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Merge tag 'usb-for-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb...
[linux-2.6/btrfs-unstable.git] / drivers / usb / gadget / udc / atmel_usba_udc.c
blob4095cce05e6a729ccf86ff5f6394e55f7cf0511f
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/platform_data/atmel.h>
26 #include <linux/of.h>
27 #include <linux/of_gpio.h>
28
29 #include <asm/gpio.h>
30
31 #include "atmel_usba_udc.h"
32
33 #ifdef CONFIG_USB_GADGET_DEBUG_FS
34 #include <linux/debugfs.h>
35 #include <linux/uaccess.h>
36
37 static int queue_dbg_open(struct inode *inode, struct file *file)
38 {
39 struct usba_ep *ep = inode->i_private;
40 struct usba_request *req, *req_copy;
41 struct list_head *queue_data;
42
43 queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
44 if (!queue_data)
45 return -ENOMEM;
46 INIT_LIST_HEAD(queue_data);
47
48 spin_lock_irq(&ep->udc->lock);
49 list_for_each_entry(req, &ep->queue, queue) {
50 req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
51 if (!req_copy)
52 goto fail;
53 list_add_tail(&req_copy->queue, queue_data);
54 }
55 spin_unlock_irq(&ep->udc->lock);
56
57 file->private_data = queue_data;
58 return 0;
59
60 fail:
61 spin_unlock_irq(&ep->udc->lock);
62 list_for_each_entry_safe(req, req_copy, queue_data, queue) {
63 list_del(&req->queue);
64 kfree(req);
65 }
66 kfree(queue_data);
67 return -ENOMEM;
68 }
69
70 /*
71 * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
72 *
73 * b: buffer address
74 * l: buffer length
75 * I/i: interrupt/no interrupt
76 * Z/z: zero/no zero
77 * S/s: short ok/short not ok
78 * s: status
79 * n: nr_packets
80 * F/f: submitted/not submitted to FIFO
81 * D/d: using/not using DMA
82 * L/l: last transaction/not last transaction
83 */
84 static ssize_t queue_dbg_read(struct file *file, char __user *buf,
85 size_t nbytes, loff_t *ppos)
86 {
87 struct list_head *queue = file->private_data;
88 struct usba_request *req, *tmp_req;
89 size_t len, remaining, actual = 0;
90 char tmpbuf[38];
91
92 if (!access_ok(VERIFY_WRITE, buf, nbytes))
93 return -EFAULT;
94
95 mutex_lock(&file_inode(file)->i_mutex);
96 list_for_each_entry_safe(req, tmp_req, queue, queue) {
97 len = snprintf(tmpbuf, sizeof(tmpbuf),
98 "%8p %08x %c%c%c %5d %c%c%c\n",
99 req->req.buf, req->req.length,
100 req->req.no_interrupt ? 'i' : 'I',
101 req->req.zero ? 'Z' : 'z',
102 req->req.short_not_ok ? 's' : 'S',
103 req->req.status,
104 req->submitted ? 'F' : 'f',
105 req->using_dma ? 'D' : 'd',
106 req->last_transaction ? 'L' : 'l');
107 len = min(len, sizeof(tmpbuf));
108 if (len > nbytes)
109 break;
110
111 list_del(&req->queue);
112 kfree(req);
113
114 remaining = __copy_to_user(buf, tmpbuf, len);
115 actual += len - remaining;
116 if (remaining)
117 break;
118
119 nbytes -= len;
120 buf += len;
121 }
122 mutex_unlock(&file_inode(file)->i_mutex);
123
124 return actual;
125 }
126
127 static int queue_dbg_release(struct inode *inode, struct file *file)
128 {
129 struct list_head *queue_data = file->private_data;
130 struct usba_request *req, *tmp_req;
131
132 list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
133 list_del(&req->queue);
134 kfree(req);
135 }
136 kfree(queue_data);
137 return 0;
138 }
139
140 static int regs_dbg_open(struct inode *inode, struct file *file)
141 {
142 struct usba_udc *udc;
143 unsigned int i;
144 u32 *data;
145 int ret = -ENOMEM;
146
147 mutex_lock(&inode->i_mutex);
148 udc = inode->i_private;
149 data = kmalloc(inode->i_size, GFP_KERNEL);
150 if (!data)
151 goto out;
152
153 spin_lock_irq(&udc->lock);
154 for (i = 0; i < inode->i_size / 4; i++)
155 data[i] = usba_io_readl(udc->regs + i * 4);
156 spin_unlock_irq(&udc->lock);
157
158 file->private_data = data;
159 ret = 0;
160
161 out:
162 mutex_unlock(&inode->i_mutex);
163
164 return ret;
165 }
166
167 static ssize_t regs_dbg_read(struct file *file, char __user *buf,
168 size_t nbytes, loff_t *ppos)
169 {
170 struct inode *inode = file_inode(file);
171 int ret;
172
173 mutex_lock(&inode->i_mutex);
174 ret = simple_read_from_buffer(buf, nbytes, ppos,
175 file->private_data,
176 file_inode(file)->i_size);
177 mutex_unlock(&inode->i_mutex);
178
179 return ret;
180 }
181
182 static int regs_dbg_release(struct inode *inode, struct file *file)
183 {
184 kfree(file->private_data);
185 return 0;
186 }
187
188 const struct file_operations queue_dbg_fops = {
189 .owner = THIS_MODULE,
190 .open = queue_dbg_open,
191 .llseek = no_llseek,
192 .read = queue_dbg_read,
193 .release = queue_dbg_release,
194 };
195
196 const struct file_operations regs_dbg_fops = {
197 .owner = THIS_MODULE,
198 .open = regs_dbg_open,
199 .llseek = generic_file_llseek,
200 .read = regs_dbg_read,
201 .release = regs_dbg_release,
202 };
203
204 static void usba_ep_init_debugfs(struct usba_udc *udc,
205 struct usba_ep *ep)
206 {
207 struct dentry *ep_root;
208
209 ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
210 if (!ep_root)
211 goto err_root;
212 ep->debugfs_dir = ep_root;
213
214 ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
215 ep, &queue_dbg_fops);
216 if (!ep->debugfs_queue)
217 goto err_queue;
218
219 if (ep->can_dma) {
220 ep->debugfs_dma_status
221 = debugfs_create_u32("dma_status", 0400, ep_root,
222 &ep->last_dma_status);
223 if (!ep->debugfs_dma_status)
224 goto err_dma_status;
225 }
226 if (ep_is_control(ep)) {
227 ep->debugfs_state
228 = debugfs_create_u32("state", 0400, ep_root,
229 &ep->state);
230 if (!ep->debugfs_state)
231 goto err_state;
232 }
233
234 return;
235
236 err_state:
237 if (ep->can_dma)
238 debugfs_remove(ep->debugfs_dma_status);
239 err_dma_status:
240 debugfs_remove(ep->debugfs_queue);
241 err_queue:
242 debugfs_remove(ep_root);
243 err_root:
244 dev_err(&ep->udc->pdev->dev,
245 "failed to create debugfs directory for %s\n", ep->ep.name);
246 }
247
248 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
249 {
250 debugfs_remove(ep->debugfs_queue);
251 debugfs_remove(ep->debugfs_dma_status);
252 debugfs_remove(ep->debugfs_state);
253 debugfs_remove(ep->debugfs_dir);
254 ep->debugfs_dma_status = NULL;
255 ep->debugfs_dir = NULL;
256 }
257
258 static void usba_init_debugfs(struct usba_udc *udc)
259 {
260 struct dentry *root, *regs;
261 struct resource *regs_resource;
262
263 root = debugfs_create_dir(udc->gadget.name, NULL);
264 if (IS_ERR(root) || !root)
265 goto err_root;
266 udc->debugfs_root = root;
267
268 regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
269 CTRL_IOMEM_ID);
270
271 if (regs_resource) {
272 regs = debugfs_create_file_size("regs", 0400, root, udc,
273 &regs_dbg_fops,
274 resource_size(regs_resource));
275 if (!regs)
276 goto err_regs;
277 udc->debugfs_regs = regs;
278 }
279
280 usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
281
282 return;
283
284 err_regs:
285 debugfs_remove(root);
286 err_root:
287 udc->debugfs_root = NULL;
288 dev_err(&udc->pdev->dev, "debugfs is not available\n");
289 }
290
291 static void usba_cleanup_debugfs(struct usba_udc *udc)
292 {
293 usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
294 debugfs_remove(udc->debugfs_regs);
295 debugfs_remove(udc->debugfs_root);
296 udc->debugfs_regs = NULL;
297 udc->debugfs_root = NULL;
298 }
299 #else
300 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
301 struct usba_ep *ep)
302 {
303
304 }
305
306 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
307 {
308
309 }
310
311 static inline void usba_init_debugfs(struct usba_udc *udc)
