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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / renesas_usbhs / fifo.c
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 if (likely(func))
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
187 void 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, irq_bempsts, e)
196 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_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->status |= status; \
206 else \
207 mod->status &= ~status; \
208 usbhs_irq_callback_update(priv, mod); \
209 })
210
211 static 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
228 static 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 */
236 static 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
244 static 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
260 static 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
271 static 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
277 static 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
286 static 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 */
330 static 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
359 static 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
387 static 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
402 struct 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
407 struct 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 */
415 static 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
429 struct 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 */
436 static 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
468 struct 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 */
475 static 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 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
492
493 ret = usbhsf_fifo_select(pipe, fifo, 1);
494 if (ret < 0)
495 return 0;
496
497 ret = usbhs_pipe_is_accessible(pipe);
498 if (ret < 0) {
499 /* inaccessible pipe is not an error */
500 ret = 0;
501 goto usbhs_fifo_write_busy;
502 }
503
504 ret = usbhsf_fifo_barrier(priv, fifo);
505 if (ret < 0)
506 goto usbhs_fifo_write_busy;
507
508 buf = pkt->buf + pkt->actual;
509 len = pkt->length - pkt->actual;
510 len = min(len, maxp);
511 total_len = len;
512 is_short = total_len < maxp;
513
514 /*
515 * FIXME
516 *
517 * 32-bit access only
518 */
519 if (len >= 4 && !((unsigned long)buf & 0x03)) {
520 iowrite32_rep(addr, buf, len / 4);
521 len %= 4;
522 buf += total_len - len;
523 }
524
525 /* the rest operation */
526 for (i = 0; i < len; i++)
527 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
528
529 /*
530 * variable update
531 */
532 pkt->actual += total_len;
533
534 if (pkt->actual < pkt->length)
535 *is_done = 0; /* there are remainder data */
536 else if (is_short)
537 *is_done = 1; /* short packet */
538 else
539 *is_done = !pkt->zero; /* send zero packet ? */
540
541 /*
542 * pipe/irq handling
543 */
544 if (is_short)
545 usbhsf_send_terminator(pipe, fifo);
546
547 usbhsf_tx_irq_ctrl(pipe, !*is_done);
548 usbhs_pipe_enable(pipe);
549
550 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
551 usbhs_pipe_number(pipe),
552 pkt->length, pkt->actual, *is_done, pkt->zero);
553
554 /*
555 * Transmission end
556 */
557 if (*is_done) {
558 if (usbhs_pipe_is_dcp(pipe))
559 usbhs_dcp_control_transfer_done(pipe);
560 }
561
562 usbhsf_fifo_unselect(pipe, fifo);
563
564 return 0;
565
566 usbhs_fifo_write_busy:
567 usbhsf_fifo_unselect(pipe, fifo);
568
569 /*
570 * pipe is busy.
571 * retry in interrupt
572 */
573 usbhsf_tx_irq_ctrl(pipe, 1);
574
575 return ret;
576 }
577
578 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
579 .prepare = usbhsf_pio_try_push,
580 .try_run = usbhsf_pio_try_push,
581 };
582
583 /*
584 * PIO pop handler
585 */
586 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
587 {
588 struct usbhs_pipe *pipe = pkt->pipe;
589
590 if (usbhs_pipe_is_busy(pipe))
591 return 0;
592
593 /*
594 * pipe enable to prepare packet receive
595 */
596 usbhs_pipe_data_sequence(pipe, pkt->sequence);
597 pkt->sequence = -1; /* -1 sequence will be ignored */
598
599 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
600 usbhs_pipe_enable(pipe);
601 usbhsf_rx_irq_ctrl(pipe, 1);
602
603 return 0;
604 }
605
606 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
607 {
608 struct usbhs_pipe *pipe = pkt->pipe;
609 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
610 struct device *dev = usbhs_priv_to_dev(priv);
611 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
612 void __iomem *addr = priv->base + fifo->port;
613 u8 *buf;
614 u32 data = 0;
615 int maxp = usbhs_pipe_get_maxpacket(pipe);
616 int rcv_len, len;
617 int i, ret;
618 int total_len = 0;
619
620 ret = usbhsf_fifo_select(pipe, fifo, 0);
621 if (ret < 0)
622 return 0;
623
624 ret = usbhsf_fifo_barrier(priv, fifo);
625 if (ret < 0)
626 goto usbhs_fifo_read_busy;
627
628 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
629
630 buf = pkt->buf + pkt->actual;
631 len = pkt->length - pkt->actual;
632 len = min(len, rcv_len);
633 total_len = len;
634
635 /*
636 * update actual length first here to decide disable pipe.
