[rdc] add a new southbridge driver which registers the gpio and watchdog platform devices

This also fixes the watchdog logic and abstracts the access to the RDC321x
southbridge PCI configuration register space. Based on a patch by Bernhard Loos.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19972 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 278 insertions, 0 deletions

diff --git a/target/linux/rdc/files-2.6.30/drivers/watchdog/rdc321x_wdt.c b/target/linux/rdc/files-2.6.30/drivers/watchdog/rdc321x_wdt.c
new file mode 100644
index 0000000000..9e8b0372d2
--- /dev/null
+++ b/target/linux/rdc/files-2.6.30/drivers/watchdog/rdc321x_wdt.c
@@ -0,0 +1,278 @@
+/*
+ * RDC321x watchdog driver
+ *
+ * Copyright (C) 2007-2010 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/timer.h>
+#include <linux/watchdog.h>
+#include <linux/uaccess.h>
+#include <linux/pci.h>
+
+#include <asm/rdc321x_defs.h>
+
+extern int rdc321x_pci_write(int reg, u32 val);
+extern int rdc321x_pci_read(int reg, u32 *val);
+
+#define RDC321X_WDT_REG	0x00000044
+
+#define RDC_WDT_EN	0x00800000 /* Enable bit */
+#define RDC_WDT_WDTIRQ	0x00400000 /* Create WDT IRQ before CPU reset */
+#define RDC_WDT_NMIIRQ	0x00200000 /* Create NMI IRQ before CPU reset */
+#define RDC_WDT_RST	0x00100000 /* Reset wdt */
+#define RDC_WDT_NIF	0x00080000 /* NMI interrupt occured */
+#define RDC_WDT_WIF	0x00040000 /* WDT interrupt occured */
+#define RDC_WDT_IRT	0x00000700 /* IRQ Routing table */
+#define RDC_WDT_CNT	0x0000007F /* WDT count */
+
+/* default counter value (2.34 s) */
+#define RDC_WDT_DFLT_CNT 0x00000040
+
+#define RDC_WDT_SETUP (RDC_WDT_EN | RDC_WDT_NMIIRQ | RDC_WDT_RST | RDC_WDT_DFLT_CNT)
+
+/* some device data */
+static struct {
+	struct timer_list timer;
+	int seconds_left;
+	int total_seconds;
+	bool inuse;
+	bool running;
+	bool close_expected;
+} rdc321x_wdt_dev;
+
+static struct watchdog_info ident = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+	.identity = "RDC321x WDT",
+};
+
+/* generic helper functions */
+static void rdc321x_wdt_timer(unsigned long unused)
+{
+	if (!rdc321x_wdt_dev.running) {
+		rdc321x_pci_write(RDC321X_WDT_REG, 0);
+		return;
+	}
+
+	rdc321x_wdt_dev.seconds_left--;
+
+	if (rdc321x_wdt_dev.seconds_left < 1)
+		return;
+
+	rdc321x_pci_write(RDC321X_WDT_REG, RDC_WDT_SETUP);
+
+	mod_timer(&rdc321x_wdt_dev.timer, HZ * 2 + jiffies);
+}
+
+static void rdc321x_wdt_reset(void)
+{
+	rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds;
+}
+
+static void rdc321x_wdt_start(void)
+{
+	if (rdc321x_wdt_dev.running)
+		return;
+
+	rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds;
+
+	rdc321x_wdt_dev.running = true;
+
+	rdc321x_wdt_timer(0);
+
+	return;
+}
+
+static int rdc321x_wdt_stop(void)
+{
+	if (WATCHDOG_NOWAYOUT)
+		return -ENOSYS;
+
+	rdc321x_wdt_dev.running = false;
+
+	return 0;
+}
+
+/* filesystem operations */
+static int rdc321x_wdt_open(struct inode *inode, struct file *file)
+{
+	if (xchg(&rdc321x_wdt_dev.inuse, true))
+		return -EBUSY;
+
+	return nonseekable_open(inode, file);
+}
+
+static int rdc321x_wdt_release(struct inode *inode, struct file *file)
+{
+	if (rdc321x_wdt_dev.close_expected)
+		rdc321x_wdt_stop();
+
+	rdc321x_wdt_dev.inuse = false;
