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Merge branch 'for-linus' of git://ceph.newdream.net/git/ceph-client
[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
27 #define usbhsf_fifo_is_busy(f) ((f)->pipe) /* see usbhs_pipe_select_fifo */
28
29 /*
30 * packet initialize
31 */
32 void usbhs_pkt_init(struct usbhs_pkt *pkt)
33 {
34 pkt->dma = DMA_ADDR_INVALID;
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)
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_del_init(&pkt->node);
79 list_add_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
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_entry(pipe->list.next, 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 hander\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, bempsts, e)
195 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, 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->irq_##status |= status; \
205 else \
206 mod->irq_##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 usbhs_write(priv, fifo->sel, base | MBW_32);
308
309 /* check ISEL and CURPIPE value */
310 while (timeout--) {
311 if (base == (mask & usbhs_read(priv, fifo->sel))) {
312 usbhs_pipe_select_fifo(pipe, fifo);
313 return 0;
314 }
315 udelay(10);
316 }
317
318 dev_err(dev, "fifo select error\n");
319
320 return -EIO;
321 }
322
323 /*
324 * DCP status stage
325 */
326 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
327 {
328 struct usbhs_pipe *pipe = pkt->pipe;
329 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
330 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
331 struct device *dev = usbhs_priv_to_dev(priv);
332 int ret;
333
334 usbhs_pipe_disable(pipe);
335
336 ret = usbhsf_fifo_select(pipe, fifo, 1);
337 if (ret < 0) {
338 dev_err(dev, "%s() faile\n", __func__);
339 return ret;
340 }
341
342 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
343
344 usbhsf_fifo_clear(pipe, fifo);
345 usbhsf_send_terminator(pipe, fifo);
346
347 usbhsf_fifo_unselect(pipe, fifo);
348
349 usbhsf_tx_irq_ctrl(pipe, 1);
350 usbhs_pipe_enable(pipe);
351
352 return ret;
353 }
354
355 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
356 {
357 struct usbhs_pipe *pipe = pkt->pipe;
358 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
359 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
360 struct device *dev = usbhs_priv_to_dev(priv);
361 int ret;
362
363 usbhs_pipe_disable(pipe);
364
365 ret = usbhsf_fifo_select(pipe, fifo, 0);
366 if (ret < 0) {
367 dev_err(dev, "%s() fail\n", __func__);
368 return ret;
369 }
370
371 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
372 usbhsf_fifo_clear(pipe, fifo);
373
374 usbhsf_fifo_unselect(pipe, fifo);
375
376 usbhsf_rx_irq_ctrl(pipe, 1);
377 usbhs_pipe_enable(pipe);
378
379 return ret;
380
381 }
382
383 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
384 {
385 struct usbhs_pipe *pipe = pkt->pipe;
386
387 if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
388 usbhsf_tx_irq_ctrl(pipe, 0);
389 else
390 usbhsf_rx_irq_ctrl(pipe, 0);
391
392 pkt->actual = pkt->length;
393 *is_done = 1;
394
395 return 0;
396 }
397
398 struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
399 .prepare = usbhs_dcp_dir_switch_to_write,
400 .try_run = usbhs_dcp_dir_switch_done,
401 };
402
403 struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
404 .prepare = usbhs_dcp_dir_switch_to_read,
405 .try_run = usbhs_dcp_dir_switch_done,
406 };
407
408 /*
409 * DCP data stage (push)
410 */
411 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
412 {
413 struct usbhs_pipe *pipe = pkt->pipe;
414
415 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
416
417 /*
418 * change handler to PIO push
419 */
420 pkt->handler = &usbhs_fifo_pio_push_handler;
421
422 return pkt->handler->prepare(pkt, is_done);
423 }
424
425 struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
426 .prepare = usbhsf_dcp_data_stage_try_push,
427 };
428
429 /*
430 * DCP data stage (pop)
431 */
432 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
433 int *is_done)
434 {
435 struct usbhs_pipe *pipe = pkt->pipe;
436 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
437 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
438
439 if (usbhs_pipe_is_busy(pipe))
440 return 0;
441
442 /*
