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TOMOYO Linux Cross Reference
Linux/sound/soc/blackfin/bf5xx-sport.c

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  1 /*
  2  * File:         bf5xx_sport.c
  3  * Based on:
  4  * Author:       Roy Huang <roy.huang@analog.com>
  5  *
  6  * Created:      Tue Sep 21 10:52:42 CEST 2004
  7  * Description:
  8  *               Blackfin SPORT Driver
  9  *
 10  *               Copyright 2004-2007 Analog Devices Inc.
 11  *
 12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 13  *
 14  * This program is free software; you can redistribute it and/or modify
 15  * it under the terms of the GNU General Public License as published by
 16  * the Free Software Foundation; either version 2 of the License, or
 17  * (at your option) any later version.
 18  *
 19  * This program is distributed in the hope that it will be useful,
 20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 22  * GNU General Public License for more details.
 23  *
 24  * You should have received a copy of the GNU General Public License
 25  * along with this program; if not, see the file COPYING, or write
 26  * to the Free Software Foundation, Inc.,
 27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 28  */
 29 
 30 #include <linux/kernel.h>
 31 #include <linux/slab.h>
 32 #include <linux/delay.h>
 33 #include <linux/dma-mapping.h>
 34 #include <linux/gpio.h>
 35 #include <linux/bug.h>
 36 #include <linux/module.h>
 37 #include <asm/portmux.h>
 38 #include <asm/dma.h>
 39 #include <asm/blackfin.h>
 40 #include <asm/cacheflush.h>
 41 
 42 #include "bf5xx-sport.h"
 43 /* delay between frame sync pulse and first data bit in multichannel mode */
 44 #define FRAME_DELAY (1<<12)
 45 
 46 /* note: multichannel is in units of 8 channels,
 47  * tdm_count is # channels NOT / 8 ! */
 48 int sport_set_multichannel(struct sport_device *sport,
 49                 int tdm_count, u32 tx_mask, u32 rx_mask, int packed)
 50 {
 51         pr_debug("%s tdm_count=%d tx_mask:0x%08x rx_mask:0x%08x packed=%d\n",
 52                         __func__, tdm_count, tx_mask, rx_mask, packed);
 53 
 54         if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
 55                 return -EBUSY;
 56 
 57         if (tdm_count & 0x7)
 58                 return -EINVAL;
 59 
 60         if (tdm_count > 32)
 61                 return -EINVAL; /* Only support less than 32 channels now */
 62 
 63         if (tdm_count) {
 64                 sport->regs->mcmc1 = ((tdm_count>>3)-1) << 12;
 65                 sport->regs->mcmc2 = FRAME_DELAY | MCMEN | \
 66                                 (packed ? (MCDTXPE|MCDRXPE) : 0);
 67 
 68                 sport->regs->mtcs0 = tx_mask;
 69                 sport->regs->mrcs0 = rx_mask;
 70                 sport->regs->mtcs1 = 0;
 71                 sport->regs->mrcs1 = 0;
 72                 sport->regs->mtcs2 = 0;
 73                 sport->regs->mrcs2 = 0;
 74                 sport->regs->mtcs3 = 0;
 75                 sport->regs->mrcs3 = 0;
 76         } else {
 77                 sport->regs->mcmc1 = 0;
 78                 sport->regs->mcmc2 = 0;
 79 
 80                 sport->regs->mtcs0 = 0;
 81                 sport->regs->mrcs0 = 0;
 82         }
 83 
 84         sport->regs->mtcs1 = 0; sport->regs->mtcs2 = 0; sport->regs->mtcs3 = 0;
 85         sport->regs->mrcs1 = 0; sport->regs->mrcs2 = 0; sport->regs->mrcs3 = 0;
 86 
 87         SSYNC();
 88 
 89         return 0;
 90 }
 91 EXPORT_SYMBOL(sport_set_multichannel);
 92 
 93 int sport_config_rx(struct sport_device *sport, unsigned int rcr1,
 94                 unsigned int rcr2, unsigned int clkdiv, unsigned int fsdiv)
 95 {
 96         if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
 97                 return -EBUSY;
 98 
 99         sport->regs->rcr1 = rcr1;
100         sport->regs->rcr2 = rcr2;
101         sport->regs->rclkdiv = clkdiv;
102         sport->regs->rfsdiv = fsdiv;
103 
104         SSYNC();
105 
106         return 0;
107 }
108 EXPORT_SYMBOL(sport_config_rx);
109 
110 int sport_config_tx(struct sport_device *sport, unsigned int tcr1,
111                 unsigned int tcr2, unsigned int clkdiv, unsigned int fsdiv)
112 {
113         if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
114                 return -EBUSY;
115 
116         sport->regs->tcr1 = tcr1;
117         sport->regs->tcr2 = tcr2;
118         sport->regs->tclkdiv = clkdiv;
119         sport->regs->tfsdiv = fsdiv;
120 
121         SSYNC();
122 
123         return 0;
124 }
125 EXPORT_SYMBOL(sport_config_tx);
126 
127 static void setup_desc(struct dmasg *desc, void *buf, int fragcount,
128                 size_t fragsize, unsigned int cfg,
129                 unsigned int x_count, unsigned int ycount, size_t wdsize)
130 {
131 
132         int i;
133 
134         for (i = 0; i < fragcount; ++i) {
135                 desc[i].next_desc_addr  = &(desc[i + 1]);
136                 desc[i].start_addr = (unsigned long)buf + i*fragsize;
137                 desc[i].cfg = cfg;
138                 desc[i].x_count = x_count;
139                 desc[i].x_modify = wdsize;
140                 desc[i].y_count = ycount;
141                 desc[i].y_modify = wdsize;
142         }
143 
144         /* make circular */
145         desc[fragcount-1].next_desc_addr = desc;
