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authorVitaly Andrianov <vitalya@ti.com>2014-04-04 13:16:49 -0400
committerTom Rini <trini@ti.com>2014-04-17 17:24:38 -0400
commit11bc75572218eeb7f9d9a5f189e98e328a8aeac9 (patch)
treea6e66e398bcec726ed8ec312f7ad222f81e8b450
parentbf411ea9f11a757cb3916f3a2e9753f4e0208672 (diff)
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arm: add support for arch timer
This patch add basic support for the architecture timer found on recent ARMv7 based SoCs. Signed-off-by: Vitaly Andrianov <vitalya@ti.com> Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
-rw-r--r--arch/arm/cpu/armv7/Makefile1
-rw-r--r--arch/arm/cpu/armv7/arch_timer.c58
2 files changed, 59 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile
index 119ebb3..ab869b1 100644
--- a/arch/arm/cpu/armv7/Makefile
+++ b/arch/arm/cpu/armv7/Makefile
@@ -25,6 +25,7 @@ endif
obj-$(CONFIG_KONA) += kona-common/
obj-$(CONFIG_OMAP_COMMON) += omap-common/
+obj-$(CONFIG_SYS_ARCH_TIMER) += arch_timer.o
obj-$(CONFIG_TEGRA) += tegra-common/
ifneq (,$(filter s5pc1xx exynos,$(SOC)))
diff --git a/arch/arm/cpu/armv7/arch_timer.c b/arch/arm/cpu/armv7/arch_timer.c
new file mode 100644
index 0000000..0588e2b
--- /dev/null
+++ b/arch/arm/cpu/armv7/arch_timer.c
@@ -0,0 +1,58 @@
+/*
+ * (C) Copyright 2012-2014
+ * Texas Instruments Incorporated, <www.ti.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <div64.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int timer_init(void)
+{
+ gd->arch.tbl = 0;
+ gd->arch.tbu = 0;
+
+ gd->arch.timer_rate_hz = CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ;
+
+ return 0;
+}
+
+unsigned long long get_ticks(void)
+{
+ ulong nowl, nowu;
+
+ asm volatile("mrrc p15, 0, %0, %1, c14" : "=r" (nowl), "=r" (nowu));
+
+ gd->arch.tbl = nowl;
+ gd->arch.tbu = nowu;
+
+ return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
+}
+
+
+ulong get_timer(ulong base)
+{
+ return lldiv(get_ticks(), gd->arch.timer_rate_hz) - base;
+}
+
+void __udelay(unsigned long usec)
+{
+ unsigned long long endtime;
+
+ endtime = lldiv((unsigned long long)usec * gd->arch.timer_rate_hz,
+ 1000UL);
+
+ endtime += get_ticks();
+
+ while (get_ticks() < endtime)
+ ;
+}
+
+ulong get_tbclk(void)
+{
+ return gd->arch.timer_rate_hz;
+}