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/slab.h>
10 #include "common.h"
11 #include "pipe.h"
12 
13 /*
14  *		macros
15  */
16 #define usbhsp_addr_offset(p)	((usbhs_pipe_number(p) - 1) * 2)
17 
18 #define usbhsp_flags_set(p, f)	((p)->flags |=  USBHS_PIPE_FLAGS_##f)
19 #define usbhsp_flags_clr(p, f)	((p)->flags &= ~USBHS_PIPE_FLAGS_##f)
20 #define usbhsp_flags_has(p, f)	((p)->flags &   USBHS_PIPE_FLAGS_##f)
21 #define usbhsp_flags_init(p)	do {(p)->flags = 0; } while (0)
22 
23 /*
24  * for debug
25  */
26 static char *usbhsp_pipe_name[] = {
27 	[USB_ENDPOINT_XFER_CONTROL]	= "DCP",
28 	[USB_ENDPOINT_XFER_BULK]	= "BULK",
29 	[USB_ENDPOINT_XFER_INT]		= "INT",
30 	[USB_ENDPOINT_XFER_ISOC]	= "ISO",
31 };
32 
usbhs_pipe_name(struct usbhs_pipe * pipe)33 char *usbhs_pipe_name(struct usbhs_pipe *pipe)
34 {
35 	return usbhsp_pipe_name[usbhs_pipe_type(pipe)];
36 }
37 
38 static struct renesas_usbhs_driver_pipe_config
usbhsp_get_pipe_config(struct usbhs_priv * priv,int pipe_num)39 *usbhsp_get_pipe_config(struct usbhs_priv *priv, int pipe_num)
40 {
41 	struct renesas_usbhs_driver_pipe_config *pipe_configs =
42 					usbhs_get_dparam(priv, pipe_configs);
43 
44 	return &pipe_configs[pipe_num];
45 }
46 
47 /*
48  *		DCPCTR/PIPEnCTR functions
49  */
usbhsp_pipectrl_set(struct usbhs_pipe * pipe,u16 mask,u16 val)50 static void usbhsp_pipectrl_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
51 {
52 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
53 	int offset = usbhsp_addr_offset(pipe);
54 
55 	if (usbhs_pipe_is_dcp(pipe))
56 		usbhs_bset(priv, DCPCTR, mask, val);
57 	else
58 		usbhs_bset(priv, PIPEnCTR + offset, mask, val);
59 }
60 
usbhsp_pipectrl_get(struct usbhs_pipe * pipe)61 static u16 usbhsp_pipectrl_get(struct usbhs_pipe *pipe)
62 {
63 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
64 	int offset = usbhsp_addr_offset(pipe);
65 
66 	if (usbhs_pipe_is_dcp(pipe))
67 		return usbhs_read(priv, DCPCTR);
68 	else
69 		return usbhs_read(priv, PIPEnCTR + offset);
70 }
71 
72 /*
73  *		DCP/PIPE functions
74  */
__usbhsp_pipe_xxx_set(struct usbhs_pipe * pipe,u16 dcp_reg,u16 pipe_reg,u16 mask,u16 val)75 static void __usbhsp_pipe_xxx_set(struct usbhs_pipe *pipe,
76 				  u16 dcp_reg, u16 pipe_reg,
77 				  u16 mask, u16 val)
78 {
79 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
80 
81 	if (usbhs_pipe_is_dcp(pipe))
82 		usbhs_bset(priv, dcp_reg, mask, val);
83 	else
84 		usbhs_bset(priv, pipe_reg, mask, val);
85 }
86 
__usbhsp_pipe_xxx_get(struct usbhs_pipe * pipe,u16 dcp_reg,u16 pipe_reg)87 static u16 __usbhsp_pipe_xxx_get(struct usbhs_pipe *pipe,
88 				 u16 dcp_reg, u16 pipe_reg)
89 {
90 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
91 
92 	if (usbhs_pipe_is_dcp(pipe))
93 		return usbhs_read(priv, dcp_reg);
94 	else
95 		return usbhs_read(priv, pipe_reg);
96 }
97 
98 /*
99  *		DCPCFG/PIPECFG functions
100  */
usbhsp_pipe_cfg_set(struct usbhs_pipe * pipe,u16 mask,u16 val)101 static void usbhsp_pipe_cfg_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
102 {
103 	__usbhsp_pipe_xxx_set(pipe, DCPCFG, PIPECFG, mask, val);
104 }
105 
usbhsp_pipe_cfg_get(struct usbhs_pipe * pipe)106 static u16 usbhsp_pipe_cfg_get(struct usbhs_pipe *pipe)
107 {
108 	return __usbhsp_pipe_xxx_get(pipe, DCPCFG, PIPECFG);
109 }
110 
111 /*
112  *		PIPEnTRN/PIPEnTRE functions
113  */
usbhsp_pipe_trn_set(struct usbhs_pipe * pipe,u16 mask,u16 val)114 static void usbhsp_pipe_trn_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
115 {
116 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
117 	struct device *dev = usbhs_priv_to_dev(priv);
118 	int num = usbhs_pipe_number(pipe);
119 	u16 reg;
120 
121 	/*
122 	 * It is impossible to calculate address,
123 	 * since PIPEnTRN addresses were mapped randomly.
