add support for the Gateworks Laguna family (Cavium Networks Econa CNS3xxx)

SVN-Revision: 22323

1 files changed, 496 insertions, 0 deletions

diff --git a/target/linux/cns3xxx/patches-2.6.31/209-cns3xxx_watchdog_support.patch b/target/linux/cns3xxx/patches-2.6.31/209-cns3xxx_watchdog_support.patch
new file mode 100644
index 0000000000..af9a60152f
--- /dev/null
+++ b/target/linux/cns3xxx/patches-2.6.31/209-cns3xxx_watchdog_support.patch
@@ -0,0 +1,496 @@
+--- /dev/null
++++ b/drivers/watchdog/cns3xxx_wdt.c
+@@ -0,0 +1,465 @@
++/*******************************************************************************
++ *
++ *  drivers/watchdog/cns3xxx_wdt.c
++ *
++ *  Watchdog timer driver for the CNS3XXX SOCs
++ *
++ *  Author: Scott Shu
++ *
++ *  Copyright (c) 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. 
++ *
++ *  This file is distributed in the hope that it will be useful, 
++ *  but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of 
++ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or 
++ *  NONINFRINGEMENT.  See the GNU General Public License for more details. 
++ *
++ *  You should have received a copy of the GNU General Public License 
++ *  along with this file; if not, write to the Free Software 
++ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or 
++ *  visit http://www.gnu.org/licenses/. 
++ *
++ *  This file may also be available under a different license from Cavium. 
++ *  Contact Cavium Networks for more information
++ *
++ ******************************************************************************/
++
++#include <linux/module.h>
++#include <linux/moduleparam.h>
++#include <linux/types.h>
++#include <linux/miscdevice.h>
++#include <linux/watchdog.h>
++#include <linux/fs.h>
++#include <linux/reboot.h>
++#include <linux/init.h>
++#include <linux/interrupt.h>
++#include <linux/platform_device.h>
++#include <linux/io.h>
++#include <linux/uaccess.h>
++
++#include <asm/hardware/arm_twd.h>
++
++struct cns3xxx_wdt {
++	unsigned long	timer_alive;
++	struct device	*dev;
++	void __iomem	*base;
++	int		irq;
++	unsigned int	perturb;
++	char		expect_close;
++};
++
++static struct platform_device *cns3xxx_wdt_dev;
++extern unsigned int twd_timer_rate;
++static spinlock_t wdt_lock;
++
++#define TIMER_MARGIN	60
++static int cns3xxx_margin = TIMER_MARGIN;
++module_param(cns3xxx_margin, int, 0);
++MODULE_PARM_DESC(cns3xxx_margin,
++	"CNS3XXX timer margin in seconds. (0 < cns3xxx_margin < 65536, default="
++				__MODULE_STRING(TIMER_MARGIN) ")");
++
++static int nowayout = WATCHDOG_NOWAYOUT;
++module_param(nowayout, int, 0);
++MODULE_PARM_DESC(nowayout,
++	"Watchdog cannot be stopped once started (default="
++				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
++
++#define ONLY_TESTING	0
++static int cns3xxx_noboot = ONLY_TESTING;
++module_param(cns3xxx_noboot, int, 0);
++MODULE_PARM_DESC(cns3xxx_noboot, "CNS3XXX watchdog action, "
++	"set to 1 to ignore reboots, 0 to reboot (default="
++					__MODULE_STRING(ONLY_TESTING) ")");
++
++/*
++ *	This is the interrupt handler.  Note that we only use this
++ *	in testing mode, so don't actually do a reboot here.
++ */
++static irqreturn_t cns3xxx_wdt_fire(int irq, void *arg)
++{
++	struct cns3xxx_wdt *wdt = arg;
++
++	/* Check it really was our interrupt */
++	if (readl(wdt->base + TWD_WDOG_INTSTAT)) {
++		dev_printk(KERN_CRIT, wdt->dev,
++					"Triggered - Reboot ignored.\n");
++		/* Clear the interrupt on the watchdog */
++		writel(1, wdt->base + TWD_WDOG_INTSTAT);
++		return IRQ_HANDLED;
++	}
++	return IRQ_NONE;
++}
++
++/*
++ *	cns3xxx_wdt_keepalive - reload the timer
++ *
++ *	Note that the spec says a DIFFERENT value must be written to the reload
++ *	register each time.  The "perturb" variable deals with this by adding 1
++ *	to the count every other time the function is called.
