1/* $Id: message.c,v 1.1.1.1 2007/08/03 18:52:36 Exp $
2 *
3 * functions for sending and receiving control messages
4 *
5 * Copyright (C) 1996  SpellCaster Telecommunications Inc.
6 *
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
9 *
10 * For more information, please contact gpl-info@spellcast.com or write:
11 *
12 *     SpellCaster Telecommunications Inc.
13 *     5621 Finch Avenue East, Unit #3
14 *     Scarborough, Ontario  Canada
15 *     M1B 2T9
16 *     +1 (416) 297-8565
17 *     +1 (416) 297-6433 Facsimile
18 */
19#include <linux/sched.h>
20#include "includes.h"
21#include "hardware.h"
22#include "message.h"
23#include "card.h"
24
25/*
26 * receive a message from the board
27 */
28int receivemessage(int card, RspMessage *rspmsg)
29{
30	DualPortMemory *dpm;
31	unsigned long flags;
32
33	if (!IS_VALID_CARD(card)) {
34		pr_debug("Invalid param: %d is not a valid card id\n", card);
35		return -EINVAL;
36	}
37
38	pr_debug("%s: Entered receivemessage\n",
39			sc_adapter[card]->devicename);
40
41	/*
42	 * See if there are messages waiting
43	 */
44	if (inb(sc_adapter[card]->ioport[FIFO_STATUS]) & RF_HAS_DATA) {
45		/*
46		 * Map in the DPM to the base page and copy the message
47		 */
48		spin_lock_irqsave(&sc_adapter[card]->lock, flags);
49		outb((sc_adapter[card]->shmem_magic >> 14) | 0x80,
50			sc_adapter[card]->ioport[sc_adapter[card]->shmem_pgport]);
51		dpm = (DualPortMemory *) sc_adapter[card]->rambase;
52		memcpy_fromio(rspmsg, &(dpm->rsp_queue[dpm->rsp_tail]),
53			MSG_LEN);
54		dpm->rsp_tail = (dpm->rsp_tail+1) % MAX_MESSAGES;
55		inb(sc_adapter[card]->ioport[FIFO_READ]);
56		spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
57		/*
58		 * Tell the board that the message is received
59		 */
60		pr_debug("%s: Received Message seq:%d pid:%d time:%d cmd:%d "
61				"cnt:%d (type,class,code):(%d,%d,%d) "
62				"link:%d stat:0x%x\n",
63					sc_adapter[card]->devicename,
64					rspmsg->sequence_no,
65					rspmsg->process_id,
66					rspmsg->time_stamp,
67					rspmsg->cmd_sequence_no,
68					rspmsg->msg_byte_cnt,
69					rspmsg->type,
70					rspmsg->class,
71					rspmsg->code,
72					rspmsg->phy_link_no,
73					rspmsg->rsp_status);
74
75		return 0;
76	}
77	return -ENOMSG;
78}
79
80/*
81 * send a message to the board
82 */
83int sendmessage(int card,
84		unsigned int procid,
85		unsigned int type,
86		unsigned int class,
87		unsigned int code,
88		unsigned int link,
89		unsigned int data_len,
90		unsigned int *data)
91{
92	DualPortMemory *dpm;
93	ReqMessage sndmsg;
94	unsigned long flags;
95
96	if (!IS_VALID_CARD(card)) {
97		pr_debug("Invalid param: %d is not a valid card id\n", card);
98		return -EINVAL;
99	}
100
101	/*
102	 * Make sure we only send CEPID messages when the engine is up
103	 * and CMPID messages when it is down
104	 */
105	if(sc_adapter[card]->EngineUp && procid == CMPID) {
106		pr_debug("%s: Attempt to send CM message with engine up\n",
107			sc_adapter[card]->devicename);
108		return -ESRCH;
109	}
110
111	if(!sc_adapter[card]->EngineUp && procid == CEPID) {
112		pr_debug("%s: Attempt to send CE message with engine down\n",
113			sc_adapter[card]->devicename);
114		return -ESRCH;
115	}
116
