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[thirdparty/linux.git] / drivers / usb / gadget / udc / atmel_usba_udc.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Driver for the Atmel USBA high speed USB device controller
4 *
5 * Copyright (C) 2005-2007 Atmel Corporation
6 */
7 #include <linux/clk.h>
8 #include <linux/clk/at91_pmc.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/interrupt.h>
12 #include <linux/io.h>
13 #include <linux/slab.h>
14 #include <linux/device.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/list.h>
17 #include <linux/mfd/syscon.h>
18 #include <linux/platform_device.h>
19 #include <linux/regmap.h>
20 #include <linux/ctype.h>
21 #include <linux/usb.h>
22 #include <linux/usb/ch9.h>
23 #include <linux/usb/gadget.h>
24 #include <linux/delay.h>
25 #include <linux/of.h>
26 #include <linux/irq.h>
27 #include <linux/gpio/consumer.h>
28
29 #include "atmel_usba_udc.h"
30 #define USBA_VBUS_IRQFLAGS (IRQF_ONESHOT \
31 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING)
32
33 #ifdef CONFIG_USB_GADGET_DEBUG_FS
34 #include <linux/debugfs.h>
35 #include <linux/uaccess.h>
36
37 static int queue_dbg_open(struct inode *inode, struct file *file)
38 {
39 struct usba_ep *ep = inode->i_private;
40 struct usba_request *req, *req_copy;
41 struct list_head *queue_data;
42
43 queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
44 if (!queue_data)
45 return -ENOMEM;
46 INIT_LIST_HEAD(queue_data);
47
48 spin_lock_irq(&ep->udc->lock);
49 list_for_each_entry(req, &ep->queue, queue) {
50 req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
51 if (!req_copy)
52 goto fail;
53 list_add_tail(&req_copy->queue, queue_data);
54 }
55 spin_unlock_irq(&ep->udc->lock);
56
57 file->private_data = queue_data;
58 return 0;
59
60 fail:
61 spin_unlock_irq(&ep->udc->lock);
62 list_for_each_entry_safe(req, req_copy, queue_data, queue) {
63 list_del(&req->queue);
64 kfree(req);
65 }
66 kfree(queue_data);
67 return -ENOMEM;
68 }
69
70 /*
71 * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
72 *
73 * b: buffer address
74 * l: buffer length
75 * I/i: interrupt/no interrupt
76 * Z/z: zero/no zero
77 * S/s: short ok/short not ok
78 * s: status
79 * n: nr_packets
80 * F/f: submitted/not submitted to FIFO
81 * D/d: using/not using DMA
82 * L/l: last transaction/not last transaction
83 */
84 static ssize_t queue_dbg_read(struct file *file, char __user *buf,
85 size_t nbytes, loff_t *ppos)
86 {
87 struct list_head *queue = file->private_data;
88 struct usba_request *req, *tmp_req;
89 size_t len, remaining, actual = 0;
90 char tmpbuf[38];
91
92 if (!access_ok(buf, nbytes))
93 return -EFAULT;
94
95 inode_lock(file_inode(file));
96 list_for_each_entry_safe(req, tmp_req, queue, queue) {
97 len = snprintf(tmpbuf, sizeof(tmpbuf),
98 "%8p %08x %c%c%c %5d %c%c%c\n",
99 req->req.buf, req->req.length,
100 req->req.no_interrupt ? 'i' : 'I',
101 req->req.zero ? 'Z' : 'z',
102 req->req.short_not_ok ? 's' : 'S',
103 req->req.status,
104 req->submitted ? 'F' : 'f',
105 req->using_dma ? 'D' : 'd',
106 req->last_transaction ? 'L' : 'l');
107 len = min(len, sizeof(tmpbuf));
108 if (len > nbytes)
109 break;
110
111 list_del(&req->queue);
112 kfree(req);
113
114 remaining = __copy_to_user(buf, tmpbuf, len);
115 actual += len - remaining;
116 if (remaining)
117 break;
118
119 nbytes -= len;
120 buf += len;
121 }
122 inode_unlock(file_inode(file));
123
124 return actual;
125 }
126
127 static int queue_dbg_release(struct inode *inode, struct file *file)
128 {
129 struct list_head *queue_data = file->private_data;
130 struct usba_request *req, *tmp_req;
131
132 list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
133 list_del(&req->queue);
134 kfree(req);
135 }
136 kfree(queue_data);
137 return 0;
138 }
139
140 static int regs_dbg_open(struct inode *inode, struct file *file)
141 {
142 struct usba_udc *udc;
143 unsigned int i;
144 u32 *data;
145 int ret = -ENOMEM;
146
147 inode_lock(inode);
148 udc = inode->i_private;
149 data = kmalloc(inode->i_size, GFP_KERNEL);
150 if (!data)
151 goto out;
152
153 spin_lock_irq(&udc->lock);
154 for (i = 0; i < inode->i_size / 4; i++)
155 data[i] = readl_relaxed(udc->regs + i * 4);
156 spin_unlock_irq(&udc->lock);
157
158 file->private_data = data;
159 ret = 0;
160
161 out:
162 inode_unlock(inode);
163
164 return ret;
165 }
166
167 static ssize_t regs_dbg_read(struct file *file, char __user *buf,
168 size_t nbytes, loff_t *ppos)
169 {
170 struct inode *inode = file_inode(file);
171 int ret;
172
173 inode_lock(inode);
174 ret = simple_read_from_buffer(buf, nbytes, ppos,
175 file->private_data,
176 file_inode(file)->i_size);
177 inode_unlock(inode);
178
179 return ret;
180 }
181
182 static int regs_dbg_release(struct inode *inode, struct file *file)
183 {
184 kfree(file->private_data);
185 return 0;
186 }
187
188 const struct file_operations queue_dbg_fops = {
189 .owner = THIS_MODULE,
190 .open = queue_dbg_open,
191 .llseek = no_llseek,
192 .read = queue_dbg_read,
193 .release = queue_dbg_release,
194 };
195
196 const struct file_operations regs_dbg_fops = {
197 .owner = THIS_MODULE,
198 .open = regs_dbg_open,
199 .llseek = generic_file_llseek,
200 .read = regs_dbg_read,
201 .release = regs_dbg_release,
202 };
203
204 static void usba_ep_init_debugfs(struct usba_udc *udc,
205 struct usba_ep *ep)
206 {
207 struct dentry *ep_root;
208
209 ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
210 ep->debugfs_dir = ep_root;
211
212 debugfs_create_file("queue", 0400, ep_root, ep, &queue_dbg_fops);
213 if (ep->can_dma)
214 debugfs_create_u32("dma_status", 0400, ep_root,
215 &ep->last_dma_status);
216 if (ep_is_control(ep))
217 debugfs_create_u32("state", 0400, ep_root, &ep->state);
218 }
219
220 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
221 {
222 debugfs_remove_recursive(ep->debugfs_dir);
223 }
224
225 static void usba_init_debugfs(struct usba_udc *udc)
226 {
227 struct dentry *root;
228 struct resource *regs_resource;
229
230 root = debugfs_create_dir(udc->gadget.name, usb_debug_root);
231 udc->debugfs_root = root;
232
233 regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
234 CTRL_IOMEM_ID);
235
236 if (regs_resource) {
237 debugfs_create_file_size("regs", 0400, root, udc,
238 &regs_dbg_fops,
239 resource_size(regs_resource));
240 }
241
242 usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
243 }
244
245 static void usba_cleanup_debugfs(struct usba_udc *udc)
246 {
247 usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
248 debugfs_remove_recursive(udc->debugfs_root);
249 }
250 #else
251 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
252 struct usba_ep *ep)
253 {
254
255 }
256
257 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
258 {
259
260 }
261
262 static inline void usba_init_debugfs(struct usba_udc *udc)
263 {
264
265 }
266
267 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
268 {
269
270 }
271 #endif
272
273 static ushort fifo_mode;
274
275 module_param(fifo_mode, ushort, 0x0);
276 MODULE_PARM_DESC(fifo_mode, "Endpoint configuration mode");
277
278 /* mode 0 - uses autoconfig */
279
280 /* mode 1 - fits in 8KB, generic max fifo configuration */
281 static struct usba_fifo_cfg mode_1_cfg[] = {
282 { .hw_ep_num = 0, .fifo_size = 64, .nr_banks = 1, },
283 { .hw_ep_num = 1, .fifo_size = 1024, .nr_banks = 2, },
284 { .hw_ep_num = 2, .fifo_size = 1024, .nr_banks = 1, },
285 { .hw_ep_num = 3, .fifo_size = 1024, .nr_banks = 1, },
286 { .hw_ep_num = 4, .fifo_size = 1024, .nr_banks = 1, },
287 { .hw_ep_num = 5, .fifo_size = 1024, .nr_banks = 1, },
288 { .hw_ep_num = 6, .fifo_size = 1024, .nr_banks = 1, },
289 };
290
291 /* mode 2 - fits in 8KB, performance max fifo configuration */
292 static struct usba_fifo_cfg mode_2_cfg[] = {
293 { .hw_ep_num = 0, .fifo_size = 64, .nr_banks = 1, },
294 { .hw_ep_num = 1, .fifo_size = 1024, .nr_banks = 3, },
295 { .hw_ep_num = 2, .fifo_size = 1024, .nr_banks = 2, },
296 { .hw_ep_num = 3, .fifo_size = 1024, .nr_banks = 2, },
297 };
298
299 /* mode 3 - fits in 8KB, mixed fifo configuration */
300 static struct usba_fifo_cfg mode_3_cfg[] = {
301 { .hw_ep_num = 0, .fifo_size = 64, .nr_banks = 1, },
302 { .hw_ep_num = 1, .fifo_size = 1024, .nr_banks = 2, },
303 { .hw_ep_num = 2, .fifo_size = 512, .nr_banks = 2, },
304 { .hw_ep_num = 3, .fifo_size = 512, .nr_banks = 2, },
305 { .hw_ep_num = 4, .fifo_size = 512, .nr_banks = 2, },
306 { .hw_ep_num = 5, .fifo_size = 512, .nr_banks = 2, },