146 
147         pr_debug("setup desc: desc0=%p, next0=%p, desc1=%p,"
148                 "next1=%p\nx_count=%x,y_count=%x,addr=0x%lx,cfs=0x%x\n",
149                 desc, desc[0].next_desc_addr,
150                 desc+1, desc[1].next_desc_addr,
151                 desc[0].x_count, desc[0].y_count,
152                 desc[0].start_addr, desc[0].cfg);
153 }
154 
155 static int sport_start(struct sport_device *sport)
156 {
157         enable_dma(sport->dma_rx_chan);
158         enable_dma(sport->dma_tx_chan);
159         sport->regs->rcr1 |= RSPEN;
160         sport->regs->tcr1 |= TSPEN;
161         SSYNC();
162 
163         return 0;
164 }
165 
166 static int sport_stop(struct sport_device *sport)
167 {
168         sport->regs->tcr1 &= ~TSPEN;
169         sport->regs->rcr1 &= ~RSPEN;
170         SSYNC();
171 
172         disable_dma(sport->dma_rx_chan);
173         disable_dma(sport->dma_tx_chan);
174         return 0;
175 }
176 
177 static inline int sport_hook_rx_dummy(struct sport_device *sport)
178 {
179         struct dmasg *desc, temp_desc;
180         unsigned long flags;
181 
182         if (WARN_ON(!sport->dummy_rx_desc) ||
183             WARN_ON(sport->curr_rx_desc == sport->dummy_rx_desc))
184                 return -EINVAL;
185 
186         /* Maybe the dummy buffer descriptor ring is damaged */
187         sport->dummy_rx_desc->next_desc_addr = sport->dummy_rx_desc + 1;
188 
189         local_irq_save(flags);
190         desc = get_dma_next_desc_ptr(sport->dma_rx_chan);
191         /* Copy the descriptor which will be damaged to backup */
192         temp_desc = *desc;
193         desc->x_count = sport->dummy_count / 2;
194         desc->y_count = 0;
195         desc->next_desc_addr = sport->dummy_rx_desc;
196         local_irq_restore(flags);
197         /* Waiting for dummy buffer descriptor is already hooked*/
198         while ((get_dma_curr_desc_ptr(sport->dma_rx_chan) -
199                         sizeof(struct dmasg)) != sport->dummy_rx_desc)
200                 continue;
201         sport->curr_rx_desc = sport->dummy_rx_desc;
202         /* Restore the damaged descriptor */
203         *desc = temp_desc;
204 
205         return 0;
206 }
207 
208 static inline int sport_rx_dma_start(struct sport_device *sport, int dummy)
209 {
210         if (dummy) {
211                 sport->dummy_rx_desc->next_desc_addr = sport->dummy_rx_desc;
212                 sport->curr_rx_desc = sport->dummy_rx_desc;
213         } else
214                 sport->curr_rx_desc = sport->dma_rx_desc;
215 
216         set_dma_next_desc_addr(sport->dma_rx_chan, sport->curr_rx_desc);
217         set_dma_x_count(sport->dma_rx_chan, 0);
218         set_dma_x_modify(sport->dma_rx_chan, 0);
219         set_dma_config(sport->dma_rx_chan, (DMAFLOW_LARGE | NDSIZE_9 | \
220                                 WDSIZE_32 | WNR));
221         set_dma_curr_addr(sport->dma_rx_chan, sport->curr_rx_desc->start_addr);
222         SSYNC();
223 
224         return 0;
225 }
226 
227 static inline int sport_tx_dma_start(struct sport_device *sport, int dummy)
228 {
229         if (dummy) {
230                 sport->dummy_tx_desc->next_desc_addr = sport->dummy_tx_desc;
231                 sport->curr_tx_desc = sport->dummy_tx_desc;
232         } else
233                 sport->curr_tx_desc = sport->dma_tx_desc;
234 
235         set_dma_next_desc_addr(sport->dma_tx_chan, sport->curr_tx_desc);
236         set_dma_x_count(sport->dma_tx_chan, 0);
237         set_dma_x_modify(sport->dma_tx_chan, 0);
238         set_dma_config(sport->dma_tx_chan,
239                         (DMAFLOW_LARGE | NDSIZE_9 | WDSIZE_32));
240         set_dma_curr_addr(sport->dma_tx_chan, sport->curr_tx_desc->start_addr);
241         SSYNC();
242 
243         return 0;
244 }
245 
246 int sport_rx_start(struct sport_device *sport)
247 {
248         unsigned long flags;
249         pr_debug("%s enter\n", __func__);
250         if (sport->rx_run)
251                 return -EBUSY;
252         if (sport->tx_run) {
253                 /* tx is running, rx is not running */
254                 if (WARN_ON(!sport->dma_rx_desc) ||
255                     WARN_ON(sport->curr_rx_desc != sport->dummy_rx_desc))
256                         return -EINVAL;
257                 local_irq_save(flags);
258                 while ((get_dma_curr_desc_ptr(sport->dma_rx_chan) -
259                         sizeof(struct dmasg)) != sport->dummy_rx_desc)
260                         continue;
261                 sport->dummy_rx_desc->next_desc_addr = sport->dma_rx_desc;
262                 local_irq_restore(flags);
263                 sport->curr_rx_desc = sport->dma_rx_desc;
264         } else {
265                 sport_tx_dma_start(sport, 1);
266                 sport_rx_dma_start(sport, 0);
267                 sport_start(sport);
268         }
269 
270         sport->rx_run = 1;
271 
272         return 0;
273 }
274 EXPORT_SYMBOL(sport_rx_start);
275 
276 int sport_rx_stop(struct sport_device *sport)
277 {
278         pr_debug("%s enter\n", __func__);
279 
280         if (!sport->rx_run)
281                 return 0;
282         if (sport->tx_run) {
283                 /* TX dma is still running, hook the dummy buffer */
284                 sport_hook_rx_dummy(sport);
285         } else {
