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, 320 insertions, 0 deletions

diff --git a/kernel/arch/mips/pci/pci-vr41xx.c b/kernel/arch/mips/pci/pci-vr41xx.c
new file mode 100644
index 000000000..157c7715b
--- /dev/null
+++ b/kernel/arch/mips/pci/pci-vr41xx.c
@@ -0,0 +1,320 @@
+/*
+ *  pci-vr41xx.c, PCI Control Unit routines for the NEC VR4100 series.
+ *
+ *  Copyright (C) 2001-2003 MontaVista Software Inc.
+ *    Author: Yoichi Yuasa <source@mvista.com>
+ *  Copyright (C) 2004-2008  Yoichi Yuasa <yuasa@linux-mips.org>
+ *  Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+/*
+ * Changes:
+ *  MontaVista Software Inc. <source@mvista.com>
+ *  - New creation, NEC VR4122 and VR4131 are supported.
+ */
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+
+#include <asm/cpu.h>
+#include <asm/io.h>
+#include <asm/vr41xx/pci.h>
+#include <asm/vr41xx/vr41xx.h>
+
+#include "pci-vr41xx.h"
+
+extern struct pci_ops vr41xx_pci_ops;
+
+static void __iomem *pciu_base;
+
+#define pciu_read(offset)		readl(pciu_base + (offset))
+#define pciu_write(offset, value)	writel((value), pciu_base + (offset))
+
+static struct pci_master_address_conversion pci_master_memory1 = {
+	.bus_base_address	= PCI_MASTER_MEM1_BUS_BASE_ADDRESS,
+	.address_mask		= PCI_MASTER_MEM1_ADDRESS_MASK,
+	.pci_base_address	= PCI_MASTER_MEM1_PCI_BASE_ADDRESS,
+};
+
+static struct pci_target_address_conversion pci_target_memory1 = {
+	.address_mask		= PCI_TARGET_MEM1_ADDRESS_MASK,
+	.bus_base_address	= PCI_TARGET_MEM1_BUS_BASE_ADDRESS,
+};
+
+static struct pci_master_address_conversion pci_master_io = {
+	.bus_base_address	= PCI_MASTER_IO_BUS_BASE_ADDRESS,
+	.address_mask		= PCI_MASTER_IO_ADDRESS_MASK,
+	.pci_base_address	= PCI_MASTER_IO_PCI_BASE_ADDRESS,
+};
+
+static struct pci_mailbox_address pci_mailbox = {
+	.base_address		= PCI_MAILBOX_BASE_ADDRESS,
+};
+
+static struct pci_target_address_window pci_target_window1 = {
+	.base_address		= PCI_TARGET_WINDOW1_BASE_ADDRESS,
+};
+
+static struct resource pci_mem_resource = {
+	.name	= "PCI Memory resources",
+	.start	= PCI_MEM_RESOURCE_START,
+	.end	= PCI_MEM_RESOURCE_END,
+	.flags	= IORESOURCE_MEM,
+};
+
+static struct resource pci_io_resource = {
+	.name	= "PCI I/O resources",
+	.start	= PCI_IO_RESOURCE_START,
+	.end	= PCI_IO_RESOURCE_END,
+	.flags	= IORESOURCE_IO,
+};
+
+static struct pci_controller_unit_setup vr41xx_pci_controller_unit_setup = {
+	.master_memory1				= &pci_master_memory1,
+	.target_memory1				= &pci_target_memory1,
+	.master_io				= &pci_master_io,
+	.exclusive_access			= CANNOT_LOCK_FROM_DEVICE,
+	.wait_time_limit_from_irdy_to_trdy	= 0,
+	.mailbox				= &pci_mailbox,
+	.target_window1				= &pci_target_window1,
+	.master_latency_timer			= 0x80,
+	.retry_limit				= 0,
+	.arbiter_priority_control		= PCI_ARBITRATION_MODE_FAIR,
+	.take_away_gnt_mode			= PCI_TAKE_AWAY_GNT_DISABLE,
+};
+
+static struct pci_controller vr41xx_pci_controller = {
+	.pci_ops	= &vr41xx_pci_ops,
