static inline void omap_init_rtc(void) {}
#endif
-/*-------------------------------------------------------------------------*/
-
-#if defined(CONFIG_OMAP16XX_WATCHDOG) || defined(CONFIG_OMAP16XX_WATCHDOG_MODULE)
-
-#define OMAP_WDT_BASE 0xfffeb000
-
-static struct resource wdt_resources[] = {
- {
- .start = OMAP_WDT_BASE,
- .end = OMAP_WDT_BASE + 0x4f,
- .flags = IORESOURCE_MEM,
- },
-};
-
-static struct platform_device omap_wdt_device = {
- .name = "omap1610_wdt",
- .id = -1,
- .dev = {
- .release = omap_nop_release,
- },
- .num_resources = ARRAY_SIZE(wdt_resources),
- .resource = wdt_resources,
-};
-
-static void omap_init_wdt(void)
-{
- (void) platform_device_register(&omap_wdt_device);
-}
-#else
-static inline void omap_init_wdt(void) {}
-#endif
-
/*-------------------------------------------------------------------------*/
*/
omap_init_irda();
omap_init_rtc();
- omap_init_wdt();
return 0;
}
static inline void omap_init_mmc(void) {}
#endif
+#if defined(CONFIG_OMAP_WATCHDOG) || defined(CONFIG_OMAP_WATCHDOG_MODULE)
+
+#ifdef CONFIG_ARCH_OMAP24XX
+#define OMAP_WDT_BASE 0x48022000
+#else
+#define OMAP_WDT_BASE 0xfffeb000
+#endif
+
+static struct resource wdt_resources[] = {
+ {
+ .start = OMAP_WDT_BASE,
+ .end = OMAP_WDT_BASE + 0x4f,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct platform_device omap_wdt_device = {
+ .name = "omap_wdt",
+ .id = -1,
+ .dev = {
+ .release = omap_nop_release,
+ },
+ .num_resources = ARRAY_SIZE(wdt_resources),
+ .resource = wdt_resources,
+};
+
+static void omap_init_wdt(void)
+{
+ (void) platform_device_register(&omap_wdt_device);
+}
+#else
+static inline void omap_init_wdt(void) {}
+#endif
+
+
/*
* This gets called after board-specific INIT_MACHINE, and initializes most
* on-chip peripherals accessible on this board (except for few like USB):
*/
omap_init_i2c();
omap_init_mmc();
+ omap_init_wdt();
return 0;
}
Most people will say N.
-config OMAP16XX_WATCHDOG
- tristate "OMAP1610/OMAP1710 Watchdog"
- depends on WATCHDOG && ARCH_OMAP16XX
+config OMAP_WATCHDOG
+ tristate "OMAP Watchdog"
+ depends on WATCHDOG && (ARCH_OMAP16XX || ARCH_OMAP24XX)
help
- Support for TI OMAP1610/OMAP1710 watchdog. Say 'Y' here to enable the
+ Support for TI OMAP1610/OMAP1710/OMAP2420 watchdog. Say 'Y' here to enable the
OMAP1610/OMAP1710 watchdog timer.
endmenu
obj-$(CONFIG_977_WATCHDOG) += wdt977.o
obj-$(CONFIG_IXP2000_WATCHDOG) += ixp2000_wdt.o
obj-$(CONFIG_IXP4XX_WATCHDOG) += ixp4xx_wdt.o
-obj-$(CONFIG_OMAP16XX_WATCHDOG) += omap1610_wdt.o
+obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o
obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
obj-$(CONFIG_MPCORE_WATCHDOG) += mpcore_wdt.o
-/*
- * linux/drivers/char/omap1610_wdt.c
- *
- * Watchdog driver for the TI OMAP 16xx 32KHz (non-secure) watchdog
- *
- * 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
- *
- * Copyright (c) 2005 David Brownell
- * Use the driver model and standard identifiers; handle bigger timeouts.
