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Merge tag 'gpio-v3.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / drivers / usb / gadget / atmel_usba_udc.c
blob2cb52e0438df1b349a1feca20749e3290739a94a
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 #include <linux/platform_data/atmel.h>
25 #include <linux/of.h>
26 #include <linux/of_gpio.h>
27
28 #include <asm/gpio.h>
29
30 #include "atmel_usba_udc.h"
31
32 #ifdef CONFIG_USB_GADGET_DEBUG_FS
33 #include <linux/debugfs.h>
34 #include <linux/uaccess.h>
35
36 static int queue_dbg_open(struct inode *inode, struct file *file)
37 {
38 struct usba_ep *ep = inode->i_private;
39 struct usba_request *req, *req_copy;
40 struct list_head *queue_data;
41
42 queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
43 if (!queue_data)
44 return -ENOMEM;
45 INIT_LIST_HEAD(queue_data);
46
47 spin_lock_irq(&ep->udc->lock);
48 list_for_each_entry(req, &ep->queue, queue) {
49 req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
50 if (!req_copy)
51 goto fail;
52 list_add_tail(&req_copy->queue, queue_data);
53 }
54 spin_unlock_irq(&ep->udc->lock);
55
56 file->private_data = queue_data;
57 return 0;
58
59 fail:
60 spin_unlock_irq(&ep->udc->lock);
61 list_for_each_entry_safe(req, req_copy, queue_data, queue) {
62 list_del(&req->queue);
63 kfree(req);
64 }
65 kfree(queue_data);
66 return -ENOMEM;
67 }
68
69 /*
70 * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
71 *
72 * b: buffer address
73 * l: buffer length
74 * I/i: interrupt/no interrupt
75 * Z/z: zero/no zero
76 * S/s: short ok/short not ok
77 * s: status
78 * n: nr_packets
79 * F/f: submitted/not submitted to FIFO
80 * D/d: using/not using DMA
81 * L/l: last transaction/not last transaction
82 */
83 static ssize_t queue_dbg_read(struct file *file, char __user *buf,
84 size_t nbytes, loff_t *ppos)
85 {
86 struct list_head *queue = file->private_data;
87 struct usba_request *req, *tmp_req;
88 size_t len, remaining, actual = 0;
89 char tmpbuf[38];
90
91 if (!access_ok(VERIFY_WRITE, buf, nbytes))
92 return -EFAULT;
93
94 mutex_lock(&file_inode(file)->i_mutex);
95 list_for_each_entry_safe(req, tmp_req, queue, queue) {
96 len = snprintf(tmpbuf, sizeof(tmpbuf),
97 "%8p %08x %c%c%c %5d %c%c%c\n",
98 req->req.buf, req->req.length,
99 req->req.no_interrupt ? 'i' : 'I',
100 req->req.zero ? 'Z' : 'z',
101 req->req.short_not_ok ? 's' : 'S',
102 req->req.status,
103 req->submitted ? 'F' : 'f',
104 req->using_dma ? 'D' : 'd',
105 req->last_transaction ? 'L' : 'l');
106 len = min(len, sizeof(tmpbuf));
107 if (len > nbytes)
108 break;
109
110 list_del(&req->queue);
111 kfree(req);
112
113 remaining = __copy_to_user(buf, tmpbuf, len);
114 actual += len - remaining;
115 if (remaining)
116 break;
117
118 nbytes -= len;
119 buf += len;
120 }
121 mutex_unlock(&file_inode(file)->i_mutex);
122
123 return actual;
124 }
125
126 static int queue_dbg_release(struct inode *inode, struct file *file)
127 {
128 struct list_head *queue_data = file->private_data;
129 struct usba_request *req, *tmp_req;
130
131 list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
132 list_del(&req->queue);
133 kfree(req);
134 }
135 kfree(queue_data);
136 return 0;
137 }
138
139 static int regs_dbg_open(struct inode *inode, struct file *file)
140 {
141 struct usba_udc *udc;
142 unsigned int i;
143 u32 *data;
144 int ret = -ENOMEM;
145
146 mutex_lock(&inode->i_mutex);
147 udc = inode->i_private;
148 data = kmalloc(inode->i_size, GFP_KERNEL);
149 if (!data)
150 goto out;
151
152 spin_lock_irq(&udc->lock);
153 for (i = 0; i < inode->i_size / 4; i++)
154 data[i] = __raw_readl(udc->regs + i * 4);
155 spin_unlock_irq(&udc->lock);
156
157 file->private_data = data;
158 ret = 0;
159
160 out:
161 mutex_unlock(&inode->i_mutex);
162
163 return ret;
164 }
165
166 static ssize_t regs_dbg_read(struct file *file, char __user *buf,
167 size_t nbytes, loff_t *ppos)
168 {
169 struct inode *inode = file_inode(file);
170 int ret;
171
172 mutex_lock(&inode->i_mutex);
173 ret = simple_read_from_buffer(buf, nbytes, ppos,
174 file->private_data,
175 file_inode(file)->i_size);
176 mutex_unlock(&inode->i_mutex);
177
178 return ret;
179 }
180
181 static int regs_dbg_release(struct inode *inode, struct file *file)
182 {
183 kfree(file->private_data);
184 return 0;
185 }
186
187 const struct file_operations queue_dbg_fops = {
188 .owner = THIS_MODULE,
189 .open = queue_dbg_open,
190 .llseek = no_llseek,
191 .read = queue_dbg_read,
192 .release = queue_dbg_release,
193 };
194
195 const struct file_operations regs_dbg_fops = {
196 .owner = THIS_MODULE,
197 .open = regs_dbg_open,
198 .llseek = generic_file_llseek,
199 .read = regs_dbg_read,
200 .release = regs_dbg_release,
201 };
202
203 static void usba_ep_init_debugfs(struct usba_udc *udc,
204 struct usba_ep *ep)
205 {
206 struct dentry *ep_root;
207
208 ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
209 if (!ep_root)
210 goto err_root;
211 ep->debugfs_dir = ep_root;
212
213 ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
214 ep, &queue_dbg_fops);
215 if (!ep->debugfs_queue)
216 goto err_queue;
217
218 if (ep->can_dma) {
219 ep->debugfs_dma_status
220 = debugfs_create_u32("dma_status", 0400, ep_root,
221 &ep->last_dma_status);
222 if (!ep->debugfs_dma_status)
223 goto err_dma_status;
224 }
225 if (ep_is_control(ep)) {
226 ep->debugfs_state
227 = debugfs_create_u32("state", 0400, ep_root,
228 &ep->state);
229 if (!ep->debugfs_state)
230 goto err_state;
231 }
232
233 return;
234
235 err_state:
236 if (ep->can_dma)
237 debugfs_remove(ep->debugfs_dma_status);
238 err_dma_status:
239 debugfs_remove(ep->debugfs_queue);
240 err_queue:
241 debugfs_remove(ep_root);
242 err_root:
243 dev_err(&ep->udc->pdev->dev,
244 "failed to create debugfs directory for %s\n", ep->ep.name);
245 }
246
247 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
248 {
249 debugfs_remove(ep->debugfs_queue);
250 debugfs_remove(ep->debugfs_dma_status);
251 debugfs_remove(ep->debugfs_state);
252 debugfs_remove(ep->debugfs_dir);
253 ep->debugfs_dma_status = NULL;
254 ep->debugfs_dir = NULL;
255 }
256
257 static void usba_init_debugfs(struct usba_udc *udc)
258 {
259 struct dentry *root, *regs;
260 struct resource *regs_resource;
261
262 root = debugfs_create_dir(udc->gadget.name, NULL);
263 if (IS_ERR(root) || !root)
264 goto err_root;
265 udc->debugfs_root = root;
266
267 regs = debugfs_create_file("regs", 0400, root, udc, &regs_dbg_fops);
268 if (!regs)
269 goto err_regs;
270
271 regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
272 CTRL_IOMEM_ID);
273 regs->d_inode->i_size = resource_size(regs_resource);
274 udc->debugfs_regs = regs;
275
276 usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
277
278 return;
279
280 err_regs:
281 debugfs_remove(root);
282 err_root:
283 udc->debugfs_root = NULL;
284 dev_err(&udc->pdev->dev, "debugfs is not available\n");
285 }
286
287 static void usba_cleanup_debugfs(struct usba_udc *udc)
288 {
289 usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
290 debugfs_remove(udc->debugfs_regs);
291 debugfs_remove(udc->debugfs_root);
292 udc->debugfs_regs = NULL;
293 udc->debugfs_root = NULL;
294 }
295 #else
296 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
297 struct usba_ep *ep)
298 {
299
300 }
301
302 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
