target/linux/cns3xxx/patches/053-cns3xxx_wdt.patch

   1 --- a/drivers/watchdog/Kconfig
   2 +++ b/drivers/watchdog/Kconfig
   3 @@ -188,7 +188,7 @@ config SA1100_WATCHDOG
   4
   5  config MPCORE_WATCHDOG
   6         tristate "MPcore watchdog"
   7 -       depends on HAVE_ARM_TWD
   8 +       depends on ARCH_CNS3XXX
   9         help
  10           Watchdog timer embedded into the MPcore system.
  11
  12 --- a/drivers/watchdog/mpcore_wdt.c
  13 +++ b/drivers/watchdog/mpcore_wdt.c
  14 @@ -32,11 +32,14 @@
  15  #include <linux/uaccess.h>
  16  #include <linux/slab.h>
  17  #include <linux/io.h>
  18 +#include <linux/jiffies.h>
  19 +#include <linux/delay.h>
  20
  21  #include <asm/smp_twd.h>
  22
  23  struct mpcore_wdt {
  24         unsigned long   timer_alive;
  25 +       unsigned long   timer_rate;
  26         struct device   *dev;
  27         void __iomem    *base;
  28         int             irq;
  29 @@ -98,14 +101,12 @@ static void mpcore_wdt_keepalive(struct
  30         unsigned long count;
  31
  32         spin_lock(&wdt_lock);
  33 -       /* Assume prescale is set to 256 */
  34 -       count =  __raw_readl(wdt->base + TWD_WDOG_COUNTER);
  35 -       count = (0xFFFFFFFFU - count) * (HZ / 5);
  36 -       count = (count / 256) * mpcore_margin;
  37 +       count = (wdt->timer_rate / 256) * mpcore_margin;
  38
  39         /* Reload the counter */
  40         writel(count + wdt->perturb, wdt->base + TWD_WDOG_LOAD);
  41         wdt->perturb = wdt->perturb ? 0 : 1;
  42 +
  43         spin_unlock(&wdt_lock);
  44  }
  45
  46 @@ -329,6 +330,8 @@ static int __devinit mpcore_wdt_probe(st
  47         struct mpcore_wdt *wdt;
  48         struct resource *res;
  49         int ret;
  50 +       unsigned long count;
  51 +       u64 waitjiffies;
  52
  53         /* We only accept one device, and it must have an id of -1 */
  54         if (dev->id != -1)
  55 @@ -375,6 +378,22 @@ static int __devinit mpcore_wdt_probe(st
  56                 goto err_irq;
  57         }
  58
  59 +       waitjiffies = get_jiffies_64() + 1;
  60 +       while (get_jiffies_64() < waitjiffies)
  61 +               udelay(10);
  62 +
  63 +       waitjiffies += 5;
  64 +
  65 +       __raw_writel(0x00000001, wdt->base + TWD_WDOG_CONTROL);
  66 +       __raw_writel(0xFFFFFFFFU, wdt->base + TWD_WDOG_LOAD);
  67 +
  68 +       while (get_jiffies_64() < waitjiffies)
  69 +               udelay(10);
  70 +
  71 +       count =  __raw_readl(wdt->base + TWD_WDOG_COUNTER);
  72 +
  73 +       wdt->timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);
  74 +
  75         mpcore_wdt_stop(wdt);
  76         platform_set_drvdata(dev, wdt);
  77         mpcore_wdt_dev = dev;