++ */
++static void cns3xxx_wdt_keepalive(struct cns3xxx_wdt *wdt)
++{
++	unsigned int count;
++
++	/* Assume prescale is set to 256 */
++	count = (twd_timer_rate / 256) * cns3xxx_margin;
++
++	/* Reload the counter */
++	spin_lock(&wdt_lock);
++	writel(count + wdt->perturb, wdt->base + TWD_WDOG_LOAD);
++	wdt->perturb = wdt->perturb ? 0 : 1;
++	spin_unlock(&wdt_lock);
++}
++
++static void cns3xxx_wdt_stop(struct cns3xxx_wdt *wdt)
++{
++	spin_lock(&wdt_lock);
++	writel(0x12345678, wdt->base + TWD_WDOG_DISABLE);
++	writel(0x87654321, wdt->base + TWD_WDOG_DISABLE);
++	writel(0x0, wdt->base + TWD_WDOG_CONTROL);
++	spin_unlock(&wdt_lock);
++}
++
++static void cns3xxx_wdt_start(struct cns3xxx_wdt *wdt)
++{
++	dev_printk(KERN_INFO, wdt->dev, "enabling watchdog.\n");
++
++	//spin_lock(&wdt_lock);
++	/* This loads the count register but does NOT start the count yet */
++	cns3xxx_wdt_keepalive(wdt);
++	spin_lock(&wdt_lock);
++
++	if (cns3xxx_noboot) {
++		/* Enable watchdog - prescale=256, watchdog mode=0, enable=1 */
++		writel(0x0000FF01, wdt->base + TWD_WDOG_CONTROL);
++	} else {
++		/* Enable watchdog - prescale=256, watchdog mode=1, enable=1 */
++		writel(0x0000FF09, wdt->base + TWD_WDOG_CONTROL);
++	}
++	spin_unlock(&wdt_lock);
++}
++
++static int cns3xxx_wdt_set_heartbeat(int t)
++{
++	if (t < 0x0001 || t > 0xFFFF)
++		return -EINVAL;
++
++	cns3xxx_margin = t;
++	return 0;
++}
++
++/*
++ *	/dev/watchdog handling
++ */
++static int cns3xxx_wdt_open(struct inode *inode, struct file *file)
++{
++	struct cns3xxx_wdt *wdt = platform_get_drvdata(cns3xxx_wdt_dev);
++
++	if (test_and_set_bit(0, &wdt->timer_alive))
++		return -EBUSY;
++
++	if (nowayout)
++		__module_get(THIS_MODULE);
++
++	file->private_data = wdt;
++
++	/*
++	 *	Activate timer
++	 */
++	cns3xxx_wdt_start(wdt);
++
++	return nonseekable_open(inode, file);
++}
++
++static int cns3xxx_wdt_release(struct inode *inode, struct file *file)
++{
++	struct cns3xxx_wdt *wdt = file->private_data;
++
++	/*
++	 *	Shut off the timer.
++	 * 	Lock it in if it's a module and we set nowayout
++	 */
++	if (wdt->expect_close == 42)
++		cns3xxx_wdt_stop(wdt);
++	else {
++		dev_printk(KERN_CRIT, wdt->dev,
++				"unexpected close, not stopping watchdog!\n");
++		cns3xxx_wdt_keepalive(wdt);
++	}
++	clear_bit(0, &wdt->timer_alive);
++	wdt->expect_close = 0;
++	return 0;
++}
++
++static ssize_t cns3xxx_wdt_write(struct file *file, const char *data,
++						size_t len, loff_t *ppos)
++{
++	struct cns3xxx_wdt *wdt = file->private_data;
++
++	/*
++	 *	Refresh the timer.
