sound/soc/au1x/dbdma2.c

   1 /*
   2  * Au12x0/Au1550 PSC ALSA ASoC audio support.
   3  *
   4  * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
   5  *      Manuel Lauss <mano@roarinelk.homelinux.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * DMA glue for Au1x-PSC audio.
  12  *
  13  * NOTE: all of these drivers can only work with a SINGLE instance
  14  *       of a PSC. Multiple independent audio devices are impossible
  15  *       with ASoC v1.
  16  */
  17
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23 #include <linux/dma-mapping.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28 #include <sound/soc.h>
  29
  30 #include <asm/mach-au1x00/au1000.h>
  31 #include <asm/mach-au1x00/au1xxx_dbdma.h>
  32 #include <asm/mach-au1x00/au1xxx_psc.h>
  33
  34 #include "psc.h"
  35
  36 /*#define PCM_DEBUG*/
  37
  38 #define MSG(x...)       printk(KERN_INFO "au1xpsc_pcm: " x)
  39 #ifdef PCM_DEBUG
  40 #define DBG             MSG
  41 #else
  42 #define DBG(x...)       do {} while (0)
  43 #endif
  44
  45 struct au1xpsc_audio_dmadata {
  46         /* DDMA control data */
  47         unsigned int ddma_id;           /* DDMA direction ID for this PSC */
  48         u32 ddma_chan;                  /* DDMA context */
  49
  50         /* PCM context (for irq handlers) */
  51         struct snd_pcm_substream *substream;
  52         unsigned long curr_period;      /* current segment DDMA is working on */
  53         unsigned long q_period;         /* queue period(s) */
  54         unsigned long dma_area;         /* address of queued DMA area */
  55         unsigned long dma_area_s;       /* start address of DMA area */
  56         unsigned long pos;              /* current byte position being played */
  57         unsigned long periods;          /* number of SG segments in total */
  58         unsigned long period_bytes;     /* size in bytes of one SG segment */
  59
  60         /* runtime data */
  61         int msbits;
  62 };
  63
  64 /* instance data. There can be only one, MacLeod!!!! */
  65 static struct au1xpsc_audio_dmadata *au1xpsc_audio_pcmdma[2];
  66
  67 /*
  68  * These settings are somewhat okay, at least on my machine audio plays
  69  * almost skip-free. Especially the 64kB buffer seems to help a LOT.
  70  */
  71 #define AU1XPSC_PERIOD_MIN_BYTES        1024
  72 #define AU1XPSC_BUFFER_MIN_BYTES        65536
  73
  74 #define AU1XPSC_PCM_FMTS                                        \
  75         (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_U8 |        \
  76          SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |    \
  77          SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |    \
  78          SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |    \
  79          SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE |    \
  80          0)
  81
  82 /* PCM hardware DMA capabilities - platform specific */
  83 static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
  84         .info             = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  85                             SNDRV_PCM_INFO_INTERLEAVED,
  86         .formats          = AU1XPSC_PCM_FMTS,
  87         .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
  88         .period_bytes_max = 4096 * 1024 - 1,
  89         .periods_min      = 2,
  90         .periods_max      = 4096,       /* 2 to as-much-as-you-like */
  91         .buffer_bytes_max = 4096 * 1024 - 1,
  92         .fifo_size        = 16,         /* fifo entries of AC97/I2S PSC */
  93 };
  94
  95 static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
  96 {
  97         au1xxx_dbdma_put_source_flags(cd->ddma_chan,
  98                                 (void *)phys_to_virt(cd->dma_area),
  99                                 cd->period_bytes, DDMA_FLAGS_IE);
 100
 101         /* update next-to-queue period */
 102         ++cd->q_period;
 103         cd->dma_area += cd->period_bytes;
 104         if (cd->q_period >= cd->periods) {
 105                 cd->q_period = 0;
 106                 cd->dma_area = cd->dma_area_s;
 107         }
 108 }
 109
 110 static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
 111 {
 112         au1xxx_dbdma_put_dest_flags(cd->ddma_chan,
 113                                 (void *)phys_to_virt(cd->dma_area),
 114                                 cd->period_bytes, DDMA_FLAGS_IE);
 115
 116         /* update next-to-queue period */
 117         ++cd->q_period;
 118         cd->dma_area += cd->period_bytes;
 119         if (cd->q_period >= cd->periods) {
 120                 cd->q_period = 0;
 121                 cd->dma_area = cd->dma_area_s;
 122         }
 123 }
 124
 125 static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
 126 {
 127         struct au1xpsc_audio_dmadata *cd = dev_id;
 128
 129         cd->pos += cd->period_bytes;
 130         if (++cd->curr_period >= cd->periods) {
 131                 cd->pos = 0;
 132                 cd->curr_period = 0;
 133         }
 134         snd_pcm_period_elapsed(cd->substream);
 135         au1x_pcm_queue_tx(cd);
 136 }
 137
 138 static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
 139 {
 140         struct au1xpsc_audio_dmadata *cd = dev_id;
 141
 142         cd->pos += cd->period_bytes;
 143         if (++cd->curr_period >= cd->periods) {
 144                 cd->pos = 0;
 145                 cd->curr_period = 0;
 146         }
 147         snd_pcm_period_elapsed(cd->substream);
 148         au1x_pcm_queue_rx(cd);
 149 }
 150
 151 static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
 152 {
 153         if (pcd->ddma_chan) {
 154                 au1xxx_dbdma_stop(pcd->ddma_chan);
 155                 au1xxx_dbdma_reset(pcd->ddma_chan);
 156                 au1xxx_dbdma_chan_free(pcd->ddma_chan);
 157                 pcd->ddma_chan = 0;
 158                 pcd->msbits = 0;
 159         }
 160 }
 161
 162 /* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
 163  * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
 164  * to ALSA-supplied sample depth.  This is due to limitations in the dbdma api
 165  * (cannot adjust source/dest widths of already allocated descriptor ring).
