watchdog: pnx4008: convert driver to use the watchdog framework
Make this driver a user of the watchdog framework and remove parts now handled by the core. Tested on a custom lpc32xx-board. [wim@iguana.be: Added set_timeout operation] Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Wolfram Sang
Wim Van Sebroeck
Родитель
2e51d90f4d
Коммит
6b1e83869d
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@ -235,6 +235,7 @@ config OMAP_WATCHDOG
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config PNX4008_WATCHDOG
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tristate "PNX4008 and LPC32XX Watchdog"
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depends on ARCH_PNX4008 || ARCH_LPC32XX
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select WATCHDOG_CORE
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help
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Say Y here if to include support for the watchdog timer
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in the PNX4008 or LPC32XX processor.
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@ -8,10 +8,13 @@
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* Based on sa1100 driver,
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* Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
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*
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* 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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* 2005-2006 (c) MontaVista Software, Inc.
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*
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* (C) 2012 Wolfram Sang, Pengutronix
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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@ -20,23 +23,17 @@
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/ioport.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <mach/hardware.h>
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#define MODULE_NAME "PNX4008-WDT: "
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/* WatchDog Timer - Chapter 23 Page 207 */
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#define DEFAULT_HEARTBEAT 19
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@ -80,19 +77,13 @@
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#define WDOG_COUNTER_RATE 13000000 /*the counter clock is 13 MHz fixed */
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static bool nowayout = WATCHDOG_NOWAYOUT;
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static int heartbeat = DEFAULT_HEARTBEAT;
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static unsigned int heartbeat = DEFAULT_HEARTBEAT;
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static DEFINE_SPINLOCK(io_lock);
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static unsigned long wdt_status;
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#define WDT_IN_USE 0
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#define WDT_OK_TO_CLOSE 1
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static unsigned long boot_status;
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static void __iomem *wdt_base;
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struct clk *wdt_clk;
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static void wdt_enable(void)
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static int pnx4008_wdt_start(struct watchdog_device *wdd)
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{
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spin_lock(&io_lock);
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@ -109,144 +100,48 @@ static void wdt_enable(void)
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writel(MATCH_INT, WDTIM_INT(wdt_base));
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/* the longest pulse period 65541/(13*10^6) seconds ~ 5 ms. */
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writel(0xFFFF, WDTIM_PULSE(wdt_base));
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writel(heartbeat * WDOG_COUNTER_RATE, WDTIM_MATCH0(wdt_base));
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writel(wdd->timeout * WDOG_COUNTER_RATE, WDTIM_MATCH0(wdt_base));
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/*enable counter, stop when debugger active */
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writel(COUNT_ENAB | DEBUG_EN, WDTIM_CTRL(wdt_base));
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spin_unlock(&io_lock);
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return 0;
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}
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static void wdt_disable(void)
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static int pnx4008_wdt_stop(struct watchdog_device *wdd)
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{
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spin_lock(&io_lock);
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writel(0, WDTIM_CTRL(wdt_base)); /*stop counter */
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spin_unlock(&io_lock);
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return 0;
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}
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static int pnx4008_wdt_open(struct inode *inode, struct file *file)
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static int pnx4008_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int new_timeout)
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{
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int ret;
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if (test_and_set_bit(WDT_IN_USE, &wdt_status))
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return -EBUSY;
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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ret = clk_enable(wdt_clk);
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if (ret) {
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clear_bit(WDT_IN_USE, &wdt_status);
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return ret;
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}
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wdt_enable();
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return nonseekable_open(inode, file);
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return 0;
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}
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static ssize_t pnx4008_wdt_write(struct file *file, const char *data,
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size_t len, loff_t *ppos)
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{
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if (len) {
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if (!nowayout) {
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size_t i;
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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set_bit(WDT_OK_TO_CLOSE, &wdt_status);
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}
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}
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wdt_enable();
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}
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return len;
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}
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static const struct watchdog_info ident = {
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static const struct watchdog_info pnx4008_wdt_ident = {
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.options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
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WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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.identity = "PNX4008 Watchdog",
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};
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static long pnx4008_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int ret = -ENOTTY;
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int time;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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ret = copy_to_user((struct watchdog_info *)arg, &ident,
