From ef0a172403b45e9ea223a1ca7336e43ce1777e74 Mon Sep 17 00:00:00 2001
From: Shengjiu Wang <shengjiu.wang@freescale.com>
Date: Wed, 27 Aug 2014 14:52:50 +0800
Subject: MLK-11530-01 ASoC: fsl_hdmi: port hdmi audio driver

cherry-pick below patch from v3.14.y:
ENGR00330403-2: ASoC: fsl_hdmi: port hdmi audio driver from imx_3.10.y

Port HDMI audio driver (CPU driver, machine driver, platform driver) from
imx_3.10.y.

Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>

During 4.14 rebase converted from snd_pcm_ops.copy to copy_user because
copy was removed by upstream

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
[ Aisheng: fix conflicts for a clean base and merge MLK-12244
file onwership change ]
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
 sound/soc/fsl/imx-hdmi-dma.c | 1169 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1169 insertions(+)
 create mode 100644 sound/soc/fsl/imx-hdmi-dma.c

(limited to 'sound/soc/fsl/imx-hdmi-dma.c')

diff --git a/sound/soc/fsl/imx-hdmi-dma.c b/sound/soc/fsl/imx-hdmi-dma.c
new file mode 100644
index 000000000000..0c08e0042d6d
--- /dev/null
+++ b/sound/soc/fsl/imx-hdmi-dma.c
@@ -0,0 +1,1169 @@
+/*
+ * imx-hdmi-dma.c  --  HDMI DMA driver for ALSA Soc Audio Layer
+ *
+ * Copyright (C) 2011-2014 Freescale Semiconductor, Inc.
+ *
+ * based on imx-pcm-dma-mx2.c
+ * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * This code is based on code copyrighted by Freescale,
+ * Liam Girdwood, Javier Martin and probably others.
+ *
+ *  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/module.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/mfd/mxc-hdmi-core.h>
+#include <linux/platform_data/dma-imx.h>
+
+#include <video/mxc_hdmi.h>
+
+#include "imx-hdmi.h"
+
+#define HDMI_DMA_BURST_UNSPECIFIED_LEGNTH	0
+#define HDMI_DMA_BURST_INCR4			1
+#define HDMI_DMA_BURST_INCR8			2
+#define HDMI_DMA_BURST_INCR16			3
+
+#define HDMI_BASE_ADDR 0x00120000
+
+struct hdmi_sdma_script {
+	int control_reg_addr;
+	int status_reg_addr;
+	int dma_start_addr;
+	u32 buffer[20];
+};
+
+struct hdmi_dma_priv {
+	struct snd_pcm_substream *substream;
+	struct platform_device *pdev;
+
+	struct snd_dma_buffer hw_buffer;
+	unsigned long buffer_bytes;
+	unsigned long appl_bytes;
+
+	int periods;
+	int period_time;
+	int period_bytes;
+	int dma_period_bytes;
+	int buffer_ratio;
+
+	unsigned long offset;
+
+	snd_pcm_format_t format;
+	int sample_align;
+	int sample_bits;
+	int channels;
+	int rate;
+
+	int frame_idx;
+
+	bool tx_active;
+	spinlock_t irq_lock;
+
+	/* SDMA part */
+	dma_addr_t phy_hdmi_sdma_t;
+	struct hdmi_sdma_script *hdmi_sdma_t;
+	struct dma_chan *dma_channel;
+	struct dma_async_tx_descriptor *desc;
+	struct imx_hdmi_sdma_params sdma_params;
+};
+
+/* bit 0:0:0:b:p(0):c:(u)0:(v)0 */
+/* max 8 channels supported; channels are interleaved */
+static u8 g_packet_head_table[48 * 8];
+
+void hdmi_dma_copy_16_neon_lut(unsigned short *src, unsigned int *dst,
+		int samples, unsigned char *lookup_table);
+void hdmi_dma_copy_16_neon_fast(unsigned short *src, unsigned int *dst,
+		int samples);
+void hdmi_dma_copy_24_neon_lut(unsigned int *src, unsigned int *dst,
+		int samples, unsigned char *lookup_table);
+void hdmi_dma_copy_24_neon_fast(unsigned int *src, unsigned int *dst,
+		int samples);
+static void hdmi_dma_irq_enable(struct hdmi_dma_priv *priv);
+static void hdmi_dma_irq_disable(struct hdmi_dma_priv *priv);
+
+union hdmi_audio_header_t iec_header;
+EXPORT_SYMBOL(iec_header);
+
+/*
+ * Note that the period size for DMA != period size for ALSA because the
+ * driver adds iec frame info to the audio samples (in hdmi_dma_copy).
+ *
+ * Each 4 byte subframe = 1 byte of iec data + 3 byte audio sample.