307 { .hw_ep_num = 6, .fifo_size = 512, .nr_banks = 2, },
308 };
309
310 /* mode 4 - fits in 8KB, custom fifo configuration */
311 static struct usba_fifo_cfg mode_4_cfg[] = {
312 { .hw_ep_num = 0, .fifo_size = 64, .nr_banks = 1, },
313 { .hw_ep_num = 1, .fifo_size = 512, .nr_banks = 2, },
314 { .hw_ep_num = 2, .fifo_size = 512, .nr_banks = 2, },
315 { .hw_ep_num = 3, .fifo_size = 8, .nr_banks = 2, },
316 { .hw_ep_num = 4, .fifo_size = 512, .nr_banks = 2, },
317 { .hw_ep_num = 5, .fifo_size = 512, .nr_banks = 2, },
318 { .hw_ep_num = 6, .fifo_size = 16, .nr_banks = 2, },
319 { .hw_ep_num = 7, .fifo_size = 8, .nr_banks = 2, },
320 { .hw_ep_num = 8, .fifo_size = 8, .nr_banks = 2, },
321 };
322 /* Add additional configurations here */
323
324 static int usba_config_fifo_table(struct usba_udc *udc)
325 {
326 int n;
327
328 switch (fifo_mode) {
329 default:
330 fifo_mode = 0;
331 /* fall through */
332 case 0:
333 udc->fifo_cfg = NULL;
334 n = 0;
335 break;
336 case 1:
337 udc->fifo_cfg = mode_1_cfg;
338 n = ARRAY_SIZE(mode_1_cfg);
339 break;
340 case 2:
341 udc->fifo_cfg = mode_2_cfg;
342 n = ARRAY_SIZE(mode_2_cfg);
343 break;
344 case 3:
345 udc->fifo_cfg = mode_3_cfg;
346 n = ARRAY_SIZE(mode_3_cfg);
347 break;
348 case 4:
349 udc->fifo_cfg = mode_4_cfg;
350 n = ARRAY_SIZE(mode_4_cfg);
351 break;
352 }
353 DBG(DBG_HW, "Setup fifo_mode %d\n", fifo_mode);
354
355 return n;
356 }
357
358 static inline u32 usba_int_enb_get(struct usba_udc *udc)
359 {
360 return udc->int_enb_cache;
361 }
362
363 static inline void usba_int_enb_set(struct usba_udc *udc, u32 mask)
364 {
365 u32 val;
366
367 val = udc->int_enb_cache | mask;
368 usba_writel(udc, INT_ENB, val);
369 udc->int_enb_cache = val;
370 }
371
372 static inline void usba_int_enb_clear(struct usba_udc *udc, u32 mask)
373 {
374 u32 val;
375
376 val = udc->int_enb_cache & ~mask;
377 usba_writel(udc, INT_ENB, val);
378 udc->int_enb_cache = val;
379 }
380
381 static int vbus_is_present(struct usba_udc *udc)
382 {
383 if (udc->vbus_pin)
384 return gpiod_get_value(udc->vbus_pin);
385
386 /* No Vbus detection: Assume always present */
387 return 1;
388 }
389
390 static void toggle_bias(struct usba_udc *udc, int is_on)
391 {
392 if (udc->errata && udc->errata->toggle_bias)
393 udc->errata->toggle_bias(udc, is_on);
394 }
395
396 static void generate_bias_pulse(struct usba_udc *udc)
397 {
398 if (!udc->bias_pulse_needed)
399 return;
400
401 if (udc->errata && udc->errata->pulse_bias)
402 udc->errata->pulse_bias(udc);
403
404 udc->bias_pulse_needed = false;
405 }
406
407 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
408 {
409 unsigned int transaction_len;
410
411 transaction_len = req->req.length - req->req.actual;
412 req->last_transaction = 1;
413 if (transaction_len > ep->ep.maxpacket) {
414 transaction_len = ep->ep.maxpacket;
415 req->last_transaction = 0;
416 } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
417 req->last_transaction = 0;
418
419 DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
420 ep->ep.name, req, transaction_len,
421 req->last_transaction ? ", done" : "");
422
423 memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
424 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
425 req->req.actual += transaction_len;
426 }
427
428 static void submit_request(struct usba_ep *ep, struct usba_request *req)
429 {
430 DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
431 ep->ep.name, req, req->req.length);
432
433 req->req.actual = 0;
434 req->submitted = 1;
435
436 if (req->using_dma) {
437 if (req->req.length == 0) {
438 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
439 return;
440 }
441
442 if (req->req.zero)
443 usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
444 else
445 usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
446
447 usba_dma_writel(ep, ADDRESS, req->req.dma);
448 usba_dma_writel(ep, CONTROL, req->ctrl);
449 } else {
450 next_fifo_transaction(ep, req);
451 if (req->last_transaction) {
452 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
453 if (ep_is_control(ep))
454 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
455 } else {
456 if (ep_is_control(ep))
457 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
458 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
459 }
460 }
461 }
462
463 static void submit_next_request(struct usba_ep *ep)
464 {
465 struct usba_request *req;
466
467 if (list_empty(&ep->queue)) {
468 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
469 return;
470 }
471
472 req = list_entry(ep->queue.next, struct usba_request, queue);
473 if (!req->submitted)
474 submit_request(ep, req);
475 }
476
477 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
478 {
479 ep->state = STATUS_STAGE_IN;
480 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
481 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
482 }
483
484 static void receive_data(struct usba_ep *ep)
485 {
486 struct usba_udc *udc = ep->udc;
487 struct usba_request *req;
488 unsigned long status;
489 unsigned int bytecount, nr_busy;
490 int is_complete = 0;
491
492 status = usba_ep_readl(ep, STA);
493 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
494
495 DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
496
497 while (nr_busy > 0) {
498 if (list_empty(&ep->queue)) {
499 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
500 break;
501 }
502 req = list_entry(ep->queue.next,
503 struct usba_request, queue);
504
505 bytecount = USBA_BFEXT(BYTE_COUNT, status);
506
507 if (status & (1 << 31))
508 is_complete = 1;
509 if (req->req.actual + bytecount >= req->req.length) {
510 is_complete = 1;
511 bytecount = req->req.length - req->req.actual;
512 }
513
514 memcpy_fromio(req->req.buf + req->req.actual,
515 ep->fifo, bytecount);
516 req->req.actual += bytecount;
517
518 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
519
520 if (is_complete) {
521 DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
522 req->req.status = 0;
523 list_del_init(&req->queue);
524 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
525 spin_unlock(&udc->lock);
526 usb_gadget_giveback_request(&ep->ep, &req->req);
527 spin_lock(&udc->lock);
528 }
529
530 status = usba_ep_readl(ep, STA);
531 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
532
533 if (is_complete && ep_is_control(ep)) {
534 send_status(udc, ep);
535 break;
536 }
537 }
538 }
539
540 static void
541 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
542 {
543 struct usba_udc *udc = ep->udc;
544
545 WARN_ON(!list_empty(&req->queue));
546
547 if (req->req.status == -EINPROGRESS)
548 req->req.status = status;
549
550 if (req->using_dma)
551 usb_gadget_unmap_request(&udc->gadget, &req->req, ep->is_in);
552
553 DBG(DBG_GADGET | DBG_REQ,
554 "%s: req %p complete: status %d, actual %u\n",
555 ep->ep.name, req, req->req.status, req->req.actual);
556
557 spin_unlock(&udc->lock);
558 usb_gadget_giveback_request(&ep->ep, &req->req);
559 spin_lock(&udc->lock);
560 }
561
562 static void
563 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
564 {
565 struct usba_request *req, *tmp_req;
566
567 list_for_each_entry_safe(req, tmp_req, list, queue) {
568 list_del_init(&req->queue);
569 request_complete(ep, req, status);
570 }
571 }
572
573 static int
574 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
575 {
576 struct usba_ep *ep = to_usba_ep(_ep);
577 struct usba_udc *udc = ep->udc;
578 unsigned long flags, maxpacket;
579 unsigned int nr_trans;
580
581 DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
582
583 maxpacket = usb_endpoint_maxp(desc);
584
585 if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
586 || ep->index == 0
587 || desc->bDescriptorType != USB_DT_ENDPOINT
588 || maxpacket == 0
589 || maxpacket > ep->fifo_size) {
590 DBG(DBG_ERR, "ep_enable: Invalid argument");
591 return -EINVAL;
592 }
593
594 ep->is_isoc = 0;
595 ep->is_in = 0;
596
597 DBG(DBG_ERR, "%s: EPT_CFG = 0x%lx (maxpacket = %lu)\n",
598 ep->ep.name, ep->ept_cfg, maxpacket);
599
600 if (usb_endpoint_dir_in(desc)) {
601 ep->is_in = 1;
602 ep->ept_cfg |= USBA_EPT_DIR_IN;
603 }
604
605 switch (usb_endpoint_type(desc)) {
606 case USB_ENDPOINT_XFER_CONTROL:
607 ep->ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
608 break;
609 case USB_ENDPOINT_XFER_ISOC:
610 if (!ep->can_isoc) {
611 DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
612 ep->ep.name);
613 return -EINVAL;
614 }
615
616 /*
617 * Bits 11:12 specify number of _additional_
618 * transactions per microframe.