286                 /* Both rx and tx dma will be stopped */
287                 sport_stop(sport);
288                 sport->curr_rx_desc = NULL;
289                 sport->curr_tx_desc = NULL;
290         }
291 
292         sport->rx_run = 0;
293 
294         return 0;
295 }
296 EXPORT_SYMBOL(sport_rx_stop);
297 
298 static inline int sport_hook_tx_dummy(struct sport_device *sport)
299 {
300         struct dmasg *desc, temp_desc;
301         unsigned long flags;
302 
303         if (WARN_ON(!sport->dummy_tx_desc) ||
304             WARN_ON(sport->curr_tx_desc == sport->dummy_tx_desc))
305                 return -EINVAL;
306 
307         sport->dummy_tx_desc->next_desc_addr = sport->dummy_tx_desc + 1;
308 
309         /* Shorten the time on last normal descriptor */
310         local_irq_save(flags);
311         desc = get_dma_next_desc_ptr(sport->dma_tx_chan);
312         /* Store the descriptor which will be damaged */
313         temp_desc = *desc;
314         desc->x_count = sport->dummy_count / 2;
315         desc->y_count = 0;
316         desc->next_desc_addr = sport->dummy_tx_desc;
317         local_irq_restore(flags);
318         /* Waiting for dummy buffer descriptor is already hooked*/
319         while ((get_dma_curr_desc_ptr(sport->dma_tx_chan) - \
320                         sizeof(struct dmasg)) != sport->dummy_tx_desc)
321                 continue;
322         sport->curr_tx_desc = sport->dummy_tx_desc;
323         /* Restore the damaged descriptor */
324         *desc = temp_desc;
325 
326         return 0;
327 }
328 
329 int sport_tx_start(struct sport_device *sport)
330 {
331         unsigned long flags;
332         pr_debug("%s: tx_run:%d, rx_run:%d\n", __func__,
333                         sport->tx_run, sport->rx_run);
334         if (sport->tx_run)
335                 return -EBUSY;
336         if (sport->rx_run) {
337                 if (WARN_ON(!sport->dma_tx_desc) ||
338                     WARN_ON(sport->curr_tx_desc != sport->dummy_tx_desc))
339                         return -EINVAL;
340                 /* Hook the normal buffer descriptor */
341                 local_irq_save(flags);
342                 while ((get_dma_curr_desc_ptr(sport->dma_tx_chan) -
343                         sizeof(struct dmasg)) != sport->dummy_tx_desc)
344                         continue;
345                 sport->dummy_tx_desc->next_desc_addr = sport->dma_tx_desc;
346                 local_irq_restore(flags);
347                 sport->curr_tx_desc = sport->dma_tx_desc;
348         } else {
349 
350                 sport_tx_dma_start(sport, 0);
351                 /* Let rx dma run the dummy buffer */
352                 sport_rx_dma_start(sport, 1);
353                 sport_start(sport);
354         }
355         sport->tx_run = 1;
356         return 0;
357 }
358 EXPORT_SYMBOL(sport_tx_start);
359 
360 int sport_tx_stop(struct sport_device *sport)
361 {
362         if (!sport->tx_run)
363                 return 0;
364         if (sport->rx_run) {
365                 /* RX is still running, hook the dummy buffer */
366                 sport_hook_tx_dummy(sport);
367         } else {
368                 /* Both rx and tx dma stopped */
369                 sport_stop(sport);
370                 sport->curr_rx_desc = NULL;
371                 sport->curr_tx_desc = NULL;
372         }
373 
374         sport->tx_run = 0;
375 
376         return 0;
377 }
378 EXPORT_SYMBOL(sport_tx_stop);
379 
380 static inline int compute_wdsize(size_t wdsize)
381 {
382         switch (wdsize) {
383         case 1:
384                 return WDSIZE_8;
385         case 2:
386                 return WDSIZE_16;
387         case 4:
388         default:
389                 return WDSIZE_32;
390         }
391 }
392 
393 int sport_config_rx_dma(struct sport_device *sport, void *buf,
394                 int fragcount, size_t fragsize)
395 {
396         unsigned int x_count;
397         unsigned int y_count;
398         unsigned int cfg;
399         dma_addr_t addr;
400 
401         pr_debug("%s buf:%p, frag:%d, fragsize:0x%lx\n", __func__, \
402                         buf, fragcount, fragsize);
403 
404         x_count = fragsize / sport->wdsize;
405         y_count = 0;
406 
407         /* for fragments larger than 64k words we use 2d dma,
408          * denote fragecount as two numbers' mutliply and both of them
409          * are less than 64k.*/
410         if (x_count >= 0x10000) {
411                 int i, count = x_count;
412 
413                 for (i = 16; i > 0; i--) {
414                         x_count = 1 << i;
415                         if ((count & (x_count - 1)) == 0) {
416                                 y_count = count >> i;
417                                 if (y_count < 0x10000)
418                                         break;
419                         }
420                 }
421                 if (i == 0)
422                         return -EINVAL;
423         }
424         pr_debug("%s(x_count:0x%x, y_count:0x%x)\n", __func__,
425                         x_count, y_count);
426 
427         if (sport->dma_rx_desc)
428                 dma_free_coherent(NULL, sport->rx_desc_bytes,
429                                         sport->dma_rx_desc, 0);
430 
431         /* Allocate a new descritor ring as current one. */
