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bae4bd84 DB |
1 | /* |
2 | * at91_udc -- driver for at91-series USB peripheral controller | |
3 | * | |
4 | * Copyright (C) 2004 by Thomas Rathbone | |
5 | * Copyright (C) 2005 by HP Labs | |
6 | * Copyright (C) 2005 by David Brownell | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the | |
20 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | * Boston, MA 02111-1307, USA. | |
22 | */ | |
23 | ||
24 | #undef DEBUG | |
25 | #undef VERBOSE | |
26 | #undef PACKET_TRACE | |
27 | ||
bae4bd84 DB |
28 | #include <linux/kernel.h> |
29 | #include <linux/module.h> | |
30 | #include <linux/platform_device.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/ioport.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/smp_lock.h> | |
36 | #include <linux/errno.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/list.h> | |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/proc_fs.h> | |
41 | #include <linux/clk.h> | |
42 | #include <linux/usb_ch9.h> | |
43 | #include <linux/usb_gadget.h> | |
44 | ||
45 | #include <asm/byteorder.h> | |
46 | #include <asm/io.h> | |
47 | #include <asm/irq.h> | |
48 | #include <asm/system.h> | |
49 | #include <asm/mach-types.h> | |
50 | ||
51 | #include <asm/arch/hardware.h> | |
52 | #include <asm/arch/gpio.h> | |
53 | #include <asm/arch/board.h> | |
54 | ||
55 | #include "at91_udc.h" | |
56 | ||
57 | ||
58 | /* | |
59 | * This controller is simple and PIO-only. It's used in many AT91-series | |
8b2e7668 DB |
60 | * full speed USB controllers, including the at91rm9200 (arm920T, with MMU), |
61 | * at91sam926x (arm926ejs, with MMU), and several no-mmu versions. | |
bae4bd84 DB |
62 | * |
63 | * This driver expects the board has been wired with two GPIOs suppporting | |
64 | * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the | |
8b2e7668 DB |
65 | * testing hasn't covered such cases.) |
66 | * | |
67 | * The pullup is most important (so it's integrated on sam926x parts). It | |
bae4bd84 | 68 | * provides software control over whether the host enumerates the device. |
8b2e7668 | 69 | * |
bae4bd84 DB |
70 | * The VBUS sensing helps during enumeration, and allows both USB clocks |
71 | * (and the transceiver) to stay gated off until they're necessary, saving | |
8b2e7668 DB |
72 | * power. During USB suspend, the 48 MHz clock is gated off in hardware; |
73 | * it may also be gated off by software during some Linux sleep states. | |
bae4bd84 DB |
74 | */ |
75 | ||
8b2e7668 | 76 | #define DRIVER_VERSION "3 May 2006" |
bae4bd84 DB |
77 | |
78 | static const char driver_name [] = "at91_udc"; | |
79 | static const char ep0name[] = "ep0"; | |
80 | ||
81 | /*-------------------------------------------------------------------------*/ | |
82 | ||
83 | /* | |
84 | * Read from a UDP register. | |
85 | */ | |
86 | static inline unsigned long at91_udp_read(unsigned int reg) | |
87 | { | |
88 | void __iomem *udp_base = (void __iomem *)AT91_VA_BASE_UDP; | |
89 | ||
90 | return __raw_readl(udp_base + reg); | |
91 | } | |
92 | ||
93 | /* | |
94 | * Write to a UDP register. | |
95 | */ | |
96 | static inline void at91_udp_write(unsigned int reg, unsigned long value) | |
97 | { | |
98 | void __iomem *udp_base = (void __iomem *)AT91_VA_BASE_UDP; | |
99 | ||
100 | __raw_writel(value, udp_base + reg); | |
101 | } | |
102 | ||
103 | /*-------------------------------------------------------------------------*/ | |
104 | ||
105 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES | |
106 | ||
107 | #include <linux/seq_file.h> | |
108 | ||
109 | static const char debug_filename[] = "driver/udc"; | |
110 | ||
111 | #define FOURBITS "%s%s%s%s" | |
112 | #define EIGHTBITS FOURBITS FOURBITS | |
113 | ||
114 | static void proc_ep_show(struct seq_file *s, struct at91_ep *ep) | |
115 | { | |
116 | static char *types[] = { | |
117 | "control", "out-iso", "out-bulk", "out-int", | |
118 | "BOGUS", "in-iso", "in-bulk", "in-int"}; | |
119 | ||
120 | u32 csr; | |
121 | struct at91_request *req; | |
122 | unsigned long flags; | |
123 | ||
124 | local_irq_save(flags); | |
125 | ||
126 | csr = __raw_readl(ep->creg); | |
127 | ||
128 | /* NOTE: not collecting per-endpoint irq statistics... */ | |
129 | ||
130 | seq_printf(s, "\n"); | |
131 | seq_printf(s, "%s, maxpacket %d %s%s %s%s\n", | |
132 | ep->ep.name, ep->ep.maxpacket, | |
133 | ep->is_in ? "in" : "out", | |
134 | ep->is_iso ? " iso" : "", | |
135 | ep->is_pingpong | |
136 | ? (ep->fifo_bank ? "pong" : "ping") | |
137 | : "", | |
138 | ep->stopped ? " stopped" : ""); | |
139 | seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n", | |
140 | csr, | |
141 | (csr & 0x07ff0000) >> 16, | |
142 | (csr & (1 << 15)) ? "enabled" : "disabled", | |
143 | (csr & (1 << 11)) ? "DATA1" : "DATA0", | |
144 | types[(csr & 0x700) >> 8], | |
145 | ||
146 | /* iff type is control then print current direction */ | |
147 | (!(csr & 0x700)) | |
148 | ? ((csr & (1 << 7)) ? " IN" : " OUT") | |
149 | : "", | |
150 | (csr & (1 << 6)) ? " rxdatabk1" : "", | |
151 | (csr & (1 << 5)) ? " forcestall" : "", | |
152 | (csr & (1 << 4)) ? " txpktrdy" : "", | |
153 | ||
154 | (csr & (1 << 3)) ? " stallsent" : "", | |
155 | (csr & (1 << 2)) ? " rxsetup" : "", | |
156 | (csr & (1 << 1)) ? " rxdatabk0" : "", | |
157 | (csr & (1 << 0)) ? " txcomp" : ""); | |
158 | if (list_empty (&ep->queue)) | |
159 | seq_printf(s, "\t(queue empty)\n"); | |
160 | ||
161 | else list_for_each_entry (req, &ep->queue, queue) { | |
162 | unsigned length = req->req.actual; | |
163 | ||
164 | seq_printf(s, "\treq %p len %d/%d buf %p\n", | |
165 | &req->req, length, | |
166 | req->req.length, req->req.buf); | |
167 | } | |
168 | local_irq_restore(flags); | |
169 | } | |
170 | ||
171 | static void proc_irq_show(struct seq_file *s, const char *label, u32 mask) | |
172 | { | |
173 | int i; | |
174 | ||
175 | seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask, | |
176 | (mask & (1 << 13)) ? " wakeup" : "", | |
177 | (mask & (1 << 12)) ? " endbusres" : "", | |
178 | ||
179 | (mask & (1 << 11)) ? " sofint" : "", | |
180 | (mask & (1 << 10)) ? " extrsm" : "", | |
181 | (mask & (1 << 9)) ? " rxrsm" : "", | |
182 | (mask & (1 << 8)) ? " rxsusp" : ""); | |
183 | for (i = 0; i < 8; i++) { | |
184 | if (mask & (1 << i)) | |
185 | seq_printf(s, " ep%d", i); | |
186 | } | |
187 | seq_printf(s, "\n"); | |
188 | } | |
189 | ||
190 | static int proc_udc_show(struct seq_file *s, void *unused) | |
191 | { | |
192 | struct at91_udc *udc = s->private; | |
193 | struct at91_ep *ep; | |
194 | u32 tmp; | |
195 | ||
196 | seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION); | |
197 | ||
198 | seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n", | |
199 | udc->vbus ? "present" : "off", | |
200 | udc->enabled | |
201 | ? (udc->vbus ? "active" : "enabled") | |
202 | : "disabled", | |
203 | udc->selfpowered ? "self" : "VBUS", | |
204 | udc->suspended ? ", suspended" : "", | |
205 | udc->driver ? udc->driver->driver.name : "(none)"); | |
206 | ||
207 | /* don't access registers when interface isn't clocked */ | |
208 | if (!udc->clocked) { | |
209 | seq_printf(s, "(not clocked)\n"); | |
210 | return 0; | |
211 | } | |
212 | ||
213 | tmp = at91_udp_read(AT91_UDP_FRM_NUM); | |
214 | seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp, | |
215 | (tmp & AT91_UDP_FRM_OK) ? " ok" : "", | |
216 | (tmp & AT91_UDP_FRM_ERR) ? " err" : "", | |
217 | (tmp & AT91_UDP_NUM)); | |
218 | ||
219 | tmp = at91_udp_read(AT91_UDP_GLB_STAT); | |
220 | seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp, | |
221 | (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "", | |
222 | (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "", | |
223 | (tmp & AT91_UDP_ESR) ? " esr" : "", | |
