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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 #define usbhsf_is_cfifo(p, f)	(usbhsf_get_cfifo(p) == f)
27 
28 #define usbhsf_fifo_is_busy(f)	((f)->pipe) /* see usbhs_pipe_select_fifo */
29 
30 /*
31  *		packet initialize
32  */
usbhs_pkt_init(struct usbhs_pkt * pkt)33 void usbhs_pkt_init(struct usbhs_pkt *pkt)
34 {
35 	INIT_LIST_HEAD(&pkt->node);
36 }
37 
38 /*
39  *		packet control function
40  */
usbhsf_null_handle(struct usbhs_pkt * pkt,int * is_done)41 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
42 {
43 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
44 	struct device *dev = usbhs_priv_to_dev(priv);
45 
46 	dev_err(dev, "null handler\n");
47 
48 	return -EINVAL;
49 }
50 
51 static struct usbhs_pkt_handle usbhsf_null_handler = {
52 	.prepare = usbhsf_null_handle,
53 	.try_run = usbhsf_null_handle,
54 };
55 
usbhs_pkt_push(struct usbhs_pipe * pipe,struct usbhs_pkt * pkt,void (* done)(struct usbhs_priv * priv,struct usbhs_pkt * pkt),void * buf,int len,int zero,int sequence)56 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
57 		    void (*done)(struct usbhs_priv *priv,
58 				 struct usbhs_pkt *pkt),
59 		    void *buf, int len, int zero, int sequence)
60 {
61 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
62 	struct device *dev = usbhs_priv_to_dev(priv);
63 	unsigned long flags;
64 
65 	if (!done) {
66 		dev_err(dev, "no done function\n");
67 		return;
68 	}
69 
70 	/********************  spin lock ********************/
71 	usbhs_lock(priv, flags);
72 
73 	if (!pipe->handler) {
74 		dev_err(dev, "no handler function\n");
75 		pipe->handler = &usbhsf_null_handler;
76 	}
77 
78 	list_move_tail(&pkt->node, &pipe->list);
79 
80 	/*
81 	 * each pkt must hold own handler.
82 	 * because handler might be changed by its situation.
83 	 * dma handler -> pio handler.
84 	 */
85 	pkt->pipe	= pipe;
86 	pkt->buf	= buf;
87 	pkt->handler	= pipe->handler;
88 	pkt->length	= len;
89 	pkt->zero	= zero;
90 	pkt->actual	= 0;
91 	pkt->done	= done;
92 	pkt->sequence	= sequence;
93 
94 	usbhs_unlock(priv, flags);
95 	/********************  spin unlock ******************/
96 }
97 
__usbhsf_pkt_del(struct usbhs_pkt * pkt)98 static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
99 {
100 	list_del_init(&pkt->node);
101 }
102 
__usbhsf_pkt_get(struct usbhs_pipe * pipe)103 static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
104 {
105 	if (list_empty(&pipe->list))
106 		return NULL;
107 
108 	return list_first_entry(&pipe->list, struct usbhs_pkt, node);
109 }
110 
usbhs_pkt_pop(struct usbhs_pipe * pipe,struct usbhs_pkt * pkt)111 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
112 {
113 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
114 	unsigned long flags;
115 
116 	/********************  spin lock ********************/
117 	usbhs_lock(priv, flags);
118 
119 	if (!pkt)
120 		pkt = __usbhsf_pkt_get(pipe);
121 
122 	if (pkt)
123 		__usbhsf_pkt_del(pkt);
124 
125 	usbhs_unlock(priv, flags);
126 	/********************  spin unlock ******************/
127 
128 	return pkt;
129 }
130 
131 enum {
132 	USBHSF_PKT_PREPARE,
133 	USBHSF_PKT_TRY_RUN,
134 	USBHSF_PKT_DMA_DONE,
135 };
136 
usbhsf_pkt_handler(struct usbhs_pipe * pipe,int type)137 static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
138 {
139 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
140 	struct usbhs_pkt *pkt;
141 	struct device *dev = usbhs_priv_to_dev(priv);
142 	int (*func)(struct usbhs_pkt *pkt, int *is_done);
143 	unsigned long flags;
144 	int ret = 0;
145 	int is_done = 0;
146 
147 	/********************  spin lock ********************/
148 	usbhs_lock(priv, flags);
149 
150 	pkt = __usbhsf_pkt_get(pipe);
151 	if (!pkt)
152 		goto __usbhs_pkt_handler_end;
153 
154 	switch (type) {
155 	case USBHSF_PKT_PREPARE:
156 		func = pkt->handler->prepare;
157 		break;
158 	case USBHSF_PKT_TRY_RUN:
159 		func = pkt->handler->try_run;
160 		break;
161 	case USBHSF_PKT_DMA_DONE:
162 		func = pkt->handler->dma_done;
163 		break;
164 	default:
165 		dev_err(dev, "unknown pkt handler\n");
166 		goto __usbhs_pkt_handler_end;
167 	}
168 
169 	ret = func(pkt, &is_done);
170 
171 	if (is_done)
172 		__usbhsf_pkt_del(pkt);
173 
174 __usbhs_pkt_handler_end:
175 	usbhs_unlock(priv, flags);
176 	/********************  spin unlock ******************/
177 
178 	if (is_done) {
179 		pkt->done(priv, pkt);
180 		usbhs_pkt_start(pipe);
181 	}
182 
183 	return ret;
184 }
185 
usbhs_pkt_start(struct usbhs_pipe * pipe)186 void usbhs_pkt_start(struct usbhs_pipe *pipe)
187 {
188 	usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
189 }
190 
191 /*
192  *		irq enable/disable function
193  */
194 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
195 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
196 #define usbhsf_irq_callback_ctrl(pipe, status, enable)			\
197 	({								\
198 		struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);	\
199 		struct usbhs_mod *mod = usbhs_mod_get_current(priv);	\
200 		u16 status = (1 << usbhs_pipe_number(pipe));		\
201 		if (!mod)						\
202 			return;						\
203 		if (enable)						\
204 			mod->status |= status;				\
205 		else							\
206 			mod->status &= ~status;				\
207 		usbhs_irq_callback_update(priv, mod);			\
208 	})
209 
usbhsf_tx_irq_ctrl(struct usbhs_pipe * pipe,int enable)210 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
211 {
212 	/*
213 	 * And DCP pipe can NOT use "ready interrupt" for "send"
214 	 * it should use "empty" interrupt.