++	 */
++	if (len) {
++		if (!nowayout) {
++			size_t i;
++
++			/* In case it was set long ago */
++			wdt->expect_close = 0;
++
++			for (i = 0; i != len; i++) {
++				char c;
++
++				if (get_user(c, data + i))
++					return -EFAULT;
++				if (c == 'V')
++					wdt->expect_close = 42;
++			}
++		}
++		cns3xxx_wdt_keepalive(wdt);
++	}
++	return len;
++}
++
++static struct watchdog_info ident = {
++	.options		= WDIOF_SETTIMEOUT |
++				  WDIOF_KEEPALIVEPING |
++				  WDIOF_MAGICCLOSE,
++	.identity		= "CNS3XXX Watchdog",
++};
++
++static long cns3xxx_wdt_ioctl(struct file *file, unsigned int cmd,
++							unsigned long arg)
++{
++	struct cns3xxx_wdt *wdt = file->private_data;
++	int ret;
++	union {
++		struct watchdog_info ident;
++		int i;
++	} uarg;
++
++	if (_IOC_DIR(cmd) && _IOC_SIZE(cmd) > sizeof(uarg))
++		return -ENOTTY;
++
++	if (_IOC_DIR(cmd) & _IOC_WRITE) {
++		ret = copy_from_user(&uarg, (void __user *)arg, _IOC_SIZE(cmd));
++		if (ret)
++			return -EFAULT;
++	}
++
++	switch (cmd) {
++	case WDIOC_GETSUPPORT:
++		uarg.ident = ident;
++		ret = 0;
++		break;
++
++	case WDIOC_GETSTATUS:
++	case WDIOC_GETBOOTSTATUS:
++		uarg.i = 0;
++		ret = 0;
++		break;
++
++	case WDIOC_SETOPTIONS:
++		ret = -EINVAL;
++		if (uarg.i & WDIOS_DISABLECARD) {
++			cns3xxx_wdt_stop(wdt);
++			ret = 0;
++		}
++		if (uarg.i & WDIOS_ENABLECARD) {
++			cns3xxx_wdt_start(wdt);
++			ret = 0;
++		}
++		break;
++
++	case WDIOC_KEEPALIVE:
++		cns3xxx_wdt_keepalive(wdt);
++		ret = 0;
++		break;
++
++	case WDIOC_SETTIMEOUT:
++		ret = cns3xxx_wdt_set_heartbeat(uarg.i);
++		if (ret)
++			break;
++
++		cns3xxx_wdt_keepalive(wdt);
++		/* Fall */
++	case WDIOC_GETTIMEOUT:
++		uarg.i = cns3xxx_margin;
++		ret = 0;
++		break;
++
++	default:
++		return -ENOTTY;
++	}
++
++	if (ret == 0 && _IOC_DIR(cmd) & _IOC_READ) {
++		ret = copy_to_user((void __user *)arg, &uarg, _IOC_SIZE(cmd));
++		if (ret)
++			ret = -EFAULT;
++	}
++	return ret;
++}
++
++/*
++ *	System shutdown handler.  Turn off the watchdog if we're
++ *	restarting or halting the system.
++ */
++static void cns3xxx_wdt_shutdown(struct platform_device *dev)
++{
++	struct cns3xxx_wdt *wdt = platform_get_drvdata(dev);
++
++	if (system_state == SYSTEM_RESTART || system_state == SYSTEM_HALT)
++		cns3xxx_wdt_stop(wdt);
++}
++
++/*
++ *	Kernel Interfaces
++ */
++static const struct file_operations cns3xxx_wdt_fops = {
++	.owner		= THIS_MODULE,
++	.llseek		= no_llseek,
++	.write		= cns3xxx_wdt_write,
++	.unlocked_ioctl	= cns3xxx_wdt_ioctl,
++	.open		= cns3xxx_wdt_open,
++	.release	= cns3xxx_wdt_release,
++};
++
++static struct miscdevice cns3xxx_wdt_miscdev = {
++	.minor		= WATCHDOG_MINOR,
++	.name		= "watchdog",
++	.fops		= &cns3xxx_wdt_fops,
++};
++
++static int __devinit cns3xxx_wdt_probe(struct platform_device *dev)
++{
++	struct cns3xxx_wdt *wdt;
++	struct resource *res;
++	int ret;
++
++	/* We only accept one device, and it must have an id of -1 */
++	if (dev->id != -1)
++		return -ENODEV;
++
++	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
++	if (!res) {
++		ret = -ENODEV;
++		goto err_out;
++	}
++
++	wdt = kzalloc(sizeof(struct cns3xxx_wdt), GFP_KERNEL);
++	if (!wdt) {
++		ret = -ENOMEM;
++		goto err_out;
++	}
++
++	wdt->dev = &dev->dev;
++	wdt->irq = platform_get_irq(dev, 0);
++	if (wdt->irq < 0) {
++		ret = -ENXIO;
++		goto err_free;
++	}
++	wdt->base = ioremap(res->start, res->end - res->start + 1);
++	if (!wdt->base) {
++		ret = -ENOMEM;
++		goto err_free;
++	}
++
