Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 1251 insertions, 0 deletions

diff --git a/kernel/sound/atmel/ac97c.c b/kernel/sound/atmel/ac97c.c
new file mode 100644
index 000000000..6dad04263
--- /dev/null
+++ b/kernel/sound/atmel/ac97c.c
@@ -0,0 +1,1251 @@
+/*
+ * Driver for Atmel AC97C
+ *
+ * Copyright (C) 2005-2009 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/bitmap.h>
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/atmel_pdc.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/gpio.h>
+#include <linux/types.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_device.h>
+
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/ac97_codec.h>
+#include <sound/atmel-ac97c.h>
+#include <sound/memalloc.h>
+
+#include <linux/platform_data/dma-dw.h>
+#include <linux/dma/dw.h>
+
+#ifdef CONFIG_AVR32
+#include <mach/cpu.h>
+#else
+#define cpu_is_at32ap7000() 0
+#endif
+
+#include "ac97c.h"
+
+enum {
+	DMA_TX_READY = 0,
+	DMA_RX_READY,
+	DMA_TX_CHAN_PRESENT,
+	DMA_RX_CHAN_PRESENT,
+};
+
+/* Serialize access to opened variable */
+static DEFINE_MUTEX(opened_mutex);
+
+struct atmel_ac97c_dma {
+	struct dma_chan			*rx_chan;
+	struct dma_chan			*tx_chan;
+};
+
+struct atmel_ac97c {
+	struct clk			*pclk;
+	struct platform_device		*pdev;
+	struct atmel_ac97c_dma		dma;
+
+	struct snd_pcm_substream	*playback_substream;
+	struct snd_pcm_substream	*capture_substream;
+	struct snd_card			*card;
+	struct snd_pcm			*pcm;
+	struct snd_ac97			*ac97;
+	struct snd_ac97_bus		*ac97_bus;
+
+	u64				cur_format;
+	unsigned int			cur_rate;
+	unsigned long			flags;
+	int				playback_period, capture_period;
+	/* Serialize access to opened variable */
+	spinlock_t			lock;
+	void __iomem			*regs;
+	int				irq;
+	int				opened;
+	int				reset_pin;
+};
+
+#define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
+
+#define ac97c_writel(chip, reg, val)			\
+	__raw_writel((val), (chip)->regs + AC97C_##reg)
+#define ac97c_readl(chip, reg)				\
+	__raw_readl((chip)->regs + AC97C_##reg)
+
+/* This function is called by the DMA driver. */
+static void atmel_ac97c_dma_playback_period_done(void *arg)
+{
+	struct atmel_ac97c *chip = arg;
+	snd_pcm_period_elapsed(chip->playback_substream);
+}
+
+static void atmel_ac97c_dma_capture_period_done(void *arg)
+{
+	struct atmel_ac97c *chip = arg;
+	snd_pcm_period_elapsed(chip->capture_substream);
+}
+
+static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
+		struct snd_pcm_substream *substream,
+		enum dma_transfer_direction direction)
+{
+	struct dma_chan			*chan;
+	struct dw_cyclic_desc		*cdesc;
+	struct snd_pcm_runtime		*runtime = substream->runtime;
+	unsigned long			buffer_len, period_len;
+
+	/*
+	 * We don't do DMA on "complex" transfers, i.e. with
+	 * non-halfword-aligned buffers or lengths.