215 	 * see
216 	 *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
217 	 *
218 	 * on the other hand, normal pipe can use "ready interrupt" for "send"
219 	 * even though it is single/double buffer
220 	 */
221 	if (usbhs_pipe_is_dcp(pipe))
222 		usbhsf_irq_empty_ctrl(pipe, enable);
223 	else
224 		usbhsf_irq_ready_ctrl(pipe, enable);
225 }
226 
usbhsf_rx_irq_ctrl(struct usbhs_pipe * pipe,int enable)227 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
228 {
229 	usbhsf_irq_ready_ctrl(pipe, enable);
230 }
231 
232 /*
233  *		FIFO ctrl
234  */
usbhsf_send_terminator(struct usbhs_pipe * pipe,struct usbhs_fifo * fifo)235 static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
236 				   struct usbhs_fifo *fifo)
237 {
238 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
239 
240 	usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
241 }
242 
usbhsf_fifo_barrier(struct usbhs_priv * priv,struct usbhs_fifo * fifo)243 static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
244 			       struct usbhs_fifo *fifo)
245 {
246 	int timeout = 1024;
247 
248 	do {
249 		/* The FIFO port is accessible */
250 		if (usbhs_read(priv, fifo->ctr) & FRDY)
251 			return 0;
252 
253 		udelay(10);
254 	} while (timeout--);
255 
256 	return -EBUSY;
257 }
258 
usbhsf_fifo_clear(struct usbhs_pipe * pipe,struct usbhs_fifo * fifo)259 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
260 			      struct usbhs_fifo *fifo)
261 {
262 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
263 
264 	if (!usbhs_pipe_is_dcp(pipe))
265 		usbhsf_fifo_barrier(priv, fifo);
266 
267 	usbhs_write(priv, fifo->ctr, BCLR);
268 }
269 
usbhsf_fifo_rcv_len(struct usbhs_priv * priv,struct usbhs_fifo * fifo)270 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
271 			       struct usbhs_fifo *fifo)
272 {
273 	return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
274 }
275 
usbhsf_fifo_unselect(struct usbhs_pipe * pipe,struct usbhs_fifo * fifo)276 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
277 				 struct usbhs_fifo *fifo)
278 {
279 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
280 
281 	usbhs_pipe_select_fifo(pipe, NULL);
282 	usbhs_write(priv, fifo->sel, 0);
283 }
284 
usbhsf_fifo_select(struct usbhs_pipe * pipe,struct usbhs_fifo * fifo,int write)285 static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
286 			      struct usbhs_fifo *fifo,
287 			      int write)
288 {
289 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
290 	struct device *dev = usbhs_priv_to_dev(priv);
291 	int timeout = 1024;
292 	u16 mask = ((1 << 5) | 0xF);		/* mask of ISEL | CURPIPE */
293 	u16 base = usbhs_pipe_number(pipe);	/* CURPIPE */
294 
295 	if (usbhs_pipe_is_busy(pipe) ||
296 	    usbhsf_fifo_is_busy(fifo))
297 		return -EBUSY;
298 
299 	if (usbhs_pipe_is_dcp(pipe)) {
300 		base |= (1 == write) << 5;	/* ISEL */
301 
302 		if (usbhs_mod_is_host(priv))
303 			usbhs_dcp_dir_for_host(pipe, write);
304 	}
305 
306 	/* "base" will be used below  */
307 	if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo))
308 		usbhs_write(priv, fifo->sel, base);
309 	else
310 		usbhs_write(priv, fifo->sel, base | MBW_32);
311 
312 	/* check ISEL and CURPIPE value */
313 	while (timeout--) {
314 		if (base == (mask & usbhs_read(priv, fifo->sel))) {
315 			usbhs_pipe_select_fifo(pipe, fifo);
316 			return 0;
317 		}
318 		udelay(10);
319 	}
320 
321 	dev_err(dev, "fifo select error\n");
322 
323 	return -EIO;
324 }
325 
326 /*
327  *		DCP status stage
328  */
usbhs_dcp_dir_switch_to_write(struct usbhs_pkt * pkt,int * is_done)329 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
330 {
331 	struct usbhs_pipe *pipe = pkt->pipe;
332 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
333 	struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
334 	struct device *dev = usbhs_priv_to_dev(priv);
335 	int ret;
336 
337 	usbhs_pipe_disable(pipe);
338 
339 	ret = usbhsf_fifo_select(pipe, fifo, 1);
