1 files changed, 373 insertions, 0 deletions

diff --git a/sound/soc/jz4740/jz4740-pcm.c b/sound/soc/jz4740/jz4740-pcm.c
new file mode 100644
index 000000000000..ee68d850c8dd
--- /dev/null
+++ b/sound/soc/jz4740/jz4740-pcm.c
@@ -0,0 +1,373 @@
+/*
+ *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
+ *
+ *  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.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <linux/dma-mapping.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/mach-jz4740/dma.h>
+#include "jz4740-pcm.h"
+
+struct jz4740_runtime_data {
+        unsigned long dma_period;
+        dma_addr_t dma_start;
+        dma_addr_t dma_pos;
+        dma_addr_t dma_end;
+
+        struct jz4740_dma_chan *dma;
+
+        dma_addr_t fifo_addr;
+};
+
+/* identify hardware playback capabilities */
+static const struct snd_pcm_hardware jz4740_pcm_hardware = {
+        .info = SNDRV_PCM_INFO_MMAP |
+                SNDRV_PCM_INFO_MMAP_VALID |
+                SNDRV_PCM_INFO_INTERLEAVED |
+                SNDRV_PCM_INFO_BLOCK_TRANSFER,
+        .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8,
+
+        .rates                  = SNDRV_PCM_RATE_8000_48000,
+        .channels_min           = 1,
+        .channels_max           = 2,
+        .period_bytes_min       = 16,
+        .period_bytes_max       = 2 * PAGE_SIZE,
+        .periods_min            = 2,
+        .periods_max            = 128,
+        .buffer_bytes_max       = 128 * 2 * PAGE_SIZE,
+        .fifo_size              = 32,
+};
+
+static void jz4740_pcm_start_transfer(struct jz4740_runtime_data *prtd,
+        struct snd_pcm_substream *substream)
+{
+        unsigned long count;
+
+        if (prtd->dma_pos == prtd->dma_end)
+                prtd->dma_pos = prtd->dma_start;
+
+        if (prtd->dma_pos + prtd->dma_period > prtd->dma_end)
+                count = prtd->dma_end - prtd->dma_pos;
+        else
+                count = prtd->dma_period;
+
+        jz4740_dma_disable(prtd->dma);
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                jz4740_dma_set_src_addr(prtd->dma, prtd->dma_pos);
+                jz4740_dma_set_dst_addr(prtd->dma, prtd->fifo_addr);
+        } else {
+                jz4740_dma_set_src_addr(prtd->dma, prtd->fifo_addr);
+                jz4740_dma_set_dst_addr(prtd->dma, prtd->dma_pos);
+        }
+
+        jz4740_dma_set_transfer_count(prtd->dma, count);
+
+        prtd->dma_pos += count;
+
+        jz4740_dma_enable(prtd->dma);
+}
+
+static void jz4740_pcm_dma_transfer_done(struct jz4740_dma_chan *dma, int err,
+        void *dev_id)
+{
+        struct snd_pcm_substream *substream = dev_id;
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct jz4740_runtime_data *prtd = runtime->private_data;
+
+        snd_pcm_period_elapsed(substream);
+
+        jz4740_pcm_start_transfer(prtd, substream);
+}
+
+static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream,
+        struct snd_pcm_hw_params *params)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct jz4740_runtime_data *prtd = runtime->private_data;
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct jz4740_pcm_config *config;
+
+        config = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
+
+        if (!config)
+                return 0;
+
+        if (!prtd->dma) {
+                if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+                        prtd->dma = jz4740_dma_request(substream, "PCM Capture");
+                else
+                        prtd->dma = jz4740_dma_request(substream, "PCM Playback");
+        }
+
+        if (!prtd->dma)
+                return -EBUSY;
+
+        jz4740_dma_configure(prtd->dma, &config->dma_config);
+        prtd->fifo_addr = config->fifo_addr;
+
+        jz4740_dma_set_complete_cb(prtd->dma, jz4740_pcm_dma_transfer_done);
+
+        snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+        runtime->dma_bytes = params_buffer_bytes(params);
+
+        prtd->dma_period = params_period_bytes(params);
+        prtd->dma_start = runtime->dma_addr;
+        prtd->dma_pos = prtd->dma_start;
+        prtd->dma_end = prtd->dma_start + runtime->dma_bytes;
+
+        return 0;
+}
+
+static int jz4740_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+        struct jz4740_runtime_data *prtd = substream->runtime->private_data;
+
+        snd_pcm_set_runtime_buffer(substream, NULL);
+        if (prtd->dma) {
+                jz4740_dma_free(prtd->dma);
+                prtd->dma = NULL;
+        }
+
+        return 0;
+}
+
+static int jz4740_pcm_prepare(struct snd_pcm_substream *substream)
+{
+        struct jz4740_runtime_data *prtd = substream->runtime->private_data;
+
+        if (!prtd->dma)
+                return -EBUSY;
+
+        prtd->dma_pos = prtd->dma_start;
+
+        return 0;
+}
+
+static int jz4740_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct jz4740_runtime_data *prtd = runtime->private_data;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                jz4740_pcm_start_transfer(prtd, substream);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                jz4740_dma_disable(prtd->dma);
