1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * mtu3_gadget_ep0.c - MediaTek USB3 DRD peripheral driver ep0 handling
4 *
5 * Copyright (c) 2016 MediaTek Inc.
6 *
7 * Author: Chunfeng.Yun <chunfeng.yun@mediatek.com>
8 */
9
10 #include <linux/iopoll.h>
11 #include <linux/usb/composite.h>
12
13 #include "mtu3.h"
14 #include "mtu3_debug.h"
15 #include "mtu3_trace.h"
16
17 /* ep0 is always mtu3->in_eps[0] */
18 #define next_ep0_request(mtu) next_request((mtu)->ep0)
19
20 /* for high speed test mode; see USB 2.0 spec 7.1.20 */
21 static const u8 mtu3_test_packet[53] = {
22 /* implicit SYNC then DATA0 to start */
23
24 /* JKJKJKJK x9 */
25 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
26 /* JJKKJJKK x8 */
27 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
28 /* JJJJKKKK x8 */
29 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
30 /* JJJJJJJKKKKKKK x8 */
31 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
32 /* JJJJJJJK x8 */
33 0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd,
34 /* JKKKKKKK x10, JK */
35 0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e,
36 /* implicit CRC16 then EOP to end */
37 };
38
decode_ep0_state(struct mtu3 * mtu)39 static char *decode_ep0_state(struct mtu3 *mtu)
40 {
41 switch (mtu->ep0_state) {
42 case MU3D_EP0_STATE_SETUP:
43 return "SETUP";
44 case MU3D_EP0_STATE_TX:
45 return "IN";
46 case MU3D_EP0_STATE_RX:
47 return "OUT";
48 case MU3D_EP0_STATE_TX_END:
49 return "TX-END";
50 case MU3D_EP0_STATE_STALL:
51 return "STALL";
52 default:
53 return "??";
54 }
55 }
56
ep0_req_giveback(struct mtu3 * mtu,struct usb_request * req)57 static void ep0_req_giveback(struct mtu3 *mtu, struct usb_request *req)
58 {
59 mtu3_req_complete(mtu->ep0, req, 0);
60 }
61
62 static int
forward_to_driver(struct mtu3 * mtu,const struct usb_ctrlrequest * setup)63 forward_to_driver(struct mtu3 *mtu, const struct usb_ctrlrequest *setup)
64 __releases(mtu->lock)
65 __acquires(mtu->lock)
66 {
67 int ret;
68
69 if (!mtu->gadget_driver)
70 return -EOPNOTSUPP;
71
72 spin_unlock(&mtu->lock);
73 ret = mtu->gadget_driver->setup(&mtu->g, setup);
74 spin_lock(&mtu->lock);
75
76 dev_dbg(mtu->dev, "%s ret %d\n", __func__, ret);
77 return ret;
78 }
79
ep0_write_fifo(struct mtu3_ep * mep,const u8 * src,u16 len)80 static void ep0_write_fifo(struct mtu3_ep *mep, const u8 *src, u16 len)
81 {
82 void __iomem *fifo = mep->mtu->mac_base + U3D_FIFO0;
83 u16 index = 0;
84
85 dev_dbg(mep->mtu->dev, "%s: ep%din, len=%d, buf=%p\n",
86 __func__, mep->epnum, len, src);
87
88 if (len >= 4) {
89 iowrite32_rep(fifo, src, len >> 2);
90 index = len & ~0x03;
91 }
92 if (len & 0x02) {
93 writew(*(u16 *)&src[index], fifo);
94 index += 2;
95 }
96 if (len & 0x01)
97 writeb(src[index], fifo);
98 }
99
ep0_read_fifo(struct mtu3_ep * mep,u8 * dst,u16 len)100 static void ep0_read_fifo(struct mtu3_ep *mep, u8 *dst, u16 len)
101 {
102 void __iomem *fifo = mep->mtu->mac_base + U3D_FIFO0;
103 u32 value;
104 u16 index = 0;
105
106 dev_dbg(mep->mtu->dev, "%s: ep%dout len=%d buf=%p\n",
107 __func__, mep->epnum, len, dst);
108
109 if (len >= 4) {
110 ioread32_rep(fifo, dst, len >> 2);
111 index = len & ~0x03;
112 }
113 if (len & 0x3) {
114 value = readl(fifo);
115 memcpy(&dst[index], &value, len & 0x3);
116 }
117
118 }
119
ep0_load_test_packet(struct mtu3 * mtu)120 static void ep0_load_test_packet(struct mtu3 *mtu)
121 {
122 /*
123 * because the length of test packet is less than max packet of HS ep0,
124 * write it into fifo directly.
