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