branch Attitude Adjustment

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@33625 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 207 insertions, 0 deletions

diff --git a/target/linux/mcs814x/files-3.3/drivers/watchdog/mcs814x_wdt.c b/target/linux/mcs814x/files-3.3/drivers/watchdog/mcs814x_wdt.c
new file mode 100644
index 000000000..ca69e8f95
--- /dev/null
+++ b/target/linux/mcs814x/files-3.3/drivers/watchdog/mcs814x_wdt.c
@@ -0,0 +1,207 @@
+/*
+ * Moschip MCS814x Watchdog driver
+ *
+ * Copyright (C) 2012, Florian Fainelli <florian@openwrt.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
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+
+#define WDT_COUNT	0x00
+#define WDT_CTRL	0x04
+#define  WDT_CTRL_EN	0x1
+
+/* watchdog frequency */
+#define WDT_MAX_VALUE	(0xffffffff)
+
+struct mcs814x_wdt {
+	void __iomem		*regs;
+	spinlock_t		lock;
+	struct watchdog_device	wdt_dev;
+	struct clk		*clk;
+};
+
+static int mcs814x_wdt_start(struct watchdog_device *dev)
+{
+	struct mcs814x_wdt *wdt = watchdog_get_drvdata(dev);
+	u32 reg;
+
+	spin_lock(&wdt->lock);
+	reg = readl_relaxed(wdt->regs + WDT_CTRL);
+	reg |= WDT_CTRL_EN;
+	writel_relaxed(reg, wdt->regs + WDT_CTRL);
+	spin_unlock(&wdt->lock);
+
+	return 0;
+}
+
+static int mcs814x_wdt_stop(struct watchdog_device *dev)
+{
+	struct mcs814x_wdt *wdt = watchdog_get_drvdata(dev);
+	u32 reg;
+
+	spin_lock(&wdt->lock);
+	reg = readl_relaxed(wdt->regs + WDT_CTRL);
+	reg &= ~WDT_CTRL_EN;
+	writel_relaxed(reg, wdt->regs + WDT_CTRL);
+	spin_unlock(&wdt->lock);
+
+	return 0;
+}
+
+static int mcs814x_wdt_set_timeout(struct watchdog_device *dev,
+				unsigned int new_timeout)
+{
+	struct mcs814x_wdt *wdt = watchdog_get_drvdata(dev);
+
+	spin_lock(&wdt->lock);
+	/* watchdog counts upward and rollover (0xfffffff -> 0)
+	 * triggers the reboot
+	 */
+	writel_relaxed(WDT_MAX_VALUE - (new_timeout * clk_get_rate(wdt->clk)),
+		wdt->regs + WDT_COUNT);
+	spin_unlock(&wdt->lock);
+
+	return 0;
+}
+
+static int mcs814x_wdt_ping(struct watchdog_device *dev)
+{
+	/* restart the watchdog */
+	mcs814x_wdt_stop(dev);
+	mcs814x_wdt_set_timeout(dev, dev->timeout);
+	mcs814x_wdt_start(dev);
+
+	return 0;
+}
+
+static const struct watchdog_info mcs814x_wdt_ident = {
+	.options	= WDIOF_CARDRESET | WDIOF_SETTIMEOUT |
+			  WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
+	.identity	= "MCS814x Watchdog",
+};
+
+static struct watchdog_ops mcs814x_wdt_ops = {
+	.owner		= THIS_MODULE,
+	.start		= mcs814x_wdt_start,
+	.stop		= mcs814x_wdt_stop,
+	.set_timeout	= mcs814x_wdt_set_timeout,
+	.ping		= mcs814x_wdt_ping,
+};
+
+static int __devinit mcs814x_wdt_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct mcs814x_wdt *wdt;
+	int ret;
+	struct clk *clk;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+
+	clk = clk_get(NULL, "wdt");
+	if (IS_ERR_OR_NULL(clk)) {
+		dev_err(&pdev->dev, "failed to get watchdog clock\n");
+		return PTR_ERR(clk);
+	}
+
+	wdt = kzalloc(sizeof(*wdt), GFP_KERNEL);
+	if (!wdt) {
+		ret = -ENOMEM;
+		goto out_clk;
+	}
+
+	spin_lock_init(&wdt->lock);
+	wdt->clk = clk;
+	wdt->wdt_dev.info = &mcs814x_wdt_ident;
+	wdt->wdt_dev.ops = &mcs814x_wdt_ops;
+	wdt->wdt_dev.min_timeout = 1;
+	/* approximately 10995 secs */
+	wdt->wdt_dev.max_timeout = (WDT_MAX_VALUE / clk_get_rate(clk));
+
+	platform_set_drvdata(pdev, wdt);
+
+	/* only ioremap registers, because the register is shared */
+	wdt->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (!wdt->regs) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	watchdog_set_drvdata(&wdt->wdt_dev, wdt);
+
+	ret = watchdog_register_device(&wdt->wdt_dev);
+	if (ret) {
+		dev_err(&pdev->dev, "cannot register watchdog: %d\n", ret);
+		goto out;
+	}
+
+	dev_info(&pdev->dev, "registered\n");
+	return 0;
+
+out:
+	platform_set_drvdata(pdev, NULL);
+	kfree(wdt);
+out_clk:
+	clk_put(clk);
+	return ret;
+}
+
+static int __devexit mcs814x_wdt_remove(struct platform_device *pdev)
+{
+	struct mcs814x_wdt *wdt = platform_get_drvdata(pdev);
+
+	clk_put(wdt->clk);
+	watchdog_unregister_device(&wdt->wdt_dev);
+	watchdog_set_drvdata(&wdt->wdt_dev, NULL);
+	kfree(wdt);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static const struct of_device_id mcs814x_wdt_ids[] = {
+	{ .compatible = "moschip,mcs814x-wdt", },
+	{ /* sentinel */ },
+};
+
+static struct platform_driver mcs814x_wdt_driver = {
+	.driver	= {
+		.name	= "mcs814x-wdt",
+		.owner	= THIS_MODULE,
+		.of_match_table = mcs814x_wdt_ids,
+	},
+	.probe		= mcs814x_wdt_probe,
+	.remove		= __devexit_p(mcs814x_wdt_remove),
+};
+
+module_platform_driver(mcs814x_wdt_driver);
+
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_DESCRIPTION("Moschip MCS814x Watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS("platform:mcs814x-wdt");