+ *
+ * A 16 bit audio sample becomes 32 bits including the frame info. Ratio=2
+ * A 24 bit audio sample becomes 32 bits including the frame info. Ratio=3:4
+ * If the 24 bit raw audio is in 32 bit words, the
+ *
+ *  Original  Packed into  subframe  Ratio of size        Format
+ *   sample    how many      size    of DMA buffer
+ *   (bits)      bits                to ALSA buffer
+ *  --------  -----------  --------  --------------  ------------------------
+ *     16         16          32          2          SNDRV_PCM_FORMAT_S16_LE
+ *     24         24          32          1.33       SNDRV_PCM_FORMAT_S24_3LE*
+ *     24         32          32          1          SNDRV_PCM_FORMAT_S24_LE
+ *
+ * *so SNDRV_PCM_FORMAT_S24_3LE is not supported.
+ */
+
+/*
+ * The minimum dma period is one IEC audio frame (192 * 4 * channels).
+ * The maximum dma period for the HDMI DMA is 8K.
+ *
+ *   channels       minimum          maximum
+ *                 dma period       dma period
+ *   --------  ------------------   ----------
+ *       2     192 * 4 * 2 = 1536   * 4 = 6144
+ *       4     192 * 4 * 4 = 3072   * 2 = 6144
+ *       6     192 * 4 * 6 = 4608   * 1 = 4608
+ *       8     192 * 4 * 8 = 6144   * 1 = 6144
+ *
+ * Bottom line:
+ * 1. Must keep the ratio of DMA buffer to ALSA buffer consistent.
+ * 2. frame_idx is saved in the private data, so even if a frame cannot be
+ *    transmitted in a period, it can be continued in the next period.  This
+ *    is necessary for 6 ch.
+ */
+#define HDMI_DMA_PERIOD_BYTES		(12288)
+#define HDMI_DMA_BUF_SIZE		(128 * 1024)
+#define HDMI_PCM_BUF_SIZE		(128 * 1024)
+
+#define hdmi_audio_debug(dev, reg) \
+	dev_dbg(dev, #reg ": 0x%02x\n", hdmi_readb(reg))
+
+#ifdef DEBUG
+static void dumpregs(struct device *dev)
+{
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_CONF0);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_START);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_STOP);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_THRSLD);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_STRADDR0);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_STPADDR0);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_BSTADDR0);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_MBLENGTH0);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_MBLENGTH1);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_STAT);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_INT);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_MASK);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_POL);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_CONF1);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_BUFFSTAT);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_BUFFINT);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_BUFFMASK);
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_BUFFPOL);
+	hdmi_audio_debug(dev, HDMI_IH_MUTE_AHBDMAAUD_STAT0);
+	hdmi_audio_debug(dev, HDMI_IH_AHBDMAAUD_STAT0);
+	hdmi_audio_debug(dev, HDMI_IH_MUTE);
+}
+
+static void dumppriv(struct device *dev, struct hdmi_dma_priv *priv)
+{
+	dev_dbg(dev, "channels         = %d\n", priv->channels);
+	dev_dbg(dev, "periods          = %d\n", priv->periods);
+	dev_dbg(dev, "period_bytes     = %d\n", priv->period_bytes);
+	dev_dbg(dev, "dma period_bytes = %d\n", priv->dma_period_bytes);
+	dev_dbg(dev, "buffer_ratio     = %d\n", priv->buffer_ratio);
+	dev_dbg(dev, "hw dma buffer    = 0x%08x\n", (int)priv->hw_buffer.addr);
+	dev_dbg(dev, "dma buf size     = %d\n", (int)priv->buffer_bytes);
+	dev_dbg(dev, "sample_rate      = %d\n", (int)priv->rate);
+}
+#else
+static void dumpregs(struct device *dev) {}
+static void dumppriv(struct device *dev, struct hdmi_dma_priv *priv) {}
+#endif
+
+/*
+ * Conditions for DMA to work:
+ * ((final_addr - initial_addr)>>2)+1) < 2k.  So max period is 8k.
+ * (inital_addr & 0x3) == 0
+ * (final_addr  & 0x3) == 0x3
+ *
+ * The DMA Period should be an integer multiple of the IEC 60958 audio
+ * frame size, which is 768 bytes (192 * 4).