+	 */
+	if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
+		dev_dbg(&chip->pdev->dev, "too complex transfer\n");
+		return -EINVAL;
+	}
+
+	if (direction == DMA_MEM_TO_DEV)
+		chan = chip->dma.tx_chan;
+	else
+		chan = chip->dma.rx_chan;
+
+	buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
+	period_len = frames_to_bytes(runtime, runtime->period_size);
+
+	cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
+			period_len, direction);
+	if (IS_ERR(cdesc)) {
+		dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
+		return PTR_ERR(cdesc);
+	}
+
+	if (direction == DMA_MEM_TO_DEV) {
+		cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
+		set_bit(DMA_TX_READY, &chip->flags);
+	} else {
+		cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
+		set_bit(DMA_RX_READY, &chip->flags);
+	}
+
+	cdesc->period_callback_param = chip;
+
+	return 0;
+}
+
+static struct snd_pcm_hardware atmel_ac97c_hw = {
+	.info			= (SNDRV_PCM_INFO_MMAP
+				  | SNDRV_PCM_INFO_MMAP_VALID
+				  | SNDRV_PCM_INFO_INTERLEAVED
+				  | SNDRV_PCM_INFO_BLOCK_TRANSFER
+				  | SNDRV_PCM_INFO_JOINT_DUPLEX
+				  | SNDRV_PCM_INFO_RESUME
+				  | SNDRV_PCM_INFO_PAUSE),
+	.formats		= (SNDRV_PCM_FMTBIT_S16_BE
+				  | SNDRV_PCM_FMTBIT_S16_LE),
+	.rates			= (SNDRV_PCM_RATE_CONTINUOUS),
+	.rate_min		= 4000,
+	.rate_max		= 48000,
+	.channels_min		= 1,
+	.channels_max		= 2,
+	.buffer_bytes_max	= 2 * 2 * 64 * 2048,
+	.period_bytes_min	= 4096,
+	.period_bytes_max	= 4096,
+	.periods_min		= 6,
+	.periods_max		= 64,
+};
+
+static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	mutex_lock(&opened_mutex);
+	chip->opened++;
+	runtime->hw = atmel_ac97c_hw;
+	if (chip->cur_rate) {
+		runtime->hw.rate_min = chip->cur_rate;
+		runtime->hw.rate_max = chip->cur_rate;
+	}
+	if (chip->cur_format)
+		runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
+	mutex_unlock(&opened_mutex);
+	chip->playback_substream = substream;
+	return 0;
+}
+
+static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	mutex_lock(&opened_mutex);
+	chip->opened++;
+	runtime->hw = atmel_ac97c_hw;
+	if (chip->cur_rate) {
+		runtime->hw.rate_min = chip->cur_rate;
+		runtime->hw.rate_max = chip->cur_rate;
+	}
+	if (chip->cur_format)
+		runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
+	mutex_unlock(&opened_mutex);
+	chip->capture_substream = substream;
+	return 0;
+}
+
+static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+
+	mutex_lock(&opened_mutex);
+	chip->opened--;
+	if (!chip->opened) {
+		chip->cur_rate = 0;
+		chip->cur_format = 0;
+	}
+	mutex_unlock(&opened_mutex);
+
+	chip->playback_substream = NULL;
+
+	return 0;
+}
+
+static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+
+	mutex_lock(&opened_mutex);
+	chip->opened--;
+	if (!chip->opened) {
+		chip->cur_rate = 0;
+		chip->cur_format = 0;
+	}
+	mutex_unlock(&opened_mutex);
+
+	chip->capture_substream = NULL;
+
+	return 0;
+}
+
+static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
+		struct snd_pcm_hw_params *hw_params)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+	int retval;
+
+	retval = snd_pcm_lib_malloc_pages(substream,
+					params_buffer_bytes(hw_params));
+	if (retval < 0)
+		return retval;
+	/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
+	if (cpu_is_at32ap7000()) {
+		/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
+		if (retval == 1)
+			if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
+				dw_dma_cyclic_free(chip->dma.tx_chan);
+	}
+	/* Set restrictions to params. */
+	mutex_lock(&opened_mutex);
+	chip->cur_rate = params_rate(hw_params);
+	chip->cur_format = params_format(hw_params);
+	mutex_unlock(&opened_mutex);
+
+	return retval;
+}
+
+static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
+		struct snd_pcm_hw_params *hw_params)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+	int retval;
+
+	retval = snd_pcm_lib_malloc_pages(substream,
+					params_buffer_bytes(hw_params));
+	if (retval < 0)
+		return retval;
+	/* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
+	if (cpu_is_at32ap7000() && retval == 1)
+		if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
+			dw_dma_cyclic_free(chip->dma.rx_chan);