++	cns3xxx_wdt_miscdev.parent = &dev->dev;
++	ret = misc_register(&cns3xxx_wdt_miscdev);
++	if (ret) {
++		dev_printk(KERN_ERR, wdt->dev,
++			"cannot register miscdev on minor=%d (err=%d)\n",
++							WATCHDOG_MINOR, ret);
++		goto err_misc;
++	}
++
++	ret = request_irq(wdt->irq, cns3xxx_wdt_fire, IRQF_DISABLED,
++			dev->name, wdt);
++	if (ret) {
++		dev_printk(KERN_ERR, wdt->dev,
++			"cannot register IRQ%d for watchdog\n", wdt->irq);
++		goto err_irq;
++	}
++
++	cns3xxx_wdt_stop(wdt);
++	platform_set_drvdata(dev, wdt);
++	cns3xxx_wdt_dev = dev;
++
++	return 0;
++
++err_irq:
++	misc_deregister(&cns3xxx_wdt_miscdev);
++err_misc:
++	platform_set_drvdata(dev, NULL);
++	iounmap(wdt->base);
++err_free:
++	kfree(wdt);
++err_out:
++	return ret;
++}
++
++static int __devexit cns3xxx_wdt_remove(struct platform_device *dev)
++{
++	struct cns3xxx_wdt *wdt = platform_get_drvdata(dev);
++
++	platform_set_drvdata(dev, NULL);
++
++	misc_deregister(&cns3xxx_wdt_miscdev);
++
++	cns3xxx_wdt_dev = NULL;
++
++	free_irq(wdt->irq, wdt);
++	iounmap(wdt->base);
++	kfree(wdt);
++	return 0;
++}
++
++
++static struct platform_driver cns3xxx_wdt_driver = {
++	.probe		= cns3xxx_wdt_probe,
++	.remove		= __devexit_p(cns3xxx_wdt_remove),
++	.shutdown	= cns3xxx_wdt_shutdown,
++	.driver		= {
++		.owner	= THIS_MODULE,
++		.name	= "cns3xxx-wdt",
++	},
++};
++
++static char banner[] __initdata = KERN_INFO
++		"CNS3XXX Watchdog Timer, noboot=%d margin=%d sec (nowayout= %d)\n";
++
++static int __init cns3xxx_wdt_init(void)
++{
++	/*
++	 * Check that the margin value is within it's range;
++	 * if not reset to the default
++	 */
++	if (cns3xxx_wdt_set_heartbeat(cns3xxx_margin)) {
++		cns3xxx_wdt_set_heartbeat(TIMER_MARGIN);
++		printk(KERN_INFO "cns3xxx_margin value must be 0 < cns3xxx_margin < 65536, using %d\n",
++			TIMER_MARGIN);
++	}
++
++	printk(banner, cns3xxx_noboot, cns3xxx_margin, nowayout);
++
++	spin_lock_init(&wdt_lock);
++
++	return platform_driver_register(&cns3xxx_wdt_driver);
++}
++
++static void __exit cns3xxx_wdt_exit(void)
++{
++	platform_driver_unregister(&cns3xxx_wdt_driver);
++}
++
++module_init(cns3xxx_wdt_init);
++module_exit(cns3xxx_wdt_exit);
++
++MODULE_AUTHOR("Scott Shu");
++MODULE_DESCRIPTION("CNS3XXX Watchdog Device Driver");
++MODULE_LICENSE("GPL");
++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
++MODULE_ALIAS("platform:cns3xxx-wdt");
+--- a/drivers/watchdog/Kconfig
++++ b/drivers/watchdog/Kconfig
+@@ -231,6 +231,15 @@ config DAVINCI_WATCHDOG
+ 	  NOTE: once enabled, this timer cannot be disabled.
+ 	  Say N if you are unsure.
+ 
++config CNS3XXX_WATCHDOG
++	tristate "CNS3XXX watchdog"
++	depends on ARCH_CNS3XXX && LOCAL_TIMERS
++	help
++	  Watchdog timer embedded into the CNS3XXX SoCs system.
++
++	  To compile this driver as a module, choose M here: the
++	  module will be called cns3xxx_wdt.
++
+ config ORION_WATCHDOG
+ 	tristate "Orion watchdog"
+ 	depends on ARCH_ORION5X || ARCH_KIRKWOOD
+--- a/drivers/watchdog/Makefile
++++ b/drivers/watchdog/Makefile
+@@ -41,6 +41,7 @@ obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_
+ obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
+ obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o
+ obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
++obj-$(CONFIG_CNS3XXX_WATCHDOG) += cns3xxx_wdt.o
+ obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
+ obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
+ obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o