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Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / drivers / usb / gadget / udc / atmel_usba_udc.c
blobf92f5aff0dd5e8ece600cc44b5ba6168e3f1bb81
1 /*
2 * Driver for the Atmel USBA high speed USB device controller
3 *
4 * Copyright (C) 2005-2007 Atmel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10 #include <linux/clk.h>
11 #include <linux/clk/at91_pmc.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/io.h>
16 #include <linux/slab.h>
17 #include <linux/device.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/list.h>
20 #include <linux/platform_device.h>
21 #include <linux/usb/ch9.h>
22 #include <linux/usb/gadget.h>
23 #include <linux/usb/atmel_usba_udc.h>
24 #include <linux/delay.h>
25 #include <linux/of.h>
26 #include <linux/of_gpio.h>
27
28 #include <asm/gpio.h>
29
30 #include "atmel_usba_udc.h"
31
32 #ifdef CONFIG_USB_GADGET_DEBUG_FS
33 #include <linux/debugfs.h>
34 #include <linux/uaccess.h>
35
36 static int queue_dbg_open(struct inode *inode, struct file *file)
37 {
38 struct usba_ep *ep = inode->i_private;
39 struct usba_request *req, *req_copy;
40 struct list_head *queue_data;
41
42 queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
43 if (!queue_data)
44 return -ENOMEM;
45 INIT_LIST_HEAD(queue_data);
46
47 spin_lock_irq(&ep->udc->lock);
48 list_for_each_entry(req, &ep->queue, queue) {
49 req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
50 if (!req_copy)
51 goto fail;
52 list_add_tail(&req_copy->queue, queue_data);
53 }
54 spin_unlock_irq(&ep->udc->lock);
55
56 file->private_data = queue_data;
57 return 0;
58
59 fail:
60 spin_unlock_irq(&ep->udc->lock);
61 list_for_each_entry_safe(req, req_copy, queue_data, queue) {
62 list_del(&req->queue);
63 kfree(req);
64 }
65 kfree(queue_data);
66 return -ENOMEM;
67 }
68
69 /*
70 * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
71 *
72 * b: buffer address
73 * l: buffer length
74 * I/i: interrupt/no interrupt
75 * Z/z: zero/no zero
76 * S/s: short ok/short not ok
77 * s: status
78 * n: nr_packets
79 * F/f: submitted/not submitted to FIFO
80 * D/d: using/not using DMA
81 * L/l: last transaction/not last transaction
82 */
83 static ssize_t queue_dbg_read(struct file *file, char __user *buf,
84 size_t nbytes, loff_t *ppos)
85 {
86 struct list_head *queue = file->private_data;
87 struct usba_request *req, *tmp_req;
88 size_t len, remaining, actual = 0;
89 char tmpbuf[38];
90
91 if (!access_ok(VERIFY_WRITE, buf, nbytes))
92 return -EFAULT;
93
94 mutex_lock(&file_inode(file)->i_mutex);
95 list_for_each_entry_safe(req, tmp_req, queue, queue) {
96 len = snprintf(tmpbuf, sizeof(tmpbuf),
97 "%8p %08x %c%c%c %5d %c%c%c\n",
98 req->req.buf, req->req.length,
99 req->req.no_interrupt ? 'i' : 'I',
100 req->req.zero ? 'Z' : 'z',
101 req->req.short_not_ok ? 's' : 'S',
102 req->req.status,
103 req->submitted ? 'F' : 'f',
104 req->using_dma ? 'D' : 'd',
105 req->last_transaction ? 'L' : 'l');
106 len = min(len, sizeof(tmpbuf));
107 if (len > nbytes)
108 break;
109
110 list_del(&req->queue);
111 kfree(req);
112
113 remaining = __copy_to_user(buf, tmpbuf, len);
114 actual += len - remaining;
115 if (remaining)
116 break;
117
118 nbytes -= len;
119 buf += len;
120 }
121 mutex_unlock(&file_inode(file)->i_mutex);
122
123 return actual;
124 }
125
126 static int queue_dbg_release(struct inode *inode, struct file *file)
127 {
128 struct list_head *queue_data = file->private_data;
129 struct usba_request *req, *tmp_req;
130
131 list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
132 list_del(&req->queue);
133 kfree(req);
134 }
135 kfree(queue_data);
136 return 0;
137 }
138
139 static int regs_dbg_open(struct inode *inode, struct file *file)
140 {
141 struct usba_udc *udc;
142 unsigned int i;
143 u32 *data;
144 int ret = -ENOMEM;
145
146 mutex_lock(&inode->i_mutex);
147 udc = inode->i_private;
148 data = kmalloc(inode->i_size, GFP_KERNEL);
149 if (!data)
150 goto out;
151
152 spin_lock_irq(&udc->lock);
153 for (i = 0; i < inode->i_size / 4; i++)
154 data[i] = usba_io_readl(udc->regs + i * 4);
155 spin_unlock_irq(&udc->lock);
156
157 file->private_data = data;
158 ret = 0;
159
160 out:
161 mutex_unlock(&inode->i_mutex);
162
163 return ret;
164 }
165
166 static ssize_t regs_dbg_read(struct file *file, char __user *buf,
167 size_t nbytes, loff_t *ppos)
168 {
169 struct inode *inode = file_inode(file);
170 int ret;
171
172 mutex_lock(&inode->i_mutex);
173 ret = simple_read_from_buffer(buf, nbytes, ppos,
174 file->private_data,
175 file_inode(file)->i_size);
176 mutex_unlock(&inode->i_mutex);
177
178 return ret;
179 }
180
181 static int regs_dbg_release(struct inode *inode, struct file *file)
182 {
183 kfree(file->private_data);
184 return 0;
185 }
186
187 const struct file_operations queue_dbg_fops = {
188 .owner = THIS_MODULE,
189 .open = queue_dbg_open,
190 .llseek = no_llseek,
191 .read = queue_dbg_read,
192 .release = queue_dbg_release,
193 };
194
195 const struct file_operations regs_dbg_fops = {
196 .owner = THIS_MODULE,
197 .open = regs_dbg_open,
198 .llseek = generic_file_llseek,
199 .read = regs_dbg_read,
200 .release = regs_dbg_release,
201 };
202
203 static void usba_ep_init_debugfs(struct usba_udc *udc,
204 struct usba_ep *ep)
205 {
206 struct dentry *ep_root;
207
208 ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
209 if (!ep_root)
210 goto err_root;
211 ep->debugfs_dir = ep_root;
212
213 ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
214 ep, &queue_dbg_fops);
215 if (!ep->debugfs_queue)
216 goto err_queue;
217
218 if (ep->can_dma) {
219 ep->debugfs_dma_status
220 = debugfs_create_u32("dma_status", 0400, ep_root,
221 &ep->last_dma_status);
222 if (!ep->debugfs_dma_status)
223 goto err_dma_status;
224 }
225 if (ep_is_control(ep)) {
226 ep->debugfs_state
227 = debugfs_create_u32("state", 0400, ep_root,
228 &ep->state);
229 if (!ep->debugfs_state)
230 goto err_state;
231 }
232
233 return;
234
235 err_state:
236 if (ep->can_dma)
237 debugfs_remove(ep->debugfs_dma_status);
238 err_dma_status:
239 debugfs_remove(ep->debugfs_queue);
240 err_queue:
241 debugfs_remove(ep_root);
242 err_root:
243 dev_err(&ep->udc->pdev->dev,
244 "failed to create debugfs directory for %s\n", ep->ep.name);
245 }
246
247 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
248 {
249 debugfs_remove(ep->debugfs_queue);
250 debugfs_remove(ep->debugfs_dma_status);
251 debugfs_remove(ep->debugfs_state);
252 debugfs_remove(ep->debugfs_dir);
253 ep->debugfs_dma_status = NULL;
254 ep->debugfs_dir = NULL;
255 }
256
257 static void usba_init_debugfs(struct usba_udc *udc)
258 {
259 struct dentry *root, *regs;
260 struct resource *regs_resource;
261
262 root = debugfs_create_dir(udc->gadget.name, NULL);
263 if (IS_ERR(root) || !root)
264 goto err_root;
265 udc->debugfs_root = root;
266
267 regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
268 CTRL_IOMEM_ID);
269
270 if (regs_resource) {
271 regs = debugfs_create_file_size("regs", 0400, root, udc,
272 &regs_dbg_fops,
273 resource_size(regs_resource));
274 if (!regs)
275 goto err_regs;
276 udc->debugfs_regs = regs;
277 }
278
279 usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
280
281 return;
282
283 err_regs:
284 debugfs_remove(root);
285 err_root:
286 udc->debugfs_root = NULL;
287 dev_err(&udc->pdev->dev, "debugfs is not available\n");
288 }
289
290 static void usba_cleanup_debugfs(struct usba_udc *udc)
291 {
292 usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
293 debugfs_remove(udc->debugfs_regs);
294 debugfs_remove(udc->debugfs_root);
295 udc->debugfs_regs = NULL;
296 udc->debugfs_root = NULL;
297 }
298 #else
