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
31 static struct usba_udc the_udc;
32 static struct usba_ep *usba_ep;
33
34 #ifdef CONFIG_USB_GADGET_DEBUG_FS
35 #include <linux/debugfs.h>
36 #include <linux/uaccess.h>
37
queue_dbg_open(struct inode * inode,struct file * file)38 static 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
61 fail:
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 */
queue_dbg_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)85 static 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
queue_dbg_release(struct inode * inode,struct file * file)128 static 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
regs_dbg_open(struct inode * inode,struct file * file)141 static 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
162 out:
163 mutex_unlock(&inode->i_mutex);
164
165 return ret;
166 }
167
regs_dbg_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)168 static 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
regs_dbg_release(struct inode * inode,struct file * file)183 static int regs_dbg_release(struct inode *inode, struct file *file)
184 {
185 kfree(file->private_data);
186 return 0;
187 }
188
189 const 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
197 const 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
usba_ep_init_debugfs(struct usba_udc * udc,struct usba_ep * ep)205 static 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
237 err_state:
238 if (ep->can_dma)
239 debugfs_remove(ep->debugfs_dma_status);
240 err_dma_status:
241 debugfs_remove(ep->debugfs_queue);
242 err_queue:
243 debugfs_remove(ep_root);
244 err_root:
245 dev_err(&ep->udc->pdev->dev,
246 "failed to create debugfs directory for %s\n", ep->ep.name);
247 }
248
usba_ep_cleanup_debugfs(struct usba_ep * ep)249 static 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
usba_init_debugfs(struct usba_udc * udc)259 static 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
282 err_regs:
283 debugfs_remove(root);
284 err_root:
285 udc->debugfs_root = NULL;
286 dev_err(&udc->pdev->dev, "debugfs is not available\n");
287 }
288
usba_cleanup_debugfs(struct usba_udc * udc)289 static 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
usba_ep_init_debugfs(struct usba_udc * udc,struct usba_ep * ep)298 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
299 struct usba_ep *ep)
300 {
301
302 }
303
usba_ep_cleanup_debugfs(struct usba_ep * ep)304 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
305 {
306
307 }
308
usba_init_debugfs(struct usba_udc * udc)309 static inline void usba_init_debugfs(struct usba_udc *udc)
310 {
311
312 }
313
usba_cleanup_debugfs(struct usba_udc * udc)314 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
315 {
316
317 }
318 #endif
319
vbus_is_present(struct usba_udc * udc)320 static 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
toggle_bias(int is_on)333 static 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
toggle_bias(int is_on)345 static void toggle_bias(int is_on)
346 {
347 }
348
349 #endif /* CONFIG_ARCH_AT91SAM9RL */
350
next_fifo_transaction(struct usba_ep * ep,struct usba_request * req)351 static 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
submit_request(struct usba_ep * ep,struct usba_request * req)372 static 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
submit_next_request(struct usba_ep * ep)405 static 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
send_status(struct usba_udc * udc,struct usba_ep * ep)419 static 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
receive_data(struct usba_ep * ep)426 static 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
482 static void
request_complete(struct usba_ep * ep,struct usba_request * req,int status)483 request_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
509 static void
request_complete_list(struct usba_ep * ep,struct list_head * list,int status)510 request_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
520 static int
usba_ep_enable(struct usb_ep * _ep,const struct usb_endpoint_descriptor * desc)521 usba_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 if (ep->desc) {
603 spin_unlock_irqrestore(&ep->udc->lock, flags);
604 DBG(DBG_ERR, "ep%d already enabled\n", ep->index);
605 return -EBUSY;
606 }
607
608 ep->desc = desc;
609 ep->ep.maxpacket = maxpacket;
610
611 usba_ep_writel(ep, CFG, ept_cfg);
612 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
613
614 if (ep->can_dma) {
615 u32 ctrl;
616
617 usba_writel(udc, INT_ENB,
618 (usba_readl(udc, INT_ENB)
619 | USBA_BF(EPT_INT, 1 << ep->index)
620 | USBA_BF(DMA_INT, 1 << ep->index)));
621 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
622 usba_ep_writel(ep, CTL_ENB, ctrl);
623 } else {
624 usba_writel(udc, INT_ENB,
625 (usba_readl(udc, INT_ENB)
626 | USBA_BF(EPT_INT, 1 << ep->index)));
627 }
628
629 spin_unlock_irqrestore(&udc->lock, flags);
630
631 DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
632 (unsigned long)usba_ep_readl(ep, CFG));
633 DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
634 (unsigned long)usba_readl(udc, INT_ENB));
635
636 return 0;
637 }
638
usba_ep_disable(struct usb_ep * _ep)639 static int usba_ep_disable(struct usb_ep *_ep)
640 {
641 struct usba_ep *ep = to_usba_ep(_ep);
642 struct usba_udc *udc = ep->udc;
643 LIST_HEAD(req_list);
644 unsigned long flags;
645
646 DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
647
648 spin_lock_irqsave(&udc->lock, flags);
649
650 if (!ep->desc) {
651 spin_unlock_irqrestore(&udc->lock, flags);
652 /* REVISIT because this driver disables endpoints in
653 * reset_all_endpoints() before calling disconnect(),
654 * most gadget drivers would trigger this non-error ...
