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 | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/c/src/lib/libbsp/m68k/uC5282/clock/clock.c b/c/src/lib/libbsp/m68k/uC5282/clock/clock.c deleted file mode 100644 index 5ec0bc4217..0000000000 --- a/c/src/lib/libbsp/m68k/uC5282/clock/clock.c +++ /dev/null @@ -1,161 +0,0 @@ -/* - * Use the last periodic interval timer (PIT3) as the system clock. - * - * Author: W. Eric Norum <norume@aps.anl.gov> - * - * COPYRIGHT (c) 2005. - * 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.org/license/LICENSE. - */ - -#include <rtems.h> -#include <rtems/timecounter.h> -#include <bsp.h> -#include <mcf5282/mcf5282.h> - -/* - * CPU load counters - * Place in static RAM so updates don't hit the SDRAM - */ -#define IDLE_COUNTER __SRAMBASE.idle_counter -#define FILTERED_IDLE __SRAMBASE.filtered_idle -#define MAX_IDLE_COUNT __SRAMBASE.max_idle_count -#define PITC_PER_TICK __SRAMBASE.pitc_per_tick -#define NSEC_PER_PITC __SRAMBASE.nsec_per_pitc -#define FILTER_SHIFT 6 - -/* - * Use INTC0 base - */ -#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_at_tick(rtems_timecounter_simple *tc) -{ - unsigned idle = IDLE_COUNTER; - IDLE_COUNTER = 0; - if (idle > MAX_IDLE_COUNT) - MAX_IDLE_COUNT = idle; - FILTERED_IDLE = idle + FILTERED_IDLE - (FILTERED_IDLE>>FILTER_SHIFT); - MCF5282_PIT3_PCSR |= MCF5282_PIT_PCSR_PIF; -} - -static void uC5282_tc_tick(void) -{ - rtems_timecounter_simple_downcounter_tick( - &uC5282_tc, - uC5282_tc_get, - uC5282_tc_at_tick - ); -} - -/* - * Attach clock interrupt handler - */ -#define Clock_driver_support_install_isr( _new ) \ - set_vector(_new, CLOCK_VECTOR, 1) - -/* - * Turn off the clock - */ -#define Clock_driver_support_shutdown_hardware() \ - do { \ - MCF5282_PIT3_PCSR &= ~MCF5282_PIT_PCSR_EN; \ - } while(0) - -/* - * Set up the clock hardware - * - * f_pit = f_clk / 2^(preScaleCode+1) / N = 1/(us_per_tick/us_per_s) - * - * N = f_clk / 2^(preScaleCode+1) * us_per_tick / us_per_s - * - * ns_per_pit_clk = ns_per_s / (f_clk / 2^(preScaleCode+1)) - * = ns_per_s * 2^(preScaleCode+1) / f_clk; - */ -#define Clock_driver_support_initialize_hardware() \ - do { \ - unsigned long long N; \ - int level; \ - int preScaleCode = 0; \ - N = bsp_get_CPU_clock_speed(); \ - N *= rtems_configuration_get_microseconds_per_tick(); \ - N /= 2*1000000; /* min_prescale * us_per_s */ \ - while ( N > 0x10000 ) { \ - preScaleCode++; \ - N >>= 1; \ - } \ - PITC_PER_TICK = N; \ - N = 2000000000ULL << preScaleCode; \ - N /= bsp_get_CPU_clock_speed(); \ - NSEC_PER_PITC = N; \ - IDLE_COUNTER = 0; \ - FILTERED_IDLE = 0; \ - MAX_IDLE_COUNT = 0; \ - bsp_allocate_interrupt(PIT3_IRQ_LEVEL, PIT3_IRQ_PRIORITY); \ - MCF5282_INTC0_ICR58 = MCF5282_INTC_ICR_IL(PIT3_IRQ_LEVEL) | \ - MCF5282_INTC_ICR_IP(PIT3_IRQ_PRIORITY); \ - rtems_interrupt_disable( level ); \ - MCF5282_INTC0_IMRH &= ~MCF5282_INTC_IMRH_INT58; \ - MCF5282_PIT3_PCSR &= ~MCF5282_PIT_PCSR_EN; \ - rtems_interrupt_enable( level ); \ - MCF5282_PIT3_PCSR = MCF5282_PIT_PCSR_PRE(preScaleCode) | \ - MCF5282_PIT_PCSR_OVW | \ - MCF5282_PIT_PCSR_PIE | \ - MCF5282_PIT_PCSR_RLD; \ - MCF5282_PIT3_PMR = PITC_PER_TICK - 1; \ - MCF5282_PIT3_PCSR = MCF5282_PIT_PCSR_PRE(preScaleCode) | \ - 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) - -/* - * Provide our own version of the idle task - */ -void * bsp_idle_thread(uint32_t ignored) -{ - /* Atomic increment */ - for(;;) - __asm__ volatile ("addq.l #1,%0"::"m"(IDLE_COUNTER)); -} - -int bsp_cpu_load_percentage(void) -{ - return MAX_IDLE_COUNT ? - (100 - ((100 * (FILTERED_IDLE >> FILTER_SHIFT)) / MAX_IDLE_COUNT)) : - 0; -} - -#define Clock_driver_timecounter_tick() uC5282_tc_tick() - -#include "../../../shared/clockdrv_shell.h" |