This patch by Ben Dooks from Simtec Electronics adds ASoC audio DMA
support for the Samsung S3C24xx CPU.
Signed-off-by: Ben Dooks <ben@xxxxxxxxxxxx>
Signed-off-by: Graeme Gregory <gg@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Liam Girdwood <lg@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
diff -r 0f9c7c3b7657 soc/s3c24xx/s3c24xx-pcm.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/soc/s3c24xx/s3c24xx-pcm.h Fri Feb 02 17:50:25 2007 +0000
@@ -0,0 +1,25 @@
+/*
+ * linux/sound/arm/s3c24xx-pcm.h -- ALSA PCM interface for the Samsung S3C24xx CPU
+ */
+
+#ifndef _S3C24XX_PCM_H
+#define _S3C24XX_PCM_H
+
+#define ST_RUNNING (1<<0)
+#define ST_OPENED (1<<1)
+
+typedef struct {
+ struct s3c2410_dma_client *client; /* stream identifier */
+ int channel; /* Channel ID */
+ dma_addr_t dma_addr;
+} s3c24xx_pcm_dma_params_t;
+
+#define S3C24XX_DAI_I2S 0
+
+extern struct snd_soc_cpu_dai s3c24xx_i2s_dai;
+
+/* platform data */
+extern struct snd_soc_platform s3c24xx_soc_platform;
+extern struct snd_ac97_bus_ops s3c24xx_ac97_ops;
+
+#endif
diff -r 0f9c7c3b7657 soc/s3c24xx/s3c24xx-pcm.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/soc/s3c24xx/s3c24xx-pcm.c Wed Jan 31 16:43:17 2007 +0000
@@ -0,0 +1,484 @@
+/*
+ * s3c24xx-pcm.c -- ALSA Soc Audio Layer
+ *
+ * (c) 2006 Wolfson Microelectronics PLC.
+ * Graeme Gregory graeme.gregory@xxxxxxxxxxxxxxxx or linux@xxxxxxxxxxxxxxxx
+ *
+ * (c) 2004-2005 Simtec Electronics
+ * http://armlinux.simtec.co.uk/
+ * Ben Dooks <ben@xxxxxxxxxxxx>
+ *
+ * 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.
+ *
+ * Revision history
+ * 11th Dec 2006 Merged with Simtec driver
+ * 10th Nov 2006 Initial version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include <asm/arch/dma.h>
+#include <asm/arch/audio.h>
+
+#include "s3c24xx-pcm.h"
+
+#define S3C24XX_PCM_DEBUG 0
+#if S3C24XX_PCM_DEBUG
+#define DBG(x...) printk(KERN_DEBUG x)
+#else
+#define DBG(x...)
+#endif
+
+static const struct snd_pcm_hardware s3c24xx_pcm_hardware = {
+ .info = ( SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ 0),
+ .formats = ( SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_U16_LE |
+ SNDRV_PCM_FMTBIT_U8 |
+ SNDRV_PCM_FMTBIT_S8 ),
+ .rates = SNDRV_PCM_RATE_44100,
+ .rate_min = 8000,
+ .rate_max = 48000,
+ .channels_min = 2,
+ .channels_max = 2,
+ .buffer_bytes_max = 128*1024,
+ .period_bytes_min = PAGE_SIZE,
+ .period_bytes_max = PAGE_SIZE*2,
+ .periods_min = 2,
+ .periods_max = 128,
+ .fifo_size = 32,
+};
+
+struct s3c24xx_runtime_data {
+ spinlock_t lock;
+ int state;
+ unsigned int dma_loaded;
+ unsigned int dma_limit;
+ unsigned int dma_period;
+ dma_addr_t dma_start;
+ dma_addr_t dma_pos;
+ dma_addr_t dma_end;
+ s3c24xx_pcm_dma_params_t *params;
+};
+
+/* s3c24xx_pcm_enqueue
+ *
+ * place a dma buffer onto the queue for the dma system
+ * to handle.
