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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / drivers / usb / renesas_usbhs / fifo.c
blobd49f9c3260350b979a9770da563d36b4d9d1696c
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 */
33 void usbhs_pkt_init(struct usbhs_pkt *pkt)
34 {
35 INIT_LIST_HEAD(&pkt->node);
36 }
37
38 /*
39 * packet control function
40 */
41 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
42 {
43 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
44 struct device *dev = usbhs_priv_to_dev(priv);
45
46 dev_err(dev, "null handler\n");
47
48 return -EINVAL;
49 }
50
51 static struct usbhs_pkt_handle usbhsf_null_handler = {
52 .prepare = usbhsf_null_handle,
53 .try_run = usbhsf_null_handle,
54 };
55
56 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
57 void (*done)(struct usbhs_priv *priv,
58 struct usbhs_pkt *pkt),
59 void *buf, int len, int zero, int sequence)
60 {
61 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
62 struct device *dev = usbhs_priv_to_dev(priv);
63 unsigned long flags;
64
65 if (!done) {
66 dev_err(dev, "no done function\n");
67 return;
68 }
69
70 /******************** spin lock ********************/
71 usbhs_lock(priv, flags);
72
73 if (!pipe->handler) {
74 dev_err(dev, "no handler function\n");
75 pipe->handler = &usbhsf_null_handler;
76 }
77
78 list_move_tail(&pkt->node, &pipe->list);
79
80 /*
81 * each pkt must hold own handler.
82 * because handler might be changed by its situation.
83 * dma handler -> pio handler.
84 */
85 pkt->pipe = pipe;
86 pkt->buf = buf;
87 pkt->handler = pipe->handler;
88 pkt->length = len;
89 pkt->zero = zero;
90 pkt->actual = 0;
91 pkt->done = done;
92 pkt->sequence = sequence;
93
94 usbhs_unlock(priv, flags);
95 /******************** spin unlock ******************/
96 }
97
98 static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
99 {
100 list_del_init(&pkt->node);
101 }
102
103 static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
104 {
105 if (list_empty(&pipe->list))
106 return NULL;
107
108 return list_first_entry(&pipe->list, struct usbhs_pkt, node);
109 }
110
111 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
112 {
113 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
114 unsigned long flags;
115
116 /******************** spin lock ********************/
117 usbhs_lock(priv, flags);
118
119 if (!pkt)
120 pkt = __usbhsf_pkt_get(pipe);
121
122 if (pkt)
123 __usbhsf_pkt_del(pkt);
124
125 usbhs_unlock(priv, flags);
126 /******************** spin unlock ******************/
127
128 return pkt;
129 }
130
131 enum {
132 USBHSF_PKT_PREPARE,
133 USBHSF_PKT_TRY_RUN,
134 USBHSF_PKT_DMA_DONE,
135 };
136
137 static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
138 {
139 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
140 struct usbhs_pkt *pkt;
141 struct device *dev = usbhs_priv_to_dev(priv);
142 int (*func)(struct usbhs_pkt *pkt, int *is_done);
143 unsigned long flags;
144 int ret = 0;
145 int is_done = 0;
146
147 /******************** spin lock ********************/
148 usbhs_lock(priv, flags);
149
150 pkt = __usbhsf_pkt_get(pipe);
151 if (!pkt)
152 goto __usbhs_pkt_handler_end;
153
154 switch (type) {
155 case USBHSF_PKT_PREPARE:
156 func = pkt->handler->prepare;
157 break;
158 case USBHSF_PKT_TRY_RUN:
159 func = pkt->handler->try_run;
160 break;
161 case USBHSF_PKT_DMA_DONE:
162 func = pkt->handler->dma_done;
163 break;
164 default:
165 dev_err(dev, "unknown pkt handler\n");
166 goto __usbhs_pkt_handler_end;
167 }
168
169 ret = func(pkt, &is_done);
170
171 if (is_done)
172 __usbhsf_pkt_del(pkt);
173
174 __usbhs_pkt_handler_end:
175 usbhs_unlock(priv, flags);
176 /******************** spin unlock ******************/
177
178 if (is_done) {
179 pkt->done(priv, pkt);
180 usbhs_pkt_start(pipe);
181 }
182
183 return ret;
184 }
185
186 void usbhs_pkt_start(struct usbhs_pipe *pipe)
187 {
188 usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
189 }
190
191 /*
192 * irq enable/disable function
193 */
194 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
195 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
196 #define usbhsf_irq_callback_ctrl(pipe, status, enable) \
197 ({ \
198 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); \
199 struct usbhs_mod *mod = usbhs_mod_get_current(priv); \
200 u16 status = (1 << usbhs_pipe_number(pipe)); \
201 if (!mod) \
202 return; \
203 if (enable) \
204 mod->status |= status; \
205 else \
206 mod->status &= ~status; \
207 usbhs_irq_callback_update(priv, mod); \
208 })
209
210 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
211 {
212 /*
213 * And DCP pipe can NOT use "ready interrupt" for "send"
214 * it should use "empty" interrupt.