125 */
126 ep0_write_fifo(mtu->ep0, mtu3_test_packet, sizeof(mtu3_test_packet));
127 }
128
129 /*
130 * A. send STALL for setup transfer without data stage:
131 * set SENDSTALL and SETUPPKTRDY at the same time;
132 * B. send STALL for other cases:
133 * set SENDSTALL only.
134 */
ep0_stall_set(struct mtu3_ep * mep0,bool set,u32 pktrdy)135 static void ep0_stall_set(struct mtu3_ep *mep0, bool set, u32 pktrdy)
136 {
137 struct mtu3 *mtu = mep0->mtu;
138 void __iomem *mbase = mtu->mac_base;
139 u32 csr;
140
141 /* EP0_SENTSTALL is W1C */
142 csr = mtu3_readl(mbase, U3D_EP0CSR) & EP0_W1C_BITS;
143 if (set)
144 csr |= EP0_SENDSTALL | pktrdy;
145 else
146 csr = (csr & ~EP0_SENDSTALL) | EP0_SENTSTALL;
147 mtu3_writel(mtu->mac_base, U3D_EP0CSR, csr);
148
149 mtu->delayed_status = false;
150 mtu->ep0_state = MU3D_EP0_STATE_SETUP;
151
152 dev_dbg(mtu->dev, "ep0: %s STALL, ep0_state: %s\n",
153 set ? "SEND" : "CLEAR", decode_ep0_state(mtu));
154 }
155
ep0_do_status_stage(struct mtu3 * mtu)156 static void ep0_do_status_stage(struct mtu3 *mtu)
157 {
158 void __iomem *mbase = mtu->mac_base;
159 u32 value;
160
161 value = mtu3_readl(mbase, U3D_EP0CSR) & EP0_W1C_BITS;
162 mtu3_writel(mbase, U3D_EP0CSR, value | EP0_SETUPPKTRDY | EP0_DATAEND);
163 }
164
165 static int ep0_queue(struct mtu3_ep *mep0, struct mtu3_request *mreq);
166
ep0_dummy_complete(struct usb_ep * ep,struct usb_request * req)167 static void ep0_dummy_complete(struct usb_ep *ep, struct usb_request *req)
168 {}
169
ep0_set_sel_complete(struct usb_ep * ep,struct usb_request * req)170 static void ep0_set_sel_complete(struct usb_ep *ep, struct usb_request *req)
171 {
172 struct mtu3_request *mreq;
173 struct mtu3 *mtu;
174 struct usb_set_sel_req sel;
175
176 memcpy(&sel, req->buf, sizeof(sel));
177
178 mreq = to_mtu3_request(req);
179 mtu = mreq->mtu;
180 dev_dbg(mtu->dev, "u1sel:%d, u1pel:%d, u2sel:%d, u2pel:%d\n",
181 sel.u1_sel, sel.u1_pel, sel.u2_sel, sel.u2_pel);
182 }
183
184 /* queue data stage to handle 6 byte SET_SEL request */
ep0_set_sel(struct mtu3 * mtu,struct usb_ctrlrequest * setup)185 static int ep0_set_sel(struct mtu3 *mtu, struct usb_ctrlrequest *setup)
186 {
187 int ret;
188 u16 length = le16_to_cpu(setup->wLength);
189
190 if (unlikely(length != 6)) {
191 dev_err(mtu->dev, "%s wrong wLength:%d\n",
192 __func__, length);
193 return -EINVAL;
194 }
195
196 mtu->ep0_req.mep = mtu->ep0;
197 mtu->ep0_req.request.length = 6;
198 mtu->ep0_req.request.buf = mtu->setup_buf;
199 mtu->ep0_req.request.complete = ep0_set_sel_complete;
200 ret = ep0_queue(mtu->ep0, &mtu->ep0_req);
201
202 return ret < 0 ? ret : 1;
203 }
204
205 static int
ep0_get_status(struct mtu3 * mtu,const struct usb_ctrlrequest * setup)206 ep0_get_status(struct mtu3 *mtu, const struct usb_ctrlrequest *setup)
207 {
208 struct mtu3_ep *mep = NULL;
209 int handled = 1;
210 u8 result[2] = {0, 0};
211 u8 epnum = 0;
212 int is_in;
213
214 switch (setup->bRequestType & USB_RECIP_MASK) {
215 case USB_RECIP_DEVICE:
216 result[0] = mtu->is_self_powered << USB_DEVICE_SELF_POWERED;
217 result[0] |= mtu->may_wakeup << USB_DEVICE_REMOTE_WAKEUP;
218