- */
-
-#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 <linux/device.h>
-#include <linux/moduleparam.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/hardware.h>
-#include <asm/bitops.h>
-#include <asm/hardware/clock.h>
-
-#include "omap1610_wdt.h"
-
-
-static unsigned timer_margin;
-module_param(timer_margin, uint, 0);
-MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
-
-static int omap_wdt_users;
-static struct clk *armwdt_ck = NULL;
-
-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 */
- /* reloaded WCRR from WLDR */
-}
-
-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) ;
-}
-
-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) ;
-}
-
-static void
-omap_wdt_adjust_timeout(unsigned new_timeout)
-{
- if (new_timeout < TIMER_MARGIN_MIN)
- new_timeout = TIMER_MARGIN_DEFAULT;
- if (new_timeout > TIMER_MARGIN_MAX)
- new_timeout = TIMER_MARGIN_MAX;
- timer_margin = new_timeout;
-}
-
-static void
-omap_wdt_set_timeout(void)
-{
- u32 pre_margin = GET_WLDR_VAL(timer_margin);
-
- /* just count up at 32 KHz */
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04) continue;
- omap_writel(pre_margin, OMAP_WATCHDOG_LDR);
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04) continue;
-}
-
-
-/*
- * Allow only one task 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;
-
- clk_use(armwdt_ck); /* Enable the clock */
-
- /* initialize prescaler */
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01) continue;
- omap_writel((1 << 5) | (PTV << 2), OMAP_WATCHDOG_CNTRL);
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01) continue;
-
- omap_wdt_set_timeout();
- omap_wdt_enable();
- return 0;
-}
-
-static int
-omap_wdt_release(struct inode *inode, struct file *file)
-{
- /*
- * Shut off the timer unless NOWAYOUT is defined.
- */
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- omap_wdt_disable();
- clk_unuse(armwdt_ck); /* Disable the clock */
- clk_put(armwdt_ck);
- armwdt_ck = NULL;
-#else
- printk(KERN_CRIT "omap1610_wdt: Unexpected close, not stopping!\n");
-#endif
- omap_wdt_users = 0;
- return 0;
-}
-
-static ssize_t
-omap_wdt_write(struct file *file, const char __user *data,
- size_t len, loff_t * ppos)
-{
- /* Refresh LOAD_TIME. */
- if (len)
- omap_wdt_ping();
- return len;
-}
-
-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 __user *) arg, &ident,
- sizeof (ident));
- case WDIOC_GETSTATUS:
- return put_user(0, (int __user *) arg);
- case WDIOC_GETBOOTSTATUS:
- return put_user(omap_readw(ARM_SYSST), (int __user *) arg);
- case WDIOC_KEEPALIVE:
- omap_wdt_ping();
- return 0;
- case WDIOC_SETTIMEOUT:
- if (get_user(new_margin, (int __user *) arg))
- return -EFAULT;
- omap_wdt_adjust_timeout(new_margin);
-
- omap_wdt_disable();
- omap_wdt_set_timeout();
- omap_wdt_enable();
-
- omap_wdt_ping();
- /* Fall */
- case WDIOC_GETTIMEOUT:
- return put_user(timer_margin, (int __user *) 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 = "watchdog",
- .fops = &omap_wdt_fops
-};
-
-static int __init
-omap1610_wdt_probe(struct device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct resource *res, *mem;
- int ret;
-
- /* reserve static register mappings */
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENOENT;
- mem = request_mem_region(res->start, res->end - res->start + 1,
- pdev->name);
- if (mem == NULL)
- return -EBUSY;
- dev_set_drvdata(dev, mem);
-
- omap_wdt_users = 0;
- armwdt_ck = clk_get(dev, "armwdt_ck");
- if (IS_ERR(armwdt_ck)) {
- ret = PTR_ERR(armwdt_ck);
- armwdt_ck = NULL;
- goto fail;
- }
-
- omap_wdt_disable();
- omap_wdt_adjust_timeout(timer_margin);
-
- omap_wdt_miscdev.dev = dev;
- ret = misc_register(&omap_wdt_miscdev);
- if (ret)
- goto fail;
-
- pr_info("OMAP Watchdog Timer: initial timeout %d sec\n", timer_margin);
-
- /* autogate OCP interface clock */
- omap_writel(0x01, OMAP_WATCHDOG_SYS_CONFIG);
- return 0;
-
-fail:
- if (armwdt_ck)
- clk_put(armwdt_ck);
- release_resource(mem);
- return ret;
-}
-
-static void
-omap1610_wdt_shutdown(struct device *dev)
-{
- omap_wdt_disable();
-}
-
-static int __exit
-omap1610_wdt_remove(struct device *dev)
-{
- struct resource *mem = dev_get_drvdata(dev);
- misc_deregister(&omap_wdt_miscdev);
- release_resource(mem);
- clk_put(armwdt_ck);
- return 0;
-}
-
-#ifdef CONFIG_PM
-
-/* REVISIT ... not clear this is the best way to handle system suspend; and
- * it's very inappropriate for selective device suspend (e.g. suspending this
- * through sysfs rather than by stopping the watchdog daemon). Also, this
- * may not play well enough with NOWAYOUT...
