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| author | Alexander Krutwig <alexander.krutwig@embedded-brains.de> | 2015-04-01 15:33:25 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-05-20 08:40:34 +0200 |
| commit | 75acd9e69f906cbd880a17ee4ca705ad7caa92c0 (patch) | |
| tree | 71529028154cb323286b02392def2e5277eed312 /c/src/lib/libbsp/arm/beagle | |
| parent | timecounter: Use in RTEMS (diff) | |
| download | rtems-75acd9e69f906cbd880a17ee4ca705ad7caa92c0.tar.bz2 | |
bsps: Convert clock drivers to use a timecounter
Update #2271.
Diffstat (limited to 'c/src/lib/libbsp/arm/beagle')
| -rw-r--r-- | c/src/lib/libbsp/arm/beagle/clock.c | 35 |
1 files changed, 10 insertions, 25 deletions
diff --git a/c/src/lib/libbsp/arm/beagle/clock.c b/c/src/lib/libbsp/arm/beagle/clock.c index 66aba1b84b..912d904197 100644 --- a/c/src/lib/libbsp/arm/beagle/clock.c +++ b/c/src/lib/libbsp/arm/beagle/clock.c @@ -15,11 +15,12 @@ */ #include <rtems.h> +#include <rtems/timecounter.h> #include <bsp.h> #include <libcpu/omap_timer.h> -#ifdef ARM_MULTILIB_ARCH_V4 +static struct timecounter beagle_clock_tc; static omap_timer_registers_t regs_v1 = { .TIDR = OMAP3_TIMER_TIDR, @@ -115,8 +116,6 @@ static struct omap_timer *timer = &am335x_timer; #endif -static int done = 0; - #if IS_AM335X #define FRCLOCK_HZ (16*1500000) #endif @@ -181,20 +180,14 @@ omap3_frclock_init(void) /* Start timer, without prescaler */ mmio_set(fr_timer->base + fr_timer->regs->TCLR, OMAP3_TCLR_OVF_TRG | OMAP3_TCLR_AR | OMAP3_TCLR_ST); - done = 1; } -static inline uint32_t -read_frc(void) +static uint32_t +beagle_clock_get_timecount(struct timecounter *tc) { - if (done == 0) { - return 0; - } return mmio_read(fr_timer->base + fr_timer->regs->TCRR); } -static uint32_t last_tick_nanoseconds; - static void beagle_clock_initialize(void) { @@ -262,12 +255,16 @@ beagle_clock_initialize(void) while(mmio_read(AM335X_WDT_BASE+AM335X_WDT_WWPS) != 0) ; #endif + /* Install timecounter */ \ + beagle_clock_tc.tc_get_timecount = beagle_clock_get_timecount; + beagle_clock_tc.tc_counter_mask = 0xffffffff; + beagle_clock_tc.tc_frequency = FRCLOCK_HZ; + beagle_clock_tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER; + rtems_timecounter_install(&beagle_clock_tc); } static void beagle_clock_at_tick(void) { - last_tick_nanoseconds = read_frc(); - mmio_write(timer->base + timer->regs->TISR, OMAP3_TISR_MAT_IT_FLAG | OMAP3_TISR_OVF_IT_FLAG | OMAP3_TISR_TCAR_IT_FLAG); @@ -315,14 +312,6 @@ static void beagle_clock_cleanup(void) mmio_clear(fr_timer->base + fr_timer->regs->TCLR, OMAP3_TCLR_ST); } -static inline uint32_t beagle_clock_nanoseconds_since_last_tick(void) -{ - /* this arithmetic also works if read_frc() wraps around, as long - * as the subtraction wraps around too - */ - return (read_frc() - (uint64_t) last_tick_nanoseconds) * 1000000000 / FRCLOCK_HZ; -} - #define Clock_driver_support_at_tick() beagle_clock_at_tick() #define Clock_driver_support_initialize_hardware() beagle_clock_initialize() #define Clock_driver_support_install_isr(isr, old_isr) \ @@ -332,10 +321,6 @@ static inline uint32_t beagle_clock_nanoseconds_since_last_tick(void) } while (0) #define Clock_driver_support_shutdown_hardware() beagle_clock_cleanup() -#define Clock_driver_nanoseconds_since_last_tick \ - beagle_clock_nanoseconds_since_last_tick /* Include shared source clock driver code */ #include "../../shared/clockdrv_shell.h" - -#endif /* ARM_MULTILIB_ARCH_V4 */ |