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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
5 *
6 * Copyright 2008 Openmoko, Inc.
7 * Copyright 2008 Simtec Electronics
8 * Ben Dooks <ben@simtec.co.uk>
9 * http://armlinux.simtec.co.uk/
10 *
11 * S3C USB2.0 High-speed / OtG driver
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/spinlock.h>
17#include <linux/interrupt.h>
18#include <linux/platform_device.h>
19#include <linux/dma-mapping.h>
20#include <linux/mutex.h>
21#include <linux/seq_file.h>
22#include <linux/delay.h>
23#include <linux/io.h>
24#include <linux/slab.h>
25
26#include <linux/usb/ch9.h>
27#include <linux/usb/gadget.h>
28#include <linux/usb/phy.h>
29#include <linux/usb/composite.h>
30
31
32#include "core.h"
33#include "hw.h"
34
35/* conversion functions */
36static inline struct dwc2_hsotg_req *our_req(struct usb_request *req)
37{
38 return container_of(req, struct dwc2_hsotg_req, req);
39}
40
41static inline struct dwc2_hsotg_ep *our_ep(struct usb_ep *ep)
42{
43 return container_of(ep, struct dwc2_hsotg_ep, ep);
44}
45
46static inline struct dwc2_hsotg *to_hsotg(struct usb_gadget *gadget)
47{
48 return container_of(gadget, struct dwc2_hsotg, gadget);
49}
50
51static inline void dwc2_set_bit(struct dwc2_hsotg *hsotg, u32 offset, u32 val)
52{
53 dwc2_writel(hsotg, dwc2_readl(hsotg, offset) | val, offset);
54}
55
56static inline void dwc2_clear_bit(struct dwc2_hsotg *hsotg, u32 offset, u32 val)
57{
58 dwc2_writel(hsotg, dwc2_readl(hsotg, offset) & ~val, offset);
59}
60
61static inline struct dwc2_hsotg_ep *index_to_ep(struct dwc2_hsotg *hsotg,
62 u32 ep_index, u32 dir_in)
63{
64 if (dir_in)
65 return hsotg->eps_in[ep_index];
66 else
67 return hsotg->eps_out[ep_index];
68}
69
70/* forward declaration of functions */
71static void dwc2_hsotg_dump(struct dwc2_hsotg *hsotg);
72
73/**
74 * using_dma - return the DMA status of the driver.
75 * @hsotg: The driver state.
76 *
77 * Return true if we're using DMA.
78 *
79 * Currently, we have the DMA support code worked into everywhere
80 * that needs it, but the AMBA DMA implementation in the hardware can
81 * only DMA from 32bit aligned addresses. This means that gadgets such
82 * as the CDC Ethernet cannot work as they often pass packets which are
83 * not 32bit aligned.
84 *
85 * Unfortunately the choice to use DMA or not is global to the controller
86 * and seems to be only settable when the controller is being put through
87 * a core reset. This means we either need to fix the gadgets to take
88 * account of DMA alignment, or add bounce buffers (yuerk).
89 *
90 * g_using_dma is set depending on dts flag.
91 */
92static inline bool using_dma(struct dwc2_hsotg *hsotg)
93{
94 return hsotg->params.g_dma;
95}
96
97/*
98 * using_desc_dma - return the descriptor DMA status of the driver.
99 * @hsotg: The driver state.
100 *
101 * Return true if we're using descriptor DMA.
102 */
103static inline bool using_desc_dma(struct dwc2_hsotg *hsotg)
104{
105 return hsotg->params.g_dma_desc;
106}
107
108/**
109 * dwc2_gadget_incr_frame_num - Increments the targeted frame number.
110 * @hs_ep: The endpoint
111 *
112 * This function will also check if the frame number overruns DSTS_SOFFN_LIMIT.
113 * If an overrun occurs it will wrap the value and set the frame_overrun flag.
114 */
115static inline void dwc2_gadget_incr_frame_num(struct dwc2_hsotg_ep *hs_ep)
116{
117 struct dwc2_hsotg *hsotg = hs_ep->parent;
118 u16 limit = DSTS_SOFFN_LIMIT;
119
120 if (hsotg->gadget.speed != USB_SPEED_HIGH)
121 limit >>= 3;
122
123 hs_ep->target_frame += hs_ep->interval;
124 if (hs_ep->target_frame > limit) {
125 hs_ep->frame_overrun = true;
126 hs_ep->target_frame &= limit;
127 } else {
128 hs_ep->frame_overrun = false;
129 }
130}
131
132/**
133 * dwc2_gadget_dec_frame_num_by_one - Decrements the targeted frame number
134 * by one.
135 * @hs_ep: The endpoint.
136 *
137 * This function used in service interval based scheduling flow to calculate
138 * descriptor frame number filed value. For service interval mode frame
139 * number in descriptor should point to last (u)frame in the interval.
140 *
141 */
142static inline void dwc2_gadget_dec_frame_num_by_one(struct dwc2_hsotg_ep *hs_ep)
143{
144 struct dwc2_hsotg *hsotg = hs_ep->parent;
145 u16 limit = DSTS_SOFFN_LIMIT;
146
147 if (hsotg->gadget.speed != USB_SPEED_HIGH)
148 limit >>= 3;
149
150 if (hs_ep->target_frame)
151 hs_ep->target_frame -= 1;
152 else
153 hs_ep->target_frame = limit;
154}
155
156/**
157 * dwc2_hsotg_en_gsint - enable one or more of the general interrupt
158 * @hsotg: The device state
159 * @ints: A bitmask of the interrupts to enable
160 */
161static void dwc2_hsotg_en_gsint(struct dwc2_hsotg *hsotg, u32 ints)
162{
163 u32 gsintmsk = dwc2_readl(hsotg, GINTMSK);
164 u32 new_gsintmsk;
165
166 new_gsintmsk = gsintmsk | ints;
167
168 if (new_gsintmsk != gsintmsk) {
169 dev_dbg(hsotg->dev, "gsintmsk now 0x%08x\n", new_gsintmsk);
170 dwc2_writel(hsotg, new_gsintmsk, GINTMSK);
171 }
172}
173
174/**
175 * dwc2_hsotg_disable_gsint - disable one or more of the general interrupt
176 * @hsotg: The device state
177 * @ints: A bitmask of the interrupts to enable
178 */
179static void dwc2_hsotg_disable_gsint(struct dwc2_hsotg *hsotg, u32 ints)
180{
181 u32 gsintmsk = dwc2_readl(hsotg, GINTMSK);
182 u32 new_gsintmsk;
183
184 new_gsintmsk = gsintmsk & ~ints;
185
186 if (new_gsintmsk != gsintmsk)
187 dwc2_writel(hsotg, new_gsintmsk, GINTMSK);
188}
189
190/**
191 * dwc2_hsotg_ctrl_epint - enable/disable an endpoint irq
192 * @hsotg: The device state
193 * @ep: The endpoint index
194 * @dir_in: True if direction is in.
195 * @en: The enable value, true to enable
196 *
197 * Set or clear the mask for an individual endpoint's interrupt
198 * request.
199 */
200static void dwc2_hsotg_ctrl_epint(struct dwc2_hsotg *hsotg,
201 unsigned int ep, unsigned int dir_in,
202 unsigned int en)
203{
204 unsigned long flags;
205 u32 bit = 1 << ep;
206 u32 daint;
207
208 if (!dir_in)
209 bit <<= 16;
210
211 local_irq_save(flags);
212 daint = dwc2_readl(hsotg, DAINTMSK);
213 if (en)
214 daint |= bit;
215 else
216 daint &= ~bit;
217 dwc2_writel(hsotg, daint, DAINTMSK);
218 local_irq_restore(flags);
219}
220
221/**
222 * dwc2_hsotg_tx_fifo_count - return count of TX FIFOs in device mode
223 *
224 * @hsotg: Programming view of the DWC_otg controller
225 */
226int dwc2_hsotg_tx_fifo_count(struct dwc2_hsotg *hsotg)
227{
228 if (hsotg->hw_params.en_multiple_tx_fifo)
229 /* In dedicated FIFO mode we need count of IN EPs */
230 return hsotg->hw_params.num_dev_in_eps;
231 else
232 /* In shared FIFO mode we need count of Periodic IN EPs */
233 return hsotg->hw_params.num_dev_perio_in_ep;
234}
235
236/**
237 * dwc2_hsotg_tx_fifo_total_depth - return total FIFO depth available for
238 * device mode TX FIFOs
239 *
240 * @hsotg: Programming view of the DWC_otg controller
241 */
242int dwc2_hsotg_tx_fifo_total_depth(struct dwc2_hsotg *hsotg)
243{
244 int addr;
245 int tx_addr_max;
246 u32 np_tx_fifo_size;
247
248 np_tx_fifo_size = min_t(u32, hsotg->hw_params.dev_nperio_tx_fifo_size,
249 hsotg->params.g_np_tx_fifo_size);
250
251 /* Get Endpoint Info Control block size in DWORDs. */
252 tx_addr_max = hsotg->hw_params.total_fifo_size;
253
254 addr = hsotg->params.g_rx_fifo_size + np_tx_fifo_size;
255 if (tx_addr_max <= addr)
256 return 0;
257
258 return tx_addr_max - addr;
259}
260
261/**
262 * dwc2_gadget_wkup_alert_handler - Handler for WKUP_ALERT interrupt
263 *
264 * @hsotg: Programming view of the DWC_otg controller
265 *
266 */
267static void dwc2_gadget_wkup_alert_handler(struct dwc2_hsotg *hsotg)
268{
269 u32 gintsts2;
270 u32 gintmsk2;
271
272 gintsts2 = dwc2_readl(hsotg, GINTSTS2);
273 gintmsk2 = dwc2_readl(hsotg, GINTMSK2);
274 gintsts2 &= gintmsk2;
275
276 if (gintsts2 & GINTSTS2_WKUP_ALERT_INT) {
277 dev_dbg(hsotg->dev, "%s: Wkup_Alert_Int\n", __func__);
278 dwc2_set_bit(hsotg, GINTSTS2, GINTSTS2_WKUP_ALERT_INT);
279 dwc2_set_bit(hsotg, DCTL, DCTL_RMTWKUPSIG);
280 }
281}
282
283/**
284 * dwc2_hsotg_tx_fifo_average_depth - returns average depth of device mode
285 * TX FIFOs
286 *
287 * @hsotg: Programming view of the DWC_otg controller
288 */
289int dwc2_hsotg_tx_fifo_average_depth(struct dwc2_hsotg *hsotg)
290{
291 int tx_fifo_count;
292 int tx_fifo_depth;
293
294 tx_fifo_depth = dwc2_hsotg_tx_fifo_total_depth(hsotg);
295
296 tx_fifo_count = dwc2_hsotg_tx_fifo_count(hsotg);
297
298 if (!tx_fifo_count)
299 return tx_fifo_depth;
300 else
301 return tx_fifo_depth / tx_fifo_count;
302}
303
304/**
305 * dwc2_hsotg_init_fifo - initialise non-periodic FIFOs
306 * @hsotg: The device instance.
307 */
308static void dwc2_hsotg_init_fifo(struct dwc2_hsotg *hsotg)
309{
310 unsigned int ep;
311 unsigned int addr;
312 int timeout;
313
314 u32 val;
315 u32 *txfsz = hsotg->params.g_tx_fifo_size;
316
317 /* Reset fifo map if not correctly cleared during previous session */
318 WARN_ON(hsotg->fifo_map);
319 hsotg->fifo_map = 0;
320
321 /* set RX/NPTX FIFO sizes */
322 dwc2_writel(hsotg, hsotg->params.g_rx_fifo_size, GRXFSIZ);
323 dwc2_writel(hsotg, (hsotg->params.g_rx_fifo_size <<
324 FIFOSIZE_STARTADDR_SHIFT) |
325 (hsotg->params.g_np_tx_fifo_size << FIFOSIZE_DEPTH_SHIFT),
326 GNPTXFSIZ);
327
328 /*
329 * arange all the rest of the TX FIFOs, as some versions of this
330 * block have overlapping default addresses. This also ensures
331 * that if the settings have been changed, then they are set to
332 * known values.
333 */
334
335 /* start at the end of the GNPTXFSIZ, rounded up */
336 addr = hsotg->params.g_rx_fifo_size + hsotg->params.g_np_tx_fifo_size;
337
338 /*
339 * Configure fifos sizes from provided configuration and assign
340 * them to endpoints dynamically according to maxpacket size value of
341 * given endpoint.
342 */
343 for (ep = 1; ep < MAX_EPS_CHANNELS; ep++) {
344 if (!txfsz[ep])
345 continue;
346 val = addr;
347 val |= txfsz[ep] << FIFOSIZE_DEPTH_SHIFT;
348 WARN_ONCE(addr + txfsz[ep] > hsotg->fifo_mem,
349 "insufficient fifo memory");
350 addr += txfsz[ep];
351
352 dwc2_writel(hsotg, val, DPTXFSIZN(ep));
353 val = dwc2_readl(hsotg, DPTXFSIZN(ep));
354 }
355
356 dwc2_writel(hsotg, hsotg->hw_params.total_fifo_size |
357 addr << GDFIFOCFG_EPINFOBASE_SHIFT,
358 GDFIFOCFG);
359 /*
360 * according to p428 of the design guide, we need to ensure that
361 * all fifos are flushed before continuing
362 */
363
364 dwc2_writel(hsotg, GRSTCTL_TXFNUM(0x10) | GRSTCTL_TXFFLSH |
365 GRSTCTL_RXFFLSH, GRSTCTL);
366
367 /* wait until the fifos are both flushed */
368 timeout = 100;
369 while (1) {
370 val = dwc2_readl(hsotg, GRSTCTL);
371
372 if ((val & (GRSTCTL_TXFFLSH | GRSTCTL_RXFFLSH)) == 0)
373 break;
374
375 if (--timeout == 0) {
376 dev_err(hsotg->dev,
377 "%s: timeout flushing fifos (GRSTCTL=%08x)\n",
378 __func__, val);
379 break;
380 }
381
382 udelay(1);
383 }
384
385 dev_dbg(hsotg->dev, "FIFOs reset, timeout at %d\n", timeout);
386}
387
388/**
389 * dwc2_hsotg_ep_alloc_request - allocate USB rerequest structure
390 * @ep: USB endpoint to allocate request for.
391 * @flags: Allocation flags
392 *
393 * Allocate a new USB request structure appropriate for the specified endpoint
394 */
395static struct usb_request *dwc2_hsotg_ep_alloc_request(struct usb_ep *ep,
396 gfp_t flags)
397{
398 struct dwc2_hsotg_req *req;
399
400 req = kzalloc(sizeof(*req), flags);
401 if (!req)
402 return NULL;
403
404 INIT_LIST_HEAD(&req->queue);
405
406 return &req->req;
407}
408
409/**
410 * is_ep_periodic - return true if the endpoint is in periodic mode.
411 * @hs_ep: The endpoint to query.
412 *
413 * Returns true if the endpoint is in periodic mode, meaning it is being
414 * used for an Interrupt or ISO transfer.
415 */
416static inline int is_ep_periodic(struct dwc2_hsotg_ep *hs_ep)
417{
418 return hs_ep->periodic;
419}
420
421/**
422 * dwc2_hsotg_unmap_dma - unmap the DMA memory being used for the request
423 * @hsotg: The device state.
424 * @hs_ep: The endpoint for the request
425 * @hs_req: The request being processed.
426 *
427 * This is the reverse of dwc2_hsotg_map_dma(), called for the completion
428 * of a request to ensure the buffer is ready for access by the caller.
429 */
430static void dwc2_hsotg_unmap_dma(struct dwc2_hsotg *hsotg,
431 struct dwc2_hsotg_ep *hs_ep,
432 struct dwc2_hsotg_req *hs_req)
433{
434 struct usb_request *req = &hs_req->req;
435
436 usb_gadget_unmap_request(&hsotg->gadget, req, hs_ep->map_dir);
437}
438
439/*
440 * dwc2_gadget_alloc_ctrl_desc_chains - allocate DMA descriptor chains
441 * for Control endpoint
442 * @hsotg: The device state.
443 *
444 * This function will allocate 4 descriptor chains for EP 0: 2 for
445 * Setup stage, per one for IN and OUT data/status transactions.
446 */
447static int dwc2_gadget_alloc_ctrl_desc_chains(struct dwc2_hsotg *hsotg)
448{
449 hsotg->setup_desc[0] =
450 dmam_alloc_coherent(hsotg->dev,
451 sizeof(struct dwc2_dma_desc),
452 &hsotg->setup_desc_dma[0],
453 GFP_KERNEL);
454 if (!hsotg->setup_desc[0])
455 goto fail;
456
457 hsotg->setup_desc[1] =
458 dmam_alloc_coherent(hsotg->dev,
459 sizeof(struct dwc2_dma_desc),
460 &hsotg->setup_desc_dma[1],
461 GFP_KERNEL);
462 if (!hsotg->setup_desc[1])
463 goto fail;
464
465 hsotg->ctrl_in_desc =
466 dmam_alloc_coherent(hsotg->dev,
467 sizeof(struct dwc2_dma_desc),
468 &hsotg->ctrl_in_desc_dma,
469 GFP_KERNEL);
470 if (!hsotg->ctrl_in_desc)
471 goto fail;
472
473 hsotg->ctrl_out_desc =
474 dmam_alloc_coherent(hsotg->dev,
475 sizeof(struct dwc2_dma_desc),
476 &hsotg->ctrl_out_desc_dma,
477 GFP_KERNEL);
478 if (!hsotg->ctrl_out_desc)
479 goto fail;
480
481 return 0;
482
483fail:
484 return -ENOMEM;
485}
486
487/**
488 * dwc2_hsotg_write_fifo - write packet Data to the TxFIFO
489 * @hsotg: The controller state.
490 * @hs_ep: The endpoint we're going to write for.
491 * @hs_req: The request to write data for.
492 *
493 * This is called when the TxFIFO has some space in it to hold a new
494 * transmission and we have something to give it. The actual setup of
495 * the data size is done elsewhere, so all we have to do is to actually
496 * write the data.
497 *
498 * The return value is zero if there is more space (or nothing was done)
499 * otherwise -ENOSPC is returned if the FIFO space was used up.
500 *
501 * This routine is only needed for PIO
502 */
503static int dwc2_hsotg_write_fifo(struct dwc2_hsotg *hsotg,
504 struct dwc2_hsotg_ep *hs_ep,
505 struct dwc2_hsotg_req *hs_req)
506{
507 bool periodic = is_ep_periodic(hs_ep);
508 u32 gnptxsts = dwc2_readl(hsotg, GNPTXSTS);
509 int buf_pos = hs_req->req.actual;
510 int to_write = hs_ep->size_loaded;
511 void *data;
512 int can_write;
513 int pkt_round;
514 int max_transfer;
515
516 to_write -= (buf_pos - hs_ep->last_load);
517
518 /* if there's nothing to write, get out early */
519 if (to_write == 0)
520 return 0;
521
522 if (periodic && !hsotg->dedicated_fifos) {
523 u32 epsize = dwc2_readl(hsotg, DIEPTSIZ(hs_ep->index));
524 int size_left;
525 int size_done;
526
527 /*
528 * work out how much data was loaded so we can calculate
529 * how much data is left in the fifo.
530 */
531
532 size_left = DXEPTSIZ_XFERSIZE_GET(epsize);
533
534 /*
535 * if shared fifo, we cannot write anything until the
536 * previous data has been completely sent.
537 */
538 if (hs_ep->fifo_load != 0) {
539 dwc2_hsotg_en_gsint(hsotg, GINTSTS_PTXFEMP);
540 return -ENOSPC;
541 }
542
543 dev_dbg(hsotg->dev, "%s: left=%d, load=%d, fifo=%d, size %d\n",
544 __func__, size_left,
545 hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size);
546
547 /* how much of the data has moved */
548 size_done = hs_ep->size_loaded - size_left;
549
550 /* how much data is left in the fifo */
551 can_write = hs_ep->fifo_load - size_done;
552 dev_dbg(hsotg->dev, "%s: => can_write1=%d\n",
553 __func__, can_write);
554
555 can_write = hs_ep->fifo_size - can_write;
556 dev_dbg(hsotg->dev, "%s: => can_write2=%d\n",
557 __func__, can_write);
558
559 if (can_write <= 0) {
560 dwc2_hsotg_en_gsint(hsotg, GINTSTS_PTXFEMP);
561 return -ENOSPC;
562 }
563 } else if (hsotg->dedicated_fifos && hs_ep->index != 0) {
564 can_write = dwc2_readl(hsotg,
565 DTXFSTS(hs_ep->fifo_index));
566
567 can_write &= 0xffff;
568 can_write *= 4;
569 } else {
570 if (GNPTXSTS_NP_TXQ_SPC_AVAIL_GET(gnptxsts) == 0) {
571 dev_dbg(hsotg->dev,
572 "%s: no queue slots available (0x%08x)\n",
573 __func__, gnptxsts);
574
575 dwc2_hsotg_en_gsint(hsotg, GINTSTS_NPTXFEMP);
576 return -ENOSPC;
577 }
578
579 can_write = GNPTXSTS_NP_TXF_SPC_AVAIL_GET(gnptxsts);
580 can_write *= 4; /* fifo size is in 32bit quantities. */
581 }
582
583 max_transfer = hs_ep->ep.maxpacket * hs_ep->mc;
584
585 dev_dbg(hsotg->dev, "%s: GNPTXSTS=%08x, can=%d, to=%d, max_transfer %d\n",
586 __func__, gnptxsts, can_write, to_write, max_transfer);
587
588 /*
589 * limit to 512 bytes of data, it seems at least on the non-periodic
590 * FIFO, requests of >512 cause the endpoint to get stuck with a
591 * fragment of the end of the transfer in it.
592 */
593 if (can_write > 512 && !periodic)
594 can_write = 512;
595
596 /*
597 * limit the write to one max-packet size worth of data, but allow
598 * the transfer to return that it did not run out of fifo space
599 * doing it.
600 */
601 if (to_write > max_transfer) {
602 to_write = max_transfer;
603
604 /* it's needed only when we do not use dedicated fifos */
605 if (!hsotg->dedicated_fifos)
606 dwc2_hsotg_en_gsint(hsotg,
607 periodic ? GINTSTS_PTXFEMP :
608 GINTSTS_NPTXFEMP);
609 }
610
611 /* see if we can write data */
612
613 if (to_write > can_write) {
614 to_write = can_write;
615 pkt_round = to_write % max_transfer;
616
617 /*
618 * Round the write down to an
619 * exact number of packets.
620 *
621 * Note, we do not currently check to see if we can ever
622 * write a full packet or not to the FIFO.
623 */
624
625 if (pkt_round)
626 to_write -= pkt_round;
627
628 /*
629 * enable correct FIFO interrupt to alert us when there
630 * is more room left.
631 */
632
633 /* it's needed only when we do not use dedicated fifos */
634 if (!hsotg->dedicated_fifos)
635 dwc2_hsotg_en_gsint(hsotg,
636 periodic ? GINTSTS_PTXFEMP :
637 GINTSTS_NPTXFEMP);
638 }
639
640 dev_dbg(hsotg->dev, "write %d/%d, can_write %d, done %d\n",
641 to_write, hs_req->req.length, can_write, buf_pos);
642
643 if (to_write <= 0)
644 return -ENOSPC;
645
646 hs_req->req.actual = buf_pos + to_write;
647 hs_ep->total_data += to_write;
648
649 if (periodic)
650 hs_ep->fifo_load += to_write;
651
652 to_write = DIV_ROUND_UP(to_write, 4);
653 data = hs_req->req.buf + buf_pos;
654
655 dwc2_writel_rep(hsotg, EPFIFO(hs_ep->index), data, to_write);
656
657 return (to_write >= can_write) ? -ENOSPC : 0;
658}
659
660/**
661 * get_ep_limit - get the maximum data legnth for this endpoint
662 * @hs_ep: The endpoint
663 *
664 * Return the maximum data that can be queued in one go on a given endpoint
665 * so that transfers that are too long can be split.
666 */
667static unsigned int get_ep_limit(struct dwc2_hsotg_ep *hs_ep)
668{
669 int index = hs_ep->index;
670 unsigned int maxsize;
671 unsigned int maxpkt;
672
673 if (index != 0) {
674 maxsize = DXEPTSIZ_XFERSIZE_LIMIT + 1;
675 maxpkt = DXEPTSIZ_PKTCNT_LIMIT + 1;
676 } else {
677 maxsize = 64 + 64;
678 if (hs_ep->dir_in)
679 maxpkt = DIEPTSIZ0_PKTCNT_LIMIT + 1;
680 else
681 maxpkt = 2;
682 }
683
684 /* we made the constant loading easier above by using +1 */
685 maxpkt--;
686 maxsize--;
687
688 /*
689 * constrain by packet count if maxpkts*pktsize is greater
690 * than the length register size.
691 */
692
693 if ((maxpkt * hs_ep->ep.maxpacket) < maxsize)
694 maxsize = maxpkt * hs_ep->ep.maxpacket;
695
696 return maxsize;
697}
698
699/**
700 * dwc2_hsotg_read_frameno - read current frame number
701 * @hsotg: The device instance
702 *
703 * Return the current frame number
704 */
705static u32 dwc2_hsotg_read_frameno(struct dwc2_hsotg *hsotg)
706{
707 u32 dsts;
708
709 dsts = dwc2_readl(hsotg, DSTS);
710 dsts &= DSTS_SOFFN_MASK;
711 dsts >>= DSTS_SOFFN_SHIFT;
712
713 return dsts;
714}
715
716/**
717 * dwc2_gadget_get_chain_limit - get the maximum data payload value of the
718 * DMA descriptor chain prepared for specific endpoint
719 * @hs_ep: The endpoint
720 *
721 * Return the maximum data that can be queued in one go on a given endpoint
722 * depending on its descriptor chain capacity so that transfers that
723 * are too long can be split.
724 */
725static unsigned int dwc2_gadget_get_chain_limit(struct dwc2_hsotg_ep *hs_ep)
726{
727 const struct usb_endpoint_descriptor *ep_desc = hs_ep->ep.desc;
728 int is_isoc = hs_ep->isochronous;
729 unsigned int maxsize;
730 u32 mps = hs_ep->ep.maxpacket;
731 int dir_in = hs_ep->dir_in;
732
733 if (is_isoc)
734 maxsize = (hs_ep->dir_in ? DEV_DMA_ISOC_TX_NBYTES_LIMIT :
735 DEV_DMA_ISOC_RX_NBYTES_LIMIT) *
736 MAX_DMA_DESC_NUM_HS_ISOC;
737 else
738 maxsize = DEV_DMA_NBYTES_LIMIT * MAX_DMA_DESC_NUM_GENERIC;
739
740 /* Interrupt OUT EP with mps not multiple of 4 */
741 if (hs_ep->index)
742 if (usb_endpoint_xfer_int(ep_desc) && !dir_in && (mps % 4))
743 maxsize = mps * MAX_DMA_DESC_NUM_GENERIC;
744
745 return maxsize;
746}
747
748/*
749 * dwc2_gadget_get_desc_params - get DMA descriptor parameters.
750 * @hs_ep: The endpoint
751 * @mask: RX/TX bytes mask to be defined
752 *
753 * Returns maximum data payload for one descriptor after analyzing endpoint
754 * characteristics.
755 * DMA descriptor transfer bytes limit depends on EP type:
756 * Control out - MPS,
757 * Isochronous - descriptor rx/tx bytes bitfield limit,
758 * Control In/Bulk/Interrupt - multiple of mps. This will allow to not
759 * have concatenations from various descriptors within one packet.
760 * Interrupt OUT - if mps not multiple of 4 then a single packet corresponds
761 * to a single descriptor.
762 *
763 * Selects corresponding mask for RX/TX bytes as well.
