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, 433 insertions, 0 deletions

diff --git a/kernel/drivers/watchdog/at32ap700x_wdt.c b/kernel/drivers/watchdog/at32ap700x_wdt.c
new file mode 100644
index 000000000..81ba8920f
--- /dev/null
+++ b/kernel/drivers/watchdog/at32ap700x_wdt.c
@@ -0,0 +1,433 @@
+/*
+ * Watchdog driver for Atmel AT32AP700X devices
+ *
+ * Copyright (C) 2005-2006 Atmel Corporation
+ *
+ * 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.
+ *
+ *
+ * Errata: WDT Clear is blocked after WDT Reset
+ *
+ * A watchdog timer event will, after reset, block writes to the WDT_CLEAR
+ * register, preventing the program to clear the next Watchdog Timer Reset.
+ *
+ * If you still want to use the WDT after a WDT reset a small code can be
+ * insterted at the startup checking the AVR32_PM.rcause register for WDT reset
+ * and use a GPIO pin to reset the system. This method requires that one of the
+ * GPIO pins are available and connected externally to the RESET_N pin. After
+ * the GPIO pin has pulled down the reset line the GPIO will be reset and leave
+ * the pin tristated with pullup.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+
+#define TIMEOUT_MIN		1
+#define TIMEOUT_MAX		2
+#define TIMEOUT_DEFAULT		TIMEOUT_MAX
+
+/* module parameters */
+static int timeout =  TIMEOUT_DEFAULT;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+		"Timeout value. Limited to be 1 or 2 seconds. (default="
+		__MODULE_STRING(TIMEOUT_DEFAULT) ")");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/* Watchdog registers and write/read macro */
+#define WDT_CTRL		0x00
+#define WDT_CTRL_EN		   0
+#define WDT_CTRL_PSEL		   8
+#define WDT_CTRL_KEY		  24
+
+#define WDT_CLR			0x04
+
+#define WDT_RCAUSE		0x10
+#define WDT_RCAUSE_POR		   0
+#define WDT_RCAUSE_EXT		   2
+#define WDT_RCAUSE_WDT		   3
+#define WDT_RCAUSE_JTAG		   4
+#define WDT_RCAUSE_SERP		   5
+
+#define WDT_BIT(name)		(1 << WDT_##name)
+#define WDT_BF(name, value)	((value) << WDT_##name)
+
+#define wdt_readl(dev, reg)				\
+	__raw_readl((dev)->regs + WDT_##reg)
+#define wdt_writel(dev, reg, value)			\
+	__raw_writel((value), (dev)->regs + WDT_##reg)
+
+struct wdt_at32ap700x {
+	void __iomem		*regs;
+	spinlock_t		io_lock;
+	int			timeout;
+	int			boot_status;
+	unsigned long		users;
+	struct miscdevice	miscdev;
+};
+
+static struct wdt_at32ap700x *wdt;
+static char expect_release;
+
+/*
+ * Disable the watchdog.
+ */
+static inline void at32_wdt_stop(void)
+{
+	unsigned long psel;
+
+	spin_lock(&wdt->io_lock);
+	psel = wdt_readl(wdt, CTRL) & WDT_BF(CTRL_PSEL, 0x0f);
+	wdt_writel(wdt, CTRL, psel | WDT_BF(CTRL_KEY, 0x55));
+	wdt_writel(wdt, CTRL, psel | WDT_BF(CTRL_KEY, 0xaa));
+	spin_unlock(&wdt->io_lock);
+}
+
+/*
+ * Enable and reset the watchdog.
+ */
+static inline void at32_wdt_start(void)
+{
+	/* 0xf is 2^16 divider = 2 sec, 0xe is 2^15 divider = 1 sec */
+	unsigned long psel = (wdt->timeout > 1) ? 0xf : 0xe;
+
+	spin_lock(&wdt->io_lock);
+	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
+			| WDT_BF(CTRL_PSEL, psel)
+			| WDT_BF(CTRL_KEY, 0x55));
+	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
+			| WDT_BF(CTRL_PSEL, psel)
+			| WDT_BF(CTRL_KEY, 0xaa));
+	spin_unlock(&wdt->io_lock);
+}
+
+/*
+ * Pat the watchdog timer.
+ */
+static inline void at32_wdt_pat(void)
+{
+	spin_lock(&wdt->io_lock);
+	wdt_writel(wdt, CLR, 0x42);
+	spin_unlock(&wdt->io_lock);
+}
+
+/*
+ * Watchdog device is opened, and watchdog starts running.
