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