Revert "[ARM] tegra: driver for spdif audio"

This reverts commit 3543d53703c5a1ed0b987c77e7a79226c3a24f45.

Signed-off-by: Iliyan Malchev <malchev@google.com>

1 files changed, 0 insertions, 1326 deletions

diff --git a/arch/arm/mach-tegra/tegra_spdif_audio.c b/arch/arm/mach-tegra/tegra_spdif_audio.c
deleted file mode 100644
index ff182079863e..000000000000
--- a/arch/arm/mach-tegra/tegra_spdif_audio.c
+++ /dev/null
@@ -1,1326 +0,0 @@
-/*
- * arch/arm/mach-tegra/tegra_spdif_audio.c
- *
- * S/PDIF audio driver for NVIDIA Tegra SoCs
- *
- * Copyright (c) 2008-2009, NVIDIA Corporation.
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/miscdevice.h>
-#include <linux/fs.h>
-#include <linux/mutex.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-#include <linux/spinlock.h>
-#include <linux/uaccess.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmapool.h>
-#include <linux/err.h>
-#include <linux/spi/spi.h>
-#include <linux/kfifo.h>
-#include <linux/debugfs.h>
-#include <linux/completion.h>
-#include <linux/platform_device.h>
-#include <linux/device.h>
-#include <linux/io.h>
-#include <linux/ktime.h>
-#include <linux/sysfs.h>
-
-#include <linux/tegra_audio.h>
-
-#include <mach/dma.h>
-#include <mach/iomap.h>
-#include <mach/spdif.h>
-#include <mach/audio.h>
-#include <mach/irqs.h>
-
-#include "clock.h"
-
-
-/* per stream (input/output) */
-struct audio_stream {
-	int opened;
-	struct mutex lock;
-
-	struct tegra_audio_buf_config buf_config;
-	bool active; /* is DMA or PIO in progress? */
-	void *buffer;
-	dma_addr_t buf_phys;
-	struct kfifo fifo;
-	struct completion fifo_completion;
-
-	unsigned errors;
-
-	int spdif_fifo_atn_level;
-
-	ktime_t last_dma_ts;
-	struct tegra_dma_channel *dma_chan;
-	struct completion stop_completion;
-	spinlock_t dma_req_lock; /* guards dma_has_it */
-	int dma_has_it;
-	struct tegra_dma_req dma_req;
-};
-
-struct spdif_pio_stats {
-	u32 spdif_interrupt_count;
-	u32 tx_fifo_errors;
-	u32 tx_fifo_written;
-};
-
-
-struct audio_driver_state {
-	struct list_head next;
-
-	struct platform_device *pdev;
-	struct tegra_audio_platform_data *pdata;
-	phys_addr_t spdif_phys;
-	unsigned long spdif_base;
-
-	bool using_dma;
-	unsigned long dma_req_sel;
-
-	int irq; /* for pio mode */
-	struct spdif_pio_stats pio_stats;
-	const int *in_divs;
-	int in_divs_len;
-
-	struct miscdevice misc_out;
-	struct miscdevice misc_out_ctl;
-	struct audio_stream out;
-};
-
-static inline int buf_size(struct audio_stream *s)
-{
-	return 1 << s->buf_config.size;
-}
-
-static inline int chunk_size(struct audio_stream *s)
-{
-	return 1 << s->buf_config.chunk;
-}
-
-static inline int threshold_size(struct audio_stream *s)
-{
-	return 1 << s->buf_config.threshold;
-}
-
-static inline struct audio_driver_state *ads_from_misc_out(struct file *file)
-{
-	struct miscdevice *m = file->private_data;
-	struct audio_driver_state *ads =
-			container_of(m, struct audio_driver_state, misc_out);
-	BUG_ON(!ads);
-	return ads;
-}
-
-static inline struct audio_driver_state *ads_from_misc_out_ctl(
-		struct file *file)
-{
-	struct miscdevice *m = file->private_data;
-	struct audio_driver_state *ads =
-			container_of(m, struct audio_driver_state,
-					misc_out_ctl);
-	BUG_ON(!ads);
-	return ads;
-}
-
-static inline struct audio_driver_state *ads_from_out(
-			struct audio_stream *aos)
-{
-	return container_of(aos, struct audio_driver_state, out);
-}
-
-static inline void spdif_writel(unsigned long base, u32 val, u32 reg)
-{
-	writel(val, base + reg);
-}
-
-static inline u32 spdif_readl(unsigned long base, u32 reg)
-{
-	return readl(base + reg);
-}
-
-static inline void spdif_fifo_write(unsigned long base, u32 data)
-{
-	spdif_writel(base, data, SPDIF_DATA_OUT_0);
-}
-
-static int spdif_fifo_set_attention_level(unsigned long base,
-			unsigned level)
-{
-	u32 val;
-
-	if (level > SPDIF_FIFO_ATN_LVL_TWELVE_SLOTS) {
-		pr_err("%s: invalid fifo level selector %d\n", __func__,
-			level);
-		return -EINVAL;
-	}
-
-	val = spdif_readl(base, SPDIF_DATA_FIFO_CSR_0);
-
-	val &= ~SPDIF_DATA_FIFO_CSR_0_TX_ATN_LVL_MASK;
-	val |= level << SPDIF_DATA_FIFO_CSR_0_TX_ATN_LVL_SHIFT;
-
-
-	spdif_writel(base, val, SPDIF_DATA_FIFO_CSR_0);
-	return 0;
-}
-
-static void spdif_fifo_enable(unsigned long base, int on)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	val &= ~(SPDIF_CTRL_0_TX_EN | SPDIF_CTRL_0_TC_EN);
