1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * R8A66597 UDC (USB gadget)
4  *
5  * Copyright (C) 2006-2009 Renesas Solutions Corp.
6  *
7  * Author : Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/interrupt.h>
12 #include <linux/delay.h>
13 #include <linux/io.h>
14 #include <linux/platform_device.h>
15 #include <linux/clk.h>
16 #include <linux/err.h>
17 #include <linux/slab.h>
18 #include <linux/dma-mapping.h>
19 
20 #include <linux/usb/ch9.h>
21 #include <linux/usb/gadget.h>
22 
23 #include "r8a66597-udc.h"
24 
25 #define DRIVER_VERSION	"2011-09-26"
26 
27 static const char udc_name[] = "r8a66597_udc";
28 static const char *r8a66597_ep_name[] = {
29 	"ep0", "ep1", "ep2", "ep3", "ep4", "ep5", "ep6", "ep7",
30 	"ep8", "ep9",
31 };
32 
33 static void init_controller(struct r8a66597 *r8a66597);
34 static void disable_controller(struct r8a66597 *r8a66597);
35 static void irq_ep0_write(struct r8a66597_ep *ep, struct r8a66597_request *req);
36 static void irq_packet_write(struct r8a66597_ep *ep,
37 				struct r8a66597_request *req);
38 static int r8a66597_queue(struct usb_ep *_ep, struct usb_request *_req,
39 			gfp_t gfp_flags);
40 
41 static void transfer_complete(struct r8a66597_ep *ep,
42 		struct r8a66597_request *req, int status);
43 
44 /*-------------------------------------------------------------------------*/
get_usb_speed(struct r8a66597 * r8a66597)45 static inline u16 get_usb_speed(struct r8a66597 *r8a66597)
46 {
47 	return r8a66597_read(r8a66597, DVSTCTR0) & RHST;
48 }
49 
enable_pipe_irq(struct r8a66597 * r8a66597,u16 pipenum,unsigned long reg)50 static void enable_pipe_irq(struct r8a66597 *r8a66597, u16 pipenum,
51 		unsigned long reg)
52 {
53 	u16 tmp;
54 
55 	tmp = r8a66597_read(r8a66597, INTENB0);
56 	r8a66597_bclr(r8a66597, BEMPE | NRDYE | BRDYE,
57 			INTENB0);
58 	r8a66597_bset(r8a66597, (1 << pipenum), reg);
59 	r8a66597_write(r8a66597, tmp, INTENB0);
60 }
61 
disable_pipe_irq(struct r8a66597 * r8a66597,u16 pipenum,unsigned long reg)62 static void disable_pipe_irq(struct r8a66597 *r8a66597, u16 pipenum,
63 		unsigned long reg)
64 {
65 	u16 tmp;
66 
67 	tmp = r8a66597_read(r8a66597, INTENB0);
68 	r8a66597_bclr(r8a66597, BEMPE | NRDYE | BRDYE,
69 			INTENB0);
70 	r8a66597_bclr(r8a66597, (1 << pipenum), reg);
71 	r8a66597_write(r8a66597, tmp, INTENB0);
72 }
73 
r8a66597_usb_connect(struct r8a66597 * r8a66597)74 static void r8a66597_usb_connect(struct r8a66597 *r8a66597)
75 {
76 	r8a66597_bset(r8a66597, CTRE, INTENB0);
77 	r8a66597_bset(r8a66597, BEMPE | BRDYE, INTENB0);
78 
79 	r8a66597_bset(r8a66597, DPRPU, SYSCFG0);
80 }
81 
r8a66597_usb_disconnect(struct r8a66597 * r8a66597)82 static void r8a66597_usb_disconnect(struct r8a66597 *r8a66597)
83 __releases(r8a66597->lock)
84 __acquires(r8a66597->lock)
85 {
86 	r8a66597_bclr(r8a66597, CTRE, INTENB0);
87 	r8a66597_bclr(r8a66597, BEMPE | BRDYE, INTENB0);
88 	r8a66597_bclr(r8a66597, DPRPU, SYSCFG0);
89 
90 	r8a66597->gadget.speed = USB_SPEED_UNKNOWN;
91 	spin_unlock(&r8a66597->lock);
92 	r8a66597->driver->disconnect(&r8a66597->gadget);
93 	spin_lock(&r8a66597->lock);
94 
95 	disable_controller(r8a66597);
96 	init_controller(r8a66597);
97 	r8a66597_bset(r8a66597, VBSE, INTENB0);
98 	INIT_LIST_HEAD(&r8a66597->ep[0].queue);
99 }
100 
control_reg_get_pid(struct r8a66597 * r8a66597,u16 pipenum)101 static inline u16 control_reg_get_pid(struct r8a66597 *r8a66597, u16 pipenum)
102 {
103 	u16 pid = 0;
104 	unsigned long offset;
105 
106 	if (pipenum == 0) {
107 		pid = r8a66597_read(r8a66597, DCPCTR) & PID;
108 	} else if (pipenum < R8A66597_MAX_NUM_PIPE) {
109 		offset = get_pipectr_addr(pipenum);
110 		pid = r8a66597_read(r8a66597, offset) & PID;
111 	} else {
112 		dev_err(r8a66597_to_dev(r8a66597), "unexpect pipe num (%d)\n",
113 			pipenum);
114 	}
115 
116 	return pid;
117 }
118 
control_reg_set_pid(struct r8a66597 * r8a66597,u16 pipenum,u16 pid)119 static inline void control_reg_set_pid(struct r8a66597 *r8a66597, u16 pipenum,
120 		u16 pid)
121 {
122 	unsigned long offset;
123 
124 	if (pipenum == 0) {
125 		r8a66597_mdfy(r8a66597, pid, PID, DCPCTR);
126 	} else if (pipenum < R8A66597_MAX_NUM_PIPE) {
127 		offset = get_pipectr_addr(pipenum);
128 		r8a66597_mdfy(r8a66597, pid, PID, offset);
129 	} else {
130 		dev_err(r8a66597_to_dev(r8a66597), "unexpect pipe num (%d)\n",
131 			pipenum);
132 	}
133 }
134 
pipe_start(struct r8a66597 * r8a66597,u16 pipenum)135 static inline void pipe_start(struct r8a66597 *r8a66597, u16 pipenum)
136 {
137 	control_reg_set_pid(r8a66597, pipenum, PID_BUF);
138 }
139 
pipe_stop(struct r8a66597 * r8a66597,u16 pipenum)140 static inline void pipe_stop(struct r8a66597 *r8a66597, u16 pipenum)
141 {
142 	control_reg_set_pid(r8a66597, pipenum, PID_NAK);
143 }
144 
pipe_stall(struct r8a66597 * r8a66597,u16 pipenum)145 static inline void pipe_stall(struct r8a66597 *r8a66597, u16 pipenum)
146 {
147 	control_reg_set_pid(r8a66597, pipenum, PID_STALL);
148 }
149 
control_reg_get(struct r8a66597 * r8a66597,u16 pipenum)150 static inline u16 control_reg_get(struct r8a66597 *r8a66597, u16 pipenum)
151 {
152 	u16 ret = 0;
153 	unsigned long offset;
154 
155 	if (pipenum == 0) {
156 		ret = r8a66597_read(r8a66597, DCPCTR);
157 	} else if (pipenum < R8A66597_MAX_NUM_PIPE) {
158 		offset = get_pipectr_addr(pipenum);
159 		ret = r8a66597_read(r8a66597, offset);
160 	} else {
161 		dev_err(r8a66597_to_dev(r8a66597), "unexpect pipe num (%d)\n",
162 			pipenum);
163 	}
164 
165 	return ret;
166 }
167 
control_reg_sqclr(struct r8a66597 * r8a66597,u16 pipenum)168 static inline void control_reg_sqclr(struct r8a66597 *r8a66597, u16 pipenum)
169 {
170 	unsigned long offset;
171 
172 	pipe_stop(r8a66597, pipenum);
173 
174 	if (pipenum == 0) {
175 		r8a66597_bset(r8a66597, SQCLR, DCPCTR);
176 	} else if (pipenum < R8A66597_MAX_NUM_PIPE) {
177 		offset = get_pipectr_addr(pipenum);
178 		r8a66597_bset(r8a66597, SQCLR, offset);
179 	} else {
180 		dev_err(r8a66597_to_dev(r8a66597), "unexpect pipe num (%d)\n",
181 			pipenum);
182 	}
183 }
184 
control_reg_sqset(struct r8a66597 * r8a66597,u16 pipenum)185 static void control_reg_sqset(struct r8a66597 *r8a66597, u16 pipenum)
186 {
187 	unsigned long offset;
188 
189 	pipe_stop(r8a66597, pipenum);
190 
191 	if (pipenum == 0) {
192 		r8a66597_bset(r8a66597, SQSET, DCPCTR);
193 	} else if (pipenum < R8A66597_MAX_NUM_PIPE) {
194 		offset = get_pipectr_addr(pipenum);
195 		r8a66597_bset(r8a66597, SQSET, offset);
196 	} else {
197 		dev_err(r8a66597_to_dev(r8a66597),
198 			"unexpect pipe num(%d)\n", pipenum);
199 	}
200 }
201 
control_reg_sqmon(struct r8a66597 * r8a66597,u16 pipenum)202 static u16 control_reg_sqmon(struct r8a66597 *r8a66597, u16 pipenum)
203 {
204 	unsigned long offset;
205 
206 	if (pipenum == 0) {
207 		return r8a66597_read(r8a66597, DCPCTR) & SQMON;
208 	} else if (pipenum < R8A66597_MAX_NUM_PIPE) {
209 		offset = get_pipectr_addr(pipenum);
210 		return r8a66597_read(r8a66597, offset) & SQMON;
211 	} else {
212 		dev_err(r8a66597_to_dev(r8a66597),
213 			"unexpect pipe num(%d)\n", pipenum);
214 	}
215 
216 	return 0;
217 }
218 
save_usb_toggle(struct r8a66597 * r8a66597,u16 pipenum)219 static u16 save_usb_toggle(struct r8a66597 *r8a66597, u16 pipenum)
220 {
221 	return control_reg_sqmon(r8a66597, pipenum);
222 }
223 
restore_usb_toggle(struct r8a66597 * r8a66597,u16 pipenum,u16 toggle)224 static void restore_usb_toggle(struct r8a66597 *r8a66597, u16 pipenum,
225 			       u16 toggle)
226 {
227 	if (toggle)
228 		control_reg_sqset(r8a66597, pipenum);
229 	else
230 		control_reg_sqclr(r8a66597, pipenum);
231 }
232 
get_buffer_size(struct r8a66597 * r8a66597,u16 pipenum)233 static inline int get_buffer_size(struct r8a66597 *r8a66597, u16 pipenum)
234 {
235 	u16 tmp;
236 	int size;
237 
238 	if (pipenum == 0) {
239 		tmp = r8a66597_read(r8a66597, DCPCFG);
240 		if ((tmp & R8A66597_CNTMD) != 0)
