le32 (ep->td_dma); | |
858 | fill_dma_desc (ep, req, 1); | |
859 | ||
860 | if (!use_dma_chaining) | |
861 | req->td->dmacount |= __constant_cpu_to_le32 (1 << END_OF_CHAIN); | |
862 | ||
863 | start_queue (ep, tmp, req->td_dma); | |
864 | } | |
865 | ||
866 | static inline void | |
867 | queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid) | |
868 | { | |
869 | struct net2280_dma *end; | |
870 | dma_addr_t tmp; | |
871 | ||
872 | /* swap new dummy for old, link; fill and maybe activate */ | |
873 | end = ep->dummy; | |
874 | ep->dummy = req->td; | |
875 | req->td = end; | |
876 | ||
877 | tmp = ep->td_dma; | |
878 | ep->td_dma = req->td_dma; | |
879 | req->td_dma = tmp; | |
880 | ||
881 | end->dmadesc = cpu_to_le32 (ep->td_dma); | |
882 | ||
883 | fill_dma_desc (ep, req, valid); | |
884 | } | |
885 | ||
886 | static void | |
887 | done (struct net2280_ep *ep, struct net2280_request *req, int status) | |
888 | { | |
889 | struct net2280 *dev; | |
890 | unsigned stopped = ep->stopped; | |
891 | ||
892 | list_del_init (&req->queue); | |
893 | ||
894 | if (req->req.status == -EINPROGRESS) | |
895 | req->req.status = status; | |
896 | else | |
897 | status = req->req.status; | |
898 | ||
899 | dev = ep->dev; | |
900 | if (req->mapped) { | |
901 | pci_unmap_single (dev->pdev, req->req.dma, req->req.length, | |
902 | ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); | |
903 | req->req.dma = DMA_ADDR_INVALID; | |
904 | req->mapped = 0; | |
905 | } | |
906 | ||
907 | if (status && status != -ESHUTDOWN) | |
908 | VDEBUG (dev, "complete %s req %p stat %d len %u/%u\n", | |
909 | ep->ep.name, &req->req, status, | |
910 | req->req.actual, req->req.length); | |
911 | ||
912 | /* don't modify queue heads during completion callback */ | |
913 | ep->stopped = 1; | |
914 | spin_unlock (&dev->lock); | |
915 | req->req.complete (&ep->ep, &req->req); | |
916 | spin_lock (&dev->lock); | |
917 | ep->stopped = stopped; | |
918 | } | |
919 | ||
920 | /*-------------------------------------------------------------------------*/ | |
921 | ||
922 | static int | |
55016f10 | 923 | net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) |
1da177e4 LT |
924 | { |
925 | struct net2280_request *req; | |
926 | struct net2280_ep *ep; | |
927 | struct net2280 *dev; | |
928 | unsigned long flags; | |
929 | ||
930 | /* we always require a cpu-view buffer, so that we can | |
931 | * always use pio (as fallback or whatever). | |
932 | */ | |
933 | req = container_of (_req, struct net2280_request, req); | |
934 | if (!_req || !_req->complete || !_req->buf | |
935 | || !list_empty (&req->queue)) | |
936 | return -EINVAL; | |
937 | if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) | |
938 | return -EDOM; | |
939 | ep = container_of (_ep, struct net2280_ep, ep); | |
940 | if (!_ep || (!ep->desc && ep->num != 0)) | |
941 | return -EINVAL; | |
942 | dev = ep->dev; | |
943 | if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) | |
944 | return -ESHUTDOWN; | |
945 | ||
946 | /* FIXME implement PIO fallback for ZLPs with DMA */ | |
947 | if (ep->dma && _req->length == 0) | |
948 | return -EOPNOTSUPP; | |
949 | ||
950 | /* set up dma mapping in case the caller didn't */ | |
951 | if (ep->dma && _req->dma == DMA_ADDR_INVALID) { | |
952 | _req->dma = pci_map_single (dev->pdev, _req->buf, _req->length, | |
953 | ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); | |
954 | req->mapped = 1; | |
955 | } | |
956 | ||
957 | #if 0 | |
958 | VDEBUG (dev, "%s queue req %p, len %d buf %p\n", | |
959 | _ep->name, _req, _req->length, _req->buf); | |
960 | #endif | |
961 | ||
962 | spin_lock_irqsave (&dev->lock, flags); | |
963 | ||
964 | _req->status = -EINPROGRESS; | |
965 | _req->actual = 0; | |
966 | ||
967 | /* kickstart this i/o queue? */ | |
968 | if (list_empty (&ep->queue) && !ep->stopped) { | |
969 | /* use DMA if the endpoint supports it, else pio */ | |
970 | if (ep->dma) | |
971 | start_dma (ep, req); | |
972 | else { | |
973 | /* maybe there's no control data, just status ack */ | |
974 | if (ep->num == 0 && _req->length == 0) { | |
975 | allow_status (ep); | |
976 | done (ep, req, 0); | |
977 | VDEBUG (dev, "%s status ack\n", ep->ep.name); | |
978 | goto done; | |
979 | } | |
980 | ||
981 | /* PIO ... stuff the fifo, or unblock it. */ | |
982 | if (ep->is_in) | |
983 | write_fifo (ep, _req); | |
984 | else if (list_empty (&ep->queue)) { | |
985 | u32 s; | |
986 | ||
987 | /* OUT FIFO might have packet(s) buffered */ | |
988 | s = readl (&ep->regs->ep_stat); | |
989 | if ((s & (1 << FIFO_EMPTY)) == 0) { | |
990 | /* note: _req->short_not_ok is | |
991 | * ignored here since PIO _always_ | |
992 | * stops queue advance here, and | |
993 | * _req->status doesn't change for | |
994 | * short reads (only _req->actual) | |
995 | */ | |
996 | if (read_fifo (ep, req)) { | |
997 | done (ep, req, 0); | |
998 | if (ep->num == 0) | |
999 | allow_status (ep); | |
1000 | /* don't queue it */ | |
1001 | req = NULL; | |
1002 | } else | |
1003 | s = readl (&ep->regs->ep_stat); | |
1004 | } | |
1005 | ||
1006 | /* don't NAK, let the fifo fill */ | |
1007 | if (req && (s & (1 << NAK_OUT_PACKETS))) | |
1008 | writel ((1 << CLEAR_NAK_OUT_PACKETS), | |
1009 | &ep->regs->ep_rsp); | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | } else if (ep->dma) { | |
1014 | int valid = 1; | |
1015 | ||
1016 | if (ep->is_in) { | |
1017 | int expect; | |
1018 | ||
1019 | /* preventing magic zlps is per-engine state, not | |
1020 | * per-transfer; irq logic must recover hiccups. | |
1021 | */ | |
1022 | expect = likely (req->req.zero | |
1023 | || (req->req.length % ep->ep.maxpacket) != 0); | |
1024 | if (expect != ep->in_fifo_validate) | |
1025 | valid = 0; | |
1026 | } | |
1027 | queue_dma (ep, req, valid); | |
1028 | ||
1029 | } /* else the irq handler advances the queue. */ | |
1030 | ||
1031 | if (req) | |
1032 | list_add_tail (&req->queue, &ep->queue); | |
1033 | done: | |
1034 | spin_unlock_irqrestore (&dev->lock, flags); | |
1035 | ||
1036 | /* pci writes may still be posted */ | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | static inline void | |
1041 | dma_done ( | |
1042 | struct net2280_ep *ep, | |
1043 | struct net2280_request *req, | |
1044 | u32 dmacount, | |
1045 | int status | |
1046 | ) | |
1047 | { | |
1048 | req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount); | |
1049 | done (ep, req, status); | |
1050 | } | |
1051 | ||
1052 | static void restart_dma (struct net2280_ep *ep); | |
1053 | ||
1054 | static void scan_dma_completions (struct net2280_ep *ep) | |
1055 | { | |
1056 | /* only look at descriptors that were "naturally" retired, | |
1057 | * so fifo and list head state won't matter | |
1058 | */ | |
1059 | while (!list_empty (&ep->queue)) { | |
1060 | struct net2280_request *req; | |
1061 | u32 tmp; | |
1062 | ||
1063 | req = list_entry (ep->queue.next, | |
1064 | struct net2280_request, queue); | |
1065 | if (!req->valid) | |
1066 | break; | |
1067 | rmb (); | |
1068 | tmp = le32_to_cpup (&req->td->dmacount); | |
1069 | if ((tmp & (1 << VALID_BIT)) != 0) | |
1070 | break; | |
1071 | ||
1072 | /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short" | |
1073 | * cases where DMA must be aborted; this code handles | |
1074 | * all non-abort DMA completions. | |
1075 | */ | |
1076 | if (unlikely (req->td->dmadesc == 0)) { | |
1077 | /* paranoia */ | |
1078 | tmp = readl (&ep->dma->dmacount); | |
1079 | if (tmp & DMA_BYTE_COUNT_MASK) | |
1080 | break; | |
1081 | /* single transfer mode */ | |
1082 | dma_done (ep, req, tmp, 0); | |
1083 | break; | |
1084 | } else if (!ep->is_in | |
1085 | && (req->req.length % ep->ep.maxpacket) != 0) { | |
1086 | tmp = readl (&ep->regs->ep_stat); | |
1087 | ||
1088 | /* AVOID TROUBLE HERE by not issuing short reads from | |
1089 | * your gadget driver. That helps avoids errata 0121, | |
1090 | * 0122, and 0124; not all cases trigger the warning. | |
1091 | */ | |
1092 | if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) { | |
1093 | WARN (ep->dev, "%s lost packet sync!\n", | |
1094 | ep->ep.name); | |
1095 | req->req.status = -EOVERFLOW; | |
1096 | } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) { | |
1097 | /* fifo gets flushed later */ | |
1098 | ep->out_overflow = 1; | |
1099 | DEBUG (ep->dev, "%s dma, discard %d len %d\n", | |
1100 | ep->ep.name, tmp, | |
1101 | req->req.length); | |
1102 | req->req.status = -EOVERFLOW; | |
1103 | } | |
1104 | } | |
1105 | dma_done (ep, req, tmp, 0); | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | static void restart_dma (struct net2280_ep *ep) | |
1110 | { | |
1111 | struct net2280_request *req; | |
1112 | u32 dmactl = dmactl_default; | |
1113 | ||
1114 | if (ep->stopped) | |
1115 | return; | |
1116 | req = list_entry (ep->queue.next, struct net2280_request, queue); | |
1117 | ||
1118 | if (!use_dma_chaining) { | |
1119 | start_dma (ep, req); | |
1120 | return; | |
1121 | } | |
1122 | ||
1123 | /* the 2280 will be processing the queue unless queue hiccups after | |
1124 | * the previous transfer: | |
1125 | * IN: wanted automagic zlp, head doesn't (or vice versa) | |
1126 | * DMA_FIFO_VALIDATE doesn't init from dma descriptors. | |
1127 | * OUT: was "usb-short", we must restart. | |
1128 | */ | |
1129 | if (ep->is_in && !req->valid) { | |
1130 | struct net2280_request *entry, *prev = NULL; | |
1131 | int reqmode, done = 0; | |
1132 | ||
1133 | DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td); | |
1134 | ep->in_fifo_validate = likely (req->req.zero | |
1135 | || (req->req.length % ep->ep.maxpacket) != 0); | |