-	val |= on ? (SPDIF_CTRL_0_TX_EN) : 0;
-	val |= on ? (SPDIF_CTRL_0_TC_EN) : 0;
-
-	spdif_writel(base, val, SPDIF_CTRL_0);
-}
-
-static bool spdif_is_fifo_enabled(unsigned long base)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	return !!(val & SPDIF_CTRL_0_TX_EN);
-}
-
-static void spdif_fifo_clear(unsigned long base)
-{
-	u32 val = spdif_readl(base, SPDIF_DATA_FIFO_CSR_0);
-	val &= ~(SPDIF_DATA_FIFO_CSR_0_TX_CLR | SPDIF_DATA_FIFO_CSR_0_TU_CLR);
-	val |= SPDIF_DATA_FIFO_CSR_0_TX_CLR | SPDIF_DATA_FIFO_CSR_0_TU_CLR;
-	spdif_writel(base, val, SPDIF_DATA_FIFO_CSR_0);
-}
-
-
-static int spdif_set_bit_mode(unsigned long base, unsigned mode)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	val &= ~SPDIF_CTRL_0_BIT_MODE_MASK;
-
-	if (mode > SPDIF_BIT_MODE_MODERAW) {
-		pr_err("%s: invalid bit_size selector %d\n", __func__,
-			mode);
-		return -EINVAL;
-	}
-
-	val |= mode << SPDIF_CTRL_0_BIT_MODE_SHIFT;
-
-	spdif_writel(base, val, SPDIF_CTRL_0);
-	return 0;
-}
-
-static int spdif_set_fifo_packed(unsigned long base, unsigned on)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	val &= ~SPDIF_CTRL_0_PACK;
-	val |= on ? SPDIF_CTRL_0_PACK : 0;
-	spdif_writel(base, val, SPDIF_CTRL_0);
-	return 0;
-}
-
-
-static void spdif_set_fifo_irq_on_err(unsigned long base, int on)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	val &= ~SPDIF_CTRL_0_IE_TXE;
-	val |= on ? SPDIF_CTRL_0_IE_TXE : 0;
-	spdif_writel(base, val, SPDIF_CTRL_0);
-}
-
-
-
-static void spdif_enable_fifos(unsigned long base, int on)
-{
-	u32 val = spdif_readl(base, SPDIF_CTRL_0);
-	if (on)
-		val |= SPDIF_CTRL_0_TX_EN | SPDIF_CTRL_0_TC_EN |
-		       SPDIF_CTRL_0_IE_TXE;
-	else
-		val &= ~(SPDIF_CTRL_0_TX_EN | SPDIF_CTRL_0_TC_EN |
-			 SPDIF_CTRL_0_IE_TXE);
-
-	spdif_writel(base, val, SPDIF_CTRL_0);
-}
-
-static inline u32 spdif_get_status(unsigned long base)
-{
-	return spdif_readl(base, SPDIF_STATUS_0);
-}
-
-static inline u32 spdif_get_control(unsigned long base)
-{
-	return spdif_readl(base, SPDIF_CTRL_0);
-}
-
-static inline void spdif_ack_status(unsigned long base)
-{
-	return spdif_writel(base, spdif_readl(base, SPDIF_STATUS_0),
-				SPDIF_STATUS_0);
-}
-
-static inline u32 spdif_get_fifo_scr(unsigned long base)
-{
-	return spdif_readl(base, SPDIF_DATA_FIFO_CSR_0);
-}
-
-static inline phys_addr_t spdif_get_fifo_phy_base(unsigned long phy_base)
-{
-	return phy_base + SPDIF_DATA_OUT_0;
-}
-
-static inline u32 spdif_get_fifo_full_empty_count(unsigned long base)
-{
-	u32 val = spdif_readl(base, SPDIF_DATA_FIFO_CSR_0);
-	val = val >> SPDIF_DATA_FIFO_CSR_0_TD_EMPTY_COUNT_SHIFT;
-	return val & SPDIF_DATA_FIFO_CSR_0_TD_EMPTY_COUNT_MASK;
-}
-
-
-static int spdif_set_sample_rate(struct audio_driver_state *state,
-				unsigned int sample_rate)
-{
-	unsigned int clock_freq = 0;
-	unsigned int parent_clock_freq = 0;
-	struct clk *spdif_clk;
-
-	unsigned int ch_sta[] = {
-		0x0, /* 44.1, default values */
-		0xf << 4, /* bits 36-39, original sample freq -- 44.1 */
-		0x0,
-		0x0,
-		0x0,
-		0x0,
-	};
-
-	ch_sta[0] = 0x0;
-	ch_sta[1] = 0xf << 4;
-
-	switch (sample_rate) {
-	case 32000:
-		clock_freq = 4096000; /* 4.0960 MHz */
-		parent_clock_freq = 12288000;
-		ch_sta[0] = 0x3 << 24;
-		ch_sta[1] = 0xC << 4;
-		break;
-	case 44100:
-		clock_freq = 5644800; /* 5.6448 MHz */
-		parent_clock_freq = 11289600;
-		ch_sta[0] = 0x0;
-		ch_sta[1] = 0xF << 4;
-		break;
-	case 48000:
-		clock_freq = 6144000; /* 6.1440MHz */
-		parent_clock_freq = 12288000;
-		ch_sta[0] = 0x2 << 24;
-		ch_sta[1] = 0xD << 4;
-		break;
-	case 88200:
-		clock_freq = 11289600; /* 11.2896 MHz */
-		parent_clock_freq = 11289600;
-		break;
-	case 96000:
-		clock_freq = 12288000; /* 12.288 MHz */
-		parent_clock_freq = 12288000;
-		break;
-	case 176400:
-		clock_freq = 22579200; /* 22.5792 MHz */
-		parent_clock_freq = 11289600;
-		break;
-	case 192000:
-		clock_freq = 24576000; /* 24.5760 MHz */
-		parent_clock_freq = 12288000;
-		break;
-	default:
-		return -1;
-	}
-
-	spdif_clk = clk_get(&state->pdev->dev, NULL);
-	if (!spdif_clk) {
-		dev_err(&state->pdev->dev, "%s: could not get spdif clock\n",
-			__func__);
-		return -EIO;
-	}
-
-	clk_set_rate(spdif_clk, clock_freq);
-	if (clk_enable(spdif_clk)) {
