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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// SPDX-License-Identifier: GPL-1.0+
2/*
3 * Renesas USB driver
4 *
5 * Copyright (C) 2011 Renesas Solutions Corp.
6 * Copyright (C) 2019 Renesas Electronics Corporation
7 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
8 */
9#include <linux/delay.h>
10#include <linux/io.h>
11#include <linux/scatterlist.h>
12#include "common.h"
13#include "pipe.h"
14
15#define usbhsf_get_cfifo(p) (&((p)->fifo_info.cfifo))
16
17#define usbhsf_fifo_is_busy(f) ((f)->pipe) /* see usbhs_pipe_select_fifo */
18
19/*
20 * packet initialize
21 */
22void usbhs_pkt_init(struct usbhs_pkt *pkt)
23{
24 INIT_LIST_HEAD(&pkt->node);
25}
26
27/*
28 * packet control function
29 */
30static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
31{
32 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
33 struct device *dev = usbhs_priv_to_dev(priv);
34
35 dev_err(dev, "null handler\n");
36
37 return -EINVAL;
38}
39
40static const struct usbhs_pkt_handle usbhsf_null_handler = {
41 .prepare = usbhsf_null_handle,
42 .try_run = usbhsf_null_handle,
43};
44
45void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
46 void (*done)(struct usbhs_priv *priv,
47 struct usbhs_pkt *pkt),
48 void *buf, int len, int zero, int sequence)
49{
50 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
51 struct device *dev = usbhs_priv_to_dev(priv);
52 unsigned long flags;
53
54 if (!done) {
55 dev_err(dev, "no done function\n");
56 return;
57 }
58
59 /******************** spin lock ********************/
60 usbhs_lock(priv, flags);
61
62 if (!pipe->handler) {
63 dev_err(dev, "no handler function\n");
64 pipe->handler = &usbhsf_null_handler;
65 }
66
67 list_move_tail(&pkt->node, &pipe->list);
68
69 /*
70 * each pkt must hold own handler.
71 * because handler might be changed by its situation.
72 * dma handler -> pio handler.
73 */
74 pkt->pipe = pipe;
75 pkt->buf = buf;
76 pkt->handler = pipe->handler;
77 pkt->length = len;
78 pkt->zero = zero;
79 pkt->actual = 0;
80 pkt->done = done;
81 pkt->sequence = sequence;
82
83 usbhs_unlock(priv, flags);
84 /******************** spin unlock ******************/
85}
86
87static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
88{
89 list_del_init(&pkt->node);
90}
91
92struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
93{
94 return list_first_entry_or_null(&pipe->list, struct usbhs_pkt, node);
95}
96
97static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
98 struct usbhs_fifo *fifo);
99static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
100 struct usbhs_pkt *pkt);
101#define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1)
102#define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
103static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map);
104static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable);
105static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable);
106struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
107{
108 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
109 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
110 unsigned long flags;
111
112 /******************** spin lock ********************/
113 usbhs_lock(priv, flags);
114
115 usbhs_pipe_disable(pipe);
116
117 if (!pkt)
118 pkt = __usbhsf_pkt_get(pipe);
119
120 if (pkt) {
121 struct dma_chan *chan = NULL;
122
123 if (fifo)
124 chan = usbhsf_dma_chan_get(fifo, pkt);
125 if (chan) {
126 dmaengine_terminate_all(chan);
127 usbhsf_dma_unmap(pkt);
128 } else {
129 if (usbhs_pipe_is_dir_in(pipe))
130 usbhsf_rx_irq_ctrl(pipe, 0);
131 else
132 usbhsf_tx_irq_ctrl(pipe, 0);
133 }
134
135 usbhs_pipe_clear_without_sequence(pipe, 0, 0);
136 usbhs_pipe_running(pipe, 0);
137
138 __usbhsf_pkt_del(pkt);
139 }
140
141 if (fifo)
142 usbhsf_fifo_unselect(pipe, fifo);
143
144 usbhs_unlock(priv, flags);
145 /******************** spin unlock ******************/
146
147 return pkt;
148}
149
150enum {
151 USBHSF_PKT_PREPARE,
152 USBHSF_PKT_TRY_RUN,
153 USBHSF_PKT_DMA_DONE,
154};
155
156static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
157{
158 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
159 struct usbhs_pkt *pkt;
160 struct device *dev = usbhs_priv_to_dev(priv);
161 int (*func)(struct usbhs_pkt *pkt, int *is_done);
162 unsigned long flags;
163 int ret = 0;
164 int is_done = 0;
165
166 /******************** spin lock ********************/
167 usbhs_lock(priv, flags);
168
169 pkt = __usbhsf_pkt_get(pipe);
170 if (!pkt) {
171 ret = -EINVAL;
172 goto __usbhs_pkt_handler_end;
173 }
174
175 switch (type) {
176 case USBHSF_PKT_PREPARE:
177 func = pkt->handler->prepare;
178 break;
179 case USBHSF_PKT_TRY_RUN:
180 func = pkt->handler->try_run;
181 break;
182 case USBHSF_PKT_DMA_DONE:
183 func = pkt->handler->dma_done;
184 break;
185 default:
186 dev_err(dev, "unknown pkt handler\n");
187 goto __usbhs_pkt_handler_end;
188 }
189
190 if (likely(func))
191 ret = func(pkt, &is_done);
192
193 if (is_done)
194 __usbhsf_pkt_del(pkt);
195
196__usbhs_pkt_handler_end:
197 usbhs_unlock(priv, flags);
198 /******************** spin unlock ******************/
199
200 if (is_done) {
201 pkt->done(priv, pkt);
202 usbhs_pkt_start(pipe);
203 }
204
205 return ret;
206}
207
208void usbhs_pkt_start(struct usbhs_pipe *pipe)
209{
210 usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
211}
212
213/*
214 * irq enable/disable function
215 */
216#define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
217#define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
218#define usbhsf_irq_callback_ctrl(pipe, status, enable) \
219 ({ \
220 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); \
221 struct usbhs_mod *mod = usbhs_mod_get_current(priv); \
222 u16 status = (1 << usbhs_pipe_number(pipe)); \
223 if (!mod) \
224 return; \
225 if (enable) \
226 mod->status |= status; \
227 else \
228 mod->status &= ~status; \
229 usbhs_irq_callback_update(priv, mod); \
230 })
231
232static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
233{
234 /*
235 * And DCP pipe can NOT use "ready interrupt" for "send"
236 * it should use "empty" interrupt.
