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Diffstat (limited to 'arch/arm/cpu/armv7/vf610/timer.c')
-rw-r--r--arch/arm/cpu/armv7/vf610/timer.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/vf610/timer.c b/arch/arm/cpu/armv7/vf610/timer.c
new file mode 100644
index 0000000..f8fbed7
--- /dev/null
+++ b/arch/arm/cpu/armv7/vf610/timer.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <div64.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/clock.h>
+
+static struct pit_reg *cur_pit = (struct pit_reg *)PIT_BASE_ADDR;
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define TIMER_LOAD_VAL 0xffffffff
+
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+ tick *= CONFIG_SYS_HZ;
+ do_div(tick, mxc_get_clock(MXC_IPG_CLK));
+
+ return tick;
+}
+
+static inline unsigned long long us_to_tick(unsigned long long usec)
+{
+ usec = usec * mxc_get_clock(MXC_IPG_CLK) + 999999;
+ do_div(usec, 1000000);
+
+ return usec;
+}
+
+int timer_init(void)
+{
+ __raw_writel(0, &cur_pit->mcr);
+
+ __raw_writel(TIMER_LOAD_VAL, &cur_pit->ldval1);
+ __raw_writel(0, &cur_pit->tctrl1);
+ __raw_writel(1, &cur_pit->tctrl1);
+
+ gd->arch.tbl = 0;
+ gd->arch.tbu = 0;
+
+ return 0;
+}
+
+unsigned long long get_ticks(void)
+{
+ ulong now = TIMER_LOAD_VAL - __raw_readl(&cur_pit->cval1);
+
+ /* increment tbu if tbl has rolled over */
+ if (now < gd->arch.tbl)
+ gd->arch.tbu++;
+ gd->arch.tbl = now;
+
+ return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
+}
+
+ulong get_timer_masked(void)
+{
+ return tick_to_time(get_ticks());
+}
+
+ulong get_timer(ulong base)
+{
+ return get_timer_masked() - base;
+}
+
+/* delay x useconds AND preserve advance timstamp value */
+void __udelay(unsigned long usec)
+{
+ unsigned long long start;
+ ulong tmo;
+
+ start = get_ticks(); /* get current timestamp */
+ tmo = us_to_tick(usec); /* convert usecs to ticks */
+ while ((get_ticks() - start) < tmo)
+ ; /* loop till time has passed */
+}
+
+/*
+ * 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 mxc_get_clock(MXC_IPG_CLK);
+}