443 * prepare pop for DCP should
444 * - change DCP direction,
445 * - clear fifo
446 * - DATA1
447 */
448 usbhs_pipe_disable(pipe);
449
450 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
451
452 usbhsf_fifo_select(pipe, fifo, 0);
453 usbhsf_fifo_clear(pipe, fifo);
454 usbhsf_fifo_unselect(pipe, fifo);
455
456 /*
457 * change handler to PIO pop
458 */
459 pkt->handler = &usbhs_fifo_pio_pop_handler;
460
461 return pkt->handler->prepare(pkt, is_done);
462 }
463
464 struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
465 .prepare = usbhsf_dcp_data_stage_prepare_pop,
466 };
467
468 /*
469 * PIO push handler
470 */
471 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
472 {
473 struct usbhs_pipe *pipe = pkt->pipe;
474 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
475 struct device *dev = usbhs_priv_to_dev(priv);
476 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
477 void __iomem *addr = priv->base + fifo->port;
478 u8 *buf;
479 int maxp = usbhs_pipe_get_maxpacket(pipe);
480 int total_len;
481 int i, ret, len;
482 int is_short;
483
484 ret = usbhsf_fifo_select(pipe, fifo, 1);
485 if (ret < 0)
486 return 0;
487
488 ret = usbhs_pipe_is_accessible(pipe);
489 if (ret < 0) {
490 /* inaccessible pipe is not an error */
491 ret = 0;
492 goto usbhs_fifo_write_busy;
493 }
494
495 ret = usbhsf_fifo_barrier(priv, fifo);
496 if (ret < 0)
497 goto usbhs_fifo_write_busy;
498
499 buf = pkt->buf + pkt->actual;
500 len = pkt->length - pkt->actual;
501 len = min(len, maxp);
502 total_len = len;
503 is_short = total_len < maxp;
504
505 /*
506 * FIXME
507 *
508 * 32-bit access only
509 */
510 if (len >= 4 && !((unsigned long)buf & 0x03)) {
511 iowrite32_rep(addr, buf, len / 4);
512 len %= 4;
513 buf += total_len - len;
514 }
515
516 /* the rest operation */
517 for (i = 0; i < len; i++)
518 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
519
520 /*
521 * variable update
522 */
523 pkt->actual += total_len;
524
525 if (pkt->actual < pkt->length)
526 *is_done = 0; /* there are remainder data */
527 else if (is_short)
528 *is_done = 1; /* short packet */
529 else
530 *is_done = !pkt->zero; /* send zero packet ? */
531
532 /*
533 * pipe/irq handling
534 */
535 if (is_short)
536 usbhsf_send_terminator(pipe, fifo);
537
538 usbhsf_tx_irq_ctrl(pipe, !*is_done);
539 usbhs_pipe_enable(pipe);
540
541 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
542 usbhs_pipe_number(pipe),
543 pkt->length, pkt->actual, *is_done, pkt->zero);
544
545 /*
546 * Transmission end
547 */
548 if (*is_done) {
549 if (usbhs_pipe_is_dcp(pipe))
550 usbhs_dcp_control_transfer_done(pipe);
551 }
552
553 usbhsf_fifo_unselect(pipe, fifo);
554
555 return 0;
556
557 usbhs_fifo_write_busy:
558 usbhsf_fifo_unselect(pipe, fifo);
559
560 /*
561 * pipe is busy.
562 * retry in interrupt
563 */
564 usbhsf_tx_irq_ctrl(pipe, 1);
565
566 return ret;
567 }
568
569 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
570 .prepare = usbhsf_pio_try_push,
571 .try_run = usbhsf_pio_try_push,
572 };
573
574 /*
575 * PIO pop handler
576 */
577 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
578 {
579 struct usbhs_pipe *pipe = pkt->pipe;
580
581 if (usbhs_pipe_is_busy(pipe))
582 return 0;
583
584 /*
585 * pipe enable to prepare packet receive
586 */
587
588 usbhs_pipe_enable(pipe);
589 usbhsf_rx_irq_ctrl(pipe, 1);
590
591 return 0;
592 }
593
594 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
595 {
596 struct usbhs_pipe *pipe = pkt->pipe;
597 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
598 struct device *dev = usbhs_priv_to_dev(priv);
599 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
600 void __iomem *addr = priv->base + fifo->port;
601 u8 *buf;
602 u32 data = 0;
603 int maxp = usbhs_pipe_get_maxpacket(pipe);
604 int rcv_len, len;
605 int i, ret;
606 int total_len = 0;
607
608 ret = usbhsf_fifo_select(pipe, fifo, 0);
609 if (ret < 0)
610 return 0;
611
612 ret = usbhsf_fifo_barrier(priv, fifo);
613 if (ret < 0)
614 goto usbhs_fifo_read_busy;
615
616 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
617
618 buf = pkt->buf + pkt->actual;
619 len = pkt->length - pkt->actual;
620 len = min(len, rcv_len);
621 total_len = len;
622
623 /*
624 * update actual length first here to decide disable pipe.