+
+	/* Set restrictions to params. */
+	mutex_lock(&opened_mutex);
+	chip->cur_rate = params_rate(hw_params);
+	chip->cur_format = params_format(hw_params);
+	mutex_unlock(&opened_mutex);
+
+	return retval;
+}
+
+static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+	if (cpu_is_at32ap7000()) {
+		if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
+			dw_dma_cyclic_free(chip->dma.tx_chan);
+	}
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+	if (cpu_is_at32ap7000()) {
+		if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
+			dw_dma_cyclic_free(chip->dma.rx_chan);
+	}
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int block_size = frames_to_bytes(runtime, runtime->period_size);
+	unsigned long word = ac97c_readl(chip, OCA);
+	int retval;
+
+	chip->playback_period = 0;
+	word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
+
+	/* assign channels to AC97C channel A */
+	switch (runtime->channels) {
+	case 1:
+		word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
+		break;
+	case 2:
+		word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
+			| AC97C_CH_ASSIGN(PCM_RIGHT, A);
+		break;
+	default:
+		/* TODO: support more than two channels */
+		return -EINVAL;
+	}
+	ac97c_writel(chip, OCA, word);
+
+	/* configure sample format and size */
+	word = ac97c_readl(chip, CAMR);
+	if (chip->opened <= 1)
+		word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
+	else
+		word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
+
+	switch (runtime->format) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		if (cpu_is_at32ap7000())
+			word |= AC97C_CMR_CEM_LITTLE;
+		break;
+	case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
+		word &= ~(AC97C_CMR_CEM_LITTLE);
+		break;
+	default:
+		word = ac97c_readl(chip, OCA);
+		word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
+		ac97c_writel(chip, OCA, word);
+		return -EINVAL;
+	}
+
+	/* Enable underrun interrupt on channel A */
+	word |= AC97C_CSR_UNRUN;
+
+	ac97c_writel(chip, CAMR, word);
+
+	/* Enable channel A event interrupt */
+	word = ac97c_readl(chip, IMR);
+	word |= AC97C_SR_CAEVT;
+	ac97c_writel(chip, IER, word);
+
+	/* set variable rate if needed */
+	if (runtime->rate != 48000) {
+		word = ac97c_readl(chip, MR);
+		word |= AC97C_MR_VRA;
+		ac97c_writel(chip, MR, word);
+	} else {
+		word = ac97c_readl(chip, MR);
+		word &= ~(AC97C_MR_VRA);
+		ac97c_writel(chip, MR, word);
+	}
+
+	retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
+			runtime->rate);
+	if (retval)
+		dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
+				runtime->rate);
+
+	if (cpu_is_at32ap7000()) {
+		if (!test_bit(DMA_TX_READY, &chip->flags))
+			retval = atmel_ac97c_prepare_dma(chip, substream,
+					DMA_MEM_TO_DEV);
+	} else {
+		/* Initialize and start the PDC */
+		writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
+		writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
+		writel(runtime->dma_addr + block_size,
+				chip->regs + ATMEL_PDC_TNPR);
+		writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
+	}
+
+	return retval;
+}
+
+static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int block_size = frames_to_bytes(runtime, runtime->period_size);
+	unsigned long word = ac97c_readl(chip, ICA);
+	int retval;
+
+	chip->capture_period = 0;
+	word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
+
+	/* assign channels to AC97C channel A */
+	switch (runtime->channels) {
+	case 1:
+		word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
+		break;
+	case 2:
+		word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
+			| AC97C_CH_ASSIGN(PCM_RIGHT, A);
+		break;
+	default:
+		/* TODO: support more than two channels */
+		return -EINVAL;
+	}
+	ac97c_writel(chip, ICA, word);
+
+	/* configure sample format and size */
+	word = ac97c_readl(chip, CAMR);
+	if (chip->opened <= 1)
+		word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
+	else
+		word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
+
+	switch (runtime->format) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		if (cpu_is_at32ap7000())
+			word |= AC97C_CMR_CEM_LITTLE;
+		break;
