forked from luck/tmp_suning_uos_patched
watchdog: xilinx: Convert driver to the watchdog framework
- Remove uneeded headers, fops functions - Use xilinx_wdt prefix in start/stop/keepalive functions and in new structures Signed-off-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
parent
70605d9bab
commit
d14fd96455
drivers/watchdog
@ -1026,6 +1026,7 @@ config M54xx_WATCHDOG
|
||||
config XILINX_WATCHDOG
|
||||
tristate "Xilinx Watchdog timer"
|
||||
depends on MICROBLAZE
|
||||
select WATCHDOG_CORE
|
||||
---help---
|
||||
Watchdog driver for the xps_timebase_wdt ip core.
|
||||
|
||||
|
@ -1,6 +1,7 @@
|
||||
/*
|
||||
* Watchdog Device Driver for Xilinx axi/xps_timebase_wdt
|
||||
*
|
||||
* (C) Copyright 2013 - 2014 Xilinx, Inc.
|
||||
* (C) Copyright 2011 (Alejandro Cabrera <aldaya@gmail.com>)
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
@ -14,12 +15,9 @@
|
||||
#include <linux/module.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/ioport.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/of_device.h>
|
||||
#include <linux/of_address.h>
|
||||
@ -47,22 +45,18 @@
|
||||
struct xwdt_device {
|
||||
struct resource res;
|
||||
void __iomem *base;
|
||||
u32 nowayout;
|
||||
u32 wdt_interval;
|
||||
u32 boot_status;
|
||||
};
|
||||
|
||||
static struct xwdt_device xdev;
|
||||
|
||||
static u32 timeout;
|
||||
static u32 control_status_reg;
|
||||
static u8 expect_close;
|
||||
static u8 no_timeout;
|
||||
static unsigned long driver_open;
|
||||
|
||||
static DEFINE_SPINLOCK(spinlock);
|
||||
|
||||
static void xwdt_start(void)
|
||||
static int xilinx_wdt_start(struct watchdog_device *wdd)
|
||||
{
|
||||
spin_lock(&spinlock);
|
||||
|
||||
@ -76,9 +70,11 @@ static void xwdt_start(void)
|
||||
iowrite32(XWT_CSRX_EWDT2_MASK, xdev.base + XWT_TWCSR1_OFFSET);
|
||||
|
||||
spin_unlock(&spinlock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void xwdt_stop(void)
|
||||
static int xilinx_wdt_stop(struct watchdog_device *wdd)
|
||||
{
|
||||
spin_lock(&spinlock);
|
||||
|
||||
@ -91,9 +87,11 @@ static void xwdt_stop(void)
|
||||
|
||||
spin_unlock(&spinlock);
|
||||
pr_info("Stopped!\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void xwdt_keepalive(void)
|
||||
static int xilinx_wdt_keepalive(struct watchdog_device *wdd)
|
||||
{
|
||||
spin_lock(&spinlock);
|
||||
|
||||
@ -102,23 +100,28 @@ static void xwdt_keepalive(void)
|
||||
iowrite32(control_status_reg, xdev.base + XWT_TWCSR0_OFFSET);
|
||||
|
||||
spin_unlock(&spinlock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void xwdt_get_status(int *status)
|
||||
{
|
||||
int new_status;
|
||||
static const struct watchdog_info xilinx_wdt_ident = {
|
||||
.options = WDIOF_MAGICCLOSE |
|
||||
WDIOF_KEEPALIVEPING,
|
||||
.firmware_version = 1,
|
||||
.identity = WATCHDOG_NAME,
|
||||
};
|
||||
|
||||
spin_lock(&spinlock);
|
||||
static const struct watchdog_ops xilinx_wdt_ops = {
|
||||
.owner = THIS_MODULE,
|
||||
.start = xilinx_wdt_start,
|
||||
.stop = xilinx_wdt_stop,
|
||||
.ping = xilinx_wdt_keepalive,
|
||||
};
|
||||
|
||||
control_status_reg = ioread32(xdev.base + XWT_TWCSR0_OFFSET);
|
||||
new_status = ((control_status_reg &
|
||||
(XWT_CSR0_WRS_MASK | XWT_CSR0_WDS_MASK)) != 0);
|
||||
spin_unlock(&spinlock);
|
||||
|
||||
*status = 0;
|
||||
if (new_status & 1)
|
||||
*status |= WDIOF_CARDRESET;
|
||||
}
|
||||
static struct watchdog_device xilinx_wdt_wdd = {
|
||||
.info = &xilinx_wdt_ident,
|
||||
.ops = &xilinx_wdt_ops,
|
||||
};
|
||||
|
||||
static u32 xwdt_selftest(void)
|
||||
{
|
||||
@ -145,139 +148,6 @@ static u32 xwdt_selftest(void)
|
||||
return XWT_TIMER_FAILED;
|
||||
}
|
||||
|
||||
static int xwdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
/* Only one process can handle the wdt at a time */
|
||||
if (test_and_set_bit(0, &driver_open))
|
||||
return -EBUSY;
|
||||
|
||||
/* Make sure that the module are always loaded...*/
|
||||
if (xdev.nowayout)
|
||||
__module_get(THIS_MODULE);
|
||||
|
||||
xwdt_start();
|
||||
pr_info("Started...\n");
|
||||
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static int xwdt_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (expect_close == 42) {
|
||||
xwdt_stop();
|
||||
} else {
|
||||
pr_crit("Unexpected close, not stopping watchdog!\n");
|
||||
xwdt_keepalive();
|
||||
}
|
||||
|
||||
clear_bit(0, &driver_open);
|
||||
expect_close = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* xwdt_write:
|
||||
* @file: file handle to the watchdog
|
||||
* @buf: buffer to write (unused as data does not matter here
|
||||
* @count: count of bytes
|
||||
* @ppos: pointer to the position to write. No seeks allowed
|
||||
*
|
||||
* A write to a watchdog device is defined as a keepalive signal. Any
|
||||
* write of data will do, as we don't define content meaning.