124 	 */
125 #define CASE_PIPExTRN(a)		\
126 	case 0x ## a:			\
127 		reg = PIPE ## a ## TRN;	\
128 		break;
129 
130 	switch (num) {
131 	CASE_PIPExTRN(1);
132 	CASE_PIPExTRN(2);
133 	CASE_PIPExTRN(3);
134 	CASE_PIPExTRN(4);
135 	CASE_PIPExTRN(5);
136 	CASE_PIPExTRN(B);
137 	CASE_PIPExTRN(C);
138 	CASE_PIPExTRN(D);
139 	CASE_PIPExTRN(E);
140 	CASE_PIPExTRN(F);
141 	CASE_PIPExTRN(9);
142 	CASE_PIPExTRN(A);
143 	default:
144 		dev_err(dev, "unknown pipe (%d)\n", num);
145 		return;
146 	}
147 	__usbhsp_pipe_xxx_set(pipe, 0, reg, mask, val);
148 }
149 
usbhsp_pipe_tre_set(struct usbhs_pipe * pipe,u16 mask,u16 val)150 static void usbhsp_pipe_tre_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
151 {
152 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
153 	struct device *dev = usbhs_priv_to_dev(priv);
154 	int num = usbhs_pipe_number(pipe);
155 	u16 reg;
156 
157 	/*
158 	 * It is impossible to calculate address,
159 	 * since PIPEnTRE addresses were mapped randomly.
160 	 */
161 #define CASE_PIPExTRE(a)			\
162 	case 0x ## a:				\
163 		reg = PIPE ## a ## TRE;		\
164 		break;
165 
166 	switch (num) {
167 	CASE_PIPExTRE(1);
168 	CASE_PIPExTRE(2);
169 	CASE_PIPExTRE(3);
170 	CASE_PIPExTRE(4);
171 	CASE_PIPExTRE(5);
172 	CASE_PIPExTRE(B);
173 	CASE_PIPExTRE(C);
174 	CASE_PIPExTRE(D);
175 	CASE_PIPExTRE(E);
176 	CASE_PIPExTRE(F);
177 	CASE_PIPExTRE(9);
178 	CASE_PIPExTRE(A);
179 	default:
180 		dev_err(dev, "unknown pipe (%d)\n", num);
181 		return;
182 	}
183 
184 	__usbhsp_pipe_xxx_set(pipe, 0, reg, mask, val);
185 }
186 
187 /*
188  *		PIPEBUF
189  */
usbhsp_pipe_buf_set(struct usbhs_pipe * pipe,u16 mask,u16 val)190 static void usbhsp_pipe_buf_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
191 {
192 	if (usbhs_pipe_is_dcp(pipe))
193 		return;
194 
195 	__usbhsp_pipe_xxx_set(pipe, 0, PIPEBUF, mask, val);
196 }
197 
198 /*
199  *		DCPMAXP/PIPEMAXP
200  */
usbhsp_pipe_maxp_set(struct usbhs_pipe * pipe,u16 mask,u16 val)201 static void usbhsp_pipe_maxp_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
202 {
203 	__usbhsp_pipe_xxx_set(pipe, DCPMAXP, PIPEMAXP, mask, val);
204 }
205 
206 /*
207  *		pipe control functions
208  */
usbhsp_pipe_select(struct usbhs_pipe * pipe)209 static void usbhsp_pipe_select(struct usbhs_pipe *pipe)
210 {
211 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
212 
213 	/*
214 	 * On pipe, this is necessary before
215 	 * accesses to below registers.