241 			size = 256;
242 		else {
243 			tmp = r8a66597_read(r8a66597, DCPMAXP);
244 			size = tmp & MAXP;
245 		}
246 	} else {
247 		r8a66597_write(r8a66597, pipenum, PIPESEL);
248 		tmp = r8a66597_read(r8a66597, PIPECFG);
249 		if ((tmp & R8A66597_CNTMD) != 0) {
250 			tmp = r8a66597_read(r8a66597, PIPEBUF);
251 			size = ((tmp >> 10) + 1) * 64;
252 		} else {
253 			tmp = r8a66597_read(r8a66597, PIPEMAXP);
254 			size = tmp & MXPS;
255 		}
256 	}
257 
258 	return size;
259 }
260 
mbw_value(struct r8a66597 * r8a66597)261 static inline unsigned short mbw_value(struct r8a66597 *r8a66597)
262 {
263 	if (r8a66597->pdata->on_chip)
264 		return MBW_32;
265 	else
266 		return MBW_16;
267 }
268 
r8a66597_change_curpipe(struct r8a66597 * r8a66597,u16 pipenum,u16 isel,u16 fifosel)269 static void r8a66597_change_curpipe(struct r8a66597 *r8a66597, u16 pipenum,
270 				    u16 isel, u16 fifosel)
271 {
272 	u16 tmp, mask, loop;
273 	int i = 0;
274 
275 	if (!pipenum) {
276 		mask = ISEL | CURPIPE;
277 		loop = isel;
278 	} else {
279 		mask = CURPIPE;
280 		loop = pipenum;
281 	}
282 	r8a66597_mdfy(r8a66597, loop, mask, fifosel);
283 
284 	do {
285 		tmp = r8a66597_read(r8a66597, fifosel);
286 		if (i++ > 1000000) {
287 			dev_err(r8a66597_to_dev(r8a66597),
288 				"r8a66597: register%x, loop %x "
289 				"is timeout\n", fifosel, loop);
290 			break;
291 		}
292 		ndelay(1);
293 	} while ((tmp & mask) != loop);
294 }
295 
pipe_change(struct r8a66597 * r8a66597,u16 pipenum)296 static void pipe_change(struct r8a66597 *r8a66597, u16 pipenum)
297 {
298 	struct r8a66597_ep *ep = r8a66597->pipenum2ep[pipenum];
299 
300 	if (ep->use_dma)
301 		r8a66597_bclr(r8a66597, DREQE, ep->fifosel);
302 
303 	r8a66597_mdfy(r8a66597, pipenum, CURPIPE, ep->fifosel);
304 
305 	ndelay(450);
306 
307 	if (r8a66597_is_sudmac(r8a66597) && ep->use_dma)
308 		r8a66597_bclr(r8a66597, mbw_value(r8a66597), ep->fifosel);
309 	else
310 		r8a66597_bset(r8a66597, mbw_value(r8a66597), ep->fifosel);
311 
312 	if (ep->use_dma)
313 		r8a66597_bset(r8a66597, DREQE, ep->fifosel);
314 }
315 
pipe_buffer_setting(struct r8a66597 * r8a66597,struct r8a66597_pipe_info * info)316 static int pipe_buffer_setting(struct r8a66597 *r8a66597,
317 		struct r8a66597_pipe_info *info)
318 {
319 	u16 bufnum = 0, buf_bsize = 0;
320 	u16 pipecfg = 0;
321 
322 	if (info->pipe == 0)
323 		return -EINVAL;
324 
325 	r8a66597_write(r8a66597, info->pipe, PIPESEL);
326 
327 	if (info->dir_in)
328 		pipecfg |= R8A66597_DIR;
329 	pipecfg |= info->type;
330 	pipecfg |= info->epnum;
331 	switch (info->type) {
332 	case R8A66597_INT:
333 		bufnum = 4 + (info->pipe - R8A66597_BASE_PIPENUM_INT);
334 		buf_bsize = 0;
335 		break;
336 	case R8A66597_BULK:
337 		/* isochronous pipes may be used as bulk pipes */
338 		if (info->pipe >= R8A66597_BASE_PIPENUM_BULK)
339 			bufnum = info->pipe - R8A66597_BASE_PIPENUM_BULK;
340 		else
341 			bufnum = info->pipe - R8A66597_BASE_PIPENUM_ISOC;
342 
343 		bufnum = R8A66597_BASE_BUFNUM + (bufnum * 16);
344 		buf_bsize = 7;
345 		pipecfg |= R8A66597_DBLB;
346 		if (!info->dir_in)
347 			pipecfg |= R8A66597_SHTNAK;
348 		break;
349 	case R8A66597_ISO:
350 		bufnum = R8A66597_BASE_BUFNUM +
351 			 (info->pipe - R8A66597_BASE_PIPENUM_ISOC) * 16;
352 		buf_bsize = 7;
353 		break;
354 	}
355 
356 	if (buf_bsize && ((bufnum + 16) >= R8A66597_MAX_BUFNUM)) {
357 		pr_err("r8a66597 pipe memory is insufficient\n");
358 		return -ENOMEM;
359 	}
360 
361 	r8a66597_write(r8a66597, pipecfg, PIPECFG);
362 	r8a66597_write(r8a66597, (buf_bsize << 10) | (bufnum), PIPEBUF);
363 	r8a66597_write(r8a66597, info->maxpacket, PIPEMAXP);
364 	if (info->interval)
365 		info->interval--;
366 	r8a66597_write(r8a66597, info->interval, PIPEPERI);
367 
368 	return 0;
369 }
370 
pipe_buffer_release(struct r8a66597 * r8a66597,struct r8a66597_pipe_info * info)371 static void pipe_buffer_release(struct r8a66597 *r8a66597,
372 				struct r8a66597_pipe_info *info)
373 {
374 	if (info->pipe == 0)
375 		return;
376 
377 	if (is_bulk_pipe(info->pipe)) {
378 		r8a66597->bulk--;
379 	} else if (is_interrupt_pipe(info->pipe)) {
380 		r8a66597->interrupt--;
381 	} else if (is_isoc_pipe(info->pipe)) {
382 		r8a66597->isochronous--;
383 		if (info->type == R8A66597_BULK)
384 			r8a66597->bulk--;
385 	} else {
386 		dev_err(r8a66597_to_dev(r8a66597),
387 			"ep_release: unexpect pipenum (%d)\n", info->pipe);
388 	}
389 }
390 
pipe_initialize(struct r8a66597_ep * ep)391 static void pipe_initialize(struct r8a66597_ep *ep)
392 {
393 	struct r8a66597 *r8a66597 = ep->r8a66597;
394 
395 	r8a66597_mdfy(r8a66597, 0, CURPIPE, ep->fifosel);
396 
397 	r8a66597_write(r8a66597, ACLRM, ep->pipectr);
398 	r8a66597_write(r8a66597, 0, ep->pipectr);
399 	r8a66597_write(r8a66597, SQCLR, ep->pipectr);
400 	if (ep->use_dma) {
401 		r8a66597_mdfy(r8a66597, ep->pipenum, CURPIPE, ep->fifosel);
402 
403 		ndelay(450);
404 
405 		r8a66597_bset(r8a66597, mbw_value(r8a66597), ep->fifosel);
406 	}
407 }
408 
r8a66597_ep_setting(struct r8a66597 * r8a66597,struct r8a66597_ep * ep,const struct usb_endpoint_descriptor * desc,u16 pipenum,int dma)409 static void r8a66597_ep_setting(struct r8a66597 *r8a66597,
410 				struct r8a66597_ep *ep,
411 				const struct usb_endpoint_descriptor *desc,
412 				u16 pipenum, int dma)
413 {
414 	ep->use_dma = 0;
415 	ep->fifoaddr = CFIFO;
416 	ep->fifosel = CFIFOSEL;
417 	ep->fifoctr = CFIFOCTR;
418 
419 	ep->pipectr = get_pipectr_addr(pipenum);
420 	if (is_bulk_pipe(pipenum) || is_isoc_pipe(pipenum)) {
421 		ep->pipetre = get_pipetre_addr(pipenum);
422 		ep->pipetrn = get_pipetrn_addr(pipenum);
423 	} else {
424 		ep->pipetre = 0;
425 		ep->pipetrn = 0;
426 	}
427 	ep->pipenum = pipenum;
428 	ep->ep.maxpacket = usb_endpoint_maxp(desc);
429 	r8a66597->pipenum2ep[pipenum] = ep;
430 	r8a66597->epaddr2ep[usb_endpoint_num(desc)]
431 		= ep;
432 	INIT_LIST_HEAD(&ep->queue);
433 }
434 
r8a66597_ep_release(struct r8a66597_ep * ep)435 static void r8a66597_ep_release(struct r8a66597_ep *ep)
436 {
437 	struct r8a66597 *r8a66597 = ep->r8a66597;
438 	u16 pipenum = ep->pipenum;
439 
440 	if (pipenum == 0)
441 		return;
442 
443 	if (ep->use_dma)
444 		r8a66597->num_dma--;
445 	ep->pipenum = 0;
446 	ep->busy = 0;
447 	ep->use_dma = 0;
448 }
449 
alloc_pipe_config(struct r8a66597_ep * ep,const struct usb_endpoint_descriptor * desc)450 static int alloc_pipe_config(struct r8a66597_ep *ep,
451 		const struct usb_endpoint_descriptor *desc)
452 {
453 	struct r8a66597 *r8a66597 = ep->r8a66597;
454 	struct r8a66597_pipe_info info;
455 	int dma = 0;
456 	unsigned char *counter;
457 	int ret;
458 
459 	ep->ep.desc = desc;
460 
461 	if (ep->pipenum)	/* already allocated pipe  */
462 		return 0;
463 
464 	switch (usb_endpoint_type(desc)) {
465 	case USB_ENDPOINT_XFER_BULK:
466 		if (r8a66597->bulk >= R8A66597_MAX_NUM_BULK) {
467 			if (r8a66597->isochronous >= R8A66597_MAX_NUM_ISOC) {
468 				dev_err(r8a66597_to_dev(r8a66597),
469 					"bulk pipe is insufficient\n");
470 				return -ENODEV;
471 			} else {
472 				info.pipe = R8A66597_BASE_PIPENUM_ISOC
473 						+ r8a66597->isochronous;
474 				counter = &r8a66597->isochronous;
475 			}
476 		} else {
477 			info.pipe = R8A66597_BASE_PIPENUM_BULK + r8a66597->bulk;
478 			counter = &r8a66597->bulk;
479 		}
480 		info.type = R8A66597_BULK;
481 		dma = 1;
482 		break;
483 	case USB_ENDPOINT_XFER_INT:
484 		if (r8a66597->interrupt >= R8A66597_MAX_NUM_INT) {
485 			dev_err(r8a66597_to_dev(r8a66597),
486 				"interrupt pipe is insufficient\n");
487 			return -ENODEV;
488 		}
489 		info.pipe = R8A66597_BASE_PIPENUM_INT + r8a66597->interrupt;
490 		info.type = R8A66597_INT;
491 		counter = &r8a66597->interrupt;
492 		break;
493 	case USB_ENDPOINT_XFER_ISOC:
494 		if (r8a66597->isochronous >= R8A66597_MAX_NUM_ISOC) {
495 			dev_err(r8a66597_to_dev(r8a66597),
496 				"isochronous pipe is insufficient\n");