237 * see
238 * "Operation" - "Interrupt Function" - "BRDY Interrupt"
239 *
240 * on the other hand, normal pipe can use "ready interrupt" for "send"
241 * even though it is single/double buffer
242 */
243 if (usbhs_pipe_is_dcp(pipe))
244 usbhsf_irq_empty_ctrl(pipe, enable);
245 else
246 usbhsf_irq_ready_ctrl(pipe, enable);
247}
248
249static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
250{
251 usbhsf_irq_ready_ctrl(pipe, enable);
252}
253
254/*
255 * FIFO ctrl
256 */
257static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
258 struct usbhs_fifo *fifo)
259{
260 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
261
262 usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
263}
264
265static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
266 struct usbhs_fifo *fifo)
267{
268 /* The FIFO port is accessible */
269 if (usbhs_read(priv, fifo->ctr) & FRDY)
270 return 0;
271
272 return -EBUSY;
273}
274
275static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
276 struct usbhs_fifo *fifo)
277{
278 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
279 int ret = 0;
280
281 if (!usbhs_pipe_is_dcp(pipe)) {
282 /*
283 * This driver checks the pipe condition first to avoid -EBUSY
284 * from usbhsf_fifo_barrier() if the pipe is RX direction and
285 * empty.
286 */
287 if (usbhs_pipe_is_dir_in(pipe))
288 ret = usbhs_pipe_is_accessible(pipe);
289 if (!ret)
290 ret = usbhsf_fifo_barrier(priv, fifo);
291 }
292
293 /*
294 * if non-DCP pipe, this driver should set BCLR when
295 * usbhsf_fifo_barrier() returns 0.
296 */
297 if (!ret)
298 usbhs_write(priv, fifo->ctr, BCLR);
299}
300
301static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
302 struct usbhs_fifo *fifo)
303{
304 return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
305}
306
307static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
308 struct usbhs_fifo *fifo)
309{
310 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
311
312 usbhs_pipe_select_fifo(pipe, NULL);
313 usbhs_write(priv, fifo->sel, 0);
314}
315
316static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
317 struct usbhs_fifo *fifo,
318 int write)
319{
320 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
321 struct device *dev = usbhs_priv_to_dev(priv);
322 int timeout = 1024;
323 u16 mask = ((1 << 5) | 0xF); /* mask of ISEL | CURPIPE */
324 u16 base = usbhs_pipe_number(pipe); /* CURPIPE */
325
326 if (usbhs_pipe_is_busy(pipe) ||
327 usbhsf_fifo_is_busy(fifo))
328 return -EBUSY;
329
330 if (usbhs_pipe_is_dcp(pipe)) {
331 base |= (1 == write) << 5; /* ISEL */
332
333 if (usbhs_mod_is_host(priv))
334 usbhs_dcp_dir_for_host(pipe, write);
335 }
336
337 /* "base" will be used below */
338 usbhs_write(priv, fifo->sel, base | MBW_32);
339
340 /* check ISEL and CURPIPE value */
341 while (timeout--) {
342 if (base == (mask & usbhs_read(priv, fifo->sel))) {
343 usbhs_pipe_select_fifo(pipe, fifo);
344 return 0;
345 }
346 udelay(10);
347 }
348
349 dev_err(dev, "fifo select error\n");
350
351 return -EIO;
352}
353
354/*
355 * DCP status stage
356 */
357static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
358{
359 struct usbhs_pipe *pipe = pkt->pipe;
360 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
361 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
362 struct device *dev = usbhs_priv_to_dev(priv);
363 int ret;
364
365 usbhs_pipe_disable(pipe);
366
367 ret = usbhsf_fifo_select(pipe, fifo, 1);
368 if (ret < 0) {
369 dev_err(dev, "%s() failed\n", __func__);
370 return ret;
371 }
372
373 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
374
375 usbhsf_fifo_clear(pipe, fifo);
376 usbhsf_send_terminator(pipe, fifo);
377
378 usbhsf_fifo_unselect(pipe, fifo);
379
380 usbhsf_tx_irq_ctrl(pipe, 1);
381 usbhs_pipe_enable(pipe);
382
383 return ret;
384}
385
386static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
387{
388 struct usbhs_pipe *pipe = pkt->pipe;
389 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
390 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
391 struct device *dev = usbhs_priv_to_dev(priv);
392 int ret;
393
394 usbhs_pipe_disable(pipe);
395
396 ret = usbhsf_fifo_select(pipe, fifo, 0);
397 if (ret < 0) {
398 dev_err(dev, "%s() fail\n", __func__);
399 return ret;
400 }
401
402 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
403 usbhsf_fifo_clear(pipe, fifo);
404
405 usbhsf_fifo_unselect(pipe, fifo);
406
407 usbhsf_rx_irq_ctrl(pipe, 1);
408 usbhs_pipe_enable(pipe);
409
410 return ret;
411
412}
413