+	case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
+		word &= ~(AC97C_CMR_CEM_LITTLE);
+		break;
+	default:
+		word = ac97c_readl(chip, ICA);
+		word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
+		ac97c_writel(chip, ICA, word);
+		return -EINVAL;
+	}
+
+	/* Enable overrun interrupt on channel A */
+	word |= AC97C_CSR_OVRUN;
+
+	ac97c_writel(chip, CAMR, word);
+
+	/* Enable channel A event interrupt */
+	word = ac97c_readl(chip, IMR);
+	word |= AC97C_SR_CAEVT;
+	ac97c_writel(chip, IER, word);
+
+	/* set variable rate if needed */
+	if (runtime->rate != 48000) {
+		word = ac97c_readl(chip, MR);
+		word |= AC97C_MR_VRA;
+		ac97c_writel(chip, MR, word);
+	} else {
+		word = ac97c_readl(chip, MR);
+		word &= ~(AC97C_MR_VRA);
+		ac97c_writel(chip, MR, word);
+	}
+
+	retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
+			runtime->rate);
+	if (retval)
+		dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
+				runtime->rate);
+
+	if (cpu_is_at32ap7000()) {
+		if (!test_bit(DMA_RX_READY, &chip->flags))
+			retval = atmel_ac97c_prepare_dma(chip, substream,
+					DMA_DEV_TO_MEM);
+	} else {
+		/* Initialize and start the PDC */
+		writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
+		writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
+		writel(runtime->dma_addr + block_size,
+				chip->regs + ATMEL_PDC_RNPR);
+		writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
+	}
+
+	return retval;
+}
+
+static int
+atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+	unsigned long camr, ptcr = 0;
+	int retval = 0;
+
+	camr = ac97c_readl(chip, CAMR);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
+	case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
+	case SNDRV_PCM_TRIGGER_START:
+		if (cpu_is_at32ap7000()) {
+			retval = dw_dma_cyclic_start(chip->dma.tx_chan);
+			if (retval)
+				goto out;
+		} else {
+			ptcr = ATMEL_PDC_TXTEN;
+		}
+		camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
+	case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
+	case SNDRV_PCM_TRIGGER_STOP:
+		if (cpu_is_at32ap7000())
+			dw_dma_cyclic_stop(chip->dma.tx_chan);
+		else
+			ptcr |= ATMEL_PDC_TXTDIS;
+		if (chip->opened <= 1)
+			camr &= ~AC97C_CMR_CENA;
+		break;
+	default:
+		retval = -EINVAL;
+		goto out;
+	}
+
+	ac97c_writel(chip, CAMR, camr);
+	if (!cpu_is_at32ap7000())
+		writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
+out:
+	return retval;
+}
+
+static int
+atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
+	unsigned long camr, ptcr = 0;
+	int retval = 0;
+
+	camr = ac97c_readl(chip, CAMR);
+	ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
+	case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
+	case SNDRV_PCM_TRIGGER_START:
+		if (cpu_is_at32ap7000()) {
+			retval = dw_dma_cyclic_start(chip->dma.rx_chan);
+			if (retval)
+				goto out;
+		} else {
+			ptcr = ATMEL_PDC_RXTEN;
+		}
+		camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
+	case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
+	case SNDRV_PCM_TRIGGER_STOP:
+		if (cpu_is_at32ap7000())
+			dw_dma_cyclic_stop(chip->dma.rx_chan);
+		else
+			ptcr |= (ATMEL_PDC_RXTDIS);
+		if (chip->opened <= 1)
+			camr &= ~AC97C_CMR_CENA;
+		break;
+	default:
+		retval = -EINVAL;
+		break;
+	}
+
+	ac97c_writel(chip, CAMR, camr);
+	if (!cpu_is_at32ap7000())
+		writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
+out:
+	return retval;
+}
+
+static snd_pcm_uframes_t
+atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
+{
+	struct atmel_ac97c	*chip = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime	*runtime = substream->runtime;
+	snd_pcm_uframes_t	frames;
+	unsigned long		bytes;
+
+	if (cpu_is_at32ap7000())
+		bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
+	else
+		bytes = readl(chip->regs + ATMEL_PDC_TPR);
+	bytes -= runtime->dma_addr;
+
+	frames = bytes_to_frames(runtime, bytes);
+	if (frames >= runtime->buffer_size)
+		frames -= runtime->buffer_size;
+	return frames;
+}
+
+static snd_pcm_uframes_t
+atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
+{
+	struct atmel_ac97c	*chip = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime	*runtime = substream->runtime;
