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1/*
2 * Renesas USB driver
3 *
4 * Copyright (C) 2011 Renesas Solutions Corp.
5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
15 *
16 */
17#include <linux/delay.h>
18#include <linux/io.h>
19#include <linux/scatterlist.h>
20#include "common.h"
21#include "pipe.h"
22
23#define usbhsf_get_cfifo(p) (&((p)->fifo_info.cfifo))
24#define usbhsf_is_cfifo(p, f) (usbhsf_get_cfifo(p) == f)
25
26#define usbhsf_fifo_is_busy(f) ((f)->pipe) /* see usbhs_pipe_select_fifo */
27
28/*
29 * packet initialize
30 */
31void usbhs_pkt_init(struct usbhs_pkt *pkt)
32{
33 INIT_LIST_HEAD(&pkt->node);
34}
35
36/*
37 * packet control function
38 */
39static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
40{
41 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
42 struct device *dev = usbhs_priv_to_dev(priv);
43
44 dev_err(dev, "null handler\n");
45
46 return -EINVAL;
47}
48
49static const struct usbhs_pkt_handle usbhsf_null_handler = {
50 .prepare = usbhsf_null_handle,
51 .try_run = usbhsf_null_handle,
52};
53
54void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
55 void (*done)(struct usbhs_priv *priv,
56 struct usbhs_pkt *pkt),
57 void *buf, int len, int zero, int sequence)
58{
59 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
60 struct device *dev = usbhs_priv_to_dev(priv);
61 unsigned long flags;
62
63 if (!done) {
64 dev_err(dev, "no done function\n");
65 return;
66 }
67
68 /******************** spin lock ********************/
69 usbhs_lock(priv, flags);
70
71 if (!pipe->handler) {
72 dev_err(dev, "no handler function\n");
73 pipe->handler = &usbhsf_null_handler;
74 }
75
76 list_move_tail(&pkt->node, &pipe->list);
77
78 /*
79 * each pkt must hold own handler.
80 * because handler might be changed by its situation.
81 * dma handler -> pio handler.
82 */
83 pkt->pipe = pipe;
84 pkt->buf = buf;
85 pkt->handler = pipe->handler;
86 pkt->length = len;
87 pkt->zero = zero;
88 pkt->actual = 0;
89 pkt->done = done;
90 pkt->sequence = sequence;
91
92 usbhs_unlock(priv, flags);
93 /******************** spin unlock ******************/
94}
95
96static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
97{
98 list_del_init(&pkt->node);
99}
100
101static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
102{
103 if (list_empty(&pipe->list))
104 return NULL;
105
106 return list_first_entry(&pipe->list, struct usbhs_pkt, node);
107}
108
109static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
110 struct usbhs_fifo *fifo);
111static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
112 struct usbhs_fifo *fifo);
113static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
114 struct usbhs_pkt *pkt);
115#define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1)
116#define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
117static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map);
118struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
119{
120 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
121 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
122 unsigned long flags;
123
124 /******************** spin lock ********************/
125 usbhs_lock(priv, flags);
126
127 usbhs_pipe_disable(pipe);
128
129 if (!pkt)
130 pkt = __usbhsf_pkt_get(pipe);
131
132 if (pkt) {
133 struct dma_chan *chan = NULL;
134
135 if (fifo)
136 chan = usbhsf_dma_chan_get(fifo, pkt);
137 if (chan) {
138 dmaengine_terminate_all(chan);
139 usbhsf_fifo_clear(pipe, fifo);
140 usbhsf_dma_unmap(pkt);
141 }
142
143 __usbhsf_pkt_del(pkt);
144 }
145
146 if (fifo)
147 usbhsf_fifo_unselect(pipe, fifo);
148
149 usbhs_unlock(priv, flags);
150 /******************** spin unlock ******************/
151
152 return pkt;
153}
154
155enum {
156 USBHSF_PKT_PREPARE,
157 USBHSF_PKT_TRY_RUN,
158 USBHSF_PKT_DMA_DONE,
159};
160
161static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
162{
163 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
164 struct usbhs_pkt *pkt;
165 struct device *dev = usbhs_priv_to_dev(priv);
166 int (*func)(struct usbhs_pkt *pkt, int *is_done);
167 unsigned long flags;
168 int ret = 0;
169 int is_done = 0;
170
171 /******************** spin lock ********************/
172 usbhs_lock(priv, flags);
173
174 pkt = __usbhsf_pkt_get(pipe);
175 if (!pkt)
176 goto __usbhs_pkt_handler_end;
177
178 switch (type) {
179 case USBHSF_PKT_PREPARE:
180 func = pkt->handler->prepare;
181 break;
182 case USBHSF_PKT_TRY_RUN:
183 func = pkt->handler->try_run;
184 break;
185 case USBHSF_PKT_DMA_DONE:
186 func = pkt->handler->dma_done;
187 break;
188 default:
189 dev_err(dev, "unknown pkt handler\n");
190 goto __usbhs_pkt_handler_end;
191 }
192
193 if (likely(func))
194 ret = func(pkt, &is_done);
195
196 if (is_done)
197 __usbhsf_pkt_del(pkt);
198
199__usbhs_pkt_handler_end:
200 usbhs_unlock(priv, flags);
201 /******************** spin unlock ******************/
202
203 if (is_done) {
204 pkt->done(priv, pkt);
205 usbhs_pkt_start(pipe);
206 }
207
208 return ret;
209}
210
211void usbhs_pkt_start(struct usbhs_pipe *pipe)
212{
213 usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
214}
215
216/*
217 * irq enable/disable function
218 */
219#define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
220#define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
221#define usbhsf_irq_callback_ctrl(pipe, status, enable) \
222 ({ \
223 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); \
224 struct usbhs_mod *mod = usbhs_mod_get_current(priv); \
225 u16 status = (1 << usbhs_pipe_number(pipe)); \
226 if (!mod) \
227 return; \
228 if (enable) \
229 mod->status |= status; \
230 else \
231 mod->status &= ~status; \
232 usbhs_irq_callback_update(priv, mod); \
233 })
234
235static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
236{
237 /*
238 * And DCP pipe can NOT use "ready interrupt" for "send"
239 * it should use "empty" interrupt.
240 * see
241 * "Operation" - "Interrupt Function" - "BRDY Interrupt"
242 *
243 * on the other hand, normal pipe can use "ready interrupt" for "send"
244 * even though it is single/double buffer
245 */
246 if (usbhs_pipe_is_dcp(pipe))
247 usbhsf_irq_empty_ctrl(pipe, enable);
248 else
249 usbhsf_irq_ready_ctrl(pipe, enable);
250}
251
252static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
253{
254 usbhsf_irq_ready_ctrl(pipe, enable);
255}
256
257/*
258 * FIFO ctrl
259 */
260static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
261 struct usbhs_fifo *fifo)
262{
263 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
264
265 usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
266}
267
268static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
269 struct usbhs_fifo *fifo)
270{
271 int timeout = 1024;
272
273 do {
274 /* The FIFO port is accessible */
275 if (usbhs_read(priv, fifo->ctr) & FRDY)
276 return 0;
277
278 udelay(10);
279 } while (timeout--);
280
281 return -EBUSY;
282}
283
284static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
285 struct usbhs_fifo *fifo)
286{
287 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
288
289 if (!usbhs_pipe_is_dcp(pipe))
290 usbhsf_fifo_barrier(priv, fifo);
291
292 usbhs_write(priv, fifo->ctr, BCLR);
293}
294
295static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
296 struct usbhs_fifo *fifo)
297{
298 return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
299}
300
301static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
302 struct usbhs_fifo *fifo)
303{
304 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
305
306 usbhs_pipe_select_fifo(pipe, NULL);
307 usbhs_write(priv, fifo->sel, 0);
308}
309
310static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
311 struct usbhs_fifo *fifo,
312 int write)
313{
314 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
315 struct device *dev = usbhs_priv_to_dev(priv);
316 int timeout = 1024;
317 u16 mask = ((1 << 5) | 0xF); /* mask of ISEL | CURPIPE */
318 u16 base = usbhs_pipe_number(pipe); /* CURPIPE */
319
320 if (usbhs_pipe_is_busy(pipe) ||
321 usbhsf_fifo_is_busy(fifo))
322 return -EBUSY;
323
324 if (usbhs_pipe_is_dcp(pipe)) {
325 base |= (1 == write) << 5; /* ISEL */
326
327 if (usbhs_mod_is_host(priv))
328 usbhs_dcp_dir_for_host(pipe, write);
329 }
330
331 /* "base" will be used below */
332 if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo))
333 usbhs_write(priv, fifo->sel, base);
334 else
335 usbhs_write(priv, fifo->sel, base | MBW_32);
336
337 /* check ISEL and CURPIPE value */
338 while (timeout--) {
339 if (base == (mask & usbhs_read(priv, fifo->sel))) {
340 usbhs_pipe_select_fifo(pipe, fifo);
341 return 0;
342 }
343 udelay(10);
344 }
345
