ASoC: atmel-pcm: split into two file
authorBo Shen <voice.shen@atmel.com>
Wed, 28 Nov 2012 03:46:12 +0000 (11:46 +0800)
committerMark Brown <broonie@opensource.wolfsonmicro.com>
Sun, 2 Dec 2012 04:27:44 +0000 (13:27 +0900)
This patch is split original atmel-pcm.c into new atmel-pcm.c and
atmel-pcm-pdc.c two files. The new atmel-pcm.c is the share routine
while will be used for pdc or dma transfer.

Using SND_ATMEL_SOC_PDC to select using PDC for audio transfer

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
sound/soc/atmel/Kconfig
sound/soc/atmel/Makefile
sound/soc/atmel/atmel-pcm-pdc.c [new file with mode: 0644]
sound/soc/atmel/atmel-pcm.c
sound/soc/atmel/atmel-pcm.h
sound/soc/atmel/atmel_ssc_dai.c

index 397ec7526a5a158150dd484bcbf692e60504fb84..6051993eca919ee15deef1906ed86b86c0f29c15 100644 (file)
@@ -6,6 +6,10 @@ config SND_ATMEL_SOC
          the ATMEL SSC interface. You will also need
          to select the audio interfaces to support below.
 
+config SND_ATMEL_SOC_PDC
+       tristate
+       depends on SND_ATMEL_SOC
+
 config SND_ATMEL_SOC_SSC
        tristate
        depends on SND_ATMEL_SOC
@@ -17,6 +21,7 @@ config SND_ATMEL_SOC_SSC
 config SND_AT91_SOC_SAM9G20_WM8731
        tristate "SoC Audio support for WM8731-based At91sam9g20 evaluation board"
        depends on ATMEL_SSC && SND_ATMEL_SOC && AT91_PROGRAMMABLE_CLOCKS
+       select SND_ATMEL_SOC_PDC
        select SND_ATMEL_SOC_SSC
        select SND_SOC_WM8731
        help
index a5c0bf19da78f01e823fc614c61528c30272a67c..2e37864ee860f28ef3e9cdf924d8927c25725682 100644 (file)
@@ -1,8 +1,10 @@
 # AT91 Platform Support
 snd-soc-atmel-pcm-objs := atmel-pcm.o
+snd-soc-atmel-pcm-pdc-objs := atmel-pcm-pdc.o
 snd-soc-atmel_ssc_dai-objs := atmel_ssc_dai.o
 
 obj-$(CONFIG_SND_ATMEL_SOC) += snd-soc-atmel-pcm.o
+obj-$(CONFIG_SND_ATMEL_SOC_PDC) += snd-soc-atmel-pcm-pdc.o
 obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel_ssc_dai.o
 
