xref: /linux/drivers/misc/ibmasm/dot_command.c (revision d99ff463ecf651437e9e4abe68f331dfb6b5bd9d)
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 Asböck <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  */
17 void 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  */
54 int 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 
96 struct 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  */
110 int 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