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watchdog: remove bfin_wdt driver

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The blackfin architecture is getting removed, so this driver has
become obsolete.

Acked-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Aaron Wu <aaron.wu@analog.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2018-03-09 21:01:17 +01:00
parent c7b2d3e52d
commit 011bf62430
4 changed files with 0 additions and 497 deletions
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5
Documentation/watchdog/watchdog-parameters.txt
View File

@ -55,11 +55,6 @@ wdt_time: Watchdog time in seconds. (default=30)
nowayout: Watchdog cannot be stopped once started
(default=kernel config parameter)
-------------------------------------------------
bfin_wdt:
timeout: Watchdog timeout in seconds. (1<=timeout<=((2^32)/SCLK), default=20)
nowayout: Watchdog cannot be stopped once started
(default=kernel config parameter)
-------------------------------------------------
coh901327_wdt:
margin: Watchdog margin in seconds (default 60s)
-------------------------------------------------

13
drivers/watchdog/Kconfig
View File

@ -815,19 +815,6 @@ config SPRD_WATCHDOG
Say Y here to include watchdog timer supported
by Spreadtrum system.
# BLACKFIN Architecture
config BFIN_WDT
tristate "Blackfin On-Chip Watchdog Timer"
depends on BLACKFIN
---help---
If you say yes here you will get support for the Blackfin On-Chip
Watchdog Timer. If you have one of these processors and wish to
have watchdog support enabled, say Y, otherwise say N.
To compile this driver as a module, choose M here: the
module will be called bfin_wdt.
# X86 (i386 + ia64 + x86_64) Architecture
config ACQUIRE_WDT

3
drivers/watchdog/Makefile
View File

@ -91,9 +91,6 @@ obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o
obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o
obj-$(CONFIG_SPRD_WATCHDOG) += sprd_wdt.o
# BLACKFIN Architecture
obj-$(CONFIG_BFIN_WDT) += bfin_wdt.o
# X86 (i386 + ia64 + x86_64) Architecture
obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o

