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1// SPDX-License-Identifier: GPL-1.0+
2/*
3 * Renesas USB driver
4 *
5 * Copyright (C) 2011 Renesas Solutions Corp.
6 * Copyright (C) 2019 Renesas Electronics Corporation
7 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
8 */
9#include <linux/delay.h>
10#include <linux/io.h>
11#include <linux/scatterlist.h>
12#include "common.h"
13#include "pipe.h"
14
15#define usbhsf_get_cfifo(p) (&((p)->fifo_info.cfifo))
16
17#define usbhsf_fifo_is_busy(f) ((f)->pipe) /* see usbhs_pipe_select_fifo */
18
19/*
20 * packet initialize
21 */
22void usbhs_pkt_init(struct usbhs_pkt *pkt)
23{
24 INIT_LIST_HEAD(&pkt->node);
25}
26
27/*
28 * packet control function
29 */
30static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
31{
32 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
33 struct device *dev = usbhs_priv_to_dev(priv);
34
35 dev_err(dev, "null handler\n");
36
37 return -EINVAL;
38}
39
40static const struct usbhs_pkt_handle usbhsf_null_handler = {
41 .prepare = usbhsf_null_handle,
42 .try_run = usbhsf_null_handle,
43};
44
45void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
46 void (*done)(struct usbhs_priv *priv,
47 struct usbhs_pkt *pkt),
48 void *buf, int len, int zero, int sequence)
49{
50 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
51 struct device *dev = usbhs_priv_to_dev(priv);
52 unsigned long flags;
53
54 if (!done) {
55 dev_err(dev, "no done function\n");
56 return;
57 }
58
59 /******************** spin lock ********************/
60 usbhs_lock(priv, flags);
61
62 if (!pipe->handler) {
63 dev_err(dev, "no handler function\n");
64 pipe->handler = &usbhsf_null_handler;
65 }
66
67 list_move_tail(&pkt->node, &pipe->list);
68
69 /*
70 * each pkt must hold own handler.
71 * because handler might be changed by its situation.
72 * dma handler -> pio handler.
73 */
74 pkt->pipe = pipe;
75 pkt->buf = buf;
76 pkt->handler = pipe->handler;
77 pkt->length = len;
78 pkt->zero = zero;
79 pkt->actual = 0;
80 pkt->done = done;
81 pkt->sequence = sequence;
82
83 usbhs_unlock(priv, flags);
84 /******************** spin unlock ******************/
85}
86
87static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
88{
89 list_del_init(&pkt->node);
90}
91
92struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
93{
94 return list_first_entry_or_null(&pipe->list, struct usbhs_pkt, node);
95}
96
97static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
98 struct usbhs_fifo *fifo);
99static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
100 struct usbhs_pkt *pkt);
101#define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1)
102#define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
103static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map);
104static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable);
105static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable);
106struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
107{
108 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
109 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
110 unsigned long flags;
111
112 /******************** spin lock ********************/
113 usbhs_lock(priv, flags);
114
115 usbhs_pipe_disable(pipe);
116
117 if (!pkt)
118 pkt = __usbhsf_pkt_get(pipe);
119
120 if (pkt) {
121 struct dma_chan *chan = NULL;
122
123 if (fifo)
124 chan = usbhsf_dma_chan_get(fifo, pkt);
125 if (chan) {
126 dmaengine_terminate_all(chan);
127 usbhsf_dma_unmap(pkt);
128 } else {
129 if (usbhs_pipe_is_dir_in(pipe))
130 usbhsf_rx_irq_ctrl(pipe, 0);
131 else
132 usbhsf_tx_irq_ctrl(pipe, 0);
133 }
134
135 usbhs_pipe_clear_without_sequence(pipe, 0, 0);
136 usbhs_pipe_running(pipe, 0);
137
138 __usbhsf_pkt_del(pkt);
139 }
140
141 if (fifo)
142 usbhsf_fifo_unselect(pipe, fifo);
143
144 usbhs_unlock(priv, flags);
145 /******************** spin unlock ******************/
146
147 return pkt;
148}
149
150enum {
151 USBHSF_PKT_PREPARE,
152 USBHSF_PKT_TRY_RUN,
153 USBHSF_PKT_DMA_DONE,
154};
155
156static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
157{
158 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
159 struct usbhs_pkt *pkt;
160 struct device *dev = usbhs_priv_to_dev(priv);
161 int (*func)(struct usbhs_pkt *pkt, int *is_done);
162 unsigned long flags;
163 int ret = 0;
164 int is_done = 0;
165
166 /******************** spin lock ********************/
167 usbhs_lock(priv, flags);
168
169 pkt = __usbhsf_pkt_get(pipe);
170 if (!pkt) {
171 ret = -EINVAL;
172 goto __usbhs_pkt_handler_end;
173 }
174
175 switch (type) {
176 case USBHSF_PKT_PREPARE:
177 func = pkt->handler->prepare;
178 break;
179 case USBHSF_PKT_TRY_RUN:
180 func = pkt->handler->try_run;
181 break;
182 case USBHSF_PKT_DMA_DONE:
183 func = pkt->handler->dma_done;
184 break;
185 default:
186 dev_err(dev, "unknown pkt handler\n");
187 goto __usbhs_pkt_handler_end;
188 }
189
190 if (likely(func))
191 ret = func(pkt, &is_done);
192
193 if (is_done)
194 __usbhsf_pkt_del(pkt);
195
196__usbhs_pkt_handler_end:
197 usbhs_unlock(priv, flags);
198 /******************** spin unlock ******************/
199
200 if (is_done) {
201 pkt->done(priv, pkt);
202 usbhs_pkt_start(pipe);
203 }
204
205 return ret;
206}
207
208void usbhs_pkt_start(struct usbhs_pipe *pipe)
209{
210 usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
211}
212
213/*
214 * irq enable/disable function
215 */
216#define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
217#define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
218#define usbhsf_irq_callback_ctrl(pipe, status, enable) \
219 ({ \
220 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); \
221 struct usbhs_mod *mod = usbhs_mod_get_current(priv); \
222 u16 status = (1 << usbhs_pipe_number(pipe)); \
223 if (!mod) \
224 return; \
225 if (enable) \
226 mod->status |= status; \
227 else \
228 mod->status &= ~status; \
229 usbhs_irq_callback_update(priv, mod); \
230 })
231
232static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
233{
234 /*
235 * And DCP pipe can NOT use "ready interrupt" for "send"
236 * it should use "empty" interrupt.
237 * see
238 * "Operation" - "Interrupt Function" - "BRDY Interrupt"
239 *
240 * on the other hand, normal pipe can use "ready interrupt" for "send"
241 * even though it is single/double buffer
242 */
243 if (usbhs_pipe_is_dcp(pipe))
244 usbhsf_irq_empty_ctrl(pipe, enable);
245 else
246 usbhsf_irq_ready_ctrl(pipe, enable);
247}
248
249static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
250{
251 usbhsf_irq_ready_ctrl(pipe, enable);
252}
253
254/*
255 * FIFO ctrl
256 */
257static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
258 struct usbhs_fifo *fifo)
259{
260 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
261
262 usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
263}
264
265static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
266 struct usbhs_fifo *fifo)
267{
268 /* The FIFO port is accessible */
269 if (usbhs_read(priv, fifo->ctr) & FRDY)
270 return 0;
271
272 return -EBUSY;
273}
274
275static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
276 struct usbhs_fifo *fifo)
277{
278 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
279 int ret = 0;
280
281 if (!usbhs_pipe_is_dcp(pipe)) {
282 /*
283 * This driver checks the pipe condition first to avoid -EBUSY
284 * from usbhsf_fifo_barrier() if the pipe is RX direction and
285 * empty.
286 */
287 if (usbhs_pipe_is_dir_in(pipe))
288 ret = usbhs_pipe_is_accessible(pipe);
289 if (!ret)
290 ret = usbhsf_fifo_barrier(priv, fifo);
291 }
292
293 /*
294 * if non-DCP pipe, this driver should set BCLR when
295 * usbhsf_fifo_barrier() returns 0.
