libpayload: Add timer driver for armada38x

Add timer driver for armada38x

BUG=chrome-os-partner:47462
TEST=emerge-cyclone libpayload
BRANCH=tot

Change-Id: Iefb6d1fcb907edb54d55ba8addfb66329af6c3c7
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: cd467160ecab050a541a445c2afab9e6bc625635
Original-Change-Id: Id42bafdbc34295b6f8afe5610fb3bab0e0e1b6e8
Original-Signed-off-by: Ruilin Hao <rlhao@marvell.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/313343
Original-Commit-Ready: Kan Yan <kyan@google.com>
Original-Tested-by: Kan Yan <kyan@google.com>
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Yuji Sasaki <sasakiy@chromium.org>
Reviewed-on: https://review.coreboot.org/13114
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/payloads/libpayload/drivers/timer/armada38x.c b/payloads/libpayload/drivers/timer/armada38x.c
new file mode 100644
index 0000000000..2a060bb848
--- /dev/null
+++ b/payloads/libpayload/drivers/timer/armada38x.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <libpayload.h>
+#include <libpayload-config.h>
+
+uint64_t timer_hz(void)
+{
+	return CONFIG_LP_ARMADA38X_TIMER_FREQ;
+}
+
+uint64_t timer_raw_value(void)
+{
+	static uint64_t total_ticks = 0;
+	uint64_t overflow = 0;
+	uint32_t current_ticks =
+	    0xffffffff - readl((void *)CONFIG_LP_ARMADA38X_TIMER_REG);
+
+	/* It assumes only one overflow happened since the last call */
+	if (current_ticks <= (uint32_t)total_ticks)
+		overflow = 1ULL << 32;
+	/* The least significant part(32 bits) of total_ticks will always
+	 * become equal to current ticks */
+	total_ticks = (((total_ticks + overflow) >> 32) << 32) + current_ticks;
+	return total_ticks;
+}