sound/arm/omap-alsa-dma.c

   1 /*
   2  * sound/arm/omap-alsa-dma.c
   3  *
   4  * Common audio DMA handling for the OMAP processors
   5  *
   6  * Copyright (C) 2005 Instituto Nokia de Tecnologia - INdT - Manaus Brazil
   7  *
   8  * Copyright (C) 2004 Texas Instruments, Inc.
   9  *
  10  * Copyright (C) 2000, 2001 Nicolas Pitre <nico@cam.org>
  11  *
  12  * This package is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  18  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  19  *
  20  * History:
  21  *
  22  * 2004-06-07   Sriram Kannan   - Created new file from omap_audio_dma_intfc.c. This file
  23  *                                will contain only the DMA interface and buffer handling of OMAP
  24  *                                audio driver.
  25  *
  26  * 2004-06-22   Sriram Kannan   - removed legacy code (auto-init). Self-linking of DMA logical channel.
  27  *
  28  * 2004-08-12   Nishanth Menon  - Modified to integrate Audio requirements on 1610,1710 platforms
  29  *
  30  * 2004-11-01   Nishanth Menon  - 16xx platform code base modified to support multi channel chaining.
  31  *
  32  * 2004-12-15   Nishanth Menon  - Improved 16xx platform channel logic introduced - tasklets, queue handling updated
  33  *
  34  * 2005-07-19   INdT Kernel Team - Alsa port. Creation of new file omap-alsa-dma.c based in
  35  *                                 omap-audio-dma-intfc.c oss file. Support for aic23 codec.
  36  *                                 Removal of buffer handling (Alsa does that), modifications
  37  *      in dma handling and port to alsa structures.
  38  *
  39  * 2005-12-18   Dirk Behme      - Added L/R Channel Interchange fix as proposed by Ajaya Babu
  40  */
  41
  42 #include <linux/config.h>
  43 #include <linux/module.h>
  44 #include <linux/init.h>
  45 #include <linux/types.h>
  46 #include <linux/fs.h>
  47 #include <linux/mm.h>
  48 #include <linux/slab.h>
  49 #include <linux/sched.h>
  50 #include <linux/poll.h>
  51 #include <linux/pm.h>
  52 #include <linux/errno.h>
  53 #include <linux/sound.h>
  54 #include <linux/soundcard.h>
  55 #include <linux/sysrq.h>
  56 #include <linux/interrupt.h>
  57 #include <linux/dma-mapping.h>
  58
  59 #include <asm/uaccess.h>
  60 #include <asm/io.h>
  61 #include <asm/hardware.h>
  62 #include <asm/semaphore.h>
  63
  64 #include <asm/arch/dma.h>
  65 #include "omap-alsa-dma.h"
  66
  67 #include <asm/arch/mcbsp.h>
  68
  69 #include "omap-aic23.h"
  70
  71 #undef DEBUG
  72 //#define DEBUG
  73 #ifdef DEBUG
  74 #define DPRINTK(ARGS...)  printk(KERN_INFO "<%s>: ",__FUNCTION__);printk(ARGS)
  75 #define FN_IN printk(KERN_INFO "[%s]: start\n", __FUNCTION__)
  76 #define FN_OUT(n) printk(KERN_INFO "[%s]: end(%u)\n",__FUNCTION__, n)
  77 #else
  78
  79 #define DPRINTK( x... )
  80 #define FN_IN
  81 #define FN_OUT(x)
  82 #endif
  83
  84 #define ERR(ARGS...) printk(KERN_ERR "{%s}-ERROR: ", __FUNCTION__);printk(ARGS);
  85
  86 /* Channel Queue Handling macros
  87  * tail always points to the current free entry
  88  * Head always points to the current entry being used
  89  * end is either head or tail
  90  */
  91
  92 #define AUDIO_QUEUE_INIT(s) s->dma_q_head = s->dma_q_tail = s->dma_q_count = 0;
  93 #define AUDIO_QUEUE_FULL(s) (nr_linked_channels == s->dma_q_count)
  94 #define AUDIO_QUEUE_LAST(s) (1 == s->dma_q_count)
  95 #define AUDIO_QUEUE_EMPTY(s) (0 == s->dma_q_count)
  96 #define __AUDIO_INCREMENT_QUEUE(end) ((end)=((end)+1) % nr_linked_channels)
  97 #define AUDIO_INCREMENT_HEAD(s) __AUDIO_INCREMENT_QUEUE(s->dma_q_head); s->dma_q_count--;
  98 #define AUDIO_INCREMENT_TAIL(s) __AUDIO_INCREMENT_QUEUE(s->dma_q_tail); s->dma_q_count++;
  99
 100 /* DMA buffer fragmentation sizes */
 101 #define MAX_DMA_SIZE             0x1000000 /* todo: sync with alsa */
 102 //#define CUT_DMA_SIZE           0x1000
 103 /* TODO: To be moved to more appropriate location */
 104 #define DCSR_ERROR           0x3
 105 #define DCSR_END_BLOCK       (1 << 5)
 106 #define DCSR_SYNC_SET        (1 << 6)
 107
 108 #define DCCR_FS              (1 << 5)
 109 #define DCCR_PRIO            (1 << 6)
 110 #define DCCR_EN              (1 << 7)
 111 #define DCCR_AI              (1 << 8)
 112 #define DCCR_REPEAT          (1 << 9)
 113 /* if 0 the channel works in 3.1 compatible mode*/
 114 #define DCCR_N31COMP         (1 << 10)
 115 #define DCCR_EP              (1 << 11)
 116 #define DCCR_SRC_AMODE_BIT   12
 117 #define DCCR_SRC_AMODE_MASK  (0x3<<12)
 118 #define DCCR_DST_AMODE_BIT   14
 119 #define DCCR_DST_AMODE_MASK  (0x3<<14)
 120 #define AMODE_CONST          0x0