296 */
297 if (!ret)
298 usbhs_write(priv, fifo->ctr, BCLR);
299}
300
301static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
302 struct usbhs_fifo *fifo)
303{
304 return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
305}
306
307static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
308 struct usbhs_fifo *fifo)
309{
310 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
311
312 usbhs_pipe_select_fifo(pipe, NULL);
313 usbhs_write(priv, fifo->sel, 0);
314}
315
316static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
317 struct usbhs_fifo *fifo,
318 int write)
319{
320 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
321 struct device *dev = usbhs_priv_to_dev(priv);
322 int timeout = 1024;
323 u16 mask = ((1 << 5) | 0xF); /* mask of ISEL | CURPIPE */
324 u16 base = usbhs_pipe_number(pipe); /* CURPIPE */
325
326 if (usbhs_pipe_is_busy(pipe) ||
327 usbhsf_fifo_is_busy(fifo))
328 return -EBUSY;
329
330 if (usbhs_pipe_is_dcp(pipe)) {
331 base |= (1 == write) << 5; /* ISEL */
332
333 if (usbhs_mod_is_host(priv))
334 usbhs_dcp_dir_for_host(pipe, write);
335 }
336
337 /* "base" will be used below */
338 usbhs_write(priv, fifo->sel, base | MBW_32);
339
340 /* check ISEL and CURPIPE value */
341 while (timeout--) {
342 if (base == (mask & usbhs_read(priv, fifo->sel))) {
343 usbhs_pipe_select_fifo(pipe, fifo);
344 return 0;
345 }
346 udelay(10);
347 }
348
349 dev_err(dev, "fifo select error\n");
350
351 return -EIO;
352}
353
354/*
355 * DCP status stage
356 */
357static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
358{
359 struct usbhs_pipe *pipe = pkt->pipe;
360 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
361 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
362 struct device *dev = usbhs_priv_to_dev(priv);
363 int ret;
364
365 usbhs_pipe_disable(pipe);
366
367 ret = usbhsf_fifo_select(pipe, fifo, 1);
368 if (ret < 0) {
369 dev_err(dev, "%s() failed\n", __func__);
370 return ret;
371 }
372
373 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
374
375 usbhsf_fifo_clear(pipe, fifo);
376 usbhsf_send_terminator(pipe, fifo);
377
378 usbhsf_fifo_unselect(pipe, fifo);
379
380 usbhsf_tx_irq_ctrl(pipe, 1);
381 usbhs_pipe_enable(pipe);
382
383 return ret;
384}
385
386static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
387{
388 struct usbhs_pipe *pipe = pkt->pipe;
389 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
390 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
391 struct device *dev = usbhs_priv_to_dev(priv);
392 int ret;
393
394 usbhs_pipe_disable(pipe);
395
396 ret = usbhsf_fifo_select(pipe, fifo, 0);
397 if (ret < 0) {
398 dev_err(dev, "%s() fail\n", __func__);
399 return ret;
400 }
401
402 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
403 usbhsf_fifo_clear(pipe, fifo);
404
405 usbhsf_fifo_unselect(pipe, fifo);
406
407 usbhsf_rx_irq_ctrl(pipe, 1);
408 usbhs_pipe_enable(pipe);
409
410 return ret;
411
412}
413
414static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
415{
416 struct usbhs_pipe *pipe = pkt->pipe;
417
418 if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
419 usbhsf_tx_irq_ctrl(pipe, 0);
420 else
421 usbhsf_rx_irq_ctrl(pipe, 0);
422
423 pkt->actual = pkt->length;
424 *is_done = 1;
425
426 return 0;
427}
428
429const struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
430 .prepare = usbhs_dcp_dir_switch_to_write,
431 .try_run = usbhs_dcp_dir_switch_done,
432};
433
434const struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
435 .prepare = usbhs_dcp_dir_switch_to_read,
436 .try_run = usbhs_dcp_dir_switch_done,
437};
438
439/*
440 * DCP data stage (push)
441 */
442static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
443{
444 struct usbhs_pipe *pipe = pkt->pipe;
445
446 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
447
448 /*
449 * change handler to PIO push
450 */
451 pkt->handler = &usbhs_fifo_pio_push_handler;
452
453 return pkt->handler->prepare(pkt, is_done);
454}
455
456const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
457 .prepare = usbhsf_dcp_data_stage_try_push,
458};
459
460/*
461 * DCP data stage (pop)
462 */
463static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
464 int *is_done)
465{
466 struct usbhs_pipe *pipe = pkt->pipe;
467 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
468 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
469
470 if (usbhs_pipe_is_busy(pipe))
471 return 0;
472
473 /*
474 * prepare pop for DCP should
475 * - change DCP direction,
476 * - clear fifo
477 * - DATA1
478 */
479 usbhs_pipe_disable(pipe);
480
481 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
482
483 usbhsf_fifo_select(pipe, fifo, 0);
484 usbhsf_fifo_clear(pipe, fifo);
485 usbhsf_fifo_unselect(pipe, fifo);
486
487 /*
488 * change handler to PIO pop
489 */
490 pkt->handler = &usbhs_fifo_pio_pop_handler;
491
492 return pkt->handler->prepare(pkt, is_done);
493}
494
495const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
496 .prepare = usbhsf_dcp_data_stage_prepare_pop,
497};
498
499/*
500 * PIO push handler
501 */
502static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
503{
504 struct usbhs_pipe *pipe = pkt->pipe;
505 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
506 struct device *dev = usbhs_priv_to_dev(priv);
507 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
508 void __iomem *addr = priv->base + fifo->port;
509 u8 *buf;
510 int maxp = usbhs_pipe_get_maxpacket(pipe);
511 int total_len;
512 int i, ret, len;
513 int is_short;
514
515 usbhs_pipe_data_sequence(pipe, pkt->sequence);
516 pkt->sequence = -1; /* -1 sequence will be ignored */
517
518 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
519
520 ret = usbhsf_fifo_select(pipe, fifo, 1);
521 if (ret < 0)
522 return 0;
523
524 ret = usbhs_pipe_is_accessible(pipe);
525 if (ret < 0) {
526 /* inaccessible pipe is not an error */
527 ret = 0;
528 goto usbhs_fifo_write_busy;
529 }
530
531 ret = usbhsf_fifo_barrier(priv, fifo);
532 if (ret < 0)
533 goto usbhs_fifo_write_busy;
534
535 buf = pkt->buf + pkt->actual;
536 len = pkt->length - pkt->actual;
537 len = min(len, maxp);
538 total_len = len;
539 is_short = total_len < maxp;
540
541 /*
542 * FIXME
543 *
544 * 32-bit access only
545 */
546 if (len >= 4 && !((unsigned long)buf & 0x03)) {
547 iowrite32_rep(addr, buf, len / 4);
548 len %= 4;
549 buf += total_len - len;
550 }
551
552 /* the rest operation */
553 if (usbhs_get_dparam(priv, cfifo_byte_addr)) {
554 for (i = 0; i < len; i++)
555 iowrite8(buf[i], addr + (i & 0x03));
556 } else {
557 for (i = 0; i < len; i++)
558 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
559 }
560
561 /*
562 * variable update
563 */
564 pkt->actual += total_len;
565
566 if (pkt->actual < pkt->length)
567 *is_done = 0; /* there are remainder data */
568 else if (is_short)
569 *is_done = 1; /* short packet */
570 else
571 *is_done = !pkt->zero; /* send zero packet ? */
572
573 /*
574 * pipe/irq handling
575 */
576 if (is_short)
577 usbhsf_send_terminator(pipe, fifo);
578
579 usbhsf_tx_irq_ctrl(pipe, !*is_done);
580 usbhs_pipe_running(pipe, !*is_done);
581 usbhs_pipe_enable(pipe);
582
583 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
584 usbhs_pipe_number(pipe),
585 pkt->length, pkt->actual, *is_done, pkt->zero);
586
587 usbhsf_fifo_unselect(pipe, fifo);
588
589 return 0;
590
591usbhs_fifo_write_busy:
592 usbhsf_fifo_unselect(pipe, fifo);
593
594 /*
595 * pipe is busy.
596 * retry in interrupt
597 */
598 usbhsf_tx_irq_ctrl(pipe, 1);
599 usbhs_pipe_running(pipe, 1);
600
601 return ret;
602}
603
604static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
605{
606 if (usbhs_pipe_is_running(pkt->pipe))
607 return 0;
608
609 return usbhsf_pio_try_push(pkt, is_done);
610}
611
612const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
613 .prepare = usbhsf_pio_prepare_push,
614 .try_run = usbhsf_pio_try_push,
615};
616
617/*
618 * PIO pop handler
619 */
620static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
621{
622 struct usbhs_pipe *pipe = pkt->pipe;
623 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
624 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
625
626 if (usbhs_pipe_is_busy(pipe))
627 return 0;
628
629 if (usbhs_pipe_is_running(pipe))
630 return 0;
631
632 /*
633 * pipe enable to prepare packet receive
634 */
635 usbhs_pipe_data_sequence(pipe, pkt->sequence);
636 pkt->sequence = -1; /* -1 sequence will be ignored */
637
638 if (usbhs_pipe_is_dcp(pipe))
639 usbhsf_fifo_clear(pipe, fifo);
640
641 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
642 usbhs_pipe_enable(pipe);
643 usbhs_pipe_running(pipe, 1);
644 usbhsf_rx_irq_ctrl(pipe, 1);
645
646 return 0;
647}
648
649static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
650{
651 struct usbhs_pipe *pipe = pkt->pipe;
652 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
653 struct device *dev = usbhs_priv_to_dev(priv);
654 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
655 void __iomem *addr = priv->base + fifo->port;
656 u8 *buf;
657 u32 data = 0;
658 int maxp = usbhs_pipe_get_maxpacket(pipe);
659 int rcv_len, len;
660 int i, ret;
661 int total_len = 0;
662
663 ret = usbhsf_fifo_select(pipe, fifo, 0);
664 if (ret < 0)
665 return 0;
666
667 ret = usbhsf_fifo_barrier(priv, fifo);
668 if (ret < 0)
669 goto usbhs_fifo_read_busy;
670
671 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
672
673 buf = pkt->buf + pkt->actual;
674 len = pkt->length - pkt->actual;
675 len = min(len, rcv_len);
676 total_len = len;
677
678 /*
679 * update actual length first here to decide disable pipe.
680 * if this pipe keeps BUF status and all data were popped,
681 * then, next interrupt/token will be issued again
682 */
683 pkt->actual += total_len;
684
685 if ((pkt->actual == pkt->length) || /* receive all data */
686 (total_len < maxp)) { /* short packet */
687 *is_done = 1;
688 usbhsf_rx_irq_ctrl(pipe, 0);
689 usbhs_pipe_running(pipe, 0);
690 /*
691 * If function mode, since this controller is possible to enter
692 * Control Write status stage at this timing, this driver
693 * should not disable the pipe. If such a case happens, this
694 * controller is not able to complete the status stage.
