sound/soc/samsung/idma.c

   1 /*
   2  * sound/soc/samsung/idma.c
   3  *
   4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com
   6  *
   7  * I2S0's Internal DMA driver
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14 #include <linux/interrupt.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/slab.h>
  18 #include <sound/pcm.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/soc.h>
  21
  22 #include "i2s.h"
  23 #include "idma.h"
  24 #include "dma.h"
  25 #include "i2s-regs.h"
  26
  27 #define ST_RUNNING              (1<<0)
  28 #define ST_OPENED               (1<<1)
  29
  30 static const struct snd_pcm_hardware idma_hardware = {
  31         .info = SNDRV_PCM_INFO_INTERLEAVED |
  32                     SNDRV_PCM_INFO_BLOCK_TRANSFER |
  33                     SNDRV_PCM_INFO_MMAP |
  34                     SNDRV_PCM_INFO_MMAP_VALID |
  35                     SNDRV_PCM_INFO_PAUSE |
  36                     SNDRV_PCM_INFO_RESUME,
  37         .formats = SNDRV_PCM_FMTBIT_S16_LE |
  38                     SNDRV_PCM_FMTBIT_U16_LE |
  39                     SNDRV_PCM_FMTBIT_S24_LE |
  40                     SNDRV_PCM_FMTBIT_U24_LE |
  41                     SNDRV_PCM_FMTBIT_U8 |
  42                     SNDRV_PCM_FMTBIT_S8,
  43         .channels_min = 2,
  44         .channels_max = 2,
  45         .buffer_bytes_max = MAX_IDMA_BUFFER,
  46         .period_bytes_min = 128,
  47         .period_bytes_max = MAX_IDMA_PERIOD,
  48         .periods_min = 1,
  49         .periods_max = 2,
  50 };
  51
  52 struct idma_ctrl {
  53         spinlock_t      lock;
  54         int             state;
  55         dma_addr_t      start;
  56         dma_addr_t      pos;
  57         dma_addr_t      end;
  58         dma_addr_t      period;
  59         dma_addr_t      periodsz;
  60         void            *token;
  61         void            (*cb)(void *dt, int bytes_xfer);
  62 };
  63
  64 static struct idma_info {
  65         spinlock_t      lock;
  66         void             __iomem  *regs;
  67         dma_addr_t      lp_tx_addr;
  68 } idma;
  69
  70 static void idma_getpos(dma_addr_t *src)
  71 {
  72         *src = idma.lp_tx_addr +
  73                 (readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;
  74 }
  75
  76 static int idma_enqueue(struct snd_pcm_substream *substream)
  77 {
  78         struct snd_pcm_runtime *runtime = substream->runtime;
  79         struct idma_ctrl *prtd = substream->runtime->private_data;
  80         u32 val;
  81
  82         spin_lock(&prtd->lock);
  83         prtd->token = (void *) substream;
  84         spin_unlock(&prtd->lock);
  85
  86         /* Internal DMA Level0 Interrupt Address */
  87         val = idma.lp_tx_addr + prtd->periodsz;
  88         writel(val, idma.regs + I2SLVL0ADDR);
  89
  90         /* Start address0 of I2S internal DMA operation. */
  91         val = idma.lp_tx_addr;
  92         writel(val, idma.regs + I2SSTR0);
  93
  94         /*
  95          * Transfer block size for I2S internal DMA.