346 dev_err(dev, "fifo select error\n");
347
348 return -EIO;
349}
350
351/*
352 * DCP status stage
353 */
354static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
355{
356 struct usbhs_pipe *pipe = pkt->pipe;
357 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
358 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
359 struct device *dev = usbhs_priv_to_dev(priv);
360 int ret;
361
362 usbhs_pipe_disable(pipe);
363
364 ret = usbhsf_fifo_select(pipe, fifo, 1);
365 if (ret < 0) {
366 dev_err(dev, "%s() faile\n", __func__);
367 return ret;
368 }
369
370 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
371
372 usbhsf_fifo_clear(pipe, fifo);
373 usbhsf_send_terminator(pipe, fifo);
374
375 usbhsf_fifo_unselect(pipe, fifo);
376
377 usbhsf_tx_irq_ctrl(pipe, 1);
378 usbhs_pipe_enable(pipe);
379
380 return ret;
381}
382
383static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
384{
385 struct usbhs_pipe *pipe = pkt->pipe;
386 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
387 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
388 struct device *dev = usbhs_priv_to_dev(priv);
389 int ret;
390
391 usbhs_pipe_disable(pipe);
392
393 ret = usbhsf_fifo_select(pipe, fifo, 0);
394 if (ret < 0) {
395 dev_err(dev, "%s() fail\n", __func__);
396 return ret;
397 }
398
399 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
400 usbhsf_fifo_clear(pipe, fifo);
401
402 usbhsf_fifo_unselect(pipe, fifo);
403
404 usbhsf_rx_irq_ctrl(pipe, 1);
405 usbhs_pipe_enable(pipe);
406
407 return ret;
408
409}
410
411static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
412{
413 struct usbhs_pipe *pipe = pkt->pipe;
414
415 if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
416 usbhsf_tx_irq_ctrl(pipe, 0);
417 else
418 usbhsf_rx_irq_ctrl(pipe, 0);
419
420 pkt->actual = pkt->length;
421 *is_done = 1;
422
423 return 0;
424}
425
426const struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
427 .prepare = usbhs_dcp_dir_switch_to_write,
428 .try_run = usbhs_dcp_dir_switch_done,
429};
430
431const struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
432 .prepare = usbhs_dcp_dir_switch_to_read,
433 .try_run = usbhs_dcp_dir_switch_done,
434};
435
436/*
437 * DCP data stage (push)
438 */
439static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
440{
441 struct usbhs_pipe *pipe = pkt->pipe;
442
443 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
444
445 /*
446 * change handler to PIO push
447 */
448 pkt->handler = &usbhs_fifo_pio_push_handler;
449
450 return pkt->handler->prepare(pkt, is_done);
451}
452
453const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
454 .prepare = usbhsf_dcp_data_stage_try_push,
455};
456
457/*
458 * DCP data stage (pop)
459 */
460static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
461 int *is_done)
462{
463 struct usbhs_pipe *pipe = pkt->pipe;
464 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
465 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
466
467 if (usbhs_pipe_is_busy(pipe))
468 return 0;
469
470 /*
471 * prepare pop for DCP should
472 * - change DCP direction,
473 * - clear fifo
474 * - DATA1
475 */
476 usbhs_pipe_disable(pipe);
477
478 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
479
480 usbhsf_fifo_select(pipe, fifo, 0);
481 usbhsf_fifo_clear(pipe, fifo);
482 usbhsf_fifo_unselect(pipe, fifo);
483
484 /*
485 * change handler to PIO pop
486 */
487 pkt->handler = &usbhs_fifo_pio_pop_handler;
488
489 return pkt->handler->prepare(pkt, is_done);
490}
491
492const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
493 .prepare = usbhsf_dcp_data_stage_prepare_pop,
494};
495
496/*
497 * PIO push handler
498 */
499static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
500{
501 struct usbhs_pipe *pipe = pkt->pipe;
502 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
503 struct device *dev = usbhs_priv_to_dev(priv);
504 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
505 void __iomem *addr = priv->base + fifo->port;
506 u8 *buf;
507 int maxp = usbhs_pipe_get_maxpacket(pipe);
508 int total_len;
509 int i, ret, len;
510 int is_short;
511
512 usbhs_pipe_data_sequence(pipe, pkt->sequence);
513 pkt->sequence = -1; /* -1 sequence will be ignored */
514
515 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
516
517 ret = usbhsf_fifo_select(pipe, fifo, 1);
518 if (ret < 0)
519 return 0;
520
521 ret = usbhs_pipe_is_accessible(pipe);
522 if (ret < 0) {
523 /* inaccessible pipe is not an error */
524 ret = 0;
525 goto usbhs_fifo_write_busy;
526 }
527
528 ret = usbhsf_fifo_barrier(priv, fifo);
529 if (ret < 0)
530 goto usbhs_fifo_write_busy;
531
532 buf = pkt->buf + pkt->actual;
533 len = pkt->length - pkt->actual;
534 len = min(len, maxp);
535 total_len = len;
536 is_short = total_len < maxp;
537
538 /*
539 * FIXME
540 *
541 * 32-bit access only
542 */
543 if (len >= 4 && !((unsigned long)buf & 0x03)) {
544 iowrite32_rep(addr, buf, len / 4);
545 len %= 4;
546 buf += total_len - len;
547 }
548
549 /* the rest operation */
550 for (i = 0; i < len; i++)
551 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
552
553 /*
554 * variable update
555 */
556 pkt->actual += total_len;
557
558 if (pkt->actual < pkt->length)
559 *is_done = 0; /* there are remainder data */
560 else if (is_short)
561 *is_done = 1; /* short packet */
562 else
563 *is_done = !pkt->zero; /* send zero packet ? */
564
565 /*
566 * pipe/irq handling
567 */
568 if (is_short)
569 usbhsf_send_terminator(pipe, fifo);
570
571 usbhsf_tx_irq_ctrl(pipe, !*is_done);
572 usbhs_pipe_running(pipe, !*is_done);
573 usbhs_pipe_enable(pipe);
574
575 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
576 usbhs_pipe_number(pipe),
577 pkt->length, pkt->actual, *is_done, pkt->zero);
578
579 usbhsf_fifo_unselect(pipe, fifo);
580
581 return 0;
582
583usbhs_fifo_write_busy:
584 usbhsf_fifo_unselect(pipe, fifo);
585
586 /*
587 * pipe is busy.
588 * retry in interrupt
589 */
590 usbhsf_tx_irq_ctrl(pipe, 1);
591 usbhs_pipe_running(pipe, 1);
592
593 return ret;
594}
595
596static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
597{
598 if (usbhs_pipe_is_running(pkt->pipe))
599 return 0;
600
601 return usbhsf_pio_try_push(pkt, is_done);
602}
603
604const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
605 .prepare = usbhsf_pio_prepare_push,
606 .try_run = usbhsf_pio_try_push,
607};
608
609/*
610 * PIO pop handler
611 */
612static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
613{
614 struct usbhs_pipe *pipe = pkt->pipe;
615 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
616 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
617
618 if (usbhs_pipe_is_busy(pipe))
619 return 0;
620
621 if (usbhs_pipe_is_running(pipe))
622 return 0;
623
624 /*
625 * pipe enable to prepare packet receive
626 */
627 usbhs_pipe_data_sequence(pipe, pkt->sequence);
628 pkt->sequence = -1; /* -1 sequence will be ignored */
629
630 if (usbhs_pipe_is_dcp(pipe))
631 usbhsf_fifo_clear(pipe, fifo);
632
633 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
634 usbhs_pipe_enable(pipe);
635 usbhs_pipe_running(pipe, 1);
636 usbhsf_rx_irq_ctrl(pipe, 1);
637
638 return 0;
639}
640
641static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
642{
643 struct usbhs_pipe *pipe = pkt->pipe;
644 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
645 struct device *dev = usbhs_priv_to_dev(priv);
646 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
647 void __iomem *addr = priv->base + fifo->port;
648 u8 *buf;
649 u32 data = 0;
650 int maxp = usbhs_pipe_get_maxpacket(pipe);
651 int rcv_len, len;
652 int i, ret;
653 int total_len = 0;
654
655 ret = usbhsf_fifo_select(pipe, fifo, 0);
656 if (ret < 0)
657 return 0;
658
659 ret = usbhsf_fifo_barrier(priv, fifo);
660 if (ret < 0)
661 goto usbhs_fifo_read_busy;
662
663 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
664
665 buf = pkt->buf + pkt->actual;
666 len = pkt->length - pkt->actual;
667 len = min(len, rcv_len);
668 total_len = len;
669
670 /*
671 * update actual length first here to decide disable pipe.
672 * if this pipe keeps BUF status and all data were popped,
673 * then, next interrupt/token will be issued again
674 */
675 pkt->actual += total_len;
676
677 if ((pkt->actual == pkt->length) || /* receive all data */
678 (total_len < maxp)) { /* short packet */
679 *is_done = 1;
680 usbhsf_rx_irq_ctrl(pipe, 0);
681 usbhs_pipe_running(pipe, 0);
682 /*
683 * If function mode, since this controller is possible to enter
684 * Control Write status stage at this timing, this driver
685 * should not disable the pipe. If such a case happens, this
686 * controller is not able to complete the status stage.
