1 files changed, 297 insertions, 0 deletions

diff --git a/sound/soc/pxa/mmp-pcm.c b/sound/soc/pxa/mmp-pcm.c
new file mode 100644
index 000000000000..73ac5463c9e4
--- /dev/null
+++ b/sound/soc/pxa/mmp-pcm.c
@@ -0,0 +1,297 @@
+/*
+ * linux/sound/soc/pxa/mmp-pcm.c
+ *
+ * Copyright (C) 2011 Marvell International Ltd.
+ *
+ * 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.
+ *
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/platform_data/mmp_audio.h>
+#include <sound/pxa2xx-lib.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <mach/sram.h>
+#include <sound/dmaengine_pcm.h>
+
+struct mmp_dma_data {
+        int ssp_id;
+        struct resource *dma_res;
+};
+
+#define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |     \
+                SNDRV_PCM_INFO_MMAP_VALID |     \
+                SNDRV_PCM_INFO_INTERLEAVED |    \
+                SNDRV_PCM_INFO_PAUSE |          \
+                SNDRV_PCM_INFO_RESUME)
+
+#define MMP_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+                         SNDRV_PCM_FMTBIT_S24_LE | \
+                         SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_pcm_hardware mmp_pcm_hardware[] = {
+        {
+                .info                   = MMP_PCM_INFO,
+                .formats                = MMP_PCM_FORMATS,
+                .period_bytes_min       = 1024,
+                .period_bytes_max       = 2048,
+                .periods_min            = 2,
+                .periods_max            = 32,
+                .buffer_bytes_max       = 4096,
+                .fifo_size              = 32,
+        },
+        {
+                .info                   = MMP_PCM_INFO,
+                .formats                = MMP_PCM_FORMATS,
+                .period_bytes_min       = 1024,
+                .period_bytes_max       = 2048,
+                .periods_min            = 2,
+                .periods_max            = 32,
+                .buffer_bytes_max       = 4096,
+                .fifo_size              = 32,
+        },
+};
+
+static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
+                              struct snd_pcm_hw_params *params)
+{
+        struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct pxa2xx_pcm_dma_params *dma_params;
+        struct dma_slave_config slave_config;
+        int ret;
+
+        dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+        if (!dma_params)
+                return 0;
+
+        ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
+        if (ret)
+                return ret;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                slave_config.dst_addr     = dma_params->dev_addr;
+                slave_config.dst_maxburst = 4;
+        } else {
+                slave_config.src_addr     = dma_params->dev_addr;
+                slave_config.src_maxburst = 4;
+        }
+
+        ret = dmaengine_slave_config(chan, &slave_config);
+        if (ret)
+                return ret;
+
+        snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+        return 0;
+}
+
+static bool filter(struct dma_chan *chan, void *param)
+{
+        struct mmp_dma_data *dma_data = param;
+        bool found = false;
+        char *devname;
+
+        devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
+                dma_data->ssp_id);
+        if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
+                (chan->chan_id == dma_data->dma_res->start)) {
+                found = true;
+        }
+
+        kfree(devname);
+        return found;
+}
+
+static int mmp_pcm_open(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct platform_device *pdev = to_platform_device(rtd->platform->dev);
+        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+        struct mmp_dma_data *dma_data;
+        struct resource *r;
+        int ret;
+
+        r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
+        if (!r)
+                return -EBUSY;
+
+        snd_soc_set_runtime_hwparams(substream,
+                                &mmp_pcm_hardware[substream->stream]);
+        dma_data = devm_kzalloc(&pdev->dev,
+                        sizeof(struct mmp_dma_data), GFP_KERNEL);
+        if (dma_data == NULL)
+                return -ENOMEM;
+
+        dma_data->dma_res = r;
+        dma_data->ssp_id = cpu_dai->id;
+
+        ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
+        if (ret) {
+                devm_kfree(&pdev->dev, dma_data);
+                return ret;
+        }
+
+        snd_dmaengine_pcm_set_data(substream, dma_data);
+        return 0;
+}
+
+static int mmp_pcm_close(struct snd_pcm_substream *substream)
+{