+ */
+static int at32_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(1, &wdt->users))
+		return -EBUSY;
+
+	at32_wdt_start();
+	return nonseekable_open(inode, file);
+}
+
+/*
+ * Close the watchdog device.
+ */
+static int at32_wdt_close(struct inode *inode, struct file *file)
+{
+	if (expect_release == 42) {
+		at32_wdt_stop();
+	} else {
+		dev_dbg(wdt->miscdev.parent,
+			"unexpected close, not stopping watchdog!\n");
+		at32_wdt_pat();
+	}
+	clear_bit(1, &wdt->users);
+	expect_release = 0;
+	return 0;
+}
+
+/*
+ * Change the watchdog time interval.
+ */
+static int at32_wdt_settimeout(int time)
+{
+	/*
+	 * All counting occurs at 1 / SLOW_CLOCK (32 kHz) and max prescaler is
+	 * 2 ^ 16 allowing up to 2 seconds timeout.
+	 */
+	if ((time < TIMEOUT_MIN) || (time > TIMEOUT_MAX))
+		return -EINVAL;
+
+	/*
+	 * Set new watchdog time. It will be used when at32_wdt_start() is
+	 * called.
+	 */
+	wdt->timeout = time;
+	return 0;
+}
+
+/*
+ * Get the watchdog status.
+ */
+static int at32_wdt_get_status(void)
+{
+	int rcause;
+	int status = 0;
+
+	rcause = wdt_readl(wdt, RCAUSE);
+
+	switch (rcause) {
+	case WDT_BIT(RCAUSE_EXT):
+		status = WDIOF_EXTERN1;
+		break;
+	case WDT_BIT(RCAUSE_WDT):
+		status = WDIOF_CARDRESET;
+		break;
+	case WDT_BIT(RCAUSE_POR):  /* fall through */
+	case WDT_BIT(RCAUSE_JTAG): /* fall through */
+	case WDT_BIT(RCAUSE_SERP): /* fall through */
+	default:
+		break;
+	}
+
+	return status;
+}
+
+static const struct watchdog_info at32_wdt_info = {
+	.identity	= "at32ap700x watchdog",
+	.options	= WDIOF_SETTIMEOUT |
+			  WDIOF_KEEPALIVEPING |
+			  WDIOF_MAGICCLOSE,
+};
+
+/*
+ * Handle commands from user-space.
+ */
+static long at32_wdt_ioctl(struct file *file,
+				unsigned int cmd, unsigned long arg)
+{
+	int ret = -ENOTTY;
+	int time;
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		ret = copy_to_user(argp, &at32_wdt_info,
+				sizeof(at32_wdt_info)) ? -EFAULT : 0;
+		break;
+	case WDIOC_GETSTATUS:
+		ret = put_user(0, p);
+		break;
+	case WDIOC_GETBOOTSTATUS:
+		ret = put_user(wdt->boot_status, p);
+		break;
+	case WDIOC_SETOPTIONS:
+		ret = get_user(time, p);
+		if (ret)
+			break;
+		if (time & WDIOS_DISABLECARD)
+			at32_wdt_stop();
+		if (time & WDIOS_ENABLECARD)
+			at32_wdt_start();
+		ret = 0;
+		break;
+	case WDIOC_KEEPALIVE:
+		at32_wdt_pat();
+		ret = 0;
+		break;
+	case WDIOC_SETTIMEOUT:
+		ret = get_user(time, p);
+		if (ret)
+			break;
+		ret = at32_wdt_settimeout(time);
+		if (ret)
+			break;
+		/* Enable new time value */
+		at32_wdt_start();
+		/* fall through */
+	case WDIOC_GETTIMEOUT:
+		ret = put_user(wdt->timeout, p);
+		break;
+	}
+
+	return ret;
+}
+
+static ssize_t at32_wdt_write(struct file *file, const char __user *data,
+				size_t len, loff_t *ppos)
+{
+	/* See if we got the magic character 'V' and reload the timer */
+	if (len) {
+		if (!nowayout) {
+			size_t i;
+
+			/*
+			 * note: just in case someone wrote the magic
+			 * character five months ago...