303 {
304
305 }
306
307 static inline void usba_init_debugfs(struct usba_udc *udc)
308 {
309
310 }
311
312 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
313 {
314
315 }
316 #endif
317
318 static int vbus_is_present(struct usba_udc *udc)
319 {
320 if (gpio_is_valid(udc->vbus_pin))
321 return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
322
323 /* No Vbus detection: Assume always present */
324 return 1;
325 }
326
327 #if defined(CONFIG_ARCH_AT91SAM9RL)
328
329 #include <mach/at91_pmc.h>
330
331 static void toggle_bias(int is_on)
332 {
333 unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
334
335 if (is_on)
336 at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
337 else
338 at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
339 }
340
341 #else
342
343 static void toggle_bias(int is_on)
344 {
345 }
346
347 #endif /* CONFIG_ARCH_AT91SAM9RL */
348
349 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
350 {
351 unsigned int transaction_len;
352
353 transaction_len = req->req.length - req->req.actual;
354 req->last_transaction = 1;
355 if (transaction_len > ep->ep.maxpacket) {
356 transaction_len = ep->ep.maxpacket;
357 req->last_transaction = 0;
358 } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
359 req->last_transaction = 0;
360
361 DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
362 ep->ep.name, req, transaction_len,
363 req->last_transaction ? ", done" : "");
364
365 memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
366 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
367 req->req.actual += transaction_len;
368 }
369
370 static void submit_request(struct usba_ep *ep, struct usba_request *req)
371 {
372 DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
373 ep->ep.name, req, req->req.length);
374
375 req->req.actual = 0;
376 req->submitted = 1;
377
378 if (req->using_dma) {
379 if (req->req.length == 0) {
380 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
381 return;
382 }
383
384 if (req->req.zero)
385 usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
386 else
387 usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
388
389 usba_dma_writel(ep, ADDRESS, req->req.dma);
390 usba_dma_writel(ep, CONTROL, req->ctrl);
391 } else {
392 next_fifo_transaction(ep, req);
393 if (req->last_transaction) {
394 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
395 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
396 } else {
397 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
398 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
399 }
400 }
401 }
402
403 static void submit_next_request(struct usba_ep *ep)
404 {
405 struct usba_request *req;
406
407 if (list_empty(&ep->queue)) {
408 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
409 return;
410 }
411
412 req = list_entry(ep->queue.next, struct usba_request, queue);
413 if (!req->submitted)
414 submit_request(ep, req);
415 }
416
417 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
418 {
419 ep->state = STATUS_STAGE_IN;
420 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
421 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
422 }
423
424 static void receive_data(struct usba_ep *ep)
425 {
426 struct usba_udc *udc = ep->udc;
427 struct usba_request *req;
428 unsigned long status;
429 unsigned int bytecount, nr_busy;
430 int is_complete = 0;
431
432 status = usba_ep_readl(ep, STA);
433 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
434
435 DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
436
437 while (nr_busy > 0) {
438 if (list_empty(&ep->queue)) {
439 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
440 break;
441 }
442 req = list_entry(ep->queue.next,
443 struct usba_request, queue);
444
445 bytecount = USBA_BFEXT(BYTE_COUNT, status);
446
447 if (status & (1 << 31))
448 is_complete = 1;
449 if (req->req.actual + bytecount >= req->req.length) {
450 is_complete = 1;
451 bytecount = req->req.length - req->req.actual;
452 }
453
454 memcpy_fromio(req->req.buf + req->req.actual,
455 ep->fifo, bytecount);
456 req->req.actual += bytecount;
457
458 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
459
460 if (is_complete) {
461 DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
462 req->req.status = 0;
463 list_del_init(&req->queue);
464 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
465 spin_unlock(&udc->lock);
466 req->req.complete(&ep->ep, &req->req);
467 spin_lock(&udc->lock);
468 }
469
470 status = usba_ep_readl(ep, STA);
471 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
472
473 if (is_complete && ep_is_control(ep)) {
474 send_status(udc, ep);
475 break;
476 }
477 }
478 }
479
480 static void
481 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
482 {
483 struct usba_udc *udc = ep->udc;
484
485 WARN_ON(!list_empty(&req->queue));
486
487 if (req->req.status == -EINPROGRESS)
488 req->req.status = status;
489
490 if (req->using_dma)
491 usb_gadget_unmap_request(&udc->gadget, &req->req, ep->is_in);
492
493 DBG(DBG_GADGET | DBG_REQ,
494 "%s: req %p complete: status %d, actual %u\n",
495 ep->ep.name, req, req->req.status, req->req.actual);
496
497 spin_unlock(&udc->lock);
498 req->req.complete(&ep->ep, &req->req);
499 spin_lock(&udc->lock);
500 }
501
502 static void
503 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
504 {
505 struct usba_request *req, *tmp_req;
506
507 list_for_each_entry_safe(req, tmp_req, list, queue) {
508 list_del_init(&req->queue);
509 request_complete(ep, req, status);
510 }
511 }
512
513 static int
514 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
515 {
516 struct usba_ep *ep = to_usba_ep(_ep);
517 struct usba_udc *udc = ep->udc;
518 unsigned long flags, ept_cfg, maxpacket;
519 unsigned int nr_trans;
520
521 DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
522
523 maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
524
525 if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
526 || ep->index == 0
527 || desc->bDescriptorType != USB_DT_ENDPOINT
528 || maxpacket == 0
529 || maxpacket > ep->fifo_size) {
530 DBG(DBG_ERR, "ep_enable: Invalid argument");
531 return -EINVAL;
532 }
533
534 ep->is_isoc = 0;
535 ep->is_in = 0;
536
537 if (maxpacket <= 8)
538 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
539 else
540 /* LSB is bit 1, not 0 */
541 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
542
543 DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
544 ep->ep.name, ept_cfg, maxpacket);
545
546 if (usb_endpoint_dir_in(desc)) {
547 ep->is_in = 1;
548 ept_cfg |= USBA_EPT_DIR_IN;
549 }
550
551 switch (usb_endpoint_type(desc)) {
552 case USB_ENDPOINT_XFER_CONTROL:
553 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
554 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
555 break;
556 case USB_ENDPOINT_XFER_ISOC:
557 if (!ep->can_isoc) {
558 DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
559 ep->ep.name);
560 return -EINVAL;
561 }
562
563 /*
564 * Bits 11:12 specify number of _additional_
565 * transactions per microframe.
566 */
567 nr_trans = ((usb_endpoint_maxp(desc) >> 11) & 3) + 1;
568 if (nr_trans > 3)
569 return -EINVAL;
570
571 ep->is_isoc = 1;
572 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
573
574 /*
575 * Do triple-buffering on high-bandwidth iso endpoints.