+	snd_pcm_uframes_t	frames;
+	unsigned long		bytes;
+
+	if (cpu_is_at32ap7000())
+		bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
+	else
+		bytes = readl(chip->regs + ATMEL_PDC_RPR);
+	bytes -= runtime->dma_addr;
+
+	frames = bytes_to_frames(runtime, bytes);
+	if (frames >= runtime->buffer_size)
+		frames -= runtime->buffer_size;
+	return frames;
+}
+
+static struct snd_pcm_ops atmel_ac97_playback_ops = {
+	.open		= atmel_ac97c_playback_open,
+	.close		= atmel_ac97c_playback_close,
+	.ioctl		= snd_pcm_lib_ioctl,
+	.hw_params	= atmel_ac97c_playback_hw_params,
+	.hw_free	= atmel_ac97c_playback_hw_free,
+	.prepare	= atmel_ac97c_playback_prepare,
+	.trigger	= atmel_ac97c_playback_trigger,
+	.pointer	= atmel_ac97c_playback_pointer,
+};
+
+static struct snd_pcm_ops atmel_ac97_capture_ops = {
+	.open		= atmel_ac97c_capture_open,
+	.close		= atmel_ac97c_capture_close,
+	.ioctl		= snd_pcm_lib_ioctl,
+	.hw_params	= atmel_ac97c_capture_hw_params,
+	.hw_free	= atmel_ac97c_capture_hw_free,
+	.prepare	= atmel_ac97c_capture_prepare,
+	.trigger	= atmel_ac97c_capture_trigger,
+	.pointer	= atmel_ac97c_capture_pointer,
+};
+
+static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
+{
+	struct atmel_ac97c	*chip  = (struct atmel_ac97c *)dev;
+	irqreturn_t		retval = IRQ_NONE;
+	u32			sr     = ac97c_readl(chip, SR);
+	u32			casr   = ac97c_readl(chip, CASR);
+	u32			cosr   = ac97c_readl(chip, COSR);
+	u32			camr   = ac97c_readl(chip, CAMR);
+
+	if (sr & AC97C_SR_CAEVT) {
+		struct snd_pcm_runtime *runtime;
+		int offset, next_period, block_size;
+		dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
+				casr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
+				casr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
+				casr & AC97C_CSR_UNRUN   ? " UNRUN"   : "",
+				casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
+				casr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
+				!casr                    ? " NONE"    : "");
+		if (!cpu_is_at32ap7000()) {
+			if ((casr & camr) & AC97C_CSR_ENDTX) {
+				runtime = chip->playback_substream->runtime;
+				block_size = frames_to_bytes(runtime,
+						runtime->period_size);
+				chip->playback_period++;
+
+				if (chip->playback_period == runtime->periods)
+					chip->playback_period = 0;
+				next_period = chip->playback_period + 1;
+				if (next_period == runtime->periods)
+					next_period = 0;
+
+				offset = block_size * next_period;
+
+				writel(runtime->dma_addr + offset,
+						chip->regs + ATMEL_PDC_TNPR);
+				writel(block_size / 2,
+						chip->regs + ATMEL_PDC_TNCR);
+
+				snd_pcm_period_elapsed(
+						chip->playback_substream);
+			}
+			if ((casr & camr) & AC97C_CSR_ENDRX) {
+				runtime = chip->capture_substream->runtime;
+				block_size = frames_to_bytes(runtime,
+						runtime->period_size);
+				chip->capture_period++;
+
+				if (chip->capture_period == runtime->periods)
+					chip->capture_period = 0;
+				next_period = chip->capture_period + 1;
+				if (next_period == runtime->periods)
+					next_period = 0;
+
+				offset = block_size * next_period;
+
+				writel(runtime->dma_addr + offset,
+						chip->regs + ATMEL_PDC_RNPR);
+				writel(block_size / 2,
+						chip->regs + ATMEL_PDC_RNCR);
+				snd_pcm_period_elapsed(chip->capture_substream);
+			}
+		}
+		retval = IRQ_HANDLED;
+	}
+
+	if (sr & AC97C_SR_COEVT) {
+		dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
+				cosr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
+				cosr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
+				cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
+				cosr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
+				!cosr                    ? " NONE"    : "");
+		retval = IRQ_HANDLED;
+	}
+
+	if (retval == IRQ_NONE) {
+		dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
+				"casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
+	}
+
+	return retval;
+}
+
+static struct ac97_pcm at91_ac97_pcm_defs[] = {
+	/* Playback */
+	{
+		.exclusive = 1,
+		.r = { {
+			.slots = ((1 << AC97_SLOT_PCM_LEFT)
+				  | (1 << AC97_SLOT_PCM_RIGHT)),
+		} },
+	},
+	/* PCM in */
