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, 262 insertions, 0 deletions

diff --git a/kernel/sound/oss/pas2_midi.c b/kernel/sound/oss/pas2_midi.c
new file mode 100644
index 000000000..1122d10a2
--- /dev/null
+++ b/kernel/sound/oss/pas2_midi.c
@@ -0,0 +1,262 @@
+/*
+ * sound/oss/pas2_midi.c
+ *
+ * The low level driver for the PAS Midi Interface.
+ */
+/*
+ * Copyright (C) by Hannu Savolainen 1993-1997
+ *
+ * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
+ * Version 2 (June 1991). See the "COPYING" file distributed with this software
+ * for more info.
+ *
+ * Bartlomiej Zolnierkiewicz	: Added __init to pas_init_mixer()
+ */
+
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include "sound_config.h"
+
+#include "pas2.h"
+
+extern spinlock_t pas_lock;
+
+static int      midi_busy, input_opened;
+static int      my_dev;
+
+int pas2_mididev=-1;
+
+static unsigned char tmp_queue[256];
+static volatile int qlen;
+static volatile unsigned char qhead, qtail;
+
+static void     (*midi_input_intr) (int dev, unsigned char data);
+
+static int pas_midi_open(int dev, int mode,
+	      void            (*input) (int dev, unsigned char data),
+	      void            (*output) (int dev)
+)
+{
+	int             err;
+	unsigned long   flags;
+	unsigned char   ctrl;
+
+
+	if (midi_busy)
+		return -EBUSY;
+
+	/*
+	 * Reset input and output FIFO pointers
+	 */
+	pas_write(0x20 | 0x40,
+		  0x178b);
+
+	spin_lock_irqsave(&pas_lock, flags);
+
+	if ((err = pas_set_intr(0x10)) < 0)
+	{
+		spin_unlock_irqrestore(&pas_lock, flags);
+		return err;
+	}
+	/*
+	 * Enable input available and output FIFO empty interrupts
+	 */
+
+	ctrl = 0;
+	input_opened = 0;
+	midi_input_intr = input;
+
+	if (mode == OPEN_READ || mode == OPEN_READWRITE)
+	{
+		ctrl |= 0x04;	/* Enable input */
+		input_opened = 1;
+	}
+	if (mode == OPEN_WRITE || mode == OPEN_READWRITE)
+	{
+		ctrl |= 0x08 | 0x10;	/* Enable output */
+	}
+	pas_write(ctrl, 0x178b);
+
+	/*
+	 * Acknowledge any pending interrupts
+	 */
+
+	pas_write(0xff, 0x1B88);
+
+	spin_unlock_irqrestore(&pas_lock, flags);
+
+	midi_busy = 1;
+	qlen = qhead = qtail = 0;
+	return 0;
+}
+
+static void pas_midi_close(int dev)
+{
+
+	/*
+	 * Reset FIFO pointers, disable intrs
+	 */
+	pas_write(0x20 | 0x40, 0x178b);
+
+	pas_remove_intr(0x10);
+	midi_busy = 0;
+}
+
+static int dump_to_midi(unsigned char midi_byte)
+{
+	int fifo_space, x;
+
+	fifo_space = ((x = pas_read(0x1B89)) >> 4) & 0x0f;
+
+	/*
+	 * The MIDI FIFO space register and it's documentation is nonunderstandable.
+	 * There seem to be no way to differentiate between buffer full and buffer
+	 * empty situations. For this reason we don't never write the buffer
+	 * completely full. In this way we can assume that 0 (or is it 15)
+	 * means that the buffer is empty.
+	 */
+
+	if (fifo_space < 2 && fifo_space != 0)	/* Full (almost) */
+		return 0;	/* Ask upper layers to retry after some time */
+
+	pas_write(midi_byte, 0x178A);
+
+	return 1;
+}
+
+static int pas_midi_out(int dev, unsigned char midi_byte)
+{
+
+	unsigned long flags;
+
+	/*
+	 * Drain the local queue first
+	 */
+
+	spin_lock_irqsave(&pas_lock, flags);
+
+	while (qlen && dump_to_midi(tmp_queue[qhead]))
+	{
+		qlen--;
+		qhead++;
+	}
+
+	spin_unlock_irqrestore(&pas_lock, flags);
+
+	/*
+	 *	Output the byte if the local queue is empty.
+	 */
+
+	if (!qlen)
+		if (dump_to_midi(midi_byte))
+			return 1;
+
+	/*
+	 *	Put to the local queue
+	 */
+
+	if (qlen >= 256)
+		return 0;	/* Local queue full */
+
+	spin_lock_irqsave(&pas_lock, flags);
+
+	tmp_queue[qtail] = midi_byte;
+	qlen++;
+	qtail++;
+
+	spin_unlock_irqrestore(&pas_lock, flags);
+
+	return 1;
+}
+
+static int pas_midi_start_read(int dev)
+{
+	return 0;
+}
+
+static int pas_midi_end_read(int dev)
+{
+	return 0;
+}
+
+static void pas_midi_kick(int dev)
+{
+}
+
+static int pas_buffer_status(int dev)
+{
+	return qlen;
+}
+
+#define MIDI_SYNTH_NAME	"Pro Audio Spectrum Midi"
+#define MIDI_SYNTH_CAPS	SYNTH_CAP_INPUT
+#include "midi_synth.h"
+
+static struct midi_operations pas_midi_operations =
+{
+	.owner		= THIS_MODULE,
+	.info		= {"Pro Audio Spectrum", 0, 0, SNDCARD_PAS},
+	.converter	= &std_midi_synth,
+	.in_info	= {0},
+	.open		= pas_midi_open,
+	.close		= pas_midi_close,
+	.outputc	= pas_midi_out,
+	.start_read	= pas_midi_start_read,
+	.end_read	= pas_midi_end_read,
+	.kick		= pas_midi_kick,
+	.buffer_status	= pas_buffer_status,
+};
+
+void __init pas_midi_init(void)
+{
+	int dev = sound_alloc_mididev();
+
+	if (dev == -1)
+	{
+		printk(KERN_WARNING "pas_midi_init: Too many midi devices detected\n");
+		return;
+	}
+	std_midi_synth.midi_dev = my_dev = dev;
+	midi_devs[dev] = &pas_midi_operations;
+	pas2_mididev = dev;
+	sequencer_init();
+}
+
+void pas_midi_interrupt(void)
+{
+	unsigned char   stat;
+	int             i, incount;
+
+	stat = pas_read(0x1B88);
+
+	if (stat & 0x04)	/* Input data available */
+	{
+		incount = pas_read(0x1B89) & 0x0f;	/* Input FIFO size */
+		if (!incount)
+			incount = 16;
+
+		for (i = 0; i < incount; i++)
+			if (input_opened)
+			{
+				midi_input_intr(my_dev, pas_read(0x178A));
+			} else
+				pas_read(0x178A);	/* Flush */
+	}
+	if (stat & (0x08 | 0x10))
+	{
+		spin_lock(&pas_lock);/* called in irq context */
+
+		while (qlen && dump_to_midi(tmp_queue[qhead]))
+		{
+			qlen--;
+			qhead++;
+		}
+
+		spin_unlock(&pas_lock);
+	}
+	if (stat & 0x40)
+	{
+		printk(KERN_WARNING "MIDI output overrun %x,%x\n", pas_read(0x1B89), stat);
+	}
+	pas_write(stat, 0x1B88);	/* Acknowledge interrupts */
+}