695 */
696 if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
697 usbhs_pipe_disable(pipe); /* disable pipe first */
698 }
699
700 /*
701 * Buffer clear if Zero-Length packet
702 *
703 * see
704 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
705 */
706 if (0 == rcv_len) {
707 pkt->zero = 1;
708 usbhsf_fifo_clear(pipe, fifo);
709 goto usbhs_fifo_read_end;
710 }
711
712 /*
713 * FIXME
714 *
715 * 32-bit access only
716 */
717 if (len >= 4 && !((unsigned long)buf & 0x03)) {
718 ioread32_rep(addr, buf, len / 4);
719 len %= 4;
720 buf += total_len - len;
721 }
722
723 /* the rest operation */
724 for (i = 0; i < len; i++) {
725 if (!(i & 0x03))
726 data = ioread32(addr);
727
728 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
729 }
730
731usbhs_fifo_read_end:
732 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
733 usbhs_pipe_number(pipe),
734 pkt->length, pkt->actual, *is_done, pkt->zero);
735
736usbhs_fifo_read_busy:
737 usbhsf_fifo_unselect(pipe, fifo);
738
739 return ret;
740}
741
742const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
743 .prepare = usbhsf_prepare_pop,
744 .try_run = usbhsf_pio_try_pop,
745};
746
747/*
748 * DCP ctrol statge handler
749 */
750static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
751{
752 usbhs_dcp_control_transfer_done(pkt->pipe);
753
754 *is_done = 1;
755
756 return 0;
757}
758
759const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
760 .prepare = usbhsf_ctrl_stage_end,
761 .try_run = usbhsf_ctrl_stage_end,
762};
763
764/*
765 * DMA fifo functions
766 */
767static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
768 struct usbhs_pkt *pkt)
769{
770 if (&usbhs_fifo_dma_push_handler == pkt->handler)
771 return fifo->tx_chan;
772
773 if (&usbhs_fifo_dma_pop_handler == pkt->handler)
774 return fifo->rx_chan;
775
776 return NULL;
777}
778
779static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
780 struct usbhs_pkt *pkt)
781{
782 struct usbhs_fifo *fifo;
783 int i;
784
785 usbhs_for_each_dfifo(priv, fifo, i) {
786 if (usbhsf_dma_chan_get(fifo, pkt) &&
787 !usbhsf_fifo_is_busy(fifo))
788 return fifo;
789 }
790
791 return NULL;
792}
793
794#define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE)
795#define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0)
796static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
797 struct usbhs_fifo *fifo,
798 u16 dreqe)
799{
800 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
801
802 usbhs_bset(priv, fifo->sel, DREQE, dreqe);
803}
804
805static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
806{
807 struct usbhs_pipe *pipe = pkt->pipe;
808 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
809 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
810 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
811 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
812
813 return info->dma_map_ctrl(chan->device->dev, pkt, map);
814}
815
816static void usbhsf_dma_complete(void *arg,
817 const struct dmaengine_result *result);
818static void usbhsf_dma_xfer_preparing(struct usbhs_pkt *pkt)
819{
820 struct usbhs_pipe *pipe = pkt->pipe;
821 struct usbhs_fifo *fifo;
822 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
823 struct dma_async_tx_descriptor *desc;
824 struct dma_chan *chan;
825 struct device *dev = usbhs_priv_to_dev(priv);
826 enum dma_transfer_direction dir;
827 dma_cookie_t cookie;
828
829 fifo = usbhs_pipe_to_fifo(pipe);
830 if (!fifo)
831 return;
832
833 chan = usbhsf_dma_chan_get(fifo, pkt);
834 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
835
836 desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
837 pkt->trans, dir,
838 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
839 if (!desc)
840 return;
841
842 desc->callback_result = usbhsf_dma_complete;
843 desc->callback_param = pkt;
844
845 cookie = dmaengine_submit(desc);
846 if (cookie < 0) {
847 dev_err(dev, "Failed to submit dma descriptor\n");
848 return;
849 }
850
851 dev_dbg(dev, " %s %d (%d/ %d)\n",
852 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
853
854 usbhs_pipe_running(pipe, 1);
855 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
856 dma_async_issue_pending(chan);
857 usbhsf_dma_start(pipe, fifo);
858 usbhs_pipe_enable(pipe);
859}
860
861static void xfer_work(struct work_struct *work)
862{
863 struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
864 struct usbhs_pipe *pipe = pkt->pipe;
865 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
866 unsigned long flags;
867
868 usbhs_lock(priv, flags);
869 usbhsf_dma_xfer_preparing(pkt);
870 usbhs_unlock(priv, flags);
871}
872
873/*
874 * DMA push handler
875 */
876static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
877{
878 struct usbhs_pipe *pipe = pkt->pipe;
879 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
880 struct usbhs_fifo *fifo;
881 int len = pkt->length - pkt->actual;
882 int ret;
883 uintptr_t align_mask;
884
885 if (usbhs_pipe_is_busy(pipe))
886 return 0;
887
888 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
889 if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
890 usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
891 goto usbhsf_pio_prepare_push;
892
893 /* check data length if this driver don't use USB-DMAC */
894 if (!usbhs_get_dparam(priv, has_usb_dmac) && len & 0x7)
895 goto usbhsf_pio_prepare_push;
896
897 /* check buffer alignment */
898 align_mask = usbhs_get_dparam(priv, has_usb_dmac) ?
899 USBHS_USB_DMAC_XFER_SIZE - 1 : 0x7;
900 if ((uintptr_t)(pkt->buf + pkt->actual) & align_mask)
901 goto usbhsf_pio_prepare_push;
902
903 /* return at this time if the pipe is running */
904 if (usbhs_pipe_is_running(pipe))
905 return 0;
906
907 /* get enable DMA fifo */
908 fifo = usbhsf_get_dma_fifo(priv, pkt);
909 if (!fifo)
910 goto usbhsf_pio_prepare_push;
911
912 ret = usbhsf_fifo_select(pipe, fifo, 0);
913 if (ret < 0)
914 goto usbhsf_pio_prepare_push;
915
916 if (usbhsf_dma_map(pkt) < 0)
917 goto usbhsf_pio_prepare_push_unselect;
918
919 pkt->trans = len;
920
921 usbhsf_tx_irq_ctrl(pipe, 0);
922 /* FIXME: Workaound for usb dmac that driver can be used in atomic */
923 if (usbhs_get_dparam(priv, has_usb_dmac)) {
924 usbhsf_dma_xfer_preparing(pkt);
925 } else {
926 INIT_WORK(&pkt->work, xfer_work);
927 schedule_work(&pkt->work);
928 }
929
930 return 0;
931
932usbhsf_pio_prepare_push_unselect:
933 usbhsf_fifo_unselect(pipe, fifo);
934usbhsf_pio_prepare_push:
935 /*
936 * change handler to PIO
937 */
938 pkt->handler = &usbhs_fifo_pio_push_handler;
939
940 return pkt->handler->prepare(pkt, is_done);
941}
942
943static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
944{
945 struct usbhs_pipe *pipe = pkt->pipe;
946 int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
947
948 pkt->actual += pkt->trans;
949
950 if (pkt->actual < pkt->length)
951 *is_done = 0; /* there are remainder data */
952 else if (is_short)
953 *is_done = 1; /* short packet */
954 else
955 *is_done = !pkt->zero; /* send zero packet? */
956
957 usbhs_pipe_running(pipe, !*is_done);
958
959 usbhsf_dma_stop(pipe, pipe->fifo);
960 usbhsf_dma_unmap(pkt);
961 usbhsf_fifo_unselect(pipe, pipe->fifo);
962
963 if (!*is_done) {
964 /* change handler to PIO */
965 pkt->handler = &usbhs_fifo_pio_push_handler;
966 return pkt->handler->try_run(pkt, is_done);
967 }
968
969 return 0;
970}
971
972const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
973 .prepare = usbhsf_dma_prepare_push,
974 .dma_done = usbhsf_dma_push_done,
975};
976
977/*
978 * DMA pop handler
979 */
980
981static int usbhsf_dma_prepare_pop_with_rx_irq(struct usbhs_pkt *pkt,
982 int *is_done)
983{
984 return usbhsf_prepare_pop(pkt, is_done);
985}
986
987static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
988 int *is_done)
989{
990 struct usbhs_pipe *pipe = pkt->pipe;
991 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
992 struct usbhs_fifo *fifo;
993 int ret;
994
995 if (usbhs_pipe_is_busy(pipe))
996 return 0;
997
998 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
999 if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
1000 usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
1001 goto usbhsf_pio_prepare_pop;
1002
1003 fifo = usbhsf_get_dma_fifo(priv, pkt);
1004 if (!fifo)
1005 goto usbhsf_pio_prepare_pop;
1006
1007 if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
1008 goto usbhsf_pio_prepare_pop;
1009
1010 /* return at this time if the pipe is running */
1011 if (usbhs_pipe_is_running(pipe))
1012 return 0;
1013
1014 usbhs_pipe_config_change_bfre(pipe, 1);
1015
1016 ret = usbhsf_fifo_select(pipe, fifo, 0);
1017 if (ret < 0)
1018 goto usbhsf_pio_prepare_pop;
1019
1020 if (usbhsf_dma_map(pkt) < 0)
1021 goto usbhsf_pio_prepare_pop_unselect;
1022
1023 /* DMA */
1024
1025 /*
1026 * usbhs_fifo_dma_pop_handler :: prepare
1027 * enabled irq to come here.
1028 * but it is no longer needed for DMA. disable it.
1029 */
1030 usbhsf_rx_irq_ctrl(pipe, 0);
1031
1032 pkt->trans = pkt->length;
1033
1034 usbhsf_dma_xfer_preparing(pkt);
1035
1036 return 0;
1037
1038usbhsf_pio_prepare_pop_unselect:
1039 usbhsf_fifo_unselect(pipe, fifo);
1040usbhsf_pio_prepare_pop:
1041
1042 /*
1043 * change handler to PIO
1044 */
1045 pkt->handler = &usbhs_fifo_pio_pop_handler;
1046 usbhs_pipe_config_change_bfre(pipe, 0);
1047
1048 return pkt->handler->prepare(pkt, is_done);
1049}
1050
1051static int usbhsf_dma_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
1052{
1053 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1054
1055 if (usbhs_get_dparam(priv, has_usb_dmac))
1056 return usbhsf_dma_prepare_pop_with_usb_dmac(pkt, is_done);
1057 else
1058 return usbhsf_dma_prepare_pop_with_rx_irq(pkt, is_done);
1059}
1060
1061static int usbhsf_dma_try_pop_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1062{
1063 struct usbhs_pipe *pipe = pkt->pipe;
1064 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1065 struct usbhs_fifo *fifo;
1066 int len, ret;
1067
1068 if (usbhs_pipe_is_busy(pipe))
1069 return 0;
1070
1071 if (usbhs_pipe_is_dcp(pipe))
1072 goto usbhsf_pio_prepare_pop;
1073
1074 /* get enable DMA fifo */
1075 fifo = usbhsf_get_dma_fifo(priv, pkt);
1076 if (!fifo)
1077 goto usbhsf_pio_prepare_pop;
1078
1079 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
1080 goto usbhsf_pio_prepare_pop;
1081
1082 ret = usbhsf_fifo_select(pipe, fifo, 0);
1083 if (ret < 0)
1084 goto usbhsf_pio_prepare_pop;
1085
1086 /* use PIO if packet is less than pio_dma_border */
1087 len = usbhsf_fifo_rcv_len(priv, fifo);
1088 len = min(pkt->length - pkt->actual, len);
1089 if (len & 0x7) /* 8byte alignment */
1090 goto usbhsf_pio_prepare_pop_unselect;
1091
1092 if (len < usbhs_get_dparam(priv, pio_dma_border))
1093 goto usbhsf_pio_prepare_pop_unselect;
1094
1095 ret = usbhsf_fifo_barrier(priv, fifo);
1096 if (ret < 0)
1097 goto usbhsf_pio_prepare_pop_unselect;
1098
1099 if (usbhsf_dma_map(pkt) < 0)
1100 goto usbhsf_pio_prepare_pop_unselect;
1101
1102 /* DMA */
1103
1104 /*
1105 * usbhs_fifo_dma_pop_handler :: prepare
1106 * enabled irq to come here.
1107 * but it is no longer needed for DMA. disable it.