340 	if (ret < 0) {
341 		dev_err(dev, "%s() faile\n", __func__);
342 		return ret;
343 	}
344 
345 	usbhs_pipe_sequence_data1(pipe); /* DATA1 */
346 
347 	usbhsf_fifo_clear(pipe, fifo);
348 	usbhsf_send_terminator(pipe, fifo);
349 
350 	usbhsf_fifo_unselect(pipe, fifo);
351 
352 	usbhsf_tx_irq_ctrl(pipe, 1);
353 	usbhs_pipe_enable(pipe);
354 
355 	return ret;
356 }
357 
usbhs_dcp_dir_switch_to_read(struct usbhs_pkt * pkt,int * is_done)358 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
359 {
360 	struct usbhs_pipe *pipe = pkt->pipe;
361 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
362 	struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
363 	struct device *dev = usbhs_priv_to_dev(priv);
364 	int ret;
365 
366 	usbhs_pipe_disable(pipe);
367 
368 	ret = usbhsf_fifo_select(pipe, fifo, 0);
369 	if (ret < 0) {
370 		dev_err(dev, "%s() fail\n", __func__);
371 		return ret;
372 	}
373 
374 	usbhs_pipe_sequence_data1(pipe); /* DATA1 */
375 	usbhsf_fifo_clear(pipe, fifo);
376 
377 	usbhsf_fifo_unselect(pipe, fifo);
378 
379 	usbhsf_rx_irq_ctrl(pipe, 1);
380 	usbhs_pipe_enable(pipe);
381 
382 	return ret;
383 
384 }
385 
usbhs_dcp_dir_switch_done(struct usbhs_pkt * pkt,int * is_done)386 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
387 {
388 	struct usbhs_pipe *pipe = pkt->pipe;
389 
390 	if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
391 		usbhsf_tx_irq_ctrl(pipe, 0);
392 	else
393 		usbhsf_rx_irq_ctrl(pipe, 0);
394 
395 	pkt->actual = pkt->length;
396 	*is_done = 1;
397 
398 	return 0;
399 }
400 
401 struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
402 	.prepare = usbhs_dcp_dir_switch_to_write,
403 	.try_run = usbhs_dcp_dir_switch_done,
404 };
405 
406 struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
407 	.prepare = usbhs_dcp_dir_switch_to_read,
408 	.try_run = usbhs_dcp_dir_switch_done,
409 };
410 
411 /*
412  *		DCP data stage (push)
413  */
usbhsf_dcp_data_stage_try_push(struct usbhs_pkt * pkt,int * is_done)414 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
415 {
416 	struct usbhs_pipe *pipe = pkt->pipe;
417 
418 	usbhs_pipe_sequence_data1(pipe); /* DATA1 */
419 
420 	/*
421 	 * change handler to PIO push
422 	 */
423 	pkt->handler = &usbhs_fifo_pio_push_handler;
424 
425 	return pkt->handler->prepare(pkt, is_done);
426 }
427 
428 struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
429 	.prepare = usbhsf_dcp_data_stage_try_push,
430 };
431 
432 /*
433  *		DCP data stage (pop)
434  */
usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt * pkt,int * is_done)435 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
436 					     int *is_done)
437 {
438 	struct usbhs_pipe *pipe = pkt->pipe;
439 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
440 	struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
441 
442 	if (usbhs_pipe_is_busy(pipe))
443 		return 0;
444 
445 	/*
446 	 * prepare pop for DCP should
447 	 *  - change DCP direction,
448 	 *  - clear fifo
449 	 *  - DATA1
450 	 */
451 	usbhs_pipe_disable(pipe);
452 
453 	usbhs_pipe_sequence_data1(pipe); /* DATA1 */
454 
455 	usbhsf_fifo_select(pipe, fifo, 0);
456 	usbhsf_fifo_clear(pipe, fifo);
457 	usbhsf_fifo_unselect(pipe, fifo);
458 
459 	/*
460 	 * change handler to PIO pop
461 	 */
462 	pkt->handler = &usbhs_fifo_pio_pop_handler;
463 
464 	return pkt->handler->prepare(pkt, is_done);
465 }
466 
467 struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
468 	.prepare = usbhsf_dcp_data_stage_prepare_pop,
469 };
470 
471 /*
472  *		PIO push handler
473  */
usbhsf_pio_try_push(struct usbhs_pkt * pkt,int * is_done)474 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
475 {
476 	struct usbhs_pipe *pipe = pkt->pipe;
477 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
478 	struct device *dev = usbhs_priv_to_dev(priv);
479 	struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
480 	void __iomem *addr = priv->base + fifo->port;
481 	u8 *buf;