619 */
620 nr_trans = usb_endpoint_maxp_mult(desc);
621 if (nr_trans > 3)
622 return -EINVAL;
623
624 ep->is_isoc = 1;
625 ep->ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
626 ep->ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
627
628 break;
629 case USB_ENDPOINT_XFER_BULK:
630 ep->ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
631 break;
632 case USB_ENDPOINT_XFER_INT:
633 ep->ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
634 break;
635 }
636
637 spin_lock_irqsave(&ep->udc->lock, flags);
638
639 ep->ep.desc = desc;
640 ep->ep.maxpacket = maxpacket;
641
642 usba_ep_writel(ep, CFG, ep->ept_cfg);
643 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
644
645 if (ep->can_dma) {
646 u32 ctrl;
647
648 usba_int_enb_set(udc, USBA_BF(EPT_INT, 1 << ep->index) |
649 USBA_BF(DMA_INT, 1 << ep->index));
650 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
651 usba_ep_writel(ep, CTL_ENB, ctrl);
652 } else {
653 usba_int_enb_set(udc, USBA_BF(EPT_INT, 1 << ep->index));
654 }
655
656 spin_unlock_irqrestore(&udc->lock, flags);
657
658 DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
659 (unsigned long)usba_ep_readl(ep, CFG));
660 DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
661 (unsigned long)usba_int_enb_get(udc));
662
663 return 0;
664 }
665
666 static int usba_ep_disable(struct usb_ep *_ep)
667 {
668 struct usba_ep *ep = to_usba_ep(_ep);
669 struct usba_udc *udc = ep->udc;
670 LIST_HEAD(req_list);
671 unsigned long flags;
672
673 DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
674
675 spin_lock_irqsave(&udc->lock, flags);
676
677 if (!ep->ep.desc) {
678 spin_unlock_irqrestore(&udc->lock, flags);
679 /* REVISIT because this driver disables endpoints in
680 * reset_all_endpoints() before calling disconnect(),
681 * most gadget drivers would trigger this non-error ...
682 */
683 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
684 DBG(DBG_ERR, "ep_disable: %s not enabled\n",
685 ep->ep.name);
686 return -EINVAL;
687 }
688 ep->ep.desc = NULL;
689
690 list_splice_init(&ep->queue, &req_list);
691 if (ep->can_dma) {
692 usba_dma_writel(ep, CONTROL, 0);
693 usba_dma_writel(ep, ADDRESS, 0);
694 usba_dma_readl(ep, STATUS);
695 }
696 usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
697 usba_int_enb_clear(udc, USBA_BF(EPT_INT, 1 << ep->index));
698
699 request_complete_list(ep, &req_list, -ESHUTDOWN);
700
701 spin_unlock_irqrestore(&udc->lock, flags);
702
703 return 0;
704 }
705
706 static struct usb_request *
707 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
708 {
709 struct usba_request *req;
710
711 DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
712
713 req = kzalloc(sizeof(*req), gfp_flags);
714 if (!req)
715 return NULL;
716
717 INIT_LIST_HEAD(&req->queue);
718
719 return &req->req;
720 }
721
722 static void
723 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
724 {
725 struct usba_request *req = to_usba_req(_req);
726
727 DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
728
729 kfree(req);
730 }
731
732 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
733 struct usba_request *req, gfp_t gfp_flags)
734 {
735 unsigned long flags;
736 int ret;
737
738 DBG(DBG_DMA, "%s: req l/%u d/%pad %c%c%c\n",
739 ep->ep.name, req->req.length, &req->req.dma,
740 req->req.zero ? 'Z' : 'z',
741 req->req.short_not_ok ? 'S' : 's',
742 req->req.no_interrupt ? 'I' : 'i');
743
744 if (req->req.length > 0x10000) {
745 /* Lengths from 0 to 65536 (inclusive) are supported */
746 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
747 return -EINVAL;
748 }
749
750 ret = usb_gadget_map_request(&udc->gadget, &req->req, ep->is_in);
751 if (ret)
752 return ret;
753
754 req->using_dma = 1;
755 req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
756 | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
757 | USBA_DMA_END_BUF_EN;
758
759 if (!ep->is_in)
760 req->ctrl |= USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
761
762 /*
763 * Add this request to the queue and submit for DMA if
764 * possible. Check if we're still alive first -- we may have
765 * received a reset since last time we checked.
766 */
767 ret = -ESHUTDOWN;
768 spin_lock_irqsave(&udc->lock, flags);
769 if (ep->ep.desc) {
770 if (list_empty(&ep->queue))
771 submit_request(ep, req);
772
773 list_add_tail(&req->queue, &ep->queue);
774 ret = 0;
775 }
776 spin_unlock_irqrestore(&udc->lock, flags);
777
778 return ret;
779 }
780
781 static int
782 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
783 {
784 struct usba_request *req = to_usba_req(_req);
785 struct usba_ep *ep = to_usba_ep(_ep);
786 struct usba_udc *udc = ep->udc;
787 unsigned long flags;
788 int ret;
789
790 DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
791 ep->ep.name, req, _req->length);
792
793 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
794 !ep->ep.desc)
795 return -ESHUTDOWN;
796
797 req->submitted = 0;
798 req->using_dma = 0;
799 req->last_transaction = 0;
800
801 _req->status = -EINPROGRESS;
802 _req->actual = 0;
803
804 if (ep->can_dma)
805 return queue_dma(udc, ep, req, gfp_flags);
806
807 /* May have received a reset since last time we checked */
808 ret = -ESHUTDOWN;
809 spin_lock_irqsave(&udc->lock, flags);
810 if (ep->ep.desc) {
811 list_add_tail(&req->queue, &ep->queue);
812
813 if ((!ep_is_control(ep) && ep->is_in) ||
814 (ep_is_control(ep)
815 && (ep->state == DATA_STAGE_IN
816 || ep->state == STATUS_STAGE_IN)))
817 usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
818 else
819 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
820 ret = 0;
821 }
822 spin_unlock_irqrestore(&udc->lock, flags);
823
824 return ret;
825 }
826
827 static void
828 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
829 {
830 req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
831 }
832
833 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
834 {
835 unsigned int timeout;
836 u32 status;
837
838 /*
839 * Stop the DMA controller. When writing both CH_EN
840 * and LINK to 0, the other bits are not affected.
841 */
842 usba_dma_writel(ep, CONTROL, 0);
843
844 /* Wait for the FIFO to empty */
845 for (timeout = 40; timeout; --timeout) {
846 status = usba_dma_readl(ep, STATUS);
847 if (!(status & USBA_DMA_CH_EN))
848 break;
849 udelay(1);
850 }
851
852 if (pstatus)
853 *pstatus = status;
854
855 if (timeout == 0) {
856 dev_err(&ep->udc->pdev->dev,
857 "%s: timed out waiting for DMA FIFO to empty\n",
858 ep->ep.name);
859 return -ETIMEDOUT;
860 }
861
862 return 0;
863 }
864
865 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
866 {
867 struct usba_ep *ep = to_usba_ep(_ep);
868 struct usba_udc *udc = ep->udc;
869 struct usba_request *req;
870 unsigned long flags;
871 u32 status;
872
873 DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
874 ep->ep.name, req);
875
876 spin_lock_irqsave(&udc->lock, flags);
877
878 list_for_each_entry(req, &ep->queue, queue) {
879 if (&req->req == _req)
880 break;
881 }
882
883 if (&req->req != _req) {
884 spin_unlock_irqrestore(&udc->lock, flags);
885 return -EINVAL;
886 }
887
888 if (req->using_dma) {
889 /*
890 * If this request is currently being transferred,
891 * stop the DMA controller and reset the FIFO.
892 */
893 if (ep->queue.next == &req->queue) {
894 status = usba_dma_readl(ep, STATUS);
895 if (status & USBA_DMA_CH_EN)
896 stop_dma(ep, &status);
897
898 #ifdef CONFIG_USB_GADGET_DEBUG_FS
899 ep->last_dma_status = status;
900 #endif
901
902 usba_writel(udc, EPT_RST, 1 << ep->index);
903
904 usba_update_req(ep, req, status);
905 }
906 }
907
908 /*
909 * Errors should stop the queue from advancing until the
910 * completion function returns.
