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authorDmitry Baryshkov <dbaryshkov@gmail.com>2008-09-10 05:01:20 +0400
committerJaroslav Kysela <perex@perex.cz>2008-09-23 08:18:10 +0200
commita6d77317678148c973bb0131cc5a3a772f756d23 (patch)
tree09cf4c825ce49eccef121d4ad133cfec20246248 /sound/arm/pxa2xx-pcm-lib.c
parent9d1cf39be6709761be3ce0a00e5c9ee5dc805ac5 (diff)
downloadlinux-2.6.38-lt-ux500-a6d77317678148c973bb0131cc5a3a772f756d23.tar.gz
ALSA: Separate common pxa2xx-pcm code
ASoC and non-ASoC drivers for PCM DMA on PXA share lots of common code. Move it to pxa2xx-lib. [Fixed some checkpatch warnings -- broonie] Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Diffstat (limited to 'sound/arm/pxa2xx-pcm-lib.c')
-rw-r--r--sound/arm/pxa2xx-pcm-lib.c278
1 files changed, 278 insertions, 0 deletions
diff --git a/sound/arm/pxa2xx-pcm-lib.c b/sound/arm/pxa2xx-pcm-lib.c
new file mode 100644
index 00000000000..1c93eb77cb9
--- /dev/null
+++ b/sound/arm/pxa2xx-pcm-lib.c
@@ -0,0 +1,278 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/pxa2xx-lib.h>
+
+#include <asm/dma.h>
+#include <mach/pxa-regs.h>
+
+#include "pxa2xx-pcm.h"
+
+static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
+ .info = SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_PAUSE |
+ SNDRV_PCM_INFO_RESUME,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S24_LE |
+ SNDRV_PCM_FMTBIT_S32_LE,
+ .period_bytes_min = 32,
+ .period_bytes_max = 8192 - 32,
+ .periods_min = 1,
+ .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
+ .buffer_bytes_max = 128 * 1024,
+ .fifo_size = 32,
+};
+
+int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct pxa2xx_runtime_data *rtd = runtime->private_data;
+ size_t totsize = params_buffer_bytes(params);
+ size_t period = params_period_bytes(params);
+ pxa_dma_desc *dma_desc;
+ dma_addr_t dma_buff_phys, next_desc_phys;
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+ runtime->dma_bytes = totsize;
+
+ dma_desc = rtd->dma_desc_array;
+ next_desc_phys = rtd->dma_desc_array_phys;
+ dma_buff_phys = runtime->dma_addr;
+ do {
+ next_desc_phys += sizeof(pxa_dma_desc);
+ dma_desc->ddadr = next_desc_phys;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ dma_desc->dsadr = dma_buff_phys;
+ dma_desc->dtadr = rtd->params->dev_addr;
+ } else {
+ dma_desc->dsadr = rtd->params->dev_addr;
+ dma_desc->dtadr = dma_buff_phys;
+ }
+ if (period > totsize)
+ period = totsize;
+ dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
+ dma_desc++;
+ dma_buff_phys += period;
+ } while (totsize -= period);
+ dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
+
+ return 0;
+}
+EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
+
+int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
+
+ if (rtd && rtd->params)
+ *rtd->params->drcmr = 0;
+
+ snd_pcm_set_runtime_buffer(substream, NULL);
+ return 0;
+}
+EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
+
+int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
+ DCSR(prtd->dma_ch) = DCSR_RUN;
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ DCSR(prtd->dma_ch) &= ~DCSR_RUN;
+ break;
+
+ case SNDRV_PCM_TRIGGER_RESUME:
+ DCSR(prtd->dma_ch) |= DCSR_RUN;
+ break;
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
+ DCSR(prtd->dma_ch) |= DCSR_RUN;
+ break;
+
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(pxa2xx_pcm_trigger);
+
+snd_pcm_uframes_t
+pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct pxa2xx_runtime_data *prtd = runtime->private_data;
+
+ dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
+ DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
+ snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
+
+ if (x == runtime->buffer_size)
+ x = 0;
+ return x;
+}
+EXPORT_SYMBOL(pxa2xx_pcm_pointer);
+
+int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
+
+ DCSR(prtd->dma_ch) &= ~DCSR_RUN;
+ DCSR(prtd->dma_ch) = 0;
+ DCMD(prtd->dma_ch) = 0;
+ *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
+
+ return 0;
+}
+EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
+
+void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
+{
+ struct snd_pcm_substream *substream = dev_id;
+ struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
+ int dcsr;
+
+ dcsr = DCSR(dma_ch);
+ DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
+
+ if (dcsr & DCSR_ENDINTR) {
+ snd_pcm_period_elapsed(substream);
+ } else {
+ printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
+ rtd->params->name, dma_ch, dcsr);
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+ }
+}
+EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
+
+int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct pxa2xx_runtime_data *rtd;
+ int ret;
+
+ runtime->hw = pxa2xx_pcm_hardware;
+
+ /*
+ * For mysterious reasons (and despite what the manual says)
+ * playback samples are lost if the DMA count is not a multiple
+ * of the DMA burst size. Let's add a rule to enforce that.
+ */
+ ret = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
+ if (ret)
+ goto out;
+
+ ret = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
+ if (ret)
+ goto out;
+
+ ret = snd_pcm_hw_constraint_integer(runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (ret < 0)
+ goto out;
+
+ ret = -ENOMEM;
+ rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
+ if (!rtd)
+ goto out;
+ rtd->dma_desc_array =
+ dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
+ &rtd->dma_desc_array_phys, GFP_KERNEL);
+ if (!rtd->dma_desc_array)
+ goto err1;
+
+ runtime->private_data = rtd;
+ return 0;
+
+ err1:
+ kfree(rtd);
+ out:
+ return ret;
+}
+EXPORT_SYMBOL(__pxa2xx_pcm_open);
+
+int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct pxa2xx_runtime_data *rtd = runtime->private_data;
+
+ dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
+ rtd->dma_desc_array, rtd->dma_desc_array_phys);
+ kfree(rtd);
+ return 0;
+}
+EXPORT_SYMBOL(__pxa2xx_pcm_close);
+
+int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
+ struct vm_area_struct *vma)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+ runtime->dma_area,
+ runtime->dma_addr,
+ runtime->dma_bytes);
+}
+EXPORT_SYMBOL(pxa2xx_pcm_mmap);
+
+int pxa2xx_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 = pxa2xx_pcm_hardware.buffer_bytes_max;
+ buf->dev.type = SNDRV_DMA_TYPE_DEV;
+ buf->dev.dev = pcm->card->dev;
+ buf->private_data = NULL;
+ buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+ &buf->addr, GFP_KERNEL);
+ if (!buf->area)
+ return -ENOMEM;
+ buf->bytes = size;
+ return 0;
+}
+EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
+
+void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
+{
+ struct snd_pcm_substream *substream;
+ struct snd_dma_buffer *buf;
+ int stream;
+
+ for (stream = 0; stream < 2; stream++) {
+ substream = pcm->streams[stream].substream;
+ if (!substream)
+ continue;
+ buf = &substream->dma_buffer;
+ if (!buf->area)
+ continue;
+ dma_free_writecombine(pcm->card->dev, buf->bytes,
+ buf->area, buf->addr);
+ buf->area = NULL;
+ }
+}
+EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
+
+MODULE_AUTHOR("Nicolas Pitre");
+MODULE_DESCRIPTION("Intel PXA2xx sound library");
+MODULE_LICENSE("GPL");