219 if (mtu->g.speed >= USB_SPEED_SUPER) {
220 result[0] |= mtu->u1_enable << USB_DEV_STAT_U1_ENABLED;
221 result[0] |= mtu->u2_enable << USB_DEV_STAT_U2_ENABLED;
222 }
223
224 dev_dbg(mtu->dev, "%s result=%x, U1=%x, U2=%x\n", __func__,
225 result[0], mtu->u1_enable, mtu->u2_enable);
226
227 break;
228 case USB_RECIP_INTERFACE:
229 break;
230 case USB_RECIP_ENDPOINT:
231 epnum = (u8) le16_to_cpu(setup->wIndex);
232 is_in = epnum & USB_DIR_IN;
233 epnum &= USB_ENDPOINT_NUMBER_MASK;
234
235 if (epnum >= mtu->num_eps) {
236 handled = -EINVAL;
237 break;
238 }
239 if (!epnum)
240 break;
241
242 mep = (is_in ? mtu->in_eps : mtu->out_eps) + epnum;
243 if (!mep->desc) {
244 handled = -EINVAL;
245 break;
246 }
247 if (mep->flags & MTU3_EP_STALL)
248 result[0] |= 1 << USB_ENDPOINT_HALT;
249
250 break;
251 default:
252 /* class, vendor, etc ... delegate */
253 handled = 0;
254 break;
255 }
256
257 if (handled > 0) {
258 int ret;
259
260 /* prepare a data stage for GET_STATUS */
261 dev_dbg(mtu->dev, "get_status=%x\n", *(u16 *)result);
262 memcpy(mtu->setup_buf, result, sizeof(result));
263 mtu->ep0_req.mep = mtu->ep0;
264 mtu->ep0_req.request.length = 2;
265 mtu->ep0_req.request.buf = &mtu->setup_buf;
266 mtu->ep0_req.request.complete = ep0_dummy_complete;
267 ret = ep0_queue(mtu->ep0, &mtu->ep0_req);
268 if (ret < 0)
269 handled = ret;
270 }
271 return handled;
272 }
273
handle_test_mode(struct mtu3 * mtu,struct usb_ctrlrequest * setup)274 static int handle_test_mode(struct mtu3 *mtu, struct usb_ctrlrequest *setup)
275 {
276 void __iomem *mbase = mtu->mac_base;
277 int handled = 1;
278 u32 value;
279
280 switch (le16_to_cpu(setup->wIndex) >> 8) {
281 case USB_TEST_J:
282 dev_dbg(mtu->dev, "USB_TEST_J\n");
283 mtu->test_mode_nr = TEST_J_MODE;
284 break;
285 case USB_TEST_K:
286 dev_dbg(mtu->dev, "USB_TEST_K\n");
287 mtu->test_mode_nr = TEST_K_MODE;
288 break;
289 case USB_TEST_SE0_NAK:
290 dev_dbg(mtu->dev, "USB_TEST_SE0_NAK\n");
291 mtu->test_mode_nr = TEST_SE0_NAK_MODE;
292 break;
293 case USB_TEST_PACKET:
294 dev_dbg(mtu->dev, "USB_TEST_PACKET\n");
295 mtu->test_mode_nr = TEST_PACKET_MODE;
296 break;
297 default:
298 handled = -EINVAL;
299 goto out;
300 }
301
302 mtu->test_mode = true;
303
304 /* no TX completion interrupt, and need restart platform after test */
305 if (mtu->test_mode_nr == TEST_PACKET_MODE)
306 ep0_load_test_packet(mtu);
307
308 /* send status before entering test mode. */
309 ep0_do_status_stage(mtu);
310
311 /* wait for ACK status sent by host */
312 readl_poll_timeout_atomic(mbase + U3D_EP0CSR, value,
313 !(value & EP0_DATAEND), 100, 5000);
314
315 mtu3_writel(mbase, U3D_USB2_TEST_MODE, mtu->test_mode_nr);
316
317 mtu->ep0_state = MU3D_EP0_STATE_SETUP;
318
319 out:
320 return handled;
321 }
322
ep0_handle_feature_dev(struct mtu3 * mtu,struct usb_ctrlrequest * setup,bool set)323 static int ep0_handle_feature_dev(struct mtu3 *mtu,
324 struct usb_ctrlrequest *setup, bool set)
325 {
326 void __iomem *mbase = mtu->mac_base;
327 int handled = -EINVAL;
328 u32 lpc;
329
330 switch (le16_to_cpu(setup->wValue)) {
331 case USB_DEVICE_REMOTE_WAKEUP:
332 mtu->may_wakeup = !!set;