482 	int maxp = usbhs_pipe_get_maxpacket(pipe);
483 	int total_len;
484 	int i, ret, len;
485 	int is_short;
486 
487 	usbhs_pipe_data_sequence(pipe, pkt->sequence);
488 	pkt->sequence = -1; /* -1 sequence will be ignored */
489 
490 	usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
491 
492 	ret = usbhsf_fifo_select(pipe, fifo, 1);
493 	if (ret < 0)
494 		return 0;
495 
496 	ret = usbhs_pipe_is_accessible(pipe);
497 	if (ret < 0) {
498 		/* inaccessible pipe is not an error */
499 		ret = 0;
500 		goto usbhs_fifo_write_busy;
501 	}
502 
503 	ret = usbhsf_fifo_barrier(priv, fifo);
504 	if (ret < 0)
505 		goto usbhs_fifo_write_busy;
506 
507 	buf		= pkt->buf    + pkt->actual;
508 	len		= pkt->length - pkt->actual;
509 	len		= min(len, maxp);
510 	total_len	= len;
511 	is_short	= total_len < maxp;
512 
513 	/*
514 	 * FIXME
515 	 *
516 	 * 32-bit access only
517 	 */
518 	if (len >= 4 && !((unsigned long)buf & 0x03)) {
519 		iowrite32_rep(addr, buf, len / 4);
520 		len %= 4;
521 		buf += total_len - len;
522 	}
523 
524 	/* the rest operation */
525 	for (i = 0; i < len; i++)
526 		iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
527 
528 	/*
529 	 * variable update
530 	 */
531 	pkt->actual += total_len;
532 
533 	if (pkt->actual < pkt->length)
534 		*is_done = 0;		/* there are remainder data */
535 	else if (is_short)
536 		*is_done = 1;		/* short packet */
537 	else
538 		*is_done = !pkt->zero;	/* send zero packet ? */
539 
540 	/*
541 	 * pipe/irq handling
542 	 */
543 	if (is_short)
544 		usbhsf_send_terminator(pipe, fifo);
545 
546 	usbhsf_tx_irq_ctrl(pipe, !*is_done);
547 	usbhs_pipe_enable(pipe);
548 
549 	dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
550 		usbhs_pipe_number(pipe),
551 		pkt->length, pkt->actual, *is_done, pkt->zero);
552 
553 	/*
554 	 * Transmission end
555 	 */
556 	if (*is_done) {
557 		if (usbhs_pipe_is_dcp(pipe))
558 			usbhs_dcp_control_transfer_done(pipe);
559 	}
560 
561 	usbhsf_fifo_unselect(pipe, fifo);
562 
563 	return 0;
564 
565 usbhs_fifo_write_busy:
566 	usbhsf_fifo_unselect(pipe, fifo);
567 
568 	/*
569 	 * pipe is busy.
570 	 * retry in interrupt
571 	 */
572 	usbhsf_tx_irq_ctrl(pipe, 1);
573 
574 	return ret;
575 }
576 
577 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
578 	.prepare = usbhsf_pio_try_push,
579 	.try_run = usbhsf_pio_try_push,
580 };
581 
582 /*
583  *		PIO pop handler
584  */
usbhsf_prepare_pop(struct usbhs_pkt * pkt,int * is_done)585 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
586 {
587 	struct usbhs_pipe *pipe = pkt->pipe;
588 
589 	if (usbhs_pipe_is_busy(pipe))
590 		return 0;
591 
592 	/*
593 	 * pipe enable to prepare packet receive
594 	 */
595 	usbhs_pipe_data_sequence(pipe, pkt->sequence);
596 	pkt->sequence = -1; /* -1 sequence will be ignored */
597 
598 	usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
599 	usbhs_pipe_enable(pipe);
600 	usbhsf_rx_irq_ctrl(pipe, 1);
601 
602 	return 0;
603 }
604 
usbhsf_pio_try_pop(struct usbhs_pkt * pkt,int * is_done)605 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
606 {
607 	struct usbhs_pipe *pipe = pkt->pipe;
608 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
609 	struct device *dev = usbhs_priv_to_dev(priv);
610 	struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
611 	void __iomem *addr = priv->base + fifo->port;
612 	u8 *buf;
613 	u32 data = 0;
614 	int maxp = usbhs_pipe_get_maxpacket(pipe);
615 	int rcv_len, len;
616 	int i, ret;
617 	int total_len = 0;
618 
619 	ret = usbhsf_fifo_select(pipe, fifo, 0);
620 	if (ret < 0)
621 		return 0;
622 
623 	ret = usbhsf_fifo_barrier(priv, fifo);
624 	if (ret < 0)
625 		goto usbhs_fifo_read_busy;
626 
627 	rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
628 
629 	buf		= pkt->buf    + pkt->actual;
630 	len		= pkt->length - pkt->actual;
631 	len		= min(len, rcv_len);
632 	total_len	= len;
633 
634 	/*
635 	 * update actual length first here to decide disable pipe.