414static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
415{
416 struct usbhs_pipe *pipe = pkt->pipe;
417
418 if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
419 usbhsf_tx_irq_ctrl(pipe, 0);
420 else
421 usbhsf_rx_irq_ctrl(pipe, 0);
422
423 pkt->actual = pkt->length;
424 *is_done = 1;
425
426 return 0;
427}
428
429const struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
430 .prepare = usbhs_dcp_dir_switch_to_write,
431 .try_run = usbhs_dcp_dir_switch_done,
432};
433
434const struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
435 .prepare = usbhs_dcp_dir_switch_to_read,
436 .try_run = usbhs_dcp_dir_switch_done,
437};
438
439/*
440 * DCP data stage (push)
441 */
442static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
443{
444 struct usbhs_pipe *pipe = pkt->pipe;
445
446 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
447
448 /*
449 * change handler to PIO push
450 */
451 pkt->handler = &usbhs_fifo_pio_push_handler;
452
453 return pkt->handler->prepare(pkt, is_done);
454}
455
456const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
457 .prepare = usbhsf_dcp_data_stage_try_push,
458};
459
460/*
461 * DCP data stage (pop)
462 */
463static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
464 int *is_done)
465{
466 struct usbhs_pipe *pipe = pkt->pipe;
467 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
468 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
469
470 if (usbhs_pipe_is_busy(pipe))
471 return 0;
472
473 /*
474 * prepare pop for DCP should
475 * - change DCP direction,
476 * - clear fifo
477 * - DATA1
478 */
479 usbhs_pipe_disable(pipe);
480
481 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
482
483 usbhsf_fifo_select(pipe, fifo, 0);
484 usbhsf_fifo_clear(pipe, fifo);
485 usbhsf_fifo_unselect(pipe, fifo);
486
487 /*
488 * change handler to PIO pop
489 */
490 pkt->handler = &usbhs_fifo_pio_pop_handler;
491
492 return pkt->handler->prepare(pkt, is_done);
493}
494
495const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
496 .prepare = usbhsf_dcp_data_stage_prepare_pop,
497};
498
499/*
500 * PIO push handler
501 */
502static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
503{
504 struct usbhs_pipe *pipe = pkt->pipe;
505 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
506 struct device *dev = usbhs_priv_to_dev(priv);
507 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
508 void __iomem *addr = priv->base + fifo->port;
509 u8 *buf;
510 int maxp = usbhs_pipe_get_maxpacket(pipe);
511 int total_len;
512 int i, ret, len;
513 int is_short;
514
515 usbhs_pipe_data_sequence(pipe, pkt->sequence);
516 pkt->sequence = -1; /* -1 sequence will be ignored */
517
518 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
519
520 ret = usbhsf_fifo_select(pipe, fifo, 1);
521 if (ret < 0)
522 return 0;
523
524 ret = usbhs_pipe_is_accessible(pipe);
525 if (ret < 0) {
526 /* inaccessible pipe is not an error */
527 ret = 0;
528 goto usbhs_fifo_write_busy;
529 }
530
531 ret = usbhsf_fifo_barrier(priv, fifo);
532 if (ret < 0)
533 goto usbhs_fifo_write_busy;
534
535 buf = pkt->buf + pkt->actual;
536 len = pkt->length - pkt->actual;
537 len = min(len, maxp);
538 total_len = len;
539 is_short = total_len < maxp;
540
541 /*
542 * FIXME
543 *
544 * 32-bit access only
545 */
546 if (len >= 4 && !((unsigned long)buf & 0x03)) {
547 iowrite32_rep(addr, buf, len / 4);
548 len %= 4;
549 buf += total_len - len;
550 }
551
552 /* the rest operation */
553 if (usbhs_get_dparam(priv, cfifo_byte_addr)) {
554 for (i = 0; i < len; i++)
555 iowrite8(buf[i], addr + (i & 0x03));
556 } else {
557 for (i = 0; i < len; i++)
558 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
559 }
560
561 /*
562 * variable update
563 */
564 pkt->actual += total_len;
565
566 if (pkt->actual < pkt->length)
567 *is_done = 0; /* there are remainder data */
568 else if (is_short)
569 *is_done = 1; /* short packet */
570 else
571 *is_done = !pkt->zero; /* send zero packet ? */
572
573 /*
574 * pipe/irq handling
575 */
576 if (is_short)
577 usbhsf_send_terminator(pipe, fifo);
578
579 usbhsf_tx_irq_ctrl(pipe, !*is_done);
580 usbhs_pipe_running(pipe, !*is_done);
581 usbhs_pipe_enable(pipe);
582
583 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
584 usbhs_pipe_number(pipe),
585 pkt->length, pkt->actual, *is_done, pkt->zero);
586
587 usbhsf_fifo_unselect(pipe, fifo);
588
589 return 0;
590
591usbhs_fifo_write_busy:
592 usbhsf_fifo_unselect(pipe, fifo);
593
594 /*
595 * pipe is busy.