 # AT91 Machine Support
diff --git a/sound/soc/atmel/atmel-pcm-pdc.c b/sound/soc/atmel/atmel-pcm-pdc.c
new file mode 100644 (file)
index 0000000..6a293c7
--- /dev/null
@@ -0,0 +1,401 @@
+/*
+ * atmel-pcm.c  --  ALSA PCM interface for the Atmel atmel SoC.
+ *
+ *  Copyright (C) 2005 SAN People
+ *  Copyright (C) 2008 Atmel
+ *
+ * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
+ *
+ * Based on at91-pcm. by:
+ * Frank Mandarino <fmandarino@endrelia.com>
+ * Copyright 2006 Endrelia Technologies Inc.
+ *
+ * Based on pxa2xx-pcm.c by:
+ *
+ * Author:     Nicolas Pitre
+ * Created:    Nov 30, 2004
+ * Copyright:  (C) 2004 MontaVista Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/atmel_pdc.h>
+#include <linux/atmel-ssc.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "atmel-pcm.h"
+
+
+/*--------------------------------------------------------------------------*\
+ * Hardware definition
+\*--------------------------------------------------------------------------*/
+/* TODO: These values were taken from the AT91 platform driver, check
+ *      them against real values for AT32
+ */
+static const struct snd_pcm_hardware atmel_pcm_hardware = {
+       .info                   = SNDRV_PCM_INFO_MMAP |
+                                 SNDRV_PCM_INFO_MMAP_VALID |
+                                 SNDRV_PCM_INFO_INTERLEAVED |
+                                 SNDRV_PCM_INFO_PAUSE,
+       .formats                = SNDRV_PCM_FMTBIT_S16_LE,
+       .period_bytes_min       = 32,
+       .period_bytes_max       = 8192,
+       .periods_min            = 2,
+       .periods_max            = 1024,
+       .buffer_bytes_max       = ATMEL_SSC_DMABUF_SIZE,
+};
+
+
+/*--------------------------------------------------------------------------*\
+ * Data types
+\*--------------------------------------------------------------------------*/
+struct atmel_runtime_data {
+       struct atmel_pcm_dma_params *params;
+       dma_addr_t dma_buffer;          /* physical address of dma buffer */
+       dma_addr_t dma_buffer_end;      /* first address beyond DMA buffer */
+       size_t period_size;
+
+       dma_addr_t period_ptr;          /* physical address of next period */
+
+       /* PDC register save */
+       u32 pdc_xpr_save;
+       u32 pdc_xcr_save;
+       u32 pdc_xnpr_save;
+       u32 pdc_xncr_save;
+};
+
+/*--------------------------------------------------------------------------*\
+ * ISR
+\*--------------------------------------------------------------------------*/
+static void atmel_pcm_dma_irq(u32 ssc_sr,
+       struct snd_pcm_substream *substream)
+{
+       struct atmel_runtime_data *prtd = substream->runtime->private_data;
+       struct atmel_pcm_dma_params *params = prtd->params;
+       static int count;
+
+       count++;
+
+       if (ssc_sr & params->mask->ssc_endbuf) {
+               pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n",
+                               substream->stream == SNDRV_PCM_STREAM_PLAYBACK
+                               ? "underrun" : "overrun",
+                               params->name, ssc_sr, count);
+
+               /* re-start the PDC */
+               ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
+                          params->mask->pdc_disable);
+               prtd->period_ptr += prtd->period_size;
+               if (prtd->period_ptr >= prtd->dma_buffer_end)
+                       prtd->period_ptr = prtd->dma_buffer;
+
+               ssc_writex(params->ssc->regs, params->pdc->xpr,
+                          prtd->period_ptr);
+               ssc_writex(params->ssc->regs, params->pdc->xcr,
+                          prtd->period_size / params->pdc_xfer_size);
+               ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
+                          params->mask->pdc_enable);
+       }
+
+       if (ssc_sr & params->mask->ssc_endx) {
+               /* Load the PDC next pointer and counter registers */
+               prtd->period_ptr += prtd->period_size;
+               if (prtd->period_ptr >= prtd->dma_buffer_end)
+                       prtd->period_ptr = prtd->dma_buffer;
+
+               ssc_writex(params->ssc->regs, params->pdc->xnpr,
+                          prtd->period_ptr);
+               ssc_writex(params->ssc->regs, params->pdc->xncr,
+                          prtd->period_size / params->pdc_xfer_size);
+       }
+
+       snd_pcm_period_elapsed(substream);
+}
+
+
+/*--------------------------------------------------------------------------*\
+ * PCM operations
+\*--------------------------------------------------------------------------*/