224 | (tmp & AT91_UDP_CONFG) ? " confg" : "", | |
225 | (tmp & AT91_UDP_FADDEN) ? " fadden" : ""); | |
226 | ||
227 | tmp = at91_udp_read(AT91_UDP_FADDR); | |
228 | seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp, | |
229 | (tmp & AT91_UDP_FEN) ? " fen" : "", | |
230 | (tmp & AT91_UDP_FADD)); | |
231 | ||
232 | proc_irq_show(s, "imr ", at91_udp_read(AT91_UDP_IMR)); | |
233 | proc_irq_show(s, "isr ", at91_udp_read(AT91_UDP_ISR)); | |
234 | ||
235 | if (udc->enabled && udc->vbus) { | |
236 | proc_ep_show(s, &udc->ep[0]); | |
237 | list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) { | |
238 | if (ep->desc) | |
239 | proc_ep_show(s, ep); | |
240 | } | |
241 | } | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static int proc_udc_open(struct inode *inode, struct file *file) | |
246 | { | |
247 | return single_open(file, proc_udc_show, PDE(inode)->data); | |
248 | } | |
249 | ||
066202dd | 250 | static const struct file_operations proc_ops = { |
bae4bd84 DB |
251 | .open = proc_udc_open, |
252 | .read = seq_read, | |
253 | .llseek = seq_lseek, | |
254 | .release = single_release, | |
255 | }; | |
256 | ||
257 | static void create_debug_file(struct at91_udc *udc) | |
258 | { | |
259 | struct proc_dir_entry *pde; | |
260 | ||
261 | pde = create_proc_entry (debug_filename, 0, NULL); | |
262 | udc->pde = pde; | |
263 | if (pde == NULL) | |
264 | return; | |
265 | ||
266 | pde->proc_fops = &proc_ops; | |
267 | pde->data = udc; | |
268 | } | |
269 | ||
270 | static void remove_debug_file(struct at91_udc *udc) | |
271 | { | |
272 | if (udc->pde) | |
273 | remove_proc_entry(debug_filename, NULL); | |
274 | } | |
275 | ||
276 | #else | |
277 | ||
278 | static inline void create_debug_file(struct at91_udc *udc) {} | |
279 | static inline void remove_debug_file(struct at91_udc *udc) {} | |
280 | ||
281 | #endif | |
282 | ||
283 | ||
284 | /*-------------------------------------------------------------------------*/ | |
285 | ||
286 | static void done(struct at91_ep *ep, struct at91_request *req, int status) | |
287 | { | |
288 | unsigned stopped = ep->stopped; | |
289 | ||
290 | list_del_init(&req->queue); | |
291 | if (req->req.status == -EINPROGRESS) | |
292 | req->req.status = status; | |
293 | else | |
294 | status = req->req.status; | |
295 | if (status && status != -ESHUTDOWN) | |
296 | VDBG("%s done %p, status %d\n", ep->ep.name, req, status); | |
297 | ||
298 | ep->stopped = 1; | |
299 | req->req.complete(&ep->ep, &req->req); | |
300 | ep->stopped = stopped; | |
301 | ||
302 | /* ep0 is always ready; other endpoints need a non-empty queue */ | |
303 | if (list_empty(&ep->queue) && ep->int_mask != (1 << 0)) | |
304 | at91_udp_write(AT91_UDP_IDR, ep->int_mask); | |
305 | } | |
306 | ||
307 | /*-------------------------------------------------------------------------*/ | |
308 | ||
309 | /* bits indicating OUT fifo has data ready */ | |
310 | #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1) | |
311 | ||
312 | /* | |
313 | * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write | |
314 | * back most of the value you just read (because of side effects, including | |
315 | * bits that may change after reading and before writing). | |
316 | * | |
317 | * Except when changing a specific bit, always write values which: | |
318 | * - clear SET_FX bits (setting them could change something) | |
319 | * - set CLR_FX bits (clearing them could change something) | |
320 | * | |
321 | * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE | |
322 | * that shouldn't normally be changed. | |
8b2e7668 DB |
323 | * |
324 | * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains, | |
325 | * implying a need to wait for one write to complete (test relevant bits) | |
326 | * before starting the next write. This shouldn't be an issue given how | |
327 | * infrequently we write, except maybe for write-then-read idioms. | |
bae4bd84 DB |
328 | */ |
329 | #define SET_FX (AT91_UDP_TXPKTRDY) | |
8b2e7668 DB |
330 | #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \ |
331 | | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP) | |
bae4bd84 DB |
332 | |
333 | /* pull OUT packet data from the endpoint's fifo */ | |
334 | static int read_fifo (struct at91_ep *ep, struct at91_request *req) | |
335 | { | |
336 | u32 __iomem *creg = ep->creg; | |
337 | u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); | |
338 | u32 csr; | |
339 | u8 *buf; | |
340 | unsigned int count, bufferspace, is_done; | |
341 | ||
342 | buf = req->req.buf + req->req.actual; | |
343 | bufferspace = req->req.length - req->req.actual; | |
344 | ||
345 | /* | |
346 | * there might be nothing to read if ep_queue() calls us, | |
347 | * or if we already emptied both pingpong buffers | |
348 | */ | |
349 | rescan: | |
350 | csr = __raw_readl(creg); | |
351 | if ((csr & RX_DATA_READY) == 0) | |
352 | return 0; | |
353 | ||
354 | count = (csr & AT91_UDP_RXBYTECNT) >> 16; | |
355 | if (count > ep->ep.maxpacket) | |
356 | count = ep->ep.maxpacket; | |
357 | if (count > bufferspace) { | |
358 | DBG("%s buffer overflow\n", ep->ep.name); | |
359 | req->req.status = -EOVERFLOW; | |
360 | count = bufferspace; | |
361 | } | |
362 | __raw_readsb(dreg, buf, count); | |
363 | ||
364 | /* release and swap pingpong mem bank */ | |
365 | csr |= CLR_FX; | |
366 | if (ep->is_pingpong) { | |
367 | if (ep->fifo_bank == 0) { | |
368 | csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); | |
369 | ep->fifo_bank = 1; | |
370 | } else { | |
371 | csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1); | |
372 | ep->fifo_bank = 0; | |
373 | } | |
374 | } else | |
375 | csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); | |
376 | __raw_writel(csr, creg); | |
377 | ||
378 | req->req.actual += count; | |
379 | is_done = (count < ep->ep.maxpacket); | |
380 | if (count == bufferspace) | |
381 | is_done = 1; | |
382 | ||
383 | PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count, | |
384 | is_done ? " (done)" : ""); | |
385 | ||
386 | /* | |
387 | * avoid extra trips through IRQ logic for packets already in | |
388 | * the fifo ... maybe preventing an extra (expensive) OUT-NAK | |
389 | */ | |
390 | if (is_done) | |
391 | done(ep, req, 0); | |
392 | else if (ep->is_pingpong) { | |
393 | bufferspace -= count; | |
394 | buf += count; | |
395 | goto rescan; | |
396 | } | |
397 | ||
398 | return is_done; | |
399 | } | |
400 | ||
401 | /* load fifo for an IN packet */ | |
402 | static int write_fifo(struct at91_ep *ep, struct at91_request *req) | |
403 | { | |
404 | u32 __iomem *creg = ep->creg; | |
405 | u32 csr = __raw_readl(creg); | |
406 | u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); | |
407 | unsigned total, count, is_last; | |
408 | ||
409 | /* | |
410 | * TODO: allow for writing two packets to the fifo ... that'll | |
411 | * reduce the amount of IN-NAKing, but probably won't affect | |
412 | * throughput much. (Unlike preventing OUT-NAKing!) | |
413 | */ | |
414 | ||
415 | /* | |
416 | * If ep_queue() calls us, the queue is empty and possibly in | |
417 | * odd states like TXCOMP not yet cleared (we do it, saving at | |
418 | * least one IRQ) or the fifo not yet being free. Those aren't | |
419 | * issues normally (IRQ handler fast path). | |
420 | */ | |
421 | if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) { | |
422 | if (csr & AT91_UDP_TXCOMP) { | |
423 | csr |= CLR_FX; | |
424 | csr &= ~(SET_FX | AT91_UDP_TXCOMP); | |
425 | __raw_writel(csr, creg); | |
426 | csr = __raw_readl(creg); | |
427 | } | |
428 | if (csr & AT91_UDP_TXPKTRDY) | |
429 | return 0; | |
430 | } | |
431 | ||
432 | total = req->req.length - req->req.actual; | |
433 | if (ep->ep.maxpacket < total) { | |
434 | count = ep->ep.maxpacket; | |
435 | is_last = 0; | |
436 | } else { | |