-		dev_err(&state->pdev->dev, "%s: failed to enable spdif_clk"\
-			" clock\n", __func__);
-		return -EIO;
-	}
-	pr_info("%s: spdif_clk rate %ld\n", __func__, clk_get_rate(spdif_clk));
-
-	spdif_writel(state->spdif_base, ch_sta[0], SPDIF_CH_STA_TX_A_0);
-	spdif_writel(state->spdif_base, ch_sta[1], SPDIF_CH_STA_TX_B_0);
-	spdif_writel(state->spdif_base, ch_sta[2], SPDIF_CH_STA_TX_C_0);
-	spdif_writel(state->spdif_base, ch_sta[3], SPDIF_CH_STA_TX_D_0);
-	spdif_writel(state->spdif_base, ch_sta[4], SPDIF_CH_STA_TX_E_0);
-	spdif_writel(state->spdif_base, ch_sta[5], SPDIF_CH_STA_TX_F_0);
-
-	return 0;
-}
-
-
-#define PCM_IN_BUFFER_PADDING		(1<<6) /* bytes */
-#define PCM_BUFFER_MAX_SIZE_ORDER	(PAGE_SHIFT + 2)
-#define PCM_BUFFER_DMA_CHUNK_SIZE_ORDER	(PCM_BUFFER_MAX_SIZE_ORDER - 1)
-#define PCM_BUFFER_THRESHOLD_ORDER	PCM_BUFFER_DMA_CHUNK_SIZE_ORDER
-#define PCM_DMA_CHUNK_MIN_SIZE_ORDER	3
-
-static int init_stream_buffer(struct audio_stream *,
-		struct tegra_audio_buf_config *cfg, unsigned);
-
-static int setup_dma(struct audio_driver_state *);
-static void tear_down_dma(struct audio_driver_state *);
-static int start_dma_playback(struct audio_stream *);
-static void stop_dma_playback(struct audio_stream *);
-
-static int setup_pio(struct audio_driver_state *);
-static void tear_down_pio(struct audio_driver_state *);
-static int start_pio_playback(struct audio_stream *);
-static void stop_pio_playback(struct audio_stream *);
-
-
-struct sound_ops {
-	int (*setup)(struct audio_driver_state *);
-	void (*tear_down)(struct audio_driver_state *);
-	int (*start_playback)(struct audio_stream *);
-	void (*stop_playback)(struct audio_stream *);
-};
-
-static const struct sound_ops dma_sound_ops = {
-	.setup = setup_dma,
-	.tear_down = tear_down_dma,
-	.start_playback = start_dma_playback,
-	.stop_playback = stop_dma_playback,
-};
-
-static const struct sound_ops pio_sound_ops = {
-	.setup = setup_pio,
-	.tear_down = tear_down_pio,
-	.start_playback = start_pio_playback,
-	.stop_playback = stop_pio_playback,
-};
-
-static const struct sound_ops *sound_ops = &dma_sound_ops;
-
-static int start_playback(struct audio_stream *aos)
-{
-	int rc;
-	unsigned long flags;
-	spin_lock_irqsave(&aos->dma_req_lock, flags);
-	pr_debug("%s: starting playback\n", __func__);
-	rc = sound_ops->start_playback(aos);
-	spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-	return rc;
-}
-
-
-static bool stop_playback_if_necessary(struct audio_stream *aos)
-{
-	unsigned long flags;
-	spin_lock_irqsave(&aos->dma_req_lock, flags);
-	if (kfifo_is_empty(&aos->fifo)) {
-		sound_ops->stop_playback(aos);
-		if (aos->active)
-			aos->errors++;
-		spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-		return true;
-	}
-	spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-
-	return false;
-}
-
-
-static void toggle_dma(struct audio_driver_state *ads)
-{
-	pr_info("%s: %s\n", __func__, ads->using_dma ? "pio" : "dma");
-	sound_ops->tear_down(ads);
-	sound_ops = ads->using_dma ? &pio_sound_ops : &dma_sound_ops;
-	sound_ops->setup(ads);
-	ads->using_dma = !ads->using_dma;
-}
-
-/* DMA */
-
-static int resume_dma_playback(struct audio_stream *aos);
-
-static void setup_dma_tx_request(struct tegra_dma_req *req,
-		struct audio_stream *aos);
-
-static int setup_dma(struct audio_driver_state *ads)
-{
-	int rc;
-	pr_info("%s\n", __func__);
-
-	/* setup audio playback */
-	ads->out.buf_phys = dma_map_single(&ads->pdev->dev, ads->out.buffer,
-				1 << PCM_BUFFER_MAX_SIZE_ORDER, DMA_TO_DEVICE);
-	BUG_ON(!ads->out.buf_phys);
-	setup_dma_tx_request(&ads->out.dma_req, &ads->out);
-	ads->out.dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT);
-	if (!ads->out.dma_chan) {
-		pr_err("%s: could not allocate output SPDIF DMA channel: %ld\n",
-			__func__, PTR_ERR(ads->out.dma_chan));
-		rc = -ENODEV;
-		goto fail_tx;
-	}
-	return 0;
-
-
-fail_tx:
-	dma_unmap_single(&ads->pdev->dev, ads->out.buf_phys,
-			1 << PCM_BUFFER_MAX_SIZE_ORDER, DMA_TO_DEVICE);
-	tegra_dma_free_channel(ads->out.dma_chan);
-	ads->out.dma_chan = 0;
-
-	return rc;
-}
-
-static void tear_down_dma(struct audio_driver_state *ads)
-{
-	pr_info("%s\n", __func__);
-
-	tegra_dma_free_channel(ads->out.dma_chan);
-	ads->out.dma_chan = NULL;
-	dma_unmap_single(&ads->pdev->dev, ads->out.buf_phys,
-				buf_size(&ads->out),