+ */
+static void hdmi_dma_set_addr(int start_addr, int dma_period_bytes)
+{
+	int final_addr = start_addr + dma_period_bytes - 1;
+
+	hdmi_write4(start_addr, HDMI_AHB_DMA_STRADDR0);
+	hdmi_write4(final_addr, HDMI_AHB_DMA_STPADDR0);
+}
+
+static void hdmi_dma_irq_set(bool set)
+{
+	u8 val = hdmi_readb(HDMI_AHB_DMA_MASK);
+
+	if (set)
+		val |= HDMI_AHB_DMA_DONE;
+	else
+		val &= (u8)~HDMI_AHB_DMA_DONE;
+
+	hdmi_writeb(val, HDMI_AHB_DMA_MASK);
+}
+
+static void hdmi_mask(int mask)
+{
+	u8 regval = hdmi_readb(HDMI_AHB_DMA_MASK);
+
+	if (mask)
+		regval |= HDMI_AHB_DMA_ERROR | HDMI_AHB_DMA_FIFO_EMPTY;
+	else
+		regval &= (u8)~(HDMI_AHB_DMA_ERROR | HDMI_AHB_DMA_FIFO_EMPTY);
+
+	hdmi_writeb(regval, HDMI_AHB_DMA_MASK);
+}
+
+int odd_ones(unsigned a)
+{
+	a ^= a >> 8;
+	a ^= a >> 4;
+	a ^= a >> 2;
+	a ^= a >> 1;
+
+	return a & 1;
+}
+
+/* Add frame information for one pcm subframe */
+static u32 hdmi_dma_add_frame_info(struct hdmi_dma_priv *priv,
+				   u32 pcm_data, int subframe_idx)
+{
+	union hdmi_audio_dma_data_t subframe;
+
+	subframe.U = 0;
+	iec_header.B.channel = subframe_idx;
+
+	/* fill b (start-of-block) */
+	subframe.B.b = (priv->frame_idx == 0) ? 1 : 0;
+
+	/* fill c (channel status) */
+	if (priv->frame_idx < 42)
+		subframe.B.c = (iec_header.U >> priv->frame_idx) & 0x1;
+	else
+		subframe.B.c = 0;
+
+	subframe.B.p = odd_ones(pcm_data);
+	subframe.B.p ^= subframe.B.c;
+	subframe.B.p ^= subframe.B.u;
+	subframe.B.p ^= subframe.B.v;
+
+	/* fill data */
+	if (priv->sample_bits == 16)
+		subframe.B.data = pcm_data << 8;
+	else
+		subframe.B.data = pcm_data;
+
+	return subframe.U;
+}
+
+static void init_table(int channels)
+{
+	unsigned char *p = g_packet_head_table;
+	int i, ch = 0;
+
+	for (i = 0; i < 48; i++) {
+		int b = 0;
+		if (i == 0)
+			b = 1;
+
+		for (ch = 0; ch < channels; ch++) {
+			int c = 0;
+			if (i < 42) {
+				iec_header.B.channel = ch+1;
+				c = (iec_header.U >> i) & 0x1;
+			}
+			/* preset bit p as c */
+			*p++ = (b << 4) | (c << 2) | (c << 3);
+		}
+	}
+}
+
+/*
+ * FIXME: Disable NEON Optimization in hdmi, or it will cause crash of
+ * pulseaudio in the userspace. There is no issue for the Optimization
+ * implemenation, if only use "VPUSH, VPOP" in the function, the pulseaudio
+ * will crash also. So for my assumption, we can't use the NEON in the
+ * interrupt.(tasklet is implemented by softirq.)
+ * Disable SMP, preempt, change the dma buffer to nocached, add protection of
+ * Dn register and fpscr, all these operation have no effect to the result.
+ */
+#define HDMI_DMA_NO_NEON
+
+#ifdef HDMI_DMA_NO_NEON
+/* Optimization for IEC head */
+static void hdmi_dma_copy_16_c_lut(u16 *src, u32 *dst, int samples,
+				u8 *lookup_table)
+{
+	u32 sample, head, p;
+	int i;
+
+	for (i = 0; i < samples; i++) {
+		/* get source sample */
+		sample = *src++;
+
+		/* xor every bit */
+		p = sample ^ (sample >> 8);
+		p ^= (p >> 4);
+		p ^= (p >> 2);
+		p ^= (p >> 1);
+		p &= 1;	/* only want last bit */
+		p <<= 3; /* bit p */
+
+		/* get packet header */
+		head = *lookup_table++;
+
+		/* fix head */
+		head ^= p;
+
+		/* store */
+		*dst++ = (head << 24) | (sample << 8);
+	}
+}
+
+static void hdmi_dma_copy_16_c_fast(u16 *src, u32 *dst, int samples)
+{
+	u32 sample, p;
+	int i;
+
+	for (i = 0; i < samples; i++) {
+		/* get source sample */
+		sample = *src++;
+
+		/* xor every bit */
+		p = sample ^ (sample >> 8);
+		p ^= (p >> 4);
+		p ^= (p >> 2);
+		p ^= (p >> 1);
+		p &= 1;	/* only want last bit */
+		p <<= 3; /* bit p */
+
+		/* store */
+		*dst++ = (p << 24) | (sample << 8);
+	}
+}
+
+static void hdmi_dma_copy_16(u16 *src, u32 *dst, int framecnt, int channelcnt)
+{
+	/* split input frames into 192-frame each */
+	int count_in_192 = (framecnt + 191) / 192;
+	int i;
+
+	for (i = 0; i < count_in_192; i++) {
+		int count, samples;
+
+		/* handles frame index [0, 48) */
+		count = (framecnt < 48) ? framecnt : 48;
+		samples = count * channelcnt;
+		hdmi_dma_copy_16_c_lut(src, dst, samples, g_packet_head_table);
+		framecnt -= count;
+		if (framecnt == 0)
+			break;
+
+		src  += samples;
+		dst += samples;
+
+		/* handles frame index [48, 192) */
+		count = (framecnt < 192 - 48) ? framecnt : 192 - 48;
+		samples = count * channelcnt;
+		hdmi_dma_copy_16_c_fast(src, dst, samples);
+		framecnt -= count;
+		src  += samples;
+		dst += samples;
+	}
+}
+#else
+/* NEON optimization for IEC head*/
+
+/**
+ * Convert pcm samples to iec samples suitable for HDMI transfer.
