--- /dev/null
+/*
+ * linux/drivers/char/omap1610_wdt.c
+ *
+ * Watchdog driver for the TI OMAP
+ *
+ * Author: MontaVista Software, Inc.
+ * <gdavis@mvista.com> or <source@mvista.com>
+ *
+ * 2003 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * History:
+ *
+ * 20030527: George G. Davis <gdavis@mvista.com>
+ * Initially based on linux-2.4.19-rmk7-pxa1/drivers/char/sa1100_wdt.c
+ * (c) Copyright 2000 Oleg Drokin <green@crimea.edu>
+ * Based on SoftDog driver by Alan Cox <alan@redhat.com>
+ *
+ * Copyright (c) 2004 Texas Instruments.
+ *
+ * 1. Modified to support OMAP1610 32-KHz watchdog timer
+ * 2. Ported to 2.6 kernel
+ *
+ *
+ * TODO:
+ * 1. Need to disable watchdog when entering chip idle mode.
+ */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/reboot.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/hardware.h>
+#include <asm/bitops.h>
+#include <asm/hardware/clock.h>
+
+#include <linux/moduleparam.h>
+#include "omap1610_wdt.h"
+
+static int timer_margin; /* in seconds */
+static int pre_margin;
+static int omap_wdt_users;
+static struct clk *armwdt_ck = 0;
+static struct miscdevice omap_wdt_miscdev; /* Forward declaration */
+
+static unsigned int wdt_trgr_pattern = 0x1234;
+
+static void
+omap_wdt_ping(void)
+{
+ while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08) ; /* wait for posted write to complete */
+ wdt_trgr_pattern = ~wdt_trgr_pattern;
+ omap_writel(wdt_trgr_pattern, (OMAP_WATCHDOG_TGR));
+ while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08) ; /* wait for posted write to complete */
+ return;
+}
+
+static void
+omap_wdt_enable(void)
+{
+ /* Sequence to enable the watchdog */
+ omap_writel(0xBBBB, OMAP_WATCHDOG_SPR);
+ while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10) ;
+ omap_writel(0x4444, OMAP_WATCHDOG_SPR);
+ while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10) ;
+ return;
+}
+
+static void
+omap_wdt_disable(void)
+{
+ /* sequence required to disable watchdog */
+ omap_writel(0xAAAA, OMAP_WATCHDOG_SPR); /* TIMER_MODE */
+ while (omap_readl(OMAP_WATCHDOG_WPS) & 0x10) ;
+ omap_writel(0x5555, OMAP_WATCHDOG_SPR); /* TIMER_MODE */
+ while (omap_readl(OMAP_WATCHDOG_WPS) & 0x10) ;
+ return;
+}
+
+/*
+ * Allow only one person to hold it open
+ */
+
+static int
+omap_wdt_open(struct inode *inode, struct file *file)
+{
+ if (test_and_set_bit(1, (unsigned long *) &omap_wdt_users))
+ return -EBUSY;
+
+ if (armwdt_ck == 0 || IS_ERR(armwdt_ck)) {
+ armwdt_ck = clk_get(omap_wdt_miscdev.dev, "armwdt_ck");
+ if (IS_ERR(armwdt_ck)) {
+ omap_wdt_users = 0;
+ return PTR_ERR(armwdt_ck);
+ }
+ clk_use(armwdt_ck); /* Enable the clock */
+ }
+
+ omap_wdt_enable();
+
+ return 0;
+}
+
+static int
+omap_wdt_release(struct inode *inode, struct file *file)
+{
+ /*
+ * Shut off the timer.
+ * Lock it in if it's a module and we defined ...NOWAYOUT
+ */
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ omap_wdt_disable();
+ clk_unuse(armwdt_ck); /* Disable the clock */
+ clk_put(armwdt_ck);
+ armwdt_ck = 0;
+#endif
+ omap_wdt_users = 0;
+ return 0;
+}
+
+static ssize_t
+omap_wdt_write(struct file *file, const char *data, size_t len, loff_t * ppos)
+{
+ /* Can't seek (pwrite) on this device */
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
+
+ /* Refresh LOAD_TIME. */
+ if (len) {
+ omap_wdt_ping();
+ return 1;
+ }
+ return 0;
+}
+
+static int
+omap_wdt_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int new_margin;
+ static struct watchdog_info ident = {
+ .identity = "OMAP Watchdog",
+ .options = WDIOF_SETTIMEOUT,
+ .firmware_version = 0,
+ };
+
+ switch (cmd) {
+ default:
+ return -ENOIOCTLCMD;
+ case WDIOC_GETSUPPORT:
+ return copy_to_user((struct watchdog_info *) arg, &ident,
+ sizeof (ident));
+ case WDIOC_GETSTATUS:
+ return put_user(0, (int *) arg);
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(omap_readw(ARM_SYSST), (int *) arg);
+ case WDIOC_KEEPALIVE:
+ omap_wdt_ping();
+ return 0;
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_margin, (int *) arg))
+ return -EFAULT;
+ if ((new_margin < TIMER_MARGIN_MIN)
+ || (new_margin > TIMER_MARGIN_MAX))
+ timer_margin = TIMER_MARGIN_MAX; /* default timeout */
+ else
+ timer_margin = new_margin;
+ pre_margin = GET_WLDR_VAL(timer_margin);
+
+ omap_wdt_disable();
+
+ while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x04) ; /* wait for posted write to complete */
+ omap_writel(pre_margin, (OMAP_WATCHDOG_LDR));
+ while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x04) ; /* wait for posted write to complete */
+
+ omap_wdt_enable();
+
+ omap_wdt_ping();
+ /* Fall */
+ case WDIOC_GETTIMEOUT:
+ return put_user(timer_margin, (int *) arg);
+ }
+}
+
+static struct file_operations omap_wdt_fops = {
+ .owner = THIS_MODULE,
+ .write = omap_wdt_write,
+ .ioctl = omap_wdt_ioctl,
+ .open = omap_wdt_open,
+ .release = omap_wdt_release,
+};
+
+static struct miscdevice omap_wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "omap_wdt",
+ .fops = &omap_wdt_fops
+};
+
+static int __init
+omap_wdt_init(void)
+{
+ int ret;
+
+ ret = misc_register(&omap_wdt_miscdev);
+
+ if (ret)
+ return ret;
+
+ omap_wdt_disable();
+
+ if (timer_margin < 1 || timer_margin > 32)
+ timer_margin = 32;
+
+ printk(KERN_INFO "%s: TI OMAP Watchdog Timer: timer margin %d sec\n",
+ omap_wdt_miscdev.name, timer_margin);
+
+ return 0;
+}
+
+static void __exit
+omap_wdt_exit(void)
+{
+ misc_deregister(&omap_wdt_miscdev);
+}
+
+module_init(omap_wdt_init);
+module_exit(omap_wdt_exit);
+
+MODULE_AUTHOR("George G. Davis");
+MODULE_LICENSE("GPL");
+module_param(timer_margin, int, 0);
--- /dev/null
+/*
+ * linux/drivers/char/watchdog/omap1610_wdt.h
+ *
+ * BRIEF MODULE DESCRIPTION
+ * OMAP Watchdog timer register definitions
+ *
+ * Copyright (C) 2004 Texas Instruments.
+ *
+ * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * 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.
+ */
+
+#ifndef _OMAP_WATCHDOG_H
+#define _OMAP_WATCHDOG_H
+
+#define OMAP1610_WATCHDOG_BASE 0xfffeb000
+
+#define OMAP_WATCHDOG_BASE OMAP1610_WATCHDOG_BASE
+
+#define OMAP_WATCHDOG_REV (OMAP_WATCHDOG_BASE + 0x00)
+#define OMAP_WATCHDOG_SYS_CONFIG (OMAP_WATCHDOG_BASE + 0x10)
+#define OMAP_WATCHDOG_STATUS (OMAP_WATCHDOG_BASE + 0x14)
+#define OMAP_WATCHDOG_CNTRL (OMAP_WATCHDOG_BASE + 0x24)
+#define OMAP_WATCHDOG_CRR (OMAP_WATCHDOG_BASE + 0x28)
+#define OMAP_WATCHDOG_LDR (OMAP_WATCHDOG_BASE + 0x2c)
+#define OMAP_WATCHDOG_TGR (OMAP_WATCHDOG_BASE + 0x30)
+#define OMAP_WATCHDOG_WPS (OMAP_WATCHDOG_BASE + 0x34)
+#define OMAP_WATCHDOG_SPR (OMAP_WATCHDOG_BASE + 0x48)
+
+#define TIMER_MARGIN_MAX 32 /* Default is 32 seconds */
+#define TIMER_MARGIN_MIN 1
+
+#define GET_WLDR_VAL(x) (0xffffffff - ((x) * 32768)) + 1
+
+#endif /* _OMAP_WATCHDOG_H */
projects / linux-2.6-omap-h63xx.git / commitdiff