From cd42deebd2d27dbefd91b757c852901351992e5a Mon Sep 17 00:00:00 2001
From: stroese <stroese>
Date: Thu, 16 Dec 2004 17:56:09 +0000
Subject: Coldfire MCF5249 support added

---
 lib_m68k/time.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)

(limited to 'lib_m68k/time.c')

diff --git a/lib_m68k/time.c b/lib_m68k/time.c
index 6f73ba9c2..fb997b5b4 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.
-- 
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