fix the watchdog driver and enable it by default
SVN-Revision: 16394
This commit is contained in:
Florian Fainelli
parent
01118457e8
commit
972619416e
2 changed files with 140 additions and 123 deletions
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@ -19,6 +19,7 @@ CONFIG_BCM63XX_CPU_6348=y
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CONFIG_BCM63XX_CPU_6358=y
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CONFIG_BCM63XX_ENET=y
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CONFIG_BCM63XX_PHY=y
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CONFIG_BCM63XX_WDT=y
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CONFIG_BITREVERSE=y
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CONFIG_BLK_DEV_IO_TRACE=y
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CONFIG_BOARD_BCM963XX=y
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@ -59,7 +60,6 @@ CONFIG_CPU_SUPPORTS_HIGHMEM=y
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# CONFIG_CPU_VR41XX is not set
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CONFIG_CRAMFS=y
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CONFIG_CSRC_R4K=y
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CONFIG_DEFAULT_BIC=y
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CONFIG_DEFAULT_CFQ=y
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# CONFIG_DEFAULT_DEADLINE is not set
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CONFIG_DEFAULT_IOSCHED="cfq"
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@ -106,7 +106,6 @@ CONFIG_INOTIFY=y
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CONFIG_INOTIFY_USER=y
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CONFIG_IOSCHED_CFQ=y
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# CONFIG_IOSCHED_DEADLINE is not set
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CONFIG_IP_MROUTE=y
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CONFIG_IP_PIMSM_V1=y
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CONFIG_IP_PIMSM_V2=y
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CONFIG_IRQ_CPU=y
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@ -198,12 +197,11 @@ CONFIG_SYS_SUPPORTS_BIG_ENDIAN=y
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CONFIG_TICK_ONESHOT=y
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CONFIG_TRAD_SIGNALS=y
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CONFIG_USB_EHCI_BIG_ENDIAN_MMIO=y
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# CONFIG_USB_EHCI_ROOT_HUB_TT is not set
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CONFIG_USB_OHCI_BIG_ENDIAN_DESC=y
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CONFIG_USB_OHCI_BIG_ENDIAN_MMIO=y
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CONFIG_USB_SUPPORT=y
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# CONFIG_VGASTATE is not set
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# CONFIG_VIA_RHINE is not set
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CONFIG_VM_EVENT_COUNTERS=y
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# CONFIG_WATCHDOG is not set
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CONFIG_WATCHDOG_NOWAYOUT=y
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CONFIG_ZONE_DMA_FLAG=0
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@ -10,19 +10,22 @@
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/reboot.h>
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#include <linux/smp_lock.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/reboot.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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#include <linux/timer.h>
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#include <linux/jiffies.h>
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#include <linux/resource.h>
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#include <linux/platform_device.h>
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#include <bcm63xx_cpu.h>
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#include <bcm63xx_io.h>
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@ -31,78 +34,74 @@
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#define PFX KBUILD_MODNAME
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#define WDT_HZ 50000000 /* Fclk */
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#define WDT_INTERVAL (40) /* in seconds */
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#define WDT_DEFAULT_TIME 30 /* seconds */
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#define WDT_MAX_TIME 256 /* seconds */
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static struct {
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void __iomem *regs;
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struct completion stop;
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int running;
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struct timer_list timer;
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int queue;
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int default_ticks;
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unsigned long inuse;
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atomic_t ticks;
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} bcm63xx_wdt_device;
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static int ticks = 100 * WDT_HZ;
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static int expect_close;
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static int timeout;
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static int wdt_time = WDT_DEFAULT_TIME;
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static void bcm63xx_wdt_toggle(void)
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/* HW functions */
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static void bcm63xx_wdt_hw_start(void)
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{
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bcm_writel(0xffffffff, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
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bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
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bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
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}
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static void bcm63xx_wdt_hw_stop(void)
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{
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bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
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bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
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}
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static void bcm63xx_timer_tick(unsigned long unused)
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{
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if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) {
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bcm63xx_wdt_hw_start();
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mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ);
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} else
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printk(KERN_CRIT PFX "watchdog will restart system\n");
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}
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static void bcm63xx_wdt_pet(void)
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{
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atomic_set(&bcm63xx_wdt_device.ticks, wdt_time);
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}
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static void bcm63xx_wdt_start(void)
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{
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if (!bcm63xx_wdt_device.inuse) {
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bcm63xx_wdt_toggle();
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mod_timer(&bcm63xx_wdt_device.timer, jiffies + WDT_INTERVAL);
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}
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bcm63xx_wdt_device.running++;
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bcm63xx_wdt_pet();
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bcm63xx_timer_tick(0);
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}
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static void bcm63xx_wdt_stop(void)
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static void bcm63xx_wdt_pause(void)
