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