1 files changed, 127 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/arm920t/timer.c b/arch/arm/mach-at91/arm920t/timer.c
new file mode 100644
index 0000000000..6aa2994723
--- /dev/null
+++ b/arch/arm/mach-at91/arm920t/timer.c
@@ -0,0 +1,127 @@
+/*
+ * (C) Copyright 2002
+ * Lineo, Inc. <www.lineo.com>
+ * Bernhard Kuhn <bkuhn@lineo.com>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/at91_tc.h>
+#include <asm/arch/at91_pmc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* the number of clocks per CONFIG_SYS_HZ */
+#define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK/CONFIG_SYS_HZ)
+
+int timer_init(void)
+{
+	at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
+	at91_pmc_t *pmc = (at91_pmc_t *) ATMEL_BASE_PMC;
+
+	/* enables TC1.0 clock */
+	writel(1 << ATMEL_ID_TC0, &pmc->pcer);	/* enable clock */
+
+	writel(0, &tc->bcr);
+	writel(AT91_TC_BMR_TC0XC0S_NONE | AT91_TC_BMR_TC1XC1S_NONE |
+		AT91_TC_BMR_TC2XC2S_NONE , &tc->bmr);
+
+	writel(AT91_TC_CCR_CLKDIS, &tc->tc[0].ccr);
+	/* set to MCLK/2 and restart the timer
+	when the value in TC_RC is reached */
+	writel(AT91_TC_CMR_TCCLKS_CLOCK1 | AT91_TC_CMR_CPCTRG, &tc->tc[0].cmr);
+
+	writel(0xFFFFFFFF, &tc->tc[0].idr); /* disable interrupts */
+	writel(TIMER_LOAD_VAL, &tc->tc[0].rc);
+
+	writel(AT91_TC_CCR_SWTRG | AT91_TC_CCR_CLKEN, &tc->tc[0].ccr);
+	gd->arch.lastinc = 0;
+	gd->arch.tbl = 0;
+
+	return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+void __udelay(unsigned long usec)
+{
+	udelay_masked(usec);
+}
+
+ulong get_timer_raw(void)
+{
+	at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
+	u32 now;
+
+	now = readl(&tc->tc[0].cv) & 0x0000ffff;
+
+	if (now >= gd->arch.lastinc) {
+		/* normal mode */
+		gd->arch.tbl += now - gd->arch.lastinc;
+	} else {
+		/* we have an overflow ... */
+		gd->arch.tbl += now + TIMER_LOAD_VAL - gd->arch.lastinc;
+	}
+	gd->arch.lastinc = now;
+
+	return gd->arch.tbl;
+}
+
+ulong get_timer_masked(void)
+{
+	return get_timer_raw()/TIMER_LOAD_VAL;
+}
+
+void udelay_masked(unsigned long usec)
+{
+	u32 tmo;
+	u32 endtime;
+	signed long diff;
+
+	tmo = CONFIG_SYS_HZ_CLOCK / 1000;
+	tmo *= usec;
+	tmo /= 1000;
+
+	endtime = get_timer_raw() + tmo;
+
+	do {
+		u32 now = get_timer_raw();
+		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)
+{
+	return CONFIG_SYS_HZ;
+}