655 */
656 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
657 DBG(DBG_ERR, "ep_disable: %s not enabled\n",
658 ep->ep.name);
659 return -EINVAL;
660 }
661 ep->desc = NULL;
662 ep->ep.desc = NULL;
663
664 list_splice_init(&ep->queue, &req_list);
665 if (ep->can_dma) {
666 usba_dma_writel(ep, CONTROL, 0);
667 usba_dma_writel(ep, ADDRESS, 0);
668 usba_dma_readl(ep, STATUS);
669 }
670 usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
671 usba_writel(udc, INT_ENB,
672 usba_readl(udc, INT_ENB)
673 & ~USBA_BF(EPT_INT, 1 << ep->index));
674
675 request_complete_list(ep, &req_list, -ESHUTDOWN);
676
677 spin_unlock_irqrestore(&udc->lock, flags);
678
679 return 0;
680 }
681
682 static struct usb_request *
usba_ep_alloc_request(struct usb_ep * _ep,gfp_t gfp_flags)683 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
684 {
685 struct usba_request *req;
686
687 DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
688
689 req = kzalloc(sizeof(*req), gfp_flags);
690 if (!req)
691 return NULL;
692
693 INIT_LIST_HEAD(&req->queue);
694 req->req.dma = DMA_ADDR_INVALID;
695
696 return &req->req;
697 }
698
699 static void
usba_ep_free_request(struct usb_ep * _ep,struct usb_request * _req)700 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
701 {
702 struct usba_request *req = to_usba_req(_req);
703
704 DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
705
706 kfree(req);
707 }
708
queue_dma(struct usba_udc * udc,struct usba_ep * ep,struct usba_request * req,gfp_t gfp_flags)709 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
710 struct usba_request *req, gfp_t gfp_flags)
711 {
712 unsigned long flags;
713 int ret;
714
715 DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
716 ep->ep.name, req->req.length, req->req.dma,
717 req->req.zero ? 'Z' : 'z',
718 req->req.short_not_ok ? 'S' : 's',
719 req->req.no_interrupt ? 'I' : 'i');
720
721 if (req->req.length > 0x10000) {
722 /* Lengths from 0 to 65536 (inclusive) are supported */
723 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
724 return -EINVAL;
725 }
726
727 req->using_dma = 1;
728
729 if (req->req.dma == DMA_ADDR_INVALID) {
730 req->req.dma = dma_map_single(
731 &udc->pdev->dev, req->req.buf, req->req.length,
732 ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
733 req->mapped = 1;
734 } else {
735 dma_sync_single_for_device(
736 &udc->pdev->dev, req->req.dma, req->req.length,
737 ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
738 req->mapped = 0;
739 }
740
741 req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
742 | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
743 | USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
744
745 if (ep->is_in)
746 req->ctrl |= USBA_DMA_END_BUF_EN;
747
748 /*
749 * Add this request to the queue and submit for DMA if
750 * possible. Check if we're still alive first -- we may have
751 * received a reset since last time we checked.
752 */
753 ret = -ESHUTDOWN;
754 spin_lock_irqsave(&udc->lock, flags);
755 if (ep->desc) {
756 if (list_empty(&ep->queue))
757 submit_request(ep, req);
758
759 list_add_tail(&req->queue, &ep->queue);
760 ret = 0;
761 }
762 spin_unlock_irqrestore(&udc->lock, flags);
763
764 return ret;
765 }
766
767 static int
usba_ep_queue(struct usb_ep * _ep,struct usb_request * _req,gfp_t gfp_flags)768 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
769 {
770 struct usba_request *req = to_usba_req(_req);
771 struct usba_ep *ep = to_usba_ep(_ep);
772 struct usba_udc *udc = ep->udc;
773 unsigned long flags;
774 int ret;
775
776 DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
777 ep->ep.name, req, _req->length);
778
779 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN || !ep->desc)
780 return -ESHUTDOWN;
781
782 req->submitted = 0;
783 req->using_dma = 0;
784 req->last_transaction = 0;
785
786 _req->status = -EINPROGRESS;
787 _req->actual = 0;
788
789 if (ep->can_dma)
790 return queue_dma(udc, ep, req, gfp_flags);
791
792 /* May have received a reset since last time we checked */
793 ret = -ESHUTDOWN;
794 spin_lock_irqsave(&udc->lock, flags);
795 if (ep->desc) {
796 list_add_tail(&req->queue, &ep->queue);
797
798 if ((!ep_is_control(ep) && ep->is_in) ||
799 (ep_is_control(ep)
800 && (ep->state == DATA_STAGE_IN
801 || ep->state == STATUS_STAGE_IN)))
802 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
803 else
804 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
805 ret = 0;
806 }
807 spin_unlock_irqrestore(&udc->lock, flags);
808
809 return ret;
810 }
811
812 static void
usba_update_req(struct usba_ep * ep,struct usba_request * req,u32 status)813 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
814 {
815 req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
816 }
817
stop_dma(struct usba_ep * ep,u32 * pstatus)818 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
819 {
820 unsigned int timeout;
821 u32 status;
822
823 /*
824 * Stop the DMA controller. When writing both CH_EN
825 * and LINK to 0, the other bits are not affected.
826 */
827 usba_dma_writel(ep, CONTROL, 0);
828
829 /* Wait for the FIFO to empty */
830 for (timeout = 40; timeout; --timeout) {
831 status = usba_dma_readl(ep, STATUS);
832 if (!(status & USBA_DMA_CH_EN))
833 break;
834 udelay(1);
835 }
836
837 if (pstatus)
838 *pstatus = status;
839
840 if (timeout == 0) {
841 dev_err(&ep->udc->pdev->dev,
842 "%s: timed out waiting for DMA FIFO to empty\n",
843 ep->ep.name);
844 return -ETIMEDOUT;
845 }
846
847 return 0;
848 }
849
usba_ep_dequeue(struct usb_ep * _ep,struct usb_request * _req)850 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
851 {
852 struct usba_ep *ep = to_usba_ep(_ep);
853 struct usba_udc *udc = ep->udc;
854 struct usba_request *req = to_usba_req(_req);
855 unsigned long flags;
856 u32 status;
857
858 DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
859 ep->ep.name, req);
860
861 spin_lock_irqsave(&udc->lock, flags);
862
863 if (req->using_dma) {
864 /*
865 * If this request is currently being transferred,
866 * stop the DMA controller and reset the FIFO.
867 */
868 if (ep->queue.next == &req->queue) {
869 status = usba_dma_readl(ep, STATUS);
870 if (status & USBA_DMA_CH_EN)
871 stop_dma(ep, &status);
872
873 #ifdef CONFIG_USB_GADGET_DEBUG_FS
874 ep->last_dma_status = status;
875 #endif
876
877 usba_writel(udc, EPT_RST, 1 << ep->index);
878
879 usba_update_req(ep, req, status);
880 }
881 }
882
883 /*
884 * Errors should stop the queue from advancing until the
885 * completion function returns.