576 */
577 if (nr_trans > 1 && ep->nr_banks == 3)
578 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
579 else
580 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
581 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
582 break;
583 case USB_ENDPOINT_XFER_BULK:
584 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
585 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
586 break;
587 case USB_ENDPOINT_XFER_INT:
588 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
589 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
590 break;
591 }
592
593 spin_lock_irqsave(&ep->udc->lock, flags);
594
595 ep->ep.desc = desc;
596 ep->ep.maxpacket = maxpacket;
597
598 usba_ep_writel(ep, CFG, ept_cfg);
599 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
600
601 if (ep->can_dma) {
602 u32 ctrl;
603
604 usba_writel(udc, INT_ENB,
605 (usba_readl(udc, INT_ENB)
606 | USBA_BF(EPT_INT, 1 << ep->index)
607 | USBA_BF(DMA_INT, 1 << ep->index)));
608 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
609 usba_ep_writel(ep, CTL_ENB, ctrl);
610 } else {
611 usba_writel(udc, INT_ENB,
612 (usba_readl(udc, INT_ENB)
613 | USBA_BF(EPT_INT, 1 << ep->index)));
614 }
615
616 spin_unlock_irqrestore(&udc->lock, flags);
617
618 DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
619 (unsigned long)usba_ep_readl(ep, CFG));
620 DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
621 (unsigned long)usba_readl(udc, INT_ENB));
622
623 return 0;
624 }
625
626 static int usba_ep_disable(struct usb_ep *_ep)
627 {
628 struct usba_ep *ep = to_usba_ep(_ep);
629 struct usba_udc *udc = ep->udc;
630 LIST_HEAD(req_list);
631 unsigned long flags;
632
633 DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
634
635 spin_lock_irqsave(&udc->lock, flags);
636
637 if (!ep->ep.desc) {
638 spin_unlock_irqrestore(&udc->lock, flags);
639 /* REVISIT because this driver disables endpoints in
640 * reset_all_endpoints() before calling disconnect(),
641 * most gadget drivers would trigger this non-error ...
642 */
643 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
644 DBG(DBG_ERR, "ep_disable: %s not enabled\n",
645 ep->ep.name);
646 return -EINVAL;
647 }
648 ep->ep.desc = NULL;
649
650 list_splice_init(&ep->queue, &req_list);
651 if (ep->can_dma) {
652 usba_dma_writel(ep, CONTROL, 0);
653 usba_dma_writel(ep, ADDRESS, 0);
654 usba_dma_readl(ep, STATUS);
655 }
656 usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
657 usba_writel(udc, INT_ENB,
658 usba_readl(udc, INT_ENB)
659 & ~USBA_BF(EPT_INT, 1 << ep->index));
660
661 request_complete_list(ep, &req_list, -ESHUTDOWN);
662
663 spin_unlock_irqrestore(&udc->lock, flags);
664
665 return 0;
666 }
667
668 static struct usb_request *
669 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
670 {
671 struct usba_request *req;
672
673 DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
674
675 req = kzalloc(sizeof(*req), gfp_flags);
676 if (!req)
677 return NULL;
678
679 INIT_LIST_HEAD(&req->queue);
680
681 return &req->req;
682 }
683
684 static void
685 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
686 {
687 struct usba_request *req = to_usba_req(_req);
688
689 DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
690
691 kfree(req);
692 }
693
694 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
695 struct usba_request *req, gfp_t gfp_flags)
696 {
697 unsigned long flags;
698 int ret;
699
700 DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
701 ep->ep.name, req->req.length, req->req.dma,
702 req->req.zero ? 'Z' : 'z',
703 req->req.short_not_ok ? 'S' : 's',
704 req->req.no_interrupt ? 'I' : 'i');
705
706 if (req->req.length > 0x10000) {
707 /* Lengths from 0 to 65536 (inclusive) are supported */
708 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
709 return -EINVAL;
710 }
711
712 ret = usb_gadget_map_request(&udc->gadget, &req->req, ep->is_in);
713 if (ret)
714 return ret;
715
716 req->using_dma = 1;
717 req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
718 | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
719 | USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
720
721 if (ep->is_in)
722 req->ctrl |= USBA_DMA_END_BUF_EN;
723
724 /*
725 * Add this request to the queue and submit for DMA if
726 * possible. Check if we're still alive first -- we may have
727 * received a reset since last time we checked.
728 */
729 ret = -ESHUTDOWN;
730 spin_lock_irqsave(&udc->lock, flags);
731 if (ep->ep.desc) {
732 if (list_empty(&ep->queue))
733 submit_request(ep, req);
734
735 list_add_tail(&req->queue, &ep->queue);
736 ret = 0;
737 }
738 spin_unlock_irqrestore(&udc->lock, flags);
739
740 return ret;
741 }
742
743 static int
744 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
745 {
746 struct usba_request *req = to_usba_req(_req);
747 struct usba_ep *ep = to_usba_ep(_ep);
748 struct usba_udc *udc = ep->udc;
749 unsigned long flags;
750 int ret;
751
752 DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
753 ep->ep.name, req, _req->length);
754
755 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
756 !ep->ep.desc)
757 return -ESHUTDOWN;
758
759 req->submitted = 0;
760 req->using_dma = 0;
761 req->last_transaction = 0;
762
763 _req->status = -EINPROGRESS;
764 _req->actual = 0;
765
766 if (ep->can_dma)
767 return queue_dma(udc, ep, req, gfp_flags);
768
769 /* May have received a reset since last time we checked */
770 ret = -ESHUTDOWN;
771 spin_lock_irqsave(&udc->lock, flags);
772 if (ep->ep.desc) {
773 list_add_tail(&req->queue, &ep->queue);
774
775 if ((!ep_is_control(ep) && ep->is_in) ||
776 (ep_is_control(ep)
777 && (ep->state == DATA_STAGE_IN
778 || ep->state == STATUS_STAGE_IN)))
779 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
780 else
781 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
782 ret = 0;
783 }
784 spin_unlock_irqrestore(&udc->lock, flags);
785
786 return ret;
787 }
788
789 static void
790 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
791 {
792 req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
793 }
794
795 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
796 {
797 unsigned int timeout;
798 u32 status;
799
800 /*
801 * Stop the DMA controller. When writing both CH_EN
802 * and LINK to 0, the other bits are not affected.
803 */
804 usba_dma_writel(ep, CONTROL, 0);
805
806 /* Wait for the FIFO to empty */
807 for (timeout = 40; timeout; --timeout) {
808 status = usba_dma_readl(ep, STATUS);
809 if (!(status & USBA_DMA_CH_EN))
810 break;
811 udelay(1);
812 }
813
814 if (pstatus)
815 *pstatus = status;
816
817 if (timeout == 0) {
818 dev_err(&ep->udc->pdev->dev,
819 "%s: timed out waiting for DMA FIFO to empty\n",
820 ep->ep.name);
821 return -ETIMEDOUT;
822 }
823
824 return 0;
825 }
826
827 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
828 {
829 struct usba_ep *ep = to_usba_ep(_ep);
830 struct usba_udc *udc = ep->udc;
831 struct usba_request *req = to_usba_req(_req);
832 unsigned long flags;
833 u32 status;
834
835 DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
836 ep->ep.name, req);
837
838 spin_lock_irqsave(&udc->lock, flags);
839
840 if (req->using_dma) {
841 /*
842 * If this request is currently being transferred,
843 * stop the DMA controller and reset the FIFO.
844 */
845 if (ep->queue.next == &req->queue) {
846 status = usba_dma_readl(ep, STATUS);
847 if (status & USBA_DMA_CH_EN)
848 stop_dma(ep, &status);
849
850 #ifdef CONFIG_USB_GADGET_DEBUG_FS
851 ep->last_dma_status = status;
852 #endif
853
854 usba_writel(udc, EPT_RST, 1 << ep->index);
855
856 usba_update_req(ep, req, status);
857 }
858 }
859
860 /*
861 * Errors should stop the queue from advancing until the
862 * completion function returns.