911 */
912 list_del_init(&req->queue);
913
914 request_complete(ep, req, -ECONNRESET);
915
916 /* Process the next request if any */
917 submit_next_request(ep);
918 spin_unlock_irqrestore(&udc->lock, flags);
919
920 return 0;
921 }
922
923 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
924 {
925 struct usba_ep *ep = to_usba_ep(_ep);
926 struct usba_udc *udc = ep->udc;
927 unsigned long flags;
928 int ret = 0;
929
930 DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
931 value ? "set" : "clear");
932
933 if (!ep->ep.desc) {
934 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
935 ep->ep.name);
936 return -ENODEV;
937 }
938 if (ep->is_isoc) {
939 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
940 ep->ep.name);
941 return -ENOTTY;
942 }
943
944 spin_lock_irqsave(&udc->lock, flags);
945
946 /*
947 * We can't halt IN endpoints while there are still data to be
948 * transferred
949 */
950 if (!list_empty(&ep->queue)
951 || ((value && ep->is_in && (usba_ep_readl(ep, STA)
952 & USBA_BF(BUSY_BANKS, -1L))))) {
953 ret = -EAGAIN;
954 } else {
955 if (value)
956 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
957 else
958 usba_ep_writel(ep, CLR_STA,
959 USBA_FORCE_STALL | USBA_TOGGLE_CLR);
960 usba_ep_readl(ep, STA);
961 }
962
963 spin_unlock_irqrestore(&udc->lock, flags);
964
965 return ret;
966 }
967
968 static int usba_ep_fifo_status(struct usb_ep *_ep)
969 {
970 struct usba_ep *ep = to_usba_ep(_ep);
971
972 return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
973 }
974
975 static void usba_ep_fifo_flush(struct usb_ep *_ep)
976 {
977 struct usba_ep *ep = to_usba_ep(_ep);
978 struct usba_udc *udc = ep->udc;
979
980 usba_writel(udc, EPT_RST, 1 << ep->index);
981 }
982
983 static const struct usb_ep_ops usba_ep_ops = {
984 .enable = usba_ep_enable,
985 .disable = usba_ep_disable,
986 .alloc_request = usba_ep_alloc_request,
987 .free_request = usba_ep_free_request,
988 .queue = usba_ep_queue,
989 .dequeue = usba_ep_dequeue,
990 .set_halt = usba_ep_set_halt,
991 .fifo_status = usba_ep_fifo_status,
992 .fifo_flush = usba_ep_fifo_flush,
993 };
994
995 static int usba_udc_get_frame(struct usb_gadget *gadget)
996 {
997 struct usba_udc *udc = to_usba_udc(gadget);
998
999 return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
1000 }
1001
1002 static int usba_udc_wakeup(struct usb_gadget *gadget)
1003 {
1004 struct usba_udc *udc = to_usba_udc(gadget);
1005 unsigned long flags;
1006 u32 ctrl;
1007 int ret = -EINVAL;
1008
1009 spin_lock_irqsave(&udc->lock, flags);
1010 if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1011 ctrl = usba_readl(udc, CTRL);
1012 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
1013 ret = 0;
1014 }
1015 spin_unlock_irqrestore(&udc->lock, flags);
1016
1017 return ret;
1018 }
1019
1020 static int
1021 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
1022 {
1023 struct usba_udc *udc = to_usba_udc(gadget);
1024 unsigned long flags;
1025
1026 gadget->is_selfpowered = (is_selfpowered != 0);
1027 spin_lock_irqsave(&udc->lock, flags);
1028 if (is_selfpowered)
1029 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
1030 else
1031 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1032 spin_unlock_irqrestore(&udc->lock, flags);
1033
1034 return 0;
1035 }
1036
1037 static int atmel_usba_start(struct usb_gadget *gadget,
1038 struct usb_gadget_driver *driver);
1039 static int atmel_usba_stop(struct usb_gadget *gadget);
1040
1041 static struct usb_ep *atmel_usba_match_ep(struct usb_gadget *gadget,
1042 struct usb_endpoint_descriptor *desc,
1043 struct usb_ss_ep_comp_descriptor *ep_comp)
1044 {
1045 struct usb_ep *_ep;
1046 struct usba_ep *ep;
1047
1048 /* Look at endpoints until an unclaimed one looks usable */
1049 list_for_each_entry(_ep, &gadget->ep_list, ep_list) {
1050 if (usb_gadget_ep_match_desc(gadget, _ep, desc, ep_comp))
1051 goto found_ep;
1052 }
1053 /* Fail */
1054 return NULL;
1055
1056 found_ep:
1057
1058 if (fifo_mode == 0) {
1059 /* Optimize hw fifo size based on ep type and other info */
1060 ep = to_usba_ep(_ep);
1061
1062 switch (usb_endpoint_type(desc)) {
1063 case USB_ENDPOINT_XFER_CONTROL:
1064 break;
1065
1066 case USB_ENDPOINT_XFER_ISOC:
1067 ep->fifo_size = 1024;
1068 ep->nr_banks = 2;
1069 break;
1070
1071 case USB_ENDPOINT_XFER_BULK:
1072 ep->fifo_size = 512;
1073 ep->nr_banks = 1;
1074 break;
1075
1076 case USB_ENDPOINT_XFER_INT:
1077 if (desc->wMaxPacketSize == 0)
1078 ep->fifo_size =
1079 roundup_pow_of_two(_ep->maxpacket_limit);
1080 else
1081 ep->fifo_size =
1082 roundup_pow_of_two(le16_to_cpu(desc->wMaxPacketSize));
1083 ep->nr_banks = 1;
1084 break;
1085 }
1086
1087 /* It might be a little bit late to set this */
1088 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
1089
1090 /* Generate ept_cfg basd on FIFO size and number of banks */
1091 if (ep->fifo_size <= 8)
1092 ep->ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
1093 else
1094 /* LSB is bit 1, not 0 */
1095 ep->ept_cfg =
1096 USBA_BF(EPT_SIZE, fls(ep->fifo_size - 1) - 3);
1097
1098 ep->ept_cfg |= USBA_BF(BK_NUMBER, ep->nr_banks);
1099
1100 ep->udc->configured_ep++;
1101 }
1102
1103 return _ep;
1104 }
1105
1106 static const struct usb_gadget_ops usba_udc_ops = {
1107 .get_frame = usba_udc_get_frame,
1108 .wakeup = usba_udc_wakeup,
1109 .set_selfpowered = usba_udc_set_selfpowered,
1110 .udc_start = atmel_usba_start,
1111 .udc_stop = atmel_usba_stop,
1112 .match_ep = atmel_usba_match_ep,
1113 };
1114
1115 static struct usb_endpoint_descriptor usba_ep0_desc = {
1116 .bLength = USB_DT_ENDPOINT_SIZE,
1117 .bDescriptorType = USB_DT_ENDPOINT,
1118 .bEndpointAddress = 0,
1119 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1120 .wMaxPacketSize = cpu_to_le16(64),
1121 /* FIXME: I have no idea what to put here */
1122 .bInterval = 1,
1123 };
1124
1125 static const struct usb_gadget usba_gadget_template = {
1126 .ops = &usba_udc_ops,
1127 .max_speed = USB_SPEED_HIGH,
1128 .name = "atmel_usba_udc",
1129 };
1130
1131 /*
1132 * Called with interrupts disabled and udc->lock held.