687 */
688 if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
689 usbhs_pipe_disable(pipe); /* disable pipe first */
690 }
691
692 /*
693 * Buffer clear if Zero-Length packet
694 *
695 * see
696 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
697 */
698 if (0 == rcv_len) {
699 pkt->zero = 1;
700 usbhsf_fifo_clear(pipe, fifo);
701 goto usbhs_fifo_read_end;
702 }
703
704 /*
705 * FIXME
706 *
707 * 32-bit access only
708 */
709 if (len >= 4 && !((unsigned long)buf & 0x03)) {
710 ioread32_rep(addr, buf, len / 4);
711 len %= 4;
712 buf += total_len - len;
713 }
714
715 /* the rest operation */
716 for (i = 0; i < len; i++) {
717 if (!(i & 0x03))
718 data = ioread32(addr);
719
720 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
721 }
722
723usbhs_fifo_read_end:
724 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
725 usbhs_pipe_number(pipe),
726 pkt->length, pkt->actual, *is_done, pkt->zero);
727
728usbhs_fifo_read_busy:
729 usbhsf_fifo_unselect(pipe, fifo);
730
731 return ret;
732}
733
734const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
735 .prepare = usbhsf_prepare_pop,
736 .try_run = usbhsf_pio_try_pop,
737};
738
739/*
740 * DCP ctrol statge handler
741 */
742static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
743{
744 usbhs_dcp_control_transfer_done(pkt->pipe);
745
746 *is_done = 1;
747
748 return 0;
749}
750
751const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
752 .prepare = usbhsf_ctrl_stage_end,
753 .try_run = usbhsf_ctrl_stage_end,
754};
755
756/*
757 * DMA fifo functions
758 */
759static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
760 struct usbhs_pkt *pkt)
761{
762 if (&usbhs_fifo_dma_push_handler == pkt->handler)
763 return fifo->tx_chan;
764
765 if (&usbhs_fifo_dma_pop_handler == pkt->handler)
766 return fifo->rx_chan;
767
768 return NULL;
769}
770
771static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
772 struct usbhs_pkt *pkt)
773{
774 struct usbhs_fifo *fifo;
775 int i;
776
777 usbhs_for_each_dfifo(priv, fifo, i) {
778 if (usbhsf_dma_chan_get(fifo, pkt) &&
779 !usbhsf_fifo_is_busy(fifo))
780 return fifo;
781 }
782
783 return NULL;
784}
785
786#define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE)
787#define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0)
788static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
789 struct usbhs_fifo *fifo,
790 u16 dreqe)
791{
792 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
793
794 usbhs_bset(priv, fifo->sel, DREQE, dreqe);
795}
796
797static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
798{
799 struct usbhs_pipe *pipe = pkt->pipe;
800 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
801 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
802
803 return info->dma_map_ctrl(pkt, map);
804}
805
806static void usbhsf_dma_complete(void *arg);
807static void xfer_work(struct work_struct *work)
808{
809 struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
810 struct usbhs_pipe *pipe = pkt->pipe;
811 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
812 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
813 struct dma_async_tx_descriptor *desc;
814 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
815 struct device *dev = usbhs_priv_to_dev(priv);
816 enum dma_transfer_direction dir;
817
818 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
819
820 desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
821 pkt->trans, dir,
822 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
823 if (!desc)
824 return;
825
826 desc->callback = usbhsf_dma_complete;
827 desc->callback_param = pipe;
828
829 pkt->cookie = dmaengine_submit(desc);
830 if (pkt->cookie < 0) {
831 dev_err(dev, "Failed to submit dma descriptor\n");
832 return;
833 }
834
835 dev_dbg(dev, " %s %d (%d/ %d)\n",
836 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
837
838 usbhs_pipe_running(pipe, 1);
839 usbhsf_dma_start(pipe, fifo);
840 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
841 dma_async_issue_pending(chan);
842 usbhs_pipe_enable(pipe);
843}
844
845/*
846 * DMA push handler
847 */
848static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
849{
850 struct usbhs_pipe *pipe = pkt->pipe;
851 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
852 struct usbhs_fifo *fifo;
853 int len = pkt->length - pkt->actual;
854 int ret;
855 uintptr_t align_mask;
856
857 if (usbhs_pipe_is_busy(pipe))
858 return 0;
859
860 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
861 if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
862 usbhs_pipe_is_dcp(pipe))
863 goto usbhsf_pio_prepare_push;
864
865 /* check data length if this driver don't use USB-DMAC */
866 if (!usbhs_get_dparam(priv, has_usb_dmac) && len & 0x7)
867 goto usbhsf_pio_prepare_push;
868
869 /* check buffer alignment */
870 align_mask = usbhs_get_dparam(priv, has_usb_dmac) ?
871 USBHS_USB_DMAC_XFER_SIZE - 1 : 0x7;
872 if ((uintptr_t)(pkt->buf + pkt->actual) & align_mask)
873 goto usbhsf_pio_prepare_push;
874
875 /* return at this time if the pipe is running */
876 if (usbhs_pipe_is_running(pipe))
877 return 0;
878
879 /* get enable DMA fifo */
880 fifo = usbhsf_get_dma_fifo(priv, pkt);
881 if (!fifo)
882 goto usbhsf_pio_prepare_push;
883
884 if (usbhsf_dma_map(pkt) < 0)
885 goto usbhsf_pio_prepare_push;
886
887 ret = usbhsf_fifo_select(pipe, fifo, 0);
888 if (ret < 0)
889 goto usbhsf_pio_prepare_push_unmap;
890
891 pkt->trans = len;
892
893 usbhsf_tx_irq_ctrl(pipe, 0);
894 INIT_WORK(&pkt->work, xfer_work);
895 schedule_work(&pkt->work);
896
897 return 0;
898
899usbhsf_pio_prepare_push_unmap:
900 usbhsf_dma_unmap(pkt);
901usbhsf_pio_prepare_push:
902 /*
903 * change handler to PIO
904 */
905 pkt->handler = &usbhs_fifo_pio_push_handler;
906
907 return pkt->handler->prepare(pkt, is_done);
908}
909
910static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
911{
912 struct usbhs_pipe *pipe = pkt->pipe;
913 int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
914
915 pkt->actual += pkt->trans;
916
917 if (pkt->actual < pkt->length)
918 *is_done = 0; /* there are remainder data */
919 else if (is_short)
920 *is_done = 1; /* short packet */
921 else
922 *is_done = !pkt->zero; /* send zero packet? */
923
924 usbhs_pipe_running(pipe, !*is_done);
925
926 usbhsf_dma_stop(pipe, pipe->fifo);
927 usbhsf_dma_unmap(pkt);
928 usbhsf_fifo_unselect(pipe, pipe->fifo);
929
930 if (!*is_done) {
931 /* change handler to PIO */
932 pkt->handler = &usbhs_fifo_pio_push_handler;
933 return pkt->handler->try_run(pkt, is_done);
934 }
935
936 return 0;
937}
938
939const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
940 .prepare = usbhsf_dma_prepare_push,
941 .dma_done = usbhsf_dma_push_done,
942};
943
944/*
945 * DMA pop handler
946 */
947
948static int usbhsf_dma_prepare_pop_with_rx_irq(struct usbhs_pkt *pkt,
949 int *is_done)
950{
951 return usbhsf_prepare_pop(pkt, is_done);
952}
953
954static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
955 int *is_done)
956{
957 struct usbhs_pipe *pipe = pkt->pipe;
958 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
959 struct usbhs_fifo *fifo;
960 int ret;
961
962 if (usbhs_pipe_is_busy(pipe))
963 return 0;
964
965 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
966 if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
967 usbhs_pipe_is_dcp(pipe))
968 goto usbhsf_pio_prepare_pop;
969
970 fifo = usbhsf_get_dma_fifo(priv, pkt);
971 if (!fifo)
972 goto usbhsf_pio_prepare_pop;
973
974 if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
975 goto usbhsf_pio_prepare_pop;
976
977 usbhs_pipe_config_change_bfre(pipe, 1);
978
979 ret = usbhsf_fifo_select(pipe, fifo, 0);
980 if (ret < 0)
981 goto usbhsf_pio_prepare_pop;
982
983 if (usbhsf_dma_map(pkt) < 0)
984 goto usbhsf_pio_prepare_pop_unselect;
985
986 /* DMA */
987
988 /*
989 * usbhs_fifo_dma_pop_handler :: prepare
990 * enabled irq to come here.
991 * but it is no longer needed for DMA. disable it.
