Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/usb/gadget/atmel_usba_udc.c

  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 <linux/clk/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 static 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_DMAS; 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 < udc->num_ep; 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         clk_disable_unprepare(udc->hclk);
1831         clk_disable_unprepare(udc->pclk);
1832 
1833         DBG(DBG_GADGET, "unregistered driver `%s'\n", udc->driver->driver.name);
1834 
1835         udc->driver = NULL;
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                 usb_ep_set_maxpacket_limit(&ep->ep, 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         if (i == 0) {
1918                 dev_err(&pdev->dev, "of_probe: no endpoint specified\n");
1919                 ret = -EINVAL;
1920                 goto err;
1921         }
1922 
1923         return eps;
1924 err:
1925         return ERR_PTR(ret);
1926 }
1927 #else
1928 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1929                                                     struct usba_udc *udc)
1930 {
1931         return ERR_PTR(-ENOSYS);
1932 }
1933 #endif
1934 
1935 static struct usba_ep * usba_udc_pdata(struct platform_device *pdev,
1936                                                  struct usba_udc *udc)
1937 {
1938         struct usba_platform_data *pdata = dev_get_platdata(&pdev->dev);
1939         struct usba_ep *eps;
1940         int i;
1941 
1942         if (!pdata)
1943                 return ERR_PTR(-ENXIO);
1944 
1945         eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * pdata->num_ep,
1946                            GFP_KERNEL);
1947         if (!eps)
1948                 return ERR_PTR(-ENOMEM);
1949 
1950         udc->gadget.ep0 = &eps[0].ep;
1951 
1952         udc->vbus_pin = pdata->vbus_pin;
1953         udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
1954         udc->num_ep = pdata->num_ep;
1955 
1956         INIT_LIST_HEAD(&eps[0].ep.ep_list);
1957 
1958         for (i = 0; i < pdata->num_ep; i++) {
1959                 struct usba_ep *ep = &eps[i];
1960 
1961                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1962                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1963                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1964                 ep->ep.ops = &usba_ep_ops;
1965                 ep->ep.name = pdata->ep[i].name;
1966                 ep->fifo_size = pdata->ep[i].fifo_size;
1967                 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
1968                 ep->udc = udc;
1969                 INIT_LIST_HEAD(&ep->queue);
1970                 ep->nr_banks = pdata->ep[i].nr_banks;
1971                 ep->index = pdata->ep[i].index;
1972                 ep->can_dma = pdata->ep[i].can_dma;
1973                 ep->can_isoc = pdata->ep[i].can_isoc;
1974 
1975                 if (i)
1976                         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1977         }
1978 
1979         return eps;
1980 }
1981 
1982 static int __init usba_udc_probe(struct platform_device *pdev)
1983 {
1984         struct resource *regs, *fifo;
1985         struct clk *pclk, *hclk;
1986         struct usba_udc *udc;
1987         int irq, ret, i;
1988 
1989         udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
1990         if (!udc)
1991                 return -ENOMEM;
1992 
1993         udc->gadget = usba_gadget_template;
1994         INIT_LIST_HEAD(&udc->gadget.ep_list);
1995 
1996         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1997         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1998         if (!regs || !fifo)
1999                 return -ENXIO;
2000 
2001         irq = platform_get_irq(pdev, 0);
2002         if (irq < 0)
2003                 return irq;
2004 
2005         pclk = devm_clk_get(&pdev->dev, "pclk");
2006         if (IS_ERR(pclk))
2007                 return PTR_ERR(pclk);
2008         hclk = devm_clk_get(&pdev->dev, "hclk");
2009         if (IS_ERR(hclk))
2010                 return PTR_ERR(hclk);
2011 
2012         spin_lock_init(&udc->lock);
2013         udc->pdev = pdev;
2014         udc->pclk = pclk;
2015         udc->hclk = hclk;
2016         udc->vbus_pin = -ENODEV;
2017 
2018         ret = -ENOMEM;
2019         udc->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2020         if (!udc->regs) {
