1 // SPDX-License-Identifier: GPL-1.0+
5 * Copyright (C) 2011 Renesas Solutions Corp.
8 #include <linux/delay.h>
10 #include <linux/scatterlist.h>
14 #define usbhsf_get_cfifo(p) (&((p)->fifo_info.cfifo))
15 #define usbhsf_is_cfifo(p, f) (usbhsf_get_cfifo(p) == f)
17 #define usbhsf_fifo_is_busy(f) ((f)->pipe) /* see usbhs_pipe_select_fifo */
22 void usbhs_pkt_init(struct usbhs_pkt *pkt)
24 INIT_LIST_HEAD(&pkt->node);
28 * packet control function
30 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
32 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
33 struct device *dev = usbhs_priv_to_dev(priv);
35 dev_err(dev, "null handler\n");
40 static const struct usbhs_pkt_handle usbhsf_null_handler = {
41 .prepare = usbhsf_null_handle,
42 .try_run = usbhsf_null_handle,
45 void 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)
50 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
51 struct device *dev = usbhs_priv_to_dev(priv);
55 dev_err(dev, "no done function\n");
59 /******************** spin lock ********************/
60 usbhs_lock(priv, flags);
63 dev_err(dev, "no handler function\n");
64 pipe->handler = &usbhsf_null_handler;
67 list_move_tail(&pkt->node, &pipe->list);
70 * each pkt must hold own handler.
71 * because handler might be changed by its situation.
72 * dma handler -> pio handler.
76 pkt->handler = pipe->handler;
81 pkt->sequence = sequence;
83 usbhs_unlock(priv, flags);
84 /******************** spin unlock ******************/
87 static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
89 list_del_init(&pkt->node);
92 static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
94 return list_first_entry_or_null(&pipe->list, struct usbhs_pkt, node);
97 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
98 struct usbhs_fifo *fifo);
99 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
100 struct usbhs_fifo *fifo);
101 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
102 struct usbhs_pkt *pkt);
103 #define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1)
104 #define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
105 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map);
106 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
108 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
109 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
112 /******************** spin lock ********************/
113 usbhs_lock(priv, flags);
115 usbhs_pipe_disable(pipe);
118 pkt = __usbhsf_pkt_get(pipe);
121 struct dma_chan *chan = NULL;
124 chan = usbhsf_dma_chan_get(fifo, pkt);
126 dmaengine_terminate_all(chan);
127 usbhsf_fifo_clear(pipe, fifo);
128 usbhsf_dma_unmap(pkt);
131 __usbhsf_pkt_del(pkt);
135 usbhsf_fifo_unselect(pipe, fifo);
137 usbhs_unlock(priv, flags);
138 /******************** spin unlock ******************/
149 static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
151 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
152 struct usbhs_pkt *pkt;
153 struct device *dev = usbhs_priv_to_dev(priv);
154 int (*func)(struct usbhs_pkt *pkt, int *is_done);
159 /******************** spin lock ********************/
160 usbhs_lock(priv, flags);
162 pkt = __usbhsf_pkt_get(pipe);
164 goto __usbhs_pkt_handler_end;
167 case USBHSF_PKT_PREPARE:
168 func = pkt->handler->prepare;
170 case USBHSF_PKT_TRY_RUN:
171 func = pkt->handler->try_run;
173 case USBHSF_PKT_DMA_DONE:
174 func = pkt->handler->dma_done;
177 dev_err(dev, "unknown pkt handler\n");
178 goto __usbhs_pkt_handler_end;
182 ret = func(pkt, &is_done);
185 __usbhsf_pkt_del(pkt);
187 __usbhs_pkt_handler_end:
188 usbhs_unlock(priv, flags);
189 /******************** spin unlock ******************/
192 pkt->done(priv, pkt);
193 usbhs_pkt_start(pipe);
199 void usbhs_pkt_start(struct usbhs_pipe *pipe)
201 usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
205 * irq enable/disable function
207 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
208 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
209 #define usbhsf_irq_callback_ctrl(pipe, status, enable) \
211 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); \
212 struct usbhs_mod *mod = usbhs_mod_get_current(priv); \
213 u16 status = (1 << usbhs_pipe_number(pipe)); \
217 mod->status |= status; \
219 mod->status &= ~status; \
220 usbhs_irq_callback_update(priv, mod); \
223 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
226 * And DCP pipe can NOT use "ready interrupt" for "send"
227 * it should use "empty" interrupt.