215 * see
216 * "Operation" - "Interrupt Function" - "BRDY Interrupt"
217 *
218 * on the other hand, normal pipe can use "ready interrupt" for "send"
219 * even though it is single/double buffer
220 */
221 if (usbhs_pipe_is_dcp(pipe))
222 usbhsf_irq_empty_ctrl(pipe, enable);
223 else
224 usbhsf_irq_ready_ctrl(pipe, enable);
225 }
226
227 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
228 {
229 usbhsf_irq_ready_ctrl(pipe, enable);
230 }
231
232 /*
233 * FIFO ctrl
234 */
235 static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
236 struct usbhs_fifo *fifo)
237 {
238 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
239
240 usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
241 }
242
243 static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
244 struct usbhs_fifo *fifo)
245 {
246 int timeout = 1024;
247
248 do {
249 /* The FIFO port is accessible */
250 if (usbhs_read(priv, fifo->ctr) & FRDY)
251 return 0;
252
253 udelay(10);
254 } while (timeout--);
255
256 return -EBUSY;
257 }
258
259 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
260 struct usbhs_fifo *fifo)
261 {
262 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
263
264 if (!usbhs_pipe_is_dcp(pipe))
265 usbhsf_fifo_barrier(priv, fifo);
266
267 usbhs_write(priv, fifo->ctr, BCLR);
268 }
269
270 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
271 struct usbhs_fifo *fifo)
272 {
273 return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
274 }
275
276 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
277 struct usbhs_fifo *fifo)
278 {
279 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
280
281 usbhs_pipe_select_fifo(pipe, NULL);
282 usbhs_write(priv, fifo->sel, 0);
283 }
284
285 static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
286 struct usbhs_fifo *fifo,
287 int write)
288 {
289 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
290 struct device *dev = usbhs_priv_to_dev(priv);
291 int timeout = 1024;
292 u16 mask = ((1 << 5) | 0xF); /* mask of ISEL | CURPIPE */
293 u16 base = usbhs_pipe_number(pipe); /* CURPIPE */
294
295 if (usbhs_pipe_is_busy(pipe) ||
296 usbhsf_fifo_is_busy(fifo))
297 return -EBUSY;
298
299 if (usbhs_pipe_is_dcp(pipe)) {
300 base |= (1 == write) << 5; /* ISEL */
301
302 if (usbhs_mod_is_host(priv))
303 usbhs_dcp_dir_for_host(pipe, write);
304 }
305
306 /* "base" will be used below */
307 if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo))
308 usbhs_write(priv, fifo->sel, base);
309 else
310 usbhs_write(priv, fifo->sel, base | MBW_32);
311
312 /* check ISEL and CURPIPE value */
313 while (timeout--) {
314 if (base == (mask & usbhs_read(priv, fifo->sel))) {
315 usbhs_pipe_select_fifo(pipe, fifo);
316 return 0;
317 }
318 udelay(10);
319 }
320
321 dev_err(dev, "fifo select error\n");
322
323 return -EIO;
324 }
325
326 /*
327 * DCP status stage
328 */
329 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
330 {
331 struct usbhs_pipe *pipe = pkt->pipe;
332 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
333 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
334 struct device *dev = usbhs_priv_to_dev(priv);
335 int ret;
336
337 usbhs_pipe_disable(pipe);
338
339 ret = usbhsf_fifo_select(pipe, fifo, 1);
340 if (ret < 0) {
341 dev_err(dev, "%s() faile\n", __func__);
342 return ret;
343 }
344
345 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
346
347 usbhsf_fifo_clear(pipe, fifo);
348 usbhsf_send_terminator(pipe, fifo);
349