886 */
887 list_del_init(&req->queue);
888
889 request_complete(ep, req, -ECONNRESET);
890
891 /* Process the next request if any */
892 submit_next_request(ep);
893 spin_unlock_irqrestore(&udc->lock, flags);
894
895 return 0;
896 }
897
usba_ep_set_halt(struct usb_ep * _ep,int value)898 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
899 {
900 struct usba_ep *ep = to_usba_ep(_ep);
901 struct usba_udc *udc = ep->udc;
902 unsigned long flags;
903 int ret = 0;
904
905 DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
906 value ? "set" : "clear");
907
908 if (!ep->desc) {
909 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
910 ep->ep.name);
911 return -ENODEV;
912 }
913 if (ep->is_isoc) {
914 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
915 ep->ep.name);
916 return -ENOTTY;
917 }
918
919 spin_lock_irqsave(&udc->lock, flags);
920
921 /*
922 * We can't halt IN endpoints while there are still data to be
923 * transferred
924 */
925 if (!list_empty(&ep->queue)
926 || ((value && ep->is_in && (usba_ep_readl(ep, STA)
927 & USBA_BF(BUSY_BANKS, -1L))))) {
928 ret = -EAGAIN;
929 } else {
930 if (value)
931 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
932 else
933 usba_ep_writel(ep, CLR_STA,
934 USBA_FORCE_STALL | USBA_TOGGLE_CLR);
935 usba_ep_readl(ep, STA);
936 }
937
938 spin_unlock_irqrestore(&udc->lock, flags);
939
940 return ret;
941 }
942
usba_ep_fifo_status(struct usb_ep * _ep)943 static int usba_ep_fifo_status(struct usb_ep *_ep)
944 {
945 struct usba_ep *ep = to_usba_ep(_ep);
946
947 return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
948 }
949
usba_ep_fifo_flush(struct usb_ep * _ep)950 static void usba_ep_fifo_flush(struct usb_ep *_ep)
951 {
952 struct usba_ep *ep = to_usba_ep(_ep);
953 struct usba_udc *udc = ep->udc;
954
955 usba_writel(udc, EPT_RST, 1 << ep->index);
956 }
957
958 static const struct usb_ep_ops usba_ep_ops = {
959 .enable = usba_ep_enable,
960 .disable = usba_ep_disable,
961 .alloc_request = usba_ep_alloc_request,
962 .free_request = usba_ep_free_request,
963 .queue = usba_ep_queue,
964 .dequeue = usba_ep_dequeue,
965 .set_halt = usba_ep_set_halt,
966 .fifo_status = usba_ep_fifo_status,
967 .fifo_flush = usba_ep_fifo_flush,
968 };
969
usba_udc_get_frame(struct usb_gadget * gadget)970 static int usba_udc_get_frame(struct usb_gadget *gadget)
971 {
972 struct usba_udc *udc = to_usba_udc(gadget);
973
974 return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
975 }
976
usba_udc_wakeup(struct usb_gadget * gadget)977 static int usba_udc_wakeup(struct usb_gadget *gadget)
978 {
979 struct usba_udc *udc = to_usba_udc(gadget);
980 unsigned long flags;
981 u32 ctrl;
982 int ret = -EINVAL;
983
984 spin_lock_irqsave(&udc->lock, flags);
985 if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
986 ctrl = usba_readl(udc, CTRL);
987 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
988 ret = 0;
989 }
990 spin_unlock_irqrestore(&udc->lock, flags);
991
992 return ret;
993 }
994
995 static int
usba_udc_set_selfpowered(struct usb_gadget * gadget,int is_selfpowered)996 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
997 {
998 struct usba_udc *udc = to_usba_udc(gadget);
999 unsigned long flags;
1000
1001 spin_lock_irqsave(&udc->lock, flags);
1002 if (is_selfpowered)
1003 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
1004 else
1005 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1006 spin_unlock_irqrestore(&udc->lock, flags);
1007
1008 return 0;
1009 }
1010
1011 static int atmel_usba_start(struct usb_gadget_driver *driver,
1012 int (*bind)(struct usb_gadget *));
1013 static int atmel_usba_stop(struct usb_gadget_driver *driver);
1014
1015 static const struct usb_gadget_ops usba_udc_ops = {
1016 .get_frame = usba_udc_get_frame,
1017 .wakeup = usba_udc_wakeup,
1018 .set_selfpowered = usba_udc_set_selfpowered,
1019 .start = atmel_usba_start,
1020 .stop = atmel_usba_stop,
1021 };
1022
1023 static struct usb_endpoint_descriptor usba_ep0_desc = {
1024 .bLength = USB_DT_ENDPOINT_SIZE,
1025 .bDescriptorType = USB_DT_ENDPOINT,
1026 .bEndpointAddress = 0,
1027 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1028 .wMaxPacketSize = cpu_to_le16(64),
1029 /* FIXME: I have no idea what to put here */
1030 .bInterval = 1,
1031 };
1032
nop_release(struct device * dev)1033 static void nop_release(struct device *dev)
1034 {
1035
1036 }
1037
1038 static struct usba_udc the_udc = {
1039 .gadget = {
1040 .ops = &usba_udc_ops,
1041 .ep_list = LIST_HEAD_INIT(the_udc.gadget.ep_list),
1042 .max_speed = USB_SPEED_HIGH,
1043 .name = "atmel_usba_udc",
1044 .dev = {
1045 .init_name = "gadget",
1046 .release = nop_release,
1047 },
1048 },
1049 };
1050
1051 /*
1052 * Called with interrupts disabled and udc->lock held.
1053 */
reset_all_endpoints(struct usba_udc * udc)1054 static void reset_all_endpoints(struct usba_udc *udc)
1055 {
1056 struct usba_ep *ep;
1057 struct usba_request *req, *tmp_req;
1058
1059 usba_writel(udc, EPT_RST, ~0UL);
1060
1061 ep = to_usba_ep(udc->gadget.ep0);
1062 list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1063 list_del_init(&req->queue);
1064 request_complete(ep, req, -ECONNRESET);
1065 }
1066
1067 /* NOTE: normally, the next call to the gadget driver is in
1068 * charge of disabling endpoints... usually disconnect().
1069 * The exception would be entering a high speed test mode.
1070 *
1071 * FIXME remove this code ... and retest thoroughly.
