zephyr: Remove NPCX dependency from shim/src/espi.c

Allow building the zephyr/shim/src/espi.c for other SOCs by adding
inline functions to abstract away these concepts. Each SOC should
then implement these under the zephyr/shim/chip/<soc> specific
directory.

BRANCH=none
BUG=b:189954415
TEST=zmake testall

Signed-off-by: Yuval Peress <peress@chromium.org>
Change-Id: I776bd65326b509ada3b271177ae727a32d4f96da
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3044400
Reviewed-by: Denis Brockus <dbrockus@chromium.org>

1 files changed, 49 insertions, 0 deletions

diff --git a/zephyr/shim/chip/posix/espi.c b/zephyr/shim/chip/posix/espi.c
new file mode 100644
index 0000000000..cf348744d7
--- /dev/null
+++ b/zephyr/shim/chip/posix/espi.c
@@ -0,0 +1,49 @@
+/* Copyright 2021 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.
+ */
+
+#include <sys/util.h>
+#include "zephyr_espi_shim.h"
+
+#define ACPI_TYPE_POS 0U
+#define ACPI_DATA_POS 8U
+
+/* 8042 event data format */
+#define POSIX_8042_EVT_POS 16U
+#define POSIX_8042_DATA_POS 8U
+#define POSIX_8042_TYPE_POS 0U
+
+/* 8042 event type format */
+#define POSIX_8042_EVT_IBF BIT(0)
+#define POSIX_8042_EVT_OBE BIT(1)
+
+bool is_acpi_command(uint32_t data)
+{
+	return (data >> ACPI_TYPE_POS) & 0x01;
+}
+
+uint32_t get_acpi_value(uint32_t data)
+{
+	return (data >> ACPI_TYPE_POS) & 0xff;
+}
+
+bool is_POSIX_8042_ibf(uint32_t data)
+{
+	return (data >> POSIX_8042_EVT_POS) & POSIX_8042_EVT_IBF;
+}
+
+bool is_POSIX_8042_obe(uint32_t data)
+{
+	return (data >> POSIX_8042_EVT_POS) & POSIX_8042_EVT_OBE;
+}
+
+uint32_t get_POSIX_8042_type(uint32_t data)
+{
+	return (data >> POSIX_8042_TYPE_POS) & 0xFF;
+}
+
+uint32_t get_POSIX_8042_data(uint32_t data)
+{
+	return (data >> POSIX_8042_DATA_POS) & 0xFF;
+}