1108 */
1109 usbhsf_rx_irq_ctrl(pipe, 0);
1110
1111 pkt->trans = len;
1112
1113 INIT_WORK(&pkt->work, xfer_work);
1114 schedule_work(&pkt->work);
1115
1116 return 0;
1117
1118usbhsf_pio_prepare_pop_unselect:
1119 usbhsf_fifo_unselect(pipe, fifo);
1120usbhsf_pio_prepare_pop:
1121
1122 /*
1123 * change handler to PIO
1124 */
1125 pkt->handler = &usbhs_fifo_pio_pop_handler;
1126
1127 return pkt->handler->try_run(pkt, is_done);
1128}
1129
1130static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
1131{
1132 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1133
1134 BUG_ON(usbhs_get_dparam(priv, has_usb_dmac));
1135
1136 return usbhsf_dma_try_pop_with_rx_irq(pkt, is_done);
1137}
1138
1139static int usbhsf_dma_pop_done_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1140{
1141 struct usbhs_pipe *pipe = pkt->pipe;
1142 int maxp = usbhs_pipe_get_maxpacket(pipe);
1143
1144 usbhsf_dma_stop(pipe, pipe->fifo);
1145 usbhsf_dma_unmap(pkt);
1146 usbhsf_fifo_unselect(pipe, pipe->fifo);
1147
1148 pkt->actual += pkt->trans;
1149
1150 if ((pkt->actual == pkt->length) || /* receive all data */
1151 (pkt->trans < maxp)) { /* short packet */
1152 *is_done = 1;
1153 usbhs_pipe_running(pipe, 0);
1154 } else {
1155 /* re-enable */
1156 usbhs_pipe_running(pipe, 0);
1157 usbhsf_prepare_pop(pkt, is_done);
1158 }
1159
1160 return 0;
1161}
1162
1163static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
1164 struct dma_chan *chan, int dtln)
1165{
1166 struct usbhs_pipe *pipe = pkt->pipe;
1167 size_t received_size;
1168 int maxp = usbhs_pipe_get_maxpacket(pipe);
1169
1170 received_size = pkt->length - pkt->dma_result->residue;
1171
1172 if (dtln) {
1173 received_size -= USBHS_USB_DMAC_XFER_SIZE;
1174 received_size &= ~(maxp - 1);
1175 received_size += dtln;
1176 }
1177
1178 return received_size;
1179}
1180
1181static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
1182 int *is_done)
1183{
1184 struct usbhs_pipe *pipe = pkt->pipe;
1185 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1186 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
1187 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
1188 int rcv_len;
1189
1190 /*
1191 * Since the driver disables rx_irq in DMA mode, the interrupt handler
1192 * cannot the BRDYSTS. So, the function clears it here because the
1193 * driver may use PIO mode next time.
1194 */
1195 usbhs_xxxsts_clear(priv, BRDYSTS, usbhs_pipe_number(pipe));
1196
1197 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
1198 usbhsf_fifo_clear(pipe, fifo);
1199 pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
1200
1201 usbhs_pipe_running(pipe, 0);
1202 usbhsf_dma_stop(pipe, fifo);
1203 usbhsf_dma_unmap(pkt);
1204 usbhsf_fifo_unselect(pipe, pipe->fifo);
1205
1206 /* The driver can assume the rx transaction is always "done" */
1207 *is_done = 1;
1208
1209 return 0;
1210}
1211
1212static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
1213{
1214 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1215
1216 if (usbhs_get_dparam(priv, has_usb_dmac))
1217 return usbhsf_dma_pop_done_with_usb_dmac(pkt, is_done);
1218 else
1219 return usbhsf_dma_pop_done_with_rx_irq(pkt, is_done);
1220}
1221
1222const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
1223 .prepare = usbhsf_dma_prepare_pop,
1224 .try_run = usbhsf_dma_try_pop,
1225 .dma_done = usbhsf_dma_pop_done
1226};
1227
1228/*
1229 * DMA setting
1230 */
1231static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
1232{
1233 struct sh_dmae_slave *slave = param;
1234
1235 /*
1236 * FIXME
1237 *
1238 * usbhs doesn't recognize id = 0 as valid DMA
1239 */
1240 if (0 == slave->shdma_slave.slave_id)
1241 return false;
1242
1243 chan->private = slave;
1244
1245 return true;
1246}
1247
1248static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1249{
1250 if (fifo->tx_chan)
1251 dma_release_channel(fifo->tx_chan);
1252 if (fifo->rx_chan)
1253 dma_release_channel(fifo->rx_chan);
1254
1255 fifo->tx_chan = NULL;
1256 fifo->rx_chan = NULL;
1257}
1258
1259static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
1260{
1261 dma_cap_mask_t mask;
1262
1263 dma_cap_zero(mask);
1264 dma_cap_set(DMA_SLAVE, mask);
1265 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1266 &fifo->tx_slave);
1267
1268 dma_cap_zero(mask);
1269 dma_cap_set(DMA_SLAVE, mask);
1270 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1271 &fifo->rx_slave);
1272}
1273
1274static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
1275 int channel)
1276{
1277 char name[16];
1278
1279 /*
1280 * To avoid complex handing for DnFIFOs, the driver uses each
1281 * DnFIFO as TX or RX direction (not bi-direction).
1282 * So, the driver uses odd channels for TX, even channels for RX.
1283 */
1284 snprintf(name, sizeof(name), "ch%d", channel);
1285 if (channel & 1) {
1286 fifo->tx_chan = dma_request_chan(dev, name);
1287 if (IS_ERR(fifo->tx_chan))
1288 fifo->tx_chan = NULL;
1289 } else {
1290 fifo->rx_chan = dma_request_chan(dev, name);
1291 if (IS_ERR(fifo->rx_chan))
1292 fifo->rx_chan = NULL;
1293 }
1294}
1295
1296static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
1297 int channel)
1298{
1299 struct device *dev = usbhs_priv_to_dev(priv);
1300
1301 if (dev_of_node(dev))
1302 usbhsf_dma_init_dt(dev, fifo, channel);
1303 else
1304 usbhsf_dma_init_pdev(fifo);
1305
1306 if (fifo->tx_chan || fifo->rx_chan)
1307 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1308 fifo->name,
1309 fifo->tx_chan ? "[TX]" : " ",
1310 fifo->rx_chan ? "[RX]" : " ");
1311}
1312
1313/*
1314 * irq functions
1315 */
1316static int usbhsf_irq_empty(struct usbhs_priv *priv,
1317 struct usbhs_irq_state *irq_state)
1318{
1319 struct usbhs_pipe *pipe;
1320 struct device *dev = usbhs_priv_to_dev(priv);
1321 int i, ret;
1322
1323 if (!irq_state->bempsts) {
1324 dev_err(dev, "debug %s !!\n", __func__);
1325 return -EIO;
1326 }
1327
1328 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1329
1330 /*
1331 * search interrupted "pipe"
1332 * not "uep".
1333 */
1334 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1335 if (!(irq_state->bempsts & (1 << i)))
1336 continue;
1337
1338 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1339 if (ret < 0)
1340 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1341 }
1342
1343 return 0;
1344}
1345
1346static int usbhsf_irq_ready(struct usbhs_priv *priv,
1347 struct usbhs_irq_state *irq_state)
1348{
1349 struct usbhs_pipe *pipe;
1350 struct device *dev = usbhs_priv_to_dev(priv);
1351 int i, ret;
1352
1353 if (!irq_state->brdysts) {
1354 dev_err(dev, "debug %s !!\n", __func__);
1355 return -EIO;
1356 }
1357
1358 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1359
1360 /*
1361 * search interrupted "pipe"
1362 * not "uep".
1363 */
1364 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1365 if (!(irq_state->brdysts & (1 << i)))
1366 continue;
1367
1368 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1369 if (ret < 0)
1370 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1371 }
1372
1373 return 0;
1374}
1375
1376static void usbhsf_dma_complete(void *arg,
1377 const struct dmaengine_result *result)
1378{
1379 struct usbhs_pkt *pkt = arg;
1380 struct usbhs_pipe *pipe = pkt->pipe;
1381 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1382 struct device *dev = usbhs_priv_to_dev(priv);
1383 int ret;
1384
1385 pkt->dma_result = result;
1386 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1387 if (ret < 0)
1388 dev_err(dev, "dma_complete run_error %d : %d\n",
1389 usbhs_pipe_number(pipe), ret);
1390}
1391
1392void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe)
1393{
1394 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1395 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
1396
1397 /* clear DCP FIFO of transmission */
1398 if (usbhsf_fifo_select(pipe, fifo, 1) < 0)
1399 return;
1400 usbhsf_fifo_clear(pipe, fifo);
1401 usbhsf_fifo_unselect(pipe, fifo);
1402
1403 /* clear DCP FIFO of reception */
1404 if (usbhsf_fifo_select(pipe, fifo, 0) < 0)
1405 return;
1406 usbhsf_fifo_clear(pipe, fifo);
1407 usbhsf_fifo_unselect(pipe, fifo);
1408}
1409
1410/*
1411 * fifo init
1412 */
1413void usbhs_fifo_init(struct usbhs_priv *priv)
1414{
1415 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1416 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1417 struct usbhs_fifo *dfifo;
1418 int i;
1419
1420 mod->irq_empty = usbhsf_irq_empty;
1421 mod->irq_ready = usbhsf_irq_ready;
1422 mod->irq_bempsts = 0;
1423 mod->irq_brdysts = 0;
1424
1425 cfifo->pipe = NULL;
1426 usbhs_for_each_dfifo(priv, dfifo, i)
1427 dfifo->pipe = NULL;
1428}
1429
1430void usbhs_fifo_quit(struct usbhs_priv *priv)
1431{
1432 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1433
1434 mod->irq_empty = NULL;
1435 mod->irq_ready = NULL;
1436 mod->irq_bempsts = 0;
1437 mod->irq_brdysts = 0;
1438}
1439
1440#define __USBHS_DFIFO_INIT(priv, fifo, channel, fifo_port) \
1441do { \
1442 fifo = usbhsf_get_dnfifo(priv, channel); \
1443 fifo->name = "D"#channel"FIFO"; \
1444 fifo->port = fifo_port; \
1445 fifo->sel = D##channel##FIFOSEL; \
1446 fifo->ctr = D##channel##FIFOCTR; \
1447 fifo->tx_slave.shdma_slave.slave_id = \
1448 usbhs_get_dparam(priv, d##channel##_tx_id); \
1449 fifo->rx_slave.shdma_slave.slave_id = \
1450 usbhs_get_dparam(priv, d##channel##_rx_id); \
1451 usbhsf_dma_init(priv, fifo, channel); \
1452} while (0)
1453
1454#define USBHS_DFIFO_INIT(priv, fifo, channel) \
1455 __USBHS_DFIFO_INIT(priv, fifo, channel, D##channel##FIFO)
1456#define USBHS_DFIFO_INIT_NO_PORT(priv, fifo, channel) \
1457 __USBHS_DFIFO_INIT(priv, fifo, channel, 0)
1458
1459int usbhs_fifo_probe(struct usbhs_priv *priv)
1460{
1461 struct usbhs_fifo *fifo;
1462
1463 /* CFIFO */
1464 fifo = usbhsf_get_cfifo(priv);
1465 fifo->name = "CFIFO";
1466 fifo->port = CFIFO;
1467 fifo->sel = CFIFOSEL;
1468 fifo->ctr = CFIFOCTR;
1469
1470 /* DFIFO */
1471 USBHS_DFIFO_INIT(priv, fifo, 0);
1472 USBHS_DFIFO_INIT(priv, fifo, 1);
1473 USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 2);
1474 USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 3);
1475
1476 return 0;
1477}
1478
1479void usbhs_fifo_remove(struct usbhs_priv *priv)
1480{
1481 struct usbhs_fifo *fifo;
1482 int i;
1483
1484 usbhs_for_each_dfifo(priv, fifo, i)
1485 usbhsf_dma_quit(priv, fifo);
1486}
1// SPDX-License-Identifier: GPL-1.0+
2/*
3 * Renesas USB driver
4 *
5 * Copyright (C) 2011 Renesas Solutions Corp.