1136 | if (ep->in_fifo_validate) | |
1137 | dmactl |= (1 << DMA_FIFO_VALIDATE); | |
1138 | list_for_each_entry (entry, &ep->queue, queue) { | |
320f3459 | 1139 | __le32 dmacount; |
1da177e4 LT |
1140 | |
1141 | if (entry == req) | |
1142 | continue; | |
1143 | dmacount = entry->td->dmacount; | |
1144 | if (!done) { | |
1145 | reqmode = likely (entry->req.zero | |
1146 | || (entry->req.length | |
1147 | % ep->ep.maxpacket) != 0); | |
1148 | if (reqmode == ep->in_fifo_validate) { | |
1149 | entry->valid = 1; | |
1150 | dmacount |= valid_bit; | |
1151 | entry->td->dmacount = dmacount; | |
1152 | prev = entry; | |
1153 | continue; | |
1154 | } else { | |
1155 | /* force a hiccup */ | |
1156 | prev->td->dmacount |= dma_done_ie; | |
1157 | done = 1; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | /* walk the rest of the queue so unlinks behave */ | |
1162 | entry->valid = 0; | |
1163 | dmacount &= ~valid_bit; | |
1164 | entry->td->dmacount = dmacount; | |
1165 | prev = entry; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | writel (0, &ep->dma->dmactl); | |
1170 | start_queue (ep, dmactl, req->td_dma); | |
1171 | } | |
1172 | ||
1173 | static void abort_dma (struct net2280_ep *ep) | |
1174 | { | |
1175 | /* abort the current transfer */ | |
1176 | if (likely (!list_empty (&ep->queue))) { | |
1177 | /* FIXME work around errata 0121, 0122, 0124 */ | |
1178 | writel ((1 << DMA_ABORT), &ep->dma->dmastat); | |
1179 | spin_stop_dma (ep->dma); | |
1180 | } else | |
1181 | stop_dma (ep->dma); | |
1182 | scan_dma_completions (ep); | |
1183 | } | |
1184 | ||
1185 | /* dequeue ALL requests */ | |
1186 | static void nuke (struct net2280_ep *ep) | |
1187 | { | |
1188 | struct net2280_request *req; | |
1189 | ||
1190 | /* called with spinlock held */ | |
1191 | ep->stopped = 1; | |
1192 | if (ep->dma) | |
1193 | abort_dma (ep); | |
1194 | while (!list_empty (&ep->queue)) { | |
1195 | req = list_entry (ep->queue.next, | |
1196 | struct net2280_request, | |
1197 | queue); | |
1198 | done (ep, req, -ESHUTDOWN); | |
1199 | } | |
1200 | } | |
1201 | ||
1202 | /* dequeue JUST ONE request */ | |
1203 | static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req) | |
1204 | { | |
1205 | struct net2280_ep *ep; | |
1206 | struct net2280_request *req; | |
1207 | unsigned long flags; | |
1208 | u32 dmactl; | |
1209 | int stopped; | |
1210 | ||
1211 | ep = container_of (_ep, struct net2280_ep, ep); | |
1212 | if (!_ep || (!ep->desc && ep->num != 0) || !_req) | |
1213 | return -EINVAL; | |
1214 | ||
1215 | spin_lock_irqsave (&ep->dev->lock, flags); | |
1216 | stopped = ep->stopped; | |
1217 | ||
1218 | /* quiesce dma while we patch the queue */ | |
1219 | dmactl = 0; | |
1220 | ep->stopped = 1; | |
1221 | if (ep->dma) { | |
1222 | dmactl = readl (&ep->dma->dmactl); | |
1223 | /* WARNING erratum 0127 may kick in ... */ | |
1224 | stop_dma (ep->dma); | |
1225 | scan_dma_completions (ep); | |
1226 | } | |
1227 | ||
1228 | /* make sure it's still queued on this endpoint */ | |
1229 | list_for_each_entry (req, &ep->queue, queue) { | |
1230 | if (&req->req == _req) | |
1231 | break; | |
1232 | } | |
1233 | if (&req->req != _req) { | |
1234 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
1235 | return -EINVAL; | |
1236 | } | |
1237 | ||
1238 | /* queue head may be partially complete. */ | |
1239 | if (ep->queue.next == &req->queue) { | |
1240 | if (ep->dma) { | |
1241 | DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name); | |
1242 | _req->status = -ECONNRESET; | |
1243 | abort_dma (ep); | |
1244 | if (likely (ep->queue.next == &req->queue)) { | |
1245 | // NOTE: misreports single-transfer mode | |
1246 | req->td->dmacount = 0; /* invalidate */ | |
1247 | dma_done (ep, req, | |
1248 | readl (&ep->dma->dmacount), | |
1249 | -ECONNRESET); | |
1250 | } | |
1251 | } else { | |
1252 | DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name); | |
1253 | done (ep, req, -ECONNRESET); | |
1254 | } | |
1255 | req = NULL; | |
1256 | ||
1257 | /* patch up hardware chaining data */ | |
1258 | } else if (ep->dma && use_dma_chaining) { | |
1259 | if (req->queue.prev == ep->queue.next) { | |
1260 | writel (le32_to_cpu (req->td->dmadesc), | |
1261 | &ep->dma->dmadesc); | |
1262 | if (req->td->dmacount & dma_done_ie) | |
1263 | writel (readl (&ep->dma->dmacount) | |
320f3459 | 1264 | | le32_to_cpu(dma_done_ie), |
1da177e4 LT |
1265 | &ep->dma->dmacount); |
1266 | } else { | |
1267 | struct net2280_request *prev; | |
1268 | ||
1269 | prev = list_entry (req->queue.prev, | |
1270 | struct net2280_request, queue); | |
1271 | prev->td->dmadesc = req->td->dmadesc; | |
1272 | if (req->td->dmacount & dma_done_ie) | |
1273 | prev->td->dmacount |= dma_done_ie; | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | if (req) | |
1278 | done (ep, req, -ECONNRESET); | |
1279 | ep->stopped = stopped; | |
1280 | ||
1281 | if (ep->dma) { | |
1282 | /* turn off dma on inactive queues */ | |
1283 | if (list_empty (&ep->queue)) | |
1284 | stop_dma (ep->dma); | |
1285 | else if (!ep->stopped) { | |
1286 | /* resume current request, or start new one */ | |
1287 | if (req) | |
1288 | writel (dmactl, &ep->dma->dmactl); | |
1289 | else | |
1290 | start_dma (ep, list_entry (ep->queue.next, | |
1291 | struct net2280_request, queue)); | |
1292 | } | |
1293 | } | |
1294 | ||
1295 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | /*-------------------------------------------------------------------------*/ | |
1300 | ||
1301 | static int net2280_fifo_status (struct usb_ep *_ep); | |
1302 | ||
1303 | static int | |
1304 | net2280_set_halt (struct usb_ep *_ep, int value) | |
1305 | { | |
1306 | struct net2280_ep *ep; | |
1307 | unsigned long flags; | |
1308 | int retval = 0; | |
1309 | ||
1310 | ep = container_of (_ep, struct net2280_ep, ep); | |
1311 | if (!_ep || (!ep->desc && ep->num != 0)) | |
1312 | return -EINVAL; | |
1313 | if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1314 | return -ESHUTDOWN; | |
1315 | if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03) | |
1316 | == USB_ENDPOINT_XFER_ISOC) | |
1317 | return -EINVAL; | |
1318 | ||
1319 | spin_lock_irqsave (&ep->dev->lock, flags); | |
1320 | if (!list_empty (&ep->queue)) | |
1321 | retval = -EAGAIN; | |
1322 | else if (ep->is_in && value && net2280_fifo_status (_ep) != 0) | |
1323 | retval = -EAGAIN; | |
1324 | else { | |
1325 | VDEBUG (ep->dev, "%s %s halt\n", _ep->name, | |
1326 | value ? "set" : "clear"); | |
1327 | /* set/clear, then synch memory views with the device */ | |
1328 | if (value) { | |
1329 | if (ep->num == 0) | |
1330 | ep->dev->protocol_stall = 1; | |
1331 | else | |
1332 | set_halt (ep); | |
1333 | } else | |
1334 | clear_halt (ep); | |
1335 | (void) readl (&ep->regs->ep_rsp); | |
1336 | } | |
1337 | spin_unlock_irqrestore (&ep->dev->lock, flags); | |
1338 | ||
1339 | return retval; | |
1340 | } | |
1341 | ||
1342 | static int | |
1343 | net2280_fifo_status (struct usb_ep *_ep) | |
1344 | { | |
1345 | struct net2280_ep *ep; | |
1346 | u32 avail; | |
1347 | ||
1348 | ep = container_of (_ep, struct net2280_ep, ep); | |
1349 | if (!_ep || (!ep->desc && ep->num != 0)) | |
1350 | return -ENODEV; | |
1351 | if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1352 | return -ESHUTDOWN; | |
1353 | ||
1354 | avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1); | |
1355 | if (avail > ep->fifo_size) | |
1356 | return -EOVERFLOW; | |
1357 | if (ep->is_in) | |
1358 | avail = ep->fifo_size - avail; | |
1359 | return avail; | |
1360 | } | |
1361 | ||
1362 | static void | |
1363 | net2280_fifo_flush (struct usb_ep *_ep) | |
1364 | { | |
1365 | struct net2280_ep *ep; | |
1366 | ||
1367 | ep = container_of (_ep, struct net2280_ep, ep); | |
1368 | if (!_ep || (!ep->desc && ep->num != 0)) | |
1369 | return; | |
1370 | if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1371 | return; | |
1372 | ||
1373 | writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat); | |
1374 | (void) readl (&ep->regs->ep_rsp); | |
1375 | } | |
1376 | ||
1377 | static struct usb_ep_ops net2280_ep_ops = { | |
1378 | .enable = net2280_enable, | |
1379 | .disable = net2280_disable, | |
1380 | ||
1381 | .alloc_request = net2280_alloc_request, | |
1382 | .free_request = net2280_free_request, | |
1383 | ||
1384 | .alloc_buffer = net2280_alloc_buffer, | |
1385 | .free_buffer = net2280_free_buffer, | |
1386 | ||
1387 | .queue = net2280_queue, | |
1388 | .dequeue = net2280_dequeue, | |
1389 | ||
1390 | .set_halt = net2280_set_halt, | |
1391 | .fifo_status = net2280_fifo_status, | |
1392 | .fifo_flush = net2280_fifo_flush, | |
1393 | }; | |
1394 | ||
1395 | /*-------------------------------------------------------------------------*/ | |
1396 | ||
1397 | static int net2280_get_frame (struct usb_gadget *_gadget) | |
1398 | { | |
1399 | struct net2280 *dev; | |
1400 | unsigned long flags; | |
1401 | u16 retval; | |
1402 | ||
1403 | if (!_gadget) | |
1404 | return -ENODEV; | |
1405 | dev = container_of (_gadget, struct net2280, gadget); | |
1406 | spin_lock_irqsave (&dev->lock, flags); | |
1407 | retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff; | |
1408 | spin_unlock_irqrestore (&dev->lock, flags); | |
1409 | return retval; | |
1410 | } | |
1411 | ||
1412 | static int net2280_wakeup (struct usb_gadget *_gadget) | |
1413 | { | |
1414 | struct net2280 *dev; | |
1415 | u32 tmp; | |
1416 | unsigned long flags; | |
1417 | ||
1418 | if (!_gadget) | |
1419 | return 0; | |
1420 | dev = container_of (_gadget, struct net2280, gadget); | |
1421 | ||