863 */
864 list_del_init(&req->queue);
865
866 request_complete(ep, req, -ECONNRESET);
867
868 /* Process the next request if any */
869 submit_next_request(ep);
870 spin_unlock_irqrestore(&udc->lock, flags);
871
872 return 0;
873 }
874
875 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
876 {
877 struct usba_ep *ep = to_usba_ep(_ep);
878 struct usba_udc *udc = ep->udc;
879 unsigned long flags;
880 int ret = 0;
881
882 DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
883 value ? "set" : "clear");
884
885 if (!ep->ep.desc) {
886 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
887 ep->ep.name);
888 return -ENODEV;
889 }
890 if (ep->is_isoc) {
891 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
892 ep->ep.name);
893 return -ENOTTY;
894 }
895
896 spin_lock_irqsave(&udc->lock, flags);
897
898 /*
899 * We can't halt IN endpoints while there are still data to be
900 * transferred
901 */
902 if (!list_empty(&ep->queue)
903 || ((value && ep->is_in && (usba_ep_readl(ep, STA)
904 & USBA_BF(BUSY_BANKS, -1L))))) {
905 ret = -EAGAIN;
906 } else {
907 if (value)
908 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
909 else
910 usba_ep_writel(ep, CLR_STA,
911 USBA_FORCE_STALL | USBA_TOGGLE_CLR);
912 usba_ep_readl(ep, STA);
913 }
914
915 spin_unlock_irqrestore(&udc->lock, flags);
916
917 return ret;
918 }
919
920 static int usba_ep_fifo_status(struct usb_ep *_ep)
921 {
922 struct usba_ep *ep = to_usba_ep(_ep);
923
924 return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
925 }
926
927 static void usba_ep_fifo_flush(struct usb_ep *_ep)
928 {
929 struct usba_ep *ep = to_usba_ep(_ep);
930 struct usba_udc *udc = ep->udc;
931
932 usba_writel(udc, EPT_RST, 1 << ep->index);
933 }
934
935 static const struct usb_ep_ops usba_ep_ops = {
936 .enable = usba_ep_enable,
937 .disable = usba_ep_disable,
938 .alloc_request = usba_ep_alloc_request,
939 .free_request = usba_ep_free_request,
940 .queue = usba_ep_queue,
941 .dequeue = usba_ep_dequeue,
942 .set_halt = usba_ep_set_halt,
943 .fifo_status = usba_ep_fifo_status,
944 .fifo_flush = usba_ep_fifo_flush,
945 };
946
947 static int usba_udc_get_frame(struct usb_gadget *gadget)
948 {
949 struct usba_udc *udc = to_usba_udc(gadget);
950
951 return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
952 }
953
954 static int usba_udc_wakeup(struct usb_gadget *gadget)
955 {
956 struct usba_udc *udc = to_usba_udc(gadget);
957 unsigned long flags;
958 u32 ctrl;
959 int ret = -EINVAL;
960
961 spin_lock_irqsave(&udc->lock, flags);
962 if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
963 ctrl = usba_readl(udc, CTRL);
964 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
965 ret = 0;
966 }
967 spin_unlock_irqrestore(&udc->lock, flags);
968
969 return ret;
970 }
971
972 static int
973 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
974 {
975 struct usba_udc *udc = to_usba_udc(gadget);
976 unsigned long flags;
977
978 spin_lock_irqsave(&udc->lock, flags);
979 if (is_selfpowered)
980 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
981 else
982 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
983 spin_unlock_irqrestore(&udc->lock, flags);
984
985 return 0;
986 }
987
988 static int atmel_usba_start(struct usb_gadget *gadget,
989 struct usb_gadget_driver *driver);
990 static int atmel_usba_stop(struct usb_gadget *gadget,
991 struct usb_gadget_driver *driver);
992 static const struct usb_gadget_ops usba_udc_ops = {
993 .get_frame = usba_udc_get_frame,
994 .wakeup = usba_udc_wakeup,
995 .set_selfpowered = usba_udc_set_selfpowered,
996 .udc_start = atmel_usba_start,
997 .udc_stop = atmel_usba_stop,
998 };
999
1000 static struct usb_endpoint_descriptor usba_ep0_desc = {
1001 .bLength = USB_DT_ENDPOINT_SIZE,
1002 .bDescriptorType = USB_DT_ENDPOINT,
1003 .bEndpointAddress = 0,
1004 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1005 .wMaxPacketSize = cpu_to_le16(64),
1006 /* FIXME: I have no idea what to put here */
1007 .bInterval = 1,
1008 };
1009
1010 static void nop_release(struct device *dev)
1011 {
1012
1013 }
1014
1015 struct usb_gadget usba_gadget_template = {
1016 .ops = &usba_udc_ops,
1017 .max_speed = USB_SPEED_HIGH,
1018 .name = "atmel_usba_udc",
1019 .dev = {
1020 .init_name = "gadget",
1021 .release = nop_release,
1022 },
1023 };
1024
1025 /*
1026 * Called with interrupts disabled and udc->lock held.
1027 */
1028 static void reset_all_endpoints(struct usba_udc *udc)
1029 {
1030 struct usba_ep *ep;
1031 struct usba_request *req, *tmp_req;
1032
1033 usba_writel(udc, EPT_RST, ~0UL);
1034
1035 ep = to_usba_ep(udc->gadget.ep0);
1036 list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1037 list_del_init(&req->queue);
1038 request_complete(ep, req, -ECONNRESET);
1039 }
1040
1041 /* NOTE: normally, the next call to the gadget driver is in
1042 * charge of disabling endpoints... usually disconnect().
1043 * The exception would be entering a high speed test mode.
1044 *
1045 * FIXME remove this code ... and retest thoroughly.
