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, 230 insertions, 0 deletions

diff --git a/kernel/arch/mips/pci/pci-ip27.c b/kernel/arch/mips/pci/pci-ip27.c
new file mode 100644
index 000000000..0f09eafa5
--- /dev/null
+++ b/kernel/arch/mips/pci/pci-ip27.c
@@ -0,0 +1,230 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2003 Christoph Hellwig (hch@lst.de)
+ * Copyright (C) 1999, 2000, 04 Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ */
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/pci.h>
+#include <linux/smp.h>
+#include <asm/sn/arch.h>
+#include <asm/pci/bridge.h>
+#include <asm/paccess.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/sn0/hub.h>
+
+/*
+ * Max #PCI busses we can handle; ie, max #PCI bridges.
+ */
+#define MAX_PCI_BUSSES		40
+
+/*
+ * Max #PCI devices (like scsi controllers) we handle on a bus.
+ */
+#define MAX_DEVICES_PER_PCIBUS	8
+
+/*
+ * XXX: No kmalloc available when we do our crosstalk scan,
+ *	we should try to move it later in the boot process.
+ */
+static struct bridge_controller bridges[MAX_PCI_BUSSES];
+
+/*
+ * Translate from irq to software PCI bus number and PCI slot.
+ */
+struct bridge_controller *irq_to_bridge[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
+int irq_to_slot[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
+
+extern struct pci_ops bridge_pci_ops;
+
+int bridge_probe(nasid_t nasid, int widget_id, int masterwid)
+{
+	unsigned long offset = NODE_OFFSET(nasid);
+	struct bridge_controller *bc;
+	static int num_bridges = 0;
+	bridge_t *bridge;
+	int slot;
+
+	pci_set_flags(PCI_PROBE_ONLY);
+
+	printk("a bridge\n");
+
+	/* XXX: kludge alert.. */
+	if (!num_bridges)
+		ioport_resource.end = ~0UL;
+
+	bc = &bridges[num_bridges];
+
+	bc->pc.pci_ops		= &bridge_pci_ops;
+	bc->pc.mem_resource	= &bc->mem;
+	bc->pc.io_resource	= &bc->io;
+
+	bc->pc.index		= num_bridges;
+
+	bc->mem.name		= "Bridge PCI MEM";
+	bc->pc.mem_offset	= offset;
+	bc->mem.start		= 0;
+	bc->mem.end		= ~0UL;
+	bc->mem.flags		= IORESOURCE_MEM;
+
+	bc->io.name		= "Bridge IO MEM";
+	bc->pc.io_offset	= offset;
+	bc->io.start		= 0UL;
+	bc->io.end		= ~0UL;
+	bc->io.flags		= IORESOURCE_IO;
+
+	bc->irq_cpu = smp_processor_id();
+	bc->widget_id = widget_id;
+	bc->nasid = nasid;
+
+	bc->baddr = (u64)masterwid << 60 | PCI64_ATTR_BAR;
+
+	/*
+	 * point to this bridge
+	 */
+	bridge = (bridge_t *) RAW_NODE_SWIN_BASE(nasid, widget_id);
+
+	/*
+	 * Clear all pending interrupts.
+	 */
+	bridge->b_int_rst_stat = BRIDGE_IRR_ALL_CLR;
+
+	/*
+	 * Until otherwise set up, assume all interrupts are from slot 0
+	 */
+	bridge->b_int_device = 0x0;
+
+	/*
+	 * swap pio's to pci mem and io space (big windows)
+	 */
+	bridge->b_wid_control |= BRIDGE_CTRL_IO_SWAP |
+				 BRIDGE_CTRL_MEM_SWAP;
+#ifdef CONFIG_PAGE_SIZE_4KB
+	bridge->b_wid_control &= ~BRIDGE_CTRL_PAGE_SIZE;
+#else /* 16kB or larger */
+	bridge->b_wid_control |= BRIDGE_CTRL_PAGE_SIZE;
+#endif
+
+	/*
+	 * Hmm...  IRIX sets additional bits in the address which
+	 * are documented as reserved in the bridge docs.
+	 */
+	bridge->b_wid_int_upper = 0x8000 | (masterwid << 16);
+	bridge->b_wid_int_lower = 0x01800090;	/* PI_INT_PEND_MOD off*/
+	bridge->b_dir_map = (masterwid << 20);	/* DMA */
+	bridge->b_int_enable = 0;
+
+	for (slot = 0; slot < 8; slot ++) {
+		bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR;
+		bc->pci_int[slot] = -1;
+	}
+	bridge->b_wid_tflush;	  /* wait until Bridge PIO complete */
+
+	bc->base = bridge;
+
+	register_pci_controller(&bc->pc);
+
+	num_bridges++;
+
+	return 0;
+}
+
+/*
+ * All observed requests have pin == 1. We could have a global here, that
+ * gets incremented and returned every time - unfortunately, pci_map_irq
+ * may be called on the same device over and over, and need to return the
+ * same value. On O2000, pin can be 0 or 1, and PCI slots can be [0..7].
+ *
+ * A given PCI device, in general, should be able to intr any of the cpus
+ * on any one of the hubs connected to its xbow.
+ */
+int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	return 0;
+}
+
+static inline struct pci_dev *bridge_root_dev(struct pci_dev *dev)
+{
+	while (dev->bus->parent) {
+		/* Move up the chain of bridges. */
+		dev = dev->bus->self;
+	}
+
+	return dev;
+}
+
+/* Do platform specific device initialization at pci_enable_device() time */
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+	struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
+	struct pci_dev *rdev = bridge_root_dev(dev);
+	int slot = PCI_SLOT(rdev->devfn);
+	int irq;
+
+	irq = bc->pci_int[slot];
+	if (irq == -1) {
+		irq = request_bridge_irq(bc);
+		if (irq < 0)
+			return irq;
+
+		bc->pci_int[slot] = irq;
+	}
+
+	irq_to_bridge[irq] = bc;
+	irq_to_slot[irq] = slot;
+
+	dev->irq = irq;
+
+	return 0;
+}
+
+/*
+ * Device might live on a subordinate PCI bus.	XXX Walk up the chain of buses
+ * to find the slot number in sense of the bridge device register.
+ * XXX This also means multiple devices might rely on conflicting bridge
+ * settings.
+ */
+
+static inline void pci_disable_swapping(struct pci_dev *dev)
+{
+	struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
+	bridge_t *bridge = bc->base;
+	int slot = PCI_SLOT(dev->devfn);
+
+	/* Turn off byte swapping */
+	bridge->b_device[slot].reg &= ~BRIDGE_DEV_SWAP_DIR;
+	bridge->b_widget.w_tflush;	/* Flush */
+}
+
+static inline void pci_enable_swapping(struct pci_dev *dev)
+{
+	struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
+	bridge_t *bridge = bc->base;
+	int slot = PCI_SLOT(dev->devfn);
+
+	/* Turn on byte swapping */
+	bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR;
+	bridge->b_widget.w_tflush;	/* Flush */
+}
+
+static void pci_fixup_ioc3(struct pci_dev *d)
+{
+	pci_disable_swapping(d);
+}
+
+#ifdef CONFIG_NUMA
+int pcibus_to_node(struct pci_bus *bus)
+{
+	struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
+
+	return bc->nasid;
+}
+EXPORT_SYMBOL(pcibus_to_node);
+#endif /* CONFIG_NUMA */
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3,
+	pci_fixup_ioc3);