1 files changed, 287 insertions, 0 deletions
diff --git a/target/linux/ifxmips/files/drivers/char/watchdog/danube_wdt.c b/target/linux/ifxmips/files/drivers/char/watchdog/danube_wdt.c
new file mode 100644
index 0000000000..be2b339381
--- /dev/null
+++ b/target/linux/ifxmips/files/drivers/char/watchdog/danube_wdt.c
@@ -0,0 +1,287 @@
+/*
+ *   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.
+ *
+ *   Copyright (C) 2006 infineon
+ *   Copyright (C) 2007 John Crispin <blogic@openwrt.org> 
+ *
+ */
+
+#include <asm/uaccess.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/ioctl.h>
+#include <linux/module.h>
+#include <asm-mips/danube/danube_wdt.h>
+#include <asm-mips/danube/danube.h>
+
+
+// TODO remove magic numbers and weirdo macros
+
+extern unsigned int danube_get_fpi_hz (void);
+
+static int danube_wdt_inuse = 0;
+static int danube_wdt_major = 0;
+
+int
+danube_wdt_enable (unsigned int timeout)
+{
+	unsigned int wdt_cr = 0;
+	unsigned int wdt_reload = 0;
+	unsigned int wdt_clkdiv, wdt_pwl, ffpi;
+	int retval = 0;
+
+	/* clock divider & prewarning limit */
+	wdt_clkdiv = 1 << (7 * DANUBE_BIU_WDT_CR_CLKDIV_GET(readl(DANUBE_BIU_WDT_CR)));
+	wdt_pwl = 0x8000 >> DANUBE_BIU_WDT_CR_PWL_GET(readl(DANUBE_BIU_WDT_CR));
+
+	//TODO
+	printk("WARNING FUNCTION CALL MISSING!!!");
+	//ffpi = cgu_get_io_region_clock();
+	printk("cpu clock = %d\n", ffpi);
+
+	/* caculate reload value */
+	wdt_reload = (timeout * (ffpi / wdt_clkdiv)) + wdt_pwl;
+
+	printk("wdt_pwl=0x%x, wdt_clkdiv=%d, ffpi=%d, wdt_reload = 0x%x\n",
+		wdt_pwl, wdt_clkdiv, ffpi, wdt_reload);
+
+	if (wdt_reload > 0xFFFF)
+	{
+		printk ("timeout too large %d\n", timeout);
+		retval = -EINVAL;
+		goto out;
+	}
+
+	/* Write first part of password access */
+	writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR);
+
+	wdt_cr = readl(DANUBE_BIU_WDT_CR);
+	wdt_cr &= (!DANUBE_BIU_WDT_CR_PW_SET(0xff) &
+		   !DANUBE_BIU_WDT_CR_PWL_SET(0x3) &
+		   !DANUBE_BIU_WDT_CR_CLKDIV_SET(0x3) &
+		   !DANUBE_BIU_WDT_CR_RELOAD_SET(0xffff));
+
+	wdt_cr |= (DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2) |
+		   DANUBE_BIU_WDT_CR_PWL_SET(DANUBE_BIU_WDT_CR_PWL_GET(readl(DANUBE_BIU_WDT_CR))) |
+		   DANUBE_BIU_WDT_CR_CLKDIV_SET(DANUBE_BIU_WDT_CR_CLKDIV_GET(readl(DANUBE_BIU_WDT_CR))) |
+		   DANUBE_BIU_WDT_CR_RELOAD_SET(wdt_reload) |
+		   DANUBE_BIU_WDT_CR_GEN);
+
+	writel(wdt_cr, DANUBE_BIU_WDT_CR);
+
+	printk("watchdog enabled\n");
+
+out:
+	return retval;
+}
+
+void
+danube_wdt_disable (void)
+{
+	writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR);
+	writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2), DANUBE_BIU_WDT_CR);
+
+	printk("watchdog disabled\n");
+}
+
+/* passed LPEN or DSEN */
+void
+danube_wdt_enable_feature (int en, int type)
+{
+	unsigned int wdt_cr = 0;
+
+	writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR);
+
+	wdt_cr = readl(DANUBE_BIU_WDT_CR);
+
+	if (en)
+	{
+		wdt_cr &= (~DANUBE_BIU_WDT_CR_PW_SET(0xff));
+		wdt_cr |= (DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2) | type);
+	} else {
+		wdt_cr &= (~DANUBE_BIU_WDT_CR_PW_SET(0xff) & ~type);
+		wdt_cr |= DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2);
+	}
+
+	writel(wdt_cr, DANUBE_BIU_WDT_CR);
+}
+
+void
+danube_wdt_prewarning_limit (int pwl)
+{
+	unsigned int wdt_cr = 0;
+
+	wdt_cr = readl(DANUBE_BIU_WDT_CR);
+	writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR);
+
+	wdt_cr &= 0xf300ffff;
+	wdt_cr |= (DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2) | DANUBE_BIU_WDT_CR_PWL_SET(pwl));
