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, 333 insertions, 0 deletions

diff --git a/kernel/sound/soc/nuc900/nuc900-pcm.c b/kernel/sound/soc/nuc900/nuc900-pcm.c
new file mode 100644
index 000000000..5ae5ca15b
--- /dev/null
+++ b/kernel/sound/soc/nuc900/nuc900-pcm.c
@@ -0,0 +1,333 @@
+/*
+ * Copyright (c) 2010 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * 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;version 2 of the License.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <mach/hardware.h>
+
+#include "nuc900-audio.h"
+
+static const struct snd_pcm_hardware nuc900_pcm_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,
+	.buffer_bytes_max	= 4*1024,
+	.period_bytes_min	= 1*1024,
+	.period_bytes_max	= 4*1024,
+	.periods_min		= 1,
+	.periods_max		= 1024,
+};
+
+static int nuc900_dma_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
+}
+
+static void nuc900_update_dma_register(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct nuc900_audio *nuc900_audio = runtime->private_data;
+	void __iomem *mmio_addr, *mmio_len;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		mmio_addr = nuc900_audio->mmio + ACTL_PDSTB;
+		mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH;
+	} else {
+		mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
+		mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
+	}
+
+	AUDIO_WRITE(mmio_addr, runtime->dma_addr);
+	AUDIO_WRITE(mmio_len, runtime->dma_bytes);
+}
+
+static void nuc900_dma_start(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct nuc900_audio *nuc900_audio = runtime->private_data;
+	unsigned long val;
+
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
+	val |= (T_DMA_IRQ | R_DMA_IRQ);
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
+}
+
+static void nuc900_dma_stop(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct nuc900_audio *nuc900_audio = runtime->private_data;
+	unsigned long val;
+
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
+	val &= ~(T_DMA_IRQ | R_DMA_IRQ);
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
+}
+
+static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
+{
+	struct snd_pcm_substream *substream = dev_id;
+	struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
+	unsigned long val;
+
+	spin_lock(&nuc900_audio->lock);
+
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
+
+	if (val & R_DMA_IRQ) {
+		AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);
+
+		val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
+
+		if (val & R_DMA_MIDDLE_IRQ) {
+			val |= R_DMA_MIDDLE_IRQ;
+			AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
+		}
+
+		if (val & R_DMA_END_IRQ) {
+			val |= R_DMA_END_IRQ;
+			AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
+		}
+	} else if (val & T_DMA_IRQ) {
+		AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);
+
+		val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
+
+		if (val & P_DMA_MIDDLE_IRQ) {
+			val |= P_DMA_MIDDLE_IRQ;
+			AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
+		}
+
+		if (val & P_DMA_END_IRQ) {
+			val |= P_DMA_END_IRQ;
+			AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
+		}
+	} else {
+		dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
+		spin_unlock(&nuc900_audio->lock);
+		return IRQ_HANDLED;
+	}
+
+	spin_unlock(&nuc900_audio->lock);
+
+	snd_pcm_period_elapsed(substream);
+
+	return IRQ_HANDLED;
+}
+
+static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
+{
+	snd_pcm_lib_free_pages(substream);
+	return 0;
+}
+
+static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct nuc900_audio *nuc900_audio = runtime->private_data;
+	unsigned long flags, val;
+	int ret = 0;
+
+	spin_lock_irqsave(&nuc900_audio->lock, flags);
+
+	nuc900_update_dma_register(substream);
+
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+
+	switch (runtime->channels) {
+	case 1:
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
+			val |= PLAY_RIGHT_CHNNEL;
+		} else {
+			val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
+			val |= RECORD_RIGHT_CHNNEL;
+		}
+		AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+		break;
+	case 2:
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
+		else
+			val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
+		AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	spin_unlock_irqrestore(&nuc900_audio->lock, flags);
+	return ret;
+}
+
+static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		nuc900_dma_start(substream);
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		nuc900_dma_stop(substream);
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int nuc900_dma_getposition(struct snd_pcm_substream *substream,
+					dma_addr_t *src, dma_addr_t *dst)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct nuc900_audio *nuc900_audio = runtime->private_data;
+
+	if (src != NULL)
+		*src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
+
+	if (dst != NULL)
+		*dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
+
+	return 0;
+}
+
+static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	dma_addr_t src, dst;
+	unsigned long res;
+
+	nuc900_dma_getposition(substream, &src, &dst);
+
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+		res = dst - runtime->dma_addr;
+	else
+		res = src - runtime->dma_addr;
+
+	return bytes_to_frames(substream->runtime, res);
+}
+
+static int nuc900_dma_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct nuc900_audio *nuc900_audio;
+
+	snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
+
+	nuc900_audio = nuc900_ac97_data;
+
+	if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
+			0, "nuc900-dma", substream))
+		return -EBUSY;
+
+	runtime->private_data = nuc900_audio;
+
+	return 0;
+}
+
+static int nuc900_dma_close(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct nuc900_audio *nuc900_audio = runtime->private_data;
+
+	free_irq(nuc900_audio->irq_num, substream);
+
+	return 0;
+}
+
+static int nuc900_dma_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 nuc900_dma_ops = {
+	.open		= nuc900_dma_open,
+	.close		= nuc900_dma_close,
+	.ioctl		= snd_pcm_lib_ioctl,
+	.hw_params	= nuc900_dma_hw_params,
+	.hw_free	= nuc900_dma_hw_free,
+	.prepare	= nuc900_dma_prepare,
+	.trigger	= nuc900_dma_trigger,
+	.pointer	= nuc900_dma_pointer,
+	.mmap		= nuc900_dma_mmap,
+};
+
+static int nuc900_dma_new(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_card *card = rtd->card->snd_card;
+	struct snd_pcm *pcm = rtd->pcm;
+	int ret;
+
+	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
+
+	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+		card->dev, 4 * 1024, (4 * 1024) - 1);
+
+	return 0;
+}
+
+static struct snd_soc_platform_driver nuc900_soc_platform = {
+	.ops		= &nuc900_dma_ops,
+	.pcm_new	= nuc900_dma_new,
+};
+
+static int nuc900_soc_platform_probe(struct platform_device *pdev)
+{
+	return snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform);
+}
+
+static int nuc900_soc_platform_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_platform(&pdev->dev);
+	return 0;
+}
+
+static struct platform_driver nuc900_pcm_driver = {
+	.driver = {
+			.name = "nuc900-pcm-audio",
+	},
+
+	.probe = nuc900_soc_platform_probe,
+	.remove = nuc900_soc_platform_remove,
+};
+
+module_platform_driver(nuc900_pcm_driver);
+
+MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
+MODULE_DESCRIPTION("nuc900 Audio DMA module");
+MODULE_LICENSE("GPL");