+ * PCM sample is 16 bits length.
+ * Frame index always starts from 0.
+ * Channel count can be 1, 2, 4, 6, or 8
+ * Sample count (frame_count * channel_count) is multipliable by 8.
+ */
+static void hdmi_dma_copy_16(u16 *src, u32 *dst, int framecount, int channelcount)
+{
+	/* split input frames into 192-frame each */
+	int i, count_in_192 = (framecount + 191) / 192;
+
+	for (i = 0; i < count_in_192; i++) {
+		int count, samples;
+
+		/* handles frame index [0, 48) */
+		count = (framecount < 48) ? framecount : 48;
+		samples = count * channelcount;
+		hdmi_dma_copy_16_neon_lut(src, dst, samples, g_packet_head_table);
+		framecount -= count;
+		if (framecount == 0)
+			break;
+
+		src += samples;
+		dst += samples;
+
+		/* handles frame index [48, 192) */
+		count = (framecount < 192 - 48) ? framecount : (192 - 48);
+		samples = count * channelcount;
+		hdmi_dma_copy_16_neon_fast(src, dst, samples);
+		framecount -= count;
+		src += samples;
+		dst += samples;
+	}
+}
+#endif
+
+static void hdmi_dma_mmap_copy(struct snd_pcm_substream *substream,
+				int offset, int count)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct hdmi_dma_priv *priv = runtime->private_data;
+	struct device *dev = rtd->platform->dev;
+	u32 framecount, *dst;
+	u16 *src16;
+
+	framecount = count / (priv->sample_align * priv->channels);
+
+	/* hw_buffer is the destination for pcm data plus frame info. */
+	dst = (u32 *)(priv->hw_buffer.area + (offset * priv->buffer_ratio));
+
+	switch (priv->format) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		/* dma_buffer is the mmapped buffer we are copying pcm from. */
+		src16 = (u16 *)(runtime->dma_area + offset);
+		hdmi_dma_copy_16(src16, dst, framecount, priv->channels);
+		break;
+	default:
+		dev_err(dev, "unsupported sample format %s\n",
+				snd_pcm_format_name(priv->format));
+		return;
+	}
+}
+
+static void hdmi_dma_data_copy(struct snd_pcm_substream *substream,
+				struct hdmi_dma_priv *priv, char type)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	unsigned long offset, count, appl_bytes, space_to_end;
+
+	if (runtime->access != SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)
+		return;
+
+	appl_bytes = frames_to_bytes(runtime, runtime->status->hw_ptr);
+	if (type == 'p')
+		appl_bytes += 2 * priv->period_bytes;
+	offset = appl_bytes % priv->buffer_bytes;
+
+	switch (type) {
+	case 'p':
+		count = priv->period_bytes;
+		space_to_end = priv->period_bytes;
+		break;
+	case 'b':
+		count = priv->buffer_bytes;
+		space_to_end = priv->buffer_bytes - offset;
+
+		break;
+	default:
+		return;
+	}
+
+	if (count <= space_to_end) {
+		hdmi_dma_mmap_copy(substream, offset, count);
+	} else {
+		hdmi_dma_mmap_copy(substream, offset, space_to_end);
+		hdmi_dma_mmap_copy(substream, 0, count - space_to_end);
+	}
+}
+
+static void hdmi_sdma_callback(void *data)
+{
+	struct hdmi_dma_priv *priv = (struct hdmi_dma_priv *)data;
+	struct snd_pcm_substream *substream = priv->substream;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+
+	if (runtime && runtime->dma_area && priv->tx_active) {
+		priv->offset += priv->period_bytes;
+		priv->offset %= priv->period_bytes * priv->periods;
+
+		/* Copy data by period_bytes */
+		hdmi_dma_data_copy(substream, priv, 'p');
+
+		snd_pcm_period_elapsed(substream);
+	}
+
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+
+	return;
+}
+
+static int hdmi_dma_set_thrsld_incrtype(struct device *dev, int channels)
+{
+	u8 mask = HDMI_AHB_DMA_CONF0_BURST_MODE | HDMI_AHB_DMA_CONF0_INCR_TYPE_MASK;
+	u8 val = hdmi_readb(HDMI_AHB_DMA_CONF0) & ~mask;
+	int incr_type, threshold;
+
+	switch (hdmi_readb(HDMI_REVISION_ID)) {
+	case 0x0a:
+		incr_type = HDMI_DMA_BURST_INCR4;
+		if (channels == 2)
+			threshold = 126;
+		else
+			threshold = 124;
+		break;
+	case 0x1a:
+		incr_type = HDMI_DMA_BURST_INCR8;
+		threshold = 128;
+		break;
+	default:
+		dev_err(dev, "unknown hdmi controller!\n");
+		return -ENODEV;
+	}
+
+	hdmi_writeb(threshold, HDMI_AHB_DMA_THRSLD);
+
+	switch (incr_type) {
+	case HDMI_DMA_BURST_UNSPECIFIED_LEGNTH:
+		break;
+	case HDMI_DMA_BURST_INCR4:
+		val |= HDMI_AHB_DMA_CONF0_BURST_MODE;
+		break;
+	case HDMI_DMA_BURST_INCR8:
+		val |= HDMI_AHB_DMA_CONF0_BURST_MODE |
+			 HDMI_AHB_DMA_CONF0_INCR8;
+		break;
+	case HDMI_DMA_BURST_INCR16:
+		val |= HDMI_AHB_DMA_CONF0_BURST_MODE |
+			 HDMI_AHB_DMA_CONF0_INCR16;
+		break;
+	default:
+		dev_err(dev, "invalid increment type: %d!", incr_type);
+		return -EINVAL;
+	}
+
+	hdmi_writeb(val, HDMI_AHB_DMA_CONF0);
+
+	hdmi_audio_debug(dev, HDMI_AHB_DMA_THRSLD);
+
+	return 0;
+}
+
+static int hdmi_dma_configure_dma(struct device *dev, int channels)
+{
+	u8 i, val = 0;
+	int ret;
+
+	if (channels <= 0 || channels > 8 || channels % 2 != 0) {
+		dev_err(dev, "unsupported channel number: %d\n", channels);
+		return -EINVAL;
+	}
+
+	hdmi_audio_writeb(AHB_DMA_CONF0, EN_HLOCK, 0x1);
+
+	ret = hdmi_dma_set_thrsld_incrtype(dev, channels);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < channels; i += 2)
+		val |= 0x3 << i;
+
+	hdmi_writeb(val, HDMI_AHB_DMA_CONF1);
+
+	return 0;
+}
+
+static void hdmi_dma_init_iec_header(void)
+{
+	iec_header.U = 0;
+
+	iec_header.B.consumer = 0;		/* Consumer use */
+	iec_header.B.linear_pcm = 0;		/* linear pcm audio */
+	iec_header.B.copyright = 1;		/* no copyright */
+	iec_header.B.pre_emphasis = 0;		/* 2 channels without pre-emphasis */
+	iec_header.B.mode = 0;			/* Mode 0 */
+
+	iec_header.B.category_code = 0;
+
+	iec_header.B.source = 2;		/* stereo */
+	iec_header.B.channel = 0;
+
+	iec_header.B.sample_freq = 0x02;	/* 48 KHz */
+	iec_header.B.clock_acc = 0;		/* Level II */
+
+	iec_header.B.word_length = 0x02;	/* 16 bits */
+	iec_header.B.org_sample_freq = 0x0D;	/* 48 KHz */
+
+	iec_header.B.cgms_a = 0;		/* Copying is permitted without restriction */
+}
+
+static int hdmi_dma_update_iec_header(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct hdmi_dma_priv *priv = runtime->private_data;
+	struct device *dev = rtd->platform->dev;
+
+	iec_header.B.source = priv->channels;
+
+	switch (priv->rate) {
+	case 32000:
+		iec_header.B.sample_freq = 0x03;
+		iec_header.B.org_sample_freq = 0x0C;
+		break;
+	case 44100:
+		iec_header.B.sample_freq = 0x00;
+		iec_header.B.org_sample_freq = 0x0F;
+		break;
+	case 48000:
+		iec_header.B.sample_freq = 0x02;
+		iec_header.B.org_sample_freq = 0x0D;
+		break;
+	case 88200:
+		iec_header.B.sample_freq = 0x08;
+		iec_header.B.org_sample_freq = 0x07;
+		break;
+	case 96000:
+		iec_header.B.sample_freq = 0x0A;
+		iec_header.B.org_sample_freq = 0x05;
+		break;
+	case 176400:
+		iec_header.B.sample_freq = 0x0C;
+		iec_header.B.org_sample_freq = 0x03;
+		break;
+	case 192000:
+		iec_header.B.sample_freq = 0x0E;
+		iec_header.B.org_sample_freq = 0x01;
+		break;
+	default:
+		dev_err(dev, "unsupported sample rate\n");
+		return -EFAULT;
+	}
+
+	switch (priv->format) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		iec_header.B.word_length = 0x02;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		iec_header.B.word_length = 0x0b;
+		break;
+	default:
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+/*
+ * The HDMI block transmits the audio data without adding any of the audio
+ * frame bits.  So we have to copy the raw dma data from the ALSA buffer
+ * to the DMA buffer, adding the frame information.