625 * if this pipe keeps BUF status and all data were popped,
626 * then, next interrupt/token will be issued again
627 */
628 pkt->actual += total_len;
629
630 if ((pkt->actual == pkt->length) || /* receive all data */
631 (total_len < maxp)) { /* short packet */
632 *is_done = 1;
633 usbhsf_rx_irq_ctrl(pipe, 0);
634 usbhs_pipe_disable(pipe); /* disable pipe first */
635 }
636
637 /*
638 * Buffer clear if Zero-Length packet
639 *
640 * see
641 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
642 */
643 if (0 == rcv_len) {
644 usbhsf_fifo_clear(pipe, fifo);
645 goto usbhs_fifo_read_end;
646 }
647
648 /*
649 * FIXME
650 *
651 * 32-bit access only
652 */
653 if (len >= 4 && !((unsigned long)buf & 0x03)) {
654 ioread32_rep(addr, buf, len / 4);
655 len %= 4;
656 buf += total_len - len;
657 }
658
659 /* the rest operation */
660 for (i = 0; i < len; i++) {
661 if (!(i & 0x03))
662 data = ioread32(addr);
663
664 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
665 }
666
667 usbhs_fifo_read_end:
668 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
669 usbhs_pipe_number(pipe),
670 pkt->length, pkt->actual, *is_done, pkt->zero);
671
672 usbhs_fifo_read_busy:
673 usbhsf_fifo_unselect(pipe, fifo);
674
675 return ret;
676 }
677
678 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
679 .prepare = usbhsf_prepare_pop,
680 .try_run = usbhsf_pio_try_pop,
681 };
682
683 /*
684 * DCP ctrol statge handler
685 */
686 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
687 {
688 usbhs_dcp_control_transfer_done(pkt->pipe);
689
690 *is_done = 1;
691
692 return 0;
693 }
694
695 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
696 .prepare = usbhsf_ctrl_stage_end,
697 .try_run = usbhsf_ctrl_stage_end,
698 };
699
700 /*
701 * DMA fifo functions
702 */
703 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
704 struct usbhs_pkt *pkt)
705 {
706 if (&usbhs_fifo_dma_push_handler == pkt->handler)
707 return fifo->tx_chan;
708
709 if (&usbhs_fifo_dma_pop_handler == pkt->handler)
710 return fifo->rx_chan;
711
712 return NULL;
713 }
714
715 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
716 struct usbhs_pkt *pkt)
717 {
718 struct usbhs_fifo *fifo;
719
720 /* DMA :: D0FIFO */
721 fifo = usbhsf_get_d0fifo(priv);
722 if (usbhsf_dma_chan_get(fifo, pkt) &&
723 !usbhsf_fifo_is_busy(fifo))
724 return fifo;
725
726 /* DMA :: D1FIFO */
727 fifo = usbhsf_get_d1fifo(priv);
728 if (usbhsf_dma_chan_get(fifo, pkt) &&
729 !usbhsf_fifo_is_busy(fifo))
730 return fifo;
731
732 return NULL;
733 }
734
735 #define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE)
736 #define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0)
737 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
738 struct usbhs_fifo *fifo,
739 u16 dreqe)
740 {
741 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
742
743 usbhs_bset(priv, fifo->sel, DREQE, dreqe);
744 }
745
746 #define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1)
747 #define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
748 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
749 {
750 struct usbhs_pipe *pipe = pkt->pipe;
751 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
752 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
753
754 return info->dma_map_ctrl(pkt, map);
755 }
756
757 static void usbhsf_dma_complete(void *arg);
758 static void usbhsf_dma_prepare_tasklet(unsigned long data)
759 {
760 struct usbhs_pkt *pkt = (struct usbhs_pkt *)data;
761 struct usbhs_pipe *pipe = pkt->pipe;
762 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
763 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
764 struct scatterlist sg;
765 struct dma_async_tx_descriptor *desc;
766 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
767 struct device *dev = usbhs_priv_to_dev(priv);
768 enum dma_data_direction dir;
769 dma_cookie_t cookie;
770
771 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
772
773 sg_init_table(&sg, 1);