|
||||
*/
|
||||
static ssize_t xwdt_write(struct file *file, const char __user *buf,
|
||||
size_t len, loff_t *ppos)
|
||||
{
|
||||
if (len) {
|
||||
if (!xdev.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, buf + i))
|
||||
return -EFAULT;
|
||||
if (c == 'V')
|
||||
expect_close = 42;
|
||||
}
|
||||
}
|
||||
xwdt_keepalive();
|
||||
}
|
||||
return len;
|
||||
}
|
||||
|
||||
static const struct watchdog_info ident = {
|
||||
.options = WDIOF_MAGICCLOSE |
|
||||
WDIOF_KEEPALIVEPING,
|
||||
.firmware_version = 1,
|
||||
.identity = WATCHDOG_NAME,
|
||||
};
|
||||
|
||||
/*
|
||||
* xwdt_ioctl:
|
||||
* @file: file handle to the device
|
||||
* @cmd: watchdog command
|
||||
* @arg: argument pointer
|
||||
*
|
||||
* The watchdog API defines a common set of functions for all watchdogs
|
||||
* according to their available features.
|
||||
*/
|
||||
static long xwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
int status;
|
||||
|
||||
union {
|
||||
struct watchdog_info __user *ident;
|
||||
int __user *i;
|
||||
} uarg;
|
||||
|
||||
uarg.i = (int __user *)arg;
|
||||
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
return copy_to_user(uarg.ident, &ident,
|
||||
sizeof(ident)) ? -EFAULT : 0;
|
||||
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
return put_user(xdev.boot_status, uarg.i);
|
||||
|
||||
case WDIOC_GETSTATUS:
|
||||
xwdt_get_status(&status);
|
||||
return put_user(status, uarg.i);
|
||||
|
||||
case WDIOC_KEEPALIVE:
|
||||
xwdt_keepalive();
|
||||
return 0;
|
||||
|
||||
case WDIOC_GETTIMEOUT:
|
||||
if (no_timeout)
|
||||
return -ENOTTY;
|
||||
else
|
||||
return put_user(timeout, uarg.i);
|
||||
|
||||
default:
|
||||
return -ENOTTY;
|
||||
}
|
||||
}
|
||||
|
||||
static const struct file_operations xwdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = xwdt_write,
|
||||
.open = xwdt_open,
|
||||
.release = xwdt_release,
|
||||
.unlocked_ioctl = xwdt_ioctl,
|
||||
};
|
||||
|
||||
static struct miscdevice xwdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &xwdt_fops,
|
||||
};
|
||||
|
||||
static int xwdt_probe(struct platform_device *pdev)
|
||||
{
|
||||
int rc;
|
||||
@ -313,7 +183,7 @@ static int xwdt_probe(struct platform_device *pdev)
|
||||
"xlnx,wdt-enable-once", NULL);
|
||||
if (tmptr == NULL) {
|
||||
pr_warn("Parameter \"xlnx,wdt-enable-once\" not found in device tree!\n");
|
||||
xdev.nowayout = WATCHDOG_NOWAYOUT;
|
||||
watchdog_set_nowayout(&xilinx_wdt_wdd, true);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -343,24 +213,14 @@ static int xwdt_probe(struct platform_device *pdev)
|
||||
goto unmap_io;
|
||||
}
|
||||
|
||||
xwdt_get_status(&xdev.boot_status);
|
||||
|
||||
rc = misc_register(&xwdt_miscdev);
|
||||
rc = watchdog_register_device(&xilinx_wdt_wdd);
|
||||
if (rc) {
|
||||
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
||||
xwdt_miscdev.minor, rc);
|
||||
pr_err("cannot register watchdog (err=%d)\n", rc);
|
||||
goto unmap_io;
|
||||
}
|
||||
|
||||
if (no_timeout)
|
||||
pr_info("driver loaded (timeout=? sec, nowayout=%d)\n",
|
||||
xdev.nowayout);
|
||||
else
|
||||
pr_info("driver loaded (timeout=%d sec, nowayout=%d)\n",
|
||||
timeout, xdev.nowayout);
|
||||
|
||||
expect_close = 0;
|
||||
clear_bit(0, &driver_open);
|
||||
dev_info(&pdev->dev, "Xilinx Watchdog Timer at %p with timeout %ds\n",
|
||||
xdev.base, timeout);
|
||||
|
||||
return 0;
|
||||
|
||||
@ -374,7 +234,7 @@ static int xwdt_probe(struct platform_device *pdev)
|
||||
|
||||
static int xwdt_remove(struct platform_device *dev)
|
||||
{
|
||||
misc_deregister(&xwdt_miscdev);
|
||||
watchdog_unregister_device(&xilinx_wdt_wdd);
|
||||
iounmap(xdev.base);
|
||||
release_mem_region(xdev.res.start, resource_size(&xdev.res));
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user