299 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
300 struct usba_ep *ep)
301 {
302
303 }
304
305 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
306 {
307
308 }
309
310 static inline void usba_init_debugfs(struct usba_udc *udc)
311 {
312
313 }
314
315 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
316 {
317
318 }
319 #endif
320
321 static inline u32 usba_int_enb_get(struct usba_udc *udc)
322 {
323 return udc->int_enb_cache;
324 }
325
326 static inline void usba_int_enb_set(struct usba_udc *udc, u32 val)
327 {
328 usba_writel(udc, INT_ENB, val);
329 udc->int_enb_cache = val;
330 }
331
332 static int vbus_is_present(struct usba_udc *udc)
333 {
334 if (gpio_is_valid(udc->vbus_pin))
335 return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
336
337 /* No Vbus detection: Assume always present */
338 return 1;
339 }
340
341 static void toggle_bias(struct usba_udc *udc, int is_on)
342 {
343 if (udc->errata && udc->errata->toggle_bias)
344 udc->errata->toggle_bias(udc, is_on);
345 }
346
347 static void generate_bias_pulse(struct usba_udc *udc)
348 {
349 if (!udc->bias_pulse_needed)
350 return;
351
352 if (udc->errata && udc->errata->pulse_bias)
353 udc->errata->pulse_bias(udc);
354
355 udc->bias_pulse_needed = false;
356 }
357
358 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
359 {
360 unsigned int transaction_len;
361
362 transaction_len = req->req.length - req->req.actual;
363 req->last_transaction = 1;
364 if (transaction_len > ep->ep.maxpacket) {
365 transaction_len = ep->ep.maxpacket;
366 req->last_transaction = 0;
367 } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
368 req->last_transaction = 0;
369
370 DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
371 ep->ep.name, req, transaction_len,
372 req->last_transaction ? ", done" : "");
373
374 memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
375 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
376 req->req.actual += transaction_len;
377 }
378
379 static void submit_request(struct usba_ep *ep, struct usba_request *req)
380 {
381 DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
382 ep->ep.name, req, req->req.length);
383
384 req->req.actual = 0;
385 req->submitted = 1;
386
387 if (req->using_dma) {
388 if (req->req.length == 0) {
389 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
390 return;
391 }
392
393 if (req->req.zero)
394 usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
395 else
396 usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
397
398 usba_dma_writel(ep, ADDRESS, req->req.dma);
399 usba_dma_writel(ep, CONTROL, req->ctrl);
400 } else {
401 next_fifo_transaction(ep, req);
402 if (req->last_transaction) {
403 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
404 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
405 } else {
406 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
407 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
408 }
409 }
410 }
411
412 static void submit_next_request(struct usba_ep *ep)
413 {
414 struct usba_request *req;
415
416 if (list_empty(&ep->queue)) {
417 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
418 return;
419 }
420
421 req = list_entry(ep->queue.next, struct usba_request, queue);
422 if (!req->submitted)
423 submit_request(ep, req);
424 }
425
426 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
427 {
428 ep->state = STATUS_STAGE_IN;
429 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
430 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
431 }
432
433 static void receive_data(struct usba_ep *ep)
434 {
435 struct usba_udc *udc = ep->udc;
436 struct usba_request *req;
437 unsigned long status;
438 unsigned int bytecount, nr_busy;
439 int is_complete = 0;
440
441 status = usba_ep_readl(ep, STA);
442 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
443
444 DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
445
446 while (nr_busy > 0) {
447 if (list_empty(&ep->queue)) {
448 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
449 break;
450 }
451 req = list_entry(ep->queue.next,
452 struct usba_request, queue);
453
454 bytecount = USBA_BFEXT(BYTE_COUNT, status);
455
456 if (status & (1 << 31))
457 is_complete = 1;
458 if (req->req.actual + bytecount >= req->req.length) {
459 is_complete = 1;
460 bytecount = req->req.length - req->req.actual;
461 }
462
463 memcpy_fromio(req->req.buf + req->req.actual,
464 ep->fifo, bytecount);
465 req->req.actual += bytecount;
466
467 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
468
469 if (is_complete) {
470 DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
471 req->req.status = 0;
472 list_del_init(&req->queue);
473 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
474 spin_unlock(&udc->lock);
475 usb_gadget_giveback_request(&ep->ep, &req->req);
476 spin_lock(&udc->lock);
477 }
478
479 status = usba_ep_readl(ep, STA);
480 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
481
482 if (is_complete && ep_is_control(ep)) {
483 send_status(udc, ep);
484 break;
485 }
486 }
487 }
488
489 static void
490 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
491 {
492 struct usba_udc *udc = ep->udc;
493
494 WARN_ON(!list_empty(&req->queue));
495
496 if (req->req.status == -EINPROGRESS)
497 req->req.status = status;
498
499 if (req->using_dma)
500 usb_gadget_unmap_request(&udc->gadget, &req->req, ep->is_in);
501
502 DBG(DBG_GADGET | DBG_REQ,
503 "%s: req %p complete: status %d, actual %u\n",
504 ep->ep.name, req, req->req.status, req->req.actual);
505
506 spin_unlock(&udc->lock);
507 usb_gadget_giveback_request(&ep->ep, &req->req);
508 spin_lock(&udc->lock);
509 }
510
511 static void
512 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
513 {
514 struct usba_request *req, *tmp_req;
515
516 list_for_each_entry_safe(req, tmp_req, list, queue) {
517 list_del_init(&req->queue);
518 request_complete(ep, req, status);
519 }
520 }
521
522 static int
523 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
524 {
525 struct usba_ep *ep = to_usba_ep(_ep);
526 struct usba_udc *udc = ep->udc;
527 unsigned long flags, ept_cfg, maxpacket;
528 unsigned int nr_trans;
529
530 DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
531
532 maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
533
534 if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
535 || ep->index == 0
536 || desc->bDescriptorType != USB_DT_ENDPOINT
537 || maxpacket == 0
538 || maxpacket > ep->fifo_size) {
539 DBG(DBG_ERR, "ep_enable: Invalid argument");
540 return -EINVAL;
541 }
542
543 ep->is_isoc = 0;
544 ep->is_in = 0;
545
546 if (maxpacket <= 8)
547 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
548 else
549 /* LSB is bit 1, not 0 */
550 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
551
552 DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
553 ep->ep.name, ept_cfg, maxpacket);
554
555 if (usb_endpoint_dir_in(desc)) {
556 ep->is_in = 1;
557 ept_cfg |= USBA_EPT_DIR_IN;
558 }
559
560 switch (usb_endpoint_type(desc)) {
561 case USB_ENDPOINT_XFER_CONTROL:
562 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
563 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
564 break;
565 case USB_ENDPOINT_XFER_ISOC:
566 if (!ep->can_isoc) {
567 DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
568 ep->ep.name);
569 return -EINVAL;
570 }
571
572 /*
573 * Bits 11:12 specify number of _additional_
574 * transactions per microframe.
575 */
576 nr_trans = ((usb_endpoint_maxp(desc) >> 11) & 3) + 1;
577 if (nr_trans > 3)
578 return -EINVAL;
579
580 ep->is_isoc = 1;
581 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
582
583 /*
584 * Do triple-buffering on high-bandwidth iso endpoints.