+ */
+static int hdmi_dma_copy_user(struct snd_pcm_substream *substream, int channel,
+			unsigned long pos_bytes, void __user *buf,
+			unsigned long count)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct hdmi_dma_priv *priv = runtime->private_data;
+	u32 *hw_buf;
+	int subframe_idx;
+	u32 pcm_data;
+
+	/* Adding frame info to pcm data from userspace and copy to hw_buffer */
+	hw_buf = (u32 *)(priv->hw_buffer.area + (pos_bytes * priv->buffer_ratio));
+
+	while (count > 0) {
+		for (subframe_idx = 1 ; subframe_idx <= priv->channels ; subframe_idx++) {
+			if (copy_from_user(&pcm_data, buf, priv->sample_align))
+				return -EFAULT;
+
+			buf += priv->sample_align;
+			count -= priv->sample_align;
+
+			/* Save the header info to the audio dma buffer */
+			*hw_buf++ = hdmi_dma_add_frame_info(priv, pcm_data, subframe_idx);
+		}
+
+		priv->frame_idx++;
+		if (priv->frame_idx == 192)
+			priv->frame_idx = 0;
+	}
+
+	return 0;
+}
+
+static int hdmi_sdma_initbuf(struct device *dev, struct hdmi_dma_priv *priv)
+{
+	struct hdmi_sdma_script *hdmi_sdma_t = priv->hdmi_sdma_t;
+	u32 *head, *tail, i;
+
+	if (!hdmi_sdma_t) {
+		dev_err(dev, "hdmi private addr invalid!!!\n");
+		return -EINVAL;
+	}
+
+	hdmi_sdma_t->control_reg_addr = HDMI_BASE_ADDR + HDMI_AHB_DMA_START;
+	hdmi_sdma_t->status_reg_addr = HDMI_BASE_ADDR + HDMI_IH_AHBDMAAUD_STAT0;
+	hdmi_sdma_t->dma_start_addr = HDMI_BASE_ADDR + HDMI_AHB_DMA_STRADDR0;
+
+	head = &hdmi_sdma_t->buffer[0];
+	tail = &hdmi_sdma_t->buffer[1];
+
+	for (i = 0; i < priv->sdma_params.buffer_num; i++) {
+		*head = priv->hw_buffer.addr + i * priv->period_bytes * priv->buffer_ratio;
+		*tail = *head + priv->dma_period_bytes - 1;
+		head += 2;
+		tail += 2;
+	}
+
+	return 0;
+}
+
+static int hdmi_sdma_config(struct snd_pcm_substream *substream,
+			struct hdmi_dma_priv *priv)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct device *dai_dev = &priv->pdev->dev;
+	struct device *dev = rtd->platform->dev;
+	struct dma_slave_config slave_config;
+	int ret;
+
+	priv->dma_channel = dma_request_slave_channel(dai_dev, "tx");
+	if (priv->dma_channel == NULL) {
+		dev_err(dev, "failed to alloc dma channel\n");
+		return -EBUSY;
+	}
+
+	slave_config.direction = DMA_TRANS_NONE;
+	slave_config.src_addr = (dma_addr_t)priv->sdma_params.buffer_num;
+	slave_config.dst_addr = (dma_addr_t)priv->sdma_params.phyaddr;
+
+	ret = dmaengine_slave_config(priv->dma_channel, &slave_config);
+	if (ret) {
+		dev_err(dev, "failed to config slave dma\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int hdmi_dma_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct hdmi_dma_priv *priv = runtime->private_data;
+
+	if (priv->dma_channel) {
+		dma_release_channel(priv->dma_channel);
+		priv->dma_channel = NULL;
+	}
+
+	return 0;
+}
+
+static int hdmi_dma_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct hdmi_dma_priv *priv = runtime->private_data;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct device *dev = rtd->platform->dev;
+	int ret;
+
+	priv->buffer_bytes = params_buffer_bytes(params);
+	priv->periods = params_periods(params);
+	priv->period_bytes = params_period_bytes(params);
+	priv->channels = params_channels(params);
+	priv->format = params_format(params);
+	priv->rate = params_rate(params);
+
+	priv->offset = 0;
+	priv->period_time = HZ / (priv->rate / params_period_size(params));
+
+	switch (priv->format) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		priv->buffer_ratio = 2;
+		priv->sample_align = 2;
+		priv->sample_bits = 16;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		/* 24 bit audio in 32 bit word */
+		priv->buffer_ratio = 1;
+		priv->sample_align = 4;
+		priv->sample_bits = 24;
+		break;
+	default:
+		dev_err(dev, "unsupported sample format: %d\n", priv->format);
+		return -EINVAL;
+	}
+
+	priv->dma_period_bytes = priv->period_bytes * priv->buffer_ratio;
+	priv->sdma_params.buffer_num = priv->periods;
+	priv->sdma_params.phyaddr = priv->phy_hdmi_sdma_t;
+
+	ret = hdmi_sdma_initbuf(dev, priv);
+	if (ret)
+		return ret;
+
+	ret = hdmi_sdma_config(substream, priv);
+	if (ret)
+		return ret;
+
+	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+	ret = hdmi_dma_configure_dma(dev, priv->channels);