+                break;
+        default:
+                break;
+        }
+
+        return 0;
+}
+
+static snd_pcm_uframes_t jz4740_pcm_pointer(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct jz4740_runtime_data *prtd = runtime->private_data;
+        unsigned long byte_offset;
+        snd_pcm_uframes_t offset;
+        struct jz4740_dma_chan *dma = prtd->dma;
+
+        /* prtd->dma_pos points to the end of the current transfer. So by
+         * subtracting prdt->dma_start we get the offset to the end of the
+         * current period in bytes. By subtracting the residue of the transfer
+         * we get the current offset in bytes. */
+        byte_offset = prtd->dma_pos - prtd->dma_start;
+        byte_offset -= jz4740_dma_get_residue(dma);
+
+        offset = bytes_to_frames(runtime, byte_offset);
+        if (offset >= runtime->buffer_size)
+                offset = 0;
+
+        return offset;
+}
+
+static int jz4740_pcm_open(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct jz4740_runtime_data *prtd;
+
+        prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
+        if (prtd == NULL)
+                return -ENOMEM;
+
+        snd_soc_set_runtime_hwparams(substream, &jz4740_pcm_hardware);
+
+        runtime->private_data = prtd;
+
+        return 0;
+}
+
+static int jz4740_pcm_close(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct jz4740_runtime_data *prtd = runtime->private_data;
+
+        kfree(prtd);
+
+        return 0;
+}
+
+static int jz4740_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);
+}
+
+static struct snd_pcm_ops jz4740_pcm_ops = {
+        .open           = jz4740_pcm_open,
+        .close          = jz4740_pcm_close,
+        .ioctl          = snd_pcm_lib_ioctl,
+        .hw_params      = jz4740_pcm_hw_params,
+        .hw_free        = jz4740_pcm_hw_free,
+        .prepare        = jz4740_pcm_prepare,
+        .trigger        = jz4740_pcm_trigger,
+        .pointer        = jz4740_pcm_pointer,
+        .mmap           = jz4740_pcm_mmap,
+};
+
+static int jz4740_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 = jz4740_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_noncoherent(pcm->card->dev, size,
+                                          &buf->addr, GFP_KERNEL);
+        if (!buf->area)
+                return -ENOMEM;
+
+        buf->bytes = size;
+
+        return 0;
+}
+
+static void jz4740_pcm_free(struct snd_pcm *pcm)
+{
+        struct snd_pcm_substream *substream;
+        struct snd_dma_buffer *buf;
+        int stream;
+
+        for (stream = 0; stream < SNDRV_PCM_STREAM_LAST; ++stream) {
+                substream = pcm->streams[stream].substream;
+                if (!substream)
+                        continue;
+
+                buf = &substream->dma_buffer;
+                if (!buf->area)
+                        continue;
+
+                dma_free_noncoherent(pcm->card->dev, buf->bytes, buf->area,
+                                buf->addr);
+                buf->area = NULL;
+        }
+}
+
+static u64 jz4740_pcm_dmamask = DMA_BIT_MASK(32);
+
+int jz4740_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
+        struct snd_pcm *pcm)
+{
+        int ret = 0;
+
+        if (!card->dev->dma_mask)
+                card->dev->dma_mask = &jz4740_pcm_dmamask;
+
+        if (!card->dev->coherent_dma_mask)
+                card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+        if (dai->playback.channels_min) {
+                ret = jz4740_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_PLAYBACK);
+                if (ret)
+                        goto err;
+        }
+
+        if (dai->capture.channels_min) {
+                ret = jz4740_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_CAPTURE);
+                if (ret)
+                        goto err;
+        }
+
+err:
+        return ret;
+}
+
+struct snd_soc_platform jz4740_soc_platform = {
+                .name           = "jz4740-pcm",
+                .pcm_ops        = &jz4740_pcm_ops,
+                .pcm_new        = jz4740_pcm_new,
+                .pcm_free       = jz4740_pcm_free,
+};
+EXPORT_SYMBOL_GPL(jz4740_soc_platform);
+
+static int __devinit jz4740_pcm_probe(struct platform_device *pdev)
+{
+        return snd_soc_register_platform(&jz4740_soc_platform);
+}
+
+static int __devexit jz4740_pcm_remove(struct platform_device *pdev)
+{
+        snd_soc_unregister_platform(&jz4740_soc_platform);
+        return 0;
+}
+
+static struct platform_driver jz4740_pcm_driver = {
+        .probe = jz4740_pcm_probe,
+        .remove = __devexit_p(jz4740_pcm_remove),
+        .driver = {
+                .name = "jz4740-pcm",
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init jz4740_soc_platform_init(void)
+{
+        return platform_driver_register(&jz4740_pcm_driver);
+}
+module_init(jz4740_soc_platform_init);
+
+static void __exit jz4740_soc_platform_exit(void)
+{
+        return platform_driver_unregister(&jz4740_pcm_driver);
+}
+module_exit(jz4740_soc_platform_exit);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("Ingenic SoC JZ4740 PCM driver");
+MODULE_LICENSE("GPL");