312 {
313
314 }
315
316 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
317 {
318
319 }
320 #endif
321
322 static inline u32 usba_int_enb_get(struct usba_udc *udc)
323 {
324 return udc->int_enb_cache;
325 }
326
327 static inline void usba_int_enb_set(struct usba_udc *udc, u32 val)
328 {
329 usba_writel(udc, INT_ENB, val);
330 udc->int_enb_cache = val;
331 }
332
333 static int vbus_is_present(struct usba_udc *udc)
334 {
335 if (gpio_is_valid(udc->vbus_pin))
336 return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
337
338 /* No Vbus detection: Assume always present */
339 return 1;
340 }
341
342 static void toggle_bias(struct usba_udc *udc, int is_on)
343 {
344 if (udc->errata && udc->errata->toggle_bias)
345 udc->errata->toggle_bias(udc, is_on);
346 }
347
348 static void generate_bias_pulse(struct usba_udc *udc)
349 {
350 if (!udc->bias_pulse_needed)
351 return;
352
353 if (udc->errata && udc->errata->pulse_bias)
354 udc->errata->pulse_bias(udc);
355
356 udc->bias_pulse_needed = false;
357 }
358
359 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
360 {
361 unsigned int transaction_len;
362
363 transaction_len = req->req.length - req->req.actual;
364 req->last_transaction = 1;
365 if (transaction_len > ep->ep.maxpacket) {
366 transaction_len = ep->ep.maxpacket;
367 req->last_transaction = 0;
368 } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
369 req->last_transaction = 0;
370
371 DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
372 ep->ep.name, req, transaction_len,
373 req->last_transaction ? ", done" : "");
374
375 memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
376 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
377 req->req.actual += transaction_len;
378 }
379
380 static void submit_request(struct usba_ep *ep, struct usba_request *req)
381 {
382 DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
383 ep->ep.name, req, req->req.length);
384
385 req->req.actual = 0;
386 req->submitted = 1;
387
388 if (req->using_dma) {
389 if (req->req.length == 0) {
390 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
391 return;
392 }
393
394 if (req->req.zero)
395 usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
396 else
397 usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
398
399 usba_dma_writel(ep, ADDRESS, req->req.dma);
400 usba_dma_writel(ep, CONTROL, req->ctrl);
401 } else {
402 next_fifo_transaction(ep, req);
403 if (req->last_transaction) {
404 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
405 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
406 } else {
407 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
408 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
409 }
410 }
411 }
412
413 static void submit_next_request(struct usba_ep *ep)
414 {
415 struct usba_request *req;
416
417 if (list_empty(&ep->queue)) {
418 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
419 return;
420 }
421
422 req = list_entry(ep->queue.next, struct usba_request, queue);
423 if (!req->submitted)
424 submit_request(ep, req);
425 }
426
427 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
428 {
429 ep->state = STATUS_STAGE_IN;
430 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
431 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
432 }
433
434 static void receive_data(struct usba_ep *ep)
435 {
436 struct usba_udc *udc = ep->udc;
437 struct usba_request *req;
438 unsigned long status;
439 unsigned int bytecount, nr_busy;
440 int is_complete = 0;
441
442 status = usba_ep_readl(ep, STA);
443 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
444
445 DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
446
447 while (nr_busy > 0) {
448 if (list_empty(&ep->queue)) {
449 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
450 break;
451 }
452 req = list_entry(ep->queue.next,
453 struct usba_request, queue);
454
455 bytecount = USBA_BFEXT(BYTE_COUNT, status);
456
457 if (status & (1 << 31))
458 is_complete = 1;
459 if (req->req.actual + bytecount >= req->req.length) {
460 is_complete = 1;
461 bytecount = req->req.length - req->req.actual;
462 }
463
464 memcpy_fromio(req->req.buf + req->req.actual,
465 ep->fifo, bytecount);
466 req->req.actual += bytecount;
467
468 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
469
470 if (is_complete) {
471 DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
472 req->req.status = 0;
473 list_del_init(&req->queue);
474 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
475 spin_unlock(&udc->lock);
476 usb_gadget_giveback_request(&ep->ep, &req->req);
477 spin_lock(&udc->lock);
478 }
479
480 status = usba_ep_readl(ep, STA);
481 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
482
483 if (is_complete && ep_is_control(ep)) {
484 send_status(udc, ep);
485 break;
486 }
487 }
488 }
489
490 static void
491 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
492 {
493 struct usba_udc *udc = ep->udc;
494
495 WARN_ON(!list_empty(&req->queue));
496
497 if (req->req.status == -EINPROGRESS)
498 req->req.status = status;
499
500 if (req->using_dma)
501 usb_gadget_unmap_request(&udc->gadget, &req->req, ep->is_in);
502
503 DBG(DBG_GADGET | DBG_REQ,
504 "%s: req %p complete: status %d, actual %u\n",
505 ep->ep.name, req, req->req.status, req->req.actual);
506
507 spin_unlock(&udc->lock);
508 usb_gadget_giveback_request(&ep->ep, &req->req);
509 spin_lock(&udc->lock);
510 }
511
512 static void
513 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
514 {
515 struct usba_request *req, *tmp_req;
516
517 list_for_each_entry_safe(req, tmp_req, list, queue) {
518 list_del_init(&req->queue);
519 request_complete(ep, req, status);
520 }
521 }
522
523 static int
524 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
525 {
526 struct usba_ep *ep = to_usba_ep(_ep);
527 struct usba_udc *udc = ep->udc;
528 unsigned long flags, ept_cfg, maxpacket;
529 unsigned int nr_trans;
530
531 DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
532
533 maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
534
535 if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
536 || ep->index == 0
537 || desc->bDescriptorType != USB_DT_ENDPOINT
538 || maxpacket == 0
539 || maxpacket > ep->fifo_size) {
540 DBG(DBG_ERR, "ep_enable: Invalid argument");
541 return -EINVAL;
542 }
543
544 ep->is_isoc = 0;
545 ep->is_in = 0;
546
547 if (maxpacket <= 8)
548 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
549 else
550 /* LSB is bit 1, not 0 */
551 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
552
553 DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
554 ep->ep.name, ept_cfg, maxpacket);
555
556 if (usb_endpoint_dir_in(desc)) {
557 ep->is_in = 1;
558 ept_cfg |= USBA_EPT_DIR_IN;
559 }
560
561 switch (usb_endpoint_type(desc)) {
562 case USB_ENDPOINT_XFER_CONTROL:
563 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
564 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
565 break;
566 case USB_ENDPOINT_XFER_ISOC:
567 if (!ep->can_isoc) {
568 DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
569 ep->ep.name);
570 return -EINVAL;
571 }
572
573 /*
574 * Bits 11:12 specify number of _additional_
575 * transactions per microframe.
576 */
577 nr_trans = ((usb_endpoint_maxp(desc) >> 11) & 3) + 1;
578 if (nr_trans > 3)
579 return -EINVAL;
580
581 ep->is_isoc = 1;
582 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
583
584 /*
585 * Do triple-buffering on high-bandwidth iso endpoints.