637 * if this pipe keeps BUF status and all data were popped,
638 * then, next interrupt/token will be issued again
639 */
640 pkt->actual += total_len;
641
642 if ((pkt->actual == pkt->length) || /* receive all data */
643 (total_len < maxp)) { /* short packet */
644 *is_done = 1;
645 usbhsf_rx_irq_ctrl(pipe, 0);
646 usbhs_pipe_disable(pipe); /* disable pipe first */
647 }
648
649 /*
650 * Buffer clear if Zero-Length packet
651 *
652 * see
653 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
654 */
655 if (0 == rcv_len) {
656 pkt->zero = 1;
657 usbhsf_fifo_clear(pipe, fifo);
658 goto usbhs_fifo_read_end;
659 }
660
661 /*
662 * FIXME
663 *
664 * 32-bit access only
665 */
666 if (len >= 4 && !((unsigned long)buf & 0x03)) {
667 ioread32_rep(addr, buf, len / 4);
668 len %= 4;
669 buf += total_len - len;
670 }
671
672 /* the rest operation */
673 for (i = 0; i < len; i++) {
674 if (!(i & 0x03))
675 data = ioread32(addr);
676
677 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
678 }
679
680 usbhs_fifo_read_end:
681 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
682 usbhs_pipe_number(pipe),
683 pkt->length, pkt->actual, *is_done, pkt->zero);
684
685 usbhs_fifo_read_busy:
686 usbhsf_fifo_unselect(pipe, fifo);
687
688 return ret;
689 }
690
691 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
692 .prepare = usbhsf_prepare_pop,
693 .try_run = usbhsf_pio_try_pop,
694 };
695
696 /*
697 * DCP ctrol statge handler
698 */
699 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
700 {
701 usbhs_dcp_control_transfer_done(pkt->pipe);
702
703 *is_done = 1;
704
705 return 0;
706 }
707
708 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
709 .prepare = usbhsf_ctrl_stage_end,
710 .try_run = usbhsf_ctrl_stage_end,
711 };
712
713 /*
714 * DMA fifo functions
715 */
716 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
717 struct usbhs_pkt *pkt)
718 {
719 if (&usbhs_fifo_dma_push_handler == pkt->handler)
720 return fifo->tx_chan;
721
722 if (&usbhs_fifo_dma_pop_handler == pkt->handler)
723 return fifo->rx_chan;
724
725 return NULL;
726 }
727
728 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
729 struct usbhs_pkt *pkt)
730 {
731 struct usbhs_fifo *fifo;
732
733 /* DMA :: D0FIFO */
734 fifo = usbhsf_get_d0fifo(priv);
735 if (usbhsf_dma_chan_get(fifo, pkt) &&
736 !usbhsf_fifo_is_busy(fifo))
737 return fifo;
738
739 /* DMA :: D1FIFO */
740 fifo = usbhsf_get_d1fifo(priv);
741 if (usbhsf_dma_chan_get(fifo, pkt) &&
742 !usbhsf_fifo_is_busy(fifo))
743 return fifo;
744
745 return NULL;
746 }
747
748 #define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE)
749 #define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0)
750 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
751 struct usbhs_fifo *fifo,
752 u16 dreqe)
753 {
754 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
755
756 usbhs_bset(priv, fifo->sel, DREQE, dreqe);
757 }
758
759 #define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1)
760 #define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
761 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
762 {
763 struct usbhs_pipe *pipe = pkt->pipe;
764 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
765 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
766
767 return info->dma_map_ctrl(pkt, map);
768 }
769
770 static void usbhsf_dma_complete(void *arg);
771 static void xfer_work(struct work_struct *work)
772 {
773 struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
774 struct usbhs_pipe *pipe = pkt->pipe;
775 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
776 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
777 struct dma_async_tx_descriptor *desc;
778 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
779 struct device *dev = usbhs_priv_to_dev(priv);
780 enum dma_transfer_direction dir;
781