596 * retry in interrupt
597 */
598 usbhsf_tx_irq_ctrl(pipe, 1);
599 usbhs_pipe_running(pipe, 1);
600
601 return ret;
602}
603
604static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
605{
606 if (usbhs_pipe_is_running(pkt->pipe))
607 return 0;
608
609 return usbhsf_pio_try_push(pkt, is_done);
610}
611
612const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
613 .prepare = usbhsf_pio_prepare_push,
614 .try_run = usbhsf_pio_try_push,
615};
616
617/*
618 * PIO pop handler
619 */
620static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
621{
622 struct usbhs_pipe *pipe = pkt->pipe;
623 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
624 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
625
626 if (usbhs_pipe_is_busy(pipe))
627 return 0;
628
629 if (usbhs_pipe_is_running(pipe))
630 return 0;
631
632 /*
633 * pipe enable to prepare packet receive
634 */
635 usbhs_pipe_data_sequence(pipe, pkt->sequence);
636 pkt->sequence = -1; /* -1 sequence will be ignored */
637
638 if (usbhs_pipe_is_dcp(pipe))
639 usbhsf_fifo_clear(pipe, fifo);
640
641 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
642 usbhs_pipe_enable(pipe);
643 usbhs_pipe_running(pipe, 1);
644 usbhsf_rx_irq_ctrl(pipe, 1);
645
646 return 0;
647}
648
649static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
650{
651 struct usbhs_pipe *pipe = pkt->pipe;
652 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
653 struct device *dev = usbhs_priv_to_dev(priv);
654 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
655 void __iomem *addr = priv->base + fifo->port;
656 u8 *buf;
657 u32 data = 0;
658 int maxp = usbhs_pipe_get_maxpacket(pipe);
659 int rcv_len, len;
660 int i, ret;
661 int total_len = 0;
662
663 ret = usbhsf_fifo_select(pipe, fifo, 0);
664 if (ret < 0)
665 return 0;
666
667 ret = usbhsf_fifo_barrier(priv, fifo);
668 if (ret < 0)
669 goto usbhs_fifo_read_busy;
670
671 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
672
673 buf = pkt->buf + pkt->actual;
674 len = pkt->length - pkt->actual;
675 len = min(len, rcv_len);
676 total_len = len;
677
678 /*
679 * update actual length first here to decide disable pipe.
680 * if this pipe keeps BUF status and all data were popped,
681 * then, next interrupt/token will be issued again
682 */
683 pkt->actual += total_len;
684
685 if ((pkt->actual == pkt->length) || /* receive all data */
686 (total_len < maxp)) { /* short packet */
687 *is_done = 1;
688 usbhsf_rx_irq_ctrl(pipe, 0);
689 usbhs_pipe_running(pipe, 0);
690 /*
691 * If function mode, since this controller is possible to enter
692 * Control Write status stage at this timing, this driver
693 * should not disable the pipe. If such a case happens, this
694 * controller is not able to complete the status stage.
695 */
696 if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
697 usbhs_pipe_disable(pipe); /* disable pipe first */
698 }
699
700 /*
701 * Buffer clear if Zero-Length packet
702 *
703 * see
704 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
705 */
706 if (0 == rcv_len) {
707 pkt->zero = 1;
708 usbhsf_fifo_clear(pipe, fifo);
709 goto usbhs_fifo_read_end;
710 }
711
712 /*
713 * FIXME
714 *
715 * 32-bit access only
716 */
717 if (len >= 4 && !((unsigned long)buf & 0x03)) {
718 ioread32_rep(addr, buf, len / 4);
719 len %= 4;
720 buf += total_len - len;
721 }
722
723 /* the rest operation */
724 for (i = 0; i < len; i++) {
725 if (!(i & 0x03))
726 data = ioread32(addr);
727
728 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
729 }
730
731usbhs_fifo_read_end:
732 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
733 usbhs_pipe_number(pipe),
734 pkt->length, pkt->actual, *is_done, pkt->zero);
735
736usbhs_fifo_read_busy:
737 usbhsf_fifo_unselect(pipe, fifo);
738
739 return ret;
740}
741
742const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
743 .prepare = usbhsf_prepare_pop,
744 .try_run = usbhsf_pio_try_pop,
745};
746
747/*
748 * DCP ctrol statge handler
749 */
750static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
751{
752 usbhs_dcp_control_transfer_done(pkt->pipe);
753
754 *is_done = 1;
755
756 return 0;
757}
758
759const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
760 .prepare = usbhsf_ctrl_stage_end,
761 .try_run = usbhsf_ctrl_stage_end,
762};
763
764/*
765 * DMA fifo functions
766 */
767static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
768 struct usbhs_pkt *pkt)
769{
770 if (&usbhs_fifo_dma_push_handler == pkt->handler)
771 return fifo->tx_chan;
772
773 if (&usbhs_fifo_dma_pop_handler == pkt->handler)
774 return fifo->rx_chan;
775
776 return NULL;
777}
778
779static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
780 struct usbhs_pkt *pkt)
781{
782 struct usbhs_fifo *fifo;
783 int i;
784
785 usbhs_for_each_dfifo(priv, fifo, i) {
786 if (usbhsf_dma_chan_get(fifo, pkt) &&
787 !usbhsf_fifo_is_busy(fifo))
788 return fifo;
789 }
790
791 return NULL;
792}
793
794#define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE)
795#define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0)
796static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
797 struct usbhs_fifo *fifo,
798 u16 dreqe)
799{
800 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
801
802 usbhs_bset(priv, fifo->sel, DREQE, dreqe);
803}
804
805static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
806{
807 struct usbhs_pipe *pipe = pkt->pipe;
808 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
809 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
810 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
811 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
812
813 return info->dma_map_ctrl(chan->device->dev, pkt, map);
814}
815
816static void usbhsf_dma_complete(void *arg,
817 const struct dmaengine_result *result);
