xref: /linux/drivers/misc/ibmasm/lowlevel.c (revision 680e6ffa15103ab610c0fc1241d2f98c801b13e2)
1 /*
2  * IBM ASM Service Processor Device Driver
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17  *
18  * Copyright (C) IBM Corporation, 2004
19  *
20  * Author: Max Asböck <amax@us.ibm.com>
21  *
22  */
23 
24 #include "ibmasm.h"
25 #include "lowlevel.h"
26 #include "i2o.h"
27 #include "dot_command.h"
28 #include "remote.h"
29 
30 static struct i2o_header header = I2O_HEADER_TEMPLATE;
31 
32 
33 int ibmasm_send_i2o_message(struct service_processor *sp)
34 {
35 	u32 mfa;
36 	unsigned int command_size;
37 	struct i2o_message *message;
38 	struct command *command = sp->current_command;
39 
40 	mfa = get_mfa_inbound(sp->base_address);
41 	if (!mfa)
42 		return 1;
43 
44 	command_size = get_dot_command_size(command->buffer);
45 	header.message_size = outgoing_message_size(command_size);
46 
47 	message = get_i2o_message(sp->base_address, mfa);
48 
49 	memcpy_toio(&message->header, &header, sizeof(struct i2o_header));
50 	memcpy_toio(&message->data, command->buffer, command_size);
51 
52 	set_mfa_inbound(sp->base_address, mfa);
53 
54 	return 0;
55 }
56 
57 irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id)
58 {
59 	u32	mfa;
60 	struct service_processor *sp = (struct service_processor *)dev_id;
61 	void __iomem *base_address = sp->base_address;
62 	char tsbuf[32];
63 
64 	if (!sp_interrupt_pending(base_address))
65 		return IRQ_NONE;
66 
67 	dbg("respond to interrupt at %s\n", get_timestamp(tsbuf));
68 
69 	if (mouse_interrupt_pending(sp)) {
70 		ibmasm_handle_mouse_interrupt(sp);
71 		clear_mouse_interrupt(sp);
72 	}
73 
74 	mfa = get_mfa_outbound(base_address);
75 	if (valid_mfa(mfa)) {
76 		struct i2o_message *msg = get_i2o_message(base_address, mfa);
77 		ibmasm_receive_message(sp, &msg->data, incoming_data_size(msg));
78 	} else
79 		dbg("didn't get a valid MFA\n");
80 
81 	set_mfa_outbound(base_address, mfa);
82 	dbg("finished interrupt at   %s\n", get_timestamp(tsbuf));
83 
84 	return IRQ_HANDLED;
85 }
86