333 handled = 1;
334 break;
335 case USB_DEVICE_TEST_MODE:
336 if (!set || (mtu->g.speed != USB_SPEED_HIGH) ||
337 (le16_to_cpu(setup->wIndex) & 0xff))
338 break;
339
340 handled = handle_test_mode(mtu, setup);
341 break;
342 case USB_DEVICE_U1_ENABLE:
343 if (mtu->g.speed < USB_SPEED_SUPER ||
344 mtu->g.state != USB_STATE_CONFIGURED)
345 break;
346
347 lpc = mtu3_readl(mbase, U3D_LINK_POWER_CONTROL);
348 if (set)
349 lpc |= SW_U1_REQUEST_ENABLE;
350 else
351 lpc &= ~SW_U1_REQUEST_ENABLE;
352 mtu3_writel(mbase, U3D_LINK_POWER_CONTROL, lpc);
353
354 mtu->u1_enable = !!set;
355 handled = 1;
356 break;
357 case USB_DEVICE_U2_ENABLE:
358 if (mtu->g.speed < USB_SPEED_SUPER ||
359 mtu->g.state != USB_STATE_CONFIGURED)
360 break;
361
362 lpc = mtu3_readl(mbase, U3D_LINK_POWER_CONTROL);
363 if (set)
364 lpc |= SW_U2_REQUEST_ENABLE;
365 else
366 lpc &= ~SW_U2_REQUEST_ENABLE;
367 mtu3_writel(mbase, U3D_LINK_POWER_CONTROL, lpc);
368
369 mtu->u2_enable = !!set;
370 handled = 1;
371 break;
372 default:
373 handled = -EINVAL;
374 break;
375 }
376 return handled;
377 }
378
ep0_handle_feature(struct mtu3 * mtu,struct usb_ctrlrequest * setup,bool set)379 static int ep0_handle_feature(struct mtu3 *mtu,
380 struct usb_ctrlrequest *setup, bool set)
381 {
382 struct mtu3_ep *mep;
383 int handled = -EINVAL;
384 int is_in;
385 u16 value;
386 u16 index;
387 u8 epnum;
388
389 value = le16_to_cpu(setup->wValue);
390 index = le16_to_cpu(setup->wIndex);
391
392 switch (setup->bRequestType & USB_RECIP_MASK) {
393 case USB_RECIP_DEVICE:
394 handled = ep0_handle_feature_dev(mtu, setup, set);
395 break;
396 case USB_RECIP_INTERFACE:
397 /* superspeed only */
398 if (value == USB_INTRF_FUNC_SUSPEND &&
399 mtu->g.speed >= USB_SPEED_SUPER) {
400 /*
401 * forward the request because function drivers
402 * should handle it
403 */
404 handled = 0;
405 }
406 break;
407 case USB_RECIP_ENDPOINT:
408 epnum = index & USB_ENDPOINT_NUMBER_MASK;
409 if (epnum == 0 || epnum >= mtu->num_eps ||
410 value != USB_ENDPOINT_HALT)
411 break;
412
413 is_in = index & USB_DIR_IN;
414 mep = (is_in ? mtu->in_eps : mtu->out_eps) + epnum;
415 if (!mep->desc)
416 break;
417
418 handled = 1;
419 /* ignore request if endpoint is wedged */
420 if (mep->flags & MTU3_EP_WEDGE)
421 break;
422
423 mtu3_ep_stall_set(mep, set);
424 break;
425 default:
426 /* class, vendor, etc ... delegate */
427 handled = 0;
428 break;
429 }
430 return handled;
431 }
432
433 /*
434 * handle all control requests can be handled
435 * returns:
436 * negative errno - error happened
437 * zero - need delegate SETUP to gadget driver
438 * positive - already handled
439 */
handle_standard_request(struct mtu3 * mtu,struct usb_ctrlrequest * setup)440 static int handle_standard_request(struct mtu3 *mtu,
441 struct usb_ctrlrequest *setup)
442 {
443 void __iomem *mbase = mtu->mac_base;
444 enum usb_device_state state = mtu->g.state;
445 int handled = -EINVAL;
446 u32 dev_conf;
447 u16 value;
448
449 value = le16_to_cpu(setup->wValue);
450
451 /* the gadget driver handles everything except what we must handle */
452 switch (setup->bRequest) {
453 case USB_REQ_SET_ADDRESS:
454 /* change it after the status stage */
455 mtu->address = (u8) (value & 0x7f);
456 dev_dbg(mtu->dev, "set address to 0x%x\n", mtu->address);
457
458 dev_conf = mtu3_readl(mbase, U3D_DEVICE_CONF);
459 dev_conf &= ~DEV_ADDR_MSK;
460 dev_conf |= DEV_ADDR(mtu->address);
461 mtu3_writel(mbase, U3D_DEVICE_CONF, dev_conf);
462
463 if (mtu->address)
464 usb_gadget_set_state(&mtu->g, USB_STATE_ADDRESS);
465 else
466 usb_gadget_set_state(&mtu->g, USB_STATE_DEFAULT);
467
468 handled = 1;
469 break;
470 case USB_REQ_SET_CONFIGURATION:
471 if (state == USB_STATE_ADDRESS) {
472 usb_gadget_set_state(&mtu->g,
473 USB_STATE_CONFIGURED);
474 } else if (state == USB_STATE_CONFIGURED) {
475 /*
476 * USB2 spec sec 9.4.7, if wValue is 0 then dev
477 * is moved to addressed state
478 */
479 if (!value)
480 usb_gadget_set_state(&mtu->g,
481 USB_STATE_ADDRESS);
482 }
483 handled = 0;
484 break;
485 case USB_REQ_CLEAR_FEATURE:
486 handled = ep0_handle_feature(mtu, setup, 0);
487 break;
488 case USB_REQ_SET_FEATURE:
489 handled = ep0_handle_feature(mtu, setup, 1);
490 break;
491 case USB_REQ_GET_STATUS:
492 handled = ep0_get_status(mtu, setup);
493 break;
494 case USB_REQ_SET_SEL:
495 handled = ep0_set_sel(mtu, setup);
496 break;
497 case USB_REQ_SET_ISOCH_DELAY:
498 handled = 1;
499 break;
500 default:
501 /* delegate SET_CONFIGURATION, etc */
502 handled = 0;
503 }
504
505 return handled;
506 }
507
508 /* receive an data packet (OUT) */
ep0_rx_state(struct mtu3 * mtu)509 static void ep0_rx_state(struct mtu3 *mtu)
510 {
511 struct mtu3_request *mreq;
512 struct usb_request *req;
513 void __iomem *mbase = mtu->mac_base;
514 u32 maxp;
515 u32 csr;
516 u16 count = 0;
517
518 dev_dbg(mtu->dev, "%s\n", __func__);
519
520 csr = mtu3_readl(mbase, U3D_EP0CSR) & EP0_W1C_BITS;
521 mreq = next_ep0_request(mtu);
522 req = &mreq->request;
523
524 /* read packet and ack; or stall because of gadget driver bug */
525 if (req) {
526 void *buf = req->buf + req->actual;
527 unsigned int len = req->length - req->actual;
528
529 /* read the buffer */
530 count = mtu3_readl(mbase, U3D_RXCOUNT0);
531 if (count > len) {
532 req->status = -EOVERFLOW;
533 count = len;
534 }
535 ep0_read_fifo(mtu->ep0, buf, count);
536 req->actual += count;
537 csr |= EP0_RXPKTRDY;
538
539 maxp = mtu->g.ep0->maxpacket;
540 if (count < maxp || req->actual == req->length) {
541 mtu->ep0_state = MU3D_EP0_STATE_SETUP;
542 dev_dbg(mtu->dev, "ep0 state: %s\n",
543 decode_ep0_state(mtu));
544
545 csr |= EP0_DATAEND;
546 } else {
547 req = NULL;
548 }
549 } else {
550 csr |= EP0_RXPKTRDY | EP0_SENDSTALL;
551 dev_dbg(mtu->dev, "%s: SENDSTALL\n", __func__);
552 }
553
554 mtu3_writel(mbase, U3D_EP0CSR, csr);
555
556 /* give back the request if have received all data */
557 if (req)
558 ep0_req_giveback(mtu, req);
559
560 }
561
562 /* transmitting to the host (IN) */
ep0_tx_state(struct mtu3 * mtu)563 static void ep0_tx_state(struct mtu3 *mtu)
564 {
565 struct mtu3_request *mreq = next_ep0_request(mtu);
566 struct usb_request *req;
567 u32 csr;
568 u8 *src;
569 u32 count;
570 u32 maxp;
571
572 dev_dbg(mtu->dev, "%s\n", __func__);
573
574 if (!mreq)
