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

   1 // --------------------------------------------------------------------------
   2 INTERFACE [arm && integrator]:
   3
   4 #include "mmio_register_block.h"
   5
   6 EXTENSION class Timer : private Mmio_register_block
   7 {
   8 public:
   9   static unsigned irq() { return 6; }
  10
  11 private:
  12   enum {
  13     TIMER0_BASE = 0x000,
  14     TIMER1_BASE = 0x100,
  15     TIMER2_BASE = 0x200,
  16
  17     TIMER_LOAD   = 0x00,
  18     TIMER_VALUE  = 0x04,
  19     TIMER_CTRL   = 0x08,
  20     TIMER_INTCLR = 0x0c,
  21
  22     TIMER_CTRL_IE       = 1 << 5,
  23     TIMER_CTRL_PERIODIC = 1 << 6,
  24     TIMER_CTRL_ENABLE   = 1 << 7,
  25   };
  26
  27   static Static_object<Timer> _timer;
  28 };
  29
  30 // ----------------------------------------------------------------------
  31 IMPLEMENTATION [arm && integrator]:
  32
  33 #include "config.h"
  34 #include "kip.h"
  35 #include "kmem.h"
  36 #include "mem_layout.h"
  37
  38 Static_object<Timer> Timer::_timer;
  39
  40 PUBLIC
  41 Timer::Timer(Address base) : Mmio_register_block(base)
  42 {
  43   /* Switch all timers off */
  44   write(0, TIMER0_BASE + TIMER_CTRL);
  45   write(0, TIMER1_BASE + TIMER_CTRL);
  46   write(0, TIMER2_BASE + TIMER_CTRL);
  47
  48   unsigned timer_ctrl = TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC;
  49   unsigned timer_reload = 1000000 / Config::Scheduler_granularity;
  50
  51   write(timer_reload, TIMER1_BASE + TIMER_LOAD);
  52   write(timer_reload, TIMER1_BASE + TIMER_VALUE);
  53   write(timer_ctrl | TIMER_CTRL_IE, TIMER1_BASE + TIMER_CTRL);
  54 }
  55
  56 IMPLEMENT
  57 void Timer::init(Cpu_number)
  58 { _timer.construct(Kmem::mmio_remap(Mem_layout::Timer_phys_base)); }
  59
  60 PUBLIC static inline
  61 void
  62 Timer::acknowledge()
  63 {
  64   _timer->write(1, TIMER1_BASE + TIMER_INTCLR);
  65 }
  66
  67 IMPLEMENT inline
  68 void
  69 Timer::update_one_shot(Unsigned64 wakeup)
  70 {
  71   (void)wakeup;
  72 }
  73
  74 IMPLEMENT inline NEEDS["kip.h"]
  75 Unsigned64
  76 Timer::system_clock()
  77 {
  78   if (Config::Scheduler_one_shot)
  79     return 0;
  80   else
  81     return Kip::k()->clock;
  82 }
  83