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-rw-r--r--target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c b/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c
new file mode 100644
index 000000000..d631f4aac
--- /dev/null
+++ b/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c
@@ -0,0 +1,325 @@
+/*
+ * 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 <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/miscdevice.h>
+#include <asm-mips/ifxmips/ifxmips_wdt.h>
+#include <asm-mips/ifxmips/ifxmips.h>
+
+#define DRVNAME "ifxmips_wdt"
+
+// TODO remove magic numbers and weirdo macros
+extern unsigned int ifxmips_get_fpi_hz (void);
+
+static int ifxmips_wdt_inuse = 0;
+static int ifxmips_wdt_major = 0;
+
+int
+ifxmips_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 * IFXMIPS_BIU_WDT_CR_CLKDIV_GET(readl(IFXMIPS_BIU_WDT_CR)));
+ wdt_pwl = 0x8000 >> IFXMIPS_BIU_WDT_CR_PWL_GET(readl(IFXMIPS_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(KERN_WARNING DRVNAME ": 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(KERN_WARNING DRVNAME ": timeout too large %d\n", timeout);
+ retval = -EINVAL;
+ goto out;
+ }
+
+ /* Write first part of password access */
+ writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
+
+ wdt_cr = readl(IFXMIPS_BIU_WDT_CR);
+ wdt_cr &= (!IFXMIPS_BIU_WDT_CR_PW_SET(0xff) &
+ !IFXMIPS_BIU_WDT_CR_PWL_SET(0x3) &
+ !IFXMIPS_BIU_WDT_CR_CLKDIV_SET(0x3) &
+ !IFXMIPS_BIU_WDT_CR_RELOAD_SET(0xffff));
+
+ wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) |
+ IFXMIPS_BIU_WDT_CR_PWL_SET(IFXMIPS_BIU_WDT_CR_PWL_GET(readl(IFXMIPS_BIU_WDT_CR))) |
+ IFXMIPS_BIU_WDT_CR_CLKDIV_SET(IFXMIPS_BIU_WDT_CR_CLKDIV_GET(readl(IFXMIPS_BIU_WDT_CR))) |
+ IFXMIPS_BIU_WDT_CR_RELOAD_SET(wdt_reload) |
+ IFXMIPS_BIU_WDT_CR_GEN);
+
+ writel(wdt_cr, IFXMIPS_BIU_WDT_CR);
+
+ printk("watchdog enabled\n");
+
+out:
+ return retval;
+}
+
+void
+ifxmips_wdt_disable (void)
+{
+ writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
+ writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2), IFXMIPS_BIU_WDT_CR);
+
+ printk("watchdog disabled\n");
+}
+
+/* passed LPEN or DSEN */
+void
+ifxmips_wdt_enable_feature (int en, int type)
+{
+ unsigned int wdt_cr = 0;
+
+ writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
+
+ wdt_cr = readl(IFXMIPS_BIU_WDT_CR);
+
+ if (en)
+ {
+ wdt_cr &= (~IFXMIPS_BIU_WDT_CR_PW_SET(0xff));
+ wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | type);
+ } else {
+ wdt_cr &= (~IFXMIPS_BIU_WDT_CR_PW_SET(0xff) & ~type);
+ wdt_cr |= IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2);
+ }
+
+ writel(wdt_cr, IFXMIPS_BIU_WDT_CR);
+}
+
+void
+ifxmips_wdt_prewarning_limit (int pwl)
+{
+ unsigned int wdt_cr = 0;
+
+ wdt_cr = readl(IFXMIPS_BIU_WDT_CR);
+ writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
+
+ wdt_cr &= 0xf300ffff;
+ wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | IFXMIPS_BIU_WDT_CR_PWL_SET(pwl));
+
+ /* Set reload value in second password access */
+ writel(wdt_cr, IFXMIPS_BIU_WDT_CR);
+}
+
+void
+ifxmips_wdt_set_clkdiv (int clkdiv)
+{
+ unsigned int wdt_cr = 0;
+
+ wdt_cr = readl(IFXMIPS_BIU_WDT_CR);
+ writel(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR);
+
+ wdt_cr &= 0xfc00ffff;
+ wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | IFXMIPS_BIU_WDT_CR_CLKDIV_SET(clkdiv));
+
+ /* Set reload value in second password access */
+ writel(wdt_cr, IFXMIPS_BIU_WDT_CR);
+}
+
+static int
+ifxmips_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 != IFXMIPS_WDT_IOC_STOP) && (cmd != IFXMIPS_WDT_IOC_PING) && (cmd != IFXMIPS_WDT_IOC_GET_STATUS))