1422 | spin_lock_irqsave (&dev->lock, flags); | |
1423 | tmp = readl (&dev->usb->usbctl); | |
1424 | if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE)) | |
1425 | writel (1 << GENERATE_RESUME, &dev->usb->usbstat); | |
1426 | spin_unlock_irqrestore (&dev->lock, flags); | |
1427 | ||
1428 | /* pci writes may still be posted */ | |
1429 | return 0; | |
1430 | } | |
1431 | ||
1432 | static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value) | |
1433 | { | |
1434 | struct net2280 *dev; | |
1435 | u32 tmp; | |
1436 | unsigned long flags; | |
1437 | ||
1438 | if (!_gadget) | |
1439 | return 0; | |
1440 | dev = container_of (_gadget, struct net2280, gadget); | |
1441 | ||
1442 | spin_lock_irqsave (&dev->lock, flags); | |
1443 | tmp = readl (&dev->usb->usbctl); | |
1444 | if (value) | |
1445 | tmp |= (1 << SELF_POWERED_STATUS); | |
1446 | else | |
1447 | tmp &= ~(1 << SELF_POWERED_STATUS); | |
1448 | writel (tmp, &dev->usb->usbctl); | |
1449 | spin_unlock_irqrestore (&dev->lock, flags); | |
1450 | ||
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | static int net2280_pullup(struct usb_gadget *_gadget, int is_on) | |
1455 | { | |
1456 | struct net2280 *dev; | |
1457 | u32 tmp; | |
1458 | unsigned long flags; | |
1459 | ||
1460 | if (!_gadget) | |
1461 | return -ENODEV; | |
1462 | dev = container_of (_gadget, struct net2280, gadget); | |
1463 | ||
1464 | spin_lock_irqsave (&dev->lock, flags); | |
1465 | tmp = readl (&dev->usb->usbctl); | |
1466 | dev->softconnect = (is_on != 0); | |
1467 | if (is_on) | |
1468 | tmp |= (1 << USB_DETECT_ENABLE); | |
1469 | else | |
1470 | tmp &= ~(1 << USB_DETECT_ENABLE); | |
1471 | writel (tmp, &dev->usb->usbctl); | |
1472 | spin_unlock_irqrestore (&dev->lock, flags); | |
1473 | ||
1474 | return 0; | |
1475 | } | |
1476 | ||
1477 | static const struct usb_gadget_ops net2280_ops = { | |
1478 | .get_frame = net2280_get_frame, | |
1479 | .wakeup = net2280_wakeup, | |
1480 | .set_selfpowered = net2280_set_selfpowered, | |
1481 | .pullup = net2280_pullup, | |
1482 | }; | |
1483 | ||
1484 | /*-------------------------------------------------------------------------*/ | |
1485 | ||
1486 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES | |
1487 | ||
1488 | /* FIXME move these into procfs, and use seq_file. | |
1489 | * Sysfs _still_ doesn't behave for arbitrarily sized files, | |
1490 | * and also doesn't help products using this with 2.4 kernels. | |
1491 | */ | |
1492 | ||
1493 | /* "function" sysfs attribute */ | |
1494 | static ssize_t | |
10523b3b | 1495 | show_function (struct device *_dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
1496 | { |
1497 | struct net2280 *dev = dev_get_drvdata (_dev); | |
1498 | ||
1499 | if (!dev->driver | |
1500 | || !dev->driver->function | |
1501 | || strlen (dev->driver->function) > PAGE_SIZE) | |
1502 | return 0; | |
1503 | return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function); | |
1504 | } | |
1505 | static DEVICE_ATTR (function, S_IRUGO, show_function, NULL); | |
1506 | ||
1507 | static ssize_t | |
10523b3b | 1508 | show_registers (struct device *_dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
1509 | { |
1510 | struct net2280 *dev; | |
1511 | char *next; | |
1512 | unsigned size, t; | |
1513 | unsigned long flags; | |
1514 | int i; | |
1515 | u32 t1, t2; | |
30e69598 | 1516 | const char *s; |
1da177e4 LT |
1517 | |
1518 | dev = dev_get_drvdata (_dev); | |
1519 | next = buf; | |
1520 | size = PAGE_SIZE; | |
1521 | spin_lock_irqsave (&dev->lock, flags); | |
1522 | ||
1523 | if (dev->driver) | |
1524 | s = dev->driver->driver.name; | |
1525 | else | |
1526 | s = "(none)"; | |
1527 | ||
1528 | /* Main Control Registers */ | |
1529 | t = scnprintf (next, size, "%s version " DRIVER_VERSION | |
1530 | ", chiprev %04x, dma %s\n\n" | |
1531 | "devinit %03x fifoctl %08x gadget '%s'\n" | |
1532 | "pci irqenb0 %02x irqenb1 %08x " | |
1533 | "irqstat0 %04x irqstat1 %08x\n", | |
1534 | driver_name, dev->chiprev, | |
1535 | use_dma | |
1536 | ? (use_dma_chaining ? "chaining" : "enabled") | |
1537 | : "disabled", | |
1538 | readl (&dev->regs->devinit), | |
1539 | readl (&dev->regs->fifoctl), | |
1540 | s, | |
1541 | readl (&dev->regs->pciirqenb0), | |
1542 | readl (&dev->regs->pciirqenb1), | |
1543 | readl (&dev->regs->irqstat0), | |
1544 | readl (&dev->regs->irqstat1)); | |
1545 | size -= t; | |
1546 | next += t; | |
1547 | ||
1548 | /* USB Control Registers */ | |
1549 | t1 = readl (&dev->usb->usbctl); | |
1550 | t2 = readl (&dev->usb->usbstat); | |
1551 | if (t1 & (1 << VBUS_PIN)) { | |
1552 | if (t2 & (1 << HIGH_SPEED)) | |
1553 | s = "high speed"; | |
1554 | else if (dev->gadget.speed == USB_SPEED_UNKNOWN) | |
1555 | s = "powered"; | |
1556 | else | |
1557 | s = "full speed"; | |
1558 | /* full speed bit (6) not working?? */ | |
1559 | } else | |
1560 | s = "not attached"; | |
1561 | t = scnprintf (next, size, | |
1562 | "stdrsp %08x usbctl %08x usbstat %08x " | |
1563 | "addr 0x%02x (%s)\n", | |
1564 | readl (&dev->usb->stdrsp), t1, t2, | |
1565 | readl (&dev->usb->ouraddr), s); | |
1566 | size -= t; | |
1567 | next += t; | |
1568 | ||
1569 | /* PCI Master Control Registers */ | |
1570 | ||
1571 | /* DMA Control Registers */ | |
1572 | ||
1573 | /* Configurable EP Control Registers */ | |
1574 | for (i = 0; i < 7; i++) { | |
1575 | struct net2280_ep *ep; | |
1576 | ||
1577 | ep = &dev->ep [i]; | |
1578 | if (i && !ep->desc) | |
1579 | continue; | |
1580 | ||
1581 | t1 = readl (&ep->regs->ep_cfg); | |
1582 | t2 = readl (&ep->regs->ep_rsp) & 0xff; | |
1583 | t = scnprintf (next, size, | |
1584 | "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s" | |
1585 | "irqenb %02x\n", | |
1586 | ep->ep.name, t1, t2, | |
1587 | (t2 & (1 << CLEAR_NAK_OUT_PACKETS)) | |
1588 | ? "NAK " : "", | |
1589 | (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE)) | |
1590 | ? "hide " : "", | |
1591 | (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR)) | |
1592 | ? "CRC " : "", | |
1593 | (t2 & (1 << CLEAR_INTERRUPT_MODE)) | |
1594 | ? "interrupt " : "", | |
1595 | (t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)) | |
1596 | ? "status " : "", | |
1597 | (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE)) | |
1598 | ? "NAKmode " : "", | |
1599 | (t2 & (1 << CLEAR_ENDPOINT_TOGGLE)) | |
1600 | ? "DATA1 " : "DATA0 ", | |
1601 | (t2 & (1 << CLEAR_ENDPOINT_HALT)) | |
1602 | ? "HALT " : "", | |
1603 | readl (&ep->regs->ep_irqenb)); | |
1604 | size -= t; | |
1605 | next += t; | |
1606 | ||
1607 | t = scnprintf (next, size, | |
1608 | "\tstat %08x avail %04x " | |
1609 | "(ep%d%s-%s)%s\n", | |
1610 | readl (&ep->regs->ep_stat), | |
1611 | readl (&ep->regs->ep_avail), | |
1612 | t1 & 0x0f, DIR_STRING (t1), | |
1613 | type_string (t1 >> 8), | |
1614 | ep->stopped ? "*" : ""); | |
1615 | size -= t; | |
1616 | next += t; | |
1617 | ||
1618 | if (!ep->dma) | |
1619 | continue; | |
1620 | ||
1621 | t = scnprintf (next, size, | |
1622 | " dma\tctl %08x stat %08x count %08x\n" | |
1623 | "\taddr %08x desc %08x\n", | |
1624 | readl (&ep->dma->dmactl), | |
1625 | readl (&ep->dma->dmastat), | |
1626 | readl (&ep->dma->dmacount), | |
1627 | readl (&ep->dma->dmaaddr), | |
1628 | readl (&ep->dma->dmadesc)); | |
1629 | size -= t; | |
1630 | next += t; | |
1631 | ||
1632 | } | |
1633 | ||
1634 | /* Indexed Registers */ | |
1635 | // none yet | |
1636 | ||
1637 | /* Statistics */ | |
1638 | t = scnprintf (next, size, "\nirqs: "); | |
1639 | size -= t; | |
1640 | next += t; | |
1641 | for (i = 0; i < 7; i++) { | |
1642 | struct net2280_ep *ep; | |
1643 | ||
1644 | ep = &dev->ep [i]; | |
1645 | if (i && !ep->irqs) | |
1646 | continue; | |
1647 | t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs); | |
1648 | size -= t; | |
1649 | next += t; | |
1650 | ||
1651 | } | |
1652 | t = scnprintf (next, size, "\n"); | |
1653 | size -= t; | |
1654 | next += t; | |
1655 | ||
1656 | spin_unlock_irqrestore (&dev->lock, flags); | |
1657 | ||
1658 | return PAGE_SIZE - size; | |
1659 | } | |
1660 | static DEVICE_ATTR (registers, S_IRUGO, show_registers, NULL); | |
1661 | ||
1662 | static ssize_t | |
10523b3b | 1663 | show_queues (struct device *_dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
1664 | { |
1665 | struct net2280 *dev; | |
1666 | char *next; | |
1667 | unsigned size; | |
1668 | unsigned long flags; | |
1669 | int i; | |
1670 | ||
1671 | dev = dev_get_drvdata (_dev); | |
1672 | next = buf; | |
1673 | size = PAGE_SIZE; | |
1674 | spin_lock_irqsave (&dev->lock, flags); | |
1675 | ||
1676 | for (i = 0; i < 7; i++) { | |
1677 | struct net2280_ep *ep = &dev->ep [i]; | |
1678 | struct net2280_request *req; | |
1679 | int t; | |
1680 | ||
1681 | if (i != 0) { | |
1682 | const struct usb_endpoint_descriptor *d; | |
1683 | ||
1684 | d = ep->desc; | |
1685 | if (!d) | |
1686 | continue; | |
1687 | t = d->bEndpointAddress; | |
1688 | t = scnprintf (next, size, | |
1689 | "\n%s (ep%d%s-%s) max %04x %s fifo %d\n", | |
1690 | ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK, | |
1691 | (t & USB_DIR_IN) ? "in" : "out", | |
1692 | ({ char *val; | |
1693 | switch (d->bmAttributes & 0x03) { | |
1694 | case USB_ENDPOINT_XFER_BULK: | |
1695 | val = "bulk"; break; | |
1696 | case USB_ENDPOINT_XFER_INT: | |
1697 | val = "intr"; break; | |
1698 | default: | |
1699 | val = "iso"; break; | |
1700 | }; val; }), | |
1701 | le16_to_cpu (d->wMaxPacketSize) & 0x1fff, | |
1702 | ep->dma ? "dma" : "pio", ep->fifo_size | |
1703 | ); | |
1704 | } else /* ep0 should only have one transfer queued */ | |
