diff options
Diffstat (limited to 'cpu/arm920t/s3c24x0/timer.c')
| -rw-r--r-- | cpu/arm920t/s3c24x0/timer.c | 110 |
1 files changed, 61 insertions, 49 deletions
diff --git a/cpu/arm920t/s3c24x0/timer.c b/cpu/arm920t/s3c24x0/timer.c index c8c7cdb..20cedd4 100644 --- a/cpu/arm920t/s3c24x0/timer.c +++ b/cpu/arm920t/s3c24x0/timer.c @@ -30,7 +30,11 @@ */ #include <common.h> -#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) +#if defined(CONFIG_S3C2400) || \ + defined(CONFIG_S3C2410) || \ + defined(CONFIG_TRAB) + +#include <asm/io.h> #if defined(CONFIG_S3C2400) #include <s3c2400.h> @@ -39,40 +43,45 @@ #endif int timer_load_val = 0; +static ulong timer_clk; /* macro to read the 16 bit timer */ static inline ulong READ_TIMER(void) { - S3C24X0_TIMERS * const timers = S3C24X0_GetBase_TIMERS(); + struct s3c24x0_timers *timers = s3c24x0_get_base_timers(); - return (timers->TCNTO4 & 0xffff); + return readl(&timers->TCNTO4) & 0xffff; } static ulong timestamp; static ulong lastdec; -int timer_init (void) +int timer_init(void) { - S3C24X0_TIMERS * const timers = S3C24X0_GetBase_TIMERS(); + struct s3c24x0_timers *timers = s3c24x0_get_base_timers(); + ulong tmr; /* use PWM Timer 4 because it has no output */ /* prescaler for Timer 4 is 16 */ - timers->TCFG0 = 0x0f00; - if (timer_load_val == 0) - { + writel(0x0f00, &timers->TCFG0); + if (timer_load_val == 0) { /* * for 10 ms clock period @ PCLK with 4 bit divider = 1/2 * (default) and prescaler = 16. Should be 10390 * @33.25MHz and 15625 @ 50 MHz */ - timer_load_val = get_PCLK()/(2 * 16 * 100); + timer_load_val = get_PCLK() / (2 * 16 * 100); + timer_clk = get_PCLK() / (2 * 16); } /* load value for 10 ms timeout */ - lastdec = timers->TCNTB4 = timer_load_val; + lastdec = timer_load_val; + writel(timer_load_val, &timers->TCNTB4); /* auto load, manual update of Timer 4 */ - timers->TCON = (timers->TCON & ~0x0700000) | 0x600000; + tmr = (readl(&timers->TCON) & ~0x0700000) | 0x0600000; + writel(tmr, &timers->TCON); /* auto load, start Timer 4 */ - timers->TCON = (timers->TCON & ~0x0700000) | 0x500000; + tmr = (tmr & ~0x0700000) | 0x0500000; + writel(tmr, &timers->TCON); timestamp = 0; return (0); @@ -82,58 +91,49 @@ int timer_init (void) * timer without interrupts */ -void reset_timer (void) +void reset_timer(void) { - reset_timer_masked (); + reset_timer_masked(); } -ulong get_timer (ulong base) +ulong get_timer(ulong base) { - return get_timer_masked () - base; + return get_timer_masked() - base; } -void set_timer (ulong t) +void set_timer(ulong t) { timestamp = t; } -void udelay (unsigned long usec) +void udelay(unsigned long usec) { ulong tmo; - ulong start = get_timer(0); + ulong start = get_ticks(); tmo = usec / 1000; tmo *= (timer_load_val * 100); tmo /= 1000; - while ((ulong)(get_timer_masked () - start) < tmo) + while ((ulong) (get_ticks() - start) < tmo) /*NOP*/; } -void reset_timer_masked (void) +void reset_timer_masked(void) { /* reset time */ lastdec = READ_TIMER(); timestamp = 0; } -ulong get_timer_masked (void) +ulong get_timer_masked(void) { - ulong now = READ_TIMER(); + ulong tmr = get_ticks(); - if (lastdec >= now) { - /* normal mode */ - timestamp += lastdec - now; - } else { - /* we have an overflow ... */ - timestamp += lastdec + timer_load_val - now; - } - lastdec = now; - - return timestamp; + return tmr / (timer_clk / CONFIG_SYS_HZ); } -void udelay_masked (unsigned long usec) +void udelay_masked(unsigned long usec) { ulong tmo; ulong endtime; @@ -145,13 +145,13 @@ void udelay_masked (unsigned long usec) tmo /= 1000; } else { tmo = usec * (timer_load_val * 100); - tmo /= (1000*1000); + tmo /= (1000 * 1000); } - endtime = get_timer_masked () + tmo; + endtime = get_ticks() + tmo; do { - ulong now = get_timer_masked (); + ulong now = get_ticks(); diff = endtime - now; } while (diff >= 0); } @@ -162,14 +162,25 @@ void udelay_masked (unsigned long usec) */ unsigned long long get_ticks(void) { - return get_timer(0); + ulong now = READ_TIMER(); + + if (lastdec >= now) { + /* normal mode */ + timestamp += lastdec - now; + } else { + /* we have an overflow ... */ + timestamp += lastdec + timer_load_val - now; + } + lastdec = now; + + return timestamp; } /* * 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 get_tbclk(void) { ulong tbclk; @@ -189,30 +200,31 @@ ulong get_tbclk (void) /* * reset the cpu by setting up the watchdog timer and let him time out */ -void reset_cpu (ulong ignored) +void reset_cpu(ulong ignored) { - volatile S3C24X0_WATCHDOG * watchdog; + struct s3c24x0_watchdog *watchdog; #ifdef CONFIG_TRAB - extern void disable_vfd (void); - disable_vfd(); #endif - watchdog = S3C24X0_GetBase_WATCHDOG(); + watchdog = s3c24x0_get_base_watchdog(); /* Disable watchdog */ - watchdog->WTCON = 0x0000; + writel(0x0000, &watchdog->WTCON); /* Initialize watchdog timer count register */ - watchdog->WTCNT = 0x0001; + writel(0x0001, &watchdog->WTCNT); /* Enable watchdog timer; assert reset at timer timeout */ - watchdog->WTCON = 0x0021; + writel(0x0021, &watchdog->WTCON); - while(1); /* loop forever and wait for reset to happen */ + while (1) + /* loop forever and wait for reset to happen */; /*NOTREACHED*/ } -#endif /* defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) */ +#endif /* defined(CONFIG_S3C2400) || + defined (CONFIG_S3C2410) || + defined (CONFIG_TRAB) */ |