- */
-
-static int omap1610_wdt_suspend(struct device *dev, pm_message_t mesg, u32 level)
-{
- if (level == SUSPEND_POWER_DOWN && omap_wdt_users)
- omap_wdt_disable();
- return 0;
-}
-
-static int omap1610_wdt_resume(struct device *dev, u32 level)
-{
- if (level == RESUME_POWER_ON && omap_wdt_users) {
- omap_wdt_enable();
- omap_wdt_ping();
- }
- return 0;
-}
-
-#else
-#define omap1610_wdt_suspend NULL
-#define omap1610_wdt_resume NULL
-#endif
-
-static struct device_driver omap1610_wdt_driver = {
- .name = "omap1610_wdt",
- .bus = &platform_bus_type,
- .probe = omap1610_wdt_probe,
- .shutdown = omap1610_wdt_shutdown,
- .remove = __exit_p(omap1610_wdt_remove),
- .suspend = omap1610_wdt_suspend,
- .resume = omap1610_wdt_resume,
-};
-
-static int __init omap_wdt_init(void)
-{
- return driver_register(&omap1610_wdt_driver);
-}
-
-static void __exit omap_wdt_exit(void)
-{
- driver_unregister(&omap1610_wdt_driver);
-}
-
-module_init(omap_wdt_init);
-module_exit(omap_wdt_exit);
-
-MODULE_AUTHOR("George G. Davis");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
-/*
- * 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)
-
-/* Using the prescaler, the OMAP watchdog could go for many
- * months before firing. These limits work without scaling,
- * with the 60 second default assumed by most tools and docs.
- */
-#define TIMER_MARGIN_MAX (24 * 60 * 60) /* 1 day */
-#define TIMER_MARGIN_DEFAULT 60 /* 60 secs */
-#define TIMER_MARGIN_MIN 1
-
-#define PTV 0 /* prescale */
-#define GET_WLDR_VAL(secs) (0xffffffff - ((secs) * (32768/(1<<PTV))) + 1)
-
-#endif /* _OMAP_WATCHDOG_H */
--- /dev/null
+/*
+ * linux/drivers/char/omap_wdt.c
+ *
+ * Watchdog driver for the TI OMAP 16xx & 24xx 32KHz (non-secure) watchdog
+ *
+ * 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
+ *
+ * Copyright (c) 2005 David Brownell
+ * Use the driver model and standard identifiers; handle bigger timeouts.
+ */
+
+#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 <linux/device.h>
+#include <linux/moduleparam.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/hardware.h>
+#include <asm/bitops.h>
+#include <asm/hardware/clock.h>
+
+#ifdef CONFIG_ARCH_OMAP24XX
+#include <asm/arch/prcm.h>
+#endif
+
+#include "omap_wdt.h"
+
+static unsigned timer_margin;
+module_param(timer_margin, uint, 0);
+MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
+
+static int omap_wdt_users;
+static struct clk *armwdt_ck = NULL;
+static struct clk *mpu_wdt_ick = NULL;
+static struct clk *mpu_wdt_fck = NULL;
+
+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 */
+ /* reloaded WCRR from WLDR */
+}
+
+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) ;
+}
+
+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) ;
+}
+
+static void omap_wdt_adjust_timeout(unsigned new_timeout)
+{
+ if (new_timeout < TIMER_MARGIN_MIN)
+ new_timeout = TIMER_MARGIN_DEFAULT;
+ if (new_timeout > TIMER_MARGIN_MAX)
+ new_timeout = TIMER_MARGIN_MAX;
+ timer_margin = new_timeout;
+}
+
+static void omap_wdt_set_timeout(void)
+{
+ u32 pre_margin = GET_WLDR_VAL(timer_margin);
+
+ /* just count up at 32 KHz */
+ while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04)
+ continue;
+ omap_writel(pre_margin, OMAP_WATCHDOG_LDR);
+ while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04)
+ continue;
+}
+
+/*
+ * Allow only one task 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 (cpu_is_omap16xx()) {
+ clk_use(armwdt_ck); /* Enable the clock */
+ }
+
+ if (cpu_is_omap24xx()) {
+ clk_use(mpu_wdt_ick); /* Enable the interface clock */
+ clk_use(mpu_wdt_fck); /* Enable the functional clock */
+ }
+
+ /* initialize prescaler */
+ while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01)
+ continue;
+ omap_writel((1 << 5) | (PTV << 2), OMAP_WATCHDOG_CNTRL);
+ while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01)
+ continue;
+
+ omap_wdt_set_timeout();
+ omap_wdt_enable();
+ return 0;
+}
+
+static int omap_wdt_release(struct inode *inode, struct file *file)
+{
+ /*
+ * Shut off the timer unless NOWAYOUT is defined.