+	.mem_resource	= &pci_mem_resource,
+	.io_resource	= &pci_io_resource,
+};
+
+void __init vr41xx_pciu_setup(struct pci_controller_unit_setup *setup)
+{
+	vr41xx_pci_controller_unit_setup = *setup;
+}
+
+static int __init vr41xx_pciu_init(void)
+{
+	struct pci_controller_unit_setup *setup;
+	struct pci_master_address_conversion *master;
+	struct pci_target_address_conversion *target;
+	struct pci_mailbox_address *mailbox;
+	struct pci_target_address_window *window;
+	unsigned long vtclock, pci_clock_max;
+	uint32_t val;
+
+	setup = &vr41xx_pci_controller_unit_setup;
+
+	if (request_mem_region(PCIU_BASE, PCIU_SIZE, "PCIU") == NULL)
+		return -EBUSY;
+
+	pciu_base = ioremap(PCIU_BASE, PCIU_SIZE);
+	if (pciu_base == NULL) {
+		release_mem_region(PCIU_BASE, PCIU_SIZE);
+		return -EBUSY;
+	}
+
+	/* Disable PCI interrupt */
+	vr41xx_disable_pciint();
+
+	/* Supply VTClock to PCIU */
+	vr41xx_supply_clock(PCIU_CLOCK);
+
+	/* Dummy write, waiting for supply of VTClock. */
+	vr41xx_disable_pciint();
+
+	/* Select PCI clock */
+	if (setup->pci_clock_max != 0)
+		pci_clock_max = setup->pci_clock_max;
+	else
+		pci_clock_max = PCI_CLOCK_MAX;
+	vtclock = vr41xx_get_vtclock_frequency();
+	if (vtclock < pci_clock_max)
+		pciu_write(PCICLKSELREG, EQUAL_VTCLOCK);
+	else if ((vtclock / 2) < pci_clock_max)
+		pciu_write(PCICLKSELREG, HALF_VTCLOCK);
+	else if (current_cpu_data.processor_id >= PRID_VR4131_REV2_1 &&
+		 (vtclock / 3) < pci_clock_max)
+		pciu_write(PCICLKSELREG, ONE_THIRD_VTCLOCK);
+	else if ((vtclock / 4) < pci_clock_max)
+		pciu_write(PCICLKSELREG, QUARTER_VTCLOCK);
+	else {
+		printk(KERN_ERR "PCI Clock is over 33MHz.\n");
+		iounmap(pciu_base);
+		return -EINVAL;
+	}
+
+	/* Supply PCI clock by PCI bus */
+	vr41xx_supply_clock(PCI_CLOCK);
+
+	if (setup->master_memory1 != NULL) {
+		master = setup->master_memory1;
+		val = IBA(master->bus_base_address) |
+		      MASTER_MSK(master->address_mask) |
+		      WINEN |
+		      PCIA(master->pci_base_address);
+		pciu_write(PCIMMAW1REG, val);
+	} else {
+		val = pciu_read(PCIMMAW1REG);
+		val &= ~WINEN;
+		pciu_write(PCIMMAW1REG, val);
+	}
+
+	if (setup->master_memory2 != NULL) {
+		master = setup->master_memory2;
+		val = IBA(master->bus_base_address) |
+		      MASTER_MSK(master->address_mask) |
+		      WINEN |
+		      PCIA(master->pci_base_address);
+		pciu_write(PCIMMAW2REG, val);
+	} else {
+		val = pciu_read(PCIMMAW2REG);
+		val &= ~WINEN;
+		pciu_write(PCIMMAW2REG, val);
+	}
+
+	if (setup->target_memory1 != NULL) {
+		target = setup->target_memory1;
+		val = TARGET_MSK(target->address_mask) |
+		      WINEN |
+		      ITA(target->bus_base_address);
+		pciu_write(PCITAW1REG, val);
+	} else {
+		val = pciu_read(PCITAW1REG);
+		val &= ~WINEN;
+		pciu_write(PCITAW1REG, val);
+	}
+
+	if (setup->target_memory2 != NULL) {
+		target = setup->target_memory2;
+		val = TARGET_MSK(target->address_mask) |
+		      WINEN |
+		      ITA(target->bus_base_address);
+		pciu_write(PCITAW2REG, val);
