* Based on sa1100 driver,
* Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
*
- * 2005-2006 (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.
+ * 2005-2006 (c) MontaVista Software, Inc.
+ *
+ * (C) 2012 Wolfram Sang, Pengutronix
+ *
+ * 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.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
-#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/init.h>
-#include <linux/bitops.h>
-#include <linux/ioport.h>
-#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/spinlock.h>
-#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/slab.h>
+#include <linux/err.h>
#include <mach/hardware.h>
-#define MODULE_NAME "PNX4008-WDT: "
-
/* WatchDog Timer - Chapter 23 Page 207 */
#define DEFAULT_HEARTBEAT 19
#define WDOG_COUNTER_RATE 13000000 /*the counter clock is 13 MHz fixed */
-static int nowayout = WATCHDOG_NOWAYOUT;
-static int heartbeat = DEFAULT_HEARTBEAT;
+static bool nowayout = WATCHDOG_NOWAYOUT;
+static unsigned int heartbeat = DEFAULT_HEARTBEAT;
static DEFINE_SPINLOCK(io_lock);
-static unsigned long wdt_status;
-#define WDT_IN_USE 0
-#define WDT_OK_TO_CLOSE 1
-#define WDT_REGION_INITED 2
-#define WDT_DEVICE_INITED 3
-
-static unsigned long boot_status;
-
-static struct resource *wdt_mem;
static void __iomem *wdt_base;
struct clk *wdt_clk;
-static void wdt_enable(void)
+static int pnx4008_wdt_start(struct watchdog_device *wdd)
{
spin_lock(&io_lock);
/* stop counter, initiate counter reset */
- __raw_writel(RESET_COUNT, WDTIM_CTRL(wdt_base));
+ writel(RESET_COUNT, WDTIM_CTRL(wdt_base));
/*wait for reset to complete. 100% guarantee event */
- while (__raw_readl(WDTIM_COUNTER(wdt_base)))
+ while (readl(WDTIM_COUNTER(wdt_base)))
cpu_relax();
/* internal and external reset, stop after that */
- __raw_writel(M_RES2 | STOP_COUNT0 | RESET_COUNT0,
- WDTIM_MCTRL(wdt_base));
+ writel(M_RES2 | STOP_COUNT0 | RESET_COUNT0, WDTIM_MCTRL(wdt_base));
/* configure match output */
- __raw_writel(MATCH_OUTPUT_HIGH, WDTIM_EMR(wdt_base));
+ writel(MATCH_OUTPUT_HIGH, WDTIM_EMR(wdt_base));
/* clear interrupt, just in case */
- __raw_writel(MATCH_INT, WDTIM_INT(wdt_base));
+ writel(MATCH_INT, WDTIM_INT(wdt_base));
/* the longest pulse period 65541/(13*10^6) seconds ~ 5 ms. */
- __raw_writel(0xFFFF, WDTIM_PULSE(wdt_base));
- __raw_writel(heartbeat * WDOG_COUNTER_RATE, WDTIM_MATCH0(wdt_base));
+ writel(0xFFFF, WDTIM_PULSE(wdt_base));
+ writel(wdd->timeout * WDOG_COUNTER_RATE, WDTIM_MATCH0(wdt_base));
/*enable counter, stop when debugger active */
- __raw_writel(COUNT_ENAB | DEBUG_EN, WDTIM_CTRL(wdt_base));
+ writel(COUNT_ENAB | DEBUG_EN, WDTIM_CTRL(wdt_base));
spin_unlock(&io_lock);
+ return 0;
}
-static void wdt_disable(void)
+static int pnx4008_wdt_stop(struct watchdog_device *wdd)
{
spin_lock(&io_lock);
- __raw_writel(0, WDTIM_CTRL(wdt_base)); /*stop counter */
+ writel(0, WDTIM_CTRL(wdt_base)); /*stop counter */
spin_unlock(&io_lock);
+ return 0;
}
-static int pnx4008_wdt_open(struct inode *inode, struct file *file)
-{
- int ret;
-
- if (test_and_set_bit(WDT_IN_USE, &wdt_status))
- return -EBUSY;
-
- clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
-
- ret = clk_enable(wdt_clk);
- if (ret) {
- clear_bit(WDT_IN_USE, &wdt_status);
- return ret;
- }
-
- wdt_enable();
-
- return nonseekable_open(inode, file);
-}
-
-static ssize_t pnx4008_wdt_write(struct file *file, const char *data,
- size_t len, loff_t *ppos)
+static int pnx4008_wdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int new_timeout)
{
- if (len) {
- if (!nowayout) {
- size_t i;
-
- clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
-
- for (i = 0; i != len; i++) {
- char c;
-
- if (get_user(c, data + i))
- return -EFAULT;
- if (c == 'V')
- set_bit(WDT_OK_TO_CLOSE, &wdt_status);
- }
- }
- wdt_enable();
- }
-
- return len;
+ wdd->timeout = new_timeout;
+ return 0;
}
-static const struct watchdog_info ident = {
+static const struct watchdog_info pnx4008_wdt_ident = {
.options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
.identity = "PNX4008 Watchdog",
};
-static long pnx4008_wdt_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- int ret = -ENOTTY;
- int time;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- ret = copy_to_user((struct watchdog_info *)arg, &ident,
- sizeof(ident)) ? -EFAULT : 0;
- break;
-
- case WDIOC_GETSTATUS:
- ret = put_user(0, (int *)arg);
- break;
-
- case WDIOC_GETBOOTSTATUS:
- ret = put_user(boot_status, (int *)arg);
- break;
-
- case WDIOC_KEEPALIVE:
- wdt_enable();
