aboutsummaryrefslogtreecommitdiff
path: root/drivers/isdn/sc/message.c
blob: 9679a1902b325f150b8ef4d0854cb03a4f78993c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
/* $Id: message.c,v 1.5.8.2 2001/09/23 22:24:59 kai Exp $
 *
 * functions for sending and receiving control messages
 *
 * Copyright (C) 1996  SpellCaster Telecommunications Inc.
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * For more information, please contact gpl-info@spellcast.com or write:
 *
 *     SpellCaster Telecommunications Inc.
 *     5621 Finch Avenue East, Unit #3
 *     Scarborough, Ontario  Canada
 *     M1B 2T9
 *     +1 (416) 297-8565
 *     +1 (416) 297-6433 Facsimile
 */
#include <linux/sched.h>
#include "includes.h"
#include "hardware.h"
#include "message.h"
#include "card.h"

/*
 * receive a message from the board
 */
int receivemessage(int card, RspMessage *rspmsg)
{
	DualPortMemory *dpm;
	unsigned long flags;

	if (!IS_VALID_CARD(card)) {
		pr_debug("Invalid param: %d is not a valid card id\n", card);
		return -EINVAL;
	}

	pr_debug("%s: Entered receivemessage\n",
		 sc_adapter[card]->devicename);

	/*
	 * See if there are messages waiting
	 */
	if (inb(sc_adapter[card]->ioport[FIFO_STATUS]) & RF_HAS_DATA) {
		/*
		 * Map in the DPM to the base page and copy the message
		 */
		spin_lock_irqsave(&sc_adapter[card]->lock, flags);
		outb((sc_adapter[card]->shmem_magic >> 14) | 0x80,
		     sc_adapter[card]->ioport[sc_adapter[card]->shmem_pgport]);
		dpm = (DualPortMemory *) sc_adapter[card]->rambase;
		memcpy_fromio(rspmsg, &(dpm->rsp_queue[dpm->rsp_tail]),
			      MSG_LEN);
		dpm->rsp_tail = (dpm->rsp_tail + 1) % MAX_MESSAGES;
		inb(sc_adapter[card]->ioport[FIFO_READ]);
		spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
		/*
		 * Tell the board that the message is received
		 */
		pr_debug("%s: Received Message seq:%d pid:%d time:%d cmd:%d "
			 "cnt:%d (type,class,code):(%d,%d,%d) "
			 "link:%d stat:0x%x\n",
			 sc_adapter[card]->devicename,
			 rspmsg->sequence_no,
			 rspmsg->process_id,
			 rspmsg->time_stamp,
			 rspmsg->cmd_sequence_no,
			 rspmsg->msg_byte_cnt,
			 rspmsg->type,
			 rspmsg->class,
			 rspmsg->code,
			 rspmsg->phy_link_no,
			 rspmsg->rsp_status);

		return 0;
	}
	return -ENOMSG;
}

/*
 * send a message to the board
 */
int sendmessage(int card,
		unsigned int procid,
		unsigned int type,
		unsigned int class,
		unsigned int code,
		unsigned int link,
		unsigned int data_len,
		unsigned int *data)
{
	DualPortMemory *dpm;
	ReqMessage sndmsg;
	unsigned long flags;

	if (!IS_VALID_CARD(card)) {
		pr_debug("Invalid param: %d is not a valid card id\n", card);
		return -EINVAL;
	}