764 */
765static u32 dwc2_gadget_get_desc_params(struct dwc2_hsotg_ep *hs_ep, u32 *mask)
766{
767 const struct usb_endpoint_descriptor *ep_desc = hs_ep->ep.desc;
768 u32 mps = hs_ep->ep.maxpacket;
769 int dir_in = hs_ep->dir_in;
770 u32 desc_size = 0;
771
772 if (!hs_ep->index && !dir_in) {
773 desc_size = mps;
774 *mask = DEV_DMA_NBYTES_MASK;
775 } else if (hs_ep->isochronous) {
776 if (dir_in) {
777 desc_size = DEV_DMA_ISOC_TX_NBYTES_LIMIT;
778 *mask = DEV_DMA_ISOC_TX_NBYTES_MASK;
779 } else {
780 desc_size = DEV_DMA_ISOC_RX_NBYTES_LIMIT;
781 *mask = DEV_DMA_ISOC_RX_NBYTES_MASK;
782 }
783 } else {
784 desc_size = DEV_DMA_NBYTES_LIMIT;
785 *mask = DEV_DMA_NBYTES_MASK;
786
787 /* Round down desc_size to be mps multiple */
788 desc_size -= desc_size % mps;
789 }
790
791 /* Interrupt OUT EP with mps not multiple of 4 */
792 if (hs_ep->index)
793 if (usb_endpoint_xfer_int(ep_desc) && !dir_in && (mps % 4)) {
794 desc_size = mps;
795 *mask = DEV_DMA_NBYTES_MASK;
796 }
797
798 return desc_size;
799}
800
801static void dwc2_gadget_fill_nonisoc_xfer_ddma_one(struct dwc2_hsotg_ep *hs_ep,
802 struct dwc2_dma_desc **desc,
803 dma_addr_t dma_buff,
804 unsigned int len,
805 bool true_last)
806{
807 int dir_in = hs_ep->dir_in;
808 u32 mps = hs_ep->ep.maxpacket;
809 u32 maxsize = 0;
810 u32 offset = 0;
811 u32 mask = 0;
812 int i;
813
814 maxsize = dwc2_gadget_get_desc_params(hs_ep, &mask);
815
816 hs_ep->desc_count = (len / maxsize) +
817 ((len % maxsize) ? 1 : 0);
818 if (len == 0)
819 hs_ep->desc_count = 1;
820
821 for (i = 0; i < hs_ep->desc_count; ++i) {
822 (*desc)->status = 0;
823 (*desc)->status |= (DEV_DMA_BUFF_STS_HBUSY
824 << DEV_DMA_BUFF_STS_SHIFT);
825
826 if (len > maxsize) {
827 if (!hs_ep->index && !dir_in)
828 (*desc)->status |= (DEV_DMA_L | DEV_DMA_IOC);
829
830 (*desc)->status |=
831 maxsize << DEV_DMA_NBYTES_SHIFT & mask;
832 (*desc)->buf = dma_buff + offset;
833
834 len -= maxsize;
835 offset += maxsize;
836 } else {
837 if (true_last)
838 (*desc)->status |= (DEV_DMA_L | DEV_DMA_IOC);
839
840 if (dir_in)
841 (*desc)->status |= (len % mps) ? DEV_DMA_SHORT :
842 ((hs_ep->send_zlp && true_last) ?
843 DEV_DMA_SHORT : 0);
844
845 (*desc)->status |=
846 len << DEV_DMA_NBYTES_SHIFT & mask;
847 (*desc)->buf = dma_buff + offset;
848 }
849
850 (*desc)->status &= ~DEV_DMA_BUFF_STS_MASK;
851 (*desc)->status |= (DEV_DMA_BUFF_STS_HREADY
852 << DEV_DMA_BUFF_STS_SHIFT);
853 (*desc)++;
854 }
855}
856
857/*
858 * dwc2_gadget_config_nonisoc_xfer_ddma - prepare non ISOC DMA desc chain.
859 * @hs_ep: The endpoint
860 * @ureq: Request to transfer
861 * @offset: offset in bytes
862 * @len: Length of the transfer
863 *
864 * This function will iterate over descriptor chain and fill its entries
865 * with corresponding information based on transfer data.
866 */
867static void dwc2_gadget_config_nonisoc_xfer_ddma(struct dwc2_hsotg_ep *hs_ep,
868 dma_addr_t dma_buff,
869 unsigned int len)
870{
871 struct usb_request *ureq = NULL;
872 struct dwc2_dma_desc *desc = hs_ep->desc_list;
873 struct scatterlist *sg;
874 int i;
875 u8 desc_count = 0;
876
877 if (hs_ep->req)
878 ureq = &hs_ep->req->req;
879
880 /* non-DMA sg buffer */
881 if (!ureq || !ureq->num_sgs) {
882 dwc2_gadget_fill_nonisoc_xfer_ddma_one(hs_ep, &desc,
883 dma_buff, len, true);
884 return;
885 }
886
887 /* DMA sg buffer */
888 for_each_sg(ureq->sg, sg, ureq->num_sgs, i) {
889 dwc2_gadget_fill_nonisoc_xfer_ddma_one(hs_ep, &desc,
890 sg_dma_address(sg) + sg->offset, sg_dma_len(sg),
891 sg_is_last(sg));
892 desc_count += hs_ep->desc_count;
893 }
894
895 hs_ep->desc_count = desc_count;
896}
897
898/*
899 * dwc2_gadget_fill_isoc_desc - fills next isochronous descriptor in chain.
900 * @hs_ep: The isochronous endpoint.
901 * @dma_buff: usb requests dma buffer.
902 * @len: usb request transfer length.
903 *
904 * Fills next free descriptor with the data of the arrived usb request,
905 * frame info, sets Last and IOC bits increments next_desc. If filled
906 * descriptor is not the first one, removes L bit from the previous descriptor
907 * status.
908 */
909static int dwc2_gadget_fill_isoc_desc(struct dwc2_hsotg_ep *hs_ep,
910 dma_addr_t dma_buff, unsigned int len)
911{
912 struct dwc2_dma_desc *desc;
913 struct dwc2_hsotg *hsotg = hs_ep->parent;
914 u32 index;
915 u32 mask = 0;
916 u8 pid = 0;
917
918 dwc2_gadget_get_desc_params(hs_ep, &mask);
919
920 index = hs_ep->next_desc;
921 desc = &hs_ep->desc_list[index];
922
923 /* Check if descriptor chain full */
924 if ((desc->status >> DEV_DMA_BUFF_STS_SHIFT) ==
925 DEV_DMA_BUFF_STS_HREADY) {
926 dev_dbg(hsotg->dev, "%s: desc chain full\n", __func__);
927 return 1;
928 }
929
930 /* Clear L bit of previous desc if more than one entries in the chain */
931 if (hs_ep->next_desc)
932 hs_ep->desc_list[index - 1].status &= ~DEV_DMA_L;
933
934 dev_dbg(hsotg->dev, "%s: Filling ep %d, dir %s isoc desc # %d\n",
935 __func__, hs_ep->index, hs_ep->dir_in ? "in" : "out", index);
936
937 desc->status = 0;
938 desc->status |= (DEV_DMA_BUFF_STS_HBUSY << DEV_DMA_BUFF_STS_SHIFT);
939
940 desc->buf = dma_buff;
941 desc->status |= (DEV_DMA_L | DEV_DMA_IOC |
942 ((len << DEV_DMA_NBYTES_SHIFT) & mask));
943
944 if (hs_ep->dir_in) {
945 if (len)
946 pid = DIV_ROUND_UP(len, hs_ep->ep.maxpacket);
947 else
948 pid = 1;
949 desc->status |= ((pid << DEV_DMA_ISOC_PID_SHIFT) &
950 DEV_DMA_ISOC_PID_MASK) |
951 ((len % hs_ep->ep.maxpacket) ?
952 DEV_DMA_SHORT : 0) |
953 ((hs_ep->target_frame <<
954 DEV_DMA_ISOC_FRNUM_SHIFT) &
955 DEV_DMA_ISOC_FRNUM_MASK);
956 }
957
958 desc->status &= ~DEV_DMA_BUFF_STS_MASK;
959 desc->status |= (DEV_DMA_BUFF_STS_HREADY << DEV_DMA_BUFF_STS_SHIFT);
960
961 /* Increment frame number by interval for IN */
962 if (hs_ep->dir_in)
963 dwc2_gadget_incr_frame_num(hs_ep);
964
965 /* Update index of last configured entry in the chain */
966 hs_ep->next_desc++;
967 if (hs_ep->next_desc >= MAX_DMA_DESC_NUM_HS_ISOC)
968 hs_ep->next_desc = 0;
969
970 return 0;
971}
972
973/*
974 * dwc2_gadget_start_isoc_ddma - start isochronous transfer in DDMA
975 * @hs_ep: The isochronous endpoint.
976 *
977 * Prepare descriptor chain for isochronous endpoints. Afterwards
978 * write DMA address to HW and enable the endpoint.
979 */
980static void dwc2_gadget_start_isoc_ddma(struct dwc2_hsotg_ep *hs_ep)
981{
982 struct dwc2_hsotg *hsotg = hs_ep->parent;
983 struct dwc2_hsotg_req *hs_req, *treq;
984 int index = hs_ep->index;
985 int ret;
986 int i;
987 u32 dma_reg;
988 u32 depctl;
989 u32 ctrl;
990 struct dwc2_dma_desc *desc;
991
992 if (list_empty(&hs_ep->queue)) {
993 hs_ep->target_frame = TARGET_FRAME_INITIAL;
994 dev_dbg(hsotg->dev, "%s: No requests in queue\n", __func__);
995 return;
996 }
997
998 /* Initialize descriptor chain by Host Busy status */
999 for (i = 0; i < MAX_DMA_DESC_NUM_HS_ISOC; i++) {
1000 desc = &hs_ep->desc_list[i];
1001 desc->status = 0;
1002 desc->status |= (DEV_DMA_BUFF_STS_HBUSY
1003 << DEV_DMA_BUFF_STS_SHIFT);
1004 }
1005
1006 hs_ep->next_desc = 0;
1007 list_for_each_entry_safe(hs_req, treq, &hs_ep->queue, queue) {
1008 dma_addr_t dma_addr = hs_req->req.dma;
1009
1010 if (hs_req->req.num_sgs) {
1011 WARN_ON(hs_req->req.num_sgs > 1);
1012 dma_addr = sg_dma_address(hs_req->req.sg);
1013 }
1014 ret = dwc2_gadget_fill_isoc_desc(hs_ep, dma_addr,
1015 hs_req->req.length);
1016 if (ret)
1017 break;
1018 }
1019
1020 hs_ep->compl_desc = 0;
1021 depctl = hs_ep->dir_in ? DIEPCTL(index) : DOEPCTL(index);
1022 dma_reg = hs_ep->dir_in ? DIEPDMA(index) : DOEPDMA(index);
1023
1024 /* write descriptor chain address to control register */
1025 dwc2_writel(hsotg, hs_ep->desc_list_dma, dma_reg);
1026
1027 ctrl = dwc2_readl(hsotg, depctl);
1028 ctrl |= DXEPCTL_EPENA | DXEPCTL_CNAK;
1029 dwc2_writel(hsotg, ctrl, depctl);
1030}
1031
1032static bool dwc2_gadget_target_frame_elapsed(struct dwc2_hsotg_ep *hs_ep);
1033static void dwc2_hsotg_complete_request(struct dwc2_hsotg *hsotg,
1034 struct dwc2_hsotg_ep *hs_ep,
1035 struct dwc2_hsotg_req *hs_req,
1036 int result);
1037
1038/**
1039 * dwc2_hsotg_start_req - start a USB request from an endpoint's queue
1040 * @hsotg: The controller state.
1041 * @hs_ep: The endpoint to process a request for
1042 * @hs_req: The request to start.
1043 * @continuing: True if we are doing more for the current request.
1044 *
1045 * Start the given request running by setting the endpoint registers
1046 * appropriately, and writing any data to the FIFOs.
1047 */
1048static void dwc2_hsotg_start_req(struct dwc2_hsotg *hsotg,
1049 struct dwc2_hsotg_ep *hs_ep,
1050 struct dwc2_hsotg_req *hs_req,
1051 bool continuing)
1052{
1053 struct usb_request *ureq = &hs_req->req;
1054 int index = hs_ep->index;
1055 int dir_in = hs_ep->dir_in;
1056 u32 epctrl_reg;
1057 u32 epsize_reg;
1058 u32 epsize;
1059 u32 ctrl;
1060 unsigned int length;
1061 unsigned int packets;
1062 unsigned int maxreq;
1063 unsigned int dma_reg;
1064
1065 if (index != 0) {
1066 if (hs_ep->req && !continuing) {
1067 dev_err(hsotg->dev, "%s: active request\n", __func__);
1068 WARN_ON(1);
1069 return;
1070 } else if (hs_ep->req != hs_req && continuing) {
1071 dev_err(hsotg->dev,
1072 "%s: continue different req\n", __func__);
1073 WARN_ON(1);
1074 return;
1075 }
1076 }
1077
1078 dma_reg = dir_in ? DIEPDMA(index) : DOEPDMA(index);
1079 epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);
1080 epsize_reg = dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index);
1081
1082 dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x, ep %d, dir %s\n",
1083 __func__, dwc2_readl(hsotg, epctrl_reg), index,
1084 hs_ep->dir_in ? "in" : "out");
1085
1086 /* If endpoint is stalled, we will restart request later */
1087 ctrl = dwc2_readl(hsotg, epctrl_reg);
1088
1089 if (index && ctrl & DXEPCTL_STALL) {
1090 dev_warn(hsotg->dev, "%s: ep%d is stalled\n", __func__, index);
1091 return;
1092 }
1093
1094 length = ureq->length - ureq->actual;
1095 dev_dbg(hsotg->dev, "ureq->length:%d ureq->actual:%d\n",
1096 ureq->length, ureq->actual);
1097
1098 if (!using_desc_dma(hsotg))
1099 maxreq = get_ep_limit(hs_ep);
1100 else
1101 maxreq = dwc2_gadget_get_chain_limit(hs_ep);
1102
1103 if (length > maxreq) {
1104 int round = maxreq % hs_ep->ep.maxpacket;
1105
1106 dev_dbg(hsotg->dev, "%s: length %d, max-req %d, r %d\n",
1107 __func__, length, maxreq, round);
1108
1109 /* round down to multiple of packets */
1110 if (round)
1111 maxreq -= round;
1112
1113 length = maxreq;
1114 }
1115
1116 if (length)
1117 packets = DIV_ROUND_UP(length, hs_ep->ep.maxpacket);
1118 else
1119 packets = 1; /* send one packet if length is zero. */
1120
1121 if (dir_in && index != 0)
1122 if (hs_ep->isochronous)
1123 epsize = DXEPTSIZ_MC(packets);
1124 else
1125 epsize = DXEPTSIZ_MC(1);
1126 else
1127 epsize = 0;
1128
1129 /*
1130 * zero length packet should be programmed on its own and should not
1131 * be counted in DIEPTSIZ.PktCnt with other packets.
1132 */
1133 if (dir_in && ureq->zero && !continuing) {
1134 /* Test if zlp is actually required. */
1135 if ((ureq->length >= hs_ep->ep.maxpacket) &&
1136 !(ureq->length % hs_ep->ep.maxpacket))
1137 hs_ep->send_zlp = 1;
1138 }
1139
1140 epsize |= DXEPTSIZ_PKTCNT(packets);
1141 epsize |= DXEPTSIZ_XFERSIZE(length);
1142
1143 dev_dbg(hsotg->dev, "%s: %d@%d/%d, 0x%08x => 0x%08x\n",
1144 __func__, packets, length, ureq->length, epsize, epsize_reg);
1145
1146 /* store the request as the current one we're doing */
1147 hs_ep->req = hs_req;
1148
1149 if (using_desc_dma(hsotg)) {
1150 u32 offset = 0;
1151 u32 mps = hs_ep->ep.maxpacket;
1152
1153 /* Adjust length: EP0 - MPS, other OUT EPs - multiple of MPS */
1154 if (!dir_in) {
1155 if (!index)
1156 length = mps;
1157 else if (length % mps)
1158 length += (mps - (length % mps));
1159 }
1160
1161 if (continuing)
1162 offset = ureq->actual;
1163
1164 /* Fill DDMA chain entries */
1165 dwc2_gadget_config_nonisoc_xfer_ddma(hs_ep, ureq->dma + offset,
1166 length);
1167
1168 /* write descriptor chain address to control register */
1169 dwc2_writel(hsotg, hs_ep->desc_list_dma, dma_reg);
1170
1171 dev_dbg(hsotg->dev, "%s: %08x pad => 0x%08x\n",
1172 __func__, (u32)hs_ep->desc_list_dma, dma_reg);
1173 } else {
1174 /* write size / packets */
1175 dwc2_writel(hsotg, epsize, epsize_reg);
1176
1177 if (using_dma(hsotg) && !continuing && (length != 0)) {
1178 /*
1179 * write DMA address to control register, buffer
1180 * already synced by dwc2_hsotg_ep_queue().
1181 */
1182
1183 dwc2_writel(hsotg, ureq->dma, dma_reg);
1184
1185 dev_dbg(hsotg->dev, "%s: %pad => 0x%08x\n",
1186 __func__, &ureq->dma, dma_reg);
1187 }
1188 }
1189
1190 if (hs_ep->isochronous) {
1191 if (!dwc2_gadget_target_frame_elapsed(hs_ep)) {
1192 if (hs_ep->interval == 1) {
1193 if (hs_ep->target_frame & 0x1)
1194 ctrl |= DXEPCTL_SETODDFR;
1195 else
1196 ctrl |= DXEPCTL_SETEVENFR;
1197 }
1198 ctrl |= DXEPCTL_CNAK;
1199 } else {
1200 hs_req->req.frame_number = hs_ep->target_frame;
1201 hs_req->req.actual = 0;
1202 dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, -ENODATA);
1203 return;
1204 }
1205 }
1206
1207 ctrl |= DXEPCTL_EPENA; /* ensure ep enabled */
1208
1209 dev_dbg(hsotg->dev, "ep0 state:%d\n", hsotg->ep0_state);
1210
1211 /* For Setup request do not clear NAK */
1212 if (!(index == 0 && hsotg->ep0_state == DWC2_EP0_SETUP))
1213 ctrl |= DXEPCTL_CNAK; /* clear NAK set by core */
1214
1215 dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl);
1216 dwc2_writel(hsotg, ctrl, epctrl_reg);
1217
1218 /*
1219 * set these, it seems that DMA support increments past the end
1220 * of the packet buffer so we need to calculate the length from
1221 * this information.
1222 */
1223 hs_ep->size_loaded = length;
1224 hs_ep->last_load = ureq->actual;
1225
1226 if (dir_in && !using_dma(hsotg)) {
1227 /* set these anyway, we may need them for non-periodic in */
1228 hs_ep->fifo_load = 0;
1229
1230 dwc2_hsotg_write_fifo(hsotg, hs_ep, hs_req);
1231 }
1232
1233 /*
1234 * Note, trying to clear the NAK here causes problems with transmit
1235 * on the S3C6400 ending up with the TXFIFO becoming full.
1236 */
1237
1238 /* check ep is enabled */
1239 if (!(dwc2_readl(hsotg, epctrl_reg) & DXEPCTL_EPENA))
1240 dev_dbg(hsotg->dev,
1241 "ep%d: failed to become enabled (DXEPCTL=0x%08x)?\n",
1242 index, dwc2_readl(hsotg, epctrl_reg));
1243
1244 dev_dbg(hsotg->dev, "%s: DXEPCTL=0x%08x\n",
1245 __func__, dwc2_readl(hsotg, epctrl_reg));
1246
1247 /* enable ep interrupts */
1248 dwc2_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 1);
1249}
1250
1251/**
1252 * dwc2_hsotg_map_dma - map the DMA memory being used for the request
1253 * @hsotg: The device state.
1254 * @hs_ep: The endpoint the request is on.
1255 * @req: The request being processed.
1256 *
1257 * We've been asked to queue a request, so ensure that the memory buffer
1258 * is correctly setup for DMA. If we've been passed an extant DMA address
1259 * then ensure the buffer has been synced to memory. If our buffer has no
1260 * DMA memory, then we map the memory and mark our request to allow us to
1261 * cleanup on completion.
1262 */
1263static int dwc2_hsotg_map_dma(struct dwc2_hsotg *hsotg,
1264 struct dwc2_hsotg_ep *hs_ep,
1265 struct usb_request *req)
1266{
1267 int ret;
1268
1269 hs_ep->map_dir = hs_ep->dir_in;
1270 ret = usb_gadget_map_request(&hsotg->gadget, req, hs_ep->dir_in);
1271 if (ret)
1272 goto dma_error;
1273
1274 return 0;
1275
1276dma_error:
1277 dev_err(hsotg->dev, "%s: failed to map buffer %p, %d bytes\n",
1278 __func__, req->buf, req->length);
1279
1280 return -EIO;
1281}
1282
1283static int dwc2_hsotg_handle_unaligned_buf_start(struct dwc2_hsotg *hsotg,
1284 struct dwc2_hsotg_ep *hs_ep,
1285 struct dwc2_hsotg_req *hs_req)
1286{
1287 void *req_buf = hs_req->req.buf;
1288
1289 /* If dma is not being used or buffer is aligned */
1290 if (!using_dma(hsotg) || !((long)req_buf & 3))
1291 return 0;
1292
1293 WARN_ON(hs_req->saved_req_buf);
1294
1295 dev_dbg(hsotg->dev, "%s: %s: buf=%p length=%d\n", __func__,
1296 hs_ep->ep.name, req_buf, hs_req->req.length);
1297
1298 hs_req->req.buf = kmalloc(hs_req->req.length, GFP_ATOMIC);
1299 if (!hs_req->req.buf) {
1300 hs_req->req.buf = req_buf;
1301 dev_err(hsotg->dev,
1302 "%s: unable to allocate memory for bounce buffer\n",
1303 __func__);
1304 return -ENOMEM;
1305 }
1306
1307 /* Save actual buffer */
1308 hs_req->saved_req_buf = req_buf;
1309
1310 if (hs_ep->dir_in)
1311 memcpy(hs_req->req.buf, req_buf, hs_req->req.length);
1312 return 0;
1313}
1314
1315static void
1316dwc2_hsotg_handle_unaligned_buf_complete(struct dwc2_hsotg *hsotg,
1317 struct dwc2_hsotg_ep *hs_ep,
1318 struct dwc2_hsotg_req *hs_req)
1319{
1320 /* If dma is not being used or buffer was aligned */
1321 if (!using_dma(hsotg) || !hs_req->saved_req_buf)
1322 return;
1323
1324 dev_dbg(hsotg->dev, "%s: %s: status=%d actual-length=%d\n", __func__,
1325 hs_ep->ep.name, hs_req->req.status, hs_req->req.actual);
1326
1327 /* Copy data from bounce buffer on successful out transfer */
1328 if (!hs_ep->dir_in && !hs_req->req.status)
1329 memcpy(hs_req->saved_req_buf, hs_req->req.buf,
1330 hs_req->req.actual);
1331
1332 /* Free bounce buffer */
1333 kfree(hs_req->req.buf);
1334
1335 hs_req->req.buf = hs_req->saved_req_buf;
1336 hs_req->saved_req_buf = NULL;
1337}
1338
1339/**
1340 * dwc2_gadget_target_frame_elapsed - Checks target frame
1341 * @hs_ep: The driver endpoint to check
1342 *
1343 * Returns 1 if targeted frame elapsed. If returned 1 then we need to drop
1344 * corresponding transfer.
1345 */
1346static bool dwc2_gadget_target_frame_elapsed(struct dwc2_hsotg_ep *hs_ep)
1347{
1348 struct dwc2_hsotg *hsotg = hs_ep->parent;
1349 u32 target_frame = hs_ep->target_frame;
1350 u32 current_frame = hsotg->frame_number;
1351 bool frame_overrun = hs_ep->frame_overrun;
1352 u16 limit = DSTS_SOFFN_LIMIT;
1353
1354 if (hsotg->gadget.speed != USB_SPEED_HIGH)
1355 limit >>= 3;
1356
1357 if (!frame_overrun && current_frame >= target_frame)
1358 return true;
1359
1360 if (frame_overrun && current_frame >= target_frame &&
1361 ((current_frame - target_frame) < limit / 2))
1362 return true;
1363
1364 return false;
1365}
1366
1367/*
1368 * dwc2_gadget_set_ep0_desc_chain - Set EP's desc chain pointers
1369 * @hsotg: The driver state
1370 * @hs_ep: the ep descriptor chain is for
1371 *
1372 * Called to update EP0 structure's pointers depend on stage of
1373 * control transfer.
1374 */
1375static int dwc2_gadget_set_ep0_desc_chain(struct dwc2_hsotg *hsotg,
1376 struct dwc2_hsotg_ep *hs_ep)
1377{
1378 switch (hsotg->ep0_state) {
1379 case DWC2_EP0_SETUP:
1380 case DWC2_EP0_STATUS_OUT:
1381 hs_ep->desc_list = hsotg->setup_desc[0];
1382 hs_ep->desc_list_dma = hsotg->setup_desc_dma[0];
1383 break;
1384 case DWC2_EP0_DATA_IN:
1385 case DWC2_EP0_STATUS_IN:
1386 hs_ep->desc_list = hsotg->ctrl_in_desc;
1387 hs_ep->desc_list_dma = hsotg->ctrl_in_desc_dma;
1388 break;
1389 case DWC2_EP0_DATA_OUT:
1390 hs_ep->desc_list = hsotg->ctrl_out_desc;
1391 hs_ep->desc_list_dma = hsotg->ctrl_out_desc_dma;
1392 break;
1393 default:
1394 dev_err(hsotg->dev, "invalid EP 0 state in queue %d\n",
1395 hsotg->ep0_state);
1396 return -EINVAL;
1397 }
1398
1399 return 0;
1400}
1401
1402static int dwc2_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req,
1403 gfp_t gfp_flags)
1404{
1405 struct dwc2_hsotg_req *hs_req = our_req(req);
1406 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
1407 struct dwc2_hsotg *hs = hs_ep->parent;
1408 bool first;
1409 int ret;
1410 u32 maxsize = 0;
1411 u32 mask = 0;
1412
1413
1414 dev_dbg(hs->dev, "%s: req %p: %d@%p, noi=%d, zero=%d, snok=%d\n",
1415 ep->name, req, req->length, req->buf, req->no_interrupt,
1416 req->zero, req->short_not_ok);
1417
1418 /* Prevent new request submission when controller is suspended */
1419 if (hs->lx_state != DWC2_L0) {
1420 dev_dbg(hs->dev, "%s: submit request only in active state\n",
1421 __func__);
1422 return -EAGAIN;
1423 }
1424
1425 /* initialise status of the request */
1426 INIT_LIST_HEAD(&hs_req->queue);
1427 req->actual = 0;
1428 req->status = -EINPROGRESS;
1429
1430 /* Don't queue ISOC request if length greater than mps*mc */
1431 if (hs_ep->isochronous &&
1432 req->length > (hs_ep->mc * hs_ep->ep.maxpacket)) {
1433 dev_err(hs->dev, "req length > maxpacket*mc\n");
1434 return -EINVAL;
1435 }
1436
1437 /* In DDMA mode for ISOC's don't queue request if length greater
1438 * than descriptor limits.
1439 */
1440 if (using_desc_dma(hs) && hs_ep->isochronous) {
1441 maxsize = dwc2_gadget_get_desc_params(hs_ep, &mask);
1442 if (hs_ep->dir_in && req->length > maxsize) {
1443 dev_err(hs->dev, "wrong length %d (maxsize=%d)\n",
1444 req->length, maxsize);
1445 return -EINVAL;
1446 }
1447
1448 if (!hs_ep->dir_in && req->length > hs_ep->ep.maxpacket) {
1449 dev_err(hs->dev, "ISOC OUT: wrong length %d (mps=%d)\n",
1450 req->length, hs_ep->ep.maxpacket);
1451 return -EINVAL;
1452 }
1453 }
1454
1455 ret = dwc2_hsotg_handle_unaligned_buf_start(hs, hs_ep, hs_req);
1456 if (ret)
1457 return ret;
1458
1459 /* if we're using DMA, sync the buffers as necessary */
1460 if (using_dma(hs)) {
1461 ret = dwc2_hsotg_map_dma(hs, hs_ep, req);
1462 if (ret)
1463 return ret;
1464 }
1465 /* If using descriptor DMA configure EP0 descriptor chain pointers */
1466 if (using_desc_dma(hs) && !hs_ep->index) {
1467 ret = dwc2_gadget_set_ep0_desc_chain(hs, hs_ep);
1468 if (ret)
1469 return ret;
1470 }
1471
1472 first = list_empty(&hs_ep->queue);
1473 list_add_tail(&hs_req->queue, &hs_ep->queue);
1474
1475 /*
1476 * Handle DDMA isochronous transfers separately - just add new entry
1477 * to the descriptor chain.
1478 * Transfer will be started once SW gets either one of NAK or
1479 * OutTknEpDis interrupts.