432         sport->dma_rx_desc = dma_alloc_coherent(NULL, \
433                         fragcount * sizeof(struct dmasg), &addr, 0);
434         sport->rx_desc_bytes = fragcount * sizeof(struct dmasg);
435 
436         if (!sport->dma_rx_desc) {
437                 pr_err("Failed to allocate memory for rx desc\n");
438                 return -ENOMEM;
439         }
440 
441         sport->rx_buf = buf;
442         sport->rx_fragsize = fragsize;
443         sport->rx_frags = fragcount;
444 
445         cfg     = 0x7000 | DI_EN | compute_wdsize(sport->wdsize) | WNR | \
446                   (DESC_ELEMENT_COUNT << 8); /* large descriptor mode */
447 
448         if (y_count != 0)
449                 cfg |= DMA2D;
450 
451         setup_desc(sport->dma_rx_desc, buf, fragcount, fragsize,
452                         cfg|DMAEN, x_count, y_count, sport->wdsize);
453 
454         return 0;
455 }
456 EXPORT_SYMBOL(sport_config_rx_dma);
457 
458 int sport_config_tx_dma(struct sport_device *sport, void *buf, \
459                 int fragcount, size_t fragsize)
460 {
461         unsigned int x_count;
462         unsigned int y_count;
463         unsigned int cfg;
464         dma_addr_t addr;
465 
466         pr_debug("%s buf:%p, fragcount:%d, fragsize:0x%lx\n",
467                         __func__, buf, fragcount, fragsize);
468 
469         x_count = fragsize/sport->wdsize;
470         y_count = 0;
471 
472         /* for fragments larger than 64k words we use 2d dma,
473          * denote fragecount as two numbers' mutliply and both of them
474          * are less than 64k.*/
475         if (x_count >= 0x10000) {
476                 int i, count = x_count;
477 
478                 for (i = 16; i > 0; i--) {
479                         x_count = 1 << i;
480                         if ((count & (x_count - 1)) == 0) {
481                                 y_count = count >> i;
482                                 if (y_count < 0x10000)
483                                         break;
484                         }
485                 }
486                 if (i == 0)
487                         return -EINVAL;
488         }
489         pr_debug("%s x_count:0x%x, y_count:0x%x\n", __func__,
490                         x_count, y_count);
491 
492 
493         if (sport->dma_tx_desc) {
494                 dma_free_coherent(NULL, sport->tx_desc_bytes, \
495                                 sport->dma_tx_desc, 0);
496         }
497 
498         sport->dma_tx_desc = dma_alloc_coherent(NULL, \
499                         fragcount * sizeof(struct dmasg), &addr, 0);
500         sport->tx_desc_bytes = fragcount * sizeof(struct dmasg);
501         if (!sport->dma_tx_desc) {
502                 pr_err("Failed to allocate memory for tx desc\n");
503                 return -ENOMEM;
504         }
505 
506         sport->tx_buf = buf;
507         sport->tx_fragsize = fragsize;
508         sport->tx_frags = fragcount;
509         cfg     = 0x7000 | DI_EN | compute_wdsize(sport->wdsize) | \
510                   (DESC_ELEMENT_COUNT << 8); /* large descriptor mode */
511 
512         if (y_count != 0)
513                 cfg |= DMA2D;
514 
515         setup_desc(sport->dma_tx_desc, buf, fragcount, fragsize,
516                         cfg|DMAEN, x_count, y_count, sport->wdsize);
517 
518         return 0;
519 }
520 EXPORT_SYMBOL(sport_config_tx_dma);
521 
522 /* setup dummy dma descriptor ring, which don't generate interrupts,
523  * the x_modify is set to 0 */
524 static int sport_config_rx_dummy(struct sport_device *sport)
525 {
526         struct dmasg *desc;
527         unsigned config;
528 
529         pr_debug("%s entered\n", __func__);
530         if (L1_DATA_A_LENGTH)
531                 desc = l1_data_sram_zalloc(2 * sizeof(*desc));
532         else {
533                 dma_addr_t addr;
534                 desc = dma_alloc_coherent(NULL, 2 * sizeof(*desc), &addr, 0);
535                 memset(desc, 0, 2 * sizeof(*desc));
536         }
537         if (desc == NULL) {
538                 pr_err("Failed to allocate memory for dummy rx desc\n");
539                 return -ENOMEM;
540         }
541         sport->dummy_rx_desc = desc;
542         desc->start_addr = (unsigned long)sport->dummy_buf;
543         config = DMAFLOW_LARGE | NDSIZE_9 | compute_wdsize(sport->wdsize)
544                  | WNR | DMAEN;
545         desc->cfg = config;
546         desc->x_count = sport->dummy_count/sport->wdsize;
547         desc->x_modify = sport->wdsize;
548         desc->y_count = 0;
549         desc->y_modify = 0;
550         memcpy(desc+1, desc, sizeof(*desc));
551         desc->next_desc_addr = desc + 1;
552         desc[1].next_desc_addr = desc;
553         return 0;
554 }
555 
556 static int sport_config_tx_dummy(struct sport_device *sport)
557 {
558         struct dmasg *desc;
559         unsigned int config;
560 
561         pr_debug("%s entered\n", __func__);
562 
563         if (L1_DATA_A_LENGTH)
564                 desc = l1_data_sram_zalloc(2 * sizeof(*desc));
565         else {
566                 dma_addr_t addr;
567                 desc = dma_alloc_coherent(NULL, 2 * sizeof(*desc), &addr, 0);
568                 memset(desc, 0, 2 * sizeof(*desc));
569         }
570         if (!desc) {
571                 pr_err("Failed to allocate memory for dummy tx desc\n");
