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c9a0c8a684
orion5x_wdt no longer compiled after the changes in commit
ebe35aff88
("Orion: prepare for
runtime-determined timer tick rate").
The tick rate define (ORION5X_TCLK) was removed in favor of a runtime
detection. The quick fix is to add the define in the watchdog driver.
The fix is not correct for all supported orion5x platforms, but since
the supported platforms right now are 133 Mhz and 166 Mhz, it won't
be _that_ far off. ;-) A fix that uses the runtime-determined timer
tick rate will be applied later.
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Cc: Kristof Provost <kristof@sigsegv.be>
Acked-by: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: Nicolas Pitre <nico@cam.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
247 lines
5.1 KiB
C
247 lines
5.1 KiB
C
/*
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* drivers/watchdog/orion5x_wdt.c
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*
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* Watchdog driver for Orion5x processors
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*
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* Author: Sylver Bruneau <sylver.bruneau@googlemail.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/module.h>
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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/uaccess.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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/*
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* Watchdog timer block registers.
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*/
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#define TIMER_CTRL (TIMER_VIRT_BASE + 0x0000)
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#define WDT_EN 0x0010
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#define WDT_VAL (TIMER_VIRT_BASE + 0x0024)
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#define ORION5X_TCLK 166666667
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#define WDT_MAX_DURATION (0xffffffff / ORION5X_TCLK)
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#define WDT_IN_USE 0
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#define WDT_OK_TO_CLOSE 1
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static int nowayout = WATCHDOG_NOWAYOUT;
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static int heartbeat = WDT_MAX_DURATION; /* (seconds) */
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static unsigned long wdt_status;
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static spinlock_t wdt_lock;
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static void wdt_enable(void)
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{
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u32 reg;
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spin_lock(&wdt_lock);
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/* Set watchdog duration */
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writel(ORION5X_TCLK * heartbeat, WDT_VAL);
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/* Clear watchdog timer interrupt */
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reg = readl(BRIDGE_CAUSE);
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reg &= ~WDT_INT_REQ;
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writel(reg, BRIDGE_CAUSE);
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/* Enable watchdog timer */
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reg = readl(TIMER_CTRL);
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reg |= WDT_EN;
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writel(reg, TIMER_CTRL);
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/* Enable reset on watchdog */
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reg = readl(CPU_RESET_MASK);
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reg |= WDT_RESET;
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writel(reg, CPU_RESET_MASK);
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spin_unlock(&wdt_lock);
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}
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static void wdt_disable(void)
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{
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u32 reg;
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spin_lock(&wdt_lock);
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/* Disable reset on watchdog */
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reg = readl(CPU_RESET_MASK);
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reg &= ~WDT_RESET;
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writel(reg, CPU_RESET_MASK);
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/* Disable watchdog timer */
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reg = readl(TIMER_CTRL);
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reg &= ~WDT_EN;
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writel(reg, TIMER_CTRL);
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spin_unlock(&wdt_lock);
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}
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static int orion5x_wdt_get_timeleft(int *time_left)
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{
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spin_lock(&wdt_lock);
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*time_left = readl(WDT_VAL) / ORION5X_TCLK;
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spin_unlock(&wdt_lock);
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return 0;
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}
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static int orion5x_wdt_open(struct inode *inode, struct file *file)
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{
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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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wdt_enable();
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return nonseekable_open(inode, file);
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}
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static ssize_t orion5x_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 struct watchdog_info ident = {
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.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING,
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.identity = "Orion5x Watchdog",
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};
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static long orion5x_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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case WDIOC_GETBOOTSTATUS:
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ret = put_user(0, (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 > WDT_MAX_DURATION) {
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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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case WDIOC_GETTIMELEFT:
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if (orion5x_wdt_get_timeleft(&time)) {
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ret = -EINVAL;
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break;
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}
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ret = put_user(time, (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 orion5x_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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wdt_disable();
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else
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printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
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"timer will not stop\n");
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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 orion5x_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = orion5x_wdt_write,
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.unlocked_ioctl = orion5x_wdt_ioctl,
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.open = orion5x_wdt_open,
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.release = orion5x_wdt_release,
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};
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static struct miscdevice orion5x_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &orion5x_wdt_fops,
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};
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static int __init orion5x_wdt_init(void)
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{
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int ret;
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spin_lock_init(&wdt_lock);
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ret = misc_register(&orion5x_wdt_miscdev);
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if (ret == 0)
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printk("Orion5x Watchdog Timer: heartbeat %d sec\n",
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heartbeat);
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return ret;
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}
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static void __exit orion5x_wdt_exit(void)
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{
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misc_deregister(&orion5x_wdt_miscdev);
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}
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module_init(orion5x_wdt_init);
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module_exit(orion5x_wdt_exit);
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MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>");
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MODULE_DESCRIPTION("Orion5x Processor Watchdog");
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default is "
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__MODULE_STRING(WDT_MAX_DURATION) ")");
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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