1480 */
1481 if (using_desc_dma(hs) && hs_ep->isochronous) {
1482 if (hs_ep->target_frame != TARGET_FRAME_INITIAL) {
1483 dma_addr_t dma_addr = hs_req->req.dma;
1484
1485 if (hs_req->req.num_sgs) {
1486 WARN_ON(hs_req->req.num_sgs > 1);
1487 dma_addr = sg_dma_address(hs_req->req.sg);
1488 }
1489 dwc2_gadget_fill_isoc_desc(hs_ep, dma_addr,
1490 hs_req->req.length);
1491 }
1492 return 0;
1493 }
1494
1495 /* Change EP direction if status phase request is after data out */
1496 if (!hs_ep->index && !req->length && !hs_ep->dir_in &&
1497 hs->ep0_state == DWC2_EP0_DATA_OUT)
1498 hs_ep->dir_in = 1;
1499
1500 if (first) {
1501 if (!hs_ep->isochronous) {
1502 dwc2_hsotg_start_req(hs, hs_ep, hs_req, false);
1503 return 0;
1504 }
1505
1506 /* Update current frame number value. */
1507 hs->frame_number = dwc2_hsotg_read_frameno(hs);
1508 while (dwc2_gadget_target_frame_elapsed(hs_ep)) {
1509 dwc2_gadget_incr_frame_num(hs_ep);
1510 /* Update current frame number value once more as it
1511 * changes here.
1512 */
1513 hs->frame_number = dwc2_hsotg_read_frameno(hs);
1514 }
1515
1516 if (hs_ep->target_frame != TARGET_FRAME_INITIAL)
1517 dwc2_hsotg_start_req(hs, hs_ep, hs_req, false);
1518 }
1519 return 0;
1520}
1521
1522static int dwc2_hsotg_ep_queue_lock(struct usb_ep *ep, struct usb_request *req,
1523 gfp_t gfp_flags)
1524{
1525 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
1526 struct dwc2_hsotg *hs = hs_ep->parent;
1527 unsigned long flags;
1528 int ret;
1529
1530 spin_lock_irqsave(&hs->lock, flags);
1531 ret = dwc2_hsotg_ep_queue(ep, req, gfp_flags);
1532 spin_unlock_irqrestore(&hs->lock, flags);
1533
1534 return ret;
1535}
1536
1537static void dwc2_hsotg_ep_free_request(struct usb_ep *ep,
1538 struct usb_request *req)
1539{
1540 struct dwc2_hsotg_req *hs_req = our_req(req);
1541
1542 kfree(hs_req);
1543}
1544
1545/**
1546 * dwc2_hsotg_complete_oursetup - setup completion callback
1547 * @ep: The endpoint the request was on.
1548 * @req: The request completed.
1549 *
1550 * Called on completion of any requests the driver itself
1551 * submitted that need cleaning up.
1552 */
1553static void dwc2_hsotg_complete_oursetup(struct usb_ep *ep,
1554 struct usb_request *req)
1555{
1556 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
1557 struct dwc2_hsotg *hsotg = hs_ep->parent;
1558
1559 dev_dbg(hsotg->dev, "%s: ep %p, req %p\n", __func__, ep, req);
1560
1561 dwc2_hsotg_ep_free_request(ep, req);
1562}
1563
1564/**
1565 * ep_from_windex - convert control wIndex value to endpoint
1566 * @hsotg: The driver state.
1567 * @windex: The control request wIndex field (in host order).
1568 *
1569 * Convert the given wIndex into a pointer to an driver endpoint
1570 * structure, or return NULL if it is not a valid endpoint.
1571 */
1572static struct dwc2_hsotg_ep *ep_from_windex(struct dwc2_hsotg *hsotg,
1573 u32 windex)
1574{
1575 int dir = (windex & USB_DIR_IN) ? 1 : 0;
1576 int idx = windex & 0x7F;
1577
1578 if (windex >= 0x100)
1579 return NULL;
1580
1581 if (idx > hsotg->num_of_eps)
1582 return NULL;
1583
1584 return index_to_ep(hsotg, idx, dir);
1585}
1586
1587/**
1588 * dwc2_hsotg_set_test_mode - Enable usb Test Modes
1589 * @hsotg: The driver state.
1590 * @testmode: requested usb test mode
1591 * Enable usb Test Mode requested by the Host.
1592 */
1593int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, int testmode)
1594{
1595 int dctl = dwc2_readl(hsotg, DCTL);
1596
1597 dctl &= ~DCTL_TSTCTL_MASK;
1598 switch (testmode) {
1599 case USB_TEST_J:
1600 case USB_TEST_K:
1601 case USB_TEST_SE0_NAK:
1602 case USB_TEST_PACKET:
1603 case USB_TEST_FORCE_ENABLE:
1604 dctl |= testmode << DCTL_TSTCTL_SHIFT;
1605 break;
1606 default:
1607 return -EINVAL;
1608 }
1609 dwc2_writel(hsotg, dctl, DCTL);
1610 return 0;
1611}
1612
1613/**
1614 * dwc2_hsotg_send_reply - send reply to control request
1615 * @hsotg: The device state
1616 * @ep: Endpoint 0
1617 * @buff: Buffer for request
1618 * @length: Length of reply.
1619 *
1620 * Create a request and queue it on the given endpoint. This is useful as
1621 * an internal method of sending replies to certain control requests, etc.
1622 */
1623static int dwc2_hsotg_send_reply(struct dwc2_hsotg *hsotg,
1624 struct dwc2_hsotg_ep *ep,
1625 void *buff,
1626 int length)
1627{
1628 struct usb_request *req;
1629 int ret;
1630
1631 dev_dbg(hsotg->dev, "%s: buff %p, len %d\n", __func__, buff, length);
1632
1633 req = dwc2_hsotg_ep_alloc_request(&ep->ep, GFP_ATOMIC);
1634 hsotg->ep0_reply = req;
1635 if (!req) {
1636 dev_warn(hsotg->dev, "%s: cannot alloc req\n", __func__);
1637 return -ENOMEM;
1638 }
1639
1640 req->buf = hsotg->ep0_buff;
1641 req->length = length;
1642 /*
1643 * zero flag is for sending zlp in DATA IN stage. It has no impact on
1644 * STATUS stage.
1645 */
1646 req->zero = 0;
1647 req->complete = dwc2_hsotg_complete_oursetup;
1648
1649 if (length)
1650 memcpy(req->buf, buff, length);
1651
1652 ret = dwc2_hsotg_ep_queue(&ep->ep, req, GFP_ATOMIC);
1653 if (ret) {
1654 dev_warn(hsotg->dev, "%s: cannot queue req\n", __func__);
1655 return ret;
1656 }
1657
1658 return 0;
1659}
1660
1661/**
1662 * dwc2_hsotg_process_req_status - process request GET_STATUS
1663 * @hsotg: The device state
1664 * @ctrl: USB control request
1665 */
1666static int dwc2_hsotg_process_req_status(struct dwc2_hsotg *hsotg,
1667 struct usb_ctrlrequest *ctrl)
1668{
1669 struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
1670 struct dwc2_hsotg_ep *ep;
1671 __le16 reply;
1672 u16 status;
1673 int ret;
1674
1675 dev_dbg(hsotg->dev, "%s: USB_REQ_GET_STATUS\n", __func__);
1676
1677 if (!ep0->dir_in) {
1678 dev_warn(hsotg->dev, "%s: direction out?\n", __func__);
1679 return -EINVAL;
1680 }
1681
1682 switch (ctrl->bRequestType & USB_RECIP_MASK) {
1683 case USB_RECIP_DEVICE:
1684 status = hsotg->gadget.is_selfpowered <<
1685 USB_DEVICE_SELF_POWERED;
1686 status |= hsotg->remote_wakeup_allowed <<
1687 USB_DEVICE_REMOTE_WAKEUP;
1688 reply = cpu_to_le16(status);
1689 break;
1690
1691 case USB_RECIP_INTERFACE:
1692 /* currently, the data result should be zero */
1693 reply = cpu_to_le16(0);
1694 break;
1695
1696 case USB_RECIP_ENDPOINT:
1697 ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex));
1698 if (!ep)
1699 return -ENOENT;
1700
1701 reply = cpu_to_le16(ep->halted ? 1 : 0);
1702 break;
1703
1704 default:
1705 return 0;
1706 }
1707
1708 if (le16_to_cpu(ctrl->wLength) != 2)
1709 return -EINVAL;
1710
1711 ret = dwc2_hsotg_send_reply(hsotg, ep0, &reply, 2);
1712 if (ret) {
1713 dev_err(hsotg->dev, "%s: failed to send reply\n", __func__);
1714 return ret;
1715 }
1716
1717 return 1;
1718}
1719
1720static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value, bool now);
1721
1722/**
1723 * get_ep_head - return the first request on the endpoint
1724 * @hs_ep: The controller endpoint to get
1725 *
1726 * Get the first request on the endpoint.
1727 */
1728static struct dwc2_hsotg_req *get_ep_head(struct dwc2_hsotg_ep *hs_ep)
1729{
1730 return list_first_entry_or_null(&hs_ep->queue, struct dwc2_hsotg_req,
1731 queue);
1732}
1733
1734/**
1735 * dwc2_gadget_start_next_request - Starts next request from ep queue
1736 * @hs_ep: Endpoint structure
1737 *
1738 * If queue is empty and EP is ISOC-OUT - unmasks OUTTKNEPDIS which is masked
1739 * in its handler. Hence we need to unmask it here to be able to do
1740 * resynchronization.
1741 */
1742static void dwc2_gadget_start_next_request(struct dwc2_hsotg_ep *hs_ep)
1743{
1744 struct dwc2_hsotg *hsotg = hs_ep->parent;
1745 int dir_in = hs_ep->dir_in;
1746 struct dwc2_hsotg_req *hs_req;
1747
1748 if (!list_empty(&hs_ep->queue)) {
1749 hs_req = get_ep_head(hs_ep);
1750 dwc2_hsotg_start_req(hsotg, hs_ep, hs_req, false);
1751 return;
1752 }
1753 if (!hs_ep->isochronous)
1754 return;
1755
1756 if (dir_in) {
1757 dev_dbg(hsotg->dev, "%s: No more ISOC-IN requests\n",
1758 __func__);
1759 } else {
1760 dev_dbg(hsotg->dev, "%s: No more ISOC-OUT requests\n",
1761 __func__);
1762 }
1763}
1764
1765/**
1766 * dwc2_hsotg_process_req_feature - process request {SET,CLEAR}_FEATURE
1767 * @hsotg: The device state
1768 * @ctrl: USB control request
1769 */
1770static int dwc2_hsotg_process_req_feature(struct dwc2_hsotg *hsotg,
1771 struct usb_ctrlrequest *ctrl)
1772{
1773 struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
1774 struct dwc2_hsotg_req *hs_req;
1775 bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
1776 struct dwc2_hsotg_ep *ep;
1777 int ret;
1778 bool halted;
1779 u32 recip;
1780 u32 wValue;
1781 u32 wIndex;
1782
1783 dev_dbg(hsotg->dev, "%s: %s_FEATURE\n",
1784 __func__, set ? "SET" : "CLEAR");
1785
1786 wValue = le16_to_cpu(ctrl->wValue);
1787 wIndex = le16_to_cpu(ctrl->wIndex);
1788 recip = ctrl->bRequestType & USB_RECIP_MASK;
1789
1790 switch (recip) {
1791 case USB_RECIP_DEVICE:
1792 switch (wValue) {
1793 case USB_DEVICE_REMOTE_WAKEUP:
1794 if (set)
1795 hsotg->remote_wakeup_allowed = 1;
1796 else
1797 hsotg->remote_wakeup_allowed = 0;
1798 break;
1799
1800 case USB_DEVICE_TEST_MODE:
1801 if ((wIndex & 0xff) != 0)
1802 return -EINVAL;
1803 if (!set)
1804 return -EINVAL;
1805
1806 hsotg->test_mode = wIndex >> 8;
1807 break;
1808 default:
1809 return -ENOENT;
1810 }
1811
1812 ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
1813 if (ret) {
1814 dev_err(hsotg->dev,
1815 "%s: failed to send reply\n", __func__);
1816 return ret;
1817 }
1818 break;
1819
1820 case USB_RECIP_ENDPOINT:
1821 ep = ep_from_windex(hsotg, wIndex);
1822 if (!ep) {
1823 dev_dbg(hsotg->dev, "%s: no endpoint for 0x%04x\n",
1824 __func__, wIndex);
1825 return -ENOENT;
1826 }
1827
1828 switch (wValue) {
1829 case USB_ENDPOINT_HALT:
1830 halted = ep->halted;
1831
1832 if (!ep->wedged)
1833 dwc2_hsotg_ep_sethalt(&ep->ep, set, true);
1834
1835 ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
1836 if (ret) {
1837 dev_err(hsotg->dev,
1838 "%s: failed to send reply\n", __func__);
1839 return ret;
1840 }
1841
1842 /*
1843 * we have to complete all requests for ep if it was
1844 * halted, and the halt was cleared by CLEAR_FEATURE
1845 */
1846
1847 if (!set && halted) {
1848 /*
1849 * If we have request in progress,
1850 * then complete it
1851 */
1852 if (ep->req) {
1853 hs_req = ep->req;
1854 ep->req = NULL;
1855 list_del_init(&hs_req->queue);
1856 if (hs_req->req.complete) {
1857 spin_unlock(&hsotg->lock);
1858 usb_gadget_giveback_request(
1859 &ep->ep, &hs_req->req);
1860 spin_lock(&hsotg->lock);
1861 }
1862 }
1863
1864 /* If we have pending request, then start it */
1865 if (!ep->req)
1866 dwc2_gadget_start_next_request(ep);
1867 }
1868
1869 break;
1870
1871 default:
1872 return -ENOENT;
1873 }
1874 break;
1875 default:
1876 return -ENOENT;
1877 }
1878 return 1;
1879}
1880
1881static void dwc2_hsotg_enqueue_setup(struct dwc2_hsotg *hsotg);
1882
1883/**
1884 * dwc2_hsotg_stall_ep0 - stall ep0
1885 * @hsotg: The device state
1886 *
1887 * Set stall for ep0 as response for setup request.
1888 */
1889static void dwc2_hsotg_stall_ep0(struct dwc2_hsotg *hsotg)
1890{
1891 struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
1892 u32 reg;
1893 u32 ctrl;
1894
1895 dev_dbg(hsotg->dev, "ep0 stall (dir=%d)\n", ep0->dir_in);
1896 reg = (ep0->dir_in) ? DIEPCTL0 : DOEPCTL0;
1897
1898 /*
1899 * DxEPCTL_Stall will be cleared by EP once it has
1900 * taken effect, so no need to clear later.
1901 */
1902
1903 ctrl = dwc2_readl(hsotg, reg);
1904 ctrl |= DXEPCTL_STALL;
1905 ctrl |= DXEPCTL_CNAK;
1906 dwc2_writel(hsotg, ctrl, reg);
1907
1908 dev_dbg(hsotg->dev,
1909 "written DXEPCTL=0x%08x to %08x (DXEPCTL=0x%08x)\n",
1910 ctrl, reg, dwc2_readl(hsotg, reg));
1911
1912 /*
1913 * complete won't be called, so we enqueue
1914 * setup request here
1915 */
1916 dwc2_hsotg_enqueue_setup(hsotg);
1917}
1918
1919/**
1920 * dwc2_hsotg_process_control - process a control request
1921 * @hsotg: The device state
1922 * @ctrl: The control request received
1923 *
1924 * The controller has received the SETUP phase of a control request, and
1925 * needs to work out what to do next (and whether to pass it on to the
1926 * gadget driver).
1927 */
1928static void dwc2_hsotg_process_control(struct dwc2_hsotg *hsotg,
1929 struct usb_ctrlrequest *ctrl)
1930{
1931 struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0];
1932 int ret = 0;
1933 u32 dcfg;
1934
1935 dev_dbg(hsotg->dev,
1936 "ctrl Type=%02x, Req=%02x, V=%04x, I=%04x, L=%04x\n",
1937 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1938 ctrl->wIndex, ctrl->wLength);
1939
1940 if (ctrl->wLength == 0) {
1941 ep0->dir_in = 1;
1942 hsotg->ep0_state = DWC2_EP0_STATUS_IN;
1943 } else if (ctrl->bRequestType & USB_DIR_IN) {
1944 ep0->dir_in = 1;
1945 hsotg->ep0_state = DWC2_EP0_DATA_IN;
1946 } else {
1947 ep0->dir_in = 0;
1948 hsotg->ep0_state = DWC2_EP0_DATA_OUT;
1949 }
1950
1951 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
1952 switch (ctrl->bRequest) {
1953 case USB_REQ_SET_ADDRESS:
1954 hsotg->connected = 1;
1955 dcfg = dwc2_readl(hsotg, DCFG);
1956 dcfg &= ~DCFG_DEVADDR_MASK;
1957 dcfg |= (le16_to_cpu(ctrl->wValue) <<
1958 DCFG_DEVADDR_SHIFT) & DCFG_DEVADDR_MASK;
1959 dwc2_writel(hsotg, dcfg, DCFG);
1960
1961 dev_info(hsotg->dev, "new address %d\n", ctrl->wValue);
1962
1963 ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
1964 return;
1965
1966 case USB_REQ_GET_STATUS:
1967 ret = dwc2_hsotg_process_req_status(hsotg, ctrl);
1968 break;
1969
1970 case USB_REQ_CLEAR_FEATURE:
1971 case USB_REQ_SET_FEATURE:
1972 ret = dwc2_hsotg_process_req_feature(hsotg, ctrl);
1973 break;
1974 }
1975 }
1976
1977 /* as a fallback, try delivering it to the driver to deal with */
1978
1979 if (ret == 0 && hsotg->driver) {
1980 spin_unlock(&hsotg->lock);
1981 ret = hsotg->driver->setup(&hsotg->gadget, ctrl);
1982 spin_lock(&hsotg->lock);
1983 if (ret < 0)
1984 dev_dbg(hsotg->dev, "driver->setup() ret %d\n", ret);
1985 }
1986
1987 hsotg->delayed_status = false;
1988 if (ret == USB_GADGET_DELAYED_STATUS)
1989 hsotg->delayed_status = true;
1990
1991 /*
1992 * the request is either unhandlable, or is not formatted correctly
1993 * so respond with a STALL for the status stage to indicate failure.
1994 */
1995
1996 if (ret < 0)
1997 dwc2_hsotg_stall_ep0(hsotg);
1998}
1999
2000/**
2001 * dwc2_hsotg_complete_setup - completion of a setup transfer
2002 * @ep: The endpoint the request was on.
2003 * @req: The request completed.
2004 *
2005 * Called on completion of any requests the driver itself submitted for
2006 * EP0 setup packets
2007 */
2008static void dwc2_hsotg_complete_setup(struct usb_ep *ep,
2009 struct usb_request *req)
2010{
2011 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
2012 struct dwc2_hsotg *hsotg = hs_ep->parent;
2013
2014 if (req->status < 0) {
2015 dev_dbg(hsotg->dev, "%s: failed %d\n", __func__, req->status);
2016 return;
2017 }
2018
2019 spin_lock(&hsotg->lock);
2020 if (req->actual == 0)
2021 dwc2_hsotg_enqueue_setup(hsotg);
2022 else
2023 dwc2_hsotg_process_control(hsotg, req->buf);
2024 spin_unlock(&hsotg->lock);
2025}
2026
2027/**
2028 * dwc2_hsotg_enqueue_setup - start a request for EP0 packets
2029 * @hsotg: The device state.
2030 *
2031 * Enqueue a request on EP0 if necessary to received any SETUP packets
2032 * received from the host.
2033 */
2034static void dwc2_hsotg_enqueue_setup(struct dwc2_hsotg *hsotg)
2035{
2036 struct usb_request *req = hsotg->ctrl_req;
2037 struct dwc2_hsotg_req *hs_req = our_req(req);
2038 int ret;
2039
2040 dev_dbg(hsotg->dev, "%s: queueing setup request\n", __func__);
2041
2042 req->zero = 0;
2043 req->length = 8;
2044 req->buf = hsotg->ctrl_buff;
2045 req->complete = dwc2_hsotg_complete_setup;
2046
2047 if (!list_empty(&hs_req->queue)) {
2048 dev_dbg(hsotg->dev, "%s already queued???\n", __func__);
2049 return;
2050 }
2051
2052 hsotg->eps_out[0]->dir_in = 0;
2053 hsotg->eps_out[0]->send_zlp = 0;
2054 hsotg->ep0_state = DWC2_EP0_SETUP;
2055
2056 ret = dwc2_hsotg_ep_queue(&hsotg->eps_out[0]->ep, req, GFP_ATOMIC);
2057 if (ret < 0) {
2058 dev_err(hsotg->dev, "%s: failed queue (%d)\n", __func__, ret);
2059 /*
2060 * Don't think there's much we can do other than watch the
2061 * driver fail.
2062 */
2063 }
2064}
2065
2066static void dwc2_hsotg_program_zlp(struct dwc2_hsotg *hsotg,
2067 struct dwc2_hsotg_ep *hs_ep)
2068{
2069 u32 ctrl;
2070 u8 index = hs_ep->index;
2071 u32 epctl_reg = hs_ep->dir_in ? DIEPCTL(index) : DOEPCTL(index);
2072 u32 epsiz_reg = hs_ep->dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index);
2073
2074 if (hs_ep->dir_in)
2075 dev_dbg(hsotg->dev, "Sending zero-length packet on ep%d\n",
2076 index);
2077 else
2078 dev_dbg(hsotg->dev, "Receiving zero-length packet on ep%d\n",
2079 index);
2080 if (using_desc_dma(hsotg)) {
2081 /* Not specific buffer needed for ep0 ZLP */
2082 dma_addr_t dma = hs_ep->desc_list_dma;
2083
2084 if (!index)
2085 dwc2_gadget_set_ep0_desc_chain(hsotg, hs_ep);
2086
2087 dwc2_gadget_config_nonisoc_xfer_ddma(hs_ep, dma, 0);
2088 } else {
2089 dwc2_writel(hsotg, DXEPTSIZ_MC(1) | DXEPTSIZ_PKTCNT(1) |
2090 DXEPTSIZ_XFERSIZE(0),
2091 epsiz_reg);
2092 }
2093
2094 ctrl = dwc2_readl(hsotg, epctl_reg);
2095 ctrl |= DXEPCTL_CNAK; /* clear NAK set by core */
2096 ctrl |= DXEPCTL_EPENA; /* ensure ep enabled */
2097 ctrl |= DXEPCTL_USBACTEP;
2098 dwc2_writel(hsotg, ctrl, epctl_reg);
2099}
2100
2101/**
2102 * dwc2_hsotg_complete_request - complete a request given to us
2103 * @hsotg: The device state.
2104 * @hs_ep: The endpoint the request was on.
2105 * @hs_req: The request to complete.
2106 * @result: The result code (0 => Ok, otherwise errno)
2107 *
2108 * The given request has finished, so call the necessary completion
2109 * if it has one and then look to see if we can start a new request
2110 * on the endpoint.
2111 *
2112 * Note, expects the ep to already be locked as appropriate.
2113 */
2114static void dwc2_hsotg_complete_request(struct dwc2_hsotg *hsotg,
2115 struct dwc2_hsotg_ep *hs_ep,
2116 struct dwc2_hsotg_req *hs_req,
2117 int result)
2118{
2119 if (!hs_req) {
2120 dev_dbg(hsotg->dev, "%s: nothing to complete?\n", __func__);
2121 return;
2122 }
2123
2124 dev_dbg(hsotg->dev, "complete: ep %p %s, req %p, %d => %p\n",
2125 hs_ep, hs_ep->ep.name, hs_req, result, hs_req->req.complete);
2126
2127 /*
2128 * only replace the status if we've not already set an error
2129 * from a previous transaction
2130 */
2131
2132 if (hs_req->req.status == -EINPROGRESS)
2133 hs_req->req.status = result;
2134
2135 if (using_dma(hsotg))
2136 dwc2_hsotg_unmap_dma(hsotg, hs_ep, hs_req);
2137
2138 dwc2_hsotg_handle_unaligned_buf_complete(hsotg, hs_ep, hs_req);
2139
2140 hs_ep->req = NULL;
2141 list_del_init(&hs_req->queue);
2142
2143 /*
2144 * call the complete request with the locks off, just in case the
2145 * request tries to queue more work for this endpoint.
2146 */
2147
2148 if (hs_req->req.complete) {
2149 spin_unlock(&hsotg->lock);
2150 usb_gadget_giveback_request(&hs_ep->ep, &hs_req->req);
2151 spin_lock(&hsotg->lock);
2152 }
2153
2154 /* In DDMA don't need to proceed to starting of next ISOC request */
2155 if (using_desc_dma(hsotg) && hs_ep->isochronous)
2156 return;
2157
2158 /*
2159 * Look to see if there is anything else to do. Note, the completion
2160 * of the previous request may have caused a new request to be started
2161 * so be careful when doing this.
2162 */
2163
2164 if (!hs_ep->req && result >= 0)
2165 dwc2_gadget_start_next_request(hs_ep);
2166}
2167
2168/*
2169 * dwc2_gadget_complete_isoc_request_ddma - complete an isoc request in DDMA
2170 * @hs_ep: The endpoint the request was on.
2171 *
2172 * Get first request from the ep queue, determine descriptor on which complete
2173 * happened. SW discovers which descriptor currently in use by HW, adjusts
2174 * dma_address and calculates index of completed descriptor based on the value
2175 * of DEPDMA register. Update actual length of request, giveback to gadget.
2176 */
2177static void dwc2_gadget_complete_isoc_request_ddma(struct dwc2_hsotg_ep *hs_ep)
2178{
2179 struct dwc2_hsotg *hsotg = hs_ep->parent;
2180 struct dwc2_hsotg_req *hs_req;
2181 struct usb_request *ureq;
2182 u32 desc_sts;
2183 u32 mask;
2184
2185 desc_sts = hs_ep->desc_list[hs_ep->compl_desc].status;
2186
2187 /* Process only descriptors with buffer status set to DMA done */
2188 while ((desc_sts & DEV_DMA_BUFF_STS_MASK) >>
2189 DEV_DMA_BUFF_STS_SHIFT == DEV_DMA_BUFF_STS_DMADONE) {
2190
2191 hs_req = get_ep_head(hs_ep);
2192 if (!hs_req) {
2193 dev_warn(hsotg->dev, "%s: ISOC EP queue empty\n", __func__);
2194 return;
2195 }
2196 ureq = &hs_req->req;
2197
2198 /* Check completion status */
2199 if ((desc_sts & DEV_DMA_STS_MASK) >> DEV_DMA_STS_SHIFT ==
2200 DEV_DMA_STS_SUCC) {
2201 mask = hs_ep->dir_in ? DEV_DMA_ISOC_TX_NBYTES_MASK :
2202 DEV_DMA_ISOC_RX_NBYTES_MASK;
2203 ureq->actual = ureq->length - ((desc_sts & mask) >>
2204 DEV_DMA_ISOC_NBYTES_SHIFT);
2205
2206 /* Adjust actual len for ISOC Out if len is
2207 * not align of 4
2208 */
2209 if (!hs_ep->dir_in && ureq->length & 0x3)
2210 ureq->actual += 4 - (ureq->length & 0x3);
2211
2212 /* Set actual frame number for completed transfers */
2213 ureq->frame_number =
2214 (desc_sts & DEV_DMA_ISOC_FRNUM_MASK) >>
2215 DEV_DMA_ISOC_FRNUM_SHIFT;
2216 }
2217
2218 dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
2219
2220 hs_ep->compl_desc++;
2221 if (hs_ep->compl_desc > (MAX_DMA_DESC_NUM_HS_ISOC - 1))
2222 hs_ep->compl_desc = 0;
2223 desc_sts = hs_ep->desc_list[hs_ep->compl_desc].status;
2224 }
2225}
2226
2227/*
2228 * dwc2_gadget_handle_isoc_bna - handle BNA interrupt for ISOC.
2229 * @hs_ep: The isochronous endpoint.
2230 *
2231 * If EP ISOC OUT then need to flush RX FIFO to remove source of BNA
2232 * interrupt. Reset target frame and next_desc to allow to start
2233 * ISOC's on NAK interrupt for IN direction or on OUTTKNEPDIS
2234 * interrupt for OUT direction.
2235 */
2236static void dwc2_gadget_handle_isoc_bna(struct dwc2_hsotg_ep *hs_ep)
2237{
2238 struct dwc2_hsotg *hsotg = hs_ep->parent;
2239
2240 if (!hs_ep->dir_in)
2241 dwc2_flush_rx_fifo(hsotg);
2242 dwc2_hsotg_complete_request(hsotg, hs_ep, get_ep_head(hs_ep), 0);
2243
2244 hs_ep->target_frame = TARGET_FRAME_INITIAL;
2245 hs_ep->next_desc = 0;
2246 hs_ep->compl_desc = 0;
2247}
2248
2249/**
2250 * dwc2_hsotg_rx_data - receive data from the FIFO for an endpoint
2251 * @hsotg: The device state.