-				DMA_TO_DEVICE);
-	ads->out.buf_phys = 0;
-
-}
-
-static void dma_tx_complete_callback(struct tegra_dma_req *req)
-{
-	unsigned long flags;
-	struct audio_stream *aos = req->dev;
-	int count = req->bytes_transferred;
-	u64 delta_us;
-	u64 max_delay_us = count * 10000 / (4 * 441);
-
-	pr_debug("%s bytes transferred %d\n", __func__, count);
-
-	aos->dma_has_it = false;
-	delta_us = ktime_to_us(ktime_sub(ktime_get_real(), aos->last_dma_ts));
-
-	if (delta_us > max_delay_us) {
-		pr_debug("%s: too late by %lld us\n", __func__,
-			delta_us - max_delay_us);
-		aos->errors++;
-	}
-
-	kfifo_skip(&aos->fifo, count);
-
-	if (kfifo_avail(&aos->fifo) >= threshold_size(aos) &&
-			!completion_done(&aos->fifo_completion)) {
-		pr_debug("%s: complete (%d avail)\n", __func__,
-				kfifo_avail(&aos->fifo));
-		complete(&aos->fifo_completion);
-	}
-
-	if (stop_playback_if_necessary(aos))
-		return;
-	spin_lock_irqsave(&aos->dma_req_lock, flags);
-	resume_dma_playback(aos);
-	spin_unlock_irqrestore(&aos->dma_req_lock, flags);
-}
-
-static void setup_dma_tx_request(struct tegra_dma_req *req,
-		struct audio_stream *aos)
-{
-	struct audio_driver_state *ads = ads_from_out(aos);
-
-	memset(req, 0, sizeof(*req));
-
-	req->complete = dma_tx_complete_callback;
-	req->dev = aos;
-	req->to_memory = false;
-	req->dest_addr = spdif_get_fifo_phy_base(ads->spdif_phys);
-	req->dest_wrap = 4;
-	req->dest_bus_width = 16;
-	req->source_bus_width = 32;
-	req->source_wrap = 0;
-	req->req_sel = ads->dma_req_sel;
-}
-
-
-/* Called with aos->dma_req_lock taken. */
-static int resume_dma_playback(struct audio_stream *aos)
-{
-	int rc;
-	struct audio_driver_state *ads = ads_from_out(aos);
-	struct tegra_dma_req *req = &aos->dma_req;
-
-	unsigned out, in;
-
-	out = __kfifo_off(&aos->fifo, aos->fifo.out);
-	in = __kfifo_off(&aos->fifo, aos->fifo.in);
-
-	/* stop_playback_if_necessary() already checks to see if the fifo is
-	 * empty.
-	 */
-	BUG_ON(!kfifo_len(&aos->fifo));
-
-	if (aos->dma_has_it) {
-		pr_debug("%s: playback already in progress\n", __func__);
-		return 0;
-	}
-
-#if 0
-	spdif_fifo_clear(ads->spdif_base);
-#endif
-	spdif_fifo_set_attention_level(ads->spdif_base,
-			aos->spdif_fifo_atn_level);
-
-	req->source_addr = aos->buf_phys + out;
-	if (out < in)
-		req->size = in - out;
-	else
-		req->size = kfifo_size(&aos->fifo) - out;
-
-	dma_sync_single_for_device(NULL,
-			aos->buf_phys + out, req->size, DMA_TO_DEVICE);
-
-	/* Don't send all the data yet. */
-	if (req->size > chunk_size(aos))
-		req->size = chunk_size(aos);
-	pr_debug("%s resume playback (%d in fifo, writing %d, in %d out %d)\n",
-			__func__, kfifo_len(&aos->fifo), req->size, in, out);
-
-	spdif_fifo_enable(ads->spdif_base, 1);
-
-	aos->last_dma_ts = ktime_get_real();
-	rc = tegra_dma_enqueue_req(aos->dma_chan, req);
-	aos->dma_has_it = !rc;
-	if (!aos->dma_has_it)
-		pr_err("%s: could not enqueue TX DMA req\n", __func__);
-	return rc;
-}
-
-/* Called with aos->dma_req_lock taken. */
-static int start_dma_playback(struct audio_stream *aos)
-{
-	return resume_dma_playback(aos);
-}
-
-/* Called with aos->dma_req_lock taken. */
-static void stop_dma_playback(struct audio_stream *aos)
-{
-	int spin = 0;
-	struct audio_driver_state *ads = ads_from_out(aos);
-	pr_debug("%s\n", __func__);
-	spdif_fifo_enable(ads->spdif_base, 0);
-	while ((spdif_get_status(ads->spdif_base) & SPDIF_STATUS_0_TX_BSY) &&
-			spin < 100)
-		if (spin++ > 50)
-			pr_info("%s: spin %d\n", __func__, spin);
-	if (spin == 100)
-		pr_warn("%s: spinny\n", __func__);
-}
-
-/* PIO (non-DMA) */
-
-static int setup_pio(struct audio_driver_state *ads)
-{
-	pr_info("%s\n", __func__);
-	enable_irq(ads->irq);
-	return 0;
-}
-
-static void tear_down_pio(struct audio_driver_state *ads)
-{
-	pr_info("%s\n", __func__);
-	disable_irq(ads->irq);
-}
-
-static int start_pio_playback(struct audio_stream *aos)
-{
-	struct audio_driver_state *ads = ads_from_out(aos);
-
-	if (spdif_is_fifo_enabled(ads->spdif_base)) {
-		pr_debug("%s: playback is already in progress\n", __func__);
-		return 0;
-	}
-
-	pr_debug("%s\n", __func__);
-
-	spdif_fifo_set_attention_level(ads->spdif_base,
-			aos->spdif_fifo_atn_level);
-#if 0
-	spdif_fifo_clear(ads->spdif_base);
-#endif
-
-	spdif_set_fifo_irq_on_err(ads->spdif_base, 1);
-	spdif_fifo_enable(ads->spdif_base, 1);