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{
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if (bcm63xx_wdt_device.running) {
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bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
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bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
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bcm63xx_wdt_device.running = 0;
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}
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del_timer_sync(&bcm63xx_wdt_device.timer);
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bcm63xx_wdt_hw_stop();
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}
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static void bcm63xx_wdt_set(int new_timeout)
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static int bcm63xx_wdt_settimeout(int new_time)
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{
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new_timeout *= WDT_HZ;
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bcm_writel(new_timeout, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
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}
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if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
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return -EINVAL;
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static void bcm63xx_wdt_reset(void)
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{
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ticks = bcm63xx_wdt_device.default_ticks;
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}
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wdt_time = new_time;
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static void bcm63xx_wdt_update(unsigned long unused)
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{
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if (bcm63xx_wdt_device.running)
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ticks--;
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bcm63xx_wdt_toggle();
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if (bcm63xx_wdt_device.queue && ticks)
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mod_timer(&bcm63xx_wdt_device.timer,
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jiffies + WDT_INTERVAL);
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else
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complete(&bcm63xx_wdt_device.stop);
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return 0;
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}
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static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
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@ -110,23 +109,21 @@ static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
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if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
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return -EBUSY;
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if (nowayout)
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__module_get(THIS_MODULE);
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bcm63xx_wdt_start();
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return nonseekable_open(inode, file);
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}
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static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
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{
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if (expect_close && nowayout == 0) {
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bcm63xx_wdt_stop();
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printk(KERN_INFO PFX ": disabling watchdog timer\n");
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module_put(THIS_MODULE);
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} else
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if (expect_close == 42)
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bcm63xx_wdt_pause();
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else {
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printk(KERN_CRIT PFX
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": device closed unexpectedly. WDT will not stop !\n");
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": Unexpected close, not stopping watchdog!\n");
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bcm63xx_wdt_start();
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}
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clear_bit(0, &bcm63xx_wdt_device.inuse);
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expect_close = 0;
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return 0;
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}
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@ -145,70 +142,81 @@ static ssize_t bcm63xx_wdt_write(struct file *file, const char *data,
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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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expect_close = 1;
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expect_close = 42;
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}
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}
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bcm63xx_wdt_update(0);
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return len;
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bcm63xx_wdt_pet();
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}
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return 0;
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return len;
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}
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static struct watchdog_info bcm63xx_wdt_info = {
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.identity = PFX,
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.options = WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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};
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static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int new_timeout;
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unsigned int value;
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static struct watchdog_info ident = {
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.options = WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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.identity = "BCM63xx Watchdog",
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};
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int __user *p = argp;
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int new_value, retval = -EINVAL;
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switch (cmd) {
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case WDIOC_KEEPALIVE:
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bcm63xx_wdt_reset();
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break;
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &bcm63xx_wdt_info,
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sizeof(bcm63xx_wdt_info)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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value = bcm_readl(bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
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if (copy_to_user(argp, &value, sizeof(int)))
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return -EFAULT;
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break;
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &ident, sizeof(ident)))
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return -EFAULT;
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break;
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return put_user(0, p);
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case WDIOC_SETOPTIONS:
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if (copy_from_user(&value, argp, sizeof(int)))
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if (get_user(new_value, p))
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return -EFAULT;
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switch (value) {
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case WDIOS_ENABLECARD:
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bcm63xx_wdt_start();