572                 return -ENOMEM;
573         }
574         sport->dummy_tx_desc = desc;
575         desc->start_addr = (unsigned long)sport->dummy_buf + \
576                 sport->dummy_count;
577         config = DMAFLOW_LARGE | NDSIZE_9 |
578                  compute_wdsize(sport->wdsize) | DMAEN;
579         desc->cfg = config;
580         desc->x_count = sport->dummy_count/sport->wdsize;
581         desc->x_modify = sport->wdsize;
582         desc->y_count = 0;
583         desc->y_modify = 0;
584         memcpy(desc+1, desc, sizeof(*desc));
585         desc->next_desc_addr = desc + 1;
586         desc[1].next_desc_addr = desc;
587         return 0;
588 }
589 
590 unsigned long sport_curr_offset_rx(struct sport_device *sport)
591 {
592         unsigned long curr = get_dma_curr_addr(sport->dma_rx_chan);
593 
594         return (unsigned char *)curr - sport->rx_buf;
595 }
596 EXPORT_SYMBOL(sport_curr_offset_rx);
597 
598 unsigned long sport_curr_offset_tx(struct sport_device *sport)
599 {
600         unsigned long curr = get_dma_curr_addr(sport->dma_tx_chan);
601 
602         return (unsigned char *)curr - sport->tx_buf;
603 }
604 EXPORT_SYMBOL(sport_curr_offset_tx);
605 
606 void sport_incfrag(struct sport_device *sport, int *frag, int tx)
607 {
608         ++(*frag);
609         if (tx == 1 && *frag == sport->tx_frags)
610                 *frag = 0;
611 
612         if (tx == 0 && *frag == sport->rx_frags)
613                 *frag = 0;
614 }
615 EXPORT_SYMBOL(sport_incfrag);
616 
617 void sport_decfrag(struct sport_device *sport, int *frag, int tx)
618 {
619         --(*frag);
620         if (tx == 1 && *frag == 0)
621                 *frag = sport->tx_frags;
622 
623         if (tx == 0 && *frag == 0)
624                 *frag = sport->rx_frags;
625 }
626 EXPORT_SYMBOL(sport_decfrag);
627 
628 static int sport_check_status(struct sport_device *sport,
629                 unsigned int *sport_stat,
630                 unsigned int *rx_stat,
631                 unsigned int *tx_stat)
632 {
633         int status = 0;
634 
635         if (sport_stat) {
636                 SSYNC();
637                 status = sport->regs->stat;
638                 if (status & (TOVF|TUVF|ROVF|RUVF))
639                         sport->regs->stat = (status & (TOVF|TUVF|ROVF|RUVF));
640                 SSYNC();
641                 *sport_stat = status;
642         }
643 
644         if (rx_stat) {
645                 SSYNC();
646                 status = get_dma_curr_irqstat(sport->dma_rx_chan);
647                 if (status & (DMA_DONE|DMA_ERR))
648                         clear_dma_irqstat(sport->dma_rx_chan);
649                 SSYNC();
650                 *rx_stat = status;
651         }
652 
653         if (tx_stat) {
654                 SSYNC();
655                 status = get_dma_curr_irqstat(sport->dma_tx_chan);
656                 if (status & (DMA_DONE|DMA_ERR))
657                         clear_dma_irqstat(sport->dma_tx_chan);
658                 SSYNC();
659                 *tx_stat = status;
660         }
661 
662         return 0;
663 }
664 
665 int  sport_dump_stat(struct sport_device *sport, char *buf, size_t len)
666 {
667         int ret;
668 
669         ret = snprintf(buf, len,
670                         "sts: 0x%04x\n"
671                         "rx dma %d sts: 0x%04x tx dma %d sts: 0x%04x\n",
672                         sport->regs->stat,
673                         sport->dma_rx_chan,
674                         get_dma_curr_irqstat(sport->dma_rx_chan),
675                         sport->dma_tx_chan,
676                         get_dma_curr_irqstat(sport->dma_tx_chan));
677         buf += ret;
678         len -= ret;
679 
680         ret += snprintf(buf, len,
681                         "curr_rx_desc:0x%p, curr_tx_desc:0x%p\n"
682                         "dma_rx_desc:0x%p, dma_tx_desc:0x%p\n"
683                         "dummy_rx_desc:0x%p, dummy_tx_desc:0x%p\n",
684                         sport->curr_rx_desc, sport->curr_tx_desc,
685                         sport->dma_rx_desc, sport->dma_tx_desc,
686                         sport->dummy_rx_desc, sport->dummy_tx_desc);
687 
688         return ret;
689 }
690 
691 static irqreturn_t rx_handler(int irq, void *dev_id)
692 {
693         unsigned int rx_stat;
694         struct sport_device *sport = dev_id;
695 
696         pr_debug("%s enter\n", __func__);
697         sport_check_status(sport, NULL, &rx_stat, NULL);
698         if (!(rx_stat & DMA_DONE))
699                 pr_err("rx dma is already stopped\n");
700 
701         if (sport->rx_callback) {
702                 sport->rx_callback(sport->rx_data);
703                 return IRQ_HANDLED;
704         }
705 
706         return IRQ_NONE;
707 }
708 
709 static irqreturn_t tx_handler(int irq, void *dev_id)
710 {
711         unsigned int tx_stat;
712         struct sport_device *sport = dev_id;
713         pr_debug("%s enter\n", __func__);
714         sport_check_status(sport, NULL, NULL, &tx_stat);
715         if (!(tx_stat & DMA_DONE)) {
716                 pr_err("tx dma is already stopped\n");
717                 return IRQ_HANDLED;
718         }
719         if (sport->tx_callback) {
720                 sport->tx_callback(sport->tx_data);
721                 return IRQ_HANDLED;
722         }
723 
724         return IRQ_NONE;