476
drivers/watchdog/bfin_wdt.c
View File

@ -1,476 +0,0 @@
/*
* Blackfin On-Chip Watchdog Driver
*
* Originally based on softdog.c
* Copyright 2006-2010 Analog Devices Inc.
* Copyright 2006-2007 Michele d'Amico
* Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>
*
* Enter bugs at http://blackfin.uclinux.org/
*
* Licensed under the GPL-2 or later.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/uaccess.h>
#include <asm/blackfin.h>
#include <asm/bfin_watchdog.h>
#define stamp(fmt, args...) \
pr_debug("%s:%i: " fmt "\n", __func__, __LINE__, ## args)
#define stampit() stamp("here i am")
#define WATCHDOG_NAME "bfin-wdt"
/* The BF561 has two watchdogs (one per core), but since Linux
* only runs on core A, we'll just work with that one.
*/
#ifdef BF561_FAMILY
# define bfin_read_WDOG_CTL() bfin_read_WDOGA_CTL()
# define bfin_read_WDOG_CNT() bfin_read_WDOGA_CNT()
# define bfin_read_WDOG_STAT() bfin_read_WDOGA_STAT()
# define bfin_write_WDOG_CTL(x) bfin_write_WDOGA_CTL(x)
# define bfin_write_WDOG_CNT(x) bfin_write_WDOGA_CNT(x)
# define bfin_write_WDOG_STAT(x) bfin_write_WDOGA_STAT(x)
#endif
/* some defaults */
#define WATCHDOG_TIMEOUT 20
static unsigned int timeout = WATCHDOG_TIMEOUT;
static bool nowayout = WATCHDOG_NOWAYOUT;
static const struct watchdog_info bfin_wdt_info;
static unsigned long open_check;
static char expect_close;
static DEFINE_SPINLOCK(bfin_wdt_spinlock);
/**
* bfin_wdt_keepalive - Keep the Userspace Watchdog Alive
*
* The Userspace watchdog got a KeepAlive: schedule the next timeout.
*/
static int bfin_wdt_keepalive(void)
{
stampit();
bfin_write_WDOG_STAT(0);
return 0;
}
/**
* bfin_wdt_stop - Stop the Watchdog
*
* Stops the on-chip watchdog.
*/
static int bfin_wdt_stop(void)
{
stampit();
bfin_write_WDOG_CTL(WDEN_DISABLE);
return 0;
}
/**
* bfin_wdt_start - Start the Watchdog
*
* Starts the on-chip watchdog. Automatically loads WDOG_CNT
* into WDOG_STAT for us.
*/
static int bfin_wdt_start(void)
{
stampit();
bfin_write_WDOG_CTL(WDEN_ENABLE | ICTL_RESET);
return 0;
}
/**
* bfin_wdt_running - Check Watchdog status
*
* See if the watchdog is running.
*/
static int bfin_wdt_running(void)
{
stampit();
return ((bfin_read_WDOG_CTL() & WDEN_MASK) != WDEN_DISABLE);
}
/**
* bfin_wdt_set_timeout - Set the Userspace Watchdog timeout
* @t: new timeout value (in seconds)
*
* Translate the specified timeout in seconds into System Clock
* terms which is what the on-chip Watchdog requires.
*/
static int bfin_wdt_set_timeout(unsigned long t)
{
u32 cnt, max_t, sclk;
unsigned long flags;
sclk = get_sclk();
max_t = -1 / sclk;
cnt = t * sclk;
stamp("maxtimeout=%us newtimeout=%lus (cnt=%#x)", max_t, t, cnt);
if (t > max_t) {
pr_warn("timeout value is too large\n");
return -EINVAL;
}
spin_lock_irqsave(&bfin_wdt_spinlock, flags);
{
int run = bfin_wdt_running();
bfin_wdt_stop();
bfin_write_WDOG_CNT(cnt);
if (run)
bfin_wdt_start();
}
spin_unlock_irqrestore(&bfin_wdt_spinlock, flags);
timeout = t;
return 0;
}
/**
* bfin_wdt_open - Open the Device
* @inode: inode of device
* @file: file handle of device
*
* Watchdog device is opened and started.
*/
static int bfin_wdt_open(struct inode *inode, struct file *file)
{
stampit();
if (test_and_set_bit(0, &open_check))
return -EBUSY;
if (nowayout)
__module_get(THIS_MODULE);
bfin_wdt_keepalive();
bfin_wdt_start();
return nonseekable_open(inode, file);
}
/**
* bfin_wdt_close - Close the Device
* @inode: inode of device
* @file: file handle of device
*
* Watchdog device is closed and stopped.
*/
static int bfin_wdt_release(struct inode *inode, struct file *file)
{
stampit();
if (expect_close == 42)
bfin_wdt_stop();
else {
pr_crit("Unexpected close, not stopping watchdog!\n");
bfin_wdt_keepalive();
}
expect_close = 0;
clear_bit(0, &open_check);
return 0;
}
/**
* bfin_wdt_write - Write to Device
* @file: file handle of device
* @buf: buffer to write
* @count: length of buffer
* @ppos: offset
*
* Pings the watchdog on write.
*/
static ssize_t bfin_wdt_write(struct file *file, const char __user *data,
size_t len, loff_t *ppos)
{
stampit();
if (len) {
if (!nowayout) {
size_t i;
/* In case it was set long ago */
expect_close = 0;
for (i = 0; i != len; i++) {
char c;
if (get_user(c, data + i))
return -EFAULT;
if (c == 'V')
expect_close = 42;
}
}
bfin_wdt_keepalive();
}
return len;
}
/**
* bfin_wdt_ioctl - Query Device
* @file: file handle of device
* @cmd: watchdog command
* @arg: argument
*
* Query basic information from the device or ping it, as outlined by the
* watchdog API.
*/
static long bfin_wdt_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
stampit();
switch (cmd) {
case WDIOC_GETSUPPORT:
if (copy_to_user(argp, &bfin_wdt_info, sizeof(bfin_wdt_info)))