585 */
586 if (nr_trans > 1 && ep->nr_banks == 3)
587 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
588 else
589 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
590 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
591 break;
592 case USB_ENDPOINT_XFER_BULK:
593 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
594 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
595 break;
596 case USB_ENDPOINT_XFER_INT:
597 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
598 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
599 break;
600 }
601
602 spin_lock_irqsave(&ep->udc->lock, flags);
603
604 ep->ep.desc = desc;
605 ep->ep.maxpacket = maxpacket;
606
607 usba_ep_writel(ep, CFG, ept_cfg);
608 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
609
610 if (ep->can_dma) {
611 u32 ctrl;
612
613 usba_int_enb_set(udc, usba_int_enb_get(udc) |
614 USBA_BF(EPT_INT, 1 << ep->index) |
615 USBA_BF(DMA_INT, 1 << ep->index));
616 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
617 usba_ep_writel(ep, CTL_ENB, ctrl);
618 } else {
619 usba_int_enb_set(udc, usba_int_enb_get(udc) |
620 USBA_BF(EPT_INT, 1 << ep->index));
621 }
622
623 spin_unlock_irqrestore(&udc->lock, flags);
624
625 DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
626 (unsigned long)usba_ep_readl(ep, CFG));
627 DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
628 (unsigned long)usba_int_enb_get(udc));
629
630 return 0;
631 }
632
633 static int usba_ep_disable(struct usb_ep *_ep)
634 {
635 struct usba_ep *ep = to_usba_ep(_ep);
636 struct usba_udc *udc = ep->udc;
637 LIST_HEAD(req_list);
638 unsigned long flags;
639
640 DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
641
642 spin_lock_irqsave(&udc->lock, flags);
643
644 if (!ep->ep.desc) {
645 spin_unlock_irqrestore(&udc->lock, flags);
646 /* REVISIT because this driver disables endpoints in
647 * reset_all_endpoints() before calling disconnect(),
648 * most gadget drivers would trigger this non-error ...
649 */
650 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
651 DBG(DBG_ERR, "ep_disable: %s not enabled\n",
652 ep->ep.name);
653 return -EINVAL;
654 }
655 ep->ep.desc = NULL;
656
657 list_splice_init(&ep->queue, &req_list);
658 if (ep->can_dma) {
659 usba_dma_writel(ep, CONTROL, 0);
660 usba_dma_writel(ep, ADDRESS, 0);
661 usba_dma_readl(ep, STATUS);
662 }
663 usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
664 usba_int_enb_set(udc, usba_int_enb_get(udc) &
665 ~USBA_BF(EPT_INT, 1 << ep->index));
666
667 request_complete_list(ep, &req_list, -ESHUTDOWN);
668
669 spin_unlock_irqrestore(&udc->lock, flags);
670
671 return 0;
672 }
673
674 static struct usb_request *
675 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
676 {
677 struct usba_request *req;
678
679 DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
680
681 req = kzalloc(sizeof(*req), gfp_flags);
682 if (!req)
683 return NULL;
684
685 INIT_LIST_HEAD(&req->queue);
686
687 return &req->req;
688 }
689
690 static void
691 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
692 {
693 struct usba_request *req = to_usba_req(_req);
694
695 DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
696
697 kfree(req);
698 }
699
700 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
701 struct usba_request *req, gfp_t gfp_flags)
702 {
703 unsigned long flags;
704 int ret;
705
706 DBG(DBG_DMA, "%s: req l/%u d/%pad %c%c%c\n",
707 ep->ep.name, req->req.length, &req->req.dma,
708 req->req.zero ? 'Z' : 'z',
709 req->req.short_not_ok ? 'S' : 's',
710 req->req.no_interrupt ? 'I' : 'i');
711
712 if (req->req.length > 0x10000) {
713 /* Lengths from 0 to 65536 (inclusive) are supported */
714 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
715 return -EINVAL;
716 }
717
718 ret = usb_gadget_map_request(&udc->gadget, &req->req, ep->is_in);
719 if (ret)
720 return ret;
721
722 req->using_dma = 1;
723 req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
724 | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
725 | USBA_DMA_END_BUF_EN;
726
727 if (!ep->is_in)
728 req->ctrl |= USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
729
730 /*
731 * Add this request to the queue and submit for DMA if
732 * possible. Check if we're still alive first -- we may have
733 * received a reset since last time we checked.
734 */
735 ret = -ESHUTDOWN;
736 spin_lock_irqsave(&udc->lock, flags);
737 if (ep->ep.desc) {
738 if (list_empty(&ep->queue))
739 submit_request(ep, req);
740
741 list_add_tail(&req->queue, &ep->queue);
742 ret = 0;
743 }
744 spin_unlock_irqrestore(&udc->lock, flags);
745
746 return ret;
747 }
748
749 static int
750 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
751 {
752 struct usba_request *req = to_usba_req(_req);
753 struct usba_ep *ep = to_usba_ep(_ep);
754 struct usba_udc *udc = ep->udc;
755 unsigned long flags;
756 int ret;
757
758 DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
759 ep->ep.name, req, _req->length);
760
761 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
762 !ep->ep.desc)
763 return -ESHUTDOWN;
764
765 req->submitted = 0;
766 req->using_dma = 0;
767 req->last_transaction = 0;
768
769 _req->status = -EINPROGRESS;
770 _req->actual = 0;
771
772 if (ep->can_dma)
773 return queue_dma(udc, ep, req, gfp_flags);
774
775 /* May have received a reset since last time we checked */
776 ret = -ESHUTDOWN;
777 spin_lock_irqsave(&udc->lock, flags);
778 if (ep->ep.desc) {
779 list_add_tail(&req->queue, &ep->queue);
780
781 if ((!ep_is_control(ep) && ep->is_in) ||
782 (ep_is_control(ep)
783 && (ep->state == DATA_STAGE_IN
784 || ep->state == STATUS_STAGE_IN)))
785 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
786 else
787 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
788 ret = 0;
789 }
790 spin_unlock_irqrestore(&udc->lock, flags);
791
792 return ret;
793 }
794
795 static void
796 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
797 {
798 req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
799 }
800
801 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
802 {
803 unsigned int timeout;
804 u32 status;
805
806 /*
807 * Stop the DMA controller. When writing both CH_EN
808 * and LINK to 0, the other bits are not affected.
809 */
810 usba_dma_writel(ep, CONTROL, 0);
811
812 /* Wait for the FIFO to empty */
813 for (timeout = 40; timeout; --timeout) {
814 status = usba_dma_readl(ep, STATUS);
815 if (!(status & USBA_DMA_CH_EN))
816 break;
817 udelay(1);
818 }
819
820 if (pstatus)
821 *pstatus = status;
822
823 if (timeout == 0) {
824 dev_err(&ep->udc->pdev->dev,
825 "%s: timed out waiting for DMA FIFO to empty\n",
826 ep->ep.name);
827 return -ETIMEDOUT;
828 }
829
830 return 0;
831 }
832
833 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
834 {
835 struct usba_ep *ep = to_usba_ep(_ep);
836 struct usba_udc *udc = ep->udc;
837 struct usba_request *req;
838 unsigned long flags;
839 u32 status;
840
841 DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
842 ep->ep.name, req);
843
844 spin_lock_irqsave(&udc->lock, flags);
845
846 list_for_each_entry(req, &ep->queue, queue) {
847 if (&req->req == _req)
848 break;
849 }
850
851 if (&req->req != _req) {
852 spin_unlock_irqrestore(&udc->lock, flags);
853 return -EINVAL;
854 }
855
856 if (req->using_dma) {
857 /*
858 * If this request is currently being transferred,
859 * stop the DMA controller and reset the FIFO.
860 */
861 if (ep->queue.next == &req->queue) {
862 status = usba_dma_readl(ep, STATUS);
863 if (status & USBA_DMA_CH_EN)
864 stop_dma(ep, &status);
865
866 #ifdef CONFIG_USB_GADGET_DEBUG_FS
867 ep->last_dma_status = status;
868 #endif
869
870 usba_writel(udc, EPT_RST, 1 << ep->index);
871
872 usba_update_req(ep, req, status);
873 }
874 }
875
876 /*
877 * Errors should stop the queue from advancing until the
878 * completion function returns.