+	{
+		.stream = 1,
+		.exclusive = 1,
+		.r = { {
+			.slots = ((1 << AC97_SLOT_PCM_LEFT)
+					| (1 << AC97_SLOT_PCM_RIGHT)),
+		} }
+	},
+	/* Mic in */
+	{
+		.stream = 1,
+		.exclusive = 1,
+		.r = { {
+			.slots = (1<<AC97_SLOT_MIC),
+		} }
+	},
+};
+
+static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
+{
+	struct snd_pcm		*pcm;
+	struct snd_pcm_hardware	hw = atmel_ac97c_hw;
+	int			capture, playback, retval, err;
+
+	capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+	playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+
+	if (!cpu_is_at32ap7000()) {
+		err = snd_ac97_pcm_assign(chip->ac97_bus,
+				ARRAY_SIZE(at91_ac97_pcm_defs),
+				at91_ac97_pcm_defs);
+		if (err)
+			return err;
+	}
+	retval = snd_pcm_new(chip->card, chip->card->shortname,
+			0, playback, capture, &pcm);
+	if (retval)
+		return retval;
+
+	if (capture)
+		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
+				&atmel_ac97_capture_ops);
+	if (playback)
+		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+				&atmel_ac97_playback_ops);
+
+	retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+			&chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
+			hw.buffer_bytes_max);
+	if (retval)
+		return retval;
+
+	pcm->private_data = chip;
+	pcm->info_flags = 0;
+	strcpy(pcm->name, chip->card->shortname);
+	chip->pcm = pcm;
+
+	return 0;
+}
+
+static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
+{
+	struct snd_ac97_template template;
+	memset(&template, 0, sizeof(template));
+	template.private_data = chip;
+	return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
+}
+
+static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
+		unsigned short val)
+{
+	struct atmel_ac97c *chip = get_chip(ac97);
+	unsigned long word;
+	int timeout = 40;
+
+	word = (reg & 0x7f) << 16 | val;
+
+	do {
+		if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
+			ac97c_writel(chip, COTHR, word);
+			return;
+		}
+		udelay(1);
+	} while (--timeout);
+
+	dev_dbg(&chip->pdev->dev, "codec write timeout\n");
+}
+
+static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
+		unsigned short reg)
+{
+	struct atmel_ac97c *chip = get_chip(ac97);
+	unsigned long word;
+	int timeout = 40;
+	int write = 10;
+
+	word = (0x80 | (reg & 0x7f)) << 16;
+
+	if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
+		ac97c_readl(chip, CORHR);
+
+retry_write:
+	timeout = 40;
+
+	do {
+		if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
+			ac97c_writel(chip, COTHR, word);
+			goto read_reg;
+		}
+		udelay(10);
+	} while (--timeout);
+
+	if (!--write)
+		goto timed_out;
+	goto retry_write;
+
+read_reg:
+	do {
+		if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
+			unsigned short val = ac97c_readl(chip, CORHR);
+			return val;
+		}
+		udelay(10);
+	} while (--timeout);
+
+	if (!--write)
+		goto timed_out;
+	goto retry_write;
+
+timed_out:
+	dev_dbg(&chip->pdev->dev, "codec read timeout\n");
+	return 0xffff;
+}
+
+static bool filter(struct dma_chan *chan, void *slave)
+{
+	struct dw_dma_slave *dws = slave;
+
+	if (dws->dma_dev == chan->device->dev) {
+		chan->private = dws;
+		return true;
+	} else
+		return false;
+}
+
+static void atmel_ac97c_reset(struct atmel_ac97c *chip)
+{
+	ac97c_writel(chip, MR,   0);
+	ac97c_writel(chip, MR,   AC97C_MR_ENA);
+	ac97c_writel(chip, CAMR, 0);
+	ac97c_writel(chip, COMR, 0);
+
+	if (gpio_is_valid(chip->reset_pin)) {
+		gpio_set_value(chip->reset_pin, 0);
+		/* AC97 v2.2 specifications says minimum 1 us. */
+		udelay(2);
+		gpio_set_value(chip->reset_pin, 1);
+	} else {
+		ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
+		udelay(2);
+		ac97c_writel(chip, MR, AC97C_MR_ENA);
+	}
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id atmel_ac97c_dt_ids[] = {
+	{ .compatible = "atmel,at91sam9263-ac97c", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids);
+
+static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
+{
+	struct ac97c_platform_data *pdata;
+	struct device_node *node = dev->of_node;
+
+	if (!node) {
+		dev_err(dev, "Device does not have associated DT data\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	pdata->reset_pin = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
