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, 91 insertions, 0 deletions

diff --git a/kernel/arch/mips/pci/pci-tx4927.c b/kernel/arch/mips/pci/pci-tx4927.c
new file mode 100644
index 000000000..a032ae0a5
--- /dev/null
+++ b/kernel/arch/mips/pci/pci-tx4927.c
@@ -0,0 +1,91 @@
+/*
+ * Based on linux/arch/mips/txx9/rbtx4938/setup.c,
+ *	    and RBTX49xx patch from CELF patch archive.
+ *
+ * Copyright 2001, 2003-2005 MontaVista Software Inc.
+ * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
+ * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <asm/txx9/generic.h>
+#include <asm/txx9/tx4927.h>
+
+int __init tx4927_report_pciclk(void)
+{
+	int pciclk = 0;
+
+	printk(KERN_INFO "PCIC --%s PCICLK:",
+	       (__raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_PCI66) ?
+	       " PCI66" : "");
+	if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) {
+		u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg);
+		switch ((unsigned long)ccfg &
+			TX4927_CCFG_PCIDIVMODE_MASK) {
+		case TX4927_CCFG_PCIDIVMODE_2_5:
+			pciclk = txx9_cpu_clock * 2 / 5; break;
+		case TX4927_CCFG_PCIDIVMODE_3:
+			pciclk = txx9_cpu_clock / 3; break;
+		case TX4927_CCFG_PCIDIVMODE_5:
+			pciclk = txx9_cpu_clock / 5; break;
+		case TX4927_CCFG_PCIDIVMODE_6:
+			pciclk = txx9_cpu_clock / 6; break;
+		}
+		printk("Internal(%u.%uMHz)",
+		       (pciclk + 50000) / 1000000,
+		       ((pciclk + 50000) / 100000) % 10);
+	} else {
+		printk("External");
+		pciclk = -1;
+	}
+	printk("\n");
+	return pciclk;
+}
+
+int __init tx4927_pciclk66_setup(void)
+{
+	int pciclk;
+
+	/* Assert M66EN */
+	tx4927_ccfg_set(TX4927_CCFG_PCI66);
+	/* Double PCICLK (if possible) */
+	if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) {
+		unsigned int pcidivmode = 0;
+		u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg);
+		pcidivmode = (unsigned long)ccfg &
+			TX4927_CCFG_PCIDIVMODE_MASK;
+		switch (pcidivmode) {
+		case TX4927_CCFG_PCIDIVMODE_5:
+		case TX4927_CCFG_PCIDIVMODE_2_5:
+			pcidivmode = TX4927_CCFG_PCIDIVMODE_2_5;
+			pciclk = txx9_cpu_clock * 2 / 5;
+			break;
+		case TX4927_CCFG_PCIDIVMODE_6:
+		case TX4927_CCFG_PCIDIVMODE_3:
+		default:
+			pcidivmode = TX4927_CCFG_PCIDIVMODE_3;
+			pciclk = txx9_cpu_clock / 3;
+		}
+		tx4927_ccfg_change(TX4927_CCFG_PCIDIVMODE_MASK,
+				   pcidivmode);
+		printk(KERN_DEBUG "PCICLK: ccfg:%08lx\n",
+		       (unsigned long)__raw_readq(&tx4927_ccfgptr->ccfg));
+	} else
+		pciclk = -1;
+	return pciclk;
+}
+
+void __init tx4927_setup_pcierr_irq(void)
+{
+	if (request_irq(TXX9_IRQ_BASE + TX4927_IR_PCIERR,
+			tx4927_pcierr_interrupt,
+			0, "PCI error",
+			(void *)TX4927_PCIC_REG))
+		printk(KERN_WARNING "Failed to request irq for PCIERR\n");
+}