target/linux/brcm47xx/patches-3.6/900-bcm47xx_wdt-noprescale.patch

   1 --- a/drivers/watchdog/bcm47xx_wdt.c
   2 +++ b/drivers/watchdog/bcm47xx_wdt.c
   3 @@ -33,6 +33,7 @@
   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 bool nowayout = WATCHDOG_NOWAYOUT;
  11 @@ -52,20 +53,20 @@ 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         switch (bcm47xx_bus_type) {
  22  #ifdef CONFIG_BCM47XX_SSB
  23         case BCM47XX_BUS_TYPE_SSB:
  24 -               ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0xfffffff);
  25 +               ssb_watchdog_timer_set(&bcm47xx_bus.ssb, ticks);
  26                 break;
  27  #endif
  28  #ifdef CONFIG_BCM47XX_BCMA
  29         case BCM47XX_BUS_TYPE_BCMA:
  30                 bcma_chipco_watchdog_timer_set(&bcm47xx_bus.bcma.bus.drv_cc,
  31 -                                              0xfffffff);
  32 +                                              ticks);
  33                 break;
  34  #endif
  35         }
  36 @@ -90,33 +91,34 @@ static inline int bcm47xx_wdt_hw_stop(vo
  37  static void bcm47xx_timer_tick(unsigned long unused)
  38  {
  39         if (!atomic_dec_and_test(&ticks)) {
  40 -               bcm47xx_wdt_hw_start();
  41 +               /* This is 2,5s on 100Mhz clock and 2s on 133 Mhz */
  42 +               bcm47xx_wdt_hw_start(0xfffffff);
  43                 mod_timer(&wdt_timer, jiffies + HZ);
  44         } else {
  45                 pr_crit("Watchdog will fire soon!!!\n");
  46         }
  47  }
  48
  49 -static inline void bcm47xx_wdt_pet(void)
  50 +static void bcm47xx_wdt_pet(void)
  51  {
  52 -       atomic_set(&ticks, wdt_time);
  53 +       if(needs_sw_scale)
  54 +               atomic_set(&ticks, wdt_time);
  55 +       else
  56 +               bcm47xx_wdt_hw_start(wdt_time << WDT_SHIFT);
  57  }
  58
  59  static void bcm47xx_wdt_start(void)
  60  {
  61         bcm47xx_wdt_pet();
  62 -       bcm47xx_timer_tick(0);
  63 -}
  64 -
  65 -static void bcm47xx_wdt_pause(void)
  66 -{
  67 -       del_timer_sync(&wdt_timer);
  68 -       bcm47xx_wdt_hw_stop();
  69 +       if(needs_sw_scale)
  70 +               bcm47xx_timer_tick(0);
  71  }
  72
  73  static void bcm47xx_wdt_stop(void)
  74  {
  75 -       bcm47xx_wdt_pause();
  76 +       if(needs_sw_scale)
  77 +               del_timer_sync(&wdt_timer);
  78 +       bcm47xx_wdt_hw_stop();
  79  }
  80
  81  static int bcm47xx_wdt_settimeout(int new_time)
  82 @@ -267,7 +269,20 @@ static int __init bcm47xx_wdt_init(void)
  83         if (bcm47xx_wdt_hw_stop() < 0)
  84                 return -ENODEV;
  85
  86 -       setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
  87 +       /* FIXME Other cores */
  88 +#ifdef BCM47XX_BUS_TYPE_BCMA
  89 +       if(bcm47xx_bus_type == BCM47XX_BUS_TYPE_BCMA &&
  90 +          bcm47xx_bus.ssb.chip_id == 0x5354) {
  91 +               /* Slow WDT clock, no pre-scaling */
  92 +               needs_sw_scale = 0;
  93 +       } else {
  94 +#endif
  95 +               /* Fast WDT clock, needs software pre-scaling */
  96 +               needs_sw_scale = 1;
  97 +               setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
  98 +#ifdef BCM47XX_BUS_TYPE_BCMA
  99 +       }
 100 +#endif
 101
 102         if (bcm47xx_wdt_settimeout(wdt_time)) {
 103                 bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME);