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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/module.h>
12#include <linux/init.h>
13#include <linux/interrupt.h>
14#include <linux/io.h>
15#include <linux/slab.h>
16#include <linux/device.h>
17#include <linux/dma-mapping.h>
18#include <linux/list.h>
19#include <linux/platform_device.h>
20#include <linux/usb/ch9.h>
21#include <linux/usb/gadget.h>
22#include <linux/usb/atmel_usba_udc.h>
23#include <linux/delay.h>
24
25#include <asm/gpio.h>
26#include <mach/board.h>
27
28#include "atmel_usba_udc.h"
29
30
31static struct usba_udc the_udc;
32static struct usba_ep *usba_ep;
33
34#ifdef CONFIG_USB_GADGET_DEBUG_FS
35#include <linux/debugfs.h>
36#include <linux/uaccess.h>
37
38static int queue_dbg_open(struct inode *inode, struct file *file)
39{
40 struct usba_ep *ep = inode->i_private;
41 struct usba_request *req, *req_copy;
42 struct list_head *queue_data;
43
44 queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
45 if (!queue_data)
46 return -ENOMEM;
47 INIT_LIST_HEAD(queue_data);
48
49 spin_lock_irq(&ep->udc->lock);
50 list_for_each_entry(req, &ep->queue, queue) {
51 req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
52 if (!req_copy)
53 goto fail;
54 list_add_tail(&req_copy->queue, queue_data);
55 }
56 spin_unlock_irq(&ep->udc->lock);
57
58 file->private_data = queue_data;
59 return 0;
60
61fail:
62 spin_unlock_irq(&ep->udc->lock);
63 list_for_each_entry_safe(req, req_copy, queue_data, queue) {
64 list_del(&req->queue);
65 kfree(req);
66 }
67 kfree(queue_data);
68 return -ENOMEM;
69}
70
71/*
72 * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
73 *
74 * b: buffer address
75 * l: buffer length
76 * I/i: interrupt/no interrupt
77 * Z/z: zero/no zero
78 * S/s: short ok/short not ok
79 * s: status
80 * n: nr_packets
81 * F/f: submitted/not submitted to FIFO
82 * D/d: using/not using DMA
83 * L/l: last transaction/not last transaction
84 */
85static ssize_t queue_dbg_read(struct file *file, char __user *buf,
86 size_t nbytes, loff_t *ppos)
87{
88 struct list_head *queue = file->private_data;
89 struct usba_request *req, *tmp_req;
90 size_t len, remaining, actual = 0;
91 char tmpbuf[38];
92
93 if (!access_ok(VERIFY_WRITE, buf, nbytes))
94 return -EFAULT;
95
96 mutex_lock(&file->f_dentry->d_inode->i_mutex);
97 list_for_each_entry_safe(req, tmp_req, queue, queue) {
98 len = snprintf(tmpbuf, sizeof(tmpbuf),
99 "%8p %08x %c%c%c %5d %c%c%c\n",
100 req->req.buf, req->req.length,
101 req->req.no_interrupt ? 'i' : 'I',
102 req->req.zero ? 'Z' : 'z',
103 req->req.short_not_ok ? 's' : 'S',
104 req->req.status,
105 req->submitted ? 'F' : 'f',
106 req->using_dma ? 'D' : 'd',
107 req->last_transaction ? 'L' : 'l');
108 len = min(len, sizeof(tmpbuf));
109 if (len > nbytes)
110 break;
111
112 list_del(&req->queue);
113 kfree(req);
114
115 remaining = __copy_to_user(buf, tmpbuf, len);
116 actual += len - remaining;
117 if (remaining)
118 break;
119
120 nbytes -= len;
121 buf += len;
122 }
123 mutex_unlock(&file->f_dentry->d_inode->i_mutex);
124
125 return actual;
126}
127
128static int queue_dbg_release(struct inode *inode, struct file *file)
129{
130 struct list_head *queue_data = file->private_data;
131 struct usba_request *req, *tmp_req;
132
133 list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
134 list_del(&req->queue);
135 kfree(req);
136 }
137 kfree(queue_data);
138 return 0;
139}
140
141static int regs_dbg_open(struct inode *inode, struct file *file)
142{
143 struct usba_udc *udc;
144 unsigned int i;
145 u32 *data;
146 int ret = -ENOMEM;
147
148 mutex_lock(&inode->i_mutex);
149 udc = inode->i_private;
150 data = kmalloc(inode->i_size, GFP_KERNEL);
151 if (!data)
152 goto out;
153
154 spin_lock_irq(&udc->lock);
155 for (i = 0; i < inode->i_size / 4; i++)
156 data[i] = __raw_readl(udc->regs + i * 4);
157 spin_unlock_irq(&udc->lock);
158
159 file->private_data = data;
160 ret = 0;
161
162out:
163 mutex_unlock(&inode->i_mutex);
164
165 return ret;
166}
167
168static ssize_t regs_dbg_read(struct file *file, char __user *buf,
169 size_t nbytes, loff_t *ppos)
170{
171 struct inode *inode = file->f_dentry->d_inode;
172 int ret;
173
174 mutex_lock(&inode->i_mutex);
175 ret = simple_read_from_buffer(buf, nbytes, ppos,
176 file->private_data,
177 file->f_dentry->d_inode->i_size);
178 mutex_unlock(&inode->i_mutex);
179
180 return ret;
181}
182
183static int regs_dbg_release(struct inode *inode, struct file *file)
184{
185 kfree(file->private_data);
186 return 0;
187}
188
189const struct file_operations queue_dbg_fops = {
190 .owner = THIS_MODULE,
191 .open = queue_dbg_open,
192 .llseek = no_llseek,
193 .read = queue_dbg_read,
194 .release = queue_dbg_release,
195};
196
197const struct file_operations regs_dbg_fops = {
198 .owner = THIS_MODULE,
199 .open = regs_dbg_open,
200 .llseek = generic_file_llseek,
201 .read = regs_dbg_read,
202 .release = regs_dbg_release,
203};
204
205static void usba_ep_init_debugfs(struct usba_udc *udc,
206 struct usba_ep *ep)
207{
208 struct dentry *ep_root;
209
210 ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
211 if (!ep_root)
212 goto err_root;
213 ep->debugfs_dir = ep_root;
214
215 ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
216 ep, &queue_dbg_fops);
217 if (!ep->debugfs_queue)
218 goto err_queue;
219
220 if (ep->can_dma) {
221 ep->debugfs_dma_status
222 = debugfs_create_u32("dma_status", 0400, ep_root,
223 &ep->last_dma_status);
224 if (!ep->debugfs_dma_status)
225 goto err_dma_status;
226 }
227 if (ep_is_control(ep)) {
228 ep->debugfs_state
229 = debugfs_create_u32("state", 0400, ep_root,
230 &ep->state);
231 if (!ep->debugfs_state)
232 goto err_state;
233 }
234
235 return;
236
237err_state:
238 if (ep->can_dma)
239 debugfs_remove(ep->debugfs_dma_status);
240err_dma_status:
241 debugfs_remove(ep->debugfs_queue);
242err_queue:
243 debugfs_remove(ep_root);
244err_root:
245 dev_err(&ep->udc->pdev->dev,
246 "failed to create debugfs directory for %s\n", ep->ep.name);
247}
248
249static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
250{
251 debugfs_remove(ep->debugfs_queue);
252 debugfs_remove(ep->debugfs_dma_status);
253 debugfs_remove(ep->debugfs_state);
254 debugfs_remove(ep->debugfs_dir);
255 ep->debugfs_dma_status = NULL;
256 ep->debugfs_dir = NULL;
257}
258
259static void usba_init_debugfs(struct usba_udc *udc)
260{
261 struct dentry *root, *regs;
262 struct resource *regs_resource;
263
264 root = debugfs_create_dir(udc->gadget.name, NULL);
265 if (IS_ERR(root) || !root)
266 goto err_root;
267 udc->debugfs_root = root;
268
269 regs = debugfs_create_file("regs", 0400, root, udc, ®s_dbg_fops);
270 if (!regs)
271 goto err_regs;
272
273 regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
274 CTRL_IOMEM_ID);
275 regs->d_inode->i_size = resource_size(regs_resource);
276 udc->debugfs_regs = regs;
277
278 usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
279
280 return;
281
282err_regs:
283 debugfs_remove(root);
284err_root:
285 udc->debugfs_root = NULL;
286 dev_err(&udc->pdev->dev, "debugfs is not available\n");
287}
288
289static void usba_cleanup_debugfs(struct usba_udc *udc)
290{
291 usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
292 debugfs_remove(udc->debugfs_regs);
293 debugfs_remove(udc->debugfs_root);
294 udc->debugfs_regs = NULL;
295 udc->debugfs_root = NULL;
296}
297#else
298static inline void usba_ep_init_debugfs(struct usba_udc *udc,
299 struct usba_ep *ep)
300{
301
302}
303
304static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
305{
306
307}
308
309static inline void usba_init_debugfs(struct usba_udc *udc)
310{
311
312}
313
314static inline void usba_cleanup_debugfs(struct usba_udc *udc)
315{
316
317}
318#endif
319
320static int vbus_is_present(struct usba_udc *udc)
321{
322 if (gpio_is_valid(udc->vbus_pin))
323 return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
324
325 /* No Vbus detection: Assume always present */
326 return 1;
327}
328
329#if defined(CONFIG_ARCH_AT91SAM9RL)
330
331#include <mach/at91_pmc.h>
332
333static void toggle_bias(int is_on)
334{
335 unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
336
337 if (is_on)
338 at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
339 else
340 at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
341}
342
343#else
344
345static void toggle_bias(int is_on)
346{
347}
348
349#endif /* CONFIG_ARCH_AT91SAM9RL */
350
351static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
352{
353 unsigned int transaction_len;
354
355 transaction_len = req->req.length - req->req.actual;
356 req->last_transaction = 1;
357 if (transaction_len > ep->ep.maxpacket) {
358 transaction_len = ep->ep.maxpacket;
359 req->last_transaction = 0;
360 } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
361 req->last_transaction = 0;
362
363 DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
364 ep->ep.name, req, transaction_len,
365 req->last_transaction ? ", done" : "");
366
367 memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
368 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
369 req->req.actual += transaction_len;
370}
371
372static void submit_request(struct usba_ep *ep, struct usba_request *req)
373{
374 DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
375 ep->ep.name, req, req->req.length);
376
377 req->req.actual = 0;
378 req->submitted = 1;
379
380 if (req->using_dma) {
381 if (req->req.length == 0) {
382 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
383 return;
384 }
385
386 if (req->req.zero)
387 usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
388 else
389 usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
390
391 usba_dma_writel(ep, ADDRESS, req->req.dma);
392 usba_dma_writel(ep, CONTROL, req->ctrl);
393 } else {
394 next_fifo_transaction(ep, req);
395 if (req->last_transaction) {
396 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
397 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
398 } else {
399 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
400 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
401 }
402 }
403}
404
405static void submit_next_request(struct usba_ep *ep)
406{
407 struct usba_request *req;
408
409 if (list_empty(&ep->queue)) {
410 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
411 return;
412 }
413
414 req = list_entry(ep->queue.next, struct usba_request, queue);
415 if (!req->submitted)
416 submit_request(ep, req);
417}
418
419static void send_status(struct usba_udc *udc, struct usba_ep *ep)
420{
421 ep->state = STATUS_STAGE_IN;
422 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
423 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
424}
425
426static void receive_data(struct usba_ep *ep)
427{
428 struct usba_udc *udc = ep->udc;
429 struct usba_request *req;
430 unsigned long status;
431 unsigned int bytecount, nr_busy;
432 int is_complete = 0;
433
434 status = usba_ep_readl(ep, STA);
435 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
436
437 DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
438
439 while (nr_busy > 0) {
440 if (list_empty(&ep->queue)) {
441 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
442 break;
443 }
444 req = list_entry(ep->queue.next,
445 struct usba_request, queue);
446
447 bytecount = USBA_BFEXT(BYTE_COUNT, status);
448
449 if (status & (1 << 31))
450 is_complete = 1;
451 if (req->req.actual + bytecount >= req->req.length) {
452 is_complete = 1;
453 bytecount = req->req.length - req->req.actual;
454 }
455
456 memcpy_fromio(req->req.buf + req->req.actual,
457 ep->fifo, bytecount);
458 req->req.actual += bytecount;
459
460 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
461
462 if (is_complete) {
463 DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
464 req->req.status = 0;
465 list_del_init(&req->queue);
466 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
467 spin_unlock(&udc->lock);
468 req->req.complete(&ep->ep, &req->req);
469 spin_lock(&udc->lock);
470 }
471
472 status = usba_ep_readl(ep, STA);
473 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
474
475 if (is_complete && ep_is_control(ep)) {
476 send_status(udc, ep);
477 break;
478 }
479 }
480}
481
482static void
483request_complete(struct usba_ep *ep, struct usba_request *req, int status)
484{
485 struct usba_udc *udc = ep->udc;
486
487 WARN_ON(!list_empty(&req->queue));
488
489 if (req->req.status == -EINPROGRESS)
490 req->req.status = status;
491
492 if (req->mapped) {
493 dma_unmap_single(
494 &udc->pdev->dev, req->req.dma, req->req.length,
495 ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
496 req->req.dma = DMA_ADDR_INVALID;
497 req->mapped = 0;
498 }
499
500 DBG(DBG_GADGET | DBG_REQ,
501 "%s: req %p complete: status %d, actual %u\n",
502 ep->ep.name, req, req->req.status, req->req.actual);
503
504 spin_unlock(&udc->lock);
505 req->req.complete(&ep->ep, &req->req);
506 spin_lock(&udc->lock);
507}
508
509static void
510request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
511{
512 struct usba_request *req, *tmp_req;
513
514 list_for_each_entry_safe(req, tmp_req, list, queue) {
515 list_del_init(&req->queue);
516 request_complete(ep, req, status);
517 }
518}
519
520static int
521usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
522{
523 struct usba_ep *ep = to_usba_ep(_ep);
524 struct usba_udc *udc = ep->udc;
525 unsigned long flags, ept_cfg, maxpacket;
526 unsigned int nr_trans;
527
528 DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
529
530 maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
531
532 if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
533 || ep->index == 0
534 || desc->bDescriptorType != USB_DT_ENDPOINT
535 || maxpacket == 0
536 || maxpacket > ep->fifo_size) {
537 DBG(DBG_ERR, "ep_enable: Invalid argument");
538 return -EINVAL;
539 }
540
541 ep->is_isoc = 0;
542 ep->is_in = 0;
543
544 if (maxpacket <= 8)
545 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
546 else
547 /* LSB is bit 1, not 0 */
548 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
549
550 DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
551 ep->ep.name, ept_cfg, maxpacket);
552
553 if (usb_endpoint_dir_in(desc)) {
554 ep->is_in = 1;
555 ept_cfg |= USBA_EPT_DIR_IN;
556 }
557
558 switch (usb_endpoint_type(desc)) {
559 case USB_ENDPOINT_XFER_CONTROL:
560 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
561 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
562 break;
563 case USB_ENDPOINT_XFER_ISOC:
564 if (!ep->can_isoc) {
565 DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
566 ep->ep.name);
567 return -EINVAL;
568 }
569
570 /*
571 * Bits 11:12 specify number of _additional_
572 * transactions per microframe.
573 */
574 nr_trans = ((usb_endpoint_maxp(desc) >> 11) & 3) + 1;
575 if (nr_trans > 3)
576 return -EINVAL;
577
578 ep->is_isoc = 1;
579 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
580
581 /*
582 * Do triple-buffering on high-bandwidth iso endpoints.
583 */
584 if (nr_trans > 1 && ep->nr_banks == 3)
585 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
586 else
587 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
588 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
589 break;
590 case USB_ENDPOINT_XFER_BULK:
591 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
592 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
593 break;
594 case USB_ENDPOINT_XFER_INT:
595 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
596 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
597 break;
598 }
599
600 spin_lock_irqsave(&ep->udc->lock, flags);
601
602 ep->ep.desc = desc;
603 ep->ep.maxpacket = maxpacket;
604
605 usba_ep_writel(ep, CFG, ept_cfg);
606 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
607
608 if (ep->can_dma) {
609 u32 ctrl;
610
611 usba_writel(udc, INT_ENB,
612 (usba_readl(udc, INT_ENB)
613 | USBA_BF(EPT_INT, 1 << ep->index)
614 | USBA_BF(DMA_INT, 1 << ep->index)));
615 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
616 usba_ep_writel(ep, CTL_ENB, ctrl);
617 } else {
618 usba_writel(udc, INT_ENB,
619 (usba_readl(udc, INT_ENB)
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_readl(udc, INT_ENB));
629
630 return 0;
631}
632
633static 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_writel(udc, INT_ENB,
665 usba_readl(udc, INT_ENB)
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
675static struct usb_request *
676usba_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 req->req.dma = DMA_ADDR_INVALID;
688
689 return &req->req;
690}
691
692static void
693usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
694{
695 struct usba_request *req = to_usba_req(_req);
696
697 DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
698
699 kfree(req);
700}
701
702static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
703 struct usba_request *req, gfp_t gfp_flags)
704{
705 unsigned long flags;
706 int ret;
707
708 DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
709 ep->ep.name, req->req.length, req->req.dma,
710 req->req.zero ? 'Z' : 'z',
711 req->req.short_not_ok ? 'S' : 's',
712 req->req.no_interrupt ? 'I' : 'i');
713
714 if (req->req.length > 0x10000) {
715 /* Lengths from 0 to 65536 (inclusive) are supported */
716 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
717 return -EINVAL;
718 }
719
720 req->using_dma = 1;
721
722 if (req->req.dma == DMA_ADDR_INVALID) {
723 req->req.dma = dma_map_single(
724 &udc->pdev->dev, req->req.buf, req->req.length,
725 ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
726 req->mapped = 1;
727 } else {
728 dma_sync_single_for_device(
729 &udc->pdev->dev, req->req.dma, req->req.length,
730 ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
731 req->mapped = 0;
732 }
733
734 req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
735 | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
736 | USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
737
738 if (ep->is_in)
739 req->ctrl |= USBA_DMA_END_BUF_EN;
740
741 /*
742 * Add this request to the queue and submit for DMA if
743 * possible. Check if we're still alive first -- we may have
744 * received a reset since last time we checked.
745 */
746 ret = -ESHUTDOWN;
747 spin_lock_irqsave(&udc->lock, flags);
748 if (ep->ep.desc) {
749 if (list_empty(&ep->queue))
750 submit_request(ep, req);
751
752 list_add_tail(&req->queue, &ep->queue);
753 ret = 0;
754 }
755 spin_unlock_irqrestore(&udc->lock, flags);
756
757 return ret;
758}
759
760static int
761usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
762{
763 struct usba_request *req = to_usba_req(_req);
764 struct usba_ep *ep = to_usba_ep(_ep);
765 struct usba_udc *udc = ep->udc;
766 unsigned long flags;
767 int ret;
768
769 DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
770 ep->ep.name, req, _req->length);
771
772 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
773 !ep->ep.desc)
774 return -ESHUTDOWN;
775
776 req->submitted = 0;
777 req->using_dma = 0;
778 req->last_transaction = 0;
779
780 _req->status = -EINPROGRESS;
781 _req->actual = 0;
782
783 if (ep->can_dma)
784 return queue_dma(udc, ep, req, gfp_flags);
785
786 /* May have received a reset since last time we checked */
787 ret = -ESHUTDOWN;
788 spin_lock_irqsave(&udc->lock, flags);
789 if (ep->ep.desc) {
790 list_add_tail(&req->queue, &ep->queue);
791
792 if ((!ep_is_control(ep) && ep->is_in) ||
793 (ep_is_control(ep)
794 && (ep->state == DATA_STAGE_IN
795 || ep->state == STATUS_STAGE_IN)))
796 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
797 else
798 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
799 ret = 0;
800 }
801 spin_unlock_irqrestore(&udc->lock, flags);
802
803 return ret;
804}
805
806static void
807usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
808{
809 req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
810}
811
812static int stop_dma(struct usba_ep *ep, u32 *pstatus)
813{
814 unsigned int timeout;
815 u32 status;
816
817 /*
818 * Stop the DMA controller. When writing both CH_EN
819 * and LINK to 0, the other bits are not affected.
820 */
821 usba_dma_writel(ep, CONTROL, 0);
822
823 /* Wait for the FIFO to empty */
824 for (timeout = 40; timeout; --timeout) {
825 status = usba_dma_readl(ep, STATUS);
826 if (!(status & USBA_DMA_CH_EN))
827 break;
828 udelay(1);
829 }
830
831 if (pstatus)
832 *pstatus = status;
833
834 if (timeout == 0) {
835 dev_err(&ep->udc->pdev->dev,
836 "%s: timed out waiting for DMA FIFO to empty\n",
837 ep->ep.name);
838 return -ETIMEDOUT;
839 }
840
841 return 0;
842}
843
844static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
845{
846 struct usba_ep *ep = to_usba_ep(_ep);
847 struct usba_udc *udc = ep->udc;
848 struct usba_request *req = to_usba_req(_req);
849 unsigned long flags;
850 u32 status;
851
852 DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
853 ep->ep.name, req);
854
855 spin_lock_irqsave(&udc->lock, flags);
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
892static 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
937static 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
944static 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
952static 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
964static 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
971static 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
989static int
990usba_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 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
1005static int atmel_usba_start(struct usb_gadget *gadget,
1006 struct usb_gadget_driver *driver);
1007static int atmel_usba_stop(struct usb_gadget *gadget,
1008 struct usb_gadget_driver *driver);
1009static 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
1017static 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
1027static void nop_release(struct device *dev)
1028{
1029
1030}
1031
1032static struct usba_udc the_udc = {
1033 .gadget = {
1034 .ops = &usba_udc_ops,
1035 .ep_list = LIST_HEAD_INIT(the_udc.gadget.ep_list),
1036 .max_speed = USB_SPEED_HIGH,
1037 .name = "atmel_usba_udc",
1038 .dev = {
1039 .init_name = "gadget",
1040 .release = nop_release,
1041 },
1042 },
1043};
1044
1045/*
1046 * Called with interrupts disabled and udc->lock held.
1047 */
1048static void reset_all_endpoints(struct usba_udc *udc)
1049{
1050 struct usba_ep *ep;
1051 struct usba_request *req, *tmp_req;
1052
1053 usba_writel(udc, EPT_RST, ~0UL);
1054
1055 ep = to_usba_ep(udc->gadget.ep0);
1056 list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1057 list_del_init(&req->queue);
1058 request_complete(ep, req, -ECONNRESET);
1059 }
1060
1061 /* NOTE: normally, the next call to the gadget driver is in
1062 * charge of disabling endpoints... usually disconnect().
1063 * The exception would be entering a high speed test mode.
1064 *
1065 * FIXME remove this code ... and retest thoroughly.
1066 */
1067 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1068 if (ep->ep.desc) {
1069 spin_unlock(&udc->lock);
1070 usba_ep_disable(&ep->ep);
1071 spin_lock(&udc->lock);
1072 }
1073 }
1074}
1075
1076static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1077{
1078 struct usba_ep *ep;
1079
1080 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1081 return to_usba_ep(udc->gadget.ep0);
1082
1083 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1084 u8 bEndpointAddress;
1085
1086 if (!ep->ep.desc)
1087 continue;
1088 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1089 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1090 continue;
1091 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1092 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1093 return ep;
1094 }
1095
1096 return NULL;
1097}
1098
1099/* Called with interrupts disabled and udc->lock held */
1100static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1101{
1102 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1103 ep->state = WAIT_FOR_SETUP;
1104}
1105
1106static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1107{
1108 if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1109 return 1;
1110 return 0;
1111}
1112
1113static inline void set_address(struct usba_udc *udc, unsigned int addr)
1114{
1115 u32 regval;
1116
1117 DBG(DBG_BUS, "setting address %u...\n", addr);
1118 regval = usba_readl(udc, CTRL);
1119 regval = USBA_BFINS(DEV_ADDR, addr, regval);
1120 usba_writel(udc, CTRL, regval);
1121}
1122
1123static int do_test_mode(struct usba_udc *udc)
1124{
1125 static const char test_packet_buffer[] = {
1126 /* JKJKJKJK * 9 */
1127 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1128 /* JJKKJJKK * 8 */
1129 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1130 /* JJKKJJKK * 8 */
1131 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1132 /* JJJJJJJKKKKKKK * 8 */
1133 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1134 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1135 /* JJJJJJJK * 8 */
1136 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1137 /* {JKKKKKKK * 10}, JK */
1138 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1139 };
1140 struct usba_ep *ep;
1141 struct device *dev = &udc->pdev->dev;
1142 int test_mode;
1143
1144 test_mode = udc->test_mode;
1145
1146 /* Start from a clean slate */
1147 reset_all_endpoints(udc);
1148
1149 switch (test_mode) {
1150 case 0x0100:
1151 /* Test_J */
1152 usba_writel(udc, TST, USBA_TST_J_MODE);
1153 dev_info(dev, "Entering Test_J mode...\n");
1154 break;
1155 case 0x0200:
1156 /* Test_K */
1157 usba_writel(udc, TST, USBA_TST_K_MODE);
1158 dev_info(dev, "Entering Test_K mode...\n");
1159 break;
1160 case 0x0300:
1161 /*
1162 * Test_SE0_NAK: Force high-speed mode and set up ep0
1163 * for Bulk IN transfers
1164 */
1165 ep = &usba_ep[0];
1166 usba_writel(udc, TST,
1167 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1168 usba_ep_writel(ep, CFG,
1169 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1170 | USBA_EPT_DIR_IN
1171 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1172 | USBA_BF(BK_NUMBER, 1));
1173 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1174 set_protocol_stall(udc, ep);
1175 dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1176 } else {
1177 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1178 dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1179 }
1180 break;
1181 case 0x0400:
1182 /* Test_Packet */
1183 ep = &usba_ep[0];
1184 usba_ep_writel(ep, CFG,
1185 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1186 | USBA_EPT_DIR_IN
1187 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1188 | USBA_BF(BK_NUMBER, 1));
1189 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1190 set_protocol_stall(udc, ep);
1191 dev_err(dev, "Test_Packet: ep0 not mapped\n");
1192 } else {
1193 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1194 usba_writel(udc, TST, USBA_TST_PKT_MODE);
1195 memcpy_toio(ep->fifo, test_packet_buffer,
1196 sizeof(test_packet_buffer));
1197 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1198 dev_info(dev, "Entering Test_Packet mode...\n");
1199 }
1200 break;
1201 default:
1202 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1203 return -EINVAL;
1204 }
1205
1206 return 0;
1207}
1208
1209/* Avoid overly long expressions */
1210static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1211{
1212 if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1213 return true;
1214 return false;
1215}
1216
1217static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1218{
1219 if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1220 return true;
1221 return false;
1222}
1223
1224static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1225{
1226 if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1227 return true;
1228 return false;
1229}
1230
1231static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1232 struct usb_ctrlrequest *crq)
1233{
1234 int retval = 0;
1235
1236 switch (crq->bRequest) {
1237 case USB_REQ_GET_STATUS: {
1238 u16 status;
1239
1240 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1241 status = cpu_to_le16(udc->devstatus);
1242 } else if (crq->bRequestType
1243 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1244 status = cpu_to_le16(0);
1245 } else if (crq->bRequestType
1246 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1247 struct usba_ep *target;
1248
1249 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1250 if (!target)
1251 goto stall;
1252
1253 status = 0;
1254 if (is_stalled(udc, target))
1255 status |= cpu_to_le16(1);
1256 } else
1257 goto delegate;
1258
1259 /* Write directly to the FIFO. No queueing is done. */
1260 if (crq->wLength != cpu_to_le16(sizeof(status)))
1261 goto stall;
1262 ep->state = DATA_STAGE_IN;
1263 __raw_writew(status, ep->fifo);
1264 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1265 break;
1266 }
1267
1268 case USB_REQ_CLEAR_FEATURE: {
1269 if (crq->bRequestType == USB_RECIP_DEVICE) {
1270 if (feature_is_dev_remote_wakeup(crq))
1271 udc->devstatus
1272 &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1273 else
1274 /* Can't CLEAR_FEATURE TEST_MODE */
1275 goto stall;
1276 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1277 struct usba_ep *target;
1278
1279 if (crq->wLength != cpu_to_le16(0)
1280 || !feature_is_ep_halt(crq))
1281 goto stall;
1282 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1283 if (!target)
1284 goto stall;
1285
1286 usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1287 if (target->index != 0)
1288 usba_ep_writel(target, CLR_STA,
1289 USBA_TOGGLE_CLR);
1290 } else {
1291 goto delegate;
1292 }
1293
1294 send_status(udc, ep);
1295 break;
1296 }
1297
1298 case USB_REQ_SET_FEATURE: {
1299 if (crq->bRequestType == USB_RECIP_DEVICE) {
1300 if (feature_is_dev_test_mode(crq)) {
1301 send_status(udc, ep);
1302 ep->state = STATUS_STAGE_TEST;
1303 udc->test_mode = le16_to_cpu(crq->wIndex);
1304 return 0;
1305 } else if (feature_is_dev_remote_wakeup(crq)) {
1306 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1307 } else {
1308 goto stall;
1309 }
1310 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1311 struct usba_ep *target;
1312
1313 if (crq->wLength != cpu_to_le16(0)
1314 || !feature_is_ep_halt(crq))
1315 goto stall;
1316
1317 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1318 if (!target)
1319 goto stall;
1320
1321 usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1322 } else
1323 goto delegate;
1324
1325 send_status(udc, ep);
1326 break;
1327 }
1328
1329 case USB_REQ_SET_ADDRESS:
1330 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1331 goto delegate;
1332
1333 set_address(udc, le16_to_cpu(crq->wValue));
1334 send_status(udc, ep);
1335 ep->state = STATUS_STAGE_ADDR;
1336 break;
1337
1338 default:
1339delegate:
1340 spin_unlock(&udc->lock);
1341 retval = udc->driver->setup(&udc->gadget, crq);
1342 spin_lock(&udc->lock);
1343 }
1344
1345 return retval;
1346
1347stall:
1348 pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1349 "halting endpoint...\n",
1350 ep->ep.name, crq->bRequestType, crq->bRequest,
1351 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1352 le16_to_cpu(crq->wLength));
1353 set_protocol_stall(udc, ep);
1354 return -1;
1355}
1356
1357static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1358{
1359 struct usba_request *req;
1360 u32 epstatus;
1361 u32 epctrl;
1362
1363restart:
1364 epstatus = usba_ep_readl(ep, STA);
1365 epctrl = usba_ep_readl(ep, CTL);
1366
1367 DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1368 ep->ep.name, ep->state, epstatus, epctrl);
1369
1370 req = NULL;
1371 if (!list_empty(&ep->queue))
1372 req = list_entry(ep->queue.next,
1373 struct usba_request, queue);
1374
1375 if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1376 if (req->submitted)
1377 next_fifo_transaction(ep, req);
1378 else
1379 submit_request(ep, req);
1380
1381 if (req->last_transaction) {
1382 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1383 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1384 }
1385 goto restart;
1386 }
1387 if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1388 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1389
1390 switch (ep->state) {
1391 case DATA_STAGE_IN:
1392 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1393 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1394 ep->state = STATUS_STAGE_OUT;
1395 break;
1396 case STATUS_STAGE_ADDR:
1397 /* Activate our new address */
1398 usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1399 | USBA_FADDR_EN));
1400 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1401 ep->state = WAIT_FOR_SETUP;
1402 break;
1403 case STATUS_STAGE_IN:
1404 if (req) {
1405 list_del_init(&req->queue);
1406 request_complete(ep, req, 0);
1407 submit_next_request(ep);
1408 }
1409 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1410 ep->state = WAIT_FOR_SETUP;
1411 break;
1412 case STATUS_STAGE_TEST:
1413 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1414 ep->state = WAIT_FOR_SETUP;
1415 if (do_test_mode(udc))
1416 set_protocol_stall(udc, ep);
1417 break;
1418 default:
1419 pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1420 "halting endpoint...\n",
1421 ep->ep.name, ep->state);
1422 set_protocol_stall(udc, ep);
1423 break;
1424 }
1425
1426 goto restart;
1427 }
1428 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1429 switch (ep->state) {
1430 case STATUS_STAGE_OUT:
1431 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1432 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1433
1434 if (req) {
1435 list_del_init(&req->queue);
1436 request_complete(ep, req, 0);
1437 }
1438 ep->state = WAIT_FOR_SETUP;
1439 break;
1440
1441 case DATA_STAGE_OUT:
1442 receive_data(ep);
1443 break;
1444
1445 default:
1446 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1447 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1448 pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1449 "halting endpoint...\n",
1450 ep->ep.name, ep->state);
1451 set_protocol_stall(udc, ep);
1452 break;
1453 }
1454
1455 goto restart;
1456 }
1457 if (epstatus & USBA_RX_SETUP) {
1458 union {
1459 struct usb_ctrlrequest crq;
1460 unsigned long data[2];
1461 } crq;
1462 unsigned int pkt_len;
1463 int ret;
1464
1465 if (ep->state != WAIT_FOR_SETUP) {
1466 /*
1467 * Didn't expect a SETUP packet at this
1468 * point. Clean up any pending requests (which
1469 * may be successful).
1470 */
1471 int status = -EPROTO;
1472
1473 /*
1474 * RXRDY and TXCOMP are dropped when SETUP
1475 * packets arrive. Just pretend we received
1476 * the status packet.
1477 */
1478 if (ep->state == STATUS_STAGE_OUT
1479 || ep->state == STATUS_STAGE_IN) {
1480 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1481 status = 0;
1482 }
1483
1484 if (req) {
1485 list_del_init(&req->queue);
1486 request_complete(ep, req, status);
1487 }
1488 }
1489
1490 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1491 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1492 if (pkt_len != sizeof(crq)) {
1493 pr_warning("udc: Invalid packet length %u "
1494 "(expected %zu)\n", pkt_len, sizeof(crq));
1495 set_protocol_stall(udc, ep);
1496 return;
1497 }
1498
1499 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1500 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1501
1502 /* Free up one bank in the FIFO so that we can
1503 * generate or receive a reply right away. */
1504 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1505
1506 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1507 ep->state, crq.crq.bRequestType,
1508 crq.crq.bRequest); */
1509
1510 if (crq.crq.bRequestType & USB_DIR_IN) {
1511 /*
1512 * The USB 2.0 spec states that "if wLength is
1513 * zero, there is no data transfer phase."
1514 * However, testusb #14 seems to actually
1515 * expect a data phase even if wLength = 0...
1516 */
1517 ep->state = DATA_STAGE_IN;
1518 } else {
1519 if (crq.crq.wLength != cpu_to_le16(0))
1520 ep->state = DATA_STAGE_OUT;
1521 else
1522 ep->state = STATUS_STAGE_IN;
1523 }
1524
1525 ret = -1;
1526 if (ep->index == 0)
1527 ret = handle_ep0_setup(udc, ep, &crq.crq);
1528 else {
1529 spin_unlock(&udc->lock);
1530 ret = udc->driver->setup(&udc->gadget, &crq.crq);
1531 spin_lock(&udc->lock);
1532 }
1533
1534 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1535 crq.crq.bRequestType, crq.crq.bRequest,
1536 le16_to_cpu(crq.crq.wLength), ep->state, ret);
1537
1538 if (ret < 0) {
1539 /* Let the host know that we failed */
1540 set_protocol_stall(udc, ep);
1541 }
1542 }
1543}
1544
1545static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1546{
1547 struct usba_request *req;
1548 u32 epstatus;
1549 u32 epctrl;
1550
1551 epstatus = usba_ep_readl(ep, STA);
1552 epctrl = usba_ep_readl(ep, CTL);
1553
1554 DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1555
1556 while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1557 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1558
1559 if (list_empty(&ep->queue)) {
1560 dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1561 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1562 return;
1563 }
1564
1565 req = list_entry(ep->queue.next, struct usba_request, queue);
1566
1567 if (req->using_dma) {
1568 /* Send a zero-length packet */
1569 usba_ep_writel(ep, SET_STA,
1570 USBA_TX_PK_RDY);
1571 usba_ep_writel(ep, CTL_DIS,
1572 USBA_TX_PK_RDY);
1573 list_del_init(&req->queue);
1574 submit_next_request(ep);
1575 request_complete(ep, req, 0);
1576 } else {
1577 if (req->submitted)
1578 next_fifo_transaction(ep, req);
1579 else
1580 submit_request(ep, req);
1581
1582 if (req->last_transaction) {
1583 list_del_init(&req->queue);
1584 submit_next_request(ep);
1585 request_complete(ep, req, 0);
1586 }
1587 }
1588
1589 epstatus = usba_ep_readl(ep, STA);
1590 epctrl = usba_ep_readl(ep, CTL);
1591 }
1592 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1593 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1594 receive_data(ep);
1595 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1596 }
1597}
1598
1599static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1600{
1601 struct usba_request *req;
1602 u32 status, control, pending;
1603
1604 status = usba_dma_readl(ep, STATUS);
1605 control = usba_dma_readl(ep, CONTROL);
1606#ifdef CONFIG_USB_GADGET_DEBUG_FS
1607 ep->last_dma_status = status;
1608#endif
1609 pending = status & control;
1610 DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1611
1612 if (status & USBA_DMA_CH_EN) {
1613 dev_err(&udc->pdev->dev,
1614 "DMA_CH_EN is set after transfer is finished!\n");
1615 dev_err(&udc->pdev->dev,
1616 "status=%#08x, pending=%#08x, control=%#08x\n",
1617 status, pending, control);
1618
1619 /*
1620 * try to pretend nothing happened. We might have to
1621 * do something here...
1622 */
1623 }
1624
1625 if (list_empty(&ep->queue))
1626 /* Might happen if a reset comes along at the right moment */
1627 return;
1628
1629 if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1630 req = list_entry(ep->queue.next, struct usba_request, queue);
1631 usba_update_req(ep, req, status);
1632
1633 list_del_init(&req->queue);
1634 submit_next_request(ep);
1635 request_complete(ep, req, 0);
1636 }
1637}
1638
1639static irqreturn_t usba_udc_irq(int irq, void *devid)
1640{
1641 struct usba_udc *udc = devid;
1642 u32 status;
1643 u32 dma_status;
1644 u32 ep_status;
1645
1646 spin_lock(&udc->lock);
1647
1648 status = usba_readl(udc, INT_STA);
1649 DBG(DBG_INT, "irq, status=%#08x\n", status);
1650
1651 if (status & USBA_DET_SUSPEND) {
1652 toggle_bias(0);
1653 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1654 DBG(DBG_BUS, "Suspend detected\n");
1655 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1656 && udc->driver && udc->driver->suspend) {
1657 spin_unlock(&udc->lock);
1658 udc->driver->suspend(&udc->gadget);
1659 spin_lock(&udc->lock);
1660 }
1661 }
1662
1663 if (status & USBA_WAKE_UP) {
1664 toggle_bias(1);
1665 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1666 DBG(DBG_BUS, "Wake Up CPU detected\n");
1667 }
1668
1669 if (status & USBA_END_OF_RESUME) {
1670 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1671 DBG(DBG_BUS, "Resume detected\n");
1672 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1673 && udc->driver && udc->driver->resume) {
1674 spin_unlock(&udc->lock);
1675 udc->driver->resume(&udc->gadget);
1676 spin_lock(&udc->lock);
1677 }
1678 }
1679
1680 dma_status = USBA_BFEXT(DMA_INT, status);
1681 if (dma_status) {
1682 int i;
1683
1684 for (i = 1; i < USBA_NR_ENDPOINTS; i++)
1685 if (dma_status & (1 << i))
1686 usba_dma_irq(udc, &usba_ep[i]);
1687 }
1688
1689 ep_status = USBA_BFEXT(EPT_INT, status);
1690 if (ep_status) {
1691 int i;
1692
1693 for (i = 0; i < USBA_NR_ENDPOINTS; i++)
1694 if (ep_status & (1 << i)) {
1695 if (ep_is_control(&usba_ep[i]))
1696 usba_control_irq(udc, &usba_ep[i]);
1697 else
1698 usba_ep_irq(udc, &usba_ep[i]);
1699 }
1700 }
1701
1702 if (status & USBA_END_OF_RESET) {
1703 struct usba_ep *ep0;
1704
1705 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1706 reset_all_endpoints(udc);
1707
1708 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1709 && udc->driver->disconnect) {
1710 udc->gadget.speed = USB_SPEED_UNKNOWN;
1711 spin_unlock(&udc->lock);
1712 udc->driver->disconnect(&udc->gadget);
1713 spin_lock(&udc->lock);
1714 }
1715
1716 if (status & USBA_HIGH_SPEED)
1717 udc->gadget.speed = USB_SPEED_HIGH;
1718 else
1719 udc->gadget.speed = USB_SPEED_FULL;
1720 DBG(DBG_BUS, "%s bus reset detected\n",
1721 usb_speed_string(udc->gadget.speed));
1722
1723 ep0 = &usba_ep[0];
1724 ep0->ep.desc = &usba_ep0_desc;
1725 ep0->state = WAIT_FOR_SETUP;
1726 usba_ep_writel(ep0, CFG,
1727 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1728 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1729 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1730 usba_ep_writel(ep0, CTL_ENB,
1731 USBA_EPT_ENABLE | USBA_RX_SETUP);
1732 usba_writel(udc, INT_ENB,
1733 (usba_readl(udc, INT_ENB)
1734 | USBA_BF(EPT_INT, 1)
1735 | USBA_DET_SUSPEND
1736 | USBA_END_OF_RESUME));
1737
1738 /*
1739 * Unclear why we hit this irregularly, e.g. in usbtest,
1740 * but it's clearly harmless...
1741 */
1742 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1743 dev_dbg(&udc->pdev->dev,
1744 "ODD: EP0 configuration is invalid!\n");
1745 }
1746
1747 spin_unlock(&udc->lock);
1748
1749 return IRQ_HANDLED;
1750}
1751
1752static irqreturn_t usba_vbus_irq(int irq, void *devid)
1753{
1754 struct usba_udc *udc = devid;
1755 int vbus;
1756
1757 /* debounce */
1758 udelay(10);
1759
1760 spin_lock(&udc->lock);
1761
1762 /* May happen if Vbus pin toggles during probe() */
1763 if (!udc->driver)
1764 goto out;
1765
1766 vbus = vbus_is_present(udc);
1767 if (vbus != udc->vbus_prev) {
1768 if (vbus) {
1769 toggle_bias(1);
1770 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1771 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1772 } else {
1773 udc->gadget.speed = USB_SPEED_UNKNOWN;
1774 reset_all_endpoints(udc);
1775 toggle_bias(0);
1776 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1777 if (udc->driver->disconnect) {
1778 spin_unlock(&udc->lock);
1779 udc->driver->disconnect(&udc->gadget);
1780 spin_lock(&udc->lock);
1781 }
1782 }
1783 udc->vbus_prev = vbus;
1784 }
1785
1786out:
1787 spin_unlock(&udc->lock);
1788
1789 return IRQ_HANDLED;
1790}
1791
1792static int atmel_usba_start(struct usb_gadget *gadget,
1793 struct usb_gadget_driver *driver)
1794{
1795 struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1796 unsigned long flags;
1797
1798 spin_lock_irqsave(&udc->lock, flags);
1799
1800 udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1801 udc->driver = driver;
1802 udc->gadget.dev.driver = &driver->driver;
1803 spin_unlock_irqrestore(&udc->lock, flags);
1804
1805 clk_enable(udc->pclk);
1806 clk_enable(udc->hclk);
1807
1808 DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1809
1810 udc->vbus_prev = 0;
1811 if (gpio_is_valid(udc->vbus_pin))
1812 enable_irq(gpio_to_irq(udc->vbus_pin));
1813
1814 /* If Vbus is present, enable the controller and wait for reset */
1815 spin_lock_irqsave(&udc->lock, flags);
1816 if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1817 toggle_bias(1);
1818 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1819 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1820 }
1821 spin_unlock_irqrestore(&udc->lock, flags);
1822
1823 return 0;
1824}
1825
1826static int atmel_usba_stop(struct usb_gadget *gadget,
1827 struct usb_gadget_driver *driver)
1828{
1829 struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1830 unsigned long flags;
1831
1832 if (gpio_is_valid(udc->vbus_pin))
1833 disable_irq(gpio_to_irq(udc->vbus_pin));
1834
1835 spin_lock_irqsave(&udc->lock, flags);
1836 udc->gadget.speed = USB_SPEED_UNKNOWN;
1837 reset_all_endpoints(udc);
1838 spin_unlock_irqrestore(&udc->lock, flags);
1839
1840 /* This will also disable the DP pullup */
1841 toggle_bias(0);
1842 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1843
1844 udc->gadget.dev.driver = NULL;
1845 udc->driver = NULL;
1846
1847 clk_disable(udc->hclk);
1848 clk_disable(udc->pclk);
1849
1850 DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
1851
1852 return 0;
1853}
1854
1855static int __init usba_udc_probe(struct platform_device *pdev)
1856{
1857 struct usba_platform_data *pdata = pdev->dev.platform_data;
1858 struct resource *regs, *fifo;
1859 struct clk *pclk, *hclk;
1860 struct usba_udc *udc = &the_udc;
1861 int irq, ret, i;
1862
1863 regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1864 fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1865 if (!regs || !fifo || !pdata)
1866 return -ENXIO;
1867
1868 irq = platform_get_irq(pdev, 0);
1869 if (irq < 0)
1870 return irq;
1871
1872 pclk = clk_get(&pdev->dev, "pclk");
1873 if (IS_ERR(pclk))
1874 return PTR_ERR(pclk);
1875 hclk = clk_get(&pdev->dev, "hclk");
1876 if (IS_ERR(hclk)) {
1877 ret = PTR_ERR(hclk);
1878 goto err_get_hclk;
1879 }
1880
1881 spin_lock_init(&udc->lock);
1882 udc->pdev = pdev;
1883 udc->pclk = pclk;
1884 udc->hclk = hclk;
1885 udc->vbus_pin = -ENODEV;
1886
1887 ret = -ENOMEM;
1888 udc->regs = ioremap(regs->start, resource_size(regs));
1889 if (!udc->regs) {
1890 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
1891 goto err_map_regs;
1892 }
1893 dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
1894 (unsigned long)regs->start, udc->regs);
1895 udc->fifo = ioremap(fifo->start, resource_size(fifo));
1896 if (!udc->fifo) {
1897 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
1898 goto err_map_fifo;
1899 }
1900 dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
1901 (unsigned long)fifo->start, udc->fifo);
1902
1903 device_initialize(&udc->gadget.dev);
1904 udc->gadget.dev.parent = &pdev->dev;
1905 udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
1906
1907 platform_set_drvdata(pdev, udc);
1908
1909 /* Make sure we start from a clean slate */
1910 clk_enable(pclk);
1911 toggle_bias(0);
1912 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1913 clk_disable(pclk);
1914
1915 usba_ep = kzalloc(sizeof(struct usba_ep) * pdata->num_ep,
1916 GFP_KERNEL);
1917 if (!usba_ep)
1918 goto err_alloc_ep;
1919
1920 the_udc.gadget.ep0 = &usba_ep[0].ep;
1921
1922 INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
1923 usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
1924 usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
1925 usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
1926 usba_ep[0].ep.ops = &usba_ep_ops;
1927 usba_ep[0].ep.name = pdata->ep[0].name;
1928 usba_ep[0].ep.maxpacket = pdata->ep[0].fifo_size;
1929 usba_ep[0].udc = &the_udc;
1930 INIT_LIST_HEAD(&usba_ep[0].queue);
1931 usba_ep[0].fifo_size = pdata->ep[0].fifo_size;
1932 usba_ep[0].nr_banks = pdata->ep[0].nr_banks;
1933 usba_ep[0].index = pdata->ep[0].index;
1934 usba_ep[0].can_dma = pdata->ep[0].can_dma;
1935 usba_ep[0].can_isoc = pdata->ep[0].can_isoc;
1936
1937 for (i = 1; i < pdata->num_ep; i++) {
1938 struct usba_ep *ep = &usba_ep[i];
1939
1940 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1941 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1942 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1943 ep->ep.ops = &usba_ep_ops;
1944 ep->ep.name = pdata->ep[i].name;
1945 ep->ep.maxpacket = pdata->ep[i].fifo_size;
1946 ep->udc = &the_udc;
1947 INIT_LIST_HEAD(&ep->queue);
1948 ep->fifo_size = pdata->ep[i].fifo_size;
1949 ep->nr_banks = pdata->ep[i].nr_banks;
1950 ep->index = pdata->ep[i].index;
1951 ep->can_dma = pdata->ep[i].can_dma;
1952 ep->can_isoc = pdata->ep[i].can_isoc;
1953
1954 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1955 }
1956
1957 ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
1958 if (ret) {
1959 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
1960 irq, ret);
1961 goto err_request_irq;
1962 }
1963 udc->irq = irq;
1964
1965 ret = device_add(&udc->gadget.dev);
1966 if (ret) {
1967 dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
1968 goto err_device_add;
1969 }
1970
1971 if (gpio_is_valid(pdata->vbus_pin)) {
1972 if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
1973 udc->vbus_pin = pdata->vbus_pin;
1974 udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
1975
1976 ret = request_irq(gpio_to_irq(udc->vbus_pin),
1977 usba_vbus_irq, 0,
1978 "atmel_usba_udc", udc);
1979 if (ret) {
1980 gpio_free(udc->vbus_pin);
1981 udc->vbus_pin = -ENODEV;
1982 dev_warn(&udc->pdev->dev,
1983 "failed to request vbus irq; "
1984 "assuming always on\n");
1985 } else {
1986 disable_irq(gpio_to_irq(udc->vbus_pin));
1987 }
1988 } else {
1989 /* gpio_request fail so use -EINVAL for gpio_is_valid */
1990 udc->vbus_pin = -EINVAL;
1991 }
1992 }
1993
1994 ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
1995 if (ret)
1996 goto err_add_udc;
1997
1998 usba_init_debugfs(udc);
1999 for (i = 1; i < pdata->num_ep; i++)
2000 usba_ep_init_debugfs(udc, &usba_ep[i]);
2001
2002 return 0;
2003
2004err_add_udc:
2005 if (gpio_is_valid(pdata->vbus_pin)) {
2006 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2007 gpio_free(udc->vbus_pin);
2008 }
2009
2010 device_unregister(&udc->gadget.dev);
2011
2012err_device_add:
2013 free_irq(irq, udc);
2014err_request_irq:
2015 kfree(usba_ep);
2016err_alloc_ep:
2017 iounmap(udc->fifo);
2018err_map_fifo:
2019 iounmap(udc->regs);
2020err_map_regs:
2021 clk_put(hclk);
2022err_get_hclk:
2023 clk_put(pclk);
2024
2025 platform_set_drvdata(pdev, NULL);
2026
2027 return ret;
2028}
2029
2030static int __exit usba_udc_remove(struct platform_device *pdev)
2031{
2032 struct usba_udc *udc;
2033 int i;
2034 struct usba_platform_data *pdata = pdev->dev.platform_data;
2035
2036 udc = platform_get_drvdata(pdev);
2037
2038 usb_del_gadget_udc(&udc->gadget);
2039
2040 for (i = 1; i < pdata->num_ep; i++)
2041 usba_ep_cleanup_debugfs(&usba_ep[i]);
2042 usba_cleanup_debugfs(udc);
2043
2044 if (gpio_is_valid(udc->vbus_pin)) {
2045 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2046 gpio_free(udc->vbus_pin);
2047 }
2048
2049 free_irq(udc->irq, udc);
2050 kfree(usba_ep);
2051 iounmap(udc->fifo);
2052 iounmap(udc->regs);
2053 clk_put(udc->hclk);
2054 clk_put(udc->pclk);
2055
2056 device_unregister(&udc->gadget.dev);
2057
2058 return 0;
2059}
2060
2061static struct platform_driver udc_driver = {
2062 .remove = __exit_p(usba_udc_remove),
2063 .driver = {
2064 .name = "atmel_usba_udc",
2065 .owner = THIS_MODULE,
2066 },
2067};
2068
2069static int __init udc_init(void)
2070{
2071 return platform_driver_probe(&udc_driver, usba_udc_probe);
2072}
2073module_init(udc_init);
2074
2075static void __exit udc_exit(void)
2076{
2077 platform_driver_unregister(&udc_driver);
2078}
2079module_exit(udc_exit);
2080
2081MODULE_DESCRIPTION("Atmel USBA UDC driver");
2082MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2083MODULE_LICENSE("GPL");
2084MODULE_ALIAS("platform:atmel_usba_udc");