1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * udc.c - ChipIdea UDC driver
4 *
5 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
6 *
7 * Author: David Lopo
8 */
9
10 #include <linux/delay.h>
11 #include <linux/device.h>
12 #include <linux/dmapool.h>
13 #include <linux/err.h>
14 #include <linux/irqreturn.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/pinctrl/consumer.h>
19 #include <linux/usb/ch9.h>
20 #include <linux/usb/gadget.h>
21 #include <linux/usb/otg-fsm.h>
22 #include <linux/usb/chipidea.h>
23
24 #include "ci.h"
25 #include "udc.h"
26 #include "bits.h"
27 #include "otg.h"
28 #include "otg_fsm.h"
29 #include "trace.h"
30
31 /* control endpoint description */
32 static const struct usb_endpoint_descriptor
33 ctrl_endpt_out_desc = {
34 .bLength = USB_DT_ENDPOINT_SIZE,
35 .bDescriptorType = USB_DT_ENDPOINT,
36
37 .bEndpointAddress = USB_DIR_OUT,
38 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
39 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
40 };
41
42 static const struct usb_endpoint_descriptor
43 ctrl_endpt_in_desc = {
44 .bLength = USB_DT_ENDPOINT_SIZE,
45 .bDescriptorType = USB_DT_ENDPOINT,
46
47 .bEndpointAddress = USB_DIR_IN,
48 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
49 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
50 };
51
52 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
53 struct td_node *node);
54 /**
55 * hw_ep_bit: calculates the bit number
56 * @num: endpoint number
57 * @dir: endpoint direction
58 *
59 * This function returns bit number
60 */
hw_ep_bit(int num,int dir)61 static inline int hw_ep_bit(int num, int dir)
62 {
63 return num + ((dir == TX) ? 16 : 0);
64 }
65
ep_to_bit(struct ci_hdrc * ci,int n)66 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
67 {
68 int fill = 16 - ci->hw_ep_max / 2;
69
70 if (n >= ci->hw_ep_max / 2)
71 n += fill;
72
73 return n;
74 }
75
76 /**
77 * hw_device_state: enables/disables interrupts (execute without interruption)
78 * @ci: the controller
79 * @dma: 0 => disable, !0 => enable and set dma engine
80 *
81 * This function returns an error code
82 */
hw_device_state(struct ci_hdrc * ci,u32 dma)83 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
84 {
85 if (dma) {
86 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
87 /* interrupt, error, port change, reset, sleep/suspend */
88 hw_write(ci, OP_USBINTR, ~0,
89 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
90 } else {
91 hw_write(ci, OP_USBINTR, ~0, 0);
92 }
93 return 0;
94 }
95
96 /**
97 * hw_ep_flush: flush endpoint fifo (execute without interruption)
98 * @ci: the controller
99 * @num: endpoint number
100 * @dir: endpoint direction
101 *
102 * This function returns an error code
103 */
hw_ep_flush(struct ci_hdrc * ci,int num,int dir)104 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
105 {
106 int n = hw_ep_bit(num, dir);
107
108 do {
109 /* flush any pending transfer */
110 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
111 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
112 cpu_relax();
113 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
114
115 return 0;
116 }
117
118 /**
119 * hw_ep_disable: disables endpoint (execute without interruption)
120 * @ci: the controller
121 * @num: endpoint number
122 * @dir: endpoint direction
123 *
124 * This function returns an error code
125 */
hw_ep_disable(struct ci_hdrc * ci,int num,int dir)126 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
127 {
128 hw_write(ci, OP_ENDPTCTRL + num,
129 (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
130 return 0;
131 }
132
133 /**
134 * hw_ep_enable: enables endpoint (execute without interruption)
135 * @ci: the controller
136 * @num: endpoint number
137 * @dir: endpoint direction
138 * @type: endpoint type
139 *
140 * This function returns an error code
141 */
hw_ep_enable(struct ci_hdrc * ci,int num,int dir,int type)142 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
143 {
144 u32 mask, data;
145
146 if (dir == TX) {
147 mask = ENDPTCTRL_TXT; /* type */
148 data = type << __ffs(mask);
149
150 mask |= ENDPTCTRL_TXS; /* unstall */
151 mask |= ENDPTCTRL_TXR; /* reset data toggle */
152 data |= ENDPTCTRL_TXR;
153 mask |= ENDPTCTRL_TXE; /* enable */
154 data |= ENDPTCTRL_TXE;
155 } else {
156 mask = ENDPTCTRL_RXT; /* type */
157 data = type << __ffs(mask);
158
159 mask |= ENDPTCTRL_RXS; /* unstall */
160 mask |= ENDPTCTRL_RXR; /* reset data toggle */
161 data |= ENDPTCTRL_RXR;
162 mask |= ENDPTCTRL_RXE; /* enable */
163 data |= ENDPTCTRL_RXE;
164 }
165 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
166 return 0;
167 }
168
169 /**
170 * hw_ep_get_halt: return endpoint halt status
171 * @ci: the controller
172 * @num: endpoint number
173 * @dir: endpoint direction
174 *
175 * This function returns 1 if endpoint halted
176 */
hw_ep_get_halt(struct ci_hdrc * ci,int num,int dir)177 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
178 {
179 u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
180
181 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
182 }
183
184 /**
185 * hw_ep_prime: primes endpoint (execute without interruption)
186 * @ci: the controller
187 * @num: endpoint number
188 * @dir: endpoint direction
189 * @is_ctrl: true if control endpoint
190 *
191 * This function returns an error code
192 */
hw_ep_prime(struct ci_hdrc * ci,int num,int dir,int is_ctrl)193 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
194 {
195 int n = hw_ep_bit(num, dir);
196
197 /* Synchronize before ep prime */
198 wmb();
199
200 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
201 return -EAGAIN;
202
203 hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
204
205 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
206 cpu_relax();
207 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
208 return -EAGAIN;
209
210 /* status shoult be tested according with manual but it doesn't work */
211 return 0;
212 }
213
214 /**
215 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
216 * without interruption)
217 * @ci: the controller
218 * @num: endpoint number
219 * @dir: endpoint direction
220 * @value: true => stall, false => unstall
221 *
222 * This function returns an error code
223 */
hw_ep_set_halt(struct ci_hdrc * ci,int num,int dir,int value)224 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
225 {
226 if (value != 0 && value != 1)
227 return -EINVAL;
228
229 do {
230 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
231 u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
232 u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
233
234 /* data toggle - reserved for EP0 but it's in ESS */
235 hw_write(ci, reg, mask_xs|mask_xr,
236 value ? mask_xs : mask_xr);
237 } while (value != hw_ep_get_halt(ci, num, dir));
238
239 return 0;
240 }
241
242 /**
243 * hw_port_is_high_speed: test if port is high speed
244 * @ci: the controller
245 *
246 * This function returns true if high speed port
247 */
hw_port_is_high_speed(struct ci_hdrc * ci)248 static int hw_port_is_high_speed(struct ci_hdrc *ci)
249 {
250 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
251 hw_read(ci, OP_PORTSC, PORTSC_HSP);
252 }
253
254 /**
255 * hw_test_and_clear_complete: test & clear complete status (execute without
256 * interruption)
257 * @ci: the controller
258 * @n: endpoint number
259 *
260 * This function returns complete status
261 */
hw_test_and_clear_complete(struct ci_hdrc * ci,int n)262 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
263 {
264 n = ep_to_bit(ci, n);
265 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
266 }
267
268 /**
269 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
270 * without interruption)
271 * @ci: the controller
272 *
273 * This function returns active interrutps
274 */
hw_test_and_clear_intr_active(struct ci_hdrc * ci)275 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
276 {
277 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
278
279 hw_write(ci, OP_USBSTS, ~0, reg);
280 return reg;
281 }
282
283 /**
284 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
285 * interruption)
286 * @ci: the controller
287 *
288 * This function returns guard value
289 */
hw_test_and_clear_setup_guard(struct ci_hdrc * ci)290 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
291 {
292 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
293 }
294
295 /**
296 * hw_test_and_set_setup_guard: test & set setup guard (execute without
297 * interruption)
298 * @ci: the controller
299 *
300 * This function returns guard value
301 */
hw_test_and_set_setup_guard(struct ci_hdrc * ci)302 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
303 {
304 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
305 }
306
307 /**
308 * hw_usb_set_address: configures USB address (execute without interruption)
309 * @ci: the controller
310 * @value: new USB address
311 *
312 * This function explicitly sets the address, without the "USBADRA" (advance)
313 * feature, which is not supported by older versions of the controller.