+static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
+       struct snd_pcm_hw_params *params)
+{
+       struct snd_pcm_runtime *runtime = substream->runtime;
+       struct atmel_runtime_data *prtd = runtime->private_data;
+       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+       /* this may get called several times by oss emulation
+        * with different params */
+
+       snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+       runtime->dma_bytes = params_buffer_bytes(params);
+
+       prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+       prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
+
+       prtd->dma_buffer = runtime->dma_addr;
+       prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
+       prtd->period_size = params_period_bytes(params);
+
+       pr_debug("atmel-pcm: "
+               "hw_params: DMA for %s initialized "
+               "(dma_bytes=%u, period_size=%u)\n",
+               prtd->params->name,
+               runtime->dma_bytes,
+               prtd->period_size);
+       return 0;
+}
+
+static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+       struct atmel_runtime_data *prtd = substream->runtime->private_data;
+       struct atmel_pcm_dma_params *params = prtd->params;
+
+       if (params != NULL) {
+               ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
+                          params->mask->pdc_disable);
+               prtd->params->dma_intr_handler = NULL;
+       }
+
+       return 0;
+}
+
+static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
+{
+       struct atmel_runtime_data *prtd = substream->runtime->private_data;
+       struct atmel_pcm_dma_params *params = prtd->params;
+
+       ssc_writex(params->ssc->regs, SSC_IDR,
+                  params->mask->ssc_endx | params->mask->ssc_endbuf);
+       ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
+                  params->mask->pdc_disable);
+       return 0;
+}
+
+static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
+       int cmd)
+{
+       struct snd_pcm_runtime *rtd = substream->runtime;
+       struct atmel_runtime_data *prtd = rtd->private_data;
+       struct atmel_pcm_dma_params *params = prtd->params;
+       int ret = 0;
+
+       pr_debug("atmel-pcm:buffer_size = %ld,"
+               "dma_area = %p, dma_bytes = %u\n",
+               rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
+
+       switch (cmd) {
+       case SNDRV_PCM_TRIGGER_START:
+               prtd->period_ptr = prtd->dma_buffer;
+
+               ssc_writex(params->ssc->regs, params->pdc->xpr,
+                          prtd->period_ptr);
+               ssc_writex(params->ssc->regs, params->pdc->xcr,
+                          prtd->period_size / params->pdc_xfer_size);
+
+               prtd->period_ptr += prtd->period_size;
+               ssc_writex(params->ssc->regs, params->pdc->xnpr,
+                          prtd->period_ptr);
+               ssc_writex(params->ssc->regs, params->pdc->xncr,
+                          prtd->period_size / params->pdc_xfer_size);
+
+               pr_debug("atmel-pcm: trigger: "
+                       "period_ptr=%lx, xpr=%u, "
+                       "xcr=%u, xnpr=%u, xncr=%u\n",
+                       (unsigned long)prtd->period_ptr,
+                       ssc_readx(params->ssc->regs, params->pdc->xpr),
+                       ssc_readx(params->ssc->regs, params->pdc->xcr),
+                       ssc_readx(params->ssc->regs, params->pdc->xnpr),
+                       ssc_readx(params->ssc->regs, params->pdc->xncr));
+
+               ssc_writex(params->ssc->regs, SSC_IER,
+                          params->mask->ssc_endx | params->mask->ssc_endbuf);
+               ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
+                          params->mask->pdc_enable);
+
+               pr_debug("sr=%u imr=%u\n",
+                       ssc_readx(params->ssc->regs, SSC_SR),
+                       ssc_readx(params->ssc->regs, SSC_IER));
+               break;          /* SNDRV_PCM_TRIGGER_START */
+
+       case SNDRV_PCM_TRIGGER_STOP:
+       case SNDRV_PCM_TRIGGER_SUSPEND:
+       case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+               ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
+                          params->mask->pdc_disable);
+               break;
+
+       case SNDRV_PCM_TRIGGER_RESUME:
+       case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+               ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
+                          params->mask->pdc_enable);
