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path: root/drivers/char/watchdog/omap_wdt.c
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Diffstat (limited to 'drivers/char/watchdog/omap_wdt.c')
-rw-r--r--drivers/char/watchdog/omap_wdt.c389
1 files changed, 0 insertions, 389 deletions
diff --git a/drivers/char/watchdog/omap_wdt.c b/drivers/char/watchdog/omap_wdt.c
deleted file mode 100644
index 719b066f73c..00000000000
--- a/drivers/char/watchdog/omap_wdt.c
+++ /dev/null
@@ -1,389 +0,0 @@
-/*
- * 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 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)
-{
- /* wait for posted write to complete */
- while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08)
- cpu_relax();
- wdt_trgr_pattern = ~wdt_trgr_pattern;
- omap_writel(wdt_trgr_pattern, (OMAP_WATCHDOG_TGR));
- /* wait for posted write to complete */
- while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08)
- cpu_relax();
- /* 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)
- cpu_relax();
- omap_writel(0x4444, OMAP_WATCHDOG_SPR);
- while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10)
- cpu_relax();
-}
-
-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)
- cpu_relax();
- omap_writel(0x5555, OMAP_WATCHDOG_SPR); /* TIMER_MODE */
- while (omap_readl(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(void)
-{
- u32 pre_margin = GET_WLDR_VAL(timer_margin);
-
- /* just count up at 32 KHz */
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04)
- cpu_relax();
- omap_writel(pre_margin, OMAP_WATCHDOG_LDR);
- while (omap_readl(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)
-{
- if (test_and_set_bit(1, (unsigned long *)&omap_wdt_users))
- return -EBUSY;
-
- if (cpu_is_omap16xx())
- clk_enable(armwdt_ck); /* Enable the clock */
-
- if (cpu_is_omap24xx()) {
- clk_enable(mpu_wdt_ick); /* Enable the interface clock */
- clk_enable(mpu_wdt_fck); /* Enable the functional clock */
- }
-
- /* initialize prescaler */
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01)
- cpu_relax();
- omap_writel((1 << 5) | (PTV << 2), OMAP_WATCHDOG_CNTRL);
- while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01)
- cpu_relax();
-
- omap_wdt_set_timeout();
- omap_wdt_enable();
- return nonseekable_open(inode, file);
-}
-
-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_disable(armwdt_ck); /* Disable the clock */
- clk_put(armwdt_ck);
- armwdt_ck = NULL;
- }
-
- if (cpu_is_omap24xx()) {
- clk_disable(mpu_wdt_ick); /* Disable the clock */
- clk_disable(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 -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();
- 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 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 struct miscdevice omap_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &omap_wdt_fops
-};
-
-static int __init omap_wdt_probe(struct platform_device *pdev)
-{
- 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;
-
- platform_set_drvdata(pdev, mem);
-
- omap_wdt_users = 0;
-
- if (cpu_is_omap16xx()) {
- armwdt_ck = clk_get(&pdev->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(&pdev->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(&pdev->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.parent = &pdev->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 platform_device *pdev)
-{
- omap_wdt_disable();
-}
-
-static int omap_wdt_remove(struct platform_device *pdev)
-{
- struct resource *mem = platform_get_drvdata(pdev);
- 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 platform_device *pdev, pm_message_t state)
-{
- if (omap_wdt_users)
- omap_wdt_disable();
- return 0;
-}
-
-static int omap_wdt_resume(struct platform_device *pdev)
-{
- if (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 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);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-22 05:59:54 +0000