350 usbhsf_fifo_unselect(pipe, fifo);
351
352 usbhsf_tx_irq_ctrl(pipe, 1);
353 usbhs_pipe_enable(pipe);
354
355 return ret;
356 }
357
358 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
359 {
360 struct usbhs_pipe *pipe = pkt->pipe;
361 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
362 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
363 struct device *dev = usbhs_priv_to_dev(priv);
364 int ret;
365
366 usbhs_pipe_disable(pipe);
367
368 ret = usbhsf_fifo_select(pipe, fifo, 0);
369 if (ret < 0) {
370 dev_err(dev, "%s() fail\n", __func__);
371 return ret;
372 }
373
374 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
375 usbhsf_fifo_clear(pipe, fifo);
376
377 usbhsf_fifo_unselect(pipe, fifo);
378
379 usbhsf_rx_irq_ctrl(pipe, 1);
380 usbhs_pipe_enable(pipe);
381
382 return ret;
383
384 }
385
386 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
387 {
388 struct usbhs_pipe *pipe = pkt->pipe;
389
390 if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
391 usbhsf_tx_irq_ctrl(pipe, 0);
392 else
393 usbhsf_rx_irq_ctrl(pipe, 0);
394
395 pkt->actual = pkt->length;
396 *is_done = 1;
397
398 return 0;
399 }
400
401 struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
402 .prepare = usbhs_dcp_dir_switch_to_write,
403 .try_run = usbhs_dcp_dir_switch_done,
404 };
405
406 struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
407 .prepare = usbhs_dcp_dir_switch_to_read,
408 .try_run = usbhs_dcp_dir_switch_done,
409 };
410
411 /*
412 * DCP data stage (push)
413 */
414 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
415 {
416 struct usbhs_pipe *pipe = pkt->pipe;
417
418 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
419
420 /*
421 * change handler to PIO push
422 */
423 pkt->handler = &usbhs_fifo_pio_push_handler;
424
425 return pkt->handler->prepare(pkt, is_done);
426 }
427
428 struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
429 .prepare = usbhsf_dcp_data_stage_try_push,
430 };
431
432 /*
433 * DCP data stage (pop)
434 */
435 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
436 int *is_done)
437 {
438 struct usbhs_pipe *pipe = pkt->pipe;
439 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
440 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
441
442 if (usbhs_pipe_is_busy(pipe))
443 return 0;
444
445 /*
446 * prepare pop for DCP should
447 * - change DCP direction,
448 * - clear fifo
449 * - DATA1
450 */
451 usbhs_pipe_disable(pipe);
452
453 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
454
455 usbhsf_fifo_select(pipe, fifo, 0);
456 usbhsf_fifo_clear(pipe, fifo);
457 usbhsf_fifo_unselect(pipe, fifo);
458
459 /*
460 * change handler to PIO pop
461 */
462 pkt->handler = &usbhs_fifo_pio_pop_handler;
463
464 return pkt->handler->prepare(pkt, is_done);
465 }
466
467 struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
468 .prepare = usbhsf_dcp_data_stage_prepare_pop,
469 };
470
471 /*
472 * PIO push handler
473 */
474 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
475 {
476 struct usbhs_pipe *pipe = pkt->pipe;
477 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
478 struct device *dev = usbhs_priv_to_dev(priv);
479 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
480 void __iomem *addr = priv->base + fifo->port;
481 u8 *buf;
482 int maxp = usbhs_pipe_get_maxpacket(pipe);
483 int total_len;
484 int i, ret, len;
485 int is_short;
486
487 usbhs_pipe_data_sequence(pipe, pkt->sequence);