782 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
783
784 desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
785 pkt->trans, dir,
786 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
787 if (!desc)
788 return;
789
790 desc->callback = usbhsf_dma_complete;
791 desc->callback_param = pipe;
792
793 if (dmaengine_submit(desc) < 0) {
794 dev_err(dev, "Failed to submit dma descriptor\n");
795 return;
796 }
797
798 dev_dbg(dev, " %s %d (%d/ %d)\n",
799 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
800
801 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
802 usbhs_pipe_enable(pipe);
803 usbhsf_dma_start(pipe, fifo);
804 dma_async_issue_pending(chan);
805 }
806
807 /*
808 * DMA push handler
809 */
810 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
811 {
812 struct usbhs_pipe *pipe = pkt->pipe;
813 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
814 struct usbhs_fifo *fifo;
815 int len = pkt->length - pkt->actual;
816 int ret;
817
818 if (usbhs_pipe_is_busy(pipe))
819 return 0;
820
821 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
822 if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
823 usbhs_pipe_is_dcp(pipe))
824 goto usbhsf_pio_prepare_push;
825
826 if (len & 0x7) /* 8byte alignment */
827 goto usbhsf_pio_prepare_push;
828
829 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
830 goto usbhsf_pio_prepare_push;
831
832 /* get enable DMA fifo */
833 fifo = usbhsf_get_dma_fifo(priv, pkt);
834 if (!fifo)
835 goto usbhsf_pio_prepare_push;
836
837 if (usbhsf_dma_map(pkt) < 0)
838 goto usbhsf_pio_prepare_push;
839
840 ret = usbhsf_fifo_select(pipe, fifo, 0);
841 if (ret < 0)
842 goto usbhsf_pio_prepare_push_unmap;
843
844 pkt->trans = len;
845
846 INIT_WORK(&pkt->work, xfer_work);
847 schedule_work(&pkt->work);
848
849 return 0;
850
851 usbhsf_pio_prepare_push_unmap:
852 usbhsf_dma_unmap(pkt);
853 usbhsf_pio_prepare_push:
854 /*
855 * change handler to PIO
856 */
857 pkt->handler = &usbhs_fifo_pio_push_handler;
858
859 return pkt->handler->prepare(pkt, is_done);
860 }
861
862 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
863 {
864 struct usbhs_pipe *pipe = pkt->pipe;
865
866 pkt->actual = pkt->trans;
867
868 *is_done = !pkt->zero; /* send zero packet ? */
869
870 usbhsf_dma_stop(pipe, pipe->fifo);
871 usbhsf_dma_unmap(pkt);
872 usbhsf_fifo_unselect(pipe, pipe->fifo);
873
874 return 0;
875 }
876
877 struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
878 .prepare = usbhsf_dma_prepare_push,
879 .dma_done = usbhsf_dma_push_done,
880 };
881
882 /*
883 * DMA pop handler
884 */
885 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
886 {
887 struct usbhs_pipe *pipe = pkt->pipe;
888 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
889 struct usbhs_fifo *fifo;
890 int len, ret;
891
892 if (usbhs_pipe_is_busy(pipe))
893 return 0;
894
895 if (usbhs_pipe_is_dcp(pipe))
896 goto usbhsf_pio_prepare_pop;
897
898 /* get enable DMA fifo */
899 fifo = usbhsf_get_dma_fifo(priv, pkt);
900 if (!fifo)
901 goto usbhsf_pio_prepare_pop;
902
903 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
904 goto usbhsf_pio_prepare_pop;
905
906 ret = usbhsf_fifo_select(pipe, fifo, 0);
907 if (ret < 0)
908 goto usbhsf_pio_prepare_pop;
909
910 /* use PIO if packet is less than pio_dma_border */
911 len = usbhsf_fifo_rcv_len(priv, fifo);
912 len = min(pkt->length - pkt->actual, len);
913 if (len & 0x7) /* 8byte alignment */
914 goto usbhsf_pio_prepare_pop_unselect;
915
916 if (len < usbhs_get_dparam(priv, pio_dma_border))
917 goto usbhsf_pio_prepare_pop_unselect;
918
919 ret = usbhsf_fifo_barrier(priv, fifo);
920 if (ret < 0)
921 goto usbhsf_pio_prepare_pop_unselect;
922
923 if (usbhsf_dma_map(pkt) < 0)
924 goto usbhsf_pio_prepare_pop_unselect;
925
926 /* DMA */
927
928 /*
929 * usbhs_fifo_dma_pop_handler :: prepare
930 * enabled irq to come here.