992 */
993 usbhsf_rx_irq_ctrl(pipe, 0);
994
995 pkt->trans = pkt->length;
996
997 INIT_WORK(&pkt->work, xfer_work);
998 schedule_work(&pkt->work);
999
1000 return 0;
1001
1002usbhsf_pio_prepare_pop_unselect:
1003 usbhsf_fifo_unselect(pipe, fifo);
1004usbhsf_pio_prepare_pop:
1005
1006 /*
1007 * change handler to PIO
1008 */
1009 pkt->handler = &usbhs_fifo_pio_pop_handler;
1010 usbhs_pipe_config_change_bfre(pipe, 0);
1011
1012 return pkt->handler->prepare(pkt, is_done);
1013}
1014
1015static int usbhsf_dma_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
1016{
1017 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1018
1019 if (usbhs_get_dparam(priv, has_usb_dmac))
1020 return usbhsf_dma_prepare_pop_with_usb_dmac(pkt, is_done);
1021 else
1022 return usbhsf_dma_prepare_pop_with_rx_irq(pkt, is_done);
1023}
1024
1025static int usbhsf_dma_try_pop_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1026{
1027 struct usbhs_pipe *pipe = pkt->pipe;
1028 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1029 struct usbhs_fifo *fifo;
1030 int len, ret;
1031
1032 if (usbhs_pipe_is_busy(pipe))
1033 return 0;
1034
1035 if (usbhs_pipe_is_dcp(pipe))
1036 goto usbhsf_pio_prepare_pop;
1037
1038 /* get enable DMA fifo */
1039 fifo = usbhsf_get_dma_fifo(priv, pkt);
1040 if (!fifo)
1041 goto usbhsf_pio_prepare_pop;
1042
1043 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
1044 goto usbhsf_pio_prepare_pop;
1045
1046 ret = usbhsf_fifo_select(pipe, fifo, 0);
1047 if (ret < 0)
1048 goto usbhsf_pio_prepare_pop;
1049
1050 /* use PIO if packet is less than pio_dma_border */
1051 len = usbhsf_fifo_rcv_len(priv, fifo);
1052 len = min(pkt->length - pkt->actual, len);
1053 if (len & 0x7) /* 8byte alignment */
1054 goto usbhsf_pio_prepare_pop_unselect;
1055
1056 if (len < usbhs_get_dparam(priv, pio_dma_border))
1057 goto usbhsf_pio_prepare_pop_unselect;
1058
1059 ret = usbhsf_fifo_barrier(priv, fifo);
1060 if (ret < 0)
1061 goto usbhsf_pio_prepare_pop_unselect;
1062
1063 if (usbhsf_dma_map(pkt) < 0)
1064 goto usbhsf_pio_prepare_pop_unselect;
1065
1066 /* DMA */
1067
1068 /*
1069 * usbhs_fifo_dma_pop_handler :: prepare
1070 * enabled irq to come here.
1071 * but it is no longer needed for DMA. disable it.
1072 */
1073 usbhsf_rx_irq_ctrl(pipe, 0);
1074
1075 pkt->trans = len;
1076
1077 INIT_WORK(&pkt->work, xfer_work);
1078 schedule_work(&pkt->work);
1079
1080 return 0;
1081
1082usbhsf_pio_prepare_pop_unselect:
1083 usbhsf_fifo_unselect(pipe, fifo);
1084usbhsf_pio_prepare_pop:
1085
1086 /*
1087 * change handler to PIO
1088 */
1089 pkt->handler = &usbhs_fifo_pio_pop_handler;
1090
1091 return pkt->handler->try_run(pkt, is_done);
1092}
1093
1094static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
1095{
1096 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1097
1098 BUG_ON(usbhs_get_dparam(priv, has_usb_dmac));
1099
1100 return usbhsf_dma_try_pop_with_rx_irq(pkt, is_done);
1101}
1102
1103static int usbhsf_dma_pop_done_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1104{
1105 struct usbhs_pipe *pipe = pkt->pipe;
1106 int maxp = usbhs_pipe_get_maxpacket(pipe);
1107
1108 usbhsf_dma_stop(pipe, pipe->fifo);
1109 usbhsf_dma_unmap(pkt);
1110 usbhsf_fifo_unselect(pipe, pipe->fifo);
1111
1112 pkt->actual += pkt->trans;
1113
1114 if ((pkt->actual == pkt->length) || /* receive all data */
1115 (pkt->trans < maxp)) { /* short packet */
1116 *is_done = 1;
1117 usbhs_pipe_running(pipe, 0);
1118 } else {
1119 /* re-enable */
1120 usbhs_pipe_running(pipe, 0);
1121 usbhsf_prepare_pop(pkt, is_done);
1122 }
1123
1124 return 0;
1125}
1126
1127static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
1128 struct dma_chan *chan, int dtln)
1129{
1130 struct usbhs_pipe *pipe = pkt->pipe;
1131 struct dma_tx_state state;
1132 size_t received_size;
1133 int maxp = usbhs_pipe_get_maxpacket(pipe);
1134
1135 dmaengine_tx_status(chan, pkt->cookie, &state);
1136 received_size = pkt->length - state.residue;
1137
1138 if (dtln) {
1139 received_size -= USBHS_USB_DMAC_XFER_SIZE;
1140 received_size &= ~(maxp - 1);
1141 received_size += dtln;
1142 }
1143
1144 return received_size;
1145}
1146
1147static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
1148 int *is_done)
1149{
1150 struct usbhs_pipe *pipe = pkt->pipe;
1151 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1152 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
1153 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
1154 int rcv_len;
1155
1156 /*
1157 * Since the driver disables rx_irq in DMA mode, the interrupt handler
1158 * cannot the BRDYSTS. So, the function clears it here because the
1159 * driver may use PIO mode next time.
1160 */
1161 usbhs_xxxsts_clear(priv, BRDYSTS, usbhs_pipe_number(pipe));
1162
1163 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
1164 usbhsf_fifo_clear(pipe, fifo);
1165 pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
1166
1167 usbhsf_dma_stop(pipe, fifo);
1168 usbhsf_dma_unmap(pkt);
1169 usbhsf_fifo_unselect(pipe, pipe->fifo);
1170
1171 /* The driver can assume the rx transaction is always "done" */
1172 *is_done = 1;
1173
1174 return 0;
1175}
1176
1177static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
1178{
1179 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1180
1181 if (usbhs_get_dparam(priv, has_usb_dmac))
1182 return usbhsf_dma_pop_done_with_usb_dmac(pkt, is_done);
1183 else
1184 return usbhsf_dma_pop_done_with_rx_irq(pkt, is_done);
1185}
1186
1187const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
1188 .prepare = usbhsf_dma_prepare_pop,
1189 .try_run = usbhsf_dma_try_pop,
1190 .dma_done = usbhsf_dma_pop_done
1191};
1192
1193/*
1194 * DMA setting
1195 */
1196static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
1197{
1198 struct sh_dmae_slave *slave = param;
1199
1200 /*
1201 * FIXME
1202 *
1203 * usbhs doesn't recognize id = 0 as valid DMA
1204 */
1205 if (0 == slave->shdma_slave.slave_id)
1206 return false;
1207
1208 chan->private = slave;
1209
1210 return true;
1211}
1212
1213static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1214{
1215 if (fifo->tx_chan)
1216 dma_release_channel(fifo->tx_chan);
1217 if (fifo->rx_chan)
1218 dma_release_channel(fifo->rx_chan);
1219
1220 fifo->tx_chan = NULL;
1221 fifo->rx_chan = NULL;
1222}
1223
1224static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
1225{
1226 dma_cap_mask_t mask;
1227
1228 dma_cap_zero(mask);
1229 dma_cap_set(DMA_SLAVE, mask);
1230 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1231 &fifo->tx_slave);
1232
1233 dma_cap_zero(mask);
1234 dma_cap_set(DMA_SLAVE, mask);
1235 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1236 &fifo->rx_slave);
1237}
1238
1239static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
1240 int channel)
1241{
1242 char name[16];
1243
1244 /*
1245 * To avoid complex handing for DnFIFOs, the driver uses each
1246 * DnFIFO as TX or RX direction (not bi-direction).
1247 * So, the driver uses odd channels for TX, even channels for RX.
1248 */
1249 snprintf(name, sizeof(name), "ch%d", channel);
1250 if (channel & 1) {
1251 fifo->tx_chan = dma_request_slave_channel_reason(dev, name);
1252 if (IS_ERR(fifo->tx_chan))
1253 fifo->tx_chan = NULL;
1254 } else {
1255 fifo->rx_chan = dma_request_slave_channel_reason(dev, name);
1256 if (IS_ERR(fifo->rx_chan))
1257 fifo->rx_chan = NULL;
1258 }
1259}
1260
1261static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
1262 int channel)
1263{
1264 struct device *dev = usbhs_priv_to_dev(priv);
1265
1266 if (dev->of_node)
1267 usbhsf_dma_init_dt(dev, fifo, channel);
1268 else
1269 usbhsf_dma_init_pdev(fifo);
1270
1271 if (fifo->tx_chan || fifo->rx_chan)
1272 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1273 fifo->name,
1274 fifo->tx_chan ? "[TX]" : " ",
1275 fifo->rx_chan ? "[RX]" : " ");
1276}
1277
1278/*
1279 * irq functions
1280 */
1281static int usbhsf_irq_empty(struct usbhs_priv *priv,
1282 struct usbhs_irq_state *irq_state)
1283{
1284 struct usbhs_pipe *pipe;
1285 struct device *dev = usbhs_priv_to_dev(priv);
1286 int i, ret;
1287
1288 if (!irq_state->bempsts) {
1289 dev_err(dev, "debug %s !!\n", __func__);
1290 return -EIO;
1291 }
1292
1293 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1294
1295 /*
1296 * search interrupted "pipe"
1297 * not "uep".
1298 */
1299 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1300 if (!(irq_state->bempsts & (1 << i)))
1301 continue;
1302
1303 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1304 if (ret < 0)
1305 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1306 }
1307
1308 return 0;
1309}
1310
1311static int usbhsf_irq_ready(struct usbhs_priv *priv,
1312 struct usbhs_irq_state *irq_state)
1313{
1314 struct usbhs_pipe *pipe;
1315 struct device *dev = usbhs_priv_to_dev(priv);
1316 int i, ret;
1317
1318 if (!irq_state->brdysts) {
1319 dev_err(dev, "debug %s !!\n", __func__);
1320 return -EIO;
1321 }
1322
1323 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1324
1325 /*
1326 * search interrupted "pipe"
1327 * not "uep".