216 	 *
217 	 * PIPESEL	: usbhsp_pipe_select
218 	 * PIPECFG	: usbhsp_pipe_cfg_xxx
219 	 * PIPEBUF	: usbhsp_pipe_buf_xxx
220 	 * PIPEMAXP	: usbhsp_pipe_maxp_xxx
221 	 * PIPEPERI
222 	 */
223 
224 	/*
225 	 * if pipe is dcp, no pipe is selected.
226 	 * it is no problem, because dcp have its register
227 	 */
228 	usbhs_write(priv, PIPESEL, 0xF & usbhs_pipe_number(pipe));
229 }
230 
usbhsp_pipe_barrier(struct usbhs_pipe * pipe)231 static int usbhsp_pipe_barrier(struct usbhs_pipe *pipe)
232 {
233 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
234 	int timeout = 1024;
235 	u16 mask = usbhs_mod_is_host(priv) ? (CSSTS | PID_MASK) : PID_MASK;
236 
237 	/*
238 	 * make sure....
239 	 *
240 	 * Modify these bits when CSSTS = 0, PID = NAK, and no pipe number is
241 	 * specified by the CURPIPE bits.
242 	 * When changing the setting of this bit after changing
243 	 * the PID bits for the selected pipe from BUF to NAK,
244 	 * check that CSSTS = 0 and PBUSY = 0.
245 	 */
246 
247 	/*
248 	 * CURPIPE bit = 0
249 	 *
250 	 * see also
251 	 *  "Operation"
252 	 *  - "Pipe Control"
253 	 *   - "Pipe Control Registers Switching Procedure"
254 	 */
255 	usbhs_write(priv, CFIFOSEL, 0);
256 	usbhs_pipe_disable(pipe);
257 
258 	do {
259 		if (!(usbhsp_pipectrl_get(pipe) & mask))
260 			return 0;
261 
262 		udelay(10);
263 
264 	} while (timeout--);
265 
266 	return -EBUSY;
267 }
268 
usbhs_pipe_is_accessible(struct usbhs_pipe * pipe)269 int usbhs_pipe_is_accessible(struct usbhs_pipe *pipe)
270 {
271 	u16 val;
272 
273 	val = usbhsp_pipectrl_get(pipe);
274 	if (val & BSTS)
275 		return 0;
276 
277 	return -EBUSY;
278 }
279 
usbhs_pipe_contains_transmittable_data(struct usbhs_pipe * pipe)280 bool usbhs_pipe_contains_transmittable_data(struct usbhs_pipe *pipe)
281 {
282 	u16 val;
283 
284 	/* Do not support for DCP pipe */
285 	if (usbhs_pipe_is_dcp(pipe))
286 		return false;
287 
288 	val = usbhsp_pipectrl_get(pipe);
289 	if (val & INBUFM)
290 		return true;
291 
292 	return false;
293 }
294 
295 /*
296  *		PID ctrl
297  */
__usbhsp_pid_try_nak_if_stall(struct usbhs_pipe * pipe)298 static void __usbhsp_pid_try_nak_if_stall(struct usbhs_pipe *pipe)
299 {
300 	u16 pid = usbhsp_pipectrl_get(pipe);
301 
302 	pid &= PID_MASK;
303 
304 	/*
305 	 * see
306 	 * "Pipe n Control Register" - "PID"
307 	 */
308 	switch (pid) {
309 	case PID_STALL11:
310 		usbhsp_pipectrl_set(pipe, PID_MASK, PID_STALL10);
311 		fallthrough;
312 	case PID_STALL10:
313 		usbhsp_pipectrl_set(pipe, PID_MASK, PID_NAK);
314 	}
315 }
316 
usbhs_pipe_disable(struct usbhs_pipe * pipe)317 void usbhs_pipe_disable(struct usbhs_pipe *pipe)
318 {
319 	int timeout = 1024;
320 	u16 val;
321 
322 	/* see "Pipe n Control Register" - "PID" */
323 	__usbhsp_pid_try_nak_if_stall(pipe);
324 
325 	usbhsp_pipectrl_set(pipe, PID_MASK, PID_NAK);
326 
327 	do {
328 		val  = usbhsp_pipectrl_get(pipe);