575 return;
576
577 maxp = mtu->g.ep0->maxpacket;
578 req = &mreq->request;
579
580 /* load the data */
581 src = (u8 *)req->buf + req->actual;
582 count = min(maxp, req->length - req->actual);
583 if (count)
584 ep0_write_fifo(mtu->ep0, src, count);
585
586 dev_dbg(mtu->dev, "%s act=%d, len=%d, cnt=%d, maxp=%d zero=%d\n",
587 __func__, req->actual, req->length, count, maxp, req->zero);
588
589 req->actual += count;
590
591 if ((count < maxp)
592 || ((req->actual == req->length) && !req->zero))
593 mtu->ep0_state = MU3D_EP0_STATE_TX_END;
594
595 /* send it out, triggering a "txpktrdy cleared" irq */
596 csr = mtu3_readl(mtu->mac_base, U3D_EP0CSR) & EP0_W1C_BITS;
597 mtu3_writel(mtu->mac_base, U3D_EP0CSR, csr | EP0_TXPKTRDY);
598
599 dev_dbg(mtu->dev, "%s ep0csr=0x%x\n", __func__,
600 mtu3_readl(mtu->mac_base, U3D_EP0CSR));
601 }
602
ep0_read_setup(struct mtu3 * mtu,struct usb_ctrlrequest * setup)603 static void ep0_read_setup(struct mtu3 *mtu, struct usb_ctrlrequest *setup)
604 {
605 struct mtu3_request *mreq;
606 u32 count;
607 u32 csr;
608
609 csr = mtu3_readl(mtu->mac_base, U3D_EP0CSR) & EP0_W1C_BITS;
610 count = mtu3_readl(mtu->mac_base, U3D_RXCOUNT0);
611
612 ep0_read_fifo(mtu->ep0, (u8 *)setup, count);
613
614 dev_dbg(mtu->dev, "SETUP req%02x.%02x v%04x i%04x l%04x\n",
615 setup->bRequestType, setup->bRequest,
616 le16_to_cpu(setup->wValue), le16_to_cpu(setup->wIndex),
617 le16_to_cpu(setup->wLength));
618
619 /* clean up any leftover transfers */
620 mreq = next_ep0_request(mtu);
621 if (mreq)
622 ep0_req_giveback(mtu, &mreq->request);
623
624 if (le16_to_cpu(setup->wLength) == 0) {
625 ; /* no data stage, nothing to do */
626 } else if (setup->bRequestType & USB_DIR_IN) {
627 mtu3_writel(mtu->mac_base, U3D_EP0CSR,
628 csr | EP0_SETUPPKTRDY | EP0_DPHTX);
629 mtu->ep0_state = MU3D_EP0_STATE_TX;
630 } else {
631 mtu3_writel(mtu->mac_base, U3D_EP0CSR,
632 (csr | EP0_SETUPPKTRDY) & (~EP0_DPHTX));
633 mtu->ep0_state = MU3D_EP0_STATE_RX;
634 }
635 }
636
ep0_handle_setup(struct mtu3 * mtu)637 static int ep0_handle_setup(struct mtu3 *mtu)
638 __releases(mtu->lock)
639 __acquires(mtu->lock)
640 {
641 struct usb_ctrlrequest setup;
642 struct mtu3_request *mreq;
643 int handled = 0;
644
645 ep0_read_setup(mtu, &setup);
646 trace_mtu3_handle_setup(&setup);
647
648 if ((setup.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
649 handled = handle_standard_request(mtu, &setup);
650
651 dev_dbg(mtu->dev, "handled %d, ep0_state: %s\n",
652 handled, decode_ep0_state(mtu));
653
654 if (handled < 0)
655 goto stall;
656 else if (handled > 0)
657 goto finish;
658
659 handled = forward_to_driver(mtu, &setup);
660 if (handled < 0) {
661 stall:
662 dev_dbg(mtu->dev, "%s stall (%d)\n", __func__, handled);
663
664 ep0_stall_set(mtu->ep0, true,
665 le16_to_cpu(setup.wLength) ? 0 : EP0_SETUPPKTRDY);
666
667 return 0;
668 }
669
670 finish:
671 if (mtu->test_mode) {
672 ; /* nothing to do */
673 } else if (handled == USB_GADGET_DELAYED_STATUS) {
674
675 mreq = next_ep0_request(mtu);
676 if (mreq) {
677 /* already asked us to continue delayed status */
678 ep0_do_status_stage(mtu);
