diff options
Diffstat (limited to 'c/src/lib/libbsp/nios2/nios2_iss/timer/timer.c')
-rw-r--r-- | c/src/lib/libbsp/nios2/nios2_iss/timer/timer.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/c/src/lib/libbsp/nios2/nios2_iss/timer/timer.c b/c/src/lib/libbsp/nios2/nios2_iss/timer/timer.c deleted file mode 100644 index 18ddb2bf4f..0000000000 --- a/c/src/lib/libbsp/nios2/nios2_iss/timer/timer.c +++ /dev/null @@ -1,151 +0,0 @@ -/* timer.c - * - * This file manages the benchmark timer used by the RTEMS Timing Test - * Suite. Each measured time period is demarcated by calls to - * Timer_initialize() and Read_timer(). Read_timer() usually returns - * the number of microseconds since Timer_initialize() exitted. - * - * NOTE: It is important that the timer start/stop overhead be - * determined when porting or modifying this code. - * - * COPYRIGHT (c) 2005-2006 Kolja Waschk rtemsdev/ixo.de - * Derived from no_cpu/no_bsp/timer/timer.c 1.9, - * COPYRIGHT (c) 1989-1999. - * On-Line Applications Research Corporation (OAR). - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.com/license/LICENSE. - * - * $Id$ - */ - -#define TIMER_WRAPS_AFTER_1MS 0 - -#include <rtems.h> -#include <rtems/score/cpu.h> -#include <bsp.h> - -volatile uint32_t Timer_interrupts; -rtems_boolean Timer_driver_Find_average_overhead; - -#define TIMER_REGS ((altera_avalon_timer_regs*)NIOS2_IO_BASE(TIMER_BASE)) - -void timerisr( void ) -{ - TIMER_REGS->status = 0; - Timer_interrupts++; -} - -void Timer_initialize( void ) -{ - uint32_t old_ie; - - /* Disable timer interrupt, stop timer */ - - TIMER_REGS->control = ALTERA_AVALON_TIMER_CONTROL_STOP_MSK; - - set_vector((nios2_isr_entry *)timerisr, TIMER_VECTOR, 1); - - /* Enable interrupt processing */ - - NIOS2_IENABLE(1 << TIMER_VECTOR); - -#if TIMER_WRAPS_AFTER_1MS - /* Writing to periodl/h resets the counter and eventually - stops it. If the timer hasn't been configured with fixed - period, set it to 1 ms now */ - - TIMER_REGS->period_hi = (TIMER_FREQ/1000)>>16; - TIMER_REGS->period_lo = (TIMER_FREQ/1000)&0xFFFF; -#else - /* Writing to periodl/h resets the counter and eventually - stops it. Set max period */ - - TIMER_REGS->period_hi = 0xFFFF; - TIMER_REGS->period_lo = 0xFFFF; -#endif - - /* For timers that can be stopped, writing to periodl/h - also stopped the timer and we have to manually start it. */ - - TIMER_REGS->control = ALTERA_AVALON_TIMER_CONTROL_ITO_MSK | - ALTERA_AVALON_TIMER_CONTROL_CONT_MSK | - ALTERA_AVALON_TIMER_CONTROL_START_MSK; - - /* This is the most safe place for resetting the overflow - counter - just _after_ we reset the timer. Depending - on the SOPC configuration, the counter may not be - stoppable and it doesn't make sense to assume that - there is any "safe" period before resetting. */ - - Timer_interrupts = 0; -} - -/* - * The following controls the behavior of Read_timer(). - * - * AVG_OVEREHAD is the overhead for starting and stopping the timer. It - * is usually deducted from the number returned. - * - * LEAST_VALID is the lowest number this routine should trust. Numbers - * below this are "noise" and zero is returned. - */ - -#define AVG_OVERHEAD 2 /* It typically takes 2 microseconds */ - /* to start/stop the timer. */ - -#define LEAST_VALID AVG_OVERHEAD /* Don't trust a value lower than this */ - -int Read_timer( void ) -{ - uint32_t timer_wraps; - uint32_t timer_snap; - uint32_t timer_ticks; - uint32_t total; - uint32_t old_ie; - - /* Hold timer */ - TIMER_REGS->control = ALTERA_AVALON_TIMER_CONTROL_STOP_MSK; - - /* Write to request snapshot of timer value */ - TIMER_REGS->snap_lo = 0; - /* Get snapshot */ - timer_snap = ((TIMER_REGS->snap_hi)<<16) | TIMER_REGS->snap_lo; - timer_wraps = Timer_interrupts; - - /* Restart timer */ - TIMER_REGS->control = ALTERA_AVALON_TIMER_CONTROL_START_MSK; - -#if TIMER_WRAPS_AFTER_1MS - timer_ticks = (TIMER_FREQ / 1000) - 1 - timer_snap; - total = timer_wraps * 1000; -#else - timer_ticks = 0xFFFFFFFF - timer_snap; - total = timer_wraps * 0x80000000 / (TIMER_FREQ / 2000000L); -#endif - total += timer_ticks / (TIMER_FREQ / 1000000L); - - if(total < LEAST_VALID) return 0; - - if(Timer_driver_Find_average_overhead != TRUE) total-= AVG_OVERHEAD; - - return total; -} - -/* - * Empty function call used in loops to measure basic cost of looping - * in Timing Test Suite. - */ - -rtems_status_code Empty_function( void ) -{ - return RTEMS_SUCCESSFUL; -} - -void Set_find_average_overhead( - rtems_boolean find_flag -) -{ - Timer_driver_Find_average_overhead = find_flag; -} |