 121 #define AMODE_POST_INC       0x1
 122 #define AMODE_SINGLE_INDEX   0x2
 123 #define AMODE_DOUBLE_INDEX   0x3
 124
 125 /**************************** DATA STRUCTURES *****************************************/
 126
 127 static spinlock_t dma_list_lock = SPIN_LOCK_UNLOCKED;
 128
 129 static char nr_linked_channels = 1;
 130
 131 /*********************************** MODULE SPECIFIC FUNCTIONS ***********************/
 132
 133 static void sound_dma_irq_handler(int lch, u16 ch_status, void *data);
 134 static int audio_set_dma_params_play(int channel, dma_addr_t dma_ptr,
 135                                      u_int dma_size);
 136 static int audio_set_dma_params_capture(int channel, dma_addr_t dma_ptr,
 137                                         u_int dma_size);
 138 static int audio_start_dma_chain(struct audio_stream * s);
 139
 140 /***************************************************************************************
 141  *
 142  * DMA channel requests
 143  *
 144  **************************************************************************************/
 145 static void omap_sound_dma_link_lch(void *data)
 146 {
 147
 148         struct audio_stream *s = (struct audio_stream *) data;
 149         int *chan = s->lch;
 150         int i;
 151
 152         FN_IN;
 153         if (s->linked) {
 154                 FN_OUT(1);
 155                 return;
 156         }
 157         for (i = 0; i < nr_linked_channels; i++) {
 158                 int cur_chan = chan[i];
 159                 int nex_chan =
 160                     ((nr_linked_channels - 1 ==
 161                       i) ? chan[0] : chan[i + 1]);
 162                 omap_dma_link_lch(cur_chan, nex_chan);
 163         }
 164         s->linked = 1;
 165         FN_OUT(0);
 166 }
 167
 168 int omap_request_sound_dma(int device_id, const char *device_name,
 169                            void *data, int **channels)
 170 {
 171         int i, err = 0;
 172         int *chan = NULL;
 173         FN_IN;
 174         if (unlikely((NULL == channels) || (NULL == device_name))) {
 175                 BUG();
 176                 return -EPERM;
 177         }
 178         /* Try allocate memory for the num channels */
 179         *channels =
 180             (int *) kmalloc(sizeof(int) * nr_linked_channels, GFP_KERNEL);
 181         chan = *channels;
 182         if (NULL == chan) {
 183                 ERR("No Memory for channel allocs!\n");
 184                 FN_OUT(-ENOMEM);
 185                 return -ENOMEM;
 186         }
 187         spin_lock(&dma_list_lock);
 188         for (i = 0; i < nr_linked_channels; i++) {
 189                 err =
 190                     omap_request_dma(device_id, device_name,
 191                                      sound_dma_irq_handler, data,
 192                                      &chan[i]);
 193
 194                 /* Handle Failure condition here */
 195                 if (err < 0) {
 196                         int j;
 197                         for (j = 0; j < i; j++) {
 198                                 omap_free_dma(chan[j]);
 199                         }
 200                         spin_unlock(&dma_list_lock);
 201                         kfree(chan);
 202                         *channels = NULL;
 203                         ERR("Error in requesting channel %d=0x%x\n", i,
 204                             err);
 205                         FN_OUT(err);
 206                         return err;
 207                 }
 208         }
 209
 210         /* Chain the channels together */
 211         if (!cpu_is_omap1510())
 212                 omap_sound_dma_link_lch(data);
 213
 214         spin_unlock(&dma_list_lock);
 215         FN_OUT(0);
 216         return 0;
 217 }
 218
 219 /***************************************************************************************
 220  *
 221  * DMA channel requests Freeing
 222  *
 223  **************************************************************************************/
 224 static void omap_sound_dma_unlink_lch(void *data)
 225 {
 226         struct audio_stream *s = (struct audio_stream *) data;
 227         int *chan = s->lch;
 228         int i;
 229
 230         FN_IN;
 231         if (!s->linked) {
 232                 FN_OUT(1);
 233                 return;
 234         }
 235         for (i = 0; i < nr_linked_channels; i++) {
 236                 int cur_chan = chan[i];
 237                 int nex_chan =
 238                     ((nr_linked_channels - 1 ==
 239                       i) ? chan[0] : chan[i + 1]);
 240                 omap_dma_unlink_lch(cur_chan, nex_chan);
 241         }