586 */
587 if (nr_trans > 1 && ep->nr_banks == 3)
588 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
589 else
590 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
591 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
592 break;
593 case USB_ENDPOINT_XFER_BULK:
594 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
595 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
596 break;
597 case USB_ENDPOINT_XFER_INT:
598 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
599 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
600 break;
601 }
602
603 spin_lock_irqsave(&ep->udc->lock, flags);
604
605 ep->ep.desc = desc;
606 ep->ep.maxpacket = maxpacket;
607
608 usba_ep_writel(ep, CFG, ept_cfg);
609 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
610
611 if (ep->can_dma) {
612 u32 ctrl;
613
614 usba_int_enb_set(udc, usba_int_enb_get(udc) |
615 USBA_BF(EPT_INT, 1 << ep->index) |
616 USBA_BF(DMA_INT, 1 << ep->index));
617 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
618 usba_ep_writel(ep, CTL_ENB, ctrl);
619 } else {
620 usba_int_enb_set(udc, usba_int_enb_get(udc) |
621 USBA_BF(EPT_INT, 1 << ep->index));
622 }
623
624 spin_unlock_irqrestore(&udc->lock, flags);
625
626 DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
627 (unsigned long)usba_ep_readl(ep, CFG));
628 DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
629 (unsigned long)usba_int_enb_get(udc));
630
631 return 0;
632 }
633
634 static int usba_ep_disable(struct usb_ep *_ep)
635 {
636 struct usba_ep *ep = to_usba_ep(_ep);
637 struct usba_udc *udc = ep->udc;
638 LIST_HEAD(req_list);
639 unsigned long flags;
640
641 DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
642
643 spin_lock_irqsave(&udc->lock, flags);
644
645 if (!ep->ep.desc) {
646 spin_unlock_irqrestore(&udc->lock, flags);
647 /* REVISIT because this driver disables endpoints in
648 * reset_all_endpoints() before calling disconnect(),
649 * most gadget drivers would trigger this non-error ...
650 */
651 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
652 DBG(DBG_ERR, "ep_disable: %s not enabled\n",
653 ep->ep.name);
654 return -EINVAL;
655 }
656 ep->ep.desc = NULL;
657
658 list_splice_init(&ep->queue, &req_list);
659 if (ep->can_dma) {
660 usba_dma_writel(ep, CONTROL, 0);
661 usba_dma_writel(ep, ADDRESS, 0);
662 usba_dma_readl(ep, STATUS);
663 }
664 usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
665 usba_int_enb_set(udc, usba_int_enb_get(udc) &
666 ~USBA_BF(EPT_INT, 1 << ep->index));
667
668 request_complete_list(ep, &req_list, -ESHUTDOWN);
669
670 spin_unlock_irqrestore(&udc->lock, flags);
671
672 return 0;
673 }
674
675 static struct usb_request *
676 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
677 {
678 struct usba_request *req;
679
680 DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
681
682 req = kzalloc(sizeof(*req), gfp_flags);
683 if (!req)
684 return NULL;
685
686 INIT_LIST_HEAD(&req->queue);
687
688 return &req->req;
689 }
690
691 static void
692 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
693 {
694 struct usba_request *req = to_usba_req(_req);
695
696 DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
697
698 kfree(req);
699 }
700
701 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
702 struct usba_request *req, gfp_t gfp_flags)
703 {
704 unsigned long flags;
705 int ret;
706
707 DBG(DBG_DMA, "%s: req l/%u d/%pad %c%c%c\n",
708 ep->ep.name, req->req.length, &req->req.dma,
709 req->req.zero ? 'Z' : 'z',
710 req->req.short_not_ok ? 'S' : 's',
711 req->req.no_interrupt ? 'I' : 'i');
712
713 if (req->req.length > 0x10000) {
714 /* Lengths from 0 to 65536 (inclusive) are supported */
715 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
716 return -EINVAL;
717 }
718
719 ret = usb_gadget_map_request(&udc->gadget, &req->req, ep->is_in);
720 if (ret)
721 return ret;
722
723 req->using_dma = 1;
724 req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
725 | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
726 | USBA_DMA_END_BUF_EN;
727
728 if (!ep->is_in)
729 req->ctrl |= USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
730
731 /*
732 * Add this request to the queue and submit for DMA if
733 * possible. Check if we're still alive first -- we may have
734 * received a reset since last time we checked.
735 */
736 ret = -ESHUTDOWN;
737 spin_lock_irqsave(&udc->lock, flags);
738 if (ep->ep.desc) {
739 if (list_empty(&ep->queue))
740 submit_request(ep, req);
741
742 list_add_tail(&req->queue, &ep->queue);
743 ret = 0;
744 }
745 spin_unlock_irqrestore(&udc->lock, flags);
746
747 return ret;
748 }
749
750 static int
751 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
752 {
753 struct usba_request *req = to_usba_req(_req);
754 struct usba_ep *ep = to_usba_ep(_ep);
755 struct usba_udc *udc = ep->udc;
756 unsigned long flags;
757 int ret;
758
759 DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
760 ep->ep.name, req, _req->length);
761
762 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
763 !ep->ep.desc)
764 return -ESHUTDOWN;
765
766 req->submitted = 0;
767 req->using_dma = 0;
768 req->last_transaction = 0;
769
770 _req->status = -EINPROGRESS;
771 _req->actual = 0;
772
773 if (ep->can_dma)
774 return queue_dma(udc, ep, req, gfp_flags);
775
776 /* May have received a reset since last time we checked */
777 ret = -ESHUTDOWN;
778 spin_lock_irqsave(&udc->lock, flags);
779 if (ep->ep.desc) {
780 list_add_tail(&req->queue, &ep->queue);
781
782 if ((!ep_is_control(ep) && ep->is_in) ||
783 (ep_is_control(ep)
784 && (ep->state == DATA_STAGE_IN
785 || ep->state == STATUS_STAGE_IN)))
786 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
787 else
788 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
789 ret = 0;
790 }
791 spin_unlock_irqrestore(&udc->lock, flags);
792
793 return ret;
794 }
795
796 static void
797 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
798 {
799 req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
800 }
801
802 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
803 {
804 unsigned int timeout;
805 u32 status;
806
807 /*
808 * Stop the DMA controller. When writing both CH_EN
809 * and LINK to 0, the other bits are not affected.
810 */
811 usba_dma_writel(ep, CONTROL, 0);
812
813 /* Wait for the FIFO to empty */
814 for (timeout = 40; timeout; --timeout) {
815 status = usba_dma_readl(ep, STATUS);
816 if (!(status & USBA_DMA_CH_EN))
817 break;
818 udelay(1);
819 }
820
821 if (pstatus)
822 *pstatus = status;
823
824 if (timeout == 0) {
825 dev_err(&ep->udc->pdev->dev,
826 "%s: timed out waiting for DMA FIFO to empty\n",
827 ep->ep.name);
828 return -ETIMEDOUT;
829 }
830
831 return 0;
832 }
833
834 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
835 {
836 struct usba_ep *ep = to_usba_ep(_ep);
837 struct usba_udc *udc = ep->udc;
838 struct usba_request *req;
839 unsigned long flags;
840 u32 status;
841
842 DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
843 ep->ep.name, req);
844
845 spin_lock_irqsave(&udc->lock, flags);
846
847 list_for_each_entry(req, &ep->queue, queue) {
848 if (&req->req == _req)
849 break;
850 }
851
852 if (&req->req != _req) {
853 spin_unlock_irqrestore(&udc->lock, flags);
854 return -EINVAL;
855 }
856
857 if (req->using_dma) {
858 /*
859 * If this request is currently being transferred,
860 * stop the DMA controller and reset the FIFO.
861 */
862 if (ep->queue.next == &req->queue) {
863 status = usba_dma_readl(ep, STATUS);
864 if (status & USBA_DMA_CH_EN)
865 stop_dma(ep, &status);
866
867 #ifdef CONFIG_USB_GADGET_DEBUG_FS
868 ep->last_dma_status = status;
869 #endif
870
871 usba_writel(udc, EPT_RST, 1 << ep->index);
872
873 usba_update_req(ep, req, status);
874 }
875 }
876
877 /*
878 * Errors should stop the queue from advancing until the
879 * completion function returns.