229 * "Operation" - "Interrupt Function" - "BRDY Interrupt"
231 * on the other hand, normal pipe can use "ready interrupt" for "send"
232 * even though it is single/double buffer
234 if (usbhs_pipe_is_dcp(pipe))
235 usbhsf_irq_empty_ctrl(pipe, enable);
237 usbhsf_irq_ready_ctrl(pipe, enable);
240 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
242 usbhsf_irq_ready_ctrl(pipe, enable);
248 static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
249 struct usbhs_fifo *fifo)
251 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
253 usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
256 static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
257 struct usbhs_fifo *fifo)
262 /* The FIFO port is accessible */
263 if (usbhs_read(priv, fifo->ctr) & FRDY)
272 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
273 struct usbhs_fifo *fifo)
275 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
278 if (!usbhs_pipe_is_dcp(pipe)) {
280 * This driver checks the pipe condition first to avoid -EBUSY
281 * from usbhsf_fifo_barrier() with about 10 msec delay in
282 * the interrupt handler if the pipe is RX direction and empty.
284 if (usbhs_pipe_is_dir_in(pipe))
285 ret = usbhs_pipe_is_accessible(pipe);
287 ret = usbhsf_fifo_barrier(priv, fifo);
291 * if non-DCP pipe, this driver should set BCLR when
292 * usbhsf_fifo_barrier() returns 0.
295 usbhs_write(priv, fifo->ctr, BCLR);
298 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
299 struct usbhs_fifo *fifo)
301 return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
304 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
305 struct usbhs_fifo *fifo)
307 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
309 usbhs_pipe_select_fifo(pipe, NULL);
310 usbhs_write(priv, fifo->sel, 0);
313 static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
314 struct usbhs_fifo *fifo,
317 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
318 struct device *dev = usbhs_priv_to_dev(priv);
320 u16 mask = ((1 << 5) | 0xF); /* mask of ISEL | CURPIPE */
321 u16 base = usbhs_pipe_number(pipe); /* CURPIPE */
323 if (usbhs_pipe_is_busy(pipe) ||
324 usbhsf_fifo_is_busy(fifo))
327 if (usbhs_pipe_is_dcp(pipe)) {
328 base |= (1 == write) << 5; /* ISEL */
330 if (usbhs_mod_is_host(priv))
331 usbhs_dcp_dir_for_host(pipe, write);
334 /* "base" will be used below */
335 if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo))
336 usbhs_write(priv, fifo->sel, base);
338 usbhs_write(priv, fifo->sel, base | MBW_32);
340 /* check ISEL and CURPIPE value */
342 if (base == (mask & usbhs_read(priv, fifo->sel))) {
343 usbhs_pipe_select_fifo(pipe, fifo);
349 dev_err(dev, "fifo select error\n");
357 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
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);
365 usbhs_pipe_disable(pipe);
367 ret = usbhsf_fifo_select(pipe, fifo, 1);
369 dev_err(dev, "%s() faile\n", __func__);
373 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
375 usbhsf_fifo_clear(pipe, fifo);
376 usbhsf_send_terminator(pipe, fifo);
378 usbhsf_fifo_unselect(pipe, fifo);
380 usbhsf_tx_irq_ctrl(pipe, 1);
381 usbhs_pipe_enable(pipe);
386 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
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);
394 usbhs_pipe_disable(pipe);
396 ret = usbhsf_fifo_select(pipe, fifo, 0);
398 dev_err(dev, "%s() fail\n", __func__);
402 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
403 usbhsf_fifo_clear(pipe, fifo);
405 usbhsf_fifo_unselect(pipe, fifo);
407 usbhsf_rx_irq_ctrl(pipe, 1);
408 usbhs_pipe_enable(pipe);
414 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
416 struct usbhs_pipe *pipe = pkt->pipe;
418 if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
419 usbhsf_tx_irq_ctrl(pipe, 0);
421 usbhsf_rx_irq_ctrl(pipe, 0);
423 pkt->actual = pkt->length;
429 const 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,
434 const 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,
440 * DCP data stage (push)
442 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
444 struct usbhs_pipe *pipe = pkt->pipe;
446 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
