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authorstroese <stroese>2004-12-16 17:56:09 +0000
committerstroese <stroese>2004-12-16 17:56:09 +0000
commitcd42deebd2d27dbefd91b757c852901351992e5a (patch)
tree945317b1f4aa9ee4124689cb9c6b27367ee3847d /lib_m68k/time.c
parente2c22d780e64e385e1c07b0e2203f164ca92f2c9 (diff)
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Coldfire MCF5249 support added
Diffstat (limited to 'lib_m68k/time.c')
-rw-r--r--lib_m68k/time.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/lib_m68k/time.c b/lib_m68k/time.c
index 6f73ba9..fb997b5 100644
--- a/lib_m68k/time.c
+++ b/lib_m68k/time.c
@@ -36,6 +36,11 @@
#include <asm/m5282.h>
#endif
+#ifdef CONFIG_M5249
+#include <asm/m5249.h>
+#include <asm/immap_5249.h>
+#endif
+
static ulong timestamp;
#ifdef CONFIG_M5282
@@ -173,6 +178,87 @@ void wait_ticks (unsigned long ticks)
#endif
+#if defined(CONFIG_M5249)
+/*
+ * We use timer 1 which is running with a period of 1 us
+ */
+void udelay(unsigned long usec)
+{
+ volatile timer_t *timerp = (timer_t *) (CFG_MBAR + MCFTIMER_BASE1);
+ uint start, now, tmp;
+
+ while (usec > 0) {
+ if (usec > 65000)
+ tmp = 65000;
+ else
+ tmp = usec;
+ usec = usec - tmp;
+
+ /* Set up TIMER 1 as timebase clock */
+ timerp->timer_tmr = MCFTIMER_TMR_DISABLE;
+ timerp->timer_tcn = 0;
+ /* set period to 1 us */
+ /* on m5249 the system clock is (cpu_clk / 2) -> divide by 2000000 */
+ timerp->timer_tmr = (((CFG_CLK / 2000000) - 1) << 8) | MCFTIMER_TMR_CLK1 |
+ MCFTIMER_TMR_FREERUN | MCFTIMER_TMR_ENABLE;
+
+ start = now = timerp->timer_tcn;
+ while (now < start + tmp)
+ now = timerp->timer_tcn;
+ }
+}
+
+void mcf_timer_interrupt (void * not_used){
+ volatile timer_t *timerp = (timer_t *) (CFG_MBAR + MCFTIMER_BASE2);
+
+ /* check for timer 2 interrupts */
+ if ((mbar_readLong(MCFSIM_IPR) & 0x00000400) == 0) {
+ return;
+ }
+
+ /* reset timer */
+ timerp->timer_ter = MCFTIMER_TER_CAP | MCFTIMER_TER_REF;
+ timestamp ++;
+}
+
+void timer_init (void) {
+ volatile timer_t *timerp = (timer_t *) (CFG_MBAR + MCFTIMER_BASE2);
+
+ timestamp = 0;
+
+ /* Set up TIMER 2 as clock */
+ timerp->timer_tmr = MCFTIMER_TMR_DISABLE;
+
+ /* initialize and enable timer 2 interrupt */
+ irq_install_handler (31, mcf_timer_interrupt, 0);
+ mbar_writeLong(MCFSIM_IMR, mbar_readLong(MCFSIM_IMR) & ~0x00000400);
+ mbar_writeByte(MCFSIM_TIMER2ICR, MCFSIM_ICR_AUTOVEC | MCFSIM_ICR_LEVEL7 | MCFSIM_ICR_PRI3);
+
+ timerp->timer_tcn = 0;
+ timerp->timer_trr = 1000; /* Interrupt every ms */
+ /* set a period of 1us, set timer mode to restart and enable timer and interrupt */
+ /* on m5249 the system clock is (cpu_clk / 2) -> divide by 2000000 */
+ timerp->timer_tmr = (((CFG_CLK / 2000000) - 1) << 8) | MCFTIMER_TMR_CLK1 |
+ MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENORI | MCFTIMER_TMR_ENABLE;
+}
+
+void reset_timer (void)
+{
+ timestamp = 0;
+}
+
+ulong get_timer (ulong base)
+{
+ return (timestamp - base);
+}
+
+void set_timer (ulong t)
+{
+ timestamp = t;
+}
+#endif
+
+
/*
* This function is derived from PowerPC code (read timebase as long long).
* On M68K it just returns the timer value.