497 			return -ENODEV;
498 		}
499 		info.pipe = R8A66597_BASE_PIPENUM_ISOC + r8a66597->isochronous;
500 		info.type = R8A66597_ISO;
501 		counter = &r8a66597->isochronous;
502 		break;
503 	default:
504 		dev_err(r8a66597_to_dev(r8a66597), "unexpect xfer type\n");
505 		return -EINVAL;
506 	}
507 	ep->type = info.type;
508 
509 	info.epnum = usb_endpoint_num(desc);
510 	info.maxpacket = usb_endpoint_maxp(desc);
511 	info.interval = desc->bInterval;
512 	if (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
513 		info.dir_in = 1;
514 	else
515 		info.dir_in = 0;
516 
517 	ret = pipe_buffer_setting(r8a66597, &info);
518 	if (ret < 0) {
519 		dev_err(r8a66597_to_dev(r8a66597),
520 			"pipe_buffer_setting fail\n");
521 		return ret;
522 	}
523 
524 	(*counter)++;
525 	if ((counter == &r8a66597->isochronous) && info.type == R8A66597_BULK)
526 		r8a66597->bulk++;
527 
528 	r8a66597_ep_setting(r8a66597, ep, desc, info.pipe, dma);
529 	pipe_initialize(ep);
530 
531 	return 0;
532 }
533 
free_pipe_config(struct r8a66597_ep * ep)534 static int free_pipe_config(struct r8a66597_ep *ep)
535 {
536 	struct r8a66597 *r8a66597 = ep->r8a66597;
537 	struct r8a66597_pipe_info info;
538 
539 	info.pipe = ep->pipenum;
540 	info.type = ep->type;
541 	pipe_buffer_release(r8a66597, &info);
542 	r8a66597_ep_release(ep);
543 
544 	return 0;
545 }
546 
547 /*-------------------------------------------------------------------------*/
pipe_irq_enable(struct r8a66597 * r8a66597,u16 pipenum)548 static void pipe_irq_enable(struct r8a66597 *r8a66597, u16 pipenum)
549 {
550 	enable_irq_ready(r8a66597, pipenum);
551 	enable_irq_nrdy(r8a66597, pipenum);
552 }
553 
pipe_irq_disable(struct r8a66597 * r8a66597,u16 pipenum)554 static void pipe_irq_disable(struct r8a66597 *r8a66597, u16 pipenum)
555 {
556 	disable_irq_ready(r8a66597, pipenum);
557 	disable_irq_nrdy(r8a66597, pipenum);
558 }
559 
560 /* if complete is true, gadget driver complete function is not call */
control_end(struct r8a66597 * r8a66597,unsigned ccpl)561 static void control_end(struct r8a66597 *r8a66597, unsigned ccpl)
562 {
563 	r8a66597->ep[0].internal_ccpl = ccpl;
564 	pipe_start(r8a66597, 0);
565 	r8a66597_bset(r8a66597, CCPL, DCPCTR);
566 }
567 
start_ep0_write(struct r8a66597_ep * ep,struct r8a66597_request * req)568 static void start_ep0_write(struct r8a66597_ep *ep,
569 				struct r8a66597_request *req)
570 {
571 	struct r8a66597 *r8a66597 = ep->r8a66597;
572 
573 	pipe_change(r8a66597, ep->pipenum);
574 	r8a66597_mdfy(r8a66597, ISEL, (ISEL | CURPIPE), CFIFOSEL);
575 	r8a66597_write(r8a66597, BCLR, ep->fifoctr);
576 	if (req->req.length == 0) {
577 		r8a66597_bset(r8a66597, BVAL, ep->fifoctr);
578 		pipe_start(r8a66597, 0);
579 		transfer_complete(ep, req, 0);
580 	} else {
581 		r8a66597_write(r8a66597, ~BEMP0, BEMPSTS);
582 		irq_ep0_write(ep, req);
583 	}
584 }
585 
disable_fifosel(struct r8a66597 * r8a66597,u16 pipenum,u16 fifosel)586 static void disable_fifosel(struct r8a66597 *r8a66597, u16 pipenum,
587 			    u16 fifosel)
588 {
589 	u16 tmp;
590 
591 	tmp = r8a66597_read(r8a66597, fifosel) & CURPIPE;
592 	if (tmp == pipenum)
593 		r8a66597_change_curpipe(r8a66597, 0, 0, fifosel);
594 }
595 
change_bfre_mode(struct r8a66597 * r8a66597,u16 pipenum,int enable)596 static void change_bfre_mode(struct r8a66597 *r8a66597, u16 pipenum,
597 			     int enable)
598 {
599 	struct r8a66597_ep *ep = r8a66597->pipenum2ep[pipenum];
600 	u16 tmp, toggle;
601 
602 	/* check current BFRE bit */
603 	r8a66597_write(r8a66597, pipenum, PIPESEL);
604 	tmp = r8a66597_read(r8a66597, PIPECFG) & R8A66597_BFRE;
605 	if ((enable && tmp) || (!enable && !tmp))
606 		return;
607 
608 	/* change BFRE bit */
609 	pipe_stop(r8a66597, pipenum);
610 	disable_fifosel(r8a66597, pipenum, CFIFOSEL);
611 	disable_fifosel(r8a66597, pipenum, D0FIFOSEL);
612 	disable_fifosel(r8a66597, pipenum, D1FIFOSEL);
613 
614 	toggle = save_usb_toggle(r8a66597, pipenum);
615 
616 	r8a66597_write(r8a66597, pipenum, PIPESEL);
617 	if (enable)
618 		r8a66597_bset(r8a66597, R8A66597_BFRE, PIPECFG);
619 	else
620 		r8a66597_bclr(r8a66597, R8A66597_BFRE, PIPECFG);
621 
622 	/* initialize for internal BFRE flag */
623 	r8a66597_bset(r8a66597, ACLRM, ep->pipectr);
624 	r8a66597_bclr(r8a66597, ACLRM, ep->pipectr);
625 
626 	restore_usb_toggle(r8a66597, pipenum, toggle);
627 }
628 
sudmac_alloc_channel(struct r8a66597 * r8a66597,struct r8a66597_ep * ep,struct r8a66597_request * req)629 static int sudmac_alloc_channel(struct r8a66597 *r8a66597,
630 				struct r8a66597_ep *ep,
631 				struct r8a66597_request *req)
632 {
633 	struct r8a66597_dma *dma;
634 
635 	if (!r8a66597_is_sudmac(r8a66597))
636 		return -ENODEV;
637 
638 	/* Check transfer type */
639 	if (!is_bulk_pipe(ep->pipenum))
640 		return -EIO;
641 
642 	if (r8a66597->dma.used)
643 		return -EBUSY;
644 
645 	/* set SUDMAC parameters */
646 	dma = &r8a66597->dma;
647 	dma->used = 1;
648 	if (ep->ep.desc->bEndpointAddress & USB_DIR_IN) {
649 		dma->dir = 1;
650 	} else {
651 		dma->dir = 0;
652 		change_bfre_mode(r8a66597, ep->pipenum, 1);
653 	}
654 
655 	/* set r8a66597_ep paramters */
656 	ep->use_dma = 1;
657 	ep->dma = dma;
658 	ep->fifoaddr = D0FIFO;
659 	ep->fifosel = D0FIFOSEL;
660 	ep->fifoctr = D0FIFOCTR;
661 
662 	/* dma mapping */
663 	return usb_gadget_map_request(&r8a66597->gadget, &req->req, dma->dir);
664 }
665 
sudmac_free_channel(struct r8a66597 * r8a66597,struct r8a66597_ep * ep,struct r8a66597_request * req)666 static void sudmac_free_channel(struct r8a66597 *r8a66597,
667 				struct r8a66597_ep *ep,
668 				struct r8a66597_request *req)
669 {
670 	if (!r8a66597_is_sudmac(r8a66597))
671 		return;
672 
673 	usb_gadget_unmap_request(&r8a66597->gadget, &req->req, ep->dma->dir);
674 
675 	r8a66597_bclr(r8a66597, DREQE, ep->fifosel);
676 	r8a66597_change_curpipe(r8a66597, 0, 0, ep->fifosel);
677 
678 	ep->dma->used = 0;
679 	ep->use_dma = 0;
680 	ep->fifoaddr = CFIFO;
681 	ep->fifosel = CFIFOSEL;
682 	ep->fifoctr = CFIFOCTR;
683 }
684 
sudmac_start(struct r8a66597 * r8a66597,struct r8a66597_ep * ep,struct r8a66597_request * req)685 static void sudmac_start(struct r8a66597 *r8a66597, struct r8a66597_ep *ep,
686 			 struct r8a66597_request *req)
687 {
688 	BUG_ON(req->req.length == 0);
689 
690 	r8a66597_sudmac_write(r8a66597, LBA_WAIT, CH0CFG);
691 	r8a66597_sudmac_write(r8a66597, req->req.dma, CH0BA);
692 	r8a66597_sudmac_write(r8a66597, req->req.length, CH0BBC);
693 	r8a66597_sudmac_write(r8a66597, CH0ENDE, DINTCTRL);
694 
695 	r8a66597_sudmac_write(r8a66597, DEN, CH0DEN);
696 }
697 
start_packet_write(struct r8a66597_ep * ep,struct r8a66597_request * req)698 static void start_packet_write(struct r8a66597_ep *ep,
699 				struct r8a66597_request *req)
700 {
701 	struct r8a66597 *r8a66597 = ep->r8a66597;
702 	u16 tmp;
703 
704 	pipe_change(r8a66597, ep->pipenum);
705 	disable_irq_empty(r8a66597, ep->pipenum);
706 	pipe_start(r8a66597, ep->pipenum);
707 
708 	if (req->req.length == 0) {
709 		transfer_complete(ep, req, 0);
710 	} else {
711 		r8a66597_write(r8a66597, ~(1 << ep->pipenum), BRDYSTS);
712 		if (sudmac_alloc_channel(r8a66597, ep, req) < 0) {
713 			/* PIO mode */
714 			pipe_change(r8a66597, ep->pipenum);
715 			disable_irq_empty(r8a66597, ep->pipenum);
716 			pipe_start(r8a66597, ep->pipenum);
717 			tmp = r8a66597_read(r8a66597, ep->fifoctr);
718 			if (unlikely((tmp & FRDY) == 0))
719 				pipe_irq_enable(r8a66597, ep->pipenum);
720 			else
721 				irq_packet_write(ep, req);
722 		} else {
723 			/* DMA mode */
724 			pipe_change(r8a66597, ep->pipenum);
725 			disable_irq_nrdy(r8a66597, ep->pipenum);
726 			pipe_start(r8a66597, ep->pipenum);
727 			enable_irq_nrdy(r8a66597, ep->pipenum);
728 			sudmac_start(r8a66597, ep, req);
729 		}
730 	}
731 }
732 
start_packet_read(struct r8a66597_ep * ep,struct r8a66597_request * req)733 static void start_packet_read(struct r8a66597_ep *ep,
734 				struct r8a66597_request *req)
735 {
736 	struct r8a66597 *r8a66597 = ep->r8a66597;
737 	u16 pipenum = ep->pipenum;
738 
739 	if (ep->pipenum == 0) {
740 		r8a66597_mdfy(r8a66597, 0, (ISEL | CURPIPE), CFIFOSEL);
741 		r8a66597_write(r8a66597, BCLR, ep->fifoctr);
742 		pipe_start(r8a66597, pipenum);
743 		pipe_irq_enable(r8a66597, pipenum);
744 	} else {
745 		pipe_stop(r8a66597, pipenum);
746 		if (ep->pipetre) {
747 			enable_irq_nrdy(r8a66597, pipenum);
748 			r8a66597_write(r8a66597, TRCLR, ep->pipetre);
749 			r8a66597_write(r8a66597,
750 				DIV_ROUND_UP(req->req.length, ep->ep.maxpacket),
751 				ep->pipetrn);
752 			r8a66597_bset(r8a66597, TRENB, ep->pipetre);
753 		}
754 
755 		if (sudmac_alloc_channel(r8a66597, ep, req) < 0) {
756 			/* PIO mode */
757 			change_bfre_mode(r8a66597, ep->pipenum, 0);
758 			pipe_start(r8a66597, pipenum);	/* trigger once */
759 			pipe_irq_enable(r8a66597, pipenum);
760 		} else {
761 			pipe_change(r8a66597, pipenum);
762 			sudmac_start(r8a66597, ep, req);
763 			pipe_start(r8a66597, pipenum);	/* trigger once */
764 		}
765 	}
766 }
767 
start_packet(struct r8a66597_ep * ep,struct r8a66597_request * req)768 static void start_packet(struct r8a66597_ep *ep, struct r8a66597_request *req)
769 {
770 	if (ep->ep.desc->bEndpointAddress & USB_DIR_IN)
771 		start_packet_write(ep, req);
772 	else
773 		start_packet_read(ep, req);
774 }
775 
start_ep0(struct r8a66597_ep * ep,struct r8a66597_request * req)776 static void start_ep0(struct r8a66597_ep *ep, struct r8a66597_request *req)
777 {
778 	u16 ctsq;
779 
780 	ctsq = r8a66597_read(ep->r8a66597, INTSTS0) & CTSQ;
781 
782 	switch (ctsq) {
783 	case CS_RDDS:
784 		start_ep0_write(ep, req);
785 		break;
786 	case CS_WRDS:
787 		start_packet_read(ep, req);
788 		break;
789 
790 	case CS_WRND:
791 		control_end(ep->r8a66597, 0);
792 		break;
793 	default:
794 		dev_err(r8a66597_to_dev(ep->r8a66597),
795 			"start_ep0: unexpect ctsq(%x)\n", ctsq);
796 		break;
797 	}
798 }
799 
init_controller(struct r8a66597 * r8a66597)800 static void init_controller(struct r8a66597 *r8a66597)
801 {
802 	u16 vif = r8a66597->pdata->vif ? LDRV : 0;
803 	u16 irq_sense = r8a66597->irq_sense_low ? INTL : 0;
804 	u16 endian = r8a66597->pdata->endian ? BIGEND : 0;
805 
806 	if (r8a66597->pdata->on_chip) {
807 		if (r8a66597->pdata->buswait)
808 			r8a66597_write(r8a66597, r8a66597->pdata->buswait,
809 					SYSCFG1);
810 		else
811 			r8a66597_write(r8a66597, 0x0f, SYSCFG1);
812 		r8a66597_bset(r8a66597, HSE, SYSCFG0);
813 
814 		r8a66597_bclr(r8a66597, USBE, SYSCFG0);
815 		r8a66597_bclr(r8a66597, DPRPU, SYSCFG0);
816 		r8a66597_bset(r8a66597, USBE, SYSCFG0);
817 
818 		r8a66597_bset(r8a66597, SCKE, SYSCFG0);
819 
820 		r8a66597_bset(r8a66597, irq_sense, INTENB1);
821 		r8a66597_write(r8a66597, BURST | CPU_ADR_RD_WR,
822 				DMA0CFG);
823 	} else {
824 		r8a66597_bset(r8a66597, vif | endian, PINCFG);
825 		r8a66597_bset(r8a66597, HSE, SYSCFG0);		/* High spd */
826 		r8a66597_mdfy(r8a66597, get_xtal_from_pdata(r8a66597->pdata),
827 				XTAL, SYSCFG0);
828 
829 		r8a66597_bclr(r8a66597, USBE, SYSCFG0);
830 		r8a66597_bclr(r8a66597, DPRPU, SYSCFG0);
831 		r8a66597_bset(r8a66597, USBE, SYSCFG0);
832 
833 		r8a66597_bset(r8a66597, XCKE, SYSCFG0);
834 
835 		mdelay(3);
836 
837 		r8a66597_bset(r8a66597, PLLC, SYSCFG0);
838 
839 		mdelay(1);
840 
841 		r8a66597_bset(r8a66597, SCKE, SYSCFG0);
842 
843 		r8a66597_bset(r8a66597, irq_sense, INTENB1);
844 		r8a66597_write(r8a66597, BURST | CPU_ADR_RD_WR,
845 			       DMA0CFG);
846 	}
847 }
848 
disable_controller(struct r8a66597 * r8a66597)849 static void disable_controller(struct r8a66597 *r8a66597)
850 {
851 	if (r8a66597->pdata->on_chip) {
852 		r8a66597_bset(r8a66597, SCKE, SYSCFG0);
853 		r8a66597_bclr(r8a66597, UTST, TESTMODE);
854 
855 		/* disable interrupts */
856 		r8a66597_write(r8a66597, 0, INTENB0);
857 		r8a66597_write(r8a66597, 0, INTENB1);
858 		r8a66597_write(r8a66597, 0, BRDYENB);
859 		r8a66597_write(r8a66597, 0, BEMPENB);
860 		r8a66597_write(r8a66597, 0, NRDYENB);
861 
862 		/* clear status */
863 		r8a66597_write(r8a66597, 0, BRDYSTS);
864 		r8a66597_write(r8a66597, 0, NRDYSTS);
865 		r8a66597_write(r8a66597, 0, BEMPSTS);
866 
867 		r8a66597_bclr(r8a66597, USBE, SYSCFG0);
868 		r8a66597_bclr(r8a66597, SCKE, SYSCFG0);
869 
870 	} else {
871 		r8a66597_bclr(r8a66597, UTST, TESTMODE);
872 		r8a66597_bclr(r8a66597, SCKE, SYSCFG0);
873 		udelay(1);
874 		r8a66597_bclr(r8a66597, PLLC, SYSCFG0);
875 		udelay(1);
876 		udelay(1);
877 		r8a66597_bclr(r8a66597, XCKE, SYSCFG0);
878 	}
879 }
880 
r8a66597_start_xclock(struct r8a66597 * r8a66597)881 static void r8a66597_start_xclock(struct r8a66597 *r8a66597)
882 {
883 	u16 tmp;
884 
885 	if (!r8a66597->pdata->on_chip) {
886 		tmp = r8a66597_read(r8a66597, SYSCFG0);
887 		if (!(tmp & XCKE))
888 			r8a66597_bset(r8a66597, XCKE, SYSCFG0);
889 	}
890 }
891 
get_request_from_ep(struct r8a66597_ep * ep)892 static struct r8a66597_request *get_request_from_ep(struct r8a66597_ep *ep)
893 {
894 	return list_entry(ep->queue.next, struct r8a66597_request, queue);
895 }
896 
897 /*-------------------------------------------------------------------------*/
transfer_complete(struct r8a66597_ep * ep,struct r8a66597_request * req,int status)898 static void transfer_complete(struct r8a66597_ep *ep,
899 		struct r8a66597_request *req, int status)
900 __releases(r8a66597->lock)
901 __acquires(r8a66597->lock)
902 {
903 	int restart = 0;
904 
905 	if (unlikely(ep->pipenum == 0)) {
906 		if (ep->internal_ccpl) {
907 			ep->internal_ccpl = 0;
908 			return;
909 		}
910 	}
911 
912 	list_del_init(&req->queue);
913 	if (ep->r8a66597->gadget.speed == USB_SPEED_UNKNOWN)
914 		req->req.status = -ESHUTDOWN;
915 	else
916 		req->req.status = status;
917 
918 	if (!list_empty(&ep->queue))
919 		restart = 1;
920 
921 	if (ep->use_dma)
922 		sudmac_free_channel(ep->r8a66597, ep, req);
923 
924 	spin_unlock(&ep->r8a66597->lock);
925 	usb_gadget_giveback_request(&ep->ep, &req->req);
926 	spin_lock(&ep->r8a66597->lock);
927 
928 	if (restart) {
929 		req = get_request_from_ep(ep);
930 		if (ep->ep.desc)
931 			start_packet(ep, req);
932 	}
933 }
934 
irq_ep0_write(struct r8a66597_ep * ep,struct r8a66597_request * req)935 static void irq_ep0_write(struct r8a66597_ep *ep, struct r8a66597_request *req)
936 {
937 	int i;
938 	u16 tmp;
939 	unsigned bufsize;
940 	size_t size;
941 	void *buf;
942 	u16 pipenum = ep->pipenum;
943 	struct r8a66597 *r8a66597 = ep->r8a66597;
944 
945 	pipe_change(r8a66597, pipenum);
946 	r8a66597_bset(r8a66597, ISEL, ep->fifosel);
947 
948 	i = 0;
949 	do {
950 		tmp = r8a66597_read(r8a66597, ep->fifoctr);
951 		if (i++ > 100000) {
952 			dev_err(r8a66597_to_dev(r8a66597),
953 				"pipe0 is busy. maybe cpu i/o bus "
954 				"conflict. please power off this controller.");
955 			return;
956 		}
957 		ndelay(1);
958 	} while ((tmp & FRDY) == 0);
959 
960 	/* prepare parameters */
961 	bufsize = get_buffer_size(r8a66597, pipenum);
962 	buf = req->req.buf + req->req.actual;
963 	size = min(bufsize, req->req.length - req->req.actual);
964 
965 	/* write fifo */
966 	if (req->req.buf) {
967 		if (size > 0)
968 			r8a66597_write_fifo(r8a66597, ep, buf, size);
969 		if ((size == 0) || ((size % ep->ep.maxpacket) != 0))
970 			r8a66597_bset(r8a66597, BVAL, ep->fifoctr);
971 	}
972 
973 	/* update parameters */
974 	req->req.actual += size;
975 
976 	/* check transfer finish */
977 	if ((!req->req.zero && (req->req.actual == req->req.length))
978 			|| (size % ep->ep.maxpacket)
979 			|| (size == 0)) {
980 		disable_irq_ready(r8a66597, pipenum);
981 		disable_irq_empty(r8a66597, pipenum);
982 	} else {
983 		disable_irq_ready(r8a66597, pipenum);
984 		enable_irq_empty(r8a66597, pipenum);
985 	}
986 	pipe_start(r8a66597, pipenum);
987 }
988 