2252 * @ep_idx: The endpoint index for the data
2253 * @size: The size of data in the fifo, in bytes
2254 *
2255 * The FIFO status shows there is data to read from the FIFO for a given
2256 * endpoint, so sort out whether we need to read the data into a request
2257 * that has been made for that endpoint.
2258 */
2259static void dwc2_hsotg_rx_data(struct dwc2_hsotg *hsotg, int ep_idx, int size)
2260{
2261 struct dwc2_hsotg_ep *hs_ep = hsotg->eps_out[ep_idx];
2262 struct dwc2_hsotg_req *hs_req = hs_ep->req;
2263 int to_read;
2264 int max_req;
2265 int read_ptr;
2266
2267 if (!hs_req) {
2268 u32 epctl = dwc2_readl(hsotg, DOEPCTL(ep_idx));
2269 int ptr;
2270
2271 dev_dbg(hsotg->dev,
2272 "%s: FIFO %d bytes on ep%d but no req (DXEPCTl=0x%08x)\n",
2273 __func__, size, ep_idx, epctl);
2274
2275 /* dump the data from the FIFO, we've nothing we can do */
2276 for (ptr = 0; ptr < size; ptr += 4)
2277 (void)dwc2_readl(hsotg, EPFIFO(ep_idx));
2278
2279 return;
2280 }
2281
2282 to_read = size;
2283 read_ptr = hs_req->req.actual;
2284 max_req = hs_req->req.length - read_ptr;
2285
2286 dev_dbg(hsotg->dev, "%s: read %d/%d, done %d/%d\n",
2287 __func__, to_read, max_req, read_ptr, hs_req->req.length);
2288
2289 if (to_read > max_req) {
2290 /*
2291 * more data appeared than we where willing
2292 * to deal with in this request.
2293 */
2294
2295 /* currently we don't deal this */
2296 WARN_ON_ONCE(1);
2297 }
2298
2299 hs_ep->total_data += to_read;
2300 hs_req->req.actual += to_read;
2301 to_read = DIV_ROUND_UP(to_read, 4);
2302
2303 /*
2304 * note, we might over-write the buffer end by 3 bytes depending on
2305 * alignment of the data.
2306 */
2307 dwc2_readl_rep(hsotg, EPFIFO(ep_idx),
2308 hs_req->req.buf + read_ptr, to_read);
2309}
2310
2311/**
2312 * dwc2_hsotg_ep0_zlp - send/receive zero-length packet on control endpoint
2313 * @hsotg: The device instance
2314 * @dir_in: If IN zlp
2315 *
2316 * Generate a zero-length IN packet request for terminating a SETUP
2317 * transaction.
2318 *
2319 * Note, since we don't write any data to the TxFIFO, then it is
2320 * currently believed that we do not need to wait for any space in
2321 * the TxFIFO.
2322 */
2323static void dwc2_hsotg_ep0_zlp(struct dwc2_hsotg *hsotg, bool dir_in)
2324{
2325 /* eps_out[0] is used in both directions */
2326 hsotg->eps_out[0]->dir_in = dir_in;
2327 hsotg->ep0_state = dir_in ? DWC2_EP0_STATUS_IN : DWC2_EP0_STATUS_OUT;
2328
2329 dwc2_hsotg_program_zlp(hsotg, hsotg->eps_out[0]);
2330}
2331
2332/*
2333 * dwc2_gadget_get_xfersize_ddma - get transferred bytes amount from desc
2334 * @hs_ep - The endpoint on which transfer went
2335 *
2336 * Iterate over endpoints descriptor chain and get info on bytes remained
2337 * in DMA descriptors after transfer has completed. Used for non isoc EPs.
2338 */
2339static unsigned int dwc2_gadget_get_xfersize_ddma(struct dwc2_hsotg_ep *hs_ep)
2340{
2341 const struct usb_endpoint_descriptor *ep_desc = hs_ep->ep.desc;
2342 struct dwc2_hsotg *hsotg = hs_ep->parent;
2343 unsigned int bytes_rem = 0;
2344 unsigned int bytes_rem_correction = 0;
2345 struct dwc2_dma_desc *desc = hs_ep->desc_list;
2346 int i;
2347 u32 status;
2348 u32 mps = hs_ep->ep.maxpacket;
2349 int dir_in = hs_ep->dir_in;
2350
2351 if (!desc)
2352 return -EINVAL;
2353
2354 /* Interrupt OUT EP with mps not multiple of 4 */
2355 if (hs_ep->index)
2356 if (usb_endpoint_xfer_int(ep_desc) && !dir_in && (mps % 4))
2357 bytes_rem_correction = 4 - (mps % 4);
2358
2359 for (i = 0; i < hs_ep->desc_count; ++i) {
2360 status = desc->status;
2361 bytes_rem += status & DEV_DMA_NBYTES_MASK;
2362 bytes_rem -= bytes_rem_correction;
2363
2364 if (status & DEV_DMA_STS_MASK)
2365 dev_err(hsotg->dev, "descriptor %d closed with %x\n",
2366 i, status & DEV_DMA_STS_MASK);
2367
2368 if (status & DEV_DMA_L)
2369 break;
2370
2371 desc++;
2372 }
2373
2374 return bytes_rem;
2375}
2376
2377/**
2378 * dwc2_hsotg_handle_outdone - handle receiving OutDone/SetupDone from RXFIFO
2379 * @hsotg: The device instance
2380 * @epnum: The endpoint received from
2381 *
2382 * The RXFIFO has delivered an OutDone event, which means that the data
2383 * transfer for an OUT endpoint has been completed, either by a short
2384 * packet or by the finish of a transfer.
2385 */
2386static void dwc2_hsotg_handle_outdone(struct dwc2_hsotg *hsotg, int epnum)
2387{
2388 u32 epsize = dwc2_readl(hsotg, DOEPTSIZ(epnum));
2389 struct dwc2_hsotg_ep *hs_ep = hsotg->eps_out[epnum];
2390 struct dwc2_hsotg_req *hs_req = hs_ep->req;
2391 struct usb_request *req = &hs_req->req;
2392 unsigned int size_left = DXEPTSIZ_XFERSIZE_GET(epsize);
2393 int result = 0;
2394
2395 if (!hs_req) {
2396 dev_dbg(hsotg->dev, "%s: no request active\n", __func__);
2397 return;
2398 }
2399
2400 if (epnum == 0 && hsotg->ep0_state == DWC2_EP0_STATUS_OUT) {
2401 dev_dbg(hsotg->dev, "zlp packet received\n");
2402 dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
2403 dwc2_hsotg_enqueue_setup(hsotg);
2404 return;
2405 }
2406
2407 if (using_desc_dma(hsotg))
2408 size_left = dwc2_gadget_get_xfersize_ddma(hs_ep);
2409
2410 if (using_dma(hsotg)) {
2411 unsigned int size_done;
2412
2413 /*
2414 * Calculate the size of the transfer by checking how much
2415 * is left in the endpoint size register and then working it
2416 * out from the amount we loaded for the transfer.
2417 *
2418 * We need to do this as DMA pointers are always 32bit aligned
2419 * so may overshoot/undershoot the transfer.
2420 */
2421
2422 size_done = hs_ep->size_loaded - size_left;
2423 size_done += hs_ep->last_load;
2424
2425 req->actual = size_done;
2426 }
2427
2428 /* if there is more request to do, schedule new transfer */
2429 if (req->actual < req->length && size_left == 0) {
2430 dwc2_hsotg_start_req(hsotg, hs_ep, hs_req, true);
2431 return;
2432 }
2433
2434 if (req->actual < req->length && req->short_not_ok) {
2435 dev_dbg(hsotg->dev, "%s: got %d/%d (short not ok) => error\n",
2436 __func__, req->actual, req->length);
2437
2438 /*
2439 * todo - what should we return here? there's no one else
2440 * even bothering to check the status.
2441 */
2442 }
2443
2444 /* DDMA IN status phase will start from StsPhseRcvd interrupt */
2445 if (!using_desc_dma(hsotg) && epnum == 0 &&
2446 hsotg->ep0_state == DWC2_EP0_DATA_OUT) {
2447 /* Move to STATUS IN */
2448 if (!hsotg->delayed_status)
2449 dwc2_hsotg_ep0_zlp(hsotg, true);
2450 }
2451
2452 /* Set actual frame number for completed transfers */
2453 if (!using_desc_dma(hsotg) && hs_ep->isochronous) {
2454 req->frame_number = hs_ep->target_frame;
2455 dwc2_gadget_incr_frame_num(hs_ep);
2456 }
2457
2458 dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, result);
2459}
2460
2461/**
2462 * dwc2_hsotg_handle_rx - RX FIFO has data
2463 * @hsotg: The device instance
2464 *
2465 * The IRQ handler has detected that the RX FIFO has some data in it
2466 * that requires processing, so find out what is in there and do the
2467 * appropriate read.
2468 *
2469 * The RXFIFO is a true FIFO, the packets coming out are still in packet
2470 * chunks, so if you have x packets received on an endpoint you'll get x
2471 * FIFO events delivered, each with a packet's worth of data in it.
2472 *
2473 * When using DMA, we should not be processing events from the RXFIFO
2474 * as the actual data should be sent to the memory directly and we turn
2475 * on the completion interrupts to get notifications of transfer completion.
2476 */
2477static void dwc2_hsotg_handle_rx(struct dwc2_hsotg *hsotg)
2478{
2479 u32 grxstsr = dwc2_readl(hsotg, GRXSTSP);
2480 u32 epnum, status, size;
2481
2482 WARN_ON(using_dma(hsotg));
2483
2484 epnum = grxstsr & GRXSTS_EPNUM_MASK;
2485 status = grxstsr & GRXSTS_PKTSTS_MASK;
2486
2487 size = grxstsr & GRXSTS_BYTECNT_MASK;
2488 size >>= GRXSTS_BYTECNT_SHIFT;
2489
2490 dev_dbg(hsotg->dev, "%s: GRXSTSP=0x%08x (%d@%d)\n",
2491 __func__, grxstsr, size, epnum);
2492
2493 switch ((status & GRXSTS_PKTSTS_MASK) >> GRXSTS_PKTSTS_SHIFT) {
2494 case GRXSTS_PKTSTS_GLOBALOUTNAK:
2495 dev_dbg(hsotg->dev, "GLOBALOUTNAK\n");
2496 break;
2497
2498 case GRXSTS_PKTSTS_OUTDONE:
2499 dev_dbg(hsotg->dev, "OutDone (Frame=0x%08x)\n",
2500 dwc2_hsotg_read_frameno(hsotg));
2501
2502 if (!using_dma(hsotg))
2503 dwc2_hsotg_handle_outdone(hsotg, epnum);
2504 break;
2505
2506 case GRXSTS_PKTSTS_SETUPDONE:
2507 dev_dbg(hsotg->dev,
2508 "SetupDone (Frame=0x%08x, DOPEPCTL=0x%08x)\n",
2509 dwc2_hsotg_read_frameno(hsotg),
2510 dwc2_readl(hsotg, DOEPCTL(0)));
2511 /*
2512 * Call dwc2_hsotg_handle_outdone here if it was not called from
2513 * GRXSTS_PKTSTS_OUTDONE. That is, if the core didn't
2514 * generate GRXSTS_PKTSTS_OUTDONE for setup packet.
2515 */
2516 if (hsotg->ep0_state == DWC2_EP0_SETUP)
2517 dwc2_hsotg_handle_outdone(hsotg, epnum);
2518 break;
2519
2520 case GRXSTS_PKTSTS_OUTRX:
2521 dwc2_hsotg_rx_data(hsotg, epnum, size);
2522 break;
2523
2524 case GRXSTS_PKTSTS_SETUPRX:
2525 dev_dbg(hsotg->dev,
2526 "SetupRX (Frame=0x%08x, DOPEPCTL=0x%08x)\n",
2527 dwc2_hsotg_read_frameno(hsotg),
2528 dwc2_readl(hsotg, DOEPCTL(0)));
2529
2530 WARN_ON(hsotg->ep0_state != DWC2_EP0_SETUP);
2531
2532 dwc2_hsotg_rx_data(hsotg, epnum, size);
2533 break;
2534
2535 default:
2536 dev_warn(hsotg->dev, "%s: unknown status %08x\n",
2537 __func__, grxstsr);
2538
2539 dwc2_hsotg_dump(hsotg);
2540 break;
2541 }
2542}
2543
2544/**
2545 * dwc2_hsotg_ep0_mps - turn max packet size into register setting
2546 * @mps: The maximum packet size in bytes.
2547 */
2548static u32 dwc2_hsotg_ep0_mps(unsigned int mps)
2549{
2550 switch (mps) {
2551 case 64:
2552 return D0EPCTL_MPS_64;
2553 case 32:
2554 return D0EPCTL_MPS_32;
2555 case 16:
2556 return D0EPCTL_MPS_16;
2557 case 8:
2558 return D0EPCTL_MPS_8;
2559 }
2560
2561 /* bad max packet size, warn and return invalid result */
2562 WARN_ON(1);
2563 return (u32)-1;
2564}
2565
2566/**
2567 * dwc2_hsotg_set_ep_maxpacket - set endpoint's max-packet field
2568 * @hsotg: The driver state.
2569 * @ep: The index number of the endpoint
2570 * @mps: The maximum packet size in bytes
2571 * @mc: The multicount value
2572 * @dir_in: True if direction is in.
2573 *
2574 * Configure the maximum packet size for the given endpoint, updating
2575 * the hardware control registers to reflect this.
2576 */
2577static void dwc2_hsotg_set_ep_maxpacket(struct dwc2_hsotg *hsotg,
2578 unsigned int ep, unsigned int mps,
2579 unsigned int mc, unsigned int dir_in)
2580{
2581 struct dwc2_hsotg_ep *hs_ep;
2582 u32 reg;
2583
2584 hs_ep = index_to_ep(hsotg, ep, dir_in);
2585 if (!hs_ep)
2586 return;
2587
2588 if (ep == 0) {
2589 u32 mps_bytes = mps;
2590
2591 /* EP0 is a special case */
2592 mps = dwc2_hsotg_ep0_mps(mps_bytes);
2593 if (mps > 3)
2594 goto bad_mps;
2595 hs_ep->ep.maxpacket = mps_bytes;
2596 hs_ep->mc = 1;
2597 } else {
2598 if (mps > 1024)
2599 goto bad_mps;
2600 hs_ep->mc = mc;
2601 if (mc > 3)
2602 goto bad_mps;
2603 hs_ep->ep.maxpacket = mps;
2604 }
2605
2606 if (dir_in) {
2607 reg = dwc2_readl(hsotg, DIEPCTL(ep));
2608 reg &= ~DXEPCTL_MPS_MASK;
2609 reg |= mps;
2610 dwc2_writel(hsotg, reg, DIEPCTL(ep));
2611 } else {
2612 reg = dwc2_readl(hsotg, DOEPCTL(ep));
2613 reg &= ~DXEPCTL_MPS_MASK;
2614 reg |= mps;
2615 dwc2_writel(hsotg, reg, DOEPCTL(ep));
2616 }
2617
2618 return;
2619
2620bad_mps:
2621 dev_err(hsotg->dev, "ep%d: bad mps of %d\n", ep, mps);
2622}
2623
2624/**
2625 * dwc2_hsotg_txfifo_flush - flush Tx FIFO
2626 * @hsotg: The driver state
2627 * @idx: The index for the endpoint (0..15)
2628 */
2629static void dwc2_hsotg_txfifo_flush(struct dwc2_hsotg *hsotg, unsigned int idx)
2630{
2631 dwc2_writel(hsotg, GRSTCTL_TXFNUM(idx) | GRSTCTL_TXFFLSH,
2632 GRSTCTL);
2633
2634 /* wait until the fifo is flushed */
2635 if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_TXFFLSH, 100))
2636 dev_warn(hsotg->dev, "%s: timeout flushing fifo GRSTCTL_TXFFLSH\n",
2637 __func__);
2638}
2639
2640/**
2641 * dwc2_hsotg_trytx - check to see if anything needs transmitting
2642 * @hsotg: The driver state
2643 * @hs_ep: The driver endpoint to check.
2644 *
2645 * Check to see if there is a request that has data to send, and if so
2646 * make an attempt to write data into the FIFO.
2647 */
2648static int dwc2_hsotg_trytx(struct dwc2_hsotg *hsotg,
2649 struct dwc2_hsotg_ep *hs_ep)
2650{
2651 struct dwc2_hsotg_req *hs_req = hs_ep->req;
2652
2653 if (!hs_ep->dir_in || !hs_req) {
2654 /**
2655 * if request is not enqueued, we disable interrupts
2656 * for endpoints, excepting ep0
2657 */
2658 if (hs_ep->index != 0)
2659 dwc2_hsotg_ctrl_epint(hsotg, hs_ep->index,
2660 hs_ep->dir_in, 0);
2661 return 0;
2662 }
2663
2664 if (hs_req->req.actual < hs_req->req.length) {
2665 dev_dbg(hsotg->dev, "trying to write more for ep%d\n",
2666 hs_ep->index);
2667 return dwc2_hsotg_write_fifo(hsotg, hs_ep, hs_req);
2668 }
2669
2670 return 0;
2671}
2672
2673/**
2674 * dwc2_hsotg_complete_in - complete IN transfer
2675 * @hsotg: The device state.
2676 * @hs_ep: The endpoint that has just completed.
2677 *
2678 * An IN transfer has been completed, update the transfer's state and then
2679 * call the relevant completion routines.
2680 */
2681static void dwc2_hsotg_complete_in(struct dwc2_hsotg *hsotg,
2682 struct dwc2_hsotg_ep *hs_ep)
2683{
2684 struct dwc2_hsotg_req *hs_req = hs_ep->req;
2685 u32 epsize = dwc2_readl(hsotg, DIEPTSIZ(hs_ep->index));
2686 int size_left, size_done;
2687
2688 if (!hs_req) {
2689 dev_dbg(hsotg->dev, "XferCompl but no req\n");
2690 return;
2691 }
2692
2693 /* Finish ZLP handling for IN EP0 transactions */
2694 if (hs_ep->index == 0 && hsotg->ep0_state == DWC2_EP0_STATUS_IN) {
2695 dev_dbg(hsotg->dev, "zlp packet sent\n");
2696
2697 /*
2698 * While send zlp for DWC2_EP0_STATUS_IN EP direction was
2699 * changed to IN. Change back to complete OUT transfer request
2700 */
2701 hs_ep->dir_in = 0;
2702
2703 dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
2704 if (hsotg->test_mode) {
2705 int ret;
2706
2707 ret = dwc2_hsotg_set_test_mode(hsotg, hsotg->test_mode);
2708 if (ret < 0) {
2709 dev_dbg(hsotg->dev, "Invalid Test #%d\n",
2710 hsotg->test_mode);
2711 dwc2_hsotg_stall_ep0(hsotg);
2712 return;
2713 }
2714 }
2715 dwc2_hsotg_enqueue_setup(hsotg);
2716 return;
2717 }
2718
2719 /*
2720 * Calculate the size of the transfer by checking how much is left
2721 * in the endpoint size register and then working it out from
2722 * the amount we loaded for the transfer.
2723 *
2724 * We do this even for DMA, as the transfer may have incremented
2725 * past the end of the buffer (DMA transfers are always 32bit
2726 * aligned).
2727 */
2728 if (using_desc_dma(hsotg)) {
2729 size_left = dwc2_gadget_get_xfersize_ddma(hs_ep);
2730 if (size_left < 0)
2731 dev_err(hsotg->dev, "error parsing DDMA results %d\n",
2732 size_left);
2733 } else {
2734 size_left = DXEPTSIZ_XFERSIZE_GET(epsize);
2735 }
2736
2737 size_done = hs_ep->size_loaded - size_left;
2738 size_done += hs_ep->last_load;
2739
2740 if (hs_req->req.actual != size_done)
2741 dev_dbg(hsotg->dev, "%s: adjusting size done %d => %d\n",
2742 __func__, hs_req->req.actual, size_done);
2743
2744 hs_req->req.actual = size_done;
2745 dev_dbg(hsotg->dev, "req->length:%d req->actual:%d req->zero:%d\n",
2746 hs_req->req.length, hs_req->req.actual, hs_req->req.zero);
2747
2748 if (!size_left && hs_req->req.actual < hs_req->req.length) {
2749 dev_dbg(hsotg->dev, "%s trying more for req...\n", __func__);
2750 dwc2_hsotg_start_req(hsotg, hs_ep, hs_req, true);
2751 return;
2752 }
2753
2754 /* Zlp for all endpoints in non DDMA, for ep0 only in DATA IN stage */
2755 if (hs_ep->send_zlp) {
2756 hs_ep->send_zlp = 0;
2757 if (!using_desc_dma(hsotg)) {
2758 dwc2_hsotg_program_zlp(hsotg, hs_ep);
2759 /* transfer will be completed on next complete interrupt */
2760 return;
2761 }
2762 }
2763
2764 if (hs_ep->index == 0 && hsotg->ep0_state == DWC2_EP0_DATA_IN) {
2765 /* Move to STATUS OUT */
2766 dwc2_hsotg_ep0_zlp(hsotg, false);
2767 return;
2768 }
2769
2770 /* Set actual frame number for completed transfers */
2771 if (!using_desc_dma(hsotg) && hs_ep->isochronous) {
2772 hs_req->req.frame_number = hs_ep->target_frame;
2773 dwc2_gadget_incr_frame_num(hs_ep);
2774 }
2775
2776 dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);
2777}
2778
2779/**
2780 * dwc2_gadget_read_ep_interrupts - reads interrupts for given ep
2781 * @hsotg: The device state.
2782 * @idx: Index of ep.
2783 * @dir_in: Endpoint direction 1-in 0-out.
2784 *
2785 * Reads for endpoint with given index and direction, by masking
2786 * epint_reg with coresponding mask.
2787 */
2788static u32 dwc2_gadget_read_ep_interrupts(struct dwc2_hsotg *hsotg,
2789 unsigned int idx, int dir_in)
2790{
2791 u32 epmsk_reg = dir_in ? DIEPMSK : DOEPMSK;
2792 u32 epint_reg = dir_in ? DIEPINT(idx) : DOEPINT(idx);
2793 u32 ints;
2794 u32 mask;
2795 u32 diepempmsk;
2796
2797 mask = dwc2_readl(hsotg, epmsk_reg);
2798 diepempmsk = dwc2_readl(hsotg, DIEPEMPMSK);
2799 mask |= ((diepempmsk >> idx) & 0x1) ? DIEPMSK_TXFIFOEMPTY : 0;
2800 mask |= DXEPINT_SETUP_RCVD;
2801
2802 ints = dwc2_readl(hsotg, epint_reg);
2803 ints &= mask;
2804 return ints;
2805}
2806
2807/**
2808 * dwc2_gadget_handle_ep_disabled - handle DXEPINT_EPDISBLD
2809 * @hs_ep: The endpoint on which interrupt is asserted.
2810 *
2811 * This interrupt indicates that the endpoint has been disabled per the
2812 * application's request.
2813 *
2814 * For IN endpoints flushes txfifo, in case of BULK clears DCTL_CGNPINNAK,
2815 * in case of ISOC completes current request.
2816 *
2817 * For ISOC-OUT endpoints completes expired requests. If there is remaining
2818 * request starts it.
2819 */
2820static void dwc2_gadget_handle_ep_disabled(struct dwc2_hsotg_ep *hs_ep)
2821{
2822 struct dwc2_hsotg *hsotg = hs_ep->parent;
2823 struct dwc2_hsotg_req *hs_req;
2824 unsigned char idx = hs_ep->index;
2825 int dir_in = hs_ep->dir_in;
2826 u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx);
2827 int dctl = dwc2_readl(hsotg, DCTL);
2828
2829 dev_dbg(hsotg->dev, "%s: EPDisbld\n", __func__);
2830
2831 if (dir_in) {
2832 int epctl = dwc2_readl(hsotg, epctl_reg);
2833
2834 dwc2_hsotg_txfifo_flush(hsotg, hs_ep->fifo_index);
2835
2836 if ((epctl & DXEPCTL_STALL) && (epctl & DXEPCTL_EPTYPE_BULK)) {
2837 int dctl = dwc2_readl(hsotg, DCTL);
2838
2839 dctl |= DCTL_CGNPINNAK;
2840 dwc2_writel(hsotg, dctl, DCTL);
2841 }
2842 } else {
2843
2844 if (dctl & DCTL_GOUTNAKSTS) {
2845 dctl |= DCTL_CGOUTNAK;
2846 dwc2_writel(hsotg, dctl, DCTL);
2847 }
2848 }
2849
2850 if (!hs_ep->isochronous)
2851 return;
2852
2853 if (list_empty(&hs_ep->queue)) {
2854 dev_dbg(hsotg->dev, "%s: complete_ep 0x%p, ep->queue empty!\n",
2855 __func__, hs_ep);
2856 return;
2857 }
2858
2859 do {
2860 hs_req = get_ep_head(hs_ep);
2861 if (hs_req) {
2862 hs_req->req.frame_number = hs_ep->target_frame;
2863 hs_req->req.actual = 0;
2864 dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req,
2865 -ENODATA);
2866 }
2867 dwc2_gadget_incr_frame_num(hs_ep);
2868 /* Update current frame number value. */
2869 hsotg->frame_number = dwc2_hsotg_read_frameno(hsotg);
2870 } while (dwc2_gadget_target_frame_elapsed(hs_ep));
2871}
2872
2873/**
2874 * dwc2_gadget_handle_out_token_ep_disabled - handle DXEPINT_OUTTKNEPDIS
2875 * @ep: The endpoint on which interrupt is asserted.
2876 *
2877 * This is starting point for ISOC-OUT transfer, synchronization done with
2878 * first out token received from host while corresponding EP is disabled.
2879 *
2880 * Device does not know initial frame in which out token will come. For this
2881 * HW generates OUTTKNEPDIS - out token is received while EP is disabled. Upon
2882 * getting this interrupt SW starts calculation for next transfer frame.
2883 */
2884static void dwc2_gadget_handle_out_token_ep_disabled(struct dwc2_hsotg_ep *ep)
2885{
2886 struct dwc2_hsotg *hsotg = ep->parent;
2887 struct dwc2_hsotg_req *hs_req;
2888 int dir_in = ep->dir_in;
2889
2890 if (dir_in || !ep->isochronous)
2891 return;
2892
2893 if (using_desc_dma(hsotg)) {
2894 if (ep->target_frame == TARGET_FRAME_INITIAL) {
2895 /* Start first ISO Out */
2896 ep->target_frame = hsotg->frame_number;
2897 dwc2_gadget_start_isoc_ddma(ep);
2898 }
2899 return;
2900 }
2901
2902 if (ep->target_frame == TARGET_FRAME_INITIAL) {
2903 u32 ctrl;
2904
2905 ep->target_frame = hsotg->frame_number;
2906 if (ep->interval > 1) {
2907 ctrl = dwc2_readl(hsotg, DOEPCTL(ep->index));
2908 if (ep->target_frame & 0x1)
2909 ctrl |= DXEPCTL_SETODDFR;
2910 else
2911 ctrl |= DXEPCTL_SETEVENFR;
2912
2913 dwc2_writel(hsotg, ctrl, DOEPCTL(ep->index));
2914 }
2915 }
2916
2917 while (dwc2_gadget_target_frame_elapsed(ep)) {
2918 hs_req = get_ep_head(ep);
2919 if (hs_req) {
2920 hs_req->req.frame_number = ep->target_frame;
2921 hs_req->req.actual = 0;
2922 dwc2_hsotg_complete_request(hsotg, ep, hs_req, -ENODATA);
2923 }
2924
2925 dwc2_gadget_incr_frame_num(ep);
2926 /* Update current frame number value. */
2927 hsotg->frame_number = dwc2_hsotg_read_frameno(hsotg);
2928 }
2929
2930 if (!ep->req)
2931 dwc2_gadget_start_next_request(ep);
2932
2933}
2934
2935static void dwc2_hsotg_ep_stop_xfr(struct dwc2_hsotg *hsotg,
2936 struct dwc2_hsotg_ep *hs_ep);
2937
2938/**
2939 * dwc2_gadget_handle_nak - handle NAK interrupt
2940 * @hs_ep: The endpoint on which interrupt is asserted.
2941 *
2942 * This is starting point for ISOC-IN transfer, synchronization done with
2943 * first IN token received from host while corresponding EP is disabled.