818static void usbhsf_dma_xfer_preparing(struct usbhs_pkt *pkt)
819{
820 struct usbhs_pipe *pipe = pkt->pipe;
821 struct usbhs_fifo *fifo;
822 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
823 struct dma_async_tx_descriptor *desc;
824 struct dma_chan *chan;
825 struct device *dev = usbhs_priv_to_dev(priv);
826 enum dma_transfer_direction dir;
827 dma_cookie_t cookie;
828
829 fifo = usbhs_pipe_to_fifo(pipe);
830 if (!fifo)
831 return;
832
833 chan = usbhsf_dma_chan_get(fifo, pkt);
834 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
835
836 desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
837 pkt->trans, dir,
838 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
839 if (!desc)
840 return;
841
842 desc->callback_result = usbhsf_dma_complete;
843 desc->callback_param = pkt;
844
845 cookie = dmaengine_submit(desc);
846 if (cookie < 0) {
847 dev_err(dev, "Failed to submit dma descriptor\n");
848 return;
849 }
850
851 dev_dbg(dev, " %s %d (%d/ %d)\n",
852 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
853
854 usbhs_pipe_running(pipe, 1);
855 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
856 dma_async_issue_pending(chan);
857 usbhsf_dma_start(pipe, fifo);
858 usbhs_pipe_enable(pipe);
859}
860
861static void xfer_work(struct work_struct *work)
862{
863 struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
864 struct usbhs_pipe *pipe = pkt->pipe;
865 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
866 unsigned long flags;
867
868 usbhs_lock(priv, flags);
869 usbhsf_dma_xfer_preparing(pkt);
870 usbhs_unlock(priv, flags);
871}
872
873/*
874 * DMA push handler
875 */
876static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
877{
878 struct usbhs_pipe *pipe = pkt->pipe;
879 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
880 struct usbhs_fifo *fifo;
881 int len = pkt->length - pkt->actual;
882 int ret;
883 uintptr_t align_mask;
884
885 if (usbhs_pipe_is_busy(pipe))
886 return 0;
887
888 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
889 if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
890 usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
891 goto usbhsf_pio_prepare_push;
892
893 /* check data length if this driver don't use USB-DMAC */
894 if (!usbhs_get_dparam(priv, has_usb_dmac) && len & 0x7)
895 goto usbhsf_pio_prepare_push;
896
897 /* check buffer alignment */
898 align_mask = usbhs_get_dparam(priv, has_usb_dmac) ?
899 USBHS_USB_DMAC_XFER_SIZE - 1 : 0x7;
900 if ((uintptr_t)(pkt->buf + pkt->actual) & align_mask)
901 goto usbhsf_pio_prepare_push;
902
903 /* return at this time if the pipe is running */
904 if (usbhs_pipe_is_running(pipe))
905 return 0;
906
907 /* get enable DMA fifo */
908 fifo = usbhsf_get_dma_fifo(priv, pkt);
909 if (!fifo)
910 goto usbhsf_pio_prepare_push;
911
912 ret = usbhsf_fifo_select(pipe, fifo, 0);
913 if (ret < 0)
914 goto usbhsf_pio_prepare_push;
915
916 if (usbhsf_dma_map(pkt) < 0)
917 goto usbhsf_pio_prepare_push_unselect;
918
919 pkt->trans = len;
920
921 usbhsf_tx_irq_ctrl(pipe, 0);
922 /* FIXME: Workaound for usb dmac that driver can be used in atomic */
923 if (usbhs_get_dparam(priv, has_usb_dmac)) {
924 usbhsf_dma_xfer_preparing(pkt);
925 } else {
926 INIT_WORK(&pkt->work, xfer_work);
927 schedule_work(&pkt->work);
928 }
929
930 return 0;
931
932usbhsf_pio_prepare_push_unselect:
933 usbhsf_fifo_unselect(pipe, fifo);
934usbhsf_pio_prepare_push:
935 /*
936 * change handler to PIO
937 */
938 pkt->handler = &usbhs_fifo_pio_push_handler;
939
940 return pkt->handler->prepare(pkt, is_done);
941}
942
943static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
944{
945 struct usbhs_pipe *pipe = pkt->pipe;
946 int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
947
948 pkt->actual += pkt->trans;
949
950 if (pkt->actual < pkt->length)
951 *is_done = 0; /* there are remainder data */
952 else if (is_short)
953 *is_done = 1; /* short packet */
954 else
955 *is_done = !pkt->zero; /* send zero packet? */
956
957 usbhs_pipe_running(pipe, !*is_done);
958
959 usbhsf_dma_stop(pipe, pipe->fifo);
960 usbhsf_dma_unmap(pkt);
961 usbhsf_fifo_unselect(pipe, pipe->fifo);
962
963 if (!*is_done) {
964 /* change handler to PIO */
965 pkt->handler = &usbhs_fifo_pio_push_handler;
966 return pkt->handler->try_run(pkt, is_done);
967 }
968
969 return 0;
970}
971
972const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
973 .prepare = usbhsf_dma_prepare_push,
974 .dma_done = usbhsf_dma_push_done,
975};
976
977/*
978 * DMA pop handler
979 */
980
981static int usbhsf_dma_prepare_pop_with_rx_irq(struct usbhs_pkt *pkt,
982 int *is_done)
983{
984 return usbhsf_prepare_pop(pkt, is_done);
985}
986
987static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
988 int *is_done)
989{
990 struct usbhs_pipe *pipe = pkt->pipe;
991 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
992 struct usbhs_fifo *fifo;
993 int ret;
994
995 if (usbhs_pipe_is_busy(pipe))
996 return 0;
997
998 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
999 if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
1000 usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
1001 goto usbhsf_pio_prepare_pop;
1002
1003 fifo = usbhsf_get_dma_fifo(priv, pkt);
1004 if (!fifo)
1005 goto usbhsf_pio_prepare_pop;
1006
1007 if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
1008 goto usbhsf_pio_prepare_pop;
1009
1010 /* return at this time if the pipe is running */
1011 if (usbhs_pipe_is_running(pipe))
1012 return 0;
1013
1014 usbhs_pipe_config_change_bfre(pipe, 1);
1015
1016 ret = usbhsf_fifo_select(pipe, fifo, 0);
1017 if (ret < 0)
1018 goto usbhsf_pio_prepare_pop;
1019
1020 if (usbhsf_dma_map(pkt) < 0)
1021 goto usbhsf_pio_prepare_pop_unselect;
1022
1023 /* DMA */
1024
1025 /*
1026 * usbhs_fifo_dma_pop_handler :: prepare
1027 * enabled irq to come here.