931 * but it is no longer needed for DMA. disable it.
932 */
933 usbhsf_rx_irq_ctrl(pipe, 0);
934
935 pkt->trans = len;
936
937 usbhsf_tx_irq_ctrl(pipe, 0);
938 INIT_WORK(&pkt->work, xfer_work);
939 schedule_work(&pkt->work);
940
941 return 0;
942
943 usbhsf_pio_prepare_pop_unselect:
944 usbhsf_fifo_unselect(pipe, fifo);
945 usbhsf_pio_prepare_pop:
946
947 /*
948 * change handler to PIO
949 */
950 pkt->handler = &usbhs_fifo_pio_pop_handler;
951
952 return pkt->handler->try_run(pkt, is_done);
953 }
954
955 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
956 {
957 struct usbhs_pipe *pipe = pkt->pipe;
958 int maxp = usbhs_pipe_get_maxpacket(pipe);
959
960 usbhsf_dma_stop(pipe, pipe->fifo);
961 usbhsf_dma_unmap(pkt);
962 usbhsf_fifo_unselect(pipe, pipe->fifo);
963
964 pkt->actual += pkt->trans;
965
966 if ((pkt->actual == pkt->length) || /* receive all data */
967 (pkt->trans < maxp)) { /* short packet */
968 *is_done = 1;
969 } else {
970 /* re-enable */
971 usbhsf_prepare_pop(pkt, is_done);
972 }
973
974 return 0;
975 }
976
977 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
978 .prepare = usbhsf_prepare_pop,
979 .try_run = usbhsf_dma_try_pop,
980 .dma_done = usbhsf_dma_pop_done
981 };
982
983 /*
984 * DMA setting
985 */
986 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
987 {
988 struct sh_dmae_slave *slave = param;
989
990 /*
991 * FIXME
992 *
993 * usbhs doesn't recognize id = 0 as valid DMA
994 */
995 if (0 == slave->shdma_slave.slave_id)
996 return false;
997
998 chan->private = slave;
999
1000 return true;
1001 }
1002
1003 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1004 {
1005 if (fifo->tx_chan)
1006 dma_release_channel(fifo->tx_chan);
1007 if (fifo->rx_chan)
1008 dma_release_channel(fifo->rx_chan);
1009
1010 fifo->tx_chan = NULL;
1011 fifo->rx_chan = NULL;
1012 }
1013
1014 static void usbhsf_dma_init(struct usbhs_priv *priv,
1015 struct usbhs_fifo *fifo)
1016 {
1017 struct device *dev = usbhs_priv_to_dev(priv);
1018 dma_cap_mask_t mask;
1019
1020 dma_cap_zero(mask);
1021 dma_cap_set(DMA_SLAVE, mask);
1022 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1023 &fifo->tx_slave);
1024
1025 dma_cap_zero(mask);
1026 dma_cap_set(DMA_SLAVE, mask);
1027 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1028 &fifo->rx_slave);
1029
1030 if (fifo->tx_chan || fifo->rx_chan)
1031 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1032 fifo->name,
1033 fifo->tx_chan ? "[TX]" : " ",
1034 fifo->rx_chan ? "[RX]" : " ");
1035 }
1036
1037 /*
1038 * irq functions
1039 */
1040 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1041 struct usbhs_irq_state *irq_state)
1042 {
1043 struct usbhs_pipe *pipe;
1044 struct device *dev = usbhs_priv_to_dev(priv);
1045 int i, ret;
1046
1047 if (!irq_state->bempsts) {
1048 dev_err(dev, "debug %s !!\n", __func__);
1049 return -EIO;
1050 }
1051
1052 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1053
1054 /*
1055 * search interrupted "pipe"
1056 * not "uep".
