target/linux/generic/patches-2.6.37/900-bcm47xx_wdt-noprescale.patch

   1 --- a/drivers/watchdog/bcm47xx_wdt.c
   2 +++ b/drivers/watchdog/bcm47xx_wdt.c
   3 @@ -31,6 +31,7 @@
   4
   5  #define WDT_DEFAULT_TIME       30      /* seconds */
   6  #define WDT_MAX_TIME           255     /* seconds */
   7 +#define WDT_SHIFT              15      /* 32.768 KHz on cores with slow WDT clock */
   8
   9  static int wdt_time = WDT_DEFAULT_TIME;
  10  static int nowayout = WATCHDOG_NOWAYOUT;
  11 @@ -50,11 +51,11 @@ static unsigned long bcm47xx_wdt_busy;
  12  static char expect_release;
  13  static struct timer_list wdt_timer;
  14  static atomic_t ticks;
  15 +static int needs_sw_scale;
  16
  17 -static inline void bcm47xx_wdt_hw_start(void)
  18 +static inline void bcm47xx_wdt_hw_start(u32 ticks)
  19  {
  20 -       /* this is 2,5s on 100Mhz clock  and 2s on 133 Mhz */
  21 -       ssb_watchdog_timer_set(&ssb_bcm47xx, 0xfffffff);
  22 +       ssb_watchdog_timer_set(&ssb_bcm47xx, ticks);
  23  }
  24
  25  static inline int bcm47xx_wdt_hw_stop(void)
  26 @@ -65,33 +66,34 @@ static inline int bcm47xx_wdt_hw_stop(vo
  27  static void bcm47xx_timer_tick(unsigned long unused)
  28  {
  29         if (!atomic_dec_and_test(&ticks)) {
  30 -               bcm47xx_wdt_hw_start();
  31 +               /* This is 2,5s on 100Mhz clock and 2s on 133 Mhz */
  32 +               bcm47xx_wdt_hw_start(0xfffffff);
  33                 mod_timer(&wdt_timer, jiffies + HZ);
  34         } else {
  35 -               printk(KERN_CRIT DRV_NAME "Watchdog will fire soon!!!\n");
  36 +               printk(KERN_CRIT DRV_NAME ": Watchdog will fire soon!!!\n");
  37         }
  38  }
  39
  40 -static inline void bcm47xx_wdt_pet(void)
  41 +static void bcm47xx_wdt_pet(void)
  42  {
  43 -       atomic_set(&ticks, wdt_time);
  44 +       if(needs_sw_scale)
  45 +               atomic_set(&ticks, wdt_time);
  46 +       else
  47 +               bcm47xx_wdt_hw_start(wdt_time << WDT_SHIFT);
  48  }
  49
  50  static void bcm47xx_wdt_start(void)
  51  {
  52         bcm47xx_wdt_pet();
  53 -       bcm47xx_timer_tick(0);
  54 -}
  55 -
  56 -static void bcm47xx_wdt_pause(void)
  57 -{
  58 -       del_timer_sync(&wdt_timer);
  59 -       bcm47xx_wdt_hw_stop();
  60 +       if(needs_sw_scale)
  61 +               bcm47xx_timer_tick(0);
  62  }
  63
  64  static void bcm47xx_wdt_stop(void)
  65  {
  66 -       bcm47xx_wdt_pause();
  67 +       if(needs_sw_scale)
  68 +               del_timer_sync(&wdt_timer);
  69 +       bcm47xx_wdt_hw_stop();
  70  }
  71
  72  static int bcm47xx_wdt_settimeout(int new_time)
  73 @@ -243,7 +245,15 @@ static int __init bcm47xx_wdt_init(void)
  74         if (bcm47xx_wdt_hw_stop() < 0)
  75                 return -ENODEV;
  76
  77 -       setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
  78 +       /* FIXME Other cores */
  79 +       if(ssb_bcm47xx.chip_id == 0x5354) {
  80 +               /* Slow WDT clock, no pre-scaling */
  81 +               needs_sw_scale = 0;
  82 +       } else {
  83 +               /* Fast WDT clock, needs software pre-scaling */
  84 +               needs_sw_scale = 1;
  85 +               setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
  86 +       }
  87
  88         if (bcm47xx_wdt_settimeout(wdt_time)) {
  89                 bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME);