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, 368 insertions, 0 deletions

diff --git a/kernel/arch/mips/pci/pci-xlr.c b/kernel/arch/mips/pci/pci-xlr.c
new file mode 100644
index 000000000..26d2dabef
--- /dev/null
+++ b/kernel/arch/mips/pci/pci-xlr.c
@@ -0,0 +1,368 @@
+/*
+ * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
+ * reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the NetLogic
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/msi.h>
+#include <linux/mm.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/console.h>
+#include <linux/pci_regs.h>
+
+#include <asm/io.h>
+
+#include <asm/netlogic/interrupt.h>
+#include <asm/netlogic/haldefs.h>
+#include <asm/netlogic/common.h>
+
+#include <asm/netlogic/xlr/msidef.h>
+#include <asm/netlogic/xlr/iomap.h>
+#include <asm/netlogic/xlr/pic.h>
+#include <asm/netlogic/xlr/xlr.h>
+
+static void *pci_config_base;
+
+#define pci_cfg_addr(bus, devfn, off) (((bus) << 16) | ((devfn) << 8) | (off))
+
+/* PCI ops */
+static inline u32 pci_cfg_read_32bit(struct pci_bus *bus, unsigned int devfn,
+	int where)
+{
+	u32 data;
+	u32 *cfgaddr;
+
+	cfgaddr = (u32 *)(pci_config_base +
+			pci_cfg_addr(bus->number, devfn, where & ~3));
+	data = *cfgaddr;
+	return cpu_to_le32(data);
+}
+
+static inline void pci_cfg_write_32bit(struct pci_bus *bus, unsigned int devfn,
+	int where, u32 data)
+{
+	u32 *cfgaddr;
+
+	cfgaddr = (u32 *)(pci_config_base +
+			pci_cfg_addr(bus->number, devfn, where & ~3));
+	*cfgaddr = cpu_to_le32(data);
+}
+
+static int nlm_pcibios_read(struct pci_bus *bus, unsigned int devfn,
+	int where, int size, u32 *val)
+{
+	u32 data;
+
+	if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	data = pci_cfg_read_32bit(bus, devfn, where);
+
+	if (size == 1)
+		*val = (data >> ((where & 3) << 3)) & 0xff;
+	else if (size == 2)
+		*val = (data >> ((where & 3) << 3)) & 0xffff;
+	else
+		*val = data;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+
+static int nlm_pcibios_write(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 val)
+{
+	u32 data;
+
+	if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	data = pci_cfg_read_32bit(bus, devfn, where);
+
+	if (size == 1)
+		data = (data & ~(0xff << ((where & 3) << 3))) |
+			(val << ((where & 3) << 3));
+	else if (size == 2)
+		data = (data & ~(0xffff << ((where & 3) << 3))) |
+			(val << ((where & 3) << 3));
+	else
+		data = val;
+
+	pci_cfg_write_32bit(bus, devfn, where, data);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops nlm_pci_ops = {
+	.read  = nlm_pcibios_read,
+	.write = nlm_pcibios_write
+};
+
+static struct resource nlm_pci_mem_resource = {
+	.name		= "XLR PCI MEM",
+	.start		= 0xd0000000UL, /* 256MB PCI mem @ 0xd000_0000 */
+	.end		= 0xdfffffffUL,
+	.flags		= IORESOURCE_MEM,
+};
+
+static struct resource nlm_pci_io_resource = {
+	.name		= "XLR IO MEM",
+	.start		= 0x10000000UL, /* 16MB PCI IO @ 0x1000_0000 */
+	.end		= 0x100fffffUL,
+	.flags		= IORESOURCE_IO,
+};
+
+struct pci_controller nlm_pci_controller = {
+	.index		= 0,
+	.pci_ops	= &nlm_pci_ops,
+	.mem_resource	= &nlm_pci_mem_resource,
+	.mem_offset	= 0x00000000UL,
+	.io_resource	= &nlm_pci_io_resource,
+	.io_offset	= 0x00000000UL,
+};
+
+/*
+ * The top level PCIe links on the XLS PCIe controller appear as
+ * bridges. Given a device, this function finds which link it is
+ * on.
+ */
+static struct pci_dev *xls_get_pcie_link(const struct pci_dev *dev)
+{
+	struct pci_bus *bus, *p;
+
+	/* Find the bridge on bus 0 */
+	bus = dev->bus;
+	for (p = bus->parent; p && p->number != 0; p = p->parent)
+		bus = p;
+
+	return p ? bus->self : NULL;
+}
+
+static int nlm_pci_link_to_irq(int link)
+{
+	switch	(link) {
+	case 0:
+		return PIC_PCIE_LINK0_IRQ;
+	case 1:
+		return PIC_PCIE_LINK1_IRQ;
+	case 2:
+		if (nlm_chip_is_xls_b())
+			return PIC_PCIE_XLSB0_LINK2_IRQ;
+		else
+			return PIC_PCIE_LINK2_IRQ;
+	case 3:
+		if (nlm_chip_is_xls_b())
+			return PIC_PCIE_XLSB0_LINK3_IRQ;
+		else
+			return PIC_PCIE_LINK3_IRQ;
+	}
+	WARN(1, "Unexpected link %d\n", link);
+	return 0;
+}
+
+static int get_irq_vector(const struct pci_dev *dev)
+{
+	struct pci_dev *lnk;
+	int link;
+
+	if (!nlm_chip_is_xls())
+		return	PIC_PCIX_IRQ;	/* for XLR just one IRQ */
+
+	lnk = xls_get_pcie_link(dev);
+	if (lnk == NULL)
+		return 0;
+
+	link = PCI_SLOT(lnk->devfn);
+	return nlm_pci_link_to_irq(link);
+}
+
+#ifdef CONFIG_PCI_MSI
+void arch_teardown_msi_irq(unsigned int irq)
+{
+}
+
+int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
+{
+	struct msi_msg msg;
+	struct pci_dev *lnk;
+	int irq, ret;
+	u16 val;
+
+	/* MSI not supported on XLR */
+	if (!nlm_chip_is_xls())
+		return 1;
+
+	/*
+	 * Enable MSI on the XLS PCIe controller bridge which was disabled
+	 * at enumeration, the bridge MSI capability is at 0x50
+	 */
+	lnk = xls_get_pcie_link(dev);
+	if (lnk == NULL)
+		return 1;
+
+	pci_read_config_word(lnk, 0x50 + PCI_MSI_FLAGS, &val);
+	if ((val & PCI_MSI_FLAGS_ENABLE) == 0) {
+		val |= PCI_MSI_FLAGS_ENABLE;
+		pci_write_config_word(lnk, 0x50 + PCI_MSI_FLAGS, val);
+	}
+
+	irq = get_irq_vector(dev);
+	if (irq <= 0)
+		return 1;
+
+	msg.address_hi = MSI_ADDR_BASE_HI;
+	msg.address_lo = MSI_ADDR_BASE_LO   |
+		MSI_ADDR_DEST_MODE_PHYSICAL |
+		MSI_ADDR_REDIRECTION_CPU;
+
+	msg.data = MSI_DATA_TRIGGER_EDGE |
+		MSI_DATA_LEVEL_ASSERT	 |
+		MSI_DATA_DELIVERY_FIXED;
+
+	ret = irq_set_msi_desc(irq, desc);
+	if (ret < 0)
+		return ret;
+
+	pci_write_msi_msg(irq, &msg);
+	return 0;
+}
+#endif
+
+/* Extra ACK needed for XLR on chip PCI controller */
+static void xlr_pci_ack(struct irq_data *d)
+{
+	uint64_t pcibase = nlm_mmio_base(NETLOGIC_IO_PCIX_OFFSET);
+
+	nlm_read_reg(pcibase, (0x140 >> 2));
+}
+
+/* Extra ACK needed for XLS on chip PCIe controller */
+static void xls_pcie_ack(struct irq_data *d)
+{
+	uint64_t pciebase_le = nlm_mmio_base(NETLOGIC_IO_PCIE_1_OFFSET);
+
+	switch (d->irq) {
+	case PIC_PCIE_LINK0_IRQ:
+		nlm_write_reg(pciebase_le, (0x90 >> 2), 0xffffffff);
+		break;
+	case PIC_PCIE_LINK1_IRQ:
+		nlm_write_reg(pciebase_le, (0x94 >> 2), 0xffffffff);
+		break;
+	case PIC_PCIE_LINK2_IRQ:
+		nlm_write_reg(pciebase_le, (0x190 >> 2), 0xffffffff);
+		break;
+	case PIC_PCIE_LINK3_IRQ:
+		nlm_write_reg(pciebase_le, (0x194 >> 2), 0xffffffff);
+		break;
+	}
+}
+
+/* For XLS B silicon, the 3,4 PCI interrupts are different */
+static void xls_pcie_ack_b(struct irq_data *d)
+{
+	uint64_t pciebase_le = nlm_mmio_base(NETLOGIC_IO_PCIE_1_OFFSET);
+
+	switch (d->irq) {
+	case PIC_PCIE_LINK0_IRQ:
+		nlm_write_reg(pciebase_le, (0x90 >> 2), 0xffffffff);
+		break;
+	case PIC_PCIE_LINK1_IRQ:
+		nlm_write_reg(pciebase_le, (0x94 >> 2), 0xffffffff);
+		break;
+	case PIC_PCIE_XLSB0_LINK2_IRQ:
+		nlm_write_reg(pciebase_le, (0x190 >> 2), 0xffffffff);
+		break;
+	case PIC_PCIE_XLSB0_LINK3_IRQ:
+		nlm_write_reg(pciebase_le, (0x194 >> 2), 0xffffffff);
+		break;
+	}
+}
+
+int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	return get_irq_vector(dev);
+}
+
+/* Do platform specific device initialization at pci_enable_device() time */
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+	return 0;
+}
+
+static int __init pcibios_init(void)
+{
+	void (*extra_ack)(struct irq_data *);
+	int link, irq;
+
+	/* PSB assigns PCI resources */
+	pci_set_flags(PCI_PROBE_ONLY);
+	pci_config_base = ioremap(DEFAULT_PCI_CONFIG_BASE, 16 << 20);
+
+	/* Extend IO port for memory mapped io */
+	ioport_resource.start =	 0;
+	ioport_resource.end   = ~0;
+
+	set_io_port_base(CKSEG1);
+	nlm_pci_controller.io_map_base = CKSEG1;
+
+	pr_info("Registering XLR/XLS PCIX/PCIE Controller.\n");
+	register_pci_controller(&nlm_pci_controller);
+
+	/*
+	 * For PCI interrupts, we need to ack the PCI controller too, overload
+	 * irq handler data to do this
+	 */
+	if (!nlm_chip_is_xls()) {
+		/* XLR PCI controller ACK */
+		nlm_set_pic_extra_ack(0, PIC_PCIX_IRQ, xlr_pci_ack);
+	} else {
+		if  (nlm_chip_is_xls_b())
+			extra_ack = xls_pcie_ack_b;
+		else
+			extra_ack = xls_pcie_ack;
+		for (link = 0; link < 4; link++) {
+			irq = nlm_pci_link_to_irq(link);
+			nlm_set_pic_extra_ack(0, irq, extra_ack);
+		}
+	}
+	return 0;
+}
+
+arch_initcall(pcibios_init);