329 		val &= PBUSY;
330 		if (!val)
331 			break;
332 
333 		udelay(10);
334 	} while (timeout--);
335 }
336 
usbhs_pipe_enable(struct usbhs_pipe * pipe)337 void usbhs_pipe_enable(struct usbhs_pipe *pipe)
338 {
339 	/* see "Pipe n Control Register" - "PID" */
340 	__usbhsp_pid_try_nak_if_stall(pipe);
341 
342 	usbhsp_pipectrl_set(pipe, PID_MASK, PID_BUF);
343 }
344 
usbhs_pipe_stall(struct usbhs_pipe * pipe)345 void usbhs_pipe_stall(struct usbhs_pipe *pipe)
346 {
347 	u16 pid = usbhsp_pipectrl_get(pipe);
348 
349 	pid &= PID_MASK;
350 
351 	/*
352 	 * see
353 	 * "Pipe n Control Register" - "PID"
354 	 */
355 	switch (pid) {
356 	case PID_NAK:
357 		usbhsp_pipectrl_set(pipe, PID_MASK, PID_STALL10);
358 		break;
359 	case PID_BUF:
360 		usbhsp_pipectrl_set(pipe, PID_MASK, PID_STALL11);
361 		break;
362 	}
363 }
364 
usbhs_pipe_is_stall(struct usbhs_pipe * pipe)365 int usbhs_pipe_is_stall(struct usbhs_pipe *pipe)
366 {
367 	u16 pid = usbhsp_pipectrl_get(pipe) & PID_MASK;
368 
369 	return (int)(pid == PID_STALL10 || pid == PID_STALL11);
370 }
371 
usbhs_pipe_set_trans_count_if_bulk(struct usbhs_pipe * pipe,int len)372 void usbhs_pipe_set_trans_count_if_bulk(struct usbhs_pipe *pipe, int len)
373 {
374 	if (!usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK))
375 		return;
376 
377 	/*
378 	 * clear and disable transfer counter for IN/OUT pipe
379 	 */
380 	usbhsp_pipe_tre_set(pipe, TRCLR | TRENB, TRCLR);
381 
382 	/*
383 	 * Only IN direction bulk pipe can use transfer count.
384 	 * Without using this function,
385 	 * received data will break if it was large data size.
386 	 * see PIPEnTRN/PIPEnTRE for detail
387 	 */
388 	if (usbhs_pipe_is_dir_in(pipe)) {
389 		int maxp = usbhs_pipe_get_maxpacket(pipe);
390 
391 		usbhsp_pipe_trn_set(pipe, 0xffff, DIV_ROUND_UP(len, maxp));
392 		usbhsp_pipe_tre_set(pipe, TRENB, TRENB); /* enable */
393 	}
394 }
395 
396 
397 /*
398  *		pipe setup
399  */
usbhsp_setup_pipecfg(struct usbhs_pipe * pipe,int is_host,int dir_in,u16 * pipecfg)400 static int usbhsp_setup_pipecfg(struct usbhs_pipe *pipe, int is_host,
401 				int dir_in, u16 *pipecfg)
402 {
403 	u16 type = 0;
404 	u16 bfre = 0;
405 	u16 dblb = 0;
406 	u16 cntmd = 0;
407 	u16 dir = 0;
408 	u16 epnum = 0;
409 	u16 shtnak = 0;
410 	static const u16 type_array[] = {
411 		[USB_ENDPOINT_XFER_BULK] = TYPE_BULK,
412 		[USB_ENDPOINT_XFER_INT]  = TYPE_INT,
413 		[USB_ENDPOINT_XFER_ISOC] = TYPE_ISO,
414 	};
415 
416 	if (usbhs_pipe_is_dcp(pipe))
417 		return -EINVAL;
418 
419 	/*
420 	 * PIPECFG
421 	 *
422 	 * see
423 	 *  - "Register Descriptions" - "PIPECFG" register
424 	 *  - "Features"  - "Pipe configuration"
425 	 *  - "Operation" - "Pipe Control"
426 	 */
427 
428 	/* TYPE */
429 	type = type_array[usbhs_pipe_type(pipe)];
430 
431 	/* BFRE */
432 	if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC) ||
433 	    usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK))