449 * change handler to PIO push
451 pkt->handler = &usbhs_fifo_pio_push_handler;
453 return pkt->handler->prepare(pkt, is_done);
456 const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
457 .prepare = usbhsf_dcp_data_stage_try_push,
461 * DCP data stage (pop)
463 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
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);
470 if (usbhs_pipe_is_busy(pipe))
474 * prepare pop for DCP should
475 * - change DCP direction,
479 usbhs_pipe_disable(pipe);
481 usbhs_pipe_sequence_data1(pipe); /* DATA1 */
483 usbhsf_fifo_select(pipe, fifo, 0);
484 usbhsf_fifo_clear(pipe, fifo);
485 usbhsf_fifo_unselect(pipe, fifo);
488 * change handler to PIO pop
490 pkt->handler = &usbhs_fifo_pio_pop_handler;
492 return pkt->handler->prepare(pkt, is_done);
495 const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
496 .prepare = usbhsf_dcp_data_stage_prepare_pop,
502 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
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;
510 int maxp = usbhs_pipe_get_maxpacket(pipe);
515 usbhs_pipe_data_sequence(pipe, pkt->sequence);
516 pkt->sequence = -1; /* -1 sequence will be ignored */
518 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
520 ret = usbhsf_fifo_select(pipe, fifo, 1);
524 ret = usbhs_pipe_is_accessible(pipe);
526 /* inaccessible pipe is not an error */
528 goto usbhs_fifo_write_busy;
531 ret = usbhsf_fifo_barrier(priv, fifo);
533 goto usbhs_fifo_write_busy;
535 buf = pkt->buf + pkt->actual;
536 len = pkt->length - pkt->actual;
537 len = min(len, maxp);
539 is_short = total_len < maxp;
546 if (len >= 4 && !((unsigned long)buf & 0x03)) {
547 iowrite32_rep(addr, buf, len / 4);
549 buf += total_len - len;
552 /* the rest operation */
553 for (i = 0; i < len; i++)
554 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
559 pkt->actual += total_len;
561 if (pkt->actual < pkt->length)
562 *is_done = 0; /* there are remainder data */
564 *is_done = 1; /* short packet */
566 *is_done = !pkt->zero; /* send zero packet ? */
572 usbhsf_send_terminator(pipe, fifo);
574 usbhsf_tx_irq_ctrl(pipe, !*is_done);
575 usbhs_pipe_running(pipe, !*is_done);
576 usbhs_pipe_enable(pipe);
578 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
579 usbhs_pipe_number(pipe),
580 pkt->length, pkt->actual, *is_done, pkt->zero);
582 usbhsf_fifo_unselect(pipe, fifo);
586 usbhs_fifo_write_busy:
587 usbhsf_fifo_unselect(pipe, fifo);
593 usbhsf_tx_irq_ctrl(pipe, 1);
594 usbhs_pipe_running(pipe, 1);
599 static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
601 if (usbhs_pipe_is_running(pkt->pipe))
604 return usbhsf_pio_try_push(pkt, is_done);
607 const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
608 .prepare = usbhsf_pio_prepare_push,
609 .try_run = usbhsf_pio_try_push,
615 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
617 struct usbhs_pipe *pipe = pkt->pipe;
618 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
619 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
621 if (usbhs_pipe_is_busy(pipe))
624 if (usbhs_pipe_is_running(pipe))
628 * pipe enable to prepare packet receive
630 usbhs_pipe_data_sequence(pipe, pkt->sequence);
631 pkt->sequence = -1; /* -1 sequence will be ignored */
633 if (usbhs_pipe_is_dcp(pipe))
634 usbhsf_fifo_clear(pipe, fifo);
636 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
637 usbhs_pipe_enable(pipe);
638 usbhs_pipe_running(pipe, 1);
639 usbhsf_rx_irq_ctrl(pipe, 1);
644 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
646 struct usbhs_pipe *pipe = pkt->pipe;
647 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
648 struct device *dev = usbhs_priv_to_dev(priv);
649 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
650 void __iomem *addr = priv->base + fifo->port;
653 int maxp = usbhs_pipe_get_maxpacket(pipe);
658 ret = usbhsf_fifo_select(pipe, fifo, 0);
662 ret = usbhsf_fifo_barrier(priv, fifo);
664 goto usbhs_fifo_read_busy;
666 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
668 buf = pkt->buf + pkt->actual;
669 len = pkt->length - pkt->actual;
670 len = min(len, rcv_len);
674 * update actual length first here to decide disable pipe.