+*/
+
+static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream)
+{
+ struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
+ dma_addr_t pos = prtd->dma_pos;
+ int ret;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ while ( prtd->dma_loaded < prtd->dma_limit) {
+ unsigned long len = prtd->dma_period;
+
+ DBG("dma_loaded: %d\n",prtd->dma_loaded);
+
+ if ((pos + len) > prtd->dma_end) {
+ len = prtd->dma_end - pos;
+ DBG(KERN_DEBUG "%s: corrected dma len %ld\n",
+ __FUNCTION__, len);
+ }
+
+ ret = s3c2410_dma_enqueue(prtd->params->channel, substream, pos, len);
+
+ if (ret == 0) {
+ prtd->dma_loaded++;
+ pos += prtd->dma_period;
+ if (pos >= prtd->dma_end)
+ pos = prtd->dma_start;
+ } else
+ break;
+ }
+
+ prtd->dma_pos = pos;
+}
+
+void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
+ void *dev_id, int size,
+ enum s3c2410_dma_buffresult result)
+{
+ struct snd_pcm_substream *substream = dev_id;
+ struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
+ return;
+
+ if (substream)
+ snd_pcm_period_elapsed(substream);
+
+ spin_lock(&prtd->lock);
+ if (prtd->state & ST_RUNNING) {
+ prtd->dma_loaded--;
+ s3c24xx_pcm_enqueue(substream);
+ }
+
+ spin_unlock(&prtd->lock);
+}
+
+static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct s3c24xx_runtime_data *prtd = runtime->private_data;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ s3c24xx_pcm_dma_params_t *dma = rtd->dai->cpu_dai->dma_data;
+ unsigned long totbytes = params_buffer_bytes(params);
+ unsigned long flags;
+ int ret=0;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ /* prepare DMA */
+ prtd->params = dma;
+
+ DBG("params %p, client %p, channel %d\n", prtd->params,
+ prtd->params->client, prtd->params->channel);
+
+ ret = s3c2410_dma_request(prtd->params->channel,
+ prtd->params->client, NULL);
+
+ if (ret) {
+ DBG(KERN_ERR "failed to get dma channel\n");
+ return ret;
+ }
+
+ /* channel needs configuring for mem=>device, increment memory addr,
+ * sync to pclk, half-word transfers to the IIS-FIFO. */
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ s3c2410_dma_devconfig(prtd->params->channel,
+ S3C2410_DMASRC_MEM, S3C2410_DISRCC_INC |
+ S3C2410_DISRCC_APB, prtd->params->dma_addr);
+
+ s3c2410_dma_config(prtd->params->channel,
+ 2, S3C2410_DCON_SYNC_PCLK | S3C2410_DCON_HANDSHAKE);
+ } else {
+ s3c2410_dma_config(prtd->params->channel,
+ 2, S3C2410_DCON_HANDSHAKE | S3C2410_DCON_SYNC_PCLK);
+
+ s3c2410_dma_devconfig(prtd->params->channel,
+ S3C2410_DMASRC_HW, 0x3,
+ prtd->params->dma_addr);
+ }
+
+ s3c2410_dma_set_buffdone_fn(prtd->params->channel,
+ s3c24xx_audio_buffdone);
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+ runtime->dma_bytes = totbytes;
+
+ spin_lock_irqsave(&prtd->lock, flags);
+ prtd->dma_loaded = 0;
+ prtd->dma_limit = runtime->hw.periods_min;
+ 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 + totbytes;
+ spin_unlock_irqrestore(&prtd->lock, flags);
+
+ return 0;
+}
+
+static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ // TODO - do we need to ensure DMA flushed
+ snd_pcm_set_runtime_buffer(substream, NULL);
+
+ if(prtd->params) {
+ s3c2410_dma_free(prtd->params->channel, prtd->params->client);
+ prtd->params = NULL;
+ }
+
+}
+
+static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int ret = 0;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ /* flush the DMA channel */
+
+ s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
+ prtd->dma_loaded = 0;
+ prtd->dma_pos = prtd->dma_start;
+
+ /* enqueue dma buffers */
+ s3c24xx_pcm_enqueue(substream);
+
+ return ret;
+}
+
+static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
+ int ret = 0;
+ unsigned long flags;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ spin_lock_irqsave(&prtd->lock, flags);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ prtd->state |= ST_RUNNING;
+ s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
+ s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ prtd->state &= ~ST_RUNNING;
+ s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
+ break;
+
+ default:
+ ret = -EINVAL;
+ }
+
+ spin_unlock_irqrestore(&prtd->lock, flags);