1328 */
1329 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1330 if (!(irq_state->brdysts & (1 << i)))
1331 continue;
1332
1333 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1334 if (ret < 0)
1335 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1336 }
1337
1338 return 0;
1339}
1340
1341static void usbhsf_dma_complete(void *arg)
1342{
1343 struct usbhs_pipe *pipe = arg;
1344 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1345 struct device *dev = usbhs_priv_to_dev(priv);
1346 int ret;
1347
1348 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1349 if (ret < 0)
1350 dev_err(dev, "dma_complete run_error %d : %d\n",
1351 usbhs_pipe_number(pipe), ret);
1352}
1353
1354void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe)
1355{
1356 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1357 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
1358
1359 /* clear DCP FIFO of transmission */
1360 if (usbhsf_fifo_select(pipe, fifo, 1) < 0)
1361 return;
1362 usbhsf_fifo_clear(pipe, fifo);
1363 usbhsf_fifo_unselect(pipe, fifo);
1364
1365 /* clear DCP FIFO of reception */
1366 if (usbhsf_fifo_select(pipe, fifo, 0) < 0)
1367 return;
1368 usbhsf_fifo_clear(pipe, fifo);
1369 usbhsf_fifo_unselect(pipe, fifo);
1370}
1371
1372/*
1373 * fifo init
1374 */
1375void usbhs_fifo_init(struct usbhs_priv *priv)
1376{
1377 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1378 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1379 struct usbhs_fifo *dfifo;
1380 int i;
1381
1382 mod->irq_empty = usbhsf_irq_empty;
1383 mod->irq_ready = usbhsf_irq_ready;
1384 mod->irq_bempsts = 0;
1385 mod->irq_brdysts = 0;
1386
1387 cfifo->pipe = NULL;
1388 usbhs_for_each_dfifo(priv, dfifo, i)
1389 dfifo->pipe = NULL;
1390}
1391
1392void usbhs_fifo_quit(struct usbhs_priv *priv)
1393{
1394 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1395
1396 mod->irq_empty = NULL;
1397 mod->irq_ready = NULL;
1398 mod->irq_bempsts = 0;
1399 mod->irq_brdysts = 0;
1400}
1401
1402#define __USBHS_DFIFO_INIT(priv, fifo, channel, fifo_port) \
1403do { \
1404 fifo = usbhsf_get_dnfifo(priv, channel); \
1405 fifo->name = "D"#channel"FIFO"; \
1406 fifo->port = fifo_port; \
1407 fifo->sel = D##channel##FIFOSEL; \
1408 fifo->ctr = D##channel##FIFOCTR; \
1409 fifo->tx_slave.shdma_slave.slave_id = \
1410 usbhs_get_dparam(priv, d##channel##_tx_id); \
1411 fifo->rx_slave.shdma_slave.slave_id = \
1412 usbhs_get_dparam(priv, d##channel##_rx_id); \
1413 usbhsf_dma_init(priv, fifo, channel); \
1414} while (0)
1415
1416#define USBHS_DFIFO_INIT(priv, fifo, channel) \
1417 __USBHS_DFIFO_INIT(priv, fifo, channel, D##channel##FIFO)
1418#define USBHS_DFIFO_INIT_NO_PORT(priv, fifo, channel) \
1419 __USBHS_DFIFO_INIT(priv, fifo, channel, 0)
1420
1421int usbhs_fifo_probe(struct usbhs_priv *priv)
1422{
1423 struct usbhs_fifo *fifo;
1424
1425 /* CFIFO */
1426 fifo = usbhsf_get_cfifo(priv);
1427 fifo->name = "CFIFO";
1428 fifo->port = CFIFO;
1429 fifo->sel = CFIFOSEL;
1430 fifo->ctr = CFIFOCTR;
1431
1432 /* DFIFO */
1433 USBHS_DFIFO_INIT(priv, fifo, 0);
1434 USBHS_DFIFO_INIT(priv, fifo, 1);
1435 USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 2);
1436 USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 3);
1437
1438 return 0;
1439}
1440
1441void usbhs_fifo_remove(struct usbhs_priv *priv)
1442{
1443 struct usbhs_fifo *fifo;
1444 int i;
1445
1446 usbhs_for_each_dfifo(priv, fifo, i)
1447 usbhsf_dma_quit(priv, fifo);
1448}
1/*
2 * Renesas USB driver
3 *
4 * Copyright (C) 2011 Renesas Solutions Corp.
5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
15 *
16 */
17#include <linux/delay.h>
18#include <linux/io.h>
19#include <linux/scatterlist.h>
20#include "./common.h"
21#include "./pipe.h"
22
23#define usbhsf_get_cfifo(p) (&((p)->fifo_info.cfifo))
24#define usbhsf_get_d0fifo(p) (&((p)->fifo_info.d0fifo))
25#define usbhsf_get_d1fifo(p) (&((p)->fifo_info.d1fifo))
26#define usbhsf_is_cfifo(p, f) (usbhsf_get_cfifo(p) == f)
27
28#define usbhsf_fifo_is_busy(f) ((f)->pipe) /* see usbhs_pipe_select_fifo */
29
30/*
31 * packet initialize
32 */
33void usbhs_pkt_init(struct usbhs_pkt *pkt)
34{
35 pkt->dma = DMA_ADDR_INVALID;
36 INIT_LIST_HEAD(&pkt->node);
37}
38
39/*
40 * packet control function
41 */
42static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
43{
44 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
45 struct device *dev = usbhs_priv_to_dev(priv);
46
47 dev_err(dev, "null handler\n");
48
49 return -EINVAL;
50}
51
52static struct usbhs_pkt_handle usbhsf_null_handler = {
53 .prepare = usbhsf_null_handle,
54 .try_run = usbhsf_null_handle,
55};
56
57void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
58 void (*done)(struct usbhs_priv *priv,
59 struct usbhs_pkt *pkt),
60 void *buf, int len, int zero, int sequence)
61{
62 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
63 struct device *dev = usbhs_priv_to_dev(priv);
64 unsigned long flags;
65
66 if (!done) {
67 dev_err(dev, "no done function\n");
68 return;
69 }
70
71 /******************** spin lock ********************/
72 usbhs_lock(priv, flags);
73
74 if (!pipe->handler) {
75 dev_err(dev, "no handler function\n");
76 pipe->handler = &usbhsf_null_handler;
77 }
78
79 list_move_tail(&pkt->node, &pipe->list);
80
81 /*
82 * each pkt must hold own handler.
83 * because handler might be changed by its situation.
84 * dma handler -> pio handler.
85 */
86 pkt->pipe = pipe;
87 pkt->buf = buf;
88 pkt->handler = pipe->handler;
89 pkt->length = len;
90 pkt->zero = zero;
91 pkt->actual = 0;
92 pkt->done = done;
93 pkt->sequence = sequence;
94
95 usbhs_unlock(priv, flags);
96 /******************** spin unlock ******************/
97}
98
99static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
100{
101 list_del_init(&pkt->node);
102}
103
104static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
105{
106 if (list_empty(&pipe->list))
107 return NULL;
108
109 return list_first_entry(&pipe->list, struct usbhs_pkt, node);
110}
111
112struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
113{
114 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
115 unsigned long flags;
116
117 /******************** spin lock ********************/
118 usbhs_lock(priv, flags);
119
120 if (!pkt)
121 pkt = __usbhsf_pkt_get(pipe);
122
123 if (pkt)
124 __usbhsf_pkt_del(pkt);
125
126 usbhs_unlock(priv, flags);
127 /******************** spin unlock ******************/
128
129 return pkt;
130}
131
132enum {
133 USBHSF_PKT_PREPARE,
134 USBHSF_PKT_TRY_RUN,
135 USBHSF_PKT_DMA_DONE,
136};
137
138static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
139{
140 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
141 struct usbhs_pkt *pkt;
142 struct device *dev = usbhs_priv_to_dev(priv);
143 int (*func)(struct usbhs_pkt *pkt, int *is_done);
144 unsigned long flags;
145 int ret = 0;
146 int is_done = 0;
147
148 /******************** spin lock ********************/
149 usbhs_lock(priv, flags);
150
151 pkt = __usbhsf_pkt_get(pipe);
152 if (!pkt)
153 goto __usbhs_pkt_handler_end;
154
155 switch (type) {
156 case USBHSF_PKT_PREPARE:
157 func = pkt->handler->prepare;
158 break;
159 case USBHSF_PKT_TRY_RUN:
160 func = pkt->handler->try_run;
161 break;
162 case USBHSF_PKT_DMA_DONE:
163 func = pkt->handler->dma_done;
164 break;
165 default:
166 dev_err(dev, "unknown pkt hander\n");
167 goto __usbhs_pkt_handler_end;
168 }
169
170 ret = func(pkt, &is_done);
171
172 if (is_done)
173 __usbhsf_pkt_del(pkt);
174
175__usbhs_pkt_handler_end:
176 usbhs_unlock(priv, flags);
177 /******************** spin unlock ******************/
178
179 if (is_done) {
180 pkt->done(priv, pkt);
181 usbhs_pkt_start(pipe);
182 }
183
184 return ret;
185}
186
187void usbhs_pkt_start(struct usbhs_pipe *pipe)
188{
189 usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
190}
191
192/*
193 * irq enable/disable function
194 */
195#define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, bempsts, e)
196#define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, brdysts, e)
197#define usbhsf_irq_callback_ctrl(pipe, status, enable) \
198 ({ \
199 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); \
200 struct usbhs_mod *mod = usbhs_mod_get_current(priv); \
201 u16 status = (1 << usbhs_pipe_number(pipe)); \
202 if (!mod) \
203 return; \
204 if (enable) \
205 mod->irq_##status |= status; \
206 else \
207 mod->irq_##status &= ~status; \
208 usbhs_irq_callback_update(priv, mod); \
209 })
210
211static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
212{
213 /*
214 * And DCP pipe can NOT use "ready interrupt" for "send"
215 * it should use "empty" interrupt.