1133 */
1134 static void reset_all_endpoints(struct usba_udc *udc)
1135 {
1136 struct usba_ep *ep;
1137 struct usba_request *req, *tmp_req;
1138
1139 usba_writel(udc, EPT_RST, ~0UL);
1140
1141 ep = to_usba_ep(udc->gadget.ep0);
1142 list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1143 list_del_init(&req->queue);
1144 request_complete(ep, req, -ECONNRESET);
1145 }
1146 }
1147
1148 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1149 {
1150 struct usba_ep *ep;
1151
1152 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1153 return to_usba_ep(udc->gadget.ep0);
1154
1155 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1156 u8 bEndpointAddress;
1157
1158 if (!ep->ep.desc)
1159 continue;
1160 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1161 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1162 continue;
1163 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1164 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1165 return ep;
1166 }
1167
1168 return NULL;
1169 }
1170
1171 /* Called with interrupts disabled and udc->lock held */
1172 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1173 {
1174 usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1175 ep->state = WAIT_FOR_SETUP;
1176 }
1177
1178 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1179 {
1180 if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1181 return 1;
1182 return 0;
1183 }
1184
1185 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1186 {
1187 u32 regval;
1188
1189 DBG(DBG_BUS, "setting address %u...\n", addr);
1190 regval = usba_readl(udc, CTRL);
1191 regval = USBA_BFINS(DEV_ADDR, addr, regval);
1192 usba_writel(udc, CTRL, regval);
1193 }
1194
1195 static int do_test_mode(struct usba_udc *udc)
1196 {
1197 static const char test_packet_buffer[] = {
1198 /* JKJKJKJK * 9 */
1199 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1200 /* JJKKJJKK * 8 */
1201 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1202 /* JJKKJJKK * 8 */
1203 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1204 /* JJJJJJJKKKKKKK * 8 */
1205 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1206 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1207 /* JJJJJJJK * 8 */
1208 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1209 /* {JKKKKKKK * 10}, JK */
1210 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1211 };
1212 struct usba_ep *ep;
1213 struct device *dev = &udc->pdev->dev;
1214 int test_mode;
1215
1216 test_mode = udc->test_mode;
1217
1218 /* Start from a clean slate */
1219 reset_all_endpoints(udc);
1220
1221 switch (test_mode) {
1222 case 0x0100:
1223 /* Test_J */
1224 usba_writel(udc, TST, USBA_TST_J_MODE);
1225 dev_info(dev, "Entering Test_J mode...\n");
1226 break;
1227 case 0x0200:
1228 /* Test_K */
1229 usba_writel(udc, TST, USBA_TST_K_MODE);
1230 dev_info(dev, "Entering Test_K mode...\n");
1231 break;
1232 case 0x0300:
1233 /*
1234 * Test_SE0_NAK: Force high-speed mode and set up ep0
1235 * for Bulk IN transfers
1236 */
1237 ep = &udc->usba_ep[0];
1238 usba_writel(udc, TST,
1239 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1240 usba_ep_writel(ep, CFG,
1241 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1242 | USBA_EPT_DIR_IN
1243 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1244 | USBA_BF(BK_NUMBER, 1));
1245 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1246 set_protocol_stall(udc, ep);
1247 dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1248 } else {
1249 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1250 dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1251 }
1252 break;
1253 case 0x0400:
1254 /* Test_Packet */
1255 ep = &udc->usba_ep[0];
1256 usba_ep_writel(ep, CFG,
1257 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1258 | USBA_EPT_DIR_IN
1259 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1260 | USBA_BF(BK_NUMBER, 1));
1261 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1262 set_protocol_stall(udc, ep);
1263 dev_err(dev, "Test_Packet: ep0 not mapped\n");
1264 } else {
1265 usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1266 usba_writel(udc, TST, USBA_TST_PKT_MODE);
1267 memcpy_toio(ep->fifo, test_packet_buffer,
1268 sizeof(test_packet_buffer));
1269 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1270 dev_info(dev, "Entering Test_Packet mode...\n");
1271 }
1272 break;
1273 default:
1274 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1275 return -EINVAL;
1276 }
1277
1278 return 0;
1279 }
1280
1281 /* Avoid overly long expressions */
1282 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1283 {
1284 if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1285 return true;
1286 return false;
1287 }
1288
1289 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1290 {
1291 if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1292 return true;
1293 return false;
1294 }
1295
1296 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1297 {
1298 if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1299 return true;
1300 return false;
1301 }
1302
1303 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1304 struct usb_ctrlrequest *crq)
1305 {
1306 int retval = 0;
1307
1308 switch (crq->bRequest) {
1309 case USB_REQ_GET_STATUS: {
1310 u16 status;
1311
1312 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1313 status = cpu_to_le16(udc->devstatus);
1314 } else if (crq->bRequestType
1315 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1316 status = cpu_to_le16(0);
1317 } else if (crq->bRequestType
1318 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1319 struct usba_ep *target;
1320
1321 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1322 if (!target)
1323 goto stall;
1324
1325 status = 0;
1326 if (is_stalled(udc, target))
1327 status |= cpu_to_le16(1);
1328 } else
1329 goto delegate;
1330
1331 /* Write directly to the FIFO. No queueing is done. */
1332 if (crq->wLength != cpu_to_le16(sizeof(status)))
1333 goto stall;
1334 ep->state = DATA_STAGE_IN;
1335 writew_relaxed(status, ep->fifo);
1336 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1337 break;
1338 }
1339
1340 case USB_REQ_CLEAR_FEATURE: {
1341 if (crq->bRequestType == USB_RECIP_DEVICE) {
1342 if (feature_is_dev_remote_wakeup(crq))
1343 udc->devstatus
1344 &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1345 else
1346 /* Can't CLEAR_FEATURE TEST_MODE */
1347 goto stall;
1348 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1349 struct usba_ep *target;
1350
1351 if (crq->wLength != cpu_to_le16(0)
1352 || !feature_is_ep_halt(crq))
1353 goto stall;
1354 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1355 if (!target)
1356 goto stall;
1357
1358 usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1359 if (target->index != 0)
1360 usba_ep_writel(target, CLR_STA,
1361 USBA_TOGGLE_CLR);
1362 } else {
1363 goto delegate;
1364 }
1365
1366 send_status(udc, ep);
1367 break;
1368 }
1369
1370 case USB_REQ_SET_FEATURE: {
1371 if (crq->bRequestType == USB_RECIP_DEVICE) {
1372 if (feature_is_dev_test_mode(crq)) {
1373 send_status(udc, ep);
1374 ep->state = STATUS_STAGE_TEST;
1375 udc->test_mode = le16_to_cpu(crq->wIndex);
1376 return 0;
1377 } else if (feature_is_dev_remote_wakeup(crq)) {
1378 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1379 } else {
1380 goto stall;
1381 }
1382 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1383 struct usba_ep *target;
1384
1385 if (crq->wLength != cpu_to_le16(0)
1386 || !feature_is_ep_halt(crq))
1387 goto stall;
1388
1389 target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1390 if (!target)
1391 goto stall;
1392
1393 usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1394 } else
1395 goto delegate;
1396
1397 send_status(udc, ep);
1398 break;
1399 }
1400
1401 case USB_REQ_SET_ADDRESS:
1402 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1403 goto delegate;
1404
1405 set_address(udc, le16_to_cpu(crq->wValue));
1406 send_status(udc, ep);
1407 ep->state = STATUS_STAGE_ADDR;
1408 break;
1409
1410 default:
1411 delegate:
1412 spin_unlock(&udc->lock);
1413 retval = udc->driver->setup(&udc->gadget, crq);
1414 spin_lock(&udc->lock);
1415 }
1416
1417 return retval;
1418
1419 stall:
1420 pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1421 "halting endpoint...\n",
1422 ep->ep.name, crq->bRequestType, crq->bRequest,
1423 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1424 le16_to_cpu(crq->wLength));
1425 set_protocol_stall(udc, ep);
1426 return -1;
1427 }
1428
1429 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1430 {
1431 struct usba_request *req;
1432 u32 epstatus;
1433 u32 epctrl;
1434
1435 restart:
1436 epstatus = usba_ep_readl(ep, STA);
1437 epctrl = usba_ep_readl(ep, CTL);
1438
1439 DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1440 ep->ep.name, ep->state, epstatus, epctrl);
1441
1442 req = NULL;
1443 if (!list_empty(&ep->queue))
1444 req = list_entry(ep->queue.next,
1445 struct usba_request, queue);
1446
1447 if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1448 if (req->submitted)
1449 next_fifo_transaction(ep, req);
1450 else
1451 submit_request(ep, req);
1452
1453 if (req->last_transaction) {
1454 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1455 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1456 }
1457 goto restart;
1458 }
1459 if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1460 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1461
1462 switch (ep->state) {
1463 case DATA_STAGE_IN:
1464 usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1465 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1466 ep->state = STATUS_STAGE_OUT;
1467 break;
1468 case STATUS_STAGE_ADDR:
1469 /* Activate our new address */
1470 usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1471 | USBA_FADDR_EN));
1472 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1473 ep->state = WAIT_FOR_SETUP;
1474 break;
1475 case STATUS_STAGE_IN:
1476 if (req) {
1477 list_del_init(&req->queue);
1478 request_complete(ep, req, 0);
1479 submit_next_request(ep);
1480 }
1481 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1482 ep->state = WAIT_FOR_SETUP;
1483 break;
1484 case STATUS_STAGE_TEST:
1485 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1486 ep->state = WAIT_FOR_SETUP;
1487 if (do_test_mode(udc))
1488 set_protocol_stall(udc, ep);
1489 break;
1490 default:
1491 pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1492 "halting endpoint...\n",
1493 ep->ep.name, ep->state);
1494 set_protocol_stall(udc, ep);
1495 break;
1496 }
1497
1498 goto restart;
1499 }
1500 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1501 switch (ep->state) {
1502 case STATUS_STAGE_OUT:
1503 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1504 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1505
1506 if (req) {
1507 list_del_init(&req->queue);
1508 request_complete(ep, req, 0);
1509 }
1510 ep->state = WAIT_FOR_SETUP;
1511 break;
1512
1513 case DATA_STAGE_OUT:
1514 receive_data(ep);
1515 break;
1516
1517 default:
1518 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1519 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1520 pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1521 "halting endpoint...\n",
1522 ep->ep.name, ep->state);
1523 set_protocol_stall(udc, ep);
1524 break;
1525 }
1526
1527 goto restart;
1528 }
1529 if (epstatus & USBA_RX_SETUP) {
1530 union {
1531 struct usb_ctrlrequest crq;
1532 unsigned long data[2];
1533 } crq;
1534 unsigned int pkt_len;
1535 int ret;
1536
1537 if (ep->state != WAIT_FOR_SETUP) {
1538 /*
1539 * Didn't expect a SETUP packet at this
1540 * point. Clean up any pending requests (which
1541 * may be successful).
1542 */
1543 int status = -EPROTO;
1544
1545 /*
1546 * RXRDY and TXCOMP are dropped when SETUP
1547 * packets arrive. Just pretend we received
1548 * the status packet.