-
-	return 0;
-}
-
-static void stop_pio_playback(struct audio_stream *aos)
-{
-	struct audio_driver_state *ads = ads_from_out(aos);
-
-	spdif_set_fifo_irq_on_err(ads->spdif_base, 0);
-	spdif_fifo_enable(ads->spdif_base, 0);
-	while (spdif_get_status(ads->spdif_base) & SPDIF_STATUS_0_TX_BSY)
-		/* spin */;
-
-	pr_info("%s: interrupts %d\n", __func__,
-			ads->pio_stats.spdif_interrupt_count);
-	pr_info("%s: sent       %d\n", __func__,
-			ads->pio_stats.tx_fifo_written);
-	pr_info("%s: tx errors  %d\n", __func__,
-			ads->pio_stats.tx_fifo_errors);
-
-	memset(&ads->pio_stats, 0, sizeof(ads->pio_stats));
-}
-
-
-static irqreturn_t spdif_interrupt(int irq, void *data)
-{
-	struct audio_driver_state *ads = data;
-	u32 status = spdif_get_status(ads->spdif_base);
-
-	pr_debug("%s: %08x\n", __func__, status);
-
-	ads->pio_stats.spdif_interrupt_count++;
-
-	if (status & SPDIF_CTRL_0_IE_TXE)
-		ads->pio_stats.tx_fifo_errors++;
-
-#if 0
-	if (status & SPDIF_STATUS_0_TX_ERR)
-#endif
-		spdif_ack_status(ads->spdif_base);
-
-	if (status & SPDIF_STATUS_0_QS_TX) {
-		int written;
-		int empty;
-		int len;
-		u16 fifo_buffer[32];
-
-		struct audio_stream *out = &ads->out;
-
-		if (!spdif_is_fifo_enabled(ads->spdif_base)) {
-			pr_debug("%s: tx fifo not enabled, skipping\n",
-				__func__);
-			goto done;
-		}
-
-		pr_debug("%s tx fifo is ready\n", __func__);
-
-		if (kfifo_avail(&out->fifo) > threshold_size(out) &&
-				!completion_done(&out->fifo_completion)) {
-			pr_debug("%s: tx complete (%d avail)\n", __func__,
-					kfifo_avail(&out->fifo));
-			complete(&out->fifo_completion);
-		}
-
-		if (stop_playback_if_necessary(out))
-			goto done;
-
-		empty = spdif_get_fifo_full_empty_count(ads->spdif_base);
-
-		len = kfifo_out(&out->fifo, fifo_buffer,
-				empty * sizeof(u16));
-		len /= sizeof(u16);
-
-		written = 0;
-		while (empty-- && written < len) {
-			ads->pio_stats.tx_fifo_written += written * sizeof(u16);
-			spdif_fifo_write(ads->spdif_base,
-					fifo_buffer[written++]);
-		}
-
-		/* TODO: Should we check to see if we wrote less than the
-		 * FIFO threshold and adjust it if so?
-		 */
-
-		if (written) {
-			/* start the transaction */
-			pr_debug("%s: enabling fifo (%d samples written)\n",
-					__func__, written);
-			spdif_fifo_enable(ads->spdif_base, 1);
-		}
-	}
-
-done:
-	pr_debug("%s: done %08x\n", __func__,
-			spdif_get_status(ads->spdif_base));
-	return IRQ_HANDLED;
-}
-
-static ssize_t tegra_spdif_write(struct file *file,
-		const char __user *buf, size_t size, loff_t *off)
-{
-	ssize_t rc, total = 0;
-	unsigned nw = 0;
-
-	struct audio_driver_state *ads = ads_from_misc_out(file);
-
-	mutex_lock(&ads->out.lock);
-
-	ads->out.active = true;
-
-	if (!IS_ALIGNED(size, 4)) {
-		pr_err("%s: user size request %d not aligned to 4\n",
-			__func__, size);
-		rc = -EINVAL;
-		goto done;
-	}
-
-	pr_debug("%s: write %d bytes, %d available\n", __func__,
-			size, kfifo_avail(&ads->out.fifo));
-
-again:
-	rc = kfifo_from_user(&ads->out.fifo, buf + total, size - total, &nw);
-	if (rc < 0) {
-		pr_err("%s: error copying from user\n", __func__);
-		goto done;
-	}
-
-	rc = start_playback(&ads->out);
-	if (rc < 0) {
-		pr_err("%s: could not start playback: %d\n", __func__, rc);
-		goto done;
-	}
-
-	total += nw;
-	if (total < size) {
-		pr_debug("%s: sleep (user %d total %d nw %d)\n", __func__,
-				size, total, nw);
-		mutex_unlock(&ads->out.lock);
-		rc = wait_for_completion_interruptible(
-				&ads->out.fifo_completion);
-		mutex_lock(&ads->out.lock);
-		if (rc == -ERESTARTSYS) {
-			pr_warn("%s: interrupted\n", __func__);
-			goto done;
-		}
-		pr_debug("%s: awake\n", __func__);
-		goto again;
-	}
-
-	rc = total;
-	*off += total;
-
-done:
-	ads->out.active = false;
-	mutex_unlock(&ads->out.lock);
-	return rc;
-}
-
-static long tegra_spdif_out_ioctl(struct file *file,
-			unsigned int cmd, unsigned long arg)
-{
-	int rc = 0;
-	struct audio_driver_state *ads = ads_from_misc_out_ctl(file);
-	struct audio_stream *aos = &ads->out;
-
-	mutex_lock(&aos->lock);
-
-	switch (cmd) {
-	case TEGRA_AUDIO_OUT_SET_BUF_CONFIG: {
-		struct tegra_audio_buf_config cfg;
-		if (copy_from_user(&cfg, (void __user *)arg, sizeof(cfg))) {
-			rc = -EFAULT;
-			break;
-		}
-		if (aos->active) {
-			pr_err("%s: playback in progress\n", __func__);