216 * see
217 * "Operation" - "Interrupt Function" - "BRDY Interrupt"
218 *
219 * on the other hand, normal pipe can use "ready interrupt" for "send"
220 * even though it is single/double buffer
221 */
222 if (usbhs_pipe_is_dcp(pipe))
223 usbhsf_irq_empty_ctrl(pipe, enable);
224 else
225 usbhsf_irq_ready_ctrl(pipe, enable);
226}
227
228static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
229{
230 usbhsf_irq_ready_ctrl(pipe, enable);
231}
232
233/*
234 * FIFO ctrl
235 */
236static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
237 struct usbhs_fifo *fifo)
238{
239 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
240
241 usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
242}
243
244static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
245 struct usbhs_fifo *fifo)
246{
247 int timeout = 1024;
248
249 do {
250 /* The FIFO port is accessible */
251 if (usbhs_read(priv, fifo->ctr) & FRDY)
252 return 0;
253
254 udelay(10);
255 } while (timeout--);
256
257 return -EBUSY;
258}
259
260static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
261 struct usbhs_fifo *fifo)
262{
263 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
264
265 if (!usbhs_pipe_is_dcp(pipe))
266 usbhsf_fifo_barrier(priv, fifo);
267
268 usbhs_write(priv, fifo->ctr, BCLR);
269}
270
271static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
272 struct usbhs_fifo *fifo)
273{
274 return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
275}
276
277static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
278 struct usbhs_fifo *fifo)
279{
280 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
281
282 usbhs_pipe_select_fifo(pipe, NULL);
283 usbhs_write(priv, fifo->sel, 0);
284}
285
286static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
287 struct usbhs_fifo *fifo,
288 int write)
289{
290 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
291 struct device *dev = usbhs_priv_to_dev(priv);
292 int timeout = 1024;
293 u16 mask = ((1 << 5) | 0xF); /* mask of ISEL | CURPIPE */
294 u16 base = usbhs_pipe_number(pipe); /* CURPIPE */
295
296 if (usbhs_pipe_is_busy(pipe) ||
297 usbhsf_fifo_is_busy(fifo))
298 return -EBUSY;
299
300 if (usbhs_pipe_is_dcp(pipe)) {
301 base |= (1 == write) << 5; /* ISEL */
302
303 if (usbhs_mod_is_host(priv))
304 usbhs_dcp_dir_for_host(pipe, write);
305 }
306
307 /* "base" will be used below */
308 if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo))
309 usbhs_write(priv, fifo->sel, base);
310 else
311 usbhs_write(priv, fifo->sel, base | MBW_32);
312
313 /* check ISEL and CURPIPE value */
314 while (timeout--) {
315 if (base == (mask & usbhs_read(priv, fifo->sel))) {
316 usbhs_pipe_select_fifo(pipe, fifo);
317 return 0;
318 }
319 udelay(10);
320 }
321
322 dev_err(dev, "fifo select error\n");
323
324 return -EIO;
325}
326
327/*
328 * DCP status stage
329 */
330static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
331{
332 struct usbhs_pipe *pipe = pkt->pipe;
333 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
334 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
335 struct device *dev = usbhs_priv_to_dev(priv);
336 int ret;
337
338 usbhs_pipe_disable(pipe);
339
340 ret = usbhsf_fifo_select(pipe, fifo, 1);
341 if (ret < 0) {
342 dev_err(dev, "%s() faile\n", __func__);
343 return ret;
344 }
345
346 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
347
348 usbhsf_fifo_clear(pipe, fifo);
349 usbhsf_send_terminator(pipe, fifo);
350
351 usbhsf_fifo_unselect(pipe, fifo);
352
353 usbhsf_tx_irq_ctrl(pipe, 1);
354 usbhs_pipe_enable(pipe);
355
356 return ret;
357}
358
359static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
360{
361 struct usbhs_pipe *pipe = pkt->pipe;
362 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
363 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
364 struct device *dev = usbhs_priv_to_dev(priv);
365 int ret;
366
367 usbhs_pipe_disable(pipe);
368
369 ret = usbhsf_fifo_select(pipe, fifo, 0);
370 if (ret < 0) {
371 dev_err(dev, "%s() fail\n", __func__);
372 return ret;
373 }
374
375 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
376 usbhsf_fifo_clear(pipe, fifo);
377
378 usbhsf_fifo_unselect(pipe, fifo);
379
380 usbhsf_rx_irq_ctrl(pipe, 1);
381 usbhs_pipe_enable(pipe);
382
383 return ret;
384
385}
386
387static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
388{
389 struct usbhs_pipe *pipe = pkt->pipe;
390
391 if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
392 usbhsf_tx_irq_ctrl(pipe, 0);
393 else
394 usbhsf_rx_irq_ctrl(pipe, 0);
395
396 pkt->actual = pkt->length;
397 *is_done = 1;
398
399 return 0;
400}
401
402struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
403 .prepare = usbhs_dcp_dir_switch_to_write,
404 .try_run = usbhs_dcp_dir_switch_done,
405};
406
407struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
408 .prepare = usbhs_dcp_dir_switch_to_read,
409 .try_run = usbhs_dcp_dir_switch_done,
410};
411
412/*
413 * DCP data stage (push)
414 */
415static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
416{
417 struct usbhs_pipe *pipe = pkt->pipe;
418
419 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
420
421 /*
422 * change handler to PIO push
423 */
424 pkt->handler = &usbhs_fifo_pio_push_handler;
425
426 return pkt->handler->prepare(pkt, is_done);
427}
428
429struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
430 .prepare = usbhsf_dcp_data_stage_try_push,
431};
432
433/*
434 * DCP data stage (pop)
435 */
436static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
437 int *is_done)
438{
439 struct usbhs_pipe *pipe = pkt->pipe;
440 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
441 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
442
443 if (usbhs_pipe_is_busy(pipe))
444 return 0;
445
446 /*
447 * prepare pop for DCP should
448 * - change DCP direction,
449 * - clear fifo
450 * - DATA1
451 */
452 usbhs_pipe_disable(pipe);
453
454 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
455
456 usbhsf_fifo_select(pipe, fifo, 0);
457 usbhsf_fifo_clear(pipe, fifo);
458 usbhsf_fifo_unselect(pipe, fifo);
459
460 /*
461 * change handler to PIO pop
462 */
463 pkt->handler = &usbhs_fifo_pio_pop_handler;
464
465 return pkt->handler->prepare(pkt, is_done);
466}
467
468struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
469 .prepare = usbhsf_dcp_data_stage_prepare_pop,
470};
471
472/*
473 * PIO push handler
474 */
475static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
476{
477 struct usbhs_pipe *pipe = pkt->pipe;
478 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
479 struct device *dev = usbhs_priv_to_dev(priv);
480 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
481 void __iomem *addr = priv->base + fifo->port;
482 u8 *buf;
483 int maxp = usbhs_pipe_get_maxpacket(pipe);
484 int total_len;
485 int i, ret, len;
486 int is_short;
487
488 usbhs_pipe_data_sequence(pipe, pkt->sequence);
489 pkt->sequence = -1; /* -1 sequence will be ignored */
490
491 ret = usbhsf_fifo_select(pipe, fifo, 1);
492 if (ret < 0)
493 return 0;
494
495 ret = usbhs_pipe_is_accessible(pipe);
496 if (ret < 0) {
497 /* inaccessible pipe is not an error */
498 ret = 0;
499 goto usbhs_fifo_write_busy;
500 }
501
502 ret = usbhsf_fifo_barrier(priv, fifo);
503 if (ret < 0)
504 goto usbhs_fifo_write_busy;
505
506 buf = pkt->buf + pkt->actual;
507 len = pkt->length - pkt->actual;
508 len = min(len, maxp);
509 total_len = len;
510 is_short = total_len < maxp;
511
512 /*
513 * FIXME
514 *
515 * 32-bit access only
516 */
517 if (len >= 4 && !((unsigned long)buf & 0x03)) {
518 iowrite32_rep(addr, buf, len / 4);
519 len %= 4;
520 buf += total_len - len;
521 }
522
523 /* the rest operation */
524 for (i = 0; i < len; i++)
525 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
526
527 /*
528 * variable update
529 */
530 pkt->actual += total_len;
531
532 if (pkt->actual < pkt->length)
533 *is_done = 0; /* there are remainder data */
534 else if (is_short)
535 *is_done = 1; /* short packet */
536 else
537 *is_done = !pkt->zero; /* send zero packet ? */
538
539 /*
540 * pipe/irq handling
541 */
542 if (is_short)
543 usbhsf_send_terminator(pipe, fifo);
544
545 usbhsf_tx_irq_ctrl(pipe, !*is_done);
546 usbhs_pipe_enable(pipe);
547
548 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
549 usbhs_pipe_number(pipe),
550 pkt->length, pkt->actual, *is_done, pkt->zero);
551
552 /*
553 * Transmission end
554 */
555 if (*is_done) {
556 if (usbhs_pipe_is_dcp(pipe))
557 usbhs_dcp_control_transfer_done(pipe);
558 }
559
560 usbhsf_fifo_unselect(pipe, fifo);
561
562 return 0;
563
564usbhs_fifo_write_busy:
565 usbhsf_fifo_unselect(pipe, fifo);
566
567 /*
568 * pipe is busy.