1549 */
1550 if (ep->state == STATUS_STAGE_OUT
1551 || ep->state == STATUS_STAGE_IN) {
1552 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1553 status = 0;
1554 }
1555
1556 if (req) {
1557 list_del_init(&req->queue);
1558 request_complete(ep, req, status);
1559 }
1560 }
1561
1562 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1563 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1564 if (pkt_len != sizeof(crq)) {
1565 pr_warn("udc: Invalid packet length %u (expected %zu)\n",
1566 pkt_len, sizeof(crq));
1567 set_protocol_stall(udc, ep);
1568 return;
1569 }
1570
1571 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1572 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1573
1574 /* Free up one bank in the FIFO so that we can
1575 * generate or receive a reply right away. */
1576 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1577
1578 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1579 ep->state, crq.crq.bRequestType,
1580 crq.crq.bRequest); */
1581
1582 if (crq.crq.bRequestType & USB_DIR_IN) {
1583 /*
1584 * The USB 2.0 spec states that "if wLength is
1585 * zero, there is no data transfer phase."
1586 * However, testusb #14 seems to actually
1587 * expect a data phase even if wLength = 0...
1588 */
1589 ep->state = DATA_STAGE_IN;
1590 } else {
1591 if (crq.crq.wLength != cpu_to_le16(0))
1592 ep->state = DATA_STAGE_OUT;
1593 else
1594 ep->state = STATUS_STAGE_IN;
1595 }
1596
1597 ret = -1;
1598 if (ep->index == 0)
1599 ret = handle_ep0_setup(udc, ep, &crq.crq);
1600 else {
1601 spin_unlock(&udc->lock);
1602 ret = udc->driver->setup(&udc->gadget, &crq.crq);
1603 spin_lock(&udc->lock);
1604 }
1605
1606 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1607 crq.crq.bRequestType, crq.crq.bRequest,
1608 le16_to_cpu(crq.crq.wLength), ep->state, ret);
1609
1610 if (ret < 0) {
1611 /* Let the host know that we failed */
1612 set_protocol_stall(udc, ep);
1613 }
1614 }
1615 }
1616
1617 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1618 {
1619 struct usba_request *req;
1620 u32 epstatus;
1621 u32 epctrl;
1622
1623 epstatus = usba_ep_readl(ep, STA);
1624 epctrl = usba_ep_readl(ep, CTL);
1625
1626 DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1627
1628 while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1629 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1630
1631 if (list_empty(&ep->queue)) {
1632 dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1633 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1634 return;
1635 }
1636
1637 req = list_entry(ep->queue.next, struct usba_request, queue);
1638
1639 if (req->using_dma) {
1640 /* Send a zero-length packet */
1641 usba_ep_writel(ep, SET_STA,
1642 USBA_TX_PK_RDY);
1643 usba_ep_writel(ep, CTL_DIS,
1644 USBA_TX_PK_RDY);
1645 list_del_init(&req->queue);
1646 submit_next_request(ep);
1647 request_complete(ep, req, 0);
1648 } else {
1649 if (req->submitted)
1650 next_fifo_transaction(ep, req);
1651 else
1652 submit_request(ep, req);
1653
1654 if (req->last_transaction) {
1655 list_del_init(&req->queue);
1656 submit_next_request(ep);
1657 request_complete(ep, req, 0);
1658 }
1659 }
1660
1661 epstatus = usba_ep_readl(ep, STA);
1662 epctrl = usba_ep_readl(ep, CTL);
1663 }
1664 if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1665 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1666 receive_data(ep);
1667 }
1668 }
1669
1670 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1671 {
1672 struct usba_request *req;
1673 u32 status, control, pending;
1674
1675 status = usba_dma_readl(ep, STATUS);
1676 control = usba_dma_readl(ep, CONTROL);
1677 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1678 ep->last_dma_status = status;
1679 #endif
1680 pending = status & control;
1681 DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1682
1683 if (status & USBA_DMA_CH_EN) {
1684 dev_err(&udc->pdev->dev,
1685 "DMA_CH_EN is set after transfer is finished!\n");
1686 dev_err(&udc->pdev->dev,
1687 "status=%#08x, pending=%#08x, control=%#08x\n",
1688 status, pending, control);
1689
1690 /*
1691 * try to pretend nothing happened. We might have to
1692 * do something here...
1693 */
1694 }
1695
1696 if (list_empty(&ep->queue))
1697 /* Might happen if a reset comes along at the right moment */
1698 return;
1699
1700 if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1701 req = list_entry(ep->queue.next, struct usba_request, queue);
1702 usba_update_req(ep, req, status);
1703
1704 list_del_init(&req->queue);
1705 submit_next_request(ep);
1706 request_complete(ep, req, 0);
1707 }
1708 }
1709
1710 static int start_clock(struct usba_udc *udc);
1711 static void stop_clock(struct usba_udc *udc);
1712
1713 static irqreturn_t usba_udc_irq(int irq, void *devid)
1714 {
1715 struct usba_udc *udc = devid;
1716 u32 status, int_enb;
1717 u32 dma_status;
1718 u32 ep_status;
1719
1720 spin_lock(&udc->lock);
1721
1722 int_enb = usba_int_enb_get(udc);
1723 status = usba_readl(udc, INT_STA) & (int_enb | USBA_HIGH_SPEED);
1724 DBG(DBG_INT, "irq, status=%#08x\n", status);
1725
1726 if (status & USBA_DET_SUSPEND) {
1727 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND|USBA_WAKE_UP);
1728 usba_int_enb_set(udc, USBA_WAKE_UP);
1729 usba_int_enb_clear(udc, USBA_DET_SUSPEND);
1730 udc->suspended = true;
1731 toggle_bias(udc, 0);
1732 udc->bias_pulse_needed = true;
1733 stop_clock(udc);
1734 DBG(DBG_BUS, "Suspend detected\n");
1735 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1736 && udc->driver && udc->driver->suspend) {
1737 spin_unlock(&udc->lock);
1738 udc->driver->suspend(&udc->gadget);
1739 spin_lock(&udc->lock);
1740 }
1741 }
1742
1743 if (status & USBA_WAKE_UP) {
1744 start_clock(udc);
1745 toggle_bias(udc, 1);
1746 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1747 DBG(DBG_BUS, "Wake Up CPU detected\n");
1748 }
1749
1750 if (status & USBA_END_OF_RESUME) {
1751 udc->suspended = false;
1752 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1753 usba_int_enb_clear(udc, USBA_WAKE_UP);
1754 usba_int_enb_set(udc, USBA_DET_SUSPEND);
1755 generate_bias_pulse(udc);
1756 DBG(DBG_BUS, "Resume detected\n");
1757 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1758 && udc->driver && udc->driver->resume) {
1759 spin_unlock(&udc->lock);
1760 udc->driver->resume(&udc->gadget);
1761 spin_lock(&udc->lock);
1762 }
1763 }
1764
1765 dma_status = USBA_BFEXT(DMA_INT, status);
1766 if (dma_status) {
1767 int i;
1768
1769 usba_int_enb_set(udc, USBA_DET_SUSPEND);
1770
1771 for (i = 1; i <= USBA_NR_DMAS; i++)
1772 if (dma_status & (1 << i))
1773 usba_dma_irq(udc, &udc->usba_ep[i]);
1774 }
1775
1776 ep_status = USBA_BFEXT(EPT_INT, status);
1777 if (ep_status) {
1778 int i;
1779
1780 usba_int_enb_set(udc, USBA_DET_SUSPEND);
1781
1782 for (i = 0; i < udc->num_ep; i++)
1783 if (ep_status & (1 << i)) {
1784 if (ep_is_control(&udc->usba_ep[i]))
1785 usba_control_irq(udc, &udc->usba_ep[i]);
1786 else
1787 usba_ep_irq(udc, &udc->usba_ep[i]);
1788 }
1789 }
1790
1791 if (status & USBA_END_OF_RESET) {
1792 struct usba_ep *ep0, *ep;
1793 int i, n;
1794
1795 usba_writel(udc, INT_CLR,
1796 USBA_END_OF_RESET|USBA_END_OF_RESUME
1797 |USBA_DET_SUSPEND|USBA_WAKE_UP);
1798 generate_bias_pulse(udc);
1799 reset_all_endpoints(udc);
1800
1801 if (udc->gadget.speed != USB_SPEED_UNKNOWN && udc->driver) {
1802 udc->gadget.speed = USB_SPEED_UNKNOWN;
1803 spin_unlock(&udc->lock);
1804 usb_gadget_udc_reset(&udc->gadget, udc->driver);
1805 spin_lock(&udc->lock);
1806 }
1807
1808 if (status & USBA_HIGH_SPEED)
1809 udc->gadget.speed = USB_SPEED_HIGH;
1810 else
1811 udc->gadget.speed = USB_SPEED_FULL;
1812 DBG(DBG_BUS, "%s bus reset detected\n",
1813 usb_speed_string(udc->gadget.speed));
1814
1815 ep0 = &udc->usba_ep[0];
1816 ep0->ep.desc = &usba_ep0_desc;
1817 ep0->state = WAIT_FOR_SETUP;
1818 usba_ep_writel(ep0, CFG,
1819 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1820 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1821 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1822 usba_ep_writel(ep0, CTL_ENB,
1823 USBA_EPT_ENABLE | USBA_RX_SETUP);
1824
1825 /* If we get reset while suspended... */
1826 udc->suspended = false;
1827 usba_int_enb_clear(udc, USBA_WAKE_UP);
1828
1829 usba_int_enb_set(udc, USBA_BF(EPT_INT, 1) |
1830 USBA_DET_SUSPEND | USBA_END_OF_RESUME);
1831
1832 /*
1833 * Unclear why we hit this irregularly, e.g. in usbtest,
1834 * but it's clearly harmless...