488 pkt->sequence = -1; /* -1 sequence will be ignored */
489
490 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
491
492 ret = usbhsf_fifo_select(pipe, fifo, 1);
493 if (ret < 0)
494 return 0;
495
496 ret = usbhs_pipe_is_accessible(pipe);
497 if (ret < 0) {
498 /* inaccessible pipe is not an error */
499 ret = 0;
500 goto usbhs_fifo_write_busy;
501 }
502
503 ret = usbhsf_fifo_barrier(priv, fifo);
504 if (ret < 0)
505 goto usbhs_fifo_write_busy;
506
507 buf = pkt->buf + pkt->actual;
508 len = pkt->length - pkt->actual;
509 len = min(len, maxp);
510 total_len = len;
511 is_short = total_len < maxp;
512
513 /*
514 * FIXME
515 *
516 * 32-bit access only
517 */
518 if (len >= 4 && !((unsigned long)buf & 0x03)) {
519 iowrite32_rep(addr, buf, len / 4);
520 len %= 4;
521 buf += total_len - len;
522 }
523
524 /* the rest operation */
525 for (i = 0; i < len; i++)
526 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
527
528 /*
529 * variable update
530 */
531 pkt->actual += total_len;
532
533 if (pkt->actual < pkt->length)
534 *is_done = 0; /* there are remainder data */
535 else if (is_short)
536 *is_done = 1; /* short packet */
537 else
538 *is_done = !pkt->zero; /* send zero packet ? */
539
540 /*
541 * pipe/irq handling
542 */
543 if (is_short)
544 usbhsf_send_terminator(pipe, fifo);
545
546 usbhsf_tx_irq_ctrl(pipe, !*is_done);
547 usbhs_pipe_enable(pipe);
548
549 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
550 usbhs_pipe_number(pipe),
551 pkt->length, pkt->actual, *is_done, pkt->zero);
552
553 /*
554 * Transmission end
555 */
556 if (*is_done) {
557 if (usbhs_pipe_is_dcp(pipe))
558 usbhs_dcp_control_transfer_done(pipe);
559 }
560
561 usbhsf_fifo_unselect(pipe, fifo);
562
563 return 0;
564
565 usbhs_fifo_write_busy:
566 usbhsf_fifo_unselect(pipe, fifo);
567
568 /*
569 * pipe is busy.
570 * retry in interrupt
571 */
572 usbhsf_tx_irq_ctrl(pipe, 1);
573
574 return ret;
575 }
576
577 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
578 .prepare = usbhsf_pio_try_push,
579 .try_run = usbhsf_pio_try_push,
580 };
581
582 /*
583 * PIO pop handler
584 */
585 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
586 {
587 struct usbhs_pipe *pipe = pkt->pipe;
588
589 if (usbhs_pipe_is_busy(pipe))
590 return 0;
591
592 /*
593 * pipe enable to prepare packet receive
594 */
595 usbhs_pipe_data_sequence(pipe, pkt->sequence);
596 pkt->sequence = -1; /* -1 sequence will be ignored */
597
598 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
599 usbhs_pipe_enable(pipe);
600 usbhsf_rx_irq_ctrl(pipe, 1);
601
602 return 0;
603 }
604
605 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
606 {
607 struct usbhs_pipe *pipe = pkt->pipe;
608 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
609 struct device *dev = usbhs_priv_to_dev(priv);
610 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
611 void __iomem *addr = priv->base + fifo->port;
612 u8 *buf;
613 u32 data = 0;
614 int maxp = usbhs_pipe_get_maxpacket(pipe);
615 int rcv_len, len;
616 int i, ret;
617 int total_len = 0;
618
619 ret = usbhsf_fifo_select(pipe, fifo, 0);
620 if (ret < 0)
621 return 0;
622
623 ret = usbhsf_fifo_barrier(priv, fifo);
624 if (ret < 0)
625 goto usbhs_fifo_read_busy;
626
627 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
628
629 buf = pkt->buf + pkt->actual;
630 len = pkt->length - pkt->actual;
631 len = min(len, rcv_len);
632 total_len = len;
633
634 /*
635 * update actual length first here to decide disable pipe.
