Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-linus-1

* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6: (9356 commits)
  [media] rc: update for bitop name changes
  fs: simplify iget & friends
  fs: pull inode->i_lock up out of writeback_single_inode
  fs: rename inode_lock to inode_hash_lock
  fs: move i_wb_list out from under inode_lock
  fs: move i_sb_list out from under inode_lock
  fs: remove inode_lock from iput_final and prune_icache
  fs: Lock the inode LRU list separately
  fs: factor inode disposal
  fs: protect inode->i_state with inode->i_lock
  lib, arch: add filter argument to show_mem and fix private implementations
  SLUB: Write to per cpu data when allocating it
  slub: Fix debugobjects with lockless fastpath
  autofs4: Do not potentially dereference NULL pointer returned by fget() in autofs_dev_ioctl_setpipefd()
  autofs4 - remove autofs4_lock
  autofs4 - fix d_manage() return on rcu-walk
  autofs4 - fix autofs4_expire_indirect() traversal
  autofs4 - fix dentry leak in autofs4_expire_direct()
  autofs4 - reinstate last used update on access
  vfs - check non-mountpoint dentry might block in __follow_mount_rcu()
  ...

NOTE!

This merge commit was created to fix compilation error. The block
tree was merged upstream and removed the 'elv_queue_empty()'
function which the new 'mtdswap' driver is using. So a simple
merge of the mtd tree with upstream does not compile. And the
mtd tree has already be published, so re-basing it is not an option.

To fix this unfortunate situation, I had to merge upstream into the
mtd-2.6.git tree without committing, put the fixup patch on top of
this, and then commit this. The result is that we do not have commits
which do not compile.

In other words, this merge commit "merges" 3 things: the MTD tree, the
upstream tree, and the fixup patch.