434 		bfre = 0; /* FIXME */
435 
436 	/* DBLB: see usbhs_pipe_config_update() */
437 
438 	/* CNTMD */
439 	if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK))
440 		cntmd = 0; /* FIXME */
441 
442 	/* DIR */
443 	if (dir_in)
444 		usbhsp_flags_set(pipe, IS_DIR_HOST);
445 
446 	if (!!is_host ^ !!dir_in)
447 		dir |= DIR_OUT;
448 
449 	if (!dir)
450 		usbhsp_flags_set(pipe, IS_DIR_IN);
451 
452 	/* SHTNAK */
453 	if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK) &&
454 	    !dir)
455 		shtnak = SHTNAK;
456 
457 	/* EPNUM */
458 	epnum = 0; /* see usbhs_pipe_config_update() */
459 	*pipecfg = type		|
460 		   bfre		|
461 		   dblb		|
462 		   cntmd	|
463 		   dir		|
464 		   shtnak	|
465 		   epnum;
466 	return 0;
467 }
468 
usbhsp_setup_pipebuff(struct usbhs_pipe * pipe)469 static u16 usbhsp_setup_pipebuff(struct usbhs_pipe *pipe)
470 {
471 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
472 	struct device *dev = usbhs_priv_to_dev(priv);
473 	int pipe_num = usbhs_pipe_number(pipe);
474 	u16 buff_size;
475 	u16 bufnmb;
476 	u16 bufnmb_cnt;
477 	struct renesas_usbhs_driver_pipe_config *pipe_config =
478 					usbhsp_get_pipe_config(priv, pipe_num);
479 
480 	/*
481 	 * PIPEBUF
482 	 *
483 	 * see
484 	 *  - "Register Descriptions" - "PIPEBUF" register
485 	 *  - "Features"  - "Pipe configuration"
486 	 *  - "Operation" - "FIFO Buffer Memory"
487 	 *  - "Operation" - "Pipe Control"
488 	 */
489 	buff_size = pipe_config->bufsize;
490 	bufnmb = pipe_config->bufnum;
491 
492 	/* change buff_size to register value */
493 	bufnmb_cnt = (buff_size / 64) - 1;
494 
495 	dev_dbg(dev, "pipe : %d : buff_size 0x%x: bufnmb 0x%x\n",
496 		pipe_num, buff_size, bufnmb);
497 
498 	return	(0x1f & bufnmb_cnt)	<< 10 |
499 		(0xff & bufnmb)		<<  0;
500 }
501 
usbhs_pipe_config_update(struct usbhs_pipe * pipe,u16 devsel,u16 epnum,u16 maxp)502 void usbhs_pipe_config_update(struct usbhs_pipe *pipe, u16 devsel,
503 			      u16 epnum, u16 maxp)
504 {
505 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
506 	int pipe_num = usbhs_pipe_number(pipe);
507 	struct renesas_usbhs_driver_pipe_config *pipe_config =
508 					usbhsp_get_pipe_config(priv, pipe_num);
509 	u16 dblb = pipe_config->double_buf ? DBLB : 0;
510 
511 	if (devsel > 0xA) {
512 		struct device *dev = usbhs_priv_to_dev(priv);
513 
514 		dev_err(dev, "devsel error %d\n", devsel);
515 
516 		devsel = 0;
517 	}
518 
519 	usbhsp_pipe_barrier(pipe);
520 
521 	pipe->maxp = maxp;
522 
523 	usbhsp_pipe_select(pipe);
524 	usbhsp_pipe_maxp_set(pipe, 0xFFFF,
525 			     (devsel << 12) |
526 			     maxp);
527 
528 	if (!usbhs_pipe_is_dcp(pipe))
529 		usbhsp_pipe_cfg_set(pipe,  0x000F | DBLB, epnum | dblb);
530 }
531 
532 /*
533  *		pipe control
534  */
usbhs_pipe_get_maxpacket(struct usbhs_pipe * pipe)535 int usbhs_pipe_get_maxpacket(struct usbhs_pipe *pipe)
536 {