+
+	return pdata;
+}
+#else
+static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
+{
+	dev_err(dev, "no platform data defined\n");
+	return ERR_PTR(-ENXIO);
+}
+#endif
+
+static int atmel_ac97c_probe(struct platform_device *pdev)
+{
+	struct snd_card			*card;
+	struct atmel_ac97c		*chip;
+	struct resource			*regs;
+	struct ac97c_platform_data	*pdata;
+	struct clk			*pclk;
+	static struct snd_ac97_bus_ops	ops = {
+		.write	= atmel_ac97c_write,
+		.read	= atmel_ac97c_read,
+	};
+	int				retval;
+	int				irq;
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!regs) {
+		dev_dbg(&pdev->dev, "no memory resource\n");
+		return -ENXIO;
+	}
+
+	pdata = dev_get_platdata(&pdev->dev);
+	if (!pdata) {
+		pdata = atmel_ac97c_probe_dt(&pdev->dev);
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_dbg(&pdev->dev, "could not get irq\n");
+		return -ENXIO;
+	}
+
+	if (cpu_is_at32ap7000()) {
+		pclk = clk_get(&pdev->dev, "pclk");
+	} else {
+		pclk = clk_get(&pdev->dev, "ac97_clk");
+	}
+
+	if (IS_ERR(pclk)) {
+		dev_dbg(&pdev->dev, "no peripheral clock\n");
+		return PTR_ERR(pclk);
+	}
+	clk_prepare_enable(pclk);
+
+	retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1,
+			      SNDRV_DEFAULT_STR1, THIS_MODULE,
+			      sizeof(struct atmel_ac97c), &card);
+	if (retval) {
+		dev_dbg(&pdev->dev, "could not create sound card device\n");
+		goto err_snd_card_new;
+	}
+
+	chip = get_chip(card);
+
+	retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
+	if (retval) {
+		dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
+		goto err_request_irq;
+	}
+	chip->irq = irq;
+
+	spin_lock_init(&chip->lock);
+
+	strcpy(card->driver, "Atmel AC97C");
+	strcpy(card->shortname, "Atmel AC97C");
+	sprintf(card->longname, "Atmel AC97 controller");
+
+	chip->card = card;
+	chip->pclk = pclk;
+	chip->pdev = pdev;
+	chip->regs = ioremap(regs->start, resource_size(regs));
+
+	if (!chip->regs) {
+		dev_dbg(&pdev->dev, "could not remap register memory\n");
+		retval = -ENOMEM;
+		goto err_ioremap;
+	}
+
+	if (gpio_is_valid(pdata->reset_pin)) {
+		if (gpio_request(pdata->reset_pin, "reset_pin")) {
+			dev_dbg(&pdev->dev, "reset pin not available\n");
+			chip->reset_pin = -ENODEV;
+		} else {
+			gpio_direction_output(pdata->reset_pin, 1);
+			chip->reset_pin = pdata->reset_pin;
+		}
+	} else {
+		chip->reset_pin = -EINVAL;
+	}
+
+	atmel_ac97c_reset(chip);
+
+	/* Enable overrun interrupt from codec channel */
+	ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
+	ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
+
+	retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
+	if (retval) {
+		dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
+		goto err_ac97_bus;
+	}
+
+	retval = atmel_ac97c_mixer_new(chip);
+	if (retval) {
+		dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
+		goto err_ac97_bus;
+	}
+
+	if (cpu_is_at32ap7000()) {
+		if (pdata->rx_dws.dma_dev) {
+			dma_cap_mask_t mask;
+
+			dma_cap_zero(mask);
+			dma_cap_set(DMA_SLAVE, mask);
+
+			chip->dma.rx_chan = dma_request_channel(mask, filter,
+								&pdata->rx_dws);
+			if (chip->dma.rx_chan) {
+				struct dma_slave_config dma_conf = {
+					.src_addr = regs->start + AC97C_CARHR +
+						2,
+					.src_addr_width =
+						DMA_SLAVE_BUSWIDTH_2_BYTES,
+					.src_maxburst = 1,
+					.dst_maxburst = 1,
+					.direction = DMA_DEV_TO_MEM,
+					.device_fc = false,
+				};
+
+				dmaengine_slave_config(chip->dma.rx_chan,
+						&dma_conf);
+			}
+
+			dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
+				dev_name(&chip->dma.rx_chan->dev->device));
+			set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+		}
+
+		if (pdata->tx_dws.dma_dev) {
+			dma_cap_mask_t mask;
+
+			dma_cap_zero(mask);
+			dma_cap_set(DMA_SLAVE, mask);
+
+			chip->dma.tx_chan = dma_request_channel(mask, filter,
+								&pdata->tx_dws);
+			if (chip->dma.tx_chan) {
+				struct dma_slave_config dma_conf = {
+					.dst_addr = regs->start + AC97C_CATHR +
+						2,
+					.dst_addr_width =
+						DMA_SLAVE_BUSWIDTH_2_BYTES,
+					.src_maxburst = 1,
+					.dst_maxburst = 1,