2944 *
2945 * Device does not know when first one token will arrive from host. On first
2946 * token arrival HW generates 2 interrupts: 'in token received while FIFO empty'
2947 * and 'NAK'. NAK interrupt for ISOC-IN means that token has arrived and ZLP was
2948 * sent in response to that as there was no data in FIFO. SW is basing on this
2949 * interrupt to obtain frame in which token has come and then based on the
2950 * interval calculates next frame for transfer.
2951 */
2952static void dwc2_gadget_handle_nak(struct dwc2_hsotg_ep *hs_ep)
2953{
2954 struct dwc2_hsotg *hsotg = hs_ep->parent;
2955 struct dwc2_hsotg_req *hs_req;
2956 int dir_in = hs_ep->dir_in;
2957 u32 ctrl;
2958
2959 if (!dir_in || !hs_ep->isochronous)
2960 return;
2961
2962 if (hs_ep->target_frame == TARGET_FRAME_INITIAL) {
2963
2964 if (using_desc_dma(hsotg)) {
2965 hs_ep->target_frame = hsotg->frame_number;
2966 dwc2_gadget_incr_frame_num(hs_ep);
2967
2968 /* In service interval mode target_frame must
2969 * be set to last (u)frame of the service interval.
2970 */
2971 if (hsotg->params.service_interval) {
2972 /* Set target_frame to the first (u)frame of
2973 * the service interval
2974 */
2975 hs_ep->target_frame &= ~hs_ep->interval + 1;
2976
2977 /* Set target_frame to the last (u)frame of
2978 * the service interval
2979 */
2980 dwc2_gadget_incr_frame_num(hs_ep);
2981 dwc2_gadget_dec_frame_num_by_one(hs_ep);
2982 }
2983
2984 dwc2_gadget_start_isoc_ddma(hs_ep);
2985 return;
2986 }
2987
2988 hs_ep->target_frame = hsotg->frame_number;
2989 if (hs_ep->interval > 1) {
2990 u32 ctrl = dwc2_readl(hsotg,
2991 DIEPCTL(hs_ep->index));
2992 if (hs_ep->target_frame & 0x1)
2993 ctrl |= DXEPCTL_SETODDFR;
2994 else
2995 ctrl |= DXEPCTL_SETEVENFR;
2996
2997 dwc2_writel(hsotg, ctrl, DIEPCTL(hs_ep->index));
2998 }
2999 }
3000
3001 if (using_desc_dma(hsotg))
3002 return;
3003
3004 ctrl = dwc2_readl(hsotg, DIEPCTL(hs_ep->index));
3005 if (ctrl & DXEPCTL_EPENA)
3006 dwc2_hsotg_ep_stop_xfr(hsotg, hs_ep);
3007 else
3008 dwc2_hsotg_txfifo_flush(hsotg, hs_ep->fifo_index);
3009
3010 while (dwc2_gadget_target_frame_elapsed(hs_ep)) {
3011 hs_req = get_ep_head(hs_ep);
3012 if (hs_req) {
3013 hs_req->req.frame_number = hs_ep->target_frame;
3014 hs_req->req.actual = 0;
3015 dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, -ENODATA);
3016 }
3017
3018 dwc2_gadget_incr_frame_num(hs_ep);
3019 /* Update current frame number value. */
3020 hsotg->frame_number = dwc2_hsotg_read_frameno(hsotg);
3021 }
3022
3023 if (!hs_ep->req)
3024 dwc2_gadget_start_next_request(hs_ep);
3025}
3026
3027/**
3028 * dwc2_hsotg_epint - handle an in/out endpoint interrupt
3029 * @hsotg: The driver state
3030 * @idx: The index for the endpoint (0..15)
3031 * @dir_in: Set if this is an IN endpoint
3032 *
3033 * Process and clear any interrupt pending for an individual endpoint
3034 */
3035static void dwc2_hsotg_epint(struct dwc2_hsotg *hsotg, unsigned int idx,
3036 int dir_in)
3037{
3038 struct dwc2_hsotg_ep *hs_ep = index_to_ep(hsotg, idx, dir_in);
3039 u32 epint_reg = dir_in ? DIEPINT(idx) : DOEPINT(idx);
3040 u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx);
3041 u32 epsiz_reg = dir_in ? DIEPTSIZ(idx) : DOEPTSIZ(idx);
3042 u32 ints;
3043
3044 ints = dwc2_gadget_read_ep_interrupts(hsotg, idx, dir_in);
3045
3046 /* Clear endpoint interrupts */
3047 dwc2_writel(hsotg, ints, epint_reg);
3048
3049 if (!hs_ep) {
3050 dev_err(hsotg->dev, "%s:Interrupt for unconfigured ep%d(%s)\n",
3051 __func__, idx, dir_in ? "in" : "out");
3052 return;
3053 }
3054
3055 dev_dbg(hsotg->dev, "%s: ep%d(%s) DxEPINT=0x%08x\n",
3056 __func__, idx, dir_in ? "in" : "out", ints);
3057
3058 /* Don't process XferCompl interrupt if it is a setup packet */
3059 if (idx == 0 && (ints & (DXEPINT_SETUP | DXEPINT_SETUP_RCVD)))
3060 ints &= ~DXEPINT_XFERCOMPL;
3061
3062 /*
3063 * Don't process XferCompl interrupt in DDMA if EP0 is still in SETUP
3064 * stage and xfercomplete was generated without SETUP phase done
3065 * interrupt. SW should parse received setup packet only after host's
3066 * exit from setup phase of control transfer.
3067 */
3068 if (using_desc_dma(hsotg) && idx == 0 && !hs_ep->dir_in &&
3069 hsotg->ep0_state == DWC2_EP0_SETUP && !(ints & DXEPINT_SETUP))
3070 ints &= ~DXEPINT_XFERCOMPL;
3071
3072 if (ints & DXEPINT_XFERCOMPL) {
3073 dev_dbg(hsotg->dev,
3074 "%s: XferCompl: DxEPCTL=0x%08x, DXEPTSIZ=%08x\n",
3075 __func__, dwc2_readl(hsotg, epctl_reg),
3076 dwc2_readl(hsotg, epsiz_reg));
3077
3078 /* In DDMA handle isochronous requests separately */
3079 if (using_desc_dma(hsotg) && hs_ep->isochronous) {
3080 dwc2_gadget_complete_isoc_request_ddma(hs_ep);
3081 } else if (dir_in) {
3082 /*
3083 * We get OutDone from the FIFO, so we only
3084 * need to look at completing IN requests here
3085 * if operating slave mode
3086 */
3087 if (!hs_ep->isochronous || !(ints & DXEPINT_NAKINTRPT))
3088 dwc2_hsotg_complete_in(hsotg, hs_ep);
3089
3090 if (idx == 0 && !hs_ep->req)
3091 dwc2_hsotg_enqueue_setup(hsotg);
3092 } else if (using_dma(hsotg)) {
3093 /*
3094 * We're using DMA, we need to fire an OutDone here
3095 * as we ignore the RXFIFO.
3096 */
3097 if (!hs_ep->isochronous || !(ints & DXEPINT_OUTTKNEPDIS))
3098 dwc2_hsotg_handle_outdone(hsotg, idx);
3099 }
3100 }
3101
3102 if (ints & DXEPINT_EPDISBLD)
3103 dwc2_gadget_handle_ep_disabled(hs_ep);
3104
3105 if (ints & DXEPINT_OUTTKNEPDIS)
3106 dwc2_gadget_handle_out_token_ep_disabled(hs_ep);
3107
3108 if (ints & DXEPINT_NAKINTRPT)
3109 dwc2_gadget_handle_nak(hs_ep);
3110
3111 if (ints & DXEPINT_AHBERR)
3112 dev_dbg(hsotg->dev, "%s: AHBErr\n", __func__);
3113
3114 if (ints & DXEPINT_SETUP) { /* Setup or Timeout */
3115 dev_dbg(hsotg->dev, "%s: Setup/Timeout\n", __func__);
3116
3117 if (using_dma(hsotg) && idx == 0) {
3118 /*
3119 * this is the notification we've received a
3120 * setup packet. In non-DMA mode we'd get this
3121 * from the RXFIFO, instead we need to process
3122 * the setup here.
3123 */
3124
3125 if (dir_in)
3126 WARN_ON_ONCE(1);
3127 else
3128 dwc2_hsotg_handle_outdone(hsotg, 0);
3129 }
3130 }
3131
3132 if (ints & DXEPINT_STSPHSERCVD) {
3133 dev_dbg(hsotg->dev, "%s: StsPhseRcvd\n", __func__);
3134
3135 /* Safety check EP0 state when STSPHSERCVD asserted */
3136 if (hsotg->ep0_state == DWC2_EP0_DATA_OUT) {
3137 /* Move to STATUS IN for DDMA */
3138 if (using_desc_dma(hsotg)) {
3139 if (!hsotg->delayed_status)
3140 dwc2_hsotg_ep0_zlp(hsotg, true);
3141 else
3142 /* In case of 3 stage Control Write with delayed
3143 * status, when Status IN transfer started
3144 * before STSPHSERCVD asserted, NAKSTS bit not
3145 * cleared by CNAK in dwc2_hsotg_start_req()
3146 * function. Clear now NAKSTS to allow complete
3147 * transfer.
3148 */
3149 dwc2_set_bit(hsotg, DIEPCTL(0),
3150 DXEPCTL_CNAK);
3151 }
3152 }
3153
3154 }
3155
3156 if (ints & DXEPINT_BACK2BACKSETUP)
3157 dev_dbg(hsotg->dev, "%s: B2BSetup/INEPNakEff\n", __func__);
3158
3159 if (ints & DXEPINT_BNAINTR) {
3160 dev_dbg(hsotg->dev, "%s: BNA interrupt\n", __func__);
3161 if (hs_ep->isochronous)
3162 dwc2_gadget_handle_isoc_bna(hs_ep);
3163 }
3164
3165 if (dir_in && !hs_ep->isochronous) {
3166 /* not sure if this is important, but we'll clear it anyway */
3167 if (ints & DXEPINT_INTKNTXFEMP) {
3168 dev_dbg(hsotg->dev, "%s: ep%d: INTknTXFEmpMsk\n",
3169 __func__, idx);
3170 }
3171
3172 /* this probably means something bad is happening */
3173 if (ints & DXEPINT_INTKNEPMIS) {
3174 dev_warn(hsotg->dev, "%s: ep%d: INTknEP\n",
3175 __func__, idx);
3176 }
3177
3178 /* FIFO has space or is empty (see GAHBCFG) */
3179 if (hsotg->dedicated_fifos &&
3180 ints & DXEPINT_TXFEMP) {
3181 dev_dbg(hsotg->dev, "%s: ep%d: TxFIFOEmpty\n",
3182 __func__, idx);
3183 if (!using_dma(hsotg))
3184 dwc2_hsotg_trytx(hsotg, hs_ep);
3185 }
3186 }
3187}
3188
3189/**
3190 * dwc2_hsotg_irq_enumdone - Handle EnumDone interrupt (enumeration done)
3191 * @hsotg: The device state.
3192 *
3193 * Handle updating the device settings after the enumeration phase has
3194 * been completed.
3195 */
3196static void dwc2_hsotg_irq_enumdone(struct dwc2_hsotg *hsotg)
3197{
3198 u32 dsts = dwc2_readl(hsotg, DSTS);
3199 int ep0_mps = 0, ep_mps = 8;
3200
3201 /*
3202 * This should signal the finish of the enumeration phase
3203 * of the USB handshaking, so we should now know what rate
3204 * we connected at.
3205 */
3206
3207 dev_dbg(hsotg->dev, "EnumDone (DSTS=0x%08x)\n", dsts);
3208
3209 /*
3210 * note, since we're limited by the size of transfer on EP0, and
3211 * it seems IN transfers must be a even number of packets we do
3212 * not advertise a 64byte MPS on EP0.
3213 */
3214
3215 /* catch both EnumSpd_FS and EnumSpd_FS48 */
3216 switch ((dsts & DSTS_ENUMSPD_MASK) >> DSTS_ENUMSPD_SHIFT) {
3217 case DSTS_ENUMSPD_FS:
3218 case DSTS_ENUMSPD_FS48:
3219 hsotg->gadget.speed = USB_SPEED_FULL;
3220 ep0_mps = EP0_MPS_LIMIT;
3221 ep_mps = 1023;
3222 break;
3223
3224 case DSTS_ENUMSPD_HS:
3225 hsotg->gadget.speed = USB_SPEED_HIGH;
3226 ep0_mps = EP0_MPS_LIMIT;
3227 ep_mps = 1024;
3228 break;
3229
3230 case DSTS_ENUMSPD_LS:
3231 hsotg->gadget.speed = USB_SPEED_LOW;
3232 ep0_mps = 8;
3233 ep_mps = 8;
3234 /*
3235 * note, we don't actually support LS in this driver at the
3236 * moment, and the documentation seems to imply that it isn't
3237 * supported by the PHYs on some of the devices.
3238 */
3239 break;
3240 }
3241 dev_info(hsotg->dev, "new device is %s\n",
3242 usb_speed_string(hsotg->gadget.speed));
3243
3244 /*
3245 * we should now know the maximum packet size for an
3246 * endpoint, so set the endpoints to a default value.
3247 */
3248
3249 if (ep0_mps) {
3250 int i;
3251 /* Initialize ep0 for both in and out directions */
3252 dwc2_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps, 0, 1);
3253 dwc2_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps, 0, 0);
3254 for (i = 1; i < hsotg->num_of_eps; i++) {
3255 if (hsotg->eps_in[i])
3256 dwc2_hsotg_set_ep_maxpacket(hsotg, i, ep_mps,
3257 0, 1);
3258 if (hsotg->eps_out[i])
3259 dwc2_hsotg_set_ep_maxpacket(hsotg, i, ep_mps,
3260 0, 0);
3261 }
3262 }
3263
3264 /* ensure after enumeration our EP0 is active */
3265
3266 dwc2_hsotg_enqueue_setup(hsotg);
3267
3268 dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
3269 dwc2_readl(hsotg, DIEPCTL0),
3270 dwc2_readl(hsotg, DOEPCTL0));
3271}
3272
3273/**
3274 * kill_all_requests - remove all requests from the endpoint's queue
3275 * @hsotg: The device state.
3276 * @ep: The endpoint the requests may be on.
3277 * @result: The result code to use.
3278 *
3279 * Go through the requests on the given endpoint and mark them
3280 * completed with the given result code.
3281 */
3282static void kill_all_requests(struct dwc2_hsotg *hsotg,
3283 struct dwc2_hsotg_ep *ep,
3284 int result)
3285{
3286 unsigned int size;
3287
3288 ep->req = NULL;
3289
3290 while (!list_empty(&ep->queue)) {
3291 struct dwc2_hsotg_req *req = get_ep_head(ep);
3292
3293 dwc2_hsotg_complete_request(hsotg, ep, req, result);
3294 }
3295
3296 if (!hsotg->dedicated_fifos)
3297 return;
3298 size = (dwc2_readl(hsotg, DTXFSTS(ep->fifo_index)) & 0xffff) * 4;
3299 if (size < ep->fifo_size)
3300 dwc2_hsotg_txfifo_flush(hsotg, ep->fifo_index);
3301}
3302
3303/**
3304 * dwc2_hsotg_disconnect - disconnect service
3305 * @hsotg: The device state.
3306 *
3307 * The device has been disconnected. Remove all current
3308 * transactions and signal the gadget driver that this
3309 * has happened.
3310 */
3311void dwc2_hsotg_disconnect(struct dwc2_hsotg *hsotg)
3312{
3313 unsigned int ep;
3314
3315 if (!hsotg->connected)
3316 return;
3317
3318 hsotg->connected = 0;
3319 hsotg->test_mode = 0;
3320
3321 /* all endpoints should be shutdown */
3322 for (ep = 0; ep < hsotg->num_of_eps; ep++) {
3323 if (hsotg->eps_in[ep])
3324 kill_all_requests(hsotg, hsotg->eps_in[ep],
3325 -ESHUTDOWN);
3326 if (hsotg->eps_out[ep])
3327 kill_all_requests(hsotg, hsotg->eps_out[ep],
3328 -ESHUTDOWN);
3329 }
3330
3331 call_gadget(hsotg, disconnect);
3332 hsotg->lx_state = DWC2_L3;
3333
3334 usb_gadget_set_state(&hsotg->gadget, USB_STATE_NOTATTACHED);
3335}
3336
3337/**
3338 * dwc2_hsotg_irq_fifoempty - TX FIFO empty interrupt handler
3339 * @hsotg: The device state:
3340 * @periodic: True if this is a periodic FIFO interrupt
3341 */
3342static void dwc2_hsotg_irq_fifoempty(struct dwc2_hsotg *hsotg, bool periodic)
3343{
3344 struct dwc2_hsotg_ep *ep;
3345 int epno, ret;
3346
3347 /* look through for any more data to transmit */
3348 for (epno = 0; epno < hsotg->num_of_eps; epno++) {
3349 ep = index_to_ep(hsotg, epno, 1);
3350
3351 if (!ep)
3352 continue;
3353
3354 if (!ep->dir_in)
3355 continue;
3356
3357 if ((periodic && !ep->periodic) ||
3358 (!periodic && ep->periodic))
3359 continue;
3360
3361 ret = dwc2_hsotg_trytx(hsotg, ep);
3362 if (ret < 0)
3363 break;
3364 }
3365}
3366
3367/* IRQ flags which will trigger a retry around the IRQ loop */
3368#define IRQ_RETRY_MASK (GINTSTS_NPTXFEMP | \
3369 GINTSTS_PTXFEMP | \
3370 GINTSTS_RXFLVL)
3371
3372static int dwc2_hsotg_ep_disable(struct usb_ep *ep);
3373/**
3374 * dwc2_hsotg_core_init_disconnected - issue softreset to the core
3375 * @hsotg: The device state
3376 * @is_usb_reset: Usb resetting flag
3377 *
3378 * Issue a soft reset to the core, and await the core finishing it.
3379 */
3380void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg,
3381 bool is_usb_reset)
3382{
3383 u32 intmsk;
3384 u32 val;
3385 u32 usbcfg;
3386 u32 dcfg = 0;
3387 int ep;
3388
3389 /* Kill any ep0 requests as controller will be reinitialized */
3390 kill_all_requests(hsotg, hsotg->eps_out[0], -ECONNRESET);
3391
3392 if (!is_usb_reset) {
3393 if (dwc2_core_reset(hsotg, true))
3394 return;
3395 } else {
3396 /* all endpoints should be shutdown */
3397 for (ep = 1; ep < hsotg->num_of_eps; ep++) {
3398 if (hsotg->eps_in[ep])
3399 dwc2_hsotg_ep_disable(&hsotg->eps_in[ep]->ep);
3400 if (hsotg->eps_out[ep])
3401 dwc2_hsotg_ep_disable(&hsotg->eps_out[ep]->ep);
3402 }
3403 }
3404
3405 /*
3406 * we must now enable ep0 ready for host detection and then
3407 * set configuration.
3408 */
3409
3410 /* keep other bits untouched (so e.g. forced modes are not lost) */
3411 usbcfg = dwc2_readl(hsotg, GUSBCFG);
3412 usbcfg &= ~GUSBCFG_TOUTCAL_MASK;
3413 usbcfg |= GUSBCFG_TOUTCAL(7);
3414
3415 /* remove the HNP/SRP and set the PHY */
3416 usbcfg &= ~(GUSBCFG_SRPCAP | GUSBCFG_HNPCAP);
3417 dwc2_writel(hsotg, usbcfg, GUSBCFG);
3418
3419 dwc2_phy_init(hsotg, true);
3420
3421 dwc2_hsotg_init_fifo(hsotg);
3422
3423 if (!is_usb_reset)
3424 dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON);
3425
3426 dcfg |= DCFG_EPMISCNT(1);
3427
3428 switch (hsotg->params.speed) {
3429 case DWC2_SPEED_PARAM_LOW:
3430 dcfg |= DCFG_DEVSPD_LS;
3431 break;
3432 case DWC2_SPEED_PARAM_FULL:
3433 if (hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS)
3434 dcfg |= DCFG_DEVSPD_FS48;
3435 else
3436 dcfg |= DCFG_DEVSPD_FS;
3437 break;
3438 default:
3439 dcfg |= DCFG_DEVSPD_HS;
3440 }
3441
3442 if (hsotg->params.ipg_isoc_en)
3443 dcfg |= DCFG_IPG_ISOC_SUPPORDED;
3444
3445 dwc2_writel(hsotg, dcfg, DCFG);
3446
3447 /* Clear any pending OTG interrupts */
3448 dwc2_writel(hsotg, 0xffffffff, GOTGINT);
3449
3450 /* Clear any pending interrupts */
3451 dwc2_writel(hsotg, 0xffffffff, GINTSTS);
3452 intmsk = GINTSTS_ERLYSUSP | GINTSTS_SESSREQINT |
3453 GINTSTS_GOUTNAKEFF | GINTSTS_GINNAKEFF |
3454 GINTSTS_USBRST | GINTSTS_RESETDET |
3455 GINTSTS_ENUMDONE | GINTSTS_OTGINT |
3456 GINTSTS_USBSUSP | GINTSTS_WKUPINT |
3457 GINTSTS_LPMTRANRCVD;
3458
3459 if (!using_desc_dma(hsotg))
3460 intmsk |= GINTSTS_INCOMPL_SOIN | GINTSTS_INCOMPL_SOOUT;
3461
3462 if (!hsotg->params.external_id_pin_ctl)
3463 intmsk |= GINTSTS_CONIDSTSCHNG;
3464
3465 dwc2_writel(hsotg, intmsk, GINTMSK);
3466
3467 if (using_dma(hsotg)) {
3468 dwc2_writel(hsotg, GAHBCFG_GLBL_INTR_EN | GAHBCFG_DMA_EN |
3469 hsotg->params.ahbcfg,
3470 GAHBCFG);
3471
3472 /* Set DDMA mode support in the core if needed */
3473 if (using_desc_dma(hsotg))
3474 dwc2_set_bit(hsotg, DCFG, DCFG_DESCDMA_EN);
3475
3476 } else {
3477 dwc2_writel(hsotg, ((hsotg->dedicated_fifos) ?
3478 (GAHBCFG_NP_TXF_EMP_LVL |
3479 GAHBCFG_P_TXF_EMP_LVL) : 0) |
3480 GAHBCFG_GLBL_INTR_EN, GAHBCFG);
3481 }
3482
3483 /*
3484 * If INTknTXFEmpMsk is enabled, it's important to disable ep interrupts
3485 * when we have no data to transfer. Otherwise we get being flooded by
3486 * interrupts.
3487 */
3488
3489 dwc2_writel(hsotg, ((hsotg->dedicated_fifos && !using_dma(hsotg)) ?
3490 DIEPMSK_TXFIFOEMPTY | DIEPMSK_INTKNTXFEMPMSK : 0) |
3491 DIEPMSK_EPDISBLDMSK | DIEPMSK_XFERCOMPLMSK |
3492 DIEPMSK_TIMEOUTMSK | DIEPMSK_AHBERRMSK,
3493 DIEPMSK);
3494
3495 /*
3496 * don't need XferCompl, we get that from RXFIFO in slave mode. In
3497 * DMA mode we may need this and StsPhseRcvd.
3498 */
3499 dwc2_writel(hsotg, (using_dma(hsotg) ? (DIEPMSK_XFERCOMPLMSK |
3500 DOEPMSK_STSPHSERCVDMSK) : 0) |
3501 DOEPMSK_EPDISBLDMSK | DOEPMSK_AHBERRMSK |
3502 DOEPMSK_SETUPMSK,
3503 DOEPMSK);
3504
3505 /* Enable BNA interrupt for DDMA */
3506 if (using_desc_dma(hsotg)) {
3507 dwc2_set_bit(hsotg, DOEPMSK, DOEPMSK_BNAMSK);
3508 dwc2_set_bit(hsotg, DIEPMSK, DIEPMSK_BNAININTRMSK);
3509 }
3510
3511 /* Enable Service Interval mode if supported */
3512 if (using_desc_dma(hsotg) && hsotg->params.service_interval)
3513 dwc2_set_bit(hsotg, DCTL, DCTL_SERVICE_INTERVAL_SUPPORTED);
3514
3515 dwc2_writel(hsotg, 0, DAINTMSK);
3516
3517 dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
3518 dwc2_readl(hsotg, DIEPCTL0),
3519 dwc2_readl(hsotg, DOEPCTL0));
3520
3521 /* enable in and out endpoint interrupts */
3522 dwc2_hsotg_en_gsint(hsotg, GINTSTS_OEPINT | GINTSTS_IEPINT);
3523
3524 /*
3525 * Enable the RXFIFO when in slave mode, as this is how we collect
3526 * the data. In DMA mode, we get events from the FIFO but also
3527 * things we cannot process, so do not use it.
3528 */
3529 if (!using_dma(hsotg))
3530 dwc2_hsotg_en_gsint(hsotg, GINTSTS_RXFLVL);
3531
3532 /* Enable interrupts for EP0 in and out */
3533 dwc2_hsotg_ctrl_epint(hsotg, 0, 0, 1);
3534 dwc2_hsotg_ctrl_epint(hsotg, 0, 1, 1);
3535
3536 if (!is_usb_reset) {
3537 dwc2_set_bit(hsotg, DCTL, DCTL_PWRONPRGDONE);
3538 udelay(10); /* see openiboot */
3539 dwc2_clear_bit(hsotg, DCTL, DCTL_PWRONPRGDONE);
3540 }
3541
3542 dev_dbg(hsotg->dev, "DCTL=0x%08x\n", dwc2_readl(hsotg, DCTL));
3543
3544 /*
3545 * DxEPCTL_USBActEp says RO in manual, but seems to be set by
3546 * writing to the EPCTL register..
3547 */
3548
3549 /* set to read 1 8byte packet */
3550 dwc2_writel(hsotg, DXEPTSIZ_MC(1) | DXEPTSIZ_PKTCNT(1) |
3551 DXEPTSIZ_XFERSIZE(8), DOEPTSIZ0);
3552
3553 dwc2_writel(hsotg, dwc2_hsotg_ep0_mps(hsotg->eps_out[0]->ep.maxpacket) |
3554 DXEPCTL_CNAK | DXEPCTL_EPENA |
3555 DXEPCTL_USBACTEP,
3556 DOEPCTL0);
3557
3558 /* enable, but don't activate EP0in */
3559 dwc2_writel(hsotg, dwc2_hsotg_ep0_mps(hsotg->eps_out[0]->ep.maxpacket) |
3560 DXEPCTL_USBACTEP, DIEPCTL0);
3561
3562 /* clear global NAKs */
3563 val = DCTL_CGOUTNAK | DCTL_CGNPINNAK;
3564 if (!is_usb_reset)
3565 val |= DCTL_SFTDISCON;
3566 dwc2_set_bit(hsotg, DCTL, val);
3567
3568 /* configure the core to support LPM */
3569 dwc2_gadget_init_lpm(hsotg);
3570
3571 /* program GREFCLK register if needed */
3572 if (using_desc_dma(hsotg) && hsotg->params.service_interval)
3573 dwc2_gadget_program_ref_clk(hsotg);
3574
3575 /* must be at-least 3ms to allow bus to see disconnect */
3576 mdelay(3);
3577
3578 hsotg->lx_state = DWC2_L0;
3579
3580 dwc2_hsotg_enqueue_setup(hsotg);
3581
3582 dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
3583 dwc2_readl(hsotg, DIEPCTL0),
3584 dwc2_readl(hsotg, DOEPCTL0));
3585}
3586
3587void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg)
3588{
3589 /* set the soft-disconnect bit */
3590 dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON);
3591}
3592
3593void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg)
3594{
3595 /* remove the soft-disconnect and let's go */
3596 if (!hsotg->role_sw || (dwc2_readl(hsotg, GOTGCTL) & GOTGCTL_BSESVLD))
3597 dwc2_clear_bit(hsotg, DCTL, DCTL_SFTDISCON);
3598}
3599
3600/**
3601 * dwc2_gadget_handle_incomplete_isoc_in - handle incomplete ISO IN Interrupt.
3602 * @hsotg: The device state:
3603 *
3604 * This interrupt indicates one of the following conditions occurred while
3605 * transmitting an ISOC transaction.
3606 * - Corrupted IN Token for ISOC EP.
3607 * - Packet not complete in FIFO.