1705 | t = scnprintf (next, size, "ep0 max 64 pio %s\n", | |
1706 | ep->is_in ? "in" : "out"); | |
1707 | if (t <= 0 || t > size) | |
1708 | goto done; | |
1709 | size -= t; | |
1710 | next += t; | |
1711 | ||
1712 | if (list_empty (&ep->queue)) { | |
1713 | t = scnprintf (next, size, "\t(nothing queued)\n"); | |
1714 | if (t <= 0 || t > size) | |
1715 | goto done; | |
1716 | size -= t; | |
1717 | next += t; | |
1718 | continue; | |
1719 | } | |
1720 | list_for_each_entry (req, &ep->queue, queue) { | |
1721 | if (ep->dma && req->td_dma == readl (&ep->dma->dmadesc)) | |
1722 | t = scnprintf (next, size, | |
1723 | "\treq %p len %d/%d " | |
1724 | "buf %p (dmacount %08x)\n", | |
1725 | &req->req, req->req.actual, | |
1726 | req->req.length, req->req.buf, | |
1727 | readl (&ep->dma->dmacount)); | |
1728 | else | |
1729 | t = scnprintf (next, size, | |
1730 | "\treq %p len %d/%d buf %p\n", | |
1731 | &req->req, req->req.actual, | |
1732 | req->req.length, req->req.buf); | |
1733 | if (t <= 0 || t > size) | |
1734 | goto done; | |
1735 | size -= t; | |
1736 | next += t; | |
1737 | ||
1738 | if (ep->dma) { | |
1739 | struct net2280_dma *td; | |
1740 | ||
1741 | td = req->td; | |
1742 | t = scnprintf (next, size, "\t td %08x " | |
1743 | " count %08x buf %08x desc %08x\n", | |
1744 | (u32) req->td_dma, | |
1745 | le32_to_cpu (td->dmacount), | |
1746 | le32_to_cpu (td->dmaaddr), | |
1747 | le32_to_cpu (td->dmadesc)); | |
1748 | if (t <= 0 || t > size) | |
1749 | goto done; | |
1750 | size -= t; | |
1751 | next += t; | |
1752 | } | |
1753 | } | |
1754 | } | |
1755 | ||
1756 | done: | |
1757 | spin_unlock_irqrestore (&dev->lock, flags); | |
1758 | return PAGE_SIZE - size; | |
1759 | } | |
1760 | static DEVICE_ATTR (queues, S_IRUGO, show_queues, NULL); | |
1761 | ||
1762 | ||
1763 | #else | |
1764 | ||
1765 | #define device_create_file(a,b) do {} while (0) | |
1766 | #define device_remove_file device_create_file | |
1767 | ||
1768 | #endif | |
1769 | ||
1770 | /*-------------------------------------------------------------------------*/ | |
1771 | ||
1772 | /* another driver-specific mode might be a request type doing dma | |
1773 | * to/from another device fifo instead of to/from memory. | |
1774 | */ | |
1775 | ||
1776 | static void set_fifo_mode (struct net2280 *dev, int mode) | |
1777 | { | |
1778 | /* keeping high bits preserves BAR2 */ | |
1779 | writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl); | |
1780 | ||
1781 | /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */ | |
1782 | INIT_LIST_HEAD (&dev->gadget.ep_list); | |
1783 | list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list); | |
1784 | list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list); | |
1785 | switch (mode) { | |
1786 | case 0: | |
1787 | list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list); | |
1788 | list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list); | |
1789 | dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024; | |
1790 | break; | |
1791 | case 1: | |
1792 | dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048; | |
1793 | break; | |
1794 | case 2: | |
1795 | list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list); | |
1796 | dev->ep [1].fifo_size = 2048; | |
1797 | dev->ep [2].fifo_size = 1024; | |
1798 | break; | |
1799 | } | |
1800 | /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */ | |
1801 | list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list); | |
1802 | list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list); | |
1803 | } | |
1804 | ||
320f3459 DB |
1805 | /* just declare this in any driver that really need it */ |
1806 | extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode); | |
1807 | ||
1da177e4 LT |
1808 | /** |
1809 | * net2280_set_fifo_mode - change allocation of fifo buffers | |
1810 | * @gadget: access to the net2280 device that will be updated | |
1811 | * @mode: 0 for default, four 1kB buffers (ep-a through ep-d); | |
1812 | * 1 for two 2kB buffers (ep-a and ep-b only); | |
1813 | * 2 for one 2kB buffer (ep-a) and two 1kB ones (ep-b, ep-c). | |
1814 | * | |
1815 | * returns zero on success, else negative errno. when this succeeds, | |
1816 | * the contents of gadget->ep_list may have changed. | |
1817 | * | |
1818 | * you may only call this function when endpoints a-d are all disabled. | |
1819 | * use it whenever extra hardware buffering can help performance, such | |
1820 | * as before enabling "high bandwidth" interrupt endpoints that use | |
1821 | * maxpacket bigger than 512 (when double buffering would otherwise | |
1822 | * be unavailable). | |
1823 | */ | |
1824 | int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode) | |
1825 | { | |
1826 | int i; | |
1827 | struct net2280 *dev; | |
1828 | int status = 0; | |
1829 | unsigned long flags; | |
1830 | ||
1831 | if (!gadget) | |
1832 | return -ENODEV; | |
1833 | dev = container_of (gadget, struct net2280, gadget); | |
1834 | ||
1835 | spin_lock_irqsave (&dev->lock, flags); | |
1836 | ||
1837 | for (i = 1; i <= 4; i++) | |
1838 | if (dev->ep [i].desc) { | |
1839 | status = -EINVAL; | |
1840 | break; | |
1841 | } | |
1842 | if (mode < 0 || mode > 2) | |
1843 | status = -EINVAL; | |
1844 | if (status == 0) | |
1845 | set_fifo_mode (dev, mode); | |
1846 | spin_unlock_irqrestore (&dev->lock, flags); | |
1847 | ||
1848 | if (status == 0) { | |
1849 | if (mode == 1) | |
1850 | DEBUG (dev, "fifo: ep-a 2K, ep-b 2K\n"); | |
1851 | else if (mode == 2) | |
1852 | DEBUG (dev, "fifo: ep-a 2K, ep-b 1K, ep-c 1K\n"); | |
1853 | /* else all are 1K */ | |
1854 | } | |
1855 | return status; | |
1856 | } | |
1857 | EXPORT_SYMBOL (net2280_set_fifo_mode); | |
1858 | ||
1859 | /*-------------------------------------------------------------------------*/ | |
1860 | ||
1861 | /* keeping it simple: | |
1862 | * - one bus driver, initted first; | |
1863 | * - one function driver, initted second | |
1864 | * | |
1865 | * most of the work to support multiple net2280 controllers would | |
1866 | * be to associate this gadget driver (yes?) with all of them, or | |
1867 | * perhaps to bind specific drivers to specific devices. | |
1868 | */ | |
1869 | ||
1870 | static struct net2280 *the_controller; | |
1871 | ||
1872 | static void usb_reset (struct net2280 *dev) | |
1873 | { | |
1874 | u32 tmp; | |
1875 | ||
1876 | dev->gadget.speed = USB_SPEED_UNKNOWN; | |
1877 | (void) readl (&dev->usb->usbctl); | |
1878 | ||
1879 | net2280_led_init (dev); | |
1880 | ||
1881 | /* disable automatic responses, and irqs */ | |
1882 | writel (0, &dev->usb->stdrsp); | |
1883 | writel (0, &dev->regs->pciirqenb0); | |
1884 | writel (0, &dev->regs->pciirqenb1); | |
1885 | ||
1886 | /* clear old dma and irq state */ | |
1887 | for (tmp = 0; tmp < 4; tmp++) { | |
1888 | struct net2280_ep *ep = &dev->ep [tmp + 1]; | |
1889 | ||
1890 | if (ep->dma) | |
1891 | abort_dma (ep); | |
1892 | } | |
1893 | writel (~0, &dev->regs->irqstat0), | |
1894 | writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1), | |
1895 | ||
1896 | /* reset, and enable pci */ | |
1897 | tmp = readl (&dev->regs->devinit) | |
1898 | | (1 << PCI_ENABLE) | |
1899 | | (1 << FIFO_SOFT_RESET) | |
1900 | | (1 << USB_SOFT_RESET) | |
1901 | | (1 << M8051_RESET); | |
1902 | writel (tmp, &dev->regs->devinit); | |
1903 | ||
1904 | /* standard fifo and endpoint allocations */ | |
1905 | set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0); | |
1906 | } | |
1907 | ||
1908 | static void usb_reinit (struct net2280 *dev) | |
1909 | { | |
1910 | u32 tmp; | |
1911 | int init_dma; | |
1912 | ||
1913 | /* use_dma changes are ignored till next device re-init */ | |
1914 | init_dma = use_dma; | |
1915 | ||
1916 | /* basic endpoint init */ | |
1917 | for (tmp = 0; tmp < 7; tmp++) { | |
1918 | struct net2280_ep *ep = &dev->ep [tmp]; | |
1919 | ||
1920 | ep->ep.name = ep_name [tmp]; | |
1921 | ep->dev = dev; | |
1922 | ep->num = tmp; | |
1923 | ||
1924 | if (tmp > 0 && tmp <= 4) { | |
1925 | ep->fifo_size = 1024; | |
1926 | if (init_dma) | |
1927 | ep->dma = &dev->dma [tmp - 1]; | |
1928 | } else | |
1929 | ep->fifo_size = 64; | |
1930 | ep->regs = &dev->epregs [tmp]; | |
1931 | ep_reset (dev->regs, ep); | |
1932 | } | |
1933 | dev->ep [0].ep.maxpacket = 64; | |
1934 | dev->ep [5].ep.maxpacket = 64; | |
1935 | dev->ep [6].ep.maxpacket = 64; | |
1936 | ||
1937 | dev->gadget.ep0 = &dev->ep [0].ep; | |
1938 | dev->ep [0].stopped = 0; | |
1939 | INIT_LIST_HEAD (&dev->gadget.ep0->ep_list); | |
1940 | ||
1941 | /* we want to prevent lowlevel/insecure access from the USB host, | |
1942 | * but erratum 0119 means this enable bit is ignored | |
1943 | */ | |
1944 | for (tmp = 0; tmp < 5; tmp++) | |
1945 | writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg); | |
1946 | } | |
1947 | ||
1948 | static void ep0_start (struct net2280 *dev) | |
1949 | { | |
1950 | writel ( (1 << CLEAR_EP_HIDE_STATUS_PHASE) | |
1951 | | (1 << CLEAR_NAK_OUT_PACKETS) | |
1952 | | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) | |
1953 | , &dev->epregs [0].ep_rsp); | |
1954 | ||
1955 | /* | |
1956 | * hardware optionally handles a bunch of standard requests | |
1957 | * that the API hides from drivers anyway. have it do so. | |
1958 | * endpoint status/features are handled in software, to | |
1959 | * help pass tests for some dubious behavior. | |
1960 | */ | |
1961 | writel ( (1 << SET_TEST_MODE) | |
1962 | | (1 << SET_ADDRESS) | |
1963 | | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) | |
1964 | | (1 << GET_DEVICE_STATUS) | |
1965 | | (1 << GET_INTERFACE_STATUS) | |