117	memset(&sndmsg, 0, MSG_LEN);
118	sndmsg.msg_byte_cnt = 4;
119	sndmsg.type = type;
120	sndmsg.class = class;
121	sndmsg.code = code;
122	sndmsg.phy_link_no = link;
123
124	if (data_len > 0) {
125		if (data_len > MSG_DATA_LEN)
126			data_len = MSG_DATA_LEN;
127		memcpy(&(sndmsg.msg_data), data, data_len);
128		sndmsg.msg_byte_cnt = data_len + 8;
129	}
130
131	sndmsg.process_id = procid;
132	sndmsg.sequence_no = sc_adapter[card]->seq_no++ % 256;
133
134	/*
135	 * wait for an empty slot in the queue
136	 */
137	while (!(inb(sc_adapter[card]->ioport[FIFO_STATUS]) & WF_NOT_FULL))
138		udelay(1);
139
140	/*
141	 * Disable interrupts and map in shared memory
142	 */
143	spin_lock_irqsave(&sc_adapter[card]->lock, flags);
144	outb((sc_adapter[card]->shmem_magic >> 14) | 0x80,
145		sc_adapter[card]->ioport[sc_adapter[card]->shmem_pgport]);
146	dpm = (DualPortMemory *) sc_adapter[card]->rambase;	/* Fix me */
147	memcpy_toio(&(dpm->req_queue[dpm->req_head]),&sndmsg,MSG_LEN);
148	dpm->req_head = (dpm->req_head+1) % MAX_MESSAGES;
149	outb(sndmsg.sequence_no, sc_adapter[card]->ioport[FIFO_WRITE]);
150	spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
151
152	pr_debug("%s: Sent Message seq:%d pid:%d time:%d "
153			"cnt:%d (type,class,code):(%d,%d,%d) "
154			"link:%d\n ",
155				sc_adapter[card]->devicename,
156				sndmsg.sequence_no,
157				sndmsg.process_id,
158				sndmsg.time_stamp,
159				sndmsg.msg_byte_cnt,
160				sndmsg.type,
161				sndmsg.class,
162				sndmsg.code,
163				sndmsg.phy_link_no);
164
165	return 0;
166}
167
168int send_and_receive(int card,
169		unsigned int procid,
170		unsigned char type,
171		unsigned char class,
172		unsigned char code,
173		unsigned char link,
174	 	unsigned char data_len,
175		unsigned char *data,
176		RspMessage *mesgdata,
177		int timeout)
178{
179	int retval;
180	int tries;
181
182	if (!IS_VALID_CARD(card)) {
183		pr_debug("Invalid param: %d is not a valid card id\n", card);
184		return -EINVAL;
185	}
186
187	sc_adapter[card]->want_async_messages = 1;
188	retval = sendmessage(card, procid, type, class, code, link,
189			data_len, (unsigned int *) data);
190
191	if (retval) {
192		pr_debug("%s: SendMessage failed in SAR\n",
193			sc_adapter[card]->devicename);
194		sc_adapter[card]->want_async_messages = 0;
195		return -EIO;
196	}
197
198	tries = 0;
199	/* wait for the response */
200	while (tries < timeout) {
201		schedule_timeout_interruptible(1);
202
203		pr_debug("SAR waiting..\n");
204
205		/*
206		 * See if we got our message back
207		 */
208		if ((sc_adapter[card]->async_msg.type == type) &&
209		    (sc_adapter[card]->async_msg.class == class) &&
210		    (sc_adapter[card]->async_msg.code == code) &&
211		    (sc_adapter[card]->async_msg.phy_link_no == link)) {
212
213			/*
214			 * Got it!
215			 */
216			pr_debug("%s: Got ASYNC message\n",
217				sc_adapter[card]->devicename);
218			memcpy(mesgdata, &(sc_adapter[card]->async_msg),
219				sizeof(RspMessage));
220			sc_adapter[card]->want_async_messages = 0;
221			return 0;
222		}
223
224   		tries++;
225	}
226
227	pr_debug("%s: SAR message timeout\n", sc_adapter[card]->devicename);
228	sc_adapter[card]->want_async_messages = 0;
229	return -ETIME;
230}
231