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, 376 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-footbridge/dc21285.c b/kernel/arch/arm/mach-footbridge/dc21285.c
new file mode 100644
index 000000000..96a3d73ef
--- /dev/null
+++ b/kernel/arch/arm/mach-footbridge/dc21285.c
@@ -0,0 +1,376 @@
+/*
+ *  linux/arch/arm/kernel/dec21285.c: PCI functions for DC21285
+ *
+ *  Copyright (C) 1998-2001 Russell King
+ *  Copyright (C) 1998-2000 Phil Blundell
+ *
+ * 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/interrupt.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+
+#include <asm/irq.h>
+#include <asm/mach/pci.h>
+#include <asm/hardware/dec21285.h>
+
+#define MAX_SLOTS		21
+
+#define PCICMD_ABORT		((PCI_STATUS_REC_MASTER_ABORT| \
+				  PCI_STATUS_REC_TARGET_ABORT)<<16)
+
+#define PCICMD_ERROR_BITS	((PCI_STATUS_DETECTED_PARITY | \
+				  PCI_STATUS_REC_MASTER_ABORT | \
+				  PCI_STATUS_REC_TARGET_ABORT | \
+				  PCI_STATUS_PARITY) << 16)
+
+extern int setup_arm_irq(int, struct irqaction *);
+extern void pcibios_report_status(u_int status_mask, int warn);
+
+static unsigned long
+dc21285_base_address(struct pci_bus *bus, unsigned int devfn)
+{
+	unsigned long addr = 0;
+
+	if (bus->number == 0) {
+		if (PCI_SLOT(devfn) == 0)
+			/*
+			 * For devfn 0, point at the 21285
+			 */
+			addr = ARMCSR_BASE;
+		else {
+			devfn -= 1 << 3;
+
+			if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
+				addr = PCICFG0_BASE | 0xc00000 | (devfn << 8);
+		}
+	} else
+		addr = PCICFG1_BASE | (bus->number << 16) | (devfn << 8);
+
+	return addr;
+}
+
+static int
+dc21285_read_config(struct pci_bus *bus, unsigned int devfn, int where,
+		    int size, u32 *value)
+{
+	unsigned long addr = dc21285_base_address(bus, devfn);
+	u32 v = 0xffffffff;
+
+	if (addr)
+		switch (size) {
+		case 1:
+			asm("ldrb	%0, [%1, %2]"
+				: "=r" (v) : "r" (addr), "r" (where) : "cc");
+			break;
+		case 2:
+			asm("ldrh	%0, [%1, %2]"
+				: "=r" (v) : "r" (addr), "r" (where) : "cc");
+			break;
+		case 4:
+			asm("ldr	%0, [%1, %2]"
+				: "=r" (v) : "r" (addr), "r" (where) : "cc");
+			break;
+		}
+
+	*value = v;
+
+	v = *CSR_PCICMD;
+	if (v & PCICMD_ABORT) {
+		*CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
+		return -1;
+	}
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+dc21285_write_config(struct pci_bus *bus, unsigned int devfn, int where,
+		     int size, u32 value)
+{
+	unsigned long addr = dc21285_base_address(bus, devfn);
+	u32 v;
+
+	if (addr)
+		switch (size) {
+		case 1:
+			asm("strb	%0, [%1, %2]"
+				: : "r" (value), "r" (addr), "r" (where)
+				: "cc");
+			break;
+		case 2:
+			asm("strh	%0, [%1, %2]"
+				: : "r" (value), "r" (addr), "r" (where)
+				: "cc");
+			break;
+		case 4:
+			asm("str	%0, [%1, %2]"
+				: : "r" (value), "r" (addr), "r" (where)
+				: "cc");
+			break;
+		}
+
+	v = *CSR_PCICMD;
+	if (v & PCICMD_ABORT) {
+		*CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
+		return -1;
+	}
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops dc21285_ops = {
+	.read	= dc21285_read_config,
+	.write	= dc21285_write_config,
+};
+
+static struct timer_list serr_timer;
+static struct timer_list perr_timer;
+
+static void dc21285_enable_error(unsigned long __data)
+{
+	switch (__data) {
+	case IRQ_PCI_SERR:
+		del_timer(&serr_timer);
+		break;
+
+	case IRQ_PCI_PERR:
+		del_timer(&perr_timer);
+		break;
+	}
+
+	enable_irq(__data);
+}
+
+/*
+ * Warn on PCI errors.