537 	/*
538 	 * see
539 	 *	usbhs_pipe_config_update()
540 	 *	usbhs_dcp_malloc()
541 	 */
542 	return pipe->maxp;
543 }
544 
usbhs_pipe_is_dir_in(struct usbhs_pipe * pipe)545 int usbhs_pipe_is_dir_in(struct usbhs_pipe *pipe)
546 {
547 	return usbhsp_flags_has(pipe, IS_DIR_IN);
548 }
549 
usbhs_pipe_is_dir_host(struct usbhs_pipe * pipe)550 int usbhs_pipe_is_dir_host(struct usbhs_pipe *pipe)
551 {
552 	return usbhsp_flags_has(pipe, IS_DIR_HOST);
553 }
554 
usbhs_pipe_is_running(struct usbhs_pipe * pipe)555 int usbhs_pipe_is_running(struct usbhs_pipe *pipe)
556 {
557 	return usbhsp_flags_has(pipe, IS_RUNNING);
558 }
559 
usbhs_pipe_running(struct usbhs_pipe * pipe,int running)560 void usbhs_pipe_running(struct usbhs_pipe *pipe, int running)
561 {
562 	if (running)
563 		usbhsp_flags_set(pipe, IS_RUNNING);
564 	else
565 		usbhsp_flags_clr(pipe, IS_RUNNING);
566 }
567 
usbhs_pipe_data_sequence(struct usbhs_pipe * pipe,int sequence)568 void usbhs_pipe_data_sequence(struct usbhs_pipe *pipe, int sequence)
569 {
570 	u16 mask = (SQCLR | SQSET);
571 	u16 val;
572 
573 	/*
574 	 * sequence
575 	 *  0  : data0
576 	 *  1  : data1
577 	 *  -1 : no change
578 	 */
579 	switch (sequence) {
580 	case 0:
581 		val = SQCLR;
582 		break;
583 	case 1:
584 		val = SQSET;
585 		break;
586 	default:
587 		return;
588 	}
589 
590 	usbhsp_pipectrl_set(pipe, mask, val);
591 }
592 
usbhs_pipe_get_data_sequence(struct usbhs_pipe * pipe)593 static int usbhs_pipe_get_data_sequence(struct usbhs_pipe *pipe)
594 {
595 	return !!(usbhsp_pipectrl_get(pipe) & SQMON);
596 }
597 
usbhs_pipe_clear(struct usbhs_pipe * pipe)598 void usbhs_pipe_clear(struct usbhs_pipe *pipe)
599 {
600 	if (usbhs_pipe_is_dcp(pipe)) {
601 		usbhs_fifo_clear_dcp(pipe);
602 	} else {
603 		usbhsp_pipectrl_set(pipe, ACLRM, ACLRM);
604 		usbhsp_pipectrl_set(pipe, ACLRM, 0);
605 	}
606 }
607 
608 /* Should call usbhsp_pipe_select() before */
usbhs_pipe_clear_without_sequence(struct usbhs_pipe * pipe,int needs_bfre,int bfre_enable)609 void usbhs_pipe_clear_without_sequence(struct usbhs_pipe *pipe,
610 				       int needs_bfre, int bfre_enable)
611 {
612 	int sequence;
613 
614 	usbhsp_pipe_select(pipe);
615 	sequence = usbhs_pipe_get_data_sequence(pipe);
616 	if (needs_bfre)
617 		usbhsp_pipe_cfg_set(pipe, BFRE, bfre_enable ? BFRE : 0);
618 	usbhs_pipe_clear(pipe);
619 	usbhs_pipe_data_sequence(pipe, sequence);
620 }
621 
usbhs_pipe_config_change_bfre(struct usbhs_pipe * pipe,int enable)622 void usbhs_pipe_config_change_bfre(struct usbhs_pipe *pipe, int enable)
623 {
624 	if (usbhs_pipe_is_dcp(pipe))
625 		return;
626 
627 	usbhsp_pipe_select(pipe);
628 	/* check if the driver needs to change the BFRE value */
629 	if (!(enable ^ !!(usbhsp_pipe_cfg_get(pipe) & BFRE)))
630 		return;
631 
632 	usbhs_pipe_clear_without_sequence(pipe, 1, enable);
633 }
634 
