1 files changed, 36 insertions, 0 deletions
diff --git a/chip/g/ite_sync.h b/chip/g/ite_sync.h
new file mode 100644
index 0000000000..c25dc57bc4
--- /dev/null
+++ b/chip/g/ite_sync.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2018 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef __CHIP_G_ITE_SYNC_H
+#define __CHIP_G_ITE_SYNC_H
+
+#include "util.h"
+
+/*
+ * Assembler function to generates ITE EC sync sequence, which requires two
+ * lines generating phase locked 200 KHz and 100 KHz clocks. This is achieved
+ * by directly togging two GPIOs.
+ *
+ * gpio_addr: address of the register to write to drive the GPIOs
+ * both_zero:
+ * one_zero:
+ * zero_one:
+ * both_one: values to write at gpio_addr to set the tow lines to these
+ *          stattes
+ * half_period_ticks: number of interations of the tight loop to last for half
+ *          the period of the higher frequency
+ * total_ticks_required: total ticks required to generate the sequence of the
+ *          necessary duration.
+ */
+void ite_sync(volatile uint16_t *gpio_addr, uint16_t both_zero,
+	      uint16_t one_zero, uint16_t zero_one, uint16_t both_one,
+	      uint32_t half_period_ticks, uint32_t total_ticks_required);
+
+
+/* Generate ITE SYNC sequence on the I2C interface controlling the EC. */
+void generate_ite_sync(void);
+
+#endif