1835 */
1836 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1837 dev_err(&udc->pdev->dev,
1838 "ODD: EP0 configuration is invalid!\n");
1839
1840 /* Preallocate other endpoints */
1841 n = fifo_mode ? udc->num_ep : udc->configured_ep;
1842 for (i = 1; i < n; i++) {
1843 ep = &udc->usba_ep[i];
1844 usba_ep_writel(ep, CFG, ep->ept_cfg);
1845 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED))
1846 dev_err(&udc->pdev->dev,
1847 "ODD: EP%d configuration is invalid!\n", i);
1848 }
1849 }
1850
1851 spin_unlock(&udc->lock);
1852
1853 return IRQ_HANDLED;
1854 }
1855
1856 static int start_clock(struct usba_udc *udc)
1857 {
1858 int ret;
1859
1860 if (udc->clocked)
1861 return 0;
1862
1863 pm_stay_awake(&udc->pdev->dev);
1864
1865 ret = clk_prepare_enable(udc->pclk);
1866 if (ret)
1867 return ret;
1868 ret = clk_prepare_enable(udc->hclk);
1869 if (ret) {
1870 clk_disable_unprepare(udc->pclk);
1871 return ret;
1872 }
1873
1874 udc->clocked = true;
1875 return 0;
1876 }
1877
1878 static void stop_clock(struct usba_udc *udc)
1879 {
1880 if (!udc->clocked)
1881 return;
1882
1883 clk_disable_unprepare(udc->hclk);
1884 clk_disable_unprepare(udc->pclk);
1885
1886 udc->clocked = false;
1887
1888 pm_relax(&udc->pdev->dev);
1889 }
1890
1891 static int usba_start(struct usba_udc *udc)
1892 {
1893 unsigned long flags;
1894 int ret;
1895
1896 ret = start_clock(udc);
1897 if (ret)
1898 return ret;
1899
1900 if (udc->suspended)
1901 return 0;
1902
1903 spin_lock_irqsave(&udc->lock, flags);
1904 toggle_bias(udc, 1);
1905 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1906 /* Clear all requested and pending interrupts... */
1907 usba_writel(udc, INT_ENB, 0);
1908 udc->int_enb_cache = 0;
1909 usba_writel(udc, INT_CLR,
1910 USBA_END_OF_RESET|USBA_END_OF_RESUME
1911 |USBA_DET_SUSPEND|USBA_WAKE_UP);
1912 /* ...and enable just 'reset' IRQ to get us started */
1913 usba_int_enb_set(udc, USBA_END_OF_RESET);
1914 spin_unlock_irqrestore(&udc->lock, flags);
1915
1916 return 0;
1917 }
1918
1919 static void usba_stop(struct usba_udc *udc)
1920 {
1921 unsigned long flags;
1922
1923 if (udc->suspended)
1924 return;
1925
1926 spin_lock_irqsave(&udc->lock, flags);
1927 udc->gadget.speed = USB_SPEED_UNKNOWN;
1928 reset_all_endpoints(udc);
1929
1930 /* This will also disable the DP pullup */
1931 toggle_bias(udc, 0);
1932 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1933 spin_unlock_irqrestore(&udc->lock, flags);
1934
1935 stop_clock(udc);
1936 }
1937
1938 static irqreturn_t usba_vbus_irq_thread(int irq, void *devid)
1939 {
1940 struct usba_udc *udc = devid;
1941 int vbus;
1942
1943 /* debounce */
1944 udelay(10);
1945
1946 mutex_lock(&udc->vbus_mutex);
1947
1948 vbus = vbus_is_present(udc);
1949 if (vbus != udc->vbus_prev) {
1950 if (vbus) {
1951 usba_start(udc);
1952 } else {
1953 udc->suspended = false;
1954 if (udc->driver->disconnect)
1955 udc->driver->disconnect(&udc->gadget);
1956
1957 usba_stop(udc);
1958 }
1959 udc->vbus_prev = vbus;
1960 }
1961
1962 mutex_unlock(&udc->vbus_mutex);
1963 return IRQ_HANDLED;
1964 }
1965
1966 static int atmel_usba_start(struct usb_gadget *gadget,
1967 struct usb_gadget_driver *driver)
1968 {
1969 int ret;
1970 struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1971 unsigned long flags;
1972
1973 spin_lock_irqsave(&udc->lock, flags);
1974 udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1975 udc->driver = driver;
1976 spin_unlock_irqrestore(&udc->lock, flags);
1977
1978 mutex_lock(&udc->vbus_mutex);
1979
1980 if (udc->vbus_pin)
1981 enable_irq(gpiod_to_irq(udc->vbus_pin));
1982
1983 /* If Vbus is present, enable the controller and wait for reset */
1984 udc->vbus_prev = vbus_is_present(udc);
1985 if (udc->vbus_prev) {
1986 ret = usba_start(udc);
1987 if (ret)
1988 goto err;
1989 }
1990
1991 mutex_unlock(&udc->vbus_mutex);
1992 return 0;
1993
1994 err:
1995 if (udc->vbus_pin)
1996 disable_irq(gpiod_to_irq(udc->vbus_pin));
1997
1998 mutex_unlock(&udc->vbus_mutex);
1999
2000 spin_lock_irqsave(&udc->lock, flags);
2001 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
2002 udc->driver = NULL;
2003 spin_unlock_irqrestore(&udc->lock, flags);
2004 return ret;
2005 }
2006
2007 static int atmel_usba_stop(struct usb_gadget *gadget)
2008 {
2009 struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
2010
2011 if (udc->vbus_pin)
2012 disable_irq(gpiod_to_irq(udc->vbus_pin));
2013
2014 if (fifo_mode == 0)
2015 udc->configured_ep = 1;
2016
2017 udc->suspended = false;
2018 usba_stop(udc);
2019
2020 udc->driver = NULL;
2021
2022 return 0;
2023 }
2024
2025 static void at91sam9rl_toggle_bias(struct usba_udc *udc, int is_on)
2026 {
2027 regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
2028 is_on ? AT91_PMC_BIASEN : 0);
2029 }
2030
2031 static void at91sam9g45_pulse_bias(struct usba_udc *udc)
2032 {
2033 regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN, 0);
2034 regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
2035 AT91_PMC_BIASEN);
2036 }
2037
2038 static const struct usba_udc_errata at91sam9rl_errata = {
2039 .toggle_bias = at91sam9rl_toggle_bias,
2040 };
2041
2042 static const struct usba_udc_errata at91sam9g45_errata = {
2043 .pulse_bias = at91sam9g45_pulse_bias,
2044 };
2045
2046 static const struct of_device_id atmel_udc_dt_ids[] = {
2047 { .compatible = "atmel,at91sam9rl-udc", .data = &at91sam9rl_errata },
2048 { .compatible = "atmel,at91sam9g45-udc", .data = &at91sam9g45_errata },
2049 { .compatible = "atmel,sama5d3-udc" },
2050 { /* sentinel */ }
2051 };
2052
2053 MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
2054
2055 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
2056 struct usba_udc *udc)
2057 {
2058 u32 val;
2059 struct device_node *np = pdev->dev.of_node;
2060 const struct of_device_id *match;
2061 struct device_node *pp;
2062 int i, ret;
2063 struct usba_ep *eps, *ep;
2064
2065 match = of_match_node(atmel_udc_dt_ids, np);
2066 if (!match)
2067 return ERR_PTR(-EINVAL);
2068
2069 udc->errata = match->data;
2070 udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9g45-pmc");
2071 if (IS_ERR(udc->pmc))
2072 udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9rl-pmc");
2073 if (IS_ERR(udc->pmc))
2074 udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9x5-pmc");
2075 if (udc->errata && IS_ERR(udc->pmc))
2076 return ERR_CAST(udc->pmc);
2077
2078 udc->num_ep = 0;
2079
2080 udc->vbus_pin = devm_gpiod_get_optional(&pdev->dev, "atmel,vbus",
2081 GPIOD_IN);
2082
2083 if (fifo_mode == 0) {
2084 pp = NULL;
2085 while ((pp = of_get_next_child(np, pp)))
2086 udc->num_ep++;
2087 udc->configured_ep = 1;
2088 } else {
2089 udc->num_ep = usba_config_fifo_table(udc);
2090 }
2091
2092 eps = devm_kcalloc(&pdev->dev, udc->num_ep, sizeof(struct usba_ep),
2093 GFP_KERNEL);
2094 if (!eps)
2095 return ERR_PTR(-ENOMEM);
2096
2097 udc->gadget.ep0 = &eps[0].ep;
2098
2099 INIT_LIST_HEAD(&eps[0].ep.ep_list);
2100
2101 pp = NULL;
2102 i = 0;
2103 while ((pp = of_get_next_child(np, pp)) && i < udc->num_ep) {
2104 ep = &eps[i];
2105
2106 ret = of_property_read_u32(pp, "reg", &val);
2107 if (ret) {
2108 dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
2109 goto err;
2110 }
2111 ep->index = fifo_mode ? udc->fifo_cfg[i].hw_ep_num : val;
2112
2113 ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
2114 if (ret) {
2115 dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