314 */
hw_usb_set_address(struct ci_hdrc * ci,u8 value)315 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
316 {
317 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
318 value << __ffs(DEVICEADDR_USBADR));
319 }
320
321 /**
322 * hw_usb_reset: restart device after a bus reset (execute without
323 * interruption)
324 * @ci: the controller
325 *
326 * This function returns an error code
327 */
hw_usb_reset(struct ci_hdrc * ci)328 static int hw_usb_reset(struct ci_hdrc *ci)
329 {
330 hw_usb_set_address(ci, 0);
331
332 /* ESS flushes only at end?!? */
333 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
334
335 /* clear setup token semaphores */
336 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
337
338 /* clear complete status */
339 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
340
341 /* wait until all bits cleared */
342 while (hw_read(ci, OP_ENDPTPRIME, ~0))
343 udelay(10); /* not RTOS friendly */
344
345 /* reset all endpoints ? */
346
347 /* reset internal status and wait for further instructions
348 no need to verify the port reset status (ESS does it) */
349
350 return 0;
351 }
352
353 /******************************************************************************
354 * UTIL block
355 *****************************************************************************/
356
add_td_to_list(struct ci_hw_ep * hwep,struct ci_hw_req * hwreq,unsigned int length,struct scatterlist * s)357 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
358 unsigned int length, struct scatterlist *s)
359 {
360 int i;
361 u32 temp;
362 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
363 GFP_ATOMIC);
364
365 if (node == NULL)
366 return -ENOMEM;
367
368 node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
369 if (node->ptr == NULL) {
370 kfree(node);
371 return -ENOMEM;
372 }
373
374 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
375 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
376 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
377 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
378 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
379
380 if (hwreq->req.length == 0
381 || hwreq->req.length % hwep->ep.maxpacket)
382 mul++;
383 node->ptr->token |= cpu_to_le32(mul << __ffs(TD_MULTO));
384 }
385
386 if (s) {
387 temp = (u32) (sg_dma_address(s) + hwreq->req.actual);
388 node->td_remaining_size = CI_MAX_BUF_SIZE - length;
389 } else {
390 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
391 }
392
393 if (length) {
394 node->ptr->page[0] = cpu_to_le32(temp);
395 for (i = 1; i < TD_PAGE_COUNT; i++) {
396 u32 page = temp + i * CI_HDRC_PAGE_SIZE;
397 page &= ~TD_RESERVED_MASK;
398 node->ptr->page[i] = cpu_to_le32(page);
399 }
400 }
401
402 hwreq->req.actual += length;
403
404 if (!list_empty(&hwreq->tds)) {
405 /* get the last entry */
406 lastnode = list_entry(hwreq->tds.prev,
407 struct td_node, td);
408 lastnode->ptr->next = cpu_to_le32(node->dma);
409 }
410
411 INIT_LIST_HEAD(&node->td);
412 list_add_tail(&node->td, &hwreq->tds);
413
414 return 0;
415 }
416
417 /**
418 * _usb_addr: calculates endpoint address from direction & number
419 * @ep: endpoint
420 */
_usb_addr(struct ci_hw_ep * ep)421 static inline u8 _usb_addr(struct ci_hw_ep *ep)
422 {
423 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
424 }
425
prepare_td_for_non_sg(struct ci_hw_ep * hwep,struct ci_hw_req * hwreq)426 static int prepare_td_for_non_sg(struct ci_hw_ep *hwep,
427 struct ci_hw_req *hwreq)
428 {
429 unsigned int rest = hwreq->req.length;
430 int pages = TD_PAGE_COUNT;
431 int ret = 0;
432
433 if (rest == 0) {
434 ret = add_td_to_list(hwep, hwreq, 0, NULL);
435 if (ret < 0)
436 return ret;
437 }
438
439 /*
440 * The first buffer could be not page aligned.
441 * In that case we have to span into one extra td.
442 */
443 if (hwreq->req.dma % PAGE_SIZE)
444 pages--;
445
446 while (rest > 0) {
447 unsigned int count = min(hwreq->req.length - hwreq->req.actual,
448 (unsigned int)(pages * CI_HDRC_PAGE_SIZE));
449
450 ret = add_td_to_list(hwep, hwreq, count, NULL);
451 if (ret < 0)
452 return ret;
453
454 rest -= count;
455 }
456
457 if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
458 && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
459 ret = add_td_to_list(hwep, hwreq, 0, NULL);
460 if (ret < 0)
461 return ret;
462 }
463
464 return ret;
465 }
466
prepare_td_per_sg(struct ci_hw_ep * hwep,struct ci_hw_req * hwreq,struct scatterlist * s)467 static int prepare_td_per_sg(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
468 struct scatterlist *s)
469 {
470 unsigned int rest = sg_dma_len(s);
471 int ret = 0;
472
473 hwreq->req.actual = 0;
474 while (rest > 0) {
475 unsigned int count = min_t(unsigned int, rest,
476 CI_MAX_BUF_SIZE);
477
478 ret = add_td_to_list(hwep, hwreq, count, s);
479 if (ret < 0)
480 return ret;
481
482 rest -= count;
483 }
484
485 return ret;
486 }
487
ci_add_buffer_entry(struct td_node * node,struct scatterlist * s)488 static void ci_add_buffer_entry(struct td_node *node, struct scatterlist *s)
489 {
490 int empty_td_slot_index = (CI_MAX_BUF_SIZE - node->td_remaining_size)
491 / CI_HDRC_PAGE_SIZE;
492 int i;
493 u32 token;
494
495 token = le32_to_cpu(node->ptr->token) + (sg_dma_len(s) << __ffs(TD_TOTAL_BYTES));
496 node->ptr->token = cpu_to_le32(token);
497
498 for (i = empty_td_slot_index; i < TD_PAGE_COUNT; i++) {
499 u32 page = (u32) sg_dma_address(s) +
500 (i - empty_td_slot_index) * CI_HDRC_PAGE_SIZE;
501
502 page &= ~TD_RESERVED_MASK;
503 node->ptr->page[i] = cpu_to_le32(page);
504 }
505 }
506
prepare_td_for_sg(struct ci_hw_ep * hwep,struct ci_hw_req * hwreq)507 static int prepare_td_for_sg(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
508 {
509 struct usb_request *req = &hwreq->req;
510 struct scatterlist *s = req->sg;
511 int ret = 0, i = 0;
512 struct td_node *node = NULL;
513
514 if (!s || req->zero || req->length == 0) {
515 dev_err(hwep->ci->dev, "not supported operation for sg\n");
516 return -EINVAL;
517 }
518
519 while (i++ < req->num_mapped_sgs) {
520 if (sg_dma_address(s) % PAGE_SIZE) {
521 dev_err(hwep->ci->dev, "not page aligned sg buffer\n");
522 return -EINVAL;
523 }
524
525 if (node && (node->td_remaining_size >= sg_dma_len(s))) {
526 ci_add_buffer_entry(node, s);
527 node->td_remaining_size -= sg_dma_len(s);
528 } else {
529 ret = prepare_td_per_sg(hwep, hwreq, s);
530 if (ret)
531 return ret;
532
533 node = list_entry(hwreq->tds.prev,
534 struct td_node, td);
535 }
536
537 s = sg_next(s);
538 }
539
540 return ret;
541 }
542
543 /**
544 * _hardware_enqueue: configures a request at hardware level
545 * @hwep: endpoint
546 * @hwreq: request
547 *
548 * This function returns an error code
549 */
_hardware_enqueue(struct ci_hw_ep * hwep,struct ci_hw_req * hwreq)550 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
551 {
552 struct ci_hdrc *ci = hwep->ci;
553 int ret = 0;
554 struct td_node *firstnode, *lastnode;
555
556 /* don't queue twice */
557 if (hwreq->req.status == -EALREADY)
558 return -EALREADY;
559
560 hwreq->req.status = -EALREADY;
561
562 ret = usb_gadget_map_request_by_dev(ci->dev->parent,
563 &hwreq->req, hwep->dir);
564 if (ret)
565 return ret;
566
567 if (hwreq->req.num_mapped_sgs)
568 ret = prepare_td_for_sg(hwep, hwreq);
569 else
570 ret = prepare_td_for_non_sg(hwep, hwreq);
571
572 if (ret)
573 return ret;
574
575 lastnode = list_entry(hwreq->tds.prev,
576 struct td_node, td);
577
578 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
579 if (!hwreq->req.no_interrupt)
580 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
581
582 list_for_each_entry_safe(firstnode, lastnode, &hwreq->tds, td)
583 trace_ci_prepare_td(hwep, hwreq, firstnode);
584
585 firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
586
587 wmb();
588
589 hwreq->req.actual = 0;
590 if (!list_empty(&hwep->qh.queue)) {
591 struct ci_hw_req *hwreqprev;
592 int n = hw_ep_bit(hwep->num, hwep->dir);
593 int tmp_stat;
594 struct td_node *prevlastnode;
595 u32 next = firstnode->dma & TD_ADDR_MASK;
596
597 hwreqprev = list_entry(hwep->qh.queue.prev,
598 struct ci_hw_req, queue);
599 prevlastnode = list_entry(hwreqprev->tds.prev,
600 struct td_node, td);
601
602 prevlastnode->ptr->next = cpu_to_le32(next);
603 wmb();
604
605 if (ci->rev == CI_REVISION_22) {
606 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
607 reprime_dtd(ci, hwep, prevlastnode);
608 }
609
610 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
611 goto done;
612 do {
613 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
614 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
615 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
616 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
617 if (tmp_stat)
618 goto done;
619 }
620
621 /* QH configuration */