636 	 * if this pipe keeps BUF status and all data were popped,
637 	 * then, next interrupt/token will be issued again
638 	 */
639 	pkt->actual += total_len;
640 
641 	if ((pkt->actual == pkt->length) ||	/* receive all data */
642 	    (total_len < maxp)) {		/* short packet */
643 		*is_done = 1;
644 		usbhsf_rx_irq_ctrl(pipe, 0);
645 		usbhs_pipe_disable(pipe);	/* disable pipe first */
646 	}
647 
648 	/*
649 	 * Buffer clear if Zero-Length packet
650 	 *
651 	 * see
652 	 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
653 	 */
654 	if (0 == rcv_len) {
655 		pkt->zero = 1;
656 		usbhsf_fifo_clear(pipe, fifo);
657 		goto usbhs_fifo_read_end;
658 	}
659 
660 	/*
661 	 * FIXME
662 	 *
663 	 * 32-bit access only
664 	 */
665 	if (len >= 4 && !((unsigned long)buf & 0x03)) {
666 		ioread32_rep(addr, buf, len / 4);
667 		len %= 4;
668 		buf += total_len - len;
669 	}
670 
671 	/* the rest operation */
672 	for (i = 0; i < len; i++) {
673 		if (!(i & 0x03))
674 			data = ioread32(addr);
675 
676 		buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
677 	}
678 
679 usbhs_fifo_read_end:
680 	dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
681 		usbhs_pipe_number(pipe),
682 		pkt->length, pkt->actual, *is_done, pkt->zero);
683 
684 usbhs_fifo_read_busy:
685 	usbhsf_fifo_unselect(pipe, fifo);
686 
687 	return ret;
688 }
689 
690 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
691 	.prepare = usbhsf_prepare_pop,
692 	.try_run = usbhsf_pio_try_pop,
693 };
694 
695 /*
696  *		DCP ctrol statge handler
697  */
usbhsf_ctrl_stage_end(struct usbhs_pkt * pkt,int * is_done)698 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
699 {
700 	usbhs_dcp_control_transfer_done(pkt->pipe);
701 
702 	*is_done = 1;
703 
704 	return 0;
705 }
706 
707 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
708 	.prepare = usbhsf_ctrl_stage_end,
709 	.try_run = usbhsf_ctrl_stage_end,
710 };
711 
712 /*
713  *		DMA fifo functions
714  */
usbhsf_dma_chan_get(struct usbhs_fifo * fifo,struct usbhs_pkt * pkt)715 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
716 					    struct usbhs_pkt *pkt)
717 {
718 	if (&usbhs_fifo_dma_push_handler == pkt->handler)
719 		return fifo->tx_chan;
720 
721 	if (&usbhs_fifo_dma_pop_handler == pkt->handler)
722 		return fifo->rx_chan;
723 
724 	return NULL;
725 }
726 
usbhsf_get_dma_fifo(struct usbhs_priv * priv,struct usbhs_pkt * pkt)727 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
728 					      struct usbhs_pkt *pkt)
729 {
730 	struct usbhs_fifo *fifo;
731 
732 	/* DMA :: D0FIFO */
733 	fifo = usbhsf_get_d0fifo(priv);
734 	if (usbhsf_dma_chan_get(fifo, pkt) &&
735 	    !usbhsf_fifo_is_busy(fifo))
736 		return fifo;
737 
738 	/* DMA :: D1FIFO */
739 	fifo = usbhsf_get_d1fifo(priv);
740 	if (usbhsf_dma_chan_get(fifo, pkt) &&
741 	    !usbhsf_fifo_is_busy(fifo))
742 		return fifo;
743 
744 	return NULL;
745 }
746 
747 #define usbhsf_dma_start(p, f)	__usbhsf_dma_ctrl(p, f, DREQE)
748 #define usbhsf_dma_stop(p, f)	__usbhsf_dma_ctrl(p, f, 0)
__usbhsf_dma_ctrl(struct usbhs_pipe * pipe,struct usbhs_fifo * fifo,u16 dreqe)749 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
750 			      struct usbhs_fifo *fifo,
751 			      u16 dreqe)
752 {
753 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
754 
755 	usbhs_bset(priv, fifo->sel, DREQE, dreqe);
756 }
757 
758 #define usbhsf_dma_map(p)	__usbhsf_dma_map_ctrl(p, 1)
759 #define usbhsf_dma_unmap(p)	__usbhsf_dma_map_ctrl(p, 0)
__usbhsf_dma_map_ctrl(struct usbhs_pkt * pkt,int map)760 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
761 {
762 	struct usbhs_pipe *pipe = pkt->pipe;
763 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
764 	struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
765 
766 	return info->dma_map_ctrl(pkt, map);
767 }
768 
769 static void usbhsf_dma_complete(void *arg);
xfer_work(struct work_struct * work)770 static void xfer_work(struct work_struct *work)
771 {
772 	struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
773 	struct usbhs_pipe *pipe = pkt->pipe;
774 	struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
775 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
776 	struct dma_async_tx_descriptor *desc;
777 	struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