879 */
880 list_del_init(&req->queue);
881
882 request_complete(ep, req, -ECONNRESET);
883
884 /* Process the next request if any */
885 submit_next_request(ep);
886 spin_unlock_irqrestore(&udc->lock, flags);
887
888 return 0;
889 }
890
891 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
892 {
893 struct usba_ep *ep = to_usba_ep(_ep);
894 struct usba_udc *udc = ep->udc;
895 unsigned long flags;
896 int ret = 0;
897
898 DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
899 value ? "set" : "clear");
900
901 if (!ep->ep.desc) {
902 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
903 ep->ep.name);
904 return -ENODEV;
905 }
906 if (ep->is_isoc) {
907 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
908 ep->ep.name);
909 return -ENOTTY;
910 }
911
912 spin_lock_irqsave(&udc->lock, flags);
913
914 /*
915 * We can't halt IN endpoints while there are still data to be
916 * transferred
917 */
918 if (!list_empty(&ep->queue)
919 || ((value && ep->is_in && (usba_ep_readl(ep, STA)
920 & USBA_BF(BUSY_BANKS, -1L))))) {
921 ret = -EAGAIN;
922 } else {
923 if (value)
924 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
925 else
926 usba_ep_writel(ep, CLR_STA,
927 USBA_FORCE_STALL | USBA_TOGGLE_CLR);
928 usba_ep_readl(ep, STA);
929 }
930
931 spin_unlock_irqrestore(&udc->lock, flags);
932
933 return ret;
934 }
935
936 static int usba_ep_fifo_status(struct usb_ep *_ep)
937 {
938 struct usba_ep *ep = to_usba_ep(_ep);
939
940 return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
941 }
942
943 static void usba_ep_fifo_flush(struct usb_ep *_ep)
944 {
945 struct usba_ep *ep = to_usba_ep(_ep);
946 struct usba_udc *udc = ep->udc;
947
948 usba_writel(udc, EPT_RST, 1 << ep->index);
949 }
950
951 static const struct usb_ep_ops usba_ep_ops = {
952 .enable = usba_ep_enable,
953 .disable = usba_ep_disable,
954 .alloc_request = usba_ep_alloc_request,
955 .free_request = usba_ep_free_request,
956 .queue = usba_ep_queue,
957 .dequeue = usba_ep_dequeue,
958 .set_halt = usba_ep_set_halt,
959 .fifo_status = usba_ep_fifo_status,
960 .fifo_flush = usba_ep_fifo_flush,
961 };
962
963 static int usba_udc_get_frame(struct usb_gadget *gadget)
964 {
965 struct usba_udc *udc = to_usba_udc(gadget);
966
967 return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
968 }
969
970 static int usba_udc_wakeup(struct usb_gadget *gadget)
971 {
972 struct usba_udc *udc = to_usba_udc(gadget);
973 unsigned long flags;
974 u32 ctrl;
975 int ret = -EINVAL;
976
977 spin_lock_irqsave(&udc->lock, flags);
978 if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
979 ctrl = usba_readl(udc, CTRL);
980 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
981 ret = 0;
982 }
983 spin_unlock_irqrestore(&udc->lock, flags);
984
985 return ret;
986 }
987
988 static int
989 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
990 {
991 struct usba_udc *udc = to_usba_udc(gadget);
992 unsigned long flags;
993
994 gadget->is_selfpowered = (is_selfpowered != 0);
995 spin_lock_irqsave(&udc->lock, flags);
996 if (is_selfpowered)
997 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
998 else
999 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1000 spin_unlock_irqrestore(&udc->lock, flags);
1001
1002 return 0;
1003 }
1004
1005 static int atmel_usba_start(struct usb_gadget *gadget,
1006 struct usb_gadget_driver *driver);
1007 static int atmel_usba_stop(struct usb_gadget *gadget);
1008
1009 static const struct usb_gadget_ops usba_udc_ops = {
1010 .get_frame = usba_udc_get_frame,
1011 .wakeup = usba_udc_wakeup,
1012 .set_selfpowered = usba_udc_set_selfpowered,
1013 .udc_start = atmel_usba_start,
1014 .udc_stop = atmel_usba_stop,
1015 };
1016
1017 static struct usb_endpoint_descriptor usba_ep0_desc = {
1018 .bLength = USB_DT_ENDPOINT_SIZE,
1019 .bDescriptorType = USB_DT_ENDPOINT,
1020 .bEndpointAddress = 0,
1021 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1022 .wMaxPacketSize = cpu_to_le16(64),
1023 /* FIXME: I have no idea what to put here */
1024 .bInterval = 1,
1025 };
1026
1027 static struct usb_gadget usba_gadget_template = {
1028 .ops = &usba_udc_ops,
1029 .max_speed = USB_SPEED_HIGH,
1030 .name = "atmel_usba_udc",
1031 };
1032
1033 /*
1034 * Called with interrupts disabled and udc->lock held.
1035 */
1036 static void reset_all_endpoints(struct usba_udc *udc)
1037 {
1038 struct usba_ep *ep;
1039 struct usba_request *req, *tmp_req;
1040
1041 usba_writel(udc, EPT_RST, ~0UL);
1042
1043 ep = to_usba_ep(udc->gadget.ep0);
1044 list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1045 list_del_init(&req->queue);
1046 request_complete(ep, req, -ECONNRESET);
1047 }
1048
1049 /* NOTE: normally, the next call to the gadget driver is in
1050 * charge of disabling endpoints... usually disconnect().
1051 * The exception would be entering a high speed test mode.
1052 *
1053 * FIXME remove this code ... and retest thoroughly.
1054 */
1055 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1056 if (ep->ep.desc) {
1057 spin_unlock(&udc->lock);
1058 usba_ep_disable(&ep->ep);
1059 spin_lock(&udc->lock);
1060 }
1061 }
1062 }
1063
1064 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1065 {
1066 struct usba_ep *ep;
1067
1068 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1069 return to_usba_ep(udc->gadget.ep0);
1070
1071 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1072 u8 bEndpointAddress;
1073
1074 if (!ep->ep.desc)
1075 continue;
1076 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1077 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1078 continue;
1079 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1080 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1081 return ep;
1082 }
1083
1084 return NULL;
1085 }
1086
1087 /* Called with interrupts disabled and udc->lock held */
1088 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1089 {
1090 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1091 ep->state = WAIT_FOR_SETUP;
1092 }
1093
1094 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1095 {
1096 if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1097 return 1;
1098 return 0;
1099 }
1100
1101 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1102 {
1103 u32 regval;
1104
1105 DBG(DBG_BUS, "setting address %u...\n", addr);
1106 regval = usba_readl(udc, CTRL);
1107 regval = USBA_BFINS(DEV_ADDR, addr, regval);
1108 usba_writel(udc, CTRL, regval);
1109 }
1110
1111 static int do_test_mode(struct usba_udc *udc)
1112 {
1113 static const char test_packet_buffer[] = {
1114 /* JKJKJKJK * 9 */
1115 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1116 /* JJKKJJKK * 8 */
1117 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1118 /* JJKKJJKK * 8 */
1119 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1120 /* JJJJJJJKKKKKKK * 8 */
1121 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1122 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1123 /* JJJJJJJK * 8 */
1124 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1125 /* {JKKKKKKK * 10}, JK */
1126 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1127 };
1128 struct usba_ep *ep;
1129 struct device *dev = &udc->pdev->dev;
1130 int test_mode;
1131
1132 test_mode = udc->test_mode;
1133
1134 /* Start from a clean slate */
1135 reset_all_endpoints(udc);
1136
1137 switch (test_mode) {
1138 case 0x0100:
1139 /* Test_J */
1140 usba_writel(udc, TST, USBA_TST_J_MODE);
1141 dev_info(dev, "Entering Test_J mode...\n");
1142 break;
1143 case 0x0200:
1144 /* Test_K */
1145 usba_writel(udc, TST, USBA_TST_K_MODE);
1146 dev_info(dev, "Entering Test_K mode...\n");
1147 break;
1148 case 0x0300:
1149 /*
1150 * Test_SE0_NAK: Force high-speed mode and set up ep0
1151 * for Bulk IN transfers
1152 */
1153 ep = &udc->usba_ep[0];
1154 usba_writel(udc, TST,
1155 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1156 usba_ep_writel(ep, CFG,
1157 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1158 | USBA_EPT_DIR_IN
1159 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1160 | USBA_BF(BK_NUMBER, 1));
1161 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1162 set_protocol_stall(udc, ep);
1163 dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1164 } else {
1165 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1166 dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1167 }
1168 break;
1169 case 0x0400:
1170 /* Test_Packet */
1171 ep = &udc->usba_ep[0];
1172 usba_ep_writel(ep, CFG,
1173 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1174 | USBA_EPT_DIR_IN
1175 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1176 | USBA_BF(BK_NUMBER, 1));
1177 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1178 set_protocol_stall(udc, ep);
1179 dev_err(dev, "Test_Packet: ep0 not mapped\n");
1180 } else {
1181 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1182 usba_writel(udc, TST, USBA_TST_PKT_MODE);
1183 memcpy_toio(ep->fifo, test_packet_buffer,