1072 */
1073 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1074 if (ep->desc) {
1075 spin_unlock(&udc->lock);
1076 usba_ep_disable(&ep->ep);
1077 spin_lock(&udc->lock);
1078 }
1079 }
1080 }
1081
get_ep_by_addr(struct usba_udc * udc,u16 wIndex)1082 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1083 {
1084 struct usba_ep *ep;
1085
1086 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1087 return to_usba_ep(udc->gadget.ep0);
1088
1089 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1090 u8 bEndpointAddress;
1091
1092 if (!ep->desc)
1093 continue;
1094 bEndpointAddress = ep->desc->bEndpointAddress;
1095 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1096 continue;
1097 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1098 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1099 return ep;
1100 }
1101
1102 return NULL;
1103 }
1104
1105 /* Called with interrupts disabled and udc->lock held */
set_protocol_stall(struct usba_udc * udc,struct usba_ep * ep)1106 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1107 {
1108 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1109 ep->state = WAIT_FOR_SETUP;
1110 }
1111
is_stalled(struct usba_udc * udc,struct usba_ep * ep)1112 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1113 {
1114 if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1115 return 1;
1116 return 0;
1117 }
1118
set_address(struct usba_udc * udc,unsigned int addr)1119 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1120 {
1121 u32 regval;
1122
1123 DBG(DBG_BUS, "setting address %u...\n", addr);
1124 regval = usba_readl(udc, CTRL);
1125 regval = USBA_BFINS(DEV_ADDR, addr, regval);
1126 usba_writel(udc, CTRL, regval);
1127 }
1128
do_test_mode(struct usba_udc * udc)1129 static int do_test_mode(struct usba_udc *udc)
1130 {
1131 static const char test_packet_buffer[] = {
1132 /* JKJKJKJK * 9 */
1133 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1134 /* JJKKJJKK * 8 */
1135 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1136 /* JJKKJJKK * 8 */
1137 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1138 /* JJJJJJJKKKKKKK * 8 */
1139 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1140 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1141 /* JJJJJJJK * 8 */
1142 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1143 /* {JKKKKKKK * 10}, JK */
1144 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1145 };
1146 struct usba_ep *ep;
1147 struct device *dev = &udc->pdev->dev;
1148 int test_mode;
1149
1150 test_mode = udc->test_mode;
1151
1152 /* Start from a clean slate */
1153 reset_all_endpoints(udc);
1154
1155 switch (test_mode) {
1156 case 0x0100:
1157 /* Test_J */
1158 usba_writel(udc, TST, USBA_TST_J_MODE);
1159 dev_info(dev, "Entering Test_J mode...\n");
1160 break;
1161 case 0x0200:
1162 /* Test_K */
1163 usba_writel(udc, TST, USBA_TST_K_MODE);
1164 dev_info(dev, "Entering Test_K mode...\n");
1165 break;
1166 case 0x0300:
1167 /*
1168 * Test_SE0_NAK: Force high-speed mode and set up ep0
1169 * for Bulk IN transfers
1170 */
1171 ep = &usba_ep[0];
1172 usba_writel(udc, TST,
1173 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1174 usba_ep_writel(ep, CFG,
1175 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1176 | USBA_EPT_DIR_IN
1177 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1178 | USBA_BF(BK_NUMBER, 1));
1179 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1180 set_protocol_stall(udc, ep);
1181 dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1182 } else {
1183 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1184 dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1185 }
1186 break;
1187 case 0x0400:
1188 /* Test_Packet */
1189 ep = &usba_ep[0];
1190 usba_ep_writel(ep, CFG,
1191 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1192 | USBA_EPT_DIR_IN
1193 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1194 | USBA_BF(BK_NUMBER, 1));
1195 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1196 set_protocol_stall(udc, ep);
1197 dev_err(dev, "Test_Packet: ep0 not mapped\n");
1198 } else {
1199 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1200 usba_writel(udc, TST, USBA_TST_PKT_MODE);
1201 memcpy_toio(ep->fifo, test_packet_buffer,
1202 sizeof(test_packet_buffer));
1203 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1204 dev_info(dev, "Entering Test_Packet mode...\n");
1205 }
1206 break;
1207 default:
1208 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1209 return -EINVAL;
1210 }
1211
1212 return 0;
1213 }
1214
1215 /* Avoid overly long expressions */
feature_is_dev_remote_wakeup(struct usb_ctrlrequest * crq)1216 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1217 {
1218 if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1219 return true;
1220 return false;
1221 }
1222
feature_is_dev_test_mode(struct usb_ctrlrequest * crq)1223 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1224 {
1225 if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1226 return true;
1227 return false;
1228 }
1229
feature_is_ep_halt(struct usb_ctrlrequest * crq)1230 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1231 {
1232 if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1233 return true;
1234 return false;
1235 }
1236
handle_ep0_setup(struct usba_udc * udc,struct usba_ep * ep,struct usb_ctrlrequest * crq)1237 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1238 struct usb_ctrlrequest *crq)
1239 {
1240 int retval = 0;
1241
1242 switch (crq->bRequest) {
1243 case USB_REQ_GET_STATUS: {
1244 u16 status;
1245
1246 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1247 status = cpu_to_le16(udc->devstatus);
1248 } else if (crq->bRequestType
1249 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1250 status = cpu_to_le16(0);
1251 } else if (crq->bRequestType
1252 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1253 struct usba_ep *target;
1254
1255 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1256 if (!target)
1257 goto stall;
1258
1259 status = 0;
1260 if (is_stalled(udc, target))
1261 status |= cpu_to_le16(1);
1262 } else
1263 goto delegate;
1264
1265 /* Write directly to the FIFO. No queueing is done. */
1266 if (crq->wLength != cpu_to_le16(sizeof(status)))
1267 goto stall;
1268 ep->state = DATA_STAGE_IN;
1269 __raw_writew(status, ep->fifo);
1270 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1271 break;
1272 }
1273
1274 case USB_REQ_CLEAR_FEATURE: {
1275 if (crq->bRequestType == USB_RECIP_DEVICE) {
1276 if (feature_is_dev_remote_wakeup(crq))
1277 udc->devstatus
1278 &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1279 else
1280 /* Can't CLEAR_FEATURE TEST_MODE */
1281 goto stall;