+					.direction = DMA_MEM_TO_DEV,
+					.device_fc = false,
+				};
+
+				dmaengine_slave_config(chip->dma.tx_chan,
+						&dma_conf);
+			}
+
+			dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
+				dev_name(&chip->dma.tx_chan->dev->device));
+			set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+		}
+
+		if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
+				!test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
+			dev_dbg(&pdev->dev, "DMA not available\n");
+			retval = -ENODEV;
+			goto err_dma;
+		}
+	} else {
+		/* Just pretend that we have DMA channel(for at91 i is actually
+		 * the PDC) */
+		set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+		set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+	}
+
+	retval = atmel_ac97c_pcm_new(chip);
+	if (retval) {
+		dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
+		goto err_dma;
+	}
+
+	retval = snd_card_register(card);
+	if (retval) {
+		dev_dbg(&pdev->dev, "could not register sound card\n");
+		goto err_dma;
+	}
+
+	platform_set_drvdata(pdev, card);
+
+	dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
+			chip->regs, irq);
+
+	return 0;
+
+err_dma:
+	if (cpu_is_at32ap7000()) {
+		if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
+			dma_release_channel(chip->dma.rx_chan);
+		if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
+			dma_release_channel(chip->dma.tx_chan);
+		clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+		clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+		chip->dma.rx_chan = NULL;
+		chip->dma.tx_chan = NULL;
+	}
+err_ac97_bus:
+	if (gpio_is_valid(chip->reset_pin))
+		gpio_free(chip->reset_pin);
+
+	iounmap(chip->regs);
+err_ioremap:
+	free_irq(irq, chip);
+err_request_irq:
+	snd_card_free(card);
+err_snd_card_new:
+	clk_disable_unprepare(pclk);
+	clk_put(pclk);
+	return retval;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int atmel_ac97c_suspend(struct device *pdev)
+{
+	struct snd_card *card = dev_get_drvdata(pdev);
+	struct atmel_ac97c *chip = card->private_data;
+
+	if (cpu_is_at32ap7000()) {
+		if (test_bit(DMA_RX_READY, &chip->flags))
+			dw_dma_cyclic_stop(chip->dma.rx_chan);
+		if (test_bit(DMA_TX_READY, &chip->flags))
+			dw_dma_cyclic_stop(chip->dma.tx_chan);
+	}
+	clk_disable_unprepare(chip->pclk);
+
+	return 0;
+}
+
+static int atmel_ac97c_resume(struct device *pdev)
+{
+	struct snd_card *card = dev_get_drvdata(pdev);
+	struct atmel_ac97c *chip = card->private_data;
+
+	clk_prepare_enable(chip->pclk);
+	if (cpu_is_at32ap7000()) {
+		if (test_bit(DMA_RX_READY, &chip->flags))
+			dw_dma_cyclic_start(chip->dma.rx_chan);
+		if (test_bit(DMA_TX_READY, &chip->flags))
+			dw_dma_cyclic_start(chip->dma.tx_chan);
+	}
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
+#define ATMEL_AC97C_PM_OPS	&atmel_ac97c_pm
+#else
+#define ATMEL_AC97C_PM_OPS	NULL
+#endif
+
+static int atmel_ac97c_remove(struct platform_device *pdev)
+{
+	struct snd_card *card = platform_get_drvdata(pdev);
+	struct atmel_ac97c *chip = get_chip(card);
+
+	if (gpio_is_valid(chip->reset_pin))
+		gpio_free(chip->reset_pin);
+
+	ac97c_writel(chip, CAMR, 0);
+	ac97c_writel(chip, COMR, 0);
+	ac97c_writel(chip, MR,   0);
+
+	clk_disable_unprepare(chip->pclk);
+	clk_put(chip->pclk);
+	iounmap(chip->regs);
+	free_irq(chip->irq, chip);
+
+	if (cpu_is_at32ap7000()) {
+		if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
+			dma_release_channel(chip->dma.rx_chan);
+		if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
+			dma_release_channel(chip->dma.tx_chan);
+		clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+		clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+		chip->dma.rx_chan = NULL;
+		chip->dma.tx_chan = NULL;
+	}
+
+	snd_card_free(card);
+
+	return 0;
+}
+
+static struct platform_driver atmel_ac97c_driver = {
+	.probe		= atmel_ac97c_probe,
+	.remove		= atmel_ac97c_remove,
+	.driver		= {
+		.name	= "atmel_ac97c",
+		.pm	= ATMEL_AC97C_PM_OPS,
+		.of_match_table = of_match_ptr(atmel_ac97c_dt_ids),
+	},
+};
+module_platform_driver(atmel_ac97c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
+MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");