622 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
623 hwep->qh.ptr->td.token &=
624 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
625
626 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
627 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
628
629 if (hwreq->req.length == 0
630 || hwreq->req.length % hwep->ep.maxpacket)
631 mul++;
632 hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
633 }
634
635 ret = hw_ep_prime(ci, hwep->num, hwep->dir,
636 hwep->type == USB_ENDPOINT_XFER_CONTROL);
637 done:
638 return ret;
639 }
640
641 /**
642 * free_pending_td: remove a pending request for the endpoint
643 * @hwep: endpoint
644 */
free_pending_td(struct ci_hw_ep * hwep)645 static void free_pending_td(struct ci_hw_ep *hwep)
646 {
647 struct td_node *pending = hwep->pending_td;
648
649 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
650 hwep->pending_td = NULL;
651 kfree(pending);
652 }
653
reprime_dtd(struct ci_hdrc * ci,struct ci_hw_ep * hwep,struct td_node * node)654 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
655 struct td_node *node)
656 {
657 hwep->qh.ptr->td.next = cpu_to_le32(node->dma);
658 hwep->qh.ptr->td.token &=
659 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
660
661 return hw_ep_prime(ci, hwep->num, hwep->dir,
662 hwep->type == USB_ENDPOINT_XFER_CONTROL);
663 }
664
665 /**
666 * _hardware_dequeue: handles a request at hardware level
667 * @hwep: endpoint
668 * @hwreq: request
669 *
670 * This function returns an error code
671 */
_hardware_dequeue(struct ci_hw_ep * hwep,struct ci_hw_req * hwreq)672 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
673 {
674 u32 tmptoken;
675 struct td_node *node, *tmpnode;
676 unsigned remaining_length;
677 unsigned actual = hwreq->req.length;
678 struct ci_hdrc *ci = hwep->ci;
679
680 if (hwreq->req.status != -EALREADY)
681 return -EINVAL;
682
683 hwreq->req.status = 0;
684
685 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
686 tmptoken = le32_to_cpu(node->ptr->token);
687 trace_ci_complete_td(hwep, hwreq, node);
688 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
689 int n = hw_ep_bit(hwep->num, hwep->dir);
690
691 if (ci->rev == CI_REVISION_24)
692 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
693 reprime_dtd(ci, hwep, node);
694 hwreq->req.status = -EALREADY;
695 return -EBUSY;
696 }
697
698 remaining_length = (tmptoken & TD_TOTAL_BYTES);
699 remaining_length >>= __ffs(TD_TOTAL_BYTES);
700 actual -= remaining_length;
701
702 hwreq->req.status = tmptoken & TD_STATUS;
703 if ((TD_STATUS_HALTED & hwreq->req.status)) {
704 hwreq->req.status = -EPIPE;
705 break;
706 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
707 hwreq->req.status = -EPROTO;
708 break;
709 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
710 hwreq->req.status = -EILSEQ;
711 break;
712 }
713
714 if (remaining_length) {
715 if (hwep->dir == TX) {
716 hwreq->req.status = -EPROTO;
717 break;
718 }
719 }
720 /*
721 * As the hardware could still address the freed td
722 * which will run the udc unusable, the cleanup of the
723 * td has to be delayed by one.
724 */
725 if (hwep->pending_td)
726 free_pending_td(hwep);
727
728 hwep->pending_td = node;
729 list_del_init(&node->td);
730 }
731
732 usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
733 &hwreq->req, hwep->dir);
734
735 hwreq->req.actual += actual;
736
737 if (hwreq->req.status)
738 return hwreq->req.status;
739
740 return hwreq->req.actual;
741 }
742
743 /**
744 * _ep_nuke: dequeues all endpoint requests
745 * @hwep: endpoint
746 *
747 * This function returns an error code
748 * Caller must hold lock
749 */
_ep_nuke(struct ci_hw_ep * hwep)750 static int _ep_nuke(struct ci_hw_ep *hwep)
751 __releases(hwep->lock)
752 __acquires(hwep->lock)
753 {
754 struct td_node *node, *tmpnode;
755 if (hwep == NULL)
756 return -EINVAL;
757
758 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
759
760 while (!list_empty(&hwep->qh.queue)) {
761
762 /* pop oldest request */
763 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
764 struct ci_hw_req, queue);
765
766 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
767 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
768 list_del_init(&node->td);
769 node->ptr = NULL;
770 kfree(node);
771 }
772
773 list_del_init(&hwreq->queue);
774 hwreq->req.status = -ESHUTDOWN;
775
776 if (hwreq->req.complete != NULL) {
777 spin_unlock(hwep->lock);
778 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
779 spin_lock(hwep->lock);
780 }
781 }
782
783 if (hwep->pending_td)
784 free_pending_td(hwep);
785
786 return 0;
787 }
788
_ep_set_halt(struct usb_ep * ep,int value,bool check_transfer)789 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
790 {
791 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
792 int direction, retval = 0;
793 unsigned long flags;
794
795 if (ep == NULL || hwep->ep.desc == NULL)
796 return -EINVAL;
797
798 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
799 return -EOPNOTSUPP;
800
801 spin_lock_irqsave(hwep->lock, flags);
802
803 if (value && hwep->dir == TX && check_transfer &&
804 !list_empty(&hwep->qh.queue) &&
805 !usb_endpoint_xfer_control(hwep->ep.desc)) {
806 spin_unlock_irqrestore(hwep->lock, flags);
807 return -EAGAIN;
808 }
809
810 direction = hwep->dir;
811 do {
812 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
813
814 if (!value)
815 hwep->wedge = 0;
816
817 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
818 hwep->dir = (hwep->dir == TX) ? RX : TX;
819
820 } while (hwep->dir != direction);
821
822 spin_unlock_irqrestore(hwep->lock, flags);
823 return retval;
824 }
825
826
827 /**
828 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
829 * @gadget: gadget
830 *
831 * This function returns an error code
832 */
_gadget_stop_activity(struct usb_gadget * gadget)833 static int _gadget_stop_activity(struct usb_gadget *gadget)
834 {
835 struct usb_ep *ep;
836 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
837 unsigned long flags;
838
839 /* flush all endpoints */
840 gadget_for_each_ep(ep, gadget) {
841 usb_ep_fifo_flush(ep);
842 }
843 usb_ep_fifo_flush(&ci->ep0out->ep);
844 usb_ep_fifo_flush(&ci->ep0in->ep);
845
846 /* make sure to disable all endpoints */
847 gadget_for_each_ep(ep, gadget) {
848 usb_ep_disable(ep);
849 }
850
851 if (ci->status != NULL) {
852 usb_ep_free_request(&ci->ep0in->ep, ci->status);
853 ci->status = NULL;
854 }
855
856 spin_lock_irqsave(&ci->lock, flags);
857 ci->gadget.speed = USB_SPEED_UNKNOWN;
858 ci->remote_wakeup = 0;
859 ci->suspended = 0;
860 spin_unlock_irqrestore(&ci->lock, flags);
861
862 return 0;
863 }
864
865 /******************************************************************************
866 * ISR block
867 *****************************************************************************/
868 /**
869 * isr_reset_handler: USB reset interrupt handler
870 * @ci: UDC device
871 *
872 * This function resets USB engine after a bus reset occurred
873 */
isr_reset_handler(struct ci_hdrc * ci)874 static void isr_reset_handler(struct ci_hdrc *ci)
875 __releases(ci->lock)
876 __acquires(ci->lock)
877 {
878 int retval;
879
880 spin_unlock(&ci->lock);
881 if (ci->gadget.speed != USB_SPEED_UNKNOWN)
882 usb_gadget_udc_reset(&ci->gadget, ci->driver);
883
884 retval = _gadget_stop_activity(&ci->gadget);
885 if (retval)
886 goto done;
887
888 retval = hw_usb_reset(ci);
889 if (retval)
890 goto done;
891
892 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
893 if (ci->status == NULL)
894 retval = -ENOMEM;
895
896 done:
897 spin_lock(&ci->lock);
898
899 if (retval)
900 dev_err(ci->dev, "error: %i\n", retval);
901 }
902
903 /**
904 * isr_get_status_complete: get_status request complete function
905 * @ep: endpoint
906 * @req: request handled
907 *
908 * Caller must release lock
909 */
isr_get_status_complete(struct usb_ep * ep,struct usb_request * req)910 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
911 {
912 if (ep == NULL || req == NULL)
913 return;
914
915 kfree(req->buf);
916 usb_ep_free_request(ep, req);
917 }
918
919 /**
920 * _ep_queue: queues (submits) an I/O request to an endpoint
921 * @ep: endpoint
922 * @req: request
923 * @gfp_flags: GFP flags (not used)
924 *
925 * Caller must hold lock
926 * This function returns an error code
927 */
_ep_queue(struct usb_ep * ep,struct usb_request * req,gfp_t __maybe_unused gfp_flags)928 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
929 gfp_t __maybe_unused gfp_flags)
930 {
931 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
932 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
933 struct ci_hdrc *ci = hwep->ci;
934 int retval = 0;
935
936 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
937 return -EINVAL;
938
939 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
940 if (req->length)
941 hwep = (ci->ep0_dir == RX) ?