  96          * Should decide transfer size before start dma operation
  97          */
  98         val = readl(idma.regs + I2SSIZE);
  99         val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);
 100         val |= (((runtime->dma_bytes >> 2) &
 101                         I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);
 102         writel(val, idma.regs + I2SSIZE);
 103
 104         val = readl(idma.regs + I2SAHB);
 105         val |= AHB_INTENLVL0;
 106         writel(val, idma.regs + I2SAHB);
 107
 108         return 0;
 109 }
 110
 111 static void idma_setcallbk(struct snd_pcm_substream *substream,
 112                                 void (*cb)(void *, int))
 113 {
 114         struct idma_ctrl *prtd = substream->runtime->private_data;
 115
 116         spin_lock(&prtd->lock);
 117         prtd->cb = cb;
 118         spin_unlock(&prtd->lock);
 119 }
 120
 121 static void idma_control(int op)
 122 {
 123         u32 val = readl(idma.regs + I2SAHB);
 124
 125         spin_lock(&idma.lock);
 126
 127         switch (op) {
 128         case LPAM_DMA_START:
 129                 val |= (AHB_INTENLVL0 | AHB_DMAEN);
 130                 break;
 131         case LPAM_DMA_STOP:
 132                 val &= ~(AHB_INTENLVL0 | AHB_DMAEN);
 133                 break;
 134         default:
 135                 spin_unlock(&idma.lock);
 136                 return;
 137         }
 138
 139         writel(val, idma.regs + I2SAHB);
 140         spin_unlock(&idma.lock);
 141 }
 142
 143 static void idma_done(void *id, int bytes_xfer)
 144 {
 145         struct snd_pcm_substream *substream = id;
 146         struct idma_ctrl *prtd = substream->runtime->private_data;
 147
 148         if (prtd && (prtd->state & ST_RUNNING))
 149                 snd_pcm_period_elapsed(substream);
 150 }
 151
 152 static int idma_hw_params(struct snd_pcm_substream *substream,
 153                                 struct snd_pcm_hw_params *params)
 154 {
 155         struct snd_pcm_runtime *runtime = substream->runtime;
 156         struct idma_ctrl *prtd = substream->runtime->private_data;
 157         u32 mod = readl(idma.regs + I2SMOD);
 158         u32 ahb = readl(idma.regs + I2SAHB);
 159
 160         ahb |= (AHB_DMARLD | AHB_INTMASK);
 161         mod |= MOD_TXS_IDMA;
 162         writel(ahb, idma.regs + I2SAHB);
 163         writel(mod, idma.regs + I2SMOD);
 164
 165         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 166         runtime->dma_bytes = params_buffer_bytes(params);
 167
 168         prtd->start = prtd->pos = runtime->dma_addr;
 169         prtd->period = params_periods(params);
 170         prtd->periodsz = params_period_bytes(params);
 171         prtd->end = runtime->dma_addr + runtime->dma_bytes;
 172
 173         idma_setcallbk(substream, idma_done);
 174
 175         return 0;
 176 }
 177
 178 static int idma_hw_free(struct snd_pcm_substream *substream)
 179 {
 180         snd_pcm_set_runtime_buffer(substream, NULL);
 181
 182         return 0;
 183 }
 184
 185 static int idma_prepare(struct snd_pcm_substream *substream)
 186 {
 187         struct idma_ctrl *prtd = substream->runtime->private_data;
 188
 189         prtd->pos = prtd->start;
 190
 191         /* flush the DMA channel */
 192         idma_control(LPAM_DMA_STOP);
 193         idma_enqueue(substream);
 194
 195         return 0;
 196 }
 197
 198 static int idma_trigger(struct snd_pcm_substream *substream, int cmd)
 199 {
 200         struct idma_ctrl *prtd = substream->runtime->private_data;
 201         int ret = 0;
 202
 203         spin_lock(&prtd->lock);
 204
 205         switch (cmd) {
 206         case SNDRV_PCM_TRIGGER_RESUME:
 207         case SNDRV_PCM_TRIGGER_START:
 208         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 209                 prtd->state |= ST_RUNNING;
 210                 idma_control(LPAM_DMA_START);