6 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7 */
8#include <linux/delay.h>
9#include <linux/io.h>
10#include <linux/scatterlist.h>
11#include "common.h"
12#include "pipe.h"
13
14#define usbhsf_get_cfifo(p) (&((p)->fifo_info.cfifo))
15#define usbhsf_is_cfifo(p, f) (usbhsf_get_cfifo(p) == f)
16
17#define usbhsf_fifo_is_busy(f) ((f)->pipe) /* see usbhs_pipe_select_fifo */
18
19/*
20 * packet initialize
21 */
22void usbhs_pkt_init(struct usbhs_pkt *pkt)
23{
24 INIT_LIST_HEAD(&pkt->node);
25}
26
27/*
28 * packet control function
29 */
30static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
31{
32 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
33 struct device *dev = usbhs_priv_to_dev(priv);
34
35 dev_err(dev, "null handler\n");
36
37 return -EINVAL;
38}
39
40static const struct usbhs_pkt_handle usbhsf_null_handler = {
41 .prepare = usbhsf_null_handle,
42 .try_run = usbhsf_null_handle,
43};
44
45void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
46 void (*done)(struct usbhs_priv *priv,
47 struct usbhs_pkt *pkt),
48 void *buf, int len, int zero, int sequence)
49{
50 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
51 struct device *dev = usbhs_priv_to_dev(priv);
52 unsigned long flags;
53
54 if (!done) {
55 dev_err(dev, "no done function\n");
56 return;
57 }
58
59 /******************** spin lock ********************/
60 usbhs_lock(priv, flags);
61
62 if (!pipe->handler) {
63 dev_err(dev, "no handler function\n");
64 pipe->handler = &usbhsf_null_handler;
65 }
66
67 list_move_tail(&pkt->node, &pipe->list);
68
69 /*
70 * each pkt must hold own handler.
71 * because handler might be changed by its situation.
72 * dma handler -> pio handler.
73 */
74 pkt->pipe = pipe;
75 pkt->buf = buf;
76 pkt->handler = pipe->handler;
77 pkt->length = len;
78 pkt->zero = zero;
79 pkt->actual = 0;
80 pkt->done = done;
81 pkt->sequence = sequence;
82
83 usbhs_unlock(priv, flags);
84 /******************** spin unlock ******************/
85}
86
87static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
88{
89 list_del_init(&pkt->node);
90}
91
92static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
93{
94 return list_first_entry_or_null(&pipe->list, struct usbhs_pkt, node);
95}
96
97static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
98 struct usbhs_fifo *fifo);
99static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
100 struct usbhs_pkt *pkt);
101#define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1)
102#define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
103static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map);
104struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
105{
106 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
107 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
108 unsigned long flags;
109
110 /******************** spin lock ********************/
111 usbhs_lock(priv, flags);
112
113 usbhs_pipe_disable(pipe);
114
115 if (!pkt)
116 pkt = __usbhsf_pkt_get(pipe);
117
118 if (pkt) {
119 struct dma_chan *chan = NULL;
120
121 if (fifo)
122 chan = usbhsf_dma_chan_get(fifo, pkt);
123 if (chan) {
124 dmaengine_terminate_all(chan);
125 usbhsf_dma_unmap(pkt);
126 }
127
128 usbhs_pipe_clear_without_sequence(pipe, 0, 0);
129
130 __usbhsf_pkt_del(pkt);
131 }
132
133 if (fifo)
134 usbhsf_fifo_unselect(pipe, fifo);
135
136 usbhs_unlock(priv, flags);
137 /******************** spin unlock ******************/
138
139 return pkt;
140}
141
142enum {
143 USBHSF_PKT_PREPARE,
144 USBHSF_PKT_TRY_RUN,
145 USBHSF_PKT_DMA_DONE,
146};
147
148static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
149{
150 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
151 struct usbhs_pkt *pkt;
152 struct device *dev = usbhs_priv_to_dev(priv);
153 int (*func)(struct usbhs_pkt *pkt, int *is_done);
154 unsigned long flags;
155 int ret = 0;
156 int is_done = 0;
157
158 /******************** spin lock ********************/
159 usbhs_lock(priv, flags);
160
161 pkt = __usbhsf_pkt_get(pipe);
162 if (!pkt)
163 goto __usbhs_pkt_handler_end;
164
165 switch (type) {
166 case USBHSF_PKT_PREPARE:
167 func = pkt->handler->prepare;
168 break;
169 case USBHSF_PKT_TRY_RUN:
170 func = pkt->handler->try_run;
171 break;
172 case USBHSF_PKT_DMA_DONE:
173 func = pkt->handler->dma_done;
174 break;
175 default:
176 dev_err(dev, "unknown pkt handler\n");
177 goto __usbhs_pkt_handler_end;
178 }
179
180 if (likely(func))
181 ret = func(pkt, &is_done);
182
183 if (is_done)
184 __usbhsf_pkt_del(pkt);
185
186__usbhs_pkt_handler_end:
187 usbhs_unlock(priv, flags);
188 /******************** spin unlock ******************/
189
190 if (is_done) {
191 pkt->done(priv, pkt);
192 usbhs_pkt_start(pipe);
193 }
194
195 return ret;
196}
197
198void usbhs_pkt_start(struct usbhs_pipe *pipe)
199{
200 usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
201}
202
203/*
204 * irq enable/disable function
205 */
206#define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
207#define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
208#define usbhsf_irq_callback_ctrl(pipe, status, enable) \
209 ({ \
210 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); \
211 struct usbhs_mod *mod = usbhs_mod_get_current(priv); \
212 u16 status = (1 << usbhs_pipe_number(pipe)); \
213 if (!mod) \
214 return; \
215 if (enable) \
216 mod->status |= status; \
217 else \
218 mod->status &= ~status; \
219 usbhs_irq_callback_update(priv, mod); \
220 })
221
222static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
223{
224 /*
225 * And DCP pipe can NOT use "ready interrupt" for "send"
226 * it should use "empty" interrupt.
227 * see
228 * "Operation" - "Interrupt Function" - "BRDY Interrupt"
229 *
230 * on the other hand, normal pipe can use "ready interrupt" for "send"
231 * even though it is single/double buffer
232 */
233 if (usbhs_pipe_is_dcp(pipe))
234 usbhsf_irq_empty_ctrl(pipe, enable);
235 else
236 usbhsf_irq_ready_ctrl(pipe, enable);
237}
238
239static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
240{
241 usbhsf_irq_ready_ctrl(pipe, enable);
242}
243
244/*
245 * FIFO ctrl
246 */
247static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
248 struct usbhs_fifo *fifo)
249{
250 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
251
252 usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
253}
254
255static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
256 struct usbhs_fifo *fifo)
257{
258 /* The FIFO port is accessible */
259 if (usbhs_read(priv, fifo->ctr) & FRDY)
260 return 0;
261
262 return -EBUSY;
263}
264
265static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
266 struct usbhs_fifo *fifo)
267{
268 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
269 int ret = 0;
270
271 if (!usbhs_pipe_is_dcp(pipe)) {
272 /*
273 * This driver checks the pipe condition first to avoid -EBUSY
274 * from usbhsf_fifo_barrier() if the pipe is RX direction and
275 * empty.
276 */
277 if (usbhs_pipe_is_dir_in(pipe))
278 ret = usbhs_pipe_is_accessible(pipe);
279 if (!ret)
280 ret = usbhsf_fifo_barrier(priv, fifo);
281 }
282
283 /*
284 * if non-DCP pipe, this driver should set BCLR when
285 * usbhsf_fifo_barrier() returns 0.