675 * if this pipe keeps BUF status and all data were popped,
676 * then, next interrupt/token will be issued again
678 pkt->actual += total_len;
680 if ((pkt->actual == pkt->length) || /* receive all data */
681 (total_len < maxp)) { /* short packet */
683 usbhsf_rx_irq_ctrl(pipe, 0);
684 usbhs_pipe_running(pipe, 0);
686 * If function mode, since this controller is possible to enter
687 * Control Write status stage at this timing, this driver
688 * should not disable the pipe. If such a case happens, this
689 * controller is not able to complete the status stage.
691 if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
692 usbhs_pipe_disable(pipe); /* disable pipe first */
696 * Buffer clear if Zero-Length packet
699 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
703 usbhsf_fifo_clear(pipe, fifo);
704 goto usbhs_fifo_read_end;
712 if (len >= 4 && !((unsigned long)buf & 0x03)) {
713 ioread32_rep(addr, buf, len / 4);
715 buf += total_len - len;
718 /* the rest operation */
719 for (i = 0; i < len; i++) {
721 data = ioread32(addr);
723 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
727 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
728 usbhs_pipe_number(pipe),
729 pkt->length, pkt->actual, *is_done, pkt->zero);
731 usbhs_fifo_read_busy:
732 usbhsf_fifo_unselect(pipe, fifo);
737 const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
738 .prepare = usbhsf_prepare_pop,
739 .try_run = usbhsf_pio_try_pop,
743 * DCP ctrol statge handler
745 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
747 usbhs_dcp_control_transfer_done(pkt->pipe);
754 const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
755 .prepare = usbhsf_ctrl_stage_end,
756 .try_run = usbhsf_ctrl_stage_end,
762 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
763 struct usbhs_pkt *pkt)
765 if (&usbhs_fifo_dma_push_handler == pkt->handler)
766 return fifo->tx_chan;
768 if (&usbhs_fifo_dma_pop_handler == pkt->handler)
769 return fifo->rx_chan;
774 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
775 struct usbhs_pkt *pkt)
777 struct usbhs_fifo *fifo;
780 usbhs_for_each_dfifo(priv, fifo, i) {
781 if (usbhsf_dma_chan_get(fifo, pkt) &&
782 !usbhsf_fifo_is_busy(fifo))
789 #define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE)
790 #define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0)
791 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
792 struct usbhs_fifo *fifo,
795 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
797 usbhs_bset(priv, fifo->sel, DREQE, dreqe);
800 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
802 struct usbhs_pipe *pipe = pkt->pipe;
803 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
804 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
805 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
806 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
808 return info->dma_map_ctrl(chan->device->dev, pkt, map);
811 static void usbhsf_dma_complete(void *arg);
812 static void xfer_work(struct work_struct *work)
814 struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
815 struct usbhs_pipe *pipe = pkt->pipe;
816 struct usbhs_fifo *fifo;
817 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
818 struct dma_async_tx_descriptor *desc;
819 struct dma_chan *chan;
820 struct device *dev = usbhs_priv_to_dev(priv);
821 enum dma_transfer_direction dir;
824 usbhs_lock(priv, flags);
825 fifo = usbhs_pipe_to_fifo(pipe);
829 chan = usbhsf_dma_chan_get(fifo, pkt);
830 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
832 desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
834 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
838 desc->callback = usbhsf_dma_complete;
839 desc->callback_param = pipe;
841 pkt->cookie = dmaengine_submit(desc);