437 | count = total; | |
438 | is_last = (count < ep->ep.maxpacket) || !req->req.zero; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Write the packet, maybe it's a ZLP. | |
443 | * | |
444 | * NOTE: incrementing req->actual before we receive the ACK means | |
445 | * gadget driver IN bytecounts can be wrong in fault cases. That's | |
446 | * fixable with PIO drivers like this one (save "count" here, and | |
447 | * do the increment later on TX irq), but not for most DMA hardware. | |
448 | * | |
449 | * So all gadget drivers must accept that potential error. Some | |
450 | * hardware supports precise fifo status reporting, letting them | |
451 | * recover when the actual bytecount matters (e.g. for USB Test | |
452 | * and Measurement Class devices). | |
453 | */ | |
454 | __raw_writesb(dreg, req->req.buf + req->req.actual, count); | |
455 | csr &= ~SET_FX; | |
456 | csr |= CLR_FX | AT91_UDP_TXPKTRDY; | |
457 | __raw_writel(csr, creg); | |
458 | req->req.actual += count; | |
459 | ||
460 | PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count, | |
461 | is_last ? " (done)" : ""); | |
462 | if (is_last) | |
463 | done(ep, req, 0); | |
464 | return is_last; | |
465 | } | |
466 | ||
467 | static void nuke(struct at91_ep *ep, int status) | |
468 | { | |
469 | struct at91_request *req; | |
470 | ||
471 | // terminer chaque requete dans la queue | |
472 | ep->stopped = 1; | |
473 | if (list_empty(&ep->queue)) | |
474 | return; | |
475 | ||
476 | VDBG("%s %s\n", __FUNCTION__, ep->ep.name); | |
477 | while (!list_empty(&ep->queue)) { | |
478 | req = list_entry(ep->queue.next, struct at91_request, queue); | |
479 | done(ep, req, status); | |
480 | } | |
481 | } | |
482 | ||
483 | /*-------------------------------------------------------------------------*/ | |
484 | ||
8b2e7668 DB |
485 | static int at91_ep_enable(struct usb_ep *_ep, |
486 | const struct usb_endpoint_descriptor *desc) | |
bae4bd84 DB |
487 | { |
488 | struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); | |
489 | struct at91_udc *dev = ep->udc; | |
490 | u16 maxpacket; | |
491 | u32 tmp; | |
492 | unsigned long flags; | |
493 | ||
494 | if (!_ep || !ep | |
495 | || !desc || ep->desc | |
496 | || _ep->name == ep0name | |
497 | || desc->bDescriptorType != USB_DT_ENDPOINT | |
498 | || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0 | |
499 | || maxpacket > ep->maxpacket) { | |
500 | DBG("bad ep or descriptor\n"); | |
501 | return -EINVAL; | |
502 | } | |
503 | ||
504 | if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { | |
505 | DBG("bogus device state\n"); | |
506 | return -ESHUTDOWN; | |
507 | } | |
508 | ||
509 | tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; | |
510 | switch (tmp) { | |
511 | case USB_ENDPOINT_XFER_CONTROL: | |
512 | DBG("only one control endpoint\n"); | |
513 | return -EINVAL; | |
514 | case USB_ENDPOINT_XFER_INT: | |
515 | if (maxpacket > 64) | |
516 | goto bogus_max; | |
517 | break; | |
518 | case USB_ENDPOINT_XFER_BULK: | |
519 | switch (maxpacket) { | |
520 | case 8: | |
521 | case 16: | |
522 | case 32: | |
523 | case 64: | |
524 | goto ok; | |
525 | } | |
526 | bogus_max: | |
527 | DBG("bogus maxpacket %d\n", maxpacket); | |
528 | return -EINVAL; | |
529 | case USB_ENDPOINT_XFER_ISOC: | |
530 | if (!ep->is_pingpong) { | |
531 | DBG("iso requires double buffering\n"); | |
532 | return -EINVAL; | |
533 | } | |
534 | break; | |
535 | } | |
536 | ||
537 | ok: | |
538 | local_irq_save(flags); | |
539 | ||
540 | /* initialize endpoint to match this descriptor */ | |
541 | ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0; | |
542 | ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC); | |
543 | ep->stopped = 0; | |
544 | if (ep->is_in) | |
545 | tmp |= 0x04; | |
546 | tmp <<= 8; | |
547 | tmp |= AT91_UDP_EPEDS; | |
548 | __raw_writel(tmp, ep->creg); | |
549 | ||
550 | ep->desc = desc; | |
551 | ep->ep.maxpacket = maxpacket; | |
552 | ||
553 | /* | |
554 | * reset/init endpoint fifo. NOTE: leaves fifo_bank alone, | |
555 | * since endpoint resets don't reset hw pingpong state. | |
556 | */ | |
557 | at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); | |
558 | at91_udp_write(AT91_UDP_RST_EP, 0); | |
559 | ||
560 | local_irq_restore(flags); | |
561 | return 0; | |
562 | } | |
563 | ||
564 | static int at91_ep_disable (struct usb_ep * _ep) | |
565 | { | |
566 | struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); | |
567 | unsigned long flags; | |
568 | ||
569 | if (ep == &ep->udc->ep[0]) | |
570 | return -EINVAL; | |
571 | ||
572 | local_irq_save(flags); | |
573 | ||
574 | nuke(ep, -ESHUTDOWN); | |
575 | ||
576 | /* restore the endpoint's pristine config */ | |
577 | ep->desc = NULL; | |
578 | ep->ep.maxpacket = ep->maxpacket; | |
579 | ||
580 | /* reset fifos and endpoint */ | |
581 | if (ep->udc->clocked) { | |
582 | at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); | |
583 | at91_udp_write(AT91_UDP_RST_EP, 0); | |
584 | __raw_writel(0, ep->creg); | |
585 | } | |
586 | ||
587 | local_irq_restore(flags); | |
588 | return 0; | |
589 | } | |
590 | ||
591 | /* | |
592 | * this is a PIO-only driver, so there's nothing | |
593 | * interesting for request or buffer allocation. | |
594 | */ | |
595 | ||
8b2e7668 DB |
596 | static struct usb_request * |
597 | at91_ep_alloc_request(struct usb_ep *_ep, unsigned int gfp_flags) | |
bae4bd84 DB |
598 | { |
599 | struct at91_request *req; | |
600 | ||
8b2e7668 | 601 | req = kcalloc(1, sizeof (struct at91_request), gfp_flags); |
bae4bd84 DB |
602 | if (!req) |
603 | return NULL; | |
604 | ||
605 | INIT_LIST_HEAD(&req->queue); | |
606 | return &req->req; | |
607 | } | |
608 | ||
609 | static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req) | |
610 | { | |
611 | struct at91_request *req; | |
612 | ||
613 | req = container_of(_req, struct at91_request, req); | |
614 | BUG_ON(!list_empty(&req->queue)); | |
615 | kfree(req); | |
616 | } | |
617 | ||
618 | static void *at91_ep_alloc_buffer( | |
619 | struct usb_ep *_ep, | |
620 | unsigned bytes, | |
621 | dma_addr_t *dma, | |
622 | gfp_t gfp_flags) | |
623 | { | |
624 | *dma = ~0; | |
625 | return kmalloc(bytes, gfp_flags); | |
626 | } | |
627 | ||
628 | static void at91_ep_free_buffer( | |
629 | struct usb_ep *ep, | |
630 | void *buf, | |
631 | dma_addr_t dma, | |
632 | unsigned bytes) | |
633 | { | |
634 | kfree(buf); | |
635 | } | |
636 | ||
637 | static int at91_ep_queue(struct usb_ep *_ep, | |
638 | struct usb_request *_req, gfp_t gfp_flags) | |
639 | { | |
640 | struct at91_request *req; | |
641 | struct at91_ep *ep; | |
642 | struct at91_udc *dev; | |
643 | int status; | |
644 | unsigned long flags; | |
645 | ||
646 | req = container_of(_req, struct at91_request, req); | |
647 | ep = container_of(_ep, struct at91_ep, ep); | |
648 | ||
649 | if (!_req || !_req->complete | |
650 | || !_req->buf || !list_empty(&req->queue)) { | |
651 | DBG("invalid request\n"); | |
652 | return -EINVAL; | |
653 | } | |
654 | ||
655 | if (!_ep || (!ep->desc && ep->ep.name != ep0name)) { | |
656 | DBG("invalid ep\n"); | |
657 | return -EINVAL; | |
658 | } | |
659 | ||
660 | dev = ep->udc; | |
661 | ||
662 | if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { | |
663 | DBG("invalid device\n"); | |
664 | return -EINVAL; | |
665 | } | |
666 | ||
667 | _req->status = -EINPROGRESS; | |
668 | _req->actual = 0; | |
669 | ||
670 | local_irq_save(flags); | |
671 | ||
672 | /* try to kickstart any empty and idle queue */ | |
673 | if (list_empty(&ep->queue) && !ep->stopped) { | |
674 | int is_ep0; | |
675 | ||
676 | /* | |
677 | * If this control request has a non-empty DATA stage, this | |
678 | * will start that stage. It works just like a non-control | |
679 | * request (until the status stage starts, maybe early). | |