880 */
881 list_del_init(&req->queue);
882
883 request_complete(ep, req, -ECONNRESET);
884
885 /* Process the next request if any */
886 submit_next_request(ep);
887 spin_unlock_irqrestore(&udc->lock, flags);
888
889 return 0;
890 }
891
892 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
893 {
894 struct usba_ep *ep = to_usba_ep(_ep);
895 struct usba_udc *udc = ep->udc;
896 unsigned long flags;
897 int ret = 0;
898
899 DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
900 value ? "set" : "clear");
901
902 if (!ep->ep.desc) {
903 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
904 ep->ep.name);
905 return -ENODEV;
906 }
907 if (ep->is_isoc) {
908 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
909 ep->ep.name);
910 return -ENOTTY;
911 }
912
913 spin_lock_irqsave(&udc->lock, flags);
914
915 /*
916 * We can't halt IN endpoints while there are still data to be
917 * transferred
918 */
919 if (!list_empty(&ep->queue)
920 || ((value && ep->is_in && (usba_ep_readl(ep, STA)
921 & USBA_BF(BUSY_BANKS, -1L))))) {
922 ret = -EAGAIN;
923 } else {
924 if (value)
925 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
926 else
927 usba_ep_writel(ep, CLR_STA,
928 USBA_FORCE_STALL | USBA_TOGGLE_CLR);
929 usba_ep_readl(ep, STA);
930 }
931
932 spin_unlock_irqrestore(&udc->lock, flags);
933
934 return ret;
935 }
936
937 static int usba_ep_fifo_status(struct usb_ep *_ep)
938 {
939 struct usba_ep *ep = to_usba_ep(_ep);
940
941 return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
942 }
943
944 static void usba_ep_fifo_flush(struct usb_ep *_ep)
945 {
946 struct usba_ep *ep = to_usba_ep(_ep);
947 struct usba_udc *udc = ep->udc;
948
949 usba_writel(udc, EPT_RST, 1 << ep->index);
950 }
951
952 static const struct usb_ep_ops usba_ep_ops = {
953 .enable = usba_ep_enable,
954 .disable = usba_ep_disable,
955 .alloc_request = usba_ep_alloc_request,
956 .free_request = usba_ep_free_request,
957 .queue = usba_ep_queue,
958 .dequeue = usba_ep_dequeue,
959 .set_halt = usba_ep_set_halt,
960 .fifo_status = usba_ep_fifo_status,
961 .fifo_flush = usba_ep_fifo_flush,
962 };
963
964 static int usba_udc_get_frame(struct usb_gadget *gadget)
965 {
966 struct usba_udc *udc = to_usba_udc(gadget);
967
968 return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
969 }
970
971 static int usba_udc_wakeup(struct usb_gadget *gadget)
972 {
973 struct usba_udc *udc = to_usba_udc(gadget);
974 unsigned long flags;
975 u32 ctrl;
976 int ret = -EINVAL;
977
978 spin_lock_irqsave(&udc->lock, flags);
979 if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
980 ctrl = usba_readl(udc, CTRL);
981 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
982 ret = 0;
983 }
984 spin_unlock_irqrestore(&udc->lock, flags);
985
986 return ret;
987 }
988
989 static int
990 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
991 {
992 struct usba_udc *udc = to_usba_udc(gadget);
993 unsigned long flags;
994
995 gadget->is_selfpowered = (is_selfpowered != 0);
996 spin_lock_irqsave(&udc->lock, flags);
997 if (is_selfpowered)
998 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
999 else
1000 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1001 spin_unlock_irqrestore(&udc->lock, flags);
1002
1003 return 0;
1004 }
1005
1006 static int atmel_usba_start(struct usb_gadget *gadget,
1007 struct usb_gadget_driver *driver);
1008 static int atmel_usba_stop(struct usb_gadget *gadget);
1009
1010 static const struct usb_gadget_ops usba_udc_ops = {
1011 .get_frame = usba_udc_get_frame,
1012 .wakeup = usba_udc_wakeup,
1013 .set_selfpowered = usba_udc_set_selfpowered,
1014 .udc_start = atmel_usba_start,
1015 .udc_stop = atmel_usba_stop,
1016 };
1017
1018 static struct usb_endpoint_descriptor usba_ep0_desc = {
1019 .bLength = USB_DT_ENDPOINT_SIZE,
1020 .bDescriptorType = USB_DT_ENDPOINT,
1021 .bEndpointAddress = 0,
1022 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1023 .wMaxPacketSize = cpu_to_le16(64),
1024 /* FIXME: I have no idea what to put here */
1025 .bInterval = 1,
1026 };
1027
1028 static struct usb_gadget usba_gadget_template = {
1029 .ops = &usba_udc_ops,
1030 .max_speed = USB_SPEED_HIGH,
1031 .name = "atmel_usba_udc",
1032 };
1033
1034 /*
1035 * Called with interrupts disabled and udc->lock held.
1036 */
1037 static void reset_all_endpoints(struct usba_udc *udc)
1038 {
1039 struct usba_ep *ep;
1040 struct usba_request *req, *tmp_req;
1041
1042 usba_writel(udc, EPT_RST, ~0UL);
1043
1044 ep = to_usba_ep(udc->gadget.ep0);
1045 list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1046 list_del_init(&req->queue);
1047 request_complete(ep, req, -ECONNRESET);
1048 }
1049
1050 /* NOTE: normally, the next call to the gadget driver is in
1051 * charge of disabling endpoints... usually disconnect().
1052 * The exception would be entering a high speed test mode.
1053 *
1054 * FIXME remove this code ... and retest thoroughly.
1055 */
1056 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1057 if (ep->ep.desc) {
1058 spin_unlock(&udc->lock);
1059 usba_ep_disable(&ep->ep);
1060 spin_lock(&udc->lock);
1061 }
1062 }
1063 }
1064
1065 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1066 {
1067 struct usba_ep *ep;
1068
1069 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1070 return to_usba_ep(udc->gadget.ep0);
1071
1072 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1073 u8 bEndpointAddress;
1074
1075 if (!ep->ep.desc)
1076 continue;
1077 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1078 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1079 continue;
1080 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1081 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1082 return ep;
1083 }
1084
1085 return NULL;
1086 }
1087
1088 /* Called with interrupts disabled and udc->lock held */
1089 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1090 {
1091 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1092 ep->state = WAIT_FOR_SETUP;
1093 }
1094
1095 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1096 {
1097 if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1098 return 1;
1099 return 0;
1100 }
1101
1102 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1103 {
1104 u32 regval;
1105
1106 DBG(DBG_BUS, "setting address %u...\n", addr);
1107 regval = usba_readl(udc, CTRL);
1108 regval = USBA_BFINS(DEV_ADDR, addr, regval);
1109 usba_writel(udc, CTRL, regval);
1110 }
1111
1112 static int do_test_mode(struct usba_udc *udc)
1113 {
1114 static const char test_packet_buffer[] = {
1115 /* JKJKJKJK * 9 */
1116 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1117 /* JJKKJJKK * 8 */
1118 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1119 /* JJKKJJKK * 8 */
1120 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1121 /* JJJJJJJKKKKKKK * 8 */
1122 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1123 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1124 /* JJJJJJJK * 8 */
1125 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1126 /* {JKKKKKKK * 10}, JK */
1127 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1128 };
1129 struct usba_ep *ep;
1130 struct device *dev = &udc->pdev->dev;
1131 int test_mode;
1132
1133 test_mode = udc->test_mode;
1134
1135 /* Start from a clean slate */
1136 reset_all_endpoints(udc);
1137
1138 switch (test_mode) {
1139 case 0x0100:
1140 /* Test_J */
1141 usba_writel(udc, TST, USBA_TST_J_MODE);
1142 dev_info(dev, "Entering Test_J mode...\n");
1143 break;
1144 case 0x0200:
1145 /* Test_K */
1146 usba_writel(udc, TST, USBA_TST_K_MODE);
1147 dev_info(dev, "Entering Test_K mode...\n");
1148 break;
1149 case 0x0300:
1150 /*
1151 * Test_SE0_NAK: Force high-speed mode and set up ep0
1152 * for Bulk IN transfers
1153 */
1154 ep = &udc->usba_ep[0];
1155 usba_writel(udc, TST,
1156 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1157 usba_ep_writel(ep, CFG,
1158 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1159 | USBA_EPT_DIR_IN
1160 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1161 | USBA_BF(BK_NUMBER, 1));
1162 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1163 set_protocol_stall(udc, ep);
1164 dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1165 } else {
1166 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1167 dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1168 }
1169 break;
1170 case 0x0400:
1171 /* Test_Packet */
1172 ep = &udc->usba_ep[0];
1173 usba_ep_writel(ep, CFG,
1174 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1175 | USBA_EPT_DIR_IN
1176 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1177 | USBA_BF(BK_NUMBER, 1));
1178 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1179 set_protocol_stall(udc, ep);
1180 dev_err(dev, "Test_Packet: ep0 not mapped\n");
1181 } else {
1182 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1183 usba_writel(udc, TST, USBA_TST_PKT_MODE);