 211                 break;
 212
 213         case SNDRV_PCM_TRIGGER_SUSPEND:
 214         case SNDRV_PCM_TRIGGER_STOP:
 215         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 216                 prtd->state &= ~ST_RUNNING;
 217                 idma_control(LPAM_DMA_STOP);
 218                 break;
 219
 220         default:
 221                 ret = -EINVAL;
 222                 break;
 223         }
 224
 225         spin_unlock(&prtd->lock);
 226
 227         return ret;
 228 }
 229
 230 static snd_pcm_uframes_t
 231         idma_pointer(struct snd_pcm_substream *substream)
 232 {
 233         struct snd_pcm_runtime *runtime = substream->runtime;
 234         struct idma_ctrl *prtd = runtime->private_data;
 235         dma_addr_t src;
 236         unsigned long res;
 237
 238         spin_lock(&prtd->lock);
 239
 240         idma_getpos(&src);
 241         res = src - prtd->start;
 242
 243         spin_unlock(&prtd->lock);
 244
 245         return bytes_to_frames(substream->runtime, res);
 246 }
 247
 248 static int idma_mmap(struct snd_pcm_substream *substream,
 249         struct vm_area_struct *vma)
 250 {
 251         struct snd_pcm_runtime *runtime = substream->runtime;
 252         unsigned long size, offset;
 253         int ret;
 254
 255         /* From snd_pcm_lib_mmap_iomem */
 256         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 257         vma->vm_flags |= VM_IO;
 258         size = vma->vm_end - vma->vm_start;
 259         offset = vma->vm_pgoff << PAGE_SHIFT;
 260         ret = io_remap_pfn_range(vma, vma->vm_start,
 261                         (runtime->dma_addr + offset) >> PAGE_SHIFT,
 262                         size, vma->vm_page_prot);
 263
 264         return ret;
 265 }
 266
 267 static irqreturn_t iis_irq(int irqno, void *dev_id)
 268 {
 269         struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;
 270         u32 iiscon, iisahb, val, addr;
 271
 272         iisahb  = readl(idma.regs + I2SAHB);
 273         iiscon  = readl(idma.regs + I2SCON);
 274
 275         val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;
 276
 277         if (val) {
 278                 iisahb |= val;
 279                 writel(iisahb, idma.regs + I2SAHB);
 280
 281                 addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;
 282                 addr += prtd->periodsz;
 283                 addr %= (prtd->end - prtd->start);
 284                 addr += idma.lp_tx_addr;
 285
 286                 writel(addr, idma.regs + I2SLVL0ADDR);
 287
 288                 if (prtd->cb)
 289                         prtd->cb(prtd->token, prtd->period);
 290         }
 291
 292         return IRQ_HANDLED;
 293 }
 294
 295 static int idma_open(struct snd_pcm_substream *substream)
 296 {
 297         struct snd_pcm_runtime *runtime = substream->runtime;
 298         struct idma_ctrl *prtd;
 299         int ret;
 300
 301         snd_soc_set_runtime_hwparams(substream, &idma_hardware);
 302
 303         prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);
 304         if (prtd == NULL)
 305                 return -ENOMEM;
 306
 307         ret = request_irq(IRQ_I2S0, iis_irq, 0, "i2s", prtd);
 308         if (ret < 0) {
 309                 pr_err("fail to claim i2s irq , ret = %d\n", ret);
 310                 kfree(prtd);
 311                 return ret;
 312         }
 313
 314         spin_lock_init(&prtd->lock);
 315
 316         runtime->private_data = prtd;
 317
 318         return 0;
 319 }
 320
 321 static int idma_close(struct snd_pcm_substream *substream)
 322 {
 323         struct snd_pcm_runtime *runtime = substream->runtime;
 324         struct idma_ctrl *prtd = runtime->private_data;
 325
 326         free_irq(IRQ_I2S0, prtd);
 327
 328         if (!prtd)
 329                 pr_err("idma_close called with prtd == NULL\n");
 330