778 	struct device *dev = usbhs_priv_to_dev(priv);
779 	enum dma_transfer_direction dir;
780 
781 	dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
782 
783 	desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
784 					pkt->trans, dir,
785 					DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
786 	if (!desc)
787 		return;
788 
789 	desc->callback		= usbhsf_dma_complete;
790 	desc->callback_param	= pipe;
791 
792 	if (dmaengine_submit(desc) < 0) {
793 		dev_err(dev, "Failed to submit dma descriptor\n");
794 		return;
795 	}
796 
797 	dev_dbg(dev, "  %s %d (%d/ %d)\n",
798 		fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
799 
800 	usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
801 	usbhs_pipe_enable(pipe);
802 	usbhsf_dma_start(pipe, fifo);
803 	dma_async_issue_pending(chan);
804 }
805 
806 /*
807  *		DMA push handler
808  */
usbhsf_dma_prepare_push(struct usbhs_pkt * pkt,int * is_done)809 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
810 {
811 	struct usbhs_pipe *pipe = pkt->pipe;
812 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
813 	struct usbhs_fifo *fifo;
814 	int len = pkt->length - pkt->actual;
815 	int ret;
816 
817 	if (usbhs_pipe_is_busy(pipe))
818 		return 0;
819 
820 	/* use PIO if packet is less than pio_dma_border or pipe is DCP */
821 	if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
822 	    usbhs_pipe_is_dcp(pipe))
823 		goto usbhsf_pio_prepare_push;
824 
825 	if (len & 0x7) /* 8byte alignment */
826 		goto usbhsf_pio_prepare_push;
827 
828 	if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
829 		goto usbhsf_pio_prepare_push;
830 
831 	/* get enable DMA fifo */
832 	fifo = usbhsf_get_dma_fifo(priv, pkt);
833 	if (!fifo)
834 		goto usbhsf_pio_prepare_push;
835 
836 	if (usbhsf_dma_map(pkt) < 0)
837 		goto usbhsf_pio_prepare_push;
838 
839 	ret = usbhsf_fifo_select(pipe, fifo, 0);
840 	if (ret < 0)
841 		goto usbhsf_pio_prepare_push_unmap;
842 
843 	pkt->trans = len;
844 
845 	INIT_WORK(&pkt->work, xfer_work);
846 	schedule_work(&pkt->work);
847 
848 	return 0;
849 
850 usbhsf_pio_prepare_push_unmap:
851 	usbhsf_dma_unmap(pkt);
852 usbhsf_pio_prepare_push:
853 	/*
854 	 * change handler to PIO
855 	 */
856 	pkt->handler = &usbhs_fifo_pio_push_handler;
857 
858 	return pkt->handler->prepare(pkt, is_done);
859 }
860 
usbhsf_dma_push_done(struct usbhs_pkt * pkt,int * is_done)861 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
862 {
863 	struct usbhs_pipe *pipe = pkt->pipe;
864 
865 	pkt->actual = pkt->trans;
866 
867 	*is_done = !pkt->zero;	/* send zero packet ? */
868 
869 	usbhsf_dma_stop(pipe, pipe->fifo);
870 	usbhsf_dma_unmap(pkt);
871 	usbhsf_fifo_unselect(pipe, pipe->fifo);
872 
873 	return 0;
874 }
875 
876 struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
877 	.prepare	= usbhsf_dma_prepare_push,
878 	.dma_done	= usbhsf_dma_push_done,
879 };
880 
881 /*
882  *		DMA pop handler
883  */
usbhsf_dma_try_pop(struct usbhs_pkt * pkt,int * is_done)884 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
885 {
886 	struct usbhs_pipe *pipe = pkt->pipe;
887 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
888 	struct usbhs_fifo *fifo;
889 	int len, ret;
890 
891 	if (usbhs_pipe_is_busy(pipe))
892 		return 0;
893 
894 	if (usbhs_pipe_is_dcp(pipe))
895 		goto usbhsf_pio_prepare_pop;
896 
897 	/* get enable DMA fifo */
898 	fifo = usbhsf_get_dma_fifo(priv, pkt);
899 	if (!fifo)
900 		goto usbhsf_pio_prepare_pop;
901 
902 	if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
903 		goto usbhsf_pio_prepare_pop;
904 
905 	ret = usbhsf_fifo_select(pipe, fifo, 0);
906 	if (ret < 0)
907 		goto usbhsf_pio_prepare_pop;
908 
909 	/* use PIO if packet is less than pio_dma_border */
910 	len = usbhsf_fifo_rcv_len(priv, fifo);
911 	len = min(pkt->length - pkt->actual, len);
912 	if (len & 0x7) /* 8byte alignment */
913 		goto usbhsf_pio_prepare_pop_unselect;
914 
915 	if (len < usbhs_get_dparam(priv, pio_dma_border))
916 		goto usbhsf_pio_prepare_pop_unselect;
917 
918 	ret = usbhsf_fifo_barrier(priv, fifo);
919 	if (ret < 0)
920 		goto usbhsf_pio_prepare_pop_unselect;
921 
922 	if (usbhsf_dma_map(pkt) < 0)
923 		goto usbhsf_pio_prepare_pop_unselect;
924 
925 	/* DMA */
926 
927 	/*
928 	 * usbhs_fifo_dma_pop_handler :: prepare
929 	 * enabled irq to come here.