irq_packet_write(struct r8a66597_ep * ep,struct r8a66597_request * req)989 static void irq_packet_write(struct r8a66597_ep *ep,
990 				struct r8a66597_request *req)
991 {
992 	u16 tmp;
993 	unsigned bufsize;
994 	size_t size;
995 	void *buf;
996 	u16 pipenum = ep->pipenum;
997 	struct r8a66597 *r8a66597 = ep->r8a66597;
998 
999 	pipe_change(r8a66597, pipenum);
1000 	tmp = r8a66597_read(r8a66597, ep->fifoctr);
1001 	if (unlikely((tmp & FRDY) == 0)) {
1002 		pipe_stop(r8a66597, pipenum);
1003 		pipe_irq_disable(r8a66597, pipenum);
1004 		dev_err(r8a66597_to_dev(r8a66597),
1005 			"write fifo not ready. pipnum=%d\n", pipenum);
1006 		return;
1007 	}
1008 
1009 	/* prepare parameters */
1010 	bufsize = get_buffer_size(r8a66597, pipenum);
1011 	buf = req->req.buf + req->req.actual;
1012 	size = min(bufsize, req->req.length - req->req.actual);
1013 
1014 	/* write fifo */
1015 	if (req->req.buf) {
1016 		r8a66597_write_fifo(r8a66597, ep, buf, size);
1017 		if ((size == 0)
1018 				|| ((size % ep->ep.maxpacket) != 0)
1019 				|| ((bufsize != ep->ep.maxpacket)
1020 					&& (bufsize > size)))
1021 			r8a66597_bset(r8a66597, BVAL, ep->fifoctr);
1022 	}
1023 
1024 	/* update parameters */
1025 	req->req.actual += size;
1026 	/* check transfer finish */
1027 	if ((!req->req.zero && (req->req.actual == req->req.length))
1028 			|| (size % ep->ep.maxpacket)
1029 			|| (size == 0)) {
1030 		disable_irq_ready(r8a66597, pipenum);
1031 		enable_irq_empty(r8a66597, pipenum);
1032 	} else {
1033 		disable_irq_empty(r8a66597, pipenum);
1034 		pipe_irq_enable(r8a66597, pipenum);
1035 	}
1036 }
1037 
irq_packet_read(struct r8a66597_ep * ep,struct r8a66597_request * req)1038 static void irq_packet_read(struct r8a66597_ep *ep,
1039 				struct r8a66597_request *req)
1040 {
1041 	u16 tmp;
1042 	int rcv_len, bufsize, req_len;
1043 	int size;
1044 	void *buf;
1045 	u16 pipenum = ep->pipenum;
1046 	struct r8a66597 *r8a66597 = ep->r8a66597;
1047 	int finish = 0;
1048 
1049 	pipe_change(r8a66597, pipenum);
1050 	tmp = r8a66597_read(r8a66597, ep->fifoctr);
1051 	if (unlikely((tmp & FRDY) == 0)) {
1052 		req->req.status = -EPIPE;
1053 		pipe_stop(r8a66597, pipenum);
1054 		pipe_irq_disable(r8a66597, pipenum);
1055 		dev_err(r8a66597_to_dev(r8a66597), "read fifo not ready");
1056 		return;
1057 	}
1058 
1059 	/* prepare parameters */
1060 	rcv_len = tmp & DTLN;
1061 	bufsize = get_buffer_size(r8a66597, pipenum);
1062 
1063 	buf = req->req.buf + req->req.actual;
1064 	req_len = req->req.length - req->req.actual;
1065 	if (rcv_len < bufsize)
1066 		size = min(rcv_len, req_len);
1067 	else
1068 		size = min(bufsize, req_len);
1069 
1070 	/* update parameters */
1071 	req->req.actual += size;
1072 
1073 	/* check transfer finish */
1074 	if ((!req->req.zero && (req->req.actual == req->req.length))
1075 			|| (size % ep->ep.maxpacket)
1076 			|| (size == 0)) {
1077 		pipe_stop(r8a66597, pipenum);
1078 		pipe_irq_disable(r8a66597, pipenum);
1079 		finish = 1;
1080 	}
1081 
1082 	/* read fifo */
1083 	if (req->req.buf) {
1084 		if (size == 0)
1085 			r8a66597_write(r8a66597, BCLR, ep->fifoctr);
1086 		else
1087 			r8a66597_read_fifo(r8a66597, ep->fifoaddr, buf, size);
1088 
1089 	}
1090 
1091 	if ((ep->pipenum != 0) && finish)
1092 		transfer_complete(ep, req, 0);
1093 }
1094 
irq_pipe_ready(struct r8a66597 * r8a66597,u16 status,u16 enb)1095 static void irq_pipe_ready(struct r8a66597 *r8a66597, u16 status, u16 enb)
1096 {
1097 	u16 check;
1098 	u16 pipenum;
1099 	struct r8a66597_ep *ep;
1100 	struct r8a66597_request *req;
1101 
1102 	if ((status & BRDY0) && (enb & BRDY0)) {
1103 		r8a66597_write(r8a66597, ~BRDY0, BRDYSTS);
1104 		r8a66597_mdfy(r8a66597, 0, CURPIPE, CFIFOSEL);
1105 
1106 		ep = &r8a66597->ep[0];
1107 		req = get_request_from_ep(ep);
1108 		irq_packet_read(ep, req);
1109 	} else {
1110 		for (pipenum = 1; pipenum < R8A66597_MAX_NUM_PIPE; pipenum++) {
1111 			check = 1 << pipenum;
1112 			if ((status & check) && (enb & check)) {
1113 				r8a66597_write(r8a66597, ~check, BRDYSTS);
1114 				ep = r8a66597->pipenum2ep[pipenum];
1115 				req = get_request_from_ep(ep);
1116 				if (ep->ep.desc->bEndpointAddress & USB_DIR_IN)
1117 					irq_packet_write(ep, req);
1118 				else
1119 					irq_packet_read(ep, req);
1120 			}
1121 		}
1122 	}
1123 }
1124 
irq_pipe_empty(struct r8a66597 * r8a66597,u16 status,u16 enb)1125 static void irq_pipe_empty(struct r8a66597 *r8a66597, u16 status, u16 enb)
1126 {
1127 	u16 tmp;
1128 	u16 check;
1129 	u16 pipenum;
1130 	struct r8a66597_ep *ep;
1131 	struct r8a66597_request *req;
1132 
1133 	if ((status & BEMP0) && (enb & BEMP0)) {
1134 		r8a66597_write(r8a66597, ~BEMP0, BEMPSTS);
1135 
1136 		ep = &r8a66597->ep[0];
1137 		req = get_request_from_ep(ep);
1138 		irq_ep0_write(ep, req);
1139 	} else {
1140 		for (pipenum = 1; pipenum < R8A66597_MAX_NUM_PIPE; pipenum++) {
1141 			check = 1 << pipenum;
1142 			if ((status & check) && (enb & check)) {
1143 				r8a66597_write(r8a66597, ~check, BEMPSTS);
1144 				tmp = control_reg_get(r8a66597, pipenum);
1145 				if ((tmp & INBUFM) == 0) {
1146 					disable_irq_empty(r8a66597, pipenum);
1147 					pipe_irq_disable(r8a66597, pipenum);
1148 					pipe_stop(r8a66597, pipenum);
1149 					ep = r8a66597->pipenum2ep[pipenum];
1150 					req = get_request_from_ep(ep);
1151 					if (!list_empty(&ep->queue))
1152 						transfer_complete(ep, req, 0);
1153 				}
1154 			}
1155 		}
1156 	}
1157 }
1158 
get_status(struct r8a66597 * r8a66597,struct usb_ctrlrequest * ctrl)1159 static void get_status(struct r8a66597 *r8a66597, struct usb_ctrlrequest *ctrl)
1160 __releases(r8a66597->lock)
1161 __acquires(r8a66597->lock)
1162 {
1163 	struct r8a66597_ep *ep;
1164 	u16 pid;
1165 	u16 status = 0;
1166 	u16 w_index = le16_to_cpu(ctrl->wIndex);
1167 
1168 	switch (ctrl->bRequestType & USB_RECIP_MASK) {
1169 	case USB_RECIP_DEVICE:
1170 		status = r8a66597->device_status;
1171 		break;
1172 	case USB_RECIP_INTERFACE:
1173 		status = 0;
1174 		break;
1175 	case USB_RECIP_ENDPOINT:
1176 		ep = r8a66597->epaddr2ep[w_index & USB_ENDPOINT_NUMBER_MASK];
1177 		pid = control_reg_get_pid(r8a66597, ep->pipenum);
1178 		if (pid == PID_STALL)
1179 			status = 1 << USB_ENDPOINT_HALT;
1180 		else
1181 			status = 0;
1182 		break;
1183 	default:
1184 		pipe_stall(r8a66597, 0);
1185 		return;		/* exit */
1186 	}
1187 
1188 	r8a66597->ep0_data = cpu_to_le16(status);
1189 	r8a66597->ep0_req->buf = &r8a66597->ep0_data;
1190 	r8a66597->ep0_req->length = 2;
1191 	/* AV: what happens if we get called again before that gets through? */
1192 	spin_unlock(&r8a66597->lock);
1193 	r8a66597_queue(r8a66597->gadget.ep0, r8a66597->ep0_req, GFP_ATOMIC);
1194 	spin_lock(&r8a66597->lock);
1195 }
1196 
clear_feature(struct r8a66597 * r8a66597,struct usb_ctrlrequest * ctrl)1197 static void clear_feature(struct r8a66597 *r8a66597,
1198 				struct usb_ctrlrequest *ctrl)
1199 {
1200 	switch (ctrl->bRequestType & USB_RECIP_MASK) {
1201 	case USB_RECIP_DEVICE:
1202 		control_end(r8a66597, 1);
1203 		break;
1204 	case USB_RECIP_INTERFACE:
1205 		control_end(r8a66597, 1);
1206 		break;
1207 	case USB_RECIP_ENDPOINT: {
1208 		struct r8a66597_ep *ep;
1209 		struct r8a66597_request *req;
1210 		u16 w_index = le16_to_cpu(ctrl->wIndex);
1211 
1212 		ep = r8a66597->epaddr2ep[w_index & USB_ENDPOINT_NUMBER_MASK];
1213 		if (!ep->wedge) {
1214 			pipe_stop(r8a66597, ep->pipenum);
1215 			control_reg_sqclr(r8a66597, ep->pipenum);
1216 			spin_unlock(&r8a66597->lock);
1217 			usb_ep_clear_halt(&ep->ep);
1218 			spin_lock(&r8a66597->lock);
1219 		}
1220 
1221 		control_end(r8a66597, 1);
1222 
1223 		req = get_request_from_ep(ep);
1224 		if (ep->busy) {
1225 			ep->busy = 0;
1226 			if (list_empty(&ep->queue))
1227 				break;
1228 			start_packet(ep, req);
1229 		} else if (!list_empty(&ep->queue))
1230 			pipe_start(r8a66597, ep->pipenum);
1231 		}
1232 		break;
1233 	default:
1234 		pipe_stall(r8a66597, 0);
1235 		break;
1236 	}
1237 }
1238 
set_feature(struct r8a66597 * r8a66597,struct usb_ctrlrequest * ctrl)1239 static void set_feature(struct r8a66597 *r8a66597, struct usb_ctrlrequest *ctrl)
1240 {
1241 	u16 tmp;
1242 	int timeout = 3000;
1243 
1244 	switch (ctrl->bRequestType & USB_RECIP_MASK) {
1245 	case USB_RECIP_DEVICE:
1246 		switch (le16_to_cpu(ctrl->wValue)) {
1247 		case USB_DEVICE_TEST_MODE:
1248 			control_end(r8a66597, 1);
1249 			/* Wait for the completion of status stage */
1250 			do {
1251 				tmp = r8a66597_read(r8a66597, INTSTS0) & CTSQ;
1252 				udelay(1);
1253 			} while (tmp != CS_IDST && timeout-- > 0);
1254 
1255 			if (tmp == CS_IDST)
1256 				r8a66597_bset(r8a66597,
1257 					      le16_to_cpu(ctrl->wIndex >> 8),
1258 					      TESTMODE);
1259 			break;
1260 		default:
1261 			pipe_stall(r8a66597, 0);
1262 			break;
1263 		}
1264 		break;
1265 	case USB_RECIP_INTERFACE:
1266 		control_end(r8a66597, 1);
1267 		break;
1268 	case USB_RECIP_ENDPOINT: {
1269 		struct r8a66597_ep *ep;
1270 		u16 w_index = le16_to_cpu(ctrl->wIndex);
1271 
1272 		ep = r8a66597->epaddr2ep[w_index & USB_ENDPOINT_NUMBER_MASK];
1273 		pipe_stall(r8a66597, ep->pipenum);
1274 
1275 		control_end(r8a66597, 1);
1276 		}
1277 		break;
1278 	default:
1279 		pipe_stall(r8a66597, 0);
1280 		break;
1281 	}
1282 }
1283 
1284 /* if return value is true, call class driver's setup() */
setup_packet(struct r8a66597 * r8a66597,struct usb_ctrlrequest * ctrl)1285 static int setup_packet(struct r8a66597 *r8a66597, struct usb_ctrlrequest *ctrl)
1286 {
1287 	u16 *p = (u16 *)ctrl;
1288 	unsigned long offset = USBREQ;
1289 	int i, ret = 0;
1290 
1291 	/* read fifo */
1292 	r8a66597_write(r8a66597, ~VALID, INTSTS0);
1293 
1294 	for (i = 0; i < 4; i++)
1295 		p[i] = r8a66597_read(r8a66597, offset + i*2);
1296 
1297 	/* check request */
1298 	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
1299 		switch (ctrl->bRequest) {
1300 		case USB_REQ_GET_STATUS:
1301 			get_status(r8a66597, ctrl);
1302 			break;
1303 		case USB_REQ_CLEAR_FEATURE:
1304 			clear_feature(r8a66597, ctrl);
1305 			break;
1306 		case USB_REQ_SET_FEATURE:
1307 			set_feature(r8a66597, ctrl);
1308 			break;
1309 		default:
1310 			ret = 1;
1311 			break;
1312 		}
1313 	} else
1314 		ret = 1;
1315 	return ret;
1316 }
1317 
r8a66597_update_usb_speed(struct r8a66597 * r8a66597)1318 static void r8a66597_update_usb_speed(struct r8a66597 *r8a66597)
1319 {
1320 	u16 speed = get_usb_speed(r8a66597);
1321 
1322 	switch (speed) {
1323 	case HSMODE:
1324 		r8a66597->gadget.speed = USB_SPEED_HIGH;
1325 		break;
1326 	case FSMODE:
1327 		r8a66597->gadget.speed = USB_SPEED_FULL;
1328 		break;
1329 	default:
1330 		r8a66597->gadget.speed = USB_SPEED_UNKNOWN;
1331 		dev_err(r8a66597_to_dev(r8a66597), "USB speed unknown\n");
1332 	}
1333 }
1334 
irq_device_state(struct r8a66597 * r8a66597)1335 static void irq_device_state(struct r8a66597 *r8a66597)
1336 {
1337 	u16 dvsq;
1338 
1339 	dvsq = r8a66597_read(r8a66597, INTSTS0) & DVSQ;
1340 	r8a66597_write(r8a66597, ~DVST, INTSTS0);
1341 
1342 	if (dvsq == DS_DFLT) {
1343 		/* bus reset */
1344 		spin_unlock(&r8a66597->lock);
1345 		usb_gadget_udc_reset(&r8a66597->gadget, r8a66597->driver);
1346 		spin_lock(&r8a66597->lock);
1347 		r8a66597_update_usb_speed(r8a66597);
1348 	}
1349 	if (r8a66597->old_dvsq == DS_CNFG && dvsq != DS_CNFG)
1350 		r8a66597_update_usb_speed(r8a66597);
1351 	if ((dvsq == DS_CNFG || dvsq == DS_ADDS)
1352 			&& r8a66597->gadget.speed == USB_SPEED_UNKNOWN)
1353 		r8a66597_update_usb_speed(r8a66597);
1354 
1355 	r8a66597->old_dvsq = dvsq;
1356 }
1357 
irq_control_stage(struct r8a66597 * r8a66597)1358 static void irq_control_stage(struct r8a66597 *r8a66597)
1359 __releases(r8a66597->lock)
1360 __acquires(r8a66597->lock)
1361 {
1362 	struct usb_ctrlrequest ctrl;
1363 	u16 ctsq;
1364 
1365 	ctsq = r8a66597_read(r8a66597, INTSTS0) & CTSQ;
1366 	r8a66597_write(r8a66597, ~CTRT, INTSTS0);
1367 
1368 	switch (ctsq) {
1369 	case CS_IDST: {
1370 		struct r8a66597_ep *ep;
1371 		struct r8a66597_request *req;
1372 		ep = &r8a66597->ep[0];
1373 		req = get_request_from_ep(ep);
1374 		transfer_complete(ep, req, 0);
1375 		}
1376 		break;
1377 
1378 	case CS_RDDS:
1379 	case CS_WRDS:
1380 	case CS_WRND:
1381 		if (setup_packet(r8a66597, &ctrl)) {
1382 			spin_unlock(&r8a66597->lock);
1383 			if (r8a66597->driver->setup(&r8a66597->gadget, &ctrl)
1384 				< 0)
1385 				pipe_stall(r8a66597, 0);
1386 			spin_lock(&r8a66597->lock);
1387 		}
1388 		break;
1389 	case CS_RDSS:
1390 	case CS_WRSS:
1391 		control_end(r8a66597, 0);
1392 		break;
1393 	default:
1394 		dev_err(r8a66597_to_dev(r8a66597),
1395 			"ctrl_stage: unexpect ctsq(%x)\n", ctsq);
1396 		break;
1397 	}
1398 }
1399 
sudmac_finish(struct r8a66597 * r8a66597,struct r8a66597_ep * ep)1400 static void sudmac_finish(struct r8a66597 *r8a66597, struct r8a66597_ep *ep)
1401 {
1402 	u16 pipenum;
1403 	struct r8a66597_request *req;
1404 	u32 len;
1405 	int i = 0;
1406 
1407 	pipenum = ep->pipenum;
1408 	pipe_change(r8a66597, pipenum);
1409 
1410 	while (!(r8a66597_read(r8a66597, ep->fifoctr) & FRDY)) {
1411 		udelay(1);
1412 		if (unlikely(i++ >= 10000)) {	/* timeout = 10 msec */
1413 			dev_err(r8a66597_to_dev(r8a66597),
1414 				"%s: FRDY was not set (%d)\n",
1415 				__func__, pipenum);
1416 			return;
1417 		}
1418 	}
1419 
1420 	r8a66597_bset(r8a66597, BCLR, ep->fifoctr);
1421 	req = get_request_from_ep(ep);
1422 
1423 	/* prepare parameters */
1424 	len = r8a66597_sudmac_read(r8a66597, CH0CBC);
1425 	req->req.actual += len;
1426 
1427 	/* clear */
1428 	r8a66597_sudmac_write(r8a66597, CH0STCLR, DSTSCLR);
1429 
1430 	/* check transfer finish */
1431 	if ((!req->req.zero && (req->req.actual == req->req.length))
1432 			|| (len % ep->ep.maxpacket)) {
1433 		if (ep->dma->dir) {
1434 			disable_irq_ready(r8a66597, pipenum);
1435 			enable_irq_empty(r8a66597, pipenum);
1436 		} else {
1437 			/* Clear the interrupt flag for next transfer */
1438 			r8a66597_write(r8a66597, ~(1 << pipenum), BRDYSTS);
1439 			transfer_complete(ep, req, 0);
1440 		}
1441 	}
1442 }
1443 
r8a66597_sudmac_irq(struct r8a66597 * r8a66597)1444 static void r8a66597_sudmac_irq(struct r8a66597 *r8a66597)
1445 {
1446 	u32 irqsts;
1447 	struct r8a66597_ep *ep;
1448 	u16 pipenum;
1449 
1450 	irqsts = r8a66597_sudmac_read(r8a66597, DINTSTS);
1451 	if (irqsts & CH0ENDS) {
1452 		r8a66597_sudmac_write(r8a66597, CH0ENDC, DINTSTSCLR);
1453 		pipenum = (r8a66597_read(r8a66597, D0FIFOSEL) & CURPIPE);
1454 		ep = r8a66597->pipenum2ep[pipenum];
1455 		sudmac_finish(r8a66597, ep);
1456 	}
1457 }
1458 
r8a66597_irq(int irq,void * _r8a66597)1459 static irqreturn_t r8a66597_irq(int irq, void *_r8a66597)
1460 {
1461 	struct r8a66597 *r8a66597 = _r8a66597;
1462 	u16 intsts0;
1463 	u16 intenb0;
1464 	u16 savepipe;
1465 	u16 mask0;
1466 
1467 	spin_lock(&r8a66597->lock);
1468 
1469 	if (r8a66597_is_sudmac(r8a66597))
1470 		r8a66597_sudmac_irq(r8a66597);
1471 
1472 	intsts0 = r8a66597_read(r8a66597, INTSTS0);
1473 	intenb0 = r8a66597_read(r8a66597, INTENB0);
1474 
1475 	savepipe = r8a66597_read(r8a66597, CFIFOSEL);
1476 
1477 	mask0 = intsts0 & intenb0;
1478 	if (mask0) {
1479 		u16 brdysts = r8a66597_read(r8a66597, BRDYSTS);
1480 		u16 bempsts = r8a66597_read(r8a66597, BEMPSTS);
1481 		u16 brdyenb = r8a66597_read(r8a66597, BRDYENB);
1482 		u16 bempenb = r8a66597_read(r8a66597, BEMPENB);
1483 
1484 		if (mask0 & VBINT) {
1485 			r8a66597_write(r8a66597,  0xffff & ~VBINT,
1486 					INTSTS0);
1487 			r8a66597_start_xclock(r8a66597);
1488 
1489 			/* start vbus sampling */
1490 			r8a66597->old_vbus = r8a66597_read(r8a66597, INTSTS0)
1491 					& VBSTS;
1492 			r8a66597->scount = R8A66597_MAX_SAMPLING;
1493 
1494 			mod_timer(&r8a66597->timer,
1495 					jiffies + msecs_to_jiffies(50));
1496 		}
1497 		if (intsts0 & DVSQ)
1498 			irq_device_state(r8a66597);
1499 
1500 		if ((intsts0 & BRDY) && (intenb0 & BRDYE)
1501 				&& (brdysts & brdyenb))
1502 			irq_pipe_ready(r8a66597, brdysts, brdyenb);
1503 		if ((intsts0 & BEMP) && (intenb0 & BEMPE)
1504 				&& (bempsts & bempenb))
1505 			irq_pipe_empty(r8a66597, bempsts, bempenb);
1506 
1507 		if (intsts0 & CTRT)
1508 			irq_control_stage(r8a66597);
1509 	}
1510 
1511 	r8a66597_write(r8a66597, savepipe, CFIFOSEL);
1512 
1513 	spin_unlock(&r8a66597->lock);
1514 	return IRQ_HANDLED;
1515 }
1516 
r8a66597_timer(struct timer_list * t)1517 static void r8a66597_timer(struct timer_list *t)
1518 {
1519 	struct r8a66597 *r8a66597 = from_timer(r8a66597, t, timer);
1520 	unsigned long flags;
1521 	u16 tmp;
1522 
1523 	spin_lock_irqsave(&r8a66597->lock, flags);
1524 	tmp = r8a66597_read(r8a66597, SYSCFG0);
1525 	if (r8a66597->scount > 0) {
1526 		tmp = r8a66597_read(r8a66597, INTSTS0) & VBSTS;
1527 		if (tmp == r8a66597->old_vbus) {
1528 			r8a66597->scount--;
1529 			if (r8a66597->scount == 0) {
1530 				if (tmp == VBSTS)
1531 					r8a66597_usb_connect(r8a66597);
1532 				else
1533 					r8a66597_usb_disconnect(r8a66597);
1534 			} else {
1535 				mod_timer(&r8a66597->timer,
1536 					jiffies + msecs_to_jiffies(50));
1537 			}
1538 		} else {
1539 			r8a66597->scount = R8A66597_MAX_SAMPLING;
1540 			r8a66597->old_vbus = tmp;
1541 			mod_timer(&r8a66597->timer,
1542 					jiffies + msecs_to_jiffies(50));
1543 		}
1544 	}
1545 	spin_unlock_irqrestore(&r8a66597->lock, flags);
1546 }
1547 
1548 /*-------------------------------------------------------------------------*/
r8a66597_enable(struct usb_ep * _ep,const struct usb_endpoint_descriptor * desc)1549 static int r8a66597_enable(struct usb_ep *_ep,
1550 			 const struct usb_endpoint_descriptor *desc)
1551 {
1552 	struct r8a66597_ep *ep;
1553 
1554 	ep = container_of(_ep, struct r8a66597_ep, ep);
1555 	return alloc_pipe_config(ep, desc);
1556 }
1557 
r8a66597_disable(struct usb_ep * _ep)1558 static int r8a66597_disable(struct usb_ep *_ep)
1559 {
1560 	struct r8a66597_ep *ep;
1561 	struct r8a66597_request *req;
1562 	unsigned long flags;
1563 
1564 	ep = container_of(_ep, struct r8a66597_ep, ep);
1565 	BUG_ON(!ep);
1566 
1567 	while (!list_empty(&ep->queue)) {
1568 		req = get_request_from_ep(ep);
1569 		spin_lock_irqsave(&ep->r8a66597->lock, flags);
1570 		transfer_complete(ep, req, -ECONNRESET);
1571 		spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
1572 	}
1573 
1574 	pipe_irq_disable(ep->r8a66597, ep->pipenum);
1575 	return free_pipe_config(ep);
1576 }
1577 
r8a66597_alloc_request(struct usb_ep * _ep,gfp_t gfp_flags)1578 static struct usb_request *r8a66597_alloc_request(struct usb_ep *_ep,
1579 						gfp_t gfp_flags)
1580 {
1581 	struct r8a66597_request *req;
1582 
1583 	req = kzalloc(sizeof(struct r8a66597_request), gfp_flags);
1584 	if (!req)
1585 		return NULL;
1586 
1587 	INIT_LIST_HEAD(&req->queue);
1588 
1589 	return &req->req;
1590 }
1591 
r8a66597_free_request(struct usb_ep * _ep,struct usb_request * _req)1592 static void r8a66597_free_request(struct usb_ep *_ep, struct usb_request *_req)
1593 {
1594 	struct r8a66597_request *req;
1595 
1596 	req = container_of(_req, struct r8a66597_request, req);
1597 	kfree(req);
1598 }
1599 
r8a66597_queue(struct usb_ep * _ep,struct usb_request * _req,gfp_t gfp_flags)1600 static int r8a66597_queue(struct usb_ep *_ep, struct usb_request *_req,
1601 			gfp_t gfp_flags)
1602 {
1603 	struct r8a66597_ep *ep;
1604 	struct r8a66597_request *req;
1605 	unsigned long flags;
1606 	int request = 0;
1607 
1608 	ep = container_of(_ep, struct r8a66597_ep, ep);
1609 	req = container_of(_req, struct r8a66597_request, req);
1610 
1611 	if (ep->r8a66597->gadget.speed == USB_SPEED_UNKNOWN)
1612 		return -ESHUTDOWN;
1613 
1614 	spin_lock_irqsave(&ep->r8a66597->lock, flags);
1615 
1616 	if (list_empty(&ep->queue))
1617 		request = 1;
1618 
1619 	list_add_tail(&req->queue, &ep->queue);
1620 	req->req.actual = 0;
1621 	req->req.status = -EINPROGRESS;
1622 
1623 	if (ep->ep.desc == NULL)	/* control */
1624 		start_ep0(ep, req);
1625 	else {
1626 		if (request && !ep->busy)
1627 			start_packet(ep, req);
1628 	}
1629 
1630 	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
1631 
1632 	return 0;
1633 }
1634 
r8a66597_dequeue(struct usb_ep * _ep,struct usb_request * _req)1635 static int r8a66597_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1636 {
1637 	struct r8a66597_ep *ep;
1638 	struct r8a66597_request *req;
1639 	unsigned long flags;
1640 
1641 	ep = container_of(_ep, struct r8a66597_ep, ep);
1642 	req = container_of(_req, struct r8a66597_request, req);
1643 
1644 	spin_lock_irqsave(&ep->r8a66597->lock, flags);
1645 	if (!list_empty(&ep->queue))
1646 		transfer_complete(ep, req, -ECONNRESET);
1647 	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
1648 
1649 	return 0;
1650 }
1651 
r8a66597_set_halt(struct usb_ep * _ep,int value)1652 static int r8a66597_set_halt(struct usb_ep *_ep, int value)
1653 {
1654 	struct r8a66597_ep *ep = container_of(_ep, struct r8a66597_ep, ep);
1655 	unsigned long flags;
1656 	int ret = 0;
1657 
1658 	spin_lock_irqsave(&ep->r8a66597->lock, flags);
1659 	if (!list_empty(&ep->queue)) {
1660 		ret = -EAGAIN;
1661 	} else if (value) {
1662 		ep->busy = 1;
1663 		pipe_stall(ep->r8a66597, ep->pipenum);
1664 	} else {
1665 		ep->busy = 0;
1666 		ep->wedge = 0;
1667 		pipe_stop(ep->r8a66597, ep->pipenum);
1668 	}
1669 	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
1670 	return ret;
1671 }
1672 
r8a66597_set_wedge(struct usb_ep * _ep)1673 static int r8a66597_set_wedge(struct usb_ep *_ep)
1674 {
1675 	struct r8a66597_ep *ep;
1676 	unsigned long flags;
1677 
1678 	ep = container_of(_ep, struct r8a66597_ep, ep);
1679 
1680 	if (!ep || !ep->ep.desc)
1681 		return -EINVAL;
1682 
1683 	spin_lock_irqsave(&ep->r8a66597->lock, flags);
1684 	ep->wedge = 1;
1685 	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
1686 
1687 	return usb_ep_set_halt(_ep);
1688 }
1689 
r8a66597_fifo_flush(struct usb_ep * _ep)1690 static void r8a66597_fifo_flush(struct usb_ep *_ep)
1691 {
1692 	struct r8a66597_ep *ep;
1693 	unsigned long flags;
1694 
1695 	ep = container_of(_ep, struct r8a66597_ep, ep);
1696 	spin_lock_irqsave(&ep->r8a66597->lock, flags);
1697 	if (list_empty(&ep->queue) && !ep->busy) {
1698 		pipe_stop(ep->r8a66597, ep->pipenum);
1699 		r8a66597_bclr(ep->r8a66597, BCLR, ep->fifoctr);
1700 		r8a66597_write(ep->r8a66597, ACLRM, ep->pipectr);
1701 		r8a66597_write(ep->r8a66597, 0, ep->pipectr);
1702 	}
1703 	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
1704 }
1705 
1706 static const struct usb_ep_ops r8a66597_ep_ops = {
1707 	.enable		= r8a66597_enable,
1708 	.disable	= r8a66597_disable,
1709 
1710 	.alloc_request	= r8a66597_alloc_request,
1711 	.free_request	= r8a66597_free_request,
1712 
1713 	.queue		= r8a66597_queue,
1714 	.dequeue	= r8a66597_dequeue,
1715 
1716 	.set_halt	= r8a66597_set_halt,
1717 	.set_wedge	= r8a66597_set_wedge,
1718 	.fifo_flush	= r8a66597_fifo_flush,
1719 };
1720 
1721 /*-------------------------------------------------------------------------*/
r8a66597_start(struct usb_gadget * gadget,struct usb_gadget_driver * driver)1722 static int r8a66597_start(struct usb_gadget *gadget,
1723 		struct usb_gadget_driver *driver)
1724 {
1725 	struct r8a66597 *r8a66597 = gadget_to_r8a66597(gadget);
1726 
1727 	if (!driver
1728 			|| driver->max_speed < USB_SPEED_HIGH
1729 			|| !driver->setup)
1730 		return -EINVAL;
1731 	if (!r8a66597)
1732 		return -ENODEV;
1733 
1734 	/* hook up the driver */
1735 	r8a66597->driver = driver;
1736 
1737 	init_controller(r8a66597);
1738 	r8a66597_bset(r8a66597, VBSE, INTENB0);
1739 	if (r8a66597_read(r8a66597, INTSTS0) & VBSTS) {
1740 		r8a66597_start_xclock(r8a66597);
1741 		/* start vbus sampling */