+ {
+ if (copy_from_user((void *) &user_arg, (void *) arg, sizeof (int))){
+ result = -EINVAL;
+ goto out;
+ }
+ }
+
+ switch (cmd)
+ {
+ case IFXMIPS_WDT_IOC_START:
+ if ((result = ifxmips_wdt_enable(user_arg)) < 0)
+ timeout = -1;
+ else
+ timeout = user_arg;
+ break;
+
+ case IFXMIPS_WDT_IOC_STOP:
+ printk(KERN_INFO DRVNAME ": disable watch dog timer\n");
+ ifxmips_wdt_disable();
+ break;
+
+ case IFXMIPS_WDT_IOC_PING:
+ if (timeout < 0)
+ result = -EIO;
+ else
+ result = ifxmips_wdt_enable(timeout);
+ break;
+
+ case IFXMIPS_WDT_IOC_GET_STATUS:
+ user_arg = readl(IFXMIPS_BIU_WDT_SR);
+ copy_to_user((int*)arg, (int*)&user_arg, sizeof(int));
+ break;
+
+ case IFXMIPS_WDT_IOC_SET_PWL:
+ ifxmips_wdt_prewarning_limit(user_arg);
+ break;
+
+ case IFXMIPS_WDT_IOC_SET_DSEN:
+ ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_DSEN);
+ break;
+
+ case IFXMIPS_WDT_IOC_SET_LPEN:
+ ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_LPEN);
+ break;
+
+ case IFXMIPS_WDT_IOC_SET_CLKDIV:
+ ifxmips_wdt_set_clkdiv(user_arg);
+ break;
+
+ default:
+ printk(KERN_WARNING DRVNAME ": unknown watchdog iotcl\n");
+ }
+
+out:
+ return result;
+}
+
+static int
+ifxmips_wdt_open (struct inode *inode, struct file *file)
+{
+ if (ifxmips_wdt_inuse)
+ return -EBUSY;
+
+ ifxmips_wdt_inuse = 1;
+
+ return 0;
+}
+
+static int
+ifxmips_wdt_release (struct inode *inode, struct file *file)
+{
+ ifxmips_wdt_inuse = 0;
+
+ return 0;
+}
+
+int
+ifxmips_wdt_register_proc_read (char *buf, char **start, off_t offset, int count,
+ int *eof, void *data)
+{
+ int len = 0;
+
+ len += sprintf (buf + len, "IFXMIPS_BIU_WDT_PROC_READ\n");
+ len += sprintf (buf + len, "IFXMIPS_BIU_WDT_CR(0x%08x) : 0x%08x\n",
+ (unsigned int)IFXMIPS_BIU_WDT_CR, readl(IFXMIPS_BIU_WDT_CR));
+ len += sprintf (buf + len, "IFXMIPS_BIU_WDT_SR(0x%08x) : 0x%08x\n",
+ (unsigned int)IFXMIPS_BIU_WDT_SR, readl(IFXMIPS_BIU_WDT_SR));
+
+ *eof = 1;
+
+ return len;
+}
+
+static const struct file_operations ifxmips_wdt_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .ioctl = ifxmips_wdt_ioctl,
+ .open = ifxmips_wdt_open,
+ .release = ifxmips_wdt_release,
+// .write = at91_wdt_write,
+};
+
+static struct miscdevice ifxmips_wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "ifxmips_wdt",
+ .fops = &ifxmips_wdt_fops,
+};
+
+
+static int
+ifxmips_wdt_probe (struct platform_device *pdev)
+{
+ int ret = misc_register(&ifxmips_wdt_miscdev);
+ if (ret)
+ return ret;
+
+ create_proc_read_entry(DRVNAME, 0, NULL, ifxmips_wdt_register_proc_read, NULL);
+
+ printk(KERN_INFO DRVNAME ": ifxmips watchdog loaded\n");
+
+ return 0;
+}
+
+static int
+ifxmips_wdt_remove (struct platform_device *pdev)
+{
+ misc_deregister(&ifxmips_wdt_miscdev);
+ remove_proc_entry(DRVNAME, NULL);
+ return 0;
+}
+
+static struct
+platform_driver ifxmips_wdt_driver = {
+ .probe = ifxmips_wdt_probe,
+ .remove = ifxmips_wdt_remove,
+ .driver = {
+ .name = DRVNAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+int __init
+ifxmips_wdt_init_module (void)
+{
+ int ret = platform_driver_register(&ifxmips_wdt_driver);
+ if (ret)
+ printk(KERN_INFO DRVNAME ": Error registering platfom driver!");
+ return ret;
+}
+
+void
+ifxmips_wdt_cleanup_module (void)
+{
+ platform_driver_unregister(&ifxmips_wdt_driver);
+}
+
+module_init(ifxmips_wdt_init_module);
+module_exit(ifxmips_wdt_cleanup_module);
+
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION("Watchdog driver for infineon ifxmips family");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);