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break;
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case WDIOS_DISABLECARD:
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bcm63xx_wdt_stop();
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default:
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return -EINVAL;
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if (new_value & WDIOS_DISABLECARD) {
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bcm63xx_wdt_pause();
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retval = 0;
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}
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break;
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if (new_value & WDIOS_ENABLECARD) {
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bcm63xx_wdt_start();
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retval = 0;
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}
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return retval;
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case WDIOC_KEEPALIVE:
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bcm63xx_wdt_pet();
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return 0;
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case WDIOC_SETTIMEOUT:
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if (copy_from_user(&new_timeout, argp, sizeof(int)))
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if (get_user(new_value, p))
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return -EFAULT;
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if (new_timeout < 5)
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if (bcm63xx_wdt_settimeout(new_value))
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return -EINVAL;
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if (new_timeout > 40)
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return -EINVAL;
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bcm63xx_wdt_set(new_timeout);
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bcm63xx_wdt_toggle();
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bcm63xx_wdt_pet();
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case WDIOC_GETTIMEOUT:
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return copy_to_user(argp, &timeout, sizeof(int));
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return put_user(wdt_time, p);
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default:
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return -ENOTTY;
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}
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return 0;
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}
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}
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static int bcm63xx_wdt_notify_sys(struct notifier_block *this,
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unsigned long code, void *unused)
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{
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if (code == SYS_DOWN || code == SYS_HALT)
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bcm63xx_wdt_pause();
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return NOTIFY_DONE;
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}
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static struct file_operations bcm63xx_wdt_fops = {
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@ -226,11 +234,18 @@ static struct miscdevice bcm63xx_wdt_miscdev = {
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.fops = &bcm63xx_wdt_fops,
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};
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static struct notifier_block bcm63xx_wdt_notifier = {
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.notifier_call = bcm63xx_wdt_notify_sys,
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};
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static int bcm63xx_wdt_probe(struct platform_device *pdev)
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{
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int ret;
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struct resource *r;
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setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_timer_tick, 0L);
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r) {
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printk(KERN_ERR PFX
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@ -245,6 +260,20 @@ static int bcm63xx_wdt_probe(struct platform_device *pdev)
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return -ENXIO;
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}
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if (bcm63xx_wdt_settimeout(wdt_time)) {
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bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME);
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printk(KERN_INFO PFX
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": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
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wdt_time);
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}
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ret = register_reboot_notifier(&bcm63xx_wdt_notifier);
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if (ret) {
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printk(KERN_ERR PFX
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"failed to register reboot_notifier\n");
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return ret;
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}
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ret = misc_register(&bcm63xx_wdt_miscdev);
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if (ret < 0) {
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printk(KERN_ERR PFX
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@ -252,37 +281,27 @@ static int bcm63xx_wdt_probe(struct platform_device *pdev)
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goto unmap;
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}
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init_completion(&bcm63xx_wdt_device.stop);
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bcm63xx_wdt_device.queue = 0;
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clear_bit(0, &bcm63xx_wdt_device.inuse);
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setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_wdt_update, 0L);
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bcm63xx_wdt_device.default_ticks = ticks;
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bcm63xx_wdt_set(ticks);
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bcm63xx_wdt_start();
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printk(KERN_INFO PFX " started, timer margin: %d sec\n", WDT_INTERVAL);
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printk(KERN_INFO PFX " started, timer margin: %d sec\n", WDT_DEFAULT_TIME);
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return 0;
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unmap:
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unregister_reboot_notifier(&bcm63xx_wdt_notifier);
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iounmap(bcm63xx_wdt_device.regs);
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return ret;
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}
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static int bcm63xx_wdt_remove(struct platform_device *pdev)
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{
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if (bcm63xx_wdt_device.queue) {
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bcm63xx_wdt_device.queue = 0;
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wait_for_completion(&bcm63xx_wdt_device.stop);
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}
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if (!nowayout)
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bcm63xx_wdt_pause();
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misc_deregister(&bcm63xx_wdt_miscdev);
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iounmap(bcm63xx_wdt_device.regs);
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unregister_reboot_notifier(&bcm63xx_wdt_notifier);
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return 0;
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}
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