+               break;
+
+       default:
+               ret = -EINVAL;
+       }
+
+       return ret;
+}
+
+static snd_pcm_uframes_t atmel_pcm_pointer(
+       struct snd_pcm_substream *substream)
+{
+       struct snd_pcm_runtime *runtime = substream->runtime;
+       struct atmel_runtime_data *prtd = runtime->private_data;
+       struct atmel_pcm_dma_params *params = prtd->params;
+       dma_addr_t ptr;
+       snd_pcm_uframes_t x;
+
+       ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
+       x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
+
+       if (x == runtime->buffer_size)
+               x = 0;
+
+       return x;
+}
+
+static int atmel_pcm_open(struct snd_pcm_substream *substream)
+{
+       struct snd_pcm_runtime *runtime = substream->runtime;
+       struct atmel_runtime_data *prtd;
+       int ret = 0;
+
+       snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
+
+       /* ensure that buffer size is a multiple of period size */
+       ret = snd_pcm_hw_constraint_integer(runtime,
+                                               SNDRV_PCM_HW_PARAM_PERIODS);
+       if (ret < 0)
+               goto out;
+
+       prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
+       if (prtd == NULL) {
+               ret = -ENOMEM;
+               goto out;
+       }
+       runtime->private_data = prtd;
+
+ out:
+       return ret;
+}
+
+static int atmel_pcm_close(struct snd_pcm_substream *substream)
+{
+       struct atmel_runtime_data *prtd = substream->runtime->private_data;
+
+       kfree(prtd);
+       return 0;
+}
+
+static struct snd_pcm_ops atmel_pcm_ops = {
+       .open           = atmel_pcm_open,
+       .close          = atmel_pcm_close,
+       .ioctl          = snd_pcm_lib_ioctl,
+       .hw_params      = atmel_pcm_hw_params,
+       .hw_free        = atmel_pcm_hw_free,
+       .prepare        = atmel_pcm_prepare,
+       .trigger        = atmel_pcm_trigger,
+       .pointer        = atmel_pcm_pointer,
+       .mmap           = atmel_pcm_mmap,
+};
+
+
+/*--------------------------------------------------------------------------*\
+ * ASoC platform driver
+\*--------------------------------------------------------------------------*/
+#ifdef CONFIG_PM
+static int atmel_pcm_suspend(struct snd_soc_dai *dai)
+{
+       struct snd_pcm_runtime *runtime = dai->runtime;
+       struct atmel_runtime_data *prtd;
+       struct atmel_pcm_dma_params *params;
+
+       if (!runtime)
+               return 0;
+
+       prtd = runtime->private_data;
+       params = prtd->params;
+
+       /* disable the PDC and save the PDC registers */
+
+       ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);
+
+       prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
+       prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
+       prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
+       prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);
+
+       return 0;
+}
+
+static int atmel_pcm_resume(struct snd_soc_dai *dai)
+{
+       struct snd_pcm_runtime *runtime = dai->runtime;
+       struct atmel_runtime_data *prtd;
+       struct atmel_pcm_dma_params *params;
+
+       if (!runtime)
+               return 0;
+
+       prtd = runtime->private_data;
+       params = prtd->params;
+
+       /* restore the PDC registers and enable the PDC */
+       ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
+       ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
+       ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
+       ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
+
+       ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
+       return 0;
+}
+#else
+#define atmel_pcm_suspend      NULL
+#define atmel_pcm_resume       NULL
+#endif
+
+static struct snd_soc_platform_driver atmel_soc_platform = {
+       .ops            = &atmel_pcm_ops,
+       .pcm_new        = atmel_pcm_new,
+       .pcm_free       = atmel_pcm_free,
+       .suspend        = atmel_pcm_suspend,
+       .resume         = atmel_pcm_resume,
+};
+
+int atmel_pcm_pdc_platform_register(struct device *dev)
+{
+       return snd_soc_register_platform(dev, &atmel_soc_platform);
+}
+EXPORT_SYMBOL(atmel_pcm_pdc_platform_register);
+
+void atmel_pcm_pdc_platform_unregister(struct device *dev)
+{
+       snd_soc_unregister_platform(dev);
+}
+EXPORT_SYMBOL(atmel_pcm_pdc_platform_unregister);
+
+MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
+MODULE_DESCRIPTION("Atmel PCM module");
+MODULE_LICENSE("GPL");
index 40e17d13d78abc9549c2d21c757bbffcb65d4479..e99f1811300aef179a5c1d5c33dc702249175681 100644 (file)
  */
 