1057 */
1058 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1059 if (!(irq_state->bempsts & (1 << i)))
1060 continue;
1061
1062 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1063 if (ret < 0)
1064 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1065 }
1066
1067 return 0;
1068 }
1069
1070 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1071 struct usbhs_irq_state *irq_state)
1072 {
1073 struct usbhs_pipe *pipe;
1074 struct device *dev = usbhs_priv_to_dev(priv);
1075 int i, ret;
1076
1077 if (!irq_state->brdysts) {
1078 dev_err(dev, "debug %s !!\n", __func__);
1079 return -EIO;
1080 }
1081
1082 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1083
1084 /*
1085 * search interrupted "pipe"
1086 * not "uep".
1087 */
1088 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1089 if (!(irq_state->brdysts & (1 << i)))
1090 continue;
1091
1092 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1093 if (ret < 0)
1094 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1095 }
1096
1097 return 0;
1098 }
1099
1100 static void usbhsf_dma_complete(void *arg)
1101 {
1102 struct usbhs_pipe *pipe = arg;
1103 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1104 struct device *dev = usbhs_priv_to_dev(priv);
1105 int ret;
1106
1107 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1108 if (ret < 0)
1109 dev_err(dev, "dma_complete run_error %d : %d\n",
1110 usbhs_pipe_number(pipe), ret);
1111 }
1112
1113 /*
1114 * fifo init
1115 */
1116 void usbhs_fifo_init(struct usbhs_priv *priv)
1117 {
1118 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1119 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1120 struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv);
1121 struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv);
1122
1123 mod->irq_empty = usbhsf_irq_empty;
1124 mod->irq_ready = usbhsf_irq_ready;
1125 mod->irq_bempsts = 0;
1126 mod->irq_brdysts = 0;
1127
1128 cfifo->pipe = NULL;
1129 cfifo->tx_chan = NULL;
1130 cfifo->rx_chan = NULL;
1131
1132 d0fifo->pipe = NULL;
1133 d0fifo->tx_chan = NULL;
1134 d0fifo->rx_chan = NULL;
1135
1136 d1fifo->pipe = NULL;
1137 d1fifo->tx_chan = NULL;
1138 d1fifo->rx_chan = NULL;
1139
1140 usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv));
1141 usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv));
1142 }
1143
1144 void usbhs_fifo_quit(struct usbhs_priv *priv)
1145 {
1146 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1147
1148 mod->irq_empty = NULL;
1149 mod->irq_ready = NULL;
1150 mod->irq_bempsts = 0;
1151 mod->irq_brdysts = 0;
1152
1153 usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv));
1154 usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv));
1155 }
1156
1157 int usbhs_fifo_probe(struct usbhs_priv *priv)
1158 {
1159 struct usbhs_fifo *fifo;
1160
1161 /* CFIFO */
1162 fifo = usbhsf_get_cfifo(priv);
1163 fifo->name = "CFIFO";
1164 fifo->port = CFIFO;
1165 fifo->sel = CFIFOSEL;
1166 fifo->ctr = CFIFOCTR;
1167
1168 /* D0FIFO */
1169 fifo = usbhsf_get_d0fifo(priv);
1170 fifo->name = "D0FIFO";
1171 fifo->port = D0FIFO;
1172 fifo->sel = D0FIFOSEL;
1173 fifo->ctr = D0FIFOCTR;
1174 fifo->tx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d0_tx_id);
1175 fifo->rx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d0_rx_id);
1176
1177 /* D1FIFO */
1178 fifo = usbhsf_get_d1fifo(priv);
1179 fifo->name = "D1FIFO";
1180 fifo->port = D1FIFO;
1181 fifo->sel = D1FIFOSEL;
1182 fifo->ctr = D1FIFOCTR;
1183 fifo->tx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d1_tx_id);
1184 fifo->rx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d1_rx_id);
1185
1186 return 0;
1187 }
1188
1189 void usbhs_fifo_remove(struct usbhs_priv *priv)
1190 {
1191 }
kernel source for telekom puls (alcatel/mediatek)