942 ci->ep0out : ci->ep0in;
943 if (!list_empty(&hwep->qh.queue)) {
944 _ep_nuke(hwep);
945 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
946 _usb_addr(hwep));
947 }
948 }
949
950 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
951 hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
952 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
953 return -EMSGSIZE;
954 }
955
956 /* first nuke then test link, e.g. previous status has not sent */
957 if (!list_empty(&hwreq->queue)) {
958 dev_err(hwep->ci->dev, "request already in queue\n");
959 return -EBUSY;
960 }
961
962 /* push request */
963 hwreq->req.status = -EINPROGRESS;
964 hwreq->req.actual = 0;
965
966 retval = _hardware_enqueue(hwep, hwreq);
967
968 if (retval == -EALREADY)
969 retval = 0;
970 if (!retval)
971 list_add_tail(&hwreq->queue, &hwep->qh.queue);
972
973 return retval;
974 }
975
976 /**
977 * isr_get_status_response: get_status request response
978 * @ci: ci struct
979 * @setup: setup request packet
980 *
981 * This function returns an error code
982 */
isr_get_status_response(struct ci_hdrc * ci,struct usb_ctrlrequest * setup)983 static int isr_get_status_response(struct ci_hdrc *ci,
984 struct usb_ctrlrequest *setup)
985 __releases(hwep->lock)
986 __acquires(hwep->lock)
987 {
988 struct ci_hw_ep *hwep = ci->ep0in;
989 struct usb_request *req = NULL;
990 gfp_t gfp_flags = GFP_ATOMIC;
991 int dir, num, retval;
992
993 if (hwep == NULL || setup == NULL)
994 return -EINVAL;
995
996 spin_unlock(hwep->lock);
997 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
998 spin_lock(hwep->lock);
999 if (req == NULL)
1000 return -ENOMEM;
1001
1002 req->complete = isr_get_status_complete;
1003 req->length = 2;
1004 req->buf = kzalloc(req->length, gfp_flags);
1005 if (req->buf == NULL) {
1006 retval = -ENOMEM;
1007 goto err_free_req;
1008 }
1009
1010 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
1011 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
1012 ci->gadget.is_selfpowered;
1013 } else if ((setup->bRequestType & USB_RECIP_MASK) \
1014 == USB_RECIP_ENDPOINT) {
1015 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
1016 TX : RX;
1017 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
1018 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
1019 }
1020 /* else do nothing; reserved for future use */
1021
1022 retval = _ep_queue(&hwep->ep, req, gfp_flags);
1023 if (retval)
1024 goto err_free_buf;
1025
1026 return 0;
1027
1028 err_free_buf:
1029 kfree(req->buf);
1030 err_free_req:
1031 spin_unlock(hwep->lock);
1032 usb_ep_free_request(&hwep->ep, req);
1033 spin_lock(hwep->lock);
1034 return retval;
1035 }
1036
1037 /**
1038 * isr_setup_status_complete: setup_status request complete function
1039 * @ep: endpoint
1040 * @req: request handled
1041 *
1042 * Caller must release lock. Put the port in test mode if test mode
1043 * feature is selected.
1044 */
1045 static void
isr_setup_status_complete(struct usb_ep * ep,struct usb_request * req)1046 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
1047 {
1048 struct ci_hdrc *ci = req->context;
1049 unsigned long flags;
1050
1051 if (req->status < 0)
1052 return;
1053
1054 if (ci->setaddr) {
1055 hw_usb_set_address(ci, ci->address);
1056 ci->setaddr = false;
1057 if (ci->address)
1058 usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
1059 }
1060
1061 spin_lock_irqsave(&ci->lock, flags);
1062 if (ci->test_mode)
1063 hw_port_test_set(ci, ci->test_mode);
1064 spin_unlock_irqrestore(&ci->lock, flags);
1065 }
1066
1067 /**
1068 * isr_setup_status_phase: queues the status phase of a setup transation
1069 * @ci: ci struct
1070 *
1071 * This function returns an error code
1072 */
isr_setup_status_phase(struct ci_hdrc * ci)1073 static int isr_setup_status_phase(struct ci_hdrc *ci)
1074 {
1075 struct ci_hw_ep *hwep;
1076
1077 /*
1078 * Unexpected USB controller behavior, caused by bad signal integrity
1079 * or ground reference problems, can lead to isr_setup_status_phase
1080 * being called with ci->status equal to NULL.
1081 * If this situation occurs, you should review your USB hardware design.
1082 */
1083 if (WARN_ON_ONCE(!ci->status))
1084 return -EPIPE;
1085
1086 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
1087 ci->status->context = ci;
1088 ci->status->complete = isr_setup_status_complete;
1089
1090 return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
1091 }
1092
1093 /**
1094 * isr_tr_complete_low: transaction complete low level handler
1095 * @hwep: endpoint
1096 *
1097 * This function returns an error code
1098 * Caller must hold lock
1099 */
isr_tr_complete_low(struct ci_hw_ep * hwep)1100 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
1101 __releases(hwep->lock)
1102 __acquires(hwep->lock)
1103 {
1104 struct ci_hw_req *hwreq, *hwreqtemp;
1105 struct ci_hw_ep *hweptemp = hwep;
1106 int retval = 0;
1107
1108 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
1109 queue) {
1110 retval = _hardware_dequeue(hwep, hwreq);
1111 if (retval < 0)
1112 break;
1113 list_del_init(&hwreq->queue);
1114 if (hwreq->req.complete != NULL) {
1115 spin_unlock(hwep->lock);
1116 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
1117 hwreq->req.length)
1118 hweptemp = hwep->ci->ep0in;
1119 usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
1120 spin_lock(hwep->lock);
1121 }
1122 }
1123
1124 if (retval == -EBUSY)
1125 retval = 0;
1126
1127 return retval;
1128 }
1129
otg_a_alt_hnp_support(struct ci_hdrc * ci)1130 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1131 {
1132 dev_warn(&ci->gadget.dev,
1133 "connect the device to an alternate port if you want HNP\n");
1134 return isr_setup_status_phase(ci);
1135 }
1136
1137 /**
1138 * isr_setup_packet_handler: setup packet handler
1139 * @ci: UDC descriptor
1140 *
1141 * This function handles setup packet
1142 */
isr_setup_packet_handler(struct ci_hdrc * ci)1143 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1144 __releases(ci->lock)
1145 __acquires(ci->lock)
1146 {
1147 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1148 struct usb_ctrlrequest req;
1149 int type, num, dir, err = -EINVAL;
1150 u8 tmode = 0;
1151
1152 /*
1153 * Flush data and handshake transactions of previous
1154 * setup packet.