1184 memcpy_toio(ep->fifo, test_packet_buffer,
1185 sizeof(test_packet_buffer));
1186 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1187 dev_info(dev, "Entering Test_Packet mode...\n");
1188 }
1189 break;
1190 default:
1191 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1192 return -EINVAL;
1193 }
1194
1195 return 0;
1196 }
1197
1198 /* Avoid overly long expressions */
1199 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1200 {
1201 if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1202 return true;
1203 return false;
1204 }
1205
1206 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1207 {
1208 if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1209 return true;
1210 return false;
1211 }
1212
1213 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1214 {
1215 if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1216 return true;
1217 return false;
1218 }
1219
1220 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1221 struct usb_ctrlrequest *crq)
1222 {
1223 int retval = 0;
1224
1225 switch (crq->bRequest) {
1226 case USB_REQ_GET_STATUS: {
1227 u16 status;
1228
1229 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1230 status = cpu_to_le16(udc->devstatus);
1231 } else if (crq->bRequestType
1232 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1233 status = cpu_to_le16(0);
1234 } else if (crq->bRequestType
1235 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1236 struct usba_ep *target;
1237
1238 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1239 if (!target)
1240 goto stall;
1241
1242 status = 0;
1243 if (is_stalled(udc, target))
1244 status |= cpu_to_le16(1);
1245 } else
1246 goto delegate;
1247
1248 /* Write directly to the FIFO. No queueing is done. */
1249 if (crq->wLength != cpu_to_le16(sizeof(status)))
1250 goto stall;
1251 ep->state = DATA_STAGE_IN;
1252 usba_io_writew(status, ep->fifo);
1253 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1254 break;
1255 }
1256
1257 case USB_REQ_CLEAR_FEATURE: {
1258 if (crq->bRequestType == USB_RECIP_DEVICE) {
1259 if (feature_is_dev_remote_wakeup(crq))
1260 udc->devstatus
1261 &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1262 else
1263 /* Can't CLEAR_FEATURE TEST_MODE */
1264 goto stall;
1265 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1266 struct usba_ep *target;
1267
1268 if (crq->wLength != cpu_to_le16(0)
1269 || !feature_is_ep_halt(crq))
1270 goto stall;
1271 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1272 if (!target)
1273 goto stall;
1274
1275 usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1276 if (target->index != 0)
1277 usba_ep_writel(target, CLR_STA,
1278 USBA_TOGGLE_CLR);
1279 } else {
1280 goto delegate;
1281 }
1282
1283 send_status(udc, ep);
1284 break;
1285 }
1286
1287 case USB_REQ_SET_FEATURE: {
1288 if (crq->bRequestType == USB_RECIP_DEVICE) {
1289 if (feature_is_dev_test_mode(crq)) {
1290 send_status(udc, ep);
1291 ep->state = STATUS_STAGE_TEST;
1292 udc->test_mode = le16_to_cpu(crq->wIndex);
1293 return 0;
1294 } else if (feature_is_dev_remote_wakeup(crq)) {
1295 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1296 } else {
1297 goto stall;
1298 }
1299 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1300 struct usba_ep *target;
1301
1302 if (crq->wLength != cpu_to_le16(0)
1303 || !feature_is_ep_halt(crq))
1304 goto stall;
1305
1306 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1307 if (!target)
1308 goto stall;
1309
1310 usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1311 } else
1312 goto delegate;
1313
1314 send_status(udc, ep);
1315 break;
1316 }
1317
1318 case USB_REQ_SET_ADDRESS:
1319 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1320 goto delegate;
1321
1322 set_address(udc, le16_to_cpu(crq->wValue));
1323 send_status(udc, ep);
1324 ep->state = STATUS_STAGE_ADDR;
1325 break;
1326
1327 default:
1328 delegate:
1329 spin_unlock(&udc->lock);
1330 retval = udc->driver->setup(&udc->gadget, crq);
1331 spin_lock(&udc->lock);
1332 }
1333
1334 return retval;
1335
1336 stall:
1337 pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1338 "halting endpoint...\n",
1339 ep->ep.name, crq->bRequestType, crq->bRequest,
1340 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1341 le16_to_cpu(crq->wLength));
1342 set_protocol_stall(udc, ep);
1343 return -1;
1344 }
1345
1346 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1347 {
1348 struct usba_request *req;
1349 u32 epstatus;
1350 u32 epctrl;
1351
1352 restart:
1353 epstatus = usba_ep_readl(ep, STA);
1354 epctrl = usba_ep_readl(ep, CTL);
1355
1356 DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1357 ep->ep.name, ep->state, epstatus, epctrl);
1358
1359 req = NULL;
1360 if (!list_empty(&ep->queue))
1361 req = list_entry(ep->queue.next,
1362 struct usba_request, queue);
1363
1364 if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1365 if (req->submitted)
1366 next_fifo_transaction(ep, req);
1367 else
1368 submit_request(ep, req);
1369
1370 if (req->last_transaction) {
1371 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1372 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1373 }
1374 goto restart;
1375 }
1376 if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1377 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1378
1379 switch (ep->state) {
1380 case DATA_STAGE_IN:
1381 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1382 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1383 ep->state = STATUS_STAGE_OUT;
1384 break;
1385 case STATUS_STAGE_ADDR:
1386 /* Activate our new address */
1387 usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1388 | USBA_FADDR_EN));
1389 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1390 ep->state = WAIT_FOR_SETUP;
1391 break;
1392 case STATUS_STAGE_IN:
1393 if (req) {
1394 list_del_init(&req->queue);
1395 request_complete(ep, req, 0);
1396 submit_next_request(ep);
1397 }
1398 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1399 ep->state = WAIT_FOR_SETUP;
1400 break;
1401 case STATUS_STAGE_TEST:
1402 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1403 ep->state = WAIT_FOR_SETUP;
1404 if (do_test_mode(udc))
1405 set_protocol_stall(udc, ep);
1406 break;
1407 default:
1408 pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1409 "halting endpoint...\n",
1410 ep->ep.name, ep->state);
1411 set_protocol_stall(udc, ep);
1412 break;
1413 }
1414
1415 goto restart;
1416 }
1417 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1418 switch (ep->state) {
1419 case STATUS_STAGE_OUT:
1420 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1421 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1422
1423 if (req) {
1424 list_del_init(&req->queue);
1425 request_complete(ep, req, 0);
1426 }
1427 ep->state = WAIT_FOR_SETUP;
1428 break;
1429
1430 case DATA_STAGE_OUT:
1431 receive_data(ep);
1432 break;
1433
1434 default:
1435 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1436 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1437 pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1438 "halting endpoint...\n",
1439 ep->ep.name, ep->state);
1440 set_protocol_stall(udc, ep);
1441 break;
1442 }
1443
1444 goto restart;
1445 }
1446 if (epstatus & USBA_RX_SETUP) {
1447 union {
1448 struct usb_ctrlrequest crq;
1449 unsigned long data[2];
1450 } crq;
1451 unsigned int pkt_len;
1452 int ret;
1453
1454 if (ep->state != WAIT_FOR_SETUP) {
1455 /*
1456 * Didn't expect a SETUP packet at this
1457 * point. Clean up any pending requests (which
1458 * may be successful).
1459 */
1460 int status = -EPROTO;
1461
1462 /*
1463 * RXRDY and TXCOMP are dropped when SETUP
1464 * packets arrive. Just pretend we received
1465 * the status packet.
1466 */
1467 if (ep->state == STATUS_STAGE_OUT
1468 || ep->state == STATUS_STAGE_IN) {
1469 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1470 status = 0;
1471 }
1472
1473 if (req) {
1474 list_del_init(&req->queue);
1475 request_complete(ep, req, status);
1476 }
1477 }
1478
1479 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1480 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1481 if (pkt_len != sizeof(crq)) {
1482 pr_warning("udc: Invalid packet length %u "
1483 "(expected %zu)\n", pkt_len, sizeof(crq));
1484 set_protocol_stall(udc, ep);
1485 return;
1486 }
1487
1488 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1489 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1490
1491 /* Free up one bank in the FIFO so that we can
1492 * generate or receive a reply right away. */
1493 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1494
1495 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1496 ep->state, crq.crq.bRequestType,
1497 crq.crq.bRequest); */
1498
1499 if (crq.crq.bRequestType & USB_DIR_IN) {
1500 /*
1501 * The USB 2.0 spec states that "if wLength is
1502 * zero, there is no data transfer phase."