842 if (pkt->cookie < 0) {
843 dev_err(dev, "Failed to submit dma descriptor\n");
847 dev_dbg(dev, " %s %d (%d/ %d)\n",
848 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
850 usbhs_pipe_running(pipe, 1);
851 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
852 dma_async_issue_pending(chan);
853 usbhsf_dma_start(pipe, fifo);
854 usbhs_pipe_enable(pipe);
857 usbhs_unlock(priv, flags);
863 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
865 struct usbhs_pipe *pipe = pkt->pipe;
866 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
867 struct usbhs_fifo *fifo;
868 int len = pkt->length - pkt->actual;
870 uintptr_t align_mask;
872 if (usbhs_pipe_is_busy(pipe))
875 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
876 if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
877 usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
878 goto usbhsf_pio_prepare_push;
880 /* check data length if this driver don't use USB-DMAC */
881 if (!usbhs_get_dparam(priv, has_usb_dmac) && len & 0x7)
882 goto usbhsf_pio_prepare_push;
884 /* check buffer alignment */
885 align_mask = usbhs_get_dparam(priv, has_usb_dmac) ?
886 USBHS_USB_DMAC_XFER_SIZE - 1 : 0x7;
887 if ((uintptr_t)(pkt->buf + pkt->actual) & align_mask)
888 goto usbhsf_pio_prepare_push;
890 /* return at this time if the pipe is running */
891 if (usbhs_pipe_is_running(pipe))
894 /* get enable DMA fifo */
895 fifo = usbhsf_get_dma_fifo(priv, pkt);
897 goto usbhsf_pio_prepare_push;
899 ret = usbhsf_fifo_select(pipe, fifo, 0);
901 goto usbhsf_pio_prepare_push;
903 if (usbhsf_dma_map(pkt) < 0)
904 goto usbhsf_pio_prepare_push_unselect;
908 usbhsf_tx_irq_ctrl(pipe, 0);
909 INIT_WORK(&pkt->work, xfer_work);
910 schedule_work(&pkt->work);
914 usbhsf_pio_prepare_push_unselect:
915 usbhsf_fifo_unselect(pipe, fifo);
916 usbhsf_pio_prepare_push:
918 * change handler to PIO
920 pkt->handler = &usbhs_fifo_pio_push_handler;
922 return pkt->handler->prepare(pkt, is_done);
925 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
927 struct usbhs_pipe *pipe = pkt->pipe;
928 int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
930 pkt->actual += pkt->trans;
932 if (pkt->actual < pkt->length)
933 *is_done = 0; /* there are remainder data */
935 *is_done = 1; /* short packet */
937 *is_done = !pkt->zero; /* send zero packet? */
939 usbhs_pipe_running(pipe, !*is_done);
941 usbhsf_dma_stop(pipe, pipe->fifo);
942 usbhsf_dma_unmap(pkt);
943 usbhsf_fifo_unselect(pipe, pipe->fifo);
946 /* change handler to PIO */
947 pkt->handler = &usbhs_fifo_pio_push_handler;
948 return pkt->handler->try_run(pkt, is_done);
954 const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
955 .prepare = usbhsf_dma_prepare_push,
956 .dma_done = usbhsf_dma_push_done,
963 static int usbhsf_dma_prepare_pop_with_rx_irq(struct usbhs_pkt *pkt,
966 return usbhsf_prepare_pop(pkt, is_done);
969 static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
972 struct usbhs_pipe *pipe = pkt->pipe;
973 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
974 struct usbhs_fifo *fifo;
977 if (usbhs_pipe_is_busy(pipe))
980 /* use PIO if packet is less than pio_dma_border or pipe is DCP */
981 if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
982 usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
983 goto usbhsf_pio_prepare_pop;
985 fifo = usbhsf_get_dma_fifo(priv, pkt);
987 goto usbhsf_pio_prepare_pop;
989 if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
990 goto usbhsf_pio_prepare_pop;
992 usbhs_pipe_config_change_bfre(pipe, 1);
994 ret = usbhsf_fifo_select(pipe, fifo, 0);
996 goto usbhsf_pio_prepare_pop;
998 if (usbhsf_dma_map(pkt) < 0)
999 goto usbhsf_pio_prepare_pop_unselect;
1004 * usbhs_fifo_dma_pop_handler :: prepare
1005 * enabled irq to come here.
