diff options
Diffstat (limited to 'c/src/lib/libbsp/m68k/uC5282/clock/clock.c')
| -rw-r--r-- | c/src/lib/libbsp/m68k/uC5282/clock/clock.c | 48 |
1 files changed, 36 insertions, 12 deletions
diff --git a/c/src/lib/libbsp/m68k/uC5282/clock/clock.c b/c/src/lib/libbsp/m68k/uC5282/clock/clock.c index 8636f96fe0..46e045cae3 100644 --- a/c/src/lib/libbsp/m68k/uC5282/clock/clock.c +++ b/c/src/lib/libbsp/m68k/uC5282/clock/clock.c @@ -12,6 +12,7 @@ */ #include <rtems.h> +#include <rtems/timecounter.h> #include <bsp.h> #include <mcf5282/mcf5282.h> @@ -20,6 +21,32 @@ */ #define CLOCK_VECTOR (64+58) +static rtems_timecounter_simple uC5282_tc; + +static uint32_t uC5282_tc_get(rtems_timecounter_simple *tc) +{ + return MCF5282_PIT3_PCNTR; +} + +static bool uC5282_tc_is_pending(rtems_timecounter_simple *tc) +{ + return (MCF5282_PIT3_PCSR & MCF5282_PIT_PCSR_PIF) != 0; +} + +static uint32_t uC5282_tc_get_timecount(struct timecounter *tc) +{ + return rtems_timecounter_simple_downcounter_get( + tc, + uC5282_tc_get, + uC5282_tc_is_pending + ); +} + +static void uC5282_tc_tick(void) +{ + rtems_timecounter_simple_downcounter_tick(&uC5282_tc, uC5282_tc_get); +} + /* * CPU load counters * Place in static RAM so updates don't hit the SDRAM @@ -31,17 +58,6 @@ #define NSEC_PER_PITC __SRAMBASE.nsec_per_pitc #define FILTER_SHIFT 6 -static uint32_t bsp_clock_nanoseconds_since_last_tick(void) -{ - int i = MCF5282_PIT3_PCNTR; - if (MCF5282_PIT3_PCSR & MCF5282_PIT_PCSR_PIF) - i = MCF5282_PIT3_PCNTR - PITC_PER_TICK; - return (PITC_PER_TICK - i) * NSEC_PER_PITC; -} - -#define Clock_driver_nanoseconds_since_last_tick \ - bsp_clock_nanoseconds_since_last_tick - /* * Periodic interval timer interrupt handler */ @@ -83,7 +99,7 @@ static uint32_t bsp_clock_nanoseconds_since_last_tick(void) */ #define Clock_driver_support_initialize_hardware() \ do { \ - unsigned long long N; \ + unsigned long long N; \ int level; \ int preScaleCode = 0; \ N = bsp_get_CPU_clock_speed(); \ @@ -116,6 +132,12 @@ static uint32_t bsp_clock_nanoseconds_since_last_tick(void) MCF5282_PIT_PCSR_PIE | \ MCF5282_PIT_PCSR_RLD | \ MCF5282_PIT_PCSR_EN; \ + rtems_timecounter_simple_install( \ + &uC5282_tc, \ + bsp_get_CPU_clock_speed() >> (preScaleCode + 1), \ + PITC_PER_TICK, \ + uC5282_tc_get_timecount \ + ); \ } while (0) /* @@ -135,4 +157,6 @@ int bsp_cpu_load_percentage(void) 0; } +#define Clock_driver_timecounter_tick() uC5282_tc_tick() + #include "../../../shared/clockdrv_shell.h" |