+
+	return 0;
+}
+
+static long rdc321x_wdt_ioctl(struct file *file, unsigned int cmd,
+				unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int value;
+
+	switch (cmd) {
+		case WDIOC_KEEPALIVE:
+			rdc321x_wdt_reset();
+			break;
+		case WDIOC_GETSUPPORT:
+			if (copy_to_user(argp, &ident, sizeof(ident)))
+				return -EFAULT;
+			break;
+		case WDIOC_SETTIMEOUT:
+			if (copy_from_user(&rdc321x_wdt_dev.total_seconds, argp, sizeof(int)))
+				return -EFAULT;
+			rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds;
+			break;
+		case WDIOC_GETTIMEOUT:
+			if (copy_to_user(argp, &rdc321x_wdt_dev.total_seconds, sizeof(int)))
+				return -EFAULT;
+			break;
+		case WDIOC_GETTIMELEFT:
+			if (copy_to_user(argp, &rdc321x_wdt_dev.seconds_left, sizeof(int)))
+				return -EFAULT;
+			break;
+		case WDIOC_SETOPTIONS:
+			if (copy_from_user(&value, argp, sizeof(int)))
+				return -EFAULT;
+			switch (value) {
+				case WDIOS_ENABLECARD:
+					rdc321x_wdt_start();
+					break;
+				case WDIOS_DISABLECARD:
+					return rdc321x_wdt_stop();
+			default:
+				return -EINVAL;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	size_t i;
+ 
+	if (!count)
+		return -EIO;
+
+	rdc321x_wdt_dev.close_expected = false;
+
+	for (i = 0; i != count; i++) {
+		char c;
+
+		if (get_user(c, buf + i))
+			return -EFAULT;
+
+		if (c == 'V') {
+			rdc321x_wdt_dev.close_expected = true;
+			break;
+		}
+	}
+
+	rdc321x_wdt_reset();
+
+	return count;
+}
+
+static const struct file_operations rdc321x_wdt_fops = {
+	.llseek		= no_llseek,
+	.unlocked_ioctl	= rdc321x_wdt_ioctl,
+	.open		= rdc321x_wdt_open,
+	.write		= rdc321x_wdt_write,
+	.release	= rdc321x_wdt_release,
+};
+
+static struct miscdevice rdc321x_wdt_misc = {
+	.minor	= WATCHDOG_MINOR,
+	.name	= "watchdog",
+	.fops	= &rdc321x_wdt_fops,
+};
+
+static int __init rdc321x_wdt_probe(struct platform_device *pdev)
+{
+	int err;
+
+	err = rdc321x_pci_write(RDC321X_WDT_REG, 0);
+	if (err)
+		return err;
+
+	rdc321x_wdt_dev.running = false;
+	rdc321x_wdt_dev.close_expected = false;
+	rdc321x_wdt_dev.inuse = 0;
+	setup_timer(&rdc321x_wdt_dev.timer, rdc321x_wdt_timer, 0);
+	rdc321x_wdt_dev.total_seconds = 100;
+
+	err = misc_register(&rdc321x_wdt_misc);
+	if (err < 0) {
+		printk(KERN_ERR PFX "watchdog: misc_register failed\n");
+		return err;
+	}
+
+	panic_on_unrecovered_nmi = 1;
+	dev_info(&pdev->dev, "watchdog inig success\n");
+
+	return 0;
+}
+
+static int __devexit rdc321x_wdt_remove(struct platform_device *pdev)
+{
+	if (rdc321x_wdt_dev.inuse)
+		rdc321x_wdt_dev.inuse = 0;
+	misc_deregister(&rdc321x_wdt_misc);
+	return 0;
+}
+
+static struct platform_driver rdc321x_wdt_driver = {
+	.driver.name	= "rdc321x-wdt",
+	.driver.owner	= THIS_MODULE,
+	.probe		= rdc321x_wdt_probe,
+	.remove		= __devexit_p(rdc321x_wdt_remove),
+};
+
+static int __init rdc321x_wdt_init(void)
+{
+	return platform_driver_register(&rdc321x_wdt_driver);
+}
+
+static void __exit rdc321x_wdt_exit(void)
+{
+	platform_driver_unregister(&rdc321x_wdt_driver);
+}
+
+module_init(rdc321x_wdt_init);
+module_exit(rdc321x_wdt_exit);
+
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_DESCRIPTION("RDC321x Watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rdc321x-wdt");