+++ /dev/null
-/*
- * linux/drivers/char/watchdog/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/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/init.h>
-#include <linux/err.h>
-#include <linux/platform_device.h>
-#include <linux/moduleparam.h>
-#include <linux/clk.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/hardware.h>
-#include <asm/bitops.h>
-
-#include <asm/arch/prcm.h>
-
-#include "omap_wdt.h"
-
-static struct platform_device *omap_wdt_dev;
-
-static unsigned timer_margin;
-module_param(timer_margin, uint, 0);
-MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
-
-static unsigned int wdt_trgr_pattern = 0x1234;
-struct omap_wdt_dev {
- void __iomem *base; /* physical */
- struct device *dev;
- int omap_wdt_users;
- struct clk *armwdt_ck;
- struct clk *mpu_wdt_ick;
- struct clk *mpu_wdt_fck;
- struct resource *mem;
- struct miscdevice omap_wdt_miscdev;
-};
-
-static void omap_wdt_ping(struct omap_wdt_dev *wdev)
-{
- void __iomem *base = wdev->base;
- /* wait for posted write to complete */
- while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
- cpu_relax();
- wdt_trgr_pattern = ~wdt_trgr_pattern;
- omap_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
- /* wait for posted write to complete */
- while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
- cpu_relax();
- /* reloaded WCRR from WLDR */
-}
-
-static void omap_wdt_enable(struct omap_wdt_dev *wdev)
-{
- void __iomem *base;
- base = wdev->base;
- /* Sequence to enable the watchdog */
- omap_writel(0xBBBB, base + OMAP_WATCHDOG_SPR);
- while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
- cpu_relax();
- omap_writel(0x4444, base + OMAP_WATCHDOG_SPR);
- while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
- cpu_relax();
-}
-
-static void omap_wdt_disable(struct omap_wdt_dev *wdev)
-{
- void __iomem *base;
- base = wdev->base;
- /* sequence required to disable watchdog */
- omap_writel(0xAAAA, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
- while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
- cpu_relax();
- omap_writel(0x5555, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
- while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
- cpu_relax();
-}
-
-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(struct omap_wdt_dev *wdev)
-{
- u32 pre_margin = GET_WLDR_VAL(timer_margin);
- void __iomem *base;
- base = wdev->base;
-
- /* just count up at 32 KHz */
- while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
- cpu_relax();
- omap_writel(pre_margin, base + OMAP_WATCHDOG_LDR);
- while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
- cpu_relax();
-}
-
-/*
- * Allow only one task to hold it open
- */
-
-static int omap_wdt_open(struct inode *inode, struct file *file)
-{
- struct omap_wdt_dev *wdev;
- void __iomem *base;
- wdev = platform_get_drvdata(omap_wdt_dev);
- base = wdev->base;
- if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users)))
- return -EBUSY;
-
- if (cpu_is_omap16xx())
- clk_enable(wdev->armwdt_ck); /* Enable the clock */
-
- if (cpu_is_omap24xx()) {
- clk_enable(wdev->mpu_wdt_ick); /* Enable the interface clock */
- clk_enable(wdev->mpu_wdt_fck); /* Enable the functional clock */
- }
-
- /* initialize prescaler */
- while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
- cpu_relax();
- omap_writel((1 << 5) | (PTV << 2), base + OMAP_WATCHDOG_CNTRL);
- while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
- cpu_relax();
-
- file->private_data = (void *) wdev;
-
- omap_wdt_set_timeout(wdev);
- omap_wdt_enable(wdev);
- return nonseekable_open(inode, file);
-}
-
-static int omap_wdt_release(struct inode *inode, struct file *file)
-{
- struct omap_wdt_dev *wdev;
- wdev = file->private_data;
- /*
- * Shut off the timer unless NOWAYOUT is defined.
