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authorapatard@mandriva.com <apatard@mandriva.com>2010-05-31 15:49:14 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2010-05-31 16:16:37 +0400
commitf9b95980f87f021f8c69646738929189838ad035 (patch)
tree99ea04355647ccf423786804ddb56131d618c448 /sound/soc/kirkwood/kirkwood-dma.c
parent492e2bf141478e2c1ce3abfda381f73d1f2108f5 (diff)
downloadlinux-f9b95980f87f021f8c69646738929189838ad035.tar.xz
ASoC: kirkwood: Add i2s support
This patch enables support for the i2s controller available on kirkwood platforms Signed-off-by: Arnaud Patard <apatard@mandriva.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/kirkwood/kirkwood-dma.c')
-rw-r--r--sound/soc/kirkwood/kirkwood-dma.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/sound/soc/kirkwood/kirkwood-dma.c b/sound/soc/kirkwood/kirkwood-dma.c
new file mode 100644
index 000000000000..a30205be3e2b
--- /dev/null
+++ b/sound/soc/kirkwood/kirkwood-dma.c
@@ -0,0 +1,383 @@
+/*
+ * kirkwood-dma.c
+ *
+ * (c) 2010 Arnaud Patard <apatard@mandriva.com>
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/mbus.h>
+#include <sound/soc.h>
+#include "kirkwood-dma.h"
+#include "kirkwood.h"
+
+#define KIRKWOOD_RATES \
+ (SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
+#define KIRKWOOD_FORMATS \
+ (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+struct kirkwood_dma_priv {
+ struct snd_pcm_substream *play_stream;
+ struct snd_pcm_substream *rec_stream;
+ struct kirkwood_dma_data *data;
+};
+
+static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
+ .info = (SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_PAUSE),
+ .formats = KIRKWOOD_FORMATS,
+ .rates = KIRKWOOD_RATES,
+ .rate_min = 44100,
+ .rate_max = 96000,
+ .channels_min = 1,
+ .channels_max = 2,
+ .buffer_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
+ .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
+ .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
+ .periods_min = KIRKWOOD_SND_MIN_PERIODS,
+ .periods_max = KIRKWOOD_SND_MAX_PERIODS,
+ .fifo_size = 0,
+};
+
+static u64 kirkwood_dma_dmamask = 0xFFFFFFFFUL;
+
+static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
+{
+ struct kirkwood_dma_priv *prdata = dev_id;
+ struct kirkwood_dma_data *priv = prdata->data;
+ unsigned long mask, status, cause;
+
+ mask = readl(priv->io + KIRKWOOD_INT_MASK);
+ status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
+
+ cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
+ if (unlikely(cause)) {
+ printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
+ __func__, cause);
+ writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
+ return IRQ_HANDLED;
+ }
+
+ /* we've enabled only bytes interrupts ... */
+ if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
+ KIRKWOOD_INT_CAUSE_REC_BYTES)) {
+ printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
+ __func__, status);
+ return IRQ_NONE;
+ }
+
+ /* ack int */
+ writel(status, priv->io + KIRKWOOD_INT_CAUSE);
+
+ if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
+ snd_pcm_period_elapsed(prdata->play_stream);
+
+ if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
+ snd_pcm_period_elapsed(prdata->rec_stream);
+
+ return IRQ_HANDLED;
+}
+
+static void kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
+ unsigned long dma,
+ struct mbus_dram_target_info *dram)
+{
+ int i;
+
+ /* First disable and clear windows */
+ writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
+ writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
+
+ /* try to find matching cs for current dma address */
+ for (i = 0; i < dram->num_cs; i++) {
+ struct mbus_dram_window *cs = dram->cs + i;
+ if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
+ writel(cs->base & 0xffff0000,
+ base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
+ writel(((cs->size - 1) & 0xffff0000) |
+ (cs->mbus_attr << 8) |
+ (dram->mbus_dram_target_id << 4) | 1,
+ base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
+ }
+ }
+}
+
+static int kirkwood_dma_open(struct snd_pcm_substream *substream)
+{
+ int err;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
+ struct kirkwood_dma_data *priv;
+ struct kirkwood_dma_priv *prdata = cpu_dai->private_data;
+ unsigned long addr;
+
+ priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
+ snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
+
+ /* Ensure that all constraints linked to dma burst are fullfilled */
+ err = snd_pcm_hw_constraint_minmax(runtime,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
+ priv->burst * 2,
+ KIRKWOOD_AUDIO_BUF_MAX-1);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
+ priv->burst);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_step(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
+ priv->burst);
+ if (err < 0)
+ return err;
+
+ if (soc_runtime->dai->cpu_dai->private_data == NULL) {
+ prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
+ if (prdata == NULL)
+ return -ENOMEM;
+
+ prdata->data = priv;
+