1282 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1283 struct usba_ep *target;
1284
1285 if (crq->wLength != cpu_to_le16(0)
1286 || !feature_is_ep_halt(crq))
1287 goto stall;
1288 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1289 if (!target)
1290 goto stall;
1291
1292 usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1293 if (target->index != 0)
1294 usba_ep_writel(target, CLR_STA,
1295 USBA_TOGGLE_CLR);
1296 } else {
1297 goto delegate;
1298 }
1299
1300 send_status(udc, ep);
1301 break;
1302 }
1303
1304 case USB_REQ_SET_FEATURE: {
1305 if (crq->bRequestType == USB_RECIP_DEVICE) {
1306 if (feature_is_dev_test_mode(crq)) {
1307 send_status(udc, ep);
1308 ep->state = STATUS_STAGE_TEST;
1309 udc->test_mode = le16_to_cpu(crq->wIndex);
1310 return 0;
1311 } else if (feature_is_dev_remote_wakeup(crq)) {
1312 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1313 } else {
1314 goto stall;
1315 }
1316 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1317 struct usba_ep *target;
1318
1319 if (crq->wLength != cpu_to_le16(0)
1320 || !feature_is_ep_halt(crq))
1321 goto stall;
1322
1323 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1324 if (!target)
1325 goto stall;
1326
1327 usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1328 } else
1329 goto delegate;
1330
1331 send_status(udc, ep);
1332 break;
1333 }
1334
1335 case USB_REQ_SET_ADDRESS:
1336 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1337 goto delegate;
1338
1339 set_address(udc, le16_to_cpu(crq->wValue));
1340 send_status(udc, ep);
1341 ep->state = STATUS_STAGE_ADDR;
1342 break;
1343
1344 default:
1345 delegate:
1346 spin_unlock(&udc->lock);
1347 retval = udc->driver->setup(&udc->gadget, crq);
1348 spin_lock(&udc->lock);
1349 }
1350
1351 return retval;
1352
1353 stall:
1354 pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1355 "halting endpoint...\n",
1356 ep->ep.name, crq->bRequestType, crq->bRequest,
1357 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1358 le16_to_cpu(crq->wLength));
1359 set_protocol_stall(udc, ep);
1360 return -1;
1361 }
1362
usba_control_irq(struct usba_udc * udc,struct usba_ep * ep)1363 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1364 {
1365 struct usba_request *req;
1366 u32 epstatus;
1367 u32 epctrl;
1368
1369 restart:
1370 epstatus = usba_ep_readl(ep, STA);
1371 epctrl = usba_ep_readl(ep, CTL);
1372
1373 DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1374 ep->ep.name, ep->state, epstatus, epctrl);
1375
1376 req = NULL;
1377 if (!list_empty(&ep->queue))
1378 req = list_entry(ep->queue.next,
1379 struct usba_request, queue);
1380
1381 if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1382 if (req->submitted)
1383 next_fifo_transaction(ep, req);
1384 else
1385 submit_request(ep, req);
1386
1387 if (req->last_transaction) {
1388 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1389 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1390 }
1391 goto restart;
1392 }
1393 if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1394 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1395
1396 switch (ep->state) {
1397 case DATA_STAGE_IN:
1398 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1399 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1400 ep->state = STATUS_STAGE_OUT;
1401 break;
1402 case STATUS_STAGE_ADDR:
1403 /* Activate our new address */
1404 usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1405 | USBA_FADDR_EN));
1406 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1407 ep->state = WAIT_FOR_SETUP;
1408 break;
1409 case STATUS_STAGE_IN:
1410 if (req) {
1411 list_del_init(&req->queue);
1412 request_complete(ep, req, 0);
1413 submit_next_request(ep);
1414 }
1415 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1416 ep->state = WAIT_FOR_SETUP;
1417 break;
1418 case STATUS_STAGE_TEST:
1419 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1420 ep->state = WAIT_FOR_SETUP;
1421 if (do_test_mode(udc))
1422 set_protocol_stall(udc, ep);
1423 break;
1424 default:
1425 pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1426 "halting endpoint...\n",
1427 ep->ep.name, ep->state);
1428 set_protocol_stall(udc, ep);
1429 break;
1430 }
1431
1432 goto restart;
1433 }
1434 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1435 switch (ep->state) {
1436 case STATUS_STAGE_OUT:
1437 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1438 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1439
1440 if (req) {
1441 list_del_init(&req->queue);
1442 request_complete(ep, req, 0);
1443 }
1444 ep->state = WAIT_FOR_SETUP;
1445 break;
1446
1447 case DATA_STAGE_OUT:
1448 receive_data(ep);
1449 break;
1450
1451 default:
1452 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1453 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1454 pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1455 "halting endpoint...\n",
1456 ep->ep.name, ep->state);
1457 set_protocol_stall(udc, ep);
1458 break;
1459 }
1460
1461 goto restart;
1462 }
1463 if (epstatus & USBA_RX_SETUP) {
1464 union {
1465 struct usb_ctrlrequest crq;
1466 unsigned long data[2];
1467 } crq;
1468 unsigned int pkt_len;
1469 int ret;
1470
1471 if (ep->state != WAIT_FOR_SETUP) {
1472 /*
1473 * Didn't expect a SETUP packet at this
1474 * point. Clean up any pending requests (which
1475 * may be successful).
1476 */
1477 int status = -EPROTO;
1478
1479 /*
1480 * RXRDY and TXCOMP are dropped when SETUP
1481 * packets arrive. Just pretend we received
1482 * the status packet.
1483 */
1484 if (ep->state == STATUS_STAGE_OUT
1485 || ep->state == STATUS_STAGE_IN) {
1486 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1487 status = 0;
1488 }
1489
1490 if (req) {
1491 list_del_init(&req->queue);
1492 request_complete(ep, req, status);
1493 }
1494 }
1495
1496 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1497 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1498 if (pkt_len != sizeof(crq)) {
1499 pr_warning("udc: Invalid packet length %u "
1500 "(expected %zu)\n", pkt_len, sizeof(crq));
1501 set_protocol_stall(udc, ep);
1502 return;
1503 }
1504
1505 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1506 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1507
1508 /* Free up one bank in the FIFO so that we can
1509 * generate or receive a reply right away. */
1510 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1511
1512 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1513 ep->state, crq.crq.bRequestType,
1514 crq.crq.bRequest); */
1515
1516 if (crq.crq.bRequestType & USB_DIR_IN) {
1517 /*
1518 * The USB 2.0 spec states that "if wLength is
1519 * zero, there is no data transfer phase."
1520 * However, testusb #14 seems to actually
1521 * expect a data phase even if wLength = 0...