286 */
287 if (!ret)
288 usbhs_write(priv, fifo->ctr, BCLR);
289}
290
291static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
292 struct usbhs_fifo *fifo)
293{
294 return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
295}
296
297static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
298 struct usbhs_fifo *fifo)
299{
300 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
301
302 usbhs_pipe_select_fifo(pipe, NULL);
303 usbhs_write(priv, fifo->sel, 0);
304}
305
306static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
307 struct usbhs_fifo *fifo,
308 int write)
309{
310 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
311 struct device *dev = usbhs_priv_to_dev(priv);
312 int timeout = 1024;
313 u16 mask = ((1 << 5) | 0xF); /* mask of ISEL | CURPIPE */
314 u16 base = usbhs_pipe_number(pipe); /* CURPIPE */
315
316 if (usbhs_pipe_is_busy(pipe) ||
317 usbhsf_fifo_is_busy(fifo))
318 return -EBUSY;
319
320 if (usbhs_pipe_is_dcp(pipe)) {
321 base |= (1 == write) << 5; /* ISEL */
322
323 if (usbhs_mod_is_host(priv))
324 usbhs_dcp_dir_for_host(pipe, write);
325 }
326
327 /* "base" will be used below */
328 if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo))
329 usbhs_write(priv, fifo->sel, base);
330 else
331 usbhs_write(priv, fifo->sel, base | MBW_32);
332
333 /* check ISEL and CURPIPE value */
334 while (timeout--) {
335 if (base == (mask & usbhs_read(priv, fifo->sel))) {
336 usbhs_pipe_select_fifo(pipe, fifo);
337 return 0;
338 }
339 udelay(10);
340 }
341
342 dev_err(dev, "fifo select error\n");
343
344 return -EIO;
345}
346
347/*
348 * DCP status stage
349 */
350static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
351{
352 struct usbhs_pipe *pipe = pkt->pipe;
353 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
354 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
355 struct device *dev = usbhs_priv_to_dev(priv);
356 int ret;
357
358 usbhs_pipe_disable(pipe);
359
360 ret = usbhsf_fifo_select(pipe, fifo, 1);
361 if (ret < 0) {
362 dev_err(dev, "%s() faile\n", __func__);
363 return ret;
364 }
365
366 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
367
368 usbhsf_fifo_clear(pipe, fifo);
369 usbhsf_send_terminator(pipe, fifo);
370
371 usbhsf_fifo_unselect(pipe, fifo);
372
373 usbhsf_tx_irq_ctrl(pipe, 1);
374 usbhs_pipe_enable(pipe);
375
376 return ret;
377}
378
379static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
380{
381 struct usbhs_pipe *pipe = pkt->pipe;
382 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
383 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
384 struct device *dev = usbhs_priv_to_dev(priv);
385 int ret;
386
387 usbhs_pipe_disable(pipe);
388
389 ret = usbhsf_fifo_select(pipe, fifo, 0);
390 if (ret < 0) {
391 dev_err(dev, "%s() fail\n", __func__);
392 return ret;
393 }
394
395 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
396 usbhsf_fifo_clear(pipe, fifo);
397
398 usbhsf_fifo_unselect(pipe, fifo);
399
400 usbhsf_rx_irq_ctrl(pipe, 1);
401 usbhs_pipe_enable(pipe);
402
403 return ret;
404
405}
406
407static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
408{
409 struct usbhs_pipe *pipe = pkt->pipe;
410
411 if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
412 usbhsf_tx_irq_ctrl(pipe, 0);
413 else
414 usbhsf_rx_irq_ctrl(pipe, 0);
415
416 pkt->actual = pkt->length;
417 *is_done = 1;
418
419 return 0;
420}
421
422const struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
423 .prepare = usbhs_dcp_dir_switch_to_write,
424 .try_run = usbhs_dcp_dir_switch_done,
425};
426
427const struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
428 .prepare = usbhs_dcp_dir_switch_to_read,
429 .try_run = usbhs_dcp_dir_switch_done,
430};
431
432/*
433 * DCP data stage (push)
434 */
435static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
436{
437 struct usbhs_pipe *pipe = pkt->pipe;
438
439 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
440
441 /*
442 * change handler to PIO push
443 */
444 pkt->handler = &usbhs_fifo_pio_push_handler;
445
446 return pkt->handler->prepare(pkt, is_done);
447}
448
449const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
450 .prepare = usbhsf_dcp_data_stage_try_push,
451};
452
453/*
454 * DCP data stage (pop)
455 */
456static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
457 int *is_done)
458{
459 struct usbhs_pipe *pipe = pkt->pipe;
460 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
461 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
462
463 if (usbhs_pipe_is_busy(pipe))
464 return 0;
465
466 /*
467 * prepare pop for DCP should
468 * - change DCP direction,
469 * - clear fifo
470 * - DATA1
471 */
472 usbhs_pipe_disable(pipe);
473
474 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
475
476 usbhsf_fifo_select(pipe, fifo, 0);
477 usbhsf_fifo_clear(pipe, fifo);
478 usbhsf_fifo_unselect(pipe, fifo);
479
480 /*
481 * change handler to PIO pop
482 */
483 pkt->handler = &usbhs_fifo_pio_pop_handler;
484
485 return pkt->handler->prepare(pkt, is_done);
486}
487
488const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
489 .prepare = usbhsf_dcp_data_stage_prepare_pop,
490};
491
492/*
493 * PIO push handler
494 */
495static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
496{
497 struct usbhs_pipe *pipe = pkt->pipe;
498 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
499 struct device *dev = usbhs_priv_to_dev(priv);
500 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
501 void __iomem *addr = priv->base + fifo->port;
502 u8 *buf;
503 int maxp = usbhs_pipe_get_maxpacket(pipe);
504 int total_len;
505 int i, ret, len;
506 int is_short;
507
508 usbhs_pipe_data_sequence(pipe, pkt->sequence);
509 pkt->sequence = -1; /* -1 sequence will be ignored */
510
511 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
512
513 ret = usbhsf_fifo_select(pipe, fifo, 1);
514 if (ret < 0)
515 return 0;
516
517 ret = usbhs_pipe_is_accessible(pipe);
518 if (ret < 0) {
519 /* inaccessible pipe is not an error */
520 ret = 0;
521 goto usbhs_fifo_write_busy;
522 }
523
524 ret = usbhsf_fifo_barrier(priv, fifo);
525 if (ret < 0)
526 goto usbhs_fifo_write_busy;
527
528 buf = pkt->buf + pkt->actual;
529 len = pkt->length - pkt->actual;
530 len = min(len, maxp);
531 total_len = len;
532 is_short = total_len < maxp;
533
534 /*
535 * FIXME
536 *
537 * 32-bit access only
538 */
539 if (len >= 4 && !((unsigned long)buf & 0x03)) {
540 iowrite32_rep(addr, buf, len / 4);
541 len %= 4;
542 buf += total_len - len;
543 }
544
545 /* the rest operation */
546 for (i = 0; i < len; i++)
547 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
548
549 /*
550 * variable update
551 */
552 pkt->actual += total_len;
553
554 if (pkt->actual < pkt->length)
555 *is_done = 0; /* there are remainder data */
556 else if (is_short)
557 *is_done = 1; /* short packet */
558 else
559 *is_done = !pkt->zero; /* send zero packet ? */
560
561 /*
562 * pipe/irq handling
563 */
564 if (is_short)
565 usbhsf_send_terminator(pipe, fifo);
566
567 usbhsf_tx_irq_ctrl(pipe, !*is_done);
568 usbhs_pipe_running(pipe, !*is_done);
569 usbhs_pipe_enable(pipe);
570
571 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
572 usbhs_pipe_number(pipe),
573 pkt->length, pkt->actual, *is_done, pkt->zero);
574
575 usbhsf_fifo_unselect(pipe, fifo);
576
577 return 0;
578
579usbhs_fifo_write_busy:
580 usbhsf_fifo_unselect(pipe, fifo);
581
582 /*
583 * pipe is busy.
584 * retry in interrupt
585 */
586 usbhsf_tx_irq_ctrl(pipe, 1);
587 usbhs_pipe_running(pipe, 1);
588
589 return ret;
590}
591
592static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
593{
594 if (usbhs_pipe_is_running(pkt->pipe))
595 return 0;
596
597 return usbhsf_pio_try_push(pkt, is_done);
598}
599
600const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
601 .prepare = usbhsf_pio_prepare_push,
602 .try_run = usbhsf_pio_try_push,
603};
604
605/*
606 * PIO pop handler
607 */
608static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
609{
610 struct usbhs_pipe *pipe = pkt->pipe;
611 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
612 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
613
614 if (usbhs_pipe_is_busy(pipe))
615 return 0;
616
617 if (usbhs_pipe_is_running(pipe))
618 return 0;
619
620 /*
621 * pipe enable to prepare packet receive
622 */
623 usbhs_pipe_data_sequence(pipe, pkt->sequence);
624 pkt->sequence = -1; /* -1 sequence will be ignored */
625
626 if (usbhs_pipe_is_dcp(pipe))
627 usbhsf_fifo_clear(pipe, fifo);
628
629 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
630 usbhs_pipe_enable(pipe);
631 usbhs_pipe_running(pipe, 1);
632 usbhsf_rx_irq_ctrl(pipe, 1);
633
634 return 0;
635}
636
637static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
638{
639 struct usbhs_pipe *pipe = pkt->pipe;
640 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
641 struct device *dev = usbhs_priv_to_dev(priv);
642 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
643 void __iomem *addr = priv->base + fifo->port;
644 u8 *buf;
645 u32 data = 0;
646 int maxp = usbhs_pipe_get_maxpacket(pipe);
647 int rcv_len, len;
648 int i, ret;
649 int total_len = 0;
650
651 ret = usbhsf_fifo_select(pipe, fifo, 0);
652 if (ret < 0)
653 return 0;
654
655 ret = usbhsf_fifo_barrier(priv, fifo);
656 if (ret < 0)
657 goto usbhs_fifo_read_busy;
658
659 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
660
661 buf = pkt->buf + pkt->actual;
662 len = pkt->length - pkt->actual;
663 len = min(len, rcv_len);
664 total_len = len;
665
666 /*
667 * update actual length first here to decide disable pipe.
668 * if this pipe keeps BUF status and all data were popped,
669 * then, next interrupt/token will be issued again
670 */
671 pkt->actual += total_len;
672
673 if ((pkt->actual == pkt->length) || /* receive all data */
674 (total_len < maxp)) { /* short packet */
675 *is_done = 1;
676 usbhsf_rx_irq_ctrl(pipe, 0);
677 usbhs_pipe_running(pipe, 0);
678 /*
679 * If function mode, since this controller is possible to enter
680 * Control Write status stage at this timing, this driver
681 * should not disable the pipe. If such a case happens, this
682 * controller is not able to complete the status stage.