- */
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
-
- omap_wdt_disable(wdev);
-
- if (cpu_is_omap16xx()) {
- clk_disable(wdev->armwdt_ck); /* Disable the clock */
- clk_put(wdev->armwdt_ck);
- wdev->armwdt_ck = NULL;
- }
-
- if (cpu_is_omap24xx()) {
- clk_disable(wdev->mpu_wdt_ick); /* Disable the clock */
- clk_disable(wdev->mpu_wdt_fck); /* Disable the clock */
- clk_put(wdev->mpu_wdt_ick);
- clk_put(wdev->mpu_wdt_fck);
- wdev->mpu_wdt_ick = NULL;
- wdev->mpu_wdt_fck = NULL;
- }
-#else
- printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
-#endif
- wdev->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)
-{
- struct omap_wdt_dev *wdev;
- wdev = file->private_data;
- /* Refresh LOAD_TIME. */
- if (len)
- omap_wdt_ping(wdev);
- return len;
-}
-
-static int
-omap_wdt_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- struct omap_wdt_dev *wdev;
- int new_margin;
- static struct watchdog_info ident = {
- .identity = "OMAP Watchdog",
- .options = WDIOF_SETTIMEOUT,
- .firmware_version = 0,
- };
- wdev = file->private_data;
-
- switch (cmd) {
- default:
- return -ENOTTY;
- 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(omap_prcm_get_reset_sources(),
- (int __user *)arg);
- case WDIOC_KEEPALIVE:
- omap_wdt_ping(wdev);
- return 0;
- case WDIOC_SETTIMEOUT:
- if (get_user(new_margin, (int __user *)arg))
- return -EFAULT;
- omap_wdt_adjust_timeout(new_margin);
-
- omap_wdt_disable(wdev);
- omap_wdt_set_timeout(wdev);
- omap_wdt_enable(wdev);
-
- omap_wdt_ping(wdev);
- /* Fall */
- case WDIOC_GETTIMEOUT:
- return put_user(timer_margin, (int __user *)arg);
- }
- return 0;
-}
-
-static const 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 int __init omap_wdt_probe(struct platform_device *pdev)
-{
- struct resource *res, *mem;
- int ret;
- struct omap_wdt_dev *wdev;
-
- /* reserve static register mappings */
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENOENT;
-
- if (omap_wdt_dev)
- return -EBUSY;
-
- mem = request_mem_region(res->start, res->end - res->start + 1,
- pdev->name);
- if (mem == NULL)
- return -EBUSY;
-
- wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL);
- if (!wdev) {
- ret = -ENOMEM;
- goto fail;
- }
- wdev->omap_wdt_users = 0;
- wdev->mem = mem;
-
- if (cpu_is_omap16xx()) {
- wdev->armwdt_ck = clk_get(&pdev->dev, "armwdt_ck");
- if (IS_ERR(wdev->armwdt_ck)) {
- ret = PTR_ERR(wdev->armwdt_ck);
- wdev->armwdt_ck = NULL;
- goto fail;
- }
- }
-
- if (cpu_is_omap24xx()) {
- wdev->mpu_wdt_ick = clk_get(&pdev->dev, "mpu_wdt_ick");
- if (IS_ERR(wdev->mpu_wdt_ick)) {
- ret = PTR_ERR(wdev->mpu_wdt_ick);
- wdev->mpu_wdt_ick = NULL;
- goto fail;
- }
- wdev->mpu_wdt_fck = clk_get(&pdev->dev, "mpu_wdt_fck");
- if (IS_ERR(wdev->mpu_wdt_fck)) {
- ret = PTR_ERR(wdev->mpu_wdt_fck);
- wdev->mpu_wdt_fck = NULL;
- goto fail;
- }
- }
- wdev->base = (void __iomem *) (mem->start);
- platform_set_drvdata(pdev, wdev);