1184 sizeof(test_packet_buffer));
1185 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1186 dev_info(dev, "Entering Test_Packet mode...\n");
1187 }
1188 break;
1189 default:
1190 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1191 return -EINVAL;
1192 }
1193
1194 return 0;
1195 }
1196
1197 /* Avoid overly long expressions */
1198 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1199 {
1200 if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1201 return true;
1202 return false;
1203 }
1204
1205 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1206 {
1207 if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1208 return true;
1209 return false;
1210 }
1211
1212 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1213 {
1214 if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1215 return true;
1216 return false;
1217 }
1218
1219 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1220 struct usb_ctrlrequest *crq)
1221 {
1222 int retval = 0;
1223
1224 switch (crq->bRequest) {
1225 case USB_REQ_GET_STATUS: {
1226 u16 status;
1227
1228 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1229 status = cpu_to_le16(udc->devstatus);
1230 } else if (crq->bRequestType
1231 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1232 status = cpu_to_le16(0);
1233 } else if (crq->bRequestType
1234 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1235 struct usba_ep *target;
1236
1237 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1238 if (!target)
1239 goto stall;
1240
1241 status = 0;
1242 if (is_stalled(udc, target))
1243 status |= cpu_to_le16(1);
1244 } else
1245 goto delegate;
1246
1247 /* Write directly to the FIFO. No queueing is done. */
1248 if (crq->wLength != cpu_to_le16(sizeof(status)))
1249 goto stall;
1250 ep->state = DATA_STAGE_IN;
1251 usba_io_writew(status, ep->fifo);
1252 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1253 break;
1254 }
1255
1256 case USB_REQ_CLEAR_FEATURE: {
1257 if (crq->bRequestType == USB_RECIP_DEVICE) {
1258 if (feature_is_dev_remote_wakeup(crq))
1259 udc->devstatus
1260 &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1261 else
1262 /* Can't CLEAR_FEATURE TEST_MODE */
1263 goto stall;
1264 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1265 struct usba_ep *target;
1266
1267 if (crq->wLength != cpu_to_le16(0)
1268 || !feature_is_ep_halt(crq))
1269 goto stall;
1270 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1271 if (!target)
1272 goto stall;
1273
1274 usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1275 if (target->index != 0)
1276 usba_ep_writel(target, CLR_STA,
1277 USBA_TOGGLE_CLR);
1278 } else {
1279 goto delegate;
1280 }
1281
1282 send_status(udc, ep);
1283 break;
1284 }
1285
1286 case USB_REQ_SET_FEATURE: {
1287 if (crq->bRequestType == USB_RECIP_DEVICE) {
1288 if (feature_is_dev_test_mode(crq)) {
1289 send_status(udc, ep);
1290 ep->state = STATUS_STAGE_TEST;
1291 udc->test_mode = le16_to_cpu(crq->wIndex);
1292 return 0;
1293 } else if (feature_is_dev_remote_wakeup(crq)) {
1294 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1295 } else {
1296 goto stall;
1297 }
1298 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1299 struct usba_ep *target;
1300
1301 if (crq->wLength != cpu_to_le16(0)
1302 || !feature_is_ep_halt(crq))
1303 goto stall;
1304
1305 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1306 if (!target)
1307 goto stall;
1308
1309 usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1310 } else
1311 goto delegate;
1312
1313 send_status(udc, ep);
1314 break;
1315 }
1316
1317 case USB_REQ_SET_ADDRESS:
1318 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1319 goto delegate;
1320
1321 set_address(udc, le16_to_cpu(crq->wValue));
1322 send_status(udc, ep);
1323 ep->state = STATUS_STAGE_ADDR;
1324 break;
1325
1326 default:
1327 delegate:
1328 spin_unlock(&udc->lock);
1329 retval = udc->driver->setup(&udc->gadget, crq);
1330 spin_lock(&udc->lock);
1331 }
1332
1333 return retval;
1334
1335 stall:
1336 pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1337 "halting endpoint...\n",
1338 ep->ep.name, crq->bRequestType, crq->bRequest,
1339 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1340 le16_to_cpu(crq->wLength));
1341 set_protocol_stall(udc, ep);
1342 return -1;
1343 }
1344
1345 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1346 {
1347 struct usba_request *req;
1348 u32 epstatus;
1349 u32 epctrl;
1350
1351 restart:
1352 epstatus = usba_ep_readl(ep, STA);
1353 epctrl = usba_ep_readl(ep, CTL);
1354
1355 DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1356 ep->ep.name, ep->state, epstatus, epctrl);
1357
1358 req = NULL;
1359 if (!list_empty(&ep->queue))
1360 req = list_entry(ep->queue.next,
1361 struct usba_request, queue);
1362
1363 if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1364 if (req->submitted)
1365 next_fifo_transaction(ep, req);
1366 else
1367 submit_request(ep, req);
1368
1369 if (req->last_transaction) {
1370 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1371 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1372 }
1373 goto restart;
1374 }
1375 if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1376 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1377
1378 switch (ep->state) {
1379 case DATA_STAGE_IN:
1380 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1381 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1382 ep->state = STATUS_STAGE_OUT;
1383 break;
1384 case STATUS_STAGE_ADDR:
1385 /* Activate our new address */
1386 usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1387 | USBA_FADDR_EN));
1388 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1389 ep->state = WAIT_FOR_SETUP;
1390 break;
1391 case STATUS_STAGE_IN:
1392 if (req) {
1393 list_del_init(&req->queue);
1394 request_complete(ep, req, 0);
1395 submit_next_request(ep);
1396 }
1397 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1398 ep->state = WAIT_FOR_SETUP;
1399 break;
1400 case STATUS_STAGE_TEST:
1401 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1402 ep->state = WAIT_FOR_SETUP;
1403 if (do_test_mode(udc))
1404 set_protocol_stall(udc, ep);
1405 break;
1406 default:
1407 pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1408 "halting endpoint...\n",
1409 ep->ep.name, ep->state);
1410 set_protocol_stall(udc, ep);
1411 break;
1412 }
1413
1414 goto restart;
1415 }
1416 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1417 switch (ep->state) {
1418 case STATUS_STAGE_OUT:
1419 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1420 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1421
1422 if (req) {
1423 list_del_init(&req->queue);
1424 request_complete(ep, req, 0);
1425 }
1426 ep->state = WAIT_FOR_SETUP;
1427 break;
1428
1429 case DATA_STAGE_OUT:
1430 receive_data(ep);
1431 break;
1432
1433 default:
1434 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1435 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1436 pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1437 "halting endpoint...\n",
1438 ep->ep.name, ep->state);
1439 set_protocol_stall(udc, ep);
1440 break;
1441 }
1442
1443 goto restart;
1444 }
1445 if (epstatus & USBA_RX_SETUP) {
1446 union {
1447 struct usb_ctrlrequest crq;
1448 unsigned long data[2];
1449 } crq;
1450 unsigned int pkt_len;
1451 int ret;
1452
1453 if (ep->state != WAIT_FOR_SETUP) {
1454 /*
1455 * Didn't expect a SETUP packet at this
1456 * point. Clean up any pending requests (which
1457 * may be successful).
1458 */
1459 int status = -EPROTO;
1460
1461 /*
1462 * RXRDY and TXCOMP are dropped when SETUP
1463 * packets arrive. Just pretend we received
1464 * the status packet.
1465 */
1466 if (ep->state == STATUS_STAGE_OUT
1467 || ep->state == STATUS_STAGE_IN) {
1468 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1469 status = 0;
1470 }
1471
1472 if (req) {
1473 list_del_init(&req->queue);
1474 request_complete(ep, req, status);
1475 }
1476 }
1477
1478 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1479 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1480 if (pkt_len != sizeof(crq)) {
1481 pr_warning("udc: Invalid packet length %u "
1482 "(expected %zu)\n", pkt_len, sizeof(crq));
1483 set_protocol_stall(udc, ep);
1484 return;
1485 }
1486
1487 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1488 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1489
1490 /* Free up one bank in the FIFO so that we can
1491 * generate or receive a reply right away. */
1492 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1493
1494 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1495 ep->state, crq.crq.bRequestType,
1496 crq.crq.bRequest); */
1497
1498 if (crq.crq.bRequestType & USB_DIR_IN) {
1499 /*
1500 * The USB 2.0 spec states that "if wLength is
1501 * zero, there is no data transfer phase."
1502 * However, testusb #14 seems to actually
1503 * expect a data phase even if wLength = 0...