1028 * but it is no longer needed for DMA. disable it.
1029 */
1030 usbhsf_rx_irq_ctrl(pipe, 0);
1031
1032 pkt->trans = pkt->length;
1033
1034 usbhsf_dma_xfer_preparing(pkt);
1035
1036 return 0;
1037
1038usbhsf_pio_prepare_pop_unselect:
1039 usbhsf_fifo_unselect(pipe, fifo);
1040usbhsf_pio_prepare_pop:
1041
1042 /*
1043 * change handler to PIO
1044 */
1045 pkt->handler = &usbhs_fifo_pio_pop_handler;
1046 usbhs_pipe_config_change_bfre(pipe, 0);
1047
1048 return pkt->handler->prepare(pkt, is_done);
1049}
1050
1051static int usbhsf_dma_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
1052{
1053 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1054
1055 if (usbhs_get_dparam(priv, has_usb_dmac))
1056 return usbhsf_dma_prepare_pop_with_usb_dmac(pkt, is_done);
1057 else
1058 return usbhsf_dma_prepare_pop_with_rx_irq(pkt, is_done);
1059}
1060
1061static int usbhsf_dma_try_pop_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1062{
1063 struct usbhs_pipe *pipe = pkt->pipe;
1064 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1065 struct usbhs_fifo *fifo;
1066 int len, ret;
1067
1068 if (usbhs_pipe_is_busy(pipe))
1069 return 0;
1070
1071 if (usbhs_pipe_is_dcp(pipe))
1072 goto usbhsf_pio_prepare_pop;
1073
1074 /* get enable DMA fifo */
1075 fifo = usbhsf_get_dma_fifo(priv, pkt);
1076 if (!fifo)
1077 goto usbhsf_pio_prepare_pop;
1078
1079 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
1080 goto usbhsf_pio_prepare_pop;
1081
1082 ret = usbhsf_fifo_select(pipe, fifo, 0);
1083 if (ret < 0)
1084 goto usbhsf_pio_prepare_pop;
1085
1086 /* use PIO if packet is less than pio_dma_border */
1087 len = usbhsf_fifo_rcv_len(priv, fifo);
1088 len = min(pkt->length - pkt->actual, len);
1089 if (len & 0x7) /* 8byte alignment */
1090 goto usbhsf_pio_prepare_pop_unselect;
1091
1092 if (len < usbhs_get_dparam(priv, pio_dma_border))
1093 goto usbhsf_pio_prepare_pop_unselect;
1094
1095 ret = usbhsf_fifo_barrier(priv, fifo);
1096 if (ret < 0)
1097 goto usbhsf_pio_prepare_pop_unselect;
1098
1099 if (usbhsf_dma_map(pkt) < 0)
1100 goto usbhsf_pio_prepare_pop_unselect;
1101
1102 /* DMA */
1103
1104 /*
1105 * usbhs_fifo_dma_pop_handler :: prepare
1106 * enabled irq to come here.
1107 * but it is no longer needed for DMA. disable it.