680 | * | |
681 | * If the data stage is empty, then this starts a successful | |
682 | * IN/STATUS stage. (Unsuccessful ones use set_halt.) | |
683 | */ | |
684 | is_ep0 = (ep->ep.name == ep0name); | |
685 | if (is_ep0) { | |
686 | u32 tmp; | |
687 | ||
688 | if (!dev->req_pending) { | |
689 | status = -EINVAL; | |
690 | goto done; | |
691 | } | |
692 | ||
693 | /* | |
694 | * defer changing CONFG until after the gadget driver | |
695 | * reconfigures the endpoints. | |
696 | */ | |
697 | if (dev->wait_for_config_ack) { | |
698 | tmp = at91_udp_read(AT91_UDP_GLB_STAT); | |
699 | tmp ^= AT91_UDP_CONFG; | |
700 | VDBG("toggle config\n"); | |
701 | at91_udp_write(AT91_UDP_GLB_STAT, tmp); | |
702 | } | |
703 | if (req->req.length == 0) { | |
704 | ep0_in_status: | |
705 | PACKET("ep0 in/status\n"); | |
706 | status = 0; | |
707 | tmp = __raw_readl(ep->creg); | |
708 | tmp &= ~SET_FX; | |
709 | tmp |= CLR_FX | AT91_UDP_TXPKTRDY; | |
710 | __raw_writel(tmp, ep->creg); | |
711 | dev->req_pending = 0; | |
712 | goto done; | |
713 | } | |
714 | } | |
715 | ||
716 | if (ep->is_in) | |
717 | status = write_fifo(ep, req); | |
718 | else { | |
719 | status = read_fifo(ep, req); | |
720 | ||
721 | /* IN/STATUS stage is otherwise triggered by irq */ | |
722 | if (status && is_ep0) | |
723 | goto ep0_in_status; | |
724 | } | |
725 | } else | |
726 | status = 0; | |
727 | ||
728 | if (req && !status) { | |
729 | list_add_tail (&req->queue, &ep->queue); | |
730 | at91_udp_write(AT91_UDP_IER, ep->int_mask); | |
731 | } | |
732 | done: | |
733 | local_irq_restore(flags); | |
734 | return (status < 0) ? status : 0; | |
735 | } | |
736 | ||
737 | static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) | |
738 | { | |
739 | struct at91_ep *ep; | |
740 | struct at91_request *req; | |
741 | ||
742 | ep = container_of(_ep, struct at91_ep, ep); | |
743 | if (!_ep || ep->ep.name == ep0name) | |
744 | return -EINVAL; | |
745 | ||
746 | /* make sure it's actually queued on this endpoint */ | |
747 | list_for_each_entry (req, &ep->queue, queue) { | |
748 | if (&req->req == _req) | |
749 | break; | |
750 | } | |
751 | if (&req->req != _req) | |
752 | return -EINVAL; | |
753 | ||
754 | done(ep, req, -ECONNRESET); | |
755 | return 0; | |
756 | } | |
757 | ||
758 | static int at91_ep_set_halt(struct usb_ep *_ep, int value) | |
759 | { | |
760 | struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); | |
761 | u32 __iomem *creg; | |
762 | u32 csr; | |
763 | unsigned long flags; | |
764 | int status = 0; | |
765 | ||
766 | if (!_ep || ep->is_iso || !ep->udc->clocked) | |
767 | return -EINVAL; | |
768 | ||
769 | creg = ep->creg; | |
770 | local_irq_save(flags); | |
771 | ||
772 | csr = __raw_readl(creg); | |
773 | ||
774 | /* | |
775 | * fail with still-busy IN endpoints, ensuring correct sequencing | |
776 | * of data tx then stall. note that the fifo rx bytecount isn't | |
777 | * completely accurate as a tx bytecount. | |
778 | */ | |
779 | if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0)) | |
780 | status = -EAGAIN; | |
781 | else { | |
782 | csr |= CLR_FX; | |
783 | csr &= ~SET_FX; | |
784 | if (value) { | |
785 | csr |= AT91_UDP_FORCESTALL; | |
786 | VDBG("halt %s\n", ep->ep.name); | |
787 | } else { | |
788 | at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); | |
789 | at91_udp_write(AT91_UDP_RST_EP, 0); | |
790 | csr &= ~AT91_UDP_FORCESTALL; | |
791 | } | |
792 | __raw_writel(csr, creg); | |
793 | } | |
794 | ||
795 | local_irq_restore(flags); | |
796 | return status; | |
797 | } | |
798 | ||
799 | static struct usb_ep_ops at91_ep_ops = { | |
800 | .enable = at91_ep_enable, | |
801 | .disable = at91_ep_disable, | |
802 | .alloc_request = at91_ep_alloc_request, | |
803 | .free_request = at91_ep_free_request, | |
804 | .alloc_buffer = at91_ep_alloc_buffer, | |
805 | .free_buffer = at91_ep_free_buffer, | |
806 | .queue = at91_ep_queue, | |
807 | .dequeue = at91_ep_dequeue, | |
808 | .set_halt = at91_ep_set_halt, | |
809 | // there's only imprecise fifo status reporting | |
810 | }; | |
811 | ||
812 | /*-------------------------------------------------------------------------*/ | |
813 | ||
814 | static int at91_get_frame(struct usb_gadget *gadget) | |
815 | { | |
816 | if (!to_udc(gadget)->clocked) | |
817 | return -EINVAL; | |
818 | return at91_udp_read(AT91_UDP_FRM_NUM) & AT91_UDP_NUM; | |
819 | } | |
820 | ||
821 | static int at91_wakeup(struct usb_gadget *gadget) | |
822 | { | |
823 | struct at91_udc *udc = to_udc(gadget); | |
824 | u32 glbstate; | |
825 | int status = -EINVAL; | |
826 | unsigned long flags; | |
827 | ||
828 | DBG("%s\n", __FUNCTION__ ); | |
829 | local_irq_save(flags); | |
830 | ||
831 | if (!udc->clocked || !udc->suspended) | |
832 | goto done; | |
833 | ||
834 | /* NOTE: some "early versions" handle ESR differently ... */ | |
835 | ||
836 | glbstate = at91_udp_read(AT91_UDP_GLB_STAT); | |
837 | if (!(glbstate & AT91_UDP_ESR)) | |
838 | goto done; | |
839 | glbstate |= AT91_UDP_ESR; | |
840 | at91_udp_write(AT91_UDP_GLB_STAT, glbstate); | |
841 | ||
842 | done: | |
843 | local_irq_restore(flags); | |
844 | return status; | |
845 | } | |
846 | ||
847 | /* reinit == restore inital software state */ | |
848 | static void udc_reinit(struct at91_udc *udc) | |
849 | { | |
850 | u32 i; | |
851 | ||
852 | INIT_LIST_HEAD(&udc->gadget.ep_list); | |
853 | INIT_LIST_HEAD(&udc->gadget.ep0->ep_list); | |
854 | ||
855 | for (i = 0; i < NUM_ENDPOINTS; i++) { | |
856 | struct at91_ep *ep = &udc->ep[i]; | |
857 | ||
858 | if (i != 0) | |
859 | list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); | |
860 | ep->desc = NULL; | |
861 | ep->stopped = 0; | |
862 | ep->fifo_bank = 0; | |
863 | ep->ep.maxpacket = ep->maxpacket; | |
864 | // initialiser une queue par endpoint | |
865 | INIT_LIST_HEAD(&ep->queue); | |
866 | } | |
867 | } | |
868 | ||
869 | static void stop_activity(struct at91_udc *udc) | |
870 | { | |
871 | struct usb_gadget_driver *driver = udc->driver; | |
872 | int i; | |
873 | ||
874 | if (udc->gadget.speed == USB_SPEED_UNKNOWN) | |
875 | driver = NULL; | |
876 | udc->gadget.speed = USB_SPEED_UNKNOWN; | |
8b2e7668 | 877 | udc->suspended = 0; |
bae4bd84 DB |
878 | |
879 | for (i = 0; i < NUM_ENDPOINTS; i++) { | |
880 | struct at91_ep *ep = &udc->ep[i]; | |
881 | ep->stopped = 1; | |
882 | nuke(ep, -ESHUTDOWN); | |
883 | } | |
884 | if (driver) | |
885 | driver->disconnect(&udc->gadget); | |
886 | ||
887 | udc_reinit(udc); | |
888 | } | |
889 | ||
890 | static void clk_on(struct at91_udc *udc) | |
891 | { | |
892 | if (udc->clocked) | |
893 | return; | |
894 | udc->clocked = 1; | |
895 | clk_enable(udc->iclk); | |
896 | clk_enable(udc->fclk); | |
897 | } | |
898 | ||
899 | static void clk_off(struct at91_udc *udc) | |
900 | { | |
901 | if (!udc->clocked) | |
902 | return; | |
903 | udc->clocked = 0; | |
904 | udc->gadget.speed = USB_SPEED_UNKNOWN; | |
bae4bd84 | 905 | clk_disable(udc->fclk); |
8b2e7668 | 906 | clk_disable(udc->iclk); |
bae4bd84 DB |
907 | } |
908 | ||
909 | /* | |
910 | * activate/deactivate link with host; minimize power usage for | |
911 | * inactive links by cutting clocks and transceiver power. | |
912 | */ | |
913 | static void pullup(struct at91_udc *udc, int is_on) | |
914 | { | |
915 | if (!udc->enabled || !udc->vbus) | |
916 | is_on = 0; | |
917 | DBG("%sactive\n", is_on ? "" : "in"); | |
918 | if (is_on) { | |
919 | clk_on(udc); | |
920 | at91_udp_write(AT91_UDP_TXVC, 0); | |
921 | at91_set_gpio_value(udc->board.pullup_pin, 1); | |
922 | } else { | |
923 | stop_activity(udc); | |
924 | at91_udp_write(AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); | |
925 | at91_set_gpio_value(udc->board.pullup_pin, 0); | |
926 | clk_off(udc); | |
bae4bd84 DB |
927 | } |
928 | } | |