1504 */
1505 ep->state = DATA_STAGE_IN;
1506 } else {
1507 if (crq.crq.wLength != cpu_to_le16(0))
1508 ep->state = DATA_STAGE_OUT;
1509 else
1510 ep->state = STATUS_STAGE_IN;
1511 }
1512
1513 ret = -1;
1514 if (ep->index == 0)
1515 ret = handle_ep0_setup(udc, ep, &crq.crq);
1516 else {
1517 spin_unlock(&udc->lock);
1518 ret = udc->driver->setup(&udc->gadget, &crq.crq);
1519 spin_lock(&udc->lock);
1520 }
1521
1522 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1523 crq.crq.bRequestType, crq.crq.bRequest,
1524 le16_to_cpu(crq.crq.wLength), ep->state, ret);
1525
1526 if (ret < 0) {
1527 /* Let the host know that we failed */
1528 set_protocol_stall(udc, ep);
1529 }
1530 }
1531 }
1532
1533 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1534 {
1535 struct usba_request *req;
1536 u32 epstatus;
1537 u32 epctrl;
1538
1539 epstatus = usba_ep_readl(ep, STA);
1540 epctrl = usba_ep_readl(ep, CTL);
1541
1542 DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1543
1544 while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1545 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1546
1547 if (list_empty(&ep->queue)) {
1548 dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1549 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1550 return;
1551 }
1552
1553 req = list_entry(ep->queue.next, struct usba_request, queue);
1554
1555 if (req->using_dma) {
1556 /* Send a zero-length packet */
1557 usba_ep_writel(ep, SET_STA,
1558 USBA_TX_PK_RDY);
1559 usba_ep_writel(ep, CTL_DIS,
1560 USBA_TX_PK_RDY);
1561 list_del_init(&req->queue);
1562 submit_next_request(ep);
1563 request_complete(ep, req, 0);
1564 } else {
1565 if (req->submitted)
1566 next_fifo_transaction(ep, req);
1567 else
1568 submit_request(ep, req);
1569
1570 if (req->last_transaction) {
1571 list_del_init(&req->queue);
1572 submit_next_request(ep);
1573 request_complete(ep, req, 0);
1574 }
1575 }
1576
1577 epstatus = usba_ep_readl(ep, STA);
1578 epctrl = usba_ep_readl(ep, CTL);
1579 }
1580 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1581 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1582 receive_data(ep);
1583 }
1584 }
1585
1586 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1587 {
1588 struct usba_request *req;
1589 u32 status, control, pending;
1590
1591 status = usba_dma_readl(ep, STATUS);
1592 control = usba_dma_readl(ep, CONTROL);
1593 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1594 ep->last_dma_status = status;
1595 #endif
1596 pending = status & control;
1597 DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1598
1599 if (status & USBA_DMA_CH_EN) {
1600 dev_err(&udc->pdev->dev,
1601 "DMA_CH_EN is set after transfer is finished!\n");
1602 dev_err(&udc->pdev->dev,
1603 "status=%#08x, pending=%#08x, control=%#08x\n",
1604 status, pending, control);
1605
1606 /*
1607 * try to pretend nothing happened. We might have to
1608 * do something here...
1609 */
1610 }
1611
1612 if (list_empty(&ep->queue))
1613 /* Might happen if a reset comes along at the right moment */
1614 return;
1615
1616 if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1617 req = list_entry(ep->queue.next, struct usba_request, queue);
1618 usba_update_req(ep, req, status);
1619
1620 list_del_init(&req->queue);
1621 submit_next_request(ep);
1622 request_complete(ep, req, 0);
1623 }
1624 }
1625
1626 static irqreturn_t usba_udc_irq(int irq, void *devid)
1627 {
1628 struct usba_udc *udc = devid;
1629 u32 status, int_enb;
1630 u32 dma_status;
1631 u32 ep_status;
1632
1633 spin_lock(&udc->lock);
1634
1635 int_enb = usba_int_enb_get(udc);
1636 status = usba_readl(udc, INT_STA) & (int_enb | USBA_HIGH_SPEED);
1637 DBG(DBG_INT, "irq, status=%#08x\n", status);
1638
1639 if (status & USBA_DET_SUSPEND) {
1640 toggle_bias(udc, 0);
1641 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1642 usba_int_enb_set(udc, int_enb | USBA_WAKE_UP);
1643 udc->bias_pulse_needed = true;
1644 DBG(DBG_BUS, "Suspend detected\n");
1645 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1646 && udc->driver && udc->driver->suspend) {
1647 spin_unlock(&udc->lock);
1648 udc->driver->suspend(&udc->gadget);
1649 spin_lock(&udc->lock);
1650 }
1651 }
1652
1653 if (status & USBA_WAKE_UP) {
1654 toggle_bias(udc, 1);
1655 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1656 usba_int_enb_set(udc, int_enb & ~USBA_WAKE_UP);
1657 DBG(DBG_BUS, "Wake Up CPU detected\n");
1658 }
1659
1660 if (status & USBA_END_OF_RESUME) {
1661 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1662 generate_bias_pulse(udc);
1663 DBG(DBG_BUS, "Resume detected\n");
1664 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1665 && udc->driver && udc->driver->resume) {
1666 spin_unlock(&udc->lock);
1667 udc->driver->resume(&udc->gadget);
1668 spin_lock(&udc->lock);
1669 }
1670 }
1671
1672 dma_status = USBA_BFEXT(DMA_INT, status);
1673 if (dma_status) {
1674 int i;
1675
1676 for (i = 1; i <= USBA_NR_DMAS; i++)
1677 if (dma_status & (1 << i))
1678 usba_dma_irq(udc, &udc->usba_ep[i]);
1679 }
1680
1681 ep_status = USBA_BFEXT(EPT_INT, status);
1682 if (ep_status) {
1683 int i;
1684
1685 for (i = 0; i < udc->num_ep; i++)
1686 if (ep_status & (1 << i)) {
1687 if (ep_is_control(&udc->usba_ep[i]))
1688 usba_control_irq(udc, &udc->usba_ep[i]);
1689 else
1690 usba_ep_irq(udc, &udc->usba_ep[i]);
1691 }
1692 }
1693
1694 if (status & USBA_END_OF_RESET) {
1695 struct usba_ep *ep0;
1696
1697 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1698 generate_bias_pulse(udc);
1699 reset_all_endpoints(udc);
1700
1701 if (udc->gadget.speed != USB_SPEED_UNKNOWN && udc->driver) {
1702 udc->gadget.speed = USB_SPEED_UNKNOWN;
1703 spin_unlock(&udc->lock);
1704 usb_gadget_udc_reset(&udc->gadget, udc->driver);
1705 spin_lock(&udc->lock);
1706 }
1707
1708 if (status & USBA_HIGH_SPEED)
1709 udc->gadget.speed = USB_SPEED_HIGH;
1710 else
1711 udc->gadget.speed = USB_SPEED_FULL;
1712 DBG(DBG_BUS, "%s bus reset detected\n",
1713 usb_speed_string(udc->gadget.speed));
1714
1715 ep0 = &udc->usba_ep[0];
1716 ep0->ep.desc = &usba_ep0_desc;
1717 ep0->state = WAIT_FOR_SETUP;
1718 usba_ep_writel(ep0, CFG,
1719 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1720 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1721 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1722 usba_ep_writel(ep0, CTL_ENB,
1723 USBA_EPT_ENABLE | USBA_RX_SETUP);
1724 usba_int_enb_set(udc, int_enb | USBA_BF(EPT_INT, 1) |
1725 USBA_DET_SUSPEND | USBA_END_OF_RESUME);
1726
1727 /*
1728 * Unclear why we hit this irregularly, e.g. in usbtest,
1729 * but it's clearly harmless...
