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 "lowlevel.h"
12 #include "i2o.h"
13 #include "dot_command.h"
14 #include "remote.h"
15 
16 static struct i2o_header header = I2O_HEADER_TEMPLATE;
17 
18 
ibmasm_send_i2o_message(struct service_processor * sp)19 int ibmasm_send_i2o_message(struct service_processor *sp)
20 {
21 	u32 mfa;
22 	unsigned int command_size;
23 	struct i2o_message *message;
24 	struct command *command = sp->current_command;
25 
26 	mfa = get_mfa_inbound(sp->base_address);
27 	if (!mfa)
28 		return 1;
29 
30 	command_size = get_dot_command_size(command->buffer);
31 	header.message_size = outgoing_message_size(command_size);
32 
33 	message = get_i2o_message(sp->base_address, mfa);
34 
35 	memcpy_toio(&message->header, &header, sizeof(struct i2o_header));
36 	memcpy_toio(&message->data, command->buffer, command_size);
37 
38 	set_mfa_inbound(sp->base_address, mfa);
39 
40 	return 0;
41 }
42 
ibmasm_interrupt_handler(int irq,void * dev_id)43 irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id)
44 {
45 	u32	mfa;
46 	struct service_processor *sp = (struct service_processor *)dev_id;
47 	void __iomem *base_address = sp->base_address;
48 	char tsbuf[32];
49 
50 	if (!sp_interrupt_pending(base_address))
51 		return IRQ_NONE;
52 
53 	dbg("respond to interrupt at %s\n", get_timestamp(tsbuf));
54 
55 	if (mouse_interrupt_pending(sp)) {
56 		ibmasm_handle_mouse_interrupt(sp);
57 		clear_mouse_interrupt(sp);
58 	}
59 
60 	mfa = get_mfa_outbound(base_address);
61 	if (valid_mfa(mfa)) {
62 		struct i2o_message *msg = get_i2o_message(base_address, mfa);
63 		ibmasm_receive_message(sp, &msg->data, incoming_data_size(msg));
64 	} else
65 		dbg("didn't get a valid MFA\n");
66 
67 	set_mfa_outbound(base_address, mfa);
68 	dbg("finished interrupt at   %s\n", get_timestamp(tsbuf));
69 
70 	return IRQ_HANDLED;
71 }
72