diff options
Diffstat (limited to 'cpu/arm926ejs/interrupts.c')
-rw-r--r-- | cpu/arm926ejs/interrupts.c | 148 |
1 files changed, 3 insertions, 145 deletions
diff --git a/cpu/arm926ejs/interrupts.c b/cpu/arm926ejs/interrupts.c index 0457bff..9cac969 100644 --- a/cpu/arm926ejs/interrupts.c +++ b/cpu/arm926ejs/interrupts.c @@ -39,16 +39,6 @@ #include <arm926ejs.h> #include <asm/proc-armv/ptrace.h> -#define TIMER_LOAD_VAL 0xffffffff - -/* macro to read the 32 bit timer */ -#ifdef CONFIG_OMAP -#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+8)) -#endif -#ifdef CONFIG_VERSATILE -#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+4)) -#endif - #ifdef CONFIG_USE_IRQ /* enable IRQ interrupts */ void enable_interrupts (void) @@ -188,146 +178,14 @@ void do_irq (struct pt_regs *pt_regs) #else -static ulong timestamp; -static ulong lastdec; - /* nothing really to do with interrupts, just starts up a counter. */ int interrupt_init (void) { -#ifdef CONFIG_OMAP - int32_t val; - - /* Start the decrementer ticking down from 0xffffffff */ - *((int32_t *) (CFG_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL; - val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CFG_PVT << MPUTIM_PTV_BIT); - *((int32_t *) (CFG_TIMERBASE + CNTL_TIMER)) = val; -#endif /* CONFIG_OMAP */ - -#ifdef CONFIG_VERSATILE - *(volatile ulong *)(CFG_TIMERBASE + 0) = CFG_TIMER_RELOAD; /* TimerLoad */ - *(volatile ulong *)(CFG_TIMERBASE + 4) = CFG_TIMER_RELOAD; /* TimerValue */ - *(volatile ulong *)(CFG_TIMERBASE + 8) = 0x8C; -#endif /* CONFIG_VERSATILE */ - - /* init the timestamp and lastdec value */ - reset_timer_masked(); - - return (0); -} - -/* - * timer without interrupts - */ - -void reset_timer (void) -{ - reset_timer_masked (); -} + extern void timer_init(void); -ulong get_timer (ulong base) -{ - return get_timer_masked () - base; -} + timer_init(); -void set_timer (ulong t) -{ - timestamp = t; -} - -/* delay x useconds AND perserve advance timstamp value */ -void udelay (unsigned long usec) -{ - ulong tmo, tmp; - - if(usec >= 1000){ /* if "big" number, spread normalization to seconds */ - tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ - tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */ - tmo /= 1000; /* finish normalize. */ - }else{ /* else small number, don't kill it prior to HZ multiply */ - tmo = usec * CFG_HZ; - tmo /= (1000*1000); - } - - tmp = get_timer (0); /* get current timestamp */ - if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */ - reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */ - else - tmo += tmp; /* else, set advancing stamp wake up time */ - - while (get_timer_masked () < tmo)/* loop till event */ - /*NOP*/; -} - -void reset_timer_masked (void) -{ - /* reset time */ - lastdec = READ_TIMER; /* capure current decrementer value time */ - timestamp = 0; /* start "advancing" time stamp from 0 */ -} - -ulong get_timer_masked (void) -{ - ulong now = READ_TIMER; /* current tick value */ - - if (lastdec >= now) { /* normal mode (non roll) */ - /* normal mode */ - timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */ - } else { /* we have overflow of the count down timer */ - /* nts = ts + ld + (TLV - now) - * ts=old stamp, ld=time that passed before passing through -1 - * (TLV-now) amount of time after passing though -1 - * nts = new "advancing time stamp"...it could also roll and cause problems. - */ - timestamp += lastdec + TIMER_LOAD_VAL - now; - } - lastdec = now; - - return timestamp; -} - -/* waits specified delay value and resets timestamp */ -void udelay_masked (unsigned long usec) -{ - ulong tmo; - ulong endtime; - signed long diff; - - if (usec >= 1000) { /* if "big" number, spread normalization to seconds */ - tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ - tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */ - tmo /= 1000; /* finish normalize. */ - } else { /* else small number, don't kill it prior to HZ multiply */ - tmo = usec * CFG_HZ; - tmo /= (1000*1000); - } - - endtime = get_timer_masked () + tmo; - - do { - ulong now = get_timer_masked (); - diff = endtime - now; - } while (diff >= 0); -} - -/* - * This function is derived from PowerPC code (read timebase as long long). - * On ARM it just returns the timer value. - */ -unsigned long long get_ticks(void) -{ - return get_timer(0); -} - -/* - * This function is derived from PowerPC code (timebase clock frequency). - * On ARM it returns the number of timer ticks per second. - */ -ulong get_tbclk (void) -{ - ulong tbclk; - - tbclk = CFG_HZ; - return tbclk; + return 0; } #endif /* CONFIG_INTEGRATOR */ |