1522 */
1523 ep->state = DATA_STAGE_IN;
1524 } else {
1525 if (crq.crq.wLength != cpu_to_le16(0))
1526 ep->state = DATA_STAGE_OUT;
1527 else
1528 ep->state = STATUS_STAGE_IN;
1529 }
1530
1531 ret = -1;
1532 if (ep->index == 0)
1533 ret = handle_ep0_setup(udc, ep, &crq.crq);
1534 else {
1535 spin_unlock(&udc->lock);
1536 ret = udc->driver->setup(&udc->gadget, &crq.crq);
1537 spin_lock(&udc->lock);
1538 }
1539
1540 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1541 crq.crq.bRequestType, crq.crq.bRequest,
1542 le16_to_cpu(crq.crq.wLength), ep->state, ret);
1543
1544 if (ret < 0) {
1545 /* Let the host know that we failed */
1546 set_protocol_stall(udc, ep);
1547 }
1548 }
1549 }
1550
usba_ep_irq(struct usba_udc * udc,struct usba_ep * ep)1551 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1552 {
1553 struct usba_request *req;
1554 u32 epstatus;
1555 u32 epctrl;
1556
1557 epstatus = usba_ep_readl(ep, STA);
1558 epctrl = usba_ep_readl(ep, CTL);
1559
1560 DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1561
1562 while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1563 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1564
1565 if (list_empty(&ep->queue)) {
1566 dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1567 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1568 return;
1569 }
1570
1571 req = list_entry(ep->queue.next, struct usba_request, queue);
1572
1573 if (req->using_dma) {
1574 /* Send a zero-length packet */
1575 usba_ep_writel(ep, SET_STA,
1576 USBA_TX_PK_RDY);
1577 usba_ep_writel(ep, CTL_DIS,
1578 USBA_TX_PK_RDY);
1579 list_del_init(&req->queue);
1580 submit_next_request(ep);
1581 request_complete(ep, req, 0);
1582 } else {
1583 if (req->submitted)
1584 next_fifo_transaction(ep, req);
1585 else
1586 submit_request(ep, req);
1587
1588 if (req->last_transaction) {
1589 list_del_init(&req->queue);
1590 submit_next_request(ep);
1591 request_complete(ep, req, 0);
1592 }
1593 }
1594
1595 epstatus = usba_ep_readl(ep, STA);
1596 epctrl = usba_ep_readl(ep, CTL);
1597 }
1598 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1599 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1600 receive_data(ep);
1601 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1602 }
1603 }
1604
usba_dma_irq(struct usba_udc * udc,struct usba_ep * ep)1605 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1606 {
1607 struct usba_request *req;
1608 u32 status, control, pending;
1609
1610 status = usba_dma_readl(ep, STATUS);
1611 control = usba_dma_readl(ep, CONTROL);
1612 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1613 ep->last_dma_status = status;
1614 #endif
1615 pending = status & control;
1616 DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1617
1618 if (status & USBA_DMA_CH_EN) {
1619 dev_err(&udc->pdev->dev,
1620 "DMA_CH_EN is set after transfer is finished!\n");
1621 dev_err(&udc->pdev->dev,
1622 "status=%#08x, pending=%#08x, control=%#08x\n",
1623 status, pending, control);
1624
1625 /*
1626 * try to pretend nothing happened. We might have to
1627 * do something here...
1628 */
1629 }
1630
1631 if (list_empty(&ep->queue))
1632 /* Might happen if a reset comes along at the right moment */
1633 return;
1634
1635 if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1636 req = list_entry(ep->queue.next, struct usba_request, queue);
1637 usba_update_req(ep, req, status);
1638
1639 list_del_init(&req->queue);
1640 submit_next_request(ep);
1641 request_complete(ep, req, 0);
1642 }
1643 }
1644
usba_udc_irq(int irq,void * devid)1645 static irqreturn_t usba_udc_irq(int irq, void *devid)
1646 {
1647 struct usba_udc *udc = devid;
1648 u32 status;
1649 u32 dma_status;
1650 u32 ep_status;
1651
1652 spin_lock(&udc->lock);
1653
1654 status = usba_readl(udc, INT_STA);
1655 DBG(DBG_INT, "irq, status=%#08x\n", status);
1656
1657 if (status & USBA_DET_SUSPEND) {
1658 toggle_bias(0);
1659 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1660 DBG(DBG_BUS, "Suspend detected\n");
1661 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1662 && udc->driver && udc->driver->suspend) {
1663 spin_unlock(&udc->lock);
1664 udc->driver->suspend(&udc->gadget);
1665 spin_lock(&udc->lock);
1666 }
1667 }
1668
1669 if (status & USBA_WAKE_UP) {
1670 toggle_bias(1);
1671 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1672 DBG(DBG_BUS, "Wake Up CPU detected\n");
1673 }
1674
1675 if (status & USBA_END_OF_RESUME) {
1676 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1677 DBG(DBG_BUS, "Resume detected\n");
1678 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1679 && udc->driver && udc->driver->resume) {
1680 spin_unlock(&udc->lock);
1681 udc->driver->resume(&udc->gadget);
1682 spin_lock(&udc->lock);
1683 }
1684 }
1685
1686 dma_status = USBA_BFEXT(DMA_INT, status);
1687 if (dma_status) {
1688 int i;
1689
1690 for (i = 1; i < USBA_NR_ENDPOINTS; i++)
1691 if (dma_status & (1 << i))
1692 usba_dma_irq(udc, &usba_ep[i]);
1693 }
1694
1695 ep_status = USBA_BFEXT(EPT_INT, status);
1696 if (ep_status) {
1697 int i;
1698
1699 for (i = 0; i < USBA_NR_ENDPOINTS; i++)
1700 if (ep_status & (1 << i)) {
1701 if (ep_is_control(&usba_ep[i]))
1702 usba_control_irq(udc, &usba_ep[i]);
1703 else
1704 usba_ep_irq(udc, &usba_ep[i]);
1705 }
1706 }
1707
1708 if (status & USBA_END_OF_RESET) {
1709 struct usba_ep *ep0;
1710
1711 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1712 reset_all_endpoints(udc);
1713
1714 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1715 && udc->driver->disconnect) {
1716 udc->gadget.speed = USB_SPEED_UNKNOWN;
1717 spin_unlock(&udc->lock);
1718 udc->driver->disconnect(&udc->gadget);
1719 spin_lock(&udc->lock);
1720 }
1721
1722 if (status & USBA_HIGH_SPEED)
1723 udc->gadget.speed = USB_SPEED_HIGH;
1724 else
1725 udc->gadget.speed = USB_SPEED_FULL;
1726 DBG(DBG_BUS, "%s bus reset detected\n",
1727 usb_speed_string(udc->gadget.speed));
1728
1729 ep0 = &usba_ep[0];
1730 ep0->desc = &usba_ep0_desc;
1731 ep0->state = WAIT_FOR_SETUP;
1732 usba_ep_writel(ep0, CFG,
1733 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1734 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1735 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1736 usba_ep_writel(ep0, CTL_ENB,
1737 USBA_EPT_ENABLE | USBA_RX_SETUP);
1738 usba_writel(udc, INT_ENB,
1739 (usba_readl(udc, INT_ENB)
1740 | USBA_BF(EPT_INT, 1)
1741 | USBA_DET_SUSPEND
1742 | USBA_END_OF_RESUME));
1743
1744 /*
1745 * Unclear why we hit this irregularly, e.g. in usbtest,
1746 * but it's clearly harmless...