return -EFAULT;
else
return 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(!!(_bfin_swrst & SWRST_RESET_WDOG), p);
case WDIOC_SETOPTIONS: {
unsigned long flags;
int options, ret = -EINVAL;
if (get_user(options, p))
return -EFAULT;
spin_lock_irqsave(&bfin_wdt_spinlock, flags);
if (options & WDIOS_DISABLECARD) {
bfin_wdt_stop();
ret = 0;
}
if (options & WDIOS_ENABLECARD) {
bfin_wdt_start();
ret = 0;
}
spin_unlock_irqrestore(&bfin_wdt_spinlock, flags);
return ret;
}
case WDIOC_KEEPALIVE:
bfin_wdt_keepalive();
return 0;
case WDIOC_SETTIMEOUT: {
int new_timeout;
if (get_user(new_timeout, p))
return -EFAULT;
if (bfin_wdt_set_timeout(new_timeout))
return -EINVAL;
}
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timeout, p);
default:
return -ENOTTY;
}
}
#ifdef CONFIG_PM
static int state_before_suspend;
/**
* bfin_wdt_suspend - suspend the watchdog
* @pdev: device being suspended
* @state: requested suspend state
*
* Remember if the watchdog was running and stop it.
* TODO: is this even right? Doesn't seem to be any
* standard in the watchdog world ...
*/
static int bfin_wdt_suspend(struct platform_device *pdev, pm_message_t state)
{
stampit();
state_before_suspend = bfin_wdt_running();
bfin_wdt_stop();
return 0;
}
/**
* bfin_wdt_resume - resume the watchdog
* @pdev: device being resumed
*
* If the watchdog was running, turn it back on.
*/
static int bfin_wdt_resume(struct platform_device *pdev)
{
stampit();
if (state_before_suspend) {
bfin_wdt_set_timeout(timeout);
bfin_wdt_start();
}
return 0;
}
#else
# define bfin_wdt_suspend NULL
# define bfin_wdt_resume NULL
#endif
static const struct file_operations bfin_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = bfin_wdt_write,
.unlocked_ioctl = bfin_wdt_ioctl,
.open = bfin_wdt_open,
.release = bfin_wdt_release,
};
static struct miscdevice bfin_wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &bfin_wdt_fops,
};
static const struct watchdog_info bfin_wdt_info = {
.identity = "Blackfin Watchdog",
.options = WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
};
/**
* bfin_wdt_probe - Initialize module
*
* Registers the misc device. Actual device
* initialization is handled by bfin_wdt_open().
*/
static int bfin_wdt_probe(struct platform_device *pdev)
{
int ret;
ret = misc_register(&bfin_wdt_miscdev);
if (ret) {
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
return ret;
}
pr_info("initialized: timeout=%d sec (nowayout=%d)\n",
timeout, nowayout);
return 0;
}
/**
* bfin_wdt_remove - Initialize module
*
* Unregisters the misc device. Actual device
* deinitialization is handled by bfin_wdt_close().
*/
static int bfin_wdt_remove(struct platform_device *pdev)
{
misc_deregister(&bfin_wdt_miscdev);
return 0;
}
/**
* bfin_wdt_shutdown - Soft Shutdown Handler
*
* Handles the soft shutdown event.
*/
static void bfin_wdt_shutdown(struct platform_device *pdev)
{
stampit();
bfin_wdt_stop();
}
static struct platform_device *bfin_wdt_device;
static struct platform_driver bfin_wdt_driver = {
.probe = bfin_wdt_probe,
.remove = bfin_wdt_remove,
.shutdown = bfin_wdt_shutdown,
.suspend = bfin_wdt_suspend,
.resume = bfin_wdt_resume,
.driver = {
.name = WATCHDOG_NAME,
},
};
/**
* bfin_wdt_init - Initialize module
*
* Checks the module params and registers the platform device & driver.
* Real work is in the platform probe function.
*/
static int __init bfin_wdt_init(void)
{
int ret;
stampit();
/* Check that the timeout value is within range */
if (bfin_wdt_set_timeout(timeout))
return -EINVAL;
/* Since this is an on-chip device and needs no board-specific
* resources, we'll handle all the platform device stuff here.
*/
ret = platform_driver_register(&bfin_wdt_driver);
if (ret) {
pr_err("unable to register driver\n");
return ret;
}
bfin_wdt_device = platform_device_register_simple(WATCHDOG_NAME,
-1, NULL, 0);
if (IS_ERR(bfin_wdt_device)) {
pr_err("unable to register device\n");
platform_driver_unregister(&bfin_wdt_driver);
return PTR_ERR(bfin_wdt_device);
}
return 0;
}
/**
* bfin_wdt_exit - Deinitialize module
*
* Back out the platform device & driver steps. Real work is in the
* platform remove function.
*/
static void __exit bfin_wdt_exit(void)
{
platform_device_unregister(bfin_wdt_device);
platform_driver_unregister(&bfin_wdt_driver);
}
module_init(bfin_wdt_init);
module_exit(bfin_wdt_exit);
MODULE_AUTHOR("Michele d'Amico, Mike Frysinger <vapier@gentoo.org>");
MODULE_DESCRIPTION("Blackfin Watchdog Device Driver");
MODULE_LICENSE("GPL");
module_param(timeout, uint, 0);
MODULE_PARM_DESC(timeout,
"Watchdog timeout in seconds. (1<=timeout<=((2^32)/SCLK), default="
__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");