929 | ||
930 | /* vbus is here! turn everything on that's ready */ | |
931 | static int at91_vbus_session(struct usb_gadget *gadget, int is_active) | |
932 | { | |
933 | struct at91_udc *udc = to_udc(gadget); | |
934 | unsigned long flags; | |
935 | ||
936 | // VDBG("vbus %s\n", is_active ? "on" : "off"); | |
937 | local_irq_save(flags); | |
938 | udc->vbus = (is_active != 0); | |
939 | pullup(udc, is_active); | |
940 | local_irq_restore(flags); | |
941 | return 0; | |
942 | } | |
943 | ||
944 | static int at91_pullup(struct usb_gadget *gadget, int is_on) | |
945 | { | |
946 | struct at91_udc *udc = to_udc(gadget); | |
947 | unsigned long flags; | |
948 | ||
949 | local_irq_save(flags); | |
950 | udc->enabled = is_on = !!is_on; | |
951 | pullup(udc, is_on); | |
952 | local_irq_restore(flags); | |
953 | return 0; | |
954 | } | |
955 | ||
956 | static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on) | |
957 | { | |
958 | struct at91_udc *udc = to_udc(gadget); | |
959 | unsigned long flags; | |
960 | ||
961 | local_irq_save(flags); | |
962 | udc->selfpowered = (is_on != 0); | |
963 | local_irq_restore(flags); | |
964 | return 0; | |
965 | } | |
966 | ||
967 | static const struct usb_gadget_ops at91_udc_ops = { | |
968 | .get_frame = at91_get_frame, | |
969 | .wakeup = at91_wakeup, | |
970 | .set_selfpowered = at91_set_selfpowered, | |
971 | .vbus_session = at91_vbus_session, | |
972 | .pullup = at91_pullup, | |
973 | ||
974 | /* | |
975 | * VBUS-powered devices may also also want to support bigger | |
976 | * power budgets after an appropriate SET_CONFIGURATION. | |
977 | */ | |
978 | // .vbus_power = at91_vbus_power, | |
979 | }; | |
980 | ||
981 | /*-------------------------------------------------------------------------*/ | |
982 | ||
983 | static int handle_ep(struct at91_ep *ep) | |
984 | { | |
985 | struct at91_request *req; | |
986 | u32 __iomem *creg = ep->creg; | |
987 | u32 csr = __raw_readl(creg); | |
988 | ||
989 | if (!list_empty(&ep->queue)) | |
990 | req = list_entry(ep->queue.next, | |
991 | struct at91_request, queue); | |
992 | else | |
993 | req = NULL; | |
994 | ||
995 | if (ep->is_in) { | |
996 | if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) { | |
997 | csr |= CLR_FX; | |
998 | csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP); | |
999 | __raw_writel(csr, creg); | |
1000 | } | |
1001 | if (req) | |
1002 | return write_fifo(ep, req); | |
1003 | ||
1004 | } else { | |
1005 | if (csr & AT91_UDP_STALLSENT) { | |
1006 | /* STALLSENT bit == ISOERR */ | |
1007 | if (ep->is_iso && req) | |
1008 | req->req.status = -EILSEQ; | |
1009 | csr |= CLR_FX; | |
1010 | csr &= ~(SET_FX | AT91_UDP_STALLSENT); | |
1011 | __raw_writel(csr, creg); | |
1012 | csr = __raw_readl(creg); | |
1013 | } | |
1014 | if (req && (csr & RX_DATA_READY)) | |
1015 | return read_fifo(ep, req); | |
1016 | } | |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | union setup { | |
1021 | u8 raw[8]; | |
1022 | struct usb_ctrlrequest r; | |
1023 | }; | |
1024 | ||
1025 | static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr) | |
1026 | { | |
1027 | u32 __iomem *creg = ep->creg; | |
1028 | u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); | |
1029 | unsigned rxcount, i = 0; | |
1030 | u32 tmp; | |
1031 | union setup pkt; | |
1032 | int status = 0; | |
1033 | ||
1034 | /* read and ack SETUP; hard-fail for bogus packets */ | |
1035 | rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16; | |
1036 | if (likely(rxcount == 8)) { | |
1037 | while (rxcount--) | |
1038 | pkt.raw[i++] = __raw_readb(dreg); | |
1039 | if (pkt.r.bRequestType & USB_DIR_IN) { | |
1040 | csr |= AT91_UDP_DIR; | |
1041 | ep->is_in = 1; | |
1042 | } else { | |
1043 | csr &= ~AT91_UDP_DIR; | |
1044 | ep->is_in = 0; | |
1045 | } | |
1046 | } else { | |
1047 | // REVISIT this happens sometimes under load; why?? | |
1048 | ERR("SETUP len %d, csr %08x\n", rxcount, csr); | |
1049 | status = -EINVAL; | |
1050 | } | |
1051 | csr |= CLR_FX; | |
1052 | csr &= ~(SET_FX | AT91_UDP_RXSETUP); | |
1053 | __raw_writel(csr, creg); | |
1054 | udc->wait_for_addr_ack = 0; | |
1055 | udc->wait_for_config_ack = 0; | |
1056 | ep->stopped = 0; | |
1057 | if (unlikely(status != 0)) | |
1058 | goto stall; | |
1059 | ||
1060 | #define w_index le16_to_cpu(pkt.r.wIndex) | |
1061 | #define w_value le16_to_cpu(pkt.r.wValue) | |
1062 | #define w_length le16_to_cpu(pkt.r.wLength) | |
1063 | ||
1064 | VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", | |
1065 | pkt.r.bRequestType, pkt.r.bRequest, | |
1066 | w_value, w_index, w_length); | |
1067 | ||
1068 | /* | |
1069 | * A few standard requests get handled here, ones that touch | |
1070 | * hardware ... notably for device and endpoint features. | |
1071 | */ | |
1072 | udc->req_pending = 1; | |
1073 | csr = __raw_readl(creg); | |
1074 | csr |= CLR_FX; | |
1075 | csr &= ~SET_FX; | |
1076 | switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) { | |
1077 | ||
1078 | case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) | |
1079 | | USB_REQ_SET_ADDRESS: | |
1080 | __raw_writel(csr | AT91_UDP_TXPKTRDY, creg); | |
1081 | udc->addr = w_value; | |
1082 | udc->wait_for_addr_ack = 1; | |
1083 | udc->req_pending = 0; | |
1084 | /* FADDR is set later, when we ack host STATUS */ | |
1085 | return; | |
1086 | ||
1087 | case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) | |
1088 | | USB_REQ_SET_CONFIGURATION: | |
1089 | tmp = at91_udp_read(AT91_UDP_GLB_STAT) & AT91_UDP_CONFG; | |
1090 | if (pkt.r.wValue) | |
1091 | udc->wait_for_config_ack = (tmp == 0); | |
1092 | else | |
1093 | udc->wait_for_config_ack = (tmp != 0); | |
1094 | if (udc->wait_for_config_ack) | |
1095 | VDBG("wait for config\n"); | |
1096 | /* CONFG is toggled later, if gadget driver succeeds */ | |
1097 | break; | |
1098 | ||
1099 | /* | |
1100 | * Hosts may set or clear remote wakeup status, and | |
1101 | * devices may report they're VBUS powered. | |
1102 | */ | |
1103 | case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) | |
1104 | | USB_REQ_GET_STATUS: | |
1105 | tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED); | |
1106 | if (at91_udp_read(AT91_UDP_GLB_STAT) & AT91_UDP_ESR) | |
1107 | tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP); | |
1108 | PACKET("get device status\n"); | |
1109 | __raw_writeb(tmp, dreg); | |
1110 | __raw_writeb(0, dreg); | |
1111 | goto write_in; | |
1112 | /* then STATUS starts later, automatically */ | |
1113 | case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) | |
1114 | | USB_REQ_SET_FEATURE: | |
1115 | if (w_value != USB_DEVICE_REMOTE_WAKEUP) | |
1116 | goto stall; | |
1117 | tmp = at91_udp_read(AT91_UDP_GLB_STAT); | |
1118 | tmp |= AT91_UDP_ESR; | |
1119 | at91_udp_write(AT91_UDP_GLB_STAT, tmp); | |
1120 | goto succeed; | |
1121 | case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) | |
1122 | | USB_REQ_CLEAR_FEATURE: | |
1123 | if (w_value != USB_DEVICE_REMOTE_WAKEUP) | |
1124 | goto stall; | |
1125 | tmp = at91_udp_read(AT91_UDP_GLB_STAT); | |
1126 | tmp &= ~AT91_UDP_ESR; | |
1127 | at91_udp_write(AT91_UDP_GLB_STAT, tmp); | |
1128 | goto succeed; | |
1129 | ||
1130 | /* | |
1131 | * Interfaces have no feature settings; this is pretty useless. | |
1132 | * we won't even insist the interface exists... | |
1133 | */ | |
1134 | case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) | |
1135 | | USB_REQ_GET_STATUS: | |
1136 | PACKET("get interface status\n"); | |
1137 | __raw_writeb(0, dreg); | |
1138 | __raw_writeb(0, dreg); | |
1139 | goto write_in; | |
1140 | /* then STATUS starts later, automatically */ | |
1141 | case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) | |
1142 | | USB_REQ_SET_FEATURE: | |
1143 | case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) | |