1108 */
1109 usbhsf_rx_irq_ctrl(pipe, 0);
1110
1111 pkt->trans = len;
1112
1113 INIT_WORK(&pkt->work, xfer_work);
1114 schedule_work(&pkt->work);
1115
1116 return 0;
1117
1118usbhsf_pio_prepare_pop_unselect:
1119 usbhsf_fifo_unselect(pipe, fifo);
1120usbhsf_pio_prepare_pop:
1121
1122 /*
1123 * change handler to PIO
1124 */
1125 pkt->handler = &usbhs_fifo_pio_pop_handler;
1126
1127 return pkt->handler->try_run(pkt, is_done);
1128}
1129
1130static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
1131{
1132 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1133
1134 BUG_ON(usbhs_get_dparam(priv, has_usb_dmac));
1135
1136 return usbhsf_dma_try_pop_with_rx_irq(pkt, is_done);
1137}
1138
1139static int usbhsf_dma_pop_done_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1140{
1141 struct usbhs_pipe *pipe = pkt->pipe;
1142 int maxp = usbhs_pipe_get_maxpacket(pipe);
1143
1144 usbhsf_dma_stop(pipe, pipe->fifo);
1145 usbhsf_dma_unmap(pkt);
1146 usbhsf_fifo_unselect(pipe, pipe->fifo);
1147
1148 pkt->actual += pkt->trans;
1149
1150 if ((pkt->actual == pkt->length) || /* receive all data */
1151 (pkt->trans < maxp)) { /* short packet */
1152 *is_done = 1;
1153 usbhs_pipe_running(pipe, 0);
1154 } else {
1155 /* re-enable */
1156 usbhs_pipe_running(pipe, 0);
1157 usbhsf_prepare_pop(pkt, is_done);
1158 }
1159
1160 return 0;
1161}
1162
1163static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
1164 struct dma_chan *chan, int dtln)
1165{
1166 struct usbhs_pipe *pipe = pkt->pipe;
1167 size_t received_size;
1168 int maxp = usbhs_pipe_get_maxpacket(pipe);
1169
1170 received_size = pkt->length - pkt->dma_result->residue;
1171
1172 if (dtln) {
1173 received_size -= USBHS_USB_DMAC_XFER_SIZE;
1174 received_size &= ~(maxp - 1);
1175 received_size += dtln;
1176 }
1177
1178 return received_size;
1179}
1180
1181static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
1182 int *is_done)
1183{
1184 struct usbhs_pipe *pipe = pkt->pipe;
1185 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1186 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
1187 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
1188 int rcv_len;
1189
1190 /*
1191 * Since the driver disables rx_irq in DMA mode, the interrupt handler
1192 * cannot the BRDYSTS. So, the function clears it here because the
1193 * driver may use PIO mode next time.
1194 */
1195 usbhs_xxxsts_clear(priv, BRDYSTS, usbhs_pipe_number(pipe));
1196
1197 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
1198 usbhsf_fifo_clear(pipe, fifo);
1199 pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
1200
1201 usbhs_pipe_running(pipe, 0);
1202 usbhsf_dma_stop(pipe, fifo);
1203 usbhsf_dma_unmap(pkt);
1204 usbhsf_fifo_unselect(pipe, pipe->fifo);
1205
1206 /* The driver can assume the rx transaction is always "done" */
1207 *is_done = 1;
1208
1209 return 0;
1210}
1211
1212static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
1213{
1214 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1215
1216 if (usbhs_get_dparam(priv, has_usb_dmac))
1217 return usbhsf_dma_pop_done_with_usb_dmac(pkt, is_done);
1218 else
1219 return usbhsf_dma_pop_done_with_rx_irq(pkt, is_done);
1220}
1221
1222const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
1223 .prepare = usbhsf_dma_prepare_pop,
1224 .try_run = usbhsf_dma_try_pop,
1225 .dma_done = usbhsf_dma_pop_done
1226};
1227
1228/*
1229 * DMA setting
1230 */
1231static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
1232{
1233 struct sh_dmae_slave *slave = param;
1234
1235 /*
1236 * FIXME
1237 *
1238 * usbhs doesn't recognize id = 0 as valid DMA
1239 */
1240 if (0 == slave->shdma_slave.slave_id)
1241 return false;
1242
1243 chan->private = slave;
1244
1245 return true;
1246}
1247
1248static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1249{
1250 if (fifo->tx_chan)
1251 dma_release_channel(fifo->tx_chan);
1252 if (fifo->rx_chan)
1253 dma_release_channel(fifo->rx_chan);
1254
1255 fifo->tx_chan = NULL;
1256 fifo->rx_chan = NULL;
1257}
1258
1259static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
1260{
1261 dma_cap_mask_t mask;
1262
1263 dma_cap_zero(mask);
1264 dma_cap_set(DMA_SLAVE, mask);
1265 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1266 &fifo->tx_slave);
1267
1268 dma_cap_zero(mask);
1269 dma_cap_set(DMA_SLAVE, mask);
1270 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1271 &fifo->rx_slave);
1272}
1273
1274static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
1275 int channel)
1276{
1277 char name[16];
1278
1279 /*
1280 * To avoid complex handing for DnFIFOs, the driver uses each
1281 * DnFIFO as TX or RX direction (not bi-direction).
1282 * So, the driver uses odd channels for TX, even channels for RX.
1283 */
1284 snprintf(name, sizeof(name), "ch%d", channel);
1285 if (channel & 1) {
1286 fifo->tx_chan = dma_request_chan(dev, name);
1287 if (IS_ERR(fifo->tx_chan))
1288 fifo->tx_chan = NULL;
1289 } else {
1290 fifo->rx_chan = dma_request_chan(dev, name);
1291 if (IS_ERR(fifo->rx_chan))
1292 fifo->rx_chan = NULL;
1293 }
1294}
1295
1296static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
1297 int channel)
1298{
1299 struct device *dev = usbhs_priv_to_dev(priv);
1300
1301 if (dev_of_node(dev))
1302 usbhsf_dma_init_dt(dev, fifo, channel);
1303 else
1304 usbhsf_dma_init_pdev(fifo);
1305
1306 if (fifo->tx_chan || fifo->rx_chan)
1307 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1308 fifo->name,
1309 fifo->tx_chan ? "[TX]" : " ",
1310 fifo->rx_chan ? "[RX]" : " ");
1311}
1312
1313/*
1314 * irq functions
1315 */
1316static int usbhsf_irq_empty(struct usbhs_priv *priv,
1317 struct usbhs_irq_state *irq_state)
1318{
1319 struct usbhs_pipe *pipe;
1320 struct device *dev = usbhs_priv_to_dev(priv);
1321 int i, ret;
1322
1323 if (!irq_state->bempsts) {
1324 dev_err(dev, "debug %s !!\n", __func__);
1325 return -EIO;
1326 }
1327
1328 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1329
1330 /*
1331 * search interrupted "pipe"
1332 * not "uep".