1503 * However, testusb #14 seems to actually
1504 * expect a data phase even if wLength = 0...
1505 */
1506 ep->state = DATA_STAGE_IN;
1507 } else {
1508 if (crq.crq.wLength != cpu_to_le16(0))
1509 ep->state = DATA_STAGE_OUT;
1510 else
1511 ep->state = STATUS_STAGE_IN;
1512 }
1513
1514 ret = -1;
1515 if (ep->index == 0)
1516 ret = handle_ep0_setup(udc, ep, &crq.crq);
1517 else {
1518 spin_unlock(&udc->lock);
1519 ret = udc->driver->setup(&udc->gadget, &crq.crq);
1520 spin_lock(&udc->lock);
1521 }
1522
1523 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1524 crq.crq.bRequestType, crq.crq.bRequest,
1525 le16_to_cpu(crq.crq.wLength), ep->state, ret);
1526
1527 if (ret < 0) {
1528 /* Let the host know that we failed */
1529 set_protocol_stall(udc, ep);
1530 }
1531 }
1532 }
1533
1534 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1535 {
1536 struct usba_request *req;
1537 u32 epstatus;
1538 u32 epctrl;
1539
1540 epstatus = usba_ep_readl(ep, STA);
1541 epctrl = usba_ep_readl(ep, CTL);
1542
1543 DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1544
1545 while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1546 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1547
1548 if (list_empty(&ep->queue)) {
1549 dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1550 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1551 return;
1552 }
1553
1554 req = list_entry(ep->queue.next, struct usba_request, queue);
1555
1556 if (req->using_dma) {
1557 /* Send a zero-length packet */
1558 usba_ep_writel(ep, SET_STA,
1559 USBA_TX_PK_RDY);
1560 usba_ep_writel(ep, CTL_DIS,
1561 USBA_TX_PK_RDY);
1562 list_del_init(&req->queue);
1563 submit_next_request(ep);
1564 request_complete(ep, req, 0);
1565 } else {
1566 if (req->submitted)
1567 next_fifo_transaction(ep, req);
1568 else
1569 submit_request(ep, req);
1570
1571 if (req->last_transaction) {
1572 list_del_init(&req->queue);
1573 submit_next_request(ep);
1574 request_complete(ep, req, 0);
1575 }
1576 }
1577
1578 epstatus = usba_ep_readl(ep, STA);
1579 epctrl = usba_ep_readl(ep, CTL);
1580 }
1581 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1582 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1583 receive_data(ep);
1584 }
1585 }
1586
1587 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1588 {
1589 struct usba_request *req;
1590 u32 status, control, pending;
1591
1592 status = usba_dma_readl(ep, STATUS);
1593 control = usba_dma_readl(ep, CONTROL);
1594 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1595 ep->last_dma_status = status;
1596 #endif
1597 pending = status & control;
1598 DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1599
1600 if (status & USBA_DMA_CH_EN) {
1601 dev_err(&udc->pdev->dev,
1602 "DMA_CH_EN is set after transfer is finished!\n");
1603 dev_err(&udc->pdev->dev,
1604 "status=%#08x, pending=%#08x, control=%#08x\n",
1605 status, pending, control);
1606
1607 /*
1608 * try to pretend nothing happened. We might have to
1609 * do something here...
1610 */
1611 }
1612
1613 if (list_empty(&ep->queue))
1614 /* Might happen if a reset comes along at the right moment */
1615 return;
1616
1617 if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1618 req = list_entry(ep->queue.next, struct usba_request, queue);
1619 usba_update_req(ep, req, status);
1620
1621 list_del_init(&req->queue);
1622 submit_next_request(ep);
1623 request_complete(ep, req, 0);
1624 }
1625 }
1626
1627 static irqreturn_t usba_udc_irq(int irq, void *devid)
1628 {
1629 struct usba_udc *udc = devid;
1630 u32 status, int_enb;
1631 u32 dma_status;
1632 u32 ep_status;
1633
1634 spin_lock(&udc->lock);
1635
1636 int_enb = usba_int_enb_get(udc);
1637 status = usba_readl(udc, INT_STA) & int_enb;
1638 DBG(DBG_INT, "irq, status=%#08x\n", status);
1639
1640 if (status & USBA_DET_SUSPEND) {
1641 toggle_bias(udc, 0);
1642 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1643 usba_int_enb_set(udc, int_enb | USBA_WAKE_UP);
1644 udc->bias_pulse_needed = true;
1645 DBG(DBG_BUS, "Suspend detected\n");
1646 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1647 && udc->driver && udc->driver->suspend) {
1648 spin_unlock(&udc->lock);
1649 udc->driver->suspend(&udc->gadget);
1650 spin_lock(&udc->lock);
1651 }
1652 }
1653
1654 if (status & USBA_WAKE_UP) {
1655 toggle_bias(udc, 1);
1656 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1657 usba_int_enb_set(udc, int_enb & ~USBA_WAKE_UP);
1658 DBG(DBG_BUS, "Wake Up CPU detected\n");
1659 }
1660
1661 if (status & USBA_END_OF_RESUME) {
1662 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1663 generate_bias_pulse(udc);
1664 DBG(DBG_BUS, "Resume detected\n");
1665 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1666 && udc->driver && udc->driver->resume) {
1667 spin_unlock(&udc->lock);
1668 udc->driver->resume(&udc->gadget);
1669 spin_lock(&udc->lock);
1670 }
1671 }
1672
1673 dma_status = USBA_BFEXT(DMA_INT, status);
1674 if (dma_status) {
1675 int i;
1676
1677 for (i = 1; i <= USBA_NR_DMAS; i++)
1678 if (dma_status & (1 << i))
1679 usba_dma_irq(udc, &udc->usba_ep[i]);
1680 }
1681
1682 ep_status = USBA_BFEXT(EPT_INT, status);
1683 if (ep_status) {
1684 int i;
1685
1686 for (i = 0; i < udc->num_ep; i++)
1687 if (ep_status & (1 << i)) {
1688 if (ep_is_control(&udc->usba_ep[i]))
1689 usba_control_irq(udc, &udc->usba_ep[i]);
1690 else
1691 usba_ep_irq(udc, &udc->usba_ep[i]);
1692 }
1693 }
1694
1695 if (status & USBA_END_OF_RESET) {
1696 struct usba_ep *ep0;
1697
1698 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1699 generate_bias_pulse(udc);
1700 reset_all_endpoints(udc);
1701
1702 if (udc->gadget.speed != USB_SPEED_UNKNOWN && udc->driver) {
1703 udc->gadget.speed = USB_SPEED_UNKNOWN;
1704 spin_unlock(&udc->lock);
1705 usb_gadget_udc_reset(&udc->gadget, udc->driver);
1706 spin_lock(&udc->lock);
1707 }
1708
1709 if (status & USBA_HIGH_SPEED)
1710 udc->gadget.speed = USB_SPEED_HIGH;
1711 else
1712 udc->gadget.speed = USB_SPEED_FULL;
1713 DBG(DBG_BUS, "%s bus reset detected\n",
1714 usb_speed_string(udc->gadget.speed));
1715
1716 ep0 = &udc->usba_ep[0];
1717 ep0->ep.desc = &usba_ep0_desc;
1718 ep0->state = WAIT_FOR_SETUP;
1719 usba_ep_writel(ep0, CFG,
1720 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1721 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1722 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1723 usba_ep_writel(ep0, CTL_ENB,
1724 USBA_EPT_ENABLE | USBA_RX_SETUP);
1725 usba_int_enb_set(udc, int_enb | USBA_BF(EPT_INT, 1) |
1726 USBA_DET_SUSPEND | USBA_END_OF_RESUME);
1727
1728 /*
1729 * Unclear why we hit this irregularly, e.g. in usbtest,
1730 * but it's clearly harmless...