 #include <linux/module.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
 #include <linux/dma-mapping.h>
-#include <linux/atmel_pdc.h>
-#include <linux/atmel-ssc.h>
-
-#include <sound/core.h>
 #include <sound/pcm.h>
-#include <sound/pcm_params.h>
 #include <sound/soc.h>
-
 #include "atmel-pcm.h"
 
-
-/*--------------------------------------------------------------------------*\
- * Hardware definition
-\*--------------------------------------------------------------------------*/
-/* TODO: These values were taken from the AT91 platform driver, check
- *      them against real values for AT32
- */
-static const struct snd_pcm_hardware atmel_pcm_hardware = {
-       .info                   = SNDRV_PCM_INFO_MMAP |
-                                 SNDRV_PCM_INFO_MMAP_VALID |
-                                 SNDRV_PCM_INFO_INTERLEAVED |
-                                 SNDRV_PCM_INFO_PAUSE,
-       .formats                = SNDRV_PCM_FMTBIT_S16_LE,
-       .period_bytes_min       = 32,
-       .period_bytes_max       = 8192,
-       .periods_min            = 2,
-       .periods_max            = 1024,
-       .buffer_bytes_max       = 32 * 1024,
-};
-
-
-/*--------------------------------------------------------------------------*\
- * Data types
-\*--------------------------------------------------------------------------*/
-struct atmel_runtime_data {
-       struct atmel_pcm_dma_params *params;
-       dma_addr_t dma_buffer;          /* physical address of dma buffer */
-       dma_addr_t dma_buffer_end;      /* first address beyond DMA buffer */
-       size_t period_size;
-
-       dma_addr_t period_ptr;          /* physical address of next period */
-
-       /* PDC register save */
-       u32 pdc_xpr_save;
-       u32 pdc_xcr_save;
-       u32 pdc_xnpr_save;
-       u32 pdc_xncr_save;
-};
-
-
-/*--------------------------------------------------------------------------*\
- * Helper functions
-\*--------------------------------------------------------------------------*/
 static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
        int stream)
 {
        struct snd_pcm_substream *substream = pcm->streams[stream].substream;
        struct snd_dma_buffer *buf = &substream->dma_buffer;
-       size_t size = atmel_pcm_hardware.buffer_bytes_max;
+       size_t size = ATMEL_SSC_DMABUF_SIZE;
 