679 ep0_req_giveback(mtu, &mreq->request);
680 } else {
681 /* do delayed STATUS stage till receive ep0_queue */
682 mtu->delayed_status = true;
683 }
684 } else if (le16_to_cpu(setup.wLength) == 0) { /* no data stage */
685
686 ep0_do_status_stage(mtu);
687 /* complete zlp request directly */
688 mreq = next_ep0_request(mtu);
689 if (mreq && !mreq->request.length)
690 ep0_req_giveback(mtu, &mreq->request);
691 }
692
693 return 0;
694 }
695
mtu3_ep0_isr(struct mtu3 * mtu)696 irqreturn_t mtu3_ep0_isr(struct mtu3 *mtu)
697 {
698 void __iomem *mbase = mtu->mac_base;
699 struct mtu3_request *mreq;
700 u32 int_status;
701 irqreturn_t ret = IRQ_NONE;
702 u32 csr;
703 u32 len;
704
705 int_status = mtu3_readl(mbase, U3D_EPISR);
706 int_status &= mtu3_readl(mbase, U3D_EPIER);
707 mtu3_writel(mbase, U3D_EPISR, int_status); /* W1C */
708
709 /* only handle ep0's */
710 if (!(int_status & (EP0ISR | SETUPENDISR)))
711 return IRQ_NONE;
712
713 /* abort current SETUP, and process new one */
714 if (int_status & SETUPENDISR)
715 mtu->ep0_state = MU3D_EP0_STATE_SETUP;
716
717 csr = mtu3_readl(mbase, U3D_EP0CSR);
718
719 dev_dbg(mtu->dev, "%s csr=0x%x\n", __func__, csr);
720
721 /* we sent a stall.. need to clear it now.. */
722 if (csr & EP0_SENTSTALL) {
723 ep0_stall_set(mtu->ep0, false, 0);
724 csr = mtu3_readl(mbase, U3D_EP0CSR);
725 ret = IRQ_HANDLED;
726 }
727 dev_dbg(mtu->dev, "ep0_state: %s\n", decode_ep0_state(mtu));
728 mtu3_dbg_trace(mtu->dev, "ep0_state %s", decode_ep0_state(mtu));
729
730 switch (mtu->ep0_state) {
731 case MU3D_EP0_STATE_TX:
732 /* irq on clearing txpktrdy */
733 if ((csr & EP0_FIFOFULL) == 0) {
734 ep0_tx_state(mtu);
735 ret = IRQ_HANDLED;
736 }
737 break;
738 case MU3D_EP0_STATE_RX:
739 /* irq on set rxpktrdy */
740 if (csr & EP0_RXPKTRDY) {
741 ep0_rx_state(mtu);
742 ret = IRQ_HANDLED;
743 }
744 break;
745 case MU3D_EP0_STATE_TX_END:
746 mtu3_writel(mbase, U3D_EP0CSR,
747 (csr & EP0_W1C_BITS) | EP0_DATAEND);
748
749 mreq = next_ep0_request(mtu);
750 if (mreq)
751 ep0_req_giveback(mtu, &mreq->request);
752
753 mtu->ep0_state = MU3D_EP0_STATE_SETUP;
754 ret = IRQ_HANDLED;
755 dev_dbg(mtu->dev, "ep0_state: %s\n", decode_ep0_state(mtu));
756 break;
757 case MU3D_EP0_STATE_SETUP:
758 if (!(csr & EP0_SETUPPKTRDY))
759 break;
760
761 len = mtu3_readl(mbase, U3D_RXCOUNT0);
762 if (len != 8) {
763 dev_err(mtu->dev, "SETUP packet len %d != 8 ?\n", len);
764 break;
765 }
766
767 ep0_handle_setup(mtu);
768 ret = IRQ_HANDLED;
769 break;
770 default:
771 /* can't happen */
772 ep0_stall_set(mtu->ep0, true, 0);
773 WARN_ON(1);
774 break;
775 }
776
777 return ret;
778 }
779
780
mtu3_ep0_enable(struct usb_ep * ep,const struct usb_endpoint_descriptor * desc)781 static int mtu3_ep0_enable(struct usb_ep *ep,
782 const struct usb_endpoint_descriptor *desc)
783 {
784 /* always enabled */
785 return -EINVAL;
786 }
787
mtu3_ep0_disable(struct usb_ep * ep)788 static int mtu3_ep0_disable(struct usb_ep *ep)
789 {
790 /* always enabled */
791 return -EINVAL;
792 }
793
ep0_queue(struct mtu3_ep * mep,struct mtu3_request * mreq)794 static int ep0_queue(struct mtu3_ep *mep, struct mtu3_request *mreq)