1 files changed, 404 insertions, 0 deletions

diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c
new file mode 100644
index 000000000000..3c271f953582
--- /dev/null
+++ b/sound/soc/tegra/tegra_pcm.c
@@ -0,0 +1,404 @@
+/*
+ * tegra_pcm.c - Tegra PCM driver
+ *
+ * Author: Stephen Warren <swarren@nvidia.com>
+ * Copyright (C) 2010 - NVIDIA, Inc.
+ *
+ * Based on code copyright/by:
+ *
+ * Copyright (c) 2009-2010, NVIDIA Corporation.
+ * Scott Peterson <speterson@nvidia.com>
+ * Vijay Mali <vmali@nvidia.com>
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Iliyan Malchev <malchev@google.com>
+ *
+ * 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.
+ *
+ * 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 St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "tegra_pcm.h"
+
+#define DRV_NAME "tegra-pcm-audio"
+
+static const struct snd_pcm_hardware tegra_pcm_hardware = {
+	.info			= SNDRV_PCM_INFO_MMAP |
+				  SNDRV_PCM_INFO_MMAP_VALID |
+				  SNDRV_PCM_INFO_PAUSE |
+				  SNDRV_PCM_INFO_RESUME |
+				  SNDRV_PCM_INFO_INTERLEAVED,
+	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
+	.channels_min		= 2,
+	.channels_max		= 2,
+	.period_bytes_min	= 1024,
+	.period_bytes_max	= PAGE_SIZE,
+	.periods_min		= 2,
+	.periods_max		= 8,
+	.buffer_bytes_max	= PAGE_SIZE * 8,
+	.fifo_size		= 4,
+};
+
+static void tegra_pcm_queue_dma(struct tegra_runtime_data *prtd)
+{
+	struct snd_pcm_substream *substream = prtd->substream;
+	struct snd_dma_buffer *buf = &substream->dma_buffer;
+	struct tegra_dma_req *dma_req;
+	unsigned long addr;
+
+	dma_req = &prtd->dma_req[prtd->dma_req_idx];
+	prtd->dma_req_idx = 1 - prtd->dma_req_idx;
+
+	addr = buf->addr + prtd->dma_pos;
+	prtd->dma_pos += dma_req->size;
+	if (prtd->dma_pos >= prtd->dma_pos_end)
+		prtd->dma_pos = 0;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		dma_req->source_addr = addr;
+	else
+		dma_req->dest_addr = addr;
+
+	tegra_dma_enqueue_req(prtd->dma_chan, dma_req);
+}
+
+static void dma_complete_callback(struct tegra_dma_req *req)
+{
+	struct tegra_runtime_data *prtd = (struct tegra_runtime_data *)req->dev;
+	struct snd_pcm_substream *substream = prtd->substream;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	spin_lock(&prtd->lock);
+
+	if (!prtd->running) {
+		spin_unlock(&prtd->lock);
+		return;
+	}
+
+	if (++prtd->period_index >= runtime->periods)
+		prtd->period_index = 0;
+
+	tegra_pcm_queue_dma(prtd);
+
+	spin_unlock(&prtd->lock);
+
+	snd_pcm_period_elapsed(substream);
+}
+
+static void setup_dma_tx_request(struct tegra_dma_req *req,
+					struct tegra_pcm_dma_params * dmap)
+{
+	req->complete = dma_complete_callback;
+	req->to_memory = false;
+	req->dest_addr = dmap->addr;
+	req->dest_wrap = dmap->wrap;
+	req->source_bus_width = 32;
+	req->source_wrap = 0;
+	req->dest_bus_width = dmap->width;
+	req->req_sel = dmap->req_sel;
+}
+
+static void setup_dma_rx_request(struct tegra_dma_req *req,
+					struct tegra_pcm_dma_params * dmap)
+{
+	req->complete = dma_complete_callback;
+	req->to_memory = true;
+	req->source_addr = dmap->addr;
+	req->dest_wrap = 0;
+	req->source_bus_width = dmap->width;
+	req->source_wrap = dmap->wrap;
+	req->dest_bus_width = 32;
+	req->req_sel = dmap->req_sel;
+}
+
+static int tegra_pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct tegra_runtime_data *prtd;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct tegra_pcm_dma_params * dmap;
+	int ret = 0;
+
+	prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL);
+	if (prtd == NULL)
+		return -ENOMEM;
+
+	runtime->private_data = prtd;
+	prtd->substream = substream;
+
+	spin_lock_init(&prtd->lock);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+		setup_dma_tx_request(&prtd->dma_req[0], dmap);
+		setup_dma_tx_request(&prtd->dma_req[1], dmap);
+	} else {
+		dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+		setup_dma_rx_request(&prtd->dma_req[0], dmap);
+		setup_dma_rx_request(&prtd->dma_req[1], dmap);
+	}
+
+	prtd->dma_req[0].dev = prtd;
+	prtd->dma_req[1].dev = prtd;
+
+	prtd->dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT);
+	if (prtd->dma_chan == NULL) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	/* Set HW params now that initialization is complete */
+	snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
+
+	/* Ensure that buffer size is a multiple of period size */
+	ret = snd_pcm_hw_constraint_integer(runtime,
+						SNDRV_PCM_HW_PARAM_PERIODS);
+	if (ret < 0)
+		goto err;
+
+	return 0;
+
+err:
+	if (prtd->dma_chan) {
+		tegra_dma_free_channel(prtd->dma_chan);
+	}
+
+	kfree(prtd);
+
+	return ret;
+}
+
+static int tegra_pcm_close(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct tegra_runtime_data *prtd = runtime->private_data;