        buf->dev.type = SNDRV_DMA_TYPE_DEV;
        buf->dev.dev = pcm->card->dev;
        buf->private_data = NULL;
        buf->area = dma_alloc_coherent(pcm->card->dev, size,
-                                         &buf->addr, GFP_KERNEL);
-       pr_debug("atmel-pcm:"
-               "preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
-               (void *) buf->area,
-               (void *) buf->addr,
-               size);
+                       &buf->addr, GFP_KERNEL);
+       pr_debug("atmel-pcm: alloc dma buffer: area=%p, addr=%p, size=%d\n",
+                       (void *)buf->area, (void *)buf->addr, size);
 
        if (!buf->area)
                return -ENOMEM;
@@ -113,258 +58,19 @@ static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
        buf->bytes = size;
        return 0;
 }
-/*--------------------------------------------------------------------------*\
- * ISR
-\*--------------------------------------------------------------------------*/
-static void atmel_pcm_dma_irq(u32 ssc_sr,
-       struct snd_pcm_substream *substream)
-{
-       struct atmel_runtime_data *prtd = substream->runtime->private_data;
-       struct atmel_pcm_dma_params *params = prtd->params;
-       static int count;
-
-       count++;
-
-       if (ssc_sr & params->mask->ssc_endbuf) {
-               pr_warning("atmel-pcm: buffer %s on %s"
-                               " (SSC_SR=%#x, count=%d)\n",
-                               substream->stream == SNDRV_PCM_STREAM_PLAYBACK
-                               ? "underrun" : "overrun",
-                               params->name, ssc_sr, count);
-
-               /* re-start the PDC */
-               ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
-                          params->mask->pdc_disable);
-               prtd->period_ptr += prtd->period_size;
-               if (prtd->period_ptr >= prtd->dma_buffer_end)
-                       prtd->period_ptr = prtd->dma_buffer;
-
-               ssc_writex(params->ssc->regs, params->pdc->xpr,
-                          prtd->period_ptr);
-               ssc_writex(params->ssc->regs, params->pdc->xcr,
-                          prtd->period_size / params->pdc_xfer_size);
-               ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
-                          params->mask->pdc_enable);
-       }
-
-       if (ssc_sr & params->mask->ssc_endx) {
-               /* Load the PDC next pointer and counter registers */
-               prtd->period_ptr += prtd->period_size;
-               if (prtd->period_ptr >= prtd->dma_buffer_end)
-                       prtd->period_ptr = prtd->dma_buffer;
-
-               ssc_writex(params->ssc->regs, params->pdc->xnpr,
-                          prtd->period_ptr);
-               ssc_writex(params->ssc->regs, params->pdc->xncr,
-                          prtd->period_size / params->pdc_xfer_size);
-       }
-
-       snd_pcm_period_elapsed(substream);
-}
-
-
-/*--------------------------------------------------------------------------*\
- * PCM operations
-\*--------------------------------------------------------------------------*/
-static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
-       struct snd_pcm_hw_params *params)
-{
-       struct snd_pcm_runtime *runtime = substream->runtime;
-       struct atmel_runtime_data *prtd = runtime->private_data;
-       struct snd_soc_pcm_runtime *rtd = substream->private_data;
-
-       /* this may get called several times by oss emulation
-        * with different params */
-
-       snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-       runtime->dma_bytes = params_buffer_bytes(params);
-
-       prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
-       prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
-
-       prtd->dma_buffer = runtime->dma_addr;
-       prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
-       prtd->period_size = params_period_bytes(params);
-
-       pr_debug("atmel-pcm: "
-               "hw_params: DMA for %s initialized "
-               "(dma_bytes=%u, period_size=%u)\n",
-               prtd->params->name,
-               runtime->dma_bytes,
-               prtd->period_size);
-       return 0;
-}
-
-static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
-{
-       struct atmel_runtime_data *prtd = substream->runtime->private_data;
-       struct atmel_pcm_dma_params *params = prtd->params;
-
-       if (params != NULL) {
-               ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
-                          params->mask->pdc_disable);
-               prtd->params->dma_intr_handler = NULL;
-       }
-
-       return 0;
-}
-
-static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
-{
-       struct atmel_runtime_data *prtd = substream->runtime->private_data;
-       struct atmel_pcm_dma_params *params = prtd->params;
-
-       ssc_writex(params->ssc->regs, SSC_IDR,
-                  params->mask->ssc_endx | params->mask->ssc_endbuf);
-       ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
-                  params->mask->pdc_disable);
-       return 0;
-}
-
-static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
-       int cmd)
-{
-       struct snd_pcm_runtime *rtd = substream->runtime;
-       struct atmel_runtime_data *prtd = rtd->private_data;
-       struct atmel_pcm_dma_params *params = prtd->params;
-       int ret = 0;
-
-       pr_debug("atmel-pcm:buffer_size = %ld,"
-               "dma_area = %p, dma_bytes = %u\n",
-               rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
-
-       switch (cmd) {
-       case SNDRV_PCM_TRIGGER_START:
-               prtd->period_ptr = prtd->dma_buffer;
-
-               ssc_writex(params->ssc->regs, params->pdc->xpr,
-                          prtd->period_ptr);
-               ssc_writex(params->ssc->regs, params->pdc->xcr,
-                          prtd->period_size / params->pdc_xfer_size);
-
-               prtd->period_ptr += prtd->period_size;
-               ssc_writex(params->ssc->regs, params->pdc->xnpr,
-                          prtd->period_ptr);
-               ssc_writex(params->ssc->regs, params->pdc->xncr,
-                          prtd->period_size / params->pdc_xfer_size);
-
-               pr_debug("atmel-pcm: trigger: "
-                       "period_ptr=%lx, xpr=%u, "
-                       "xcr=%u, xnpr=%u, xncr=%u\n",
-                       (unsigned long)prtd->period_ptr,
-                       ssc_readx(params->ssc->regs, params->pdc->xpr),
-                       ssc_readx(params->ssc->regs, params->pdc->xcr),
-                       ssc_readx(params->ssc->regs, params->pdc->xnpr),
-                       ssc_readx(params->ssc->regs, params->pdc->xncr));
-
-               ssc_writex(params->ssc->regs, SSC_IER,
-                          params->mask->ssc_endx | params->mask->ssc_endbuf);
-               ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
-                          params->mask->pdc_enable);
-
-               pr_debug("sr=%u imr=%u\n",
-                       ssc_readx(params->ssc->regs, SSC_SR),
-                       ssc_readx(params->ssc->regs, SSC_IER));
-               break;          /* SNDRV_PCM_TRIGGER_START */
-
-       case SNDRV_PCM_TRIGGER_STOP:
-       case SNDRV_PCM_TRIGGER_SUSPEND:
-       case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
-               ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
-                          params->mask->pdc_disable);
-               break;
-
-       case SNDRV_PCM_TRIGGER_RESUME:
-       case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
-               ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
-                          params->mask->pdc_enable);
-               break;
 