3608 *
3609 * The following actions will be taken:
3610 * - Determine the EP
3611 * - Disable EP; when 'Endpoint Disabled' interrupt is received Flush FIFO
3612 */
3613static void dwc2_gadget_handle_incomplete_isoc_in(struct dwc2_hsotg *hsotg)
3614{
3615 struct dwc2_hsotg_ep *hs_ep;
3616 u32 epctrl;
3617 u32 daintmsk;
3618 u32 idx;
3619
3620 dev_dbg(hsotg->dev, "Incomplete isoc in interrupt received:\n");
3621
3622 daintmsk = dwc2_readl(hsotg, DAINTMSK);
3623
3624 for (idx = 1; idx < hsotg->num_of_eps; idx++) {
3625 hs_ep = hsotg->eps_in[idx];
3626 /* Proceed only unmasked ISOC EPs */
3627 if ((BIT(idx) & ~daintmsk) || !hs_ep->isochronous)
3628 continue;
3629
3630 epctrl = dwc2_readl(hsotg, DIEPCTL(idx));
3631 if ((epctrl & DXEPCTL_EPENA) &&
3632 dwc2_gadget_target_frame_elapsed(hs_ep)) {
3633 epctrl |= DXEPCTL_SNAK;
3634 epctrl |= DXEPCTL_EPDIS;
3635 dwc2_writel(hsotg, epctrl, DIEPCTL(idx));
3636 }
3637 }
3638
3639 /* Clear interrupt */
3640 dwc2_writel(hsotg, GINTSTS_INCOMPL_SOIN, GINTSTS);
3641}
3642
3643/**
3644 * dwc2_gadget_handle_incomplete_isoc_out - handle incomplete ISO OUT Interrupt
3645 * @hsotg: The device state:
3646 *
3647 * This interrupt indicates one of the following conditions occurred while
3648 * transmitting an ISOC transaction.
3649 * - Corrupted OUT Token for ISOC EP.
3650 * - Packet not complete in FIFO.
3651 *
3652 * The following actions will be taken:
3653 * - Determine the EP
3654 * - Set DCTL_SGOUTNAK and unmask GOUTNAKEFF if target frame elapsed.
3655 */
3656static void dwc2_gadget_handle_incomplete_isoc_out(struct dwc2_hsotg *hsotg)
3657{
3658 u32 gintsts;
3659 u32 gintmsk;
3660 u32 daintmsk;
3661 u32 epctrl;
3662 struct dwc2_hsotg_ep *hs_ep;
3663 int idx;
3664
3665 dev_dbg(hsotg->dev, "%s: GINTSTS_INCOMPL_SOOUT\n", __func__);
3666
3667 daintmsk = dwc2_readl(hsotg, DAINTMSK);
3668 daintmsk >>= DAINT_OUTEP_SHIFT;
3669
3670 for (idx = 1; idx < hsotg->num_of_eps; idx++) {
3671 hs_ep = hsotg->eps_out[idx];
3672 /* Proceed only unmasked ISOC EPs */
3673 if ((BIT(idx) & ~daintmsk) || !hs_ep->isochronous)
3674 continue;
3675
3676 epctrl = dwc2_readl(hsotg, DOEPCTL(idx));
3677 if ((epctrl & DXEPCTL_EPENA) &&
3678 dwc2_gadget_target_frame_elapsed(hs_ep)) {
3679 /* Unmask GOUTNAKEFF interrupt */
3680 gintmsk = dwc2_readl(hsotg, GINTMSK);
3681 gintmsk |= GINTSTS_GOUTNAKEFF;
3682 dwc2_writel(hsotg, gintmsk, GINTMSK);
3683
3684 gintsts = dwc2_readl(hsotg, GINTSTS);
3685 if (!(gintsts & GINTSTS_GOUTNAKEFF)) {
3686 dwc2_set_bit(hsotg, DCTL, DCTL_SGOUTNAK);
3687 break;
3688 }
3689 }
3690 }
3691
3692 /* Clear interrupt */
3693 dwc2_writel(hsotg, GINTSTS_INCOMPL_SOOUT, GINTSTS);
3694}
3695
3696/**
3697 * dwc2_hsotg_irq - handle device interrupt
3698 * @irq: The IRQ number triggered
3699 * @pw: The pw value when registered the handler.
3700 */
3701static irqreturn_t dwc2_hsotg_irq(int irq, void *pw)
3702{
3703 struct dwc2_hsotg *hsotg = pw;
3704 int retry_count = 8;
3705 u32 gintsts;
3706 u32 gintmsk;
3707
3708 if (!dwc2_is_device_mode(hsotg))
3709 return IRQ_NONE;
3710
3711 spin_lock(&hsotg->lock);
3712irq_retry:
3713 gintsts = dwc2_readl(hsotg, GINTSTS);
3714 gintmsk = dwc2_readl(hsotg, GINTMSK);
3715
3716 dev_dbg(hsotg->dev, "%s: %08x %08x (%08x) retry %d\n",
3717 __func__, gintsts, gintsts & gintmsk, gintmsk, retry_count);
3718
3719 gintsts &= gintmsk;
3720
3721 if (gintsts & GINTSTS_RESETDET) {
3722 dev_dbg(hsotg->dev, "%s: USBRstDet\n", __func__);
3723
3724 dwc2_writel(hsotg, GINTSTS_RESETDET, GINTSTS);
3725
3726 /* This event must be used only if controller is suspended */
3727 if (hsotg->in_ppd && hsotg->lx_state == DWC2_L2)
3728 dwc2_exit_partial_power_down(hsotg, 0, true);
3729
3730 hsotg->lx_state = DWC2_L0;
3731 }
3732
3733 if (gintsts & (GINTSTS_USBRST | GINTSTS_RESETDET)) {
3734 u32 usb_status = dwc2_readl(hsotg, GOTGCTL);
3735 u32 connected = hsotg->connected;
3736
3737 dev_dbg(hsotg->dev, "%s: USBRst\n", __func__);
3738 dev_dbg(hsotg->dev, "GNPTXSTS=%08x\n",
3739 dwc2_readl(hsotg, GNPTXSTS));
3740
3741 dwc2_writel(hsotg, GINTSTS_USBRST, GINTSTS);
3742
3743 /* Report disconnection if it is not already done. */
3744 dwc2_hsotg_disconnect(hsotg);
3745
3746 /* Reset device address to zero */
3747 dwc2_clear_bit(hsotg, DCFG, DCFG_DEVADDR_MASK);
3748
3749 if (usb_status & GOTGCTL_BSESVLD && connected)
3750 dwc2_hsotg_core_init_disconnected(hsotg, true);
3751 }
3752
3753 if (gintsts & GINTSTS_ENUMDONE) {
3754 dwc2_writel(hsotg, GINTSTS_ENUMDONE, GINTSTS);
3755
3756 dwc2_hsotg_irq_enumdone(hsotg);
3757 }
3758
3759 if (gintsts & (GINTSTS_OEPINT | GINTSTS_IEPINT)) {
3760 u32 daint = dwc2_readl(hsotg, DAINT);
3761 u32 daintmsk = dwc2_readl(hsotg, DAINTMSK);
3762 u32 daint_out, daint_in;
3763 int ep;
3764
3765 daint &= daintmsk;
3766 daint_out = daint >> DAINT_OUTEP_SHIFT;
3767 daint_in = daint & ~(daint_out << DAINT_OUTEP_SHIFT);
3768
3769 dev_dbg(hsotg->dev, "%s: daint=%08x\n", __func__, daint);
3770
3771 for (ep = 0; ep < hsotg->num_of_eps && daint_out;
3772 ep++, daint_out >>= 1) {
3773 if (daint_out & 1)
3774 dwc2_hsotg_epint(hsotg, ep, 0);
3775 }
3776
3777 for (ep = 0; ep < hsotg->num_of_eps && daint_in;
3778 ep++, daint_in >>= 1) {
3779 if (daint_in & 1)
3780 dwc2_hsotg_epint(hsotg, ep, 1);
3781 }
3782 }
3783
3784 /* check both FIFOs */
3785
3786 if (gintsts & GINTSTS_NPTXFEMP) {
3787 dev_dbg(hsotg->dev, "NPTxFEmp\n");
3788
3789 /*
3790 * Disable the interrupt to stop it happening again
3791 * unless one of these endpoint routines decides that
3792 * it needs re-enabling
3793 */
3794
3795 dwc2_hsotg_disable_gsint(hsotg, GINTSTS_NPTXFEMP);
3796 dwc2_hsotg_irq_fifoempty(hsotg, false);
3797 }
3798
3799 if (gintsts & GINTSTS_PTXFEMP) {
3800 dev_dbg(hsotg->dev, "PTxFEmp\n");
3801
3802 /* See note in GINTSTS_NPTxFEmp */
3803
3804 dwc2_hsotg_disable_gsint(hsotg, GINTSTS_PTXFEMP);
3805 dwc2_hsotg_irq_fifoempty(hsotg, true);
3806 }
3807
3808 if (gintsts & GINTSTS_RXFLVL) {
3809 /*
3810 * note, since GINTSTS_RxFLvl doubles as FIFO-not-empty,
3811 * we need to retry dwc2_hsotg_handle_rx if this is still
3812 * set.
3813 */
3814
3815 dwc2_hsotg_handle_rx(hsotg);
3816 }
3817
3818 if (gintsts & GINTSTS_ERLYSUSP) {
3819 dev_dbg(hsotg->dev, "GINTSTS_ErlySusp\n");
3820 dwc2_writel(hsotg, GINTSTS_ERLYSUSP, GINTSTS);
3821 }
3822
3823 /*
3824 * these next two seem to crop-up occasionally causing the core
3825 * to shutdown the USB transfer, so try clearing them and logging
3826 * the occurrence.
3827 */
3828
3829 if (gintsts & GINTSTS_GOUTNAKEFF) {
3830 u8 idx;
3831 u32 epctrl;
3832 u32 gintmsk;
3833 u32 daintmsk;
3834 struct dwc2_hsotg_ep *hs_ep;
3835
3836 daintmsk = dwc2_readl(hsotg, DAINTMSK);
3837 daintmsk >>= DAINT_OUTEP_SHIFT;
3838 /* Mask this interrupt */
3839 gintmsk = dwc2_readl(hsotg, GINTMSK);
3840 gintmsk &= ~GINTSTS_GOUTNAKEFF;
3841 dwc2_writel(hsotg, gintmsk, GINTMSK);
3842
3843 dev_dbg(hsotg->dev, "GOUTNakEff triggered\n");
3844 for (idx = 1; idx < hsotg->num_of_eps; idx++) {
3845 hs_ep = hsotg->eps_out[idx];
3846 /* Proceed only unmasked ISOC EPs */
3847 if (BIT(idx) & ~daintmsk)
3848 continue;
3849
3850 epctrl = dwc2_readl(hsotg, DOEPCTL(idx));
3851
3852 //ISOC Ep's only
3853 if ((epctrl & DXEPCTL_EPENA) && hs_ep->isochronous) {
3854 epctrl |= DXEPCTL_SNAK;
3855 epctrl |= DXEPCTL_EPDIS;
3856 dwc2_writel(hsotg, epctrl, DOEPCTL(idx));
3857 continue;
3858 }
3859
3860 //Non-ISOC EP's
3861 if (hs_ep->halted) {
3862 if (!(epctrl & DXEPCTL_EPENA))
3863 epctrl |= DXEPCTL_EPENA;
3864 epctrl |= DXEPCTL_EPDIS;
3865 epctrl |= DXEPCTL_STALL;
3866 dwc2_writel(hsotg, epctrl, DOEPCTL(idx));
3867 }
3868 }
3869
3870 /* This interrupt bit is cleared in DXEPINT_EPDISBLD handler */
3871 }
3872
3873 if (gintsts & GINTSTS_GINNAKEFF) {
3874 dev_info(hsotg->dev, "GINNakEff triggered\n");
3875
3876 dwc2_set_bit(hsotg, DCTL, DCTL_CGNPINNAK);
3877
3878 dwc2_hsotg_dump(hsotg);
3879 }
3880
3881 if (gintsts & GINTSTS_INCOMPL_SOIN)
3882 dwc2_gadget_handle_incomplete_isoc_in(hsotg);
3883
3884 if (gintsts & GINTSTS_INCOMPL_SOOUT)
3885 dwc2_gadget_handle_incomplete_isoc_out(hsotg);
3886
3887 /*
3888 * if we've had fifo events, we should try and go around the
3889 * loop again to see if there's any point in returning yet.
3890 */
3891
3892 if (gintsts & IRQ_RETRY_MASK && --retry_count > 0)
3893 goto irq_retry;
3894
3895 /* Check WKUP_ALERT interrupt*/
3896 if (hsotg->params.service_interval)
3897 dwc2_gadget_wkup_alert_handler(hsotg);
3898
3899 spin_unlock(&hsotg->lock);
3900
3901 return IRQ_HANDLED;
3902}
3903
3904static void dwc2_hsotg_ep_stop_xfr(struct dwc2_hsotg *hsotg,
3905 struct dwc2_hsotg_ep *hs_ep)
3906{
3907 u32 epctrl_reg;
3908 u32 epint_reg;
3909
3910 epctrl_reg = hs_ep->dir_in ? DIEPCTL(hs_ep->index) :
3911 DOEPCTL(hs_ep->index);
3912 epint_reg = hs_ep->dir_in ? DIEPINT(hs_ep->index) :
3913 DOEPINT(hs_ep->index);
3914
3915 dev_dbg(hsotg->dev, "%s: stopping transfer on %s\n", __func__,
3916 hs_ep->name);
3917
3918 if (hs_ep->dir_in) {
3919 if (hsotg->dedicated_fifos || hs_ep->periodic) {
3920 dwc2_set_bit(hsotg, epctrl_reg, DXEPCTL_SNAK);
3921 /* Wait for Nak effect */
3922 if (dwc2_hsotg_wait_bit_set(hsotg, epint_reg,
3923 DXEPINT_INEPNAKEFF, 100))
3924 dev_warn(hsotg->dev,
3925 "%s: timeout DIEPINT.NAKEFF\n",
3926 __func__);
3927 } else {
3928 dwc2_set_bit(hsotg, DCTL, DCTL_SGNPINNAK);
3929 /* Wait for Nak effect */
3930 if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS,
3931 GINTSTS_GINNAKEFF, 100))
3932 dev_warn(hsotg->dev,
3933 "%s: timeout GINTSTS.GINNAKEFF\n",
3934 __func__);
3935 }
3936 } else {
3937 /* Mask GINTSTS_GOUTNAKEFF interrupt */
3938 dwc2_hsotg_disable_gsint(hsotg, GINTSTS_GOUTNAKEFF);
3939
3940 if (!(dwc2_readl(hsotg, GINTSTS) & GINTSTS_GOUTNAKEFF))
3941 dwc2_set_bit(hsotg, DCTL, DCTL_SGOUTNAK);
3942
3943 if (!using_dma(hsotg)) {
3944 /* Wait for GINTSTS_RXFLVL interrupt */
3945 if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS,
3946 GINTSTS_RXFLVL, 100)) {
3947 dev_warn(hsotg->dev, "%s: timeout GINTSTS.RXFLVL\n",
3948 __func__);
3949 } else {
3950 /*
3951 * Pop GLOBAL OUT NAK status packet from RxFIFO
3952 * to assert GOUTNAKEFF interrupt
3953 */
3954 dwc2_readl(hsotg, GRXSTSP);
3955 }
3956 }
3957
3958 /* Wait for global nak to take effect */
3959 if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS,
3960 GINTSTS_GOUTNAKEFF, 100))
3961 dev_warn(hsotg->dev, "%s: timeout GINTSTS.GOUTNAKEFF\n",
3962 __func__);
3963 }
3964
3965 /* Disable ep */
3966 dwc2_set_bit(hsotg, epctrl_reg, DXEPCTL_EPDIS | DXEPCTL_SNAK);
3967
3968 /* Wait for ep to be disabled */
3969 if (dwc2_hsotg_wait_bit_set(hsotg, epint_reg, DXEPINT_EPDISBLD, 100))
3970 dev_warn(hsotg->dev,
3971 "%s: timeout DOEPCTL.EPDisable\n", __func__);
3972
3973 /* Clear EPDISBLD interrupt */
3974 dwc2_set_bit(hsotg, epint_reg, DXEPINT_EPDISBLD);
3975
3976 if (hs_ep->dir_in) {
3977 unsigned short fifo_index;
3978
3979 if (hsotg->dedicated_fifos || hs_ep->periodic)
3980 fifo_index = hs_ep->fifo_index;
3981 else
3982 fifo_index = 0;
3983
3984 /* Flush TX FIFO */
3985 dwc2_flush_tx_fifo(hsotg, fifo_index);
3986
3987 /* Clear Global In NP NAK in Shared FIFO for non periodic ep */
3988 if (!hsotg->dedicated_fifos && !hs_ep->periodic)
3989 dwc2_set_bit(hsotg, DCTL, DCTL_CGNPINNAK);
3990
3991 } else {
3992 /* Remove global NAKs */
3993 dwc2_set_bit(hsotg, DCTL, DCTL_CGOUTNAK);
3994 }
3995}
3996
3997/**
3998 * dwc2_hsotg_ep_enable - enable the given endpoint
3999 * @ep: The USB endpint to configure
4000 * @desc: The USB endpoint descriptor to configure with.
4001 *
4002 * This is called from the USB gadget code's usb_ep_enable().
4003 */
4004static int dwc2_hsotg_ep_enable(struct usb_ep *ep,
4005 const struct usb_endpoint_descriptor *desc)
4006{
4007 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
4008 struct dwc2_hsotg *hsotg = hs_ep->parent;
4009 unsigned long flags;
4010 unsigned int index = hs_ep->index;
4011 u32 epctrl_reg;
4012 u32 epctrl;
4013 u32 mps;
4014 u32 mc;
4015 u32 mask;
4016 unsigned int dir_in;
4017 unsigned int i, val, size;
4018 int ret = 0;
4019 unsigned char ep_type;
4020 int desc_num;
4021
4022 dev_dbg(hsotg->dev,
4023 "%s: ep %s: a 0x%02x, attr 0x%02x, mps 0x%04x, intr %d\n",
4024 __func__, ep->name, desc->bEndpointAddress, desc->bmAttributes,
4025 desc->wMaxPacketSize, desc->bInterval);
4026
4027 /* not to be called for EP0 */
4028 if (index == 0) {
4029 dev_err(hsotg->dev, "%s: called for EP 0\n", __func__);
4030 return -EINVAL;
4031 }
4032
4033 dir_in = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? 1 : 0;
4034 if (dir_in != hs_ep->dir_in) {
4035 dev_err(hsotg->dev, "%s: direction mismatch!\n", __func__);
4036 return -EINVAL;
4037 }
4038
4039 ep_type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
4040 mps = usb_endpoint_maxp(desc);
4041 mc = usb_endpoint_maxp_mult(desc);
4042
4043 /* ISOC IN in DDMA supported bInterval up to 10 */
4044 if (using_desc_dma(hsotg) && ep_type == USB_ENDPOINT_XFER_ISOC &&
4045 dir_in && desc->bInterval > 10) {
4046 dev_err(hsotg->dev,
4047 "%s: ISOC IN, DDMA: bInterval>10 not supported!\n", __func__);
4048 return -EINVAL;
4049 }
4050
4051 /* High bandwidth ISOC OUT in DDMA not supported */
4052 if (using_desc_dma(hsotg) && ep_type == USB_ENDPOINT_XFER_ISOC &&
4053 !dir_in && mc > 1) {
4054 dev_err(hsotg->dev,
4055 "%s: ISOC OUT, DDMA: HB not supported!\n", __func__);
4056 return -EINVAL;
4057 }
4058
4059 /* note, we handle this here instead of dwc2_hsotg_set_ep_maxpacket */
4060
4061 epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);
4062 epctrl = dwc2_readl(hsotg, epctrl_reg);
4063
4064 dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x from 0x%08x\n",
4065 __func__, epctrl, epctrl_reg);
4066
4067 if (using_desc_dma(hsotg) && ep_type == USB_ENDPOINT_XFER_ISOC)
4068 desc_num = MAX_DMA_DESC_NUM_HS_ISOC;
4069 else
4070 desc_num = MAX_DMA_DESC_NUM_GENERIC;
4071
4072 /* Allocate DMA descriptor chain for non-ctrl endpoints */
4073 if (using_desc_dma(hsotg) && !hs_ep->desc_list) {
4074 hs_ep->desc_list = dmam_alloc_coherent(hsotg->dev,
4075 desc_num * sizeof(struct dwc2_dma_desc),
4076 &hs_ep->desc_list_dma, GFP_ATOMIC);
4077 if (!hs_ep->desc_list) {
4078 ret = -ENOMEM;
4079 goto error2;
4080 }
4081 }
4082
4083 spin_lock_irqsave(&hsotg->lock, flags);
4084
4085 epctrl &= ~(DXEPCTL_EPTYPE_MASK | DXEPCTL_MPS_MASK);
4086 epctrl |= DXEPCTL_MPS(mps);
4087
4088 /*
4089 * mark the endpoint as active, otherwise the core may ignore
4090 * transactions entirely for this endpoint
4091 */
4092 epctrl |= DXEPCTL_USBACTEP;
4093
4094 /* update the endpoint state */
4095 dwc2_hsotg_set_ep_maxpacket(hsotg, hs_ep->index, mps, mc, dir_in);
4096
4097 /* default, set to non-periodic */
4098 hs_ep->isochronous = 0;
4099 hs_ep->periodic = 0;
4100 hs_ep->halted = 0;
4101 hs_ep->wedged = 0;
4102 hs_ep->interval = desc->bInterval;
4103
4104 switch (ep_type) {
4105 case USB_ENDPOINT_XFER_ISOC:
4106 epctrl |= DXEPCTL_EPTYPE_ISO;
4107 epctrl |= DXEPCTL_SETEVENFR;
4108 hs_ep->isochronous = 1;
4109 hs_ep->interval = 1 << (desc->bInterval - 1);
4110 hs_ep->target_frame = TARGET_FRAME_INITIAL;
4111 hs_ep->next_desc = 0;
4112 hs_ep->compl_desc = 0;
4113 if (dir_in) {
4114 hs_ep->periodic = 1;
4115 mask = dwc2_readl(hsotg, DIEPMSK);
4116 mask |= DIEPMSK_NAKMSK;
4117 dwc2_writel(hsotg, mask, DIEPMSK);
4118 } else {
4119 epctrl |= DXEPCTL_SNAK;
4120 mask = dwc2_readl(hsotg, DOEPMSK);
4121 mask |= DOEPMSK_OUTTKNEPDISMSK;
4122 dwc2_writel(hsotg, mask, DOEPMSK);
4123 }
4124 break;
4125
4126 case USB_ENDPOINT_XFER_BULK:
4127 epctrl |= DXEPCTL_EPTYPE_BULK;
4128 break;
4129
4130 case USB_ENDPOINT_XFER_INT:
4131 if (dir_in)
4132 hs_ep->periodic = 1;
4133
4134 if (hsotg->gadget.speed == USB_SPEED_HIGH)
4135 hs_ep->interval = 1 << (desc->bInterval - 1);
4136
4137 epctrl |= DXEPCTL_EPTYPE_INTERRUPT;
4138 break;
4139
4140 case USB_ENDPOINT_XFER_CONTROL:
4141 epctrl |= DXEPCTL_EPTYPE_CONTROL;
4142 break;
4143 }
4144
4145 /*
4146 * if the hardware has dedicated fifos, we must give each IN EP
4147 * a unique tx-fifo even if it is non-periodic.
4148 */
4149 if (dir_in && hsotg->dedicated_fifos) {
4150 unsigned fifo_count = dwc2_hsotg_tx_fifo_count(hsotg);
4151 u32 fifo_index = 0;
4152 u32 fifo_size = UINT_MAX;
4153
4154 size = hs_ep->ep.maxpacket * hs_ep->mc;
4155 for (i = 1; i <= fifo_count; ++i) {
4156 if (hsotg->fifo_map & (1 << i))
4157 continue;
4158 val = dwc2_readl(hsotg, DPTXFSIZN(i));
4159 val = (val >> FIFOSIZE_DEPTH_SHIFT) * 4;
4160 if (val < size)
4161 continue;
4162 /* Search for smallest acceptable fifo */
4163 if (val < fifo_size) {
4164 fifo_size = val;
4165 fifo_index = i;
4166 }
4167 }
4168 if (!fifo_index) {
4169 dev_err(hsotg->dev,
4170 "%s: No suitable fifo found\n", __func__);
4171 ret = -ENOMEM;
4172 goto error1;
4173 }
4174 epctrl &= ~(DXEPCTL_TXFNUM_LIMIT << DXEPCTL_TXFNUM_SHIFT);
4175 hsotg->fifo_map |= 1 << fifo_index;
4176 epctrl |= DXEPCTL_TXFNUM(fifo_index);
4177 hs_ep->fifo_index = fifo_index;
4178 hs_ep->fifo_size = fifo_size;
4179 }
4180
4181 /* for non control endpoints, set PID to D0 */
4182 if (index && !hs_ep->isochronous)
4183 epctrl |= DXEPCTL_SETD0PID;
4184
4185 /* WA for Full speed ISOC IN in DDMA mode.
4186 * By Clear NAK status of EP, core will send ZLP
4187 * to IN token and assert NAK interrupt relying
4188 * on TxFIFO status only
4189 */
4190
4191 if (hsotg->gadget.speed == USB_SPEED_FULL &&
4192 hs_ep->isochronous && dir_in) {
4193 /* The WA applies only to core versions from 2.72a
4194 * to 4.00a (including both). Also for FS_IOT_1.00a
4195 * and HS_IOT_1.00a.
4196 */
4197 u32 gsnpsid = dwc2_readl(hsotg, GSNPSID);
4198
4199 if ((gsnpsid >= DWC2_CORE_REV_2_72a &&
4200 gsnpsid <= DWC2_CORE_REV_4_00a) ||
4201 gsnpsid == DWC2_FS_IOT_REV_1_00a ||
4202 gsnpsid == DWC2_HS_IOT_REV_1_00a)
4203 epctrl |= DXEPCTL_CNAK;
4204 }
4205
4206 dev_dbg(hsotg->dev, "%s: write DxEPCTL=0x%08x\n",
4207 __func__, epctrl);
4208
4209 dwc2_writel(hsotg, epctrl, epctrl_reg);
4210 dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x\n",
4211 __func__, dwc2_readl(hsotg, epctrl_reg));
4212
4213 /* enable the endpoint interrupt */
4214 dwc2_hsotg_ctrl_epint(hsotg, index, dir_in, 1);
4215
4216error1:
4217 spin_unlock_irqrestore(&hsotg->lock, flags);
4218
4219error2:
4220 if (ret && using_desc_dma(hsotg) && hs_ep->desc_list) {
4221 dmam_free_coherent(hsotg->dev, desc_num *
4222 sizeof(struct dwc2_dma_desc),
4223 hs_ep->desc_list, hs_ep->desc_list_dma);
4224 hs_ep->desc_list = NULL;
4225 }
4226
4227 return ret;
4228}
4229
4230/**
4231 * dwc2_hsotg_ep_disable - disable given endpoint
4232 * @ep: The endpoint to disable.
4233 */
4234static int dwc2_hsotg_ep_disable(struct usb_ep *ep)
4235{
4236 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
4237 struct dwc2_hsotg *hsotg = hs_ep->parent;
4238 int dir_in = hs_ep->dir_in;
4239 int index = hs_ep->index;
4240 u32 epctrl_reg;
4241 u32 ctrl;
4242
4243 dev_dbg(hsotg->dev, "%s(ep %p)\n", __func__, ep);
4244
4245 if (ep == &hsotg->eps_out[0]->ep) {
4246 dev_err(hsotg->dev, "%s: called for ep0\n", __func__);
4247 return -EINVAL;
4248 }
4249
4250 if (hsotg->op_state != OTG_STATE_B_PERIPHERAL) {
4251 dev_err(hsotg->dev, "%s: called in host mode?\n", __func__);
4252 return -EINVAL;
4253 }
4254
4255 epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);
4256
4257 ctrl = dwc2_readl(hsotg, epctrl_reg);
4258
4259 if (ctrl & DXEPCTL_EPENA)
4260 dwc2_hsotg_ep_stop_xfr(hsotg, hs_ep);
4261
4262 ctrl &= ~DXEPCTL_EPENA;
4263 ctrl &= ~DXEPCTL_USBACTEP;
4264 ctrl |= DXEPCTL_SNAK;
4265
4266 dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl);
4267 dwc2_writel(hsotg, ctrl, epctrl_reg);
4268
4269 /* disable endpoint interrupts */
4270 dwc2_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 0);
4271
4272 /* terminate all requests with shutdown */
4273 kill_all_requests(hsotg, hs_ep, -ESHUTDOWN);
4274
4275 hsotg->fifo_map &= ~(1 << hs_ep->fifo_index);
4276 hs_ep->fifo_index = 0;
4277 hs_ep->fifo_size = 0;
4278
4279 return 0;
4280}
4281
4282static int dwc2_hsotg_ep_disable_lock(struct usb_ep *ep)
4283{
4284 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
4285 struct dwc2_hsotg *hsotg = hs_ep->parent;
4286 unsigned long flags;
4287 int ret;
4288
4289 spin_lock_irqsave(&hsotg->lock, flags);
4290 ret = dwc2_hsotg_ep_disable(ep);
4291 spin_unlock_irqrestore(&hsotg->lock, flags);
4292 return ret;
4293}
4294
4295/**
4296 * on_list - check request is on the given endpoint
4297 * @ep: The endpoint to check.