+
+	tegra_dma_free_channel(prtd->dma_chan);
+
+	kfree(prtd);
+
+	return 0;
+}
+
+static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct tegra_runtime_data *prtd = runtime->private_data;
+
+	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+	prtd->dma_req[0].size = params_period_bytes(params);
+	prtd->dma_req[1].size = prtd->dma_req[0].size;
+
+	return 0;
+}
+
+static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+	snd_pcm_set_runtime_buffer(substream, NULL);
+
+	return 0;
+}
+
+static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct tegra_runtime_data *prtd = runtime->private_data;
+	unsigned long flags;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		prtd->dma_pos = 0;
+		prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size);
+		prtd->period_index = 0;
+		prtd->dma_req_idx = 0;
+		/* Fall-through */
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		spin_lock_irqsave(&prtd->lock, flags);
+		prtd->running = 1;
+		spin_unlock_irqrestore(&prtd->lock, flags);
+		tegra_pcm_queue_dma(prtd);
+		tegra_pcm_queue_dma(prtd);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		spin_lock_irqsave(&prtd->lock, flags);
+		prtd->running = 0;
+		spin_unlock_irqrestore(&prtd->lock, flags);
+		tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]);
+		tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct tegra_runtime_data *prtd = runtime->private_data;
+
+	return prtd->period_index * runtime->period_size;
+}
+
+
+static int tegra_pcm_mmap(struct snd_pcm_substream *substream,
+				struct vm_area_struct *vma)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+					runtime->dma_area,
+					runtime->dma_addr,
+					runtime->dma_bytes);
+}
+
+static struct snd_pcm_ops tegra_pcm_ops = {
+	.open		= tegra_pcm_open,
+	.close		= tegra_pcm_close,
+	.ioctl		= snd_pcm_lib_ioctl,
+	.hw_params	= tegra_pcm_hw_params,
+	.hw_free	= tegra_pcm_hw_free,
+	.trigger	= tegra_pcm_trigger,
+	.pointer	= tegra_pcm_pointer,
+	.mmap		= tegra_pcm_mmap,
+};
+
+static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+	struct snd_dma_buffer *buf = &substream->dma_buffer;
+	size_t size = tegra_pcm_hardware.buffer_bytes_max;
+
+	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+						&buf->addr, GFP_KERNEL);
+	if (!buf->area)
+		return -ENOMEM;
+
+	buf->dev.type = SNDRV_DMA_TYPE_DEV;
+	buf->dev.dev = pcm->card->dev;
+	buf->private_data = NULL;
+	buf->bytes = size;
+
+	return 0;
+}
+
+static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+	struct snd_dma_buffer *buf = &substream->dma_buffer;
+
+	if (!buf->area)
+		return;
+
+	dma_free_writecombine(pcm->card->dev, buf->bytes,
+				buf->area, buf->addr);
+	buf->area = NULL;
+}
+
+static u64 tegra_dma_mask = DMA_BIT_MASK(32);
+
+static int tegra_pcm_new(struct snd_card *card,
+				struct snd_soc_dai *dai, struct snd_pcm *pcm)
+{
+	int ret = 0;
+
+	if (!card->dev->dma_mask)
+		card->dev->dma_mask = &tegra_dma_mask;
+	if (!card->dev->coherent_dma_mask)
+		card->dev->coherent_dma_mask = 0xffffffff;
+
+	if (dai->driver->playback.channels_min) {
+		ret = tegra_pcm_preallocate_dma_buffer(pcm,
+						SNDRV_PCM_STREAM_PLAYBACK);
+		if (ret)
+			goto err;
+	}
+
+	if (dai->driver->capture.channels_min) {
+		ret = tegra_pcm_preallocate_dma_buffer(pcm,
+						SNDRV_PCM_STREAM_CAPTURE);
+		if (ret)
+			goto err_free_play;
+	}
+
+	return 0;
+
+err_free_play:
+	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
+err:
+	return ret;
+}
+
+static void tegra_pcm_free(struct snd_pcm *pcm)
+{
+	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
+	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
+}
+
+struct snd_soc_platform_driver tegra_pcm_platform = {
+	.ops		= &tegra_pcm_ops,
+	.pcm_new	= tegra_pcm_new,
+	.pcm_free	= tegra_pcm_free,
+};
+
+static int __devinit tegra_pcm_platform_probe(struct platform_device *pdev)
+{
+	return snd_soc_register_platform(&pdev->dev, &tegra_pcm_platform);
+}
+
+static int __devexit tegra_pcm_platform_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_platform(&pdev->dev);
+	return 0;
+}
+
+static struct platform_driver tegra_pcm_driver = {
+	.driver = {
+		.name = DRV_NAME,
+		.owner = THIS_MODULE,
+	},
+	.probe = tegra_pcm_platform_probe,
+	.remove = __devexit_p(tegra_pcm_platform_remove),
+};
+
+static int __init snd_tegra_pcm_init(void)
+{
+	return platform_driver_register(&tegra_pcm_driver);
+}
+module_init(snd_tegra_pcm_init);
+
+static void __exit snd_tegra_pcm_exit(void)
+{
+	platform_driver_unregister(&tegra_pcm_driver);
+}
+module_exit(snd_tegra_pcm_exit);
+
+MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
+MODULE_DESCRIPTION("Tegra PCM ASoC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);