-			rc = -EBUSY;
-			break;
-		}
-		rc = init_stream_buffer(aos, &cfg, 0);
-		if (rc < 0)
-			break;
-		aos->buf_config = cfg;
-	}
-		break;
-	case TEGRA_AUDIO_OUT_GET_BUF_CONFIG:
-		if (copy_to_user((void __user *)arg, &aos->buf_config,
-				sizeof(aos->buf_config)))
-			rc = -EFAULT;
-		break;
-	case TEGRA_AUDIO_OUT_GET_ERROR_COUNT:
-		if (copy_to_user((void __user *)arg, &aos->errors,
-				sizeof(aos->errors)))
-			rc = -EFAULT;
-		if (!rc)
-			aos->errors = 0;
-		break;
-	case TEGRA_AUDIO_OUT_PRELOAD_FIFO: {
-		struct tegra_audio_out_preload preload;
-		if (copy_from_user(&preload, (void __user *)arg,
-				sizeof(preload))) {
-			rc = -EFAULT;
-			break;
-		}
-		rc = kfifo_from_user(&ads->out.fifo,
-				(void __user *)preload.data, preload.len,
-				&preload.len_written);
-		if (rc < 0) {
-			pr_err("%s: error copying from user\n", __func__);
-			break;
-		}
-		if (copy_to_user((void __user *)arg, &preload, sizeof(preload)))
-			rc = -EFAULT;
-		pr_info("%s: preloaded output fifo with %d bytes\n", __func__,
-			preload.len_written);
-	}
-		break;
-	default:
-		rc = -EINVAL;
-	}
-
-	mutex_unlock(&aos->lock);
-	return rc;
-}
-
-
-
-static int tegra_spdif_out_open(struct inode *inode, struct file *file)
-{
-	int rc = 0;
-	struct audio_driver_state *ads = ads_from_misc_out(file);
-
-	pr_info("%s\n", __func__);
-
-	mutex_lock(&ads->out.lock);
-	if (!ads->out.opened++) {
-		pr_info("%s: resetting fifo and error count\n", __func__);
-		ads->out.errors = 0;
-		kfifo_reset(&ads->out.fifo);
-	}
-	rc = spdif_set_sample_rate(ads, 44100);
-
-	mutex_unlock(&ads->out.lock);
-
-	return rc;
-}
-
-static int tegra_spdif_out_release(struct inode *inode, struct file *file)
-{
-	struct audio_driver_state *ads = ads_from_misc_out(file);
-	struct clk *spdif_clk;
-
-	pr_info("%s\n", __func__);
-
-	mutex_lock(&ads->out.lock);
-	if (ads->out.opened)
-		ads->out.opened--;
-	if (!ads->out.opened)
-		stop_playback_if_necessary(&ads->out);
-
-	spdif_clk = clk_get(&ads->pdev->dev, NULL);
-	if (!spdif_clk) {
-		dev_err(&ads->pdev->dev, "%s: could not get spdif clock\n",
-			__func__);
-		return -EIO;
-	}
-	clk_disable(spdif_clk);
-	mutex_unlock(&ads->out.lock);
-
-	return 0;
-}
-
-static const struct file_operations tegra_spdif_out_fops = {
-	.owner = THIS_MODULE,
-	.open = tegra_spdif_out_open,
-	.release = tegra_spdif_out_release,
-	.write = tegra_spdif_write,
-};
-
-static int tegra_spdif_ctl_open(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-static int tegra_spdif_ctl_release(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-static const struct file_operations tegra_spdif_out_ctl_fops = {
-	.owner = THIS_MODULE,
-	.open = tegra_spdif_ctl_open,
-	.release = tegra_spdif_ctl_release,
-	.unlocked_ioctl = tegra_spdif_out_ioctl,
-};
-
-static int init_stream_buffer(struct audio_stream *s,
-				struct tegra_audio_buf_config *cfg,
-				unsigned padding)
-{
-	pr_info("%s (size %d threshold %d chunk %d)\n", __func__,
-		cfg->size, cfg->threshold, cfg->chunk);
-
-	if (cfg->chunk < PCM_DMA_CHUNK_MIN_SIZE_ORDER) {
-		pr_err("%s: chunk %d too small (%d min)\n", __func__,
-			cfg->chunk, PCM_DMA_CHUNK_MIN_SIZE_ORDER);
-		return -EINVAL;
-	}
-
-	if (cfg->chunk > cfg->size) {
-		pr_err("%s: chunk %d > size %d\n", __func__,
-				cfg->chunk, cfg->size);
-		return -EINVAL;
-	}
-
-	if (cfg->threshold > cfg->size) {
-		pr_err("%s: threshold %d > size %d\n", __func__,
-				cfg->threshold, cfg->size);
-		return -EINVAL;
-	}
-
-	if ((1 << cfg->size) < padding) {
-		pr_err("%s: size %d < buffer padding %d (bytes)\n", __func__,
-			cfg->size, padding);
-		return -EINVAL;
-	}
-
-	if (cfg->size > PCM_BUFFER_MAX_SIZE_ORDER) {
-		pr_err("%s: size %d exceeds max %d\n", __func__,
-			cfg->size, PCM_BUFFER_MAX_SIZE_ORDER);
-		return -EINVAL;
-	}
-
-	if (!s->buffer) {
-		pr_debug("%s: allocating buffer (size %d, padding %d)\n",
-				__func__, 1 << cfg->size, padding);
-		s->buffer = kmalloc((1 << cfg->size) + padding,
-				GFP_KERNEL | GFP_DMA);
-	}
-	if (!s->buffer) {
-		pr_err("%s: could not allocate output buffer\n", __func__);
-		return -ENOMEM;
-	}
-
-	kfifo_init(&s->fifo, s->buffer, 1 << cfg->size);
-	return 0;
-}
-
-
-static int setup_misc_device(struct miscdevice *misc,
-			const struct file_operations  *fops,
-			const char *fmt, ...)
