mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-21 00:42:16 +00:00
f37d193c7c
Since 43cc71eed1
, the platform modalias is
prefixed with "platform:". Add MODULE_ALIAS() to the hotpluggable watchdog
drivers, to re-enable auto loading.
[dbrownell@users.sourceforge.net: more drivers; registration fixes]
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Wim Van Sebroeck <wim@iguana.be>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
391 lines
9.0 KiB
C
391 lines
9.0 KiB
C
/*
|
|
* 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 <linux/bitops.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/hardware.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);
|
|
MODULE_ALIAS("platform:omap_wdt");
|