636 * if this pipe keeps BUF status and all data were popped,
637 * then, next interrupt/token will be issued again
638 */
639 pkt->actual += total_len;
640
641 if ((pkt->actual == pkt->length) || /* receive all data */
642 (total_len < maxp)) { /* short packet */
643 *is_done = 1;
644 usbhsf_rx_irq_ctrl(pipe, 0);
645 usbhs_pipe_disable(pipe); /* disable pipe first */
646 }
647
648 /*
649 * Buffer clear if Zero-Length packet
650 *
651 * see
652 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
653 */
654 if (0 == rcv_len) {
655 pkt->zero = 1;
656 usbhsf_fifo_clear(pipe, fifo);
657 goto usbhs_fifo_read_end;
658 }
659
660 /*
661 * FIXME
662 *
663 * 32-bit access only
664 */
665 if (len >= 4 && !((unsigned long)buf & 0x03)) {
666 ioread32_rep(addr, buf, len / 4);
667 len %= 4;
668 buf += total_len - len;
669 }
670
671 /* the rest operation */
672 for (i = 0; i < len; i++) {
673 if (!(i & 0x03))
674 data = ioread32(addr);
675
676 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
677 }
678
679 usbhs_fifo_read_end:
680 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
681 usbhs_pipe_number(pipe),
682 pkt->length, pkt->actual, *is_done, pkt->zero);
683
684 usbhs_fifo_read_busy:
685 usbhsf_fifo_unselect(pipe, fifo);
686
687 return ret;
688 }
689
690 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
691 .prepare = usbhsf_prepare_pop,
692 .try_run = usbhsf_pio_try_pop,
693 };
694
695 /*
696 * DCP ctrol statge handler
697 */
698 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
699 {
700 usbhs_dcp_control_transfer_done(pkt->pipe);
701
702 *is_done = 1;
703
704 return 0;
705 }
706
707 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
708 .prepare = usbhsf_ctrl_stage_end,
709 .try_run = usbhsf_ctrl_stage_end,
710 };
711
712 /*
713 * DMA fifo functions
714 */
715 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
716 struct usbhs_pkt *pkt)
717 {
718 if (&usbhs_fifo_dma_push_handler == pkt->handler)
719 return fifo->tx_chan;
720
721 if (&usbhs_fifo_dma_pop_handler == pkt->handler)
722 return fifo->rx_chan;
723
724 return NULL;
725 }
726
727 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
728 struct usbhs_pkt *pkt)
729 {
730 struct usbhs_fifo *fifo;
731
732 /* DMA :: D0FIFO */
733 fifo = usbhsf_get_d0fifo(priv);
734 if (usbhsf_dma_chan_get(fifo, pkt) &&
735 !usbhsf_fifo_is_busy(fifo))
736 return fifo;
737
738 /* DMA :: D1FIFO */
739 fifo = usbhsf_get_d1fifo(priv);
740 if (usbhsf_dma_chan_get(fifo, pkt) &&
741 !usbhsf_fifo_is_busy(fifo))
742 return fifo;
743
744 return NULL;
745 }
746
747 #define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE)
748 #define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0)
749 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
750 struct usbhs_fifo *fifo,
751 u16 dreqe)
752 {
753 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
754
755 usbhs_bset(priv, fifo->sel, DREQE, dreqe);
756 }
757
758 #define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1)
759 #define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
760 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
761 {
762 struct usbhs_pipe *pipe = pkt->pipe;
763 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
764 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
765
766 return info->dma_map_ctrl(pkt, map);
767 }
768
769 static void usbhsf_dma_complete(void *arg);
770 static void xfer_work(struct work_struct *work)
771 {
772 struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
773 struct usbhs_pipe *pipe = pkt->pipe;
774 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
775 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
776 struct dma_async_tx_descriptor *desc;
777 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
778 struct device *dev = usbhs_priv_to_dev(priv);
779 enum dma_transfer_direction dir;
780