+        struct mmp_dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct platform_device *pdev = to_platform_device(rtd->platform->dev);
+
+        snd_dmaengine_pcm_close(substream);
+        devm_kfree(&pdev->dev, dma_data);
+        return 0;
+}
+
+static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
+                         struct vm_area_struct *vma)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        unsigned long off = vma->vm_pgoff;
+
+        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+        return remap_pfn_range(vma, vma->vm_start,
+                __phys_to_pfn(runtime->dma_addr) + off,
+                vma->vm_end - vma->vm_start, vma->vm_page_prot);
+}
+
+struct snd_pcm_ops mmp_pcm_ops = {
+        .open           = mmp_pcm_open,
+        .close          = mmp_pcm_close,
+        .ioctl          = snd_pcm_lib_ioctl,
+        .hw_params      = mmp_pcm_hw_params,
+        .trigger        = snd_dmaengine_pcm_trigger,
+        .pointer        = snd_dmaengine_pcm_pointer,
+        .mmap           = mmp_pcm_mmap,
+};
+
+static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
+{
+        struct snd_pcm_substream *substream;
+        struct snd_dma_buffer *buf;
+        int stream;
+        struct gen_pool *gpool;
+
+        gpool = sram_get_gpool("asram");
+        if (!gpool)
+                return;
+
+        for (stream = 0; stream < 2; stream++) {
+                size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
+
+                substream = pcm->streams[stream].substream;
+                if (!substream)
+                        continue;
+
+                buf = &substream->dma_buffer;
+                if (!buf->area)
+                        continue;
+                gen_pool_free(gpool, (unsigned long)buf->area, size);
+                buf->area = NULL;
+        }
+
+        return;
+}
+
+static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
+                                                                int stream)
+{
+        struct snd_dma_buffer *buf = &substream->dma_buffer;
+        size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
+        struct gen_pool *gpool;
+
+        buf->dev.type = SNDRV_DMA_TYPE_DEV;
+        buf->dev.dev = substream->pcm->card->dev;
+        buf->private_data = NULL;
+
+        gpool = sram_get_gpool("asram");
+        if (!gpool)
+                return -ENOMEM;
+
+        buf->area = (unsigned char *)gen_pool_alloc(gpool, size);
+        if (!buf->area)
+                return -ENOMEM;
+        buf->addr = gen_pool_virt_to_phys(gpool, (unsigned long)buf->area);
+        buf->bytes = size;
+        return 0;
+}
+
+int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+        struct snd_pcm_substream *substream;
+        struct snd_pcm *pcm = rtd->pcm;
+        int ret = 0, stream;
+
+        for (stream = 0; stream < 2; stream++) {
+                substream = pcm->streams[stream].substream;
+
+                ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
+                if (ret)
+                        goto err;
+        }
+
+        return 0;
+
+err:
+        mmp_pcm_free_dma_buffers(pcm);
+        return ret;
+}
+
+struct snd_soc_platform_driver mmp_soc_platform = {
+        .ops            = &mmp_pcm_ops,
+        .pcm_new        = mmp_pcm_new,
+        .pcm_free       = mmp_pcm_free_dma_buffers,
+};
+
+static __devinit int mmp_pcm_probe(struct platform_device *pdev)
+{
+        struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
+
+        if (pdata) {
+                mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
+                                                pdata->buffer_max_playback;
+                mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
+                                                pdata->period_max_playback;
+                mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
+                                                pdata->buffer_max_capture;
+                mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
+                                                pdata->period_max_capture;
+        }
+        return snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
+}
+
+static int __devexit mmp_pcm_remove(struct platform_device *pdev)
+{
+        snd_soc_unregister_platform(&pdev->dev);
+        return 0;
+}
+
+static struct platform_driver mmp_pcm_driver = {
+        .driver = {
+                .name = "mmp-pcm-audio",
+                .owner = THIS_MODULE,
+        },
+
+        .probe = mmp_pcm_probe,
+        .remove = __devexit_p(mmp_pcm_remove),
+};
+
+module_platform_driver(mmp_pcm_driver);
+
+MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
+MODULE_DESCRIPTION("MMP Soc Audio DMA module");
+MODULE_LICENSE("GPL");