1747 */
1748 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1749 dev_dbg(&udc->pdev->dev,
1750 "ODD: EP0 configuration is invalid!\n");
1751 }
1752
1753 spin_unlock(&udc->lock);
1754
1755 return IRQ_HANDLED;
1756 }
1757
usba_vbus_irq(int irq,void * devid)1758 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1759 {
1760 struct usba_udc *udc = devid;
1761 int vbus;
1762
1763 /* debounce */
1764 udelay(10);
1765
1766 spin_lock(&udc->lock);
1767
1768 /* May happen if Vbus pin toggles during probe() */
1769 if (!udc->driver)
1770 goto out;
1771
1772 vbus = vbus_is_present(udc);
1773 if (vbus != udc->vbus_prev) {
1774 if (vbus) {
1775 toggle_bias(1);
1776 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1777 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1778 } else {
1779 udc->gadget.speed = USB_SPEED_UNKNOWN;
1780 reset_all_endpoints(udc);
1781 toggle_bias(0);
1782 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1783 if (udc->driver->disconnect) {
1784 spin_unlock(&udc->lock);
1785 udc->driver->disconnect(&udc->gadget);
1786 spin_lock(&udc->lock);
1787 }
1788 }
1789 udc->vbus_prev = vbus;
1790 }
1791
1792 out:
1793 spin_unlock(&udc->lock);
1794
1795 return IRQ_HANDLED;
1796 }
1797
atmel_usba_start(struct usb_gadget_driver * driver,int (* bind)(struct usb_gadget *))1798 static int atmel_usba_start(struct usb_gadget_driver *driver,
1799 int (*bind)(struct usb_gadget *))
1800 {
1801 struct usba_udc *udc = &the_udc;
1802 unsigned long flags;
1803 int ret;
1804
1805 if (!udc->pdev)
1806 return -ENODEV;
1807
1808 spin_lock_irqsave(&udc->lock, flags);
1809 if (udc->driver) {
1810 spin_unlock_irqrestore(&udc->lock, flags);
1811 return -EBUSY;
1812 }
1813
1814 udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1815 udc->driver = driver;
1816 udc->gadget.dev.driver = &driver->driver;
1817 spin_unlock_irqrestore(&udc->lock, flags);
1818
1819 clk_enable(udc->pclk);
1820 clk_enable(udc->hclk);
1821
1822 ret = bind(&udc->gadget);
1823 if (ret) {
1824 DBG(DBG_ERR, "Could not bind to driver %s: error %d\n",
1825 driver->driver.name, ret);
1826 goto err_driver_bind;
1827 }
1828
1829 DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1830
1831 udc->vbus_prev = 0;
1832 if (gpio_is_valid(udc->vbus_pin))
1833 enable_irq(gpio_to_irq(udc->vbus_pin));
1834
1835 /* If Vbus is present, enable the controller and wait for reset */
1836 spin_lock_irqsave(&udc->lock, flags);
1837 if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1838 toggle_bias(1);
1839 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1840 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1841 }
1842 spin_unlock_irqrestore(&udc->lock, flags);
1843
1844 return 0;
1845
1846 err_driver_bind:
1847 udc->driver = NULL;
1848 udc->gadget.dev.driver = NULL;
1849 return ret;
1850 }
1851
atmel_usba_stop(struct usb_gadget_driver * driver)1852 static int atmel_usba_stop(struct usb_gadget_driver *driver)
1853 {
1854 struct usba_udc *udc = &the_udc;
1855 unsigned long flags;
1856
1857 if (!udc->pdev)
1858 return -ENODEV;
1859 if (driver != udc->driver || !driver->unbind)
1860 return -EINVAL;
1861
1862 if (gpio_is_valid(udc->vbus_pin))
1863 disable_irq(gpio_to_irq(udc->vbus_pin));
1864
1865 spin_lock_irqsave(&udc->lock, flags);
1866 udc->gadget.speed = USB_SPEED_UNKNOWN;
1867 reset_all_endpoints(udc);
1868 spin_unlock_irqrestore(&udc->lock, flags);
1869
1870 /* This will also disable the DP pullup */
1871 toggle_bias(0);
1872 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1873
1874 if (udc->driver->disconnect)
1875 udc->driver->disconnect(&udc->gadget);
1876
1877 driver->unbind(&udc->gadget);
1878 udc->gadget.dev.driver = NULL;
1879 udc->driver = NULL;
1880
1881 clk_disable(udc->hclk);
1882 clk_disable(udc->pclk);
1883
1884 DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
1885
1886 return 0;
1887 }
1888
usba_udc_probe(struct platform_device * pdev)1889 static int __init usba_udc_probe(struct platform_device *pdev)
1890 {
1891 struct usba_platform_data *pdata = pdev->dev.platform_data;
1892 struct resource *regs, *fifo;
1893 struct clk *pclk, *hclk;
1894 struct usba_udc *udc = &the_udc;
1895 int irq, ret, i;
1896
1897 regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1898 fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1899 if (!regs || !fifo || !pdata)
1900 return -ENXIO;
1901
1902 irq = platform_get_irq(pdev, 0);
1903 if (irq < 0)
1904 return irq;
1905
1906 pclk = clk_get(&pdev->dev, "pclk");
1907 if (IS_ERR(pclk))
1908 return PTR_ERR(pclk);
1909 hclk = clk_get(&pdev->dev, "hclk");
1910 if (IS_ERR(hclk)) {
1911 ret = PTR_ERR(hclk);
1912 goto err_get_hclk;
1913 }
1914
1915 spin_lock_init(&udc->lock);
1916 udc->pdev = pdev;
1917 udc->pclk = pclk;
1918 udc->hclk = hclk;
1919 udc->vbus_pin = -ENODEV;
1920
1921 ret = -ENOMEM;
1922 udc->regs = ioremap(regs->start, resource_size(regs));
1923 if (!udc->regs) {
1924 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
1925 goto err_map_regs;
1926 }
1927 dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
1928 (unsigned long)regs->start, udc->regs);
1929 udc->fifo = ioremap(fifo->start, resource_size(fifo));
1930 if (!udc->fifo) {
1931 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
1932 goto err_map_fifo;
1933 }
1934 dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