-{
-	int rc = 0;
-	va_list args;
-	const int sz = 64;
-
-	va_start(args, fmt);
-
-	memset(misc, 0, sizeof(*misc));
-	misc->minor = MISC_DYNAMIC_MINOR;
-	misc->name  = kmalloc(sz, GFP_KERNEL);
-	if (!misc->name) {
-		rc = -ENOMEM;
-		goto done;
-	}
-
-	vsnprintf((char *)misc->name, sz, fmt, args);
-	misc->fops = fops;
-	if (misc_register(misc)) {
-		pr_err("%s: could not register %s\n", __func__, misc->name);
-		kfree(misc->name);
-		rc = -EIO;
-		goto done;
-	}
-
-done:
-	va_end(args);
-	return rc;
-}
-
-static ssize_t dma_toggle_show(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	struct tegra_audio_platform_data *pdata = dev->platform_data;
-	struct audio_driver_state *ads = pdata->driver_data;
-	return sprintf(buf, "%s\n", ads->using_dma ? "dma" : "pio");
-}
-
-static ssize_t dma_toggle_store(struct device *dev,
-			struct device_attribute *attr,
-			const char *buf, size_t count)
-{
-	int use_dma;
-	struct tegra_audio_platform_data *pdata = dev->platform_data;
-	struct audio_driver_state *ads = pdata->driver_data;
-
-	if (count < 4)
-		return -EINVAL;
-
-	use_dma = 0;
-	if (!strncmp(buf, "dma", 3))
-		use_dma = 1;
-	else if (strncmp(buf, "pio", 3)) {
-		dev_err(dev, "%s: invalid string [%s]\n", __func__, buf);
-		return -EINVAL;
-	}
-
-	mutex_lock(&ads->out.lock);
-	if (ads->out.active) {
-		dev_err(dev, "%s: playback or recording in progress.\n",
-			__func__);
-		mutex_unlock(&ads->out.lock);
-		return -EBUSY;
-	}
-	if (!!use_dma ^ !!ads->using_dma)
-		toggle_dma(ads);
-	else
-		dev_info(dev, "%s: no change\n", __func__);
-	mutex_unlock(&ads->out.lock);
-
-	return count;
-}
-
-static DEVICE_ATTR(dma_toggle, 0644, dma_toggle_show, dma_toggle_store);
-
-static ssize_t __attr_fifo_atn_read(char *buf, int atn_lvl)
-{
-	switch (atn_lvl) {
-	case SPDIF_FIFO_ATN_LVL_ONE_SLOT:
-		strncpy(buf, "1\n", 2);
-		return 2;
-	case SPDIF_FIFO_ATN_LVL_FOUR_SLOTS:
-		strncpy(buf, "4\n", 2);
-		return 2;
-	case SPDIF_FIFO_ATN_LVL_EIGHT_SLOTS:
-		strncpy(buf, "8\n", 2);
-		return 2;
-	case SPDIF_FIFO_ATN_LVL_TWELVE_SLOTS:
-		strncpy(buf, "12\n", 3);
-		return 3;
-	default:
-		BUG_ON(1);
-		return -EIO;
-	}
-}
-
-static ssize_t __attr_fifo_atn_write(struct audio_driver_state *ads,
-		struct audio_stream *as,
-		int *fifo_lvl,
-		const char *buf, size_t size)
-{
-	int lvl;
-
-	if (size > 3) {
-		pr_err("%s: buffer size %d too big\n", __func__, size);
-		return -EINVAL;
-	}
-
-	if (sscanf(buf, "%d", &lvl) != 1) {
-		pr_err("%s: invalid input string [%s]\n", __func__, buf);
-		return -EINVAL;
-	}
-
-	switch (lvl) {
-	case 1:
-		lvl = SPDIF_FIFO_ATN_LVL_ONE_SLOT;
-		break;
-	case 4:
-		lvl = SPDIF_FIFO_ATN_LVL_FOUR_SLOTS;
-		break;
-	case 8:
-		lvl = SPDIF_FIFO_ATN_LVL_EIGHT_SLOTS;
-		break;
-	case 12:
-		lvl = SPDIF_FIFO_ATN_LVL_TWELVE_SLOTS;
-		break;
-	default:
-		pr_err("%s: invalid attention level %d\n", __func__, lvl);
-		return -EINVAL;
-	}
-
-	mutex_lock(&as->lock);
-	if (as->active) {
-		pr_err("%s: in progress.\n", __func__);
-		mutex_unlock(&as->lock);
-		return -EBUSY;
-	}
-	*fifo_lvl = lvl;
-	pr_info("%s: fifo level %d\n", __func__, *fifo_lvl);
-	mutex_unlock(&as->lock);
-
-	return size;
-}
-
-static ssize_t tx_fifo_atn_show(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	struct tegra_audio_platform_data *pdata = dev->platform_data;
-	struct audio_driver_state *ads = pdata->driver_data;
-	return __attr_fifo_atn_read(buf, ads->out.spdif_fifo_atn_level);
-}
-
-static ssize_t tx_fifo_atn_store(struct device *dev,
-			struct device_attribute *attr,
-			const char *buf, size_t count)
-{
-	struct tegra_audio_platform_data *pdata = dev->platform_data;
-	struct audio_driver_state *ads = pdata->driver_data;