1966 | , &dev->usb->stdrsp); | |
1967 | writel ( (1 << USB_ROOT_PORT_WAKEUP_ENABLE) | |
1968 | | (1 << SELF_POWERED_USB_DEVICE) | |
1969 | | (1 << REMOTE_WAKEUP_SUPPORT) | |
1970 | | (dev->softconnect << USB_DETECT_ENABLE) | |
1971 | | (1 << SELF_POWERED_STATUS) | |
1972 | , &dev->usb->usbctl); | |
1973 | ||
1974 | /* enable irqs so we can see ep0 and general operation */ | |
1975 | writel ( (1 << SETUP_PACKET_INTERRUPT_ENABLE) | |
1976 | | (1 << ENDPOINT_0_INTERRUPT_ENABLE) | |
1977 | , &dev->regs->pciirqenb0); | |
1978 | writel ( (1 << PCI_INTERRUPT_ENABLE) | |
1979 | | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) | |
1980 | | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) | |
1981 | | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE) | |
1982 | | (1 << VBUS_INTERRUPT_ENABLE) | |
1983 | | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE) | |
1984 | | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) | |
1985 | , &dev->regs->pciirqenb1); | |
1986 | ||
1987 | /* don't leave any writes posted */ | |
1988 | (void) readl (&dev->usb->usbctl); | |
1989 | } | |
1990 | ||
1991 | /* when a driver is successfully registered, it will receive | |
1992 | * control requests including set_configuration(), which enables | |
1993 | * non-control requests. then usb traffic follows until a | |
1994 | * disconnect is reported. then a host may connect again, or | |
1995 | * the driver might get unbound. | |
1996 | */ | |
1997 | int usb_gadget_register_driver (struct usb_gadget_driver *driver) | |
1998 | { | |
1999 | struct net2280 *dev = the_controller; | |
2000 | int retval; | |
2001 | unsigned i; | |
2002 | ||
2003 | /* insist on high speed support from the driver, since | |
2004 | * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE) | |
2005 | * "must not be used in normal operation" | |
2006 | */ | |
2007 | if (!driver | |
2008 | || driver->speed != USB_SPEED_HIGH | |
2009 | || !driver->bind | |
2010 | || !driver->unbind | |
2011 | || !driver->setup) | |
2012 | return -EINVAL; | |
2013 | if (!dev) | |
2014 | return -ENODEV; | |
2015 | if (dev->driver) | |
2016 | return -EBUSY; | |
2017 | ||
2018 | for (i = 0; i < 7; i++) | |
2019 | dev->ep [i].irqs = 0; | |
2020 | ||
2021 | /* hook up the driver ... */ | |
2022 | dev->softconnect = 1; | |
2023 | driver->driver.bus = NULL; | |
2024 | dev->driver = driver; | |
2025 | dev->gadget.dev.driver = &driver->driver; | |
2026 | retval = driver->bind (&dev->gadget); | |
2027 | if (retval) { | |
2028 | DEBUG (dev, "bind to driver %s --> %d\n", | |
2029 | driver->driver.name, retval); | |
2030 | dev->driver = NULL; | |
2031 | dev->gadget.dev.driver = NULL; | |
2032 | return retval; | |
2033 | } | |
2034 | ||
2035 | device_create_file (&dev->pdev->dev, &dev_attr_function); | |
2036 | device_create_file (&dev->pdev->dev, &dev_attr_queues); | |
2037 | ||
2038 | /* ... then enable host detection and ep0; and we're ready | |
2039 | * for set_configuration as well as eventual disconnect. | |
2040 | */ | |
2041 | net2280_led_active (dev, 1); | |
2042 | ep0_start (dev); | |
2043 | ||
2044 | DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n", | |
2045 | driver->driver.name, | |
2046 | readl (&dev->usb->usbctl), | |
2047 | readl (&dev->usb->stdrsp)); | |
2048 | ||
2049 | /* pci writes may still be posted */ | |
2050 | return 0; | |
2051 | } | |
2052 | EXPORT_SYMBOL (usb_gadget_register_driver); | |
2053 | ||
2054 | static void | |
2055 | stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver) | |
2056 | { | |
2057 | int i; | |
2058 | ||
2059 | /* don't disconnect if it's not connected */ | |
2060 | if (dev->gadget.speed == USB_SPEED_UNKNOWN) | |
2061 | driver = NULL; | |
2062 | ||
2063 | /* stop hardware; prevent new request submissions; | |
2064 | * and kill any outstanding requests. | |
2065 | */ | |
2066 | usb_reset (dev); | |
2067 | for (i = 0; i < 7; i++) | |
2068 | nuke (&dev->ep [i]); | |
2069 | ||
2070 | /* report disconnect; the driver is already quiesced */ | |
2071 | if (driver) { | |
2072 | spin_unlock (&dev->lock); | |
2073 | driver->disconnect (&dev->gadget); | |
2074 | spin_lock (&dev->lock); | |
2075 | } | |
2076 | ||
2077 | usb_reinit (dev); | |
2078 | } | |
2079 | ||
2080 | int usb_gadget_unregister_driver (struct usb_gadget_driver *driver) | |
2081 | { | |
2082 | struct net2280 *dev = the_controller; | |
2083 | unsigned long flags; | |
2084 | ||
2085 | if (!dev) | |
2086 | return -ENODEV; | |
2087 | if (!driver || driver != dev->driver) | |
2088 | return -EINVAL; | |
2089 | ||
2090 | spin_lock_irqsave (&dev->lock, flags); | |
2091 | stop_activity (dev, driver); | |
2092 | spin_unlock_irqrestore (&dev->lock, flags); | |
2093 | ||
2094 | net2280_pullup (&dev->gadget, 0); | |
2095 | ||
2096 | driver->unbind (&dev->gadget); | |
2097 | dev->gadget.dev.driver = NULL; | |
2098 | dev->driver = NULL; | |
2099 | ||
2100 | net2280_led_active (dev, 0); | |
2101 | device_remove_file (&dev->pdev->dev, &dev_attr_function); | |
2102 | device_remove_file (&dev->pdev->dev, &dev_attr_queues); | |
2103 | ||
2104 | DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name); | |
2105 | return 0; | |
2106 | } | |
2107 | EXPORT_SYMBOL (usb_gadget_unregister_driver); | |
2108 | ||
2109 | ||
2110 | /*-------------------------------------------------------------------------*/ | |
2111 | ||
2112 | /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq. | |
2113 | * also works for dma-capable endpoints, in pio mode or just | |
2114 | * to manually advance the queue after short OUT transfers. | |
2115 | */ | |
2116 | static void handle_ep_small (struct net2280_ep *ep) | |
2117 | { | |
2118 | struct net2280_request *req; | |
2119 | u32 t; | |
2120 | /* 0 error, 1 mid-data, 2 done */ | |
2121 | int mode = 1; | |
2122 | ||
2123 | if (!list_empty (&ep->queue)) | |
2124 | req = list_entry (ep->queue.next, | |
2125 | struct net2280_request, queue); | |
2126 | else | |
2127 | req = NULL; | |
2128 | ||
2129 | /* ack all, and handle what we care about */ | |
2130 | t = readl (&ep->regs->ep_stat); | |
2131 | ep->irqs++; | |
2132 | #if 0 | |
2133 | VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n", | |
2134 | ep->ep.name, t, req ? &req->req : 0); | |
2135 | #endif | |
950ee4c8 GL |
2136 | if (!ep->is_in || ep->dev->pdev->device == 0x2280) |
2137 | writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat); | |
2138 | else | |
2139 | /* Added for 2282 */ | |
2140 | writel (t, &ep->regs->ep_stat); | |
1da177e4 LT |
2141 | |
2142 | /* for ep0, monitor token irqs to catch data stage length errors | |
2143 | * and to synchronize on status. | |
2144 | * | |
2145 | * also, to defer reporting of protocol stalls ... here's where | |
2146 | * data or status first appears, handling stalls here should never | |
2147 | * cause trouble on the host side.. | |
2148 | * | |
2149 | * control requests could be slightly faster without token synch for | |
2150 | * status, but status can jam up that way. | |
2151 | */ | |
2152 | if (unlikely (ep->num == 0)) { | |
2153 | if (ep->is_in) { | |
2154 | /* status; stop NAKing */ | |
2155 | if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) { | |
2156 | if (ep->dev->protocol_stall) { | |
2157 | ep->stopped = 1; | |
2158 | set_halt (ep); | |
2159 | } | |
2160 | if (!req) | |
2161 | allow_status (ep); | |
2162 | mode = 2; | |
2163 | /* reply to extra IN data tokens with a zlp */ | |
2164 | } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) { | |
2165 | if (ep->dev->protocol_stall) { | |
2166 | ep->stopped = 1; | |
2167 | set_halt (ep); | |
2168 | mode = 2; | |
a29fccd7 | 2169 | } else if (!req && !ep->stopped) |
1da177e4 LT |
2170 | write_fifo (ep, NULL); |
2171 | } | |
2172 | } else { | |
2173 | /* status; stop NAKing */ | |
2174 | if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) { | |
2175 | if (ep->dev->protocol_stall) { | |
2176 | ep->stopped = 1; | |
2177 | set_halt (ep); | |
2178 | } | |
2179 | mode = 2; | |
2180 | /* an extra OUT token is an error */ | |
2181 | } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) | |
2182 | && req | |
2183 | && req->req.actual == req->req.length) | |
2184 | || !req) { | |
2185 | ep->dev->protocol_stall = 1; | |
2186 | set_halt (ep); | |
2187 | ep->stopped = 1; | |
2188 | if (req) | |
2189 | done (ep, req, -EOVERFLOW); | |
2190 | req = NULL; | |
2191 | } | |
2192 | } | |
2193 | } | |
2194 | ||
2195 | if (unlikely (!req)) | |
2196 | return; | |
2197 | ||
2198 | /* manual DMA queue advance after short OUT */ | |
2199 | if (likely (ep->dma != 0)) { | |
2200 | if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) { | |
2201 | u32 count; | |
2202 | int stopped = ep->stopped; | |
2203 | ||
2204 | /* TRANSFERRED works around OUT_DONE erratum 0112. | |
2205 | * we expect (N <= maxpacket) bytes; host wrote M. | |
2206 | * iff (M < N) we won't ever see a DMA interrupt. | |
2207 | */ | |
2208 | ep->stopped = 1; | |
2209 | for (count = 0; ; t = readl (&ep->regs->ep_stat)) { | |
2210 | ||
2211 | /* any preceding dma transfers must finish. | |
2212 | * dma handles (M >= N), may empty the queue | |
2213 | */ | |
2214 | scan_dma_completions (ep); | |
2215 | if (unlikely (list_empty (&ep->queue) | |
2216 | || ep->out_overflow)) { | |
2217 | req = NULL; | |
2218 | break; | |
2219 | } | |
2220 | req = list_entry (ep->queue.next, | |
2221 | struct net2280_request, queue); | |
2222 | ||
2223 | /* here either (M < N), a "real" short rx; | |
2224 | * or (M == N) and the queue didn't empty | |
2225 | */ | |
2226 | if (likely (t & (1 << FIFO_EMPTY))) { | |