+ */
+static irqreturn_t dc21285_abort_irq(int irq, void *dev_id)
+{
+	unsigned int cmd;
+	unsigned int status;
+
+	cmd = *CSR_PCICMD;
+	status = cmd >> 16;
+	cmd = cmd & 0xffff;
+
+	if (status & PCI_STATUS_REC_MASTER_ABORT) {
+		printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n",
+			instruction_pointer(get_irq_regs()));
+		cmd |= PCI_STATUS_REC_MASTER_ABORT << 16;
+	}
+
+	if (status & PCI_STATUS_REC_TARGET_ABORT) {
+		printk(KERN_DEBUG "PCI: target abort: ");
+		pcibios_report_status(PCI_STATUS_REC_MASTER_ABORT |
+				      PCI_STATUS_SIG_TARGET_ABORT |
+				      PCI_STATUS_REC_TARGET_ABORT, 1);
+		printk("\n");
+
+		cmd |= PCI_STATUS_REC_TARGET_ABORT << 16;
+	}
+
+	*CSR_PCICMD = cmd;
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t dc21285_serr_irq(int irq, void *dev_id)
+{
+	struct timer_list *timer = dev_id;
+	unsigned int cntl;
+
+	printk(KERN_DEBUG "PCI: system error received: ");
+	pcibios_report_status(PCI_STATUS_SIG_SYSTEM_ERROR, 1);
+	printk("\n");
+
+	cntl = *CSR_SA110_CNTL & 0xffffdf07;
+	*CSR_SA110_CNTL = cntl | SA110_CNTL_RXSERR;
+
+	/*
+	 * back off this interrupt
+	 */
+	disable_irq(irq);
+	timer->expires = jiffies + HZ;
+	add_timer(timer);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t dc21285_discard_irq(int irq, void *dev_id)
+{
+	printk(KERN_DEBUG "PCI: discard timer expired\n");
+	*CSR_SA110_CNTL &= 0xffffde07;
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t dc21285_dparity_irq(int irq, void *dev_id)
+{
+	unsigned int cmd;
+
+	printk(KERN_DEBUG "PCI: data parity error detected: ");
+	pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
+	printk("\n");
+
+	cmd = *CSR_PCICMD & 0xffff;
+	*CSR_PCICMD = cmd | 1 << 24;
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t dc21285_parity_irq(int irq, void *dev_id)
+{
+	struct timer_list *timer = dev_id;
+	unsigned int cmd;
+
+	printk(KERN_DEBUG "PCI: parity error detected: ");
+	pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
+	printk("\n");
+
+	cmd = *CSR_PCICMD & 0xffff;
+	*CSR_PCICMD = cmd | 1 << 31;
+
+	/*
+	 * back off this interrupt
+	 */
+	disable_irq(irq);
+	timer->expires = jiffies + HZ;
+	add_timer(timer);
+
+	return IRQ_HANDLED;
+}
+
+int __init dc21285_setup(int nr, struct pci_sys_data *sys)
+{
+	struct resource *res;
+
+	if (nr || !footbridge_cfn_mode())
+		return 0;
+
+	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
+	if (!res) {
+		printk("out of memory for root bus resources");
+		return 0;
+	}
+
+	res[0].flags = IORESOURCE_MEM;
+	res[0].name  = "Footbridge non-prefetch";
+	res[1].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
+	res[1].name  = "Footbridge prefetch";
+
+	allocate_resource(&iomem_resource, &res[1], 0x20000000,
+			  0xa0000000, 0xffffffff, 0x20000000, NULL, NULL);
+	allocate_resource(&iomem_resource, &res[0], 0x40000000,
+			  0x80000000, 0xffffffff, 0x40000000, NULL, NULL);
+
+	sys->mem_offset  = DC21285_PCI_MEM;
+
+	pci_add_resource_offset(&sys->resources, &res[0], sys->mem_offset);
+	pci_add_resource_offset(&sys->resources, &res[1], sys->mem_offset);
+
+	return 1;
+}
+
+#define dc21285_request_irq(_a, _b, _c, _d, _e) \
+	WARN_ON(request_irq(_a, _b, _c, _d, _e) < 0)
+
+void __init dc21285_preinit(void)
+{
+	unsigned int mem_size, mem_mask;
+	int cfn_mode;
+
+	pcibios_min_mem = 0x81000000;
+
+	mem_size = (unsigned int)high_memory - PAGE_OFFSET;
+	for (mem_mask = 0x00100000; mem_mask < 0x10000000; mem_mask <<= 1)
+		if (mem_mask >= mem_size)
+			break;
+
+	/*
+	 * These registers need to be set up whether we're the
+	 * central function or not.