1155 */
1156 _ep_nuke(ci->ep0out);
1157 _ep_nuke(ci->ep0in);
1158
1159 /* read_setup_packet */
1160 do {
1161 hw_test_and_set_setup_guard(ci);
1162 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1163 } while (!hw_test_and_clear_setup_guard(ci));
1164
1165 type = req.bRequestType;
1166
1167 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1168
1169 switch (req.bRequest) {
1170 case USB_REQ_CLEAR_FEATURE:
1171 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1172 le16_to_cpu(req.wValue) ==
1173 USB_ENDPOINT_HALT) {
1174 if (req.wLength != 0)
1175 break;
1176 num = le16_to_cpu(req.wIndex);
1177 dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1178 num &= USB_ENDPOINT_NUMBER_MASK;
1179 if (dir == TX)
1180 num += ci->hw_ep_max / 2;
1181 if (!ci->ci_hw_ep[num].wedge) {
1182 spin_unlock(&ci->lock);
1183 err = usb_ep_clear_halt(
1184 &ci->ci_hw_ep[num].ep);
1185 spin_lock(&ci->lock);
1186 if (err)
1187 break;
1188 }
1189 err = isr_setup_status_phase(ci);
1190 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1191 le16_to_cpu(req.wValue) ==
1192 USB_DEVICE_REMOTE_WAKEUP) {
1193 if (req.wLength != 0)
1194 break;
1195 ci->remote_wakeup = 0;
1196 err = isr_setup_status_phase(ci);
1197 } else {
1198 goto delegate;
1199 }
1200 break;
1201 case USB_REQ_GET_STATUS:
1202 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1203 le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1204 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1205 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1206 goto delegate;
1207 if (le16_to_cpu(req.wLength) != 2 ||
1208 le16_to_cpu(req.wValue) != 0)
1209 break;
1210 err = isr_get_status_response(ci, &req);
1211 break;
1212 case USB_REQ_SET_ADDRESS:
1213 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1214 goto delegate;
1215 if (le16_to_cpu(req.wLength) != 0 ||
1216 le16_to_cpu(req.wIndex) != 0)
1217 break;
1218 ci->address = (u8)le16_to_cpu(req.wValue);
1219 ci->setaddr = true;
1220 err = isr_setup_status_phase(ci);
1221 break;
1222 case USB_REQ_SET_FEATURE:
1223 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1224 le16_to_cpu(req.wValue) ==
1225 USB_ENDPOINT_HALT) {
1226 if (req.wLength != 0)
1227 break;
1228 num = le16_to_cpu(req.wIndex);
1229 dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1230 num &= USB_ENDPOINT_NUMBER_MASK;
1231 if (dir == TX)
1232 num += ci->hw_ep_max / 2;
1233
1234 spin_unlock(&ci->lock);
1235 err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1236 spin_lock(&ci->lock);
1237 if (!err)
1238 isr_setup_status_phase(ci);
1239 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1240 if (req.wLength != 0)
1241 break;
1242 switch (le16_to_cpu(req.wValue)) {
1243 case USB_DEVICE_REMOTE_WAKEUP:
1244 ci->remote_wakeup = 1;
1245 err = isr_setup_status_phase(ci);
1246 break;
1247 case USB_DEVICE_TEST_MODE:
1248 tmode = le16_to_cpu(req.wIndex) >> 8;
1249 switch (tmode) {
1250 case USB_TEST_J:
1251 case USB_TEST_K:
1252 case USB_TEST_SE0_NAK:
1253 case USB_TEST_PACKET:
1254 case USB_TEST_FORCE_ENABLE:
1255 ci->test_mode = tmode;
1256 err = isr_setup_status_phase(
1257 ci);
1258 break;
1259 default:
1260 break;
1261 }
1262 break;
1263 case USB_DEVICE_B_HNP_ENABLE:
1264 if (ci_otg_is_fsm_mode(ci)) {
1265 ci->gadget.b_hnp_enable = 1;
1266 err = isr_setup_status_phase(
1267 ci);
1268 }
1269 break;
1270 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1271 if (ci_otg_is_fsm_mode(ci))
1272 err = otg_a_alt_hnp_support(ci);
1273 break;
1274 case USB_DEVICE_A_HNP_SUPPORT:
1275 if (ci_otg_is_fsm_mode(ci)) {
1276 ci->gadget.a_hnp_support = 1;
1277 err = isr_setup_status_phase(
1278 ci);
1279 }
1280 break;
1281 default:
1282 goto delegate;
1283 }
1284 } else {
1285 goto delegate;
1286 }
1287 break;
1288 default:
1289 delegate:
1290 if (req.wLength == 0) /* no data phase */
1291 ci->ep0_dir = TX;
1292
1293 spin_unlock(&ci->lock);
1294 err = ci->driver->setup(&ci->gadget, &req);
1295 spin_lock(&ci->lock);
1296 break;
1297 }
1298
1299 if (err < 0) {
1300 spin_unlock(&ci->lock);
1301 if (_ep_set_halt(&hwep->ep, 1, false))
1302 dev_err(ci->dev, "error: _ep_set_halt\n");
1303 spin_lock(&ci->lock);
1304 }
1305 }
1306
1307 /**
1308 * isr_tr_complete_handler: transaction complete interrupt handler
1309 * @ci: UDC descriptor
1310 *
1311 * This function handles traffic events
1312 */
isr_tr_complete_handler(struct ci_hdrc * ci)1313 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1314 __releases(ci->lock)
1315 __acquires(ci->lock)
1316 {
1317 unsigned i;
1318 int err;
1319
1320 for (i = 0; i < ci->hw_ep_max; i++) {
1321 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1322
1323 if (hwep->ep.desc == NULL)
1324 continue; /* not configured */
1325
1326 if (hw_test_and_clear_complete(ci, i)) {
1327 err = isr_tr_complete_low(hwep);
1328 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1329 if (err > 0) /* needs status phase */
1330 err = isr_setup_status_phase(ci);
1331 if (err < 0) {
1332 spin_unlock(&ci->lock);
1333 if (_ep_set_halt(&hwep->ep, 1, false))
1334 dev_err(ci->dev,
1335 "error: _ep_set_halt\n");
1336 spin_lock(&ci->lock);
1337 }
1338 }
1339 }
1340
1341 /* Only handle setup packet below */
1342 if (i == 0 &&
1343 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1344 isr_setup_packet_handler(ci);
1345 }
1346 }
1347
1348 /******************************************************************************
1349 * ENDPT block
1350 *****************************************************************************/
1351 /*
1352 * ep_enable: configure endpoint, making it usable
1353 *
1354 * Check usb_ep_enable() at "usb_gadget.h" for details
1355 */
ep_enable(struct usb_ep * ep,const struct usb_endpoint_descriptor * desc)1356 static int ep_enable(struct usb_ep *ep,
1357 const struct usb_endpoint_descriptor *desc)
1358 {
1359 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1360 int retval = 0;
1361 unsigned long flags;
1362 u32 cap = 0;
1363
1364 if (ep == NULL || desc == NULL)
1365 return -EINVAL;
1366
1367 spin_lock_irqsave(hwep->lock, flags);
1368
1369 /* only internal SW should enable ctrl endpts */
1370
1371 if (!list_empty(&hwep->qh.queue)) {
1372 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1373 spin_unlock_irqrestore(hwep->lock, flags);
1374 return -EBUSY;
1375 }
1376
1377 hwep->ep.desc = desc;
1378
1379 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1380 hwep->num = usb_endpoint_num(desc);
1381 hwep->type = usb_endpoint_type(desc);
1382
1383 hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1384 hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1385
1386 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1387 cap |= QH_IOS;
1388
1389 cap |= QH_ZLT;
1390 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1391 /*
1392 * For ISO-TX, we set mult at QH as the largest value, and use
1393 * MultO at TD as real mult value.