- ret = 0;
- break;
-
- case WDIOC_SETTIMEOUT:
- ret = get_user(time, (int *)arg);
- if (ret)
- break;
-
- if (time <= 0 || time > MAX_HEARTBEAT) {
- ret = -EINVAL;
- break;
- }
-
- heartbeat = time;
- wdt_enable();
- /* Fall through */
-
- case WDIOC_GETTIMEOUT:
- ret = put_user(heartbeat, (int *)arg);
- break;
- }
- return ret;
-}
-
-static int pnx4008_wdt_release(struct inode *inode, struct file *file)
-{
- if (!test_bit(WDT_OK_TO_CLOSE, &wdt_status))
- printk(KERN_WARNING "WATCHDOG: Device closed unexpectedly\n");
-
- wdt_disable();
- clk_disable(wdt_clk);
- clear_bit(WDT_IN_USE, &wdt_status);
- clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
-
- return 0;
-}
-
-static const struct file_operations pnx4008_wdt_fops = {
+static const struct watchdog_ops pnx4008_wdt_ops = {
.owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = pnx4008_wdt_write,
- .unlocked_ioctl = pnx4008_wdt_ioctl,
- .open = pnx4008_wdt_open,
- .release = pnx4008_wdt_release,
+ .start = pnx4008_wdt_start,
+ .stop = pnx4008_wdt_stop,
+ .set_timeout = pnx4008_wdt_set_timeout,
};
-static struct miscdevice pnx4008_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &pnx4008_wdt_fops,
+static struct watchdog_device pnx4008_wdd = {
+ .info = &pnx4008_wdt_ident,
+ .ops = &pnx4008_wdt_ops,
+ .min_timeout = 1,
+ .max_timeout = MAX_HEARTBEAT,
};
static int __devinit pnx4008_wdt_probe(struct platform_device *pdev)
{
- int ret = 0, size;
+ struct resource *r;
+ int ret = 0;
if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
heartbeat = DEFAULT_HEARTBEAT;
- printk(KERN_INFO MODULE_NAME
- "PNX4008 Watchdog Timer: heartbeat %d sec\n", heartbeat);
-
- wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (wdt_mem == NULL) {
- printk(KERN_INFO MODULE_NAME
- "failed to get memory region resource\n");
- return -ENOENT;
- }
-
- size = resource_size(wdt_mem);
-
- if (!request_mem_region(wdt_mem->start, size, pdev->name)) {
- printk(KERN_INFO MODULE_NAME "failed to get memory region\n");
- return -ENOENT;
- }
- wdt_base = (void __iomem *)IO_ADDRESS(wdt_mem->start);
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ wdt_base = devm_request_and_ioremap(&pdev->dev, r);
+ if (!wdt_base)
+ return -EADDRINUSE;
wdt_clk = clk_get(&pdev->dev, NULL);
- if (IS_ERR(wdt_clk)) {
- ret = PTR_ERR(wdt_clk);
- release_mem_region(wdt_mem->start, size);
- wdt_mem = NULL;
- goto out;
- }
+ if (IS_ERR(wdt_clk))
+ return PTR_ERR(wdt_clk);
ret = clk_enable(wdt_clk);
- if (ret) {
- release_mem_region(wdt_mem->start, size);
- wdt_mem = NULL;
- clk_put(wdt_clk);
+ if (ret)
goto out;
- }
- ret = misc_register(&pnx4008_wdt_miscdev);
+ pnx4008_wdd.timeout = heartbeat;
+ pnx4008_wdd.bootstatus = (readl(WDTIM_RES(wdt_base)) & WDOG_RESET) ?
+ WDIOF_CARDRESET : 0;
+ watchdog_set_nowayout(&pnx4008_wdd, nowayout);
+
+ pnx4008_wdt_stop(&pnx4008_wdd); /* disable for now */
+
+ ret = watchdog_register_device(&pnx4008_wdd);
if (ret < 0) {
- printk(KERN_ERR MODULE_NAME "cannot register misc device\n");
- release_mem_region(wdt_mem->start, size);
- wdt_mem = NULL;
- clk_disable(wdt_clk);
- clk_put(wdt_clk);
- } else {
- boot_status = (__raw_readl(WDTIM_RES(wdt_base)) & WDOG_RESET) ?
- WDIOF_CARDRESET : 0;
- wdt_disable(); /*disable for now */
- clk_disable(wdt_clk);
- set_bit(WDT_DEVICE_INITED, &wdt_status);
+ dev_err(&pdev->dev, "cannot register watchdog device\n");
+ goto disable_clk;
}
+ dev_info(&pdev->dev, "PNX4008 Watchdog Timer: heartbeat %d sec\n",
+ heartbeat);
+
+ return 0;
+
+disable_clk:
+ clk_disable(wdt_clk);
out:
+ clk_put(wdt_clk);
return ret;
}
static int __devexit pnx4008_wdt_remove(struct platform_device *pdev)
{
- misc_deregister(&pnx4008_wdt_miscdev);
+ watchdog_unregister_device(&pnx4008_wdd);
clk_disable(wdt_clk);
clk_put(wdt_clk);
- if (wdt_mem) {
- release_mem_region(wdt_mem->start, resource_size(wdt_mem));
- wdt_mem = NULL;
- }
return 0;
}
module_platform_driver(platform_wdt_driver);
MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
+MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
MODULE_DESCRIPTION("PNX4008 Watchdog Driver");
-module_param(heartbeat, int, 0);
+module_param(heartbeat, uint, 0);
MODULE_PARM_DESC(heartbeat,
"Watchdog heartbeat period in seconds from 1 to "
__MODULE_STRING(MAX_HEARTBEAT) ", default "
__MODULE_STRING(DEFAULT_HEARTBEAT));
-module_param(nowayout, int, 0);
+module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout,
"Set to 1 to keep watchdog running after device release");
projects / karo-tx-linux.git / blobdiff