+	if (ret)
+		return ret;
+
+	hdmi_dma_set_addr(priv->hw_buffer.addr, priv->dma_period_bytes);
+
+	dumppriv(dev, priv);
+
+	hdmi_dma_update_iec_header(substream);
+
+	/* Init par for mmap optimizate */
+	init_table(priv->channels);
+
+	priv->appl_bytes = 0;
+
+	return 0;
+}
+
+static void hdmi_dma_trigger_init(struct snd_pcm_substream *substream,
+				struct hdmi_dma_priv *priv)
+{
+	unsigned long status;
+
+	priv->offset = 0;
+	priv->frame_idx = 0;
+
+	/* Copy data by buffer_bytes */
+	hdmi_dma_data_copy(substream, priv, 'b');
+
+	hdmi_audio_writeb(AHB_DMA_CONF0, SW_FIFO_RST, 0x1);
+
+	/* Delay after reset */
+	udelay(1);
+
+	status = hdmi_readb(HDMI_IH_AHBDMAAUD_STAT0);
+	hdmi_writeb(status, HDMI_IH_AHBDMAAUD_STAT0);
+}
+
+static int hdmi_dma_prepare_and_submit(struct snd_pcm_substream *substream,
+					struct hdmi_dma_priv *priv)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct device *dev = rtd->platform->dev;
+
+	priv->desc = dmaengine_prep_dma_cyclic(priv->dma_channel, 0, 0, 0,
+						DMA_TRANS_NONE, 0);
+	if (!priv->desc) {
+		dev_err(dev, "failed to prepare slave dma\n");
+		return -EINVAL;
+	}
+
+	priv->desc->callback = hdmi_sdma_callback;
+	priv->desc->callback_param = (void *)priv;
+	dmaengine_submit(priv->desc);
+
+	return 0;
+}
+
+static int hdmi_dma_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct hdmi_dma_priv *priv = runtime->private_data;
+	struct device *dev = rtd->platform->dev;
+	int ret;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		if (!check_hdmi_state())
+			return 0;
+		hdmi_dma_trigger_init(substream, priv);
+
+		dumpregs(dev);
+
+		priv->tx_active = true;
+		hdmi_audio_writeb(AHB_DMA_START, START, 0x1);
+		hdmi_dma_irq_set(false);
+		hdmi_set_dma_mode(1);
+		ret = hdmi_dma_prepare_and_submit(substream, priv);
+		if (ret)
+			return ret;
+		dma_async_issue_pending(priv->desc->chan);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		dmaengine_terminate_all(priv->dma_channel);
+		hdmi_set_dma_mode(0);
+		hdmi_dma_irq_set(true);
+		hdmi_audio_writeb(AHB_DMA_STOP, STOP, 0x1);
+		priv->tx_active = false;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static snd_pcm_uframes_t hdmi_dma_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct hdmi_dma_priv *priv = runtime->private_data;
+
+	return bytes_to_frames(runtime, priv->offset);
+}
+
+static struct snd_pcm_hardware snd_imx_hardware = {
+	.info = SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		SNDRV_PCM_INFO_MMAP |
+		SNDRV_PCM_INFO_MMAP_VALID |
+		SNDRV_PCM_INFO_PAUSE |
+		SNDRV_PCM_INFO_RESUME,
+	.formats = MXC_HDMI_FORMATS_PLAYBACK,
+	.rate_min = 32000,
+	.channels_min = 2,
+	.channels_max = 8,
+	.buffer_bytes_max = HDMI_PCM_BUF_SIZE,
+	.period_bytes_min = HDMI_DMA_PERIOD_BYTES / 2,
+	.period_bytes_max = HDMI_DMA_PERIOD_BYTES / 2,
+	.periods_min = 8,
+	.periods_max = 8,
+	.fifo_size = 0,
+};
+
+static void hdmi_dma_irq_enable(struct hdmi_dma_priv *priv)
+{
+	unsigned long flags;
+
+	hdmi_writeb(0xff, HDMI_AHB_DMA_POL);
+	hdmi_writeb(0xff, HDMI_AHB_DMA_BUFFPOL);
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+
+	hdmi_writeb(0xff, HDMI_IH_AHBDMAAUD_STAT0);
+	hdmi_writeb(0xff, HDMI_IH_MUTE_AHBDMAAUD_STAT0);
+	hdmi_dma_irq_set(false);
+	hdmi_mask(0);
+
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static void hdmi_dma_irq_disable(struct hdmi_dma_priv *priv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->irq_lock, flags);
+
+	hdmi_dma_irq_set(true);
+	hdmi_writeb(0x0, HDMI_IH_MUTE_AHBDMAAUD_STAT0);
+	hdmi_writeb(0xff, HDMI_IH_AHBDMAAUD_STAT0);
+	hdmi_mask(1);
+
+	spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static int hdmi_dma_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct device *dev = rtd->platform->dev;
+	struct hdmi_dma_priv *priv = dev_get_drvdata(dev);
+	int ret;
+
+	runtime->private_data = priv;
+
+	ret = mxc_hdmi_register_audio(substream);
+	if (ret < 0) {
+		dev_err(dev, "HDMI Video is not ready!\n");
+		return ret;
+	}
+
+	hdmi_audio_writeb(AHB_DMA_CONF0, SW_FIFO_RST, 0x1);
+
+	ret = snd_pcm_hw_constraint_integer(substream->runtime,
+			SNDRV_PCM_HW_PARAM_PERIODS);
+	if (ret < 0)
+		return ret;
+