1144 | | USB_REQ_CLEAR_FEATURE: | |
1145 | goto stall; | |
1146 | ||
1147 | /* | |
1148 | * Hosts may clear bulk/intr endpoint halt after the gadget | |
1149 | * driver sets it (not widely used); or set it (for testing) | |
1150 | */ | |
1151 | case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) | |
1152 | | USB_REQ_GET_STATUS: | |
1153 | tmp = w_index & USB_ENDPOINT_NUMBER_MASK; | |
1154 | ep = &udc->ep[tmp]; | |
1155 | if (tmp > NUM_ENDPOINTS || (tmp && !ep->desc)) | |
1156 | goto stall; | |
1157 | ||
1158 | if (tmp) { | |
1159 | if ((w_index & USB_DIR_IN)) { | |
1160 | if (!ep->is_in) | |
1161 | goto stall; | |
1162 | } else if (ep->is_in) | |
1163 | goto stall; | |
1164 | } | |
1165 | PACKET("get %s status\n", ep->ep.name); | |
1166 | if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL) | |
1167 | tmp = (1 << USB_ENDPOINT_HALT); | |
1168 | else | |
1169 | tmp = 0; | |
1170 | __raw_writeb(tmp, dreg); | |
1171 | __raw_writeb(0, dreg); | |
1172 | goto write_in; | |
1173 | /* then STATUS starts later, automatically */ | |
1174 | case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) | |
1175 | | USB_REQ_SET_FEATURE: | |
1176 | tmp = w_index & USB_ENDPOINT_NUMBER_MASK; | |
1177 | ep = &udc->ep[tmp]; | |
1178 | if (w_value != USB_ENDPOINT_HALT || tmp > NUM_ENDPOINTS) | |
1179 | goto stall; | |
1180 | if (!ep->desc || ep->is_iso) | |
1181 | goto stall; | |
1182 | if ((w_index & USB_DIR_IN)) { | |
1183 | if (!ep->is_in) | |
1184 | goto stall; | |
1185 | } else if (ep->is_in) | |
1186 | goto stall; | |
1187 | ||
1188 | tmp = __raw_readl(ep->creg); | |
1189 | tmp &= ~SET_FX; | |
1190 | tmp |= CLR_FX | AT91_UDP_FORCESTALL; | |
1191 | __raw_writel(tmp, ep->creg); | |
1192 | goto succeed; | |
1193 | case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) | |
1194 | | USB_REQ_CLEAR_FEATURE: | |
1195 | tmp = w_index & USB_ENDPOINT_NUMBER_MASK; | |
1196 | ep = &udc->ep[tmp]; | |
1197 | if (w_value != USB_ENDPOINT_HALT || tmp > NUM_ENDPOINTS) | |
1198 | goto stall; | |
1199 | if (tmp == 0) | |
1200 | goto succeed; | |
1201 | if (!ep->desc || ep->is_iso) | |
1202 | goto stall; | |
1203 | if ((w_index & USB_DIR_IN)) { | |
1204 | if (!ep->is_in) | |
1205 | goto stall; | |
1206 | } else if (ep->is_in) | |
1207 | goto stall; | |
1208 | ||
1209 | at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); | |
1210 | at91_udp_write(AT91_UDP_RST_EP, 0); | |
1211 | tmp = __raw_readl(ep->creg); | |
1212 | tmp |= CLR_FX; | |
1213 | tmp &= ~(SET_FX | AT91_UDP_FORCESTALL); | |
1214 | __raw_writel(tmp, ep->creg); | |
1215 | if (!list_empty(&ep->queue)) | |
1216 | handle_ep(ep); | |
1217 | goto succeed; | |
1218 | } | |
1219 | ||
1220 | #undef w_value | |
1221 | #undef w_index | |
1222 | #undef w_length | |
1223 | ||
1224 | /* pass request up to the gadget driver */ | |
1225 | status = udc->driver->setup(&udc->gadget, &pkt.r); | |
1226 | if (status < 0) { | |
1227 | stall: | |
1228 | VDBG("req %02x.%02x protocol STALL; stat %d\n", | |
1229 | pkt.r.bRequestType, pkt.r.bRequest, status); | |
1230 | csr |= AT91_UDP_FORCESTALL; | |
1231 | __raw_writel(csr, creg); | |
1232 | udc->req_pending = 0; | |
1233 | } | |
1234 | return; | |
1235 | ||
1236 | succeed: | |
1237 | /* immediate successful (IN) STATUS after zero length DATA */ | |
1238 | PACKET("ep0 in/status\n"); | |
1239 | write_in: | |
1240 | csr |= AT91_UDP_TXPKTRDY; | |
1241 | __raw_writel(csr, creg); | |
1242 | udc->req_pending = 0; | |
1243 | return; | |
1244 | } | |
1245 | ||
1246 | static void handle_ep0(struct at91_udc *udc) | |
1247 | { | |
1248 | struct at91_ep *ep0 = &udc->ep[0]; | |
1249 | u32 __iomem *creg = ep0->creg; | |
1250 | u32 csr = __raw_readl(creg); | |
1251 | struct at91_request *req; | |
1252 | ||
1253 | if (unlikely(csr & AT91_UDP_STALLSENT)) { | |
1254 | nuke(ep0, -EPROTO); | |
1255 | udc->req_pending = 0; | |
1256 | csr |= CLR_FX; | |
1257 | csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL); | |
1258 | __raw_writel(csr, creg); | |
1259 | VDBG("ep0 stalled\n"); | |
1260 | csr = __raw_readl(creg); | |
1261 | } | |
1262 | if (csr & AT91_UDP_RXSETUP) { | |
1263 | nuke(ep0, 0); | |
1264 | udc->req_pending = 0; | |
1265 | handle_setup(udc, ep0, csr); | |
1266 | return; | |
1267 | } | |
1268 | ||
1269 | if (list_empty(&ep0->queue)) | |
1270 | req = NULL; | |
1271 | else | |
1272 | req = list_entry(ep0->queue.next, struct at91_request, queue); | |
1273 | ||
1274 | /* host ACKed an IN packet that we sent */ | |
1275 | if (csr & AT91_UDP_TXCOMP) { | |
1276 | csr |= CLR_FX; | |
1277 | csr &= ~(SET_FX | AT91_UDP_TXCOMP); | |
1278 | ||
1279 | /* write more IN DATA? */ | |
1280 | if (req && ep0->is_in) { | |
1281 | if (handle_ep(ep0)) | |
1282 | udc->req_pending = 0; | |
1283 | ||
1284 | /* | |
1285 | * Ack after: | |
1286 | * - last IN DATA packet (including GET_STATUS) | |
1287 | * - IN/STATUS for OUT DATA | |
1288 | * - IN/STATUS for any zero-length DATA stage | |
1289 | * except for the IN DATA case, the host should send | |
1290 | * an OUT status later, which we'll ack. | |
1291 | */ | |
1292 | } else { | |
1293 | udc->req_pending = 0; | |
1294 | __raw_writel(csr, creg); | |
1295 | ||
1296 | /* | |
1297 | * SET_ADDRESS takes effect only after the STATUS | |
1298 | * (to the original address) gets acked. | |
1299 | */ | |
1300 | if (udc->wait_for_addr_ack) { | |
1301 | u32 tmp; | |
1302 | ||
8b2e7668 DB |
1303 | at91_udp_write(AT91_UDP_FADDR, |
1304 | AT91_UDP_FEN | udc->addr); | |
bae4bd84 DB |
1305 | tmp = at91_udp_read(AT91_UDP_GLB_STAT); |
1306 | tmp &= ~AT91_UDP_FADDEN; | |
1307 | if (udc->addr) | |
1308 | tmp |= AT91_UDP_FADDEN; | |
1309 | at91_udp_write(AT91_UDP_GLB_STAT, tmp); | |
1310 | ||
1311 | udc->wait_for_addr_ack = 0; | |
1312 | VDBG("address %d\n", udc->addr); | |
1313 | } | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | /* OUT packet arrived ... */ | |
1318 | else if (csr & AT91_UDP_RX_DATA_BK0) { | |
1319 | csr |= CLR_FX; | |
1320 | csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); | |
1321 | ||
1322 | /* OUT DATA stage */ | |
1323 | if (!ep0->is_in) { | |
1324 | if (req) { | |
1325 | if (handle_ep(ep0)) { | |
1326 | /* send IN/STATUS */ | |
1327 | PACKET("ep0 in/status\n"); | |
1328 | csr = __raw_readl(creg); | |
1329 | csr &= ~SET_FX; | |
1330 | csr |= CLR_FX | AT91_UDP_TXPKTRDY; | |
1331 | __raw_writel(csr, creg); | |
1332 | udc->req_pending = 0; | |
1333 | } | |
1334 | } else if (udc->req_pending) { | |
1335 | /* | |
1336 | * AT91 hardware has a hard time with this | |
1337 | * "deferred response" mode for control-OUT | |
1338 | * transfers. (For control-IN it's fine.) | |
1339 | * | |
1340 | * The normal solution leaves OUT data in the | |
1341 | * fifo until the gadget driver is ready. | |
1342 | * We couldn't do that here without disabling | |
1343 | * the IRQ that tells about SETUP packets, | |
1344 | * e.g. when the host gets impatient... | |
1345 | * | |
1346 | * Working around it by copying into a buffer | |
1347 | * would almost be a non-deferred response, | |
1348 | * except that it wouldn't permit reliable | |
1349 | * stalling of the request. Instead, demand | |
1350 | * that gadget drivers not use this mode. | |
1351 | */ | |
1352 | DBG("no control-OUT deferred responses!\n"); | |
1353 | __raw_writel(csr | AT91_UDP_FORCESTALL, creg); | |
1354 | udc->req_pending = 0; | |
1355 | } | |
1356 | ||
1357 | /* STATUS stage for control-IN; ack. */ | |
1358 | } else { | |
1359 | PACKET("ep0 out/status ACK\n"); | |
1360 | __raw_writel(csr, creg); | |
1361 | ||
1362 | /* "early" status stage */ | |
1363 | if (req) | |
1364 | done(ep0, req, 0); | |
1365 | } | |
1366 | } | |
1367 | } | |
1368 | ||
7d12e780 | 1369 | static irqreturn_t at91_udc_irq (int irq, void *_udc) |
bae4bd84 DB |
1370 | { |
1371 | struct at91_udc *udc = _udc; | |