4298 * @test: The request to test if it is on the endpoint.
4299 */
4300static bool on_list(struct dwc2_hsotg_ep *ep, struct dwc2_hsotg_req *test)
4301{
4302 struct dwc2_hsotg_req *req, *treq;
4303
4304 list_for_each_entry_safe(req, treq, &ep->queue, queue) {
4305 if (req == test)
4306 return true;
4307 }
4308
4309 return false;
4310}
4311
4312/**
4313 * dwc2_hsotg_ep_dequeue - dequeue given endpoint
4314 * @ep: The endpoint to dequeue.
4315 * @req: The request to be removed from a queue.
4316 */
4317static int dwc2_hsotg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
4318{
4319 struct dwc2_hsotg_req *hs_req = our_req(req);
4320 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
4321 struct dwc2_hsotg *hs = hs_ep->parent;
4322 unsigned long flags;
4323
4324 dev_dbg(hs->dev, "ep_dequeue(%p,%p)\n", ep, req);
4325
4326 spin_lock_irqsave(&hs->lock, flags);
4327
4328 if (!on_list(hs_ep, hs_req)) {
4329 spin_unlock_irqrestore(&hs->lock, flags);
4330 return -EINVAL;
4331 }
4332
4333 /* Dequeue already started request */
4334 if (req == &hs_ep->req->req)
4335 dwc2_hsotg_ep_stop_xfr(hs, hs_ep);
4336
4337 dwc2_hsotg_complete_request(hs, hs_ep, hs_req, -ECONNRESET);
4338 spin_unlock_irqrestore(&hs->lock, flags);
4339
4340 return 0;
4341}
4342
4343/**
4344 * dwc2_gadget_ep_set_wedge - set wedge on a given endpoint
4345 * @ep: The endpoint to be wedged.
4346 *
4347 */
4348static int dwc2_gadget_ep_set_wedge(struct usb_ep *ep)
4349{
4350 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
4351 struct dwc2_hsotg *hs = hs_ep->parent;
4352
4353 unsigned long flags;
4354 int ret;
4355
4356 spin_lock_irqsave(&hs->lock, flags);
4357 hs_ep->wedged = 1;
4358 ret = dwc2_hsotg_ep_sethalt(ep, 1, false);
4359 spin_unlock_irqrestore(&hs->lock, flags);
4360
4361 return ret;
4362}
4363
4364/**
4365 * dwc2_hsotg_ep_sethalt - set halt on a given endpoint
4366 * @ep: The endpoint to set halt.
4367 * @value: Set or unset the halt.
4368 * @now: If true, stall the endpoint now. Otherwise return -EAGAIN if
4369 * the endpoint is busy processing requests.
4370 *
4371 * We need to stall the endpoint immediately if request comes from set_feature
4372 * protocol command handler.
4373 */
4374static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value, bool now)
4375{
4376 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
4377 struct dwc2_hsotg *hs = hs_ep->parent;
4378 int index = hs_ep->index;
4379 u32 epreg;
4380 u32 epctl;
4381 u32 xfertype;
4382
4383 dev_info(hs->dev, "%s(ep %p %s, %d)\n", __func__, ep, ep->name, value);
4384
4385 if (index == 0) {
4386 if (value)
4387 dwc2_hsotg_stall_ep0(hs);
4388 else
4389 dev_warn(hs->dev,
4390 "%s: can't clear halt on ep0\n", __func__);
4391 return 0;
4392 }
4393
4394 if (hs_ep->isochronous) {
4395 dev_err(hs->dev, "%s is Isochronous Endpoint\n", ep->name);
4396 return -EINVAL;
4397 }
4398
4399 if (!now && value && !list_empty(&hs_ep->queue)) {
4400 dev_dbg(hs->dev, "%s request is pending, cannot halt\n",
4401 ep->name);
4402 return -EAGAIN;
4403 }
4404
4405 if (hs_ep->dir_in) {
4406 epreg = DIEPCTL(index);
4407 epctl = dwc2_readl(hs, epreg);
4408
4409 if (value) {
4410 epctl |= DXEPCTL_STALL | DXEPCTL_SNAK;
4411 if (epctl & DXEPCTL_EPENA)
4412 epctl |= DXEPCTL_EPDIS;
4413 } else {
4414 epctl &= ~DXEPCTL_STALL;
4415 hs_ep->wedged = 0;
4416 xfertype = epctl & DXEPCTL_EPTYPE_MASK;
4417 if (xfertype == DXEPCTL_EPTYPE_BULK ||
4418 xfertype == DXEPCTL_EPTYPE_INTERRUPT)
4419 epctl |= DXEPCTL_SETD0PID;
4420 }
4421 dwc2_writel(hs, epctl, epreg);
4422 } else {
4423 epreg = DOEPCTL(index);
4424 epctl = dwc2_readl(hs, epreg);
4425
4426 if (value) {
4427 /* Unmask GOUTNAKEFF interrupt */
4428 dwc2_hsotg_en_gsint(hs, GINTSTS_GOUTNAKEFF);
4429
4430 if (!(dwc2_readl(hs, GINTSTS) & GINTSTS_GOUTNAKEFF))
4431 dwc2_set_bit(hs, DCTL, DCTL_SGOUTNAK);
4432 // STALL bit will be set in GOUTNAKEFF interrupt handler
4433 } else {
4434 epctl &= ~DXEPCTL_STALL;
4435 hs_ep->wedged = 0;
4436 xfertype = epctl & DXEPCTL_EPTYPE_MASK;
4437 if (xfertype == DXEPCTL_EPTYPE_BULK ||
4438 xfertype == DXEPCTL_EPTYPE_INTERRUPT)
4439 epctl |= DXEPCTL_SETD0PID;
4440 dwc2_writel(hs, epctl, epreg);
4441 }
4442 }
4443
4444 hs_ep->halted = value;
4445 return 0;
4446}
4447
4448/**
4449 * dwc2_hsotg_ep_sethalt_lock - set halt on a given endpoint with lock held
4450 * @ep: The endpoint to set halt.
4451 * @value: Set or unset the halt.
4452 */
4453static int dwc2_hsotg_ep_sethalt_lock(struct usb_ep *ep, int value)
4454{
4455 struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
4456 struct dwc2_hsotg *hs = hs_ep->parent;
4457 unsigned long flags;
4458 int ret;
4459
4460 spin_lock_irqsave(&hs->lock, flags);
4461 ret = dwc2_hsotg_ep_sethalt(ep, value, false);
4462 spin_unlock_irqrestore(&hs->lock, flags);
4463
4464 return ret;
4465}
4466
4467static const struct usb_ep_ops dwc2_hsotg_ep_ops = {
4468 .enable = dwc2_hsotg_ep_enable,
4469 .disable = dwc2_hsotg_ep_disable_lock,
4470 .alloc_request = dwc2_hsotg_ep_alloc_request,
4471 .free_request = dwc2_hsotg_ep_free_request,
4472 .queue = dwc2_hsotg_ep_queue_lock,
4473 .dequeue = dwc2_hsotg_ep_dequeue,
4474 .set_halt = dwc2_hsotg_ep_sethalt_lock,
4475 .set_wedge = dwc2_gadget_ep_set_wedge,
4476 /* note, don't believe we have any call for the fifo routines */
4477};
4478
4479/**
4480 * dwc2_hsotg_init - initialize the usb core
4481 * @hsotg: The driver state
4482 */
4483static void dwc2_hsotg_init(struct dwc2_hsotg *hsotg)
4484{
4485 /* unmask subset of endpoint interrupts */
4486
4487 dwc2_writel(hsotg, DIEPMSK_TIMEOUTMSK | DIEPMSK_AHBERRMSK |
4488 DIEPMSK_EPDISBLDMSK | DIEPMSK_XFERCOMPLMSK,
4489 DIEPMSK);
4490
4491 dwc2_writel(hsotg, DOEPMSK_SETUPMSK | DOEPMSK_AHBERRMSK |
4492 DOEPMSK_EPDISBLDMSK | DOEPMSK_XFERCOMPLMSK,
4493 DOEPMSK);
4494
4495 dwc2_writel(hsotg, 0, DAINTMSK);
4496
4497 /* Be in disconnected state until gadget is registered */
4498 dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON);
4499
4500 /* setup fifos */
4501
4502 dev_dbg(hsotg->dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n",
4503 dwc2_readl(hsotg, GRXFSIZ),
4504 dwc2_readl(hsotg, GNPTXFSIZ));
4505
4506 dwc2_hsotg_init_fifo(hsotg);
4507
4508 if (using_dma(hsotg))
4509 dwc2_set_bit(hsotg, GAHBCFG, GAHBCFG_DMA_EN);
4510}
4511
4512/**
4513 * dwc2_hsotg_udc_start - prepare the udc for work
4514 * @gadget: The usb gadget state
4515 * @driver: The usb gadget driver
4516 *
4517 * Perform initialization to prepare udc device and driver
4518 * to work.
4519 */
4520static int dwc2_hsotg_udc_start(struct usb_gadget *gadget,
4521 struct usb_gadget_driver *driver)
4522{
4523 struct dwc2_hsotg *hsotg = to_hsotg(gadget);
4524 unsigned long flags;
4525 int ret;
4526
4527 if (!hsotg) {
4528 pr_err("%s: called with no device\n", __func__);
4529 return -ENODEV;
4530 }
4531
4532 if (!driver) {
4533 dev_err(hsotg->dev, "%s: no driver\n", __func__);
4534 return -EINVAL;
4535 }
4536
4537 if (driver->max_speed < USB_SPEED_FULL)
4538 dev_err(hsotg->dev, "%s: bad speed\n", __func__);
4539
4540 if (!driver->setup) {
4541 dev_err(hsotg->dev, "%s: missing entry points\n", __func__);
4542 return -EINVAL;
4543 }
4544
4545 WARN_ON(hsotg->driver);
4546
4547 hsotg->driver = driver;
4548 hsotg->gadget.dev.of_node = hsotg->dev->of_node;
4549 hsotg->gadget.speed = USB_SPEED_UNKNOWN;
4550
4551 if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) {
4552 ret = dwc2_lowlevel_hw_enable(hsotg);
4553 if (ret)
4554 goto err;
4555 }
4556
4557 if (!IS_ERR_OR_NULL(hsotg->uphy))
4558 otg_set_peripheral(hsotg->uphy->otg, &hsotg->gadget);
4559
4560 spin_lock_irqsave(&hsotg->lock, flags);
4561 if (dwc2_hw_is_device(hsotg)) {
4562 dwc2_hsotg_init(hsotg);
4563 dwc2_hsotg_core_init_disconnected(hsotg, false);
4564 }
4565
4566 hsotg->enabled = 0;
4567 spin_unlock_irqrestore(&hsotg->lock, flags);
4568
4569 gadget->sg_supported = using_desc_dma(hsotg);
4570 dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name);
4571
4572 return 0;
4573
4574err:
4575 hsotg->driver = NULL;
4576 return ret;
4577}
4578
4579/**
4580 * dwc2_hsotg_udc_stop - stop the udc
4581 * @gadget: The usb gadget state
4582 *
4583 * Stop udc hw block and stay tunned for future transmissions
4584 */
4585static int dwc2_hsotg_udc_stop(struct usb_gadget *gadget)
4586{
4587 struct dwc2_hsotg *hsotg = to_hsotg(gadget);
4588 unsigned long flags;
4589 int ep;
4590
4591 if (!hsotg)
4592 return -ENODEV;
4593
4594 /* all endpoints should be shutdown */
4595 for (ep = 1; ep < hsotg->num_of_eps; ep++) {
4596 if (hsotg->eps_in[ep])
4597 dwc2_hsotg_ep_disable_lock(&hsotg->eps_in[ep]->ep);
4598 if (hsotg->eps_out[ep])
4599 dwc2_hsotg_ep_disable_lock(&hsotg->eps_out[ep]->ep);
4600 }
4601
4602 spin_lock_irqsave(&hsotg->lock, flags);
4603
4604 hsotg->driver = NULL;
4605 hsotg->gadget.speed = USB_SPEED_UNKNOWN;
4606 hsotg->enabled = 0;
4607
4608 spin_unlock_irqrestore(&hsotg->lock, flags);
4609
4610 if (!IS_ERR_OR_NULL(hsotg->uphy))
4611 otg_set_peripheral(hsotg->uphy->otg, NULL);
4612
4613 if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)
4614 dwc2_lowlevel_hw_disable(hsotg);
4615
4616 return 0;
4617}
4618
4619/**
4620 * dwc2_hsotg_gadget_getframe - read the frame number
4621 * @gadget: The usb gadget state
4622 *
4623 * Read the {micro} frame number
4624 */
4625static int dwc2_hsotg_gadget_getframe(struct usb_gadget *gadget)
4626{
4627 return dwc2_hsotg_read_frameno(to_hsotg(gadget));
4628}
4629
4630/**
4631 * dwc2_hsotg_set_selfpowered - set if device is self/bus powered
4632 * @gadget: The usb gadget state
4633 * @is_selfpowered: Whether the device is self-powered
4634 *
4635 * Set if the device is self or bus powered.
4636 */
4637static int dwc2_hsotg_set_selfpowered(struct usb_gadget *gadget,
4638 int is_selfpowered)
4639{
4640 struct dwc2_hsotg *hsotg = to_hsotg(gadget);
4641 unsigned long flags;
4642
4643 spin_lock_irqsave(&hsotg->lock, flags);
4644 gadget->is_selfpowered = !!is_selfpowered;
4645 spin_unlock_irqrestore(&hsotg->lock, flags);
4646
4647 return 0;
4648}
4649
4650/**
4651 * dwc2_hsotg_pullup - connect/disconnect the USB PHY
4652 * @gadget: The usb gadget state
4653 * @is_on: Current state of the USB PHY
4654 *
4655 * Connect/Disconnect the USB PHY pullup
4656 */
4657static int dwc2_hsotg_pullup(struct usb_gadget *gadget, int is_on)
4658{
4659 struct dwc2_hsotg *hsotg = to_hsotg(gadget);
4660 unsigned long flags;
4661
4662 dev_dbg(hsotg->dev, "%s: is_on: %d op_state: %d\n", __func__, is_on,
4663 hsotg->op_state);
4664
4665 /* Don't modify pullup state while in host mode */
4666 if (hsotg->op_state != OTG_STATE_B_PERIPHERAL) {
4667 hsotg->enabled = is_on;
4668 return 0;
4669 }
4670
4671 spin_lock_irqsave(&hsotg->lock, flags);
4672 if (is_on) {
4673 hsotg->enabled = 1;
4674 dwc2_hsotg_core_init_disconnected(hsotg, false);
4675 /* Enable ACG feature in device mode,if supported */
4676 dwc2_enable_acg(hsotg);
4677 dwc2_hsotg_core_connect(hsotg);
4678 } else {
4679 dwc2_hsotg_core_disconnect(hsotg);
4680 dwc2_hsotg_disconnect(hsotg);
4681 hsotg->enabled = 0;
4682 }
4683
4684 hsotg->gadget.speed = USB_SPEED_UNKNOWN;
4685 spin_unlock_irqrestore(&hsotg->lock, flags);
4686
4687 return 0;
4688}
4689
4690static int dwc2_hsotg_vbus_session(struct usb_gadget *gadget, int is_active)
4691{
4692 struct dwc2_hsotg *hsotg = to_hsotg(gadget);
4693 unsigned long flags;
4694
4695 dev_dbg(hsotg->dev, "%s: is_active: %d\n", __func__, is_active);
4696 spin_lock_irqsave(&hsotg->lock, flags);
4697
4698 /*
4699 * If controller is in partial power down state, it must exit from
4700 * that state before being initialized / de-initialized
4701 */
4702 if (hsotg->lx_state == DWC2_L2 && hsotg->in_ppd)
4703 /*
4704 * No need to check the return value as
4705 * registers are not being restored.
4706 */
4707 dwc2_exit_partial_power_down(hsotg, 0, false);
4708
4709 if (is_active) {
4710 hsotg->op_state = OTG_STATE_B_PERIPHERAL;
4711
4712 dwc2_hsotg_core_init_disconnected(hsotg, false);
4713 if (hsotg->enabled) {
4714 /* Enable ACG feature in device mode,if supported */
4715 dwc2_enable_acg(hsotg);
4716 dwc2_hsotg_core_connect(hsotg);
4717 }
4718 } else {
4719 dwc2_hsotg_core_disconnect(hsotg);
4720 dwc2_hsotg_disconnect(hsotg);
4721 }
4722
4723 spin_unlock_irqrestore(&hsotg->lock, flags);
4724 return 0;
4725}
4726
4727/**
4728 * dwc2_hsotg_vbus_draw - report bMaxPower field
4729 * @gadget: The usb gadget state
4730 * @mA: Amount of current
4731 *
4732 * Report how much power the device may consume to the phy.
4733 */
4734static int dwc2_hsotg_vbus_draw(struct usb_gadget *gadget, unsigned int mA)
4735{
4736 struct dwc2_hsotg *hsotg = to_hsotg(gadget);
4737
4738 if (IS_ERR_OR_NULL(hsotg->uphy))
4739 return -ENOTSUPP;
4740 return usb_phy_set_power(hsotg->uphy, mA);
4741}
4742
4743static void dwc2_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed)
4744{
4745 struct dwc2_hsotg *hsotg = to_hsotg(g);
4746 unsigned long flags;
4747
4748 spin_lock_irqsave(&hsotg->lock, flags);
4749 switch (speed) {
4750 case USB_SPEED_HIGH:
4751 hsotg->params.speed = DWC2_SPEED_PARAM_HIGH;
4752 break;
4753 case USB_SPEED_FULL:
4754 hsotg->params.speed = DWC2_SPEED_PARAM_FULL;
4755 break;
4756 case USB_SPEED_LOW:
4757 hsotg->params.speed = DWC2_SPEED_PARAM_LOW;
4758 break;
4759 default:
4760 dev_err(hsotg->dev, "invalid speed (%d)\n", speed);
4761 }
4762 spin_unlock_irqrestore(&hsotg->lock, flags);
4763}
4764
4765static const struct usb_gadget_ops dwc2_hsotg_gadget_ops = {
4766 .get_frame = dwc2_hsotg_gadget_getframe,
4767 .set_selfpowered = dwc2_hsotg_set_selfpowered,
4768 .udc_start = dwc2_hsotg_udc_start,
4769 .udc_stop = dwc2_hsotg_udc_stop,
4770 .pullup = dwc2_hsotg_pullup,
4771 .udc_set_speed = dwc2_gadget_set_speed,
4772 .vbus_session = dwc2_hsotg_vbus_session,
4773 .vbus_draw = dwc2_hsotg_vbus_draw,
4774};
4775
4776/**
4777 * dwc2_hsotg_initep - initialise a single endpoint
4778 * @hsotg: The device state.
4779 * @hs_ep: The endpoint to be initialised.
4780 * @epnum: The endpoint number
4781 * @dir_in: True if direction is in.
4782 *
4783 * Initialise the given endpoint (as part of the probe and device state
4784 * creation) to give to the gadget driver. Setup the endpoint name, any
4785 * direction information and other state that may be required.
4786 */
4787static void dwc2_hsotg_initep(struct dwc2_hsotg *hsotg,
4788 struct dwc2_hsotg_ep *hs_ep,
4789 int epnum,
4790 bool dir_in)
4791{
4792 char *dir;
4793
4794 if (epnum == 0)
4795 dir = "";
4796 else if (dir_in)
4797 dir = "in";
4798 else
4799 dir = "out";
4800
4801 hs_ep->dir_in = dir_in;
4802 hs_ep->index = epnum;
4803
4804 snprintf(hs_ep->name, sizeof(hs_ep->name), "ep%d%s", epnum, dir);
4805
4806 INIT_LIST_HEAD(&hs_ep->queue);
4807 INIT_LIST_HEAD(&hs_ep->ep.ep_list);
4808
4809 /* add to the list of endpoints known by the gadget driver */
4810 if (epnum)
4811 list_add_tail(&hs_ep->ep.ep_list, &hsotg->gadget.ep_list);
4812
4813 hs_ep->parent = hsotg;
4814 hs_ep->ep.name = hs_ep->name;
4815
4816 if (hsotg->params.speed == DWC2_SPEED_PARAM_LOW)
4817 usb_ep_set_maxpacket_limit(&hs_ep->ep, 8);
4818 else
4819 usb_ep_set_maxpacket_limit(&hs_ep->ep,
4820 epnum ? 1024 : EP0_MPS_LIMIT);
4821 hs_ep->ep.ops = &dwc2_hsotg_ep_ops;
4822
4823 if (epnum == 0) {
4824 hs_ep->ep.caps.type_control = true;
4825 } else {
4826 if (hsotg->params.speed != DWC2_SPEED_PARAM_LOW) {
4827 hs_ep->ep.caps.type_iso = true;
4828 hs_ep->ep.caps.type_bulk = true;
4829 }
4830 hs_ep->ep.caps.type_int = true;
4831 }
4832
4833 if (dir_in)
4834 hs_ep->ep.caps.dir_in = true;
4835 else
4836 hs_ep->ep.caps.dir_out = true;
4837
4838 /*
4839 * if we're using dma, we need to set the next-endpoint pointer
4840 * to be something valid.
4841 */
4842
4843 if (using_dma(hsotg)) {
4844 u32 next = DXEPCTL_NEXTEP((epnum + 1) % 15);
4845
4846 if (dir_in)
4847 dwc2_writel(hsotg, next, DIEPCTL(epnum));
4848 else
4849 dwc2_writel(hsotg, next, DOEPCTL(epnum));
4850 }
4851}
4852
4853/**
4854 * dwc2_hsotg_hw_cfg - read HW configuration registers
4855 * @hsotg: Programming view of the DWC_otg controller
4856 *
4857 * Read the USB core HW configuration registers
4858 */
4859static int dwc2_hsotg_hw_cfg(struct dwc2_hsotg *hsotg)
4860{
4861 u32 cfg;
4862 u32 ep_type;
4863 u32 i;
4864
4865 /* check hardware configuration */
4866
4867 hsotg->num_of_eps = hsotg->hw_params.num_dev_ep;
4868
4869 /* Add ep0 */
4870 hsotg->num_of_eps++;
4871
4872 hsotg->eps_in[0] = devm_kzalloc(hsotg->dev,
4873 sizeof(struct dwc2_hsotg_ep),
4874 GFP_KERNEL);
4875 if (!hsotg->eps_in[0])
4876 return -ENOMEM;
4877 /* Same dwc2_hsotg_ep is used in both directions for ep0 */
4878 hsotg->eps_out[0] = hsotg->eps_in[0];
4879
4880 cfg = hsotg->hw_params.dev_ep_dirs;
4881 for (i = 1, cfg >>= 2; i < hsotg->num_of_eps; i++, cfg >>= 2) {
4882 ep_type = cfg & 3;
4883 /* Direction in or both */
4884 if (!(ep_type & 2)) {
4885 hsotg->eps_in[i] = devm_kzalloc(hsotg->dev,
4886 sizeof(struct dwc2_hsotg_ep), GFP_KERNEL);
4887 if (!hsotg->eps_in[i])
4888 return -ENOMEM;
4889 }
4890 /* Direction out or both */
4891 if (!(ep_type & 1)) {
4892 hsotg->eps_out[i] = devm_kzalloc(hsotg->dev,
4893 sizeof(struct dwc2_hsotg_ep), GFP_KERNEL);
4894 if (!hsotg->eps_out[i])
4895 return -ENOMEM;
4896 }
4897 }
4898
4899 hsotg->fifo_mem = hsotg->hw_params.total_fifo_size;
4900 hsotg->dedicated_fifos = hsotg->hw_params.en_multiple_tx_fifo;
4901
4902 dev_info(hsotg->dev, "EPs: %d, %s fifos, %d entries in SPRAM\n",
4903 hsotg->num_of_eps,
4904 hsotg->dedicated_fifos ? "dedicated" : "shared",
4905 hsotg->fifo_mem);
4906 return 0;
4907}
4908
4909/**
4910 * dwc2_hsotg_dump - dump state of the udc
4911 * @hsotg: Programming view of the DWC_otg controller
4912 *
4913 */
4914static void dwc2_hsotg_dump(struct dwc2_hsotg *hsotg)
4915{
4916#ifdef DEBUG
4917 struct device *dev = hsotg->dev;
4918 u32 val;
4919 int idx;
4920
4921 dev_info(dev, "DCFG=0x%08x, DCTL=0x%08x, DIEPMSK=%08x\n",
4922 dwc2_readl(hsotg, DCFG), dwc2_readl(hsotg, DCTL),
4923 dwc2_readl(hsotg, DIEPMSK));
4924
4925 dev_info(dev, "GAHBCFG=0x%08x, GHWCFG1=0x%08x\n",
4926 dwc2_readl(hsotg, GAHBCFG), dwc2_readl(hsotg, GHWCFG1));
4927
4928 dev_info(dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n",
4929 dwc2_readl(hsotg, GRXFSIZ), dwc2_readl(hsotg, GNPTXFSIZ));
4930
4931 /* show periodic fifo settings */
4932
4933 for (idx = 1; idx < hsotg->num_of_eps; idx++) {
4934 val = dwc2_readl(hsotg, DPTXFSIZN(idx));
4935 dev_info(dev, "DPTx[%d] FSize=%d, StAddr=0x%08x\n", idx,
4936 val >> FIFOSIZE_DEPTH_SHIFT,
4937 val & FIFOSIZE_STARTADDR_MASK);
4938 }
4939
4940 for (idx = 0; idx < hsotg->num_of_eps; idx++) {
4941 dev_info(dev,
4942 "ep%d-in: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", idx,
4943 dwc2_readl(hsotg, DIEPCTL(idx)),
4944 dwc2_readl(hsotg, DIEPTSIZ(idx)),
4945 dwc2_readl(hsotg, DIEPDMA(idx)));
4946
4947 val = dwc2_readl(hsotg, DOEPCTL(idx));
4948 dev_info(dev,
4949 "ep%d-out: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n",
4950 idx, dwc2_readl(hsotg, DOEPCTL(idx)),
4951 dwc2_readl(hsotg, DOEPTSIZ(idx)),
4952 dwc2_readl(hsotg, DOEPDMA(idx)));
4953 }
4954
4955 dev_info(dev, "DVBUSDIS=0x%08x, DVBUSPULSE=%08x\n",
4956 dwc2_readl(hsotg, DVBUSDIS), dwc2_readl(hsotg, DVBUSPULSE));
4957#endif
4958}
4959
4960/**
4961 * dwc2_gadget_init - init function for gadget
4962 * @hsotg: Programming view of the DWC_otg controller
4963 *
4964 */
4965int dwc2_gadget_init(struct dwc2_hsotg *hsotg)
4966{
4967 struct device *dev = hsotg->dev;
4968 int epnum;
4969 int ret;
4970
4971 /* Dump fifo information */
4972 dev_dbg(dev, "NonPeriodic TXFIFO size: %d\n",
4973 hsotg->params.g_np_tx_fifo_size);
4974 dev_dbg(dev, "RXFIFO size: %d\n", hsotg->params.g_rx_fifo_size);
4975
4976 switch (hsotg->params.speed) {
4977 case DWC2_SPEED_PARAM_LOW:
4978 hsotg->gadget.max_speed = USB_SPEED_LOW;
4979 break;
4980 case DWC2_SPEED_PARAM_FULL:
4981 hsotg->gadget.max_speed = USB_SPEED_FULL;
4982 break;
4983 default:
4984 hsotg->gadget.max_speed = USB_SPEED_HIGH;
4985 break;
4986 }
4987
4988 hsotg->gadget.ops = &dwc2_hsotg_gadget_ops;
4989 hsotg->gadget.name = dev_name(dev);
4990 hsotg->gadget.otg_caps = &hsotg->params.otg_caps;
4991 hsotg->remote_wakeup_allowed = 0;
4992
4993 if (hsotg->params.lpm)
4994 hsotg->gadget.lpm_capable = true;
4995
4996 if (hsotg->dr_mode == USB_DR_MODE_OTG)
4997 hsotg->gadget.is_otg = 1;
4998 else if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)
4999 hsotg->op_state = OTG_STATE_B_PERIPHERAL;
5000
5001 ret = dwc2_hsotg_hw_cfg(hsotg);
5002 if (ret) {
5003 dev_err(hsotg->dev, "Hardware configuration failed: %d\n", ret);
5004 return ret;
5005 }
5006
5007 hsotg->ctrl_buff = devm_kzalloc(hsotg->dev,
5008 DWC2_CTRL_BUFF_SIZE, GFP_KERNEL);
5009 if (!hsotg->ctrl_buff)
5010 return -ENOMEM;
5011
5012 hsotg->ep0_buff = devm_kzalloc(hsotg->dev,
5013 DWC2_CTRL_BUFF_SIZE, GFP_KERNEL);
5014 if (!hsotg->ep0_buff)
5015 return -ENOMEM;
5016
5017 if (using_desc_dma(hsotg)) {
5018 ret = dwc2_gadget_alloc_ctrl_desc_chains(hsotg);
5019 if (ret < 0)
5020 return ret;
5021 }
5022
5023 ret = devm_request_irq(hsotg->dev, hsotg->irq, dwc2_hsotg_irq,
5024 IRQF_SHARED, dev_name(hsotg->dev), hsotg);
5025 if (ret < 0) {
5026 dev_err(dev, "cannot claim IRQ for gadget\n");
5027 return ret;
5028 }
5029
5030 /* hsotg->num_of_eps holds number of EPs other than ep0 */
5031
5032 if (hsotg->num_of_eps == 0) {
5033 dev_err(dev, "wrong number of EPs (zero)\n");
5034 return -EINVAL;
5035 }
5036
5037 /* setup endpoint information */
5038
5039 INIT_LIST_HEAD(&hsotg->gadget.ep_list);
5040 hsotg->gadget.ep0 = &hsotg->eps_out[0]->ep;
5041
5042 /* allocate EP0 request */
5043
5044 hsotg->ctrl_req = dwc2_hsotg_ep_alloc_request(&hsotg->eps_out[0]->ep,
5045 GFP_KERNEL);
5046 if (!hsotg->ctrl_req) {
5047 dev_err(dev, "failed to allocate ctrl req\n");
5048 return -ENOMEM;
5049 }
5050
5051 /* initialise the endpoints now the core has been initialised */
5052 for (epnum = 0; epnum < hsotg->num_of_eps; epnum++) {
5053 if (hsotg->eps_in[epnum])
5054 dwc2_hsotg_initep(hsotg, hsotg->eps_in[epnum],
5055 epnum, 1);
5056 if (hsotg->eps_out[epnum])
5057 dwc2_hsotg_initep(hsotg, hsotg->eps_out[epnum],
5058 epnum, 0);
5059 }
5060
5061 dwc2_hsotg_dump(hsotg);
5062
5063 return 0;
5064}
5065
5066/**
5067 * dwc2_hsotg_remove - remove function for hsotg driver
5068 * @hsotg: Programming view of the DWC_otg controller
5069 *
5070 */
5071int dwc2_hsotg_remove(struct dwc2_hsotg *hsotg)
5072{
5073 usb_del_gadget_udc(&hsotg->gadget);
5074 dwc2_hsotg_ep_free_request(&hsotg->eps_out[0]->ep, hsotg->ctrl_req);
5075
5076 return 0;
5077}
5078
5079int dwc2_hsotg_suspend(struct dwc2_hsotg *hsotg)
5080{
5081 unsigned long flags;
5082
5083 if (hsotg->lx_state != DWC2_L0)
5084 return 0;
5085
5086 if (hsotg->driver) {
5087 int ep;
5088
5089 dev_info(hsotg->dev, "suspending usb gadget %s\n",
5090 hsotg->driver->driver.name);
5091
5092 spin_lock_irqsave(&hsotg->lock, flags);
5093 if (hsotg->enabled)
5094 dwc2_hsotg_core_disconnect(hsotg);
5095 dwc2_hsotg_disconnect(hsotg);
5096 hsotg->gadget.speed = USB_SPEED_UNKNOWN;
5097 spin_unlock_irqrestore(&hsotg->lock, flags);
5098
5099 for (ep = 1; ep < hsotg->num_of_eps; ep++) {
5100 if (hsotg->eps_in[ep])
5101 dwc2_hsotg_ep_disable_lock(&hsotg->eps_in[ep]->ep);
5102 if (hsotg->eps_out[ep])
5103 dwc2_hsotg_ep_disable_lock(&hsotg->eps_out[ep]->ep);
5104 }
5105 }
5106
5107 return 0;
5108}
5109
5110int dwc2_hsotg_resume(struct dwc2_hsotg *hsotg)
5111{
5112 unsigned long flags;
5113
5114 if (hsotg->lx_state == DWC2_L2)
5115 return 0;
5116
5117 if (hsotg->driver) {
5118 dev_info(hsotg->dev, "resuming usb gadget %s\n",
5119 hsotg->driver->driver.name);
5120
5121 spin_lock_irqsave(&hsotg->lock, flags);
5122 dwc2_hsotg_core_init_disconnected(hsotg, false);
5123 if (hsotg->enabled) {
5124 /* Enable ACG feature in device mode,if supported */
5125 dwc2_enable_acg(hsotg);
5126 dwc2_hsotg_core_connect(hsotg);
5127 }
5128 spin_unlock_irqrestore(&hsotg->lock, flags);
5129 }
5130
5131 return 0;
5132}
5133
5134/**
5135 * dwc2_backup_device_registers() - Backup controller device registers.
