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, 123 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-cns3xxx/pm.c b/kernel/arch/arm/mach-cns3xxx/pm.c
new file mode 100644
index 000000000..f46b78dd6
--- /dev/null
+++ b/kernel/arch/arm/mach-cns3xxx/pm.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright 2008 Cavium Networks
+ *
+ * This file 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/init.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/atomic.h>
+#include "cns3xxx.h"
+#include "pm.h"
+#include "core.h"
+
+void cns3xxx_pwr_clk_en(unsigned int block)
+{
+	u32 reg = __raw_readl(PM_CLK_GATE_REG);
+
+	reg |= (block & PM_CLK_GATE_REG_MASK);
+	__raw_writel(reg, PM_CLK_GATE_REG);
+}
+EXPORT_SYMBOL(cns3xxx_pwr_clk_en);
+
+void cns3xxx_pwr_clk_dis(unsigned int block)
+{
+	u32 reg = __raw_readl(PM_CLK_GATE_REG);
+
+	reg &= ~(block & PM_CLK_GATE_REG_MASK);
+	__raw_writel(reg, PM_CLK_GATE_REG);
+}
+EXPORT_SYMBOL(cns3xxx_pwr_clk_dis);
+
+void cns3xxx_pwr_power_up(unsigned int block)
+{
+	u32 reg = __raw_readl(PM_PLL_HM_PD_CTRL_REG);
+
+	reg &= ~(block & CNS3XXX_PWR_PLL_ALL);
+	__raw_writel(reg, PM_PLL_HM_PD_CTRL_REG);
+
+	/* Wait for 300us for the PLL output clock locked. */
+	udelay(300);
+};
+EXPORT_SYMBOL(cns3xxx_pwr_power_up);
+
+void cns3xxx_pwr_power_down(unsigned int block)
+{
+	u32 reg = __raw_readl(PM_PLL_HM_PD_CTRL_REG);
+
+	/* write '1' to power down */
+	reg |= (block & CNS3XXX_PWR_PLL_ALL);
+	__raw_writel(reg, PM_PLL_HM_PD_CTRL_REG);
+};
+EXPORT_SYMBOL(cns3xxx_pwr_power_down);
+
+static void cns3xxx_pwr_soft_rst_force(unsigned int block)
+{
+	u32 reg = __raw_readl(PM_SOFT_RST_REG);
+
+	/*
+	 * bit 0, 28, 29 => program low to reset,
+	 * the other else program low and then high
+	 */
+	if (block & 0x30000001) {
+		reg &= ~(block & PM_SOFT_RST_REG_MASK);
+	} else {
+		reg &= ~(block & PM_SOFT_RST_REG_MASK);
+		__raw_writel(reg, PM_SOFT_RST_REG);
+		reg |= (block & PM_SOFT_RST_REG_MASK);
+	}
+
+	__raw_writel(reg, PM_SOFT_RST_REG);
+}
+
+void cns3xxx_pwr_soft_rst(unsigned int block)
+{
+	static unsigned int soft_reset;
+
+	if (soft_reset & block) {
+		/* SPI/I2C/GPIO use the same block, reset once. */
+		return;
+	} else {
+		soft_reset |= block;
+	}
+	cns3xxx_pwr_soft_rst_force(block);
+}
+EXPORT_SYMBOL(cns3xxx_pwr_soft_rst);
+
+void cns3xxx_restart(enum reboot_mode mode, const char *cmd)
+{
+	/*
+	 * To reset, we hit the on-board reset register
+	 * in the system FPGA.
+	 */
+	cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(GLOBAL));
+}
+
+/*
+ * cns3xxx_cpu_clock - return CPU/L2 clock
+ *  aclk: cpu clock/2
+ *  hclk: cpu clock/4
+ *  pclk: cpu clock/8
+ */
+int cns3xxx_cpu_clock(void)
+{
+	u32 reg = __raw_readl(PM_CLK_CTRL_REG);
+	int cpu;
+	int cpu_sel;
+	int div_sel;
+
+	cpu_sel = (reg >> PM_CLK_CTRL_REG_OFFSET_PLL_CPU_SEL) & 0xf;
+	div_sel = (reg >> PM_CLK_CTRL_REG_OFFSET_CPU_CLK_DIV) & 0x3;
+
+	cpu = (300 + ((cpu_sel / 3) * 100) + ((cpu_sel % 3) * 33)) >> div_sel;
+
+	return cpu;
+}
+EXPORT_SYMBOL(cns3xxx_cpu_clock);
+
+atomic_t usb_pwr_ref = ATOMIC_INIT(0);
+EXPORT_SYMBOL(usb_pwr_ref);