+	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
+
+	hdmi_dma_irq_enable(priv);
+
+	return 0;
+}
+
+static int hdmi_dma_close(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct hdmi_dma_priv *priv = runtime->private_data;
+
+	hdmi_dma_irq_disable(priv);
+	mxc_hdmi_unregister_audio(substream);
+
+	return 0;
+}
+
+static struct snd_pcm_ops imx_hdmi_dma_pcm_ops = {
+	.open		= hdmi_dma_open,
+	.close		= hdmi_dma_close,
+	.ioctl		= snd_pcm_lib_ioctl,
+	.hw_params	= hdmi_dma_hw_params,
+	.hw_free	= hdmi_dma_hw_free,
+	.trigger	= hdmi_dma_trigger,
+	.pointer	= hdmi_dma_pointer,
+	.copy_user	= hdmi_dma_copy_user,
+};
+
+static int imx_hdmi_dma_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+	struct hdmi_dma_priv *priv = dev_get_drvdata(rtd->platform->dev);
+	struct snd_card *card = rtd->card->snd_card;
+	struct snd_pcm_substream *substream;
+	struct snd_pcm *pcm = rtd->pcm;
+	u64 dma_mask = DMA_BIT_MASK(32);
+	int ret = 0;
+
+	if (!card->dev->dma_mask)
+		card->dev->dma_mask = &dma_mask;
+	if (!card->dev->coherent_dma_mask)
+		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+
+	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
+			HDMI_PCM_BUF_SIZE, &substream->dma_buffer);
+	if (ret) {
+		dev_err(card->dev, "failed to alloc playback dma buffer\n");
+		return ret;
+	}
+
+	priv->substream = substream;
+
+	/* Alloc the hw_buffer */
+	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
+			HDMI_DMA_BUF_SIZE, &priv->hw_buffer);
+	if (ret) {
+		dev_err(card->dev, "failed to alloc hw dma buffer\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+static void imx_hdmi_dma_pcm_free(struct snd_pcm *pcm)
+{
+	int stream = SNDRV_PCM_STREAM_PLAYBACK;
+	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+	struct snd_soc_pcm_runtime *rtd = pcm->private_data;
+	struct hdmi_dma_priv *priv = dev_get_drvdata(rtd->platform->dev);
+
+	if (substream) {
+		snd_dma_free_pages(&substream->dma_buffer);
+		substream->dma_buffer.area = NULL;
+		substream->dma_buffer.addr = 0;
+	}
+
+	/* Free the hw_buffer */
+	snd_dma_free_pages(&priv->hw_buffer);
+	priv->hw_buffer.area = NULL;
+	priv->hw_buffer.addr = 0;
+}
+
+static struct snd_soc_platform_driver imx_hdmi_platform = {
+	.ops		= &imx_hdmi_dma_pcm_ops,
+	.pcm_new	= imx_hdmi_dma_pcm_new,
+	.pcm_free	= imx_hdmi_dma_pcm_free,
+};
+
+static int imx_soc_platform_probe(struct platform_device *pdev)
+{
+	struct imx_hdmi *hdmi_drvdata = platform_get_drvdata(pdev);
+	struct hdmi_dma_priv *priv;
+	int ret = 0;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		dev_err(&pdev->dev, "Failed to alloc hdmi_dma\n");
+		return -ENOMEM;
+	}
+
+	priv->hdmi_sdma_t = dma_alloc_coherent(NULL,
+			sizeof(struct hdmi_sdma_script),
+			&priv->phy_hdmi_sdma_t, GFP_KERNEL);
+	if (!priv->hdmi_sdma_t) {
+		dev_err(&pdev->dev, "Failed to alloc hdmi_sdma_t\n");
+		return -ENOMEM;
+	}
+
+	priv->tx_active = false;
+	spin_lock_init(&priv->irq_lock);
+
+	priv->pdev = hdmi_drvdata->pdev;
+
+	hdmi_dma_init_iec_header();
+
+	dev_set_drvdata(&pdev->dev, priv);
+
+	switch (hdmi_readb(HDMI_REVISION_ID)) {
+	case 0x0a:
+		snd_imx_hardware.period_bytes_max = HDMI_DMA_PERIOD_BYTES / 4;
+		snd_imx_hardware.period_bytes_min = HDMI_DMA_PERIOD_BYTES / 4;
+		break;
+	default:
+		break;
+	}
+
+	ret = snd_soc_register_platform(&pdev->dev, &imx_hdmi_platform);
+	if (ret)
+		goto err_plat;
+
+	return 0;
+
+err_plat:
+	dma_free_coherent(NULL, sizeof(struct hdmi_sdma_script),
+			priv->hdmi_sdma_t, priv->phy_hdmi_sdma_t);
+
+	return ret;
+}
+
+static int imx_soc_platform_remove(struct platform_device *pdev)
+{
+	struct hdmi_dma_priv *priv = dev_get_drvdata(&pdev->dev);
+
+	dma_free_coherent(NULL, sizeof(struct hdmi_sdma_script),
+			priv->hdmi_sdma_t, priv->phy_hdmi_sdma_t);
+
+	snd_soc_unregister_platform(&pdev->dev);
+
+	return 0;
+}
+
+static struct platform_driver imx_hdmi_dma_driver = {
+	.driver = {
+		.name = "imx-hdmi-audio",
+		.owner = THIS_MODULE,
+	},
+	.probe = imx_soc_platform_probe,
+	.remove = imx_soc_platform_remove,
+};
+
+module_platform_driver(imx_hdmi_dma_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("i.MX HDMI audio DMA");
+MODULE_LICENSE("GPL");
-- 
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