1 files changed, 262 insertions, 0 deletions
diff --git a/sound/soc/kirkwood/kirkwood-dma.c b/sound/soc/kirkwood/kirkwood-dma.c
new file mode 100644
index 000000000..640cebd29
--- /dev/null
+++ b/sound/soc/kirkwood/kirkwood-dma.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * kirkwood-dma.c
+ *
+ * (c) 2010 Arnaud Patard <apatard@mandriva.com>
+ * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
+ */
+
+#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.h"
+
+static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
+{
+	struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
+	return snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(soc_runtime, 0));
+}
+
+static const 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 |
+		SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
+	.buffer_bytes_max	= KIRKWOOD_SND_MAX_BUFFER_BYTES,
+	.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 irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
+{
+	struct kirkwood_dma_data *priv = dev_id;
+	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);
+	}
+
+	/* 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(priv->substream_play);
+
+	if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
+		snd_pcm_period_elapsed(priv->substream_rec);
+
+	return IRQ_HANDLED;
+}
+
+static void
+kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
+			       unsigned long dma,
+			       const 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++) {
+		const 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_soc_component *component,
+			     struct snd_pcm_substream *substream)
+{
+	int err;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
+
+	snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
+
+	/* Ensure that all constraints linked to dma burst are fulfilled */
+	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 (!priv->substream_play && !priv->substream_rec) {
+		err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
+				  "kirkwood-i2s", priv);
+		if (err)
+			return err;
+
+		/*
+		 * Enable Error interrupts. We're only ack'ing them but
+		 * it's useful for diagnostics
+		 */
+		writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
+	}
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		if (priv->substream_play)
+			return -EBUSY;
+		priv->substream_play = substream;
+	} else {
+		if (priv->substream_rec)
+			return -EBUSY;
+		priv->substream_rec = substream;
+	}
+
+	return 0;
+}
+
+static int kirkwood_dma_close(struct snd_soc_component *component,
+			      struct snd_pcm_substream *substream)
+{
+	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
+
+	if (!priv)
+		return 0;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		priv->substream_play = NULL;
+	else
+		priv->substream_rec = NULL;
+
+	if (!priv->substream_play && !priv->substream_rec) {
+		writel(0, priv->io + KIRKWOOD_ERR_MASK);
+		free_irq(priv->irq, priv);
+	}
+
+	return 0;
+}
+
+static int kirkwood_dma_hw_params(struct snd_soc_component *component,
+				  struct snd_pcm_substream *substream,
+				  struct snd_pcm_hw_params *params)
+{
+	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
+	const struct mbus_dram_target_info *dram = mv_mbus_dram_info();
+	unsigned long addr = substream->runtime->dma_addr;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		kirkwood_dma_conf_mbus_windows(priv->io,
+			KIRKWOOD_PLAYBACK_WIN, addr, dram);
+	else
+		kirkwood_dma_conf_mbus_windows(priv->io,
+			KIRKWOOD_RECORD_WIN, addr, dram);
+	return 0;
+}
+
+static int kirkwood_dma_prepare(struct snd_soc_component *component,
+				struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
+	unsigned long size, count;
+
+	/* 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_soc_component *component,
+	struct snd_pcm_substream *substream)
+{
+	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
+	snd_pcm_uframes_t count;
+
+	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;
+}
+
+static int kirkwood_dma_new(struct snd_soc_component *component,
+			    struct snd_soc_pcm_runtime *rtd)
+{
+	size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
+	struct snd_card *card = rtd->card->snd_card;
+	int ret;
+
+	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
+
+	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
+				       card->dev, size, size);
+
+	return 0;
+}
+
+const struct snd_soc_component_driver kirkwood_soc_component = {
+	.name		= DRV_NAME,
+	.open		= kirkwood_dma_open,
+	.close		= kirkwood_dma_close,
+	.hw_params	= kirkwood_dma_hw_params,
+	.prepare	= kirkwood_dma_prepare,
+	.pointer	= kirkwood_dma_pointer,
+	.pcm_construct	= kirkwood_dma_new,
+};