1730 */
1731 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1732 dev_dbg(&udc->pdev->dev,
1733 "ODD: EP0 configuration is invalid!\n");
1734 }
1735
1736 spin_unlock(&udc->lock);
1737
1738 return IRQ_HANDLED;
1739 }
1740
1741 static int start_clock(struct usba_udc *udc)
1742 {
1743 int ret;
1744
1745 if (udc->clocked)
1746 return 0;
1747
1748 ret = clk_prepare_enable(udc->pclk);
1749 if (ret)
1750 return ret;
1751 ret = clk_prepare_enable(udc->hclk);
1752 if (ret) {
1753 clk_disable_unprepare(udc->pclk);
1754 return ret;
1755 }
1756
1757 udc->clocked = true;
1758 return 0;
1759 }
1760
1761 static void stop_clock(struct usba_udc *udc)
1762 {
1763 if (!udc->clocked)
1764 return;
1765
1766 clk_disable_unprepare(udc->hclk);
1767 clk_disable_unprepare(udc->pclk);
1768
1769 udc->clocked = false;
1770 }
1771
1772 static int usba_start(struct usba_udc *udc)
1773 {
1774 unsigned long flags;
1775 int ret;
1776
1777 ret = start_clock(udc);
1778 if (ret)
1779 return ret;
1780
1781 spin_lock_irqsave(&udc->lock, flags);
1782 toggle_bias(udc, 1);
1783 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1784 usba_int_enb_set(udc, USBA_END_OF_RESET);
1785 spin_unlock_irqrestore(&udc->lock, flags);
1786
1787 return 0;
1788 }
1789
1790 static void usba_stop(struct usba_udc *udc)
1791 {
1792 unsigned long flags;
1793
1794 spin_lock_irqsave(&udc->lock, flags);
1795 udc->gadget.speed = USB_SPEED_UNKNOWN;
1796 reset_all_endpoints(udc);
1797
1798 /* This will also disable the DP pullup */
1799 toggle_bias(udc, 0);
1800 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1801 spin_unlock_irqrestore(&udc->lock, flags);
1802
1803 stop_clock(udc);
1804 }
1805
1806 static irqreturn_t usba_vbus_irq_thread(int irq, void *devid)
1807 {
1808 struct usba_udc *udc = devid;
1809 int vbus;
1810
1811 /* debounce */
1812 udelay(10);
1813
1814 mutex_lock(&udc->vbus_mutex);
1815
1816 vbus = vbus_is_present(udc);
1817 if (vbus != udc->vbus_prev) {
1818 if (vbus) {
1819 usba_start(udc);
1820 } else {
1821 usba_stop(udc);
1822
1823 if (udc->driver->disconnect)
1824 udc->driver->disconnect(&udc->gadget);
1825 }
1826 udc->vbus_prev = vbus;
1827 }
1828
1829 mutex_unlock(&udc->vbus_mutex);
1830 return IRQ_HANDLED;
1831 }
1832
1833 static int atmel_usba_start(struct usb_gadget *gadget,
1834 struct usb_gadget_driver *driver)
1835 {
1836 int ret;
1837 struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1838 unsigned long flags;
1839
1840 spin_lock_irqsave(&udc->lock, flags);
1841 udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1842 udc->driver = driver;
1843 spin_unlock_irqrestore(&udc->lock, flags);
1844
1845 mutex_lock(&udc->vbus_mutex);
1846
1847 if (gpio_is_valid(udc->vbus_pin))
1848 enable_irq(gpio_to_irq(udc->vbus_pin));
1849
1850 /* If Vbus is present, enable the controller and wait for reset */
1851 udc->vbus_prev = vbus_is_present(udc);
1852 if (udc->vbus_prev) {
1853 ret = usba_start(udc);
1854 if (ret)
1855 goto err;
1856 }
1857
1858 mutex_unlock(&udc->vbus_mutex);
1859 return 0;
1860
1861 err:
1862 if (gpio_is_valid(udc->vbus_pin))
1863 disable_irq(gpio_to_irq(udc->vbus_pin));
1864
1865 mutex_unlock(&udc->vbus_mutex);
1866
1867 spin_lock_irqsave(&udc->lock, flags);
1868 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1869 udc->driver = NULL;
1870 spin_unlock_irqrestore(&udc->lock, flags);
1871 return ret;
1872 }
1873
1874 static int atmel_usba_stop(struct usb_gadget *gadget)
1875 {
1876 struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1877
1878 if (gpio_is_valid(udc->vbus_pin))
1879 disable_irq(gpio_to_irq(udc->vbus_pin));
1880
1881 usba_stop(udc);
1882
1883 udc->driver = NULL;
1884
1885 return 0;
1886 }
1887
1888 #ifdef CONFIG_OF
1889 static void at91sam9rl_toggle_bias(struct usba_udc *udc, int is_on)
1890 {
1891 unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
1892
1893 if (is_on)
1894 at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
1895 else
1896 at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
1897 }
1898
1899 static void at91sam9g45_pulse_bias(struct usba_udc *udc)
1900 {
1901 unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
1902
1903 at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
1904 at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
1905 }
1906
1907 static const struct usba_udc_errata at91sam9rl_errata = {
1908 .toggle_bias = at91sam9rl_toggle_bias,
1909 };
1910
1911 static const struct usba_udc_errata at91sam9g45_errata = {
1912 .pulse_bias = at91sam9g45_pulse_bias,
1913 };
1914
1915 static const struct of_device_id atmel_udc_dt_ids[] = {
1916 { .compatible = "atmel,at91sam9rl-udc", .data = &at91sam9rl_errata },
1917 { .compatible = "atmel,at91sam9g45-udc", .data = &at91sam9g45_errata },
1918 { .compatible = "atmel,sama5d3-udc" },
1919 { /* sentinel */ }
1920 };
1921
1922 MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
1923
1924 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1925 struct usba_udc *udc)
1926 {
1927 u32 val;
1928 const char *name;
1929 enum of_gpio_flags flags;
1930 struct device_node *np = pdev->dev.of_node;
1931 const struct of_device_id *match;
1932 struct device_node *pp;
1933 int i, ret;
1934 struct usba_ep *eps, *ep;
1935
1936 match = of_match_node(atmel_udc_dt_ids, np);
1937 if (!match)
1938 return ERR_PTR(-EINVAL);
1939
1940 udc->errata = match->data;
1941
1942 udc->num_ep = 0;
1943
1944 udc->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1945 &flags);
1946 udc->vbus_pin_inverted = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1947
1948 pp = NULL;
1949 while ((pp = of_get_next_child(np, pp)))
1950 udc->num_ep++;
1951
1952 eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * udc->num_ep,
1953 GFP_KERNEL);
1954 if (!eps)
1955 return ERR_PTR(-ENOMEM);
1956
1957 udc->gadget.ep0 = &eps[0].ep;
1958
1959 INIT_LIST_HEAD(&eps[0].ep.ep_list);
1960
1961 pp = NULL;
1962 i = 0;
1963 while ((pp = of_get_next_child(np, pp))) {
1964 ep = &eps[i];
1965
1966 ret = of_property_read_u32(pp, "reg", &val);
1967 if (ret) {
1968 dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
1969 goto err;
1970 }
1971 ep->index = val;
1972
1973 ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
1974 if (ret) {
1975 dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
1976 goto err;
1977 }
1978 ep->fifo_size = val;
1979
1980 ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
1981 if (ret) {
1982 dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
1983 goto err;
1984 }
1985 ep->nr_banks = val;
1986
1987 ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
1988 ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");
1989
1990 ret = of_property_read_string(pp, "name", &name);
1991 if (ret) {
1992 dev_err(&pdev->dev, "of_probe: name error(%d)\n", ret);
1993 goto err;
1994 }
1995 ep->ep.name = name;
1996
1997 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1998 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1999 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
2000 ep->ep.ops = &usba_ep_ops;
2001 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
2002 ep->udc = udc;
2003 INIT_LIST_HEAD(&ep->queue);
2004
2005 if (ep->index == 0) {
2006 ep->ep.caps.type_control = true;
2007 } else {
2008 ep->ep.caps.type_iso = ep->can_isoc;
2009 ep->ep.caps.type_bulk = true;
2010 ep->ep.caps.type_int = true;
2011 }
2012
2013 ep->ep.caps.dir_in = true;
2014 ep->ep.caps.dir_out = true;
2015
2016 if (i)
2017 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
2018
2019 i++;
2020 }
2021
2022 if (i == 0) {