 242         s->linked = 0;
 243         FN_OUT(0);
 244 }
 245
 246 int omap_free_sound_dma(void *data, int **channels)
 247 {
 248
 249         int i;
 250         int *chan = NULL;
 251         FN_IN;
 252         if (unlikely(NULL == channels)) {
 253                 BUG();
 254                 return -EPERM;
 255         }
 256         if (unlikely(NULL == *channels)) {
 257                 BUG();
 258                 return -EPERM;
 259         }
 260         chan = (*channels);
 261
 262         if (!cpu_is_omap1510())
 263                 omap_sound_dma_unlink_lch(data);
 264         for (i = 0; i < nr_linked_channels; i++) {
 265                 int cur_chan = chan[i];
 266                 omap_stop_dma(cur_chan);
 267                 omap_free_dma(cur_chan);
 268         }
 269         kfree(*channels);
 270         *channels = NULL;
 271         FN_OUT(0);
 272         return 0;
 273 }
 274
 275 /***************************************************************************************
 276  *
 277  * Stop all the DMA channels of the stream
 278  *
 279  **************************************************************************************/
 280 void omap_audio_stop_dma(struct audio_stream *s)
 281 {
 282         int *chan = s->lch;
 283         int i;
 284         FN_IN;
 285         if (unlikely(NULL == chan)) {
 286                 BUG();
 287                 return;
 288         }
 289         for (i = 0; i < nr_linked_channels; i++) {
 290                 int cur_chan = chan[i];
 291                 omap_stop_dma(cur_chan);
 292         }
 293         s->started = 0;
 294         FN_OUT(0);
 295         return;
 296 }
 297 /***************************************************************************************
 298  *
 299  * Clear any pending transfers
 300  *
 301  **************************************************************************************/
 302 void omap_clear_sound_dma(struct audio_stream * s)
 303 {
 304         FN_IN;
 305         omap_clear_dma(s->lch[s->dma_q_head]);
 306         FN_OUT(0);
 307         return;
 308 }
 309
 310 /*********************************** MODULE FUNCTIONS DEFINTIONS ***********************/
 311
 312 #ifdef OMAP1610_MCBSP1_BASE
 313 #undef OMAP1610_MCBSP1_BASE
 314 #endif
 315 #define OMAP1610_MCBSP1_BASE    0xE1011000
 316
 317 /***************************************************************************************
 318  *
 319  * DMA related functions
 320  *
 321  **************************************************************************************/
 322 static int audio_set_dma_params_play(int channel, dma_addr_t dma_ptr,
 323                                      u_int dma_size)
 324 {
 325         int dt = 0x1;           /* data type 16 */
 326         int cen = 32;           /* Stereo */
 327         int cfn = dma_size / (2 * cen);
 328         FN_IN;
 329         omap_set_dma_dest_params(channel, 0x05, 0x00,
 330                                  (OMAP1610_MCBSP1_BASE + 0x806),
 331                                  0, 0);
 332         omap_set_dma_src_params(channel, 0x00, 0x01, dma_ptr,
 333                                 0, 0);
 334         omap_set_dma_transfer_params(channel, dt, cen, cfn, 0x00, 0, 0);
 335         FN_OUT(0);
 336         return 0;
 337 }
 338
 339 static int audio_set_dma_params_capture(int channel, dma_addr_t dma_ptr,
 340                                         u_int dma_size)
 341 {
 342         int dt = 0x1;           /* data type 16 */
 343         int cen = 32;           /* stereo */
 344
 345         int cfn = dma_size / (2 * cen);
 346         FN_IN;
 347         omap_set_dma_src_params(channel, 0x05, 0x00,
 348                                 (OMAP1610_MCBSP1_BASE + 0x802),
 349                                 0, 0);
 350         omap_set_dma_dest_params(channel, 0x00, 0x01, dma_ptr, 0, 0);
 351         omap_set_dma_transfer_params(channel, dt, cen, cfn, 0x00, 0, 0);
 352         FN_OUT(0);
 353         return 0;
 354 }
 355
 356 static int audio_start_dma_chain(struct audio_stream *s)
 357 {
 358         int channel = s->lch[s->dma_q_head];
 359         FN_IN;
 360         if (!s->started) {
 361          s->hw_stop();      /* stops McBSP Interface */
 362                 omap_start_dma(channel);
 363                 s->started = 1;
 364                 s->hw_start();     /* start McBSP interface */
 365         }
 366         /* else the dma itself will progress forward with out our help */
 367         FN_OUT(0);
 368         return 0;
 369 }
 370
 371 /* Start DMA -
 372  * Do the initial set of work to initialize all the channels as required.