774 sg_set_page(&sg, virt_to_page(pkt->dma),
775 pkt->length, offset_in_page(pkt->dma));
776 sg_dma_address(&sg) = pkt->dma + pkt->actual;
777 sg_dma_len(&sg) = pkt->trans;
778
779 desc = chan->device->device_prep_slave_sg(chan, &sg, 1, dir,
780 DMA_PREP_INTERRUPT |
781 DMA_CTRL_ACK);
782 if (!desc)
783 return;
784
785 desc->callback = usbhsf_dma_complete;
786 desc->callback_param = pipe;
787
788 cookie = desc->tx_submit(desc);
789 if (cookie < 0) {
790 dev_err(dev, "Failed to submit dma descriptor\n");
791 return;
792 }
793
794 dev_dbg(dev, " %s %d (%d/ %d)\n",
795 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
796
797 usbhsf_dma_start(pipe, fifo);
798 dma_async_issue_pending(chan);
799 }
800
801 /*
802 * DMA push handler
803 */
804 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
805 {
806 struct usbhs_pipe *pipe = pkt->pipe;
807 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
808 struct usbhs_fifo *fifo;
809 int len = pkt->length - pkt->actual;
810 int ret;
811
812 if (usbhs_pipe_is_busy(pipe))
813 return 0;
814
815 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
816 if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
817 usbhs_pipe_is_dcp(pipe))
818 goto usbhsf_pio_prepare_push;
819
820 if (len % 4) /* 32bit alignment */
821 goto usbhsf_pio_prepare_push;
822
823 if ((*(u32 *) pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
824 goto usbhsf_pio_prepare_push;
825
826 /* get enable DMA fifo */
827 fifo = usbhsf_get_dma_fifo(priv, pkt);
828 if (!fifo)
829 goto usbhsf_pio_prepare_push;
830
831 if (usbhsf_dma_map(pkt) < 0)
832 goto usbhsf_pio_prepare_push;
833
834 ret = usbhsf_fifo_select(pipe, fifo, 0);
835 if (ret < 0)
836 goto usbhsf_pio_prepare_push_unmap;
837
838 pkt->trans = len;
839
840 tasklet_init(&fifo->tasklet,
841 usbhsf_dma_prepare_tasklet,
842 (unsigned long)pkt);
843
844 tasklet_schedule(&fifo->tasklet);
845
846 return 0;
847
848 usbhsf_pio_prepare_push_unmap:
849 usbhsf_dma_unmap(pkt);
850 usbhsf_pio_prepare_push:
851 /*
852 * change handler to PIO
853 */
854 pkt->handler = &usbhs_fifo_pio_push_handler;
855
856 return pkt->handler->prepare(pkt, is_done);
857 }
858
859 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
860 {
861 struct usbhs_pipe *pipe = pkt->pipe;
862
863 pkt->actual = pkt->trans;
864
865 *is_done = !pkt->zero; /* send zero packet ? */
866
867 usbhsf_dma_stop(pipe, pipe->fifo);
868 usbhsf_dma_unmap(pkt);
869 usbhsf_fifo_unselect(pipe, pipe->fifo);
870
871 return 0;
872 }
873
874 struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
875 .prepare = usbhsf_dma_prepare_push,
876 .dma_done = usbhsf_dma_push_done,
877 };
878
879 /*
880 * DMA pop handler
881 */
882 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
883 {
884 struct usbhs_pipe *pipe = pkt->pipe;
885 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
886 struct usbhs_fifo *fifo;
887 int len, ret;
888
889 if (usbhs_pipe_is_busy(pipe))
890 return 0;
891
892 if (usbhs_pipe_is_dcp(pipe))
893 goto usbhsf_pio_prepare_pop;
894
895 /* get enable DMA fifo */
896 fifo = usbhsf_get_dma_fifo(priv, pkt);
897 if (!fifo)
898 goto usbhsf_pio_prepare_pop;
899
900 if ((*(u32 *) pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
901 goto usbhsf_pio_prepare_pop;
902
903 ret = usbhsf_fifo_select(pipe, fifo, 0);
904 if (ret < 0)
905 goto usbhsf_pio_prepare_pop;
906
907 /* use PIO if packet is less than pio_dma_border */
908 len = usbhsf_fifo_rcv_len(priv, fifo);
909 len = min(pkt->length - pkt->actual, len);
910 if (len % 4) /* 32bit alignment */
911 goto usbhsf_pio_prepare_pop_unselect;
912
913 if (len < usbhs_get_dparam(priv, pio_dma_border))
914 goto usbhsf_pio_prepare_pop_unselect;
915
916 ret = usbhsf_fifo_barrier(priv, fifo);
917 if (ret < 0)
918 goto usbhsf_pio_prepare_pop_unselect;
919
920 if (usbhsf_dma_map(pkt) < 0)
921 goto usbhsf_pio_prepare_pop_unselect;
922
923 /* DMA */
924
925 /*
926 * usbhs_fifo_dma_pop_handler :: prepare
927 * enabled irq to come here.