+
+ return ret;
+}
+
+static snd_pcm_uframes_t s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct s3c24xx_runtime_data *prtd = runtime->private_data;
+ unsigned long flags;
+ unsigned long res;
+ dma_addr_t src, dst;
+ snd_pcm_uframes_t ret;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ spin_lock_irqsave(&prtd->lock, flags);
+ s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ res = dst - prtd->dma_start;
+ else
+ res = src - prtd->dma_start;
+
+ spin_unlock_irqrestore(&prtd->lock, flags);
+
+ DBG("Pointer %x %x\n",src,dst);
+
+ /* we seem to be getting the odd error from the pcm library due
+ * to out-of-bounds pointers. this is maybe due to the dma engine
+ * not having loaded the new values for the channel before being
+ * callled... (todo - fix )
+ */
+
+ if (res > (prtd->dma_end - prtd->dma_start))
+ // DBG("%s: %lx,%lx (%lx) from %lx,%lx\n", __FUNCTION__,
+ // (long)src, (long)dst, res,
+ // (long)prtd->dma_start, (long)prtd->dma_end);
+
+ if (res >= snd_pcm_lib_buffer_bytes(substream)) {
+ // DBG("%s: %lx,%lx (%lx) from %lx,%lx\n", __FUNCTION__,
+ // (long)src, (long)dst, res,
+ // (long)prtd->dma_start, (long)prtd->dma_end);
+
+ // if (res > snd_pcm_lib_buffer_bytes(substream))
+ // DBG("%s: res %lx >= %lx\n", __FUNCTION__,
+ // res, (long)snd_pcm_lib_buffer_bytes(substream));
+
+ if (res == snd_pcm_lib_buffer_bytes(substream))
+ res = 0;
+ }
+
+ ret = bytes_to_frames(substream->runtime, res);
+
+ return ret;
+
+}
+
+static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct s3c24xx_runtime_data *prtd;
+
+ int ret;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware);
+
+ if((prtd = kzalloc(sizeof(struct s3c24xx_runtime_data),
+ GFP_KERNEL)) == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ runtime->private_data = prtd;
+ return 0;
+
+out:
+ return ret;
+}
+
+static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct s3c24xx_runtime_data *prtd = runtime->private_data;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ if(prtd)
+ kfree(prtd);
+ else {
+ DBG("s3c24xx_pcm_close called with prtd == NULL\n");
+ }
+
+ return 0;
+}
+
+static int
+s3c24xx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+ runtime->dma_area,
+ runtime->dma_addr,
+ runtime->dma_bytes);
+}
+
+struct snd_pcm_ops s3c24xx_pcm_ops = {
+ .open = s3c24xx_pcm_open,
+ .close = s3c24xx_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = s3c24xx_pcm_hw_params,
+ .hw_free = s3c24xx_pcm_hw_free,
+ .prepare = s3c24xx_pcm_prepare,
+ .trigger = s3c24xx_pcm_trigger,
+ .pointer = s3c24xx_pcm_pointer,
+ .mmap = s3c24xx_pcm_mmap,
+};
+
+static int s3c24xx_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 = s3c24xx_pcm_hardware.buffer_bytes_max;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ 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;
+}
+
+static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
+{
+ struct snd_pcm_substream *substream;
+ struct snd_dma_buffer *buf;
+ int stream;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ 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;
+ }
+}
+
+static u64 s3c24xx_pcm_dmamask = 0xffffffff;
+
+int s3c24xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
+ struct snd_pcm *pcm)
+{
+ int ret = 0;
+
+ DBG("Entered %s\n", __FUNCTION__);
+
+ if (!card->dev->dma_mask)
+ card->dev->dma_mask = &s3c24xx_pcm_dmamask;
+ if (!card->dev->coherent_dma_mask)
+ card->dev->coherent_dma_mask = 0xffffffff;
+
+ if (dai->playback.channels_min) {
+ ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_PLAYBACK);
+ if (ret)
+ goto out;
+ }
+
+ if (dai->capture.channels_min) {
+ ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_CAPTURE);
+ if (ret)
+ goto out;
+ }
+ out:
+ return ret;
+}
+
+struct snd_soc_platform s3c24xx_soc_platform = {
+ .name = "s3c24xx-audio",
+ .pcm_ops = &s3c24xx_pcm_ops,
+ .pcm_new = s3c24xx_pcm_new,
+ .pcm_free = s3c24xx_pcm_free_dma_buffers,
+};
+
+EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
+
+MODULE_AUTHOR("Ben Dooks, <ben@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
+MODULE_LICENSE("GPL");
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