 331         kfree(prtd);
 332
 333         return 0;
 334 }
 335
 336 static struct snd_pcm_ops idma_ops = {
 337         .open           = idma_open,
 338         .close          = idma_close,
 339         .ioctl          = snd_pcm_lib_ioctl,
 340         .trigger        = idma_trigger,
 341         .pointer        = idma_pointer,
 342         .mmap           = idma_mmap,
 343         .hw_params      = idma_hw_params,
 344         .hw_free        = idma_hw_free,
 345         .prepare        = idma_prepare,
 346 };
 347
 348 static void idma_free(struct snd_pcm *pcm)
 349 {
 350         struct snd_pcm_substream *substream;
 351         struct snd_dma_buffer *buf;
 352
 353         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 354         if (!substream)
 355                 return;
 356
 357         buf = &substream->dma_buffer;
 358         if (!buf->area)
 359                 return;
 360
 361         iounmap(buf->area);
 362
 363         buf->area = NULL;
 364         buf->addr = 0;
 365 }
 366
 367 static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
 368 {
 369         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 370         struct snd_dma_buffer *buf = &substream->dma_buffer;
 371
 372         buf->dev.dev = pcm->card->dev;
 373         buf->private_data = NULL;
 374
 375         /* Assign PCM buffer pointers */
 376         buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;
 377         buf->addr = idma.lp_tx_addr;
 378         buf->bytes = idma_hardware.buffer_bytes_max;
 379         buf->area = (unsigned char *)ioremap(buf->addr, buf->bytes);
 380
 381         return 0;
 382 }
 383
 384 static u64 idma_mask = DMA_BIT_MASK(32);
 385
 386 static int idma_new(struct snd_soc_pcm_runtime *rtd)
 387 {
 388         struct snd_card *card = rtd->card->snd_card;
 389         struct snd_soc_dai *dai = rtd->cpu_dai;
 390         struct snd_pcm *pcm = rtd->pcm;
 391         int ret = 0;
 392
 393         if (!card->dev->dma_mask)
 394                 card->dev->dma_mask = &idma_mask;
 395         if (!card->dev->coherent_dma_mask)
 396                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 397
 398         if (dai->driver->playback.channels_min)
 399                 ret = preallocate_idma_buffer(pcm,
 400                                 SNDRV_PCM_STREAM_PLAYBACK);
 401
 402         return ret;
 403 }
 404
 405 void idma_reg_addr_init(void *regs, dma_addr_t addr)
 406 {
 407         spin_lock_init(&idma.lock);
 408         idma.regs = regs;
 409         idma.lp_tx_addr = addr;
 410 }
 411
 412 struct snd_soc_platform_driver asoc_idma_platform = {
 413         .ops = &idma_ops,
 414         .pcm_new = idma_new,
 415         .pcm_free = idma_free,
 416 };
 417
 418 static int __devinit asoc_idma_platform_probe(struct platform_device *pdev)
 419 {
 420         return snd_soc_register_platform(&pdev->dev, &asoc_idma_platform);
 421 }
 422
 423 static int __devexit asoc_idma_platform_remove(struct platform_device *pdev)
 424 {
 425         snd_soc_unregister_platform(&pdev->dev);
 426         return 0;
 427 }
 428
 429 static struct platform_driver asoc_idma_driver = {
 430         .driver = {
 431                 .name = "samsung-idma",
 432                 .owner = THIS_MODULE,
 433         },
 434
 435         .probe = asoc_idma_platform_probe,
 436         .remove = __devexit_p(asoc_idma_platform_remove),
 437 };
 438
 439 static int __init asoc_idma_init(void)
 440 {
 441         return platform_driver_register(&asoc_idma_driver);
 442 }
 443 module_init(asoc_idma_init);
 444
 445 static void __exit asoc_idma_exit(void)
 446 {
 447         platform_driver_unregister(&asoc_idma_driver);
 448 }
 449 module_exit(asoc_idma_exit);
 450
 451 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
 452 MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");
 453 MODULE_LICENSE("GPL");