1046 */
1047 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1048 if (ep->ep.desc) {
1049 spin_unlock(&udc->lock);
1050 usba_ep_disable(&ep->ep);
1051 spin_lock(&udc->lock);
1052 }
1053 }
1054 }
1055
1056 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1057 {
1058 struct usba_ep *ep;
1059
1060 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1061 return to_usba_ep(udc->gadget.ep0);
1062
1063 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1064 u8 bEndpointAddress;
1065
1066 if (!ep->ep.desc)
1067 continue;
1068 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1069 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1070 continue;
1071 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1072 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1073 return ep;
1074 }
1075
1076 return NULL;
1077 }
1078
1079 /* Called with interrupts disabled and udc->lock held */
1080 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1081 {
1082 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1083 ep->state = WAIT_FOR_SETUP;
1084 }
1085
1086 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1087 {
1088 if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1089 return 1;
1090 return 0;
1091 }
1092
1093 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1094 {
1095 u32 regval;
1096
1097 DBG(DBG_BUS, "setting address %u...\n", addr);
1098 regval = usba_readl(udc, CTRL);
1099 regval = USBA_BFINS(DEV_ADDR, addr, regval);
1100 usba_writel(udc, CTRL, regval);
1101 }
1102
1103 static int do_test_mode(struct usba_udc *udc)
1104 {
1105 static const char test_packet_buffer[] = {
1106 /* JKJKJKJK * 9 */
1107 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1108 /* JJKKJJKK * 8 */
1109 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1110 /* JJKKJJKK * 8 */
1111 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1112 /* JJJJJJJKKKKKKK * 8 */
1113 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1114 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1115 /* JJJJJJJK * 8 */
1116 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1117 /* {JKKKKKKK * 10}, JK */
1118 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1119 };
1120 struct usba_ep *ep;
1121 struct device *dev = &udc->pdev->dev;
1122 int test_mode;
1123
1124 test_mode = udc->test_mode;
1125
1126 /* Start from a clean slate */
1127 reset_all_endpoints(udc);
1128
1129 switch (test_mode) {
1130 case 0x0100:
1131 /* Test_J */
1132 usba_writel(udc, TST, USBA_TST_J_MODE);
1133 dev_info(dev, "Entering Test_J mode...\n");
1134 break;
1135 case 0x0200:
1136 /* Test_K */
1137 usba_writel(udc, TST, USBA_TST_K_MODE);
1138 dev_info(dev, "Entering Test_K mode...\n");
1139 break;
1140 case 0x0300:
1141 /*
1142 * Test_SE0_NAK: Force high-speed mode and set up ep0
1143 * for Bulk IN transfers
1144 */
1145 ep = &udc->usba_ep[0];
1146 usba_writel(udc, TST,
1147 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1148 usba_ep_writel(ep, CFG,
1149 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1150 | USBA_EPT_DIR_IN
1151 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1152 | USBA_BF(BK_NUMBER, 1));
1153 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1154 set_protocol_stall(udc, ep);
1155 dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1156 } else {
1157 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1158 dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1159 }
1160 break;
1161 case 0x0400:
1162 /* Test_Packet */
1163 ep = &udc->usba_ep[0];
1164 usba_ep_writel(ep, CFG,
1165 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1166 | USBA_EPT_DIR_IN
1167 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1168 | USBA_BF(BK_NUMBER, 1));
1169 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1170 set_protocol_stall(udc, ep);
1171 dev_err(dev, "Test_Packet: ep0 not mapped\n");
1172 } else {
1173 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1174 usba_writel(udc, TST, USBA_TST_PKT_MODE);
1175 memcpy_toio(ep->fifo, test_packet_buffer,
1176 sizeof(test_packet_buffer));
1177 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1178 dev_info(dev, "Entering Test_Packet mode...\n");
1179 }
1180 break;
1181 default:
1182 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1183 return -EINVAL;
1184 }
1185
1186 return 0;
1187 }
1188
1189 /* Avoid overly long expressions */
1190 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1191 {
1192 if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1193 return true;
1194 return false;
1195 }
1196
1197 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1198 {
1199 if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1200 return true;
1201 return false;
1202 }
1203
1204 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1205 {
1206 if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1207 return true;
1208 return false;
1209 }
1210
1211 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1212 struct usb_ctrlrequest *crq)
1213 {
1214 int retval = 0;
1215
1216 switch (crq->bRequest) {
1217 case USB_REQ_GET_STATUS: {
1218 u16 status;
1219
1220 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1221 status = cpu_to_le16(udc->devstatus);
1222 } else if (crq->bRequestType
1223 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1224 status = cpu_to_le16(0);
1225 } else if (crq->bRequestType
1226 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1227 struct usba_ep *target;
1228
1229 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1230 if (!target)
1231 goto stall;
1232
1233 status = 0;
1234 if (is_stalled(udc, target))
1235 status |= cpu_to_le16(1);
1236 } else
1237 goto delegate;
1238
1239 /* Write directly to the FIFO. No queueing is done. */
1240 if (crq->wLength != cpu_to_le16(sizeof(status)))
1241 goto stall;
1242 ep->state = DATA_STAGE_IN;
1243 __raw_writew(status, ep->fifo);
1244 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1245 break;
1246 }
1247
1248 case USB_REQ_CLEAR_FEATURE: {
1249 if (crq->bRequestType == USB_RECIP_DEVICE) {
1250 if (feature_is_dev_remote_wakeup(crq))
1251 udc->devstatus
1252 &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1253 else
1254 /* Can't CLEAR_FEATURE TEST_MODE */
1255 goto stall;
1256 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1257 struct usba_ep *target;
1258
1259 if (crq->wLength != cpu_to_le16(0)
1260 || !feature_is_ep_halt(crq))
1261 goto stall;
1262 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1263 if (!target)
1264 goto stall;
1265
1266 usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1267 if (target->index != 0)
1268 usba_ep_writel(target, CLR_STA,
1269 USBA_TOGGLE_CLR);
1270 } else {
1271 goto delegate;
1272 }
1273
1274 send_status(udc, ep);
1275 break;
1276 }
1277
1278 case USB_REQ_SET_FEATURE: {
1279 if (crq->bRequestType == USB_RECIP_DEVICE) {
1280 if (feature_is_dev_test_mode(crq)) {
1281 send_status(udc, ep);
1282 ep->state = STATUS_STAGE_TEST;
1283 udc->test_mode = le16_to_cpu(crq->wIndex);
1284 return 0;
1285 } else if (feature_is_dev_remote_wakeup(crq)) {
1286 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1287 } else {
1288 goto stall;
1289 }
1290 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1291 struct usba_ep *target;
1292
1293 if (crq->wLength != cpu_to_le16(0)
1294 || !feature_is_ep_halt(crq))
1295 goto stall;
1296
1297 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1298 if (!target)
1299 goto stall;
1300
1301 usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1302 } else
1303 goto delegate;
1304
1305 send_status(udc, ep);
1306 break;
1307 }
1308
1309 case USB_REQ_SET_ADDRESS:
1310 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1311 goto delegate;
1312
1313 set_address(udc, le16_to_cpu(crq->wValue));
1314 send_status(udc, ep);
1315 ep->state = STATUS_STAGE_ADDR;
1316 break;
1317
1318 default:
1319 delegate:
1320 spin_unlock(&udc->lock);
1321 retval = udc->driver->setup(&udc->gadget, crq);
1322 spin_lock(&udc->lock);
1323 }
1324
1325 return retval;
1326
1327 stall:
1328 pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1329 "halting endpoint...\n",
1330 ep->ep.name, crq->bRequestType, crq->bRequest,
1331 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1332 le16_to_cpu(crq->wLength));
1333 set_protocol_stall(udc, ep);
1334 return -1;
1335 }
1336
1337 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1338 {
1339 struct usba_request *req;
1340 u32 epstatus;
1341 u32 epctrl;
1342
1343 restart:
1344 epstatus = usba_ep_readl(ep, STA);
1345 epctrl = usba_ep_readl(ep, CTL);
1346
1347 DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1348 ep->ep.name, ep->state, epstatus, epctrl);
1349
1350 req = NULL;
1351 if (!list_empty(&ep->queue))
1352 req = list_entry(ep->queue.next,
1353 struct usba_request, queue);
1354
1355 if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1356 if (req->submitted)
1357 next_fifo_transaction(ep, req);
1358 else
1359 submit_request(ep, req);
1360
1361 if (req->last_transaction) {
1362 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1363 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1364 }
1365 goto restart;
1366 }
1367 if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1368 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1369
1370 switch (ep->state) {
1371 case DATA_STAGE_IN:
1372 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1373 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1374 ep->state = STATUS_STAGE_OUT;
1375 break;
1376 case STATUS_STAGE_ADDR:
1377 /* Activate our new address */
1378 usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1379 | USBA_FADDR_EN));
1380 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1381 ep->state = WAIT_FOR_SETUP;
1382 break;
1383 case STATUS_STAGE_IN:
1384 if (req) {
1385 list_del_init(&req->queue);
1386 request_complete(ep, req, 0);
1387 submit_next_request(ep);
1388 }
1389 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1390 ep->state = WAIT_FOR_SETUP;
1391 break;
1392 case STATUS_STAGE_TEST:
1393 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1394 ep->state = WAIT_FOR_SETUP;
1395 if (do_test_mode(udc))
1396 set_protocol_stall(udc, ep);
1397 break;
1398 default:
1399 pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1400 "halting endpoint...\n",
1401 ep->ep.name, ep->state);
1402 set_protocol_stall(udc, ep);
1403 break;
1404 }
1405
1406 goto restart;
1407 }
1408 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1409 switch (ep->state) {
1410 case STATUS_STAGE_OUT:
1411 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1412 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1413
1414 if (req) {
1415 list_del_init(&req->queue);
1416 request_complete(ep, req, 0);
1417 }
1418 ep->state = WAIT_FOR_SETUP;
1419 break;
1420
1421 case DATA_STAGE_OUT:
1422 receive_data(ep);
1423 break;
1424
1425 default:
1426 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1427 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1428 pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1429 "halting endpoint...\n",
1430 ep->ep.name, ep->state);
1431 set_protocol_stall(udc, ep);
1432 break;
1433 }
1434
1435 goto restart;
1436 }
1437 if (epstatus & USBA_RX_SETUP) {
1438 union {
1439 struct usb_ctrlrequest crq;
1440 unsigned long data[2];
1441 } crq;
1442 unsigned int pkt_len;
1443 int ret;
1444
1445 if (ep->state != WAIT_FOR_SETUP) {
1446 /*
1447 * Didn't expect a SETUP packet at this
1448 * point. Clean up any pending requests (which
1449 * may be successful).