+	 */
+	*CSR_SDRAMBASEMASK    = (mem_mask - 1) & 0x0ffc0000;
+	*CSR_SDRAMBASEOFFSET  = 0;
+	*CSR_ROMBASEMASK      = 0x80000000;
+	*CSR_CSRBASEMASK      = 0;
+	*CSR_CSRBASEOFFSET    = 0;
+	*CSR_PCIADDR_EXTN     = 0;
+
+	cfn_mode = __footbridge_cfn_mode();
+
+	printk(KERN_INFO "PCI: DC21285 footbridge, revision %02lX, in "
+		"%s mode\n", *CSR_CLASSREV & 0xff, cfn_mode ?
+		"central function" : "addin");
+
+	if (footbridge_cfn_mode()) {
+		/*
+		 * Clear any existing errors - we aren't
+		 * interested in historical data...
+		 */
+		*CSR_SA110_CNTL	= (*CSR_SA110_CNTL & 0xffffde07) |
+				  SA110_CNTL_RXSERR;
+		*CSR_PCICMD = (*CSR_PCICMD & 0xffff) | PCICMD_ERROR_BITS;
+	}
+
+	init_timer(&serr_timer);
+	init_timer(&perr_timer);
+
+	serr_timer.data = IRQ_PCI_SERR;
+	serr_timer.function = dc21285_enable_error;
+	perr_timer.data = IRQ_PCI_PERR;
+	perr_timer.function = dc21285_enable_error;
+
+	/*
+	 * We don't care if these fail.
+	 */
+	dc21285_request_irq(IRQ_PCI_SERR, dc21285_serr_irq, 0,
+			    "PCI system error", &serr_timer);
+	dc21285_request_irq(IRQ_PCI_PERR, dc21285_parity_irq, 0,
+			    "PCI parity error", &perr_timer);
+	dc21285_request_irq(IRQ_PCI_ABORT, dc21285_abort_irq, 0,
+			    "PCI abort", NULL);
+	dc21285_request_irq(IRQ_DISCARD_TIMER, dc21285_discard_irq, 0,
+			    "Discard timer", NULL);
+	dc21285_request_irq(IRQ_PCI_DPERR, dc21285_dparity_irq, 0,
+			    "PCI data parity", NULL);
+
+	if (cfn_mode) {
+		/*
+		 * Map our SDRAM at a known address in PCI space, just in case
+		 * the firmware had other ideas.  Using a nonzero base is
+		 * necessary, since some VGA cards forcefully use PCI addresses
+		 * in the range 0x000a0000 to 0x000c0000. (eg, S3 cards).
+		 */
+		*CSR_PCICSRBASE       = 0xf4000000;
+		*CSR_PCICSRIOBASE     = 0;
+		*CSR_PCISDRAMBASE     = __virt_to_bus(PAGE_OFFSET);
+		*CSR_PCIROMBASE       = 0;
+		*CSR_PCICMD = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+			      PCI_COMMAND_INVALIDATE | PCICMD_ERROR_BITS;
+	} else if (footbridge_cfn_mode() != 0) {
+		/*
+		 * If we are not compiled to accept "add-in" mode, then
+		 * we are using a constant virt_to_bus translation which
+		 * can not hope to cater for the way the host BIOS  has
+		 * set up the machine.
+		 */
+		panic("PCI: this kernel is compiled for central "
+			"function mode only");
+	}
+}
+
+void __init dc21285_postinit(void)
+{
+	register_isa_ports(DC21285_PCI_MEM, DC21285_PCI_IO, 0);
+}