usbhsp_get_pipe(struct usbhs_priv * priv,u32 type)635 static struct usbhs_pipe *usbhsp_get_pipe(struct usbhs_priv *priv, u32 type)
636 {
637 	struct usbhs_pipe *pos, *pipe;
638 	int i;
639 
640 	/*
641 	 * find target pipe
642 	 */
643 	pipe = NULL;
644 	usbhs_for_each_pipe_with_dcp(pos, priv, i) {
645 		if (!usbhs_pipe_type_is(pos, type))
646 			continue;
647 		if (usbhsp_flags_has(pos, IS_USED))
648 			continue;
649 
650 		pipe = pos;
651 		break;
652 	}
653 
654 	if (!pipe)
655 		return NULL;
656 
657 	/*
658 	 * initialize pipe flags
659 	 */
660 	usbhsp_flags_init(pipe);
661 	usbhsp_flags_set(pipe, IS_USED);
662 
663 	return pipe;
664 }
665 
usbhsp_put_pipe(struct usbhs_pipe * pipe)666 static void usbhsp_put_pipe(struct usbhs_pipe *pipe)
667 {
668 	usbhsp_flags_init(pipe);
669 }
670 
usbhs_pipe_init(struct usbhs_priv * priv,int (* dma_map_ctrl)(struct device * dma_dev,struct usbhs_pkt * pkt,int map))671 void usbhs_pipe_init(struct usbhs_priv *priv,
672 		     int (*dma_map_ctrl)(struct device *dma_dev,
673 					 struct usbhs_pkt *pkt, int map))
674 {
675 	struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
676 	struct usbhs_pipe *pipe;
677 	int i;
678 
679 	usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
680 		usbhsp_flags_init(pipe);
681 		pipe->fifo = NULL;
682 		pipe->mod_private = NULL;
683 		INIT_LIST_HEAD(&pipe->list);
684 
685 		/* pipe force init */
686 		usbhs_pipe_clear(pipe);
687 	}
688 
689 	info->dma_map_ctrl = dma_map_ctrl;
690 }
691 
usbhs_pipe_malloc(struct usbhs_priv * priv,int endpoint_type,int dir_in)692 struct usbhs_pipe *usbhs_pipe_malloc(struct usbhs_priv *priv,
693 				     int endpoint_type,
694 				     int dir_in)
695 {
696 	struct device *dev = usbhs_priv_to_dev(priv);
697 	struct usbhs_pipe *pipe;
698 	int is_host = usbhs_mod_is_host(priv);
699 	int ret;
700 	u16 pipecfg, pipebuf;
701 
702 	pipe = usbhsp_get_pipe(priv, endpoint_type);
703 	if (!pipe) {
704 		dev_err(dev, "can't get pipe (%s)\n",
705 			usbhsp_pipe_name[endpoint_type]);
706 		return NULL;
707 	}
708 
709 	INIT_LIST_HEAD(&pipe->list);
710 
711 	usbhs_pipe_disable(pipe);
712 
713 	/* make sure pipe is not busy */
714 	ret = usbhsp_pipe_barrier(pipe);
715 	if (ret < 0) {
716 		dev_err(dev, "pipe setup failed %d\n", usbhs_pipe_number(pipe));
717 		return NULL;
718 	}
719 
720 	if (usbhsp_setup_pipecfg(pipe, is_host, dir_in, &pipecfg)) {
721 		dev_err(dev, "can't setup pipe\n");
722 		return NULL;
723 	}
724 
725 	pipebuf  = usbhsp_setup_pipebuff(pipe);
726 
727 	usbhsp_pipe_select(pipe);
728 	usbhsp_pipe_cfg_set(pipe, 0xFFFF, pipecfg);
729 	usbhsp_pipe_buf_set(pipe, 0xFFFF, pipebuf);
730 	usbhs_pipe_clear(pipe);
731 
732 	usbhs_pipe_sequence_data0(pipe);
733 
734 	dev_dbg(dev, "enable pipe %d : %s (%s)\n",
735 		usbhs_pipe_number(pipe),
736 		usbhs_pipe_name(pipe),
737 		usbhs_pipe_is_dir_in(pipe) ? "in" : "out");
738 
739 	/*
740 	 * epnum / maxp are still not set to this pipe.