+			 */
+			expect_release = 0;
+
+			/*
+			 * scan to see whether or not we got the magic
+			 * character
+			 */
+			for (i = 0; i != len; i++) {
+				char c;
+				if (get_user(c, data + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_release = 42;
+			}
+		}
+		/* someone wrote to us, we should pat the watchdog */
+		at32_wdt_pat();
+	}
+	return len;
+}
+
+static const struct file_operations at32_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.unlocked_ioctl	= at32_wdt_ioctl,
+	.open		= at32_wdt_open,
+	.release	= at32_wdt_close,
+	.write		= at32_wdt_write,
+};
+
+static int __init at32_wdt_probe(struct platform_device *pdev)
+{
+	struct resource	*regs;
+	int ret;
+
+	if (wdt) {
+		dev_dbg(&pdev->dev, "only 1 wdt instance supported.\n");
+		return -EBUSY;
+	}
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!regs) {
+		dev_dbg(&pdev->dev, "missing mmio resource\n");
+		return -ENXIO;
+	}
+
+	wdt = devm_kzalloc(&pdev->dev, sizeof(struct wdt_at32ap700x),
+			GFP_KERNEL);
+	if (!wdt)
+		return -ENOMEM;
+
+	wdt->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
+	if (!wdt->regs) {
+		ret = -ENOMEM;
+		dev_dbg(&pdev->dev, "could not map I/O memory\n");
+		goto err_free;
+	}
+
+	spin_lock_init(&wdt->io_lock);
+	wdt->boot_status = at32_wdt_get_status();
+
+	/* Work-around for watchdog silicon errata. */
+	if (wdt->boot_status & WDIOF_CARDRESET) {
+		dev_info(&pdev->dev, "CPU must be reset with external "
+				"reset or POR due to silicon errata.\n");
+		ret = -EIO;
+		goto err_free;
+	} else {
+		wdt->users = 0;
+	}
+
+	wdt->miscdev.minor	= WATCHDOG_MINOR;
+	wdt->miscdev.name	= "watchdog";
+	wdt->miscdev.fops	= &at32_wdt_fops;
+	wdt->miscdev.parent	= &pdev->dev;
+
+	platform_set_drvdata(pdev, wdt);
+
+	if (at32_wdt_settimeout(timeout)) {
+		at32_wdt_settimeout(TIMEOUT_DEFAULT);
+		dev_dbg(&pdev->dev,
+			"default timeout invalid, set to %d sec.\n",
+			TIMEOUT_DEFAULT);
+	}
+
+	ret = misc_register(&wdt->miscdev);
+	if (ret) {
+		dev_dbg(&pdev->dev, "failed to register wdt miscdev\n");
+		goto err_free;
+	}
+
+	dev_info(&pdev->dev,
+		"AT32AP700X WDT at 0x%p, timeout %d sec (nowayout=%d)\n",
+		wdt->regs, wdt->timeout, nowayout);
+
+	return 0;
+
+err_free:
+	wdt = NULL;
+	return ret;
+}
+
+static int __exit at32_wdt_remove(struct platform_device *pdev)
+{
+	if (wdt && platform_get_drvdata(pdev) == wdt) {
+		/* Stop the timer before we leave */
+		if (!nowayout)
+			at32_wdt_stop();
+
+		misc_deregister(&wdt->miscdev);
+		wdt = NULL;
+	}
+	return 0;
+}
+
+static void at32_wdt_shutdown(struct platform_device *pdev)
+{
+	at32_wdt_stop();
+}
+
+#ifdef CONFIG_PM
+static int at32_wdt_suspend(struct platform_device *pdev, pm_message_t message)
+{
+	at32_wdt_stop();
+	return 0;
+}
+
+static int at32_wdt_resume(struct platform_device *pdev)
+{
+	if (wdt->users)
+		at32_wdt_start();
+	return 0;
+}
+#else
+#define at32_wdt_suspend NULL
+#define at32_wdt_resume NULL
+#endif
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:at32_wdt");
+
+static struct platform_driver at32_wdt_driver = {
+	.remove		= __exit_p(at32_wdt_remove),
+	.suspend	= at32_wdt_suspend,
+	.resume		= at32_wdt_resume,
+	.driver		= {
+		.name	= "at32_wdt",
+	},
+	.shutdown	= at32_wdt_shutdown,
+};
+
+module_platform_driver_probe(at32_wdt_driver, at32_wdt_probe);
+
+MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
+MODULE_DESCRIPTION("Watchdog driver for Atmel AT32AP700X");
+MODULE_LICENSE("GPL");