930 	 * but it is no longer needed for DMA. disable it.
931 	 */
932 	usbhsf_rx_irq_ctrl(pipe, 0);
933 
934 	pkt->trans = len;
935 
936 	INIT_WORK(&pkt->work, xfer_work);
937 	schedule_work(&pkt->work);
938 
939 	return 0;
940 
941 usbhsf_pio_prepare_pop_unselect:
942 	usbhsf_fifo_unselect(pipe, fifo);
943 usbhsf_pio_prepare_pop:
944 
945 	/*
946 	 * change handler to PIO
947 	 */
948 	pkt->handler = &usbhs_fifo_pio_pop_handler;
949 
950 	return pkt->handler->try_run(pkt, is_done);
951 }
952 
usbhsf_dma_pop_done(struct usbhs_pkt * pkt,int * is_done)953 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
954 {
955 	struct usbhs_pipe *pipe = pkt->pipe;
956 	int maxp = usbhs_pipe_get_maxpacket(pipe);
957 
958 	usbhsf_dma_stop(pipe, pipe->fifo);
959 	usbhsf_dma_unmap(pkt);
960 	usbhsf_fifo_unselect(pipe, pipe->fifo);
961 
962 	pkt->actual += pkt->trans;
963 
964 	if ((pkt->actual == pkt->length) ||	/* receive all data */
965 	    (pkt->trans < maxp)) {		/* short packet */
966 		*is_done = 1;
967 	} else {
968 		/* re-enable */
969 		usbhsf_prepare_pop(pkt, is_done);
970 	}
971 
972 	return 0;
973 }
974 
975 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
976 	.prepare	= usbhsf_prepare_pop,
977 	.try_run	= usbhsf_dma_try_pop,
978 	.dma_done	= usbhsf_dma_pop_done
979 };
980 
981 /*
982  *		DMA setting
983  */
usbhsf_dma_filter(struct dma_chan * chan,void * param)984 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
985 {
986 	struct sh_dmae_slave *slave = param;
987 
988 	/*
989 	 * FIXME
990 	 *
991 	 * usbhs doesn't recognize id = 0 as valid DMA
992 	 */
993 	if (0 == slave->shdma_slave.slave_id)
994 		return false;
995 
996 	chan->private = slave;
997 
998 	return true;
999 }
1000 
usbhsf_dma_quit(struct usbhs_priv * priv,struct usbhs_fifo * fifo)1001 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1002 {
1003 	if (fifo->tx_chan)
1004 		dma_release_channel(fifo->tx_chan);
1005 	if (fifo->rx_chan)
1006 		dma_release_channel(fifo->rx_chan);
1007 
1008 	fifo->tx_chan = NULL;
1009 	fifo->rx_chan = NULL;
1010 }
1011 
usbhsf_dma_init(struct usbhs_priv * priv,struct usbhs_fifo * fifo)1012 static void usbhsf_dma_init(struct usbhs_priv *priv,
1013 			    struct usbhs_fifo *fifo)
1014 {
1015 	struct device *dev = usbhs_priv_to_dev(priv);
1016 	dma_cap_mask_t mask;
1017 
1018 	dma_cap_zero(mask);
1019 	dma_cap_set(DMA_SLAVE, mask);
1020 	fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1021 					    &fifo->tx_slave);
1022 
1023 	dma_cap_zero(mask);
1024 	dma_cap_set(DMA_SLAVE, mask);
1025 	fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1026 					    &fifo->rx_slave);
1027 
1028 	if (fifo->tx_chan || fifo->rx_chan)
1029 		dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1030 			 fifo->name,
1031 			 fifo->tx_chan ? "[TX]" : "    ",
1032 			 fifo->rx_chan ? "[RX]" : "    ");
1033 }
1034 
1035 /*
1036  *		irq functions
1037  */
usbhsf_irq_empty(struct usbhs_priv * priv,struct usbhs_irq_state * irq_state)1038 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1039 			    struct usbhs_irq_state *irq_state)
1040 {
1041 	struct usbhs_pipe *pipe;
1042 	struct device *dev = usbhs_priv_to_dev(priv);
1043 	int i, ret;
1044 
1045 	if (!irq_state->bempsts) {
1046 		dev_err(dev, "debug %s !!\n", __func__);
1047 		return -EIO;
1048 	}
1049 
1050 	dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1051 
1052 	/*
1053 	 * search interrupted "pipe"
1054 	 * not "uep".