1333 */
1334 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1335 if (!(irq_state->bempsts & (1 << i)))
1336 continue;
1337
1338 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1339 if (ret < 0)
1340 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1341 }
1342
1343 return 0;
1344}
1345
1346static int usbhsf_irq_ready(struct usbhs_priv *priv,
1347 struct usbhs_irq_state *irq_state)
1348{
1349 struct usbhs_pipe *pipe;
1350 struct device *dev = usbhs_priv_to_dev(priv);
1351 int i, ret;
1352
1353 if (!irq_state->brdysts) {
1354 dev_err(dev, "debug %s !!\n", __func__);
1355 return -EIO;
1356 }
1357
1358 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1359
1360 /*
1361 * search interrupted "pipe"
1362 * not "uep".
1363 */
1364 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1365 if (!(irq_state->brdysts & (1 << i)))
1366 continue;
1367
1368 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1369 if (ret < 0)
1370 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1371 }
1372
1373 return 0;
1374}
1375
1376static void usbhsf_dma_complete(void *arg,
1377 const struct dmaengine_result *result)
1378{
1379 struct usbhs_pkt *pkt = arg;
1380 struct usbhs_pipe *pipe = pkt->pipe;
1381 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1382 struct device *dev = usbhs_priv_to_dev(priv);
1383 int ret;
1384
1385 pkt->dma_result = result;
1386 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1387 if (ret < 0)
1388 dev_err(dev, "dma_complete run_error %d : %d\n",
1389 usbhs_pipe_number(pipe), ret);
1390}
1391
1392void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe)
1393{
1394 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1395 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
1396
1397 /* clear DCP FIFO of transmission */
1398 if (usbhsf_fifo_select(pipe, fifo, 1) < 0)
1399 return;
1400 usbhsf_fifo_clear(pipe, fifo);
1401 usbhsf_fifo_unselect(pipe, fifo);
1402
1403 /* clear DCP FIFO of reception */
1404 if (usbhsf_fifo_select(pipe, fifo, 0) < 0)
1405 return;
1406 usbhsf_fifo_clear(pipe, fifo);
1407 usbhsf_fifo_unselect(pipe, fifo);
1408}
1409
1410/*
1411 * fifo init
1412 */
1413void usbhs_fifo_init(struct usbhs_priv *priv)
1414{
1415 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1416 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1417 struct usbhs_fifo *dfifo;
1418 int i;
1419
1420 mod->irq_empty = usbhsf_irq_empty;
1421 mod->irq_ready = usbhsf_irq_ready;
1422 mod->irq_bempsts = 0;
1423 mod->irq_brdysts = 0;
1424
1425 cfifo->pipe = NULL;
1426 usbhs_for_each_dfifo(priv, dfifo, i)
1427 dfifo->pipe = NULL;
1428}
1429
1430void usbhs_fifo_quit(struct usbhs_priv *priv)
1431{
1432 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1433
1434 mod->irq_empty = NULL;
1435 mod->irq_ready = NULL;
1436 mod->irq_bempsts = 0;
1437 mod->irq_brdysts = 0;
1438}
1439
1440#define __USBHS_DFIFO_INIT(priv, fifo, channel, fifo_port) \
1441do { \
1442 fifo = usbhsf_get_dnfifo(priv, channel); \
1443 fifo->name = "D"#channel"FIFO"; \
1444 fifo->port = fifo_port; \
1445 fifo->sel = D##channel##FIFOSEL; \
1446 fifo->ctr = D##channel##FIFOCTR; \
1447 fifo->tx_slave.shdma_slave.slave_id = \
1448 usbhs_get_dparam(priv, d##channel##_tx_id); \
1449 fifo->rx_slave.shdma_slave.slave_id = \
1450 usbhs_get_dparam(priv, d##channel##_rx_id); \
1451 usbhsf_dma_init(priv, fifo, channel); \
1452} while (0)
1453
1454#define USBHS_DFIFO_INIT(priv, fifo, channel) \
1455 __USBHS_DFIFO_INIT(priv, fifo, channel, D##channel##FIFO)
1456#define USBHS_DFIFO_INIT_NO_PORT(priv, fifo, channel) \
1457 __USBHS_DFIFO_INIT(priv, fifo, channel, 0)
1458
1459int usbhs_fifo_probe(struct usbhs_priv *priv)
1460{
1461 struct usbhs_fifo *fifo;
1462
1463 /* CFIFO */
1464 fifo = usbhsf_get_cfifo(priv);
1465 fifo->name = "CFIFO";
1466 fifo->port = CFIFO;
1467 fifo->sel = CFIFOSEL;
1468 fifo->ctr = CFIFOCTR;
1469
1470 /* DFIFO */
1471 USBHS_DFIFO_INIT(priv, fifo, 0);
1472 USBHS_DFIFO_INIT(priv, fifo, 1);
1473 USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 2);
1474 USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 3);
1475
1476 return 0;
1477}
1478
1479void usbhs_fifo_remove(struct usbhs_priv *priv)
1480{
1481 struct usbhs_fifo *fifo;
1482 int i;
1483
1484 usbhs_for_each_dfifo(priv, fifo, i)
1485 usbhsf_dma_quit(priv, fifo);
1486}