683 */
684 if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
685 usbhs_pipe_disable(pipe); /* disable pipe first */
686 }
687
688 /*
689 * Buffer clear if Zero-Length packet
690 *
691 * see
692 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
693 */
694 if (0 == rcv_len) {
695 pkt->zero = 1;
696 usbhsf_fifo_clear(pipe, fifo);
697 goto usbhs_fifo_read_end;
698 }
699
700 /*
701 * FIXME
702 *
703 * 32-bit access only
704 */
705 if (len >= 4 && !((unsigned long)buf & 0x03)) {
706 ioread32_rep(addr, buf, len / 4);
707 len %= 4;
708 buf += total_len - len;
709 }
710
711 /* the rest operation */
712 for (i = 0; i < len; i++) {
713 if (!(i & 0x03))
714 data = ioread32(addr);
715
716 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
717 }
718
719usbhs_fifo_read_end:
720 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
721 usbhs_pipe_number(pipe),
722 pkt->length, pkt->actual, *is_done, pkt->zero);
723
724usbhs_fifo_read_busy:
725 usbhsf_fifo_unselect(pipe, fifo);
726
727 return ret;
728}
729
730const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
731 .prepare = usbhsf_prepare_pop,
732 .try_run = usbhsf_pio_try_pop,
733};
734
735/*
736 * DCP ctrol statge handler
737 */
738static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
739{
740 usbhs_dcp_control_transfer_done(pkt->pipe);
741
742 *is_done = 1;
743
744 return 0;
745}
746
747const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
748 .prepare = usbhsf_ctrl_stage_end,
749 .try_run = usbhsf_ctrl_stage_end,
750};
751
752/*
753 * DMA fifo functions
754 */
755static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
756 struct usbhs_pkt *pkt)
757{
758 if (&usbhs_fifo_dma_push_handler == pkt->handler)
759 return fifo->tx_chan;
760
761 if (&usbhs_fifo_dma_pop_handler == pkt->handler)
762 return fifo->rx_chan;
763
764 return NULL;
765}
766
767static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
768 struct usbhs_pkt *pkt)
769{
770 struct usbhs_fifo *fifo;
771 int i;
772
773 usbhs_for_each_dfifo(priv, fifo, i) {
774 if (usbhsf_dma_chan_get(fifo, pkt) &&
775 !usbhsf_fifo_is_busy(fifo))
776 return fifo;
777 }
778
779 return NULL;
780}
781
782#define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE)
783#define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0)
784static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
785 struct usbhs_fifo *fifo,
786 u16 dreqe)
787{
788 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
789
790 usbhs_bset(priv, fifo->sel, DREQE, dreqe);
791}
792
793static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
794{
795 struct usbhs_pipe *pipe = pkt->pipe;
796 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
797 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
798 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
799 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
800
801 return info->dma_map_ctrl(chan->device->dev, pkt, map);
802}
803
804static void usbhsf_dma_complete(void *arg);
805static void xfer_work(struct work_struct *work)
806{
807 struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
808 struct usbhs_pipe *pipe = pkt->pipe;
809 struct usbhs_fifo *fifo;
810 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
811 struct dma_async_tx_descriptor *desc;
812 struct dma_chan *chan;
813 struct device *dev = usbhs_priv_to_dev(priv);
814 enum dma_transfer_direction dir;
815 unsigned long flags;
816
817 usbhs_lock(priv, flags);
818 fifo = usbhs_pipe_to_fifo(pipe);
819 if (!fifo)
820 goto xfer_work_end;
821
822 chan = usbhsf_dma_chan_get(fifo, pkt);
823 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
824
825 desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
826 pkt->trans, dir,
827 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
828 if (!desc)
829 goto xfer_work_end;
830
831 desc->callback = usbhsf_dma_complete;
832 desc->callback_param = pipe;
833
834 pkt->cookie = dmaengine_submit(desc);
835 if (pkt->cookie < 0) {
836 dev_err(dev, "Failed to submit dma descriptor\n");
837 goto xfer_work_end;
838 }
839
840 dev_dbg(dev, " %s %d (%d/ %d)\n",
841 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
842
843 usbhs_pipe_running(pipe, 1);
844 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
845 dma_async_issue_pending(chan);
846 usbhsf_dma_start(pipe, fifo);
847 usbhs_pipe_enable(pipe);
848
849xfer_work_end:
850 usbhs_unlock(priv, flags);
851}
852
853/*
854 * DMA push handler
855 */
856static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
857{
858 struct usbhs_pipe *pipe = pkt->pipe;
859 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
860 struct usbhs_fifo *fifo;
861 int len = pkt->length - pkt->actual;
862 int ret;
863 uintptr_t align_mask;
864
865 if (usbhs_pipe_is_busy(pipe))
866 return 0;
867
868 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
869 if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
870 usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
871 goto usbhsf_pio_prepare_push;
872
873 /* check data length if this driver don't use USB-DMAC */
874 if (!usbhs_get_dparam(priv, has_usb_dmac) && len & 0x7)
875 goto usbhsf_pio_prepare_push;
876
877 /* check buffer alignment */
878 align_mask = usbhs_get_dparam(priv, has_usb_dmac) ?
879 USBHS_USB_DMAC_XFER_SIZE - 1 : 0x7;
880 if ((uintptr_t)(pkt->buf + pkt->actual) & align_mask)
881 goto usbhsf_pio_prepare_push;
882
883 /* return at this time if the pipe is running */
884 if (usbhs_pipe_is_running(pipe))
885 return 0;
886
887 /* get enable DMA fifo */
888 fifo = usbhsf_get_dma_fifo(priv, pkt);
889 if (!fifo)
890 goto usbhsf_pio_prepare_push;
891
892 ret = usbhsf_fifo_select(pipe, fifo, 0);
893 if (ret < 0)
894 goto usbhsf_pio_prepare_push;
895
896 if (usbhsf_dma_map(pkt) < 0)
897 goto usbhsf_pio_prepare_push_unselect;
898
899 pkt->trans = len;
900
901 usbhsf_tx_irq_ctrl(pipe, 0);
902 INIT_WORK(&pkt->work, xfer_work);
903 schedule_work(&pkt->work);
904
905 return 0;
906
907usbhsf_pio_prepare_push_unselect:
908 usbhsf_fifo_unselect(pipe, fifo);
909usbhsf_pio_prepare_push:
910 /*
911 * change handler to PIO
912 */
913 pkt->handler = &usbhs_fifo_pio_push_handler;
914
915 return pkt->handler->prepare(pkt, is_done);
916}
917
918static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
919{
920 struct usbhs_pipe *pipe = pkt->pipe;
921 int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
922
923 pkt->actual += pkt->trans;
924
925 if (pkt->actual < pkt->length)
926 *is_done = 0; /* there are remainder data */
927 else if (is_short)
928 *is_done = 1; /* short packet */
929 else
930 *is_done = !pkt->zero; /* send zero packet? */
931
932 usbhs_pipe_running(pipe, !*is_done);
933
934 usbhsf_dma_stop(pipe, pipe->fifo);
935 usbhsf_dma_unmap(pkt);
936 usbhsf_fifo_unselect(pipe, pipe->fifo);
937
938 if (!*is_done) {
939 /* change handler to PIO */
940 pkt->handler = &usbhs_fifo_pio_push_handler;
941 return pkt->handler->try_run(pkt, is_done);
942 }
943
944 return 0;
945}
946
947const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
948 .prepare = usbhsf_dma_prepare_push,
949 .dma_done = usbhsf_dma_push_done,
950};
951
952/*
953 * DMA pop handler
954 */
955
956static int usbhsf_dma_prepare_pop_with_rx_irq(struct usbhs_pkt *pkt,
957 int *is_done)
958{
959 return usbhsf_prepare_pop(pkt, is_done);
960}
961
962static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
963 int *is_done)
964{
965 struct usbhs_pipe *pipe = pkt->pipe;
966 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
967 struct usbhs_fifo *fifo;
968 int ret;
969
970 if (usbhs_pipe_is_busy(pipe))
971 return 0;
972
973 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
974 if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
975 usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
976 goto usbhsf_pio_prepare_pop;
977
978 fifo = usbhsf_get_dma_fifo(priv, pkt);
979 if (!fifo)
980 goto usbhsf_pio_prepare_pop;
981
982 if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
983 goto usbhsf_pio_prepare_pop;
984
985 /* return at this time if the pipe is running */
986 if (usbhs_pipe_is_running(pipe))
987 return 0;
988
989 usbhs_pipe_config_change_bfre(pipe, 1);
990
991 ret = usbhsf_fifo_select(pipe, fifo, 0);
992 if (ret < 0)
993 goto usbhsf_pio_prepare_pop;
994
995 if (usbhsf_dma_map(pkt) < 0)
996 goto usbhsf_pio_prepare_pop_unselect;
997
998 /* DMA */
999
1000 /*
1001 * usbhs_fifo_dma_pop_handler :: prepare
1002 * enabled irq to come here.
1003 * but it is no longer needed for DMA. disable it.
1004 */
1005 usbhsf_rx_irq_ctrl(pipe, 0);
1006
1007 pkt->trans = pkt->length;
1008
1009 INIT_WORK(&pkt->work, xfer_work);
1010 schedule_work(&pkt->work);
1011
1012 return 0;
1013
1014usbhsf_pio_prepare_pop_unselect:
1015 usbhsf_fifo_unselect(pipe, fifo);
1016usbhsf_pio_prepare_pop:
1017
1018 /*
1019 * change handler to PIO
1020 */
1021 pkt->handler = &usbhs_fifo_pio_pop_handler;
1022 usbhs_pipe_config_change_bfre(pipe, 0);
1023
1024 return pkt->handler->prepare(pkt, is_done);
1025}
1026
1027static int usbhsf_dma_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
1028{
1029 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1030
1031 if (usbhs_get_dparam(priv, has_usb_dmac))
1032 return usbhsf_dma_prepare_pop_with_usb_dmac(pkt, is_done);
1033 else
1034 return usbhsf_dma_prepare_pop_with_rx_irq(pkt, is_done);
1035}
1036
1037static int usbhsf_dma_try_pop_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1038{
1039 struct usbhs_pipe *pipe = pkt->pipe;
1040 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1041 struct usbhs_fifo *fifo;
1042 int len, ret;
1043
1044 if (usbhs_pipe_is_busy(pipe))
1045 return 0;
1046
1047 if (usbhs_pipe_is_dcp(pipe))
1048 goto usbhsf_pio_prepare_pop;
1049
1050 /* get enable DMA fifo */
1051 fifo = usbhsf_get_dma_fifo(priv, pkt);
1052 if (!fifo)
1053 goto usbhsf_pio_prepare_pop;
1054
1055 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
1056 goto usbhsf_pio_prepare_pop;
1057
1058 ret = usbhsf_fifo_select(pipe, fifo, 0);
1059 if (ret < 0)
1060 goto usbhsf_pio_prepare_pop;
1061
1062 /* use PIO if packet is less than pio_dma_border */
1063 len = usbhsf_fifo_rcv_len(priv, fifo);
1064 len = min(pkt->length - pkt->actual, len);
1065 if (len & 0x7) /* 8byte alignment */
1066 goto usbhsf_pio_prepare_pop_unselect;
1067
1068 if (len < usbhs_get_dparam(priv, pio_dma_border))
1069 goto usbhsf_pio_prepare_pop_unselect;
1070
1071 ret = usbhsf_fifo_barrier(priv, fifo);
1072 if (ret < 0)
1073 goto usbhsf_pio_prepare_pop_unselect;
1074
1075 if (usbhsf_dma_map(pkt) < 0)
1076 goto usbhsf_pio_prepare_pop_unselect;
1077
1078 /* DMA */
1079
1080 /*
1081 * usbhs_fifo_dma_pop_handler :: prepare
1082 * enabled irq to come here.
1083 * but it is no longer needed for DMA. disable it.
