summaryrefslogtreecommitdiffstats
path: root/target/linux/danube/files/drivers/char
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/danube/files/drivers/char')
-rw-r--r--target/linux/danube/files/drivers/char/watchdog/danube_wdt.c361
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 000000000..036a4ece4
--- /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);