928 * but it is no longer needed for DMA. disable it.
929 */
930 usbhsf_rx_irq_ctrl(pipe, 0);
931
932 pkt->trans = len;
933
934 tasklet_init(&fifo->tasklet,
935 usbhsf_dma_prepare_tasklet,
936 (unsigned long)pkt);
937
938 tasklet_schedule(&fifo->tasklet);
939
940 return 0;
941
942 usbhsf_pio_prepare_pop_unselect:
943 usbhsf_fifo_unselect(pipe, fifo);
944 usbhsf_pio_prepare_pop:
945
946 /*
947 * change handler to PIO
948 */
949 pkt->handler = &usbhs_fifo_pio_pop_handler;
950
951 return pkt->handler->try_run(pkt, is_done);
952 }
953
954 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
955 {
956 struct usbhs_pipe *pipe = pkt->pipe;
957 int maxp = usbhs_pipe_get_maxpacket(pipe);
958
959 usbhsf_dma_stop(pipe, pipe->fifo);
960 usbhsf_dma_unmap(pkt);
961 usbhsf_fifo_unselect(pipe, pipe->fifo);
962
963 pkt->actual += pkt->trans;
964
965 if ((pkt->actual == pkt->length) || /* receive all data */
966 (pkt->trans < maxp)) { /* short packet */
967 *is_done = 1;
968 } else {
969 /* re-enable */
970 usbhsf_prepare_pop(pkt, is_done);
971 }
972
973 return 0;
974 }
975
976 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
977 .prepare = usbhsf_prepare_pop,
978 .try_run = usbhsf_dma_try_pop,
979 .dma_done = usbhsf_dma_pop_done
980 };
981
982 /*
983 * DMA setting
984 */
985 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
986 {
987 struct sh_dmae_slave *slave = param;
988
989 /*
990 * FIXME
991 *
992 * usbhs doesn't recognize id = 0 as valid DMA
993 */
994 if (0 == slave->slave_id)
995 return false;
996
997 chan->private = slave;
998
999 return true;
1000 }
1001
1002 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1003 {
1004 if (fifo->tx_chan)
1005 dma_release_channel(fifo->tx_chan);
1006 if (fifo->rx_chan)
1007 dma_release_channel(fifo->rx_chan);
1008
1009 fifo->tx_chan = NULL;
1010 fifo->rx_chan = NULL;
1011 }
1012
1013 static void usbhsf_dma_init(struct usbhs_priv *priv,
1014 struct usbhs_fifo *fifo)
1015 {
1016 struct device *dev = usbhs_priv_to_dev(priv);
1017 dma_cap_mask_t mask;
1018
1019 dma_cap_zero(mask);
1020 dma_cap_set(DMA_SLAVE, mask);
1021 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1022 &fifo->tx_slave);
1023
1024 dma_cap_zero(mask);
1025 dma_cap_set(DMA_SLAVE, mask);
1026 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1027 &fifo->rx_slave);
1028
1029 if (fifo->tx_chan || fifo->rx_chan)
1030 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1031 fifo->name,
1032 fifo->tx_chan ? "[TX]" : " ",
1033 fifo->rx_chan ? "[RX]" : " ");
1034 }
1035
1036 /*
1037 * irq functions
1038 */
1039 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1040 struct usbhs_irq_state *irq_state)
1041 {
1042 struct usbhs_pipe *pipe;
1043 struct device *dev = usbhs_priv_to_dev(priv);
1044 int i, ret;
1045
1046 if (!irq_state->bempsts) {
1047 dev_err(dev, "debug %s !!\n", __func__);
1048 return -EIO;
1049 }
1050
1051 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1052
1053 /*
1054 * search interrupted "pipe"
1055 * not "uep".