1731 */
1732 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1733 dev_dbg(&udc->pdev->dev,
1734 "ODD: EP0 configuration is invalid!\n");
1735 }
1736
1737 spin_unlock(&udc->lock);
1738
1739 return IRQ_HANDLED;
1740 }
1741
1742 static int start_clock(struct usba_udc *udc)
1743 {
1744 int ret;
1745
1746 if (udc->clocked)
1747 return 0;
1748
1749 ret = clk_prepare_enable(udc->pclk);
1750 if (ret)
1751 return ret;
1752 ret = clk_prepare_enable(udc->hclk);
1753 if (ret) {
1754 clk_disable_unprepare(udc->pclk);
1755 return ret;
1756 }
1757
1758 udc->clocked = true;
1759 return 0;
1760 }
1761
1762 static void stop_clock(struct usba_udc *udc)
1763 {
1764 if (!udc->clocked)
1765 return;
1766
1767 clk_disable_unprepare(udc->hclk);
1768 clk_disable_unprepare(udc->pclk);
1769
1770 udc->clocked = false;
1771 }
1772
1773 static int usba_start(struct usba_udc *udc)
1774 {
1775 unsigned long flags;
1776 int ret;
1777
1778 ret = start_clock(udc);
1779 if (ret)
1780 return ret;
1781
1782 spin_lock_irqsave(&udc->lock, flags);
1783 toggle_bias(udc, 1);
1784 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1785 usba_int_enb_set(udc, USBA_END_OF_RESET);
1786 spin_unlock_irqrestore(&udc->lock, flags);
1787
1788 return 0;
1789 }
1790
1791 static void usba_stop(struct usba_udc *udc)
1792 {
1793 unsigned long flags;
1794
1795 spin_lock_irqsave(&udc->lock, flags);
1796 udc->gadget.speed = USB_SPEED_UNKNOWN;
1797 reset_all_endpoints(udc);
1798
1799 /* This will also disable the DP pullup */
1800 toggle_bias(udc, 0);
1801 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1802 spin_unlock_irqrestore(&udc->lock, flags);
1803
1804 stop_clock(udc);
1805 }
1806
1807 static irqreturn_t usba_vbus_irq_thread(int irq, void *devid)
1808 {
1809 struct usba_udc *udc = devid;
1810 int vbus;
1811
1812 /* debounce */
1813 udelay(10);
1814
1815 mutex_lock(&udc->vbus_mutex);
1816
1817 vbus = vbus_is_present(udc);
1818 if (vbus != udc->vbus_prev) {
1819 if (vbus) {
1820 usba_start(udc);
1821 } else {
1822 usba_stop(udc);
1823
1824 if (udc->driver->disconnect)
1825 udc->driver->disconnect(&udc->gadget);
1826 }
1827 udc->vbus_prev = vbus;
1828 }
1829
1830 mutex_unlock(&udc->vbus_mutex);
1831 return IRQ_HANDLED;
1832 }
1833
1834 static int atmel_usba_start(struct usb_gadget *gadget,
1835 struct usb_gadget_driver *driver)
1836 {
1837 int ret;
1838 struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1839 unsigned long flags;
1840
1841 spin_lock_irqsave(&udc->lock, flags);
1842 udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1843 udc->driver = driver;
1844 spin_unlock_irqrestore(&udc->lock, flags);
1845
1846 mutex_lock(&udc->vbus_mutex);
1847
1848 if (gpio_is_valid(udc->vbus_pin))
1849 enable_irq(gpio_to_irq(udc->vbus_pin));
1850
1851 /* If Vbus is present, enable the controller and wait for reset */
1852 udc->vbus_prev = vbus_is_present(udc);
1853 if (udc->vbus_prev) {
1854 ret = usba_start(udc);
1855 if (ret)
1856 goto err;
1857 }
1858
1859 mutex_unlock(&udc->vbus_mutex);
1860 return 0;
1861
1862 err:
1863 if (gpio_is_valid(udc->vbus_pin))
1864 disable_irq(gpio_to_irq(udc->vbus_pin));
1865
1866 mutex_unlock(&udc->vbus_mutex);
1867
1868 spin_lock_irqsave(&udc->lock, flags);
1869 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1870 udc->driver = NULL;
1871 spin_unlock_irqrestore(&udc->lock, flags);
1872 return ret;
1873 }
1874
1875 static int atmel_usba_stop(struct usb_gadget *gadget)
1876 {
1877 struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1878
1879 if (gpio_is_valid(udc->vbus_pin))
1880 disable_irq(gpio_to_irq(udc->vbus_pin));
1881
1882 usba_stop(udc);
1883
1884 udc->driver = NULL;
1885
1886 return 0;
1887 }
1888
1889 #ifdef CONFIG_OF
1890 static void at91sam9rl_toggle_bias(struct usba_udc *udc, int is_on)
1891 {
1892 unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
1893
1894 if (is_on)
1895 at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
1896 else
1897 at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
1898 }
1899
1900 static void at91sam9g45_pulse_bias(struct usba_udc *udc)
1901 {
1902 unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
1903
1904 at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
1905 at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
1906 }
1907
1908 static const struct usba_udc_errata at91sam9rl_errata = {
1909 .toggle_bias = at91sam9rl_toggle_bias,
1910 };
1911
1912 static const struct usba_udc_errata at91sam9g45_errata = {
1913 .pulse_bias = at91sam9g45_pulse_bias,
1914 };
1915
1916 static const struct of_device_id atmel_udc_dt_ids[] = {
1917 { .compatible = "atmel,at91sam9rl-udc", .data = &at91sam9rl_errata },
1918 { .compatible = "atmel,at91sam9g45-udc", .data = &at91sam9g45_errata },
1919 { .compatible = "atmel,sama5d3-udc" },
1920 { /* sentinel */ }
1921 };
1922
1923 MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
1924
1925 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1926 struct usba_udc *udc)
1927 {
1928 u32 val;
1929 const char *name;
1930 enum of_gpio_flags flags;
1931 struct device_node *np = pdev->dev.of_node;
1932 const struct of_device_id *match;
1933 struct device_node *pp;
1934 int i, ret;
1935 struct usba_ep *eps, *ep;
1936
1937 match = of_match_node(atmel_udc_dt_ids, np);
1938 if (!match)
1939 return ERR_PTR(-EINVAL);
1940
1941 udc->errata = match->data;
1942
1943 udc->num_ep = 0;
1944
1945 udc->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1946 &flags);
1947 udc->vbus_pin_inverted = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1948
1949 pp = NULL;
1950 while ((pp = of_get_next_child(np, pp)))
1951 udc->num_ep++;
1952
1953 eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * udc->num_ep,
1954 GFP_KERNEL);
1955 if (!eps)
1956 return ERR_PTR(-ENOMEM);
1957
1958 udc->gadget.ep0 = &eps[0].ep;
1959
1960 INIT_LIST_HEAD(&eps[0].ep.ep_list);
1961
1962 pp = NULL;
1963 i = 0;
1964 while ((pp = of_get_next_child(np, pp))) {
1965 ep = &eps[i];
1966
1967 ret = of_property_read_u32(pp, "reg", &val);
1968 if (ret) {
1969 dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
1970 goto err;
1971 }
1972 ep->index = val;
1973
1974 ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
1975 if (ret) {
1976 dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
1977 goto err;
1978 }
1979 ep->fifo_size = val;
1980
1981 ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
1982 if (ret) {
1983 dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
1984 goto err;
1985 }
1986 ep->nr_banks = val;
1987
1988 ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
1989 ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");
1990
1991 ret = of_property_read_string(pp, "name", &name);
1992 ep->ep.name = name;
1993
1994 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1995 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1996 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1997 ep->ep.ops = &usba_ep_ops;
1998 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
1999 ep->udc = udc;
2000 INIT_LIST_HEAD(&ep->queue);
2001
2002 if (i)
2003 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
2004
2005 i++;
2006 }
2007
2008 if (i == 0) {
2009 dev_err(&pdev->dev, "of_probe: no endpoint specified\n");
2010 ret = -EINVAL;