795 {
796 struct mtu3 *mtu = mep->mtu;
797
798 mreq->mtu = mtu;
799 mreq->request.actual = 0;
800 mreq->request.status = -EINPROGRESS;
801
802 dev_dbg(mtu->dev, "%s %s (ep0_state: %s), len#%d\n", __func__,
803 mep->name, decode_ep0_state(mtu), mreq->request.length);
804
805 switch (mtu->ep0_state) {
806 case MU3D_EP0_STATE_SETUP:
807 case MU3D_EP0_STATE_RX: /* control-OUT data */
808 case MU3D_EP0_STATE_TX: /* control-IN data */
809 break;
810 default:
811 dev_err(mtu->dev, "%s, error in ep0 state %s\n", __func__,
812 decode_ep0_state(mtu));
813 return -EINVAL;
814 }
815
816 if (mtu->delayed_status) {
817
818 mtu->delayed_status = false;
819 ep0_do_status_stage(mtu);
820 /* needn't giveback the request for handling delay STATUS */
821 return 0;
822 }
823
824 if (!list_empty(&mep->req_list))
825 return -EBUSY;
826
827 list_add_tail(&mreq->list, &mep->req_list);
828
829 /* sequence #1, IN ... start writing the data */
830 if (mtu->ep0_state == MU3D_EP0_STATE_TX)
831 ep0_tx_state(mtu);
832
833 return 0;
834 }
835
mtu3_ep0_queue(struct usb_ep * ep,struct usb_request * req,gfp_t gfp)836 static int mtu3_ep0_queue(struct usb_ep *ep,
837 struct usb_request *req, gfp_t gfp)
838 {
839 struct mtu3_ep *mep;
840 struct mtu3_request *mreq;
841 struct mtu3 *mtu;
842 unsigned long flags;
843 int ret = 0;
844
845 if (!ep || !req)
846 return -EINVAL;
847
848 mep = to_mtu3_ep(ep);
849 mtu = mep->mtu;
850 mreq = to_mtu3_request(req);
851
852 spin_lock_irqsave(&mtu->lock, flags);
853 ret = ep0_queue(mep, mreq);
854 spin_unlock_irqrestore(&mtu->lock, flags);
855 return ret;
856 }
857
mtu3_ep0_dequeue(struct usb_ep * ep,struct usb_request * req)858 static int mtu3_ep0_dequeue(struct usb_ep *ep, struct usb_request *req)
859 {
860 /* we just won't support this */
861 return -EINVAL;
862 }
863
mtu3_ep0_halt(struct usb_ep * ep,int value)864 static int mtu3_ep0_halt(struct usb_ep *ep, int value)
865 {
866 struct mtu3_ep *mep;
867 struct mtu3 *mtu;
868 unsigned long flags;
869 int ret = 0;
870
871 if (!ep || !value)
872 return -EINVAL;
873
874 mep = to_mtu3_ep(ep);
875 mtu = mep->mtu;
876
877 dev_dbg(mtu->dev, "%s\n", __func__);
878
879 spin_lock_irqsave(&mtu->lock, flags);
880
881 if (!list_empty(&mep->req_list)) {
882 ret = -EBUSY;
883 goto cleanup;
884 }
885
886 switch (mtu->ep0_state) {
887 /*
888 * stalls are usually issued after parsing SETUP packet, either
889 * directly in irq context from setup() or else later.
890 */
891 case MU3D_EP0_STATE_TX:
892 case MU3D_EP0_STATE_TX_END:
893 case MU3D_EP0_STATE_RX:
894 case MU3D_EP0_STATE_SETUP:
895 ep0_stall_set(mtu->ep0, true, 0);
896 break;
897 default:
898 dev_dbg(mtu->dev, "ep0 can't halt in state %s\n",
899 decode_ep0_state(mtu));
900 ret = -EINVAL;
901 }
902
903 cleanup:
904 spin_unlock_irqrestore(&mtu->lock, flags);
905 return ret;
906 }
907
908 const struct usb_ep_ops mtu3_ep0_ops = {
909 .enable = mtu3_ep0_enable,
910 .disable = mtu3_ep0_disable,
911 .alloc_request = mtu3_alloc_request,
912 .free_request = mtu3_free_request,
913 .queue = mtu3_ep0_queue,
914 .dequeue = mtu3_ep0_dequeue,
915 .set_halt = mtu3_ep0_halt,
916 };
917