1056 */
1057 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1058 if (!(irq_state->bempsts & (1 << i)))
1059 continue;
1060
1061 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1062 if (ret < 0)
1063 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1064 }
1065
1066 return 0;
1067 }
1068
1069 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1070 struct usbhs_irq_state *irq_state)
1071 {
1072 struct usbhs_pipe *pipe;
1073 struct device *dev = usbhs_priv_to_dev(priv);
1074 int i, ret;
1075
1076 if (!irq_state->brdysts) {
1077 dev_err(dev, "debug %s !!\n", __func__);
1078 return -EIO;
1079 }
1080
1081 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1082
1083 /*
1084 * search interrupted "pipe"
1085 * not "uep".
1086 */
1087 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1088 if (!(irq_state->brdysts & (1 << i)))
1089 continue;
1090
1091 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1092 if (ret < 0)
1093 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1094 }
1095
1096 return 0;
1097 }
1098
1099 static void usbhsf_dma_complete(void *arg)
1100 {
1101 struct usbhs_pipe *pipe = arg;
1102 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1103 struct device *dev = usbhs_priv_to_dev(priv);
1104 int ret;
1105
1106 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1107 if (ret < 0)
1108 dev_err(dev, "dma_complete run_error %d : %d\n",
1109 usbhs_pipe_number(pipe), ret);
1110 }
1111
1112 /*
1113 * fifo init
1114 */
1115 void usbhs_fifo_init(struct usbhs_priv *priv)
1116 {
1117 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1118 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1119 struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv);
1120 struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv);
1121
1122 mod->irq_empty = usbhsf_irq_empty;
1123 mod->irq_ready = usbhsf_irq_ready;
1124 mod->irq_bempsts = 0;
1125 mod->irq_brdysts = 0;
1126
1127 cfifo->pipe = NULL;
1128 cfifo->tx_chan = NULL;
1129 cfifo->rx_chan = NULL;
1130
1131 d0fifo->pipe = NULL;
1132 d0fifo->tx_chan = NULL;
1133 d0fifo->rx_chan = NULL;
1134
1135 d1fifo->pipe = NULL;
1136 d1fifo->tx_chan = NULL;
1137 d1fifo->rx_chan = NULL;
1138
1139 usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv));
1140 usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv));
1141 }
1142
1143 void usbhs_fifo_quit(struct usbhs_priv *priv)
1144 {
1145 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1146
1147 mod->irq_empty = NULL;
1148 mod->irq_ready = NULL;
1149 mod->irq_bempsts = 0;
1150 mod->irq_brdysts = 0;
1151
1152 usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv));
1153 usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv));
1154 }
1155
1156 int usbhs_fifo_probe(struct usbhs_priv *priv)
1157 {
1158 struct usbhs_fifo *fifo;
1159
1160 /* CFIFO */
1161 fifo = usbhsf_get_cfifo(priv);
1162 fifo->name = "CFIFO";
1163 fifo->port = CFIFO;
1164 fifo->sel = CFIFOSEL;
1165 fifo->ctr = CFIFOCTR;
1166
1167 /* D0FIFO */
1168 fifo = usbhsf_get_d0fifo(priv);
1169 fifo->name = "D0FIFO";
1170 fifo->port = D0FIFO;
1171 fifo->sel = D0FIFOSEL;
1172 fifo->ctr = D0FIFOCTR;
1173 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d0_tx_id);
1174 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d0_rx_id);
1175
1176 /* D1FIFO */
1177 fifo = usbhsf_get_d1fifo(priv);
1178 fifo->name = "D1FIFO";
1179 fifo->port = D1FIFO;
1180 fifo->sel = D1FIFOSEL;
1181 fifo->ctr = D1FIFOCTR;
1182 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d1_tx_id);
1183 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d1_rx_id);
1184
1185 return 0;
1186 }
1187
1188 void usbhs_fifo_remove(struct usbhs_priv *priv)
1189 {
1190 }
kernel source for telekom puls (alcatel/mediatek)