 166  */
 167 static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
 168                                  int stype, int msbits)
 169 {
 170         /* DMA only in 8/16/32 bit widths */
 171         if (msbits == 24)
 172                 msbits = 32;
 173
 174         /* check current config: correct bits and descriptors allocated? */
 175         if ((pcd->ddma_chan) && (msbits == pcd->msbits))
 176                 goto out;       /* all ok! */
 177
 178         au1x_pcm_dbdma_free(pcd);
 179
 180         if (stype == PCM_RX)
 181                 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
 182                                         DSCR_CMD0_ALWAYS,
 183                                         au1x_pcm_dmarx_cb, (void *)pcd);
 184         else
 185                 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
 186                                         pcd->ddma_id,
 187                                         au1x_pcm_dmatx_cb, (void *)pcd);
 188
 189         if (!pcd->ddma_chan)
 190                 return -ENOMEM;;
 191
 192         au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
 193         au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
 194
 195         pcd->msbits = msbits;
 196
 197         au1xxx_dbdma_stop(pcd->ddma_chan);
 198         au1xxx_dbdma_reset(pcd->ddma_chan);
 199
 200 out:
 201         return 0;
 202 }
 203
 204 static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
 205                                  struct snd_pcm_hw_params *params)
 206 {
 207         struct snd_pcm_runtime *runtime = substream->runtime;
 208         struct au1xpsc_audio_dmadata *pcd;
 209         int stype, ret;
 210
 211         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
 212         if (ret < 0)
 213                 goto out;
 214
 215         stype = SUBSTREAM_TYPE(substream);
 216         pcd = au1xpsc_audio_pcmdma[stype];
 217
 218         DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d "
 219             "runtime->min_align %d\n",
 220                 (unsigned long)runtime->dma_area,
 221                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
 222                 runtime->min_align);
 223
 224         DBG("bits %d  frags %d  frag_bytes %d  is_rx %d\n", params->msbits,
 225                 params_periods(params), params_period_bytes(params), stype);
 226
 227         ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
 228         if (ret) {
 229                 MSG("DDMA channel (re)alloc failed!\n");
 230                 goto out;
 231         }
 232
 233         pcd->substream = substream;
 234         pcd->period_bytes = params_period_bytes(params);
 235         pcd->periods = params_periods(params);
 236         pcd->dma_area_s = pcd->dma_area = (unsigned long)runtime->dma_addr;
 237         pcd->q_period = 0;
 238         pcd->curr_period = 0;
 239         pcd->pos = 0;
 240
 241         ret = 0;
 242 out:
 243         return ret;
 244 }
 245
 246 static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
 247 {
 248         snd_pcm_lib_free_pages(substream);
 249         return 0;
 250 }
 251
 252 static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
 253 {
 254         struct au1xpsc_audio_dmadata *pcd =
 255                         au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)];
 256
 257         au1xxx_dbdma_reset(pcd->ddma_chan);
 258
 259         if (SUBSTREAM_TYPE(substream) == PCM_RX) {
 260                 au1x_pcm_queue_rx(pcd);
 261                 au1x_pcm_queue_rx(pcd);
 262         } else {
 263                 au1x_pcm_queue_tx(pcd);
 264                 au1x_pcm_queue_tx(pcd);
 265         }
 266
 267         return 0;
 268 }
 269
 270 static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 271 {
 272         u32 c = au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->ddma_chan;
 273
 274         switch (cmd) {
 275         case SNDRV_PCM_TRIGGER_START:
 276         case SNDRV_PCM_TRIGGER_RESUME:
 277                 au1xxx_dbdma_start(c);
 278                 break;
 279         case SNDRV_PCM_TRIGGER_STOP:
 280         case SNDRV_PCM_TRIGGER_SUSPEND:
 281                 au1xxx_dbdma_stop(c);
 282                 break;
 283         default:
 284                 return -EINVAL;
 285         }
 286         return 0;
 287 }
 288
 289 static snd_pcm_uframes_t
 290 au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