781 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
782
783 desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
784 pkt->trans, dir,
785 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
786 if (!desc)
787 return;
788
789 desc->callback = usbhsf_dma_complete;
790 desc->callback_param = pipe;
791
792 if (dmaengine_submit(desc) < 0) {
793 dev_err(dev, "Failed to submit dma descriptor\n");
794 return;
795 }
796
797 dev_dbg(dev, " %s %d (%d/ %d)\n",
798 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
799
800 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
801 usbhs_pipe_enable(pipe);
802 usbhsf_dma_start(pipe, fifo);
803 dma_async_issue_pending(chan);
804 }
805
806 /*
807 * DMA push handler
808 */
809 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
810 {
811 struct usbhs_pipe *pipe = pkt->pipe;
812 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
813 struct usbhs_fifo *fifo;
814 int len = pkt->length - pkt->actual;
815 int ret;
816
817 if (usbhs_pipe_is_busy(pipe))
818 return 0;
819
820 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
821 if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
822 usbhs_pipe_is_dcp(pipe))
823 goto usbhsf_pio_prepare_push;
824
825 if (len & 0x7) /* 8byte alignment */
826 goto usbhsf_pio_prepare_push;
827
828 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
829 goto usbhsf_pio_prepare_push;
830
831 /* get enable DMA fifo */
832 fifo = usbhsf_get_dma_fifo(priv, pkt);
833 if (!fifo)
834 goto usbhsf_pio_prepare_push;
835
836 if (usbhsf_dma_map(pkt) < 0)
837 goto usbhsf_pio_prepare_push;
838
839 ret = usbhsf_fifo_select(pipe, fifo, 0);
840 if (ret < 0)
841 goto usbhsf_pio_prepare_push_unmap;
842
843 pkt->trans = len;
844
845 INIT_WORK(&pkt->work, xfer_work);
846 schedule_work(&pkt->work);
847
848 return 0;
849
850 usbhsf_pio_prepare_push_unmap:
851 usbhsf_dma_unmap(pkt);
852 usbhsf_pio_prepare_push:
853 /*
854 * change handler to PIO
855 */
856 pkt->handler = &usbhs_fifo_pio_push_handler;
857
858 return pkt->handler->prepare(pkt, is_done);
859 }
860
861 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
862 {
863 struct usbhs_pipe *pipe = pkt->pipe;
864
865 pkt->actual = pkt->trans;
866
867 *is_done = !pkt->zero; /* send zero packet ? */
868
869 usbhsf_dma_stop(pipe, pipe->fifo);
870 usbhsf_dma_unmap(pkt);
871 usbhsf_fifo_unselect(pipe, pipe->fifo);
872
873 return 0;
874 }
875
876 struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
877 .prepare = usbhsf_dma_prepare_push,
878 .dma_done = usbhsf_dma_push_done,
879 };
880
881 /*
882 * DMA pop handler
883 */
884 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
885 {
886 struct usbhs_pipe *pipe = pkt->pipe;
887 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
888 struct usbhs_fifo *fifo;
889 int len, ret;
890
891 if (usbhs_pipe_is_busy(pipe))
892 return 0;
893
894 if (usbhs_pipe_is_dcp(pipe))
895 goto usbhsf_pio_prepare_pop;
896
897 /* get enable DMA fifo */
898 fifo = usbhsf_get_dma_fifo(priv, pkt);
899 if (!fifo)
900 goto usbhsf_pio_prepare_pop;
901
902 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
903 goto usbhsf_pio_prepare_pop;
904
905 ret = usbhsf_fifo_select(pipe, fifo, 0);
906 if (ret < 0)
907 goto usbhsf_pio_prepare_pop;
908
909 /* use PIO if packet is less than pio_dma_border */
910 len = usbhsf_fifo_rcv_len(priv, fifo);
911 len = min(pkt->length - pkt->actual, len);
912 if (len & 0x7) /* 8byte alignment */
913 goto usbhsf_pio_prepare_pop_unselect;
914
915 if (len < usbhs_get_dparam(priv, pio_dma_border))
916 goto usbhsf_pio_prepare_pop_unselect;
917
918 ret = usbhsf_fifo_barrier(priv, fifo);
919 if (ret < 0)
920 goto usbhsf_pio_prepare_pop_unselect;
921
922 if (usbhsf_dma_map(pkt) < 0)
923 goto usbhsf_pio_prepare_pop_unselect;
924
925 /* DMA */
926
927 /*
928 * usbhs_fifo_dma_pop_handler :: prepare
929 * enabled irq to come here.