569 * retry in interrupt
570 */
571 usbhsf_tx_irq_ctrl(pipe, 1);
572
573 return ret;
574}
575
576struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
577 .prepare = usbhsf_pio_try_push,
578 .try_run = usbhsf_pio_try_push,
579};
580
581/*
582 * PIO pop handler
583 */
584static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
585{
586 struct usbhs_pipe *pipe = pkt->pipe;
587
588 if (usbhs_pipe_is_busy(pipe))
589 return 0;
590
591 /*
592 * pipe enable to prepare packet receive
593 */
594 usbhs_pipe_data_sequence(pipe, pkt->sequence);
595 pkt->sequence = -1; /* -1 sequence will be ignored */
596
597 usbhs_pipe_enable(pipe);
598 usbhsf_rx_irq_ctrl(pipe, 1);
599
600 return 0;
601}
602
603static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
604{
605 struct usbhs_pipe *pipe = pkt->pipe;
606 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
607 struct device *dev = usbhs_priv_to_dev(priv);
608 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
609 void __iomem *addr = priv->base + fifo->port;
610 u8 *buf;
611 u32 data = 0;
612 int maxp = usbhs_pipe_get_maxpacket(pipe);
613 int rcv_len, len;
614 int i, ret;
615 int total_len = 0;
616
617 ret = usbhsf_fifo_select(pipe, fifo, 0);
618 if (ret < 0)
619 return 0;
620
621 ret = usbhsf_fifo_barrier(priv, fifo);
622 if (ret < 0)
623 goto usbhs_fifo_read_busy;
624
625 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
626
627 buf = pkt->buf + pkt->actual;
628 len = pkt->length - pkt->actual;
629 len = min(len, rcv_len);
630 total_len = len;
631
632 /*
633 * update actual length first here to decide disable pipe.
634 * if this pipe keeps BUF status and all data were popped,
635 * then, next interrupt/token will be issued again
636 */
637 pkt->actual += total_len;
638
639 if ((pkt->actual == pkt->length) || /* receive all data */
640 (total_len < maxp)) { /* short packet */
641 *is_done = 1;
642 usbhsf_rx_irq_ctrl(pipe, 0);
643 usbhs_pipe_disable(pipe); /* disable pipe first */
644 }
645
646 /*
647 * Buffer clear if Zero-Length packet
648 *
649 * see
650 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
651 */
652 if (0 == rcv_len) {
653 pkt->zero = 1;
654 usbhsf_fifo_clear(pipe, fifo);
655 goto usbhs_fifo_read_end;
656 }
657
658 /*
659 * FIXME
660 *
661 * 32-bit access only
662 */
663 if (len >= 4 && !((unsigned long)buf & 0x03)) {
664 ioread32_rep(addr, buf, len / 4);
665 len %= 4;
666 buf += total_len - len;
667 }
668
669 /* the rest operation */
670 for (i = 0; i < len; i++) {
671 if (!(i & 0x03))
672 data = ioread32(addr);
673
674 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
675 }
676
677usbhs_fifo_read_end:
678 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
679 usbhs_pipe_number(pipe),
680 pkt->length, pkt->actual, *is_done, pkt->zero);
681
682usbhs_fifo_read_busy:
683 usbhsf_fifo_unselect(pipe, fifo);
684
685 return ret;
686}
687
688struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
689 .prepare = usbhsf_prepare_pop,
690 .try_run = usbhsf_pio_try_pop,
691};
692
693/*
694 * DCP ctrol statge handler
695 */
696static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
697{
698 usbhs_dcp_control_transfer_done(pkt->pipe);
699
700 *is_done = 1;
701
702 return 0;
703}
704
705struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
706 .prepare = usbhsf_ctrl_stage_end,
707 .try_run = usbhsf_ctrl_stage_end,
708};
709
710/*
711 * DMA fifo functions
712 */
713static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
714 struct usbhs_pkt *pkt)
715{
716 if (&usbhs_fifo_dma_push_handler == pkt->handler)
717 return fifo->tx_chan;
718
719 if (&usbhs_fifo_dma_pop_handler == pkt->handler)
720 return fifo->rx_chan;
721
722 return NULL;
723}
724
725static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
726 struct usbhs_pkt *pkt)
727{
728 struct usbhs_fifo *fifo;
729
730 /* DMA :: D0FIFO */
731 fifo = usbhsf_get_d0fifo(priv);
732 if (usbhsf_dma_chan_get(fifo, pkt) &&
733 !usbhsf_fifo_is_busy(fifo))
734 return fifo;
735
736 /* DMA :: D1FIFO */
737 fifo = usbhsf_get_d1fifo(priv);
738 if (usbhsf_dma_chan_get(fifo, pkt) &&
739 !usbhsf_fifo_is_busy(fifo))
740 return fifo;
741
742 return NULL;
743}
744
745#define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE)
746#define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0)
747static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
748 struct usbhs_fifo *fifo,
749 u16 dreqe)
750{
751 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
752
753 usbhs_bset(priv, fifo->sel, DREQE, dreqe);
754}
755
756#define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1)
757#define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
758static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
759{
760 struct usbhs_pipe *pipe = pkt->pipe;
761 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
762 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
763
764 return info->dma_map_ctrl(pkt, map);
765}
766
767static void usbhsf_dma_complete(void *arg);
768static void xfer_work(struct work_struct *work)
769{
770 struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
771 struct usbhs_pipe *pipe = pkt->pipe;
772 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
773 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
774 struct scatterlist sg;
775 struct dma_async_tx_descriptor *desc;
776 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
777 struct device *dev = usbhs_priv_to_dev(priv);
778 enum dma_transfer_direction dir;
779 dma_cookie_t cookie;
780
781 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
782
783 sg_init_table(&sg, 1);
784 sg_set_page(&sg, virt_to_page(pkt->dma),
785 pkt->length, offset_in_page(pkt->dma));
786 sg_dma_address(&sg) = pkt->dma + pkt->actual;
787 sg_dma_len(&sg) = pkt->trans;
788
789 desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir,
790 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
791 if (!desc)
792 return;
793
794 desc->callback = usbhsf_dma_complete;
795 desc->callback_param = pipe;
796
797 cookie = desc->tx_submit(desc);
798 if (cookie < 0) {
799 dev_err(dev, "Failed to submit dma descriptor\n");
800 return;
801 }
802
803 dev_dbg(dev, " %s %d (%d/ %d)\n",
804 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
805
806 usbhsf_dma_start(pipe, fifo);
807 dma_async_issue_pending(chan);
808}
809
810/*
811 * DMA push handler
812 */
813static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
814{
815 struct usbhs_pipe *pipe = pkt->pipe;
816 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
817 struct usbhs_fifo *fifo;
818 int len = pkt->length - pkt->actual;
819 int ret;
820
821 if (usbhs_pipe_is_busy(pipe))
822 return 0;
823
824 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
825 if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
826 usbhs_pipe_is_dcp(pipe))
827 goto usbhsf_pio_prepare_push;
828
829 if (len % 4) /* 32bit alignment */
830 goto usbhsf_pio_prepare_push;
831
832 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
833 goto usbhsf_pio_prepare_push;
834
835 /* get enable DMA fifo */
836 fifo = usbhsf_get_dma_fifo(priv, pkt);
837 if (!fifo)
838 goto usbhsf_pio_prepare_push;
839
840 if (usbhsf_dma_map(pkt) < 0)
841 goto usbhsf_pio_prepare_push;
842
843 ret = usbhsf_fifo_select(pipe, fifo, 0);
844 if (ret < 0)
845 goto usbhsf_pio_prepare_push_unmap;
846
847 pkt->trans = len;
848
849 INIT_WORK(&pkt->work, xfer_work);
850 schedule_work(&pkt->work);
851
852 return 0;
853
854usbhsf_pio_prepare_push_unmap:
855 usbhsf_dma_unmap(pkt);
856usbhsf_pio_prepare_push:
857 /*
858 * change handler to PIO
859 */
860 pkt->handler = &usbhs_fifo_pio_push_handler;
861
862 return pkt->handler->prepare(pkt, is_done);
863}
864
865static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
866{
867 struct usbhs_pipe *pipe = pkt->pipe;
868
869 pkt->actual = pkt->trans;
870
871 *is_done = !pkt->zero; /* send zero packet ? */
872
873 usbhsf_dma_stop(pipe, pipe->fifo);
874 usbhsf_dma_unmap(pkt);
875 usbhsf_fifo_unselect(pipe, pipe->fifo);
876
877 return 0;
878}
879
880struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
881 .prepare = usbhsf_dma_prepare_push,
882 .dma_done = usbhsf_dma_push_done,
883};
884
885/*
886 * DMA pop handler
887 */
888static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
889{
890 struct usbhs_pipe *pipe = pkt->pipe;
891 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
892 struct usbhs_fifo *fifo;
893 int len, ret;
894
895 if (usbhs_pipe_is_busy(pipe))
896 return 0;
897
898 if (usbhs_pipe_is_dcp(pipe))
899 goto usbhsf_pio_prepare_pop;
900
901 /* get enable DMA fifo */
902 fifo = usbhsf_get_dma_fifo(priv, pkt);
903 if (!fifo)
904 goto usbhsf_pio_prepare_pop;
905
906 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
907 goto usbhsf_pio_prepare_pop;
908
909 ret = usbhsf_fifo_select(pipe, fifo, 0);
910 if (ret < 0)
911 goto usbhsf_pio_prepare_pop;
912
913 /* use PIO if packet is less than pio_dma_border */
914 len = usbhsf_fifo_rcv_len(priv, fifo);
915 len = min(pkt->length - pkt->actual, len);
916 if (len % 4) /* 32bit alignment */
917 goto usbhsf_pio_prepare_pop_unselect;
918
919 if (len < usbhs_get_dparam(priv, pio_dma_border))
920 goto usbhsf_pio_prepare_pop_unselect;
921
922 ret = usbhsf_fifo_barrier(priv, fifo);
923 if (ret < 0)
924 goto usbhsf_pio_prepare_pop_unselect;
925
926 if (usbhsf_dma_map(pkt) < 0)
927 goto usbhsf_pio_prepare_pop_unselect;
928
929 /* DMA */
930
931 /*
932 * usbhs_fifo_dma_pop_handler :: prepare
933 * enabled irq to come here.