	/*
	 * Make sure we only send CEPID messages when the engine is up
	 * and CMPID messages when it is down
	 */
	if (sc_adapter[card]->EngineUp && procid == CMPID) {
		pr_debug("%s: Attempt to send CM message with engine up\n",
			 sc_adapter[card]->devicename);
		return -ESRCH;
	}

	if (!sc_adapter[card]->EngineUp && procid == CEPID) {
		pr_debug("%s: Attempt to send CE message with engine down\n",
			 sc_adapter[card]->devicename);
		return -ESRCH;
	}

	memset(&sndmsg, 0, MSG_LEN);
	sndmsg.msg_byte_cnt = 4;
	sndmsg.type = type;
	sndmsg.class = class;
	sndmsg.code = code;
	sndmsg.phy_link_no = link;

	if (data_len > 0) {
		if (data_len > MSG_DATA_LEN)
			data_len = MSG_DATA_LEN;
		memcpy(&(sndmsg.msg_data), data, data_len);
		sndmsg.msg_byte_cnt = data_len + 8;
	}

	sndmsg.process_id = procid;
	sndmsg.sequence_no = sc_adapter[card]->seq_no++ % 256;

	/*
	 * wait for an empty slot in the queue
	 */
	while (!(inb(sc_adapter[card]->ioport[FIFO_STATUS]) & WF_NOT_FULL))
		udelay(1);

	/*
	 * Disable interrupts and map in shared memory
	 */
	spin_lock_irqsave(&sc_adapter[card]->lock, flags);
	outb((sc_adapter[card]->shmem_magic >> 14) | 0x80,
	     sc_adapter[card]->ioport[sc_adapter[card]->shmem_pgport]);
	dpm = (DualPortMemory *) sc_adapter[card]->rambase;	/* Fix me */
	memcpy_toio(&(dpm->req_queue[dpm->req_head]), &sndmsg, MSG_LEN);
	dpm->req_head = (dpm->req_head + 1) % MAX_MESSAGES;
	outb(sndmsg.sequence_no, sc_adapter[card]->ioport[FIFO_WRITE]);
	spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);

	pr_debug("%s: Sent Message seq:%d pid:%d time:%d "
		 "cnt:%d (type,class,code):(%d,%d,%d) "
		 "link:%d\n ",
		 sc_adapter[card]->devicename,
		 sndmsg.sequence_no,
		 sndmsg.process_id,
		 sndmsg.time_stamp,
		 sndmsg.msg_byte_cnt,
		 sndmsg.type,
		 sndmsg.class,
		 sndmsg.code,
		 sndmsg.phy_link_no);

	return 0;
}

int send_and_receive(int card,
		     unsigned int procid,
		     unsigned char type,
		     unsigned char class,
		     unsigned char code,
		     unsigned char link,
		     unsigned char data_len,
		     unsigned char *data,
		     RspMessage *mesgdata,
		     int timeout)
{
	int retval;
	int tries;

	if (!IS_VALID_CARD(card)) {
		pr_debug("Invalid param: %d is not a valid card id\n", card);
		return -EINVAL;
	}

	sc_adapter[card]->want_async_messages = 1;
	retval = sendmessage(card, procid, type, class, code, link,
			     data_len, (unsigned int *) data);

	if (retval) {
		pr_debug("%s: SendMessage failed in SAR\n",
			 sc_adapter[card]->devicename);
		sc_adapter[card]->want_async_messages = 0;
		return -EIO;
	}

	tries = 0;
	/* wait for the response */
	while (tries < timeout) {
		schedule_timeout_interruptible(1);

		pr_debug("SAR waiting..\n");

		/*
		 * See if we got our message back
		 */
		if ((sc_adapter[card]->async_msg.type == type) &&
		    (sc_adapter[card]->async_msg.class == class) &&
		    (sc_adapter[card]->async_msg.code == code) &&
		    (sc_adapter[card]->async_msg.phy_link_no == link)) {

			/*
			 * Got it!
			 */
			pr_debug("%s: Got ASYNC message\n",
				 sc_adapter[card]->devicename);
			memcpy(mesgdata, &(sc_adapter[card]->async_msg),
			       sizeof(RspMessage));
			sc_adapter[card]->want_async_messages = 0;
			return 0;
		}

		tries++;
	}

	pr_debug("%s: SAR message timeout\n", sc_adapter[card]->devicename);
	sc_adapter[card]->want_async_messages = 0;
	return -ETIME;
}