1394 */
1395 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1396 cap |= 3 << __ffs(QH_MULT);
1397
1398 hwep->qh.ptr->cap = cpu_to_le32(cap);
1399
1400 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1401
1402 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1403 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1404 retval = -EINVAL;
1405 }
1406
1407 /*
1408 * Enable endpoints in the HW other than ep0 as ep0
1409 * is always enabled
1410 */
1411 if (hwep->num)
1412 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1413 hwep->type);
1414
1415 spin_unlock_irqrestore(hwep->lock, flags);
1416 return retval;
1417 }
1418
1419 /*
1420 * ep_disable: endpoint is no longer usable
1421 *
1422 * Check usb_ep_disable() at "usb_gadget.h" for details
1423 */
ep_disable(struct usb_ep * ep)1424 static int ep_disable(struct usb_ep *ep)
1425 {
1426 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1427 int direction, retval = 0;
1428 unsigned long flags;
1429
1430 if (ep == NULL)
1431 return -EINVAL;
1432 else if (hwep->ep.desc == NULL)
1433 return -EBUSY;
1434
1435 spin_lock_irqsave(hwep->lock, flags);
1436 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1437 spin_unlock_irqrestore(hwep->lock, flags);
1438 return 0;
1439 }
1440
1441 /* only internal SW should disable ctrl endpts */
1442
1443 direction = hwep->dir;
1444 do {
1445 retval |= _ep_nuke(hwep);
1446 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1447
1448 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1449 hwep->dir = (hwep->dir == TX) ? RX : TX;
1450
1451 } while (hwep->dir != direction);
1452
1453 hwep->ep.desc = NULL;
1454
1455 spin_unlock_irqrestore(hwep->lock, flags);
1456 return retval;
1457 }
1458
1459 /*
1460 * ep_alloc_request: allocate a request object to use with this endpoint
1461 *
1462 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1463 */
ep_alloc_request(struct usb_ep * ep,gfp_t gfp_flags)1464 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1465 {
1466 struct ci_hw_req *hwreq = NULL;
1467
1468 if (ep == NULL)
1469 return NULL;
1470
1471 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1472 if (hwreq != NULL) {
1473 INIT_LIST_HEAD(&hwreq->queue);
1474 INIT_LIST_HEAD(&hwreq->tds);
1475 }
1476
1477 return (hwreq == NULL) ? NULL : &hwreq->req;
1478 }
1479
1480 /*
1481 * ep_free_request: frees a request object
1482 *
1483 * Check usb_ep_free_request() at "usb_gadget.h" for details
1484 */
ep_free_request(struct usb_ep * ep,struct usb_request * req)1485 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1486 {
1487 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1488 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1489 struct td_node *node, *tmpnode;
1490 unsigned long flags;
1491
1492 if (ep == NULL || req == NULL) {
1493 return;
1494 } else if (!list_empty(&hwreq->queue)) {
1495 dev_err(hwep->ci->dev, "freeing queued request\n");
1496 return;
1497 }
1498
1499 spin_lock_irqsave(hwep->lock, flags);
1500
1501 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1502 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1503 list_del_init(&node->td);
1504 node->ptr = NULL;
1505 kfree(node);
1506 }
1507
1508 kfree(hwreq);
1509
1510 spin_unlock_irqrestore(hwep->lock, flags);
1511 }
1512
1513 /*
1514 * ep_queue: queues (submits) an I/O request to an endpoint
1515 *
1516 * Check usb_ep_queue()* at usb_gadget.h" for details
1517 */
ep_queue(struct usb_ep * ep,struct usb_request * req,gfp_t __maybe_unused gfp_flags)1518 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1519 gfp_t __maybe_unused gfp_flags)
1520 {
1521 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1522 int retval = 0;
1523 unsigned long flags;
1524
1525 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1526 return -EINVAL;
1527
1528 spin_lock_irqsave(hwep->lock, flags);
1529 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1530 spin_unlock_irqrestore(hwep->lock, flags);
1531 return 0;
1532 }
1533 retval = _ep_queue(ep, req, gfp_flags);
1534 spin_unlock_irqrestore(hwep->lock, flags);
1535 return retval;
1536 }
1537
1538 /*
1539 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1540 *
1541 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1542 */
ep_dequeue(struct usb_ep * ep,struct usb_request * req)1543 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1544 {
1545 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1546 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1547 unsigned long flags;
1548 struct td_node *node, *tmpnode;
1549
1550 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1551 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1552 list_empty(&hwep->qh.queue))
1553 return -EINVAL;
1554
1555 spin_lock_irqsave(hwep->lock, flags);
1556 if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
1557 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1558
1559 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1560 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1561 list_del(&node->td);
1562 kfree(node);
1563 }
1564
1565 /* pop request */
1566 list_del_init(&hwreq->queue);
1567
1568 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1569
1570 req->status = -ECONNRESET;
1571
1572 if (hwreq->req.complete != NULL) {
1573 spin_unlock(hwep->lock);
1574 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1575 spin_lock(hwep->lock);
1576 }
1577
1578 spin_unlock_irqrestore(hwep->lock, flags);
1579 return 0;
1580 }
1581
1582 /*
1583 * ep_set_halt: sets the endpoint halt feature
1584 *
1585 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1586 */
ep_set_halt(struct usb_ep * ep,int value)1587 static int ep_set_halt(struct usb_ep *ep, int value)
1588 {
1589 return _ep_set_halt(ep, value, true);
1590 }
1591
1592 /*
1593 * ep_set_wedge: sets the halt feature and ignores clear requests
1594 *
1595 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1596 */
ep_set_wedge(struct usb_ep * ep)1597 static int ep_set_wedge(struct usb_ep *ep)
1598 {
1599 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1600 unsigned long flags;
1601
1602 if (ep == NULL || hwep->ep.desc == NULL)
1603 return -EINVAL;
1604
1605 spin_lock_irqsave(hwep->lock, flags);
1606 hwep->wedge = 1;
1607 spin_unlock_irqrestore(hwep->lock, flags);
1608
1609 return usb_ep_set_halt(ep);
1610 }
1611
1612 /*
1613 * ep_fifo_flush: flushes contents of a fifo
1614 *
1615 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1616 */
ep_fifo_flush(struct usb_ep * ep)1617 static void ep_fifo_flush(struct usb_ep *ep)
1618 {
1619 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1620 unsigned long flags;
1621
1622 if (ep == NULL) {
1623 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1624 return;
1625 }
1626
1627 spin_lock_irqsave(hwep->lock, flags);
1628 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1629 spin_unlock_irqrestore(hwep->lock, flags);
1630 return;
1631 }
1632
1633 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1634
1635 spin_unlock_irqrestore(hwep->lock, flags);
1636 }
1637
1638 /*
1639 * Endpoint-specific part of the API to the USB controller hardware
1640 * Check "usb_gadget.h" for details
1641 */
1642 static const struct usb_ep_ops usb_ep_ops = {
1643 .enable = ep_enable,
1644 .disable = ep_disable,
1645 .alloc_request = ep_alloc_request,
1646 .free_request = ep_free_request,
1647 .queue = ep_queue,
1648 .dequeue = ep_dequeue,
1649 .set_halt = ep_set_halt,
1650 .set_wedge = ep_set_wedge,
1651 .fifo_flush = ep_fifo_flush,
1652 };
1653
1654 /******************************************************************************
1655 * GADGET block
1656 *****************************************************************************/
1657
ci_udc_get_frame(struct usb_gadget * _gadget)1658 static int ci_udc_get_frame(struct usb_gadget *_gadget)
1659 {
1660 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1661 unsigned long flags;
1662 int ret;
1663
1664 spin_lock_irqsave(&ci->lock, flags);
1665 ret = hw_read(ci, OP_FRINDEX, 0x3fff);
1666 spin_unlock_irqrestore(&ci->lock, flags);
1667 return ret >> 3;
1668 }
1669
1670 /*
1671 * ci_hdrc_gadget_connect: caller makes sure gadget driver is binded
1672 */
ci_hdrc_gadget_connect(struct usb_gadget * _gadget,int is_active)1673 static void ci_hdrc_gadget_connect(struct usb_gadget *_gadget, int is_active)
1674 {
1675 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1676
1677 if (is_active) {
1678 pm_runtime_get_sync(ci->dev);
1679 hw_device_reset(ci);
1680 spin_lock_irq(&ci->lock);
1681 if (ci->driver) {
1682 hw_device_state(ci, ci->ep0out->qh.dma);
1683 usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1684 spin_unlock_irq(&ci->lock);
1685 usb_udc_vbus_handler(_gadget, true);
1686 } else {
1687 spin_unlock_irq(&ci->lock);
1688 }
1689 } else {
1690 usb_udc_vbus_handler(_gadget, false);
1691 if (ci->driver)
1692 ci->driver->disconnect(&ci->gadget);
1693 hw_device_state(ci, 0);
1694 if (ci->platdata->notify_event)
1695 ci->platdata->notify_event(ci,
1696 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1697 _gadget_stop_activity(&ci->gadget);
1698 pm_runtime_put_sync(ci->dev);
1699 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1700 }
1701 }
1702
ci_udc_vbus_session(struct usb_gadget * _gadget,int is_active)1703 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1704 {
1705 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1706 unsigned long flags;
1707 int ret = 0;
1708
1709 spin_lock_irqsave(&ci->lock, flags);
1710 ci->vbus_active = is_active;
1711 spin_unlock_irqrestore(&ci->lock, flags);
1712
1713 if (ci->usb_phy)
1714 usb_phy_set_charger_state(ci->usb_phy, is_active ?