 373  * We shall then initate a transfer
 374  */
 375 int omap_start_sound_dma(struct audio_stream *s, dma_addr_t dma_ptr,
 376                          u_int dma_size)
 377 {
 378         int ret = -EPERM;
 379
 380         FN_IN;
 381
 382         if (unlikely(dma_size > MAX_DMA_SIZE)) {
 383                 ERR("DmaSoundDma: Start: overflowed %d-%d\n", dma_size,
 384                     MAX_DMA_SIZE);
 385                 return -EOVERFLOW;
 386         }
 387         //if (AUDIO_QUEUE_FULL(s)) {
 388         //      ret = -2;
 389         //      goto sound_out;
 390         //}
 391
 392         if (s->stream_id == SNDRV_PCM_STREAM_PLAYBACK) {
 393                 /*playback */
 394                 ret =
 395                     audio_set_dma_params_play(s->lch[s->dma_q_tail],
 396                                               dma_ptr, dma_size);
 397         } else {
 398                 ret =
 399                     audio_set_dma_params_capture(s->lch[s->dma_q_tail],
 400                                                  dma_ptr, dma_size);
 401         }
 402         if (ret != 0) {
 403                 ret = -3;       /* indicate queue full */
 404                 goto sound_out;
 405         }
 406         AUDIO_INCREMENT_TAIL(s);
 407         ret = audio_start_dma_chain(s);
 408         if (ret) {
 409                 ERR("dma start failed");
 410         }
 411       sound_out:
 412         FN_OUT(ret);
 413         return ret;
 414
 415 }
 416
 417 /*
 418  * ISRs have to be short and smart..
 419  * Here we call alsa handling, after some error checking
 420  */
 421 static void sound_dma_irq_handler(int sound_curr_lch, u16 ch_status,
 422                                   void *data)
 423 {
 424         int dma_status = ch_status;
 425         struct audio_stream *s = (struct audio_stream *) data;
 426         FN_IN;
 427
 428         /*
 429          * some register checkings
 430          */
 431         DPRINTK("lch=%d,status=0x%x, dma_status=%d, data=%p\n",
 432                 sound_curr_lch, ch_status, dma_status, data);
 433
 434         if (dma_status & (DCSR_ERROR)) {
 435                 OMAP_DMA_CCR_REG(sound_curr_lch) &= ~DCCR_EN;
 436                 ERR("DCSR_ERROR!\n");
 437                 FN_OUT(-1);
 438                 return;
 439         }
 440
 441         if (ch_status & DCSR_END_BLOCK)
 442                 audio_dma_callback(s);
 443         FN_OUT(0);
 444         return;
 445 }
 446
 447 MODULE_AUTHOR("Texas Instruments");
 448 MODULE_DESCRIPTION
 449     ("Common DMA handling for Audio driver on OMAP processors");
 450 MODULE_LICENSE("GPL");
 451
 452 EXPORT_SYMBOL(omap_start_sound_dma);
 453 EXPORT_SYMBOL(omap_clear_sound_dma);
 454 EXPORT_SYMBOL(omap_request_sound_dma);
 455 EXPORT_SYMBOL(omap_free_sound_dma);
 456 EXPORT_SYMBOL(omap_audio_stop_dma);