930 * but it is no longer needed for DMA. disable it.
931 */
932 usbhsf_rx_irq_ctrl(pipe, 0);
933
934 pkt->trans = len;
935
936 INIT_WORK(&pkt->work, xfer_work);
937 schedule_work(&pkt->work);
938
939 return 0;
940
941 usbhsf_pio_prepare_pop_unselect:
942 usbhsf_fifo_unselect(pipe, fifo);
943 usbhsf_pio_prepare_pop:
944
945 /*
946 * change handler to PIO
947 */
948 pkt->handler = &usbhs_fifo_pio_pop_handler;
949
950 return pkt->handler->try_run(pkt, is_done);
951 }
952
953 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
954 {
955 struct usbhs_pipe *pipe = pkt->pipe;
956 int maxp = usbhs_pipe_get_maxpacket(pipe);
957
958 usbhsf_dma_stop(pipe, pipe->fifo);
959 usbhsf_dma_unmap(pkt);
960 usbhsf_fifo_unselect(pipe, pipe->fifo);
961
962 pkt->actual += pkt->trans;
963
964 if ((pkt->actual == pkt->length) || /* receive all data */
965 (pkt->trans < maxp)) { /* short packet */
966 *is_done = 1;
967 } else {
968 /* re-enable */
969 usbhsf_prepare_pop(pkt, is_done);
970 }
971
972 return 0;
973 }
974
975 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
976 .prepare = usbhsf_prepare_pop,
977 .try_run = usbhsf_dma_try_pop,
978 .dma_done = usbhsf_dma_pop_done
979 };
980
981 /*
982 * DMA setting
983 */
984 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
985 {
986 struct sh_dmae_slave *slave = param;
987
988 /*
989 * FIXME
990 *
991 * usbhs doesn't recognize id = 0 as valid DMA
992 */
993 if (0 == slave->shdma_slave.slave_id)
994 return false;
995
996 chan->private = slave;
997
998 return true;
999 }
1000
1001 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1002 {
1003 if (fifo->tx_chan)
1004 dma_release_channel(fifo->tx_chan);
1005 if (fifo->rx_chan)
1006 dma_release_channel(fifo->rx_chan);
1007
1008 fifo->tx_chan = NULL;
1009 fifo->rx_chan = NULL;
1010 }
1011
1012 static void usbhsf_dma_init(struct usbhs_priv *priv,
1013 struct usbhs_fifo *fifo)
1014 {
1015 struct device *dev = usbhs_priv_to_dev(priv);
1016 dma_cap_mask_t mask;
1017
1018 dma_cap_zero(mask);
1019 dma_cap_set(DMA_SLAVE, mask);
1020 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1021 &fifo->tx_slave);
1022
1023 dma_cap_zero(mask);
1024 dma_cap_set(DMA_SLAVE, mask);
1025 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1026 &fifo->rx_slave);
1027
1028 if (fifo->tx_chan || fifo->rx_chan)
1029 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1030 fifo->name,
1031 fifo->tx_chan ? "[TX]" : " ",
1032 fifo->rx_chan ? "[RX]" : " ");
1033 }
1034
1035 /*
1036 * irq functions
1037 */
1038 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1039 struct usbhs_irq_state *irq_state)
1040 {
1041 struct usbhs_pipe *pipe;
1042 struct device *dev = usbhs_priv_to_dev(priv);
1043 int i, ret;
1044
1045 if (!irq_state->bempsts) {
1046 dev_err(dev, "debug %s !!\n", __func__);
1047 return -EIO;
1048 }
1049
1050 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1051
1052 /*
1053 * search interrupted "pipe"
1054 * not "uep".
