1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IBM ASM Service Processor Device Driver
4 *
5 * Copyright (C) IBM Corporation, 2004
6 *
7 * Author: Max Asb��ck <amax@us.ibm.com>
8 */
9
10#include "ibmasm.h"
11#include "dot_command.h"
12
13/*
14 * Dispatch an incoming message to the specific handler for the message.
15 * Called from interrupt context.
16 */
17void ibmasm_receive_message(struct service_processor *sp, void *message, int message_size)
18{
19	u32 size;
20	struct dot_command_header *header = (struct dot_command_header *)message;
21
22	if (message_size == 0)
23		return;
24
25	size = get_dot_command_size(message);
26	if (size == 0)
27		return;
28
29	if (size > message_size)
30		size = message_size;
31
32	switch (header->type) {
33	case sp_event:
34		ibmasm_receive_event(sp, message, size);
35		break;
36	case sp_command_response:
37		ibmasm_receive_command_response(sp, message, size);
38		break;
39	case sp_heartbeat:
40		ibmasm_receive_heartbeat(sp, message, size);
41		break;
42	default:
43		dev_err(sp->dev, "Received unknown message from service processor\n");
44	}
45}
46
47
48#define INIT_BUFFER_SIZE 32
49
50
51/*
52 * send the 4.3.5.10 dot command (driver VPD) to the service processor
53 */
54int ibmasm_send_driver_vpd(struct service_processor *sp)
55{
56	struct command *command;
57	struct dot_command_header *header;
58	u8 *vpd_command;
59	u8 *vpd_data;
60	int result = 0;
61
62	command = ibmasm_new_command(sp, INIT_BUFFER_SIZE);
63	if (command == NULL)
64		return -ENOMEM;
65
66	header = (struct dot_command_header *)command->buffer;
67	header->type                = sp_write;
68	header->command_size        = 4;
69	header->data_size           = 16;
70	header->status              = 0;
71	header->reserved            = 0;
72
73	vpd_command = command->buffer + sizeof(struct dot_command_header);
74	vpd_command[0] = 0x4;
75	vpd_command[1] = 0x3;
76	vpd_command[2] = 0x5;
77	vpd_command[3] = 0xa;
78
79	vpd_data = vpd_command + header->command_size;
80	vpd_data[0] = 0;
81	strcat(vpd_data, IBMASM_DRIVER_VPD);
82	vpd_data[10] = 0;
83	vpd_data[15] = 0;
84
85	ibmasm_exec_command(sp, command);
86	ibmasm_wait_for_response(command, IBMASM_CMD_TIMEOUT_NORMAL);
87
88	if (command->status != IBMASM_CMD_COMPLETE)
89		result = -ENODEV;
90
91	command_put(command);
92
93	return result;
94}
95
96struct os_state_command {
97	struct dot_command_header	header;
98	unsigned char			command[3];
99	unsigned char			data;
100};
101
102/*
103 * send the 4.3.6 dot command (os state) to the service processor
104 * During driver init this function is called with os state "up".
105 * This causes the service processor to start sending heartbeats the
106 * driver.
107 * During driver exit the function is called with os state "down",
108 * causing the service processor to stop the heartbeats.
109 */
110int ibmasm_send_os_state(struct service_processor *sp, int os_state)
111{
112	struct command *cmd;
113	struct os_state_command *os_state_cmd;
114	int result = 0;
115
116	cmd = ibmasm_new_command(sp, sizeof(struct os_state_command));
117	if (cmd == NULL)
118		return -ENOMEM;
119
120	os_state_cmd = (struct os_state_command *)cmd->buffer;
121	os_state_cmd->header.type		= sp_write;
122	os_state_cmd->header.command_size	= 3;
123	os_state_cmd->header.data_size		= 1;
124	os_state_cmd->header.status		= 0;
125	os_state_cmd->command[0]		= 4;
126	os_state_cmd->command[1]		= 3;
127	os_state_cmd->command[2]		= 6;
128	os_state_cmd->data			= os_state;
129
130	ibmasm_exec_command(sp, cmd);
131	ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);
132
133	if (cmd->status != IBMASM_CMD_COMPLETE)
134		result = -ENODEV;
135
136	command_put(cmd);
137	return result;
138}
139