1450 */
1451 int status = -EPROTO;
1452
1453 /*
1454 * RXRDY and TXCOMP are dropped when SETUP
1455 * packets arrive. Just pretend we received
1456 * the status packet.
1457 */
1458 if (ep->state == STATUS_STAGE_OUT
1459 || ep->state == STATUS_STAGE_IN) {
1460 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1461 status = 0;
1462 }
1463
1464 if (req) {
1465 list_del_init(&req->queue);
1466 request_complete(ep, req, status);
1467 }
1468 }
1469
1470 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1471 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1472 if (pkt_len != sizeof(crq)) {
1473 pr_warning("udc: Invalid packet length %u "
1474 "(expected %zu)\n", pkt_len, sizeof(crq));
1475 set_protocol_stall(udc, ep);
1476 return;
1477 }
1478
1479 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1480 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1481
1482 /* Free up one bank in the FIFO so that we can
1483 * generate or receive a reply right away. */
1484 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1485
1486 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1487 ep->state, crq.crq.bRequestType,
1488 crq.crq.bRequest); */
1489
1490 if (crq.crq.bRequestType & USB_DIR_IN) {
1491 /*
1492 * The USB 2.0 spec states that "if wLength is
1493 * zero, there is no data transfer phase."
1494 * However, testusb #14 seems to actually
1495 * expect a data phase even if wLength = 0...
1496 */
1497 ep->state = DATA_STAGE_IN;
1498 } else {
1499 if (crq.crq.wLength != cpu_to_le16(0))
1500 ep->state = DATA_STAGE_OUT;
1501 else
1502 ep->state = STATUS_STAGE_IN;
1503 }
1504
1505 ret = -1;
1506 if (ep->index == 0)
1507 ret = handle_ep0_setup(udc, ep, &crq.crq);
1508 else {
1509 spin_unlock(&udc->lock);
1510 ret = udc->driver->setup(&udc->gadget, &crq.crq);
1511 spin_lock(&udc->lock);
1512 }
1513
1514 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1515 crq.crq.bRequestType, crq.crq.bRequest,
1516 le16_to_cpu(crq.crq.wLength), ep->state, ret);
1517
1518 if (ret < 0) {
1519 /* Let the host know that we failed */
1520 set_protocol_stall(udc, ep);
1521 }
1522 }
1523 }
1524
1525 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1526 {
1527 struct usba_request *req;
1528 u32 epstatus;
1529 u32 epctrl;
1530
1531 epstatus = usba_ep_readl(ep, STA);
1532 epctrl = usba_ep_readl(ep, CTL);
1533
1534 DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1535
1536 while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1537 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1538
1539 if (list_empty(&ep->queue)) {
1540 dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1541 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1542 return;
1543 }
1544
1545 req = list_entry(ep->queue.next, struct usba_request, queue);
1546
1547 if (req->using_dma) {
1548 /* Send a zero-length packet */
1549 usba_ep_writel(ep, SET_STA,
1550 USBA_TX_PK_RDY);
1551 usba_ep_writel(ep, CTL_DIS,
1552 USBA_TX_PK_RDY);
1553 list_del_init(&req->queue);
1554 submit_next_request(ep);
1555 request_complete(ep, req, 0);
1556 } else {
1557 if (req->submitted)
1558 next_fifo_transaction(ep, req);
1559 else
1560 submit_request(ep, req);
1561
1562 if (req->last_transaction) {
1563 list_del_init(&req->queue);
1564 submit_next_request(ep);
1565 request_complete(ep, req, 0);
1566 }
1567 }
1568
1569 epstatus = usba_ep_readl(ep, STA);
1570 epctrl = usba_ep_readl(ep, CTL);
1571 }
1572 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1573 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1574 receive_data(ep);
1575 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1576 }
1577 }
1578
1579 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1580 {
1581 struct usba_request *req;
1582 u32 status, control, pending;
1583
1584 status = usba_dma_readl(ep, STATUS);
1585 control = usba_dma_readl(ep, CONTROL);
1586 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1587 ep->last_dma_status = status;
1588 #endif
1589 pending = status & control;
1590 DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1591
1592 if (status & USBA_DMA_CH_EN) {
1593 dev_err(&udc->pdev->dev,
1594 "DMA_CH_EN is set after transfer is finished!\n");
1595 dev_err(&udc->pdev->dev,
1596 "status=%#08x, pending=%#08x, control=%#08x\n",
1597 status, pending, control);
1598
1599 /*
1600 * try to pretend nothing happened. We might have to
1601 * do something here...