-	return __attr_fifo_atn_write(ads, &ads->out,
-			&ads->out.spdif_fifo_atn_level, buf, count);
-}
-
-static DEVICE_ATTR(tx_fifo_atn, 0644, tx_fifo_atn_show, tx_fifo_atn_store);
-
-
-static int tegra_spdif_probe(struct platform_device *pdev)
-{
-	int rc;
-	struct resource *res;
-	struct audio_driver_state *state;
-
-	pr_info("%s\n", __func__);
-
-	state = kzalloc(sizeof(*state), GFP_KERNEL);
-	if (!state)
-		return -ENOMEM;
-
-	state->pdev = pdev;
-	state->pdata = pdev->dev.platform_data;
-	state->pdata->driver_data = state;
-	BUG_ON(!state->pdata);
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no mem resource!\n");
-		return -ENODEV;
-	}
-
-	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
-		dev_err(&pdev->dev, "memory region already claimed!\n");
-		return -ENOMEM;
-	}
-
-	state->spdif_phys = res->start;
-	state->spdif_base = (unsigned long)ioremap(res->start,
-			res->end - res->start + 1);
-	if (!state->spdif_base) {
-		dev_err(&pdev->dev, "cannot remap iomem!\n");
-		return -EIO;
-	}
-
-	state->out.spdif_fifo_atn_level = SPDIF_FIFO_ATN_LVL_FOUR_SLOTS;
-
-	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no dma resource!\n");
-		return -ENODEV;
-	}
-	state->dma_req_sel = res->start;
-
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no irq resource!\n");
-		return -ENODEV;
-	}
-	state->irq = res->start;
-
-	memset(&state->pio_stats, 0, sizeof(state->pio_stats));
-
-	/* disable interrupts from SPDIF */
-	spdif_fifo_clear(state->spdif_base);
-	spdif_enable_fifos(state->spdif_base, 0);
-
-	spdif_set_bit_mode(state->spdif_base, state->pdata->mode);
-	spdif_set_fifo_packed(state->spdif_base, state->pdata->fifo_fmt);
-
-	state->out.opened = 0;
-	state->out.active = false;
-	mutex_init(&state->out.lock);
-	init_completion(&state->out.fifo_completion);
-	init_completion(&state->out.stop_completion);
-	spin_lock_init(&state->out.dma_req_lock);
-	state->out.buf_phys = 0;
-	state->out.dma_chan = NULL;
-	state->out.dma_has_it = false;
-
-	state->out.buffer = 0;
-	state->out.buf_config.size = PCM_BUFFER_MAX_SIZE_ORDER;
-	state->out.buf_config.threshold = PCM_BUFFER_THRESHOLD_ORDER;
-	state->out.buf_config.chunk = PCM_BUFFER_DMA_CHUNK_SIZE_ORDER;
-	rc = init_stream_buffer(&state->out, &state->out.buf_config, 0);
-	if (rc < 0)
-		return rc;
-
-	if (request_irq(state->irq, spdif_interrupt,
-			IRQF_DISABLED, state->pdev->name, state) < 0) {
-		dev_err(&pdev->dev,
-			"%s: could not register handler for irq %d\n",
-			__func__, state->irq);
-		return -EIO;
-	}
-
-	rc = setup_misc_device(&state->misc_out,
-			&tegra_spdif_out_fops,
-			"spdif_out");
-	if (rc < 0)
-		return rc;
-
-	rc = setup_misc_device(&state->misc_out_ctl,
-			&tegra_spdif_out_ctl_fops,
-			"spdif_out_ctl");
-	if (rc < 0)
-		return rc;
-
-
-	state->using_dma = state->pdata->dma_on;
-	if (!state->using_dma)
-		sound_ops = &pio_sound_ops;
-	sound_ops->setup(state);
-
-	rc = device_create_file(&pdev->dev, &dev_attr_dma_toggle);
-	if (rc < 0) {
-		dev_err(&pdev->dev, "%s: could not create sysfs entry %s: %d\n",
-			__func__, dev_attr_dma_toggle.attr.name, rc);
-		return rc;
-	}
-
-	rc = device_create_file(&pdev->dev, &dev_attr_tx_fifo_atn);
-	if (rc < 0) {
-		dev_err(&pdev->dev, "%s: could not create sysfs entry %s: %d\n",
-			__func__, dev_attr_tx_fifo_atn.attr.name, rc);
-		return rc;
-	}
-
-	return 0;
-}
-
-static struct platform_driver tegra_spdif_driver = {
-	.driver = {
-		.name = "spdif_out",
-		.owner = THIS_MODULE,
-	},
-	.probe = tegra_spdif_probe,
-};
-
-static int __init tegra_spdif_init(void)
-{
-	return platform_driver_register(&tegra_spdif_driver);
-}
-
-module_init(tegra_spdif_init);
-MODULE_LICENSE("GPL");