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