initial merge of danube wdt code

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@9727 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 361 insertions, 0 deletions

diff --git a/target/linux/danube/files/drivers/char/watchdog/danube_wdt.c b/target/linux/danube/files/drivers/char/watchdog/danube_wdt.c
new file mode 100644
index 0000000000..036a4ece49
--- /dev/null
+++ b/target/linux/danube/files/drivers/char/watchdog/danube_wdt.c
@@ -0,0 +1,361 @@
+/*
+ *   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 <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/tty.h>
+#include <linux/selection.h>
+#include <linux/kmod.h>
+#include <linux/vmalloc.h>
+#include <linux/kdev_t.h>
+#include <linux/ioctl.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm-mips/danube/danube_wdt.h>
+#include <asm-mips/danube/danube.h>
+
+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, clkdiv, wdt_pwl, pwl, ffpi;
+
+	/* clock divider & prewarning limit */
+	switch (clkdiv = DANUBE_BIU_WDT_CR_CLKDIV_GET(readl(DANUBE_BIU_WDT_CR)))
+	{
+	case 0:
+		wdt_clkdiv = 1;
+		break;
+	case 1:
+		wdt_clkdiv = 64;
+		break;
+	case 2:
+		wdt_clkdiv = 4096;
+		break;
+	case 3:
+		wdt_clkdiv = 262144;
+		break;
+	}
+
+	switch (pwl = DANUBE_BIU_WDT_CR_PWL_GET (readl(DANUBE_BIU_WDT_CR)))
+	{
+	case 0:
+		wdt_pwl = 0x8000;
+		break;
+	case 1:
+		wdt_pwl = 0x4000;
+		break;
+	case 2:
+		wdt_pwl = 0x2000;
+		break;
+	case 3:
+		wdt_pwl = 0x1000;
+		break;
+	}
+
+	//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);
+		return -EINVAL;
+	}
+
+	/* Write first part of password access */
+	*DANUBE_BIU_WDT_CR = DANUBE_BIU_WDT_CR_PW_SET (DANUBE_WDT_PW1);
+
+	wdt_cr = *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 (pwl) |
+		   DANUBE_BIU_WDT_CR_CLKDIV_SET (clkdiv) |
+		   DANUBE_BIU_WDT_CR_RELOAD_SET (wdt_reload) |
+		   DANUBE_BIU_WDT_CR_GEN);
+
+	/* Set reload value in second password access */
+	*DANUBE_BIU_WDT_CR = wdt_cr;
+	printk ("enabled\n");
+	return 0;
+}
+
+void
+danube_wdt_disable (void)
+{
+	/* Write first part of password access */
+	writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW1), DANUBE_BIU_WDT_CR);
+
+	/* Disable the watchdog in second password access (GEN=0) */
+	writel(DANUBE_BIU_WDT_CR_PW_SET(DANUBE_WDT_PW2), DANUBE_BIU_WDT_CR);
+}
+
+void
+danube_wdt_low_power (int en)
+{
+	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) |
+			 DANUBE_BIU_WDT_CR_LPEN);
+	}
+	else {
+		wdt_cr &= (!DANUBE_BIU_WDT_CR_PW_SET (0xff) &
+			   !DANUBE_BIU_WDT_CR_LPEN);
+		wdt_cr |= DANUBE_BIU_WDT_CR_PW_SET (DANUBE_WDT_PW2);
+	}
+
+	/* Set reload value in second password access */
+	writel(wdt_cr, DANUBE_BIU_WDT_CR);
+}
+
+void
+danube_wdt_debug_suspend (int en)
+{
+	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) |
+			 DANUBE_BIU_WDT_CR_DSEN);
+	}
+	else {
+		wdt_cr &= (!DANUBE_BIU_WDT_CR_PW_SET (0xff) &
+			   !DANUBE_BIU_WDT_CR_DSEN);
+		wdt_cr |= DANUBE_BIU_WDT_CR_PW_SET (DANUBE_WDT_PW2);
+	}
+
+	/* Set reload value in second password access */
+	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 &= 0xff00ffff;	//(!DANUBE_BIU_WDT_CR_PW_SET(0xff));
+	wdt_cr &= 0xf3ffffff;	//(!DANUBE_BIU_WDT_CR_PWL_SET(3));
+	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 &= 0xff00ffff;	//(!DANUBE_BIU_WDT_CR_PW_SET(0xff));
+	wdt_cr &= 0xfcffffff;	//(!DANUBE_BIU_WDT_CR_CLKDIV_SET(3));
+	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;
+	int en = 0;
+	int istatus;
+	int pwl, clkdiv;
+	static int timeout = -1;
+
+	switch (cmd)
+	{
+	case DANUBE_WDT_IOC_START:
+		printk("enable watch dog timer!\n");
+		if (copy_from_user((void *) &timeout, (void *) arg, sizeof (int)))
+		{
+			printk ("invalid argument\n");
+			result = -EINVAL;
+		} else {
+			if ((result = danube_wdt_enable (timeout)) < 0)
+				timeout = -1;
+		}
+		break;
+
+	case DANUBE_WDT_IOC_STOP:
+		printk("disable watch dog timer\n");
+		timeout = -1;
+		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_SET_PWL:
+		if (copy_from_user((void *) &pwl, (void *) arg, sizeof (int)))
+			result = -EINVAL;
+		danube_wdt_prewarning_limit(pwl);
+		break;
+
+	case DANUBE_WDT_IOC_SET_DSEN:
+		if (copy_from_user((void *) &en, (void *) arg, sizeof (int)))
+			result = -EINVAL;
+		danube_wdt_debug_suspend (en);
+		break;
+
+	case DANUBE_WDT_IOC_SET_LPEN:
+		if (copy_from_user((void *) &en, (void *) arg, sizeof (int)))
+			result = -EINVAL;
+		danube_wdt_low_power(en);
+		break;
+
+	case DANUBE_WDT_IOC_SET_CLKDIV:
+		if (copy_from_user((void *) &clkdiv, (void *) arg, sizeof (int)))
+			result = -EINVAL;
+		danube_wdt_set_clkdiv (clkdiv);
+		break;
+
+	case DANUBE_WDT_IOC_GET_STATUS:
+		istatus = readl(DANUBE_BIU_WDT_SR);
+		copy_to_user((int *) arg, (int *) &istatus, sizeof (int));
+		break;
+	}
+
+	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);