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sizeof(ident)) ? -EFAULT : 0;
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break;
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case WDIOC_GETSTATUS:
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ret = put_user(0, (int *)arg);
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break;
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case WDIOC_GETBOOTSTATUS:
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ret = put_user(boot_status, (int *)arg);
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break;
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case WDIOC_KEEPALIVE:
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wdt_enable();
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ret = 0;
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break;
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case WDIOC_SETTIMEOUT:
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ret = get_user(time, (int *)arg);
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if (ret)
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break;
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if (time <= 0 || time > MAX_HEARTBEAT) {
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ret = -EINVAL;
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break;
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}
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heartbeat = time;
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wdt_enable();
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/* Fall through */
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case WDIOC_GETTIMEOUT:
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ret = put_user(heartbeat, (int *)arg);
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break;
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}
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return ret;
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}
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static int pnx4008_wdt_release(struct inode *inode, struct file *file)
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{
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if (!test_bit(WDT_OK_TO_CLOSE, &wdt_status))
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pr_warn("Device closed unexpectedly\n");
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wdt_disable();
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clk_disable(wdt_clk);
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clear_bit(WDT_IN_USE, &wdt_status);
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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return 0;
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}
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static const struct file_operations pnx4008_wdt_fops = {
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static const struct watchdog_ops pnx4008_wdt_ops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = pnx4008_wdt_write,
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.unlocked_ioctl = pnx4008_wdt_ioctl,
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.open = pnx4008_wdt_open,
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.release = pnx4008_wdt_release,
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.start = pnx4008_wdt_start,
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.stop = pnx4008_wdt_stop,
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.set_timeout = pnx4008_wdt_set_timeout,
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};
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static struct miscdevice pnx4008_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &pnx4008_wdt_fops,
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static struct watchdog_device pnx4008_wdd = {
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.info = &pnx4008_wdt_ident,
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.ops = &pnx4008_wdt_ops,
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.min_timeout = 1,
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.max_timeout = MAX_HEARTBEAT,
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};
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static int __devinit pnx4008_wdt_probe(struct platform_device *pdev)
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@ -270,15 +165,17 @@ static int __devinit pnx4008_wdt_probe(struct platform_device *pdev)
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if (ret)
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goto out;
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boot_status = (readl(WDTIM_RES(wdt_base)) & WDOG_RESET) ?
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pnx4008_wdd.timeout = heartbeat;
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pnx4008_wdd.bootstatus = (readl(WDTIM_RES(wdt_base)) & WDOG_RESET) ?
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WDIOF_CARDRESET : 0;
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wdt_disable(); /*disable for now */
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clk_disable(wdt_clk);
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watchdog_set_nowayout(&pnx4008_wdd, nowayout);
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ret = misc_register(&pnx4008_wdt_miscdev);
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pnx4008_wdt_stop(&pnx4008_wdd); /* disable for now */
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ret = watchdog_register_device(&pnx4008_wdd);
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if (ret < 0) {
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dev_err(&pdev->dev, "cannot register misc device\n");
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goto out;
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dev_err(&pdev->dev, "cannot register watchdog device\n");
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goto disable_clk;
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}
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dev_info(&pdev->dev, "PNX4008 Watchdog Timer: heartbeat %d sec\n",
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@ -286,6 +183,8 @@ static int __devinit pnx4008_wdt_probe(struct platform_device *pdev)
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return 0;
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disable_clk:
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clk_disable(wdt_clk);
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out:
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clk_put(wdt_clk);
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return ret;
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@ -293,7 +192,7 @@ out:
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static int __devexit pnx4008_wdt_remove(struct platform_device *pdev)
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{
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misc_deregister(&pnx4008_wdt_miscdev);
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watchdog_unregister_device(&pnx4008_wdd);
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clk_disable(wdt_clk);
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clk_put(wdt_clk);
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@ -313,9 +212,10 @@ static struct platform_driver platform_wdt_driver = {
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module_platform_driver(platform_wdt_driver);
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MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
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MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
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MODULE_DESCRIPTION("PNX4008 Watchdog Driver");
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module_param(heartbeat, int, 0);
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module_param(heartbeat, uint, 0);
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MODULE_PARM_DESC(heartbeat,
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"Watchdog heartbeat period in seconds from 1 to "
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__MODULE_STRING(MAX_HEARTBEAT) ", default "
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