2227 | count = readl (&ep->dma->dmacount); | |
2228 | count &= DMA_BYTE_COUNT_MASK; | |
2229 | if (readl (&ep->dma->dmadesc) | |
2230 | != req->td_dma) | |
2231 | req = NULL; | |
2232 | break; | |
2233 | } | |
2234 | udelay(1); | |
2235 | } | |
2236 | ||
2237 | /* stop DMA, leave ep NAKing */ | |
2238 | writel ((1 << DMA_ABORT), &ep->dma->dmastat); | |
2239 | spin_stop_dma (ep->dma); | |
2240 | ||
2241 | if (likely (req)) { | |
2242 | req->td->dmacount = 0; | |
2243 | t = readl (&ep->regs->ep_avail); | |
68dcc688 DB |
2244 | dma_done (ep, req, count, |
2245 | (ep->out_overflow || t) ? -EOVERFLOW : 0); | |
1da177e4 LT |
2246 | } |
2247 | ||
2248 | /* also flush to prevent erratum 0106 trouble */ | |
2249 | if (unlikely (ep->out_overflow | |
2250 | || (ep->dev->chiprev == 0x0100 | |
2251 | && ep->dev->gadget.speed | |
2252 | == USB_SPEED_FULL))) { | |
2253 | out_flush (ep); | |
2254 | ep->out_overflow = 0; | |
2255 | } | |
2256 | ||
2257 | /* (re)start dma if needed, stop NAKing */ | |
2258 | ep->stopped = stopped; | |
2259 | if (!list_empty (&ep->queue)) | |
2260 | restart_dma (ep); | |
2261 | } else | |
2262 | DEBUG (ep->dev, "%s dma ep_stat %08x ??\n", | |
2263 | ep->ep.name, t); | |
2264 | return; | |
2265 | ||
2266 | /* data packet(s) received (in the fifo, OUT) */ | |
2267 | } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) { | |
2268 | if (read_fifo (ep, req) && ep->num != 0) | |
2269 | mode = 2; | |
2270 | ||
2271 | /* data packet(s) transmitted (IN) */ | |
2272 | } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) { | |
2273 | unsigned len; | |
2274 | ||
2275 | len = req->req.length - req->req.actual; | |
2276 | if (len > ep->ep.maxpacket) | |
2277 | len = ep->ep.maxpacket; | |
2278 | req->req.actual += len; | |
2279 | ||
2280 | /* if we wrote it all, we're usually done */ | |
2281 | if (req->req.actual == req->req.length) { | |
2282 | if (ep->num == 0) { | |
2283 | /* wait for control status */ | |
2284 | if (mode != 2) | |
2285 | req = NULL; | |
2286 | } else if (!req->req.zero || len != ep->ep.maxpacket) | |
2287 | mode = 2; | |
2288 | } | |
2289 | ||
2290 | /* there was nothing to do ... */ | |
2291 | } else if (mode == 1) | |
2292 | return; | |
2293 | ||
2294 | /* done */ | |
2295 | if (mode == 2) { | |
2296 | /* stream endpoints often resubmit/unlink in completion */ | |
2297 | done (ep, req, 0); | |
2298 | ||
2299 | /* maybe advance queue to next request */ | |
2300 | if (ep->num == 0) { | |
2301 | /* NOTE: net2280 could let gadget driver start the | |
2302 | * status stage later. since not all controllers let | |
2303 | * them control that, the api doesn't (yet) allow it. | |
2304 | */ | |
2305 | if (!ep->stopped) | |
2306 | allow_status (ep); | |
2307 | req = NULL; | |
2308 | } else { | |
2309 | if (!list_empty (&ep->queue) && !ep->stopped) | |
2310 | req = list_entry (ep->queue.next, | |
2311 | struct net2280_request, queue); | |
2312 | else | |
2313 | req = NULL; | |
2314 | if (req && !ep->is_in) | |
2315 | stop_out_naking (ep); | |
2316 | } | |
2317 | } | |
2318 | ||
2319 | /* is there a buffer for the next packet? | |
2320 | * for best streaming performance, make sure there is one. | |
2321 | */ | |
2322 | if (req && !ep->stopped) { | |
2323 | ||
2324 | /* load IN fifo with next packet (may be zlp) */ | |
2325 | if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) | |
2326 | write_fifo (ep, &req->req); | |
2327 | } | |
2328 | } | |
2329 | ||
2330 | static struct net2280_ep * | |
2331 | get_ep_by_addr (struct net2280 *dev, u16 wIndex) | |
2332 | { | |
2333 | struct net2280_ep *ep; | |
2334 | ||
2335 | if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0) | |
2336 | return &dev->ep [0]; | |
2337 | list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) { | |
2338 | u8 bEndpointAddress; | |
2339 | ||
2340 | if (!ep->desc) | |
2341 | continue; | |
2342 | bEndpointAddress = ep->desc->bEndpointAddress; | |
2343 | if ((wIndex ^ bEndpointAddress) & USB_DIR_IN) | |
2344 | continue; | |
2345 | if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f)) | |
2346 | return ep; | |
2347 | } | |
2348 | return NULL; | |
2349 | } | |
2350 | ||
2351 | static void handle_stat0_irqs (struct net2280 *dev, u32 stat) | |
2352 | { | |
2353 | struct net2280_ep *ep; | |
2354 | u32 num, scratch; | |
2355 | ||
2356 | /* most of these don't need individual acks */ | |
2357 | stat &= ~(1 << INTA_ASSERTED); | |
2358 | if (!stat) | |
2359 | return; | |
2360 | // DEBUG (dev, "irqstat0 %04x\n", stat); | |
2361 | ||
2362 | /* starting a control request? */ | |
2363 | if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) { | |
2364 | union { | |
2365 | u32 raw [2]; | |
2366 | struct usb_ctrlrequest r; | |
2367 | } u; | |
950ee4c8 | 2368 | int tmp; |
1da177e4 LT |
2369 | struct net2280_request *req; |
2370 | ||
2371 | if (dev->gadget.speed == USB_SPEED_UNKNOWN) { | |
2372 | if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED)) | |
2373 | dev->gadget.speed = USB_SPEED_HIGH; | |
2374 | else | |
2375 | dev->gadget.speed = USB_SPEED_FULL; | |
2376 | net2280_led_speed (dev, dev->gadget.speed); | |
2377 | DEBUG (dev, "%s speed\n", | |
2378 | (dev->gadget.speed == USB_SPEED_HIGH) | |
2379 | ? "high" : "full"); | |
2380 | } | |
2381 | ||
2382 | ep = &dev->ep [0]; | |
2383 | ep->irqs++; | |
2384 | ||
2385 | /* make sure any leftover request state is cleared */ | |
2386 | stat &= ~(1 << ENDPOINT_0_INTERRUPT); | |
2387 | while (!list_empty (&ep->queue)) { | |
2388 | req = list_entry (ep->queue.next, | |
2389 | struct net2280_request, queue); | |
2390 | done (ep, req, (req->req.actual == req->req.length) | |
2391 | ? 0 : -EPROTO); | |
2392 | } | |
2393 | ep->stopped = 0; | |
2394 | dev->protocol_stall = 0; | |
950ee4c8 GL |
2395 | |
2396 | if (ep->dev->pdev->device == 0x2280) | |
2397 | tmp = (1 << FIFO_OVERFLOW) | |
2398 | | (1 << FIFO_UNDERFLOW); | |
2399 | else | |
2400 | tmp = 0; | |
2401 | ||
2402 | writel (tmp | (1 << TIMEOUT) | |
1da177e4 LT |
2403 | | (1 << USB_STALL_SENT) |
2404 | | (1 << USB_IN_NAK_SENT) | |
2405 | | (1 << USB_IN_ACK_RCVD) | |
2406 | | (1 << USB_OUT_PING_NAK_SENT) | |
2407 | | (1 << USB_OUT_ACK_SENT) | |
1da177e4 LT |
2408 | | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT) |
2409 | | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) | |
2410 | | (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
2411 | | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | |
2412 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
2413 | | (1 << DATA_IN_TOKEN_INTERRUPT) | |
2414 | , &ep->regs->ep_stat); | |
2415 | u.raw [0] = readl (&dev->usb->setup0123); | |
2416 | u.raw [1] = readl (&dev->usb->setup4567); | |
2417 | ||
2418 | cpu_to_le32s (&u.raw [0]); | |
2419 | cpu_to_le32s (&u.raw [1]); | |
2420 | ||
950ee4c8 GL |
2421 | tmp = 0; |
2422 | ||
320f3459 DB |
2423 | #define w_value le16_to_cpup (&u.r.wValue) |
2424 | #define w_index le16_to_cpup (&u.r.wIndex) | |
2425 | #define w_length le16_to_cpup (&u.r.wLength) | |
1da177e4 LT |
2426 | |
2427 | /* ack the irq */ | |
2428 | writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0); | |
2429 | stat ^= (1 << SETUP_PACKET_INTERRUPT); | |
2430 | ||
2431 | /* watch control traffic at the token level, and force | |
2432 | * synchronization before letting the status stage happen. | |
2433 | * FIXME ignore tokens we'll NAK, until driver responds. | |
2434 | * that'll mean a lot less irqs for some drivers. | |
2435 | */ | |
2436 | ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0; | |
2437 | if (ep->is_in) { | |
2438 | scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) | |
2439 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
2440 | | (1 << DATA_IN_TOKEN_INTERRUPT); | |
2441 | stop_out_naking (ep); | |
2442 | } else | |
2443 | scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT) | |
2444 | | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) | |
2445 | | (1 << DATA_IN_TOKEN_INTERRUPT); | |
2446 | writel (scratch, &dev->epregs [0].ep_irqenb); | |
2447 | ||
2448 | /* we made the hardware handle most lowlevel requests; | |
2449 | * everything else goes uplevel to the gadget code. | |
2450 | */ | |
2451 | switch (u.r.bRequest) { | |
2452 | case USB_REQ_GET_STATUS: { | |
2453 | struct net2280_ep *e; | |
320f3459 | 2454 | __le32 status; |
1da177e4 LT |
2455 | |
2456 | /* hw handles device and interface status */ | |
2457 | if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT)) | |
2458 | goto delegate; | |
320f3459 DB |
2459 | if ((e = get_ep_by_addr (dev, w_index)) == 0 |
2460 | || w_length > 2) | |
1da177e4 LT |
2461 | goto do_stall; |
2462 | ||
2463 | if (readl (&e->regs->ep_rsp) | |
2464 | & (1 << SET_ENDPOINT_HALT)) | |
320f3459 | 2465 | status = __constant_cpu_to_le32 (1); |
1da177e4 | 2466 | else |
320f3459 | 2467 | status = __constant_cpu_to_le32 (0); |
1da177e4 LT |
2468 | |
2469 | /* don't bother with a request object! */ | |
2470 | writel (0, &dev->epregs [0].ep_irqenb); | |
320f3459 DB |
2471 | set_fifo_bytecount (ep, w_length); |
2472 | writel ((__force u32)status, &dev->epregs [0].ep_data); | |
1da177e4 LT |
2473 | allow_status (ep); |
2474 | VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status); | |
2475 | goto next_endpoints; | |
2476 | } | |
2477 | break; | |
2478 | case USB_REQ_CLEAR_FEATURE: { | |
2479 | struct net2280_ep *e; | |
2480 | ||
2481 | /* hw handles device features */ | |
2482 | if (u.r.bRequestType != USB_RECIP_ENDPOINT) | |
2483 | goto delegate; | |
320f3459 DB |
2484 | if (w_value != USB_ENDPOINT_HALT |
2485 | || w_length != 0) | |