1602 */
1603 }
1604
1605 if (list_empty(&ep->queue))
1606 /* Might happen if a reset comes along at the right moment */
1607 return;
1608
1609 if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1610 req = list_entry(ep->queue.next, struct usba_request, queue);
1611 usba_update_req(ep, req, status);
1612
1613 list_del_init(&req->queue);
1614 submit_next_request(ep);
1615 request_complete(ep, req, 0);
1616 }
1617 }
1618
1619 static irqreturn_t usba_udc_irq(int irq, void *devid)
1620 {
1621 struct usba_udc *udc = devid;
1622 u32 status;
1623 u32 dma_status;
1624 u32 ep_status;
1625
1626 spin_lock(&udc->lock);
1627
1628 status = usba_readl(udc, INT_STA);
1629 DBG(DBG_INT, "irq, status=%#08x\n", status);
1630
1631 if (status & USBA_DET_SUSPEND) {
1632 toggle_bias(0);
1633 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1634 DBG(DBG_BUS, "Suspend detected\n");
1635 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1636 && udc->driver && udc->driver->suspend) {
1637 spin_unlock(&udc->lock);
1638 udc->driver->suspend(&udc->gadget);
1639 spin_lock(&udc->lock);
1640 }
1641 }
1642
1643 if (status & USBA_WAKE_UP) {
1644 toggle_bias(1);
1645 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1646 DBG(DBG_BUS, "Wake Up CPU detected\n");
1647 }
1648
1649 if (status & USBA_END_OF_RESUME) {
1650 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1651 DBG(DBG_BUS, "Resume detected\n");
1652 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1653 && udc->driver && udc->driver->resume) {
1654 spin_unlock(&udc->lock);
1655 udc->driver->resume(&udc->gadget);
1656 spin_lock(&udc->lock);
1657 }
1658 }
1659
1660 dma_status = USBA_BFEXT(DMA_INT, status);
1661 if (dma_status) {
1662 int i;
1663
1664 for (i = 1; i < USBA_NR_ENDPOINTS; i++)
1665 if (dma_status & (1 << i))
1666 usba_dma_irq(udc, &udc->usba_ep[i]);
1667 }
1668
1669 ep_status = USBA_BFEXT(EPT_INT, status);
1670 if (ep_status) {
1671 int i;
1672
1673 for (i = 0; i < USBA_NR_ENDPOINTS; i++)
1674 if (ep_status & (1 << i)) {
1675 if (ep_is_control(&udc->usba_ep[i]))
1676 usba_control_irq(udc, &udc->usba_ep[i]);
1677 else
1678 usba_ep_irq(udc, &udc->usba_ep[i]);
1679 }
1680 }
1681
1682 if (status & USBA_END_OF_RESET) {
1683 struct usba_ep *ep0;
1684
1685 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1686 reset_all_endpoints(udc);
1687
1688 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1689 && udc->driver->disconnect) {
1690 udc->gadget.speed = USB_SPEED_UNKNOWN;
1691 spin_unlock(&udc->lock);
1692 udc->driver->disconnect(&udc->gadget);
1693 spin_lock(&udc->lock);
1694 }
1695
1696 if (status & USBA_HIGH_SPEED)
1697 udc->gadget.speed = USB_SPEED_HIGH;
1698 else
1699 udc->gadget.speed = USB_SPEED_FULL;
1700 DBG(DBG_BUS, "%s bus reset detected\n",
1701 usb_speed_string(udc->gadget.speed));
1702
1703 ep0 = &udc->usba_ep[0];
1704 ep0->ep.desc = &usba_ep0_desc;
1705 ep0->state = WAIT_FOR_SETUP;
1706 usba_ep_writel(ep0, CFG,
1707 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1708 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1709 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1710 usba_ep_writel(ep0, CTL_ENB,
1711 USBA_EPT_ENABLE | USBA_RX_SETUP);
1712 usba_writel(udc, INT_ENB,
1713 (usba_readl(udc, INT_ENB)
1714 | USBA_BF(EPT_INT, 1)
1715 | USBA_DET_SUSPEND
1716 | USBA_END_OF_RESUME));
1717
1718 /*
1719 * Unclear why we hit this irregularly, e.g. in usbtest,
1720 * but it's clearly harmless...
1721 */
1722 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1723 dev_dbg(&udc->pdev->dev,
1724 "ODD: EP0 configuration is invalid!\n");
1725 }
1726
1727 spin_unlock(&udc->lock);
1728
1729 return IRQ_HANDLED;
1730 }
1731
1732 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1733 {
1734 struct usba_udc *udc = devid;
1735 int vbus;
1736
1737 /* debounce */
1738 udelay(10);
1739
1740 spin_lock(&udc->lock);
1741
1742 /* May happen if Vbus pin toggles during probe() */
1743 if (!udc->driver)
1744 goto out;
1745
1746 vbus = vbus_is_present(udc);
1747 if (vbus != udc->vbus_prev) {
1748 if (vbus) {
1749 toggle_bias(1);
1750 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1751 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1752 } else {
1753 udc->gadget.speed = USB_SPEED_UNKNOWN;
1754 reset_all_endpoints(udc);
1755 toggle_bias(0);
1756 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1757 if (udc->driver->disconnect) {
1758 spin_unlock(&udc->lock);
1759 udc->driver->disconnect(&udc->gadget);
1760 spin_lock(&udc->lock);
1761 }
1762 }
1763 udc->vbus_prev = vbus;
1764 }
1765
1766 out:
1767 spin_unlock(&udc->lock);
1768
1769 return IRQ_HANDLED;
1770 }
1771
1772 static int atmel_usba_start(struct usb_gadget *gadget,
1773 struct usb_gadget_driver *driver)
1774 {
1775 int ret;
1776 struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1777 unsigned long flags;
1778
1779 spin_lock_irqsave(&udc->lock, flags);
1780
1781 udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1782 udc->driver = driver;
1783 spin_unlock_irqrestore(&udc->lock, flags);
1784
1785 ret = clk_prepare_enable(udc->pclk);
1786 if (ret)
1787 return ret;
1788 ret = clk_prepare_enable(udc->hclk);
1789 if (ret) {
1790 clk_disable_unprepare(udc->pclk);
1791 return ret;
1792 }
1793
1794 DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1795
1796 udc->vbus_prev = 0;
1797 if (gpio_is_valid(udc->vbus_pin))
1798 enable_irq(gpio_to_irq(udc->vbus_pin));
1799
1800 /* If Vbus is present, enable the controller and wait for reset */
1801 spin_lock_irqsave(&udc->lock, flags);
1802 if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1803 toggle_bias(1);
1804 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1805 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1806 }
1807 spin_unlock_irqrestore(&udc->lock, flags);
1808
1809 return 0;
1810 }
1811
1812 static int atmel_usba_stop(struct usb_gadget *gadget,
1813 struct usb_gadget_driver *driver)
1814 {
1815 struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1816 unsigned long flags;
1817
1818 if (gpio_is_valid(udc->vbus_pin))
1819 disable_irq(gpio_to_irq(udc->vbus_pin));
1820
1821 spin_lock_irqsave(&udc->lock, flags);
1822 udc->gadget.speed = USB_SPEED_UNKNOWN;
1823 reset_all_endpoints(udc);
1824 spin_unlock_irqrestore(&udc->lock, flags);
1825
1826 /* This will also disable the DP pullup */
1827 toggle_bias(0);
1828 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1829
1830 udc->driver = NULL;
1831
1832 clk_disable_unprepare(udc->hclk);
1833 clk_disable_unprepare(udc->pclk);
1834
1835 DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
1836
1837 return 0;
1838 }
1839
1840 #ifdef CONFIG_OF
1841 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1842 struct usba_udc *udc)
1843 {
1844 u32 val;
1845 const char *name;
1846 enum of_gpio_flags flags;
1847 struct device_node *np = pdev->dev.of_node;
1848 struct device_node *pp;
1849 int i, ret;
1850 struct usba_ep *eps, *ep;
1851
1852 udc->num_ep = 0;
1853
1854 udc->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1855 &flags);
1856 udc->vbus_pin_inverted = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1857
1858 pp = NULL;
1859 while ((pp = of_get_next_child(np, pp)))
1860 udc->num_ep++;
1861
1862 eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * udc->num_ep,
1863 GFP_KERNEL);
1864 if (!eps)
1865 return ERR_PTR(-ENOMEM);
1866
1867 udc->gadget.ep0 = &eps[0].ep;
1868
1869 INIT_LIST_HEAD(&eps[0].ep.ep_list);
1870
1871 pp = NULL;
1872 i = 0;
1873 while ((pp = of_get_next_child(np, pp))) {
1874 ep = &eps[i];
1875
1876 ret = of_property_read_u32(pp, "reg", &val);
1877 if (ret) {
1878 dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