5136 * When suspending usb bus, registers needs to be backuped
5137 * if controller power is disabled once suspended.
5138 *
5139 * @hsotg: Programming view of the DWC_otg controller
5140 */
5141int dwc2_backup_device_registers(struct dwc2_hsotg *hsotg)
5142{
5143 struct dwc2_dregs_backup *dr;
5144 int i;
5145
5146 dev_dbg(hsotg->dev, "%s\n", __func__);
5147
5148 /* Backup dev regs */
5149 dr = &hsotg->dr_backup;
5150
5151 dr->dcfg = dwc2_readl(hsotg, DCFG);
5152 dr->dctl = dwc2_readl(hsotg, DCTL);
5153 dr->daintmsk = dwc2_readl(hsotg, DAINTMSK);
5154 dr->diepmsk = dwc2_readl(hsotg, DIEPMSK);
5155 dr->doepmsk = dwc2_readl(hsotg, DOEPMSK);
5156
5157 for (i = 0; i < hsotg->num_of_eps; i++) {
5158 /* Backup IN EPs */
5159 dr->diepctl[i] = dwc2_readl(hsotg, DIEPCTL(i));
5160
5161 /* Ensure DATA PID is correctly configured */
5162 if (dr->diepctl[i] & DXEPCTL_DPID)
5163 dr->diepctl[i] |= DXEPCTL_SETD1PID;
5164 else
5165 dr->diepctl[i] |= DXEPCTL_SETD0PID;
5166
5167 dr->dieptsiz[i] = dwc2_readl(hsotg, DIEPTSIZ(i));
5168 dr->diepdma[i] = dwc2_readl(hsotg, DIEPDMA(i));
5169
5170 /* Backup OUT EPs */
5171 dr->doepctl[i] = dwc2_readl(hsotg, DOEPCTL(i));
5172
5173 /* Ensure DATA PID is correctly configured */
5174 if (dr->doepctl[i] & DXEPCTL_DPID)
5175 dr->doepctl[i] |= DXEPCTL_SETD1PID;
5176 else
5177 dr->doepctl[i] |= DXEPCTL_SETD0PID;
5178
5179 dr->doeptsiz[i] = dwc2_readl(hsotg, DOEPTSIZ(i));
5180 dr->doepdma[i] = dwc2_readl(hsotg, DOEPDMA(i));
5181 dr->dtxfsiz[i] = dwc2_readl(hsotg, DPTXFSIZN(i));
5182 }
5183 dr->valid = true;
5184 return 0;
5185}
5186
5187/**
5188 * dwc2_restore_device_registers() - Restore controller device registers.
5189 * When resuming usb bus, device registers needs to be restored
5190 * if controller power were disabled.
5191 *
5192 * @hsotg: Programming view of the DWC_otg controller
5193 * @remote_wakeup: Indicates whether resume is initiated by Device or Host.
5194 *
5195 * Return: 0 if successful, negative error code otherwise
5196 */
5197int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg, int remote_wakeup)
5198{
5199 struct dwc2_dregs_backup *dr;
5200 int i;
5201
5202 dev_dbg(hsotg->dev, "%s\n", __func__);
5203
5204 /* Restore dev regs */
5205 dr = &hsotg->dr_backup;
5206 if (!dr->valid) {
5207 dev_err(hsotg->dev, "%s: no device registers to restore\n",
5208 __func__);
5209 return -EINVAL;
5210 }
5211 dr->valid = false;
5212
5213 if (!remote_wakeup)
5214 dwc2_writel(hsotg, dr->dctl, DCTL);
5215
5216 dwc2_writel(hsotg, dr->daintmsk, DAINTMSK);
5217 dwc2_writel(hsotg, dr->diepmsk, DIEPMSK);
5218 dwc2_writel(hsotg, dr->doepmsk, DOEPMSK);
5219
5220 for (i = 0; i < hsotg->num_of_eps; i++) {
5221 /* Restore IN EPs */
5222 dwc2_writel(hsotg, dr->dieptsiz[i], DIEPTSIZ(i));
5223 dwc2_writel(hsotg, dr->diepdma[i], DIEPDMA(i));
5224 dwc2_writel(hsotg, dr->doeptsiz[i], DOEPTSIZ(i));
5225 /** WA for enabled EPx's IN in DDMA mode. On entering to
5226 * hibernation wrong value read and saved from DIEPDMAx,
5227 * as result BNA interrupt asserted on hibernation exit
5228 * by restoring from saved area.
5229 */
5230 if (using_desc_dma(hsotg) &&
5231 (dr->diepctl[i] & DXEPCTL_EPENA))
5232 dr->diepdma[i] = hsotg->eps_in[i]->desc_list_dma;
5233 dwc2_writel(hsotg, dr->dtxfsiz[i], DPTXFSIZN(i));
5234 dwc2_writel(hsotg, dr->diepctl[i], DIEPCTL(i));
5235 /* Restore OUT EPs */
5236 dwc2_writel(hsotg, dr->doeptsiz[i], DOEPTSIZ(i));
5237 /* WA for enabled EPx's OUT in DDMA mode. On entering to
5238 * hibernation wrong value read and saved from DOEPDMAx,
5239 * as result BNA interrupt asserted on hibernation exit
5240 * by restoring from saved area.
5241 */
5242 if (using_desc_dma(hsotg) &&
5243 (dr->doepctl[i] & DXEPCTL_EPENA))
5244 dr->doepdma[i] = hsotg->eps_out[i]->desc_list_dma;
5245 dwc2_writel(hsotg, dr->doepdma[i], DOEPDMA(i));
5246 dwc2_writel(hsotg, dr->doepctl[i], DOEPCTL(i));
5247 }
5248
5249 return 0;
5250}
5251
5252/**
5253 * dwc2_gadget_init_lpm - Configure the core to support LPM in device mode
5254 *
5255 * @hsotg: Programming view of DWC_otg controller
5256 *
5257 */
5258void dwc2_gadget_init_lpm(struct dwc2_hsotg *hsotg)
5259{
5260 u32 val;
5261
5262 if (!hsotg->params.lpm)
5263 return;
5264
5265 val = GLPMCFG_LPMCAP | GLPMCFG_APPL1RES;
5266 val |= hsotg->params.hird_threshold_en ? GLPMCFG_HIRD_THRES_EN : 0;
5267 val |= hsotg->params.lpm_clock_gating ? GLPMCFG_ENBLSLPM : 0;
5268 val |= hsotg->params.hird_threshold << GLPMCFG_HIRD_THRES_SHIFT;
5269 val |= hsotg->params.besl ? GLPMCFG_ENBESL : 0;
5270 val |= GLPMCFG_LPM_REJECT_CTRL_CONTROL;
5271 val |= GLPMCFG_LPM_ACCEPT_CTRL_ISOC;
5272 dwc2_writel(hsotg, val, GLPMCFG);
5273 dev_dbg(hsotg->dev, "GLPMCFG=0x%08x\n", dwc2_readl(hsotg, GLPMCFG));
5274
5275 /* Unmask WKUP_ALERT Interrupt */
5276 if (hsotg->params.service_interval)
5277 dwc2_set_bit(hsotg, GINTMSK2, GINTMSK2_WKUP_ALERT_INT_MSK);
5278}
5279
5280/**
5281 * dwc2_gadget_program_ref_clk - Program GREFCLK register in device mode
5282 *
5283 * @hsotg: Programming view of DWC_otg controller
5284 *
5285 */
5286void dwc2_gadget_program_ref_clk(struct dwc2_hsotg *hsotg)
5287{
5288 u32 val = 0;
5289
5290 val |= GREFCLK_REF_CLK_MODE;
5291 val |= hsotg->params.ref_clk_per << GREFCLK_REFCLKPER_SHIFT;
5292 val |= hsotg->params.sof_cnt_wkup_alert <<
5293 GREFCLK_SOF_CNT_WKUP_ALERT_SHIFT;
5294
5295 dwc2_writel(hsotg, val, GREFCLK);
5296 dev_dbg(hsotg->dev, "GREFCLK=0x%08x\n", dwc2_readl(hsotg, GREFCLK));
5297}
5298
5299/**
5300 * dwc2_gadget_enter_hibernation() - Put controller in Hibernation.
5301 *
5302 * @hsotg: Programming view of the DWC_otg controller
5303 *
5304 * Return non-zero if failed to enter to hibernation.
5305 */
5306int dwc2_gadget_enter_hibernation(struct dwc2_hsotg *hsotg)
5307{
5308 u32 gpwrdn;
5309 int ret = 0;
5310
5311 /* Change to L2(suspend) state */
5312 hsotg->lx_state = DWC2_L2;
5313 dev_dbg(hsotg->dev, "Start of hibernation completed\n");
5314 ret = dwc2_backup_global_registers(hsotg);
5315 if (ret) {
5316 dev_err(hsotg->dev, "%s: failed to backup global registers\n",
5317 __func__);
5318 return ret;
5319 }
5320 ret = dwc2_backup_device_registers(hsotg);
5321 if (ret) {
5322 dev_err(hsotg->dev, "%s: failed to backup device registers\n",
5323 __func__);
5324 return ret;
5325 }
5326
5327 gpwrdn = GPWRDN_PWRDNRSTN;
5328 gpwrdn |= GPWRDN_PMUACTV;
5329 dwc2_writel(hsotg, gpwrdn, GPWRDN);
5330 udelay(10);
5331
5332 /* Set flag to indicate that we are in hibernation */
5333 hsotg->hibernated = 1;
5334
5335 /* Enable interrupts from wake up logic */
5336 gpwrdn = dwc2_readl(hsotg, GPWRDN);
5337 gpwrdn |= GPWRDN_PMUINTSEL;
5338 dwc2_writel(hsotg, gpwrdn, GPWRDN);
5339 udelay(10);
5340
5341 /* Unmask device mode interrupts in GPWRDN */
5342 gpwrdn = dwc2_readl(hsotg, GPWRDN);
5343 gpwrdn |= GPWRDN_RST_DET_MSK;
5344 gpwrdn |= GPWRDN_LNSTSCHG_MSK;
5345 gpwrdn |= GPWRDN_STS_CHGINT_MSK;
5346 dwc2_writel(hsotg, gpwrdn, GPWRDN);
5347 udelay(10);
5348
5349 /* Enable Power Down Clamp */
5350 gpwrdn = dwc2_readl(hsotg, GPWRDN);
5351 gpwrdn |= GPWRDN_PWRDNCLMP;
5352 dwc2_writel(hsotg, gpwrdn, GPWRDN);
5353 udelay(10);
5354
5355 /* Switch off VDD */
5356 gpwrdn = dwc2_readl(hsotg, GPWRDN);
5357 gpwrdn |= GPWRDN_PWRDNSWTCH;
5358 dwc2_writel(hsotg, gpwrdn, GPWRDN);
5359 udelay(10);
5360
5361 /* Save gpwrdn register for further usage if stschng interrupt */
5362 hsotg->gr_backup.gpwrdn = dwc2_readl(hsotg, GPWRDN);
5363 dev_dbg(hsotg->dev, "Hibernation completed\n");
5364
5365 return ret;
5366}
5367
5368/**
5369 * dwc2_gadget_exit_hibernation()
5370 * This function is for exiting from Device mode hibernation by host initiated
5371 * resume/reset and device initiated remote-wakeup.
5372 *
5373 * @hsotg: Programming view of the DWC_otg controller
5374 * @rem_wakeup: indicates whether resume is initiated by Device or Host.
5375 * @reset: indicates whether resume is initiated by Reset.
5376 *
5377 * Return non-zero if failed to exit from hibernation.
5378 */
5379int dwc2_gadget_exit_hibernation(struct dwc2_hsotg *hsotg,
5380 int rem_wakeup, int reset)
5381{
5382 u32 pcgcctl;
5383 u32 gpwrdn;
5384 u32 dctl;
5385 int ret = 0;
5386 struct dwc2_gregs_backup *gr;
5387 struct dwc2_dregs_backup *dr;
5388
5389 gr = &hsotg->gr_backup;
5390 dr = &hsotg->dr_backup;
5391
5392 if (!hsotg->hibernated) {
5393 dev_dbg(hsotg->dev, "Already exited from Hibernation\n");
5394 return 1;
5395 }
5396 dev_dbg(hsotg->dev,
5397 "%s: called with rem_wakeup = %d reset = %d\n",
5398 __func__, rem_wakeup, reset);
5399
5400 dwc2_hib_restore_common(hsotg, rem_wakeup, 0);
5401
5402 if (!reset) {
5403 /* Clear all pending interupts */
5404 dwc2_writel(hsotg, 0xffffffff, GINTSTS);
5405 }
5406
5407 /* De-assert Restore */
5408 gpwrdn = dwc2_readl(hsotg, GPWRDN);
5409 gpwrdn &= ~GPWRDN_RESTORE;
5410 dwc2_writel(hsotg, gpwrdn, GPWRDN);
5411 udelay(10);
5412
5413 if (!rem_wakeup) {
5414 pcgcctl = dwc2_readl(hsotg, PCGCTL);
5415 pcgcctl &= ~PCGCTL_RSTPDWNMODULE;
5416 dwc2_writel(hsotg, pcgcctl, PCGCTL);
5417 }
5418
5419 /* Restore GUSBCFG, DCFG and DCTL */
5420 dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG);
5421 dwc2_writel(hsotg, dr->dcfg, DCFG);
5422 dwc2_writel(hsotg, dr->dctl, DCTL);
5423
5424 /* On USB Reset, reset device address to zero */
5425 if (reset)
5426 dwc2_clear_bit(hsotg, DCFG, DCFG_DEVADDR_MASK);
5427
5428 /* De-assert Wakeup Logic */
5429 gpwrdn = dwc2_readl(hsotg, GPWRDN);
5430 gpwrdn &= ~GPWRDN_PMUACTV;
5431 dwc2_writel(hsotg, gpwrdn, GPWRDN);
5432
5433 if (rem_wakeup) {
5434 udelay(10);
5435 /* Start Remote Wakeup Signaling */
5436 dwc2_writel(hsotg, dr->dctl | DCTL_RMTWKUPSIG, DCTL);
5437 } else {
5438 udelay(50);
5439 /* Set Device programming done bit */
5440 dctl = dwc2_readl(hsotg, DCTL);
5441 dctl |= DCTL_PWRONPRGDONE;
5442 dwc2_writel(hsotg, dctl, DCTL);
5443 }
5444 /* Wait for interrupts which must be cleared */
5445 mdelay(2);
5446 /* Clear all pending interupts */
5447 dwc2_writel(hsotg, 0xffffffff, GINTSTS);
5448
5449 /* Restore global registers */
5450 ret = dwc2_restore_global_registers(hsotg);
5451 if (ret) {
5452 dev_err(hsotg->dev, "%s: failed to restore registers\n",
5453 __func__);
5454 return ret;
5455 }
5456
5457 /* Restore device registers */
5458 ret = dwc2_restore_device_registers(hsotg, rem_wakeup);
5459 if (ret) {
5460 dev_err(hsotg->dev, "%s: failed to restore device registers\n",
5461 __func__);
5462 return ret;
5463 }
5464
5465 if (rem_wakeup) {
5466 mdelay(10);
5467 dctl = dwc2_readl(hsotg, DCTL);
5468 dctl &= ~DCTL_RMTWKUPSIG;
5469 dwc2_writel(hsotg, dctl, DCTL);
5470 }
5471
5472 hsotg->hibernated = 0;
5473 hsotg->lx_state = DWC2_L0;
5474 dev_dbg(hsotg->dev, "Hibernation recovery completes here\n");
5475
5476 return ret;
5477}
5478
5479/**
5480 * dwc2_gadget_enter_partial_power_down() - Put controller in partial
5481 * power down.
5482 *
5483 * @hsotg: Programming view of the DWC_otg controller
5484 *
5485 * Return: non-zero if failed to enter device partial power down.
5486 *
5487 * This function is for entering device mode partial power down.
5488 */
5489int dwc2_gadget_enter_partial_power_down(struct dwc2_hsotg *hsotg)
5490{
5491 u32 pcgcctl;
5492 int ret = 0;
5493
5494 dev_dbg(hsotg->dev, "Entering device partial power down started.\n");
5495
5496 /* Backup all registers */
5497 ret = dwc2_backup_global_registers(hsotg);
5498 if (ret) {
5499 dev_err(hsotg->dev, "%s: failed to backup global registers\n",
5500 __func__);
5501 return ret;
5502 }
5503
5504 ret = dwc2_backup_device_registers(hsotg);
5505 if (ret) {
5506 dev_err(hsotg->dev, "%s: failed to backup device registers\n",
5507 __func__);
5508 return ret;
5509 }
5510
5511 /*
5512 * Clear any pending interrupts since dwc2 will not be able to
5513 * clear them after entering partial_power_down.
5514 */
5515 dwc2_writel(hsotg, 0xffffffff, GINTSTS);
5516
5517 /* Put the controller in low power state */
5518 pcgcctl = dwc2_readl(hsotg, PCGCTL);
5519
5520 pcgcctl |= PCGCTL_PWRCLMP;
5521 dwc2_writel(hsotg, pcgcctl, PCGCTL);
5522 udelay(5);
5523
5524 pcgcctl |= PCGCTL_RSTPDWNMODULE;
5525 dwc2_writel(hsotg, pcgcctl, PCGCTL);
5526 udelay(5);
5527
5528 pcgcctl |= PCGCTL_STOPPCLK;
5529 dwc2_writel(hsotg, pcgcctl, PCGCTL);
5530
5531 /* Set in_ppd flag to 1 as here core enters suspend. */
5532 hsotg->in_ppd = 1;
5533 hsotg->lx_state = DWC2_L2;
5534
5535 dev_dbg(hsotg->dev, "Entering device partial power down completed.\n");
5536
5537 return ret;
5538}
5539
5540/*
5541 * dwc2_gadget_exit_partial_power_down() - Exit controller from device partial
5542 * power down.
5543 *
5544 * @hsotg: Programming view of the DWC_otg controller
5545 * @restore: indicates whether need to restore the registers or not.
5546 *
5547 * Return: non-zero if failed to exit device partial power down.
5548 *
5549 * This function is for exiting from device mode partial power down.
5550 */
5551int dwc2_gadget_exit_partial_power_down(struct dwc2_hsotg *hsotg,
5552 bool restore)
5553{
5554 u32 pcgcctl;
5555 u32 dctl;
5556 struct dwc2_dregs_backup *dr;
5557 int ret = 0;
5558
5559 dr = &hsotg->dr_backup;
5560
5561 dev_dbg(hsotg->dev, "Exiting device partial Power Down started.\n");
5562
5563 pcgcctl = dwc2_readl(hsotg, PCGCTL);
5564 pcgcctl &= ~PCGCTL_STOPPCLK;
5565 dwc2_writel(hsotg, pcgcctl, PCGCTL);
5566
5567 pcgcctl = dwc2_readl(hsotg, PCGCTL);
5568 pcgcctl &= ~PCGCTL_PWRCLMP;
5569 dwc2_writel(hsotg, pcgcctl, PCGCTL);
5570
5571 pcgcctl = dwc2_readl(hsotg, PCGCTL);
5572 pcgcctl &= ~PCGCTL_RSTPDWNMODULE;
5573 dwc2_writel(hsotg, pcgcctl, PCGCTL);
5574
5575 udelay(100);
5576 if (restore) {
5577 ret = dwc2_restore_global_registers(hsotg);
5578 if (ret) {
5579 dev_err(hsotg->dev, "%s: failed to restore registers\n",
5580 __func__);
5581 return ret;
5582 }
5583 /* Restore DCFG */
5584 dwc2_writel(hsotg, dr->dcfg, DCFG);
5585
5586 ret = dwc2_restore_device_registers(hsotg, 0);
5587 if (ret) {
5588 dev_err(hsotg->dev, "%s: failed to restore device registers\n",
5589 __func__);
5590 return ret;
5591 }
5592 }
5593
5594 /* Set the Power-On Programming done bit */
5595 dctl = dwc2_readl(hsotg, DCTL);
5596 dctl |= DCTL_PWRONPRGDONE;
5597 dwc2_writel(hsotg, dctl, DCTL);
5598
5599 /* Set in_ppd flag to 0 as here core exits from suspend. */
5600 hsotg->in_ppd = 0;
5601 hsotg->lx_state = DWC2_L0;
5602
5603 dev_dbg(hsotg->dev, "Exiting device partial Power Down completed.\n");
5604 return ret;
5605}
5606
5607/**
5608 * dwc2_gadget_enter_clock_gating() - Put controller in clock gating.
5609 *
5610 * @hsotg: Programming view of the DWC_otg controller
5611 *
5612 * Return: non-zero if failed to enter device partial power down.
5613 *
5614 * This function is for entering device mode clock gating.
5615 */
5616void dwc2_gadget_enter_clock_gating(struct dwc2_hsotg *hsotg)
5617{
5618 u32 pcgctl;
5619
5620 dev_dbg(hsotg->dev, "Entering device clock gating.\n");
5621
5622 /* Set the Phy Clock bit as suspend is received. */
5623 pcgctl = dwc2_readl(hsotg, PCGCTL);
5624 pcgctl |= PCGCTL_STOPPCLK;
5625 dwc2_writel(hsotg, pcgctl, PCGCTL);
5626 udelay(5);
5627
5628 /* Set the Gate hclk as suspend is received. */
5629 pcgctl = dwc2_readl(hsotg, PCGCTL);
5630 pcgctl |= PCGCTL_GATEHCLK;
5631 dwc2_writel(hsotg, pcgctl, PCGCTL);
5632 udelay(5);
5633
5634 hsotg->lx_state = DWC2_L2;
5635 hsotg->bus_suspended = true;
5636}
5637
5638/*
5639 * dwc2_gadget_exit_clock_gating() - Exit controller from device clock gating.
5640 *
5641 * @hsotg: Programming view of the DWC_otg controller
5642 * @rem_wakeup: indicates whether remote wake up is enabled.
5643 *
5644 * This function is for exiting from device mode clock gating.
5645 */
5646void dwc2_gadget_exit_clock_gating(struct dwc2_hsotg *hsotg, int rem_wakeup)
5647{
5648 u32 pcgctl;
5649 u32 dctl;
5650
5651 dev_dbg(hsotg->dev, "Exiting device clock gating.\n");
5652
5653 /* Clear the Gate hclk. */
5654 pcgctl = dwc2_readl(hsotg, PCGCTL);
5655 pcgctl &= ~PCGCTL_GATEHCLK;
5656 dwc2_writel(hsotg, pcgctl, PCGCTL);
5657 udelay(5);
5658
5659 /* Phy Clock bit. */
5660 pcgctl = dwc2_readl(hsotg, PCGCTL);
5661 pcgctl &= ~PCGCTL_STOPPCLK;
5662 dwc2_writel(hsotg, pcgctl, PCGCTL);
5663 udelay(5);
5664
5665 if (rem_wakeup) {
5666 /* Set Remote Wakeup Signaling */
5667 dctl = dwc2_readl(hsotg, DCTL);
5668 dctl |= DCTL_RMTWKUPSIG;
5669 dwc2_writel(hsotg, dctl, DCTL);
5670 }
5671
5672 /* Change to L0 state */
5673 call_gadget(hsotg, resume);
5674 hsotg->lx_state = DWC2_L0;
5675 hsotg->bus_suspended = false;
5676}