1935 (unsigned long)fifo->start, udc->fifo);
1936
1937 device_initialize(&udc->gadget.dev);
1938 udc->gadget.dev.parent = &pdev->dev;
1939 udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
1940
1941 platform_set_drvdata(pdev, udc);
1942
1943 /* Make sure we start from a clean slate */
1944 clk_enable(pclk);
1945 toggle_bias(0);
1946 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1947 clk_disable(pclk);
1948
1949 usba_ep = kzalloc(sizeof(struct usba_ep) * pdata->num_ep,
1950 GFP_KERNEL);
1951 if (!usba_ep)
1952 goto err_alloc_ep;
1953
1954 the_udc.gadget.ep0 = &usba_ep[0].ep;
1955
1956 INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
1957 usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
1958 usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
1959 usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
1960 usba_ep[0].ep.ops = &usba_ep_ops;
1961 usba_ep[0].ep.name = pdata->ep[0].name;
1962 usba_ep[0].ep.maxpacket = pdata->ep[0].fifo_size;
1963 usba_ep[0].udc = &the_udc;
1964 INIT_LIST_HEAD(&usba_ep[0].queue);
1965 usba_ep[0].fifo_size = pdata->ep[0].fifo_size;
1966 usba_ep[0].nr_banks = pdata->ep[0].nr_banks;
1967 usba_ep[0].index = pdata->ep[0].index;
1968 usba_ep[0].can_dma = pdata->ep[0].can_dma;
1969 usba_ep[0].can_isoc = pdata->ep[0].can_isoc;
1970
1971 for (i = 1; i < pdata->num_ep; i++) {
1972 struct usba_ep *ep = &usba_ep[i];
1973
1974 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1975 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1976 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1977 ep->ep.ops = &usba_ep_ops;
1978 ep->ep.name = pdata->ep[i].name;
1979 ep->ep.maxpacket = pdata->ep[i].fifo_size;
1980 ep->udc = &the_udc;
1981 INIT_LIST_HEAD(&ep->queue);
1982 ep->fifo_size = pdata->ep[i].fifo_size;
1983 ep->nr_banks = pdata->ep[i].nr_banks;
1984 ep->index = pdata->ep[i].index;
1985 ep->can_dma = pdata->ep[i].can_dma;
1986 ep->can_isoc = pdata->ep[i].can_isoc;
1987
1988 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1989 }
1990
1991 ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
1992 if (ret) {
1993 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
1994 irq, ret);
1995 goto err_request_irq;
1996 }
1997 udc->irq = irq;
1998
1999 ret = device_add(&udc->gadget.dev);
2000 if (ret) {
2001 dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
2002 goto err_device_add;
2003 }
2004
2005 if (gpio_is_valid(pdata->vbus_pin)) {
2006 if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
2007 udc->vbus_pin = pdata->vbus_pin;
2008 udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
2009
2010 ret = request_irq(gpio_to_irq(udc->vbus_pin),
2011 usba_vbus_irq, 0,
2012 "atmel_usba_udc", udc);
2013 if (ret) {
2014 gpio_free(udc->vbus_pin);
2015 udc->vbus_pin = -ENODEV;
2016 dev_warn(&udc->pdev->dev,
2017 "failed to request vbus irq; "
2018 "assuming always on\n");
2019 } else {
2020 disable_irq(gpio_to_irq(udc->vbus_pin));
2021 }
2022 } else {
2023 /* gpio_request fail so use -EINVAL for gpio_is_valid */
2024 udc->vbus_pin = -EINVAL;
2025 }
2026 }
2027
2028 ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2029 if (ret)
2030 goto err_add_udc;
2031
2032 usba_init_debugfs(udc);
2033 for (i = 1; i < pdata->num_ep; i++)
2034 usba_ep_init_debugfs(udc, &usba_ep[i]);
2035
2036 return 0;
2037
2038 err_add_udc:
2039 if (gpio_is_valid(pdata->vbus_pin)) {
2040 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2041 gpio_free(udc->vbus_pin);
2042 }
2043
2044 device_unregister(&udc->gadget.dev);
2045
2046 err_device_add:
2047 free_irq(irq, udc);
2048 err_request_irq:
2049 kfree(usba_ep);
2050 err_alloc_ep:
2051 iounmap(udc->fifo);
2052 err_map_fifo:
2053 iounmap(udc->regs);
2054 err_map_regs:
2055 clk_put(hclk);
2056 err_get_hclk:
2057 clk_put(pclk);
2058
2059 platform_set_drvdata(pdev, NULL);
2060
2061 return ret;
2062 }
2063
usba_udc_remove(struct platform_device * pdev)2064 static int __exit usba_udc_remove(struct platform_device *pdev)
2065 {
2066 struct usba_udc *udc;
2067 int i;
2068 struct usba_platform_data *pdata = pdev->dev.platform_data;
2069
2070 udc = platform_get_drvdata(pdev);
2071
2072 usb_del_gadget_udc(&udc->gadget);
2073
2074 for (i = 1; i < pdata->num_ep; i++)
2075 usba_ep_cleanup_debugfs(&usba_ep[i]);
2076 usba_cleanup_debugfs(udc);
2077
2078 if (gpio_is_valid(udc->vbus_pin)) {
2079 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2080 gpio_free(udc->vbus_pin);
2081 }
2082
2083 free_irq(udc->irq, udc);
2084 kfree(usba_ep);
2085 iounmap(udc->fifo);
2086 iounmap(udc->regs);
2087 clk_put(udc->hclk);
2088 clk_put(udc->pclk);
2089
2090 device_unregister(&udc->gadget.dev);
2091
2092 return 0;
2093 }
2094
2095 static struct platform_driver udc_driver = {
2096 .remove = __exit_p(usba_udc_remove),
2097 .driver = {
2098 .name = "atmel_usba_udc",
2099 .owner = THIS_MODULE,
2100 },
2101 };
2102
udc_init(void)2103 static int __init udc_init(void)
2104 {
2105 return platform_driver_probe(&udc_driver, usba_udc_probe);
2106 }
2107 module_init(udc_init);
2108
udc_exit(void)2109 static void __exit udc_exit(void)
2110 {
2111 platform_driver_unregister(&udc_driver);
2112 }
2113 module_exit(udc_exit);
2114
2115 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2116 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2117 MODULE_LICENSE("GPL");
2118 MODULE_ALIAS("platform:atmel_usba_udc");
2119