1084 */
1085 usbhsf_rx_irq_ctrl(pipe, 0);
1086
1087 pkt->trans = len;
1088
1089 INIT_WORK(&pkt->work, xfer_work);
1090 schedule_work(&pkt->work);
1091
1092 return 0;
1093
1094usbhsf_pio_prepare_pop_unselect:
1095 usbhsf_fifo_unselect(pipe, fifo);
1096usbhsf_pio_prepare_pop:
1097
1098 /*
1099 * change handler to PIO
1100 */
1101 pkt->handler = &usbhs_fifo_pio_pop_handler;
1102
1103 return pkt->handler->try_run(pkt, is_done);
1104}
1105
1106static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
1107{
1108 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1109
1110 BUG_ON(usbhs_get_dparam(priv, has_usb_dmac));
1111
1112 return usbhsf_dma_try_pop_with_rx_irq(pkt, is_done);
1113}
1114
1115static int usbhsf_dma_pop_done_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1116{
1117 struct usbhs_pipe *pipe = pkt->pipe;
1118 int maxp = usbhs_pipe_get_maxpacket(pipe);
1119
1120 usbhsf_dma_stop(pipe, pipe->fifo);
1121 usbhsf_dma_unmap(pkt);
1122 usbhsf_fifo_unselect(pipe, pipe->fifo);
1123
1124 pkt->actual += pkt->trans;
1125
1126 if ((pkt->actual == pkt->length) || /* receive all data */
1127 (pkt->trans < maxp)) { /* short packet */
1128 *is_done = 1;
1129 usbhs_pipe_running(pipe, 0);
1130 } else {
1131 /* re-enable */
1132 usbhs_pipe_running(pipe, 0);
1133 usbhsf_prepare_pop(pkt, is_done);
1134 }
1135
1136 return 0;
1137}
1138
1139static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
1140 struct dma_chan *chan, int dtln)
1141{
1142 struct usbhs_pipe *pipe = pkt->pipe;
1143 struct dma_tx_state state;
1144 size_t received_size;
1145 int maxp = usbhs_pipe_get_maxpacket(pipe);
1146
1147 dmaengine_tx_status(chan, pkt->cookie, &state);
1148 received_size = pkt->length - state.residue;
1149
1150 if (dtln) {
1151 received_size -= USBHS_USB_DMAC_XFER_SIZE;
1152 received_size &= ~(maxp - 1);
1153 received_size += dtln;
1154 }
1155
1156 return received_size;
1157}
1158
1159static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
1160 int *is_done)
1161{
1162 struct usbhs_pipe *pipe = pkt->pipe;
1163 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1164 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
1165 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
1166 int rcv_len;
1167
1168 /*
1169 * Since the driver disables rx_irq in DMA mode, the interrupt handler
1170 * cannot the BRDYSTS. So, the function clears it here because the
1171 * driver may use PIO mode next time.
1172 */
1173 usbhs_xxxsts_clear(priv, BRDYSTS, usbhs_pipe_number(pipe));
1174
1175 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
1176 usbhsf_fifo_clear(pipe, fifo);
1177 pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
1178
1179 usbhs_pipe_running(pipe, 0);
1180 usbhsf_dma_stop(pipe, fifo);
1181 usbhsf_dma_unmap(pkt);
1182 usbhsf_fifo_unselect(pipe, pipe->fifo);
1183
1184 /* The driver can assume the rx transaction is always "done" */
1185 *is_done = 1;
1186
1187 return 0;
1188}
1189
1190static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
1191{
1192 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1193
1194 if (usbhs_get_dparam(priv, has_usb_dmac))
1195 return usbhsf_dma_pop_done_with_usb_dmac(pkt, is_done);
1196 else
1197 return usbhsf_dma_pop_done_with_rx_irq(pkt, is_done);
1198}
1199
1200const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
1201 .prepare = usbhsf_dma_prepare_pop,
1202 .try_run = usbhsf_dma_try_pop,
1203 .dma_done = usbhsf_dma_pop_done
1204};
1205
1206/*
1207 * DMA setting
1208 */
1209static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
1210{
1211 struct sh_dmae_slave *slave = param;
1212
1213 /*
1214 * FIXME
1215 *
1216 * usbhs doesn't recognize id = 0 as valid DMA
1217 */
1218 if (0 == slave->shdma_slave.slave_id)
1219 return false;
1220
1221 chan->private = slave;
1222
1223 return true;
1224}
1225
1226static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1227{
1228 if (fifo->tx_chan)
1229 dma_release_channel(fifo->tx_chan);
1230 if (fifo->rx_chan)
1231 dma_release_channel(fifo->rx_chan);
1232
1233 fifo->tx_chan = NULL;
1234 fifo->rx_chan = NULL;
1235}
1236
1237static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
1238{
1239 dma_cap_mask_t mask;
1240
1241 dma_cap_zero(mask);
1242 dma_cap_set(DMA_SLAVE, mask);
1243 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1244 &fifo->tx_slave);
1245
1246 dma_cap_zero(mask);
1247 dma_cap_set(DMA_SLAVE, mask);
1248 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1249 &fifo->rx_slave);
1250}
1251
1252static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
1253 int channel)
1254{
1255 char name[16];
1256
1257 /*
1258 * To avoid complex handing for DnFIFOs, the driver uses each
1259 * DnFIFO as TX or RX direction (not bi-direction).
1260 * So, the driver uses odd channels for TX, even channels for RX.
1261 */
1262 snprintf(name, sizeof(name), "ch%d", channel);
1263 if (channel & 1) {
1264 fifo->tx_chan = dma_request_slave_channel_reason(dev, name);
1265 if (IS_ERR(fifo->tx_chan))
1266 fifo->tx_chan = NULL;
1267 } else {
1268 fifo->rx_chan = dma_request_slave_channel_reason(dev, name);
1269 if (IS_ERR(fifo->rx_chan))
1270 fifo->rx_chan = NULL;
1271 }
1272}
1273
1274static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
1275 int channel)
1276{
1277 struct device *dev = usbhs_priv_to_dev(priv);
1278
1279 if (dev->of_node)
1280 usbhsf_dma_init_dt(dev, fifo, channel);
1281 else
1282 usbhsf_dma_init_pdev(fifo);
1283
1284 if (fifo->tx_chan || fifo->rx_chan)
1285 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1286 fifo->name,
1287 fifo->tx_chan ? "[TX]" : " ",
1288 fifo->rx_chan ? "[RX]" : " ");
1289}
1290
1291/*
1292 * irq functions
1293 */
1294static int usbhsf_irq_empty(struct usbhs_priv *priv,
1295 struct usbhs_irq_state *irq_state)
1296{
1297 struct usbhs_pipe *pipe;
1298 struct device *dev = usbhs_priv_to_dev(priv);
1299 int i, ret;
1300
1301 if (!irq_state->bempsts) {
1302 dev_err(dev, "debug %s !!\n", __func__);
1303 return -EIO;
1304 }
1305
1306 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1307
1308 /*
1309 * search interrupted "pipe"
1310 * not "uep".
1311 */
1312 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1313 if (!(irq_state->bempsts & (1 << i)))
1314 continue;
1315
1316 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1317 if (ret < 0)
1318 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1319 }
1320
1321 return 0;
1322}
1323
1324static int usbhsf_irq_ready(struct usbhs_priv *priv,
1325 struct usbhs_irq_state *irq_state)
1326{
1327 struct usbhs_pipe *pipe;
1328 struct device *dev = usbhs_priv_to_dev(priv);
1329 int i, ret;
1330
1331 if (!irq_state->brdysts) {
1332 dev_err(dev, "debug %s !!\n", __func__);
1333 return -EIO;
1334 }
1335
1336 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1337
1338 /*
1339 * search interrupted "pipe"
1340 * not "uep".
1341 */
1342 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1343 if (!(irq_state->brdysts & (1 << i)))
1344 continue;
1345
1346 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1347 if (ret < 0)
1348 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1349 }
1350
1351 return 0;
1352}
1353
1354static void usbhsf_dma_complete(void *arg)
1355{
1356 struct usbhs_pipe *pipe = arg;
1357 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1358 struct device *dev = usbhs_priv_to_dev(priv);
1359 int ret;
1360
1361 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1362 if (ret < 0)
1363 dev_err(dev, "dma_complete run_error %d : %d\n",
1364 usbhs_pipe_number(pipe), ret);
1365}
1366
1367void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe)
1368{
1369 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1370 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
1371
1372 /* clear DCP FIFO of transmission */
1373 if (usbhsf_fifo_select(pipe, fifo, 1) < 0)
1374 return;
1375 usbhsf_fifo_clear(pipe, fifo);
1376 usbhsf_fifo_unselect(pipe, fifo);
1377
1378 /* clear DCP FIFO of reception */
1379 if (usbhsf_fifo_select(pipe, fifo, 0) < 0)
1380 return;
1381 usbhsf_fifo_clear(pipe, fifo);
1382 usbhsf_fifo_unselect(pipe, fifo);
1383}
1384
1385/*
1386 * fifo init
1387 */
1388void usbhs_fifo_init(struct usbhs_priv *priv)
1389{
1390 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1391 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1392 struct usbhs_fifo *dfifo;
1393 int i;
1394
1395 mod->irq_empty = usbhsf_irq_empty;
1396 mod->irq_ready = usbhsf_irq_ready;
1397 mod->irq_bempsts = 0;
1398 mod->irq_brdysts = 0;
1399
1400 cfifo->pipe = NULL;
1401 usbhs_for_each_dfifo(priv, dfifo, i)
1402 dfifo->pipe = NULL;
1403}
1404
1405void usbhs_fifo_quit(struct usbhs_priv *priv)
1406{
1407 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1408
1409 mod->irq_empty = NULL;
1410 mod->irq_ready = NULL;
1411 mod->irq_bempsts = 0;
1412 mod->irq_brdysts = 0;
1413}
1414
1415#define __USBHS_DFIFO_INIT(priv, fifo, channel, fifo_port) \
1416do { \
1417 fifo = usbhsf_get_dnfifo(priv, channel); \
1418 fifo->name = "D"#channel"FIFO"; \
1419 fifo->port = fifo_port; \
1420 fifo->sel = D##channel##FIFOSEL; \
1421 fifo->ctr = D##channel##FIFOCTR; \
1422 fifo->tx_slave.shdma_slave.slave_id = \
1423 usbhs_get_dparam(priv, d##channel##_tx_id); \
1424 fifo->rx_slave.shdma_slave.slave_id = \
1425 usbhs_get_dparam(priv, d##channel##_rx_id); \
1426 usbhsf_dma_init(priv, fifo, channel); \
1427} while (0)
1428
1429#define USBHS_DFIFO_INIT(priv, fifo, channel) \
1430 __USBHS_DFIFO_INIT(priv, fifo, channel, D##channel##FIFO)
1431#define USBHS_DFIFO_INIT_NO_PORT(priv, fifo, channel) \
1432 __USBHS_DFIFO_INIT(priv, fifo, channel, 0)
1433
1434int usbhs_fifo_probe(struct usbhs_priv *priv)
1435{
1436 struct usbhs_fifo *fifo;
1437
1438 /* CFIFO */
1439 fifo = usbhsf_get_cfifo(priv);
1440 fifo->name = "CFIFO";
1441 fifo->port = CFIFO;
1442 fifo->sel = CFIFOSEL;
1443 fifo->ctr = CFIFOCTR;
1444
1445 /* DFIFO */
1446 USBHS_DFIFO_INIT(priv, fifo, 0);
1447 USBHS_DFIFO_INIT(priv, fifo, 1);
1448 USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 2);
1449 USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 3);
1450
1451 return 0;
1452}
1453
1454void usbhs_fifo_remove(struct usbhs_priv *priv)
1455{
1456 struct usbhs_fifo *fifo;
1457 int i;
1458
1459 usbhs_for_each_dfifo(priv, fifo, i)
1460 usbhsf_dma_quit(priv, fifo);
1461}