+
+	/* Set reload value in second password access */
+	writel(wdt_cr, DANUBE_BIU_WDT_CR);
+}
+
+void
+danube_wdt_set_clkdiv (int clkdiv)
+{
+	unsigned int wdt_cr = 0;
+
+	wdt_cr = readl(DANUBE_BIU_WDT_CR);
+	writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR);
+
+	wdt_cr &= 0xfc00ffff;
+	wdt_cr |= (DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2) | DANUBE_BIU_WDT_CR_CLKDIV_SET(clkdiv));
+
+	/* Set reload value in second password access */
+	writel(wdt_cr, DANUBE_BIU_WDT_CR);
+}
+
+static int
+danube_wdt_ioctl (struct inode *inode, struct file *file, unsigned int cmd,
+	   unsigned long arg)
+{
+	int result = 0;
+	static int timeout = -1;
+	unsigned int user_arg;
+
+	if ((cmd != DANUBE_WDT_IOC_STOP) && (cmd != DANUBE_WDT_IOC_PING) && (cmd != DANUBE_WDT_IOC_GET_STATUS))
+	{
+		if (copy_from_user((void *) &user_arg, (void *) arg, sizeof (int))){
+			result = -EINVAL;
+			goto out;
+		}
+	}
+
+	switch (cmd)
+	{
+	case DANUBE_WDT_IOC_START:
+		if ((result = danube_wdt_enable(user_arg)) < 0)
+			timeout = -1;
+		else
+			timeout = user_arg;
+		break;
+
+	case DANUBE_WDT_IOC_STOP:
+		printk("disable watch dog timer\n");
+		danube_wdt_disable();
+		break;
+
+	case DANUBE_WDT_IOC_PING:
+		if (timeout < 0)
+			result = -EIO;
+		else
+			result = danube_wdt_enable(timeout);
+		break;
+
+	case DANUBE_WDT_IOC_GET_STATUS:
+		user_arg = readl(DANUBE_BIU_WDT_SR);
+		copy_to_user((int*)arg, (int*)&user_arg, sizeof(int));
+		break;
+
+	case DANUBE_WDT_IOC_SET_PWL:
+		danube_wdt_prewarning_limit(user_arg);
+		break;
+
+	case DANUBE_WDT_IOC_SET_DSEN:
+		danube_wdt_enable_feature(user_arg, DANUBE_BIU_WDT_CR_DSEN);
+		break;
+
+	case DANUBE_WDT_IOC_SET_LPEN:
+		danube_wdt_enable_feature(user_arg, DANUBE_BIU_WDT_CR_LPEN);
+		break;
+
+	case DANUBE_WDT_IOC_SET_CLKDIV:
+		danube_wdt_set_clkdiv(user_arg);
+		break;
+
+	default:
+		printk("unknown watchdog iotcl\n");
+	}
+
+out:
+	return result;
+}
+
+static int
+danube_wdt_open (struct inode *inode, struct file *file)
+{
+	if (danube_wdt_inuse)
+		return -EBUSY;
+
+	danube_wdt_inuse = 1;
+
+	return 0;
+}
+
+static int
+danube_wdt_release (struct inode *inode, struct file *file)
+{
+	danube_wdt_inuse = 0;
+
+	return 0;
+}
+
+int
+danube_wdt_register_proc_read (char *buf, char **start, off_t offset, int count,
+			int *eof, void *data)
+{
+	int len = 0;
+
+	len += sprintf (buf + len, "DANUBE_BIU_WDT_PROC_READ\n");
+	len += sprintf (buf + len, "DANUBE_BIU_WDT_CR(0x%08x)	: 0x%08x\n",
+			(unsigned int)DANUBE_BIU_WDT_CR, readl(DANUBE_BIU_WDT_CR));
+	len += sprintf (buf + len, "DANUBE_BIU_WDT_SR(0x%08x)	: 0x%08x\n",
+			(unsigned int)DANUBE_BIU_WDT_SR, readl(DANUBE_BIU_WDT_SR));
+
+	*eof = 1;
+
+	return len;
+}
+
+static struct file_operations wdt_fops = {
+      .owner = THIS_MODULE,
+      .ioctl = danube_wdt_ioctl,
+      .open = danube_wdt_open,
+      .release = danube_wdt_release,
+};
+
+int __init
+danube_wdt_init_module (void)
+{
+	danube_wdt_major = register_chrdev(0, "wdt", &wdt_fops);
+
+	if (danube_wdt_major < 0)
+	{
+		printk("cannot register watchdog device\n");
+
+		return -EINVAL;
+	}
+
+	create_proc_read_entry("danube_wdt", 0, NULL, danube_wdt_register_proc_read, NULL);
+
+	printk("danube watchdog loaded\n");
+
+	return 0;
+}
+
+void
+danube_wdt_cleanup_module (void)
+{
+	unregister_chrdev(danube_wdt_major, "wdt");
+	remove_proc_entry("danube_wdt", NULL);
+}
+
+module_init(danube_wdt_init_module);
+module_exit(danube_wdt_cleanup_module);