-       default:
-               ret = -EINVAL;
-       }
-
-       return ret;
-}
-
-static snd_pcm_uframes_t atmel_pcm_pointer(
-       struct snd_pcm_substream *substream)
-{
-       struct snd_pcm_runtime *runtime = substream->runtime;
-       struct atmel_runtime_data *prtd = runtime->private_data;
-       struct atmel_pcm_dma_params *params = prtd->params;
-       dma_addr_t ptr;
-       snd_pcm_uframes_t x;
-
-       ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
-       x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
-
-       if (x == runtime->buffer_size)
-               x = 0;
-
-       return x;
-}
-
-static int atmel_pcm_open(struct snd_pcm_substream *substream)
-{
-       struct snd_pcm_runtime *runtime = substream->runtime;
-       struct atmel_runtime_data *prtd;
-       int ret = 0;
-
-       snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
-
-       /* ensure that buffer size is a multiple of period size */
-       ret = snd_pcm_hw_constraint_integer(runtime,
-                                               SNDRV_PCM_HW_PARAM_PERIODS);
-       if (ret < 0)
-               goto out;
-
-       prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
-       if (prtd == NULL) {
-               ret = -ENOMEM;
-               goto out;
-       }
-       runtime->private_data = prtd;
-
- out:
-       return ret;
-}
-
-static int atmel_pcm_close(struct snd_pcm_substream *substream)
-{
-       struct atmel_runtime_data *prtd = substream->runtime->private_data;
-
-       kfree(prtd);
-       return 0;
-}
-
-static int atmel_pcm_mmap(struct snd_pcm_substream *substream,
+int atmel_pcm_mmap(struct snd_pcm_substream *substream,
        struct vm_area_struct *vma)
 {
        return remap_pfn_range(vma, vma->vm_start,
                       substream->dma_buffer.addr >> PAGE_SHIFT,
                       vma->vm_end - vma->vm_start, vma->vm_page_prot);
 }
+EXPORT_SYMBOL_GPL(atmel_pcm_mmap);
 
-static struct snd_pcm_ops atmel_pcm_ops = {
-       .open           = atmel_pcm_open,
-       .close          = atmel_pcm_close,
-       .ioctl          = snd_pcm_lib_ioctl,
-       .hw_params      = atmel_pcm_hw_params,
-       .hw_free        = atmel_pcm_hw_free,
-       .prepare        = atmel_pcm_prepare,
-       .trigger        = atmel_pcm_trigger,
-       .pointer        = atmel_pcm_pointer,
-       .mmap           = atmel_pcm_mmap,
-};
-
-
-/*--------------------------------------------------------------------------*\
- * ASoC platform driver
-\*--------------------------------------------------------------------------*/
 static u64 atmel_pcm_dmamask = DMA_BIT_MASK(32);
 
-static int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
+int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
 {
        struct snd_card *card = rtd->card->snd_card;
        struct snd_pcm *pcm = rtd->pcm;
@@ -376,6 +82,7 @@ static int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
                card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 
        if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+               pr_debug("atmel-pcm: allocating PCM playback DMA buffer\n");
                ret = atmel_pcm_preallocate_dma_buffer(pcm,
                        SNDRV_PCM_STREAM_PLAYBACK);
                if (ret)
@@ -383,8 +90,7 @@ static int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
        }
 
        if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
-               pr_debug("atmel-pcm:"
-                               "Allocating PCM capture DMA buffer\n");
+               pr_debug("atmel-pcm: allocating PCM capture DMA buffer\n");
                ret = atmel_pcm_preallocate_dma_buffer(pcm,
                        SNDRV_PCM_STREAM_CAPTURE);
                if (ret)
@@ -393,8 +99,9 @@ static int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
  out:
        return ret;
 }
+EXPORT_SYMBOL_GPL(atmel_pcm_new);
 
-static void atmel_pcm_free_dma_buffers(struct snd_pcm *pcm)
+void atmel_pcm_free(struct snd_pcm *pcm)
 {
        struct snd_pcm_substream *substream;
        struct snd_dma_buffer *buf;
@@ -413,78 +120,5 @@ static void atmel_pcm_free_dma_buffers(struct snd_pcm *pcm)
                buf->area = NULL;
        }
 }
+EXPORT_SYMBOL_GPL(atmel_pcm_free);
 