1da177e4 | 2486 | goto do_stall; |
320f3459 | 2487 | if ((e = get_ep_by_addr (dev, w_index)) == 0) |
1da177e4 LT |
2488 | goto do_stall; |
2489 | clear_halt (e); | |
2490 | allow_status (ep); | |
2491 | VDEBUG (dev, "%s clear halt\n", ep->ep.name); | |
2492 | goto next_endpoints; | |
2493 | } | |
2494 | break; | |
2495 | case USB_REQ_SET_FEATURE: { | |
2496 | struct net2280_ep *e; | |
2497 | ||
2498 | /* hw handles device features */ | |
2499 | if (u.r.bRequestType != USB_RECIP_ENDPOINT) | |
2500 | goto delegate; | |
320f3459 DB |
2501 | if (w_value != USB_ENDPOINT_HALT |
2502 | || w_length != 0) | |
1da177e4 | 2503 | goto do_stall; |
320f3459 | 2504 | if ((e = get_ep_by_addr (dev, w_index)) == 0) |
1da177e4 LT |
2505 | goto do_stall; |
2506 | set_halt (e); | |
2507 | allow_status (ep); | |
2508 | VDEBUG (dev, "%s set halt\n", ep->ep.name); | |
2509 | goto next_endpoints; | |
2510 | } | |
2511 | break; | |
2512 | default: | |
2513 | delegate: | |
320f3459 | 2514 | VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x" |
1da177e4 LT |
2515 | "ep_cfg %08x\n", |
2516 | u.r.bRequestType, u.r.bRequest, | |
320f3459 | 2517 | w_value, w_index, w_length, |
1da177e4 LT |
2518 | readl (&ep->regs->ep_cfg)); |
2519 | spin_unlock (&dev->lock); | |
2520 | tmp = dev->driver->setup (&dev->gadget, &u.r); | |
2521 | spin_lock (&dev->lock); | |
2522 | } | |
2523 | ||
2524 | /* stall ep0 on error */ | |
2525 | if (tmp < 0) { | |
2526 | do_stall: | |
2527 | VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n", | |
2528 | u.r.bRequestType, u.r.bRequest, tmp); | |
2529 | dev->protocol_stall = 1; | |
2530 | } | |
2531 | ||
2532 | /* some in/out token irq should follow; maybe stall then. | |
2533 | * driver must queue a request (even zlp) or halt ep0 | |
2534 | * before the host times out. | |
2535 | */ | |
2536 | } | |
2537 | ||
320f3459 DB |
2538 | #undef w_value |
2539 | #undef w_index | |
2540 | #undef w_length | |
2541 | ||
1da177e4 LT |
2542 | next_endpoints: |
2543 | /* endpoint data irq ? */ | |
2544 | scratch = stat & 0x7f; | |
2545 | stat &= ~0x7f; | |
2546 | for (num = 0; scratch; num++) { | |
2547 | u32 t; | |
2548 | ||
2549 | /* do this endpoint's FIFO and queue need tending? */ | |
2550 | t = 1 << num; | |
2551 | if ((scratch & t) == 0) | |
2552 | continue; | |
2553 | scratch ^= t; | |
2554 | ||
2555 | ep = &dev->ep [num]; | |
2556 | handle_ep_small (ep); | |
2557 | } | |
2558 | ||
2559 | if (stat) | |
2560 | DEBUG (dev, "unhandled irqstat0 %08x\n", stat); | |
2561 | } | |
2562 | ||
2563 | #define DMA_INTERRUPTS ( \ | |
2564 | (1 << DMA_D_INTERRUPT) \ | |
2565 | | (1 << DMA_C_INTERRUPT) \ | |
2566 | | (1 << DMA_B_INTERRUPT) \ | |
2567 | | (1 << DMA_A_INTERRUPT)) | |
2568 | #define PCI_ERROR_INTERRUPTS ( \ | |
2569 | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \ | |
2570 | | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \ | |
2571 | | (1 << PCI_RETRY_ABORT_INTERRUPT)) | |
2572 | ||
2573 | static void handle_stat1_irqs (struct net2280 *dev, u32 stat) | |
2574 | { | |
2575 | struct net2280_ep *ep; | |
2576 | u32 tmp, num, mask, scratch; | |
2577 | ||
2578 | /* after disconnect there's nothing else to do! */ | |
2579 | tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT); | |
2580 | mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED); | |
2581 | ||
2582 | /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set. | |
2583 | * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRRUPT set and | |
2584 | * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT | |
2585 | * only indicates a change in the reset state). | |
2586 | */ | |
2587 | if (stat & tmp) { | |
2588 | writel (tmp, &dev->regs->irqstat1); | |
2589 | if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT)) && | |
2590 | ((readl (&dev->usb->usbstat) & mask) == 0)) | |
2591 | || ((readl (&dev->usb->usbctl) & (1 << VBUS_PIN)) == 0) | |
2592 | ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) { | |
2593 | DEBUG (dev, "disconnect %s\n", | |
2594 | dev->driver->driver.name); | |
2595 | stop_activity (dev, dev->driver); | |
2596 | ep0_start (dev); | |
2597 | return; | |
2598 | } | |
2599 | stat &= ~tmp; | |
2600 | ||
2601 | /* vBUS can bounce ... one of many reasons to ignore the | |
2602 | * notion of hotplug events on bus connect/disconnect! | |
2603 | */ | |
2604 | if (!stat) | |
2605 | return; | |
2606 | } | |
2607 | ||
2608 | /* NOTE: chip stays in PCI D0 state for now, but it could | |
2609 | * enter D1 to save more power | |
2610 | */ | |
2611 | tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT); | |
2612 | if (stat & tmp) { | |
2613 | writel (tmp, &dev->regs->irqstat1); | |
2614 | if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) { | |
2615 | if (dev->driver->suspend) | |
2616 | dev->driver->suspend (&dev->gadget); | |
2617 | if (!enable_suspend) | |
2618 | stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT); | |
2619 | } else { | |
2620 | if (dev->driver->resume) | |
2621 | dev->driver->resume (&dev->gadget); | |
2622 | /* at high speed, note erratum 0133 */ | |
2623 | } | |
2624 | stat &= ~tmp; | |
2625 | } | |
2626 | ||
2627 | /* clear any other status/irqs */ | |
2628 | if (stat) | |
2629 | writel (stat, &dev->regs->irqstat1); | |
2630 | ||
2631 | /* some status we can just ignore */ | |
950ee4c8 GL |
2632 | if (dev->pdev->device == 0x2280) |
2633 | stat &= ~((1 << CONTROL_STATUS_INTERRUPT) | |
2634 | | (1 << SUSPEND_REQUEST_INTERRUPT) | |
2635 | | (1 << RESUME_INTERRUPT) | |
2636 | | (1 << SOF_INTERRUPT)); | |
2637 | else | |
2638 | stat &= ~((1 << CONTROL_STATUS_INTERRUPT) | |
2639 | | (1 << RESUME_INTERRUPT) | |
2640 | | (1 << SOF_DOWN_INTERRUPT) | |
2641 | | (1 << SOF_INTERRUPT)); | |
2642 | ||
1da177e4 LT |
2643 | if (!stat) |
2644 | return; | |
2645 | // DEBUG (dev, "irqstat1 %08x\n", stat); | |
2646 | ||
2647 | /* DMA status, for ep-{a,b,c,d} */ | |
2648 | scratch = stat & DMA_INTERRUPTS; | |
2649 | stat &= ~DMA_INTERRUPTS; | |
2650 | scratch >>= 9; | |
2651 | for (num = 0; scratch; num++) { | |
2652 | struct net2280_dma_regs __iomem *dma; | |
2653 | ||
2654 | tmp = 1 << num; | |
2655 | if ((tmp & scratch) == 0) | |
2656 | continue; | |
2657 | scratch ^= tmp; | |
2658 | ||
2659 | ep = &dev->ep [num + 1]; | |
2660 | dma = ep->dma; | |
2661 | ||
2662 | if (!dma) | |
2663 | continue; | |
2664 | ||
2665 | /* clear ep's dma status */ | |
2666 | tmp = readl (&dma->dmastat); | |
2667 | writel (tmp, &dma->dmastat); | |
2668 | ||
2669 | /* chaining should stop on abort, short OUT from fifo, | |
2670 | * or (stat0 codepath) short OUT transfer. | |
2671 | */ | |
2672 | if (!use_dma_chaining) { | |
2673 | if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT)) | |
2674 | == 0) { | |
2675 | DEBUG (ep->dev, "%s no xact done? %08x\n", | |
2676 | ep->ep.name, tmp); | |
2677 | continue; | |
2678 | } | |
2679 | stop_dma (ep->dma); | |
2680 | } | |
2681 | ||
2682 | /* OUT transfers terminate when the data from the | |
2683 | * host is in our memory. Process whatever's done. | |
2684 | * On this path, we know transfer's last packet wasn't | |
2685 | * less than req->length. NAK_OUT_PACKETS may be set, | |
2686 | * or the FIFO may already be holding new packets. | |
2687 | * | |
2688 | * IN transfers can linger in the FIFO for a very | |
2689 | * long time ... we ignore that for now, accounting | |
2690 | * precisely (like PIO does) needs per-packet irqs | |
2691 | */ | |
2692 | scan_dma_completions (ep); | |
2693 | ||
2694 | /* disable dma on inactive queues; else maybe restart */ | |
2695 | if (list_empty (&ep->queue)) { | |
2696 | if (use_dma_chaining) | |
2697 | stop_dma (ep->dma); | |
2698 | } else { | |
2699 | tmp = readl (&dma->dmactl); | |
2700 | if (!use_dma_chaining | |
2701 | || (tmp & (1 << DMA_ENABLE)) == 0) | |
2702 | restart_dma (ep); | |
2703 | else if (ep->is_in && use_dma_chaining) { | |
2704 | struct net2280_request *req; | |
320f3459 | 2705 | __le32 dmacount; |
1da177e4 LT |
2706 | |
2707 | /* the descriptor at the head of the chain | |
2708 | * may still have VALID_BIT clear; that's | |
2709 | * used to trigger changing DMA_FIFO_VALIDATE | |
2710 | * (affects automagic zlp writes). | |
2711 | */ | |
2712 | req = list_entry (ep->queue.next, | |
2713 | struct net2280_request, queue); | |
2714 | dmacount = req->td->dmacount; | |
2715 | dmacount &= __constant_cpu_to_le32 ( | |
2716 | (1 << VALID_BIT) | |
2717 | | DMA_BYTE_COUNT_MASK); | |
2718 | if (dmacount && (dmacount & valid_bit) == 0) | |
2719 | restart_dma (ep); | |
2720 | } | |
2721 | } | |
2722 | ep->irqs++; | |
2723 | } | |
2724 | ||
2725 | /* NOTE: there are other PCI errors we might usefully notice. | |
2726 | * if they appear very often, here's where to try recovering. | |
2727 | */ | |
2728 | if (stat & PCI_ERROR_INTERRUPTS) { | |
2729 | ERROR (dev, "pci dma error; stat %08x\n", stat); | |
2730 | stat &= ~PCI_ERROR_INTERRUPTS; | |
2731 | /* these are fatal errors, but "maybe" they won't | |
2732 | * happen again ... | |
2733 | */ | |
2734 | stop_activity (dev, dev->driver); | |
2735 | ep0_start (dev); | |
2736 | stat = 0; | |
2737 | } | |
2738 | ||
2739 | if (stat) | |
2740 | DEBUG (dev, "unhandled irqstat1 %08x\n", stat); | |
2741 | } | |
2742 | ||
2743 | static irqreturn_t net2280_irq (int irq, void *_dev, struct pt_regs * r) | |
2744 | { | |
2745 | struct net2280 *dev = _dev; | |
2746 | ||
2747 | spin_lock (&dev->lock); | |
2748 | ||
2749 | /* handle disconnect, dma, and more */ | |
2750 | handle_stat1_irqs (dev, readl (&dev->regs->irqstat1)); | |
2751 | ||
2752 | /* control requests and PIO */ | |