2011 goto err;
2012 }
2013
2014 return eps;
2015 err:
2016 return ERR_PTR(ret);
2017 }
2018 #else
2019 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
2020 struct usba_udc *udc)
2021 {
2022 return ERR_PTR(-ENOSYS);
2023 }
2024 #endif
2025
2026 static struct usba_ep * usba_udc_pdata(struct platform_device *pdev,
2027 struct usba_udc *udc)
2028 {
2029 struct usba_platform_data *pdata = dev_get_platdata(&pdev->dev);
2030 struct usba_ep *eps;
2031 int i;
2032
2033 if (!pdata)
2034 return ERR_PTR(-ENXIO);
2035
2036 eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * pdata->num_ep,
2037 GFP_KERNEL);
2038 if (!eps)
2039 return ERR_PTR(-ENOMEM);
2040
2041 udc->gadget.ep0 = &eps[0].ep;
2042
2043 udc->vbus_pin = pdata->vbus_pin;
2044 udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
2045 udc->num_ep = pdata->num_ep;
2046
2047 INIT_LIST_HEAD(&eps[0].ep.ep_list);
2048
2049 for (i = 0; i < pdata->num_ep; i++) {
2050 struct usba_ep *ep = &eps[i];
2051
2052 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
2053 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
2054 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
2055 ep->ep.ops = &usba_ep_ops;
2056 ep->ep.name = pdata->ep[i].name;
2057 ep->fifo_size = pdata->ep[i].fifo_size;
2058 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
2059 ep->udc = udc;
2060 INIT_LIST_HEAD(&ep->queue);
2061 ep->nr_banks = pdata->ep[i].nr_banks;
2062 ep->index = pdata->ep[i].index;
2063 ep->can_dma = pdata->ep[i].can_dma;
2064 ep->can_isoc = pdata->ep[i].can_isoc;
2065
2066 if (i)
2067 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
2068 }
2069
2070 return eps;
2071 }
2072
2073 static int usba_udc_probe(struct platform_device *pdev)
2074 {
2075 struct resource *regs, *fifo;
2076 struct clk *pclk, *hclk;
2077 struct usba_udc *udc;
2078 int irq, ret, i;
2079
2080 udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
2081 if (!udc)
2082 return -ENOMEM;
2083
2084 udc->gadget = usba_gadget_template;
2085 INIT_LIST_HEAD(&udc->gadget.ep_list);
2086
2087 regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
2088 fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
2089 if (!regs || !fifo)
2090 return -ENXIO;
2091
2092 irq = platform_get_irq(pdev, 0);
2093 if (irq < 0)
2094 return irq;
2095
2096 pclk = devm_clk_get(&pdev->dev, "pclk");
2097 if (IS_ERR(pclk))
2098 return PTR_ERR(pclk);
2099 hclk = devm_clk_get(&pdev->dev, "hclk");
2100 if (IS_ERR(hclk))
2101 return PTR_ERR(hclk);
2102
2103 spin_lock_init(&udc->lock);
2104 mutex_init(&udc->vbus_mutex);
2105 udc->pdev = pdev;
2106 udc->pclk = pclk;
2107 udc->hclk = hclk;
2108 udc->vbus_pin = -ENODEV;
2109
2110 ret = -ENOMEM;
2111 udc->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2112 if (!udc->regs) {
2113 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
2114 return ret;
2115 }
2116 dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
2117 (unsigned long)regs->start, udc->regs);
2118 udc->fifo = devm_ioremap(&pdev->dev, fifo->start, resource_size(fifo));
2119 if (!udc->fifo) {
2120 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
2121 return ret;
2122 }
2123 dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
2124 (unsigned long)fifo->start, udc->fifo);
2125
2126 platform_set_drvdata(pdev, udc);
2127
2128 /* Make sure we start from a clean slate */
2129 ret = clk_prepare_enable(pclk);
2130 if (ret) {
2131 dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
2132 return ret;
2133 }
2134
2135 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
2136 clk_disable_unprepare(pclk);
2137
2138 if (pdev->dev.of_node)
2139 udc->usba_ep = atmel_udc_of_init(pdev, udc);
2140 else
2141 udc->usba_ep = usba_udc_pdata(pdev, udc);
2142
2143 toggle_bias(udc, 0);
2144
2145 if (IS_ERR(udc->usba_ep))
2146 return PTR_ERR(udc->usba_ep);
2147
2148 ret = devm_request_irq(&pdev->dev, irq, usba_udc_irq, 0,
2149 "atmel_usba_udc", udc);
2150 if (ret) {
2151 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
2152 irq, ret);
2153 return ret;
2154 }
2155 udc->irq = irq;
2156
2157 if (gpio_is_valid(udc->vbus_pin)) {
2158 if (!devm_gpio_request(&pdev->dev, udc->vbus_pin, "atmel_usba_udc")) {
2159 irq_set_status_flags(gpio_to_irq(udc->vbus_pin),
2160 IRQ_NOAUTOEN);
2161 ret = devm_request_threaded_irq(&pdev->dev,
2162 gpio_to_irq(udc->vbus_pin), NULL,
2163 usba_vbus_irq_thread, IRQF_ONESHOT,
2164 "atmel_usba_udc", udc);
2165 if (ret) {
2166 udc->vbus_pin = -ENODEV;
2167 dev_warn(&udc->pdev->dev,
2168 "failed to request vbus irq; "
2169 "assuming always on\n");
2170 }
2171 } else {
2172 /* gpio_request fail so use -EINVAL for gpio_is_valid */
2173 udc->vbus_pin = -EINVAL;
2174 }
2175 }
2176
2177 ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2178 if (ret)
2179 return ret;
2180 device_init_wakeup(&pdev->dev, 1);
2181
2182 usba_init_debugfs(udc);
2183 for (i = 1; i < udc->num_ep; i++)
2184 usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
2185
2186 return 0;
2187 }
2188
2189 static int usba_udc_remove(struct platform_device *pdev)
2190 {
2191 struct usba_udc *udc;
2192 int i;
2193
2194 udc = platform_get_drvdata(pdev);
2195
2196 device_init_wakeup(&pdev->dev, 0);
2197 usb_del_gadget_udc(&udc->gadget);
2198
2199 for (i = 1; i < udc->num_ep; i++)
2200 usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
2201 usba_cleanup_debugfs(udc);
2202
2203 return 0;
2204 }
2205
2206 #ifdef CONFIG_PM_SLEEP
2207 static int usba_udc_suspend(struct device *dev)
2208 {
2209 struct usba_udc *udc = dev_get_drvdata(dev);
2210
2211 /* Not started */
2212 if (!udc->driver)
2213 return 0;
2214
2215 mutex_lock(&udc->vbus_mutex);
2216
2217 if (!device_may_wakeup(dev)) {
2218 usba_stop(udc);
2219 goto out;
2220 }
2221
2222 /*
2223 * Device may wake up. We stay clocked if we failed
2224 * to request vbus irq, assuming always on.
2225 */
2226 if (gpio_is_valid(udc->vbus_pin)) {
2227 usba_stop(udc);
2228 enable_irq_wake(gpio_to_irq(udc->vbus_pin));
2229 }
2230
2231 out:
2232 mutex_unlock(&udc->vbus_mutex);
2233 return 0;
2234 }
2235
2236 static int usba_udc_resume(struct device *dev)
2237 {
2238 struct usba_udc *udc = dev_get_drvdata(dev);
2239
2240 /* Not started */
2241 if (!udc->driver)
2242 return 0;
2243
2244 if (device_may_wakeup(dev) && gpio_is_valid(udc->vbus_pin))
2245 disable_irq_wake(gpio_to_irq(udc->vbus_pin));
2246
2247 /* If Vbus is present, enable the controller and wait for reset */
2248 mutex_lock(&udc->vbus_mutex);
2249 udc->vbus_prev = vbus_is_present(udc);
2250 if (udc->vbus_prev)
2251 usba_start(udc);
2252 mutex_unlock(&udc->vbus_mutex);
2253
2254 return 0;
2255 }
2256 #endif
2257
2258 static SIMPLE_DEV_PM_OPS(usba_udc_pm_ops, usba_udc_suspend, usba_udc_resume);
2259
2260 static struct platform_driver udc_driver = {
2261 .remove = usba_udc_remove,
2262 .driver = {
2263 .name = "atmel_usba_udc",
2264 .pm = &usba_udc_pm_ops,
2265 .of_match_table = of_match_ptr(atmel_udc_dt_ids),
2266 },
2267 };
2268
2269 module_platform_driver_probe(udc_driver, usba_udc_probe);
2270
2271 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2272 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2273 MODULE_LICENSE("GPL");
2274 MODULE_ALIAS("platform:atmel_usba_udc");
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