1 files changed, 75 insertions, 0 deletions
diff --git a/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_interface.c b/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_interface.c
new file mode 100644
index 000000000000..c6df959ec725
--- /dev/null
+++ b/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_interface.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AMD MP2 1.1 communication interfaces
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
+ */
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/iopoll.h>
+
+#include "amd_sfh_interface.h"
+
+static int amd_sfh_wait_response(struct amd_mp2_dev *mp2, u8 sid, u32 cmd_id)
+{
+	struct sfh_cmd_response cmd_resp;
+
+	/* Get response with status within a max of 1600 ms timeout */
+	if (!readl_poll_timeout(mp2->mmio + AMD_P2C_MSG(0), cmd_resp.resp,
+				(cmd_resp.response.response == 0 &&
+				cmd_resp.response.cmd_id == cmd_id && (sid == 0xff ||
+				cmd_resp.response.sensor_id == sid)), 500, 1600000))
+		return cmd_resp.response.response;
+
+	return -1;
+}
+
+static void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
+{
+	struct sfh_cmd_base cmd_base;
+
+	cmd_base.ul = 0;
+	cmd_base.cmd.cmd_id = ENABLE_SENSOR;
+	cmd_base.cmd.intr_disable = 0;
+	cmd_base.cmd.sensor_id = info.sensor_idx;
+
+	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
+}
+
+static void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx)
+{
+	struct sfh_cmd_base cmd_base;
+
+	cmd_base.ul = 0;
+	cmd_base.cmd.cmd_id = DISABLE_SENSOR;
+	cmd_base.cmd.intr_disable = 0;
+	cmd_base.cmd.sensor_id = sensor_idx;
+
+	writeq(0x0, privdata->mmio + AMD_C2P_MSG(1));
+	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
+}
+
+static void amd_stop_all_sensor(struct amd_mp2_dev *privdata)
+{
+	struct sfh_cmd_base cmd_base;
+
+	cmd_base.ul = 0;
+	cmd_base.cmd.cmd_id = STOP_ALL_SENSORS;
+	cmd_base.cmd.intr_disable = 0;
+
+	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
+}
+
+static struct amd_mp2_ops amd_sfh_ops = {
+	.start = amd_start_sensor,
+	.stop = amd_stop_sensor,
+	.stop_all = amd_stop_all_sensor,
+	.response = amd_sfh_wait_response,
+};
+
+void sfh_interface_init(struct amd_mp2_dev *mp2)
+{
+	mp2->mp2_ops = &amd_sfh_ops;
+}