1372 | u32 rescans = 5; | |
1373 | ||
1374 | while (rescans--) { | |
8b2e7668 | 1375 | u32 status; |
bae4bd84 | 1376 | |
8b2e7668 DB |
1377 | status = at91_udp_read(AT91_UDP_ISR) |
1378 | & at91_udp_read(AT91_UDP_IMR); | |
bae4bd84 DB |
1379 | if (!status) |
1380 | break; | |
1381 | ||
1382 | /* USB reset irq: not maskable */ | |
1383 | if (status & AT91_UDP_ENDBUSRES) { | |
1384 | at91_udp_write(AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS); | |
1385 | at91_udp_write(AT91_UDP_IER, MINIMUS_INTERRUPTUS); | |
1386 | /* Atmel code clears this irq twice */ | |
1387 | at91_udp_write(AT91_UDP_ICR, AT91_UDP_ENDBUSRES); | |
1388 | at91_udp_write(AT91_UDP_ICR, AT91_UDP_ENDBUSRES); | |
1389 | VDBG("end bus reset\n"); | |
1390 | udc->addr = 0; | |
1391 | stop_activity(udc); | |
1392 | ||
1393 | /* enable ep0 */ | |
8b2e7668 DB |
1394 | at91_udp_write(AT91_UDP_CSR(0), |
1395 | AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); | |
bae4bd84 DB |
1396 | udc->gadget.speed = USB_SPEED_FULL; |
1397 | udc->suspended = 0; | |
1398 | at91_udp_write(AT91_UDP_IER, AT91_UDP_EP(0)); | |
1399 | ||
1400 | /* | |
1401 | * NOTE: this driver keeps clocks off unless the | |
8b2e7668 DB |
1402 | * USB host is present. That saves power, but for |
1403 | * boards that don't support VBUS detection, both | |
1404 | * clocks need to be active most of the time. | |
bae4bd84 DB |
1405 | */ |
1406 | ||
1407 | /* host initiated suspend (3+ms bus idle) */ | |
1408 | } else if (status & AT91_UDP_RXSUSP) { | |
1409 | at91_udp_write(AT91_UDP_IDR, AT91_UDP_RXSUSP); | |
1410 | at91_udp_write(AT91_UDP_IER, AT91_UDP_RXRSM); | |
1411 | at91_udp_write(AT91_UDP_ICR, AT91_UDP_RXSUSP); | |
1412 | // VDBG("bus suspend\n"); | |
1413 | if (udc->suspended) | |
1414 | continue; | |
1415 | udc->suspended = 1; | |
1416 | ||
1417 | /* | |
1418 | * NOTE: when suspending a VBUS-powered device, the | |
1419 | * gadget driver should switch into slow clock mode | |
1420 | * and then into standby to avoid drawing more than | |
1421 | * 500uA power (2500uA for some high-power configs). | |
1422 | */ | |
1423 | if (udc->driver && udc->driver->suspend) | |
1424 | udc->driver->suspend(&udc->gadget); | |
1425 | ||
1426 | /* host initiated resume */ | |
1427 | } else if (status & AT91_UDP_RXRSM) { | |
1428 | at91_udp_write(AT91_UDP_IDR, AT91_UDP_RXRSM); | |
1429 | at91_udp_write(AT91_UDP_IER, AT91_UDP_RXSUSP); | |
1430 | at91_udp_write(AT91_UDP_ICR, AT91_UDP_RXRSM); | |
1431 | // VDBG("bus resume\n"); | |
1432 | if (!udc->suspended) | |
1433 | continue; | |
1434 | udc->suspended = 0; | |
1435 | ||
1436 | /* | |
1437 | * NOTE: for a VBUS-powered device, the gadget driver | |
1438 | * would normally want to switch out of slow clock | |
1439 | * mode into normal mode. | |
1440 | */ | |
1441 | if (udc->driver && udc->driver->resume) | |
1442 | udc->driver->resume(&udc->gadget); | |
1443 | ||
1444 | /* endpoint IRQs are cleared by handling them */ | |
1445 | } else { | |
1446 | int i; | |
1447 | unsigned mask = 1; | |
1448 | struct at91_ep *ep = &udc->ep[1]; | |
1449 | ||
1450 | if (status & mask) | |
1451 | handle_ep0(udc); | |
1452 | for (i = 1; i < NUM_ENDPOINTS; i++) { | |
1453 | mask <<= 1; | |
1454 | if (status & mask) | |
1455 | handle_ep(ep); | |
1456 | ep++; | |
1457 | } | |
1458 | } | |
1459 | } | |
1460 | ||
1461 | return IRQ_HANDLED; | |
1462 | } | |
1463 | ||
1464 | /*-------------------------------------------------------------------------*/ | |
1465 | ||
8b2e7668 DB |
1466 | static void nop_release(struct device *dev) |
1467 | { | |
1468 | /* nothing to free */ | |
1469 | } | |
1470 | ||
bae4bd84 DB |
1471 | static struct at91_udc controller = { |
1472 | .gadget = { | |
8b2e7668 DB |
1473 | .ops = &at91_udc_ops, |
1474 | .ep0 = &controller.ep[0].ep, | |
1475 | .name = driver_name, | |
1476 | .dev = { | |
1477 | .bus_id = "gadget", | |
1478 | .release = nop_release, | |
bae4bd84 DB |
1479 | } |
1480 | }, | |
1481 | .ep[0] = { | |
1482 | .ep = { | |
1483 | .name = ep0name, | |
1484 | .ops = &at91_ep_ops, | |
1485 | }, | |
1486 | .udc = &controller, | |
1487 | .maxpacket = 8, | |
8b2e7668 DB |
1488 | .creg = (void __iomem *)(AT91_VA_BASE_UDP |
1489 | + AT91_UDP_CSR(0)), | |
bae4bd84 DB |
1490 | .int_mask = 1 << 0, |
1491 | }, | |
1492 | .ep[1] = { | |
1493 | .ep = { | |
1494 | .name = "ep1", | |
1495 | .ops = &at91_ep_ops, | |
1496 | }, | |
1497 | .udc = &controller, | |
1498 | .is_pingpong = 1, | |
1499 | .maxpacket = 64, | |
8b2e7668 DB |
1500 | .creg = (void __iomem *)(AT91_VA_BASE_UDP |
1501 | + AT91_UDP_CSR(1)), | |
bae4bd84 DB |
1502 | .int_mask = 1 << 1, |
1503 | }, | |
1504 | .ep[2] = { | |
1505 | .ep = { | |
1506 | .name = "ep2", | |
1507 | .ops = &at91_ep_ops, | |
1508 | }, | |
1509 | .udc = &controller, | |
1510 | .is_pingpong = 1, | |
1511 | .maxpacket = 64, | |
8b2e7668 DB |
1512 | .creg = (void __iomem *)(AT91_VA_BASE_UDP |
1513 | + AT91_UDP_CSR(2)), | |
bae4bd84 DB |
1514 | .int_mask = 1 << 2, |
1515 | }, | |
1516 | .ep[3] = { | |
1517 | .ep = { | |
1518 | /* could actually do bulk too */ | |
1519 | .name = "ep3-int", | |
1520 | .ops = &at91_ep_ops, | |
1521 | }, | |
1522 | .udc = &controller, | |
1523 | .maxpacket = 8, | |
8b2e7668 DB |
1524 | .creg = (void __iomem *)(AT91_VA_BASE_UDP |
1525 | + AT91_UDP_CSR(3)), | |
bae4bd84 DB |
1526 | .int_mask = 1 << 3, |
1527 | }, | |
1528 | .ep[4] = { | |
1529 | .ep = { | |
1530 | .name = "ep4", | |
1531 | .ops = &at91_ep_ops, | |
1532 | }, | |
1533 | .udc = &controller, | |
1534 | .is_pingpong = 1, | |
1535 | .maxpacket = 256, | |
8b2e7668 DB |
1536 | .creg = (void __iomem *)(AT91_VA_BASE_UDP |
1537 | + AT91_UDP_CSR(4)), | |
bae4bd84 DB |
1538 | .int_mask = 1 << 4, |
1539 | }, | |
1540 | .ep[5] = { | |
1541 | .ep = { | |
1542 | .name = "ep5", | |
1543 | .ops = &at91_ep_ops, | |
1544 | }, | |
1545 | .udc = &controller, | |
1546 | .is_pingpong = 1, | |
1547 | .maxpacket = 256, | |
8b2e7668 DB |
1548 | .creg = (void __iomem *)(AT91_VA_BASE_UDP |
1549 | + AT91_UDP_CSR(5)), | |
bae4bd84 DB |
1550 | .int_mask = 1 << 5, |
1551 | }, | |
8b2e7668 | 1552 | /* ep6 and ep7 are also reserved (custom silicon might use them) */ |
bae4bd84 DB |
1553 | }; |
1554 | ||
7d12e780 | 1555 | static irqreturn_t at91_vbus_irq(int irq, void *_udc) |
bae4bd84 DB |
1556 | { |
1557 | struct at91_udc *udc = _udc; | |
1558 | unsigned value; | |
1559 | ||
1560 | /* vbus needs at least brief debouncing */ | |
1561 | udelay(10); | |
1562 | value = at91_get_gpio_value(udc->board.vbus_pin); | |
1563 | if (value != udc->vbus) | |
1564 | at91_vbus_session(&udc->gadget, value); | |
1565 | ||
1566 | return IRQ_HANDLED; | |
1567 | } | |
1568 | ||
1569 | int usb_gadget_register_driver (struct usb_gadget_driver *driver) | |
1570 | { | |
1571 | struct at91_udc *udc = &controller; | |
1572 | int retval; | |
1573 | ||
1574 | if (!driver | |
1575 | || driver->speed != USB_SPEED_FULL | |
1576 | || !driver->bind | |
1577 | || !driver->unbind | |
1578 | || !driver->setup) { | |
1579 | DBG("bad parameter.\n"); | |
1580 | return -EINVAL; | |
1581 | } | |
1582 | ||
1583 | if (udc->driver) { | |
1584 | DBG("UDC already has a gadget driver\n"); | |
1585 | return -EBUSY; | |
1586 | } | |
1587 | ||
1588 | udc->driver = driver; | |
1589 | udc->gadget.dev.driver = &driver->driver; | |
1590 | udc->gadget.dev.driver_data = &driver->driver; | |
1591 | udc->enabled = 1; | |
1592 | udc->selfpowered = 1; | |
1593 | ||
1594 | retval = driver->bind(&udc->gadget); | |
1595 | if (retval) { | |
1596 | DBG("driver->bind() returned %d\n", retval); | |
1597 | udc->driver = NULL; | |
1598 | return retval; | |
1599 | } | |
1600 | ||
1601 | local_irq_disable(); | |
1602 | pullup(udc, 1); | |
1603 | local_irq_enable(); | |
1604 | ||
1605 | DBG("bound to %s\n", driver->driver.name); | |