1006 * but it is no longer needed for DMA. disable it.
1008 usbhsf_rx_irq_ctrl(pipe, 0);
1010 pkt->trans = pkt->length;
1012 INIT_WORK(&pkt->work, xfer_work);
1013 schedule_work(&pkt->work);
1017 usbhsf_pio_prepare_pop_unselect:
1018 usbhsf_fifo_unselect(pipe, fifo);
1019 usbhsf_pio_prepare_pop:
1022 * change handler to PIO
1024 pkt->handler = &usbhs_fifo_pio_pop_handler;
1025 usbhs_pipe_config_change_bfre(pipe, 0);
1027 return pkt->handler->prepare(pkt, is_done);
1030 static int usbhsf_dma_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
1032 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1034 if (usbhs_get_dparam(priv, has_usb_dmac))
1035 return usbhsf_dma_prepare_pop_with_usb_dmac(pkt, is_done);
1037 return usbhsf_dma_prepare_pop_with_rx_irq(pkt, is_done);
1040 static int usbhsf_dma_try_pop_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1042 struct usbhs_pipe *pipe = pkt->pipe;
1043 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1044 struct usbhs_fifo *fifo;
1047 if (usbhs_pipe_is_busy(pipe))
1050 if (usbhs_pipe_is_dcp(pipe))
1051 goto usbhsf_pio_prepare_pop;
1053 /* get enable DMA fifo */
1054 fifo = usbhsf_get_dma_fifo(priv, pkt);
1056 goto usbhsf_pio_prepare_pop;
1058 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
1059 goto usbhsf_pio_prepare_pop;
1061 ret = usbhsf_fifo_select(pipe, fifo, 0);
1063 goto usbhsf_pio_prepare_pop;
1065 /* use PIO if packet is less than pio_dma_border */
1066 len = usbhsf_fifo_rcv_len(priv, fifo);
1067 len = min(pkt->length - pkt->actual, len);
1068 if (len & 0x7) /* 8byte alignment */
1069 goto usbhsf_pio_prepare_pop_unselect;
1071 if (len < usbhs_get_dparam(priv, pio_dma_border))
1072 goto usbhsf_pio_prepare_pop_unselect;
1074 ret = usbhsf_fifo_barrier(priv, fifo);
1076 goto usbhsf_pio_prepare_pop_unselect;
1078 if (usbhsf_dma_map(pkt) < 0)
1079 goto usbhsf_pio_prepare_pop_unselect;
1084 * usbhs_fifo_dma_pop_handler :: prepare
1085 * enabled irq to come here.
1086 * but it is no longer needed for DMA. disable it.