+ */
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ omap_wdt_disable();
+
+ if (cpu_is_omap16xx()) {
+ clk_unuse(armwdt_ck); /* Disable the clock */
+ clk_put(armwdt_ck);
+ armwdt_ck = NULL;
+ }
+
+ if (cpu_is_omap24xx()) {
+ clk_unuse(mpu_wdt_ick); /* Disable the clock */
+ clk_unuse(mpu_wdt_fck); /* Disable the clock */
+ clk_put(mpu_wdt_ick);
+ clk_put(mpu_wdt_fck);
+ mpu_wdt_ick = NULL;
+ mpu_wdt_fck = NULL;
+ }
+#else
+ printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
+#endif
+ omap_wdt_users = 0;
+ return 0;
+}
+
+static ssize_t
+omap_wdt_write(struct file *file, const char __user * data,
+ size_t len, loff_t * ppos)
+{
+ /* Refresh LOAD_TIME. */
+ if (len)
+ omap_wdt_ping();
+ return len;
+}
+
+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 __user *)arg, &ident,
+ sizeof(ident));
+ case WDIOC_GETSTATUS:
+ return put_user(0, (int __user *)arg);
+ case WDIOC_GETBOOTSTATUS:
+ if (cpu_is_omap16xx())
+ return put_user(omap_readw(ARM_SYSST),
+ (int __user *)arg);
+ if (cpu_is_omap24xx())
+ return put_user(RM_RSTST_WKUP, (int __user *)arg);
+ case WDIOC_KEEPALIVE:
+ omap_wdt_ping();
+ return 0;
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_margin, (int __user *)arg))
+ return -EFAULT;
+ omap_wdt_adjust_timeout(new_margin);
+
+ omap_wdt_disable();
+ omap_wdt_set_timeout();
+ omap_wdt_enable();
+
+ omap_wdt_ping();
+ /* Fall */
+ case WDIOC_GETTIMEOUT:
+ return put_user(timer_margin, (int __user *)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 = "watchdog",
+ .fops = &omap_wdt_fops
+};
+
+static int __init omap_wdt_probe(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct resource *res, *mem;
+ int ret;
+
+ /* reserve static register mappings */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOENT;
+
+ mem = request_mem_region(res->start, res->end - res->start + 1,
+ pdev->name);
+ if (mem == NULL)
+ return -EBUSY;
+
+ dev_set_drvdata(dev, mem);
+
+ omap_wdt_users = 0;
+
+ if (cpu_is_omap16xx()) {
+ armwdt_ck = clk_get(dev, "armwdt_ck");
+ if (IS_ERR(armwdt_ck)) {
+ ret = PTR_ERR(armwdt_ck);
+ armwdt_ck = NULL;
+ goto fail;
+ }
+ }
+
+ if (cpu_is_omap24xx()) {
+ mpu_wdt_ick = clk_get(dev, "mpu_wdt_ick");
+ if (IS_ERR(mpu_wdt_ick)) {
+ ret = PTR_ERR(mpu_wdt_ick);
+ mpu_wdt_ick = NULL;
+ goto fail;
+ }
+ mpu_wdt_fck = clk_get(dev, "mpu_wdt_fck");
+ if (IS_ERR(mpu_wdt_fck)) {
+ ret = PTR_ERR(mpu_wdt_fck);
+ mpu_wdt_fck = NULL;
+ goto fail;
+ }
+ }
+
+ omap_wdt_disable();
+ omap_wdt_adjust_timeout(timer_margin);
+
+ omap_wdt_miscdev.dev = dev;
+ ret = misc_register(&omap_wdt_miscdev);
+ if (ret)
+ goto fail;
+
+ pr_info("OMAP Watchdog Timer: initial timeout %d sec\n", timer_margin);
+
+ /* autogate OCP interface clock */
+ omap_writel(0x01, OMAP_WATCHDOG_SYS_CONFIG);
+ return 0;
+
+fail:
+ if (armwdt_ck)
+ clk_put(armwdt_ck);
+ if (mpu_wdt_ick)
+ clk_put(mpu_wdt_ick);
+ if (mpu_wdt_fck)
+ clk_put(mpu_wdt_fck);
+ release_resource(mem);
+ return ret;
+}
+
+static void omap_wdt_shutdown(struct device *dev)
+{
+ omap_wdt_disable();
+}
+
+static int __exit omap_wdt_remove(struct device *dev)
+{
+ struct resource *mem = dev_get_drvdata(dev);
+ misc_deregister(&omap_wdt_miscdev);
+ release_resource(mem);
+ if (armwdt_ck)
+ clk_put(armwdt_ck);
+ if (mpu_wdt_ick)
+ clk_put(mpu_wdt_ick);
+ if (mpu_wdt_fck)
+ clk_put(mpu_wdt_fck);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+
+/* REVISIT ... not clear this is the best way to handle system suspend; and
+ * it's very inappropriate for selective device suspend (e.g. suspending this
+ * through sysfs rather than by stopping the watchdog daemon). Also, this
+ * may not play well enough with NOWAYOUT...
+ */
+
+static int omap_wdt_suspend(struct device *dev, pm_message_t mesg, u32 level)
+{
+ if (level == SUSPEND_POWER_DOWN && omap_wdt_users)
+ omap_wdt_disable();
+ return 0;
+}
+
+static int omap_wdt_resume(struct device *dev, u32 level)
+{
+ if (level == RESUME_POWER_ON && omap_wdt_users) {
+ omap_wdt_enable();
+ omap_wdt_ping();
+ }
+ return 0;
+}
+
+#else
+#define omap_wdt_suspend NULL
+#define omap_wdt_resume NULL
+#endif
+
+static struct device_driver omap_wdt_driver = {
+ .name = "omap_wdt",
+ .bus = &platform_bus_type,
+ .probe = omap_wdt_probe,
+ .shutdown = omap_wdt_shutdown,
+ .remove = __exit_p(omap_wdt_remove),
+ .suspend = omap_wdt_suspend,
+ .resume = omap_wdt_resume,
+};
+
+static int __init omap_wdt_init(void)
+{
+ return driver_register(&omap_wdt_driver);
+}
+
+static void __exit omap_wdt_exit(void)
+{
+ driver_unregister(&omap_wdt_driver);
+}
+
+module_init(omap_wdt_init);
+module_exit(omap_wdt_exit);
+
+MODULE_AUTHOR("George G. Davis");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
--- /dev/null
+/*
+ * linux/drivers/char/watchdog/omap_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 OMAP2420_WATCHDOG_BASE 0x48022000 /*WDT Timer 2 */
+
+#ifdef CONFIG_ARCH_OMAP24XX
+#define OMAP_WATCHDOG_BASE OMAP2420_WATCHDOG_BASE
+#else
+#define OMAP_WATCHDOG_BASE OMAP1610_WATCHDOG_BASE
+#endif
+
+#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)
+
+/* Using the prescaler, the OMAP watchdog could go for many
+ * months before firing. These limits work without scaling,
+ * with the 60 second default assumed by most tools and docs.
+ */
+#define TIMER_MARGIN_MAX (24 * 60 * 60) /* 1 day */
+#define TIMER_MARGIN_DEFAULT 60 /* 60 secs */
+#define TIMER_MARGIN_MIN 1
+
+#define PTV 0 /* prescale */
+#define GET_WLDR_VAL(secs) (0xffffffff - ((secs) * (32768/(1<<PTV))) + 1)
+
+#endif /* _OMAP_WATCHDOG_H */
projects / linux-2.6-omap-h63xx.git / commitdiff