 291 {
 292         return bytes_to_frames(substream->runtime,
 293                 au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->pos);
 294 }
 295
 296 static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
 297 {
 298         snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
 299         return 0;
 300 }
 301
 302 static int au1xpsc_pcm_close(struct snd_pcm_substream *substream)
 303 {
 304         au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]);
 305         return 0;
 306 }
 307
 308 struct snd_pcm_ops au1xpsc_pcm_ops = {
 309         .open           = au1xpsc_pcm_open,
 310         .close          = au1xpsc_pcm_close,
 311         .ioctl          = snd_pcm_lib_ioctl,
 312         .hw_params      = au1xpsc_pcm_hw_params,
 313         .hw_free        = au1xpsc_pcm_hw_free,
 314         .prepare        = au1xpsc_pcm_prepare,
 315         .trigger        = au1xpsc_pcm_trigger,
 316         .pointer        = au1xpsc_pcm_pointer,
 317 };
 318
 319 static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm)
 320 {
 321         snd_pcm_lib_preallocate_free_for_all(pcm);
 322 }
 323
 324 static int au1xpsc_pcm_new(struct snd_card *card,
 325                            struct snd_soc_dai *dai,
 326                            struct snd_pcm *pcm)
 327 {
 328         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 329                 card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);
 330
 331         return 0;
 332 }
 333
 334 static int au1xpsc_pcm_probe(struct platform_device *pdev)
 335 {
 336         struct resource *r;
 337         int ret;
 338
 339         if (au1xpsc_audio_pcmdma[PCM_TX] || au1xpsc_audio_pcmdma[PCM_RX])
 340                 return -EBUSY;
 341
 342         /* TX DMA */
 343         au1xpsc_audio_pcmdma[PCM_TX]
 344                 = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
 345         if (!au1xpsc_audio_pcmdma[PCM_TX])
 346                 return -ENOMEM;
 347
 348         r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 349         if (!r) {
 350                 ret = -ENODEV;
 351                 goto out1;
 352         }
 353         (au1xpsc_audio_pcmdma[PCM_TX])->ddma_id = r->start;
 354
 355         /* RX DMA */
 356         au1xpsc_audio_pcmdma[PCM_RX]
 357                 = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
 358         if (!au1xpsc_audio_pcmdma[PCM_RX])
 359                 return -ENOMEM;
 360
 361         r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 362         if (!r) {
 363                 ret = -ENODEV;
 364                 goto out2;
 365         }
 366         (au1xpsc_audio_pcmdma[PCM_RX])->ddma_id = r->start;
 367
 368         return 0;
 369
 370 out2:
 371         kfree(au1xpsc_audio_pcmdma[PCM_RX]);
 372         au1xpsc_audio_pcmdma[PCM_RX] = NULL;
 373 out1:
 374         kfree(au1xpsc_audio_pcmdma[PCM_TX]);
 375         au1xpsc_audio_pcmdma[PCM_TX] = NULL;
 376         return ret;
 377 }
 378
 379 static int au1xpsc_pcm_remove(struct platform_device *pdev)
 380 {
 381         int i;
 382
 383         for (i = 0; i < 2; i++) {
 384                 if (au1xpsc_audio_pcmdma[i]) {
 385                         au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[i]);
 386                         kfree(au1xpsc_audio_pcmdma[i]);
 387                         au1xpsc_audio_pcmdma[i] = NULL;
 388                 }
 389         }
 390
 391         return 0;
 392 }
 393
 394 /* au1xpsc audio platform */
 395 struct snd_soc_platform au1xpsc_soc_platform = {
 396         .name           = "au1xpsc-pcm-dbdma",
 397         .probe          = au1xpsc_pcm_probe,
 398         .remove         = au1xpsc_pcm_remove,
 399         .pcm_ops        = &au1xpsc_pcm_ops,
 400         .pcm_new        = au1xpsc_pcm_new,
 401         .pcm_free       = au1xpsc_pcm_free_dma_buffers,
 402 };
 403 EXPORT_SYMBOL_GPL(au1xpsc_soc_platform);
 404
 405 static int __init au1xpsc_audio_dbdma_init(void)
 406 {
 407         au1xpsc_audio_pcmdma[PCM_TX] = NULL;
 408         au1xpsc_audio_pcmdma[PCM_RX] = NULL;
 409         return 0;
 410 }
 411
 412 static void __exit au1xpsc_audio_dbdma_exit(void)
 413 {
 414 }
 415
 416 module_init(au1xpsc_audio_dbdma_init);
 417 module_exit(au1xpsc_audio_dbdma_exit);
 418
 419 MODULE_LICENSE("GPL");
 420 MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
 421 MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");