--- /dev/null
+/*
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.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 int 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 = 32,
+ .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, int stream)
+{
+ unsigned int count;
+
+ 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 (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);
+
+ jz4740_dma_enable(prtd->dma);
+
+ prtd->dma_pos += prtd->dma_period;
+ if (prtd->dma_pos >= prtd->dma_end)
+ prtd->dma_pos = prtd->dma_start;
+}
+
+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->stream);
+}
+
+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 = rtd->dai->cpu_dai->dma_data;
+ if (!prtd->dma) {
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ prtd->dma = jz4740_dma_request(substream, "PCM Playback");
+ else
+ prtd->dma = jz4740_dma_request(substream, "PCM Capture");
+ }
+
+ 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;
+ int ret = 0;
+
+ if (!prtd->dma)
+ return 0;
+
+ prtd->dma_pos = prtd->dma_start;
+
+ return ret;
+}
+
+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;
+
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ jz4740_pcm_start_transfer(prtd, substream->stream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ jz4740_dma_disable(prtd->dma);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+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 count, pos;
+ snd_pcm_uframes_t offset;
+ struct jz4740_dma_chan *dma = prtd->dma;
+
+ count = jz4740_dma_get_residue(dma);
+ if (prtd->dma_pos == prtd->dma_start)
+ pos = prtd->dma_end - prtd->dma_start - count;
+ else
+ pos = prtd->dma_pos - prtd->dma_start - count;
+
+ offset = bytes_to_frames(runtime, pos);
+ 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;
+
+ snd_soc_set_runtime_hwparams(substream, &jz4740_pcm_hardware);
+ prtd = kzalloc(sizeof(struct jz4740_runtime_data), GFP_KERNEL);
+
+ if (prtd == NULL)
+ return -ENOMEM;
+
+ 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 < 2; 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 __init jz4740_soc_platform_init(void)
+{
+ return snd_soc_register_platform(&jz4740_soc_platform);
+}
+module_init(jz4740_soc_platform_init);
+
+static void __exit jz4740_soc_platform_exit(void)
+{
+ snd_soc_unregister_platform(&jz4740_soc_platform);
+}
+module_exit(jz4740_soc_platform_exit);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("Ingenic SoC JZ4740 PCM driver");
+MODULE_LICENSE("GPL");
projects / openwrt-10.03 / .git / blobdiff