+ err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
+ "kirkwood-i2s", prdata);
+ if (err) {
+ kfree(prdata);
+ return -EBUSY;
+ }
+
+ soc_runtime->dai->cpu_dai->private_data = prdata;
+
+ /*
+ * Enable Error interrupts. We're only ack'ing them but
+ * it's usefull for diagnostics
+ */
+ writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
+ }
+
+ addr = virt_to_phys(substream->dma_buffer.area);
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ prdata->play_stream = substream;
+ kirkwood_dma_conf_mbus_windows(priv->io,
+ KIRKWOOD_PLAYBACK_WIN, addr, priv->dram);
+ } else {
+ prdata->rec_stream = substream;
+ kirkwood_dma_conf_mbus_windows(priv->io,
+ KIRKWOOD_RECORD_WIN, addr, priv->dram);
+ }
+
+ return 0;
+}
+
+static int kirkwood_dma_close(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
+ struct kirkwood_dma_priv *prdata = cpu_dai->private_data;
+ struct kirkwood_dma_data *priv;
+
+ priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
+
+ if (!prdata || !priv)
+ return 0;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ prdata->play_stream = NULL;
+ else
+ prdata->rec_stream = NULL;
+
+ if (!prdata->play_stream && !prdata->rec_stream) {
+ writel(0, priv->io + KIRKWOOD_ERR_MASK);
+ free_irq(priv->irq, prdata);
+ kfree(prdata);
+ soc_runtime->dai->cpu_dai->private_data = NULL;
+ }
+
+ return 0;
+}
+
+static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+ runtime->dma_bytes = params_buffer_bytes(params);
+
+ return 0;
+}
+
+static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
+{
+ snd_pcm_set_runtime_buffer(substream, NULL);
+ return 0;
+}
+
+static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
+ struct kirkwood_dma_data *priv;
+ unsigned long size, count;
+
+ priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
+
+ /* compute buffer size in term of "words" as requested in specs */
+ size = frames_to_bytes(runtime, runtime->buffer_size);
+ size = (size>>2)-1;
+ count = snd_pcm_lib_period_bytes(substream);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
+ writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
+ writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
+ } else {
+ writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
+ writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
+ writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
+ }
+
+
+ return 0;
+}
+
+static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
+ *substream)
+{
+ struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+ struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
+ struct kirkwood_dma_data *priv;
+ snd_pcm_uframes_t count;
+
+ priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ count = bytes_to_frames(substream->runtime,
+ readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
+ else
+ count = bytes_to_frames(substream->runtime,
+ readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
+
+ return count;
+}
+
+struct snd_pcm_ops kirkwood_dma_ops = {
+ .open = kirkwood_dma_open,
+ .close = kirkwood_dma_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = kirkwood_dma_hw_params,
+ .hw_free = kirkwood_dma_hw_free,
+ .prepare = kirkwood_dma_prepare,
+ .pointer = kirkwood_dma_pointer,
+};
+
+static int kirkwood_dma_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 = kirkwood_dma_snd_hw.buffer_bytes_max;
+
+ buf->dev.type = SNDRV_DMA_TYPE_DEV;
+ buf->dev.dev = pcm->card->dev;
+ buf->area = dma_alloc_coherent(pcm->card->dev, size,
+ &buf->addr, GFP_KERNEL);
+ if (!buf->area)
+ return -ENOMEM;
+ buf->bytes = size;
+ buf->private_data = NULL;
+
+ return 0;
+}
+
+static int kirkwood_dma_new(struct snd_card *card,
+ struct snd_soc_dai *dai, struct snd_pcm *pcm)
+{
+ int ret;
+
+ if (!card->dev->dma_mask)
+ card->dev->dma_mask = &kirkwood_dma_dmamask;
+ if (!card->dev->coherent_dma_mask)
+ card->dev->coherent_dma_mask = 0xffffffff;
+
+ if (dai->playback.channels_min) {
+ ret = kirkwood_dma_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_PLAYBACK);
+ if (ret)
+ return ret;
+ }
+
+ if (dai->capture.channels_min) {
+ ret = kirkwood_dma_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_CAPTURE);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void kirkwood_dma_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_coherent(pcm->card->dev, buf->bytes,
+ buf->area, buf->addr);
+ buf->area = NULL;
+ }
+}
+
+struct snd_soc_platform kirkwood_soc_platform = {
+ .name = "kirkwood-dma",
+ .pcm_ops = &kirkwood_dma_ops,
+ .pcm_new = kirkwood_dma_new,
+ .pcm_free = kirkwood_dma_free_dma_buffers,
+};
+EXPORT_SYMBOL_GPL(kirkwood_soc_platform);
+
+static int __init kirkwood_soc_platform_init(void)
+{
+ return snd_soc_register_platform(&kirkwood_soc_platform);
+}
+module_init(kirkwood_soc_platform_init);
+
+static void __exit kirkwood_soc_platform_exit(void)
+{
+ snd_soc_unregister_platform(&kirkwood_soc_platform);
+}
+module_exit(kirkwood_soc_platform_exit);
+
+MODULE_AUTHOR("Arnaud Patard <apatard@mandriva.com>");
+MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
+MODULE_LICENSE("GPL");
+