1715 USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1716
1717 if (ci->platdata->notify_event)
1718 ret = ci->platdata->notify_event(ci,
1719 CI_HDRC_CONTROLLER_VBUS_EVENT);
1720
1721 if (ci->driver)
1722 ci_hdrc_gadget_connect(_gadget, is_active);
1723
1724 return ret;
1725 }
1726
ci_udc_wakeup(struct usb_gadget * _gadget)1727 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1728 {
1729 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1730 unsigned long flags;
1731 int ret = 0;
1732
1733 spin_lock_irqsave(&ci->lock, flags);
1734 if (ci->gadget.speed == USB_SPEED_UNKNOWN) {
1735 spin_unlock_irqrestore(&ci->lock, flags);
1736 return 0;
1737 }
1738 if (!ci->remote_wakeup) {
1739 ret = -EOPNOTSUPP;
1740 goto out;
1741 }
1742 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1743 ret = -EINVAL;
1744 goto out;
1745 }
1746 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1747 out:
1748 spin_unlock_irqrestore(&ci->lock, flags);
1749 return ret;
1750 }
1751
ci_udc_vbus_draw(struct usb_gadget * _gadget,unsigned ma)1752 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1753 {
1754 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1755
1756 if (ci->usb_phy)
1757 return usb_phy_set_power(ci->usb_phy, ma);
1758 return -ENOTSUPP;
1759 }
1760
ci_udc_selfpowered(struct usb_gadget * _gadget,int is_on)1761 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1762 {
1763 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1764 struct ci_hw_ep *hwep = ci->ep0in;
1765 unsigned long flags;
1766
1767 spin_lock_irqsave(hwep->lock, flags);
1768 _gadget->is_selfpowered = (is_on != 0);
1769 spin_unlock_irqrestore(hwep->lock, flags);
1770
1771 return 0;
1772 }
1773
1774 /* Change Data+ pullup status
1775 * this func is used by usb_gadget_connect/disconnect
1776 */
ci_udc_pullup(struct usb_gadget * _gadget,int is_on)1777 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1778 {
1779 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1780
1781 /*
1782 * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1783 * and don't touch Data+ in host mode for dual role config.
1784 */
1785 if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1786 return 0;
1787
1788 pm_runtime_get_sync(ci->dev);
1789 if (is_on)
1790 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1791 else
1792 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1793 pm_runtime_put_sync(ci->dev);
1794
1795 return 0;
1796 }
1797
1798 static int ci_udc_start(struct usb_gadget *gadget,
1799 struct usb_gadget_driver *driver);
1800 static int ci_udc_stop(struct usb_gadget *gadget);
1801
1802 /* Match ISOC IN from the highest endpoint */
ci_udc_match_ep(struct usb_gadget * gadget,struct usb_endpoint_descriptor * desc,struct usb_ss_ep_comp_descriptor * comp_desc)1803 static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget,
1804 struct usb_endpoint_descriptor *desc,
1805 struct usb_ss_ep_comp_descriptor *comp_desc)
1806 {
1807 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1808 struct usb_ep *ep;
1809
1810 if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) {
1811 list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) {
1812 if (ep->caps.dir_in && !ep->claimed)
1813 return ep;
1814 }
1815 }
1816
1817 return NULL;
1818 }
1819
1820 /*
1821 * Device operations part of the API to the USB controller hardware,
1822 * which don't involve endpoints (or i/o)
1823 * Check "usb_gadget.h" for details
1824 */
1825 static const struct usb_gadget_ops usb_gadget_ops = {
1826 .get_frame = ci_udc_get_frame,
1827 .vbus_session = ci_udc_vbus_session,
1828 .wakeup = ci_udc_wakeup,
1829 .set_selfpowered = ci_udc_selfpowered,
1830 .pullup = ci_udc_pullup,
1831 .vbus_draw = ci_udc_vbus_draw,
1832 .udc_start = ci_udc_start,
1833 .udc_stop = ci_udc_stop,
1834 .match_ep = ci_udc_match_ep,
1835 };
1836
init_eps(struct ci_hdrc * ci)1837 static int init_eps(struct ci_hdrc *ci)
1838 {
1839 int retval = 0, i, j;
1840
1841 for (i = 0; i < ci->hw_ep_max/2; i++)
1842 for (j = RX; j <= TX; j++) {
1843 int k = i + j * ci->hw_ep_max/2;
1844 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1845
1846 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1847 (j == TX) ? "in" : "out");
1848
1849 hwep->ci = ci;
1850 hwep->lock = &ci->lock;
1851 hwep->td_pool = ci->td_pool;
1852
1853 hwep->ep.name = hwep->name;
1854 hwep->ep.ops = &usb_ep_ops;
1855
1856 if (i == 0) {
1857 hwep->ep.caps.type_control = true;
1858 } else {
1859 hwep->ep.caps.type_iso = true;
1860 hwep->ep.caps.type_bulk = true;
1861 hwep->ep.caps.type_int = true;
1862 }
1863
1864 if (j == TX)
1865 hwep->ep.caps.dir_in = true;
1866 else
1867 hwep->ep.caps.dir_out = true;
1868
1869 /*
1870 * for ep0: maxP defined in desc, for other
1871 * eps, maxP is set by epautoconfig() called
1872 * by gadget layer
1873 */
1874 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1875
1876 INIT_LIST_HEAD(&hwep->qh.queue);
1877 hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1878 &hwep->qh.dma);
1879 if (hwep->qh.ptr == NULL)
1880 retval = -ENOMEM;
1881
1882 /*
1883 * set up shorthands for ep0 out and in endpoints,
1884 * don't add to gadget's ep_list
1885 */
1886 if (i == 0) {
1887 if (j == RX)
1888 ci->ep0out = hwep;
1889 else
1890 ci->ep0in = hwep;
1891
1892 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1893 continue;
1894 }
1895
1896 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1897 }
1898
1899 return retval;
1900 }
1901
destroy_eps(struct ci_hdrc * ci)1902 static void destroy_eps(struct ci_hdrc *ci)
1903 {
1904 int i;
1905
1906 for (i = 0; i < ci->hw_ep_max; i++) {
1907 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1908
1909 if (hwep->pending_td)
1910 free_pending_td(hwep);
1911 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1912 }
1913 }
1914
1915 /**
1916 * ci_udc_start: register a gadget driver
1917 * @gadget: our gadget
1918 * @driver: the driver being registered
1919 *
1920 * Interrupts are enabled here.