1879 goto err;
1880 }
1881 ep->index = val;
1882
1883 ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
1884 if (ret) {
1885 dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
1886 goto err;
1887 }
1888 ep->fifo_size = val;
1889
1890 ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
1891 if (ret) {
1892 dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
1893 goto err;
1894 }
1895 ep->nr_banks = val;
1896
1897 ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
1898 ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");
1899
1900 ret = of_property_read_string(pp, "name", &name);
1901 ep->ep.name = name;
1902
1903 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1904 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1905 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1906 ep->ep.ops = &usba_ep_ops;
1907 ep->ep.maxpacket = ep->fifo_size;
1908 ep->udc = udc;
1909 INIT_LIST_HEAD(&ep->queue);
1910
1911 if (i)
1912 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1913
1914 i++;
1915 }
1916
1917 return eps;
1918 err:
1919 return ERR_PTR(ret);
1920 }
1921 #else
1922 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1923 struct usba_udc *udc)
1924 {
1925 return ERR_PTR(-ENOSYS);
1926 }
1927 #endif
1928
1929 static struct usba_ep * usba_udc_pdata(struct platform_device *pdev,
1930 struct usba_udc *udc)
1931 {
1932 struct usba_platform_data *pdata = dev_get_platdata(&pdev->dev);
1933 struct usba_ep *eps;
1934 int i;
1935
1936 if (!pdata)
1937 return ERR_PTR(-ENXIO);
1938
1939 eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * pdata->num_ep,
1940 GFP_KERNEL);
1941 if (!eps)
1942 return ERR_PTR(-ENOMEM);
1943
1944 udc->gadget.ep0 = &eps[0].ep;
1945
1946 udc->vbus_pin = pdata->vbus_pin;
1947 udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
1948 udc->num_ep = pdata->num_ep;
1949
1950 INIT_LIST_HEAD(&eps[0].ep.ep_list);
1951
1952 for (i = 0; i < pdata->num_ep; i++) {
1953 struct usba_ep *ep = &eps[i];
1954
1955 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1956 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1957 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1958 ep->ep.ops = &usba_ep_ops;
1959 ep->ep.name = pdata->ep[i].name;
1960 ep->fifo_size = ep->ep.maxpacket = pdata->ep[i].fifo_size;
1961 ep->udc = udc;
1962 INIT_LIST_HEAD(&ep->queue);
1963 ep->nr_banks = pdata->ep[i].nr_banks;
1964 ep->index = pdata->ep[i].index;
1965 ep->can_dma = pdata->ep[i].can_dma;
1966 ep->can_isoc = pdata->ep[i].can_isoc;
1967
1968 if (i)
1969 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1970 }
1971
1972 return eps;
1973 }
1974
1975 static int __init usba_udc_probe(struct platform_device *pdev)
1976 {
1977 struct resource *regs, *fifo;
1978 struct clk *pclk, *hclk;
1979 struct usba_udc *udc;
1980 int irq, ret, i;
1981
1982 udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
1983 if (!udc)
1984 return -ENOMEM;
1985
1986 udc->gadget = usba_gadget_template;
1987 INIT_LIST_HEAD(&udc->gadget.ep_list);
1988
1989 regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1990 fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1991 if (!regs || !fifo)
1992 return -ENXIO;
1993
1994 irq = platform_get_irq(pdev, 0);
1995 if (irq < 0)
1996 return irq;
1997
1998 pclk = clk_get(&pdev->dev, "pclk");
1999 if (IS_ERR(pclk))
2000 return PTR_ERR(pclk);
2001 hclk = clk_get(&pdev->dev, "hclk");
2002 if (IS_ERR(hclk)) {
2003 ret = PTR_ERR(hclk);
2004 goto err_get_hclk;
2005 }
2006
2007 spin_lock_init(&udc->lock);
2008 udc->pdev = pdev;
2009 udc->pclk = pclk;
2010 udc->hclk = hclk;
2011 udc->vbus_pin = -ENODEV;
2012
2013 ret = -ENOMEM;
2014 udc->regs = ioremap(regs->start, resource_size(regs));
2015 if (!udc->regs) {
2016 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
2017 goto err_map_regs;
2018 }
2019 dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
2020 (unsigned long)regs->start, udc->regs);
2021 udc->fifo = ioremap(fifo->start, resource_size(fifo));
2022 if (!udc->fifo) {
2023 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
2024 goto err_map_fifo;
2025 }
2026 dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
2027 (unsigned long)fifo->start, udc->fifo);
2028
2029 platform_set_drvdata(pdev, udc);
2030
2031 /* Make sure we start from a clean slate */
2032 ret = clk_prepare_enable(pclk);
2033 if (ret) {
2034 dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
2035 goto err_clk_enable;
2036 }
2037 toggle_bias(0);
2038 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
2039 clk_disable_unprepare(pclk);
2040
2041 if (pdev->dev.of_node)
2042 udc->usba_ep = atmel_udc_of_init(pdev, udc);
2043 else
2044 udc->usba_ep = usba_udc_pdata(pdev, udc);
2045
2046 if (IS_ERR(udc->usba_ep)) {
2047 ret = PTR_ERR(udc->usba_ep);
2048 goto err_alloc_ep;
2049 }
2050
2051 ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
2052 if (ret) {
2053 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
2054 irq, ret);
2055 goto err_request_irq;
2056 }
2057 udc->irq = irq;
2058
2059 if (gpio_is_valid(udc->vbus_pin)) {
2060 if (!devm_gpio_request(&pdev->dev, udc->vbus_pin, "atmel_usba_udc")) {
2061 ret = request_irq(gpio_to_irq(udc->vbus_pin),
2062 usba_vbus_irq, 0,
2063 "atmel_usba_udc", udc);
2064 if (ret) {
2065 udc->vbus_pin = -ENODEV;
2066 dev_warn(&udc->pdev->dev,
2067 "failed to request vbus irq; "
2068 "assuming always on\n");
2069 } else {
2070 disable_irq(gpio_to_irq(udc->vbus_pin));
2071 }
2072 } else {
2073 /* gpio_request fail so use -EINVAL for gpio_is_valid */
2074 udc->vbus_pin = -EINVAL;
2075 }
2076 }
2077
2078 ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2079 if (ret)
2080 goto err_add_udc;
2081
2082 usba_init_debugfs(udc);
2083 for (i = 1; i < udc->num_ep; i++)
2084 usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
2085
2086 return 0;
2087
2088 err_add_udc:
2089 if (gpio_is_valid(udc->vbus_pin))
2090 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2091
2092 free_irq(irq, udc);
2093 err_request_irq:
2094 err_alloc_ep:
2095 err_clk_enable:
2096 iounmap(udc->fifo);
2097 err_map_fifo:
2098 iounmap(udc->regs);
2099 err_map_regs:
2100 clk_put(hclk);
2101 err_get_hclk:
2102 clk_put(pclk);
2103
2104 return ret;
2105 }
2106
2107 static int __exit usba_udc_remove(struct platform_device *pdev)
2108 {
2109 struct usba_udc *udc;
2110 int i;
2111
2112 udc = platform_get_drvdata(pdev);
2113
2114 usb_del_gadget_udc(&udc->gadget);
2115
2116 for (i = 1; i < udc->num_ep; i++)
2117 usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
2118 usba_cleanup_debugfs(udc);
2119
2120 if (gpio_is_valid(udc->vbus_pin)) {
2121 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2122 }
2123
2124 free_irq(udc->irq, udc);
2125 iounmap(udc->fifo);
2126 iounmap(udc->regs);
2127 clk_put(udc->hclk);
2128 clk_put(udc->pclk);
2129
2130 return 0;
2131 }
2132
2133 #if defined(CONFIG_OF)
2134 static const struct of_device_id atmel_udc_dt_ids[] = {
2135 { .compatible = "atmel,at91sam9rl-udc" },
2136 { /* sentinel */ }
2137 };
2138
2139 MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
2140 #endif
2141
2142 static struct platform_driver udc_driver = {
2143 .remove = __exit_p(usba_udc_remove),
2144 .driver = {
2145 .name = "atmel_usba_udc",
2146 .owner = THIS_MODULE,
2147 .of_match_table = of_match_ptr(atmel_udc_dt_ids),
2148 },
2149 };
2150
2151 module_platform_driver_probe(udc_driver, usba_udc_probe);
2152
2153 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2154 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2155 MODULE_LICENSE("GPL");
2156 MODULE_ALIAS("platform:atmel_usba_udc");
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