741 	 * call usbhs_pipe_config_update() after this function !!
742 	 */
743 
744 	return pipe;
745 }
746 
usbhs_pipe_free(struct usbhs_pipe * pipe)747 void usbhs_pipe_free(struct usbhs_pipe *pipe)
748 {
749 	usbhsp_pipe_select(pipe);
750 	usbhsp_pipe_cfg_set(pipe, 0xFFFF, 0);
751 	usbhsp_put_pipe(pipe);
752 }
753 
usbhs_pipe_select_fifo(struct usbhs_pipe * pipe,struct usbhs_fifo * fifo)754 void usbhs_pipe_select_fifo(struct usbhs_pipe *pipe, struct usbhs_fifo *fifo)
755 {
756 	if (pipe->fifo)
757 		pipe->fifo->pipe = NULL;
758 
759 	pipe->fifo = fifo;
760 
761 	if (fifo)
762 		fifo->pipe = pipe;
763 }
764 
765 
766 /*
767  *		dcp control
768  */
usbhs_dcp_malloc(struct usbhs_priv * priv)769 struct usbhs_pipe *usbhs_dcp_malloc(struct usbhs_priv *priv)
770 {
771 	struct usbhs_pipe *pipe;
772 
773 	pipe = usbhsp_get_pipe(priv, USB_ENDPOINT_XFER_CONTROL);
774 	if (!pipe)
775 		return NULL;
776 
777 	INIT_LIST_HEAD(&pipe->list);
778 
779 	/*
780 	 * call usbhs_pipe_config_update() after this function !!
781 	 */
782 
783 	return pipe;
784 }
785 
usbhs_dcp_control_transfer_done(struct usbhs_pipe * pipe)786 void usbhs_dcp_control_transfer_done(struct usbhs_pipe *pipe)
787 {
788 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
789 
790 	WARN_ON(!usbhs_pipe_is_dcp(pipe));
791 
792 	usbhs_pipe_enable(pipe);
793 
794 	if (!usbhs_mod_is_host(priv)) /* funconly */
795 		usbhsp_pipectrl_set(pipe, CCPL, CCPL);
796 }
797 
usbhs_dcp_dir_for_host(struct usbhs_pipe * pipe,int dir_out)798 void usbhs_dcp_dir_for_host(struct usbhs_pipe *pipe, int dir_out)
799 {
800 	usbhsp_pipe_cfg_set(pipe, DIR_OUT,
801 			    dir_out ? DIR_OUT : 0);
802 }
803 
804 /*
805  *		pipe module function
806  */
usbhs_pipe_probe(struct usbhs_priv * priv)807 int usbhs_pipe_probe(struct usbhs_priv *priv)
808 {
809 	struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
810 	struct usbhs_pipe *pipe;
811 	struct device *dev = usbhs_priv_to_dev(priv);
812 	struct renesas_usbhs_driver_pipe_config *pipe_configs =
813 					usbhs_get_dparam(priv, pipe_configs);
814 	int pipe_size = usbhs_get_dparam(priv, pipe_size);
815 	int i;
816 
817 	/* This driver expects 1st pipe is DCP */
818 	if (pipe_configs[0].type != USB_ENDPOINT_XFER_CONTROL) {
819 		dev_err(dev, "1st PIPE is not DCP\n");
820 		return -EINVAL;
821 	}
822 
823 	info->pipe = kcalloc(pipe_size, sizeof(struct usbhs_pipe),
824 			     GFP_KERNEL);
825 	if (!info->pipe)
826 		return -ENOMEM;
827 
828 	info->size = pipe_size;
829 
830 	/*
831 	 * init pipe
832 	 */
833 	usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
834 		pipe->priv = priv;
835 
836 		usbhs_pipe_type(pipe) =
837 			pipe_configs[i].type & USB_ENDPOINT_XFERTYPE_MASK;
838 
839 		dev_dbg(dev, "pipe %x\t: %s\n",
840 			i, usbhsp_pipe_name[pipe_configs[i].type]);
841 	}
842 
843 	return 0;
844 }
845 
usbhs_pipe_remove(struct usbhs_priv * priv)846 void usbhs_pipe_remove(struct usbhs_priv *priv)
847 {
848 	struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
849 
850 	kfree(info->pipe);
851 }
852