2753 | handle_stat0_irqs (dev, readl (&dev->regs->irqstat0)); | |
2754 | ||
2755 | spin_unlock (&dev->lock); | |
2756 | ||
2757 | return IRQ_HANDLED; | |
2758 | } | |
2759 | ||
2760 | /*-------------------------------------------------------------------------*/ | |
2761 | ||
2762 | static void gadget_release (struct device *_dev) | |
2763 | { | |
2764 | struct net2280 *dev = dev_get_drvdata (_dev); | |
2765 | ||
2766 | kfree (dev); | |
2767 | } | |
2768 | ||
2769 | /* tear down the binding between this driver and the pci device */ | |
2770 | ||
2771 | static void net2280_remove (struct pci_dev *pdev) | |
2772 | { | |
2773 | struct net2280 *dev = pci_get_drvdata (pdev); | |
2774 | ||
2775 | /* start with the driver above us */ | |
2776 | if (dev->driver) { | |
2777 | /* should have been done already by driver model core */ | |
2778 | WARN (dev, "pci remove, driver '%s' is still registered\n", | |
2779 | dev->driver->driver.name); | |
2780 | usb_gadget_unregister_driver (dev->driver); | |
2781 | } | |
2782 | ||
2783 | /* then clean up the resources we allocated during probe() */ | |
2784 | net2280_led_shutdown (dev); | |
2785 | if (dev->requests) { | |
2786 | int i; | |
2787 | for (i = 1; i < 5; i++) { | |
2788 | if (!dev->ep [i].dummy) | |
2789 | continue; | |
2790 | pci_pool_free (dev->requests, dev->ep [i].dummy, | |
2791 | dev->ep [i].td_dma); | |
2792 | } | |
2793 | pci_pool_destroy (dev->requests); | |
2794 | } | |
2795 | if (dev->got_irq) | |
2796 | free_irq (pdev->irq, dev); | |
2797 | if (dev->regs) | |
2798 | iounmap (dev->regs); | |
2799 | if (dev->region) | |
2800 | release_mem_region (pci_resource_start (pdev, 0), | |
2801 | pci_resource_len (pdev, 0)); | |
2802 | if (dev->enabled) | |
2803 | pci_disable_device (pdev); | |
2804 | device_unregister (&dev->gadget.dev); | |
2805 | device_remove_file (&pdev->dev, &dev_attr_registers); | |
2806 | pci_set_drvdata (pdev, NULL); | |
2807 | ||
2808 | INFO (dev, "unbind\n"); | |
2809 | ||
2810 | the_controller = NULL; | |
2811 | } | |
2812 | ||
2813 | /* wrap this driver around the specified device, but | |
2814 | * don't respond over USB until a gadget driver binds to us. | |
2815 | */ | |
2816 | ||
2817 | static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id) | |
2818 | { | |
2819 | struct net2280 *dev; | |
2820 | unsigned long resource, len; | |
2821 | void __iomem *base = NULL; | |
2822 | int retval, i; | |
2823 | char buf [8], *bufp; | |
2824 | ||
2825 | /* if you want to support more than one controller in a system, | |
2826 | * usb_gadget_driver_{register,unregister}() must change. | |
2827 | */ | |
2828 | if (the_controller) { | |
2829 | dev_warn (&pdev->dev, "ignoring\n"); | |
2830 | return -EBUSY; | |
2831 | } | |
2832 | ||
2833 | /* alloc, and start init */ | |
2834 | dev = kmalloc (sizeof *dev, SLAB_KERNEL); | |
2835 | if (dev == NULL){ | |
2836 | retval = -ENOMEM; | |
2837 | goto done; | |
2838 | } | |
2839 | ||
2840 | memset (dev, 0, sizeof *dev); | |
2841 | spin_lock_init (&dev->lock); | |
2842 | dev->pdev = pdev; | |
2843 | dev->gadget.ops = &net2280_ops; | |
2844 | dev->gadget.is_dualspeed = 1; | |
2845 | ||
2846 | /* the "gadget" abstracts/virtualizes the controller */ | |
2847 | strcpy (dev->gadget.dev.bus_id, "gadget"); | |
2848 | dev->gadget.dev.parent = &pdev->dev; | |
2849 | dev->gadget.dev.dma_mask = pdev->dev.dma_mask; | |
2850 | dev->gadget.dev.release = gadget_release; | |
2851 | dev->gadget.name = driver_name; | |
2852 | ||
2853 | /* now all the pci goodies ... */ | |
2854 | if (pci_enable_device (pdev) < 0) { | |
2855 | retval = -ENODEV; | |
2856 | goto done; | |
2857 | } | |
2858 | dev->enabled = 1; | |
2859 | ||
2860 | /* BAR 0 holds all the registers | |
2861 | * BAR 1 is 8051 memory; unused here (note erratum 0103) | |
2862 | * BAR 2 is fifo memory; unused here | |
2863 | */ | |
2864 | resource = pci_resource_start (pdev, 0); | |
2865 | len = pci_resource_len (pdev, 0); | |
2866 | if (!request_mem_region (resource, len, driver_name)) { | |
2867 | DEBUG (dev, "controller already in use\n"); | |
2868 | retval = -EBUSY; | |
2869 | goto done; | |
2870 | } | |
2871 | dev->region = 1; | |
2872 | ||
2873 | base = ioremap_nocache (resource, len); | |
2874 | if (base == NULL) { | |
2875 | DEBUG (dev, "can't map memory\n"); | |
2876 | retval = -EFAULT; | |
2877 | goto done; | |
2878 | } | |
2879 | dev->regs = (struct net2280_regs __iomem *) base; | |
2880 | dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080); | |
2881 | dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100); | |
2882 | dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180); | |
2883 | dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200); | |
2884 | dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300); | |
2885 | ||
2886 | /* put into initial config, link up all endpoints */ | |
2887 | writel (0, &dev->usb->usbctl); | |
2888 | usb_reset (dev); | |
2889 | usb_reinit (dev); | |
2890 | ||
2891 | /* irq setup after old hardware is cleaned up */ | |
2892 | if (!pdev->irq) { | |
2893 | ERROR (dev, "No IRQ. Check PCI setup!\n"); | |
2894 | retval = -ENODEV; | |
2895 | goto done; | |
2896 | } | |
2897 | #ifndef __sparc__ | |
2898 | scnprintf (buf, sizeof buf, "%d", pdev->irq); | |
2899 | bufp = buf; | |
2900 | #else | |
2901 | bufp = __irq_itoa(pdev->irq); | |
2902 | #endif | |
2903 | if (request_irq (pdev->irq, net2280_irq, SA_SHIRQ, driver_name, dev) | |
2904 | != 0) { | |
2905 | ERROR (dev, "request interrupt %s failed\n", bufp); | |
2906 | retval = -EBUSY; | |
2907 | goto done; | |
2908 | } | |
2909 | dev->got_irq = 1; | |
2910 | ||
2911 | /* DMA setup */ | |
2912 | /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */ | |
2913 | dev->requests = pci_pool_create ("requests", pdev, | |
2914 | sizeof (struct net2280_dma), | |
2915 | 0 /* no alignment requirements */, | |
2916 | 0 /* or page-crossing issues */); | |
2917 | if (!dev->requests) { | |
2918 | DEBUG (dev, "can't get request pool\n"); | |
2919 | retval = -ENOMEM; | |
2920 | goto done; | |
2921 | } | |
2922 | for (i = 1; i < 5; i++) { | |
2923 | struct net2280_dma *td; | |
2924 | ||
2925 | td = pci_pool_alloc (dev->requests, GFP_KERNEL, | |
2926 | &dev->ep [i].td_dma); | |
2927 | if (!td) { | |
2928 | DEBUG (dev, "can't get dummy %d\n", i); | |
2929 | retval = -ENOMEM; | |
2930 | goto done; | |
2931 | } | |
2932 | td->dmacount = 0; /* not VALID */ | |
2933 | td->dmaaddr = __constant_cpu_to_le32 (DMA_ADDR_INVALID); | |
2934 | td->dmadesc = td->dmaaddr; | |
2935 | dev->ep [i].dummy = td; | |
2936 | } | |
2937 | ||
2938 | /* enable lower-overhead pci memory bursts during DMA */ | |
2939 | writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) | |
2940 | // 256 write retries may not be enough... | |
2941 | // | (1 << PCI_RETRY_ABORT_ENABLE) | |
2942 | | (1 << DMA_READ_MULTIPLE_ENABLE) | |
2943 | | (1 << DMA_READ_LINE_ENABLE) | |
2944 | , &dev->pci->pcimstctl); | |
2945 | /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */ | |
2946 | pci_set_master (pdev); | |
2947 | pci_set_mwi (pdev); | |
2948 | ||
2949 | /* ... also flushes any posted pci writes */ | |
2950 | dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff; | |
2951 | ||
2952 | /* done */ | |
2953 | pci_set_drvdata (pdev, dev); | |
2954 | INFO (dev, "%s\n", driver_desc); | |
2955 | INFO (dev, "irq %s, pci mem %p, chip rev %04x\n", | |
2956 | bufp, base, dev->chiprev); | |
2957 | INFO (dev, "version: " DRIVER_VERSION "; dma %s\n", | |
2958 | use_dma | |
2959 | ? (use_dma_chaining ? "chaining" : "enabled") | |
2960 | : "disabled"); | |
2961 | the_controller = dev; | |
2962 | ||
2963 | device_register (&dev->gadget.dev); | |
2964 | device_create_file (&pdev->dev, &dev_attr_registers); | |
2965 | ||
2966 | return 0; | |
2967 | ||
2968 | done: | |
2969 | if (dev) | |
2970 | net2280_remove (pdev); | |
2971 | return retval; | |
2972 | } | |
2973 | ||
2974 | ||
2975 | /*-------------------------------------------------------------------------*/ | |
2976 | ||
2977 | static struct pci_device_id pci_ids [] = { { | |
2978 | .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), | |
2979 | .class_mask = ~0, | |
2980 | .vendor = 0x17cc, | |
2981 | .device = 0x2280, | |
2982 | .subvendor = PCI_ANY_ID, | |
2983 | .subdevice = PCI_ANY_ID, | |
950ee4c8 GL |
2984 | }, { |
2985 | .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), | |
2986 | .class_mask = ~0, | |
2987 | .vendor = 0x17cc, | |
2988 | .device = 0x2282, | |
2989 | .subvendor = PCI_ANY_ID, | |
2990 | .subdevice = PCI_ANY_ID, | |
1da177e4 LT |
2991 | |
2992 | }, { /* end: all zeroes */ } | |
2993 | }; | |
2994 | MODULE_DEVICE_TABLE (pci, pci_ids); | |
2995 | ||
2996 | /* pci driver glue; this is a "new style" PCI driver module */ | |
2997 | static struct pci_driver net2280_pci_driver = { | |
2998 | .name = (char *) driver_name, | |
2999 | .id_table = pci_ids, | |
3000 | ||
3001 | .probe = net2280_probe, | |
3002 | .remove = net2280_remove, | |
3003 | ||
3004 | /* FIXME add power management support */ | |
3005 | }; | |
3006 | ||
3007 | MODULE_DESCRIPTION (DRIVER_DESC); | |
3008 | MODULE_AUTHOR ("David Brownell"); | |
3009 | MODULE_LICENSE ("GPL"); | |
3010 | ||
3011 | static int __init init (void) | |
3012 | { | |
3013 | if (!use_dma) | |
3014 | use_dma_chaining = 0; | |
3015 | return pci_register_driver (&net2280_pci_driver); | |
3016 | } | |
3017 | module_init (init); | |
3018 | ||
3019 | static void __exit cleanup (void) | |
3020 | { | |
3021 | pci_unregister_driver (&net2280_pci_driver); | |
3022 | } | |
3023 | module_exit (cleanup); |