2021                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
2022                 return ret;
2023         }
2024         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
2025                  (unsigned long)regs->start, udc->regs);
2026         udc->fifo = devm_ioremap(&pdev->dev, fifo->start, resource_size(fifo));
2027         if (!udc->fifo) {
2028                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
2029                 return ret;
2030         }
2031         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
2032                  (unsigned long)fifo->start, udc->fifo);
2033 
2034         platform_set_drvdata(pdev, udc);
2035 
2036         /* Make sure we start from a clean slate */
2037         ret = clk_prepare_enable(pclk);
2038         if (ret) {
2039                 dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
2040                 return ret;
2041         }
2042         toggle_bias(0);
2043         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
2044         clk_disable_unprepare(pclk);
2045 
2046         if (pdev->dev.of_node)
2047                 udc->usba_ep = atmel_udc_of_init(pdev, udc);
2048         else
2049                 udc->usba_ep = usba_udc_pdata(pdev, udc);
2050 
2051         if (IS_ERR(udc->usba_ep))
2052                 return PTR_ERR(udc->usba_ep);
2053 
2054         ret = devm_request_irq(&pdev->dev, irq, usba_udc_irq, 0,
2055                                 "atmel_usba_udc", udc);
2056         if (ret) {
2057                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
2058                         irq, ret);
2059                 return ret;
2060         }
2061         udc->irq = irq;
2062 
2063         if (gpio_is_valid(udc->vbus_pin)) {
2064                 if (!devm_gpio_request(&pdev->dev, udc->vbus_pin, "atmel_usba_udc")) {
2065                         ret = devm_request_irq(&pdev->dev,
2066                                         gpio_to_irq(udc->vbus_pin),
2067                                         usba_vbus_irq, 0,
2068                                         "atmel_usba_udc", udc);
2069                         if (ret) {
2070                                 udc->vbus_pin = -ENODEV;
2071                                 dev_warn(&udc->pdev->dev,
2072                                          "failed to request vbus irq; "
2073                                          "assuming always on\n");
2074                         } else {
2075                                 disable_irq(gpio_to_irq(udc->vbus_pin));
2076                         }
2077                 } else {
2078                         /* gpio_request fail so use -EINVAL for gpio_is_valid */
2079                         udc->vbus_pin = -EINVAL;
2080                 }
2081         }
2082 
2083         ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2084         if (ret)
2085                 return ret;
2086 
2087         usba_init_debugfs(udc);
2088         for (i = 1; i < udc->num_ep; i++)
2089                 usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
2090 
2091         return 0;
2092 }
2093 
2094 static int __exit usba_udc_remove(struct platform_device *pdev)
2095 {
2096         struct usba_udc *udc;
2097         int i;
2098 
2099         udc = platform_get_drvdata(pdev);
2100 
2101         usb_del_gadget_udc(&udc->gadget);
2102 
2103         for (i = 1; i < udc->num_ep; i++)
2104                 usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
2105         usba_cleanup_debugfs(udc);
2106 
2107         return 0;
2108 }
2109 
2110 #if defined(CONFIG_OF)
2111 static const struct of_device_id atmel_udc_dt_ids[] = {
2112         { .compatible = "atmel,at91sam9rl-udc" },
2113         { /* sentinel */ }
2114 };
2115 
2116 MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
2117 #endif
2118 
2119 static struct platform_driver udc_driver = {
2120         .remove         = __exit_p(usba_udc_remove),
2121         .driver         = {
2122                 .name           = "atmel_usba_udc",
2123                 .owner          = THIS_MODULE,
2124                 .of_match_table = of_match_ptr(atmel_udc_dt_ids),
2125         },
2126 };
2127 
2128 module_platform_driver_probe(udc_driver, usba_udc_probe);
2129 
2130 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2131 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2132 MODULE_LICENSE("GPL");
2133 MODULE_ALIAS("platform:atmel_usba_udc");
2134 

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