-
- omap_wdt_disable(wdev);
- omap_wdt_adjust_timeout(timer_margin);
-
- wdev->omap_wdt_miscdev.parent = &pdev->dev;
- wdev->omap_wdt_miscdev.minor = WATCHDOG_MINOR;
- wdev->omap_wdt_miscdev.name = "watchdog";
- wdev->omap_wdt_miscdev.fops = &omap_wdt_fops;
-
- ret = misc_register(&(wdev->omap_wdt_miscdev));
- if (ret)
- goto fail;
-
- pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
- omap_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
- timer_margin);
-
- /* autogate OCP interface clock */
- omap_writel(0x01, wdev->base + OMAP_WATCHDOG_SYS_CONFIG);
-
- omap_wdt_dev = pdev;
-
- return 0;
-
-fail:
- if (wdev) {
- platform_set_drvdata(pdev, NULL);
- if (wdev->armwdt_ck)
- clk_put(wdev->armwdt_ck);
- if (wdev->mpu_wdt_ick)
- clk_put(wdev->mpu_wdt_ick);
- if (wdev->mpu_wdt_fck)
- clk_put(wdev->mpu_wdt_fck);
- kfree(wdev);
- }
- if (mem) {
- release_resource(mem);
- }
- return ret;
-}
-
-static void omap_wdt_shutdown(struct platform_device *pdev)
-{
- struct omap_wdt_dev *wdev;
- wdev = platform_get_drvdata(pdev);
- omap_wdt_disable(wdev);
-}
-
-static int omap_wdt_remove(struct platform_device *pdev)
-{
- struct omap_wdt_dev *wdev;
- wdev = platform_get_drvdata(pdev);
-
- misc_deregister(&(wdev->omap_wdt_miscdev));
- release_resource(wdev->mem);
- platform_set_drvdata(pdev, NULL);
- if (wdev->armwdt_ck)
- clk_put(wdev->armwdt_ck);
- if (wdev->mpu_wdt_ick)
- clk_put(wdev->mpu_wdt_ick);
- if (wdev->mpu_wdt_fck)
- clk_put(wdev->mpu_wdt_fck);
- kfree(wdev);
- omap_wdt_dev = NULL;
- 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 platform_device *pdev, pm_message_t state)
-{
- struct omap_wdt_dev *wdev;
- wdev = platform_get_drvdata(pdev);
- if (wdev->omap_wdt_users)
- omap_wdt_disable(wdev);
- return 0;
-}
-
-static int omap_wdt_resume(struct platform_device *pdev)
-{
- struct omap_wdt_dev *wdev;
- wdev = platform_get_drvdata(pdev);
- if (wdev->omap_wdt_users) {
- omap_wdt_enable(wdev);
- omap_wdt_ping(wdev);
- }
- return 0;
-}
-
-#else
-#define omap_wdt_suspend NULL
-#define omap_wdt_resume NULL
-#endif
-
-static struct platform_driver omap_wdt_driver = {
- .probe = omap_wdt_probe,
- .remove = omap_wdt_remove,
- .shutdown = omap_wdt_shutdown,
- .suspend = omap_wdt_suspend,
- .resume = omap_wdt_resume,
- .driver = {
- .owner = THIS_MODULE,
- .name = "omap_wdt",
- },
-};
-
-static int __init omap_wdt_init(void)
-{
- return platform_driver_register(&omap_wdt_driver);
-}
-
-static void __exit omap_wdt_exit(void)
-{
- platform_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 OMAP_WATCHDOG_REV (0x00)
-#define OMAP_WATCHDOG_SYS_CONFIG (0x10)
-#define OMAP_WATCHDOG_STATUS (0x14)
-#define OMAP_WATCHDOG_CNTRL (0x24)
-#define OMAP_WATCHDOG_CRR (0x28)
-#define OMAP_WATCHDOG_LDR (0x2c)
-#define OMAP_WATCHDOG_TGR (0x30)
-#define OMAP_WATCHDOG_WPS (0x34)
-#define OMAP_WATCHDOG_SPR (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