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, 199 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-pxa/cm-x2xx-pci.c b/kernel/arch/arm/mach-pxa/cm-x2xx-pci.c
new file mode 100644
index 000000000..d8f816c24
--- /dev/null
+++ b/kernel/arch/arm/mach-pxa/cm-x2xx-pci.c
@@ -0,0 +1,199 @@
+/*
+ * linux/arch/arm/mach-pxa/cm-x2xx-pci.c
+ *
+ * PCI bios-type initialisation for PCI machines
+ *
+ * Bits taken from various places.
+ *
+ * Copyright (C) 2007, 2008 Compulab, Ltd.
+ * Mike Rapoport <mike@compulab.co.il>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+
+#include <asm/mach/pci.h>
+#include <asm/mach-types.h>
+
+#include <asm/hardware/it8152.h>
+
+void __iomem *it8152_base_address;
+static int cmx2xx_it8152_irq_gpio;
+
+static void cmx2xx_it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
+{
+	/* clear our parent irq */
+	desc->irq_data.chip->irq_ack(&desc->irq_data);
+
+	it8152_irq_demux(irq, desc);
+}
+
+void __cmx2xx_pci_init_irq(int irq_gpio)
+{
+	it8152_init_irq();
+
+	cmx2xx_it8152_irq_gpio = irq_gpio;
+
+	irq_set_irq_type(gpio_to_irq(irq_gpio), IRQ_TYPE_EDGE_RISING);
+
+	irq_set_chained_handler(gpio_to_irq(irq_gpio),
+				cmx2xx_it8152_irq_demux);
+}
+
+#ifdef CONFIG_PM
+static unsigned long sleep_save_ite[10];
+
+void __cmx2xx_pci_suspend(void)
+{
+	/* save ITE state */
+	sleep_save_ite[0] = __raw_readl(IT8152_INTC_PDCNIMR);
+	sleep_save_ite[1] = __raw_readl(IT8152_INTC_LPCNIMR);
+	sleep_save_ite[2] = __raw_readl(IT8152_INTC_LPNIAR);
+
+	/* Clear ITE IRQ's */
+	__raw_writel((0), IT8152_INTC_PDCNIRR);
+	__raw_writel((0), IT8152_INTC_LPCNIRR);
+}
+
+void __cmx2xx_pci_resume(void)
+{
+	/* restore IT8152 state */
+	__raw_writel((sleep_save_ite[0]), IT8152_INTC_PDCNIMR);
+	__raw_writel((sleep_save_ite[1]), IT8152_INTC_LPCNIMR);
+	__raw_writel((sleep_save_ite[2]), IT8152_INTC_LPNIAR);
+}
+#else
+void cmx2xx_pci_suspend(void) {}
+void cmx2xx_pci_resume(void) {}
+#endif
+
+/* PCI IRQ mapping*/
+static int __init cmx2xx_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	int irq;
+
+	dev_dbg(&dev->dev, "%s: slot=%x, pin=%x\n", __func__, slot, pin);
+
+	irq = it8152_pci_map_irq(dev, slot, pin);
+	if (irq)
+		return irq;
+
+	/*
+	  Here comes the ugly part. The routing is baseboard specific,
+	  but defining a platform for each possible base of CM-X2XX is
+	  unrealistic. Here we keep mapping for ATXBase and SB-X2XX.
+	*/
+	/* ATXBASE PCI slot */
+	if (slot == 7)
+		return IT8152_PCI_INTA;
+
+	/* ATXBase/SB-X2XX CardBus */
+	if (slot == 8 || slot == 0)
+		return IT8152_PCI_INTB;
+
+	/* ATXBase Ethernet */
+	if (slot == 9)
+		return IT8152_PCI_INTA;
+
+	/* CM-x255 Onboard Ethernet */
+	if (slot == 15)
+		return IT8152_PCI_INTC;
+
+	/* SB-x2xx Ethernet */
+	if (slot == 16)
+		return IT8152_PCI_INTA;
+
+	/* PC104+ interrupt routing */
+	if ((slot == 17) || (slot == 19))
+		return IT8152_PCI_INTA;
+	if ((slot == 18) || (slot == 20))
+		return IT8152_PCI_INTB;
+
+	return(0);
+}
+
+static void cmx2xx_pci_preinit(void)
+{
+	pr_info("Initializing CM-X2XX PCI subsystem\n");
+
+	pcibios_min_io = 0;
+	pcibios_min_mem = 0;
+
+	__raw_writel(0x800, IT8152_PCI_CFG_ADDR);
+	if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) {
+		pr_info("PCI Bridge found.\n");
+
+		/* set PCI I/O base at 0 */
+		writel(0x848, IT8152_PCI_CFG_ADDR);
+		writel(0, IT8152_PCI_CFG_DATA);
+
+		/* set PCI memory base at 0 */
+		writel(0x840, IT8152_PCI_CFG_ADDR);
+		writel(0, IT8152_PCI_CFG_DATA);
+
+		writel(0x20, IT8152_GPIO_GPDR);
+
+		/* CardBus Controller on ATXbase baseboard */
+		writel(0x4000, IT8152_PCI_CFG_ADDR);
+		if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) {
+			pr_info("CardBus Bridge found.\n");
+
+			/* Configure socket 0 */
+			writel(0x408C, IT8152_PCI_CFG_ADDR);
+			writel(0x1022, IT8152_PCI_CFG_DATA);
+
+			writel(0x4080, IT8152_PCI_CFG_ADDR);
+			writel(0x3844d060, IT8152_PCI_CFG_DATA);
+
+			writel(0x4090, IT8152_PCI_CFG_ADDR);
+			writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
+				0x60440000),
+			       IT8152_PCI_CFG_DATA);
+
+			writel(0x4018, IT8152_PCI_CFG_ADDR);
+			writel(0xb0000000, IT8152_PCI_CFG_DATA);
+
+			/* Configure socket 1 */
+			writel(0x418C, IT8152_PCI_CFG_ADDR);
+			writel(0x1022, IT8152_PCI_CFG_DATA);
+
+			writel(0x4180, IT8152_PCI_CFG_ADDR);
+			writel(0x3844d060, IT8152_PCI_CFG_DATA);
+
+			writel(0x4190, IT8152_PCI_CFG_ADDR);
+			writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
+				0x60440000),
+			       IT8152_PCI_CFG_DATA);
+
+			writel(0x4118, IT8152_PCI_CFG_ADDR);
+			writel(0xb0000000, IT8152_PCI_CFG_DATA);
+		}
+	}
+}
+
+static struct hw_pci cmx2xx_pci __initdata = {
+	.map_irq	= cmx2xx_pci_map_irq,
+	.nr_controllers	= 1,
+	.ops		= &it8152_ops,
+	.setup		= it8152_pci_setup,
+	.preinit	= cmx2xx_pci_preinit,
+};
+
+static int __init cmx2xx_init_pci(void)
+{
+	if (machine_is_armcore())
+		pci_common_init(&cmx2xx_pci);
+
+	return 0;
+}
+
+subsys_initcall(cmx2xx_init_pci);