2023 dev_err(&pdev->dev, "of_probe: no endpoint specified\n");
2024 ret = -EINVAL;
2025 goto err;
2026 }
2027
2028 return eps;
2029 err:
2030 return ERR_PTR(ret);
2031 }
2032 #else
2033 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
2034 struct usba_udc *udc)
2035 {
2036 return ERR_PTR(-ENOSYS);
2037 }
2038 #endif
2039
2040 static struct usba_ep * usba_udc_pdata(struct platform_device *pdev,
2041 struct usba_udc *udc)
2042 {
2043 struct usba_platform_data *pdata = dev_get_platdata(&pdev->dev);
2044 struct usba_ep *eps;
2045 int i;
2046
2047 if (!pdata)
2048 return ERR_PTR(-ENXIO);
2049
2050 eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * pdata->num_ep,
2051 GFP_KERNEL);
2052 if (!eps)
2053 return ERR_PTR(-ENOMEM);
2054
2055 udc->gadget.ep0 = &eps[0].ep;
2056
2057 udc->vbus_pin = pdata->vbus_pin;
2058 udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
2059 udc->num_ep = pdata->num_ep;
2060
2061 INIT_LIST_HEAD(&eps[0].ep.ep_list);
2062
2063 for (i = 0; i < pdata->num_ep; i++) {
2064 struct usba_ep *ep = &eps[i];
2065
2066 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
2067 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
2068 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
2069 ep->ep.ops = &usba_ep_ops;
2070 ep->ep.name = pdata->ep[i].name;
2071 ep->fifo_size = pdata->ep[i].fifo_size;
2072 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
2073 ep->udc = udc;
2074 INIT_LIST_HEAD(&ep->queue);
2075 ep->nr_banks = pdata->ep[i].nr_banks;
2076 ep->index = pdata->ep[i].index;
2077 ep->can_dma = pdata->ep[i].can_dma;
2078 ep->can_isoc = pdata->ep[i].can_isoc;
2079
2080 if (i == 0) {
2081 ep->ep.caps.type_control = true;
2082 } else {
2083 ep->ep.caps.type_iso = ep->can_isoc;
2084 ep->ep.caps.type_bulk = true;
2085 ep->ep.caps.type_int = true;
2086 }
2087
2088 ep->ep.caps.dir_in = true;
2089 ep->ep.caps.dir_out = true;
2090
2091 if (i)
2092 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
2093 }
2094
2095 return eps;
2096 }
2097
2098 static int usba_udc_probe(struct platform_device *pdev)
2099 {
2100 struct resource *regs, *fifo;
2101 struct clk *pclk, *hclk;
2102 struct usba_udc *udc;
2103 int irq, ret, i;
2104
2105 udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
2106 if (!udc)
2107 return -ENOMEM;
2108
2109 udc->gadget = usba_gadget_template;
2110 INIT_LIST_HEAD(&udc->gadget.ep_list);
2111
2112 regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
2113 fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
2114 if (!regs || !fifo)
2115 return -ENXIO;
2116
2117 irq = platform_get_irq(pdev, 0);
2118 if (irq < 0)
2119 return irq;
2120
2121 pclk = devm_clk_get(&pdev->dev, "pclk");
2122 if (IS_ERR(pclk))
2123 return PTR_ERR(pclk);
2124 hclk = devm_clk_get(&pdev->dev, "hclk");
2125 if (IS_ERR(hclk))
2126 return PTR_ERR(hclk);
2127
2128 spin_lock_init(&udc->lock);
2129 mutex_init(&udc->vbus_mutex);
2130 udc->pdev = pdev;
2131 udc->pclk = pclk;
2132 udc->hclk = hclk;
2133 udc->vbus_pin = -ENODEV;
2134
2135 ret = -ENOMEM;
2136 udc->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2137 if (!udc->regs) {
2138 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
2139 return ret;
2140 }
2141 dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
2142 (unsigned long)regs->start, udc->regs);
2143 udc->fifo = devm_ioremap(&pdev->dev, fifo->start, resource_size(fifo));
2144 if (!udc->fifo) {
2145 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
2146 return ret;
2147 }
2148 dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
2149 (unsigned long)fifo->start, udc->fifo);
2150
2151 platform_set_drvdata(pdev, udc);
2152
2153 /* Make sure we start from a clean slate */
2154 ret = clk_prepare_enable(pclk);
2155 if (ret) {
2156 dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
2157 return ret;
2158 }
2159
2160 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
2161 clk_disable_unprepare(pclk);
2162
2163 if (pdev->dev.of_node)
2164 udc->usba_ep = atmel_udc_of_init(pdev, udc);
2165 else
2166 udc->usba_ep = usba_udc_pdata(pdev, udc);
2167
2168 toggle_bias(udc, 0);
2169
2170 if (IS_ERR(udc->usba_ep))
2171 return PTR_ERR(udc->usba_ep);
2172
2173 ret = devm_request_irq(&pdev->dev, irq, usba_udc_irq, 0,
2174 "atmel_usba_udc", udc);
2175 if (ret) {
2176 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
2177 irq, ret);
2178 return ret;
2179 }
2180 udc->irq = irq;
2181
2182 if (gpio_is_valid(udc->vbus_pin)) {
2183 if (!devm_gpio_request(&pdev->dev, udc->vbus_pin, "atmel_usba_udc")) {
2184 irq_set_status_flags(gpio_to_irq(udc->vbus_pin),
2185 IRQ_NOAUTOEN);
2186 ret = devm_request_threaded_irq(&pdev->dev,
2187 gpio_to_irq(udc->vbus_pin), NULL,
2188 usba_vbus_irq_thread, IRQF_ONESHOT,
2189 "atmel_usba_udc", udc);
2190 if (ret) {
2191 udc->vbus_pin = -ENODEV;
2192 dev_warn(&udc->pdev->dev,
2193 "failed to request vbus irq; "
2194 "assuming always on\n");
2195 }
2196 } else {
2197 /* gpio_request fail so use -EINVAL for gpio_is_valid */
2198 udc->vbus_pin = -EINVAL;
2199 }
2200 }
2201
2202 ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2203 if (ret)
2204 return ret;
2205 device_init_wakeup(&pdev->dev, 1);
2206
2207 usba_init_debugfs(udc);
2208 for (i = 1; i < udc->num_ep; i++)
2209 usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
2210
2211 return 0;
2212 }
2213
2214 static int usba_udc_remove(struct platform_device *pdev)
2215 {
2216 struct usba_udc *udc;
2217 int i;
2218
2219 udc = platform_get_drvdata(pdev);
2220
2221 device_init_wakeup(&pdev->dev, 0);
2222 usb_del_gadget_udc(&udc->gadget);
2223
2224 for (i = 1; i < udc->num_ep; i++)
2225 usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
2226 usba_cleanup_debugfs(udc);
2227
2228 return 0;
2229 }
2230
2231 #ifdef CONFIG_PM_SLEEP
2232 static int usba_udc_suspend(struct device *dev)
2233 {
2234 struct usba_udc *udc = dev_get_drvdata(dev);
2235
2236 /* Not started */
2237 if (!udc->driver)
2238 return 0;
2239
2240 mutex_lock(&udc->vbus_mutex);
2241
2242 if (!device_may_wakeup(dev)) {
2243 usba_stop(udc);
2244 goto out;
2245 }
2246
2247 /*
2248 * Device may wake up. We stay clocked if we failed
2249 * to request vbus irq, assuming always on.
2250 */
2251 if (gpio_is_valid(udc->vbus_pin)) {
2252 usba_stop(udc);
2253 enable_irq_wake(gpio_to_irq(udc->vbus_pin));
2254 }
2255
2256 out:
2257 mutex_unlock(&udc->vbus_mutex);
2258 return 0;
2259 }
2260
2261 static int usba_udc_resume(struct device *dev)
2262 {
2263 struct usba_udc *udc = dev_get_drvdata(dev);
2264
2265 /* Not started */
2266 if (!udc->driver)
2267 return 0;
2268
2269 if (device_may_wakeup(dev) && gpio_is_valid(udc->vbus_pin))
2270 disable_irq_wake(gpio_to_irq(udc->vbus_pin));
2271
2272 /* If Vbus is present, enable the controller and wait for reset */
2273 mutex_lock(&udc->vbus_mutex);
2274 udc->vbus_prev = vbus_is_present(udc);
2275 if (udc->vbus_prev)
2276 usba_start(udc);
2277 mutex_unlock(&udc->vbus_mutex);
2278
2279 return 0;
2280 }
2281 #endif
2282
2283 static SIMPLE_DEV_PM_OPS(usba_udc_pm_ops, usba_udc_suspend, usba_udc_resume);
2284
2285 static struct platform_driver udc_driver = {
2286 .remove = usba_udc_remove,
2287 .driver = {
2288 .name = "atmel_usba_udc",
2289 .pm = &usba_udc_pm_ops,
2290 .of_match_table = of_match_ptr(atmel_udc_dt_ids),
2291 },
2292 };
2293
2294 module_platform_driver_probe(udc_driver, usba_udc_probe);
2295
2296 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2297 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2298 MODULE_LICENSE("GPL");
2299 MODULE_ALIAS("platform:atmel_usba_udc");
Linux with added FPC-III support