1921 */
ci_udc_start(struct usb_gadget * gadget,struct usb_gadget_driver * driver)1922 static int ci_udc_start(struct usb_gadget *gadget,
1923 struct usb_gadget_driver *driver)
1924 {
1925 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1926 int retval;
1927
1928 if (driver->disconnect == NULL)
1929 return -EINVAL;
1930
1931 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1932 retval = usb_ep_enable(&ci->ep0out->ep);
1933 if (retval)
1934 return retval;
1935
1936 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1937 retval = usb_ep_enable(&ci->ep0in->ep);
1938 if (retval)
1939 return retval;
1940
1941 ci->driver = driver;
1942
1943 /* Start otg fsm for B-device */
1944 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1945 ci_hdrc_otg_fsm_start(ci);
1946 return retval;
1947 }
1948
1949 if (ci->vbus_active)
1950 ci_hdrc_gadget_connect(gadget, 1);
1951 else
1952 usb_udc_vbus_handler(&ci->gadget, false);
1953
1954 return retval;
1955 }
1956
ci_udc_stop_for_otg_fsm(struct ci_hdrc * ci)1957 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1958 {
1959 if (!ci_otg_is_fsm_mode(ci))
1960 return;
1961
1962 mutex_lock(&ci->fsm.lock);
1963 if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1964 ci->fsm.a_bidl_adis_tmout = 1;
1965 ci_hdrc_otg_fsm_start(ci);
1966 } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1967 ci->fsm.protocol = PROTO_UNDEF;
1968 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1969 }
1970 mutex_unlock(&ci->fsm.lock);
1971 }
1972
1973 /*
1974 * ci_udc_stop: unregister a gadget driver
1975 */
ci_udc_stop(struct usb_gadget * gadget)1976 static int ci_udc_stop(struct usb_gadget *gadget)
1977 {
1978 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1979 unsigned long flags;
1980
1981 spin_lock_irqsave(&ci->lock, flags);
1982 ci->driver = NULL;
1983
1984 if (ci->vbus_active) {
1985 hw_device_state(ci, 0);
1986 spin_unlock_irqrestore(&ci->lock, flags);
1987 if (ci->platdata->notify_event)
1988 ci->platdata->notify_event(ci,
1989 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1990 _gadget_stop_activity(&ci->gadget);
1991 spin_lock_irqsave(&ci->lock, flags);
1992 pm_runtime_put(ci->dev);
1993 }
1994
1995 spin_unlock_irqrestore(&ci->lock, flags);
1996
1997 ci_udc_stop_for_otg_fsm(ci);
1998 return 0;
1999 }
2000
2001 /******************************************************************************
2002 * BUS block
2003 *****************************************************************************/
2004 /*
2005 * udc_irq: ci interrupt handler
2006 *
2007 * This function returns IRQ_HANDLED if the IRQ has been handled
2008 * It locks access to registers
2009 */
udc_irq(struct ci_hdrc * ci)2010 static irqreturn_t udc_irq(struct ci_hdrc *ci)
2011 {
2012 irqreturn_t retval;
2013 u32 intr;
2014
2015 if (ci == NULL)
2016 return IRQ_HANDLED;
2017
2018 spin_lock(&ci->lock);
2019
2020 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
2021 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
2022 USBMODE_CM_DC) {
2023 spin_unlock(&ci->lock);
2024 return IRQ_NONE;
2025 }
2026 }
2027 intr = hw_test_and_clear_intr_active(ci);
2028
2029 if (intr) {
2030 /* order defines priority - do NOT change it */
2031 if (USBi_URI & intr)
2032 isr_reset_handler(ci);
2033
2034 if (USBi_PCI & intr) {
2035 ci->gadget.speed = hw_port_is_high_speed(ci) ?
2036 USB_SPEED_HIGH : USB_SPEED_FULL;
2037 if (ci->suspended) {
2038 if (ci->driver->resume) {
2039 spin_unlock(&ci->lock);
2040 ci->driver->resume(&ci->gadget);
2041 spin_lock(&ci->lock);
2042 }
2043 ci->suspended = 0;
2044 usb_gadget_set_state(&ci->gadget,
2045 ci->resume_state);
2046 }
2047 }
2048
2049 if (USBi_UI & intr)
2050 isr_tr_complete_handler(ci);
2051
2052 if ((USBi_SLI & intr) && !(ci->suspended)) {
2053 ci->suspended = 1;
2054 ci->resume_state = ci->gadget.state;
2055 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
2056 ci->driver->suspend) {
2057 spin_unlock(&ci->lock);
2058 ci->driver->suspend(&ci->gadget);
2059 spin_lock(&ci->lock);
2060 }
2061 usb_gadget_set_state(&ci->gadget,
2062 USB_STATE_SUSPENDED);
2063 }
2064 retval = IRQ_HANDLED;
2065 } else {
2066 retval = IRQ_NONE;
2067 }
2068 spin_unlock(&ci->lock);
2069
2070 return retval;
2071 }
2072
2073 /**
2074 * udc_start: initialize gadget role
2075 * @ci: chipidea controller
2076 */
udc_start(struct ci_hdrc * ci)2077 static int udc_start(struct ci_hdrc *ci)
2078 {
2079 struct device *dev = ci->dev;
2080 struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
2081 int retval = 0;
2082
2083 ci->gadget.ops = &usb_gadget_ops;
2084 ci->gadget.speed = USB_SPEED_UNKNOWN;
2085 ci->gadget.max_speed = USB_SPEED_HIGH;
2086 ci->gadget.name = ci->platdata->name;
2087 ci->gadget.otg_caps = otg_caps;
2088 ci->gadget.sg_supported = 1;
2089 ci->gadget.irq = ci->irq;
2090
2091 if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
2092 ci->gadget.quirk_avoids_skb_reserve = 1;
2093
2094 if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
2095 otg_caps->adp_support))
2096 ci->gadget.is_otg = 1;
2097
2098 INIT_LIST_HEAD(&ci->gadget.ep_list);
2099
2100 /* alloc resources */
2101 ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
2102 sizeof(struct ci_hw_qh),
2103 64, CI_HDRC_PAGE_SIZE);
2104 if (ci->qh_pool == NULL)
2105 return -ENOMEM;
2106
2107 ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
2108 sizeof(struct ci_hw_td),
2109 64, CI_HDRC_PAGE_SIZE);
2110 if (ci->td_pool == NULL) {
2111 retval = -ENOMEM;
2112 goto free_qh_pool;
2113 }
2114
2115 retval = init_eps(ci);
2116 if (retval)
2117 goto free_pools;
2118
2119 ci->gadget.ep0 = &ci->ep0in->ep;
2120
2121 retval = usb_add_gadget_udc(dev, &ci->gadget);
2122 if (retval)
2123 goto destroy_eps;
2124
2125 return retval;
2126
2127 destroy_eps:
2128 destroy_eps(ci);
2129 free_pools:
2130 dma_pool_destroy(ci->td_pool);
2131 free_qh_pool:
2132 dma_pool_destroy(ci->qh_pool);
2133 return retval;
2134 }
2135
2136 /*
2137 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
2138 *
2139 * No interrupts active, the IRQ has been released
2140 */
ci_hdrc_gadget_destroy(struct ci_hdrc * ci)2141 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
2142 {
2143 if (!ci->roles[CI_ROLE_GADGET])
2144 return;
2145
2146 usb_del_gadget_udc(&ci->gadget);
2147
2148 destroy_eps(ci);
2149
2150 dma_pool_destroy(ci->td_pool);
2151 dma_pool_destroy(ci->qh_pool);
2152 }
2153
udc_id_switch_for_device(struct ci_hdrc * ci)2154 static int udc_id_switch_for_device(struct ci_hdrc *ci)
2155 {
2156 if (ci->platdata->pins_device)
2157 pinctrl_select_state(ci->platdata->pctl,
2158 ci->platdata->pins_device);
2159
2160 if (ci->is_otg)
2161 /* Clear and enable BSV irq */
2162 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2163 OTGSC_BSVIS | OTGSC_BSVIE);
2164
2165 return 0;
2166 }
2167
udc_id_switch_for_host(struct ci_hdrc * ci)2168 static void udc_id_switch_for_host(struct ci_hdrc *ci)
2169 {
2170 /*
2171 * host doesn't care B_SESSION_VALID event
2172 * so clear and disable BSV irq
2173 */
2174 if (ci->is_otg)
2175 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
2176
2177 ci->vbus_active = 0;
2178
2179 if (ci->platdata->pins_device && ci->platdata->pins_default)
2180 pinctrl_select_state(ci->platdata->pctl,
2181 ci->platdata->pins_default);
2182 }
2183
2184 /**
2185 * ci_hdrc_gadget_init - initialize device related bits
2186 * @ci: the controller
2187 *
2188 * This function initializes the gadget, if the device is "device capable".
2189 */
ci_hdrc_gadget_init(struct ci_hdrc * ci)2190 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2191 {
2192 struct ci_role_driver *rdrv;
2193 int ret;
2194
2195 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2196 return -ENXIO;
2197
2198 rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2199 if (!rdrv)
2200 return -ENOMEM;
2201
2202 rdrv->start = udc_id_switch_for_device;
2203 rdrv->stop = udc_id_switch_for_host;
2204 rdrv->irq = udc_irq;
2205 rdrv->name = "gadget";
2206
2207 ret = udc_start(ci);
2208 if (!ret)
2209 ci->roles[CI_ROLE_GADGET] = rdrv;
2210
2211 return ret;
2212 }
2213