1742 		r8a66597->old_vbus = r8a66597_read(r8a66597,
1743 					 INTSTS0) & VBSTS;
1744 		r8a66597->scount = R8A66597_MAX_SAMPLING;
1745 		mod_timer(&r8a66597->timer, jiffies + msecs_to_jiffies(50));
1746 	}
1747 
1748 	return 0;
1749 }
1750 
r8a66597_stop(struct usb_gadget * gadget)1751 static int r8a66597_stop(struct usb_gadget *gadget)
1752 {
1753 	struct r8a66597 *r8a66597 = gadget_to_r8a66597(gadget);
1754 	unsigned long flags;
1755 
1756 	spin_lock_irqsave(&r8a66597->lock, flags);
1757 	r8a66597_bclr(r8a66597, VBSE, INTENB0);
1758 	disable_controller(r8a66597);
1759 	spin_unlock_irqrestore(&r8a66597->lock, flags);
1760 
1761 	r8a66597->driver = NULL;
1762 	return 0;
1763 }
1764 
1765 /*-------------------------------------------------------------------------*/
r8a66597_get_frame(struct usb_gadget * _gadget)1766 static int r8a66597_get_frame(struct usb_gadget *_gadget)
1767 {
1768 	struct r8a66597 *r8a66597 = gadget_to_r8a66597(_gadget);
1769 	return r8a66597_read(r8a66597, FRMNUM) & 0x03FF;
1770 }
1771 
r8a66597_pullup(struct usb_gadget * gadget,int is_on)1772 static int r8a66597_pullup(struct usb_gadget *gadget, int is_on)
1773 {
1774 	struct r8a66597 *r8a66597 = gadget_to_r8a66597(gadget);
1775 	unsigned long flags;
1776 
1777 	spin_lock_irqsave(&r8a66597->lock, flags);
1778 	if (is_on)
1779 		r8a66597_bset(r8a66597, DPRPU, SYSCFG0);
1780 	else
1781 		r8a66597_bclr(r8a66597, DPRPU, SYSCFG0);
1782 	spin_unlock_irqrestore(&r8a66597->lock, flags);
1783 
1784 	return 0;
1785 }
1786 
r8a66597_set_selfpowered(struct usb_gadget * gadget,int is_self)1787 static int r8a66597_set_selfpowered(struct usb_gadget *gadget, int is_self)
1788 {
1789 	struct r8a66597 *r8a66597 = gadget_to_r8a66597(gadget);
1790 
1791 	gadget->is_selfpowered = (is_self != 0);
1792 	if (is_self)
1793 		r8a66597->device_status |= 1 << USB_DEVICE_SELF_POWERED;
1794 	else
1795 		r8a66597->device_status &= ~(1 << USB_DEVICE_SELF_POWERED);
1796 
1797 	return 0;
1798 }
1799 
1800 static const struct usb_gadget_ops r8a66597_gadget_ops = {
1801 	.get_frame		= r8a66597_get_frame,
1802 	.udc_start		= r8a66597_start,
1803 	.udc_stop		= r8a66597_stop,
1804 	.pullup			= r8a66597_pullup,
1805 	.set_selfpowered	= r8a66597_set_selfpowered,
1806 };
1807 
r8a66597_remove(struct platform_device * pdev)1808 static void r8a66597_remove(struct platform_device *pdev)
1809 {
1810 	struct r8a66597		*r8a66597 = platform_get_drvdata(pdev);
1811 
1812 	usb_del_gadget_udc(&r8a66597->gadget);
1813 	del_timer_sync(&r8a66597->timer);
1814 	r8a66597_free_request(&r8a66597->ep[0].ep, r8a66597->ep0_req);
1815 
1816 	if (r8a66597->pdata->on_chip) {
1817 		clk_disable_unprepare(r8a66597->clk);
1818 	}
1819 }
1820 
nop_completion(struct usb_ep * ep,struct usb_request * r)1821 static void nop_completion(struct usb_ep *ep, struct usb_request *r)
1822 {
1823 }
1824 
r8a66597_sudmac_ioremap(struct r8a66597 * r8a66597,struct platform_device * pdev)1825 static int r8a66597_sudmac_ioremap(struct r8a66597 *r8a66597,
1826 					  struct platform_device *pdev)
1827 {
1828 	r8a66597->sudmac_reg =
1829 		devm_platform_ioremap_resource_byname(pdev, "sudmac");
1830 	return PTR_ERR_OR_ZERO(r8a66597->sudmac_reg);
1831 }
1832 
r8a66597_probe(struct platform_device * pdev)1833 static int r8a66597_probe(struct platform_device *pdev)
1834 {
1835 	struct device *dev = &pdev->dev;
1836 	char clk_name[8];
1837 	struct resource *ires;
1838 	int irq;
1839 	void __iomem *reg = NULL;
1840 	struct r8a66597 *r8a66597 = NULL;
1841 	int ret = 0;
1842 	int i;
1843 	unsigned long irq_trigger;
1844 
1845 	reg = devm_platform_ioremap_resource(pdev, 0);
1846 	if (IS_ERR(reg))
1847 		return PTR_ERR(reg);
1848 
1849 	ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1850 	if (!ires)
1851 		return -EINVAL;
1852 	irq = ires->start;
1853 	irq_trigger = ires->flags & IRQF_TRIGGER_MASK;
1854 
1855 	if (irq < 0) {
1856 		dev_err(dev, "platform_get_irq error.\n");
1857 		return -ENODEV;
1858 	}
1859 
1860 	/* initialize ucd */
1861 	r8a66597 = devm_kzalloc(dev, sizeof(struct r8a66597), GFP_KERNEL);
1862 	if (r8a66597 == NULL)
1863 		return -ENOMEM;
1864 
1865 	spin_lock_init(&r8a66597->lock);
1866 	platform_set_drvdata(pdev, r8a66597);
1867 	r8a66597->pdata = dev_get_platdata(dev);
1868 	r8a66597->irq_sense_low = irq_trigger == IRQF_TRIGGER_LOW;
1869 
1870 	r8a66597->gadget.ops = &r8a66597_gadget_ops;
1871 	r8a66597->gadget.max_speed = USB_SPEED_HIGH;
1872 	r8a66597->gadget.name = udc_name;
1873 
1874 	timer_setup(&r8a66597->timer, r8a66597_timer, 0);
1875 	r8a66597->reg = reg;
1876 
1877 	if (r8a66597->pdata->on_chip) {
1878 		snprintf(clk_name, sizeof(clk_name), "usb%d", pdev->id);
1879 		r8a66597->clk = devm_clk_get(dev, clk_name);
1880 		if (IS_ERR(r8a66597->clk)) {
1881 			dev_err(dev, "cannot get clock \"%s\"\n", clk_name);
1882 			return PTR_ERR(r8a66597->clk);
1883 		}
1884 		clk_prepare_enable(r8a66597->clk);
1885 	}
1886 
1887 	if (r8a66597->pdata->sudmac) {
1888 		ret = r8a66597_sudmac_ioremap(r8a66597, pdev);
1889 		if (ret < 0)
1890 			goto clean_up2;
1891 	}
1892 
1893 	disable_controller(r8a66597); /* make sure controller is disabled */
1894 
1895 	ret = devm_request_irq(dev, irq, r8a66597_irq, IRQF_SHARED,
1896 			       udc_name, r8a66597);
1897 	if (ret < 0) {
1898 		dev_err(dev, "request_irq error (%d)\n", ret);
1899 		goto clean_up2;
1900 	}
1901 
1902 	INIT_LIST_HEAD(&r8a66597->gadget.ep_list);
1903 	r8a66597->gadget.ep0 = &r8a66597->ep[0].ep;
1904 	INIT_LIST_HEAD(&r8a66597->gadget.ep0->ep_list);
1905 	for (i = 0; i < R8A66597_MAX_NUM_PIPE; i++) {
1906 		struct r8a66597_ep *ep = &r8a66597->ep[i];
1907 
1908 		if (i != 0) {
1909 			INIT_LIST_HEAD(&r8a66597->ep[i].ep.ep_list);
1910 			list_add_tail(&r8a66597->ep[i].ep.ep_list,
1911 					&r8a66597->gadget.ep_list);
1912 		}
1913 		ep->r8a66597 = r8a66597;
1914 		INIT_LIST_HEAD(&ep->queue);
1915 		ep->ep.name = r8a66597_ep_name[i];
1916 		ep->ep.ops = &r8a66597_ep_ops;
1917 		usb_ep_set_maxpacket_limit(&ep->ep, 512);
1918 
1919 		if (i == 0) {
1920 			ep->ep.caps.type_control = true;
1921 		} else {
1922 			ep->ep.caps.type_iso = true;
1923 			ep->ep.caps.type_bulk = true;
1924 			ep->ep.caps.type_int = true;
1925 		}
1926 		ep->ep.caps.dir_in = true;
1927 		ep->ep.caps.dir_out = true;
1928 	}
1929 	usb_ep_set_maxpacket_limit(&r8a66597->ep[0].ep, 64);
1930 	r8a66597->ep[0].pipenum = 0;
1931 	r8a66597->ep[0].fifoaddr = CFIFO;
1932 	r8a66597->ep[0].fifosel = CFIFOSEL;
1933 	r8a66597->ep[0].fifoctr = CFIFOCTR;
1934 	r8a66597->ep[0].pipectr = get_pipectr_addr(0);
1935 	r8a66597->pipenum2ep[0] = &r8a66597->ep[0];
1936 	r8a66597->epaddr2ep[0] = &r8a66597->ep[0];
1937 
1938 	r8a66597->ep0_req = r8a66597_alloc_request(&r8a66597->ep[0].ep,
1939 							GFP_KERNEL);
1940 	if (r8a66597->ep0_req == NULL) {
1941 		ret = -ENOMEM;
1942 		goto clean_up2;
1943 	}
1944 	r8a66597->ep0_req->complete = nop_completion;
1945 
1946 	ret = usb_add_gadget_udc(dev, &r8a66597->gadget);
1947 	if (ret)
1948 		goto err_add_udc;
1949 
1950 	dev_info(dev, "version %s\n", DRIVER_VERSION);
1951 	return 0;
1952 
1953 err_add_udc:
1954 	r8a66597_free_request(&r8a66597->ep[0].ep, r8a66597->ep0_req);
1955 clean_up2:
1956 	if (r8a66597->pdata->on_chip)
1957 		clk_disable_unprepare(r8a66597->clk);
1958 
1959 	if (r8a66597->ep0_req)
1960 		r8a66597_free_request(&r8a66597->ep[0].ep, r8a66597->ep0_req);
1961 
1962 	return ret;
1963 }
1964 
1965 /*-------------------------------------------------------------------------*/
1966 static struct platform_driver r8a66597_driver = {
1967 	.remove_new =	r8a66597_remove,
1968 	.driver		= {
1969 		.name =	udc_name,
1970 	},
1971 };
1972 
1973 module_platform_driver_probe(r8a66597_driver, r8a66597_probe);
1974 
1975 MODULE_DESCRIPTION("R8A66597 USB gadget driver");
1976 MODULE_LICENSE("GPL");
1977 MODULE_AUTHOR("Yoshihiro Shimoda");
1978 MODULE_ALIAS("platform:r8a66597_udc");
1979