1055 */
1056 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1057 if (!(irq_state->bempsts & (1 << i)))
1058 continue;
1059
1060 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1061 if (ret < 0)
1062 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1063 }
1064
1065 return 0;
1066 }
1067
1068 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1069 struct usbhs_irq_state *irq_state)
1070 {
1071 struct usbhs_pipe *pipe;
1072 struct device *dev = usbhs_priv_to_dev(priv);
1073 int i, ret;
1074
1075 if (!irq_state->brdysts) {
1076 dev_err(dev, "debug %s !!\n", __func__);
1077 return -EIO;
1078 }
1079
1080 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1081
1082 /*
1083 * search interrupted "pipe"
1084 * not "uep".
1085 */
1086 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1087 if (!(irq_state->brdysts & (1 << i)))
1088 continue;
1089
1090 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1091 if (ret < 0)
1092 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1093 }
1094
1095 return 0;
1096 }
1097
1098 static void usbhsf_dma_complete(void *arg)
1099 {
1100 struct usbhs_pipe *pipe = arg;
1101 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1102 struct device *dev = usbhs_priv_to_dev(priv);
1103 int ret;
1104
1105 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1106 if (ret < 0)
1107 dev_err(dev, "dma_complete run_error %d : %d\n",
1108 usbhs_pipe_number(pipe), ret);
1109 }
1110
1111 /*
1112 * fifo init
1113 */
1114 void usbhs_fifo_init(struct usbhs_priv *priv)
1115 {
1116 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1117 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1118 struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv);
1119 struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv);
1120
1121 mod->irq_empty = usbhsf_irq_empty;
1122 mod->irq_ready = usbhsf_irq_ready;
1123 mod->irq_bempsts = 0;
1124 mod->irq_brdysts = 0;
1125
1126 cfifo->pipe = NULL;
1127 d0fifo->pipe = NULL;
1128 d1fifo->pipe = NULL;
1129 }
1130
1131 void usbhs_fifo_quit(struct usbhs_priv *priv)
1132 {
1133 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1134
1135 mod->irq_empty = NULL;
1136 mod->irq_ready = NULL;
1137 mod->irq_bempsts = 0;
1138 mod->irq_brdysts = 0;
1139 }
1140
1141 int usbhs_fifo_probe(struct usbhs_priv *priv)
1142 {
1143 struct usbhs_fifo *fifo;
1144
1145 /* CFIFO */
1146 fifo = usbhsf_get_cfifo(priv);
1147 fifo->name = "CFIFO";
1148 fifo->port = CFIFO;
1149 fifo->sel = CFIFOSEL;
1150 fifo->ctr = CFIFOCTR;
1151
1152 /* D0FIFO */
1153 fifo = usbhsf_get_d0fifo(priv);
1154 fifo->name = "D0FIFO";
1155 fifo->port = D0FIFO;
1156 fifo->sel = D0FIFOSEL;
1157 fifo->ctr = D0FIFOCTR;
1158 fifo->tx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d0_tx_id);
1159 fifo->rx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d0_rx_id);
1160 usbhsf_dma_init(priv, fifo);
1161
1162 /* D1FIFO */
1163 fifo = usbhsf_get_d1fifo(priv);
1164 fifo->name = "D1FIFO";
1165 fifo->port = D1FIFO;
1166 fifo->sel = D1FIFOSEL;
1167 fifo->ctr = D1FIFOCTR;
1168 fifo->tx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d1_tx_id);
1169 fifo->rx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d1_rx_id);
1170 usbhsf_dma_init(priv, fifo);
1171
1172 return 0;
1173 }
1174
1175 void usbhs_fifo_remove(struct usbhs_priv *priv)
1176 {
1177 usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv));
1178 usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv));
1179 }
Linux with added FPC-III support