kernel/fiasco/src/kern/arm/bsp/kirkwood/timer-arm-kirkwood.cpp

   1 // --------------------------------------------------------------------------
   2 INTERFACE [arm && kirkwood]:
   3
   4 #include "kmem.h"
   5
   6 EXTENSION class Timer
   7 {
   8 public:
   9   static unsigned irq() { return 1; }
  10
  11 private:
  12   enum {
  13     Control_Reg  = Mem_layout::Reset_map_base + 0x20300,
  14     Reload0_Reg  = Mem_layout::Reset_map_base + 0x20310,
  15     Timer0_Reg   = Mem_layout::Reset_map_base + 0x20314,
  16     Reload1_Reg  = Mem_layout::Reset_map_base + 0x20318,
  17     Timer1_Reg   = Mem_layout::Reset_map_base + 0x2031c,
  18
  19     Bridge_cause = Mem_layout::Reset_map_base + 0x20110,
  20     Bridge_mask  = Mem_layout::Reset_map_base + 0x20114,
  21
  22     Timer0_enable = 1 << 0,
  23     Timer0_auto   = 1 << 1,
  24
  25     Timer0_bridge_num = 1 << 1,
  26     Timer1_bridge_num = 1 << 2,
  27
  28     Reload_value = 200000,
  29   };
  30 };
  31
  32 // ----------------------------------------------------------------------
  33 IMPLEMENTATION [arm && kirkwood]:
  34
  35 #include "config.h"
  36 #include "kip.h"
  37 #include "io.h"
  38
  39 IMPLEMENT
  40 void Timer::init(unsigned)
  41 {
  42   // Disable timer
  43   Io::write(0, Control_Reg);
  44
  45   // Set current timer value and reload value
  46   Io::write<Mword>(Reload_value, Timer0_Reg);
  47   Io::write<Mword>(Reload_value, Reload0_Reg);
  48
  49   Io::set<Mword>(Timer0_enable | Timer0_auto, Control_Reg);
  50
  51   Io::set<Unsigned32>(Timer0_bridge_num, Bridge_mask);
  52 }
  53
  54 static inline
  55 Unsigned64
  56 Timer::timer_to_us(Unsigned32 /*cr*/)
  57 { return 0; }
  58
  59 static inline
  60 Unsigned64
  61 Timer::us_to_timer(Unsigned64 us)
  62 { (void)us; return 0; }
  63
  64 PUBLIC static inline NEEDS["io.h"]
  65 void
  66 Timer::acknowledge()
  67 {
  68   Io::clear<Unsigned32>(Timer0_bridge_num, Bridge_cause);
  69 }
  70
  71 IMPLEMENT inline
  72 void
  73 Timer::update_one_shot(Unsigned64 /*wakeup*/)
  74 {
  75 }
  76
  77 IMPLEMENT inline NEEDS["config.h", "kip.h"]
  78 Unsigned64
  79 Timer::system_clock()
  80 {
  81   if (Config::Scheduler_one_shot)
  82     return 0;
  83   return Kip::k()->clock;
  84 }