725 }
726 
727 static irqreturn_t err_handler(int irq, void *dev_id)
728 {
729         unsigned int status = 0;
730         struct sport_device *sport = dev_id;
731 
732         pr_debug("%s\n", __func__);
733         if (sport_check_status(sport, &status, NULL, NULL)) {
734                 pr_err("error checking status ??");
735                 return IRQ_NONE;
736         }
737 
738         if (status & (TOVF|TUVF|ROVF|RUVF)) {
739                 pr_info("sport status error:%s%s%s%s\n",
740                                 status & TOVF ? " TOVF" : "",
741                                 status & TUVF ? " TUVF" : "",
742                                 status & ROVF ? " ROVF" : "",
743                                 status & RUVF ? " RUVF" : "");
744                 if (status & TOVF || status & TUVF) {
745                         disable_dma(sport->dma_tx_chan);
746                         if (sport->tx_run)
747                                 sport_tx_dma_start(sport, 0);
748                         else
749                                 sport_tx_dma_start(sport, 1);
750                         enable_dma(sport->dma_tx_chan);
751                 } else {
752                         disable_dma(sport->dma_rx_chan);
753                         if (sport->rx_run)
754                                 sport_rx_dma_start(sport, 0);
755                         else
756                                 sport_rx_dma_start(sport, 1);
757                         enable_dma(sport->dma_rx_chan);
758                 }
759         }
760         status = sport->regs->stat;
761         if (status & (TOVF|TUVF|ROVF|RUVF))
762                 sport->regs->stat = (status & (TOVF|TUVF|ROVF|RUVF));
763         SSYNC();
764 
765         if (sport->err_callback)
766                 sport->err_callback(sport->err_data);
767 
768         return IRQ_HANDLED;
769 }
770 
771 int sport_set_rx_callback(struct sport_device *sport,
772                        void (*rx_callback)(void *), void *rx_data)
773 {
774         if (WARN_ON(!rx_callback))
775                 return -EINVAL;
776         sport->rx_callback = rx_callback;
777         sport->rx_data = rx_data;
778 
779         return 0;
780 }
781 EXPORT_SYMBOL(sport_set_rx_callback);
782 
783 int sport_set_tx_callback(struct sport_device *sport,
784                 void (*tx_callback)(void *), void *tx_data)
785 {
786         if (WARN_ON(!tx_callback))
787                 return -EINVAL;
788         sport->tx_callback = tx_callback;
789         sport->tx_data = tx_data;
790 
791         return 0;
792 }
793 EXPORT_SYMBOL(sport_set_tx_callback);
794 
795 int sport_set_err_callback(struct sport_device *sport,
796                 void (*err_callback)(void *), void *err_data)
797 {
798         if (WARN_ON(!err_callback))
799                 return -EINVAL;
800         sport->err_callback = err_callback;
801         sport->err_data = err_data;
802 
803         return 0;
804 }
805 EXPORT_SYMBOL(sport_set_err_callback);
806 
807 static int sport_config_pdev(struct platform_device *pdev, struct sport_param *param)
808 {
809         /* Extract settings from platform data */
810         struct device *dev = &pdev->dev;
811         struct bfin_snd_platform_data *pdata = dev->platform_data;
812         struct resource *res;
813 
814         param->num = pdev->id;
815 
816         if (!pdata) {
817                 dev_err(dev, "no platform_data\n");
818                 return -ENODEV;
819         }
820         param->pin_req = pdata->pin_req;
821 
822         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
823         if (!res) {
824                 dev_err(dev, "no MEM resource\n");
825                 return -ENODEV;
826         }
827         param->regs = (struct sport_register *)res->start;
828 
829         /* first RX, then TX */
830         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
831         if (!res) {
832                 dev_err(dev, "no rx DMA resource\n");
833                 return -ENODEV;
834         }
835         param->dma_rx_chan = res->start;
836 
837         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
838         if (!res) {
839                 dev_err(dev, "no tx DMA resource\n");
840                 return -ENODEV;
841         }
842         param->dma_tx_chan = res->start;
843 
844         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
845         if (!res) {
846                 dev_err(dev, "no irq resource\n");
847                 return -ENODEV;
848         }
849         param->err_irq = res->start;
850 
851         return 0;
852 }
853 
854 struct sport_device *sport_init(struct platform_device *pdev,
855         unsigned int wdsize, unsigned int dummy_count, size_t priv_size)
856 {
857         struct device *dev = &pdev->dev;
858         struct sport_param param;
859         struct sport_device *sport;
860         int ret;
861 
862         dev_dbg(dev, "%s enter\n", __func__);
863 
864         param.wdsize = wdsize;
865         param.dummy_count = dummy_count;
866         if (WARN_ON(param.wdsize == 0 || param.dummy_count == 0))
867                 return NULL;
868 
869         ret = sport_config_pdev(pdev, &param);
870         if (ret)
871                 return NULL;
872 
873         if (peripheral_request_list(param.pin_req, "soc-audio")) {
874                 dev_err(dev, "requesting Peripherals failed\n");
875                 return NULL;
876         }
877 
878         sport = kzalloc(sizeof(*sport), GFP_KERNEL);
879         if (!sport) {
880                 dev_err(dev, "failed to allocate for sport device\n");
881                 goto __init_err0;
882         }
883 
884         sport->num = param.num;
885         sport->dma_rx_chan = param.dma_rx_chan;
886         sport->dma_tx_chan = param.dma_tx_chan;
887         sport->err_irq = param.err_irq;
888         sport->regs = param.regs;
889         sport->pin_req = param.pin_req;
890 
891         if (request_dma(sport->dma_rx_chan, "SPORT RX Data") == -EBUSY) {
892                 dev_err(dev, "failed to request RX dma %d\n", sport->dma_rx_chan);
893                 goto __init_err1;
894         }
895         if (set_dma_callback(sport->dma_rx_chan, rx_handler, sport) != 0) {
896                 dev_err(dev, "failed to request RX irq %d\n", sport->dma_rx_chan);
897                 goto __init_err2;
898         }
899 
900         if (request_dma(sport->dma_tx_chan, "SPORT TX Data") == -EBUSY) {
901                 dev_err(dev, "failed to request TX dma %d\n", sport->dma_tx_chan);
902                 goto __init_err2;
903         }
904 
905         if (set_dma_callback(sport->dma_tx_chan, tx_handler, sport) != 0) {
906                 dev_err(dev, "failed to request TX irq %d\n", sport->dma_tx_chan);
907                 goto __init_err3;
908         }
909 
910         if (request_irq(sport->err_irq, err_handler, IRQF_SHARED, "SPORT err",
911                         sport) < 0) {
912                 dev_err(dev, "failed to request err irq %d\n", sport->err_irq);
913                 goto __init_err3;
914         }
915 
916         dev_info(dev, "dma rx:%d tx:%d, err irq:%d, regs:%p\n",
917                         sport->dma_rx_chan, sport->dma_tx_chan,
918                         sport->err_irq, sport->regs);
919 
920         sport->wdsize = param.wdsize;
921         sport->dummy_count = param.dummy_count;
922 
923         sport->private_data = kzalloc(priv_size, GFP_KERNEL);
924         if (!sport->private_data) {
925                 dev_err(dev, "could not alloc priv data %zu bytes\n", priv_size);
926                 goto __init_err4;
927         }
928 
929         if (L1_DATA_A_LENGTH)
930                 sport->dummy_buf = l1_data_sram_zalloc(param.dummy_count * 2);
931         else
932                 sport->dummy_buf = kzalloc(param.dummy_count * 2, GFP_KERNEL);
933         if (sport->dummy_buf == NULL) {
934                 dev_err(dev, "failed to allocate dummy buffer\n");
935                 goto __error1;
936         }
937 
938         ret = sport_config_rx_dummy(sport);
939         if (ret) {
940                 dev_err(dev, "failed to config rx dummy ring\n");
941                 goto __error2;
942         }
943         ret = sport_config_tx_dummy(sport);
944         if (ret) {
945                 dev_err(dev, "failed to config tx dummy ring\n");
946                 goto __error3;
947         }
948 
949         platform_set_drvdata(pdev, sport);
950 
951         return sport;
952 __error3:
953         if (L1_DATA_A_LENGTH)
954                 l1_data_sram_free(sport->dummy_rx_desc);
955         else
956                 dma_free_coherent(NULL, 2*sizeof(struct dmasg),
957                                 sport->dummy_rx_desc, 0);
958 __error2:
959         if (L1_DATA_A_LENGTH)
960                 l1_data_sram_free(sport->dummy_buf);
961         else
962                 kfree(sport->dummy_buf);
963 __error1:
964         kfree(sport->private_data);
965 __init_err4:
966         free_irq(sport->err_irq, sport);
967 __init_err3:
968         free_dma(sport->dma_tx_chan);
969 __init_err2:
970         free_dma(sport->dma_rx_chan);
971 __init_err1:
972         kfree(sport);
973 __init_err0:
974         peripheral_free_list(param.pin_req);
975         return NULL;
976 }
977 EXPORT_SYMBOL(sport_init);
978 
979 void sport_done(struct sport_device *sport)
980 {
981         if (sport == NULL)
982                 return;
983 
984         sport_stop(sport);
985         if (sport->dma_rx_desc)
986                 dma_free_coherent(NULL, sport->rx_desc_bytes,
987                         sport->dma_rx_desc, 0);
988         if (sport->dma_tx_desc)
989                 dma_free_coherent(NULL, sport->tx_desc_bytes,
990                         sport->dma_tx_desc, 0);
991 
992 #if L1_DATA_A_LENGTH != 0
993         l1_data_sram_free(sport->dummy_rx_desc);
994         l1_data_sram_free(sport->dummy_tx_desc);
995         l1_data_sram_free(sport->dummy_buf);
996 #else
997         dma_free_coherent(NULL, 2*sizeof(struct dmasg),
998                 sport->dummy_rx_desc, 0);
999         dma_free_coherent(NULL, 2*sizeof(struct dmasg),
1000                 sport->dummy_tx_desc, 0);
1001         kfree(sport->dummy_buf);
1002 #endif
1003         free_dma(sport->dma_rx_chan);
1004         free_dma(sport->dma_tx_chan);
1005         free_irq(sport->err_irq, sport);
1006 
1007         kfree(sport->private_data);
1008         peripheral_free_list(sport->pin_req);
1009         kfree(sport);
1010 }
1011 EXPORT_SYMBOL(sport_done);
1012 
1013 /*
1014 * It is only used to send several bytes when dma is not enabled
1015  * sport controller is configured but not enabled.
1016  * Multichannel cannot works with pio mode */
1017 /* Used by ac97 to write and read codec register */
1018 int sport_send_and_recv(struct sport_device *sport, u8 *out_data, \
1019                 u8 *in_data, int len)
1020 {
1021         unsigned short dma_config;
1022         unsigned short status;
1023         unsigned long flags;
1024         unsigned long wait = 0;
1025 
1026         pr_debug("%s enter, out_data:%p, in_data:%p len:%d\n", \
1027                         __func__, out_data, in_data, len);
1028         pr_debug("tcr1:0x%04x, tcr2:0x%04x, tclkdiv:0x%04x, tfsdiv:0x%04x\n"
1029                         "mcmc1:0x%04x, mcmc2:0x%04x\n",
1030                         sport->regs->tcr1, sport->regs->tcr2,
1031                         sport->regs->tclkdiv, sport->regs->tfsdiv,
1032                         sport->regs->mcmc1, sport->regs->mcmc2);
1033         flush_dcache_range((unsigned)out_data, (unsigned)(out_data + len));
1034 
1035         /* Enable tx dma */
1036         dma_config = (RESTART | WDSIZE_16 | DI_EN);
1037         set_dma_start_addr(sport->dma_tx_chan, (unsigned long)out_data);
1038         set_dma_x_count(sport->dma_tx_chan, len/2);
1039         set_dma_x_modify(sport->dma_tx_chan, 2);
1040         set_dma_config(sport->dma_tx_chan, dma_config);
1041         enable_dma(sport->dma_tx_chan);
1042 
1043         if (in_data != NULL) {
1044                 invalidate_dcache_range((unsigned)in_data, \
1045                                 (unsigned)(in_data + len));
1046                 /* Enable rx dma */
1047                 dma_config = (RESTART | WDSIZE_16 | WNR | DI_EN);
1048                 set_dma_start_addr(sport->dma_rx_chan, (unsigned long)in_data);
1049                 set_dma_x_count(sport->dma_rx_chan, len/2);
1050                 set_dma_x_modify(sport->dma_rx_chan, 2);
1051                 set_dma_config(sport->dma_rx_chan, dma_config);
1052                 enable_dma(sport->dma_rx_chan);
1053         }
1054 
1055         local_irq_save(flags);
1056         sport->regs->tcr1 |= TSPEN;
1057         sport->regs->rcr1 |= RSPEN;
1058         SSYNC();
1059 
1060         status = get_dma_curr_irqstat(sport->dma_tx_chan);
1061         while (status & DMA_RUN) {
1062                 udelay(1);
1063                 status = get_dma_curr_irqstat(sport->dma_tx_chan);
1064                 pr_debug("DMA status:0x%04x\n", status);
1065                 if (wait++ > 100)
1066                         goto __over;
1067         }
1068         status = sport->regs->stat;
1069         wait = 0;
1070 
1071         while (!(status & TXHRE)) {
1072                 pr_debug("sport status:0x%04x\n", status);
1073                 udelay(1);
1074                 status = *(unsigned short *)&sport->regs->stat;
1075                 if (wait++ > 1000)
1076                         goto __over;
1077         }
1078         /* Wait for the last byte sent out */
1079         udelay(20);
1080         pr_debug("sport status:0x%04x\n", status);
1081 
1082 __over:
1083         sport->regs->tcr1 &= ~TSPEN;
1084         sport->regs->rcr1 &= ~RSPEN;
1085         SSYNC();
1086         disable_dma(sport->dma_tx_chan);
1087         /* Clear the status */
1088         clear_dma_irqstat(sport->dma_tx_chan);
1089         if (in_data != NULL) {
1090                 disable_dma(sport->dma_rx_chan);
1091                 clear_dma_irqstat(sport->dma_rx_chan);
1092         }
1093         SSYNC();
1094         local_irq_restore(flags);
1095 
1096         return 0;
1097 }
1098 EXPORT_SYMBOL(sport_send_and_recv);
1099 
1100 MODULE_AUTHOR("Roy Huang");
1101 MODULE_DESCRIPTION("SPORT driver for ADI Blackfin");
1102 MODULE_LICENSE("GPL");
1103 

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