1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * AMD MP2 1.1 communication interfaces
4  *
5  * Copyright (c) 2022, Advanced Micro Devices, Inc.
6  * All Rights Reserved.
7  *
8  * Author: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
9  */
10 #include <linux/io-64-nonatomic-lo-hi.h>
11 #include <linux/iopoll.h>
12 
13 #include "amd_sfh_interface.h"
14 
amd_sfh_wait_response(struct amd_mp2_dev * mp2,u8 sid,u32 cmd_id)15 static int amd_sfh_wait_response(struct amd_mp2_dev *mp2, u8 sid, u32 cmd_id)
16 {
17 	struct sfh_cmd_response cmd_resp;
18 
19 	/* Get response with status within a max of 1600 ms timeout */
20 	if (!readl_poll_timeout(mp2->mmio + AMD_P2C_MSG(0), cmd_resp.resp,
21 				(cmd_resp.response.response == 0 &&
22 				cmd_resp.response.cmd_id == cmd_id && (sid == 0xff ||
23 				cmd_resp.response.sensor_id == sid)), 500, 1600000))
24 		return cmd_resp.response.response;
25 
26 	return -1;
27 }
28 
amd_start_sensor(struct amd_mp2_dev * privdata,struct amd_mp2_sensor_info info)29 static void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
30 {
31 	struct sfh_cmd_base cmd_base;
32 
33 	cmd_base.ul = 0;
34 	cmd_base.cmd.cmd_id = ENABLE_SENSOR;
35 	cmd_base.cmd.intr_disable = 0;
36 	cmd_base.cmd.sensor_id = info.sensor_idx;
37 
38 	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
39 }
40 
amd_stop_sensor(struct amd_mp2_dev * privdata,u16 sensor_idx)41 static void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx)
42 {
43 	struct sfh_cmd_base cmd_base;
44 
45 	cmd_base.ul = 0;
46 	cmd_base.cmd.cmd_id = DISABLE_SENSOR;
47 	cmd_base.cmd.intr_disable = 0;
48 	cmd_base.cmd.sensor_id = sensor_idx;
49 
50 	writeq(0x0, privdata->mmio + AMD_C2P_MSG(1));
51 	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
52 }
53 
amd_stop_all_sensor(struct amd_mp2_dev * privdata)54 static void amd_stop_all_sensor(struct amd_mp2_dev *privdata)
55 {
56 	struct sfh_cmd_base cmd_base;
57 
58 	cmd_base.ul = 0;
59 	cmd_base.cmd.cmd_id = STOP_ALL_SENSORS;
60 	cmd_base.cmd.intr_disable = 0;
61 
62 	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
63 }
64 
65 static struct amd_mp2_ops amd_sfh_ops = {
66 	.start = amd_start_sensor,
67 	.stop = amd_stop_sensor,
68 	.stop_all = amd_stop_all_sensor,
69 	.response = amd_sfh_wait_response,
70 };
71 
sfh_interface_init(struct amd_mp2_dev * mp2)72 void sfh_interface_init(struct amd_mp2_dev *mp2)
73 {
74 	mp2->mp2_ops = &amd_sfh_ops;
75 }
76