+	} else {
+		val = pciu_read(PCITAW2REG);
+		val &= ~WINEN;
+		pciu_write(PCITAW2REG, val);
+	}
+
+	if (setup->master_io != NULL) {
+		master = setup->master_io;
+		val = IBA(master->bus_base_address) |
+		      MASTER_MSK(master->address_mask) |
+		      WINEN |
+		      PCIIA(master->pci_base_address);
+		pciu_write(PCIMIOAWREG, val);
+	} else {
+		val = pciu_read(PCIMIOAWREG);
+		val &= ~WINEN;
+		pciu_write(PCIMIOAWREG, val);
+	}
+
+	if (setup->exclusive_access == CANNOT_LOCK_FROM_DEVICE)
+		pciu_write(PCIEXACCREG, UNLOCK);
+	else
+		pciu_write(PCIEXACCREG, 0);
+
+	if (current_cpu_type() == CPU_VR4122)
+		pciu_write(PCITRDYVREG, TRDYV(setup->wait_time_limit_from_irdy_to_trdy));
+
+	pciu_write(LATTIMEREG, MLTIM(setup->master_latency_timer));
+
+	if (setup->mailbox != NULL) {
+		mailbox = setup->mailbox;
+		val = MBADD(mailbox->base_address) | TYPE_32BITSPACE |
+		      MSI_MEMORY | PREF_APPROVAL;
+		pciu_write(MAILBAREG, val);
+	}
+
+	if (setup->target_window1) {
+		window = setup->target_window1;
+		val = PMBA(window->base_address) | TYPE_32BITSPACE |
+		      MSI_MEMORY | PREF_APPROVAL;
+		pciu_write(PCIMBA1REG, val);
+	}
+
+	if (setup->target_window2) {
+		window = setup->target_window2;
+		val = PMBA(window->base_address) | TYPE_32BITSPACE |
+		      MSI_MEMORY | PREF_APPROVAL;
+		pciu_write(PCIMBA2REG, val);
+	}
+
+	val = pciu_read(RETVALREG);
+	val &= ~RTYVAL_MASK;
+	val |= RTYVAL(setup->retry_limit);
+	pciu_write(RETVALREG, val);
+
+	val = pciu_read(PCIAPCNTREG);
+	val &= ~(TKYGNT | PAPC);
+
+	switch (setup->arbiter_priority_control) {
+	case PCI_ARBITRATION_MODE_ALTERNATE_0:
+		val |= PAPC_ALTERNATE_0;
+		break;
+	case PCI_ARBITRATION_MODE_ALTERNATE_B:
+		val |= PAPC_ALTERNATE_B;
+		break;
+	default:
+		val |= PAPC_FAIR;
+		break;
+	}
+
+	if (setup->take_away_gnt_mode == PCI_TAKE_AWAY_GNT_ENABLE)
+		val |= TKYGNT_ENABLE;
+
+	pciu_write(PCIAPCNTREG, val);
+
+	pciu_write(COMMANDREG, PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+			       PCI_COMMAND_MASTER | PCI_COMMAND_PARITY |
+			       PCI_COMMAND_SERR);
+
+	/* Clear bus error */
+	pciu_read(BUSERRADREG);
+
+	pciu_write(PCIENREG, PCIU_CONFIG_DONE);
+
+	if (setup->mem_resource != NULL)
+		vr41xx_pci_controller.mem_resource = setup->mem_resource;
+
+	if (setup->io_resource != NULL) {
+		vr41xx_pci_controller.io_resource = setup->io_resource;
+	} else {
+		set_io_port_base(IO_PORT_BASE);
+		ioport_resource.start = IO_PORT_RESOURCE_START;
+		ioport_resource.end = IO_PORT_RESOURCE_END;
+	}
+
+	if (setup->master_io) {
+		void __iomem *io_map_base;
+		struct resource *res = vr41xx_pci_controller.io_resource;
+		master = setup->master_io;
+		io_map_base = ioremap(master->bus_base_address,
+				      resource_size(res));
+		if (!io_map_base)
+			return -EBUSY;
+
+		vr41xx_pci_controller.io_map_base = (unsigned long)io_map_base;
+	}
+
+	register_pci_controller(&vr41xx_pci_controller);
+
+	return 0;
+}
+
+arch_initcall(vr41xx_pciu_init);