934 * but it is no longer needed for DMA. disable it.
935 */
936 usbhsf_rx_irq_ctrl(pipe, 0);
937
938 pkt->trans = len;
939
940 INIT_WORK(&pkt->work, xfer_work);
941 schedule_work(&pkt->work);
942
943 return 0;
944
945usbhsf_pio_prepare_pop_unselect:
946 usbhsf_fifo_unselect(pipe, fifo);
947usbhsf_pio_prepare_pop:
948
949 /*
950 * change handler to PIO
951 */
952 pkt->handler = &usbhs_fifo_pio_pop_handler;
953
954 return pkt->handler->try_run(pkt, is_done);
955}
956
957static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
958{
959 struct usbhs_pipe *pipe = pkt->pipe;
960 int maxp = usbhs_pipe_get_maxpacket(pipe);
961
962 usbhsf_dma_stop(pipe, pipe->fifo);
963 usbhsf_dma_unmap(pkt);
964 usbhsf_fifo_unselect(pipe, pipe->fifo);
965
966 pkt->actual += pkt->trans;
967
968 if ((pkt->actual == pkt->length) || /* receive all data */
969 (pkt->trans < maxp)) { /* short packet */
970 *is_done = 1;
971 } else {
972 /* re-enable */
973 usbhsf_prepare_pop(pkt, is_done);
974 }
975
976 return 0;
977}
978
979struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
980 .prepare = usbhsf_prepare_pop,
981 .try_run = usbhsf_dma_try_pop,
982 .dma_done = usbhsf_dma_pop_done
983};
984
985/*
986 * DMA setting
987 */
988static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
989{
990 struct sh_dmae_slave *slave = param;
991
992 /*
993 * FIXME
994 *
995 * usbhs doesn't recognize id = 0 as valid DMA
996 */
997 if (0 == slave->slave_id)
998 return false;
999
1000 chan->private = slave;
1001
1002 return true;
1003}
1004
1005static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1006{
1007 if (fifo->tx_chan)
1008 dma_release_channel(fifo->tx_chan);
1009 if (fifo->rx_chan)
1010 dma_release_channel(fifo->rx_chan);
1011
1012 fifo->tx_chan = NULL;
1013 fifo->rx_chan = NULL;
1014}
1015
1016static void usbhsf_dma_init(struct usbhs_priv *priv,
1017 struct usbhs_fifo *fifo)
1018{
1019 struct device *dev = usbhs_priv_to_dev(priv);
1020 dma_cap_mask_t mask;
1021
1022 dma_cap_zero(mask);
1023 dma_cap_set(DMA_SLAVE, mask);
1024 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1025 &fifo->tx_slave);
1026
1027 dma_cap_zero(mask);
1028 dma_cap_set(DMA_SLAVE, mask);
1029 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1030 &fifo->rx_slave);
1031
1032 if (fifo->tx_chan || fifo->rx_chan)
1033 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1034 fifo->name,
1035 fifo->tx_chan ? "[TX]" : " ",
1036 fifo->rx_chan ? "[RX]" : " ");
1037}
1038
1039/*
1040 * irq functions
1041 */
1042static int usbhsf_irq_empty(struct usbhs_priv *priv,
1043 struct usbhs_irq_state *irq_state)
1044{
1045 struct usbhs_pipe *pipe;
1046 struct device *dev = usbhs_priv_to_dev(priv);
1047 int i, ret;
1048
1049 if (!irq_state->bempsts) {
1050 dev_err(dev, "debug %s !!\n", __func__);
1051 return -EIO;
1052 }
1053
1054 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1055
1056 /*
1057 * search interrupted "pipe"
1058 * not "uep".
1059 */
1060 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1061 if (!(irq_state->bempsts & (1 << i)))
1062 continue;
1063
1064 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1065 if (ret < 0)
1066 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1067 }
1068
1069 return 0;
1070}
1071
1072static int usbhsf_irq_ready(struct usbhs_priv *priv,
1073 struct usbhs_irq_state *irq_state)
1074{
1075 struct usbhs_pipe *pipe;
1076 struct device *dev = usbhs_priv_to_dev(priv);
1077 int i, ret;
1078
1079 if (!irq_state->brdysts) {
1080 dev_err(dev, "debug %s !!\n", __func__);
1081 return -EIO;
1082 }
1083
1084 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1085
1086 /*
1087 * search interrupted "pipe"
1088 * not "uep".
1089 */
1090 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1091 if (!(irq_state->brdysts & (1 << i)))
1092 continue;
1093
1094 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1095 if (ret < 0)
1096 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1097 }
1098
1099 return 0;
1100}
1101
1102static void usbhsf_dma_complete(void *arg)
1103{
1104 struct usbhs_pipe *pipe = arg;
1105 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1106 struct device *dev = usbhs_priv_to_dev(priv);
1107 int ret;
1108
1109 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1110 if (ret < 0)
1111 dev_err(dev, "dma_complete run_error %d : %d\n",
1112 usbhs_pipe_number(pipe), ret);
1113}
1114
1115/*
1116 * fifo init
1117 */
1118void usbhs_fifo_init(struct usbhs_priv *priv)
1119{
1120 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1121 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1122 struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv);
1123 struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv);
1124
1125 mod->irq_empty = usbhsf_irq_empty;
1126 mod->irq_ready = usbhsf_irq_ready;
1127 mod->irq_bempsts = 0;
1128 mod->irq_brdysts = 0;
1129
1130 cfifo->pipe = NULL;
1131 cfifo->tx_chan = NULL;
1132 cfifo->rx_chan = NULL;
1133
1134 d0fifo->pipe = NULL;
1135 d0fifo->tx_chan = NULL;
1136 d0fifo->rx_chan = NULL;
1137
1138 d1fifo->pipe = NULL;
1139 d1fifo->tx_chan = NULL;
1140 d1fifo->rx_chan = NULL;
1141
1142 usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv));
1143 usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv));
1144}
1145
1146void usbhs_fifo_quit(struct usbhs_priv *priv)
1147{
1148 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1149
1150 mod->irq_empty = NULL;
1151 mod->irq_ready = NULL;
1152 mod->irq_bempsts = 0;
1153 mod->irq_brdysts = 0;
1154
1155 usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv));
1156 usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv));
1157}
1158
1159int usbhs_fifo_probe(struct usbhs_priv *priv)
1160{
1161 struct usbhs_fifo *fifo;
1162
1163 /* CFIFO */
1164 fifo = usbhsf_get_cfifo(priv);
1165 fifo->name = "CFIFO";
1166 fifo->port = CFIFO;
1167 fifo->sel = CFIFOSEL;
1168 fifo->ctr = CFIFOCTR;
1169
1170 /* D0FIFO */
1171 fifo = usbhsf_get_d0fifo(priv);
1172 fifo->name = "D0FIFO";
1173 fifo->port = D0FIFO;
1174 fifo->sel = D0FIFOSEL;
1175 fifo->ctr = D0FIFOCTR;
1176 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d0_tx_id);
1177 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d0_rx_id);
1178
1179 /* D1FIFO */
1180 fifo = usbhsf_get_d1fifo(priv);
1181 fifo->name = "D1FIFO";
1182 fifo->port = D1FIFO;
1183 fifo->sel = D1FIFOSEL;
1184 fifo->ctr = D1FIFOCTR;
1185 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d1_tx_id);
1186 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d1_rx_id);
1187
1188 return 0;
1189}
1190
1191void usbhs_fifo_remove(struct usbhs_priv *priv)
1192{
1193}