1088 usbhsf_rx_irq_ctrl(pipe, 0);
1092 INIT_WORK(&pkt->work, xfer_work);
1093 schedule_work(&pkt->work);
1097 usbhsf_pio_prepare_pop_unselect:
1098 usbhsf_fifo_unselect(pipe, fifo);
1099 usbhsf_pio_prepare_pop:
1102 * change handler to PIO
1104 pkt->handler = &usbhs_fifo_pio_pop_handler;
1106 return pkt->handler->try_run(pkt, is_done);
1109 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
1111 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1113 BUG_ON(usbhs_get_dparam(priv, has_usb_dmac));
1115 return usbhsf_dma_try_pop_with_rx_irq(pkt, is_done);
1118 static int usbhsf_dma_pop_done_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1120 struct usbhs_pipe *pipe = pkt->pipe;
1121 int maxp = usbhs_pipe_get_maxpacket(pipe);
1123 usbhsf_dma_stop(pipe, pipe->fifo);
1124 usbhsf_dma_unmap(pkt);
1125 usbhsf_fifo_unselect(pipe, pipe->fifo);
1127 pkt->actual += pkt->trans;
1129 if ((pkt->actual == pkt->length) || /* receive all data */
1130 (pkt->trans < maxp)) { /* short packet */
1132 usbhs_pipe_running(pipe, 0);
1135 usbhs_pipe_running(pipe, 0);
1136 usbhsf_prepare_pop(pkt, is_done);
1142 static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
1143 struct dma_chan *chan, int dtln)
1145 struct usbhs_pipe *pipe = pkt->pipe;
1146 struct dma_tx_state state;
1147 size_t received_size;
1148 int maxp = usbhs_pipe_get_maxpacket(pipe);
1150 dmaengine_tx_status(chan, pkt->cookie, &state);
1151 received_size = pkt->length - state.residue;
1154 received_size -= USBHS_USB_DMAC_XFER_SIZE;
1155 received_size &= ~(maxp - 1);
1156 received_size += dtln;
1159 return received_size;
1162 static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
1165 struct usbhs_pipe *pipe = pkt->pipe;
1166 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1167 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
1168 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
1172 * Since the driver disables rx_irq in DMA mode, the interrupt handler
1173 * cannot the BRDYSTS. So, the function clears it here because the
1174 * driver may use PIO mode next time.
1176 usbhs_xxxsts_clear(priv, BRDYSTS, usbhs_pipe_number(pipe));
1178 rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
1179 usbhsf_fifo_clear(pipe, fifo);
1180 pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
1182 usbhsf_dma_stop(pipe, fifo);
1183 usbhsf_dma_unmap(pkt);
1184 usbhsf_fifo_unselect(pipe, pipe->fifo);
1186 /* The driver can assume the rx transaction is always "done" */
1192 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
1194 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1196 if (usbhs_get_dparam(priv, has_usb_dmac))
1197 return usbhsf_dma_pop_done_with_usb_dmac(pkt, is_done);
1199 return usbhsf_dma_pop_done_with_rx_irq(pkt, is_done);
1202 const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
1203 .prepare = usbhsf_dma_prepare_pop,
1204 .try_run = usbhsf_dma_try_pop,
1205 .dma_done = usbhsf_dma_pop_done
1211 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
1213 struct sh_dmae_slave *slave = param;
1218 * usbhs doesn't recognize id = 0 as valid DMA
1220 if (0 == slave->shdma_slave.slave_id)
1223 chan->private = slave;
1228 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1231 dma_release_channel(fifo->tx_chan);
1233 dma_release_channel(fifo->rx_chan);
1235 fifo->tx_chan = NULL;
1236 fifo->rx_chan = NULL;
1239 static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
1241 dma_cap_mask_t mask;
1244 dma_cap_set(DMA_SLAVE, mask);
1245 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1249 dma_cap_set(DMA_SLAVE, mask);
1250 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1254 static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
1260 * To avoid complex handing for DnFIFOs, the driver uses each
1261 * DnFIFO as TX or RX direction (not bi-direction).
1262 * So, the driver uses odd channels for TX, even channels for RX.