1606 | return 0; | |
1607 | } | |
1608 | EXPORT_SYMBOL (usb_gadget_register_driver); | |
1609 | ||
1610 | int usb_gadget_unregister_driver (struct usb_gadget_driver *driver) | |
1611 | { | |
1612 | struct at91_udc *udc = &controller; | |
1613 | ||
1614 | if (!driver || driver != udc->driver) | |
1615 | return -EINVAL; | |
1616 | ||
1617 | local_irq_disable(); | |
1618 | udc->enabled = 0; | |
8b2e7668 | 1619 | at91_udp_write(AT91_UDP_IDR, ~0); |
bae4bd84 DB |
1620 | pullup(udc, 0); |
1621 | local_irq_enable(); | |
1622 | ||
1623 | driver->unbind(&udc->gadget); | |
1624 | udc->driver = NULL; | |
1625 | ||
1626 | DBG("unbound from %s\n", driver->driver.name); | |
1627 | return 0; | |
1628 | } | |
1629 | EXPORT_SYMBOL (usb_gadget_unregister_driver); | |
1630 | ||
1631 | /*-------------------------------------------------------------------------*/ | |
1632 | ||
1633 | static void at91udc_shutdown(struct platform_device *dev) | |
1634 | { | |
1635 | /* force disconnect on reboot */ | |
1636 | pullup(platform_get_drvdata(dev), 0); | |
1637 | } | |
1638 | ||
1639 | static int __devinit at91udc_probe(struct platform_device *pdev) | |
1640 | { | |
1641 | struct device *dev = &pdev->dev; | |
1642 | struct at91_udc *udc; | |
1643 | int retval; | |
1644 | ||
1645 | if (!dev->platform_data) { | |
1646 | /* small (so we copy it) but critical! */ | |
1647 | DBG("missing platform_data\n"); | |
1648 | return -ENODEV; | |
1649 | } | |
1650 | ||
8b2e7668 DB |
1651 | if (pdev->num_resources != 2) { |
1652 | DBG("invalid num_resources"); | |
1653 | return -ENODEV; | |
1654 | } | |
1655 | if ((pdev->resource[0].flags != IORESOURCE_MEM) | |
1656 | || (pdev->resource[1].flags != IORESOURCE_IRQ)) { | |
1657 | DBG("invalid resource type"); | |
1658 | return -ENODEV; | |
1659 | } | |
1660 | ||
72729910 | 1661 | if (!request_mem_region(AT91RM9200_BASE_UDP, SZ_16K, driver_name)) { |
bae4bd84 DB |
1662 | DBG("someone's using UDC memory\n"); |
1663 | return -EBUSY; | |
1664 | } | |
1665 | ||
1666 | /* init software state */ | |
1667 | udc = &controller; | |
1668 | udc->gadget.dev.parent = dev; | |
1669 | udc->board = *(struct at91_udc_data *) dev->platform_data; | |
1670 | udc->pdev = pdev; | |
1671 | udc_reinit(udc); | |
1672 | udc->enabled = 0; | |
1673 | ||
1674 | /* get interface and function clocks */ | |
1675 | udc->iclk = clk_get(dev, "udc_clk"); | |
1676 | udc->fclk = clk_get(dev, "udpck"); | |
1677 | if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) { | |
1678 | DBG("clocks missing\n"); | |
1679 | return -ENODEV; | |
1680 | } | |
1681 | ||
1682 | retval = device_register(&udc->gadget.dev); | |
1683 | if (retval < 0) | |
1684 | goto fail0; | |
1685 | ||
8b2e7668 DB |
1686 | /* don't do anything until we have both gadget driver and VBUS */ |
1687 | clk_enable(udc->iclk); | |
1688 | at91_udp_write(AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); | |
1689 | at91_udp_write(AT91_UDP_IDR, 0xffffffff); | |
1690 | clk_disable(udc->iclk); | |
bae4bd84 DB |
1691 | |
1692 | /* request UDC and maybe VBUS irqs */ | |
8b2e7668 DB |
1693 | udc->udp_irq = platform_get_irq(pdev, 0); |
1694 | if (request_irq(udc->udp_irq, at91_udc_irq, | |
1695 | IRQF_DISABLED, driver_name, udc)) { | |
1696 | DBG("request irq %d failed\n", udc->udp_irq); | |
bae4bd84 DB |
1697 | retval = -EBUSY; |
1698 | goto fail1; | |
1699 | } | |
1700 | if (udc->board.vbus_pin > 0) { | |
8b2e7668 DB |
1701 | if (request_irq(udc->board.vbus_pin, at91_vbus_irq, |
1702 | IRQF_DISABLED, driver_name, udc)) { | |
1703 | DBG("request vbus irq %d failed\n", | |
1704 | udc->board.vbus_pin); | |
1705 | free_irq(udc->udp_irq, udc); | |
bae4bd84 DB |
1706 | retval = -EBUSY; |
1707 | goto fail1; | |
1708 | } | |
1709 | } else { | |
1710 | DBG("no VBUS detection, assuming always-on\n"); | |
1711 | udc->vbus = 1; | |
1712 | } | |
1713 | dev_set_drvdata(dev, udc); | |
8b2e7668 | 1714 | device_init_wakeup(dev, 1); |
bae4bd84 DB |
1715 | create_debug_file(udc); |
1716 | ||
1717 | INFO("%s version %s\n", driver_name, DRIVER_VERSION); | |
1718 | return 0; | |
1719 | ||
1720 | fail1: | |
1721 | device_unregister(&udc->gadget.dev); | |
1722 | fail0: | |
72729910 | 1723 | release_mem_region(AT91RM9200_BASE_UDP, SZ_16K); |
bae4bd84 DB |
1724 | DBG("%s probe failed, %d\n", driver_name, retval); |
1725 | return retval; | |
1726 | } | |
1727 | ||
8b2e7668 | 1728 | static int __devexit at91udc_remove(struct platform_device *pdev) |
bae4bd84 | 1729 | { |
8b2e7668 | 1730 | struct at91_udc *udc = platform_get_drvdata(pdev); |
bae4bd84 DB |
1731 | |
1732 | DBG("remove\n"); | |
1733 | ||
1734 | pullup(udc, 0); | |
1735 | ||
1736 | if (udc->driver != 0) | |
1737 | usb_gadget_unregister_driver(udc->driver); | |
1738 | ||
8b2e7668 | 1739 | device_init_wakeup(&pdev->dev, 0); |
bae4bd84 DB |
1740 | remove_debug_file(udc); |
1741 | if (udc->board.vbus_pin > 0) | |
1742 | free_irq(udc->board.vbus_pin, udc); | |
8b2e7668 | 1743 | free_irq(udc->udp_irq, udc); |
bae4bd84 | 1744 | device_unregister(&udc->gadget.dev); |
72729910 | 1745 | release_mem_region(AT91RM9200_BASE_UDP, SZ_16K); |
bae4bd84 DB |
1746 | |
1747 | clk_put(udc->iclk); | |
1748 | clk_put(udc->fclk); | |
1749 | ||
1750 | return 0; | |
1751 | } | |
1752 | ||
1753 | #ifdef CONFIG_PM | |
8b2e7668 | 1754 | static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg) |
bae4bd84 | 1755 | { |
8b2e7668 DB |
1756 | struct at91_udc *udc = platform_get_drvdata(pdev); |
1757 | int wake = udc->driver && device_may_wakeup(&pdev->dev); | |
bae4bd84 | 1758 | |
8b2e7668 DB |
1759 | /* Unless we can act normally to the host (letting it wake us up |
1760 | * whenever it has work for us) force disconnect. Wakeup requires | |
1761 | * PLLB for USB events (signaling for reset, wakeup, or incoming | |
1762 | * tokens) and VBUS irqs (on systems which support them). | |
bae4bd84 | 1763 | */ |
8b2e7668 DB |
1764 | if ((!udc->suspended && udc->addr) |
1765 | || !wake | |
1766 | || at91_suspend_entering_slow_clock()) { | |
bae4bd84 | 1767 | pullup(udc, 0); |
8b2e7668 DB |
1768 | disable_irq_wake(udc->udp_irq); |
1769 | } else | |
1770 | enable_irq_wake(udc->udp_irq); | |
1771 | ||
1772 | if (udc->board.vbus_pin > 0) { | |
1773 | if (wake) | |
1774 | enable_irq_wake(udc->board.vbus_pin); | |
1775 | else | |
1776 | disable_irq_wake(udc->board.vbus_pin); | |
1777 | } | |
bae4bd84 DB |
1778 | return 0; |
1779 | } | |
1780 | ||
8b2e7668 | 1781 | static int at91udc_resume(struct platform_device *pdev) |
bae4bd84 | 1782 | { |
8b2e7668 | 1783 | struct at91_udc *udc = platform_get_drvdata(pdev); |
bae4bd84 DB |
1784 | |
1785 | /* maybe reconnect to host; if so, clocks on */ | |
1786 | pullup(udc, 1); | |
1787 | return 0; | |
1788 | } | |
1789 | #else | |
1790 | #define at91udc_suspend NULL | |
1791 | #define at91udc_resume NULL | |
1792 | #endif | |
1793 | ||
1794 | static struct platform_driver at91_udc = { | |
1795 | .probe = at91udc_probe, | |
1796 | .remove = __devexit_p(at91udc_remove), | |
1797 | .shutdown = at91udc_shutdown, | |
1798 | .suspend = at91udc_suspend, | |
8b2e7668 | 1799 | .resume = at91udc_resume, |
bae4bd84 DB |
1800 | .driver = { |
1801 | .name = (char *) driver_name, | |
1802 | .owner = THIS_MODULE, | |
1803 | }, | |
1804 | }; | |
1805 | ||
1806 | static int __devinit udc_init_module(void) | |
1807 | { | |
1808 | return platform_driver_register(&at91_udc); | |
1809 | } | |
1810 | module_init(udc_init_module); | |
1811 | ||
1812 | static void __devexit udc_exit_module(void) | |
1813 | { | |
1814 | platform_driver_unregister(&at91_udc); | |
1815 | } | |
1816 | module_exit(udc_exit_module); | |
1817 | ||
8b2e7668 | 1818 | MODULE_DESCRIPTION("AT91 udc driver"); |
bae4bd84 DB |
1819 | MODULE_AUTHOR("Thomas Rathbone, David Brownell"); |
1820 | MODULE_LICENSE("GPL"); |