-#ifdef CONFIG_PM
-static int atmel_pcm_suspend(struct snd_soc_dai *dai)
-{
-       struct snd_pcm_runtime *runtime = dai->runtime;
-       struct atmel_runtime_data *prtd;
-       struct atmel_pcm_dma_params *params;
-
-       if (!runtime)
-               return 0;
-
-       prtd = runtime->private_data;
-       params = prtd->params;
-
-       /* disable the PDC and save the PDC registers */
-
-       ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);
-
-       prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
-       prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
-       prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
-       prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);
-
-       return 0;
-}
-
-static int atmel_pcm_resume(struct snd_soc_dai *dai)
-{
-       struct snd_pcm_runtime *runtime = dai->runtime;
-       struct atmel_runtime_data *prtd;
-       struct atmel_pcm_dma_params *params;
-
-       if (!runtime)
-               return 0;
-
-       prtd = runtime->private_data;
-       params = prtd->params;
-
-       /* restore the PDC registers and enable the PDC */
-       ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
-       ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
-       ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
-       ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
-
-       ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
-       return 0;
-}
-#else
-#define atmel_pcm_suspend      NULL
-#define atmel_pcm_resume       NULL
-#endif
-
-static struct snd_soc_platform_driver atmel_soc_platform = {
-       .ops            = &atmel_pcm_ops,
-       .pcm_new        = atmel_pcm_new,
-       .pcm_free       = atmel_pcm_free_dma_buffers,
-       .suspend        = atmel_pcm_suspend,
-       .resume         = atmel_pcm_resume,
-};
-
-int atmel_pcm_platform_register(struct device *dev)
-{
-       return snd_soc_register_platform(dev, &atmel_soc_platform);
-}
-EXPORT_SYMBOL(atmel_pcm_platform_register);
-
-void atmel_pcm_platform_unregister(struct device *dev)
-{
-       snd_soc_unregister_platform(dev);
-}
-EXPORT_SYMBOL(atmel_pcm_platform_unregister);
-
-MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
-MODULE_DESCRIPTION("Atmel PCM module");
-MODULE_LICENSE("GPL");
index e6d67b3dddd103c27eb4c34788d4f6ae17c45b24..6bd63b0e95e2d363f229717400bc9623548bce55 100644 (file)
@@ -36,6 +36,8 @@
 
 #include <linux/atmel-ssc.h>
 
+#define ATMEL_SSC_DMABUF_SIZE  (64 * 1024)
+
 /*
  * Registers and status bits that are required by the PCM driver.
  */
@@ -80,7 +82,22 @@ struct atmel_pcm_dma_params {
 #define ssc_readx(base, reg)            (__raw_readl((base) + (reg)))
 #define ssc_writex(base, reg, value)    __raw_writel((value), (base) + (reg))
 
-int atmel_pcm_platform_register(struct device *dev);
-void atmel_pcm_platform_unregister(struct device *dev);
+int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd);
+void atmel_pcm_free(struct snd_pcm *pcm);
+int atmel_pcm_mmap(struct snd_pcm_substream *substream,
+               struct vm_area_struct *vma);
+
+#ifdef CONFIG_SND_ATMEL_SOC_PDC
+int atmel_pcm_pdc_platform_register(struct device *dev);
+void atmel_pcm_pdc_platform_unregister(struct device *dev);
+#else
+static inline int atmel_pcm_pdc_platform_register(struct device *dev)
+{
+       return 0;
+}
+static inline void atmel_pcm_pdc_platform_unregister(struct device *dev)
+{
+}
+#endif
 
 #endif /* _ATMEL_PCM_H */
index 7932c052b736f2d13ccd0bf309fc48ef5464d26d..170561407f611dfabe5ae2668f5f885508ffa050 100644 (file)
@@ -729,7 +729,7 @@ static int asoc_ssc_init(struct device *dev)
                goto err;
        }
 
-       ret = atmel_pcm_platform_register(dev);
+       ret = atmel_pcm_pdc_platform_register(dev);
        if (ret) {
                dev_err(dev, "Could not register PCM: %d\n", ret);
                goto err_unregister_dai;
@@ -745,7 +745,7 @@ err:
 
 static void asoc_ssc_exit(struct device *dev)
 {
-       atmel_pcm_platform_unregister(dev);
+       atmel_pcm_pdc_platform_unregister(dev);
        snd_soc_unregister_dai(dev);
 }