2116 goto err;
2117 }
2118 if (fifo_mode) {
2119 if (val < udc->fifo_cfg[i].fifo_size) {
2120 dev_warn(&pdev->dev,
2121 "Using max fifo-size value from DT\n");
2122 ep->fifo_size = val;
2123 } else {
2124 ep->fifo_size = udc->fifo_cfg[i].fifo_size;
2125 }
2126 } else {
2127 ep->fifo_size = val;
2128 }
2129
2130 ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
2131 if (ret) {
2132 dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
2133 goto err;
2134 }
2135 if (fifo_mode) {
2136 if (val < udc->fifo_cfg[i].nr_banks) {
2137 dev_warn(&pdev->dev,
2138 "Using max nb-banks value from DT\n");
2139 ep->nr_banks = val;
2140 } else {
2141 ep->nr_banks = udc->fifo_cfg[i].nr_banks;
2142 }
2143 } else {
2144 ep->nr_banks = val;
2145 }
2146
2147 ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
2148 ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");
2149
2150 sprintf(ep->name, "ep%d", ep->index);
2151 ep->ep.name = ep->name;
2152
2153 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
2154 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
2155 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
2156 ep->ep.ops = &usba_ep_ops;
2157 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
2158 ep->udc = udc;
2159 INIT_LIST_HEAD(&ep->queue);
2160
2161 if (ep->index == 0) {
2162 ep->ep.caps.type_control = true;
2163 } else {
2164 ep->ep.caps.type_iso = ep->can_isoc;
2165 ep->ep.caps.type_bulk = true;
2166 ep->ep.caps.type_int = true;
2167 }
2168
2169 ep->ep.caps.dir_in = true;
2170 ep->ep.caps.dir_out = true;
2171
2172 if (fifo_mode != 0) {
2173 /*
2174 * Generate ept_cfg based on FIFO size and
2175 * banks number
2176 */
2177 if (ep->fifo_size <= 8)
2178 ep->ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
2179 else
2180 /* LSB is bit 1, not 0 */
2181 ep->ept_cfg =
2182 USBA_BF(EPT_SIZE, fls(ep->fifo_size - 1) - 3);
2183
2184 ep->ept_cfg |= USBA_BF(BK_NUMBER, ep->nr_banks);
2185 }
2186
2187 if (i)
2188 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
2189
2190 i++;
2191 }
2192
2193 if (i == 0) {
2194 dev_err(&pdev->dev, "of_probe: no endpoint specified\n");
2195 ret = -EINVAL;
2196 goto err;
2197 }
2198
2199 return eps;
2200 err:
2201 return ERR_PTR(ret);
2202 }
2203
2204 static int usba_udc_probe(struct platform_device *pdev)
2205 {
2206 struct resource *res;
2207 struct clk *pclk, *hclk;
2208 struct usba_udc *udc;
2209 int irq, ret, i;
2210
2211 udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
2212 if (!udc)
2213 return -ENOMEM;
2214
2215 udc->gadget = usba_gadget_template;
2216 INIT_LIST_HEAD(&udc->gadget.ep_list);
2217
2218 res = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
2219 udc->regs = devm_ioremap_resource(&pdev->dev, res);
2220 if (IS_ERR(udc->regs))
2221 return PTR_ERR(udc->regs);
2222 dev_info(&pdev->dev, "MMIO registers at %pR mapped at %p\n",
2223 res, udc->regs);
2224
2225 res = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
2226 udc->fifo = devm_ioremap_resource(&pdev->dev, res);
2227 if (IS_ERR(udc->fifo))
2228 return PTR_ERR(udc->fifo);
2229 dev_info(&pdev->dev, "FIFO at %pR mapped at %p\n", res, udc->fifo);
2230
2231 irq = platform_get_irq(pdev, 0);
2232 if (irq < 0)
2233 return irq;
2234
2235 pclk = devm_clk_get(&pdev->dev, "pclk");
2236 if (IS_ERR(pclk))
2237 return PTR_ERR(pclk);
2238 hclk = devm_clk_get(&pdev->dev, "hclk");
2239 if (IS_ERR(hclk))
2240 return PTR_ERR(hclk);
2241
2242 spin_lock_init(&udc->lock);
2243 mutex_init(&udc->vbus_mutex);
2244 udc->pdev = pdev;
2245 udc->pclk = pclk;
2246 udc->hclk = hclk;
2247
2248 platform_set_drvdata(pdev, udc);
2249
2250 /* Make sure we start from a clean slate */
2251 ret = clk_prepare_enable(pclk);
2252 if (ret) {
2253 dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
2254 return ret;
2255 }
2256
2257 usba_writel(udc, CTRL, USBA_DISABLE_MASK);
2258 clk_disable_unprepare(pclk);
2259
2260 udc->usba_ep = atmel_udc_of_init(pdev, udc);
2261
2262 toggle_bias(udc, 0);
2263
2264 if (IS_ERR(udc->usba_ep))
2265 return PTR_ERR(udc->usba_ep);
2266
2267 ret = devm_request_irq(&pdev->dev, irq, usba_udc_irq, 0,
2268 "atmel_usba_udc", udc);
2269 if (ret) {
2270 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
2271 irq, ret);
2272 return ret;
2273 }
2274 udc->irq = irq;
2275
2276 if (udc->vbus_pin) {
2277 irq_set_status_flags(gpiod_to_irq(udc->vbus_pin), IRQ_NOAUTOEN);
2278 ret = devm_request_threaded_irq(&pdev->dev,
2279 gpiod_to_irq(udc->vbus_pin), NULL,
2280 usba_vbus_irq_thread, USBA_VBUS_IRQFLAGS,
2281 "atmel_usba_udc", udc);
2282 if (ret) {
2283 udc->vbus_pin = NULL;
2284 dev_warn(&udc->pdev->dev,
2285 "failed to request vbus irq; "
2286 "assuming always on\n");
2287 }
2288 }
2289
2290 ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2291 if (ret)
2292 return ret;
2293 device_init_wakeup(&pdev->dev, 1);
2294
2295 usba_init_debugfs(udc);
2296 for (i = 1; i < udc->num_ep; i++)
2297 usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
2298
2299 return 0;
2300 }
2301
2302 static int usba_udc_remove(struct platform_device *pdev)
2303 {
2304 struct usba_udc *udc;
2305 int i;
2306
2307 udc = platform_get_drvdata(pdev);
2308
2309 device_init_wakeup(&pdev->dev, 0);
2310 usb_del_gadget_udc(&udc->gadget);
2311
2312 for (i = 1; i < udc->num_ep; i++)
2313 usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
2314 usba_cleanup_debugfs(udc);
2315
2316 return 0;
2317 }
2318
2319 #ifdef CONFIG_PM_SLEEP
2320 static int usba_udc_suspend(struct device *dev)
2321 {
2322 struct usba_udc *udc = dev_get_drvdata(dev);
2323
2324 /* Not started */
2325 if (!udc->driver)
2326 return 0;
2327
2328 mutex_lock(&udc->vbus_mutex);
2329
2330 if (!device_may_wakeup(dev)) {
2331 udc->suspended = false;
2332 usba_stop(udc);
2333 goto out;
2334 }
2335
2336 /*
2337 * Device may wake up. We stay clocked if we failed
2338 * to request vbus irq, assuming always on.
2339 */
2340 if (udc->vbus_pin) {
2341 /* FIXME: right to stop here...??? */
2342 usba_stop(udc);
2343 enable_irq_wake(gpiod_to_irq(udc->vbus_pin));
2344 }
2345
2346 enable_irq_wake(udc->irq);
2347
2348 out:
2349 mutex_unlock(&udc->vbus_mutex);
2350 return 0;
2351 }
2352
2353 static int usba_udc_resume(struct device *dev)
2354 {
2355 struct usba_udc *udc = dev_get_drvdata(dev);
2356
2357 /* Not started */
2358 if (!udc->driver)
2359 return 0;
2360
2361 if (device_may_wakeup(dev)) {
2362 if (udc->vbus_pin)
2363 disable_irq_wake(gpiod_to_irq(udc->vbus_pin));
2364
2365 disable_irq_wake(udc->irq);
2366 }
2367
2368 /* If Vbus is present, enable the controller and wait for reset */
2369 mutex_lock(&udc->vbus_mutex);
2370 udc->vbus_prev = vbus_is_present(udc);
2371 if (udc->vbus_prev)
2372 usba_start(udc);
2373 mutex_unlock(&udc->vbus_mutex);
2374
2375 return 0;
2376 }
2377 #endif
2378
2379 static SIMPLE_DEV_PM_OPS(usba_udc_pm_ops, usba_udc_suspend, usba_udc_resume);
2380
2381 static struct platform_driver udc_driver = {
2382 .remove = usba_udc_remove,
2383 .driver = {
2384 .name = "atmel_usba_udc",
2385 .pm = &usba_udc_pm_ops,
2386 .of_match_table = atmel_udc_dt_ids,
2387 },
2388 };
2389
2390 module_platform_driver_probe(udc_driver, usba_udc_probe);
2391
2392 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2393 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2394 MODULE_LICENSE("GPL");
2395 MODULE_ALIAS("platform:atmel_usba_udc");
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