1055 	 */
1056 	usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1057 		if (!(irq_state->bempsts & (1 << i)))
1058 			continue;
1059 
1060 		ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1061 		if (ret < 0)
1062 			dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1063 	}
1064 
1065 	return 0;
1066 }
1067 
usbhsf_irq_ready(struct usbhs_priv * priv,struct usbhs_irq_state * irq_state)1068 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1069 			    struct usbhs_irq_state *irq_state)
1070 {
1071 	struct usbhs_pipe *pipe;
1072 	struct device *dev = usbhs_priv_to_dev(priv);
1073 	int i, ret;
1074 
1075 	if (!irq_state->brdysts) {
1076 		dev_err(dev, "debug %s !!\n", __func__);
1077 		return -EIO;
1078 	}
1079 
1080 	dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1081 
1082 	/*
1083 	 * search interrupted "pipe"
1084 	 * not "uep".
1085 	 */
1086 	usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1087 		if (!(irq_state->brdysts & (1 << i)))
1088 			continue;
1089 
1090 		ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1091 		if (ret < 0)
1092 			dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1093 	}
1094 
1095 	return 0;
1096 }
1097 
usbhsf_dma_complete(void * arg)1098 static void usbhsf_dma_complete(void *arg)
1099 {
1100 	struct usbhs_pipe *pipe = arg;
1101 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1102 	struct device *dev = usbhs_priv_to_dev(priv);
1103 	int ret;
1104 
1105 	ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1106 	if (ret < 0)
1107 		dev_err(dev, "dma_complete run_error %d : %d\n",
1108 			usbhs_pipe_number(pipe), ret);
1109 }
1110 
1111 /*
1112  *		fifo init
1113  */
usbhs_fifo_init(struct usbhs_priv * priv)1114 void usbhs_fifo_init(struct usbhs_priv *priv)
1115 {
1116 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1117 	struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1118 	struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv);
1119 	struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv);
1120 
1121 	mod->irq_empty		= usbhsf_irq_empty;
1122 	mod->irq_ready		= usbhsf_irq_ready;
1123 	mod->irq_bempsts	= 0;
1124 	mod->irq_brdysts	= 0;
1125 
1126 	cfifo->pipe	= NULL;
1127 	cfifo->tx_chan	= NULL;
1128 	cfifo->rx_chan	= NULL;
1129 
1130 	d0fifo->pipe	= NULL;
1131 	d0fifo->tx_chan	= NULL;
1132 	d0fifo->rx_chan	= NULL;
1133 
1134 	d1fifo->pipe	= NULL;
1135 	d1fifo->tx_chan	= NULL;
1136 	d1fifo->rx_chan	= NULL;
1137 
1138 	usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv));
1139 	usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv));
1140 }
1141 
usbhs_fifo_quit(struct usbhs_priv * priv)1142 void usbhs_fifo_quit(struct usbhs_priv *priv)
1143 {
1144 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1145 
1146 	mod->irq_empty		= NULL;
1147 	mod->irq_ready		= NULL;
1148 	mod->irq_bempsts	= 0;
1149 	mod->irq_brdysts	= 0;
1150 
1151 	usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv));
1152 	usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv));
1153 }
1154 
usbhs_fifo_probe(struct usbhs_priv * priv)1155 int usbhs_fifo_probe(struct usbhs_priv *priv)
1156 {
1157 	struct usbhs_fifo *fifo;
1158 
1159 	/* CFIFO */
1160 	fifo = usbhsf_get_cfifo(priv);
1161 	fifo->name	= "CFIFO";
1162 	fifo->port	= CFIFO;
1163 	fifo->sel	= CFIFOSEL;
1164 	fifo->ctr	= CFIFOCTR;
1165 
1166 	/* D0FIFO */
1167 	fifo = usbhsf_get_d0fifo(priv);
1168 	fifo->name	= "D0FIFO";
1169 	fifo->port	= D0FIFO;
1170 	fifo->sel	= D0FIFOSEL;
1171 	fifo->ctr	= D0FIFOCTR;
1172 	fifo->tx_slave.shdma_slave.slave_id	= usbhs_get_dparam(priv, d0_tx_id);
1173 	fifo->rx_slave.shdma_slave.slave_id	= usbhs_get_dparam(priv, d0_rx_id);
1174 
1175 	/* D1FIFO */
1176 	fifo = usbhsf_get_d1fifo(priv);
1177 	fifo->name	= "D1FIFO";
1178 	fifo->port	= D1FIFO;
1179 	fifo->sel	= D1FIFOSEL;
1180 	fifo->ctr	= D1FIFOCTR;
1181 	fifo->tx_slave.shdma_slave.slave_id	= usbhs_get_dparam(priv, d1_tx_id);
1182 	fifo->rx_slave.shdma_slave.slave_id	= usbhs_get_dparam(priv, d1_rx_id);
1183 
1184 	return 0;
1185 }
1186 
usbhs_fifo_remove(struct usbhs_priv * priv)1187 void usbhs_fifo_remove(struct usbhs_priv *priv)
1188 {
1189 }
1190