1264 snprintf(name, sizeof(name), "ch%d", channel);
1266 fifo->tx_chan = dma_request_slave_channel_reason(dev, name);
1267 if (IS_ERR(fifo->tx_chan))
1268 fifo->tx_chan = NULL;
1270 fifo->rx_chan = dma_request_slave_channel_reason(dev, name);
1271 if (IS_ERR(fifo->rx_chan))
1272 fifo->rx_chan = NULL;
1276 static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
1279 struct device *dev = usbhs_priv_to_dev(priv);
1282 usbhsf_dma_init_dt(dev, fifo, channel);
1284 usbhsf_dma_init_pdev(fifo);
1286 if (fifo->tx_chan || fifo->rx_chan)
1287 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1289 fifo->tx_chan ? "[TX]" : " ",
1290 fifo->rx_chan ? "[RX]" : " ");
1296 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1297 struct usbhs_irq_state *irq_state)
1299 struct usbhs_pipe *pipe;
1300 struct device *dev = usbhs_priv_to_dev(priv);
1303 if (!irq_state->bempsts) {
1304 dev_err(dev, "debug %s !!\n", __func__);
1308 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1311 * search interrupted "pipe"
1314 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1315 if (!(irq_state->bempsts & (1 << i)))
1318 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1320 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1326 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1327 struct usbhs_irq_state *irq_state)
1329 struct usbhs_pipe *pipe;
1330 struct device *dev = usbhs_priv_to_dev(priv);
1333 if (!irq_state->brdysts) {
1334 dev_err(dev, "debug %s !!\n", __func__);
1338 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1341 * search interrupted "pipe"
1344 usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1345 if (!(irq_state->brdysts & (1 << i)))
1348 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1350 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1356 static void usbhsf_dma_complete(void *arg)
1358 struct usbhs_pipe *pipe = arg;
1359 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1360 struct device *dev = usbhs_priv_to_dev(priv);
1363 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1365 dev_err(dev, "dma_complete run_error %d : %d\n",
1366 usbhs_pipe_number(pipe), ret);
1369 void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe)
1371 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1372 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
1374 /* clear DCP FIFO of transmission */
1375 if (usbhsf_fifo_select(pipe, fifo, 1) < 0)
1377 usbhsf_fifo_clear(pipe, fifo);
1378 usbhsf_fifo_unselect(pipe, fifo);
1380 /* clear DCP FIFO of reception */
1381 if (usbhsf_fifo_select(pipe, fifo, 0) < 0)
1383 usbhsf_fifo_clear(pipe, fifo);
1384 usbhsf_fifo_unselect(pipe, fifo);
1390 void usbhs_fifo_init(struct usbhs_priv *priv)
1392 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1393 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1394 struct usbhs_fifo *dfifo;
1397 mod->irq_empty = usbhsf_irq_empty;
1398 mod->irq_ready = usbhsf_irq_ready;
1399 mod->irq_bempsts = 0;
1400 mod->irq_brdysts = 0;
1403 usbhs_for_each_dfifo(priv, dfifo, i)
1407 void usbhs_fifo_quit(struct usbhs_priv *priv)
1409 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1411 mod->irq_empty = NULL;
1412 mod->irq_ready = NULL;
1413 mod->irq_bempsts = 0;
1414 mod->irq_brdysts = 0;
1417 #define __USBHS_DFIFO_INIT(priv, fifo, channel, fifo_port) \
1419 fifo = usbhsf_get_dnfifo(priv, channel); \
1420 fifo->name = "D"#channel"FIFO"; \
1421 fifo->port = fifo_port; \
1422 fifo->sel = D##channel##FIFOSEL; \
1423 fifo->ctr = D##channel##FIFOCTR; \
1424 fifo->tx_slave.shdma_slave.slave_id = \
1425 usbhs_get_dparam(priv, d##channel##_tx_id); \
1426 fifo->rx_slave.shdma_slave.slave_id = \
1427 usbhs_get_dparam(priv, d##channel##_rx_id); \
1428 usbhsf_dma_init(priv, fifo, channel); \
1431 #define USBHS_DFIFO_INIT(priv, fifo, channel) \
1432 __USBHS_DFIFO_INIT(priv, fifo, channel, D##channel##FIFO)
1433 #define USBHS_DFIFO_INIT_NO_PORT(priv, fifo, channel) \
1434 __USBHS_DFIFO_INIT(priv, fifo, channel, 0)
1436 int usbhs_fifo_probe(struct usbhs_priv *priv)
1438 struct usbhs_fifo *fifo;
1441 fifo = usbhsf_get_cfifo(priv);
1442 fifo->name = "CFIFO";
1444 fifo->sel = CFIFOSEL;
1445 fifo->ctr = CFIFOCTR;
1448 USBHS_DFIFO_INIT(priv, fifo, 0);
1449 USBHS_DFIFO_INIT(priv, fifo, 1);
1450 USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 2);
1451 USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 3);
1456 void usbhs_fifo_remove(struct usbhs_priv *priv)
1458 struct usbhs_fifo *fifo;
1461 usbhs_for_each_dfifo(priv, fifo, i)
1462 usbhsf_dma_quit(priv, fifo);